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Merge tag 'stable/for-linus-3.9-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel...
[thirdparty/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
b1a925f4 542 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x) * 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
641static void clear_buffer_attributes(struct vc_data *vc)
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 781 if (!vc->vc_screenbuf) {
191c5f10 782 tty_port_destroy(&vc->port);
1da177e4
LT		 783 kfree(vc);
784 vc_cons[currcons].d = NULL;
785 return -ENOMEM;
786 }
f6c06b68
MG		 787
788 /* If no drivers have overridden us and the user didn't pass a
789 boot option, default to displaying the cursor */
790 if (global_cursor_default == -1)
791 global_cursor_default = 1;
792
1da177e4 793 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
4995f8ef 794 vcs_make_sysfs(currcons);
b293d758 795 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1da177e4
LT		 796 }
797 return 0;
798}
799
e400b6ec
AD		 800static inline int resize_screen(struct vc_data *vc, int width, int height,
801 int user)
1da177e4
LT		 802{
803 /* Resizes the resolution of the display adapater */
804 int err = 0;
805
806 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 807 err = vc->vc_sw->con_resize(vc, width, height, user);
808
1da177e4
LT		 809 return err;
810}
811
812/*
813 * Change # of rows and columns (0 means unchanged/the size of fg_console)
814 * [this is to be used together with some user program
815 * like resize that changes the hardware videomode]
816 */
817#define VC_RESIZE_MAXCOL (32767)
818#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 819
820/**
821 * vc_do_resize - resizing method for the tty
822 * @tty: tty being resized
823 * @real_tty: real tty (different to tty if a pty/tty pair)
824 * @vc: virtual console private data
825 * @cols: columns
826 * @lines: lines
827 *
828 * Resize a virtual console, clipping according to the actual constraints.
829 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 830 * information and perform any necessary signal handling.
8c9a9dd0
AC		 831 *
832 * Caller must hold the console semaphore. Takes the termios mutex and
833 * ctrl_lock of the tty IFF a tty is passed.
834 */
835
fc6f6238
AC		 836static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
837 unsigned int cols, unsigned int lines)
1da177e4
LT		 838{
839 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 840 unsigned long end;
f2ee4ae8 841 unsigned int old_rows, old_row_size;
1da177e4 842 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 843 unsigned int user;
1da177e4
LT		 844 unsigned short *newscreen;
845
846 WARN_CONSOLE_UNLOCKED();
847
848 if (!vc)
849 return -ENXIO;
850
e400b6ec
AD		 851 user = vc->vc_resize_user;
852 vc->vc_resize_user = 0;
853
1da177e4
LT		 854 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
855 return -EINVAL;
856
857 new_cols = (cols ? cols : vc->vc_cols);
858 new_rows = (lines ? lines : vc->vc_rows);
859 new_row_size = new_cols << 1;
860 new_screen_size = new_row_size * new_rows;
861
862 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
863 return 0;
864
5cbded58 865 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 866 if (!newscreen)
867 return -ENOMEM;
868
869 old_rows = vc->vc_rows;
1da177e4 870 old_row_size = vc->vc_size_row;
1da177e4 871
e400b6ec 872 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 873 if (err) {
874 kfree(newscreen);
875 return err;
876 }
877
878 vc->vc_rows = new_rows;
879 vc->vc_cols = new_cols;
880 vc->vc_size_row = new_row_size;
881 vc->vc_screenbuf_size = new_screen_size;
882
883 rlth = min(old_row_size, new_row_size);
884 rrem = new_row_size - rlth;
885 old_origin = vc->vc_origin;
886 new_origin = (long) newscreen;
887 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 888
889 if (vc->vc_y > new_rows) {
890 if (old_rows - vc->vc_y < new_rows) {
891 /*
892 * Cursor near the bottom, copy contents from the
893 * bottom of buffer
894 */
895 old_origin += (old_rows - new_rows) * old_row_size;
3b41dc1a
AD		 896 } else {
897 /*
898 * Cursor is in no man's land, copy 1/2 screenful
899 * from the top and bottom of cursor position
900 */
901 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
3b41dc1a 902 }
9fc2b2d0
FJ		 903 }
904
905 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4
LT		 906
907 update_attr(vc);
908
3b41dc1a
AD		 909 while (old_origin < end) {
910 scr_memcpyw((unsigned short *) new_origin,
911 (unsigned short *) old_origin, rlth);
1da177e4 912 if (rrem)
3b41dc1a
AD		 913 scr_memsetw((void *)(new_origin + rlth),
914 vc->vc_video_erase_char, rrem);
1da177e4
LT		 915 old_origin += old_row_size;
916 new_origin += new_row_size;
917 }
918 if (new_scr_end > new_origin)
3b41dc1a
AD		 919 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
920 new_scr_end - new_origin);
5c9228f0 921 kfree(vc->vc_screenbuf);
1da177e4 922 vc->vc_screenbuf = newscreen;
1da177e4
LT		 923 vc->vc_screenbuf_size = new_screen_size;
924 set_origin(vc);
925
926 /* do part of a reset_terminal() */
927 vc->vc_top = 0;
928 vc->vc_bottom = vc->vc_rows;
929 gotoxy(vc, vc->vc_x, vc->vc_y);
930 save_cur(vc);
931
8c9a9dd0
AC		 932 if (tty) {
933 /* Rewrite the requested winsize data with the actual
934 resulting sizes */
935 struct winsize ws;
1da177e4
LT		 936 memset(&ws, 0, sizeof(ws));
937 ws.ws_row = vc->vc_rows;
938 ws.ws_col = vc->vc_cols;
939 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 940 tty_do_resize(tty, &ws);
1da177e4
LT		 941 }
942
943 if (CON_IS_VISIBLE(vc))
944 update_screen(vc);
8b92e87d 945 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 946 return err;
947}
948
8c9a9dd0
AC		 949/**
950 * vc_resize - resize a VT
951 * @vc: virtual console
952 * @cols: columns
953 * @rows: rows
954 *
955 * Resize a virtual console as seen from the console end of things. We
956 * use the common vc_do_resize methods to update the structures. The
957 * caller must hold the console sem to protect console internals and
8ce73264 958 * vc->port.tty
8c9a9dd0
AC		 959 */
960
961int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
962{
8ce73264 963 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 964}
965
966/**
967 * vt_resize - resize a VT
968 * @tty: tty to resize
8c9a9dd0
AC		 969 * @ws: winsize attributes
970 *
971 * Resize a virtual terminal. This is called by the tty layer as we
972 * register our own handler for resizing. The mutual helper does all
973 * the actual work.
974 *
975 * Takes the console sem and the called methods then take the tty
976 * termios_mutex and the tty ctrl_lock in that order.
977 */
da2bdf9a 978static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 979{
8c9a9dd0
AC		 980 struct vc_data *vc = tty->driver_data;
981 int ret;
ca9bda00 982
ac751efa 983 console_lock();
fc6f6238 984 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 985 console_unlock();
8c9a9dd0 986 return ret;
ca9bda00 987}
1da177e4 988
ca9bda00 989void vc_deallocate(unsigned int currcons)
1da177e4
LT		 990{
991 WARN_CONSOLE_UNLOCKED();
992
993 if (vc_cons_allocated(currcons)) {
994 struct vc_data *vc = vc_cons[currcons].d;
b293d758 995 struct vt_notifier_param param = { .vc = vc };
4995f8ef 996
b293d758 997 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 998 vcs_remove_sysfs(currcons);
1da177e4 999 vc->vc_sw->con_deinit(vc);
bde0d2c9 1000 put_pid(vc->vt_pid);
d459ec0b 1001 module_put(vc->vc_sw->owner);
5c9228f0 1002 kfree(vc->vc_screenbuf);
191c5f10
JS		 1003 if (currcons >= MIN_NR_CONSOLES) {
1004 tty_port_destroy(&vc->port);
1da177e4 1005 kfree(vc);
191c5f10 1006 }
1da177e4
LT		 1007 vc_cons[currcons].d = NULL;
1008 }
1009}
1010
1011/*
1012 * VT102 emulator
1013 */
1014
079c9534
AC		 1015#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1016#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1017#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1018
1019#define decarm VC_REPEAT
1020#define decckm VC_CKMODE
1021#define kbdapplic VC_APPLIC
1022#define lnm VC_CRLF
1023
1024/*
1025 * this is what the terminal answers to a ESC-Z or csi0c query.
1026 */
1027#define VT100ID "\033[?1;2c"
1028#define VT102ID "\033[?6c"
1029
1030unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1031 8,12,10,14, 9,13,11,15 };
1032
1033/* the default colour table, for VGA+ colour systems */
1034int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1035 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1036int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1037 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1038int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1039 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1040
1c2bbe6a
JE		 1041module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1042module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1043module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1044
1da177e4
LT		 1045/*
1046 * gotoxy() must verify all boundaries, because the arguments
1047 * might also be negative. If the given position is out of
1048 * bounds, the cursor is placed at the nearest margin.
1049 */
1050static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1051{
1052 int min_y, max_y;
1053
1054 if (new_x < 0)
1055 vc->vc_x = 0;
1056 else {
1057 if (new_x >= vc->vc_cols)
1058 vc->vc_x = vc->vc_cols - 1;
1059 else
1060 vc->vc_x = new_x;
1061 }
1062
1063 if (vc->vc_decom) {
1064 min_y = vc->vc_top;
1065 max_y = vc->vc_bottom;
1066 } else {
1067 min_y = 0;
1068 max_y = vc->vc_rows;
1069 }
1070 if (new_y < min_y)
1071 vc->vc_y = min_y;
1072 else if (new_y >= max_y)
1073 vc->vc_y = max_y - 1;
1074 else
1075 vc->vc_y = new_y;
1076 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1077 vc->vc_need_wrap = 0;
1078}
1079
1080/* for absolute user moves, when decom is set */
1081static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1082{
1083 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1084}
1085
1086void scrollback(struct vc_data *vc, int lines)
1087{
1088 if (!lines)
1089 lines = vc->vc_rows / 2;
1090 scrolldelta(-lines);
1091}
1092
1093void scrollfront(struct vc_data *vc, int lines)
1094{
1095 if (!lines)
1096 lines = vc->vc_rows / 2;
1097 scrolldelta(lines);
1098}
1099
1100static void lf(struct vc_data *vc)
1101{
1102 /* don't scroll if above bottom of scrolling region, or
1103 * if below scrolling region
1104 */
1105 if (vc->vc_y + 1 == vc->vc_bottom)
1106 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1107 else if (vc->vc_y < vc->vc_rows - 1) {
1108 vc->vc_y++;
1109 vc->vc_pos += vc->vc_size_row;
1110 }
1111 vc->vc_need_wrap = 0;
b293d758 1112 notify_write(vc, '\n');
1da177e4
LT		 1113}
1114
1115static void ri(struct vc_data *vc)
1116{
1117 /* don't scroll if below top of scrolling region, or
1118 * if above scrolling region
1119 */
1120 if (vc->vc_y == vc->vc_top)
1121 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1122 else if (vc->vc_y > 0) {
1123 vc->vc_y--;
1124 vc->vc_pos -= vc->vc_size_row;
1125 }
1126 vc->vc_need_wrap = 0;
1127}
1128
1129static inline void cr(struct vc_data *vc)
1130{
1131 vc->vc_pos -= vc->vc_x << 1;
1132 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1133 notify_write(vc, '\r');
1da177e4
LT		 1134}
1135
1136static inline void bs(struct vc_data *vc)
1137{
1138 if (vc->vc_x) {
1139 vc->vc_pos -= 2;
1140 vc->vc_x--;
1141 vc->vc_need_wrap = 0;
b293d758 1142 notify_write(vc, '\b');
1da177e4
LT		 1143 }
1144}
1145
1146static inline void del(struct vc_data *vc)
1147{
1148 /* ignored */
1149}
1150
1151static void csi_J(struct vc_data *vc, int vpar)
1152{
1153 unsigned int count;
1154 unsigned short * start;
1155
1156 switch (vpar) {
1157 case 0: /* erase from cursor to end of display */
1158 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1159 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1160 break;
1161 case 1: /* erase from start to cursor */
1162 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1163 start = (unsigned short *)vc->vc_origin;
1da177e4 1164 break;
f8df13e0
PP		 1165 case 3: /* erase scroll-back buffer (and whole display) */
1166 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1167 vc->vc_screenbuf_size >> 1);
1168 set_origin(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;
1305 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1306 * Enables underscore, white foreground
1307 * with white underscore (Linux - use
1308 * default foreground).
1309 */
1310 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1311 vc->vc_underline = 1;
1312 break;
1313 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1314 * Disable underline option.
1315 * Reset colour to default? It did this
1316 * before...
1317 */
1318 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1319 vc->vc_underline = 0;
1320 break;
1321 case 49:
1322 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1323 break;
1324 default:
1325 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1326 vc->vc_color = color_table[vc->vc_par[i] - 30]
1327 | (vc->vc_color & 0xf0);
1328 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1329 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1330 | (vc->vc_color & 0x0f);
1331 break;
1332 }
1333 update_attr(vc);
1334}
1335
6732c8bb 1336static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1337{
1338 while (*p) {
6732c8bb 1339 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1340 p++;
1341 }
6732c8bb 1342 tty_schedule_flip(port);
1da177e4
LT		 1343}
1344
1345static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1346{
1347 char buf[40];
1348
1349 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1350 respond_string(buf, tty->port);
1da177e4
LT		 1351}
1352
1353static inline void status_report(struct tty_struct *tty)
1354{
6732c8bb 1355 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1356}
1357
6732c8bb 1358static inline void respond_ID(struct tty_struct *tty)
1da177e4 1359{
6732c8bb 1360 respond_string(VT102ID, tty->port);
1da177e4
LT		 1361}
1362
1363void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1364{
1365 char buf[8];
1366
1367 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1368 (char)('!' + mry));
6732c8bb 1369 respond_string(buf, tty->port);
1da177e4
LT		 1370}
1371
1372/* invoked via ioctl(TIOCLINUX) and through set_selection */
1373int mouse_reporting(void)
1374{
1375 return vc_cons[fg_console].d->vc_report_mouse;
1376}
1377
ac751efa 1378/* console_lock is held */
1da177e4
LT		 1379static void set_mode(struct vc_data *vc, int on_off)
1380{
1381 int i;
1382
1383 for (i = 0; i <= vc->vc_npar; i++)
1384 if (vc->vc_ques) {
1385 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1386 case 1: /* Cursor keys send ^[Ox/^[[x */
1387 if (on_off)
1388 set_kbd(vc, decckm);
1389 else
1390 clr_kbd(vc, decckm);
1391 break;
1392 case 3: /* 80/132 mode switch unimplemented */
1393 vc->vc_deccolm = on_off;
1394#if 0
1395 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1396 /* this alone does not suffice; some user mode
1397 utility has to change the hardware regs */
1398#endif
1399 break;
1400 case 5: /* Inverted screen on/off */
1401 if (vc->vc_decscnm != on_off) {
1402 vc->vc_decscnm = on_off;
1403 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1404 update_attr(vc);
1405 }
1406 break;
1407 case 6: /* Origin relative/absolute */
1408 vc->vc_decom = on_off;
1409 gotoxay(vc, 0, 0);
1410 break;
1411 case 7: /* Autowrap on/off */
1412 vc->vc_decawm = on_off;
1413 break;
1414 case 8: /* Autorepeat on/off */
1415 if (on_off)
1416 set_kbd(vc, decarm);
1417 else
1418 clr_kbd(vc, decarm);
1419 break;
1420 case 9:
1421 vc->vc_report_mouse = on_off ? 1 : 0;
1422 break;
1423 case 25: /* Cursor on/off */
1424 vc->vc_deccm = on_off;
1425 break;
1426 case 1000:
1427 vc->vc_report_mouse = on_off ? 2 : 0;
1428 break;
1429 }
1430 } else {
1431 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1432 case 3: /* Monitor (display ctrls) */
1433 vc->vc_disp_ctrl = on_off;
1434 break;
1435 case 4: /* Insert Mode on/off */
1436 vc->vc_decim = on_off;
1437 break;
1438 case 20: /* Lf, Enter == CrLf/Lf */
1439 if (on_off)
1440 set_kbd(vc, lnm);
1441 else
1442 clr_kbd(vc, lnm);
1443 break;
1444 }
1445 }
1446}
1447
ac751efa 1448/* console_lock is held */
1da177e4
LT		 1449static void setterm_command(struct vc_data *vc)
1450{
1451 switch(vc->vc_par[0]) {
1452 case 1: /* set color for underline mode */
1453 if (vc->vc_can_do_color &&
1454 vc->vc_par[1] < 16) {
1455 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1456 if (vc->vc_underline)
1457 update_attr(vc);
1458 }
1459 break;
1460 case 2: /* set color for half intensity mode */
1461 if (vc->vc_can_do_color &&
1462 vc->vc_par[1] < 16) {
1463 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1464 if (vc->vc_intensity == 0)
1465 update_attr(vc);
1466 }
1467 break;
1468 case 8: /* store colors as defaults */
1469 vc->vc_def_color = vc->vc_attr;
1470 if (vc->vc_hi_font_mask == 0x100)
1471 vc->vc_def_color >>= 1;
1472 default_attr(vc);
1473 update_attr(vc);
1474 break;
1475 case 9: /* set blanking interval */
f324edc8 1476 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1477 poke_blanked_console();
1478 break;
1479 case 10: /* set bell frequency in Hz */
1480 if (vc->vc_npar >= 1)
1481 vc->vc_bell_pitch = vc->vc_par[1];
1482 else
1483 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1484 break;
1485 case 11: /* set bell duration in msec */
1486 if (vc->vc_npar >= 1)
1487 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1488 vc->vc_par[1] * HZ / 1000 : 0;
1489 else
1490 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1491 break;
1492 case 12: /* bring specified console to the front */
1493 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1494 set_console(vc->vc_par[1] - 1);
1495 break;
1496 case 13: /* unblank the screen */
1497 poke_blanked_console();
1498 break;
1499 case 14: /* set vesa powerdown interval */
1500 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1501 break;
1502 case 15: /* activate the previous console */
1503 set_console(last_console);
1504 break;
1505 }
1506}
1507
ac751efa 1508/* console_lock is held */
1da177e4
LT		 1509static void csi_at(struct vc_data *vc, unsigned int nr)
1510{
1511 if (nr > vc->vc_cols - vc->vc_x)
1512 nr = vc->vc_cols - vc->vc_x;
1513 else if (!nr)
1514 nr = 1;
1515 insert_char(vc, nr);
1516}
1517
ac751efa 1518/* console_lock is held */
1da177e4
LT		 1519static void csi_L(struct vc_data *vc, unsigned int nr)
1520{
1521 if (nr > vc->vc_rows - vc->vc_y)
1522 nr = vc->vc_rows - vc->vc_y;
1523 else if (!nr)
1524 nr = 1;
1525 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1526 vc->vc_need_wrap = 0;
1527}
1528
ac751efa 1529/* console_lock is held */
1da177e4
LT		 1530static void csi_P(struct vc_data *vc, unsigned int nr)
1531{
1532 if (nr > vc->vc_cols - vc->vc_x)
1533 nr = vc->vc_cols - vc->vc_x;
1534 else if (!nr)
1535 nr = 1;
1536 delete_char(vc, nr);
1537}
1538
ac751efa 1539/* console_lock is held */
1da177e4
LT		 1540static void csi_M(struct vc_data *vc, unsigned int nr)
1541{
1542 if (nr > vc->vc_rows - vc->vc_y)
1543 nr = vc->vc_rows - vc->vc_y;
1544 else if (!nr)
1545 nr=1;
1546 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1547 vc->vc_need_wrap = 0;
1548}
1549
ac751efa 1550/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1551static void save_cur(struct vc_data *vc)
1552{
1553 vc->vc_saved_x = vc->vc_x;
1554 vc->vc_saved_y = vc->vc_y;
1555 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1556 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1557 vc->vc_s_underline = vc->vc_underline;
1558 vc->vc_s_blink = vc->vc_blink;
1559 vc->vc_s_reverse = vc->vc_reverse;
1560 vc->vc_s_charset = vc->vc_charset;
1561 vc->vc_s_color = vc->vc_color;
1562 vc->vc_saved_G0 = vc->vc_G0_charset;
1563 vc->vc_saved_G1 = vc->vc_G1_charset;
1564}
1565
ac751efa 1566/* console_lock is held */
1da177e4
LT		 1567static void restore_cur(struct vc_data *vc)
1568{
1569 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1570 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1571 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1572 vc->vc_underline = vc->vc_s_underline;
1573 vc->vc_blink = vc->vc_s_blink;
1574 vc->vc_reverse = vc->vc_s_reverse;
1575 vc->vc_charset = vc->vc_s_charset;
1576 vc->vc_color = vc->vc_s_color;
1577 vc->vc_G0_charset = vc->vc_saved_G0;
1578 vc->vc_G1_charset = vc->vc_saved_G1;
1579 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1580 update_attr(vc);
1581 vc->vc_need_wrap = 0;
1582}
1583
1584enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1585 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1586 ESpalette };
1587
ac751efa 1588/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1589static void reset_terminal(struct vc_data *vc, int do_clear)
1590{
1591 vc->vc_top = 0;
1592 vc->vc_bottom = vc->vc_rows;
1593 vc->vc_state = ESnormal;
1594 vc->vc_ques = 0;
1595 vc->vc_translate = set_translate(LAT1_MAP, vc);
1596 vc->vc_G0_charset = LAT1_MAP;
1597 vc->vc_G1_charset = GRAF_MAP;
1598 vc->vc_charset = 0;
1599 vc->vc_need_wrap = 0;
1600 vc->vc_report_mouse = 0;
042f10ec 1601 vc->vc_utf = default_utf8;
1da177e4
LT		 1602 vc->vc_utf_count = 0;
1603
1604 vc->vc_disp_ctrl = 0;
1605 vc->vc_toggle_meta = 0;
1606
1607 vc->vc_decscnm = 0;
1608 vc->vc_decom = 0;
1609 vc->vc_decawm = 1;
f6c06b68 1610 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1611 vc->vc_decim = 0;
1612
079c9534 1613 vt_reset_keyboard(vc->vc_num);
1da177e4 1614
9ea9a886 1615 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1616 vc->vc_complement_mask = vc->vc_s_complement_mask;
1617
1618 default_attr(vc);
1619 update_attr(vc);
1620
1621 vc->vc_tab_stop[0] = 0x01010100;
1622 vc->vc_tab_stop[1] =
1623 vc->vc_tab_stop[2] =
1624 vc->vc_tab_stop[3] =
a564738c
WK		 1625 vc->vc_tab_stop[4] =
1626 vc->vc_tab_stop[5] =
1627 vc->vc_tab_stop[6] =
1628 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1629
1630 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1631 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1632
1633 gotoxy(vc, 0, 0);
1634 save_cur(vc);
1635 if (do_clear)
1636 csi_J(vc, 2);
1637}
1638
ac751efa 1639/* console_lock is held */
1da177e4
LT		 1640static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1641{
1642 /*
1643 * Control characters can be used in the _middle_
1644 * of an escape sequence.
1645 */
1646 switch (c) {
1647 case 0:
1648 return;
1649 case 7:
1650 if (vc->vc_bell_duration)
1651 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1652 return;
1653 case 8:
1654 bs(vc);
1655 return;
1656 case 9:
1657 vc->vc_pos -= (vc->vc_x << 1);
1658 while (vc->vc_x < vc->vc_cols - 1) {
1659 vc->vc_x++;
1660 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1661 break;
1662 }
1663 vc->vc_pos += (vc->vc_x << 1);
b293d758 1664 notify_write(vc, '\t');
1da177e4
LT		 1665 return;
1666 case 10: case 11: case 12:
1667 lf(vc);
1668 if (!is_kbd(vc, lnm))
1669 return;
1670 case 13:
1671 cr(vc);
1672 return;
1673 case 14:
1674 vc->vc_charset = 1;
1675 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1676 vc->vc_disp_ctrl = 1;
1677 return;
1678 case 15:
1679 vc->vc_charset = 0;
1680 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1681 vc->vc_disp_ctrl = 0;
1682 return;
1683 case 24: case 26:
1684 vc->vc_state = ESnormal;
1685 return;
1686 case 27:
1687 vc->vc_state = ESesc;
1688 return;
1689 case 127:
1690 del(vc);
1691 return;
1692 case 128+27:
1693 vc->vc_state = ESsquare;
1694 return;
1695 }
1696 switch(vc->vc_state) {
1697 case ESesc:
1698 vc->vc_state = ESnormal;
1699 switch (c) {
1700 case '[':
1701 vc->vc_state = ESsquare;
1702 return;
1703 case ']':
1704 vc->vc_state = ESnonstd;
1705 return;
1706 case '%':
1707 vc->vc_state = ESpercent;
1708 return;
1709 case 'E':
1710 cr(vc);
1711 lf(vc);
1712 return;
1713 case 'M':
1714 ri(vc);
1715 return;
1716 case 'D':
1717 lf(vc);
1718 return;
1719 case 'H':
1720 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1721 return;
1722 case 'Z':
1723 respond_ID(tty);
1724 return;
1725 case '7':
1726 save_cur(vc);
1727 return;
1728 case '8':
1729 restore_cur(vc);
1730 return;
1731 case '(':
1732 vc->vc_state = ESsetG0;
1733 return;
1734 case ')':
1735 vc->vc_state = ESsetG1;
1736 return;
1737 case '#':
1738 vc->vc_state = EShash;
1739 return;
1740 case 'c':
1741 reset_terminal(vc, 1);
1742 return;
1743 case '>': /* Numeric keypad */
1744 clr_kbd(vc, kbdapplic);
1745 return;
1746 case '=': /* Appl. keypad */
1747 set_kbd(vc, kbdapplic);
1748 return;
1749 }
1750 return;
1751 case ESnonstd:
1752 if (c=='P') { /* palette escape sequence */
1753 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1754 vc->vc_par[vc->vc_npar] = 0;
1755 vc->vc_npar = 0;
1756 vc->vc_state = ESpalette;
1757 return;
1758 } else if (c=='R') { /* reset palette */
1759 reset_palette(vc);
1760 vc->vc_state = ESnormal;
1761 } else
1762 vc->vc_state = ESnormal;
1763 return;
1764 case ESpalette:
74c807ce
AS		 1765 if (isxdigit(c)) {
1766 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1767 if (vc->vc_npar == 7) {
1768 int i = vc->vc_par[0] * 3, j = 1;
1769 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1770 vc->vc_palette[i++] += vc->vc_par[j++];
1771 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1772 vc->vc_palette[i++] += vc->vc_par[j++];
1773 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1774 vc->vc_palette[i] += vc->vc_par[j];
1775 set_palette(vc);
1776 vc->vc_state = ESnormal;
1777 }
1778 } else
1779 vc->vc_state = ESnormal;
1780 return;
1781 case ESsquare:
1782 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1783 vc->vc_par[vc->vc_npar] = 0;
1784 vc->vc_npar = 0;
1785 vc->vc_state = ESgetpars;
1786 if (c == '[') { /* Function key */
1787 vc->vc_state=ESfunckey;
1788 return;
1789 }
1790 vc->vc_ques = (c == '?');
1791 if (vc->vc_ques)
1792 return;
1793 case ESgetpars:
1794 if (c == ';' && vc->vc_npar < NPAR - 1) {
1795 vc->vc_npar++;
1796 return;
1797 } else if (c>='0' && c<='9') {
1798 vc->vc_par[vc->vc_npar] *= 10;
1799 vc->vc_par[vc->vc_npar] += c - '0';
1800 return;
1801 } else
1802 vc->vc_state = ESgotpars;
1803 case ESgotpars:
1804 vc->vc_state = ESnormal;
1805 switch(c) {
1806 case 'h':
1807 set_mode(vc, 1);
1808 return;
1809 case 'l':
1810 set_mode(vc, 0);
1811 return;
1812 case 'c':
1813 if (vc->vc_ques) {
1814 if (vc->vc_par[0])
1815 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1816 else
9ea9a886 1817 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1818 return;
1819 }
1820 break;
1821 case 'm':
1822 if (vc->vc_ques) {
1823 clear_selection();
1824 if (vc->vc_par[0])
1825 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1826 else
1827 vc->vc_complement_mask = vc->vc_s_complement_mask;
1828 return;
1829 }
1830 break;
1831 case 'n':
1832 if (!vc->vc_ques) {
1833 if (vc->vc_par[0] == 5)
1834 status_report(tty);
1835 else if (vc->vc_par[0] == 6)
1836 cursor_report(vc, tty);
1837 }
1838 return;
1839 }
1840 if (vc->vc_ques) {
1841 vc->vc_ques = 0;
1842 return;
1843 }
1844 switch(c) {
1845 case 'G': case '`':
1846 if (vc->vc_par[0])
1847 vc->vc_par[0]--;
1848 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1849 return;
1850 case 'A':
1851 if (!vc->vc_par[0])
1852 vc->vc_par[0]++;
1853 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1854 return;
1855 case 'B': case 'e':
1856 if (!vc->vc_par[0])
1857 vc->vc_par[0]++;
1858 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1859 return;
1860 case 'C': case 'a':
1861 if (!vc->vc_par[0])
1862 vc->vc_par[0]++;
1863 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1864 return;
1865 case 'D':
1866 if (!vc->vc_par[0])
1867 vc->vc_par[0]++;
1868 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1869 return;
1870 case 'E':
1871 if (!vc->vc_par[0])
1872 vc->vc_par[0]++;
1873 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1874 return;
1875 case 'F':
1876 if (!vc->vc_par[0])
1877 vc->vc_par[0]++;
1878 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1879 return;
1880 case 'd':
1881 if (vc->vc_par[0])
1882 vc->vc_par[0]--;
1883 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1884 return;
1885 case 'H': case 'f':
1886 if (vc->vc_par[0])
1887 vc->vc_par[0]--;
1888 if (vc->vc_par[1])
1889 vc->vc_par[1]--;
1890 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1891 return;
1892 case 'J':
1893 csi_J(vc, vc->vc_par[0]);
1894 return;
1895 case 'K':
1896 csi_K(vc, vc->vc_par[0]);
1897 return;
1898 case 'L':
1899 csi_L(vc, vc->vc_par[0]);
1900 return;
1901 case 'M':
1902 csi_M(vc, vc->vc_par[0]);
1903 return;
1904 case 'P':
1905 csi_P(vc, vc->vc_par[0]);
1906 return;
1907 case 'c':
1908 if (!vc->vc_par[0])
1909 respond_ID(tty);
1910 return;
1911 case 'g':
1912 if (!vc->vc_par[0])
1913 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1914 else if (vc->vc_par[0] == 3) {
1915 vc->vc_tab_stop[0] =
1916 vc->vc_tab_stop[1] =
1917 vc->vc_tab_stop[2] =
1918 vc->vc_tab_stop[3] =
a564738c
WK		 1919 vc->vc_tab_stop[4] =
1920 vc->vc_tab_stop[5] =
1921 vc->vc_tab_stop[6] =
1922 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 1923 }
1924 return;
1925 case 'm':
1926 csi_m(vc);
1927 return;
1928 case 'q': /* DECLL - but only 3 leds */
1929 /* map 0,1,2,3 to 0,1,2,4 */
1930 if (vc->vc_par[0] < 4)
079c9534 1931 vt_set_led_state(vc->vc_num,
1da177e4
LT		 1932 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1933 return;
1934 case 'r':
1935 if (!vc->vc_par[0])
1936 vc->vc_par[0]++;
1937 if (!vc->vc_par[1])
1938 vc->vc_par[1] = vc->vc_rows;
1939 /* Minimum allowed region is 2 lines */
1940 if (vc->vc_par[0] < vc->vc_par[1] &&
1941 vc->vc_par[1] <= vc->vc_rows) {
1942 vc->vc_top = vc->vc_par[0] - 1;
1943 vc->vc_bottom = vc->vc_par[1];
1944 gotoxay(vc, 0, 0);
1945 }
1946 return;
1947 case 's':
1948 save_cur(vc);
1949 return;
1950 case 'u':
1951 restore_cur(vc);
1952 return;
1953 case 'X':
1954 csi_X(vc, vc->vc_par[0]);
1955 return;
1956 case '@':
1957 csi_at(vc, vc->vc_par[0]);
1958 return;
1959 case ']': /* setterm functions */
1960 setterm_command(vc);
1961 return;
1962 }
1963 return;
1964 case ESpercent:
1965 vc->vc_state = ESnormal;
1966 switch (c) {
1967 case '@': /* defined in ISO 2022 */
1968 vc->vc_utf = 0;
1969 return;
1970 case 'G': /* prelim official escape code */
1971 case '8': /* retained for compatibility */
1972 vc->vc_utf = 1;
1973 return;
1974 }
1975 return;
1976 case ESfunckey:
1977 vc->vc_state = ESnormal;
1978 return;
1979 case EShash:
1980 vc->vc_state = ESnormal;
1981 if (c == '8') {
1982 /* DEC screen alignment test. kludge :-) */
1983 vc->vc_video_erase_char =
1984 (vc->vc_video_erase_char & 0xff00) | 'E';
1985 csi_J(vc, 2);
1986 vc->vc_video_erase_char =
1987 (vc->vc_video_erase_char & 0xff00) | ' ';
1988 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1989 }
1990 return;
1991 case ESsetG0:
1992 if (c == '0')
1993 vc->vc_G0_charset = GRAF_MAP;
1994 else if (c == 'B')
1995 vc->vc_G0_charset = LAT1_MAP;
1996 else if (c == 'U')
1997 vc->vc_G0_charset = IBMPC_MAP;
1998 else if (c == 'K')
1999 vc->vc_G0_charset = USER_MAP;
2000 if (vc->vc_charset == 0)
2001 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2002 vc->vc_state = ESnormal;
2003 return;
2004 case ESsetG1:
2005 if (c == '0')
2006 vc->vc_G1_charset = GRAF_MAP;
2007 else if (c == 'B')
2008 vc->vc_G1_charset = LAT1_MAP;
2009 else if (c == 'U')
2010 vc->vc_G1_charset = IBMPC_MAP;
2011 else if (c == 'K')
2012 vc->vc_G1_charset = USER_MAP;
2013 if (vc->vc_charset == 1)
2014 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2015 vc->vc_state = ESnormal;
2016 return;
2017 default:
2018 vc->vc_state = ESnormal;
2019 }
2020}
2021
2f1a2ccb 2022/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2023 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2024 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2025 */
2026struct interval {
2027 uint32_t first;
2028 uint32_t last;
2029};
2030
2031static int bisearch(uint32_t ucs, const struct interval *table, int max)
2032{
2033 int min = 0;
2034 int mid;
2035
2036 if (ucs < table[0].first || ucs > table[max].last)
2037 return 0;
2038 while (max >= min) {
2039 mid = (min + max) / 2;
2040 if (ucs > table[mid].last)
2041 min = mid + 1;
2042 else if (ucs < table[mid].first)
2043 max = mid - 1;
2044 else
2045 return 1;
2046 }
2047 return 0;
2048}
2049
2050static int is_double_width(uint32_t ucs)
2051{
2052 static const struct interval double_width[] = {
2053 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2054 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2055 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2056 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2057 };
0f11541b 2058 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2059}
2060
ac751efa 2061/* acquires console_lock */
1da177e4
LT		 2062static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2063{
2064#ifdef VT_BUF_VRAM_ONLY
2065#define FLUSH do { } while(0);
2066#else
2067#define FLUSH if (draw_x >= 0) { \
2068 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2069 draw_x = -1; \
2070 }
2071#endif
2072
2073 int c, tc, ok, n = 0, draw_x = -1;
2074 unsigned int currcons;
2075 unsigned long draw_from = 0, draw_to = 0;
2076 struct vc_data *vc;
2f1a2ccb 2077 unsigned char vc_attr;
0341a4d0 2078 struct vt_notifier_param param;
2f1a2ccb
EK		 2079 uint8_t rescan;
2080 uint8_t inverse;
2081 uint8_t width;
1da177e4 2082 u16 himask, charmask;
1da177e4
LT		 2083
2084 if (in_interrupt())
2085 return count;
2086
2087 might_sleep();
2088
ac751efa 2089 console_lock();
1da177e4
LT		 2090 vc = tty->driver_data;
2091 if (vc == NULL) {
2092 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2093 console_unlock();
1da177e4
LT		 2094 return 0;
2095 }
2096
2097 currcons = vc->vc_num;
2098 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2099 /* could this happen? */
2100 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2101 console_unlock();
2102 return 0;
1da177e4 2103 }
1da177e4 2104
1da177e4
LT		 2105 himask = vc->vc_hi_font_mask;
2106 charmask = himask ? 0x1ff : 0xff;
2107
2108 /* undraw cursor first */
2109 if (IS_FG(vc))
2110 hide_cursor(vc);
2111
0341a4d0
KD		 2112 param.vc = vc;
2113
1da177e4
LT		 2114 while (!tty->stopped && count) {
2115 int orig = *buf;
2116 c = orig;
2117 buf++;
2118 n++;
2119 count--;
2f1a2ccb
EK		 2120 rescan = 0;
2121 inverse = 0;
2122 width = 1;
1da177e4
LT		 2123
2124 /* Do no translation at all in control states */
2125 if (vc->vc_state != ESnormal) {
2126 tc = c;
d4328b40 2127 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2128 /* Combine UTF-8 into Unicode in vc_utf_char.
2129 * vc_utf_count is the number of continuation bytes still
2130 * expected to arrive.
2131 * vc_npar is the number of continuation bytes arrived so
2132 * far
2133 */
d4328b40 2134rescan_last_byte:
2f1a2ccb
EK		 2135 if ((c & 0xc0) == 0x80) {
2136 /* Continuation byte received */
2137 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2138 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2139 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2140 vc->vc_npar++;
2141 if (--vc->vc_utf_count) {
2142 /* Still need some bytes */
1da177e4 2143 continue;
2f1a2ccb
EK		 2144 }
2145 /* Got a whole character */
2146 c = vc->vc_utf_char;
2147 /* Reject overlong sequences */
2148 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2149 c > utf8_length_changes[vc->vc_npar])
2150 c = 0xfffd;
2151 } else {
2152 /* Unexpected continuation byte */
2153 vc->vc_utf_count = 0;
2154 c = 0xfffd;
2155 }
1da177e4 2156 } else {
2f1a2ccb
EK		 2157 /* Single ASCII byte or first byte of a sequence received */
2158 if (vc->vc_utf_count) {
2159 /* Continuation byte expected */
2160 rescan = 1;
2161 vc->vc_utf_count = 0;
2162 c = 0xfffd;
2163 } else if (c > 0x7f) {
2164 /* First byte of a multibyte sequence received */
2165 vc->vc_npar = 0;
2166 if ((c & 0xe0) == 0xc0) {
2167 vc->vc_utf_count = 1;
2168 vc->vc_utf_char = (c & 0x1f);
2169 } else if ((c & 0xf0) == 0xe0) {
2170 vc->vc_utf_count = 2;
2171 vc->vc_utf_char = (c & 0x0f);
2172 } else if ((c & 0xf8) == 0xf0) {
2173 vc->vc_utf_count = 3;
2174 vc->vc_utf_char = (c & 0x07);
2175 } else if ((c & 0xfc) == 0xf8) {
2176 vc->vc_utf_count = 4;
2177 vc->vc_utf_char = (c & 0x03);
2178 } else if ((c & 0xfe) == 0xfc) {
2179 vc->vc_utf_count = 5;
2180 vc->vc_utf_char = (c & 0x01);
2181 } else {
2182 /* 254 and 255 are invalid */
2183 c = 0xfffd;
2184 }
2185 if (vc->vc_utf_count) {
2186 /* Still need some bytes */
2187 continue;
2188 }
2189 }
2190 /* Nothing to do if an ASCII byte was received */
1da177e4 2191 }
2f1a2ccb
EK		 2192 /* End of UTF-8 decoding. */
2193 /* c is the received character, or U+FFFD for invalid sequences. */
2194 /* Replace invalid Unicode code points with U+FFFD too */
2195 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2196 c = 0xfffd;
2197 tc = c;
d4328b40 2198 } else { /* no utf or alternate charset mode */
a29ccf6f 2199 tc = vc_translate(vc, c);
1da177e4
LT		 2200 }
2201
0341a4d0
KD		 2202 param.c = tc;
2203 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2204 &param) == NOTIFY_STOP)
2205 continue;
2206
1da177e4
LT		 2207 /* If the original code was a control character we
2208 * only allow a glyph to be displayed if the code is
2209 * not normally used (such as for cursor movement) or
2210 * if the disp_ctrl mode has been explicitly enabled.
2211 * Certain characters (as given by the CTRL_ALWAYS
2212 * bitmap) are always displayed as control characters,
2213 * as the console would be pretty useless without
2214 * them; to display an arbitrary font position use the
2215 * direct-to-font zone in UTF-8 mode.
2216 */
2217 ok = tc && (c >= 32 ||
d4328b40
AT		 2218 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2219 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2220 && (c != 127 || vc->vc_disp_ctrl)
2221 && (c != 128+27);
2222
2223 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2224 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2225 if (is_double_width(c))
2226 width = 2;
2227 }
1da177e4
LT		 2228 /* Now try to find out how to display it */
2229 tc = conv_uni_to_pc(vc, tc);
d4328b40 2230 if (tc & ~charmask) {
2f1a2ccb
EK		 2231 if (tc == -1 || tc == -2) {
2232 continue; /* nothing to display */
2233 }
2234 /* Glyph not found */
c0b79882 2235 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2236 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2237 This would make absolutely no sense with Unicode in mind,
2238 but do this for ASCII characters since a font may lack
2239 Unicode mapping info and we don't want to end up with
2240 having question marks only. */
2f1a2ccb
EK		 2241 tc = c;
2242 } else {
2243 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2244 tc = conv_uni_to_pc(vc, 0xfffd);
2245 if (tc < 0) {
2246 inverse = 1;
2247 tc = conv_uni_to_pc(vc, '?');
2248 if (tc < 0) tc = '?';
2249 }
2250 }
d4328b40 2251 }
1da177e4 2252
2f1a2ccb
EK		 2253 if (!inverse) {
2254 vc_attr = vc->vc_attr;
1da177e4 2255 } else {
2f1a2ccb
EK		 2256 /* invert vc_attr */
2257 if (!vc->vc_can_do_color) {
2258 vc_attr = (vc->vc_attr) ^ 0x08;
2259 } else if (vc->vc_hi_font_mask == 0x100) {
2260 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2261 } else {
2262 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2263 }
1ed8a2b3 2264 FLUSH
1da177e4 2265 }
2f1a2ccb
EK		 2266
2267 while (1) {
2268 if (vc->vc_need_wrap || vc->vc_decim)
2269 FLUSH
2270 if (vc->vc_need_wrap) {
2271 cr(vc);
2272 lf(vc);
2273 }
2274 if (vc->vc_decim)
2275 insert_char(vc, 1);
2276 scr_writew(himask ?
2277 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2278 (vc_attr << 8) + tc,
2279 (u16 *) vc->vc_pos);
2280 if (DO_UPDATE(vc) && draw_x < 0) {
2281 draw_x = vc->vc_x;
2282 draw_from = vc->vc_pos;
2283 }
2284 if (vc->vc_x == vc->vc_cols - 1) {
2285 vc->vc_need_wrap = vc->vc_decawm;
2286 draw_to = vc->vc_pos + 2;
2287 } else {
2288 vc->vc_x++;
2289 draw_to = (vc->vc_pos += 2);
d4328b40 2290 }
2f1a2ccb
EK		 2291
2292 if (!--width) break;
2293
2294 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2295 if (tc < 0) tc = ' ';
2296 }
b293d758 2297 notify_write(vc, c);
2f1a2ccb 2298
1ed8a2b3
EK		 2299 if (inverse) {
2300 FLUSH
2301 }
2302
2f1a2ccb
EK		 2303 if (rescan) {
2304 rescan = 0;
2305 inverse = 0;
2306 width = 1;
d4328b40
AT		 2307 c = orig;
2308 goto rescan_last_byte;
2309 }
1da177e4
LT		 2310 continue;
2311 }
2312 FLUSH
2313 do_con_trol(tty, vc, orig);
2314 }
2315 FLUSH
2316 console_conditional_schedule();
ac751efa 2317 console_unlock();
b293d758 2318 notify_update(vc);
1da177e4
LT		 2319 return n;
2320#undef FLUSH
2321}
2322
2323/*
2324 * This is the console switching callback.
2325 *
2326 * Doing console switching in a process context allows
2327 * us to do the switches asynchronously (needed when we want
2328 * to switch due to a keyboard interrupt). Synchronization
2329 * with other console code and prevention of re-entrancy is
ac751efa 2330 * ensured with console_lock.
1da177e4 2331 */
65f27f38 2332static void console_callback(struct work_struct *ignored)
1da177e4 2333{
ac751efa 2334 console_lock();
1da177e4
LT		 2335
2336 if (want_console >= 0) {
2337 if (want_console != fg_console &&
2338 vc_cons_allocated(want_console)) {
2339 hide_cursor(vc_cons[fg_console].d);
2340 change_console(vc_cons[want_console].d);
2341 /* we only changed when the console had already
2342 been allocated - a new console is not created
2343 in an interrupt routine */
2344 }
2345 want_console = -1;
2346 }
2347 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2348 do_poke_blanked_console = 0;
2349 poke_blanked_console();
2350 }
2351 if (scrollback_delta) {
2352 struct vc_data *vc = vc_cons[fg_console].d;
2353 clear_selection();
2354 if (vc->vc_mode == KD_TEXT)
2355 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2356 scrollback_delta = 0;
2357 }
2358 if (blank_timer_expired) {
2359 do_blank_screen(0);
2360 blank_timer_expired = 0;
2361 }
b293d758 2362 notify_update(vc_cons[fg_console].d);
1da177e4 2363
ac751efa 2364 console_unlock();
1da177e4
LT		 2365}
2366
b257bc05 2367int set_console(int nr)
1da177e4 2368{
b257bc05
AJ		 2369 struct vc_data *vc = vc_cons[fg_console].d;
2370
2371 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2372 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2373
2374 /*
2375 * Console switch will fail in console_callback() or
2376 * change_console() so there is no point scheduling
2377 * the callback
2378 *
2379 * Existing set_console() users don't check the return
2380 * value so this shouldn't break anything
2381 */
2382 return -EINVAL;
2383 }
2384
1da177e4
LT		 2385 want_console = nr;
2386 schedule_console_callback();
b257bc05
AJ		 2387
2388 return 0;
1da177e4
LT		 2389}
2390
2391struct tty_driver *console_driver;
2392
2393#ifdef CONFIG_VT_CONSOLE
2394
5ada918b
BW		 2395/**
2396 * vt_kmsg_redirect() - Sets/gets the kernel message console
2397 * @new: The new virtual terminal number or -1 if the console should stay
2398 * unchanged
2399 *
2400 * By default, the kernel messages are always printed on the current virtual
2401 * console. However, the user may modify that default with the
2402 * TIOCL_SETKMSGREDIRECT ioctl call.
2403 *
2404 * This function sets the kernel message console to be @new. It returns the old
2405 * virtual console number. The virtual terminal number 0 (both as parameter and
2406 * return value) means no redirection (i.e. always printed on the currently
2407 * active console).
2408 *
2409 * The parameter -1 means that only the current console is returned, but the
2410 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2411 * case to make the code more understandable.
2412 *
2413 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2414 * the parameter and always returns 0.
2415 */
2416int vt_kmsg_redirect(int new)
2417{
2418 static int kmsg_con;
2419
2420 if (new != -1)
2421 return xchg(&kmsg_con, new);
2422 else
2423 return kmsg_con;
2424}
2425
1da177e4
LT		 2426/*
2427 * Console on virtual terminal
2428 *
2429 * The console must be locked when we get here.
2430 */
2431
2432static void vt_console_print(struct console *co, const char *b, unsigned count)
2433{
2434 struct vc_data *vc = vc_cons[fg_console].d;
2435 unsigned char c;
b0940003 2436 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2437 const ushort *start;
2438 ushort cnt = 0;
2439 ushort myx;
5ada918b 2440 int kmsg_console;
1da177e4
LT		 2441
2442 /* console busy or not yet initialized */
b0940003
NP		 2443 if (!printable)
2444 return;
2445 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2446 return;
2447
5ada918b
BW		 2448 kmsg_console = vt_get_kmsg_redirect();
2449 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2450 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2451
2452 /* read `x' only after setting currcons properly (otherwise
2453 the `x' macro will read the x of the foreground console). */
2454 myx = vc->vc_x;
2455
2456 if (!vc_cons_allocated(fg_console)) {
2457 /* impossible */
2458 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2459 goto quit;
2460 }
2461
8fd4bd22 2462 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2463 goto quit;
2464
2465 /* undraw cursor first */
2466 if (IS_FG(vc))
2467 hide_cursor(vc);
2468
2469 start = (ushort *)vc->vc_pos;
2470
2471 /* Contrived structure to try to emulate original need_wrap behaviour
2472 * Problems caused when we have need_wrap set on '\n' character */
2473 while (count--) {
2474 c = *b++;
2475 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2476 if (cnt > 0) {
2477 if (CON_IS_VISIBLE(vc))
2478 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2479 vc->vc_x += cnt;
2480 if (vc->vc_need_wrap)
2481 vc->vc_x--;
2482 cnt = 0;
2483 }
2484 if (c == 8) { /* backspace */
2485 bs(vc);
2486 start = (ushort *)vc->vc_pos;
2487 myx = vc->vc_x;
2488 continue;
2489 }
2490 if (c != 13)
2491 lf(vc);
2492 cr(vc);
2493 start = (ushort *)vc->vc_pos;
2494 myx = vc->vc_x;
2495 if (c == 10 || c == 13)
2496 continue;
2497 }
2498 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2499 notify_write(vc, c);
1da177e4
LT		 2500 cnt++;
2501 if (myx == vc->vc_cols - 1) {
2502 vc->vc_need_wrap = 1;
2503 continue;
2504 }
2505 vc->vc_pos += 2;
2506 myx++;
2507 }
2508 if (cnt > 0) {
2509 if (CON_IS_VISIBLE(vc))
2510 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2511 vc->vc_x += cnt;
2512 if (vc->vc_x == vc->vc_cols) {
2513 vc->vc_x--;
2514 vc->vc_need_wrap = 1;
2515 }
2516 }
2517 set_cursor(vc);
b293d758 2518 notify_update(vc);
1da177e4
LT		 2519
2520quit:
b0940003 2521 spin_unlock(&printing_lock);
1da177e4
LT		 2522}
2523
2524static struct tty_driver *vt_console_device(struct console *c, int *index)
2525{
2526 *index = c->index ? c->index-1 : fg_console;
2527 return console_driver;
2528}
2529
2530static struct console vt_console_driver = {
2531 .name = "tty",
2532 .write = vt_console_print,
2533 .device = vt_console_device,
2534 .unblank = unblank_screen,
2535 .flags = CON_PRINTBUFFER,
2536 .index = -1,
2537};
2538#endif
2539
2540/*
2541 * Handling of Linux-specific VC ioctls
2542 */
2543
2544/*
ac751efa 2545 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2546 *
2547 * There are some functions which don't need it.
2548 *
2549 * There are some functions which can sleep for arbitrary periods
2550 * (paste_selection) but we don't need the lock there anyway.
2551 *
2552 * set_selection has locking, and definitely needs it
2553 */
2554
2555int tioclinux(struct tty_struct *tty, unsigned long arg)
2556{
2557 char type, data;
2558 char __user *p = (char __user *)arg;
2559 int lines;
2560 int ret;
2561
1da177e4
LT		 2562 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2563 return -EPERM;
2564 if (get_user(type, p))
2565 return -EFAULT;
2566 ret = 0;
04f378b1 2567
1da177e4
LT		 2568 switch (type)
2569 {
2570 case TIOCL_SETSEL:
ac751efa 2571 console_lock();
1da177e4 2572 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2573 console_unlock();
1da177e4
LT		 2574 break;
2575 case TIOCL_PASTESEL:
2576 ret = paste_selection(tty);
2577 break;
2578 case TIOCL_UNBLANKSCREEN:
ac751efa 2579 console_lock();
1da177e4 2580 unblank_screen();
ac751efa 2581 console_unlock();
1da177e4
LT		 2582 break;
2583 case TIOCL_SELLOADLUT:
5289475d 2584 console_lock();
1da177e4 2585 ret = sel_loadlut(p);
5289475d 2586 console_unlock();
1da177e4
LT		 2587 break;
2588 case TIOCL_GETSHIFTSTATE:
04f378b1 2589
1da177e4
LT		 2590 /*
2591 * Make it possible to react to Shift+Mousebutton.
2592 * Note that 'shift_state' is an undocumented
2593 * kernel-internal variable; programs not closely
2594 * related to the kernel should not use this.
2595 */
079c9534 2596 data = vt_get_shift_state();
1da177e4
LT		 2597 ret = __put_user(data, p);
2598 break;
2599 case TIOCL_GETMOUSEREPORTING:
20f62579 2600 console_lock(); /* May be overkill */
1da177e4 2601 data = mouse_reporting();
20f62579 2602 console_unlock();
1da177e4
LT		 2603 ret = __put_user(data, p);
2604 break;
2605 case TIOCL_SETVESABLANK:
20f62579 2606 console_lock();
403aac96 2607 ret = set_vesa_blanking(p);
20f62579 2608 console_unlock();
1da177e4 2609 break;
0ca07731 2610 case TIOCL_GETKMSGREDIRECT:
5ada918b 2611 data = vt_get_kmsg_redirect();
0ca07731
RW		 2612 ret = __put_user(data, p);
2613 break;
1da177e4
LT		 2614 case TIOCL_SETKMSGREDIRECT:
2615 if (!capable(CAP_SYS_ADMIN)) {
2616 ret = -EPERM;
2617 } else {
2618 if (get_user(data, p+1))
2619 ret = -EFAULT;
2620 else
5ada918b 2621 vt_kmsg_redirect(data);
1da177e4
LT		 2622 }
2623 break;
2624 case TIOCL_GETFGCONSOLE:
20f62579
AC		 2625 /* No locking needed as this is a transiently
2626 correct return anyway if the caller hasn't
2627 disabled switching */
1da177e4
LT		 2628 ret = fg_console;
2629 break;
2630 case TIOCL_SCROLLCONSOLE:
2631 if (get_user(lines, (s32 __user *)(p+4))) {
2632 ret = -EFAULT;
2633 } else {
20f62579
AC		 2634 /* Need the console lock here. Note that lots
2635 of other calls need fixing before the lock
2636 is actually useful ! */
2637 console_lock();
1da177e4 2638 scrollfront(vc_cons[fg_console].d, lines);
20f62579 2639 console_unlock();
1da177e4
LT		 2640 ret = 0;
2641 }
2642 break;
2643 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2644 console_lock();
1da177e4
LT		 2645 ignore_poke = 1;
2646 do_blank_screen(0);
ac751efa 2647 console_unlock();
1da177e4
LT		 2648 break;
2649 case TIOCL_BLANKEDSCREEN:
2650 ret = console_blanked;
2651 break;
2652 default:
2653 ret = -EINVAL;
2654 break;
2655 }
2656 return ret;
2657}
2658
2659/*
2660 * /dev/ttyN handling
2661 */
2662
2663static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2664{
2665 int retval;
2666
2667 retval = do_con_write(tty, buf, count);
2668 con_flush_chars(tty);
2669
2670 return retval;
2671}
2672
5d19f546 2673static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2674{
2675 if (in_interrupt())
5d19f546
AC		 2676 return 0; /* n_r3964 calls put_char() from interrupt context */
2677 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2678}
2679
2680static int con_write_room(struct tty_struct *tty)
2681{
2682 if (tty->stopped)
2683 return 0;
a88a69c9 2684 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2685}
2686
2687static int con_chars_in_buffer(struct tty_struct *tty)
2688{
2689 return 0; /* we're not buffering */
2690}
2691
2692/*
2693 * con_throttle and con_unthrottle are only used for
2694 * paste_selection(), which has to stuff in a large number of
2695 * characters...
2696 */
2697static void con_throttle(struct tty_struct *tty)
2698{
2699}
2700
2701static void con_unthrottle(struct tty_struct *tty)
2702{
2703 struct vc_data *vc = tty->driver_data;
2704
2705 wake_up_interruptible(&vc->paste_wait);
2706}
2707
2708/*
2709 * Turn the Scroll-Lock LED on when the tty is stopped
2710 */
2711static void con_stop(struct tty_struct *tty)
2712{
2713 int console_num;
2714 if (!tty)
2715 return;
2716 console_num = tty->index;
2717 if (!vc_cons_allocated(console_num))
2718 return;
079c9534 2719 vt_kbd_con_stop(console_num);
1da177e4
LT		 2720}
2721
2722/*
2723 * Turn the Scroll-Lock LED off when the console is started
2724 */
2725static void con_start(struct tty_struct *tty)
2726{
2727 int console_num;
2728 if (!tty)
2729 return;
2730 console_num = tty->index;
2731 if (!vc_cons_allocated(console_num))
2732 return;
079c9534 2733 vt_kbd_con_start(console_num);
1da177e4
LT		 2734}
2735
2736static void con_flush_chars(struct tty_struct *tty)
2737{
2738 struct vc_data *vc;
2739
2740 if (in_interrupt()) /* from flush_to_ldisc */
2741 return;
2742
2743 /* if we race with con_close(), vt may be null */
ac751efa 2744 console_lock();
1da177e4
LT		 2745 vc = tty->driver_data;
2746 if (vc)
2747 set_cursor(vc);
ac751efa 2748 console_unlock();
1da177e4
LT		 2749}
2750
2751/*
2752 * Allocate the console screen memory.
2753 */
bc1e99d9 2754static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 2755{
2756 unsigned int currcons = tty->index;
bc1e99d9
JS		 2757 struct vc_data *vc;
2758 int ret;
1da177e4 2759
ac751efa 2760 console_lock();
bc1e99d9
JS		 2761 ret = vc_allocate(currcons);
2762 if (ret)
2763 goto unlock;
feebed65 2764
bc1e99d9 2765 vc = vc_cons[currcons].d;
1da177e4 2766
bc1e99d9
JS		 2767 /* Still being freed */
2768 if (vc->port.tty) {
2769 ret = -ERESTARTSYS;
2770 goto unlock;
2771 }
2772
2773 ret = tty_port_install(&vc->port, driver, tty);
2774 if (ret)
2775 goto unlock;
2776
2777 tty->driver_data = vc;
2778 vc->port.tty = tty;
2779
2780 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2781 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2782 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 2783 }
bc1e99d9 2784 if (vc->vc_utf)
adc8d746 2785 tty->termios.c_iflag |= IUTF8;
bc1e99d9 2786 else
adc8d746 2787 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 2788unlock:
ac751efa 2789 console_unlock();
1da177e4
LT		 2790 return ret;
2791}
2792
bc1e99d9
JS		 2793static int con_open(struct tty_struct *tty, struct file *filp)
2794{
2795 /* everything done in install */
2796 return 0;
2797}
2798
2799
1da177e4
LT		 2800static void con_close(struct tty_struct *tty, struct file *filp)
2801{
feebed65
AC		 2802 /* Nothing to do - we defer to shutdown */
2803}
1da177e4 2804
feebed65
AC		 2805static void con_shutdown(struct tty_struct *tty)
2806{
2807 struct vc_data *vc = tty->driver_data;
2808 BUG_ON(vc == NULL);
ac751efa 2809 console_lock();
8ce73264 2810 vc->port.tty = NULL;
ac751efa 2811 console_unlock();
1da177e4
LT		 2812}
2813
fa6ce9ab
JE		 2814static int default_italic_color = 2; // green (ASCII)
2815static int default_underline_color = 3; // cyan (ASCII)
2816module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2817module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2818
1da177e4
LT		 2819static void vc_init(struct vc_data *vc, unsigned int rows,
2820 unsigned int cols, int do_clear)
2821{
2822 int j, k ;
2823
2824 vc->vc_cols = cols;
2825 vc->vc_rows = rows;
2826 vc->vc_size_row = cols << 1;
2827 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2828
2829 set_origin(vc);
2830 vc->vc_pos = vc->vc_origin;
2831 reset_vc(vc);
2832 for (j=k=0; j<16; j++) {
2833 vc->vc_palette[k++] = default_red[j] ;
2834 vc->vc_palette[k++] = default_grn[j] ;
2835 vc->vc_palette[k++] = default_blu[j] ;
2836 }
2837 vc->vc_def_color = 0x07; /* white */
fa6ce9ab
JE		 2838 vc->vc_ulcolor = default_underline_color;
2839 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2840 vc->vc_halfcolor = 0x08; /* grey */
2841 init_waitqueue_head(&vc->paste_wait);
2842 reset_terminal(vc, do_clear);
2843}
2844
2845/*
2846 * This routine initializes console interrupts, and does nothing
2847 * else. If you want the screen to clear, call tty_write with
2848 * the appropriate escape-sequence.
2849 */
2850
2851static int __init con_init(void)
2852{
2853 const char *display_desc = NULL;
2854 struct vc_data *vc;
3e795de7 2855 unsigned int currcons = 0, i;
1da177e4 2856
ac751efa 2857 console_lock();
1da177e4
LT		 2858
2859 if (conswitchp)
2860 display_desc = conswitchp->con_startup();
2861 if (!display_desc) {
2862 fg_console = 0;
ac751efa 2863 console_unlock();
1da177e4
LT		 2864 return 0;
2865 }
2866
3e795de7
AD		 2867 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2868 struct con_driver *con_driver = &registered_con_driver[i];
2869
2870 if (con_driver->con == NULL) {
2871 con_driver->con = conswitchp;
2872 con_driver->desc = display_desc;
2873 con_driver->flag = CON_DRIVER_FLAG_INIT;
2874 con_driver->first = 0;
2875 con_driver->last = MAX_NR_CONSOLES - 1;
2876 break;
2877 }
2878 }
2879
2880 for (i = 0; i < MAX_NR_CONSOLES; i++)
2881 con_driver_map[i] = conswitchp;
2882
1da177e4
LT		 2883 if (blankinterval) {
2884 blank_state = blank_normal_wait;
f324edc8 2885 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2886 }
2887
1da177e4 2888 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2889 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2890 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 2891 tty_port_init(&vc->port);
1da177e4 2892 visual_init(vc, currcons, 1);
a5f4f52e 2893 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 2894 vc_init(vc, vc->vc_rows, vc->vc_cols,
2895 currcons || !vc->vc_sw->con_save_screen);
2896 }
2897 currcons = fg_console = 0;
2898 master_display_fg = vc = vc_cons[currcons].d;
2899 set_origin(vc);
2900 save_screen(vc);
2901 gotoxy(vc, vc->vc_x, vc->vc_y);
2902 csi_J(vc, 0);
2903 update_screen(vc);
5da527aa 2904 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 2905 vc->vc_can_do_color ? "colour" : "mono",
2906 display_desc, vc->vc_cols, vc->vc_rows);
2907 printable = 1;
1da177e4 2908
ac751efa 2909 console_unlock();
1da177e4
LT		 2910
2911#ifdef CONFIG_VT_CONSOLE
2912 register_console(&vt_console_driver);
2913#endif
2914 return 0;
2915}
2916console_initcall(con_init);
2917
b68e31d0 2918static const struct tty_operations con_ops = {
bc1e99d9 2919 .install = con_install,
1da177e4
LT		 2920 .open = con_open,
2921 .close = con_close,
2922 .write = con_write,
2923 .write_room = con_write_room,
2924 .put_char = con_put_char,
2925 .flush_chars = con_flush_chars,
2926 .chars_in_buffer = con_chars_in_buffer,
2927 .ioctl = vt_ioctl,
e9216651
AB		 2928#ifdef CONFIG_COMPAT
2929 .compat_ioctl = vt_compat_ioctl,
2930#endif
1da177e4
LT		 2931 .stop = con_stop,
2932 .start = con_start,
2933 .throttle = con_throttle,
2934 .unthrottle = con_unthrottle,
8c9a9dd0 2935 .resize = vt_resize,
feebed65 2936 .shutdown = con_shutdown
1da177e4
LT		 2937};
2938
d81ed103
AC		 2939static struct cdev vc0_cdev;
2940
fbc92a34
KS		 2941static ssize_t show_tty_active(struct device *dev,
2942 struct device_attribute *attr, char *buf)
2943{
2944 return sprintf(buf, "tty%d\n", fg_console + 1);
2945}
2946static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2947
d81ed103 2948int __init vty_init(const struct file_operations *console_fops)
1da177e4 2949{
d81ed103
AC		 2950 cdev_init(&vc0_cdev, console_fops);
2951 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2952 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2953 panic("Couldn't register /dev/tty0 driver\n");
fbc92a34
KS		 2954 tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2955 if (IS_ERR(tty0dev))
2956 tty0dev = NULL;
2957 else
a2a6a822 2958 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
d81ed103 2959
1da177e4
LT		 2960 vcs_init();
2961
2962 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2963 if (!console_driver)
2964 panic("Couldn't allocate console driver\n");
2f16669d 2965
1da177e4
LT		 2966 console_driver->name = "tty";
2967 console_driver->name_base = 1;
2968 console_driver->major = TTY_MAJOR;
2969 console_driver->minor_start = 1;
2970 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2971 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 2972 if (default_utf8)
2973 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 2974 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2975 tty_set_operations(console_driver, &con_ops);
2976 if (tty_register_driver(console_driver))
2977 panic("Couldn't register console driver\n");
1da177e4
LT		 2978 kbd_init();
2979 console_map_init();
1da177e4
LT		 2980#ifdef CONFIG_MDA_CONSOLE
2981 mda_console_init();
2982#endif
2983 return 0;
2984}
2985
2986#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 2987
2988static struct class *vtconsole_class;
2989
b7269dd2
JB		 2990static int bind_con_driver(const struct consw *csw, int first, int last,
2991 int deflt)
1da177e4 2992{
3e795de7
AD		 2993 struct module *owner = csw->owner;
2994 const char *desc = NULL;
2995 struct con_driver *con_driver;
2996 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 2997
1da177e4
LT		 2998 if (!try_module_get(owner))
2999 return -ENODEV;
3000
ac751efa 3001 console_lock();
1c8ce271 3002
3e795de7
AD		 3003 /* check if driver is registered */
3004 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3005 con_driver = &registered_con_driver[i];
3006
3007 if (con_driver->con == csw) {
3008 desc = con_driver->desc;
3009 retval = 0;
3010 break;
3011 }
3012 }
3013
3014 if (retval)
3015 goto err;
3016
3017 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3018 csw->con_startup();
3019 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3020 }
1c8ce271 3021
1da177e4
LT		 3022 if (deflt) {
3023 if (conswitchp)
3024 module_put(conswitchp->owner);
1c8ce271 3025
1da177e4
LT		 3026 __module_get(owner);
3027 conswitchp = csw;
3028 }
3029
3e795de7
AD		 3030 first = max(first, con_driver->first);
3031 last = min(last, con_driver->last);
3032
1da177e4
LT		 3033 for (i = first; i <= last; i++) {
3034 int old_was_color;
3035 struct vc_data *vc = vc_cons[i].d;
3036
3037 if (con_driver_map[i])
3038 module_put(con_driver_map[i]->owner);
3039 __module_get(owner);
3040 con_driver_map[i] = csw;
3041
3042 if (!vc || !vc->vc_sw)
3043 continue;
3044
3045 j = i;
1c8ce271 3046
4ee1acce
DH		 3047 if (CON_IS_VISIBLE(vc)) {
3048 k = i;
1da177e4 3049 save_screen(vc);
4ee1acce
DH		 3050 }
3051
1da177e4
LT		 3052 old_was_color = vc->vc_can_do_color;
3053 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3054 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3055 visual_init(vc, i, 0);
1c8ce271 3056 set_origin(vc);
1da177e4
LT		 3057 update_attr(vc);
3058
3059 /* If the console changed between mono <-> color, then
3060 * the attributes in the screenbuf will be wrong. The
3061 * following resets all attributes to something sane.
3062 */
3063 if (old_was_color != vc->vc_can_do_color)
3064 clear_buffer_attributes(vc);
1da177e4 3065 }
4ee1acce 3066
1ffdda95 3067 pr_info("Console: switching ");
1da177e4
LT		 3068 if (!deflt)
3069 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3070 if (j >= 0) {
3071 struct vc_data *vc = vc_cons[j].d;
3072
1da177e4 3073 printk("to %s %s %dx%d\n",
4ee1acce
DH		 3074 vc->vc_can_do_color ? "colour" : "mono",
3075 desc, vc->vc_cols, vc->vc_rows);
3076
3077 if (k >= 0) {
3078 vc = vc_cons[k].d;
3079 update_screen(vc);
3080 }
3081 } else
1da177e4
LT		 3082 printk("to %s\n", desc);
3083
3e795de7
AD		 3084 retval = 0;
3085err:
ac751efa 3086 console_unlock();
1da177e4 3087 module_put(owner);
3e795de7
AD		 3088 return retval;
3089};
1da177e4 3090
13ae6645
AD		 3091#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3092static int con_is_graphics(const struct consw *csw, int first, int last)
3093{
3094 int i, retval = 0;
3095
3096 for (i = first; i <= last; i++) {
3097 struct vc_data *vc = vc_cons[i].d;
3098
3099 if (vc && vc->vc_mode == KD_GRAPHICS) {
3100 retval = 1;
3101 break;
3102 }
3103 }
3104
3105 return retval;
3106}
3107
b7269dd2
JB		 3108/**
3109 * unbind_con_driver - unbind a console driver
3110 * @csw: pointer to console driver to unregister
3111 * @first: first in range of consoles that @csw should be unbound from
3112 * @last: last in range of consoles that @csw should be unbound from
3113 * @deflt: should next bound console driver be default after @csw is unbound?
3114 *
3115 * To unbind a driver from all possible consoles, pass 0 as @first and
3116 * %MAX_NR_CONSOLES as @last.
3117 *
3118 * @deflt controls whether the console that ends up replacing @csw should be
3119 * the default console.
3120 *
3121 * RETURNS:
3122 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3123 * or 0 on success.
3124 */
623e71b0 3125int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3126{
3e795de7
AD		 3127 struct module *owner = csw->owner;
3128 const struct consw *defcsw = NULL;
3129 struct con_driver *con_driver = NULL, *con_back = NULL;
3130 int i, retval = -ENODEV;
1da177e4 3131
3e795de7
AD		 3132 if (!try_module_get(owner))
3133 return -ENODEV;
3134
ac751efa 3135 console_lock();
3e795de7
AD		 3136
3137 /* check if driver is registered and if it is unbindable */
3138 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3139 con_driver = &registered_con_driver[i];
3140
3141 if (con_driver->con == csw &&
6db4063c 3142 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3143 retval = 0;
3144 break;
3145 }
3146 }
3147
3148 if (retval) {
ac751efa 3149 console_unlock();
3e795de7
AD		 3150 goto err;
3151 }
3152
6db4063c
AD		 3153 retval = -ENODEV;
3154
3e795de7
AD		 3155 /* check if backup driver exists */
3156 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3157 con_back = &registered_con_driver[i];
3158
3159 if (con_back->con &&
6db4063c 3160 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3e795de7
AD		 3161 defcsw = con_back->con;
3162 retval = 0;
3163 break;
3164 }
3165 }
3166
3167 if (retval) {
ac751efa 3168 console_unlock();
3e795de7
AD		 3169 goto err;
3170 }
3171
3172 if (!con_is_bound(csw)) {
ac751efa 3173 console_unlock();
3e795de7
AD		 3174 goto err;
3175 }
3176
3177 first = max(first, con_driver->first);
3178 last = min(last, con_driver->last);
3179
3180 for (i = first; i <= last; i++) {
1da177e4
LT		 3181 if (con_driver_map[i] == csw) {
3182 module_put(csw->owner);
3183 con_driver_map[i] = NULL;
3184 }
3e795de7
AD		 3185 }
3186
3187 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3188 const struct consw *defconsw = conswitchp;
3189
3e795de7
AD		 3190 defcsw->con_startup();
3191 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3192 /*
3193 * vgacon may change the default driver to point
3194 * to dummycon, we restore it here...
3195 */
3196 conswitchp = defconsw;
3e795de7
AD		 3197 }
3198
3199 if (!con_is_bound(csw))
3200 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3201
ac751efa 3202 console_unlock();
6db4063c
AD		 3203 /* ignore return value, binding should not fail */
3204 bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3205err:
3206 module_put(owner);
3207 return retval;
3208
3209}
623e71b0 3210EXPORT_SYMBOL(unbind_con_driver);
3e795de7 3211
6db4063c
AD		 3212static int vt_bind(struct con_driver *con)
3213{
3214 const struct consw *defcsw = NULL, *csw = NULL;
3215 int i, more = 1, first = -1, last = -1, deflt = 0;
3216
3217 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3218 con_is_graphics(con->con, con->first, con->last))
3219 goto err;
3220
3221 csw = con->con;
3222
3223 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3224 struct con_driver *con = &registered_con_driver[i];
3225
3226 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3227 defcsw = con->con;
3228 break;
3229 }
3230 }
3231
3232 if (!defcsw)
3233 goto err;
3234
3235 while (more) {
3236 more = 0;
3237
3238 for (i = con->first; i <= con->last; i++) {
3239 if (con_driver_map[i] == defcsw) {
3240 if (first == -1)
3241 first = i;
3242 last = i;
3243 more = 1;
3244 } else if (first != -1)
3245 break;
3246 }
3247
3248 if (first == 0 && last == MAX_NR_CONSOLES -1)
3249 deflt = 1;
3250
3251 if (first != -1)
3252 bind_con_driver(csw, first, last, deflt);
3253
3254 first = -1;
3255 last = -1;
3256 deflt = 0;
3257 }
3258
3259err:
3260 return 0;
3261}
3262
3263static int vt_unbind(struct con_driver *con)
3264{
3265 const struct consw *csw = NULL;
3266 int i, more = 1, first = -1, last = -1, deflt = 0;
3267
3268 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3269 con_is_graphics(con->con, con->first, con->last))
3270 goto err;
3271
3272 csw = con->con;
3273
3274 while (more) {
3275 more = 0;
3276
3277 for (i = con->first; i <= con->last; i++) {
3278 if (con_driver_map[i] == csw) {
3279 if (first == -1)
3280 first = i;
3281 last = i;
3282 more = 1;
3283 } else if (first != -1)
3284 break;
3285 }
3286
3287 if (first == 0 && last == MAX_NR_CONSOLES -1)
3288 deflt = 1;
3289
3290 if (first != -1)
3291 unbind_con_driver(csw, first, last, deflt);
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
3e795de7
AD		 3495/**
3496 * register_con_driver - register console driver to console layer
3497 * @csw: console driver
3498 * @first: the first console to take over, minimum value is 0
3499 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3500 *
3501 * DESCRIPTION: This function registers a console driver which can later
3502 * bind to a range of consoles specified by @first and @last. It will
3503 * also initialize the console driver by calling con_startup().
3504 */
3505int register_con_driver(const struct consw *csw, int first, int last)
3506{
3507 struct module *owner = csw->owner;
3508 struct con_driver *con_driver;
3509 const char *desc;
3510 int i, retval = 0;
3511
3512 if (!try_module_get(owner))
3513 return -ENODEV;
3514
ac751efa 3515 console_lock();
3e795de7
AD		 3516
3517 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3518 con_driver = &registered_con_driver[i];
3519
3520 /* already registered */
3521 if (con_driver->con == csw)
c55c63c6 3522 retval = -EBUSY;
3e795de7
AD		 3523 }
3524
3525 if (retval)
3526 goto err;
3527
3528 desc = csw->con_startup();
3529
3530 if (!desc)
3531 goto err;
3532
3533 retval = -EINVAL;
3534
3535 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3536 con_driver = &registered_con_driver[i];
3537
3538 if (con_driver->con == NULL) {
3539 con_driver->con = csw;
3540 con_driver->desc = desc;
6db4063c
AD		 3541 con_driver->node = i;
3542 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3543 CON_DRIVER_FLAG_INIT;
3544 con_driver->first = first;
3545 con_driver->last = last;
3546 retval = 0;
3547 break;
3548 }
3549 }
3550
6db4063c
AD		 3551 if (retval)
3552 goto err;
3553
d81ed103 3554 con_driver->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3555 MKDEV(0, con_driver->node),
3556 NULL, "vtcon%i",
3557 con_driver->node);
6db4063c 3558
805952a8
GKH		 3559 if (IS_ERR(con_driver->dev)) {
3560 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3561 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3562 PTR_ERR(con_driver->dev));
3563 con_driver->dev = NULL;
6db4063c 3564 } else {
805952a8 3565 vtconsole_init_device(con_driver);
6db4063c 3566 }
928e964f 3567
3e795de7 3568err:
ac751efa 3569 console_unlock();
3e795de7
AD		 3570 module_put(owner);
3571 return retval;
3572}
3573EXPORT_SYMBOL(register_con_driver);
3574
3575/**
3576 * unregister_con_driver - unregister console driver from console layer
3577 * @csw: console driver
3578 *
3579 * DESCRIPTION: All drivers that registers to the console layer must
3580 * call this function upon exit, or if the console driver is in a state
3581 * where it won't be able to handle console services, such as the
3582 * framebuffer console without loaded framebuffer drivers.
3583 *
3584 * The driver must unbind first prior to unregistration.
3585 */
3586int unregister_con_driver(const struct consw *csw)
3587{
3588 int i, retval = -ENODEV;
3589
ac751efa 3590 console_lock();
3e795de7
AD		 3591
3592 /* cannot unregister a bound driver */
3593 if (con_is_bound(csw))
3594 goto err;
3595
3596 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3597 struct con_driver *con_driver = &registered_con_driver[i];
3598
3599 if (con_driver->con == csw &&
6db4063c 3600 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
805952a8
GKH		 3601 vtconsole_deinit_device(con_driver);
3602 device_destroy(vtconsole_class,
3603 MKDEV(0, con_driver->node));
3e795de7
AD		 3604 con_driver->con = NULL;
3605 con_driver->desc = NULL;
805952a8 3606 con_driver->dev = NULL;
6db4063c 3607 con_driver->node = 0;
3e795de7
AD		 3608 con_driver->flag = 0;
3609 con_driver->first = 0;
3610 con_driver->last = 0;
3611 retval = 0;
3612 break;
3613 }
3614 }
3e795de7 3615err:
ac751efa 3616 console_unlock();
3e795de7
AD		 3617 return retval;
3618}
3619EXPORT_SYMBOL(unregister_con_driver);
3620
3621/*
3622 * If we support more console drivers, this function is used
3623 * when a driver wants to take over some existing consoles
3624 * and become default driver for newly opened ones.
3625 *
3626 * take_over_console is basically a register followed by unbind
3627 */
3628int take_over_console(const struct consw *csw, int first, int last, int deflt)
3629{
3630 int err;
3631
3632 err = register_con_driver(csw, first, last);
c55c63c6
DA		 3633 /* if we get an busy error we still want to bind the console driver
3634 * and return success, as we may have unbound the console driver
3635  * but not unregistered it.
3636 */
3637 if (err == -EBUSY)
3638 err = 0;
3e795de7 3639 if (!err)
6db4063c 3640 bind_con_driver(csw, first, last, deflt);
3e795de7
AD		 3641
3642 return err;
3643}
3644
3645/*
3646 * give_up_console is a wrapper to unregister_con_driver. It will only
3647 * work if driver is fully unbound.
3648 */
3649void give_up_console(const struct consw *csw)
3650{
3651 unregister_con_driver(csw);
3652}
3653
6db4063c 3654static int __init vtconsole_class_init(void)
3e795de7 3655{
6db4063c 3656 int i;
3e795de7 3657
6db4063c
AD		 3658 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3659 if (IS_ERR(vtconsole_class)) {
3660 printk(KERN_WARNING "Unable to create vt console class; "
3661 "errno = %ld\n", PTR_ERR(vtconsole_class));
3662 vtconsole_class = NULL;
3663 }
3e795de7 3664
6db4063c 3665 /* Add system drivers to sysfs */
3e795de7
AD		 3666 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3667 struct con_driver *con = &registered_con_driver[i];
3668
805952a8 3669 if (con->con && !con->dev) {
d81ed103 3670 con->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3671 MKDEV(0, con->node),
3672 NULL, "vtcon%i",
3673 con->node);
6db4063c 3674
805952a8 3675 if (IS_ERR(con->dev)) {
6db4063c 3676 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3677 "device for %s; errno = %ld\n",
3678 con->desc, PTR_ERR(con->dev));
3679 con->dev = NULL;
6db4063c 3680 } else {
805952a8 3681 vtconsole_init_device(con);
6db4063c 3682 }
3e795de7 3683 }
3e795de7
AD		 3684 }
3685
3e795de7
AD		 3686 return 0;
3687}
6db4063c 3688postcore_initcall(vtconsole_class_init);
3e795de7 3689
1da177e4
LT		 3690#endif
3691
3692/*
3693 * Screen blanking
3694 */
3695
403aac96 3696static int set_vesa_blanking(char __user *p)
1da177e4 3697{
403aac96
YY		 3698 unsigned int mode;
3699
3700 if (get_user(mode, p + 1))
3701 return -EFAULT;
3702
3703 vesa_blank_mode = (mode < 4) ? mode : 0;
3704 return 0;
1da177e4
LT		 3705}
3706
1da177e4
LT		 3707void do_blank_screen(int entering_gfx)
3708{
3709 struct vc_data *vc = vc_cons[fg_console].d;
3710 int i;
3711
3712 WARN_CONSOLE_UNLOCKED();
3713
3714 if (console_blanked) {
3715 if (blank_state == blank_vesa_wait) {
3716 blank_state = blank_off;
d060a321 3717 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3718 }
3719 return;
3720 }
1da177e4
LT		 3721
3722 /* entering graphics mode? */
3723 if (entering_gfx) {
3724 hide_cursor(vc);
3725 save_screen(vc);
3726 vc->vc_sw->con_blank(vc, -1, 1);
3727 console_blanked = fg_console + 1;
b6e8f00f 3728 blank_state = blank_off;
1da177e4
LT		 3729 set_origin(vc);
3730 return;
3731 }
3732
b6e8f00f 3733 if (blank_state != blank_normal_wait)
3734 return;
3735 blank_state = blank_off;
3736
1da177e4
LT		 3737 /* don't blank graphics */
3738 if (vc->vc_mode != KD_TEXT) {
3739 console_blanked = fg_console + 1;
3740 return;
3741 }
3742
3743 hide_cursor(vc);
3744 del_timer_sync(&console_timer);
3745 blank_timer_expired = 0;
3746
3747 save_screen(vc);
3748 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3749 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3750 console_blanked = fg_console + 1;
3751 if (i)
3752 set_origin(vc);
3753
3754 if (console_blank_hook && console_blank_hook(1))
3755 return;
3756
d060a321 3757 if (vesa_off_interval && vesa_blank_mode) {
030babac 3758 blank_state = blank_vesa_wait;
1da177e4
LT		 3759 mod_timer(&console_timer, jiffies + vesa_off_interval);
3760 }
8b92e87d 3761 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3762}
3763EXPORT_SYMBOL(do_blank_screen);
3764
3765/*
3766 * Called by timer as well as from vt_console_driver
3767 */
3768void do_unblank_screen(int leaving_gfx)
3769{
3770 struct vc_data *vc;
3771
3772 /* This should now always be called from a "sane" (read: can schedule)
3773 * context for the sake of the low level drivers, except in the special
3774 * case of oops_in_progress
3775 */
3776 if (!oops_in_progress)
3777 might_sleep();
3778
3779 WARN_CONSOLE_UNLOCKED();
3780
3781 ignore_poke = 0;
3782 if (!console_blanked)
3783 return;
3784 if (!vc_cons_allocated(fg_console)) {
3785 /* impossible */
1ffdda95
MSB		 3786 pr_warning("unblank_screen: tty %d not allocated ??\n",
3787 fg_console+1);
1da177e4
LT		 3788 return;
3789 }
3790 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3791 /* Try to unblank in oops case too */
3792 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3793 return; /* but leave console_blanked != 0 */
3794
3795 if (blankinterval) {
f324edc8 3796 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3797 blank_state = blank_normal_wait;
3798 }
3799
3800 console_blanked = 0;
8fd4bd22 3801 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3802 /* Low-level driver cannot restore -> do it ourselves */
3803 update_screen(vc);
3804 if (console_blank_hook)
3805 console_blank_hook(0);
3806 set_palette(vc);
3807 set_cursor(vc);
8b92e87d 3808 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3809}
3810EXPORT_SYMBOL(do_unblank_screen);
3811
3812/*
3813 * This is called by the outside world to cause a forced unblank, mostly for
3814 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3815 * call it with 1 as an argument and so force a mode restore... that may kill
3816 * X or at least garbage the screen but would also make the Oops visible...
3817 */
3818void unblank_screen(void)
3819{
3820 do_unblank_screen(0);
3821}
3822
3823/*
70522e12 3824 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3825 * (console operations can still happen at irq time, but only from printk which
70522e12 3826 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3827 */
3828static void blank_screen_t(unsigned long dummy)
3829{
cc63b1e1 3830 if (unlikely(!keventd_up())) {
f324edc8 3831 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3832 return;
3833 }
1da177e4
LT		 3834 blank_timer_expired = 1;
3835 schedule_work(&console_work);
3836}
3837
3838void poke_blanked_console(void)
3839{
3840 WARN_CONSOLE_UNLOCKED();
3841
3842 /* Add this so we quickly catch whoever might call us in a non
3843 * safe context. Nowadays, unblank_screen() isn't to be called in
3844 * atomic contexts and is allowed to schedule (with the special case
3845 * of oops_in_progress, but that isn't of any concern for this
3846 * function. --BenH.
3847 */
3848 might_sleep();
3849
3850 /* This isn't perfectly race free, but a race here would be mostly harmless,
3851 * at worse, we'll do a spurrious blank and it's unlikely
3852 */
3853 del_timer(&console_timer);
3854 blank_timer_expired = 0;
3855
3856 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3857 return;
3858 if (console_blanked)
3859 unblank_screen();
3860 else if (blankinterval) {
f324edc8 3861 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3862 blank_state = blank_normal_wait;
3863 }
3864}
3865
3866/*
3867 * Palettes
3868 */
3869
3870static void set_palette(struct vc_data *vc)
3871{
3872 WARN_CONSOLE_UNLOCKED();
3873
3874 if (vc->vc_mode != KD_GRAPHICS)
3875 vc->vc_sw->con_set_palette(vc, color_table);
3876}
3877
1da177e4
LT		 3878/*
3879 * Load palette into the DAC registers. arg points to a colour
3880 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3881 */
3882
3883int con_set_cmap(unsigned char __user *arg)
3884{
871bdea6
MG		 3885 int i, j, k;
3886 unsigned char colormap[3*16];
3887
3888 if (copy_from_user(colormap, arg, sizeof(colormap)))
3889 return -EFAULT;
1da177e4 3890
ac751efa 3891 console_lock();
871bdea6
MG		 3892 for (i = k = 0; i < 16; i++) {
3893 default_red[i] = colormap[k++];
3894 default_grn[i] = colormap[k++];
3895 default_blu[i] = colormap[k++];
3896 }
3897 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3898 if (!vc_cons_allocated(i))
3899 continue;
3900 for (j = k = 0; j < 16; j++) {
3901 vc_cons[i].d->vc_palette[k++] = default_red[j];
3902 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3903 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3904 }
3905 set_palette(vc_cons[i].d);
3906 }
ac751efa 3907 console_unlock();
1da177e4 3908
871bdea6 3909 return 0;
1da177e4
LT		 3910}
3911
3912int con_get_cmap(unsigned char __user *arg)
3913{
871bdea6
MG		 3914 int i, k;
3915 unsigned char colormap[3*16];
1da177e4 3916
ac751efa 3917 console_lock();
871bdea6
MG		 3918 for (i = k = 0; i < 16; i++) {
3919 colormap[k++] = default_red[i];
3920 colormap[k++] = default_grn[i];
3921 colormap[k++] = default_blu[i];
3922 }
ac751efa 3923 console_unlock();
1da177e4 3924
871bdea6
MG		 3925 if (copy_to_user(arg, colormap, sizeof(colormap)))
3926 return -EFAULT;
3927
3928 return 0;
1da177e4
LT		 3929}
3930
3931void reset_palette(struct vc_data *vc)
3932{
3933 int j, k;
3934 for (j=k=0; j<16; j++) {
3935 vc->vc_palette[k++] = default_red[j];
3936 vc->vc_palette[k++] = default_grn[j];
3937 vc->vc_palette[k++] = default_blu[j];
3938 }
3939 set_palette(vc);
3940}
3941
3942/*
3943 * Font switching
3944 *
3945 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3946 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3947 * depending on width) reserved for each character which is kinda wasty, but
3948 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 3949 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 3950 * format (maybe we should add a `fontoffset' field to the `display'
3951 * structure so we won't have to convert the fontdata all the time.
3952 * /Jes
3953 */
3954
3955#define max_font_size 65536
3956
3957static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3958{
3959 struct console_font font;
3960 int rc = -EINVAL;
3961 int c;
3962
1da177e4
LT		 3963 if (op->data) {
3964 font.data = kmalloc(max_font_size, GFP_KERNEL);
3965 if (!font.data)
3966 return -ENOMEM;
3967 } else
3968 font.data = NULL;
3969
ac751efa 3970 console_lock();
edab558f
AC		 3971 if (vc->vc_mode != KD_TEXT)
3972 rc = -EINVAL;
3973 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 3974 rc = vc->vc_sw->con_font_get(vc, &font);
3975 else
3976 rc = -ENOSYS;
ac751efa 3977 console_unlock();
1da177e4
LT		 3978
3979 if (rc)
3980 goto out;
3981
3982 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 3983
1da177e4
LT		 3984 if (op->data && font.charcount > op->charcount)
3985 rc = -ENOSPC;
3986 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3987 if (font.width > op->width || font.height > op->height)
3988 rc = -ENOSPC;
3989 } else {
3990 if (font.width != 8)
3991 rc = -EIO;
3992 else if ((op->height && font.height > op->height) ||
3993 font.height > 32)
3994 rc = -ENOSPC;
3995 }
3996 if (rc)
3997 goto out;
3998
3999 op->height = font.height;
4000 op->width = font.width;
4001 op->charcount = font.charcount;
4002
4003 if (op->data && copy_to_user(op->data, font.data, c))
4004 rc = -EFAULT;
4005
4006out:
4007 kfree(font.data);
4008 return rc;
4009}
4010
4011static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4012{
4013 struct console_font font;
4014 int rc = -EINVAL;
4015 int size;
4016
4017 if (vc->vc_mode != KD_TEXT)
4018 return -EINVAL;
4019 if (!op->data)
4020 return -EINVAL;
4021 if (op->charcount > 512)
4022 return -EINVAL;
4023 if (!op->height) { /* Need to guess font height [compat] */
4024 int h, i;
4025 u8 __user *charmap = op->data;
4026 u8 tmp;
4027
4028 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4029 so that we can get rid of this soon */
4030 if (!(op->flags & KD_FONT_FLAG_OLD))
4031 return -EINVAL;
4032 for (h = 32; h > 0; h--)
4033 for (i = 0; i < op->charcount; i++) {
4034 if (get_user(tmp, &charmap[32*i+h-1]))
4035 return -EFAULT;
4036 if (tmp)
4037 goto nonzero;
4038 }
4039 return -EINVAL;
4040 nonzero:
4041 op->height = h;
4042 }
4043 if (op->width <= 0 || op->width > 32 || op->height > 32)
4044 return -EINVAL;
4045 size = (op->width+7)/8 * 32 * op->charcount;
4046 if (size > max_font_size)
4047 return -ENOSPC;
4048 font.charcount = op->charcount;
4049 font.height = op->height;
4050 font.width = op->width;
9b71ca20
JL		 4051 font.data = memdup_user(op->data, size);
4052 if (IS_ERR(font.data))
4053 return PTR_ERR(font.data);
ac751efa 4054 console_lock();
edab558f
AC		 4055 if (vc->vc_mode != KD_TEXT)
4056 rc = -EINVAL;
4057 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4058 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4059 else
4060 rc = -ENOSYS;
ac751efa 4061 console_unlock();
1da177e4
LT		 4062 kfree(font.data);
4063 return rc;
4064}
4065
4066static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4067{
4068 struct console_font font = {.width = op->width, .height = op->height};
4069 char name[MAX_FONT_NAME];
4070 char *s = name;
4071 int rc;
4072
1da177e4
LT		 4073
4074 if (!op->data)
4075 s = NULL;
4076 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4077 return -EFAULT;
4078 else
4079 name[MAX_FONT_NAME - 1] = 0;
4080
ac751efa 4081 console_lock();
edab558f
AC		 4082 if (vc->vc_mode != KD_TEXT) {
4083 console_unlock();
4084 return -EINVAL;
4085 }
1da177e4
LT		 4086 if (vc->vc_sw->con_font_default)
4087 rc = vc->vc_sw->con_font_default(vc, &font, s);
4088 else
4089 rc = -ENOSYS;
ac751efa 4090 console_unlock();
1da177e4
LT		 4091 if (!rc) {
4092 op->width = font.width;
4093 op->height = font.height;
4094 }
4095 return rc;
4096}
4097
4098static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4099{
4100 int con = op->height;
4101 int rc;
4102
1da177e4 4103
ac751efa 4104 console_lock();
edab558f
AC		 4105 if (vc->vc_mode != KD_TEXT)
4106 rc = -EINVAL;
4107 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4108 rc = -ENOSYS;
4109 else if (con < 0 || !vc_cons_allocated(con))
4110 rc = -ENOTTY;
4111 else if (con == vc->vc_num) /* nothing to do */
4112 rc = 0;
4113 else
4114 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4115 console_unlock();
1da177e4
LT		 4116 return rc;
4117}
4118
4119int con_font_op(struct vc_data *vc, struct console_font_op *op)
4120{
4121 switch (op->op) {
4122 case KD_FONT_OP_SET:
4123 return con_font_set(vc, op);
4124 case KD_FONT_OP_GET:
4125 return con_font_get(vc, op);
4126 case KD_FONT_OP_SET_DEFAULT:
4127 return con_font_default(vc, op);
4128 case KD_FONT_OP_COPY:
4129 return con_font_copy(vc, op);
4130 }
4131 return -ENOSYS;
4132}
4133
4134/*
4135 * Interface exported to selection and vcs.
4136 */
4137
4138/* used by selection */
4139u16 screen_glyph(struct vc_data *vc, int offset)
4140{
4141 u16 w = scr_readw(screenpos(vc, offset, 1));
4142 u16 c = w & 0xff;
4143
4144 if (w & vc->vc_hi_font_mask)
4145 c |= 0x100;
4146 return c;
4147}
f7511d5f 4148EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4149
4150/* used by vcs - note the word offset */
4151unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4152{
4153 return screenpos(vc, 2 * w_offset, viewed);
4154}
4155
4156void getconsxy(struct vc_data *vc, unsigned char *p)
4157{
4158 p[0] = vc->vc_x;
4159 p[1] = vc->vc_y;
4160}
4161
4162void putconsxy(struct vc_data *vc, unsigned char *p)
4163{
9477e260 4164 hide_cursor(vc);
1da177e4
LT		 4165 gotoxy(vc, p[0], p[1]);
4166 set_cursor(vc);
4167}
4168
4169u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4170{
4171 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4172 return softcursor_original;
4173 return scr_readw(org);
4174}
4175
4176void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4177{
4178 scr_writew(val, org);
4179 if ((unsigned long)org == vc->vc_pos) {
4180 softcursor_original = -1;
4181 add_softcursor(vc);
4182 }
4183}
4184
432c9ed2
NP		 4185void vcs_scr_updated(struct vc_data *vc)
4186{
4187 notify_update(vc);
4188}
4189
1da177e4
LT		 4190/*
4191 * Visible symbols for modules
4192 */
4193
4194EXPORT_SYMBOL(color_table);
4195EXPORT_SYMBOL(default_red);
4196EXPORT_SYMBOL(default_grn);
4197EXPORT_SYMBOL(default_blu);
4198EXPORT_SYMBOL(update_region);
4199EXPORT_SYMBOL(redraw_screen);
4200EXPORT_SYMBOL(vc_resize);
4201EXPORT_SYMBOL(fg_console);
4202EXPORT_SYMBOL(console_blank_hook);
4203EXPORT_SYMBOL(console_blanked);
4204EXPORT_SYMBOL(vc_cons);
f6c06b68 4205EXPORT_SYMBOL(global_cursor_default);
1da177e4
LT		 4206#ifndef VT_SINGLE_DRIVER
4207EXPORT_SYMBOL(take_over_console);
4208EXPORT_SYMBOL(give_up_console);
4209#endif
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