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serial: jsm: Fix unnecessary space before function ptr arguments
[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);
503}
504
505/* used by selection: complement pointer position */
506void complement_pos(struct vc_data *vc, int offset)
507{
414edcd3 508 static int old_offset = -1;
1da177e4
LT		 509 static unsigned short old;
510 static unsigned short oldx, oldy;
511
512 WARN_CONSOLE_UNLOCKED();
513
414edcd3
AD		 514 if (old_offset != -1 && old_offset >= 0 &&
515 old_offset < vc->vc_screenbuf_size) {
516 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 517 if (DO_UPDATE(vc))
518 vc->vc_sw->con_putc(vc, old, oldy, oldx);
519 }
414edcd3
AD		 520
521 old_offset = offset;
522
523 if (offset != -1 && offset >= 0 &&
524 offset < vc->vc_screenbuf_size) {
1da177e4 525 unsigned short new;
414edcd3 526 unsigned short *p;
1da177e4
LT		 527 p = screenpos(vc, offset, 1);
528 old = scr_readw(p);
529 new = old ^ vc->vc_complement_mask;
530 scr_writew(new, p);
531 if (DO_UPDATE(vc)) {
532 oldx = (offset >> 1) % vc->vc_cols;
533 oldy = (offset >> 1) / vc->vc_cols;
534 vc->vc_sw->con_putc(vc, new, oldy, oldx);
535 }
536 }
414edcd3 537
1da177e4
LT		 538}
539
540static void insert_char(struct vc_data *vc, unsigned int nr)
541{
81732c3b 542 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 543
a883b70d 544 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b 545 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
1da177e4 546 vc->vc_need_wrap = 0;
81732c3b
JFM		 547 if (DO_UPDATE(vc))
548 do_update_region(vc, (unsigned long) p,
b1a925f4 549 vc->vc_cols - vc->vc_x);
1da177e4
LT		 550}
551
552static void delete_char(struct vc_data *vc, unsigned int nr)
553{
81732c3b 554 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 555
b1a925f4 556 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b
JFM		 557 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
558 nr * 2);
1da177e4 559 vc->vc_need_wrap = 0;
81732c3b
JFM		 560 if (DO_UPDATE(vc))
561 do_update_region(vc, (unsigned long) p,
b1a925f4 562 vc->vc_cols - vc->vc_x);
1da177e4
LT		 563}
564
565static int softcursor_original;
566
567static void add_softcursor(struct vc_data *vc)
568{
569 int i = scr_readw((u16 *) vc->vc_pos);
570 u32 type = vc->vc_cursor_type;
571
572 if (! (type & 0x10)) return;
573 if (softcursor_original != -1) return;
574 softcursor_original = i;
575 i |= ((type >> 8) & 0xff00 );
576 i ^= ((type) & 0xff00 );
577 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
578 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
579 scr_writew(i, (u16 *) vc->vc_pos);
580 if (DO_UPDATE(vc))
581 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
582}
583
584static void hide_softcursor(struct vc_data *vc)
585{
586 if (softcursor_original != -1) {
587 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
588 if (DO_UPDATE(vc))
589 vc->vc_sw->con_putc(vc, softcursor_original,
590 vc->vc_y, vc->vc_x);
591 softcursor_original = -1;
592 }
593}
594
595static void hide_cursor(struct vc_data *vc)
596{
597 if (vc == sel_cons)
598 clear_selection();
599 vc->vc_sw->con_cursor(vc, CM_ERASE);
600 hide_softcursor(vc);
601}
602
603static void set_cursor(struct vc_data *vc)
604{
605 if (!IS_FG(vc) || console_blanked ||
606 vc->vc_mode == KD_GRAPHICS)
607 return;
608 if (vc->vc_deccm) {
609 if (vc == sel_cons)
610 clear_selection();
611 add_softcursor(vc);
612 if ((vc->vc_cursor_type & 0x0f) != 1)
613 vc->vc_sw->con_cursor(vc, CM_DRAW);
614 } else
615 hide_cursor(vc);
616}
617
618static void set_origin(struct vc_data *vc)
619{
620 WARN_CONSOLE_UNLOCKED();
621
622 if (!CON_IS_VISIBLE(vc) ||
623 !vc->vc_sw->con_set_origin ||
624 !vc->vc_sw->con_set_origin(vc))
625 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
626 vc->vc_visible_origin = vc->vc_origin;
627 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
628 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
629}
630
631static inline void save_screen(struct vc_data *vc)
632{
633 WARN_CONSOLE_UNLOCKED();
634
635 if (vc->vc_sw->con_save_screen)
636 vc->vc_sw->con_save_screen(vc);
637}
638
639/*
640 * Redrawing of screen
641 */
642
2a248307 643void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 644{
645 unsigned short *p = (unsigned short *)vc->vc_origin;
646 int count = vc->vc_screenbuf_size / 2;
647 int mask = vc->vc_hi_font_mask | 0xff;
648
649 for (; count > 0; count--, p++) {
650 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
651 }
652}
653
654void redraw_screen(struct vc_data *vc, int is_switch)
655{
656 int redraw = 0;
657
658 WARN_CONSOLE_UNLOCKED();
659
660 if (!vc) {
661 /* strange ... */
662 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
663 return;
664 }
665
666 if (is_switch) {
667 struct vc_data *old_vc = vc_cons[fg_console].d;
668 if (old_vc == vc)
669 return;
670 if (!CON_IS_VISIBLE(vc))
671 redraw = 1;
672 *vc->vc_display_fg = vc;
673 fg_console = vc->vc_num;
674 hide_cursor(old_vc);
675 if (!CON_IS_VISIBLE(old_vc)) {
676 save_screen(old_vc);
677 set_origin(old_vc);
678 }
fbc92a34
KS		 679 if (tty0dev)
680 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 681 } else {
682 hide_cursor(vc);
683 redraw = 1;
684 }
685
686 if (redraw) {
687 int update;
688 int old_was_color = vc->vc_can_do_color;
689
690 set_origin(vc);
691 update = vc->vc_sw->con_switch(vc);
692 set_palette(vc);
693 /*
694 * If console changed from mono<->color, the best we can do
695 * is to clear the buffer attributes. As it currently stands,
696 * rebuilding new attributes from the old buffer is not doable
697 * without overly complex code.
698 */
699 if (old_was_color != vc->vc_can_do_color) {
700 update_attr(vc);
701 clear_buffer_attributes(vc);
702 }
8fd4bd22
JB		 703
704 /* Forcibly update if we're panicing */
705 if ((update && vc->vc_mode != KD_GRAPHICS) ||
706 vt_force_oops_output(vc))
1da177e4
LT		 707 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
708 }
709 set_cursor(vc);
710 if (is_switch) {
711 set_leds();
712 compute_shiftstate();
8182ec49 713 notify_update(vc);
1da177e4
LT		 714 }
715}
716
717/*
718 * Allocation, freeing and resizing of VTs.
719 */
720
721int vc_cons_allocated(unsigned int i)
722{
723 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
724}
725
726static void visual_init(struct vc_data *vc, int num, int init)
727{
728 /* ++Geert: vc->vc_sw->con_init determines console size */
729 if (vc->vc_sw)
730 module_put(vc->vc_sw->owner);
731 vc->vc_sw = conswitchp;
732#ifndef VT_SINGLE_DRIVER
733 if (con_driver_map[num])
734 vc->vc_sw = con_driver_map[num];
735#endif
736 __module_get(vc->vc_sw->owner);
737 vc->vc_num = num;
738 vc->vc_display_fg = &master_display_fg;
739 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
e4bdab70 740 vc->vc_uni_pagedir = NULL;
1da177e4
LT		 741 vc->vc_hi_font_mask = 0;
742 vc->vc_complement_mask = 0;
743 vc->vc_can_do_color = 0;
8fd4bd22 744 vc->vc_panic_force_write = false;
1da177e4
LT		 745 vc->vc_sw->con_init(vc, init);
746 if (!vc->vc_complement_mask)
747 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
748 vc->vc_s_complement_mask = vc->vc_complement_mask;
749 vc->vc_size_row = vc->vc_cols << 1;
750 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
751}
752
753int vc_allocate(unsigned int currcons) /* return 0 on success */
754{
755 WARN_CONSOLE_UNLOCKED();
756
757 if (currcons >= MAX_NR_CONSOLES)
758 return -ENXIO;
759 if (!vc_cons[currcons].d) {
760 struct vc_data *vc;
b293d758 761 struct vt_notifier_param param;
1da177e4
LT		 762
763 /* prevent users from taking too much memory */
764 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
765 return -EPERM;
766
767 /* due to the granularity of kmalloc, we waste some memory here */
768 /* the alloc is done in two steps, to optimize the common situation
769 of a 25x80 console (structsize=216, screenbuf_size=4000) */
770 /* although the numbers above are not valid since long ago, the
771 point is still up-to-date and the comment still has its value
772 even if only as a historical artifact. --mj, July 1998 */
b293d758 773 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1da177e4
LT		 774 if (!vc)
775 return -ENOMEM;
1da177e4 776 vc_cons[currcons].d = vc;
ff917ba4 777 tty_port_init(&vc->port);
c2c88f10 778 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 779 visual_init(vc, currcons, 1);
780 if (!*vc->vc_uni_pagedir_loc)
781 con_set_default_unimap(vc);
5c9228f0 782 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1da177e4
LT		 783 if (!vc->vc_screenbuf) {
784 kfree(vc);
785 vc_cons[currcons].d = NULL;
786 return -ENOMEM;
787 }
f6c06b68
MG		 788
789 /* If no drivers have overridden us and the user didn't pass a
790 boot option, default to displaying the cursor */
791 if (global_cursor_default == -1)
792 global_cursor_default = 1;
793
1da177e4 794 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
4995f8ef 795 vcs_make_sysfs(currcons);
b293d758 796 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1da177e4
LT		 797 }
798 return 0;
799}
800
e400b6ec
AD		 801static inline int resize_screen(struct vc_data *vc, int width, int height,
802 int user)
1da177e4
LT		 803{
804 /* Resizes the resolution of the display adapater */
805 int err = 0;
806
807 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 808 err = vc->vc_sw->con_resize(vc, width, height, user);
809
1da177e4
LT		 810 return err;
811}
812
813/*
814 * Change # of rows and columns (0 means unchanged/the size of fg_console)
815 * [this is to be used together with some user program
816 * like resize that changes the hardware videomode]
817 */
818#define VC_RESIZE_MAXCOL (32767)
819#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 820
821/**
822 * vc_do_resize - resizing method for the tty
823 * @tty: tty being resized
824 * @real_tty: real tty (different to tty if a pty/tty pair)
825 * @vc: virtual console private data
826 * @cols: columns
827 * @lines: lines
828 *
829 * Resize a virtual console, clipping according to the actual constraints.
830 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 831 * information and perform any necessary signal handling.
8c9a9dd0 832 *
6a1c0680 833 * Caller must hold the console semaphore. Takes the termios rwsem and
8c9a9dd0
AC		 834 * ctrl_lock of the tty IFF a tty is passed.
835 */
836
fc6f6238
AC		 837static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
838 unsigned int cols, unsigned int lines)
1da177e4
LT		 839{
840 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 841 unsigned long end;
f2ee4ae8 842 unsigned int old_rows, old_row_size;
1da177e4 843 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 844 unsigned int user;
1da177e4
LT		 845 unsigned short *newscreen;
846
847 WARN_CONSOLE_UNLOCKED();
848
849 if (!vc)
850 return -ENXIO;
851
e400b6ec
AD		 852 user = vc->vc_resize_user;
853 vc->vc_resize_user = 0;
854
1da177e4
LT		 855 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
856 return -EINVAL;
857
858 new_cols = (cols ? cols : vc->vc_cols);
859 new_rows = (lines ? lines : vc->vc_rows);
860 new_row_size = new_cols << 1;
861 new_screen_size = new_row_size * new_rows;
862
863 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
864 return 0;
865
5cbded58 866 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 867 if (!newscreen)
868 return -ENOMEM;
869
870 old_rows = vc->vc_rows;
1da177e4 871 old_row_size = vc->vc_size_row;
1da177e4 872
e400b6ec 873 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 874 if (err) {
875 kfree(newscreen);
876 return err;
877 }
878
879 vc->vc_rows = new_rows;
880 vc->vc_cols = new_cols;
881 vc->vc_size_row = new_row_size;
882 vc->vc_screenbuf_size = new_screen_size;
883
884 rlth = min(old_row_size, new_row_size);
885 rrem = new_row_size - rlth;
886 old_origin = vc->vc_origin;
887 new_origin = (long) newscreen;
888 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 889
890 if (vc->vc_y > new_rows) {
891 if (old_rows - vc->vc_y < new_rows) {
892 /*
893 * Cursor near the bottom, copy contents from the
894 * bottom of buffer
895 */
896 old_origin += (old_rows - new_rows) * old_row_size;
3b41dc1a
AD		 897 } else {
898 /*
899 * Cursor is in no man's land, copy 1/2 screenful
900 * from the top and bottom of cursor position
901 */
902 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
3b41dc1a 903 }
9fc2b2d0
FJ		 904 }
905
906 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4
LT		 907
908 update_attr(vc);
909
3b41dc1a
AD		 910 while (old_origin < end) {
911 scr_memcpyw((unsigned short *) new_origin,
912 (unsigned short *) old_origin, rlth);
1da177e4 913 if (rrem)
3b41dc1a
AD		 914 scr_memsetw((void *)(new_origin + rlth),
915 vc->vc_video_erase_char, rrem);
1da177e4
LT		 916 old_origin += old_row_size;
917 new_origin += new_row_size;
918 }
919 if (new_scr_end > new_origin)
3b41dc1a
AD		 920 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
921 new_scr_end - new_origin);
5c9228f0 922 kfree(vc->vc_screenbuf);
1da177e4 923 vc->vc_screenbuf = newscreen;
1da177e4
LT		 924 vc->vc_screenbuf_size = new_screen_size;
925 set_origin(vc);
926
927 /* do part of a reset_terminal() */
928 vc->vc_top = 0;
929 vc->vc_bottom = vc->vc_rows;
930 gotoxy(vc, vc->vc_x, vc->vc_y);
931 save_cur(vc);
932
8c9a9dd0
AC		 933 if (tty) {
934 /* Rewrite the requested winsize data with the actual
935 resulting sizes */
936 struct winsize ws;
1da177e4
LT		 937 memset(&ws, 0, sizeof(ws));
938 ws.ws_row = vc->vc_rows;
939 ws.ws_col = vc->vc_cols;
940 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 941 tty_do_resize(tty, &ws);
1da177e4
LT		 942 }
943
944 if (CON_IS_VISIBLE(vc))
945 update_screen(vc);
8b92e87d 946 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 947 return err;
948}
949
8c9a9dd0
AC		 950/**
951 * vc_resize - resize a VT
952 * @vc: virtual console
953 * @cols: columns
954 * @rows: rows
955 *
956 * Resize a virtual console as seen from the console end of things. We
957 * use the common vc_do_resize methods to update the structures. The
958 * caller must hold the console sem to protect console internals and
8ce73264 959 * vc->port.tty
8c9a9dd0
AC		 960 */
961
962int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
963{
8ce73264 964 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 965}
966
967/**
968 * vt_resize - resize a VT
969 * @tty: tty to resize
8c9a9dd0
AC		 970 * @ws: winsize attributes
971 *
972 * Resize a virtual terminal. This is called by the tty layer as we
973 * register our own handler for resizing. The mutual helper does all
974 * the actual work.
975 *
976 * Takes the console sem and the called methods then take the tty
6a1c0680 977 * termios_rwsem and the tty ctrl_lock in that order.
8c9a9dd0 978 */
da2bdf9a 979static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 980{
8c9a9dd0
AC		 981 struct vc_data *vc = tty->driver_data;
982 int ret;
ca9bda00 983
ac751efa 984 console_lock();
fc6f6238 985 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 986 console_unlock();
8c9a9dd0 987 return ret;
ca9bda00 988}
1da177e4 989
421b40a6 990struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 991{
421b40a6
PH		 992 struct vc_data *vc = NULL;
993
1da177e4
LT		 994 WARN_CONSOLE_UNLOCKED();
995
996 if (vc_cons_allocated(currcons)) {
421b40a6 997 struct vt_notifier_param param;
4995f8ef 998
421b40a6 999 param.vc = vc = vc_cons[currcons].d;
b293d758 1000 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1001 vcs_remove_sysfs(currcons);
1da177e4 1002 vc->vc_sw->con_deinit(vc);
bde0d2c9 1003 put_pid(vc->vt_pid);
d459ec0b 1004 module_put(vc->vc_sw->owner);
5c9228f0 1005 kfree(vc->vc_screenbuf);
1da177e4
LT		 1006 vc_cons[currcons].d = NULL;
1007 }
421b40a6 1008 return vc;
1da177e4
LT		 1009}
1010
1011/*
1012 * VT102 emulator
1013 */
1014
079c9534
AC		 1015#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1016#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1017#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1018
1019#define decarm VC_REPEAT
1020#define decckm VC_CKMODE
1021#define kbdapplic VC_APPLIC
1022#define lnm VC_CRLF
1023
1024/*
1025 * this is what the terminal answers to a ESC-Z or csi0c query.
1026 */
1027#define VT100ID "\033[?1;2c"
1028#define VT102ID "\033[?6c"
1029
1030unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1031 8,12,10,14, 9,13,11,15 };
1032
1033/* the default colour table, for VGA+ colour systems */
1034int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1035 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1036int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1037 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1038int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1039 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1040
1c2bbe6a
JE		 1041module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1042module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1043module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1044
1da177e4
LT		 1045/*
1046 * gotoxy() must verify all boundaries, because the arguments
1047 * might also be negative. If the given position is out of
1048 * bounds, the cursor is placed at the nearest margin.
1049 */
1050static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1051{
1052 int min_y, max_y;
1053
1054 if (new_x < 0)
1055 vc->vc_x = 0;
1056 else {
1057 if (new_x >= vc->vc_cols)
1058 vc->vc_x = vc->vc_cols - 1;
1059 else
1060 vc->vc_x = new_x;
1061 }
1062
1063 if (vc->vc_decom) {
1064 min_y = vc->vc_top;
1065 max_y = vc->vc_bottom;
1066 } else {
1067 min_y = 0;
1068 max_y = vc->vc_rows;
1069 }
1070 if (new_y < min_y)
1071 vc->vc_y = min_y;
1072 else if (new_y >= max_y)
1073 vc->vc_y = max_y - 1;
1074 else
1075 vc->vc_y = new_y;
1076 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1077 vc->vc_need_wrap = 0;
1078}
1079
1080/* for absolute user moves, when decom is set */
1081static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1082{
1083 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1084}
1085
1086void scrollback(struct vc_data *vc, int lines)
1087{
1088 if (!lines)
1089 lines = vc->vc_rows / 2;
1090 scrolldelta(-lines);
1091}
1092
1093void scrollfront(struct vc_data *vc, int lines)
1094{
1095 if (!lines)
1096 lines = vc->vc_rows / 2;
1097 scrolldelta(lines);
1098}
1099
1100static void lf(struct vc_data *vc)
1101{
1102 /* don't scroll if above bottom of scrolling region, or
1103 * if below scrolling region
1104 */
1105 if (vc->vc_y + 1 == vc->vc_bottom)
1106 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1107 else if (vc->vc_y < vc->vc_rows - 1) {
1108 vc->vc_y++;
1109 vc->vc_pos += vc->vc_size_row;
1110 }
1111 vc->vc_need_wrap = 0;
b293d758 1112 notify_write(vc, '\n');
1da177e4
LT		 1113}
1114
1115static void ri(struct vc_data *vc)
1116{
1117 /* don't scroll if below top of scrolling region, or
1118 * if above scrolling region
1119 */
1120 if (vc->vc_y == vc->vc_top)
1121 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1122 else if (vc->vc_y > 0) {
1123 vc->vc_y--;
1124 vc->vc_pos -= vc->vc_size_row;
1125 }
1126 vc->vc_need_wrap = 0;
1127}
1128
1129static inline void cr(struct vc_data *vc)
1130{
1131 vc->vc_pos -= vc->vc_x << 1;
1132 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1133 notify_write(vc, '\r');
1da177e4
LT		 1134}
1135
1136static inline void bs(struct vc_data *vc)
1137{
1138 if (vc->vc_x) {
1139 vc->vc_pos -= 2;
1140 vc->vc_x--;
1141 vc->vc_need_wrap = 0;
b293d758 1142 notify_write(vc, '\b');
1da177e4
LT		 1143 }
1144}
1145
1146static inline void del(struct vc_data *vc)
1147{
1148 /* ignored */
1149}
1150
1151static void csi_J(struct vc_data *vc, int vpar)
1152{
1153 unsigned int count;
1154 unsigned short * start;
1155
1156 switch (vpar) {
1157 case 0: /* erase from cursor to end of display */
1158 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1159 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1160 break;
1161 case 1: /* erase from start to cursor */
1162 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1163 start = (unsigned short *)vc->vc_origin;
1da177e4 1164 break;
f8df13e0
PP		 1165 case 3: /* erase scroll-back buffer (and whole display) */
1166 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1167 vc->vc_screenbuf_size >> 1);
1168 set_origin(vc);
0930b095
PP		 1169 if (CON_IS_VISIBLE(vc))
1170 update_screen(vc);
f8df13e0 1171 /* fall through */
1da177e4
LT		 1172 case 2: /* erase whole display */
1173 count = vc->vc_cols * vc->vc_rows;
1174 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1175 break;
1176 default:
1177 return;
1178 }
1179 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
81732c3b
JFM		 1180 if (DO_UPDATE(vc))
1181 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1182 vc->vc_need_wrap = 0;
1183}
1184
1185static void csi_K(struct vc_data *vc, int vpar)
1186{
1187 unsigned int count;
1188 unsigned short * start;
1189
1190 switch (vpar) {
1191 case 0: /* erase from cursor to end of line */
1192 count = vc->vc_cols - vc->vc_x;
1193 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1194 break;
1195 case 1: /* erase from start of line to cursor */
1196 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1197 count = vc->vc_x + 1;
1da177e4
LT		 1198 break;
1199 case 2: /* erase whole line */
1200 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1201 count = vc->vc_cols;
1da177e4
LT		 1202 break;
1203 default:
1204 return;
1205 }
1206 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1207 vc->vc_need_wrap = 0;
81732c3b
JFM		 1208 if (DO_UPDATE(vc))
1209 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1210}
1211
1212static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1213{ /* not vt100? */
1214 int count;
1215
1216 if (!vpar)
1217 vpar++;
1218 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1219
1220 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1221 if (DO_UPDATE(vc))
1222 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1223 vc->vc_need_wrap = 0;
1224}
1225
1226static void default_attr(struct vc_data *vc)
1227{
1228 vc->vc_intensity = 1;
fa6ce9ab 1229 vc->vc_italic = 0;
1da177e4
LT		 1230 vc->vc_underline = 0;
1231 vc->vc_reverse = 0;
1232 vc->vc_blink = 0;
1233 vc->vc_color = vc->vc_def_color;
1234}
1235
cec5b2a9
AB		 1236struct rgb { u8 r; u8 g; u8 b; };
1237
1238struct rgb rgb_from_256(int i)
1239{
1240 struct rgb c;
1241 if (i < 8) { /* Standard colours. */
1242 c.r = i&1 ? 0xaa : 0x00;
1243 c.g = i&2 ? 0xaa : 0x00;
1244 c.b = i&4 ? 0xaa : 0x00;
1245 } else if (i < 16) {
1246 c.r = i&1 ? 0xff : 0x55;
1247 c.g = i&2 ? 0xff : 0x55;
1248 c.b = i&4 ? 0xff : 0x55;
1249 } else if (i < 232) { /* 6x6x6 colour cube. */
1250 c.r = (i - 16) / 36 * 85 / 2;
1251 c.g = (i - 16) / 6 % 6 * 85 / 2;
1252 c.b = (i - 16) % 6 * 85 / 2;
1253 } else /* Grayscale ramp. */
1254 c.r = c.g = c.b = i * 10 - 2312;
1255 return c;
1256}
1257
1258static void rgb_foreground(struct vc_data *vc, struct rgb c)
1259{
1260 u8 hue, max = c.r;
1261 if (c.g > max)
1262 max = c.g;
1263 if (c.b > max)
1264 max = c.b;
1265 hue = (c.r > max/2 ? 4 : 0)
1266 | (c.g > max/2 ? 2 : 0)
1267 | (c.b > max/2 ? 1 : 0);
1268 if (hue == 7 && max <= 0x55)
1269 hue = 0, vc->vc_intensity = 2;
1270 else
1271 vc->vc_intensity = (max > 0xaa) + 1;
1272 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1273}
1274
1275static void rgb_background(struct vc_data *vc, struct rgb c)
1276{
1277 /* For backgrounds, err on the dark side. */
1278 vc->vc_color = (vc->vc_color & 0x0f)
1279 | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1280}
1281
ac751efa 1282/* console_lock is held */
1da177e4
LT		 1283static void csi_m(struct vc_data *vc)
1284{
1285 int i;
1286
1287 for (i = 0; i <= vc->vc_npar; i++)
1288 switch (vc->vc_par[i]) {
1289 case 0: /* all attributes off */
1290 default_attr(vc);
1291 break;
1292 case 1:
1293 vc->vc_intensity = 2;
1294 break;
1295 case 2:
1296 vc->vc_intensity = 0;
1297 break;
fa6ce9ab
JE		 1298 case 3:
1299 vc->vc_italic = 1;
1300 break;
1da177e4
LT		 1301 case 4:
1302 vc->vc_underline = 1;
1303 break;
1304 case 5:
1305 vc->vc_blink = 1;
1306 break;
1307 case 7:
1308 vc->vc_reverse = 1;
1309 break;
1310 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1311 * Select primary font, don't display
1312 * control chars if defined, don't set
1313 * bit 8 on output.
1314 */
1315 vc->vc_translate = set_translate(vc->vc_charset == 0
1316 ? vc->vc_G0_charset
1317 : vc->vc_G1_charset, vc);
1318 vc->vc_disp_ctrl = 0;
1319 vc->vc_toggle_meta = 0;
1320 break;
1321 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1322 * Select first alternate font, lets
1323 * chars < 32 be displayed as ROM chars.
1324 */
1325 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1326 vc->vc_disp_ctrl = 1;
1327 vc->vc_toggle_meta = 0;
1328 break;
1329 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1330 * Select second alternate font, toggle
1331 * high bit before displaying as ROM char.
1332 */
1333 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1334 vc->vc_disp_ctrl = 1;
1335 vc->vc_toggle_meta = 1;
1336 break;
1337 case 21:
1338 case 22:
1339 vc->vc_intensity = 1;
1340 break;
fa6ce9ab
JE		 1341 case 23:
1342 vc->vc_italic = 0;
1343 break;
1da177e4
LT		 1344 case 24:
1345 vc->vc_underline = 0;
1346 break;
1347 case 25:
1348 vc->vc_blink = 0;
1349 break;
1350 case 27:
1351 vc->vc_reverse = 0;
1352 break;
cec5b2a9 1353 case 38: /* ITU T.416
3415097f
AB		 1354 * Higher colour modes.
1355 * They break the usual properties of SGR codes
1356 * and thus need to be detected and ignored by
1357 * hand. Strictly speaking, that standard also
1358 * wants : rather than ; as separators, contrary
1359 * to ECMA-48, but no one produces such codes
1360 * and almost no one accepts them.
1361 */
1362 i++;
1363 if (i > vc->vc_npar)
1364 break;
cec5b2a9
AB		 1365 if (vc->vc_par[i] == 5 && /* 256 colours */
1366 i < vc->vc_npar) { /* ubiquitous */
1367 i++;
1368 rgb_foreground(vc,
1369 rgb_from_256(vc->vc_par[i]));
1370 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1371 i <= vc->vc_npar + 3) {/* extremely rare */
085f4d84
PF		 1372 struct rgb c = {
1373 .r = vc->vc_par[i + 1],
1374 .g = vc->vc_par[i + 2],
1375 .b = vc->vc_par[i + 3],
1376 };
cec5b2a9
AB		 1377 rgb_foreground(vc, c);
1378 i += 3;
1379 }
3415097f 1380 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
cec5b2a9 1381 * there's no point in supporting them.
3415097f
AB		 1382 */
1383 break;
cec5b2a9
AB		 1384 case 48:
1385 i++;
1386 if (i > vc->vc_npar)
1387 break;
1388 if (vc->vc_par[i] == 5 && /* 256 colours */
1389 i < vc->vc_npar) {
1390 i++;
1391 rgb_background(vc,
1392 rgb_from_256(vc->vc_par[i]));
1393 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1394 i <= vc->vc_npar + 3) {
085f4d84
PF		 1395 struct rgb c = {
1396 .r = vc->vc_par[i + 1],
1397 .g = vc->vc_par[i + 2],
1398 .b = vc->vc_par[i + 3],
1399 };
cec5b2a9
AB		 1400 rgb_background(vc, c);
1401 i += 3;
1402 }
1403 break;
64545880 1404 case 39:
1da177e4 1405 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1da177e4
LT		 1406 break;
1407 case 49:
1408 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1409 break;
1410 default:
1411 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1412 vc->vc_color = color_table[vc->vc_par[i] - 30]
1413 | (vc->vc_color & 0xf0);
1414 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1415 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1416 | (vc->vc_color & 0x0f);
1417 break;
1418 }
1419 update_attr(vc);
1420}
1421
6732c8bb 1422static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1423{
1424 while (*p) {
6732c8bb 1425 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1426 p++;
1427 }
6732c8bb 1428 tty_schedule_flip(port);
1da177e4
LT		 1429}
1430
1431static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1432{
1433 char buf[40];
1434
1435 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1436 respond_string(buf, tty->port);
1da177e4
LT		 1437}
1438
1439static inline void status_report(struct tty_struct *tty)
1440{
6732c8bb 1441 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1442}
1443
6732c8bb 1444static inline void respond_ID(struct tty_struct *tty)
1da177e4 1445{
6732c8bb 1446 respond_string(VT102ID, tty->port);
1da177e4
LT		 1447}
1448
1449void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1450{
1451 char buf[8];
1452
1453 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1454 (char)('!' + mry));
6732c8bb 1455 respond_string(buf, tty->port);
1da177e4
LT		 1456}
1457
1458/* invoked via ioctl(TIOCLINUX) and through set_selection */
1459int mouse_reporting(void)
1460{
1461 return vc_cons[fg_console].d->vc_report_mouse;
1462}
1463
ac751efa 1464/* console_lock is held */
1da177e4
LT		 1465static void set_mode(struct vc_data *vc, int on_off)
1466{
1467 int i;
1468
1469 for (i = 0; i <= vc->vc_npar; i++)
1470 if (vc->vc_ques) {
1471 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1472 case 1: /* Cursor keys send ^[Ox/^[[x */
1473 if (on_off)
1474 set_kbd(vc, decckm);
1475 else
1476 clr_kbd(vc, decckm);
1477 break;
1478 case 3: /* 80/132 mode switch unimplemented */
1479 vc->vc_deccolm = on_off;
1480#if 0
1481 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1482 /* this alone does not suffice; some user mode
1483 utility has to change the hardware regs */
1484#endif
1485 break;
1486 case 5: /* Inverted screen on/off */
1487 if (vc->vc_decscnm != on_off) {
1488 vc->vc_decscnm = on_off;
1489 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1490 update_attr(vc);
1491 }
1492 break;
1493 case 6: /* Origin relative/absolute */
1494 vc->vc_decom = on_off;
1495 gotoxay(vc, 0, 0);
1496 break;
1497 case 7: /* Autowrap on/off */
1498 vc->vc_decawm = on_off;
1499 break;
1500 case 8: /* Autorepeat on/off */
1501 if (on_off)
1502 set_kbd(vc, decarm);
1503 else
1504 clr_kbd(vc, decarm);
1505 break;
1506 case 9:
1507 vc->vc_report_mouse = on_off ? 1 : 0;
1508 break;
1509 case 25: /* Cursor on/off */
1510 vc->vc_deccm = on_off;
1511 break;
1512 case 1000:
1513 vc->vc_report_mouse = on_off ? 2 : 0;
1514 break;
1515 }
1516 } else {
1517 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1518 case 3: /* Monitor (display ctrls) */
1519 vc->vc_disp_ctrl = on_off;
1520 break;
1521 case 4: /* Insert Mode on/off */
1522 vc->vc_decim = on_off;
1523 break;
1524 case 20: /* Lf, Enter == CrLf/Lf */
1525 if (on_off)
1526 set_kbd(vc, lnm);
1527 else
1528 clr_kbd(vc, lnm);
1529 break;
1530 }
1531 }
1532}
1533
ac751efa 1534/* console_lock is held */
1da177e4
LT		 1535static void setterm_command(struct vc_data *vc)
1536{
1537 switch(vc->vc_par[0]) {
1538 case 1: /* set color for underline mode */
1539 if (vc->vc_can_do_color &&
1540 vc->vc_par[1] < 16) {
1541 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1542 if (vc->vc_underline)
1543 update_attr(vc);
1544 }
1545 break;
1546 case 2: /* set color for half intensity mode */
1547 if (vc->vc_can_do_color &&
1548 vc->vc_par[1] < 16) {
1549 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1550 if (vc->vc_intensity == 0)
1551 update_attr(vc);
1552 }
1553 break;
1554 case 8: /* store colors as defaults */
1555 vc->vc_def_color = vc->vc_attr;
1556 if (vc->vc_hi_font_mask == 0x100)
1557 vc->vc_def_color >>= 1;
1558 default_attr(vc);
1559 update_attr(vc);
1560 break;
1561 case 9: /* set blanking interval */
f324edc8 1562 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1563 poke_blanked_console();
1564 break;
1565 case 10: /* set bell frequency in Hz */
1566 if (vc->vc_npar >= 1)
1567 vc->vc_bell_pitch = vc->vc_par[1];
1568 else
1569 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1570 break;
1571 case 11: /* set bell duration in msec */
1572 if (vc->vc_npar >= 1)
1573 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1574 vc->vc_par[1] * HZ / 1000 : 0;
1575 else
1576 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1577 break;
1578 case 12: /* bring specified console to the front */
1579 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1580 set_console(vc->vc_par[1] - 1);
1581 break;
1582 case 13: /* unblank the screen */
1583 poke_blanked_console();
1584 break;
1585 case 14: /* set vesa powerdown interval */
1586 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1587 break;
1588 case 15: /* activate the previous console */
1589 set_console(last_console);
1590 break;
1591 }
1592}
1593
ac751efa 1594/* console_lock is held */
1da177e4
LT		 1595static void csi_at(struct vc_data *vc, unsigned int nr)
1596{
1597 if (nr > vc->vc_cols - vc->vc_x)
1598 nr = vc->vc_cols - vc->vc_x;
1599 else if (!nr)
1600 nr = 1;
1601 insert_char(vc, nr);
1602}
1603
ac751efa 1604/* console_lock is held */
1da177e4
LT		 1605static void csi_L(struct vc_data *vc, unsigned int nr)
1606{
1607 if (nr > vc->vc_rows - vc->vc_y)
1608 nr = vc->vc_rows - vc->vc_y;
1609 else if (!nr)
1610 nr = 1;
1611 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1612 vc->vc_need_wrap = 0;
1613}
1614
ac751efa 1615/* console_lock is held */
1da177e4
LT		 1616static void csi_P(struct vc_data *vc, unsigned int nr)
1617{
1618 if (nr > vc->vc_cols - vc->vc_x)
1619 nr = vc->vc_cols - vc->vc_x;
1620 else if (!nr)
1621 nr = 1;
1622 delete_char(vc, nr);
1623}
1624
ac751efa 1625/* console_lock is held */
1da177e4
LT		 1626static void csi_M(struct vc_data *vc, unsigned int nr)
1627{
1628 if (nr > vc->vc_rows - vc->vc_y)
1629 nr = vc->vc_rows - vc->vc_y;
1630 else if (!nr)
1631 nr=1;
1632 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1633 vc->vc_need_wrap = 0;
1634}
1635
ac751efa 1636/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1637static void save_cur(struct vc_data *vc)
1638{
1639 vc->vc_saved_x = vc->vc_x;
1640 vc->vc_saved_y = vc->vc_y;
1641 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1642 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1643 vc->vc_s_underline = vc->vc_underline;
1644 vc->vc_s_blink = vc->vc_blink;
1645 vc->vc_s_reverse = vc->vc_reverse;
1646 vc->vc_s_charset = vc->vc_charset;
1647 vc->vc_s_color = vc->vc_color;
1648 vc->vc_saved_G0 = vc->vc_G0_charset;
1649 vc->vc_saved_G1 = vc->vc_G1_charset;
1650}
1651
ac751efa 1652/* console_lock is held */
1da177e4
LT		 1653static void restore_cur(struct vc_data *vc)
1654{
1655 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1656 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1657 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1658 vc->vc_underline = vc->vc_s_underline;
1659 vc->vc_blink = vc->vc_s_blink;
1660 vc->vc_reverse = vc->vc_s_reverse;
1661 vc->vc_charset = vc->vc_s_charset;
1662 vc->vc_color = vc->vc_s_color;
1663 vc->vc_G0_charset = vc->vc_saved_G0;
1664 vc->vc_G1_charset = vc->vc_saved_G1;
1665 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1666 update_attr(vc);
1667 vc->vc_need_wrap = 0;
1668}
1669
b290af68 1670enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1da177e4 1671 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
63f3a16d 1672 ESpalette, ESosc };
1da177e4 1673
ac751efa 1674/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1675static void reset_terminal(struct vc_data *vc, int do_clear)
1676{
1677 vc->vc_top = 0;
1678 vc->vc_bottom = vc->vc_rows;
1679 vc->vc_state = ESnormal;
1680 vc->vc_ques = 0;
1681 vc->vc_translate = set_translate(LAT1_MAP, vc);
1682 vc->vc_G0_charset = LAT1_MAP;
1683 vc->vc_G1_charset = GRAF_MAP;
1684 vc->vc_charset = 0;
1685 vc->vc_need_wrap = 0;
1686 vc->vc_report_mouse = 0;
042f10ec 1687 vc->vc_utf = default_utf8;
1da177e4
LT		 1688 vc->vc_utf_count = 0;
1689
1690 vc->vc_disp_ctrl = 0;
1691 vc->vc_toggle_meta = 0;
1692
1693 vc->vc_decscnm = 0;
1694 vc->vc_decom = 0;
1695 vc->vc_decawm = 1;
f6c06b68 1696 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1697 vc->vc_decim = 0;
1698
079c9534 1699 vt_reset_keyboard(vc->vc_num);
1da177e4 1700
9ea9a886 1701 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1702 vc->vc_complement_mask = vc->vc_s_complement_mask;
1703
1704 default_attr(vc);
1705 update_attr(vc);
1706
1707 vc->vc_tab_stop[0] = 0x01010100;
1708 vc->vc_tab_stop[1] =
1709 vc->vc_tab_stop[2] =
1710 vc->vc_tab_stop[3] =
a564738c
WK		 1711 vc->vc_tab_stop[4] =
1712 vc->vc_tab_stop[5] =
1713 vc->vc_tab_stop[6] =
1714 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1715
1716 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1717 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1718
1719 gotoxy(vc, 0, 0);
1720 save_cur(vc);
1721 if (do_clear)
1722 csi_J(vc, 2);
1723}
1724
ac751efa 1725/* console_lock is held */
1da177e4
LT		 1726static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1727{
1728 /*
1729 * Control characters can be used in the _middle_
1730 * of an escape sequence.
1731 */
63f3a16d
AB		 1732 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1733 return;
1da177e4
LT		 1734 switch (c) {
1735 case 0:
1736 return;
1737 case 7:
63f3a16d
AB		 1738 if (vc->vc_state == ESosc)
1739 vc->vc_state = ESnormal;
1740 else if (vc->vc_bell_duration)
1da177e4
LT		 1741 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1742 return;
1743 case 8:
1744 bs(vc);
1745 return;
1746 case 9:
1747 vc->vc_pos -= (vc->vc_x << 1);
1748 while (vc->vc_x < vc->vc_cols - 1) {
1749 vc->vc_x++;
1750 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1751 break;
1752 }
1753 vc->vc_pos += (vc->vc_x << 1);
b293d758 1754 notify_write(vc, '\t');
1da177e4
LT		 1755 return;
1756 case 10: case 11: case 12:
1757 lf(vc);
1758 if (!is_kbd(vc, lnm))
1759 return;
1760 case 13:
1761 cr(vc);
1762 return;
1763 case 14:
1764 vc->vc_charset = 1;
1765 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1766 vc->vc_disp_ctrl = 1;
1767 return;
1768 case 15:
1769 vc->vc_charset = 0;
1770 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1771 vc->vc_disp_ctrl = 0;
1772 return;
1773 case 24: case 26:
1774 vc->vc_state = ESnormal;
1775 return;
1776 case 27:
1777 vc->vc_state = ESesc;
1778 return;
1779 case 127:
1780 del(vc);
1781 return;
1782 case 128+27:
1783 vc->vc_state = ESsquare;
1784 return;
1785 }
1786 switch(vc->vc_state) {
1787 case ESesc:
1788 vc->vc_state = ESnormal;
1789 switch (c) {
1790 case '[':
1791 vc->vc_state = ESsquare;
1792 return;
1793 case ']':
1794 vc->vc_state = ESnonstd;
1795 return;
1796 case '%':
1797 vc->vc_state = ESpercent;
1798 return;
1799 case 'E':
1800 cr(vc);
1801 lf(vc);
1802 return;
1803 case 'M':
1804 ri(vc);
1805 return;
1806 case 'D':
1807 lf(vc);
1808 return;
1809 case 'H':
1810 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1811 return;
1812 case 'Z':
1813 respond_ID(tty);
1814 return;
1815 case '7':
1816 save_cur(vc);
1817 return;
1818 case '8':
1819 restore_cur(vc);
1820 return;
1821 case '(':
1822 vc->vc_state = ESsetG0;
1823 return;
1824 case ')':
1825 vc->vc_state = ESsetG1;
1826 return;
1827 case '#':
1828 vc->vc_state = EShash;
1829 return;
1830 case 'c':
1831 reset_terminal(vc, 1);
1832 return;
1833 case '>': /* Numeric keypad */
1834 clr_kbd(vc, kbdapplic);
1835 return;
1836 case '=': /* Appl. keypad */
1837 set_kbd(vc, kbdapplic);
1838 return;
1839 }
1840 return;
1841 case ESnonstd:
1842 if (c=='P') { /* palette escape sequence */
1843 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1844 vc->vc_par[vc->vc_npar] = 0;
1845 vc->vc_npar = 0;
1846 vc->vc_state = ESpalette;
1847 return;
1848 } else if (c=='R') { /* reset palette */
1849 reset_palette(vc);
1850 vc->vc_state = ESnormal;
63f3a16d
AB		 1851 } else if (c>='0' && c<='9')
1852 vc->vc_state = ESosc;
1853 else
1da177e4
LT		 1854 vc->vc_state = ESnormal;
1855 return;
1856 case ESpalette:
74c807ce
AS		 1857 if (isxdigit(c)) {
1858 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1859 if (vc->vc_npar == 7) {
1860 int i = vc->vc_par[0] * 3, j = 1;
1861 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1862 vc->vc_palette[i++] += vc->vc_par[j++];
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 set_palette(vc);
1868 vc->vc_state = ESnormal;
1869 }
1870 } else
1871 vc->vc_state = ESnormal;
1872 return;
1873 case ESsquare:
1874 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1875 vc->vc_par[vc->vc_npar] = 0;
1876 vc->vc_npar = 0;
1877 vc->vc_state = ESgetpars;
1878 if (c == '[') { /* Function key */
1879 vc->vc_state=ESfunckey;
1880 return;
1881 }
1882 vc->vc_ques = (c == '?');
1883 if (vc->vc_ques)
1884 return;
1885 case ESgetpars:
1886 if (c == ';' && vc->vc_npar < NPAR - 1) {
1887 vc->vc_npar++;
1888 return;
1889 } else if (c>='0' && c<='9') {
1890 vc->vc_par[vc->vc_npar] *= 10;
1891 vc->vc_par[vc->vc_npar] += c - '0';
1892 return;
b290af68 1893 }
1da177e4
LT		 1894 vc->vc_state = ESnormal;
1895 switch(c) {
1896 case 'h':
1897 set_mode(vc, 1);
1898 return;
1899 case 'l':
1900 set_mode(vc, 0);
1901 return;
1902 case 'c':
1903 if (vc->vc_ques) {
1904 if (vc->vc_par[0])
1905 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1906 else
9ea9a886 1907 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1908 return;
1909 }
1910 break;
1911 case 'm':
1912 if (vc->vc_ques) {
1913 clear_selection();
1914 if (vc->vc_par[0])
1915 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1916 else
1917 vc->vc_complement_mask = vc->vc_s_complement_mask;
1918 return;
1919 }
1920 break;
1921 case 'n':
1922 if (!vc->vc_ques) {
1923 if (vc->vc_par[0] == 5)
1924 status_report(tty);
1925 else if (vc->vc_par[0] == 6)
1926 cursor_report(vc, tty);
1927 }
1928 return;
1929 }
1930 if (vc->vc_ques) {
1931 vc->vc_ques = 0;
1932 return;
1933 }
1934 switch(c) {
1935 case 'G': case '`':
1936 if (vc->vc_par[0])
1937 vc->vc_par[0]--;
1938 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1939 return;
1940 case 'A':
1941 if (!vc->vc_par[0])
1942 vc->vc_par[0]++;
1943 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1944 return;
1945 case 'B': case 'e':
1946 if (!vc->vc_par[0])
1947 vc->vc_par[0]++;
1948 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1949 return;
1950 case 'C': case 'a':
1951 if (!vc->vc_par[0])
1952 vc->vc_par[0]++;
1953 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1954 return;
1955 case 'D':
1956 if (!vc->vc_par[0])
1957 vc->vc_par[0]++;
1958 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1959 return;
1960 case 'E':
1961 if (!vc->vc_par[0])
1962 vc->vc_par[0]++;
1963 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1964 return;
1965 case 'F':
1966 if (!vc->vc_par[0])
1967 vc->vc_par[0]++;
1968 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1969 return;
1970 case 'd':
1971 if (vc->vc_par[0])
1972 vc->vc_par[0]--;
1973 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1974 return;
1975 case 'H': case 'f':
1976 if (vc->vc_par[0])
1977 vc->vc_par[0]--;
1978 if (vc->vc_par[1])
1979 vc->vc_par[1]--;
1980 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1981 return;
1982 case 'J':
1983 csi_J(vc, vc->vc_par[0]);
1984 return;
1985 case 'K':
1986 csi_K(vc, vc->vc_par[0]);
1987 return;
1988 case 'L':
1989 csi_L(vc, vc->vc_par[0]);
1990 return;
1991 case 'M':
1992 csi_M(vc, vc->vc_par[0]);
1993 return;
1994 case 'P':
1995 csi_P(vc, vc->vc_par[0]);
1996 return;
1997 case 'c':
1998 if (!vc->vc_par[0])
1999 respond_ID(tty);
2000 return;
2001 case 'g':
2002 if (!vc->vc_par[0])
2003 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2004 else if (vc->vc_par[0] == 3) {
2005 vc->vc_tab_stop[0] =
2006 vc->vc_tab_stop[1] =
2007 vc->vc_tab_stop[2] =
2008 vc->vc_tab_stop[3] =
a564738c
WK		 2009 vc->vc_tab_stop[4] =
2010 vc->vc_tab_stop[5] =
2011 vc->vc_tab_stop[6] =
2012 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 2013 }
2014 return;
2015 case 'm':
2016 csi_m(vc);
2017 return;
2018 case 'q': /* DECLL - but only 3 leds */
2019 /* map 0,1,2,3 to 0,1,2,4 */
2020 if (vc->vc_par[0] < 4)
079c9534 2021 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2022 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2023 return;
2024 case 'r':
2025 if (!vc->vc_par[0])
2026 vc->vc_par[0]++;
2027 if (!vc->vc_par[1])
2028 vc->vc_par[1] = vc->vc_rows;
2029 /* Minimum allowed region is 2 lines */
2030 if (vc->vc_par[0] < vc->vc_par[1] &&
2031 vc->vc_par[1] <= vc->vc_rows) {
2032 vc->vc_top = vc->vc_par[0] - 1;
2033 vc->vc_bottom = vc->vc_par[1];
2034 gotoxay(vc, 0, 0);
2035 }
2036 return;
2037 case 's':
2038 save_cur(vc);
2039 return;
2040 case 'u':
2041 restore_cur(vc);
2042 return;
2043 case 'X':
2044 csi_X(vc, vc->vc_par[0]);
2045 return;
2046 case '@':
2047 csi_at(vc, vc->vc_par[0]);
2048 return;
2049 case ']': /* setterm functions */
2050 setterm_command(vc);
2051 return;
2052 }
2053 return;
2054 case ESpercent:
2055 vc->vc_state = ESnormal;
2056 switch (c) {
2057 case '@': /* defined in ISO 2022 */
2058 vc->vc_utf = 0;
2059 return;
2060 case 'G': /* prelim official escape code */
2061 case '8': /* retained for compatibility */
2062 vc->vc_utf = 1;
2063 return;
2064 }
2065 return;
2066 case ESfunckey:
2067 vc->vc_state = ESnormal;
2068 return;
2069 case EShash:
2070 vc->vc_state = ESnormal;
2071 if (c == '8') {
2072 /* DEC screen alignment test. kludge :-) */
2073 vc->vc_video_erase_char =
2074 (vc->vc_video_erase_char & 0xff00) | 'E';
2075 csi_J(vc, 2);
2076 vc->vc_video_erase_char =
2077 (vc->vc_video_erase_char & 0xff00) | ' ';
2078 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2079 }
2080 return;
2081 case ESsetG0:
2082 if (c == '0')
2083 vc->vc_G0_charset = GRAF_MAP;
2084 else if (c == 'B')
2085 vc->vc_G0_charset = LAT1_MAP;
2086 else if (c == 'U')
2087 vc->vc_G0_charset = IBMPC_MAP;
2088 else if (c == 'K')
2089 vc->vc_G0_charset = USER_MAP;
2090 if (vc->vc_charset == 0)
2091 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2092 vc->vc_state = ESnormal;
2093 return;
2094 case ESsetG1:
2095 if (c == '0')
2096 vc->vc_G1_charset = GRAF_MAP;
2097 else if (c == 'B')
2098 vc->vc_G1_charset = LAT1_MAP;
2099 else if (c == 'U')
2100 vc->vc_G1_charset = IBMPC_MAP;
2101 else if (c == 'K')
2102 vc->vc_G1_charset = USER_MAP;
2103 if (vc->vc_charset == 1)
2104 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2105 vc->vc_state = ESnormal;
2106 return;
63f3a16d
AB		 2107 case ESosc:
2108 return;
1da177e4
LT		 2109 default:
2110 vc->vc_state = ESnormal;
2111 }
2112}
2113
2f1a2ccb 2114/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2115 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2116 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2117 */
2118struct interval {
2119 uint32_t first;
2120 uint32_t last;
2121};
2122
2123static int bisearch(uint32_t ucs, const struct interval *table, int max)
2124{
2125 int min = 0;
2126 int mid;
2127
2128 if (ucs < table[0].first || ucs > table[max].last)
2129 return 0;
2130 while (max >= min) {
2131 mid = (min + max) / 2;
2132 if (ucs > table[mid].last)
2133 min = mid + 1;
2134 else if (ucs < table[mid].first)
2135 max = mid - 1;
2136 else
2137 return 1;
2138 }
2139 return 0;
2140}
2141
2142static int is_double_width(uint32_t ucs)
2143{
2144 static const struct interval double_width[] = {
2145 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2146 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2147 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2148 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2149 };
0f11541b 2150 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2151}
2152
ac751efa 2153/* acquires console_lock */
1da177e4
LT		 2154static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2155{
2156#ifdef VT_BUF_VRAM_ONLY
2157#define FLUSH do { } while(0);
2158#else
2159#define FLUSH if (draw_x >= 0) { \
2160 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2161 draw_x = -1; \
2162 }
2163#endif
2164
2165 int c, tc, ok, n = 0, draw_x = -1;
2166 unsigned int currcons;
2167 unsigned long draw_from = 0, draw_to = 0;
2168 struct vc_data *vc;
2f1a2ccb 2169 unsigned char vc_attr;
0341a4d0 2170 struct vt_notifier_param param;
2f1a2ccb
EK		 2171 uint8_t rescan;
2172 uint8_t inverse;
2173 uint8_t width;
1da177e4 2174 u16 himask, charmask;
1da177e4
LT		 2175
2176 if (in_interrupt())
2177 return count;
2178
2179 might_sleep();
2180
ac751efa 2181 console_lock();
1da177e4
LT		 2182 vc = tty->driver_data;
2183 if (vc == NULL) {
2184 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2185 console_unlock();
1da177e4
LT		 2186 return 0;
2187 }
2188
2189 currcons = vc->vc_num;
2190 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2191 /* could this happen? */
2192 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2193 console_unlock();
2194 return 0;
1da177e4 2195 }
1da177e4 2196
1da177e4
LT		 2197 himask = vc->vc_hi_font_mask;
2198 charmask = himask ? 0x1ff : 0xff;
2199
2200 /* undraw cursor first */
2201 if (IS_FG(vc))
2202 hide_cursor(vc);
2203
0341a4d0
KD		 2204 param.vc = vc;
2205
1da177e4
LT		 2206 while (!tty->stopped && count) {
2207 int orig = *buf;
2208 c = orig;
2209 buf++;
2210 n++;
2211 count--;
2f1a2ccb
EK		 2212 rescan = 0;
2213 inverse = 0;
2214 width = 1;
1da177e4
LT		 2215
2216 /* Do no translation at all in control states */
2217 if (vc->vc_state != ESnormal) {
2218 tc = c;
d4328b40 2219 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2220 /* Combine UTF-8 into Unicode in vc_utf_char.
2221 * vc_utf_count is the number of continuation bytes still
2222 * expected to arrive.
2223 * vc_npar is the number of continuation bytes arrived so
2224 * far
2225 */
d4328b40 2226rescan_last_byte:
2f1a2ccb
EK		 2227 if ((c & 0xc0) == 0x80) {
2228 /* Continuation byte received */
2229 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2230 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2231 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2232 vc->vc_npar++;
2233 if (--vc->vc_utf_count) {
2234 /* Still need some bytes */
1da177e4 2235 continue;
2f1a2ccb
EK		 2236 }
2237 /* Got a whole character */
2238 c = vc->vc_utf_char;
2239 /* Reject overlong sequences */
2240 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2241 c > utf8_length_changes[vc->vc_npar])
2242 c = 0xfffd;
2243 } else {
2244 /* Unexpected continuation byte */
2245 vc->vc_utf_count = 0;
2246 c = 0xfffd;
2247 }
1da177e4 2248 } else {
2f1a2ccb
EK		 2249 /* Single ASCII byte or first byte of a sequence received */
2250 if (vc->vc_utf_count) {
2251 /* Continuation byte expected */
2252 rescan = 1;
2253 vc->vc_utf_count = 0;
2254 c = 0xfffd;
2255 } else if (c > 0x7f) {
2256 /* First byte of a multibyte sequence received */
2257 vc->vc_npar = 0;
2258 if ((c & 0xe0) == 0xc0) {
2259 vc->vc_utf_count = 1;
2260 vc->vc_utf_char = (c & 0x1f);
2261 } else if ((c & 0xf0) == 0xe0) {
2262 vc->vc_utf_count = 2;
2263 vc->vc_utf_char = (c & 0x0f);
2264 } else if ((c & 0xf8) == 0xf0) {
2265 vc->vc_utf_count = 3;
2266 vc->vc_utf_char = (c & 0x07);
2267 } else if ((c & 0xfc) == 0xf8) {
2268 vc->vc_utf_count = 4;
2269 vc->vc_utf_char = (c & 0x03);
2270 } else if ((c & 0xfe) == 0xfc) {
2271 vc->vc_utf_count = 5;
2272 vc->vc_utf_char = (c & 0x01);
2273 } else {
2274 /* 254 and 255 are invalid */
2275 c = 0xfffd;
2276 }
2277 if (vc->vc_utf_count) {
2278 /* Still need some bytes */
2279 continue;
2280 }
2281 }
2282 /* Nothing to do if an ASCII byte was received */
1da177e4 2283 }
2f1a2ccb
EK		 2284 /* End of UTF-8 decoding. */
2285 /* c is the received character, or U+FFFD for invalid sequences. */
2286 /* Replace invalid Unicode code points with U+FFFD too */
2287 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2288 c = 0xfffd;
2289 tc = c;
d4328b40 2290 } else { /* no utf or alternate charset mode */
a29ccf6f 2291 tc = vc_translate(vc, c);
1da177e4
LT		 2292 }
2293
0341a4d0
KD		 2294 param.c = tc;
2295 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2296 &param) == NOTIFY_STOP)
2297 continue;
2298
1da177e4
LT		 2299 /* If the original code was a control character we
2300 * only allow a glyph to be displayed if the code is
2301 * not normally used (such as for cursor movement) or
2302 * if the disp_ctrl mode has been explicitly enabled.
2303 * Certain characters (as given by the CTRL_ALWAYS
2304 * bitmap) are always displayed as control characters,
2305 * as the console would be pretty useless without
2306 * them; to display an arbitrary font position use the
2307 * direct-to-font zone in UTF-8 mode.
2308 */
2309 ok = tc && (c >= 32 ||
d4328b40
AT		 2310 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2311 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2312 && (c != 127 || vc->vc_disp_ctrl)
2313 && (c != 128+27);
2314
2315 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2316 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2317 if (is_double_width(c))
2318 width = 2;
2319 }
1da177e4
LT		 2320 /* Now try to find out how to display it */
2321 tc = conv_uni_to_pc(vc, tc);
d4328b40 2322 if (tc & ~charmask) {
2f1a2ccb
EK		 2323 if (tc == -1 || tc == -2) {
2324 continue; /* nothing to display */
2325 }
2326 /* Glyph not found */
c0b79882 2327 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2328 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2329 This would make absolutely no sense with Unicode in mind,
2330 but do this for ASCII characters since a font may lack
2331 Unicode mapping info and we don't want to end up with
2332 having question marks only. */
2f1a2ccb
EK		 2333 tc = c;
2334 } else {
2335 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2336 tc = conv_uni_to_pc(vc, 0xfffd);
2337 if (tc < 0) {
2338 inverse = 1;
2339 tc = conv_uni_to_pc(vc, '?');
2340 if (tc < 0) tc = '?';
2341 }
2342 }
d4328b40 2343 }
1da177e4 2344
2f1a2ccb
EK		 2345 if (!inverse) {
2346 vc_attr = vc->vc_attr;
1da177e4 2347 } else {
2f1a2ccb
EK		 2348 /* invert vc_attr */
2349 if (!vc->vc_can_do_color) {
2350 vc_attr = (vc->vc_attr) ^ 0x08;
2351 } else if (vc->vc_hi_font_mask == 0x100) {
2352 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2353 } else {
2354 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2355 }
1ed8a2b3 2356 FLUSH
1da177e4 2357 }
2f1a2ccb
EK		 2358
2359 while (1) {
2360 if (vc->vc_need_wrap || vc->vc_decim)
2361 FLUSH
2362 if (vc->vc_need_wrap) {
2363 cr(vc);
2364 lf(vc);
2365 }
2366 if (vc->vc_decim)
2367 insert_char(vc, 1);
2368 scr_writew(himask ?
2369 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2370 (vc_attr << 8) + tc,
2371 (u16 *) vc->vc_pos);
2372 if (DO_UPDATE(vc) && draw_x < 0) {
2373 draw_x = vc->vc_x;
2374 draw_from = vc->vc_pos;
2375 }
2376 if (vc->vc_x == vc->vc_cols - 1) {
2377 vc->vc_need_wrap = vc->vc_decawm;
2378 draw_to = vc->vc_pos + 2;
2379 } else {
2380 vc->vc_x++;
2381 draw_to = (vc->vc_pos += 2);
d4328b40 2382 }
2f1a2ccb
EK		 2383
2384 if (!--width) break;
2385
2386 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2387 if (tc < 0) tc = ' ';
2388 }
b293d758 2389 notify_write(vc, c);
2f1a2ccb 2390
1ed8a2b3
EK		 2391 if (inverse) {
2392 FLUSH
2393 }
2394
2f1a2ccb
EK		 2395 if (rescan) {
2396 rescan = 0;
2397 inverse = 0;
2398 width = 1;
d4328b40
AT		 2399 c = orig;
2400 goto rescan_last_byte;
2401 }
1da177e4
LT		 2402 continue;
2403 }
2404 FLUSH
2405 do_con_trol(tty, vc, orig);
2406 }
2407 FLUSH
2408 console_conditional_schedule();
ac751efa 2409 console_unlock();
b293d758 2410 notify_update(vc);
1da177e4
LT		 2411 return n;
2412#undef FLUSH
2413}
2414
2415/*
2416 * This is the console switching callback.
2417 *
2418 * Doing console switching in a process context allows
2419 * us to do the switches asynchronously (needed when we want
2420 * to switch due to a keyboard interrupt). Synchronization
2421 * with other console code and prevention of re-entrancy is
ac751efa 2422 * ensured with console_lock.
1da177e4 2423 */
65f27f38 2424static void console_callback(struct work_struct *ignored)
1da177e4 2425{
ac751efa 2426 console_lock();
1da177e4
LT		 2427
2428 if (want_console >= 0) {
2429 if (want_console != fg_console &&
2430 vc_cons_allocated(want_console)) {
2431 hide_cursor(vc_cons[fg_console].d);
2432 change_console(vc_cons[want_console].d);
2433 /* we only changed when the console had already
2434 been allocated - a new console is not created
2435 in an interrupt routine */
2436 }
2437 want_console = -1;
2438 }
2439 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2440 do_poke_blanked_console = 0;
2441 poke_blanked_console();
2442 }
2443 if (scrollback_delta) {
2444 struct vc_data *vc = vc_cons[fg_console].d;
2445 clear_selection();
2446 if (vc->vc_mode == KD_TEXT)
2447 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2448 scrollback_delta = 0;
2449 }
2450 if (blank_timer_expired) {
2451 do_blank_screen(0);
2452 blank_timer_expired = 0;
2453 }
b293d758 2454 notify_update(vc_cons[fg_console].d);
1da177e4 2455
ac751efa 2456 console_unlock();
1da177e4
LT		 2457}
2458
b257bc05 2459int set_console(int nr)
1da177e4 2460{
b257bc05
AJ		 2461 struct vc_data *vc = vc_cons[fg_console].d;
2462
2463 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2464 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2465
2466 /*
2467 * Console switch will fail in console_callback() or
2468 * change_console() so there is no point scheduling
2469 * the callback
2470 *
2471 * Existing set_console() users don't check the return
2472 * value so this shouldn't break anything
2473 */
2474 return -EINVAL;
2475 }
2476
1da177e4
LT		 2477 want_console = nr;
2478 schedule_console_callback();
b257bc05
AJ		 2479
2480 return 0;
1da177e4
LT		 2481}
2482
2483struct tty_driver *console_driver;
2484
2485#ifdef CONFIG_VT_CONSOLE
2486
5ada918b
BW		 2487/**
2488 * vt_kmsg_redirect() - Sets/gets the kernel message console
2489 * @new: The new virtual terminal number or -1 if the console should stay
2490 * unchanged
2491 *
2492 * By default, the kernel messages are always printed on the current virtual
2493 * console. However, the user may modify that default with the
2494 * TIOCL_SETKMSGREDIRECT ioctl call.
2495 *
2496 * This function sets the kernel message console to be @new. It returns the old
2497 * virtual console number. The virtual terminal number 0 (both as parameter and
2498 * return value) means no redirection (i.e. always printed on the currently
2499 * active console).
2500 *
2501 * The parameter -1 means that only the current console is returned, but the
2502 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2503 * case to make the code more understandable.
2504 *
2505 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2506 * the parameter and always returns 0.
2507 */
2508int vt_kmsg_redirect(int new)
2509{
2510 static int kmsg_con;
2511
2512 if (new != -1)
2513 return xchg(&kmsg_con, new);
2514 else
2515 return kmsg_con;
2516}
2517
1da177e4
LT		 2518/*
2519 * Console on virtual terminal
2520 *
2521 * The console must be locked when we get here.
2522 */
2523
2524static void vt_console_print(struct console *co, const char *b, unsigned count)
2525{
2526 struct vc_data *vc = vc_cons[fg_console].d;
2527 unsigned char c;
b0940003 2528 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2529 const ushort *start;
2530 ushort cnt = 0;
2531 ushort myx;
5ada918b 2532 int kmsg_console;
1da177e4
LT		 2533
2534 /* console busy or not yet initialized */
b0940003
NP		 2535 if (!printable)
2536 return;
2537 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2538 return;
2539
5ada918b
BW		 2540 kmsg_console = vt_get_kmsg_redirect();
2541 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2542 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2543
2544 /* read `x' only after setting currcons properly (otherwise
2545 the `x' macro will read the x of the foreground console). */
2546 myx = vc->vc_x;
2547
2548 if (!vc_cons_allocated(fg_console)) {
2549 /* impossible */
2550 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2551 goto quit;
2552 }
2553
8fd4bd22 2554 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2555 goto quit;
2556
2557 /* undraw cursor first */
2558 if (IS_FG(vc))
2559 hide_cursor(vc);
2560
2561 start = (ushort *)vc->vc_pos;
2562
2563 /* Contrived structure to try to emulate original need_wrap behaviour
2564 * Problems caused when we have need_wrap set on '\n' character */
2565 while (count--) {
2566 c = *b++;
2567 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2568 if (cnt > 0) {
2569 if (CON_IS_VISIBLE(vc))
2570 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2571 vc->vc_x += cnt;
2572 if (vc->vc_need_wrap)
2573 vc->vc_x--;
2574 cnt = 0;
2575 }
2576 if (c == 8) { /* backspace */
2577 bs(vc);
2578 start = (ushort *)vc->vc_pos;
2579 myx = vc->vc_x;
2580 continue;
2581 }
2582 if (c != 13)
2583 lf(vc);
2584 cr(vc);
2585 start = (ushort *)vc->vc_pos;
2586 myx = vc->vc_x;
2587 if (c == 10 || c == 13)
2588 continue;
2589 }
2590 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2591 notify_write(vc, c);
1da177e4
LT		 2592 cnt++;
2593 if (myx == vc->vc_cols - 1) {
2594 vc->vc_need_wrap = 1;
2595 continue;
2596 }
2597 vc->vc_pos += 2;
2598 myx++;
2599 }
2600 if (cnt > 0) {
2601 if (CON_IS_VISIBLE(vc))
2602 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2603 vc->vc_x += cnt;
2604 if (vc->vc_x == vc->vc_cols) {
2605 vc->vc_x--;
2606 vc->vc_need_wrap = 1;
2607 }
2608 }
2609 set_cursor(vc);
b293d758 2610 notify_update(vc);
1da177e4
LT		 2611
2612quit:
b0940003 2613 spin_unlock(&printing_lock);
1da177e4
LT		 2614}
2615
2616static struct tty_driver *vt_console_device(struct console *c, int *index)
2617{
2618 *index = c->index ? c->index-1 : fg_console;
2619 return console_driver;
2620}
2621
2622static struct console vt_console_driver = {
2623 .name = "tty",
2624 .write = vt_console_print,
2625 .device = vt_console_device,
2626 .unblank = unblank_screen,
2627 .flags = CON_PRINTBUFFER,
2628 .index = -1,
2629};
2630#endif
2631
2632/*
2633 * Handling of Linux-specific VC ioctls
2634 */
2635
2636/*
ac751efa 2637 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2638 *
2639 * There are some functions which don't need it.
2640 *
2641 * There are some functions which can sleep for arbitrary periods
2642 * (paste_selection) but we don't need the lock there anyway.
2643 *
2644 * set_selection has locking, and definitely needs it
2645 */
2646
2647int tioclinux(struct tty_struct *tty, unsigned long arg)
2648{
2649 char type, data;
2650 char __user *p = (char __user *)arg;
2651 int lines;
2652 int ret;
2653
1da177e4
LT		 2654 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2655 return -EPERM;
2656 if (get_user(type, p))
2657 return -EFAULT;
2658 ret = 0;
04f378b1 2659
1da177e4
LT		 2660 switch (type)
2661 {
2662 case TIOCL_SETSEL:
ac751efa 2663 console_lock();
1da177e4 2664 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2665 console_unlock();
1da177e4
LT		 2666 break;
2667 case TIOCL_PASTESEL:
2668 ret = paste_selection(tty);
2669 break;
2670 case TIOCL_UNBLANKSCREEN:
ac751efa 2671 console_lock();
1da177e4 2672 unblank_screen();
ac751efa 2673 console_unlock();
1da177e4
LT		 2674 break;
2675 case TIOCL_SELLOADLUT:
5289475d 2676 console_lock();
1da177e4 2677 ret = sel_loadlut(p);
5289475d 2678 console_unlock();
1da177e4
LT		 2679 break;
2680 case TIOCL_GETSHIFTSTATE:
04f378b1 2681
1da177e4
LT		 2682 /*
2683 * Make it possible to react to Shift+Mousebutton.
2684 * Note that 'shift_state' is an undocumented
2685 * kernel-internal variable; programs not closely
2686 * related to the kernel should not use this.
2687 */
079c9534 2688 data = vt_get_shift_state();
1da177e4
LT		 2689 ret = __put_user(data, p);
2690 break;
2691 case TIOCL_GETMOUSEREPORTING:
20f62579 2692 console_lock(); /* May be overkill */
1da177e4 2693 data = mouse_reporting();
20f62579 2694 console_unlock();
1da177e4
LT		 2695 ret = __put_user(data, p);
2696 break;
2697 case TIOCL_SETVESABLANK:
20f62579 2698 console_lock();
403aac96 2699 ret = set_vesa_blanking(p);
20f62579 2700 console_unlock();
1da177e4 2701 break;
0ca07731 2702 case TIOCL_GETKMSGREDIRECT:
5ada918b 2703 data = vt_get_kmsg_redirect();
0ca07731
RW		 2704 ret = __put_user(data, p);
2705 break;
1da177e4
LT		 2706 case TIOCL_SETKMSGREDIRECT:
2707 if (!capable(CAP_SYS_ADMIN)) {
2708 ret = -EPERM;
2709 } else {
2710 if (get_user(data, p+1))
2711 ret = -EFAULT;
2712 else
5ada918b 2713 vt_kmsg_redirect(data);
1da177e4
LT		 2714 }
2715 break;
2716 case TIOCL_GETFGCONSOLE:
20f62579
AC		 2717 /* No locking needed as this is a transiently
2718 correct return anyway if the caller hasn't
2719 disabled switching */
1da177e4
LT		 2720 ret = fg_console;
2721 break;
2722 case TIOCL_SCROLLCONSOLE:
2723 if (get_user(lines, (s32 __user *)(p+4))) {
2724 ret = -EFAULT;
2725 } else {
20f62579
AC		 2726 /* Need the console lock here. Note that lots
2727 of other calls need fixing before the lock
2728 is actually useful ! */
2729 console_lock();
1da177e4 2730 scrollfront(vc_cons[fg_console].d, lines);
20f62579 2731 console_unlock();
1da177e4
LT		 2732 ret = 0;
2733 }
2734 break;
2735 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2736 console_lock();
1da177e4
LT		 2737 ignore_poke = 1;
2738 do_blank_screen(0);
ac751efa 2739 console_unlock();
1da177e4
LT		 2740 break;
2741 case TIOCL_BLANKEDSCREEN:
2742 ret = console_blanked;
2743 break;
2744 default:
2745 ret = -EINVAL;
2746 break;
2747 }
2748 return ret;
2749}
2750
2751/*
2752 * /dev/ttyN handling
2753 */
2754
2755static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2756{
2757 int retval;
2758
2759 retval = do_con_write(tty, buf, count);
2760 con_flush_chars(tty);
2761
2762 return retval;
2763}
2764
5d19f546 2765static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2766{
2767 if (in_interrupt())
5d19f546
AC		 2768 return 0; /* n_r3964 calls put_char() from interrupt context */
2769 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2770}
2771
2772static int con_write_room(struct tty_struct *tty)
2773{
2774 if (tty->stopped)
2775 return 0;
a88a69c9 2776 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2777}
2778
2779static int con_chars_in_buffer(struct tty_struct *tty)
2780{
2781 return 0; /* we're not buffering */
2782}
2783
2784/*
2785 * con_throttle and con_unthrottle are only used for
2786 * paste_selection(), which has to stuff in a large number of
2787 * characters...
2788 */
2789static void con_throttle(struct tty_struct *tty)
2790{
2791}
2792
2793static void con_unthrottle(struct tty_struct *tty)
2794{
2795 struct vc_data *vc = tty->driver_data;
2796
2797 wake_up_interruptible(&vc->paste_wait);
2798}
2799
2800/*
2801 * Turn the Scroll-Lock LED on when the tty is stopped
2802 */
2803static void con_stop(struct tty_struct *tty)
2804{
2805 int console_num;
2806 if (!tty)
2807 return;
2808 console_num = tty->index;
2809 if (!vc_cons_allocated(console_num))
2810 return;
079c9534 2811 vt_kbd_con_stop(console_num);
1da177e4
LT		 2812}
2813
2814/*
2815 * Turn the Scroll-Lock LED off when the console is started
2816 */
2817static void con_start(struct tty_struct *tty)
2818{
2819 int console_num;
2820 if (!tty)
2821 return;
2822 console_num = tty->index;
2823 if (!vc_cons_allocated(console_num))
2824 return;
079c9534 2825 vt_kbd_con_start(console_num);
1da177e4
LT		 2826}
2827
2828static void con_flush_chars(struct tty_struct *tty)
2829{
2830 struct vc_data *vc;
2831
2832 if (in_interrupt()) /* from flush_to_ldisc */
2833 return;
2834
2835 /* if we race with con_close(), vt may be null */
ac751efa 2836 console_lock();
1da177e4
LT		 2837 vc = tty->driver_data;
2838 if (vc)
2839 set_cursor(vc);
ac751efa 2840 console_unlock();
1da177e4
LT		 2841}
2842
2843/*
2844 * Allocate the console screen memory.
2845 */
bc1e99d9 2846static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 2847{
2848 unsigned int currcons = tty->index;
bc1e99d9
JS		 2849 struct vc_data *vc;
2850 int ret;
1da177e4 2851
ac751efa 2852 console_lock();
bc1e99d9
JS		 2853 ret = vc_allocate(currcons);
2854 if (ret)
2855 goto unlock;
feebed65 2856
bc1e99d9 2857 vc = vc_cons[currcons].d;
1da177e4 2858
bc1e99d9
JS		 2859 /* Still being freed */
2860 if (vc->port.tty) {
2861 ret = -ERESTARTSYS;
2862 goto unlock;
2863 }
2864
2865 ret = tty_port_install(&vc->port, driver, tty);
2866 if (ret)
2867 goto unlock;
2868
2869 tty->driver_data = vc;
2870 vc->port.tty = tty;
2871
2872 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2873 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2874 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 2875 }
bc1e99d9 2876 if (vc->vc_utf)
adc8d746 2877 tty->termios.c_iflag |= IUTF8;
bc1e99d9 2878 else
adc8d746 2879 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 2880unlock:
ac751efa 2881 console_unlock();
1da177e4
LT		 2882 return ret;
2883}
2884
bc1e99d9
JS		 2885static int con_open(struct tty_struct *tty, struct file *filp)
2886{
2887 /* everything done in install */
2888 return 0;
2889}
2890
2891
1da177e4
LT		 2892static void con_close(struct tty_struct *tty, struct file *filp)
2893{
feebed65
AC		 2894 /* Nothing to do - we defer to shutdown */
2895}
1da177e4 2896
feebed65
AC		 2897static void con_shutdown(struct tty_struct *tty)
2898{
2899 struct vc_data *vc = tty->driver_data;
2900 BUG_ON(vc == NULL);
ac751efa 2901 console_lock();
8ce73264 2902 vc->port.tty = NULL;
ac751efa 2903 console_unlock();
1da177e4
LT		 2904}
2905
3855ae1c 2906static int default_color = 7; /* white */
fa6ce9ab
JE		 2907static int default_italic_color = 2; // green (ASCII)
2908static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 2909module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 2910module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2911module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2912
1da177e4
LT		 2913static void vc_init(struct vc_data *vc, unsigned int rows,
2914 unsigned int cols, int do_clear)
2915{
2916 int j, k ;
2917
2918 vc->vc_cols = cols;
2919 vc->vc_rows = rows;
2920 vc->vc_size_row = cols << 1;
2921 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2922
2923 set_origin(vc);
2924 vc->vc_pos = vc->vc_origin;
2925 reset_vc(vc);
2926 for (j=k=0; j<16; j++) {
2927 vc->vc_palette[k++] = default_red[j] ;
2928 vc->vc_palette[k++] = default_grn[j] ;
2929 vc->vc_palette[k++] = default_blu[j] ;
2930 }
3855ae1c 2931 vc->vc_def_color = default_color;
fa6ce9ab
JE		 2932 vc->vc_ulcolor = default_underline_color;
2933 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2934 vc->vc_halfcolor = 0x08; /* grey */
2935 init_waitqueue_head(&vc->paste_wait);
2936 reset_terminal(vc, do_clear);
2937}
2938
2939/*
2940 * This routine initializes console interrupts, and does nothing
2941 * else. If you want the screen to clear, call tty_write with
2942 * the appropriate escape-sequence.
2943 */
2944
2945static int __init con_init(void)
2946{
2947 const char *display_desc = NULL;
2948 struct vc_data *vc;
3e795de7 2949 unsigned int currcons = 0, i;
1da177e4 2950
ac751efa 2951 console_lock();
1da177e4
LT		 2952
2953 if (conswitchp)
2954 display_desc = conswitchp->con_startup();
2955 if (!display_desc) {
2956 fg_console = 0;
ac751efa 2957 console_unlock();
1da177e4
LT		 2958 return 0;
2959 }
2960
3e795de7
AD		 2961 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2962 struct con_driver *con_driver = &registered_con_driver[i];
2963
2964 if (con_driver->con == NULL) {
2965 con_driver->con = conswitchp;
2966 con_driver->desc = display_desc;
2967 con_driver->flag = CON_DRIVER_FLAG_INIT;
2968 con_driver->first = 0;
2969 con_driver->last = MAX_NR_CONSOLES - 1;
2970 break;
2971 }
2972 }
2973
2974 for (i = 0; i < MAX_NR_CONSOLES; i++)
2975 con_driver_map[i] = conswitchp;
2976
1da177e4
LT		 2977 if (blankinterval) {
2978 blank_state = blank_normal_wait;
f324edc8 2979 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2980 }
2981
1da177e4 2982 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2983 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2984 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 2985 tty_port_init(&vc->port);
1da177e4 2986 visual_init(vc, currcons, 1);
a5f4f52e 2987 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 2988 vc_init(vc, vc->vc_rows, vc->vc_cols,
2989 currcons || !vc->vc_sw->con_save_screen);
2990 }
2991 currcons = fg_console = 0;
2992 master_display_fg = vc = vc_cons[currcons].d;
2993 set_origin(vc);
2994 save_screen(vc);
2995 gotoxy(vc, vc->vc_x, vc->vc_y);
2996 csi_J(vc, 0);
2997 update_screen(vc);
5da527aa 2998 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 2999 vc->vc_can_do_color ? "colour" : "mono",
3000 display_desc, vc->vc_cols, vc->vc_rows);
3001 printable = 1;
1da177e4 3002
ac751efa 3003 console_unlock();
1da177e4
LT		 3004
3005#ifdef CONFIG_VT_CONSOLE
3006 register_console(&vt_console_driver);
3007#endif
3008 return 0;
3009}
3010console_initcall(con_init);
3011
b68e31d0 3012static const struct tty_operations con_ops = {
bc1e99d9 3013 .install = con_install,
1da177e4
LT		 3014 .open = con_open,
3015 .close = con_close,
3016 .write = con_write,
3017 .write_room = con_write_room,
3018 .put_char = con_put_char,
3019 .flush_chars = con_flush_chars,
3020 .chars_in_buffer = con_chars_in_buffer,
3021 .ioctl = vt_ioctl,
e9216651
AB		 3022#ifdef CONFIG_COMPAT
3023 .compat_ioctl = vt_compat_ioctl,
3024#endif
1da177e4
LT		 3025 .stop = con_stop,
3026 .start = con_start,
3027 .throttle = con_throttle,
3028 .unthrottle = con_unthrottle,
8c9a9dd0 3029 .resize = vt_resize,
feebed65 3030 .shutdown = con_shutdown
1da177e4
LT		 3031};
3032
d81ed103
AC		 3033static struct cdev vc0_cdev;
3034
fbc92a34
KS		 3035static ssize_t show_tty_active(struct device *dev,
3036 struct device_attribute *attr, char *buf)
3037{
3038 return sprintf(buf, "tty%d\n", fg_console + 1);
3039}
3040static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3041
d81ed103 3042int __init vty_init(const struct file_operations *console_fops)
1da177e4 3043{
d81ed103
AC		 3044 cdev_init(&vc0_cdev, console_fops);
3045 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3046 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3047 panic("Couldn't register /dev/tty0 driver\n");
fbc92a34
KS		 3048 tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
3049 if (IS_ERR(tty0dev))
3050 tty0dev = NULL;
3051 else
a2a6a822 3052 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
d81ed103 3053
1da177e4
LT		 3054 vcs_init();
3055
3056 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3057 if (!console_driver)
3058 panic("Couldn't allocate console driver\n");
2f16669d 3059
1da177e4
LT		 3060 console_driver->name = "tty";
3061 console_driver->name_base = 1;
3062 console_driver->major = TTY_MAJOR;
3063 console_driver->minor_start = 1;
3064 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3065 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3066 if (default_utf8)
3067 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3068 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3069 tty_set_operations(console_driver, &con_ops);
3070 if (tty_register_driver(console_driver))
3071 panic("Couldn't register console driver\n");
1da177e4
LT		 3072 kbd_init();
3073 console_map_init();
1da177e4
LT		 3074#ifdef CONFIG_MDA_CONSOLE
3075 mda_console_init();
3076#endif
3077 return 0;
3078}
3079
3080#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3081
3082static struct class *vtconsole_class;
3083
50e244cc 3084static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3085 int deflt)
1da177e4 3086{
3e795de7
AD		 3087 struct module *owner = csw->owner;
3088 const char *desc = NULL;
3089 struct con_driver *con_driver;
3090 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3091
1da177e4
LT		 3092 if (!try_module_get(owner))
3093 return -ENODEV;
3094
50e244cc 3095 WARN_CONSOLE_UNLOCKED();
1c8ce271 3096
3e795de7
AD		 3097 /* check if driver is registered */
3098 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3099 con_driver = &registered_con_driver[i];
3100
3101 if (con_driver->con == csw) {
3102 desc = con_driver->desc;
3103 retval = 0;
3104 break;
3105 }
3106 }
3107
3108 if (retval)
3109 goto err;
3110
3111 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3112 csw->con_startup();
3113 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3114 }
1c8ce271 3115
1da177e4
LT		 3116 if (deflt) {
3117 if (conswitchp)
3118 module_put(conswitchp->owner);
1c8ce271 3119
1da177e4
LT		 3120 __module_get(owner);
3121 conswitchp = csw;
3122 }
3123
3e795de7
AD		 3124 first = max(first, con_driver->first);
3125 last = min(last, con_driver->last);
3126
1da177e4
LT		 3127 for (i = first; i <= last; i++) {
3128 int old_was_color;
3129 struct vc_data *vc = vc_cons[i].d;
3130
3131 if (con_driver_map[i])
3132 module_put(con_driver_map[i]->owner);
3133 __module_get(owner);
3134 con_driver_map[i] = csw;
3135
3136 if (!vc || !vc->vc_sw)
3137 continue;
3138
3139 j = i;
1c8ce271 3140
4ee1acce
DH		 3141 if (CON_IS_VISIBLE(vc)) {
3142 k = i;
1da177e4 3143 save_screen(vc);
4ee1acce
DH		 3144 }
3145
1da177e4
LT		 3146 old_was_color = vc->vc_can_do_color;
3147 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3148 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3149 visual_init(vc, i, 0);
1c8ce271 3150 set_origin(vc);
1da177e4
LT		 3151 update_attr(vc);
3152
3153 /* If the console changed between mono <-> color, then
3154 * the attributes in the screenbuf will be wrong. The
3155 * following resets all attributes to something sane.
3156 */
3157 if (old_was_color != vc->vc_can_do_color)
3158 clear_buffer_attributes(vc);
1da177e4 3159 }
4ee1acce 3160
1ffdda95 3161 pr_info("Console: switching ");
1da177e4
LT		 3162 if (!deflt)
3163 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3164 if (j >= 0) {
3165 struct vc_data *vc = vc_cons[j].d;
3166
1da177e4 3167 printk("to %s %s %dx%d\n",
4ee1acce
DH		 3168 vc->vc_can_do_color ? "colour" : "mono",
3169 desc, vc->vc_cols, vc->vc_rows);
3170
3171 if (k >= 0) {
3172 vc = vc_cons[k].d;
3173 update_screen(vc);
3174 }
3175 } else
1da177e4
LT		 3176 printk("to %s\n", desc);
3177
3e795de7
AD		 3178 retval = 0;
3179err:
1da177e4 3180 module_put(owner);
3e795de7
AD		 3181 return retval;
3182};
1da177e4 3183
50e244cc 3184
13ae6645
AD		 3185#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3186static int con_is_graphics(const struct consw *csw, int first, int last)
3187{
3188 int i, retval = 0;
3189
3190 for (i = first; i <= last; i++) {
3191 struct vc_data *vc = vc_cons[i].d;
3192
3193 if (vc && vc->vc_mode == KD_GRAPHICS) {
3194 retval = 1;
3195 break;
3196 }
3197 }
3198
3199 return retval;
3200}
3201
e93a9a86
TI		 3202/* unlocked version of unbind_con_driver() */
3203int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3204{
3e795de7
AD		 3205 struct module *owner = csw->owner;
3206 const struct consw *defcsw = NULL;
3207 struct con_driver *con_driver = NULL, *con_back = NULL;
3208 int i, retval = -ENODEV;
1da177e4 3209
3e795de7
AD		 3210 if (!try_module_get(owner))
3211 return -ENODEV;
3212
e93a9a86 3213 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3214
3215 /* check if driver is registered and if it is unbindable */
3216 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3217 con_driver = &registered_con_driver[i];
3218
3219 if (con_driver->con == csw &&
6db4063c 3220 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3221 retval = 0;
3222 break;
3223 }
3224 }
3225
e93a9a86 3226 if (retval)
3e795de7 3227 goto err;
3e795de7 3228
6db4063c
AD		 3229 retval = -ENODEV;
3230
3e795de7
AD		 3231 /* check if backup driver exists */
3232 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3233 con_back = &registered_con_driver[i];
3234
249f7b3e 3235 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3236 defcsw = con_back->con;
3237 retval = 0;
3238 break;
3239 }
3240 }
3241
e93a9a86 3242 if (retval)
3e795de7 3243 goto err;
3e795de7 3244
e93a9a86 3245 if (!con_is_bound(csw))
3e795de7 3246 goto err;
3e795de7
AD		 3247
3248 first = max(first, con_driver->first);
3249 last = min(last, con_driver->last);
3250
3251 for (i = first; i <= last; i++) {
1da177e4
LT		 3252 if (con_driver_map[i] == csw) {
3253 module_put(csw->owner);
3254 con_driver_map[i] = NULL;
3255 }
3e795de7
AD		 3256 }
3257
3258 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3259 const struct consw *defconsw = conswitchp;
3260
3e795de7
AD		 3261 defcsw->con_startup();
3262 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3263 /*
3264 * vgacon may change the default driver to point
3265 * to dummycon, we restore it here...
3266 */
3267 conswitchp = defconsw;
3e795de7
AD		 3268 }
3269
3270 if (!con_is_bound(csw))
3271 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3272
6db4063c 3273 /* ignore return value, binding should not fail */
50e244cc 3274 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3275err:
3276 module_put(owner);
3277 return retval;
3278
3279}
e93a9a86 3280EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3281
6db4063c
AD		 3282static int vt_bind(struct con_driver *con)
3283{
3284 const struct consw *defcsw = NULL, *csw = NULL;
3285 int i, more = 1, first = -1, last = -1, deflt = 0;
3286
3287 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3288 con_is_graphics(con->con, con->first, con->last))
3289 goto err;
3290
3291 csw = con->con;
3292
3293 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3294 struct con_driver *con = &registered_con_driver[i];
3295
3296 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3297 defcsw = con->con;
3298 break;
3299 }
3300 }
3301
3302 if (!defcsw)
3303 goto err;
3304
3305 while (more) {
3306 more = 0;
3307
3308 for (i = con->first; i <= con->last; i++) {
3309 if (con_driver_map[i] == defcsw) {
3310 if (first == -1)
3311 first = i;
3312 last = i;
3313 more = 1;
3314 } else if (first != -1)
3315 break;
3316 }
3317
3318 if (first == 0 && last == MAX_NR_CONSOLES -1)
3319 deflt = 1;
3320
c62a1e57
WY		 3321 if (first != -1) {
3322 console_lock();
3323 do_bind_con_driver(csw, first, last, deflt);
3324 console_unlock();
3325 }
6db4063c
AD		 3326
3327 first = -1;
3328 last = -1;
3329 deflt = 0;
3330 }
3331
3332err:
3333 return 0;
3334}
3335
3336static int vt_unbind(struct con_driver *con)
3337{
3338 const struct consw *csw = NULL;
3339 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3340 int ret;
6db4063c
AD		 3341
3342 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3343 con_is_graphics(con->con, con->first, con->last))
3344 goto err;
3345
3346 csw = con->con;
3347
3348 while (more) {
3349 more = 0;
3350
3351 for (i = con->first; i <= con->last; i++) {
3352 if (con_driver_map[i] == csw) {
3353 if (first == -1)
3354 first = i;
3355 last = i;
3356 more = 1;
3357 } else if (first != -1)
3358 break;
3359 }
3360
3361 if (first == 0 && last == MAX_NR_CONSOLES -1)
3362 deflt = 1;
3363
618f2b90
WY		 3364 if (first != -1) {
3365 console_lock();
f418f2ec 3366 ret = do_unbind_con_driver(csw, first, last, deflt);
618f2b90 3367 console_unlock();
f418f2ec
DV		 3368 if (ret != 0)
3369 return ret;
618f2b90 3370 }
6db4063c
AD		 3371
3372 first = -1;
3373 last = -1;
3374 deflt = 0;
3375 }
3376
3377err:
3378 return 0;
3379}
13ae6645
AD		 3380#else
3381static inline int vt_bind(struct con_driver *con)
3382{
3383 return 0;
3384}
3385static inline int vt_unbind(struct con_driver *con)
3386{
3387 return 0;
3388}
3389#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3390
805952a8 3391static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3392 const char *buf, size_t count)
3393{
805952a8 3394 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3395 int bind = simple_strtoul(buf, NULL, 0);
3396
3397 if (bind)
3398 vt_bind(con);
3399 else
3400 vt_unbind(con);
3401
3402 return count;
3403}
3404
805952a8
GKH		 3405static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3406 char *buf)
6db4063c 3407{
805952a8 3408 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3409 int bind = con_is_bound(con->con);
3410
3411 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3412}
3413
805952a8
GKH		 3414static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3415 char *buf)
6db4063c 3416{
805952a8 3417 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3418
3419 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3420 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3421 con->desc);
3422
3423}
3424
805952a8 3425static struct device_attribute device_attrs[] = {
6db4063c
AD		 3426 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3427 __ATTR(name, S_IRUGO, show_name, NULL),
3428};
3429
805952a8 3430static int vtconsole_init_device(struct con_driver *con)
6db4063c
AD		 3431{
3432 int i;
928e964f 3433 int error = 0;
6db4063c 3434
928e964f 3435 con->flag |= CON_DRIVER_FLAG_ATTR;
805952a8
GKH		 3436 dev_set_drvdata(con->dev, con);
3437 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3438 error = device_create_file(con->dev, &device_attrs[i]);
928e964f
AD		 3439 if (error)
3440 break;
3441 }
6db4063c 3442
928e964f
AD		 3443 if (error) {
3444 while (--i >= 0)
805952a8 3445 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3446 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3447 }
3448
3449 return error;
6db4063c
AD		 3450}
3451
805952a8 3452static void vtconsole_deinit_device(struct con_driver *con)
6db4063c
AD		 3453{
3454 int i;
3455
928e964f 3456 if (con->flag & CON_DRIVER_FLAG_ATTR) {
805952a8
GKH		 3457 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3458 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3459 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3460 }
6db4063c
AD		 3461}
3462
3e795de7
AD		 3463/**
3464 * con_is_bound - checks if driver is bound to the console
3465 * @csw: console driver
3466 *
3467 * RETURNS: zero if unbound, nonzero if bound
3468 *
3469 * Drivers can call this and if zero, they should release
3470 * all resources allocated on con_startup()
3471 */
3472int con_is_bound(const struct consw *csw)
3473{
3474 int i, bound = 0;
3475
3476 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3477 if (con_driver_map[i] == csw) {
3478 bound = 1;
3479 break;
3480 }
3481 }
3482
3483 return bound;
3484}
3485EXPORT_SYMBOL(con_is_bound);
3486
b45cfba4
JB		 3487/**
3488 * con_debug_enter - prepare the console for the kernel debugger
3489 * @sw: console driver
3490 *
3491 * Called when the console is taken over by the kernel debugger, this
3492 * function needs to save the current console state, then put the console
3493 * into a state suitable for the kernel debugger.
3494 *
3495 * RETURNS:
3496 * Zero on success, nonzero if a failure occurred when trying to prepare
3497 * the console for the debugger.
3498 */
3499int con_debug_enter(struct vc_data *vc)
3500{
3501 int ret = 0;
3502
3503 saved_fg_console = fg_console;
3504 saved_last_console = last_console;
3505 saved_want_console = want_console;
3506 saved_vc_mode = vc->vc_mode;
beed5336 3507 saved_console_blanked = console_blanked;
b45cfba4
JB		 3508 vc->vc_mode = KD_TEXT;
3509 console_blanked = 0;
3510 if (vc->vc_sw->con_debug_enter)
3511 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3512#ifdef CONFIG_KGDB_KDB
3513 /* Set the initial LINES variable if it is not already set */
3514 if (vc->vc_rows < 999) {
3515 int linecount;
3516 char lns[4];
3517 const char *setargs[3] = {
3518 "set",
3519 "LINES",
3520 lns,
3521 };
3522 if (kdbgetintenv(setargs[0], &linecount)) {
3523 snprintf(lns, 4, "%i", vc->vc_rows);
3524 kdb_set(2, setargs);
3525 }
3526 }
17b572e8
JW		 3527 if (vc->vc_cols < 999) {
3528 int colcount;
3529 char cols[4];
3530 const char *setargs[3] = {
3531 "set",
3532 "COLUMNS",
3533 cols,
3534 };
3535 if (kdbgetintenv(setargs[0], &colcount)) {
3536 snprintf(cols, 4, "%i", vc->vc_cols);
3537 kdb_set(2, setargs);
3538 }
3539 }
81d44507 3540#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3541 return ret;
3542}
3543EXPORT_SYMBOL_GPL(con_debug_enter);
3544
3545/**
3546 * con_debug_leave - restore console state
3547 * @sw: console driver
3548 *
3549 * Restore the console state to what it was before the kernel debugger
3550 * was invoked.
3551 *
3552 * RETURNS:
3553 * Zero on success, nonzero if a failure occurred when trying to restore
3554 * the console.
3555 */
3556int con_debug_leave(void)
3557{
3558 struct vc_data *vc;
3559 int ret = 0;
3560
3561 fg_console = saved_fg_console;
3562 last_console = saved_last_console;
3563 want_console = saved_want_console;
beed5336 3564 console_blanked = saved_console_blanked;
b45cfba4
JB		 3565 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3566
3567 vc = vc_cons[fg_console].d;
3568 if (vc->vc_sw->con_debug_leave)
3569 ret = vc->vc_sw->con_debug_leave(vc);
3570 return ret;
3571}
3572EXPORT_SYMBOL_GPL(con_debug_leave);
3573
50e244cc 3574static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 3575{
3576 struct module *owner = csw->owner;
3577 struct con_driver *con_driver;
3578 const char *desc;
3579 int i, retval = 0;
3580
50e244cc
AC		 3581 WARN_CONSOLE_UNLOCKED();
3582
3e795de7
AD		 3583 if (!try_module_get(owner))
3584 return -ENODEV;
3585
3e795de7
AD		 3586 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3587 con_driver = &registered_con_driver[i];
3588
3589 /* already registered */
3590 if (con_driver->con == csw)
c55c63c6 3591 retval = -EBUSY;
3e795de7
AD		 3592 }
3593
3594 if (retval)
3595 goto err;
3596
3597 desc = csw->con_startup();
3598
3599 if (!desc)
3600 goto err;
3601
3602 retval = -EINVAL;
3603
3604 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3605 con_driver = &registered_con_driver[i];
3606
3607 if (con_driver->con == NULL) {
3608 con_driver->con = csw;
3609 con_driver->desc = desc;
6db4063c
AD		 3610 con_driver->node = i;
3611 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3612 CON_DRIVER_FLAG_INIT;
3613 con_driver->first = first;
3614 con_driver->last = last;
3615 retval = 0;
3616 break;
3617 }
3618 }
3619
6db4063c
AD		 3620 if (retval)
3621 goto err;
3622
d81ed103 3623 con_driver->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3624 MKDEV(0, con_driver->node),
3625 NULL, "vtcon%i",
3626 con_driver->node);
6db4063c 3627
805952a8
GKH		 3628 if (IS_ERR(con_driver->dev)) {
3629 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3630 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3631 PTR_ERR(con_driver->dev));
3632 con_driver->dev = NULL;
6db4063c 3633 } else {
805952a8 3634 vtconsole_init_device(con_driver);
6db4063c 3635 }
928e964f 3636
3e795de7 3637err:
3e795de7
AD		 3638 module_put(owner);
3639 return retval;
3640}
50e244cc 3641
3e795de7
AD		 3642
3643/**
50539dd4 3644 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 3645 * @csw: console driver
3646 *
3647 * DESCRIPTION: All drivers that registers to the console layer must
3648 * call this function upon exit, or if the console driver is in a state
3649 * where it won't be able to handle console services, such as the
3650 * framebuffer console without loaded framebuffer drivers.
3651 *
3652 * The driver must unbind first prior to unregistration.
3653 */
e93a9a86
TI		 3654int do_unregister_con_driver(const struct consw *csw)
3655{
d9c660e7 3656 int i;
3e795de7
AD		 3657
3658 /* cannot unregister a bound driver */
3659 if (con_is_bound(csw))
d9c660e7
DV		 3660 return -EBUSY;
3661
3662 if (csw == conswitchp)
3663 return -EINVAL;
3e795de7
AD		 3664
3665 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3666 struct con_driver *con_driver = &registered_con_driver[i];
3667
3668 if (con_driver->con == csw &&
d9c660e7 3669 con_driver->flag & CON_DRIVER_FLAG_INIT) {
805952a8
GKH		 3670 vtconsole_deinit_device(con_driver);
3671 device_destroy(vtconsole_class,
3672 MKDEV(0, con_driver->node));
3e795de7
AD		 3673 con_driver->con = NULL;
3674 con_driver->desc = NULL;
805952a8 3675 con_driver->dev = NULL;
6db4063c 3676 con_driver->node = 0;
3e795de7
AD		 3677 con_driver->flag = 0;
3678 con_driver->first = 0;
3679 con_driver->last = 0;
d9c660e7 3680 return 0;
3e795de7
AD		 3681 }
3682 }
d9c660e7
DV		 3683
3684 return -ENODEV;
3e795de7 3685}
e93a9a86 3686EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7
AD		 3687
3688/*
3689 * If we support more console drivers, this function is used
3690 * when a driver wants to take over some existing consoles
3691 * and become default driver for newly opened ones.
3692 *
155957f5 3693 * do_take_over_console is basically a register followed by unbind
50e244cc
AC		 3694 */
3695int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3696{
3697 int err;
3698
3699 err = do_register_con_driver(csw, first, last);
3700 /*
3701 * If we get an busy error we still want to bind the console driver
3702 * and return success, as we may have unbound the console driver
3703 * but not unregistered it.
3704 */
3705 if (err == -EBUSY)
3706 err = 0;
3707 if (!err)
3708 do_bind_con_driver(csw, first, last, deflt);
3709
3710 return err;
3711}
3712EXPORT_SYMBOL_GPL(do_take_over_console);
3713
3e795de7
AD		 3714
3715/*
3716 * give_up_console is a wrapper to unregister_con_driver. It will only
3717 * work if driver is fully unbound.
3718 */
3719void give_up_console(const struct consw *csw)
3720{
70125e76
WY		 3721 console_lock();
3722 do_unregister_con_driver(csw);
3723 console_unlock();
3e795de7
AD		 3724}
3725
6db4063c 3726static int __init vtconsole_class_init(void)
3e795de7 3727{
6db4063c 3728 int i;
3e795de7 3729
6db4063c
AD		 3730 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3731 if (IS_ERR(vtconsole_class)) {
3732 printk(KERN_WARNING "Unable to create vt console class; "
3733 "errno = %ld\n", PTR_ERR(vtconsole_class));
3734 vtconsole_class = NULL;
3735 }
3e795de7 3736
6db4063c 3737 /* Add system drivers to sysfs */
3e795de7
AD		 3738 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3739 struct con_driver *con = &registered_con_driver[i];
3740
805952a8 3741 if (con->con && !con->dev) {
d81ed103 3742 con->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3743 MKDEV(0, con->node),
3744 NULL, "vtcon%i",
3745 con->node);
6db4063c 3746
805952a8 3747 if (IS_ERR(con->dev)) {
6db4063c 3748 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3749 "device for %s; errno = %ld\n",
3750 con->desc, PTR_ERR(con->dev));
3751 con->dev = NULL;
6db4063c 3752 } else {
805952a8 3753 vtconsole_init_device(con);
6db4063c 3754 }
3e795de7 3755 }
3e795de7
AD		 3756 }
3757
3e795de7
AD		 3758 return 0;
3759}
6db4063c 3760postcore_initcall(vtconsole_class_init);
3e795de7 3761
1da177e4
LT		 3762#endif
3763
3764/*
3765 * Screen blanking
3766 */
3767
403aac96 3768static int set_vesa_blanking(char __user *p)
1da177e4 3769{
403aac96
YY		 3770 unsigned int mode;
3771
3772 if (get_user(mode, p + 1))
3773 return -EFAULT;
3774
3775 vesa_blank_mode = (mode < 4) ? mode : 0;
3776 return 0;
1da177e4
LT		 3777}
3778
1da177e4
LT		 3779void do_blank_screen(int entering_gfx)
3780{
3781 struct vc_data *vc = vc_cons[fg_console].d;
3782 int i;
3783
3784 WARN_CONSOLE_UNLOCKED();
3785
3786 if (console_blanked) {
3787 if (blank_state == blank_vesa_wait) {
3788 blank_state = blank_off;
d060a321 3789 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3790 }
3791 return;
3792 }
1da177e4
LT		 3793
3794 /* entering graphics mode? */
3795 if (entering_gfx) {
3796 hide_cursor(vc);
3797 save_screen(vc);
3798 vc->vc_sw->con_blank(vc, -1, 1);
3799 console_blanked = fg_console + 1;
b6e8f00f 3800 blank_state = blank_off;
1da177e4
LT		 3801 set_origin(vc);
3802 return;
3803 }
3804
b6e8f00f 3805 if (blank_state != blank_normal_wait)
3806 return;
3807 blank_state = blank_off;
3808
1da177e4
LT		 3809 /* don't blank graphics */
3810 if (vc->vc_mode != KD_TEXT) {
3811 console_blanked = fg_console + 1;
3812 return;
3813 }
3814
3815 hide_cursor(vc);
3816 del_timer_sync(&console_timer);
3817 blank_timer_expired = 0;
3818
3819 save_screen(vc);
3820 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3821 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3822 console_blanked = fg_console + 1;
3823 if (i)
3824 set_origin(vc);
3825
3826 if (console_blank_hook && console_blank_hook(1))
3827 return;
3828
d060a321 3829 if (vesa_off_interval && vesa_blank_mode) {
030babac 3830 blank_state = blank_vesa_wait;
1da177e4
LT		 3831 mod_timer(&console_timer, jiffies + vesa_off_interval);
3832 }
8b92e87d 3833 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3834}
3835EXPORT_SYMBOL(do_blank_screen);
3836
3837/*
3838 * Called by timer as well as from vt_console_driver
3839 */
3840void do_unblank_screen(int leaving_gfx)
3841{
3842 struct vc_data *vc;
3843
3844 /* This should now always be called from a "sane" (read: can schedule)
3845 * context for the sake of the low level drivers, except in the special
3846 * case of oops_in_progress
3847 */
3848 if (!oops_in_progress)
3849 might_sleep();
3850
3851 WARN_CONSOLE_UNLOCKED();
3852
3853 ignore_poke = 0;
3854 if (!console_blanked)
3855 return;
3856 if (!vc_cons_allocated(fg_console)) {
3857 /* impossible */
1ffdda95
MSB		 3858 pr_warning("unblank_screen: tty %d not allocated ??\n",
3859 fg_console+1);
1da177e4
LT		 3860 return;
3861 }
3862 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3863 /* Try to unblank in oops case too */
3864 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3865 return; /* but leave console_blanked != 0 */
3866
3867 if (blankinterval) {
f324edc8 3868 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3869 blank_state = blank_normal_wait;
3870 }
3871
3872 console_blanked = 0;
8fd4bd22 3873 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3874 /* Low-level driver cannot restore -> do it ourselves */
3875 update_screen(vc);
3876 if (console_blank_hook)
3877 console_blank_hook(0);
3878 set_palette(vc);
3879 set_cursor(vc);
8b92e87d 3880 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3881}
3882EXPORT_SYMBOL(do_unblank_screen);
3883
3884/*
3885 * This is called by the outside world to cause a forced unblank, mostly for
3886 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3887 * call it with 1 as an argument and so force a mode restore... that may kill
3888 * X or at least garbage the screen but would also make the Oops visible...
3889 */
3890void unblank_screen(void)
3891{
3892 do_unblank_screen(0);
3893}
3894
3895/*
70522e12 3896 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3897 * (console operations can still happen at irq time, but only from printk which
70522e12 3898 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3899 */
3900static void blank_screen_t(unsigned long dummy)
3901{
cc63b1e1 3902 if (unlikely(!keventd_up())) {
f324edc8 3903 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3904 return;
3905 }
1da177e4
LT		 3906 blank_timer_expired = 1;
3907 schedule_work(&console_work);
3908}
3909
3910void poke_blanked_console(void)
3911{
3912 WARN_CONSOLE_UNLOCKED();
3913
3914 /* Add this so we quickly catch whoever might call us in a non
3915 * safe context. Nowadays, unblank_screen() isn't to be called in
3916 * atomic contexts and is allowed to schedule (with the special case
3917 * of oops_in_progress, but that isn't of any concern for this
3918 * function. --BenH.
3919 */
3920 might_sleep();
3921
3922 /* This isn't perfectly race free, but a race here would be mostly harmless,
3923 * at worse, we'll do a spurrious blank and it's unlikely
3924 */
3925 del_timer(&console_timer);
3926 blank_timer_expired = 0;
3927
3928 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3929 return;
3930 if (console_blanked)
3931 unblank_screen();
3932 else if (blankinterval) {
f324edc8 3933 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3934 blank_state = blank_normal_wait;
3935 }
3936}
3937
3938/*
3939 * Palettes
3940 */
3941
3942static void set_palette(struct vc_data *vc)
3943{
3944 WARN_CONSOLE_UNLOCKED();
3945
3946 if (vc->vc_mode != KD_GRAPHICS)
3947 vc->vc_sw->con_set_palette(vc, color_table);
3948}
3949
1da177e4
LT		 3950/*
3951 * Load palette into the DAC registers. arg points to a colour
3952 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3953 */
3954
3955int con_set_cmap(unsigned char __user *arg)
3956{
871bdea6
MG		 3957 int i, j, k;
3958 unsigned char colormap[3*16];
3959
3960 if (copy_from_user(colormap, arg, sizeof(colormap)))
3961 return -EFAULT;
1da177e4 3962
ac751efa 3963 console_lock();
871bdea6
MG		 3964 for (i = k = 0; i < 16; i++) {
3965 default_red[i] = colormap[k++];
3966 default_grn[i] = colormap[k++];
3967 default_blu[i] = colormap[k++];
3968 }
3969 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3970 if (!vc_cons_allocated(i))
3971 continue;
3972 for (j = k = 0; j < 16; j++) {
3973 vc_cons[i].d->vc_palette[k++] = default_red[j];
3974 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3975 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3976 }
3977 set_palette(vc_cons[i].d);
3978 }
ac751efa 3979 console_unlock();
1da177e4 3980
871bdea6 3981 return 0;
1da177e4
LT		 3982}
3983
3984int con_get_cmap(unsigned char __user *arg)
3985{
871bdea6
MG		 3986 int i, k;
3987 unsigned char colormap[3*16];
1da177e4 3988
ac751efa 3989 console_lock();
871bdea6
MG		 3990 for (i = k = 0; i < 16; i++) {
3991 colormap[k++] = default_red[i];
3992 colormap[k++] = default_grn[i];
3993 colormap[k++] = default_blu[i];
3994 }
ac751efa 3995 console_unlock();
1da177e4 3996
871bdea6
MG		 3997 if (copy_to_user(arg, colormap, sizeof(colormap)))
3998 return -EFAULT;
3999
4000 return 0;
1da177e4
LT		 4001}
4002
4003void reset_palette(struct vc_data *vc)
4004{
4005 int j, k;
4006 for (j=k=0; j<16; j++) {
4007 vc->vc_palette[k++] = default_red[j];
4008 vc->vc_palette[k++] = default_grn[j];
4009 vc->vc_palette[k++] = default_blu[j];
4010 }
4011 set_palette(vc);
4012}
4013
4014/*
4015 * Font switching
4016 *
4017 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4018 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4019 * depending on width) reserved for each character which is kinda wasty, but
4020 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4021 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4022 * format (maybe we should add a `fontoffset' field to the `display'
4023 * structure so we won't have to convert the fontdata all the time.
4024 * /Jes
4025 */
4026
4027#define max_font_size 65536
4028
4029static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4030{
4031 struct console_font font;
4032 int rc = -EINVAL;
4033 int c;
4034
1da177e4
LT		 4035 if (op->data) {
4036 font.data = kmalloc(max_font_size, GFP_KERNEL);
4037 if (!font.data)
4038 return -ENOMEM;
4039 } else
4040 font.data = NULL;
4041
ac751efa 4042 console_lock();
edab558f
AC		 4043 if (vc->vc_mode != KD_TEXT)
4044 rc = -EINVAL;
4045 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4046 rc = vc->vc_sw->con_font_get(vc, &font);
4047 else
4048 rc = -ENOSYS;
ac751efa 4049 console_unlock();
1da177e4
LT		 4050
4051 if (rc)
4052 goto out;
4053
4054 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4055
1da177e4
LT		 4056 if (op->data && font.charcount > op->charcount)
4057 rc = -ENOSPC;
4058 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4059 if (font.width > op->width || font.height > op->height)
4060 rc = -ENOSPC;
4061 } else {
4062 if (font.width != 8)
4063 rc = -EIO;
4064 else if ((op->height && font.height > op->height) ||
4065 font.height > 32)
4066 rc = -ENOSPC;
4067 }
4068 if (rc)
4069 goto out;
4070
4071 op->height = font.height;
4072 op->width = font.width;
4073 op->charcount = font.charcount;
4074
4075 if (op->data && copy_to_user(op->data, font.data, c))
4076 rc = -EFAULT;
4077
4078out:
4079 kfree(font.data);
4080 return rc;
4081}
4082
4083static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4084{
4085 struct console_font font;
4086 int rc = -EINVAL;
4087 int size;
4088
4089 if (vc->vc_mode != KD_TEXT)
4090 return -EINVAL;
4091 if (!op->data)
4092 return -EINVAL;
4093 if (op->charcount > 512)
4094 return -EINVAL;
4095 if (!op->height) { /* Need to guess font height [compat] */
4096 int h, i;
4097 u8 __user *charmap = op->data;
4098 u8 tmp;
4099
4100 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4101 so that we can get rid of this soon */
4102 if (!(op->flags & KD_FONT_FLAG_OLD))
4103 return -EINVAL;
4104 for (h = 32; h > 0; h--)
4105 for (i = 0; i < op->charcount; i++) {
4106 if (get_user(tmp, &charmap[32*i+h-1]))
4107 return -EFAULT;
4108 if (tmp)
4109 goto nonzero;
4110 }
4111 return -EINVAL;
4112 nonzero:
4113 op->height = h;
4114 }
4115 if (op->width <= 0 || op->width > 32 || op->height > 32)
4116 return -EINVAL;
4117 size = (op->width+7)/8 * 32 * op->charcount;
4118 if (size > max_font_size)
4119 return -ENOSPC;
4120 font.charcount = op->charcount;
4121 font.height = op->height;
4122 font.width = op->width;
9b71ca20
JL		 4123 font.data = memdup_user(op->data, size);
4124 if (IS_ERR(font.data))
4125 return PTR_ERR(font.data);
ac751efa 4126 console_lock();
edab558f
AC		 4127 if (vc->vc_mode != KD_TEXT)
4128 rc = -EINVAL;
4129 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4130 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4131 else
4132 rc = -ENOSYS;
ac751efa 4133 console_unlock();
1da177e4
LT		 4134 kfree(font.data);
4135 return rc;
4136}
4137
4138static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4139{
4140 struct console_font font = {.width = op->width, .height = op->height};
4141 char name[MAX_FONT_NAME];
4142 char *s = name;
4143 int rc;
4144
1da177e4
LT		 4145
4146 if (!op->data)
4147 s = NULL;
4148 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4149 return -EFAULT;
4150 else
4151 name[MAX_FONT_NAME - 1] = 0;
4152
ac751efa 4153 console_lock();
edab558f
AC		 4154 if (vc->vc_mode != KD_TEXT) {
4155 console_unlock();
4156 return -EINVAL;
4157 }
1da177e4
LT		 4158 if (vc->vc_sw->con_font_default)
4159 rc = vc->vc_sw->con_font_default(vc, &font, s);
4160 else
4161 rc = -ENOSYS;
ac751efa 4162 console_unlock();
1da177e4
LT		 4163 if (!rc) {
4164 op->width = font.width;
4165 op->height = font.height;
4166 }
4167 return rc;
4168}
4169
4170static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4171{
4172 int con = op->height;
4173 int rc;
4174
1da177e4 4175
ac751efa 4176 console_lock();
edab558f
AC		 4177 if (vc->vc_mode != KD_TEXT)
4178 rc = -EINVAL;
4179 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4180 rc = -ENOSYS;
4181 else if (con < 0 || !vc_cons_allocated(con))
4182 rc = -ENOTTY;
4183 else if (con == vc->vc_num) /* nothing to do */
4184 rc = 0;
4185 else
4186 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4187 console_unlock();
1da177e4
LT		 4188 return rc;
4189}
4190
4191int con_font_op(struct vc_data *vc, struct console_font_op *op)
4192{
4193 switch (op->op) {
4194 case KD_FONT_OP_SET:
4195 return con_font_set(vc, op);
4196 case KD_FONT_OP_GET:
4197 return con_font_get(vc, op);
4198 case KD_FONT_OP_SET_DEFAULT:
4199 return con_font_default(vc, op);
4200 case KD_FONT_OP_COPY:
4201 return con_font_copy(vc, op);
4202 }
4203 return -ENOSYS;
4204}
4205
4206/*
4207 * Interface exported to selection and vcs.
4208 */
4209
4210/* used by selection */
4211u16 screen_glyph(struct vc_data *vc, int offset)
4212{
4213 u16 w = scr_readw(screenpos(vc, offset, 1));
4214 u16 c = w & 0xff;
4215
4216 if (w & vc->vc_hi_font_mask)
4217 c |= 0x100;
4218 return c;
4219}
f7511d5f 4220EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4221
4222/* used by vcs - note the word offset */
4223unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4224{
4225 return screenpos(vc, 2 * w_offset, viewed);
4226}
4227
4228void getconsxy(struct vc_data *vc, unsigned char *p)
4229{
4230 p[0] = vc->vc_x;
4231 p[1] = vc->vc_y;
4232}
4233
4234void putconsxy(struct vc_data *vc, unsigned char *p)
4235{
9477e260 4236 hide_cursor(vc);
1da177e4
LT		 4237 gotoxy(vc, p[0], p[1]);
4238 set_cursor(vc);
4239}
4240
4241u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4242{
4243 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4244 return softcursor_original;
4245 return scr_readw(org);
4246}
4247
4248void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4249{
4250 scr_writew(val, org);
4251 if ((unsigned long)org == vc->vc_pos) {
4252 softcursor_original = -1;
4253 add_softcursor(vc);
4254 }
4255}
4256
432c9ed2
NP		 4257void vcs_scr_updated(struct vc_data *vc)
4258{
4259 notify_update(vc);
4260}
4261
1da177e4
LT		 4262/*
4263 * Visible symbols for modules
4264 */
4265
4266EXPORT_SYMBOL(color_table);
4267EXPORT_SYMBOL(default_red);
4268EXPORT_SYMBOL(default_grn);
4269EXPORT_SYMBOL(default_blu);
4270EXPORT_SYMBOL(update_region);
4271EXPORT_SYMBOL(redraw_screen);
4272EXPORT_SYMBOL(vc_resize);
4273EXPORT_SYMBOL(fg_console);
4274EXPORT_SYMBOL(console_blank_hook);
4275EXPORT_SYMBOL(console_blanked);
4276EXPORT_SYMBOL(vc_cons);
f6c06b68 4277EXPORT_SYMBOL(global_cursor_default);
1da177e4 4278#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4279EXPORT_SYMBOL(give_up_console);
4280#endif
Linux 6.x block layer and io_uring tree(s)