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printk: reinstate KERN_CONT for printing continuation lines
[linux-2.6-block.git] / drivers / tty / vt / vt.c
CommitLineData
1da177e4 1/*
1da177e4
LT		 2 * Copyright (C) 1991, 1992 Linus Torvalds
3 */
4
5/*
6 * Hopefully this will be a rather complete VT102 implementation.
7 *
8 * Beeping thanks to John T Kohl.
9 *
10 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
11 * Chars, and VT100 enhancements by Peter MacDonald.
12 *
13 * Copy and paste function by Andrew Haylett,
14 * some enhancements by Alessandro Rubini.
15 *
16 * Code to check for different video-cards mostly by Galen Hunt,
17 * <g-hunt@ee.utah.edu>
18 *
19 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
20 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
21 *
22 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
23 * Resizing of consoles, aeb, 940926
24 *
25 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
26 * <poe@daimi.aau.dk>
27 *
28 * User-defined bell sound, new setterm control sequences and printk
29 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
30 *
31 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
32 *
33 * Merge with the abstract console driver by Geert Uytterhoeven
34 * <geert@linux-m68k.org>, Jan 1997.
35 *
36 * Original m68k console driver modifications by
37 *
38 * - Arno Griffioen <arno@usn.nl>
39 * - David Carter <carter@cs.bris.ac.uk>
40 *
41 * The abstract console driver provides a generic interface for a text
42 * console. It supports VGA text mode, frame buffer based graphical consoles
43 * and special graphics processors that are only accessible through some
44 * registers (e.g. a TMS340x0 GSP).
45 *
46 * The interface to the hardware is specified using a special structure
47 * (struct consw) which contains function pointers to console operations
48 * (see <linux/console.h> for more information).
49 *
50 * Support for changeable cursor shape
51 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
52 *
53 * Ported to i386 and con_scrolldelta fixed
54 * by Emmanuel Marty <core@ggi-project.org>, April 1998
55 *
56 * Resurrected character buffers in videoram plus lots of other trickery
57 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
58 *
59 * Removed old-style timers, introduced console_timer, made timer
e1f8e874 60 * deletion SMP-safe. 17Jun00, Andrew Morton
1da177e4
LT		 61 *
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
d4328b40
AT		 64 *
65 * Fixed UTF-8 mode so alternate charset modes always work according
66 * to control sequences interpreted in do_con_trol function
67 * preserving backward VT100 semigraphics compatibility,
68 * malformed UTF sequences represented as sequences of replacement glyphs,
69 * original codes or '?' as a last resort if replacement glyph is undefined
70 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
1da177e4
LT		 71 */
72
73#include <linux/module.h>
74#include <linux/types.h>
75#include <linux/sched.h>
76#include <linux/tty.h>
77#include <linux/tty_flip.h>
78#include <linux/kernel.h>
79#include <linux/string.h>
80#include <linux/errno.h>
81#include <linux/kd.h>
82#include <linux/slab.h>
83#include <linux/major.h>
84#include <linux/mm.h>
85#include <linux/console.h>
86#include <linux/init.h>
c831c338 87#include <linux/mutex.h>
1da177e4
LT		 88#include <linux/vt_kern.h>
89#include <linux/selection.h>
90#include <linux/tiocl.h>
91#include <linux/kbd_kern.h>
92#include <linux/consolemap.h>
93#include <linux/timer.h>
94#include <linux/interrupt.h>
1da177e4 95#include <linux/workqueue.h>
1da177e4
LT		 96#include <linux/pm.h>
97#include <linux/font.h>
98#include <linux/bitops.h>
b293d758 99#include <linux/notifier.h>
d81ed103
AC		 100#include <linux/device.h>
101#include <linux/io.h>
d81ed103 102#include <linux/uaccess.h>
81d44507 103#include <linux/kdb.h>
74c807ce 104#include <linux/ctype.h>
1da177e4 105
3e795de7 106#define MAX_NR_CON_DRIVER 16
1da177e4 107
6db4063c 108#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 109#define CON_DRIVER_FLAG_INIT 2
110#define CON_DRIVER_FLAG_ATTR 4
d364b5c3 111#define CON_DRIVER_FLAG_ZOMBIE 8
3e795de7
AD		 112
113struct con_driver {
114 const struct consw *con;
115 const char *desc;
805952a8 116 struct device *dev;
6db4063c 117 int node;
3e795de7
AD		 118 int first;
119 int last;
120 int flag;
121};
122
123static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 124const struct consw *conswitchp;
125
126/* A bitmap for codes <32. A bit of 1 indicates that the code
127 * corresponding to that bit number invokes some special action
128 * (such as cursor movement) and should not be displayed as a
129 * glyph unless the disp_ctrl mode is explicitly enabled.
130 */
131#define CTRL_ACTION 0x0d00ff81
132#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
133
134/*
135 * Here is the default bell parameters: 750HZ, 1/8th of a second
136 */
137#define DEFAULT_BELL_PITCH 750
138#define DEFAULT_BELL_DURATION (HZ/8)
bd63364c 139#define DEFAULT_CURSOR_BLINK_MS 200
1da177e4 140
1da177e4
LT		 141struct vc vc_cons [MAX_NR_CONSOLES];
142
143#ifndef VT_SINGLE_DRIVER
144static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145#endif
146
147static int con_open(struct tty_struct *, struct file *);
148static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151static void save_cur(struct vc_data *vc);
152static void reset_terminal(struct vc_data *vc, int do_clear);
153static void con_flush_chars(struct tty_struct *tty);
403aac96 154static int set_vesa_blanking(char __user *p);
1da177e4
LT		 155static void set_cursor(struct vc_data *vc);
156static void hide_cursor(struct vc_data *vc);
65f27f38 157static void console_callback(struct work_struct *ignored);
d364b5c3 158static void con_driver_unregister_callback(struct work_struct *ignored);
1da177e4
LT		 159static void blank_screen_t(unsigned long dummy);
160static void set_palette(struct vc_data *vc);
161
52c40fca
PH		 162#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
163
1da177e4 164static int printable; /* Is console ready for printing? */
77bf2bab 165int default_utf8 = true;
042f10ec 166module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 167int global_cursor_default = -1;
168module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 169
9ea9a886
CL		 170static int cur_default = CUR_DEFAULT;
171module_param(cur_default, int, S_IRUGO | S_IWUSR);
172
1da177e4
LT		 173/*
174 * ignore_poke: don't unblank the screen when things are typed. This is
175 * mainly for the privacy of braille terminal users.
176 */
177static int ignore_poke;
178
179int do_poke_blanked_console;
180int console_blanked;
181
182static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 183static int vesa_off_interval;
f324edc8
DM		 184static int blankinterval = 10*60;
185core_param(consoleblank, blankinterval, int, 0444);
1da177e4 186
65f27f38 187static DECLARE_WORK(console_work, console_callback);
d364b5c3 188static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
1da177e4
LT		 189
190/*
191 * fg_console is the current virtual console,
192 * last_console is the last used one,
193 * want_console is the console we want to switch to,
b45cfba4 194 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 195 */
196int fg_console;
197int last_console;
198int want_console = -1;
fed891c8
JW		 199static int saved_fg_console;
200static int saved_last_console;
201static int saved_want_console;
202static int saved_vc_mode;
beed5336 203static int saved_console_blanked;
1da177e4
LT		 204
205/*
206 * For each existing display, we have a pointer to console currently visible
207 * on that display, allowing consoles other than fg_console to be refreshed
208 * appropriately. Unless the low-level driver supplies its own display_fg
209 * variable, we use this one for the "master display".
210 */
211static struct vc_data *master_display_fg;
212
213/*
214 * Unfortunately, we need to delay tty echo when we're currently writing to the
215 * console since the code is (and always was) not re-entrant, so we schedule
216 * all flip requests to process context with schedule-task() and run it from
217 * console_callback().
218 */
219
220/*
221 * For the same reason, we defer scrollback to the console callback.
222 */
223static int scrollback_delta;
224
225/*
226 * Hook so that the power management routines can (un)blank
227 * the console on our behalf.
228 */
229int (*console_blank_hook)(int);
230
40565f19 231static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
1da177e4
LT		 232static int blank_state;
233static int blank_timer_expired;
234enum {
235 blank_off = 0,
236 blank_normal_wait,
237 blank_vesa_wait,
238};
239
fbc92a34
KS		 240/*
241 * /sys/class/tty/tty0/
242 *
243 * the attribute 'active' contains the name of the current vc
244 * console and it supports poll() to detect vc switches
245 */
246static struct device *tty0dev;
247
b293d758
ST		 248/*
249 * Notifier list for console events.
250 */
251static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
252
253int register_vt_notifier(struct notifier_block *nb)
254{
255 return atomic_notifier_chain_register(&vt_notifier_list, nb);
256}
257EXPORT_SYMBOL_GPL(register_vt_notifier);
258
259int unregister_vt_notifier(struct notifier_block *nb)
260{
261 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
262}
263EXPORT_SYMBOL_GPL(unregister_vt_notifier);
264
265static void notify_write(struct vc_data *vc, unsigned int unicode)
266{
502fcb79 267 struct vt_notifier_param param = { .vc = vc, .c = unicode };
b293d758
ST		 268 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
269}
270
271static void notify_update(struct vc_data *vc)
272{
273 struct vt_notifier_param param = { .vc = vc };
274 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
275}
1da177e4
LT		 276/*
277 * Low-Level Functions
278 */
279
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,
1179 vc->vc_screenbuf_size >> 1);
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
1315 if (vc->vc_par[i] == 5 && i < vc->vc_npar) {
1316 /* 256 colours -- ubiquitous */
1317 i++;
0f91e142 1318 rgb_from_256(vc->vc_par[i], &c);
e05ab238
JS		 1319 } else if (vc->vc_par[i] == 2 && i <= vc->vc_npar + 3) {
1320 /* 24 bit -- extremely rare */
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:
1418 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1419 vc->vc_color = color_table[vc->vc_par[i] - 30]
1420 | (vc->vc_color & 0xf0);
1421 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1422 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1423 | (vc->vc_color & 0x0f);
1424 break;
1da177e4
LT		 1425 }
1426 update_attr(vc);
1427}
1428
6732c8bb 1429static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1430{
1431 while (*p) {
6732c8bb 1432 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1433 p++;
1434 }
6732c8bb 1435 tty_schedule_flip(port);
1da177e4
LT		 1436}
1437
1438static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1439{
1440 char buf[40];
1441
1442 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1443 respond_string(buf, tty->port);
1da177e4
LT		 1444}
1445
1446static inline void status_report(struct tty_struct *tty)
1447{
6732c8bb 1448 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1449}
1450
6732c8bb 1451static inline void respond_ID(struct tty_struct *tty)
1da177e4 1452{
6732c8bb 1453 respond_string(VT102ID, tty->port);
1da177e4
LT		 1454}
1455
1456void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1457{
1458 char buf[8];
1459
1460 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1461 (char)('!' + mry));
6732c8bb 1462 respond_string(buf, tty->port);
1da177e4
LT		 1463}
1464
1465/* invoked via ioctl(TIOCLINUX) and through set_selection */
1466int mouse_reporting(void)
1467{
1468 return vc_cons[fg_console].d->vc_report_mouse;
1469}
1470
ac751efa 1471/* console_lock is held */
1da177e4
LT		 1472static void set_mode(struct vc_data *vc, int on_off)
1473{
1474 int i;
1475
1476 for (i = 0; i <= vc->vc_npar; i++)
1477 if (vc->vc_ques) {
1478 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1479 case 1: /* Cursor keys send ^[Ox/^[[x */
1480 if (on_off)
1481 set_kbd(vc, decckm);
1482 else
1483 clr_kbd(vc, decckm);
1484 break;
1485 case 3: /* 80/132 mode switch unimplemented */
1da177e4
LT		 1486#if 0
1487 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1488 /* this alone does not suffice; some user mode
1489 utility has to change the hardware regs */
1490#endif
1491 break;
1492 case 5: /* Inverted screen on/off */
1493 if (vc->vc_decscnm != on_off) {
1494 vc->vc_decscnm = on_off;
1495 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1496 update_attr(vc);
1497 }
1498 break;
1499 case 6: /* Origin relative/absolute */
1500 vc->vc_decom = on_off;
1501 gotoxay(vc, 0, 0);
1502 break;
1503 case 7: /* Autowrap on/off */
1504 vc->vc_decawm = on_off;
1505 break;
1506 case 8: /* Autorepeat on/off */
1507 if (on_off)
1508 set_kbd(vc, decarm);
1509 else
1510 clr_kbd(vc, decarm);
1511 break;
1512 case 9:
1513 vc->vc_report_mouse = on_off ? 1 : 0;
1514 break;
1515 case 25: /* Cursor on/off */
1516 vc->vc_deccm = on_off;
1517 break;
1518 case 1000:
1519 vc->vc_report_mouse = on_off ? 2 : 0;
1520 break;
1521 }
1522 } else {
1523 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1524 case 3: /* Monitor (display ctrls) */
1525 vc->vc_disp_ctrl = on_off;
1526 break;
1527 case 4: /* Insert Mode on/off */
1528 vc->vc_decim = on_off;
1529 break;
1530 case 20: /* Lf, Enter == CrLf/Lf */
1531 if (on_off)
1532 set_kbd(vc, lnm);
1533 else
1534 clr_kbd(vc, lnm);
1535 break;
1536 }
1537 }
1538}
1539
ac751efa 1540/* console_lock is held */
1da177e4
LT		 1541static void setterm_command(struct vc_data *vc)
1542{
1543 switch(vc->vc_par[0]) {
1544 case 1: /* set color for underline mode */
1545 if (vc->vc_can_do_color &&
1546 vc->vc_par[1] < 16) {
1547 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1548 if (vc->vc_underline)
1549 update_attr(vc);
1550 }
1551 break;
1552 case 2: /* set color for half intensity mode */
1553 if (vc->vc_can_do_color &&
1554 vc->vc_par[1] < 16) {
1555 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1556 if (vc->vc_intensity == 0)
1557 update_attr(vc);
1558 }
1559 break;
1560 case 8: /* store colors as defaults */
1561 vc->vc_def_color = vc->vc_attr;
1562 if (vc->vc_hi_font_mask == 0x100)
1563 vc->vc_def_color >>= 1;
1564 default_attr(vc);
1565 update_attr(vc);
1566 break;
1567 case 9: /* set blanking interval */
f324edc8 1568 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1569 poke_blanked_console();
1570 break;
1571 case 10: /* set bell frequency in Hz */
1572 if (vc->vc_npar >= 1)
1573 vc->vc_bell_pitch = vc->vc_par[1];
1574 else
1575 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1576 break;
1577 case 11: /* set bell duration in msec */
1578 if (vc->vc_npar >= 1)
1579 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
3372ec28 1580 msecs_to_jiffies(vc->vc_par[1]) : 0;
1da177e4
LT		 1581 else
1582 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1583 break;
1584 case 12: /* bring specified console to the front */
1585 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1586 set_console(vc->vc_par[1] - 1);
1587 break;
1588 case 13: /* unblank the screen */
1589 poke_blanked_console();
1590 break;
1591 case 14: /* set vesa powerdown interval */
1592 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1593 break;
1594 case 15: /* activate the previous console */
1595 set_console(last_console);
1596 break;
bd63364c
SD		 1597 case 16: /* set cursor blink duration in msec */
1598 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1599 vc->vc_par[1] <= USHRT_MAX)
1600 vc->vc_cur_blink_ms = vc->vc_par[1];
1601 else
1602 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1603 break;
1da177e4
LT		 1604 }
1605}
1606
ac751efa 1607/* console_lock is held */
1da177e4
LT		 1608static void csi_at(struct vc_data *vc, unsigned int nr)
1609{
1610 if (nr > vc->vc_cols - vc->vc_x)
1611 nr = vc->vc_cols - vc->vc_x;
1612 else if (!nr)
1613 nr = 1;
1614 insert_char(vc, nr);
1615}
1616
ac751efa 1617/* console_lock is held */
1da177e4
LT		 1618static void csi_L(struct vc_data *vc, unsigned int nr)
1619{
1620 if (nr > vc->vc_rows - vc->vc_y)
1621 nr = vc->vc_rows - vc->vc_y;
1622 else if (!nr)
1623 nr = 1;
1624 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1625 vc->vc_need_wrap = 0;
1626}
1627
ac751efa 1628/* console_lock is held */
1da177e4
LT		 1629static void csi_P(struct vc_data *vc, unsigned int nr)
1630{
1631 if (nr > vc->vc_cols - vc->vc_x)
1632 nr = vc->vc_cols - vc->vc_x;
1633 else if (!nr)
1634 nr = 1;
1635 delete_char(vc, nr);
1636}
1637
ac751efa 1638/* console_lock is held */
1da177e4
LT		 1639static void csi_M(struct vc_data *vc, unsigned int nr)
1640{
1641 if (nr > vc->vc_rows - vc->vc_y)
1642 nr = vc->vc_rows - vc->vc_y;
1643 else if (!nr)
1644 nr=1;
1645 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1646 vc->vc_need_wrap = 0;
1647}
1648
ac751efa 1649/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1650static void save_cur(struct vc_data *vc)
1651{
1652 vc->vc_saved_x = vc->vc_x;
1653 vc->vc_saved_y = vc->vc_y;
1654 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1655 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1656 vc->vc_s_underline = vc->vc_underline;
1657 vc->vc_s_blink = vc->vc_blink;
1658 vc->vc_s_reverse = vc->vc_reverse;
1659 vc->vc_s_charset = vc->vc_charset;
1660 vc->vc_s_color = vc->vc_color;
1661 vc->vc_saved_G0 = vc->vc_G0_charset;
1662 vc->vc_saved_G1 = vc->vc_G1_charset;
1663}
1664
ac751efa 1665/* console_lock is held */
1da177e4
LT		 1666static void restore_cur(struct vc_data *vc)
1667{
1668 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1669 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1670 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1671 vc->vc_underline = vc->vc_s_underline;
1672 vc->vc_blink = vc->vc_s_blink;
1673 vc->vc_reverse = vc->vc_s_reverse;
1674 vc->vc_charset = vc->vc_s_charset;
1675 vc->vc_color = vc->vc_s_color;
1676 vc->vc_G0_charset = vc->vc_saved_G0;
1677 vc->vc_G1_charset = vc->vc_saved_G1;
1678 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1679 update_attr(vc);
1680 vc->vc_need_wrap = 0;
1681}
1682
b290af68 1683enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1da177e4 1684 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
63f3a16d 1685 ESpalette, ESosc };
1da177e4 1686
ac751efa 1687/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1688static void reset_terminal(struct vc_data *vc, int do_clear)
1689{
1690 vc->vc_top = 0;
1691 vc->vc_bottom = vc->vc_rows;
1692 vc->vc_state = ESnormal;
1693 vc->vc_ques = 0;
1694 vc->vc_translate = set_translate(LAT1_MAP, vc);
1695 vc->vc_G0_charset = LAT1_MAP;
1696 vc->vc_G1_charset = GRAF_MAP;
1697 vc->vc_charset = 0;
1698 vc->vc_need_wrap = 0;
1699 vc->vc_report_mouse = 0;
042f10ec 1700 vc->vc_utf = default_utf8;
1da177e4
LT		 1701 vc->vc_utf_count = 0;
1702
1703 vc->vc_disp_ctrl = 0;
1704 vc->vc_toggle_meta = 0;
1705
1706 vc->vc_decscnm = 0;
1707 vc->vc_decom = 0;
1708 vc->vc_decawm = 1;
f6c06b68 1709 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1710 vc->vc_decim = 0;
1711
079c9534 1712 vt_reset_keyboard(vc->vc_num);
1da177e4 1713
9ea9a886 1714 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1715 vc->vc_complement_mask = vc->vc_s_complement_mask;
1716
1717 default_attr(vc);
1718 update_attr(vc);
1719
1720 vc->vc_tab_stop[0] = 0x01010100;
1721 vc->vc_tab_stop[1] =
1722 vc->vc_tab_stop[2] =
1723 vc->vc_tab_stop[3] =
a564738c
WK		 1724 vc->vc_tab_stop[4] =
1725 vc->vc_tab_stop[5] =
1726 vc->vc_tab_stop[6] =
1727 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1728
1729 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1730 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 1731 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1732
1733 gotoxy(vc, 0, 0);
1734 save_cur(vc);
1735 if (do_clear)
1736 csi_J(vc, 2);
1737}
1738
ac751efa 1739/* console_lock is held */
1da177e4
LT		 1740static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1741{
1742 /*
1743 * Control characters can be used in the _middle_
1744 * of an escape sequence.
1745 */
63f3a16d
AB		 1746 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1747 return;
1da177e4
LT		 1748 switch (c) {
1749 case 0:
1750 return;
1751 case 7:
63f3a16d
AB		 1752 if (vc->vc_state == ESosc)
1753 vc->vc_state = ESnormal;
1754 else if (vc->vc_bell_duration)
1da177e4
LT		 1755 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1756 return;
1757 case 8:
1758 bs(vc);
1759 return;
1760 case 9:
1761 vc->vc_pos -= (vc->vc_x << 1);
1762 while (vc->vc_x < vc->vc_cols - 1) {
1763 vc->vc_x++;
1764 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1765 break;
1766 }
1767 vc->vc_pos += (vc->vc_x << 1);
b293d758 1768 notify_write(vc, '\t');
1da177e4
LT		 1769 return;
1770 case 10: case 11: case 12:
1771 lf(vc);
1772 if (!is_kbd(vc, lnm))
1773 return;
1774 case 13:
1775 cr(vc);
1776 return;
1777 case 14:
1778 vc->vc_charset = 1;
1779 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1780 vc->vc_disp_ctrl = 1;
1781 return;
1782 case 15:
1783 vc->vc_charset = 0;
1784 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1785 vc->vc_disp_ctrl = 0;
1786 return;
1787 case 24: case 26:
1788 vc->vc_state = ESnormal;
1789 return;
1790 case 27:
1791 vc->vc_state = ESesc;
1792 return;
1793 case 127:
1794 del(vc);
1795 return;
1796 case 128+27:
1797 vc->vc_state = ESsquare;
1798 return;
1799 }
1800 switch(vc->vc_state) {
1801 case ESesc:
1802 vc->vc_state = ESnormal;
1803 switch (c) {
1804 case '[':
1805 vc->vc_state = ESsquare;
1806 return;
1807 case ']':
1808 vc->vc_state = ESnonstd;
1809 return;
1810 case '%':
1811 vc->vc_state = ESpercent;
1812 return;
1813 case 'E':
1814 cr(vc);
1815 lf(vc);
1816 return;
1817 case 'M':
1818 ri(vc);
1819 return;
1820 case 'D':
1821 lf(vc);
1822 return;
1823 case 'H':
1824 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1825 return;
1826 case 'Z':
1827 respond_ID(tty);
1828 return;
1829 case '7':
1830 save_cur(vc);
1831 return;
1832 case '8':
1833 restore_cur(vc);
1834 return;
1835 case '(':
1836 vc->vc_state = ESsetG0;
1837 return;
1838 case ')':
1839 vc->vc_state = ESsetG1;
1840 return;
1841 case '#':
1842 vc->vc_state = EShash;
1843 return;
1844 case 'c':
1845 reset_terminal(vc, 1);
1846 return;
1847 case '>': /* Numeric keypad */
1848 clr_kbd(vc, kbdapplic);
1849 return;
1850 case '=': /* Appl. keypad */
1851 set_kbd(vc, kbdapplic);
1852 return;
1853 }
1854 return;
1855 case ESnonstd:
1856 if (c=='P') { /* palette escape sequence */
1857 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1858 vc->vc_par[vc->vc_npar] = 0;
1859 vc->vc_npar = 0;
1860 vc->vc_state = ESpalette;
1861 return;
1862 } else if (c=='R') { /* reset palette */
1863 reset_palette(vc);
1864 vc->vc_state = ESnormal;
63f3a16d
AB		 1865 } else if (c>='0' && c<='9')
1866 vc->vc_state = ESosc;
1867 else
1da177e4
LT		 1868 vc->vc_state = ESnormal;
1869 return;
1870 case ESpalette:
74c807ce
AS		 1871 if (isxdigit(c)) {
1872 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1873 if (vc->vc_npar == 7) {
1874 int i = vc->vc_par[0] * 3, j = 1;
1875 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1876 vc->vc_palette[i++] += vc->vc_par[j++];
1877 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1878 vc->vc_palette[i++] += vc->vc_par[j++];
1879 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1880 vc->vc_palette[i] += vc->vc_par[j];
1881 set_palette(vc);
1882 vc->vc_state = ESnormal;
1883 }
1884 } else
1885 vc->vc_state = ESnormal;
1886 return;
1887 case ESsquare:
1888 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1889 vc->vc_par[vc->vc_npar] = 0;
1890 vc->vc_npar = 0;
1891 vc->vc_state = ESgetpars;
1892 if (c == '[') { /* Function key */
1893 vc->vc_state=ESfunckey;
1894 return;
1895 }
1896 vc->vc_ques = (c == '?');
1897 if (vc->vc_ques)
1898 return;
1899 case ESgetpars:
1900 if (c == ';' && vc->vc_npar < NPAR - 1) {
1901 vc->vc_npar++;
1902 return;
1903 } else if (c>='0' && c<='9') {
1904 vc->vc_par[vc->vc_npar] *= 10;
1905 vc->vc_par[vc->vc_npar] += c - '0';
1906 return;
b290af68 1907 }
1da177e4
LT		 1908 vc->vc_state = ESnormal;
1909 switch(c) {
1910 case 'h':
1911 set_mode(vc, 1);
1912 return;
1913 case 'l':
1914 set_mode(vc, 0);
1915 return;
1916 case 'c':
1917 if (vc->vc_ques) {
1918 if (vc->vc_par[0])
1919 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1920 else
9ea9a886 1921 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1922 return;
1923 }
1924 break;
1925 case 'm':
1926 if (vc->vc_ques) {
1927 clear_selection();
1928 if (vc->vc_par[0])
1929 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1930 else
1931 vc->vc_complement_mask = vc->vc_s_complement_mask;
1932 return;
1933 }
1934 break;
1935 case 'n':
1936 if (!vc->vc_ques) {
1937 if (vc->vc_par[0] == 5)
1938 status_report(tty);
1939 else if (vc->vc_par[0] == 6)
1940 cursor_report(vc, tty);
1941 }
1942 return;
1943 }
1944 if (vc->vc_ques) {
1945 vc->vc_ques = 0;
1946 return;
1947 }
1948 switch(c) {
1949 case 'G': case '`':
1950 if (vc->vc_par[0])
1951 vc->vc_par[0]--;
1952 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1953 return;
1954 case 'A':
1955 if (!vc->vc_par[0])
1956 vc->vc_par[0]++;
1957 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1958 return;
1959 case 'B': case 'e':
1960 if (!vc->vc_par[0])
1961 vc->vc_par[0]++;
1962 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1963 return;
1964 case 'C': case 'a':
1965 if (!vc->vc_par[0])
1966 vc->vc_par[0]++;
1967 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1968 return;
1969 case 'D':
1970 if (!vc->vc_par[0])
1971 vc->vc_par[0]++;
1972 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1973 return;
1974 case 'E':
1975 if (!vc->vc_par[0])
1976 vc->vc_par[0]++;
1977 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1978 return;
1979 case 'F':
1980 if (!vc->vc_par[0])
1981 vc->vc_par[0]++;
1982 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1983 return;
1984 case 'd':
1985 if (vc->vc_par[0])
1986 vc->vc_par[0]--;
1987 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1988 return;
1989 case 'H': case 'f':
1990 if (vc->vc_par[0])
1991 vc->vc_par[0]--;
1992 if (vc->vc_par[1])
1993 vc->vc_par[1]--;
1994 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1995 return;
1996 case 'J':
1997 csi_J(vc, vc->vc_par[0]);
1998 return;
1999 case 'K':
2000 csi_K(vc, vc->vc_par[0]);
2001 return;
2002 case 'L':
2003 csi_L(vc, vc->vc_par[0]);
2004 return;
2005 case 'M':
2006 csi_M(vc, vc->vc_par[0]);
2007 return;
2008 case 'P':
2009 csi_P(vc, vc->vc_par[0]);
2010 return;
2011 case 'c':
2012 if (!vc->vc_par[0])
2013 respond_ID(tty);
2014 return;
2015 case 'g':
2016 if (!vc->vc_par[0])
2017 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2018 else if (vc->vc_par[0] == 3) {
2019 vc->vc_tab_stop[0] =
2020 vc->vc_tab_stop[1] =
2021 vc->vc_tab_stop[2] =
2022 vc->vc_tab_stop[3] =
a564738c
WK		 2023 vc->vc_tab_stop[4] =
2024 vc->vc_tab_stop[5] =
2025 vc->vc_tab_stop[6] =
2026 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 2027 }
2028 return;
2029 case 'm':
2030 csi_m(vc);
2031 return;
2032 case 'q': /* DECLL - but only 3 leds */
2033 /* map 0,1,2,3 to 0,1,2,4 */
2034 if (vc->vc_par[0] < 4)
079c9534 2035 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2036 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2037 return;
2038 case 'r':
2039 if (!vc->vc_par[0])
2040 vc->vc_par[0]++;
2041 if (!vc->vc_par[1])
2042 vc->vc_par[1] = vc->vc_rows;
2043 /* Minimum allowed region is 2 lines */
2044 if (vc->vc_par[0] < vc->vc_par[1] &&
2045 vc->vc_par[1] <= vc->vc_rows) {
2046 vc->vc_top = vc->vc_par[0] - 1;
2047 vc->vc_bottom = vc->vc_par[1];
2048 gotoxay(vc, 0, 0);
2049 }
2050 return;
2051 case 's':
2052 save_cur(vc);
2053 return;
2054 case 'u':
2055 restore_cur(vc);
2056 return;
2057 case 'X':
2058 csi_X(vc, vc->vc_par[0]);
2059 return;
2060 case '@':
2061 csi_at(vc, vc->vc_par[0]);
2062 return;
2063 case ']': /* setterm functions */
2064 setterm_command(vc);
2065 return;
2066 }
2067 return;
2068 case ESpercent:
2069 vc->vc_state = ESnormal;
2070 switch (c) {
2071 case '@': /* defined in ISO 2022 */
2072 vc->vc_utf = 0;
2073 return;
2074 case 'G': /* prelim official escape code */
2075 case '8': /* retained for compatibility */
2076 vc->vc_utf = 1;
2077 return;
2078 }
2079 return;
2080 case ESfunckey:
2081 vc->vc_state = ESnormal;
2082 return;
2083 case EShash:
2084 vc->vc_state = ESnormal;
2085 if (c == '8') {
2086 /* DEC screen alignment test. kludge :-) */
2087 vc->vc_video_erase_char =
2088 (vc->vc_video_erase_char & 0xff00) | 'E';
2089 csi_J(vc, 2);
2090 vc->vc_video_erase_char =
2091 (vc->vc_video_erase_char & 0xff00) | ' ';
2092 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2093 }
2094 return;
2095 case ESsetG0:
2096 if (c == '0')
2097 vc->vc_G0_charset = GRAF_MAP;
2098 else if (c == 'B')
2099 vc->vc_G0_charset = LAT1_MAP;
2100 else if (c == 'U')
2101 vc->vc_G0_charset = IBMPC_MAP;
2102 else if (c == 'K')
2103 vc->vc_G0_charset = USER_MAP;
2104 if (vc->vc_charset == 0)
2105 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2106 vc->vc_state = ESnormal;
2107 return;
2108 case ESsetG1:
2109 if (c == '0')
2110 vc->vc_G1_charset = GRAF_MAP;
2111 else if (c == 'B')
2112 vc->vc_G1_charset = LAT1_MAP;
2113 else if (c == 'U')
2114 vc->vc_G1_charset = IBMPC_MAP;
2115 else if (c == 'K')
2116 vc->vc_G1_charset = USER_MAP;
2117 if (vc->vc_charset == 1)
2118 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2119 vc->vc_state = ESnormal;
2120 return;
63f3a16d
AB		 2121 case ESosc:
2122 return;
1da177e4
LT		 2123 default:
2124 vc->vc_state = ESnormal;
2125 }
2126}
2127
2f1a2ccb 2128/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2129 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2130 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2131 */
2132struct interval {
2133 uint32_t first;
2134 uint32_t last;
2135};
2136
2137static int bisearch(uint32_t ucs, const struct interval *table, int max)
2138{
2139 int min = 0;
2140 int mid;
2141
2142 if (ucs < table[0].first || ucs > table[max].last)
2143 return 0;
2144 while (max >= min) {
2145 mid = (min + max) / 2;
2146 if (ucs > table[mid].last)
2147 min = mid + 1;
2148 else if (ucs < table[mid].first)
2149 max = mid - 1;
2150 else
2151 return 1;
2152 }
2153 return 0;
2154}
2155
2156static int is_double_width(uint32_t ucs)
2157{
2158 static const struct interval double_width[] = {
2159 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2160 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2161 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2162 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2163 };
0f11541b 2164 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2165}
2166
d711ea8f
JS		 2167static void con_flush(struct vc_data *vc, unsigned long draw_from,
2168 unsigned long draw_to, int *draw_x)
2169{
2170 if (*draw_x < 0)
2171 return;
2172
2173 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2174 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2175 *draw_x = -1;
2176}
2177
ac751efa 2178/* acquires console_lock */
1da177e4
LT		 2179static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2180{
1da177e4
LT		 2181 int c, tc, ok, n = 0, draw_x = -1;
2182 unsigned int currcons;
2183 unsigned long draw_from = 0, draw_to = 0;
2184 struct vc_data *vc;
2f1a2ccb 2185 unsigned char vc_attr;
0341a4d0 2186 struct vt_notifier_param param;
2f1a2ccb
EK		 2187 uint8_t rescan;
2188 uint8_t inverse;
2189 uint8_t width;
1da177e4 2190 u16 himask, charmask;
1da177e4
LT		 2191
2192 if (in_interrupt())
2193 return count;
2194
2195 might_sleep();
2196
ac751efa 2197 console_lock();
1da177e4
LT		 2198 vc = tty->driver_data;
2199 if (vc == NULL) {
2200 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2201 console_unlock();
1da177e4
LT		 2202 return 0;
2203 }
2204
2205 currcons = vc->vc_num;
2206 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2207 /* could this happen? */
2208 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2209 console_unlock();
2210 return 0;
1da177e4 2211 }
1da177e4 2212
1da177e4
LT		 2213 himask = vc->vc_hi_font_mask;
2214 charmask = himask ? 0x1ff : 0xff;
2215
2216 /* undraw cursor first */
6ca8dfd7 2217 if (con_is_fg(vc))
1da177e4
LT		 2218 hide_cursor(vc);
2219
0341a4d0
KD		 2220 param.vc = vc;
2221
1da177e4
LT		 2222 while (!tty->stopped && count) {
2223 int orig = *buf;
2224 c = orig;
2225 buf++;
2226 n++;
2227 count--;
2f1a2ccb
EK		 2228 rescan = 0;
2229 inverse = 0;
2230 width = 1;
1da177e4
LT		 2231
2232 /* Do no translation at all in control states */
2233 if (vc->vc_state != ESnormal) {
2234 tc = c;
d4328b40 2235 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2236 /* Combine UTF-8 into Unicode in vc_utf_char.
2237 * vc_utf_count is the number of continuation bytes still
2238 * expected to arrive.
2239 * vc_npar is the number of continuation bytes arrived so
2240 * far
2241 */
d4328b40 2242rescan_last_byte:
2f1a2ccb
EK		 2243 if ((c & 0xc0) == 0x80) {
2244 /* Continuation byte received */
2245 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2246 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2247 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2248 vc->vc_npar++;
2249 if (--vc->vc_utf_count) {
2250 /* Still need some bytes */
1da177e4 2251 continue;
2f1a2ccb
EK		 2252 }
2253 /* Got a whole character */
2254 c = vc->vc_utf_char;
2255 /* Reject overlong sequences */
2256 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2257 c > utf8_length_changes[vc->vc_npar])
2258 c = 0xfffd;
2259 } else {
2260 /* Unexpected continuation byte */
2261 vc->vc_utf_count = 0;
2262 c = 0xfffd;
2263 }
1da177e4 2264 } else {
2f1a2ccb
EK		 2265 /* Single ASCII byte or first byte of a sequence received */
2266 if (vc->vc_utf_count) {
2267 /* Continuation byte expected */
2268 rescan = 1;
2269 vc->vc_utf_count = 0;
2270 c = 0xfffd;
2271 } else if (c > 0x7f) {
2272 /* First byte of a multibyte sequence received */
2273 vc->vc_npar = 0;
2274 if ((c & 0xe0) == 0xc0) {
2275 vc->vc_utf_count = 1;
2276 vc->vc_utf_char = (c & 0x1f);
2277 } else if ((c & 0xf0) == 0xe0) {
2278 vc->vc_utf_count = 2;
2279 vc->vc_utf_char = (c & 0x0f);
2280 } else if ((c & 0xf8) == 0xf0) {
2281 vc->vc_utf_count = 3;
2282 vc->vc_utf_char = (c & 0x07);
2283 } else if ((c & 0xfc) == 0xf8) {
2284 vc->vc_utf_count = 4;
2285 vc->vc_utf_char = (c & 0x03);
2286 } else if ((c & 0xfe) == 0xfc) {
2287 vc->vc_utf_count = 5;
2288 vc->vc_utf_char = (c & 0x01);
2289 } else {
2290 /* 254 and 255 are invalid */
2291 c = 0xfffd;
2292 }
2293 if (vc->vc_utf_count) {
2294 /* Still need some bytes */
2295 continue;
2296 }
2297 }
2298 /* Nothing to do if an ASCII byte was received */
1da177e4 2299 }
2f1a2ccb
EK		 2300 /* End of UTF-8 decoding. */
2301 /* c is the received character, or U+FFFD for invalid sequences. */
2302 /* Replace invalid Unicode code points with U+FFFD too */
2303 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2304 c = 0xfffd;
2305 tc = c;
d4328b40 2306 } else { /* no utf or alternate charset mode */
a29ccf6f 2307 tc = vc_translate(vc, c);
1da177e4
LT		 2308 }
2309
0341a4d0
KD		 2310 param.c = tc;
2311 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2312 &param) == NOTIFY_STOP)
2313 continue;
2314
1da177e4
LT		 2315 /* If the original code was a control character we
2316 * only allow a glyph to be displayed if the code is
2317 * not normally used (such as for cursor movement) or
2318 * if the disp_ctrl mode has been explicitly enabled.
2319 * Certain characters (as given by the CTRL_ALWAYS
2320 * bitmap) are always displayed as control characters,
2321 * as the console would be pretty useless without
2322 * them; to display an arbitrary font position use the
2323 * direct-to-font zone in UTF-8 mode.
2324 */
2325 ok = tc && (c >= 32 ||
d4328b40
AT		 2326 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2327 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2328 && (c != 127 || vc->vc_disp_ctrl)
2329 && (c != 128+27);
2330
2331 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2332 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2333 if (is_double_width(c))
2334 width = 2;
2335 }
1da177e4
LT		 2336 /* Now try to find out how to display it */
2337 tc = conv_uni_to_pc(vc, tc);
d4328b40 2338 if (tc & ~charmask) {
2f1a2ccb
EK		 2339 if (tc == -1 || tc == -2) {
2340 continue; /* nothing to display */
2341 }
2342 /* Glyph not found */
c0b79882 2343 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2344 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2345 This would make absolutely no sense with Unicode in mind,
2346 but do this for ASCII characters since a font may lack
2347 Unicode mapping info and we don't want to end up with
2348 having question marks only. */
2f1a2ccb
EK		 2349 tc = c;
2350 } else {
2351 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2352 tc = conv_uni_to_pc(vc, 0xfffd);
2353 if (tc < 0) {
2354 inverse = 1;
2355 tc = conv_uni_to_pc(vc, '?');
2356 if (tc < 0) tc = '?';
2357 }
2358 }
d4328b40 2359 }
1da177e4 2360
2f1a2ccb
EK		 2361 if (!inverse) {
2362 vc_attr = vc->vc_attr;
1da177e4 2363 } else {
2f1a2ccb
EK		 2364 /* invert vc_attr */
2365 if (!vc->vc_can_do_color) {
2366 vc_attr = (vc->vc_attr) ^ 0x08;
2367 } else if (vc->vc_hi_font_mask == 0x100) {
2368 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2369 } else {
2370 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2371 }
d711ea8f 2372 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4 2373 }
2f1a2ccb
EK		 2374
2375 while (1) {
2376 if (vc->vc_need_wrap || vc->vc_decim)
d711ea8f
JS		 2377 con_flush(vc, draw_from, draw_to,
2378 &draw_x);
2f1a2ccb
EK		 2379 if (vc->vc_need_wrap) {
2380 cr(vc);
2381 lf(vc);
2382 }
2383 if (vc->vc_decim)
2384 insert_char(vc, 1);
2385 scr_writew(himask ?
2386 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2387 (vc_attr << 8) + tc,
2388 (u16 *) vc->vc_pos);
6ca8dfd7 2389 if (con_should_update(vc) && draw_x < 0) {
2f1a2ccb
EK		 2390 draw_x = vc->vc_x;
2391 draw_from = vc->vc_pos;
2392 }
2393 if (vc->vc_x == vc->vc_cols - 1) {
2394 vc->vc_need_wrap = vc->vc_decawm;
2395 draw_to = vc->vc_pos + 2;
2396 } else {
2397 vc->vc_x++;
2398 draw_to = (vc->vc_pos += 2);
d4328b40 2399 }
2f1a2ccb
EK		 2400
2401 if (!--width) break;
2402
2403 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2404 if (tc < 0) tc = ' ';
2405 }
b293d758 2406 notify_write(vc, c);
2f1a2ccb 2407
d711ea8f
JS		 2408 if (inverse)
2409 con_flush(vc, draw_from, draw_to, &draw_x);
1ed8a2b3 2410
2f1a2ccb
EK		 2411 if (rescan) {
2412 rescan = 0;
2413 inverse = 0;
2414 width = 1;
d4328b40
AT		 2415 c = orig;
2416 goto rescan_last_byte;
2417 }
1da177e4
LT		 2418 continue;
2419 }
d711ea8f 2420 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4
LT		 2421 do_con_trol(tty, vc, orig);
2422 }
d711ea8f 2423 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4 2424 console_conditional_schedule();
ac751efa 2425 console_unlock();
b293d758 2426 notify_update(vc);
1da177e4 2427 return n;
1da177e4
LT		 2428}
2429
2430/*
2431 * This is the console switching callback.
2432 *
2433 * Doing console switching in a process context allows
2434 * us to do the switches asynchronously (needed when we want
2435 * to switch due to a keyboard interrupt). Synchronization
2436 * with other console code and prevention of re-entrancy is
ac751efa 2437 * ensured with console_lock.
1da177e4 2438 */
65f27f38 2439static void console_callback(struct work_struct *ignored)
1da177e4 2440{
ac751efa 2441 console_lock();
1da177e4
LT		 2442
2443 if (want_console >= 0) {
2444 if (want_console != fg_console &&
2445 vc_cons_allocated(want_console)) {
2446 hide_cursor(vc_cons[fg_console].d);
2447 change_console(vc_cons[want_console].d);
2448 /* we only changed when the console had already
2449 been allocated - a new console is not created
2450 in an interrupt routine */
2451 }
2452 want_console = -1;
2453 }
2454 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2455 do_poke_blanked_console = 0;
2456 poke_blanked_console();
2457 }
2458 if (scrollback_delta) {
2459 struct vc_data *vc = vc_cons[fg_console].d;
2460 clear_selection();
97293de9 2461 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
1da177e4
LT		 2462 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2463 scrollback_delta = 0;
2464 }
2465 if (blank_timer_expired) {
2466 do_blank_screen(0);
2467 blank_timer_expired = 0;
2468 }
b293d758 2469 notify_update(vc_cons[fg_console].d);
1da177e4 2470
ac751efa 2471 console_unlock();
1da177e4
LT		 2472}
2473
b257bc05 2474int set_console(int nr)
1da177e4 2475{
b257bc05
AJ		 2476 struct vc_data *vc = vc_cons[fg_console].d;
2477
2478 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2479 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2480
2481 /*
2482 * Console switch will fail in console_callback() or
2483 * change_console() so there is no point scheduling
2484 * the callback
2485 *
2486 * Existing set_console() users don't check the return
2487 * value so this shouldn't break anything
2488 */
2489 return -EINVAL;
2490 }
2491
1da177e4
LT		 2492 want_console = nr;
2493 schedule_console_callback();
b257bc05
AJ		 2494
2495 return 0;
1da177e4
LT		 2496}
2497
2498struct tty_driver *console_driver;
2499
2500#ifdef CONFIG_VT_CONSOLE
2501
5ada918b
BW		 2502/**
2503 * vt_kmsg_redirect() - Sets/gets the kernel message console
2504 * @new: The new virtual terminal number or -1 if the console should stay
2505 * unchanged
2506 *
2507 * By default, the kernel messages are always printed on the current virtual
2508 * console. However, the user may modify that default with the
2509 * TIOCL_SETKMSGREDIRECT ioctl call.
2510 *
2511 * This function sets the kernel message console to be @new. It returns the old
2512 * virtual console number. The virtual terminal number 0 (both as parameter and
2513 * return value) means no redirection (i.e. always printed on the currently
2514 * active console).
2515 *
2516 * The parameter -1 means that only the current console is returned, but the
2517 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2518 * case to make the code more understandable.
2519 *
2520 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2521 * the parameter and always returns 0.
2522 */
2523int vt_kmsg_redirect(int new)
2524{
2525 static int kmsg_con;
2526
2527 if (new != -1)
2528 return xchg(&kmsg_con, new);
2529 else
2530 return kmsg_con;
2531}
2532
1da177e4
LT		 2533/*
2534 * Console on virtual terminal
2535 *
2536 * The console must be locked when we get here.
2537 */
2538
2539static void vt_console_print(struct console *co, const char *b, unsigned count)
2540{
2541 struct vc_data *vc = vc_cons[fg_console].d;
2542 unsigned char c;
b0940003 2543 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2544 const ushort *start;
2545 ushort cnt = 0;
2546 ushort myx;
5ada918b 2547 int kmsg_console;
1da177e4
LT		 2548
2549 /* console busy or not yet initialized */
b0940003
NP		 2550 if (!printable)
2551 return;
2552 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2553 return;
2554
5ada918b
BW		 2555 kmsg_console = vt_get_kmsg_redirect();
2556 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2557 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2558
2559 /* read `x' only after setting currcons properly (otherwise
2560 the `x' macro will read the x of the foreground console). */
2561 myx = vc->vc_x;
2562
2563 if (!vc_cons_allocated(fg_console)) {
2564 /* impossible */
2565 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2566 goto quit;
2567 }
2568
8fd4bd22 2569 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2570 goto quit;
2571
2572 /* undraw cursor first */
6ca8dfd7 2573 if (con_is_fg(vc))
1da177e4
LT		 2574 hide_cursor(vc);
2575
2576 start = (ushort *)vc->vc_pos;
2577
2578 /* Contrived structure to try to emulate original need_wrap behaviour
2579 * Problems caused when we have need_wrap set on '\n' character */
2580 while (count--) {
2581 c = *b++;
2582 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2583 if (cnt > 0) {
6ca8dfd7 2584 if (con_is_visible(vc))
1da177e4
LT		 2585 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2586 vc->vc_x += cnt;
2587 if (vc->vc_need_wrap)
2588 vc->vc_x--;
2589 cnt = 0;
2590 }
2591 if (c == 8) { /* backspace */
2592 bs(vc);
2593 start = (ushort *)vc->vc_pos;
2594 myx = vc->vc_x;
2595 continue;
2596 }
2597 if (c != 13)
2598 lf(vc);
2599 cr(vc);
2600 start = (ushort *)vc->vc_pos;
2601 myx = vc->vc_x;
2602 if (c == 10 || c == 13)
2603 continue;
2604 }
2605 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2606 notify_write(vc, c);
1da177e4
LT		 2607 cnt++;
2608 if (myx == vc->vc_cols - 1) {
2609 vc->vc_need_wrap = 1;
2610 continue;
2611 }
2612 vc->vc_pos += 2;
2613 myx++;
2614 }
2615 if (cnt > 0) {
6ca8dfd7 2616 if (con_is_visible(vc))
1da177e4
LT		 2617 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2618 vc->vc_x += cnt;
2619 if (vc->vc_x == vc->vc_cols) {
2620 vc->vc_x--;
2621 vc->vc_need_wrap = 1;
2622 }
2623 }
2624 set_cursor(vc);
b293d758 2625 notify_update(vc);
1da177e4
LT		 2626
2627quit:
b0940003 2628 spin_unlock(&printing_lock);
1da177e4
LT		 2629}
2630
2631static struct tty_driver *vt_console_device(struct console *c, int *index)
2632{
2633 *index = c->index ? c->index-1 : fg_console;
2634 return console_driver;
2635}
2636
2637static struct console vt_console_driver = {
2638 .name = "tty",
2639 .write = vt_console_print,
2640 .device = vt_console_device,
2641 .unblank = unblank_screen,
2642 .flags = CON_PRINTBUFFER,
2643 .index = -1,
2644};
2645#endif
2646
2647/*
2648 * Handling of Linux-specific VC ioctls
2649 */
2650
2651/*
ac751efa 2652 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2653 *
2654 * There are some functions which don't need it.
2655 *
2656 * There are some functions which can sleep for arbitrary periods
2657 * (paste_selection) but we don't need the lock there anyway.
2658 *
2659 * set_selection has locking, and definitely needs it
2660 */
2661
2662int tioclinux(struct tty_struct *tty, unsigned long arg)
2663{
2664 char type, data;
2665 char __user *p = (char __user *)arg;
2666 int lines;
2667 int ret;
2668
1da177e4
LT		 2669 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2670 return -EPERM;
2671 if (get_user(type, p))
2672 return -EFAULT;
2673 ret = 0;
04f378b1 2674
1da177e4
LT		 2675 switch (type)
2676 {
2677 case TIOCL_SETSEL:
ac751efa 2678 console_lock();
1da177e4 2679 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2680 console_unlock();
1da177e4
LT		 2681 break;
2682 case TIOCL_PASTESEL:
2683 ret = paste_selection(tty);
2684 break;
2685 case TIOCL_UNBLANKSCREEN:
ac751efa 2686 console_lock();
1da177e4 2687 unblank_screen();
ac751efa 2688 console_unlock();
1da177e4
LT		 2689 break;
2690 case TIOCL_SELLOADLUT:
5289475d 2691 console_lock();
1da177e4 2692 ret = sel_loadlut(p);
5289475d 2693 console_unlock();
1da177e4
LT		 2694 break;
2695 case TIOCL_GETSHIFTSTATE:
04f378b1 2696
1da177e4
LT		 2697 /*
2698 * Make it possible to react to Shift+Mousebutton.
2699 * Note that 'shift_state' is an undocumented
2700 * kernel-internal variable; programs not closely
2701 * related to the kernel should not use this.
2702 */
079c9534 2703 data = vt_get_shift_state();
1da177e4
LT		 2704 ret = __put_user(data, p);
2705 break;
2706 case TIOCL_GETMOUSEREPORTING:
20f62579 2707 console_lock(); /* May be overkill */
1da177e4 2708 data = mouse_reporting();
20f62579 2709 console_unlock();
1da177e4
LT		 2710 ret = __put_user(data, p);
2711 break;
2712 case TIOCL_SETVESABLANK:
20f62579 2713 console_lock();
403aac96 2714 ret = set_vesa_blanking(p);
20f62579 2715 console_unlock();
1da177e4 2716 break;
0ca07731 2717 case TIOCL_GETKMSGREDIRECT:
5ada918b 2718 data = vt_get_kmsg_redirect();
0ca07731
RW		 2719 ret = __put_user(data, p);
2720 break;
1da177e4
LT		 2721 case TIOCL_SETKMSGREDIRECT:
2722 if (!capable(CAP_SYS_ADMIN)) {
2723 ret = -EPERM;
2724 } else {
2725 if (get_user(data, p+1))
2726 ret = -EFAULT;
2727 else
5ada918b 2728 vt_kmsg_redirect(data);
1da177e4
LT		 2729 }
2730 break;
2731 case TIOCL_GETFGCONSOLE:
20f62579
AC		 2732 /* No locking needed as this is a transiently
2733 correct return anyway if the caller hasn't
2734 disabled switching */
1da177e4
LT		 2735 ret = fg_console;
2736 break;
2737 case TIOCL_SCROLLCONSOLE:
2738 if (get_user(lines, (s32 __user *)(p+4))) {
2739 ret = -EFAULT;
2740 } else {
20f62579
AC		 2741 /* Need the console lock here. Note that lots
2742 of other calls need fixing before the lock
2743 is actually useful ! */
2744 console_lock();
1da177e4 2745 scrollfront(vc_cons[fg_console].d, lines);
20f62579 2746 console_unlock();
1da177e4
LT		 2747 ret = 0;
2748 }
2749 break;
2750 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2751 console_lock();
1da177e4
LT		 2752 ignore_poke = 1;
2753 do_blank_screen(0);
ac751efa 2754 console_unlock();
1da177e4
LT		 2755 break;
2756 case TIOCL_BLANKEDSCREEN:
2757 ret = console_blanked;
2758 break;
2759 default:
2760 ret = -EINVAL;
2761 break;
2762 }
2763 return ret;
2764}
2765
2766/*
2767 * /dev/ttyN handling
2768 */
2769
2770static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2771{
2772 int retval;
2773
2774 retval = do_con_write(tty, buf, count);
2775 con_flush_chars(tty);
2776
2777 return retval;
2778}
2779
5d19f546 2780static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2781{
2782 if (in_interrupt())
5d19f546
AC		 2783 return 0; /* n_r3964 calls put_char() from interrupt context */
2784 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2785}
2786
2787static int con_write_room(struct tty_struct *tty)
2788{
2789 if (tty->stopped)
2790 return 0;
a88a69c9 2791 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2792}
2793
2794static int con_chars_in_buffer(struct tty_struct *tty)
2795{
2796 return 0; /* we're not buffering */
2797}
2798
2799/*
2800 * con_throttle and con_unthrottle are only used for
2801 * paste_selection(), which has to stuff in a large number of
2802 * characters...
2803 */
2804static void con_throttle(struct tty_struct *tty)
2805{
2806}
2807
2808static void con_unthrottle(struct tty_struct *tty)
2809{
2810 struct vc_data *vc = tty->driver_data;
2811
2812 wake_up_interruptible(&vc->paste_wait);
2813}
2814
2815/*
2816 * Turn the Scroll-Lock LED on when the tty is stopped
2817 */
2818static void con_stop(struct tty_struct *tty)
2819{
2820 int console_num;
2821 if (!tty)
2822 return;
2823 console_num = tty->index;
2824 if (!vc_cons_allocated(console_num))
2825 return;
079c9534 2826 vt_kbd_con_stop(console_num);
1da177e4
LT		 2827}
2828
2829/*
2830 * Turn the Scroll-Lock LED off when the console is started
2831 */
2832static void con_start(struct tty_struct *tty)
2833{
2834 int console_num;
2835 if (!tty)
2836 return;
2837 console_num = tty->index;
2838 if (!vc_cons_allocated(console_num))
2839 return;
079c9534 2840 vt_kbd_con_start(console_num);
1da177e4
LT		 2841}
2842
2843static void con_flush_chars(struct tty_struct *tty)
2844{
2845 struct vc_data *vc;
2846
2847 if (in_interrupt()) /* from flush_to_ldisc */
2848 return;
2849
2850 /* if we race with con_close(), vt may be null */
ac751efa 2851 console_lock();
1da177e4
LT		 2852 vc = tty->driver_data;
2853 if (vc)
2854 set_cursor(vc);
ac751efa 2855 console_unlock();
1da177e4
LT		 2856}
2857
2858/*
2859 * Allocate the console screen memory.
2860 */
bc1e99d9 2861static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 2862{
2863 unsigned int currcons = tty->index;
bc1e99d9
JS		 2864 struct vc_data *vc;
2865 int ret;
1da177e4 2866
ac751efa 2867 console_lock();
bc1e99d9
JS		 2868 ret = vc_allocate(currcons);
2869 if (ret)
2870 goto unlock;
feebed65 2871
bc1e99d9 2872 vc = vc_cons[currcons].d;
1da177e4 2873
bc1e99d9
JS		 2874 /* Still being freed */
2875 if (vc->port.tty) {
2876 ret = -ERESTARTSYS;
2877 goto unlock;
2878 }
2879
2880 ret = tty_port_install(&vc->port, driver, tty);
2881 if (ret)
2882 goto unlock;
2883
2884 tty->driver_data = vc;
2885 vc->port.tty = tty;
2886
2887 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2888 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2889 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 2890 }
bc1e99d9 2891 if (vc->vc_utf)
adc8d746 2892 tty->termios.c_iflag |= IUTF8;
bc1e99d9 2893 else
adc8d746 2894 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 2895unlock:
ac751efa 2896 console_unlock();
1da177e4
LT		 2897 return ret;
2898}
2899
bc1e99d9
JS		 2900static int con_open(struct tty_struct *tty, struct file *filp)
2901{
2902 /* everything done in install */
2903 return 0;
2904}
2905
2906
1da177e4
LT		 2907static void con_close(struct tty_struct *tty, struct file *filp)
2908{
feebed65
AC		 2909 /* Nothing to do - we defer to shutdown */
2910}
1da177e4 2911
feebed65
AC		 2912static void con_shutdown(struct tty_struct *tty)
2913{
2914 struct vc_data *vc = tty->driver_data;
2915 BUG_ON(vc == NULL);
ac751efa 2916 console_lock();
8ce73264 2917 vc->port.tty = NULL;
ac751efa 2918 console_unlock();
1da177e4
LT		 2919}
2920
3855ae1c 2921static int default_color = 7; /* white */
fa6ce9ab
JE		 2922static int default_italic_color = 2; // green (ASCII)
2923static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 2924module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 2925module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2926module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2927
1da177e4
LT		 2928static void vc_init(struct vc_data *vc, unsigned int rows,
2929 unsigned int cols, int do_clear)
2930{
2931 int j, k ;
2932
2933 vc->vc_cols = cols;
2934 vc->vc_rows = rows;
2935 vc->vc_size_row = cols << 1;
2936 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2937
2938 set_origin(vc);
2939 vc->vc_pos = vc->vc_origin;
2940 reset_vc(vc);
2941 for (j=k=0; j<16; j++) {
2942 vc->vc_palette[k++] = default_red[j] ;
2943 vc->vc_palette[k++] = default_grn[j] ;
2944 vc->vc_palette[k++] = default_blu[j] ;
2945 }
3855ae1c 2946 vc->vc_def_color = default_color;
fa6ce9ab
JE		 2947 vc->vc_ulcolor = default_underline_color;
2948 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2949 vc->vc_halfcolor = 0x08; /* grey */
2950 init_waitqueue_head(&vc->paste_wait);
2951 reset_terminal(vc, do_clear);
2952}
2953
2954/*
2955 * This routine initializes console interrupts, and does nothing
2956 * else. If you want the screen to clear, call tty_write with
2957 * the appropriate escape-sequence.
2958 */
2959
2960static int __init con_init(void)
2961{
2962 const char *display_desc = NULL;
2963 struct vc_data *vc;
3e795de7 2964 unsigned int currcons = 0, i;
1da177e4 2965
ac751efa 2966 console_lock();
1da177e4
LT		 2967
2968 if (conswitchp)
2969 display_desc = conswitchp->con_startup();
2970 if (!display_desc) {
2971 fg_console = 0;
ac751efa 2972 console_unlock();
1da177e4
LT		 2973 return 0;
2974 }
2975
3e795de7
AD		 2976 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2977 struct con_driver *con_driver = &registered_con_driver[i];
2978
2979 if (con_driver->con == NULL) {
2980 con_driver->con = conswitchp;
2981 con_driver->desc = display_desc;
2982 con_driver->flag = CON_DRIVER_FLAG_INIT;
2983 con_driver->first = 0;
2984 con_driver->last = MAX_NR_CONSOLES - 1;
2985 break;
2986 }
2987 }
2988
2989 for (i = 0; i < MAX_NR_CONSOLES; i++)
2990 con_driver_map[i] = conswitchp;
2991
1da177e4
LT		 2992 if (blankinterval) {
2993 blank_state = blank_normal_wait;
f324edc8 2994 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2995 }
2996
1da177e4 2997 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2998 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2999 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 3000 tty_port_init(&vc->port);
1da177e4 3001 visual_init(vc, currcons, 1);
a5f4f52e 3002 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 3003 vc_init(vc, vc->vc_rows, vc->vc_cols,
3004 currcons || !vc->vc_sw->con_save_screen);
3005 }
3006 currcons = fg_console = 0;
3007 master_display_fg = vc = vc_cons[currcons].d;
3008 set_origin(vc);
3009 save_screen(vc);
3010 gotoxy(vc, vc->vc_x, vc->vc_y);
3011 csi_J(vc, 0);
3012 update_screen(vc);
5da527aa 3013 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3014 vc->vc_can_do_color ? "colour" : "mono",
3015 display_desc, vc->vc_cols, vc->vc_rows);
3016 printable = 1;
1da177e4 3017
ac751efa 3018 console_unlock();
1da177e4
LT		 3019
3020#ifdef CONFIG_VT_CONSOLE
3021 register_console(&vt_console_driver);
3022#endif
3023 return 0;
3024}
3025console_initcall(con_init);
3026
b68e31d0 3027static const struct tty_operations con_ops = {
bc1e99d9 3028 .install = con_install,
1da177e4
LT		 3029 .open = con_open,
3030 .close = con_close,
3031 .write = con_write,
3032 .write_room = con_write_room,
3033 .put_char = con_put_char,
3034 .flush_chars = con_flush_chars,
3035 .chars_in_buffer = con_chars_in_buffer,
3036 .ioctl = vt_ioctl,
e9216651
AB		 3037#ifdef CONFIG_COMPAT
3038 .compat_ioctl = vt_compat_ioctl,
3039#endif
1da177e4
LT		 3040 .stop = con_stop,
3041 .start = con_start,
3042 .throttle = con_throttle,
3043 .unthrottle = con_unthrottle,
8c9a9dd0 3044 .resize = vt_resize,
feebed65 3045 .shutdown = con_shutdown
1da177e4
LT		 3046};
3047
d81ed103
AC		 3048static struct cdev vc0_cdev;
3049
fbc92a34
KS		 3050static ssize_t show_tty_active(struct device *dev,
3051 struct device_attribute *attr, char *buf)
3052{
3053 return sprintf(buf, "tty%d\n", fg_console + 1);
3054}
3055static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3056
1083a7be
TI		 3057static struct attribute *vt_dev_attrs[] = {
3058 &dev_attr_active.attr,
3059 NULL
3060};
3061
3062ATTRIBUTE_GROUPS(vt_dev);
3063
d81ed103 3064int __init vty_init(const struct file_operations *console_fops)
1da177e4 3065{
d81ed103
AC		 3066 cdev_init(&vc0_cdev, console_fops);
3067 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3068 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3069 panic("Couldn't register /dev/tty0 driver\n");
1083a7be
TI		 3070 tty0dev = device_create_with_groups(tty_class, NULL,
3071 MKDEV(TTY_MAJOR, 0), NULL,
3072 vt_dev_groups, "tty0");
fbc92a34
KS		 3073 if (IS_ERR(tty0dev))
3074 tty0dev = NULL;
d81ed103 3075
1da177e4
LT		 3076 vcs_init();
3077
3078 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3079 if (!console_driver)
3080 panic("Couldn't allocate console driver\n");
2f16669d 3081
1da177e4
LT		 3082 console_driver->name = "tty";
3083 console_driver->name_base = 1;
3084 console_driver->major = TTY_MAJOR;
3085 console_driver->minor_start = 1;
3086 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3087 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3088 if (default_utf8)
3089 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3090 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3091 tty_set_operations(console_driver, &con_ops);
3092 if (tty_register_driver(console_driver))
3093 panic("Couldn't register console driver\n");
1da177e4
LT		 3094 kbd_init();
3095 console_map_init();
1da177e4
LT		 3096#ifdef CONFIG_MDA_CONSOLE
3097 mda_console_init();
3098#endif
3099 return 0;
3100}
3101
3102#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3103
3104static struct class *vtconsole_class;
3105
50e244cc 3106static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3107 int deflt)
1da177e4 3108{
3e795de7
AD		 3109 struct module *owner = csw->owner;
3110 const char *desc = NULL;
3111 struct con_driver *con_driver;
3112 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3113
1da177e4
LT		 3114 if (!try_module_get(owner))
3115 return -ENODEV;
3116
50e244cc 3117 WARN_CONSOLE_UNLOCKED();
1c8ce271 3118
3e795de7
AD		 3119 /* check if driver is registered */
3120 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3121 con_driver = &registered_con_driver[i];
3122
3123 if (con_driver->con == csw) {
3124 desc = con_driver->desc;
3125 retval = 0;
3126 break;
3127 }
3128 }
3129
3130 if (retval)
3131 goto err;
3132
3133 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3134 csw->con_startup();
3135 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3136 }
1c8ce271 3137
1da177e4
LT		 3138 if (deflt) {
3139 if (conswitchp)
3140 module_put(conswitchp->owner);
1c8ce271 3141
1da177e4
LT		 3142 __module_get(owner);
3143 conswitchp = csw;
3144 }
3145
3e795de7
AD		 3146 first = max(first, con_driver->first);
3147 last = min(last, con_driver->last);
3148
1da177e4
LT		 3149 for (i = first; i <= last; i++) {
3150 int old_was_color;
3151 struct vc_data *vc = vc_cons[i].d;
3152
3153 if (con_driver_map[i])
3154 module_put(con_driver_map[i]->owner);
3155 __module_get(owner);
3156 con_driver_map[i] = csw;
3157
3158 if (!vc || !vc->vc_sw)
3159 continue;
3160
3161 j = i;
1c8ce271 3162
6ca8dfd7 3163 if (con_is_visible(vc)) {
4ee1acce 3164 k = i;
1da177e4 3165 save_screen(vc);
4ee1acce
DH		 3166 }
3167
1da177e4
LT		 3168 old_was_color = vc->vc_can_do_color;
3169 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3170 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3171 visual_init(vc, i, 0);
1c8ce271 3172 set_origin(vc);
1da177e4
LT		 3173 update_attr(vc);
3174
3175 /* If the console changed between mono <-> color, then
3176 * the attributes in the screenbuf will be wrong. The
3177 * following resets all attributes to something sane.
3178 */
3179 if (old_was_color != vc->vc_can_do_color)
3180 clear_buffer_attributes(vc);
1da177e4 3181 }
4ee1acce 3182
1ffdda95 3183 pr_info("Console: switching ");
1da177e4 3184 if (!deflt)
4bcc595c 3185 printk(KERN_CONT "consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3186 if (j >= 0) {
3187 struct vc_data *vc = vc_cons[j].d;
3188
4bcc595c 3189 printk(KERN_CONT "to %s %s %dx%d\n",
4ee1acce
DH		 3190 vc->vc_can_do_color ? "colour" : "mono",
3191 desc, vc->vc_cols, vc->vc_rows);
3192
3193 if (k >= 0) {
3194 vc = vc_cons[k].d;
3195 update_screen(vc);
3196 }
3197 } else
4bcc595c 3198 printk(KERN_CONT "to %s\n", desc);
1da177e4 3199
3e795de7
AD		 3200 retval = 0;
3201err:
1da177e4 3202 module_put(owner);
3e795de7
AD		 3203 return retval;
3204};
1da177e4 3205
50e244cc 3206
13ae6645 3207#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86
TI		 3208/* unlocked version of unbind_con_driver() */
3209int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3210{
3e795de7
AD		 3211 struct module *owner = csw->owner;
3212 const struct consw *defcsw = NULL;
3213 struct con_driver *con_driver = NULL, *con_back = NULL;
3214 int i, retval = -ENODEV;
1da177e4 3215
3e795de7
AD		 3216 if (!try_module_get(owner))
3217 return -ENODEV;
3218
e93a9a86 3219 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3220
3221 /* check if driver is registered and if it is unbindable */
3222 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3223 con_driver = &registered_con_driver[i];
3224
3225 if (con_driver->con == csw &&
6db4063c 3226 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3227 retval = 0;
3228 break;
3229 }
3230 }
3231
e93a9a86 3232 if (retval)
3e795de7 3233 goto err;
3e795de7 3234
6db4063c
AD		 3235 retval = -ENODEV;
3236
3e795de7
AD		 3237 /* check if backup driver exists */
3238 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3239 con_back = &registered_con_driver[i];
3240
249f7b3e 3241 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3242 defcsw = con_back->con;
3243 retval = 0;
3244 break;
3245 }
3246 }
3247
e93a9a86 3248 if (retval)
3e795de7 3249 goto err;
3e795de7 3250
e93a9a86 3251 if (!con_is_bound(csw))
3e795de7 3252 goto err;
3e795de7
AD		 3253
3254 first = max(first, con_driver->first);
3255 last = min(last, con_driver->last);
3256
3257 for (i = first; i <= last; i++) {
1da177e4
LT		 3258 if (con_driver_map[i] == csw) {
3259 module_put(csw->owner);
3260 con_driver_map[i] = NULL;
3261 }
3e795de7
AD		 3262 }
3263
3264 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3265 const struct consw *defconsw = conswitchp;
3266
3e795de7
AD		 3267 defcsw->con_startup();
3268 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3269 /*
3270 * vgacon may change the default driver to point
3271 * to dummycon, we restore it here...
3272 */
3273 conswitchp = defconsw;
3e795de7
AD		 3274 }
3275
3276 if (!con_is_bound(csw))
3277 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3278
6db4063c 3279 /* ignore return value, binding should not fail */
50e244cc 3280 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3281err:
3282 module_put(owner);
3283 return retval;
3284
3285}
e93a9a86 3286EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3287
6db4063c
AD		 3288static int vt_bind(struct con_driver *con)
3289{
3290 const struct consw *defcsw = NULL, *csw = NULL;
3291 int i, more = 1, first = -1, last = -1, deflt = 0;
3292
77232f79 3293 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3294 goto err;
3295
3296 csw = con->con;
3297
3298 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3299 struct con_driver *con = &registered_con_driver[i];
3300
3301 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3302 defcsw = con->con;
3303 break;
3304 }
3305 }
3306
3307 if (!defcsw)
3308 goto err;
3309
3310 while (more) {
3311 more = 0;
3312
3313 for (i = con->first; i <= con->last; i++) {
3314 if (con_driver_map[i] == defcsw) {
3315 if (first == -1)
3316 first = i;
3317 last = i;
3318 more = 1;
3319 } else if (first != -1)
3320 break;
3321 }
3322
3323 if (first == 0 && last == MAX_NR_CONSOLES -1)
3324 deflt = 1;
3325
4c215fe8 3326 if (first != -1)
c62a1e57 3327 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3328
3329 first = -1;
3330 last = -1;
3331 deflt = 0;
3332 }
3333
3334err:
3335 return 0;
3336}
3337
3338static int vt_unbind(struct con_driver *con)
3339{
3340 const struct consw *csw = NULL;
3341 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3342 int ret;
6db4063c 3343
77232f79 3344 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3345 goto err;
3346
3347 csw = con->con;
3348
3349 while (more) {
3350 more = 0;
3351
3352 for (i = con->first; i <= con->last; i++) {
3353 if (con_driver_map[i] == csw) {
3354 if (first == -1)
3355 first = i;
3356 last = i;
3357 more = 1;
3358 } else if (first != -1)
3359 break;
3360 }
3361
3362 if (first == 0 && last == MAX_NR_CONSOLES -1)
3363 deflt = 1;
3364
618f2b90 3365 if (first != -1) {
f418f2ec 3366 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3367 if (ret != 0)
3368 return ret;
618f2b90 3369 }
6db4063c
AD		 3370
3371 first = -1;
3372 last = -1;
3373 deflt = 0;
3374 }
3375
3376err:
3377 return 0;
3378}
13ae6645
AD		 3379#else
3380static inline int vt_bind(struct con_driver *con)
3381{
3382 return 0;
3383}
3384static inline int vt_unbind(struct con_driver *con)
3385{
3386 return 0;
3387}
3388#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3389
805952a8 3390static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3391 const char *buf, size_t count)
3392{
805952a8 3393 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3394 int bind = simple_strtoul(buf, NULL, 0);
3395
4c215fe8
ID		 3396 console_lock();
3397
6db4063c
AD		 3398 if (bind)
3399 vt_bind(con);
3400 else
3401 vt_unbind(con);
3402
4c215fe8
ID		 3403 console_unlock();
3404
6db4063c
AD		 3405 return count;
3406}
3407
805952a8
GKH		 3408static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3409 char *buf)
6db4063c 3410{
805952a8 3411 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3412 int bind = con_is_bound(con->con);
3413
3414 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3415}
3416
805952a8
GKH		 3417static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3418 char *buf)
6db4063c 3419{
805952a8 3420 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3421
3422 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3423 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3424 con->desc);
3425
3426}
3427
1083a7be
TI		 3428static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3429static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3430
3431static struct attribute *con_dev_attrs[] = {
3432 &dev_attr_bind.attr,
3433 &dev_attr_name.attr,
3434 NULL
6db4063c
AD		 3435};
3436
1083a7be
TI		 3437ATTRIBUTE_GROUPS(con_dev);
3438
805952a8 3439static int vtconsole_init_device(struct con_driver *con)
6db4063c 3440{
928e964f 3441 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3442 return 0;
6db4063c
AD		 3443}
3444
805952a8 3445static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3446{
1083a7be 3447 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3448}
3449
3e795de7
AD		 3450/**
3451 * con_is_bound - checks if driver is bound to the console
3452 * @csw: console driver
3453 *
3454 * RETURNS: zero if unbound, nonzero if bound
3455 *
3456 * Drivers can call this and if zero, they should release
3457 * all resources allocated on con_startup()
3458 */
3459int con_is_bound(const struct consw *csw)
3460{
3461 int i, bound = 0;
3462
3463 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3464 if (con_driver_map[i] == csw) {
3465 bound = 1;
3466 break;
3467 }
3468 }
3469
3470 return bound;
3471}
3472EXPORT_SYMBOL(con_is_bound);
3473
b45cfba4
JB		 3474/**
3475 * con_debug_enter - prepare the console for the kernel debugger
3476 * @sw: console driver
3477 *
3478 * Called when the console is taken over by the kernel debugger, this
3479 * function needs to save the current console state, then put the console
3480 * into a state suitable for the kernel debugger.
3481 *
3482 * RETURNS:
3483 * Zero on success, nonzero if a failure occurred when trying to prepare
3484 * the console for the debugger.
3485 */
3486int con_debug_enter(struct vc_data *vc)
3487{
3488 int ret = 0;
3489
3490 saved_fg_console = fg_console;
3491 saved_last_console = last_console;
3492 saved_want_console = want_console;
3493 saved_vc_mode = vc->vc_mode;
beed5336 3494 saved_console_blanked = console_blanked;
b45cfba4
JB		 3495 vc->vc_mode = KD_TEXT;
3496 console_blanked = 0;
3497 if (vc->vc_sw->con_debug_enter)
3498 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3499#ifdef CONFIG_KGDB_KDB
3500 /* Set the initial LINES variable if it is not already set */
3501 if (vc->vc_rows < 999) {
3502 int linecount;
3503 char lns[4];
3504 const char *setargs[3] = {
3505 "set",
3506 "LINES",
3507 lns,
3508 };
3509 if (kdbgetintenv(setargs[0], &linecount)) {
3510 snprintf(lns, 4, "%i", vc->vc_rows);
3511 kdb_set(2, setargs);
3512 }
3513 }
17b572e8
JW		 3514 if (vc->vc_cols < 999) {
3515 int colcount;
3516 char cols[4];
3517 const char *setargs[3] = {
3518 "set",
3519 "COLUMNS",
3520 cols,
3521 };
3522 if (kdbgetintenv(setargs[0], &colcount)) {
3523 snprintf(cols, 4, "%i", vc->vc_cols);
3524 kdb_set(2, setargs);
3525 }
3526 }
81d44507 3527#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3528 return ret;
3529}
3530EXPORT_SYMBOL_GPL(con_debug_enter);
3531
3532/**
3533 * con_debug_leave - restore console state
3534 * @sw: console driver
3535 *
3536 * Restore the console state to what it was before the kernel debugger
3537 * was invoked.
3538 *
3539 * RETURNS:
3540 * Zero on success, nonzero if a failure occurred when trying to restore
3541 * the console.
3542 */
3543int con_debug_leave(void)
3544{
3545 struct vc_data *vc;
3546 int ret = 0;
3547
3548 fg_console = saved_fg_console;
3549 last_console = saved_last_console;
3550 want_console = saved_want_console;
beed5336 3551 console_blanked = saved_console_blanked;
b45cfba4
JB		 3552 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3553
3554 vc = vc_cons[fg_console].d;
3555 if (vc->vc_sw->con_debug_leave)
3556 ret = vc->vc_sw->con_debug_leave(vc);
3557 return ret;
3558}
3559EXPORT_SYMBOL_GPL(con_debug_leave);
3560
50e244cc 3561static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 3562{
3563 struct module *owner = csw->owner;
3564 struct con_driver *con_driver;
3565 const char *desc;
96317e9e 3566 int i, retval;
3e795de7 3567
50e244cc
AC		 3568 WARN_CONSOLE_UNLOCKED();
3569
3e795de7
AD		 3570 if (!try_module_get(owner))
3571 return -ENODEV;
3572
3e795de7
AD		 3573 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3574 con_driver = &registered_con_driver[i];
3575
3576 /* already registered */
96317e9e 3577 if (con_driver->con == csw) {
c55c63c6 3578 retval = -EBUSY;
96317e9e
JS		 3579 goto err;
3580 }
3e795de7
AD		 3581 }
3582
3e795de7 3583 desc = csw->con_startup();
6798df4c
JS		 3584 if (!desc) {
3585 retval = -ENODEV;
3e795de7 3586 goto err;
6798df4c 3587 }
3e795de7
AD		 3588
3589 retval = -EINVAL;
3590
3591 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3592 con_driver = &registered_con_driver[i];
3593
d364b5c3
ID		 3594 if (con_driver->con == NULL &&
3595 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 3596 con_driver->con = csw;
3597 con_driver->desc = desc;
6db4063c
AD		 3598 con_driver->node = i;
3599 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3600 CON_DRIVER_FLAG_INIT;
3601 con_driver->first = first;
3602 con_driver->last = last;
3603 retval = 0;
3604 break;
3605 }
3606 }
3607
6db4063c
AD		 3608 if (retval)
3609 goto err;
3610
1083a7be
TI		 3611 con_driver->dev =
3612 device_create_with_groups(vtconsole_class, NULL,
3613 MKDEV(0, con_driver->node),
3614 con_driver, con_dev_groups,
3615 "vtcon%i", con_driver->node);
805952a8
GKH		 3616 if (IS_ERR(con_driver->dev)) {
3617 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3618 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3619 PTR_ERR(con_driver->dev));
3620 con_driver->dev = NULL;
6db4063c 3621 } else {
805952a8 3622 vtconsole_init_device(con_driver);
6db4063c 3623 }
928e964f 3624
3e795de7 3625err:
3e795de7
AD		 3626 module_put(owner);
3627 return retval;
3628}
50e244cc 3629
3e795de7
AD		 3630
3631/**
50539dd4 3632 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 3633 * @csw: console driver
3634 *
3635 * DESCRIPTION: All drivers that registers to the console layer must
3636 * call this function upon exit, or if the console driver is in a state
3637 * where it won't be able to handle console services, such as the
3638 * framebuffer console without loaded framebuffer drivers.
3639 *
3640 * The driver must unbind first prior to unregistration.
3641 */
e93a9a86
TI		 3642int do_unregister_con_driver(const struct consw *csw)
3643{
d9c660e7 3644 int i;
3e795de7
AD		 3645
3646 /* cannot unregister a bound driver */
3647 if (con_is_bound(csw))
d9c660e7
DV		 3648 return -EBUSY;
3649
3650 if (csw == conswitchp)
3651 return -EINVAL;
3e795de7
AD		 3652
3653 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3654 struct con_driver *con_driver = &registered_con_driver[i];
3655
2cf30f75 3656 if (con_driver->con == csw) {
d364b5c3
ID		 3657 /*
3658 * Defer the removal of the sysfs entries since that
3659 * will acquire the kernfs s_active lock and we can't
3660 * acquire this lock while holding the console lock:
3661 * the unbind sysfs entry imposes already the opposite
3662 * order. Reset con already here to prevent any later
3663 * lookup to succeed and mark this slot as zombie, so
3664 * it won't get reused until we complete the removal
3665 * in the deferred work.
3666 */
3e795de7 3667 con_driver->con = NULL;
d364b5c3
ID		 3668 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3669 schedule_work(&con_driver_unregister_work);
3670
d9c660e7 3671 return 0;
3e795de7
AD		 3672 }
3673 }
d9c660e7
DV		 3674
3675 return -ENODEV;
3e795de7 3676}
e93a9a86 3677EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 3678
d364b5c3
ID		 3679static void con_driver_unregister_callback(struct work_struct *ignored)
3680{
3681 int i;
3682
3683 console_lock();
3684
3685 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3686 struct con_driver *con_driver = &registered_con_driver[i];
3687
3688 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3689 continue;
3690
3691 console_unlock();
3692
3693 vtconsole_deinit_device(con_driver);
3694 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3695
3696 console_lock();
3697
3698 if (WARN_ON_ONCE(con_driver->con))
3699 con_driver->con = NULL;
3700 con_driver->desc = NULL;
3701 con_driver->dev = NULL;
3702 con_driver->node = 0;
3703 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3704 con_driver->flag = 0;
3705 con_driver->first = 0;
3706 con_driver->last = 0;
3707 }
3708
3709 console_unlock();
3710}
3711
3e795de7
AD		 3712/*
3713 * If we support more console drivers, this function is used
3714 * when a driver wants to take over some existing consoles
3715 * and become default driver for newly opened ones.
3716 *
155957f5 3717 * do_take_over_console is basically a register followed by unbind
50e244cc
AC		 3718 */
3719int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3720{
3721 int err;
3722
3723 err = do_register_con_driver(csw, first, last);
3724 /*
3725 * If we get an busy error we still want to bind the console driver
3726 * and return success, as we may have unbound the console driver
3727 * but not unregistered it.
3728 */
3729 if (err == -EBUSY)
3730 err = 0;
3731 if (!err)
3732 do_bind_con_driver(csw, first, last, deflt);
3733
3734 return err;
3735}
3736EXPORT_SYMBOL_GPL(do_take_over_console);
3737
3e795de7
AD		 3738
3739/*
3740 * give_up_console is a wrapper to unregister_con_driver. It will only
3741 * work if driver is fully unbound.
3742 */
3743void give_up_console(const struct consw *csw)
3744{
70125e76
WY		 3745 console_lock();
3746 do_unregister_con_driver(csw);
3747 console_unlock();
3e795de7
AD		 3748}
3749
6db4063c 3750static int __init vtconsole_class_init(void)
3e795de7 3751{
6db4063c 3752 int i;
3e795de7 3753
6db4063c
AD		 3754 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3755 if (IS_ERR(vtconsole_class)) {
3756 printk(KERN_WARNING "Unable to create vt console class; "
3757 "errno = %ld\n", PTR_ERR(vtconsole_class));
3758 vtconsole_class = NULL;
3759 }
3e795de7 3760
6db4063c 3761 /* Add system drivers to sysfs */
3e795de7
AD		 3762 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3763 struct con_driver *con = &registered_con_driver[i];
3764
805952a8 3765 if (con->con && !con->dev) {
1083a7be
TI		 3766 con->dev =
3767 device_create_with_groups(vtconsole_class, NULL,
3768 MKDEV(0, con->node),
3769 con, con_dev_groups,
3770 "vtcon%i", con->node);
6db4063c 3771
805952a8 3772 if (IS_ERR(con->dev)) {
6db4063c 3773 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3774 "device for %s; errno = %ld\n",
3775 con->desc, PTR_ERR(con->dev));
3776 con->dev = NULL;
6db4063c 3777 } else {
805952a8 3778 vtconsole_init_device(con);
6db4063c 3779 }
3e795de7 3780 }
3e795de7
AD		 3781 }
3782
3e795de7
AD		 3783 return 0;
3784}
6db4063c 3785postcore_initcall(vtconsole_class_init);
3e795de7 3786
1da177e4
LT		 3787#endif
3788
3789/*
3790 * Screen blanking
3791 */
3792
403aac96 3793static int set_vesa_blanking(char __user *p)
1da177e4 3794{
403aac96
YY		 3795 unsigned int mode;
3796
3797 if (get_user(mode, p + 1))
3798 return -EFAULT;
3799
3800 vesa_blank_mode = (mode < 4) ? mode : 0;
3801 return 0;
1da177e4
LT		 3802}
3803
1da177e4
LT		 3804void do_blank_screen(int entering_gfx)
3805{
3806 struct vc_data *vc = vc_cons[fg_console].d;
3807 int i;
3808
3809 WARN_CONSOLE_UNLOCKED();
3810
3811 if (console_blanked) {
3812 if (blank_state == blank_vesa_wait) {
3813 blank_state = blank_off;
d060a321 3814 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3815 }
3816 return;
3817 }
1da177e4
LT		 3818
3819 /* entering graphics mode? */
3820 if (entering_gfx) {
3821 hide_cursor(vc);
3822 save_screen(vc);
3823 vc->vc_sw->con_blank(vc, -1, 1);
3824 console_blanked = fg_console + 1;
b6e8f00f 3825 blank_state = blank_off;
1da177e4
LT		 3826 set_origin(vc);
3827 return;
3828 }
3829
b6e8f00f 3830 if (blank_state != blank_normal_wait)
3831 return;
3832 blank_state = blank_off;
3833
1da177e4
LT		 3834 /* don't blank graphics */
3835 if (vc->vc_mode != KD_TEXT) {
3836 console_blanked = fg_console + 1;
3837 return;
3838 }
3839
3840 hide_cursor(vc);
3841 del_timer_sync(&console_timer);
3842 blank_timer_expired = 0;
3843
3844 save_screen(vc);
3845 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3846 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3847 console_blanked = fg_console + 1;
3848 if (i)
3849 set_origin(vc);
3850
3851 if (console_blank_hook && console_blank_hook(1))
3852 return;
3853
d060a321 3854 if (vesa_off_interval && vesa_blank_mode) {
030babac 3855 blank_state = blank_vesa_wait;
1da177e4
LT		 3856 mod_timer(&console_timer, jiffies + vesa_off_interval);
3857 }
8b92e87d 3858 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3859}
3860EXPORT_SYMBOL(do_blank_screen);
3861
3862/*
3863 * Called by timer as well as from vt_console_driver
3864 */
3865void do_unblank_screen(int leaving_gfx)
3866{
3867 struct vc_data *vc;
3868
3869 /* This should now always be called from a "sane" (read: can schedule)
3870 * context for the sake of the low level drivers, except in the special
3871 * case of oops_in_progress
3872 */
3873 if (!oops_in_progress)
3874 might_sleep();
3875
3876 WARN_CONSOLE_UNLOCKED();
3877
3878 ignore_poke = 0;
3879 if (!console_blanked)
3880 return;
3881 if (!vc_cons_allocated(fg_console)) {
3882 /* impossible */
e620e548
JP		 3883 pr_warn("unblank_screen: tty %d not allocated ??\n",
3884 fg_console + 1);
1da177e4
LT		 3885 return;
3886 }
3887 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3888 /* Try to unblank in oops case too */
3889 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3890 return; /* but leave console_blanked != 0 */
3891
3892 if (blankinterval) {
f324edc8 3893 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3894 blank_state = blank_normal_wait;
3895 }
3896
3897 console_blanked = 0;
8fd4bd22 3898 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3899 /* Low-level driver cannot restore -> do it ourselves */
3900 update_screen(vc);
3901 if (console_blank_hook)
3902 console_blank_hook(0);
3903 set_palette(vc);
3904 set_cursor(vc);
8b92e87d 3905 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3906}
3907EXPORT_SYMBOL(do_unblank_screen);
3908
3909/*
3910 * This is called by the outside world to cause a forced unblank, mostly for
3911 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3912 * call it with 1 as an argument and so force a mode restore... that may kill
3913 * X or at least garbage the screen but would also make the Oops visible...
3914 */
3915void unblank_screen(void)
3916{
3917 do_unblank_screen(0);
3918}
3919
3920/*
70522e12 3921 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3922 * (console operations can still happen at irq time, but only from printk which
70522e12 3923 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3924 */
3925static void blank_screen_t(unsigned long dummy)
3926{
cc63b1e1 3927 if (unlikely(!keventd_up())) {
f324edc8 3928 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3929 return;
3930 }
1da177e4
LT		 3931 blank_timer_expired = 1;
3932 schedule_work(&console_work);
3933}
3934
3935void poke_blanked_console(void)
3936{
3937 WARN_CONSOLE_UNLOCKED();
3938
3939 /* Add this so we quickly catch whoever might call us in a non
3940 * safe context. Nowadays, unblank_screen() isn't to be called in
3941 * atomic contexts and is allowed to schedule (with the special case
3942 * of oops_in_progress, but that isn't of any concern for this
3943 * function. --BenH.
3944 */
3945 might_sleep();
3946
3947 /* This isn't perfectly race free, but a race here would be mostly harmless,
3948 * at worse, we'll do a spurrious blank and it's unlikely
3949 */
3950 del_timer(&console_timer);
3951 blank_timer_expired = 0;
3952
3953 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3954 return;
3955 if (console_blanked)
3956 unblank_screen();
3957 else if (blankinterval) {
f324edc8 3958 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3959 blank_state = blank_normal_wait;
3960 }
3961}
3962
3963/*
3964 * Palettes
3965 */
3966
3967static void set_palette(struct vc_data *vc)
3968{
3969 WARN_CONSOLE_UNLOCKED();
3970
709280da 3971 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
1da177e4
LT		 3972 vc->vc_sw->con_set_palette(vc, color_table);
3973}
3974
1da177e4
LT		 3975/*
3976 * Load palette into the DAC registers. arg points to a colour
3977 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3978 */
3979
3980int con_set_cmap(unsigned char __user *arg)
3981{
871bdea6
MG		 3982 int i, j, k;
3983 unsigned char colormap[3*16];
3984
3985 if (copy_from_user(colormap, arg, sizeof(colormap)))
3986 return -EFAULT;
1da177e4 3987
ac751efa 3988 console_lock();
871bdea6
MG		 3989 for (i = k = 0; i < 16; i++) {
3990 default_red[i] = colormap[k++];
3991 default_grn[i] = colormap[k++];
3992 default_blu[i] = colormap[k++];
3993 }
3994 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3995 if (!vc_cons_allocated(i))
3996 continue;
3997 for (j = k = 0; j < 16; j++) {
3998 vc_cons[i].d->vc_palette[k++] = default_red[j];
3999 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4000 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4001 }
4002 set_palette(vc_cons[i].d);
4003 }
ac751efa 4004 console_unlock();
1da177e4 4005
871bdea6 4006 return 0;
1da177e4
LT		 4007}
4008
4009int con_get_cmap(unsigned char __user *arg)
4010{
871bdea6
MG		 4011 int i, k;
4012 unsigned char colormap[3*16];
1da177e4 4013
ac751efa 4014 console_lock();
871bdea6
MG		 4015 for (i = k = 0; i < 16; i++) {
4016 colormap[k++] = default_red[i];
4017 colormap[k++] = default_grn[i];
4018 colormap[k++] = default_blu[i];
4019 }
ac751efa 4020 console_unlock();
1da177e4 4021
871bdea6
MG		 4022 if (copy_to_user(arg, colormap, sizeof(colormap)))
4023 return -EFAULT;
4024
4025 return 0;
1da177e4
LT		 4026}
4027
4028void reset_palette(struct vc_data *vc)
4029{
4030 int j, k;
4031 for (j=k=0; j<16; j++) {
4032 vc->vc_palette[k++] = default_red[j];
4033 vc->vc_palette[k++] = default_grn[j];
4034 vc->vc_palette[k++] = default_blu[j];
4035 }
4036 set_palette(vc);
4037}
4038
4039/*
4040 * Font switching
4041 *
4042 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4043 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4044 * depending on width) reserved for each character which is kinda wasty, but
4045 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4046 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4047 * format (maybe we should add a `fontoffset' field to the `display'
4048 * structure so we won't have to convert the fontdata all the time.
4049 * /Jes
4050 */
4051
4052#define max_font_size 65536
4053
4054static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4055{
4056 struct console_font font;
4057 int rc = -EINVAL;
4058 int c;
4059
1da177e4
LT		 4060 if (op->data) {
4061 font.data = kmalloc(max_font_size, GFP_KERNEL);
4062 if (!font.data)
4063 return -ENOMEM;
4064 } else
4065 font.data = NULL;
4066
ac751efa 4067 console_lock();
edab558f
AC		 4068 if (vc->vc_mode != KD_TEXT)
4069 rc = -EINVAL;
4070 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4071 rc = vc->vc_sw->con_font_get(vc, &font);
4072 else
4073 rc = -ENOSYS;
ac751efa 4074 console_unlock();
1da177e4
LT		 4075
4076 if (rc)
4077 goto out;
4078
4079 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4080
1da177e4
LT		 4081 if (op->data && font.charcount > op->charcount)
4082 rc = -ENOSPC;
4083 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4084 if (font.width > op->width || font.height > op->height)
4085 rc = -ENOSPC;
4086 } else {
4087 if (font.width != 8)
4088 rc = -EIO;
4089 else if ((op->height && font.height > op->height) ||
4090 font.height > 32)
4091 rc = -ENOSPC;
4092 }
4093 if (rc)
4094 goto out;
4095
4096 op->height = font.height;
4097 op->width = font.width;
4098 op->charcount = font.charcount;
4099
4100 if (op->data && copy_to_user(op->data, font.data, c))
4101 rc = -EFAULT;
4102
4103out:
4104 kfree(font.data);
4105 return rc;
4106}
4107
4108static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4109{
4110 struct console_font font;
4111 int rc = -EINVAL;
4112 int size;
4113
4114 if (vc->vc_mode != KD_TEXT)
4115 return -EINVAL;
4116 if (!op->data)
4117 return -EINVAL;
4118 if (op->charcount > 512)
4119 return -EINVAL;
4120 if (!op->height) { /* Need to guess font height [compat] */
4121 int h, i;
4122 u8 __user *charmap = op->data;
4123 u8 tmp;
4124
4125 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4126 so that we can get rid of this soon */
4127 if (!(op->flags & KD_FONT_FLAG_OLD))
4128 return -EINVAL;
4129 for (h = 32; h > 0; h--)
4130 for (i = 0; i < op->charcount; i++) {
4131 if (get_user(tmp, &charmap[32*i+h-1]))
4132 return -EFAULT;
4133 if (tmp)
4134 goto nonzero;
4135 }
4136 return -EINVAL;
4137 nonzero:
4138 op->height = h;
4139 }
4140 if (op->width <= 0 || op->width > 32 || op->height > 32)
4141 return -EINVAL;
4142 size = (op->width+7)/8 * 32 * op->charcount;
4143 if (size > max_font_size)
4144 return -ENOSPC;
4145 font.charcount = op->charcount;
4146 font.height = op->height;
4147 font.width = op->width;
9b71ca20
JL		 4148 font.data = memdup_user(op->data, size);
4149 if (IS_ERR(font.data))
4150 return PTR_ERR(font.data);
ac751efa 4151 console_lock();
edab558f
AC		 4152 if (vc->vc_mode != KD_TEXT)
4153 rc = -EINVAL;
4154 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4155 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4156 else
4157 rc = -ENOSYS;
ac751efa 4158 console_unlock();
1da177e4
LT		 4159 kfree(font.data);
4160 return rc;
4161}
4162
4163static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4164{
4165 struct console_font font = {.width = op->width, .height = op->height};
4166 char name[MAX_FONT_NAME];
4167 char *s = name;
4168 int rc;
4169
1da177e4
LT		 4170
4171 if (!op->data)
4172 s = NULL;
4173 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4174 return -EFAULT;
4175 else
4176 name[MAX_FONT_NAME - 1] = 0;
4177
ac751efa 4178 console_lock();
edab558f
AC		 4179 if (vc->vc_mode != KD_TEXT) {
4180 console_unlock();
4181 return -EINVAL;
4182 }
1da177e4
LT		 4183 if (vc->vc_sw->con_font_default)
4184 rc = vc->vc_sw->con_font_default(vc, &font, s);
4185 else
4186 rc = -ENOSYS;
ac751efa 4187 console_unlock();
1da177e4
LT		 4188 if (!rc) {
4189 op->width = font.width;
4190 op->height = font.height;
4191 }
4192 return rc;
4193}
4194
4195static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4196{
4197 int con = op->height;
4198 int rc;
4199
1da177e4 4200
ac751efa 4201 console_lock();
edab558f
AC		 4202 if (vc->vc_mode != KD_TEXT)
4203 rc = -EINVAL;
4204 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4205 rc = -ENOSYS;
4206 else if (con < 0 || !vc_cons_allocated(con))
4207 rc = -ENOTTY;
4208 else if (con == vc->vc_num) /* nothing to do */
4209 rc = 0;
4210 else
4211 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4212 console_unlock();
1da177e4
LT		 4213 return rc;
4214}
4215
4216int con_font_op(struct vc_data *vc, struct console_font_op *op)
4217{
4218 switch (op->op) {
4219 case KD_FONT_OP_SET:
4220 return con_font_set(vc, op);
4221 case KD_FONT_OP_GET:
4222 return con_font_get(vc, op);
4223 case KD_FONT_OP_SET_DEFAULT:
4224 return con_font_default(vc, op);
4225 case KD_FONT_OP_COPY:
4226 return con_font_copy(vc, op);
4227 }
4228 return -ENOSYS;
4229}
4230
4231/*
4232 * Interface exported to selection and vcs.
4233 */
4234
4235/* used by selection */
4236u16 screen_glyph(struct vc_data *vc, int offset)
4237{
4238 u16 w = scr_readw(screenpos(vc, offset, 1));
4239 u16 c = w & 0xff;
4240
4241 if (w & vc->vc_hi_font_mask)
4242 c |= 0x100;
4243 return c;
4244}
f7511d5f 4245EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4246
4247/* used by vcs - note the word offset */
4248unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4249{
4250 return screenpos(vc, 2 * w_offset, viewed);
4251}
88867e3d 4252EXPORT_SYMBOL_GPL(screen_pos);
1da177e4
LT		 4253
4254void getconsxy(struct vc_data *vc, unsigned char *p)
4255{
4256 p[0] = vc->vc_x;
4257 p[1] = vc->vc_y;
4258}
4259
4260void putconsxy(struct vc_data *vc, unsigned char *p)
4261{
9477e260 4262 hide_cursor(vc);
1da177e4
LT		 4263 gotoxy(vc, p[0], p[1]);
4264 set_cursor(vc);
4265}
4266
4267u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4268{
4269 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4270 return softcursor_original;
4271 return scr_readw(org);
4272}
4273
4274void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4275{
4276 scr_writew(val, org);
4277 if ((unsigned long)org == vc->vc_pos) {
4278 softcursor_original = -1;
4279 add_softcursor(vc);
4280 }
4281}
4282
432c9ed2
NP		 4283void vcs_scr_updated(struct vc_data *vc)
4284{
4285 notify_update(vc);
4286}
4287
1da177e4
LT		 4288/*
4289 * Visible symbols for modules
4290 */
4291
4292EXPORT_SYMBOL(color_table);
4293EXPORT_SYMBOL(default_red);
4294EXPORT_SYMBOL(default_grn);
4295EXPORT_SYMBOL(default_blu);
4296EXPORT_SYMBOL(update_region);
4297EXPORT_SYMBOL(redraw_screen);
4298EXPORT_SYMBOL(vc_resize);
4299EXPORT_SYMBOL(fg_console);
4300EXPORT_SYMBOL(console_blank_hook);
4301EXPORT_SYMBOL(console_blanked);
4302EXPORT_SYMBOL(vc_cons);
f6c06b68 4303EXPORT_SYMBOL(global_cursor_default);
1da177e4 4304#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4305EXPORT_SYMBOL(give_up_console);
4306#endif
Linux 6.x block layer and io_uring tree(s)