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vt: push down the tty lock so we can see what is left to tackle
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
1da177e4 102#include <asm/system.h>
d81ed103 103#include <linux/uaccess.h>
81d44507 104#include <linux/kdb.h>
74c807ce 105#include <linux/ctype.h>
1da177e4 106
3e795de7 107#define MAX_NR_CON_DRIVER 16
1da177e4 108
6db4063c 109#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 110#define CON_DRIVER_FLAG_INIT 2
111#define CON_DRIVER_FLAG_ATTR 4
3e795de7
AD		 112
113struct con_driver {
114 const struct consw *con;
115 const char *desc;
805952a8 116 struct device *dev;
6db4063c 117 int node;
3e795de7
AD		 118 int first;
119 int last;
120 int flag;
121};
122
123static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 124const struct consw *conswitchp;
125
126/* A bitmap for codes <32. A bit of 1 indicates that the code
127 * corresponding to that bit number invokes some special action
128 * (such as cursor movement) and should not be displayed as a
129 * glyph unless the disp_ctrl mode is explicitly enabled.
130 */
131#define CTRL_ACTION 0x0d00ff81
132#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
133
134/*
135 * Here is the default bell parameters: 750HZ, 1/8th of a second
136 */
137#define DEFAULT_BELL_PITCH 750
138#define DEFAULT_BELL_DURATION (HZ/8)
139
1da177e4
LT		 140struct vc vc_cons [MAX_NR_CONSOLES];
141
142#ifndef VT_SINGLE_DRIVER
143static const struct consw *con_driver_map[MAX_NR_CONSOLES];
144#endif
145
146static int con_open(struct tty_struct *, struct file *);
147static void vc_init(struct vc_data *vc, unsigned int rows,
148 unsigned int cols, int do_clear);
149static void gotoxy(struct vc_data *vc, int new_x, int new_y);
150static void save_cur(struct vc_data *vc);
151static void reset_terminal(struct vc_data *vc, int do_clear);
152static void con_flush_chars(struct tty_struct *tty);
403aac96 153static int set_vesa_blanking(char __user *p);
1da177e4
LT		 154static void set_cursor(struct vc_data *vc);
155static void hide_cursor(struct vc_data *vc);
65f27f38 156static void console_callback(struct work_struct *ignored);
1da177e4
LT		 157static void blank_screen_t(unsigned long dummy);
158static void set_palette(struct vc_data *vc);
159
160static int printable; /* Is console ready for printing? */
77bf2bab 161int default_utf8 = true;
042f10ec 162module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 163int global_cursor_default = -1;
164module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 165
9ea9a886
CL		 166static int cur_default = CUR_DEFAULT;
167module_param(cur_default, int, S_IRUGO | S_IWUSR);
168
1da177e4
LT		 169/*
170 * ignore_poke: don't unblank the screen when things are typed. This is
171 * mainly for the privacy of braille terminal users.
172 */
173static int ignore_poke;
174
175int do_poke_blanked_console;
176int console_blanked;
177
178static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 179static int vesa_off_interval;
f324edc8
DM		 180static int blankinterval = 10*60;
181core_param(consoleblank, blankinterval, int, 0444);
1da177e4 182
65f27f38 183static DECLARE_WORK(console_work, console_callback);
1da177e4
LT		 184
185/*
186 * fg_console is the current virtual console,
187 * last_console is the last used one,
188 * want_console is the console we want to switch to,
b45cfba4 189 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 190 */
191int fg_console;
192int last_console;
193int want_console = -1;
fed891c8
JW		 194static int saved_fg_console;
195static int saved_last_console;
196static int saved_want_console;
197static int saved_vc_mode;
beed5336 198static int saved_console_blanked;
1da177e4
LT		 199
200/*
201 * For each existing display, we have a pointer to console currently visible
202 * on that display, allowing consoles other than fg_console to be refreshed
203 * appropriately. Unless the low-level driver supplies its own display_fg
204 * variable, we use this one for the "master display".
205 */
206static struct vc_data *master_display_fg;
207
208/*
209 * Unfortunately, we need to delay tty echo when we're currently writing to the
210 * console since the code is (and always was) not re-entrant, so we schedule
211 * all flip requests to process context with schedule-task() and run it from
212 * console_callback().
213 */
214
215/*
216 * For the same reason, we defer scrollback to the console callback.
217 */
218static int scrollback_delta;
219
220/*
221 * Hook so that the power management routines can (un)blank
222 * the console on our behalf.
223 */
224int (*console_blank_hook)(int);
225
40565f19 226static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
1da177e4
LT		 227static int blank_state;
228static int blank_timer_expired;
229enum {
230 blank_off = 0,
231 blank_normal_wait,
232 blank_vesa_wait,
233};
234
fbc92a34
KS		 235/*
236 * /sys/class/tty/tty0/
237 *
238 * the attribute 'active' contains the name of the current vc
239 * console and it supports poll() to detect vc switches
240 */
241static struct device *tty0dev;
242
b293d758
ST		 243/*
244 * Notifier list for console events.
245 */
246static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
247
248int register_vt_notifier(struct notifier_block *nb)
249{
250 return atomic_notifier_chain_register(&vt_notifier_list, nb);
251}
252EXPORT_SYMBOL_GPL(register_vt_notifier);
253
254int unregister_vt_notifier(struct notifier_block *nb)
255{
256 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
257}
258EXPORT_SYMBOL_GPL(unregister_vt_notifier);
259
260static void notify_write(struct vc_data *vc, unsigned int unicode)
261{
502fcb79 262 struct vt_notifier_param param = { .vc = vc, .c = unicode };
b293d758
ST		 263 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
264}
265
266static void notify_update(struct vc_data *vc)
267{
268 struct vt_notifier_param param = { .vc = vc };
269 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
270}
1da177e4
LT		 271/*
272 * Low-Level Functions
273 */
274
275#define IS_FG(vc) ((vc)->vc_num == fg_console)
276
277#ifdef VT_BUF_VRAM_ONLY
278#define DO_UPDATE(vc) 0
279#else
f700d6e5 280#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
1da177e4
LT		 281#endif
282
283static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
284{
285 unsigned short *p;
286
287 if (!viewed)
288 p = (unsigned short *)(vc->vc_origin + offset);
289 else if (!vc->vc_sw->con_screen_pos)
290 p = (unsigned short *)(vc->vc_visible_origin + offset);
291 else
292 p = vc->vc_sw->con_screen_pos(vc, offset);
293 return p;
294}
295
e33ac1c1 296/* Called from the keyboard irq path.. */
1da177e4
LT		 297static inline void scrolldelta(int lines)
298{
e33ac1c1
AC		 299 /* FIXME */
300 /* scrolldelta needs some kind of consistency lock, but the BKL was
301 and still is not protecting versus the scheduled back end */
1da177e4
LT		 302 scrollback_delta += lines;
303 schedule_console_callback();
304}
305
306void schedule_console_callback(void)
307{
308 schedule_work(&console_work);
309}
310
311static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
312{
313 unsigned short *d, *s;
314
315 if (t+nr >= b)
316 nr = b - t - 1;
317 if (b > vc->vc_rows || t >= b || nr < 1)
318 return;
319 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
320 return;
321 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
322 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
323 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
386f40c8 324 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
1da177e4
LT		 325 vc->vc_size_row * nr);
326}
327
328static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
329{
330 unsigned short *s;
331 unsigned int step;
332
333 if (t+nr >= b)
334 nr = b - t - 1;
335 if (b > vc->vc_rows || t >= b || nr < 1)
336 return;
337 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
338 return;
339 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
340 step = vc->vc_cols * nr;
341 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
93f78da4 342 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
1da177e4
LT		 343}
344
345static void do_update_region(struct vc_data *vc, unsigned long start, int count)
346{
347#ifndef VT_BUF_VRAM_ONLY
348 unsigned int xx, yy, offset;
349 u16 *p;
350
351 p = (u16 *) start;
352 if (!vc->vc_sw->con_getxy) {
353 offset = (start - vc->vc_origin) / 2;
354 xx = offset % vc->vc_cols;
355 yy = offset / vc->vc_cols;
356 } else {
357 int nxx, nyy;
358 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
359 xx = nxx; yy = nyy;
360 }
361 for(;;) {
362 u16 attrib = scr_readw(p) & 0xff00;
363 int startx = xx;
364 u16 *q = p;
365 while (xx < vc->vc_cols && count) {
366 if (attrib != (scr_readw(p) & 0xff00)) {
367 if (p > q)
368 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
369 startx = xx;
370 q = p;
371 attrib = scr_readw(p) & 0xff00;
372 }
373 p++;
374 xx++;
375 count--;
376 }
377 if (p > q)
378 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
379 if (!count)
380 break;
381 xx = 0;
382 yy++;
383 if (vc->vc_sw->con_getxy) {
384 p = (u16 *)start;
385 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
386 }
387 }
388#endif
389}
390
391void update_region(struct vc_data *vc, unsigned long start, int count)
392{
393 WARN_CONSOLE_UNLOCKED();
394
395 if (DO_UPDATE(vc)) {
396 hide_cursor(vc);
397 do_update_region(vc, start, count);
398 set_cursor(vc);
399 }
400}
401
402/* Structure of attributes is hardware-dependent */
403
fa6ce9ab
JE		 404static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
405 u8 _underline, u8 _reverse, u8 _italic)
1da177e4
LT		 406{
407 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 408 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
409 _blink, _underline, _reverse, _italic);
1da177e4
LT		 410
411#ifndef VT_BUF_VRAM_ONLY
412/*
413 * ++roman: I completely changed the attribute format for monochrome
414 * mode (!can_do_color). The formerly used MDA (monochrome display
415 * adapter) format didn't allow the combination of certain effects.
416 * Now the attribute is just a bit vector:
417 * Bit 0..1: intensity (0..2)
418 * Bit 2 : underline
419 * Bit 3 : reverse
420 * Bit 7 : blink
421 */
422 {
c9e587ab 423 u8 a = _color;
1da177e4
LT		 424 if (!vc->vc_can_do_color)
425 return _intensity |
fa6ce9ab 426 (_italic ? 2 : 0) |
1da177e4
LT		 427 (_underline ? 4 : 0) |
428 (_reverse ? 8 : 0) |
429 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 430 if (_italic)
431 a = (a & 0xF0) | vc->vc_itcolor;
432 else if (_underline)
1da177e4
LT		 433 a = (a & 0xf0) | vc->vc_ulcolor;
434 else if (_intensity == 0)
435 a = (a & 0xf0) | vc->vc_ulcolor;
436 if (_reverse)
437 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
438 if (_blink)
439 a ^= 0x80;
440 if (_intensity == 2)
441 a ^= 0x08;
442 if (vc->vc_hi_font_mask == 0x100)
443 a <<= 1;
444 return a;
445 }
446#else
447 return 0;
448#endif
449}
450
451static void update_attr(struct vc_data *vc)
452{
fa6ce9ab
JE		 453 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
454 vc->vc_blink, vc->vc_underline,
455 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
456 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 457}
458
459/* Note: inverting the screen twice should revert to the original state */
460void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
461{
462 unsigned short *p;
463
464 WARN_CONSOLE_UNLOCKED();
465
466 count /= 2;
467 p = screenpos(vc, offset, viewed);
468 if (vc->vc_sw->con_invert_region)
469 vc->vc_sw->con_invert_region(vc, p, count);
470#ifndef VT_BUF_VRAM_ONLY
471 else {
472 u16 *q = p;
473 int cnt = count;
474 u16 a;
475
476 if (!vc->vc_can_do_color) {
477 while (cnt--) {
478 a = scr_readw(q);
479 a ^= 0x0800;
480 scr_writew(a, q);
481 q++;
482 }
483 } else if (vc->vc_hi_font_mask == 0x100) {
484 while (cnt--) {
485 a = scr_readw(q);
486 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
487 scr_writew(a, q);
488 q++;
489 }
490 } else {
491 while (cnt--) {
492 a = scr_readw(q);
493 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
494 scr_writew(a, q);
495 q++;
496 }
497 }
498 }
499#endif
500 if (DO_UPDATE(vc))
501 do_update_region(vc, (unsigned long) p, count);
502}
503
504/* used by selection: complement pointer position */
505void complement_pos(struct vc_data *vc, int offset)
506{
414edcd3 507 static int old_offset = -1;
1da177e4
LT		 508 static unsigned short old;
509 static unsigned short oldx, oldy;
510
511 WARN_CONSOLE_UNLOCKED();
512
414edcd3
AD		 513 if (old_offset != -1 && old_offset >= 0 &&
514 old_offset < vc->vc_screenbuf_size) {
515 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 516 if (DO_UPDATE(vc))
517 vc->vc_sw->con_putc(vc, old, oldy, oldx);
518 }
414edcd3
AD		 519
520 old_offset = offset;
521
522 if (offset != -1 && offset >= 0 &&
523 offset < vc->vc_screenbuf_size) {
1da177e4 524 unsigned short new;
414edcd3 525 unsigned short *p;
1da177e4
LT		 526 p = screenpos(vc, offset, 1);
527 old = scr_readw(p);
528 new = old ^ vc->vc_complement_mask;
529 scr_writew(new, p);
530 if (DO_UPDATE(vc)) {
531 oldx = (offset >> 1) % vc->vc_cols;
532 oldy = (offset >> 1) / vc->vc_cols;
533 vc->vc_sw->con_putc(vc, new, oldy, oldx);
534 }
535 }
414edcd3 536
1da177e4
LT		 537}
538
539static void insert_char(struct vc_data *vc, unsigned int nr)
540{
541 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
542
543 p = q + vc->vc_cols - nr - vc->vc_x;
544 while (--p >= q)
545 scr_writew(scr_readw(p), p + nr);
546 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
547 vc->vc_need_wrap = 0;
548 if (DO_UPDATE(vc)) {
549 unsigned short oldattr = vc->vc_attr;
550 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
551 vc->vc_cols - vc->vc_x - nr);
552 vc->vc_attr = vc->vc_video_erase_char >> 8;
553 while (nr--)
554 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
555 vc->vc_attr = oldattr;
556 }
557}
558
559static void delete_char(struct vc_data *vc, unsigned int nr)
560{
561 unsigned int i = vc->vc_x;
562 unsigned short *p = (unsigned short *)vc->vc_pos;
563
564 while (++i <= vc->vc_cols - nr) {
565 scr_writew(scr_readw(p+nr), p);
566 p++;
567 }
568 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
569 vc->vc_need_wrap = 0;
570 if (DO_UPDATE(vc)) {
571 unsigned short oldattr = vc->vc_attr;
572 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
573 vc->vc_cols - vc->vc_x - nr);
574 vc->vc_attr = vc->vc_video_erase_char >> 8;
575 while (nr--)
576 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
577 vc->vc_cols - 1 - nr);
578 vc->vc_attr = oldattr;
579 }
580}
581
582static int softcursor_original;
583
584static void add_softcursor(struct vc_data *vc)
585{
586 int i = scr_readw((u16 *) vc->vc_pos);
587 u32 type = vc->vc_cursor_type;
588
589 if (! (type & 0x10)) return;
590 if (softcursor_original != -1) return;
591 softcursor_original = i;
592 i |= ((type >> 8) & 0xff00 );
593 i ^= ((type) & 0xff00 );
594 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
595 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
596 scr_writew(i, (u16 *) vc->vc_pos);
597 if (DO_UPDATE(vc))
598 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
599}
600
601static void hide_softcursor(struct vc_data *vc)
602{
603 if (softcursor_original != -1) {
604 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
605 if (DO_UPDATE(vc))
606 vc->vc_sw->con_putc(vc, softcursor_original,
607 vc->vc_y, vc->vc_x);
608 softcursor_original = -1;
609 }
610}
611
612static void hide_cursor(struct vc_data *vc)
613{
614 if (vc == sel_cons)
615 clear_selection();
616 vc->vc_sw->con_cursor(vc, CM_ERASE);
617 hide_softcursor(vc);
618}
619
620static void set_cursor(struct vc_data *vc)
621{
622 if (!IS_FG(vc) || console_blanked ||
623 vc->vc_mode == KD_GRAPHICS)
624 return;
625 if (vc->vc_deccm) {
626 if (vc == sel_cons)
627 clear_selection();
628 add_softcursor(vc);
629 if ((vc->vc_cursor_type & 0x0f) != 1)
630 vc->vc_sw->con_cursor(vc, CM_DRAW);
631 } else
632 hide_cursor(vc);
633}
634
635static void set_origin(struct vc_data *vc)
636{
637 WARN_CONSOLE_UNLOCKED();
638
639 if (!CON_IS_VISIBLE(vc) ||
640 !vc->vc_sw->con_set_origin ||
641 !vc->vc_sw->con_set_origin(vc))
642 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
643 vc->vc_visible_origin = vc->vc_origin;
644 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
645 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
646}
647
648static inline void save_screen(struct vc_data *vc)
649{
650 WARN_CONSOLE_UNLOCKED();
651
652 if (vc->vc_sw->con_save_screen)
653 vc->vc_sw->con_save_screen(vc);
654}
655
656/*
657 * Redrawing of screen
658 */
659
660static void clear_buffer_attributes(struct vc_data *vc)
661{
662 unsigned short *p = (unsigned short *)vc->vc_origin;
663 int count = vc->vc_screenbuf_size / 2;
664 int mask = vc->vc_hi_font_mask | 0xff;
665
666 for (; count > 0; count--, p++) {
667 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
668 }
669}
670
671void redraw_screen(struct vc_data *vc, int is_switch)
672{
673 int redraw = 0;
674
675 WARN_CONSOLE_UNLOCKED();
676
677 if (!vc) {
678 /* strange ... */
679 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
680 return;
681 }
682
683 if (is_switch) {
684 struct vc_data *old_vc = vc_cons[fg_console].d;
685 if (old_vc == vc)
686 return;
687 if (!CON_IS_VISIBLE(vc))
688 redraw = 1;
689 *vc->vc_display_fg = vc;
690 fg_console = vc->vc_num;
691 hide_cursor(old_vc);
692 if (!CON_IS_VISIBLE(old_vc)) {
693 save_screen(old_vc);
694 set_origin(old_vc);
695 }
fbc92a34
KS		 696 if (tty0dev)
697 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 698 } else {
699 hide_cursor(vc);
700 redraw = 1;
701 }
702
703 if (redraw) {
704 int update;
705 int old_was_color = vc->vc_can_do_color;
706
707 set_origin(vc);
708 update = vc->vc_sw->con_switch(vc);
709 set_palette(vc);
710 /*
711 * If console changed from mono<->color, the best we can do
712 * is to clear the buffer attributes. As it currently stands,
713 * rebuilding new attributes from the old buffer is not doable
714 * without overly complex code.
715 */
716 if (old_was_color != vc->vc_can_do_color) {
717 update_attr(vc);
718 clear_buffer_attributes(vc);
719 }
8fd4bd22
JB		 720
721 /* Forcibly update if we're panicing */
722 if ((update && vc->vc_mode != KD_GRAPHICS) ||
723 vt_force_oops_output(vc))
1da177e4
LT		 724 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
725 }
726 set_cursor(vc);
727 if (is_switch) {
728 set_leds();
729 compute_shiftstate();
8182ec49 730 notify_update(vc);
1da177e4
LT		 731 }
732}
733
734/*
735 * Allocation, freeing and resizing of VTs.
736 */
737
738int vc_cons_allocated(unsigned int i)
739{
740 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
741}
742
743static void visual_init(struct vc_data *vc, int num, int init)
744{
745 /* ++Geert: vc->vc_sw->con_init determines console size */
746 if (vc->vc_sw)
747 module_put(vc->vc_sw->owner);
748 vc->vc_sw = conswitchp;
749#ifndef VT_SINGLE_DRIVER
750 if (con_driver_map[num])
751 vc->vc_sw = con_driver_map[num];
752#endif
753 __module_get(vc->vc_sw->owner);
754 vc->vc_num = num;
755 vc->vc_display_fg = &master_display_fg;
756 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
757 vc->vc_uni_pagedir = 0;
758 vc->vc_hi_font_mask = 0;
759 vc->vc_complement_mask = 0;
760 vc->vc_can_do_color = 0;
8fd4bd22 761 vc->vc_panic_force_write = false;
1da177e4
LT		 762 vc->vc_sw->con_init(vc, init);
763 if (!vc->vc_complement_mask)
764 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
765 vc->vc_s_complement_mask = vc->vc_complement_mask;
766 vc->vc_size_row = vc->vc_cols << 1;
767 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
768}
769
770int vc_allocate(unsigned int currcons) /* return 0 on success */
771{
772 WARN_CONSOLE_UNLOCKED();
773
774 if (currcons >= MAX_NR_CONSOLES)
775 return -ENXIO;
776 if (!vc_cons[currcons].d) {
777 struct vc_data *vc;
b293d758 778 struct vt_notifier_param param;
1da177e4
LT		 779
780 /* prevent users from taking too much memory */
781 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
782 return -EPERM;
783
784 /* due to the granularity of kmalloc, we waste some memory here */
785 /* the alloc is done in two steps, to optimize the common situation
786 of a 25x80 console (structsize=216, screenbuf_size=4000) */
787 /* although the numbers above are not valid since long ago, the
788 point is still up-to-date and the comment still has its value
789 even if only as a historical artifact. --mj, July 1998 */
b293d758 790 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1da177e4
LT		 791 if (!vc)
792 return -ENOMEM;
1da177e4 793 vc_cons[currcons].d = vc;
ff917ba4 794 tty_port_init(&vc->port);
c2c88f10 795 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 796 visual_init(vc, currcons, 1);
797 if (!*vc->vc_uni_pagedir_loc)
798 con_set_default_unimap(vc);
5c9228f0 799 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1da177e4
LT		 800 if (!vc->vc_screenbuf) {
801 kfree(vc);
802 vc_cons[currcons].d = NULL;
803 return -ENOMEM;
804 }
f6c06b68
MG		 805
806 /* If no drivers have overridden us and the user didn't pass a
807 boot option, default to displaying the cursor */
808 if (global_cursor_default == -1)
809 global_cursor_default = 1;
810
1da177e4 811 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
4995f8ef 812 vcs_make_sysfs(currcons);
b293d758 813 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1da177e4
LT		 814 }
815 return 0;
816}
817
e400b6ec
AD		 818static inline int resize_screen(struct vc_data *vc, int width, int height,
819 int user)
1da177e4
LT		 820{
821 /* Resizes the resolution of the display adapater */
822 int err = 0;
823
824 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 825 err = vc->vc_sw->con_resize(vc, width, height, user);
826
1da177e4
LT		 827 return err;
828}
829
830/*
831 * Change # of rows and columns (0 means unchanged/the size of fg_console)
832 * [this is to be used together with some user program
833 * like resize that changes the hardware videomode]
834 */
835#define VC_RESIZE_MAXCOL (32767)
836#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 837
838/**
839 * vc_do_resize - resizing method for the tty
840 * @tty: tty being resized
841 * @real_tty: real tty (different to tty if a pty/tty pair)
842 * @vc: virtual console private data
843 * @cols: columns
844 * @lines: lines
845 *
846 * Resize a virtual console, clipping according to the actual constraints.
847 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 848 * information and perform any necessary signal handling.
8c9a9dd0
AC		 849 *
850 * Caller must hold the console semaphore. Takes the termios mutex and
851 * ctrl_lock of the tty IFF a tty is passed.
852 */
853
fc6f6238
AC		 854static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
855 unsigned int cols, unsigned int lines)
1da177e4
LT		 856{
857 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 858 unsigned long end;
f2ee4ae8 859 unsigned int old_rows, old_row_size;
1da177e4 860 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 861 unsigned int user;
1da177e4
LT		 862 unsigned short *newscreen;
863
864 WARN_CONSOLE_UNLOCKED();
865
866 if (!vc)
867 return -ENXIO;
868
e400b6ec
AD		 869 user = vc->vc_resize_user;
870 vc->vc_resize_user = 0;
871
1da177e4
LT		 872 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
873 return -EINVAL;
874
875 new_cols = (cols ? cols : vc->vc_cols);
876 new_rows = (lines ? lines : vc->vc_rows);
877 new_row_size = new_cols << 1;
878 new_screen_size = new_row_size * new_rows;
879
880 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
881 return 0;
882
5cbded58 883 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 884 if (!newscreen)
885 return -ENOMEM;
886
887 old_rows = vc->vc_rows;
1da177e4 888 old_row_size = vc->vc_size_row;
1da177e4 889
e400b6ec 890 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 891 if (err) {
892 kfree(newscreen);
893 return err;
894 }
895
896 vc->vc_rows = new_rows;
897 vc->vc_cols = new_cols;
898 vc->vc_size_row = new_row_size;
899 vc->vc_screenbuf_size = new_screen_size;
900
901 rlth = min(old_row_size, new_row_size);
902 rrem = new_row_size - rlth;
903 old_origin = vc->vc_origin;
904 new_origin = (long) newscreen;
905 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 906
907 if (vc->vc_y > new_rows) {
908 if (old_rows - vc->vc_y < new_rows) {
909 /*
910 * Cursor near the bottom, copy contents from the
911 * bottom of buffer
912 */
913 old_origin += (old_rows - new_rows) * old_row_size;
3b41dc1a
AD		 914 } else {
915 /*
916 * Cursor is in no man's land, copy 1/2 screenful
917 * from the top and bottom of cursor position
918 */
919 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
3b41dc1a 920 }
9fc2b2d0
FJ		 921 }
922
923 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4
LT		 924
925 update_attr(vc);
926
3b41dc1a
AD		 927 while (old_origin < end) {
928 scr_memcpyw((unsigned short *) new_origin,
929 (unsigned short *) old_origin, rlth);
1da177e4 930 if (rrem)
3b41dc1a
AD		 931 scr_memsetw((void *)(new_origin + rlth),
932 vc->vc_video_erase_char, rrem);
1da177e4
LT		 933 old_origin += old_row_size;
934 new_origin += new_row_size;
935 }
936 if (new_scr_end > new_origin)
3b41dc1a
AD		 937 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
938 new_scr_end - new_origin);
5c9228f0 939 kfree(vc->vc_screenbuf);
1da177e4 940 vc->vc_screenbuf = newscreen;
1da177e4
LT		 941 vc->vc_screenbuf_size = new_screen_size;
942 set_origin(vc);
943
944 /* do part of a reset_terminal() */
945 vc->vc_top = 0;
946 vc->vc_bottom = vc->vc_rows;
947 gotoxy(vc, vc->vc_x, vc->vc_y);
948 save_cur(vc);
949
8c9a9dd0
AC		 950 if (tty) {
951 /* Rewrite the requested winsize data with the actual
952 resulting sizes */
953 struct winsize ws;
1da177e4
LT		 954 memset(&ws, 0, sizeof(ws));
955 ws.ws_row = vc->vc_rows;
956 ws.ws_col = vc->vc_cols;
957 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 958 tty_do_resize(tty, &ws);
1da177e4
LT		 959 }
960
961 if (CON_IS_VISIBLE(vc))
962 update_screen(vc);
8b92e87d 963 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 964 return err;
965}
966
8c9a9dd0
AC		 967/**
968 * vc_resize - resize a VT
969 * @vc: virtual console
970 * @cols: columns
971 * @rows: rows
972 *
973 * Resize a virtual console as seen from the console end of things. We
974 * use the common vc_do_resize methods to update the structures. The
975 * caller must hold the console sem to protect console internals and
8ce73264 976 * vc->port.tty
8c9a9dd0
AC		 977 */
978
979int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
980{
8ce73264 981 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 982}
983
984/**
985 * vt_resize - resize a VT
986 * @tty: tty to resize
8c9a9dd0
AC		 987 * @ws: winsize attributes
988 *
989 * Resize a virtual terminal. This is called by the tty layer as we
990 * register our own handler for resizing. The mutual helper does all
991 * the actual work.
992 *
993 * Takes the console sem and the called methods then take the tty
994 * termios_mutex and the tty ctrl_lock in that order.
995 */
da2bdf9a 996static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 997{
8c9a9dd0
AC		 998 struct vc_data *vc = tty->driver_data;
999 int ret;
ca9bda00 1000
ac751efa 1001 console_lock();
fc6f6238 1002 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 1003 console_unlock();
8c9a9dd0 1004 return ret;
ca9bda00 1005}
1da177e4 1006
ca9bda00 1007void vc_deallocate(unsigned int currcons)
1da177e4
LT		 1008{
1009 WARN_CONSOLE_UNLOCKED();
1010
1011 if (vc_cons_allocated(currcons)) {
1012 struct vc_data *vc = vc_cons[currcons].d;
b293d758 1013 struct vt_notifier_param param = { .vc = vc };
4995f8ef 1014
b293d758 1015 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1016 vcs_remove_sysfs(currcons);
1da177e4 1017 vc->vc_sw->con_deinit(vc);
bde0d2c9 1018 put_pid(vc->vt_pid);
d459ec0b 1019 module_put(vc->vc_sw->owner);
5c9228f0 1020 kfree(vc->vc_screenbuf);
1da177e4
LT		 1021 if (currcons >= MIN_NR_CONSOLES)
1022 kfree(vc);
1023 vc_cons[currcons].d = NULL;
1024 }
1025}
1026
1027/*
1028 * VT102 emulator
1029 */
1030
079c9534
AC		 1031#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1032#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1033#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1034
1035#define decarm VC_REPEAT
1036#define decckm VC_CKMODE
1037#define kbdapplic VC_APPLIC
1038#define lnm VC_CRLF
1039
1040/*
1041 * this is what the terminal answers to a ESC-Z or csi0c query.
1042 */
1043#define VT100ID "\033[?1;2c"
1044#define VT102ID "\033[?6c"
1045
1046unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1047 8,12,10,14, 9,13,11,15 };
1048
1049/* the default colour table, for VGA+ colour systems */
1050int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1051 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1052int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1053 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1054int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1055 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1056
1c2bbe6a
JE		 1057module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1058module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1059module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1060
1da177e4
LT		 1061/*
1062 * gotoxy() must verify all boundaries, because the arguments
1063 * might also be negative. If the given position is out of
1064 * bounds, the cursor is placed at the nearest margin.
1065 */
1066static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1067{
1068 int min_y, max_y;
1069
1070 if (new_x < 0)
1071 vc->vc_x = 0;
1072 else {
1073 if (new_x >= vc->vc_cols)
1074 vc->vc_x = vc->vc_cols - 1;
1075 else
1076 vc->vc_x = new_x;
1077 }
1078
1079 if (vc->vc_decom) {
1080 min_y = vc->vc_top;
1081 max_y = vc->vc_bottom;
1082 } else {
1083 min_y = 0;
1084 max_y = vc->vc_rows;
1085 }
1086 if (new_y < min_y)
1087 vc->vc_y = min_y;
1088 else if (new_y >= max_y)
1089 vc->vc_y = max_y - 1;
1090 else
1091 vc->vc_y = new_y;
1092 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1093 vc->vc_need_wrap = 0;
1094}
1095
1096/* for absolute user moves, when decom is set */
1097static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1098{
1099 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1100}
1101
1102void scrollback(struct vc_data *vc, int lines)
1103{
1104 if (!lines)
1105 lines = vc->vc_rows / 2;
1106 scrolldelta(-lines);
1107}
1108
1109void scrollfront(struct vc_data *vc, int lines)
1110{
1111 if (!lines)
1112 lines = vc->vc_rows / 2;
1113 scrolldelta(lines);
1114}
1115
1116static void lf(struct vc_data *vc)
1117{
1118 /* don't scroll if above bottom of scrolling region, or
1119 * if below scrolling region
1120 */
1121 if (vc->vc_y + 1 == vc->vc_bottom)
1122 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1123 else if (vc->vc_y < vc->vc_rows - 1) {
1124 vc->vc_y++;
1125 vc->vc_pos += vc->vc_size_row;
1126 }
1127 vc->vc_need_wrap = 0;
b293d758 1128 notify_write(vc, '\n');
1da177e4
LT		 1129}
1130
1131static void ri(struct vc_data *vc)
1132{
1133 /* don't scroll if below top of scrolling region, or
1134 * if above scrolling region
1135 */
1136 if (vc->vc_y == vc->vc_top)
1137 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1138 else if (vc->vc_y > 0) {
1139 vc->vc_y--;
1140 vc->vc_pos -= vc->vc_size_row;
1141 }
1142 vc->vc_need_wrap = 0;
1143}
1144
1145static inline void cr(struct vc_data *vc)
1146{
1147 vc->vc_pos -= vc->vc_x << 1;
1148 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1149 notify_write(vc, '\r');
1da177e4
LT		 1150}
1151
1152static inline void bs(struct vc_data *vc)
1153{
1154 if (vc->vc_x) {
1155 vc->vc_pos -= 2;
1156 vc->vc_x--;
1157 vc->vc_need_wrap = 0;
b293d758 1158 notify_write(vc, '\b');
1da177e4
LT		 1159 }
1160}
1161
1162static inline void del(struct vc_data *vc)
1163{
1164 /* ignored */
1165}
1166
1167static void csi_J(struct vc_data *vc, int vpar)
1168{
1169 unsigned int count;
1170 unsigned short * start;
1171
1172 switch (vpar) {
1173 case 0: /* erase from cursor to end of display */
1174 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1175 start = (unsigned short *)vc->vc_pos;
1176 if (DO_UPDATE(vc)) {
1177 /* do in two stages */
1178 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1179 vc->vc_cols - vc->vc_x);
1180 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1181 vc->vc_rows - vc->vc_y - 1,
1182 vc->vc_cols);
1183 }
1184 break;
1185 case 1: /* erase from start to cursor */
1186 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1187 start = (unsigned short *)vc->vc_origin;
1188 if (DO_UPDATE(vc)) {
1189 /* do in two stages */
1190 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1191 vc->vc_cols);
1192 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1193 vc->vc_x + 1);
1194 }
1195 break;
f8df13e0
PP		 1196 case 3: /* erase scroll-back buffer (and whole display) */
1197 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1198 vc->vc_screenbuf_size >> 1);
1199 set_origin(vc);
1200 if (CON_IS_VISIBLE(vc))
1201 update_screen(vc);
1202 /* fall through */
1da177e4
LT		 1203 case 2: /* erase whole display */
1204 count = vc->vc_cols * vc->vc_rows;
1205 start = (unsigned short *)vc->vc_origin;
1206 if (DO_UPDATE(vc))
1207 vc->vc_sw->con_clear(vc, 0, 0,
1208 vc->vc_rows,
1209 vc->vc_cols);
1210 break;
1211 default:
1212 return;
1213 }
1214 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1215 vc->vc_need_wrap = 0;
1216}
1217
1218static void csi_K(struct vc_data *vc, int vpar)
1219{
1220 unsigned int count;
1221 unsigned short * start;
1222
1223 switch (vpar) {
1224 case 0: /* erase from cursor to end of line */
1225 count = vc->vc_cols - vc->vc_x;
1226 start = (unsigned short *)vc->vc_pos;
1227 if (DO_UPDATE(vc))
1228 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1229 vc->vc_cols - vc->vc_x);
1230 break;
1231 case 1: /* erase from start of line to cursor */
1232 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1233 count = vc->vc_x + 1;
1234 if (DO_UPDATE(vc))
1235 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1236 vc->vc_x + 1);
1237 break;
1238 case 2: /* erase whole line */
1239 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1240 count = vc->vc_cols;
1241 if (DO_UPDATE(vc))
1242 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1243 vc->vc_cols);
1244 break;
1245 default:
1246 return;
1247 }
1248 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1249 vc->vc_need_wrap = 0;
1250}
1251
1252static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1253{ /* not vt100? */
1254 int count;
1255
1256 if (!vpar)
1257 vpar++;
1258 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1259
1260 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1261 if (DO_UPDATE(vc))
1262 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1263 vc->vc_need_wrap = 0;
1264}
1265
1266static void default_attr(struct vc_data *vc)
1267{
1268 vc->vc_intensity = 1;
fa6ce9ab 1269 vc->vc_italic = 0;
1da177e4
LT		 1270 vc->vc_underline = 0;
1271 vc->vc_reverse = 0;
1272 vc->vc_blink = 0;
1273 vc->vc_color = vc->vc_def_color;
1274}
1275
ac751efa 1276/* console_lock is held */
1da177e4
LT		 1277static void csi_m(struct vc_data *vc)
1278{
1279 int i;
1280
1281 for (i = 0; i <= vc->vc_npar; i++)
1282 switch (vc->vc_par[i]) {
1283 case 0: /* all attributes off */
1284 default_attr(vc);
1285 break;
1286 case 1:
1287 vc->vc_intensity = 2;
1288 break;
1289 case 2:
1290 vc->vc_intensity = 0;
1291 break;
fa6ce9ab
JE		 1292 case 3:
1293 vc->vc_italic = 1;
1294 break;
1da177e4
LT		 1295 case 4:
1296 vc->vc_underline = 1;
1297 break;
1298 case 5:
1299 vc->vc_blink = 1;
1300 break;
1301 case 7:
1302 vc->vc_reverse = 1;
1303 break;
1304 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1305 * Select primary font, don't display
1306 * control chars if defined, don't set
1307 * bit 8 on output.
1308 */
1309 vc->vc_translate = set_translate(vc->vc_charset == 0
1310 ? vc->vc_G0_charset
1311 : vc->vc_G1_charset, vc);
1312 vc->vc_disp_ctrl = 0;
1313 vc->vc_toggle_meta = 0;
1314 break;
1315 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1316 * Select first alternate font, lets
1317 * chars < 32 be displayed as ROM chars.
1318 */
1319 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1320 vc->vc_disp_ctrl = 1;
1321 vc->vc_toggle_meta = 0;
1322 break;
1323 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1324 * Select second alternate font, toggle
1325 * high bit before displaying as ROM char.
1326 */
1327 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1328 vc->vc_disp_ctrl = 1;
1329 vc->vc_toggle_meta = 1;
1330 break;
1331 case 21:
1332 case 22:
1333 vc->vc_intensity = 1;
1334 break;
fa6ce9ab
JE		 1335 case 23:
1336 vc->vc_italic = 0;
1337 break;
1da177e4
LT		 1338 case 24:
1339 vc->vc_underline = 0;
1340 break;
1341 case 25:
1342 vc->vc_blink = 0;
1343 break;
1344 case 27:
1345 vc->vc_reverse = 0;
1346 break;
1347 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1348 * Enables underscore, white foreground
1349 * with white underscore (Linux - use
1350 * default foreground).
1351 */
1352 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1353 vc->vc_underline = 1;
1354 break;
1355 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1356 * Disable underline option.
1357 * Reset colour to default? It did this
1358 * before...
1359 */
1360 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1361 vc->vc_underline = 0;
1362 break;
1363 case 49:
1364 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1365 break;
1366 default:
1367 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1368 vc->vc_color = color_table[vc->vc_par[i] - 30]
1369 | (vc->vc_color & 0xf0);
1370 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1371 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1372 | (vc->vc_color & 0x0f);
1373 break;
1374 }
1375 update_attr(vc);
1376}
1377
1378static void respond_string(const char *p, struct tty_struct *tty)
1379{
1380 while (*p) {
1381 tty_insert_flip_char(tty, *p, 0);
1382 p++;
1383 }
1384 con_schedule_flip(tty);
1385}
1386
1387static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1388{
1389 char buf[40];
1390
1391 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1392 respond_string(buf, tty);
1393}
1394
1395static inline void status_report(struct tty_struct *tty)
1396{
1397 respond_string("\033[0n", tty); /* Terminal ok */
1398}
1399
1400static inline void respond_ID(struct tty_struct * tty)
1401{
1402 respond_string(VT102ID, tty);
1403}
1404
1405void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1406{
1407 char buf[8];
1408
1409 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1410 (char)('!' + mry));
1411 respond_string(buf, tty);
1412}
1413
1414/* invoked via ioctl(TIOCLINUX) and through set_selection */
1415int mouse_reporting(void)
1416{
1417 return vc_cons[fg_console].d->vc_report_mouse;
1418}
1419
ac751efa 1420/* console_lock is held */
1da177e4
LT		 1421static void set_mode(struct vc_data *vc, int on_off)
1422{
1423 int i;
1424
1425 for (i = 0; i <= vc->vc_npar; i++)
1426 if (vc->vc_ques) {
1427 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1428 case 1: /* Cursor keys send ^[Ox/^[[x */
1429 if (on_off)
1430 set_kbd(vc, decckm);
1431 else
1432 clr_kbd(vc, decckm);
1433 break;
1434 case 3: /* 80/132 mode switch unimplemented */
1435 vc->vc_deccolm = on_off;
1436#if 0
1437 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1438 /* this alone does not suffice; some user mode
1439 utility has to change the hardware regs */
1440#endif
1441 break;
1442 case 5: /* Inverted screen on/off */
1443 if (vc->vc_decscnm != on_off) {
1444 vc->vc_decscnm = on_off;
1445 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1446 update_attr(vc);
1447 }
1448 break;
1449 case 6: /* Origin relative/absolute */
1450 vc->vc_decom = on_off;
1451 gotoxay(vc, 0, 0);
1452 break;
1453 case 7: /* Autowrap on/off */
1454 vc->vc_decawm = on_off;
1455 break;
1456 case 8: /* Autorepeat on/off */
1457 if (on_off)
1458 set_kbd(vc, decarm);
1459 else
1460 clr_kbd(vc, decarm);
1461 break;
1462 case 9:
1463 vc->vc_report_mouse = on_off ? 1 : 0;
1464 break;
1465 case 25: /* Cursor on/off */
1466 vc->vc_deccm = on_off;
1467 break;
1468 case 1000:
1469 vc->vc_report_mouse = on_off ? 2 : 0;
1470 break;
1471 }
1472 } else {
1473 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1474 case 3: /* Monitor (display ctrls) */
1475 vc->vc_disp_ctrl = on_off;
1476 break;
1477 case 4: /* Insert Mode on/off */
1478 vc->vc_decim = on_off;
1479 break;
1480 case 20: /* Lf, Enter == CrLf/Lf */
1481 if (on_off)
1482 set_kbd(vc, lnm);
1483 else
1484 clr_kbd(vc, lnm);
1485 break;
1486 }
1487 }
1488}
1489
ac751efa 1490/* console_lock is held */
1da177e4
LT		 1491static void setterm_command(struct vc_data *vc)
1492{
1493 switch(vc->vc_par[0]) {
1494 case 1: /* set color for underline mode */
1495 if (vc->vc_can_do_color &&
1496 vc->vc_par[1] < 16) {
1497 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1498 if (vc->vc_underline)
1499 update_attr(vc);
1500 }
1501 break;
1502 case 2: /* set color for half intensity mode */
1503 if (vc->vc_can_do_color &&
1504 vc->vc_par[1] < 16) {
1505 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1506 if (vc->vc_intensity == 0)
1507 update_attr(vc);
1508 }
1509 break;
1510 case 8: /* store colors as defaults */
1511 vc->vc_def_color = vc->vc_attr;
1512 if (vc->vc_hi_font_mask == 0x100)
1513 vc->vc_def_color >>= 1;
1514 default_attr(vc);
1515 update_attr(vc);
1516 break;
1517 case 9: /* set blanking interval */
f324edc8 1518 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1519 poke_blanked_console();
1520 break;
1521 case 10: /* set bell frequency in Hz */
1522 if (vc->vc_npar >= 1)
1523 vc->vc_bell_pitch = vc->vc_par[1];
1524 else
1525 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1526 break;
1527 case 11: /* set bell duration in msec */
1528 if (vc->vc_npar >= 1)
1529 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1530 vc->vc_par[1] * HZ / 1000 : 0;
1531 else
1532 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1533 break;
1534 case 12: /* bring specified console to the front */
1535 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1536 set_console(vc->vc_par[1] - 1);
1537 break;
1538 case 13: /* unblank the screen */
1539 poke_blanked_console();
1540 break;
1541 case 14: /* set vesa powerdown interval */
1542 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1543 break;
1544 case 15: /* activate the previous console */
1545 set_console(last_console);
1546 break;
1547 }
1548}
1549
ac751efa 1550/* console_lock is held */
1da177e4
LT		 1551static void csi_at(struct vc_data *vc, unsigned int nr)
1552{
1553 if (nr > vc->vc_cols - vc->vc_x)
1554 nr = vc->vc_cols - vc->vc_x;
1555 else if (!nr)
1556 nr = 1;
1557 insert_char(vc, nr);
1558}
1559
ac751efa 1560/* console_lock is held */
1da177e4
LT		 1561static void csi_L(struct vc_data *vc, unsigned int nr)
1562{
1563 if (nr > vc->vc_rows - vc->vc_y)
1564 nr = vc->vc_rows - vc->vc_y;
1565 else if (!nr)
1566 nr = 1;
1567 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1568 vc->vc_need_wrap = 0;
1569}
1570
ac751efa 1571/* console_lock is held */
1da177e4
LT		 1572static void csi_P(struct vc_data *vc, unsigned int nr)
1573{
1574 if (nr > vc->vc_cols - vc->vc_x)
1575 nr = vc->vc_cols - vc->vc_x;
1576 else if (!nr)
1577 nr = 1;
1578 delete_char(vc, nr);
1579}
1580
ac751efa 1581/* console_lock is held */
1da177e4
LT		 1582static void csi_M(struct vc_data *vc, unsigned int nr)
1583{
1584 if (nr > vc->vc_rows - vc->vc_y)
1585 nr = vc->vc_rows - vc->vc_y;
1586 else if (!nr)
1587 nr=1;
1588 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1589 vc->vc_need_wrap = 0;
1590}
1591
ac751efa 1592/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1593static void save_cur(struct vc_data *vc)
1594{
1595 vc->vc_saved_x = vc->vc_x;
1596 vc->vc_saved_y = vc->vc_y;
1597 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1598 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1599 vc->vc_s_underline = vc->vc_underline;
1600 vc->vc_s_blink = vc->vc_blink;
1601 vc->vc_s_reverse = vc->vc_reverse;
1602 vc->vc_s_charset = vc->vc_charset;
1603 vc->vc_s_color = vc->vc_color;
1604 vc->vc_saved_G0 = vc->vc_G0_charset;
1605 vc->vc_saved_G1 = vc->vc_G1_charset;
1606}
1607
ac751efa 1608/* console_lock is held */
1da177e4
LT		 1609static void restore_cur(struct vc_data *vc)
1610{
1611 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1612 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1613 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1614 vc->vc_underline = vc->vc_s_underline;
1615 vc->vc_blink = vc->vc_s_blink;
1616 vc->vc_reverse = vc->vc_s_reverse;
1617 vc->vc_charset = vc->vc_s_charset;
1618 vc->vc_color = vc->vc_s_color;
1619 vc->vc_G0_charset = vc->vc_saved_G0;
1620 vc->vc_G1_charset = vc->vc_saved_G1;
1621 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1622 update_attr(vc);
1623 vc->vc_need_wrap = 0;
1624}
1625
1626enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1627 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1628 ESpalette };
1629
ac751efa 1630/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1631static void reset_terminal(struct vc_data *vc, int do_clear)
1632{
1633 vc->vc_top = 0;
1634 vc->vc_bottom = vc->vc_rows;
1635 vc->vc_state = ESnormal;
1636 vc->vc_ques = 0;
1637 vc->vc_translate = set_translate(LAT1_MAP, vc);
1638 vc->vc_G0_charset = LAT1_MAP;
1639 vc->vc_G1_charset = GRAF_MAP;
1640 vc->vc_charset = 0;
1641 vc->vc_need_wrap = 0;
1642 vc->vc_report_mouse = 0;
042f10ec 1643 vc->vc_utf = default_utf8;
1da177e4
LT		 1644 vc->vc_utf_count = 0;
1645
1646 vc->vc_disp_ctrl = 0;
1647 vc->vc_toggle_meta = 0;
1648
1649 vc->vc_decscnm = 0;
1650 vc->vc_decom = 0;
1651 vc->vc_decawm = 1;
f6c06b68 1652 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1653 vc->vc_decim = 0;
1654
079c9534 1655 vt_reset_keyboard(vc->vc_num);
1da177e4 1656
9ea9a886 1657 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1658 vc->vc_complement_mask = vc->vc_s_complement_mask;
1659
1660 default_attr(vc);
1661 update_attr(vc);
1662
1663 vc->vc_tab_stop[0] = 0x01010100;
1664 vc->vc_tab_stop[1] =
1665 vc->vc_tab_stop[2] =
1666 vc->vc_tab_stop[3] =
a564738c
WK		 1667 vc->vc_tab_stop[4] =
1668 vc->vc_tab_stop[5] =
1669 vc->vc_tab_stop[6] =
1670 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1671
1672 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1673 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1674
1675 gotoxy(vc, 0, 0);
1676 save_cur(vc);
1677 if (do_clear)
1678 csi_J(vc, 2);
1679}
1680
ac751efa 1681/* console_lock is held */
1da177e4
LT		 1682static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1683{
1684 /*
1685 * Control characters can be used in the _middle_
1686 * of an escape sequence.
1687 */
1688 switch (c) {
1689 case 0:
1690 return;
1691 case 7:
1692 if (vc->vc_bell_duration)
1693 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1694 return;
1695 case 8:
1696 bs(vc);
1697 return;
1698 case 9:
1699 vc->vc_pos -= (vc->vc_x << 1);
1700 while (vc->vc_x < vc->vc_cols - 1) {
1701 vc->vc_x++;
1702 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1703 break;
1704 }
1705 vc->vc_pos += (vc->vc_x << 1);
b293d758 1706 notify_write(vc, '\t');
1da177e4
LT		 1707 return;
1708 case 10: case 11: case 12:
1709 lf(vc);
1710 if (!is_kbd(vc, lnm))
1711 return;
1712 case 13:
1713 cr(vc);
1714 return;
1715 case 14:
1716 vc->vc_charset = 1;
1717 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1718 vc->vc_disp_ctrl = 1;
1719 return;
1720 case 15:
1721 vc->vc_charset = 0;
1722 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1723 vc->vc_disp_ctrl = 0;
1724 return;
1725 case 24: case 26:
1726 vc->vc_state = ESnormal;
1727 return;
1728 case 27:
1729 vc->vc_state = ESesc;
1730 return;
1731 case 127:
1732 del(vc);
1733 return;
1734 case 128+27:
1735 vc->vc_state = ESsquare;
1736 return;
1737 }
1738 switch(vc->vc_state) {
1739 case ESesc:
1740 vc->vc_state = ESnormal;
1741 switch (c) {
1742 case '[':
1743 vc->vc_state = ESsquare;
1744 return;
1745 case ']':
1746 vc->vc_state = ESnonstd;
1747 return;
1748 case '%':
1749 vc->vc_state = ESpercent;
1750 return;
1751 case 'E':
1752 cr(vc);
1753 lf(vc);
1754 return;
1755 case 'M':
1756 ri(vc);
1757 return;
1758 case 'D':
1759 lf(vc);
1760 return;
1761 case 'H':
1762 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1763 return;
1764 case 'Z':
1765 respond_ID(tty);
1766 return;
1767 case '7':
1768 save_cur(vc);
1769 return;
1770 case '8':
1771 restore_cur(vc);
1772 return;
1773 case '(':
1774 vc->vc_state = ESsetG0;
1775 return;
1776 case ')':
1777 vc->vc_state = ESsetG1;
1778 return;
1779 case '#':
1780 vc->vc_state = EShash;
1781 return;
1782 case 'c':
1783 reset_terminal(vc, 1);
1784 return;
1785 case '>': /* Numeric keypad */
1786 clr_kbd(vc, kbdapplic);
1787 return;
1788 case '=': /* Appl. keypad */
1789 set_kbd(vc, kbdapplic);
1790 return;
1791 }
1792 return;
1793 case ESnonstd:
1794 if (c=='P') { /* palette escape sequence */
1795 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1796 vc->vc_par[vc->vc_npar] = 0;
1797 vc->vc_npar = 0;
1798 vc->vc_state = ESpalette;
1799 return;
1800 } else if (c=='R') { /* reset palette */
1801 reset_palette(vc);
1802 vc->vc_state = ESnormal;
1803 } else
1804 vc->vc_state = ESnormal;
1805 return;
1806 case ESpalette:
74c807ce
AS		 1807 if (isxdigit(c)) {
1808 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1809 if (vc->vc_npar == 7) {
1810 int i = vc->vc_par[0] * 3, j = 1;
1811 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1812 vc->vc_palette[i++] += vc->vc_par[j++];
1813 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1814 vc->vc_palette[i++] += vc->vc_par[j++];
1815 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1816 vc->vc_palette[i] += vc->vc_par[j];
1817 set_palette(vc);
1818 vc->vc_state = ESnormal;
1819 }
1820 } else
1821 vc->vc_state = ESnormal;
1822 return;
1823 case ESsquare:
1824 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1825 vc->vc_par[vc->vc_npar] = 0;
1826 vc->vc_npar = 0;
1827 vc->vc_state = ESgetpars;
1828 if (c == '[') { /* Function key */
1829 vc->vc_state=ESfunckey;
1830 return;
1831 }
1832 vc->vc_ques = (c == '?');
1833 if (vc->vc_ques)
1834 return;
1835 case ESgetpars:
1836 if (c == ';' && vc->vc_npar < NPAR - 1) {
1837 vc->vc_npar++;
1838 return;
1839 } else if (c>='0' && c<='9') {
1840 vc->vc_par[vc->vc_npar] *= 10;
1841 vc->vc_par[vc->vc_npar] += c - '0';
1842 return;
1843 } else
1844 vc->vc_state = ESgotpars;
1845 case ESgotpars:
1846 vc->vc_state = ESnormal;
1847 switch(c) {
1848 case 'h':
1849 set_mode(vc, 1);
1850 return;
1851 case 'l':
1852 set_mode(vc, 0);
1853 return;
1854 case 'c':
1855 if (vc->vc_ques) {
1856 if (vc->vc_par[0])
1857 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1858 else
9ea9a886 1859 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1860 return;
1861 }
1862 break;
1863 case 'm':
1864 if (vc->vc_ques) {
1865 clear_selection();
1866 if (vc->vc_par[0])
1867 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1868 else
1869 vc->vc_complement_mask = vc->vc_s_complement_mask;
1870 return;
1871 }
1872 break;
1873 case 'n':
1874 if (!vc->vc_ques) {
1875 if (vc->vc_par[0] == 5)
1876 status_report(tty);
1877 else if (vc->vc_par[0] == 6)
1878 cursor_report(vc, tty);
1879 }
1880 return;
1881 }
1882 if (vc->vc_ques) {
1883 vc->vc_ques = 0;
1884 return;
1885 }
1886 switch(c) {
1887 case 'G': case '`':
1888 if (vc->vc_par[0])
1889 vc->vc_par[0]--;
1890 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1891 return;
1892 case 'A':
1893 if (!vc->vc_par[0])
1894 vc->vc_par[0]++;
1895 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1896 return;
1897 case 'B': case 'e':
1898 if (!vc->vc_par[0])
1899 vc->vc_par[0]++;
1900 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1901 return;
1902 case 'C': case 'a':
1903 if (!vc->vc_par[0])
1904 vc->vc_par[0]++;
1905 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1906 return;
1907 case 'D':
1908 if (!vc->vc_par[0])
1909 vc->vc_par[0]++;
1910 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1911 return;
1912 case 'E':
1913 if (!vc->vc_par[0])
1914 vc->vc_par[0]++;
1915 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1916 return;
1917 case 'F':
1918 if (!vc->vc_par[0])
1919 vc->vc_par[0]++;
1920 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1921 return;
1922 case 'd':
1923 if (vc->vc_par[0])
1924 vc->vc_par[0]--;
1925 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1926 return;
1927 case 'H': case 'f':
1928 if (vc->vc_par[0])
1929 vc->vc_par[0]--;
1930 if (vc->vc_par[1])
1931 vc->vc_par[1]--;
1932 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1933 return;
1934 case 'J':
1935 csi_J(vc, vc->vc_par[0]);
1936 return;
1937 case 'K':
1938 csi_K(vc, vc->vc_par[0]);
1939 return;
1940 case 'L':
1941 csi_L(vc, vc->vc_par[0]);
1942 return;
1943 case 'M':
1944 csi_M(vc, vc->vc_par[0]);
1945 return;
1946 case 'P':
1947 csi_P(vc, vc->vc_par[0]);
1948 return;
1949 case 'c':
1950 if (!vc->vc_par[0])
1951 respond_ID(tty);
1952 return;
1953 case 'g':
1954 if (!vc->vc_par[0])
1955 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1956 else if (vc->vc_par[0] == 3) {
1957 vc->vc_tab_stop[0] =
1958 vc->vc_tab_stop[1] =
1959 vc->vc_tab_stop[2] =
1960 vc->vc_tab_stop[3] =
a564738c
WK		 1961 vc->vc_tab_stop[4] =
1962 vc->vc_tab_stop[5] =
1963 vc->vc_tab_stop[6] =
1964 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 1965 }
1966 return;
1967 case 'm':
1968 csi_m(vc);
1969 return;
1970 case 'q': /* DECLL - but only 3 leds */
1971 /* map 0,1,2,3 to 0,1,2,4 */
1972 if (vc->vc_par[0] < 4)
079c9534 1973 vt_set_led_state(vc->vc_num,
1da177e4
LT		 1974 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1975 return;
1976 case 'r':
1977 if (!vc->vc_par[0])
1978 vc->vc_par[0]++;
1979 if (!vc->vc_par[1])
1980 vc->vc_par[1] = vc->vc_rows;
1981 /* Minimum allowed region is 2 lines */
1982 if (vc->vc_par[0] < vc->vc_par[1] &&
1983 vc->vc_par[1] <= vc->vc_rows) {
1984 vc->vc_top = vc->vc_par[0] - 1;
1985 vc->vc_bottom = vc->vc_par[1];
1986 gotoxay(vc, 0, 0);
1987 }
1988 return;
1989 case 's':
1990 save_cur(vc);
1991 return;
1992 case 'u':
1993 restore_cur(vc);
1994 return;
1995 case 'X':
1996 csi_X(vc, vc->vc_par[0]);
1997 return;
1998 case '@':
1999 csi_at(vc, vc->vc_par[0]);
2000 return;
2001 case ']': /* setterm functions */
2002 setterm_command(vc);
2003 return;
2004 }
2005 return;
2006 case ESpercent:
2007 vc->vc_state = ESnormal;
2008 switch (c) {
2009 case '@': /* defined in ISO 2022 */
2010 vc->vc_utf = 0;
2011 return;
2012 case 'G': /* prelim official escape code */
2013 case '8': /* retained for compatibility */
2014 vc->vc_utf = 1;
2015 return;
2016 }
2017 return;
2018 case ESfunckey:
2019 vc->vc_state = ESnormal;
2020 return;
2021 case EShash:
2022 vc->vc_state = ESnormal;
2023 if (c == '8') {
2024 /* DEC screen alignment test. kludge :-) */
2025 vc->vc_video_erase_char =
2026 (vc->vc_video_erase_char & 0xff00) | 'E';
2027 csi_J(vc, 2);
2028 vc->vc_video_erase_char =
2029 (vc->vc_video_erase_char & 0xff00) | ' ';
2030 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2031 }
2032 return;
2033 case ESsetG0:
2034 if (c == '0')
2035 vc->vc_G0_charset = GRAF_MAP;
2036 else if (c == 'B')
2037 vc->vc_G0_charset = LAT1_MAP;
2038 else if (c == 'U')
2039 vc->vc_G0_charset = IBMPC_MAP;
2040 else if (c == 'K')
2041 vc->vc_G0_charset = USER_MAP;
2042 if (vc->vc_charset == 0)
2043 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2044 vc->vc_state = ESnormal;
2045 return;
2046 case ESsetG1:
2047 if (c == '0')
2048 vc->vc_G1_charset = GRAF_MAP;
2049 else if (c == 'B')
2050 vc->vc_G1_charset = LAT1_MAP;
2051 else if (c == 'U')
2052 vc->vc_G1_charset = IBMPC_MAP;
2053 else if (c == 'K')
2054 vc->vc_G1_charset = USER_MAP;
2055 if (vc->vc_charset == 1)
2056 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2057 vc->vc_state = ESnormal;
2058 return;
2059 default:
2060 vc->vc_state = ESnormal;
2061 }
2062}
2063
2f1a2ccb 2064/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2065 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2066 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2067 */
2068struct interval {
2069 uint32_t first;
2070 uint32_t last;
2071};
2072
2073static int bisearch(uint32_t ucs, const struct interval *table, int max)
2074{
2075 int min = 0;
2076 int mid;
2077
2078 if (ucs < table[0].first || ucs > table[max].last)
2079 return 0;
2080 while (max >= min) {
2081 mid = (min + max) / 2;
2082 if (ucs > table[mid].last)
2083 min = mid + 1;
2084 else if (ucs < table[mid].first)
2085 max = mid - 1;
2086 else
2087 return 1;
2088 }
2089 return 0;
2090}
2091
2092static int is_double_width(uint32_t ucs)
2093{
2094 static const struct interval double_width[] = {
2095 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2096 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2097 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2098 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2099 };
0f11541b 2100 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2101}
2102
ac751efa 2103/* acquires console_lock */
1da177e4
LT		 2104static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2105{
2106#ifdef VT_BUF_VRAM_ONLY
2107#define FLUSH do { } while(0);
2108#else
2109#define FLUSH if (draw_x >= 0) { \
2110 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2111 draw_x = -1; \
2112 }
2113#endif
2114
2115 int c, tc, ok, n = 0, draw_x = -1;
2116 unsigned int currcons;
2117 unsigned long draw_from = 0, draw_to = 0;
2118 struct vc_data *vc;
2f1a2ccb 2119 unsigned char vc_attr;
0341a4d0 2120 struct vt_notifier_param param;
2f1a2ccb
EK		 2121 uint8_t rescan;
2122 uint8_t inverse;
2123 uint8_t width;
1da177e4 2124 u16 himask, charmask;
1da177e4
LT		 2125
2126 if (in_interrupt())
2127 return count;
2128
2129 might_sleep();
2130
ac751efa 2131 console_lock();
1da177e4
LT		 2132 vc = tty->driver_data;
2133 if (vc == NULL) {
2134 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2135 console_unlock();
1da177e4
LT		 2136 return 0;
2137 }
2138
2139 currcons = vc->vc_num;
2140 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2141 /* could this happen? */
2142 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2143 console_unlock();
2144 return 0;
1da177e4 2145 }
1da177e4 2146
1da177e4
LT		 2147 himask = vc->vc_hi_font_mask;
2148 charmask = himask ? 0x1ff : 0xff;
2149
2150 /* undraw cursor first */
2151 if (IS_FG(vc))
2152 hide_cursor(vc);
2153
0341a4d0
KD		 2154 param.vc = vc;
2155
1da177e4
LT		 2156 while (!tty->stopped && count) {
2157 int orig = *buf;
2158 c = orig;
2159 buf++;
2160 n++;
2161 count--;
2f1a2ccb
EK		 2162 rescan = 0;
2163 inverse = 0;
2164 width = 1;
1da177e4
LT		 2165
2166 /* Do no translation at all in control states */
2167 if (vc->vc_state != ESnormal) {
2168 tc = c;
d4328b40 2169 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2170 /* Combine UTF-8 into Unicode in vc_utf_char.
2171 * vc_utf_count is the number of continuation bytes still
2172 * expected to arrive.
2173 * vc_npar is the number of continuation bytes arrived so
2174 * far
2175 */
d4328b40 2176rescan_last_byte:
2f1a2ccb
EK		 2177 if ((c & 0xc0) == 0x80) {
2178 /* Continuation byte received */
2179 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2180 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2181 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2182 vc->vc_npar++;
2183 if (--vc->vc_utf_count) {
2184 /* Still need some bytes */
1da177e4 2185 continue;
2f1a2ccb
EK		 2186 }
2187 /* Got a whole character */
2188 c = vc->vc_utf_char;
2189 /* Reject overlong sequences */
2190 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2191 c > utf8_length_changes[vc->vc_npar])
2192 c = 0xfffd;
2193 } else {
2194 /* Unexpected continuation byte */
2195 vc->vc_utf_count = 0;
2196 c = 0xfffd;
2197 }
1da177e4 2198 } else {
2f1a2ccb
EK		 2199 /* Single ASCII byte or first byte of a sequence received */
2200 if (vc->vc_utf_count) {
2201 /* Continuation byte expected */
2202 rescan = 1;
2203 vc->vc_utf_count = 0;
2204 c = 0xfffd;
2205 } else if (c > 0x7f) {
2206 /* First byte of a multibyte sequence received */
2207 vc->vc_npar = 0;
2208 if ((c & 0xe0) == 0xc0) {
2209 vc->vc_utf_count = 1;
2210 vc->vc_utf_char = (c & 0x1f);
2211 } else if ((c & 0xf0) == 0xe0) {
2212 vc->vc_utf_count = 2;
2213 vc->vc_utf_char = (c & 0x0f);
2214 } else if ((c & 0xf8) == 0xf0) {
2215 vc->vc_utf_count = 3;
2216 vc->vc_utf_char = (c & 0x07);
2217 } else if ((c & 0xfc) == 0xf8) {
2218 vc->vc_utf_count = 4;
2219 vc->vc_utf_char = (c & 0x03);
2220 } else if ((c & 0xfe) == 0xfc) {
2221 vc->vc_utf_count = 5;
2222 vc->vc_utf_char = (c & 0x01);
2223 } else {
2224 /* 254 and 255 are invalid */
2225 c = 0xfffd;
2226 }
2227 if (vc->vc_utf_count) {
2228 /* Still need some bytes */
2229 continue;
2230 }
2231 }
2232 /* Nothing to do if an ASCII byte was received */
1da177e4 2233 }
2f1a2ccb
EK		 2234 /* End of UTF-8 decoding. */
2235 /* c is the received character, or U+FFFD for invalid sequences. */
2236 /* Replace invalid Unicode code points with U+FFFD too */
2237 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2238 c = 0xfffd;
2239 tc = c;
d4328b40 2240 } else { /* no utf or alternate charset mode */
a29ccf6f 2241 tc = vc_translate(vc, c);
1da177e4
LT		 2242 }
2243
0341a4d0
KD		 2244 param.c = tc;
2245 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2246 &param) == NOTIFY_STOP)
2247 continue;
2248
1da177e4
LT		 2249 /* If the original code was a control character we
2250 * only allow a glyph to be displayed if the code is
2251 * not normally used (such as for cursor movement) or
2252 * if the disp_ctrl mode has been explicitly enabled.
2253 * Certain characters (as given by the CTRL_ALWAYS
2254 * bitmap) are always displayed as control characters,
2255 * as the console would be pretty useless without
2256 * them; to display an arbitrary font position use the
2257 * direct-to-font zone in UTF-8 mode.
2258 */
2259 ok = tc && (c >= 32 ||
d4328b40
AT		 2260 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2261 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2262 && (c != 127 || vc->vc_disp_ctrl)
2263 && (c != 128+27);
2264
2265 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2266 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2267 if (is_double_width(c))
2268 width = 2;
2269 }
1da177e4
LT		 2270 /* Now try to find out how to display it */
2271 tc = conv_uni_to_pc(vc, tc);
d4328b40 2272 if (tc & ~charmask) {
2f1a2ccb
EK		 2273 if (tc == -1 || tc == -2) {
2274 continue; /* nothing to display */
2275 }
2276 /* Glyph not found */
c0b79882 2277 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2278 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2279 This would make absolutely no sense with Unicode in mind,
2280 but do this for ASCII characters since a font may lack
2281 Unicode mapping info and we don't want to end up with
2282 having question marks only. */
2f1a2ccb
EK		 2283 tc = c;
2284 } else {
2285 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2286 tc = conv_uni_to_pc(vc, 0xfffd);
2287 if (tc < 0) {
2288 inverse = 1;
2289 tc = conv_uni_to_pc(vc, '?');
2290 if (tc < 0) tc = '?';
2291 }
2292 }
d4328b40 2293 }
1da177e4 2294
2f1a2ccb
EK		 2295 if (!inverse) {
2296 vc_attr = vc->vc_attr;
1da177e4 2297 } else {
2f1a2ccb
EK		 2298 /* invert vc_attr */
2299 if (!vc->vc_can_do_color) {
2300 vc_attr = (vc->vc_attr) ^ 0x08;
2301 } else if (vc->vc_hi_font_mask == 0x100) {
2302 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2303 } else {
2304 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2305 }
1ed8a2b3 2306 FLUSH
1da177e4 2307 }
2f1a2ccb
EK		 2308
2309 while (1) {
2310 if (vc->vc_need_wrap || vc->vc_decim)
2311 FLUSH
2312 if (vc->vc_need_wrap) {
2313 cr(vc);
2314 lf(vc);
2315 }
2316 if (vc->vc_decim)
2317 insert_char(vc, 1);
2318 scr_writew(himask ?
2319 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2320 (vc_attr << 8) + tc,
2321 (u16 *) vc->vc_pos);
2322 if (DO_UPDATE(vc) && draw_x < 0) {
2323 draw_x = vc->vc_x;
2324 draw_from = vc->vc_pos;
2325 }
2326 if (vc->vc_x == vc->vc_cols - 1) {
2327 vc->vc_need_wrap = vc->vc_decawm;
2328 draw_to = vc->vc_pos + 2;
2329 } else {
2330 vc->vc_x++;
2331 draw_to = (vc->vc_pos += 2);
d4328b40 2332 }
2f1a2ccb
EK		 2333
2334 if (!--width) break;
2335
2336 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2337 if (tc < 0) tc = ' ';
2338 }
b293d758 2339 notify_write(vc, c);
2f1a2ccb 2340
1ed8a2b3
EK		 2341 if (inverse) {
2342 FLUSH
2343 }
2344
2f1a2ccb
EK		 2345 if (rescan) {
2346 rescan = 0;
2347 inverse = 0;
2348 width = 1;
d4328b40
AT		 2349 c = orig;
2350 goto rescan_last_byte;
2351 }
1da177e4
LT		 2352 continue;
2353 }
2354 FLUSH
2355 do_con_trol(tty, vc, orig);
2356 }
2357 FLUSH
2358 console_conditional_schedule();
ac751efa 2359 console_unlock();
b293d758 2360 notify_update(vc);
1da177e4
LT		 2361 return n;
2362#undef FLUSH
2363}
2364
2365/*
2366 * This is the console switching callback.
2367 *
2368 * Doing console switching in a process context allows
2369 * us to do the switches asynchronously (needed when we want
2370 * to switch due to a keyboard interrupt). Synchronization
2371 * with other console code and prevention of re-entrancy is
ac751efa 2372 * ensured with console_lock.
1da177e4 2373 */
65f27f38 2374static void console_callback(struct work_struct *ignored)
1da177e4 2375{
ac751efa 2376 console_lock();
1da177e4
LT		 2377
2378 if (want_console >= 0) {
2379 if (want_console != fg_console &&
2380 vc_cons_allocated(want_console)) {
2381 hide_cursor(vc_cons[fg_console].d);
2382 change_console(vc_cons[want_console].d);
2383 /* we only changed when the console had already
2384 been allocated - a new console is not created
2385 in an interrupt routine */
2386 }
2387 want_console = -1;
2388 }
2389 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2390 do_poke_blanked_console = 0;
2391 poke_blanked_console();
2392 }
2393 if (scrollback_delta) {
2394 struct vc_data *vc = vc_cons[fg_console].d;
2395 clear_selection();
2396 if (vc->vc_mode == KD_TEXT)
2397 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2398 scrollback_delta = 0;
2399 }
2400 if (blank_timer_expired) {
2401 do_blank_screen(0);
2402 blank_timer_expired = 0;
2403 }
b293d758 2404 notify_update(vc_cons[fg_console].d);
1da177e4 2405
ac751efa 2406 console_unlock();
1da177e4
LT		 2407}
2408
b257bc05 2409int set_console(int nr)
1da177e4 2410{
b257bc05
AJ		 2411 struct vc_data *vc = vc_cons[fg_console].d;
2412
2413 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2414 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2415
2416 /*
2417 * Console switch will fail in console_callback() or
2418 * change_console() so there is no point scheduling
2419 * the callback
2420 *
2421 * Existing set_console() users don't check the return
2422 * value so this shouldn't break anything
2423 */
2424 return -EINVAL;
2425 }
2426
1da177e4
LT		 2427 want_console = nr;
2428 schedule_console_callback();
b257bc05
AJ		 2429
2430 return 0;
1da177e4
LT		 2431}
2432
2433struct tty_driver *console_driver;
2434
2435#ifdef CONFIG_VT_CONSOLE
2436
5ada918b
BW		 2437/**
2438 * vt_kmsg_redirect() - Sets/gets the kernel message console
2439 * @new: The new virtual terminal number or -1 if the console should stay
2440 * unchanged
2441 *
2442 * By default, the kernel messages are always printed on the current virtual
2443 * console. However, the user may modify that default with the
2444 * TIOCL_SETKMSGREDIRECT ioctl call.
2445 *
2446 * This function sets the kernel message console to be @new. It returns the old
2447 * virtual console number. The virtual terminal number 0 (both as parameter and
2448 * return value) means no redirection (i.e. always printed on the currently
2449 * active console).
2450 *
2451 * The parameter -1 means that only the current console is returned, but the
2452 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2453 * case to make the code more understandable.
2454 *
2455 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2456 * the parameter and always returns 0.
2457 */
2458int vt_kmsg_redirect(int new)
2459{
2460 static int kmsg_con;
2461
2462 if (new != -1)
2463 return xchg(&kmsg_con, new);
2464 else
2465 return kmsg_con;
2466}
2467
1da177e4
LT		 2468/*
2469 * Console on virtual terminal
2470 *
2471 * The console must be locked when we get here.
2472 */
2473
2474static void vt_console_print(struct console *co, const char *b, unsigned count)
2475{
2476 struct vc_data *vc = vc_cons[fg_console].d;
2477 unsigned char c;
b0940003 2478 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2479 const ushort *start;
2480 ushort cnt = 0;
2481 ushort myx;
5ada918b 2482 int kmsg_console;
1da177e4
LT		 2483
2484 /* console busy or not yet initialized */
b0940003
NP		 2485 if (!printable)
2486 return;
2487 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2488 return;
2489
5ada918b
BW		 2490 kmsg_console = vt_get_kmsg_redirect();
2491 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2492 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2493
2494 /* read `x' only after setting currcons properly (otherwise
2495 the `x' macro will read the x of the foreground console). */
2496 myx = vc->vc_x;
2497
2498 if (!vc_cons_allocated(fg_console)) {
2499 /* impossible */
2500 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2501 goto quit;
2502 }
2503
8fd4bd22 2504 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2505 goto quit;
2506
2507 /* undraw cursor first */
2508 if (IS_FG(vc))
2509 hide_cursor(vc);
2510
2511 start = (ushort *)vc->vc_pos;
2512
2513 /* Contrived structure to try to emulate original need_wrap behaviour
2514 * Problems caused when we have need_wrap set on '\n' character */
2515 while (count--) {
2516 c = *b++;
2517 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2518 if (cnt > 0) {
2519 if (CON_IS_VISIBLE(vc))
2520 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2521 vc->vc_x += cnt;
2522 if (vc->vc_need_wrap)
2523 vc->vc_x--;
2524 cnt = 0;
2525 }
2526 if (c == 8) { /* backspace */
2527 bs(vc);
2528 start = (ushort *)vc->vc_pos;
2529 myx = vc->vc_x;
2530 continue;
2531 }
2532 if (c != 13)
2533 lf(vc);
2534 cr(vc);
2535 start = (ushort *)vc->vc_pos;
2536 myx = vc->vc_x;
2537 if (c == 10 || c == 13)
2538 continue;
2539 }
2540 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2541 notify_write(vc, c);
1da177e4
LT		 2542 cnt++;
2543 if (myx == vc->vc_cols - 1) {
2544 vc->vc_need_wrap = 1;
2545 continue;
2546 }
2547 vc->vc_pos += 2;
2548 myx++;
2549 }
2550 if (cnt > 0) {
2551 if (CON_IS_VISIBLE(vc))
2552 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2553 vc->vc_x += cnt;
2554 if (vc->vc_x == vc->vc_cols) {
2555 vc->vc_x--;
2556 vc->vc_need_wrap = 1;
2557 }
2558 }
2559 set_cursor(vc);
b293d758 2560 notify_update(vc);
1da177e4
LT		 2561
2562quit:
b0940003 2563 spin_unlock(&printing_lock);
1da177e4
LT		 2564}
2565
2566static struct tty_driver *vt_console_device(struct console *c, int *index)
2567{
2568 *index = c->index ? c->index-1 : fg_console;
2569 return console_driver;
2570}
2571
2572static struct console vt_console_driver = {
2573 .name = "tty",
2574 .write = vt_console_print,
2575 .device = vt_console_device,
2576 .unblank = unblank_screen,
2577 .flags = CON_PRINTBUFFER,
2578 .index = -1,
2579};
2580#endif
2581
2582/*
2583 * Handling of Linux-specific VC ioctls
2584 */
2585
2586/*
ac751efa 2587 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2588 *
2589 * There are some functions which don't need it.
2590 *
2591 * There are some functions which can sleep for arbitrary periods
2592 * (paste_selection) but we don't need the lock there anyway.
2593 *
2594 * set_selection has locking, and definitely needs it
2595 */
2596
2597int tioclinux(struct tty_struct *tty, unsigned long arg)
2598{
2599 char type, data;
2600 char __user *p = (char __user *)arg;
2601 int lines;
2602 int ret;
2603
1da177e4
LT		 2604 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2605 return -EPERM;
2606 if (get_user(type, p))
2607 return -EFAULT;
2608 ret = 0;
04f378b1 2609
1da177e4
LT		 2610 switch (type)
2611 {
2612 case TIOCL_SETSEL:
ac751efa 2613 console_lock();
1da177e4 2614 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2615 console_unlock();
1da177e4
LT		 2616 break;
2617 case TIOCL_PASTESEL:
2618 ret = paste_selection(tty);
2619 break;
2620 case TIOCL_UNBLANKSCREEN:
ac751efa 2621 console_lock();
1da177e4 2622 unblank_screen();
ac751efa 2623 console_unlock();
1da177e4
LT		 2624 break;
2625 case TIOCL_SELLOADLUT:
2626 ret = sel_loadlut(p);
2627 break;
2628 case TIOCL_GETSHIFTSTATE:
04f378b1 2629
1da177e4
LT		 2630 /*
2631 * Make it possible to react to Shift+Mousebutton.
2632 * Note that 'shift_state' is an undocumented
2633 * kernel-internal variable; programs not closely
2634 * related to the kernel should not use this.
2635 */
079c9534 2636 data = vt_get_shift_state();
1da177e4
LT		 2637 ret = __put_user(data, p);
2638 break;
2639 case TIOCL_GETMOUSEREPORTING:
2640 data = mouse_reporting();
2641 ret = __put_user(data, p);
2642 break;
2643 case TIOCL_SETVESABLANK:
403aac96 2644 ret = set_vesa_blanking(p);
1da177e4 2645 break;
0ca07731 2646 case TIOCL_GETKMSGREDIRECT:
5ada918b 2647 data = vt_get_kmsg_redirect();
0ca07731
RW		 2648 ret = __put_user(data, p);
2649 break;
1da177e4
LT		 2650 case TIOCL_SETKMSGREDIRECT:
2651 if (!capable(CAP_SYS_ADMIN)) {
2652 ret = -EPERM;
2653 } else {
2654 if (get_user(data, p+1))
2655 ret = -EFAULT;
2656 else
5ada918b 2657 vt_kmsg_redirect(data);
1da177e4
LT		 2658 }
2659 break;
2660 case TIOCL_GETFGCONSOLE:
2661 ret = fg_console;
2662 break;
2663 case TIOCL_SCROLLCONSOLE:
2664 if (get_user(lines, (s32 __user *)(p+4))) {
2665 ret = -EFAULT;
2666 } else {
2667 scrollfront(vc_cons[fg_console].d, lines);
2668 ret = 0;
2669 }
2670 break;
2671 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2672 console_lock();
1da177e4
LT		 2673 ignore_poke = 1;
2674 do_blank_screen(0);
ac751efa 2675 console_unlock();
1da177e4
LT		 2676 break;
2677 case TIOCL_BLANKEDSCREEN:
2678 ret = console_blanked;
2679 break;
2680 default:
2681 ret = -EINVAL;
2682 break;
2683 }
2684 return ret;
2685}
2686
2687/*
2688 * /dev/ttyN handling
2689 */
2690
2691static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2692{
2693 int retval;
2694
2695 retval = do_con_write(tty, buf, count);
2696 con_flush_chars(tty);
2697
2698 return retval;
2699}
2700
5d19f546 2701static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2702{
2703 if (in_interrupt())
5d19f546
AC		 2704 return 0; /* n_r3964 calls put_char() from interrupt context */
2705 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2706}
2707
2708static int con_write_room(struct tty_struct *tty)
2709{
2710 if (tty->stopped)
2711 return 0;
a88a69c9 2712 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2713}
2714
2715static int con_chars_in_buffer(struct tty_struct *tty)
2716{
2717 return 0; /* we're not buffering */
2718}
2719
2720/*
2721 * con_throttle and con_unthrottle are only used for
2722 * paste_selection(), which has to stuff in a large number of
2723 * characters...
2724 */
2725static void con_throttle(struct tty_struct *tty)
2726{
2727}
2728
2729static void con_unthrottle(struct tty_struct *tty)
2730{
2731 struct vc_data *vc = tty->driver_data;
2732
2733 wake_up_interruptible(&vc->paste_wait);
2734}
2735
2736/*
2737 * Turn the Scroll-Lock LED on when the tty is stopped
2738 */
2739static void con_stop(struct tty_struct *tty)
2740{
2741 int console_num;
2742 if (!tty)
2743 return;
2744 console_num = tty->index;
2745 if (!vc_cons_allocated(console_num))
2746 return;
079c9534 2747 vt_kbd_con_stop(console_num);
1da177e4
LT		 2748}
2749
2750/*
2751 * Turn the Scroll-Lock LED off when the console is started
2752 */
2753static void con_start(struct tty_struct *tty)
2754{
2755 int console_num;
2756 if (!tty)
2757 return;
2758 console_num = tty->index;
2759 if (!vc_cons_allocated(console_num))
2760 return;
079c9534 2761 vt_kbd_con_start(console_num);
1da177e4
LT		 2762}
2763
2764static void con_flush_chars(struct tty_struct *tty)
2765{
2766 struct vc_data *vc;
2767
2768 if (in_interrupt()) /* from flush_to_ldisc */
2769 return;
2770
2771 /* if we race with con_close(), vt may be null */
ac751efa 2772 console_lock();
1da177e4
LT		 2773 vc = tty->driver_data;
2774 if (vc)
2775 set_cursor(vc);
ac751efa 2776 console_unlock();
1da177e4
LT		 2777}
2778
2779/*
2780 * Allocate the console screen memory.
2781 */
2782static int con_open(struct tty_struct *tty, struct file *filp)
2783{
2784 unsigned int currcons = tty->index;
2785 int ret = 0;
2786
ac751efa 2787 console_lock();
f786648b 2788 if (tty->driver_data == NULL) {
1da177e4
LT		 2789 ret = vc_allocate(currcons);
2790 if (ret == 0) {
2791 struct vc_data *vc = vc_cons[currcons].d;
feebed65
AC		 2792
2793 /* Still being freed */
8ce73264 2794 if (vc->port.tty) {
ac751efa 2795 console_unlock();
feebed65
AC		 2796 return -ERESTARTSYS;
2797 }
1da177e4 2798 tty->driver_data = vc;
8ce73264 2799 vc->port.tty = tty;
1da177e4
LT		 2800
2801 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2802 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2803 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2804 }
c1236d31
ST		 2805 if (vc->vc_utf)
2806 tty->termios->c_iflag |= IUTF8;
2807 else
2808 tty->termios->c_iflag &= ~IUTF8;
ac751efa 2809 console_unlock();
1da177e4
LT		 2810 return ret;
2811 }
2812 }
ac751efa 2813 console_unlock();
1da177e4
LT		 2814 return ret;
2815}
2816
1da177e4
LT		 2817static void con_close(struct tty_struct *tty, struct file *filp)
2818{
feebed65
AC		 2819 /* Nothing to do - we defer to shutdown */
2820}
1da177e4 2821
feebed65
AC		 2822static void con_shutdown(struct tty_struct *tty)
2823{
2824 struct vc_data *vc = tty->driver_data;
2825 BUG_ON(vc == NULL);
ac751efa 2826 console_lock();
8ce73264 2827 vc->port.tty = NULL;
ac751efa 2828 console_unlock();
feebed65 2829 tty_shutdown(tty);
1da177e4
LT		 2830}
2831
fa6ce9ab
JE		 2832static int default_italic_color = 2; // green (ASCII)
2833static int default_underline_color = 3; // cyan (ASCII)
2834module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2835module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2836
1da177e4
LT		 2837static void vc_init(struct vc_data *vc, unsigned int rows,
2838 unsigned int cols, int do_clear)
2839{
2840 int j, k ;
2841
2842 vc->vc_cols = cols;
2843 vc->vc_rows = rows;
2844 vc->vc_size_row = cols << 1;
2845 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2846
2847 set_origin(vc);
2848 vc->vc_pos = vc->vc_origin;
2849 reset_vc(vc);
2850 for (j=k=0; j<16; j++) {
2851 vc->vc_palette[k++] = default_red[j] ;
2852 vc->vc_palette[k++] = default_grn[j] ;
2853 vc->vc_palette[k++] = default_blu[j] ;
2854 }
2855 vc->vc_def_color = 0x07; /* white */
fa6ce9ab
JE		 2856 vc->vc_ulcolor = default_underline_color;
2857 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2858 vc->vc_halfcolor = 0x08; /* grey */
2859 init_waitqueue_head(&vc->paste_wait);
2860 reset_terminal(vc, do_clear);
2861}
2862
2863/*
2864 * This routine initializes console interrupts, and does nothing
2865 * else. If you want the screen to clear, call tty_write with
2866 * the appropriate escape-sequence.
2867 */
2868
2869static int __init con_init(void)
2870{
2871 const char *display_desc = NULL;
2872 struct vc_data *vc;
3e795de7 2873 unsigned int currcons = 0, i;
1da177e4 2874
ac751efa 2875 console_lock();
1da177e4
LT		 2876
2877 if (conswitchp)
2878 display_desc = conswitchp->con_startup();
2879 if (!display_desc) {
2880 fg_console = 0;
ac751efa 2881 console_unlock();
1da177e4
LT		 2882 return 0;
2883 }
2884
3e795de7
AD		 2885 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2886 struct con_driver *con_driver = &registered_con_driver[i];
2887
2888 if (con_driver->con == NULL) {
2889 con_driver->con = conswitchp;
2890 con_driver->desc = display_desc;
2891 con_driver->flag = CON_DRIVER_FLAG_INIT;
2892 con_driver->first = 0;
2893 con_driver->last = MAX_NR_CONSOLES - 1;
2894 break;
2895 }
2896 }
2897
2898 for (i = 0; i < MAX_NR_CONSOLES; i++)
2899 con_driver_map[i] = conswitchp;
2900
1da177e4
LT		 2901 if (blankinterval) {
2902 blank_state = blank_normal_wait;
f324edc8 2903 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2904 }
2905
1da177e4 2906 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2907 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2908 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 2909 tty_port_init(&vc->port);
1da177e4 2910 visual_init(vc, currcons, 1);
a5f4f52e 2911 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 2912 vc_init(vc, vc->vc_rows, vc->vc_cols,
2913 currcons || !vc->vc_sw->con_save_screen);
2914 }
2915 currcons = fg_console = 0;
2916 master_display_fg = vc = vc_cons[currcons].d;
2917 set_origin(vc);
2918 save_screen(vc);
2919 gotoxy(vc, vc->vc_x, vc->vc_y);
2920 csi_J(vc, 0);
2921 update_screen(vc);
1ffdda95 2922 pr_info("Console: %s %s %dx%d",
1da177e4
LT		 2923 vc->vc_can_do_color ? "colour" : "mono",
2924 display_desc, vc->vc_cols, vc->vc_rows);
2925 printable = 1;
2926 printk("\n");
2927
ac751efa 2928 console_unlock();
1da177e4
LT		 2929
2930#ifdef CONFIG_VT_CONSOLE
2931 register_console(&vt_console_driver);
2932#endif
2933 return 0;
2934}
2935console_initcall(con_init);
2936
b68e31d0 2937static const struct tty_operations con_ops = {
1da177e4
LT		 2938 .open = con_open,
2939 .close = con_close,
2940 .write = con_write,
2941 .write_room = con_write_room,
2942 .put_char = con_put_char,
2943 .flush_chars = con_flush_chars,
2944 .chars_in_buffer = con_chars_in_buffer,
2945 .ioctl = vt_ioctl,
e9216651
AB		 2946#ifdef CONFIG_COMPAT
2947 .compat_ioctl = vt_compat_ioctl,
2948#endif
1da177e4
LT		 2949 .stop = con_stop,
2950 .start = con_start,
2951 .throttle = con_throttle,
2952 .unthrottle = con_unthrottle,
8c9a9dd0 2953 .resize = vt_resize,
feebed65 2954 .shutdown = con_shutdown
1da177e4
LT		 2955};
2956
d81ed103
AC		 2957static struct cdev vc0_cdev;
2958
fbc92a34
KS		 2959static ssize_t show_tty_active(struct device *dev,
2960 struct device_attribute *attr, char *buf)
2961{
2962 return sprintf(buf, "tty%d\n", fg_console + 1);
2963}
2964static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2965
d81ed103 2966int __init vty_init(const struct file_operations *console_fops)
1da177e4 2967{
d81ed103
AC		 2968 cdev_init(&vc0_cdev, console_fops);
2969 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2970 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2971 panic("Couldn't register /dev/tty0 driver\n");
fbc92a34
KS		 2972 tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2973 if (IS_ERR(tty0dev))
2974 tty0dev = NULL;
2975 else
a2a6a822 2976 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
d81ed103 2977
1da177e4
LT		 2978 vcs_init();
2979
2980 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2981 if (!console_driver)
2982 panic("Couldn't allocate console driver\n");
2983 console_driver->owner = THIS_MODULE;
1da177e4
LT		 2984 console_driver->name = "tty";
2985 console_driver->name_base = 1;
2986 console_driver->major = TTY_MAJOR;
2987 console_driver->minor_start = 1;
2988 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2989 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 2990 if (default_utf8)
2991 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 2992 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2993 tty_set_operations(console_driver, &con_ops);
2994 if (tty_register_driver(console_driver))
2995 panic("Couldn't register console driver\n");
1da177e4
LT		 2996 kbd_init();
2997 console_map_init();
1da177e4
LT		 2998#ifdef CONFIG_MDA_CONSOLE
2999 mda_console_init();
3000#endif
3001 return 0;
3002}
3003
3004#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3005
3006static struct class *vtconsole_class;
3007
b7269dd2
JB		 3008static int bind_con_driver(const struct consw *csw, int first, int last,
3009 int deflt)
1da177e4 3010{
3e795de7
AD		 3011 struct module *owner = csw->owner;
3012 const char *desc = NULL;
3013 struct con_driver *con_driver;
3014 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3015
1da177e4
LT		 3016 if (!try_module_get(owner))
3017 return -ENODEV;
3018
ac751efa 3019 console_lock();
1c8ce271 3020
3e795de7
AD		 3021 /* check if driver is registered */
3022 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3023 con_driver = &registered_con_driver[i];
3024
3025 if (con_driver->con == csw) {
3026 desc = con_driver->desc;
3027 retval = 0;
3028 break;
3029 }
3030 }
3031
3032 if (retval)
3033 goto err;
3034
3035 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3036 csw->con_startup();
3037 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3038 }
1c8ce271 3039
1da177e4
LT		 3040 if (deflt) {
3041 if (conswitchp)
3042 module_put(conswitchp->owner);
1c8ce271 3043
1da177e4
LT		 3044 __module_get(owner);
3045 conswitchp = csw;
3046 }
3047
3e795de7
AD		 3048 first = max(first, con_driver->first);
3049 last = min(last, con_driver->last);
3050
1da177e4
LT		 3051 for (i = first; i <= last; i++) {
3052 int old_was_color;
3053 struct vc_data *vc = vc_cons[i].d;
3054
3055 if (con_driver_map[i])
3056 module_put(con_driver_map[i]->owner);
3057 __module_get(owner);
3058 con_driver_map[i] = csw;
3059
3060 if (!vc || !vc->vc_sw)
3061 continue;
3062
3063 j = i;
1c8ce271 3064
4ee1acce
DH		 3065 if (CON_IS_VISIBLE(vc)) {
3066 k = i;
1da177e4 3067 save_screen(vc);
4ee1acce
DH		 3068 }
3069
1da177e4
LT		 3070 old_was_color = vc->vc_can_do_color;
3071 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3072 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3073 visual_init(vc, i, 0);
1c8ce271 3074 set_origin(vc);
1da177e4
LT		 3075 update_attr(vc);
3076
3077 /* If the console changed between mono <-> color, then
3078 * the attributes in the screenbuf will be wrong. The
3079 * following resets all attributes to something sane.
3080 */
3081 if (old_was_color != vc->vc_can_do_color)
3082 clear_buffer_attributes(vc);
1da177e4 3083 }
4ee1acce 3084
1ffdda95 3085 pr_info("Console: switching ");
1da177e4
LT		 3086 if (!deflt)
3087 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3088 if (j >= 0) {
3089 struct vc_data *vc = vc_cons[j].d;
3090
1da177e4 3091 printk("to %s %s %dx%d\n",
4ee1acce
DH		 3092 vc->vc_can_do_color ? "colour" : "mono",
3093 desc, vc->vc_cols, vc->vc_rows);
3094
3095 if (k >= 0) {
3096 vc = vc_cons[k].d;
3097 update_screen(vc);
3098 }
3099 } else
1da177e4
LT		 3100 printk("to %s\n", desc);
3101
3e795de7
AD		 3102 retval = 0;
3103err:
ac751efa 3104 console_unlock();
1da177e4 3105 module_put(owner);
3e795de7
AD		 3106 return retval;
3107};
1da177e4 3108
13ae6645
AD		 3109#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3110static int con_is_graphics(const struct consw *csw, int first, int last)
3111{
3112 int i, retval = 0;
3113
3114 for (i = first; i <= last; i++) {
3115 struct vc_data *vc = vc_cons[i].d;
3116
3117 if (vc && vc->vc_mode == KD_GRAPHICS) {
3118 retval = 1;
3119 break;
3120 }
3121 }
3122
3123 return retval;
3124}
3125
b7269dd2
JB		 3126/**
3127 * unbind_con_driver - unbind a console driver
3128 * @csw: pointer to console driver to unregister
3129 * @first: first in range of consoles that @csw should be unbound from
3130 * @last: last in range of consoles that @csw should be unbound from
3131 * @deflt: should next bound console driver be default after @csw is unbound?
3132 *
3133 * To unbind a driver from all possible consoles, pass 0 as @first and
3134 * %MAX_NR_CONSOLES as @last.
3135 *
3136 * @deflt controls whether the console that ends up replacing @csw should be
3137 * the default console.
3138 *
3139 * RETURNS:
3140 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3141 * or 0 on success.
3142 */
623e71b0 3143int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3144{
3e795de7
AD		 3145 struct module *owner = csw->owner;
3146 const struct consw *defcsw = NULL;
3147 struct con_driver *con_driver = NULL, *con_back = NULL;
3148 int i, retval = -ENODEV;
1da177e4 3149
3e795de7
AD		 3150 if (!try_module_get(owner))
3151 return -ENODEV;
3152
ac751efa 3153 console_lock();
3e795de7
AD		 3154
3155 /* check if driver is registered and if it is unbindable */
3156 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3157 con_driver = &registered_con_driver[i];
3158
3159 if (con_driver->con == csw &&
6db4063c 3160 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3161 retval = 0;
3162 break;
3163 }
3164 }
3165
3166 if (retval) {
ac751efa 3167 console_unlock();
3e795de7
AD		 3168 goto err;
3169 }
3170
6db4063c
AD		 3171 retval = -ENODEV;
3172
3e795de7
AD		 3173 /* check if backup driver exists */
3174 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3175 con_back = &registered_con_driver[i];
3176
3177 if (con_back->con &&
6db4063c 3178 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3e795de7
AD		 3179 defcsw = con_back->con;
3180 retval = 0;
3181 break;
3182 }
3183 }
3184
3185 if (retval) {
ac751efa 3186 console_unlock();
3e795de7
AD		 3187 goto err;
3188 }
3189
3190 if (!con_is_bound(csw)) {
ac751efa 3191 console_unlock();
3e795de7
AD		 3192 goto err;
3193 }
3194
3195 first = max(first, con_driver->first);
3196 last = min(last, con_driver->last);
3197
3198 for (i = first; i <= last; i++) {
1da177e4
LT		 3199 if (con_driver_map[i] == csw) {
3200 module_put(csw->owner);
3201 con_driver_map[i] = NULL;
3202 }
3e795de7
AD		 3203 }
3204
3205 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3206 const struct consw *defconsw = conswitchp;
3207
3e795de7
AD		 3208 defcsw->con_startup();
3209 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3210 /*
3211 * vgacon may change the default driver to point
3212 * to dummycon, we restore it here...
3213 */
3214 conswitchp = defconsw;
3e795de7
AD		 3215 }
3216
3217 if (!con_is_bound(csw))
3218 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3219
ac751efa 3220 console_unlock();
6db4063c
AD		 3221 /* ignore return value, binding should not fail */
3222 bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3223err:
3224 module_put(owner);
3225 return retval;
3226
3227}
623e71b0 3228EXPORT_SYMBOL(unbind_con_driver);
3e795de7 3229
6db4063c
AD		 3230static int vt_bind(struct con_driver *con)
3231{
3232 const struct consw *defcsw = NULL, *csw = NULL;
3233 int i, more = 1, first = -1, last = -1, deflt = 0;
3234
3235 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3236 con_is_graphics(con->con, con->first, con->last))
3237 goto err;
3238
3239 csw = con->con;
3240
3241 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3242 struct con_driver *con = &registered_con_driver[i];
3243
3244 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3245 defcsw = con->con;
3246 break;
3247 }
3248 }
3249
3250 if (!defcsw)
3251 goto err;
3252
3253 while (more) {
3254 more = 0;
3255
3256 for (i = con->first; i <= con->last; i++) {
3257 if (con_driver_map[i] == defcsw) {
3258 if (first == -1)
3259 first = i;
3260 last = i;
3261 more = 1;
3262 } else if (first != -1)
3263 break;
3264 }
3265
3266 if (first == 0 && last == MAX_NR_CONSOLES -1)
3267 deflt = 1;
3268
3269 if (first != -1)
3270 bind_con_driver(csw, first, last, deflt);
3271
3272 first = -1;
3273 last = -1;
3274 deflt = 0;
3275 }
3276
3277err:
3278 return 0;
3279}
3280
3281static int vt_unbind(struct con_driver *con)
3282{
3283 const struct consw *csw = NULL;
3284 int i, more = 1, first = -1, last = -1, deflt = 0;
3285
3286 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3287 con_is_graphics(con->con, con->first, con->last))
3288 goto err;
3289
3290 csw = con->con;
3291
3292 while (more) {
3293 more = 0;
3294
3295 for (i = con->first; i <= con->last; i++) {
3296 if (con_driver_map[i] == csw) {
3297 if (first == -1)
3298 first = i;
3299 last = i;
3300 more = 1;
3301 } else if (first != -1)
3302 break;
3303 }
3304
3305 if (first == 0 && last == MAX_NR_CONSOLES -1)
3306 deflt = 1;
3307
3308 if (first != -1)
3309 unbind_con_driver(csw, first, last, deflt);
3310
3311 first = -1;
3312 last = -1;
3313 deflt = 0;
3314 }
3315
3316err:
3317 return 0;
3318}
13ae6645
AD		 3319#else
3320static inline int vt_bind(struct con_driver *con)
3321{
3322 return 0;
3323}
3324static inline int vt_unbind(struct con_driver *con)
3325{
3326 return 0;
3327}
3328#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3329
805952a8 3330static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3331 const char *buf, size_t count)
3332{
805952a8 3333 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3334 int bind = simple_strtoul(buf, NULL, 0);
3335
3336 if (bind)
3337 vt_bind(con);
3338 else
3339 vt_unbind(con);
3340
3341 return count;
3342}
3343
805952a8
GKH		 3344static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3345 char *buf)
6db4063c 3346{
805952a8 3347 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3348 int bind = con_is_bound(con->con);
3349
3350 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3351}
3352
805952a8
GKH		 3353static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3354 char *buf)
6db4063c 3355{
805952a8 3356 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3357
3358 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3359 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3360 con->desc);
3361
3362}
3363
805952a8 3364static struct device_attribute device_attrs[] = {
6db4063c
AD		 3365 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3366 __ATTR(name, S_IRUGO, show_name, NULL),
3367};
3368
805952a8 3369static int vtconsole_init_device(struct con_driver *con)
6db4063c
AD		 3370{
3371 int i;
928e964f 3372 int error = 0;
6db4063c 3373
928e964f 3374 con->flag |= CON_DRIVER_FLAG_ATTR;
805952a8
GKH		 3375 dev_set_drvdata(con->dev, con);
3376 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3377 error = device_create_file(con->dev, &device_attrs[i]);
928e964f
AD		 3378 if (error)
3379 break;
3380 }
6db4063c 3381
928e964f
AD		 3382 if (error) {
3383 while (--i >= 0)
805952a8 3384 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3385 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3386 }
3387
3388 return error;
6db4063c
AD		 3389}
3390
805952a8 3391static void vtconsole_deinit_device(struct con_driver *con)
6db4063c
AD		 3392{
3393 int i;
3394
928e964f 3395 if (con->flag & CON_DRIVER_FLAG_ATTR) {
805952a8
GKH		 3396 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3397 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3398 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3399 }
6db4063c
AD		 3400}
3401
3e795de7
AD		 3402/**
3403 * con_is_bound - checks if driver is bound to the console
3404 * @csw: console driver
3405 *
3406 * RETURNS: zero if unbound, nonzero if bound
3407 *
3408 * Drivers can call this and if zero, they should release
3409 * all resources allocated on con_startup()
3410 */
3411int con_is_bound(const struct consw *csw)
3412{
3413 int i, bound = 0;
3414
3415 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3416 if (con_driver_map[i] == csw) {
3417 bound = 1;
3418 break;
3419 }
3420 }
3421
3422 return bound;
3423}
3424EXPORT_SYMBOL(con_is_bound);
3425
b45cfba4
JB		 3426/**
3427 * con_debug_enter - prepare the console for the kernel debugger
3428 * @sw: console driver
3429 *
3430 * Called when the console is taken over by the kernel debugger, this
3431 * function needs to save the current console state, then put the console
3432 * into a state suitable for the kernel debugger.
3433 *
3434 * RETURNS:
3435 * Zero on success, nonzero if a failure occurred when trying to prepare
3436 * the console for the debugger.
3437 */
3438int con_debug_enter(struct vc_data *vc)
3439{
3440 int ret = 0;
3441
3442 saved_fg_console = fg_console;
3443 saved_last_console = last_console;
3444 saved_want_console = want_console;
3445 saved_vc_mode = vc->vc_mode;
beed5336 3446 saved_console_blanked = console_blanked;
b45cfba4
JB		 3447 vc->vc_mode = KD_TEXT;
3448 console_blanked = 0;
3449 if (vc->vc_sw->con_debug_enter)
3450 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3451#ifdef CONFIG_KGDB_KDB
3452 /* Set the initial LINES variable if it is not already set */
3453 if (vc->vc_rows < 999) {
3454 int linecount;
3455 char lns[4];
3456 const char *setargs[3] = {
3457 "set",
3458 "LINES",
3459 lns,
3460 };
3461 if (kdbgetintenv(setargs[0], &linecount)) {
3462 snprintf(lns, 4, "%i", vc->vc_rows);
3463 kdb_set(2, setargs);
3464 }
3465 }
3466#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3467 return ret;
3468}
3469EXPORT_SYMBOL_GPL(con_debug_enter);
3470
3471/**
3472 * con_debug_leave - restore console state
3473 * @sw: console driver
3474 *
3475 * Restore the console state to what it was before the kernel debugger
3476 * was invoked.
3477 *
3478 * RETURNS:
3479 * Zero on success, nonzero if a failure occurred when trying to restore
3480 * the console.
3481 */
3482int con_debug_leave(void)
3483{
3484 struct vc_data *vc;
3485 int ret = 0;
3486
3487 fg_console = saved_fg_console;
3488 last_console = saved_last_console;
3489 want_console = saved_want_console;
beed5336 3490 console_blanked = saved_console_blanked;
b45cfba4
JB		 3491 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3492
3493 vc = vc_cons[fg_console].d;
3494 if (vc->vc_sw->con_debug_leave)
3495 ret = vc->vc_sw->con_debug_leave(vc);
3496 return ret;
3497}
3498EXPORT_SYMBOL_GPL(con_debug_leave);
3499
3e795de7
AD		 3500/**
3501 * register_con_driver - register console driver to console layer
3502 * @csw: console driver
3503 * @first: the first console to take over, minimum value is 0
3504 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3505 *
3506 * DESCRIPTION: This function registers a console driver which can later
3507 * bind to a range of consoles specified by @first and @last. It will
3508 * also initialize the console driver by calling con_startup().
3509 */
3510int register_con_driver(const struct consw *csw, int first, int last)
3511{
3512 struct module *owner = csw->owner;
3513 struct con_driver *con_driver;
3514 const char *desc;
3515 int i, retval = 0;
3516
3517 if (!try_module_get(owner))
3518 return -ENODEV;
3519
ac751efa 3520 console_lock();
3e795de7
AD		 3521
3522 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3523 con_driver = &registered_con_driver[i];
3524
3525 /* already registered */
3526 if (con_driver->con == csw)
c55c63c6 3527 retval = -EBUSY;
3e795de7
AD		 3528 }
3529
3530 if (retval)
3531 goto err;
3532
3533 desc = csw->con_startup();
3534
3535 if (!desc)
3536 goto err;
3537
3538 retval = -EINVAL;
3539
3540 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3541 con_driver = &registered_con_driver[i];
3542
3543 if (con_driver->con == NULL) {
3544 con_driver->con = csw;
3545 con_driver->desc = desc;
6db4063c
AD		 3546 con_driver->node = i;
3547 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3548 CON_DRIVER_FLAG_INIT;
3549 con_driver->first = first;
3550 con_driver->last = last;
3551 retval = 0;
3552 break;
3553 }
3554 }
3555
6db4063c
AD		 3556 if (retval)
3557 goto err;
3558
d81ed103 3559 con_driver->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3560 MKDEV(0, con_driver->node),
3561 NULL, "vtcon%i",
3562 con_driver->node);
6db4063c 3563
805952a8
GKH		 3564 if (IS_ERR(con_driver->dev)) {
3565 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3566 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3567 PTR_ERR(con_driver->dev));
3568 con_driver->dev = NULL;
6db4063c 3569 } else {
805952a8 3570 vtconsole_init_device(con_driver);
6db4063c 3571 }
928e964f 3572
3e795de7 3573err:
ac751efa 3574 console_unlock();
3e795de7
AD		 3575 module_put(owner);
3576 return retval;
3577}
3578EXPORT_SYMBOL(register_con_driver);
3579
3580/**
3581 * unregister_con_driver - unregister console driver from console layer
3582 * @csw: console driver
3583 *
3584 * DESCRIPTION: All drivers that registers to the console layer must
3585 * call this function upon exit, or if the console driver is in a state
3586 * where it won't be able to handle console services, such as the
3587 * framebuffer console without loaded framebuffer drivers.
3588 *
3589 * The driver must unbind first prior to unregistration.
3590 */
3591int unregister_con_driver(const struct consw *csw)
3592{
3593 int i, retval = -ENODEV;
3594
ac751efa 3595 console_lock();
3e795de7
AD		 3596
3597 /* cannot unregister a bound driver */
3598 if (con_is_bound(csw))
3599 goto err;
3600
3601 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3602 struct con_driver *con_driver = &registered_con_driver[i];
3603
3604 if (con_driver->con == csw &&
6db4063c 3605 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
805952a8
GKH		 3606 vtconsole_deinit_device(con_driver);
3607 device_destroy(vtconsole_class,
3608 MKDEV(0, con_driver->node));
3e795de7
AD		 3609 con_driver->con = NULL;
3610 con_driver->desc = NULL;
805952a8 3611 con_driver->dev = NULL;
6db4063c 3612 con_driver->node = 0;
3e795de7
AD		 3613 con_driver->flag = 0;
3614 con_driver->first = 0;
3615 con_driver->last = 0;
3616 retval = 0;
3617 break;
3618 }
3619 }
3e795de7 3620err:
ac751efa 3621 console_unlock();
3e795de7
AD		 3622 return retval;
3623}
3624EXPORT_SYMBOL(unregister_con_driver);
3625
3626/*
3627 * If we support more console drivers, this function is used
3628 * when a driver wants to take over some existing consoles
3629 * and become default driver for newly opened ones.
3630 *
3631 * take_over_console is basically a register followed by unbind
3632 */
3633int take_over_console(const struct consw *csw, int first, int last, int deflt)
3634{
3635 int err;
3636
3637 err = register_con_driver(csw, first, last);
c55c63c6
DA		 3638 /* if we get an busy error we still want to bind the console driver
3639 * and return success, as we may have unbound the console driver
3640  * but not unregistered it.
3641 */
3642 if (err == -EBUSY)
3643 err = 0;
3e795de7 3644 if (!err)
6db4063c 3645 bind_con_driver(csw, first, last, deflt);
3e795de7
AD		 3646
3647 return err;
3648}
3649
3650/*
3651 * give_up_console is a wrapper to unregister_con_driver. It will only
3652 * work if driver is fully unbound.
3653 */
3654void give_up_console(const struct consw *csw)
3655{
3656 unregister_con_driver(csw);
3657}
3658
6db4063c 3659static int __init vtconsole_class_init(void)
3e795de7 3660{
6db4063c 3661 int i;
3e795de7 3662
6db4063c
AD		 3663 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3664 if (IS_ERR(vtconsole_class)) {
3665 printk(KERN_WARNING "Unable to create vt console class; "
3666 "errno = %ld\n", PTR_ERR(vtconsole_class));
3667 vtconsole_class = NULL;
3668 }
3e795de7 3669
6db4063c 3670 /* Add system drivers to sysfs */
3e795de7
AD		 3671 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3672 struct con_driver *con = &registered_con_driver[i];
3673
805952a8 3674 if (con->con && !con->dev) {
d81ed103 3675 con->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3676 MKDEV(0, con->node),
3677 NULL, "vtcon%i",
3678 con->node);
6db4063c 3679
805952a8 3680 if (IS_ERR(con->dev)) {
6db4063c 3681 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3682 "device for %s; errno = %ld\n",
3683 con->desc, PTR_ERR(con->dev));
3684 con->dev = NULL;
6db4063c 3685 } else {
805952a8 3686 vtconsole_init_device(con);
6db4063c 3687 }
3e795de7 3688 }
3e795de7
AD		 3689 }
3690
3e795de7
AD		 3691 return 0;
3692}
6db4063c 3693postcore_initcall(vtconsole_class_init);
3e795de7 3694
1da177e4
LT		 3695#endif
3696
3697/*
3698 * Screen blanking
3699 */
3700
403aac96 3701static int set_vesa_blanking(char __user *p)
1da177e4 3702{
403aac96
YY		 3703 unsigned int mode;
3704
3705 if (get_user(mode, p + 1))
3706 return -EFAULT;
3707
3708 vesa_blank_mode = (mode < 4) ? mode : 0;
3709 return 0;
1da177e4
LT		 3710}
3711
1da177e4
LT		 3712void do_blank_screen(int entering_gfx)
3713{
3714 struct vc_data *vc = vc_cons[fg_console].d;
3715 int i;
3716
3717 WARN_CONSOLE_UNLOCKED();
3718
3719 if (console_blanked) {
3720 if (blank_state == blank_vesa_wait) {
3721 blank_state = blank_off;
d060a321 3722 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3723 }
3724 return;
3725 }
1da177e4
LT		 3726
3727 /* entering graphics mode? */
3728 if (entering_gfx) {
3729 hide_cursor(vc);
3730 save_screen(vc);
3731 vc->vc_sw->con_blank(vc, -1, 1);
3732 console_blanked = fg_console + 1;
b6e8f00f 3733 blank_state = blank_off;
1da177e4
LT		 3734 set_origin(vc);
3735 return;
3736 }
3737
b6e8f00f 3738 if (blank_state != blank_normal_wait)
3739 return;
3740 blank_state = blank_off;
3741
1da177e4
LT		 3742 /* don't blank graphics */
3743 if (vc->vc_mode != KD_TEXT) {
3744 console_blanked = fg_console + 1;
3745 return;
3746 }
3747
3748 hide_cursor(vc);
3749 del_timer_sync(&console_timer);
3750 blank_timer_expired = 0;
3751
3752 save_screen(vc);
3753 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3754 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3755 console_blanked = fg_console + 1;
3756 if (i)
3757 set_origin(vc);
3758
3759 if (console_blank_hook && console_blank_hook(1))
3760 return;
3761
d060a321 3762 if (vesa_off_interval && vesa_blank_mode) {
030babac 3763 blank_state = blank_vesa_wait;
1da177e4
LT		 3764 mod_timer(&console_timer, jiffies + vesa_off_interval);
3765 }
8b92e87d 3766 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3767}
3768EXPORT_SYMBOL(do_blank_screen);
3769
3770/*
3771 * Called by timer as well as from vt_console_driver
3772 */
3773void do_unblank_screen(int leaving_gfx)
3774{
3775 struct vc_data *vc;
3776
3777 /* This should now always be called from a "sane" (read: can schedule)
3778 * context for the sake of the low level drivers, except in the special
3779 * case of oops_in_progress
3780 */
3781 if (!oops_in_progress)
3782 might_sleep();
3783
3784 WARN_CONSOLE_UNLOCKED();
3785
3786 ignore_poke = 0;
3787 if (!console_blanked)
3788 return;
3789 if (!vc_cons_allocated(fg_console)) {
3790 /* impossible */
1ffdda95
MSB		 3791 pr_warning("unblank_screen: tty %d not allocated ??\n",
3792 fg_console+1);
1da177e4
LT		 3793 return;
3794 }
3795 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3796 /* Try to unblank in oops case too */
3797 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3798 return; /* but leave console_blanked != 0 */
3799
3800 if (blankinterval) {
f324edc8 3801 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3802 blank_state = blank_normal_wait;
3803 }
3804
3805 console_blanked = 0;
8fd4bd22 3806 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3807 /* Low-level driver cannot restore -> do it ourselves */
3808 update_screen(vc);
3809 if (console_blank_hook)
3810 console_blank_hook(0);
3811 set_palette(vc);
3812 set_cursor(vc);
8b92e87d 3813 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3814}
3815EXPORT_SYMBOL(do_unblank_screen);
3816
3817/*
3818 * This is called by the outside world to cause a forced unblank, mostly for
3819 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3820 * call it with 1 as an argument and so force a mode restore... that may kill
3821 * X or at least garbage the screen but would also make the Oops visible...
3822 */
3823void unblank_screen(void)
3824{
3825 do_unblank_screen(0);
3826}
3827
3828/*
70522e12 3829 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3830 * (console operations can still happen at irq time, but only from printk which
70522e12 3831 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3832 */
3833static void blank_screen_t(unsigned long dummy)
3834{
cc63b1e1 3835 if (unlikely(!keventd_up())) {
f324edc8 3836 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3837 return;
3838 }
1da177e4
LT		 3839 blank_timer_expired = 1;
3840 schedule_work(&console_work);
3841}
3842
3843void poke_blanked_console(void)
3844{
3845 WARN_CONSOLE_UNLOCKED();
3846
3847 /* Add this so we quickly catch whoever might call us in a non
3848 * safe context. Nowadays, unblank_screen() isn't to be called in
3849 * atomic contexts and is allowed to schedule (with the special case
3850 * of oops_in_progress, but that isn't of any concern for this
3851 * function. --BenH.
3852 */
3853 might_sleep();
3854
3855 /* This isn't perfectly race free, but a race here would be mostly harmless,
3856 * at worse, we'll do a spurrious blank and it's unlikely
3857 */
3858 del_timer(&console_timer);
3859 blank_timer_expired = 0;
3860
3861 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3862 return;
3863 if (console_blanked)
3864 unblank_screen();
3865 else if (blankinterval) {
f324edc8 3866 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3867 blank_state = blank_normal_wait;
3868 }
3869}
3870
3871/*
3872 * Palettes
3873 */
3874
3875static void set_palette(struct vc_data *vc)
3876{
3877 WARN_CONSOLE_UNLOCKED();
3878
3879 if (vc->vc_mode != KD_GRAPHICS)
3880 vc->vc_sw->con_set_palette(vc, color_table);
3881}
3882
3883static int set_get_cmap(unsigned char __user *arg, int set)
3884{
3885 int i, j, k;
3886
3887 WARN_CONSOLE_UNLOCKED();
3888
3889 for (i = 0; i < 16; i++)
3890 if (set) {
3891 get_user(default_red[i], arg++);
3892 get_user(default_grn[i], arg++);
3893 get_user(default_blu[i], arg++);
3894 } else {
3895 put_user(default_red[i], arg++);
3896 put_user(default_grn[i], arg++);
3897 put_user(default_blu[i], arg++);
3898 }
3899 if (set) {
3900 for (i = 0; i < MAX_NR_CONSOLES; i++)
3901 if (vc_cons_allocated(i)) {
3902 for (j = k = 0; j < 16; j++) {
3903 vc_cons[i].d->vc_palette[k++] = default_red[j];
3904 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3905 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3906 }
3907 set_palette(vc_cons[i].d);
3908 }
3909 }
3910 return 0;
3911}
3912
3913/*
3914 * Load palette into the DAC registers. arg points to a colour
3915 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3916 */
3917
3918int con_set_cmap(unsigned char __user *arg)
3919{
3920 int rc;
3921
ac751efa 3922 console_lock();
1da177e4 3923 rc = set_get_cmap (arg,1);
ac751efa 3924 console_unlock();
1da177e4
LT		 3925
3926 return rc;
3927}
3928
3929int con_get_cmap(unsigned char __user *arg)
3930{
3931 int rc;
3932
ac751efa 3933 console_lock();
1da177e4 3934 rc = set_get_cmap (arg,0);
ac751efa 3935 console_unlock();
1da177e4
LT		 3936
3937 return rc;
3938}
3939
3940void reset_palette(struct vc_data *vc)
3941{
3942 int j, k;
3943 for (j=k=0; j<16; j++) {
3944 vc->vc_palette[k++] = default_red[j];
3945 vc->vc_palette[k++] = default_grn[j];
3946 vc->vc_palette[k++] = default_blu[j];
3947 }
3948 set_palette(vc);
3949}
3950
3951/*
3952 * Font switching
3953 *
3954 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3955 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3956 * depending on width) reserved for each character which is kinda wasty, but
3957 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 3958 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 3959 * format (maybe we should add a `fontoffset' field to the `display'
3960 * structure so we won't have to convert the fontdata all the time.
3961 * /Jes
3962 */
3963
3964#define max_font_size 65536
3965
3966static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3967{
3968 struct console_font font;
3969 int rc = -EINVAL;
3970 int c;
3971
1da177e4
LT		 3972 if (op->data) {
3973 font.data = kmalloc(max_font_size, GFP_KERNEL);
3974 if (!font.data)
3975 return -ENOMEM;
3976 } else
3977 font.data = NULL;
3978
ac751efa 3979 console_lock();
edab558f
AC		 3980 if (vc->vc_mode != KD_TEXT)
3981 rc = -EINVAL;
3982 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 3983 rc = vc->vc_sw->con_font_get(vc, &font);
3984 else
3985 rc = -ENOSYS;
ac751efa 3986 console_unlock();
1da177e4
LT		 3987
3988 if (rc)
3989 goto out;
3990
3991 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 3992
1da177e4
LT		 3993 if (op->data && font.charcount > op->charcount)
3994 rc = -ENOSPC;
3995 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3996 if (font.width > op->width || font.height > op->height)
3997 rc = -ENOSPC;
3998 } else {
3999 if (font.width != 8)
4000 rc = -EIO;
4001 else if ((op->height && font.height > op->height) ||
4002 font.height > 32)
4003 rc = -ENOSPC;
4004 }
4005 if (rc)
4006 goto out;
4007
4008 op->height = font.height;
4009 op->width = font.width;
4010 op->charcount = font.charcount;
4011
4012 if (op->data && copy_to_user(op->data, font.data, c))
4013 rc = -EFAULT;
4014
4015out:
4016 kfree(font.data);
4017 return rc;
4018}
4019
4020static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4021{
4022 struct console_font font;
4023 int rc = -EINVAL;
4024 int size;
4025
4026 if (vc->vc_mode != KD_TEXT)
4027 return -EINVAL;
4028 if (!op->data)
4029 return -EINVAL;
4030 if (op->charcount > 512)
4031 return -EINVAL;
4032 if (!op->height) { /* Need to guess font height [compat] */
4033 int h, i;
4034 u8 __user *charmap = op->data;
4035 u8 tmp;
4036
4037 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4038 so that we can get rid of this soon */
4039 if (!(op->flags & KD_FONT_FLAG_OLD))
4040 return -EINVAL;
4041 for (h = 32; h > 0; h--)
4042 for (i = 0; i < op->charcount; i++) {
4043 if (get_user(tmp, &charmap[32*i+h-1]))
4044 return -EFAULT;
4045 if (tmp)
4046 goto nonzero;
4047 }
4048 return -EINVAL;
4049 nonzero:
4050 op->height = h;
4051 }
4052 if (op->width <= 0 || op->width > 32 || op->height > 32)
4053 return -EINVAL;
4054 size = (op->width+7)/8 * 32 * op->charcount;
4055 if (size > max_font_size)
4056 return -ENOSPC;
4057 font.charcount = op->charcount;
4058 font.height = op->height;
4059 font.width = op->width;
9b71ca20
JL		 4060 font.data = memdup_user(op->data, size);
4061 if (IS_ERR(font.data))
4062 return PTR_ERR(font.data);
ac751efa 4063 console_lock();
edab558f
AC		 4064 if (vc->vc_mode != KD_TEXT)
4065 rc = -EINVAL;
4066 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4067 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4068 else
4069 rc = -ENOSYS;
ac751efa 4070 console_unlock();
1da177e4
LT		 4071 kfree(font.data);
4072 return rc;
4073}
4074
4075static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4076{
4077 struct console_font font = {.width = op->width, .height = op->height};
4078 char name[MAX_FONT_NAME];
4079 char *s = name;
4080 int rc;
4081
1da177e4
LT		 4082
4083 if (!op->data)
4084 s = NULL;
4085 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4086 return -EFAULT;
4087 else
4088 name[MAX_FONT_NAME - 1] = 0;
4089
ac751efa 4090 console_lock();
edab558f
AC		 4091 if (vc->vc_mode != KD_TEXT) {
4092 console_unlock();
4093 return -EINVAL;
4094 }
1da177e4
LT		 4095 if (vc->vc_sw->con_font_default)
4096 rc = vc->vc_sw->con_font_default(vc, &font, s);
4097 else
4098 rc = -ENOSYS;
ac751efa 4099 console_unlock();
1da177e4
LT		 4100 if (!rc) {
4101 op->width = font.width;
4102 op->height = font.height;
4103 }
4104 return rc;
4105}
4106
4107static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4108{
4109 int con = op->height;
4110 int rc;
4111
1da177e4 4112
ac751efa 4113 console_lock();
edab558f
AC		 4114 if (vc->vc_mode != KD_TEXT)
4115 rc = -EINVAL;
4116 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4117 rc = -ENOSYS;
4118 else if (con < 0 || !vc_cons_allocated(con))
4119 rc = -ENOTTY;
4120 else if (con == vc->vc_num) /* nothing to do */
4121 rc = 0;
4122 else
4123 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4124 console_unlock();
1da177e4
LT		 4125 return rc;
4126}
4127
4128int con_font_op(struct vc_data *vc, struct console_font_op *op)
4129{
4130 switch (op->op) {
4131 case KD_FONT_OP_SET:
4132 return con_font_set(vc, op);
4133 case KD_FONT_OP_GET:
4134 return con_font_get(vc, op);
4135 case KD_FONT_OP_SET_DEFAULT:
4136 return con_font_default(vc, op);
4137 case KD_FONT_OP_COPY:
4138 return con_font_copy(vc, op);
4139 }
4140 return -ENOSYS;
4141}
4142
4143/*
4144 * Interface exported to selection and vcs.
4145 */
4146
4147/* used by selection */
4148u16 screen_glyph(struct vc_data *vc, int offset)
4149{
4150 u16 w = scr_readw(screenpos(vc, offset, 1));
4151 u16 c = w & 0xff;
4152
4153 if (w & vc->vc_hi_font_mask)
4154 c |= 0x100;
4155 return c;
4156}
f7511d5f 4157EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4158
4159/* used by vcs - note the word offset */
4160unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4161{
4162 return screenpos(vc, 2 * w_offset, viewed);
4163}
4164
4165void getconsxy(struct vc_data *vc, unsigned char *p)
4166{
4167 p[0] = vc->vc_x;
4168 p[1] = vc->vc_y;
4169}
4170
4171void putconsxy(struct vc_data *vc, unsigned char *p)
4172{
9477e260 4173 hide_cursor(vc);
1da177e4
LT		 4174 gotoxy(vc, p[0], p[1]);
4175 set_cursor(vc);
4176}
4177
4178u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4179{
4180 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4181 return softcursor_original;
4182 return scr_readw(org);
4183}
4184
4185void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4186{
4187 scr_writew(val, org);
4188 if ((unsigned long)org == vc->vc_pos) {
4189 softcursor_original = -1;
4190 add_softcursor(vc);
4191 }
4192}
4193
432c9ed2
NP		 4194void vcs_scr_updated(struct vc_data *vc)
4195{
4196 notify_update(vc);
4197}
4198
1da177e4
LT		 4199/*
4200 * Visible symbols for modules
4201 */
4202
4203EXPORT_SYMBOL(color_table);
4204EXPORT_SYMBOL(default_red);
4205EXPORT_SYMBOL(default_grn);
4206EXPORT_SYMBOL(default_blu);
4207EXPORT_SYMBOL(update_region);
4208EXPORT_SYMBOL(redraw_screen);
4209EXPORT_SYMBOL(vc_resize);
4210EXPORT_SYMBOL(fg_console);
4211EXPORT_SYMBOL(console_blank_hook);
4212EXPORT_SYMBOL(console_blanked);
4213EXPORT_SYMBOL(vc_cons);
f6c06b68 4214EXPORT_SYMBOL(global_cursor_default);
1da177e4
LT		 4215#ifndef VT_SINGLE_DRIVER
4216EXPORT_SYMBOL(take_over_console);
4217EXPORT_SYMBOL(give_up_console);
4218#endif
kernel source for telekom puls (alcatel/mediatek)