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