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serial: tegra: Correct error handling on DMA setup
[linux-2.6-block.git] / drivers / tty / vt / vt.c
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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
52c40fca
PH		 159#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
160
1da177e4 161static int printable; /* Is console ready for printing? */
77bf2bab 162int default_utf8 = true;
042f10ec 163module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 164int global_cursor_default = -1;
165module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 166
9ea9a886
CL		 167static int cur_default = CUR_DEFAULT;
168module_param(cur_default, int, S_IRUGO | S_IWUSR);
169
1da177e4
LT		 170/*
171 * ignore_poke: don't unblank the screen when things are typed. This is
172 * mainly for the privacy of braille terminal users.
173 */
174static int ignore_poke;
175
176int do_poke_blanked_console;
177int console_blanked;
178
179static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 180static int vesa_off_interval;
f324edc8
DM		 181static int blankinterval = 10*60;
182core_param(consoleblank, blankinterval, int, 0444);
1da177e4 183
65f27f38 184static DECLARE_WORK(console_work, console_callback);
1da177e4
LT		 185
186/*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
b45cfba4 190 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 191 */
192int fg_console;
193int last_console;
194int want_console = -1;
fed891c8
JW		 195static int saved_fg_console;
196static int saved_last_console;
197static int saved_want_console;
198static int saved_vc_mode;
beed5336 199static int saved_console_blanked;
1da177e4
LT		 200
201/*
202 * For each existing display, we have a pointer to console currently visible
203 * on that display, allowing consoles other than fg_console to be refreshed
204 * appropriately. Unless the low-level driver supplies its own display_fg
205 * variable, we use this one for the "master display".
206 */
207static struct vc_data *master_display_fg;
208
209/*
210 * Unfortunately, we need to delay tty echo when we're currently writing to the
211 * console since the code is (and always was) not re-entrant, so we schedule
212 * all flip requests to process context with schedule-task() and run it from
213 * console_callback().
214 */
215
216/*
217 * For the same reason, we defer scrollback to the console callback.
218 */
219static int scrollback_delta;
220
221/*
222 * Hook so that the power management routines can (un)blank
223 * the console on our behalf.
224 */
225int (*console_blank_hook)(int);
226
40565f19 227static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
1da177e4
LT		 228static int blank_state;
229static int blank_timer_expired;
230enum {
231 blank_off = 0,
232 blank_normal_wait,
233 blank_vesa_wait,
234};
235
fbc92a34
KS		 236/*
237 * /sys/class/tty/tty0/
238 *
239 * the attribute 'active' contains the name of the current vc
240 * console and it supports poll() to detect vc switches
241 */
242static struct device *tty0dev;
243
b293d758
ST		 244/*
245 * Notifier list for console events.
246 */
247static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
248
249int register_vt_notifier(struct notifier_block *nb)
250{
251 return atomic_notifier_chain_register(&vt_notifier_list, nb);
252}
253EXPORT_SYMBOL_GPL(register_vt_notifier);
254
255int unregister_vt_notifier(struct notifier_block *nb)
256{
257 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
258}
259EXPORT_SYMBOL_GPL(unregister_vt_notifier);
260
261static void notify_write(struct vc_data *vc, unsigned int unicode)
262{
502fcb79 263 struct vt_notifier_param param = { .vc = vc, .c = unicode };
b293d758
ST		 264 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
265}
266
267static void notify_update(struct vc_data *vc)
268{
269 struct vt_notifier_param param = { .vc = vc };
270 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
271}
1da177e4
LT		 272/*
273 * Low-Level Functions
274 */
275
276#define IS_FG(vc) ((vc)->vc_num == fg_console)
277
278#ifdef VT_BUF_VRAM_ONLY
279#define DO_UPDATE(vc) 0
280#else
f700d6e5 281#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
1da177e4
LT		 282#endif
283
284static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
285{
286 unsigned short *p;
287
288 if (!viewed)
289 p = (unsigned short *)(vc->vc_origin + offset);
290 else if (!vc->vc_sw->con_screen_pos)
291 p = (unsigned short *)(vc->vc_visible_origin + offset);
292 else
293 p = vc->vc_sw->con_screen_pos(vc, offset);
294 return p;
295}
296
e33ac1c1 297/* Called from the keyboard irq path.. */
1da177e4
LT		 298static inline void scrolldelta(int lines)
299{
e33ac1c1
AC		 300 /* FIXME */
301 /* scrolldelta needs some kind of consistency lock, but the BKL was
302 and still is not protecting versus the scheduled back end */
1da177e4
LT		 303 scrollback_delta += lines;
304 schedule_console_callback();
305}
306
307void schedule_console_callback(void)
308{
309 schedule_work(&console_work);
310}
311
312static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
313{
314 unsigned short *d, *s;
315
316 if (t+nr >= b)
317 nr = b - t - 1;
318 if (b > vc->vc_rows || t >= b || nr < 1)
319 return;
320 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
321 return;
322 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
323 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
324 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
386f40c8 325 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
1da177e4
LT		 326 vc->vc_size_row * nr);
327}
328
329static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
330{
331 unsigned short *s;
332 unsigned int step;
333
334 if (t+nr >= b)
335 nr = b - t - 1;
336 if (b > vc->vc_rows || t >= b || nr < 1)
337 return;
338 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
339 return;
340 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
341 step = vc->vc_cols * nr;
342 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
93f78da4 343 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
1da177e4
LT		 344}
345
346static void do_update_region(struct vc_data *vc, unsigned long start, int count)
347{
348#ifndef VT_BUF_VRAM_ONLY
349 unsigned int xx, yy, offset;
350 u16 *p;
351
352 p = (u16 *) start;
353 if (!vc->vc_sw->con_getxy) {
354 offset = (start - vc->vc_origin) / 2;
355 xx = offset % vc->vc_cols;
356 yy = offset / vc->vc_cols;
357 } else {
358 int nxx, nyy;
359 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
360 xx = nxx; yy = nyy;
361 }
362 for(;;) {
363 u16 attrib = scr_readw(p) & 0xff00;
364 int startx = xx;
365 u16 *q = p;
366 while (xx < vc->vc_cols && count) {
367 if (attrib != (scr_readw(p) & 0xff00)) {
368 if (p > q)
369 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
370 startx = xx;
371 q = p;
372 attrib = scr_readw(p) & 0xff00;
373 }
374 p++;
375 xx++;
376 count--;
377 }
378 if (p > q)
379 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
380 if (!count)
381 break;
382 xx = 0;
383 yy++;
384 if (vc->vc_sw->con_getxy) {
385 p = (u16 *)start;
386 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
387 }
388 }
389#endif
390}
391
392void update_region(struct vc_data *vc, unsigned long start, int count)
393{
394 WARN_CONSOLE_UNLOCKED();
395
396 if (DO_UPDATE(vc)) {
397 hide_cursor(vc);
398 do_update_region(vc, start, count);
399 set_cursor(vc);
400 }
401}
402
403/* Structure of attributes is hardware-dependent */
404
fa6ce9ab
JE		 405static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
406 u8 _underline, u8 _reverse, u8 _italic)
1da177e4
LT		 407{
408 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 409 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
410 _blink, _underline, _reverse, _italic);
1da177e4
LT		 411
412#ifndef VT_BUF_VRAM_ONLY
413/*
414 * ++roman: I completely changed the attribute format for monochrome
415 * mode (!can_do_color). The formerly used MDA (monochrome display
416 * adapter) format didn't allow the combination of certain effects.
417 * Now the attribute is just a bit vector:
418 * Bit 0..1: intensity (0..2)
419 * Bit 2 : underline
420 * Bit 3 : reverse
421 * Bit 7 : blink
422 */
423 {
c9e587ab 424 u8 a = _color;
1da177e4
LT		 425 if (!vc->vc_can_do_color)
426 return _intensity |
fa6ce9ab 427 (_italic ? 2 : 0) |
1da177e4
LT		 428 (_underline ? 4 : 0) |
429 (_reverse ? 8 : 0) |
430 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 431 if (_italic)
432 a = (a & 0xF0) | vc->vc_itcolor;
433 else if (_underline)
1da177e4
LT		 434 a = (a & 0xf0) | vc->vc_ulcolor;
435 else if (_intensity == 0)
436 a = (a & 0xf0) | vc->vc_ulcolor;
437 if (_reverse)
438 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
439 if (_blink)
440 a ^= 0x80;
441 if (_intensity == 2)
442 a ^= 0x08;
443 if (vc->vc_hi_font_mask == 0x100)
444 a <<= 1;
445 return a;
446 }
447#else
448 return 0;
449#endif
450}
451
452static void update_attr(struct vc_data *vc)
453{
fa6ce9ab
JE		 454 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
455 vc->vc_blink, vc->vc_underline,
456 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
457 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 458}
459
460/* Note: inverting the screen twice should revert to the original state */
461void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
462{
463 unsigned short *p;
464
465 WARN_CONSOLE_UNLOCKED();
466
467 count /= 2;
468 p = screenpos(vc, offset, viewed);
469 if (vc->vc_sw->con_invert_region)
470 vc->vc_sw->con_invert_region(vc, p, count);
471#ifndef VT_BUF_VRAM_ONLY
472 else {
473 u16 *q = p;
474 int cnt = count;
475 u16 a;
476
477 if (!vc->vc_can_do_color) {
478 while (cnt--) {
479 a = scr_readw(q);
480 a ^= 0x0800;
481 scr_writew(a, q);
482 q++;
483 }
484 } else if (vc->vc_hi_font_mask == 0x100) {
485 while (cnt--) {
486 a = scr_readw(q);
487 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
488 scr_writew(a, q);
489 q++;
490 }
491 } else {
492 while (cnt--) {
493 a = scr_readw(q);
494 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
495 scr_writew(a, q);
496 q++;
497 }
498 }
499 }
500#endif
501 if (DO_UPDATE(vc))
502 do_update_region(vc, (unsigned long) p, count);
19e3ae6b 503 notify_update(vc);
1da177e4
LT		 504}
505
506/* used by selection: complement pointer position */
507void complement_pos(struct vc_data *vc, int offset)
508{
414edcd3 509 static int old_offset = -1;
1da177e4
LT		 510 static unsigned short old;
511 static unsigned short oldx, oldy;
512
513 WARN_CONSOLE_UNLOCKED();
514
414edcd3
AD		 515 if (old_offset != -1 && old_offset >= 0 &&
516 old_offset < vc->vc_screenbuf_size) {
517 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 518 if (DO_UPDATE(vc))
519 vc->vc_sw->con_putc(vc, old, oldy, oldx);
19e3ae6b 520 notify_update(vc);
1da177e4 521 }
414edcd3
AD		 522
523 old_offset = offset;
524
525 if (offset != -1 && offset >= 0 &&
526 offset < vc->vc_screenbuf_size) {
1da177e4 527 unsigned short new;
414edcd3 528 unsigned short *p;
1da177e4
LT		 529 p = screenpos(vc, offset, 1);
530 old = scr_readw(p);
531 new = old ^ vc->vc_complement_mask;
532 scr_writew(new, p);
533 if (DO_UPDATE(vc)) {
534 oldx = (offset >> 1) % vc->vc_cols;
535 oldy = (offset >> 1) / vc->vc_cols;
536 vc->vc_sw->con_putc(vc, new, oldy, oldx);
537 }
19e3ae6b 538 notify_update(vc);
1da177e4
LT		 539 }
540}
541
542static void insert_char(struct vc_data *vc, unsigned int nr)
543{
81732c3b 544 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 545
a883b70d 546 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b 547 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
1da177e4 548 vc->vc_need_wrap = 0;
81732c3b
JFM		 549 if (DO_UPDATE(vc))
550 do_update_region(vc, (unsigned long) p,
b1a925f4 551 vc->vc_cols - vc->vc_x);
1da177e4
LT		 552}
553
554static void delete_char(struct vc_data *vc, unsigned int nr)
555{
81732c3b 556 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 557
b1a925f4 558 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b
JFM		 559 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
560 nr * 2);
1da177e4 561 vc->vc_need_wrap = 0;
81732c3b
JFM		 562 if (DO_UPDATE(vc))
563 do_update_region(vc, (unsigned long) p,
b1a925f4 564 vc->vc_cols - vc->vc_x);
1da177e4
LT		 565}
566
567static int softcursor_original;
568
569static void add_softcursor(struct vc_data *vc)
570{
571 int i = scr_readw((u16 *) vc->vc_pos);
572 u32 type = vc->vc_cursor_type;
573
574 if (! (type & 0x10)) return;
575 if (softcursor_original != -1) return;
576 softcursor_original = i;
577 i |= ((type >> 8) & 0xff00 );
578 i ^= ((type) & 0xff00 );
579 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
580 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
581 scr_writew(i, (u16 *) vc->vc_pos);
582 if (DO_UPDATE(vc))
583 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
584}
585
586static void hide_softcursor(struct vc_data *vc)
587{
588 if (softcursor_original != -1) {
589 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
590 if (DO_UPDATE(vc))
591 vc->vc_sw->con_putc(vc, softcursor_original,
592 vc->vc_y, vc->vc_x);
593 softcursor_original = -1;
594 }
595}
596
597static void hide_cursor(struct vc_data *vc)
598{
599 if (vc == sel_cons)
600 clear_selection();
601 vc->vc_sw->con_cursor(vc, CM_ERASE);
602 hide_softcursor(vc);
603}
604
605static void set_cursor(struct vc_data *vc)
606{
607 if (!IS_FG(vc) || console_blanked ||
608 vc->vc_mode == KD_GRAPHICS)
609 return;
610 if (vc->vc_deccm) {
611 if (vc == sel_cons)
612 clear_selection();
613 add_softcursor(vc);
614 if ((vc->vc_cursor_type & 0x0f) != 1)
615 vc->vc_sw->con_cursor(vc, CM_DRAW);
616 } else
617 hide_cursor(vc);
618}
619
620static void set_origin(struct vc_data *vc)
621{
622 WARN_CONSOLE_UNLOCKED();
623
624 if (!CON_IS_VISIBLE(vc) ||
625 !vc->vc_sw->con_set_origin ||
626 !vc->vc_sw->con_set_origin(vc))
627 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
628 vc->vc_visible_origin = vc->vc_origin;
629 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
630 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
631}
632
633static inline void save_screen(struct vc_data *vc)
634{
635 WARN_CONSOLE_UNLOCKED();
636
637 if (vc->vc_sw->con_save_screen)
638 vc->vc_sw->con_save_screen(vc);
639}
640
641/*
642 * Redrawing of screen
643 */
644
2a248307 645void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 646{
647 unsigned short *p = (unsigned short *)vc->vc_origin;
648 int count = vc->vc_screenbuf_size / 2;
649 int mask = vc->vc_hi_font_mask | 0xff;
650
651 for (; count > 0; count--, p++) {
652 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
653 }
654}
655
656void redraw_screen(struct vc_data *vc, int is_switch)
657{
658 int redraw = 0;
659
660 WARN_CONSOLE_UNLOCKED();
661
662 if (!vc) {
663 /* strange ... */
664 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
665 return;
666 }
667
668 if (is_switch) {
669 struct vc_data *old_vc = vc_cons[fg_console].d;
670 if (old_vc == vc)
671 return;
672 if (!CON_IS_VISIBLE(vc))
673 redraw = 1;
674 *vc->vc_display_fg = vc;
675 fg_console = vc->vc_num;
676 hide_cursor(old_vc);
677 if (!CON_IS_VISIBLE(old_vc)) {
678 save_screen(old_vc);
679 set_origin(old_vc);
680 }
fbc92a34
KS		 681 if (tty0dev)
682 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 683 } else {
684 hide_cursor(vc);
685 redraw = 1;
686 }
687
688 if (redraw) {
689 int update;
690 int old_was_color = vc->vc_can_do_color;
691
692 set_origin(vc);
693 update = vc->vc_sw->con_switch(vc);
694 set_palette(vc);
695 /*
696 * If console changed from mono<->color, the best we can do
697 * is to clear the buffer attributes. As it currently stands,
698 * rebuilding new attributes from the old buffer is not doable
699 * without overly complex code.
700 */
701 if (old_was_color != vc->vc_can_do_color) {
702 update_attr(vc);
703 clear_buffer_attributes(vc);
704 }
8fd4bd22
JB		 705
706 /* Forcibly update if we're panicing */
707 if ((update && vc->vc_mode != KD_GRAPHICS) ||
708 vt_force_oops_output(vc))
1da177e4
LT		 709 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
710 }
711 set_cursor(vc);
712 if (is_switch) {
713 set_leds();
714 compute_shiftstate();
8182ec49 715 notify_update(vc);
1da177e4
LT		 716 }
717}
718
719/*
720 * Allocation, freeing and resizing of VTs.
721 */
722
723int vc_cons_allocated(unsigned int i)
724{
725 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
726}
727
728static void visual_init(struct vc_data *vc, int num, int init)
729{
730 /* ++Geert: vc->vc_sw->con_init determines console size */
731 if (vc->vc_sw)
732 module_put(vc->vc_sw->owner);
733 vc->vc_sw = conswitchp;
734#ifndef VT_SINGLE_DRIVER
735 if (con_driver_map[num])
736 vc->vc_sw = con_driver_map[num];
737#endif
738 __module_get(vc->vc_sw->owner);
739 vc->vc_num = num;
740 vc->vc_display_fg = &master_display_fg;
741 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
e4bdab70 742 vc->vc_uni_pagedir = NULL;
1da177e4
LT		 743 vc->vc_hi_font_mask = 0;
744 vc->vc_complement_mask = 0;
745 vc->vc_can_do_color = 0;
8fd4bd22 746 vc->vc_panic_force_write = false;
1da177e4
LT		 747 vc->vc_sw->con_init(vc, init);
748 if (!vc->vc_complement_mask)
749 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
750 vc->vc_s_complement_mask = vc->vc_complement_mask;
751 vc->vc_size_row = vc->vc_cols << 1;
752 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
753}
754
755int vc_allocate(unsigned int currcons) /* return 0 on success */
756{
757 WARN_CONSOLE_UNLOCKED();
758
759 if (currcons >= MAX_NR_CONSOLES)
760 return -ENXIO;
761 if (!vc_cons[currcons].d) {
762 struct vc_data *vc;
b293d758 763 struct vt_notifier_param param;
1da177e4
LT		 764
765 /* prevent users from taking too much memory */
766 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
767 return -EPERM;
768
769 /* due to the granularity of kmalloc, we waste some memory here */
770 /* the alloc is done in two steps, to optimize the common situation
771 of a 25x80 console (structsize=216, screenbuf_size=4000) */
772 /* although the numbers above are not valid since long ago, the
773 point is still up-to-date and the comment still has its value
774 even if only as a historical artifact. --mj, July 1998 */
b293d758 775 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1da177e4
LT		 776 if (!vc)
777 return -ENOMEM;
1da177e4 778 vc_cons[currcons].d = vc;
ff917ba4 779 tty_port_init(&vc->port);
c2c88f10 780 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 781 visual_init(vc, currcons, 1);
782 if (!*vc->vc_uni_pagedir_loc)
783 con_set_default_unimap(vc);
5c9228f0 784 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1da177e4
LT		 785 if (!vc->vc_screenbuf) {
786 kfree(vc);
787 vc_cons[currcons].d = NULL;
788 return -ENOMEM;
789 }
f6c06b68
MG		 790
791 /* If no drivers have overridden us and the user didn't pass a
792 boot option, default to displaying the cursor */
793 if (global_cursor_default == -1)
794 global_cursor_default = 1;
795
1da177e4 796 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
4995f8ef 797 vcs_make_sysfs(currcons);
b293d758 798 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1da177e4
LT		 799 }
800 return 0;
801}
802
e400b6ec
AD		 803static inline int resize_screen(struct vc_data *vc, int width, int height,
804 int user)
1da177e4
LT		 805{
806 /* Resizes the resolution of the display adapater */
807 int err = 0;
808
809 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 810 err = vc->vc_sw->con_resize(vc, width, height, user);
811
1da177e4
LT		 812 return err;
813}
814
815/*
816 * Change # of rows and columns (0 means unchanged/the size of fg_console)
817 * [this is to be used together with some user program
818 * like resize that changes the hardware videomode]
819 */
820#define VC_RESIZE_MAXCOL (32767)
821#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 822
823/**
824 * vc_do_resize - resizing method for the tty
825 * @tty: tty being resized
826 * @real_tty: real tty (different to tty if a pty/tty pair)
827 * @vc: virtual console private data
828 * @cols: columns
829 * @lines: lines
830 *
831 * Resize a virtual console, clipping according to the actual constraints.
832 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 833 * information and perform any necessary signal handling.
8c9a9dd0 834 *
6a1c0680 835 * Caller must hold the console semaphore. Takes the termios rwsem and
8c9a9dd0
AC		 836 * ctrl_lock of the tty IFF a tty is passed.
837 */
838
fc6f6238
AC		 839static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
840 unsigned int cols, unsigned int lines)
1da177e4
LT		 841{
842 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 843 unsigned long end;
f2ee4ae8 844 unsigned int old_rows, old_row_size;
1da177e4 845 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 846 unsigned int user;
1da177e4
LT		 847 unsigned short *newscreen;
848
849 WARN_CONSOLE_UNLOCKED();
850
851 if (!vc)
852 return -ENXIO;
853
e400b6ec
AD		 854 user = vc->vc_resize_user;
855 vc->vc_resize_user = 0;
856
1da177e4
LT		 857 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
858 return -EINVAL;
859
860 new_cols = (cols ? cols : vc->vc_cols);
861 new_rows = (lines ? lines : vc->vc_rows);
862 new_row_size = new_cols << 1;
863 new_screen_size = new_row_size * new_rows;
864
865 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
866 return 0;
867
5cbded58 868 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 869 if (!newscreen)
870 return -ENOMEM;
871
872 old_rows = vc->vc_rows;
1da177e4 873 old_row_size = vc->vc_size_row;
1da177e4 874
e400b6ec 875 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 876 if (err) {
877 kfree(newscreen);
878 return err;
879 }
880
881 vc->vc_rows = new_rows;
882 vc->vc_cols = new_cols;
883 vc->vc_size_row = new_row_size;
884 vc->vc_screenbuf_size = new_screen_size;
885
886 rlth = min(old_row_size, new_row_size);
887 rrem = new_row_size - rlth;
888 old_origin = vc->vc_origin;
889 new_origin = (long) newscreen;
890 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 891
892 if (vc->vc_y > new_rows) {
893 if (old_rows - vc->vc_y < new_rows) {
894 /*
895 * Cursor near the bottom, copy contents from the
896 * bottom of buffer
897 */
898 old_origin += (old_rows - new_rows) * old_row_size;
3b41dc1a
AD		 899 } else {
900 /*
901 * Cursor is in no man's land, copy 1/2 screenful
902 * from the top and bottom of cursor position
903 */
904 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
3b41dc1a 905 }
9fc2b2d0
FJ		 906 }
907
908 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4
LT		 909
910 update_attr(vc);
911
3b41dc1a
AD		 912 while (old_origin < end) {
913 scr_memcpyw((unsigned short *) new_origin,
914 (unsigned short *) old_origin, rlth);
1da177e4 915 if (rrem)
3b41dc1a
AD		 916 scr_memsetw((void *)(new_origin + rlth),
917 vc->vc_video_erase_char, rrem);
1da177e4
LT		 918 old_origin += old_row_size;
919 new_origin += new_row_size;
920 }
921 if (new_scr_end > new_origin)
3b41dc1a
AD		 922 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
923 new_scr_end - new_origin);
5c9228f0 924 kfree(vc->vc_screenbuf);
1da177e4 925 vc->vc_screenbuf = newscreen;
1da177e4
LT		 926 vc->vc_screenbuf_size = new_screen_size;
927 set_origin(vc);
928
929 /* do part of a reset_terminal() */
930 vc->vc_top = 0;
931 vc->vc_bottom = vc->vc_rows;
932 gotoxy(vc, vc->vc_x, vc->vc_y);
933 save_cur(vc);
934
8c9a9dd0
AC		 935 if (tty) {
936 /* Rewrite the requested winsize data with the actual
937 resulting sizes */
938 struct winsize ws;
1da177e4
LT		 939 memset(&ws, 0, sizeof(ws));
940 ws.ws_row = vc->vc_rows;
941 ws.ws_col = vc->vc_cols;
942 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 943 tty_do_resize(tty, &ws);
1da177e4
LT		 944 }
945
946 if (CON_IS_VISIBLE(vc))
947 update_screen(vc);
8b92e87d 948 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 949 return err;
950}
951
8c9a9dd0
AC		 952/**
953 * vc_resize - resize a VT
954 * @vc: virtual console
955 * @cols: columns
956 * @rows: rows
957 *
958 * Resize a virtual console as seen from the console end of things. We
959 * use the common vc_do_resize methods to update the structures. The
960 * caller must hold the console sem to protect console internals and
8ce73264 961 * vc->port.tty
8c9a9dd0
AC		 962 */
963
964int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
965{
8ce73264 966 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 967}
968
969/**
970 * vt_resize - resize a VT
971 * @tty: tty to resize
8c9a9dd0
AC		 972 * @ws: winsize attributes
973 *
974 * Resize a virtual terminal. This is called by the tty layer as we
975 * register our own handler for resizing. The mutual helper does all
976 * the actual work.
977 *
978 * Takes the console sem and the called methods then take the tty
6a1c0680 979 * termios_rwsem and the tty ctrl_lock in that order.
8c9a9dd0 980 */
da2bdf9a 981static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 982{
8c9a9dd0
AC		 983 struct vc_data *vc = tty->driver_data;
984 int ret;
ca9bda00 985
ac751efa 986 console_lock();
fc6f6238 987 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 988 console_unlock();
8c9a9dd0 989 return ret;
ca9bda00 990}
1da177e4 991
421b40a6 992struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 993{
421b40a6
PH		 994 struct vc_data *vc = NULL;
995
1da177e4
LT		 996 WARN_CONSOLE_UNLOCKED();
997
998 if (vc_cons_allocated(currcons)) {
421b40a6 999 struct vt_notifier_param param;
4995f8ef 1000
421b40a6 1001 param.vc = vc = vc_cons[currcons].d;
b293d758 1002 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1003 vcs_remove_sysfs(currcons);
1da177e4 1004 vc->vc_sw->con_deinit(vc);
bde0d2c9 1005 put_pid(vc->vt_pid);
d459ec0b 1006 module_put(vc->vc_sw->owner);
5c9228f0 1007 kfree(vc->vc_screenbuf);
1da177e4
LT		 1008 vc_cons[currcons].d = NULL;
1009 }
421b40a6 1010 return vc;
1da177e4
LT		 1011}
1012
1013/*
1014 * VT102 emulator
1015 */
1016
079c9534
AC		 1017#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1018#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1019#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1020
1021#define decarm VC_REPEAT
1022#define decckm VC_CKMODE
1023#define kbdapplic VC_APPLIC
1024#define lnm VC_CRLF
1025
1026/*
1027 * this is what the terminal answers to a ESC-Z or csi0c query.
1028 */
1029#define VT100ID "\033[?1;2c"
1030#define VT102ID "\033[?6c"
1031
1032unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1033 8,12,10,14, 9,13,11,15 };
1034
1035/* the default colour table, for VGA+ colour systems */
1036int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1037 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1038int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1039 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1040int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1041 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1042
1c2bbe6a
JE		 1043module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1044module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1045module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1046
1da177e4
LT		 1047/*
1048 * gotoxy() must verify all boundaries, because the arguments
1049 * might also be negative. If the given position is out of
1050 * bounds, the cursor is placed at the nearest margin.
1051 */
1052static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1053{
1054 int min_y, max_y;
1055
1056 if (new_x < 0)
1057 vc->vc_x = 0;
1058 else {
1059 if (new_x >= vc->vc_cols)
1060 vc->vc_x = vc->vc_cols - 1;
1061 else
1062 vc->vc_x = new_x;
1063 }
1064
1065 if (vc->vc_decom) {
1066 min_y = vc->vc_top;
1067 max_y = vc->vc_bottom;
1068 } else {
1069 min_y = 0;
1070 max_y = vc->vc_rows;
1071 }
1072 if (new_y < min_y)
1073 vc->vc_y = min_y;
1074 else if (new_y >= max_y)
1075 vc->vc_y = max_y - 1;
1076 else
1077 vc->vc_y = new_y;
1078 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1079 vc->vc_need_wrap = 0;
1080}
1081
1082/* for absolute user moves, when decom is set */
1083static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1084{
1085 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1086}
1087
1088void scrollback(struct vc_data *vc, int lines)
1089{
1090 if (!lines)
1091 lines = vc->vc_rows / 2;
1092 scrolldelta(-lines);
1093}
1094
1095void scrollfront(struct vc_data *vc, int lines)
1096{
1097 if (!lines)
1098 lines = vc->vc_rows / 2;
1099 scrolldelta(lines);
1100}
1101
1102static void lf(struct vc_data *vc)
1103{
1104 /* don't scroll if above bottom of scrolling region, or
1105 * if below scrolling region
1106 */
1107 if (vc->vc_y + 1 == vc->vc_bottom)
1108 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1109 else if (vc->vc_y < vc->vc_rows - 1) {
1110 vc->vc_y++;
1111 vc->vc_pos += vc->vc_size_row;
1112 }
1113 vc->vc_need_wrap = 0;
b293d758 1114 notify_write(vc, '\n');
1da177e4
LT		 1115}
1116
1117static void ri(struct vc_data *vc)
1118{
1119 /* don't scroll if below top of scrolling region, or
1120 * if above scrolling region
1121 */
1122 if (vc->vc_y == vc->vc_top)
1123 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1124 else if (vc->vc_y > 0) {
1125 vc->vc_y--;
1126 vc->vc_pos -= vc->vc_size_row;
1127 }
1128 vc->vc_need_wrap = 0;
1129}
1130
1131static inline void cr(struct vc_data *vc)
1132{
1133 vc->vc_pos -= vc->vc_x << 1;
1134 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1135 notify_write(vc, '\r');
1da177e4
LT		 1136}
1137
1138static inline void bs(struct vc_data *vc)
1139{
1140 if (vc->vc_x) {
1141 vc->vc_pos -= 2;
1142 vc->vc_x--;
1143 vc->vc_need_wrap = 0;
b293d758 1144 notify_write(vc, '\b');
1da177e4
LT		 1145 }
1146}
1147
1148static inline void del(struct vc_data *vc)
1149{
1150 /* ignored */
1151}
1152
1153static void csi_J(struct vc_data *vc, int vpar)
1154{
1155 unsigned int count;
1156 unsigned short * start;
1157
1158 switch (vpar) {
1159 case 0: /* erase from cursor to end of display */
1160 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1161 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1162 break;
1163 case 1: /* erase from start to cursor */
1164 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1165 start = (unsigned short *)vc->vc_origin;
1da177e4 1166 break;
f8df13e0
PP		 1167 case 3: /* erase scroll-back buffer (and whole display) */
1168 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1169 vc->vc_screenbuf_size >> 1);
1170 set_origin(vc);
0930b095
PP		 1171 if (CON_IS_VISIBLE(vc))
1172 update_screen(vc);
f8df13e0 1173 /* fall through */
1da177e4
LT		 1174 case 2: /* erase whole display */
1175 count = vc->vc_cols * vc->vc_rows;
1176 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1177 break;
1178 default:
1179 return;
1180 }
1181 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
81732c3b
JFM		 1182 if (DO_UPDATE(vc))
1183 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1184 vc->vc_need_wrap = 0;
1185}
1186
1187static void csi_K(struct vc_data *vc, int vpar)
1188{
1189 unsigned int count;
1190 unsigned short * start;
1191
1192 switch (vpar) {
1193 case 0: /* erase from cursor to end of line */
1194 count = vc->vc_cols - vc->vc_x;
1195 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1196 break;
1197 case 1: /* erase from start of line to cursor */
1198 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1199 count = vc->vc_x + 1;
1da177e4
LT		 1200 break;
1201 case 2: /* erase whole line */
1202 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1203 count = vc->vc_cols;
1da177e4
LT		 1204 break;
1205 default:
1206 return;
1207 }
1208 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1209 vc->vc_need_wrap = 0;
81732c3b
JFM		 1210 if (DO_UPDATE(vc))
1211 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1212}
1213
1214static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1215{ /* not vt100? */
1216 int count;
1217
1218 if (!vpar)
1219 vpar++;
1220 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1221
1222 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1223 if (DO_UPDATE(vc))
1224 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1225 vc->vc_need_wrap = 0;
1226}
1227
1228static void default_attr(struct vc_data *vc)
1229{
1230 vc->vc_intensity = 1;
fa6ce9ab 1231 vc->vc_italic = 0;
1da177e4
LT		 1232 vc->vc_underline = 0;
1233 vc->vc_reverse = 0;
1234 vc->vc_blink = 0;
1235 vc->vc_color = vc->vc_def_color;
1236}
1237
cec5b2a9
AB		 1238struct rgb { u8 r; u8 g; u8 b; };
1239
678afb9a 1240static struct rgb rgb_from_256(int i)
cec5b2a9
AB		 1241{
1242 struct rgb c;
1243 if (i < 8) { /* Standard colours. */
1244 c.r = i&1 ? 0xaa : 0x00;
1245 c.g = i&2 ? 0xaa : 0x00;
1246 c.b = i&4 ? 0xaa : 0x00;
1247 } else if (i < 16) {
1248 c.r = i&1 ? 0xff : 0x55;
1249 c.g = i&2 ? 0xff : 0x55;
1250 c.b = i&4 ? 0xff : 0x55;
1251 } else if (i < 232) { /* 6x6x6 colour cube. */
1252 c.r = (i - 16) / 36 * 85 / 2;
1253 c.g = (i - 16) / 6 % 6 * 85 / 2;
1254 c.b = (i - 16) % 6 * 85 / 2;
1255 } else /* Grayscale ramp. */
1256 c.r = c.g = c.b = i * 10 - 2312;
1257 return c;
1258}
1259
1260static void rgb_foreground(struct vc_data *vc, struct rgb c)
1261{
1262 u8 hue, max = c.r;
1263 if (c.g > max)
1264 max = c.g;
1265 if (c.b > max)
1266 max = c.b;
1267 hue = (c.r > max/2 ? 4 : 0)
1268 | (c.g > max/2 ? 2 : 0)
1269 | (c.b > max/2 ? 1 : 0);
1270 if (hue == 7 && max <= 0x55)
1271 hue = 0, vc->vc_intensity = 2;
1272 else
1273 vc->vc_intensity = (max > 0xaa) + 1;
1274 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1275}
1276
1277static void rgb_background(struct vc_data *vc, struct rgb c)
1278{
1279 /* For backgrounds, err on the dark side. */
1280 vc->vc_color = (vc->vc_color & 0x0f)
1281 | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1282}
1283
ac751efa 1284/* console_lock is held */
1da177e4
LT		 1285static void csi_m(struct vc_data *vc)
1286{
1287 int i;
1288
1289 for (i = 0; i <= vc->vc_npar; i++)
1290 switch (vc->vc_par[i]) {
1291 case 0: /* all attributes off */
1292 default_attr(vc);
1293 break;
1294 case 1:
1295 vc->vc_intensity = 2;
1296 break;
1297 case 2:
1298 vc->vc_intensity = 0;
1299 break;
fa6ce9ab
JE		 1300 case 3:
1301 vc->vc_italic = 1;
1302 break;
1da177e4
LT		 1303 case 4:
1304 vc->vc_underline = 1;
1305 break;
1306 case 5:
1307 vc->vc_blink = 1;
1308 break;
1309 case 7:
1310 vc->vc_reverse = 1;
1311 break;
1312 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1313 * Select primary font, don't display
1314 * control chars if defined, don't set
1315 * bit 8 on output.
1316 */
1317 vc->vc_translate = set_translate(vc->vc_charset == 0
1318 ? vc->vc_G0_charset
1319 : vc->vc_G1_charset, vc);
1320 vc->vc_disp_ctrl = 0;
1321 vc->vc_toggle_meta = 0;
1322 break;
1323 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1324 * Select first alternate font, lets
1325 * chars < 32 be displayed as ROM chars.
1326 */
1327 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1328 vc->vc_disp_ctrl = 1;
1329 vc->vc_toggle_meta = 0;
1330 break;
1331 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1332 * Select second alternate font, toggle
1333 * high bit before displaying as ROM char.
1334 */
1335 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1336 vc->vc_disp_ctrl = 1;
1337 vc->vc_toggle_meta = 1;
1338 break;
1339 case 21:
1340 case 22:
1341 vc->vc_intensity = 1;
1342 break;
fa6ce9ab
JE		 1343 case 23:
1344 vc->vc_italic = 0;
1345 break;
1da177e4
LT		 1346 case 24:
1347 vc->vc_underline = 0;
1348 break;
1349 case 25:
1350 vc->vc_blink = 0;
1351 break;
1352 case 27:
1353 vc->vc_reverse = 0;
1354 break;
cec5b2a9 1355 case 38: /* ITU T.416
3415097f
AB		 1356 * Higher colour modes.
1357 * They break the usual properties of SGR codes
1358 * and thus need to be detected and ignored by
1359 * hand. Strictly speaking, that standard also
1360 * wants : rather than ; as separators, contrary
1361 * to ECMA-48, but no one produces such codes
1362 * and almost no one accepts them.
1363 */
1364 i++;
1365 if (i > vc->vc_npar)
1366 break;
cec5b2a9
AB		 1367 if (vc->vc_par[i] == 5 && /* 256 colours */
1368 i < vc->vc_npar) { /* ubiquitous */
1369 i++;
1370 rgb_foreground(vc,
1371 rgb_from_256(vc->vc_par[i]));
1372 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1373 i <= vc->vc_npar + 3) {/* extremely rare */
085f4d84
PF		 1374 struct rgb c = {
1375 .r = vc->vc_par[i + 1],
1376 .g = vc->vc_par[i + 2],
1377 .b = vc->vc_par[i + 3],
1378 };
cec5b2a9
AB		 1379 rgb_foreground(vc, c);
1380 i += 3;
1381 }
3415097f 1382 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
cec5b2a9 1383 * there's no point in supporting them.
3415097f
AB		 1384 */
1385 break;
cec5b2a9
AB		 1386 case 48:
1387 i++;
1388 if (i > vc->vc_npar)
1389 break;
1390 if (vc->vc_par[i] == 5 && /* 256 colours */
1391 i < vc->vc_npar) {
1392 i++;
1393 rgb_background(vc,
1394 rgb_from_256(vc->vc_par[i]));
1395 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1396 i <= vc->vc_npar + 3) {
085f4d84
PF		 1397 struct rgb c = {
1398 .r = vc->vc_par[i + 1],
1399 .g = vc->vc_par[i + 2],
1400 .b = vc->vc_par[i + 3],
1401 };
cec5b2a9
AB		 1402 rgb_background(vc, c);
1403 i += 3;
1404 }
1405 break;
64545880 1406 case 39:
1da177e4 1407 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1da177e4
LT		 1408 break;
1409 case 49:
1410 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1411 break;
1412 default:
1413 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1414 vc->vc_color = color_table[vc->vc_par[i] - 30]
1415 | (vc->vc_color & 0xf0);
1416 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1417 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1418 | (vc->vc_color & 0x0f);
1419 break;
1420 }
1421 update_attr(vc);
1422}
1423
6732c8bb 1424static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1425{
1426 while (*p) {
6732c8bb 1427 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1428 p++;
1429 }
6732c8bb 1430 tty_schedule_flip(port);
1da177e4
LT		 1431}
1432
1433static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1434{
1435 char buf[40];
1436
1437 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1438 respond_string(buf, tty->port);
1da177e4
LT		 1439}
1440
1441static inline void status_report(struct tty_struct *tty)
1442{
6732c8bb 1443 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1444}
1445
6732c8bb 1446static inline void respond_ID(struct tty_struct *tty)
1da177e4 1447{
6732c8bb 1448 respond_string(VT102ID, tty->port);
1da177e4
LT		 1449}
1450
1451void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1452{
1453 char buf[8];
1454
1455 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1456 (char)('!' + mry));
6732c8bb 1457 respond_string(buf, tty->port);
1da177e4
LT		 1458}
1459
1460/* invoked via ioctl(TIOCLINUX) and through set_selection */
1461int mouse_reporting(void)
1462{
1463 return vc_cons[fg_console].d->vc_report_mouse;
1464}
1465
ac751efa 1466/* console_lock is held */
1da177e4
LT		 1467static void set_mode(struct vc_data *vc, int on_off)
1468{
1469 int i;
1470
1471 for (i = 0; i <= vc->vc_npar; i++)
1472 if (vc->vc_ques) {
1473 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1474 case 1: /* Cursor keys send ^[Ox/^[[x */
1475 if (on_off)
1476 set_kbd(vc, decckm);
1477 else
1478 clr_kbd(vc, decckm);
1479 break;
1480 case 3: /* 80/132 mode switch unimplemented */
1481 vc->vc_deccolm = on_off;
1482#if 0
1483 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1484 /* this alone does not suffice; some user mode
1485 utility has to change the hardware regs */
1486#endif
1487 break;
1488 case 5: /* Inverted screen on/off */
1489 if (vc->vc_decscnm != on_off) {
1490 vc->vc_decscnm = on_off;
1491 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1492 update_attr(vc);
1493 }
1494 break;
1495 case 6: /* Origin relative/absolute */
1496 vc->vc_decom = on_off;
1497 gotoxay(vc, 0, 0);
1498 break;
1499 case 7: /* Autowrap on/off */
1500 vc->vc_decawm = on_off;
1501 break;
1502 case 8: /* Autorepeat on/off */
1503 if (on_off)
1504 set_kbd(vc, decarm);
1505 else
1506 clr_kbd(vc, decarm);
1507 break;
1508 case 9:
1509 vc->vc_report_mouse = on_off ? 1 : 0;
1510 break;
1511 case 25: /* Cursor on/off */
1512 vc->vc_deccm = on_off;
1513 break;
1514 case 1000:
1515 vc->vc_report_mouse = on_off ? 2 : 0;
1516 break;
1517 }
1518 } else {
1519 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1520 case 3: /* Monitor (display ctrls) */
1521 vc->vc_disp_ctrl = on_off;
1522 break;
1523 case 4: /* Insert Mode on/off */
1524 vc->vc_decim = on_off;
1525 break;
1526 case 20: /* Lf, Enter == CrLf/Lf */
1527 if (on_off)
1528 set_kbd(vc, lnm);
1529 else
1530 clr_kbd(vc, lnm);
1531 break;
1532 }
1533 }
1534}
1535
ac751efa 1536/* console_lock is held */
1da177e4
LT		 1537static void setterm_command(struct vc_data *vc)
1538{
1539 switch(vc->vc_par[0]) {
1540 case 1: /* set color for underline mode */
1541 if (vc->vc_can_do_color &&
1542 vc->vc_par[1] < 16) {
1543 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1544 if (vc->vc_underline)
1545 update_attr(vc);
1546 }
1547 break;
1548 case 2: /* set color for half intensity mode */
1549 if (vc->vc_can_do_color &&
1550 vc->vc_par[1] < 16) {
1551 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1552 if (vc->vc_intensity == 0)
1553 update_attr(vc);
1554 }
1555 break;
1556 case 8: /* store colors as defaults */
1557 vc->vc_def_color = vc->vc_attr;
1558 if (vc->vc_hi_font_mask == 0x100)
1559 vc->vc_def_color >>= 1;
1560 default_attr(vc);
1561 update_attr(vc);
1562 break;
1563 case 9: /* set blanking interval */
f324edc8 1564 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1565 poke_blanked_console();
1566 break;
1567 case 10: /* set bell frequency in Hz */
1568 if (vc->vc_npar >= 1)
1569 vc->vc_bell_pitch = vc->vc_par[1];
1570 else
1571 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1572 break;
1573 case 11: /* set bell duration in msec */
1574 if (vc->vc_npar >= 1)
1575 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
3372ec28 1576 msecs_to_jiffies(vc->vc_par[1]) : 0;
1da177e4
LT		 1577 else
1578 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1579 break;
1580 case 12: /* bring specified console to the front */
1581 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1582 set_console(vc->vc_par[1] - 1);
1583 break;
1584 case 13: /* unblank the screen */
1585 poke_blanked_console();
1586 break;
1587 case 14: /* set vesa powerdown interval */
1588 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1589 break;
1590 case 15: /* activate the previous console */
1591 set_console(last_console);
1592 break;
1593 }
1594}
1595
ac751efa 1596/* console_lock is held */
1da177e4
LT		 1597static void csi_at(struct vc_data *vc, unsigned int nr)
1598{
1599 if (nr > vc->vc_cols - vc->vc_x)
1600 nr = vc->vc_cols - vc->vc_x;
1601 else if (!nr)
1602 nr = 1;
1603 insert_char(vc, nr);
1604}
1605
ac751efa 1606/* console_lock is held */
1da177e4
LT		 1607static void csi_L(struct vc_data *vc, unsigned int nr)
1608{
1609 if (nr > vc->vc_rows - vc->vc_y)
1610 nr = vc->vc_rows - vc->vc_y;
1611 else if (!nr)
1612 nr = 1;
1613 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1614 vc->vc_need_wrap = 0;
1615}
1616
ac751efa 1617/* console_lock is held */
1da177e4
LT		 1618static void csi_P(struct vc_data *vc, unsigned int nr)
1619{
1620 if (nr > vc->vc_cols - vc->vc_x)
1621 nr = vc->vc_cols - vc->vc_x;
1622 else if (!nr)
1623 nr = 1;
1624 delete_char(vc, nr);
1625}
1626
ac751efa 1627/* console_lock is held */
1da177e4
LT		 1628static void csi_M(struct vc_data *vc, unsigned int nr)
1629{
1630 if (nr > vc->vc_rows - vc->vc_y)
1631 nr = vc->vc_rows - vc->vc_y;
1632 else if (!nr)
1633 nr=1;
1634 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1635 vc->vc_need_wrap = 0;
1636}
1637
ac751efa 1638/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1639static void save_cur(struct vc_data *vc)
1640{
1641 vc->vc_saved_x = vc->vc_x;
1642 vc->vc_saved_y = vc->vc_y;
1643 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1644 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1645 vc->vc_s_underline = vc->vc_underline;
1646 vc->vc_s_blink = vc->vc_blink;
1647 vc->vc_s_reverse = vc->vc_reverse;
1648 vc->vc_s_charset = vc->vc_charset;
1649 vc->vc_s_color = vc->vc_color;
1650 vc->vc_saved_G0 = vc->vc_G0_charset;
1651 vc->vc_saved_G1 = vc->vc_G1_charset;
1652}
1653
ac751efa 1654/* console_lock is held */
1da177e4
LT		 1655static void restore_cur(struct vc_data *vc)
1656{
1657 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1658 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1659 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1660 vc->vc_underline = vc->vc_s_underline;
1661 vc->vc_blink = vc->vc_s_blink;
1662 vc->vc_reverse = vc->vc_s_reverse;
1663 vc->vc_charset = vc->vc_s_charset;
1664 vc->vc_color = vc->vc_s_color;
1665 vc->vc_G0_charset = vc->vc_saved_G0;
1666 vc->vc_G1_charset = vc->vc_saved_G1;
1667 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1668 update_attr(vc);
1669 vc->vc_need_wrap = 0;
1670}
1671
b290af68 1672enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1da177e4 1673 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
63f3a16d 1674 ESpalette, ESosc };
1da177e4 1675
ac751efa 1676/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1677static void reset_terminal(struct vc_data *vc, int do_clear)
1678{
1679 vc->vc_top = 0;
1680 vc->vc_bottom = vc->vc_rows;
1681 vc->vc_state = ESnormal;
1682 vc->vc_ques = 0;
1683 vc->vc_translate = set_translate(LAT1_MAP, vc);
1684 vc->vc_G0_charset = LAT1_MAP;
1685 vc->vc_G1_charset = GRAF_MAP;
1686 vc->vc_charset = 0;
1687 vc->vc_need_wrap = 0;
1688 vc->vc_report_mouse = 0;
042f10ec 1689 vc->vc_utf = default_utf8;
1da177e4
LT		 1690 vc->vc_utf_count = 0;
1691
1692 vc->vc_disp_ctrl = 0;
1693 vc->vc_toggle_meta = 0;
1694
1695 vc->vc_decscnm = 0;
1696 vc->vc_decom = 0;
1697 vc->vc_decawm = 1;
f6c06b68 1698 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1699 vc->vc_decim = 0;
1700
079c9534 1701 vt_reset_keyboard(vc->vc_num);
1da177e4 1702
9ea9a886 1703 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1704 vc->vc_complement_mask = vc->vc_s_complement_mask;
1705
1706 default_attr(vc);
1707 update_attr(vc);
1708
1709 vc->vc_tab_stop[0] = 0x01010100;
1710 vc->vc_tab_stop[1] =
1711 vc->vc_tab_stop[2] =
1712 vc->vc_tab_stop[3] =
a564738c
WK		 1713 vc->vc_tab_stop[4] =
1714 vc->vc_tab_stop[5] =
1715 vc->vc_tab_stop[6] =
1716 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1717
1718 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1719 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1720
1721 gotoxy(vc, 0, 0);
1722 save_cur(vc);
1723 if (do_clear)
1724 csi_J(vc, 2);
1725}
1726
ac751efa 1727/* console_lock is held */
1da177e4
LT		 1728static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1729{
1730 /*
1731 * Control characters can be used in the _middle_
1732 * of an escape sequence.
1733 */
63f3a16d
AB		 1734 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1735 return;
1da177e4
LT		 1736 switch (c) {
1737 case 0:
1738 return;
1739 case 7:
63f3a16d
AB		 1740 if (vc->vc_state == ESosc)
1741 vc->vc_state = ESnormal;
1742 else if (vc->vc_bell_duration)
1da177e4
LT		 1743 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1744 return;
1745 case 8:
1746 bs(vc);
1747 return;
1748 case 9:
1749 vc->vc_pos -= (vc->vc_x << 1);
1750 while (vc->vc_x < vc->vc_cols - 1) {
1751 vc->vc_x++;
1752 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1753 break;
1754 }
1755 vc->vc_pos += (vc->vc_x << 1);
b293d758 1756 notify_write(vc, '\t');
1da177e4
LT		 1757 return;
1758 case 10: case 11: case 12:
1759 lf(vc);
1760 if (!is_kbd(vc, lnm))
1761 return;
1762 case 13:
1763 cr(vc);
1764 return;
1765 case 14:
1766 vc->vc_charset = 1;
1767 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1768 vc->vc_disp_ctrl = 1;
1769 return;
1770 case 15:
1771 vc->vc_charset = 0;
1772 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1773 vc->vc_disp_ctrl = 0;
1774 return;
1775 case 24: case 26:
1776 vc->vc_state = ESnormal;
1777 return;
1778 case 27:
1779 vc->vc_state = ESesc;
1780 return;
1781 case 127:
1782 del(vc);
1783 return;
1784 case 128+27:
1785 vc->vc_state = ESsquare;
1786 return;
1787 }
1788 switch(vc->vc_state) {
1789 case ESesc:
1790 vc->vc_state = ESnormal;
1791 switch (c) {
1792 case '[':
1793 vc->vc_state = ESsquare;
1794 return;
1795 case ']':
1796 vc->vc_state = ESnonstd;
1797 return;
1798 case '%':
1799 vc->vc_state = ESpercent;
1800 return;
1801 case 'E':
1802 cr(vc);
1803 lf(vc);
1804 return;
1805 case 'M':
1806 ri(vc);
1807 return;
1808 case 'D':
1809 lf(vc);
1810 return;
1811 case 'H':
1812 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1813 return;
1814 case 'Z':
1815 respond_ID(tty);
1816 return;
1817 case '7':
1818 save_cur(vc);
1819 return;
1820 case '8':
1821 restore_cur(vc);
1822 return;
1823 case '(':
1824 vc->vc_state = ESsetG0;
1825 return;
1826 case ')':
1827 vc->vc_state = ESsetG1;
1828 return;
1829 case '#':
1830 vc->vc_state = EShash;
1831 return;
1832 case 'c':
1833 reset_terminal(vc, 1);
1834 return;
1835 case '>': /* Numeric keypad */
1836 clr_kbd(vc, kbdapplic);
1837 return;
1838 case '=': /* Appl. keypad */
1839 set_kbd(vc, kbdapplic);
1840 return;
1841 }
1842 return;
1843 case ESnonstd:
1844 if (c=='P') { /* palette escape sequence */
1845 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1846 vc->vc_par[vc->vc_npar] = 0;
1847 vc->vc_npar = 0;
1848 vc->vc_state = ESpalette;
1849 return;
1850 } else if (c=='R') { /* reset palette */
1851 reset_palette(vc);
1852 vc->vc_state = ESnormal;
63f3a16d
AB		 1853 } else if (c>='0' && c<='9')
1854 vc->vc_state = ESosc;
1855 else
1da177e4
LT		 1856 vc->vc_state = ESnormal;
1857 return;
1858 case ESpalette:
74c807ce
AS		 1859 if (isxdigit(c)) {
1860 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1861 if (vc->vc_npar == 7) {
1862 int i = vc->vc_par[0] * 3, j = 1;
1863 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1864 vc->vc_palette[i++] += vc->vc_par[j++];
1865 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1866 vc->vc_palette[i++] += vc->vc_par[j++];
1867 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1868 vc->vc_palette[i] += vc->vc_par[j];
1869 set_palette(vc);
1870 vc->vc_state = ESnormal;
1871 }
1872 } else
1873 vc->vc_state = ESnormal;
1874 return;
1875 case ESsquare:
1876 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1877 vc->vc_par[vc->vc_npar] = 0;
1878 vc->vc_npar = 0;
1879 vc->vc_state = ESgetpars;
1880 if (c == '[') { /* Function key */
1881 vc->vc_state=ESfunckey;
1882 return;
1883 }
1884 vc->vc_ques = (c == '?');
1885 if (vc->vc_ques)
1886 return;
1887 case ESgetpars:
1888 if (c == ';' && vc->vc_npar < NPAR - 1) {
1889 vc->vc_npar++;
1890 return;
1891 } else if (c>='0' && c<='9') {
1892 vc->vc_par[vc->vc_npar] *= 10;
1893 vc->vc_par[vc->vc_npar] += c - '0';
1894 return;
b290af68 1895 }
1da177e4
LT		 1896 vc->vc_state = ESnormal;
1897 switch(c) {
1898 case 'h':
1899 set_mode(vc, 1);
1900 return;
1901 case 'l':
1902 set_mode(vc, 0);
1903 return;
1904 case 'c':
1905 if (vc->vc_ques) {
1906 if (vc->vc_par[0])
1907 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1908 else
9ea9a886 1909 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1910 return;
1911 }
1912 break;
1913 case 'm':
1914 if (vc->vc_ques) {
1915 clear_selection();
1916 if (vc->vc_par[0])
1917 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1918 else
1919 vc->vc_complement_mask = vc->vc_s_complement_mask;
1920 return;
1921 }
1922 break;
1923 case 'n':
1924 if (!vc->vc_ques) {
1925 if (vc->vc_par[0] == 5)
1926 status_report(tty);
1927 else if (vc->vc_par[0] == 6)
1928 cursor_report(vc, tty);
1929 }
1930 return;
1931 }
1932 if (vc->vc_ques) {
1933 vc->vc_ques = 0;
1934 return;
1935 }
1936 switch(c) {
1937 case 'G': case '`':
1938 if (vc->vc_par[0])
1939 vc->vc_par[0]--;
1940 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1941 return;
1942 case 'A':
1943 if (!vc->vc_par[0])
1944 vc->vc_par[0]++;
1945 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1946 return;
1947 case 'B': case 'e':
1948 if (!vc->vc_par[0])
1949 vc->vc_par[0]++;
1950 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1951 return;
1952 case 'C': case 'a':
1953 if (!vc->vc_par[0])
1954 vc->vc_par[0]++;
1955 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1956 return;
1957 case 'D':
1958 if (!vc->vc_par[0])
1959 vc->vc_par[0]++;
1960 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1961 return;
1962 case 'E':
1963 if (!vc->vc_par[0])
1964 vc->vc_par[0]++;
1965 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1966 return;
1967 case 'F':
1968 if (!vc->vc_par[0])
1969 vc->vc_par[0]++;
1970 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1971 return;
1972 case 'd':
1973 if (vc->vc_par[0])
1974 vc->vc_par[0]--;
1975 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1976 return;
1977 case 'H': case 'f':
1978 if (vc->vc_par[0])
1979 vc->vc_par[0]--;
1980 if (vc->vc_par[1])
1981 vc->vc_par[1]--;
1982 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1983 return;
1984 case 'J':
1985 csi_J(vc, vc->vc_par[0]);
1986 return;
1987 case 'K':
1988 csi_K(vc, vc->vc_par[0]);
1989 return;
1990 case 'L':
1991 csi_L(vc, vc->vc_par[0]);
1992 return;
1993 case 'M':
1994 csi_M(vc, vc->vc_par[0]);
1995 return;
1996 case 'P':
1997 csi_P(vc, vc->vc_par[0]);
1998 return;
1999 case 'c':
2000 if (!vc->vc_par[0])
2001 respond_ID(tty);
2002 return;
2003 case 'g':
2004 if (!vc->vc_par[0])
2005 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2006 else if (vc->vc_par[0] == 3) {
2007 vc->vc_tab_stop[0] =
2008 vc->vc_tab_stop[1] =
2009 vc->vc_tab_stop[2] =
2010 vc->vc_tab_stop[3] =
a564738c
WK		 2011 vc->vc_tab_stop[4] =
2012 vc->vc_tab_stop[5] =
2013 vc->vc_tab_stop[6] =
2014 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 2015 }
2016 return;
2017 case 'm':
2018 csi_m(vc);
2019 return;
2020 case 'q': /* DECLL - but only 3 leds */
2021 /* map 0,1,2,3 to 0,1,2,4 */
2022 if (vc->vc_par[0] < 4)
079c9534 2023 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2024 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2025 return;
2026 case 'r':
2027 if (!vc->vc_par[0])
2028 vc->vc_par[0]++;
2029 if (!vc->vc_par[1])
2030 vc->vc_par[1] = vc->vc_rows;
2031 /* Minimum allowed region is 2 lines */
2032 if (vc->vc_par[0] < vc->vc_par[1] &&
2033 vc->vc_par[1] <= vc->vc_rows) {
2034 vc->vc_top = vc->vc_par[0] - 1;
2035 vc->vc_bottom = vc->vc_par[1];
2036 gotoxay(vc, 0, 0);
2037 }
2038 return;
2039 case 's':
2040 save_cur(vc);
2041 return;
2042 case 'u':
2043 restore_cur(vc);
2044 return;
2045 case 'X':
2046 csi_X(vc, vc->vc_par[0]);
2047 return;
2048 case '@':
2049 csi_at(vc, vc->vc_par[0]);
2050 return;
2051 case ']': /* setterm functions */
2052 setterm_command(vc);
2053 return;
2054 }
2055 return;
2056 case ESpercent:
2057 vc->vc_state = ESnormal;
2058 switch (c) {
2059 case '@': /* defined in ISO 2022 */
2060 vc->vc_utf = 0;
2061 return;
2062 case 'G': /* prelim official escape code */
2063 case '8': /* retained for compatibility */
2064 vc->vc_utf = 1;
2065 return;
2066 }
2067 return;
2068 case ESfunckey:
2069 vc->vc_state = ESnormal;
2070 return;
2071 case EShash:
2072 vc->vc_state = ESnormal;
2073 if (c == '8') {
2074 /* DEC screen alignment test. kludge :-) */
2075 vc->vc_video_erase_char =
2076 (vc->vc_video_erase_char & 0xff00) | 'E';
2077 csi_J(vc, 2);
2078 vc->vc_video_erase_char =
2079 (vc->vc_video_erase_char & 0xff00) | ' ';
2080 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2081 }
2082 return;
2083 case ESsetG0:
2084 if (c == '0')
2085 vc->vc_G0_charset = GRAF_MAP;
2086 else if (c == 'B')
2087 vc->vc_G0_charset = LAT1_MAP;
2088 else if (c == 'U')
2089 vc->vc_G0_charset = IBMPC_MAP;
2090 else if (c == 'K')
2091 vc->vc_G0_charset = USER_MAP;
2092 if (vc->vc_charset == 0)
2093 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2094 vc->vc_state = ESnormal;
2095 return;
2096 case ESsetG1:
2097 if (c == '0')
2098 vc->vc_G1_charset = GRAF_MAP;
2099 else if (c == 'B')
2100 vc->vc_G1_charset = LAT1_MAP;
2101 else if (c == 'U')
2102 vc->vc_G1_charset = IBMPC_MAP;
2103 else if (c == 'K')
2104 vc->vc_G1_charset = USER_MAP;
2105 if (vc->vc_charset == 1)
2106 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2107 vc->vc_state = ESnormal;
2108 return;
63f3a16d
AB		 2109 case ESosc:
2110 return;
1da177e4
LT		 2111 default:
2112 vc->vc_state = ESnormal;
2113 }
2114}
2115
2f1a2ccb 2116/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2117 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2118 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2119 */
2120struct interval {
2121 uint32_t first;
2122 uint32_t last;
2123};
2124
2125static int bisearch(uint32_t ucs, const struct interval *table, int max)
2126{
2127 int min = 0;
2128 int mid;
2129
2130 if (ucs < table[0].first || ucs > table[max].last)
2131 return 0;
2132 while (max >= min) {
2133 mid = (min + max) / 2;
2134 if (ucs > table[mid].last)
2135 min = mid + 1;
2136 else if (ucs < table[mid].first)
2137 max = mid - 1;
2138 else
2139 return 1;
2140 }
2141 return 0;
2142}
2143
2144static int is_double_width(uint32_t ucs)
2145{
2146 static const struct interval double_width[] = {
2147 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2148 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2149 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2150 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2151 };
0f11541b 2152 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2153}
2154
ac751efa 2155/* acquires console_lock */
1da177e4
LT		 2156static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2157{
2158#ifdef VT_BUF_VRAM_ONLY
2159#define FLUSH do { } while(0);
2160#else
2161#define FLUSH if (draw_x >= 0) { \
2162 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2163 draw_x = -1; \
2164 }
2165#endif
2166
2167 int c, tc, ok, n = 0, draw_x = -1;
2168 unsigned int currcons;
2169 unsigned long draw_from = 0, draw_to = 0;
2170 struct vc_data *vc;
2f1a2ccb 2171 unsigned char vc_attr;
0341a4d0 2172 struct vt_notifier_param param;
2f1a2ccb
EK		 2173 uint8_t rescan;
2174 uint8_t inverse;
2175 uint8_t width;
1da177e4 2176 u16 himask, charmask;
1da177e4
LT		 2177
2178 if (in_interrupt())
2179 return count;
2180
2181 might_sleep();
2182
ac751efa 2183 console_lock();
1da177e4
LT		 2184 vc = tty->driver_data;
2185 if (vc == NULL) {
2186 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2187 console_unlock();
1da177e4
LT		 2188 return 0;
2189 }
2190
2191 currcons = vc->vc_num;
2192 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2193 /* could this happen? */
2194 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2195 console_unlock();
2196 return 0;
1da177e4 2197 }
1da177e4 2198
1da177e4
LT		 2199 himask = vc->vc_hi_font_mask;
2200 charmask = himask ? 0x1ff : 0xff;
2201
2202 /* undraw cursor first */
2203 if (IS_FG(vc))
2204 hide_cursor(vc);
2205
0341a4d0
KD		 2206 param.vc = vc;
2207
1da177e4
LT		 2208 while (!tty->stopped && count) {
2209 int orig = *buf;
2210 c = orig;
2211 buf++;
2212 n++;
2213 count--;
2f1a2ccb
EK		 2214 rescan = 0;
2215 inverse = 0;
2216 width = 1;
1da177e4
LT		 2217
2218 /* Do no translation at all in control states */
2219 if (vc->vc_state != ESnormal) {
2220 tc = c;
d4328b40 2221 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2222 /* Combine UTF-8 into Unicode in vc_utf_char.
2223 * vc_utf_count is the number of continuation bytes still
2224 * expected to arrive.
2225 * vc_npar is the number of continuation bytes arrived so
2226 * far
2227 */
d4328b40 2228rescan_last_byte:
2f1a2ccb
EK		 2229 if ((c & 0xc0) == 0x80) {
2230 /* Continuation byte received */
2231 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2232 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2233 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2234 vc->vc_npar++;
2235 if (--vc->vc_utf_count) {
2236 /* Still need some bytes */
1da177e4 2237 continue;
2f1a2ccb
EK		 2238 }
2239 /* Got a whole character */
2240 c = vc->vc_utf_char;
2241 /* Reject overlong sequences */
2242 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2243 c > utf8_length_changes[vc->vc_npar])
2244 c = 0xfffd;
2245 } else {
2246 /* Unexpected continuation byte */
2247 vc->vc_utf_count = 0;
2248 c = 0xfffd;
2249 }
1da177e4 2250 } else {
2f1a2ccb
EK		 2251 /* Single ASCII byte or first byte of a sequence received */
2252 if (vc->vc_utf_count) {
2253 /* Continuation byte expected */
2254 rescan = 1;
2255 vc->vc_utf_count = 0;
2256 c = 0xfffd;
2257 } else if (c > 0x7f) {
2258 /* First byte of a multibyte sequence received */
2259 vc->vc_npar = 0;
2260 if ((c & 0xe0) == 0xc0) {
2261 vc->vc_utf_count = 1;
2262 vc->vc_utf_char = (c & 0x1f);
2263 } else if ((c & 0xf0) == 0xe0) {
2264 vc->vc_utf_count = 2;
2265 vc->vc_utf_char = (c & 0x0f);
2266 } else if ((c & 0xf8) == 0xf0) {
2267 vc->vc_utf_count = 3;
2268 vc->vc_utf_char = (c & 0x07);
2269 } else if ((c & 0xfc) == 0xf8) {
2270 vc->vc_utf_count = 4;
2271 vc->vc_utf_char = (c & 0x03);
2272 } else if ((c & 0xfe) == 0xfc) {
2273 vc->vc_utf_count = 5;
2274 vc->vc_utf_char = (c & 0x01);
2275 } else {
2276 /* 254 and 255 are invalid */
2277 c = 0xfffd;
2278 }
2279 if (vc->vc_utf_count) {
2280 /* Still need some bytes */
2281 continue;
2282 }
2283 }
2284 /* Nothing to do if an ASCII byte was received */
1da177e4 2285 }
2f1a2ccb
EK		 2286 /* End of UTF-8 decoding. */
2287 /* c is the received character, or U+FFFD for invalid sequences. */
2288 /* Replace invalid Unicode code points with U+FFFD too */
2289 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2290 c = 0xfffd;
2291 tc = c;
d4328b40 2292 } else { /* no utf or alternate charset mode */
a29ccf6f 2293 tc = vc_translate(vc, c);
1da177e4
LT		 2294 }
2295
0341a4d0
KD		 2296 param.c = tc;
2297 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2298 &param) == NOTIFY_STOP)
2299 continue;
2300
1da177e4
LT		 2301 /* If the original code was a control character we
2302 * only allow a glyph to be displayed if the code is
2303 * not normally used (such as for cursor movement) or
2304 * if the disp_ctrl mode has been explicitly enabled.
2305 * Certain characters (as given by the CTRL_ALWAYS
2306 * bitmap) are always displayed as control characters,
2307 * as the console would be pretty useless without
2308 * them; to display an arbitrary font position use the
2309 * direct-to-font zone in UTF-8 mode.
2310 */
2311 ok = tc && (c >= 32 ||
d4328b40
AT		 2312 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2313 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2314 && (c != 127 || vc->vc_disp_ctrl)
2315 && (c != 128+27);
2316
2317 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2318 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2319 if (is_double_width(c))
2320 width = 2;
2321 }
1da177e4
LT		 2322 /* Now try to find out how to display it */
2323 tc = conv_uni_to_pc(vc, tc);
d4328b40 2324 if (tc & ~charmask) {
2f1a2ccb
EK		 2325 if (tc == -1 || tc == -2) {
2326 continue; /* nothing to display */
2327 }
2328 /* Glyph not found */
c0b79882 2329 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2330 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2331 This would make absolutely no sense with Unicode in mind,
2332 but do this for ASCII characters since a font may lack
2333 Unicode mapping info and we don't want to end up with
2334 having question marks only. */
2f1a2ccb
EK		 2335 tc = c;
2336 } else {
2337 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2338 tc = conv_uni_to_pc(vc, 0xfffd);
2339 if (tc < 0) {
2340 inverse = 1;
2341 tc = conv_uni_to_pc(vc, '?');
2342 if (tc < 0) tc = '?';
2343 }
2344 }
d4328b40 2345 }
1da177e4 2346
2f1a2ccb
EK		 2347 if (!inverse) {
2348 vc_attr = vc->vc_attr;
1da177e4 2349 } else {
2f1a2ccb
EK		 2350 /* invert vc_attr */
2351 if (!vc->vc_can_do_color) {
2352 vc_attr = (vc->vc_attr) ^ 0x08;
2353 } else if (vc->vc_hi_font_mask == 0x100) {
2354 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2355 } else {
2356 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2357 }
1ed8a2b3 2358 FLUSH
1da177e4 2359 }
2f1a2ccb
EK		 2360
2361 while (1) {
2362 if (vc->vc_need_wrap || vc->vc_decim)
2363 FLUSH
2364 if (vc->vc_need_wrap) {
2365 cr(vc);
2366 lf(vc);
2367 }
2368 if (vc->vc_decim)
2369 insert_char(vc, 1);
2370 scr_writew(himask ?
2371 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2372 (vc_attr << 8) + tc,
2373 (u16 *) vc->vc_pos);
2374 if (DO_UPDATE(vc) && draw_x < 0) {
2375 draw_x = vc->vc_x;
2376 draw_from = vc->vc_pos;
2377 }
2378 if (vc->vc_x == vc->vc_cols - 1) {
2379 vc->vc_need_wrap = vc->vc_decawm;
2380 draw_to = vc->vc_pos + 2;
2381 } else {
2382 vc->vc_x++;
2383 draw_to = (vc->vc_pos += 2);
d4328b40 2384 }
2f1a2ccb
EK		 2385
2386 if (!--width) break;
2387
2388 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2389 if (tc < 0) tc = ' ';
2390 }
b293d758 2391 notify_write(vc, c);
2f1a2ccb 2392
1ed8a2b3
EK		 2393 if (inverse) {
2394 FLUSH
2395 }
2396
2f1a2ccb
EK		 2397 if (rescan) {
2398 rescan = 0;
2399 inverse = 0;
2400 width = 1;
d4328b40
AT		 2401 c = orig;
2402 goto rescan_last_byte;
2403 }
1da177e4
LT		 2404 continue;
2405 }
2406 FLUSH
2407 do_con_trol(tty, vc, orig);
2408 }
2409 FLUSH
2410 console_conditional_schedule();
ac751efa 2411 console_unlock();
b293d758 2412 notify_update(vc);
1da177e4
LT		 2413 return n;
2414#undef FLUSH
2415}
2416
2417/*
2418 * This is the console switching callback.
2419 *
2420 * Doing console switching in a process context allows
2421 * us to do the switches asynchronously (needed when we want
2422 * to switch due to a keyboard interrupt). Synchronization
2423 * with other console code and prevention of re-entrancy is
ac751efa 2424 * ensured with console_lock.
1da177e4 2425 */
65f27f38 2426static void console_callback(struct work_struct *ignored)
1da177e4 2427{
ac751efa 2428 console_lock();
1da177e4
LT		 2429
2430 if (want_console >= 0) {
2431 if (want_console != fg_console &&
2432 vc_cons_allocated(want_console)) {
2433 hide_cursor(vc_cons[fg_console].d);
2434 change_console(vc_cons[want_console].d);
2435 /* we only changed when the console had already
2436 been allocated - a new console is not created
2437 in an interrupt routine */
2438 }
2439 want_console = -1;
2440 }
2441 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2442 do_poke_blanked_console = 0;
2443 poke_blanked_console();
2444 }
2445 if (scrollback_delta) {
2446 struct vc_data *vc = vc_cons[fg_console].d;
2447 clear_selection();
2448 if (vc->vc_mode == KD_TEXT)
2449 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2450 scrollback_delta = 0;
2451 }
2452 if (blank_timer_expired) {
2453 do_blank_screen(0);
2454 blank_timer_expired = 0;
2455 }
b293d758 2456 notify_update(vc_cons[fg_console].d);
1da177e4 2457
ac751efa 2458 console_unlock();
1da177e4
LT		 2459}
2460
b257bc05 2461int set_console(int nr)
1da177e4 2462{
b257bc05
AJ		 2463 struct vc_data *vc = vc_cons[fg_console].d;
2464
2465 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2466 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2467
2468 /*
2469 * Console switch will fail in console_callback() or
2470 * change_console() so there is no point scheduling
2471 * the callback
2472 *
2473 * Existing set_console() users don't check the return
2474 * value so this shouldn't break anything
2475 */
2476 return -EINVAL;
2477 }
2478
1da177e4
LT		 2479 want_console = nr;
2480 schedule_console_callback();
b257bc05
AJ		 2481
2482 return 0;
1da177e4
LT		 2483}
2484
2485struct tty_driver *console_driver;
2486
2487#ifdef CONFIG_VT_CONSOLE
2488
5ada918b
BW		 2489/**
2490 * vt_kmsg_redirect() - Sets/gets the kernel message console
2491 * @new: The new virtual terminal number or -1 if the console should stay
2492 * unchanged
2493 *
2494 * By default, the kernel messages are always printed on the current virtual
2495 * console. However, the user may modify that default with the
2496 * TIOCL_SETKMSGREDIRECT ioctl call.
2497 *
2498 * This function sets the kernel message console to be @new. It returns the old
2499 * virtual console number. The virtual terminal number 0 (both as parameter and
2500 * return value) means no redirection (i.e. always printed on the currently
2501 * active console).
2502 *
2503 * The parameter -1 means that only the current console is returned, but the
2504 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2505 * case to make the code more understandable.
2506 *
2507 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2508 * the parameter and always returns 0.
2509 */
2510int vt_kmsg_redirect(int new)
2511{
2512 static int kmsg_con;
2513
2514 if (new != -1)
2515 return xchg(&kmsg_con, new);
2516 else
2517 return kmsg_con;
2518}
2519
1da177e4
LT		 2520/*
2521 * Console on virtual terminal
2522 *
2523 * The console must be locked when we get here.
2524 */
2525
2526static void vt_console_print(struct console *co, const char *b, unsigned count)
2527{
2528 struct vc_data *vc = vc_cons[fg_console].d;
2529 unsigned char c;
b0940003 2530 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2531 const ushort *start;
2532 ushort cnt = 0;
2533 ushort myx;
5ada918b 2534 int kmsg_console;
1da177e4
LT		 2535
2536 /* console busy or not yet initialized */
b0940003
NP		 2537 if (!printable)
2538 return;
2539 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2540 return;
2541
5ada918b
BW		 2542 kmsg_console = vt_get_kmsg_redirect();
2543 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2544 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2545
2546 /* read `x' only after setting currcons properly (otherwise
2547 the `x' macro will read the x of the foreground console). */
2548 myx = vc->vc_x;
2549
2550 if (!vc_cons_allocated(fg_console)) {
2551 /* impossible */
2552 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2553 goto quit;
2554 }
2555
8fd4bd22 2556 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2557 goto quit;
2558
2559 /* undraw cursor first */
2560 if (IS_FG(vc))
2561 hide_cursor(vc);
2562
2563 start = (ushort *)vc->vc_pos;
2564
2565 /* Contrived structure to try to emulate original need_wrap behaviour
2566 * Problems caused when we have need_wrap set on '\n' character */
2567 while (count--) {
2568 c = *b++;
2569 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2570 if (cnt > 0) {
2571 if (CON_IS_VISIBLE(vc))
2572 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2573 vc->vc_x += cnt;
2574 if (vc->vc_need_wrap)
2575 vc->vc_x--;
2576 cnt = 0;
2577 }
2578 if (c == 8) { /* backspace */
2579 bs(vc);
2580 start = (ushort *)vc->vc_pos;
2581 myx = vc->vc_x;
2582 continue;
2583 }
2584 if (c != 13)
2585 lf(vc);
2586 cr(vc);
2587 start = (ushort *)vc->vc_pos;
2588 myx = vc->vc_x;
2589 if (c == 10 || c == 13)
2590 continue;
2591 }
2592 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2593 notify_write(vc, c);
1da177e4
LT		 2594 cnt++;
2595 if (myx == vc->vc_cols - 1) {
2596 vc->vc_need_wrap = 1;
2597 continue;
2598 }
2599 vc->vc_pos += 2;
2600 myx++;
2601 }
2602 if (cnt > 0) {
2603 if (CON_IS_VISIBLE(vc))
2604 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2605 vc->vc_x += cnt;
2606 if (vc->vc_x == vc->vc_cols) {
2607 vc->vc_x--;
2608 vc->vc_need_wrap = 1;
2609 }
2610 }
2611 set_cursor(vc);
b293d758 2612 notify_update(vc);
1da177e4
LT		 2613
2614quit:
b0940003 2615 spin_unlock(&printing_lock);
1da177e4
LT		 2616}
2617
2618static struct tty_driver *vt_console_device(struct console *c, int *index)
2619{
2620 *index = c->index ? c->index-1 : fg_console;
2621 return console_driver;
2622}
2623
2624static struct console vt_console_driver = {
2625 .name = "tty",
2626 .write = vt_console_print,
2627 .device = vt_console_device,
2628 .unblank = unblank_screen,
2629 .flags = CON_PRINTBUFFER,
2630 .index = -1,
2631};
2632#endif
2633
2634/*
2635 * Handling of Linux-specific VC ioctls
2636 */
2637
2638/*
ac751efa 2639 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2640 *
2641 * There are some functions which don't need it.
2642 *
2643 * There are some functions which can sleep for arbitrary periods
2644 * (paste_selection) but we don't need the lock there anyway.
2645 *
2646 * set_selection has locking, and definitely needs it
2647 */
2648
2649int tioclinux(struct tty_struct *tty, unsigned long arg)
2650{
2651 char type, data;
2652 char __user *p = (char __user *)arg;
2653 int lines;
2654 int ret;
2655
1da177e4
LT		 2656 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2657 return -EPERM;
2658 if (get_user(type, p))
2659 return -EFAULT;
2660 ret = 0;
04f378b1 2661
1da177e4
LT		 2662 switch (type)
2663 {
2664 case TIOCL_SETSEL:
ac751efa 2665 console_lock();
1da177e4 2666 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2667 console_unlock();
1da177e4
LT		 2668 break;
2669 case TIOCL_PASTESEL:
2670 ret = paste_selection(tty);
2671 break;
2672 case TIOCL_UNBLANKSCREEN:
ac751efa 2673 console_lock();
1da177e4 2674 unblank_screen();
ac751efa 2675 console_unlock();
1da177e4
LT		 2676 break;
2677 case TIOCL_SELLOADLUT:
5289475d 2678 console_lock();
1da177e4 2679 ret = sel_loadlut(p);
5289475d 2680 console_unlock();
1da177e4
LT		 2681 break;
2682 case TIOCL_GETSHIFTSTATE:
04f378b1 2683
1da177e4
LT		 2684 /*
2685 * Make it possible to react to Shift+Mousebutton.
2686 * Note that 'shift_state' is an undocumented
2687 * kernel-internal variable; programs not closely
2688 * related to the kernel should not use this.
2689 */
079c9534 2690 data = vt_get_shift_state();
1da177e4
LT		 2691 ret = __put_user(data, p);
2692 break;
2693 case TIOCL_GETMOUSEREPORTING:
20f62579 2694 console_lock(); /* May be overkill */
1da177e4 2695 data = mouse_reporting();
20f62579 2696 console_unlock();
1da177e4
LT		 2697 ret = __put_user(data, p);
2698 break;
2699 case TIOCL_SETVESABLANK:
20f62579 2700 console_lock();
403aac96 2701 ret = set_vesa_blanking(p);
20f62579 2702 console_unlock();
1da177e4 2703 break;
0ca07731 2704 case TIOCL_GETKMSGREDIRECT:
5ada918b 2705 data = vt_get_kmsg_redirect();
0ca07731
RW		 2706 ret = __put_user(data, p);
2707 break;
1da177e4
LT		 2708 case TIOCL_SETKMSGREDIRECT:
2709 if (!capable(CAP_SYS_ADMIN)) {
2710 ret = -EPERM;
2711 } else {
2712 if (get_user(data, p+1))
2713 ret = -EFAULT;
2714 else
5ada918b 2715 vt_kmsg_redirect(data);
1da177e4
LT		 2716 }
2717 break;
2718 case TIOCL_GETFGCONSOLE:
20f62579
AC		 2719 /* No locking needed as this is a transiently
2720 correct return anyway if the caller hasn't
2721 disabled switching */
1da177e4
LT		 2722 ret = fg_console;
2723 break;
2724 case TIOCL_SCROLLCONSOLE:
2725 if (get_user(lines, (s32 __user *)(p+4))) {
2726 ret = -EFAULT;
2727 } else {
20f62579
AC		 2728 /* Need the console lock here. Note that lots
2729 of other calls need fixing before the lock
2730 is actually useful ! */
2731 console_lock();
1da177e4 2732 scrollfront(vc_cons[fg_console].d, lines);
20f62579 2733 console_unlock();
1da177e4
LT		 2734 ret = 0;
2735 }
2736 break;
2737 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2738 console_lock();
1da177e4
LT		 2739 ignore_poke = 1;
2740 do_blank_screen(0);
ac751efa 2741 console_unlock();
1da177e4
LT		 2742 break;
2743 case TIOCL_BLANKEDSCREEN:
2744 ret = console_blanked;
2745 break;
2746 default:
2747 ret = -EINVAL;
2748 break;
2749 }
2750 return ret;
2751}
2752
2753/*
2754 * /dev/ttyN handling
2755 */
2756
2757static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2758{
2759 int retval;
2760
2761 retval = do_con_write(tty, buf, count);
2762 con_flush_chars(tty);
2763
2764 return retval;
2765}
2766
5d19f546 2767static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2768{
2769 if (in_interrupt())
5d19f546
AC		 2770 return 0; /* n_r3964 calls put_char() from interrupt context */
2771 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2772}
2773
2774static int con_write_room(struct tty_struct *tty)
2775{
2776 if (tty->stopped)
2777 return 0;
a88a69c9 2778 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2779}
2780
2781static int con_chars_in_buffer(struct tty_struct *tty)
2782{
2783 return 0; /* we're not buffering */
2784}
2785
2786/*
2787 * con_throttle and con_unthrottle are only used for
2788 * paste_selection(), which has to stuff in a large number of
2789 * characters...
2790 */
2791static void con_throttle(struct tty_struct *tty)
2792{
2793}
2794
2795static void con_unthrottle(struct tty_struct *tty)
2796{
2797 struct vc_data *vc = tty->driver_data;
2798
2799 wake_up_interruptible(&vc->paste_wait);
2800}
2801
2802/*
2803 * Turn the Scroll-Lock LED on when the tty is stopped
2804 */
2805static void con_stop(struct tty_struct *tty)
2806{
2807 int console_num;
2808 if (!tty)
2809 return;
2810 console_num = tty->index;
2811 if (!vc_cons_allocated(console_num))
2812 return;
079c9534 2813 vt_kbd_con_stop(console_num);
1da177e4
LT		 2814}
2815
2816/*
2817 * Turn the Scroll-Lock LED off when the console is started
2818 */
2819static void con_start(struct tty_struct *tty)
2820{
2821 int console_num;
2822 if (!tty)
2823 return;
2824 console_num = tty->index;
2825 if (!vc_cons_allocated(console_num))
2826 return;
079c9534 2827 vt_kbd_con_start(console_num);
1da177e4
LT		 2828}
2829
2830static void con_flush_chars(struct tty_struct *tty)
2831{
2832 struct vc_data *vc;
2833
2834 if (in_interrupt()) /* from flush_to_ldisc */
2835 return;
2836
2837 /* if we race with con_close(), vt may be null */
ac751efa 2838 console_lock();
1da177e4
LT		 2839 vc = tty->driver_data;
2840 if (vc)
2841 set_cursor(vc);
ac751efa 2842 console_unlock();
1da177e4
LT		 2843}
2844
2845/*
2846 * Allocate the console screen memory.
2847 */
bc1e99d9 2848static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 2849{
2850 unsigned int currcons = tty->index;
bc1e99d9
JS		 2851 struct vc_data *vc;
2852 int ret;
1da177e4 2853
ac751efa 2854 console_lock();
bc1e99d9
JS		 2855 ret = vc_allocate(currcons);
2856 if (ret)
2857 goto unlock;
feebed65 2858
bc1e99d9 2859 vc = vc_cons[currcons].d;
1da177e4 2860
bc1e99d9
JS		 2861 /* Still being freed */
2862 if (vc->port.tty) {
2863 ret = -ERESTARTSYS;
2864 goto unlock;
2865 }
2866
2867 ret = tty_port_install(&vc->port, driver, tty);
2868 if (ret)
2869 goto unlock;
2870
2871 tty->driver_data = vc;
2872 vc->port.tty = tty;
2873
2874 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2875 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2876 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 2877 }
bc1e99d9 2878 if (vc->vc_utf)
adc8d746 2879 tty->termios.c_iflag |= IUTF8;
bc1e99d9 2880 else
adc8d746 2881 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 2882unlock:
ac751efa 2883 console_unlock();
1da177e4
LT		 2884 return ret;
2885}
2886
bc1e99d9
JS		 2887static int con_open(struct tty_struct *tty, struct file *filp)
2888{
2889 /* everything done in install */
2890 return 0;
2891}
2892
2893
1da177e4
LT		 2894static void con_close(struct tty_struct *tty, struct file *filp)
2895{
feebed65
AC		 2896 /* Nothing to do - we defer to shutdown */
2897}
1da177e4 2898
feebed65
AC		 2899static void con_shutdown(struct tty_struct *tty)
2900{
2901 struct vc_data *vc = tty->driver_data;
2902 BUG_ON(vc == NULL);
ac751efa 2903 console_lock();
8ce73264 2904 vc->port.tty = NULL;
ac751efa 2905 console_unlock();
1da177e4
LT		 2906}
2907
3855ae1c 2908static int default_color = 7; /* white */
fa6ce9ab
JE		 2909static int default_italic_color = 2; // green (ASCII)
2910static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 2911module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 2912module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2913module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2914
1da177e4
LT		 2915static void vc_init(struct vc_data *vc, unsigned int rows,
2916 unsigned int cols, int do_clear)
2917{
2918 int j, k ;
2919
2920 vc->vc_cols = cols;
2921 vc->vc_rows = rows;
2922 vc->vc_size_row = cols << 1;
2923 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2924
2925 set_origin(vc);
2926 vc->vc_pos = vc->vc_origin;
2927 reset_vc(vc);
2928 for (j=k=0; j<16; j++) {
2929 vc->vc_palette[k++] = default_red[j] ;
2930 vc->vc_palette[k++] = default_grn[j] ;
2931 vc->vc_palette[k++] = default_blu[j] ;
2932 }
3855ae1c 2933 vc->vc_def_color = default_color;
fa6ce9ab
JE		 2934 vc->vc_ulcolor = default_underline_color;
2935 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2936 vc->vc_halfcolor = 0x08; /* grey */
2937 init_waitqueue_head(&vc->paste_wait);
2938 reset_terminal(vc, do_clear);
2939}
2940
2941/*
2942 * This routine initializes console interrupts, and does nothing
2943 * else. If you want the screen to clear, call tty_write with
2944 * the appropriate escape-sequence.
2945 */
2946
2947static int __init con_init(void)
2948{
2949 const char *display_desc = NULL;
2950 struct vc_data *vc;
3e795de7 2951 unsigned int currcons = 0, i;
1da177e4 2952
ac751efa 2953 console_lock();
1da177e4
LT		 2954
2955 if (conswitchp)
2956 display_desc = conswitchp->con_startup();
2957 if (!display_desc) {
2958 fg_console = 0;
ac751efa 2959 console_unlock();
1da177e4
LT		 2960 return 0;
2961 }
2962
3e795de7
AD		 2963 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2964 struct con_driver *con_driver = &registered_con_driver[i];
2965
2966 if (con_driver->con == NULL) {
2967 con_driver->con = conswitchp;
2968 con_driver->desc = display_desc;
2969 con_driver->flag = CON_DRIVER_FLAG_INIT;
2970 con_driver->first = 0;
2971 con_driver->last = MAX_NR_CONSOLES - 1;
2972 break;
2973 }
2974 }
2975
2976 for (i = 0; i < MAX_NR_CONSOLES; i++)
2977 con_driver_map[i] = conswitchp;
2978
1da177e4
LT		 2979 if (blankinterval) {
2980 blank_state = blank_normal_wait;
f324edc8 2981 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2982 }
2983
1da177e4 2984 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2985 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2986 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 2987 tty_port_init(&vc->port);
1da177e4 2988 visual_init(vc, currcons, 1);
a5f4f52e 2989 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 2990 vc_init(vc, vc->vc_rows, vc->vc_cols,
2991 currcons || !vc->vc_sw->con_save_screen);
2992 }
2993 currcons = fg_console = 0;
2994 master_display_fg = vc = vc_cons[currcons].d;
2995 set_origin(vc);
2996 save_screen(vc);
2997 gotoxy(vc, vc->vc_x, vc->vc_y);
2998 csi_J(vc, 0);
2999 update_screen(vc);
5da527aa 3000 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3001 vc->vc_can_do_color ? "colour" : "mono",
3002 display_desc, vc->vc_cols, vc->vc_rows);
3003 printable = 1;
1da177e4 3004
ac751efa 3005 console_unlock();
1da177e4
LT		 3006
3007#ifdef CONFIG_VT_CONSOLE
3008 register_console(&vt_console_driver);
3009#endif
3010 return 0;
3011}
3012console_initcall(con_init);
3013
b68e31d0 3014static const struct tty_operations con_ops = {
bc1e99d9 3015 .install = con_install,
1da177e4
LT		 3016 .open = con_open,
3017 .close = con_close,
3018 .write = con_write,
3019 .write_room = con_write_room,
3020 .put_char = con_put_char,
3021 .flush_chars = con_flush_chars,
3022 .chars_in_buffer = con_chars_in_buffer,
3023 .ioctl = vt_ioctl,
e9216651
AB		 3024#ifdef CONFIG_COMPAT
3025 .compat_ioctl = vt_compat_ioctl,
3026#endif
1da177e4
LT		 3027 .stop = con_stop,
3028 .start = con_start,
3029 .throttle = con_throttle,
3030 .unthrottle = con_unthrottle,
8c9a9dd0 3031 .resize = vt_resize,
feebed65 3032 .shutdown = con_shutdown
1da177e4
LT		 3033};
3034
d81ed103
AC		 3035static struct cdev vc0_cdev;
3036
fbc92a34
KS		 3037static ssize_t show_tty_active(struct device *dev,
3038 struct device_attribute *attr, char *buf)
3039{
3040 return sprintf(buf, "tty%d\n", fg_console + 1);
3041}
3042static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3043
1083a7be
TI		 3044static struct attribute *vt_dev_attrs[] = {
3045 &dev_attr_active.attr,
3046 NULL
3047};
3048
3049ATTRIBUTE_GROUPS(vt_dev);
3050
d81ed103 3051int __init vty_init(const struct file_operations *console_fops)
1da177e4 3052{
d81ed103
AC		 3053 cdev_init(&vc0_cdev, console_fops);
3054 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3055 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3056 panic("Couldn't register /dev/tty0 driver\n");
1083a7be
TI		 3057 tty0dev = device_create_with_groups(tty_class, NULL,
3058 MKDEV(TTY_MAJOR, 0), NULL,
3059 vt_dev_groups, "tty0");
fbc92a34
KS		 3060 if (IS_ERR(tty0dev))
3061 tty0dev = NULL;
d81ed103 3062
1da177e4
LT		 3063 vcs_init();
3064
3065 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3066 if (!console_driver)
3067 panic("Couldn't allocate console driver\n");
2f16669d 3068
1da177e4
LT		 3069 console_driver->name = "tty";
3070 console_driver->name_base = 1;
3071 console_driver->major = TTY_MAJOR;
3072 console_driver->minor_start = 1;
3073 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3074 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3075 if (default_utf8)
3076 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3077 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3078 tty_set_operations(console_driver, &con_ops);
3079 if (tty_register_driver(console_driver))
3080 panic("Couldn't register console driver\n");
1da177e4
LT		 3081 kbd_init();
3082 console_map_init();
1da177e4
LT		 3083#ifdef CONFIG_MDA_CONSOLE
3084 mda_console_init();
3085#endif
3086 return 0;
3087}
3088
3089#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3090
3091static struct class *vtconsole_class;
3092
50e244cc 3093static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3094 int deflt)
1da177e4 3095{
3e795de7
AD		 3096 struct module *owner = csw->owner;
3097 const char *desc = NULL;
3098 struct con_driver *con_driver;
3099 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3100
1da177e4
LT		 3101 if (!try_module_get(owner))
3102 return -ENODEV;
3103
50e244cc 3104 WARN_CONSOLE_UNLOCKED();
1c8ce271 3105
3e795de7
AD		 3106 /* check if driver is registered */
3107 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3108 con_driver = &registered_con_driver[i];
3109
3110 if (con_driver->con == csw) {
3111 desc = con_driver->desc;
3112 retval = 0;
3113 break;
3114 }
3115 }
3116
3117 if (retval)
3118 goto err;
3119
3120 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3121 csw->con_startup();
3122 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3123 }
1c8ce271 3124
1da177e4
LT		 3125 if (deflt) {
3126 if (conswitchp)
3127 module_put(conswitchp->owner);
1c8ce271 3128
1da177e4
LT		 3129 __module_get(owner);
3130 conswitchp = csw;
3131 }
3132
3e795de7
AD		 3133 first = max(first, con_driver->first);
3134 last = min(last, con_driver->last);
3135
1da177e4
LT		 3136 for (i = first; i <= last; i++) {
3137 int old_was_color;
3138 struct vc_data *vc = vc_cons[i].d;
3139
3140 if (con_driver_map[i])
3141 module_put(con_driver_map[i]->owner);
3142 __module_get(owner);
3143 con_driver_map[i] = csw;
3144
3145 if (!vc || !vc->vc_sw)
3146 continue;
3147
3148 j = i;
1c8ce271 3149
4ee1acce
DH		 3150 if (CON_IS_VISIBLE(vc)) {
3151 k = i;
1da177e4 3152 save_screen(vc);
4ee1acce
DH		 3153 }
3154
1da177e4
LT		 3155 old_was_color = vc->vc_can_do_color;
3156 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3157 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3158 visual_init(vc, i, 0);
1c8ce271 3159 set_origin(vc);
1da177e4
LT		 3160 update_attr(vc);
3161
3162 /* If the console changed between mono <-> color, then
3163 * the attributes in the screenbuf will be wrong. The
3164 * following resets all attributes to something sane.
3165 */
3166 if (old_was_color != vc->vc_can_do_color)
3167 clear_buffer_attributes(vc);
1da177e4 3168 }
4ee1acce 3169
1ffdda95 3170 pr_info("Console: switching ");
1da177e4
LT		 3171 if (!deflt)
3172 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3173 if (j >= 0) {
3174 struct vc_data *vc = vc_cons[j].d;
3175
1da177e4 3176 printk("to %s %s %dx%d\n",
4ee1acce
DH		 3177 vc->vc_can_do_color ? "colour" : "mono",
3178 desc, vc->vc_cols, vc->vc_rows);
3179
3180 if (k >= 0) {
3181 vc = vc_cons[k].d;
3182 update_screen(vc);
3183 }
3184 } else
1da177e4
LT		 3185 printk("to %s\n", desc);
3186
3e795de7
AD		 3187 retval = 0;
3188err:
1da177e4 3189 module_put(owner);
3e795de7
AD		 3190 return retval;
3191};
1da177e4 3192
50e244cc 3193
13ae6645
AD		 3194#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3195static int con_is_graphics(const struct consw *csw, int first, int last)
3196{
3197 int i, retval = 0;
3198
3199 for (i = first; i <= last; i++) {
3200 struct vc_data *vc = vc_cons[i].d;
3201
3202 if (vc && vc->vc_mode == KD_GRAPHICS) {
3203 retval = 1;
3204 break;
3205 }
3206 }
3207
3208 return retval;
3209}
3210
e93a9a86
TI		 3211/* unlocked version of unbind_con_driver() */
3212int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3213{
3e795de7
AD		 3214 struct module *owner = csw->owner;
3215 const struct consw *defcsw = NULL;
3216 struct con_driver *con_driver = NULL, *con_back = NULL;
3217 int i, retval = -ENODEV;
1da177e4 3218
3e795de7
AD		 3219 if (!try_module_get(owner))
3220 return -ENODEV;
3221
e93a9a86 3222 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3223
3224 /* check if driver is registered and if it is unbindable */
3225 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3226 con_driver = &registered_con_driver[i];
3227
3228 if (con_driver->con == csw &&
6db4063c 3229 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3230 retval = 0;
3231 break;
3232 }
3233 }
3234
e93a9a86 3235 if (retval)
3e795de7 3236 goto err;
3e795de7 3237
6db4063c
AD		 3238 retval = -ENODEV;
3239
3e795de7
AD		 3240 /* check if backup driver exists */
3241 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3242 con_back = &registered_con_driver[i];
3243
249f7b3e 3244 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3245 defcsw = con_back->con;
3246 retval = 0;
3247 break;
3248 }
3249 }
3250
e93a9a86 3251 if (retval)
3e795de7 3252 goto err;
3e795de7 3253
e93a9a86 3254 if (!con_is_bound(csw))
3e795de7 3255 goto err;
3e795de7
AD		 3256
3257 first = max(first, con_driver->first);
3258 last = min(last, con_driver->last);
3259
3260 for (i = first; i <= last; i++) {
1da177e4
LT		 3261 if (con_driver_map[i] == csw) {
3262 module_put(csw->owner);
3263 con_driver_map[i] = NULL;
3264 }
3e795de7
AD		 3265 }
3266
3267 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3268 const struct consw *defconsw = conswitchp;
3269
3e795de7
AD		 3270 defcsw->con_startup();
3271 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3272 /*
3273 * vgacon may change the default driver to point
3274 * to dummycon, we restore it here...
3275 */
3276 conswitchp = defconsw;
3e795de7
AD		 3277 }
3278
3279 if (!con_is_bound(csw))
3280 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3281
6db4063c 3282 /* ignore return value, binding should not fail */
50e244cc 3283 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3284err:
3285 module_put(owner);
3286 return retval;
3287
3288}
e93a9a86 3289EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3290
6db4063c
AD		 3291static int vt_bind(struct con_driver *con)
3292{
3293 const struct consw *defcsw = NULL, *csw = NULL;
3294 int i, more = 1, first = -1, last = -1, deflt = 0;
3295
3296 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3297 con_is_graphics(con->con, con->first, con->last))
3298 goto err;
3299
3300 csw = con->con;
3301
3302 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3303 struct con_driver *con = &registered_con_driver[i];
3304
3305 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3306 defcsw = con->con;
3307 break;
3308 }
3309 }
3310
3311 if (!defcsw)
3312 goto err;
3313
3314 while (more) {
3315 more = 0;
3316
3317 for (i = con->first; i <= con->last; i++) {
3318 if (con_driver_map[i] == defcsw) {
3319 if (first == -1)
3320 first = i;
3321 last = i;
3322 more = 1;
3323 } else if (first != -1)
3324 break;
3325 }
3326
3327 if (first == 0 && last == MAX_NR_CONSOLES -1)
3328 deflt = 1;
3329
4c215fe8 3330 if (first != -1)
c62a1e57 3331 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3332
3333 first = -1;
3334 last = -1;
3335 deflt = 0;
3336 }
3337
3338err:
3339 return 0;
3340}
3341
3342static int vt_unbind(struct con_driver *con)
3343{
3344 const struct consw *csw = NULL;
3345 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3346 int ret;
6db4063c
AD		 3347
3348 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3349 con_is_graphics(con->con, con->first, con->last))
3350 goto err;
3351
3352 csw = con->con;
3353
3354 while (more) {
3355 more = 0;
3356
3357 for (i = con->first; i <= con->last; i++) {
3358 if (con_driver_map[i] == csw) {
3359 if (first == -1)
3360 first = i;
3361 last = i;
3362 more = 1;
3363 } else if (first != -1)
3364 break;
3365 }
3366
3367 if (first == 0 && last == MAX_NR_CONSOLES -1)
3368 deflt = 1;
3369
618f2b90 3370 if (first != -1) {
f418f2ec 3371 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3372 if (ret != 0)
3373 return ret;
618f2b90 3374 }
6db4063c
AD		 3375
3376 first = -1;
3377 last = -1;
3378 deflt = 0;
3379 }
3380
3381err:
3382 return 0;
3383}
13ae6645
AD		 3384#else
3385static inline int vt_bind(struct con_driver *con)
3386{
3387 return 0;
3388}
3389static inline int vt_unbind(struct con_driver *con)
3390{
3391 return 0;
3392}
3393#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3394
805952a8 3395static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3396 const char *buf, size_t count)
3397{
805952a8 3398 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3399 int bind = simple_strtoul(buf, NULL, 0);
3400
4c215fe8
ID		 3401 console_lock();
3402
6db4063c
AD		 3403 if (bind)
3404 vt_bind(con);
3405 else
3406 vt_unbind(con);
3407
4c215fe8
ID		 3408 console_unlock();
3409
6db4063c
AD		 3410 return count;
3411}
3412
805952a8
GKH		 3413static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3414 char *buf)
6db4063c 3415{
805952a8 3416 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3417 int bind = con_is_bound(con->con);
3418
3419 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3420}
3421
805952a8
GKH		 3422static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3423 char *buf)
6db4063c 3424{
805952a8 3425 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3426
3427 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3428 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3429 con->desc);
3430
3431}
3432
1083a7be
TI		 3433static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3434static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3435
3436static struct attribute *con_dev_attrs[] = {
3437 &dev_attr_bind.attr,
3438 &dev_attr_name.attr,
3439 NULL
6db4063c
AD		 3440};
3441
1083a7be
TI		 3442ATTRIBUTE_GROUPS(con_dev);
3443
805952a8 3444static int vtconsole_init_device(struct con_driver *con)
6db4063c 3445{
928e964f 3446 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3447 return 0;
6db4063c
AD		 3448}
3449
805952a8 3450static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3451{
1083a7be 3452 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3453}
3454
3e795de7
AD		 3455/**
3456 * con_is_bound - checks if driver is bound to the console
3457 * @csw: console driver
3458 *
3459 * RETURNS: zero if unbound, nonzero if bound
3460 *
3461 * Drivers can call this and if zero, they should release
3462 * all resources allocated on con_startup()
3463 */
3464int con_is_bound(const struct consw *csw)
3465{
3466 int i, bound = 0;
3467
3468 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3469 if (con_driver_map[i] == csw) {
3470 bound = 1;
3471 break;
3472 }
3473 }
3474
3475 return bound;
3476}
3477EXPORT_SYMBOL(con_is_bound);
3478
b45cfba4
JB		 3479/**
3480 * con_debug_enter - prepare the console for the kernel debugger
3481 * @sw: console driver
3482 *
3483 * Called when the console is taken over by the kernel debugger, this
3484 * function needs to save the current console state, then put the console
3485 * into a state suitable for the kernel debugger.
3486 *
3487 * RETURNS:
3488 * Zero on success, nonzero if a failure occurred when trying to prepare
3489 * the console for the debugger.
3490 */
3491int con_debug_enter(struct vc_data *vc)
3492{
3493 int ret = 0;
3494
3495 saved_fg_console = fg_console;
3496 saved_last_console = last_console;
3497 saved_want_console = want_console;
3498 saved_vc_mode = vc->vc_mode;
beed5336 3499 saved_console_blanked = console_blanked;
b45cfba4
JB		 3500 vc->vc_mode = KD_TEXT;
3501 console_blanked = 0;
3502 if (vc->vc_sw->con_debug_enter)
3503 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3504#ifdef CONFIG_KGDB_KDB
3505 /* Set the initial LINES variable if it is not already set */
3506 if (vc->vc_rows < 999) {
3507 int linecount;
3508 char lns[4];
3509 const char *setargs[3] = {
3510 "set",
3511 "LINES",
3512 lns,
3513 };
3514 if (kdbgetintenv(setargs[0], &linecount)) {
3515 snprintf(lns, 4, "%i", vc->vc_rows);
3516 kdb_set(2, setargs);
3517 }
3518 }
17b572e8
JW		 3519 if (vc->vc_cols < 999) {
3520 int colcount;
3521 char cols[4];
3522 const char *setargs[3] = {
3523 "set",
3524 "COLUMNS",
3525 cols,
3526 };
3527 if (kdbgetintenv(setargs[0], &colcount)) {
3528 snprintf(cols, 4, "%i", vc->vc_cols);
3529 kdb_set(2, setargs);
3530 }
3531 }
81d44507 3532#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3533 return ret;
3534}
3535EXPORT_SYMBOL_GPL(con_debug_enter);
3536
3537/**
3538 * con_debug_leave - restore console state
3539 * @sw: console driver
3540 *
3541 * Restore the console state to what it was before the kernel debugger
3542 * was invoked.
3543 *
3544 * RETURNS:
3545 * Zero on success, nonzero if a failure occurred when trying to restore
3546 * the console.
3547 */
3548int con_debug_leave(void)
3549{
3550 struct vc_data *vc;
3551 int ret = 0;
3552
3553 fg_console = saved_fg_console;
3554 last_console = saved_last_console;
3555 want_console = saved_want_console;
beed5336 3556 console_blanked = saved_console_blanked;
b45cfba4
JB		 3557 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3558
3559 vc = vc_cons[fg_console].d;
3560 if (vc->vc_sw->con_debug_leave)
3561 ret = vc->vc_sw->con_debug_leave(vc);
3562 return ret;
3563}
3564EXPORT_SYMBOL_GPL(con_debug_leave);
3565
50e244cc 3566static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 3567{
3568 struct module *owner = csw->owner;
3569 struct con_driver *con_driver;
3570 const char *desc;
3571 int i, retval = 0;
3572
50e244cc
AC		 3573 WARN_CONSOLE_UNLOCKED();
3574
3e795de7
AD		 3575 if (!try_module_get(owner))
3576 return -ENODEV;
3577
3e795de7
AD		 3578 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3579 con_driver = &registered_con_driver[i];
3580
3581 /* already registered */
3582 if (con_driver->con == csw)
c55c63c6 3583 retval = -EBUSY;
3e795de7
AD		 3584 }
3585
3586 if (retval)
3587 goto err;
3588
3589 desc = csw->con_startup();
3590
3591 if (!desc)
3592 goto err;
3593
3594 retval = -EINVAL;
3595
3596 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3597 con_driver = &registered_con_driver[i];
3598
3599 if (con_driver->con == NULL) {
3600 con_driver->con = csw;
3601 con_driver->desc = desc;
6db4063c
AD		 3602 con_driver->node = i;
3603 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3604 CON_DRIVER_FLAG_INIT;
3605 con_driver->first = first;
3606 con_driver->last = last;
3607 retval = 0;
3608 break;
3609 }
3610 }
3611
6db4063c
AD		 3612 if (retval)
3613 goto err;
3614
1083a7be
TI		 3615 con_driver->dev =
3616 device_create_with_groups(vtconsole_class, NULL,
3617 MKDEV(0, con_driver->node),
3618 con_driver, con_dev_groups,
3619 "vtcon%i", con_driver->node);
805952a8
GKH		 3620 if (IS_ERR(con_driver->dev)) {
3621 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3622 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3623 PTR_ERR(con_driver->dev));
3624 con_driver->dev = NULL;
6db4063c 3625 } else {
805952a8 3626 vtconsole_init_device(con_driver);
6db4063c 3627 }
928e964f 3628
3e795de7 3629err:
3e795de7
AD		 3630 module_put(owner);
3631 return retval;
3632}
50e244cc 3633
3e795de7
AD		 3634
3635/**
50539dd4 3636 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 3637 * @csw: console driver
3638 *
3639 * DESCRIPTION: All drivers that registers to the console layer must
3640 * call this function upon exit, or if the console driver is in a state
3641 * where it won't be able to handle console services, such as the
3642 * framebuffer console without loaded framebuffer drivers.
3643 *
3644 * The driver must unbind first prior to unregistration.
3645 */
e93a9a86
TI		 3646int do_unregister_con_driver(const struct consw *csw)
3647{
d9c660e7 3648 int i;
3e795de7
AD		 3649
3650 /* cannot unregister a bound driver */
3651 if (con_is_bound(csw))
d9c660e7
DV		 3652 return -EBUSY;
3653
3654 if (csw == conswitchp)
3655 return -EINVAL;
3e795de7
AD		 3656
3657 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3658 struct con_driver *con_driver = &registered_con_driver[i];
3659
2cf30f75 3660 if (con_driver->con == csw) {
805952a8
GKH		 3661 vtconsole_deinit_device(con_driver);
3662 device_destroy(vtconsole_class,
3663 MKDEV(0, con_driver->node));
3e795de7
AD		 3664 con_driver->con = NULL;
3665 con_driver->desc = NULL;
805952a8 3666 con_driver->dev = NULL;
6db4063c 3667 con_driver->node = 0;
3e795de7
AD		 3668 con_driver->flag = 0;
3669 con_driver->first = 0;
3670 con_driver->last = 0;
d9c660e7 3671 return 0;
3e795de7
AD		 3672 }
3673 }
d9c660e7
DV		 3674
3675 return -ENODEV;
3e795de7 3676}
e93a9a86 3677EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7
AD		 3678
3679/*
3680 * If we support more console drivers, this function is used
3681 * when a driver wants to take over some existing consoles
3682 * and become default driver for newly opened ones.
3683 *
155957f5 3684 * do_take_over_console is basically a register followed by unbind
50e244cc
AC		 3685 */
3686int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3687{
3688 int err;
3689
3690 err = do_register_con_driver(csw, first, last);
3691 /*
3692 * If we get an busy error we still want to bind the console driver
3693 * and return success, as we may have unbound the console driver
3694 * but not unregistered it.
3695 */
3696 if (err == -EBUSY)
3697 err = 0;
3698 if (!err)
3699 do_bind_con_driver(csw, first, last, deflt);
3700
3701 return err;
3702}
3703EXPORT_SYMBOL_GPL(do_take_over_console);
3704
3e795de7
AD		 3705
3706/*
3707 * give_up_console is a wrapper to unregister_con_driver. It will only
3708 * work if driver is fully unbound.
3709 */
3710void give_up_console(const struct consw *csw)
3711{
70125e76
WY		 3712 console_lock();
3713 do_unregister_con_driver(csw);
3714 console_unlock();
3e795de7
AD		 3715}
3716
6db4063c 3717static int __init vtconsole_class_init(void)
3e795de7 3718{
6db4063c 3719 int i;
3e795de7 3720
6db4063c
AD		 3721 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3722 if (IS_ERR(vtconsole_class)) {
3723 printk(KERN_WARNING "Unable to create vt console class; "
3724 "errno = %ld\n", PTR_ERR(vtconsole_class));
3725 vtconsole_class = NULL;
3726 }
3e795de7 3727
6db4063c 3728 /* Add system drivers to sysfs */
3e795de7
AD		 3729 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3730 struct con_driver *con = &registered_con_driver[i];
3731
805952a8 3732 if (con->con && !con->dev) {
1083a7be
TI		 3733 con->dev =
3734 device_create_with_groups(vtconsole_class, NULL,
3735 MKDEV(0, con->node),
3736 con, con_dev_groups,
3737 "vtcon%i", con->node);
6db4063c 3738
805952a8 3739 if (IS_ERR(con->dev)) {
6db4063c 3740 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3741 "device for %s; errno = %ld\n",
3742 con->desc, PTR_ERR(con->dev));
3743 con->dev = NULL;
6db4063c 3744 } else {
805952a8 3745 vtconsole_init_device(con);
6db4063c 3746 }
3e795de7 3747 }
3e795de7
AD		 3748 }
3749
3e795de7
AD		 3750 return 0;
3751}
6db4063c 3752postcore_initcall(vtconsole_class_init);
3e795de7 3753
1da177e4
LT		 3754#endif
3755
3756/*
3757 * Screen blanking
3758 */
3759
403aac96 3760static int set_vesa_blanking(char __user *p)
1da177e4 3761{
403aac96
YY		 3762 unsigned int mode;
3763
3764 if (get_user(mode, p + 1))
3765 return -EFAULT;
3766
3767 vesa_blank_mode = (mode < 4) ? mode : 0;
3768 return 0;
1da177e4
LT		 3769}
3770
1da177e4
LT		 3771void do_blank_screen(int entering_gfx)
3772{
3773 struct vc_data *vc = vc_cons[fg_console].d;
3774 int i;
3775
3776 WARN_CONSOLE_UNLOCKED();
3777
3778 if (console_blanked) {
3779 if (blank_state == blank_vesa_wait) {
3780 blank_state = blank_off;
d060a321 3781 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3782 }
3783 return;
3784 }
1da177e4
LT		 3785
3786 /* entering graphics mode? */
3787 if (entering_gfx) {
3788 hide_cursor(vc);
3789 save_screen(vc);
3790 vc->vc_sw->con_blank(vc, -1, 1);
3791 console_blanked = fg_console + 1;
b6e8f00f 3792 blank_state = blank_off;
1da177e4
LT		 3793 set_origin(vc);
3794 return;
3795 }
3796
b6e8f00f 3797 if (blank_state != blank_normal_wait)
3798 return;
3799 blank_state = blank_off;
3800
1da177e4
LT		 3801 /* don't blank graphics */
3802 if (vc->vc_mode != KD_TEXT) {
3803 console_blanked = fg_console + 1;
3804 return;
3805 }
3806
3807 hide_cursor(vc);
3808 del_timer_sync(&console_timer);
3809 blank_timer_expired = 0;
3810
3811 save_screen(vc);
3812 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3813 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3814 console_blanked = fg_console + 1;
3815 if (i)
3816 set_origin(vc);
3817
3818 if (console_blank_hook && console_blank_hook(1))
3819 return;
3820
d060a321 3821 if (vesa_off_interval && vesa_blank_mode) {
030babac 3822 blank_state = blank_vesa_wait;
1da177e4
LT		 3823 mod_timer(&console_timer, jiffies + vesa_off_interval);
3824 }
8b92e87d 3825 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3826}
3827EXPORT_SYMBOL(do_blank_screen);
3828
3829/*
3830 * Called by timer as well as from vt_console_driver
3831 */
3832void do_unblank_screen(int leaving_gfx)
3833{
3834 struct vc_data *vc;
3835
3836 /* This should now always be called from a "sane" (read: can schedule)
3837 * context for the sake of the low level drivers, except in the special
3838 * case of oops_in_progress
3839 */
3840 if (!oops_in_progress)
3841 might_sleep();
3842
3843 WARN_CONSOLE_UNLOCKED();
3844
3845 ignore_poke = 0;
3846 if (!console_blanked)
3847 return;
3848 if (!vc_cons_allocated(fg_console)) {
3849 /* impossible */
e620e548
JP		 3850 pr_warn("unblank_screen: tty %d not allocated ??\n",
3851 fg_console + 1);
1da177e4
LT		 3852 return;
3853 }
3854 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3855 /* Try to unblank in oops case too */
3856 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3857 return; /* but leave console_blanked != 0 */
3858
3859 if (blankinterval) {
f324edc8 3860 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3861 blank_state = blank_normal_wait;
3862 }
3863
3864 console_blanked = 0;
8fd4bd22 3865 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3866 /* Low-level driver cannot restore -> do it ourselves */
3867 update_screen(vc);
3868 if (console_blank_hook)
3869 console_blank_hook(0);
3870 set_palette(vc);
3871 set_cursor(vc);
8b92e87d 3872 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3873}
3874EXPORT_SYMBOL(do_unblank_screen);
3875
3876/*
3877 * This is called by the outside world to cause a forced unblank, mostly for
3878 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3879 * call it with 1 as an argument and so force a mode restore... that may kill
3880 * X or at least garbage the screen but would also make the Oops visible...
3881 */
3882void unblank_screen(void)
3883{
3884 do_unblank_screen(0);
3885}
3886
3887/*
70522e12 3888 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3889 * (console operations can still happen at irq time, but only from printk which
70522e12 3890 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3891 */
3892static void blank_screen_t(unsigned long dummy)
3893{
cc63b1e1 3894 if (unlikely(!keventd_up())) {
f324edc8 3895 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3896 return;
3897 }
1da177e4
LT		 3898 blank_timer_expired = 1;
3899 schedule_work(&console_work);
3900}
3901
3902void poke_blanked_console(void)
3903{
3904 WARN_CONSOLE_UNLOCKED();
3905
3906 /* Add this so we quickly catch whoever might call us in a non
3907 * safe context. Nowadays, unblank_screen() isn't to be called in
3908 * atomic contexts and is allowed to schedule (with the special case
3909 * of oops_in_progress, but that isn't of any concern for this
3910 * function. --BenH.
3911 */
3912 might_sleep();
3913
3914 /* This isn't perfectly race free, but a race here would be mostly harmless,
3915 * at worse, we'll do a spurrious blank and it's unlikely
3916 */
3917 del_timer(&console_timer);
3918 blank_timer_expired = 0;
3919
3920 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3921 return;
3922 if (console_blanked)
3923 unblank_screen();
3924 else if (blankinterval) {
f324edc8 3925 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3926 blank_state = blank_normal_wait;
3927 }
3928}
3929
3930/*
3931 * Palettes
3932 */
3933
3934static void set_palette(struct vc_data *vc)
3935{
3936 WARN_CONSOLE_UNLOCKED();
3937
3938 if (vc->vc_mode != KD_GRAPHICS)
3939 vc->vc_sw->con_set_palette(vc, color_table);
3940}
3941
1da177e4
LT		 3942/*
3943 * Load palette into the DAC registers. arg points to a colour
3944 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3945 */
3946
3947int con_set_cmap(unsigned char __user *arg)
3948{
871bdea6
MG		 3949 int i, j, k;
3950 unsigned char colormap[3*16];
3951
3952 if (copy_from_user(colormap, arg, sizeof(colormap)))
3953 return -EFAULT;
1da177e4 3954
ac751efa 3955 console_lock();
871bdea6
MG		 3956 for (i = k = 0; i < 16; i++) {
3957 default_red[i] = colormap[k++];
3958 default_grn[i] = colormap[k++];
3959 default_blu[i] = colormap[k++];
3960 }
3961 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3962 if (!vc_cons_allocated(i))
3963 continue;
3964 for (j = k = 0; j < 16; j++) {
3965 vc_cons[i].d->vc_palette[k++] = default_red[j];
3966 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3967 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3968 }
3969 set_palette(vc_cons[i].d);
3970 }
ac751efa 3971 console_unlock();
1da177e4 3972
871bdea6 3973 return 0;
1da177e4
LT		 3974}
3975
3976int con_get_cmap(unsigned char __user *arg)
3977{
871bdea6
MG		 3978 int i, k;
3979 unsigned char colormap[3*16];
1da177e4 3980
ac751efa 3981 console_lock();
871bdea6
MG		 3982 for (i = k = 0; i < 16; i++) {
3983 colormap[k++] = default_red[i];
3984 colormap[k++] = default_grn[i];
3985 colormap[k++] = default_blu[i];
3986 }
ac751efa 3987 console_unlock();
1da177e4 3988
871bdea6
MG		 3989 if (copy_to_user(arg, colormap, sizeof(colormap)))
3990 return -EFAULT;
3991
3992 return 0;
1da177e4
LT		 3993}
3994
3995void reset_palette(struct vc_data *vc)
3996{
3997 int j, k;
3998 for (j=k=0; j<16; j++) {
3999 vc->vc_palette[k++] = default_red[j];
4000 vc->vc_palette[k++] = default_grn[j];
4001 vc->vc_palette[k++] = default_blu[j];
4002 }
4003 set_palette(vc);
4004}
4005
4006/*
4007 * Font switching
4008 *
4009 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4010 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4011 * depending on width) reserved for each character which is kinda wasty, but
4012 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4013 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4014 * format (maybe we should add a `fontoffset' field to the `display'
4015 * structure so we won't have to convert the fontdata all the time.
4016 * /Jes
4017 */
4018
4019#define max_font_size 65536
4020
4021static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4022{
4023 struct console_font font;
4024 int rc = -EINVAL;
4025 int c;
4026
1da177e4
LT		 4027 if (op->data) {
4028 font.data = kmalloc(max_font_size, GFP_KERNEL);
4029 if (!font.data)
4030 return -ENOMEM;
4031 } else
4032 font.data = NULL;
4033
ac751efa 4034 console_lock();
edab558f
AC		 4035 if (vc->vc_mode != KD_TEXT)
4036 rc = -EINVAL;
4037 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4038 rc = vc->vc_sw->con_font_get(vc, &font);
4039 else
4040 rc = -ENOSYS;
ac751efa 4041 console_unlock();
1da177e4
LT		 4042
4043 if (rc)
4044 goto out;
4045
4046 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4047
1da177e4
LT		 4048 if (op->data && font.charcount > op->charcount)
4049 rc = -ENOSPC;
4050 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4051 if (font.width > op->width || font.height > op->height)
4052 rc = -ENOSPC;
4053 } else {
4054 if (font.width != 8)
4055 rc = -EIO;
4056 else if ((op->height && font.height > op->height) ||
4057 font.height > 32)
4058 rc = -ENOSPC;
4059 }
4060 if (rc)
4061 goto out;
4062
4063 op->height = font.height;
4064 op->width = font.width;
4065 op->charcount = font.charcount;
4066
4067 if (op->data && copy_to_user(op->data, font.data, c))
4068 rc = -EFAULT;
4069
4070out:
4071 kfree(font.data);
4072 return rc;
4073}
4074
4075static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4076{
4077 struct console_font font;
4078 int rc = -EINVAL;
4079 int size;
4080
4081 if (vc->vc_mode != KD_TEXT)
4082 return -EINVAL;
4083 if (!op->data)
4084 return -EINVAL;
4085 if (op->charcount > 512)
4086 return -EINVAL;
4087 if (!op->height) { /* Need to guess font height [compat] */
4088 int h, i;
4089 u8 __user *charmap = op->data;
4090 u8 tmp;
4091
4092 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4093 so that we can get rid of this soon */
4094 if (!(op->flags & KD_FONT_FLAG_OLD))
4095 return -EINVAL;
4096 for (h = 32; h > 0; h--)
4097 for (i = 0; i < op->charcount; i++) {
4098 if (get_user(tmp, &charmap[32*i+h-1]))
4099 return -EFAULT;
4100 if (tmp)
4101 goto nonzero;
4102 }
4103 return -EINVAL;
4104 nonzero:
4105 op->height = h;
4106 }
4107 if (op->width <= 0 || op->width > 32 || op->height > 32)
4108 return -EINVAL;
4109 size = (op->width+7)/8 * 32 * op->charcount;
4110 if (size > max_font_size)
4111 return -ENOSPC;
4112 font.charcount = op->charcount;
4113 font.height = op->height;
4114 font.width = op->width;
9b71ca20
JL		 4115 font.data = memdup_user(op->data, size);
4116 if (IS_ERR(font.data))
4117 return PTR_ERR(font.data);
ac751efa 4118 console_lock();
edab558f
AC		 4119 if (vc->vc_mode != KD_TEXT)
4120 rc = -EINVAL;
4121 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4122 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4123 else
4124 rc = -ENOSYS;
ac751efa 4125 console_unlock();
1da177e4
LT		 4126 kfree(font.data);
4127 return rc;
4128}
4129
4130static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4131{
4132 struct console_font font = {.width = op->width, .height = op->height};
4133 char name[MAX_FONT_NAME];
4134 char *s = name;
4135 int rc;
4136
1da177e4
LT		 4137
4138 if (!op->data)
4139 s = NULL;
4140 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4141 return -EFAULT;
4142 else
4143 name[MAX_FONT_NAME - 1] = 0;
4144
ac751efa 4145 console_lock();
edab558f
AC		 4146 if (vc->vc_mode != KD_TEXT) {
4147 console_unlock();
4148 return -EINVAL;
4149 }
1da177e4
LT		 4150 if (vc->vc_sw->con_font_default)
4151 rc = vc->vc_sw->con_font_default(vc, &font, s);
4152 else
4153 rc = -ENOSYS;
ac751efa 4154 console_unlock();
1da177e4
LT		 4155 if (!rc) {
4156 op->width = font.width;
4157 op->height = font.height;
4158 }
4159 return rc;
4160}
4161
4162static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4163{
4164 int con = op->height;
4165 int rc;
4166
1da177e4 4167
ac751efa 4168 console_lock();
edab558f
AC		 4169 if (vc->vc_mode != KD_TEXT)
4170 rc = -EINVAL;
4171 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4172 rc = -ENOSYS;
4173 else if (con < 0 || !vc_cons_allocated(con))
4174 rc = -ENOTTY;
4175 else if (con == vc->vc_num) /* nothing to do */
4176 rc = 0;
4177 else
4178 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4179 console_unlock();
1da177e4
LT		 4180 return rc;
4181}
4182
4183int con_font_op(struct vc_data *vc, struct console_font_op *op)
4184{
4185 switch (op->op) {
4186 case KD_FONT_OP_SET:
4187 return con_font_set(vc, op);
4188 case KD_FONT_OP_GET:
4189 return con_font_get(vc, op);
4190 case KD_FONT_OP_SET_DEFAULT:
4191 return con_font_default(vc, op);
4192 case KD_FONT_OP_COPY:
4193 return con_font_copy(vc, op);
4194 }
4195 return -ENOSYS;
4196}
4197
4198/*
4199 * Interface exported to selection and vcs.
4200 */
4201
4202/* used by selection */
4203u16 screen_glyph(struct vc_data *vc, int offset)
4204{
4205 u16 w = scr_readw(screenpos(vc, offset, 1));
4206 u16 c = w & 0xff;
4207
4208 if (w & vc->vc_hi_font_mask)
4209 c |= 0x100;
4210 return c;
4211}
f7511d5f 4212EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4213
4214/* used by vcs - note the word offset */
4215unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4216{
4217 return screenpos(vc, 2 * w_offset, viewed);
4218}
4219
4220void getconsxy(struct vc_data *vc, unsigned char *p)
4221{
4222 p[0] = vc->vc_x;
4223 p[1] = vc->vc_y;
4224}
4225
4226void putconsxy(struct vc_data *vc, unsigned char *p)
4227{
9477e260 4228 hide_cursor(vc);
1da177e4
LT		 4229 gotoxy(vc, p[0], p[1]);
4230 set_cursor(vc);
4231}
4232
4233u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4234{
4235 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4236 return softcursor_original;
4237 return scr_readw(org);
4238}
4239
4240void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4241{
4242 scr_writew(val, org);
4243 if ((unsigned long)org == vc->vc_pos) {
4244 softcursor_original = -1;
4245 add_softcursor(vc);
4246 }
4247}
4248
432c9ed2
NP		 4249void vcs_scr_updated(struct vc_data *vc)
4250{
4251 notify_update(vc);
4252}
4253
1da177e4
LT		 4254/*
4255 * Visible symbols for modules
4256 */
4257
4258EXPORT_SYMBOL(color_table);
4259EXPORT_SYMBOL(default_red);
4260EXPORT_SYMBOL(default_grn);
4261EXPORT_SYMBOL(default_blu);
4262EXPORT_SYMBOL(update_region);
4263EXPORT_SYMBOL(redraw_screen);
4264EXPORT_SYMBOL(vc_resize);
4265EXPORT_SYMBOL(fg_console);
4266EXPORT_SYMBOL(console_blank_hook);
4267EXPORT_SYMBOL(console_blanked);
4268EXPORT_SYMBOL(vc_cons);
f6c06b68 4269EXPORT_SYMBOL(global_cursor_default);
1da177e4 4270#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4271EXPORT_SYMBOL(give_up_console);
4272#endif
Linux 6.x block layer and io_uring tree(s)