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tty: vt, too many commands per line in rgb_foreground
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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{
193df022
JS		 1263 u8 hue = 0, max = max3(c->r, c->g, c->b);
1264
1265 if (c->r > max / 2)
1266 hue |= 4;
1267 if (c->g > max / 2)
1268 hue |= 2;
1269 if (c->b > max / 2)
1270 hue |= 1;
1271
1272 if (hue == 7 && max <= 0x55) {
1273 hue = 0;
1274 vc->vc_intensity = 2;
1275 } else if (max > 0xaa)
1276 vc->vc_intensity = 2;
cec5b2a9 1277 else
193df022
JS		 1278 vc->vc_intensity = 1;
1279
cec5b2a9
AB		 1280 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1281}
1282
0f91e142 1283static void rgb_background(struct vc_data *vc, const struct rgb *c)
cec5b2a9
AB		 1284{
1285 /* For backgrounds, err on the dark side. */
1286 vc->vc_color = (vc->vc_color & 0x0f)
0f91e142 1287 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
cec5b2a9
AB		 1288}
1289
e05ab238
JS		 1290/*
1291 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1292 * and thus need to be detected and ignored by hand. Strictly speaking, that
1293 * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1294 * no one produces such codes and almost no one accepts them.
1295 *
1296 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1297 * supporting them.
1298 */
1299static int vc_t416_color(struct vc_data *vc, int i,
0f91e142 1300 void(*set_color)(struct vc_data *vc, const struct rgb *c))
e05ab238 1301{
0f91e142
JS		 1302 struct rgb c;
1303
e05ab238
JS		 1304 i++;
1305 if (i > vc->vc_npar)
1306 return i;
1307
1308 if (vc->vc_par[i] == 5 && i < vc->vc_npar) {
1309 /* 256 colours -- ubiquitous */
1310 i++;
0f91e142 1311 rgb_from_256(vc->vc_par[i], &c);
e05ab238
JS		 1312 } else if (vc->vc_par[i] == 2 && i <= vc->vc_npar + 3) {
1313 /* 24 bit -- extremely rare */
0f91e142
JS		 1314 c.r = vc->vc_par[i + 1];
1315 c.g = vc->vc_par[i + 2];
1316 c.b = vc->vc_par[i + 3];
e05ab238 1317 i += 3;
0f91e142
JS		 1318 } else
1319 return i;
1320
1321 set_color(vc, &c);
e05ab238
JS		 1322
1323 return i;
1324}
1325
ac751efa 1326/* console_lock is held */
1da177e4
LT		 1327static void csi_m(struct vc_data *vc)
1328{
1329 int i;
1330
1331 for (i = 0; i <= vc->vc_npar; i++)
1332 switch (vc->vc_par[i]) {
1333 case 0: /* all attributes off */
1334 default_attr(vc);
1335 break;
1336 case 1:
1337 vc->vc_intensity = 2;
1338 break;
1339 case 2:
1340 vc->vc_intensity = 0;
1341 break;
fa6ce9ab
JE		 1342 case 3:
1343 vc->vc_italic = 1;
1344 break;
1da177e4
LT		 1345 case 4:
1346 vc->vc_underline = 1;
1347 break;
1348 case 5:
1349 vc->vc_blink = 1;
1350 break;
1351 case 7:
1352 vc->vc_reverse = 1;
1353 break;
1354 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1355 * Select primary font, don't display
1356 * control chars if defined, don't set
1357 * bit 8 on output.
1358 */
1359 vc->vc_translate = set_translate(vc->vc_charset == 0
1360 ? vc->vc_G0_charset
1361 : vc->vc_G1_charset, vc);
1362 vc->vc_disp_ctrl = 0;
1363 vc->vc_toggle_meta = 0;
1364 break;
1365 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1366 * Select first alternate font, lets
1367 * chars < 32 be displayed as ROM chars.
1368 */
1369 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1370 vc->vc_disp_ctrl = 1;
1371 vc->vc_toggle_meta = 0;
1372 break;
1373 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1374 * Select second alternate font, toggle
1375 * high bit before displaying as ROM char.
1376 */
1377 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1378 vc->vc_disp_ctrl = 1;
1379 vc->vc_toggle_meta = 1;
1380 break;
1381 case 21:
1382 case 22:
1383 vc->vc_intensity = 1;
1384 break;
fa6ce9ab
JE		 1385 case 23:
1386 vc->vc_italic = 0;
1387 break;
1da177e4
LT		 1388 case 24:
1389 vc->vc_underline = 0;
1390 break;
1391 case 25:
1392 vc->vc_blink = 0;
1393 break;
1394 case 27:
1395 vc->vc_reverse = 0;
1396 break;
e05ab238
JS		 1397 case 38:
1398 i = vc_t416_color(vc, i, rgb_foreground);
3415097f 1399 break;
cec5b2a9 1400 case 48:
e05ab238 1401 i = vc_t416_color(vc, i, rgb_background);
cec5b2a9 1402 break;
64545880 1403 case 39:
1da177e4 1404 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1da177e4
LT		 1405 break;
1406 case 49:
1407 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1408 break;
1409 default:
1410 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1411 vc->vc_color = color_table[vc->vc_par[i] - 30]
1412 | (vc->vc_color & 0xf0);
1413 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1414 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1415 | (vc->vc_color & 0x0f);
1416 break;
1417 }
1418 update_attr(vc);
1419}
1420
6732c8bb 1421static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1422{
1423 while (*p) {
6732c8bb 1424 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1425 p++;
1426 }
6732c8bb 1427 tty_schedule_flip(port);
1da177e4
LT		 1428}
1429
1430static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1431{
1432 char buf[40];
1433
1434 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1435 respond_string(buf, tty->port);
1da177e4
LT		 1436}
1437
1438static inline void status_report(struct tty_struct *tty)
1439{
6732c8bb 1440 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1441}
1442
6732c8bb 1443static inline void respond_ID(struct tty_struct *tty)
1da177e4 1444{
6732c8bb 1445 respond_string(VT102ID, tty->port);
1da177e4
LT		 1446}
1447
1448void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1449{
1450 char buf[8];
1451
1452 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1453 (char)('!' + mry));
6732c8bb 1454 respond_string(buf, tty->port);
1da177e4
LT		 1455}
1456
1457/* invoked via ioctl(TIOCLINUX) and through set_selection */
1458int mouse_reporting(void)
1459{
1460 return vc_cons[fg_console].d->vc_report_mouse;
1461}
1462
ac751efa 1463/* console_lock is held */
1da177e4
LT		 1464static void set_mode(struct vc_data *vc, int on_off)
1465{
1466 int i;
1467
1468 for (i = 0; i <= vc->vc_npar; i++)
1469 if (vc->vc_ques) {
1470 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1471 case 1: /* Cursor keys send ^[Ox/^[[x */
1472 if (on_off)
1473 set_kbd(vc, decckm);
1474 else
1475 clr_kbd(vc, decckm);
1476 break;
1477 case 3: /* 80/132 mode switch unimplemented */
1478 vc->vc_deccolm = on_off;
1479#if 0
1480 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1481 /* this alone does not suffice; some user mode
1482 utility has to change the hardware regs */
1483#endif
1484 break;
1485 case 5: /* Inverted screen on/off */
1486 if (vc->vc_decscnm != on_off) {
1487 vc->vc_decscnm = on_off;
1488 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1489 update_attr(vc);
1490 }
1491 break;
1492 case 6: /* Origin relative/absolute */
1493 vc->vc_decom = on_off;
1494 gotoxay(vc, 0, 0);
1495 break;
1496 case 7: /* Autowrap on/off */
1497 vc->vc_decawm = on_off;
1498 break;
1499 case 8: /* Autorepeat on/off */
1500 if (on_off)
1501 set_kbd(vc, decarm);
1502 else
1503 clr_kbd(vc, decarm);
1504 break;
1505 case 9:
1506 vc->vc_report_mouse = on_off ? 1 : 0;
1507 break;
1508 case 25: /* Cursor on/off */
1509 vc->vc_deccm = on_off;
1510 break;
1511 case 1000:
1512 vc->vc_report_mouse = on_off ? 2 : 0;
1513 break;
1514 }
1515 } else {
1516 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1517 case 3: /* Monitor (display ctrls) */
1518 vc->vc_disp_ctrl = on_off;
1519 break;
1520 case 4: /* Insert Mode on/off */
1521 vc->vc_decim = on_off;
1522 break;
1523 case 20: /* Lf, Enter == CrLf/Lf */
1524 if (on_off)
1525 set_kbd(vc, lnm);
1526 else
1527 clr_kbd(vc, lnm);
1528 break;
1529 }
1530 }
1531}
1532
ac751efa 1533/* console_lock is held */
1da177e4
LT		 1534static void setterm_command(struct vc_data *vc)
1535{
1536 switch(vc->vc_par[0]) {
1537 case 1: /* set color for underline mode */
1538 if (vc->vc_can_do_color &&
1539 vc->vc_par[1] < 16) {
1540 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1541 if (vc->vc_underline)
1542 update_attr(vc);
1543 }
1544 break;
1545 case 2: /* set color for half intensity mode */
1546 if (vc->vc_can_do_color &&
1547 vc->vc_par[1] < 16) {
1548 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1549 if (vc->vc_intensity == 0)
1550 update_attr(vc);
1551 }
1552 break;
1553 case 8: /* store colors as defaults */
1554 vc->vc_def_color = vc->vc_attr;
1555 if (vc->vc_hi_font_mask == 0x100)
1556 vc->vc_def_color >>= 1;
1557 default_attr(vc);
1558 update_attr(vc);
1559 break;
1560 case 9: /* set blanking interval */
f324edc8 1561 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1562 poke_blanked_console();
1563 break;
1564 case 10: /* set bell frequency in Hz */
1565 if (vc->vc_npar >= 1)
1566 vc->vc_bell_pitch = vc->vc_par[1];
1567 else
1568 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1569 break;
1570 case 11: /* set bell duration in msec */
1571 if (vc->vc_npar >= 1)
1572 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
3372ec28 1573 msecs_to_jiffies(vc->vc_par[1]) : 0;
1da177e4
LT		 1574 else
1575 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1576 break;
1577 case 12: /* bring specified console to the front */
1578 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1579 set_console(vc->vc_par[1] - 1);
1580 break;
1581 case 13: /* unblank the screen */
1582 poke_blanked_console();
1583 break;
1584 case 14: /* set vesa powerdown interval */
1585 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1586 break;
1587 case 15: /* activate the previous console */
1588 set_console(last_console);
1589 break;
bd63364c
SD		 1590 case 16: /* set cursor blink duration in msec */
1591 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1592 vc->vc_par[1] <= USHRT_MAX)
1593 vc->vc_cur_blink_ms = vc->vc_par[1];
1594 else
1595 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1596 break;
1da177e4
LT		 1597 }
1598}
1599
ac751efa 1600/* console_lock is held */
1da177e4
LT		 1601static void csi_at(struct vc_data *vc, unsigned int nr)
1602{
1603 if (nr > vc->vc_cols - vc->vc_x)
1604 nr = vc->vc_cols - vc->vc_x;
1605 else if (!nr)
1606 nr = 1;
1607 insert_char(vc, nr);
1608}
1609
ac751efa 1610/* console_lock is held */
1da177e4
LT		 1611static void csi_L(struct vc_data *vc, unsigned int nr)
1612{
1613 if (nr > vc->vc_rows - vc->vc_y)
1614 nr = vc->vc_rows - vc->vc_y;
1615 else if (!nr)
1616 nr = 1;
1617 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1618 vc->vc_need_wrap = 0;
1619}
1620
ac751efa 1621/* console_lock is held */
1da177e4
LT		 1622static void csi_P(struct vc_data *vc, unsigned int nr)
1623{
1624 if (nr > vc->vc_cols - vc->vc_x)
1625 nr = vc->vc_cols - vc->vc_x;
1626 else if (!nr)
1627 nr = 1;
1628 delete_char(vc, nr);
1629}
1630
ac751efa 1631/* console_lock is held */
1da177e4
LT		 1632static void csi_M(struct vc_data *vc, unsigned int nr)
1633{
1634 if (nr > vc->vc_rows - vc->vc_y)
1635 nr = vc->vc_rows - vc->vc_y;
1636 else if (!nr)
1637 nr=1;
1638 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1639 vc->vc_need_wrap = 0;
1640}
1641
ac751efa 1642/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1643static void save_cur(struct vc_data *vc)
1644{
1645 vc->vc_saved_x = vc->vc_x;
1646 vc->vc_saved_y = vc->vc_y;
1647 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1648 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1649 vc->vc_s_underline = vc->vc_underline;
1650 vc->vc_s_blink = vc->vc_blink;
1651 vc->vc_s_reverse = vc->vc_reverse;
1652 vc->vc_s_charset = vc->vc_charset;
1653 vc->vc_s_color = vc->vc_color;
1654 vc->vc_saved_G0 = vc->vc_G0_charset;
1655 vc->vc_saved_G1 = vc->vc_G1_charset;
1656}
1657
ac751efa 1658/* console_lock is held */
1da177e4
LT		 1659static void restore_cur(struct vc_data *vc)
1660{
1661 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1662 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1663 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1664 vc->vc_underline = vc->vc_s_underline;
1665 vc->vc_blink = vc->vc_s_blink;
1666 vc->vc_reverse = vc->vc_s_reverse;
1667 vc->vc_charset = vc->vc_s_charset;
1668 vc->vc_color = vc->vc_s_color;
1669 vc->vc_G0_charset = vc->vc_saved_G0;
1670 vc->vc_G1_charset = vc->vc_saved_G1;
1671 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1672 update_attr(vc);
1673 vc->vc_need_wrap = 0;
1674}
1675
b290af68 1676enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1da177e4 1677 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
63f3a16d 1678 ESpalette, ESosc };
1da177e4 1679
ac751efa 1680/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1681static void reset_terminal(struct vc_data *vc, int do_clear)
1682{
1683 vc->vc_top = 0;
1684 vc->vc_bottom = vc->vc_rows;
1685 vc->vc_state = ESnormal;
1686 vc->vc_ques = 0;
1687 vc->vc_translate = set_translate(LAT1_MAP, vc);
1688 vc->vc_G0_charset = LAT1_MAP;
1689 vc->vc_G1_charset = GRAF_MAP;
1690 vc->vc_charset = 0;
1691 vc->vc_need_wrap = 0;
1692 vc->vc_report_mouse = 0;
042f10ec 1693 vc->vc_utf = default_utf8;
1da177e4
LT		 1694 vc->vc_utf_count = 0;
1695
1696 vc->vc_disp_ctrl = 0;
1697 vc->vc_toggle_meta = 0;
1698
1699 vc->vc_decscnm = 0;
1700 vc->vc_decom = 0;
1701 vc->vc_decawm = 1;
f6c06b68 1702 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1703 vc->vc_decim = 0;
1704
079c9534 1705 vt_reset_keyboard(vc->vc_num);
1da177e4 1706
9ea9a886 1707 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1708 vc->vc_complement_mask = vc->vc_s_complement_mask;
1709
1710 default_attr(vc);
1711 update_attr(vc);
1712
1713 vc->vc_tab_stop[0] = 0x01010100;
1714 vc->vc_tab_stop[1] =
1715 vc->vc_tab_stop[2] =
1716 vc->vc_tab_stop[3] =
a564738c
WK		 1717 vc->vc_tab_stop[4] =
1718 vc->vc_tab_stop[5] =
1719 vc->vc_tab_stop[6] =
1720 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1721
1722 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1723 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 1724 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1725
1726 gotoxy(vc, 0, 0);
1727 save_cur(vc);
1728 if (do_clear)
1729 csi_J(vc, 2);
1730}
1731
ac751efa 1732/* console_lock is held */
1da177e4
LT		 1733static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1734{
1735 /*
1736 * Control characters can be used in the _middle_
1737 * of an escape sequence.
1738 */
63f3a16d
AB		 1739 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1740 return;
1da177e4
LT		 1741 switch (c) {
1742 case 0:
1743 return;
1744 case 7:
63f3a16d
AB		 1745 if (vc->vc_state == ESosc)
1746 vc->vc_state = ESnormal;
1747 else if (vc->vc_bell_duration)
1da177e4
LT		 1748 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1749 return;
1750 case 8:
1751 bs(vc);
1752 return;
1753 case 9:
1754 vc->vc_pos -= (vc->vc_x << 1);
1755 while (vc->vc_x < vc->vc_cols - 1) {
1756 vc->vc_x++;
1757 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1758 break;
1759 }
1760 vc->vc_pos += (vc->vc_x << 1);
b293d758 1761 notify_write(vc, '\t');
1da177e4
LT		 1762 return;
1763 case 10: case 11: case 12:
1764 lf(vc);
1765 if (!is_kbd(vc, lnm))
1766 return;
1767 case 13:
1768 cr(vc);
1769 return;
1770 case 14:
1771 vc->vc_charset = 1;
1772 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1773 vc->vc_disp_ctrl = 1;
1774 return;
1775 case 15:
1776 vc->vc_charset = 0;
1777 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1778 vc->vc_disp_ctrl = 0;
1779 return;
1780 case 24: case 26:
1781 vc->vc_state = ESnormal;
1782 return;
1783 case 27:
1784 vc->vc_state = ESesc;
1785 return;
1786 case 127:
1787 del(vc);
1788 return;
1789 case 128+27:
1790 vc->vc_state = ESsquare;
1791 return;
1792 }
1793 switch(vc->vc_state) {
1794 case ESesc:
1795 vc->vc_state = ESnormal;
1796 switch (c) {
1797 case '[':
1798 vc->vc_state = ESsquare;
1799 return;
1800 case ']':
1801 vc->vc_state = ESnonstd;
1802 return;
1803 case '%':
1804 vc->vc_state = ESpercent;
1805 return;
1806 case 'E':
1807 cr(vc);
1808 lf(vc);
1809 return;
1810 case 'M':
1811 ri(vc);
1812 return;
1813 case 'D':
1814 lf(vc);
1815 return;
1816 case 'H':
1817 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1818 return;
1819 case 'Z':
1820 respond_ID(tty);
1821 return;
1822 case '7':
1823 save_cur(vc);
1824 return;
1825 case '8':
1826 restore_cur(vc);
1827 return;
1828 case '(':
1829 vc->vc_state = ESsetG0;
1830 return;
1831 case ')':
1832 vc->vc_state = ESsetG1;
1833 return;
1834 case '#':
1835 vc->vc_state = EShash;
1836 return;
1837 case 'c':
1838 reset_terminal(vc, 1);
1839 return;
1840 case '>': /* Numeric keypad */
1841 clr_kbd(vc, kbdapplic);
1842 return;
1843 case '=': /* Appl. keypad */
1844 set_kbd(vc, kbdapplic);
1845 return;
1846 }
1847 return;
1848 case ESnonstd:
1849 if (c=='P') { /* palette escape sequence */
1850 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1851 vc->vc_par[vc->vc_npar] = 0;
1852 vc->vc_npar = 0;
1853 vc->vc_state = ESpalette;
1854 return;
1855 } else if (c=='R') { /* reset palette */
1856 reset_palette(vc);
1857 vc->vc_state = ESnormal;
63f3a16d
AB		 1858 } else if (c>='0' && c<='9')
1859 vc->vc_state = ESosc;
1860 else
1da177e4
LT		 1861 vc->vc_state = ESnormal;
1862 return;
1863 case ESpalette:
74c807ce
AS		 1864 if (isxdigit(c)) {
1865 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1866 if (vc->vc_npar == 7) {
1867 int i = vc->vc_par[0] * 3, j = 1;
1868 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1869 vc->vc_palette[i++] += vc->vc_par[j++];
1870 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1871 vc->vc_palette[i++] += vc->vc_par[j++];
1872 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1873 vc->vc_palette[i] += vc->vc_par[j];
1874 set_palette(vc);
1875 vc->vc_state = ESnormal;
1876 }
1877 } else
1878 vc->vc_state = ESnormal;
1879 return;
1880 case ESsquare:
1881 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1882 vc->vc_par[vc->vc_npar] = 0;
1883 vc->vc_npar = 0;
1884 vc->vc_state = ESgetpars;
1885 if (c == '[') { /* Function key */
1886 vc->vc_state=ESfunckey;
1887 return;
1888 }
1889 vc->vc_ques = (c == '?');
1890 if (vc->vc_ques)
1891 return;
1892 case ESgetpars:
1893 if (c == ';' && vc->vc_npar < NPAR - 1) {
1894 vc->vc_npar++;
1895 return;
1896 } else if (c>='0' && c<='9') {
1897 vc->vc_par[vc->vc_npar] *= 10;
1898 vc->vc_par[vc->vc_npar] += c - '0';
1899 return;
b290af68 1900 }
1da177e4
LT		 1901 vc->vc_state = ESnormal;
1902 switch(c) {
1903 case 'h':
1904 set_mode(vc, 1);
1905 return;
1906 case 'l':
1907 set_mode(vc, 0);
1908 return;
1909 case 'c':
1910 if (vc->vc_ques) {
1911 if (vc->vc_par[0])
1912 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1913 else
9ea9a886 1914 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1915 return;
1916 }
1917 break;
1918 case 'm':
1919 if (vc->vc_ques) {
1920 clear_selection();
1921 if (vc->vc_par[0])
1922 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1923 else
1924 vc->vc_complement_mask = vc->vc_s_complement_mask;
1925 return;
1926 }
1927 break;
1928 case 'n':
1929 if (!vc->vc_ques) {
1930 if (vc->vc_par[0] == 5)
1931 status_report(tty);
1932 else if (vc->vc_par[0] == 6)
1933 cursor_report(vc, tty);
1934 }
1935 return;
1936 }
1937 if (vc->vc_ques) {
1938 vc->vc_ques = 0;
1939 return;
1940 }
1941 switch(c) {
1942 case 'G': case '`':
1943 if (vc->vc_par[0])
1944 vc->vc_par[0]--;
1945 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1946 return;
1947 case 'A':
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 'B': case 'e':
1953 if (!vc->vc_par[0])
1954 vc->vc_par[0]++;
1955 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1956 return;
1957 case 'C': case 'a':
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 'D':
1963 if (!vc->vc_par[0])
1964 vc->vc_par[0]++;
1965 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1966 return;
1967 case 'E':
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 'F':
1973 if (!vc->vc_par[0])
1974 vc->vc_par[0]++;
1975 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1976 return;
1977 case 'd':
1978 if (vc->vc_par[0])
1979 vc->vc_par[0]--;
1980 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1981 return;
1982 case 'H': case 'f':
1983 if (vc->vc_par[0])
1984 vc->vc_par[0]--;
1985 if (vc->vc_par[1])
1986 vc->vc_par[1]--;
1987 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1988 return;
1989 case 'J':
1990 csi_J(vc, vc->vc_par[0]);
1991 return;
1992 case 'K':
1993 csi_K(vc, vc->vc_par[0]);
1994 return;
1995 case 'L':
1996 csi_L(vc, vc->vc_par[0]);
1997 return;
1998 case 'M':
1999 csi_M(vc, vc->vc_par[0]);
2000 return;
2001 case 'P':
2002 csi_P(vc, vc->vc_par[0]);
2003 return;
2004 case 'c':
2005 if (!vc->vc_par[0])
2006 respond_ID(tty);
2007 return;
2008 case 'g':
2009 if (!vc->vc_par[0])
2010 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2011 else if (vc->vc_par[0] == 3) {
2012 vc->vc_tab_stop[0] =
2013 vc->vc_tab_stop[1] =
2014 vc->vc_tab_stop[2] =
2015 vc->vc_tab_stop[3] =
a564738c
WK		 2016 vc->vc_tab_stop[4] =
2017 vc->vc_tab_stop[5] =
2018 vc->vc_tab_stop[6] =
2019 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 2020 }
2021 return;
2022 case 'm':
2023 csi_m(vc);
2024 return;
2025 case 'q': /* DECLL - but only 3 leds */
2026 /* map 0,1,2,3 to 0,1,2,4 */
2027 if (vc->vc_par[0] < 4)
079c9534 2028 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2029 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2030 return;
2031 case 'r':
2032 if (!vc->vc_par[0])
2033 vc->vc_par[0]++;
2034 if (!vc->vc_par[1])
2035 vc->vc_par[1] = vc->vc_rows;
2036 /* Minimum allowed region is 2 lines */
2037 if (vc->vc_par[0] < vc->vc_par[1] &&
2038 vc->vc_par[1] <= vc->vc_rows) {
2039 vc->vc_top = vc->vc_par[0] - 1;
2040 vc->vc_bottom = vc->vc_par[1];
2041 gotoxay(vc, 0, 0);
2042 }
2043 return;
2044 case 's':
2045 save_cur(vc);
2046 return;
2047 case 'u':
2048 restore_cur(vc);
2049 return;
2050 case 'X':
2051 csi_X(vc, vc->vc_par[0]);
2052 return;
2053 case '@':
2054 csi_at(vc, vc->vc_par[0]);
2055 return;
2056 case ']': /* setterm functions */
2057 setterm_command(vc);
2058 return;
2059 }
2060 return;
2061 case ESpercent:
2062 vc->vc_state = ESnormal;
2063 switch (c) {
2064 case '@': /* defined in ISO 2022 */
2065 vc->vc_utf = 0;
2066 return;
2067 case 'G': /* prelim official escape code */
2068 case '8': /* retained for compatibility */
2069 vc->vc_utf = 1;
2070 return;
2071 }
2072 return;
2073 case ESfunckey:
2074 vc->vc_state = ESnormal;
2075 return;
2076 case EShash:
2077 vc->vc_state = ESnormal;
2078 if (c == '8') {
2079 /* DEC screen alignment test. kludge :-) */
2080 vc->vc_video_erase_char =
2081 (vc->vc_video_erase_char & 0xff00) | 'E';
2082 csi_J(vc, 2);
2083 vc->vc_video_erase_char =
2084 (vc->vc_video_erase_char & 0xff00) | ' ';
2085 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2086 }
2087 return;
2088 case ESsetG0:
2089 if (c == '0')
2090 vc->vc_G0_charset = GRAF_MAP;
2091 else if (c == 'B')
2092 vc->vc_G0_charset = LAT1_MAP;
2093 else if (c == 'U')
2094 vc->vc_G0_charset = IBMPC_MAP;
2095 else if (c == 'K')
2096 vc->vc_G0_charset = USER_MAP;
2097 if (vc->vc_charset == 0)
2098 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2099 vc->vc_state = ESnormal;
2100 return;
2101 case ESsetG1:
2102 if (c == '0')
2103 vc->vc_G1_charset = GRAF_MAP;
2104 else if (c == 'B')
2105 vc->vc_G1_charset = LAT1_MAP;
2106 else if (c == 'U')
2107 vc->vc_G1_charset = IBMPC_MAP;
2108 else if (c == 'K')
2109 vc->vc_G1_charset = USER_MAP;
2110 if (vc->vc_charset == 1)
2111 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2112 vc->vc_state = ESnormal;
2113 return;
63f3a16d
AB		 2114 case ESosc:
2115 return;
1da177e4
LT		 2116 default:
2117 vc->vc_state = ESnormal;
2118 }
2119}
2120
2f1a2ccb 2121/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2122 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2123 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2124 */
2125struct interval {
2126 uint32_t first;
2127 uint32_t last;
2128};
2129
2130static int bisearch(uint32_t ucs, const struct interval *table, int max)
2131{
2132 int min = 0;
2133 int mid;
2134
2135 if (ucs < table[0].first || ucs > table[max].last)
2136 return 0;
2137 while (max >= min) {
2138 mid = (min + max) / 2;
2139 if (ucs > table[mid].last)
2140 min = mid + 1;
2141 else if (ucs < table[mid].first)
2142 max = mid - 1;
2143 else
2144 return 1;
2145 }
2146 return 0;
2147}
2148
2149static int is_double_width(uint32_t ucs)
2150{
2151 static const struct interval double_width[] = {
2152 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2153 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2154 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2155 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2156 };
0f11541b 2157 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2158}
2159
d711ea8f
JS		 2160static void con_flush(struct vc_data *vc, unsigned long draw_from,
2161 unsigned long draw_to, int *draw_x)
2162{
2163 if (*draw_x < 0)
2164 return;
2165
2166 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2167 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2168 *draw_x = -1;
2169}
2170
ac751efa 2171/* acquires console_lock */
1da177e4
LT		 2172static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2173{
1da177e4
LT		 2174 int c, tc, ok, n = 0, draw_x = -1;
2175 unsigned int currcons;
2176 unsigned long draw_from = 0, draw_to = 0;
2177 struct vc_data *vc;
2f1a2ccb 2178 unsigned char vc_attr;
0341a4d0 2179 struct vt_notifier_param param;
2f1a2ccb
EK		 2180 uint8_t rescan;
2181 uint8_t inverse;
2182 uint8_t width;
1da177e4 2183 u16 himask, charmask;
1da177e4
LT		 2184
2185 if (in_interrupt())
2186 return count;
2187
2188 might_sleep();
2189
ac751efa 2190 console_lock();
1da177e4
LT		 2191 vc = tty->driver_data;
2192 if (vc == NULL) {
2193 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2194 console_unlock();
1da177e4
LT		 2195 return 0;
2196 }
2197
2198 currcons = vc->vc_num;
2199 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2200 /* could this happen? */
2201 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2202 console_unlock();
2203 return 0;
1da177e4 2204 }
1da177e4 2205
1da177e4
LT		 2206 himask = vc->vc_hi_font_mask;
2207 charmask = himask ? 0x1ff : 0xff;
2208
2209 /* undraw cursor first */
2210 if (IS_FG(vc))
2211 hide_cursor(vc);
2212
0341a4d0
KD		 2213 param.vc = vc;
2214
1da177e4
LT		 2215 while (!tty->stopped && count) {
2216 int orig = *buf;
2217 c = orig;
2218 buf++;
2219 n++;
2220 count--;
2f1a2ccb
EK		 2221 rescan = 0;
2222 inverse = 0;
2223 width = 1;
1da177e4
LT		 2224
2225 /* Do no translation at all in control states */
2226 if (vc->vc_state != ESnormal) {
2227 tc = c;
d4328b40 2228 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2229 /* Combine UTF-8 into Unicode in vc_utf_char.
2230 * vc_utf_count is the number of continuation bytes still
2231 * expected to arrive.
2232 * vc_npar is the number of continuation bytes arrived so
2233 * far
2234 */
d4328b40 2235rescan_last_byte:
2f1a2ccb
EK		 2236 if ((c & 0xc0) == 0x80) {
2237 /* Continuation byte received */
2238 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2239 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2240 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2241 vc->vc_npar++;
2242 if (--vc->vc_utf_count) {
2243 /* Still need some bytes */
1da177e4 2244 continue;
2f1a2ccb
EK		 2245 }
2246 /* Got a whole character */
2247 c = vc->vc_utf_char;
2248 /* Reject overlong sequences */
2249 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2250 c > utf8_length_changes[vc->vc_npar])
2251 c = 0xfffd;
2252 } else {
2253 /* Unexpected continuation byte */
2254 vc->vc_utf_count = 0;
2255 c = 0xfffd;
2256 }
1da177e4 2257 } else {
2f1a2ccb
EK		 2258 /* Single ASCII byte or first byte of a sequence received */
2259 if (vc->vc_utf_count) {
2260 /* Continuation byte expected */
2261 rescan = 1;
2262 vc->vc_utf_count = 0;
2263 c = 0xfffd;
2264 } else if (c > 0x7f) {
2265 /* First byte of a multibyte sequence received */
2266 vc->vc_npar = 0;
2267 if ((c & 0xe0) == 0xc0) {
2268 vc->vc_utf_count = 1;
2269 vc->vc_utf_char = (c & 0x1f);
2270 } else if ((c & 0xf0) == 0xe0) {
2271 vc->vc_utf_count = 2;
2272 vc->vc_utf_char = (c & 0x0f);
2273 } else if ((c & 0xf8) == 0xf0) {
2274 vc->vc_utf_count = 3;
2275 vc->vc_utf_char = (c & 0x07);
2276 } else if ((c & 0xfc) == 0xf8) {
2277 vc->vc_utf_count = 4;
2278 vc->vc_utf_char = (c & 0x03);
2279 } else if ((c & 0xfe) == 0xfc) {
2280 vc->vc_utf_count = 5;
2281 vc->vc_utf_char = (c & 0x01);
2282 } else {
2283 /* 254 and 255 are invalid */
2284 c = 0xfffd;
2285 }
2286 if (vc->vc_utf_count) {
2287 /* Still need some bytes */
2288 continue;
2289 }
2290 }
2291 /* Nothing to do if an ASCII byte was received */
1da177e4 2292 }
2f1a2ccb
EK		 2293 /* End of UTF-8 decoding. */
2294 /* c is the received character, or U+FFFD for invalid sequences. */
2295 /* Replace invalid Unicode code points with U+FFFD too */
2296 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2297 c = 0xfffd;
2298 tc = c;
d4328b40 2299 } else { /* no utf or alternate charset mode */
a29ccf6f 2300 tc = vc_translate(vc, c);
1da177e4
LT		 2301 }
2302
0341a4d0
KD		 2303 param.c = tc;
2304 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2305 &param) == NOTIFY_STOP)
2306 continue;
2307
1da177e4
LT		 2308 /* If the original code was a control character we
2309 * only allow a glyph to be displayed if the code is
2310 * not normally used (such as for cursor movement) or
2311 * if the disp_ctrl mode has been explicitly enabled.
2312 * Certain characters (as given by the CTRL_ALWAYS
2313 * bitmap) are always displayed as control characters,
2314 * as the console would be pretty useless without
2315 * them; to display an arbitrary font position use the
2316 * direct-to-font zone in UTF-8 mode.
2317 */
2318 ok = tc && (c >= 32 ||
d4328b40
AT		 2319 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2320 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2321 && (c != 127 || vc->vc_disp_ctrl)
2322 && (c != 128+27);
2323
2324 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2325 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2326 if (is_double_width(c))
2327 width = 2;
2328 }
1da177e4
LT		 2329 /* Now try to find out how to display it */
2330 tc = conv_uni_to_pc(vc, tc);
d4328b40 2331 if (tc & ~charmask) {
2f1a2ccb
EK		 2332 if (tc == -1 || tc == -2) {
2333 continue; /* nothing to display */
2334 }
2335 /* Glyph not found */
c0b79882 2336 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2337 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2338 This would make absolutely no sense with Unicode in mind,
2339 but do this for ASCII characters since a font may lack
2340 Unicode mapping info and we don't want to end up with
2341 having question marks only. */
2f1a2ccb
EK		 2342 tc = c;
2343 } else {
2344 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2345 tc = conv_uni_to_pc(vc, 0xfffd);
2346 if (tc < 0) {
2347 inverse = 1;
2348 tc = conv_uni_to_pc(vc, '?');
2349 if (tc < 0) tc = '?';
2350 }
2351 }
d4328b40 2352 }
1da177e4 2353
2f1a2ccb
EK		 2354 if (!inverse) {
2355 vc_attr = vc->vc_attr;
1da177e4 2356 } else {
2f1a2ccb
EK		 2357 /* invert vc_attr */
2358 if (!vc->vc_can_do_color) {
2359 vc_attr = (vc->vc_attr) ^ 0x08;
2360 } else if (vc->vc_hi_font_mask == 0x100) {
2361 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2362 } else {
2363 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2364 }
d711ea8f 2365 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4 2366 }
2f1a2ccb
EK		 2367
2368 while (1) {
2369 if (vc->vc_need_wrap || vc->vc_decim)
d711ea8f
JS		 2370 con_flush(vc, draw_from, draw_to,
2371 &draw_x);
2f1a2ccb
EK		 2372 if (vc->vc_need_wrap) {
2373 cr(vc);
2374 lf(vc);
2375 }
2376 if (vc->vc_decim)
2377 insert_char(vc, 1);
2378 scr_writew(himask ?
2379 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2380 (vc_attr << 8) + tc,
2381 (u16 *) vc->vc_pos);
2382 if (DO_UPDATE(vc) && draw_x < 0) {
2383 draw_x = vc->vc_x;
2384 draw_from = vc->vc_pos;
2385 }
2386 if (vc->vc_x == vc->vc_cols - 1) {
2387 vc->vc_need_wrap = vc->vc_decawm;
2388 draw_to = vc->vc_pos + 2;
2389 } else {
2390 vc->vc_x++;
2391 draw_to = (vc->vc_pos += 2);
d4328b40 2392 }
2f1a2ccb
EK		 2393
2394 if (!--width) break;
2395
2396 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2397 if (tc < 0) tc = ' ';
2398 }
b293d758 2399 notify_write(vc, c);
2f1a2ccb 2400
d711ea8f
JS		 2401 if (inverse)
2402 con_flush(vc, draw_from, draw_to, &draw_x);
1ed8a2b3 2403
2f1a2ccb
EK		 2404 if (rescan) {
2405 rescan = 0;
2406 inverse = 0;
2407 width = 1;
d4328b40
AT		 2408 c = orig;
2409 goto rescan_last_byte;
2410 }
1da177e4
LT		 2411 continue;
2412 }
d711ea8f 2413 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4
LT		 2414 do_con_trol(tty, vc, orig);
2415 }
d711ea8f 2416 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4 2417 console_conditional_schedule();
ac751efa 2418 console_unlock();
b293d758 2419 notify_update(vc);
1da177e4 2420 return n;
1da177e4
LT		 2421}
2422
2423/*
2424 * This is the console switching callback.
2425 *
2426 * Doing console switching in a process context allows
2427 * us to do the switches asynchronously (needed when we want
2428 * to switch due to a keyboard interrupt). Synchronization
2429 * with other console code and prevention of re-entrancy is
ac751efa 2430 * ensured with console_lock.
1da177e4 2431 */
65f27f38 2432static void console_callback(struct work_struct *ignored)
1da177e4 2433{
ac751efa 2434 console_lock();
1da177e4
LT		 2435
2436 if (want_console >= 0) {
2437 if (want_console != fg_console &&
2438 vc_cons_allocated(want_console)) {
2439 hide_cursor(vc_cons[fg_console].d);
2440 change_console(vc_cons[want_console].d);
2441 /* we only changed when the console had already
2442 been allocated - a new console is not created
2443 in an interrupt routine */
2444 }
2445 want_console = -1;
2446 }
2447 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2448 do_poke_blanked_console = 0;
2449 poke_blanked_console();
2450 }
2451 if (scrollback_delta) {
2452 struct vc_data *vc = vc_cons[fg_console].d;
2453 clear_selection();
97293de9 2454 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
1da177e4
LT		 2455 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2456 scrollback_delta = 0;
2457 }
2458 if (blank_timer_expired) {
2459 do_blank_screen(0);
2460 blank_timer_expired = 0;
2461 }
b293d758 2462 notify_update(vc_cons[fg_console].d);
1da177e4 2463
ac751efa 2464 console_unlock();
1da177e4
LT		 2465}
2466
b257bc05 2467int set_console(int nr)
1da177e4 2468{
b257bc05
AJ		 2469 struct vc_data *vc = vc_cons[fg_console].d;
2470
2471 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2472 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2473
2474 /*
2475 * Console switch will fail in console_callback() or
2476 * change_console() so there is no point scheduling
2477 * the callback
2478 *
2479 * Existing set_console() users don't check the return
2480 * value so this shouldn't break anything
2481 */
2482 return -EINVAL;
2483 }
2484
1da177e4
LT		 2485 want_console = nr;
2486 schedule_console_callback();
b257bc05
AJ		 2487
2488 return 0;
1da177e4
LT		 2489}
2490
2491struct tty_driver *console_driver;
2492
2493#ifdef CONFIG_VT_CONSOLE
2494
5ada918b
BW		 2495/**
2496 * vt_kmsg_redirect() - Sets/gets the kernel message console
2497 * @new: The new virtual terminal number or -1 if the console should stay
2498 * unchanged
2499 *
2500 * By default, the kernel messages are always printed on the current virtual
2501 * console. However, the user may modify that default with the
2502 * TIOCL_SETKMSGREDIRECT ioctl call.
2503 *
2504 * This function sets the kernel message console to be @new. It returns the old
2505 * virtual console number. The virtual terminal number 0 (both as parameter and
2506 * return value) means no redirection (i.e. always printed on the currently
2507 * active console).
2508 *
2509 * The parameter -1 means that only the current console is returned, but the
2510 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2511 * case to make the code more understandable.
2512 *
2513 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2514 * the parameter and always returns 0.
2515 */
2516int vt_kmsg_redirect(int new)
2517{
2518 static int kmsg_con;
2519
2520 if (new != -1)
2521 return xchg(&kmsg_con, new);
2522 else
2523 return kmsg_con;
2524}
2525
1da177e4
LT		 2526/*
2527 * Console on virtual terminal
2528 *
2529 * The console must be locked when we get here.
2530 */
2531
2532static void vt_console_print(struct console *co, const char *b, unsigned count)
2533{
2534 struct vc_data *vc = vc_cons[fg_console].d;
2535 unsigned char c;
b0940003 2536 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2537 const ushort *start;
2538 ushort cnt = 0;
2539 ushort myx;
5ada918b 2540 int kmsg_console;
1da177e4
LT		 2541
2542 /* console busy or not yet initialized */
b0940003
NP		 2543 if (!printable)
2544 return;
2545 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2546 return;
2547
5ada918b
BW		 2548 kmsg_console = vt_get_kmsg_redirect();
2549 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2550 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2551
2552 /* read `x' only after setting currcons properly (otherwise
2553 the `x' macro will read the x of the foreground console). */
2554 myx = vc->vc_x;
2555
2556 if (!vc_cons_allocated(fg_console)) {
2557 /* impossible */
2558 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2559 goto quit;
2560 }
2561
8fd4bd22 2562 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2563 goto quit;
2564
2565 /* undraw cursor first */
2566 if (IS_FG(vc))
2567 hide_cursor(vc);
2568
2569 start = (ushort *)vc->vc_pos;
2570
2571 /* Contrived structure to try to emulate original need_wrap behaviour
2572 * Problems caused when we have need_wrap set on '\n' character */
2573 while (count--) {
2574 c = *b++;
2575 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2576 if (cnt > 0) {
2577 if (CON_IS_VISIBLE(vc))
2578 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2579 vc->vc_x += cnt;
2580 if (vc->vc_need_wrap)
2581 vc->vc_x--;
2582 cnt = 0;
2583 }
2584 if (c == 8) { /* backspace */
2585 bs(vc);
2586 start = (ushort *)vc->vc_pos;
2587 myx = vc->vc_x;
2588 continue;
2589 }
2590 if (c != 13)
2591 lf(vc);
2592 cr(vc);
2593 start = (ushort *)vc->vc_pos;
2594 myx = vc->vc_x;
2595 if (c == 10 || c == 13)
2596 continue;
2597 }
2598 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2599 notify_write(vc, c);
1da177e4
LT		 2600 cnt++;
2601 if (myx == vc->vc_cols - 1) {
2602 vc->vc_need_wrap = 1;
2603 continue;
2604 }
2605 vc->vc_pos += 2;
2606 myx++;
2607 }
2608 if (cnt > 0) {
2609 if (CON_IS_VISIBLE(vc))
2610 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2611 vc->vc_x += cnt;
2612 if (vc->vc_x == vc->vc_cols) {
2613 vc->vc_x--;
2614 vc->vc_need_wrap = 1;
2615 }
2616 }
2617 set_cursor(vc);
b293d758 2618 notify_update(vc);
1da177e4
LT		 2619
2620quit:
b0940003 2621 spin_unlock(&printing_lock);
1da177e4
LT		 2622}
2623
2624static struct tty_driver *vt_console_device(struct console *c, int *index)
2625{
2626 *index = c->index ? c->index-1 : fg_console;
2627 return console_driver;
2628}
2629
2630static struct console vt_console_driver = {
2631 .name = "tty",
2632 .write = vt_console_print,
2633 .device = vt_console_device,
2634 .unblank = unblank_screen,
2635 .flags = CON_PRINTBUFFER,
2636 .index = -1,
2637};
2638#endif
2639
2640/*
2641 * Handling of Linux-specific VC ioctls
2642 */
2643
2644/*
ac751efa 2645 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2646 *
2647 * There are some functions which don't need it.
2648 *
2649 * There are some functions which can sleep for arbitrary periods
2650 * (paste_selection) but we don't need the lock there anyway.
2651 *
2652 * set_selection has locking, and definitely needs it
2653 */
2654
2655int tioclinux(struct tty_struct *tty, unsigned long arg)
2656{
2657 char type, data;
2658 char __user *p = (char __user *)arg;
2659 int lines;
2660 int ret;
2661
1da177e4
LT		 2662 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2663 return -EPERM;
2664 if (get_user(type, p))
2665 return -EFAULT;
2666 ret = 0;
04f378b1 2667
1da177e4
LT		 2668 switch (type)
2669 {
2670 case TIOCL_SETSEL:
ac751efa 2671 console_lock();
1da177e4 2672 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2673 console_unlock();
1da177e4
LT		 2674 break;
2675 case TIOCL_PASTESEL:
2676 ret = paste_selection(tty);
2677 break;
2678 case TIOCL_UNBLANKSCREEN:
ac751efa 2679 console_lock();
1da177e4 2680 unblank_screen();
ac751efa 2681 console_unlock();
1da177e4
LT		 2682 break;
2683 case TIOCL_SELLOADLUT:
5289475d 2684 console_lock();
1da177e4 2685 ret = sel_loadlut(p);
5289475d 2686 console_unlock();
1da177e4
LT		 2687 break;
2688 case TIOCL_GETSHIFTSTATE:
04f378b1 2689
1da177e4
LT		 2690 /*
2691 * Make it possible to react to Shift+Mousebutton.
2692 * Note that 'shift_state' is an undocumented
2693 * kernel-internal variable; programs not closely
2694 * related to the kernel should not use this.
2695 */
079c9534 2696 data = vt_get_shift_state();
1da177e4
LT		 2697 ret = __put_user(data, p);
2698 break;
2699 case TIOCL_GETMOUSEREPORTING:
20f62579 2700 console_lock(); /* May be overkill */
1da177e4 2701 data = mouse_reporting();
20f62579 2702 console_unlock();
1da177e4
LT		 2703 ret = __put_user(data, p);
2704 break;
2705 case TIOCL_SETVESABLANK:
20f62579 2706 console_lock();
403aac96 2707 ret = set_vesa_blanking(p);
20f62579 2708 console_unlock();
1da177e4 2709 break;
0ca07731 2710 case TIOCL_GETKMSGREDIRECT:
5ada918b 2711 data = vt_get_kmsg_redirect();
0ca07731
RW		 2712 ret = __put_user(data, p);
2713 break;
1da177e4
LT		 2714 case TIOCL_SETKMSGREDIRECT:
2715 if (!capable(CAP_SYS_ADMIN)) {
2716 ret = -EPERM;
2717 } else {
2718 if (get_user(data, p+1))
2719 ret = -EFAULT;
2720 else
5ada918b 2721 vt_kmsg_redirect(data);
1da177e4
LT		 2722 }
2723 break;
2724 case TIOCL_GETFGCONSOLE:
20f62579
AC		 2725 /* No locking needed as this is a transiently
2726 correct return anyway if the caller hasn't
2727 disabled switching */
1da177e4
LT		 2728 ret = fg_console;
2729 break;
2730 case TIOCL_SCROLLCONSOLE:
2731 if (get_user(lines, (s32 __user *)(p+4))) {
2732 ret = -EFAULT;
2733 } else {
20f62579
AC		 2734 /* Need the console lock here. Note that lots
2735 of other calls need fixing before the lock
2736 is actually useful ! */
2737 console_lock();
1da177e4 2738 scrollfront(vc_cons[fg_console].d, lines);
20f62579 2739 console_unlock();
1da177e4
LT		 2740 ret = 0;
2741 }
2742 break;
2743 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2744 console_lock();
1da177e4
LT		 2745 ignore_poke = 1;
2746 do_blank_screen(0);
ac751efa 2747 console_unlock();
1da177e4
LT		 2748 break;
2749 case TIOCL_BLANKEDSCREEN:
2750 ret = console_blanked;
2751 break;
2752 default:
2753 ret = -EINVAL;
2754 break;
2755 }
2756 return ret;
2757}
2758
2759/*
2760 * /dev/ttyN handling
2761 */
2762
2763static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2764{
2765 int retval;
2766
2767 retval = do_con_write(tty, buf, count);
2768 con_flush_chars(tty);
2769
2770 return retval;
2771}
2772
5d19f546 2773static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2774{
2775 if (in_interrupt())
5d19f546
AC		 2776 return 0; /* n_r3964 calls put_char() from interrupt context */
2777 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2778}
2779
2780static int con_write_room(struct tty_struct *tty)
2781{
2782 if (tty->stopped)
2783 return 0;
a88a69c9 2784 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2785}
2786
2787static int con_chars_in_buffer(struct tty_struct *tty)
2788{
2789 return 0; /* we're not buffering */
2790}
2791
2792/*
2793 * con_throttle and con_unthrottle are only used for
2794 * paste_selection(), which has to stuff in a large number of
2795 * characters...
2796 */
2797static void con_throttle(struct tty_struct *tty)
2798{
2799}
2800
2801static void con_unthrottle(struct tty_struct *tty)
2802{
2803 struct vc_data *vc = tty->driver_data;
2804
2805 wake_up_interruptible(&vc->paste_wait);
2806}
2807
2808/*
2809 * Turn the Scroll-Lock LED on when the tty is stopped
2810 */
2811static void con_stop(struct tty_struct *tty)
2812{
2813 int console_num;
2814 if (!tty)
2815 return;
2816 console_num = tty->index;
2817 if (!vc_cons_allocated(console_num))
2818 return;
079c9534 2819 vt_kbd_con_stop(console_num);
1da177e4
LT		 2820}
2821
2822/*
2823 * Turn the Scroll-Lock LED off when the console is started
2824 */
2825static void con_start(struct tty_struct *tty)
2826{
2827 int console_num;
2828 if (!tty)
2829 return;
2830 console_num = tty->index;
2831 if (!vc_cons_allocated(console_num))
2832 return;
079c9534 2833 vt_kbd_con_start(console_num);
1da177e4
LT		 2834}
2835
2836static void con_flush_chars(struct tty_struct *tty)
2837{
2838 struct vc_data *vc;
2839
2840 if (in_interrupt()) /* from flush_to_ldisc */
2841 return;
2842
2843 /* if we race with con_close(), vt may be null */
ac751efa 2844 console_lock();
1da177e4
LT		 2845 vc = tty->driver_data;
2846 if (vc)
2847 set_cursor(vc);
ac751efa 2848 console_unlock();
1da177e4
LT		 2849}
2850
2851/*
2852 * Allocate the console screen memory.
2853 */
bc1e99d9 2854static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 2855{
2856 unsigned int currcons = tty->index;
bc1e99d9
JS		 2857 struct vc_data *vc;
2858 int ret;
1da177e4 2859
ac751efa 2860 console_lock();
bc1e99d9
JS		 2861 ret = vc_allocate(currcons);
2862 if (ret)
2863 goto unlock;
feebed65 2864
bc1e99d9 2865 vc = vc_cons[currcons].d;
1da177e4 2866
bc1e99d9
JS		 2867 /* Still being freed */
2868 if (vc->port.tty) {
2869 ret = -ERESTARTSYS;
2870 goto unlock;
2871 }
2872
2873 ret = tty_port_install(&vc->port, driver, tty);
2874 if (ret)
2875 goto unlock;
2876
2877 tty->driver_data = vc;
2878 vc->port.tty = tty;
2879
2880 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2881 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2882 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 2883 }
bc1e99d9 2884 if (vc->vc_utf)
adc8d746 2885 tty->termios.c_iflag |= IUTF8;
bc1e99d9 2886 else
adc8d746 2887 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 2888unlock:
ac751efa 2889 console_unlock();
1da177e4
LT		 2890 return ret;
2891}
2892
bc1e99d9
JS		 2893static int con_open(struct tty_struct *tty, struct file *filp)
2894{
2895 /* everything done in install */
2896 return 0;
2897}
2898
2899
1da177e4
LT		 2900static void con_close(struct tty_struct *tty, struct file *filp)
2901{
feebed65
AC		 2902 /* Nothing to do - we defer to shutdown */
2903}
1da177e4 2904
feebed65
AC		 2905static void con_shutdown(struct tty_struct *tty)
2906{
2907 struct vc_data *vc = tty->driver_data;
2908 BUG_ON(vc == NULL);
ac751efa 2909 console_lock();
8ce73264 2910 vc->port.tty = NULL;
ac751efa 2911 console_unlock();
1da177e4
LT		 2912}
2913
3855ae1c 2914static int default_color = 7; /* white */
fa6ce9ab
JE		 2915static int default_italic_color = 2; // green (ASCII)
2916static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 2917module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 2918module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2919module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2920
1da177e4
LT		 2921static void vc_init(struct vc_data *vc, unsigned int rows,
2922 unsigned int cols, int do_clear)
2923{
2924 int j, k ;
2925
2926 vc->vc_cols = cols;
2927 vc->vc_rows = rows;
2928 vc->vc_size_row = cols << 1;
2929 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2930
2931 set_origin(vc);
2932 vc->vc_pos = vc->vc_origin;
2933 reset_vc(vc);
2934 for (j=k=0; j<16; j++) {
2935 vc->vc_palette[k++] = default_red[j] ;
2936 vc->vc_palette[k++] = default_grn[j] ;
2937 vc->vc_palette[k++] = default_blu[j] ;
2938 }
3855ae1c 2939 vc->vc_def_color = default_color;
fa6ce9ab
JE		 2940 vc->vc_ulcolor = default_underline_color;
2941 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2942 vc->vc_halfcolor = 0x08; /* grey */
2943 init_waitqueue_head(&vc->paste_wait);
2944 reset_terminal(vc, do_clear);
2945}
2946
2947/*
2948 * This routine initializes console interrupts, and does nothing
2949 * else. If you want the screen to clear, call tty_write with
2950 * the appropriate escape-sequence.
2951 */
2952
2953static int __init con_init(void)
2954{
2955 const char *display_desc = NULL;
2956 struct vc_data *vc;
3e795de7 2957 unsigned int currcons = 0, i;
1da177e4 2958
ac751efa 2959 console_lock();
1da177e4
LT		 2960
2961 if (conswitchp)
2962 display_desc = conswitchp->con_startup();
2963 if (!display_desc) {
2964 fg_console = 0;
ac751efa 2965 console_unlock();
1da177e4
LT		 2966 return 0;
2967 }
2968
3e795de7
AD		 2969 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2970 struct con_driver *con_driver = &registered_con_driver[i];
2971
2972 if (con_driver->con == NULL) {
2973 con_driver->con = conswitchp;
2974 con_driver->desc = display_desc;
2975 con_driver->flag = CON_DRIVER_FLAG_INIT;
2976 con_driver->first = 0;
2977 con_driver->last = MAX_NR_CONSOLES - 1;
2978 break;
2979 }
2980 }
2981
2982 for (i = 0; i < MAX_NR_CONSOLES; i++)
2983 con_driver_map[i] = conswitchp;
2984
1da177e4
LT		 2985 if (blankinterval) {
2986 blank_state = blank_normal_wait;
f324edc8 2987 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2988 }
2989
1da177e4 2990 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2991 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2992 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 2993 tty_port_init(&vc->port);
1da177e4 2994 visual_init(vc, currcons, 1);
a5f4f52e 2995 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 2996 vc_init(vc, vc->vc_rows, vc->vc_cols,
2997 currcons || !vc->vc_sw->con_save_screen);
2998 }
2999 currcons = fg_console = 0;
3000 master_display_fg = vc = vc_cons[currcons].d;
3001 set_origin(vc);
3002 save_screen(vc);
3003 gotoxy(vc, vc->vc_x, vc->vc_y);
3004 csi_J(vc, 0);
3005 update_screen(vc);
5da527aa 3006 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3007 vc->vc_can_do_color ? "colour" : "mono",
3008 display_desc, vc->vc_cols, vc->vc_rows);
3009 printable = 1;
1da177e4 3010
ac751efa 3011 console_unlock();
1da177e4
LT		 3012
3013#ifdef CONFIG_VT_CONSOLE
3014 register_console(&vt_console_driver);
3015#endif
3016 return 0;
3017}
3018console_initcall(con_init);
3019
b68e31d0 3020static const struct tty_operations con_ops = {
bc1e99d9 3021 .install = con_install,
1da177e4
LT		 3022 .open = con_open,
3023 .close = con_close,
3024 .write = con_write,
3025 .write_room = con_write_room,
3026 .put_char = con_put_char,
3027 .flush_chars = con_flush_chars,
3028 .chars_in_buffer = con_chars_in_buffer,
3029 .ioctl = vt_ioctl,
e9216651
AB		 3030#ifdef CONFIG_COMPAT
3031 .compat_ioctl = vt_compat_ioctl,
3032#endif
1da177e4
LT		 3033 .stop = con_stop,
3034 .start = con_start,
3035 .throttle = con_throttle,
3036 .unthrottle = con_unthrottle,
8c9a9dd0 3037 .resize = vt_resize,
feebed65 3038 .shutdown = con_shutdown
1da177e4
LT		 3039};
3040
d81ed103
AC		 3041static struct cdev vc0_cdev;
3042
fbc92a34
KS		 3043static ssize_t show_tty_active(struct device *dev,
3044 struct device_attribute *attr, char *buf)
3045{
3046 return sprintf(buf, "tty%d\n", fg_console + 1);
3047}
3048static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3049
1083a7be
TI		 3050static struct attribute *vt_dev_attrs[] = {
3051 &dev_attr_active.attr,
3052 NULL
3053};
3054
3055ATTRIBUTE_GROUPS(vt_dev);
3056
d81ed103 3057int __init vty_init(const struct file_operations *console_fops)
1da177e4 3058{
d81ed103
AC		 3059 cdev_init(&vc0_cdev, console_fops);
3060 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3061 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3062 panic("Couldn't register /dev/tty0 driver\n");
1083a7be
TI		 3063 tty0dev = device_create_with_groups(tty_class, NULL,
3064 MKDEV(TTY_MAJOR, 0), NULL,
3065 vt_dev_groups, "tty0");
fbc92a34
KS		 3066 if (IS_ERR(tty0dev))
3067 tty0dev = NULL;
d81ed103 3068
1da177e4
LT		 3069 vcs_init();
3070
3071 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3072 if (!console_driver)
3073 panic("Couldn't allocate console driver\n");
2f16669d 3074
1da177e4
LT		 3075 console_driver->name = "tty";
3076 console_driver->name_base = 1;
3077 console_driver->major = TTY_MAJOR;
3078 console_driver->minor_start = 1;
3079 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3080 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3081 if (default_utf8)
3082 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3083 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3084 tty_set_operations(console_driver, &con_ops);
3085 if (tty_register_driver(console_driver))
3086 panic("Couldn't register console driver\n");
1da177e4
LT		 3087 kbd_init();
3088 console_map_init();
1da177e4
LT		 3089#ifdef CONFIG_MDA_CONSOLE
3090 mda_console_init();
3091#endif
3092 return 0;
3093}
3094
3095#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3096
3097static struct class *vtconsole_class;
3098
50e244cc 3099static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3100 int deflt)
1da177e4 3101{
3e795de7
AD		 3102 struct module *owner = csw->owner;
3103 const char *desc = NULL;
3104 struct con_driver *con_driver;
3105 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3106
1da177e4
LT		 3107 if (!try_module_get(owner))
3108 return -ENODEV;
3109
50e244cc 3110 WARN_CONSOLE_UNLOCKED();
1c8ce271 3111
3e795de7
AD		 3112 /* check if driver is registered */
3113 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3114 con_driver = &registered_con_driver[i];
3115
3116 if (con_driver->con == csw) {
3117 desc = con_driver->desc;
3118 retval = 0;
3119 break;
3120 }
3121 }
3122
3123 if (retval)
3124 goto err;
3125
3126 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3127 csw->con_startup();
3128 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3129 }
1c8ce271 3130
1da177e4
LT		 3131 if (deflt) {
3132 if (conswitchp)
3133 module_put(conswitchp->owner);
1c8ce271 3134
1da177e4
LT		 3135 __module_get(owner);
3136 conswitchp = csw;
3137 }
3138
3e795de7
AD		 3139 first = max(first, con_driver->first);
3140 last = min(last, con_driver->last);
3141
1da177e4
LT		 3142 for (i = first; i <= last; i++) {
3143 int old_was_color;
3144 struct vc_data *vc = vc_cons[i].d;
3145
3146 if (con_driver_map[i])
3147 module_put(con_driver_map[i]->owner);
3148 __module_get(owner);
3149 con_driver_map[i] = csw;
3150
3151 if (!vc || !vc->vc_sw)
3152 continue;
3153
3154 j = i;
1c8ce271 3155
4ee1acce
DH		 3156 if (CON_IS_VISIBLE(vc)) {
3157 k = i;
1da177e4 3158 save_screen(vc);
4ee1acce
DH		 3159 }
3160
1da177e4
LT		 3161 old_was_color = vc->vc_can_do_color;
3162 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3163 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3164 visual_init(vc, i, 0);
1c8ce271 3165 set_origin(vc);
1da177e4
LT		 3166 update_attr(vc);
3167
3168 /* If the console changed between mono <-> color, then
3169 * the attributes in the screenbuf will be wrong. The
3170 * following resets all attributes to something sane.
3171 */
3172 if (old_was_color != vc->vc_can_do_color)
3173 clear_buffer_attributes(vc);
1da177e4 3174 }
4ee1acce 3175
1ffdda95 3176 pr_info("Console: switching ");
1da177e4
LT		 3177 if (!deflt)
3178 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3179 if (j >= 0) {
3180 struct vc_data *vc = vc_cons[j].d;
3181
1da177e4 3182 printk("to %s %s %dx%d\n",
4ee1acce
DH		 3183 vc->vc_can_do_color ? "colour" : "mono",
3184 desc, vc->vc_cols, vc->vc_rows);
3185
3186 if (k >= 0) {
3187 vc = vc_cons[k].d;
3188 update_screen(vc);
3189 }
3190 } else
1da177e4
LT		 3191 printk("to %s\n", desc);
3192
3e795de7
AD		 3193 retval = 0;
3194err:
1da177e4 3195 module_put(owner);
3e795de7
AD		 3196 return retval;
3197};
1da177e4 3198
50e244cc 3199
13ae6645 3200#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86
TI		 3201/* unlocked version of unbind_con_driver() */
3202int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3203{
3e795de7
AD		 3204 struct module *owner = csw->owner;
3205 const struct consw *defcsw = NULL;
3206 struct con_driver *con_driver = NULL, *con_back = NULL;
3207 int i, retval = -ENODEV;
1da177e4 3208
3e795de7
AD		 3209 if (!try_module_get(owner))
3210 return -ENODEV;
3211
e93a9a86 3212 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3213
3214 /* check if driver is registered and if it is unbindable */
3215 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3216 con_driver = &registered_con_driver[i];
3217
3218 if (con_driver->con == csw &&
6db4063c 3219 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3220 retval = 0;
3221 break;
3222 }
3223 }
3224
e93a9a86 3225 if (retval)
3e795de7 3226 goto err;
3e795de7 3227
6db4063c
AD		 3228 retval = -ENODEV;
3229
3e795de7
AD		 3230 /* check if backup driver exists */
3231 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3232 con_back = &registered_con_driver[i];
3233
249f7b3e 3234 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3235 defcsw = con_back->con;
3236 retval = 0;
3237 break;
3238 }
3239 }
3240
e93a9a86 3241 if (retval)
3e795de7 3242 goto err;
3e795de7 3243
e93a9a86 3244 if (!con_is_bound(csw))
3e795de7 3245 goto err;
3e795de7
AD		 3246
3247 first = max(first, con_driver->first);
3248 last = min(last, con_driver->last);
3249
3250 for (i = first; i <= last; i++) {
1da177e4
LT		 3251 if (con_driver_map[i] == csw) {
3252 module_put(csw->owner);
3253 con_driver_map[i] = NULL;
3254 }
3e795de7
AD		 3255 }
3256
3257 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3258 const struct consw *defconsw = conswitchp;
3259
3e795de7
AD		 3260 defcsw->con_startup();
3261 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3262 /*
3263 * vgacon may change the default driver to point
3264 * to dummycon, we restore it here...
3265 */
3266 conswitchp = defconsw;
3e795de7
AD		 3267 }
3268
3269 if (!con_is_bound(csw))
3270 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3271
6db4063c 3272 /* ignore return value, binding should not fail */
50e244cc 3273 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3274err:
3275 module_put(owner);
3276 return retval;
3277
3278}
e93a9a86 3279EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3280
6db4063c
AD		 3281static int vt_bind(struct con_driver *con)
3282{
3283 const struct consw *defcsw = NULL, *csw = NULL;
3284 int i, more = 1, first = -1, last = -1, deflt = 0;
3285
77232f79 3286 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3287 goto err;
3288
3289 csw = con->con;
3290
3291 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3292 struct con_driver *con = &registered_con_driver[i];
3293
3294 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3295 defcsw = con->con;
3296 break;
3297 }
3298 }
3299
3300 if (!defcsw)
3301 goto err;
3302
3303 while (more) {
3304 more = 0;
3305
3306 for (i = con->first; i <= con->last; i++) {
3307 if (con_driver_map[i] == defcsw) {
3308 if (first == -1)
3309 first = i;
3310 last = i;
3311 more = 1;
3312 } else if (first != -1)
3313 break;
3314 }
3315
3316 if (first == 0 && last == MAX_NR_CONSOLES -1)
3317 deflt = 1;
3318
4c215fe8 3319 if (first != -1)
c62a1e57 3320 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3321
3322 first = -1;
3323 last = -1;
3324 deflt = 0;
3325 }
3326
3327err:
3328 return 0;
3329}
3330
3331static int vt_unbind(struct con_driver *con)
3332{
3333 const struct consw *csw = NULL;
3334 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3335 int ret;
6db4063c 3336
77232f79 3337 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3338 goto err;
3339
3340 csw = con->con;
3341
3342 while (more) {
3343 more = 0;
3344
3345 for (i = con->first; i <= con->last; i++) {
3346 if (con_driver_map[i] == csw) {
3347 if (first == -1)
3348 first = i;
3349 last = i;
3350 more = 1;
3351 } else if (first != -1)
3352 break;
3353 }
3354
3355 if (first == 0 && last == MAX_NR_CONSOLES -1)
3356 deflt = 1;
3357
618f2b90 3358 if (first != -1) {
f418f2ec 3359 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3360 if (ret != 0)
3361 return ret;
618f2b90 3362 }
6db4063c
AD		 3363
3364 first = -1;
3365 last = -1;
3366 deflt = 0;
3367 }
3368
3369err:
3370 return 0;
3371}
13ae6645
AD		 3372#else
3373static inline int vt_bind(struct con_driver *con)
3374{
3375 return 0;
3376}
3377static inline int vt_unbind(struct con_driver *con)
3378{
3379 return 0;
3380}
3381#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3382
805952a8 3383static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3384 const char *buf, size_t count)
3385{
805952a8 3386 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3387 int bind = simple_strtoul(buf, NULL, 0);
3388
4c215fe8
ID		 3389 console_lock();
3390
6db4063c
AD		 3391 if (bind)
3392 vt_bind(con);
3393 else
3394 vt_unbind(con);
3395
4c215fe8
ID		 3396 console_unlock();
3397
6db4063c
AD		 3398 return count;
3399}
3400
805952a8
GKH		 3401static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3402 char *buf)
6db4063c 3403{
805952a8 3404 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3405 int bind = con_is_bound(con->con);
3406
3407 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3408}
3409
805952a8
GKH		 3410static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3411 char *buf)
6db4063c 3412{
805952a8 3413 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3414
3415 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3416 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3417 con->desc);
3418
3419}
3420
1083a7be
TI		 3421static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3422static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3423
3424static struct attribute *con_dev_attrs[] = {
3425 &dev_attr_bind.attr,
3426 &dev_attr_name.attr,
3427 NULL
6db4063c
AD		 3428};
3429
1083a7be
TI		 3430ATTRIBUTE_GROUPS(con_dev);
3431
805952a8 3432static int vtconsole_init_device(struct con_driver *con)
6db4063c 3433{
928e964f 3434 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3435 return 0;
6db4063c
AD		 3436}
3437
805952a8 3438static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3439{
1083a7be 3440 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3441}
3442
3e795de7
AD		 3443/**
3444 * con_is_bound - checks if driver is bound to the console
3445 * @csw: console driver
3446 *
3447 * RETURNS: zero if unbound, nonzero if bound
3448 *
3449 * Drivers can call this and if zero, they should release
3450 * all resources allocated on con_startup()
3451 */
3452int con_is_bound(const struct consw *csw)
3453{
3454 int i, bound = 0;
3455
3456 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3457 if (con_driver_map[i] == csw) {
3458 bound = 1;
3459 break;
3460 }
3461 }
3462
3463 return bound;
3464}
3465EXPORT_SYMBOL(con_is_bound);
3466
b45cfba4
JB		 3467/**
3468 * con_debug_enter - prepare the console for the kernel debugger
3469 * @sw: console driver
3470 *
3471 * Called when the console is taken over by the kernel debugger, this
3472 * function needs to save the current console state, then put the console
3473 * into a state suitable for the kernel debugger.
3474 *
3475 * RETURNS:
3476 * Zero on success, nonzero if a failure occurred when trying to prepare
3477 * the console for the debugger.
3478 */
3479int con_debug_enter(struct vc_data *vc)
3480{
3481 int ret = 0;
3482
3483 saved_fg_console = fg_console;
3484 saved_last_console = last_console;
3485 saved_want_console = want_console;
3486 saved_vc_mode = vc->vc_mode;
beed5336 3487 saved_console_blanked = console_blanked;
b45cfba4
JB		 3488 vc->vc_mode = KD_TEXT;
3489 console_blanked = 0;
3490 if (vc->vc_sw->con_debug_enter)
3491 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3492#ifdef CONFIG_KGDB_KDB
3493 /* Set the initial LINES variable if it is not already set */
3494 if (vc->vc_rows < 999) {
3495 int linecount;
3496 char lns[4];
3497 const char *setargs[3] = {
3498 "set",
3499 "LINES",
3500 lns,
3501 };
3502 if (kdbgetintenv(setargs[0], &linecount)) {
3503 snprintf(lns, 4, "%i", vc->vc_rows);
3504 kdb_set(2, setargs);
3505 }
3506 }
17b572e8
JW		 3507 if (vc->vc_cols < 999) {
3508 int colcount;
3509 char cols[4];
3510 const char *setargs[3] = {
3511 "set",
3512 "COLUMNS",
3513 cols,
3514 };
3515 if (kdbgetintenv(setargs[0], &colcount)) {
3516 snprintf(cols, 4, "%i", vc->vc_cols);
3517 kdb_set(2, setargs);
3518 }
3519 }
81d44507 3520#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3521 return ret;
3522}
3523EXPORT_SYMBOL_GPL(con_debug_enter);
3524
3525/**
3526 * con_debug_leave - restore console state
3527 * @sw: console driver
3528 *
3529 * Restore the console state to what it was before the kernel debugger
3530 * was invoked.
3531 *
3532 * RETURNS:
3533 * Zero on success, nonzero if a failure occurred when trying to restore
3534 * the console.
3535 */
3536int con_debug_leave(void)
3537{
3538 struct vc_data *vc;
3539 int ret = 0;
3540
3541 fg_console = saved_fg_console;
3542 last_console = saved_last_console;
3543 want_console = saved_want_console;
beed5336 3544 console_blanked = saved_console_blanked;
b45cfba4
JB		 3545 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3546
3547 vc = vc_cons[fg_console].d;
3548 if (vc->vc_sw->con_debug_leave)
3549 ret = vc->vc_sw->con_debug_leave(vc);
3550 return ret;
3551}
3552EXPORT_SYMBOL_GPL(con_debug_leave);
3553
50e244cc 3554static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 3555{
3556 struct module *owner = csw->owner;
3557 struct con_driver *con_driver;
3558 const char *desc;
96317e9e 3559 int i, retval;
3e795de7 3560
50e244cc
AC		 3561 WARN_CONSOLE_UNLOCKED();
3562
3e795de7
AD		 3563 if (!try_module_get(owner))
3564 return -ENODEV;
3565
3e795de7
AD		 3566 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3567 con_driver = &registered_con_driver[i];
3568
3569 /* already registered */
96317e9e 3570 if (con_driver->con == csw) {
c55c63c6 3571 retval = -EBUSY;
96317e9e
JS		 3572 goto err;
3573 }
3e795de7
AD		 3574 }
3575
3e795de7 3576 desc = csw->con_startup();
6798df4c
JS		 3577 if (!desc) {
3578 retval = -ENODEV;
3e795de7 3579 goto err;
6798df4c 3580 }
3e795de7
AD		 3581
3582 retval = -EINVAL;
3583
3584 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3585 con_driver = &registered_con_driver[i];
3586
d364b5c3
ID		 3587 if (con_driver->con == NULL &&
3588 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 3589 con_driver->con = csw;
3590 con_driver->desc = desc;
6db4063c
AD		 3591 con_driver->node = i;
3592 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3593 CON_DRIVER_FLAG_INIT;
3594 con_driver->first = first;
3595 con_driver->last = last;
3596 retval = 0;
3597 break;
3598 }
3599 }
3600
6db4063c
AD		 3601 if (retval)
3602 goto err;
3603
1083a7be
TI		 3604 con_driver->dev =
3605 device_create_with_groups(vtconsole_class, NULL,
3606 MKDEV(0, con_driver->node),
3607 con_driver, con_dev_groups,
3608 "vtcon%i", con_driver->node);
805952a8
GKH		 3609 if (IS_ERR(con_driver->dev)) {
3610 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3611 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3612 PTR_ERR(con_driver->dev));
3613 con_driver->dev = NULL;
6db4063c 3614 } else {
805952a8 3615 vtconsole_init_device(con_driver);
6db4063c 3616 }
928e964f 3617
3e795de7 3618err:
3e795de7
AD		 3619 module_put(owner);
3620 return retval;
3621}
50e244cc 3622
3e795de7
AD		 3623
3624/**
50539dd4 3625 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 3626 * @csw: console driver
3627 *
3628 * DESCRIPTION: All drivers that registers to the console layer must
3629 * call this function upon exit, or if the console driver is in a state
3630 * where it won't be able to handle console services, such as the
3631 * framebuffer console without loaded framebuffer drivers.
3632 *
3633 * The driver must unbind first prior to unregistration.
3634 */
e93a9a86
TI		 3635int do_unregister_con_driver(const struct consw *csw)
3636{
d9c660e7 3637 int i;
3e795de7
AD		 3638
3639 /* cannot unregister a bound driver */
3640 if (con_is_bound(csw))
d9c660e7
DV		 3641 return -EBUSY;
3642
3643 if (csw == conswitchp)
3644 return -EINVAL;
3e795de7
AD		 3645
3646 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3647 struct con_driver *con_driver = &registered_con_driver[i];
3648
2cf30f75 3649 if (con_driver->con == csw) {
d364b5c3
ID		 3650 /*
3651 * Defer the removal of the sysfs entries since that
3652 * will acquire the kernfs s_active lock and we can't
3653 * acquire this lock while holding the console lock:
3654 * the unbind sysfs entry imposes already the opposite
3655 * order. Reset con already here to prevent any later
3656 * lookup to succeed and mark this slot as zombie, so
3657 * it won't get reused until we complete the removal
3658 * in the deferred work.
3659 */
3e795de7 3660 con_driver->con = NULL;
d364b5c3
ID		 3661 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3662 schedule_work(&con_driver_unregister_work);
3663
d9c660e7 3664 return 0;
3e795de7
AD		 3665 }
3666 }
d9c660e7
DV		 3667
3668 return -ENODEV;
3e795de7 3669}
e93a9a86 3670EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 3671
d364b5c3
ID		 3672static void con_driver_unregister_callback(struct work_struct *ignored)
3673{
3674 int i;
3675
3676 console_lock();
3677
3678 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3679 struct con_driver *con_driver = &registered_con_driver[i];
3680
3681 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3682 continue;
3683
3684 console_unlock();
3685
3686 vtconsole_deinit_device(con_driver);
3687 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3688
3689 console_lock();
3690
3691 if (WARN_ON_ONCE(con_driver->con))
3692 con_driver->con = NULL;
3693 con_driver->desc = NULL;
3694 con_driver->dev = NULL;
3695 con_driver->node = 0;
3696 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3697 con_driver->flag = 0;
3698 con_driver->first = 0;
3699 con_driver->last = 0;
3700 }
3701
3702 console_unlock();
3703}
3704
3e795de7
AD		 3705/*
3706 * If we support more console drivers, this function is used
3707 * when a driver wants to take over some existing consoles
3708 * and become default driver for newly opened ones.
3709 *
155957f5 3710 * do_take_over_console is basically a register followed by unbind
50e244cc
AC		 3711 */
3712int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3713{
3714 int err;
3715
3716 err = do_register_con_driver(csw, first, last);
3717 /*
3718 * If we get an busy error we still want to bind the console driver
3719 * and return success, as we may have unbound the console driver
3720 * but not unregistered it.
3721 */
3722 if (err == -EBUSY)
3723 err = 0;
3724 if (!err)
3725 do_bind_con_driver(csw, first, last, deflt);
3726
3727 return err;
3728}
3729EXPORT_SYMBOL_GPL(do_take_over_console);
3730
3e795de7
AD		 3731
3732/*
3733 * give_up_console is a wrapper to unregister_con_driver. It will only
3734 * work if driver is fully unbound.
3735 */
3736void give_up_console(const struct consw *csw)
3737{
70125e76
WY		 3738 console_lock();
3739 do_unregister_con_driver(csw);
3740 console_unlock();
3e795de7
AD		 3741}
3742
6db4063c 3743static int __init vtconsole_class_init(void)
3e795de7 3744{
6db4063c 3745 int i;
3e795de7 3746
6db4063c
AD		 3747 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3748 if (IS_ERR(vtconsole_class)) {
3749 printk(KERN_WARNING "Unable to create vt console class; "
3750 "errno = %ld\n", PTR_ERR(vtconsole_class));
3751 vtconsole_class = NULL;
3752 }
3e795de7 3753
6db4063c 3754 /* Add system drivers to sysfs */
3e795de7
AD		 3755 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3756 struct con_driver *con = &registered_con_driver[i];
3757
805952a8 3758 if (con->con && !con->dev) {
1083a7be
TI		 3759 con->dev =
3760 device_create_with_groups(vtconsole_class, NULL,
3761 MKDEV(0, con->node),
3762 con, con_dev_groups,
3763 "vtcon%i", con->node);
6db4063c 3764
805952a8 3765 if (IS_ERR(con->dev)) {
6db4063c 3766 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3767 "device for %s; errno = %ld\n",
3768 con->desc, PTR_ERR(con->dev));
3769 con->dev = NULL;
6db4063c 3770 } else {
805952a8 3771 vtconsole_init_device(con);
6db4063c 3772 }
3e795de7 3773 }
3e795de7
AD		 3774 }
3775
3e795de7
AD		 3776 return 0;
3777}
6db4063c 3778postcore_initcall(vtconsole_class_init);
3e795de7 3779
1da177e4
LT		 3780#endif
3781
3782/*
3783 * Screen blanking
3784 */
3785
403aac96 3786static int set_vesa_blanking(char __user *p)
1da177e4 3787{
403aac96
YY		 3788 unsigned int mode;
3789
3790 if (get_user(mode, p + 1))
3791 return -EFAULT;
3792
3793 vesa_blank_mode = (mode < 4) ? mode : 0;
3794 return 0;
1da177e4
LT		 3795}
3796
1da177e4
LT		 3797void do_blank_screen(int entering_gfx)
3798{
3799 struct vc_data *vc = vc_cons[fg_console].d;
3800 int i;
3801
3802 WARN_CONSOLE_UNLOCKED();
3803
3804 if (console_blanked) {
3805 if (blank_state == blank_vesa_wait) {
3806 blank_state = blank_off;
d060a321 3807 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3808 }
3809 return;
3810 }
1da177e4
LT		 3811
3812 /* entering graphics mode? */
3813 if (entering_gfx) {
3814 hide_cursor(vc);
3815 save_screen(vc);
3816 vc->vc_sw->con_blank(vc, -1, 1);
3817 console_blanked = fg_console + 1;
b6e8f00f 3818 blank_state = blank_off;
1da177e4
LT		 3819 set_origin(vc);
3820 return;
3821 }
3822
b6e8f00f 3823 if (blank_state != blank_normal_wait)
3824 return;
3825 blank_state = blank_off;
3826
1da177e4
LT		 3827 /* don't blank graphics */
3828 if (vc->vc_mode != KD_TEXT) {
3829 console_blanked = fg_console + 1;
3830 return;
3831 }
3832
3833 hide_cursor(vc);
3834 del_timer_sync(&console_timer);
3835 blank_timer_expired = 0;
3836
3837 save_screen(vc);
3838 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3839 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3840 console_blanked = fg_console + 1;
3841 if (i)
3842 set_origin(vc);
3843
3844 if (console_blank_hook && console_blank_hook(1))
3845 return;
3846
d060a321 3847 if (vesa_off_interval && vesa_blank_mode) {
030babac 3848 blank_state = blank_vesa_wait;
1da177e4
LT		 3849 mod_timer(&console_timer, jiffies + vesa_off_interval);
3850 }
8b92e87d 3851 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3852}
3853EXPORT_SYMBOL(do_blank_screen);
3854
3855/*
3856 * Called by timer as well as from vt_console_driver
3857 */
3858void do_unblank_screen(int leaving_gfx)
3859{
3860 struct vc_data *vc;
3861
3862 /* This should now always be called from a "sane" (read: can schedule)
3863 * context for the sake of the low level drivers, except in the special
3864 * case of oops_in_progress
3865 */
3866 if (!oops_in_progress)
3867 might_sleep();
3868
3869 WARN_CONSOLE_UNLOCKED();
3870
3871 ignore_poke = 0;
3872 if (!console_blanked)
3873 return;
3874 if (!vc_cons_allocated(fg_console)) {
3875 /* impossible */
e620e548
JP		 3876 pr_warn("unblank_screen: tty %d not allocated ??\n",
3877 fg_console + 1);
1da177e4
LT		 3878 return;
3879 }
3880 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3881 /* Try to unblank in oops case too */
3882 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3883 return; /* but leave console_blanked != 0 */
3884
3885 if (blankinterval) {
f324edc8 3886 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3887 blank_state = blank_normal_wait;
3888 }
3889
3890 console_blanked = 0;
8fd4bd22 3891 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3892 /* Low-level driver cannot restore -> do it ourselves */
3893 update_screen(vc);
3894 if (console_blank_hook)
3895 console_blank_hook(0);
3896 set_palette(vc);
3897 set_cursor(vc);
8b92e87d 3898 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3899}
3900EXPORT_SYMBOL(do_unblank_screen);
3901
3902/*
3903 * This is called by the outside world to cause a forced unblank, mostly for
3904 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3905 * call it with 1 as an argument and so force a mode restore... that may kill
3906 * X or at least garbage the screen but would also make the Oops visible...
3907 */
3908void unblank_screen(void)
3909{
3910 do_unblank_screen(0);
3911}
3912
3913/*
70522e12 3914 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3915 * (console operations can still happen at irq time, but only from printk which
70522e12 3916 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3917 */
3918static void blank_screen_t(unsigned long dummy)
3919{
cc63b1e1 3920 if (unlikely(!keventd_up())) {
f324edc8 3921 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3922 return;
3923 }
1da177e4
LT		 3924 blank_timer_expired = 1;
3925 schedule_work(&console_work);
3926}
3927
3928void poke_blanked_console(void)
3929{
3930 WARN_CONSOLE_UNLOCKED();
3931
3932 /* Add this so we quickly catch whoever might call us in a non
3933 * safe context. Nowadays, unblank_screen() isn't to be called in
3934 * atomic contexts and is allowed to schedule (with the special case
3935 * of oops_in_progress, but that isn't of any concern for this
3936 * function. --BenH.
3937 */
3938 might_sleep();
3939
3940 /* This isn't perfectly race free, but a race here would be mostly harmless,
3941 * at worse, we'll do a spurrious blank and it's unlikely
3942 */
3943 del_timer(&console_timer);
3944 blank_timer_expired = 0;
3945
3946 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3947 return;
3948 if (console_blanked)
3949 unblank_screen();
3950 else if (blankinterval) {
f324edc8 3951 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3952 blank_state = blank_normal_wait;
3953 }
3954}
3955
3956/*
3957 * Palettes
3958 */
3959
3960static void set_palette(struct vc_data *vc)
3961{
3962 WARN_CONSOLE_UNLOCKED();
3963
709280da 3964 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
1da177e4
LT		 3965 vc->vc_sw->con_set_palette(vc, color_table);
3966}
3967
1da177e4
LT		 3968/*
3969 * Load palette into the DAC registers. arg points to a colour
3970 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3971 */
3972
3973int con_set_cmap(unsigned char __user *arg)
3974{
871bdea6
MG		 3975 int i, j, k;
3976 unsigned char colormap[3*16];
3977
3978 if (copy_from_user(colormap, arg, sizeof(colormap)))
3979 return -EFAULT;
1da177e4 3980
ac751efa 3981 console_lock();
871bdea6
MG		 3982 for (i = k = 0; i < 16; i++) {
3983 default_red[i] = colormap[k++];
3984 default_grn[i] = colormap[k++];
3985 default_blu[i] = colormap[k++];
3986 }
3987 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3988 if (!vc_cons_allocated(i))
3989 continue;
3990 for (j = k = 0; j < 16; j++) {
3991 vc_cons[i].d->vc_palette[k++] = default_red[j];
3992 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3993 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3994 }
3995 set_palette(vc_cons[i].d);
3996 }
ac751efa 3997 console_unlock();
1da177e4 3998
871bdea6 3999 return 0;
1da177e4
LT		 4000}
4001
4002int con_get_cmap(unsigned char __user *arg)
4003{
871bdea6
MG		 4004 int i, k;
4005 unsigned char colormap[3*16];
1da177e4 4006
ac751efa 4007 console_lock();
871bdea6
MG		 4008 for (i = k = 0; i < 16; i++) {
4009 colormap[k++] = default_red[i];
4010 colormap[k++] = default_grn[i];
4011 colormap[k++] = default_blu[i];
4012 }
ac751efa 4013 console_unlock();
1da177e4 4014
871bdea6
MG		 4015 if (copy_to_user(arg, colormap, sizeof(colormap)))
4016 return -EFAULT;
4017
4018 return 0;
1da177e4
LT		 4019}
4020
4021void reset_palette(struct vc_data *vc)
4022{
4023 int j, k;
4024 for (j=k=0; j<16; j++) {
4025 vc->vc_palette[k++] = default_red[j];
4026 vc->vc_palette[k++] = default_grn[j];
4027 vc->vc_palette[k++] = default_blu[j];
4028 }
4029 set_palette(vc);
4030}
4031
4032/*
4033 * Font switching
4034 *
4035 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4036 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4037 * depending on width) reserved for each character which is kinda wasty, but
4038 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4039 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4040 * format (maybe we should add a `fontoffset' field to the `display'
4041 * structure so we won't have to convert the fontdata all the time.
4042 * /Jes
4043 */
4044
4045#define max_font_size 65536
4046
4047static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4048{
4049 struct console_font font;
4050 int rc = -EINVAL;
4051 int c;
4052
1da177e4
LT		 4053 if (op->data) {
4054 font.data = kmalloc(max_font_size, GFP_KERNEL);
4055 if (!font.data)
4056 return -ENOMEM;
4057 } else
4058 font.data = NULL;
4059
ac751efa 4060 console_lock();
edab558f
AC		 4061 if (vc->vc_mode != KD_TEXT)
4062 rc = -EINVAL;
4063 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4064 rc = vc->vc_sw->con_font_get(vc, &font);
4065 else
4066 rc = -ENOSYS;
ac751efa 4067 console_unlock();
1da177e4
LT		 4068
4069 if (rc)
4070 goto out;
4071
4072 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4073
1da177e4
LT		 4074 if (op->data && font.charcount > op->charcount)
4075 rc = -ENOSPC;
4076 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4077 if (font.width > op->width || font.height > op->height)
4078 rc = -ENOSPC;
4079 } else {
4080 if (font.width != 8)
4081 rc = -EIO;
4082 else if ((op->height && font.height > op->height) ||
4083 font.height > 32)
4084 rc = -ENOSPC;
4085 }
4086 if (rc)
4087 goto out;
4088
4089 op->height = font.height;
4090 op->width = font.width;
4091 op->charcount = font.charcount;
4092
4093 if (op->data && copy_to_user(op->data, font.data, c))
4094 rc = -EFAULT;
4095
4096out:
4097 kfree(font.data);
4098 return rc;
4099}
4100
4101static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4102{
4103 struct console_font font;
4104 int rc = -EINVAL;
4105 int size;
4106
4107 if (vc->vc_mode != KD_TEXT)
4108 return -EINVAL;
4109 if (!op->data)
4110 return -EINVAL;
4111 if (op->charcount > 512)
4112 return -EINVAL;
4113 if (!op->height) { /* Need to guess font height [compat] */
4114 int h, i;
4115 u8 __user *charmap = op->data;
4116 u8 tmp;
4117
4118 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4119 so that we can get rid of this soon */
4120 if (!(op->flags & KD_FONT_FLAG_OLD))
4121 return -EINVAL;
4122 for (h = 32; h > 0; h--)
4123 for (i = 0; i < op->charcount; i++) {
4124 if (get_user(tmp, &charmap[32*i+h-1]))
4125 return -EFAULT;
4126 if (tmp)
4127 goto nonzero;
4128 }
4129 return -EINVAL;
4130 nonzero:
4131 op->height = h;
4132 }
4133 if (op->width <= 0 || op->width > 32 || op->height > 32)
4134 return -EINVAL;
4135 size = (op->width+7)/8 * 32 * op->charcount;
4136 if (size > max_font_size)
4137 return -ENOSPC;
4138 font.charcount = op->charcount;
4139 font.height = op->height;
4140 font.width = op->width;
9b71ca20
JL		 4141 font.data = memdup_user(op->data, size);
4142 if (IS_ERR(font.data))
4143 return PTR_ERR(font.data);
ac751efa 4144 console_lock();
edab558f
AC		 4145 if (vc->vc_mode != KD_TEXT)
4146 rc = -EINVAL;
4147 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4148 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4149 else
4150 rc = -ENOSYS;
ac751efa 4151 console_unlock();
1da177e4
LT		 4152 kfree(font.data);
4153 return rc;
4154}
4155
4156static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4157{
4158 struct console_font font = {.width = op->width, .height = op->height};
4159 char name[MAX_FONT_NAME];
4160 char *s = name;
4161 int rc;
4162
1da177e4
LT		 4163
4164 if (!op->data)
4165 s = NULL;
4166 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4167 return -EFAULT;
4168 else
4169 name[MAX_FONT_NAME - 1] = 0;
4170
ac751efa 4171 console_lock();
edab558f
AC		 4172 if (vc->vc_mode != KD_TEXT) {
4173 console_unlock();
4174 return -EINVAL;
4175 }
1da177e4
LT		 4176 if (vc->vc_sw->con_font_default)
4177 rc = vc->vc_sw->con_font_default(vc, &font, s);
4178 else
4179 rc = -ENOSYS;
ac751efa 4180 console_unlock();
1da177e4
LT		 4181 if (!rc) {
4182 op->width = font.width;
4183 op->height = font.height;
4184 }
4185 return rc;
4186}
4187
4188static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4189{
4190 int con = op->height;
4191 int rc;
4192
1da177e4 4193
ac751efa 4194 console_lock();
edab558f
AC		 4195 if (vc->vc_mode != KD_TEXT)
4196 rc = -EINVAL;
4197 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4198 rc = -ENOSYS;
4199 else if (con < 0 || !vc_cons_allocated(con))
4200 rc = -ENOTTY;
4201 else if (con == vc->vc_num) /* nothing to do */
4202 rc = 0;
4203 else
4204 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4205 console_unlock();
1da177e4
LT		 4206 return rc;
4207}
4208
4209int con_font_op(struct vc_data *vc, struct console_font_op *op)
4210{
4211 switch (op->op) {
4212 case KD_FONT_OP_SET:
4213 return con_font_set(vc, op);
4214 case KD_FONT_OP_GET:
4215 return con_font_get(vc, op);
4216 case KD_FONT_OP_SET_DEFAULT:
4217 return con_font_default(vc, op);
4218 case KD_FONT_OP_COPY:
4219 return con_font_copy(vc, op);
4220 }
4221 return -ENOSYS;
4222}
4223
4224/*
4225 * Interface exported to selection and vcs.
4226 */
4227
4228/* used by selection */
4229u16 screen_glyph(struct vc_data *vc, int offset)
4230{
4231 u16 w = scr_readw(screenpos(vc, offset, 1));
4232 u16 c = w & 0xff;
4233
4234 if (w & vc->vc_hi_font_mask)
4235 c |= 0x100;
4236 return c;
4237}
f7511d5f 4238EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4239
4240/* used by vcs - note the word offset */
4241unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4242{
4243 return screenpos(vc, 2 * w_offset, viewed);
4244}
88867e3d 4245EXPORT_SYMBOL_GPL(screen_pos);
1da177e4
LT		 4246
4247void getconsxy(struct vc_data *vc, unsigned char *p)
4248{
4249 p[0] = vc->vc_x;
4250 p[1] = vc->vc_y;
4251}
4252
4253void putconsxy(struct vc_data *vc, unsigned char *p)
4254{
9477e260 4255 hide_cursor(vc);
1da177e4
LT		 4256 gotoxy(vc, p[0], p[1]);
4257 set_cursor(vc);
4258}
4259
4260u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4261{
4262 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4263 return softcursor_original;
4264 return scr_readw(org);
4265}
4266
4267void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4268{
4269 scr_writew(val, org);
4270 if ((unsigned long)org == vc->vc_pos) {
4271 softcursor_original = -1;
4272 add_softcursor(vc);
4273 }
4274}
4275
432c9ed2
NP		 4276void vcs_scr_updated(struct vc_data *vc)
4277{
4278 notify_update(vc);
4279}
4280
1da177e4
LT		 4281/*
4282 * Visible symbols for modules
4283 */
4284
4285EXPORT_SYMBOL(color_table);
4286EXPORT_SYMBOL(default_red);
4287EXPORT_SYMBOL(default_grn);
4288EXPORT_SYMBOL(default_blu);
4289EXPORT_SYMBOL(update_region);
4290EXPORT_SYMBOL(redraw_screen);
4291EXPORT_SYMBOL(vc_resize);
4292EXPORT_SYMBOL(fg_console);
4293EXPORT_SYMBOL(console_blank_hook);
4294EXPORT_SYMBOL(console_blanked);
4295EXPORT_SYMBOL(vc_cons);
f6c06b68 4296EXPORT_SYMBOL(global_cursor_default);
1da177e4 4297#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4298EXPORT_SYMBOL(give_up_console);
4299#endif
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