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tty: vt, fix bogus division in csi_J
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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
6ca8dfd7
JS		 280static inline bool con_is_fg(const struct vc_data *vc)
281{
282 return vc->vc_num == fg_console;
283}
284
285static inline bool con_should_update(const struct vc_data *vc)
286{
287 return con_is_visible(vc) && !console_blanked;
288}
1da177e4
LT		 289
290static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
291{
292 unsigned short *p;
293
294 if (!viewed)
295 p = (unsigned short *)(vc->vc_origin + offset);
296 else if (!vc->vc_sw->con_screen_pos)
297 p = (unsigned short *)(vc->vc_visible_origin + offset);
298 else
299 p = vc->vc_sw->con_screen_pos(vc, offset);
300 return p;
301}
302
e33ac1c1 303/* Called from the keyboard irq path.. */
1da177e4
LT		 304static inline void scrolldelta(int lines)
305{
e33ac1c1
AC		 306 /* FIXME */
307 /* scrolldelta needs some kind of consistency lock, but the BKL was
308 and still is not protecting versus the scheduled back end */
1da177e4
LT		 309 scrollback_delta += lines;
310 schedule_console_callback();
311}
312
313void schedule_console_callback(void)
314{
315 schedule_work(&console_work);
316}
317
318static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
319{
320 unsigned short *d, *s;
321
322 if (t+nr >= b)
323 nr = b - t - 1;
324 if (b > vc->vc_rows || t >= b || nr < 1)
325 return;
6ca8dfd7 326 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
1da177e4
LT		 327 return;
328 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
329 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
330 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
386f40c8 331 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
1da177e4
LT		 332 vc->vc_size_row * nr);
333}
334
335static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
336{
337 unsigned short *s;
338 unsigned int step;
339
340 if (t+nr >= b)
341 nr = b - t - 1;
342 if (b > vc->vc_rows || t >= b || nr < 1)
343 return;
6ca8dfd7 344 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
1da177e4
LT		 345 return;
346 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
347 step = vc->vc_cols * nr;
348 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
93f78da4 349 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
1da177e4
LT		 350}
351
352static void do_update_region(struct vc_data *vc, unsigned long start, int count)
353{
1da177e4
LT		 354 unsigned int xx, yy, offset;
355 u16 *p;
356
357 p = (u16 *) start;
358 if (!vc->vc_sw->con_getxy) {
359 offset = (start - vc->vc_origin) / 2;
360 xx = offset % vc->vc_cols;
361 yy = offset / vc->vc_cols;
362 } else {
363 int nxx, nyy;
364 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
365 xx = nxx; yy = nyy;
366 }
367 for(;;) {
368 u16 attrib = scr_readw(p) & 0xff00;
369 int startx = xx;
370 u16 *q = p;
371 while (xx < vc->vc_cols && count) {
372 if (attrib != (scr_readw(p) & 0xff00)) {
373 if (p > q)
374 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
375 startx = xx;
376 q = p;
377 attrib = scr_readw(p) & 0xff00;
378 }
379 p++;
380 xx++;
381 count--;
382 }
383 if (p > q)
384 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
385 if (!count)
386 break;
387 xx = 0;
388 yy++;
389 if (vc->vc_sw->con_getxy) {
390 p = (u16 *)start;
391 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
392 }
393 }
1da177e4
LT		 394}
395
396void update_region(struct vc_data *vc, unsigned long start, int count)
397{
398 WARN_CONSOLE_UNLOCKED();
399
6ca8dfd7 400 if (con_should_update(vc)) {
1da177e4
LT		 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 415
1da177e4
LT		 416/*
417 * ++roman: I completely changed the attribute format for monochrome
418 * mode (!can_do_color). The formerly used MDA (monochrome display
419 * adapter) format didn't allow the combination of certain effects.
420 * Now the attribute is just a bit vector:
421 * Bit 0..1: intensity (0..2)
422 * Bit 2 : underline
423 * Bit 3 : reverse
424 * Bit 7 : blink
425 */
426 {
c9e587ab 427 u8 a = _color;
1da177e4
LT		 428 if (!vc->vc_can_do_color)
429 return _intensity |
fa6ce9ab 430 (_italic ? 2 : 0) |
1da177e4
LT		 431 (_underline ? 4 : 0) |
432 (_reverse ? 8 : 0) |
433 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 434 if (_italic)
435 a = (a & 0xF0) | vc->vc_itcolor;
436 else if (_underline)
1da177e4
LT		 437 a = (a & 0xf0) | vc->vc_ulcolor;
438 else if (_intensity == 0)
439 a = (a & 0xf0) | vc->vc_ulcolor;
440 if (_reverse)
441 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
442 if (_blink)
443 a ^= 0x80;
444 if (_intensity == 2)
445 a ^= 0x08;
446 if (vc->vc_hi_font_mask == 0x100)
447 a <<= 1;
448 return a;
449 }
1da177e4
LT		 450}
451
452static void update_attr(struct vc_data *vc)
453{
fa6ce9ab
JE		 454 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
455 vc->vc_blink, vc->vc_underline,
456 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
457 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 458}
459
460/* Note: inverting the screen twice should revert to the original state */
461void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
462{
463 unsigned short *p;
464
465 WARN_CONSOLE_UNLOCKED();
466
467 count /= 2;
468 p = screenpos(vc, offset, viewed);
6af39ed3 469 if (vc->vc_sw->con_invert_region) {
1da177e4 470 vc->vc_sw->con_invert_region(vc, p, count);
6af39ed3 471 } else {
1da177e4
LT		 472 u16 *q = p;
473 int cnt = count;
474 u16 a;
475
476 if (!vc->vc_can_do_color) {
477 while (cnt--) {
478 a = scr_readw(q);
479 a ^= 0x0800;
480 scr_writew(a, q);
481 q++;
482 }
483 } else if (vc->vc_hi_font_mask == 0x100) {
484 while (cnt--) {
485 a = scr_readw(q);
486 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
487 scr_writew(a, q);
488 q++;
489 }
490 } else {
491 while (cnt--) {
492 a = scr_readw(q);
493 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
494 scr_writew(a, q);
495 q++;
496 }
497 }
498 }
6af39ed3 499
6ca8dfd7 500 if (con_should_update(vc))
1da177e4 501 do_update_region(vc, (unsigned long) p, count);
19e3ae6b 502 notify_update(vc);
1da177e4
LT		 503}
504
505/* used by selection: complement pointer position */
506void complement_pos(struct vc_data *vc, int offset)
507{
414edcd3 508 static int old_offset = -1;
1da177e4
LT		 509 static unsigned short old;
510 static unsigned short oldx, oldy;
511
512 WARN_CONSOLE_UNLOCKED();
513
414edcd3
AD		 514 if (old_offset != -1 && old_offset >= 0 &&
515 old_offset < vc->vc_screenbuf_size) {
516 scr_writew(old, screenpos(vc, old_offset, 1));
6ca8dfd7 517 if (con_should_update(vc))
1da177e4 518 vc->vc_sw->con_putc(vc, old, oldy, oldx);
19e3ae6b 519 notify_update(vc);
1da177e4 520 }
414edcd3
AD		 521
522 old_offset = offset;
523
524 if (offset != -1 && offset >= 0 &&
525 offset < vc->vc_screenbuf_size) {
1da177e4 526 unsigned short new;
414edcd3 527 unsigned short *p;
1da177e4
LT		 528 p = screenpos(vc, offset, 1);
529 old = scr_readw(p);
530 new = old ^ vc->vc_complement_mask;
531 scr_writew(new, p);
6ca8dfd7 532 if (con_should_update(vc)) {
1da177e4
LT		 533 oldx = (offset >> 1) % vc->vc_cols;
534 oldy = (offset >> 1) / vc->vc_cols;
535 vc->vc_sw->con_putc(vc, new, oldy, oldx);
536 }
19e3ae6b 537 notify_update(vc);
1da177e4
LT		 538 }
539}
540
541static void insert_char(struct vc_data *vc, unsigned int nr)
542{
81732c3b 543 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 544
a883b70d 545 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b 546 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
1da177e4 547 vc->vc_need_wrap = 0;
6ca8dfd7 548 if (con_should_update(vc))
81732c3b 549 do_update_region(vc, (unsigned long) p,
b1a925f4 550 vc->vc_cols - vc->vc_x);
1da177e4
LT		 551}
552
553static void delete_char(struct vc_data *vc, unsigned int nr)
554{
81732c3b 555 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 556
b1a925f4 557 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b
JFM		 558 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
559 nr * 2);
1da177e4 560 vc->vc_need_wrap = 0;
6ca8dfd7 561 if (con_should_update(vc))
81732c3b 562 do_update_region(vc, (unsigned long) p,
b1a925f4 563 vc->vc_cols - vc->vc_x);
1da177e4
LT		 564}
565
e882f715 566static int softcursor_original = -1;
1da177e4
LT		 567
568static void add_softcursor(struct vc_data *vc)
569{
570 int i = scr_readw((u16 *) vc->vc_pos);
571 u32 type = vc->vc_cursor_type;
572
573 if (! (type & 0x10)) return;
574 if (softcursor_original != -1) return;
575 softcursor_original = i;
576 i |= ((type >> 8) & 0xff00 );
577 i ^= ((type) & 0xff00 );
578 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
579 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
580 scr_writew(i, (u16 *) vc->vc_pos);
6ca8dfd7 581 if (con_should_update(vc))
1da177e4
LT		 582 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
583}
584
585static void hide_softcursor(struct vc_data *vc)
586{
587 if (softcursor_original != -1) {
588 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
6ca8dfd7 589 if (con_should_update(vc))
1da177e4
LT		 590 vc->vc_sw->con_putc(vc, softcursor_original,
591 vc->vc_y, vc->vc_x);
592 softcursor_original = -1;
593 }
594}
595
596static void hide_cursor(struct vc_data *vc)
597{
598 if (vc == sel_cons)
599 clear_selection();
600 vc->vc_sw->con_cursor(vc, CM_ERASE);
601 hide_softcursor(vc);
602}
603
604static void set_cursor(struct vc_data *vc)
605{
6ca8dfd7 606 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
1da177e4
LT		 607 return;
608 if (vc->vc_deccm) {
609 if (vc == sel_cons)
610 clear_selection();
611 add_softcursor(vc);
612 if ((vc->vc_cursor_type & 0x0f) != 1)
613 vc->vc_sw->con_cursor(vc, CM_DRAW);
614 } else
615 hide_cursor(vc);
616}
617
618static void set_origin(struct vc_data *vc)
619{
620 WARN_CONSOLE_UNLOCKED();
621
6ca8dfd7 622 if (!con_is_visible(vc) ||
1da177e4
LT		 623 !vc->vc_sw->con_set_origin ||
624 !vc->vc_sw->con_set_origin(vc))
625 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
626 vc->vc_visible_origin = vc->vc_origin;
627 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
628 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
629}
630
c0f160a7 631static void save_screen(struct vc_data *vc)
1da177e4
LT		 632{
633 WARN_CONSOLE_UNLOCKED();
634
635 if (vc->vc_sw->con_save_screen)
636 vc->vc_sw->con_save_screen(vc);
637}
638
639/*
640 * Redrawing of screen
641 */
642
2a248307 643void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 644{
645 unsigned short *p = (unsigned short *)vc->vc_origin;
646 int count = vc->vc_screenbuf_size / 2;
647 int mask = vc->vc_hi_font_mask | 0xff;
648
649 for (; count > 0; count--, p++) {
650 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
651 }
652}
653
654void redraw_screen(struct vc_data *vc, int is_switch)
655{
656 int redraw = 0;
657
658 WARN_CONSOLE_UNLOCKED();
659
660 if (!vc) {
661 /* strange ... */
662 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
663 return;
664 }
665
666 if (is_switch) {
667 struct vc_data *old_vc = vc_cons[fg_console].d;
668 if (old_vc == vc)
669 return;
6ca8dfd7 670 if (!con_is_visible(vc))
1da177e4
LT		 671 redraw = 1;
672 *vc->vc_display_fg = vc;
673 fg_console = vc->vc_num;
674 hide_cursor(old_vc);
6ca8dfd7 675 if (!con_is_visible(old_vc)) {
1da177e4
LT		 676 save_screen(old_vc);
677 set_origin(old_vc);
678 }
fbc92a34
KS		 679 if (tty0dev)
680 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 681 } else {
682 hide_cursor(vc);
683 redraw = 1;
684 }
685
686 if (redraw) {
687 int update;
688 int old_was_color = vc->vc_can_do_color;
689
690 set_origin(vc);
691 update = vc->vc_sw->con_switch(vc);
692 set_palette(vc);
693 /*
694 * If console changed from mono<->color, the best we can do
695 * is to clear the buffer attributes. As it currently stands,
696 * rebuilding new attributes from the old buffer is not doable
697 * without overly complex code.
698 */
699 if (old_was_color != vc->vc_can_do_color) {
700 update_attr(vc);
701 clear_buffer_attributes(vc);
702 }
8fd4bd22
JB		 703
704 /* Forcibly update if we're panicing */
705 if ((update && vc->vc_mode != KD_GRAPHICS) ||
706 vt_force_oops_output(vc))
1da177e4
LT		 707 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
708 }
709 set_cursor(vc);
710 if (is_switch) {
711 set_leds();
712 compute_shiftstate();
8182ec49 713 notify_update(vc);
1da177e4
LT		 714 }
715}
716
717/*
718 * Allocation, freeing and resizing of VTs.
719 */
720
721int vc_cons_allocated(unsigned int i)
722{
723 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
724}
725
726static void visual_init(struct vc_data *vc, int num, int init)
727{
728 /* ++Geert: vc->vc_sw->con_init determines console size */
729 if (vc->vc_sw)
730 module_put(vc->vc_sw->owner);
731 vc->vc_sw = conswitchp;
732#ifndef VT_SINGLE_DRIVER
733 if (con_driver_map[num])
734 vc->vc_sw = con_driver_map[num];
735#endif
736 __module_get(vc->vc_sw->owner);
737 vc->vc_num = num;
738 vc->vc_display_fg = &master_display_fg;
08b33249
DZ		 739 if (vc->vc_uni_pagedir_loc)
740 con_free_unimap(vc);
1da177e4 741 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
e4bdab70 742 vc->vc_uni_pagedir = NULL;
1da177e4
LT		 743 vc->vc_hi_font_mask = 0;
744 vc->vc_complement_mask = 0;
745 vc->vc_can_do_color = 0;
8fd4bd22 746 vc->vc_panic_force_write = false;
1b45996d 747 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 748 vc->vc_sw->con_init(vc, init);
749 if (!vc->vc_complement_mask)
750 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
751 vc->vc_s_complement_mask = vc->vc_complement_mask;
752 vc->vc_size_row = vc->vc_cols << 1;
753 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
754}
755
756int vc_allocate(unsigned int currcons) /* return 0 on success */
757{
34902b7f
JS		 758 struct vt_notifier_param param;
759 struct vc_data *vc;
760
1da177e4
LT		 761 WARN_CONSOLE_UNLOCKED();
762
763 if (currcons >= MAX_NR_CONSOLES)
764 return -ENXIO;
34902b7f
JS		 765
766 if (vc_cons[currcons].d)
767 return 0;
768
769 /* due to the granularity of kmalloc, we waste some memory here */
770 /* the alloc is done in two steps, to optimize the common situation
771 of a 25x80 console (structsize=216, screenbuf_size=4000) */
772 /* although the numbers above are not valid since long ago, the
773 point is still up-to-date and the comment still has its value
774 even if only as a historical artifact. --mj, July 1998 */
775 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
776 if (!vc)
1da177e4 777 return -ENOMEM;
34902b7f
JS		 778
779 vc_cons[currcons].d = vc;
780 tty_port_init(&vc->port);
781 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
782
783 visual_init(vc, currcons, 1);
784
785 if (!*vc->vc_uni_pagedir_loc)
1da177e4 786 con_set_default_unimap(vc);
f6c06b68 787
34902b7f
JS		 788 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
789 if (!vc->vc_screenbuf)
790 goto err_free;
791
792 /* If no drivers have overridden us and the user didn't pass a
793 boot option, default to displaying the cursor */
794 if (global_cursor_default == -1)
795 global_cursor_default = 1;
796
797 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
798 vcs_make_sysfs(currcons);
799 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
f6c06b68 800
1da177e4 801 return 0;
34902b7f
JS		 802err_free:
803 kfree(vc);
804 vc_cons[currcons].d = NULL;
805 return -ENOMEM;
1da177e4
LT		 806}
807
e400b6ec
AD		 808static inline int resize_screen(struct vc_data *vc, int width, int height,
809 int user)
1da177e4
LT		 810{
811 /* Resizes the resolution of the display adapater */
812 int err = 0;
813
814 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 815 err = vc->vc_sw->con_resize(vc, width, height, user);
816
1da177e4
LT		 817 return err;
818}
819
820/*
821 * Change # of rows and columns (0 means unchanged/the size of fg_console)
822 * [this is to be used together with some user program
823 * like resize that changes the hardware videomode]
824 */
825#define VC_RESIZE_MAXCOL (32767)
826#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 827
828/**
829 * vc_do_resize - resizing method for the tty
830 * @tty: tty being resized
831 * @real_tty: real tty (different to tty if a pty/tty pair)
832 * @vc: virtual console private data
833 * @cols: columns
834 * @lines: lines
835 *
836 * Resize a virtual console, clipping according to the actual constraints.
837 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 838 * information and perform any necessary signal handling.
8c9a9dd0 839 *
6a1c0680 840 * Caller must hold the console semaphore. Takes the termios rwsem and
8c9a9dd0
AC		 841 * ctrl_lock of the tty IFF a tty is passed.
842 */
843
fc6f6238
AC		 844static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
845 unsigned int cols, unsigned int lines)
1da177e4
LT		 846{
847 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 848 unsigned long end;
f2ee4ae8 849 unsigned int old_rows, old_row_size;
1da177e4 850 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 851 unsigned int user;
1da177e4
LT		 852 unsigned short *newscreen;
853
854 WARN_CONSOLE_UNLOCKED();
855
856 if (!vc)
857 return -ENXIO;
858
e400b6ec
AD		 859 user = vc->vc_resize_user;
860 vc->vc_resize_user = 0;
861
1da177e4
LT		 862 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
863 return -EINVAL;
864
865 new_cols = (cols ? cols : vc->vc_cols);
866 new_rows = (lines ? lines : vc->vc_rows);
867 new_row_size = new_cols << 1;
868 new_screen_size = new_row_size * new_rows;
869
870 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
871 return 0;
872
5cbded58 873 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 874 if (!newscreen)
875 return -ENOMEM;
876
877 old_rows = vc->vc_rows;
1da177e4 878 old_row_size = vc->vc_size_row;
1da177e4 879
e400b6ec 880 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 881 if (err) {
882 kfree(newscreen);
883 return err;
884 }
885
886 vc->vc_rows = new_rows;
887 vc->vc_cols = new_cols;
888 vc->vc_size_row = new_row_size;
889 vc->vc_screenbuf_size = new_screen_size;
890
891 rlth = min(old_row_size, new_row_size);
892 rrem = new_row_size - rlth;
893 old_origin = vc->vc_origin;
894 new_origin = (long) newscreen;
895 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 896
897 if (vc->vc_y > new_rows) {
898 if (old_rows - vc->vc_y < new_rows) {
899 /*
900 * Cursor near the bottom, copy contents from the
901 * bottom of buffer
902 */
903 old_origin += (old_rows - new_rows) * old_row_size;
3b41dc1a
AD		 904 } else {
905 /*
906 * Cursor is in no man's land, copy 1/2 screenful
907 * from the top and bottom of cursor position
908 */
909 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
3b41dc1a 910 }
9fc2b2d0
FJ		 911 }
912
913 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4
LT		 914
915 update_attr(vc);
916
3b41dc1a
AD		 917 while (old_origin < end) {
918 scr_memcpyw((unsigned short *) new_origin,
919 (unsigned short *) old_origin, rlth);
1da177e4 920 if (rrem)
3b41dc1a
AD		 921 scr_memsetw((void *)(new_origin + rlth),
922 vc->vc_video_erase_char, rrem);
1da177e4
LT		 923 old_origin += old_row_size;
924 new_origin += new_row_size;
925 }
926 if (new_scr_end > new_origin)
3b41dc1a
AD		 927 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
928 new_scr_end - new_origin);
5c9228f0 929 kfree(vc->vc_screenbuf);
1da177e4 930 vc->vc_screenbuf = newscreen;
1da177e4
LT		 931 vc->vc_screenbuf_size = new_screen_size;
932 set_origin(vc);
933
934 /* do part of a reset_terminal() */
935 vc->vc_top = 0;
936 vc->vc_bottom = vc->vc_rows;
937 gotoxy(vc, vc->vc_x, vc->vc_y);
938 save_cur(vc);
939
8c9a9dd0
AC		 940 if (tty) {
941 /* Rewrite the requested winsize data with the actual
942 resulting sizes */
943 struct winsize ws;
1da177e4
LT		 944 memset(&ws, 0, sizeof(ws));
945 ws.ws_row = vc->vc_rows;
946 ws.ws_col = vc->vc_cols;
947 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 948 tty_do_resize(tty, &ws);
1da177e4
LT		 949 }
950
6ca8dfd7 951 if (con_is_visible(vc))
1da177e4 952 update_screen(vc);
8b92e87d 953 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 954 return err;
955}
956
8c9a9dd0
AC		 957/**
958 * vc_resize - resize a VT
959 * @vc: virtual console
960 * @cols: columns
961 * @rows: rows
962 *
963 * Resize a virtual console as seen from the console end of things. We
964 * use the common vc_do_resize methods to update the structures. The
965 * caller must hold the console sem to protect console internals and
8ce73264 966 * vc->port.tty
8c9a9dd0
AC		 967 */
968
969int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
970{
8ce73264 971 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 972}
973
974/**
975 * vt_resize - resize a VT
976 * @tty: tty to resize
8c9a9dd0
AC		 977 * @ws: winsize attributes
978 *
979 * Resize a virtual terminal. This is called by the tty layer as we
980 * register our own handler for resizing. The mutual helper does all
981 * the actual work.
982 *
983 * Takes the console sem and the called methods then take the tty
6a1c0680 984 * termios_rwsem and the tty ctrl_lock in that order.
8c9a9dd0 985 */
da2bdf9a 986static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 987{
8c9a9dd0
AC		 988 struct vc_data *vc = tty->driver_data;
989 int ret;
ca9bda00 990
ac751efa 991 console_lock();
fc6f6238 992 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 993 console_unlock();
8c9a9dd0 994 return ret;
ca9bda00 995}
1da177e4 996
421b40a6 997struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 998{
421b40a6
PH		 999 struct vc_data *vc = NULL;
1000
1da177e4
LT		 1001 WARN_CONSOLE_UNLOCKED();
1002
1003 if (vc_cons_allocated(currcons)) {
421b40a6 1004 struct vt_notifier_param param;
4995f8ef 1005
421b40a6 1006 param.vc = vc = vc_cons[currcons].d;
b293d758 1007 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1008 vcs_remove_sysfs(currcons);
1da177e4 1009 vc->vc_sw->con_deinit(vc);
bde0d2c9 1010 put_pid(vc->vt_pid);
d459ec0b 1011 module_put(vc->vc_sw->owner);
5c9228f0 1012 kfree(vc->vc_screenbuf);
1da177e4
LT		 1013 vc_cons[currcons].d = NULL;
1014 }
421b40a6 1015 return vc;
1da177e4
LT		 1016}
1017
1018/*
1019 * VT102 emulator
1020 */
1021
079c9534
AC		 1022#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1023#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1024#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1025
1026#define decarm VC_REPEAT
1027#define decckm VC_CKMODE
1028#define kbdapplic VC_APPLIC
1029#define lnm VC_CRLF
1030
1031/*
1032 * this is what the terminal answers to a ESC-Z or csi0c query.
1033 */
1034#define VT100ID "\033[?1;2c"
1035#define VT102ID "\033[?6c"
1036
8ede5cce 1037const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1da177e4
LT		 1038 8,12,10,14, 9,13,11,15 };
1039
1040/* the default colour table, for VGA+ colour systems */
91e74ca5
JS		 1041unsigned char default_red[] = {
1042 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1043 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1044};
1045module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1046
1047unsigned char default_grn[] = {
1048 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1049 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1050};
1051module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1052
1053unsigned char default_blu[] = {
1054 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1055 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1056};
1057module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1c2bbe6a 1058
1da177e4
LT		 1059/*
1060 * gotoxy() must verify all boundaries, because the arguments
1061 * might also be negative. If the given position is out of
1062 * bounds, the cursor is placed at the nearest margin.
1063 */
1064static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1065{
1066 int min_y, max_y;
1067
1068 if (new_x < 0)
1069 vc->vc_x = 0;
1070 else {
1071 if (new_x >= vc->vc_cols)
1072 vc->vc_x = vc->vc_cols - 1;
1073 else
1074 vc->vc_x = new_x;
1075 }
1076
1077 if (vc->vc_decom) {
1078 min_y = vc->vc_top;
1079 max_y = vc->vc_bottom;
1080 } else {
1081 min_y = 0;
1082 max_y = vc->vc_rows;
1083 }
1084 if (new_y < min_y)
1085 vc->vc_y = min_y;
1086 else if (new_y >= max_y)
1087 vc->vc_y = max_y - 1;
1088 else
1089 vc->vc_y = new_y;
1090 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1091 vc->vc_need_wrap = 0;
1092}
1093
1094/* for absolute user moves, when decom is set */
1095static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1096{
1097 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1098}
1099
1b0ec88a 1100void scrollback(struct vc_data *vc)
1da177e4 1101{
1b0ec88a 1102 scrolldelta(-(vc->vc_rows / 2));
1da177e4
LT		 1103}
1104
1105void scrollfront(struct vc_data *vc, int lines)
1106{
1107 if (!lines)
1108 lines = vc->vc_rows / 2;
1109 scrolldelta(lines);
1110}
1111
1112static void lf(struct vc_data *vc)
1113{
1114 /* don't scroll if above bottom of scrolling region, or
1115 * if below scrolling region
1116 */
1117 if (vc->vc_y + 1 == vc->vc_bottom)
1118 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1119 else if (vc->vc_y < vc->vc_rows - 1) {
1120 vc->vc_y++;
1121 vc->vc_pos += vc->vc_size_row;
1122 }
1123 vc->vc_need_wrap = 0;
b293d758 1124 notify_write(vc, '\n');
1da177e4
LT		 1125}
1126
1127static void ri(struct vc_data *vc)
1128{
1129 /* don't scroll if below top of scrolling region, or
1130 * if above scrolling region
1131 */
1132 if (vc->vc_y == vc->vc_top)
1133 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1134 else if (vc->vc_y > 0) {
1135 vc->vc_y--;
1136 vc->vc_pos -= vc->vc_size_row;
1137 }
1138 vc->vc_need_wrap = 0;
1139}
1140
1141static inline void cr(struct vc_data *vc)
1142{
1143 vc->vc_pos -= vc->vc_x << 1;
1144 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1145 notify_write(vc, '\r');
1da177e4
LT		 1146}
1147
1148static inline void bs(struct vc_data *vc)
1149{
1150 if (vc->vc_x) {
1151 vc->vc_pos -= 2;
1152 vc->vc_x--;
1153 vc->vc_need_wrap = 0;
b293d758 1154 notify_write(vc, '\b');
1da177e4
LT		 1155 }
1156}
1157
1158static inline void del(struct vc_data *vc)
1159{
1160 /* ignored */
1161}
1162
1163static void csi_J(struct vc_data *vc, int vpar)
1164{
1165 unsigned int count;
1166 unsigned short * start;
1167
1168 switch (vpar) {
1169 case 0: /* erase from cursor to end of display */
1170 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1171 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1172 break;
1173 case 1: /* erase from start to cursor */
1174 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1175 start = (unsigned short *)vc->vc_origin;
1da177e4 1176 break;
f8df13e0
PP		 1177 case 3: /* erase scroll-back buffer (and whole display) */
1178 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
42acfc66 1179 vc->vc_screenbuf_size);
f8df13e0 1180 set_origin(vc);
6ca8dfd7 1181 if (con_is_visible(vc))
0930b095 1182 update_screen(vc);
f8df13e0 1183 /* fall through */
1da177e4
LT		 1184 case 2: /* erase whole display */
1185 count = vc->vc_cols * vc->vc_rows;
1186 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1187 break;
1188 default:
1189 return;
1190 }
1191 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
6ca8dfd7 1192 if (con_should_update(vc))
81732c3b 1193 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1194 vc->vc_need_wrap = 0;
1195}
1196
1197static void csi_K(struct vc_data *vc, int vpar)
1198{
1199 unsigned int count;
1200 unsigned short * start;
1201
1202 switch (vpar) {
1203 case 0: /* erase from cursor to end of line */
1204 count = vc->vc_cols - vc->vc_x;
1205 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1206 break;
1207 case 1: /* erase from start of line to cursor */
1208 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1209 count = vc->vc_x + 1;
1da177e4
LT		 1210 break;
1211 case 2: /* erase whole line */
1212 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1213 count = vc->vc_cols;
1da177e4
LT		 1214 break;
1215 default:
1216 return;
1217 }
1218 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1219 vc->vc_need_wrap = 0;
6ca8dfd7 1220 if (con_should_update(vc))
81732c3b 1221 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1222}
1223
1224static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1225{ /* not vt100? */
1226 int count;
1227
1228 if (!vpar)
1229 vpar++;
1230 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1231
1232 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
6ca8dfd7 1233 if (con_should_update(vc))
1da177e4
LT		 1234 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1235 vc->vc_need_wrap = 0;
1236}
1237
1238static void default_attr(struct vc_data *vc)
1239{
1240 vc->vc_intensity = 1;
fa6ce9ab 1241 vc->vc_italic = 0;
1da177e4
LT		 1242 vc->vc_underline = 0;
1243 vc->vc_reverse = 0;
1244 vc->vc_blink = 0;
1245 vc->vc_color = vc->vc_def_color;
1246}
1247
cec5b2a9
AB		 1248struct rgb { u8 r; u8 g; u8 b; };
1249
0f91e142 1250static void rgb_from_256(int i, struct rgb *c)
cec5b2a9 1251{
cec5b2a9 1252 if (i < 8) { /* Standard colours. */
0f91e142
JS		 1253 c->r = i&1 ? 0xaa : 0x00;
1254 c->g = i&2 ? 0xaa : 0x00;
1255 c->b = i&4 ? 0xaa : 0x00;
cec5b2a9 1256 } else if (i < 16) {
0f91e142
JS		 1257 c->r = i&1 ? 0xff : 0x55;
1258 c->g = i&2 ? 0xff : 0x55;
1259 c->b = i&4 ? 0xff : 0x55;
cec5b2a9 1260 } else if (i < 232) { /* 6x6x6 colour cube. */
0f91e142
JS		 1261 c->r = (i - 16) / 36 * 85 / 2;
1262 c->g = (i - 16) / 6 % 6 * 85 / 2;
1263 c->b = (i - 16) % 6 * 85 / 2;
cec5b2a9 1264 } else /* Grayscale ramp. */
0f91e142 1265 c->r = c->g = c->b = i * 10 - 2312;
cec5b2a9
AB		 1266}
1267
0f91e142 1268static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
cec5b2a9 1269{
193df022
JS		 1270 u8 hue = 0, max = max3(c->r, c->g, c->b);
1271
1272 if (c->r > max / 2)
1273 hue |= 4;
1274 if (c->g > max / 2)
1275 hue |= 2;
1276 if (c->b > max / 2)
1277 hue |= 1;
1278
1279 if (hue == 7 && max <= 0x55) {
1280 hue = 0;
1281 vc->vc_intensity = 2;
1282 } else if (max > 0xaa)
1283 vc->vc_intensity = 2;
cec5b2a9 1284 else
193df022
JS		 1285 vc->vc_intensity = 1;
1286
cec5b2a9
AB		 1287 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1288}
1289
0f91e142 1290static void rgb_background(struct vc_data *vc, const struct rgb *c)
cec5b2a9
AB		 1291{
1292 /* For backgrounds, err on the dark side. */
1293 vc->vc_color = (vc->vc_color & 0x0f)
0f91e142 1294 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
cec5b2a9
AB		 1295}
1296
e05ab238
JS		 1297/*
1298 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1299 * and thus need to be detected and ignored by hand. Strictly speaking, that
1300 * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1301 * no one produces such codes and almost no one accepts them.
1302 *
1303 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1304 * supporting them.
1305 */
1306static int vc_t416_color(struct vc_data *vc, int i,
0f91e142 1307 void(*set_color)(struct vc_data *vc, const struct rgb *c))
e05ab238 1308{
0f91e142
JS		 1309 struct rgb c;
1310
e05ab238
JS		 1311 i++;
1312 if (i > vc->vc_npar)
1313 return i;
1314
0bf1f4a8 1315 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
3e7ec4a0 1316 /* 256 colours */
e05ab238 1317 i++;
0f91e142 1318 rgb_from_256(vc->vc_par[i], &c);
669e0a51 1319 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
3e7ec4a0 1320 /* 24 bit */
0f91e142
JS		 1321 c.r = vc->vc_par[i + 1];
1322 c.g = vc->vc_par[i + 2];
1323 c.b = vc->vc_par[i + 3];
e05ab238 1324 i += 3;
0f91e142
JS		 1325 } else
1326 return i;
1327
1328 set_color(vc, &c);
e05ab238
JS		 1329
1330 return i;
1331}
1332
ac751efa 1333/* console_lock is held */
1da177e4
LT		 1334static void csi_m(struct vc_data *vc)
1335{
1336 int i;
1337
1338 for (i = 0; i <= vc->vc_npar; i++)
1339 switch (vc->vc_par[i]) {
aada0a34
JS		 1340 case 0: /* all attributes off */
1341 default_attr(vc);
1342 break;
1343 case 1:
1344 vc->vc_intensity = 2;
1345 break;
1346 case 2:
1347 vc->vc_intensity = 0;
1348 break;
1349 case 3:
1350 vc->vc_italic = 1;
1351 break;
1352 case 4:
1353 vc->vc_underline = 1;
1354 break;
1355 case 5:
1356 vc->vc_blink = 1;
1357 break;
1358 case 7:
1359 vc->vc_reverse = 1;
1360 break;
1361 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1362 * Select primary font, don't display control chars if
1363 * defined, don't set bit 8 on output.
1364 */
1365 vc->vc_translate = set_translate(vc->vc_charset == 0
1366 ? vc->vc_G0_charset
1367 : vc->vc_G1_charset, vc);
1368 vc->vc_disp_ctrl = 0;
1369 vc->vc_toggle_meta = 0;
1370 break;
1371 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1372 * Select first alternate font, lets chars < 32 be
1373 * displayed as ROM chars.
1374 */
1375 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1376 vc->vc_disp_ctrl = 1;
1377 vc->vc_toggle_meta = 0;
1378 break;
1379 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1380 * Select second alternate font, toggle high bit
1381 * before displaying as ROM char.
1382 */
1383 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1384 vc->vc_disp_ctrl = 1;
1385 vc->vc_toggle_meta = 1;
1386 break;
1387 case 21:
1388 case 22:
1389 vc->vc_intensity = 1;
1390 break;
1391 case 23:
1392 vc->vc_italic = 0;
1393 break;
1394 case 24:
1395 vc->vc_underline = 0;
1396 break;
1397 case 25:
1398 vc->vc_blink = 0;
1399 break;
1400 case 27:
1401 vc->vc_reverse = 0;
1402 break;
1403 case 38:
1404 i = vc_t416_color(vc, i, rgb_foreground);
1405 break;
1406 case 48:
1407 i = vc_t416_color(vc, i, rgb_background);
1408 break;
1409 case 39:
1410 vc->vc_color = (vc->vc_def_color & 0x0f) |
1411 (vc->vc_color & 0xf0);
1412 break;
1413 case 49:
1414 vc->vc_color = (vc->vc_def_color & 0xf0) |
1415 (vc->vc_color & 0x0f);
1416 break;
1417 default:
fadb4244
AB		 1418 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1419 if (vc->vc_par[i] < 100)
1420 vc->vc_intensity = 2;
cc67dc28
AB		 1421 vc->vc_par[i] -= 60;
1422 }
aada0a34
JS		 1423 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1424 vc->vc_color = color_table[vc->vc_par[i] - 30]
1425 | (vc->vc_color & 0xf0);
1426 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1427 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1428 | (vc->vc_color & 0x0f);
1429 break;
1da177e4
LT		 1430 }
1431 update_attr(vc);
1432}
1433
6732c8bb 1434static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1435{
1436 while (*p) {
6732c8bb 1437 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1438 p++;
1439 }
6732c8bb 1440 tty_schedule_flip(port);
1da177e4
LT		 1441}
1442
1443static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1444{
1445 char buf[40];
1446
1447 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1448 respond_string(buf, tty->port);
1da177e4
LT		 1449}
1450
1451static inline void status_report(struct tty_struct *tty)
1452{
6732c8bb 1453 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1454}
1455
6732c8bb 1456static inline void respond_ID(struct tty_struct *tty)
1da177e4 1457{
6732c8bb 1458 respond_string(VT102ID, tty->port);
1da177e4
LT		 1459}
1460
1461void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1462{
1463 char buf[8];
1464
1465 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1466 (char)('!' + mry));
6732c8bb 1467 respond_string(buf, tty->port);
1da177e4
LT		 1468}
1469
1470/* invoked via ioctl(TIOCLINUX) and through set_selection */
1471int mouse_reporting(void)
1472{
1473 return vc_cons[fg_console].d->vc_report_mouse;
1474}
1475
ac751efa 1476/* console_lock is held */
1da177e4
LT		 1477static void set_mode(struct vc_data *vc, int on_off)
1478{
1479 int i;
1480
1481 for (i = 0; i <= vc->vc_npar; i++)
1482 if (vc->vc_ques) {
1483 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1484 case 1: /* Cursor keys send ^[Ox/^[[x */
1485 if (on_off)
1486 set_kbd(vc, decckm);
1487 else
1488 clr_kbd(vc, decckm);
1489 break;
1490 case 3: /* 80/132 mode switch unimplemented */
1da177e4
LT		 1491#if 0
1492 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1493 /* this alone does not suffice; some user mode
1494 utility has to change the hardware regs */
1495#endif
1496 break;
1497 case 5: /* Inverted screen on/off */
1498 if (vc->vc_decscnm != on_off) {
1499 vc->vc_decscnm = on_off;
1500 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1501 update_attr(vc);
1502 }
1503 break;
1504 case 6: /* Origin relative/absolute */
1505 vc->vc_decom = on_off;
1506 gotoxay(vc, 0, 0);
1507 break;
1508 case 7: /* Autowrap on/off */
1509 vc->vc_decawm = on_off;
1510 break;
1511 case 8: /* Autorepeat on/off */
1512 if (on_off)
1513 set_kbd(vc, decarm);
1514 else
1515 clr_kbd(vc, decarm);
1516 break;
1517 case 9:
1518 vc->vc_report_mouse = on_off ? 1 : 0;
1519 break;
1520 case 25: /* Cursor on/off */
1521 vc->vc_deccm = on_off;
1522 break;
1523 case 1000:
1524 vc->vc_report_mouse = on_off ? 2 : 0;
1525 break;
1526 }
1527 } else {
1528 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1529 case 3: /* Monitor (display ctrls) */
1530 vc->vc_disp_ctrl = on_off;
1531 break;
1532 case 4: /* Insert Mode on/off */
1533 vc->vc_decim = on_off;
1534 break;
1535 case 20: /* Lf, Enter == CrLf/Lf */
1536 if (on_off)
1537 set_kbd(vc, lnm);
1538 else
1539 clr_kbd(vc, lnm);
1540 break;
1541 }
1542 }
1543}
1544
ac751efa 1545/* console_lock is held */
1da177e4
LT		 1546static void setterm_command(struct vc_data *vc)
1547{
1548 switch(vc->vc_par[0]) {
1549 case 1: /* set color for underline mode */
1550 if (vc->vc_can_do_color &&
1551 vc->vc_par[1] < 16) {
1552 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1553 if (vc->vc_underline)
1554 update_attr(vc);
1555 }
1556 break;
1557 case 2: /* set color for half intensity mode */
1558 if (vc->vc_can_do_color &&
1559 vc->vc_par[1] < 16) {
1560 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1561 if (vc->vc_intensity == 0)
1562 update_attr(vc);
1563 }
1564 break;
1565 case 8: /* store colors as defaults */
1566 vc->vc_def_color = vc->vc_attr;
1567 if (vc->vc_hi_font_mask == 0x100)
1568 vc->vc_def_color >>= 1;
1569 default_attr(vc);
1570 update_attr(vc);
1571 break;
1572 case 9: /* set blanking interval */
f324edc8 1573 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1574 poke_blanked_console();
1575 break;
1576 case 10: /* set bell frequency in Hz */
1577 if (vc->vc_npar >= 1)
1578 vc->vc_bell_pitch = vc->vc_par[1];
1579 else
1580 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1581 break;
1582 case 11: /* set bell duration in msec */
1583 if (vc->vc_npar >= 1)
1584 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
3372ec28 1585 msecs_to_jiffies(vc->vc_par[1]) : 0;
1da177e4
LT		 1586 else
1587 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1588 break;
1589 case 12: /* bring specified console to the front */
1590 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1591 set_console(vc->vc_par[1] - 1);
1592 break;
1593 case 13: /* unblank the screen */
1594 poke_blanked_console();
1595 break;
1596 case 14: /* set vesa powerdown interval */
1597 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1598 break;
1599 case 15: /* activate the previous console */
1600 set_console(last_console);
1601 break;
bd63364c
SD		 1602 case 16: /* set cursor blink duration in msec */
1603 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1604 vc->vc_par[1] <= USHRT_MAX)
1605 vc->vc_cur_blink_ms = vc->vc_par[1];
1606 else
1607 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1608 break;
1da177e4
LT		 1609 }
1610}
1611
ac751efa 1612/* console_lock is held */
1da177e4
LT		 1613static void csi_at(struct vc_data *vc, unsigned int nr)
1614{
1615 if (nr > vc->vc_cols - vc->vc_x)
1616 nr = vc->vc_cols - vc->vc_x;
1617 else if (!nr)
1618 nr = 1;
1619 insert_char(vc, nr);
1620}
1621
ac751efa 1622/* console_lock is held */
1da177e4
LT		 1623static void csi_L(struct vc_data *vc, unsigned int nr)
1624{
1625 if (nr > vc->vc_rows - vc->vc_y)
1626 nr = vc->vc_rows - vc->vc_y;
1627 else if (!nr)
1628 nr = 1;
1629 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1630 vc->vc_need_wrap = 0;
1631}
1632
ac751efa 1633/* console_lock is held */
1da177e4
LT		 1634static void csi_P(struct vc_data *vc, unsigned int nr)
1635{
1636 if (nr > vc->vc_cols - vc->vc_x)
1637 nr = vc->vc_cols - vc->vc_x;
1638 else if (!nr)
1639 nr = 1;
1640 delete_char(vc, nr);
1641}
1642
ac751efa 1643/* console_lock is held */
1da177e4
LT		 1644static void csi_M(struct vc_data *vc, unsigned int nr)
1645{
1646 if (nr > vc->vc_rows - vc->vc_y)
1647 nr = vc->vc_rows - vc->vc_y;
1648 else if (!nr)
1649 nr=1;
1650 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1651 vc->vc_need_wrap = 0;
1652}
1653
ac751efa 1654/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1655static void save_cur(struct vc_data *vc)
1656{
1657 vc->vc_saved_x = vc->vc_x;
1658 vc->vc_saved_y = vc->vc_y;
1659 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1660 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1661 vc->vc_s_underline = vc->vc_underline;
1662 vc->vc_s_blink = vc->vc_blink;
1663 vc->vc_s_reverse = vc->vc_reverse;
1664 vc->vc_s_charset = vc->vc_charset;
1665 vc->vc_s_color = vc->vc_color;
1666 vc->vc_saved_G0 = vc->vc_G0_charset;
1667 vc->vc_saved_G1 = vc->vc_G1_charset;
1668}
1669
ac751efa 1670/* console_lock is held */
1da177e4
LT		 1671static void restore_cur(struct vc_data *vc)
1672{
1673 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1674 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1675 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1676 vc->vc_underline = vc->vc_s_underline;
1677 vc->vc_blink = vc->vc_s_blink;
1678 vc->vc_reverse = vc->vc_s_reverse;
1679 vc->vc_charset = vc->vc_s_charset;
1680 vc->vc_color = vc->vc_s_color;
1681 vc->vc_G0_charset = vc->vc_saved_G0;
1682 vc->vc_G1_charset = vc->vc_saved_G1;
1683 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1684 update_attr(vc);
1685 vc->vc_need_wrap = 0;
1686}
1687
b290af68 1688enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1da177e4 1689 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
63f3a16d 1690 ESpalette, ESosc };
1da177e4 1691
ac751efa 1692/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1693static void reset_terminal(struct vc_data *vc, int do_clear)
1694{
1695 vc->vc_top = 0;
1696 vc->vc_bottom = vc->vc_rows;
1697 vc->vc_state = ESnormal;
1698 vc->vc_ques = 0;
1699 vc->vc_translate = set_translate(LAT1_MAP, vc);
1700 vc->vc_G0_charset = LAT1_MAP;
1701 vc->vc_G1_charset = GRAF_MAP;
1702 vc->vc_charset = 0;
1703 vc->vc_need_wrap = 0;
1704 vc->vc_report_mouse = 0;
042f10ec 1705 vc->vc_utf = default_utf8;
1da177e4
LT		 1706 vc->vc_utf_count = 0;
1707
1708 vc->vc_disp_ctrl = 0;
1709 vc->vc_toggle_meta = 0;
1710
1711 vc->vc_decscnm = 0;
1712 vc->vc_decom = 0;
1713 vc->vc_decawm = 1;
f6c06b68 1714 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1715 vc->vc_decim = 0;
1716
079c9534 1717 vt_reset_keyboard(vc->vc_num);
1da177e4 1718
9ea9a886 1719 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1720 vc->vc_complement_mask = vc->vc_s_complement_mask;
1721
1722 default_attr(vc);
1723 update_attr(vc);
1724
1725 vc->vc_tab_stop[0] = 0x01010100;
1726 vc->vc_tab_stop[1] =
1727 vc->vc_tab_stop[2] =
1728 vc->vc_tab_stop[3] =
a564738c
WK		 1729 vc->vc_tab_stop[4] =
1730 vc->vc_tab_stop[5] =
1731 vc->vc_tab_stop[6] =
1732 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1733
1734 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1735 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 1736 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1737
1738 gotoxy(vc, 0, 0);
1739 save_cur(vc);
1740 if (do_clear)
1741 csi_J(vc, 2);
1742}
1743
ac751efa 1744/* console_lock is held */
1da177e4
LT		 1745static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1746{
1747 /*
1748 * Control characters can be used in the _middle_
1749 * of an escape sequence.
1750 */
63f3a16d
AB		 1751 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1752 return;
1da177e4
LT		 1753 switch (c) {
1754 case 0:
1755 return;
1756 case 7:
63f3a16d
AB		 1757 if (vc->vc_state == ESosc)
1758 vc->vc_state = ESnormal;
1759 else if (vc->vc_bell_duration)
1da177e4
LT		 1760 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1761 return;
1762 case 8:
1763 bs(vc);
1764 return;
1765 case 9:
1766 vc->vc_pos -= (vc->vc_x << 1);
1767 while (vc->vc_x < vc->vc_cols - 1) {
1768 vc->vc_x++;
1769 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1770 break;
1771 }
1772 vc->vc_pos += (vc->vc_x << 1);
b293d758 1773 notify_write(vc, '\t');
1da177e4
LT		 1774 return;
1775 case 10: case 11: case 12:
1776 lf(vc);
1777 if (!is_kbd(vc, lnm))
1778 return;
1779 case 13:
1780 cr(vc);
1781 return;
1782 case 14:
1783 vc->vc_charset = 1;
1784 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1785 vc->vc_disp_ctrl = 1;
1786 return;
1787 case 15:
1788 vc->vc_charset = 0;
1789 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1790 vc->vc_disp_ctrl = 0;
1791 return;
1792 case 24: case 26:
1793 vc->vc_state = ESnormal;
1794 return;
1795 case 27:
1796 vc->vc_state = ESesc;
1797 return;
1798 case 127:
1799 del(vc);
1800 return;
1801 case 128+27:
1802 vc->vc_state = ESsquare;
1803 return;
1804 }
1805 switch(vc->vc_state) {
1806 case ESesc:
1807 vc->vc_state = ESnormal;
1808 switch (c) {
1809 case '[':
1810 vc->vc_state = ESsquare;
1811 return;
1812 case ']':
1813 vc->vc_state = ESnonstd;
1814 return;
1815 case '%':
1816 vc->vc_state = ESpercent;
1817 return;
1818 case 'E':
1819 cr(vc);
1820 lf(vc);
1821 return;
1822 case 'M':
1823 ri(vc);
1824 return;
1825 case 'D':
1826 lf(vc);
1827 return;
1828 case 'H':
1829 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1830 return;
1831 case 'Z':
1832 respond_ID(tty);
1833 return;
1834 case '7':
1835 save_cur(vc);
1836 return;
1837 case '8':
1838 restore_cur(vc);
1839 return;
1840 case '(':
1841 vc->vc_state = ESsetG0;
1842 return;
1843 case ')':
1844 vc->vc_state = ESsetG1;
1845 return;
1846 case '#':
1847 vc->vc_state = EShash;
1848 return;
1849 case 'c':
1850 reset_terminal(vc, 1);
1851 return;
1852 case '>': /* Numeric keypad */
1853 clr_kbd(vc, kbdapplic);
1854 return;
1855 case '=': /* Appl. keypad */
1856 set_kbd(vc, kbdapplic);
1857 return;
1858 }
1859 return;
1860 case ESnonstd:
1861 if (c=='P') { /* palette escape sequence */
1862 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1863 vc->vc_par[vc->vc_npar] = 0;
1864 vc->vc_npar = 0;
1865 vc->vc_state = ESpalette;
1866 return;
1867 } else if (c=='R') { /* reset palette */
1868 reset_palette(vc);
1869 vc->vc_state = ESnormal;
63f3a16d
AB		 1870 } else if (c>='0' && c<='9')
1871 vc->vc_state = ESosc;
1872 else
1da177e4
LT		 1873 vc->vc_state = ESnormal;
1874 return;
1875 case ESpalette:
74c807ce
AS		 1876 if (isxdigit(c)) {
1877 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1878 if (vc->vc_npar == 7) {
1879 int i = vc->vc_par[0] * 3, j = 1;
1880 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1881 vc->vc_palette[i++] += vc->vc_par[j++];
1882 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1883 vc->vc_palette[i++] += vc->vc_par[j++];
1884 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1885 vc->vc_palette[i] += vc->vc_par[j];
1886 set_palette(vc);
1887 vc->vc_state = ESnormal;
1888 }
1889 } else
1890 vc->vc_state = ESnormal;
1891 return;
1892 case ESsquare:
1893 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1894 vc->vc_par[vc->vc_npar] = 0;
1895 vc->vc_npar = 0;
1896 vc->vc_state = ESgetpars;
1897 if (c == '[') { /* Function key */
1898 vc->vc_state=ESfunckey;
1899 return;
1900 }
1901 vc->vc_ques = (c == '?');
1902 if (vc->vc_ques)
1903 return;
1904 case ESgetpars:
1905 if (c == ';' && vc->vc_npar < NPAR - 1) {
1906 vc->vc_npar++;
1907 return;
1908 } else if (c>='0' && c<='9') {
1909 vc->vc_par[vc->vc_npar] *= 10;
1910 vc->vc_par[vc->vc_npar] += c - '0';
1911 return;
b290af68 1912 }
1da177e4
LT		 1913 vc->vc_state = ESnormal;
1914 switch(c) {
1915 case 'h':
1916 set_mode(vc, 1);
1917 return;
1918 case 'l':
1919 set_mode(vc, 0);
1920 return;
1921 case 'c':
1922 if (vc->vc_ques) {
1923 if (vc->vc_par[0])
1924 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1925 else
9ea9a886 1926 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1927 return;
1928 }
1929 break;
1930 case 'm':
1931 if (vc->vc_ques) {
1932 clear_selection();
1933 if (vc->vc_par[0])
1934 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1935 else
1936 vc->vc_complement_mask = vc->vc_s_complement_mask;
1937 return;
1938 }
1939 break;
1940 case 'n':
1941 if (!vc->vc_ques) {
1942 if (vc->vc_par[0] == 5)
1943 status_report(tty);
1944 else if (vc->vc_par[0] == 6)
1945 cursor_report(vc, tty);
1946 }
1947 return;
1948 }
1949 if (vc->vc_ques) {
1950 vc->vc_ques = 0;
1951 return;
1952 }
1953 switch(c) {
1954 case 'G': case '`':
1955 if (vc->vc_par[0])
1956 vc->vc_par[0]--;
1957 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1958 return;
1959 case 'A':
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 'B': case 'e':
1965 if (!vc->vc_par[0])
1966 vc->vc_par[0]++;
1967 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1968 return;
1969 case 'C': case 'a':
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 'D':
1975 if (!vc->vc_par[0])
1976 vc->vc_par[0]++;
1977 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1978 return;
1979 case 'E':
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 'F':
1985 if (!vc->vc_par[0])
1986 vc->vc_par[0]++;
1987 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1988 return;
1989 case 'd':
1990 if (vc->vc_par[0])
1991 vc->vc_par[0]--;
1992 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1993 return;
1994 case 'H': case 'f':
1995 if (vc->vc_par[0])
1996 vc->vc_par[0]--;
1997 if (vc->vc_par[1])
1998 vc->vc_par[1]--;
1999 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2000 return;
2001 case 'J':
2002 csi_J(vc, vc->vc_par[0]);
2003 return;
2004 case 'K':
2005 csi_K(vc, vc->vc_par[0]);
2006 return;
2007 case 'L':
2008 csi_L(vc, vc->vc_par[0]);
2009 return;
2010 case 'M':
2011 csi_M(vc, vc->vc_par[0]);
2012 return;
2013 case 'P':
2014 csi_P(vc, vc->vc_par[0]);
2015 return;
2016 case 'c':
2017 if (!vc->vc_par[0])
2018 respond_ID(tty);
2019 return;
2020 case 'g':
2021 if (!vc->vc_par[0])
2022 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2023 else if (vc->vc_par[0] == 3) {
2024 vc->vc_tab_stop[0] =
2025 vc->vc_tab_stop[1] =
2026 vc->vc_tab_stop[2] =
2027 vc->vc_tab_stop[3] =
a564738c
WK		 2028 vc->vc_tab_stop[4] =
2029 vc->vc_tab_stop[5] =
2030 vc->vc_tab_stop[6] =
2031 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 2032 }
2033 return;
2034 case 'm':
2035 csi_m(vc);
2036 return;
2037 case 'q': /* DECLL - but only 3 leds */
2038 /* map 0,1,2,3 to 0,1,2,4 */
2039 if (vc->vc_par[0] < 4)
079c9534 2040 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2041 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2042 return;
2043 case 'r':
2044 if (!vc->vc_par[0])
2045 vc->vc_par[0]++;
2046 if (!vc->vc_par[1])
2047 vc->vc_par[1] = vc->vc_rows;
2048 /* Minimum allowed region is 2 lines */
2049 if (vc->vc_par[0] < vc->vc_par[1] &&
2050 vc->vc_par[1] <= vc->vc_rows) {
2051 vc->vc_top = vc->vc_par[0] - 1;
2052 vc->vc_bottom = vc->vc_par[1];
2053 gotoxay(vc, 0, 0);
2054 }
2055 return;
2056 case 's':
2057 save_cur(vc);
2058 return;
2059 case 'u':
2060 restore_cur(vc);
2061 return;
2062 case 'X':
2063 csi_X(vc, vc->vc_par[0]);
2064 return;
2065 case '@':
2066 csi_at(vc, vc->vc_par[0]);
2067 return;
2068 case ']': /* setterm functions */
2069 setterm_command(vc);
2070 return;
2071 }
2072 return;
2073 case ESpercent:
2074 vc->vc_state = ESnormal;
2075 switch (c) {
2076 case '@': /* defined in ISO 2022 */
2077 vc->vc_utf = 0;
2078 return;
2079 case 'G': /* prelim official escape code */
2080 case '8': /* retained for compatibility */
2081 vc->vc_utf = 1;
2082 return;
2083 }
2084 return;
2085 case ESfunckey:
2086 vc->vc_state = ESnormal;
2087 return;
2088 case EShash:
2089 vc->vc_state = ESnormal;
2090 if (c == '8') {
2091 /* DEC screen alignment test. kludge :-) */
2092 vc->vc_video_erase_char =
2093 (vc->vc_video_erase_char & 0xff00) | 'E';
2094 csi_J(vc, 2);
2095 vc->vc_video_erase_char =
2096 (vc->vc_video_erase_char & 0xff00) | ' ';
2097 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2098 }
2099 return;
2100 case ESsetG0:
2101 if (c == '0')
2102 vc->vc_G0_charset = GRAF_MAP;
2103 else if (c == 'B')
2104 vc->vc_G0_charset = LAT1_MAP;
2105 else if (c == 'U')
2106 vc->vc_G0_charset = IBMPC_MAP;
2107 else if (c == 'K')
2108 vc->vc_G0_charset = USER_MAP;
2109 if (vc->vc_charset == 0)
2110 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2111 vc->vc_state = ESnormal;
2112 return;
2113 case ESsetG1:
2114 if (c == '0')
2115 vc->vc_G1_charset = GRAF_MAP;
2116 else if (c == 'B')
2117 vc->vc_G1_charset = LAT1_MAP;
2118 else if (c == 'U')
2119 vc->vc_G1_charset = IBMPC_MAP;
2120 else if (c == 'K')
2121 vc->vc_G1_charset = USER_MAP;
2122 if (vc->vc_charset == 1)
2123 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2124 vc->vc_state = ESnormal;
2125 return;
63f3a16d
AB		 2126 case ESosc:
2127 return;
1da177e4
LT		 2128 default:
2129 vc->vc_state = ESnormal;
2130 }
2131}
2132
2f1a2ccb 2133/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2134 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2135 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2136 */
2137struct interval {
2138 uint32_t first;
2139 uint32_t last;
2140};
2141
2142static int bisearch(uint32_t ucs, const struct interval *table, int max)
2143{
2144 int min = 0;
2145 int mid;
2146
2147 if (ucs < table[0].first || ucs > table[max].last)
2148 return 0;
2149 while (max >= min) {
2150 mid = (min + max) / 2;
2151 if (ucs > table[mid].last)
2152 min = mid + 1;
2153 else if (ucs < table[mid].first)
2154 max = mid - 1;
2155 else
2156 return 1;
2157 }
2158 return 0;
2159}
2160
2161static int is_double_width(uint32_t ucs)
2162{
2163 static const struct interval double_width[] = {
2164 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2165 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2166 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2167 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2168 };
0f11541b 2169 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2170}
2171
d711ea8f
JS		 2172static void con_flush(struct vc_data *vc, unsigned long draw_from,
2173 unsigned long draw_to, int *draw_x)
2174{
2175 if (*draw_x < 0)
2176 return;
2177
2178 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2179 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2180 *draw_x = -1;
2181}
2182
ac751efa 2183/* acquires console_lock */
1da177e4
LT		 2184static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2185{
1da177e4
LT		 2186 int c, tc, ok, n = 0, draw_x = -1;
2187 unsigned int currcons;
2188 unsigned long draw_from = 0, draw_to = 0;
2189 struct vc_data *vc;
2f1a2ccb 2190 unsigned char vc_attr;
0341a4d0 2191 struct vt_notifier_param param;
2f1a2ccb
EK		 2192 uint8_t rescan;
2193 uint8_t inverse;
2194 uint8_t width;
1da177e4 2195 u16 himask, charmask;
1da177e4
LT		 2196
2197 if (in_interrupt())
2198 return count;
2199
2200 might_sleep();
2201
ac751efa 2202 console_lock();
1da177e4
LT		 2203 vc = tty->driver_data;
2204 if (vc == NULL) {
2205 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2206 console_unlock();
1da177e4
LT		 2207 return 0;
2208 }
2209
2210 currcons = vc->vc_num;
2211 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2212 /* could this happen? */
2213 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2214 console_unlock();
2215 return 0;
1da177e4 2216 }
1da177e4 2217
1da177e4
LT		 2218 himask = vc->vc_hi_font_mask;
2219 charmask = himask ? 0x1ff : 0xff;
2220
2221 /* undraw cursor first */
6ca8dfd7 2222 if (con_is_fg(vc))
1da177e4
LT		 2223 hide_cursor(vc);
2224
0341a4d0
KD		 2225 param.vc = vc;
2226
1da177e4
LT		 2227 while (!tty->stopped && count) {
2228 int orig = *buf;
2229 c = orig;
2230 buf++;
2231 n++;
2232 count--;
2f1a2ccb
EK		 2233 rescan = 0;
2234 inverse = 0;
2235 width = 1;
1da177e4
LT		 2236
2237 /* Do no translation at all in control states */
2238 if (vc->vc_state != ESnormal) {
2239 tc = c;
d4328b40 2240 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2241 /* Combine UTF-8 into Unicode in vc_utf_char.
2242 * vc_utf_count is the number of continuation bytes still
2243 * expected to arrive.
2244 * vc_npar is the number of continuation bytes arrived so
2245 * far
2246 */
d4328b40 2247rescan_last_byte:
2f1a2ccb
EK		 2248 if ((c & 0xc0) == 0x80) {
2249 /* Continuation byte received */
2250 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2251 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2252 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2253 vc->vc_npar++;
2254 if (--vc->vc_utf_count) {
2255 /* Still need some bytes */
1da177e4 2256 continue;
2f1a2ccb
EK		 2257 }
2258 /* Got a whole character */
2259 c = vc->vc_utf_char;
2260 /* Reject overlong sequences */
2261 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2262 c > utf8_length_changes[vc->vc_npar])
2263 c = 0xfffd;
2264 } else {
2265 /* Unexpected continuation byte */
2266 vc->vc_utf_count = 0;
2267 c = 0xfffd;
2268 }
1da177e4 2269 } else {
2f1a2ccb
EK		 2270 /* Single ASCII byte or first byte of a sequence received */
2271 if (vc->vc_utf_count) {
2272 /* Continuation byte expected */
2273 rescan = 1;
2274 vc->vc_utf_count = 0;
2275 c = 0xfffd;
2276 } else if (c > 0x7f) {
2277 /* First byte of a multibyte sequence received */
2278 vc->vc_npar = 0;
2279 if ((c & 0xe0) == 0xc0) {
2280 vc->vc_utf_count = 1;
2281 vc->vc_utf_char = (c & 0x1f);
2282 } else if ((c & 0xf0) == 0xe0) {
2283 vc->vc_utf_count = 2;
2284 vc->vc_utf_char = (c & 0x0f);
2285 } else if ((c & 0xf8) == 0xf0) {
2286 vc->vc_utf_count = 3;
2287 vc->vc_utf_char = (c & 0x07);
2288 } else if ((c & 0xfc) == 0xf8) {
2289 vc->vc_utf_count = 4;
2290 vc->vc_utf_char = (c & 0x03);
2291 } else if ((c & 0xfe) == 0xfc) {
2292 vc->vc_utf_count = 5;
2293 vc->vc_utf_char = (c & 0x01);
2294 } else {
2295 /* 254 and 255 are invalid */
2296 c = 0xfffd;
2297 }
2298 if (vc->vc_utf_count) {
2299 /* Still need some bytes */
2300 continue;
2301 }
2302 }
2303 /* Nothing to do if an ASCII byte was received */
1da177e4 2304 }
2f1a2ccb
EK		 2305 /* End of UTF-8 decoding. */
2306 /* c is the received character, or U+FFFD for invalid sequences. */
2307 /* Replace invalid Unicode code points with U+FFFD too */
2308 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2309 c = 0xfffd;
2310 tc = c;
d4328b40 2311 } else { /* no utf or alternate charset mode */
a29ccf6f 2312 tc = vc_translate(vc, c);
1da177e4
LT		 2313 }
2314
0341a4d0
KD		 2315 param.c = tc;
2316 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2317 &param) == NOTIFY_STOP)
2318 continue;
2319
1da177e4
LT		 2320 /* If the original code was a control character we
2321 * only allow a glyph to be displayed if the code is
2322 * not normally used (such as for cursor movement) or
2323 * if the disp_ctrl mode has been explicitly enabled.
2324 * Certain characters (as given by the CTRL_ALWAYS
2325 * bitmap) are always displayed as control characters,
2326 * as the console would be pretty useless without
2327 * them; to display an arbitrary font position use the
2328 * direct-to-font zone in UTF-8 mode.
2329 */
2330 ok = tc && (c >= 32 ||
d4328b40
AT		 2331 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2332 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2333 && (c != 127 || vc->vc_disp_ctrl)
2334 && (c != 128+27);
2335
2336 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2337 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2338 if (is_double_width(c))
2339 width = 2;
2340 }
1da177e4
LT		 2341 /* Now try to find out how to display it */
2342 tc = conv_uni_to_pc(vc, tc);
d4328b40 2343 if (tc & ~charmask) {
2f1a2ccb
EK		 2344 if (tc == -1 || tc == -2) {
2345 continue; /* nothing to display */
2346 }
2347 /* Glyph not found */
c0b79882 2348 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2349 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2350 This would make absolutely no sense with Unicode in mind,
2351 but do this for ASCII characters since a font may lack
2352 Unicode mapping info and we don't want to end up with
2353 having question marks only. */
2f1a2ccb
EK		 2354 tc = c;
2355 } else {
2356 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2357 tc = conv_uni_to_pc(vc, 0xfffd);
2358 if (tc < 0) {
2359 inverse = 1;
2360 tc = conv_uni_to_pc(vc, '?');
2361 if (tc < 0) tc = '?';
2362 }
2363 }
d4328b40 2364 }
1da177e4 2365
2f1a2ccb
EK		 2366 if (!inverse) {
2367 vc_attr = vc->vc_attr;
1da177e4 2368 } else {
2f1a2ccb
EK		 2369 /* invert vc_attr */
2370 if (!vc->vc_can_do_color) {
2371 vc_attr = (vc->vc_attr) ^ 0x08;
2372 } else if (vc->vc_hi_font_mask == 0x100) {
2373 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2374 } else {
2375 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2376 }
d711ea8f 2377 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4 2378 }
2f1a2ccb
EK		 2379
2380 while (1) {
2381 if (vc->vc_need_wrap || vc->vc_decim)
d711ea8f
JS		 2382 con_flush(vc, draw_from, draw_to,
2383 &draw_x);
2f1a2ccb
EK		 2384 if (vc->vc_need_wrap) {
2385 cr(vc);
2386 lf(vc);
2387 }
2388 if (vc->vc_decim)
2389 insert_char(vc, 1);
2390 scr_writew(himask ?
2391 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2392 (vc_attr << 8) + tc,
2393 (u16 *) vc->vc_pos);
6ca8dfd7 2394 if (con_should_update(vc) && draw_x < 0) {
2f1a2ccb
EK		 2395 draw_x = vc->vc_x;
2396 draw_from = vc->vc_pos;
2397 }
2398 if (vc->vc_x == vc->vc_cols - 1) {
2399 vc->vc_need_wrap = vc->vc_decawm;
2400 draw_to = vc->vc_pos + 2;
2401 } else {
2402 vc->vc_x++;
2403 draw_to = (vc->vc_pos += 2);
d4328b40 2404 }
2f1a2ccb
EK		 2405
2406 if (!--width) break;
2407
2408 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2409 if (tc < 0) tc = ' ';
2410 }
b293d758 2411 notify_write(vc, c);
2f1a2ccb 2412
d711ea8f
JS		 2413 if (inverse)
2414 con_flush(vc, draw_from, draw_to, &draw_x);
1ed8a2b3 2415
2f1a2ccb
EK		 2416 if (rescan) {
2417 rescan = 0;
2418 inverse = 0;
2419 width = 1;
d4328b40
AT		 2420 c = orig;
2421 goto rescan_last_byte;
2422 }
1da177e4
LT		 2423 continue;
2424 }
d711ea8f 2425 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4
LT		 2426 do_con_trol(tty, vc, orig);
2427 }
d711ea8f 2428 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4 2429 console_conditional_schedule();
ac751efa 2430 console_unlock();
b293d758 2431 notify_update(vc);
1da177e4 2432 return n;
1da177e4
LT		 2433}
2434
2435/*
2436 * This is the console switching callback.
2437 *
2438 * Doing console switching in a process context allows
2439 * us to do the switches asynchronously (needed when we want
2440 * to switch due to a keyboard interrupt). Synchronization
2441 * with other console code and prevention of re-entrancy is
ac751efa 2442 * ensured with console_lock.
1da177e4 2443 */
65f27f38 2444static void console_callback(struct work_struct *ignored)
1da177e4 2445{
ac751efa 2446 console_lock();
1da177e4
LT		 2447
2448 if (want_console >= 0) {
2449 if (want_console != fg_console &&
2450 vc_cons_allocated(want_console)) {
2451 hide_cursor(vc_cons[fg_console].d);
2452 change_console(vc_cons[want_console].d);
2453 /* we only changed when the console had already
2454 been allocated - a new console is not created
2455 in an interrupt routine */
2456 }
2457 want_console = -1;
2458 }
2459 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2460 do_poke_blanked_console = 0;
2461 poke_blanked_console();
2462 }
2463 if (scrollback_delta) {
2464 struct vc_data *vc = vc_cons[fg_console].d;
2465 clear_selection();
97293de9 2466 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
1da177e4
LT		 2467 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2468 scrollback_delta = 0;
2469 }
2470 if (blank_timer_expired) {
2471 do_blank_screen(0);
2472 blank_timer_expired = 0;
2473 }
b293d758 2474 notify_update(vc_cons[fg_console].d);
1da177e4 2475
ac751efa 2476 console_unlock();
1da177e4
LT		 2477}
2478
b257bc05 2479int set_console(int nr)
1da177e4 2480{
b257bc05
AJ		 2481 struct vc_data *vc = vc_cons[fg_console].d;
2482
2483 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2484 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2485
2486 /*
2487 * Console switch will fail in console_callback() or
2488 * change_console() so there is no point scheduling
2489 * the callback
2490 *
2491 * Existing set_console() users don't check the return
2492 * value so this shouldn't break anything
2493 */
2494 return -EINVAL;
2495 }
2496
1da177e4
LT		 2497 want_console = nr;
2498 schedule_console_callback();
b257bc05
AJ		 2499
2500 return 0;
1da177e4
LT		 2501}
2502
2503struct tty_driver *console_driver;
2504
2505#ifdef CONFIG_VT_CONSOLE
2506
5ada918b
BW		 2507/**
2508 * vt_kmsg_redirect() - Sets/gets the kernel message console
2509 * @new: The new virtual terminal number or -1 if the console should stay
2510 * unchanged
2511 *
2512 * By default, the kernel messages are always printed on the current virtual
2513 * console. However, the user may modify that default with the
2514 * TIOCL_SETKMSGREDIRECT ioctl call.
2515 *
2516 * This function sets the kernel message console to be @new. It returns the old
2517 * virtual console number. The virtual terminal number 0 (both as parameter and
2518 * return value) means no redirection (i.e. always printed on the currently
2519 * active console).
2520 *
2521 * The parameter -1 means that only the current console is returned, but the
2522 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2523 * case to make the code more understandable.
2524 *
2525 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2526 * the parameter and always returns 0.
2527 */
2528int vt_kmsg_redirect(int new)
2529{
2530 static int kmsg_con;
2531
2532 if (new != -1)
2533 return xchg(&kmsg_con, new);
2534 else
2535 return kmsg_con;
2536}
2537
1da177e4
LT		 2538/*
2539 * Console on virtual terminal
2540 *
2541 * The console must be locked when we get here.
2542 */
2543
2544static void vt_console_print(struct console *co, const char *b, unsigned count)
2545{
2546 struct vc_data *vc = vc_cons[fg_console].d;
2547 unsigned char c;
b0940003 2548 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2549 const ushort *start;
2550 ushort cnt = 0;
2551 ushort myx;
5ada918b 2552 int kmsg_console;
1da177e4
LT		 2553
2554 /* console busy or not yet initialized */
b0940003
NP		 2555 if (!printable)
2556 return;
2557 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2558 return;
2559
5ada918b
BW		 2560 kmsg_console = vt_get_kmsg_redirect();
2561 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2562 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2563
2564 /* read `x' only after setting currcons properly (otherwise
2565 the `x' macro will read the x of the foreground console). */
2566 myx = vc->vc_x;
2567
2568 if (!vc_cons_allocated(fg_console)) {
2569 /* impossible */
2570 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2571 goto quit;
2572 }
2573
8fd4bd22 2574 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2575 goto quit;
2576
2577 /* undraw cursor first */
6ca8dfd7 2578 if (con_is_fg(vc))
1da177e4
LT		 2579 hide_cursor(vc);
2580
2581 start = (ushort *)vc->vc_pos;
2582
2583 /* Contrived structure to try to emulate original need_wrap behaviour
2584 * Problems caused when we have need_wrap set on '\n' character */
2585 while (count--) {
2586 c = *b++;
2587 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2588 if (cnt > 0) {
6ca8dfd7 2589 if (con_is_visible(vc))
1da177e4
LT		 2590 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2591 vc->vc_x += cnt;
2592 if (vc->vc_need_wrap)
2593 vc->vc_x--;
2594 cnt = 0;
2595 }
2596 if (c == 8) { /* backspace */
2597 bs(vc);
2598 start = (ushort *)vc->vc_pos;
2599 myx = vc->vc_x;
2600 continue;
2601 }
2602 if (c != 13)
2603 lf(vc);
2604 cr(vc);
2605 start = (ushort *)vc->vc_pos;
2606 myx = vc->vc_x;
2607 if (c == 10 || c == 13)
2608 continue;
2609 }
2610 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2611 notify_write(vc, c);
1da177e4
LT		 2612 cnt++;
2613 if (myx == vc->vc_cols - 1) {
2614 vc->vc_need_wrap = 1;
2615 continue;
2616 }
2617 vc->vc_pos += 2;
2618 myx++;
2619 }
2620 if (cnt > 0) {
6ca8dfd7 2621 if (con_is_visible(vc))
1da177e4
LT		 2622 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2623 vc->vc_x += cnt;
2624 if (vc->vc_x == vc->vc_cols) {
2625 vc->vc_x--;
2626 vc->vc_need_wrap = 1;
2627 }
2628 }
2629 set_cursor(vc);
b293d758 2630 notify_update(vc);
1da177e4
LT		 2631
2632quit:
b0940003 2633 spin_unlock(&printing_lock);
1da177e4
LT		 2634}
2635
2636static struct tty_driver *vt_console_device(struct console *c, int *index)
2637{
2638 *index = c->index ? c->index-1 : fg_console;
2639 return console_driver;
2640}
2641
2642static struct console vt_console_driver = {
2643 .name = "tty",
2644 .write = vt_console_print,
2645 .device = vt_console_device,
2646 .unblank = unblank_screen,
2647 .flags = CON_PRINTBUFFER,
2648 .index = -1,
2649};
2650#endif
2651
2652/*
2653 * Handling of Linux-specific VC ioctls
2654 */
2655
2656/*
ac751efa 2657 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2658 *
2659 * There are some functions which don't need it.
2660 *
2661 * There are some functions which can sleep for arbitrary periods
2662 * (paste_selection) but we don't need the lock there anyway.
2663 *
2664 * set_selection has locking, and definitely needs it
2665 */
2666
2667int tioclinux(struct tty_struct *tty, unsigned long arg)
2668{
2669 char type, data;
2670 char __user *p = (char __user *)arg;
2671 int lines;
2672 int ret;
2673
1da177e4
LT		 2674 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2675 return -EPERM;
2676 if (get_user(type, p))
2677 return -EFAULT;
2678 ret = 0;
04f378b1 2679
1da177e4
LT		 2680 switch (type)
2681 {
2682 case TIOCL_SETSEL:
ac751efa 2683 console_lock();
1da177e4 2684 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2685 console_unlock();
1da177e4
LT		 2686 break;
2687 case TIOCL_PASTESEL:
2688 ret = paste_selection(tty);
2689 break;
2690 case TIOCL_UNBLANKSCREEN:
ac751efa 2691 console_lock();
1da177e4 2692 unblank_screen();
ac751efa 2693 console_unlock();
1da177e4
LT		 2694 break;
2695 case TIOCL_SELLOADLUT:
5289475d 2696 console_lock();
1da177e4 2697 ret = sel_loadlut(p);
5289475d 2698 console_unlock();
1da177e4
LT		 2699 break;
2700 case TIOCL_GETSHIFTSTATE:
04f378b1 2701
1da177e4
LT		 2702 /*
2703 * Make it possible to react to Shift+Mousebutton.
2704 * Note that 'shift_state' is an undocumented
2705 * kernel-internal variable; programs not closely
2706 * related to the kernel should not use this.
2707 */
079c9534 2708 data = vt_get_shift_state();
1da177e4
LT		 2709 ret = __put_user(data, p);
2710 break;
2711 case TIOCL_GETMOUSEREPORTING:
20f62579 2712 console_lock(); /* May be overkill */
1da177e4 2713 data = mouse_reporting();
20f62579 2714 console_unlock();
1da177e4
LT		 2715 ret = __put_user(data, p);
2716 break;
2717 case TIOCL_SETVESABLANK:
20f62579 2718 console_lock();
403aac96 2719 ret = set_vesa_blanking(p);
20f62579 2720 console_unlock();
1da177e4 2721 break;
0ca07731 2722 case TIOCL_GETKMSGREDIRECT:
5ada918b 2723 data = vt_get_kmsg_redirect();
0ca07731
RW		 2724 ret = __put_user(data, p);
2725 break;
1da177e4
LT		 2726 case TIOCL_SETKMSGREDIRECT:
2727 if (!capable(CAP_SYS_ADMIN)) {
2728 ret = -EPERM;
2729 } else {
2730 if (get_user(data, p+1))
2731 ret = -EFAULT;
2732 else
5ada918b 2733 vt_kmsg_redirect(data);
1da177e4
LT		 2734 }
2735 break;
2736 case TIOCL_GETFGCONSOLE:
20f62579
AC		 2737 /* No locking needed as this is a transiently
2738 correct return anyway if the caller hasn't
2739 disabled switching */
1da177e4
LT		 2740 ret = fg_console;
2741 break;
2742 case TIOCL_SCROLLCONSOLE:
2743 if (get_user(lines, (s32 __user *)(p+4))) {
2744 ret = -EFAULT;
2745 } else {
20f62579
AC		 2746 /* Need the console lock here. Note that lots
2747 of other calls need fixing before the lock
2748 is actually useful ! */
2749 console_lock();
1da177e4 2750 scrollfront(vc_cons[fg_console].d, lines);
20f62579 2751 console_unlock();
1da177e4
LT		 2752 ret = 0;
2753 }
2754 break;
2755 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2756 console_lock();
1da177e4
LT		 2757 ignore_poke = 1;
2758 do_blank_screen(0);
ac751efa 2759 console_unlock();
1da177e4
LT		 2760 break;
2761 case TIOCL_BLANKEDSCREEN:
2762 ret = console_blanked;
2763 break;
2764 default:
2765 ret = -EINVAL;
2766 break;
2767 }
2768 return ret;
2769}
2770
2771/*
2772 * /dev/ttyN handling
2773 */
2774
2775static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2776{
2777 int retval;
2778
2779 retval = do_con_write(tty, buf, count);
2780 con_flush_chars(tty);
2781
2782 return retval;
2783}
2784
5d19f546 2785static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2786{
2787 if (in_interrupt())
5d19f546
AC		 2788 return 0; /* n_r3964 calls put_char() from interrupt context */
2789 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2790}
2791
2792static int con_write_room(struct tty_struct *tty)
2793{
2794 if (tty->stopped)
2795 return 0;
a88a69c9 2796 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2797}
2798
2799static int con_chars_in_buffer(struct tty_struct *tty)
2800{
2801 return 0; /* we're not buffering */
2802}
2803
2804/*
2805 * con_throttle and con_unthrottle are only used for
2806 * paste_selection(), which has to stuff in a large number of
2807 * characters...
2808 */
2809static void con_throttle(struct tty_struct *tty)
2810{
2811}
2812
2813static void con_unthrottle(struct tty_struct *tty)
2814{
2815 struct vc_data *vc = tty->driver_data;
2816
2817 wake_up_interruptible(&vc->paste_wait);
2818}
2819
2820/*
2821 * Turn the Scroll-Lock LED on when the tty is stopped
2822 */
2823static void con_stop(struct tty_struct *tty)
2824{
2825 int console_num;
2826 if (!tty)
2827 return;
2828 console_num = tty->index;
2829 if (!vc_cons_allocated(console_num))
2830 return;
079c9534 2831 vt_kbd_con_stop(console_num);
1da177e4
LT		 2832}
2833
2834/*
2835 * Turn the Scroll-Lock LED off when the console is started
2836 */
2837static void con_start(struct tty_struct *tty)
2838{
2839 int console_num;
2840 if (!tty)
2841 return;
2842 console_num = tty->index;
2843 if (!vc_cons_allocated(console_num))
2844 return;
079c9534 2845 vt_kbd_con_start(console_num);
1da177e4
LT		 2846}
2847
2848static void con_flush_chars(struct tty_struct *tty)
2849{
2850 struct vc_data *vc;
2851
2852 if (in_interrupt()) /* from flush_to_ldisc */
2853 return;
2854
2855 /* if we race with con_close(), vt may be null */
ac751efa 2856 console_lock();
1da177e4
LT		 2857 vc = tty->driver_data;
2858 if (vc)
2859 set_cursor(vc);
ac751efa 2860 console_unlock();
1da177e4
LT		 2861}
2862
2863/*
2864 * Allocate the console screen memory.
2865 */
bc1e99d9 2866static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 2867{
2868 unsigned int currcons = tty->index;
bc1e99d9
JS		 2869 struct vc_data *vc;
2870 int ret;
1da177e4 2871
ac751efa 2872 console_lock();
bc1e99d9
JS		 2873 ret = vc_allocate(currcons);
2874 if (ret)
2875 goto unlock;
feebed65 2876
bc1e99d9 2877 vc = vc_cons[currcons].d;
1da177e4 2878
bc1e99d9
JS		 2879 /* Still being freed */
2880 if (vc->port.tty) {
2881 ret = -ERESTARTSYS;
2882 goto unlock;
2883 }
2884
2885 ret = tty_port_install(&vc->port, driver, tty);
2886 if (ret)
2887 goto unlock;
2888
2889 tty->driver_data = vc;
2890 vc->port.tty = tty;
2891
2892 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2893 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2894 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 2895 }
bc1e99d9 2896 if (vc->vc_utf)
adc8d746 2897 tty->termios.c_iflag |= IUTF8;
bc1e99d9 2898 else
adc8d746 2899 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 2900unlock:
ac751efa 2901 console_unlock();
1da177e4
LT		 2902 return ret;
2903}
2904
bc1e99d9
JS		 2905static int con_open(struct tty_struct *tty, struct file *filp)
2906{
2907 /* everything done in install */
2908 return 0;
2909}
2910
2911
1da177e4
LT		 2912static void con_close(struct tty_struct *tty, struct file *filp)
2913{
feebed65
AC		 2914 /* Nothing to do - we defer to shutdown */
2915}
1da177e4 2916
feebed65
AC		 2917static void con_shutdown(struct tty_struct *tty)
2918{
2919 struct vc_data *vc = tty->driver_data;
2920 BUG_ON(vc == NULL);
ac751efa 2921 console_lock();
8ce73264 2922 vc->port.tty = NULL;
ac751efa 2923 console_unlock();
1da177e4
LT		 2924}
2925
3855ae1c 2926static int default_color = 7; /* white */
fa6ce9ab
JE		 2927static int default_italic_color = 2; // green (ASCII)
2928static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 2929module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 2930module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2931module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2932
1da177e4
LT		 2933static void vc_init(struct vc_data *vc, unsigned int rows,
2934 unsigned int cols, int do_clear)
2935{
2936 int j, k ;
2937
2938 vc->vc_cols = cols;
2939 vc->vc_rows = rows;
2940 vc->vc_size_row = cols << 1;
2941 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2942
2943 set_origin(vc);
2944 vc->vc_pos = vc->vc_origin;
2945 reset_vc(vc);
2946 for (j=k=0; j<16; j++) {
2947 vc->vc_palette[k++] = default_red[j] ;
2948 vc->vc_palette[k++] = default_grn[j] ;
2949 vc->vc_palette[k++] = default_blu[j] ;
2950 }
3855ae1c 2951 vc->vc_def_color = default_color;
fa6ce9ab
JE		 2952 vc->vc_ulcolor = default_underline_color;
2953 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2954 vc->vc_halfcolor = 0x08; /* grey */
2955 init_waitqueue_head(&vc->paste_wait);
2956 reset_terminal(vc, do_clear);
2957}
2958
2959/*
2960 * This routine initializes console interrupts, and does nothing
2961 * else. If you want the screen to clear, call tty_write with
2962 * the appropriate escape-sequence.
2963 */
2964
2965static int __init con_init(void)
2966{
2967 const char *display_desc = NULL;
2968 struct vc_data *vc;
3e795de7 2969 unsigned int currcons = 0, i;
1da177e4 2970
ac751efa 2971 console_lock();
1da177e4
LT		 2972
2973 if (conswitchp)
2974 display_desc = conswitchp->con_startup();
2975 if (!display_desc) {
2976 fg_console = 0;
ac751efa 2977 console_unlock();
1da177e4
LT		 2978 return 0;
2979 }
2980
3e795de7
AD		 2981 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2982 struct con_driver *con_driver = &registered_con_driver[i];
2983
2984 if (con_driver->con == NULL) {
2985 con_driver->con = conswitchp;
2986 con_driver->desc = display_desc;
2987 con_driver->flag = CON_DRIVER_FLAG_INIT;
2988 con_driver->first = 0;
2989 con_driver->last = MAX_NR_CONSOLES - 1;
2990 break;
2991 }
2992 }
2993
2994 for (i = 0; i < MAX_NR_CONSOLES; i++)
2995 con_driver_map[i] = conswitchp;
2996
1da177e4
LT		 2997 if (blankinterval) {
2998 blank_state = blank_normal_wait;
f324edc8 2999 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3000 }
3001
1da177e4 3002 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 3003 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 3004 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 3005 tty_port_init(&vc->port);
1da177e4 3006 visual_init(vc, currcons, 1);
a5f4f52e 3007 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 3008 vc_init(vc, vc->vc_rows, vc->vc_cols,
3009 currcons || !vc->vc_sw->con_save_screen);
3010 }
3011 currcons = fg_console = 0;
3012 master_display_fg = vc = vc_cons[currcons].d;
3013 set_origin(vc);
3014 save_screen(vc);
3015 gotoxy(vc, vc->vc_x, vc->vc_y);
3016 csi_J(vc, 0);
3017 update_screen(vc);
5da527aa 3018 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3019 vc->vc_can_do_color ? "colour" : "mono",
3020 display_desc, vc->vc_cols, vc->vc_rows);
3021 printable = 1;
1da177e4 3022
ac751efa 3023 console_unlock();
1da177e4
LT		 3024
3025#ifdef CONFIG_VT_CONSOLE
3026 register_console(&vt_console_driver);
3027#endif
3028 return 0;
3029}
3030console_initcall(con_init);
3031
b68e31d0 3032static const struct tty_operations con_ops = {
bc1e99d9 3033 .install = con_install,
1da177e4
LT		 3034 .open = con_open,
3035 .close = con_close,
3036 .write = con_write,
3037 .write_room = con_write_room,
3038 .put_char = con_put_char,
3039 .flush_chars = con_flush_chars,
3040 .chars_in_buffer = con_chars_in_buffer,
3041 .ioctl = vt_ioctl,
e9216651
AB		 3042#ifdef CONFIG_COMPAT
3043 .compat_ioctl = vt_compat_ioctl,
3044#endif
1da177e4
LT		 3045 .stop = con_stop,
3046 .start = con_start,
3047 .throttle = con_throttle,
3048 .unthrottle = con_unthrottle,
8c9a9dd0 3049 .resize = vt_resize,
feebed65 3050 .shutdown = con_shutdown
1da177e4
LT		 3051};
3052
d81ed103
AC		 3053static struct cdev vc0_cdev;
3054
fbc92a34
KS		 3055static ssize_t show_tty_active(struct device *dev,
3056 struct device_attribute *attr, char *buf)
3057{
3058 return sprintf(buf, "tty%d\n", fg_console + 1);
3059}
3060static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3061
1083a7be
TI		 3062static struct attribute *vt_dev_attrs[] = {
3063 &dev_attr_active.attr,
3064 NULL
3065};
3066
3067ATTRIBUTE_GROUPS(vt_dev);
3068
d81ed103 3069int __init vty_init(const struct file_operations *console_fops)
1da177e4 3070{
d81ed103
AC		 3071 cdev_init(&vc0_cdev, console_fops);
3072 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3073 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3074 panic("Couldn't register /dev/tty0 driver\n");
1083a7be
TI		 3075 tty0dev = device_create_with_groups(tty_class, NULL,
3076 MKDEV(TTY_MAJOR, 0), NULL,
3077 vt_dev_groups, "tty0");
fbc92a34
KS		 3078 if (IS_ERR(tty0dev))
3079 tty0dev = NULL;
d81ed103 3080
1da177e4
LT		 3081 vcs_init();
3082
3083 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3084 if (!console_driver)
3085 panic("Couldn't allocate console driver\n");
2f16669d 3086
1da177e4
LT		 3087 console_driver->name = "tty";
3088 console_driver->name_base = 1;
3089 console_driver->major = TTY_MAJOR;
3090 console_driver->minor_start = 1;
3091 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3092 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3093 if (default_utf8)
3094 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3095 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3096 tty_set_operations(console_driver, &con_ops);
3097 if (tty_register_driver(console_driver))
3098 panic("Couldn't register console driver\n");
1da177e4
LT		 3099 kbd_init();
3100 console_map_init();
1da177e4
LT		 3101#ifdef CONFIG_MDA_CONSOLE
3102 mda_console_init();
3103#endif
3104 return 0;
3105}
3106
3107#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3108
3109static struct class *vtconsole_class;
3110
50e244cc 3111static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3112 int deflt)
1da177e4 3113{
3e795de7
AD		 3114 struct module *owner = csw->owner;
3115 const char *desc = NULL;
3116 struct con_driver *con_driver;
3117 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3118
1da177e4
LT		 3119 if (!try_module_get(owner))
3120 return -ENODEV;
3121
50e244cc 3122 WARN_CONSOLE_UNLOCKED();
1c8ce271 3123
3e795de7
AD		 3124 /* check if driver is registered */
3125 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3126 con_driver = &registered_con_driver[i];
3127
3128 if (con_driver->con == csw) {
3129 desc = con_driver->desc;
3130 retval = 0;
3131 break;
3132 }
3133 }
3134
3135 if (retval)
3136 goto err;
3137
3138 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3139 csw->con_startup();
3140 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3141 }
1c8ce271 3142
1da177e4
LT		 3143 if (deflt) {
3144 if (conswitchp)
3145 module_put(conswitchp->owner);
1c8ce271 3146
1da177e4
LT		 3147 __module_get(owner);
3148 conswitchp = csw;
3149 }
3150
3e795de7
AD		 3151 first = max(first, con_driver->first);
3152 last = min(last, con_driver->last);
3153
1da177e4
LT		 3154 for (i = first; i <= last; i++) {
3155 int old_was_color;
3156 struct vc_data *vc = vc_cons[i].d;
3157
3158 if (con_driver_map[i])
3159 module_put(con_driver_map[i]->owner);
3160 __module_get(owner);
3161 con_driver_map[i] = csw;
3162
3163 if (!vc || !vc->vc_sw)
3164 continue;
3165
3166 j = i;
1c8ce271 3167
6ca8dfd7 3168 if (con_is_visible(vc)) {
4ee1acce 3169 k = i;
1da177e4 3170 save_screen(vc);
4ee1acce
DH		 3171 }
3172
1da177e4
LT		 3173 old_was_color = vc->vc_can_do_color;
3174 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3175 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3176 visual_init(vc, i, 0);
1c8ce271 3177 set_origin(vc);
1da177e4
LT		 3178 update_attr(vc);
3179
3180 /* If the console changed between mono <-> color, then
3181 * the attributes in the screenbuf will be wrong. The
3182 * following resets all attributes to something sane.
3183 */
3184 if (old_was_color != vc->vc_can_do_color)
3185 clear_buffer_attributes(vc);
1da177e4 3186 }
4ee1acce 3187
1ffdda95 3188 pr_info("Console: switching ");
1da177e4 3189 if (!deflt)
4bcc595c 3190 printk(KERN_CONT "consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3191 if (j >= 0) {
3192 struct vc_data *vc = vc_cons[j].d;
3193
4bcc595c 3194 printk(KERN_CONT "to %s %s %dx%d\n",
4ee1acce
DH		 3195 vc->vc_can_do_color ? "colour" : "mono",
3196 desc, vc->vc_cols, vc->vc_rows);
3197
3198 if (k >= 0) {
3199 vc = vc_cons[k].d;
3200 update_screen(vc);
3201 }
3202 } else
4bcc595c 3203 printk(KERN_CONT "to %s\n", desc);
1da177e4 3204
3e795de7
AD		 3205 retval = 0;
3206err:
1da177e4 3207 module_put(owner);
3e795de7
AD		 3208 return retval;
3209};
1da177e4 3210
50e244cc 3211
13ae6645 3212#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86
TI		 3213/* unlocked version of unbind_con_driver() */
3214int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3215{
3e795de7
AD		 3216 struct module *owner = csw->owner;
3217 const struct consw *defcsw = NULL;
3218 struct con_driver *con_driver = NULL, *con_back = NULL;
3219 int i, retval = -ENODEV;
1da177e4 3220
3e795de7
AD		 3221 if (!try_module_get(owner))
3222 return -ENODEV;
3223
e93a9a86 3224 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3225
3226 /* check if driver is registered and if it is unbindable */
3227 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3228 con_driver = &registered_con_driver[i];
3229
3230 if (con_driver->con == csw &&
6db4063c 3231 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3232 retval = 0;
3233 break;
3234 }
3235 }
3236
e93a9a86 3237 if (retval)
3e795de7 3238 goto err;
3e795de7 3239
6db4063c
AD		 3240 retval = -ENODEV;
3241
3e795de7
AD		 3242 /* check if backup driver exists */
3243 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3244 con_back = &registered_con_driver[i];
3245
249f7b3e 3246 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3247 defcsw = con_back->con;
3248 retval = 0;
3249 break;
3250 }
3251 }
3252
e93a9a86 3253 if (retval)
3e795de7 3254 goto err;
3e795de7 3255
e93a9a86 3256 if (!con_is_bound(csw))
3e795de7 3257 goto err;
3e795de7
AD		 3258
3259 first = max(first, con_driver->first);
3260 last = min(last, con_driver->last);
3261
3262 for (i = first; i <= last; i++) {
1da177e4
LT		 3263 if (con_driver_map[i] == csw) {
3264 module_put(csw->owner);
3265 con_driver_map[i] = NULL;
3266 }
3e795de7
AD		 3267 }
3268
3269 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3270 const struct consw *defconsw = conswitchp;
3271
3e795de7
AD		 3272 defcsw->con_startup();
3273 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3274 /*
3275 * vgacon may change the default driver to point
3276 * to dummycon, we restore it here...
3277 */
3278 conswitchp = defconsw;
3e795de7
AD		 3279 }
3280
3281 if (!con_is_bound(csw))
3282 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3283
6db4063c 3284 /* ignore return value, binding should not fail */
50e244cc 3285 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3286err:
3287 module_put(owner);
3288 return retval;
3289
3290}
e93a9a86 3291EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3292
6db4063c
AD		 3293static int vt_bind(struct con_driver *con)
3294{
3295 const struct consw *defcsw = NULL, *csw = NULL;
3296 int i, more = 1, first = -1, last = -1, deflt = 0;
3297
77232f79 3298 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3299 goto err;
3300
3301 csw = con->con;
3302
3303 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3304 struct con_driver *con = &registered_con_driver[i];
3305
3306 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3307 defcsw = con->con;
3308 break;
3309 }
3310 }
3311
3312 if (!defcsw)
3313 goto err;
3314
3315 while (more) {
3316 more = 0;
3317
3318 for (i = con->first; i <= con->last; i++) {
3319 if (con_driver_map[i] == defcsw) {
3320 if (first == -1)
3321 first = i;
3322 last = i;
3323 more = 1;
3324 } else if (first != -1)
3325 break;
3326 }
3327
3328 if (first == 0 && last == MAX_NR_CONSOLES -1)
3329 deflt = 1;
3330
4c215fe8 3331 if (first != -1)
c62a1e57 3332 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3333
3334 first = -1;
3335 last = -1;
3336 deflt = 0;
3337 }
3338
3339err:
3340 return 0;
3341}
3342
3343static int vt_unbind(struct con_driver *con)
3344{
3345 const struct consw *csw = NULL;
3346 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3347 int ret;
6db4063c 3348
77232f79 3349 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3350 goto err;
3351
3352 csw = con->con;
3353
3354 while (more) {
3355 more = 0;
3356
3357 for (i = con->first; i <= con->last; i++) {
3358 if (con_driver_map[i] == csw) {
3359 if (first == -1)
3360 first = i;
3361 last = i;
3362 more = 1;
3363 } else if (first != -1)
3364 break;
3365 }
3366
3367 if (first == 0 && last == MAX_NR_CONSOLES -1)
3368 deflt = 1;
3369
618f2b90 3370 if (first != -1) {
f418f2ec 3371 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3372 if (ret != 0)
3373 return ret;
618f2b90 3374 }
6db4063c
AD		 3375
3376 first = -1;
3377 last = -1;
3378 deflt = 0;
3379 }
3380
3381err:
3382 return 0;
3383}
13ae6645
AD		 3384#else
3385static inline int vt_bind(struct con_driver *con)
3386{
3387 return 0;
3388}
3389static inline int vt_unbind(struct con_driver *con)
3390{
3391 return 0;
3392}
3393#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3394
805952a8 3395static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3396 const char *buf, size_t count)
3397{
805952a8 3398 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3399 int bind = simple_strtoul(buf, NULL, 0);
3400
4c215fe8
ID		 3401 console_lock();
3402
6db4063c
AD		 3403 if (bind)
3404 vt_bind(con);
3405 else
3406 vt_unbind(con);
3407
4c215fe8
ID		 3408 console_unlock();
3409
6db4063c
AD		 3410 return count;
3411}
3412
805952a8
GKH		 3413static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3414 char *buf)
6db4063c 3415{
805952a8 3416 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3417 int bind = con_is_bound(con->con);
3418
3419 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3420}
3421
805952a8
GKH		 3422static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3423 char *buf)
6db4063c 3424{
805952a8 3425 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3426
3427 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3428 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3429 con->desc);
3430
3431}
3432
1083a7be
TI		 3433static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3434static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3435
3436static struct attribute *con_dev_attrs[] = {
3437 &dev_attr_bind.attr,
3438 &dev_attr_name.attr,
3439 NULL
6db4063c
AD		 3440};
3441
1083a7be
TI		 3442ATTRIBUTE_GROUPS(con_dev);
3443
805952a8 3444static int vtconsole_init_device(struct con_driver *con)
6db4063c 3445{
928e964f 3446 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3447 return 0;
6db4063c
AD		 3448}
3449
805952a8 3450static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3451{
1083a7be 3452 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3453}
3454
3e795de7
AD		 3455/**
3456 * con_is_bound - checks if driver is bound to the console
3457 * @csw: console driver
3458 *
3459 * RETURNS: zero if unbound, nonzero if bound
3460 *
3461 * Drivers can call this and if zero, they should release
3462 * all resources allocated on con_startup()
3463 */
3464int con_is_bound(const struct consw *csw)
3465{
3466 int i, bound = 0;
3467
3468 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3469 if (con_driver_map[i] == csw) {
3470 bound = 1;
3471 break;
3472 }
3473 }
3474
3475 return bound;
3476}
3477EXPORT_SYMBOL(con_is_bound);
3478
b45cfba4
JB		 3479/**
3480 * con_debug_enter - prepare the console for the kernel debugger
3481 * @sw: console driver
3482 *
3483 * Called when the console is taken over by the kernel debugger, this
3484 * function needs to save the current console state, then put the console
3485 * into a state suitable for the kernel debugger.
3486 *
3487 * RETURNS:
3488 * Zero on success, nonzero if a failure occurred when trying to prepare
3489 * the console for the debugger.
3490 */
3491int con_debug_enter(struct vc_data *vc)
3492{
3493 int ret = 0;
3494
3495 saved_fg_console = fg_console;
3496 saved_last_console = last_console;
3497 saved_want_console = want_console;
3498 saved_vc_mode = vc->vc_mode;
beed5336 3499 saved_console_blanked = console_blanked;
b45cfba4
JB		 3500 vc->vc_mode = KD_TEXT;
3501 console_blanked = 0;
3502 if (vc->vc_sw->con_debug_enter)
3503 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3504#ifdef CONFIG_KGDB_KDB
3505 /* Set the initial LINES variable if it is not already set */
3506 if (vc->vc_rows < 999) {
3507 int linecount;
3508 char lns[4];
3509 const char *setargs[3] = {
3510 "set",
3511 "LINES",
3512 lns,
3513 };
3514 if (kdbgetintenv(setargs[0], &linecount)) {
3515 snprintf(lns, 4, "%i", vc->vc_rows);
3516 kdb_set(2, setargs);
3517 }
3518 }
17b572e8
JW		 3519 if (vc->vc_cols < 999) {
3520 int colcount;
3521 char cols[4];
3522 const char *setargs[3] = {
3523 "set",
3524 "COLUMNS",
3525 cols,
3526 };
3527 if (kdbgetintenv(setargs[0], &colcount)) {
3528 snprintf(cols, 4, "%i", vc->vc_cols);
3529 kdb_set(2, setargs);
3530 }
3531 }
81d44507 3532#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3533 return ret;
3534}
3535EXPORT_SYMBOL_GPL(con_debug_enter);
3536
3537/**
3538 * con_debug_leave - restore console state
3539 * @sw: console driver
3540 *
3541 * Restore the console state to what it was before the kernel debugger
3542 * was invoked.
3543 *
3544 * RETURNS:
3545 * Zero on success, nonzero if a failure occurred when trying to restore
3546 * the console.
3547 */
3548int con_debug_leave(void)
3549{
3550 struct vc_data *vc;
3551 int ret = 0;
3552
3553 fg_console = saved_fg_console;
3554 last_console = saved_last_console;
3555 want_console = saved_want_console;
beed5336 3556 console_blanked = saved_console_blanked;
b45cfba4
JB		 3557 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3558
3559 vc = vc_cons[fg_console].d;
3560 if (vc->vc_sw->con_debug_leave)
3561 ret = vc->vc_sw->con_debug_leave(vc);
3562 return ret;
3563}
3564EXPORT_SYMBOL_GPL(con_debug_leave);
3565
50e244cc 3566static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 3567{
3568 struct module *owner = csw->owner;
3569 struct con_driver *con_driver;
3570 const char *desc;
96317e9e 3571 int i, retval;
3e795de7 3572
50e244cc
AC		 3573 WARN_CONSOLE_UNLOCKED();
3574
3e795de7
AD		 3575 if (!try_module_get(owner))
3576 return -ENODEV;
3577
3e795de7
AD		 3578 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3579 con_driver = &registered_con_driver[i];
3580
3581 /* already registered */
96317e9e 3582 if (con_driver->con == csw) {
c55c63c6 3583 retval = -EBUSY;
96317e9e
JS		 3584 goto err;
3585 }
3e795de7
AD		 3586 }
3587
3e795de7 3588 desc = csw->con_startup();
6798df4c
JS		 3589 if (!desc) {
3590 retval = -ENODEV;
3e795de7 3591 goto err;
6798df4c 3592 }
3e795de7
AD		 3593
3594 retval = -EINVAL;
3595
3596 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3597 con_driver = &registered_con_driver[i];
3598
d364b5c3
ID		 3599 if (con_driver->con == NULL &&
3600 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 3601 con_driver->con = csw;
3602 con_driver->desc = desc;
6db4063c
AD		 3603 con_driver->node = i;
3604 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3605 CON_DRIVER_FLAG_INIT;
3606 con_driver->first = first;
3607 con_driver->last = last;
3608 retval = 0;
3609 break;
3610 }
3611 }
3612
6db4063c
AD		 3613 if (retval)
3614 goto err;
3615
1083a7be
TI		 3616 con_driver->dev =
3617 device_create_with_groups(vtconsole_class, NULL,
3618 MKDEV(0, con_driver->node),
3619 con_driver, con_dev_groups,
3620 "vtcon%i", con_driver->node);
805952a8
GKH		 3621 if (IS_ERR(con_driver->dev)) {
3622 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3623 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3624 PTR_ERR(con_driver->dev));
3625 con_driver->dev = NULL;
6db4063c 3626 } else {
805952a8 3627 vtconsole_init_device(con_driver);
6db4063c 3628 }
928e964f 3629
3e795de7 3630err:
3e795de7
AD		 3631 module_put(owner);
3632 return retval;
3633}
50e244cc 3634
3e795de7
AD		 3635
3636/**
50539dd4 3637 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 3638 * @csw: console driver
3639 *
3640 * DESCRIPTION: All drivers that registers to the console layer must
3641 * call this function upon exit, or if the console driver is in a state
3642 * where it won't be able to handle console services, such as the
3643 * framebuffer console without loaded framebuffer drivers.
3644 *
3645 * The driver must unbind first prior to unregistration.
3646 */
e93a9a86
TI		 3647int do_unregister_con_driver(const struct consw *csw)
3648{
d9c660e7 3649 int i;
3e795de7
AD		 3650
3651 /* cannot unregister a bound driver */
3652 if (con_is_bound(csw))
d9c660e7
DV		 3653 return -EBUSY;
3654
3655 if (csw == conswitchp)
3656 return -EINVAL;
3e795de7
AD		 3657
3658 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3659 struct con_driver *con_driver = &registered_con_driver[i];
3660
2cf30f75 3661 if (con_driver->con == csw) {
d364b5c3
ID		 3662 /*
3663 * Defer the removal of the sysfs entries since that
3664 * will acquire the kernfs s_active lock and we can't
3665 * acquire this lock while holding the console lock:
3666 * the unbind sysfs entry imposes already the opposite
3667 * order. Reset con already here to prevent any later
3668 * lookup to succeed and mark this slot as zombie, so
3669 * it won't get reused until we complete the removal
3670 * in the deferred work.
3671 */
3e795de7 3672 con_driver->con = NULL;
d364b5c3
ID		 3673 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3674 schedule_work(&con_driver_unregister_work);
3675
d9c660e7 3676 return 0;
3e795de7
AD		 3677 }
3678 }
d9c660e7
DV		 3679
3680 return -ENODEV;
3e795de7 3681}
e93a9a86 3682EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 3683
d364b5c3
ID		 3684static void con_driver_unregister_callback(struct work_struct *ignored)
3685{
3686 int i;
3687
3688 console_lock();
3689
3690 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3691 struct con_driver *con_driver = &registered_con_driver[i];
3692
3693 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3694 continue;
3695
3696 console_unlock();
3697
3698 vtconsole_deinit_device(con_driver);
3699 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3700
3701 console_lock();
3702
3703 if (WARN_ON_ONCE(con_driver->con))
3704 con_driver->con = NULL;
3705 con_driver->desc = NULL;
3706 con_driver->dev = NULL;
3707 con_driver->node = 0;
3708 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3709 con_driver->flag = 0;
3710 con_driver->first = 0;
3711 con_driver->last = 0;
3712 }
3713
3714 console_unlock();
3715}
3716
3e795de7
AD		 3717/*
3718 * If we support more console drivers, this function is used
3719 * when a driver wants to take over some existing consoles
3720 * and become default driver for newly opened ones.
3721 *
155957f5 3722 * do_take_over_console is basically a register followed by unbind
50e244cc
AC		 3723 */
3724int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3725{
3726 int err;
3727
3728 err = do_register_con_driver(csw, first, last);
3729 /*
3730 * If we get an busy error we still want to bind the console driver
3731 * and return success, as we may have unbound the console driver
3732 * but not unregistered it.
3733 */
3734 if (err == -EBUSY)
3735 err = 0;
3736 if (!err)
3737 do_bind_con_driver(csw, first, last, deflt);
3738
3739 return err;
3740}
3741EXPORT_SYMBOL_GPL(do_take_over_console);
3742
3e795de7
AD		 3743
3744/*
3745 * give_up_console is a wrapper to unregister_con_driver. It will only
3746 * work if driver is fully unbound.
3747 */
3748void give_up_console(const struct consw *csw)
3749{
70125e76
WY		 3750 console_lock();
3751 do_unregister_con_driver(csw);
3752 console_unlock();
3e795de7
AD		 3753}
3754
6db4063c 3755static int __init vtconsole_class_init(void)
3e795de7 3756{
6db4063c 3757 int i;
3e795de7 3758
6db4063c
AD		 3759 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3760 if (IS_ERR(vtconsole_class)) {
3761 printk(KERN_WARNING "Unable to create vt console class; "
3762 "errno = %ld\n", PTR_ERR(vtconsole_class));
3763 vtconsole_class = NULL;
3764 }
3e795de7 3765
6db4063c 3766 /* Add system drivers to sysfs */
3e795de7
AD		 3767 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3768 struct con_driver *con = &registered_con_driver[i];
3769
805952a8 3770 if (con->con && !con->dev) {
1083a7be
TI		 3771 con->dev =
3772 device_create_with_groups(vtconsole_class, NULL,
3773 MKDEV(0, con->node),
3774 con, con_dev_groups,
3775 "vtcon%i", con->node);
6db4063c 3776
805952a8 3777 if (IS_ERR(con->dev)) {
6db4063c 3778 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3779 "device for %s; errno = %ld\n",
3780 con->desc, PTR_ERR(con->dev));
3781 con->dev = NULL;
6db4063c 3782 } else {
805952a8 3783 vtconsole_init_device(con);
6db4063c 3784 }
3e795de7 3785 }
3e795de7
AD		 3786 }
3787
3e795de7
AD		 3788 return 0;
3789}
6db4063c 3790postcore_initcall(vtconsole_class_init);
3e795de7 3791
1da177e4
LT		 3792#endif
3793
3794/*
3795 * Screen blanking
3796 */
3797
403aac96 3798static int set_vesa_blanking(char __user *p)
1da177e4 3799{
403aac96
YY		 3800 unsigned int mode;
3801
3802 if (get_user(mode, p + 1))
3803 return -EFAULT;
3804
3805 vesa_blank_mode = (mode < 4) ? mode : 0;
3806 return 0;
1da177e4
LT		 3807}
3808
1da177e4
LT		 3809void do_blank_screen(int entering_gfx)
3810{
3811 struct vc_data *vc = vc_cons[fg_console].d;
3812 int i;
3813
3814 WARN_CONSOLE_UNLOCKED();
3815
3816 if (console_blanked) {
3817 if (blank_state == blank_vesa_wait) {
3818 blank_state = blank_off;
d060a321 3819 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3820 }
3821 return;
3822 }
1da177e4
LT		 3823
3824 /* entering graphics mode? */
3825 if (entering_gfx) {
3826 hide_cursor(vc);
3827 save_screen(vc);
3828 vc->vc_sw->con_blank(vc, -1, 1);
3829 console_blanked = fg_console + 1;
b6e8f00f 3830 blank_state = blank_off;
1da177e4
LT		 3831 set_origin(vc);
3832 return;
3833 }
3834
b6e8f00f 3835 if (blank_state != blank_normal_wait)
3836 return;
3837 blank_state = blank_off;
3838
1da177e4
LT		 3839 /* don't blank graphics */
3840 if (vc->vc_mode != KD_TEXT) {
3841 console_blanked = fg_console + 1;
3842 return;
3843 }
3844
3845 hide_cursor(vc);
3846 del_timer_sync(&console_timer);
3847 blank_timer_expired = 0;
3848
3849 save_screen(vc);
3850 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3851 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3852 console_blanked = fg_console + 1;
3853 if (i)
3854 set_origin(vc);
3855
3856 if (console_blank_hook && console_blank_hook(1))
3857 return;
3858
d060a321 3859 if (vesa_off_interval && vesa_blank_mode) {
030babac 3860 blank_state = blank_vesa_wait;
1da177e4
LT		 3861 mod_timer(&console_timer, jiffies + vesa_off_interval);
3862 }
8b92e87d 3863 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3864}
3865EXPORT_SYMBOL(do_blank_screen);
3866
3867/*
3868 * Called by timer as well as from vt_console_driver
3869 */
3870void do_unblank_screen(int leaving_gfx)
3871{
3872 struct vc_data *vc;
3873
3874 /* This should now always be called from a "sane" (read: can schedule)
3875 * context for the sake of the low level drivers, except in the special
3876 * case of oops_in_progress
3877 */
3878 if (!oops_in_progress)
3879 might_sleep();
3880
3881 WARN_CONSOLE_UNLOCKED();
3882
3883 ignore_poke = 0;
3884 if (!console_blanked)
3885 return;
3886 if (!vc_cons_allocated(fg_console)) {
3887 /* impossible */
e620e548
JP		 3888 pr_warn("unblank_screen: tty %d not allocated ??\n",
3889 fg_console + 1);
1da177e4
LT		 3890 return;
3891 }
3892 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3893 /* Try to unblank in oops case too */
3894 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3895 return; /* but leave console_blanked != 0 */
3896
3897 if (blankinterval) {
f324edc8 3898 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3899 blank_state = blank_normal_wait;
3900 }
3901
3902 console_blanked = 0;
8fd4bd22 3903 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3904 /* Low-level driver cannot restore -> do it ourselves */
3905 update_screen(vc);
3906 if (console_blank_hook)
3907 console_blank_hook(0);
3908 set_palette(vc);
3909 set_cursor(vc);
8b92e87d 3910 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3911}
3912EXPORT_SYMBOL(do_unblank_screen);
3913
3914/*
3915 * This is called by the outside world to cause a forced unblank, mostly for
3916 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3917 * call it with 1 as an argument and so force a mode restore... that may kill
3918 * X or at least garbage the screen but would also make the Oops visible...
3919 */
3920void unblank_screen(void)
3921{
3922 do_unblank_screen(0);
3923}
3924
3925/*
70522e12 3926 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3927 * (console operations can still happen at irq time, but only from printk which
70522e12 3928 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3929 */
3930static void blank_screen_t(unsigned long dummy)
3931{
cc63b1e1 3932 if (unlikely(!keventd_up())) {
f324edc8 3933 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3934 return;
3935 }
1da177e4
LT		 3936 blank_timer_expired = 1;
3937 schedule_work(&console_work);
3938}
3939
3940void poke_blanked_console(void)
3941{
3942 WARN_CONSOLE_UNLOCKED();
3943
3944 /* Add this so we quickly catch whoever might call us in a non
3945 * safe context. Nowadays, unblank_screen() isn't to be called in
3946 * atomic contexts and is allowed to schedule (with the special case
3947 * of oops_in_progress, but that isn't of any concern for this
3948 * function. --BenH.
3949 */
3950 might_sleep();
3951
3952 /* This isn't perfectly race free, but a race here would be mostly harmless,
3953 * at worse, we'll do a spurrious blank and it's unlikely
3954 */
3955 del_timer(&console_timer);
3956 blank_timer_expired = 0;
3957
3958 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3959 return;
3960 if (console_blanked)
3961 unblank_screen();
3962 else if (blankinterval) {
f324edc8 3963 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3964 blank_state = blank_normal_wait;
3965 }
3966}
3967
3968/*
3969 * Palettes
3970 */
3971
3972static void set_palette(struct vc_data *vc)
3973{
3974 WARN_CONSOLE_UNLOCKED();
3975
709280da 3976 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
1da177e4
LT		 3977 vc->vc_sw->con_set_palette(vc, color_table);
3978}
3979
1da177e4
LT		 3980/*
3981 * Load palette into the DAC registers. arg points to a colour
3982 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3983 */
3984
3985int con_set_cmap(unsigned char __user *arg)
3986{
871bdea6
MG		 3987 int i, j, k;
3988 unsigned char colormap[3*16];
3989
3990 if (copy_from_user(colormap, arg, sizeof(colormap)))
3991 return -EFAULT;
1da177e4 3992
ac751efa 3993 console_lock();
871bdea6
MG		 3994 for (i = k = 0; i < 16; i++) {
3995 default_red[i] = colormap[k++];
3996 default_grn[i] = colormap[k++];
3997 default_blu[i] = colormap[k++];
3998 }
3999 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4000 if (!vc_cons_allocated(i))
4001 continue;
4002 for (j = k = 0; j < 16; j++) {
4003 vc_cons[i].d->vc_palette[k++] = default_red[j];
4004 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4005 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4006 }
4007 set_palette(vc_cons[i].d);
4008 }
ac751efa 4009 console_unlock();
1da177e4 4010
871bdea6 4011 return 0;
1da177e4
LT		 4012}
4013
4014int con_get_cmap(unsigned char __user *arg)
4015{
871bdea6
MG		 4016 int i, k;
4017 unsigned char colormap[3*16];
1da177e4 4018
ac751efa 4019 console_lock();
871bdea6
MG		 4020 for (i = k = 0; i < 16; i++) {
4021 colormap[k++] = default_red[i];
4022 colormap[k++] = default_grn[i];
4023 colormap[k++] = default_blu[i];
4024 }
ac751efa 4025 console_unlock();
1da177e4 4026
871bdea6
MG		 4027 if (copy_to_user(arg, colormap, sizeof(colormap)))
4028 return -EFAULT;
4029
4030 return 0;
1da177e4
LT		 4031}
4032
4033void reset_palette(struct vc_data *vc)
4034{
4035 int j, k;
4036 for (j=k=0; j<16; j++) {
4037 vc->vc_palette[k++] = default_red[j];
4038 vc->vc_palette[k++] = default_grn[j];
4039 vc->vc_palette[k++] = default_blu[j];
4040 }
4041 set_palette(vc);
4042}
4043
4044/*
4045 * Font switching
4046 *
4047 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4048 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4049 * depending on width) reserved for each character which is kinda wasty, but
4050 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4051 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4052 * format (maybe we should add a `fontoffset' field to the `display'
4053 * structure so we won't have to convert the fontdata all the time.
4054 * /Jes
4055 */
4056
4057#define max_font_size 65536
4058
4059static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4060{
4061 struct console_font font;
4062 int rc = -EINVAL;
4063 int c;
4064
1da177e4
LT		 4065 if (op->data) {
4066 font.data = kmalloc(max_font_size, GFP_KERNEL);
4067 if (!font.data)
4068 return -ENOMEM;
4069 } else
4070 font.data = NULL;
4071
ac751efa 4072 console_lock();
edab558f
AC		 4073 if (vc->vc_mode != KD_TEXT)
4074 rc = -EINVAL;
4075 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4076 rc = vc->vc_sw->con_font_get(vc, &font);
4077 else
4078 rc = -ENOSYS;
ac751efa 4079 console_unlock();
1da177e4
LT		 4080
4081 if (rc)
4082 goto out;
4083
4084 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4085
1da177e4
LT		 4086 if (op->data && font.charcount > op->charcount)
4087 rc = -ENOSPC;
4088 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4089 if (font.width > op->width || font.height > op->height)
4090 rc = -ENOSPC;
4091 } else {
4092 if (font.width != 8)
4093 rc = -EIO;
4094 else if ((op->height && font.height > op->height) ||
4095 font.height > 32)
4096 rc = -ENOSPC;
4097 }
4098 if (rc)
4099 goto out;
4100
4101 op->height = font.height;
4102 op->width = font.width;
4103 op->charcount = font.charcount;
4104
4105 if (op->data && copy_to_user(op->data, font.data, c))
4106 rc = -EFAULT;
4107
4108out:
4109 kfree(font.data);
4110 return rc;
4111}
4112
4113static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4114{
4115 struct console_font font;
4116 int rc = -EINVAL;
4117 int size;
4118
4119 if (vc->vc_mode != KD_TEXT)
4120 return -EINVAL;
4121 if (!op->data)
4122 return -EINVAL;
4123 if (op->charcount > 512)
4124 return -EINVAL;
4125 if (!op->height) { /* Need to guess font height [compat] */
4126 int h, i;
4127 u8 __user *charmap = op->data;
4128 u8 tmp;
4129
4130 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4131 so that we can get rid of this soon */
4132 if (!(op->flags & KD_FONT_FLAG_OLD))
4133 return -EINVAL;
4134 for (h = 32; h > 0; h--)
4135 for (i = 0; i < op->charcount; i++) {
4136 if (get_user(tmp, &charmap[32*i+h-1]))
4137 return -EFAULT;
4138 if (tmp)
4139 goto nonzero;
4140 }
4141 return -EINVAL;
4142 nonzero:
4143 op->height = h;
4144 }
4145 if (op->width <= 0 || op->width > 32 || op->height > 32)
4146 return -EINVAL;
4147 size = (op->width+7)/8 * 32 * op->charcount;
4148 if (size > max_font_size)
4149 return -ENOSPC;
4150 font.charcount = op->charcount;
4151 font.height = op->height;
4152 font.width = op->width;
9b71ca20
JL		 4153 font.data = memdup_user(op->data, size);
4154 if (IS_ERR(font.data))
4155 return PTR_ERR(font.data);
ac751efa 4156 console_lock();
edab558f
AC		 4157 if (vc->vc_mode != KD_TEXT)
4158 rc = -EINVAL;
4159 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4160 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4161 else
4162 rc = -ENOSYS;
ac751efa 4163 console_unlock();
1da177e4
LT		 4164 kfree(font.data);
4165 return rc;
4166}
4167
4168static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4169{
4170 struct console_font font = {.width = op->width, .height = op->height};
4171 char name[MAX_FONT_NAME];
4172 char *s = name;
4173 int rc;
4174
1da177e4
LT		 4175
4176 if (!op->data)
4177 s = NULL;
4178 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4179 return -EFAULT;
4180 else
4181 name[MAX_FONT_NAME - 1] = 0;
4182
ac751efa 4183 console_lock();
edab558f
AC		 4184 if (vc->vc_mode != KD_TEXT) {
4185 console_unlock();
4186 return -EINVAL;
4187 }
1da177e4
LT		 4188 if (vc->vc_sw->con_font_default)
4189 rc = vc->vc_sw->con_font_default(vc, &font, s);
4190 else
4191 rc = -ENOSYS;
ac751efa 4192 console_unlock();
1da177e4
LT		 4193 if (!rc) {
4194 op->width = font.width;
4195 op->height = font.height;
4196 }
4197 return rc;
4198}
4199
4200static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4201{
4202 int con = op->height;
4203 int rc;
4204
1da177e4 4205
ac751efa 4206 console_lock();
edab558f
AC		 4207 if (vc->vc_mode != KD_TEXT)
4208 rc = -EINVAL;
4209 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4210 rc = -ENOSYS;
4211 else if (con < 0 || !vc_cons_allocated(con))
4212 rc = -ENOTTY;
4213 else if (con == vc->vc_num) /* nothing to do */
4214 rc = 0;
4215 else
4216 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4217 console_unlock();
1da177e4
LT		 4218 return rc;
4219}
4220
4221int con_font_op(struct vc_data *vc, struct console_font_op *op)
4222{
4223 switch (op->op) {
4224 case KD_FONT_OP_SET:
4225 return con_font_set(vc, op);
4226 case KD_FONT_OP_GET:
4227 return con_font_get(vc, op);
4228 case KD_FONT_OP_SET_DEFAULT:
4229 return con_font_default(vc, op);
4230 case KD_FONT_OP_COPY:
4231 return con_font_copy(vc, op);
4232 }
4233 return -ENOSYS;
4234}
4235
4236/*
4237 * Interface exported to selection and vcs.
4238 */
4239
4240/* used by selection */
4241u16 screen_glyph(struct vc_data *vc, int offset)
4242{
4243 u16 w = scr_readw(screenpos(vc, offset, 1));
4244 u16 c = w & 0xff;
4245
4246 if (w & vc->vc_hi_font_mask)
4247 c |= 0x100;
4248 return c;
4249}
f7511d5f 4250EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4251
4252/* used by vcs - note the word offset */
4253unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4254{
4255 return screenpos(vc, 2 * w_offset, viewed);
4256}
88867e3d 4257EXPORT_SYMBOL_GPL(screen_pos);
1da177e4
LT		 4258
4259void getconsxy(struct vc_data *vc, unsigned char *p)
4260{
4261 p[0] = vc->vc_x;
4262 p[1] = vc->vc_y;
4263}
4264
4265void putconsxy(struct vc_data *vc, unsigned char *p)
4266{
9477e260 4267 hide_cursor(vc);
1da177e4
LT		 4268 gotoxy(vc, p[0], p[1]);
4269 set_cursor(vc);
4270}
4271
4272u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4273{
4274 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4275 return softcursor_original;
4276 return scr_readw(org);
4277}
4278
4279void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4280{
4281 scr_writew(val, org);
4282 if ((unsigned long)org == vc->vc_pos) {
4283 softcursor_original = -1;
4284 add_softcursor(vc);
4285 }
4286}
4287
432c9ed2
NP		 4288void vcs_scr_updated(struct vc_data *vc)
4289{
4290 notify_update(vc);
4291}
4292
1da177e4
LT		 4293/*
4294 * Visible symbols for modules
4295 */
4296
4297EXPORT_SYMBOL(color_table);
4298EXPORT_SYMBOL(default_red);
4299EXPORT_SYMBOL(default_grn);
4300EXPORT_SYMBOL(default_blu);
4301EXPORT_SYMBOL(update_region);
4302EXPORT_SYMBOL(redraw_screen);
4303EXPORT_SYMBOL(vc_resize);
4304EXPORT_SYMBOL(fg_console);
4305EXPORT_SYMBOL(console_blank_hook);
4306EXPORT_SYMBOL(console_blanked);
4307EXPORT_SYMBOL(vc_cons);
f6c06b68 4308EXPORT_SYMBOL(global_cursor_default);
1da177e4 4309#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4310EXPORT_SYMBOL(give_up_console);
4311#endif
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