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mfd: wm8350-i2c: Make sure the i2c regmap functions are compiled
[linux/fpc-iii.git] / drivers / tty / vt / vt.c
blob19aba50914085d98e2f74769b6f9e9ab83038911
1 /*
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
60 * deletion SMP-safe. 17Jun00, Andrew Morton
61 *
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
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
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>
87 #include <linux/mutex.h>
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>
95 #include <linux/workqueue.h>
96 #include <linux/pm.h>
97 #include <linux/font.h>
98 #include <linux/bitops.h>
99 #include <linux/notifier.h>
100 #include <linux/device.h>
101 #include <linux/io.h>
102 #include <linux/uaccess.h>
103 #include <linux/kdb.h>
104 #include <linux/ctype.h>
105
106 #define MAX_NR_CON_DRIVER 16
107
108 #define CON_DRIVER_FLAG_MODULE 1
109 #define CON_DRIVER_FLAG_INIT 2
110 #define CON_DRIVER_FLAG_ATTR 4
111
112 struct con_driver {
113 const struct consw *con;
114 const char *desc;
115 struct device *dev;
116 int node;
117 int first;
118 int last;
119 int flag;
120 };
121
122 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
123 const struct consw *conswitchp;
124
125 /* A bitmap for codes <32. A bit of 1 indicates that the code
126 * corresponding to that bit number invokes some special action
127 * (such as cursor movement) and should not be displayed as a
128 * glyph unless the disp_ctrl mode is explicitly enabled.
129 */
130 #define CTRL_ACTION 0x0d00ff81
131 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
132
133 /*
134 * Here is the default bell parameters: 750HZ, 1/8th of a second
135 */
136 #define DEFAULT_BELL_PITCH 750
137 #define DEFAULT_BELL_DURATION (HZ/8)
138
139 struct vc vc_cons [MAX_NR_CONSOLES];
140
141 #ifndef VT_SINGLE_DRIVER
142 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
143 #endif
144
145 static int con_open(struct tty_struct *, struct file *);
146 static void vc_init(struct vc_data *vc, unsigned int rows,
147 unsigned int cols, int do_clear);
148 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
149 static void save_cur(struct vc_data *vc);
150 static void reset_terminal(struct vc_data *vc, int do_clear);
151 static void con_flush_chars(struct tty_struct *tty);
152 static int set_vesa_blanking(char __user *p);
153 static void set_cursor(struct vc_data *vc);
154 static void hide_cursor(struct vc_data *vc);
155 static void console_callback(struct work_struct *ignored);
156 static void blank_screen_t(unsigned long dummy);
157 static void set_palette(struct vc_data *vc);
158
159 static int printable; /* Is console ready for printing? */
160 int default_utf8 = true;
161 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
162 int global_cursor_default = -1;
163 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
164
165 static int cur_default = CUR_DEFAULT;
166 module_param(cur_default, int, S_IRUGO | S_IWUSR);
167
168 /*
169 * ignore_poke: don't unblank the screen when things are typed. This is
170 * mainly for the privacy of braille terminal users.
171 */
172 static int ignore_poke;
173
174 int do_poke_blanked_console;
175 int console_blanked;
176
177 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
178 static int vesa_off_interval;
179 static int blankinterval = 10*60;
180 core_param(consoleblank, blankinterval, int, 0444);
181
182 static DECLARE_WORK(console_work, console_callback);
183
184 /*
185 * fg_console is the current virtual console,
186 * last_console is the last used one,
187 * want_console is the console we want to switch to,
188 * saved_* variants are for save/restore around kernel debugger enter/leave
189 */
190 int fg_console;
191 int last_console;
192 int want_console = -1;
193 static int saved_fg_console;
194 static int saved_last_console;
195 static int saved_want_console;
196 static int saved_vc_mode;
197 static int saved_console_blanked;
198
199 /*
200 * For each existing display, we have a pointer to console currently visible
201 * on that display, allowing consoles other than fg_console to be refreshed
202 * appropriately. Unless the low-level driver supplies its own display_fg
203 * variable, we use this one for the "master display".
204 */
205 static struct vc_data *master_display_fg;
206
207 /*
208 * Unfortunately, we need to delay tty echo when we're currently writing to the
209 * console since the code is (and always was) not re-entrant, so we schedule
210 * all flip requests to process context with schedule-task() and run it from
211 * console_callback().
212 */
213
214 /*
215 * For the same reason, we defer scrollback to the console callback.
216 */
217 static int scrollback_delta;
218
219 /*
220 * Hook so that the power management routines can (un)blank
221 * the console on our behalf.
222 */
223 int (*console_blank_hook)(int);
224
225 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
226 static int blank_state;
227 static int blank_timer_expired;
228 enum {
229 blank_off = 0,
230 blank_normal_wait,
231 blank_vesa_wait,
232 };
233
234 /*
235 * /sys/class/tty/tty0/
236 *
237 * the attribute 'active' contains the name of the current vc
238 * console and it supports poll() to detect vc switches
239 */
240 static struct device *tty0dev;
241
242 /*
243 * Notifier list for console events.
244 */
245 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
246
247 int register_vt_notifier(struct notifier_block *nb)
248 {
249 return atomic_notifier_chain_register(&vt_notifier_list, nb);
250 }
251 EXPORT_SYMBOL_GPL(register_vt_notifier);
252
253 int unregister_vt_notifier(struct notifier_block *nb)
254 {
255 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
256 }
257 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
258
259 static void notify_write(struct vc_data *vc, unsigned int unicode)
260 {
261 struct vt_notifier_param param = { .vc = vc, .c = unicode };
262 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
263 }
264
265 static void notify_update(struct vc_data *vc)
266 {
267 struct vt_notifier_param param = { .vc = vc };
268 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
269 }
270 /*
271 * Low-Level Functions
272 */
273
274 #define IS_FG(vc) ((vc)->vc_num == fg_console)
275
276 #ifdef VT_BUF_VRAM_ONLY
277 #define DO_UPDATE(vc) 0
278 #else
279 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
280 #endif
281
282 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
283 {
284 unsigned short *p;
285
286 if (!viewed)
287 p = (unsigned short *)(vc->vc_origin + offset);
288 else if (!vc->vc_sw->con_screen_pos)
289 p = (unsigned short *)(vc->vc_visible_origin + offset);
290 else
291 p = vc->vc_sw->con_screen_pos(vc, offset);
292 return p;
293 }
294
295 /* Called from the keyboard irq path.. */
296 static inline void scrolldelta(int lines)
297 {
298 /* FIXME */
299 /* scrolldelta needs some kind of consistency lock, but the BKL was
300 and still is not protecting versus the scheduled back end */
301 scrollback_delta += lines;
302 schedule_console_callback();
303 }
304
305 void schedule_console_callback(void)
306 {
307 schedule_work(&console_work);
308 }
309
310 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
311 {
312 unsigned short *d, *s;
313
314 if (t+nr >= b)
315 nr = b - t - 1;
316 if (b > vc->vc_rows || t >= b || nr < 1)
317 return;
318 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
319 return;
320 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
321 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
322 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
323 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
324 vc->vc_size_row * nr);
325 }
326
327 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
328 {
329 unsigned short *s;
330 unsigned int step;
331
332 if (t+nr >= b)
333 nr = b - t - 1;
334 if (b > vc->vc_rows || t >= b || nr < 1)
335 return;
336 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
337 return;
338 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
339 step = vc->vc_cols * nr;
340 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
341 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
342 }
343
344 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
345 {
346 #ifndef VT_BUF_VRAM_ONLY
347 unsigned int xx, yy, offset;
348 u16 *p;
349
350 p = (u16 *) start;
351 if (!vc->vc_sw->con_getxy) {
352 offset = (start - vc->vc_origin) / 2;
353 xx = offset % vc->vc_cols;
354 yy = offset / vc->vc_cols;
355 } else {
356 int nxx, nyy;
357 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
358 xx = nxx; yy = nyy;
359 }
360 for(;;) {
361 u16 attrib = scr_readw(p) & 0xff00;
362 int startx = xx;
363 u16 *q = p;
364 while (xx < vc->vc_cols && count) {
365 if (attrib != (scr_readw(p) & 0xff00)) {
366 if (p > q)
367 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
368 startx = xx;
369 q = p;
370 attrib = scr_readw(p) & 0xff00;
371 }
372 p++;
373 xx++;
374 count--;
375 }
376 if (p > q)
377 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
378 if (!count)
379 break;
380 xx = 0;
381 yy++;
382 if (vc->vc_sw->con_getxy) {
383 p = (u16 *)start;
384 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
385 }
386 }
387 #endif
388 }
389
390 void update_region(struct vc_data *vc, unsigned long start, int count)
391 {
392 WARN_CONSOLE_UNLOCKED();
393
394 if (DO_UPDATE(vc)) {
395 hide_cursor(vc);
396 do_update_region(vc, start, count);
397 set_cursor(vc);
398 }
399 }
400
401 /* Structure of attributes is hardware-dependent */
402
403 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
404 u8 _underline, u8 _reverse, u8 _italic)
405 {
406 if (vc->vc_sw->con_build_attr)
407 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
408 _blink, _underline, _reverse, _italic);
409
410 #ifndef VT_BUF_VRAM_ONLY
411 /*
412 * ++roman: I completely changed the attribute format for monochrome
413 * mode (!can_do_color). The formerly used MDA (monochrome display
414 * adapter) format didn't allow the combination of certain effects.
415 * Now the attribute is just a bit vector:
416 * Bit 0..1: intensity (0..2)
417 * Bit 2 : underline
418 * Bit 3 : reverse
419 * Bit 7 : blink
420 */
421 {
422 u8 a = _color;
423 if (!vc->vc_can_do_color)
424 return _intensity |
425 (_italic ? 2 : 0) |
426 (_underline ? 4 : 0) |
427 (_reverse ? 8 : 0) |
428 (_blink ? 0x80 : 0);
429 if (_italic)
430 a = (a & 0xF0) | vc->vc_itcolor;
431 else if (_underline)
432 a = (a & 0xf0) | vc->vc_ulcolor;
433 else if (_intensity == 0)
434 a = (a & 0xf0) | vc->vc_ulcolor;
435 if (_reverse)
436 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
437 if (_blink)
438 a ^= 0x80;
439 if (_intensity == 2)
440 a ^= 0x08;
441 if (vc->vc_hi_font_mask == 0x100)
442 a <<= 1;
443 return a;
444 }
445 #else
446 return 0;
447 #endif
448 }
449
450 static void update_attr(struct vc_data *vc)
451 {
452 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
453 vc->vc_blink, vc->vc_underline,
454 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
455 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
456 }
457
458 /* Note: inverting the screen twice should revert to the original state */
459 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
460 {
461 unsigned short *p;
462
463 WARN_CONSOLE_UNLOCKED();
464
465 count /= 2;
466 p = screenpos(vc, offset, viewed);
467 if (vc->vc_sw->con_invert_region)
468 vc->vc_sw->con_invert_region(vc, p, count);
469 #ifndef VT_BUF_VRAM_ONLY
470 else {
471 u16 *q = p;
472 int cnt = count;
473 u16 a;
474
475 if (!vc->vc_can_do_color) {
476 while (cnt--) {
477 a = scr_readw(q);
478 a ^= 0x0800;
479 scr_writew(a, q);
480 q++;
481 }
482 } else if (vc->vc_hi_font_mask == 0x100) {
483 while (cnt--) {
484 a = scr_readw(q);
485 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
486 scr_writew(a, q);
487 q++;
488 }
489 } else {
490 while (cnt--) {
491 a = scr_readw(q);
492 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
493 scr_writew(a, q);
494 q++;
495 }
496 }
497 }
498 #endif
499 if (DO_UPDATE(vc))
500 do_update_region(vc, (unsigned long) p, count);
501 notify_update(vc);
502 }
503
504 /* used by selection: complement pointer position */
505 void complement_pos(struct vc_data *vc, int offset)
506 {
507 static int old_offset = -1;
508 static unsigned short old;
509 static unsigned short oldx, oldy;
510
511 WARN_CONSOLE_UNLOCKED();
512
513 if (old_offset != -1 && old_offset >= 0 &&
514 old_offset < vc->vc_screenbuf_size) {
515 scr_writew(old, screenpos(vc, old_offset, 1));
516 if (DO_UPDATE(vc))
517 vc->vc_sw->con_putc(vc, old, oldy, oldx);
518 notify_update(vc);
519 }
520
521 old_offset = offset;
522
523 if (offset != -1 && offset >= 0 &&
524 offset < vc->vc_screenbuf_size) {
525 unsigned short new;
526 unsigned short *p;
527 p = screenpos(vc, offset, 1);
528 old = scr_readw(p);
529 new = old ^ vc->vc_complement_mask;
530 scr_writew(new, p);
531 if (DO_UPDATE(vc)) {
532 oldx = (offset >> 1) % vc->vc_cols;
533 oldy = (offset >> 1) / vc->vc_cols;
534 vc->vc_sw->con_putc(vc, new, oldy, oldx);
535 }
536 notify_update(vc);
537 }
538 }
539
540 static void insert_char(struct vc_data *vc, unsigned int nr)
541 {
542 unsigned short *p = (unsigned short *) vc->vc_pos;
543
544 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
545 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
546 vc->vc_need_wrap = 0;
547 if (DO_UPDATE(vc))
548 do_update_region(vc, (unsigned long) p,
549 vc->vc_cols - vc->vc_x);
550 }
551
552 static void delete_char(struct vc_data *vc, unsigned int nr)
553 {
554 unsigned short *p = (unsigned short *) vc->vc_pos;
555
556 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
557 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
558 nr * 2);
559 vc->vc_need_wrap = 0;
560 if (DO_UPDATE(vc))
561 do_update_region(vc, (unsigned long) p,
562 vc->vc_cols - vc->vc_x);
563 }
564
565 static int softcursor_original;
566
567 static void add_softcursor(struct vc_data *vc)
568 {
569 int i = scr_readw((u16 *) vc->vc_pos);
570 u32 type = vc->vc_cursor_type;
571
572 if (! (type & 0x10)) return;
573 if (softcursor_original != -1) return;
574 softcursor_original = i;
575 i |= ((type >> 8) & 0xff00 );
576 i ^= ((type) & 0xff00 );
577 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
578 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
579 scr_writew(i, (u16 *) vc->vc_pos);
580 if (DO_UPDATE(vc))
581 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
582 }
583
584 static void hide_softcursor(struct vc_data *vc)
585 {
586 if (softcursor_original != -1) {
587 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
588 if (DO_UPDATE(vc))
589 vc->vc_sw->con_putc(vc, softcursor_original,
590 vc->vc_y, vc->vc_x);
591 softcursor_original = -1;
592 }
593 }
594
595 static void hide_cursor(struct vc_data *vc)
596 {
597 if (vc == sel_cons)
598 clear_selection();
599 vc->vc_sw->con_cursor(vc, CM_ERASE);
600 hide_softcursor(vc);
601 }
602
603 static void set_cursor(struct vc_data *vc)
604 {
605 if (!IS_FG(vc) || console_blanked ||
606 vc->vc_mode == KD_GRAPHICS)
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
618 static void set_origin(struct vc_data *vc)
619 {
620 WARN_CONSOLE_UNLOCKED();
621
622 if (!CON_IS_VISIBLE(vc) ||
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
631 static inline void save_screen(struct vc_data *vc)
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
643 void clear_buffer_attributes(struct vc_data *vc)
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
654 void 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;
670 if (!CON_IS_VISIBLE(vc))
671 redraw = 1;
672 *vc->vc_display_fg = vc;
673 fg_console = vc->vc_num;
674 hide_cursor(old_vc);
675 if (!CON_IS_VISIBLE(old_vc)) {
676 save_screen(old_vc);
677 set_origin(old_vc);
678 }
679 if (tty0dev)
680 sysfs_notify(&tty0dev->kobj, NULL, "active");
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 }
703
704 /* Forcibly update if we're panicing */
705 if ((update && vc->vc_mode != KD_GRAPHICS) ||
706 vt_force_oops_output(vc))
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();
713 notify_update(vc);
714 }
715 }
716
717 /*
718 * Allocation, freeing and resizing of VTs.
719 */
720
721 int vc_cons_allocated(unsigned int i)
722 {
723 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
724 }
725
726 static 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;
739 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
740 vc->vc_uni_pagedir = 0;
741 vc->vc_hi_font_mask = 0;
742 vc->vc_complement_mask = 0;
743 vc->vc_can_do_color = 0;
744 vc->vc_panic_force_write = false;
745 vc->vc_sw->con_init(vc, init);
746 if (!vc->vc_complement_mask)
747 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
748 vc->vc_s_complement_mask = vc->vc_complement_mask;
749 vc->vc_size_row = vc->vc_cols << 1;
750 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
751 }
752
753 int vc_allocate(unsigned int currcons) /* return 0 on success */
754 {
755 WARN_CONSOLE_UNLOCKED();
756
757 if (currcons >= MAX_NR_CONSOLES)
758 return -ENXIO;
759 if (!vc_cons[currcons].d) {
760 struct vc_data *vc;
761 struct vt_notifier_param param;
762
763 /* prevent users from taking too much memory */
764 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
765 return -EPERM;
766
767 /* due to the granularity of kmalloc, we waste some memory here */
768 /* the alloc is done in two steps, to optimize the common situation
769 of a 25x80 console (structsize=216, screenbuf_size=4000) */
770 /* although the numbers above are not valid since long ago, the
771 point is still up-to-date and the comment still has its value
772 even if only as a historical artifact. --mj, July 1998 */
773 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
774 if (!vc)
775 return -ENOMEM;
776 vc_cons[currcons].d = vc;
777 tty_port_init(&vc->port);
778 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
779 visual_init(vc, currcons, 1);
780 if (!*vc->vc_uni_pagedir_loc)
781 con_set_default_unimap(vc);
782 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
783 if (!vc->vc_screenbuf) {
784 kfree(vc);
785 vc_cons[currcons].d = NULL;
786 return -ENOMEM;
787 }
788
789 /* If no drivers have overridden us and the user didn't pass a
790 boot option, default to displaying the cursor */
791 if (global_cursor_default == -1)
792 global_cursor_default = 1;
793
794 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
795 vcs_make_sysfs(currcons);
796 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
797 }
798 return 0;
799 }
800
801 static inline int resize_screen(struct vc_data *vc, int width, int height,
802 int user)
803 {
804 /* Resizes the resolution of the display adapater */
805 int err = 0;
806
807 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
808 err = vc->vc_sw->con_resize(vc, width, height, user);
809
810 return err;
811 }
812
813 /*
814 * Change # of rows and columns (0 means unchanged/the size of fg_console)
815 * [this is to be used together with some user program
816 * like resize that changes the hardware videomode]
817 */
818 #define VC_RESIZE_MAXCOL (32767)
819 #define VC_RESIZE_MAXROW (32767)
820
821 /**
822 * vc_do_resize - resizing method for the tty
823 * @tty: tty being resized
824 * @real_tty: real tty (different to tty if a pty/tty pair)
825 * @vc: virtual console private data
826 * @cols: columns
827 * @lines: lines
828 *
829 * Resize a virtual console, clipping according to the actual constraints.
830 * If the caller passes a tty structure then update the termios winsize
831 * information and perform any necessary signal handling.
832 *
833 * Caller must hold the console semaphore. Takes the termios rwsem and
834 * ctrl_lock of the tty IFF a tty is passed.
835 */
836
837 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
838 unsigned int cols, unsigned int lines)
839 {
840 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
841 unsigned long end;
842 unsigned int old_rows, old_row_size;
843 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
844 unsigned int user;
845 unsigned short *newscreen;
846
847 WARN_CONSOLE_UNLOCKED();
848
849 if (!vc)
850 return -ENXIO;
851
852 user = vc->vc_resize_user;
853 vc->vc_resize_user = 0;
854
855 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
856 return -EINVAL;
857
858 new_cols = (cols ? cols : vc->vc_cols);
859 new_rows = (lines ? lines : vc->vc_rows);
860 new_row_size = new_cols << 1;
861 new_screen_size = new_row_size * new_rows;
862
863 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
864 return 0;
865
866 newscreen = kmalloc(new_screen_size, GFP_USER);
867 if (!newscreen)
868 return -ENOMEM;
869
870 old_rows = vc->vc_rows;
871 old_row_size = vc->vc_size_row;
872
873 err = resize_screen(vc, new_cols, new_rows, user);
874 if (err) {
875 kfree(newscreen);
876 return err;
877 }
878
879 vc->vc_rows = new_rows;
880 vc->vc_cols = new_cols;
881 vc->vc_size_row = new_row_size;
882 vc->vc_screenbuf_size = new_screen_size;
883
884 rlth = min(old_row_size, new_row_size);
885 rrem = new_row_size - rlth;
886 old_origin = vc->vc_origin;
887 new_origin = (long) newscreen;
888 new_scr_end = new_origin + new_screen_size;
889
890 if (vc->vc_y > new_rows) {
891 if (old_rows - vc->vc_y < new_rows) {
892 /*
893 * Cursor near the bottom, copy contents from the
894 * bottom of buffer
895 */
896 old_origin += (old_rows - new_rows) * old_row_size;
897 } else {
898 /*
899 * Cursor is in no man's land, copy 1/2 screenful
900 * from the top and bottom of cursor position
901 */
902 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
903 }
904 }
905
906 end = old_origin + old_row_size * min(old_rows, new_rows);
907
908 update_attr(vc);
909
910 while (old_origin < end) {
911 scr_memcpyw((unsigned short *) new_origin,
912 (unsigned short *) old_origin, rlth);
913 if (rrem)
914 scr_memsetw((void *)(new_origin + rlth),
915 vc->vc_video_erase_char, rrem);
916 old_origin += old_row_size;
917 new_origin += new_row_size;
918 }
919 if (new_scr_end > new_origin)
920 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
921 new_scr_end - new_origin);
922 kfree(vc->vc_screenbuf);
923 vc->vc_screenbuf = newscreen;
924 vc->vc_screenbuf_size = new_screen_size;
925 set_origin(vc);
926
927 /* do part of a reset_terminal() */
928 vc->vc_top = 0;
929 vc->vc_bottom = vc->vc_rows;
930 gotoxy(vc, vc->vc_x, vc->vc_y);
931 save_cur(vc);
932
933 if (tty) {
934 /* Rewrite the requested winsize data with the actual
935 resulting sizes */
936 struct winsize ws;
937 memset(&ws, 0, sizeof(ws));
938 ws.ws_row = vc->vc_rows;
939 ws.ws_col = vc->vc_cols;
940 ws.ws_ypixel = vc->vc_scan_lines;
941 tty_do_resize(tty, &ws);
942 }
943
944 if (CON_IS_VISIBLE(vc))
945 update_screen(vc);
946 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
947 return err;
948 }
949
950 /**
951 * vc_resize - resize a VT
952 * @vc: virtual console
953 * @cols: columns
954 * @rows: rows
955 *
956 * Resize a virtual console as seen from the console end of things. We
957 * use the common vc_do_resize methods to update the structures. The
958 * caller must hold the console sem to protect console internals and
959 * vc->port.tty
960 */
961
962 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
963 {
964 return vc_do_resize(vc->port.tty, vc, cols, rows);
965 }
966
967 /**
968 * vt_resize - resize a VT
969 * @tty: tty to resize
970 * @ws: winsize attributes
971 *
972 * Resize a virtual terminal. This is called by the tty layer as we
973 * register our own handler for resizing. The mutual helper does all
974 * the actual work.
975 *
976 * Takes the console sem and the called methods then take the tty
977 * termios_rwsem and the tty ctrl_lock in that order.
978 */
979 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
980 {
981 struct vc_data *vc = tty->driver_data;
982 int ret;
983
984 console_lock();
985 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
986 console_unlock();
987 return ret;
988 }
989
990 struct vc_data *vc_deallocate(unsigned int currcons)
991 {
992 struct vc_data *vc = NULL;
993
994 WARN_CONSOLE_UNLOCKED();
995
996 if (vc_cons_allocated(currcons)) {
997 struct vt_notifier_param param;
998
999 param.vc = vc = vc_cons[currcons].d;
1000 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1001 vcs_remove_sysfs(currcons);
1002 vc->vc_sw->con_deinit(vc);
1003 put_pid(vc->vt_pid);
1004 module_put(vc->vc_sw->owner);
1005 kfree(vc->vc_screenbuf);
1006 vc_cons[currcons].d = NULL;
1007 }
1008 return vc;
1009 }
1010
1011 /*
1012 * VT102 emulator
1013 */
1014
1015 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1016 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1017 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1018
1019 #define decarm VC_REPEAT
1020 #define decckm VC_CKMODE
1021 #define kbdapplic VC_APPLIC
1022 #define lnm VC_CRLF
1023
1024 /*
1025 * this is what the terminal answers to a ESC-Z or csi0c query.
1026 */
1027 #define VT100ID "\033[?1;2c"
1028 #define VT102ID "\033[?6c"
1029
1030 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1031 8,12,10,14, 9,13,11,15 };
1032
1033 /* the default colour table, for VGA+ colour systems */
1034 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1035 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1036 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1037 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1038 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1039 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1040
1041 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1042 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1043 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1044
1045 /*
1046 * gotoxy() must verify all boundaries, because the arguments
1047 * might also be negative. If the given position is out of
1048 * bounds, the cursor is placed at the nearest margin.
1049 */
1050 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1051 {
1052 int min_y, max_y;
1053
1054 if (new_x < 0)
1055 vc->vc_x = 0;
1056 else {
1057 if (new_x >= vc->vc_cols)
1058 vc->vc_x = vc->vc_cols - 1;
1059 else
1060 vc->vc_x = new_x;
1061 }
1062
1063 if (vc->vc_decom) {
1064 min_y = vc->vc_top;
1065 max_y = vc->vc_bottom;
1066 } else {
1067 min_y = 0;
1068 max_y = vc->vc_rows;
1069 }
1070 if (new_y < min_y)
1071 vc->vc_y = min_y;
1072 else if (new_y >= max_y)
1073 vc->vc_y = max_y - 1;
1074 else
1075 vc->vc_y = new_y;
1076 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1077 vc->vc_need_wrap = 0;
1078 }
1079
1080 /* for absolute user moves, when decom is set */
1081 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1082 {
1083 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1084 }
1085
1086 void scrollback(struct vc_data *vc, int lines)
1087 {
1088 if (!lines)
1089 lines = vc->vc_rows / 2;
1090 scrolldelta(-lines);
1091 }
1092
1093 void scrollfront(struct vc_data *vc, int lines)
1094 {
1095 if (!lines)
1096 lines = vc->vc_rows / 2;
1097 scrolldelta(lines);
1098 }
1099
1100 static void lf(struct vc_data *vc)
1101 {
1102 /* don't scroll if above bottom of scrolling region, or
1103 * if below scrolling region
1104 */
1105 if (vc->vc_y + 1 == vc->vc_bottom)
1106 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1107 else if (vc->vc_y < vc->vc_rows - 1) {
1108 vc->vc_y++;
1109 vc->vc_pos += vc->vc_size_row;
1110 }
1111 vc->vc_need_wrap = 0;
1112 notify_write(vc, '\n');
1113 }
1114
1115 static void ri(struct vc_data *vc)
1116 {
1117 /* don't scroll if below top of scrolling region, or
1118 * if above scrolling region
1119 */
1120 if (vc->vc_y == vc->vc_top)
1121 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1122 else if (vc->vc_y > 0) {
1123 vc->vc_y--;
1124 vc->vc_pos -= vc->vc_size_row;
1125 }
1126 vc->vc_need_wrap = 0;
1127 }
1128
1129 static inline void cr(struct vc_data *vc)
1130 {
1131 vc->vc_pos -= vc->vc_x << 1;
1132 vc->vc_need_wrap = vc->vc_x = 0;
1133 notify_write(vc, '\r');
1134 }
1135
1136 static inline void bs(struct vc_data *vc)
1137 {
1138 if (vc->vc_x) {
1139 vc->vc_pos -= 2;
1140 vc->vc_x--;
1141 vc->vc_need_wrap = 0;
1142 notify_write(vc, '\b');
1143 }
1144 }
1145
1146 static inline void del(struct vc_data *vc)
1147 {
1148 /* ignored */
1149 }
1150
1151 static void csi_J(struct vc_data *vc, int vpar)
1152 {
1153 unsigned int count;
1154 unsigned short * start;
1155
1156 switch (vpar) {
1157 case 0: /* erase from cursor to end of display */
1158 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1159 start = (unsigned short *)vc->vc_pos;
1160 break;
1161 case 1: /* erase from start to cursor */
1162 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1163 start = (unsigned short *)vc->vc_origin;
1164 break;
1165 case 3: /* erase scroll-back buffer (and whole display) */
1166 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1167 vc->vc_screenbuf_size >> 1);
1168 set_origin(vc);
1169 if (CON_IS_VISIBLE(vc))
1170 update_screen(vc);
1171 /* fall through */
1172 case 2: /* erase whole display */
1173 count = vc->vc_cols * vc->vc_rows;
1174 start = (unsigned short *)vc->vc_origin;
1175 break;
1176 default:
1177 return;
1178 }
1179 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1180 if (DO_UPDATE(vc))
1181 do_update_region(vc, (unsigned long) start, count);
1182 vc->vc_need_wrap = 0;
1183 }
1184
1185 static void csi_K(struct vc_data *vc, int vpar)
1186 {
1187 unsigned int count;
1188 unsigned short * start;
1189
1190 switch (vpar) {
1191 case 0: /* erase from cursor to end of line */
1192 count = vc->vc_cols - vc->vc_x;
1193 start = (unsigned short *)vc->vc_pos;
1194 break;
1195 case 1: /* erase from start of line to cursor */
1196 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1197 count = vc->vc_x + 1;
1198 break;
1199 case 2: /* erase whole line */
1200 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1201 count = vc->vc_cols;
1202 break;
1203 default:
1204 return;
1205 }
1206 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1207 vc->vc_need_wrap = 0;
1208 if (DO_UPDATE(vc))
1209 do_update_region(vc, (unsigned long) start, count);
1210 }
1211
1212 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1213 { /* not vt100? */
1214 int count;
1215
1216 if (!vpar)
1217 vpar++;
1218 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1219
1220 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1221 if (DO_UPDATE(vc))
1222 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1223 vc->vc_need_wrap = 0;
1224 }
1225
1226 static void default_attr(struct vc_data *vc)
1227 {
1228 vc->vc_intensity = 1;
1229 vc->vc_italic = 0;
1230 vc->vc_underline = 0;
1231 vc->vc_reverse = 0;
1232 vc->vc_blink = 0;
1233 vc->vc_color = vc->vc_def_color;
1234 }
1235
1236 /* console_lock is held */
1237 static void csi_m(struct vc_data *vc)
1238 {
1239 int i;
1240
1241 for (i = 0; i <= vc->vc_npar; i++)
1242 switch (vc->vc_par[i]) {
1243 case 0: /* all attributes off */
1244 default_attr(vc);
1245 break;
1246 case 1:
1247 vc->vc_intensity = 2;
1248 break;
1249 case 2:
1250 vc->vc_intensity = 0;
1251 break;
1252 case 3:
1253 vc->vc_italic = 1;
1254 break;
1255 case 4:
1256 vc->vc_underline = 1;
1257 break;
1258 case 5:
1259 vc->vc_blink = 1;
1260 break;
1261 case 7:
1262 vc->vc_reverse = 1;
1263 break;
1264 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1265 * Select primary font, don't display
1266 * control chars if defined, don't set
1267 * bit 8 on output.
1268 */
1269 vc->vc_translate = set_translate(vc->vc_charset == 0
1270 ? vc->vc_G0_charset
1271 : vc->vc_G1_charset, vc);
1272 vc->vc_disp_ctrl = 0;
1273 vc->vc_toggle_meta = 0;
1274 break;
1275 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1276 * Select first alternate font, lets
1277 * chars < 32 be displayed as ROM chars.
1278 */
1279 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1280 vc->vc_disp_ctrl = 1;
1281 vc->vc_toggle_meta = 0;
1282 break;
1283 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1284 * Select second alternate font, toggle
1285 * high bit before displaying as ROM char.
1286 */
1287 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1288 vc->vc_disp_ctrl = 1;
1289 vc->vc_toggle_meta = 1;
1290 break;
1291 case 21:
1292 case 22:
1293 vc->vc_intensity = 1;
1294 break;
1295 case 23:
1296 vc->vc_italic = 0;
1297 break;
1298 case 24:
1299 vc->vc_underline = 0;
1300 break;
1301 case 25:
1302 vc->vc_blink = 0;
1303 break;
1304 case 27:
1305 vc->vc_reverse = 0;
1306 break;
1307 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1308 * Enables underscore, white foreground
1309 * with white underscore (Linux - use
1310 * default foreground).
1311 */
1312 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1313 vc->vc_underline = 1;
1314 break;
1315 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1316 * Disable underline option.
1317 * Reset colour to default? It did this
1318 * before...
1319 */
1320 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1321 vc->vc_underline = 0;
1322 break;
1323 case 49:
1324 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1325 break;
1326 default:
1327 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1328 vc->vc_color = color_table[vc->vc_par[i] - 30]
1329 | (vc->vc_color & 0xf0);
1330 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1331 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1332 | (vc->vc_color & 0x0f);
1333 break;
1334 }
1335 update_attr(vc);
1336 }
1337
1338 static void respond_string(const char *p, struct tty_port *port)
1339 {
1340 while (*p) {
1341 tty_insert_flip_char(port, *p, 0);
1342 p++;
1343 }
1344 tty_schedule_flip(port);
1345 }
1346
1347 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1348 {
1349 char buf[40];
1350
1351 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1352 respond_string(buf, tty->port);
1353 }
1354
1355 static inline void status_report(struct tty_struct *tty)
1356 {
1357 respond_string("\033[0n", tty->port); /* Terminal ok */
1358 }
1359
1360 static inline void respond_ID(struct tty_struct *tty)
1361 {
1362 respond_string(VT102ID, tty->port);
1363 }
1364
1365 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1366 {
1367 char buf[8];
1368
1369 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1370 (char)('!' + mry));
1371 respond_string(buf, tty->port);
1372 }
1373
1374 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1375 int mouse_reporting(void)
1376 {
1377 return vc_cons[fg_console].d->vc_report_mouse;
1378 }
1379
1380 /* console_lock is held */
1381 static void set_mode(struct vc_data *vc, int on_off)
1382 {
1383 int i;
1384
1385 for (i = 0; i <= vc->vc_npar; i++)
1386 if (vc->vc_ques) {
1387 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1388 case 1: /* Cursor keys send ^[Ox/^[[x */
1389 if (on_off)
1390 set_kbd(vc, decckm);
1391 else
1392 clr_kbd(vc, decckm);
1393 break;
1394 case 3: /* 80/132 mode switch unimplemented */
1395 vc->vc_deccolm = on_off;
1396 #if 0
1397 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1398 /* this alone does not suffice; some user mode
1399 utility has to change the hardware regs */
1400 #endif
1401 break;
1402 case 5: /* Inverted screen on/off */
1403 if (vc->vc_decscnm != on_off) {
1404 vc->vc_decscnm = on_off;
1405 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1406 update_attr(vc);
1407 }
1408 break;
1409 case 6: /* Origin relative/absolute */
1410 vc->vc_decom = on_off;
1411 gotoxay(vc, 0, 0);
1412 break;
1413 case 7: /* Autowrap on/off */
1414 vc->vc_decawm = on_off;
1415 break;
1416 case 8: /* Autorepeat on/off */
1417 if (on_off)
1418 set_kbd(vc, decarm);
1419 else
1420 clr_kbd(vc, decarm);
1421 break;
1422 case 9:
1423 vc->vc_report_mouse = on_off ? 1 : 0;
1424 break;
1425 case 25: /* Cursor on/off */
1426 vc->vc_deccm = on_off;
1427 break;
1428 case 1000:
1429 vc->vc_report_mouse = on_off ? 2 : 0;
1430 break;
1431 }
1432 } else {
1433 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1434 case 3: /* Monitor (display ctrls) */
1435 vc->vc_disp_ctrl = on_off;
1436 break;
1437 case 4: /* Insert Mode on/off */
1438 vc->vc_decim = on_off;
1439 break;
1440 case 20: /* Lf, Enter == CrLf/Lf */
1441 if (on_off)
1442 set_kbd(vc, lnm);
1443 else
1444 clr_kbd(vc, lnm);
1445 break;
1446 }
1447 }
1448 }
1449
1450 /* console_lock is held */
1451 static void setterm_command(struct vc_data *vc)
1452 {
1453 switch(vc->vc_par[0]) {
1454 case 1: /* set color for underline mode */
1455 if (vc->vc_can_do_color &&
1456 vc->vc_par[1] < 16) {
1457 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1458 if (vc->vc_underline)
1459 update_attr(vc);
1460 }
1461 break;
1462 case 2: /* set color for half intensity mode */
1463 if (vc->vc_can_do_color &&
1464 vc->vc_par[1] < 16) {
1465 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1466 if (vc->vc_intensity == 0)
1467 update_attr(vc);
1468 }
1469 break;
1470 case 8: /* store colors as defaults */
1471 vc->vc_def_color = vc->vc_attr;
1472 if (vc->vc_hi_font_mask == 0x100)
1473 vc->vc_def_color >>= 1;
1474 default_attr(vc);
1475 update_attr(vc);
1476 break;
1477 case 9: /* set blanking interval */
1478 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1479 poke_blanked_console();
1480 break;
1481 case 10: /* set bell frequency in Hz */
1482 if (vc->vc_npar >= 1)
1483 vc->vc_bell_pitch = vc->vc_par[1];
1484 else
1485 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1486 break;
1487 case 11: /* set bell duration in msec */
1488 if (vc->vc_npar >= 1)
1489 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1490 vc->vc_par[1] * HZ / 1000 : 0;
1491 else
1492 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1493 break;
1494 case 12: /* bring specified console to the front */
1495 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1496 set_console(vc->vc_par[1] - 1);
1497 break;
1498 case 13: /* unblank the screen */
1499 poke_blanked_console();
1500 break;
1501 case 14: /* set vesa powerdown interval */
1502 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1503 break;
1504 case 15: /* activate the previous console */
1505 set_console(last_console);
1506 break;
1507 }
1508 }
1509
1510 /* console_lock is held */
1511 static void csi_at(struct vc_data *vc, unsigned int nr)
1512 {
1513 if (nr > vc->vc_cols - vc->vc_x)
1514 nr = vc->vc_cols - vc->vc_x;
1515 else if (!nr)
1516 nr = 1;
1517 insert_char(vc, nr);
1518 }
1519
1520 /* console_lock is held */
1521 static void csi_L(struct vc_data *vc, unsigned int nr)
1522 {
1523 if (nr > vc->vc_rows - vc->vc_y)
1524 nr = vc->vc_rows - vc->vc_y;
1525 else if (!nr)
1526 nr = 1;
1527 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1528 vc->vc_need_wrap = 0;
1529 }
1530
1531 /* console_lock is held */
1532 static void csi_P(struct vc_data *vc, unsigned int nr)
1533 {
1534 if (nr > vc->vc_cols - vc->vc_x)
1535 nr = vc->vc_cols - vc->vc_x;
1536 else if (!nr)
1537 nr = 1;
1538 delete_char(vc, nr);
1539 }
1540
1541 /* console_lock is held */
1542 static void csi_M(struct vc_data *vc, unsigned int nr)
1543 {
1544 if (nr > vc->vc_rows - vc->vc_y)
1545 nr = vc->vc_rows - vc->vc_y;
1546 else if (!nr)
1547 nr=1;
1548 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1549 vc->vc_need_wrap = 0;
1550 }
1551
1552 /* console_lock is held (except via vc_init->reset_terminal */
1553 static void save_cur(struct vc_data *vc)
1554 {
1555 vc->vc_saved_x = vc->vc_x;
1556 vc->vc_saved_y = vc->vc_y;
1557 vc->vc_s_intensity = vc->vc_intensity;
1558 vc->vc_s_italic = vc->vc_italic;
1559 vc->vc_s_underline = vc->vc_underline;
1560 vc->vc_s_blink = vc->vc_blink;
1561 vc->vc_s_reverse = vc->vc_reverse;
1562 vc->vc_s_charset = vc->vc_charset;
1563 vc->vc_s_color = vc->vc_color;
1564 vc->vc_saved_G0 = vc->vc_G0_charset;
1565 vc->vc_saved_G1 = vc->vc_G1_charset;
1566 }
1567
1568 /* console_lock is held */
1569 static void restore_cur(struct vc_data *vc)
1570 {
1571 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1572 vc->vc_intensity = vc->vc_s_intensity;
1573 vc->vc_italic = vc->vc_s_italic;
1574 vc->vc_underline = vc->vc_s_underline;
1575 vc->vc_blink = vc->vc_s_blink;
1576 vc->vc_reverse = vc->vc_s_reverse;
1577 vc->vc_charset = vc->vc_s_charset;
1578 vc->vc_color = vc->vc_s_color;
1579 vc->vc_G0_charset = vc->vc_saved_G0;
1580 vc->vc_G1_charset = vc->vc_saved_G1;
1581 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1582 update_attr(vc);
1583 vc->vc_need_wrap = 0;
1584 }
1585
1586 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1587 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1588 ESpalette };
1589
1590 /* console_lock is held (except via vc_init()) */
1591 static void reset_terminal(struct vc_data *vc, int do_clear)
1592 {
1593 vc->vc_top = 0;
1594 vc->vc_bottom = vc->vc_rows;
1595 vc->vc_state = ESnormal;
1596 vc->vc_ques = 0;
1597 vc->vc_translate = set_translate(LAT1_MAP, vc);
1598 vc->vc_G0_charset = LAT1_MAP;
1599 vc->vc_G1_charset = GRAF_MAP;
1600 vc->vc_charset = 0;
1601 vc->vc_need_wrap = 0;
1602 vc->vc_report_mouse = 0;
1603 vc->vc_utf = default_utf8;
1604 vc->vc_utf_count = 0;
1605
1606 vc->vc_disp_ctrl = 0;
1607 vc->vc_toggle_meta = 0;
1608
1609 vc->vc_decscnm = 0;
1610 vc->vc_decom = 0;
1611 vc->vc_decawm = 1;
1612 vc->vc_deccm = global_cursor_default;
1613 vc->vc_decim = 0;
1614
1615 vt_reset_keyboard(vc->vc_num);
1616
1617 vc->vc_cursor_type = cur_default;
1618 vc->vc_complement_mask = vc->vc_s_complement_mask;
1619
1620 default_attr(vc);
1621 update_attr(vc);
1622
1623 vc->vc_tab_stop[0] = 0x01010100;
1624 vc->vc_tab_stop[1] =
1625 vc->vc_tab_stop[2] =
1626 vc->vc_tab_stop[3] =
1627 vc->vc_tab_stop[4] =
1628 vc->vc_tab_stop[5] =
1629 vc->vc_tab_stop[6] =
1630 vc->vc_tab_stop[7] = 0x01010101;
1631
1632 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1633 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1634
1635 gotoxy(vc, 0, 0);
1636 save_cur(vc);
1637 if (do_clear)
1638 csi_J(vc, 2);
1639 }
1640
1641 /* console_lock is held */
1642 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1643 {
1644 /*
1645 * Control characters can be used in the _middle_
1646 * of an escape sequence.
1647 */
1648 switch (c) {
1649 case 0:
1650 return;
1651 case 7:
1652 if (vc->vc_bell_duration)
1653 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1654 return;
1655 case 8:
1656 bs(vc);
1657 return;
1658 case 9:
1659 vc->vc_pos -= (vc->vc_x << 1);
1660 while (vc->vc_x < vc->vc_cols - 1) {
1661 vc->vc_x++;
1662 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1663 break;
1664 }
1665 vc->vc_pos += (vc->vc_x << 1);
1666 notify_write(vc, '\t');
1667 return;
1668 case 10: case 11: case 12:
1669 lf(vc);
1670 if (!is_kbd(vc, lnm))
1671 return;
1672 case 13:
1673 cr(vc);
1674 return;
1675 case 14:
1676 vc->vc_charset = 1;
1677 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1678 vc->vc_disp_ctrl = 1;
1679 return;
1680 case 15:
1681 vc->vc_charset = 0;
1682 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1683 vc->vc_disp_ctrl = 0;
1684 return;
1685 case 24: case 26:
1686 vc->vc_state = ESnormal;
1687 return;
1688 case 27:
1689 vc->vc_state = ESesc;
1690 return;
1691 case 127:
1692 del(vc);
1693 return;
1694 case 128+27:
1695 vc->vc_state = ESsquare;
1696 return;
1697 }
1698 switch(vc->vc_state) {
1699 case ESesc:
1700 vc->vc_state = ESnormal;
1701 switch (c) {
1702 case '[':
1703 vc->vc_state = ESsquare;
1704 return;
1705 case ']':
1706 vc->vc_state = ESnonstd;
1707 return;
1708 case '%':
1709 vc->vc_state = ESpercent;
1710 return;
1711 case 'E':
1712 cr(vc);
1713 lf(vc);
1714 return;
1715 case 'M':
1716 ri(vc);
1717 return;
1718 case 'D':
1719 lf(vc);
1720 return;
1721 case 'H':
1722 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1723 return;
1724 case 'Z':
1725 respond_ID(tty);
1726 return;
1727 case '7':
1728 save_cur(vc);
1729 return;
1730 case '8':
1731 restore_cur(vc);
1732 return;
1733 case '(':
1734 vc->vc_state = ESsetG0;
1735 return;
1736 case ')':
1737 vc->vc_state = ESsetG1;
1738 return;
1739 case '#':
1740 vc->vc_state = EShash;
1741 return;
1742 case 'c':
1743 reset_terminal(vc, 1);
1744 return;
1745 case '>': /* Numeric keypad */
1746 clr_kbd(vc, kbdapplic);
1747 return;
1748 case '=': /* Appl. keypad */
1749 set_kbd(vc, kbdapplic);
1750 return;
1751 }
1752 return;
1753 case ESnonstd:
1754 if (c=='P') { /* palette escape sequence */
1755 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1756 vc->vc_par[vc->vc_npar] = 0;
1757 vc->vc_npar = 0;
1758 vc->vc_state = ESpalette;
1759 return;
1760 } else if (c=='R') { /* reset palette */
1761 reset_palette(vc);
1762 vc->vc_state = ESnormal;
1763 } else
1764 vc->vc_state = ESnormal;
1765 return;
1766 case ESpalette:
1767 if (isxdigit(c)) {
1768 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1769 if (vc->vc_npar == 7) {
1770 int i = vc->vc_par[0] * 3, j = 1;
1771 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1772 vc->vc_palette[i++] += vc->vc_par[j++];
1773 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1774 vc->vc_palette[i++] += vc->vc_par[j++];
1775 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1776 vc->vc_palette[i] += vc->vc_par[j];
1777 set_palette(vc);
1778 vc->vc_state = ESnormal;
1779 }
1780 } else
1781 vc->vc_state = ESnormal;
1782 return;
1783 case ESsquare:
1784 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1785 vc->vc_par[vc->vc_npar] = 0;
1786 vc->vc_npar = 0;
1787 vc->vc_state = ESgetpars;
1788 if (c == '[') { /* Function key */
1789 vc->vc_state=ESfunckey;
1790 return;
1791 }
1792 vc->vc_ques = (c == '?');
1793 if (vc->vc_ques)
1794 return;
1795 case ESgetpars:
1796 if (c == ';' && vc->vc_npar < NPAR - 1) {
1797 vc->vc_npar++;
1798 return;
1799 } else if (c>='0' && c<='9') {
1800 vc->vc_par[vc->vc_npar] *= 10;
1801 vc->vc_par[vc->vc_npar] += c - '0';
1802 return;
1803 } else
1804 vc->vc_state = ESgotpars;
1805 case ESgotpars:
1806 vc->vc_state = ESnormal;
1807 switch(c) {
1808 case 'h':
1809 set_mode(vc, 1);
1810 return;
1811 case 'l':
1812 set_mode(vc, 0);
1813 return;
1814 case 'c':
1815 if (vc->vc_ques) {
1816 if (vc->vc_par[0])
1817 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1818 else
1819 vc->vc_cursor_type = cur_default;
1820 return;
1821 }
1822 break;
1823 case 'm':
1824 if (vc->vc_ques) {
1825 clear_selection();
1826 if (vc->vc_par[0])
1827 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1828 else
1829 vc->vc_complement_mask = vc->vc_s_complement_mask;
1830 return;
1831 }
1832 break;
1833 case 'n':
1834 if (!vc->vc_ques) {
1835 if (vc->vc_par[0] == 5)
1836 status_report(tty);
1837 else if (vc->vc_par[0] == 6)
1838 cursor_report(vc, tty);
1839 }
1840 return;
1841 }
1842 if (vc->vc_ques) {
1843 vc->vc_ques = 0;
1844 return;
1845 }
1846 switch(c) {
1847 case 'G': case '`':
1848 if (vc->vc_par[0])
1849 vc->vc_par[0]--;
1850 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1851 return;
1852 case 'A':
1853 if (!vc->vc_par[0])
1854 vc->vc_par[0]++;
1855 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1856 return;
1857 case 'B': case 'e':
1858 if (!vc->vc_par[0])
1859 vc->vc_par[0]++;
1860 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1861 return;
1862 case 'C': case 'a':
1863 if (!vc->vc_par[0])
1864 vc->vc_par[0]++;
1865 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1866 return;
1867 case 'D':
1868 if (!vc->vc_par[0])
1869 vc->vc_par[0]++;
1870 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1871 return;
1872 case 'E':
1873 if (!vc->vc_par[0])
1874 vc->vc_par[0]++;
1875 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1876 return;
1877 case 'F':
1878 if (!vc->vc_par[0])
1879 vc->vc_par[0]++;
1880 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1881 return;
1882 case 'd':
1883 if (vc->vc_par[0])
1884 vc->vc_par[0]--;
1885 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1886 return;
1887 case 'H': case 'f':
1888 if (vc->vc_par[0])
1889 vc->vc_par[0]--;
1890 if (vc->vc_par[1])
1891 vc->vc_par[1]--;
1892 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1893 return;
1894 case 'J':
1895 csi_J(vc, vc->vc_par[0]);
1896 return;
1897 case 'K':
1898 csi_K(vc, vc->vc_par[0]);
1899 return;
1900 case 'L':
1901 csi_L(vc, vc->vc_par[0]);
1902 return;
1903 case 'M':
1904 csi_M(vc, vc->vc_par[0]);
1905 return;
1906 case 'P':
1907 csi_P(vc, vc->vc_par[0]);
1908 return;
1909 case 'c':
1910 if (!vc->vc_par[0])
1911 respond_ID(tty);
1912 return;
1913 case 'g':
1914 if (!vc->vc_par[0])
1915 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1916 else if (vc->vc_par[0] == 3) {
1917 vc->vc_tab_stop[0] =
1918 vc->vc_tab_stop[1] =
1919 vc->vc_tab_stop[2] =
1920 vc->vc_tab_stop[3] =
1921 vc->vc_tab_stop[4] =
1922 vc->vc_tab_stop[5] =
1923 vc->vc_tab_stop[6] =
1924 vc->vc_tab_stop[7] = 0;
1925 }
1926 return;
1927 case 'm':
1928 csi_m(vc);
1929 return;
1930 case 'q': /* DECLL - but only 3 leds */
1931 /* map 0,1,2,3 to 0,1,2,4 */
1932 if (vc->vc_par[0] < 4)
1933 vt_set_led_state(vc->vc_num,
1934 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1935 return;
1936 case 'r':
1937 if (!vc->vc_par[0])
1938 vc->vc_par[0]++;
1939 if (!vc->vc_par[1])
1940 vc->vc_par[1] = vc->vc_rows;
1941 /* Minimum allowed region is 2 lines */
1942 if (vc->vc_par[0] < vc->vc_par[1] &&
1943 vc->vc_par[1] <= vc->vc_rows) {
1944 vc->vc_top = vc->vc_par[0] - 1;
1945 vc->vc_bottom = vc->vc_par[1];
1946 gotoxay(vc, 0, 0);
1947 }
1948 return;
1949 case 's':
1950 save_cur(vc);
1951 return;
1952 case 'u':
1953 restore_cur(vc);
1954 return;
1955 case 'X':
1956 csi_X(vc, vc->vc_par[0]);
1957 return;
1958 case '@':
1959 csi_at(vc, vc->vc_par[0]);
1960 return;
1961 case ']': /* setterm functions */
1962 setterm_command(vc);
1963 return;
1964 }
1965 return;
1966 case ESpercent:
1967 vc->vc_state = ESnormal;
1968 switch (c) {
1969 case '@': /* defined in ISO 2022 */
1970 vc->vc_utf = 0;
1971 return;
1972 case 'G': /* prelim official escape code */
1973 case '8': /* retained for compatibility */
1974 vc->vc_utf = 1;
1975 return;
1976 }
1977 return;
1978 case ESfunckey:
1979 vc->vc_state = ESnormal;
1980 return;
1981 case EShash:
1982 vc->vc_state = ESnormal;
1983 if (c == '8') {
1984 /* DEC screen alignment test. kludge :-) */
1985 vc->vc_video_erase_char =
1986 (vc->vc_video_erase_char & 0xff00) | 'E';
1987 csi_J(vc, 2);
1988 vc->vc_video_erase_char =
1989 (vc->vc_video_erase_char & 0xff00) | ' ';
1990 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1991 }
1992 return;
1993 case ESsetG0:
1994 if (c == '0')
1995 vc->vc_G0_charset = GRAF_MAP;
1996 else if (c == 'B')
1997 vc->vc_G0_charset = LAT1_MAP;
1998 else if (c == 'U')
1999 vc->vc_G0_charset = IBMPC_MAP;
2000 else if (c == 'K')
2001 vc->vc_G0_charset = USER_MAP;
2002 if (vc->vc_charset == 0)
2003 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2004 vc->vc_state = ESnormal;
2005 return;
2006 case ESsetG1:
2007 if (c == '0')
2008 vc->vc_G1_charset = GRAF_MAP;
2009 else if (c == 'B')
2010 vc->vc_G1_charset = LAT1_MAP;
2011 else if (c == 'U')
2012 vc->vc_G1_charset = IBMPC_MAP;
2013 else if (c == 'K')
2014 vc->vc_G1_charset = USER_MAP;
2015 if (vc->vc_charset == 1)
2016 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2017 vc->vc_state = ESnormal;
2018 return;
2019 default:
2020 vc->vc_state = ESnormal;
2021 }
2022 }
2023
2024 /* is_double_width() is based on the wcwidth() implementation by
2025 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2026 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2027 */
2028 struct interval {
2029 uint32_t first;
2030 uint32_t last;
2031 };
2032
2033 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2034 {
2035 int min = 0;
2036 int mid;
2037
2038 if (ucs < table[0].first || ucs > table[max].last)
2039 return 0;
2040 while (max >= min) {
2041 mid = (min + max) / 2;
2042 if (ucs > table[mid].last)
2043 min = mid + 1;
2044 else if (ucs < table[mid].first)
2045 max = mid - 1;
2046 else
2047 return 1;
2048 }
2049 return 0;
2050 }
2051
2052 static int is_double_width(uint32_t ucs)
2053 {
2054 static const struct interval double_width[] = {
2055 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2056 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2057 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2058 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2059 };
2060 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2061 }
2062
2063 /* acquires console_lock */
2064 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2065 {
2066 #ifdef VT_BUF_VRAM_ONLY
2067 #define FLUSH do { } while(0);
2068 #else
2069 #define FLUSH if (draw_x >= 0) { \
2070 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2071 draw_x = -1; \
2072 }
2073 #endif
2074
2075 int c, tc, ok, n = 0, draw_x = -1;
2076 unsigned int currcons;
2077 unsigned long draw_from = 0, draw_to = 0;
2078 struct vc_data *vc;
2079 unsigned char vc_attr;
2080 struct vt_notifier_param param;
2081 uint8_t rescan;
2082 uint8_t inverse;
2083 uint8_t width;
2084 u16 himask, charmask;
2085
2086 if (in_interrupt())
2087 return count;
2088
2089 might_sleep();
2090
2091 console_lock();
2092 vc = tty->driver_data;
2093 if (vc == NULL) {
2094 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2095 console_unlock();
2096 return 0;
2097 }
2098
2099 currcons = vc->vc_num;
2100 if (!vc_cons_allocated(currcons)) {
2101 /* could this happen? */
2102 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2103 console_unlock();
2104 return 0;
2105 }
2106
2107 himask = vc->vc_hi_font_mask;
2108 charmask = himask ? 0x1ff : 0xff;
2109
2110 /* undraw cursor first */
2111 if (IS_FG(vc))
2112 hide_cursor(vc);
2113
2114 param.vc = vc;
2115
2116 while (!tty->stopped && count) {
2117 int orig = *buf;
2118 c = orig;
2119 buf++;
2120 n++;
2121 count--;
2122 rescan = 0;
2123 inverse = 0;
2124 width = 1;
2125
2126 /* Do no translation at all in control states */
2127 if (vc->vc_state != ESnormal) {
2128 tc = c;
2129 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2130 /* Combine UTF-8 into Unicode in vc_utf_char.
2131 * vc_utf_count is the number of continuation bytes still
2132 * expected to arrive.
2133 * vc_npar is the number of continuation bytes arrived so
2134 * far
2135 */
2136 rescan_last_byte:
2137 if ((c & 0xc0) == 0x80) {
2138 /* Continuation byte received */
2139 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2140 if (vc->vc_utf_count) {
2141 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2142 vc->vc_npar++;
2143 if (--vc->vc_utf_count) {
2144 /* Still need some bytes */
2145 continue;
2146 }
2147 /* Got a whole character */
2148 c = vc->vc_utf_char;
2149 /* Reject overlong sequences */
2150 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2151 c > utf8_length_changes[vc->vc_npar])
2152 c = 0xfffd;
2153 } else {
2154 /* Unexpected continuation byte */
2155 vc->vc_utf_count = 0;
2156 c = 0xfffd;
2157 }
2158 } else {
2159 /* Single ASCII byte or first byte of a sequence received */
2160 if (vc->vc_utf_count) {
2161 /* Continuation byte expected */
2162 rescan = 1;
2163 vc->vc_utf_count = 0;
2164 c = 0xfffd;
2165 } else if (c > 0x7f) {
2166 /* First byte of a multibyte sequence received */
2167 vc->vc_npar = 0;
2168 if ((c & 0xe0) == 0xc0) {
2169 vc->vc_utf_count = 1;
2170 vc->vc_utf_char = (c & 0x1f);
2171 } else if ((c & 0xf0) == 0xe0) {
2172 vc->vc_utf_count = 2;
2173 vc->vc_utf_char = (c & 0x0f);
2174 } else if ((c & 0xf8) == 0xf0) {
2175 vc->vc_utf_count = 3;
2176 vc->vc_utf_char = (c & 0x07);
2177 } else if ((c & 0xfc) == 0xf8) {
2178 vc->vc_utf_count = 4;
2179 vc->vc_utf_char = (c & 0x03);
2180 } else if ((c & 0xfe) == 0xfc) {
2181 vc->vc_utf_count = 5;
2182 vc->vc_utf_char = (c & 0x01);
2183 } else {
2184 /* 254 and 255 are invalid */
2185 c = 0xfffd;
2186 }
2187 if (vc->vc_utf_count) {
2188 /* Still need some bytes */
2189 continue;
2190 }
2191 }
2192 /* Nothing to do if an ASCII byte was received */
2193 }
2194 /* End of UTF-8 decoding. */
2195 /* c is the received character, or U+FFFD for invalid sequences. */
2196 /* Replace invalid Unicode code points with U+FFFD too */
2197 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2198 c = 0xfffd;
2199 tc = c;
2200 } else { /* no utf or alternate charset mode */
2201 tc = vc_translate(vc, c);
2202 }
2203
2204 param.c = tc;
2205 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2206 &param) == NOTIFY_STOP)
2207 continue;
2208
2209 /* If the original code was a control character we
2210 * only allow a glyph to be displayed if the code is
2211 * not normally used (such as for cursor movement) or
2212 * if the disp_ctrl mode has been explicitly enabled.
2213 * Certain characters (as given by the CTRL_ALWAYS
2214 * bitmap) are always displayed as control characters,
2215 * as the console would be pretty useless without
2216 * them; to display an arbitrary font position use the
2217 * direct-to-font zone in UTF-8 mode.
2218 */
2219 ok = tc && (c >= 32 ||
2220 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2221 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2222 && (c != 127 || vc->vc_disp_ctrl)
2223 && (c != 128+27);
2224
2225 if (vc->vc_state == ESnormal && ok) {
2226 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2227 if (is_double_width(c))
2228 width = 2;
2229 }
2230 /* Now try to find out how to display it */
2231 tc = conv_uni_to_pc(vc, tc);
2232 if (tc & ~charmask) {
2233 if (tc == -1 || tc == -2) {
2234 continue; /* nothing to display */
2235 }
2236 /* Glyph not found */
2237 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2238 /* In legacy mode use the glyph we get by a 1:1 mapping.
2239 This would make absolutely no sense with Unicode in mind,
2240 but do this for ASCII characters since a font may lack
2241 Unicode mapping info and we don't want to end up with
2242 having question marks only. */
2243 tc = c;
2244 } else {
2245 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2246 tc = conv_uni_to_pc(vc, 0xfffd);
2247 if (tc < 0) {
2248 inverse = 1;
2249 tc = conv_uni_to_pc(vc, '?');
2250 if (tc < 0) tc = '?';
2251 }
2252 }
2253 }
2254
2255 if (!inverse) {
2256 vc_attr = vc->vc_attr;
2257 } else {
2258 /* invert vc_attr */
2259 if (!vc->vc_can_do_color) {
2260 vc_attr = (vc->vc_attr) ^ 0x08;
2261 } else if (vc->vc_hi_font_mask == 0x100) {
2262 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2263 } else {
2264 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2265 }
2266 FLUSH
2267 }
2268
2269 while (1) {
2270 if (vc->vc_need_wrap || vc->vc_decim)
2271 FLUSH
2272 if (vc->vc_need_wrap) {
2273 cr(vc);
2274 lf(vc);
2275 }
2276 if (vc->vc_decim)
2277 insert_char(vc, 1);
2278 scr_writew(himask ?
2279 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2280 (vc_attr << 8) + tc,
2281 (u16 *) vc->vc_pos);
2282 if (DO_UPDATE(vc) && draw_x < 0) {
2283 draw_x = vc->vc_x;
2284 draw_from = vc->vc_pos;
2285 }
2286 if (vc->vc_x == vc->vc_cols - 1) {
2287 vc->vc_need_wrap = vc->vc_decawm;
2288 draw_to = vc->vc_pos + 2;
2289 } else {
2290 vc->vc_x++;
2291 draw_to = (vc->vc_pos += 2);
2292 }
2293
2294 if (!--width) break;
2295
2296 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2297 if (tc < 0) tc = ' ';
2298 }
2299 notify_write(vc, c);
2300
2301 if (inverse) {
2302 FLUSH
2303 }
2304
2305 if (rescan) {
2306 rescan = 0;
2307 inverse = 0;
2308 width = 1;
2309 c = orig;
2310 goto rescan_last_byte;
2311 }
2312 continue;
2313 }
2314 FLUSH
2315 do_con_trol(tty, vc, orig);
2316 }
2317 FLUSH
2318 console_conditional_schedule();
2319 console_unlock();
2320 notify_update(vc);
2321 return n;
2322 #undef FLUSH
2323 }
2324
2325 /*
2326 * This is the console switching callback.
2327 *
2328 * Doing console switching in a process context allows
2329 * us to do the switches asynchronously (needed when we want
2330 * to switch due to a keyboard interrupt). Synchronization
2331 * with other console code and prevention of re-entrancy is
2332 * ensured with console_lock.
2333 */
2334 static void console_callback(struct work_struct *ignored)
2335 {
2336 console_lock();
2337
2338 if (want_console >= 0) {
2339 if (want_console != fg_console &&
2340 vc_cons_allocated(want_console)) {
2341 hide_cursor(vc_cons[fg_console].d);
2342 change_console(vc_cons[want_console].d);
2343 /* we only changed when the console had already
2344 been allocated - a new console is not created
2345 in an interrupt routine */
2346 }
2347 want_console = -1;
2348 }
2349 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2350 do_poke_blanked_console = 0;
2351 poke_blanked_console();
2352 }
2353 if (scrollback_delta) {
2354 struct vc_data *vc = vc_cons[fg_console].d;
2355 clear_selection();
2356 if (vc->vc_mode == KD_TEXT)
2357 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2358 scrollback_delta = 0;
2359 }
2360 if (blank_timer_expired) {
2361 do_blank_screen(0);
2362 blank_timer_expired = 0;
2363 }
2364 notify_update(vc_cons[fg_console].d);
2365
2366 console_unlock();
2367 }
2368
2369 int set_console(int nr)
2370 {
2371 struct vc_data *vc = vc_cons[fg_console].d;
2372
2373 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2374 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2375
2376 /*
2377 * Console switch will fail in console_callback() or
2378 * change_console() so there is no point scheduling
2379 * the callback
2380 *
2381 * Existing set_console() users don't check the return
2382 * value so this shouldn't break anything
2383 */
2384 return -EINVAL;
2385 }
2386
2387 want_console = nr;
2388 schedule_console_callback();
2389
2390 return 0;
2391 }
2392
2393 struct tty_driver *console_driver;
2394
2395 #ifdef CONFIG_VT_CONSOLE
2396
2397 /**
2398 * vt_kmsg_redirect() - Sets/gets the kernel message console
2399 * @new: The new virtual terminal number or -1 if the console should stay
2400 * unchanged
2401 *
2402 * By default, the kernel messages are always printed on the current virtual
2403 * console. However, the user may modify that default with the
2404 * TIOCL_SETKMSGREDIRECT ioctl call.
2405 *
2406 * This function sets the kernel message console to be @new. It returns the old
2407 * virtual console number. The virtual terminal number 0 (both as parameter and
2408 * return value) means no redirection (i.e. always printed on the currently
2409 * active console).
2410 *
2411 * The parameter -1 means that only the current console is returned, but the
2412 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2413 * case to make the code more understandable.
2414 *
2415 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2416 * the parameter and always returns 0.
2417 */
2418 int vt_kmsg_redirect(int new)
2419 {
2420 static int kmsg_con;
2421
2422 if (new != -1)
2423 return xchg(&kmsg_con, new);
2424 else
2425 return kmsg_con;
2426 }
2427
2428 /*
2429 * Console on virtual terminal
2430 *
2431 * The console must be locked when we get here.
2432 */
2433
2434 static void vt_console_print(struct console *co, const char *b, unsigned count)
2435 {
2436 struct vc_data *vc = vc_cons[fg_console].d;
2437 unsigned char c;
2438 static DEFINE_SPINLOCK(printing_lock);
2439 const ushort *start;
2440 ushort cnt = 0;
2441 ushort myx;
2442 int kmsg_console;
2443
2444 /* console busy or not yet initialized */
2445 if (!printable)
2446 return;
2447 if (!spin_trylock(&printing_lock))
2448 return;
2449
2450 kmsg_console = vt_get_kmsg_redirect();
2451 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2452 vc = vc_cons[kmsg_console - 1].d;
2453
2454 /* read `x' only after setting currcons properly (otherwise
2455 the `x' macro will read the x of the foreground console). */
2456 myx = vc->vc_x;
2457
2458 if (!vc_cons_allocated(fg_console)) {
2459 /* impossible */
2460 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2461 goto quit;
2462 }
2463
2464 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2465 goto quit;
2466
2467 /* undraw cursor first */
2468 if (IS_FG(vc))
2469 hide_cursor(vc);
2470
2471 start = (ushort *)vc->vc_pos;
2472
2473 /* Contrived structure to try to emulate original need_wrap behaviour
2474 * Problems caused when we have need_wrap set on '\n' character */
2475 while (count--) {
2476 c = *b++;
2477 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2478 if (cnt > 0) {
2479 if (CON_IS_VISIBLE(vc))
2480 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2481 vc->vc_x += cnt;
2482 if (vc->vc_need_wrap)
2483 vc->vc_x--;
2484 cnt = 0;
2485 }
2486 if (c == 8) { /* backspace */
2487 bs(vc);
2488 start = (ushort *)vc->vc_pos;
2489 myx = vc->vc_x;
2490 continue;
2491 }
2492 if (c != 13)
2493 lf(vc);
2494 cr(vc);
2495 start = (ushort *)vc->vc_pos;
2496 myx = vc->vc_x;
2497 if (c == 10 || c == 13)
2498 continue;
2499 }
2500 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2501 notify_write(vc, c);
2502 cnt++;
2503 if (myx == vc->vc_cols - 1) {
2504 vc->vc_need_wrap = 1;
2505 continue;
2506 }
2507 vc->vc_pos += 2;
2508 myx++;
2509 }
2510 if (cnt > 0) {
2511 if (CON_IS_VISIBLE(vc))
2512 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2513 vc->vc_x += cnt;
2514 if (vc->vc_x == vc->vc_cols) {
2515 vc->vc_x--;
2516 vc->vc_need_wrap = 1;
2517 }
2518 }
2519 set_cursor(vc);
2520 notify_update(vc);
2521
2522 quit:
2523 spin_unlock(&printing_lock);
2524 }
2525
2526 static struct tty_driver *vt_console_device(struct console *c, int *index)
2527 {
2528 *index = c->index ? c->index-1 : fg_console;
2529 return console_driver;
2530 }
2531
2532 static struct console vt_console_driver = {
2533 .name = "tty",
2534 .write = vt_console_print,
2535 .device = vt_console_device,
2536 .unblank = unblank_screen,
2537 .flags = CON_PRINTBUFFER,
2538 .index = -1,
2539 };
2540 #endif
2541
2542 /*
2543 * Handling of Linux-specific VC ioctls
2544 */
2545
2546 /*
2547 * Generally a bit racy with respect to console_lock();.
2548 *
2549 * There are some functions which don't need it.
2550 *
2551 * There are some functions which can sleep for arbitrary periods
2552 * (paste_selection) but we don't need the lock there anyway.
2553 *
2554 * set_selection has locking, and definitely needs it
2555 */
2556
2557 int tioclinux(struct tty_struct *tty, unsigned long arg)
2558 {
2559 char type, data;
2560 char __user *p = (char __user *)arg;
2561 int lines;
2562 int ret;
2563
2564 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2565 return -EPERM;
2566 if (get_user(type, p))
2567 return -EFAULT;
2568 ret = 0;
2569
2570 switch (type)
2571 {
2572 case TIOCL_SETSEL:
2573 console_lock();
2574 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2575 console_unlock();
2576 break;
2577 case TIOCL_PASTESEL:
2578 ret = paste_selection(tty);
2579 break;
2580 case TIOCL_UNBLANKSCREEN:
2581 console_lock();
2582 unblank_screen();
2583 console_unlock();
2584 break;
2585 case TIOCL_SELLOADLUT:
2586 console_lock();
2587 ret = sel_loadlut(p);
2588 console_unlock();
2589 break;
2590 case TIOCL_GETSHIFTSTATE:
2591
2592 /*
2593 * Make it possible to react to Shift+Mousebutton.
2594 * Note that 'shift_state' is an undocumented
2595 * kernel-internal variable; programs not closely
2596 * related to the kernel should not use this.
2597 */
2598 data = vt_get_shift_state();
2599 ret = __put_user(data, p);
2600 break;
2601 case TIOCL_GETMOUSEREPORTING:
2602 console_lock(); /* May be overkill */
2603 data = mouse_reporting();
2604 console_unlock();
2605 ret = __put_user(data, p);
2606 break;
2607 case TIOCL_SETVESABLANK:
2608 console_lock();
2609 ret = set_vesa_blanking(p);
2610 console_unlock();
2611 break;
2612 case TIOCL_GETKMSGREDIRECT:
2613 data = vt_get_kmsg_redirect();
2614 ret = __put_user(data, p);
2615 break;
2616 case TIOCL_SETKMSGREDIRECT:
2617 if (!capable(CAP_SYS_ADMIN)) {
2618 ret = -EPERM;
2619 } else {
2620 if (get_user(data, p+1))
2621 ret = -EFAULT;
2622 else
2623 vt_kmsg_redirect(data);
2624 }
2625 break;
2626 case TIOCL_GETFGCONSOLE:
2627 /* No locking needed as this is a transiently
2628 correct return anyway if the caller hasn't
2629 disabled switching */
2630 ret = fg_console;
2631 break;
2632 case TIOCL_SCROLLCONSOLE:
2633 if (get_user(lines, (s32 __user *)(p+4))) {
2634 ret = -EFAULT;
2635 } else {
2636 /* Need the console lock here. Note that lots
2637 of other calls need fixing before the lock
2638 is actually useful ! */
2639 console_lock();
2640 scrollfront(vc_cons[fg_console].d, lines);
2641 console_unlock();
2642 ret = 0;
2643 }
2644 break;
2645 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2646 console_lock();
2647 ignore_poke = 1;
2648 do_blank_screen(0);
2649 console_unlock();
2650 break;
2651 case TIOCL_BLANKEDSCREEN:
2652 ret = console_blanked;
2653 break;
2654 default:
2655 ret = -EINVAL;
2656 break;
2657 }
2658 return ret;
2659 }
2660
2661 /*
2662 * /dev/ttyN handling
2663 */
2664
2665 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2666 {
2667 int retval;
2668
2669 retval = do_con_write(tty, buf, count);
2670 con_flush_chars(tty);
2671
2672 return retval;
2673 }
2674
2675 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2676 {
2677 if (in_interrupt())
2678 return 0; /* n_r3964 calls put_char() from interrupt context */
2679 return do_con_write(tty, &ch, 1);
2680 }
2681
2682 static int con_write_room(struct tty_struct *tty)
2683 {
2684 if (tty->stopped)
2685 return 0;
2686 return 32768; /* No limit, really; we're not buffering */
2687 }
2688
2689 static int con_chars_in_buffer(struct tty_struct *tty)
2690 {
2691 return 0; /* we're not buffering */
2692 }
2693
2694 /*
2695 * con_throttle and con_unthrottle are only used for
2696 * paste_selection(), which has to stuff in a large number of
2697 * characters...
2698 */
2699 static void con_throttle(struct tty_struct *tty)
2700 {
2701 }
2702
2703 static void con_unthrottle(struct tty_struct *tty)
2704 {
2705 struct vc_data *vc = tty->driver_data;
2706
2707 wake_up_interruptible(&vc->paste_wait);
2708 }
2709
2710 /*
2711 * Turn the Scroll-Lock LED on when the tty is stopped
2712 */
2713 static void con_stop(struct tty_struct *tty)
2714 {
2715 int console_num;
2716 if (!tty)
2717 return;
2718 console_num = tty->index;
2719 if (!vc_cons_allocated(console_num))
2720 return;
2721 vt_kbd_con_stop(console_num);
2722 }
2723
2724 /*
2725 * Turn the Scroll-Lock LED off when the console is started
2726 */
2727 static void con_start(struct tty_struct *tty)
2728 {
2729 int console_num;
2730 if (!tty)
2731 return;
2732 console_num = tty->index;
2733 if (!vc_cons_allocated(console_num))
2734 return;
2735 vt_kbd_con_start(console_num);
2736 }
2737
2738 static void con_flush_chars(struct tty_struct *tty)
2739 {
2740 struct vc_data *vc;
2741
2742 if (in_interrupt()) /* from flush_to_ldisc */
2743 return;
2744
2745 /* if we race with con_close(), vt may be null */
2746 console_lock();
2747 vc = tty->driver_data;
2748 if (vc)
2749 set_cursor(vc);
2750 console_unlock();
2751 }
2752
2753 /*
2754 * Allocate the console screen memory.
2755 */
2756 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2757 {
2758 unsigned int currcons = tty->index;
2759 struct vc_data *vc;
2760 int ret;
2761
2762 console_lock();
2763 ret = vc_allocate(currcons);
2764 if (ret)
2765 goto unlock;
2766
2767 vc = vc_cons[currcons].d;
2768
2769 /* Still being freed */
2770 if (vc->port.tty) {
2771 ret = -ERESTARTSYS;
2772 goto unlock;
2773 }
2774
2775 ret = tty_port_install(&vc->port, driver, tty);
2776 if (ret)
2777 goto unlock;
2778
2779 tty->driver_data = vc;
2780 vc->port.tty = tty;
2781
2782 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2783 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2784 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2785 }
2786 if (vc->vc_utf)
2787 tty->termios.c_iflag |= IUTF8;
2788 else
2789 tty->termios.c_iflag &= ~IUTF8;
2790 unlock:
2791 console_unlock();
2792 return ret;
2793 }
2794
2795 static int con_open(struct tty_struct *tty, struct file *filp)
2796 {
2797 /* everything done in install */
2798 return 0;
2799 }
2800
2801
2802 static void con_close(struct tty_struct *tty, struct file *filp)
2803 {
2804 /* Nothing to do - we defer to shutdown */
2805 }
2806
2807 static void con_shutdown(struct tty_struct *tty)
2808 {
2809 struct vc_data *vc = tty->driver_data;
2810 BUG_ON(vc == NULL);
2811 console_lock();
2812 vc->port.tty = NULL;
2813 console_unlock();
2814 }
2815
2816 static int default_color = 7; /* white */
2817 static int default_italic_color = 2; // green (ASCII)
2818 static int default_underline_color = 3; // cyan (ASCII)
2819 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2820 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2821 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2822
2823 static void vc_init(struct vc_data *vc, unsigned int rows,
2824 unsigned int cols, int do_clear)
2825 {
2826 int j, k ;
2827
2828 vc->vc_cols = cols;
2829 vc->vc_rows = rows;
2830 vc->vc_size_row = cols << 1;
2831 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2832
2833 set_origin(vc);
2834 vc->vc_pos = vc->vc_origin;
2835 reset_vc(vc);
2836 for (j=k=0; j<16; j++) {
2837 vc->vc_palette[k++] = default_red[j] ;
2838 vc->vc_palette[k++] = default_grn[j] ;
2839 vc->vc_palette[k++] = default_blu[j] ;
2840 }
2841 vc->vc_def_color = default_color;
2842 vc->vc_ulcolor = default_underline_color;
2843 vc->vc_itcolor = default_italic_color;
2844 vc->vc_halfcolor = 0x08; /* grey */
2845 init_waitqueue_head(&vc->paste_wait);
2846 reset_terminal(vc, do_clear);
2847 }
2848
2849 /*
2850 * This routine initializes console interrupts, and does nothing
2851 * else. If you want the screen to clear, call tty_write with
2852 * the appropriate escape-sequence.
2853 */
2854
2855 static int __init con_init(void)
2856 {
2857 const char *display_desc = NULL;
2858 struct vc_data *vc;
2859 unsigned int currcons = 0, i;
2860
2861 console_lock();
2862
2863 if (conswitchp)
2864 display_desc = conswitchp->con_startup();
2865 if (!display_desc) {
2866 fg_console = 0;
2867 console_unlock();
2868 return 0;
2869 }
2870
2871 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2872 struct con_driver *con_driver = &registered_con_driver[i];
2873
2874 if (con_driver->con == NULL) {
2875 con_driver->con = conswitchp;
2876 con_driver->desc = display_desc;
2877 con_driver->flag = CON_DRIVER_FLAG_INIT;
2878 con_driver->first = 0;
2879 con_driver->last = MAX_NR_CONSOLES - 1;
2880 break;
2881 }
2882 }
2883
2884 for (i = 0; i < MAX_NR_CONSOLES; i++)
2885 con_driver_map[i] = conswitchp;
2886
2887 if (blankinterval) {
2888 blank_state = blank_normal_wait;
2889 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2890 }
2891
2892 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2893 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2894 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2895 tty_port_init(&vc->port);
2896 visual_init(vc, currcons, 1);
2897 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2898 vc_init(vc, vc->vc_rows, vc->vc_cols,
2899 currcons || !vc->vc_sw->con_save_screen);
2900 }
2901 currcons = fg_console = 0;
2902 master_display_fg = vc = vc_cons[currcons].d;
2903 set_origin(vc);
2904 save_screen(vc);
2905 gotoxy(vc, vc->vc_x, vc->vc_y);
2906 csi_J(vc, 0);
2907 update_screen(vc);
2908 pr_info("Console: %s %s %dx%d\n",
2909 vc->vc_can_do_color ? "colour" : "mono",
2910 display_desc, vc->vc_cols, vc->vc_rows);
2911 printable = 1;
2912
2913 console_unlock();
2914
2915 #ifdef CONFIG_VT_CONSOLE
2916 register_console(&vt_console_driver);
2917 #endif
2918 return 0;
2919 }
2920 console_initcall(con_init);
2921
2922 static const struct tty_operations con_ops = {
2923 .install = con_install,
2924 .open = con_open,
2925 .close = con_close,
2926 .write = con_write,
2927 .write_room = con_write_room,
2928 .put_char = con_put_char,
2929 .flush_chars = con_flush_chars,
2930 .chars_in_buffer = con_chars_in_buffer,
2931 .ioctl = vt_ioctl,
2932 #ifdef CONFIG_COMPAT
2933 .compat_ioctl = vt_compat_ioctl,
2934 #endif
2935 .stop = con_stop,
2936 .start = con_start,
2937 .throttle = con_throttle,
2938 .unthrottle = con_unthrottle,
2939 .resize = vt_resize,
2940 .shutdown = con_shutdown
2941 };
2942
2943 static struct cdev vc0_cdev;
2944
2945 static ssize_t show_tty_active(struct device *dev,
2946 struct device_attribute *attr, char *buf)
2947 {
2948 return sprintf(buf, "tty%d\n", fg_console + 1);
2949 }
2950 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2951
2952 int __init vty_init(const struct file_operations *console_fops)
2953 {
2954 cdev_init(&vc0_cdev, console_fops);
2955 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2956 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2957 panic("Couldn't register /dev/tty0 driver\n");
2958 tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2959 if (IS_ERR(tty0dev))
2960 tty0dev = NULL;
2961 else
2962 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2963
2964 vcs_init();
2965
2966 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2967 if (!console_driver)
2968 panic("Couldn't allocate console driver\n");
2969
2970 console_driver->name = "tty";
2971 console_driver->name_base = 1;
2972 console_driver->major = TTY_MAJOR;
2973 console_driver->minor_start = 1;
2974 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2975 console_driver->init_termios = tty_std_termios;
2976 if (default_utf8)
2977 console_driver->init_termios.c_iflag |= IUTF8;
2978 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2979 tty_set_operations(console_driver, &con_ops);
2980 if (tty_register_driver(console_driver))
2981 panic("Couldn't register console driver\n");
2982 kbd_init();
2983 console_map_init();
2984 #ifdef CONFIG_MDA_CONSOLE
2985 mda_console_init();
2986 #endif
2987 return 0;
2988 }
2989
2990 #ifndef VT_SINGLE_DRIVER
2991
2992 static struct class *vtconsole_class;
2993
2994 static int do_bind_con_driver(const struct consw *csw, int first, int last,
2995 int deflt)
2996 {
2997 struct module *owner = csw->owner;
2998 const char *desc = NULL;
2999 struct con_driver *con_driver;
3000 int i, j = -1, k = -1, retval = -ENODEV;
3001
3002 if (!try_module_get(owner))
3003 return -ENODEV;
3004
3005 WARN_CONSOLE_UNLOCKED();
3006
3007 /* check if driver is registered */
3008 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3009 con_driver = &registered_con_driver[i];
3010
3011 if (con_driver->con == csw) {
3012 desc = con_driver->desc;
3013 retval = 0;
3014 break;
3015 }
3016 }
3017
3018 if (retval)
3019 goto err;
3020
3021 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3022 csw->con_startup();
3023 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3024 }
3025
3026 if (deflt) {
3027 if (conswitchp)
3028 module_put(conswitchp->owner);
3029
3030 __module_get(owner);
3031 conswitchp = csw;
3032 }
3033
3034 first = max(first, con_driver->first);
3035 last = min(last, con_driver->last);
3036
3037 for (i = first; i <= last; i++) {
3038 int old_was_color;
3039 struct vc_data *vc = vc_cons[i].d;
3040
3041 if (con_driver_map[i])
3042 module_put(con_driver_map[i]->owner);
3043 __module_get(owner);
3044 con_driver_map[i] = csw;
3045
3046 if (!vc || !vc->vc_sw)
3047 continue;
3048
3049 j = i;
3050
3051 if (CON_IS_VISIBLE(vc)) {
3052 k = i;
3053 save_screen(vc);
3054 }
3055
3056 old_was_color = vc->vc_can_do_color;
3057 vc->vc_sw->con_deinit(vc);
3058 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3059 visual_init(vc, i, 0);
3060 set_origin(vc);
3061 update_attr(vc);
3062
3063 /* If the console changed between mono <-> color, then
3064 * the attributes in the screenbuf will be wrong. The
3065 * following resets all attributes to something sane.
3066 */
3067 if (old_was_color != vc->vc_can_do_color)
3068 clear_buffer_attributes(vc);
3069 }
3070
3071 pr_info("Console: switching ");
3072 if (!deflt)
3073 printk("consoles %d-%d ", first+1, last+1);
3074 if (j >= 0) {
3075 struct vc_data *vc = vc_cons[j].d;
3076
3077 printk("to %s %s %dx%d\n",
3078 vc->vc_can_do_color ? "colour" : "mono",
3079 desc, vc->vc_cols, vc->vc_rows);
3080
3081 if (k >= 0) {
3082 vc = vc_cons[k].d;
3083 update_screen(vc);
3084 }
3085 } else
3086 printk("to %s\n", desc);
3087
3088 retval = 0;
3089 err:
3090 module_put(owner);
3091 return retval;
3092 };
3093
3094
3095 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3096 static int con_is_graphics(const struct consw *csw, int first, int last)
3097 {
3098 int i, retval = 0;
3099
3100 for (i = first; i <= last; i++) {
3101 struct vc_data *vc = vc_cons[i].d;
3102
3103 if (vc && vc->vc_mode == KD_GRAPHICS) {
3104 retval = 1;
3105 break;
3106 }
3107 }
3108
3109 return retval;
3110 }
3111
3112 /* unlocked version of unbind_con_driver() */
3113 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3114 {
3115 struct module *owner = csw->owner;
3116 const struct consw *defcsw = NULL;
3117 struct con_driver *con_driver = NULL, *con_back = NULL;
3118 int i, retval = -ENODEV;
3119
3120 if (!try_module_get(owner))
3121 return -ENODEV;
3122
3123 WARN_CONSOLE_UNLOCKED();
3124
3125 /* check if driver is registered and if it is unbindable */
3126 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3127 con_driver = &registered_con_driver[i];
3128
3129 if (con_driver->con == csw &&
3130 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3131 retval = 0;
3132 break;
3133 }
3134 }
3135
3136 if (retval)
3137 goto err;
3138
3139 retval = -ENODEV;
3140
3141 /* check if backup driver exists */
3142 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3143 con_back = &registered_con_driver[i];
3144
3145 if (con_back->con &&
3146 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3147 defcsw = con_back->con;
3148 retval = 0;
3149 break;
3150 }
3151 }
3152
3153 if (retval)
3154 goto err;
3155
3156 if (!con_is_bound(csw))
3157 goto err;
3158
3159 first = max(first, con_driver->first);
3160 last = min(last, con_driver->last);
3161
3162 for (i = first; i <= last; i++) {
3163 if (con_driver_map[i] == csw) {
3164 module_put(csw->owner);
3165 con_driver_map[i] = NULL;
3166 }
3167 }
3168
3169 if (!con_is_bound(defcsw)) {
3170 const struct consw *defconsw = conswitchp;
3171
3172 defcsw->con_startup();
3173 con_back->flag |= CON_DRIVER_FLAG_INIT;
3174 /*
3175 * vgacon may change the default driver to point
3176 * to dummycon, we restore it here...
3177 */
3178 conswitchp = defconsw;
3179 }
3180
3181 if (!con_is_bound(csw))
3182 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3183
3184 /* ignore return value, binding should not fail */
3185 do_bind_con_driver(defcsw, first, last, deflt);
3186 err:
3187 module_put(owner);
3188 return retval;
3189
3190 }
3191 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3192
3193 static int vt_bind(struct con_driver *con)
3194 {
3195 const struct consw *defcsw = NULL, *csw = NULL;
3196 int i, more = 1, first = -1, last = -1, deflt = 0;
3197
3198 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3199 con_is_graphics(con->con, con->first, con->last))
3200 goto err;
3201
3202 csw = con->con;
3203
3204 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3205 struct con_driver *con = &registered_con_driver[i];
3206
3207 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3208 defcsw = con->con;
3209 break;
3210 }
3211 }
3212
3213 if (!defcsw)
3214 goto err;
3215
3216 while (more) {
3217 more = 0;
3218
3219 for (i = con->first; i <= con->last; i++) {
3220 if (con_driver_map[i] == defcsw) {
3221 if (first == -1)
3222 first = i;
3223 last = i;
3224 more = 1;
3225 } else if (first != -1)
3226 break;
3227 }
3228
3229 if (first == 0 && last == MAX_NR_CONSOLES -1)
3230 deflt = 1;
3231
3232 if (first != -1) {
3233 console_lock();
3234 do_bind_con_driver(csw, first, last, deflt);
3235 console_unlock();
3236 }
3237
3238 first = -1;
3239 last = -1;
3240 deflt = 0;
3241 }
3242
3243 err:
3244 return 0;
3245 }
3246
3247 static int vt_unbind(struct con_driver *con)
3248 {
3249 const struct consw *csw = NULL;
3250 int i, more = 1, first = -1, last = -1, deflt = 0;
3251
3252 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3253 con_is_graphics(con->con, con->first, con->last))
3254 goto err;
3255
3256 csw = con->con;
3257
3258 while (more) {
3259 more = 0;
3260
3261 for (i = con->first; i <= con->last; i++) {
3262 if (con_driver_map[i] == csw) {
3263 if (first == -1)
3264 first = i;
3265 last = i;
3266 more = 1;
3267 } else if (first != -1)
3268 break;
3269 }
3270
3271 if (first == 0 && last == MAX_NR_CONSOLES -1)
3272 deflt = 1;
3273
3274 if (first != -1) {
3275 console_lock();
3276 do_unbind_con_driver(csw, first, last, deflt);
3277 console_unlock();
3278 }
3279
3280 first = -1;
3281 last = -1;
3282 deflt = 0;
3283 }
3284
3285 err:
3286 return 0;
3287 }
3288 #else
3289 static inline int vt_bind(struct con_driver *con)
3290 {
3291 return 0;
3292 }
3293 static inline int vt_unbind(struct con_driver *con)
3294 {
3295 return 0;
3296 }
3297 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3298
3299 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3300 const char *buf, size_t count)
3301 {
3302 struct con_driver *con = dev_get_drvdata(dev);
3303 int bind = simple_strtoul(buf, NULL, 0);
3304
3305 if (bind)
3306 vt_bind(con);
3307 else
3308 vt_unbind(con);
3309
3310 return count;
3311 }
3312
3313 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3314 char *buf)
3315 {
3316 struct con_driver *con = dev_get_drvdata(dev);
3317 int bind = con_is_bound(con->con);
3318
3319 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3320 }
3321
3322 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3323 char *buf)
3324 {
3325 struct con_driver *con = dev_get_drvdata(dev);
3326
3327 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3328 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3329 con->desc);
3330
3331 }
3332
3333 static struct device_attribute device_attrs[] = {
3334 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3335 __ATTR(name, S_IRUGO, show_name, NULL),
3336 };
3337
3338 static int vtconsole_init_device(struct con_driver *con)
3339 {
3340 int i;
3341 int error = 0;
3342
3343 con->flag |= CON_DRIVER_FLAG_ATTR;
3344 dev_set_drvdata(con->dev, con);
3345 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3346 error = device_create_file(con->dev, &device_attrs[i]);
3347 if (error)
3348 break;
3349 }
3350
3351 if (error) {
3352 while (--i >= 0)
3353 device_remove_file(con->dev, &device_attrs[i]);
3354 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3355 }
3356
3357 return error;
3358 }
3359
3360 static void vtconsole_deinit_device(struct con_driver *con)
3361 {
3362 int i;
3363
3364 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3365 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3366 device_remove_file(con->dev, &device_attrs[i]);
3367 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3368 }
3369 }
3370
3371 /**
3372 * con_is_bound - checks if driver is bound to the console
3373 * @csw: console driver
3374 *
3375 * RETURNS: zero if unbound, nonzero if bound
3376 *
3377 * Drivers can call this and if zero, they should release
3378 * all resources allocated on con_startup()
3379 */
3380 int con_is_bound(const struct consw *csw)
3381 {
3382 int i, bound = 0;
3383
3384 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3385 if (con_driver_map[i] == csw) {
3386 bound = 1;
3387 break;
3388 }
3389 }
3390
3391 return bound;
3392 }
3393 EXPORT_SYMBOL(con_is_bound);
3394
3395 /**
3396 * con_debug_enter - prepare the console for the kernel debugger
3397 * @sw: console driver
3398 *
3399 * Called when the console is taken over by the kernel debugger, this
3400 * function needs to save the current console state, then put the console
3401 * into a state suitable for the kernel debugger.
3402 *
3403 * RETURNS:
3404 * Zero on success, nonzero if a failure occurred when trying to prepare
3405 * the console for the debugger.
3406 */
3407 int con_debug_enter(struct vc_data *vc)
3408 {
3409 int ret = 0;
3410
3411 saved_fg_console = fg_console;
3412 saved_last_console = last_console;
3413 saved_want_console = want_console;
3414 saved_vc_mode = vc->vc_mode;
3415 saved_console_blanked = console_blanked;
3416 vc->vc_mode = KD_TEXT;
3417 console_blanked = 0;
3418 if (vc->vc_sw->con_debug_enter)
3419 ret = vc->vc_sw->con_debug_enter(vc);
3420 #ifdef CONFIG_KGDB_KDB
3421 /* Set the initial LINES variable if it is not already set */
3422 if (vc->vc_rows < 999) {
3423 int linecount;
3424 char lns[4];
3425 const char *setargs[3] = {
3426 "set",
3427 "LINES",
3428 lns,
3429 };
3430 if (kdbgetintenv(setargs[0], &linecount)) {
3431 snprintf(lns, 4, "%i", vc->vc_rows);
3432 kdb_set(2, setargs);
3433 }
3434 }
3435 if (vc->vc_cols < 999) {
3436 int colcount;
3437 char cols[4];
3438 const char *setargs[3] = {
3439 "set",
3440 "COLUMNS",
3441 cols,
3442 };
3443 if (kdbgetintenv(setargs[0], &colcount)) {
3444 snprintf(cols, 4, "%i", vc->vc_cols);
3445 kdb_set(2, setargs);
3446 }
3447 }
3448 #endif /* CONFIG_KGDB_KDB */
3449 return ret;
3450 }
3451 EXPORT_SYMBOL_GPL(con_debug_enter);
3452
3453 /**
3454 * con_debug_leave - restore console state
3455 * @sw: console driver
3456 *
3457 * Restore the console state to what it was before the kernel debugger
3458 * was invoked.
3459 *
3460 * RETURNS:
3461 * Zero on success, nonzero if a failure occurred when trying to restore
3462 * the console.
3463 */
3464 int con_debug_leave(void)
3465 {
3466 struct vc_data *vc;
3467 int ret = 0;
3468
3469 fg_console = saved_fg_console;
3470 last_console = saved_last_console;
3471 want_console = saved_want_console;
3472 console_blanked = saved_console_blanked;
3473 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3474
3475 vc = vc_cons[fg_console].d;
3476 if (vc->vc_sw->con_debug_leave)
3477 ret = vc->vc_sw->con_debug_leave(vc);
3478 return ret;
3479 }
3480 EXPORT_SYMBOL_GPL(con_debug_leave);
3481
3482 static int do_register_con_driver(const struct consw *csw, int first, int last)
3483 {
3484 struct module *owner = csw->owner;
3485 struct con_driver *con_driver;
3486 const char *desc;
3487 int i, retval = 0;
3488
3489 WARN_CONSOLE_UNLOCKED();
3490
3491 if (!try_module_get(owner))
3492 return -ENODEV;
3493
3494 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3495 con_driver = &registered_con_driver[i];
3496
3497 /* already registered */
3498 if (con_driver->con == csw)
3499 retval = -EBUSY;
3500 }
3501
3502 if (retval)
3503 goto err;
3504
3505 desc = csw->con_startup();
3506 if (!desc) {
3507 retval = -ENODEV;
3508 goto err;
3509 }
3510
3511 retval = -EINVAL;
3512
3513 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3514 con_driver = &registered_con_driver[i];
3515
3516 if (con_driver->con == NULL) {
3517 con_driver->con = csw;
3518 con_driver->desc = desc;
3519 con_driver->node = i;
3520 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3521 CON_DRIVER_FLAG_INIT;
3522 con_driver->first = first;
3523 con_driver->last = last;
3524 retval = 0;
3525 break;
3526 }
3527 }
3528
3529 if (retval)
3530 goto err;
3531
3532 con_driver->dev = device_create(vtconsole_class, NULL,
3533 MKDEV(0, con_driver->node),
3534 NULL, "vtcon%i",
3535 con_driver->node);
3536
3537 if (IS_ERR(con_driver->dev)) {
3538 printk(KERN_WARNING "Unable to create device for %s; "
3539 "errno = %ld\n", con_driver->desc,
3540 PTR_ERR(con_driver->dev));
3541 con_driver->dev = NULL;
3542 } else {
3543 vtconsole_init_device(con_driver);
3544 }
3545
3546 err:
3547 module_put(owner);
3548 return retval;
3549 }
3550
3551
3552 /**
3553 * do_unregister_con_driver - unregister console driver from console layer
3554 * @csw: console driver
3555 *
3556 * DESCRIPTION: All drivers that registers to the console layer must
3557 * call this function upon exit, or if the console driver is in a state
3558 * where it won't be able to handle console services, such as the
3559 * framebuffer console without loaded framebuffer drivers.
3560 *
3561 * The driver must unbind first prior to unregistration.
3562 */
3563 int do_unregister_con_driver(const struct consw *csw)
3564 {
3565 int i, retval = -ENODEV;
3566
3567 /* cannot unregister a bound driver */
3568 if (con_is_bound(csw))
3569 goto err;
3570
3571 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3572 struct con_driver *con_driver = &registered_con_driver[i];
3573
3574 if (con_driver->con == csw &&
3575 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3576 vtconsole_deinit_device(con_driver);
3577 device_destroy(vtconsole_class,
3578 MKDEV(0, con_driver->node));
3579 con_driver->con = NULL;
3580 con_driver->desc = NULL;
3581 con_driver->dev = NULL;
3582 con_driver->node = 0;
3583 con_driver->flag = 0;
3584 con_driver->first = 0;
3585 con_driver->last = 0;
3586 retval = 0;
3587 break;
3588 }
3589 }
3590 err:
3591 return retval;
3592 }
3593 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3594
3595 /*
3596 * If we support more console drivers, this function is used
3597 * when a driver wants to take over some existing consoles
3598 * and become default driver for newly opened ones.
3599 *
3600 * do_take_over_console is basically a register followed by unbind
3601 */
3602 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3603 {
3604 int err;
3605
3606 err = do_register_con_driver(csw, first, last);
3607 /*
3608 * If we get an busy error we still want to bind the console driver
3609 * and return success, as we may have unbound the console driver
3610 * but not unregistered it.
3611 */
3612 if (err == -EBUSY)
3613 err = 0;
3614 if (!err)
3615 do_bind_con_driver(csw, first, last, deflt);
3616
3617 return err;
3618 }
3619 EXPORT_SYMBOL_GPL(do_take_over_console);
3620
3621
3622 /*
3623 * give_up_console is a wrapper to unregister_con_driver. It will only
3624 * work if driver is fully unbound.
3625 */
3626 void give_up_console(const struct consw *csw)
3627 {
3628 console_lock();
3629 do_unregister_con_driver(csw);
3630 console_unlock();
3631 }
3632
3633 static int __init vtconsole_class_init(void)
3634 {
3635 int i;
3636
3637 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3638 if (IS_ERR(vtconsole_class)) {
3639 printk(KERN_WARNING "Unable to create vt console class; "
3640 "errno = %ld\n", PTR_ERR(vtconsole_class));
3641 vtconsole_class = NULL;
3642 }
3643
3644 /* Add system drivers to sysfs */
3645 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3646 struct con_driver *con = &registered_con_driver[i];
3647
3648 if (con->con && !con->dev) {
3649 con->dev = device_create(vtconsole_class, NULL,
3650 MKDEV(0, con->node),
3651 NULL, "vtcon%i",
3652 con->node);
3653
3654 if (IS_ERR(con->dev)) {
3655 printk(KERN_WARNING "Unable to create "
3656 "device for %s; errno = %ld\n",
3657 con->desc, PTR_ERR(con->dev));
3658 con->dev = NULL;
3659 } else {
3660 vtconsole_init_device(con);
3661 }
3662 }
3663 }
3664
3665 return 0;
3666 }
3667 postcore_initcall(vtconsole_class_init);
3668
3669 #endif
3670
3671 /*
3672 * Screen blanking
3673 */
3674
3675 static int set_vesa_blanking(char __user *p)
3676 {
3677 unsigned int mode;
3678
3679 if (get_user(mode, p + 1))
3680 return -EFAULT;
3681
3682 vesa_blank_mode = (mode < 4) ? mode : 0;
3683 return 0;
3684 }
3685
3686 void do_blank_screen(int entering_gfx)
3687 {
3688 struct vc_data *vc = vc_cons[fg_console].d;
3689 int i;
3690
3691 WARN_CONSOLE_UNLOCKED();
3692
3693 if (console_blanked) {
3694 if (blank_state == blank_vesa_wait) {
3695 blank_state = blank_off;
3696 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3697 }
3698 return;
3699 }
3700
3701 /* entering graphics mode? */
3702 if (entering_gfx) {
3703 hide_cursor(vc);
3704 save_screen(vc);
3705 vc->vc_sw->con_blank(vc, -1, 1);
3706 console_blanked = fg_console + 1;
3707 blank_state = blank_off;
3708 set_origin(vc);
3709 return;
3710 }
3711
3712 if (blank_state != blank_normal_wait)
3713 return;
3714 blank_state = blank_off;
3715
3716 /* don't blank graphics */
3717 if (vc->vc_mode != KD_TEXT) {
3718 console_blanked = fg_console + 1;
3719 return;
3720 }
3721
3722 hide_cursor(vc);
3723 del_timer_sync(&console_timer);
3724 blank_timer_expired = 0;
3725
3726 save_screen(vc);
3727 /* In case we need to reset origin, blanking hook returns 1 */
3728 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3729 console_blanked = fg_console + 1;
3730 if (i)
3731 set_origin(vc);
3732
3733 if (console_blank_hook && console_blank_hook(1))
3734 return;
3735
3736 if (vesa_off_interval && vesa_blank_mode) {
3737 blank_state = blank_vesa_wait;
3738 mod_timer(&console_timer, jiffies + vesa_off_interval);
3739 }
3740 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3741 }
3742 EXPORT_SYMBOL(do_blank_screen);
3743
3744 /*
3745 * Called by timer as well as from vt_console_driver
3746 */
3747 void do_unblank_screen(int leaving_gfx)
3748 {
3749 struct vc_data *vc;
3750
3751 /* This should now always be called from a "sane" (read: can schedule)
3752 * context for the sake of the low level drivers, except in the special
3753 * case of oops_in_progress
3754 */
3755 if (!oops_in_progress)
3756 might_sleep();
3757
3758 WARN_CONSOLE_UNLOCKED();
3759
3760 ignore_poke = 0;
3761 if (!console_blanked)
3762 return;
3763 if (!vc_cons_allocated(fg_console)) {
3764 /* impossible */
3765 pr_warning("unblank_screen: tty %d not allocated ??\n",
3766 fg_console+1);
3767 return;
3768 }
3769 vc = vc_cons[fg_console].d;
3770 /* Try to unblank in oops case too */
3771 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3772 return; /* but leave console_blanked != 0 */
3773
3774 if (blankinterval) {
3775 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3776 blank_state = blank_normal_wait;
3777 }
3778
3779 console_blanked = 0;
3780 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3781 /* Low-level driver cannot restore -> do it ourselves */
3782 update_screen(vc);
3783 if (console_blank_hook)
3784 console_blank_hook(0);
3785 set_palette(vc);
3786 set_cursor(vc);
3787 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3788 }
3789 EXPORT_SYMBOL(do_unblank_screen);
3790
3791 /*
3792 * This is called by the outside world to cause a forced unblank, mostly for
3793 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3794 * call it with 1 as an argument and so force a mode restore... that may kill
3795 * X or at least garbage the screen but would also make the Oops visible...
3796 */
3797 void unblank_screen(void)
3798 {
3799 do_unblank_screen(0);
3800 }
3801
3802 /*
3803 * We defer the timer blanking to work queue so it can take the console mutex
3804 * (console operations can still happen at irq time, but only from printk which
3805 * has the console mutex. Not perfect yet, but better than no locking
3806 */
3807 static void blank_screen_t(unsigned long dummy)
3808 {
3809 if (unlikely(!keventd_up())) {
3810 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3811 return;
3812 }
3813 blank_timer_expired = 1;
3814 schedule_work(&console_work);
3815 }
3816
3817 void poke_blanked_console(void)
3818 {
3819 WARN_CONSOLE_UNLOCKED();
3820
3821 /* Add this so we quickly catch whoever might call us in a non
3822 * safe context. Nowadays, unblank_screen() isn't to be called in
3823 * atomic contexts and is allowed to schedule (with the special case
3824 * of oops_in_progress, but that isn't of any concern for this
3825 * function. --BenH.
3826 */
3827 might_sleep();
3828
3829 /* This isn't perfectly race free, but a race here would be mostly harmless,
3830 * at worse, we'll do a spurrious blank and it's unlikely
3831 */
3832 del_timer(&console_timer);
3833 blank_timer_expired = 0;
3834
3835 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3836 return;
3837 if (console_blanked)
3838 unblank_screen();
3839 else if (blankinterval) {
3840 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3841 blank_state = blank_normal_wait;
3842 }
3843 }
3844
3845 /*
3846 * Palettes
3847 */
3848
3849 static void set_palette(struct vc_data *vc)
3850 {
3851 WARN_CONSOLE_UNLOCKED();
3852
3853 if (vc->vc_mode != KD_GRAPHICS)
3854 vc->vc_sw->con_set_palette(vc, color_table);
3855 }
3856
3857 /*
3858 * Load palette into the DAC registers. arg points to a colour
3859 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3860 */
3861
3862 int con_set_cmap(unsigned char __user *arg)
3863 {
3864 int i, j, k;
3865 unsigned char colormap[3*16];
3866
3867 if (copy_from_user(colormap, arg, sizeof(colormap)))
3868 return -EFAULT;
3869
3870 console_lock();
3871 for (i = k = 0; i < 16; i++) {
3872 default_red[i] = colormap[k++];
3873 default_grn[i] = colormap[k++];
3874 default_blu[i] = colormap[k++];
3875 }
3876 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3877 if (!vc_cons_allocated(i))
3878 continue;
3879 for (j = k = 0; j < 16; j++) {
3880 vc_cons[i].d->vc_palette[k++] = default_red[j];
3881 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3882 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3883 }
3884 set_palette(vc_cons[i].d);
3885 }
3886 console_unlock();
3887
3888 return 0;
3889 }
3890
3891 int con_get_cmap(unsigned char __user *arg)
3892 {
3893 int i, k;
3894 unsigned char colormap[3*16];
3895
3896 console_lock();
3897 for (i = k = 0; i < 16; i++) {
3898 colormap[k++] = default_red[i];
3899 colormap[k++] = default_grn[i];
3900 colormap[k++] = default_blu[i];
3901 }
3902 console_unlock();
3903
3904 if (copy_to_user(arg, colormap, sizeof(colormap)))
3905 return -EFAULT;
3906
3907 return 0;
3908 }
3909
3910 void reset_palette(struct vc_data *vc)
3911 {
3912 int j, k;
3913 for (j=k=0; j<16; j++) {
3914 vc->vc_palette[k++] = default_red[j];
3915 vc->vc_palette[k++] = default_grn[j];
3916 vc->vc_palette[k++] = default_blu[j];
3917 }
3918 set_palette(vc);
3919 }
3920
3921 /*
3922 * Font switching
3923 *
3924 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3925 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3926 * depending on width) reserved for each character which is kinda wasty, but
3927 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3928 * is up to the actual low-level console-driver convert data into its favorite
3929 * format (maybe we should add a `fontoffset' field to the `display'
3930 * structure so we won't have to convert the fontdata all the time.
3931 * /Jes
3932 */
3933
3934 #define max_font_size 65536
3935
3936 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3937 {
3938 struct console_font font;
3939 int rc = -EINVAL;
3940 int c;
3941
3942 if (op->data) {
3943 font.data = kmalloc(max_font_size, GFP_KERNEL);
3944 if (!font.data)
3945 return -ENOMEM;
3946 } else
3947 font.data = NULL;
3948
3949 console_lock();
3950 if (vc->vc_mode != KD_TEXT)
3951 rc = -EINVAL;
3952 else if (vc->vc_sw->con_font_get)
3953 rc = vc->vc_sw->con_font_get(vc, &font);
3954 else
3955 rc = -ENOSYS;
3956 console_unlock();
3957
3958 if (rc)
3959 goto out;
3960
3961 c = (font.width+7)/8 * 32 * font.charcount;
3962
3963 if (op->data && font.charcount > op->charcount)
3964 rc = -ENOSPC;
3965 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3966 if (font.width > op->width || font.height > op->height)
3967 rc = -ENOSPC;
3968 } else {
3969 if (font.width != 8)
3970 rc = -EIO;
3971 else if ((op->height && font.height > op->height) ||
3972 font.height > 32)
3973 rc = -ENOSPC;
3974 }
3975 if (rc)
3976 goto out;
3977
3978 op->height = font.height;
3979 op->width = font.width;
3980 op->charcount = font.charcount;
3981
3982 if (op->data && copy_to_user(op->data, font.data, c))
3983 rc = -EFAULT;
3984
3985 out:
3986 kfree(font.data);
3987 return rc;
3988 }
3989
3990 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3991 {
3992 struct console_font font;
3993 int rc = -EINVAL;
3994 int size;
3995
3996 if (vc->vc_mode != KD_TEXT)
3997 return -EINVAL;
3998 if (!op->data)
3999 return -EINVAL;
4000 if (op->charcount > 512)
4001 return -EINVAL;
4002 if (!op->height) { /* Need to guess font height [compat] */
4003 int h, i;
4004 u8 __user *charmap = op->data;
4005 u8 tmp;
4006
4007 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4008 so that we can get rid of this soon */
4009 if (!(op->flags & KD_FONT_FLAG_OLD))
4010 return -EINVAL;
4011 for (h = 32; h > 0; h--)
4012 for (i = 0; i < op->charcount; i++) {
4013 if (get_user(tmp, &charmap[32*i+h-1]))
4014 return -EFAULT;
4015 if (tmp)
4016 goto nonzero;
4017 }
4018 return -EINVAL;
4019 nonzero:
4020 op->height = h;
4021 }
4022 if (op->width <= 0 || op->width > 32 || op->height > 32)
4023 return -EINVAL;
4024 size = (op->width+7)/8 * 32 * op->charcount;
4025 if (size > max_font_size)
4026 return -ENOSPC;
4027 font.charcount = op->charcount;
4028 font.height = op->height;
4029 font.width = op->width;
4030 font.data = memdup_user(op->data, size);
4031 if (IS_ERR(font.data))
4032 return PTR_ERR(font.data);
4033 console_lock();
4034 if (vc->vc_mode != KD_TEXT)
4035 rc = -EINVAL;
4036 else if (vc->vc_sw->con_font_set)
4037 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4038 else
4039 rc = -ENOSYS;
4040 console_unlock();
4041 kfree(font.data);
4042 return rc;
4043 }
4044
4045 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4046 {
4047 struct console_font font = {.width = op->width, .height = op->height};
4048 char name[MAX_FONT_NAME];
4049 char *s = name;
4050 int rc;
4051
4052
4053 if (!op->data)
4054 s = NULL;
4055 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4056 return -EFAULT;
4057 else
4058 name[MAX_FONT_NAME - 1] = 0;
4059
4060 console_lock();
4061 if (vc->vc_mode != KD_TEXT) {
4062 console_unlock();
4063 return -EINVAL;
4064 }
4065 if (vc->vc_sw->con_font_default)
4066 rc = vc->vc_sw->con_font_default(vc, &font, s);
4067 else
4068 rc = -ENOSYS;
4069 console_unlock();
4070 if (!rc) {
4071 op->width = font.width;
4072 op->height = font.height;
4073 }
4074 return rc;
4075 }
4076
4077 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4078 {
4079 int con = op->height;
4080 int rc;
4081
4082
4083 console_lock();
4084 if (vc->vc_mode != KD_TEXT)
4085 rc = -EINVAL;
4086 else if (!vc->vc_sw->con_font_copy)
4087 rc = -ENOSYS;
4088 else if (con < 0 || !vc_cons_allocated(con))
4089 rc = -ENOTTY;
4090 else if (con == vc->vc_num) /* nothing to do */
4091 rc = 0;
4092 else
4093 rc = vc->vc_sw->con_font_copy(vc, con);
4094 console_unlock();
4095 return rc;
4096 }
4097
4098 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4099 {
4100 switch (op->op) {
4101 case KD_FONT_OP_SET:
4102 return con_font_set(vc, op);
4103 case KD_FONT_OP_GET:
4104 return con_font_get(vc, op);
4105 case KD_FONT_OP_SET_DEFAULT:
4106 return con_font_default(vc, op);
4107 case KD_FONT_OP_COPY:
4108 return con_font_copy(vc, op);
4109 }
4110 return -ENOSYS;
4111 }
4112
4113 /*
4114 * Interface exported to selection and vcs.
4115 */
4116
4117 /* used by selection */
4118 u16 screen_glyph(struct vc_data *vc, int offset)
4119 {
4120 u16 w = scr_readw(screenpos(vc, offset, 1));
4121 u16 c = w & 0xff;
4122
4123 if (w & vc->vc_hi_font_mask)
4124 c |= 0x100;
4125 return c;
4126 }
4127 EXPORT_SYMBOL_GPL(screen_glyph);
4128
4129 /* used by vcs - note the word offset */
4130 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4131 {
4132 return screenpos(vc, 2 * w_offset, viewed);
4133 }
4134
4135 void getconsxy(struct vc_data *vc, unsigned char *p)
4136 {
4137 p[0] = vc->vc_x;
4138 p[1] = vc->vc_y;
4139 }
4140
4141 void putconsxy(struct vc_data *vc, unsigned char *p)
4142 {
4143 hide_cursor(vc);
4144 gotoxy(vc, p[0], p[1]);
4145 set_cursor(vc);
4146 }
4147
4148 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4149 {
4150 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4151 return softcursor_original;
4152 return scr_readw(org);
4153 }
4154
4155 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4156 {
4157 scr_writew(val, org);
4158 if ((unsigned long)org == vc->vc_pos) {
4159 softcursor_original = -1;
4160 add_softcursor(vc);
4161 }
4162 }
4163
4164 void vcs_scr_updated(struct vc_data *vc)
4165 {
4166 notify_update(vc);
4167 }
4168
4169 /*
4170 * Visible symbols for modules
4171 */
4172
4173 EXPORT_SYMBOL(color_table);
4174 EXPORT_SYMBOL(default_red);
4175 EXPORT_SYMBOL(default_grn);
4176 EXPORT_SYMBOL(default_blu);
4177 EXPORT_SYMBOL(update_region);
4178 EXPORT_SYMBOL(redraw_screen);
4179 EXPORT_SYMBOL(vc_resize);
4180 EXPORT_SYMBOL(fg_console);
4181 EXPORT_SYMBOL(console_blank_hook);
4182 EXPORT_SYMBOL(console_blanked);
4183 EXPORT_SYMBOL(vc_cons);
4184 EXPORT_SYMBOL(global_cursor_default);
4185 #ifndef VT_SINGLE_DRIVER
4186 EXPORT_SYMBOL(give_up_console);
4187 #endif
Linux with added FPC-III support