projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
printk/of_serial: fix serial console cessation part way through boot.
[deliverable/linux.git] / drivers / tty / vt / vt.c
CommitLineData
1da177e4 1/*
1da177e4
LT		 2 * Copyright (C) 1991, 1992 Linus Torvalds
3 */
4
5/*
6 * Hopefully this will be a rather complete VT102 implementation.
7 *
8 * Beeping thanks to John T Kohl.
9 *
10 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
11 * Chars, and VT100 enhancements by Peter MacDonald.
12 *
13 * Copy and paste function by Andrew Haylett,
14 * some enhancements by Alessandro Rubini.
15 *
16 * Code to check for different video-cards mostly by Galen Hunt,
17 * <g-hunt@ee.utah.edu>
18 *
19 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
20 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
21 *
22 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
23 * Resizing of consoles, aeb, 940926
24 *
25 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
26 * <poe@daimi.aau.dk>
27 *
28 * User-defined bell sound, new setterm control sequences and printk
29 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
30 *
31 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
32 *
33 * Merge with the abstract console driver by Geert Uytterhoeven
34 * <geert@linux-m68k.org>, Jan 1997.
35 *
36 * Original m68k console driver modifications by
37 *
38 * - Arno Griffioen <arno@usn.nl>
39 * - David Carter <carter@cs.bris.ac.uk>
40 *
41 * The abstract console driver provides a generic interface for a text
42 * console. It supports VGA text mode, frame buffer based graphical consoles
43 * and special graphics processors that are only accessible through some
44 * registers (e.g. a TMS340x0 GSP).
45 *
46 * The interface to the hardware is specified using a special structure
47 * (struct consw) which contains function pointers to console operations
48 * (see <linux/console.h> for more information).
49 *
50 * Support for changeable cursor shape
51 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
52 *
53 * Ported to i386 and con_scrolldelta fixed
54 * by Emmanuel Marty <core@ggi-project.org>, April 1998
55 *
56 * Resurrected character buffers in videoram plus lots of other trickery
57 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
58 *
59 * Removed old-style timers, introduced console_timer, made timer
e1f8e874 60 * deletion SMP-safe. 17Jun00, Andrew Morton
1da177e4
LT		 61 *
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
d4328b40
AT		 64 *
65 * Fixed UTF-8 mode so alternate charset modes always work according
66 * to control sequences interpreted in do_con_trol function
67 * preserving backward VT100 semigraphics compatibility,
68 * malformed UTF sequences represented as sequences of replacement glyphs,
69 * original codes or '?' as a last resort if replacement glyph is undefined
70 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
1da177e4
LT		 71 */
72
73#include <linux/module.h>
74#include <linux/types.h>
75#include <linux/sched.h>
76#include <linux/tty.h>
77#include <linux/tty_flip.h>
78#include <linux/kernel.h>
79#include <linux/string.h>
80#include <linux/errno.h>
81#include <linux/kd.h>
82#include <linux/slab.h>
83#include <linux/major.h>
84#include <linux/mm.h>
85#include <linux/console.h>
86#include <linux/init.h>
c831c338 87#include <linux/mutex.h>
1da177e4
LT		 88#include <linux/vt_kern.h>
89#include <linux/selection.h>
90#include <linux/tiocl.h>
91#include <linux/kbd_kern.h>
92#include <linux/consolemap.h>
93#include <linux/timer.h>
94#include <linux/interrupt.h>
1da177e4 95#include <linux/workqueue.h>
1da177e4
LT		 96#include <linux/pm.h>
97#include <linux/font.h>
98#include <linux/bitops.h>
b293d758 99#include <linux/notifier.h>
d81ed103
AC		 100#include <linux/device.h>
101#include <linux/io.h>
d81ed103 102#include <linux/uaccess.h>
81d44507 103#include <linux/kdb.h>
74c807ce 104#include <linux/ctype.h>
1da177e4 105
3e795de7 106#define MAX_NR_CON_DRIVER 16
1da177e4 107
6db4063c 108#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 109#define CON_DRIVER_FLAG_INIT 2
110#define CON_DRIVER_FLAG_ATTR 4
3e795de7
AD		 111
112struct con_driver {
113 const struct consw *con;
114 const char *desc;
805952a8 115 struct device *dev;
6db4063c 116 int node;
3e795de7
AD		 117 int first;
118 int last;
119 int flag;
120};
121
122static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 123const struct consw *conswitchp;
124
125/* A bitmap for codes <32. A bit of 1 indicates that the code
126 * corresponding to that bit number invokes some special action
127 * (such as cursor movement) and should not be displayed as a
128 * glyph unless the disp_ctrl mode is explicitly enabled.
129 */
130#define CTRL_ACTION 0x0d00ff81
131#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
132
133/*
134 * Here is the default bell parameters: 750HZ, 1/8th of a second
135 */
136#define DEFAULT_BELL_PITCH 750
137#define DEFAULT_BELL_DURATION (HZ/8)
138
1da177e4
LT		 139struct vc vc_cons [MAX_NR_CONSOLES];
140
141#ifndef VT_SINGLE_DRIVER
142static const struct consw *con_driver_map[MAX_NR_CONSOLES];
143#endif
144
145static int con_open(struct tty_struct *, struct file *);
146static void vc_init(struct vc_data *vc, unsigned int rows,
147 unsigned int cols, int do_clear);
148static void gotoxy(struct vc_data *vc, int new_x, int new_y);
149static void save_cur(struct vc_data *vc);
150static void reset_terminal(struct vc_data *vc, int do_clear);
151static void con_flush_chars(struct tty_struct *tty);
403aac96 152static int set_vesa_blanking(char __user *p);
1da177e4
LT		 153static void set_cursor(struct vc_data *vc);
154static void hide_cursor(struct vc_data *vc);
65f27f38 155static void console_callback(struct work_struct *ignored);
1da177e4
LT		 156static void blank_screen_t(unsigned long dummy);
157static void set_palette(struct vc_data *vc);
158
159static int printable; /* Is console ready for printing? */
77bf2bab 160int default_utf8 = true;
042f10ec 161module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 162int global_cursor_default = -1;
163module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 164
9ea9a886
CL		 165static int cur_default = CUR_DEFAULT;
166module_param(cur_default, int, S_IRUGO | S_IWUSR);
167
1da177e4
LT		 168/*
169 * ignore_poke: don't unblank the screen when things are typed. This is
170 * mainly for the privacy of braille terminal users.
171 */
172static int ignore_poke;
173
174int do_poke_blanked_console;
175int console_blanked;
176
177static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 178static int vesa_off_interval;
f324edc8
DM		 179static int blankinterval = 10*60;
180core_param(consoleblank, blankinterval, int, 0444);
1da177e4 181
65f27f38 182static DECLARE_WORK(console_work, console_callback);
1da177e4
LT		 183
184/*
185 * fg_console is the current virtual console,
186 * last_console is the last used one,
187 * want_console is the console we want to switch to,
b45cfba4 188 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 189 */
190int fg_console;
191int last_console;
192int want_console = -1;
fed891c8
JW		 193static int saved_fg_console;
194static int saved_last_console;
195static int saved_want_console;
196static int saved_vc_mode;
beed5336 197static int saved_console_blanked;
1da177e4
LT		 198
199/*
200 * For each existing display, we have a pointer to console currently visible
201 * on that display, allowing consoles other than fg_console to be refreshed
202 * appropriately. Unless the low-level driver supplies its own display_fg
203 * variable, we use this one for the "master display".
204 */
205static struct vc_data *master_display_fg;
206
207/*
208 * Unfortunately, we need to delay tty echo when we're currently writing to the
209 * console since the code is (and always was) not re-entrant, so we schedule
210 * all flip requests to process context with schedule-task() and run it from
211 * console_callback().
212 */
213
214/*
215 * For the same reason, we defer scrollback to the console callback.
216 */
217static int scrollback_delta;
218
219/*
220 * Hook so that the power management routines can (un)blank
221 * the console on our behalf.
222 */
223int (*console_blank_hook)(int);
224
40565f19 225static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
1da177e4
LT		 226static int blank_state;
227static int blank_timer_expired;
228enum {
229 blank_off = 0,
230 blank_normal_wait,
231 blank_vesa_wait,
232};
233
fbc92a34
KS		 234/*
235 * /sys/class/tty/tty0/
236 *
237 * the attribute 'active' contains the name of the current vc
238 * console and it supports poll() to detect vc switches
239 */
240static struct device *tty0dev;
241
b293d758
ST		 242/*
243 * Notifier list for console events.
244 */
245static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
246
247int register_vt_notifier(struct notifier_block *nb)
248{
249 return atomic_notifier_chain_register(&vt_notifier_list, nb);
250}
251EXPORT_SYMBOL_GPL(register_vt_notifier);
252
253int unregister_vt_notifier(struct notifier_block *nb)
254{
255 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
256}
257EXPORT_SYMBOL_GPL(unregister_vt_notifier);
258
259static void notify_write(struct vc_data *vc, unsigned int unicode)
260{
502fcb79 261 struct vt_notifier_param param = { .vc = vc, .c = unicode };
b293d758
ST		 262 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
263}
264
265static void notify_update(struct vc_data *vc)
266{
267 struct vt_notifier_param param = { .vc = vc };
268 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
269}
1da177e4
LT		 270/*
271 * Low-Level Functions
272 */
273
274#define IS_FG(vc) ((vc)->vc_num == fg_console)
275
276#ifdef VT_BUF_VRAM_ONLY
277#define DO_UPDATE(vc) 0
278#else
f700d6e5 279#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
1da177e4
LT		 280#endif
281
282static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
283{
284 unsigned short *p;
285
286 if (!viewed)
287 p = (unsigned short *)(vc->vc_origin + offset);
288 else if (!vc->vc_sw->con_screen_pos)
289 p = (unsigned short *)(vc->vc_visible_origin + offset);
290 else
291 p = vc->vc_sw->con_screen_pos(vc, offset);
292 return p;
293}
294
e33ac1c1 295/* Called from the keyboard irq path.. */
1da177e4
LT		 296static inline void scrolldelta(int lines)
297{
e33ac1c1
AC		 298 /* FIXME */
299 /* scrolldelta needs some kind of consistency lock, but the BKL was
300 and still is not protecting versus the scheduled back end */
1da177e4
LT		 301 scrollback_delta += lines;
302 schedule_console_callback();
303}
304
305void schedule_console_callback(void)
306{
307 schedule_work(&console_work);
308}
309
310static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
311{
312 unsigned short *d, *s;
313
314 if (t+nr >= b)
315 nr = b - t - 1;
316 if (b > vc->vc_rows || t >= b || nr < 1)
317 return;
318 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
319 return;
320 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
321 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
322 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
386f40c8 323 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
1da177e4
LT		 324 vc->vc_size_row * nr);
325}
326
327static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
328{
329 unsigned short *s;
330 unsigned int step;
331
332 if (t+nr >= b)
333 nr = b - t - 1;
334 if (b > vc->vc_rows || t >= b || nr < 1)
335 return;
336 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
337 return;
338 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
339 step = vc->vc_cols * nr;
340 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
93f78da4 341 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
1da177e4
LT		 342}
343
344static void do_update_region(struct vc_data *vc, unsigned long start, int count)
345{
346#ifndef VT_BUF_VRAM_ONLY
347 unsigned int xx, yy, offset;
348 u16 *p;
349
350 p = (u16 *) start;
351 if (!vc->vc_sw->con_getxy) {
352 offset = (start - vc->vc_origin) / 2;
353 xx = offset % vc->vc_cols;
354 yy = offset / vc->vc_cols;
355 } else {
356 int nxx, nyy;
357 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
358 xx = nxx; yy = nyy;
359 }
360 for(;;) {
361 u16 attrib = scr_readw(p) & 0xff00;
362 int startx = xx;
363 u16 *q = p;
364 while (xx < vc->vc_cols && count) {
365 if (attrib != (scr_readw(p) & 0xff00)) {
366 if (p > q)
367 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
368 startx = xx;
369 q = p;
370 attrib = scr_readw(p) & 0xff00;
371 }
372 p++;
373 xx++;
374 count--;
375 }
376 if (p > q)
377 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
378 if (!count)
379 break;
380 xx = 0;
381 yy++;
382 if (vc->vc_sw->con_getxy) {
383 p = (u16 *)start;
384 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
385 }
386 }
387#endif
388}
389
390void update_region(struct vc_data *vc, unsigned long start, int count)
391{
392 WARN_CONSOLE_UNLOCKED();
393
394 if (DO_UPDATE(vc)) {
395 hide_cursor(vc);
396 do_update_region(vc, start, count);
397 set_cursor(vc);
398 }
399}
400
401/* Structure of attributes is hardware-dependent */
402
fa6ce9ab
JE		 403static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
404 u8 _underline, u8 _reverse, u8 _italic)
1da177e4
LT		 405{
406 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 407 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
408 _blink, _underline, _reverse, _italic);
1da177e4
LT		 409
410#ifndef VT_BUF_VRAM_ONLY
411/*
412 * ++roman: I completely changed the attribute format for monochrome
413 * mode (!can_do_color). The formerly used MDA (monochrome display
414 * adapter) format didn't allow the combination of certain effects.
415 * Now the attribute is just a bit vector:
416 * Bit 0..1: intensity (0..2)
417 * Bit 2 : underline
418 * Bit 3 : reverse
419 * Bit 7 : blink
420 */
421 {
c9e587ab 422 u8 a = _color;
1da177e4
LT		 423 if (!vc->vc_can_do_color)
424 return _intensity |
fa6ce9ab 425 (_italic ? 2 : 0) |
1da177e4
LT		 426 (_underline ? 4 : 0) |
427 (_reverse ? 8 : 0) |
428 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 429 if (_italic)
430 a = (a & 0xF0) | vc->vc_itcolor;
431 else if (_underline)
1da177e4
LT		 432 a = (a & 0xf0) | vc->vc_ulcolor;
433 else if (_intensity == 0)
434 a = (a & 0xf0) | vc->vc_ulcolor;
435 if (_reverse)
436 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
437 if (_blink)
438 a ^= 0x80;
439 if (_intensity == 2)
440 a ^= 0x08;
441 if (vc->vc_hi_font_mask == 0x100)
442 a <<= 1;
443 return a;
444 }
445#else
446 return 0;
447#endif
448}
449
450static void update_attr(struct vc_data *vc)
451{
fa6ce9ab
JE		 452 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
453 vc->vc_blink, vc->vc_underline,
454 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
455 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 456}
457
458/* Note: inverting the screen twice should revert to the original state */
459void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
460{
461 unsigned short *p;
462
463 WARN_CONSOLE_UNLOCKED();
464
465 count /= 2;
466 p = screenpos(vc, offset, viewed);
467 if (vc->vc_sw->con_invert_region)
468 vc->vc_sw->con_invert_region(vc, p, count);
469#ifndef VT_BUF_VRAM_ONLY
470 else {
471 u16 *q = p;
472 int cnt = count;
473 u16 a;
474
475 if (!vc->vc_can_do_color) {
476 while (cnt--) {
477 a = scr_readw(q);
478 a ^= 0x0800;
479 scr_writew(a, q);
480 q++;
481 }
482 } else if (vc->vc_hi_font_mask == 0x100) {
483 while (cnt--) {
484 a = scr_readw(q);
485 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
486 scr_writew(a, q);
487 q++;
488 }
489 } else {
490 while (cnt--) {
491 a = scr_readw(q);
492 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
493 scr_writew(a, q);
494 q++;
495 }
496 }
497 }
498#endif
499 if (DO_UPDATE(vc))
500 do_update_region(vc, (unsigned long) p, count);
501}
502
503/* used by selection: complement pointer position */
504void complement_pos(struct vc_data *vc, int offset)
505{
414edcd3 506 static int old_offset = -1;
1da177e4
LT		 507 static unsigned short old;
508 static unsigned short oldx, oldy;
509
510 WARN_CONSOLE_UNLOCKED();
511
414edcd3
AD		 512 if (old_offset != -1 && old_offset >= 0 &&
513 old_offset < vc->vc_screenbuf_size) {
514 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 515 if (DO_UPDATE(vc))
516 vc->vc_sw->con_putc(vc, old, oldy, oldx);
517 }
414edcd3
AD		 518
519 old_offset = offset;
520
521 if (offset != -1 && offset >= 0 &&
522 offset < vc->vc_screenbuf_size) {
1da177e4 523 unsigned short new;
414edcd3 524 unsigned short *p;
1da177e4
LT		 525 p = screenpos(vc, offset, 1);
526 old = scr_readw(p);
527 new = old ^ vc->vc_complement_mask;
528 scr_writew(new, p);
529 if (DO_UPDATE(vc)) {
530 oldx = (offset >> 1) % vc->vc_cols;
531 oldy = (offset >> 1) / vc->vc_cols;
532 vc->vc_sw->con_putc(vc, new, oldy, oldx);
533 }
534 }
414edcd3 535
1da177e4
LT		 536}
537
538static void insert_char(struct vc_data *vc, unsigned int nr)
539{
81732c3b 540 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 541
a883b70d 542 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b 543 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
1da177e4 544 vc->vc_need_wrap = 0;
81732c3b
JFM		 545 if (DO_UPDATE(vc))
546 do_update_region(vc, (unsigned long) p,
b1a925f4 547 vc->vc_cols - vc->vc_x);
1da177e4
LT		 548}
549
550static void delete_char(struct vc_data *vc, unsigned int nr)
551{
81732c3b 552 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 553
b1a925f4 554 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b
JFM		 555 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
556 nr * 2);
1da177e4 557 vc->vc_need_wrap = 0;
81732c3b
JFM		 558 if (DO_UPDATE(vc))
559 do_update_region(vc, (unsigned long) p,
b1a925f4 560 vc->vc_cols - vc->vc_x);
1da177e4
LT		 561}
562
563static int softcursor_original;
564
565static void add_softcursor(struct vc_data *vc)
566{
567 int i = scr_readw((u16 *) vc->vc_pos);
568 u32 type = vc->vc_cursor_type;
569
570 if (! (type & 0x10)) return;
571 if (softcursor_original != -1) return;
572 softcursor_original = i;
573 i |= ((type >> 8) & 0xff00 );
574 i ^= ((type) & 0xff00 );
575 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
576 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
577 scr_writew(i, (u16 *) vc->vc_pos);
578 if (DO_UPDATE(vc))
579 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
580}
581
582static void hide_softcursor(struct vc_data *vc)
583{
584 if (softcursor_original != -1) {
585 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
586 if (DO_UPDATE(vc))
587 vc->vc_sw->con_putc(vc, softcursor_original,
588 vc->vc_y, vc->vc_x);
589 softcursor_original = -1;
590 }
591}
592
593static void hide_cursor(struct vc_data *vc)
594{
595 if (vc == sel_cons)
596 clear_selection();
597 vc->vc_sw->con_cursor(vc, CM_ERASE);
598 hide_softcursor(vc);
599}
600
601static void set_cursor(struct vc_data *vc)
602{
603 if (!IS_FG(vc) || console_blanked ||
604 vc->vc_mode == KD_GRAPHICS)
605 return;
606 if (vc->vc_deccm) {
607 if (vc == sel_cons)
608 clear_selection();
609 add_softcursor(vc);
610 if ((vc->vc_cursor_type & 0x0f) != 1)
611 vc->vc_sw->con_cursor(vc, CM_DRAW);
612 } else
613 hide_cursor(vc);
614}
615
616static void set_origin(struct vc_data *vc)
617{
618 WARN_CONSOLE_UNLOCKED();
619
620 if (!CON_IS_VISIBLE(vc) ||
621 !vc->vc_sw->con_set_origin ||
622 !vc->vc_sw->con_set_origin(vc))
623 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
624 vc->vc_visible_origin = vc->vc_origin;
625 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
626 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
627}
628
629static inline void save_screen(struct vc_data *vc)
630{
631 WARN_CONSOLE_UNLOCKED();
632
633 if (vc->vc_sw->con_save_screen)
634 vc->vc_sw->con_save_screen(vc);
635}
636
637/*
638 * Redrawing of screen
639 */
640
2a248307 641void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 642{
643 unsigned short *p = (unsigned short *)vc->vc_origin;
644 int count = vc->vc_screenbuf_size / 2;
645 int mask = vc->vc_hi_font_mask | 0xff;
646
647 for (; count > 0; count--, p++) {
648 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
649 }
650}
651
652void redraw_screen(struct vc_data *vc, int is_switch)
653{
654 int redraw = 0;
655
656 WARN_CONSOLE_UNLOCKED();
657
658 if (!vc) {
659 /* strange ... */
660 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
661 return;
662 }
663
664 if (is_switch) {
665 struct vc_data *old_vc = vc_cons[fg_console].d;
666 if (old_vc == vc)
667 return;
668 if (!CON_IS_VISIBLE(vc))
669 redraw = 1;
670 *vc->vc_display_fg = vc;
671 fg_console = vc->vc_num;
672 hide_cursor(old_vc);
673 if (!CON_IS_VISIBLE(old_vc)) {
674 save_screen(old_vc);
675 set_origin(old_vc);
676 }
fbc92a34
KS		 677 if (tty0dev)
678 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 679 } else {
680 hide_cursor(vc);
681 redraw = 1;
682 }
683
684 if (redraw) {
685 int update;
686 int old_was_color = vc->vc_can_do_color;
687
688 set_origin(vc);
689 update = vc->vc_sw->con_switch(vc);
690 set_palette(vc);
691 /*
692 * If console changed from mono<->color, the best we can do
693 * is to clear the buffer attributes. As it currently stands,
694 * rebuilding new attributes from the old buffer is not doable
695 * without overly complex code.
696 */
697 if (old_was_color != vc->vc_can_do_color) {
698 update_attr(vc);
699 clear_buffer_attributes(vc);
700 }
8fd4bd22
JB		 701
702 /* Forcibly update if we're panicing */
703 if ((update && vc->vc_mode != KD_GRAPHICS) ||
704 vt_force_oops_output(vc))
1da177e4
LT		 705 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
706 }
707 set_cursor(vc);
708 if (is_switch) {
709 set_leds();
710 compute_shiftstate();
8182ec49 711 notify_update(vc);
1da177e4
LT		 712 }
713}
714
715/*
716 * Allocation, freeing and resizing of VTs.
717 */
718
719int vc_cons_allocated(unsigned int i)
720{
721 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
722}
723
724static void visual_init(struct vc_data *vc, int num, int init)
725{
726 /* ++Geert: vc->vc_sw->con_init determines console size */
727 if (vc->vc_sw)
728 module_put(vc->vc_sw->owner);
729 vc->vc_sw = conswitchp;
730#ifndef VT_SINGLE_DRIVER
731 if (con_driver_map[num])
732 vc->vc_sw = con_driver_map[num];
733#endif
734 __module_get(vc->vc_sw->owner);
735 vc->vc_num = num;
736 vc->vc_display_fg = &master_display_fg;
737 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
738 vc->vc_uni_pagedir = 0;
739 vc->vc_hi_font_mask = 0;
740 vc->vc_complement_mask = 0;
741 vc->vc_can_do_color = 0;
8fd4bd22 742 vc->vc_panic_force_write = false;
1da177e4
LT		 743 vc->vc_sw->con_init(vc, init);
744 if (!vc->vc_complement_mask)
745 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
746 vc->vc_s_complement_mask = vc->vc_complement_mask;
747 vc->vc_size_row = vc->vc_cols << 1;
748 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
749}
750
751int vc_allocate(unsigned int currcons) /* return 0 on success */
752{
753 WARN_CONSOLE_UNLOCKED();
754
755 if (currcons >= MAX_NR_CONSOLES)
756 return -ENXIO;
757 if (!vc_cons[currcons].d) {
758 struct vc_data *vc;
b293d758 759 struct vt_notifier_param param;
1da177e4
LT		 760
761 /* prevent users from taking too much memory */
762 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
763 return -EPERM;
764
765 /* due to the granularity of kmalloc, we waste some memory here */
766 /* the alloc is done in two steps, to optimize the common situation
767 of a 25x80 console (structsize=216, screenbuf_size=4000) */
768 /* although the numbers above are not valid since long ago, the
769 point is still up-to-date and the comment still has its value
770 even if only as a historical artifact. --mj, July 1998 */
b293d758 771 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1da177e4
LT		 772 if (!vc)
773 return -ENOMEM;
1da177e4 774 vc_cons[currcons].d = vc;
ff917ba4 775 tty_port_init(&vc->port);
c2c88f10 776 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 777 visual_init(vc, currcons, 1);
778 if (!*vc->vc_uni_pagedir_loc)
779 con_set_default_unimap(vc);
5c9228f0 780 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1da177e4
LT		 781 if (!vc->vc_screenbuf) {
782 kfree(vc);
783 vc_cons[currcons].d = NULL;
784 return -ENOMEM;
785 }
f6c06b68
MG		 786
787 /* If no drivers have overridden us and the user didn't pass a
788 boot option, default to displaying the cursor */
789 if (global_cursor_default == -1)
790 global_cursor_default = 1;
791
1da177e4 792 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
4995f8ef 793 vcs_make_sysfs(currcons);
b293d758 794 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1da177e4
LT		 795 }
796 return 0;
797}
798
e400b6ec
AD		 799static inline int resize_screen(struct vc_data *vc, int width, int height,
800 int user)
1da177e4
LT		 801{
802 /* Resizes the resolution of the display adapater */
803 int err = 0;
804
805 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 806 err = vc->vc_sw->con_resize(vc, width, height, user);
807
1da177e4
LT		 808 return err;
809}
810
811/*
812 * Change # of rows and columns (0 means unchanged/the size of fg_console)
813 * [this is to be used together with some user program
814 * like resize that changes the hardware videomode]
815 */
816#define VC_RESIZE_MAXCOL (32767)
817#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 818
819/**
820 * vc_do_resize - resizing method for the tty
821 * @tty: tty being resized
822 * @real_tty: real tty (different to tty if a pty/tty pair)
823 * @vc: virtual console private data
824 * @cols: columns
825 * @lines: lines
826 *
827 * Resize a virtual console, clipping according to the actual constraints.
828 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 829 * information and perform any necessary signal handling.
8c9a9dd0 830 *
6a1c0680 831 * Caller must hold the console semaphore. Takes the termios rwsem and
8c9a9dd0
AC		 832 * ctrl_lock of the tty IFF a tty is passed.
833 */
834
fc6f6238
AC		 835static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
836 unsigned int cols, unsigned int lines)
1da177e4
LT		 837{
838 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 839 unsigned long end;
f2ee4ae8 840 unsigned int old_rows, old_row_size;
1da177e4 841 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 842 unsigned int user;
1da177e4
LT		 843 unsigned short *newscreen;
844
845 WARN_CONSOLE_UNLOCKED();
846
847 if (!vc)
848 return -ENXIO;
849
e400b6ec
AD		 850 user = vc->vc_resize_user;
851 vc->vc_resize_user = 0;
852
1da177e4
LT		 853 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
854 return -EINVAL;
855
856 new_cols = (cols ? cols : vc->vc_cols);
857 new_rows = (lines ? lines : vc->vc_rows);
858 new_row_size = new_cols << 1;
859 new_screen_size = new_row_size * new_rows;
860
861 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
862 return 0;
863
5cbded58 864 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 865 if (!newscreen)
866 return -ENOMEM;
867
868 old_rows = vc->vc_rows;
1da177e4 869 old_row_size = vc->vc_size_row;
1da177e4 870
e400b6ec 871 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 872 if (err) {
873 kfree(newscreen);
874 return err;
875 }
876
877 vc->vc_rows = new_rows;
878 vc->vc_cols = new_cols;
879 vc->vc_size_row = new_row_size;
880 vc->vc_screenbuf_size = new_screen_size;
881
882 rlth = min(old_row_size, new_row_size);
883 rrem = new_row_size - rlth;
884 old_origin = vc->vc_origin;
885 new_origin = (long) newscreen;
886 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 887
888 if (vc->vc_y > new_rows) {
889 if (old_rows - vc->vc_y < new_rows) {
890 /*
891 * Cursor near the bottom, copy contents from the
892 * bottom of buffer
893 */
894 old_origin += (old_rows - new_rows) * old_row_size;
3b41dc1a
AD		 895 } else {
896 /*
897 * Cursor is in no man's land, copy 1/2 screenful
898 * from the top and bottom of cursor position
899 */
900 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
3b41dc1a 901 }
9fc2b2d0
FJ		 902 }
903
904 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4
LT		 905
906 update_attr(vc);
907
3b41dc1a
AD		 908 while (old_origin < end) {
909 scr_memcpyw((unsigned short *) new_origin,
910 (unsigned short *) old_origin, rlth);
1da177e4 911 if (rrem)
3b41dc1a
AD		 912 scr_memsetw((void *)(new_origin + rlth),
913 vc->vc_video_erase_char, rrem);
1da177e4
LT		 914 old_origin += old_row_size;
915 new_origin += new_row_size;
916 }
917 if (new_scr_end > new_origin)
3b41dc1a
AD		 918 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
919 new_scr_end - new_origin);
5c9228f0 920 kfree(vc->vc_screenbuf);
1da177e4 921 vc->vc_screenbuf = newscreen;
1da177e4
LT		 922 vc->vc_screenbuf_size = new_screen_size;
923 set_origin(vc);
924
925 /* do part of a reset_terminal() */
926 vc->vc_top = 0;
927 vc->vc_bottom = vc->vc_rows;
928 gotoxy(vc, vc->vc_x, vc->vc_y);
929 save_cur(vc);
930
8c9a9dd0
AC		 931 if (tty) {
932 /* Rewrite the requested winsize data with the actual
933 resulting sizes */
934 struct winsize ws;
1da177e4
LT		 935 memset(&ws, 0, sizeof(ws));
936 ws.ws_row = vc->vc_rows;
937 ws.ws_col = vc->vc_cols;
938 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 939 tty_do_resize(tty, &ws);
1da177e4
LT		 940 }
941
942 if (CON_IS_VISIBLE(vc))
943 update_screen(vc);
8b92e87d 944 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 945 return err;
946}
947
8c9a9dd0
AC		 948/**
949 * vc_resize - resize a VT
950 * @vc: virtual console
951 * @cols: columns
952 * @rows: rows
953 *
954 * Resize a virtual console as seen from the console end of things. We
955 * use the common vc_do_resize methods to update the structures. The
956 * caller must hold the console sem to protect console internals and
8ce73264 957 * vc->port.tty
8c9a9dd0
AC		 958 */
959
960int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
961{
8ce73264 962 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 963}
964
965/**
966 * vt_resize - resize a VT
967 * @tty: tty to resize
8c9a9dd0
AC		 968 * @ws: winsize attributes
969 *
970 * Resize a virtual terminal. This is called by the tty layer as we
971 * register our own handler for resizing. The mutual helper does all
972 * the actual work.
973 *
974 * Takes the console sem and the called methods then take the tty
6a1c0680 975 * termios_rwsem and the tty ctrl_lock in that order.
8c9a9dd0 976 */
da2bdf9a 977static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 978{
8c9a9dd0
AC		 979 struct vc_data *vc = tty->driver_data;
980 int ret;
ca9bda00 981
ac751efa 982 console_lock();
fc6f6238 983 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 984 console_unlock();
8c9a9dd0 985 return ret;
ca9bda00 986}
1da177e4 987
421b40a6 988struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 989{
421b40a6
PH		 990 struct vc_data *vc = NULL;
991
1da177e4
LT		 992 WARN_CONSOLE_UNLOCKED();
993
994 if (vc_cons_allocated(currcons)) {
421b40a6 995 struct vt_notifier_param param;
4995f8ef 996
421b40a6 997 param.vc = vc = vc_cons[currcons].d;
b293d758 998 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 999 vcs_remove_sysfs(currcons);
1da177e4 1000 vc->vc_sw->con_deinit(vc);
bde0d2c9 1001 put_pid(vc->vt_pid);
d459ec0b 1002 module_put(vc->vc_sw->owner);
5c9228f0 1003 kfree(vc->vc_screenbuf);
1da177e4
LT		 1004 vc_cons[currcons].d = NULL;
1005 }
421b40a6 1006 return vc;
1da177e4
LT		 1007}
1008
1009/*
1010 * VT102 emulator
1011 */
1012
079c9534
AC		 1013#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1014#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1015#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1016
1017#define decarm VC_REPEAT
1018#define decckm VC_CKMODE
1019#define kbdapplic VC_APPLIC
1020#define lnm VC_CRLF
1021
1022/*
1023 * this is what the terminal answers to a ESC-Z or csi0c query.
1024 */
1025#define VT100ID "\033[?1;2c"
1026#define VT102ID "\033[?6c"
1027
1028unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1029 8,12,10,14, 9,13,11,15 };
1030
1031/* the default colour table, for VGA+ colour systems */
1032int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1033 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1034int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1035 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1036int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1037 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1038
1c2bbe6a
JE		 1039module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1040module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1041module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1042
1da177e4
LT		 1043/*
1044 * gotoxy() must verify all boundaries, because the arguments
1045 * might also be negative. If the given position is out of
1046 * bounds, the cursor is placed at the nearest margin.
1047 */
1048static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1049{
1050 int min_y, max_y;
1051
1052 if (new_x < 0)
1053 vc->vc_x = 0;
1054 else {
1055 if (new_x >= vc->vc_cols)
1056 vc->vc_x = vc->vc_cols - 1;
1057 else
1058 vc->vc_x = new_x;
1059 }
1060
1061 if (vc->vc_decom) {
1062 min_y = vc->vc_top;
1063 max_y = vc->vc_bottom;
1064 } else {
1065 min_y = 0;
1066 max_y = vc->vc_rows;
1067 }
1068 if (new_y < min_y)
1069 vc->vc_y = min_y;
1070 else if (new_y >= max_y)
1071 vc->vc_y = max_y - 1;
1072 else
1073 vc->vc_y = new_y;
1074 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1075 vc->vc_need_wrap = 0;
1076}
1077
1078/* for absolute user moves, when decom is set */
1079static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1080{
1081 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1082}
1083
1084void scrollback(struct vc_data *vc, int lines)
1085{
1086 if (!lines)
1087 lines = vc->vc_rows / 2;
1088 scrolldelta(-lines);
1089}
1090
1091void scrollfront(struct vc_data *vc, int lines)
1092{
1093 if (!lines)
1094 lines = vc->vc_rows / 2;
1095 scrolldelta(lines);
1096}
1097
1098static void lf(struct vc_data *vc)
1099{
1100 /* don't scroll if above bottom of scrolling region, or
1101 * if below scrolling region
1102 */
1103 if (vc->vc_y + 1 == vc->vc_bottom)
1104 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1105 else if (vc->vc_y < vc->vc_rows - 1) {
1106 vc->vc_y++;
1107 vc->vc_pos += vc->vc_size_row;
1108 }
1109 vc->vc_need_wrap = 0;
b293d758 1110 notify_write(vc, '\n');
1da177e4
LT		 1111}
1112
1113static void ri(struct vc_data *vc)
1114{
1115 /* don't scroll if below top of scrolling region, or
1116 * if above scrolling region
1117 */
1118 if (vc->vc_y == vc->vc_top)
1119 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1120 else if (vc->vc_y > 0) {
1121 vc->vc_y--;
1122 vc->vc_pos -= vc->vc_size_row;
1123 }
1124 vc->vc_need_wrap = 0;
1125}
1126
1127static inline void cr(struct vc_data *vc)
1128{
1129 vc->vc_pos -= vc->vc_x << 1;
1130 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1131 notify_write(vc, '\r');
1da177e4
LT		 1132}
1133
1134static inline void bs(struct vc_data *vc)
1135{
1136 if (vc->vc_x) {
1137 vc->vc_pos -= 2;
1138 vc->vc_x--;
1139 vc->vc_need_wrap = 0;
b293d758 1140 notify_write(vc, '\b');
1da177e4
LT		 1141 }
1142}
1143
1144static inline void del(struct vc_data *vc)
1145{
1146 /* ignored */
1147}
1148
1149static void csi_J(struct vc_data *vc, int vpar)
1150{
1151 unsigned int count;
1152 unsigned short * start;
1153
1154 switch (vpar) {
1155 case 0: /* erase from cursor to end of display */
1156 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1157 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1158 break;
1159 case 1: /* erase from start to cursor */
1160 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1161 start = (unsigned short *)vc->vc_origin;
1da177e4 1162 break;
f8df13e0
PP		 1163 case 3: /* erase scroll-back buffer (and whole display) */
1164 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1165 vc->vc_screenbuf_size >> 1);
1166 set_origin(vc);
0930b095
PP		 1167 if (CON_IS_VISIBLE(vc))
1168 update_screen(vc);
f8df13e0 1169 /* fall through */
1da177e4
LT		 1170 case 2: /* erase whole display */
1171 count = vc->vc_cols * vc->vc_rows;
1172 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1173 break;
1174 default:
1175 return;
1176 }
1177 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
81732c3b
JFM		 1178 if (DO_UPDATE(vc))
1179 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1180 vc->vc_need_wrap = 0;
1181}
1182
1183static void csi_K(struct vc_data *vc, int vpar)
1184{
1185 unsigned int count;
1186 unsigned short * start;
1187
1188 switch (vpar) {
1189 case 0: /* erase from cursor to end of line */
1190 count = vc->vc_cols - vc->vc_x;
1191 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1192 break;
1193 case 1: /* erase from start of line to cursor */
1194 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1195 count = vc->vc_x + 1;
1da177e4
LT		 1196 break;
1197 case 2: /* erase whole line */
1198 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1199 count = vc->vc_cols;
1da177e4
LT		 1200 break;
1201 default:
1202 return;
1203 }
1204 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1205 vc->vc_need_wrap = 0;
81732c3b
JFM		 1206 if (DO_UPDATE(vc))
1207 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1208}
1209
1210static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1211{ /* not vt100? */
1212 int count;
1213
1214 if (!vpar)
1215 vpar++;
1216 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1217
1218 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1219 if (DO_UPDATE(vc))
1220 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1221 vc->vc_need_wrap = 0;
1222}
1223
1224static void default_attr(struct vc_data *vc)
1225{
1226 vc->vc_intensity = 1;
fa6ce9ab 1227 vc->vc_italic = 0;
1da177e4
LT		 1228 vc->vc_underline = 0;
1229 vc->vc_reverse = 0;
1230 vc->vc_blink = 0;
1231 vc->vc_color = vc->vc_def_color;
1232}
1233
ac751efa 1234/* console_lock is held */
1da177e4
LT		 1235static void csi_m(struct vc_data *vc)
1236{
1237 int i;
1238
1239 for (i = 0; i <= vc->vc_npar; i++)
1240 switch (vc->vc_par[i]) {
1241 case 0: /* all attributes off */
1242 default_attr(vc);
1243 break;
1244 case 1:
1245 vc->vc_intensity = 2;
1246 break;
1247 case 2:
1248 vc->vc_intensity = 0;
1249 break;
fa6ce9ab
JE		 1250 case 3:
1251 vc->vc_italic = 1;
1252 break;
1da177e4
LT		 1253 case 4:
1254 vc->vc_underline = 1;
1255 break;
1256 case 5:
1257 vc->vc_blink = 1;
1258 break;
1259 case 7:
1260 vc->vc_reverse = 1;
1261 break;
1262 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1263 * Select primary font, don't display
1264 * control chars if defined, don't set
1265 * bit 8 on output.
1266 */
1267 vc->vc_translate = set_translate(vc->vc_charset == 0
1268 ? vc->vc_G0_charset
1269 : vc->vc_G1_charset, vc);
1270 vc->vc_disp_ctrl = 0;
1271 vc->vc_toggle_meta = 0;
1272 break;
1273 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1274 * Select first alternate font, lets
1275 * chars < 32 be displayed as ROM chars.
1276 */
1277 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1278 vc->vc_disp_ctrl = 1;
1279 vc->vc_toggle_meta = 0;
1280 break;
1281 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1282 * Select second alternate font, toggle
1283 * high bit before displaying as ROM char.
1284 */
1285 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1286 vc->vc_disp_ctrl = 1;
1287 vc->vc_toggle_meta = 1;
1288 break;
1289 case 21:
1290 case 22:
1291 vc->vc_intensity = 1;
1292 break;
fa6ce9ab
JE		 1293 case 23:
1294 vc->vc_italic = 0;
1295 break;
1da177e4
LT		 1296 case 24:
1297 vc->vc_underline = 0;
1298 break;
1299 case 25:
1300 vc->vc_blink = 0;
1301 break;
1302 case 27:
1303 vc->vc_reverse = 0;
1304 break;
3415097f
AB		 1305 case 38:
1306 case 48: /* ITU T.416
1307 * Higher colour modes.
1308 * They break the usual properties of SGR codes
1309 * and thus need to be detected and ignored by
1310 * hand. Strictly speaking, that standard also
1311 * wants : rather than ; as separators, contrary
1312 * to ECMA-48, but no one produces such codes
1313 * and almost no one accepts them.
1314 */
1315 i++;
1316 if (i > vc->vc_npar)
1317 break;
1318 if (vc->vc_par[i] == 5) /* 256 colours */
1319 i++; /* ubiquitous */
1320 else if (vc->vc_par[i] == 2) /* 24 bit colours */
1321 i += 3; /* extremely rare */
1322 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1323 * that detecting them is not worth the few extra
1324 * bytes of kernel's size.
1325 */
1326 break;
64545880 1327 case 39:
1da177e4 1328 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1da177e4
LT		 1329 break;
1330 case 49:
1331 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1332 break;
1333 default:
1334 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1335 vc->vc_color = color_table[vc->vc_par[i] - 30]
1336 | (vc->vc_color & 0xf0);
1337 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1338 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1339 | (vc->vc_color & 0x0f);
1340 break;
1341 }
1342 update_attr(vc);
1343}
1344
6732c8bb 1345static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1346{
1347 while (*p) {
6732c8bb 1348 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1349 p++;
1350 }
6732c8bb 1351 tty_schedule_flip(port);
1da177e4
LT		 1352}
1353
1354static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1355{
1356 char buf[40];
1357
1358 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1359 respond_string(buf, tty->port);
1da177e4
LT		 1360}
1361
1362static inline void status_report(struct tty_struct *tty)
1363{
6732c8bb 1364 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1365}
1366
6732c8bb 1367static inline void respond_ID(struct tty_struct *tty)
1da177e4 1368{
6732c8bb 1369 respond_string(VT102ID, tty->port);
1da177e4
LT		 1370}
1371
1372void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1373{
1374 char buf[8];
1375
1376 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1377 (char)('!' + mry));
6732c8bb 1378 respond_string(buf, tty->port);
1da177e4
LT		 1379}
1380
1381/* invoked via ioctl(TIOCLINUX) and through set_selection */
1382int mouse_reporting(void)
1383{
1384 return vc_cons[fg_console].d->vc_report_mouse;
1385}
1386
ac751efa 1387/* console_lock is held */
1da177e4
LT		 1388static void set_mode(struct vc_data *vc, int on_off)
1389{
1390 int i;
1391
1392 for (i = 0; i <= vc->vc_npar; i++)
1393 if (vc->vc_ques) {
1394 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1395 case 1: /* Cursor keys send ^[Ox/^[[x */
1396 if (on_off)
1397 set_kbd(vc, decckm);
1398 else
1399 clr_kbd(vc, decckm);
1400 break;
1401 case 3: /* 80/132 mode switch unimplemented */
1402 vc->vc_deccolm = on_off;
1403#if 0
1404 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1405 /* this alone does not suffice; some user mode
1406 utility has to change the hardware regs */
1407#endif
1408 break;
1409 case 5: /* Inverted screen on/off */
1410 if (vc->vc_decscnm != on_off) {
1411 vc->vc_decscnm = on_off;
1412 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1413 update_attr(vc);
1414 }
1415 break;
1416 case 6: /* Origin relative/absolute */
1417 vc->vc_decom = on_off;
1418 gotoxay(vc, 0, 0);
1419 break;
1420 case 7: /* Autowrap on/off */
1421 vc->vc_decawm = on_off;
1422 break;
1423 case 8: /* Autorepeat on/off */
1424 if (on_off)
1425 set_kbd(vc, decarm);
1426 else
1427 clr_kbd(vc, decarm);
1428 break;
1429 case 9:
1430 vc->vc_report_mouse = on_off ? 1 : 0;
1431 break;
1432 case 25: /* Cursor on/off */
1433 vc->vc_deccm = on_off;
1434 break;
1435 case 1000:
1436 vc->vc_report_mouse = on_off ? 2 : 0;
1437 break;
1438 }
1439 } else {
1440 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1441 case 3: /* Monitor (display ctrls) */
1442 vc->vc_disp_ctrl = on_off;
1443 break;
1444 case 4: /* Insert Mode on/off */
1445 vc->vc_decim = on_off;
1446 break;
1447 case 20: /* Lf, Enter == CrLf/Lf */
1448 if (on_off)
1449 set_kbd(vc, lnm);
1450 else
1451 clr_kbd(vc, lnm);
1452 break;
1453 }
1454 }
1455}
1456
ac751efa 1457/* console_lock is held */
1da177e4
LT		 1458static void setterm_command(struct vc_data *vc)
1459{
1460 switch(vc->vc_par[0]) {
1461 case 1: /* set color for underline mode */
1462 if (vc->vc_can_do_color &&
1463 vc->vc_par[1] < 16) {
1464 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1465 if (vc->vc_underline)
1466 update_attr(vc);
1467 }
1468 break;
1469 case 2: /* set color for half intensity mode */
1470 if (vc->vc_can_do_color &&
1471 vc->vc_par[1] < 16) {
1472 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1473 if (vc->vc_intensity == 0)
1474 update_attr(vc);
1475 }
1476 break;
1477 case 8: /* store colors as defaults */
1478 vc->vc_def_color = vc->vc_attr;
1479 if (vc->vc_hi_font_mask == 0x100)
1480 vc->vc_def_color >>= 1;
1481 default_attr(vc);
1482 update_attr(vc);
1483 break;
1484 case 9: /* set blanking interval */
f324edc8 1485 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1486 poke_blanked_console();
1487 break;
1488 case 10: /* set bell frequency in Hz */
1489 if (vc->vc_npar >= 1)
1490 vc->vc_bell_pitch = vc->vc_par[1];
1491 else
1492 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1493 break;
1494 case 11: /* set bell duration in msec */
1495 if (vc->vc_npar >= 1)
1496 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1497 vc->vc_par[1] * HZ / 1000 : 0;
1498 else
1499 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1500 break;
1501 case 12: /* bring specified console to the front */
1502 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1503 set_console(vc->vc_par[1] - 1);
1504 break;
1505 case 13: /* unblank the screen */
1506 poke_blanked_console();
1507 break;
1508 case 14: /* set vesa powerdown interval */
1509 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1510 break;
1511 case 15: /* activate the previous console */
1512 set_console(last_console);
1513 break;
1514 }
1515}
1516
ac751efa 1517/* console_lock is held */
1da177e4
LT		 1518static void csi_at(struct vc_data *vc, unsigned int nr)
1519{
1520 if (nr > vc->vc_cols - vc->vc_x)
1521 nr = vc->vc_cols - vc->vc_x;
1522 else if (!nr)
1523 nr = 1;
1524 insert_char(vc, nr);
1525}
1526
ac751efa 1527/* console_lock is held */
1da177e4
LT		 1528static void csi_L(struct vc_data *vc, unsigned int nr)
1529{
1530 if (nr > vc->vc_rows - vc->vc_y)
1531 nr = vc->vc_rows - vc->vc_y;
1532 else if (!nr)
1533 nr = 1;
1534 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1535 vc->vc_need_wrap = 0;
1536}
1537
ac751efa 1538/* console_lock is held */
1da177e4
LT		 1539static void csi_P(struct vc_data *vc, unsigned int nr)
1540{
1541 if (nr > vc->vc_cols - vc->vc_x)
1542 nr = vc->vc_cols - vc->vc_x;
1543 else if (!nr)
1544 nr = 1;
1545 delete_char(vc, nr);
1546}
1547
ac751efa 1548/* console_lock is held */
1da177e4
LT		 1549static void csi_M(struct vc_data *vc, unsigned int nr)
1550{
1551 if (nr > vc->vc_rows - vc->vc_y)
1552 nr = vc->vc_rows - vc->vc_y;
1553 else if (!nr)
1554 nr=1;
1555 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1556 vc->vc_need_wrap = 0;
1557}
1558
ac751efa 1559/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1560static void save_cur(struct vc_data *vc)
1561{
1562 vc->vc_saved_x = vc->vc_x;
1563 vc->vc_saved_y = vc->vc_y;
1564 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1565 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1566 vc->vc_s_underline = vc->vc_underline;
1567 vc->vc_s_blink = vc->vc_blink;
1568 vc->vc_s_reverse = vc->vc_reverse;
1569 vc->vc_s_charset = vc->vc_charset;
1570 vc->vc_s_color = vc->vc_color;
1571 vc->vc_saved_G0 = vc->vc_G0_charset;
1572 vc->vc_saved_G1 = vc->vc_G1_charset;
1573}
1574
ac751efa 1575/* console_lock is held */
1da177e4
LT		 1576static void restore_cur(struct vc_data *vc)
1577{
1578 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1579 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1580 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1581 vc->vc_underline = vc->vc_s_underline;
1582 vc->vc_blink = vc->vc_s_blink;
1583 vc->vc_reverse = vc->vc_s_reverse;
1584 vc->vc_charset = vc->vc_s_charset;
1585 vc->vc_color = vc->vc_s_color;
1586 vc->vc_G0_charset = vc->vc_saved_G0;
1587 vc->vc_G1_charset = vc->vc_saved_G1;
1588 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1589 update_attr(vc);
1590 vc->vc_need_wrap = 0;
1591}
1592
b290af68 1593enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1da177e4 1594 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
63f3a16d 1595 ESpalette, ESosc };
1da177e4 1596
ac751efa 1597/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1598static void reset_terminal(struct vc_data *vc, int do_clear)
1599{
1600 vc->vc_top = 0;
1601 vc->vc_bottom = vc->vc_rows;
1602 vc->vc_state = ESnormal;
1603 vc->vc_ques = 0;
1604 vc->vc_translate = set_translate(LAT1_MAP, vc);
1605 vc->vc_G0_charset = LAT1_MAP;
1606 vc->vc_G1_charset = GRAF_MAP;
1607 vc->vc_charset = 0;
1608 vc->vc_need_wrap = 0;
1609 vc->vc_report_mouse = 0;
042f10ec 1610 vc->vc_utf = default_utf8;
1da177e4
LT		 1611 vc->vc_utf_count = 0;
1612
1613 vc->vc_disp_ctrl = 0;
1614 vc->vc_toggle_meta = 0;
1615
1616 vc->vc_decscnm = 0;
1617 vc->vc_decom = 0;
1618 vc->vc_decawm = 1;
f6c06b68 1619 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1620 vc->vc_decim = 0;
1621
079c9534 1622 vt_reset_keyboard(vc->vc_num);
1da177e4 1623
9ea9a886 1624 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1625 vc->vc_complement_mask = vc->vc_s_complement_mask;
1626
1627 default_attr(vc);
1628 update_attr(vc);
1629
1630 vc->vc_tab_stop[0] = 0x01010100;
1631 vc->vc_tab_stop[1] =
1632 vc->vc_tab_stop[2] =
1633 vc->vc_tab_stop[3] =
a564738c
WK		 1634 vc->vc_tab_stop[4] =
1635 vc->vc_tab_stop[5] =
1636 vc->vc_tab_stop[6] =
1637 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1638
1639 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1640 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1641
1642 gotoxy(vc, 0, 0);
1643 save_cur(vc);
1644 if (do_clear)
1645 csi_J(vc, 2);
1646}
1647
ac751efa 1648/* console_lock is held */
1da177e4
LT		 1649static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1650{
1651 /*
1652 * Control characters can be used in the _middle_
1653 * of an escape sequence.
1654 */
63f3a16d
AB		 1655 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1656 return;
1da177e4
LT		 1657 switch (c) {
1658 case 0:
1659 return;
1660 case 7:
63f3a16d
AB		 1661 if (vc->vc_state == ESosc)
1662 vc->vc_state = ESnormal;
1663 else if (vc->vc_bell_duration)
1da177e4
LT		 1664 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1665 return;
1666 case 8:
1667 bs(vc);
1668 return;
1669 case 9:
1670 vc->vc_pos -= (vc->vc_x << 1);
1671 while (vc->vc_x < vc->vc_cols - 1) {
1672 vc->vc_x++;
1673 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1674 break;
1675 }
1676 vc->vc_pos += (vc->vc_x << 1);
b293d758 1677 notify_write(vc, '\t');
1da177e4
LT		 1678 return;
1679 case 10: case 11: case 12:
1680 lf(vc);
1681 if (!is_kbd(vc, lnm))
1682 return;
1683 case 13:
1684 cr(vc);
1685 return;
1686 case 14:
1687 vc->vc_charset = 1;
1688 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1689 vc->vc_disp_ctrl = 1;
1690 return;
1691 case 15:
1692 vc->vc_charset = 0;
1693 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1694 vc->vc_disp_ctrl = 0;
1695 return;
1696 case 24: case 26:
1697 vc->vc_state = ESnormal;
1698 return;
1699 case 27:
1700 vc->vc_state = ESesc;
1701 return;
1702 case 127:
1703 del(vc);
1704 return;
1705 case 128+27:
1706 vc->vc_state = ESsquare;
1707 return;
1708 }
1709 switch(vc->vc_state) {
1710 case ESesc:
1711 vc->vc_state = ESnormal;
1712 switch (c) {
1713 case '[':
1714 vc->vc_state = ESsquare;
1715 return;
1716 case ']':
1717 vc->vc_state = ESnonstd;
1718 return;
1719 case '%':
1720 vc->vc_state = ESpercent;
1721 return;
1722 case 'E':
1723 cr(vc);
1724 lf(vc);
1725 return;
1726 case 'M':
1727 ri(vc);
1728 return;
1729 case 'D':
1730 lf(vc);
1731 return;
1732 case 'H':
1733 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1734 return;
1735 case 'Z':
1736 respond_ID(tty);
1737 return;
1738 case '7':
1739 save_cur(vc);
1740 return;
1741 case '8':
1742 restore_cur(vc);
1743 return;
1744 case '(':
1745 vc->vc_state = ESsetG0;
1746 return;
1747 case ')':
1748 vc->vc_state = ESsetG1;
1749 return;
1750 case '#':
1751 vc->vc_state = EShash;
1752 return;
1753 case 'c':
1754 reset_terminal(vc, 1);
1755 return;
1756 case '>': /* Numeric keypad */
1757 clr_kbd(vc, kbdapplic);
1758 return;
1759 case '=': /* Appl. keypad */
1760 set_kbd(vc, kbdapplic);
1761 return;
1762 }
1763 return;
1764 case ESnonstd:
1765 if (c=='P') { /* palette escape sequence */
1766 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1767 vc->vc_par[vc->vc_npar] = 0;
1768 vc->vc_npar = 0;
1769 vc->vc_state = ESpalette;
1770 return;
1771 } else if (c=='R') { /* reset palette */
1772 reset_palette(vc);
1773 vc->vc_state = ESnormal;
63f3a16d
AB		 1774 } else if (c>='0' && c<='9')
1775 vc->vc_state = ESosc;
1776 else
1da177e4
LT		 1777 vc->vc_state = ESnormal;
1778 return;
1779 case ESpalette:
74c807ce
AS		 1780 if (isxdigit(c)) {
1781 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1782 if (vc->vc_npar == 7) {
1783 int i = vc->vc_par[0] * 3, j = 1;
1784 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1785 vc->vc_palette[i++] += vc->vc_par[j++];
1786 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1787 vc->vc_palette[i++] += vc->vc_par[j++];
1788 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1789 vc->vc_palette[i] += vc->vc_par[j];
1790 set_palette(vc);
1791 vc->vc_state = ESnormal;
1792 }
1793 } else
1794 vc->vc_state = ESnormal;
1795 return;
1796 case ESsquare:
1797 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1798 vc->vc_par[vc->vc_npar] = 0;
1799 vc->vc_npar = 0;
1800 vc->vc_state = ESgetpars;
1801 if (c == '[') { /* Function key */
1802 vc->vc_state=ESfunckey;
1803 return;
1804 }
1805 vc->vc_ques = (c == '?');
1806 if (vc->vc_ques)
1807 return;
1808 case ESgetpars:
1809 if (c == ';' && vc->vc_npar < NPAR - 1) {
1810 vc->vc_npar++;
1811 return;
1812 } else if (c>='0' && c<='9') {
1813 vc->vc_par[vc->vc_npar] *= 10;
1814 vc->vc_par[vc->vc_npar] += c - '0';
1815 return;
b290af68 1816 }
1da177e4
LT		 1817 vc->vc_state = ESnormal;
1818 switch(c) {
1819 case 'h':
1820 set_mode(vc, 1);
1821 return;
1822 case 'l':
1823 set_mode(vc, 0);
1824 return;
1825 case 'c':
1826 if (vc->vc_ques) {
1827 if (vc->vc_par[0])
1828 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1829 else
9ea9a886 1830 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1831 return;
1832 }
1833 break;
1834 case 'm':
1835 if (vc->vc_ques) {
1836 clear_selection();
1837 if (vc->vc_par[0])
1838 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1839 else
1840 vc->vc_complement_mask = vc->vc_s_complement_mask;
1841 return;
1842 }
1843 break;
1844 case 'n':
1845 if (!vc->vc_ques) {
1846 if (vc->vc_par[0] == 5)
1847 status_report(tty);
1848 else if (vc->vc_par[0] == 6)
1849 cursor_report(vc, tty);
1850 }
1851 return;
1852 }
1853 if (vc->vc_ques) {
1854 vc->vc_ques = 0;
1855 return;
1856 }
1857 switch(c) {
1858 case 'G': case '`':
1859 if (vc->vc_par[0])
1860 vc->vc_par[0]--;
1861 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1862 return;
1863 case 'A':
1864 if (!vc->vc_par[0])
1865 vc->vc_par[0]++;
1866 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1867 return;
1868 case 'B': case 'e':
1869 if (!vc->vc_par[0])
1870 vc->vc_par[0]++;
1871 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1872 return;
1873 case 'C': case 'a':
1874 if (!vc->vc_par[0])
1875 vc->vc_par[0]++;
1876 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1877 return;
1878 case 'D':
1879 if (!vc->vc_par[0])
1880 vc->vc_par[0]++;
1881 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1882 return;
1883 case 'E':
1884 if (!vc->vc_par[0])
1885 vc->vc_par[0]++;
1886 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1887 return;
1888 case 'F':
1889 if (!vc->vc_par[0])
1890 vc->vc_par[0]++;
1891 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1892 return;
1893 case 'd':
1894 if (vc->vc_par[0])
1895 vc->vc_par[0]--;
1896 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1897 return;
1898 case 'H': case 'f':
1899 if (vc->vc_par[0])
1900 vc->vc_par[0]--;
1901 if (vc->vc_par[1])
1902 vc->vc_par[1]--;
1903 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1904 return;
1905 case 'J':
1906 csi_J(vc, vc->vc_par[0]);
1907 return;
1908 case 'K':
1909 csi_K(vc, vc->vc_par[0]);
1910 return;
1911 case 'L':
1912 csi_L(vc, vc->vc_par[0]);
1913 return;
1914 case 'M':
1915 csi_M(vc, vc->vc_par[0]);
1916 return;
1917 case 'P':
1918 csi_P(vc, vc->vc_par[0]);
1919 return;
1920 case 'c':
1921 if (!vc->vc_par[0])
1922 respond_ID(tty);
1923 return;
1924 case 'g':
1925 if (!vc->vc_par[0])
1926 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1927 else if (vc->vc_par[0] == 3) {
1928 vc->vc_tab_stop[0] =
1929 vc->vc_tab_stop[1] =
1930 vc->vc_tab_stop[2] =
1931 vc->vc_tab_stop[3] =
a564738c
WK		 1932 vc->vc_tab_stop[4] =
1933 vc->vc_tab_stop[5] =
1934 vc->vc_tab_stop[6] =
1935 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 1936 }
1937 return;
1938 case 'm':
1939 csi_m(vc);
1940 return;
1941 case 'q': /* DECLL - but only 3 leds */
1942 /* map 0,1,2,3 to 0,1,2,4 */
1943 if (vc->vc_par[0] < 4)
079c9534 1944 vt_set_led_state(vc->vc_num,
1da177e4
LT		 1945 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1946 return;
1947 case 'r':
1948 if (!vc->vc_par[0])
1949 vc->vc_par[0]++;
1950 if (!vc->vc_par[1])
1951 vc->vc_par[1] = vc->vc_rows;
1952 /* Minimum allowed region is 2 lines */
1953 if (vc->vc_par[0] < vc->vc_par[1] &&
1954 vc->vc_par[1] <= vc->vc_rows) {
1955 vc->vc_top = vc->vc_par[0] - 1;
1956 vc->vc_bottom = vc->vc_par[1];
1957 gotoxay(vc, 0, 0);
1958 }
1959 return;
1960 case 's':
1961 save_cur(vc);
1962 return;
1963 case 'u':
1964 restore_cur(vc);
1965 return;
1966 case 'X':
1967 csi_X(vc, vc->vc_par[0]);
1968 return;
1969 case '@':
1970 csi_at(vc, vc->vc_par[0]);
1971 return;
1972 case ']': /* setterm functions */
1973 setterm_command(vc);
1974 return;
1975 }
1976 return;
1977 case ESpercent:
1978 vc->vc_state = ESnormal;
1979 switch (c) {
1980 case '@': /* defined in ISO 2022 */
1981 vc->vc_utf = 0;
1982 return;
1983 case 'G': /* prelim official escape code */
1984 case '8': /* retained for compatibility */
1985 vc->vc_utf = 1;
1986 return;
1987 }
1988 return;
1989 case ESfunckey:
1990 vc->vc_state = ESnormal;
1991 return;
1992 case EShash:
1993 vc->vc_state = ESnormal;
1994 if (c == '8') {
1995 /* DEC screen alignment test. kludge :-) */
1996 vc->vc_video_erase_char =
1997 (vc->vc_video_erase_char & 0xff00) | 'E';
1998 csi_J(vc, 2);
1999 vc->vc_video_erase_char =
2000 (vc->vc_video_erase_char & 0xff00) | ' ';
2001 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2002 }
2003 return;
2004 case ESsetG0:
2005 if (c == '0')
2006 vc->vc_G0_charset = GRAF_MAP;
2007 else if (c == 'B')
2008 vc->vc_G0_charset = LAT1_MAP;
2009 else if (c == 'U')
2010 vc->vc_G0_charset = IBMPC_MAP;
2011 else if (c == 'K')
2012 vc->vc_G0_charset = USER_MAP;
2013 if (vc->vc_charset == 0)
2014 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2015 vc->vc_state = ESnormal;
2016 return;
2017 case ESsetG1:
2018 if (c == '0')
2019 vc->vc_G1_charset = GRAF_MAP;
2020 else if (c == 'B')
2021 vc->vc_G1_charset = LAT1_MAP;
2022 else if (c == 'U')
2023 vc->vc_G1_charset = IBMPC_MAP;
2024 else if (c == 'K')
2025 vc->vc_G1_charset = USER_MAP;
2026 if (vc->vc_charset == 1)
2027 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2028 vc->vc_state = ESnormal;
2029 return;
63f3a16d
AB		 2030 case ESosc:
2031 return;
1da177e4
LT		 2032 default:
2033 vc->vc_state = ESnormal;
2034 }
2035}
2036
2f1a2ccb 2037/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2038 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2039 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2040 */
2041struct interval {
2042 uint32_t first;
2043 uint32_t last;
2044};
2045
2046static int bisearch(uint32_t ucs, const struct interval *table, int max)
2047{
2048 int min = 0;
2049 int mid;
2050
2051 if (ucs < table[0].first || ucs > table[max].last)
2052 return 0;
2053 while (max >= min) {
2054 mid = (min + max) / 2;
2055 if (ucs > table[mid].last)
2056 min = mid + 1;
2057 else if (ucs < table[mid].first)
2058 max = mid - 1;
2059 else
2060 return 1;
2061 }
2062 return 0;
2063}
2064
2065static int is_double_width(uint32_t ucs)
2066{
2067 static const struct interval double_width[] = {
2068 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2069 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2070 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2071 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2072 };
0f11541b 2073 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2074}
2075
ac751efa 2076/* acquires console_lock */
1da177e4
LT		 2077static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2078{
2079#ifdef VT_BUF_VRAM_ONLY
2080#define FLUSH do { } while(0);
2081#else
2082#define FLUSH if (draw_x >= 0) { \
2083 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2084 draw_x = -1; \
2085 }
2086#endif
2087
2088 int c, tc, ok, n = 0, draw_x = -1;
2089 unsigned int currcons;
2090 unsigned long draw_from = 0, draw_to = 0;
2091 struct vc_data *vc;
2f1a2ccb 2092 unsigned char vc_attr;
0341a4d0 2093 struct vt_notifier_param param;
2f1a2ccb
EK		 2094 uint8_t rescan;
2095 uint8_t inverse;
2096 uint8_t width;
1da177e4 2097 u16 himask, charmask;
1da177e4
LT		 2098
2099 if (in_interrupt())
2100 return count;
2101
2102 might_sleep();
2103
ac751efa 2104 console_lock();
1da177e4
LT		 2105 vc = tty->driver_data;
2106 if (vc == NULL) {
2107 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2108 console_unlock();
1da177e4
LT		 2109 return 0;
2110 }
2111
2112 currcons = vc->vc_num;
2113 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2114 /* could this happen? */
2115 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2116 console_unlock();
2117 return 0;
1da177e4 2118 }
1da177e4 2119
1da177e4
LT		 2120 himask = vc->vc_hi_font_mask;
2121 charmask = himask ? 0x1ff : 0xff;
2122
2123 /* undraw cursor first */
2124 if (IS_FG(vc))
2125 hide_cursor(vc);
2126
0341a4d0
KD		 2127 param.vc = vc;
2128
1da177e4
LT		 2129 while (!tty->stopped && count) {
2130 int orig = *buf;
2131 c = orig;
2132 buf++;
2133 n++;
2134 count--;
2f1a2ccb
EK		 2135 rescan = 0;
2136 inverse = 0;
2137 width = 1;
1da177e4
LT		 2138
2139 /* Do no translation at all in control states */
2140 if (vc->vc_state != ESnormal) {
2141 tc = c;
d4328b40 2142 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2143 /* Combine UTF-8 into Unicode in vc_utf_char.
2144 * vc_utf_count is the number of continuation bytes still
2145 * expected to arrive.
2146 * vc_npar is the number of continuation bytes arrived so
2147 * far
2148 */
d4328b40 2149rescan_last_byte:
2f1a2ccb
EK		 2150 if ((c & 0xc0) == 0x80) {
2151 /* Continuation byte received */
2152 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2153 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2154 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2155 vc->vc_npar++;
2156 if (--vc->vc_utf_count) {
2157 /* Still need some bytes */
1da177e4 2158 continue;
2f1a2ccb
EK		 2159 }
2160 /* Got a whole character */
2161 c = vc->vc_utf_char;
2162 /* Reject overlong sequences */
2163 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2164 c > utf8_length_changes[vc->vc_npar])
2165 c = 0xfffd;
2166 } else {
2167 /* Unexpected continuation byte */
2168 vc->vc_utf_count = 0;
2169 c = 0xfffd;
2170 }
1da177e4 2171 } else {
2f1a2ccb
EK		 2172 /* Single ASCII byte or first byte of a sequence received */
2173 if (vc->vc_utf_count) {
2174 /* Continuation byte expected */
2175 rescan = 1;
2176 vc->vc_utf_count = 0;
2177 c = 0xfffd;
2178 } else if (c > 0x7f) {
2179 /* First byte of a multibyte sequence received */
2180 vc->vc_npar = 0;
2181 if ((c & 0xe0) == 0xc0) {
2182 vc->vc_utf_count = 1;
2183 vc->vc_utf_char = (c & 0x1f);
2184 } else if ((c & 0xf0) == 0xe0) {
2185 vc->vc_utf_count = 2;
2186 vc->vc_utf_char = (c & 0x0f);
2187 } else if ((c & 0xf8) == 0xf0) {
2188 vc->vc_utf_count = 3;
2189 vc->vc_utf_char = (c & 0x07);
2190 } else if ((c & 0xfc) == 0xf8) {
2191 vc->vc_utf_count = 4;
2192 vc->vc_utf_char = (c & 0x03);
2193 } else if ((c & 0xfe) == 0xfc) {
2194 vc->vc_utf_count = 5;
2195 vc->vc_utf_char = (c & 0x01);
2196 } else {
2197 /* 254 and 255 are invalid */
2198 c = 0xfffd;
2199 }
2200 if (vc->vc_utf_count) {
2201 /* Still need some bytes */
2202 continue;
2203 }
2204 }
2205 /* Nothing to do if an ASCII byte was received */
1da177e4 2206 }
2f1a2ccb
EK		 2207 /* End of UTF-8 decoding. */
2208 /* c is the received character, or U+FFFD for invalid sequences. */
2209 /* Replace invalid Unicode code points with U+FFFD too */
2210 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2211 c = 0xfffd;
2212 tc = c;
d4328b40 2213 } else { /* no utf or alternate charset mode */
a29ccf6f 2214 tc = vc_translate(vc, c);
1da177e4
LT		 2215 }
2216
0341a4d0
KD		 2217 param.c = tc;
2218 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2219 &param) == NOTIFY_STOP)
2220 continue;
2221
1da177e4
LT		 2222 /* If the original code was a control character we
2223 * only allow a glyph to be displayed if the code is
2224 * not normally used (such as for cursor movement) or
2225 * if the disp_ctrl mode has been explicitly enabled.
2226 * Certain characters (as given by the CTRL_ALWAYS
2227 * bitmap) are always displayed as control characters,
2228 * as the console would be pretty useless without
2229 * them; to display an arbitrary font position use the
2230 * direct-to-font zone in UTF-8 mode.
2231 */
2232 ok = tc && (c >= 32 ||
d4328b40
AT		 2233 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2234 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2235 && (c != 127 || vc->vc_disp_ctrl)
2236 && (c != 128+27);
2237
2238 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2239 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2240 if (is_double_width(c))
2241 width = 2;
2242 }
1da177e4
LT		 2243 /* Now try to find out how to display it */
2244 tc = conv_uni_to_pc(vc, tc);
d4328b40 2245 if (tc & ~charmask) {
2f1a2ccb
EK		 2246 if (tc == -1 || tc == -2) {
2247 continue; /* nothing to display */
2248 }
2249 /* Glyph not found */
c0b79882 2250 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2251 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2252 This would make absolutely no sense with Unicode in mind,
2253 but do this for ASCII characters since a font may lack
2254 Unicode mapping info and we don't want to end up with
2255 having question marks only. */
2f1a2ccb
EK		 2256 tc = c;
2257 } else {
2258 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2259 tc = conv_uni_to_pc(vc, 0xfffd);
2260 if (tc < 0) {
2261 inverse = 1;
2262 tc = conv_uni_to_pc(vc, '?');
2263 if (tc < 0) tc = '?';
2264 }
2265 }
d4328b40 2266 }
1da177e4 2267
2f1a2ccb
EK		 2268 if (!inverse) {
2269 vc_attr = vc->vc_attr;
1da177e4 2270 } else {
2f1a2ccb
EK		 2271 /* invert vc_attr */
2272 if (!vc->vc_can_do_color) {
2273 vc_attr = (vc->vc_attr) ^ 0x08;
2274 } else if (vc->vc_hi_font_mask == 0x100) {
2275 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2276 } else {
2277 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2278 }
1ed8a2b3 2279 FLUSH
1da177e4 2280 }
2f1a2ccb
EK		 2281
2282 while (1) {
2283 if (vc->vc_need_wrap || vc->vc_decim)
2284 FLUSH
2285 if (vc->vc_need_wrap) {
2286 cr(vc);
2287 lf(vc);
2288 }
2289 if (vc->vc_decim)
2290 insert_char(vc, 1);
2291 scr_writew(himask ?
2292 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2293 (vc_attr << 8) + tc,
2294 (u16 *) vc->vc_pos);
2295 if (DO_UPDATE(vc) && draw_x < 0) {
2296 draw_x = vc->vc_x;
2297 draw_from = vc->vc_pos;
2298 }
2299 if (vc->vc_x == vc->vc_cols - 1) {
2300 vc->vc_need_wrap = vc->vc_decawm;
2301 draw_to = vc->vc_pos + 2;
2302 } else {
2303 vc->vc_x++;
2304 draw_to = (vc->vc_pos += 2);
d4328b40 2305 }
2f1a2ccb
EK		 2306
2307 if (!--width) break;
2308
2309 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2310 if (tc < 0) tc = ' ';
2311 }
b293d758 2312 notify_write(vc, c);
2f1a2ccb 2313
1ed8a2b3
EK		 2314 if (inverse) {
2315 FLUSH
2316 }
2317
2f1a2ccb
EK		 2318 if (rescan) {
2319 rescan = 0;
2320 inverse = 0;
2321 width = 1;
d4328b40
AT		 2322 c = orig;
2323 goto rescan_last_byte;
2324 }
1da177e4
LT		 2325 continue;
2326 }
2327 FLUSH
2328 do_con_trol(tty, vc, orig);
2329 }
2330 FLUSH
2331 console_conditional_schedule();
ac751efa 2332 console_unlock();
b293d758 2333 notify_update(vc);
1da177e4
LT		 2334 return n;
2335#undef FLUSH
2336}
2337
2338/*
2339 * This is the console switching callback.
2340 *
2341 * Doing console switching in a process context allows
2342 * us to do the switches asynchronously (needed when we want
2343 * to switch due to a keyboard interrupt). Synchronization
2344 * with other console code and prevention of re-entrancy is
ac751efa 2345 * ensured with console_lock.
1da177e4 2346 */
65f27f38 2347static void console_callback(struct work_struct *ignored)
1da177e4 2348{
ac751efa 2349 console_lock();
1da177e4
LT		 2350
2351 if (want_console >= 0) {
2352 if (want_console != fg_console &&
2353 vc_cons_allocated(want_console)) {
2354 hide_cursor(vc_cons[fg_console].d);
2355 change_console(vc_cons[want_console].d);
2356 /* we only changed when the console had already
2357 been allocated - a new console is not created
2358 in an interrupt routine */
2359 }
2360 want_console = -1;
2361 }
2362 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2363 do_poke_blanked_console = 0;
2364 poke_blanked_console();
2365 }
2366 if (scrollback_delta) {
2367 struct vc_data *vc = vc_cons[fg_console].d;
2368 clear_selection();
2369 if (vc->vc_mode == KD_TEXT)
2370 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2371 scrollback_delta = 0;
2372 }
2373 if (blank_timer_expired) {
2374 do_blank_screen(0);
2375 blank_timer_expired = 0;
2376 }
b293d758 2377 notify_update(vc_cons[fg_console].d);
1da177e4 2378
ac751efa 2379 console_unlock();
1da177e4
LT		 2380}
2381
b257bc05 2382int set_console(int nr)
1da177e4 2383{
b257bc05
AJ		 2384 struct vc_data *vc = vc_cons[fg_console].d;
2385
2386 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2387 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2388
2389 /*
2390 * Console switch will fail in console_callback() or
2391 * change_console() so there is no point scheduling
2392 * the callback
2393 *
2394 * Existing set_console() users don't check the return
2395 * value so this shouldn't break anything
2396 */
2397 return -EINVAL;
2398 }
2399
1da177e4
LT		 2400 want_console = nr;
2401 schedule_console_callback();
b257bc05
AJ		 2402
2403 return 0;
1da177e4
LT		 2404}
2405
2406struct tty_driver *console_driver;
2407
2408#ifdef CONFIG_VT_CONSOLE
2409
5ada918b
BW		 2410/**
2411 * vt_kmsg_redirect() - Sets/gets the kernel message console
2412 * @new: The new virtual terminal number or -1 if the console should stay
2413 * unchanged
2414 *
2415 * By default, the kernel messages are always printed on the current virtual
2416 * console. However, the user may modify that default with the
2417 * TIOCL_SETKMSGREDIRECT ioctl call.
2418 *
2419 * This function sets the kernel message console to be @new. It returns the old
2420 * virtual console number. The virtual terminal number 0 (both as parameter and
2421 * return value) means no redirection (i.e. always printed on the currently
2422 * active console).
2423 *
2424 * The parameter -1 means that only the current console is returned, but the
2425 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2426 * case to make the code more understandable.
2427 *
2428 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2429 * the parameter and always returns 0.
2430 */
2431int vt_kmsg_redirect(int new)
2432{
2433 static int kmsg_con;
2434
2435 if (new != -1)
2436 return xchg(&kmsg_con, new);
2437 else
2438 return kmsg_con;
2439}
2440
1da177e4
LT		 2441/*
2442 * Console on virtual terminal
2443 *
2444 * The console must be locked when we get here.
2445 */
2446
2447static void vt_console_print(struct console *co, const char *b, unsigned count)
2448{
2449 struct vc_data *vc = vc_cons[fg_console].d;
2450 unsigned char c;
b0940003 2451 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2452 const ushort *start;
2453 ushort cnt = 0;
2454 ushort myx;
5ada918b 2455 int kmsg_console;
1da177e4
LT		 2456
2457 /* console busy or not yet initialized */
b0940003
NP		 2458 if (!printable)
2459 return;
2460 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2461 return;
2462
5ada918b
BW		 2463 kmsg_console = vt_get_kmsg_redirect();
2464 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2465 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2466
2467 /* read `x' only after setting currcons properly (otherwise
2468 the `x' macro will read the x of the foreground console). */
2469 myx = vc->vc_x;
2470
2471 if (!vc_cons_allocated(fg_console)) {
2472 /* impossible */
2473 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2474 goto quit;
2475 }
2476
8fd4bd22 2477 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2478 goto quit;
2479
2480 /* undraw cursor first */
2481 if (IS_FG(vc))
2482 hide_cursor(vc);
2483
2484 start = (ushort *)vc->vc_pos;
2485
2486 /* Contrived structure to try to emulate original need_wrap behaviour
2487 * Problems caused when we have need_wrap set on '\n' character */
2488 while (count--) {
2489 c = *b++;
2490 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2491 if (cnt > 0) {
2492 if (CON_IS_VISIBLE(vc))
2493 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2494 vc->vc_x += cnt;
2495 if (vc->vc_need_wrap)
2496 vc->vc_x--;
2497 cnt = 0;
2498 }
2499 if (c == 8) { /* backspace */
2500 bs(vc);
2501 start = (ushort *)vc->vc_pos;
2502 myx = vc->vc_x;
2503 continue;
2504 }
2505 if (c != 13)
2506 lf(vc);
2507 cr(vc);
2508 start = (ushort *)vc->vc_pos;
2509 myx = vc->vc_x;
2510 if (c == 10 || c == 13)
2511 continue;
2512 }
2513 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2514 notify_write(vc, c);
1da177e4
LT		 2515 cnt++;
2516 if (myx == vc->vc_cols - 1) {
2517 vc->vc_need_wrap = 1;
2518 continue;
2519 }
2520 vc->vc_pos += 2;
2521 myx++;
2522 }
2523 if (cnt > 0) {
2524 if (CON_IS_VISIBLE(vc))
2525 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2526 vc->vc_x += cnt;
2527 if (vc->vc_x == vc->vc_cols) {
2528 vc->vc_x--;
2529 vc->vc_need_wrap = 1;
2530 }
2531 }
2532 set_cursor(vc);
b293d758 2533 notify_update(vc);
1da177e4
LT		 2534
2535quit:
b0940003 2536 spin_unlock(&printing_lock);
1da177e4
LT		 2537}
2538
2539static struct tty_driver *vt_console_device(struct console *c, int *index)
2540{
2541 *index = c->index ? c->index-1 : fg_console;
2542 return console_driver;
2543}
2544
2545static struct console vt_console_driver = {
2546 .name = "tty",
2547 .write = vt_console_print,
2548 .device = vt_console_device,
2549 .unblank = unblank_screen,
2550 .flags = CON_PRINTBUFFER,
2551 .index = -1,
2552};
2553#endif
2554
2555/*
2556 * Handling of Linux-specific VC ioctls
2557 */
2558
2559/*
ac751efa 2560 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2561 *
2562 * There are some functions which don't need it.
2563 *
2564 * There are some functions which can sleep for arbitrary periods
2565 * (paste_selection) but we don't need the lock there anyway.
2566 *
2567 * set_selection has locking, and definitely needs it
2568 */
2569
2570int tioclinux(struct tty_struct *tty, unsigned long arg)
2571{
2572 char type, data;
2573 char __user *p = (char __user *)arg;
2574 int lines;
2575 int ret;
2576
1da177e4
LT		 2577 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2578 return -EPERM;
2579 if (get_user(type, p))
2580 return -EFAULT;
2581 ret = 0;
04f378b1 2582
1da177e4
LT		 2583 switch (type)
2584 {
2585 case TIOCL_SETSEL:
ac751efa 2586 console_lock();
1da177e4 2587 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2588 console_unlock();
1da177e4
LT		 2589 break;
2590 case TIOCL_PASTESEL:
2591 ret = paste_selection(tty);
2592 break;
2593 case TIOCL_UNBLANKSCREEN:
ac751efa 2594 console_lock();
1da177e4 2595 unblank_screen();
ac751efa 2596 console_unlock();
1da177e4
LT		 2597 break;
2598 case TIOCL_SELLOADLUT:
5289475d 2599 console_lock();
1da177e4 2600 ret = sel_loadlut(p);
5289475d 2601 console_unlock();
1da177e4
LT		 2602 break;
2603 case TIOCL_GETSHIFTSTATE:
04f378b1 2604
1da177e4
LT		 2605 /*
2606 * Make it possible to react to Shift+Mousebutton.
2607 * Note that 'shift_state' is an undocumented
2608 * kernel-internal variable; programs not closely
2609 * related to the kernel should not use this.
2610 */
079c9534 2611 data = vt_get_shift_state();
1da177e4
LT		 2612 ret = __put_user(data, p);
2613 break;
2614 case TIOCL_GETMOUSEREPORTING:
20f62579 2615 console_lock(); /* May be overkill */
1da177e4 2616 data = mouse_reporting();
20f62579 2617 console_unlock();
1da177e4
LT		 2618 ret = __put_user(data, p);
2619 break;
2620 case TIOCL_SETVESABLANK:
20f62579 2621 console_lock();
403aac96 2622 ret = set_vesa_blanking(p);
20f62579 2623 console_unlock();
1da177e4 2624 break;
0ca07731 2625 case TIOCL_GETKMSGREDIRECT:
5ada918b 2626 data = vt_get_kmsg_redirect();
0ca07731
RW		 2627 ret = __put_user(data, p);
2628 break;
1da177e4
LT		 2629 case TIOCL_SETKMSGREDIRECT:
2630 if (!capable(CAP_SYS_ADMIN)) {
2631 ret = -EPERM;
2632 } else {
2633 if (get_user(data, p+1))
2634 ret = -EFAULT;
2635 else
5ada918b 2636 vt_kmsg_redirect(data);
1da177e4
LT		 2637 }
2638 break;
2639 case TIOCL_GETFGCONSOLE:
20f62579
AC		 2640 /* No locking needed as this is a transiently
2641 correct return anyway if the caller hasn't
2642 disabled switching */
1da177e4
LT		 2643 ret = fg_console;
2644 break;
2645 case TIOCL_SCROLLCONSOLE:
2646 if (get_user(lines, (s32 __user *)(p+4))) {
2647 ret = -EFAULT;
2648 } else {
20f62579
AC		 2649 /* Need the console lock here. Note that lots
2650 of other calls need fixing before the lock
2651 is actually useful ! */
2652 console_lock();
1da177e4 2653 scrollfront(vc_cons[fg_console].d, lines);
20f62579 2654 console_unlock();
1da177e4
LT		 2655 ret = 0;
2656 }
2657 break;
2658 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2659 console_lock();
1da177e4
LT		 2660 ignore_poke = 1;
2661 do_blank_screen(0);
ac751efa 2662 console_unlock();
1da177e4
LT		 2663 break;
2664 case TIOCL_BLANKEDSCREEN:
2665 ret = console_blanked;
2666 break;
2667 default:
2668 ret = -EINVAL;
2669 break;
2670 }
2671 return ret;
2672}
2673
2674/*
2675 * /dev/ttyN handling
2676 */
2677
2678static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2679{
2680 int retval;
2681
2682 retval = do_con_write(tty, buf, count);
2683 con_flush_chars(tty);
2684
2685 return retval;
2686}
2687
5d19f546 2688static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2689{
2690 if (in_interrupt())
5d19f546
AC		 2691 return 0; /* n_r3964 calls put_char() from interrupt context */
2692 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2693}
2694
2695static int con_write_room(struct tty_struct *tty)
2696{
2697 if (tty->stopped)
2698 return 0;
a88a69c9 2699 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2700}
2701
2702static int con_chars_in_buffer(struct tty_struct *tty)
2703{
2704 return 0; /* we're not buffering */
2705}
2706
2707/*
2708 * con_throttle and con_unthrottle are only used for
2709 * paste_selection(), which has to stuff in a large number of
2710 * characters...
2711 */
2712static void con_throttle(struct tty_struct *tty)
2713{
2714}
2715
2716static void con_unthrottle(struct tty_struct *tty)
2717{
2718 struct vc_data *vc = tty->driver_data;
2719
2720 wake_up_interruptible(&vc->paste_wait);
2721}
2722
2723/*
2724 * Turn the Scroll-Lock LED on when the tty is stopped
2725 */
2726static void con_stop(struct tty_struct *tty)
2727{
2728 int console_num;
2729 if (!tty)
2730 return;
2731 console_num = tty->index;
2732 if (!vc_cons_allocated(console_num))
2733 return;
079c9534 2734 vt_kbd_con_stop(console_num);
1da177e4
LT		 2735}
2736
2737/*
2738 * Turn the Scroll-Lock LED off when the console is started
2739 */
2740static void con_start(struct tty_struct *tty)
2741{
2742 int console_num;
2743 if (!tty)
2744 return;
2745 console_num = tty->index;
2746 if (!vc_cons_allocated(console_num))
2747 return;
079c9534 2748 vt_kbd_con_start(console_num);
1da177e4
LT		 2749}
2750
2751static void con_flush_chars(struct tty_struct *tty)
2752{
2753 struct vc_data *vc;
2754
2755 if (in_interrupt()) /* from flush_to_ldisc */
2756 return;
2757
2758 /* if we race with con_close(), vt may be null */
ac751efa 2759 console_lock();
1da177e4
LT		 2760 vc = tty->driver_data;
2761 if (vc)
2762 set_cursor(vc);
ac751efa 2763 console_unlock();
1da177e4
LT		 2764}
2765
2766/*
2767 * Allocate the console screen memory.
2768 */
bc1e99d9 2769static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 2770{
2771 unsigned int currcons = tty->index;
bc1e99d9
JS		 2772 struct vc_data *vc;
2773 int ret;
1da177e4 2774
ac751efa 2775 console_lock();
bc1e99d9
JS		 2776 ret = vc_allocate(currcons);
2777 if (ret)
2778 goto unlock;
feebed65 2779
bc1e99d9 2780 vc = vc_cons[currcons].d;
1da177e4 2781
bc1e99d9
JS		 2782 /* Still being freed */
2783 if (vc->port.tty) {
2784 ret = -ERESTARTSYS;
2785 goto unlock;
2786 }
2787
2788 ret = tty_port_install(&vc->port, driver, tty);
2789 if (ret)
2790 goto unlock;
2791
2792 tty->driver_data = vc;
2793 vc->port.tty = tty;
2794
2795 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2796 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2797 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 2798 }
bc1e99d9 2799 if (vc->vc_utf)
adc8d746 2800 tty->termios.c_iflag |= IUTF8;
bc1e99d9 2801 else
adc8d746 2802 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 2803unlock:
ac751efa 2804 console_unlock();
1da177e4
LT		 2805 return ret;
2806}
2807
bc1e99d9
JS		 2808static int con_open(struct tty_struct *tty, struct file *filp)
2809{
2810 /* everything done in install */
2811 return 0;
2812}
2813
2814
1da177e4
LT		 2815static void con_close(struct tty_struct *tty, struct file *filp)
2816{
feebed65
AC		 2817 /* Nothing to do - we defer to shutdown */
2818}
1da177e4 2819
feebed65
AC		 2820static void con_shutdown(struct tty_struct *tty)
2821{
2822 struct vc_data *vc = tty->driver_data;
2823 BUG_ON(vc == NULL);
ac751efa 2824 console_lock();
8ce73264 2825 vc->port.tty = NULL;
ac751efa 2826 console_unlock();
1da177e4
LT		 2827}
2828
3855ae1c 2829static int default_color = 7; /* white */
fa6ce9ab
JE		 2830static int default_italic_color = 2; // green (ASCII)
2831static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 2832module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 2833module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2834module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2835
1da177e4
LT		 2836static void vc_init(struct vc_data *vc, unsigned int rows,
2837 unsigned int cols, int do_clear)
2838{
2839 int j, k ;
2840
2841 vc->vc_cols = cols;
2842 vc->vc_rows = rows;
2843 vc->vc_size_row = cols << 1;
2844 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2845
2846 set_origin(vc);
2847 vc->vc_pos = vc->vc_origin;
2848 reset_vc(vc);
2849 for (j=k=0; j<16; j++) {
2850 vc->vc_palette[k++] = default_red[j] ;
2851 vc->vc_palette[k++] = default_grn[j] ;
2852 vc->vc_palette[k++] = default_blu[j] ;
2853 }
3855ae1c 2854 vc->vc_def_color = default_color;
fa6ce9ab
JE		 2855 vc->vc_ulcolor = default_underline_color;
2856 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2857 vc->vc_halfcolor = 0x08; /* grey */
2858 init_waitqueue_head(&vc->paste_wait);
2859 reset_terminal(vc, do_clear);
2860}
2861
2862/*
2863 * This routine initializes console interrupts, and does nothing
2864 * else. If you want the screen to clear, call tty_write with
2865 * the appropriate escape-sequence.
2866 */
2867
2868static int __init con_init(void)
2869{
2870 const char *display_desc = NULL;
2871 struct vc_data *vc;
3e795de7 2872 unsigned int currcons = 0, i;
1da177e4 2873
ac751efa 2874 console_lock();
1da177e4
LT		 2875
2876 if (conswitchp)
2877 display_desc = conswitchp->con_startup();
2878 if (!display_desc) {
2879 fg_console = 0;
ac751efa 2880 console_unlock();
1da177e4
LT		 2881 return 0;
2882 }
2883
3e795de7
AD		 2884 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2885 struct con_driver *con_driver = &registered_con_driver[i];
2886
2887 if (con_driver->con == NULL) {
2888 con_driver->con = conswitchp;
2889 con_driver->desc = display_desc;
2890 con_driver->flag = CON_DRIVER_FLAG_INIT;
2891 con_driver->first = 0;
2892 con_driver->last = MAX_NR_CONSOLES - 1;
2893 break;
2894 }
2895 }
2896
2897 for (i = 0; i < MAX_NR_CONSOLES; i++)
2898 con_driver_map[i] = conswitchp;
2899
1da177e4
LT		 2900 if (blankinterval) {
2901 blank_state = blank_normal_wait;
f324edc8 2902 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2903 }
2904
1da177e4 2905 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2906 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2907 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 2908 tty_port_init(&vc->port);
1da177e4 2909 visual_init(vc, currcons, 1);
a5f4f52e 2910 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 2911 vc_init(vc, vc->vc_rows, vc->vc_cols,
2912 currcons || !vc->vc_sw->con_save_screen);
2913 }
2914 currcons = fg_console = 0;
2915 master_display_fg = vc = vc_cons[currcons].d;
2916 set_origin(vc);
2917 save_screen(vc);
2918 gotoxy(vc, vc->vc_x, vc->vc_y);
2919 csi_J(vc, 0);
2920 update_screen(vc);
5da527aa 2921 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 2922 vc->vc_can_do_color ? "colour" : "mono",
2923 display_desc, vc->vc_cols, vc->vc_rows);
2924 printable = 1;
1da177e4 2925
ac751efa 2926 console_unlock();
1da177e4
LT		 2927
2928#ifdef CONFIG_VT_CONSOLE
2929 register_console(&vt_console_driver);
2930#endif
2931 return 0;
2932}
2933console_initcall(con_init);
2934
b68e31d0 2935static const struct tty_operations con_ops = {
bc1e99d9 2936 .install = con_install,
1da177e4
LT		 2937 .open = con_open,
2938 .close = con_close,
2939 .write = con_write,
2940 .write_room = con_write_room,
2941 .put_char = con_put_char,
2942 .flush_chars = con_flush_chars,
2943 .chars_in_buffer = con_chars_in_buffer,
2944 .ioctl = vt_ioctl,
e9216651
AB		 2945#ifdef CONFIG_COMPAT
2946 .compat_ioctl = vt_compat_ioctl,
2947#endif
1da177e4
LT		 2948 .stop = con_stop,
2949 .start = con_start,
2950 .throttle = con_throttle,
2951 .unthrottle = con_unthrottle,
8c9a9dd0 2952 .resize = vt_resize,
feebed65 2953 .shutdown = con_shutdown
1da177e4
LT		 2954};
2955
d81ed103
AC		 2956static struct cdev vc0_cdev;
2957
fbc92a34
KS		 2958static ssize_t show_tty_active(struct device *dev,
2959 struct device_attribute *attr, char *buf)
2960{
2961 return sprintf(buf, "tty%d\n", fg_console + 1);
2962}
2963static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2964
d81ed103 2965int __init vty_init(const struct file_operations *console_fops)
1da177e4 2966{
d81ed103
AC		 2967 cdev_init(&vc0_cdev, console_fops);
2968 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2969 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2970 panic("Couldn't register /dev/tty0 driver\n");
fbc92a34
KS		 2971 tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2972 if (IS_ERR(tty0dev))
2973 tty0dev = NULL;
2974 else
a2a6a822 2975 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
d81ed103 2976
1da177e4
LT		 2977 vcs_init();
2978
2979 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2980 if (!console_driver)
2981 panic("Couldn't allocate console driver\n");
2f16669d 2982
1da177e4
LT		 2983 console_driver->name = "tty";
2984 console_driver->name_base = 1;
2985 console_driver->major = TTY_MAJOR;
2986 console_driver->minor_start = 1;
2987 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2988 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 2989 if (default_utf8)
2990 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 2991 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2992 tty_set_operations(console_driver, &con_ops);
2993 if (tty_register_driver(console_driver))
2994 panic("Couldn't register console driver\n");
1da177e4
LT		 2995 kbd_init();
2996 console_map_init();
1da177e4
LT		 2997#ifdef CONFIG_MDA_CONSOLE
2998 mda_console_init();
2999#endif
3000 return 0;
3001}
3002
3003#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3004
3005static struct class *vtconsole_class;
3006
50e244cc 3007static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3008 int deflt)
1da177e4 3009{
3e795de7
AD		 3010 struct module *owner = csw->owner;
3011 const char *desc = NULL;
3012 struct con_driver *con_driver;
3013 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3014
1da177e4
LT		 3015 if (!try_module_get(owner))
3016 return -ENODEV;
3017
50e244cc 3018 WARN_CONSOLE_UNLOCKED();
1c8ce271 3019
3e795de7
AD		 3020 /* check if driver is registered */
3021 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3022 con_driver = &registered_con_driver[i];
3023
3024 if (con_driver->con == csw) {
3025 desc = con_driver->desc;
3026 retval = 0;
3027 break;
3028 }
3029 }
3030
3031 if (retval)
3032 goto err;
3033
3034 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3035 csw->con_startup();
3036 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3037 }
1c8ce271 3038
1da177e4
LT		 3039 if (deflt) {
3040 if (conswitchp)
3041 module_put(conswitchp->owner);
1c8ce271 3042
1da177e4
LT		 3043 __module_get(owner);
3044 conswitchp = csw;
3045 }
3046
3e795de7
AD		 3047 first = max(first, con_driver->first);
3048 last = min(last, con_driver->last);
3049
1da177e4
LT		 3050 for (i = first; i <= last; i++) {
3051 int old_was_color;
3052 struct vc_data *vc = vc_cons[i].d;
3053
3054 if (con_driver_map[i])
3055 module_put(con_driver_map[i]->owner);
3056 __module_get(owner);
3057 con_driver_map[i] = csw;
3058
3059 if (!vc || !vc->vc_sw)
3060 continue;
3061
3062 j = i;
1c8ce271 3063
4ee1acce
DH		 3064 if (CON_IS_VISIBLE(vc)) {
3065 k = i;
1da177e4 3066 save_screen(vc);
4ee1acce
DH		 3067 }
3068
1da177e4
LT		 3069 old_was_color = vc->vc_can_do_color;
3070 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3071 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3072 visual_init(vc, i, 0);
1c8ce271 3073 set_origin(vc);
1da177e4
LT		 3074 update_attr(vc);
3075
3076 /* If the console changed between mono <-> color, then
3077 * the attributes in the screenbuf will be wrong. The
3078 * following resets all attributes to something sane.
3079 */
3080 if (old_was_color != vc->vc_can_do_color)
3081 clear_buffer_attributes(vc);
1da177e4 3082 }
4ee1acce 3083
1ffdda95 3084 pr_info("Console: switching ");
1da177e4
LT		 3085 if (!deflt)
3086 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3087 if (j >= 0) {
3088 struct vc_data *vc = vc_cons[j].d;
3089
1da177e4 3090 printk("to %s %s %dx%d\n",
4ee1acce
DH		 3091 vc->vc_can_do_color ? "colour" : "mono",
3092 desc, vc->vc_cols, vc->vc_rows);
3093
3094 if (k >= 0) {
3095 vc = vc_cons[k].d;
3096 update_screen(vc);
3097 }
3098 } else
1da177e4
LT		 3099 printk("to %s\n", desc);
3100
3e795de7
AD		 3101 retval = 0;
3102err:
1da177e4 3103 module_put(owner);
3e795de7
AD		 3104 return retval;
3105};
1da177e4 3106
50e244cc 3107
13ae6645
AD		 3108#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3109static int con_is_graphics(const struct consw *csw, int first, int last)
3110{
3111 int i, retval = 0;
3112
3113 for (i = first; i <= last; i++) {
3114 struct vc_data *vc = vc_cons[i].d;
3115
3116 if (vc && vc->vc_mode == KD_GRAPHICS) {
3117 retval = 1;
3118 break;
3119 }
3120 }
3121
3122 return retval;
3123}
3124
e93a9a86
TI		 3125/* unlocked version of unbind_con_driver() */
3126int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3127{
3e795de7
AD		 3128 struct module *owner = csw->owner;
3129 const struct consw *defcsw = NULL;
3130 struct con_driver *con_driver = NULL, *con_back = NULL;
3131 int i, retval = -ENODEV;
1da177e4 3132
3e795de7
AD		 3133 if (!try_module_get(owner))
3134 return -ENODEV;
3135
e93a9a86 3136 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3137
3138 /* check if driver is registered and if it is unbindable */
3139 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3140 con_driver = &registered_con_driver[i];
3141
3142 if (con_driver->con == csw &&
6db4063c 3143 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3144 retval = 0;
3145 break;
3146 }
3147 }
3148
e93a9a86 3149 if (retval)
3e795de7 3150 goto err;
3e795de7 3151
6db4063c
AD		 3152 retval = -ENODEV;
3153
3e795de7
AD		 3154 /* check if backup driver exists */
3155 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3156 con_back = &registered_con_driver[i];
3157
3158 if (con_back->con &&
6db4063c 3159 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3e795de7
AD		 3160 defcsw = con_back->con;
3161 retval = 0;
3162 break;
3163 }
3164 }
3165
e93a9a86 3166 if (retval)
3e795de7 3167 goto err;
3e795de7 3168
e93a9a86 3169 if (!con_is_bound(csw))
3e795de7 3170 goto err;
3e795de7
AD		 3171
3172 first = max(first, con_driver->first);
3173 last = min(last, con_driver->last);
3174
3175 for (i = first; i <= last; i++) {
1da177e4
LT		 3176 if (con_driver_map[i] == csw) {
3177 module_put(csw->owner);
3178 con_driver_map[i] = NULL;
3179 }
3e795de7
AD		 3180 }
3181
3182 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3183 const struct consw *defconsw = conswitchp;
3184
3e795de7
AD		 3185 defcsw->con_startup();
3186 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3187 /*
3188 * vgacon may change the default driver to point
3189 * to dummycon, we restore it here...
3190 */
3191 conswitchp = defconsw;
3e795de7
AD		 3192 }
3193
3194 if (!con_is_bound(csw))
3195 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3196
6db4063c 3197 /* ignore return value, binding should not fail */
50e244cc 3198 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3199err:
3200 module_put(owner);
3201 return retval;
3202
3203}
e93a9a86 3204EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3205
6db4063c
AD		 3206static int vt_bind(struct con_driver *con)
3207{
3208 const struct consw *defcsw = NULL, *csw = NULL;
3209 int i, more = 1, first = -1, last = -1, deflt = 0;
3210
3211 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3212 con_is_graphics(con->con, con->first, con->last))
3213 goto err;
3214
3215 csw = con->con;
3216
3217 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3218 struct con_driver *con = &registered_con_driver[i];
3219
3220 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3221 defcsw = con->con;
3222 break;
3223 }
3224 }
3225
3226 if (!defcsw)
3227 goto err;
3228
3229 while (more) {
3230 more = 0;
3231
3232 for (i = con->first; i <= con->last; i++) {
3233 if (con_driver_map[i] == defcsw) {
3234 if (first == -1)
3235 first = i;
3236 last = i;
3237 more = 1;
3238 } else if (first != -1)
3239 break;
3240 }
3241
3242 if (first == 0 && last == MAX_NR_CONSOLES -1)
3243 deflt = 1;
3244
c62a1e57
WY		 3245 if (first != -1) {
3246 console_lock();
3247 do_bind_con_driver(csw, first, last, deflt);
3248 console_unlock();
3249 }
6db4063c
AD		 3250
3251 first = -1;
3252 last = -1;
3253 deflt = 0;
3254 }
3255
3256err:
3257 return 0;
3258}
3259
3260static int vt_unbind(struct con_driver *con)
3261{
3262 const struct consw *csw = NULL;
3263 int i, more = 1, first = -1, last = -1, deflt = 0;
3264
3265 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3266 con_is_graphics(con->con, con->first, con->last))
3267 goto err;
3268
3269 csw = con->con;
3270
3271 while (more) {
3272 more = 0;
3273
3274 for (i = con->first; i <= con->last; i++) {
3275 if (con_driver_map[i] == csw) {
3276 if (first == -1)
3277 first = i;
3278 last = i;
3279 more = 1;
3280 } else if (first != -1)
3281 break;
3282 }
3283
3284 if (first == 0 && last == MAX_NR_CONSOLES -1)
3285 deflt = 1;
3286
618f2b90
WY		 3287 if (first != -1) {
3288 console_lock();
3289 do_unbind_con_driver(csw, first, last, deflt);
3290 console_unlock();
3291 }
6db4063c
AD		 3292
3293 first = -1;
3294 last = -1;
3295 deflt = 0;
3296 }
3297
3298err:
3299 return 0;
3300}
13ae6645
AD		 3301#else
3302static inline int vt_bind(struct con_driver *con)
3303{
3304 return 0;
3305}
3306static inline int vt_unbind(struct con_driver *con)
3307{
3308 return 0;
3309}
3310#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3311
805952a8 3312static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3313 const char *buf, size_t count)
3314{
805952a8 3315 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3316 int bind = simple_strtoul(buf, NULL, 0);
3317
3318 if (bind)
3319 vt_bind(con);
3320 else
3321 vt_unbind(con);
3322
3323 return count;
3324}
3325
805952a8
GKH		 3326static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3327 char *buf)
6db4063c 3328{
805952a8 3329 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3330 int bind = con_is_bound(con->con);
3331
3332 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3333}
3334
805952a8
GKH		 3335static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3336 char *buf)
6db4063c 3337{
805952a8 3338 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3339
3340 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3341 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3342 con->desc);
3343
3344}
3345
805952a8 3346static struct device_attribute device_attrs[] = {
6db4063c
AD		 3347 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3348 __ATTR(name, S_IRUGO, show_name, NULL),
3349};
3350
805952a8 3351static int vtconsole_init_device(struct con_driver *con)
6db4063c
AD		 3352{
3353 int i;
928e964f 3354 int error = 0;
6db4063c 3355
928e964f 3356 con->flag |= CON_DRIVER_FLAG_ATTR;
805952a8
GKH		 3357 dev_set_drvdata(con->dev, con);
3358 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3359 error = device_create_file(con->dev, &device_attrs[i]);
928e964f
AD		 3360 if (error)
3361 break;
3362 }
6db4063c 3363
928e964f
AD		 3364 if (error) {
3365 while (--i >= 0)
805952a8 3366 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3367 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3368 }
3369
3370 return error;
6db4063c
AD		 3371}
3372
805952a8 3373static void vtconsole_deinit_device(struct con_driver *con)
6db4063c
AD		 3374{
3375 int i;
3376
928e964f 3377 if (con->flag & CON_DRIVER_FLAG_ATTR) {
805952a8
GKH		 3378 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3379 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3380 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3381 }
6db4063c
AD		 3382}
3383
3e795de7
AD		 3384/**
3385 * con_is_bound - checks if driver is bound to the console
3386 * @csw: console driver
3387 *
3388 * RETURNS: zero if unbound, nonzero if bound
3389 *
3390 * Drivers can call this and if zero, they should release
3391 * all resources allocated on con_startup()
3392 */
3393int con_is_bound(const struct consw *csw)
3394{
3395 int i, bound = 0;
3396
3397 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3398 if (con_driver_map[i] == csw) {
3399 bound = 1;
3400 break;
3401 }
3402 }
3403
3404 return bound;
3405}
3406EXPORT_SYMBOL(con_is_bound);
3407
b45cfba4
JB		 3408/**
3409 * con_debug_enter - prepare the console for the kernel debugger
3410 * @sw: console driver
3411 *
3412 * Called when the console is taken over by the kernel debugger, this
3413 * function needs to save the current console state, then put the console
3414 * into a state suitable for the kernel debugger.
3415 *
3416 * RETURNS:
3417 * Zero on success, nonzero if a failure occurred when trying to prepare
3418 * the console for the debugger.
3419 */
3420int con_debug_enter(struct vc_data *vc)
3421{
3422 int ret = 0;
3423
3424 saved_fg_console = fg_console;
3425 saved_last_console = last_console;
3426 saved_want_console = want_console;
3427 saved_vc_mode = vc->vc_mode;
beed5336 3428 saved_console_blanked = console_blanked;
b45cfba4
JB		 3429 vc->vc_mode = KD_TEXT;
3430 console_blanked = 0;
3431 if (vc->vc_sw->con_debug_enter)
3432 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3433#ifdef CONFIG_KGDB_KDB
3434 /* Set the initial LINES variable if it is not already set */
3435 if (vc->vc_rows < 999) {
3436 int linecount;
3437 char lns[4];
3438 const char *setargs[3] = {
3439 "set",
3440 "LINES",
3441 lns,
3442 };
3443 if (kdbgetintenv(setargs[0], &linecount)) {
3444 snprintf(lns, 4, "%i", vc->vc_rows);
3445 kdb_set(2, setargs);
3446 }
3447 }
17b572e8
JW		 3448 if (vc->vc_cols < 999) {
3449 int colcount;
3450 char cols[4];
3451 const char *setargs[3] = {
3452 "set",
3453 "COLUMNS",
3454 cols,
3455 };
3456 if (kdbgetintenv(setargs[0], &colcount)) {
3457 snprintf(cols, 4, "%i", vc->vc_cols);
3458 kdb_set(2, setargs);
3459 }
3460 }
81d44507 3461#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3462 return ret;
3463}
3464EXPORT_SYMBOL_GPL(con_debug_enter);
3465
3466/**
3467 * con_debug_leave - restore console state
3468 * @sw: console driver
3469 *
3470 * Restore the console state to what it was before the kernel debugger
3471 * was invoked.
3472 *
3473 * RETURNS:
3474 * Zero on success, nonzero if a failure occurred when trying to restore
3475 * the console.
3476 */
3477int con_debug_leave(void)
3478{
3479 struct vc_data *vc;
3480 int ret = 0;
3481
3482 fg_console = saved_fg_console;
3483 last_console = saved_last_console;
3484 want_console = saved_want_console;
beed5336 3485 console_blanked = saved_console_blanked;
b45cfba4
JB		 3486 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3487
3488 vc = vc_cons[fg_console].d;
3489 if (vc->vc_sw->con_debug_leave)
3490 ret = vc->vc_sw->con_debug_leave(vc);
3491 return ret;
3492}
3493EXPORT_SYMBOL_GPL(con_debug_leave);
3494
50e244cc 3495static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 3496{
3497 struct module *owner = csw->owner;
3498 struct con_driver *con_driver;
3499 const char *desc;
3500 int i, retval = 0;
3501
50e244cc
AC		 3502 WARN_CONSOLE_UNLOCKED();
3503
3e795de7
AD		 3504 if (!try_module_get(owner))
3505 return -ENODEV;
3506
3e795de7
AD		 3507 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3508 con_driver = &registered_con_driver[i];
3509
3510 /* already registered */
3511 if (con_driver->con == csw)
c55c63c6 3512 retval = -EBUSY;
3e795de7
AD		 3513 }
3514
3515 if (retval)
3516 goto err;
3517
3518 desc = csw->con_startup();
3519
3520 if (!desc)
3521 goto err;
3522
3523 retval = -EINVAL;
3524
3525 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3526 con_driver = &registered_con_driver[i];
3527
3528 if (con_driver->con == NULL) {
3529 con_driver->con = csw;
3530 con_driver->desc = desc;
6db4063c
AD		 3531 con_driver->node = i;
3532 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3533 CON_DRIVER_FLAG_INIT;
3534 con_driver->first = first;
3535 con_driver->last = last;
3536 retval = 0;
3537 break;
3538 }
3539 }
3540
6db4063c
AD		 3541 if (retval)
3542 goto err;
3543
d81ed103 3544 con_driver->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3545 MKDEV(0, con_driver->node),
3546 NULL, "vtcon%i",
3547 con_driver->node);
6db4063c 3548
805952a8
GKH		 3549 if (IS_ERR(con_driver->dev)) {
3550 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3551 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3552 PTR_ERR(con_driver->dev));
3553 con_driver->dev = NULL;
6db4063c 3554 } else {
805952a8 3555 vtconsole_init_device(con_driver);
6db4063c 3556 }
928e964f 3557
3e795de7 3558err:
3e795de7
AD		 3559 module_put(owner);
3560 return retval;
3561}
50e244cc 3562
3e795de7
AD		 3563
3564/**
50539dd4 3565 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 3566 * @csw: console driver
3567 *
3568 * DESCRIPTION: All drivers that registers to the console layer must
3569 * call this function upon exit, or if the console driver is in a state
3570 * where it won't be able to handle console services, such as the
3571 * framebuffer console without loaded framebuffer drivers.
3572 *
3573 * The driver must unbind first prior to unregistration.
3574 */
e93a9a86
TI		 3575int do_unregister_con_driver(const struct consw *csw)
3576{
3577 int i, retval = -ENODEV;
3e795de7
AD		 3578
3579 /* cannot unregister a bound driver */
3580 if (con_is_bound(csw))
3581 goto err;
3582
3583 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3584 struct con_driver *con_driver = &registered_con_driver[i];
3585
3586 if (con_driver->con == csw &&
6db4063c 3587 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
805952a8
GKH		 3588 vtconsole_deinit_device(con_driver);
3589 device_destroy(vtconsole_class,
3590 MKDEV(0, con_driver->node));
3e795de7
AD		 3591 con_driver->con = NULL;
3592 con_driver->desc = NULL;
805952a8 3593 con_driver->dev = NULL;
6db4063c 3594 con_driver->node = 0;
3e795de7
AD		 3595 con_driver->flag = 0;
3596 con_driver->first = 0;
3597 con_driver->last = 0;
3598 retval = 0;
3599 break;
3600 }
3601 }
3e795de7 3602err:
3e795de7
AD		 3603 return retval;
3604}
e93a9a86 3605EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7
AD		 3606
3607/*
3608 * If we support more console drivers, this function is used
3609 * when a driver wants to take over some existing consoles
3610 * and become default driver for newly opened ones.
3611 *
155957f5 3612 * do_take_over_console is basically a register followed by unbind
50e244cc
AC		 3613 */
3614int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3615{
3616 int err;
3617
3618 err = do_register_con_driver(csw, first, last);
3619 /*
3620 * If we get an busy error we still want to bind the console driver
3621 * and return success, as we may have unbound the console driver
3622 * but not unregistered it.
3623 */
3624 if (err == -EBUSY)
3625 err = 0;
3626 if (!err)
3627 do_bind_con_driver(csw, first, last, deflt);
3628
3629 return err;
3630}
3631EXPORT_SYMBOL_GPL(do_take_over_console);
3632
3e795de7
AD		 3633
3634/*
3635 * give_up_console is a wrapper to unregister_con_driver. It will only
3636 * work if driver is fully unbound.
3637 */
3638void give_up_console(const struct consw *csw)
3639{
70125e76
WY		 3640 console_lock();
3641 do_unregister_con_driver(csw);
3642 console_unlock();
3e795de7
AD		 3643}
3644
6db4063c 3645static int __init vtconsole_class_init(void)
3e795de7 3646{
6db4063c 3647 int i;
3e795de7 3648
6db4063c
AD		 3649 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3650 if (IS_ERR(vtconsole_class)) {
3651 printk(KERN_WARNING "Unable to create vt console class; "
3652 "errno = %ld\n", PTR_ERR(vtconsole_class));
3653 vtconsole_class = NULL;
3654 }
3e795de7 3655
6db4063c 3656 /* Add system drivers to sysfs */
3e795de7
AD		 3657 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3658 struct con_driver *con = &registered_con_driver[i];
3659
805952a8 3660 if (con->con && !con->dev) {
d81ed103 3661 con->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3662 MKDEV(0, con->node),
3663 NULL, "vtcon%i",
3664 con->node);
6db4063c 3665
805952a8 3666 if (IS_ERR(con->dev)) {
6db4063c 3667 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3668 "device for %s; errno = %ld\n",
3669 con->desc, PTR_ERR(con->dev));
3670 con->dev = NULL;
6db4063c 3671 } else {
805952a8 3672 vtconsole_init_device(con);
6db4063c 3673 }
3e795de7 3674 }
3e795de7
AD		 3675 }
3676
3e795de7
AD		 3677 return 0;
3678}
6db4063c 3679postcore_initcall(vtconsole_class_init);
3e795de7 3680
1da177e4
LT		 3681#endif
3682
3683/*
3684 * Screen blanking
3685 */
3686
403aac96 3687static int set_vesa_blanking(char __user *p)
1da177e4 3688{
403aac96
YY		 3689 unsigned int mode;
3690
3691 if (get_user(mode, p + 1))
3692 return -EFAULT;
3693
3694 vesa_blank_mode = (mode < 4) ? mode : 0;
3695 return 0;
1da177e4
LT		 3696}
3697
1da177e4
LT		 3698void do_blank_screen(int entering_gfx)
3699{
3700 struct vc_data *vc = vc_cons[fg_console].d;
3701 int i;
3702
3703 WARN_CONSOLE_UNLOCKED();
3704
3705 if (console_blanked) {
3706 if (blank_state == blank_vesa_wait) {
3707 blank_state = blank_off;
d060a321 3708 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3709 }
3710 return;
3711 }
1da177e4
LT		 3712
3713 /* entering graphics mode? */
3714 if (entering_gfx) {
3715 hide_cursor(vc);
3716 save_screen(vc);
3717 vc->vc_sw->con_blank(vc, -1, 1);
3718 console_blanked = fg_console + 1;
b6e8f00f 3719 blank_state = blank_off;
1da177e4
LT		 3720 set_origin(vc);
3721 return;
3722 }
3723
b6e8f00f 3724 if (blank_state != blank_normal_wait)
3725 return;
3726 blank_state = blank_off;
3727
1da177e4
LT		 3728 /* don't blank graphics */
3729 if (vc->vc_mode != KD_TEXT) {
3730 console_blanked = fg_console + 1;
3731 return;
3732 }
3733
3734 hide_cursor(vc);
3735 del_timer_sync(&console_timer);
3736 blank_timer_expired = 0;
3737
3738 save_screen(vc);
3739 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3740 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3741 console_blanked = fg_console + 1;
3742 if (i)
3743 set_origin(vc);
3744
3745 if (console_blank_hook && console_blank_hook(1))
3746 return;
3747
d060a321 3748 if (vesa_off_interval && vesa_blank_mode) {
030babac 3749 blank_state = blank_vesa_wait;
1da177e4
LT		 3750 mod_timer(&console_timer, jiffies + vesa_off_interval);
3751 }
8b92e87d 3752 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3753}
3754EXPORT_SYMBOL(do_blank_screen);
3755
3756/*
3757 * Called by timer as well as from vt_console_driver
3758 */
3759void do_unblank_screen(int leaving_gfx)
3760{
3761 struct vc_data *vc;
3762
3763 /* This should now always be called from a "sane" (read: can schedule)
3764 * context for the sake of the low level drivers, except in the special
3765 * case of oops_in_progress
3766 */
3767 if (!oops_in_progress)
3768 might_sleep();
3769
3770 WARN_CONSOLE_UNLOCKED();
3771
3772 ignore_poke = 0;
3773 if (!console_blanked)
3774 return;
3775 if (!vc_cons_allocated(fg_console)) {
3776 /* impossible */
1ffdda95
MSB		 3777 pr_warning("unblank_screen: tty %d not allocated ??\n",
3778 fg_console+1);
1da177e4
LT		 3779 return;
3780 }
3781 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3782 /* Try to unblank in oops case too */
3783 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3784 return; /* but leave console_blanked != 0 */
3785
3786 if (blankinterval) {
f324edc8 3787 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3788 blank_state = blank_normal_wait;
3789 }
3790
3791 console_blanked = 0;
8fd4bd22 3792 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3793 /* Low-level driver cannot restore -> do it ourselves */
3794 update_screen(vc);
3795 if (console_blank_hook)
3796 console_blank_hook(0);
3797 set_palette(vc);
3798 set_cursor(vc);
8b92e87d 3799 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3800}
3801EXPORT_SYMBOL(do_unblank_screen);
3802
3803/*
3804 * This is called by the outside world to cause a forced unblank, mostly for
3805 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3806 * call it with 1 as an argument and so force a mode restore... that may kill
3807 * X or at least garbage the screen but would also make the Oops visible...
3808 */
3809void unblank_screen(void)
3810{
3811 do_unblank_screen(0);
3812}
3813
3814/*
70522e12 3815 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3816 * (console operations can still happen at irq time, but only from printk which
70522e12 3817 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3818 */
3819static void blank_screen_t(unsigned long dummy)
3820{
cc63b1e1 3821 if (unlikely(!keventd_up())) {
f324edc8 3822 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3823 return;
3824 }
1da177e4
LT		 3825 blank_timer_expired = 1;
3826 schedule_work(&console_work);
3827}
3828
3829void poke_blanked_console(void)
3830{
3831 WARN_CONSOLE_UNLOCKED();
3832
3833 /* Add this so we quickly catch whoever might call us in a non
3834 * safe context. Nowadays, unblank_screen() isn't to be called in
3835 * atomic contexts and is allowed to schedule (with the special case
3836 * of oops_in_progress, but that isn't of any concern for this
3837 * function. --BenH.
3838 */
3839 might_sleep();
3840
3841 /* This isn't perfectly race free, but a race here would be mostly harmless,
3842 * at worse, we'll do a spurrious blank and it's unlikely
3843 */
3844 del_timer(&console_timer);
3845 blank_timer_expired = 0;
3846
3847 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3848 return;
3849 if (console_blanked)
3850 unblank_screen();
3851 else if (blankinterval) {
f324edc8 3852 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3853 blank_state = blank_normal_wait;
3854 }
3855}
3856
3857/*
3858 * Palettes
3859 */
3860
3861static void set_palette(struct vc_data *vc)
3862{
3863 WARN_CONSOLE_UNLOCKED();
3864
3865 if (vc->vc_mode != KD_GRAPHICS)
3866 vc->vc_sw->con_set_palette(vc, color_table);
3867}
3868
1da177e4
LT		 3869/*
3870 * Load palette into the DAC registers. arg points to a colour
3871 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3872 */
3873
3874int con_set_cmap(unsigned char __user *arg)
3875{
871bdea6
MG		 3876 int i, j, k;
3877 unsigned char colormap[3*16];
3878
3879 if (copy_from_user(colormap, arg, sizeof(colormap)))
3880 return -EFAULT;
1da177e4 3881
ac751efa 3882 console_lock();
871bdea6
MG		 3883 for (i = k = 0; i < 16; i++) {
3884 default_red[i] = colormap[k++];
3885 default_grn[i] = colormap[k++];
3886 default_blu[i] = colormap[k++];
3887 }
3888 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3889 if (!vc_cons_allocated(i))
3890 continue;
3891 for (j = k = 0; j < 16; j++) {
3892 vc_cons[i].d->vc_palette[k++] = default_red[j];
3893 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3894 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3895 }
3896 set_palette(vc_cons[i].d);
3897 }
ac751efa 3898 console_unlock();
1da177e4 3899
871bdea6 3900 return 0;
1da177e4
LT		 3901}
3902
3903int con_get_cmap(unsigned char __user *arg)
3904{
871bdea6
MG		 3905 int i, k;
3906 unsigned char colormap[3*16];
1da177e4 3907
ac751efa 3908 console_lock();
871bdea6
MG		 3909 for (i = k = 0; i < 16; i++) {
3910 colormap[k++] = default_red[i];
3911 colormap[k++] = default_grn[i];
3912 colormap[k++] = default_blu[i];
3913 }
ac751efa 3914 console_unlock();
1da177e4 3915
871bdea6
MG		 3916 if (copy_to_user(arg, colormap, sizeof(colormap)))
3917 return -EFAULT;
3918
3919 return 0;
1da177e4
LT		 3920}
3921
3922void reset_palette(struct vc_data *vc)
3923{
3924 int j, k;
3925 for (j=k=0; j<16; j++) {
3926 vc->vc_palette[k++] = default_red[j];
3927 vc->vc_palette[k++] = default_grn[j];
3928 vc->vc_palette[k++] = default_blu[j];
3929 }
3930 set_palette(vc);
3931}
3932
3933/*
3934 * Font switching
3935 *
3936 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3937 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3938 * depending on width) reserved for each character which is kinda wasty, but
3939 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 3940 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 3941 * format (maybe we should add a `fontoffset' field to the `display'
3942 * structure so we won't have to convert the fontdata all the time.
3943 * /Jes
3944 */
3945
3946#define max_font_size 65536
3947
3948static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3949{
3950 struct console_font font;
3951 int rc = -EINVAL;
3952 int c;
3953
1da177e4
LT		 3954 if (op->data) {
3955 font.data = kmalloc(max_font_size, GFP_KERNEL);
3956 if (!font.data)
3957 return -ENOMEM;
3958 } else
3959 font.data = NULL;
3960
ac751efa 3961 console_lock();
edab558f
AC		 3962 if (vc->vc_mode != KD_TEXT)
3963 rc = -EINVAL;
3964 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 3965 rc = vc->vc_sw->con_font_get(vc, &font);
3966 else
3967 rc = -ENOSYS;
ac751efa 3968 console_unlock();
1da177e4
LT		 3969
3970 if (rc)
3971 goto out;
3972
3973 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 3974
1da177e4
LT		 3975 if (op->data && font.charcount > op->charcount)
3976 rc = -ENOSPC;
3977 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3978 if (font.width > op->width || font.height > op->height)
3979 rc = -ENOSPC;
3980 } else {
3981 if (font.width != 8)
3982 rc = -EIO;
3983 else if ((op->height && font.height > op->height) ||
3984 font.height > 32)
3985 rc = -ENOSPC;
3986 }
3987 if (rc)
3988 goto out;
3989
3990 op->height = font.height;
3991 op->width = font.width;
3992 op->charcount = font.charcount;
3993
3994 if (op->data && copy_to_user(op->data, font.data, c))
3995 rc = -EFAULT;
3996
3997out:
3998 kfree(font.data);
3999 return rc;
4000}
4001
4002static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4003{
4004 struct console_font font;
4005 int rc = -EINVAL;
4006 int size;
4007
4008 if (vc->vc_mode != KD_TEXT)
4009 return -EINVAL;
4010 if (!op->data)
4011 return -EINVAL;
4012 if (op->charcount > 512)
4013 return -EINVAL;
4014 if (!op->height) { /* Need to guess font height [compat] */
4015 int h, i;
4016 u8 __user *charmap = op->data;
4017 u8 tmp;
4018
4019 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4020 so that we can get rid of this soon */
4021 if (!(op->flags & KD_FONT_FLAG_OLD))
4022 return -EINVAL;
4023 for (h = 32; h > 0; h--)
4024 for (i = 0; i < op->charcount; i++) {
4025 if (get_user(tmp, &charmap[32*i+h-1]))
4026 return -EFAULT;
4027 if (tmp)
4028 goto nonzero;
4029 }
4030 return -EINVAL;
4031 nonzero:
4032 op->height = h;
4033 }
4034 if (op->width <= 0 || op->width > 32 || op->height > 32)
4035 return -EINVAL;
4036 size = (op->width+7)/8 * 32 * op->charcount;
4037 if (size > max_font_size)
4038 return -ENOSPC;
4039 font.charcount = op->charcount;
4040 font.height = op->height;
4041 font.width = op->width;
9b71ca20
JL		 4042 font.data = memdup_user(op->data, size);
4043 if (IS_ERR(font.data))
4044 return PTR_ERR(font.data);
ac751efa 4045 console_lock();
edab558f
AC		 4046 if (vc->vc_mode != KD_TEXT)
4047 rc = -EINVAL;
4048 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4049 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4050 else
4051 rc = -ENOSYS;
ac751efa 4052 console_unlock();
1da177e4
LT		 4053 kfree(font.data);
4054 return rc;
4055}
4056
4057static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4058{
4059 struct console_font font = {.width = op->width, .height = op->height};
4060 char name[MAX_FONT_NAME];
4061 char *s = name;
4062 int rc;
4063
1da177e4
LT		 4064
4065 if (!op->data)
4066 s = NULL;
4067 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4068 return -EFAULT;
4069 else
4070 name[MAX_FONT_NAME - 1] = 0;
4071
ac751efa 4072 console_lock();
edab558f
AC		 4073 if (vc->vc_mode != KD_TEXT) {
4074 console_unlock();
4075 return -EINVAL;
4076 }
1da177e4
LT		 4077 if (vc->vc_sw->con_font_default)
4078 rc = vc->vc_sw->con_font_default(vc, &font, s);
4079 else
4080 rc = -ENOSYS;
ac751efa 4081 console_unlock();
1da177e4
LT		 4082 if (!rc) {
4083 op->width = font.width;
4084 op->height = font.height;
4085 }
4086 return rc;
4087}
4088
4089static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4090{
4091 int con = op->height;
4092 int rc;
4093
1da177e4 4094
ac751efa 4095 console_lock();
edab558f
AC		 4096 if (vc->vc_mode != KD_TEXT)
4097 rc = -EINVAL;
4098 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4099 rc = -ENOSYS;
4100 else if (con < 0 || !vc_cons_allocated(con))
4101 rc = -ENOTTY;
4102 else if (con == vc->vc_num) /* nothing to do */
4103 rc = 0;
4104 else
4105 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4106 console_unlock();
1da177e4
LT		 4107 return rc;
4108}
4109
4110int con_font_op(struct vc_data *vc, struct console_font_op *op)
4111{
4112 switch (op->op) {
4113 case KD_FONT_OP_SET:
4114 return con_font_set(vc, op);
4115 case KD_FONT_OP_GET:
4116 return con_font_get(vc, op);
4117 case KD_FONT_OP_SET_DEFAULT:
4118 return con_font_default(vc, op);
4119 case KD_FONT_OP_COPY:
4120 return con_font_copy(vc, op);
4121 }
4122 return -ENOSYS;
4123}
4124
4125/*
4126 * Interface exported to selection and vcs.
4127 */
4128
4129/* used by selection */
4130u16 screen_glyph(struct vc_data *vc, int offset)
4131{
4132 u16 w = scr_readw(screenpos(vc, offset, 1));
4133 u16 c = w & 0xff;
4134
4135 if (w & vc->vc_hi_font_mask)
4136 c |= 0x100;
4137 return c;
4138}
f7511d5f 4139EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4140
4141/* used by vcs - note the word offset */
4142unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4143{
4144 return screenpos(vc, 2 * w_offset, viewed);
4145}
4146
4147void getconsxy(struct vc_data *vc, unsigned char *p)
4148{
4149 p[0] = vc->vc_x;
4150 p[1] = vc->vc_y;
4151}
4152
4153void putconsxy(struct vc_data *vc, unsigned char *p)
4154{
9477e260 4155 hide_cursor(vc);
1da177e4
LT		 4156 gotoxy(vc, p[0], p[1]);
4157 set_cursor(vc);
4158}
4159
4160u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4161{
4162 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4163 return softcursor_original;
4164 return scr_readw(org);
4165}
4166
4167void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4168{
4169 scr_writew(val, org);
4170 if ((unsigned long)org == vc->vc_pos) {
4171 softcursor_original = -1;
4172 add_softcursor(vc);
4173 }
4174}
4175
432c9ed2
NP		 4176void vcs_scr_updated(struct vc_data *vc)
4177{
4178 notify_update(vc);
4179}
4180
1da177e4
LT		 4181/*
4182 * Visible symbols for modules
4183 */
4184
4185EXPORT_SYMBOL(color_table);
4186EXPORT_SYMBOL(default_red);
4187EXPORT_SYMBOL(default_grn);
4188EXPORT_SYMBOL(default_blu);
4189EXPORT_SYMBOL(update_region);
4190EXPORT_SYMBOL(redraw_screen);
4191EXPORT_SYMBOL(vc_resize);
4192EXPORT_SYMBOL(fg_console);
4193EXPORT_SYMBOL(console_blank_hook);
4194EXPORT_SYMBOL(console_blanked);
4195EXPORT_SYMBOL(vc_cons);
f6c06b68 4196EXPORT_SYMBOL(global_cursor_default);
1da177e4 4197#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4198EXPORT_SYMBOL(give_up_console);
4199#endif
Linux kernel - Deliverables
This page took 0.99243 seconds and 5 git commands to generate.