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Merge branches 'pm-core', 'pm-clk', 'pm-domains' and 'pm-pci'
[deliverable/linux.git] / drivers / tty / vt / vt.c
CommitLineData
1da177e4 1/*
1da177e4
LT		 2 * Copyright (C) 1991, 1992 Linus Torvalds
3 */
4
5/*
6 * Hopefully this will be a rather complete VT102 implementation.
7 *
8 * Beeping thanks to John T Kohl.
9 *
10 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
11 * Chars, and VT100 enhancements by Peter MacDonald.
12 *
13 * Copy and paste function by Andrew Haylett,
14 * some enhancements by Alessandro Rubini.
15 *
16 * Code to check for different video-cards mostly by Galen Hunt,
17 * <g-hunt@ee.utah.edu>
18 *
19 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
20 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
21 *
22 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
23 * Resizing of consoles, aeb, 940926
24 *
25 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
26 * <poe@daimi.aau.dk>
27 *
28 * User-defined bell sound, new setterm control sequences and printk
29 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
30 *
31 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
32 *
33 * Merge with the abstract console driver by Geert Uytterhoeven
34 * <geert@linux-m68k.org>, Jan 1997.
35 *
36 * Original m68k console driver modifications by
37 *
38 * - Arno Griffioen <arno@usn.nl>
39 * - David Carter <carter@cs.bris.ac.uk>
40 *
41 * The abstract console driver provides a generic interface for a text
42 * console. It supports VGA text mode, frame buffer based graphical consoles
43 * and special graphics processors that are only accessible through some
44 * registers (e.g. a TMS340x0 GSP).
45 *
46 * The interface to the hardware is specified using a special structure
47 * (struct consw) which contains function pointers to console operations
48 * (see <linux/console.h> for more information).
49 *
50 * Support for changeable cursor shape
51 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
52 *
53 * Ported to i386 and con_scrolldelta fixed
54 * by Emmanuel Marty <core@ggi-project.org>, April 1998
55 *
56 * Resurrected character buffers in videoram plus lots of other trickery
57 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
58 *
59 * Removed old-style timers, introduced console_timer, made timer
e1f8e874 60 * deletion SMP-safe. 17Jun00, Andrew Morton
1da177e4
LT		 61 *
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
d4328b40
AT		 64 *
65 * Fixed UTF-8 mode so alternate charset modes always work according
66 * to control sequences interpreted in do_con_trol function
67 * preserving backward VT100 semigraphics compatibility,
68 * malformed UTF sequences represented as sequences of replacement glyphs,
69 * original codes or '?' as a last resort if replacement glyph is undefined
70 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
1da177e4
LT		 71 */
72
73#include <linux/module.h>
74#include <linux/types.h>
75#include <linux/sched.h>
76#include <linux/tty.h>
77#include <linux/tty_flip.h>
78#include <linux/kernel.h>
79#include <linux/string.h>
80#include <linux/errno.h>
81#include <linux/kd.h>
82#include <linux/slab.h>
83#include <linux/major.h>
84#include <linux/mm.h>
85#include <linux/console.h>
86#include <linux/init.h>
c831c338 87#include <linux/mutex.h>
1da177e4
LT		 88#include <linux/vt_kern.h>
89#include <linux/selection.h>
90#include <linux/tiocl.h>
91#include <linux/kbd_kern.h>
92#include <linux/consolemap.h>
93#include <linux/timer.h>
94#include <linux/interrupt.h>
1da177e4 95#include <linux/workqueue.h>
1da177e4
LT		 96#include <linux/pm.h>
97#include <linux/font.h>
98#include <linux/bitops.h>
b293d758 99#include <linux/notifier.h>
d81ed103
AC		 100#include <linux/device.h>
101#include <linux/io.h>
d81ed103 102#include <linux/uaccess.h>
81d44507 103#include <linux/kdb.h>
74c807ce 104#include <linux/ctype.h>
1da177e4 105
3e795de7 106#define MAX_NR_CON_DRIVER 16
1da177e4 107
6db4063c 108#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 109#define CON_DRIVER_FLAG_INIT 2
110#define CON_DRIVER_FLAG_ATTR 4
d364b5c3 111#define CON_DRIVER_FLAG_ZOMBIE 8
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)
bd63364c 139#define DEFAULT_CURSOR_BLINK_MS 200
1da177e4 140
1da177e4
LT		 141struct vc vc_cons [MAX_NR_CONSOLES];
142
143#ifndef VT_SINGLE_DRIVER
144static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145#endif
146
147static int con_open(struct tty_struct *, struct file *);
148static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151static void save_cur(struct vc_data *vc);
152static void reset_terminal(struct vc_data *vc, int do_clear);
153static void con_flush_chars(struct tty_struct *tty);
403aac96 154static int set_vesa_blanking(char __user *p);
1da177e4
LT		 155static void set_cursor(struct vc_data *vc);
156static void hide_cursor(struct vc_data *vc);
65f27f38 157static void console_callback(struct work_struct *ignored);
d364b5c3 158static void con_driver_unregister_callback(struct work_struct *ignored);
1da177e4
LT		 159static void blank_screen_t(unsigned long dummy);
160static void set_palette(struct vc_data *vc);
161
52c40fca
PH		 162#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
163
1da177e4 164static int printable; /* Is console ready for printing? */
77bf2bab 165int default_utf8 = true;
042f10ec 166module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 167int global_cursor_default = -1;
168module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 169
9ea9a886
CL		 170static int cur_default = CUR_DEFAULT;
171module_param(cur_default, int, S_IRUGO | S_IWUSR);
172
1da177e4
LT		 173/*
174 * ignore_poke: don't unblank the screen when things are typed. This is
175 * mainly for the privacy of braille terminal users.
176 */
177static int ignore_poke;
178
179int do_poke_blanked_console;
180int console_blanked;
181
182static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 183static int vesa_off_interval;
f324edc8
DM		 184static int blankinterval = 10*60;
185core_param(consoleblank, blankinterval, int, 0444);
1da177e4 186
65f27f38 187static DECLARE_WORK(console_work, console_callback);
d364b5c3 188static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
1da177e4
LT		 189
190/*
191 * fg_console is the current virtual console,
192 * last_console is the last used one,
193 * want_console is the console we want to switch to,
b45cfba4 194 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 195 */
196int fg_console;
197int last_console;
198int want_console = -1;
fed891c8
JW		 199static int saved_fg_console;
200static int saved_last_console;
201static int saved_want_console;
202static int saved_vc_mode;
beed5336 203static int saved_console_blanked;
1da177e4
LT		 204
205/*
206 * For each existing display, we have a pointer to console currently visible
207 * on that display, allowing consoles other than fg_console to be refreshed
208 * appropriately. Unless the low-level driver supplies its own display_fg
209 * variable, we use this one for the "master display".
210 */
211static struct vc_data *master_display_fg;
212
213/*
214 * Unfortunately, we need to delay tty echo when we're currently writing to the
215 * console since the code is (and always was) not re-entrant, so we schedule
216 * all flip requests to process context with schedule-task() and run it from
217 * console_callback().
218 */
219
220/*
221 * For the same reason, we defer scrollback to the console callback.
222 */
223static int scrollback_delta;
224
225/*
226 * Hook so that the power management routines can (un)blank
227 * the console on our behalf.
228 */
229int (*console_blank_hook)(int);
230
40565f19 231static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
1da177e4
LT		 232static int blank_state;
233static int blank_timer_expired;
234enum {
235 blank_off = 0,
236 blank_normal_wait,
237 blank_vesa_wait,
238};
239
fbc92a34
KS		 240/*
241 * /sys/class/tty/tty0/
242 *
243 * the attribute 'active' contains the name of the current vc
244 * console and it supports poll() to detect vc switches
245 */
246static struct device *tty0dev;
247
b293d758
ST		 248/*
249 * Notifier list for console events.
250 */
251static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
252
253int register_vt_notifier(struct notifier_block *nb)
254{
255 return atomic_notifier_chain_register(&vt_notifier_list, nb);
256}
257EXPORT_SYMBOL_GPL(register_vt_notifier);
258
259int unregister_vt_notifier(struct notifier_block *nb)
260{
261 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
262}
263EXPORT_SYMBOL_GPL(unregister_vt_notifier);
264
265static void notify_write(struct vc_data *vc, unsigned int unicode)
266{
502fcb79 267 struct vt_notifier_param param = { .vc = vc, .c = unicode };
b293d758
ST		 268 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
269}
270
271static void notify_update(struct vc_data *vc)
272{
273 struct vt_notifier_param param = { .vc = vc };
274 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
275}
1da177e4
LT		 276/*
277 * Low-Level Functions
278 */
279
280#define IS_FG(vc) ((vc)->vc_num == fg_console)
281
282#ifdef VT_BUF_VRAM_ONLY
283#define DO_UPDATE(vc) 0
284#else
f700d6e5 285#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
1da177e4
LT		 286#endif
287
288static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
289{
290 unsigned short *p;
291
292 if (!viewed)
293 p = (unsigned short *)(vc->vc_origin + offset);
294 else if (!vc->vc_sw->con_screen_pos)
295 p = (unsigned short *)(vc->vc_visible_origin + offset);
296 else
297 p = vc->vc_sw->con_screen_pos(vc, offset);
298 return p;
299}
300
e33ac1c1 301/* Called from the keyboard irq path.. */
1da177e4
LT		 302static inline void scrolldelta(int lines)
303{
e33ac1c1
AC		 304 /* FIXME */
305 /* scrolldelta needs some kind of consistency lock, but the BKL was
306 and still is not protecting versus the scheduled back end */
1da177e4
LT		 307 scrollback_delta += lines;
308 schedule_console_callback();
309}
310
311void schedule_console_callback(void)
312{
313 schedule_work(&console_work);
314}
315
316static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
317{
318 unsigned short *d, *s;
319
320 if (t+nr >= b)
321 nr = b - t - 1;
322 if (b > vc->vc_rows || t >= b || nr < 1)
323 return;
324 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
325 return;
326 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
327 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
328 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
386f40c8 329 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
1da177e4
LT		 330 vc->vc_size_row * nr);
331}
332
333static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
334{
335 unsigned short *s;
336 unsigned int step;
337
338 if (t+nr >= b)
339 nr = b - t - 1;
340 if (b > vc->vc_rows || t >= b || nr < 1)
341 return;
342 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
343 return;
344 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
345 step = vc->vc_cols * nr;
346 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
93f78da4 347 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
1da177e4
LT		 348}
349
350static void do_update_region(struct vc_data *vc, unsigned long start, int count)
351{
352#ifndef VT_BUF_VRAM_ONLY
353 unsigned int xx, yy, offset;
354 u16 *p;
355
356 p = (u16 *) start;
357 if (!vc->vc_sw->con_getxy) {
358 offset = (start - vc->vc_origin) / 2;
359 xx = offset % vc->vc_cols;
360 yy = offset / vc->vc_cols;
361 } else {
362 int nxx, nyy;
363 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
364 xx = nxx; yy = nyy;
365 }
366 for(;;) {
367 u16 attrib = scr_readw(p) & 0xff00;
368 int startx = xx;
369 u16 *q = p;
370 while (xx < vc->vc_cols && count) {
371 if (attrib != (scr_readw(p) & 0xff00)) {
372 if (p > q)
373 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
374 startx = xx;
375 q = p;
376 attrib = scr_readw(p) & 0xff00;
377 }
378 p++;
379 xx++;
380 count--;
381 }
382 if (p > q)
383 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
384 if (!count)
385 break;
386 xx = 0;
387 yy++;
388 if (vc->vc_sw->con_getxy) {
389 p = (u16 *)start;
390 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
391 }
392 }
393#endif
394}
395
396void update_region(struct vc_data *vc, unsigned long start, int count)
397{
398 WARN_CONSOLE_UNLOCKED();
399
400 if (DO_UPDATE(vc)) {
401 hide_cursor(vc);
402 do_update_region(vc, start, count);
403 set_cursor(vc);
404 }
405}
406
407/* Structure of attributes is hardware-dependent */
408
fa6ce9ab
JE		 409static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
410 u8 _underline, u8 _reverse, u8 _italic)
1da177e4
LT		 411{
412 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 413 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
414 _blink, _underline, _reverse, _italic);
1da177e4
LT		 415
416#ifndef VT_BUF_VRAM_ONLY
417/*
418 * ++roman: I completely changed the attribute format for monochrome
419 * mode (!can_do_color). The formerly used MDA (monochrome display
420 * adapter) format didn't allow the combination of certain effects.
421 * Now the attribute is just a bit vector:
422 * Bit 0..1: intensity (0..2)
423 * Bit 2 : underline
424 * Bit 3 : reverse
425 * Bit 7 : blink
426 */
427 {
c9e587ab 428 u8 a = _color;
1da177e4
LT		 429 if (!vc->vc_can_do_color)
430 return _intensity |
fa6ce9ab 431 (_italic ? 2 : 0) |
1da177e4
LT		 432 (_underline ? 4 : 0) |
433 (_reverse ? 8 : 0) |
434 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 435 if (_italic)
436 a = (a & 0xF0) | vc->vc_itcolor;
437 else if (_underline)
1da177e4
LT		 438 a = (a & 0xf0) | vc->vc_ulcolor;
439 else if (_intensity == 0)
440 a = (a & 0xf0) | vc->vc_ulcolor;
441 if (_reverse)
442 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
443 if (_blink)
444 a ^= 0x80;
445 if (_intensity == 2)
446 a ^= 0x08;
447 if (vc->vc_hi_font_mask == 0x100)
448 a <<= 1;
449 return a;
450 }
451#else
452 return 0;
453#endif
454}
455
456static void update_attr(struct vc_data *vc)
457{
fa6ce9ab
JE		 458 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
459 vc->vc_blink, vc->vc_underline,
460 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
461 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 462}
463
464/* Note: inverting the screen twice should revert to the original state */
465void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
466{
467 unsigned short *p;
468
469 WARN_CONSOLE_UNLOCKED();
470
471 count /= 2;
472 p = screenpos(vc, offset, viewed);
473 if (vc->vc_sw->con_invert_region)
474 vc->vc_sw->con_invert_region(vc, p, count);
475#ifndef VT_BUF_VRAM_ONLY
476 else {
477 u16 *q = p;
478 int cnt = count;
479 u16 a;
480
481 if (!vc->vc_can_do_color) {
482 while (cnt--) {
483 a = scr_readw(q);
484 a ^= 0x0800;
485 scr_writew(a, q);
486 q++;
487 }
488 } else if (vc->vc_hi_font_mask == 0x100) {
489 while (cnt--) {
490 a = scr_readw(q);
491 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
492 scr_writew(a, q);
493 q++;
494 }
495 } else {
496 while (cnt--) {
497 a = scr_readw(q);
498 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
499 scr_writew(a, q);
500 q++;
501 }
502 }
503 }
504#endif
505 if (DO_UPDATE(vc))
506 do_update_region(vc, (unsigned long) p, count);
19e3ae6b 507 notify_update(vc);
1da177e4
LT		 508}
509
510/* used by selection: complement pointer position */
511void complement_pos(struct vc_data *vc, int offset)
512{
414edcd3 513 static int old_offset = -1;
1da177e4
LT		 514 static unsigned short old;
515 static unsigned short oldx, oldy;
516
517 WARN_CONSOLE_UNLOCKED();
518
414edcd3
AD		 519 if (old_offset != -1 && old_offset >= 0 &&
520 old_offset < vc->vc_screenbuf_size) {
521 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 522 if (DO_UPDATE(vc))
523 vc->vc_sw->con_putc(vc, old, oldy, oldx);
19e3ae6b 524 notify_update(vc);
1da177e4 525 }
414edcd3
AD		 526
527 old_offset = offset;
528
529 if (offset != -1 && offset >= 0 &&
530 offset < vc->vc_screenbuf_size) {
1da177e4 531 unsigned short new;
414edcd3 532 unsigned short *p;
1da177e4
LT		 533 p = screenpos(vc, offset, 1);
534 old = scr_readw(p);
535 new = old ^ vc->vc_complement_mask;
536 scr_writew(new, p);
537 if (DO_UPDATE(vc)) {
538 oldx = (offset >> 1) % vc->vc_cols;
539 oldy = (offset >> 1) / vc->vc_cols;
540 vc->vc_sw->con_putc(vc, new, oldy, oldx);
541 }
19e3ae6b 542 notify_update(vc);
1da177e4
LT		 543 }
544}
545
546static void insert_char(struct vc_data *vc, unsigned int nr)
547{
81732c3b 548 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 549
a883b70d 550 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b 551 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
1da177e4 552 vc->vc_need_wrap = 0;
81732c3b
JFM		 553 if (DO_UPDATE(vc))
554 do_update_region(vc, (unsigned long) p,
b1a925f4 555 vc->vc_cols - vc->vc_x);
1da177e4
LT		 556}
557
558static void delete_char(struct vc_data *vc, unsigned int nr)
559{
81732c3b 560 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 561
b1a925f4 562 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b
JFM		 563 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
564 nr * 2);
1da177e4 565 vc->vc_need_wrap = 0;
81732c3b
JFM		 566 if (DO_UPDATE(vc))
567 do_update_region(vc, (unsigned long) p,
b1a925f4 568 vc->vc_cols - vc->vc_x);
1da177e4
LT		 569}
570
e882f715 571static int softcursor_original = -1;
1da177e4
LT		 572
573static void add_softcursor(struct vc_data *vc)
574{
575 int i = scr_readw((u16 *) vc->vc_pos);
576 u32 type = vc->vc_cursor_type;
577
578 if (! (type & 0x10)) return;
579 if (softcursor_original != -1) return;
580 softcursor_original = i;
581 i |= ((type >> 8) & 0xff00 );
582 i ^= ((type) & 0xff00 );
583 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
584 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
585 scr_writew(i, (u16 *) vc->vc_pos);
586 if (DO_UPDATE(vc))
587 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
588}
589
590static void hide_softcursor(struct vc_data *vc)
591{
592 if (softcursor_original != -1) {
593 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
594 if (DO_UPDATE(vc))
595 vc->vc_sw->con_putc(vc, softcursor_original,
596 vc->vc_y, vc->vc_x);
597 softcursor_original = -1;
598 }
599}
600
601static void hide_cursor(struct vc_data *vc)
602{
603 if (vc == sel_cons)
604 clear_selection();
605 vc->vc_sw->con_cursor(vc, CM_ERASE);
606 hide_softcursor(vc);
607}
608
609static void set_cursor(struct vc_data *vc)
610{
611 if (!IS_FG(vc) || console_blanked ||
612 vc->vc_mode == KD_GRAPHICS)
613 return;
614 if (vc->vc_deccm) {
615 if (vc == sel_cons)
616 clear_selection();
617 add_softcursor(vc);
618 if ((vc->vc_cursor_type & 0x0f) != 1)
619 vc->vc_sw->con_cursor(vc, CM_DRAW);
620 } else
621 hide_cursor(vc);
622}
623
624static void set_origin(struct vc_data *vc)
625{
626 WARN_CONSOLE_UNLOCKED();
627
628 if (!CON_IS_VISIBLE(vc) ||
629 !vc->vc_sw->con_set_origin ||
630 !vc->vc_sw->con_set_origin(vc))
631 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
632 vc->vc_visible_origin = vc->vc_origin;
633 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
634 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
635}
636
c0f160a7 637static void save_screen(struct vc_data *vc)
1da177e4
LT		 638{
639 WARN_CONSOLE_UNLOCKED();
640
641 if (vc->vc_sw->con_save_screen)
642 vc->vc_sw->con_save_screen(vc);
643}
644
645/*
646 * Redrawing of screen
647 */
648
2a248307 649void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 650{
651 unsigned short *p = (unsigned short *)vc->vc_origin;
652 int count = vc->vc_screenbuf_size / 2;
653 int mask = vc->vc_hi_font_mask | 0xff;
654
655 for (; count > 0; count--, p++) {
656 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
657 }
658}
659
660void redraw_screen(struct vc_data *vc, int is_switch)
661{
662 int redraw = 0;
663
664 WARN_CONSOLE_UNLOCKED();
665
666 if (!vc) {
667 /* strange ... */
668 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
669 return;
670 }
671
672 if (is_switch) {
673 struct vc_data *old_vc = vc_cons[fg_console].d;
674 if (old_vc == vc)
675 return;
676 if (!CON_IS_VISIBLE(vc))
677 redraw = 1;
678 *vc->vc_display_fg = vc;
679 fg_console = vc->vc_num;
680 hide_cursor(old_vc);
681 if (!CON_IS_VISIBLE(old_vc)) {
682 save_screen(old_vc);
683 set_origin(old_vc);
684 }
fbc92a34
KS		 685 if (tty0dev)
686 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 687 } else {
688 hide_cursor(vc);
689 redraw = 1;
690 }
691
692 if (redraw) {
693 int update;
694 int old_was_color = vc->vc_can_do_color;
695
696 set_origin(vc);
697 update = vc->vc_sw->con_switch(vc);
698 set_palette(vc);
699 /*
700 * If console changed from mono<->color, the best we can do
701 * is to clear the buffer attributes. As it currently stands,
702 * rebuilding new attributes from the old buffer is not doable
703 * without overly complex code.
704 */
705 if (old_was_color != vc->vc_can_do_color) {
706 update_attr(vc);
707 clear_buffer_attributes(vc);
708 }
8fd4bd22
JB		 709
710 /* Forcibly update if we're panicing */
711 if ((update && vc->vc_mode != KD_GRAPHICS) ||
712 vt_force_oops_output(vc))
1da177e4
LT		 713 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
714 }
715 set_cursor(vc);
716 if (is_switch) {
717 set_leds();
718 compute_shiftstate();
8182ec49 719 notify_update(vc);
1da177e4
LT		 720 }
721}
722
723/*
724 * Allocation, freeing and resizing of VTs.
725 */
726
727int vc_cons_allocated(unsigned int i)
728{
729 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
730}
731
732static void visual_init(struct vc_data *vc, int num, int init)
733{
734 /* ++Geert: vc->vc_sw->con_init determines console size */
735 if (vc->vc_sw)
736 module_put(vc->vc_sw->owner);
737 vc->vc_sw = conswitchp;
738#ifndef VT_SINGLE_DRIVER
739 if (con_driver_map[num])
740 vc->vc_sw = con_driver_map[num];
741#endif
742 __module_get(vc->vc_sw->owner);
743 vc->vc_num = num;
744 vc->vc_display_fg = &master_display_fg;
08b33249
DZ		 745 if (vc->vc_uni_pagedir_loc)
746 con_free_unimap(vc);
1da177e4 747 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
e4bdab70 748 vc->vc_uni_pagedir = NULL;
1da177e4
LT		 749 vc->vc_hi_font_mask = 0;
750 vc->vc_complement_mask = 0;
751 vc->vc_can_do_color = 0;
8fd4bd22 752 vc->vc_panic_force_write = false;
1b45996d 753 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 754 vc->vc_sw->con_init(vc, init);
755 if (!vc->vc_complement_mask)
756 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
757 vc->vc_s_complement_mask = vc->vc_complement_mask;
758 vc->vc_size_row = vc->vc_cols << 1;
759 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
760}
761
762int vc_allocate(unsigned int currcons) /* return 0 on success */
763{
34902b7f
JS		 764 struct vt_notifier_param param;
765 struct vc_data *vc;
766
1da177e4
LT		 767 WARN_CONSOLE_UNLOCKED();
768
769 if (currcons >= MAX_NR_CONSOLES)
770 return -ENXIO;
34902b7f
JS		 771
772 if (vc_cons[currcons].d)
773 return 0;
774
775 /* due to the granularity of kmalloc, we waste some memory here */
776 /* the alloc is done in two steps, to optimize the common situation
777 of a 25x80 console (structsize=216, screenbuf_size=4000) */
778 /* although the numbers above are not valid since long ago, the
779 point is still up-to-date and the comment still has its value
780 even if only as a historical artifact. --mj, July 1998 */
781 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
782 if (!vc)
1da177e4 783 return -ENOMEM;
34902b7f
JS		 784
785 vc_cons[currcons].d = vc;
786 tty_port_init(&vc->port);
787 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
788
789 visual_init(vc, currcons, 1);
790
791 if (!*vc->vc_uni_pagedir_loc)
1da177e4 792 con_set_default_unimap(vc);
f6c06b68 793
34902b7f
JS		 794 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
795 if (!vc->vc_screenbuf)
796 goto err_free;
797
798 /* If no drivers have overridden us and the user didn't pass a
799 boot option, default to displaying the cursor */
800 if (global_cursor_default == -1)
801 global_cursor_default = 1;
802
803 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
804 vcs_make_sysfs(currcons);
805 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
f6c06b68 806
1da177e4 807 return 0;
34902b7f
JS		 808err_free:
809 kfree(vc);
810 vc_cons[currcons].d = NULL;
811 return -ENOMEM;
1da177e4
LT		 812}
813
e400b6ec
AD		 814static inline int resize_screen(struct vc_data *vc, int width, int height,
815 int user)
1da177e4
LT		 816{
817 /* Resizes the resolution of the display adapater */
818 int err = 0;
819
820 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 821 err = vc->vc_sw->con_resize(vc, width, height, user);
822
1da177e4
LT		 823 return err;
824}
825
826/*
827 * Change # of rows and columns (0 means unchanged/the size of fg_console)
828 * [this is to be used together with some user program
829 * like resize that changes the hardware videomode]
830 */
831#define VC_RESIZE_MAXCOL (32767)
832#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 833
834/**
835 * vc_do_resize - resizing method for the tty
836 * @tty: tty being resized
837 * @real_tty: real tty (different to tty if a pty/tty pair)
838 * @vc: virtual console private data
839 * @cols: columns
840 * @lines: lines
841 *
842 * Resize a virtual console, clipping according to the actual constraints.
843 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 844 * information and perform any necessary signal handling.
8c9a9dd0 845 *
6a1c0680 846 * Caller must hold the console semaphore. Takes the termios rwsem and
8c9a9dd0
AC		 847 * ctrl_lock of the tty IFF a tty is passed.
848 */
849
fc6f6238
AC		 850static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
851 unsigned int cols, unsigned int lines)
1da177e4
LT		 852{
853 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 854 unsigned long end;
f2ee4ae8 855 unsigned int old_rows, old_row_size;
1da177e4 856 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 857 unsigned int user;
1da177e4
LT		 858 unsigned short *newscreen;
859
860 WARN_CONSOLE_UNLOCKED();
861
862 if (!vc)
863 return -ENXIO;
864
e400b6ec
AD		 865 user = vc->vc_resize_user;
866 vc->vc_resize_user = 0;
867
1da177e4
LT		 868 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
869 return -EINVAL;
870
871 new_cols = (cols ? cols : vc->vc_cols);
872 new_rows = (lines ? lines : vc->vc_rows);
873 new_row_size = new_cols << 1;
874 new_screen_size = new_row_size * new_rows;
875
876 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
877 return 0;
878
5cbded58 879 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 880 if (!newscreen)
881 return -ENOMEM;
882
883 old_rows = vc->vc_rows;
1da177e4 884 old_row_size = vc->vc_size_row;
1da177e4 885
e400b6ec 886 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 887 if (err) {
888 kfree(newscreen);
889 return err;
890 }
891
892 vc->vc_rows = new_rows;
893 vc->vc_cols = new_cols;
894 vc->vc_size_row = new_row_size;
895 vc->vc_screenbuf_size = new_screen_size;
896
897 rlth = min(old_row_size, new_row_size);
898 rrem = new_row_size - rlth;
899 old_origin = vc->vc_origin;
900 new_origin = (long) newscreen;
901 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 902
903 if (vc->vc_y > new_rows) {
904 if (old_rows - vc->vc_y < new_rows) {
905 /*
906 * Cursor near the bottom, copy contents from the
907 * bottom of buffer
908 */
909 old_origin += (old_rows - new_rows) * old_row_size;
3b41dc1a
AD		 910 } else {
911 /*
912 * Cursor is in no man's land, copy 1/2 screenful
913 * from the top and bottom of cursor position
914 */
915 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
3b41dc1a 916 }
9fc2b2d0
FJ		 917 }
918
919 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4
LT		 920
921 update_attr(vc);
922
3b41dc1a
AD		 923 while (old_origin < end) {
924 scr_memcpyw((unsigned short *) new_origin,
925 (unsigned short *) old_origin, rlth);
1da177e4 926 if (rrem)
3b41dc1a
AD		 927 scr_memsetw((void *)(new_origin + rlth),
928 vc->vc_video_erase_char, rrem);
1da177e4
LT		 929 old_origin += old_row_size;
930 new_origin += new_row_size;
931 }
932 if (new_scr_end > new_origin)
3b41dc1a
AD		 933 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
934 new_scr_end - new_origin);
5c9228f0 935 kfree(vc->vc_screenbuf);
1da177e4 936 vc->vc_screenbuf = newscreen;
1da177e4
LT		 937 vc->vc_screenbuf_size = new_screen_size;
938 set_origin(vc);
939
940 /* do part of a reset_terminal() */
941 vc->vc_top = 0;
942 vc->vc_bottom = vc->vc_rows;
943 gotoxy(vc, vc->vc_x, vc->vc_y);
944 save_cur(vc);
945
8c9a9dd0
AC		 946 if (tty) {
947 /* Rewrite the requested winsize data with the actual
948 resulting sizes */
949 struct winsize ws;
1da177e4
LT		 950 memset(&ws, 0, sizeof(ws));
951 ws.ws_row = vc->vc_rows;
952 ws.ws_col = vc->vc_cols;
953 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 954 tty_do_resize(tty, &ws);
1da177e4
LT		 955 }
956
957 if (CON_IS_VISIBLE(vc))
958 update_screen(vc);
8b92e87d 959 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 960 return err;
961}
962
8c9a9dd0
AC		 963/**
964 * vc_resize - resize a VT
965 * @vc: virtual console
966 * @cols: columns
967 * @rows: rows
968 *
969 * Resize a virtual console as seen from the console end of things. We
970 * use the common vc_do_resize methods to update the structures. The
971 * caller must hold the console sem to protect console internals and
8ce73264 972 * vc->port.tty
8c9a9dd0
AC		 973 */
974
975int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
976{
8ce73264 977 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 978}
979
980/**
981 * vt_resize - resize a VT
982 * @tty: tty to resize
8c9a9dd0
AC		 983 * @ws: winsize attributes
984 *
985 * Resize a virtual terminal. This is called by the tty layer as we
986 * register our own handler for resizing. The mutual helper does all
987 * the actual work.
988 *
989 * Takes the console sem and the called methods then take the tty
6a1c0680 990 * termios_rwsem and the tty ctrl_lock in that order.
8c9a9dd0 991 */
da2bdf9a 992static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 993{
8c9a9dd0
AC		 994 struct vc_data *vc = tty->driver_data;
995 int ret;
ca9bda00 996
ac751efa 997 console_lock();
fc6f6238 998 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 999 console_unlock();
8c9a9dd0 1000 return ret;
ca9bda00 1001}
1da177e4 1002
421b40a6 1003struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 1004{
421b40a6
PH		 1005 struct vc_data *vc = NULL;
1006
1da177e4
LT		 1007 WARN_CONSOLE_UNLOCKED();
1008
1009 if (vc_cons_allocated(currcons)) {
421b40a6 1010 struct vt_notifier_param param;
4995f8ef 1011
421b40a6 1012 param.vc = vc = vc_cons[currcons].d;
b293d758 1013 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1014 vcs_remove_sysfs(currcons);
1da177e4 1015 vc->vc_sw->con_deinit(vc);
bde0d2c9 1016 put_pid(vc->vt_pid);
d459ec0b 1017 module_put(vc->vc_sw->owner);
5c9228f0 1018 kfree(vc->vc_screenbuf);
1da177e4
LT		 1019 vc_cons[currcons].d = NULL;
1020 }
421b40a6 1021 return vc;
1da177e4
LT		 1022}
1023
1024/*
1025 * VT102 emulator
1026 */
1027
079c9534
AC		 1028#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1029#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1030#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1031
1032#define decarm VC_REPEAT
1033#define decckm VC_CKMODE
1034#define kbdapplic VC_APPLIC
1035#define lnm VC_CRLF
1036
1037/*
1038 * this is what the terminal answers to a ESC-Z or csi0c query.
1039 */
1040#define VT100ID "\033[?1;2c"
1041#define VT102ID "\033[?6c"
1042
8ede5cce 1043const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1da177e4
LT		 1044 8,12,10,14, 9,13,11,15 };
1045
1046/* the default colour table, for VGA+ colour systems */
91e74ca5
JS		 1047unsigned char default_red[] = {
1048 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1049 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1050};
1051module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1052
1053unsigned char default_grn[] = {
1054 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1055 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1056};
1057module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1058
1059unsigned char default_blu[] = {
1060 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1061 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1062};
1063module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1c2bbe6a 1064
1da177e4
LT		 1065/*
1066 * gotoxy() must verify all boundaries, because the arguments
1067 * might also be negative. If the given position is out of
1068 * bounds, the cursor is placed at the nearest margin.
1069 */
1070static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1071{
1072 int min_y, max_y;
1073
1074 if (new_x < 0)
1075 vc->vc_x = 0;
1076 else {
1077 if (new_x >= vc->vc_cols)
1078 vc->vc_x = vc->vc_cols - 1;
1079 else
1080 vc->vc_x = new_x;
1081 }
1082
1083 if (vc->vc_decom) {
1084 min_y = vc->vc_top;
1085 max_y = vc->vc_bottom;
1086 } else {
1087 min_y = 0;
1088 max_y = vc->vc_rows;
1089 }
1090 if (new_y < min_y)
1091 vc->vc_y = min_y;
1092 else if (new_y >= max_y)
1093 vc->vc_y = max_y - 1;
1094 else
1095 vc->vc_y = new_y;
1096 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1097 vc->vc_need_wrap = 0;
1098}
1099
1100/* for absolute user moves, when decom is set */
1101static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1102{
1103 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1104}
1105
1106void scrollback(struct vc_data *vc, int lines)
1107{
1108 if (!lines)
1109 lines = vc->vc_rows / 2;
1110 scrolldelta(-lines);
1111}
1112
1113void scrollfront(struct vc_data *vc, int lines)
1114{
1115 if (!lines)
1116 lines = vc->vc_rows / 2;
1117 scrolldelta(lines);
1118}
1119
1120static void lf(struct vc_data *vc)
1121{
1122 /* don't scroll if above bottom of scrolling region, or
1123 * if below scrolling region
1124 */
1125 if (vc->vc_y + 1 == vc->vc_bottom)
1126 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1127 else if (vc->vc_y < vc->vc_rows - 1) {
1128 vc->vc_y++;
1129 vc->vc_pos += vc->vc_size_row;
1130 }
1131 vc->vc_need_wrap = 0;
b293d758 1132 notify_write(vc, '\n');
1da177e4
LT		 1133}
1134
1135static void ri(struct vc_data *vc)
1136{
1137 /* don't scroll if below top of scrolling region, or
1138 * if above scrolling region
1139 */
1140 if (vc->vc_y == vc->vc_top)
1141 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1142 else if (vc->vc_y > 0) {
1143 vc->vc_y--;
1144 vc->vc_pos -= vc->vc_size_row;
1145 }
1146 vc->vc_need_wrap = 0;
1147}
1148
1149static inline void cr(struct vc_data *vc)
1150{
1151 vc->vc_pos -= vc->vc_x << 1;
1152 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1153 notify_write(vc, '\r');
1da177e4
LT		 1154}
1155
1156static inline void bs(struct vc_data *vc)
1157{
1158 if (vc->vc_x) {
1159 vc->vc_pos -= 2;
1160 vc->vc_x--;
1161 vc->vc_need_wrap = 0;
b293d758 1162 notify_write(vc, '\b');
1da177e4
LT		 1163 }
1164}
1165
1166static inline void del(struct vc_data *vc)
1167{
1168 /* ignored */
1169}
1170
1171static void csi_J(struct vc_data *vc, int vpar)
1172{
1173 unsigned int count;
1174 unsigned short * start;
1175
1176 switch (vpar) {
1177 case 0: /* erase from cursor to end of display */
1178 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1179 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1180 break;
1181 case 1: /* erase from start to cursor */
1182 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1183 start = (unsigned short *)vc->vc_origin;
1da177e4 1184 break;
f8df13e0
PP		 1185 case 3: /* erase scroll-back buffer (and whole display) */
1186 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1187 vc->vc_screenbuf_size >> 1);
1188 set_origin(vc);
0930b095
PP		 1189 if (CON_IS_VISIBLE(vc))
1190 update_screen(vc);
f8df13e0 1191 /* fall through */
1da177e4
LT		 1192 case 2: /* erase whole display */
1193 count = vc->vc_cols * vc->vc_rows;
1194 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1195 break;
1196 default:
1197 return;
1198 }
1199 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
81732c3b
JFM		 1200 if (DO_UPDATE(vc))
1201 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1202 vc->vc_need_wrap = 0;
1203}
1204
1205static void csi_K(struct vc_data *vc, int vpar)
1206{
1207 unsigned int count;
1208 unsigned short * start;
1209
1210 switch (vpar) {
1211 case 0: /* erase from cursor to end of line */
1212 count = vc->vc_cols - vc->vc_x;
1213 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1214 break;
1215 case 1: /* erase from start of line to cursor */
1216 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1217 count = vc->vc_x + 1;
1da177e4
LT		 1218 break;
1219 case 2: /* erase whole line */
1220 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1221 count = vc->vc_cols;
1da177e4
LT		 1222 break;
1223 default:
1224 return;
1225 }
1226 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1227 vc->vc_need_wrap = 0;
81732c3b
JFM		 1228 if (DO_UPDATE(vc))
1229 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1230}
1231
1232static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1233{ /* not vt100? */
1234 int count;
1235
1236 if (!vpar)
1237 vpar++;
1238 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1239
1240 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1241 if (DO_UPDATE(vc))
1242 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1243 vc->vc_need_wrap = 0;
1244}
1245
1246static void default_attr(struct vc_data *vc)
1247{
1248 vc->vc_intensity = 1;
fa6ce9ab 1249 vc->vc_italic = 0;
1da177e4
LT		 1250 vc->vc_underline = 0;
1251 vc->vc_reverse = 0;
1252 vc->vc_blink = 0;
1253 vc->vc_color = vc->vc_def_color;
1254}
1255
cec5b2a9
AB		 1256struct rgb { u8 r; u8 g; u8 b; };
1257
678afb9a 1258static struct rgb rgb_from_256(int i)
cec5b2a9
AB		 1259{
1260 struct rgb c;
1261 if (i < 8) { /* Standard colours. */
1262 c.r = i&1 ? 0xaa : 0x00;
1263 c.g = i&2 ? 0xaa : 0x00;
1264 c.b = i&4 ? 0xaa : 0x00;
1265 } else if (i < 16) {
1266 c.r = i&1 ? 0xff : 0x55;
1267 c.g = i&2 ? 0xff : 0x55;
1268 c.b = i&4 ? 0xff : 0x55;
1269 } else if (i < 232) { /* 6x6x6 colour cube. */
1270 c.r = (i - 16) / 36 * 85 / 2;
1271 c.g = (i - 16) / 6 % 6 * 85 / 2;
1272 c.b = (i - 16) % 6 * 85 / 2;
1273 } else /* Grayscale ramp. */
1274 c.r = c.g = c.b = i * 10 - 2312;
1275 return c;
1276}
1277
1278static void rgb_foreground(struct vc_data *vc, struct rgb c)
1279{
1280 u8 hue, max = c.r;
1281 if (c.g > max)
1282 max = c.g;
1283 if (c.b > max)
1284 max = c.b;
1285 hue = (c.r > max/2 ? 4 : 0)
1286 | (c.g > max/2 ? 2 : 0)
1287 | (c.b > max/2 ? 1 : 0);
1288 if (hue == 7 && max <= 0x55)
1289 hue = 0, vc->vc_intensity = 2;
1290 else
1291 vc->vc_intensity = (max > 0xaa) + 1;
1292 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1293}
1294
1295static void rgb_background(struct vc_data *vc, struct rgb c)
1296{
1297 /* For backgrounds, err on the dark side. */
1298 vc->vc_color = (vc->vc_color & 0x0f)
1299 | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1300}
1301
ac751efa 1302/* console_lock is held */
1da177e4
LT		 1303static void csi_m(struct vc_data *vc)
1304{
1305 int i;
1306
1307 for (i = 0; i <= vc->vc_npar; i++)
1308 switch (vc->vc_par[i]) {
1309 case 0: /* all attributes off */
1310 default_attr(vc);
1311 break;
1312 case 1:
1313 vc->vc_intensity = 2;
1314 break;
1315 case 2:
1316 vc->vc_intensity = 0;
1317 break;
fa6ce9ab
JE		 1318 case 3:
1319 vc->vc_italic = 1;
1320 break;
1da177e4
LT		 1321 case 4:
1322 vc->vc_underline = 1;
1323 break;
1324 case 5:
1325 vc->vc_blink = 1;
1326 break;
1327 case 7:
1328 vc->vc_reverse = 1;
1329 break;
1330 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1331 * Select primary font, don't display
1332 * control chars if defined, don't set
1333 * bit 8 on output.
1334 */
1335 vc->vc_translate = set_translate(vc->vc_charset == 0
1336 ? vc->vc_G0_charset
1337 : vc->vc_G1_charset, vc);
1338 vc->vc_disp_ctrl = 0;
1339 vc->vc_toggle_meta = 0;
1340 break;
1341 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1342 * Select first alternate font, lets
1343 * chars < 32 be displayed as ROM chars.
1344 */
1345 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1346 vc->vc_disp_ctrl = 1;
1347 vc->vc_toggle_meta = 0;
1348 break;
1349 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1350 * Select second alternate font, toggle
1351 * high bit before displaying as ROM char.
1352 */
1353 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1354 vc->vc_disp_ctrl = 1;
1355 vc->vc_toggle_meta = 1;
1356 break;
1357 case 21:
1358 case 22:
1359 vc->vc_intensity = 1;
1360 break;
fa6ce9ab
JE		 1361 case 23:
1362 vc->vc_italic = 0;
1363 break;
1da177e4
LT		 1364 case 24:
1365 vc->vc_underline = 0;
1366 break;
1367 case 25:
1368 vc->vc_blink = 0;
1369 break;
1370 case 27:
1371 vc->vc_reverse = 0;
1372 break;
cec5b2a9 1373 case 38: /* ITU T.416
3415097f
AB		 1374 * Higher colour modes.
1375 * They break the usual properties of SGR codes
1376 * and thus need to be detected and ignored by
1377 * hand. Strictly speaking, that standard also
1378 * wants : rather than ; as separators, contrary
1379 * to ECMA-48, but no one produces such codes
1380 * and almost no one accepts them.
1381 */
1382 i++;
1383 if (i > vc->vc_npar)
1384 break;
cec5b2a9
AB		 1385 if (vc->vc_par[i] == 5 && /* 256 colours */
1386 i < vc->vc_npar) { /* ubiquitous */
1387 i++;
1388 rgb_foreground(vc,
1389 rgb_from_256(vc->vc_par[i]));
1390 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1391 i <= vc->vc_npar + 3) {/* extremely rare */
085f4d84
PF		 1392 struct rgb c = {
1393 .r = vc->vc_par[i + 1],
1394 .g = vc->vc_par[i + 2],
1395 .b = vc->vc_par[i + 3],
1396 };
cec5b2a9
AB		 1397 rgb_foreground(vc, c);
1398 i += 3;
1399 }
3415097f 1400 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
cec5b2a9 1401 * there's no point in supporting them.
3415097f
AB		 1402 */
1403 break;
cec5b2a9
AB		 1404 case 48:
1405 i++;
1406 if (i > vc->vc_npar)
1407 break;
1408 if (vc->vc_par[i] == 5 && /* 256 colours */
1409 i < vc->vc_npar) {
1410 i++;
1411 rgb_background(vc,
1412 rgb_from_256(vc->vc_par[i]));
1413 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1414 i <= vc->vc_npar + 3) {
085f4d84
PF		 1415 struct rgb c = {
1416 .r = vc->vc_par[i + 1],
1417 .g = vc->vc_par[i + 2],
1418 .b = vc->vc_par[i + 3],
1419 };
cec5b2a9
AB		 1420 rgb_background(vc, c);
1421 i += 3;
1422 }
1423 break;
64545880 1424 case 39:
1da177e4 1425 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1da177e4
LT		 1426 break;
1427 case 49:
1428 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1429 break;
1430 default:
1431 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1432 vc->vc_color = color_table[vc->vc_par[i] - 30]
1433 | (vc->vc_color & 0xf0);
1434 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1435 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1436 | (vc->vc_color & 0x0f);
1437 break;
1438 }
1439 update_attr(vc);
1440}
1441
6732c8bb 1442static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1443{
1444 while (*p) {
6732c8bb 1445 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1446 p++;
1447 }
6732c8bb 1448 tty_schedule_flip(port);
1da177e4
LT		 1449}
1450
1451static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1452{
1453 char buf[40];
1454
1455 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1456 respond_string(buf, tty->port);
1da177e4
LT		 1457}
1458
1459static inline void status_report(struct tty_struct *tty)
1460{
6732c8bb 1461 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1462}
1463
6732c8bb 1464static inline void respond_ID(struct tty_struct *tty)
1da177e4 1465{
6732c8bb 1466 respond_string(VT102ID, tty->port);
1da177e4
LT		 1467}
1468
1469void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1470{
1471 char buf[8];
1472
1473 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1474 (char)('!' + mry));
6732c8bb 1475 respond_string(buf, tty->port);
1da177e4
LT		 1476}
1477
1478/* invoked via ioctl(TIOCLINUX) and through set_selection */
1479int mouse_reporting(void)
1480{
1481 return vc_cons[fg_console].d->vc_report_mouse;
1482}
1483
ac751efa 1484/* console_lock is held */
1da177e4
LT		 1485static void set_mode(struct vc_data *vc, int on_off)
1486{
1487 int i;
1488
1489 for (i = 0; i <= vc->vc_npar; i++)
1490 if (vc->vc_ques) {
1491 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1492 case 1: /* Cursor keys send ^[Ox/^[[x */
1493 if (on_off)
1494 set_kbd(vc, decckm);
1495 else
1496 clr_kbd(vc, decckm);
1497 break;
1498 case 3: /* 80/132 mode switch unimplemented */
1499 vc->vc_deccolm = on_off;
1500#if 0
1501 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1502 /* this alone does not suffice; some user mode
1503 utility has to change the hardware regs */
1504#endif
1505 break;
1506 case 5: /* Inverted screen on/off */
1507 if (vc->vc_decscnm != on_off) {
1508 vc->vc_decscnm = on_off;
1509 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1510 update_attr(vc);
1511 }
1512 break;
1513 case 6: /* Origin relative/absolute */
1514 vc->vc_decom = on_off;
1515 gotoxay(vc, 0, 0);
1516 break;
1517 case 7: /* Autowrap on/off */
1518 vc->vc_decawm = on_off;
1519 break;
1520 case 8: /* Autorepeat on/off */
1521 if (on_off)
1522 set_kbd(vc, decarm);
1523 else
1524 clr_kbd(vc, decarm);
1525 break;
1526 case 9:
1527 vc->vc_report_mouse = on_off ? 1 : 0;
1528 break;
1529 case 25: /* Cursor on/off */
1530 vc->vc_deccm = on_off;
1531 break;
1532 case 1000:
1533 vc->vc_report_mouse = on_off ? 2 : 0;
1534 break;
1535 }
1536 } else {
1537 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1538 case 3: /* Monitor (display ctrls) */
1539 vc->vc_disp_ctrl = on_off;
1540 break;
1541 case 4: /* Insert Mode on/off */
1542 vc->vc_decim = on_off;
1543 break;
1544 case 20: /* Lf, Enter == CrLf/Lf */
1545 if (on_off)
1546 set_kbd(vc, lnm);
1547 else
1548 clr_kbd(vc, lnm);
1549 break;
1550 }
1551 }
1552}
1553
ac751efa 1554/* console_lock is held */
1da177e4
LT		 1555static void setterm_command(struct vc_data *vc)
1556{
1557 switch(vc->vc_par[0]) {
1558 case 1: /* set color for underline mode */
1559 if (vc->vc_can_do_color &&
1560 vc->vc_par[1] < 16) {
1561 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1562 if (vc->vc_underline)
1563 update_attr(vc);
1564 }
1565 break;
1566 case 2: /* set color for half intensity mode */
1567 if (vc->vc_can_do_color &&
1568 vc->vc_par[1] < 16) {
1569 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1570 if (vc->vc_intensity == 0)
1571 update_attr(vc);
1572 }
1573 break;
1574 case 8: /* store colors as defaults */
1575 vc->vc_def_color = vc->vc_attr;
1576 if (vc->vc_hi_font_mask == 0x100)
1577 vc->vc_def_color >>= 1;
1578 default_attr(vc);
1579 update_attr(vc);
1580 break;
1581 case 9: /* set blanking interval */
f324edc8 1582 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1583 poke_blanked_console();
1584 break;
1585 case 10: /* set bell frequency in Hz */
1586 if (vc->vc_npar >= 1)
1587 vc->vc_bell_pitch = vc->vc_par[1];
1588 else
1589 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1590 break;
1591 case 11: /* set bell duration in msec */
1592 if (vc->vc_npar >= 1)
1593 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
3372ec28 1594 msecs_to_jiffies(vc->vc_par[1]) : 0;
1da177e4
LT		 1595 else
1596 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1597 break;
1598 case 12: /* bring specified console to the front */
1599 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1600 set_console(vc->vc_par[1] - 1);
1601 break;
1602 case 13: /* unblank the screen */
1603 poke_blanked_console();
1604 break;
1605 case 14: /* set vesa powerdown interval */
1606 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1607 break;
1608 case 15: /* activate the previous console */
1609 set_console(last_console);
1610 break;
bd63364c
SD		 1611 case 16: /* set cursor blink duration in msec */
1612 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1613 vc->vc_par[1] <= USHRT_MAX)
1614 vc->vc_cur_blink_ms = vc->vc_par[1];
1615 else
1616 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1617 break;
1da177e4
LT		 1618 }
1619}
1620
ac751efa 1621/* console_lock is held */
1da177e4
LT		 1622static void csi_at(struct vc_data *vc, unsigned int nr)
1623{
1624 if (nr > vc->vc_cols - vc->vc_x)
1625 nr = vc->vc_cols - vc->vc_x;
1626 else if (!nr)
1627 nr = 1;
1628 insert_char(vc, nr);
1629}
1630
ac751efa 1631/* console_lock is held */
1da177e4
LT		 1632static void csi_L(struct vc_data *vc, unsigned int nr)
1633{
1634 if (nr > vc->vc_rows - vc->vc_y)
1635 nr = vc->vc_rows - vc->vc_y;
1636 else if (!nr)
1637 nr = 1;
1638 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1639 vc->vc_need_wrap = 0;
1640}
1641
ac751efa 1642/* console_lock is held */
1da177e4
LT		 1643static void csi_P(struct vc_data *vc, unsigned int nr)
1644{
1645 if (nr > vc->vc_cols - vc->vc_x)
1646 nr = vc->vc_cols - vc->vc_x;
1647 else if (!nr)
1648 nr = 1;
1649 delete_char(vc, nr);
1650}
1651
ac751efa 1652/* console_lock is held */
1da177e4
LT		 1653static void csi_M(struct vc_data *vc, unsigned int nr)
1654{
1655 if (nr > vc->vc_rows - vc->vc_y)
1656 nr = vc->vc_rows - vc->vc_y;
1657 else if (!nr)
1658 nr=1;
1659 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1660 vc->vc_need_wrap = 0;
1661}
1662
ac751efa 1663/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1664static void save_cur(struct vc_data *vc)
1665{
1666 vc->vc_saved_x = vc->vc_x;
1667 vc->vc_saved_y = vc->vc_y;
1668 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1669 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1670 vc->vc_s_underline = vc->vc_underline;
1671 vc->vc_s_blink = vc->vc_blink;
1672 vc->vc_s_reverse = vc->vc_reverse;
1673 vc->vc_s_charset = vc->vc_charset;
1674 vc->vc_s_color = vc->vc_color;
1675 vc->vc_saved_G0 = vc->vc_G0_charset;
1676 vc->vc_saved_G1 = vc->vc_G1_charset;
1677}
1678
ac751efa 1679/* console_lock is held */
1da177e4
LT		 1680static void restore_cur(struct vc_data *vc)
1681{
1682 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1683 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1684 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1685 vc->vc_underline = vc->vc_s_underline;
1686 vc->vc_blink = vc->vc_s_blink;
1687 vc->vc_reverse = vc->vc_s_reverse;
1688 vc->vc_charset = vc->vc_s_charset;
1689 vc->vc_color = vc->vc_s_color;
1690 vc->vc_G0_charset = vc->vc_saved_G0;
1691 vc->vc_G1_charset = vc->vc_saved_G1;
1692 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1693 update_attr(vc);
1694 vc->vc_need_wrap = 0;
1695}
1696
b290af68 1697enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1da177e4 1698 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
63f3a16d 1699 ESpalette, ESosc };
1da177e4 1700
ac751efa 1701/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1702static void reset_terminal(struct vc_data *vc, int do_clear)
1703{
1704 vc->vc_top = 0;
1705 vc->vc_bottom = vc->vc_rows;
1706 vc->vc_state = ESnormal;
1707 vc->vc_ques = 0;
1708 vc->vc_translate = set_translate(LAT1_MAP, vc);
1709 vc->vc_G0_charset = LAT1_MAP;
1710 vc->vc_G1_charset = GRAF_MAP;
1711 vc->vc_charset = 0;
1712 vc->vc_need_wrap = 0;
1713 vc->vc_report_mouse = 0;
042f10ec 1714 vc->vc_utf = default_utf8;
1da177e4
LT		 1715 vc->vc_utf_count = 0;
1716
1717 vc->vc_disp_ctrl = 0;
1718 vc->vc_toggle_meta = 0;
1719
1720 vc->vc_decscnm = 0;
1721 vc->vc_decom = 0;
1722 vc->vc_decawm = 1;
f6c06b68 1723 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1724 vc->vc_decim = 0;
1725
079c9534 1726 vt_reset_keyboard(vc->vc_num);
1da177e4 1727
9ea9a886 1728 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1729 vc->vc_complement_mask = vc->vc_s_complement_mask;
1730
1731 default_attr(vc);
1732 update_attr(vc);
1733
1734 vc->vc_tab_stop[0] = 0x01010100;
1735 vc->vc_tab_stop[1] =
1736 vc->vc_tab_stop[2] =
1737 vc->vc_tab_stop[3] =
a564738c
WK		 1738 vc->vc_tab_stop[4] =
1739 vc->vc_tab_stop[5] =
1740 vc->vc_tab_stop[6] =
1741 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1742
1743 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1744 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 1745 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1746
1747 gotoxy(vc, 0, 0);
1748 save_cur(vc);
1749 if (do_clear)
1750 csi_J(vc, 2);
1751}
1752
ac751efa 1753/* console_lock is held */
1da177e4
LT		 1754static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1755{
1756 /*
1757 * Control characters can be used in the _middle_
1758 * of an escape sequence.
1759 */
63f3a16d
AB		 1760 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1761 return;
1da177e4
LT		 1762 switch (c) {
1763 case 0:
1764 return;
1765 case 7:
63f3a16d
AB		 1766 if (vc->vc_state == ESosc)
1767 vc->vc_state = ESnormal;
1768 else if (vc->vc_bell_duration)
1da177e4
LT		 1769 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1770 return;
1771 case 8:
1772 bs(vc);
1773 return;
1774 case 9:
1775 vc->vc_pos -= (vc->vc_x << 1);
1776 while (vc->vc_x < vc->vc_cols - 1) {
1777 vc->vc_x++;
1778 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1779 break;
1780 }
1781 vc->vc_pos += (vc->vc_x << 1);
b293d758 1782 notify_write(vc, '\t');
1da177e4
LT		 1783 return;
1784 case 10: case 11: case 12:
1785 lf(vc);
1786 if (!is_kbd(vc, lnm))
1787 return;
1788 case 13:
1789 cr(vc);
1790 return;
1791 case 14:
1792 vc->vc_charset = 1;
1793 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1794 vc->vc_disp_ctrl = 1;
1795 return;
1796 case 15:
1797 vc->vc_charset = 0;
1798 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1799 vc->vc_disp_ctrl = 0;
1800 return;
1801 case 24: case 26:
1802 vc->vc_state = ESnormal;
1803 return;
1804 case 27:
1805 vc->vc_state = ESesc;
1806 return;
1807 case 127:
1808 del(vc);
1809 return;
1810 case 128+27:
1811 vc->vc_state = ESsquare;
1812 return;
1813 }
1814 switch(vc->vc_state) {
1815 case ESesc:
1816 vc->vc_state = ESnormal;
1817 switch (c) {
1818 case '[':
1819 vc->vc_state = ESsquare;
1820 return;
1821 case ']':
1822 vc->vc_state = ESnonstd;
1823 return;
1824 case '%':
1825 vc->vc_state = ESpercent;
1826 return;
1827 case 'E':
1828 cr(vc);
1829 lf(vc);
1830 return;
1831 case 'M':
1832 ri(vc);
1833 return;
1834 case 'D':
1835 lf(vc);
1836 return;
1837 case 'H':
1838 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1839 return;
1840 case 'Z':
1841 respond_ID(tty);
1842 return;
1843 case '7':
1844 save_cur(vc);
1845 return;
1846 case '8':
1847 restore_cur(vc);
1848 return;
1849 case '(':
1850 vc->vc_state = ESsetG0;
1851 return;
1852 case ')':
1853 vc->vc_state = ESsetG1;
1854 return;
1855 case '#':
1856 vc->vc_state = EShash;
1857 return;
1858 case 'c':
1859 reset_terminal(vc, 1);
1860 return;
1861 case '>': /* Numeric keypad */
1862 clr_kbd(vc, kbdapplic);
1863 return;
1864 case '=': /* Appl. keypad */
1865 set_kbd(vc, kbdapplic);
1866 return;
1867 }
1868 return;
1869 case ESnonstd:
1870 if (c=='P') { /* palette escape sequence */
1871 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1872 vc->vc_par[vc->vc_npar] = 0;
1873 vc->vc_npar = 0;
1874 vc->vc_state = ESpalette;
1875 return;
1876 } else if (c=='R') { /* reset palette */
1877 reset_palette(vc);
1878 vc->vc_state = ESnormal;
63f3a16d
AB		 1879 } else if (c>='0' && c<='9')
1880 vc->vc_state = ESosc;
1881 else
1da177e4
LT		 1882 vc->vc_state = ESnormal;
1883 return;
1884 case ESpalette:
74c807ce
AS		 1885 if (isxdigit(c)) {
1886 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1887 if (vc->vc_npar == 7) {
1888 int i = vc->vc_par[0] * 3, j = 1;
1889 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1890 vc->vc_palette[i++] += vc->vc_par[j++];
1891 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1892 vc->vc_palette[i++] += vc->vc_par[j++];
1893 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1894 vc->vc_palette[i] += vc->vc_par[j];
1895 set_palette(vc);
1896 vc->vc_state = ESnormal;
1897 }
1898 } else
1899 vc->vc_state = ESnormal;
1900 return;
1901 case ESsquare:
1902 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1903 vc->vc_par[vc->vc_npar] = 0;
1904 vc->vc_npar = 0;
1905 vc->vc_state = ESgetpars;
1906 if (c == '[') { /* Function key */
1907 vc->vc_state=ESfunckey;
1908 return;
1909 }
1910 vc->vc_ques = (c == '?');
1911 if (vc->vc_ques)
1912 return;
1913 case ESgetpars:
1914 if (c == ';' && vc->vc_npar < NPAR - 1) {
1915 vc->vc_npar++;
1916 return;
1917 } else if (c>='0' && c<='9') {
1918 vc->vc_par[vc->vc_npar] *= 10;
1919 vc->vc_par[vc->vc_npar] += c - '0';
1920 return;
b290af68 1921 }
1da177e4
LT		 1922 vc->vc_state = ESnormal;
1923 switch(c) {
1924 case 'h':
1925 set_mode(vc, 1);
1926 return;
1927 case 'l':
1928 set_mode(vc, 0);
1929 return;
1930 case 'c':
1931 if (vc->vc_ques) {
1932 if (vc->vc_par[0])
1933 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1934 else
9ea9a886 1935 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1936 return;
1937 }
1938 break;
1939 case 'm':
1940 if (vc->vc_ques) {
1941 clear_selection();
1942 if (vc->vc_par[0])
1943 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1944 else
1945 vc->vc_complement_mask = vc->vc_s_complement_mask;
1946 return;
1947 }
1948 break;
1949 case 'n':
1950 if (!vc->vc_ques) {
1951 if (vc->vc_par[0] == 5)
1952 status_report(tty);
1953 else if (vc->vc_par[0] == 6)
1954 cursor_report(vc, tty);
1955 }
1956 return;
1957 }
1958 if (vc->vc_ques) {
1959 vc->vc_ques = 0;
1960 return;
1961 }
1962 switch(c) {
1963 case 'G': case '`':
1964 if (vc->vc_par[0])
1965 vc->vc_par[0]--;
1966 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1967 return;
1968 case 'A':
1969 if (!vc->vc_par[0])
1970 vc->vc_par[0]++;
1971 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1972 return;
1973 case 'B': case 'e':
1974 if (!vc->vc_par[0])
1975 vc->vc_par[0]++;
1976 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1977 return;
1978 case 'C': case 'a':
1979 if (!vc->vc_par[0])
1980 vc->vc_par[0]++;
1981 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1982 return;
1983 case 'D':
1984 if (!vc->vc_par[0])
1985 vc->vc_par[0]++;
1986 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1987 return;
1988 case 'E':
1989 if (!vc->vc_par[0])
1990 vc->vc_par[0]++;
1991 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1992 return;
1993 case 'F':
1994 if (!vc->vc_par[0])
1995 vc->vc_par[0]++;
1996 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1997 return;
1998 case 'd':
1999 if (vc->vc_par[0])
2000 vc->vc_par[0]--;
2001 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2002 return;
2003 case 'H': case 'f':
2004 if (vc->vc_par[0])
2005 vc->vc_par[0]--;
2006 if (vc->vc_par[1])
2007 vc->vc_par[1]--;
2008 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2009 return;
2010 case 'J':
2011 csi_J(vc, vc->vc_par[0]);
2012 return;
2013 case 'K':
2014 csi_K(vc, vc->vc_par[0]);
2015 return;
2016 case 'L':
2017 csi_L(vc, vc->vc_par[0]);
2018 return;
2019 case 'M':
2020 csi_M(vc, vc->vc_par[0]);
2021 return;
2022 case 'P':
2023 csi_P(vc, vc->vc_par[0]);
2024 return;
2025 case 'c':
2026 if (!vc->vc_par[0])
2027 respond_ID(tty);
2028 return;
2029 case 'g':
2030 if (!vc->vc_par[0])
2031 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2032 else if (vc->vc_par[0] == 3) {
2033 vc->vc_tab_stop[0] =
2034 vc->vc_tab_stop[1] =
2035 vc->vc_tab_stop[2] =
2036 vc->vc_tab_stop[3] =
a564738c
WK		 2037 vc->vc_tab_stop[4] =
2038 vc->vc_tab_stop[5] =
2039 vc->vc_tab_stop[6] =
2040 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 2041 }
2042 return;
2043 case 'm':
2044 csi_m(vc);
2045 return;
2046 case 'q': /* DECLL - but only 3 leds */
2047 /* map 0,1,2,3 to 0,1,2,4 */
2048 if (vc->vc_par[0] < 4)
079c9534 2049 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2050 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2051 return;
2052 case 'r':
2053 if (!vc->vc_par[0])
2054 vc->vc_par[0]++;
2055 if (!vc->vc_par[1])
2056 vc->vc_par[1] = vc->vc_rows;
2057 /* Minimum allowed region is 2 lines */
2058 if (vc->vc_par[0] < vc->vc_par[1] &&
2059 vc->vc_par[1] <= vc->vc_rows) {
2060 vc->vc_top = vc->vc_par[0] - 1;
2061 vc->vc_bottom = vc->vc_par[1];
2062 gotoxay(vc, 0, 0);
2063 }
2064 return;
2065 case 's':
2066 save_cur(vc);
2067 return;
2068 case 'u':
2069 restore_cur(vc);
2070 return;
2071 case 'X':
2072 csi_X(vc, vc->vc_par[0]);
2073 return;
2074 case '@':
2075 csi_at(vc, vc->vc_par[0]);
2076 return;
2077 case ']': /* setterm functions */
2078 setterm_command(vc);
2079 return;
2080 }
2081 return;
2082 case ESpercent:
2083 vc->vc_state = ESnormal;
2084 switch (c) {
2085 case '@': /* defined in ISO 2022 */
2086 vc->vc_utf = 0;
2087 return;
2088 case 'G': /* prelim official escape code */
2089 case '8': /* retained for compatibility */
2090 vc->vc_utf = 1;
2091 return;
2092 }
2093 return;
2094 case ESfunckey:
2095 vc->vc_state = ESnormal;
2096 return;
2097 case EShash:
2098 vc->vc_state = ESnormal;
2099 if (c == '8') {
2100 /* DEC screen alignment test. kludge :-) */
2101 vc->vc_video_erase_char =
2102 (vc->vc_video_erase_char & 0xff00) | 'E';
2103 csi_J(vc, 2);
2104 vc->vc_video_erase_char =
2105 (vc->vc_video_erase_char & 0xff00) | ' ';
2106 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2107 }
2108 return;
2109 case ESsetG0:
2110 if (c == '0')
2111 vc->vc_G0_charset = GRAF_MAP;
2112 else if (c == 'B')
2113 vc->vc_G0_charset = LAT1_MAP;
2114 else if (c == 'U')
2115 vc->vc_G0_charset = IBMPC_MAP;
2116 else if (c == 'K')
2117 vc->vc_G0_charset = USER_MAP;
2118 if (vc->vc_charset == 0)
2119 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2120 vc->vc_state = ESnormal;
2121 return;
2122 case ESsetG1:
2123 if (c == '0')
2124 vc->vc_G1_charset = GRAF_MAP;
2125 else if (c == 'B')
2126 vc->vc_G1_charset = LAT1_MAP;
2127 else if (c == 'U')
2128 vc->vc_G1_charset = IBMPC_MAP;
2129 else if (c == 'K')
2130 vc->vc_G1_charset = USER_MAP;
2131 if (vc->vc_charset == 1)
2132 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2133 vc->vc_state = ESnormal;
2134 return;
63f3a16d
AB		 2135 case ESosc:
2136 return;
1da177e4
LT		 2137 default:
2138 vc->vc_state = ESnormal;
2139 }
2140}
2141
2f1a2ccb 2142/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2143 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2144 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2145 */
2146struct interval {
2147 uint32_t first;
2148 uint32_t last;
2149};
2150
2151static int bisearch(uint32_t ucs, const struct interval *table, int max)
2152{
2153 int min = 0;
2154 int mid;
2155
2156 if (ucs < table[0].first || ucs > table[max].last)
2157 return 0;
2158 while (max >= min) {
2159 mid = (min + max) / 2;
2160 if (ucs > table[mid].last)
2161 min = mid + 1;
2162 else if (ucs < table[mid].first)
2163 max = mid - 1;
2164 else
2165 return 1;
2166 }
2167 return 0;
2168}
2169
2170static int is_double_width(uint32_t ucs)
2171{
2172 static const struct interval double_width[] = {
2173 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2174 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2175 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2176 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2177 };
0f11541b 2178 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2179}
2180
ac751efa 2181/* acquires console_lock */
1da177e4
LT		 2182static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2183{
2184#ifdef VT_BUF_VRAM_ONLY
2185#define FLUSH do { } while(0);
2186#else
2187#define FLUSH if (draw_x >= 0) { \
2188 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2189 draw_x = -1; \
2190 }
2191#endif
2192
2193 int c, tc, ok, n = 0, draw_x = -1;
2194 unsigned int currcons;
2195 unsigned long draw_from = 0, draw_to = 0;
2196 struct vc_data *vc;
2f1a2ccb 2197 unsigned char vc_attr;
0341a4d0 2198 struct vt_notifier_param param;
2f1a2ccb
EK		 2199 uint8_t rescan;
2200 uint8_t inverse;
2201 uint8_t width;
1da177e4 2202 u16 himask, charmask;
1da177e4
LT		 2203
2204 if (in_interrupt())
2205 return count;
2206
2207 might_sleep();
2208
ac751efa 2209 console_lock();
1da177e4
LT		 2210 vc = tty->driver_data;
2211 if (vc == NULL) {
2212 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2213 console_unlock();
1da177e4
LT		 2214 return 0;
2215 }
2216
2217 currcons = vc->vc_num;
2218 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2219 /* could this happen? */
2220 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2221 console_unlock();
2222 return 0;
1da177e4 2223 }
1da177e4 2224
1da177e4
LT		 2225 himask = vc->vc_hi_font_mask;
2226 charmask = himask ? 0x1ff : 0xff;
2227
2228 /* undraw cursor first */
2229 if (IS_FG(vc))
2230 hide_cursor(vc);
2231
0341a4d0
KD		 2232 param.vc = vc;
2233
1da177e4
LT		 2234 while (!tty->stopped && count) {
2235 int orig = *buf;
2236 c = orig;
2237 buf++;
2238 n++;
2239 count--;
2f1a2ccb
EK		 2240 rescan = 0;
2241 inverse = 0;
2242 width = 1;
1da177e4
LT		 2243
2244 /* Do no translation at all in control states */
2245 if (vc->vc_state != ESnormal) {
2246 tc = c;
d4328b40 2247 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2248 /* Combine UTF-8 into Unicode in vc_utf_char.
2249 * vc_utf_count is the number of continuation bytes still
2250 * expected to arrive.
2251 * vc_npar is the number of continuation bytes arrived so
2252 * far
2253 */
d4328b40 2254rescan_last_byte:
2f1a2ccb
EK		 2255 if ((c & 0xc0) == 0x80) {
2256 /* Continuation byte received */
2257 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2258 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2259 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2260 vc->vc_npar++;
2261 if (--vc->vc_utf_count) {
2262 /* Still need some bytes */
1da177e4 2263 continue;
2f1a2ccb
EK		 2264 }
2265 /* Got a whole character */
2266 c = vc->vc_utf_char;
2267 /* Reject overlong sequences */
2268 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2269 c > utf8_length_changes[vc->vc_npar])
2270 c = 0xfffd;
2271 } else {
2272 /* Unexpected continuation byte */
2273 vc->vc_utf_count = 0;
2274 c = 0xfffd;
2275 }
1da177e4 2276 } else {
2f1a2ccb
EK		 2277 /* Single ASCII byte or first byte of a sequence received */
2278 if (vc->vc_utf_count) {
2279 /* Continuation byte expected */
2280 rescan = 1;
2281 vc->vc_utf_count = 0;
2282 c = 0xfffd;
2283 } else if (c > 0x7f) {
2284 /* First byte of a multibyte sequence received */
2285 vc->vc_npar = 0;
2286 if ((c & 0xe0) == 0xc0) {
2287 vc->vc_utf_count = 1;
2288 vc->vc_utf_char = (c & 0x1f);
2289 } else if ((c & 0xf0) == 0xe0) {
2290 vc->vc_utf_count = 2;
2291 vc->vc_utf_char = (c & 0x0f);
2292 } else if ((c & 0xf8) == 0xf0) {
2293 vc->vc_utf_count = 3;
2294 vc->vc_utf_char = (c & 0x07);
2295 } else if ((c & 0xfc) == 0xf8) {
2296 vc->vc_utf_count = 4;
2297 vc->vc_utf_char = (c & 0x03);
2298 } else if ((c & 0xfe) == 0xfc) {
2299 vc->vc_utf_count = 5;
2300 vc->vc_utf_char = (c & 0x01);
2301 } else {
2302 /* 254 and 255 are invalid */
2303 c = 0xfffd;
2304 }
2305 if (vc->vc_utf_count) {
2306 /* Still need some bytes */
2307 continue;
2308 }
2309 }
2310 /* Nothing to do if an ASCII byte was received */
1da177e4 2311 }
2f1a2ccb
EK		 2312 /* End of UTF-8 decoding. */
2313 /* c is the received character, or U+FFFD for invalid sequences. */
2314 /* Replace invalid Unicode code points with U+FFFD too */
2315 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2316 c = 0xfffd;
2317 tc = c;
d4328b40 2318 } else { /* no utf or alternate charset mode */
a29ccf6f 2319 tc = vc_translate(vc, c);
1da177e4
LT		 2320 }
2321
0341a4d0
KD		 2322 param.c = tc;
2323 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2324 &param) == NOTIFY_STOP)
2325 continue;
2326
1da177e4
LT		 2327 /* If the original code was a control character we
2328 * only allow a glyph to be displayed if the code is
2329 * not normally used (such as for cursor movement) or
2330 * if the disp_ctrl mode has been explicitly enabled.
2331 * Certain characters (as given by the CTRL_ALWAYS
2332 * bitmap) are always displayed as control characters,
2333 * as the console would be pretty useless without
2334 * them; to display an arbitrary font position use the
2335 * direct-to-font zone in UTF-8 mode.
2336 */
2337 ok = tc && (c >= 32 ||
d4328b40
AT		 2338 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2339 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2340 && (c != 127 || vc->vc_disp_ctrl)
2341 && (c != 128+27);
2342
2343 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2344 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2345 if (is_double_width(c))
2346 width = 2;
2347 }
1da177e4
LT		 2348 /* Now try to find out how to display it */
2349 tc = conv_uni_to_pc(vc, tc);
d4328b40 2350 if (tc & ~charmask) {
2f1a2ccb
EK		 2351 if (tc == -1 || tc == -2) {
2352 continue; /* nothing to display */
2353 }
2354 /* Glyph not found */
c0b79882 2355 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2356 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2357 This would make absolutely no sense with Unicode in mind,
2358 but do this for ASCII characters since a font may lack
2359 Unicode mapping info and we don't want to end up with
2360 having question marks only. */
2f1a2ccb
EK		 2361 tc = c;
2362 } else {
2363 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2364 tc = conv_uni_to_pc(vc, 0xfffd);
2365 if (tc < 0) {
2366 inverse = 1;
2367 tc = conv_uni_to_pc(vc, '?');
2368 if (tc < 0) tc = '?';
2369 }
2370 }
d4328b40 2371 }
1da177e4 2372
2f1a2ccb
EK		 2373 if (!inverse) {
2374 vc_attr = vc->vc_attr;
1da177e4 2375 } else {
2f1a2ccb
EK		 2376 /* invert vc_attr */
2377 if (!vc->vc_can_do_color) {
2378 vc_attr = (vc->vc_attr) ^ 0x08;
2379 } else if (vc->vc_hi_font_mask == 0x100) {
2380 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2381 } else {
2382 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2383 }
1ed8a2b3 2384 FLUSH
1da177e4 2385 }
2f1a2ccb
EK		 2386
2387 while (1) {
2388 if (vc->vc_need_wrap || vc->vc_decim)
2389 FLUSH
2390 if (vc->vc_need_wrap) {
2391 cr(vc);
2392 lf(vc);
2393 }
2394 if (vc->vc_decim)
2395 insert_char(vc, 1);
2396 scr_writew(himask ?
2397 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2398 (vc_attr << 8) + tc,
2399 (u16 *) vc->vc_pos);
2400 if (DO_UPDATE(vc) && draw_x < 0) {
2401 draw_x = vc->vc_x;
2402 draw_from = vc->vc_pos;
2403 }
2404 if (vc->vc_x == vc->vc_cols - 1) {
2405 vc->vc_need_wrap = vc->vc_decawm;
2406 draw_to = vc->vc_pos + 2;
2407 } else {
2408 vc->vc_x++;
2409 draw_to = (vc->vc_pos += 2);
d4328b40 2410 }
2f1a2ccb
EK		 2411
2412 if (!--width) break;
2413
2414 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2415 if (tc < 0) tc = ' ';
2416 }
b293d758 2417 notify_write(vc, c);
2f1a2ccb 2418
1ed8a2b3
EK		 2419 if (inverse) {
2420 FLUSH
2421 }
2422
2f1a2ccb
EK		 2423 if (rescan) {
2424 rescan = 0;
2425 inverse = 0;
2426 width = 1;
d4328b40
AT		 2427 c = orig;
2428 goto rescan_last_byte;
2429 }
1da177e4
LT		 2430 continue;
2431 }
2432 FLUSH
2433 do_con_trol(tty, vc, orig);
2434 }
2435 FLUSH
2436 console_conditional_schedule();
ac751efa 2437 console_unlock();
b293d758 2438 notify_update(vc);
1da177e4
LT		 2439 return n;
2440#undef FLUSH
2441}
2442
2443/*
2444 * This is the console switching callback.
2445 *
2446 * Doing console switching in a process context allows
2447 * us to do the switches asynchronously (needed when we want
2448 * to switch due to a keyboard interrupt). Synchronization
2449 * with other console code and prevention of re-entrancy is
ac751efa 2450 * ensured with console_lock.
1da177e4 2451 */
65f27f38 2452static void console_callback(struct work_struct *ignored)
1da177e4 2453{
ac751efa 2454 console_lock();
1da177e4
LT		 2455
2456 if (want_console >= 0) {
2457 if (want_console != fg_console &&
2458 vc_cons_allocated(want_console)) {
2459 hide_cursor(vc_cons[fg_console].d);
2460 change_console(vc_cons[want_console].d);
2461 /* we only changed when the console had already
2462 been allocated - a new console is not created
2463 in an interrupt routine */
2464 }
2465 want_console = -1;
2466 }
2467 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2468 do_poke_blanked_console = 0;
2469 poke_blanked_console();
2470 }
2471 if (scrollback_delta) {
2472 struct vc_data *vc = vc_cons[fg_console].d;
2473 clear_selection();
2474 if (vc->vc_mode == KD_TEXT)
2475 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2476 scrollback_delta = 0;
2477 }
2478 if (blank_timer_expired) {
2479 do_blank_screen(0);
2480 blank_timer_expired = 0;
2481 }
b293d758 2482 notify_update(vc_cons[fg_console].d);
1da177e4 2483
ac751efa 2484 console_unlock();
1da177e4
LT		 2485}
2486
b257bc05 2487int set_console(int nr)
1da177e4 2488{
b257bc05
AJ		 2489 struct vc_data *vc = vc_cons[fg_console].d;
2490
2491 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2492 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2493
2494 /*
2495 * Console switch will fail in console_callback() or
2496 * change_console() so there is no point scheduling
2497 * the callback
2498 *
2499 * Existing set_console() users don't check the return
2500 * value so this shouldn't break anything
2501 */
2502 return -EINVAL;
2503 }
2504
1da177e4
LT		 2505 want_console = nr;
2506 schedule_console_callback();
b257bc05
AJ		 2507
2508 return 0;
1da177e4
LT		 2509}
2510
2511struct tty_driver *console_driver;
2512
2513#ifdef CONFIG_VT_CONSOLE
2514
5ada918b
BW		 2515/**
2516 * vt_kmsg_redirect() - Sets/gets the kernel message console
2517 * @new: The new virtual terminal number or -1 if the console should stay
2518 * unchanged
2519 *
2520 * By default, the kernel messages are always printed on the current virtual
2521 * console. However, the user may modify that default with the
2522 * TIOCL_SETKMSGREDIRECT ioctl call.
2523 *
2524 * This function sets the kernel message console to be @new. It returns the old
2525 * virtual console number. The virtual terminal number 0 (both as parameter and
2526 * return value) means no redirection (i.e. always printed on the currently
2527 * active console).
2528 *
2529 * The parameter -1 means that only the current console is returned, but the
2530 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2531 * case to make the code more understandable.
2532 *
2533 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2534 * the parameter and always returns 0.
2535 */
2536int vt_kmsg_redirect(int new)
2537{
2538 static int kmsg_con;
2539
2540 if (new != -1)
2541 return xchg(&kmsg_con, new);
2542 else
2543 return kmsg_con;
2544}
2545
1da177e4
LT		 2546/*
2547 * Console on virtual terminal
2548 *
2549 * The console must be locked when we get here.
2550 */
2551
2552static void vt_console_print(struct console *co, const char *b, unsigned count)
2553{
2554 struct vc_data *vc = vc_cons[fg_console].d;
2555 unsigned char c;
b0940003 2556 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2557 const ushort *start;
2558 ushort cnt = 0;
2559 ushort myx;
5ada918b 2560 int kmsg_console;
1da177e4
LT		 2561
2562 /* console busy or not yet initialized */
b0940003
NP		 2563 if (!printable)
2564 return;
2565 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2566 return;
2567
5ada918b
BW		 2568 kmsg_console = vt_get_kmsg_redirect();
2569 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2570 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2571
2572 /* read `x' only after setting currcons properly (otherwise
2573 the `x' macro will read the x of the foreground console). */
2574 myx = vc->vc_x;
2575
2576 if (!vc_cons_allocated(fg_console)) {
2577 /* impossible */
2578 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2579 goto quit;
2580 }
2581
8fd4bd22 2582 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2583 goto quit;
2584
2585 /* undraw cursor first */
2586 if (IS_FG(vc))
2587 hide_cursor(vc);
2588
2589 start = (ushort *)vc->vc_pos;
2590
2591 /* Contrived structure to try to emulate original need_wrap behaviour
2592 * Problems caused when we have need_wrap set on '\n' character */
2593 while (count--) {
2594 c = *b++;
2595 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2596 if (cnt > 0) {
2597 if (CON_IS_VISIBLE(vc))
2598 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2599 vc->vc_x += cnt;
2600 if (vc->vc_need_wrap)
2601 vc->vc_x--;
2602 cnt = 0;
2603 }
2604 if (c == 8) { /* backspace */
2605 bs(vc);
2606 start = (ushort *)vc->vc_pos;
2607 myx = vc->vc_x;
2608 continue;
2609 }
2610 if (c != 13)
2611 lf(vc);
2612 cr(vc);
2613 start = (ushort *)vc->vc_pos;
2614 myx = vc->vc_x;
2615 if (c == 10 || c == 13)
2616 continue;
2617 }
2618 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2619 notify_write(vc, c);
1da177e4
LT		 2620 cnt++;
2621 if (myx == vc->vc_cols - 1) {
2622 vc->vc_need_wrap = 1;
2623 continue;
2624 }
2625 vc->vc_pos += 2;
2626 myx++;
2627 }
2628 if (cnt > 0) {
2629 if (CON_IS_VISIBLE(vc))
2630 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2631 vc->vc_x += cnt;
2632 if (vc->vc_x == vc->vc_cols) {
2633 vc->vc_x--;
2634 vc->vc_need_wrap = 1;
2635 }
2636 }
2637 set_cursor(vc);
b293d758 2638 notify_update(vc);
1da177e4
LT		 2639
2640quit:
b0940003 2641 spin_unlock(&printing_lock);
1da177e4
LT		 2642}
2643
2644static struct tty_driver *vt_console_device(struct console *c, int *index)
2645{
2646 *index = c->index ? c->index-1 : fg_console;
2647 return console_driver;
2648}
2649
2650static struct console vt_console_driver = {
2651 .name = "tty",
2652 .write = vt_console_print,
2653 .device = vt_console_device,
2654 .unblank = unblank_screen,
2655 .flags = CON_PRINTBUFFER,
2656 .index = -1,
2657};
2658#endif
2659
2660/*
2661 * Handling of Linux-specific VC ioctls
2662 */
2663
2664/*
ac751efa 2665 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2666 *
2667 * There are some functions which don't need it.
2668 *
2669 * There are some functions which can sleep for arbitrary periods
2670 * (paste_selection) but we don't need the lock there anyway.
2671 *
2672 * set_selection has locking, and definitely needs it
2673 */
2674
2675int tioclinux(struct tty_struct *tty, unsigned long arg)
2676{
2677 char type, data;
2678 char __user *p = (char __user *)arg;
2679 int lines;
2680 int ret;
2681
1da177e4
LT		 2682 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2683 return -EPERM;
2684 if (get_user(type, p))
2685 return -EFAULT;
2686 ret = 0;
04f378b1 2687
1da177e4
LT		 2688 switch (type)
2689 {
2690 case TIOCL_SETSEL:
ac751efa 2691 console_lock();
1da177e4 2692 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2693 console_unlock();
1da177e4
LT		 2694 break;
2695 case TIOCL_PASTESEL:
2696 ret = paste_selection(tty);
2697 break;
2698 case TIOCL_UNBLANKSCREEN:
ac751efa 2699 console_lock();
1da177e4 2700 unblank_screen();
ac751efa 2701 console_unlock();
1da177e4
LT		 2702 break;
2703 case TIOCL_SELLOADLUT:
5289475d 2704 console_lock();
1da177e4 2705 ret = sel_loadlut(p);
5289475d 2706 console_unlock();
1da177e4
LT		 2707 break;
2708 case TIOCL_GETSHIFTSTATE:
04f378b1 2709
1da177e4
LT		 2710 /*
2711 * Make it possible to react to Shift+Mousebutton.
2712 * Note that 'shift_state' is an undocumented
2713 * kernel-internal variable; programs not closely
2714 * related to the kernel should not use this.
2715 */
079c9534 2716 data = vt_get_shift_state();
1da177e4
LT		 2717 ret = __put_user(data, p);
2718 break;
2719 case TIOCL_GETMOUSEREPORTING:
20f62579 2720 console_lock(); /* May be overkill */
1da177e4 2721 data = mouse_reporting();
20f62579 2722 console_unlock();
1da177e4
LT		 2723 ret = __put_user(data, p);
2724 break;
2725 case TIOCL_SETVESABLANK:
20f62579 2726 console_lock();
403aac96 2727 ret = set_vesa_blanking(p);
20f62579 2728 console_unlock();
1da177e4 2729 break;
0ca07731 2730 case TIOCL_GETKMSGREDIRECT:
5ada918b 2731 data = vt_get_kmsg_redirect();
0ca07731
RW		 2732 ret = __put_user(data, p);
2733 break;
1da177e4
LT		 2734 case TIOCL_SETKMSGREDIRECT:
2735 if (!capable(CAP_SYS_ADMIN)) {
2736 ret = -EPERM;
2737 } else {
2738 if (get_user(data, p+1))
2739 ret = -EFAULT;
2740 else
5ada918b 2741 vt_kmsg_redirect(data);
1da177e4
LT		 2742 }
2743 break;
2744 case TIOCL_GETFGCONSOLE:
20f62579
AC		 2745 /* No locking needed as this is a transiently
2746 correct return anyway if the caller hasn't
2747 disabled switching */
1da177e4
LT		 2748 ret = fg_console;
2749 break;
2750 case TIOCL_SCROLLCONSOLE:
2751 if (get_user(lines, (s32 __user *)(p+4))) {
2752 ret = -EFAULT;
2753 } else {
20f62579
AC		 2754 /* Need the console lock here. Note that lots
2755 of other calls need fixing before the lock
2756 is actually useful ! */
2757 console_lock();
1da177e4 2758 scrollfront(vc_cons[fg_console].d, lines);
20f62579 2759 console_unlock();
1da177e4
LT		 2760 ret = 0;
2761 }
2762 break;
2763 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2764 console_lock();
1da177e4
LT		 2765 ignore_poke = 1;
2766 do_blank_screen(0);
ac751efa 2767 console_unlock();
1da177e4
LT		 2768 break;
2769 case TIOCL_BLANKEDSCREEN:
2770 ret = console_blanked;
2771 break;
2772 default:
2773 ret = -EINVAL;
2774 break;
2775 }
2776 return ret;
2777}
2778
2779/*
2780 * /dev/ttyN handling
2781 */
2782
2783static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2784{
2785 int retval;
2786
2787 retval = do_con_write(tty, buf, count);
2788 con_flush_chars(tty);
2789
2790 return retval;
2791}
2792
5d19f546 2793static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2794{
2795 if (in_interrupt())
5d19f546
AC		 2796 return 0; /* n_r3964 calls put_char() from interrupt context */
2797 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2798}
2799
2800static int con_write_room(struct tty_struct *tty)
2801{
2802 if (tty->stopped)
2803 return 0;
a88a69c9 2804 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2805}
2806
2807static int con_chars_in_buffer(struct tty_struct *tty)
2808{
2809 return 0; /* we're not buffering */
2810}
2811
2812/*
2813 * con_throttle and con_unthrottle are only used for
2814 * paste_selection(), which has to stuff in a large number of
2815 * characters...
2816 */
2817static void con_throttle(struct tty_struct *tty)
2818{
2819}
2820
2821static void con_unthrottle(struct tty_struct *tty)
2822{
2823 struct vc_data *vc = tty->driver_data;
2824
2825 wake_up_interruptible(&vc->paste_wait);
2826}
2827
2828/*
2829 * Turn the Scroll-Lock LED on when the tty is stopped
2830 */
2831static void con_stop(struct tty_struct *tty)
2832{
2833 int console_num;
2834 if (!tty)
2835 return;
2836 console_num = tty->index;
2837 if (!vc_cons_allocated(console_num))
2838 return;
079c9534 2839 vt_kbd_con_stop(console_num);
1da177e4
LT		 2840}
2841
2842/*
2843 * Turn the Scroll-Lock LED off when the console is started
2844 */
2845static void con_start(struct tty_struct *tty)
2846{
2847 int console_num;
2848 if (!tty)
2849 return;
2850 console_num = tty->index;
2851 if (!vc_cons_allocated(console_num))
2852 return;
079c9534 2853 vt_kbd_con_start(console_num);
1da177e4
LT		 2854}
2855
2856static void con_flush_chars(struct tty_struct *tty)
2857{
2858 struct vc_data *vc;
2859
2860 if (in_interrupt()) /* from flush_to_ldisc */
2861 return;
2862
2863 /* if we race with con_close(), vt may be null */
ac751efa 2864 console_lock();
1da177e4
LT		 2865 vc = tty->driver_data;
2866 if (vc)
2867 set_cursor(vc);
ac751efa 2868 console_unlock();
1da177e4
LT		 2869}
2870
2871/*
2872 * Allocate the console screen memory.
2873 */
bc1e99d9 2874static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 2875{
2876 unsigned int currcons = tty->index;
bc1e99d9
JS		 2877 struct vc_data *vc;
2878 int ret;
1da177e4 2879
ac751efa 2880 console_lock();
bc1e99d9
JS		 2881 ret = vc_allocate(currcons);
2882 if (ret)
2883 goto unlock;
feebed65 2884
bc1e99d9 2885 vc = vc_cons[currcons].d;
1da177e4 2886
bc1e99d9
JS		 2887 /* Still being freed */
2888 if (vc->port.tty) {
2889 ret = -ERESTARTSYS;
2890 goto unlock;
2891 }
2892
2893 ret = tty_port_install(&vc->port, driver, tty);
2894 if (ret)
2895 goto unlock;
2896
2897 tty->driver_data = vc;
2898 vc->port.tty = tty;
2899
2900 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2901 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2902 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 2903 }
bc1e99d9 2904 if (vc->vc_utf)
adc8d746 2905 tty->termios.c_iflag |= IUTF8;
bc1e99d9 2906 else
adc8d746 2907 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 2908unlock:
ac751efa 2909 console_unlock();
1da177e4
LT		 2910 return ret;
2911}
2912
bc1e99d9
JS		 2913static int con_open(struct tty_struct *tty, struct file *filp)
2914{
2915 /* everything done in install */
2916 return 0;
2917}
2918
2919
1da177e4
LT		 2920static void con_close(struct tty_struct *tty, struct file *filp)
2921{
feebed65
AC		 2922 /* Nothing to do - we defer to shutdown */
2923}
1da177e4 2924
feebed65
AC		 2925static void con_shutdown(struct tty_struct *tty)
2926{
2927 struct vc_data *vc = tty->driver_data;
2928 BUG_ON(vc == NULL);
ac751efa 2929 console_lock();
8ce73264 2930 vc->port.tty = NULL;
ac751efa 2931 console_unlock();
1da177e4
LT		 2932}
2933
3855ae1c 2934static int default_color = 7; /* white */
fa6ce9ab
JE		 2935static int default_italic_color = 2; // green (ASCII)
2936static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 2937module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 2938module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2939module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2940
1da177e4
LT		 2941static void vc_init(struct vc_data *vc, unsigned int rows,
2942 unsigned int cols, int do_clear)
2943{
2944 int j, k ;
2945
2946 vc->vc_cols = cols;
2947 vc->vc_rows = rows;
2948 vc->vc_size_row = cols << 1;
2949 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2950
2951 set_origin(vc);
2952 vc->vc_pos = vc->vc_origin;
2953 reset_vc(vc);
2954 for (j=k=0; j<16; j++) {
2955 vc->vc_palette[k++] = default_red[j] ;
2956 vc->vc_palette[k++] = default_grn[j] ;
2957 vc->vc_palette[k++] = default_blu[j] ;
2958 }
3855ae1c 2959 vc->vc_def_color = default_color;
fa6ce9ab
JE		 2960 vc->vc_ulcolor = default_underline_color;
2961 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2962 vc->vc_halfcolor = 0x08; /* grey */
2963 init_waitqueue_head(&vc->paste_wait);
2964 reset_terminal(vc, do_clear);
2965}
2966
2967/*
2968 * This routine initializes console interrupts, and does nothing
2969 * else. If you want the screen to clear, call tty_write with
2970 * the appropriate escape-sequence.
2971 */
2972
2973static int __init con_init(void)
2974{
2975 const char *display_desc = NULL;
2976 struct vc_data *vc;
3e795de7 2977 unsigned int currcons = 0, i;
1da177e4 2978
ac751efa 2979 console_lock();
1da177e4
LT		 2980
2981 if (conswitchp)
2982 display_desc = conswitchp->con_startup();
2983 if (!display_desc) {
2984 fg_console = 0;
ac751efa 2985 console_unlock();
1da177e4
LT		 2986 return 0;
2987 }
2988
3e795de7
AD		 2989 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2990 struct con_driver *con_driver = &registered_con_driver[i];
2991
2992 if (con_driver->con == NULL) {
2993 con_driver->con = conswitchp;
2994 con_driver->desc = display_desc;
2995 con_driver->flag = CON_DRIVER_FLAG_INIT;
2996 con_driver->first = 0;
2997 con_driver->last = MAX_NR_CONSOLES - 1;
2998 break;
2999 }
3000 }
3001
3002 for (i = 0; i < MAX_NR_CONSOLES; i++)
3003 con_driver_map[i] = conswitchp;
3004
1da177e4
LT		 3005 if (blankinterval) {
3006 blank_state = blank_normal_wait;
f324edc8 3007 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3008 }
3009
1da177e4 3010 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 3011 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 3012 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 3013 tty_port_init(&vc->port);
1da177e4 3014 visual_init(vc, currcons, 1);
a5f4f52e 3015 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 3016 vc_init(vc, vc->vc_rows, vc->vc_cols,
3017 currcons || !vc->vc_sw->con_save_screen);
3018 }
3019 currcons = fg_console = 0;
3020 master_display_fg = vc = vc_cons[currcons].d;
3021 set_origin(vc);
3022 save_screen(vc);
3023 gotoxy(vc, vc->vc_x, vc->vc_y);
3024 csi_J(vc, 0);
3025 update_screen(vc);
5da527aa 3026 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3027 vc->vc_can_do_color ? "colour" : "mono",
3028 display_desc, vc->vc_cols, vc->vc_rows);
3029 printable = 1;
1da177e4 3030
ac751efa 3031 console_unlock();
1da177e4
LT		 3032
3033#ifdef CONFIG_VT_CONSOLE
3034 register_console(&vt_console_driver);
3035#endif
3036 return 0;
3037}
3038console_initcall(con_init);
3039
b68e31d0 3040static const struct tty_operations con_ops = {
bc1e99d9 3041 .install = con_install,
1da177e4
LT		 3042 .open = con_open,
3043 .close = con_close,
3044 .write = con_write,
3045 .write_room = con_write_room,
3046 .put_char = con_put_char,
3047 .flush_chars = con_flush_chars,
3048 .chars_in_buffer = con_chars_in_buffer,
3049 .ioctl = vt_ioctl,
e9216651
AB		 3050#ifdef CONFIG_COMPAT
3051 .compat_ioctl = vt_compat_ioctl,
3052#endif
1da177e4
LT		 3053 .stop = con_stop,
3054 .start = con_start,
3055 .throttle = con_throttle,
3056 .unthrottle = con_unthrottle,
8c9a9dd0 3057 .resize = vt_resize,
feebed65 3058 .shutdown = con_shutdown
1da177e4
LT		 3059};
3060
d81ed103
AC		 3061static struct cdev vc0_cdev;
3062
fbc92a34
KS		 3063static ssize_t show_tty_active(struct device *dev,
3064 struct device_attribute *attr, char *buf)
3065{
3066 return sprintf(buf, "tty%d\n", fg_console + 1);
3067}
3068static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3069
1083a7be
TI		 3070static struct attribute *vt_dev_attrs[] = {
3071 &dev_attr_active.attr,
3072 NULL
3073};
3074
3075ATTRIBUTE_GROUPS(vt_dev);
3076
d81ed103 3077int __init vty_init(const struct file_operations *console_fops)
1da177e4 3078{
d81ed103
AC		 3079 cdev_init(&vc0_cdev, console_fops);
3080 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3081 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3082 panic("Couldn't register /dev/tty0 driver\n");
1083a7be
TI		 3083 tty0dev = device_create_with_groups(tty_class, NULL,
3084 MKDEV(TTY_MAJOR, 0), NULL,
3085 vt_dev_groups, "tty0");
fbc92a34
KS		 3086 if (IS_ERR(tty0dev))
3087 tty0dev = NULL;
d81ed103 3088
1da177e4
LT		 3089 vcs_init();
3090
3091 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3092 if (!console_driver)
3093 panic("Couldn't allocate console driver\n");
2f16669d 3094
1da177e4
LT		 3095 console_driver->name = "tty";
3096 console_driver->name_base = 1;
3097 console_driver->major = TTY_MAJOR;
3098 console_driver->minor_start = 1;
3099 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3100 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3101 if (default_utf8)
3102 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3103 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3104 tty_set_operations(console_driver, &con_ops);
3105 if (tty_register_driver(console_driver))
3106 panic("Couldn't register console driver\n");
1da177e4
LT		 3107 kbd_init();
3108 console_map_init();
1da177e4
LT		 3109#ifdef CONFIG_MDA_CONSOLE
3110 mda_console_init();
3111#endif
3112 return 0;
3113}
3114
3115#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3116
3117static struct class *vtconsole_class;
3118
50e244cc 3119static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3120 int deflt)
1da177e4 3121{
3e795de7
AD		 3122 struct module *owner = csw->owner;
3123 const char *desc = NULL;
3124 struct con_driver *con_driver;
3125 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3126
1da177e4
LT		 3127 if (!try_module_get(owner))
3128 return -ENODEV;
3129
50e244cc 3130 WARN_CONSOLE_UNLOCKED();
1c8ce271 3131
3e795de7
AD		 3132 /* check if driver is registered */
3133 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3134 con_driver = &registered_con_driver[i];
3135
3136 if (con_driver->con == csw) {
3137 desc = con_driver->desc;
3138 retval = 0;
3139 break;
3140 }
3141 }
3142
3143 if (retval)
3144 goto err;
3145
3146 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3147 csw->con_startup();
3148 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3149 }
1c8ce271 3150
1da177e4
LT		 3151 if (deflt) {
3152 if (conswitchp)
3153 module_put(conswitchp->owner);
1c8ce271 3154
1da177e4
LT		 3155 __module_get(owner);
3156 conswitchp = csw;
3157 }
3158
3e795de7
AD		 3159 first = max(first, con_driver->first);
3160 last = min(last, con_driver->last);
3161
1da177e4
LT		 3162 for (i = first; i <= last; i++) {
3163 int old_was_color;
3164 struct vc_data *vc = vc_cons[i].d;
3165
3166 if (con_driver_map[i])
3167 module_put(con_driver_map[i]->owner);
3168 __module_get(owner);
3169 con_driver_map[i] = csw;
3170
3171 if (!vc || !vc->vc_sw)
3172 continue;
3173
3174 j = i;
1c8ce271 3175
4ee1acce
DH		 3176 if (CON_IS_VISIBLE(vc)) {
3177 k = i;
1da177e4 3178 save_screen(vc);
4ee1acce
DH		 3179 }
3180
1da177e4
LT		 3181 old_was_color = vc->vc_can_do_color;
3182 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3183 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3184 visual_init(vc, i, 0);
1c8ce271 3185 set_origin(vc);
1da177e4
LT		 3186 update_attr(vc);
3187
3188 /* If the console changed between mono <-> color, then
3189 * the attributes in the screenbuf will be wrong. The
3190 * following resets all attributes to something sane.
3191 */
3192 if (old_was_color != vc->vc_can_do_color)
3193 clear_buffer_attributes(vc);
1da177e4 3194 }
4ee1acce 3195
1ffdda95 3196 pr_info("Console: switching ");
1da177e4
LT		 3197 if (!deflt)
3198 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3199 if (j >= 0) {
3200 struct vc_data *vc = vc_cons[j].d;
3201
1da177e4 3202 printk("to %s %s %dx%d\n",
4ee1acce
DH		 3203 vc->vc_can_do_color ? "colour" : "mono",
3204 desc, vc->vc_cols, vc->vc_rows);
3205
3206 if (k >= 0) {
3207 vc = vc_cons[k].d;
3208 update_screen(vc);
3209 }
3210 } else
1da177e4
LT		 3211 printk("to %s\n", desc);
3212
3e795de7
AD		 3213 retval = 0;
3214err:
1da177e4 3215 module_put(owner);
3e795de7
AD		 3216 return retval;
3217};
1da177e4 3218
50e244cc 3219
13ae6645 3220#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86
TI		 3221/* unlocked version of unbind_con_driver() */
3222int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3223{
3e795de7
AD		 3224 struct module *owner = csw->owner;
3225 const struct consw *defcsw = NULL;
3226 struct con_driver *con_driver = NULL, *con_back = NULL;
3227 int i, retval = -ENODEV;
1da177e4 3228
3e795de7
AD		 3229 if (!try_module_get(owner))
3230 return -ENODEV;
3231
e93a9a86 3232 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3233
3234 /* check if driver is registered and if it is unbindable */
3235 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3236 con_driver = &registered_con_driver[i];
3237
3238 if (con_driver->con == csw &&
6db4063c 3239 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3240 retval = 0;
3241 break;
3242 }
3243 }
3244
e93a9a86 3245 if (retval)
3e795de7 3246 goto err;
3e795de7 3247
6db4063c
AD		 3248 retval = -ENODEV;
3249
3e795de7
AD		 3250 /* check if backup driver exists */
3251 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3252 con_back = &registered_con_driver[i];
3253
249f7b3e 3254 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3255 defcsw = con_back->con;
3256 retval = 0;
3257 break;
3258 }
3259 }
3260
e93a9a86 3261 if (retval)
3e795de7 3262 goto err;
3e795de7 3263
e93a9a86 3264 if (!con_is_bound(csw))
3e795de7 3265 goto err;
3e795de7
AD		 3266
3267 first = max(first, con_driver->first);
3268 last = min(last, con_driver->last);
3269
3270 for (i = first; i <= last; i++) {
1da177e4
LT		 3271 if (con_driver_map[i] == csw) {
3272 module_put(csw->owner);
3273 con_driver_map[i] = NULL;
3274 }
3e795de7
AD		 3275 }
3276
3277 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3278 const struct consw *defconsw = conswitchp;
3279
3e795de7
AD		 3280 defcsw->con_startup();
3281 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3282 /*
3283 * vgacon may change the default driver to point
3284 * to dummycon, we restore it here...
3285 */
3286 conswitchp = defconsw;
3e795de7
AD		 3287 }
3288
3289 if (!con_is_bound(csw))
3290 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3291
6db4063c 3292 /* ignore return value, binding should not fail */
50e244cc 3293 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3294err:
3295 module_put(owner);
3296 return retval;
3297
3298}
e93a9a86 3299EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3300
6db4063c
AD		 3301static int vt_bind(struct con_driver *con)
3302{
3303 const struct consw *defcsw = NULL, *csw = NULL;
3304 int i, more = 1, first = -1, last = -1, deflt = 0;
3305
77232f79 3306 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3307 goto err;
3308
3309 csw = con->con;
3310
3311 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3312 struct con_driver *con = &registered_con_driver[i];
3313
3314 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3315 defcsw = con->con;
3316 break;
3317 }
3318 }
3319
3320 if (!defcsw)
3321 goto err;
3322
3323 while (more) {
3324 more = 0;
3325
3326 for (i = con->first; i <= con->last; i++) {
3327 if (con_driver_map[i] == defcsw) {
3328 if (first == -1)
3329 first = i;
3330 last = i;
3331 more = 1;
3332 } else if (first != -1)
3333 break;
3334 }
3335
3336 if (first == 0 && last == MAX_NR_CONSOLES -1)
3337 deflt = 1;
3338
4c215fe8 3339 if (first != -1)
c62a1e57 3340 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3341
3342 first = -1;
3343 last = -1;
3344 deflt = 0;
3345 }
3346
3347err:
3348 return 0;
3349}
3350
3351static int vt_unbind(struct con_driver *con)
3352{
3353 const struct consw *csw = NULL;
3354 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3355 int ret;
6db4063c 3356
77232f79 3357 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3358 goto err;
3359
3360 csw = con->con;
3361
3362 while (more) {
3363 more = 0;
3364
3365 for (i = con->first; i <= con->last; i++) {
3366 if (con_driver_map[i] == csw) {
3367 if (first == -1)
3368 first = i;
3369 last = i;
3370 more = 1;
3371 } else if (first != -1)
3372 break;
3373 }
3374
3375 if (first == 0 && last == MAX_NR_CONSOLES -1)
3376 deflt = 1;
3377
618f2b90 3378 if (first != -1) {
f418f2ec 3379 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3380 if (ret != 0)
3381 return ret;
618f2b90 3382 }
6db4063c
AD		 3383
3384 first = -1;
3385 last = -1;
3386 deflt = 0;
3387 }
3388
3389err:
3390 return 0;
3391}
13ae6645
AD		 3392#else
3393static inline int vt_bind(struct con_driver *con)
3394{
3395 return 0;
3396}
3397static inline int vt_unbind(struct con_driver *con)
3398{
3399 return 0;
3400}
3401#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3402
805952a8 3403static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3404 const char *buf, size_t count)
3405{
805952a8 3406 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3407 int bind = simple_strtoul(buf, NULL, 0);
3408
4c215fe8
ID		 3409 console_lock();
3410
6db4063c
AD		 3411 if (bind)
3412 vt_bind(con);
3413 else
3414 vt_unbind(con);
3415
4c215fe8
ID		 3416 console_unlock();
3417
6db4063c
AD		 3418 return count;
3419}
3420
805952a8
GKH		 3421static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3422 char *buf)
6db4063c 3423{
805952a8 3424 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3425 int bind = con_is_bound(con->con);
3426
3427 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3428}
3429
805952a8
GKH		 3430static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3431 char *buf)
6db4063c 3432{
805952a8 3433 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3434
3435 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3436 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3437 con->desc);
3438
3439}
3440
1083a7be
TI		 3441static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3442static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3443
3444static struct attribute *con_dev_attrs[] = {
3445 &dev_attr_bind.attr,
3446 &dev_attr_name.attr,
3447 NULL
6db4063c
AD		 3448};
3449
1083a7be
TI		 3450ATTRIBUTE_GROUPS(con_dev);
3451
805952a8 3452static int vtconsole_init_device(struct con_driver *con)
6db4063c 3453{
928e964f 3454 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3455 return 0;
6db4063c
AD		 3456}
3457
805952a8 3458static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3459{
1083a7be 3460 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3461}
3462
3e795de7
AD		 3463/**
3464 * con_is_bound - checks if driver is bound to the console
3465 * @csw: console driver
3466 *
3467 * RETURNS: zero if unbound, nonzero if bound
3468 *
3469 * Drivers can call this and if zero, they should release
3470 * all resources allocated on con_startup()
3471 */
3472int con_is_bound(const struct consw *csw)
3473{
3474 int i, bound = 0;
3475
3476 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3477 if (con_driver_map[i] == csw) {
3478 bound = 1;
3479 break;
3480 }
3481 }
3482
3483 return bound;
3484}
3485EXPORT_SYMBOL(con_is_bound);
3486
b45cfba4
JB		 3487/**
3488 * con_debug_enter - prepare the console for the kernel debugger
3489 * @sw: console driver
3490 *
3491 * Called when the console is taken over by the kernel debugger, this
3492 * function needs to save the current console state, then put the console
3493 * into a state suitable for the kernel debugger.
3494 *
3495 * RETURNS:
3496 * Zero on success, nonzero if a failure occurred when trying to prepare
3497 * the console for the debugger.
3498 */
3499int con_debug_enter(struct vc_data *vc)
3500{
3501 int ret = 0;
3502
3503 saved_fg_console = fg_console;
3504 saved_last_console = last_console;
3505 saved_want_console = want_console;
3506 saved_vc_mode = vc->vc_mode;
beed5336 3507 saved_console_blanked = console_blanked;
b45cfba4
JB		 3508 vc->vc_mode = KD_TEXT;
3509 console_blanked = 0;
3510 if (vc->vc_sw->con_debug_enter)
3511 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3512#ifdef CONFIG_KGDB_KDB
3513 /* Set the initial LINES variable if it is not already set */
3514 if (vc->vc_rows < 999) {
3515 int linecount;
3516 char lns[4];
3517 const char *setargs[3] = {
3518 "set",
3519 "LINES",
3520 lns,
3521 };
3522 if (kdbgetintenv(setargs[0], &linecount)) {
3523 snprintf(lns, 4, "%i", vc->vc_rows);
3524 kdb_set(2, setargs);
3525 }
3526 }
17b572e8
JW		 3527 if (vc->vc_cols < 999) {
3528 int colcount;
3529 char cols[4];
3530 const char *setargs[3] = {
3531 "set",
3532 "COLUMNS",
3533 cols,
3534 };
3535 if (kdbgetintenv(setargs[0], &colcount)) {
3536 snprintf(cols, 4, "%i", vc->vc_cols);
3537 kdb_set(2, setargs);
3538 }
3539 }
81d44507 3540#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3541 return ret;
3542}
3543EXPORT_SYMBOL_GPL(con_debug_enter);
3544
3545/**
3546 * con_debug_leave - restore console state
3547 * @sw: console driver
3548 *
3549 * Restore the console state to what it was before the kernel debugger
3550 * was invoked.
3551 *
3552 * RETURNS:
3553 * Zero on success, nonzero if a failure occurred when trying to restore
3554 * the console.
3555 */
3556int con_debug_leave(void)
3557{
3558 struct vc_data *vc;
3559 int ret = 0;
3560
3561 fg_console = saved_fg_console;
3562 last_console = saved_last_console;
3563 want_console = saved_want_console;
beed5336 3564 console_blanked = saved_console_blanked;
b45cfba4
JB		 3565 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3566
3567 vc = vc_cons[fg_console].d;
3568 if (vc->vc_sw->con_debug_leave)
3569 ret = vc->vc_sw->con_debug_leave(vc);
3570 return ret;
3571}
3572EXPORT_SYMBOL_GPL(con_debug_leave);
3573
50e244cc 3574static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 3575{
3576 struct module *owner = csw->owner;
3577 struct con_driver *con_driver;
3578 const char *desc;
96317e9e 3579 int i, retval;
3e795de7 3580
50e244cc
AC		 3581 WARN_CONSOLE_UNLOCKED();
3582
3e795de7
AD		 3583 if (!try_module_get(owner))
3584 return -ENODEV;
3585
3e795de7
AD		 3586 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3587 con_driver = &registered_con_driver[i];
3588
3589 /* already registered */
96317e9e 3590 if (con_driver->con == csw) {
c55c63c6 3591 retval = -EBUSY;
96317e9e
JS		 3592 goto err;
3593 }
3e795de7
AD		 3594 }
3595
3e795de7 3596 desc = csw->con_startup();
6798df4c
JS		 3597 if (!desc) {
3598 retval = -ENODEV;
3e795de7 3599 goto err;
6798df4c 3600 }
3e795de7
AD		 3601
3602 retval = -EINVAL;
3603
3604 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3605 con_driver = &registered_con_driver[i];
3606
d364b5c3
ID		 3607 if (con_driver->con == NULL &&
3608 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 3609 con_driver->con = csw;
3610 con_driver->desc = desc;
6db4063c
AD		 3611 con_driver->node = i;
3612 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3613 CON_DRIVER_FLAG_INIT;
3614 con_driver->first = first;
3615 con_driver->last = last;
3616 retval = 0;
3617 break;
3618 }
3619 }
3620
6db4063c
AD		 3621 if (retval)
3622 goto err;
3623
1083a7be
TI		 3624 con_driver->dev =
3625 device_create_with_groups(vtconsole_class, NULL,
3626 MKDEV(0, con_driver->node),
3627 con_driver, con_dev_groups,
3628 "vtcon%i", con_driver->node);
805952a8
GKH		 3629 if (IS_ERR(con_driver->dev)) {
3630 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3631 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3632 PTR_ERR(con_driver->dev));
3633 con_driver->dev = NULL;
6db4063c 3634 } else {
805952a8 3635 vtconsole_init_device(con_driver);
6db4063c 3636 }
928e964f 3637
3e795de7 3638err:
3e795de7
AD		 3639 module_put(owner);
3640 return retval;
3641}
50e244cc 3642
3e795de7
AD		 3643
3644/**
50539dd4 3645 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 3646 * @csw: console driver
3647 *
3648 * DESCRIPTION: All drivers that registers to the console layer must
3649 * call this function upon exit, or if the console driver is in a state
3650 * where it won't be able to handle console services, such as the
3651 * framebuffer console without loaded framebuffer drivers.
3652 *
3653 * The driver must unbind first prior to unregistration.
3654 */
e93a9a86
TI		 3655int do_unregister_con_driver(const struct consw *csw)
3656{
d9c660e7 3657 int i;
3e795de7
AD		 3658
3659 /* cannot unregister a bound driver */
3660 if (con_is_bound(csw))
d9c660e7
DV		 3661 return -EBUSY;
3662
3663 if (csw == conswitchp)
3664 return -EINVAL;
3e795de7
AD		 3665
3666 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3667 struct con_driver *con_driver = &registered_con_driver[i];
3668
2cf30f75 3669 if (con_driver->con == csw) {
d364b5c3
ID		 3670 /*
3671 * Defer the removal of the sysfs entries since that
3672 * will acquire the kernfs s_active lock and we can't
3673 * acquire this lock while holding the console lock:
3674 * the unbind sysfs entry imposes already the opposite
3675 * order. Reset con already here to prevent any later
3676 * lookup to succeed and mark this slot as zombie, so
3677 * it won't get reused until we complete the removal
3678 * in the deferred work.
3679 */
3e795de7 3680 con_driver->con = NULL;
d364b5c3
ID		 3681 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3682 schedule_work(&con_driver_unregister_work);
3683
d9c660e7 3684 return 0;
3e795de7
AD		 3685 }
3686 }
d9c660e7
DV		 3687
3688 return -ENODEV;
3e795de7 3689}
e93a9a86 3690EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 3691
d364b5c3
ID		 3692static void con_driver_unregister_callback(struct work_struct *ignored)
3693{
3694 int i;
3695
3696 console_lock();
3697
3698 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3699 struct con_driver *con_driver = &registered_con_driver[i];
3700
3701 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3702 continue;
3703
3704 console_unlock();
3705
3706 vtconsole_deinit_device(con_driver);
3707 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3708
3709 console_lock();
3710
3711 if (WARN_ON_ONCE(con_driver->con))
3712 con_driver->con = NULL;
3713 con_driver->desc = NULL;
3714 con_driver->dev = NULL;
3715 con_driver->node = 0;
3716 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3717 con_driver->flag = 0;
3718 con_driver->first = 0;
3719 con_driver->last = 0;
3720 }
3721
3722 console_unlock();
3723}
3724
3e795de7
AD		 3725/*
3726 * If we support more console drivers, this function is used
3727 * when a driver wants to take over some existing consoles
3728 * and become default driver for newly opened ones.
3729 *
155957f5 3730 * do_take_over_console is basically a register followed by unbind
50e244cc
AC		 3731 */
3732int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3733{
3734 int err;
3735
3736 err = do_register_con_driver(csw, first, last);
3737 /*
3738 * If we get an busy error we still want to bind the console driver
3739 * and return success, as we may have unbound the console driver
3740 * but not unregistered it.
3741 */
3742 if (err == -EBUSY)
3743 err = 0;
3744 if (!err)
3745 do_bind_con_driver(csw, first, last, deflt);
3746
3747 return err;
3748}
3749EXPORT_SYMBOL_GPL(do_take_over_console);
3750
3e795de7
AD		 3751
3752/*
3753 * give_up_console is a wrapper to unregister_con_driver. It will only
3754 * work if driver is fully unbound.
3755 */
3756void give_up_console(const struct consw *csw)
3757{
70125e76
WY		 3758 console_lock();
3759 do_unregister_con_driver(csw);
3760 console_unlock();
3e795de7
AD		 3761}
3762
6db4063c 3763static int __init vtconsole_class_init(void)
3e795de7 3764{
6db4063c 3765 int i;
3e795de7 3766
6db4063c
AD		 3767 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3768 if (IS_ERR(vtconsole_class)) {
3769 printk(KERN_WARNING "Unable to create vt console class; "
3770 "errno = %ld\n", PTR_ERR(vtconsole_class));
3771 vtconsole_class = NULL;
3772 }
3e795de7 3773
6db4063c 3774 /* Add system drivers to sysfs */
3e795de7
AD		 3775 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3776 struct con_driver *con = &registered_con_driver[i];
3777
805952a8 3778 if (con->con && !con->dev) {
1083a7be
TI		 3779 con->dev =
3780 device_create_with_groups(vtconsole_class, NULL,
3781 MKDEV(0, con->node),
3782 con, con_dev_groups,
3783 "vtcon%i", con->node);
6db4063c 3784
805952a8 3785 if (IS_ERR(con->dev)) {
6db4063c 3786 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3787 "device for %s; errno = %ld\n",
3788 con->desc, PTR_ERR(con->dev));
3789 con->dev = NULL;
6db4063c 3790 } else {
805952a8 3791 vtconsole_init_device(con);
6db4063c 3792 }
3e795de7 3793 }
3e795de7
AD		 3794 }
3795
3e795de7
AD		 3796 return 0;
3797}
6db4063c 3798postcore_initcall(vtconsole_class_init);
3e795de7 3799
1da177e4
LT		 3800#endif
3801
3802/*
3803 * Screen blanking
3804 */
3805
403aac96 3806static int set_vesa_blanking(char __user *p)
1da177e4 3807{
403aac96
YY		 3808 unsigned int mode;
3809
3810 if (get_user(mode, p + 1))
3811 return -EFAULT;
3812
3813 vesa_blank_mode = (mode < 4) ? mode : 0;
3814 return 0;
1da177e4
LT		 3815}
3816
1da177e4
LT		 3817void do_blank_screen(int entering_gfx)
3818{
3819 struct vc_data *vc = vc_cons[fg_console].d;
3820 int i;
3821
3822 WARN_CONSOLE_UNLOCKED();
3823
3824 if (console_blanked) {
3825 if (blank_state == blank_vesa_wait) {
3826 blank_state = blank_off;
d060a321 3827 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3828 }
3829 return;
3830 }
1da177e4
LT		 3831
3832 /* entering graphics mode? */
3833 if (entering_gfx) {
3834 hide_cursor(vc);
3835 save_screen(vc);
3836 vc->vc_sw->con_blank(vc, -1, 1);
3837 console_blanked = fg_console + 1;
b6e8f00f 3838 blank_state = blank_off;
1da177e4
LT		 3839 set_origin(vc);
3840 return;
3841 }
3842
b6e8f00f 3843 if (blank_state != blank_normal_wait)
3844 return;
3845 blank_state = blank_off;
3846
1da177e4
LT		 3847 /* don't blank graphics */
3848 if (vc->vc_mode != KD_TEXT) {
3849 console_blanked = fg_console + 1;
3850 return;
3851 }
3852
3853 hide_cursor(vc);
3854 del_timer_sync(&console_timer);
3855 blank_timer_expired = 0;
3856
3857 save_screen(vc);
3858 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3859 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3860 console_blanked = fg_console + 1;
3861 if (i)
3862 set_origin(vc);
3863
3864 if (console_blank_hook && console_blank_hook(1))
3865 return;
3866
d060a321 3867 if (vesa_off_interval && vesa_blank_mode) {
030babac 3868 blank_state = blank_vesa_wait;
1da177e4
LT		 3869 mod_timer(&console_timer, jiffies + vesa_off_interval);
3870 }
8b92e87d 3871 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3872}
3873EXPORT_SYMBOL(do_blank_screen);
3874
3875/*
3876 * Called by timer as well as from vt_console_driver
3877 */
3878void do_unblank_screen(int leaving_gfx)
3879{
3880 struct vc_data *vc;
3881
3882 /* This should now always be called from a "sane" (read: can schedule)
3883 * context for the sake of the low level drivers, except in the special
3884 * case of oops_in_progress
3885 */
3886 if (!oops_in_progress)
3887 might_sleep();
3888
3889 WARN_CONSOLE_UNLOCKED();
3890
3891 ignore_poke = 0;
3892 if (!console_blanked)
3893 return;
3894 if (!vc_cons_allocated(fg_console)) {
3895 /* impossible */
e620e548
JP		 3896 pr_warn("unblank_screen: tty %d not allocated ??\n",
3897 fg_console + 1);
1da177e4
LT		 3898 return;
3899 }
3900 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3901 /* Try to unblank in oops case too */
3902 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3903 return; /* but leave console_blanked != 0 */
3904
3905 if (blankinterval) {
f324edc8 3906 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3907 blank_state = blank_normal_wait;
3908 }
3909
3910 console_blanked = 0;
8fd4bd22 3911 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3912 /* Low-level driver cannot restore -> do it ourselves */
3913 update_screen(vc);
3914 if (console_blank_hook)
3915 console_blank_hook(0);
3916 set_palette(vc);
3917 set_cursor(vc);
8b92e87d 3918 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3919}
3920EXPORT_SYMBOL(do_unblank_screen);
3921
3922/*
3923 * This is called by the outside world to cause a forced unblank, mostly for
3924 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3925 * call it with 1 as an argument and so force a mode restore... that may kill
3926 * X or at least garbage the screen but would also make the Oops visible...
3927 */
3928void unblank_screen(void)
3929{
3930 do_unblank_screen(0);
3931}
3932
3933/*
70522e12 3934 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3935 * (console operations can still happen at irq time, but only from printk which
70522e12 3936 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3937 */
3938static void blank_screen_t(unsigned long dummy)
3939{
cc63b1e1 3940 if (unlikely(!keventd_up())) {
f324edc8 3941 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3942 return;
3943 }
1da177e4
LT		 3944 blank_timer_expired = 1;
3945 schedule_work(&console_work);
3946}
3947
3948void poke_blanked_console(void)
3949{
3950 WARN_CONSOLE_UNLOCKED();
3951
3952 /* Add this so we quickly catch whoever might call us in a non
3953 * safe context. Nowadays, unblank_screen() isn't to be called in
3954 * atomic contexts and is allowed to schedule (with the special case
3955 * of oops_in_progress, but that isn't of any concern for this
3956 * function. --BenH.
3957 */
3958 might_sleep();
3959
3960 /* This isn't perfectly race free, but a race here would be mostly harmless,
3961 * at worse, we'll do a spurrious blank and it's unlikely
3962 */
3963 del_timer(&console_timer);
3964 blank_timer_expired = 0;
3965
3966 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3967 return;
3968 if (console_blanked)
3969 unblank_screen();
3970 else if (blankinterval) {
f324edc8 3971 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3972 blank_state = blank_normal_wait;
3973 }
3974}
3975
3976/*
3977 * Palettes
3978 */
3979
3980static void set_palette(struct vc_data *vc)
3981{
3982 WARN_CONSOLE_UNLOCKED();
3983
3984 if (vc->vc_mode != KD_GRAPHICS)
3985 vc->vc_sw->con_set_palette(vc, color_table);
3986}
3987
1da177e4
LT		 3988/*
3989 * Load palette into the DAC registers. arg points to a colour
3990 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3991 */
3992
3993int con_set_cmap(unsigned char __user *arg)
3994{
871bdea6
MG		 3995 int i, j, k;
3996 unsigned char colormap[3*16];
3997
3998 if (copy_from_user(colormap, arg, sizeof(colormap)))
3999 return -EFAULT;
1da177e4 4000
ac751efa 4001 console_lock();
871bdea6
MG		 4002 for (i = k = 0; i < 16; i++) {
4003 default_red[i] = colormap[k++];
4004 default_grn[i] = colormap[k++];
4005 default_blu[i] = colormap[k++];
4006 }
4007 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4008 if (!vc_cons_allocated(i))
4009 continue;
4010 for (j = k = 0; j < 16; j++) {
4011 vc_cons[i].d->vc_palette[k++] = default_red[j];
4012 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4013 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4014 }
4015 set_palette(vc_cons[i].d);
4016 }
ac751efa 4017 console_unlock();
1da177e4 4018
871bdea6 4019 return 0;
1da177e4
LT		 4020}
4021
4022int con_get_cmap(unsigned char __user *arg)
4023{
871bdea6
MG		 4024 int i, k;
4025 unsigned char colormap[3*16];
1da177e4 4026
ac751efa 4027 console_lock();
871bdea6
MG		 4028 for (i = k = 0; i < 16; i++) {
4029 colormap[k++] = default_red[i];
4030 colormap[k++] = default_grn[i];
4031 colormap[k++] = default_blu[i];
4032 }
ac751efa 4033 console_unlock();
1da177e4 4034
871bdea6
MG		 4035 if (copy_to_user(arg, colormap, sizeof(colormap)))
4036 return -EFAULT;
4037
4038 return 0;
1da177e4
LT		 4039}
4040
4041void reset_palette(struct vc_data *vc)
4042{
4043 int j, k;
4044 for (j=k=0; j<16; j++) {
4045 vc->vc_palette[k++] = default_red[j];
4046 vc->vc_palette[k++] = default_grn[j];
4047 vc->vc_palette[k++] = default_blu[j];
4048 }
4049 set_palette(vc);
4050}
4051
4052/*
4053 * Font switching
4054 *
4055 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4056 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4057 * depending on width) reserved for each character which is kinda wasty, but
4058 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4059 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4060 * format (maybe we should add a `fontoffset' field to the `display'
4061 * structure so we won't have to convert the fontdata all the time.
4062 * /Jes
4063 */
4064
4065#define max_font_size 65536
4066
4067static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4068{
4069 struct console_font font;
4070 int rc = -EINVAL;
4071 int c;
4072
1da177e4
LT		 4073 if (op->data) {
4074 font.data = kmalloc(max_font_size, GFP_KERNEL);
4075 if (!font.data)
4076 return -ENOMEM;
4077 } else
4078 font.data = NULL;
4079
ac751efa 4080 console_lock();
edab558f
AC		 4081 if (vc->vc_mode != KD_TEXT)
4082 rc = -EINVAL;
4083 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4084 rc = vc->vc_sw->con_font_get(vc, &font);
4085 else
4086 rc = -ENOSYS;
ac751efa 4087 console_unlock();
1da177e4
LT		 4088
4089 if (rc)
4090 goto out;
4091
4092 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4093
1da177e4
LT		 4094 if (op->data && font.charcount > op->charcount)
4095 rc = -ENOSPC;
4096 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4097 if (font.width > op->width || font.height > op->height)
4098 rc = -ENOSPC;
4099 } else {
4100 if (font.width != 8)
4101 rc = -EIO;
4102 else if ((op->height && font.height > op->height) ||
4103 font.height > 32)
4104 rc = -ENOSPC;
4105 }
4106 if (rc)
4107 goto out;
4108
4109 op->height = font.height;
4110 op->width = font.width;
4111 op->charcount = font.charcount;
4112
4113 if (op->data && copy_to_user(op->data, font.data, c))
4114 rc = -EFAULT;
4115
4116out:
4117 kfree(font.data);
4118 return rc;
4119}
4120
4121static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4122{
4123 struct console_font font;
4124 int rc = -EINVAL;
4125 int size;
4126
4127 if (vc->vc_mode != KD_TEXT)
4128 return -EINVAL;
4129 if (!op->data)
4130 return -EINVAL;
4131 if (op->charcount > 512)
4132 return -EINVAL;
4133 if (!op->height) { /* Need to guess font height [compat] */
4134 int h, i;
4135 u8 __user *charmap = op->data;
4136 u8 tmp;
4137
4138 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4139 so that we can get rid of this soon */
4140 if (!(op->flags & KD_FONT_FLAG_OLD))
4141 return -EINVAL;
4142 for (h = 32; h > 0; h--)
4143 for (i = 0; i < op->charcount; i++) {
4144 if (get_user(tmp, &charmap[32*i+h-1]))
4145 return -EFAULT;
4146 if (tmp)
4147 goto nonzero;
4148 }
4149 return -EINVAL;
4150 nonzero:
4151 op->height = h;
4152 }
4153 if (op->width <= 0 || op->width > 32 || op->height > 32)
4154 return -EINVAL;
4155 size = (op->width+7)/8 * 32 * op->charcount;
4156 if (size > max_font_size)
4157 return -ENOSPC;
4158 font.charcount = op->charcount;
4159 font.height = op->height;
4160 font.width = op->width;
9b71ca20
JL		 4161 font.data = memdup_user(op->data, size);
4162 if (IS_ERR(font.data))
4163 return PTR_ERR(font.data);
ac751efa 4164 console_lock();
edab558f
AC		 4165 if (vc->vc_mode != KD_TEXT)
4166 rc = -EINVAL;
4167 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4168 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4169 else
4170 rc = -ENOSYS;
ac751efa 4171 console_unlock();
1da177e4
LT		 4172 kfree(font.data);
4173 return rc;
4174}
4175
4176static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4177{
4178 struct console_font font = {.width = op->width, .height = op->height};
4179 char name[MAX_FONT_NAME];
4180 char *s = name;
4181 int rc;
4182
1da177e4
LT		 4183
4184 if (!op->data)
4185 s = NULL;
4186 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4187 return -EFAULT;
4188 else
4189 name[MAX_FONT_NAME - 1] = 0;
4190
ac751efa 4191 console_lock();
edab558f
AC		 4192 if (vc->vc_mode != KD_TEXT) {
4193 console_unlock();
4194 return -EINVAL;
4195 }
1da177e4
LT		 4196 if (vc->vc_sw->con_font_default)
4197 rc = vc->vc_sw->con_font_default(vc, &font, s);
4198 else
4199 rc = -ENOSYS;
ac751efa 4200 console_unlock();
1da177e4
LT		 4201 if (!rc) {
4202 op->width = font.width;
4203 op->height = font.height;
4204 }
4205 return rc;
4206}
4207
4208static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4209{
4210 int con = op->height;
4211 int rc;
4212
1da177e4 4213
ac751efa 4214 console_lock();
edab558f
AC		 4215 if (vc->vc_mode != KD_TEXT)
4216 rc = -EINVAL;
4217 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4218 rc = -ENOSYS;
4219 else if (con < 0 || !vc_cons_allocated(con))
4220 rc = -ENOTTY;
4221 else if (con == vc->vc_num) /* nothing to do */
4222 rc = 0;
4223 else
4224 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4225 console_unlock();
1da177e4
LT		 4226 return rc;
4227}
4228
4229int con_font_op(struct vc_data *vc, struct console_font_op *op)
4230{
4231 switch (op->op) {
4232 case KD_FONT_OP_SET:
4233 return con_font_set(vc, op);
4234 case KD_FONT_OP_GET:
4235 return con_font_get(vc, op);
4236 case KD_FONT_OP_SET_DEFAULT:
4237 return con_font_default(vc, op);
4238 case KD_FONT_OP_COPY:
4239 return con_font_copy(vc, op);
4240 }
4241 return -ENOSYS;
4242}
4243
4244/*
4245 * Interface exported to selection and vcs.
4246 */
4247
4248/* used by selection */
4249u16 screen_glyph(struct vc_data *vc, int offset)
4250{
4251 u16 w = scr_readw(screenpos(vc, offset, 1));
4252 u16 c = w & 0xff;
4253
4254 if (w & vc->vc_hi_font_mask)
4255 c |= 0x100;
4256 return c;
4257}
f7511d5f 4258EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4259
4260/* used by vcs - note the word offset */
4261unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4262{
4263 return screenpos(vc, 2 * w_offset, viewed);
4264}
88867e3d 4265EXPORT_SYMBOL_GPL(screen_pos);
1da177e4
LT		 4266
4267void getconsxy(struct vc_data *vc, unsigned char *p)
4268{
4269 p[0] = vc->vc_x;
4270 p[1] = vc->vc_y;
4271}
4272
4273void putconsxy(struct vc_data *vc, unsigned char *p)
4274{
9477e260 4275 hide_cursor(vc);
1da177e4
LT		 4276 gotoxy(vc, p[0], p[1]);
4277 set_cursor(vc);
4278}
4279
4280u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4281{
4282 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4283 return softcursor_original;
4284 return scr_readw(org);
4285}
4286
4287void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4288{
4289 scr_writew(val, org);
4290 if ((unsigned long)org == vc->vc_pos) {
4291 softcursor_original = -1;
4292 add_softcursor(vc);
4293 }
4294}
4295
432c9ed2
NP		 4296void vcs_scr_updated(struct vc_data *vc)
4297{
4298 notify_update(vc);
4299}
4300
1da177e4
LT		 4301/*
4302 * Visible symbols for modules
4303 */
4304
4305EXPORT_SYMBOL(color_table);
4306EXPORT_SYMBOL(default_red);
4307EXPORT_SYMBOL(default_grn);
4308EXPORT_SYMBOL(default_blu);
4309EXPORT_SYMBOL(update_region);
4310EXPORT_SYMBOL(redraw_screen);
4311EXPORT_SYMBOL(vc_resize);
4312EXPORT_SYMBOL(fg_console);
4313EXPORT_SYMBOL(console_blank_hook);
4314EXPORT_SYMBOL(console_blanked);
4315EXPORT_SYMBOL(vc_cons);
f6c06b68 4316EXPORT_SYMBOL(global_cursor_default);
1da177e4 4317#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4318EXPORT_SYMBOL(give_up_console);
4319#endif
Linux kernel - Deliverables
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