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tty: vt, do not pass structure over stack
[thirdparty/linux.git] / drivers / tty / vt / vt.c
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1da177e4 1/*
1da177e4
LT		 2 * Copyright (C) 1991, 1992 Linus Torvalds
3 */
4
5/*
6 * Hopefully this will be a rather complete VT102 implementation.
7 *
8 * Beeping thanks to John T Kohl.
9 *
10 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
11 * Chars, and VT100 enhancements by Peter MacDonald.
12 *
13 * Copy and paste function by Andrew Haylett,
14 * some enhancements by Alessandro Rubini.
15 *
16 * Code to check for different video-cards mostly by Galen Hunt,
17 * <g-hunt@ee.utah.edu>
18 *
19 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
20 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
21 *
22 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
23 * Resizing of consoles, aeb, 940926
24 *
25 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
26 * <poe@daimi.aau.dk>
27 *
28 * User-defined bell sound, new setterm control sequences and printk
29 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
30 *
31 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
32 *
33 * Merge with the abstract console driver by Geert Uytterhoeven
34 * <geert@linux-m68k.org>, Jan 1997.
35 *
36 * Original m68k console driver modifications by
37 *
38 * - Arno Griffioen <arno@usn.nl>
39 * - David Carter <carter@cs.bris.ac.uk>
40 *
41 * The abstract console driver provides a generic interface for a text
42 * console. It supports VGA text mode, frame buffer based graphical consoles
43 * and special graphics processors that are only accessible through some
44 * registers (e.g. a TMS340x0 GSP).
45 *
46 * The interface to the hardware is specified using a special structure
47 * (struct consw) which contains function pointers to console operations
48 * (see <linux/console.h> for more information).
49 *
50 * Support for changeable cursor shape
51 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
52 *
53 * Ported to i386 and con_scrolldelta fixed
54 * by Emmanuel Marty <core@ggi-project.org>, April 1998
55 *
56 * Resurrected character buffers in videoram plus lots of other trickery
57 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
58 *
59 * Removed old-style timers, introduced console_timer, made timer
e1f8e874 60 * deletion SMP-safe. 17Jun00, Andrew Morton
1da177e4
LT		 61 *
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
d4328b40
AT		 64 *
65 * Fixed UTF-8 mode so alternate charset modes always work according
66 * to control sequences interpreted in do_con_trol function
67 * preserving backward VT100 semigraphics compatibility,
68 * malformed UTF sequences represented as sequences of replacement glyphs,
69 * original codes or '?' as a last resort if replacement glyph is undefined
70 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
1da177e4
LT		 71 */
72
73#include <linux/module.h>
74#include <linux/types.h>
75#include <linux/sched.h>
76#include <linux/tty.h>
77#include <linux/tty_flip.h>
78#include <linux/kernel.h>
79#include <linux/string.h>
80#include <linux/errno.h>
81#include <linux/kd.h>
82#include <linux/slab.h>
83#include <linux/major.h>
84#include <linux/mm.h>
85#include <linux/console.h>
86#include <linux/init.h>
c831c338 87#include <linux/mutex.h>
1da177e4
LT		 88#include <linux/vt_kern.h>
89#include <linux/selection.h>
90#include <linux/tiocl.h>
91#include <linux/kbd_kern.h>
92#include <linux/consolemap.h>
93#include <linux/timer.h>
94#include <linux/interrupt.h>
1da177e4 95#include <linux/workqueue.h>
1da177e4
LT		 96#include <linux/pm.h>
97#include <linux/font.h>
98#include <linux/bitops.h>
b293d758 99#include <linux/notifier.h>
d81ed103
AC		 100#include <linux/device.h>
101#include <linux/io.h>
d81ed103 102#include <linux/uaccess.h>
81d44507 103#include <linux/kdb.h>
74c807ce 104#include <linux/ctype.h>
1da177e4 105
3e795de7 106#define MAX_NR_CON_DRIVER 16
1da177e4 107
6db4063c 108#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 109#define CON_DRIVER_FLAG_INIT 2
110#define CON_DRIVER_FLAG_ATTR 4
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)
f700d6e5 281#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
1da177e4
LT		 282
283static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
284{
285 unsigned short *p;
286
287 if (!viewed)
288 p = (unsigned short *)(vc->vc_origin + offset);
289 else if (!vc->vc_sw->con_screen_pos)
290 p = (unsigned short *)(vc->vc_visible_origin + offset);
291 else
292 p = vc->vc_sw->con_screen_pos(vc, offset);
293 return p;
294}
295
e33ac1c1 296/* Called from the keyboard irq path.. */
1da177e4
LT		 297static inline void scrolldelta(int lines)
298{
e33ac1c1
AC		 299 /* FIXME */
300 /* scrolldelta needs some kind of consistency lock, but the BKL was
301 and still is not protecting versus the scheduled back end */
1da177e4
LT		 302 scrollback_delta += lines;
303 schedule_console_callback();
304}
305
306void schedule_console_callback(void)
307{
308 schedule_work(&console_work);
309}
310
311static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
312{
313 unsigned short *d, *s;
314
315 if (t+nr >= b)
316 nr = b - t - 1;
317 if (b > vc->vc_rows || t >= b || nr < 1)
318 return;
319 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
320 return;
321 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
322 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
323 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
386f40c8 324 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
1da177e4
LT		 325 vc->vc_size_row * nr);
326}
327
328static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
329{
330 unsigned short *s;
331 unsigned int step;
332
333 if (t+nr >= b)
334 nr = b - t - 1;
335 if (b > vc->vc_rows || t >= b || nr < 1)
336 return;
337 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
338 return;
339 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
340 step = vc->vc_cols * nr;
341 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
93f78da4 342 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
1da177e4
LT		 343}
344
345static void do_update_region(struct vc_data *vc, unsigned long start, int count)
346{
1da177e4
LT		 347 unsigned int xx, yy, offset;
348 u16 *p;
349
350 p = (u16 *) start;
351 if (!vc->vc_sw->con_getxy) {
352 offset = (start - vc->vc_origin) / 2;
353 xx = offset % vc->vc_cols;
354 yy = offset / vc->vc_cols;
355 } else {
356 int nxx, nyy;
357 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
358 xx = nxx; yy = nyy;
359 }
360 for(;;) {
361 u16 attrib = scr_readw(p) & 0xff00;
362 int startx = xx;
363 u16 *q = p;
364 while (xx < vc->vc_cols && count) {
365 if (attrib != (scr_readw(p) & 0xff00)) {
366 if (p > q)
367 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
368 startx = xx;
369 q = p;
370 attrib = scr_readw(p) & 0xff00;
371 }
372 p++;
373 xx++;
374 count--;
375 }
376 if (p > q)
377 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
378 if (!count)
379 break;
380 xx = 0;
381 yy++;
382 if (vc->vc_sw->con_getxy) {
383 p = (u16 *)start;
384 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
385 }
386 }
1da177e4
LT		 387}
388
389void update_region(struct vc_data *vc, unsigned long start, int count)
390{
391 WARN_CONSOLE_UNLOCKED();
392
393 if (DO_UPDATE(vc)) {
394 hide_cursor(vc);
395 do_update_region(vc, start, count);
396 set_cursor(vc);
397 }
398}
399
400/* Structure of attributes is hardware-dependent */
401
fa6ce9ab
JE		 402static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
403 u8 _underline, u8 _reverse, u8 _italic)
1da177e4
LT		 404{
405 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 406 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
407 _blink, _underline, _reverse, _italic);
1da177e4 408
1da177e4
LT		 409/*
410 * ++roman: I completely changed the attribute format for monochrome
411 * mode (!can_do_color). The formerly used MDA (monochrome display
412 * adapter) format didn't allow the combination of certain effects.
413 * Now the attribute is just a bit vector:
414 * Bit 0..1: intensity (0..2)
415 * Bit 2 : underline
416 * Bit 3 : reverse
417 * Bit 7 : blink
418 */
419 {
c9e587ab 420 u8 a = _color;
1da177e4
LT		 421 if (!vc->vc_can_do_color)
422 return _intensity |
fa6ce9ab 423 (_italic ? 2 : 0) |
1da177e4
LT		 424 (_underline ? 4 : 0) |
425 (_reverse ? 8 : 0) |
426 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 427 if (_italic)
428 a = (a & 0xF0) | vc->vc_itcolor;
429 else if (_underline)
1da177e4
LT		 430 a = (a & 0xf0) | vc->vc_ulcolor;
431 else if (_intensity == 0)
432 a = (a & 0xf0) | vc->vc_ulcolor;
433 if (_reverse)
434 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
435 if (_blink)
436 a ^= 0x80;
437 if (_intensity == 2)
438 a ^= 0x08;
439 if (vc->vc_hi_font_mask == 0x100)
440 a <<= 1;
441 return a;
442 }
1da177e4
LT		 443}
444
445static void update_attr(struct vc_data *vc)
446{
fa6ce9ab
JE		 447 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
448 vc->vc_blink, vc->vc_underline,
449 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
450 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 451}
452
453/* Note: inverting the screen twice should revert to the original state */
454void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
455{
456 unsigned short *p;
457
458 WARN_CONSOLE_UNLOCKED();
459
460 count /= 2;
461 p = screenpos(vc, offset, viewed);
6af39ed3 462 if (vc->vc_sw->con_invert_region) {
1da177e4 463 vc->vc_sw->con_invert_region(vc, p, count);
6af39ed3 464 } else {
1da177e4
LT		 465 u16 *q = p;
466 int cnt = count;
467 u16 a;
468
469 if (!vc->vc_can_do_color) {
470 while (cnt--) {
471 a = scr_readw(q);
472 a ^= 0x0800;
473 scr_writew(a, q);
474 q++;
475 }
476 } else if (vc->vc_hi_font_mask == 0x100) {
477 while (cnt--) {
478 a = scr_readw(q);
479 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
480 scr_writew(a, q);
481 q++;
482 }
483 } else {
484 while (cnt--) {
485 a = scr_readw(q);
486 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
487 scr_writew(a, q);
488 q++;
489 }
490 }
491 }
6af39ed3 492
1da177e4
LT		 493 if (DO_UPDATE(vc))
494 do_update_region(vc, (unsigned long) p, count);
19e3ae6b 495 notify_update(vc);
1da177e4
LT		 496}
497
498/* used by selection: complement pointer position */
499void complement_pos(struct vc_data *vc, int offset)
500{
414edcd3 501 static int old_offset = -1;
1da177e4
LT		 502 static unsigned short old;
503 static unsigned short oldx, oldy;
504
505 WARN_CONSOLE_UNLOCKED();
506
414edcd3
AD		 507 if (old_offset != -1 && old_offset >= 0 &&
508 old_offset < vc->vc_screenbuf_size) {
509 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 510 if (DO_UPDATE(vc))
511 vc->vc_sw->con_putc(vc, old, oldy, oldx);
19e3ae6b 512 notify_update(vc);
1da177e4 513 }
414edcd3
AD		 514
515 old_offset = offset;
516
517 if (offset != -1 && offset >= 0 &&
518 offset < vc->vc_screenbuf_size) {
1da177e4 519 unsigned short new;
414edcd3 520 unsigned short *p;
1da177e4
LT		 521 p = screenpos(vc, offset, 1);
522 old = scr_readw(p);
523 new = old ^ vc->vc_complement_mask;
524 scr_writew(new, p);
525 if (DO_UPDATE(vc)) {
526 oldx = (offset >> 1) % vc->vc_cols;
527 oldy = (offset >> 1) / vc->vc_cols;
528 vc->vc_sw->con_putc(vc, new, oldy, oldx);
529 }
19e3ae6b 530 notify_update(vc);
1da177e4
LT		 531 }
532}
533
534static void insert_char(struct vc_data *vc, unsigned int nr)
535{
81732c3b 536 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 537
a883b70d 538 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b 539 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
1da177e4 540 vc->vc_need_wrap = 0;
81732c3b
JFM		 541 if (DO_UPDATE(vc))
542 do_update_region(vc, (unsigned long) p,
b1a925f4 543 vc->vc_cols - vc->vc_x);
1da177e4
LT		 544}
545
546static void delete_char(struct vc_data *vc, unsigned int nr)
547{
81732c3b 548 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 549
b1a925f4 550 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b
JFM		 551 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
552 nr * 2);
1da177e4 553 vc->vc_need_wrap = 0;
81732c3b
JFM		 554 if (DO_UPDATE(vc))
555 do_update_region(vc, (unsigned long) p,
b1a925f4 556 vc->vc_cols - vc->vc_x);
1da177e4
LT		 557}
558
e882f715 559static int softcursor_original = -1;
1da177e4
LT		 560
561static void add_softcursor(struct vc_data *vc)
562{
563 int i = scr_readw((u16 *) vc->vc_pos);
564 u32 type = vc->vc_cursor_type;
565
566 if (! (type & 0x10)) return;
567 if (softcursor_original != -1) return;
568 softcursor_original = i;
569 i |= ((type >> 8) & 0xff00 );
570 i ^= ((type) & 0xff00 );
571 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
572 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
573 scr_writew(i, (u16 *) vc->vc_pos);
574 if (DO_UPDATE(vc))
575 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
576}
577
578static void hide_softcursor(struct vc_data *vc)
579{
580 if (softcursor_original != -1) {
581 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
582 if (DO_UPDATE(vc))
583 vc->vc_sw->con_putc(vc, softcursor_original,
584 vc->vc_y, vc->vc_x);
585 softcursor_original = -1;
586 }
587}
588
589static void hide_cursor(struct vc_data *vc)
590{
591 if (vc == sel_cons)
592 clear_selection();
593 vc->vc_sw->con_cursor(vc, CM_ERASE);
594 hide_softcursor(vc);
595}
596
597static void set_cursor(struct vc_data *vc)
598{
599 if (!IS_FG(vc) || console_blanked ||
600 vc->vc_mode == KD_GRAPHICS)
601 return;
602 if (vc->vc_deccm) {
603 if (vc == sel_cons)
604 clear_selection();
605 add_softcursor(vc);
606 if ((vc->vc_cursor_type & 0x0f) != 1)
607 vc->vc_sw->con_cursor(vc, CM_DRAW);
608 } else
609 hide_cursor(vc);
610}
611
612static void set_origin(struct vc_data *vc)
613{
614 WARN_CONSOLE_UNLOCKED();
615
616 if (!CON_IS_VISIBLE(vc) ||
617 !vc->vc_sw->con_set_origin ||
618 !vc->vc_sw->con_set_origin(vc))
619 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
620 vc->vc_visible_origin = vc->vc_origin;
621 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
622 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
623}
624
c0f160a7 625static void save_screen(struct vc_data *vc)
1da177e4
LT		 626{
627 WARN_CONSOLE_UNLOCKED();
628
629 if (vc->vc_sw->con_save_screen)
630 vc->vc_sw->con_save_screen(vc);
631}
632
633/*
634 * Redrawing of screen
635 */
636
2a248307 637void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 638{
639 unsigned short *p = (unsigned short *)vc->vc_origin;
640 int count = vc->vc_screenbuf_size / 2;
641 int mask = vc->vc_hi_font_mask | 0xff;
642
643 for (; count > 0; count--, p++) {
644 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
645 }
646}
647
648void redraw_screen(struct vc_data *vc, int is_switch)
649{
650 int redraw = 0;
651
652 WARN_CONSOLE_UNLOCKED();
653
654 if (!vc) {
655 /* strange ... */
656 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
657 return;
658 }
659
660 if (is_switch) {
661 struct vc_data *old_vc = vc_cons[fg_console].d;
662 if (old_vc == vc)
663 return;
664 if (!CON_IS_VISIBLE(vc))
665 redraw = 1;
666 *vc->vc_display_fg = vc;
667 fg_console = vc->vc_num;
668 hide_cursor(old_vc);
669 if (!CON_IS_VISIBLE(old_vc)) {
670 save_screen(old_vc);
671 set_origin(old_vc);
672 }
fbc92a34
KS		 673 if (tty0dev)
674 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 675 } else {
676 hide_cursor(vc);
677 redraw = 1;
678 }
679
680 if (redraw) {
681 int update;
682 int old_was_color = vc->vc_can_do_color;
683
684 set_origin(vc);
685 update = vc->vc_sw->con_switch(vc);
686 set_palette(vc);
687 /*
688 * If console changed from mono<->color, the best we can do
689 * is to clear the buffer attributes. As it currently stands,
690 * rebuilding new attributes from the old buffer is not doable
691 * without overly complex code.
692 */
693 if (old_was_color != vc->vc_can_do_color) {
694 update_attr(vc);
695 clear_buffer_attributes(vc);
696 }
8fd4bd22
JB		 697
698 /* Forcibly update if we're panicing */
699 if ((update && vc->vc_mode != KD_GRAPHICS) ||
700 vt_force_oops_output(vc))
1da177e4
LT		 701 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
702 }
703 set_cursor(vc);
704 if (is_switch) {
705 set_leds();
706 compute_shiftstate();
8182ec49 707 notify_update(vc);
1da177e4
LT		 708 }
709}
710
711/*
712 * Allocation, freeing and resizing of VTs.
713 */
714
715int vc_cons_allocated(unsigned int i)
716{
717 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
718}
719
720static void visual_init(struct vc_data *vc, int num, int init)
721{
722 /* ++Geert: vc->vc_sw->con_init determines console size */
723 if (vc->vc_sw)
724 module_put(vc->vc_sw->owner);
725 vc->vc_sw = conswitchp;
726#ifndef VT_SINGLE_DRIVER
727 if (con_driver_map[num])
728 vc->vc_sw = con_driver_map[num];
729#endif
730 __module_get(vc->vc_sw->owner);
731 vc->vc_num = num;
732 vc->vc_display_fg = &master_display_fg;
08b33249
DZ		 733 if (vc->vc_uni_pagedir_loc)
734 con_free_unimap(vc);
1da177e4 735 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
e4bdab70 736 vc->vc_uni_pagedir = NULL;
1da177e4
LT		 737 vc->vc_hi_font_mask = 0;
738 vc->vc_complement_mask = 0;
739 vc->vc_can_do_color = 0;
8fd4bd22 740 vc->vc_panic_force_write = false;
1da177e4
LT		 741 vc->vc_sw->con_init(vc, init);
742 if (!vc->vc_complement_mask)
743 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
744 vc->vc_s_complement_mask = vc->vc_complement_mask;
745 vc->vc_size_row = vc->vc_cols << 1;
746 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
747}
748
749int vc_allocate(unsigned int currcons) /* return 0 on success */
750{
34902b7f
JS		 751 struct vt_notifier_param param;
752 struct vc_data *vc;
753
1da177e4
LT		 754 WARN_CONSOLE_UNLOCKED();
755
756 if (currcons >= MAX_NR_CONSOLES)
757 return -ENXIO;
34902b7f
JS		 758
759 if (vc_cons[currcons].d)
760 return 0;
761
762 /* due to the granularity of kmalloc, we waste some memory here */
763 /* the alloc is done in two steps, to optimize the common situation
764 of a 25x80 console (structsize=216, screenbuf_size=4000) */
765 /* although the numbers above are not valid since long ago, the
766 point is still up-to-date and the comment still has its value
767 even if only as a historical artifact. --mj, July 1998 */
768 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
769 if (!vc)
1da177e4 770 return -ENOMEM;
34902b7f
JS		 771
772 vc_cons[currcons].d = vc;
773 tty_port_init(&vc->port);
774 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
775
776 visual_init(vc, currcons, 1);
777
778 if (!*vc->vc_uni_pagedir_loc)
1da177e4 779 con_set_default_unimap(vc);
f6c06b68 780
34902b7f
JS		 781 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
782 if (!vc->vc_screenbuf)
783 goto err_free;
784
785 /* If no drivers have overridden us and the user didn't pass a
786 boot option, default to displaying the cursor */
787 if (global_cursor_default == -1)
788 global_cursor_default = 1;
789
790 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
791 vcs_make_sysfs(currcons);
792 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
f6c06b68 793
1da177e4 794 return 0;
34902b7f
JS		 795err_free:
796 kfree(vc);
797 vc_cons[currcons].d = NULL;
798 return -ENOMEM;
1da177e4
LT		 799}
800
e400b6ec
AD		 801static inline int resize_screen(struct vc_data *vc, int width, int height,
802 int user)
1da177e4
LT		 803{
804 /* Resizes the resolution of the display adapater */
805 int err = 0;
806
807 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 808 err = vc->vc_sw->con_resize(vc, width, height, user);
809
1da177e4
LT		 810 return err;
811}
812
813/*
814 * Change # of rows and columns (0 means unchanged/the size of fg_console)
815 * [this is to be used together with some user program
816 * like resize that changes the hardware videomode]
817 */
818#define VC_RESIZE_MAXCOL (32767)
819#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 820
821/**
822 * vc_do_resize - resizing method for the tty
823 * @tty: tty being resized
824 * @real_tty: real tty (different to tty if a pty/tty pair)
825 * @vc: virtual console private data
826 * @cols: columns
827 * @lines: lines
828 *
829 * Resize a virtual console, clipping according to the actual constraints.
830 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 831 * information and perform any necessary signal handling.
8c9a9dd0 832 *
6a1c0680 833 * Caller must hold the console semaphore. Takes the termios rwsem and
8c9a9dd0
AC		 834 * ctrl_lock of the tty IFF a tty is passed.
835 */
836
fc6f6238
AC		 837static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
838 unsigned int cols, unsigned int lines)
1da177e4
LT		 839{
840 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 841 unsigned long end;
f2ee4ae8 842 unsigned int old_rows, old_row_size;
1da177e4 843 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 844 unsigned int user;
1da177e4
LT		 845 unsigned short *newscreen;
846
847 WARN_CONSOLE_UNLOCKED();
848
849 if (!vc)
850 return -ENXIO;
851
e400b6ec
AD		 852 user = vc->vc_resize_user;
853 vc->vc_resize_user = 0;
854
1da177e4
LT		 855 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
856 return -EINVAL;
857
858 new_cols = (cols ? cols : vc->vc_cols);
859 new_rows = (lines ? lines : vc->vc_rows);
860 new_row_size = new_cols << 1;
861 new_screen_size = new_row_size * new_rows;
862
863 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
864 return 0;
865
5cbded58 866 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 867 if (!newscreen)
868 return -ENOMEM;
869
870 old_rows = vc->vc_rows;
1da177e4 871 old_row_size = vc->vc_size_row;
1da177e4 872
e400b6ec 873 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 874 if (err) {
875 kfree(newscreen);
876 return err;
877 }
878
879 vc->vc_rows = new_rows;
880 vc->vc_cols = new_cols;
881 vc->vc_size_row = new_row_size;
882 vc->vc_screenbuf_size = new_screen_size;
883
884 rlth = min(old_row_size, new_row_size);
885 rrem = new_row_size - rlth;
886 old_origin = vc->vc_origin;
887 new_origin = (long) newscreen;
888 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 889
890 if (vc->vc_y > new_rows) {
891 if (old_rows - vc->vc_y < new_rows) {
892 /*
893 * Cursor near the bottom, copy contents from the
894 * bottom of buffer
895 */
896 old_origin += (old_rows - new_rows) * old_row_size;
3b41dc1a
AD		 897 } else {
898 /*
899 * Cursor is in no man's land, copy 1/2 screenful
900 * from the top and bottom of cursor position
901 */
902 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
3b41dc1a 903 }
9fc2b2d0
FJ		 904 }
905
906 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4
LT		 907
908 update_attr(vc);
909
3b41dc1a
AD		 910 while (old_origin < end) {
911 scr_memcpyw((unsigned short *) new_origin,
912 (unsigned short *) old_origin, rlth);
1da177e4 913 if (rrem)
3b41dc1a
AD		 914 scr_memsetw((void *)(new_origin + rlth),
915 vc->vc_video_erase_char, rrem);
1da177e4
LT		 916 old_origin += old_row_size;
917 new_origin += new_row_size;
918 }
919 if (new_scr_end > new_origin)
3b41dc1a
AD		 920 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
921 new_scr_end - new_origin);
5c9228f0 922 kfree(vc->vc_screenbuf);
1da177e4 923 vc->vc_screenbuf = newscreen;
1da177e4
LT		 924 vc->vc_screenbuf_size = new_screen_size;
925 set_origin(vc);
926
927 /* do part of a reset_terminal() */
928 vc->vc_top = 0;
929 vc->vc_bottom = vc->vc_rows;
930 gotoxy(vc, vc->vc_x, vc->vc_y);
931 save_cur(vc);
932
8c9a9dd0
AC		 933 if (tty) {
934 /* Rewrite the requested winsize data with the actual
935 resulting sizes */
936 struct winsize ws;
1da177e4
LT		 937 memset(&ws, 0, sizeof(ws));
938 ws.ws_row = vc->vc_rows;
939 ws.ws_col = vc->vc_cols;
940 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 941 tty_do_resize(tty, &ws);
1da177e4
LT		 942 }
943
944 if (CON_IS_VISIBLE(vc))
945 update_screen(vc);
8b92e87d 946 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 947 return err;
948}
949
8c9a9dd0
AC		 950/**
951 * vc_resize - resize a VT
952 * @vc: virtual console
953 * @cols: columns
954 * @rows: rows
955 *
956 * Resize a virtual console as seen from the console end of things. We
957 * use the common vc_do_resize methods to update the structures. The
958 * caller must hold the console sem to protect console internals and
8ce73264 959 * vc->port.tty
8c9a9dd0
AC		 960 */
961
962int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
963{
8ce73264 964 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 965}
966
967/**
968 * vt_resize - resize a VT
969 * @tty: tty to resize
8c9a9dd0
AC		 970 * @ws: winsize attributes
971 *
972 * Resize a virtual terminal. This is called by the tty layer as we
973 * register our own handler for resizing. The mutual helper does all
974 * the actual work.
975 *
976 * Takes the console sem and the called methods then take the tty
6a1c0680 977 * termios_rwsem and the tty ctrl_lock in that order.
8c9a9dd0 978 */
da2bdf9a 979static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 980{
8c9a9dd0
AC		 981 struct vc_data *vc = tty->driver_data;
982 int ret;
ca9bda00 983
ac751efa 984 console_lock();
fc6f6238 985 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 986 console_unlock();
8c9a9dd0 987 return ret;
ca9bda00 988}
1da177e4 989
421b40a6 990struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 991{
421b40a6
PH		 992 struct vc_data *vc = NULL;
993
1da177e4
LT		 994 WARN_CONSOLE_UNLOCKED();
995
996 if (vc_cons_allocated(currcons)) {
421b40a6 997 struct vt_notifier_param param;
4995f8ef 998
421b40a6 999 param.vc = vc = vc_cons[currcons].d;
b293d758 1000 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1001 vcs_remove_sysfs(currcons);
1da177e4 1002 vc->vc_sw->con_deinit(vc);
bde0d2c9 1003 put_pid(vc->vt_pid);
d459ec0b 1004 module_put(vc->vc_sw->owner);
5c9228f0 1005 kfree(vc->vc_screenbuf);
1da177e4
LT		 1006 vc_cons[currcons].d = NULL;
1007 }
421b40a6 1008 return vc;
1da177e4
LT		 1009}
1010
1011/*
1012 * VT102 emulator
1013 */
1014
079c9534
AC		 1015#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1016#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1017#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1018
1019#define decarm VC_REPEAT
1020#define decckm VC_CKMODE
1021#define kbdapplic VC_APPLIC
1022#define lnm VC_CRLF
1023
1024/*
1025 * this is what the terminal answers to a ESC-Z or csi0c query.
1026 */
1027#define VT100ID "\033[?1;2c"
1028#define VT102ID "\033[?6c"
1029
8ede5cce 1030const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1da177e4
LT		 1031 8,12,10,14, 9,13,11,15 };
1032
1033/* the default colour table, for VGA+ colour systems */
91e74ca5
JS		 1034unsigned char default_red[] = {
1035 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1036 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1037};
1038module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1039
1040unsigned char default_grn[] = {
1041 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1042 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1043};
1044module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1045
1046unsigned char default_blu[] = {
1047 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1048 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1049};
1050module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1c2bbe6a 1051
1da177e4
LT		 1052/*
1053 * gotoxy() must verify all boundaries, because the arguments
1054 * might also be negative. If the given position is out of
1055 * bounds, the cursor is placed at the nearest margin.
1056 */
1057static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1058{
1059 int min_y, max_y;
1060
1061 if (new_x < 0)
1062 vc->vc_x = 0;
1063 else {
1064 if (new_x >= vc->vc_cols)
1065 vc->vc_x = vc->vc_cols - 1;
1066 else
1067 vc->vc_x = new_x;
1068 }
1069
1070 if (vc->vc_decom) {
1071 min_y = vc->vc_top;
1072 max_y = vc->vc_bottom;
1073 } else {
1074 min_y = 0;
1075 max_y = vc->vc_rows;
1076 }
1077 if (new_y < min_y)
1078 vc->vc_y = min_y;
1079 else if (new_y >= max_y)
1080 vc->vc_y = max_y - 1;
1081 else
1082 vc->vc_y = new_y;
1083 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1084 vc->vc_need_wrap = 0;
1085}
1086
1087/* for absolute user moves, when decom is set */
1088static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1089{
1090 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1091}
1092
1b0ec88a 1093void scrollback(struct vc_data *vc)
1da177e4 1094{
1b0ec88a 1095 scrolldelta(-(vc->vc_rows / 2));
1da177e4
LT		 1096}
1097
1098void scrollfront(struct vc_data *vc, int lines)
1099{
1100 if (!lines)
1101 lines = vc->vc_rows / 2;
1102 scrolldelta(lines);
1103}
1104
1105static void lf(struct vc_data *vc)
1106{
1107 /* don't scroll if above bottom of scrolling region, or
1108 * if below scrolling region
1109 */
1110 if (vc->vc_y + 1 == vc->vc_bottom)
1111 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1112 else if (vc->vc_y < vc->vc_rows - 1) {
1113 vc->vc_y++;
1114 vc->vc_pos += vc->vc_size_row;
1115 }
1116 vc->vc_need_wrap = 0;
b293d758 1117 notify_write(vc, '\n');
1da177e4
LT		 1118}
1119
1120static void ri(struct vc_data *vc)
1121{
1122 /* don't scroll if below top of scrolling region, or
1123 * if above scrolling region
1124 */
1125 if (vc->vc_y == vc->vc_top)
1126 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1127 else if (vc->vc_y > 0) {
1128 vc->vc_y--;
1129 vc->vc_pos -= vc->vc_size_row;
1130 }
1131 vc->vc_need_wrap = 0;
1132}
1133
1134static inline void cr(struct vc_data *vc)
1135{
1136 vc->vc_pos -= vc->vc_x << 1;
1137 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1138 notify_write(vc, '\r');
1da177e4
LT		 1139}
1140
1141static inline void bs(struct vc_data *vc)
1142{
1143 if (vc->vc_x) {
1144 vc->vc_pos -= 2;
1145 vc->vc_x--;
1146 vc->vc_need_wrap = 0;
b293d758 1147 notify_write(vc, '\b');
1da177e4
LT		 1148 }
1149}
1150
1151static inline void del(struct vc_data *vc)
1152{
1153 /* ignored */
1154}
1155
1156static void csi_J(struct vc_data *vc, int vpar)
1157{
1158 unsigned int count;
1159 unsigned short * start;
1160
1161 switch (vpar) {
1162 case 0: /* erase from cursor to end of display */
1163 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1164 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1165 break;
1166 case 1: /* erase from start to cursor */
1167 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1168 start = (unsigned short *)vc->vc_origin;
1da177e4 1169 break;
f8df13e0
PP		 1170 case 3: /* erase scroll-back buffer (and whole display) */
1171 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1172 vc->vc_screenbuf_size >> 1);
1173 set_origin(vc);
0930b095
PP		 1174 if (CON_IS_VISIBLE(vc))
1175 update_screen(vc);
f8df13e0 1176 /* fall through */
1da177e4
LT		 1177 case 2: /* erase whole display */
1178 count = vc->vc_cols * vc->vc_rows;
1179 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1180 break;
1181 default:
1182 return;
1183 }
1184 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
81732c3b
JFM		 1185 if (DO_UPDATE(vc))
1186 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1187 vc->vc_need_wrap = 0;
1188}
1189
1190static void csi_K(struct vc_data *vc, int vpar)
1191{
1192 unsigned int count;
1193 unsigned short * start;
1194
1195 switch (vpar) {
1196 case 0: /* erase from cursor to end of line */
1197 count = vc->vc_cols - vc->vc_x;
1198 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1199 break;
1200 case 1: /* erase from start of line to cursor */
1201 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1202 count = vc->vc_x + 1;
1da177e4
LT		 1203 break;
1204 case 2: /* erase whole line */
1205 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1206 count = vc->vc_cols;
1da177e4
LT		 1207 break;
1208 default:
1209 return;
1210 }
1211 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1212 vc->vc_need_wrap = 0;
81732c3b
JFM		 1213 if (DO_UPDATE(vc))
1214 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1215}
1216
1217static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1218{ /* not vt100? */
1219 int count;
1220
1221 if (!vpar)
1222 vpar++;
1223 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1224
1225 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1226 if (DO_UPDATE(vc))
1227 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1228 vc->vc_need_wrap = 0;
1229}
1230
1231static void default_attr(struct vc_data *vc)
1232{
1233 vc->vc_intensity = 1;
fa6ce9ab 1234 vc->vc_italic = 0;
1da177e4
LT		 1235 vc->vc_underline = 0;
1236 vc->vc_reverse = 0;
1237 vc->vc_blink = 0;
1238 vc->vc_color = vc->vc_def_color;
1239}
1240
cec5b2a9
AB		 1241struct rgb { u8 r; u8 g; u8 b; };
1242
0f91e142 1243static void rgb_from_256(int i, struct rgb *c)
cec5b2a9 1244{
cec5b2a9 1245 if (i < 8) { /* Standard colours. */
0f91e142
JS		 1246 c->r = i&1 ? 0xaa : 0x00;
1247 c->g = i&2 ? 0xaa : 0x00;
1248 c->b = i&4 ? 0xaa : 0x00;
cec5b2a9 1249 } else if (i < 16) {
0f91e142
JS		 1250 c->r = i&1 ? 0xff : 0x55;
1251 c->g = i&2 ? 0xff : 0x55;
1252 c->b = i&4 ? 0xff : 0x55;
cec5b2a9 1253 } else if (i < 232) { /* 6x6x6 colour cube. */
0f91e142
JS		 1254 c->r = (i - 16) / 36 * 85 / 2;
1255 c->g = (i - 16) / 6 % 6 * 85 / 2;
1256 c->b = (i - 16) % 6 * 85 / 2;
cec5b2a9 1257 } else /* Grayscale ramp. */
0f91e142 1258 c->r = c->g = c->b = i * 10 - 2312;
cec5b2a9
AB		 1259}
1260
0f91e142 1261static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
cec5b2a9 1262{
0f91e142
JS		 1263 u8 hue, max = c->r;
1264 if (c->g > max)
1265 max = c->g;
1266 if (c->b > max)
1267 max = c->b;
1268 hue = (c->r > max/2 ? 4 : 0)
1269 | (c->g > max/2 ? 2 : 0)
1270 | (c->b > max/2 ? 1 : 0);
cec5b2a9
AB		 1271 if (hue == 7 && max <= 0x55)
1272 hue = 0, vc->vc_intensity = 2;
1273 else
1274 vc->vc_intensity = (max > 0xaa) + 1;
1275 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1276}
1277
0f91e142 1278static void rgb_background(struct vc_data *vc, const struct rgb *c)
cec5b2a9
AB		 1279{
1280 /* For backgrounds, err on the dark side. */
1281 vc->vc_color = (vc->vc_color & 0x0f)
0f91e142 1282 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
cec5b2a9
AB		 1283}
1284
e05ab238
JS		 1285/*
1286 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1287 * and thus need to be detected and ignored by hand. Strictly speaking, that
1288 * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1289 * no one produces such codes and almost no one accepts them.
1290 *
1291 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1292 * supporting them.
1293 */
1294static int vc_t416_color(struct vc_data *vc, int i,
0f91e142 1295 void(*set_color)(struct vc_data *vc, const struct rgb *c))
e05ab238 1296{
0f91e142
JS		 1297 struct rgb c;
1298
e05ab238
JS		 1299 i++;
1300 if (i > vc->vc_npar)
1301 return i;
1302
1303 if (vc->vc_par[i] == 5 && i < vc->vc_npar) {
1304 /* 256 colours -- ubiquitous */
1305 i++;
0f91e142 1306 rgb_from_256(vc->vc_par[i], &c);
e05ab238
JS		 1307 } else if (vc->vc_par[i] == 2 && i <= vc->vc_npar + 3) {
1308 /* 24 bit -- extremely rare */
0f91e142
JS		 1309 c.r = vc->vc_par[i + 1];
1310 c.g = vc->vc_par[i + 2];
1311 c.b = vc->vc_par[i + 3];
e05ab238 1312 i += 3;
0f91e142
JS		 1313 } else
1314 return i;
1315
1316 set_color(vc, &c);
e05ab238
JS		 1317
1318 return i;
1319}
1320
ac751efa 1321/* console_lock is held */
1da177e4
LT		 1322static void csi_m(struct vc_data *vc)
1323{
1324 int i;
1325
1326 for (i = 0; i <= vc->vc_npar; i++)
1327 switch (vc->vc_par[i]) {
1328 case 0: /* all attributes off */
1329 default_attr(vc);
1330 break;
1331 case 1:
1332 vc->vc_intensity = 2;
1333 break;
1334 case 2:
1335 vc->vc_intensity = 0;
1336 break;
fa6ce9ab
JE		 1337 case 3:
1338 vc->vc_italic = 1;
1339 break;
1da177e4
LT		 1340 case 4:
1341 vc->vc_underline = 1;
1342 break;
1343 case 5:
1344 vc->vc_blink = 1;
1345 break;
1346 case 7:
1347 vc->vc_reverse = 1;
1348 break;
1349 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1350 * Select primary font, don't display
1351 * control chars if defined, don't set
1352 * bit 8 on output.
1353 */
1354 vc->vc_translate = set_translate(vc->vc_charset == 0
1355 ? vc->vc_G0_charset
1356 : vc->vc_G1_charset, vc);
1357 vc->vc_disp_ctrl = 0;
1358 vc->vc_toggle_meta = 0;
1359 break;
1360 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1361 * Select first alternate font, lets
1362 * chars < 32 be displayed as ROM chars.
1363 */
1364 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1365 vc->vc_disp_ctrl = 1;
1366 vc->vc_toggle_meta = 0;
1367 break;
1368 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1369 * Select second alternate font, toggle
1370 * high bit before displaying as ROM char.
1371 */
1372 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1373 vc->vc_disp_ctrl = 1;
1374 vc->vc_toggle_meta = 1;
1375 break;
1376 case 21:
1377 case 22:
1378 vc->vc_intensity = 1;
1379 break;
fa6ce9ab
JE		 1380 case 23:
1381 vc->vc_italic = 0;
1382 break;
1da177e4
LT		 1383 case 24:
1384 vc->vc_underline = 0;
1385 break;
1386 case 25:
1387 vc->vc_blink = 0;
1388 break;
1389 case 27:
1390 vc->vc_reverse = 0;
1391 break;
e05ab238
JS		 1392 case 38:
1393 i = vc_t416_color(vc, i, rgb_foreground);
3415097f 1394 break;
cec5b2a9 1395 case 48:
e05ab238 1396 i = vc_t416_color(vc, i, rgb_background);
cec5b2a9 1397 break;
64545880 1398 case 39:
1da177e4 1399 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1da177e4
LT		 1400 break;
1401 case 49:
1402 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1403 break;
1404 default:
1405 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1406 vc->vc_color = color_table[vc->vc_par[i] - 30]
1407 | (vc->vc_color & 0xf0);
1408 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1409 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1410 | (vc->vc_color & 0x0f);
1411 break;
1412 }
1413 update_attr(vc);
1414}
1415
6732c8bb 1416static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1417{
1418 while (*p) {
6732c8bb 1419 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1420 p++;
1421 }
6732c8bb 1422 tty_schedule_flip(port);
1da177e4
LT		 1423}
1424
1425static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1426{
1427 char buf[40];
1428
1429 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1430 respond_string(buf, tty->port);
1da177e4
LT		 1431}
1432
1433static inline void status_report(struct tty_struct *tty)
1434{
6732c8bb 1435 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1436}
1437
6732c8bb 1438static inline void respond_ID(struct tty_struct *tty)
1da177e4 1439{
6732c8bb 1440 respond_string(VT102ID, tty->port);
1da177e4
LT		 1441}
1442
1443void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1444{
1445 char buf[8];
1446
1447 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1448 (char)('!' + mry));
6732c8bb 1449 respond_string(buf, tty->port);
1da177e4
LT		 1450}
1451
1452/* invoked via ioctl(TIOCLINUX) and through set_selection */
1453int mouse_reporting(void)
1454{
1455 return vc_cons[fg_console].d->vc_report_mouse;
1456}
1457
ac751efa 1458/* console_lock is held */
1da177e4
LT		 1459static void set_mode(struct vc_data *vc, int on_off)
1460{
1461 int i;
1462
1463 for (i = 0; i <= vc->vc_npar; i++)
1464 if (vc->vc_ques) {
1465 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1466 case 1: /* Cursor keys send ^[Ox/^[[x */
1467 if (on_off)
1468 set_kbd(vc, decckm);
1469 else
1470 clr_kbd(vc, decckm);
1471 break;
1472 case 3: /* 80/132 mode switch unimplemented */
1473 vc->vc_deccolm = on_off;
1474#if 0
1475 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1476 /* this alone does not suffice; some user mode
1477 utility has to change the hardware regs */
1478#endif
1479 break;
1480 case 5: /* Inverted screen on/off */
1481 if (vc->vc_decscnm != on_off) {
1482 vc->vc_decscnm = on_off;
1483 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1484 update_attr(vc);
1485 }
1486 break;
1487 case 6: /* Origin relative/absolute */
1488 vc->vc_decom = on_off;
1489 gotoxay(vc, 0, 0);
1490 break;
1491 case 7: /* Autowrap on/off */
1492 vc->vc_decawm = on_off;
1493 break;
1494 case 8: /* Autorepeat on/off */
1495 if (on_off)
1496 set_kbd(vc, decarm);
1497 else
1498 clr_kbd(vc, decarm);
1499 break;
1500 case 9:
1501 vc->vc_report_mouse = on_off ? 1 : 0;
1502 break;
1503 case 25: /* Cursor on/off */
1504 vc->vc_deccm = on_off;
1505 break;
1506 case 1000:
1507 vc->vc_report_mouse = on_off ? 2 : 0;
1508 break;
1509 }
1510 } else {
1511 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1512 case 3: /* Monitor (display ctrls) */
1513 vc->vc_disp_ctrl = on_off;
1514 break;
1515 case 4: /* Insert Mode on/off */
1516 vc->vc_decim = on_off;
1517 break;
1518 case 20: /* Lf, Enter == CrLf/Lf */
1519 if (on_off)
1520 set_kbd(vc, lnm);
1521 else
1522 clr_kbd(vc, lnm);
1523 break;
1524 }
1525 }
1526}
1527
ac751efa 1528/* console_lock is held */
1da177e4
LT		 1529static void setterm_command(struct vc_data *vc)
1530{
1531 switch(vc->vc_par[0]) {
1532 case 1: /* set color for underline mode */
1533 if (vc->vc_can_do_color &&
1534 vc->vc_par[1] < 16) {
1535 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1536 if (vc->vc_underline)
1537 update_attr(vc);
1538 }
1539 break;
1540 case 2: /* set color for half intensity mode */
1541 if (vc->vc_can_do_color &&
1542 vc->vc_par[1] < 16) {
1543 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1544 if (vc->vc_intensity == 0)
1545 update_attr(vc);
1546 }
1547 break;
1548 case 8: /* store colors as defaults */
1549 vc->vc_def_color = vc->vc_attr;
1550 if (vc->vc_hi_font_mask == 0x100)
1551 vc->vc_def_color >>= 1;
1552 default_attr(vc);
1553 update_attr(vc);
1554 break;
1555 case 9: /* set blanking interval */
f324edc8 1556 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1557 poke_blanked_console();
1558 break;
1559 case 10: /* set bell frequency in Hz */
1560 if (vc->vc_npar >= 1)
1561 vc->vc_bell_pitch = vc->vc_par[1];
1562 else
1563 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1564 break;
1565 case 11: /* set bell duration in msec */
1566 if (vc->vc_npar >= 1)
1567 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
3372ec28 1568 msecs_to_jiffies(vc->vc_par[1]) : 0;
1da177e4
LT		 1569 else
1570 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1571 break;
1572 case 12: /* bring specified console to the front */
1573 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1574 set_console(vc->vc_par[1] - 1);
1575 break;
1576 case 13: /* unblank the screen */
1577 poke_blanked_console();
1578 break;
1579 case 14: /* set vesa powerdown interval */
1580 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1581 break;
1582 case 15: /* activate the previous console */
1583 set_console(last_console);
1584 break;
bd63364c
SD		 1585 case 16: /* set cursor blink duration in msec */
1586 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1587 vc->vc_par[1] <= USHRT_MAX)
1588 vc->vc_cur_blink_ms = vc->vc_par[1];
1589 else
1590 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1591 break;
1da177e4
LT		 1592 }
1593}
1594
ac751efa 1595/* console_lock is held */
1da177e4
LT		 1596static void csi_at(struct vc_data *vc, unsigned int nr)
1597{
1598 if (nr > vc->vc_cols - vc->vc_x)
1599 nr = vc->vc_cols - vc->vc_x;
1600 else if (!nr)
1601 nr = 1;
1602 insert_char(vc, nr);
1603}
1604
ac751efa 1605/* console_lock is held */
1da177e4
LT		 1606static void csi_L(struct vc_data *vc, unsigned int nr)
1607{
1608 if (nr > vc->vc_rows - vc->vc_y)
1609 nr = vc->vc_rows - vc->vc_y;
1610 else if (!nr)
1611 nr = 1;
1612 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1613 vc->vc_need_wrap = 0;
1614}
1615
ac751efa 1616/* console_lock is held */
1da177e4
LT		 1617static void csi_P(struct vc_data *vc, unsigned int nr)
1618{
1619 if (nr > vc->vc_cols - vc->vc_x)
1620 nr = vc->vc_cols - vc->vc_x;
1621 else if (!nr)
1622 nr = 1;
1623 delete_char(vc, nr);
1624}
1625
ac751efa 1626/* console_lock is held */
1da177e4
LT		 1627static void csi_M(struct vc_data *vc, unsigned int nr)
1628{
1629 if (nr > vc->vc_rows - vc->vc_y)
1630 nr = vc->vc_rows - vc->vc_y;
1631 else if (!nr)
1632 nr=1;
1633 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1634 vc->vc_need_wrap = 0;
1635}
1636
ac751efa 1637/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1638static void save_cur(struct vc_data *vc)
1639{
1640 vc->vc_saved_x = vc->vc_x;
1641 vc->vc_saved_y = vc->vc_y;
1642 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1643 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1644 vc->vc_s_underline = vc->vc_underline;
1645 vc->vc_s_blink = vc->vc_blink;
1646 vc->vc_s_reverse = vc->vc_reverse;
1647 vc->vc_s_charset = vc->vc_charset;
1648 vc->vc_s_color = vc->vc_color;
1649 vc->vc_saved_G0 = vc->vc_G0_charset;
1650 vc->vc_saved_G1 = vc->vc_G1_charset;
1651}
1652
ac751efa 1653/* console_lock is held */
1da177e4
LT		 1654static void restore_cur(struct vc_data *vc)
1655{
1656 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1657 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1658 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1659 vc->vc_underline = vc->vc_s_underline;
1660 vc->vc_blink = vc->vc_s_blink;
1661 vc->vc_reverse = vc->vc_s_reverse;
1662 vc->vc_charset = vc->vc_s_charset;
1663 vc->vc_color = vc->vc_s_color;
1664 vc->vc_G0_charset = vc->vc_saved_G0;
1665 vc->vc_G1_charset = vc->vc_saved_G1;
1666 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1667 update_attr(vc);
1668 vc->vc_need_wrap = 0;
1669}
1670
b290af68 1671enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1da177e4 1672 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
63f3a16d 1673 ESpalette, ESosc };
1da177e4 1674
ac751efa 1675/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1676static void reset_terminal(struct vc_data *vc, int do_clear)
1677{
1678 vc->vc_top = 0;
1679 vc->vc_bottom = vc->vc_rows;
1680 vc->vc_state = ESnormal;
1681 vc->vc_ques = 0;
1682 vc->vc_translate = set_translate(LAT1_MAP, vc);
1683 vc->vc_G0_charset = LAT1_MAP;
1684 vc->vc_G1_charset = GRAF_MAP;
1685 vc->vc_charset = 0;
1686 vc->vc_need_wrap = 0;
1687 vc->vc_report_mouse = 0;
042f10ec 1688 vc->vc_utf = default_utf8;
1da177e4
LT		 1689 vc->vc_utf_count = 0;
1690
1691 vc->vc_disp_ctrl = 0;
1692 vc->vc_toggle_meta = 0;
1693
1694 vc->vc_decscnm = 0;
1695 vc->vc_decom = 0;
1696 vc->vc_decawm = 1;
f6c06b68 1697 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1698 vc->vc_decim = 0;
1699
079c9534 1700 vt_reset_keyboard(vc->vc_num);
1da177e4 1701
9ea9a886 1702 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1703 vc->vc_complement_mask = vc->vc_s_complement_mask;
1704
1705 default_attr(vc);
1706 update_attr(vc);
1707
1708 vc->vc_tab_stop[0] = 0x01010100;
1709 vc->vc_tab_stop[1] =
1710 vc->vc_tab_stop[2] =
1711 vc->vc_tab_stop[3] =
a564738c
WK		 1712 vc->vc_tab_stop[4] =
1713 vc->vc_tab_stop[5] =
1714 vc->vc_tab_stop[6] =
1715 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1716
1717 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1718 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 1719 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1720
1721 gotoxy(vc, 0, 0);
1722 save_cur(vc);
1723 if (do_clear)
1724 csi_J(vc, 2);
1725}
1726
ac751efa 1727/* console_lock is held */
1da177e4
LT		 1728static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1729{
1730 /*
1731 * Control characters can be used in the _middle_
1732 * of an escape sequence.
1733 */
63f3a16d
AB		 1734 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1735 return;
1da177e4
LT		 1736 switch (c) {
1737 case 0:
1738 return;
1739 case 7:
63f3a16d
AB		 1740 if (vc->vc_state == ESosc)
1741 vc->vc_state = ESnormal;
1742 else if (vc->vc_bell_duration)
1da177e4
LT		 1743 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1744 return;
1745 case 8:
1746 bs(vc);
1747 return;
1748 case 9:
1749 vc->vc_pos -= (vc->vc_x << 1);
1750 while (vc->vc_x < vc->vc_cols - 1) {
1751 vc->vc_x++;
1752 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1753 break;
1754 }
1755 vc->vc_pos += (vc->vc_x << 1);
b293d758 1756 notify_write(vc, '\t');
1da177e4
LT		 1757 return;
1758 case 10: case 11: case 12:
1759 lf(vc);
1760 if (!is_kbd(vc, lnm))
1761 return;
1762 case 13:
1763 cr(vc);
1764 return;
1765 case 14:
1766 vc->vc_charset = 1;
1767 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1768 vc->vc_disp_ctrl = 1;
1769 return;
1770 case 15:
1771 vc->vc_charset = 0;
1772 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1773 vc->vc_disp_ctrl = 0;
1774 return;
1775 case 24: case 26:
1776 vc->vc_state = ESnormal;
1777 return;
1778 case 27:
1779 vc->vc_state = ESesc;
1780 return;
1781 case 127:
1782 del(vc);
1783 return;
1784 case 128+27:
1785 vc->vc_state = ESsquare;
1786 return;
1787 }
1788 switch(vc->vc_state) {
1789 case ESesc:
1790 vc->vc_state = ESnormal;
1791 switch (c) {
1792 case '[':
1793 vc->vc_state = ESsquare;
1794 return;
1795 case ']':
1796 vc->vc_state = ESnonstd;
1797 return;
1798 case '%':
1799 vc->vc_state = ESpercent;
1800 return;
1801 case 'E':
1802 cr(vc);
1803 lf(vc);
1804 return;
1805 case 'M':
1806 ri(vc);
1807 return;
1808 case 'D':
1809 lf(vc);
1810 return;
1811 case 'H':
1812 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1813 return;
1814 case 'Z':
1815 respond_ID(tty);
1816 return;
1817 case '7':
1818 save_cur(vc);
1819 return;
1820 case '8':
1821 restore_cur(vc);
1822 return;
1823 case '(':
1824 vc->vc_state = ESsetG0;
1825 return;
1826 case ')':
1827 vc->vc_state = ESsetG1;
1828 return;
1829 case '#':
1830 vc->vc_state = EShash;
1831 return;
1832 case 'c':
1833 reset_terminal(vc, 1);
1834 return;
1835 case '>': /* Numeric keypad */
1836 clr_kbd(vc, kbdapplic);
1837 return;
1838 case '=': /* Appl. keypad */
1839 set_kbd(vc, kbdapplic);
1840 return;
1841 }
1842 return;
1843 case ESnonstd:
1844 if (c=='P') { /* palette escape sequence */
1845 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1846 vc->vc_par[vc->vc_npar] = 0;
1847 vc->vc_npar = 0;
1848 vc->vc_state = ESpalette;
1849 return;
1850 } else if (c=='R') { /* reset palette */
1851 reset_palette(vc);
1852 vc->vc_state = ESnormal;
63f3a16d
AB		 1853 } else if (c>='0' && c<='9')
1854 vc->vc_state = ESosc;
1855 else
1da177e4
LT		 1856 vc->vc_state = ESnormal;
1857 return;
1858 case ESpalette:
74c807ce
AS		 1859 if (isxdigit(c)) {
1860 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1861 if (vc->vc_npar == 7) {
1862 int i = vc->vc_par[0] * 3, j = 1;
1863 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1864 vc->vc_palette[i++] += vc->vc_par[j++];
1865 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1866 vc->vc_palette[i++] += vc->vc_par[j++];
1867 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1868 vc->vc_palette[i] += vc->vc_par[j];
1869 set_palette(vc);
1870 vc->vc_state = ESnormal;
1871 }
1872 } else
1873 vc->vc_state = ESnormal;
1874 return;
1875 case ESsquare:
1876 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1877 vc->vc_par[vc->vc_npar] = 0;
1878 vc->vc_npar = 0;
1879 vc->vc_state = ESgetpars;
1880 if (c == '[') { /* Function key */
1881 vc->vc_state=ESfunckey;
1882 return;
1883 }
1884 vc->vc_ques = (c == '?');
1885 if (vc->vc_ques)
1886 return;
1887 case ESgetpars:
1888 if (c == ';' && vc->vc_npar < NPAR - 1) {
1889 vc->vc_npar++;
1890 return;
1891 } else if (c>='0' && c<='9') {
1892 vc->vc_par[vc->vc_npar] *= 10;
1893 vc->vc_par[vc->vc_npar] += c - '0';
1894 return;
b290af68 1895 }
1da177e4
LT		 1896 vc->vc_state = ESnormal;
1897 switch(c) {
1898 case 'h':
1899 set_mode(vc, 1);
1900 return;
1901 case 'l':
1902 set_mode(vc, 0);
1903 return;
1904 case 'c':
1905 if (vc->vc_ques) {
1906 if (vc->vc_par[0])
1907 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1908 else
9ea9a886 1909 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1910 return;
1911 }
1912 break;
1913 case 'm':
1914 if (vc->vc_ques) {
1915 clear_selection();
1916 if (vc->vc_par[0])
1917 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1918 else
1919 vc->vc_complement_mask = vc->vc_s_complement_mask;
1920 return;
1921 }
1922 break;
1923 case 'n':
1924 if (!vc->vc_ques) {
1925 if (vc->vc_par[0] == 5)
1926 status_report(tty);
1927 else if (vc->vc_par[0] == 6)
1928 cursor_report(vc, tty);
1929 }
1930 return;
1931 }
1932 if (vc->vc_ques) {
1933 vc->vc_ques = 0;
1934 return;
1935 }
1936 switch(c) {
1937 case 'G': case '`':
1938 if (vc->vc_par[0])
1939 vc->vc_par[0]--;
1940 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1941 return;
1942 case 'A':
1943 if (!vc->vc_par[0])
1944 vc->vc_par[0]++;
1945 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1946 return;
1947 case 'B': case 'e':
1948 if (!vc->vc_par[0])
1949 vc->vc_par[0]++;
1950 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1951 return;
1952 case 'C': case 'a':
1953 if (!vc->vc_par[0])
1954 vc->vc_par[0]++;
1955 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1956 return;
1957 case 'D':
1958 if (!vc->vc_par[0])
1959 vc->vc_par[0]++;
1960 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1961 return;
1962 case 'E':
1963 if (!vc->vc_par[0])
1964 vc->vc_par[0]++;
1965 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1966 return;
1967 case 'F':
1968 if (!vc->vc_par[0])
1969 vc->vc_par[0]++;
1970 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1971 return;
1972 case 'd':
1973 if (vc->vc_par[0])
1974 vc->vc_par[0]--;
1975 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1976 return;
1977 case 'H': case 'f':
1978 if (vc->vc_par[0])
1979 vc->vc_par[0]--;
1980 if (vc->vc_par[1])
1981 vc->vc_par[1]--;
1982 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1983 return;
1984 case 'J':
1985 csi_J(vc, vc->vc_par[0]);
1986 return;
1987 case 'K':
1988 csi_K(vc, vc->vc_par[0]);
1989 return;
1990 case 'L':
1991 csi_L(vc, vc->vc_par[0]);
1992 return;
1993 case 'M':
1994 csi_M(vc, vc->vc_par[0]);
1995 return;
1996 case 'P':
1997 csi_P(vc, vc->vc_par[0]);
1998 return;
1999 case 'c':
2000 if (!vc->vc_par[0])
2001 respond_ID(tty);
2002 return;
2003 case 'g':
2004 if (!vc->vc_par[0])
2005 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2006 else if (vc->vc_par[0] == 3) {
2007 vc->vc_tab_stop[0] =
2008 vc->vc_tab_stop[1] =
2009 vc->vc_tab_stop[2] =
2010 vc->vc_tab_stop[3] =
a564738c
WK		 2011 vc->vc_tab_stop[4] =
2012 vc->vc_tab_stop[5] =
2013 vc->vc_tab_stop[6] =
2014 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 2015 }
2016 return;
2017 case 'm':
2018 csi_m(vc);
2019 return;
2020 case 'q': /* DECLL - but only 3 leds */
2021 /* map 0,1,2,3 to 0,1,2,4 */
2022 if (vc->vc_par[0] < 4)
079c9534 2023 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2024 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2025 return;
2026 case 'r':
2027 if (!vc->vc_par[0])
2028 vc->vc_par[0]++;
2029 if (!vc->vc_par[1])
2030 vc->vc_par[1] = vc->vc_rows;
2031 /* Minimum allowed region is 2 lines */
2032 if (vc->vc_par[0] < vc->vc_par[1] &&
2033 vc->vc_par[1] <= vc->vc_rows) {
2034 vc->vc_top = vc->vc_par[0] - 1;
2035 vc->vc_bottom = vc->vc_par[1];
2036 gotoxay(vc, 0, 0);
2037 }
2038 return;
2039 case 's':
2040 save_cur(vc);
2041 return;
2042 case 'u':
2043 restore_cur(vc);
2044 return;
2045 case 'X':
2046 csi_X(vc, vc->vc_par[0]);
2047 return;
2048 case '@':
2049 csi_at(vc, vc->vc_par[0]);
2050 return;
2051 case ']': /* setterm functions */
2052 setterm_command(vc);
2053 return;
2054 }
2055 return;
2056 case ESpercent:
2057 vc->vc_state = ESnormal;
2058 switch (c) {
2059 case '@': /* defined in ISO 2022 */
2060 vc->vc_utf = 0;
2061 return;
2062 case 'G': /* prelim official escape code */
2063 case '8': /* retained for compatibility */
2064 vc->vc_utf = 1;
2065 return;
2066 }
2067 return;
2068 case ESfunckey:
2069 vc->vc_state = ESnormal;
2070 return;
2071 case EShash:
2072 vc->vc_state = ESnormal;
2073 if (c == '8') {
2074 /* DEC screen alignment test. kludge :-) */
2075 vc->vc_video_erase_char =
2076 (vc->vc_video_erase_char & 0xff00) | 'E';
2077 csi_J(vc, 2);
2078 vc->vc_video_erase_char =
2079 (vc->vc_video_erase_char & 0xff00) | ' ';
2080 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2081 }
2082 return;
2083 case ESsetG0:
2084 if (c == '0')
2085 vc->vc_G0_charset = GRAF_MAP;
2086 else if (c == 'B')
2087 vc->vc_G0_charset = LAT1_MAP;
2088 else if (c == 'U')
2089 vc->vc_G0_charset = IBMPC_MAP;
2090 else if (c == 'K')
2091 vc->vc_G0_charset = USER_MAP;
2092 if (vc->vc_charset == 0)
2093 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2094 vc->vc_state = ESnormal;
2095 return;
2096 case ESsetG1:
2097 if (c == '0')
2098 vc->vc_G1_charset = GRAF_MAP;
2099 else if (c == 'B')
2100 vc->vc_G1_charset = LAT1_MAP;
2101 else if (c == 'U')
2102 vc->vc_G1_charset = IBMPC_MAP;
2103 else if (c == 'K')
2104 vc->vc_G1_charset = USER_MAP;
2105 if (vc->vc_charset == 1)
2106 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2107 vc->vc_state = ESnormal;
2108 return;
63f3a16d
AB		 2109 case ESosc:
2110 return;
1da177e4
LT		 2111 default:
2112 vc->vc_state = ESnormal;
2113 }
2114}
2115
2f1a2ccb 2116/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2117 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2118 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2119 */
2120struct interval {
2121 uint32_t first;
2122 uint32_t last;
2123};
2124
2125static int bisearch(uint32_t ucs, const struct interval *table, int max)
2126{
2127 int min = 0;
2128 int mid;
2129
2130 if (ucs < table[0].first || ucs > table[max].last)
2131 return 0;
2132 while (max >= min) {
2133 mid = (min + max) / 2;
2134 if (ucs > table[mid].last)
2135 min = mid + 1;
2136 else if (ucs < table[mid].first)
2137 max = mid - 1;
2138 else
2139 return 1;
2140 }
2141 return 0;
2142}
2143
2144static int is_double_width(uint32_t ucs)
2145{
2146 static const struct interval double_width[] = {
2147 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2148 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2149 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2150 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2151 };
0f11541b 2152 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2153}
2154
d711ea8f
JS		 2155static void con_flush(struct vc_data *vc, unsigned long draw_from,
2156 unsigned long draw_to, int *draw_x)
2157{
2158 if (*draw_x < 0)
2159 return;
2160
2161 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2162 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2163 *draw_x = -1;
2164}
2165
ac751efa 2166/* acquires console_lock */
1da177e4
LT		 2167static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2168{
1da177e4
LT		 2169 int c, tc, ok, n = 0, draw_x = -1;
2170 unsigned int currcons;
2171 unsigned long draw_from = 0, draw_to = 0;
2172 struct vc_data *vc;
2f1a2ccb 2173 unsigned char vc_attr;
0341a4d0 2174 struct vt_notifier_param param;
2f1a2ccb
EK		 2175 uint8_t rescan;
2176 uint8_t inverse;
2177 uint8_t width;
1da177e4 2178 u16 himask, charmask;
1da177e4
LT		 2179
2180 if (in_interrupt())
2181 return count;
2182
2183 might_sleep();
2184
ac751efa 2185 console_lock();
1da177e4
LT		 2186 vc = tty->driver_data;
2187 if (vc == NULL) {
2188 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2189 console_unlock();
1da177e4
LT		 2190 return 0;
2191 }
2192
2193 currcons = vc->vc_num;
2194 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2195 /* could this happen? */
2196 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2197 console_unlock();
2198 return 0;
1da177e4 2199 }
1da177e4 2200
1da177e4
LT		 2201 himask = vc->vc_hi_font_mask;
2202 charmask = himask ? 0x1ff : 0xff;
2203
2204 /* undraw cursor first */
2205 if (IS_FG(vc))
2206 hide_cursor(vc);
2207
0341a4d0
KD		 2208 param.vc = vc;
2209
1da177e4
LT		 2210 while (!tty->stopped && count) {
2211 int orig = *buf;
2212 c = orig;
2213 buf++;
2214 n++;
2215 count--;
2f1a2ccb
EK		 2216 rescan = 0;
2217 inverse = 0;
2218 width = 1;
1da177e4
LT		 2219
2220 /* Do no translation at all in control states */
2221 if (vc->vc_state != ESnormal) {
2222 tc = c;
d4328b40 2223 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2224 /* Combine UTF-8 into Unicode in vc_utf_char.
2225 * vc_utf_count is the number of continuation bytes still
2226 * expected to arrive.
2227 * vc_npar is the number of continuation bytes arrived so
2228 * far
2229 */
d4328b40 2230rescan_last_byte:
2f1a2ccb
EK		 2231 if ((c & 0xc0) == 0x80) {
2232 /* Continuation byte received */
2233 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2234 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2235 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2236 vc->vc_npar++;
2237 if (--vc->vc_utf_count) {
2238 /* Still need some bytes */
1da177e4 2239 continue;
2f1a2ccb
EK		 2240 }
2241 /* Got a whole character */
2242 c = vc->vc_utf_char;
2243 /* Reject overlong sequences */
2244 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2245 c > utf8_length_changes[vc->vc_npar])
2246 c = 0xfffd;
2247 } else {
2248 /* Unexpected continuation byte */
2249 vc->vc_utf_count = 0;
2250 c = 0xfffd;
2251 }
1da177e4 2252 } else {
2f1a2ccb
EK		 2253 /* Single ASCII byte or first byte of a sequence received */
2254 if (vc->vc_utf_count) {
2255 /* Continuation byte expected */
2256 rescan = 1;
2257 vc->vc_utf_count = 0;
2258 c = 0xfffd;
2259 } else if (c > 0x7f) {
2260 /* First byte of a multibyte sequence received */
2261 vc->vc_npar = 0;
2262 if ((c & 0xe0) == 0xc0) {
2263 vc->vc_utf_count = 1;
2264 vc->vc_utf_char = (c & 0x1f);
2265 } else if ((c & 0xf0) == 0xe0) {
2266 vc->vc_utf_count = 2;
2267 vc->vc_utf_char = (c & 0x0f);
2268 } else if ((c & 0xf8) == 0xf0) {
2269 vc->vc_utf_count = 3;
2270 vc->vc_utf_char = (c & 0x07);
2271 } else if ((c & 0xfc) == 0xf8) {
2272 vc->vc_utf_count = 4;
2273 vc->vc_utf_char = (c & 0x03);
2274 } else if ((c & 0xfe) == 0xfc) {
2275 vc->vc_utf_count = 5;
2276 vc->vc_utf_char = (c & 0x01);
2277 } else {
2278 /* 254 and 255 are invalid */
2279 c = 0xfffd;
2280 }
2281 if (vc->vc_utf_count) {
2282 /* Still need some bytes */
2283 continue;
2284 }
2285 }
2286 /* Nothing to do if an ASCII byte was received */
1da177e4 2287 }
2f1a2ccb
EK		 2288 /* End of UTF-8 decoding. */
2289 /* c is the received character, or U+FFFD for invalid sequences. */
2290 /* Replace invalid Unicode code points with U+FFFD too */
2291 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2292 c = 0xfffd;
2293 tc = c;
d4328b40 2294 } else { /* no utf or alternate charset mode */
a29ccf6f 2295 tc = vc_translate(vc, c);
1da177e4
LT		 2296 }
2297
0341a4d0
KD		 2298 param.c = tc;
2299 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2300 &param) == NOTIFY_STOP)
2301 continue;
2302
1da177e4
LT		 2303 /* If the original code was a control character we
2304 * only allow a glyph to be displayed if the code is
2305 * not normally used (such as for cursor movement) or
2306 * if the disp_ctrl mode has been explicitly enabled.
2307 * Certain characters (as given by the CTRL_ALWAYS
2308 * bitmap) are always displayed as control characters,
2309 * as the console would be pretty useless without
2310 * them; to display an arbitrary font position use the
2311 * direct-to-font zone in UTF-8 mode.
2312 */
2313 ok = tc && (c >= 32 ||
d4328b40
AT		 2314 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2315 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2316 && (c != 127 || vc->vc_disp_ctrl)
2317 && (c != 128+27);
2318
2319 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2320 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2321 if (is_double_width(c))
2322 width = 2;
2323 }
1da177e4
LT		 2324 /* Now try to find out how to display it */
2325 tc = conv_uni_to_pc(vc, tc);
d4328b40 2326 if (tc & ~charmask) {
2f1a2ccb
EK		 2327 if (tc == -1 || tc == -2) {
2328 continue; /* nothing to display */
2329 }
2330 /* Glyph not found */
c0b79882 2331 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2332 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2333 This would make absolutely no sense with Unicode in mind,
2334 but do this for ASCII characters since a font may lack
2335 Unicode mapping info and we don't want to end up with
2336 having question marks only. */
2f1a2ccb
EK		 2337 tc = c;
2338 } else {
2339 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2340 tc = conv_uni_to_pc(vc, 0xfffd);
2341 if (tc < 0) {
2342 inverse = 1;
2343 tc = conv_uni_to_pc(vc, '?');
2344 if (tc < 0) tc = '?';
2345 }
2346 }
d4328b40 2347 }
1da177e4 2348
2f1a2ccb
EK		 2349 if (!inverse) {
2350 vc_attr = vc->vc_attr;
1da177e4 2351 } else {
2f1a2ccb
EK		 2352 /* invert vc_attr */
2353 if (!vc->vc_can_do_color) {
2354 vc_attr = (vc->vc_attr) ^ 0x08;
2355 } else if (vc->vc_hi_font_mask == 0x100) {
2356 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2357 } else {
2358 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2359 }
d711ea8f 2360 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4 2361 }
2f1a2ccb
EK		 2362
2363 while (1) {
2364 if (vc->vc_need_wrap || vc->vc_decim)
d711ea8f
JS		 2365 con_flush(vc, draw_from, draw_to,
2366 &draw_x);
2f1a2ccb
EK		 2367 if (vc->vc_need_wrap) {
2368 cr(vc);
2369 lf(vc);
2370 }
2371 if (vc->vc_decim)
2372 insert_char(vc, 1);
2373 scr_writew(himask ?
2374 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2375 (vc_attr << 8) + tc,
2376 (u16 *) vc->vc_pos);
2377 if (DO_UPDATE(vc) && draw_x < 0) {
2378 draw_x = vc->vc_x;
2379 draw_from = vc->vc_pos;
2380 }
2381 if (vc->vc_x == vc->vc_cols - 1) {
2382 vc->vc_need_wrap = vc->vc_decawm;
2383 draw_to = vc->vc_pos + 2;
2384 } else {
2385 vc->vc_x++;
2386 draw_to = (vc->vc_pos += 2);
d4328b40 2387 }
2f1a2ccb
EK		 2388
2389 if (!--width) break;
2390
2391 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2392 if (tc < 0) tc = ' ';
2393 }
b293d758 2394 notify_write(vc, c);
2f1a2ccb 2395
d711ea8f
JS		 2396 if (inverse)
2397 con_flush(vc, draw_from, draw_to, &draw_x);
1ed8a2b3 2398
2f1a2ccb
EK		 2399 if (rescan) {
2400 rescan = 0;
2401 inverse = 0;
2402 width = 1;
d4328b40
AT		 2403 c = orig;
2404 goto rescan_last_byte;
2405 }
1da177e4
LT		 2406 continue;
2407 }
d711ea8f 2408 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4
LT		 2409 do_con_trol(tty, vc, orig);
2410 }
d711ea8f 2411 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4 2412 console_conditional_schedule();
ac751efa 2413 console_unlock();
b293d758 2414 notify_update(vc);
1da177e4 2415 return n;
1da177e4
LT		 2416}
2417
2418/*
2419 * This is the console switching callback.
2420 *
2421 * Doing console switching in a process context allows
2422 * us to do the switches asynchronously (needed when we want
2423 * to switch due to a keyboard interrupt). Synchronization
2424 * with other console code and prevention of re-entrancy is
ac751efa 2425 * ensured with console_lock.
1da177e4 2426 */
65f27f38 2427static void console_callback(struct work_struct *ignored)
1da177e4 2428{
ac751efa 2429 console_lock();
1da177e4
LT		 2430
2431 if (want_console >= 0) {
2432 if (want_console != fg_console &&
2433 vc_cons_allocated(want_console)) {
2434 hide_cursor(vc_cons[fg_console].d);
2435 change_console(vc_cons[want_console].d);
2436 /* we only changed when the console had already
2437 been allocated - a new console is not created
2438 in an interrupt routine */
2439 }
2440 want_console = -1;
2441 }
2442 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2443 do_poke_blanked_console = 0;
2444 poke_blanked_console();
2445 }
2446 if (scrollback_delta) {
2447 struct vc_data *vc = vc_cons[fg_console].d;
2448 clear_selection();
97293de9 2449 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
1da177e4
LT		 2450 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2451 scrollback_delta = 0;
2452 }
2453 if (blank_timer_expired) {
2454 do_blank_screen(0);
2455 blank_timer_expired = 0;
2456 }
b293d758 2457 notify_update(vc_cons[fg_console].d);
1da177e4 2458
ac751efa 2459 console_unlock();
1da177e4
LT		 2460}
2461
b257bc05 2462int set_console(int nr)
1da177e4 2463{
b257bc05
AJ		 2464 struct vc_data *vc = vc_cons[fg_console].d;
2465
2466 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2467 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2468
2469 /*
2470 * Console switch will fail in console_callback() or
2471 * change_console() so there is no point scheduling
2472 * the callback
2473 *
2474 * Existing set_console() users don't check the return
2475 * value so this shouldn't break anything
2476 */
2477 return -EINVAL;
2478 }
2479
1da177e4
LT		 2480 want_console = nr;
2481 schedule_console_callback();
b257bc05
AJ		 2482
2483 return 0;
1da177e4
LT		 2484}
2485
2486struct tty_driver *console_driver;
2487
2488#ifdef CONFIG_VT_CONSOLE
2489
5ada918b
BW		 2490/**
2491 * vt_kmsg_redirect() - Sets/gets the kernel message console
2492 * @new: The new virtual terminal number or -1 if the console should stay
2493 * unchanged
2494 *
2495 * By default, the kernel messages are always printed on the current virtual
2496 * console. However, the user may modify that default with the
2497 * TIOCL_SETKMSGREDIRECT ioctl call.
2498 *
2499 * This function sets the kernel message console to be @new. It returns the old
2500 * virtual console number. The virtual terminal number 0 (both as parameter and
2501 * return value) means no redirection (i.e. always printed on the currently
2502 * active console).
2503 *
2504 * The parameter -1 means that only the current console is returned, but the
2505 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2506 * case to make the code more understandable.
2507 *
2508 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2509 * the parameter and always returns 0.
2510 */
2511int vt_kmsg_redirect(int new)
2512{
2513 static int kmsg_con;
2514
2515 if (new != -1)
2516 return xchg(&kmsg_con, new);
2517 else
2518 return kmsg_con;
2519}
2520
1da177e4
LT		 2521/*
2522 * Console on virtual terminal
2523 *
2524 * The console must be locked when we get here.
2525 */
2526
2527static void vt_console_print(struct console *co, const char *b, unsigned count)
2528{
2529 struct vc_data *vc = vc_cons[fg_console].d;
2530 unsigned char c;
b0940003 2531 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2532 const ushort *start;
2533 ushort cnt = 0;
2534 ushort myx;
5ada918b 2535 int kmsg_console;
1da177e4
LT		 2536
2537 /* console busy or not yet initialized */
b0940003
NP		 2538 if (!printable)
2539 return;
2540 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2541 return;
2542
5ada918b
BW		 2543 kmsg_console = vt_get_kmsg_redirect();
2544 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2545 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2546
2547 /* read `x' only after setting currcons properly (otherwise
2548 the `x' macro will read the x of the foreground console). */
2549 myx = vc->vc_x;
2550
2551 if (!vc_cons_allocated(fg_console)) {
2552 /* impossible */
2553 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2554 goto quit;
2555 }
2556
8fd4bd22 2557 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2558 goto quit;
2559
2560 /* undraw cursor first */
2561 if (IS_FG(vc))
2562 hide_cursor(vc);
2563
2564 start = (ushort *)vc->vc_pos;
2565
2566 /* Contrived structure to try to emulate original need_wrap behaviour
2567 * Problems caused when we have need_wrap set on '\n' character */
2568 while (count--) {
2569 c = *b++;
2570 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2571 if (cnt > 0) {
2572 if (CON_IS_VISIBLE(vc))
2573 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2574 vc->vc_x += cnt;
2575 if (vc->vc_need_wrap)
2576 vc->vc_x--;
2577 cnt = 0;
2578 }
2579 if (c == 8) { /* backspace */
2580 bs(vc);
2581 start = (ushort *)vc->vc_pos;
2582 myx = vc->vc_x;
2583 continue;
2584 }
2585 if (c != 13)
2586 lf(vc);
2587 cr(vc);
2588 start = (ushort *)vc->vc_pos;
2589 myx = vc->vc_x;
2590 if (c == 10 || c == 13)
2591 continue;
2592 }
2593 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2594 notify_write(vc, c);
1da177e4
LT		 2595 cnt++;
2596 if (myx == vc->vc_cols - 1) {
2597 vc->vc_need_wrap = 1;
2598 continue;
2599 }
2600 vc->vc_pos += 2;
2601 myx++;
2602 }
2603 if (cnt > 0) {
2604 if (CON_IS_VISIBLE(vc))
2605 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2606 vc->vc_x += cnt;
2607 if (vc->vc_x == vc->vc_cols) {
2608 vc->vc_x--;
2609 vc->vc_need_wrap = 1;
2610 }
2611 }
2612 set_cursor(vc);
b293d758 2613 notify_update(vc);
1da177e4
LT		 2614
2615quit:
b0940003 2616 spin_unlock(&printing_lock);
1da177e4
LT		 2617}
2618
2619static struct tty_driver *vt_console_device(struct console *c, int *index)
2620{
2621 *index = c->index ? c->index-1 : fg_console;
2622 return console_driver;
2623}
2624
2625static struct console vt_console_driver = {
2626 .name = "tty",
2627 .write = vt_console_print,
2628 .device = vt_console_device,
2629 .unblank = unblank_screen,
2630 .flags = CON_PRINTBUFFER,
2631 .index = -1,
2632};
2633#endif
2634
2635/*
2636 * Handling of Linux-specific VC ioctls
2637 */
2638
2639/*
ac751efa 2640 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2641 *
2642 * There are some functions which don't need it.
2643 *
2644 * There are some functions which can sleep for arbitrary periods
2645 * (paste_selection) but we don't need the lock there anyway.
2646 *
2647 * set_selection has locking, and definitely needs it
2648 */
2649
2650int tioclinux(struct tty_struct *tty, unsigned long arg)
2651{
2652 char type, data;
2653 char __user *p = (char __user *)arg;
2654 int lines;
2655 int ret;
2656
1da177e4
LT		 2657 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2658 return -EPERM;
2659 if (get_user(type, p))
2660 return -EFAULT;
2661 ret = 0;
04f378b1 2662
1da177e4
LT		 2663 switch (type)
2664 {
2665 case TIOCL_SETSEL:
ac751efa 2666 console_lock();
1da177e4 2667 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2668 console_unlock();
1da177e4
LT		 2669 break;
2670 case TIOCL_PASTESEL:
2671 ret = paste_selection(tty);
2672 break;
2673 case TIOCL_UNBLANKSCREEN:
ac751efa 2674 console_lock();
1da177e4 2675 unblank_screen();
ac751efa 2676 console_unlock();
1da177e4
LT		 2677 break;
2678 case TIOCL_SELLOADLUT:
5289475d 2679 console_lock();
1da177e4 2680 ret = sel_loadlut(p);
5289475d 2681 console_unlock();
1da177e4
LT		 2682 break;
2683 case TIOCL_GETSHIFTSTATE:
04f378b1 2684
1da177e4
LT		 2685 /*
2686 * Make it possible to react to Shift+Mousebutton.
2687 * Note that 'shift_state' is an undocumented
2688 * kernel-internal variable; programs not closely
2689 * related to the kernel should not use this.
2690 */
079c9534 2691 data = vt_get_shift_state();
1da177e4
LT		 2692 ret = __put_user(data, p);
2693 break;
2694 case TIOCL_GETMOUSEREPORTING:
20f62579 2695 console_lock(); /* May be overkill */
1da177e4 2696 data = mouse_reporting();
20f62579 2697 console_unlock();
1da177e4
LT		 2698 ret = __put_user(data, p);
2699 break;
2700 case TIOCL_SETVESABLANK:
20f62579 2701 console_lock();
403aac96 2702 ret = set_vesa_blanking(p);
20f62579 2703 console_unlock();
1da177e4 2704 break;
0ca07731 2705 case TIOCL_GETKMSGREDIRECT:
5ada918b 2706 data = vt_get_kmsg_redirect();
0ca07731
RW		 2707 ret = __put_user(data, p);
2708 break;
1da177e4
LT		 2709 case TIOCL_SETKMSGREDIRECT:
2710 if (!capable(CAP_SYS_ADMIN)) {
2711 ret = -EPERM;
2712 } else {
2713 if (get_user(data, p+1))
2714 ret = -EFAULT;
2715 else
5ada918b 2716 vt_kmsg_redirect(data);
1da177e4
LT		 2717 }
2718 break;
2719 case TIOCL_GETFGCONSOLE:
20f62579
AC		 2720 /* No locking needed as this is a transiently
2721 correct return anyway if the caller hasn't
2722 disabled switching */
1da177e4
LT		 2723 ret = fg_console;
2724 break;
2725 case TIOCL_SCROLLCONSOLE:
2726 if (get_user(lines, (s32 __user *)(p+4))) {
2727 ret = -EFAULT;
2728 } else {
20f62579
AC		 2729 /* Need the console lock here. Note that lots
2730 of other calls need fixing before the lock
2731 is actually useful ! */
2732 console_lock();
1da177e4 2733 scrollfront(vc_cons[fg_console].d, lines);
20f62579 2734 console_unlock();
1da177e4
LT		 2735 ret = 0;
2736 }
2737 break;
2738 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2739 console_lock();
1da177e4
LT		 2740 ignore_poke = 1;
2741 do_blank_screen(0);
ac751efa 2742 console_unlock();
1da177e4
LT		 2743 break;
2744 case TIOCL_BLANKEDSCREEN:
2745 ret = console_blanked;
2746 break;
2747 default:
2748 ret = -EINVAL;
2749 break;
2750 }
2751 return ret;
2752}
2753
2754/*
2755 * /dev/ttyN handling
2756 */
2757
2758static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2759{
2760 int retval;
2761
2762 retval = do_con_write(tty, buf, count);
2763 con_flush_chars(tty);
2764
2765 return retval;
2766}
2767
5d19f546 2768static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2769{
2770 if (in_interrupt())
5d19f546
AC		 2771 return 0; /* n_r3964 calls put_char() from interrupt context */
2772 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2773}
2774
2775static int con_write_room(struct tty_struct *tty)
2776{
2777 if (tty->stopped)
2778 return 0;
a88a69c9 2779 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2780}
2781
2782static int con_chars_in_buffer(struct tty_struct *tty)
2783{
2784 return 0; /* we're not buffering */
2785}
2786
2787/*
2788 * con_throttle and con_unthrottle are only used for
2789 * paste_selection(), which has to stuff in a large number of
2790 * characters...
2791 */
2792static void con_throttle(struct tty_struct *tty)
2793{
2794}
2795
2796static void con_unthrottle(struct tty_struct *tty)
2797{
2798 struct vc_data *vc = tty->driver_data;
2799
2800 wake_up_interruptible(&vc->paste_wait);
2801}
2802
2803/*
2804 * Turn the Scroll-Lock LED on when the tty is stopped
2805 */
2806static void con_stop(struct tty_struct *tty)
2807{
2808 int console_num;
2809 if (!tty)
2810 return;
2811 console_num = tty->index;
2812 if (!vc_cons_allocated(console_num))
2813 return;
079c9534 2814 vt_kbd_con_stop(console_num);
1da177e4
LT		 2815}
2816
2817/*
2818 * Turn the Scroll-Lock LED off when the console is started
2819 */
2820static void con_start(struct tty_struct *tty)
2821{
2822 int console_num;
2823 if (!tty)
2824 return;
2825 console_num = tty->index;
2826 if (!vc_cons_allocated(console_num))
2827 return;
079c9534 2828 vt_kbd_con_start(console_num);
1da177e4
LT		 2829}
2830
2831static void con_flush_chars(struct tty_struct *tty)
2832{
2833 struct vc_data *vc;
2834
2835 if (in_interrupt()) /* from flush_to_ldisc */
2836 return;
2837
2838 /* if we race with con_close(), vt may be null */
ac751efa 2839 console_lock();
1da177e4
LT		 2840 vc = tty->driver_data;
2841 if (vc)
2842 set_cursor(vc);
ac751efa 2843 console_unlock();
1da177e4
LT		 2844}
2845
2846/*
2847 * Allocate the console screen memory.
2848 */
bc1e99d9 2849static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 2850{
2851 unsigned int currcons = tty->index;
bc1e99d9
JS		 2852 struct vc_data *vc;
2853 int ret;
1da177e4 2854
ac751efa 2855 console_lock();
bc1e99d9
JS		 2856 ret = vc_allocate(currcons);
2857 if (ret)
2858 goto unlock;
feebed65 2859
bc1e99d9 2860 vc = vc_cons[currcons].d;
1da177e4 2861
bc1e99d9
JS		 2862 /* Still being freed */
2863 if (vc->port.tty) {
2864 ret = -ERESTARTSYS;
2865 goto unlock;
2866 }
2867
2868 ret = tty_port_install(&vc->port, driver, tty);
2869 if (ret)
2870 goto unlock;
2871
2872 tty->driver_data = vc;
2873 vc->port.tty = tty;
2874
2875 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2876 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2877 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 2878 }
bc1e99d9 2879 if (vc->vc_utf)
adc8d746 2880 tty->termios.c_iflag |= IUTF8;
bc1e99d9 2881 else
adc8d746 2882 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 2883unlock:
ac751efa 2884 console_unlock();
1da177e4
LT		 2885 return ret;
2886}
2887
bc1e99d9
JS		 2888static int con_open(struct tty_struct *tty, struct file *filp)
2889{
2890 /* everything done in install */
2891 return 0;
2892}
2893
2894
1da177e4
LT		 2895static void con_close(struct tty_struct *tty, struct file *filp)
2896{
feebed65
AC		 2897 /* Nothing to do - we defer to shutdown */
2898}
1da177e4 2899
feebed65
AC		 2900static void con_shutdown(struct tty_struct *tty)
2901{
2902 struct vc_data *vc = tty->driver_data;
2903 BUG_ON(vc == NULL);
ac751efa 2904 console_lock();
8ce73264 2905 vc->port.tty = NULL;
ac751efa 2906 console_unlock();
1da177e4
LT		 2907}
2908
3855ae1c 2909static int default_color = 7; /* white */
fa6ce9ab
JE		 2910static int default_italic_color = 2; // green (ASCII)
2911static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 2912module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 2913module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2914module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2915
1da177e4
LT		 2916static void vc_init(struct vc_data *vc, unsigned int rows,
2917 unsigned int cols, int do_clear)
2918{
2919 int j, k ;
2920
2921 vc->vc_cols = cols;
2922 vc->vc_rows = rows;
2923 vc->vc_size_row = cols << 1;
2924 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2925
2926 set_origin(vc);
2927 vc->vc_pos = vc->vc_origin;
2928 reset_vc(vc);
2929 for (j=k=0; j<16; j++) {
2930 vc->vc_palette[k++] = default_red[j] ;
2931 vc->vc_palette[k++] = default_grn[j] ;
2932 vc->vc_palette[k++] = default_blu[j] ;
2933 }
3855ae1c 2934 vc->vc_def_color = default_color;
fa6ce9ab
JE		 2935 vc->vc_ulcolor = default_underline_color;
2936 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2937 vc->vc_halfcolor = 0x08; /* grey */
2938 init_waitqueue_head(&vc->paste_wait);
2939 reset_terminal(vc, do_clear);
2940}
2941
2942/*
2943 * This routine initializes console interrupts, and does nothing
2944 * else. If you want the screen to clear, call tty_write with
2945 * the appropriate escape-sequence.
2946 */
2947
2948static int __init con_init(void)
2949{
2950 const char *display_desc = NULL;
2951 struct vc_data *vc;
3e795de7 2952 unsigned int currcons = 0, i;
1da177e4 2953
ac751efa 2954 console_lock();
1da177e4
LT		 2955
2956 if (conswitchp)
2957 display_desc = conswitchp->con_startup();
2958 if (!display_desc) {
2959 fg_console = 0;
ac751efa 2960 console_unlock();
1da177e4
LT		 2961 return 0;
2962 }
2963
3e795de7
AD		 2964 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2965 struct con_driver *con_driver = &registered_con_driver[i];
2966
2967 if (con_driver->con == NULL) {
2968 con_driver->con = conswitchp;
2969 con_driver->desc = display_desc;
2970 con_driver->flag = CON_DRIVER_FLAG_INIT;
2971 con_driver->first = 0;
2972 con_driver->last = MAX_NR_CONSOLES - 1;
2973 break;
2974 }
2975 }
2976
2977 for (i = 0; i < MAX_NR_CONSOLES; i++)
2978 con_driver_map[i] = conswitchp;
2979
1da177e4
LT		 2980 if (blankinterval) {
2981 blank_state = blank_normal_wait;
f324edc8 2982 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2983 }
2984
1da177e4 2985 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2986 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2987 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 2988 tty_port_init(&vc->port);
1da177e4 2989 visual_init(vc, currcons, 1);
a5f4f52e 2990 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 2991 vc_init(vc, vc->vc_rows, vc->vc_cols,
2992 currcons || !vc->vc_sw->con_save_screen);
2993 }
2994 currcons = fg_console = 0;
2995 master_display_fg = vc = vc_cons[currcons].d;
2996 set_origin(vc);
2997 save_screen(vc);
2998 gotoxy(vc, vc->vc_x, vc->vc_y);
2999 csi_J(vc, 0);
3000 update_screen(vc);
5da527aa 3001 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3002 vc->vc_can_do_color ? "colour" : "mono",
3003 display_desc, vc->vc_cols, vc->vc_rows);
3004 printable = 1;
1da177e4 3005
ac751efa 3006 console_unlock();
1da177e4
LT		 3007
3008#ifdef CONFIG_VT_CONSOLE
3009 register_console(&vt_console_driver);
3010#endif
3011 return 0;
3012}
3013console_initcall(con_init);
3014
b68e31d0 3015static const struct tty_operations con_ops = {
bc1e99d9 3016 .install = con_install,
1da177e4
LT		 3017 .open = con_open,
3018 .close = con_close,
3019 .write = con_write,
3020 .write_room = con_write_room,
3021 .put_char = con_put_char,
3022 .flush_chars = con_flush_chars,
3023 .chars_in_buffer = con_chars_in_buffer,
3024 .ioctl = vt_ioctl,
e9216651
AB		 3025#ifdef CONFIG_COMPAT
3026 .compat_ioctl = vt_compat_ioctl,
3027#endif
1da177e4
LT		 3028 .stop = con_stop,
3029 .start = con_start,
3030 .throttle = con_throttle,
3031 .unthrottle = con_unthrottle,
8c9a9dd0 3032 .resize = vt_resize,
feebed65 3033 .shutdown = con_shutdown
1da177e4
LT		 3034};
3035
d81ed103
AC		 3036static struct cdev vc0_cdev;
3037
fbc92a34
KS		 3038static ssize_t show_tty_active(struct device *dev,
3039 struct device_attribute *attr, char *buf)
3040{
3041 return sprintf(buf, "tty%d\n", fg_console + 1);
3042}
3043static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3044
1083a7be
TI		 3045static struct attribute *vt_dev_attrs[] = {
3046 &dev_attr_active.attr,
3047 NULL
3048};
3049
3050ATTRIBUTE_GROUPS(vt_dev);
3051
d81ed103 3052int __init vty_init(const struct file_operations *console_fops)
1da177e4 3053{
d81ed103
AC		 3054 cdev_init(&vc0_cdev, console_fops);
3055 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3056 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3057 panic("Couldn't register /dev/tty0 driver\n");
1083a7be
TI		 3058 tty0dev = device_create_with_groups(tty_class, NULL,
3059 MKDEV(TTY_MAJOR, 0), NULL,
3060 vt_dev_groups, "tty0");
fbc92a34
KS		 3061 if (IS_ERR(tty0dev))
3062 tty0dev = NULL;
d81ed103 3063
1da177e4
LT		 3064 vcs_init();
3065
3066 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3067 if (!console_driver)
3068 panic("Couldn't allocate console driver\n");
2f16669d 3069
1da177e4
LT		 3070 console_driver->name = "tty";
3071 console_driver->name_base = 1;
3072 console_driver->major = TTY_MAJOR;
3073 console_driver->minor_start = 1;
3074 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3075 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3076 if (default_utf8)
3077 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3078 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3079 tty_set_operations(console_driver, &con_ops);
3080 if (tty_register_driver(console_driver))
3081 panic("Couldn't register console driver\n");
1da177e4
LT		 3082 kbd_init();
3083 console_map_init();
1da177e4
LT		 3084#ifdef CONFIG_MDA_CONSOLE
3085 mda_console_init();
3086#endif
3087 return 0;
3088}
3089
3090#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3091
3092static struct class *vtconsole_class;
3093
50e244cc 3094static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3095 int deflt)
1da177e4 3096{
3e795de7
AD		 3097 struct module *owner = csw->owner;
3098 const char *desc = NULL;
3099 struct con_driver *con_driver;
3100 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3101
1da177e4
LT		 3102 if (!try_module_get(owner))
3103 return -ENODEV;
3104
50e244cc 3105 WARN_CONSOLE_UNLOCKED();
1c8ce271 3106
3e795de7
AD		 3107 /* check if driver is registered */
3108 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3109 con_driver = &registered_con_driver[i];
3110
3111 if (con_driver->con == csw) {
3112 desc = con_driver->desc;
3113 retval = 0;
3114 break;
3115 }
3116 }
3117
3118 if (retval)
3119 goto err;
3120
3121 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3122 csw->con_startup();
3123 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3124 }
1c8ce271 3125
1da177e4
LT		 3126 if (deflt) {
3127 if (conswitchp)
3128 module_put(conswitchp->owner);
1c8ce271 3129
1da177e4
LT		 3130 __module_get(owner);
3131 conswitchp = csw;
3132 }
3133
3e795de7
AD		 3134 first = max(first, con_driver->first);
3135 last = min(last, con_driver->last);
3136
1da177e4
LT		 3137 for (i = first; i <= last; i++) {
3138 int old_was_color;
3139 struct vc_data *vc = vc_cons[i].d;
3140
3141 if (con_driver_map[i])
3142 module_put(con_driver_map[i]->owner);
3143 __module_get(owner);
3144 con_driver_map[i] = csw;
3145
3146 if (!vc || !vc->vc_sw)
3147 continue;
3148
3149 j = i;
1c8ce271 3150
4ee1acce
DH		 3151 if (CON_IS_VISIBLE(vc)) {
3152 k = i;
1da177e4 3153 save_screen(vc);
4ee1acce
DH		 3154 }
3155
1da177e4
LT		 3156 old_was_color = vc->vc_can_do_color;
3157 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3158 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3159 visual_init(vc, i, 0);
1c8ce271 3160 set_origin(vc);
1da177e4
LT		 3161 update_attr(vc);
3162
3163 /* If the console changed between mono <-> color, then
3164 * the attributes in the screenbuf will be wrong. The
3165 * following resets all attributes to something sane.
3166 */
3167 if (old_was_color != vc->vc_can_do_color)
3168 clear_buffer_attributes(vc);
1da177e4 3169 }
4ee1acce 3170
1ffdda95 3171 pr_info("Console: switching ");
1da177e4
LT		 3172 if (!deflt)
3173 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3174 if (j >= 0) {
3175 struct vc_data *vc = vc_cons[j].d;
3176
1da177e4 3177 printk("to %s %s %dx%d\n",
4ee1acce
DH		 3178 vc->vc_can_do_color ? "colour" : "mono",
3179 desc, vc->vc_cols, vc->vc_rows);
3180
3181 if (k >= 0) {
3182 vc = vc_cons[k].d;
3183 update_screen(vc);
3184 }
3185 } else
1da177e4
LT		 3186 printk("to %s\n", desc);
3187
3e795de7
AD		 3188 retval = 0;
3189err:
1da177e4 3190 module_put(owner);
3e795de7
AD		 3191 return retval;
3192};
1da177e4 3193
50e244cc 3194
13ae6645 3195#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86
TI		 3196/* unlocked version of unbind_con_driver() */
3197int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3198{
3e795de7
AD		 3199 struct module *owner = csw->owner;
3200 const struct consw *defcsw = NULL;
3201 struct con_driver *con_driver = NULL, *con_back = NULL;
3202 int i, retval = -ENODEV;
1da177e4 3203
3e795de7
AD		 3204 if (!try_module_get(owner))
3205 return -ENODEV;
3206
e93a9a86 3207 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3208
3209 /* check if driver is registered and if it is unbindable */
3210 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3211 con_driver = &registered_con_driver[i];
3212
3213 if (con_driver->con == csw &&
6db4063c 3214 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3215 retval = 0;
3216 break;
3217 }
3218 }
3219
e93a9a86 3220 if (retval)
3e795de7 3221 goto err;
3e795de7 3222
6db4063c
AD		 3223 retval = -ENODEV;
3224
3e795de7
AD		 3225 /* check if backup driver exists */
3226 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3227 con_back = &registered_con_driver[i];
3228
249f7b3e 3229 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3230 defcsw = con_back->con;
3231 retval = 0;
3232 break;
3233 }
3234 }
3235
e93a9a86 3236 if (retval)
3e795de7 3237 goto err;
3e795de7 3238
e93a9a86 3239 if (!con_is_bound(csw))
3e795de7 3240 goto err;
3e795de7
AD		 3241
3242 first = max(first, con_driver->first);
3243 last = min(last, con_driver->last);
3244
3245 for (i = first; i <= last; i++) {
1da177e4
LT		 3246 if (con_driver_map[i] == csw) {
3247 module_put(csw->owner);
3248 con_driver_map[i] = NULL;
3249 }
3e795de7
AD		 3250 }
3251
3252 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3253 const struct consw *defconsw = conswitchp;
3254
3e795de7
AD		 3255 defcsw->con_startup();
3256 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3257 /*
3258 * vgacon may change the default driver to point
3259 * to dummycon, we restore it here...
3260 */
3261 conswitchp = defconsw;
3e795de7
AD		 3262 }
3263
3264 if (!con_is_bound(csw))
3265 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3266
6db4063c 3267 /* ignore return value, binding should not fail */
50e244cc 3268 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3269err:
3270 module_put(owner);
3271 return retval;
3272
3273}
e93a9a86 3274EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3275
6db4063c
AD		 3276static int vt_bind(struct con_driver *con)
3277{
3278 const struct consw *defcsw = NULL, *csw = NULL;
3279 int i, more = 1, first = -1, last = -1, deflt = 0;
3280
77232f79 3281 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3282 goto err;
3283
3284 csw = con->con;
3285
3286 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3287 struct con_driver *con = &registered_con_driver[i];
3288
3289 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3290 defcsw = con->con;
3291 break;
3292 }
3293 }
3294
3295 if (!defcsw)
3296 goto err;
3297
3298 while (more) {
3299 more = 0;
3300
3301 for (i = con->first; i <= con->last; i++) {
3302 if (con_driver_map[i] == defcsw) {
3303 if (first == -1)
3304 first = i;
3305 last = i;
3306 more = 1;
3307 } else if (first != -1)
3308 break;
3309 }
3310
3311 if (first == 0 && last == MAX_NR_CONSOLES -1)
3312 deflt = 1;
3313
4c215fe8 3314 if (first != -1)
c62a1e57 3315 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3316
3317 first = -1;
3318 last = -1;
3319 deflt = 0;
3320 }
3321
3322err:
3323 return 0;
3324}
3325
3326static int vt_unbind(struct con_driver *con)
3327{
3328 const struct consw *csw = NULL;
3329 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3330 int ret;
6db4063c 3331
77232f79 3332 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3333 goto err;
3334
3335 csw = con->con;
3336
3337 while (more) {
3338 more = 0;
3339
3340 for (i = con->first; i <= con->last; i++) {
3341 if (con_driver_map[i] == csw) {
3342 if (first == -1)
3343 first = i;
3344 last = i;
3345 more = 1;
3346 } else if (first != -1)
3347 break;
3348 }
3349
3350 if (first == 0 && last == MAX_NR_CONSOLES -1)
3351 deflt = 1;
3352
618f2b90 3353 if (first != -1) {
f418f2ec 3354 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3355 if (ret != 0)
3356 return ret;
618f2b90 3357 }
6db4063c
AD		 3358
3359 first = -1;
3360 last = -1;
3361 deflt = 0;
3362 }
3363
3364err:
3365 return 0;
3366}
13ae6645
AD		 3367#else
3368static inline int vt_bind(struct con_driver *con)
3369{
3370 return 0;
3371}
3372static inline int vt_unbind(struct con_driver *con)
3373{
3374 return 0;
3375}
3376#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3377
805952a8 3378static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3379 const char *buf, size_t count)
3380{
805952a8 3381 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3382 int bind = simple_strtoul(buf, NULL, 0);
3383
4c215fe8
ID		 3384 console_lock();
3385
6db4063c
AD		 3386 if (bind)
3387 vt_bind(con);
3388 else
3389 vt_unbind(con);
3390
4c215fe8
ID		 3391 console_unlock();
3392
6db4063c
AD		 3393 return count;
3394}
3395
805952a8
GKH		 3396static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3397 char *buf)
6db4063c 3398{
805952a8 3399 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3400 int bind = con_is_bound(con->con);
3401
3402 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3403}
3404
805952a8
GKH		 3405static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3406 char *buf)
6db4063c 3407{
805952a8 3408 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3409
3410 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3411 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3412 con->desc);
3413
3414}
3415
1083a7be
TI		 3416static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3417static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3418
3419static struct attribute *con_dev_attrs[] = {
3420 &dev_attr_bind.attr,
3421 &dev_attr_name.attr,
3422 NULL
6db4063c
AD		 3423};
3424
1083a7be
TI		 3425ATTRIBUTE_GROUPS(con_dev);
3426
805952a8 3427static int vtconsole_init_device(struct con_driver *con)
6db4063c 3428{
928e964f 3429 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3430 return 0;
6db4063c
AD		 3431}
3432
805952a8 3433static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3434{
1083a7be 3435 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3436}
3437
3e795de7
AD		 3438/**
3439 * con_is_bound - checks if driver is bound to the console
3440 * @csw: console driver
3441 *
3442 * RETURNS: zero if unbound, nonzero if bound
3443 *
3444 * Drivers can call this and if zero, they should release
3445 * all resources allocated on con_startup()
3446 */
3447int con_is_bound(const struct consw *csw)
3448{
3449 int i, bound = 0;
3450
3451 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3452 if (con_driver_map[i] == csw) {
3453 bound = 1;
3454 break;
3455 }
3456 }
3457
3458 return bound;
3459}
3460EXPORT_SYMBOL(con_is_bound);
3461
b45cfba4
JB		 3462/**
3463 * con_debug_enter - prepare the console for the kernel debugger
3464 * @sw: console driver
3465 *
3466 * Called when the console is taken over by the kernel debugger, this
3467 * function needs to save the current console state, then put the console
3468 * into a state suitable for the kernel debugger.
3469 *
3470 * RETURNS:
3471 * Zero on success, nonzero if a failure occurred when trying to prepare
3472 * the console for the debugger.
3473 */
3474int con_debug_enter(struct vc_data *vc)
3475{
3476 int ret = 0;
3477
3478 saved_fg_console = fg_console;
3479 saved_last_console = last_console;
3480 saved_want_console = want_console;
3481 saved_vc_mode = vc->vc_mode;
beed5336 3482 saved_console_blanked = console_blanked;
b45cfba4
JB		 3483 vc->vc_mode = KD_TEXT;
3484 console_blanked = 0;
3485 if (vc->vc_sw->con_debug_enter)
3486 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3487#ifdef CONFIG_KGDB_KDB
3488 /* Set the initial LINES variable if it is not already set */
3489 if (vc->vc_rows < 999) {
3490 int linecount;
3491 char lns[4];
3492 const char *setargs[3] = {
3493 "set",
3494 "LINES",
3495 lns,
3496 };
3497 if (kdbgetintenv(setargs[0], &linecount)) {
3498 snprintf(lns, 4, "%i", vc->vc_rows);
3499 kdb_set(2, setargs);
3500 }
3501 }
17b572e8
JW		 3502 if (vc->vc_cols < 999) {
3503 int colcount;
3504 char cols[4];
3505 const char *setargs[3] = {
3506 "set",
3507 "COLUMNS",
3508 cols,
3509 };
3510 if (kdbgetintenv(setargs[0], &colcount)) {
3511 snprintf(cols, 4, "%i", vc->vc_cols);
3512 kdb_set(2, setargs);
3513 }
3514 }
81d44507 3515#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3516 return ret;
3517}
3518EXPORT_SYMBOL_GPL(con_debug_enter);
3519
3520/**
3521 * con_debug_leave - restore console state
3522 * @sw: console driver
3523 *
3524 * Restore the console state to what it was before the kernel debugger
3525 * was invoked.
3526 *
3527 * RETURNS:
3528 * Zero on success, nonzero if a failure occurred when trying to restore
3529 * the console.
3530 */
3531int con_debug_leave(void)
3532{
3533 struct vc_data *vc;
3534 int ret = 0;
3535
3536 fg_console = saved_fg_console;
3537 last_console = saved_last_console;
3538 want_console = saved_want_console;
beed5336 3539 console_blanked = saved_console_blanked;
b45cfba4
JB		 3540 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3541
3542 vc = vc_cons[fg_console].d;
3543 if (vc->vc_sw->con_debug_leave)
3544 ret = vc->vc_sw->con_debug_leave(vc);
3545 return ret;
3546}
3547EXPORT_SYMBOL_GPL(con_debug_leave);
3548
50e244cc 3549static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 3550{
3551 struct module *owner = csw->owner;
3552 struct con_driver *con_driver;
3553 const char *desc;
96317e9e 3554 int i, retval;
3e795de7 3555
50e244cc
AC		 3556 WARN_CONSOLE_UNLOCKED();
3557
3e795de7
AD		 3558 if (!try_module_get(owner))
3559 return -ENODEV;
3560
3e795de7
AD		 3561 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3562 con_driver = &registered_con_driver[i];
3563
3564 /* already registered */
96317e9e 3565 if (con_driver->con == csw) {
c55c63c6 3566 retval = -EBUSY;
96317e9e
JS		 3567 goto err;
3568 }
3e795de7
AD		 3569 }
3570
3e795de7 3571 desc = csw->con_startup();
6798df4c
JS		 3572 if (!desc) {
3573 retval = -ENODEV;
3e795de7 3574 goto err;
6798df4c 3575 }
3e795de7
AD		 3576
3577 retval = -EINVAL;
3578
3579 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3580 con_driver = &registered_con_driver[i];
3581
d364b5c3
ID		 3582 if (con_driver->con == NULL &&
3583 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 3584 con_driver->con = csw;
3585 con_driver->desc = desc;
6db4063c
AD		 3586 con_driver->node = i;
3587 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3588 CON_DRIVER_FLAG_INIT;
3589 con_driver->first = first;
3590 con_driver->last = last;
3591 retval = 0;
3592 break;
3593 }
3594 }
3595
6db4063c
AD		 3596 if (retval)
3597 goto err;
3598
1083a7be
TI		 3599 con_driver->dev =
3600 device_create_with_groups(vtconsole_class, NULL,
3601 MKDEV(0, con_driver->node),
3602 con_driver, con_dev_groups,
3603 "vtcon%i", con_driver->node);
805952a8
GKH		 3604 if (IS_ERR(con_driver->dev)) {
3605 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3606 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3607 PTR_ERR(con_driver->dev));
3608 con_driver->dev = NULL;
6db4063c 3609 } else {
805952a8 3610 vtconsole_init_device(con_driver);
6db4063c 3611 }
928e964f 3612
3e795de7 3613err:
3e795de7
AD		 3614 module_put(owner);
3615 return retval;
3616}
50e244cc 3617
3e795de7
AD		 3618
3619/**
50539dd4 3620 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 3621 * @csw: console driver
3622 *
3623 * DESCRIPTION: All drivers that registers to the console layer must
3624 * call this function upon exit, or if the console driver is in a state
3625 * where it won't be able to handle console services, such as the
3626 * framebuffer console without loaded framebuffer drivers.
3627 *
3628 * The driver must unbind first prior to unregistration.
3629 */
e93a9a86
TI		 3630int do_unregister_con_driver(const struct consw *csw)
3631{
d9c660e7 3632 int i;
3e795de7
AD		 3633
3634 /* cannot unregister a bound driver */
3635 if (con_is_bound(csw))
d9c660e7
DV		 3636 return -EBUSY;
3637
3638 if (csw == conswitchp)
3639 return -EINVAL;
3e795de7
AD		 3640
3641 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3642 struct con_driver *con_driver = &registered_con_driver[i];
3643
2cf30f75 3644 if (con_driver->con == csw) {
d364b5c3
ID		 3645 /*
3646 * Defer the removal of the sysfs entries since that
3647 * will acquire the kernfs s_active lock and we can't
3648 * acquire this lock while holding the console lock:
3649 * the unbind sysfs entry imposes already the opposite
3650 * order. Reset con already here to prevent any later
3651 * lookup to succeed and mark this slot as zombie, so
3652 * it won't get reused until we complete the removal
3653 * in the deferred work.
3654 */
3e795de7 3655 con_driver->con = NULL;
d364b5c3
ID		 3656 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3657 schedule_work(&con_driver_unregister_work);
3658
d9c660e7 3659 return 0;
3e795de7
AD		 3660 }
3661 }
d9c660e7
DV		 3662
3663 return -ENODEV;
3e795de7 3664}
e93a9a86 3665EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 3666
d364b5c3
ID		 3667static void con_driver_unregister_callback(struct work_struct *ignored)
3668{
3669 int i;
3670
3671 console_lock();
3672
3673 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3674 struct con_driver *con_driver = &registered_con_driver[i];
3675
3676 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3677 continue;
3678
3679 console_unlock();
3680
3681 vtconsole_deinit_device(con_driver);
3682 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3683
3684 console_lock();
3685
3686 if (WARN_ON_ONCE(con_driver->con))
3687 con_driver->con = NULL;
3688 con_driver->desc = NULL;
3689 con_driver->dev = NULL;
3690 con_driver->node = 0;
3691 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3692 con_driver->flag = 0;
3693 con_driver->first = 0;
3694 con_driver->last = 0;
3695 }
3696
3697 console_unlock();
3698}
3699
3e795de7
AD		 3700/*
3701 * If we support more console drivers, this function is used
3702 * when a driver wants to take over some existing consoles
3703 * and become default driver for newly opened ones.
3704 *
155957f5 3705 * do_take_over_console is basically a register followed by unbind
50e244cc
AC		 3706 */
3707int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3708{
3709 int err;
3710
3711 err = do_register_con_driver(csw, first, last);
3712 /*
3713 * If we get an busy error we still want to bind the console driver
3714 * and return success, as we may have unbound the console driver
3715 * but not unregistered it.
3716 */
3717 if (err == -EBUSY)
3718 err = 0;
3719 if (!err)
3720 do_bind_con_driver(csw, first, last, deflt);
3721
3722 return err;
3723}
3724EXPORT_SYMBOL_GPL(do_take_over_console);
3725
3e795de7
AD		 3726
3727/*
3728 * give_up_console is a wrapper to unregister_con_driver. It will only
3729 * work if driver is fully unbound.
3730 */
3731void give_up_console(const struct consw *csw)
3732{
70125e76
WY		 3733 console_lock();
3734 do_unregister_con_driver(csw);
3735 console_unlock();
3e795de7
AD		 3736}
3737
6db4063c 3738static int __init vtconsole_class_init(void)
3e795de7 3739{
6db4063c 3740 int i;
3e795de7 3741
6db4063c
AD		 3742 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3743 if (IS_ERR(vtconsole_class)) {
3744 printk(KERN_WARNING "Unable to create vt console class; "
3745 "errno = %ld\n", PTR_ERR(vtconsole_class));
3746 vtconsole_class = NULL;
3747 }
3e795de7 3748
6db4063c 3749 /* Add system drivers to sysfs */
3e795de7
AD		 3750 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3751 struct con_driver *con = &registered_con_driver[i];
3752
805952a8 3753 if (con->con && !con->dev) {
1083a7be
TI		 3754 con->dev =
3755 device_create_with_groups(vtconsole_class, NULL,
3756 MKDEV(0, con->node),
3757 con, con_dev_groups,
3758 "vtcon%i", con->node);
6db4063c 3759
805952a8 3760 if (IS_ERR(con->dev)) {
6db4063c 3761 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3762 "device for %s; errno = %ld\n",
3763 con->desc, PTR_ERR(con->dev));
3764 con->dev = NULL;
6db4063c 3765 } else {
805952a8 3766 vtconsole_init_device(con);
6db4063c 3767 }
3e795de7 3768 }
3e795de7
AD		 3769 }
3770
3e795de7
AD		 3771 return 0;
3772}
6db4063c 3773postcore_initcall(vtconsole_class_init);
3e795de7 3774
1da177e4
LT		 3775#endif
3776
3777/*
3778 * Screen blanking
3779 */
3780
403aac96 3781static int set_vesa_blanking(char __user *p)
1da177e4 3782{
403aac96
YY		 3783 unsigned int mode;
3784
3785 if (get_user(mode, p + 1))
3786 return -EFAULT;
3787
3788 vesa_blank_mode = (mode < 4) ? mode : 0;
3789 return 0;
1da177e4
LT		 3790}
3791
1da177e4
LT		 3792void do_blank_screen(int entering_gfx)
3793{
3794 struct vc_data *vc = vc_cons[fg_console].d;
3795 int i;
3796
3797 WARN_CONSOLE_UNLOCKED();
3798
3799 if (console_blanked) {
3800 if (blank_state == blank_vesa_wait) {
3801 blank_state = blank_off;
d060a321 3802 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3803 }
3804 return;
3805 }
1da177e4
LT		 3806
3807 /* entering graphics mode? */
3808 if (entering_gfx) {
3809 hide_cursor(vc);
3810 save_screen(vc);
3811 vc->vc_sw->con_blank(vc, -1, 1);
3812 console_blanked = fg_console + 1;
b6e8f00f 3813 blank_state = blank_off;
1da177e4
LT		 3814 set_origin(vc);
3815 return;
3816 }
3817
b6e8f00f 3818 if (blank_state != blank_normal_wait)
3819 return;
3820 blank_state = blank_off;
3821
1da177e4
LT		 3822 /* don't blank graphics */
3823 if (vc->vc_mode != KD_TEXT) {
3824 console_blanked = fg_console + 1;
3825 return;
3826 }
3827
3828 hide_cursor(vc);
3829 del_timer_sync(&console_timer);
3830 blank_timer_expired = 0;
3831
3832 save_screen(vc);
3833 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3834 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3835 console_blanked = fg_console + 1;
3836 if (i)
3837 set_origin(vc);
3838
3839 if (console_blank_hook && console_blank_hook(1))
3840 return;
3841
d060a321 3842 if (vesa_off_interval && vesa_blank_mode) {
030babac 3843 blank_state = blank_vesa_wait;
1da177e4
LT		 3844 mod_timer(&console_timer, jiffies + vesa_off_interval);
3845 }
8b92e87d 3846 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3847}
3848EXPORT_SYMBOL(do_blank_screen);
3849
3850/*
3851 * Called by timer as well as from vt_console_driver
3852 */
3853void do_unblank_screen(int leaving_gfx)
3854{
3855 struct vc_data *vc;
3856
3857 /* This should now always be called from a "sane" (read: can schedule)
3858 * context for the sake of the low level drivers, except in the special
3859 * case of oops_in_progress
3860 */
3861 if (!oops_in_progress)
3862 might_sleep();
3863
3864 WARN_CONSOLE_UNLOCKED();
3865
3866 ignore_poke = 0;
3867 if (!console_blanked)
3868 return;
3869 if (!vc_cons_allocated(fg_console)) {
3870 /* impossible */
e620e548
JP		 3871 pr_warn("unblank_screen: tty %d not allocated ??\n",
3872 fg_console + 1);
1da177e4
LT		 3873 return;
3874 }
3875 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3876 /* Try to unblank in oops case too */
3877 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3878 return; /* but leave console_blanked != 0 */
3879
3880 if (blankinterval) {
f324edc8 3881 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3882 blank_state = blank_normal_wait;
3883 }
3884
3885 console_blanked = 0;
8fd4bd22 3886 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3887 /* Low-level driver cannot restore -> do it ourselves */
3888 update_screen(vc);
3889 if (console_blank_hook)
3890 console_blank_hook(0);
3891 set_palette(vc);
3892 set_cursor(vc);
8b92e87d 3893 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3894}
3895EXPORT_SYMBOL(do_unblank_screen);
3896
3897/*
3898 * This is called by the outside world to cause a forced unblank, mostly for
3899 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3900 * call it with 1 as an argument and so force a mode restore... that may kill
3901 * X or at least garbage the screen but would also make the Oops visible...
3902 */
3903void unblank_screen(void)
3904{
3905 do_unblank_screen(0);
3906}
3907
3908/*
70522e12 3909 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3910 * (console operations can still happen at irq time, but only from printk which
70522e12 3911 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3912 */
3913static void blank_screen_t(unsigned long dummy)
3914{
cc63b1e1 3915 if (unlikely(!keventd_up())) {
f324edc8 3916 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3917 return;
3918 }
1da177e4
LT		 3919 blank_timer_expired = 1;
3920 schedule_work(&console_work);
3921}
3922
3923void poke_blanked_console(void)
3924{
3925 WARN_CONSOLE_UNLOCKED();
3926
3927 /* Add this so we quickly catch whoever might call us in a non
3928 * safe context. Nowadays, unblank_screen() isn't to be called in
3929 * atomic contexts and is allowed to schedule (with the special case
3930 * of oops_in_progress, but that isn't of any concern for this
3931 * function. --BenH.
3932 */
3933 might_sleep();
3934
3935 /* This isn't perfectly race free, but a race here would be mostly harmless,
3936 * at worse, we'll do a spurrious blank and it's unlikely
3937 */
3938 del_timer(&console_timer);
3939 blank_timer_expired = 0;
3940
3941 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3942 return;
3943 if (console_blanked)
3944 unblank_screen();
3945 else if (blankinterval) {
f324edc8 3946 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3947 blank_state = blank_normal_wait;
3948 }
3949}
3950
3951/*
3952 * Palettes
3953 */
3954
3955static void set_palette(struct vc_data *vc)
3956{
3957 WARN_CONSOLE_UNLOCKED();
3958
709280da 3959 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
1da177e4
LT		 3960 vc->vc_sw->con_set_palette(vc, color_table);
3961}
3962
1da177e4
LT		 3963/*
3964 * Load palette into the DAC registers. arg points to a colour
3965 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3966 */
3967
3968int con_set_cmap(unsigned char __user *arg)
3969{
871bdea6
MG		 3970 int i, j, k;
3971 unsigned char colormap[3*16];
3972
3973 if (copy_from_user(colormap, arg, sizeof(colormap)))
3974 return -EFAULT;
1da177e4 3975
ac751efa 3976 console_lock();
871bdea6
MG		 3977 for (i = k = 0; i < 16; i++) {
3978 default_red[i] = colormap[k++];
3979 default_grn[i] = colormap[k++];
3980 default_blu[i] = colormap[k++];
3981 }
3982 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3983 if (!vc_cons_allocated(i))
3984 continue;
3985 for (j = k = 0; j < 16; j++) {
3986 vc_cons[i].d->vc_palette[k++] = default_red[j];
3987 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3988 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3989 }
3990 set_palette(vc_cons[i].d);
3991 }
ac751efa 3992 console_unlock();
1da177e4 3993
871bdea6 3994 return 0;
1da177e4
LT		 3995}
3996
3997int con_get_cmap(unsigned char __user *arg)
3998{
871bdea6
MG		 3999 int i, k;
4000 unsigned char colormap[3*16];
1da177e4 4001
ac751efa 4002 console_lock();
871bdea6
MG		 4003 for (i = k = 0; i < 16; i++) {
4004 colormap[k++] = default_red[i];
4005 colormap[k++] = default_grn[i];
4006 colormap[k++] = default_blu[i];
4007 }
ac751efa 4008 console_unlock();
1da177e4 4009
871bdea6
MG		 4010 if (copy_to_user(arg, colormap, sizeof(colormap)))
4011 return -EFAULT;
4012
4013 return 0;
1da177e4
LT		 4014}
4015
4016void reset_palette(struct vc_data *vc)
4017{
4018 int j, k;
4019 for (j=k=0; j<16; j++) {
4020 vc->vc_palette[k++] = default_red[j];
4021 vc->vc_palette[k++] = default_grn[j];
4022 vc->vc_palette[k++] = default_blu[j];
4023 }
4024 set_palette(vc);
4025}
4026
4027/*
4028 * Font switching
4029 *
4030 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4031 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4032 * depending on width) reserved for each character which is kinda wasty, but
4033 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4034 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4035 * format (maybe we should add a `fontoffset' field to the `display'
4036 * structure so we won't have to convert the fontdata all the time.
4037 * /Jes
4038 */
4039
4040#define max_font_size 65536
4041
4042static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4043{
4044 struct console_font font;
4045 int rc = -EINVAL;
4046 int c;
4047
1da177e4
LT		 4048 if (op->data) {
4049 font.data = kmalloc(max_font_size, GFP_KERNEL);
4050 if (!font.data)
4051 return -ENOMEM;
4052 } else
4053 font.data = NULL;
4054
ac751efa 4055 console_lock();
edab558f
AC		 4056 if (vc->vc_mode != KD_TEXT)
4057 rc = -EINVAL;
4058 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4059 rc = vc->vc_sw->con_font_get(vc, &font);
4060 else
4061 rc = -ENOSYS;
ac751efa 4062 console_unlock();
1da177e4
LT		 4063
4064 if (rc)
4065 goto out;
4066
4067 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4068
1da177e4
LT		 4069 if (op->data && font.charcount > op->charcount)
4070 rc = -ENOSPC;
4071 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4072 if (font.width > op->width || font.height > op->height)
4073 rc = -ENOSPC;
4074 } else {
4075 if (font.width != 8)
4076 rc = -EIO;
4077 else if ((op->height && font.height > op->height) ||
4078 font.height > 32)
4079 rc = -ENOSPC;
4080 }
4081 if (rc)
4082 goto out;
4083
4084 op->height = font.height;
4085 op->width = font.width;
4086 op->charcount = font.charcount;
4087
4088 if (op->data && copy_to_user(op->data, font.data, c))
4089 rc = -EFAULT;
4090
4091out:
4092 kfree(font.data);
4093 return rc;
4094}
4095
4096static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4097{
4098 struct console_font font;
4099 int rc = -EINVAL;
4100 int size;
4101
4102 if (vc->vc_mode != KD_TEXT)
4103 return -EINVAL;
4104 if (!op->data)
4105 return -EINVAL;
4106 if (op->charcount > 512)
4107 return -EINVAL;
4108 if (!op->height) { /* Need to guess font height [compat] */
4109 int h, i;
4110 u8 __user *charmap = op->data;
4111 u8 tmp;
4112
4113 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4114 so that we can get rid of this soon */
4115 if (!(op->flags & KD_FONT_FLAG_OLD))
4116 return -EINVAL;
4117 for (h = 32; h > 0; h--)
4118 for (i = 0; i < op->charcount; i++) {
4119 if (get_user(tmp, &charmap[32*i+h-1]))
4120 return -EFAULT;
4121 if (tmp)
4122 goto nonzero;
4123 }
4124 return -EINVAL;
4125 nonzero:
4126 op->height = h;
4127 }
4128 if (op->width <= 0 || op->width > 32 || op->height > 32)
4129 return -EINVAL;
4130 size = (op->width+7)/8 * 32 * op->charcount;
4131 if (size > max_font_size)
4132 return -ENOSPC;
4133 font.charcount = op->charcount;
4134 font.height = op->height;
4135 font.width = op->width;
9b71ca20
JL		 4136 font.data = memdup_user(op->data, size);
4137 if (IS_ERR(font.data))
4138 return PTR_ERR(font.data);
ac751efa 4139 console_lock();
edab558f
AC		 4140 if (vc->vc_mode != KD_TEXT)
4141 rc = -EINVAL;
4142 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4143 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4144 else
4145 rc = -ENOSYS;
ac751efa 4146 console_unlock();
1da177e4
LT		 4147 kfree(font.data);
4148 return rc;
4149}
4150
4151static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4152{
4153 struct console_font font = {.width = op->width, .height = op->height};
4154 char name[MAX_FONT_NAME];
4155 char *s = name;
4156 int rc;
4157
1da177e4
LT		 4158
4159 if (!op->data)
4160 s = NULL;
4161 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4162 return -EFAULT;
4163 else
4164 name[MAX_FONT_NAME - 1] = 0;
4165
ac751efa 4166 console_lock();
edab558f
AC		 4167 if (vc->vc_mode != KD_TEXT) {
4168 console_unlock();
4169 return -EINVAL;
4170 }
1da177e4
LT		 4171 if (vc->vc_sw->con_font_default)
4172 rc = vc->vc_sw->con_font_default(vc, &font, s);
4173 else
4174 rc = -ENOSYS;
ac751efa 4175 console_unlock();
1da177e4
LT		 4176 if (!rc) {
4177 op->width = font.width;
4178 op->height = font.height;
4179 }
4180 return rc;
4181}
4182
4183static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4184{
4185 int con = op->height;
4186 int rc;
4187
1da177e4 4188
ac751efa 4189 console_lock();
edab558f
AC		 4190 if (vc->vc_mode != KD_TEXT)
4191 rc = -EINVAL;
4192 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4193 rc = -ENOSYS;
4194 else if (con < 0 || !vc_cons_allocated(con))
4195 rc = -ENOTTY;
4196 else if (con == vc->vc_num) /* nothing to do */
4197 rc = 0;
4198 else
4199 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4200 console_unlock();
1da177e4
LT		 4201 return rc;
4202}
4203
4204int con_font_op(struct vc_data *vc, struct console_font_op *op)
4205{
4206 switch (op->op) {
4207 case KD_FONT_OP_SET:
4208 return con_font_set(vc, op);
4209 case KD_FONT_OP_GET:
4210 return con_font_get(vc, op);
4211 case KD_FONT_OP_SET_DEFAULT:
4212 return con_font_default(vc, op);
4213 case KD_FONT_OP_COPY:
4214 return con_font_copy(vc, op);
4215 }
4216 return -ENOSYS;
4217}
4218
4219/*
4220 * Interface exported to selection and vcs.
4221 */
4222
4223/* used by selection */
4224u16 screen_glyph(struct vc_data *vc, int offset)
4225{
4226 u16 w = scr_readw(screenpos(vc, offset, 1));
4227 u16 c = w & 0xff;
4228
4229 if (w & vc->vc_hi_font_mask)
4230 c |= 0x100;
4231 return c;
4232}
f7511d5f 4233EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4234
4235/* used by vcs - note the word offset */
4236unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4237{
4238 return screenpos(vc, 2 * w_offset, viewed);
4239}
88867e3d 4240EXPORT_SYMBOL_GPL(screen_pos);
1da177e4
LT		 4241
4242void getconsxy(struct vc_data *vc, unsigned char *p)
4243{
4244 p[0] = vc->vc_x;
4245 p[1] = vc->vc_y;
4246}
4247
4248void putconsxy(struct vc_data *vc, unsigned char *p)
4249{
9477e260 4250 hide_cursor(vc);
1da177e4
LT		 4251 gotoxy(vc, p[0], p[1]);
4252 set_cursor(vc);
4253}
4254
4255u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4256{
4257 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4258 return softcursor_original;
4259 return scr_readw(org);
4260}
4261
4262void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4263{
4264 scr_writew(val, org);
4265 if ((unsigned long)org == vc->vc_pos) {
4266 softcursor_original = -1;
4267 add_softcursor(vc);
4268 }
4269}
4270
432c9ed2
NP		 4271void vcs_scr_updated(struct vc_data *vc)
4272{
4273 notify_update(vc);
4274}
4275
1da177e4
LT		 4276/*
4277 * Visible symbols for modules
4278 */
4279
4280EXPORT_SYMBOL(color_table);
4281EXPORT_SYMBOL(default_red);
4282EXPORT_SYMBOL(default_grn);
4283EXPORT_SYMBOL(default_blu);
4284EXPORT_SYMBOL(update_region);
4285EXPORT_SYMBOL(redraw_screen);
4286EXPORT_SYMBOL(vc_resize);
4287EXPORT_SYMBOL(fg_console);
4288EXPORT_SYMBOL(console_blank_hook);
4289EXPORT_SYMBOL(console_blanked);
4290EXPORT_SYMBOL(vc_cons);
f6c06b68 4291EXPORT_SYMBOL(global_cursor_default);
1da177e4 4292#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4293EXPORT_SYMBOL(give_up_console);
4294#endif
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