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vt: fix console lock vs. kernfs s_active lock order
[mirror_ubuntu-artful-kernel.git] / drivers / tty / vt / vt.c
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1da177e4 1/*
1da177e4
LT		 2 * Copyright (C) 1991, 1992 Linus Torvalds
3 */
4
5/*
6 * Hopefully this will be a rather complete VT102 implementation.
7 *
8 * Beeping thanks to John T Kohl.
9 *
10 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
11 * Chars, and VT100 enhancements by Peter MacDonald.
12 *
13 * Copy and paste function by Andrew Haylett,
14 * some enhancements by Alessandro Rubini.
15 *
16 * Code to check for different video-cards mostly by Galen Hunt,
17 * <g-hunt@ee.utah.edu>
18 *
19 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
20 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
21 *
22 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
23 * Resizing of consoles, aeb, 940926
24 *
25 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
26 * <poe@daimi.aau.dk>
27 *
28 * User-defined bell sound, new setterm control sequences and printk
29 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
30 *
31 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
32 *
33 * Merge with the abstract console driver by Geert Uytterhoeven
34 * <geert@linux-m68k.org>, Jan 1997.
35 *
36 * Original m68k console driver modifications by
37 *
38 * - Arno Griffioen <arno@usn.nl>
39 * - David Carter <carter@cs.bris.ac.uk>
40 *
41 * The abstract console driver provides a generic interface for a text
42 * console. It supports VGA text mode, frame buffer based graphical consoles
43 * and special graphics processors that are only accessible through some
44 * registers (e.g. a TMS340x0 GSP).
45 *
46 * The interface to the hardware is specified using a special structure
47 * (struct consw) which contains function pointers to console operations
48 * (see <linux/console.h> for more information).
49 *
50 * Support for changeable cursor shape
51 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
52 *
53 * Ported to i386 and con_scrolldelta fixed
54 * by Emmanuel Marty <core@ggi-project.org>, April 1998
55 *
56 * Resurrected character buffers in videoram plus lots of other trickery
57 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
58 *
59 * Removed old-style timers, introduced console_timer, made timer
e1f8e874 60 * deletion SMP-safe. 17Jun00, Andrew Morton
1da177e4
LT		 61 *
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
d4328b40
AT		 64 *
65 * Fixed UTF-8 mode so alternate charset modes always work according
66 * to control sequences interpreted in do_con_trol function
67 * preserving backward VT100 semigraphics compatibility,
68 * malformed UTF sequences represented as sequences of replacement glyphs,
69 * original codes or '?' as a last resort if replacement glyph is undefined
70 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
1da177e4
LT		 71 */
72
73#include <linux/module.h>
74#include <linux/types.h>
75#include <linux/sched.h>
76#include <linux/tty.h>
77#include <linux/tty_flip.h>
78#include <linux/kernel.h>
79#include <linux/string.h>
80#include <linux/errno.h>
81#include <linux/kd.h>
82#include <linux/slab.h>
83#include <linux/major.h>
84#include <linux/mm.h>
85#include <linux/console.h>
86#include <linux/init.h>
c831c338 87#include <linux/mutex.h>
1da177e4
LT		 88#include <linux/vt_kern.h>
89#include <linux/selection.h>
90#include <linux/tiocl.h>
91#include <linux/kbd_kern.h>
92#include <linux/consolemap.h>
93#include <linux/timer.h>
94#include <linux/interrupt.h>
1da177e4 95#include <linux/workqueue.h>
1da177e4
LT		 96#include <linux/pm.h>
97#include <linux/font.h>
98#include <linux/bitops.h>
b293d758 99#include <linux/notifier.h>
d81ed103
AC		 100#include <linux/device.h>
101#include <linux/io.h>
d81ed103 102#include <linux/uaccess.h>
81d44507 103#include <linux/kdb.h>
74c807ce 104#include <linux/ctype.h>
1da177e4 105
3e795de7 106#define MAX_NR_CON_DRIVER 16
1da177e4 107
6db4063c 108#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 109#define CON_DRIVER_FLAG_INIT 2
110#define CON_DRIVER_FLAG_ATTR 4
d364b5c3 111#define CON_DRIVER_FLAG_ZOMBIE 8
3e795de7
AD		 112
113struct con_driver {
114 const struct consw *con;
115 const char *desc;
805952a8 116 struct device *dev;
6db4063c 117 int node;
3e795de7
AD		 118 int first;
119 int last;
120 int flag;
121};
122
123static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 124const struct consw *conswitchp;
125
126/* A bitmap for codes <32. A bit of 1 indicates that the code
127 * corresponding to that bit number invokes some special action
128 * (such as cursor movement) and should not be displayed as a
129 * glyph unless the disp_ctrl mode is explicitly enabled.
130 */
131#define CTRL_ACTION 0x0d00ff81
132#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
133
134/*
135 * Here is the default bell parameters: 750HZ, 1/8th of a second
136 */
137#define DEFAULT_BELL_PITCH 750
138#define DEFAULT_BELL_DURATION (HZ/8)
bd63364c 139#define DEFAULT_CURSOR_BLINK_MS 200
1da177e4 140
1da177e4
LT		 141struct vc vc_cons [MAX_NR_CONSOLES];
142
143#ifndef VT_SINGLE_DRIVER
144static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145#endif
146
147static int con_open(struct tty_struct *, struct file *);
148static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151static void save_cur(struct vc_data *vc);
152static void reset_terminal(struct vc_data *vc, int do_clear);
153static void con_flush_chars(struct tty_struct *tty);
403aac96 154static int set_vesa_blanking(char __user *p);
1da177e4
LT		 155static void set_cursor(struct vc_data *vc);
156static void hide_cursor(struct vc_data *vc);
65f27f38 157static void console_callback(struct work_struct *ignored);
d364b5c3 158static void con_driver_unregister_callback(struct work_struct *ignored);
1da177e4
LT		 159static void blank_screen_t(unsigned long dummy);
160static void set_palette(struct vc_data *vc);
161
52c40fca
PH		 162#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
163
1da177e4 164static int printable; /* Is console ready for printing? */
77bf2bab 165int default_utf8 = true;
042f10ec 166module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 167int global_cursor_default = -1;
168module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 169
9ea9a886
CL		 170static int cur_default = CUR_DEFAULT;
171module_param(cur_default, int, S_IRUGO | S_IWUSR);
172
1da177e4
LT		 173/*
174 * ignore_poke: don't unblank the screen when things are typed. This is
175 * mainly for the privacy of braille terminal users.
176 */
177static int ignore_poke;
178
179int do_poke_blanked_console;
180int console_blanked;
181
182static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 183static int vesa_off_interval;
f324edc8
DM		 184static int blankinterval = 10*60;
185core_param(consoleblank, blankinterval, int, 0444);
1da177e4 186
65f27f38 187static DECLARE_WORK(console_work, console_callback);
d364b5c3 188static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
1da177e4
LT		 189
190/*
191 * fg_console is the current virtual console,
192 * last_console is the last used one,
193 * want_console is the console we want to switch to,
b45cfba4 194 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 195 */
196int fg_console;
197int last_console;
198int want_console = -1;
fed891c8
JW		 199static int saved_fg_console;
200static int saved_last_console;
201static int saved_want_console;
202static int saved_vc_mode;
beed5336 203static int saved_console_blanked;
1da177e4
LT		 204
205/*
206 * For each existing display, we have a pointer to console currently visible
207 * on that display, allowing consoles other than fg_console to be refreshed
208 * appropriately. Unless the low-level driver supplies its own display_fg
209 * variable, we use this one for the "master display".
210 */
211static struct vc_data *master_display_fg;
212
213/*
214 * Unfortunately, we need to delay tty echo when we're currently writing to the
215 * console since the code is (and always was) not re-entrant, so we schedule
216 * all flip requests to process context with schedule-task() and run it from
217 * console_callback().
218 */
219
220/*
221 * For the same reason, we defer scrollback to the console callback.
222 */
223static int scrollback_delta;
224
225/*
226 * Hook so that the power management routines can (un)blank
227 * the console on our behalf.
228 */
229int (*console_blank_hook)(int);
230
40565f19 231static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
1da177e4
LT		 232static int blank_state;
233static int blank_timer_expired;
234enum {
235 blank_off = 0,
236 blank_normal_wait,
237 blank_vesa_wait,
238};
239
fbc92a34
KS		 240/*
241 * /sys/class/tty/tty0/
242 *
243 * the attribute 'active' contains the name of the current vc
244 * console and it supports poll() to detect vc switches
245 */
246static struct device *tty0dev;
247
b293d758
ST		 248/*
249 * Notifier list for console events.
250 */
251static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
252
253int register_vt_notifier(struct notifier_block *nb)
254{
255 return atomic_notifier_chain_register(&vt_notifier_list, nb);
256}
257EXPORT_SYMBOL_GPL(register_vt_notifier);
258
259int unregister_vt_notifier(struct notifier_block *nb)
260{
261 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
262}
263EXPORT_SYMBOL_GPL(unregister_vt_notifier);
264
265static void notify_write(struct vc_data *vc, unsigned int unicode)
266{
502fcb79 267 struct vt_notifier_param param = { .vc = vc, .c = unicode };
b293d758
ST		 268 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
269}
270
271static void notify_update(struct vc_data *vc)
272{
273 struct vt_notifier_param param = { .vc = vc };
274 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
275}
1da177e4
LT		 276/*
277 * Low-Level Functions
278 */
279
280#define IS_FG(vc) ((vc)->vc_num == fg_console)
281
282#ifdef VT_BUF_VRAM_ONLY
283#define DO_UPDATE(vc) 0
284#else
f700d6e5 285#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
1da177e4
LT		 286#endif
287
288static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
289{
290 unsigned short *p;
291
292 if (!viewed)
293 p = (unsigned short *)(vc->vc_origin + offset);
294 else if (!vc->vc_sw->con_screen_pos)
295 p = (unsigned short *)(vc->vc_visible_origin + offset);
296 else
297 p = vc->vc_sw->con_screen_pos(vc, offset);
298 return p;
299}
300
e33ac1c1 301/* Called from the keyboard irq path.. */
1da177e4
LT		 302static inline void scrolldelta(int lines)
303{
e33ac1c1
AC		 304 /* FIXME */
305 /* scrolldelta needs some kind of consistency lock, but the BKL was
306 and still is not protecting versus the scheduled back end */
1da177e4
LT		 307 scrollback_delta += lines;
308 schedule_console_callback();
309}
310
311void schedule_console_callback(void)
312{
313 schedule_work(&console_work);
314}
315
316static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
317{
318 unsigned short *d, *s;
319
320 if (t+nr >= b)
321 nr = b - t - 1;
322 if (b > vc->vc_rows || t >= b || nr < 1)
323 return;
324 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
325 return;
326 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
327 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
328 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
386f40c8 329 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
1da177e4
LT		 330 vc->vc_size_row * nr);
331}
332
333static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
334{
335 unsigned short *s;
336 unsigned int step;
337
338 if (t+nr >= b)
339 nr = b - t - 1;
340 if (b > vc->vc_rows || t >= b || nr < 1)
341 return;
342 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
343 return;
344 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
345 step = vc->vc_cols * nr;
346 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
93f78da4 347 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
1da177e4
LT		 348}
349
350static void do_update_region(struct vc_data *vc, unsigned long start, int count)
351{
352#ifndef VT_BUF_VRAM_ONLY
353 unsigned int xx, yy, offset;
354 u16 *p;
355
356 p = (u16 *) start;
357 if (!vc->vc_sw->con_getxy) {
358 offset = (start - vc->vc_origin) / 2;
359 xx = offset % vc->vc_cols;
360 yy = offset / vc->vc_cols;
361 } else {
362 int nxx, nyy;
363 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
364 xx = nxx; yy = nyy;
365 }
366 for(;;) {
367 u16 attrib = scr_readw(p) & 0xff00;
368 int startx = xx;
369 u16 *q = p;
370 while (xx < vc->vc_cols && count) {
371 if (attrib != (scr_readw(p) & 0xff00)) {
372 if (p > q)
373 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
374 startx = xx;
375 q = p;
376 attrib = scr_readw(p) & 0xff00;
377 }
378 p++;
379 xx++;
380 count--;
381 }
382 if (p > q)
383 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
384 if (!count)
385 break;
386 xx = 0;
387 yy++;
388 if (vc->vc_sw->con_getxy) {
389 p = (u16 *)start;
390 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
391 }
392 }
393#endif
394}
395
396void update_region(struct vc_data *vc, unsigned long start, int count)
397{
398 WARN_CONSOLE_UNLOCKED();
399
400 if (DO_UPDATE(vc)) {
401 hide_cursor(vc);
402 do_update_region(vc, start, count);
403 set_cursor(vc);
404 }
405}
406
407/* Structure of attributes is hardware-dependent */
408
fa6ce9ab
JE		 409static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
410 u8 _underline, u8 _reverse, u8 _italic)
1da177e4
LT		 411{
412 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 413 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
414 _blink, _underline, _reverse, _italic);
1da177e4
LT		 415
416#ifndef VT_BUF_VRAM_ONLY
417/*
418 * ++roman: I completely changed the attribute format for monochrome
419 * mode (!can_do_color). The formerly used MDA (monochrome display
420 * adapter) format didn't allow the combination of certain effects.
421 * Now the attribute is just a bit vector:
422 * Bit 0..1: intensity (0..2)
423 * Bit 2 : underline
424 * Bit 3 : reverse
425 * Bit 7 : blink
426 */
427 {
c9e587ab 428 u8 a = _color;
1da177e4
LT		 429 if (!vc->vc_can_do_color)
430 return _intensity |
fa6ce9ab 431 (_italic ? 2 : 0) |
1da177e4
LT		 432 (_underline ? 4 : 0) |
433 (_reverse ? 8 : 0) |
434 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 435 if (_italic)
436 a = (a & 0xF0) | vc->vc_itcolor;
437 else if (_underline)
1da177e4
LT		 438 a = (a & 0xf0) | vc->vc_ulcolor;
439 else if (_intensity == 0)
440 a = (a & 0xf0) | vc->vc_ulcolor;
441 if (_reverse)
442 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
443 if (_blink)
444 a ^= 0x80;
445 if (_intensity == 2)
446 a ^= 0x08;
447 if (vc->vc_hi_font_mask == 0x100)
448 a <<= 1;
449 return a;
450 }
451#else
452 return 0;
453#endif
454}
455
456static void update_attr(struct vc_data *vc)
457{
fa6ce9ab
JE		 458 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
459 vc->vc_blink, vc->vc_underline,
460 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
461 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 462}
463
464/* Note: inverting the screen twice should revert to the original state */
465void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
466{
467 unsigned short *p;
468
469 WARN_CONSOLE_UNLOCKED();
470
471 count /= 2;
472 p = screenpos(vc, offset, viewed);
473 if (vc->vc_sw->con_invert_region)
474 vc->vc_sw->con_invert_region(vc, p, count);
475#ifndef VT_BUF_VRAM_ONLY
476 else {
477 u16 *q = p;
478 int cnt = count;
479 u16 a;
480
481 if (!vc->vc_can_do_color) {
482 while (cnt--) {
483 a = scr_readw(q);
484 a ^= 0x0800;
485 scr_writew(a, q);
486 q++;
487 }
488 } else if (vc->vc_hi_font_mask == 0x100) {
489 while (cnt--) {
490 a = scr_readw(q);
491 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
492 scr_writew(a, q);
493 q++;
494 }
495 } else {
496 while (cnt--) {
497 a = scr_readw(q);
498 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
499 scr_writew(a, q);
500 q++;
501 }
502 }
503 }
504#endif
505 if (DO_UPDATE(vc))
506 do_update_region(vc, (unsigned long) p, count);
19e3ae6b 507 notify_update(vc);
1da177e4
LT		 508}
509
510/* used by selection: complement pointer position */
511void complement_pos(struct vc_data *vc, int offset)
512{
414edcd3 513 static int old_offset = -1;
1da177e4
LT		 514 static unsigned short old;
515 static unsigned short oldx, oldy;
516
517 WARN_CONSOLE_UNLOCKED();
518
414edcd3
AD		 519 if (old_offset != -1 && old_offset >= 0 &&
520 old_offset < vc->vc_screenbuf_size) {
521 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 522 if (DO_UPDATE(vc))
523 vc->vc_sw->con_putc(vc, old, oldy, oldx);
19e3ae6b 524 notify_update(vc);
1da177e4 525 }
414edcd3
AD		 526
527 old_offset = offset;
528
529 if (offset != -1 && offset >= 0 &&
530 offset < vc->vc_screenbuf_size) {
1da177e4 531 unsigned short new;
414edcd3 532 unsigned short *p;
1da177e4
LT		 533 p = screenpos(vc, offset, 1);
534 old = scr_readw(p);
535 new = old ^ vc->vc_complement_mask;
536 scr_writew(new, p);
537 if (DO_UPDATE(vc)) {
538 oldx = (offset >> 1) % vc->vc_cols;
539 oldy = (offset >> 1) / vc->vc_cols;
540 vc->vc_sw->con_putc(vc, new, oldy, oldx);
541 }
19e3ae6b 542 notify_update(vc);
1da177e4
LT		 543 }
544}
545
546static void insert_char(struct vc_data *vc, unsigned int nr)
547{
81732c3b 548 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 549
a883b70d 550 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b 551 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
1da177e4 552 vc->vc_need_wrap = 0;
81732c3b
JFM		 553 if (DO_UPDATE(vc))
554 do_update_region(vc, (unsigned long) p,
b1a925f4 555 vc->vc_cols - vc->vc_x);
1da177e4
LT		 556}
557
558static void delete_char(struct vc_data *vc, unsigned int nr)
559{
81732c3b 560 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 561
b1a925f4 562 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b
JFM		 563 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
564 nr * 2);
1da177e4 565 vc->vc_need_wrap = 0;
81732c3b
JFM		 566 if (DO_UPDATE(vc))
567 do_update_region(vc, (unsigned long) p,
b1a925f4 568 vc->vc_cols - vc->vc_x);
1da177e4
LT		 569}
570
571static int softcursor_original;
572
573static void add_softcursor(struct vc_data *vc)
574{
575 int i = scr_readw((u16 *) vc->vc_pos);
576 u32 type = vc->vc_cursor_type;
577
578 if (! (type & 0x10)) return;
579 if (softcursor_original != -1) return;
580 softcursor_original = i;
581 i |= ((type >> 8) & 0xff00 );
582 i ^= ((type) & 0xff00 );
583 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
584 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
585 scr_writew(i, (u16 *) vc->vc_pos);
586 if (DO_UPDATE(vc))
587 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
588}
589
590static void hide_softcursor(struct vc_data *vc)
591{
592 if (softcursor_original != -1) {
593 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
594 if (DO_UPDATE(vc))
595 vc->vc_sw->con_putc(vc, softcursor_original,
596 vc->vc_y, vc->vc_x);
597 softcursor_original = -1;
598 }
599}
600
601static void hide_cursor(struct vc_data *vc)
602{
603 if (vc == sel_cons)
604 clear_selection();
605 vc->vc_sw->con_cursor(vc, CM_ERASE);
606 hide_softcursor(vc);
607}
608
609static void set_cursor(struct vc_data *vc)
610{
611 if (!IS_FG(vc) || console_blanked ||
612 vc->vc_mode == KD_GRAPHICS)
613 return;
614 if (vc->vc_deccm) {
615 if (vc == sel_cons)
616 clear_selection();
617 add_softcursor(vc);
618 if ((vc->vc_cursor_type & 0x0f) != 1)
619 vc->vc_sw->con_cursor(vc, CM_DRAW);
620 } else
621 hide_cursor(vc);
622}
623
624static void set_origin(struct vc_data *vc)
625{
626 WARN_CONSOLE_UNLOCKED();
627
628 if (!CON_IS_VISIBLE(vc) ||
629 !vc->vc_sw->con_set_origin ||
630 !vc->vc_sw->con_set_origin(vc))
631 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
632 vc->vc_visible_origin = vc->vc_origin;
633 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
634 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
635}
636
637static inline void save_screen(struct vc_data *vc)
638{
639 WARN_CONSOLE_UNLOCKED();
640
641 if (vc->vc_sw->con_save_screen)
642 vc->vc_sw->con_save_screen(vc);
643}
644
645/*
646 * Redrawing of screen
647 */
648
2a248307 649void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 650{
651 unsigned short *p = (unsigned short *)vc->vc_origin;
652 int count = vc->vc_screenbuf_size / 2;
653 int mask = vc->vc_hi_font_mask | 0xff;
654
655 for (; count > 0; count--, p++) {
656 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
657 }
658}
659
660void redraw_screen(struct vc_data *vc, int is_switch)
661{
662 int redraw = 0;
663
664 WARN_CONSOLE_UNLOCKED();
665
666 if (!vc) {
667 /* strange ... */
668 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
669 return;
670 }
671
672 if (is_switch) {
673 struct vc_data *old_vc = vc_cons[fg_console].d;
674 if (old_vc == vc)
675 return;
676 if (!CON_IS_VISIBLE(vc))
677 redraw = 1;
678 *vc->vc_display_fg = vc;
679 fg_console = vc->vc_num;
680 hide_cursor(old_vc);
681 if (!CON_IS_VISIBLE(old_vc)) {
682 save_screen(old_vc);
683 set_origin(old_vc);
684 }
fbc92a34
KS		 685 if (tty0dev)
686 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 687 } else {
688 hide_cursor(vc);
689 redraw = 1;
690 }
691
692 if (redraw) {
693 int update;
694 int old_was_color = vc->vc_can_do_color;
695
696 set_origin(vc);
697 update = vc->vc_sw->con_switch(vc);
698 set_palette(vc);
699 /*
700 * If console changed from mono<->color, the best we can do
701 * is to clear the buffer attributes. As it currently stands,
702 * rebuilding new attributes from the old buffer is not doable
703 * without overly complex code.
704 */
705 if (old_was_color != vc->vc_can_do_color) {
706 update_attr(vc);
707 clear_buffer_attributes(vc);
708 }
8fd4bd22
JB		 709
710 /* Forcibly update if we're panicing */
711 if ((update && vc->vc_mode != KD_GRAPHICS) ||
712 vt_force_oops_output(vc))
1da177e4
LT		 713 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
714 }
715 set_cursor(vc);
716 if (is_switch) {
717 set_leds();
718 compute_shiftstate();
8182ec49 719 notify_update(vc);
1da177e4
LT		 720 }
721}
722
723/*
724 * Allocation, freeing and resizing of VTs.
725 */
726
727int vc_cons_allocated(unsigned int i)
728{
729 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
730}
731
732static void visual_init(struct vc_data *vc, int num, int init)
733{
734 /* ++Geert: vc->vc_sw->con_init determines console size */
735 if (vc->vc_sw)
736 module_put(vc->vc_sw->owner);
737 vc->vc_sw = conswitchp;
738#ifndef VT_SINGLE_DRIVER
739 if (con_driver_map[num])
740 vc->vc_sw = con_driver_map[num];
741#endif
742 __module_get(vc->vc_sw->owner);
743 vc->vc_num = num;
744 vc->vc_display_fg = &master_display_fg;
745 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
e4bdab70 746 vc->vc_uni_pagedir = NULL;
1da177e4
LT		 747 vc->vc_hi_font_mask = 0;
748 vc->vc_complement_mask = 0;
749 vc->vc_can_do_color = 0;
8fd4bd22 750 vc->vc_panic_force_write = false;
1da177e4
LT		 751 vc->vc_sw->con_init(vc, init);
752 if (!vc->vc_complement_mask)
753 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
754 vc->vc_s_complement_mask = vc->vc_complement_mask;
755 vc->vc_size_row = vc->vc_cols << 1;
756 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
757}
758
759int vc_allocate(unsigned int currcons) /* return 0 on success */
760{
761 WARN_CONSOLE_UNLOCKED();
762
763 if (currcons >= MAX_NR_CONSOLES)
764 return -ENXIO;
765 if (!vc_cons[currcons].d) {
766 struct vc_data *vc;
b293d758 767 struct vt_notifier_param param;
1da177e4
LT		 768
769 /* prevent users from taking too much memory */
770 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
771 return -EPERM;
772
773 /* due to the granularity of kmalloc, we waste some memory here */
774 /* the alloc is done in two steps, to optimize the common situation
775 of a 25x80 console (structsize=216, screenbuf_size=4000) */
776 /* although the numbers above are not valid since long ago, the
777 point is still up-to-date and the comment still has its value
778 even if only as a historical artifact. --mj, July 1998 */
b293d758 779 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1da177e4
LT		 780 if (!vc)
781 return -ENOMEM;
1da177e4 782 vc_cons[currcons].d = vc;
ff917ba4 783 tty_port_init(&vc->port);
c2c88f10 784 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 785 visual_init(vc, currcons, 1);
786 if (!*vc->vc_uni_pagedir_loc)
787 con_set_default_unimap(vc);
5c9228f0 788 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1da177e4
LT		 789 if (!vc->vc_screenbuf) {
790 kfree(vc);
791 vc_cons[currcons].d = NULL;
792 return -ENOMEM;
793 }
f6c06b68
MG		 794
795 /* If no drivers have overridden us and the user didn't pass a
796 boot option, default to displaying the cursor */
797 if (global_cursor_default == -1)
798 global_cursor_default = 1;
799
1da177e4 800 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
4995f8ef 801 vcs_make_sysfs(currcons);
b293d758 802 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1da177e4
LT		 803 }
804 return 0;
805}
806
e400b6ec
AD		 807static inline int resize_screen(struct vc_data *vc, int width, int height,
808 int user)
1da177e4
LT		 809{
810 /* Resizes the resolution of the display adapater */
811 int err = 0;
812
813 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 814 err = vc->vc_sw->con_resize(vc, width, height, user);
815
1da177e4
LT		 816 return err;
817}
818
819/*
820 * Change # of rows and columns (0 means unchanged/the size of fg_console)
821 * [this is to be used together with some user program
822 * like resize that changes the hardware videomode]
823 */
824#define VC_RESIZE_MAXCOL (32767)
825#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 826
827/**
828 * vc_do_resize - resizing method for the tty
829 * @tty: tty being resized
830 * @real_tty: real tty (different to tty if a pty/tty pair)
831 * @vc: virtual console private data
832 * @cols: columns
833 * @lines: lines
834 *
835 * Resize a virtual console, clipping according to the actual constraints.
836 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 837 * information and perform any necessary signal handling.
8c9a9dd0 838 *
6a1c0680 839 * Caller must hold the console semaphore. Takes the termios rwsem and
8c9a9dd0
AC		 840 * ctrl_lock of the tty IFF a tty is passed.
841 */
842
fc6f6238
AC		 843static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
844 unsigned int cols, unsigned int lines)
1da177e4
LT		 845{
846 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 847 unsigned long end;
f2ee4ae8 848 unsigned int old_rows, old_row_size;
1da177e4 849 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 850 unsigned int user;
1da177e4
LT		 851 unsigned short *newscreen;
852
853 WARN_CONSOLE_UNLOCKED();
854
855 if (!vc)
856 return -ENXIO;
857
e400b6ec
AD		 858 user = vc->vc_resize_user;
859 vc->vc_resize_user = 0;
860
1da177e4
LT		 861 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
862 return -EINVAL;
863
864 new_cols = (cols ? cols : vc->vc_cols);
865 new_rows = (lines ? lines : vc->vc_rows);
866 new_row_size = new_cols << 1;
867 new_screen_size = new_row_size * new_rows;
868
869 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
870 return 0;
871
5cbded58 872 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 873 if (!newscreen)
874 return -ENOMEM;
875
876 old_rows = vc->vc_rows;
1da177e4 877 old_row_size = vc->vc_size_row;
1da177e4 878
e400b6ec 879 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 880 if (err) {
881 kfree(newscreen);
882 return err;
883 }
884
885 vc->vc_rows = new_rows;
886 vc->vc_cols = new_cols;
887 vc->vc_size_row = new_row_size;
888 vc->vc_screenbuf_size = new_screen_size;
889
890 rlth = min(old_row_size, new_row_size);
891 rrem = new_row_size - rlth;
892 old_origin = vc->vc_origin;
893 new_origin = (long) newscreen;
894 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 895
896 if (vc->vc_y > new_rows) {
897 if (old_rows - vc->vc_y < new_rows) {
898 /*
899 * Cursor near the bottom, copy contents from the
900 * bottom of buffer
901 */
902 old_origin += (old_rows - new_rows) * old_row_size;
3b41dc1a
AD		 903 } else {
904 /*
905 * Cursor is in no man's land, copy 1/2 screenful
906 * from the top and bottom of cursor position
907 */
908 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
3b41dc1a 909 }
9fc2b2d0
FJ		 910 }
911
912 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4
LT		 913
914 update_attr(vc);
915
3b41dc1a
AD		 916 while (old_origin < end) {
917 scr_memcpyw((unsigned short *) new_origin,
918 (unsigned short *) old_origin, rlth);
1da177e4 919 if (rrem)
3b41dc1a
AD		 920 scr_memsetw((void *)(new_origin + rlth),
921 vc->vc_video_erase_char, rrem);
1da177e4
LT		 922 old_origin += old_row_size;
923 new_origin += new_row_size;
924 }
925 if (new_scr_end > new_origin)
3b41dc1a
AD		 926 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
927 new_scr_end - new_origin);
5c9228f0 928 kfree(vc->vc_screenbuf);
1da177e4 929 vc->vc_screenbuf = newscreen;
1da177e4
LT		 930 vc->vc_screenbuf_size = new_screen_size;
931 set_origin(vc);
932
933 /* do part of a reset_terminal() */
934 vc->vc_top = 0;
935 vc->vc_bottom = vc->vc_rows;
936 gotoxy(vc, vc->vc_x, vc->vc_y);
937 save_cur(vc);
938
8c9a9dd0
AC		 939 if (tty) {
940 /* Rewrite the requested winsize data with the actual
941 resulting sizes */
942 struct winsize ws;
1da177e4
LT		 943 memset(&ws, 0, sizeof(ws));
944 ws.ws_row = vc->vc_rows;
945 ws.ws_col = vc->vc_cols;
946 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 947 tty_do_resize(tty, &ws);
1da177e4
LT		 948 }
949
950 if (CON_IS_VISIBLE(vc))
951 update_screen(vc);
8b92e87d 952 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 953 return err;
954}
955
8c9a9dd0
AC		 956/**
957 * vc_resize - resize a VT
958 * @vc: virtual console
959 * @cols: columns
960 * @rows: rows
961 *
962 * Resize a virtual console as seen from the console end of things. We
963 * use the common vc_do_resize methods to update the structures. The
964 * caller must hold the console sem to protect console internals and
8ce73264 965 * vc->port.tty
8c9a9dd0
AC		 966 */
967
968int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
969{
8ce73264 970 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 971}
972
973/**
974 * vt_resize - resize a VT
975 * @tty: tty to resize
8c9a9dd0
AC		 976 * @ws: winsize attributes
977 *
978 * Resize a virtual terminal. This is called by the tty layer as we
979 * register our own handler for resizing. The mutual helper does all
980 * the actual work.
981 *
982 * Takes the console sem and the called methods then take the tty
6a1c0680 983 * termios_rwsem and the tty ctrl_lock in that order.
8c9a9dd0 984 */
da2bdf9a 985static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 986{
8c9a9dd0
AC		 987 struct vc_data *vc = tty->driver_data;
988 int ret;
ca9bda00 989
ac751efa 990 console_lock();
fc6f6238 991 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 992 console_unlock();
8c9a9dd0 993 return ret;
ca9bda00 994}
1da177e4 995
421b40a6 996struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 997{
421b40a6
PH		 998 struct vc_data *vc = NULL;
999
1da177e4
LT		 1000 WARN_CONSOLE_UNLOCKED();
1001
1002 if (vc_cons_allocated(currcons)) {
421b40a6 1003 struct vt_notifier_param param;
4995f8ef 1004
421b40a6 1005 param.vc = vc = vc_cons[currcons].d;
b293d758 1006 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1007 vcs_remove_sysfs(currcons);
1da177e4 1008 vc->vc_sw->con_deinit(vc);
bde0d2c9 1009 put_pid(vc->vt_pid);
d459ec0b 1010 module_put(vc->vc_sw->owner);
5c9228f0 1011 kfree(vc->vc_screenbuf);
1da177e4
LT		 1012 vc_cons[currcons].d = NULL;
1013 }
421b40a6 1014 return vc;
1da177e4
LT		 1015}
1016
1017/*
1018 * VT102 emulator
1019 */
1020
079c9534
AC		 1021#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1022#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1023#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1024
1025#define decarm VC_REPEAT
1026#define decckm VC_CKMODE
1027#define kbdapplic VC_APPLIC
1028#define lnm VC_CRLF
1029
1030/*
1031 * this is what the terminal answers to a ESC-Z or csi0c query.
1032 */
1033#define VT100ID "\033[?1;2c"
1034#define VT102ID "\033[?6c"
1035
1036unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1037 8,12,10,14, 9,13,11,15 };
1038
1039/* the default colour table, for VGA+ colour systems */
1040int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1041 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1042int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1043 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1044int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1045 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1046
1c2bbe6a
JE		 1047module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1048module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1049module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1050
1da177e4
LT		 1051/*
1052 * gotoxy() must verify all boundaries, because the arguments
1053 * might also be negative. If the given position is out of
1054 * bounds, the cursor is placed at the nearest margin.
1055 */
1056static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1057{
1058 int min_y, max_y;
1059
1060 if (new_x < 0)
1061 vc->vc_x = 0;
1062 else {
1063 if (new_x >= vc->vc_cols)
1064 vc->vc_x = vc->vc_cols - 1;
1065 else
1066 vc->vc_x = new_x;
1067 }
1068
1069 if (vc->vc_decom) {
1070 min_y = vc->vc_top;
1071 max_y = vc->vc_bottom;
1072 } else {
1073 min_y = 0;
1074 max_y = vc->vc_rows;
1075 }
1076 if (new_y < min_y)
1077 vc->vc_y = min_y;
1078 else if (new_y >= max_y)
1079 vc->vc_y = max_y - 1;
1080 else
1081 vc->vc_y = new_y;
1082 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1083 vc->vc_need_wrap = 0;
1084}
1085
1086/* for absolute user moves, when decom is set */
1087static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1088{
1089 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1090}
1091
1092void scrollback(struct vc_data *vc, int lines)
1093{
1094 if (!lines)
1095 lines = vc->vc_rows / 2;
1096 scrolldelta(-lines);
1097}
1098
1099void scrollfront(struct vc_data *vc, int lines)
1100{
1101 if (!lines)
1102 lines = vc->vc_rows / 2;
1103 scrolldelta(lines);
1104}
1105
1106static void lf(struct vc_data *vc)
1107{
1108 /* don't scroll if above bottom of scrolling region, or
1109 * if below scrolling region
1110 */
1111 if (vc->vc_y + 1 == vc->vc_bottom)
1112 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1113 else if (vc->vc_y < vc->vc_rows - 1) {
1114 vc->vc_y++;
1115 vc->vc_pos += vc->vc_size_row;
1116 }
1117 vc->vc_need_wrap = 0;
b293d758 1118 notify_write(vc, '\n');
1da177e4
LT		 1119}
1120
1121static void ri(struct vc_data *vc)
1122{
1123 /* don't scroll if below top of scrolling region, or
1124 * if above scrolling region
1125 */
1126 if (vc->vc_y == vc->vc_top)
1127 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1128 else if (vc->vc_y > 0) {
1129 vc->vc_y--;
1130 vc->vc_pos -= vc->vc_size_row;
1131 }
1132 vc->vc_need_wrap = 0;
1133}
1134
1135static inline void cr(struct vc_data *vc)
1136{
1137 vc->vc_pos -= vc->vc_x << 1;
1138 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1139 notify_write(vc, '\r');
1da177e4
LT		 1140}
1141
1142static inline void bs(struct vc_data *vc)
1143{
1144 if (vc->vc_x) {
1145 vc->vc_pos -= 2;
1146 vc->vc_x--;
1147 vc->vc_need_wrap = 0;
b293d758 1148 notify_write(vc, '\b');
1da177e4
LT		 1149 }
1150}
1151
1152static inline void del(struct vc_data *vc)
1153{
1154 /* ignored */
1155}
1156
1157static void csi_J(struct vc_data *vc, int vpar)
1158{
1159 unsigned int count;
1160 unsigned short * start;
1161
1162 switch (vpar) {
1163 case 0: /* erase from cursor to end of display */
1164 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1165 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1166 break;
1167 case 1: /* erase from start to cursor */
1168 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1169 start = (unsigned short *)vc->vc_origin;
1da177e4 1170 break;
f8df13e0
PP		 1171 case 3: /* erase scroll-back buffer (and whole display) */
1172 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1173 vc->vc_screenbuf_size >> 1);
1174 set_origin(vc);
0930b095
PP		 1175 if (CON_IS_VISIBLE(vc))
1176 update_screen(vc);
f8df13e0 1177 /* fall through */
1da177e4
LT		 1178 case 2: /* erase whole display */
1179 count = vc->vc_cols * vc->vc_rows;
1180 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1181 break;
1182 default:
1183 return;
1184 }
1185 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
81732c3b
JFM		 1186 if (DO_UPDATE(vc))
1187 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1188 vc->vc_need_wrap = 0;
1189}
1190
1191static void csi_K(struct vc_data *vc, int vpar)
1192{
1193 unsigned int count;
1194 unsigned short * start;
1195
1196 switch (vpar) {
1197 case 0: /* erase from cursor to end of line */
1198 count = vc->vc_cols - vc->vc_x;
1199 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1200 break;
1201 case 1: /* erase from start of line to cursor */
1202 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1203 count = vc->vc_x + 1;
1da177e4
LT		 1204 break;
1205 case 2: /* erase whole line */
1206 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1207 count = vc->vc_cols;
1da177e4
LT		 1208 break;
1209 default:
1210 return;
1211 }
1212 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1213 vc->vc_need_wrap = 0;
81732c3b
JFM		 1214 if (DO_UPDATE(vc))
1215 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1216}
1217
1218static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1219{ /* not vt100? */
1220 int count;
1221
1222 if (!vpar)
1223 vpar++;
1224 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1225
1226 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1227 if (DO_UPDATE(vc))
1228 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1229 vc->vc_need_wrap = 0;
1230}
1231
1232static void default_attr(struct vc_data *vc)
1233{
1234 vc->vc_intensity = 1;
fa6ce9ab 1235 vc->vc_italic = 0;
1da177e4
LT		 1236 vc->vc_underline = 0;
1237 vc->vc_reverse = 0;
1238 vc->vc_blink = 0;
1239 vc->vc_color = vc->vc_def_color;
1240}
1241
cec5b2a9
AB		 1242struct rgb { u8 r; u8 g; u8 b; };
1243
678afb9a 1244static struct rgb rgb_from_256(int i)
cec5b2a9
AB		 1245{
1246 struct rgb c;
1247 if (i < 8) { /* Standard colours. */
1248 c.r = i&1 ? 0xaa : 0x00;
1249 c.g = i&2 ? 0xaa : 0x00;
1250 c.b = i&4 ? 0xaa : 0x00;
1251 } else if (i < 16) {
1252 c.r = i&1 ? 0xff : 0x55;
1253 c.g = i&2 ? 0xff : 0x55;
1254 c.b = i&4 ? 0xff : 0x55;
1255 } else if (i < 232) { /* 6x6x6 colour cube. */
1256 c.r = (i - 16) / 36 * 85 / 2;
1257 c.g = (i - 16) / 6 % 6 * 85 / 2;
1258 c.b = (i - 16) % 6 * 85 / 2;
1259 } else /* Grayscale ramp. */
1260 c.r = c.g = c.b = i * 10 - 2312;
1261 return c;
1262}
1263
1264static void rgb_foreground(struct vc_data *vc, struct rgb c)
1265{
1266 u8 hue, max = c.r;
1267 if (c.g > max)
1268 max = c.g;
1269 if (c.b > max)
1270 max = c.b;
1271 hue = (c.r > max/2 ? 4 : 0)
1272 | (c.g > max/2 ? 2 : 0)
1273 | (c.b > max/2 ? 1 : 0);
1274 if (hue == 7 && max <= 0x55)
1275 hue = 0, vc->vc_intensity = 2;
1276 else
1277 vc->vc_intensity = (max > 0xaa) + 1;
1278 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1279}
1280
1281static void rgb_background(struct vc_data *vc, struct rgb c)
1282{
1283 /* For backgrounds, err on the dark side. */
1284 vc->vc_color = (vc->vc_color & 0x0f)
1285 | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1286}
1287
ac751efa 1288/* console_lock is held */
1da177e4
LT		 1289static void csi_m(struct vc_data *vc)
1290{
1291 int i;
1292
1293 for (i = 0; i <= vc->vc_npar; i++)
1294 switch (vc->vc_par[i]) {
1295 case 0: /* all attributes off */
1296 default_attr(vc);
1297 break;
1298 case 1:
1299 vc->vc_intensity = 2;
1300 break;
1301 case 2:
1302 vc->vc_intensity = 0;
1303 break;
fa6ce9ab
JE		 1304 case 3:
1305 vc->vc_italic = 1;
1306 break;
1da177e4
LT		 1307 case 4:
1308 vc->vc_underline = 1;
1309 break;
1310 case 5:
1311 vc->vc_blink = 1;
1312 break;
1313 case 7:
1314 vc->vc_reverse = 1;
1315 break;
1316 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1317 * Select primary font, don't display
1318 * control chars if defined, don't set
1319 * bit 8 on output.
1320 */
1321 vc->vc_translate = set_translate(vc->vc_charset == 0
1322 ? vc->vc_G0_charset
1323 : vc->vc_G1_charset, vc);
1324 vc->vc_disp_ctrl = 0;
1325 vc->vc_toggle_meta = 0;
1326 break;
1327 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1328 * Select first alternate font, lets
1329 * chars < 32 be displayed as ROM chars.
1330 */
1331 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1332 vc->vc_disp_ctrl = 1;
1333 vc->vc_toggle_meta = 0;
1334 break;
1335 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1336 * Select second alternate font, toggle
1337 * high bit before displaying as ROM char.
1338 */
1339 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1340 vc->vc_disp_ctrl = 1;
1341 vc->vc_toggle_meta = 1;
1342 break;
1343 case 21:
1344 case 22:
1345 vc->vc_intensity = 1;
1346 break;
fa6ce9ab
JE		 1347 case 23:
1348 vc->vc_italic = 0;
1349 break;
1da177e4
LT		 1350 case 24:
1351 vc->vc_underline = 0;
1352 break;
1353 case 25:
1354 vc->vc_blink = 0;
1355 break;
1356 case 27:
1357 vc->vc_reverse = 0;
1358 break;
cec5b2a9 1359 case 38: /* ITU T.416
3415097f
AB		 1360 * Higher colour modes.
1361 * They break the usual properties of SGR codes
1362 * and thus need to be detected and ignored by
1363 * hand. Strictly speaking, that standard also
1364 * wants : rather than ; as separators, contrary
1365 * to ECMA-48, but no one produces such codes
1366 * and almost no one accepts them.
1367 */
1368 i++;
1369 if (i > vc->vc_npar)
1370 break;
cec5b2a9
AB		 1371 if (vc->vc_par[i] == 5 && /* 256 colours */
1372 i < vc->vc_npar) { /* ubiquitous */
1373 i++;
1374 rgb_foreground(vc,
1375 rgb_from_256(vc->vc_par[i]));
1376 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1377 i <= vc->vc_npar + 3) {/* extremely rare */
085f4d84
PF		 1378 struct rgb c = {
1379 .r = vc->vc_par[i + 1],
1380 .g = vc->vc_par[i + 2],
1381 .b = vc->vc_par[i + 3],
1382 };
cec5b2a9
AB		 1383 rgb_foreground(vc, c);
1384 i += 3;
1385 }
3415097f 1386 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
cec5b2a9 1387 * there's no point in supporting them.
3415097f
AB		 1388 */
1389 break;
cec5b2a9
AB		 1390 case 48:
1391 i++;
1392 if (i > vc->vc_npar)
1393 break;
1394 if (vc->vc_par[i] == 5 && /* 256 colours */
1395 i < vc->vc_npar) {
1396 i++;
1397 rgb_background(vc,
1398 rgb_from_256(vc->vc_par[i]));
1399 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1400 i <= vc->vc_npar + 3) {
085f4d84
PF		 1401 struct rgb c = {
1402 .r = vc->vc_par[i + 1],
1403 .g = vc->vc_par[i + 2],
1404 .b = vc->vc_par[i + 3],
1405 };
cec5b2a9
AB		 1406 rgb_background(vc, c);
1407 i += 3;
1408 }
1409 break;
64545880 1410 case 39:
1da177e4 1411 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1da177e4
LT		 1412 break;
1413 case 49:
1414 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1415 break;
1416 default:
1417 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1418 vc->vc_color = color_table[vc->vc_par[i] - 30]
1419 | (vc->vc_color & 0xf0);
1420 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1421 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1422 | (vc->vc_color & 0x0f);
1423 break;
1424 }
1425 update_attr(vc);
1426}
1427
6732c8bb 1428static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1429{
1430 while (*p) {
6732c8bb 1431 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1432 p++;
1433 }
6732c8bb 1434 tty_schedule_flip(port);
1da177e4
LT		 1435}
1436
1437static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1438{
1439 char buf[40];
1440
1441 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1442 respond_string(buf, tty->port);
1da177e4
LT		 1443}
1444
1445static inline void status_report(struct tty_struct *tty)
1446{
6732c8bb 1447 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1448}
1449
6732c8bb 1450static inline void respond_ID(struct tty_struct *tty)
1da177e4 1451{
6732c8bb 1452 respond_string(VT102ID, tty->port);
1da177e4
LT		 1453}
1454
1455void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1456{
1457 char buf[8];
1458
1459 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1460 (char)('!' + mry));
6732c8bb 1461 respond_string(buf, tty->port);
1da177e4
LT		 1462}
1463
1464/* invoked via ioctl(TIOCLINUX) and through set_selection */
1465int mouse_reporting(void)
1466{
1467 return vc_cons[fg_console].d->vc_report_mouse;
1468}
1469
ac751efa 1470/* console_lock is held */
1da177e4
LT		 1471static void set_mode(struct vc_data *vc, int on_off)
1472{
1473 int i;
1474
1475 for (i = 0; i <= vc->vc_npar; i++)
1476 if (vc->vc_ques) {
1477 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1478 case 1: /* Cursor keys send ^[Ox/^[[x */
1479 if (on_off)
1480 set_kbd(vc, decckm);
1481 else
1482 clr_kbd(vc, decckm);
1483 break;
1484 case 3: /* 80/132 mode switch unimplemented */
1485 vc->vc_deccolm = on_off;
1486#if 0
1487 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1488 /* this alone does not suffice; some user mode
1489 utility has to change the hardware regs */
1490#endif
1491 break;
1492 case 5: /* Inverted screen on/off */
1493 if (vc->vc_decscnm != on_off) {
1494 vc->vc_decscnm = on_off;
1495 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1496 update_attr(vc);
1497 }
1498 break;
1499 case 6: /* Origin relative/absolute */
1500 vc->vc_decom = on_off;
1501 gotoxay(vc, 0, 0);
1502 break;
1503 case 7: /* Autowrap on/off */
1504 vc->vc_decawm = on_off;
1505 break;
1506 case 8: /* Autorepeat on/off */
1507 if (on_off)
1508 set_kbd(vc, decarm);
1509 else
1510 clr_kbd(vc, decarm);
1511 break;
1512 case 9:
1513 vc->vc_report_mouse = on_off ? 1 : 0;
1514 break;
1515 case 25: /* Cursor on/off */
1516 vc->vc_deccm = on_off;
1517 break;
1518 case 1000:
1519 vc->vc_report_mouse = on_off ? 2 : 0;
1520 break;
1521 }
1522 } else {
1523 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1524 case 3: /* Monitor (display ctrls) */
1525 vc->vc_disp_ctrl = on_off;
1526 break;
1527 case 4: /* Insert Mode on/off */
1528 vc->vc_decim = on_off;
1529 break;
1530 case 20: /* Lf, Enter == CrLf/Lf */
1531 if (on_off)
1532 set_kbd(vc, lnm);
1533 else
1534 clr_kbd(vc, lnm);
1535 break;
1536 }
1537 }
1538}
1539
ac751efa 1540/* console_lock is held */
1da177e4
LT		 1541static void setterm_command(struct vc_data *vc)
1542{
1543 switch(vc->vc_par[0]) {
1544 case 1: /* set color for underline mode */
1545 if (vc->vc_can_do_color &&
1546 vc->vc_par[1] < 16) {
1547 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1548 if (vc->vc_underline)
1549 update_attr(vc);
1550 }
1551 break;
1552 case 2: /* set color for half intensity mode */
1553 if (vc->vc_can_do_color &&
1554 vc->vc_par[1] < 16) {
1555 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1556 if (vc->vc_intensity == 0)
1557 update_attr(vc);
1558 }
1559 break;
1560 case 8: /* store colors as defaults */
1561 vc->vc_def_color = vc->vc_attr;
1562 if (vc->vc_hi_font_mask == 0x100)
1563 vc->vc_def_color >>= 1;
1564 default_attr(vc);
1565 update_attr(vc);
1566 break;
1567 case 9: /* set blanking interval */
f324edc8 1568 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1569 poke_blanked_console();
1570 break;
1571 case 10: /* set bell frequency in Hz */
1572 if (vc->vc_npar >= 1)
1573 vc->vc_bell_pitch = vc->vc_par[1];
1574 else
1575 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1576 break;
1577 case 11: /* set bell duration in msec */
1578 if (vc->vc_npar >= 1)
1579 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
3372ec28 1580 msecs_to_jiffies(vc->vc_par[1]) : 0;
1da177e4
LT		 1581 else
1582 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1583 break;
1584 case 12: /* bring specified console to the front */
1585 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1586 set_console(vc->vc_par[1] - 1);
1587 break;
1588 case 13: /* unblank the screen */
1589 poke_blanked_console();
1590 break;
1591 case 14: /* set vesa powerdown interval */
1592 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1593 break;
1594 case 15: /* activate the previous console */
1595 set_console(last_console);
1596 break;
bd63364c
SD		 1597 case 16: /* set cursor blink duration in msec */
1598 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1599 vc->vc_par[1] <= USHRT_MAX)
1600 vc->vc_cur_blink_ms = vc->vc_par[1];
1601 else
1602 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1603 break;
1da177e4
LT		 1604 }
1605}
1606
ac751efa 1607/* console_lock is held */
1da177e4
LT		 1608static void csi_at(struct vc_data *vc, unsigned int nr)
1609{
1610 if (nr > vc->vc_cols - vc->vc_x)
1611 nr = vc->vc_cols - vc->vc_x;
1612 else if (!nr)
1613 nr = 1;
1614 insert_char(vc, nr);
1615}
1616
ac751efa 1617/* console_lock is held */
1da177e4
LT		 1618static void csi_L(struct vc_data *vc, unsigned int nr)
1619{
1620 if (nr > vc->vc_rows - vc->vc_y)
1621 nr = vc->vc_rows - vc->vc_y;
1622 else if (!nr)
1623 nr = 1;
1624 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1625 vc->vc_need_wrap = 0;
1626}
1627
ac751efa 1628/* console_lock is held */
1da177e4
LT		 1629static void csi_P(struct vc_data *vc, unsigned int nr)
1630{
1631 if (nr > vc->vc_cols - vc->vc_x)
1632 nr = vc->vc_cols - vc->vc_x;
1633 else if (!nr)
1634 nr = 1;
1635 delete_char(vc, nr);
1636}
1637
ac751efa 1638/* console_lock is held */
1da177e4
LT		 1639static void csi_M(struct vc_data *vc, unsigned int nr)
1640{
1641 if (nr > vc->vc_rows - vc->vc_y)
1642 nr = vc->vc_rows - vc->vc_y;
1643 else if (!nr)
1644 nr=1;
1645 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1646 vc->vc_need_wrap = 0;
1647}
1648
ac751efa 1649/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1650static void save_cur(struct vc_data *vc)
1651{
1652 vc->vc_saved_x = vc->vc_x;
1653 vc->vc_saved_y = vc->vc_y;
1654 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1655 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1656 vc->vc_s_underline = vc->vc_underline;
1657 vc->vc_s_blink = vc->vc_blink;
1658 vc->vc_s_reverse = vc->vc_reverse;
1659 vc->vc_s_charset = vc->vc_charset;
1660 vc->vc_s_color = vc->vc_color;
1661 vc->vc_saved_G0 = vc->vc_G0_charset;
1662 vc->vc_saved_G1 = vc->vc_G1_charset;
1663}
1664
ac751efa 1665/* console_lock is held */
1da177e4
LT		 1666static void restore_cur(struct vc_data *vc)
1667{
1668 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1669 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1670 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1671 vc->vc_underline = vc->vc_s_underline;
1672 vc->vc_blink = vc->vc_s_blink;
1673 vc->vc_reverse = vc->vc_s_reverse;
1674 vc->vc_charset = vc->vc_s_charset;
1675 vc->vc_color = vc->vc_s_color;
1676 vc->vc_G0_charset = vc->vc_saved_G0;
1677 vc->vc_G1_charset = vc->vc_saved_G1;
1678 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1679 update_attr(vc);
1680 vc->vc_need_wrap = 0;
1681}
1682
b290af68 1683enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1da177e4 1684 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
63f3a16d 1685 ESpalette, ESosc };
1da177e4 1686
ac751efa 1687/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1688static void reset_terminal(struct vc_data *vc, int do_clear)
1689{
1690 vc->vc_top = 0;
1691 vc->vc_bottom = vc->vc_rows;
1692 vc->vc_state = ESnormal;
1693 vc->vc_ques = 0;
1694 vc->vc_translate = set_translate(LAT1_MAP, vc);
1695 vc->vc_G0_charset = LAT1_MAP;
1696 vc->vc_G1_charset = GRAF_MAP;
1697 vc->vc_charset = 0;
1698 vc->vc_need_wrap = 0;
1699 vc->vc_report_mouse = 0;
042f10ec 1700 vc->vc_utf = default_utf8;
1da177e4
LT		 1701 vc->vc_utf_count = 0;
1702
1703 vc->vc_disp_ctrl = 0;
1704 vc->vc_toggle_meta = 0;
1705
1706 vc->vc_decscnm = 0;
1707 vc->vc_decom = 0;
1708 vc->vc_decawm = 1;
f6c06b68 1709 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1710 vc->vc_decim = 0;
1711
079c9534 1712 vt_reset_keyboard(vc->vc_num);
1da177e4 1713
9ea9a886 1714 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1715 vc->vc_complement_mask = vc->vc_s_complement_mask;
1716
1717 default_attr(vc);
1718 update_attr(vc);
1719
1720 vc->vc_tab_stop[0] = 0x01010100;
1721 vc->vc_tab_stop[1] =
1722 vc->vc_tab_stop[2] =
1723 vc->vc_tab_stop[3] =
a564738c
WK		 1724 vc->vc_tab_stop[4] =
1725 vc->vc_tab_stop[5] =
1726 vc->vc_tab_stop[6] =
1727 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1728
1729 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1730 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 1731 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1732
1733 gotoxy(vc, 0, 0);
1734 save_cur(vc);
1735 if (do_clear)
1736 csi_J(vc, 2);
1737}
1738
ac751efa 1739/* console_lock is held */
1da177e4
LT		 1740static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1741{
1742 /*
1743 * Control characters can be used in the _middle_
1744 * of an escape sequence.
1745 */
63f3a16d
AB		 1746 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1747 return;
1da177e4
LT		 1748 switch (c) {
1749 case 0:
1750 return;
1751 case 7:
63f3a16d
AB		 1752 if (vc->vc_state == ESosc)
1753 vc->vc_state = ESnormal;
1754 else if (vc->vc_bell_duration)
1da177e4
LT		 1755 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1756 return;
1757 case 8:
1758 bs(vc);
1759 return;
1760 case 9:
1761 vc->vc_pos -= (vc->vc_x << 1);
1762 while (vc->vc_x < vc->vc_cols - 1) {
1763 vc->vc_x++;
1764 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1765 break;
1766 }
1767 vc->vc_pos += (vc->vc_x << 1);
b293d758 1768 notify_write(vc, '\t');
1da177e4
LT		 1769 return;
1770 case 10: case 11: case 12:
1771 lf(vc);
1772 if (!is_kbd(vc, lnm))
1773 return;
1774 case 13:
1775 cr(vc);
1776 return;
1777 case 14:
1778 vc->vc_charset = 1;
1779 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1780 vc->vc_disp_ctrl = 1;
1781 return;
1782 case 15:
1783 vc->vc_charset = 0;
1784 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1785 vc->vc_disp_ctrl = 0;
1786 return;
1787 case 24: case 26:
1788 vc->vc_state = ESnormal;
1789 return;
1790 case 27:
1791 vc->vc_state = ESesc;
1792 return;
1793 case 127:
1794 del(vc);
1795 return;
1796 case 128+27:
1797 vc->vc_state = ESsquare;
1798 return;
1799 }
1800 switch(vc->vc_state) {
1801 case ESesc:
1802 vc->vc_state = ESnormal;
1803 switch (c) {
1804 case '[':
1805 vc->vc_state = ESsquare;
1806 return;
1807 case ']':
1808 vc->vc_state = ESnonstd;
1809 return;
1810 case '%':
1811 vc->vc_state = ESpercent;
1812 return;
1813 case 'E':
1814 cr(vc);
1815 lf(vc);
1816 return;
1817 case 'M':
1818 ri(vc);
1819 return;
1820 case 'D':
1821 lf(vc);
1822 return;
1823 case 'H':
1824 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1825 return;
1826 case 'Z':
1827 respond_ID(tty);
1828 return;
1829 case '7':
1830 save_cur(vc);
1831 return;
1832 case '8':
1833 restore_cur(vc);
1834 return;
1835 case '(':
1836 vc->vc_state = ESsetG0;
1837 return;
1838 case ')':
1839 vc->vc_state = ESsetG1;
1840 return;
1841 case '#':
1842 vc->vc_state = EShash;
1843 return;
1844 case 'c':
1845 reset_terminal(vc, 1);
1846 return;
1847 case '>': /* Numeric keypad */
1848 clr_kbd(vc, kbdapplic);
1849 return;
1850 case '=': /* Appl. keypad */
1851 set_kbd(vc, kbdapplic);
1852 return;
1853 }
1854 return;
1855 case ESnonstd:
1856 if (c=='P') { /* palette escape sequence */
1857 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1858 vc->vc_par[vc->vc_npar] = 0;
1859 vc->vc_npar = 0;
1860 vc->vc_state = ESpalette;
1861 return;
1862 } else if (c=='R') { /* reset palette */
1863 reset_palette(vc);
1864 vc->vc_state = ESnormal;
63f3a16d
AB		 1865 } else if (c>='0' && c<='9')
1866 vc->vc_state = ESosc;
1867 else
1da177e4
LT		 1868 vc->vc_state = ESnormal;
1869 return;
1870 case ESpalette:
74c807ce
AS		 1871 if (isxdigit(c)) {
1872 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1873 if (vc->vc_npar == 7) {
1874 int i = vc->vc_par[0] * 3, j = 1;
1875 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1876 vc->vc_palette[i++] += vc->vc_par[j++];
1877 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1878 vc->vc_palette[i++] += vc->vc_par[j++];
1879 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1880 vc->vc_palette[i] += vc->vc_par[j];
1881 set_palette(vc);
1882 vc->vc_state = ESnormal;
1883 }
1884 } else
1885 vc->vc_state = ESnormal;
1886 return;
1887 case ESsquare:
1888 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1889 vc->vc_par[vc->vc_npar] = 0;
1890 vc->vc_npar = 0;
1891 vc->vc_state = ESgetpars;
1892 if (c == '[') { /* Function key */
1893 vc->vc_state=ESfunckey;
1894 return;
1895 }
1896 vc->vc_ques = (c == '?');
1897 if (vc->vc_ques)
1898 return;
1899 case ESgetpars:
1900 if (c == ';' && vc->vc_npar < NPAR - 1) {
1901 vc->vc_npar++;
1902 return;
1903 } else if (c>='0' && c<='9') {
1904 vc->vc_par[vc->vc_npar] *= 10;
1905 vc->vc_par[vc->vc_npar] += c - '0';
1906 return;
b290af68 1907 }
1da177e4
LT		 1908 vc->vc_state = ESnormal;
1909 switch(c) {
1910 case 'h':
1911 set_mode(vc, 1);
1912 return;
1913 case 'l':
1914 set_mode(vc, 0);
1915 return;
1916 case 'c':
1917 if (vc->vc_ques) {
1918 if (vc->vc_par[0])
1919 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1920 else
9ea9a886 1921 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1922 return;
1923 }
1924 break;
1925 case 'm':
1926 if (vc->vc_ques) {
1927 clear_selection();
1928 if (vc->vc_par[0])
1929 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1930 else
1931 vc->vc_complement_mask = vc->vc_s_complement_mask;
1932 return;
1933 }
1934 break;
1935 case 'n':
1936 if (!vc->vc_ques) {
1937 if (vc->vc_par[0] == 5)
1938 status_report(tty);
1939 else if (vc->vc_par[0] == 6)
1940 cursor_report(vc, tty);
1941 }
1942 return;
1943 }
1944 if (vc->vc_ques) {
1945 vc->vc_ques = 0;
1946 return;
1947 }
1948 switch(c) {
1949 case 'G': case '`':
1950 if (vc->vc_par[0])
1951 vc->vc_par[0]--;
1952 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1953 return;
1954 case 'A':
1955 if (!vc->vc_par[0])
1956 vc->vc_par[0]++;
1957 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1958 return;
1959 case 'B': case 'e':
1960 if (!vc->vc_par[0])
1961 vc->vc_par[0]++;
1962 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1963 return;
1964 case 'C': case 'a':
1965 if (!vc->vc_par[0])
1966 vc->vc_par[0]++;
1967 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1968 return;
1969 case 'D':
1970 if (!vc->vc_par[0])
1971 vc->vc_par[0]++;
1972 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1973 return;
1974 case 'E':
1975 if (!vc->vc_par[0])
1976 vc->vc_par[0]++;
1977 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1978 return;
1979 case 'F':
1980 if (!vc->vc_par[0])
1981 vc->vc_par[0]++;
1982 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1983 return;
1984 case 'd':
1985 if (vc->vc_par[0])
1986 vc->vc_par[0]--;
1987 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1988 return;
1989 case 'H': case 'f':
1990 if (vc->vc_par[0])
1991 vc->vc_par[0]--;
1992 if (vc->vc_par[1])
1993 vc->vc_par[1]--;
1994 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1995 return;
1996 case 'J':
1997 csi_J(vc, vc->vc_par[0]);
1998 return;
1999 case 'K':
2000 csi_K(vc, vc->vc_par[0]);
2001 return;
2002 case 'L':
2003 csi_L(vc, vc->vc_par[0]);
2004 return;
2005 case 'M':
2006 csi_M(vc, vc->vc_par[0]);
2007 return;
2008 case 'P':
2009 csi_P(vc, vc->vc_par[0]);
2010 return;
2011 case 'c':
2012 if (!vc->vc_par[0])
2013 respond_ID(tty);
2014 return;
2015 case 'g':
2016 if (!vc->vc_par[0])
2017 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2018 else if (vc->vc_par[0] == 3) {
2019 vc->vc_tab_stop[0] =
2020 vc->vc_tab_stop[1] =
2021 vc->vc_tab_stop[2] =
2022 vc->vc_tab_stop[3] =
a564738c
WK		 2023 vc->vc_tab_stop[4] =
2024 vc->vc_tab_stop[5] =
2025 vc->vc_tab_stop[6] =
2026 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 2027 }
2028 return;
2029 case 'm':
2030 csi_m(vc);
2031 return;
2032 case 'q': /* DECLL - but only 3 leds */
2033 /* map 0,1,2,3 to 0,1,2,4 */
2034 if (vc->vc_par[0] < 4)
079c9534 2035 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2036 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2037 return;
2038 case 'r':
2039 if (!vc->vc_par[0])
2040 vc->vc_par[0]++;
2041 if (!vc->vc_par[1])
2042 vc->vc_par[1] = vc->vc_rows;
2043 /* Minimum allowed region is 2 lines */
2044 if (vc->vc_par[0] < vc->vc_par[1] &&
2045 vc->vc_par[1] <= vc->vc_rows) {
2046 vc->vc_top = vc->vc_par[0] - 1;
2047 vc->vc_bottom = vc->vc_par[1];
2048 gotoxay(vc, 0, 0);
2049 }
2050 return;
2051 case 's':
2052 save_cur(vc);
2053 return;
2054 case 'u':
2055 restore_cur(vc);
2056 return;
2057 case 'X':
2058 csi_X(vc, vc->vc_par[0]);
2059 return;
2060 case '@':
2061 csi_at(vc, vc->vc_par[0]);
2062 return;
2063 case ']': /* setterm functions */
2064 setterm_command(vc);
2065 return;
2066 }
2067 return;
2068 case ESpercent:
2069 vc->vc_state = ESnormal;
2070 switch (c) {
2071 case '@': /* defined in ISO 2022 */
2072 vc->vc_utf = 0;
2073 return;
2074 case 'G': /* prelim official escape code */
2075 case '8': /* retained for compatibility */
2076 vc->vc_utf = 1;
2077 return;
2078 }
2079 return;
2080 case ESfunckey:
2081 vc->vc_state = ESnormal;
2082 return;
2083 case EShash:
2084 vc->vc_state = ESnormal;
2085 if (c == '8') {
2086 /* DEC screen alignment test. kludge :-) */
2087 vc->vc_video_erase_char =
2088 (vc->vc_video_erase_char & 0xff00) | 'E';
2089 csi_J(vc, 2);
2090 vc->vc_video_erase_char =
2091 (vc->vc_video_erase_char & 0xff00) | ' ';
2092 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2093 }
2094 return;
2095 case ESsetG0:
2096 if (c == '0')
2097 vc->vc_G0_charset = GRAF_MAP;
2098 else if (c == 'B')
2099 vc->vc_G0_charset = LAT1_MAP;
2100 else if (c == 'U')
2101 vc->vc_G0_charset = IBMPC_MAP;
2102 else if (c == 'K')
2103 vc->vc_G0_charset = USER_MAP;
2104 if (vc->vc_charset == 0)
2105 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2106 vc->vc_state = ESnormal;
2107 return;
2108 case ESsetG1:
2109 if (c == '0')
2110 vc->vc_G1_charset = GRAF_MAP;
2111 else if (c == 'B')
2112 vc->vc_G1_charset = LAT1_MAP;
2113 else if (c == 'U')
2114 vc->vc_G1_charset = IBMPC_MAP;
2115 else if (c == 'K')
2116 vc->vc_G1_charset = USER_MAP;
2117 if (vc->vc_charset == 1)
2118 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2119 vc->vc_state = ESnormal;
2120 return;
63f3a16d
AB		 2121 case ESosc:
2122 return;
1da177e4
LT		 2123 default:
2124 vc->vc_state = ESnormal;
2125 }
2126}
2127
2f1a2ccb 2128/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2129 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2130 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2131 */
2132struct interval {
2133 uint32_t first;
2134 uint32_t last;
2135};
2136
2137static int bisearch(uint32_t ucs, const struct interval *table, int max)
2138{
2139 int min = 0;
2140 int mid;
2141
2142 if (ucs < table[0].first || ucs > table[max].last)
2143 return 0;
2144 while (max >= min) {
2145 mid = (min + max) / 2;
2146 if (ucs > table[mid].last)
2147 min = mid + 1;
2148 else if (ucs < table[mid].first)
2149 max = mid - 1;
2150 else
2151 return 1;
2152 }
2153 return 0;
2154}
2155
2156static int is_double_width(uint32_t ucs)
2157{
2158 static const struct interval double_width[] = {
2159 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2160 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2161 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2162 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2163 };
0f11541b 2164 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2165}
2166
ac751efa 2167/* acquires console_lock */
1da177e4
LT		 2168static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2169{
2170#ifdef VT_BUF_VRAM_ONLY
2171#define FLUSH do { } while(0);
2172#else
2173#define FLUSH if (draw_x >= 0) { \
2174 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2175 draw_x = -1; \
2176 }
2177#endif
2178
2179 int c, tc, ok, n = 0, draw_x = -1;
2180 unsigned int currcons;
2181 unsigned long draw_from = 0, draw_to = 0;
2182 struct vc_data *vc;
2f1a2ccb 2183 unsigned char vc_attr;
0341a4d0 2184 struct vt_notifier_param param;
2f1a2ccb
EK		 2185 uint8_t rescan;
2186 uint8_t inverse;
2187 uint8_t width;
1da177e4 2188 u16 himask, charmask;
1da177e4
LT		 2189
2190 if (in_interrupt())
2191 return count;
2192
2193 might_sleep();
2194
ac751efa 2195 console_lock();
1da177e4
LT		 2196 vc = tty->driver_data;
2197 if (vc == NULL) {
2198 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2199 console_unlock();
1da177e4
LT		 2200 return 0;
2201 }
2202
2203 currcons = vc->vc_num;
2204 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2205 /* could this happen? */
2206 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2207 console_unlock();
2208 return 0;
1da177e4 2209 }
1da177e4 2210
1da177e4
LT		 2211 himask = vc->vc_hi_font_mask;
2212 charmask = himask ? 0x1ff : 0xff;
2213
2214 /* undraw cursor first */
2215 if (IS_FG(vc))
2216 hide_cursor(vc);
2217
0341a4d0
KD		 2218 param.vc = vc;
2219
1da177e4
LT		 2220 while (!tty->stopped && count) {
2221 int orig = *buf;
2222 c = orig;
2223 buf++;
2224 n++;
2225 count--;
2f1a2ccb
EK		 2226 rescan = 0;
2227 inverse = 0;
2228 width = 1;
1da177e4
LT		 2229
2230 /* Do no translation at all in control states */
2231 if (vc->vc_state != ESnormal) {
2232 tc = c;
d4328b40 2233 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2234 /* Combine UTF-8 into Unicode in vc_utf_char.
2235 * vc_utf_count is the number of continuation bytes still
2236 * expected to arrive.
2237 * vc_npar is the number of continuation bytes arrived so
2238 * far
2239 */
d4328b40 2240rescan_last_byte:
2f1a2ccb
EK		 2241 if ((c & 0xc0) == 0x80) {
2242 /* Continuation byte received */
2243 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2244 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2245 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2246 vc->vc_npar++;
2247 if (--vc->vc_utf_count) {
2248 /* Still need some bytes */
1da177e4 2249 continue;
2f1a2ccb
EK		 2250 }
2251 /* Got a whole character */
2252 c = vc->vc_utf_char;
2253 /* Reject overlong sequences */
2254 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2255 c > utf8_length_changes[vc->vc_npar])
2256 c = 0xfffd;
2257 } else {
2258 /* Unexpected continuation byte */
2259 vc->vc_utf_count = 0;
2260 c = 0xfffd;
2261 }
1da177e4 2262 } else {
2f1a2ccb
EK		 2263 /* Single ASCII byte or first byte of a sequence received */
2264 if (vc->vc_utf_count) {
2265 /* Continuation byte expected */
2266 rescan = 1;
2267 vc->vc_utf_count = 0;
2268 c = 0xfffd;
2269 } else if (c > 0x7f) {
2270 /* First byte of a multibyte sequence received */
2271 vc->vc_npar = 0;
2272 if ((c & 0xe0) == 0xc0) {
2273 vc->vc_utf_count = 1;
2274 vc->vc_utf_char = (c & 0x1f);
2275 } else if ((c & 0xf0) == 0xe0) {
2276 vc->vc_utf_count = 2;
2277 vc->vc_utf_char = (c & 0x0f);
2278 } else if ((c & 0xf8) == 0xf0) {
2279 vc->vc_utf_count = 3;
2280 vc->vc_utf_char = (c & 0x07);
2281 } else if ((c & 0xfc) == 0xf8) {
2282 vc->vc_utf_count = 4;
2283 vc->vc_utf_char = (c & 0x03);
2284 } else if ((c & 0xfe) == 0xfc) {
2285 vc->vc_utf_count = 5;
2286 vc->vc_utf_char = (c & 0x01);
2287 } else {
2288 /* 254 and 255 are invalid */
2289 c = 0xfffd;
2290 }
2291 if (vc->vc_utf_count) {
2292 /* Still need some bytes */
2293 continue;
2294 }
2295 }
2296 /* Nothing to do if an ASCII byte was received */
1da177e4 2297 }
2f1a2ccb
EK		 2298 /* End of UTF-8 decoding. */
2299 /* c is the received character, or U+FFFD for invalid sequences. */
2300 /* Replace invalid Unicode code points with U+FFFD too */
2301 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2302 c = 0xfffd;
2303 tc = c;
d4328b40 2304 } else { /* no utf or alternate charset mode */
a29ccf6f 2305 tc = vc_translate(vc, c);
1da177e4
LT		 2306 }
2307
0341a4d0
KD		 2308 param.c = tc;
2309 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2310 &param) == NOTIFY_STOP)
2311 continue;
2312
1da177e4
LT		 2313 /* If the original code was a control character we
2314 * only allow a glyph to be displayed if the code is
2315 * not normally used (such as for cursor movement) or
2316 * if the disp_ctrl mode has been explicitly enabled.
2317 * Certain characters (as given by the CTRL_ALWAYS
2318 * bitmap) are always displayed as control characters,
2319 * as the console would be pretty useless without
2320 * them; to display an arbitrary font position use the
2321 * direct-to-font zone in UTF-8 mode.
2322 */
2323 ok = tc && (c >= 32 ||
d4328b40
AT		 2324 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2325 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2326 && (c != 127 || vc->vc_disp_ctrl)
2327 && (c != 128+27);
2328
2329 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2330 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2331 if (is_double_width(c))
2332 width = 2;
2333 }
1da177e4
LT		 2334 /* Now try to find out how to display it */
2335 tc = conv_uni_to_pc(vc, tc);
d4328b40 2336 if (tc & ~charmask) {
2f1a2ccb
EK		 2337 if (tc == -1 || tc == -2) {
2338 continue; /* nothing to display */
2339 }
2340 /* Glyph not found */
c0b79882 2341 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2342 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2343 This would make absolutely no sense with Unicode in mind,
2344 but do this for ASCII characters since a font may lack
2345 Unicode mapping info and we don't want to end up with
2346 having question marks only. */
2f1a2ccb
EK		 2347 tc = c;
2348 } else {
2349 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2350 tc = conv_uni_to_pc(vc, 0xfffd);
2351 if (tc < 0) {
2352 inverse = 1;
2353 tc = conv_uni_to_pc(vc, '?');
2354 if (tc < 0) tc = '?';
2355 }
2356 }
d4328b40 2357 }
1da177e4 2358
2f1a2ccb
EK		 2359 if (!inverse) {
2360 vc_attr = vc->vc_attr;
1da177e4 2361 } else {
2f1a2ccb
EK		 2362 /* invert vc_attr */
2363 if (!vc->vc_can_do_color) {
2364 vc_attr = (vc->vc_attr) ^ 0x08;
2365 } else if (vc->vc_hi_font_mask == 0x100) {
2366 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2367 } else {
2368 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2369 }
1ed8a2b3 2370 FLUSH
1da177e4 2371 }
2f1a2ccb
EK		 2372
2373 while (1) {
2374 if (vc->vc_need_wrap || vc->vc_decim)
2375 FLUSH
2376 if (vc->vc_need_wrap) {
2377 cr(vc);
2378 lf(vc);
2379 }
2380 if (vc->vc_decim)
2381 insert_char(vc, 1);
2382 scr_writew(himask ?
2383 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2384 (vc_attr << 8) + tc,
2385 (u16 *) vc->vc_pos);
2386 if (DO_UPDATE(vc) && draw_x < 0) {
2387 draw_x = vc->vc_x;
2388 draw_from = vc->vc_pos;
2389 }
2390 if (vc->vc_x == vc->vc_cols - 1) {
2391 vc->vc_need_wrap = vc->vc_decawm;
2392 draw_to = vc->vc_pos + 2;
2393 } else {
2394 vc->vc_x++;
2395 draw_to = (vc->vc_pos += 2);
d4328b40 2396 }
2f1a2ccb
EK		 2397
2398 if (!--width) break;
2399
2400 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2401 if (tc < 0) tc = ' ';
2402 }
b293d758 2403 notify_write(vc, c);
2f1a2ccb 2404
1ed8a2b3
EK		 2405 if (inverse) {
2406 FLUSH
2407 }
2408
2f1a2ccb
EK		 2409 if (rescan) {
2410 rescan = 0;
2411 inverse = 0;
2412 width = 1;
d4328b40
AT		 2413 c = orig;
2414 goto rescan_last_byte;
2415 }
1da177e4
LT		 2416 continue;
2417 }
2418 FLUSH
2419 do_con_trol(tty, vc, orig);
2420 }
2421 FLUSH
2422 console_conditional_schedule();
ac751efa 2423 console_unlock();
b293d758 2424 notify_update(vc);
1da177e4
LT		 2425 return n;
2426#undef FLUSH
2427}
2428
2429/*
2430 * This is the console switching callback.
2431 *
2432 * Doing console switching in a process context allows
2433 * us to do the switches asynchronously (needed when we want
2434 * to switch due to a keyboard interrupt). Synchronization
2435 * with other console code and prevention of re-entrancy is
ac751efa 2436 * ensured with console_lock.
1da177e4 2437 */
65f27f38 2438static void console_callback(struct work_struct *ignored)
1da177e4 2439{
ac751efa 2440 console_lock();
1da177e4
LT		 2441
2442 if (want_console >= 0) {
2443 if (want_console != fg_console &&
2444 vc_cons_allocated(want_console)) {
2445 hide_cursor(vc_cons[fg_console].d);
2446 change_console(vc_cons[want_console].d);
2447 /* we only changed when the console had already
2448 been allocated - a new console is not created
2449 in an interrupt routine */
2450 }
2451 want_console = -1;
2452 }
2453 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2454 do_poke_blanked_console = 0;
2455 poke_blanked_console();
2456 }
2457 if (scrollback_delta) {
2458 struct vc_data *vc = vc_cons[fg_console].d;
2459 clear_selection();
2460 if (vc->vc_mode == KD_TEXT)
2461 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2462 scrollback_delta = 0;
2463 }
2464 if (blank_timer_expired) {
2465 do_blank_screen(0);
2466 blank_timer_expired = 0;
2467 }
b293d758 2468 notify_update(vc_cons[fg_console].d);
1da177e4 2469
ac751efa 2470 console_unlock();
1da177e4
LT		 2471}
2472
b257bc05 2473int set_console(int nr)
1da177e4 2474{
b257bc05
AJ		 2475 struct vc_data *vc = vc_cons[fg_console].d;
2476
2477 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2478 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2479
2480 /*
2481 * Console switch will fail in console_callback() or
2482 * change_console() so there is no point scheduling
2483 * the callback
2484 *
2485 * Existing set_console() users don't check the return
2486 * value so this shouldn't break anything
2487 */
2488 return -EINVAL;
2489 }
2490
1da177e4
LT		 2491 want_console = nr;
2492 schedule_console_callback();
b257bc05
AJ		 2493
2494 return 0;
1da177e4
LT		 2495}
2496
2497struct tty_driver *console_driver;
2498
2499#ifdef CONFIG_VT_CONSOLE
2500
5ada918b
BW		 2501/**
2502 * vt_kmsg_redirect() - Sets/gets the kernel message console
2503 * @new: The new virtual terminal number or -1 if the console should stay
2504 * unchanged
2505 *
2506 * By default, the kernel messages are always printed on the current virtual
2507 * console. However, the user may modify that default with the
2508 * TIOCL_SETKMSGREDIRECT ioctl call.
2509 *
2510 * This function sets the kernel message console to be @new. It returns the old
2511 * virtual console number. The virtual terminal number 0 (both as parameter and
2512 * return value) means no redirection (i.e. always printed on the currently
2513 * active console).
2514 *
2515 * The parameter -1 means that only the current console is returned, but the
2516 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2517 * case to make the code more understandable.
2518 *
2519 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2520 * the parameter and always returns 0.
2521 */
2522int vt_kmsg_redirect(int new)
2523{
2524 static int kmsg_con;
2525
2526 if (new != -1)
2527 return xchg(&kmsg_con, new);
2528 else
2529 return kmsg_con;
2530}
2531
1da177e4
LT		 2532/*
2533 * Console on virtual terminal
2534 *
2535 * The console must be locked when we get here.
2536 */
2537
2538static void vt_console_print(struct console *co, const char *b, unsigned count)
2539{
2540 struct vc_data *vc = vc_cons[fg_console].d;
2541 unsigned char c;
b0940003 2542 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2543 const ushort *start;
2544 ushort cnt = 0;
2545 ushort myx;
5ada918b 2546 int kmsg_console;
1da177e4
LT		 2547
2548 /* console busy or not yet initialized */
b0940003
NP		 2549 if (!printable)
2550 return;
2551 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2552 return;
2553
5ada918b
BW		 2554 kmsg_console = vt_get_kmsg_redirect();
2555 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2556 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2557
2558 /* read `x' only after setting currcons properly (otherwise
2559 the `x' macro will read the x of the foreground console). */
2560 myx = vc->vc_x;
2561
2562 if (!vc_cons_allocated(fg_console)) {
2563 /* impossible */
2564 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2565 goto quit;
2566 }
2567
8fd4bd22 2568 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2569 goto quit;
2570
2571 /* undraw cursor first */
2572 if (IS_FG(vc))
2573 hide_cursor(vc);
2574
2575 start = (ushort *)vc->vc_pos;
2576
2577 /* Contrived structure to try to emulate original need_wrap behaviour
2578 * Problems caused when we have need_wrap set on '\n' character */
2579 while (count--) {
2580 c = *b++;
2581 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2582 if (cnt > 0) {
2583 if (CON_IS_VISIBLE(vc))
2584 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2585 vc->vc_x += cnt;
2586 if (vc->vc_need_wrap)
2587 vc->vc_x--;
2588 cnt = 0;
2589 }
2590 if (c == 8) { /* backspace */
2591 bs(vc);
2592 start = (ushort *)vc->vc_pos;
2593 myx = vc->vc_x;
2594 continue;
2595 }
2596 if (c != 13)
2597 lf(vc);
2598 cr(vc);
2599 start = (ushort *)vc->vc_pos;
2600 myx = vc->vc_x;
2601 if (c == 10 || c == 13)
2602 continue;
2603 }
2604 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2605 notify_write(vc, c);
1da177e4
LT		 2606 cnt++;
2607 if (myx == vc->vc_cols - 1) {
2608 vc->vc_need_wrap = 1;
2609 continue;
2610 }
2611 vc->vc_pos += 2;
2612 myx++;
2613 }
2614 if (cnt > 0) {
2615 if (CON_IS_VISIBLE(vc))
2616 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2617 vc->vc_x += cnt;
2618 if (vc->vc_x == vc->vc_cols) {
2619 vc->vc_x--;
2620 vc->vc_need_wrap = 1;
2621 }
2622 }
2623 set_cursor(vc);
b293d758 2624 notify_update(vc);
1da177e4
LT		 2625
2626quit:
b0940003 2627 spin_unlock(&printing_lock);
1da177e4
LT		 2628}
2629
2630static struct tty_driver *vt_console_device(struct console *c, int *index)
2631{
2632 *index = c->index ? c->index-1 : fg_console;
2633 return console_driver;
2634}
2635
2636static struct console vt_console_driver = {
2637 .name = "tty",
2638 .write = vt_console_print,
2639 .device = vt_console_device,
2640 .unblank = unblank_screen,
2641 .flags = CON_PRINTBUFFER,
2642 .index = -1,
2643};
2644#endif
2645
2646/*
2647 * Handling of Linux-specific VC ioctls
2648 */
2649
2650/*
ac751efa 2651 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2652 *
2653 * There are some functions which don't need it.
2654 *
2655 * There are some functions which can sleep for arbitrary periods
2656 * (paste_selection) but we don't need the lock there anyway.
2657 *
2658 * set_selection has locking, and definitely needs it
2659 */
2660
2661int tioclinux(struct tty_struct *tty, unsigned long arg)
2662{
2663 char type, data;
2664 char __user *p = (char __user *)arg;
2665 int lines;
2666 int ret;
2667
1da177e4
LT		 2668 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2669 return -EPERM;
2670 if (get_user(type, p))
2671 return -EFAULT;
2672 ret = 0;
04f378b1 2673
1da177e4
LT		 2674 switch (type)
2675 {
2676 case TIOCL_SETSEL:
ac751efa 2677 console_lock();
1da177e4 2678 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2679 console_unlock();
1da177e4
LT		 2680 break;
2681 case TIOCL_PASTESEL:
2682 ret = paste_selection(tty);
2683 break;
2684 case TIOCL_UNBLANKSCREEN:
ac751efa 2685 console_lock();
1da177e4 2686 unblank_screen();
ac751efa 2687 console_unlock();
1da177e4
LT		 2688 break;
2689 case TIOCL_SELLOADLUT:
5289475d 2690 console_lock();
1da177e4 2691 ret = sel_loadlut(p);
5289475d 2692 console_unlock();
1da177e4
LT		 2693 break;
2694 case TIOCL_GETSHIFTSTATE:
04f378b1 2695
1da177e4
LT		 2696 /*
2697 * Make it possible to react to Shift+Mousebutton.
2698 * Note that 'shift_state' is an undocumented
2699 * kernel-internal variable; programs not closely
2700 * related to the kernel should not use this.
2701 */
079c9534 2702 data = vt_get_shift_state();
1da177e4
LT		 2703 ret = __put_user(data, p);
2704 break;
2705 case TIOCL_GETMOUSEREPORTING:
20f62579 2706 console_lock(); /* May be overkill */
1da177e4 2707 data = mouse_reporting();
20f62579 2708 console_unlock();
1da177e4
LT		 2709 ret = __put_user(data, p);
2710 break;
2711 case TIOCL_SETVESABLANK:
20f62579 2712 console_lock();
403aac96 2713 ret = set_vesa_blanking(p);
20f62579 2714 console_unlock();
1da177e4 2715 break;
0ca07731 2716 case TIOCL_GETKMSGREDIRECT:
5ada918b 2717 data = vt_get_kmsg_redirect();
0ca07731
RW		 2718 ret = __put_user(data, p);
2719 break;
1da177e4
LT		 2720 case TIOCL_SETKMSGREDIRECT:
2721 if (!capable(CAP_SYS_ADMIN)) {
2722 ret = -EPERM;
2723 } else {
2724 if (get_user(data, p+1))
2725 ret = -EFAULT;
2726 else
5ada918b 2727 vt_kmsg_redirect(data);
1da177e4
LT		 2728 }
2729 break;
2730 case TIOCL_GETFGCONSOLE:
20f62579
AC		 2731 /* No locking needed as this is a transiently
2732 correct return anyway if the caller hasn't
2733 disabled switching */
1da177e4
LT		 2734 ret = fg_console;
2735 break;
2736 case TIOCL_SCROLLCONSOLE:
2737 if (get_user(lines, (s32 __user *)(p+4))) {
2738 ret = -EFAULT;
2739 } else {
20f62579
AC		 2740 /* Need the console lock here. Note that lots
2741 of other calls need fixing before the lock
2742 is actually useful ! */
2743 console_lock();
1da177e4 2744 scrollfront(vc_cons[fg_console].d, lines);
20f62579 2745 console_unlock();
1da177e4
LT		 2746 ret = 0;
2747 }
2748 break;
2749 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2750 console_lock();
1da177e4
LT		 2751 ignore_poke = 1;
2752 do_blank_screen(0);
ac751efa 2753 console_unlock();
1da177e4
LT		 2754 break;
2755 case TIOCL_BLANKEDSCREEN:
2756 ret = console_blanked;
2757 break;
2758 default:
2759 ret = -EINVAL;
2760 break;
2761 }
2762 return ret;
2763}
2764
2765/*
2766 * /dev/ttyN handling
2767 */
2768
2769static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2770{
2771 int retval;
2772
2773 retval = do_con_write(tty, buf, count);
2774 con_flush_chars(tty);
2775
2776 return retval;
2777}
2778
5d19f546 2779static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2780{
2781 if (in_interrupt())
5d19f546
AC		 2782 return 0; /* n_r3964 calls put_char() from interrupt context */
2783 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2784}
2785
2786static int con_write_room(struct tty_struct *tty)
2787{
2788 if (tty->stopped)
2789 return 0;
a88a69c9 2790 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2791}
2792
2793static int con_chars_in_buffer(struct tty_struct *tty)
2794{
2795 return 0; /* we're not buffering */
2796}
2797
2798/*
2799 * con_throttle and con_unthrottle are only used for
2800 * paste_selection(), which has to stuff in a large number of
2801 * characters...
2802 */
2803static void con_throttle(struct tty_struct *tty)
2804{
2805}
2806
2807static void con_unthrottle(struct tty_struct *tty)
2808{
2809 struct vc_data *vc = tty->driver_data;
2810
2811 wake_up_interruptible(&vc->paste_wait);
2812}
2813
2814/*
2815 * Turn the Scroll-Lock LED on when the tty is stopped
2816 */
2817static void con_stop(struct tty_struct *tty)
2818{
2819 int console_num;
2820 if (!tty)
2821 return;
2822 console_num = tty->index;
2823 if (!vc_cons_allocated(console_num))
2824 return;
079c9534 2825 vt_kbd_con_stop(console_num);
1da177e4
LT		 2826}
2827
2828/*
2829 * Turn the Scroll-Lock LED off when the console is started
2830 */
2831static void con_start(struct tty_struct *tty)
2832{
2833 int console_num;
2834 if (!tty)
2835 return;
2836 console_num = tty->index;
2837 if (!vc_cons_allocated(console_num))
2838 return;
079c9534 2839 vt_kbd_con_start(console_num);
1da177e4
LT		 2840}
2841
2842static void con_flush_chars(struct tty_struct *tty)
2843{
2844 struct vc_data *vc;
2845
2846 if (in_interrupt()) /* from flush_to_ldisc */
2847 return;
2848
2849 /* if we race with con_close(), vt may be null */
ac751efa 2850 console_lock();
1da177e4
LT		 2851 vc = tty->driver_data;
2852 if (vc)
2853 set_cursor(vc);
ac751efa 2854 console_unlock();
1da177e4
LT		 2855}
2856
2857/*
2858 * Allocate the console screen memory.
2859 */
bc1e99d9 2860static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 2861{
2862 unsigned int currcons = tty->index;
bc1e99d9
JS		 2863 struct vc_data *vc;
2864 int ret;
1da177e4 2865
ac751efa 2866 console_lock();
bc1e99d9
JS		 2867 ret = vc_allocate(currcons);
2868 if (ret)
2869 goto unlock;
feebed65 2870
bc1e99d9 2871 vc = vc_cons[currcons].d;
1da177e4 2872
bc1e99d9
JS		 2873 /* Still being freed */
2874 if (vc->port.tty) {
2875 ret = -ERESTARTSYS;
2876 goto unlock;
2877 }
2878
2879 ret = tty_port_install(&vc->port, driver, tty);
2880 if (ret)
2881 goto unlock;
2882
2883 tty->driver_data = vc;
2884 vc->port.tty = tty;
2885
2886 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2887 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2888 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 2889 }
bc1e99d9 2890 if (vc->vc_utf)
adc8d746 2891 tty->termios.c_iflag |= IUTF8;
bc1e99d9 2892 else
adc8d746 2893 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 2894unlock:
ac751efa 2895 console_unlock();
1da177e4
LT		 2896 return ret;
2897}
2898
bc1e99d9
JS		 2899static int con_open(struct tty_struct *tty, struct file *filp)
2900{
2901 /* everything done in install */
2902 return 0;
2903}
2904
2905
1da177e4
LT		 2906static void con_close(struct tty_struct *tty, struct file *filp)
2907{
feebed65
AC		 2908 /* Nothing to do - we defer to shutdown */
2909}
1da177e4 2910
feebed65
AC		 2911static void con_shutdown(struct tty_struct *tty)
2912{
2913 struct vc_data *vc = tty->driver_data;
2914 BUG_ON(vc == NULL);
ac751efa 2915 console_lock();
8ce73264 2916 vc->port.tty = NULL;
ac751efa 2917 console_unlock();
1da177e4
LT		 2918}
2919
3855ae1c 2920static int default_color = 7; /* white */
fa6ce9ab
JE		 2921static int default_italic_color = 2; // green (ASCII)
2922static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 2923module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 2924module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2925module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2926
1da177e4
LT		 2927static void vc_init(struct vc_data *vc, unsigned int rows,
2928 unsigned int cols, int do_clear)
2929{
2930 int j, k ;
2931
2932 vc->vc_cols = cols;
2933 vc->vc_rows = rows;
2934 vc->vc_size_row = cols << 1;
2935 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2936
2937 set_origin(vc);
2938 vc->vc_pos = vc->vc_origin;
2939 reset_vc(vc);
2940 for (j=k=0; j<16; j++) {
2941 vc->vc_palette[k++] = default_red[j] ;
2942 vc->vc_palette[k++] = default_grn[j] ;
2943 vc->vc_palette[k++] = default_blu[j] ;
2944 }
3855ae1c 2945 vc->vc_def_color = default_color;
fa6ce9ab
JE		 2946 vc->vc_ulcolor = default_underline_color;
2947 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2948 vc->vc_halfcolor = 0x08; /* grey */
2949 init_waitqueue_head(&vc->paste_wait);
2950 reset_terminal(vc, do_clear);
2951}
2952
2953/*
2954 * This routine initializes console interrupts, and does nothing
2955 * else. If you want the screen to clear, call tty_write with
2956 * the appropriate escape-sequence.
2957 */
2958
2959static int __init con_init(void)
2960{
2961 const char *display_desc = NULL;
2962 struct vc_data *vc;
3e795de7 2963 unsigned int currcons = 0, i;
1da177e4 2964
ac751efa 2965 console_lock();
1da177e4
LT		 2966
2967 if (conswitchp)
2968 display_desc = conswitchp->con_startup();
2969 if (!display_desc) {
2970 fg_console = 0;
ac751efa 2971 console_unlock();
1da177e4
LT		 2972 return 0;
2973 }
2974
3e795de7
AD		 2975 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2976 struct con_driver *con_driver = &registered_con_driver[i];
2977
2978 if (con_driver->con == NULL) {
2979 con_driver->con = conswitchp;
2980 con_driver->desc = display_desc;
2981 con_driver->flag = CON_DRIVER_FLAG_INIT;
2982 con_driver->first = 0;
2983 con_driver->last = MAX_NR_CONSOLES - 1;
2984 break;
2985 }
2986 }
2987
2988 for (i = 0; i < MAX_NR_CONSOLES; i++)
2989 con_driver_map[i] = conswitchp;
2990
1da177e4
LT		 2991 if (blankinterval) {
2992 blank_state = blank_normal_wait;
f324edc8 2993 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2994 }
2995
1da177e4 2996 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2997 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2998 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 2999 tty_port_init(&vc->port);
1da177e4 3000 visual_init(vc, currcons, 1);
a5f4f52e 3001 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 3002 vc_init(vc, vc->vc_rows, vc->vc_cols,
3003 currcons || !vc->vc_sw->con_save_screen);
3004 }
3005 currcons = fg_console = 0;
3006 master_display_fg = vc = vc_cons[currcons].d;
3007 set_origin(vc);
3008 save_screen(vc);
3009 gotoxy(vc, vc->vc_x, vc->vc_y);
3010 csi_J(vc, 0);
3011 update_screen(vc);
5da527aa 3012 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3013 vc->vc_can_do_color ? "colour" : "mono",
3014 display_desc, vc->vc_cols, vc->vc_rows);
3015 printable = 1;
1da177e4 3016
ac751efa 3017 console_unlock();
1da177e4
LT		 3018
3019#ifdef CONFIG_VT_CONSOLE
3020 register_console(&vt_console_driver);
3021#endif
3022 return 0;
3023}
3024console_initcall(con_init);
3025
b68e31d0 3026static const struct tty_operations con_ops = {
bc1e99d9 3027 .install = con_install,
1da177e4
LT		 3028 .open = con_open,
3029 .close = con_close,
3030 .write = con_write,
3031 .write_room = con_write_room,
3032 .put_char = con_put_char,
3033 .flush_chars = con_flush_chars,
3034 .chars_in_buffer = con_chars_in_buffer,
3035 .ioctl = vt_ioctl,
e9216651
AB		 3036#ifdef CONFIG_COMPAT
3037 .compat_ioctl = vt_compat_ioctl,
3038#endif
1da177e4
LT		 3039 .stop = con_stop,
3040 .start = con_start,
3041 .throttle = con_throttle,
3042 .unthrottle = con_unthrottle,
8c9a9dd0 3043 .resize = vt_resize,
feebed65 3044 .shutdown = con_shutdown
1da177e4
LT		 3045};
3046
d81ed103
AC		 3047static struct cdev vc0_cdev;
3048
fbc92a34
KS		 3049static ssize_t show_tty_active(struct device *dev,
3050 struct device_attribute *attr, char *buf)
3051{
3052 return sprintf(buf, "tty%d\n", fg_console + 1);
3053}
3054static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3055
1083a7be
TI		 3056static struct attribute *vt_dev_attrs[] = {
3057 &dev_attr_active.attr,
3058 NULL
3059};
3060
3061ATTRIBUTE_GROUPS(vt_dev);
3062
d81ed103 3063int __init vty_init(const struct file_operations *console_fops)
1da177e4 3064{
d81ed103
AC		 3065 cdev_init(&vc0_cdev, console_fops);
3066 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3067 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3068 panic("Couldn't register /dev/tty0 driver\n");
1083a7be
TI		 3069 tty0dev = device_create_with_groups(tty_class, NULL,
3070 MKDEV(TTY_MAJOR, 0), NULL,
3071 vt_dev_groups, "tty0");
fbc92a34
KS		 3072 if (IS_ERR(tty0dev))
3073 tty0dev = NULL;
d81ed103 3074
1da177e4
LT		 3075 vcs_init();
3076
3077 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3078 if (!console_driver)
3079 panic("Couldn't allocate console driver\n");
2f16669d 3080
1da177e4
LT		 3081 console_driver->name = "tty";
3082 console_driver->name_base = 1;
3083 console_driver->major = TTY_MAJOR;
3084 console_driver->minor_start = 1;
3085 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3086 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3087 if (default_utf8)
3088 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3089 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3090 tty_set_operations(console_driver, &con_ops);
3091 if (tty_register_driver(console_driver))
3092 panic("Couldn't register console driver\n");
1da177e4
LT		 3093 kbd_init();
3094 console_map_init();
1da177e4
LT		 3095#ifdef CONFIG_MDA_CONSOLE
3096 mda_console_init();
3097#endif
3098 return 0;
3099}
3100
3101#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3102
3103static struct class *vtconsole_class;
3104
50e244cc 3105static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3106 int deflt)
1da177e4 3107{
3e795de7
AD		 3108 struct module *owner = csw->owner;
3109 const char *desc = NULL;
3110 struct con_driver *con_driver;
3111 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3112
1da177e4
LT		 3113 if (!try_module_get(owner))
3114 return -ENODEV;
3115
50e244cc 3116 WARN_CONSOLE_UNLOCKED();
1c8ce271 3117
3e795de7
AD		 3118 /* check if driver is registered */
3119 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3120 con_driver = &registered_con_driver[i];
3121
3122 if (con_driver->con == csw) {
3123 desc = con_driver->desc;
3124 retval = 0;
3125 break;
3126 }
3127 }
3128
3129 if (retval)
3130 goto err;
3131
3132 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3133 csw->con_startup();
3134 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3135 }
1c8ce271 3136
1da177e4
LT		 3137 if (deflt) {
3138 if (conswitchp)
3139 module_put(conswitchp->owner);
1c8ce271 3140
1da177e4
LT		 3141 __module_get(owner);
3142 conswitchp = csw;
3143 }
3144
3e795de7
AD		 3145 first = max(first, con_driver->first);
3146 last = min(last, con_driver->last);
3147
1da177e4
LT		 3148 for (i = first; i <= last; i++) {
3149 int old_was_color;
3150 struct vc_data *vc = vc_cons[i].d;
3151
3152 if (con_driver_map[i])
3153 module_put(con_driver_map[i]->owner);
3154 __module_get(owner);
3155 con_driver_map[i] = csw;
3156
3157 if (!vc || !vc->vc_sw)
3158 continue;
3159
3160 j = i;
1c8ce271 3161
4ee1acce
DH		 3162 if (CON_IS_VISIBLE(vc)) {
3163 k = i;
1da177e4 3164 save_screen(vc);
4ee1acce
DH		 3165 }
3166
1da177e4
LT		 3167 old_was_color = vc->vc_can_do_color;
3168 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3169 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3170 visual_init(vc, i, 0);
1c8ce271 3171 set_origin(vc);
1da177e4
LT		 3172 update_attr(vc);
3173
3174 /* If the console changed between mono <-> color, then
3175 * the attributes in the screenbuf will be wrong. The
3176 * following resets all attributes to something sane.
3177 */
3178 if (old_was_color != vc->vc_can_do_color)
3179 clear_buffer_attributes(vc);
1da177e4 3180 }
4ee1acce 3181
1ffdda95 3182 pr_info("Console: switching ");
1da177e4
LT		 3183 if (!deflt)
3184 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3185 if (j >= 0) {
3186 struct vc_data *vc = vc_cons[j].d;
3187
1da177e4 3188 printk("to %s %s %dx%d\n",
4ee1acce
DH		 3189 vc->vc_can_do_color ? "colour" : "mono",
3190 desc, vc->vc_cols, vc->vc_rows);
3191
3192 if (k >= 0) {
3193 vc = vc_cons[k].d;
3194 update_screen(vc);
3195 }
3196 } else
1da177e4
LT		 3197 printk("to %s\n", desc);
3198
3e795de7
AD		 3199 retval = 0;
3200err:
1da177e4 3201 module_put(owner);
3e795de7
AD		 3202 return retval;
3203};
1da177e4 3204
50e244cc 3205
13ae6645
AD		 3206#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3207static int con_is_graphics(const struct consw *csw, int first, int last)
3208{
3209 int i, retval = 0;
3210
3211 for (i = first; i <= last; i++) {
3212 struct vc_data *vc = vc_cons[i].d;
3213
3214 if (vc && vc->vc_mode == KD_GRAPHICS) {
3215 retval = 1;
3216 break;
3217 }
3218 }
3219
3220 return retval;
3221}
3222
e93a9a86
TI		 3223/* unlocked version of unbind_con_driver() */
3224int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3225{
3e795de7
AD		 3226 struct module *owner = csw->owner;
3227 const struct consw *defcsw = NULL;
3228 struct con_driver *con_driver = NULL, *con_back = NULL;
3229 int i, retval = -ENODEV;
1da177e4 3230
3e795de7
AD		 3231 if (!try_module_get(owner))
3232 return -ENODEV;
3233
e93a9a86 3234 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3235
3236 /* check if driver is registered and if it is unbindable */
3237 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3238 con_driver = &registered_con_driver[i];
3239
3240 if (con_driver->con == csw &&
6db4063c 3241 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3242 retval = 0;
3243 break;
3244 }
3245 }
3246
e93a9a86 3247 if (retval)
3e795de7 3248 goto err;
3e795de7 3249
6db4063c
AD		 3250 retval = -ENODEV;
3251
3e795de7
AD		 3252 /* check if backup driver exists */
3253 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3254 con_back = &registered_con_driver[i];
3255
249f7b3e 3256 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3257 defcsw = con_back->con;
3258 retval = 0;
3259 break;
3260 }
3261 }
3262
e93a9a86 3263 if (retval)
3e795de7 3264 goto err;
3e795de7 3265
e93a9a86 3266 if (!con_is_bound(csw))
3e795de7 3267 goto err;
3e795de7
AD		 3268
3269 first = max(first, con_driver->first);
3270 last = min(last, con_driver->last);
3271
3272 for (i = first; i <= last; i++) {
1da177e4
LT		 3273 if (con_driver_map[i] == csw) {
3274 module_put(csw->owner);
3275 con_driver_map[i] = NULL;
3276 }
3e795de7
AD		 3277 }
3278
3279 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3280 const struct consw *defconsw = conswitchp;
3281
3e795de7
AD		 3282 defcsw->con_startup();
3283 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3284 /*
3285 * vgacon may change the default driver to point
3286 * to dummycon, we restore it here...
3287 */
3288 conswitchp = defconsw;
3e795de7
AD		 3289 }
3290
3291 if (!con_is_bound(csw))
3292 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3293
6db4063c 3294 /* ignore return value, binding should not fail */
50e244cc 3295 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3296err:
3297 module_put(owner);
3298 return retval;
3299
3300}
e93a9a86 3301EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3302
6db4063c
AD		 3303static int vt_bind(struct con_driver *con)
3304{
3305 const struct consw *defcsw = NULL, *csw = NULL;
3306 int i, more = 1, first = -1, last = -1, deflt = 0;
3307
3308 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3309 con_is_graphics(con->con, con->first, con->last))
3310 goto err;
3311
3312 csw = con->con;
3313
3314 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3315 struct con_driver *con = &registered_con_driver[i];
3316
3317 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3318 defcsw = con->con;
3319 break;
3320 }
3321 }
3322
3323 if (!defcsw)
3324 goto err;
3325
3326 while (more) {
3327 more = 0;
3328
3329 for (i = con->first; i <= con->last; i++) {
3330 if (con_driver_map[i] == defcsw) {
3331 if (first == -1)
3332 first = i;
3333 last = i;
3334 more = 1;
3335 } else if (first != -1)
3336 break;
3337 }
3338
3339 if (first == 0 && last == MAX_NR_CONSOLES -1)
3340 deflt = 1;
3341
4c215fe8 3342 if (first != -1)
c62a1e57 3343 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3344
3345 first = -1;
3346 last = -1;
3347 deflt = 0;
3348 }
3349
3350err:
3351 return 0;
3352}
3353
3354static int vt_unbind(struct con_driver *con)
3355{
3356 const struct consw *csw = NULL;
3357 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3358 int ret;
6db4063c
AD		 3359
3360 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3361 con_is_graphics(con->con, con->first, con->last))
3362 goto err;
3363
3364 csw = con->con;
3365
3366 while (more) {
3367 more = 0;
3368
3369 for (i = con->first; i <= con->last; i++) {
3370 if (con_driver_map[i] == csw) {
3371 if (first == -1)
3372 first = i;
3373 last = i;
3374 more = 1;
3375 } else if (first != -1)
3376 break;
3377 }
3378
3379 if (first == 0 && last == MAX_NR_CONSOLES -1)
3380 deflt = 1;
3381
618f2b90 3382 if (first != -1) {
f418f2ec 3383 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3384 if (ret != 0)
3385 return ret;
618f2b90 3386 }
6db4063c
AD		 3387
3388 first = -1;
3389 last = -1;
3390 deflt = 0;
3391 }
3392
3393err:
3394 return 0;
3395}
13ae6645
AD		 3396#else
3397static inline int vt_bind(struct con_driver *con)
3398{
3399 return 0;
3400}
3401static inline int vt_unbind(struct con_driver *con)
3402{
3403 return 0;
3404}
3405#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3406
805952a8 3407static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3408 const char *buf, size_t count)
3409{
805952a8 3410 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3411 int bind = simple_strtoul(buf, NULL, 0);
3412
4c215fe8
ID		 3413 console_lock();
3414
6db4063c
AD		 3415 if (bind)
3416 vt_bind(con);
3417 else
3418 vt_unbind(con);
3419
4c215fe8
ID		 3420 console_unlock();
3421
6db4063c
AD		 3422 return count;
3423}
3424
805952a8
GKH		 3425static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3426 char *buf)
6db4063c 3427{
805952a8 3428 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3429 int bind = con_is_bound(con->con);
3430
3431 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3432}
3433
805952a8
GKH		 3434static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3435 char *buf)
6db4063c 3436{
805952a8 3437 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3438
3439 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3440 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3441 con->desc);
3442
3443}
3444
1083a7be
TI		 3445static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3446static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3447
3448static struct attribute *con_dev_attrs[] = {
3449 &dev_attr_bind.attr,
3450 &dev_attr_name.attr,
3451 NULL
6db4063c
AD		 3452};
3453
1083a7be
TI		 3454ATTRIBUTE_GROUPS(con_dev);
3455
805952a8 3456static int vtconsole_init_device(struct con_driver *con)
6db4063c 3457{
928e964f 3458 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3459 return 0;
6db4063c
AD		 3460}
3461
805952a8 3462static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3463{
1083a7be 3464 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3465}
3466
3e795de7
AD		 3467/**
3468 * con_is_bound - checks if driver is bound to the console
3469 * @csw: console driver
3470 *
3471 * RETURNS: zero if unbound, nonzero if bound
3472 *
3473 * Drivers can call this and if zero, they should release
3474 * all resources allocated on con_startup()
3475 */
3476int con_is_bound(const struct consw *csw)
3477{
3478 int i, bound = 0;
3479
3480 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3481 if (con_driver_map[i] == csw) {
3482 bound = 1;
3483 break;
3484 }
3485 }
3486
3487 return bound;
3488}
3489EXPORT_SYMBOL(con_is_bound);
3490
b45cfba4
JB		 3491/**
3492 * con_debug_enter - prepare the console for the kernel debugger
3493 * @sw: console driver
3494 *
3495 * Called when the console is taken over by the kernel debugger, this
3496 * function needs to save the current console state, then put the console
3497 * into a state suitable for the kernel debugger.
3498 *
3499 * RETURNS:
3500 * Zero on success, nonzero if a failure occurred when trying to prepare
3501 * the console for the debugger.
3502 */
3503int con_debug_enter(struct vc_data *vc)
3504{
3505 int ret = 0;
3506
3507 saved_fg_console = fg_console;
3508 saved_last_console = last_console;
3509 saved_want_console = want_console;
3510 saved_vc_mode = vc->vc_mode;
beed5336 3511 saved_console_blanked = console_blanked;
b45cfba4
JB		 3512 vc->vc_mode = KD_TEXT;
3513 console_blanked = 0;
3514 if (vc->vc_sw->con_debug_enter)
3515 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3516#ifdef CONFIG_KGDB_KDB
3517 /* Set the initial LINES variable if it is not already set */
3518 if (vc->vc_rows < 999) {
3519 int linecount;
3520 char lns[4];
3521 const char *setargs[3] = {
3522 "set",
3523 "LINES",
3524 lns,
3525 };
3526 if (kdbgetintenv(setargs[0], &linecount)) {
3527 snprintf(lns, 4, "%i", vc->vc_rows);
3528 kdb_set(2, setargs);
3529 }
3530 }
17b572e8
JW		 3531 if (vc->vc_cols < 999) {
3532 int colcount;
3533 char cols[4];
3534 const char *setargs[3] = {
3535 "set",
3536 "COLUMNS",
3537 cols,
3538 };
3539 if (kdbgetintenv(setargs[0], &colcount)) {
3540 snprintf(cols, 4, "%i", vc->vc_cols);
3541 kdb_set(2, setargs);
3542 }
3543 }
81d44507 3544#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3545 return ret;
3546}
3547EXPORT_SYMBOL_GPL(con_debug_enter);
3548
3549/**
3550 * con_debug_leave - restore console state
3551 * @sw: console driver
3552 *
3553 * Restore the console state to what it was before the kernel debugger
3554 * was invoked.
3555 *
3556 * RETURNS:
3557 * Zero on success, nonzero if a failure occurred when trying to restore
3558 * the console.
3559 */
3560int con_debug_leave(void)
3561{
3562 struct vc_data *vc;
3563 int ret = 0;
3564
3565 fg_console = saved_fg_console;
3566 last_console = saved_last_console;
3567 want_console = saved_want_console;
beed5336 3568 console_blanked = saved_console_blanked;
b45cfba4
JB		 3569 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3570
3571 vc = vc_cons[fg_console].d;
3572 if (vc->vc_sw->con_debug_leave)
3573 ret = vc->vc_sw->con_debug_leave(vc);
3574 return ret;
3575}
3576EXPORT_SYMBOL_GPL(con_debug_leave);
3577
50e244cc 3578static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 3579{
3580 struct module *owner = csw->owner;
3581 struct con_driver *con_driver;
3582 const char *desc;
3583 int i, retval = 0;
3584
50e244cc
AC		 3585 WARN_CONSOLE_UNLOCKED();
3586
3e795de7
AD		 3587 if (!try_module_get(owner))
3588 return -ENODEV;
3589
3e795de7
AD		 3590 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3591 con_driver = &registered_con_driver[i];
3592
3593 /* already registered */
3594 if (con_driver->con == csw)
c55c63c6 3595 retval = -EBUSY;
3e795de7
AD		 3596 }
3597
3598 if (retval)
3599 goto err;
3600
3601 desc = csw->con_startup();
3602
3603 if (!desc)
3604 goto err;
3605
3606 retval = -EINVAL;
3607
3608 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3609 con_driver = &registered_con_driver[i];
3610
d364b5c3
ID		 3611 if (con_driver->con == NULL &&
3612 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 3613 con_driver->con = csw;
3614 con_driver->desc = desc;
6db4063c
AD		 3615 con_driver->node = i;
3616 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3617 CON_DRIVER_FLAG_INIT;
3618 con_driver->first = first;
3619 con_driver->last = last;
3620 retval = 0;
3621 break;
3622 }
3623 }
3624
6db4063c
AD		 3625 if (retval)
3626 goto err;
3627
1083a7be
TI		 3628 con_driver->dev =
3629 device_create_with_groups(vtconsole_class, NULL,
3630 MKDEV(0, con_driver->node),
3631 con_driver, con_dev_groups,
3632 "vtcon%i", con_driver->node);
805952a8
GKH		 3633 if (IS_ERR(con_driver->dev)) {
3634 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3635 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3636 PTR_ERR(con_driver->dev));
3637 con_driver->dev = NULL;
6db4063c 3638 } else {
805952a8 3639 vtconsole_init_device(con_driver);
6db4063c 3640 }
928e964f 3641
3e795de7 3642err:
3e795de7
AD		 3643 module_put(owner);
3644 return retval;
3645}
50e244cc 3646
3e795de7
AD		 3647
3648/**
50539dd4 3649 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 3650 * @csw: console driver
3651 *
3652 * DESCRIPTION: All drivers that registers to the console layer must
3653 * call this function upon exit, or if the console driver is in a state
3654 * where it won't be able to handle console services, such as the
3655 * framebuffer console without loaded framebuffer drivers.
3656 *
3657 * The driver must unbind first prior to unregistration.
3658 */
e93a9a86
TI		 3659int do_unregister_con_driver(const struct consw *csw)
3660{
d9c660e7 3661 int i;
3e795de7
AD		 3662
3663 /* cannot unregister a bound driver */
3664 if (con_is_bound(csw))
d9c660e7
DV		 3665 return -EBUSY;
3666
3667 if (csw == conswitchp)
3668 return -EINVAL;
3e795de7
AD		 3669
3670 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3671 struct con_driver *con_driver = &registered_con_driver[i];
3672
2cf30f75 3673 if (con_driver->con == csw) {
d364b5c3
ID		 3674 /*
3675 * Defer the removal of the sysfs entries since that
3676 * will acquire the kernfs s_active lock and we can't
3677 * acquire this lock while holding the console lock:
3678 * the unbind sysfs entry imposes already the opposite
3679 * order. Reset con already here to prevent any later
3680 * lookup to succeed and mark this slot as zombie, so
3681 * it won't get reused until we complete the removal
3682 * in the deferred work.
3683 */
3e795de7 3684 con_driver->con = NULL;
d364b5c3
ID		 3685 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3686 schedule_work(&con_driver_unregister_work);
3687
d9c660e7 3688 return 0;
3e795de7
AD		 3689 }
3690 }
d9c660e7
DV		 3691
3692 return -ENODEV;
3e795de7 3693}
e93a9a86 3694EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 3695
d364b5c3
ID		 3696static void con_driver_unregister_callback(struct work_struct *ignored)
3697{
3698 int i;
3699
3700 console_lock();
3701
3702 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3703 struct con_driver *con_driver = &registered_con_driver[i];
3704
3705 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3706 continue;
3707
3708 console_unlock();
3709
3710 vtconsole_deinit_device(con_driver);
3711 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3712
3713 console_lock();
3714
3715 if (WARN_ON_ONCE(con_driver->con))
3716 con_driver->con = NULL;
3717 con_driver->desc = NULL;
3718 con_driver->dev = NULL;
3719 con_driver->node = 0;
3720 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3721 con_driver->flag = 0;
3722 con_driver->first = 0;
3723 con_driver->last = 0;
3724 }
3725
3726 console_unlock();
3727}
3728
3e795de7
AD		 3729/*
3730 * If we support more console drivers, this function is used
3731 * when a driver wants to take over some existing consoles
3732 * and become default driver for newly opened ones.
3733 *
155957f5 3734 * do_take_over_console is basically a register followed by unbind
50e244cc
AC		 3735 */
3736int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3737{
3738 int err;
3739
3740 err = do_register_con_driver(csw, first, last);
3741 /*
3742 * If we get an busy error we still want to bind the console driver
3743 * and return success, as we may have unbound the console driver
3744 * but not unregistered it.
3745 */
3746 if (err == -EBUSY)
3747 err = 0;
3748 if (!err)
3749 do_bind_con_driver(csw, first, last, deflt);
3750
3751 return err;
3752}
3753EXPORT_SYMBOL_GPL(do_take_over_console);
3754
3e795de7
AD		 3755
3756/*
3757 * give_up_console is a wrapper to unregister_con_driver. It will only
3758 * work if driver is fully unbound.
3759 */
3760void give_up_console(const struct consw *csw)
3761{
70125e76
WY		 3762 console_lock();
3763 do_unregister_con_driver(csw);
3764 console_unlock();
3e795de7
AD		 3765}
3766
6db4063c 3767static int __init vtconsole_class_init(void)
3e795de7 3768{
6db4063c 3769 int i;
3e795de7 3770
6db4063c
AD		 3771 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3772 if (IS_ERR(vtconsole_class)) {
3773 printk(KERN_WARNING "Unable to create vt console class; "
3774 "errno = %ld\n", PTR_ERR(vtconsole_class));
3775 vtconsole_class = NULL;
3776 }
3e795de7 3777
6db4063c 3778 /* Add system drivers to sysfs */
3e795de7
AD		 3779 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3780 struct con_driver *con = &registered_con_driver[i];
3781
805952a8 3782 if (con->con && !con->dev) {
1083a7be
TI		 3783 con->dev =
3784 device_create_with_groups(vtconsole_class, NULL,
3785 MKDEV(0, con->node),
3786 con, con_dev_groups,
3787 "vtcon%i", con->node);
6db4063c 3788
805952a8 3789 if (IS_ERR(con->dev)) {
6db4063c 3790 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3791 "device for %s; errno = %ld\n",
3792 con->desc, PTR_ERR(con->dev));
3793 con->dev = NULL;
6db4063c 3794 } else {
805952a8 3795 vtconsole_init_device(con);
6db4063c 3796 }
3e795de7 3797 }
3e795de7
AD		 3798 }
3799
3e795de7
AD		 3800 return 0;
3801}
6db4063c 3802postcore_initcall(vtconsole_class_init);
3e795de7 3803
1da177e4
LT		 3804#endif
3805
3806/*
3807 * Screen blanking
3808 */
3809
403aac96 3810static int set_vesa_blanking(char __user *p)
1da177e4 3811{
403aac96
YY		 3812 unsigned int mode;
3813
3814 if (get_user(mode, p + 1))
3815 return -EFAULT;
3816
3817 vesa_blank_mode = (mode < 4) ? mode : 0;
3818 return 0;
1da177e4
LT		 3819}
3820
1da177e4
LT		 3821void do_blank_screen(int entering_gfx)
3822{
3823 struct vc_data *vc = vc_cons[fg_console].d;
3824 int i;
3825
3826 WARN_CONSOLE_UNLOCKED();
3827
3828 if (console_blanked) {
3829 if (blank_state == blank_vesa_wait) {
3830 blank_state = blank_off;
d060a321 3831 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3832 }
3833 return;
3834 }
1da177e4
LT		 3835
3836 /* entering graphics mode? */
3837 if (entering_gfx) {
3838 hide_cursor(vc);
3839 save_screen(vc);
3840 vc->vc_sw->con_blank(vc, -1, 1);
3841 console_blanked = fg_console + 1;
b6e8f00f 3842 blank_state = blank_off;
1da177e4
LT		 3843 set_origin(vc);
3844 return;
3845 }
3846
b6e8f00f 3847 if (blank_state != blank_normal_wait)
3848 return;
3849 blank_state = blank_off;
3850
1da177e4
LT		 3851 /* don't blank graphics */
3852 if (vc->vc_mode != KD_TEXT) {
3853 console_blanked = fg_console + 1;
3854 return;
3855 }
3856
3857 hide_cursor(vc);
3858 del_timer_sync(&console_timer);
3859 blank_timer_expired = 0;
3860
3861 save_screen(vc);
3862 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3863 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3864 console_blanked = fg_console + 1;
3865 if (i)
3866 set_origin(vc);
3867
3868 if (console_blank_hook && console_blank_hook(1))
3869 return;
3870
d060a321 3871 if (vesa_off_interval && vesa_blank_mode) {
030babac 3872 blank_state = blank_vesa_wait;
1da177e4
LT		 3873 mod_timer(&console_timer, jiffies + vesa_off_interval);
3874 }
8b92e87d 3875 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3876}
3877EXPORT_SYMBOL(do_blank_screen);
3878
3879/*
3880 * Called by timer as well as from vt_console_driver
3881 */
3882void do_unblank_screen(int leaving_gfx)
3883{
3884 struct vc_data *vc;
3885
3886 /* This should now always be called from a "sane" (read: can schedule)
3887 * context for the sake of the low level drivers, except in the special
3888 * case of oops_in_progress
3889 */
3890 if (!oops_in_progress)
3891 might_sleep();
3892
3893 WARN_CONSOLE_UNLOCKED();
3894
3895 ignore_poke = 0;
3896 if (!console_blanked)
3897 return;
3898 if (!vc_cons_allocated(fg_console)) {
3899 /* impossible */
e620e548
JP		 3900 pr_warn("unblank_screen: tty %d not allocated ??\n",
3901 fg_console + 1);
1da177e4
LT		 3902 return;
3903 }
3904 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3905 /* Try to unblank in oops case too */
3906 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3907 return; /* but leave console_blanked != 0 */
3908
3909 if (blankinterval) {
f324edc8 3910 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3911 blank_state = blank_normal_wait;
3912 }
3913
3914 console_blanked = 0;
8fd4bd22 3915 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3916 /* Low-level driver cannot restore -> do it ourselves */
3917 update_screen(vc);
3918 if (console_blank_hook)
3919 console_blank_hook(0);
3920 set_palette(vc);
3921 set_cursor(vc);
8b92e87d 3922 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3923}
3924EXPORT_SYMBOL(do_unblank_screen);
3925
3926/*
3927 * This is called by the outside world to cause a forced unblank, mostly for
3928 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3929 * call it with 1 as an argument and so force a mode restore... that may kill
3930 * X or at least garbage the screen but would also make the Oops visible...
3931 */
3932void unblank_screen(void)
3933{
3934 do_unblank_screen(0);
3935}
3936
3937/*
70522e12 3938 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3939 * (console operations can still happen at irq time, but only from printk which
70522e12 3940 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3941 */
3942static void blank_screen_t(unsigned long dummy)
3943{
cc63b1e1 3944 if (unlikely(!keventd_up())) {
f324edc8 3945 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3946 return;
3947 }
1da177e4
LT		 3948 blank_timer_expired = 1;
3949 schedule_work(&console_work);
3950}
3951
3952void poke_blanked_console(void)
3953{
3954 WARN_CONSOLE_UNLOCKED();
3955
3956 /* Add this so we quickly catch whoever might call us in a non
3957 * safe context. Nowadays, unblank_screen() isn't to be called in
3958 * atomic contexts and is allowed to schedule (with the special case
3959 * of oops_in_progress, but that isn't of any concern for this
3960 * function. --BenH.
3961 */
3962 might_sleep();
3963
3964 /* This isn't perfectly race free, but a race here would be mostly harmless,
3965 * at worse, we'll do a spurrious blank and it's unlikely
3966 */
3967 del_timer(&console_timer);
3968 blank_timer_expired = 0;
3969
3970 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3971 return;
3972 if (console_blanked)
3973 unblank_screen();
3974 else if (blankinterval) {
f324edc8 3975 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3976 blank_state = blank_normal_wait;
3977 }
3978}
3979
3980/*
3981 * Palettes
3982 */
3983
3984static void set_palette(struct vc_data *vc)
3985{
3986 WARN_CONSOLE_UNLOCKED();
3987
3988 if (vc->vc_mode != KD_GRAPHICS)
3989 vc->vc_sw->con_set_palette(vc, color_table);
3990}
3991
1da177e4
LT		 3992/*
3993 * Load palette into the DAC registers. arg points to a colour
3994 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3995 */
3996
3997int con_set_cmap(unsigned char __user *arg)
3998{
871bdea6
MG		 3999 int i, j, k;
4000 unsigned char colormap[3*16];
4001
4002 if (copy_from_user(colormap, arg, sizeof(colormap)))
4003 return -EFAULT;
1da177e4 4004
ac751efa 4005 console_lock();
871bdea6
MG		 4006 for (i = k = 0; i < 16; i++) {
4007 default_red[i] = colormap[k++];
4008 default_grn[i] = colormap[k++];
4009 default_blu[i] = colormap[k++];
4010 }
4011 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4012 if (!vc_cons_allocated(i))
4013 continue;
4014 for (j = k = 0; j < 16; j++) {
4015 vc_cons[i].d->vc_palette[k++] = default_red[j];
4016 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4017 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4018 }
4019 set_palette(vc_cons[i].d);
4020 }
ac751efa 4021 console_unlock();
1da177e4 4022
871bdea6 4023 return 0;
1da177e4
LT		 4024}
4025
4026int con_get_cmap(unsigned char __user *arg)
4027{
871bdea6
MG		 4028 int i, k;
4029 unsigned char colormap[3*16];
1da177e4 4030
ac751efa 4031 console_lock();
871bdea6
MG		 4032 for (i = k = 0; i < 16; i++) {
4033 colormap[k++] = default_red[i];
4034 colormap[k++] = default_grn[i];
4035 colormap[k++] = default_blu[i];
4036 }
ac751efa 4037 console_unlock();
1da177e4 4038
871bdea6
MG		 4039 if (copy_to_user(arg, colormap, sizeof(colormap)))
4040 return -EFAULT;
4041
4042 return 0;
1da177e4
LT		 4043}
4044
4045void reset_palette(struct vc_data *vc)
4046{
4047 int j, k;
4048 for (j=k=0; j<16; j++) {
4049 vc->vc_palette[k++] = default_red[j];
4050 vc->vc_palette[k++] = default_grn[j];
4051 vc->vc_palette[k++] = default_blu[j];
4052 }
4053 set_palette(vc);
4054}
4055
4056/*
4057 * Font switching
4058 *
4059 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4060 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4061 * depending on width) reserved for each character which is kinda wasty, but
4062 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4063 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4064 * format (maybe we should add a `fontoffset' field to the `display'
4065 * structure so we won't have to convert the fontdata all the time.
4066 * /Jes
4067 */
4068
4069#define max_font_size 65536
4070
4071static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4072{
4073 struct console_font font;
4074 int rc = -EINVAL;
4075 int c;
4076
1da177e4
LT		 4077 if (op->data) {
4078 font.data = kmalloc(max_font_size, GFP_KERNEL);
4079 if (!font.data)
4080 return -ENOMEM;
4081 } else
4082 font.data = NULL;
4083
ac751efa 4084 console_lock();
edab558f
AC		 4085 if (vc->vc_mode != KD_TEXT)
4086 rc = -EINVAL;
4087 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4088 rc = vc->vc_sw->con_font_get(vc, &font);
4089 else
4090 rc = -ENOSYS;
ac751efa 4091 console_unlock();
1da177e4
LT		 4092
4093 if (rc)
4094 goto out;
4095
4096 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4097
1da177e4
LT		 4098 if (op->data && font.charcount > op->charcount)
4099 rc = -ENOSPC;
4100 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4101 if (font.width > op->width || font.height > op->height)
4102 rc = -ENOSPC;
4103 } else {
4104 if (font.width != 8)
4105 rc = -EIO;
4106 else if ((op->height && font.height > op->height) ||
4107 font.height > 32)
4108 rc = -ENOSPC;
4109 }
4110 if (rc)
4111 goto out;
4112
4113 op->height = font.height;
4114 op->width = font.width;
4115 op->charcount = font.charcount;
4116
4117 if (op->data && copy_to_user(op->data, font.data, c))
4118 rc = -EFAULT;
4119
4120out:
4121 kfree(font.data);
4122 return rc;
4123}
4124
4125static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4126{
4127 struct console_font font;
4128 int rc = -EINVAL;
4129 int size;
4130
4131 if (vc->vc_mode != KD_TEXT)
4132 return -EINVAL;
4133 if (!op->data)
4134 return -EINVAL;
4135 if (op->charcount > 512)
4136 return -EINVAL;
4137 if (!op->height) { /* Need to guess font height [compat] */
4138 int h, i;
4139 u8 __user *charmap = op->data;
4140 u8 tmp;
4141
4142 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4143 so that we can get rid of this soon */
4144 if (!(op->flags & KD_FONT_FLAG_OLD))
4145 return -EINVAL;
4146 for (h = 32; h > 0; h--)
4147 for (i = 0; i < op->charcount; i++) {
4148 if (get_user(tmp, &charmap[32*i+h-1]))
4149 return -EFAULT;
4150 if (tmp)
4151 goto nonzero;
4152 }
4153 return -EINVAL;
4154 nonzero:
4155 op->height = h;
4156 }
4157 if (op->width <= 0 || op->width > 32 || op->height > 32)
4158 return -EINVAL;
4159 size = (op->width+7)/8 * 32 * op->charcount;
4160 if (size > max_font_size)
4161 return -ENOSPC;
4162 font.charcount = op->charcount;
4163 font.height = op->height;
4164 font.width = op->width;
9b71ca20
JL		 4165 font.data = memdup_user(op->data, size);
4166 if (IS_ERR(font.data))
4167 return PTR_ERR(font.data);
ac751efa 4168 console_lock();
edab558f
AC		 4169 if (vc->vc_mode != KD_TEXT)
4170 rc = -EINVAL;
4171 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4172 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4173 else
4174 rc = -ENOSYS;
ac751efa 4175 console_unlock();
1da177e4
LT		 4176 kfree(font.data);
4177 return rc;
4178}
4179
4180static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4181{
4182 struct console_font font = {.width = op->width, .height = op->height};
4183 char name[MAX_FONT_NAME];
4184 char *s = name;
4185 int rc;
4186
1da177e4
LT		 4187
4188 if (!op->data)
4189 s = NULL;
4190 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4191 return -EFAULT;
4192 else
4193 name[MAX_FONT_NAME - 1] = 0;
4194
ac751efa 4195 console_lock();
edab558f
AC		 4196 if (vc->vc_mode != KD_TEXT) {
4197 console_unlock();
4198 return -EINVAL;
4199 }
1da177e4
LT		 4200 if (vc->vc_sw->con_font_default)
4201 rc = vc->vc_sw->con_font_default(vc, &font, s);
4202 else
4203 rc = -ENOSYS;
ac751efa 4204 console_unlock();
1da177e4
LT		 4205 if (!rc) {
4206 op->width = font.width;
4207 op->height = font.height;
4208 }
4209 return rc;
4210}
4211
4212static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4213{
4214 int con = op->height;
4215 int rc;
4216
1da177e4 4217
ac751efa 4218 console_lock();
edab558f
AC		 4219 if (vc->vc_mode != KD_TEXT)
4220 rc = -EINVAL;
4221 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4222 rc = -ENOSYS;
4223 else if (con < 0 || !vc_cons_allocated(con))
4224 rc = -ENOTTY;
4225 else if (con == vc->vc_num) /* nothing to do */
4226 rc = 0;
4227 else
4228 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4229 console_unlock();
1da177e4
LT		 4230 return rc;
4231}
4232
4233int con_font_op(struct vc_data *vc, struct console_font_op *op)
4234{
4235 switch (op->op) {
4236 case KD_FONT_OP_SET:
4237 return con_font_set(vc, op);
4238 case KD_FONT_OP_GET:
4239 return con_font_get(vc, op);
4240 case KD_FONT_OP_SET_DEFAULT:
4241 return con_font_default(vc, op);
4242 case KD_FONT_OP_COPY:
4243 return con_font_copy(vc, op);
4244 }
4245 return -ENOSYS;
4246}
4247
4248/*
4249 * Interface exported to selection and vcs.
4250 */
4251
4252/* used by selection */
4253u16 screen_glyph(struct vc_data *vc, int offset)
4254{
4255 u16 w = scr_readw(screenpos(vc, offset, 1));
4256 u16 c = w & 0xff;
4257
4258 if (w & vc->vc_hi_font_mask)
4259 c |= 0x100;
4260 return c;
4261}
f7511d5f 4262EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4263
4264/* used by vcs - note the word offset */
4265unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4266{
4267 return screenpos(vc, 2 * w_offset, viewed);
4268}
4269
4270void getconsxy(struct vc_data *vc, unsigned char *p)
4271{
4272 p[0] = vc->vc_x;
4273 p[1] = vc->vc_y;
4274}
4275
4276void putconsxy(struct vc_data *vc, unsigned char *p)
4277{
9477e260 4278 hide_cursor(vc);
1da177e4
LT		 4279 gotoxy(vc, p[0], p[1]);
4280 set_cursor(vc);
4281}
4282
4283u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4284{
4285 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4286 return softcursor_original;
4287 return scr_readw(org);
4288}
4289
4290void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4291{
4292 scr_writew(val, org);
4293 if ((unsigned long)org == vc->vc_pos) {
4294 softcursor_original = -1;
4295 add_softcursor(vc);
4296 }
4297}
4298
432c9ed2
NP		 4299void vcs_scr_updated(struct vc_data *vc)
4300{
4301 notify_update(vc);
4302}
4303
1da177e4
LT		 4304/*
4305 * Visible symbols for modules
4306 */
4307
4308EXPORT_SYMBOL(color_table);
4309EXPORT_SYMBOL(default_red);
4310EXPORT_SYMBOL(default_grn);
4311EXPORT_SYMBOL(default_blu);
4312EXPORT_SYMBOL(update_region);
4313EXPORT_SYMBOL(redraw_screen);
4314EXPORT_SYMBOL(vc_resize);
4315EXPORT_SYMBOL(fg_console);
4316EXPORT_SYMBOL(console_blank_hook);
4317EXPORT_SYMBOL(console_blanked);
4318EXPORT_SYMBOL(vc_cons);
f6c06b68 4319EXPORT_SYMBOL(global_cursor_default);
1da177e4 4320#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4321EXPORT_SYMBOL(give_up_console);
4322#endif
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