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pch_uart: Fix duplicate memory release issue
[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
159static int printable; /* Is console ready for printing? */
77bf2bab 160int default_utf8 = true;
042f10ec 161module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 162int global_cursor_default = -1;
163module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 164
9ea9a886
CL		 165static int cur_default = CUR_DEFAULT;
166module_param(cur_default, int, S_IRUGO | S_IWUSR);
167
1da177e4
LT		 168/*
169 * ignore_poke: don't unblank the screen when things are typed. This is
170 * mainly for the privacy of braille terminal users.
171 */
172static int ignore_poke;
173
174int do_poke_blanked_console;
175int console_blanked;
176
177static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 178static int vesa_off_interval;
f324edc8
DM		 179static int blankinterval = 10*60;
180core_param(consoleblank, blankinterval, int, 0444);
1da177e4 181
65f27f38 182static DECLARE_WORK(console_work, console_callback);
1da177e4
LT		 183
184/*
185 * fg_console is the current virtual console,
186 * last_console is the last used one,
187 * want_console is the console we want to switch to,
b45cfba4 188 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 189 */
190int fg_console;
191int last_console;
192int want_console = -1;
fed891c8
JW		 193static int saved_fg_console;
194static int saved_last_console;
195static int saved_want_console;
196static int saved_vc_mode;
beed5336 197static int saved_console_blanked;
1da177e4
LT		 198
199/*
200 * For each existing display, we have a pointer to console currently visible
201 * on that display, allowing consoles other than fg_console to be refreshed
202 * appropriately. Unless the low-level driver supplies its own display_fg
203 * variable, we use this one for the "master display".
204 */
205static struct vc_data *master_display_fg;
206
207/*
208 * Unfortunately, we need to delay tty echo when we're currently writing to the
209 * console since the code is (and always was) not re-entrant, so we schedule
210 * all flip requests to process context with schedule-task() and run it from
211 * console_callback().
212 */
213
214/*
215 * For the same reason, we defer scrollback to the console callback.
216 */
217static int scrollback_delta;
218
219/*
220 * Hook so that the power management routines can (un)blank
221 * the console on our behalf.
222 */
223int (*console_blank_hook)(int);
224
40565f19 225static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
1da177e4
LT		 226static int blank_state;
227static int blank_timer_expired;
228enum {
229 blank_off = 0,
230 blank_normal_wait,
231 blank_vesa_wait,
232};
233
fbc92a34
KS		 234/*
235 * /sys/class/tty/tty0/
236 *
237 * the attribute 'active' contains the name of the current vc
238 * console and it supports poll() to detect vc switches
239 */
240static struct device *tty0dev;
241
b293d758
ST		 242/*
243 * Notifier list for console events.
244 */
245static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
246
247int register_vt_notifier(struct notifier_block *nb)
248{
249 return atomic_notifier_chain_register(&vt_notifier_list, nb);
250}
251EXPORT_SYMBOL_GPL(register_vt_notifier);
252
253int unregister_vt_notifier(struct notifier_block *nb)
254{
255 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
256}
257EXPORT_SYMBOL_GPL(unregister_vt_notifier);
258
259static void notify_write(struct vc_data *vc, unsigned int unicode)
260{
502fcb79 261 struct vt_notifier_param param = { .vc = vc, .c = unicode };
b293d758
ST		 262 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
263}
264
265static void notify_update(struct vc_data *vc)
266{
267 struct vt_notifier_param param = { .vc = vc };
268 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
269}
1da177e4
LT		 270/*
271 * Low-Level Functions
272 */
273
274#define IS_FG(vc) ((vc)->vc_num == fg_console)
275
276#ifdef VT_BUF_VRAM_ONLY
277#define DO_UPDATE(vc) 0
278#else
f700d6e5 279#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
1da177e4
LT		 280#endif
281
282static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
283{
284 unsigned short *p;
285
286 if (!viewed)
287 p = (unsigned short *)(vc->vc_origin + offset);
288 else if (!vc->vc_sw->con_screen_pos)
289 p = (unsigned short *)(vc->vc_visible_origin + offset);
290 else
291 p = vc->vc_sw->con_screen_pos(vc, offset);
292 return p;
293}
294
e33ac1c1 295/* Called from the keyboard irq path.. */
1da177e4
LT		 296static inline void scrolldelta(int lines)
297{
e33ac1c1
AC		 298 /* FIXME */
299 /* scrolldelta needs some kind of consistency lock, but the BKL was
300 and still is not protecting versus the scheduled back end */
1da177e4
LT		 301 scrollback_delta += lines;
302 schedule_console_callback();
303}
304
305void schedule_console_callback(void)
306{
307 schedule_work(&console_work);
308}
309
310static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
311{
312 unsigned short *d, *s;
313
314 if (t+nr >= b)
315 nr = b - t - 1;
316 if (b > vc->vc_rows || t >= b || nr < 1)
317 return;
318 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
319 return;
320 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
321 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
322 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
386f40c8 323 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
1da177e4
LT		 324 vc->vc_size_row * nr);
325}
326
327static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
328{
329 unsigned short *s;
330 unsigned int step;
331
332 if (t+nr >= b)
333 nr = b - t - 1;
334 if (b > vc->vc_rows || t >= b || nr < 1)
335 return;
336 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
337 return;
338 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
339 step = vc->vc_cols * nr;
340 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
93f78da4 341 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
1da177e4
LT		 342}
343
344static void do_update_region(struct vc_data *vc, unsigned long start, int count)
345{
346#ifndef VT_BUF_VRAM_ONLY
347 unsigned int xx, yy, offset;
348 u16 *p;
349
350 p = (u16 *) start;
351 if (!vc->vc_sw->con_getxy) {
352 offset = (start - vc->vc_origin) / 2;
353 xx = offset % vc->vc_cols;
354 yy = offset / vc->vc_cols;
355 } else {
356 int nxx, nyy;
357 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
358 xx = nxx; yy = nyy;
359 }
360 for(;;) {
361 u16 attrib = scr_readw(p) & 0xff00;
362 int startx = xx;
363 u16 *q = p;
364 while (xx < vc->vc_cols && count) {
365 if (attrib != (scr_readw(p) & 0xff00)) {
366 if (p > q)
367 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
368 startx = xx;
369 q = p;
370 attrib = scr_readw(p) & 0xff00;
371 }
372 p++;
373 xx++;
374 count--;
375 }
376 if (p > q)
377 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
378 if (!count)
379 break;
380 xx = 0;
381 yy++;
382 if (vc->vc_sw->con_getxy) {
383 p = (u16 *)start;
384 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
385 }
386 }
387#endif
388}
389
390void update_region(struct vc_data *vc, unsigned long start, int count)
391{
392 WARN_CONSOLE_UNLOCKED();
393
394 if (DO_UPDATE(vc)) {
395 hide_cursor(vc);
396 do_update_region(vc, start, count);
397 set_cursor(vc);
398 }
399}
400
401/* Structure of attributes is hardware-dependent */
402
fa6ce9ab
JE		 403static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
404 u8 _underline, u8 _reverse, u8 _italic)
1da177e4
LT		 405{
406 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 407 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
408 _blink, _underline, _reverse, _italic);
1da177e4
LT		 409
410#ifndef VT_BUF_VRAM_ONLY
411/*
412 * ++roman: I completely changed the attribute format for monochrome
413 * mode (!can_do_color). The formerly used MDA (monochrome display
414 * adapter) format didn't allow the combination of certain effects.
415 * Now the attribute is just a bit vector:
416 * Bit 0..1: intensity (0..2)
417 * Bit 2 : underline
418 * Bit 3 : reverse
419 * Bit 7 : blink
420 */
421 {
c9e587ab 422 u8 a = _color;
1da177e4
LT		 423 if (!vc->vc_can_do_color)
424 return _intensity |
fa6ce9ab 425 (_italic ? 2 : 0) |
1da177e4
LT		 426 (_underline ? 4 : 0) |
427 (_reverse ? 8 : 0) |
428 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 429 if (_italic)
430 a = (a & 0xF0) | vc->vc_itcolor;
431 else if (_underline)
1da177e4
LT		 432 a = (a & 0xf0) | vc->vc_ulcolor;
433 else if (_intensity == 0)
434 a = (a & 0xf0) | vc->vc_ulcolor;
435 if (_reverse)
436 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
437 if (_blink)
438 a ^= 0x80;
439 if (_intensity == 2)
440 a ^= 0x08;
441 if (vc->vc_hi_font_mask == 0x100)
442 a <<= 1;
443 return a;
444 }
445#else
446 return 0;
447#endif
448}
449
450static void update_attr(struct vc_data *vc)
451{
fa6ce9ab
JE		 452 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
453 vc->vc_blink, vc->vc_underline,
454 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
455 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 456}
457
458/* Note: inverting the screen twice should revert to the original state */
459void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
460{
461 unsigned short *p;
462
463 WARN_CONSOLE_UNLOCKED();
464
465 count /= 2;
466 p = screenpos(vc, offset, viewed);
467 if (vc->vc_sw->con_invert_region)
468 vc->vc_sw->con_invert_region(vc, p, count);
469#ifndef VT_BUF_VRAM_ONLY
470 else {
471 u16 *q = p;
472 int cnt = count;
473 u16 a;
474
475 if (!vc->vc_can_do_color) {
476 while (cnt--) {
477 a = scr_readw(q);
478 a ^= 0x0800;
479 scr_writew(a, q);
480 q++;
481 }
482 } else if (vc->vc_hi_font_mask == 0x100) {
483 while (cnt--) {
484 a = scr_readw(q);
485 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
486 scr_writew(a, q);
487 q++;
488 }
489 } else {
490 while (cnt--) {
491 a = scr_readw(q);
492 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
493 scr_writew(a, q);
494 q++;
495 }
496 }
497 }
498#endif
499 if (DO_UPDATE(vc))
500 do_update_region(vc, (unsigned long) p, count);
501}
502
503/* used by selection: complement pointer position */
504void complement_pos(struct vc_data *vc, int offset)
505{
414edcd3 506 static int old_offset = -1;
1da177e4
LT		 507 static unsigned short old;
508 static unsigned short oldx, oldy;
509
510 WARN_CONSOLE_UNLOCKED();
511
414edcd3
AD		 512 if (old_offset != -1 && old_offset >= 0 &&
513 old_offset < vc->vc_screenbuf_size) {
514 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 515 if (DO_UPDATE(vc))
516 vc->vc_sw->con_putc(vc, old, oldy, oldx);
517 }
414edcd3
AD		 518
519 old_offset = offset;
520
521 if (offset != -1 && offset >= 0 &&
522 offset < vc->vc_screenbuf_size) {
1da177e4 523 unsigned short new;
414edcd3 524 unsigned short *p;
1da177e4
LT		 525 p = screenpos(vc, offset, 1);
526 old = scr_readw(p);
527 new = old ^ vc->vc_complement_mask;
528 scr_writew(new, p);
529 if (DO_UPDATE(vc)) {
530 oldx = (offset >> 1) % vc->vc_cols;
531 oldy = (offset >> 1) / vc->vc_cols;
532 vc->vc_sw->con_putc(vc, new, oldy, oldx);
533 }
534 }
414edcd3 535
1da177e4
LT		 536}
537
538static void insert_char(struct vc_data *vc, unsigned int nr)
539{
540 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
541
542 p = q + vc->vc_cols - nr - vc->vc_x;
543 while (--p >= q)
544 scr_writew(scr_readw(p), p + nr);
545 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
546 vc->vc_need_wrap = 0;
547 if (DO_UPDATE(vc)) {
548 unsigned short oldattr = vc->vc_attr;
549 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
550 vc->vc_cols - vc->vc_x - nr);
551 vc->vc_attr = vc->vc_video_erase_char >> 8;
552 while (nr--)
553 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
554 vc->vc_attr = oldattr;
555 }
556}
557
558static void delete_char(struct vc_data *vc, unsigned int nr)
559{
560 unsigned int i = vc->vc_x;
561 unsigned short *p = (unsigned short *)vc->vc_pos;
562
563 while (++i <= vc->vc_cols - nr) {
564 scr_writew(scr_readw(p+nr), p);
565 p++;
566 }
567 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
568 vc->vc_need_wrap = 0;
569 if (DO_UPDATE(vc)) {
570 unsigned short oldattr = vc->vc_attr;
571 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
572 vc->vc_cols - vc->vc_x - nr);
573 vc->vc_attr = vc->vc_video_erase_char >> 8;
574 while (nr--)
575 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
576 vc->vc_cols - 1 - nr);
577 vc->vc_attr = oldattr;
578 }
579}
580
581static int softcursor_original;
582
583static void add_softcursor(struct vc_data *vc)
584{
585 int i = scr_readw((u16 *) vc->vc_pos);
586 u32 type = vc->vc_cursor_type;
587
588 if (! (type & 0x10)) return;
589 if (softcursor_original != -1) return;
590 softcursor_original = i;
591 i |= ((type >> 8) & 0xff00 );
592 i ^= ((type) & 0xff00 );
593 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
594 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
595 scr_writew(i, (u16 *) vc->vc_pos);
596 if (DO_UPDATE(vc))
597 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
598}
599
600static void hide_softcursor(struct vc_data *vc)
601{
602 if (softcursor_original != -1) {
603 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
604 if (DO_UPDATE(vc))
605 vc->vc_sw->con_putc(vc, softcursor_original,
606 vc->vc_y, vc->vc_x);
607 softcursor_original = -1;
608 }
609}
610
611static void hide_cursor(struct vc_data *vc)
612{
613 if (vc == sel_cons)
614 clear_selection();
615 vc->vc_sw->con_cursor(vc, CM_ERASE);
616 hide_softcursor(vc);
617}
618
619static void set_cursor(struct vc_data *vc)
620{
621 if (!IS_FG(vc) || console_blanked ||
622 vc->vc_mode == KD_GRAPHICS)
623 return;
624 if (vc->vc_deccm) {
625 if (vc == sel_cons)
626 clear_selection();
627 add_softcursor(vc);
628 if ((vc->vc_cursor_type & 0x0f) != 1)
629 vc->vc_sw->con_cursor(vc, CM_DRAW);
630 } else
631 hide_cursor(vc);
632}
633
634static void set_origin(struct vc_data *vc)
635{
636 WARN_CONSOLE_UNLOCKED();
637
638 if (!CON_IS_VISIBLE(vc) ||
639 !vc->vc_sw->con_set_origin ||
640 !vc->vc_sw->con_set_origin(vc))
641 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
642 vc->vc_visible_origin = vc->vc_origin;
643 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
644 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
645}
646
647static inline void save_screen(struct vc_data *vc)
648{
649 WARN_CONSOLE_UNLOCKED();
650
651 if (vc->vc_sw->con_save_screen)
652 vc->vc_sw->con_save_screen(vc);
653}
654
655/*
656 * Redrawing of screen
657 */
658
659static void clear_buffer_attributes(struct vc_data *vc)
660{
661 unsigned short *p = (unsigned short *)vc->vc_origin;
662 int count = vc->vc_screenbuf_size / 2;
663 int mask = vc->vc_hi_font_mask | 0xff;
664
665 for (; count > 0; count--, p++) {
666 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
667 }
668}
669
670void redraw_screen(struct vc_data *vc, int is_switch)
671{
672 int redraw = 0;
673
674 WARN_CONSOLE_UNLOCKED();
675
676 if (!vc) {
677 /* strange ... */
678 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
679 return;
680 }
681
682 if (is_switch) {
683 struct vc_data *old_vc = vc_cons[fg_console].d;
684 if (old_vc == vc)
685 return;
686 if (!CON_IS_VISIBLE(vc))
687 redraw = 1;
688 *vc->vc_display_fg = vc;
689 fg_console = vc->vc_num;
690 hide_cursor(old_vc);
691 if (!CON_IS_VISIBLE(old_vc)) {
692 save_screen(old_vc);
693 set_origin(old_vc);
694 }
fbc92a34
KS		 695 if (tty0dev)
696 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 697 } else {
698 hide_cursor(vc);
699 redraw = 1;
700 }
701
702 if (redraw) {
703 int update;
704 int old_was_color = vc->vc_can_do_color;
705
706 set_origin(vc);
707 update = vc->vc_sw->con_switch(vc);
708 set_palette(vc);
709 /*
710 * If console changed from mono<->color, the best we can do
711 * is to clear the buffer attributes. As it currently stands,
712 * rebuilding new attributes from the old buffer is not doable
713 * without overly complex code.
714 */
715 if (old_was_color != vc->vc_can_do_color) {
716 update_attr(vc);
717 clear_buffer_attributes(vc);
718 }
8fd4bd22
JB		 719
720 /* Forcibly update if we're panicing */
721 if ((update && vc->vc_mode != KD_GRAPHICS) ||
722 vt_force_oops_output(vc))
1da177e4
LT		 723 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
724 }
725 set_cursor(vc);
726 if (is_switch) {
727 set_leds();
728 compute_shiftstate();
8182ec49 729 notify_update(vc);
1da177e4
LT		 730 }
731}
732
733/*
734 * Allocation, freeing and resizing of VTs.
735 */
736
737int vc_cons_allocated(unsigned int i)
738{
739 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
740}
741
742static void visual_init(struct vc_data *vc, int num, int init)
743{
744 /* ++Geert: vc->vc_sw->con_init determines console size */
745 if (vc->vc_sw)
746 module_put(vc->vc_sw->owner);
747 vc->vc_sw = conswitchp;
748#ifndef VT_SINGLE_DRIVER
749 if (con_driver_map[num])
750 vc->vc_sw = con_driver_map[num];
751#endif
752 __module_get(vc->vc_sw->owner);
753 vc->vc_num = num;
754 vc->vc_display_fg = &master_display_fg;
755 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
756 vc->vc_uni_pagedir = 0;
757 vc->vc_hi_font_mask = 0;
758 vc->vc_complement_mask = 0;
759 vc->vc_can_do_color = 0;
8fd4bd22 760 vc->vc_panic_force_write = false;
1da177e4
LT		 761 vc->vc_sw->con_init(vc, init);
762 if (!vc->vc_complement_mask)
763 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
764 vc->vc_s_complement_mask = vc->vc_complement_mask;
765 vc->vc_size_row = vc->vc_cols << 1;
766 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
767}
768
769int vc_allocate(unsigned int currcons) /* return 0 on success */
770{
771 WARN_CONSOLE_UNLOCKED();
772
773 if (currcons >= MAX_NR_CONSOLES)
774 return -ENXIO;
775 if (!vc_cons[currcons].d) {
776 struct vc_data *vc;
b293d758 777 struct vt_notifier_param param;
1da177e4
LT		 778
779 /* prevent users from taking too much memory */
780 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
781 return -EPERM;
782
783 /* due to the granularity of kmalloc, we waste some memory here */
784 /* the alloc is done in two steps, to optimize the common situation
785 of a 25x80 console (structsize=216, screenbuf_size=4000) */
786 /* although the numbers above are not valid since long ago, the
787 point is still up-to-date and the comment still has its value
788 even if only as a historical artifact. --mj, July 1998 */
b293d758 789 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1da177e4
LT		 790 if (!vc)
791 return -ENOMEM;
1da177e4 792 vc_cons[currcons].d = vc;
ff917ba4 793 tty_port_init(&vc->port);
c2c88f10 794 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 795 visual_init(vc, currcons, 1);
796 if (!*vc->vc_uni_pagedir_loc)
797 con_set_default_unimap(vc);
5c9228f0 798 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1da177e4
LT		 799 if (!vc->vc_screenbuf) {
800 kfree(vc);
801 vc_cons[currcons].d = NULL;
802 return -ENOMEM;
803 }
f6c06b68
MG		 804
805 /* If no drivers have overridden us and the user didn't pass a
806 boot option, default to displaying the cursor */
807 if (global_cursor_default == -1)
808 global_cursor_default = 1;
809
1da177e4 810 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
4995f8ef 811 vcs_make_sysfs(currcons);
b293d758 812 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1da177e4
LT		 813 }
814 return 0;
815}
816
e400b6ec
AD		 817static inline int resize_screen(struct vc_data *vc, int width, int height,
818 int user)
1da177e4
LT		 819{
820 /* Resizes the resolution of the display adapater */
821 int err = 0;
822
823 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 824 err = vc->vc_sw->con_resize(vc, width, height, user);
825
1da177e4
LT		 826 return err;
827}
828
829/*
830 * Change # of rows and columns (0 means unchanged/the size of fg_console)
831 * [this is to be used together with some user program
832 * like resize that changes the hardware videomode]
833 */
834#define VC_RESIZE_MAXCOL (32767)
835#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 836
837/**
838 * vc_do_resize - resizing method for the tty
839 * @tty: tty being resized
840 * @real_tty: real tty (different to tty if a pty/tty pair)
841 * @vc: virtual console private data
842 * @cols: columns
843 * @lines: lines
844 *
845 * Resize a virtual console, clipping according to the actual constraints.
846 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 847 * information and perform any necessary signal handling.
8c9a9dd0
AC		 848 *
849 * Caller must hold the console semaphore. Takes the termios mutex and
850 * ctrl_lock of the tty IFF a tty is passed.
851 */
852
fc6f6238
AC		 853static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
854 unsigned int cols, unsigned int lines)
1da177e4
LT		 855{
856 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 857 unsigned long end;
f2ee4ae8 858 unsigned int old_rows, old_row_size;
1da177e4 859 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 860 unsigned int user;
1da177e4
LT		 861 unsigned short *newscreen;
862
863 WARN_CONSOLE_UNLOCKED();
864
865 if (!vc)
866 return -ENXIO;
867
e400b6ec
AD		 868 user = vc->vc_resize_user;
869 vc->vc_resize_user = 0;
870
1da177e4
LT		 871 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
872 return -EINVAL;
873
874 new_cols = (cols ? cols : vc->vc_cols);
875 new_rows = (lines ? lines : vc->vc_rows);
876 new_row_size = new_cols << 1;
877 new_screen_size = new_row_size * new_rows;
878
879 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
880 return 0;
881
5cbded58 882 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 883 if (!newscreen)
884 return -ENOMEM;
885
886 old_rows = vc->vc_rows;
1da177e4 887 old_row_size = vc->vc_size_row;
1da177e4 888
e400b6ec 889 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 890 if (err) {
891 kfree(newscreen);
892 return err;
893 }
894
895 vc->vc_rows = new_rows;
896 vc->vc_cols = new_cols;
897 vc->vc_size_row = new_row_size;
898 vc->vc_screenbuf_size = new_screen_size;
899
900 rlth = min(old_row_size, new_row_size);
901 rrem = new_row_size - rlth;
902 old_origin = vc->vc_origin;
903 new_origin = (long) newscreen;
904 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 905
906 if (vc->vc_y > new_rows) {
907 if (old_rows - vc->vc_y < new_rows) {
908 /*
909 * Cursor near the bottom, copy contents from the
910 * bottom of buffer
911 */
912 old_origin += (old_rows - new_rows) * old_row_size;
3b41dc1a
AD		 913 } else {
914 /*
915 * Cursor is in no man's land, copy 1/2 screenful
916 * from the top and bottom of cursor position
917 */
918 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
3b41dc1a 919 }
9fc2b2d0
FJ		 920 }
921
922 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4
LT		 923
924 update_attr(vc);
925
3b41dc1a
AD		 926 while (old_origin < end) {
927 scr_memcpyw((unsigned short *) new_origin,
928 (unsigned short *) old_origin, rlth);
1da177e4 929 if (rrem)
3b41dc1a
AD		 930 scr_memsetw((void *)(new_origin + rlth),
931 vc->vc_video_erase_char, rrem);
1da177e4
LT		 932 old_origin += old_row_size;
933 new_origin += new_row_size;
934 }
935 if (new_scr_end > new_origin)
3b41dc1a
AD		 936 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
937 new_scr_end - new_origin);
5c9228f0 938 kfree(vc->vc_screenbuf);
1da177e4 939 vc->vc_screenbuf = newscreen;
1da177e4
LT		 940 vc->vc_screenbuf_size = new_screen_size;
941 set_origin(vc);
942
943 /* do part of a reset_terminal() */
944 vc->vc_top = 0;
945 vc->vc_bottom = vc->vc_rows;
946 gotoxy(vc, vc->vc_x, vc->vc_y);
947 save_cur(vc);
948
8c9a9dd0
AC		 949 if (tty) {
950 /* Rewrite the requested winsize data with the actual
951 resulting sizes */
952 struct winsize ws;
1da177e4
LT		 953 memset(&ws, 0, sizeof(ws));
954 ws.ws_row = vc->vc_rows;
955 ws.ws_col = vc->vc_cols;
956 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 957 tty_do_resize(tty, &ws);
1da177e4
LT		 958 }
959
960 if (CON_IS_VISIBLE(vc))
961 update_screen(vc);
8b92e87d 962 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 963 return err;
964}
965
8c9a9dd0
AC		 966/**
967 * vc_resize - resize a VT
968 * @vc: virtual console
969 * @cols: columns
970 * @rows: rows
971 *
972 * Resize a virtual console as seen from the console end of things. We
973 * use the common vc_do_resize methods to update the structures. The
974 * caller must hold the console sem to protect console internals and
8ce73264 975 * vc->port.tty
8c9a9dd0
AC		 976 */
977
978int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
979{
8ce73264 980 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 981}
982
983/**
984 * vt_resize - resize a VT
985 * @tty: tty to resize
8c9a9dd0
AC		 986 * @ws: winsize attributes
987 *
988 * Resize a virtual terminal. This is called by the tty layer as we
989 * register our own handler for resizing. The mutual helper does all
990 * the actual work.
991 *
992 * Takes the console sem and the called methods then take the tty
993 * termios_mutex and the tty ctrl_lock in that order.
994 */
da2bdf9a 995static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 996{
8c9a9dd0
AC		 997 struct vc_data *vc = tty->driver_data;
998 int ret;
ca9bda00 999
ac751efa 1000 console_lock();
fc6f6238 1001 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 1002 console_unlock();
8c9a9dd0 1003 return ret;
ca9bda00 1004}
1da177e4 1005
ca9bda00 1006void vc_deallocate(unsigned int currcons)
1da177e4
LT		 1007{
1008 WARN_CONSOLE_UNLOCKED();
1009
1010 if (vc_cons_allocated(currcons)) {
1011 struct vc_data *vc = vc_cons[currcons].d;
b293d758 1012 struct vt_notifier_param param = { .vc = vc };
4995f8ef 1013
b293d758 1014 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1015 vcs_remove_sysfs(currcons);
1da177e4 1016 vc->vc_sw->con_deinit(vc);
bde0d2c9 1017 put_pid(vc->vt_pid);
d459ec0b 1018 module_put(vc->vc_sw->owner);
5c9228f0 1019 kfree(vc->vc_screenbuf);
1da177e4
LT		 1020 if (currcons >= MIN_NR_CONSOLES)
1021 kfree(vc);
1022 vc_cons[currcons].d = NULL;
1023 }
1024}
1025
1026/*
1027 * VT102 emulator
1028 */
1029
079c9534
AC		 1030#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1031#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1032#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1033
1034#define decarm VC_REPEAT
1035#define decckm VC_CKMODE
1036#define kbdapplic VC_APPLIC
1037#define lnm VC_CRLF
1038
1039/*
1040 * this is what the terminal answers to a ESC-Z or csi0c query.
1041 */
1042#define VT100ID "\033[?1;2c"
1043#define VT102ID "\033[?6c"
1044
1045unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1046 8,12,10,14, 9,13,11,15 };
1047
1048/* the default colour table, for VGA+ colour systems */
1049int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1050 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1051int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1052 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1053int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1054 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1055
1c2bbe6a
JE		 1056module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1057module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1058module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1059
1da177e4
LT		 1060/*
1061 * gotoxy() must verify all boundaries, because the arguments
1062 * might also be negative. If the given position is out of
1063 * bounds, the cursor is placed at the nearest margin.
1064 */
1065static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1066{
1067 int min_y, max_y;
1068
1069 if (new_x < 0)
1070 vc->vc_x = 0;
1071 else {
1072 if (new_x >= vc->vc_cols)
1073 vc->vc_x = vc->vc_cols - 1;
1074 else
1075 vc->vc_x = new_x;
1076 }
1077
1078 if (vc->vc_decom) {
1079 min_y = vc->vc_top;
1080 max_y = vc->vc_bottom;
1081 } else {
1082 min_y = 0;
1083 max_y = vc->vc_rows;
1084 }
1085 if (new_y < min_y)
1086 vc->vc_y = min_y;
1087 else if (new_y >= max_y)
1088 vc->vc_y = max_y - 1;
1089 else
1090 vc->vc_y = new_y;
1091 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1092 vc->vc_need_wrap = 0;
1093}
1094
1095/* for absolute user moves, when decom is set */
1096static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1097{
1098 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1099}
1100
1101void scrollback(struct vc_data *vc, int lines)
1102{
1103 if (!lines)
1104 lines = vc->vc_rows / 2;
1105 scrolldelta(-lines);
1106}
1107
1108void scrollfront(struct vc_data *vc, int lines)
1109{
1110 if (!lines)
1111 lines = vc->vc_rows / 2;
1112 scrolldelta(lines);
1113}
1114
1115static void lf(struct vc_data *vc)
1116{
1117 /* don't scroll if above bottom of scrolling region, or
1118 * if below scrolling region
1119 */
1120 if (vc->vc_y + 1 == vc->vc_bottom)
1121 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1122 else if (vc->vc_y < vc->vc_rows - 1) {
1123 vc->vc_y++;
1124 vc->vc_pos += vc->vc_size_row;
1125 }
1126 vc->vc_need_wrap = 0;
b293d758 1127 notify_write(vc, '\n');
1da177e4
LT		 1128}
1129
1130static void ri(struct vc_data *vc)
1131{
1132 /* don't scroll if below top of scrolling region, or
1133 * if above scrolling region
1134 */
1135 if (vc->vc_y == vc->vc_top)
1136 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1137 else if (vc->vc_y > 0) {
1138 vc->vc_y--;
1139 vc->vc_pos -= vc->vc_size_row;
1140 }
1141 vc->vc_need_wrap = 0;
1142}
1143
1144static inline void cr(struct vc_data *vc)
1145{
1146 vc->vc_pos -= vc->vc_x << 1;
1147 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1148 notify_write(vc, '\r');
1da177e4
LT		 1149}
1150
1151static inline void bs(struct vc_data *vc)
1152{
1153 if (vc->vc_x) {
1154 vc->vc_pos -= 2;
1155 vc->vc_x--;
1156 vc->vc_need_wrap = 0;
b293d758 1157 notify_write(vc, '\b');
1da177e4
LT		 1158 }
1159}
1160
1161static inline void del(struct vc_data *vc)
1162{
1163 /* ignored */
1164}
1165
1166static void csi_J(struct vc_data *vc, int vpar)
1167{
1168 unsigned int count;
1169 unsigned short * start;
1170
1171 switch (vpar) {
1172 case 0: /* erase from cursor to end of display */
1173 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1174 start = (unsigned short *)vc->vc_pos;
1175 if (DO_UPDATE(vc)) {
1176 /* do in two stages */
1177 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1178 vc->vc_cols - vc->vc_x);
1179 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1180 vc->vc_rows - vc->vc_y - 1,
1181 vc->vc_cols);
1182 }
1183 break;
1184 case 1: /* erase from start to cursor */
1185 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1186 start = (unsigned short *)vc->vc_origin;
1187 if (DO_UPDATE(vc)) {
1188 /* do in two stages */
1189 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1190 vc->vc_cols);
1191 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1192 vc->vc_x + 1);
1193 }
1194 break;
f8df13e0
PP		 1195 case 3: /* erase scroll-back buffer (and whole display) */
1196 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1197 vc->vc_screenbuf_size >> 1);
1198 set_origin(vc);
1199 if (CON_IS_VISIBLE(vc))
1200 update_screen(vc);
1201 /* fall through */
1da177e4
LT		 1202 case 2: /* erase whole display */
1203 count = vc->vc_cols * vc->vc_rows;
1204 start = (unsigned short *)vc->vc_origin;
1205 if (DO_UPDATE(vc))
1206 vc->vc_sw->con_clear(vc, 0, 0,
1207 vc->vc_rows,
1208 vc->vc_cols);
1209 break;
1210 default:
1211 return;
1212 }
1213 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1214 vc->vc_need_wrap = 0;
1215}
1216
1217static void csi_K(struct vc_data *vc, int vpar)
1218{
1219 unsigned int count;
1220 unsigned short * start;
1221
1222 switch (vpar) {
1223 case 0: /* erase from cursor to end of line */
1224 count = vc->vc_cols - vc->vc_x;
1225 start = (unsigned short *)vc->vc_pos;
1226 if (DO_UPDATE(vc))
1227 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1228 vc->vc_cols - vc->vc_x);
1229 break;
1230 case 1: /* erase from start of line to cursor */
1231 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1232 count = vc->vc_x + 1;
1233 if (DO_UPDATE(vc))
1234 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1235 vc->vc_x + 1);
1236 break;
1237 case 2: /* erase whole line */
1238 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1239 count = vc->vc_cols;
1240 if (DO_UPDATE(vc))
1241 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1242 vc->vc_cols);
1243 break;
1244 default:
1245 return;
1246 }
1247 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1248 vc->vc_need_wrap = 0;
1249}
1250
1251static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1252{ /* not vt100? */
1253 int count;
1254
1255 if (!vpar)
1256 vpar++;
1257 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1258
1259 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1260 if (DO_UPDATE(vc))
1261 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1262 vc->vc_need_wrap = 0;
1263}
1264
1265static void default_attr(struct vc_data *vc)
1266{
1267 vc->vc_intensity = 1;
fa6ce9ab 1268 vc->vc_italic = 0;
1da177e4
LT		 1269 vc->vc_underline = 0;
1270 vc->vc_reverse = 0;
1271 vc->vc_blink = 0;
1272 vc->vc_color = vc->vc_def_color;
1273}
1274
ac751efa 1275/* console_lock is held */
1da177e4
LT		 1276static void csi_m(struct vc_data *vc)
1277{
1278 int i;
1279
1280 for (i = 0; i <= vc->vc_npar; i++)
1281 switch (vc->vc_par[i]) {
1282 case 0: /* all attributes off */
1283 default_attr(vc);
1284 break;
1285 case 1:
1286 vc->vc_intensity = 2;
1287 break;
1288 case 2:
1289 vc->vc_intensity = 0;
1290 break;
fa6ce9ab
JE		 1291 case 3:
1292 vc->vc_italic = 1;
1293 break;
1da177e4
LT		 1294 case 4:
1295 vc->vc_underline = 1;
1296 break;
1297 case 5:
1298 vc->vc_blink = 1;
1299 break;
1300 case 7:
1301 vc->vc_reverse = 1;
1302 break;
1303 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1304 * Select primary font, don't display
1305 * control chars if defined, don't set
1306 * bit 8 on output.
1307 */
1308 vc->vc_translate = set_translate(vc->vc_charset == 0
1309 ? vc->vc_G0_charset
1310 : vc->vc_G1_charset, vc);
1311 vc->vc_disp_ctrl = 0;
1312 vc->vc_toggle_meta = 0;
1313 break;
1314 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1315 * Select first alternate font, lets
1316 * chars < 32 be displayed as ROM chars.
1317 */
1318 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1319 vc->vc_disp_ctrl = 1;
1320 vc->vc_toggle_meta = 0;
1321 break;
1322 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1323 * Select second alternate font, toggle
1324 * high bit before displaying as ROM char.
1325 */
1326 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1327 vc->vc_disp_ctrl = 1;
1328 vc->vc_toggle_meta = 1;
1329 break;
1330 case 21:
1331 case 22:
1332 vc->vc_intensity = 1;
1333 break;
fa6ce9ab
JE		 1334 case 23:
1335 vc->vc_italic = 0;
1336 break;
1da177e4
LT		 1337 case 24:
1338 vc->vc_underline = 0;
1339 break;
1340 case 25:
1341 vc->vc_blink = 0;
1342 break;
1343 case 27:
1344 vc->vc_reverse = 0;
1345 break;
1346 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1347 * Enables underscore, white foreground
1348 * with white underscore (Linux - use
1349 * default foreground).
1350 */
1351 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1352 vc->vc_underline = 1;
1353 break;
1354 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1355 * Disable underline option.
1356 * Reset colour to default? It did this
1357 * before...
1358 */
1359 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1360 vc->vc_underline = 0;
1361 break;
1362 case 49:
1363 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1364 break;
1365 default:
1366 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1367 vc->vc_color = color_table[vc->vc_par[i] - 30]
1368 | (vc->vc_color & 0xf0);
1369 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1370 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1371 | (vc->vc_color & 0x0f);
1372 break;
1373 }
1374 update_attr(vc);
1375}
1376
1377static void respond_string(const char *p, struct tty_struct *tty)
1378{
1379 while (*p) {
1380 tty_insert_flip_char(tty, *p, 0);
1381 p++;
1382 }
1383 con_schedule_flip(tty);
1384}
1385
1386static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1387{
1388 char buf[40];
1389
1390 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1391 respond_string(buf, tty);
1392}
1393
1394static inline void status_report(struct tty_struct *tty)
1395{
1396 respond_string("\033[0n", tty); /* Terminal ok */
1397}
1398
1399static inline void respond_ID(struct tty_struct * tty)
1400{
1401 respond_string(VT102ID, tty);
1402}
1403
1404void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1405{
1406 char buf[8];
1407
1408 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1409 (char)('!' + mry));
1410 respond_string(buf, tty);
1411}
1412
1413/* invoked via ioctl(TIOCLINUX) and through set_selection */
1414int mouse_reporting(void)
1415{
1416 return vc_cons[fg_console].d->vc_report_mouse;
1417}
1418
ac751efa 1419/* console_lock is held */
1da177e4
LT		 1420static void set_mode(struct vc_data *vc, int on_off)
1421{
1422 int i;
1423
1424 for (i = 0; i <= vc->vc_npar; i++)
1425 if (vc->vc_ques) {
1426 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1427 case 1: /* Cursor keys send ^[Ox/^[[x */
1428 if (on_off)
1429 set_kbd(vc, decckm);
1430 else
1431 clr_kbd(vc, decckm);
1432 break;
1433 case 3: /* 80/132 mode switch unimplemented */
1434 vc->vc_deccolm = on_off;
1435#if 0
1436 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1437 /* this alone does not suffice; some user mode
1438 utility has to change the hardware regs */
1439#endif
1440 break;
1441 case 5: /* Inverted screen on/off */
1442 if (vc->vc_decscnm != on_off) {
1443 vc->vc_decscnm = on_off;
1444 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1445 update_attr(vc);
1446 }
1447 break;
1448 case 6: /* Origin relative/absolute */
1449 vc->vc_decom = on_off;
1450 gotoxay(vc, 0, 0);
1451 break;
1452 case 7: /* Autowrap on/off */
1453 vc->vc_decawm = on_off;
1454 break;
1455 case 8: /* Autorepeat on/off */
1456 if (on_off)
1457 set_kbd(vc, decarm);
1458 else
1459 clr_kbd(vc, decarm);
1460 break;
1461 case 9:
1462 vc->vc_report_mouse = on_off ? 1 : 0;
1463 break;
1464 case 25: /* Cursor on/off */
1465 vc->vc_deccm = on_off;
1466 break;
1467 case 1000:
1468 vc->vc_report_mouse = on_off ? 2 : 0;
1469 break;
1470 }
1471 } else {
1472 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1473 case 3: /* Monitor (display ctrls) */
1474 vc->vc_disp_ctrl = on_off;
1475 break;
1476 case 4: /* Insert Mode on/off */
1477 vc->vc_decim = on_off;
1478 break;
1479 case 20: /* Lf, Enter == CrLf/Lf */
1480 if (on_off)
1481 set_kbd(vc, lnm);
1482 else
1483 clr_kbd(vc, lnm);
1484 break;
1485 }
1486 }
1487}
1488
ac751efa 1489/* console_lock is held */
1da177e4
LT		 1490static void setterm_command(struct vc_data *vc)
1491{
1492 switch(vc->vc_par[0]) {
1493 case 1: /* set color for underline mode */
1494 if (vc->vc_can_do_color &&
1495 vc->vc_par[1] < 16) {
1496 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1497 if (vc->vc_underline)
1498 update_attr(vc);
1499 }
1500 break;
1501 case 2: /* set color for half intensity mode */
1502 if (vc->vc_can_do_color &&
1503 vc->vc_par[1] < 16) {
1504 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1505 if (vc->vc_intensity == 0)
1506 update_attr(vc);
1507 }
1508 break;
1509 case 8: /* store colors as defaults */
1510 vc->vc_def_color = vc->vc_attr;
1511 if (vc->vc_hi_font_mask == 0x100)
1512 vc->vc_def_color >>= 1;
1513 default_attr(vc);
1514 update_attr(vc);
1515 break;
1516 case 9: /* set blanking interval */
f324edc8 1517 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1518 poke_blanked_console();
1519 break;
1520 case 10: /* set bell frequency in Hz */
1521 if (vc->vc_npar >= 1)
1522 vc->vc_bell_pitch = vc->vc_par[1];
1523 else
1524 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1525 break;
1526 case 11: /* set bell duration in msec */
1527 if (vc->vc_npar >= 1)
1528 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1529 vc->vc_par[1] * HZ / 1000 : 0;
1530 else
1531 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1532 break;
1533 case 12: /* bring specified console to the front */
1534 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1535 set_console(vc->vc_par[1] - 1);
1536 break;
1537 case 13: /* unblank the screen */
1538 poke_blanked_console();
1539 break;
1540 case 14: /* set vesa powerdown interval */
1541 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1542 break;
1543 case 15: /* activate the previous console */
1544 set_console(last_console);
1545 break;
1546 }
1547}
1548
ac751efa 1549/* console_lock is held */
1da177e4
LT		 1550static void csi_at(struct vc_data *vc, unsigned int nr)
1551{
1552 if (nr > vc->vc_cols - vc->vc_x)
1553 nr = vc->vc_cols - vc->vc_x;
1554 else if (!nr)
1555 nr = 1;
1556 insert_char(vc, nr);
1557}
1558
ac751efa 1559/* console_lock is held */
1da177e4
LT		 1560static void csi_L(struct vc_data *vc, unsigned int nr)
1561{
1562 if (nr > vc->vc_rows - vc->vc_y)
1563 nr = vc->vc_rows - vc->vc_y;
1564 else if (!nr)
1565 nr = 1;
1566 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1567 vc->vc_need_wrap = 0;
1568}
1569
ac751efa 1570/* console_lock is held */
1da177e4
LT		 1571static void csi_P(struct vc_data *vc, unsigned int nr)
1572{
1573 if (nr > vc->vc_cols - vc->vc_x)
1574 nr = vc->vc_cols - vc->vc_x;
1575 else if (!nr)
1576 nr = 1;
1577 delete_char(vc, nr);
1578}
1579
ac751efa 1580/* console_lock is held */
1da177e4
LT		 1581static void csi_M(struct vc_data *vc, unsigned int nr)
1582{
1583 if (nr > vc->vc_rows - vc->vc_y)
1584 nr = vc->vc_rows - vc->vc_y;
1585 else if (!nr)
1586 nr=1;
1587 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1588 vc->vc_need_wrap = 0;
1589}
1590
ac751efa 1591/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1592static void save_cur(struct vc_data *vc)
1593{
1594 vc->vc_saved_x = vc->vc_x;
1595 vc->vc_saved_y = vc->vc_y;
1596 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1597 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1598 vc->vc_s_underline = vc->vc_underline;
1599 vc->vc_s_blink = vc->vc_blink;
1600 vc->vc_s_reverse = vc->vc_reverse;
1601 vc->vc_s_charset = vc->vc_charset;
1602 vc->vc_s_color = vc->vc_color;
1603 vc->vc_saved_G0 = vc->vc_G0_charset;
1604 vc->vc_saved_G1 = vc->vc_G1_charset;
1605}
1606
ac751efa 1607/* console_lock is held */
1da177e4
LT		 1608static void restore_cur(struct vc_data *vc)
1609{
1610 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1611 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1612 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1613 vc->vc_underline = vc->vc_s_underline;
1614 vc->vc_blink = vc->vc_s_blink;
1615 vc->vc_reverse = vc->vc_s_reverse;
1616 vc->vc_charset = vc->vc_s_charset;
1617 vc->vc_color = vc->vc_s_color;
1618 vc->vc_G0_charset = vc->vc_saved_G0;
1619 vc->vc_G1_charset = vc->vc_saved_G1;
1620 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1621 update_attr(vc);
1622 vc->vc_need_wrap = 0;
1623}
1624
1625enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1626 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1627 ESpalette };
1628
ac751efa 1629/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1630static void reset_terminal(struct vc_data *vc, int do_clear)
1631{
1632 vc->vc_top = 0;
1633 vc->vc_bottom = vc->vc_rows;
1634 vc->vc_state = ESnormal;
1635 vc->vc_ques = 0;
1636 vc->vc_translate = set_translate(LAT1_MAP, vc);
1637 vc->vc_G0_charset = LAT1_MAP;
1638 vc->vc_G1_charset = GRAF_MAP;
1639 vc->vc_charset = 0;
1640 vc->vc_need_wrap = 0;
1641 vc->vc_report_mouse = 0;
042f10ec 1642 vc->vc_utf = default_utf8;
1da177e4
LT		 1643 vc->vc_utf_count = 0;
1644
1645 vc->vc_disp_ctrl = 0;
1646 vc->vc_toggle_meta = 0;
1647
1648 vc->vc_decscnm = 0;
1649 vc->vc_decom = 0;
1650 vc->vc_decawm = 1;
f6c06b68 1651 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1652 vc->vc_decim = 0;
1653
079c9534 1654 vt_reset_keyboard(vc->vc_num);
1da177e4 1655
9ea9a886 1656 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1657 vc->vc_complement_mask = vc->vc_s_complement_mask;
1658
1659 default_attr(vc);
1660 update_attr(vc);
1661
1662 vc->vc_tab_stop[0] = 0x01010100;
1663 vc->vc_tab_stop[1] =
1664 vc->vc_tab_stop[2] =
1665 vc->vc_tab_stop[3] =
a564738c
WK		 1666 vc->vc_tab_stop[4] =
1667 vc->vc_tab_stop[5] =
1668 vc->vc_tab_stop[6] =
1669 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1670
1671 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1672 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1673
1674 gotoxy(vc, 0, 0);
1675 save_cur(vc);
1676 if (do_clear)
1677 csi_J(vc, 2);
1678}
1679
ac751efa 1680/* console_lock is held */
1da177e4
LT		 1681static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1682{
1683 /*
1684 * Control characters can be used in the _middle_
1685 * of an escape sequence.
1686 */
1687 switch (c) {
1688 case 0:
1689 return;
1690 case 7:
1691 if (vc->vc_bell_duration)
1692 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1693 return;
1694 case 8:
1695 bs(vc);
1696 return;
1697 case 9:
1698 vc->vc_pos -= (vc->vc_x << 1);
1699 while (vc->vc_x < vc->vc_cols - 1) {
1700 vc->vc_x++;
1701 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1702 break;
1703 }
1704 vc->vc_pos += (vc->vc_x << 1);
b293d758 1705 notify_write(vc, '\t');
1da177e4
LT		 1706 return;
1707 case 10: case 11: case 12:
1708 lf(vc);
1709 if (!is_kbd(vc, lnm))
1710 return;
1711 case 13:
1712 cr(vc);
1713 return;
1714 case 14:
1715 vc->vc_charset = 1;
1716 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1717 vc->vc_disp_ctrl = 1;
1718 return;
1719 case 15:
1720 vc->vc_charset = 0;
1721 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1722 vc->vc_disp_ctrl = 0;
1723 return;
1724 case 24: case 26:
1725 vc->vc_state = ESnormal;
1726 return;
1727 case 27:
1728 vc->vc_state = ESesc;
1729 return;
1730 case 127:
1731 del(vc);
1732 return;
1733 case 128+27:
1734 vc->vc_state = ESsquare;
1735 return;
1736 }
1737 switch(vc->vc_state) {
1738 case ESesc:
1739 vc->vc_state = ESnormal;
1740 switch (c) {
1741 case '[':
1742 vc->vc_state = ESsquare;
1743 return;
1744 case ']':
1745 vc->vc_state = ESnonstd;
1746 return;
1747 case '%':
1748 vc->vc_state = ESpercent;
1749 return;
1750 case 'E':
1751 cr(vc);
1752 lf(vc);
1753 return;
1754 case 'M':
1755 ri(vc);
1756 return;
1757 case 'D':
1758 lf(vc);
1759 return;
1760 case 'H':
1761 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1762 return;
1763 case 'Z':
1764 respond_ID(tty);
1765 return;
1766 case '7':
1767 save_cur(vc);
1768 return;
1769 case '8':
1770 restore_cur(vc);
1771 return;
1772 case '(':
1773 vc->vc_state = ESsetG0;
1774 return;
1775 case ')':
1776 vc->vc_state = ESsetG1;
1777 return;
1778 case '#':
1779 vc->vc_state = EShash;
1780 return;
1781 case 'c':
1782 reset_terminal(vc, 1);
1783 return;
1784 case '>': /* Numeric keypad */
1785 clr_kbd(vc, kbdapplic);
1786 return;
1787 case '=': /* Appl. keypad */
1788 set_kbd(vc, kbdapplic);
1789 return;
1790 }
1791 return;
1792 case ESnonstd:
1793 if (c=='P') { /* palette escape sequence */
1794 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1795 vc->vc_par[vc->vc_npar] = 0;
1796 vc->vc_npar = 0;
1797 vc->vc_state = ESpalette;
1798 return;
1799 } else if (c=='R') { /* reset palette */
1800 reset_palette(vc);
1801 vc->vc_state = ESnormal;
1802 } else
1803 vc->vc_state = ESnormal;
1804 return;
1805 case ESpalette:
74c807ce
AS		 1806 if (isxdigit(c)) {
1807 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1808 if (vc->vc_npar == 7) {
1809 int i = vc->vc_par[0] * 3, j = 1;
1810 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1811 vc->vc_palette[i++] += vc->vc_par[j++];
1812 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1813 vc->vc_palette[i++] += vc->vc_par[j++];
1814 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1815 vc->vc_palette[i] += vc->vc_par[j];
1816 set_palette(vc);
1817 vc->vc_state = ESnormal;
1818 }
1819 } else
1820 vc->vc_state = ESnormal;
1821 return;
1822 case ESsquare:
1823 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1824 vc->vc_par[vc->vc_npar] = 0;
1825 vc->vc_npar = 0;
1826 vc->vc_state = ESgetpars;
1827 if (c == '[') { /* Function key */
1828 vc->vc_state=ESfunckey;
1829 return;
1830 }
1831 vc->vc_ques = (c == '?');
1832 if (vc->vc_ques)
1833 return;
1834 case ESgetpars:
1835 if (c == ';' && vc->vc_npar < NPAR - 1) {
1836 vc->vc_npar++;
1837 return;
1838 } else if (c>='0' && c<='9') {
1839 vc->vc_par[vc->vc_npar] *= 10;
1840 vc->vc_par[vc->vc_npar] += c - '0';
1841 return;
1842 } else
1843 vc->vc_state = ESgotpars;
1844 case ESgotpars:
1845 vc->vc_state = ESnormal;
1846 switch(c) {
1847 case 'h':
1848 set_mode(vc, 1);
1849 return;
1850 case 'l':
1851 set_mode(vc, 0);
1852 return;
1853 case 'c':
1854 if (vc->vc_ques) {
1855 if (vc->vc_par[0])
1856 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1857 else
9ea9a886 1858 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1859 return;
1860 }
1861 break;
1862 case 'm':
1863 if (vc->vc_ques) {
1864 clear_selection();
1865 if (vc->vc_par[0])
1866 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1867 else
1868 vc->vc_complement_mask = vc->vc_s_complement_mask;
1869 return;
1870 }
1871 break;
1872 case 'n':
1873 if (!vc->vc_ques) {
1874 if (vc->vc_par[0] == 5)
1875 status_report(tty);
1876 else if (vc->vc_par[0] == 6)
1877 cursor_report(vc, tty);
1878 }
1879 return;
1880 }
1881 if (vc->vc_ques) {
1882 vc->vc_ques = 0;
1883 return;
1884 }
1885 switch(c) {
1886 case 'G': case '`':
1887 if (vc->vc_par[0])
1888 vc->vc_par[0]--;
1889 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1890 return;
1891 case 'A':
1892 if (!vc->vc_par[0])
1893 vc->vc_par[0]++;
1894 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1895 return;
1896 case 'B': case 'e':
1897 if (!vc->vc_par[0])
1898 vc->vc_par[0]++;
1899 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1900 return;
1901 case 'C': case 'a':
1902 if (!vc->vc_par[0])
1903 vc->vc_par[0]++;
1904 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1905 return;
1906 case 'D':
1907 if (!vc->vc_par[0])
1908 vc->vc_par[0]++;
1909 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1910 return;
1911 case 'E':
1912 if (!vc->vc_par[0])
1913 vc->vc_par[0]++;
1914 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1915 return;
1916 case 'F':
1917 if (!vc->vc_par[0])
1918 vc->vc_par[0]++;
1919 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1920 return;
1921 case 'd':
1922 if (vc->vc_par[0])
1923 vc->vc_par[0]--;
1924 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1925 return;
1926 case 'H': case 'f':
1927 if (vc->vc_par[0])
1928 vc->vc_par[0]--;
1929 if (vc->vc_par[1])
1930 vc->vc_par[1]--;
1931 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1932 return;
1933 case 'J':
1934 csi_J(vc, vc->vc_par[0]);
1935 return;
1936 case 'K':
1937 csi_K(vc, vc->vc_par[0]);
1938 return;
1939 case 'L':
1940 csi_L(vc, vc->vc_par[0]);
1941 return;
1942 case 'M':
1943 csi_M(vc, vc->vc_par[0]);
1944 return;
1945 case 'P':
1946 csi_P(vc, vc->vc_par[0]);
1947 return;
1948 case 'c':
1949 if (!vc->vc_par[0])
1950 respond_ID(tty);
1951 return;
1952 case 'g':
1953 if (!vc->vc_par[0])
1954 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1955 else if (vc->vc_par[0] == 3) {
1956 vc->vc_tab_stop[0] =
1957 vc->vc_tab_stop[1] =
1958 vc->vc_tab_stop[2] =
1959 vc->vc_tab_stop[3] =
a564738c
WK		 1960 vc->vc_tab_stop[4] =
1961 vc->vc_tab_stop[5] =
1962 vc->vc_tab_stop[6] =
1963 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 1964 }
1965 return;
1966 case 'm':
1967 csi_m(vc);
1968 return;
1969 case 'q': /* DECLL - but only 3 leds */
1970 /* map 0,1,2,3 to 0,1,2,4 */
1971 if (vc->vc_par[0] < 4)
079c9534 1972 vt_set_led_state(vc->vc_num,
1da177e4
LT		 1973 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1974 return;
1975 case 'r':
1976 if (!vc->vc_par[0])
1977 vc->vc_par[0]++;
1978 if (!vc->vc_par[1])
1979 vc->vc_par[1] = vc->vc_rows;
1980 /* Minimum allowed region is 2 lines */
1981 if (vc->vc_par[0] < vc->vc_par[1] &&
1982 vc->vc_par[1] <= vc->vc_rows) {
1983 vc->vc_top = vc->vc_par[0] - 1;
1984 vc->vc_bottom = vc->vc_par[1];
1985 gotoxay(vc, 0, 0);
1986 }
1987 return;
1988 case 's':
1989 save_cur(vc);
1990 return;
1991 case 'u':
1992 restore_cur(vc);
1993 return;
1994 case 'X':
1995 csi_X(vc, vc->vc_par[0]);
1996 return;
1997 case '@':
1998 csi_at(vc, vc->vc_par[0]);
1999 return;
2000 case ']': /* setterm functions */
2001 setterm_command(vc);
2002 return;
2003 }
2004 return;
2005 case ESpercent:
2006 vc->vc_state = ESnormal;
2007 switch (c) {
2008 case '@': /* defined in ISO 2022 */
2009 vc->vc_utf = 0;
2010 return;
2011 case 'G': /* prelim official escape code */
2012 case '8': /* retained for compatibility */
2013 vc->vc_utf = 1;
2014 return;
2015 }
2016 return;
2017 case ESfunckey:
2018 vc->vc_state = ESnormal;
2019 return;
2020 case EShash:
2021 vc->vc_state = ESnormal;
2022 if (c == '8') {
2023 /* DEC screen alignment test. kludge :-) */
2024 vc->vc_video_erase_char =
2025 (vc->vc_video_erase_char & 0xff00) | 'E';
2026 csi_J(vc, 2);
2027 vc->vc_video_erase_char =
2028 (vc->vc_video_erase_char & 0xff00) | ' ';
2029 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2030 }
2031 return;
2032 case ESsetG0:
2033 if (c == '0')
2034 vc->vc_G0_charset = GRAF_MAP;
2035 else if (c == 'B')
2036 vc->vc_G0_charset = LAT1_MAP;
2037 else if (c == 'U')
2038 vc->vc_G0_charset = IBMPC_MAP;
2039 else if (c == 'K')
2040 vc->vc_G0_charset = USER_MAP;
2041 if (vc->vc_charset == 0)
2042 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2043 vc->vc_state = ESnormal;
2044 return;
2045 case ESsetG1:
2046 if (c == '0')
2047 vc->vc_G1_charset = GRAF_MAP;
2048 else if (c == 'B')
2049 vc->vc_G1_charset = LAT1_MAP;
2050 else if (c == 'U')
2051 vc->vc_G1_charset = IBMPC_MAP;
2052 else if (c == 'K')
2053 vc->vc_G1_charset = USER_MAP;
2054 if (vc->vc_charset == 1)
2055 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2056 vc->vc_state = ESnormal;
2057 return;
2058 default:
2059 vc->vc_state = ESnormal;
2060 }
2061}
2062
2f1a2ccb 2063/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2064 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2065 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2066 */
2067struct interval {
2068 uint32_t first;
2069 uint32_t last;
2070};
2071
2072static int bisearch(uint32_t ucs, const struct interval *table, int max)
2073{
2074 int min = 0;
2075 int mid;
2076
2077 if (ucs < table[0].first || ucs > table[max].last)
2078 return 0;
2079 while (max >= min) {
2080 mid = (min + max) / 2;
2081 if (ucs > table[mid].last)
2082 min = mid + 1;
2083 else if (ucs < table[mid].first)
2084 max = mid - 1;
2085 else
2086 return 1;
2087 }
2088 return 0;
2089}
2090
2091static int is_double_width(uint32_t ucs)
2092{
2093 static const struct interval double_width[] = {
2094 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2095 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2096 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2097 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2098 };
0f11541b 2099 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2100}
2101
ac751efa 2102/* acquires console_lock */
1da177e4
LT		 2103static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2104{
2105#ifdef VT_BUF_VRAM_ONLY
2106#define FLUSH do { } while(0);
2107#else
2108#define FLUSH if (draw_x >= 0) { \
2109 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2110 draw_x = -1; \
2111 }
2112#endif
2113
2114 int c, tc, ok, n = 0, draw_x = -1;
2115 unsigned int currcons;
2116 unsigned long draw_from = 0, draw_to = 0;
2117 struct vc_data *vc;
2f1a2ccb 2118 unsigned char vc_attr;
0341a4d0 2119 struct vt_notifier_param param;
2f1a2ccb
EK		 2120 uint8_t rescan;
2121 uint8_t inverse;
2122 uint8_t width;
1da177e4 2123 u16 himask, charmask;
1da177e4
LT		 2124
2125 if (in_interrupt())
2126 return count;
2127
2128 might_sleep();
2129
ac751efa 2130 console_lock();
1da177e4
LT		 2131 vc = tty->driver_data;
2132 if (vc == NULL) {
2133 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2134 console_unlock();
1da177e4
LT		 2135 return 0;
2136 }
2137
2138 currcons = vc->vc_num;
2139 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2140 /* could this happen? */
2141 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2142 console_unlock();
2143 return 0;
1da177e4 2144 }
1da177e4 2145
1da177e4
LT		 2146 himask = vc->vc_hi_font_mask;
2147 charmask = himask ? 0x1ff : 0xff;
2148
2149 /* undraw cursor first */
2150 if (IS_FG(vc))
2151 hide_cursor(vc);
2152
0341a4d0
KD		 2153 param.vc = vc;
2154
1da177e4
LT		 2155 while (!tty->stopped && count) {
2156 int orig = *buf;
2157 c = orig;
2158 buf++;
2159 n++;
2160 count--;
2f1a2ccb
EK		 2161 rescan = 0;
2162 inverse = 0;
2163 width = 1;
1da177e4
LT		 2164
2165 /* Do no translation at all in control states */
2166 if (vc->vc_state != ESnormal) {
2167 tc = c;
d4328b40 2168 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2169 /* Combine UTF-8 into Unicode in vc_utf_char.
2170 * vc_utf_count is the number of continuation bytes still
2171 * expected to arrive.
2172 * vc_npar is the number of continuation bytes arrived so
2173 * far
2174 */
d4328b40 2175rescan_last_byte:
2f1a2ccb
EK		 2176 if ((c & 0xc0) == 0x80) {
2177 /* Continuation byte received */
2178 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2179 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2180 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2181 vc->vc_npar++;
2182 if (--vc->vc_utf_count) {
2183 /* Still need some bytes */
1da177e4 2184 continue;
2f1a2ccb
EK		 2185 }
2186 /* Got a whole character */
2187 c = vc->vc_utf_char;
2188 /* Reject overlong sequences */
2189 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2190 c > utf8_length_changes[vc->vc_npar])
2191 c = 0xfffd;
2192 } else {
2193 /* Unexpected continuation byte */
2194 vc->vc_utf_count = 0;
2195 c = 0xfffd;
2196 }
1da177e4 2197 } else {
2f1a2ccb
EK		 2198 /* Single ASCII byte or first byte of a sequence received */
2199 if (vc->vc_utf_count) {
2200 /* Continuation byte expected */
2201 rescan = 1;
2202 vc->vc_utf_count = 0;
2203 c = 0xfffd;
2204 } else if (c > 0x7f) {
2205 /* First byte of a multibyte sequence received */
2206 vc->vc_npar = 0;
2207 if ((c & 0xe0) == 0xc0) {
2208 vc->vc_utf_count = 1;
2209 vc->vc_utf_char = (c & 0x1f);
2210 } else if ((c & 0xf0) == 0xe0) {
2211 vc->vc_utf_count = 2;
2212 vc->vc_utf_char = (c & 0x0f);
2213 } else if ((c & 0xf8) == 0xf0) {
2214 vc->vc_utf_count = 3;
2215 vc->vc_utf_char = (c & 0x07);
2216 } else if ((c & 0xfc) == 0xf8) {
2217 vc->vc_utf_count = 4;
2218 vc->vc_utf_char = (c & 0x03);
2219 } else if ((c & 0xfe) == 0xfc) {
2220 vc->vc_utf_count = 5;
2221 vc->vc_utf_char = (c & 0x01);
2222 } else {
2223 /* 254 and 255 are invalid */
2224 c = 0xfffd;
2225 }
2226 if (vc->vc_utf_count) {
2227 /* Still need some bytes */
2228 continue;
2229 }
2230 }
2231 /* Nothing to do if an ASCII byte was received */
1da177e4 2232 }
2f1a2ccb
EK		 2233 /* End of UTF-8 decoding. */
2234 /* c is the received character, or U+FFFD for invalid sequences. */
2235 /* Replace invalid Unicode code points with U+FFFD too */
2236 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2237 c = 0xfffd;
2238 tc = c;
d4328b40 2239 } else { /* no utf or alternate charset mode */
a29ccf6f 2240 tc = vc_translate(vc, c);
1da177e4
LT		 2241 }
2242
0341a4d0
KD		 2243 param.c = tc;
2244 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2245 &param) == NOTIFY_STOP)
2246 continue;
2247
1da177e4
LT		 2248 /* If the original code was a control character we
2249 * only allow a glyph to be displayed if the code is
2250 * not normally used (such as for cursor movement) or
2251 * if the disp_ctrl mode has been explicitly enabled.
2252 * Certain characters (as given by the CTRL_ALWAYS
2253 * bitmap) are always displayed as control characters,
2254 * as the console would be pretty useless without
2255 * them; to display an arbitrary font position use the
2256 * direct-to-font zone in UTF-8 mode.
2257 */
2258 ok = tc && (c >= 32 ||
d4328b40
AT		 2259 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2260 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2261 && (c != 127 || vc->vc_disp_ctrl)
2262 && (c != 128+27);
2263
2264 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2265 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2266 if (is_double_width(c))
2267 width = 2;
2268 }
1da177e4
LT		 2269 /* Now try to find out how to display it */
2270 tc = conv_uni_to_pc(vc, tc);
d4328b40 2271 if (tc & ~charmask) {
2f1a2ccb
EK		 2272 if (tc == -1 || tc == -2) {
2273 continue; /* nothing to display */
2274 }
2275 /* Glyph not found */
c0b79882 2276 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2277 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2278 This would make absolutely no sense with Unicode in mind,
2279 but do this for ASCII characters since a font may lack
2280 Unicode mapping info and we don't want to end up with
2281 having question marks only. */
2f1a2ccb
EK		 2282 tc = c;
2283 } else {
2284 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2285 tc = conv_uni_to_pc(vc, 0xfffd);
2286 if (tc < 0) {
2287 inverse = 1;
2288 tc = conv_uni_to_pc(vc, '?');
2289 if (tc < 0) tc = '?';
2290 }
2291 }
d4328b40 2292 }
1da177e4 2293
2f1a2ccb
EK		 2294 if (!inverse) {
2295 vc_attr = vc->vc_attr;
1da177e4 2296 } else {
2f1a2ccb
EK		 2297 /* invert vc_attr */
2298 if (!vc->vc_can_do_color) {
2299 vc_attr = (vc->vc_attr) ^ 0x08;
2300 } else if (vc->vc_hi_font_mask == 0x100) {
2301 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2302 } else {
2303 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2304 }
1ed8a2b3 2305 FLUSH
1da177e4 2306 }
2f1a2ccb
EK		 2307
2308 while (1) {
2309 if (vc->vc_need_wrap || vc->vc_decim)
2310 FLUSH
2311 if (vc->vc_need_wrap) {
2312 cr(vc);
2313 lf(vc);
2314 }
2315 if (vc->vc_decim)
2316 insert_char(vc, 1);
2317 scr_writew(himask ?
2318 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2319 (vc_attr << 8) + tc,
2320 (u16 *) vc->vc_pos);
2321 if (DO_UPDATE(vc) && draw_x < 0) {
2322 draw_x = vc->vc_x;
2323 draw_from = vc->vc_pos;
2324 }
2325 if (vc->vc_x == vc->vc_cols - 1) {
2326 vc->vc_need_wrap = vc->vc_decawm;
2327 draw_to = vc->vc_pos + 2;
2328 } else {
2329 vc->vc_x++;
2330 draw_to = (vc->vc_pos += 2);
d4328b40 2331 }
2f1a2ccb
EK		 2332
2333 if (!--width) break;
2334
2335 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2336 if (tc < 0) tc = ' ';
2337 }
b293d758 2338 notify_write(vc, c);
2f1a2ccb 2339
1ed8a2b3
EK		 2340 if (inverse) {
2341 FLUSH
2342 }
2343
2f1a2ccb
EK		 2344 if (rescan) {
2345 rescan = 0;
2346 inverse = 0;
2347 width = 1;
d4328b40
AT		 2348 c = orig;
2349 goto rescan_last_byte;
2350 }
1da177e4
LT		 2351 continue;
2352 }
2353 FLUSH
2354 do_con_trol(tty, vc, orig);
2355 }
2356 FLUSH
2357 console_conditional_schedule();
ac751efa 2358 console_unlock();
b293d758 2359 notify_update(vc);
1da177e4
LT		 2360 return n;
2361#undef FLUSH
2362}
2363
2364/*
2365 * This is the console switching callback.
2366 *
2367 * Doing console switching in a process context allows
2368 * us to do the switches asynchronously (needed when we want
2369 * to switch due to a keyboard interrupt). Synchronization
2370 * with other console code and prevention of re-entrancy is
ac751efa 2371 * ensured with console_lock.
1da177e4 2372 */
65f27f38 2373static void console_callback(struct work_struct *ignored)
1da177e4 2374{
ac751efa 2375 console_lock();
1da177e4
LT		 2376
2377 if (want_console >= 0) {
2378 if (want_console != fg_console &&
2379 vc_cons_allocated(want_console)) {
2380 hide_cursor(vc_cons[fg_console].d);
2381 change_console(vc_cons[want_console].d);
2382 /* we only changed when the console had already
2383 been allocated - a new console is not created
2384 in an interrupt routine */
2385 }
2386 want_console = -1;
2387 }
2388 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2389 do_poke_blanked_console = 0;
2390 poke_blanked_console();
2391 }
2392 if (scrollback_delta) {
2393 struct vc_data *vc = vc_cons[fg_console].d;
2394 clear_selection();
2395 if (vc->vc_mode == KD_TEXT)
2396 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2397 scrollback_delta = 0;
2398 }
2399 if (blank_timer_expired) {
2400 do_blank_screen(0);
2401 blank_timer_expired = 0;
2402 }
b293d758 2403 notify_update(vc_cons[fg_console].d);
1da177e4 2404
ac751efa 2405 console_unlock();
1da177e4
LT		 2406}
2407
b257bc05 2408int set_console(int nr)
1da177e4 2409{
b257bc05
AJ		 2410 struct vc_data *vc = vc_cons[fg_console].d;
2411
2412 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2413 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2414
2415 /*
2416 * Console switch will fail in console_callback() or
2417 * change_console() so there is no point scheduling
2418 * the callback
2419 *
2420 * Existing set_console() users don't check the return
2421 * value so this shouldn't break anything
2422 */
2423 return -EINVAL;
2424 }
2425
1da177e4
LT		 2426 want_console = nr;
2427 schedule_console_callback();
b257bc05
AJ		 2428
2429 return 0;
1da177e4
LT		 2430}
2431
2432struct tty_driver *console_driver;
2433
2434#ifdef CONFIG_VT_CONSOLE
2435
5ada918b
BW		 2436/**
2437 * vt_kmsg_redirect() - Sets/gets the kernel message console
2438 * @new: The new virtual terminal number or -1 if the console should stay
2439 * unchanged
2440 *
2441 * By default, the kernel messages are always printed on the current virtual
2442 * console. However, the user may modify that default with the
2443 * TIOCL_SETKMSGREDIRECT ioctl call.
2444 *
2445 * This function sets the kernel message console to be @new. It returns the old
2446 * virtual console number. The virtual terminal number 0 (both as parameter and
2447 * return value) means no redirection (i.e. always printed on the currently
2448 * active console).
2449 *
2450 * The parameter -1 means that only the current console is returned, but the
2451 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2452 * case to make the code more understandable.
2453 *
2454 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2455 * the parameter and always returns 0.
2456 */
2457int vt_kmsg_redirect(int new)
2458{
2459 static int kmsg_con;
2460
2461 if (new != -1)
2462 return xchg(&kmsg_con, new);
2463 else
2464 return kmsg_con;
2465}
2466
1da177e4
LT		 2467/*
2468 * Console on virtual terminal
2469 *
2470 * The console must be locked when we get here.
2471 */
2472
2473static void vt_console_print(struct console *co, const char *b, unsigned count)
2474{
2475 struct vc_data *vc = vc_cons[fg_console].d;
2476 unsigned char c;
b0940003 2477 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2478 const ushort *start;
2479 ushort cnt = 0;
2480 ushort myx;
5ada918b 2481 int kmsg_console;
1da177e4
LT		 2482
2483 /* console busy or not yet initialized */
b0940003
NP		 2484 if (!printable)
2485 return;
2486 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2487 return;
2488
5ada918b
BW		 2489 kmsg_console = vt_get_kmsg_redirect();
2490 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2491 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2492
2493 /* read `x' only after setting currcons properly (otherwise
2494 the `x' macro will read the x of the foreground console). */
2495 myx = vc->vc_x;
2496
2497 if (!vc_cons_allocated(fg_console)) {
2498 /* impossible */
2499 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2500 goto quit;
2501 }
2502
8fd4bd22 2503 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2504 goto quit;
2505
2506 /* undraw cursor first */
2507 if (IS_FG(vc))
2508 hide_cursor(vc);
2509
2510 start = (ushort *)vc->vc_pos;
2511
2512 /* Contrived structure to try to emulate original need_wrap behaviour
2513 * Problems caused when we have need_wrap set on '\n' character */
2514 while (count--) {
2515 c = *b++;
2516 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2517 if (cnt > 0) {
2518 if (CON_IS_VISIBLE(vc))
2519 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2520 vc->vc_x += cnt;
2521 if (vc->vc_need_wrap)
2522 vc->vc_x--;
2523 cnt = 0;
2524 }
2525 if (c == 8) { /* backspace */
2526 bs(vc);
2527 start = (ushort *)vc->vc_pos;
2528 myx = vc->vc_x;
2529 continue;
2530 }
2531 if (c != 13)
2532 lf(vc);
2533 cr(vc);
2534 start = (ushort *)vc->vc_pos;
2535 myx = vc->vc_x;
2536 if (c == 10 || c == 13)
2537 continue;
2538 }
2539 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2540 notify_write(vc, c);
1da177e4
LT		 2541 cnt++;
2542 if (myx == vc->vc_cols - 1) {
2543 vc->vc_need_wrap = 1;
2544 continue;
2545 }
2546 vc->vc_pos += 2;
2547 myx++;
2548 }
2549 if (cnt > 0) {
2550 if (CON_IS_VISIBLE(vc))
2551 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2552 vc->vc_x += cnt;
2553 if (vc->vc_x == vc->vc_cols) {
2554 vc->vc_x--;
2555 vc->vc_need_wrap = 1;
2556 }
2557 }
2558 set_cursor(vc);
b293d758 2559 notify_update(vc);
1da177e4
LT		 2560
2561quit:
b0940003 2562 spin_unlock(&printing_lock);
1da177e4
LT		 2563}
2564
2565static struct tty_driver *vt_console_device(struct console *c, int *index)
2566{
2567 *index = c->index ? c->index-1 : fg_console;
2568 return console_driver;
2569}
2570
2571static struct console vt_console_driver = {
2572 .name = "tty",
2573 .write = vt_console_print,
2574 .device = vt_console_device,
2575 .unblank = unblank_screen,
2576 .flags = CON_PRINTBUFFER,
2577 .index = -1,
2578};
2579#endif
2580
2581/*
2582 * Handling of Linux-specific VC ioctls
2583 */
2584
2585/*
ac751efa 2586 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2587 *
2588 * There are some functions which don't need it.
2589 *
2590 * There are some functions which can sleep for arbitrary periods
2591 * (paste_selection) but we don't need the lock there anyway.
2592 *
2593 * set_selection has locking, and definitely needs it
2594 */
2595
2596int tioclinux(struct tty_struct *tty, unsigned long arg)
2597{
2598 char type, data;
2599 char __user *p = (char __user *)arg;
2600 int lines;
2601 int ret;
2602
1da177e4
LT		 2603 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2604 return -EPERM;
2605 if (get_user(type, p))
2606 return -EFAULT;
2607 ret = 0;
04f378b1 2608
1da177e4
LT		 2609 switch (type)
2610 {
2611 case TIOCL_SETSEL:
ac751efa 2612 console_lock();
1da177e4 2613 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2614 console_unlock();
1da177e4
LT		 2615 break;
2616 case TIOCL_PASTESEL:
2617 ret = paste_selection(tty);
2618 break;
2619 case TIOCL_UNBLANKSCREEN:
ac751efa 2620 console_lock();
1da177e4 2621 unblank_screen();
ac751efa 2622 console_unlock();
1da177e4
LT		 2623 break;
2624 case TIOCL_SELLOADLUT:
5289475d 2625 console_lock();
1da177e4 2626 ret = sel_loadlut(p);
5289475d 2627 console_unlock();
1da177e4
LT		 2628 break;
2629 case TIOCL_GETSHIFTSTATE:
04f378b1 2630
1da177e4
LT		 2631 /*
2632 * Make it possible to react to Shift+Mousebutton.
2633 * Note that 'shift_state' is an undocumented
2634 * kernel-internal variable; programs not closely
2635 * related to the kernel should not use this.
2636 */
079c9534 2637 data = vt_get_shift_state();
1da177e4
LT		 2638 ret = __put_user(data, p);
2639 break;
2640 case TIOCL_GETMOUSEREPORTING:
20f62579 2641 console_lock(); /* May be overkill */
1da177e4 2642 data = mouse_reporting();
20f62579 2643 console_unlock();
1da177e4
LT		 2644 ret = __put_user(data, p);
2645 break;
2646 case TIOCL_SETVESABLANK:
20f62579 2647 console_lock();
403aac96 2648 ret = set_vesa_blanking(p);
20f62579 2649 console_unlock();
1da177e4 2650 break;
0ca07731 2651 case TIOCL_GETKMSGREDIRECT:
5ada918b 2652 data = vt_get_kmsg_redirect();
0ca07731
RW		 2653 ret = __put_user(data, p);
2654 break;
1da177e4
LT		 2655 case TIOCL_SETKMSGREDIRECT:
2656 if (!capable(CAP_SYS_ADMIN)) {
2657 ret = -EPERM;
2658 } else {
2659 if (get_user(data, p+1))
2660 ret = -EFAULT;
2661 else
5ada918b 2662 vt_kmsg_redirect(data);
1da177e4
LT		 2663 }
2664 break;
2665 case TIOCL_GETFGCONSOLE:
20f62579
AC		 2666 /* No locking needed as this is a transiently
2667 correct return anyway if the caller hasn't
2668 disabled switching */
1da177e4
LT		 2669 ret = fg_console;
2670 break;
2671 case TIOCL_SCROLLCONSOLE:
2672 if (get_user(lines, (s32 __user *)(p+4))) {
2673 ret = -EFAULT;
2674 } else {
20f62579
AC		 2675 /* Need the console lock here. Note that lots
2676 of other calls need fixing before the lock
2677 is actually useful ! */
2678 console_lock();
1da177e4 2679 scrollfront(vc_cons[fg_console].d, lines);
20f62579 2680 console_unlock();
1da177e4
LT		 2681 ret = 0;
2682 }
2683 break;
2684 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2685 console_lock();
1da177e4
LT		 2686 ignore_poke = 1;
2687 do_blank_screen(0);
ac751efa 2688 console_unlock();
1da177e4
LT		 2689 break;
2690 case TIOCL_BLANKEDSCREEN:
2691 ret = console_blanked;
2692 break;
2693 default:
2694 ret = -EINVAL;
2695 break;
2696 }
2697 return ret;
2698}
2699
2700/*
2701 * /dev/ttyN handling
2702 */
2703
2704static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2705{
2706 int retval;
2707
2708 retval = do_con_write(tty, buf, count);
2709 con_flush_chars(tty);
2710
2711 return retval;
2712}
2713
5d19f546 2714static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2715{
2716 if (in_interrupt())
5d19f546
AC		 2717 return 0; /* n_r3964 calls put_char() from interrupt context */
2718 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2719}
2720
2721static int con_write_room(struct tty_struct *tty)
2722{
2723 if (tty->stopped)
2724 return 0;
a88a69c9 2725 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2726}
2727
2728static int con_chars_in_buffer(struct tty_struct *tty)
2729{
2730 return 0; /* we're not buffering */
2731}
2732
2733/*
2734 * con_throttle and con_unthrottle are only used for
2735 * paste_selection(), which has to stuff in a large number of
2736 * characters...
2737 */
2738static void con_throttle(struct tty_struct *tty)
2739{
2740}
2741
2742static void con_unthrottle(struct tty_struct *tty)
2743{
2744 struct vc_data *vc = tty->driver_data;
2745
2746 wake_up_interruptible(&vc->paste_wait);
2747}
2748
2749/*
2750 * Turn the Scroll-Lock LED on when the tty is stopped
2751 */
2752static void con_stop(struct tty_struct *tty)
2753{
2754 int console_num;
2755 if (!tty)
2756 return;
2757 console_num = tty->index;
2758 if (!vc_cons_allocated(console_num))
2759 return;
079c9534 2760 vt_kbd_con_stop(console_num);
1da177e4
LT		 2761}
2762
2763/*
2764 * Turn the Scroll-Lock LED off when the console is started
2765 */
2766static void con_start(struct tty_struct *tty)
2767{
2768 int console_num;
2769 if (!tty)
2770 return;
2771 console_num = tty->index;
2772 if (!vc_cons_allocated(console_num))
2773 return;
079c9534 2774 vt_kbd_con_start(console_num);
1da177e4
LT		 2775}
2776
2777static void con_flush_chars(struct tty_struct *tty)
2778{
2779 struct vc_data *vc;
2780
2781 if (in_interrupt()) /* from flush_to_ldisc */
2782 return;
2783
2784 /* if we race with con_close(), vt may be null */
ac751efa 2785 console_lock();
1da177e4
LT		 2786 vc = tty->driver_data;
2787 if (vc)
2788 set_cursor(vc);
ac751efa 2789 console_unlock();
1da177e4
LT		 2790}
2791
2792/*
2793 * Allocate the console screen memory.
2794 */
2795static int con_open(struct tty_struct *tty, struct file *filp)
2796{
2797 unsigned int currcons = tty->index;
2798 int ret = 0;
2799
ac751efa 2800 console_lock();
f786648b 2801 if (tty->driver_data == NULL) {
1da177e4
LT		 2802 ret = vc_allocate(currcons);
2803 if (ret == 0) {
2804 struct vc_data *vc = vc_cons[currcons].d;
feebed65
AC		 2805
2806 /* Still being freed */
8ce73264 2807 if (vc->port.tty) {
ac751efa 2808 console_unlock();
feebed65
AC		 2809 return -ERESTARTSYS;
2810 }
1da177e4 2811 tty->driver_data = vc;
8ce73264 2812 vc->port.tty = tty;
1da177e4
LT		 2813
2814 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2815 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2816 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2817 }
c1236d31
ST		 2818 if (vc->vc_utf)
2819 tty->termios->c_iflag |= IUTF8;
2820 else
2821 tty->termios->c_iflag &= ~IUTF8;
ac751efa 2822 console_unlock();
1da177e4
LT		 2823 return ret;
2824 }
2825 }
ac751efa 2826 console_unlock();
1da177e4
LT		 2827 return ret;
2828}
2829
1da177e4
LT		 2830static void con_close(struct tty_struct *tty, struct file *filp)
2831{
feebed65
AC		 2832 /* Nothing to do - we defer to shutdown */
2833}
1da177e4 2834
feebed65
AC		 2835static void con_shutdown(struct tty_struct *tty)
2836{
2837 struct vc_data *vc = tty->driver_data;
2838 BUG_ON(vc == NULL);
ac751efa 2839 console_lock();
8ce73264 2840 vc->port.tty = NULL;
ac751efa 2841 console_unlock();
feebed65 2842 tty_shutdown(tty);
1da177e4
LT		 2843}
2844
fa6ce9ab
JE		 2845static int default_italic_color = 2; // green (ASCII)
2846static int default_underline_color = 3; // cyan (ASCII)
2847module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2848module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2849
1da177e4
LT		 2850static void vc_init(struct vc_data *vc, unsigned int rows,
2851 unsigned int cols, int do_clear)
2852{
2853 int j, k ;
2854
2855 vc->vc_cols = cols;
2856 vc->vc_rows = rows;
2857 vc->vc_size_row = cols << 1;
2858 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2859
2860 set_origin(vc);
2861 vc->vc_pos = vc->vc_origin;
2862 reset_vc(vc);
2863 for (j=k=0; j<16; j++) {
2864 vc->vc_palette[k++] = default_red[j] ;
2865 vc->vc_palette[k++] = default_grn[j] ;
2866 vc->vc_palette[k++] = default_blu[j] ;
2867 }
2868 vc->vc_def_color = 0x07; /* white */
fa6ce9ab
JE		 2869 vc->vc_ulcolor = default_underline_color;
2870 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2871 vc->vc_halfcolor = 0x08; /* grey */
2872 init_waitqueue_head(&vc->paste_wait);
2873 reset_terminal(vc, do_clear);
2874}
2875
2876/*
2877 * This routine initializes console interrupts, and does nothing
2878 * else. If you want the screen to clear, call tty_write with
2879 * the appropriate escape-sequence.
2880 */
2881
2882static int __init con_init(void)
2883{
2884 const char *display_desc = NULL;
2885 struct vc_data *vc;
3e795de7 2886 unsigned int currcons = 0, i;
1da177e4 2887
ac751efa 2888 console_lock();
1da177e4
LT		 2889
2890 if (conswitchp)
2891 display_desc = conswitchp->con_startup();
2892 if (!display_desc) {
2893 fg_console = 0;
ac751efa 2894 console_unlock();
1da177e4
LT		 2895 return 0;
2896 }
2897
3e795de7
AD		 2898 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2899 struct con_driver *con_driver = &registered_con_driver[i];
2900
2901 if (con_driver->con == NULL) {
2902 con_driver->con = conswitchp;
2903 con_driver->desc = display_desc;
2904 con_driver->flag = CON_DRIVER_FLAG_INIT;
2905 con_driver->first = 0;
2906 con_driver->last = MAX_NR_CONSOLES - 1;
2907 break;
2908 }
2909 }
2910
2911 for (i = 0; i < MAX_NR_CONSOLES; i++)
2912 con_driver_map[i] = conswitchp;
2913
1da177e4
LT		 2914 if (blankinterval) {
2915 blank_state = blank_normal_wait;
f324edc8 2916 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2917 }
2918
1da177e4 2919 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2920 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2921 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 2922 tty_port_init(&vc->port);
1da177e4 2923 visual_init(vc, currcons, 1);
a5f4f52e 2924 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 2925 vc_init(vc, vc->vc_rows, vc->vc_cols,
2926 currcons || !vc->vc_sw->con_save_screen);
2927 }
2928 currcons = fg_console = 0;
2929 master_display_fg = vc = vc_cons[currcons].d;
2930 set_origin(vc);
2931 save_screen(vc);
2932 gotoxy(vc, vc->vc_x, vc->vc_y);
2933 csi_J(vc, 0);
2934 update_screen(vc);
1ffdda95 2935 pr_info("Console: %s %s %dx%d",
1da177e4
LT		 2936 vc->vc_can_do_color ? "colour" : "mono",
2937 display_desc, vc->vc_cols, vc->vc_rows);
2938 printable = 1;
2939 printk("\n");
2940
ac751efa 2941 console_unlock();
1da177e4
LT		 2942
2943#ifdef CONFIG_VT_CONSOLE
2944 register_console(&vt_console_driver);
2945#endif
2946 return 0;
2947}
2948console_initcall(con_init);
2949
b68e31d0 2950static const struct tty_operations con_ops = {
1da177e4
LT		 2951 .open = con_open,
2952 .close = con_close,
2953 .write = con_write,
2954 .write_room = con_write_room,
2955 .put_char = con_put_char,
2956 .flush_chars = con_flush_chars,
2957 .chars_in_buffer = con_chars_in_buffer,
2958 .ioctl = vt_ioctl,
e9216651
AB		 2959#ifdef CONFIG_COMPAT
2960 .compat_ioctl = vt_compat_ioctl,
2961#endif
1da177e4
LT		 2962 .stop = con_stop,
2963 .start = con_start,
2964 .throttle = con_throttle,
2965 .unthrottle = con_unthrottle,
8c9a9dd0 2966 .resize = vt_resize,
feebed65 2967 .shutdown = con_shutdown
1da177e4
LT		 2968};
2969
d81ed103
AC		 2970static struct cdev vc0_cdev;
2971
fbc92a34
KS		 2972static ssize_t show_tty_active(struct device *dev,
2973 struct device_attribute *attr, char *buf)
2974{
2975 return sprintf(buf, "tty%d\n", fg_console + 1);
2976}
2977static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2978
d81ed103 2979int __init vty_init(const struct file_operations *console_fops)
1da177e4 2980{
d81ed103
AC		 2981 cdev_init(&vc0_cdev, console_fops);
2982 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2983 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2984 panic("Couldn't register /dev/tty0 driver\n");
fbc92a34
KS		 2985 tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2986 if (IS_ERR(tty0dev))
2987 tty0dev = NULL;
2988 else
a2a6a822 2989 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
d81ed103 2990
1da177e4
LT		 2991 vcs_init();
2992
2993 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2994 if (!console_driver)
2995 panic("Couldn't allocate console driver\n");
2f16669d 2996
1da177e4
LT		 2997 console_driver->name = "tty";
2998 console_driver->name_base = 1;
2999 console_driver->major = TTY_MAJOR;
3000 console_driver->minor_start = 1;
3001 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3002 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3003 if (default_utf8)
3004 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3005 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3006 tty_set_operations(console_driver, &con_ops);
3007 if (tty_register_driver(console_driver))
3008 panic("Couldn't register console driver\n");
1da177e4
LT		 3009 kbd_init();
3010 console_map_init();
1da177e4
LT		 3011#ifdef CONFIG_MDA_CONSOLE
3012 mda_console_init();
3013#endif
3014 return 0;
3015}
3016
3017#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3018
3019static struct class *vtconsole_class;
3020
b7269dd2
JB		 3021static int bind_con_driver(const struct consw *csw, int first, int last,
3022 int deflt)
1da177e4 3023{
3e795de7
AD		 3024 struct module *owner = csw->owner;
3025 const char *desc = NULL;
3026 struct con_driver *con_driver;
3027 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3028
1da177e4
LT		 3029 if (!try_module_get(owner))
3030 return -ENODEV;
3031
ac751efa 3032 console_lock();
1c8ce271 3033
3e795de7
AD		 3034 /* check if driver is registered */
3035 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3036 con_driver = &registered_con_driver[i];
3037
3038 if (con_driver->con == csw) {
3039 desc = con_driver->desc;
3040 retval = 0;
3041 break;
3042 }
3043 }
3044
3045 if (retval)
3046 goto err;
3047
3048 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3049 csw->con_startup();
3050 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3051 }
1c8ce271 3052
1da177e4
LT		 3053 if (deflt) {
3054 if (conswitchp)
3055 module_put(conswitchp->owner);
1c8ce271 3056
1da177e4
LT		 3057 __module_get(owner);
3058 conswitchp = csw;
3059 }
3060
3e795de7
AD		 3061 first = max(first, con_driver->first);
3062 last = min(last, con_driver->last);
3063
1da177e4
LT		 3064 for (i = first; i <= last; i++) {
3065 int old_was_color;
3066 struct vc_data *vc = vc_cons[i].d;
3067
3068 if (con_driver_map[i])
3069 module_put(con_driver_map[i]->owner);
3070 __module_get(owner);
3071 con_driver_map[i] = csw;
3072
3073 if (!vc || !vc->vc_sw)
3074 continue;
3075
3076 j = i;
1c8ce271 3077
4ee1acce
DH		 3078 if (CON_IS_VISIBLE(vc)) {
3079 k = i;
1da177e4 3080 save_screen(vc);
4ee1acce
DH		 3081 }
3082
1da177e4
LT		 3083 old_was_color = vc->vc_can_do_color;
3084 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3085 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3086 visual_init(vc, i, 0);
1c8ce271 3087 set_origin(vc);
1da177e4
LT		 3088 update_attr(vc);
3089
3090 /* If the console changed between mono <-> color, then
3091 * the attributes in the screenbuf will be wrong. The
3092 * following resets all attributes to something sane.
3093 */
3094 if (old_was_color != vc->vc_can_do_color)
3095 clear_buffer_attributes(vc);
1da177e4 3096 }
4ee1acce 3097
1ffdda95 3098 pr_info("Console: switching ");
1da177e4
LT		 3099 if (!deflt)
3100 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3101 if (j >= 0) {
3102 struct vc_data *vc = vc_cons[j].d;
3103
1da177e4 3104 printk("to %s %s %dx%d\n",
4ee1acce
DH		 3105 vc->vc_can_do_color ? "colour" : "mono",
3106 desc, vc->vc_cols, vc->vc_rows);
3107
3108 if (k >= 0) {
3109 vc = vc_cons[k].d;
3110 update_screen(vc);
3111 }
3112 } else
1da177e4
LT		 3113 printk("to %s\n", desc);
3114
3e795de7
AD		 3115 retval = 0;
3116err:
ac751efa 3117 console_unlock();
1da177e4 3118 module_put(owner);
3e795de7
AD		 3119 return retval;
3120};
1da177e4 3121
13ae6645
AD		 3122#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3123static int con_is_graphics(const struct consw *csw, int first, int last)
3124{
3125 int i, retval = 0;
3126
3127 for (i = first; i <= last; i++) {
3128 struct vc_data *vc = vc_cons[i].d;
3129
3130 if (vc && vc->vc_mode == KD_GRAPHICS) {
3131 retval = 1;
3132 break;
3133 }
3134 }
3135
3136 return retval;
3137}
3138
b7269dd2
JB		 3139/**
3140 * unbind_con_driver - unbind a console driver
3141 * @csw: pointer to console driver to unregister
3142 * @first: first in range of consoles that @csw should be unbound from
3143 * @last: last in range of consoles that @csw should be unbound from
3144 * @deflt: should next bound console driver be default after @csw is unbound?
3145 *
3146 * To unbind a driver from all possible consoles, pass 0 as @first and
3147 * %MAX_NR_CONSOLES as @last.
3148 *
3149 * @deflt controls whether the console that ends up replacing @csw should be
3150 * the default console.
3151 *
3152 * RETURNS:
3153 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3154 * or 0 on success.
3155 */
623e71b0 3156int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3157{
3e795de7
AD		 3158 struct module *owner = csw->owner;
3159 const struct consw *defcsw = NULL;
3160 struct con_driver *con_driver = NULL, *con_back = NULL;
3161 int i, retval = -ENODEV;
1da177e4 3162
3e795de7
AD		 3163 if (!try_module_get(owner))
3164 return -ENODEV;
3165
ac751efa 3166 console_lock();
3e795de7
AD		 3167
3168 /* check if driver is registered and if it is unbindable */
3169 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3170 con_driver = &registered_con_driver[i];
3171
3172 if (con_driver->con == csw &&
6db4063c 3173 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3174 retval = 0;
3175 break;
3176 }
3177 }
3178
3179 if (retval) {
ac751efa 3180 console_unlock();
3e795de7
AD		 3181 goto err;
3182 }
3183
6db4063c
AD		 3184 retval = -ENODEV;
3185
3e795de7
AD		 3186 /* check if backup driver exists */
3187 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3188 con_back = &registered_con_driver[i];
3189
3190 if (con_back->con &&
6db4063c 3191 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3e795de7
AD		 3192 defcsw = con_back->con;
3193 retval = 0;
3194 break;
3195 }
3196 }
3197
3198 if (retval) {
ac751efa 3199 console_unlock();
3e795de7
AD		 3200 goto err;
3201 }
3202
3203 if (!con_is_bound(csw)) {
ac751efa 3204 console_unlock();
3e795de7
AD		 3205 goto err;
3206 }
3207
3208 first = max(first, con_driver->first);
3209 last = min(last, con_driver->last);
3210
3211 for (i = first; i <= last; i++) {
1da177e4
LT		 3212 if (con_driver_map[i] == csw) {
3213 module_put(csw->owner);
3214 con_driver_map[i] = NULL;
3215 }
3e795de7
AD		 3216 }
3217
3218 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3219 const struct consw *defconsw = conswitchp;
3220
3e795de7
AD		 3221 defcsw->con_startup();
3222 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3223 /*
3224 * vgacon may change the default driver to point
3225 * to dummycon, we restore it here...
3226 */
3227 conswitchp = defconsw;
3e795de7
AD		 3228 }
3229
3230 if (!con_is_bound(csw))
3231 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3232
ac751efa 3233 console_unlock();
6db4063c
AD		 3234 /* ignore return value, binding should not fail */
3235 bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3236err:
3237 module_put(owner);
3238 return retval;
3239
3240}
623e71b0 3241EXPORT_SYMBOL(unbind_con_driver);
3e795de7 3242
6db4063c
AD		 3243static int vt_bind(struct con_driver *con)
3244{
3245 const struct consw *defcsw = NULL, *csw = NULL;
3246 int i, more = 1, first = -1, last = -1, deflt = 0;
3247
3248 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3249 con_is_graphics(con->con, con->first, con->last))
3250 goto err;
3251
3252 csw = con->con;
3253
3254 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3255 struct con_driver *con = &registered_con_driver[i];
3256
3257 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3258 defcsw = con->con;
3259 break;
3260 }
3261 }
3262
3263 if (!defcsw)
3264 goto err;
3265
3266 while (more) {
3267 more = 0;
3268
3269 for (i = con->first; i <= con->last; i++) {
3270 if (con_driver_map[i] == defcsw) {
3271 if (first == -1)
3272 first = i;
3273 last = i;
3274 more = 1;
3275 } else if (first != -1)
3276 break;
3277 }
3278
3279 if (first == 0 && last == MAX_NR_CONSOLES -1)
3280 deflt = 1;
3281
3282 if (first != -1)
3283 bind_con_driver(csw, first, last, deflt);
3284
3285 first = -1;
3286 last = -1;
3287 deflt = 0;
3288 }
3289
3290err:
3291 return 0;
3292}
3293
3294static int vt_unbind(struct con_driver *con)
3295{
3296 const struct consw *csw = NULL;
3297 int i, more = 1, first = -1, last = -1, deflt = 0;
3298
3299 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3300 con_is_graphics(con->con, con->first, con->last))
3301 goto err;
3302
3303 csw = con->con;
3304
3305 while (more) {
3306 more = 0;
3307
3308 for (i = con->first; i <= con->last; i++) {
3309 if (con_driver_map[i] == csw) {
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
3321 if (first != -1)
3322 unbind_con_driver(csw, first, last, deflt);
3323
3324 first = -1;
3325 last = -1;
3326 deflt = 0;
3327 }
3328
3329err:
3330 return 0;
3331}
13ae6645
AD		 3332#else
3333static inline int vt_bind(struct con_driver *con)
3334{
3335 return 0;
3336}
3337static inline int vt_unbind(struct con_driver *con)
3338{
3339 return 0;
3340}
3341#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3342
805952a8 3343static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3344 const char *buf, size_t count)
3345{
805952a8 3346 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3347 int bind = simple_strtoul(buf, NULL, 0);
3348
3349 if (bind)
3350 vt_bind(con);
3351 else
3352 vt_unbind(con);
3353
3354 return count;
3355}
3356
805952a8
GKH		 3357static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3358 char *buf)
6db4063c 3359{
805952a8 3360 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3361 int bind = con_is_bound(con->con);
3362
3363 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3364}
3365
805952a8
GKH		 3366static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3367 char *buf)
6db4063c 3368{
805952a8 3369 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3370
3371 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3372 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3373 con->desc);
3374
3375}
3376
805952a8 3377static struct device_attribute device_attrs[] = {
6db4063c
AD		 3378 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3379 __ATTR(name, S_IRUGO, show_name, NULL),
3380};
3381
805952a8 3382static int vtconsole_init_device(struct con_driver *con)
6db4063c
AD		 3383{
3384 int i;
928e964f 3385 int error = 0;
6db4063c 3386
928e964f 3387 con->flag |= CON_DRIVER_FLAG_ATTR;
805952a8
GKH		 3388 dev_set_drvdata(con->dev, con);
3389 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3390 error = device_create_file(con->dev, &device_attrs[i]);
928e964f
AD		 3391 if (error)
3392 break;
3393 }
6db4063c 3394
928e964f
AD		 3395 if (error) {
3396 while (--i >= 0)
805952a8 3397 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3398 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3399 }
3400
3401 return error;
6db4063c
AD		 3402}
3403
805952a8 3404static void vtconsole_deinit_device(struct con_driver *con)
6db4063c
AD		 3405{
3406 int i;
3407
928e964f 3408 if (con->flag & CON_DRIVER_FLAG_ATTR) {
805952a8
GKH		 3409 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3410 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3411 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3412 }
6db4063c
AD		 3413}
3414
3e795de7
AD		 3415/**
3416 * con_is_bound - checks if driver is bound to the console
3417 * @csw: console driver
3418 *
3419 * RETURNS: zero if unbound, nonzero if bound
3420 *
3421 * Drivers can call this and if zero, they should release
3422 * all resources allocated on con_startup()
3423 */
3424int con_is_bound(const struct consw *csw)
3425{
3426 int i, bound = 0;
3427
3428 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3429 if (con_driver_map[i] == csw) {
3430 bound = 1;
3431 break;
3432 }
3433 }
3434
3435 return bound;
3436}
3437EXPORT_SYMBOL(con_is_bound);
3438
b45cfba4
JB		 3439/**
3440 * con_debug_enter - prepare the console for the kernel debugger
3441 * @sw: console driver
3442 *
3443 * Called when the console is taken over by the kernel debugger, this
3444 * function needs to save the current console state, then put the console
3445 * into a state suitable for the kernel debugger.
3446 *
3447 * RETURNS:
3448 * Zero on success, nonzero if a failure occurred when trying to prepare
3449 * the console for the debugger.
3450 */
3451int con_debug_enter(struct vc_data *vc)
3452{
3453 int ret = 0;
3454
3455 saved_fg_console = fg_console;
3456 saved_last_console = last_console;
3457 saved_want_console = want_console;
3458 saved_vc_mode = vc->vc_mode;
beed5336 3459 saved_console_blanked = console_blanked;
b45cfba4
JB		 3460 vc->vc_mode = KD_TEXT;
3461 console_blanked = 0;
3462 if (vc->vc_sw->con_debug_enter)
3463 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3464#ifdef CONFIG_KGDB_KDB
3465 /* Set the initial LINES variable if it is not already set */
3466 if (vc->vc_rows < 999) {
3467 int linecount;
3468 char lns[4];
3469 const char *setargs[3] = {
3470 "set",
3471 "LINES",
3472 lns,
3473 };
3474 if (kdbgetintenv(setargs[0], &linecount)) {
3475 snprintf(lns, 4, "%i", vc->vc_rows);
3476 kdb_set(2, setargs);
3477 }
3478 }
3479#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3480 return ret;
3481}
3482EXPORT_SYMBOL_GPL(con_debug_enter);
3483
3484/**
3485 * con_debug_leave - restore console state
3486 * @sw: console driver
3487 *
3488 * Restore the console state to what it was before the kernel debugger
3489 * was invoked.
3490 *
3491 * RETURNS:
3492 * Zero on success, nonzero if a failure occurred when trying to restore
3493 * the console.
3494 */
3495int con_debug_leave(void)
3496{
3497 struct vc_data *vc;
3498 int ret = 0;
3499
3500 fg_console = saved_fg_console;
3501 last_console = saved_last_console;
3502 want_console = saved_want_console;
beed5336 3503 console_blanked = saved_console_blanked;
b45cfba4
JB		 3504 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3505
3506 vc = vc_cons[fg_console].d;
3507 if (vc->vc_sw->con_debug_leave)
3508 ret = vc->vc_sw->con_debug_leave(vc);
3509 return ret;
3510}
3511EXPORT_SYMBOL_GPL(con_debug_leave);
3512
3e795de7
AD		 3513/**
3514 * register_con_driver - register console driver to console layer
3515 * @csw: console driver
3516 * @first: the first console to take over, minimum value is 0
3517 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3518 *
3519 * DESCRIPTION: This function registers a console driver which can later
3520 * bind to a range of consoles specified by @first and @last. It will
3521 * also initialize the console driver by calling con_startup().
3522 */
3523int register_con_driver(const struct consw *csw, int first, int last)
3524{
3525 struct module *owner = csw->owner;
3526 struct con_driver *con_driver;
3527 const char *desc;
3528 int i, retval = 0;
3529
3530 if (!try_module_get(owner))
3531 return -ENODEV;
3532
ac751efa 3533 console_lock();
3e795de7
AD		 3534
3535 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3536 con_driver = &registered_con_driver[i];
3537
3538 /* already registered */
3539 if (con_driver->con == csw)
c55c63c6 3540 retval = -EBUSY;
3e795de7
AD		 3541 }
3542
3543 if (retval)
3544 goto err;
3545
3546 desc = csw->con_startup();
3547
3548 if (!desc)
3549 goto err;
3550
3551 retval = -EINVAL;
3552
3553 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3554 con_driver = &registered_con_driver[i];
3555
3556 if (con_driver->con == NULL) {
3557 con_driver->con = csw;
3558 con_driver->desc = desc;
6db4063c
AD		 3559 con_driver->node = i;
3560 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3561 CON_DRIVER_FLAG_INIT;
3562 con_driver->first = first;
3563 con_driver->last = last;
3564 retval = 0;
3565 break;
3566 }
3567 }
3568
6db4063c
AD		 3569 if (retval)
3570 goto err;
3571
d81ed103 3572 con_driver->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3573 MKDEV(0, con_driver->node),
3574 NULL, "vtcon%i",
3575 con_driver->node);
6db4063c 3576
805952a8
GKH		 3577 if (IS_ERR(con_driver->dev)) {
3578 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3579 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3580 PTR_ERR(con_driver->dev));
3581 con_driver->dev = NULL;
6db4063c 3582 } else {
805952a8 3583 vtconsole_init_device(con_driver);
6db4063c 3584 }
928e964f 3585
3e795de7 3586err:
ac751efa 3587 console_unlock();
3e795de7
AD		 3588 module_put(owner);
3589 return retval;
3590}
3591EXPORT_SYMBOL(register_con_driver);
3592
3593/**
3594 * unregister_con_driver - unregister console driver from console layer
3595 * @csw: console driver
3596 *
3597 * DESCRIPTION: All drivers that registers to the console layer must
3598 * call this function upon exit, or if the console driver is in a state
3599 * where it won't be able to handle console services, such as the
3600 * framebuffer console without loaded framebuffer drivers.
3601 *
3602 * The driver must unbind first prior to unregistration.
3603 */
3604int unregister_con_driver(const struct consw *csw)
3605{
3606 int i, retval = -ENODEV;
3607
ac751efa 3608 console_lock();
3e795de7
AD		 3609
3610 /* cannot unregister a bound driver */
3611 if (con_is_bound(csw))
3612 goto err;
3613
3614 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3615 struct con_driver *con_driver = &registered_con_driver[i];
3616
3617 if (con_driver->con == csw &&
6db4063c 3618 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
805952a8
GKH		 3619 vtconsole_deinit_device(con_driver);
3620 device_destroy(vtconsole_class,
3621 MKDEV(0, con_driver->node));
3e795de7
AD		 3622 con_driver->con = NULL;
3623 con_driver->desc = NULL;
805952a8 3624 con_driver->dev = NULL;
6db4063c 3625 con_driver->node = 0;
3e795de7
AD		 3626 con_driver->flag = 0;
3627 con_driver->first = 0;
3628 con_driver->last = 0;
3629 retval = 0;
3630 break;
3631 }
3632 }
3e795de7 3633err:
ac751efa 3634 console_unlock();
3e795de7
AD		 3635 return retval;
3636}
3637EXPORT_SYMBOL(unregister_con_driver);
3638
3639/*
3640 * If we support more console drivers, this function is used
3641 * when a driver wants to take over some existing consoles
3642 * and become default driver for newly opened ones.
3643 *
3644 * take_over_console is basically a register followed by unbind
3645 */
3646int take_over_console(const struct consw *csw, int first, int last, int deflt)
3647{
3648 int err;
3649
3650 err = register_con_driver(csw, first, last);
c55c63c6
DA		 3651 /* if we get an busy error we still want to bind the console driver
3652 * and return success, as we may have unbound the console driver
3653  * but not unregistered it.
3654 */
3655 if (err == -EBUSY)
3656 err = 0;
3e795de7 3657 if (!err)
6db4063c 3658 bind_con_driver(csw, first, last, deflt);
3e795de7
AD		 3659
3660 return err;
3661}
3662
3663/*
3664 * give_up_console is a wrapper to unregister_con_driver. It will only
3665 * work if driver is fully unbound.
3666 */
3667void give_up_console(const struct consw *csw)
3668{
3669 unregister_con_driver(csw);
3670}
3671
6db4063c 3672static int __init vtconsole_class_init(void)
3e795de7 3673{
6db4063c 3674 int i;
3e795de7 3675
6db4063c
AD		 3676 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3677 if (IS_ERR(vtconsole_class)) {
3678 printk(KERN_WARNING "Unable to create vt console class; "
3679 "errno = %ld\n", PTR_ERR(vtconsole_class));
3680 vtconsole_class = NULL;
3681 }
3e795de7 3682
6db4063c 3683 /* Add system drivers to sysfs */
3e795de7
AD		 3684 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3685 struct con_driver *con = &registered_con_driver[i];
3686
805952a8 3687 if (con->con && !con->dev) {
d81ed103 3688 con->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3689 MKDEV(0, con->node),
3690 NULL, "vtcon%i",
3691 con->node);
6db4063c 3692
805952a8 3693 if (IS_ERR(con->dev)) {
6db4063c 3694 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3695 "device for %s; errno = %ld\n",
3696 con->desc, PTR_ERR(con->dev));
3697 con->dev = NULL;
6db4063c 3698 } else {
805952a8 3699 vtconsole_init_device(con);
6db4063c 3700 }
3e795de7 3701 }
3e795de7
AD		 3702 }
3703
3e795de7
AD		 3704 return 0;
3705}
6db4063c 3706postcore_initcall(vtconsole_class_init);
3e795de7 3707
1da177e4
LT		 3708#endif
3709
3710/*
3711 * Screen blanking
3712 */
3713
403aac96 3714static int set_vesa_blanking(char __user *p)
1da177e4 3715{
403aac96
YY		 3716 unsigned int mode;
3717
3718 if (get_user(mode, p + 1))
3719 return -EFAULT;
3720
3721 vesa_blank_mode = (mode < 4) ? mode : 0;
3722 return 0;
1da177e4
LT		 3723}
3724
1da177e4
LT		 3725void do_blank_screen(int entering_gfx)
3726{
3727 struct vc_data *vc = vc_cons[fg_console].d;
3728 int i;
3729
3730 WARN_CONSOLE_UNLOCKED();
3731
3732 if (console_blanked) {
3733 if (blank_state == blank_vesa_wait) {
3734 blank_state = blank_off;
d060a321 3735 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3736 }
3737 return;
3738 }
1da177e4
LT		 3739
3740 /* entering graphics mode? */
3741 if (entering_gfx) {
3742 hide_cursor(vc);
3743 save_screen(vc);
3744 vc->vc_sw->con_blank(vc, -1, 1);
3745 console_blanked = fg_console + 1;
b6e8f00f 3746 blank_state = blank_off;
1da177e4
LT		 3747 set_origin(vc);
3748 return;
3749 }
3750
b6e8f00f 3751 if (blank_state != blank_normal_wait)
3752 return;
3753 blank_state = blank_off;
3754
1da177e4
LT		 3755 /* don't blank graphics */
3756 if (vc->vc_mode != KD_TEXT) {
3757 console_blanked = fg_console + 1;
3758 return;
3759 }
3760
3761 hide_cursor(vc);
3762 del_timer_sync(&console_timer);
3763 blank_timer_expired = 0;
3764
3765 save_screen(vc);
3766 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3767 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3768 console_blanked = fg_console + 1;
3769 if (i)
3770 set_origin(vc);
3771
3772 if (console_blank_hook && console_blank_hook(1))
3773 return;
3774
d060a321 3775 if (vesa_off_interval && vesa_blank_mode) {
030babac 3776 blank_state = blank_vesa_wait;
1da177e4
LT		 3777 mod_timer(&console_timer, jiffies + vesa_off_interval);
3778 }
8b92e87d 3779 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3780}
3781EXPORT_SYMBOL(do_blank_screen);
3782
3783/*
3784 * Called by timer as well as from vt_console_driver
3785 */
3786void do_unblank_screen(int leaving_gfx)
3787{
3788 struct vc_data *vc;
3789
3790 /* This should now always be called from a "sane" (read: can schedule)
3791 * context for the sake of the low level drivers, except in the special
3792 * case of oops_in_progress
3793 */
3794 if (!oops_in_progress)
3795 might_sleep();
3796
3797 WARN_CONSOLE_UNLOCKED();
3798
3799 ignore_poke = 0;
3800 if (!console_blanked)
3801 return;
3802 if (!vc_cons_allocated(fg_console)) {
3803 /* impossible */
1ffdda95
MSB		 3804 pr_warning("unblank_screen: tty %d not allocated ??\n",
3805 fg_console+1);
1da177e4
LT		 3806 return;
3807 }
3808 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3809 /* Try to unblank in oops case too */
3810 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3811 return; /* but leave console_blanked != 0 */
3812
3813 if (blankinterval) {
f324edc8 3814 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3815 blank_state = blank_normal_wait;
3816 }
3817
3818 console_blanked = 0;
8fd4bd22 3819 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3820 /* Low-level driver cannot restore -> do it ourselves */
3821 update_screen(vc);
3822 if (console_blank_hook)
3823 console_blank_hook(0);
3824 set_palette(vc);
3825 set_cursor(vc);
8b92e87d 3826 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3827}
3828EXPORT_SYMBOL(do_unblank_screen);
3829
3830/*
3831 * This is called by the outside world to cause a forced unblank, mostly for
3832 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3833 * call it with 1 as an argument and so force a mode restore... that may kill
3834 * X or at least garbage the screen but would also make the Oops visible...
3835 */
3836void unblank_screen(void)
3837{
3838 do_unblank_screen(0);
3839}
3840
3841/*
70522e12 3842 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3843 * (console operations can still happen at irq time, but only from printk which
70522e12 3844 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3845 */
3846static void blank_screen_t(unsigned long dummy)
3847{
cc63b1e1 3848 if (unlikely(!keventd_up())) {
f324edc8 3849 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3850 return;
3851 }
1da177e4
LT		 3852 blank_timer_expired = 1;
3853 schedule_work(&console_work);
3854}
3855
3856void poke_blanked_console(void)
3857{
3858 WARN_CONSOLE_UNLOCKED();
3859
3860 /* Add this so we quickly catch whoever might call us in a non
3861 * safe context. Nowadays, unblank_screen() isn't to be called in
3862 * atomic contexts and is allowed to schedule (with the special case
3863 * of oops_in_progress, but that isn't of any concern for this
3864 * function. --BenH.
3865 */
3866 might_sleep();
3867
3868 /* This isn't perfectly race free, but a race here would be mostly harmless,
3869 * at worse, we'll do a spurrious blank and it's unlikely
3870 */
3871 del_timer(&console_timer);
3872 blank_timer_expired = 0;
3873
3874 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3875 return;
3876 if (console_blanked)
3877 unblank_screen();
3878 else if (blankinterval) {
f324edc8 3879 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3880 blank_state = blank_normal_wait;
3881 }
3882}
3883
3884/*
3885 * Palettes
3886 */
3887
3888static void set_palette(struct vc_data *vc)
3889{
3890 WARN_CONSOLE_UNLOCKED();
3891
3892 if (vc->vc_mode != KD_GRAPHICS)
3893 vc->vc_sw->con_set_palette(vc, color_table);
3894}
3895
3896static int set_get_cmap(unsigned char __user *arg, int set)
3897{
3898 int i, j, k;
3899
3900 WARN_CONSOLE_UNLOCKED();
3901
3902 for (i = 0; i < 16; i++)
3903 if (set) {
3904 get_user(default_red[i], arg++);
3905 get_user(default_grn[i], arg++);
3906 get_user(default_blu[i], arg++);
3907 } else {
3908 put_user(default_red[i], arg++);
3909 put_user(default_grn[i], arg++);
3910 put_user(default_blu[i], arg++);
3911 }
3912 if (set) {
3913 for (i = 0; i < MAX_NR_CONSOLES; i++)
3914 if (vc_cons_allocated(i)) {
3915 for (j = k = 0; j < 16; j++) {
3916 vc_cons[i].d->vc_palette[k++] = default_red[j];
3917 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3918 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3919 }
3920 set_palette(vc_cons[i].d);
3921 }
3922 }
3923 return 0;
3924}
3925
3926/*
3927 * Load palette into the DAC registers. arg points to a colour
3928 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3929 */
3930
3931int con_set_cmap(unsigned char __user *arg)
3932{
3933 int rc;
3934
ac751efa 3935 console_lock();
1da177e4 3936 rc = set_get_cmap (arg,1);
ac751efa 3937 console_unlock();
1da177e4
LT		 3938
3939 return rc;
3940}
3941
3942int con_get_cmap(unsigned char __user *arg)
3943{
3944 int rc;
3945
ac751efa 3946 console_lock();
1da177e4 3947 rc = set_get_cmap (arg,0);
ac751efa 3948 console_unlock();
1da177e4
LT		 3949
3950 return rc;
3951}
3952
3953void reset_palette(struct vc_data *vc)
3954{
3955 int j, k;
3956 for (j=k=0; j<16; j++) {
3957 vc->vc_palette[k++] = default_red[j];
3958 vc->vc_palette[k++] = default_grn[j];
3959 vc->vc_palette[k++] = default_blu[j];
3960 }
3961 set_palette(vc);
3962}
3963
3964/*
3965 * Font switching
3966 *
3967 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3968 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3969 * depending on width) reserved for each character which is kinda wasty, but
3970 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 3971 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 3972 * format (maybe we should add a `fontoffset' field to the `display'
3973 * structure so we won't have to convert the fontdata all the time.
3974 * /Jes
3975 */
3976
3977#define max_font_size 65536
3978
3979static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3980{
3981 struct console_font font;
3982 int rc = -EINVAL;
3983 int c;
3984
1da177e4
LT		 3985 if (op->data) {
3986 font.data = kmalloc(max_font_size, GFP_KERNEL);
3987 if (!font.data)
3988 return -ENOMEM;
3989 } else
3990 font.data = NULL;
3991
ac751efa 3992 console_lock();
edab558f
AC		 3993 if (vc->vc_mode != KD_TEXT)
3994 rc = -EINVAL;
3995 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 3996 rc = vc->vc_sw->con_font_get(vc, &font);
3997 else
3998 rc = -ENOSYS;
ac751efa 3999 console_unlock();
1da177e4
LT		 4000
4001 if (rc)
4002 goto out;
4003
4004 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4005
1da177e4
LT		 4006 if (op->data && font.charcount > op->charcount)
4007 rc = -ENOSPC;
4008 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4009 if (font.width > op->width || font.height > op->height)
4010 rc = -ENOSPC;
4011 } else {
4012 if (font.width != 8)
4013 rc = -EIO;
4014 else if ((op->height && font.height > op->height) ||
4015 font.height > 32)
4016 rc = -ENOSPC;
4017 }
4018 if (rc)
4019 goto out;
4020
4021 op->height = font.height;
4022 op->width = font.width;
4023 op->charcount = font.charcount;
4024
4025 if (op->data && copy_to_user(op->data, font.data, c))
4026 rc = -EFAULT;
4027
4028out:
4029 kfree(font.data);
4030 return rc;
4031}
4032
4033static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4034{
4035 struct console_font font;
4036 int rc = -EINVAL;
4037 int size;
4038
4039 if (vc->vc_mode != KD_TEXT)
4040 return -EINVAL;
4041 if (!op->data)
4042 return -EINVAL;
4043 if (op->charcount > 512)
4044 return -EINVAL;
4045 if (!op->height) { /* Need to guess font height [compat] */
4046 int h, i;
4047 u8 __user *charmap = op->data;
4048 u8 tmp;
4049
4050 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4051 so that we can get rid of this soon */
4052 if (!(op->flags & KD_FONT_FLAG_OLD))
4053 return -EINVAL;
4054 for (h = 32; h > 0; h--)
4055 for (i = 0; i < op->charcount; i++) {
4056 if (get_user(tmp, &charmap[32*i+h-1]))
4057 return -EFAULT;
4058 if (tmp)
4059 goto nonzero;
4060 }
4061 return -EINVAL;
4062 nonzero:
4063 op->height = h;
4064 }
4065 if (op->width <= 0 || op->width > 32 || op->height > 32)
4066 return -EINVAL;
4067 size = (op->width+7)/8 * 32 * op->charcount;
4068 if (size > max_font_size)
4069 return -ENOSPC;
4070 font.charcount = op->charcount;
4071 font.height = op->height;
4072 font.width = op->width;
9b71ca20
JL		 4073 font.data = memdup_user(op->data, size);
4074 if (IS_ERR(font.data))
4075 return PTR_ERR(font.data);
ac751efa 4076 console_lock();
edab558f
AC		 4077 if (vc->vc_mode != KD_TEXT)
4078 rc = -EINVAL;
4079 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4080 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4081 else
4082 rc = -ENOSYS;
ac751efa 4083 console_unlock();
1da177e4
LT		 4084 kfree(font.data);
4085 return rc;
4086}
4087
4088static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4089{
4090 struct console_font font = {.width = op->width, .height = op->height};
4091 char name[MAX_FONT_NAME];
4092 char *s = name;
4093 int rc;
4094
1da177e4
LT		 4095
4096 if (!op->data)
4097 s = NULL;
4098 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4099 return -EFAULT;
4100 else
4101 name[MAX_FONT_NAME - 1] = 0;
4102
ac751efa 4103 console_lock();
edab558f
AC		 4104 if (vc->vc_mode != KD_TEXT) {
4105 console_unlock();
4106 return -EINVAL;
4107 }
1da177e4
LT		 4108 if (vc->vc_sw->con_font_default)
4109 rc = vc->vc_sw->con_font_default(vc, &font, s);
4110 else
4111 rc = -ENOSYS;
ac751efa 4112 console_unlock();
1da177e4
LT		 4113 if (!rc) {
4114 op->width = font.width;
4115 op->height = font.height;
4116 }
4117 return rc;
4118}
4119
4120static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4121{
4122 int con = op->height;
4123 int rc;
4124
1da177e4 4125
ac751efa 4126 console_lock();
edab558f
AC		 4127 if (vc->vc_mode != KD_TEXT)
4128 rc = -EINVAL;
4129 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4130 rc = -ENOSYS;
4131 else if (con < 0 || !vc_cons_allocated(con))
4132 rc = -ENOTTY;
4133 else if (con == vc->vc_num) /* nothing to do */
4134 rc = 0;
4135 else
4136 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4137 console_unlock();
1da177e4
LT		 4138 return rc;
4139}
4140
4141int con_font_op(struct vc_data *vc, struct console_font_op *op)
4142{
4143 switch (op->op) {
4144 case KD_FONT_OP_SET:
4145 return con_font_set(vc, op);
4146 case KD_FONT_OP_GET:
4147 return con_font_get(vc, op);
4148 case KD_FONT_OP_SET_DEFAULT:
4149 return con_font_default(vc, op);
4150 case KD_FONT_OP_COPY:
4151 return con_font_copy(vc, op);
4152 }
4153 return -ENOSYS;
4154}
4155
4156/*
4157 * Interface exported to selection and vcs.
4158 */
4159
4160/* used by selection */
4161u16 screen_glyph(struct vc_data *vc, int offset)
4162{
4163 u16 w = scr_readw(screenpos(vc, offset, 1));
4164 u16 c = w & 0xff;
4165
4166 if (w & vc->vc_hi_font_mask)
4167 c |= 0x100;
4168 return c;
4169}
f7511d5f 4170EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4171
4172/* used by vcs - note the word offset */
4173unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4174{
4175 return screenpos(vc, 2 * w_offset, viewed);
4176}
4177
4178void getconsxy(struct vc_data *vc, unsigned char *p)
4179{
4180 p[0] = vc->vc_x;
4181 p[1] = vc->vc_y;
4182}
4183
4184void putconsxy(struct vc_data *vc, unsigned char *p)
4185{
9477e260 4186 hide_cursor(vc);
1da177e4
LT		 4187 gotoxy(vc, p[0], p[1]);
4188 set_cursor(vc);
4189}
4190
4191u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4192{
4193 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4194 return softcursor_original;
4195 return scr_readw(org);
4196}
4197
4198void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4199{
4200 scr_writew(val, org);
4201 if ((unsigned long)org == vc->vc_pos) {
4202 softcursor_original = -1;
4203 add_softcursor(vc);
4204 }
4205}
4206
432c9ed2
NP		 4207void vcs_scr_updated(struct vc_data *vc)
4208{
4209 notify_update(vc);
4210}
4211
1da177e4
LT		 4212/*
4213 * Visible symbols for modules
4214 */
4215
4216EXPORT_SYMBOL(color_table);
4217EXPORT_SYMBOL(default_red);
4218EXPORT_SYMBOL(default_grn);
4219EXPORT_SYMBOL(default_blu);
4220EXPORT_SYMBOL(update_region);
4221EXPORT_SYMBOL(redraw_screen);
4222EXPORT_SYMBOL(vc_resize);
4223EXPORT_SYMBOL(fg_console);
4224EXPORT_SYMBOL(console_blank_hook);
4225EXPORT_SYMBOL(console_blanked);
4226EXPORT_SYMBOL(vc_cons);
f6c06b68 4227EXPORT_SYMBOL(global_cursor_default);
1da177e4
LT		 4228#ifndef VT_SINGLE_DRIVER
4229EXPORT_SYMBOL(take_over_console);
4230EXPORT_SYMBOL(give_up_console);
4231#endif
Linux 6.x block layer and io_uring tree(s)