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Linux 4.18.10
[linux/fpc-iii.git] / drivers / tty / vt / vt.c
blob15eb6c829d39c5b108adfca034fa50769763c0bc
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6 /*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
61 * deletion SMP-safe. 17Jun00, Andrew Morton
62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72 */
73
74 #include <linux/module.h>
75 #include <linux/types.h>
76 #include <linux/sched/signal.h>
77 #include <linux/tty.h>
78 #include <linux/tty_flip.h>
79 #include <linux/kernel.h>
80 #include <linux/string.h>
81 #include <linux/errno.h>
82 #include <linux/kd.h>
83 #include <linux/slab.h>
84 #include <linux/major.h>
85 #include <linux/mm.h>
86 #include <linux/console.h>
87 #include <linux/init.h>
88 #include <linux/mutex.h>
89 #include <linux/vt_kern.h>
90 #include <linux/selection.h>
91 #include <linux/tiocl.h>
92 #include <linux/kbd_kern.h>
93 #include <linux/consolemap.h>
94 #include <linux/timer.h>
95 #include <linux/interrupt.h>
96 #include <linux/workqueue.h>
97 #include <linux/pm.h>
98 #include <linux/font.h>
99 #include <linux/bitops.h>
100 #include <linux/notifier.h>
101 #include <linux/device.h>
102 #include <linux/io.h>
103 #include <linux/uaccess.h>
104 #include <linux/kdb.h>
105 #include <linux/ctype.h>
106 #include <linux/bsearch.h>
107
108 #define MAX_NR_CON_DRIVER 16
109
110 #define CON_DRIVER_FLAG_MODULE 1
111 #define CON_DRIVER_FLAG_INIT 2
112 #define CON_DRIVER_FLAG_ATTR 4
113 #define CON_DRIVER_FLAG_ZOMBIE 8
114
115 struct con_driver {
116 const struct consw *con;
117 const char *desc;
118 struct device *dev;
119 int node;
120 int first;
121 int last;
122 int flag;
123 };
124
125 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
126 const struct consw *conswitchp;
127
128 /* A bitmap for codes <32. A bit of 1 indicates that the code
129 * corresponding to that bit number invokes some special action
130 * (such as cursor movement) and should not be displayed as a
131 * glyph unless the disp_ctrl mode is explicitly enabled.
132 */
133 #define CTRL_ACTION 0x0d00ff81
134 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
135
136 /*
137 * Here is the default bell parameters: 750HZ, 1/8th of a second
138 */
139 #define DEFAULT_BELL_PITCH 750
140 #define DEFAULT_BELL_DURATION (HZ/8)
141 #define DEFAULT_CURSOR_BLINK_MS 200
142
143 struct vc vc_cons [MAX_NR_CONSOLES];
144
145 #ifndef VT_SINGLE_DRIVER
146 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
147 #endif
148
149 static int con_open(struct tty_struct *, struct file *);
150 static void vc_init(struct vc_data *vc, unsigned int rows,
151 unsigned int cols, int do_clear);
152 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
153 static void save_cur(struct vc_data *vc);
154 static void reset_terminal(struct vc_data *vc, int do_clear);
155 static void con_flush_chars(struct tty_struct *tty);
156 static int set_vesa_blanking(char __user *p);
157 static void set_cursor(struct vc_data *vc);
158 static void hide_cursor(struct vc_data *vc);
159 static void console_callback(struct work_struct *ignored);
160 static void con_driver_unregister_callback(struct work_struct *ignored);
161 static void blank_screen_t(struct timer_list *unused);
162 static void set_palette(struct vc_data *vc);
163
164 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
165
166 static int printable; /* Is console ready for printing? */
167 int default_utf8 = true;
168 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
169 int global_cursor_default = -1;
170 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
171
172 static int cur_default = CUR_DEFAULT;
173 module_param(cur_default, int, S_IRUGO | S_IWUSR);
174
175 /*
176 * ignore_poke: don't unblank the screen when things are typed. This is
177 * mainly for the privacy of braille terminal users.
178 */
179 static int ignore_poke;
180
181 int do_poke_blanked_console;
182 int console_blanked;
183
184 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
185 static int vesa_off_interval;
186 static int blankinterval;
187 core_param(consoleblank, blankinterval, int, 0444);
188
189 static DECLARE_WORK(console_work, console_callback);
190 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
191
192 /*
193 * fg_console is the current virtual console,
194 * last_console is the last used one,
195 * want_console is the console we want to switch to,
196 * saved_* variants are for save/restore around kernel debugger enter/leave
197 */
198 int fg_console;
199 int last_console;
200 int want_console = -1;
201 static int saved_fg_console;
202 static int saved_last_console;
203 static int saved_want_console;
204 static int saved_vc_mode;
205 static int saved_console_blanked;
206
207 /*
208 * For each existing display, we have a pointer to console currently visible
209 * on that display, allowing consoles other than fg_console to be refreshed
210 * appropriately. Unless the low-level driver supplies its own display_fg
211 * variable, we use this one for the "master display".
212 */
213 static struct vc_data *master_display_fg;
214
215 /*
216 * Unfortunately, we need to delay tty echo when we're currently writing to the
217 * console since the code is (and always was) not re-entrant, so we schedule
218 * all flip requests to process context with schedule-task() and run it from
219 * console_callback().
220 */
221
222 /*
223 * For the same reason, we defer scrollback to the console callback.
224 */
225 static int scrollback_delta;
226
227 /*
228 * Hook so that the power management routines can (un)blank
229 * the console on our behalf.
230 */
231 int (*console_blank_hook)(int);
232
233 static DEFINE_TIMER(console_timer, blank_screen_t);
234 static int blank_state;
235 static int blank_timer_expired;
236 enum {
237 blank_off = 0,
238 blank_normal_wait,
239 blank_vesa_wait,
240 };
241
242 /*
243 * /sys/class/tty/tty0/
244 *
245 * the attribute 'active' contains the name of the current vc
246 * console and it supports poll() to detect vc switches
247 */
248 static struct device *tty0dev;
249
250 /*
251 * Notifier list for console events.
252 */
253 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
254
255 int register_vt_notifier(struct notifier_block *nb)
256 {
257 return atomic_notifier_chain_register(&vt_notifier_list, nb);
258 }
259 EXPORT_SYMBOL_GPL(register_vt_notifier);
260
261 int unregister_vt_notifier(struct notifier_block *nb)
262 {
263 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
264 }
265 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
266
267 static void notify_write(struct vc_data *vc, unsigned int unicode)
268 {
269 struct vt_notifier_param param = { .vc = vc, .c = unicode };
270 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
271 }
272
273 static void notify_update(struct vc_data *vc)
274 {
275 struct vt_notifier_param param = { .vc = vc };
276 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
277 }
278 /*
279 * Low-Level Functions
280 */
281
282 static inline bool con_is_fg(const struct vc_data *vc)
283 {
284 return vc->vc_num == fg_console;
285 }
286
287 static inline bool con_should_update(const struct vc_data *vc)
288 {
289 return con_is_visible(vc) && !console_blanked;
290 }
291
292 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
293 {
294 unsigned short *p;
295
296 if (!viewed)
297 p = (unsigned short *)(vc->vc_origin + offset);
298 else if (!vc->vc_sw->con_screen_pos)
299 p = (unsigned short *)(vc->vc_visible_origin + offset);
300 else
301 p = vc->vc_sw->con_screen_pos(vc, offset);
302 return p;
303 }
304
305 /* Called from the keyboard irq path.. */
306 static inline void scrolldelta(int lines)
307 {
308 /* FIXME */
309 /* scrolldelta needs some kind of consistency lock, but the BKL was
310 and still is not protecting versus the scheduled back end */
311 scrollback_delta += lines;
312 schedule_console_callback();
313 }
314
315 void schedule_console_callback(void)
316 {
317 schedule_work(&console_work);
318 }
319
320 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
321 enum con_scroll dir, unsigned int nr)
322 {
323 u16 *clear, *d, *s;
324
325 if (t + nr >= b)
326 nr = b - t - 1;
327 if (b > vc->vc_rows || t >= b || nr < 1)
328 return;
329 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
330 return;
331
332 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
333 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
334
335 if (dir == SM_UP) {
336 clear = s + (b - t - nr) * vc->vc_cols;
337 swap(s, d);
338 }
339 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
340 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
341 }
342
343 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
344 {
345 unsigned int xx, yy, offset;
346 u16 *p;
347
348 p = (u16 *) start;
349 if (!vc->vc_sw->con_getxy) {
350 offset = (start - vc->vc_origin) / 2;
351 xx = offset % vc->vc_cols;
352 yy = offset / vc->vc_cols;
353 } else {
354 int nxx, nyy;
355 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
356 xx = nxx; yy = nyy;
357 }
358 for(;;) {
359 u16 attrib = scr_readw(p) & 0xff00;
360 int startx = xx;
361 u16 *q = p;
362 while (xx < vc->vc_cols && count) {
363 if (attrib != (scr_readw(p) & 0xff00)) {
364 if (p > q)
365 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
366 startx = xx;
367 q = p;
368 attrib = scr_readw(p) & 0xff00;
369 }
370 p++;
371 xx++;
372 count--;
373 }
374 if (p > q)
375 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
376 if (!count)
377 break;
378 xx = 0;
379 yy++;
380 if (vc->vc_sw->con_getxy) {
381 p = (u16 *)start;
382 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
383 }
384 }
385 }
386
387 void update_region(struct vc_data *vc, unsigned long start, int count)
388 {
389 WARN_CONSOLE_UNLOCKED();
390
391 if (con_should_update(vc)) {
392 hide_cursor(vc);
393 do_update_region(vc, start, count);
394 set_cursor(vc);
395 }
396 }
397
398 /* Structure of attributes is hardware-dependent */
399
400 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
401 u8 _underline, u8 _reverse, u8 _italic)
402 {
403 if (vc->vc_sw->con_build_attr)
404 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
405 _blink, _underline, _reverse, _italic);
406
407 /*
408 * ++roman: I completely changed the attribute format for monochrome
409 * mode (!can_do_color). The formerly used MDA (monochrome display
410 * adapter) format didn't allow the combination of certain effects.
411 * Now the attribute is just a bit vector:
412 * Bit 0..1: intensity (0..2)
413 * Bit 2 : underline
414 * Bit 3 : reverse
415 * Bit 7 : blink
416 */
417 {
418 u8 a = _color;
419 if (!vc->vc_can_do_color)
420 return _intensity |
421 (_italic ? 2 : 0) |
422 (_underline ? 4 : 0) |
423 (_reverse ? 8 : 0) |
424 (_blink ? 0x80 : 0);
425 if (_italic)
426 a = (a & 0xF0) | vc->vc_itcolor;
427 else if (_underline)
428 a = (a & 0xf0) | vc->vc_ulcolor;
429 else if (_intensity == 0)
430 a = (a & 0xf0) | vc->vc_halfcolor;
431 if (_reverse)
432 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
433 if (_blink)
434 a ^= 0x80;
435 if (_intensity == 2)
436 a ^= 0x08;
437 if (vc->vc_hi_font_mask == 0x100)
438 a <<= 1;
439 return a;
440 }
441 }
442
443 static void update_attr(struct vc_data *vc)
444 {
445 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
446 vc->vc_blink, vc->vc_underline,
447 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
448 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
449 }
450
451 /* Note: inverting the screen twice should revert to the original state */
452 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
453 {
454 unsigned short *p;
455
456 WARN_CONSOLE_UNLOCKED();
457
458 count /= 2;
459 p = screenpos(vc, offset, viewed);
460 if (vc->vc_sw->con_invert_region) {
461 vc->vc_sw->con_invert_region(vc, p, count);
462 } else {
463 u16 *q = p;
464 int cnt = count;
465 u16 a;
466
467 if (!vc->vc_can_do_color) {
468 while (cnt--) {
469 a = scr_readw(q);
470 a ^= 0x0800;
471 scr_writew(a, q);
472 q++;
473 }
474 } else if (vc->vc_hi_font_mask == 0x100) {
475 while (cnt--) {
476 a = scr_readw(q);
477 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
478 scr_writew(a, q);
479 q++;
480 }
481 } else {
482 while (cnt--) {
483 a = scr_readw(q);
484 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
485 scr_writew(a, q);
486 q++;
487 }
488 }
489 }
490
491 if (con_should_update(vc))
492 do_update_region(vc, (unsigned long) p, count);
493 notify_update(vc);
494 }
495
496 /* used by selection: complement pointer position */
497 void complement_pos(struct vc_data *vc, int offset)
498 {
499 static int old_offset = -1;
500 static unsigned short old;
501 static unsigned short oldx, oldy;
502
503 WARN_CONSOLE_UNLOCKED();
504
505 if (old_offset != -1 && old_offset >= 0 &&
506 old_offset < vc->vc_screenbuf_size) {
507 scr_writew(old, screenpos(vc, old_offset, 1));
508 if (con_should_update(vc))
509 vc->vc_sw->con_putc(vc, old, oldy, oldx);
510 notify_update(vc);
511 }
512
513 old_offset = offset;
514
515 if (offset != -1 && offset >= 0 &&
516 offset < vc->vc_screenbuf_size) {
517 unsigned short new;
518 unsigned short *p;
519 p = screenpos(vc, offset, 1);
520 old = scr_readw(p);
521 new = old ^ vc->vc_complement_mask;
522 scr_writew(new, p);
523 if (con_should_update(vc)) {
524 oldx = (offset >> 1) % vc->vc_cols;
525 oldy = (offset >> 1) / vc->vc_cols;
526 vc->vc_sw->con_putc(vc, new, oldy, oldx);
527 }
528 notify_update(vc);
529 }
530 }
531
532 static void insert_char(struct vc_data *vc, unsigned int nr)
533 {
534 unsigned short *p = (unsigned short *) vc->vc_pos;
535
536 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
537 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
538 vc->vc_need_wrap = 0;
539 if (con_should_update(vc))
540 do_update_region(vc, (unsigned long) p,
541 vc->vc_cols - vc->vc_x);
542 }
543
544 static void delete_char(struct vc_data *vc, unsigned int nr)
545 {
546 unsigned short *p = (unsigned short *) vc->vc_pos;
547
548 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
549 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
550 nr * 2);
551 vc->vc_need_wrap = 0;
552 if (con_should_update(vc))
553 do_update_region(vc, (unsigned long) p,
554 vc->vc_cols - vc->vc_x);
555 }
556
557 static int softcursor_original = -1;
558
559 static void add_softcursor(struct vc_data *vc)
560 {
561 int i = scr_readw((u16 *) vc->vc_pos);
562 u32 type = vc->vc_cursor_type;
563
564 if (! (type & 0x10)) return;
565 if (softcursor_original != -1) return;
566 softcursor_original = i;
567 i |= ((type >> 8) & 0xff00 );
568 i ^= ((type) & 0xff00 );
569 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
570 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
571 scr_writew(i, (u16 *) vc->vc_pos);
572 if (con_should_update(vc))
573 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
574 }
575
576 static void hide_softcursor(struct vc_data *vc)
577 {
578 if (softcursor_original != -1) {
579 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
580 if (con_should_update(vc))
581 vc->vc_sw->con_putc(vc, softcursor_original,
582 vc->vc_y, vc->vc_x);
583 softcursor_original = -1;
584 }
585 }
586
587 static void hide_cursor(struct vc_data *vc)
588 {
589 if (vc == sel_cons)
590 clear_selection();
591 vc->vc_sw->con_cursor(vc, CM_ERASE);
592 hide_softcursor(vc);
593 }
594
595 static void set_cursor(struct vc_data *vc)
596 {
597 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
598 return;
599 if (vc->vc_deccm) {
600 if (vc == sel_cons)
601 clear_selection();
602 add_softcursor(vc);
603 if ((vc->vc_cursor_type & 0x0f) != 1)
604 vc->vc_sw->con_cursor(vc, CM_DRAW);
605 } else
606 hide_cursor(vc);
607 }
608
609 static void set_origin(struct vc_data *vc)
610 {
611 WARN_CONSOLE_UNLOCKED();
612
613 if (!con_is_visible(vc) ||
614 !vc->vc_sw->con_set_origin ||
615 !vc->vc_sw->con_set_origin(vc))
616 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
617 vc->vc_visible_origin = vc->vc_origin;
618 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
619 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
620 }
621
622 static void save_screen(struct vc_data *vc)
623 {
624 WARN_CONSOLE_UNLOCKED();
625
626 if (vc->vc_sw->con_save_screen)
627 vc->vc_sw->con_save_screen(vc);
628 }
629
630 static void flush_scrollback(struct vc_data *vc)
631 {
632 WARN_CONSOLE_UNLOCKED();
633
634 if (vc->vc_sw->con_flush_scrollback)
635 vc->vc_sw->con_flush_scrollback(vc);
636 }
637
638 /*
639 * Redrawing of screen
640 */
641
642 void clear_buffer_attributes(struct vc_data *vc)
643 {
644 unsigned short *p = (unsigned short *)vc->vc_origin;
645 int count = vc->vc_screenbuf_size / 2;
646 int mask = vc->vc_hi_font_mask | 0xff;
647
648 for (; count > 0; count--, p++) {
649 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
650 }
651 }
652
653 void redraw_screen(struct vc_data *vc, int is_switch)
654 {
655 int redraw = 0;
656
657 WARN_CONSOLE_UNLOCKED();
658
659 if (!vc) {
660 /* strange ... */
661 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
662 return;
663 }
664
665 if (is_switch) {
666 struct vc_data *old_vc = vc_cons[fg_console].d;
667 if (old_vc == vc)
668 return;
669 if (!con_is_visible(vc))
670 redraw = 1;
671 *vc->vc_display_fg = vc;
672 fg_console = vc->vc_num;
673 hide_cursor(old_vc);
674 if (!con_is_visible(old_vc)) {
675 save_screen(old_vc);
676 set_origin(old_vc);
677 }
678 if (tty0dev)
679 sysfs_notify(&tty0dev->kobj, NULL, "active");
680 } else {
681 hide_cursor(vc);
682 redraw = 1;
683 }
684
685 if (redraw) {
686 int update;
687 int old_was_color = vc->vc_can_do_color;
688
689 set_origin(vc);
690 update = vc->vc_sw->con_switch(vc);
691 set_palette(vc);
692 /*
693 * If console changed from mono<->color, the best we can do
694 * is to clear the buffer attributes. As it currently stands,
695 * rebuilding new attributes from the old buffer is not doable
696 * without overly complex code.
697 */
698 if (old_was_color != vc->vc_can_do_color) {
699 update_attr(vc);
700 clear_buffer_attributes(vc);
701 }
702
703 /* Forcibly update if we're panicing */
704 if ((update && vc->vc_mode != KD_GRAPHICS) ||
705 vt_force_oops_output(vc))
706 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
707 }
708 set_cursor(vc);
709 if (is_switch) {
710 set_leds();
711 compute_shiftstate();
712 notify_update(vc);
713 }
714 }
715
716 /*
717 * Allocation, freeing and resizing of VTs.
718 */
719
720 int vc_cons_allocated(unsigned int i)
721 {
722 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
723 }
724
725 static void visual_init(struct vc_data *vc, int num, int init)
726 {
727 /* ++Geert: vc->vc_sw->con_init determines console size */
728 if (vc->vc_sw)
729 module_put(vc->vc_sw->owner);
730 vc->vc_sw = conswitchp;
731 #ifndef VT_SINGLE_DRIVER
732 if (con_driver_map[num])
733 vc->vc_sw = con_driver_map[num];
734 #endif
735 __module_get(vc->vc_sw->owner);
736 vc->vc_num = num;
737 vc->vc_display_fg = &master_display_fg;
738 if (vc->vc_uni_pagedir_loc)
739 con_free_unimap(vc);
740 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
741 vc->vc_uni_pagedir = NULL;
742 vc->vc_hi_font_mask = 0;
743 vc->vc_complement_mask = 0;
744 vc->vc_can_do_color = 0;
745 vc->vc_panic_force_write = false;
746 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
747 vc->vc_sw->con_init(vc, init);
748 if (!vc->vc_complement_mask)
749 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
750 vc->vc_s_complement_mask = vc->vc_complement_mask;
751 vc->vc_size_row = vc->vc_cols << 1;
752 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
753 }
754
755 int vc_allocate(unsigned int currcons) /* return 0 on success */
756 {
757 struct vt_notifier_param param;
758 struct vc_data *vc;
759
760 WARN_CONSOLE_UNLOCKED();
761
762 if (currcons >= MAX_NR_CONSOLES)
763 return -ENXIO;
764
765 if (vc_cons[currcons].d)
766 return 0;
767
768 /* due to the granularity of kmalloc, we waste some memory here */
769 /* the alloc is done in two steps, to optimize the common situation
770 of a 25x80 console (structsize=216, screenbuf_size=4000) */
771 /* although the numbers above are not valid since long ago, the
772 point is still up-to-date and the comment still has its value
773 even if only as a historical artifact. --mj, July 1998 */
774 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
775 if (!vc)
776 return -ENOMEM;
777
778 vc_cons[currcons].d = vc;
779 tty_port_init(&vc->port);
780 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
781
782 visual_init(vc, currcons, 1);
783
784 if (!*vc->vc_uni_pagedir_loc)
785 con_set_default_unimap(vc);
786
787 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
788 if (!vc->vc_screenbuf)
789 goto err_free;
790
791 /* If no drivers have overridden us and the user didn't pass a
792 boot option, default to displaying the cursor */
793 if (global_cursor_default == -1)
794 global_cursor_default = 1;
795
796 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
797 vcs_make_sysfs(currcons);
798 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
799
800 return 0;
801 err_free:
802 kfree(vc);
803 vc_cons[currcons].d = NULL;
804 return -ENOMEM;
805 }
806
807 static inline int resize_screen(struct vc_data *vc, int width, int height,
808 int user)
809 {
810 /* Resizes the resolution of the display adapater */
811 int err = 0;
812
813 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
814 err = vc->vc_sw->con_resize(vc, width, height, user);
815
816 return err;
817 }
818
819 /*
820 * Change # of rows and columns (0 means unchanged/the size of fg_console)
821 * [this is to be used together with some user program
822 * like resize that changes the hardware videomode]
823 */
824 #define VC_RESIZE_MAXCOL (32767)
825 #define VC_RESIZE_MAXROW (32767)
826
827 /**
828 * vc_do_resize - resizing method for the tty
829 * @tty: tty being resized
830 * @real_tty: real tty (different to tty if a pty/tty pair)
831 * @vc: virtual console private data
832 * @cols: columns
833 * @lines: lines
834 *
835 * Resize a virtual console, clipping according to the actual constraints.
836 * If the caller passes a tty structure then update the termios winsize
837 * information and perform any necessary signal handling.
838 *
839 * Caller must hold the console semaphore. Takes the termios rwsem and
840 * ctrl_lock of the tty IFF a tty is passed.
841 */
842
843 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
844 unsigned int cols, unsigned int lines)
845 {
846 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
847 unsigned long end;
848 unsigned int old_rows, old_row_size;
849 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
850 unsigned int user;
851 unsigned short *newscreen;
852
853 WARN_CONSOLE_UNLOCKED();
854
855 if (!vc)
856 return -ENXIO;
857
858 user = vc->vc_resize_user;
859 vc->vc_resize_user = 0;
860
861 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
862 return -EINVAL;
863
864 new_cols = (cols ? cols : vc->vc_cols);
865 new_rows = (lines ? lines : vc->vc_rows);
866 new_row_size = new_cols << 1;
867 new_screen_size = new_row_size * new_rows;
868
869 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
870 return 0;
871
872 if (new_screen_size > (4 << 20))
873 return -EINVAL;
874 newscreen = kzalloc(new_screen_size, GFP_USER);
875 if (!newscreen)
876 return -ENOMEM;
877
878 if (vc == sel_cons)
879 clear_selection();
880
881 old_rows = vc->vc_rows;
882 old_row_size = vc->vc_size_row;
883
884 err = resize_screen(vc, new_cols, new_rows, user);
885 if (err) {
886 kfree(newscreen);
887 return err;
888 }
889
890 vc->vc_rows = new_rows;
891 vc->vc_cols = new_cols;
892 vc->vc_size_row = new_row_size;
893 vc->vc_screenbuf_size = new_screen_size;
894
895 rlth = min(old_row_size, new_row_size);
896 rrem = new_row_size - rlth;
897 old_origin = vc->vc_origin;
898 new_origin = (long) newscreen;
899 new_scr_end = new_origin + new_screen_size;
900
901 if (vc->vc_y > new_rows) {
902 if (old_rows - vc->vc_y < new_rows) {
903 /*
904 * Cursor near the bottom, copy contents from the
905 * bottom of buffer
906 */
907 old_origin += (old_rows - new_rows) * old_row_size;
908 } else {
909 /*
910 * Cursor is in no man's land, copy 1/2 screenful
911 * from the top and bottom of cursor position
912 */
913 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
914 }
915 }
916
917 end = old_origin + old_row_size * min(old_rows, new_rows);
918
919 update_attr(vc);
920
921 while (old_origin < end) {
922 scr_memcpyw((unsigned short *) new_origin,
923 (unsigned short *) old_origin, rlth);
924 if (rrem)
925 scr_memsetw((void *)(new_origin + rlth),
926 vc->vc_video_erase_char, rrem);
927 old_origin += old_row_size;
928 new_origin += new_row_size;
929 }
930 if (new_scr_end > new_origin)
931 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
932 new_scr_end - new_origin);
933 kfree(vc->vc_screenbuf);
934 vc->vc_screenbuf = newscreen;
935 vc->vc_screenbuf_size = new_screen_size;
936 set_origin(vc);
937
938 /* do part of a reset_terminal() */
939 vc->vc_top = 0;
940 vc->vc_bottom = vc->vc_rows;
941 gotoxy(vc, vc->vc_x, vc->vc_y);
942 save_cur(vc);
943
944 if (tty) {
945 /* Rewrite the requested winsize data with the actual
946 resulting sizes */
947 struct winsize ws;
948 memset(&ws, 0, sizeof(ws));
949 ws.ws_row = vc->vc_rows;
950 ws.ws_col = vc->vc_cols;
951 ws.ws_ypixel = vc->vc_scan_lines;
952 tty_do_resize(tty, &ws);
953 }
954
955 if (con_is_visible(vc))
956 update_screen(vc);
957 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
958 return err;
959 }
960
961 /**
962 * vc_resize - resize a VT
963 * @vc: virtual console
964 * @cols: columns
965 * @rows: rows
966 *
967 * Resize a virtual console as seen from the console end of things. We
968 * use the common vc_do_resize methods to update the structures. The
969 * caller must hold the console sem to protect console internals and
970 * vc->port.tty
971 */
972
973 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
974 {
975 return vc_do_resize(vc->port.tty, vc, cols, rows);
976 }
977
978 /**
979 * vt_resize - resize a VT
980 * @tty: tty to resize
981 * @ws: winsize attributes
982 *
983 * Resize a virtual terminal. This is called by the tty layer as we
984 * register our own handler for resizing. The mutual helper does all
985 * the actual work.
986 *
987 * Takes the console sem and the called methods then take the tty
988 * termios_rwsem and the tty ctrl_lock in that order.
989 */
990 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
991 {
992 struct vc_data *vc = tty->driver_data;
993 int ret;
994
995 console_lock();
996 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
997 console_unlock();
998 return ret;
999 }
1000
1001 struct vc_data *vc_deallocate(unsigned int currcons)
1002 {
1003 struct vc_data *vc = NULL;
1004
1005 WARN_CONSOLE_UNLOCKED();
1006
1007 if (vc_cons_allocated(currcons)) {
1008 struct vt_notifier_param param;
1009
1010 param.vc = vc = vc_cons[currcons].d;
1011 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1012 vcs_remove_sysfs(currcons);
1013 vc->vc_sw->con_deinit(vc);
1014 put_pid(vc->vt_pid);
1015 module_put(vc->vc_sw->owner);
1016 kfree(vc->vc_screenbuf);
1017 vc_cons[currcons].d = NULL;
1018 }
1019 return vc;
1020 }
1021
1022 /*
1023 * VT102 emulator
1024 */
1025
1026 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1027 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1028 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1029
1030 #define decarm VC_REPEAT
1031 #define decckm VC_CKMODE
1032 #define kbdapplic VC_APPLIC
1033 #define lnm VC_CRLF
1034
1035 /*
1036 * this is what the terminal answers to a ESC-Z or csi0c query.
1037 */
1038 #define VT100ID "\033[?1;2c"
1039 #define VT102ID "\033[?6c"
1040
1041 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1042 8,12,10,14, 9,13,11,15 };
1043
1044 /* the default colour table, for VGA+ colour systems */
1045 unsigned char default_red[] = {
1046 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1047 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1048 };
1049 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1050
1051 unsigned char default_grn[] = {
1052 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1053 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1054 };
1055 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1056
1057 unsigned char default_blu[] = {
1058 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1059 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1060 };
1061 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1062
1063 /*
1064 * gotoxy() must verify all boundaries, because the arguments
1065 * might also be negative. If the given position is out of
1066 * bounds, the cursor is placed at the nearest margin.
1067 */
1068 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1069 {
1070 int min_y, max_y;
1071
1072 if (new_x < 0)
1073 vc->vc_x = 0;
1074 else {
1075 if (new_x >= vc->vc_cols)
1076 vc->vc_x = vc->vc_cols - 1;
1077 else
1078 vc->vc_x = new_x;
1079 }
1080
1081 if (vc->vc_decom) {
1082 min_y = vc->vc_top;
1083 max_y = vc->vc_bottom;
1084 } else {
1085 min_y = 0;
1086 max_y = vc->vc_rows;
1087 }
1088 if (new_y < min_y)
1089 vc->vc_y = min_y;
1090 else if (new_y >= max_y)
1091 vc->vc_y = max_y - 1;
1092 else
1093 vc->vc_y = new_y;
1094 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1095 vc->vc_need_wrap = 0;
1096 }
1097
1098 /* for absolute user moves, when decom is set */
1099 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1100 {
1101 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1102 }
1103
1104 void scrollback(struct vc_data *vc)
1105 {
1106 scrolldelta(-(vc->vc_rows / 2));
1107 }
1108
1109 void scrollfront(struct vc_data *vc, int lines)
1110 {
1111 if (!lines)
1112 lines = vc->vc_rows / 2;
1113 scrolldelta(lines);
1114 }
1115
1116 static void lf(struct vc_data *vc)
1117 {
1118 /* don't scroll if above bottom of scrolling region, or
1119 * if below scrolling region
1120 */
1121 if (vc->vc_y + 1 == vc->vc_bottom)
1122 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1123 else if (vc->vc_y < vc->vc_rows - 1) {
1124 vc->vc_y++;
1125 vc->vc_pos += vc->vc_size_row;
1126 }
1127 vc->vc_need_wrap = 0;
1128 notify_write(vc, '\n');
1129 }
1130
1131 static void ri(struct vc_data *vc)
1132 {
1133 /* don't scroll if below top of scrolling region, or
1134 * if above scrolling region
1135 */
1136 if (vc->vc_y == vc->vc_top)
1137 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1138 else if (vc->vc_y > 0) {
1139 vc->vc_y--;
1140 vc->vc_pos -= vc->vc_size_row;
1141 }
1142 vc->vc_need_wrap = 0;
1143 }
1144
1145 static inline void cr(struct vc_data *vc)
1146 {
1147 vc->vc_pos -= vc->vc_x << 1;
1148 vc->vc_need_wrap = vc->vc_x = 0;
1149 notify_write(vc, '\r');
1150 }
1151
1152 static inline void bs(struct vc_data *vc)
1153 {
1154 if (vc->vc_x) {
1155 vc->vc_pos -= 2;
1156 vc->vc_x--;
1157 vc->vc_need_wrap = 0;
1158 notify_write(vc, '\b');
1159 }
1160 }
1161
1162 static inline void del(struct vc_data *vc)
1163 {
1164 /* ignored */
1165 }
1166
1167 static void csi_J(struct vc_data *vc, int vpar)
1168 {
1169 unsigned int count;
1170 unsigned short * start;
1171
1172 switch (vpar) {
1173 case 0: /* erase from cursor to end of display */
1174 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1175 start = (unsigned short *)vc->vc_pos;
1176 break;
1177 case 1: /* erase from start to cursor */
1178 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1179 start = (unsigned short *)vc->vc_origin;
1180 break;
1181 case 2: /* erase whole display */
1182 case 3: /* (and scrollback buffer later) */
1183 count = vc->vc_cols * vc->vc_rows;
1184 start = (unsigned short *)vc->vc_origin;
1185 break;
1186 default:
1187 return;
1188 }
1189 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1190 if (vpar == 3) {
1191 set_origin(vc);
1192 flush_scrollback(vc);
1193 if (con_is_visible(vc))
1194 update_screen(vc);
1195 } else if (con_should_update(vc))
1196 do_update_region(vc, (unsigned long) start, count);
1197 vc->vc_need_wrap = 0;
1198 }
1199
1200 static void csi_K(struct vc_data *vc, int vpar)
1201 {
1202 unsigned int count;
1203 unsigned short * start;
1204
1205 switch (vpar) {
1206 case 0: /* erase from cursor to end of line */
1207 count = vc->vc_cols - vc->vc_x;
1208 start = (unsigned short *)vc->vc_pos;
1209 break;
1210 case 1: /* erase from start of line to cursor */
1211 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1212 count = vc->vc_x + 1;
1213 break;
1214 case 2: /* erase whole line */
1215 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1216 count = vc->vc_cols;
1217 break;
1218 default:
1219 return;
1220 }
1221 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1222 vc->vc_need_wrap = 0;
1223 if (con_should_update(vc))
1224 do_update_region(vc, (unsigned long) start, count);
1225 }
1226
1227 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1228 { /* not vt100? */
1229 int count;
1230
1231 if (!vpar)
1232 vpar++;
1233 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1234
1235 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1236 if (con_should_update(vc))
1237 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1238 vc->vc_need_wrap = 0;
1239 }
1240
1241 static void default_attr(struct vc_data *vc)
1242 {
1243 vc->vc_intensity = 1;
1244 vc->vc_italic = 0;
1245 vc->vc_underline = 0;
1246 vc->vc_reverse = 0;
1247 vc->vc_blink = 0;
1248 vc->vc_color = vc->vc_def_color;
1249 }
1250
1251 struct rgb { u8 r; u8 g; u8 b; };
1252
1253 static void rgb_from_256(int i, struct rgb *c)
1254 {
1255 if (i < 8) { /* Standard colours. */
1256 c->r = i&1 ? 0xaa : 0x00;
1257 c->g = i&2 ? 0xaa : 0x00;
1258 c->b = i&4 ? 0xaa : 0x00;
1259 } else if (i < 16) {
1260 c->r = i&1 ? 0xff : 0x55;
1261 c->g = i&2 ? 0xff : 0x55;
1262 c->b = i&4 ? 0xff : 0x55;
1263 } else if (i < 232) { /* 6x6x6 colour cube. */
1264 c->r = (i - 16) / 36 * 85 / 2;
1265 c->g = (i - 16) / 6 % 6 * 85 / 2;
1266 c->b = (i - 16) % 6 * 85 / 2;
1267 } else /* Grayscale ramp. */
1268 c->r = c->g = c->b = i * 10 - 2312;
1269 }
1270
1271 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1272 {
1273 u8 hue = 0, max = max3(c->r, c->g, c->b);
1274
1275 if (c->r > max / 2)
1276 hue |= 4;
1277 if (c->g > max / 2)
1278 hue |= 2;
1279 if (c->b > max / 2)
1280 hue |= 1;
1281
1282 if (hue == 7 && max <= 0x55) {
1283 hue = 0;
1284 vc->vc_intensity = 2;
1285 } else if (max > 0xaa)
1286 vc->vc_intensity = 2;
1287 else
1288 vc->vc_intensity = 1;
1289
1290 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1291 }
1292
1293 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1294 {
1295 /* For backgrounds, err on the dark side. */
1296 vc->vc_color = (vc->vc_color & 0x0f)
1297 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1298 }
1299
1300 /*
1301 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1302 * and thus need to be detected and ignored by hand. Strictly speaking, that
1303 * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1304 * no one produces such codes and almost no one accepts them.
1305 *
1306 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1307 * supporting them.
1308 */
1309 static int vc_t416_color(struct vc_data *vc, int i,
1310 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1311 {
1312 struct rgb c;
1313
1314 i++;
1315 if (i > vc->vc_npar)
1316 return i;
1317
1318 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1319 /* 256 colours */
1320 i++;
1321 rgb_from_256(vc->vc_par[i], &c);
1322 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1323 /* 24 bit */
1324 c.r = vc->vc_par[i + 1];
1325 c.g = vc->vc_par[i + 2];
1326 c.b = vc->vc_par[i + 3];
1327 i += 3;
1328 } else
1329 return i;
1330
1331 set_color(vc, &c);
1332
1333 return i;
1334 }
1335
1336 /* console_lock is held */
1337 static void csi_m(struct vc_data *vc)
1338 {
1339 int i;
1340
1341 for (i = 0; i <= vc->vc_npar; i++)
1342 switch (vc->vc_par[i]) {
1343 case 0: /* all attributes off */
1344 default_attr(vc);
1345 break;
1346 case 1:
1347 vc->vc_intensity = 2;
1348 break;
1349 case 2:
1350 vc->vc_intensity = 0;
1351 break;
1352 case 3:
1353 vc->vc_italic = 1;
1354 break;
1355 case 21:
1356 /*
1357 * No console drivers support double underline, so
1358 * convert it to a single underline.
1359 */
1360 case 4:
1361 vc->vc_underline = 1;
1362 break;
1363 case 5:
1364 vc->vc_blink = 1;
1365 break;
1366 case 7:
1367 vc->vc_reverse = 1;
1368 break;
1369 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1370 * Select primary font, don't display control chars if
1371 * defined, don't set bit 8 on output.
1372 */
1373 vc->vc_translate = set_translate(vc->vc_charset == 0
1374 ? vc->vc_G0_charset
1375 : vc->vc_G1_charset, vc);
1376 vc->vc_disp_ctrl = 0;
1377 vc->vc_toggle_meta = 0;
1378 break;
1379 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1380 * Select first alternate font, lets chars < 32 be
1381 * displayed as ROM chars.
1382 */
1383 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1384 vc->vc_disp_ctrl = 1;
1385 vc->vc_toggle_meta = 0;
1386 break;
1387 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1388 * Select second alternate font, toggle high bit
1389 * before displaying as ROM char.
1390 */
1391 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1392 vc->vc_disp_ctrl = 1;
1393 vc->vc_toggle_meta = 1;
1394 break;
1395 case 22:
1396 vc->vc_intensity = 1;
1397 break;
1398 case 23:
1399 vc->vc_italic = 0;
1400 break;
1401 case 24:
1402 vc->vc_underline = 0;
1403 break;
1404 case 25:
1405 vc->vc_blink = 0;
1406 break;
1407 case 27:
1408 vc->vc_reverse = 0;
1409 break;
1410 case 38:
1411 i = vc_t416_color(vc, i, rgb_foreground);
1412 break;
1413 case 48:
1414 i = vc_t416_color(vc, i, rgb_background);
1415 break;
1416 case 39:
1417 vc->vc_color = (vc->vc_def_color & 0x0f) |
1418 (vc->vc_color & 0xf0);
1419 break;
1420 case 49:
1421 vc->vc_color = (vc->vc_def_color & 0xf0) |
1422 (vc->vc_color & 0x0f);
1423 break;
1424 default:
1425 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1426 if (vc->vc_par[i] < 100)
1427 vc->vc_intensity = 2;
1428 vc->vc_par[i] -= 60;
1429 }
1430 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1431 vc->vc_color = color_table[vc->vc_par[i] - 30]
1432 | (vc->vc_color & 0xf0);
1433 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1434 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1435 | (vc->vc_color & 0x0f);
1436 break;
1437 }
1438 update_attr(vc);
1439 }
1440
1441 static void respond_string(const char *p, struct tty_port *port)
1442 {
1443 while (*p) {
1444 tty_insert_flip_char(port, *p, 0);
1445 p++;
1446 }
1447 tty_schedule_flip(port);
1448 }
1449
1450 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1451 {
1452 char buf[40];
1453
1454 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1455 respond_string(buf, tty->port);
1456 }
1457
1458 static inline void status_report(struct tty_struct *tty)
1459 {
1460 respond_string("\033[0n", tty->port); /* Terminal ok */
1461 }
1462
1463 static inline void respond_ID(struct tty_struct *tty)
1464 {
1465 respond_string(VT102ID, tty->port);
1466 }
1467
1468 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1469 {
1470 char buf[8];
1471
1472 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1473 (char)('!' + mry));
1474 respond_string(buf, tty->port);
1475 }
1476
1477 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1478 int mouse_reporting(void)
1479 {
1480 return vc_cons[fg_console].d->vc_report_mouse;
1481 }
1482
1483 /* console_lock is held */
1484 static void set_mode(struct vc_data *vc, int on_off)
1485 {
1486 int i;
1487
1488 for (i = 0; i <= vc->vc_npar; i++)
1489 if (vc->vc_ques) {
1490 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1491 case 1: /* Cursor keys send ^[Ox/^[[x */
1492 if (on_off)
1493 set_kbd(vc, decckm);
1494 else
1495 clr_kbd(vc, decckm);
1496 break;
1497 case 3: /* 80/132 mode switch unimplemented */
1498 #if 0
1499 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1500 /* this alone does not suffice; some user mode
1501 utility has to change the hardware regs */
1502 #endif
1503 break;
1504 case 5: /* Inverted screen on/off */
1505 if (vc->vc_decscnm != on_off) {
1506 vc->vc_decscnm = on_off;
1507 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1508 update_attr(vc);
1509 }
1510 break;
1511 case 6: /* Origin relative/absolute */
1512 vc->vc_decom = on_off;
1513 gotoxay(vc, 0, 0);
1514 break;
1515 case 7: /* Autowrap on/off */
1516 vc->vc_decawm = on_off;
1517 break;
1518 case 8: /* Autorepeat on/off */
1519 if (on_off)
1520 set_kbd(vc, decarm);
1521 else
1522 clr_kbd(vc, decarm);
1523 break;
1524 case 9:
1525 vc->vc_report_mouse = on_off ? 1 : 0;
1526 break;
1527 case 25: /* Cursor on/off */
1528 vc->vc_deccm = on_off;
1529 break;
1530 case 1000:
1531 vc->vc_report_mouse = on_off ? 2 : 0;
1532 break;
1533 }
1534 } else {
1535 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1536 case 3: /* Monitor (display ctrls) */
1537 vc->vc_disp_ctrl = on_off;
1538 break;
1539 case 4: /* Insert Mode on/off */
1540 vc->vc_decim = on_off;
1541 break;
1542 case 20: /* Lf, Enter == CrLf/Lf */
1543 if (on_off)
1544 set_kbd(vc, lnm);
1545 else
1546 clr_kbd(vc, lnm);
1547 break;
1548 }
1549 }
1550 }
1551
1552 /* console_lock is held */
1553 static void setterm_command(struct vc_data *vc)
1554 {
1555 switch(vc->vc_par[0]) {
1556 case 1: /* set color for underline mode */
1557 if (vc->vc_can_do_color &&
1558 vc->vc_par[1] < 16) {
1559 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1560 if (vc->vc_underline)
1561 update_attr(vc);
1562 }
1563 break;
1564 case 2: /* set color for half intensity mode */
1565 if (vc->vc_can_do_color &&
1566 vc->vc_par[1] < 16) {
1567 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1568 if (vc->vc_intensity == 0)
1569 update_attr(vc);
1570 }
1571 break;
1572 case 8: /* store colors as defaults */
1573 vc->vc_def_color = vc->vc_attr;
1574 if (vc->vc_hi_font_mask == 0x100)
1575 vc->vc_def_color >>= 1;
1576 default_attr(vc);
1577 update_attr(vc);
1578 break;
1579 case 9: /* set blanking interval */
1580 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1581 poke_blanked_console();
1582 break;
1583 case 10: /* set bell frequency in Hz */
1584 if (vc->vc_npar >= 1)
1585 vc->vc_bell_pitch = vc->vc_par[1];
1586 else
1587 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1588 break;
1589 case 11: /* set bell duration in msec */
1590 if (vc->vc_npar >= 1)
1591 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1592 msecs_to_jiffies(vc->vc_par[1]) : 0;
1593 else
1594 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1595 break;
1596 case 12: /* bring specified console to the front */
1597 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1598 set_console(vc->vc_par[1] - 1);
1599 break;
1600 case 13: /* unblank the screen */
1601 poke_blanked_console();
1602 break;
1603 case 14: /* set vesa powerdown interval */
1604 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1605 break;
1606 case 15: /* activate the previous console */
1607 set_console(last_console);
1608 break;
1609 case 16: /* set cursor blink duration in msec */
1610 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1611 vc->vc_par[1] <= USHRT_MAX)
1612 vc->vc_cur_blink_ms = vc->vc_par[1];
1613 else
1614 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1615 break;
1616 }
1617 }
1618
1619 /* console_lock is held */
1620 static void csi_at(struct vc_data *vc, unsigned int nr)
1621 {
1622 if (nr > vc->vc_cols - vc->vc_x)
1623 nr = vc->vc_cols - vc->vc_x;
1624 else if (!nr)
1625 nr = 1;
1626 insert_char(vc, nr);
1627 }
1628
1629 /* console_lock is held */
1630 static void csi_L(struct vc_data *vc, unsigned int nr)
1631 {
1632 if (nr > vc->vc_rows - vc->vc_y)
1633 nr = vc->vc_rows - vc->vc_y;
1634 else if (!nr)
1635 nr = 1;
1636 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1637 vc->vc_need_wrap = 0;
1638 }
1639
1640 /* console_lock is held */
1641 static void csi_P(struct vc_data *vc, unsigned int nr)
1642 {
1643 if (nr > vc->vc_cols - vc->vc_x)
1644 nr = vc->vc_cols - vc->vc_x;
1645 else if (!nr)
1646 nr = 1;
1647 delete_char(vc, nr);
1648 }
1649
1650 /* console_lock is held */
1651 static void csi_M(struct vc_data *vc, unsigned int nr)
1652 {
1653 if (nr > vc->vc_rows - vc->vc_y)
1654 nr = vc->vc_rows - vc->vc_y;
1655 else if (!nr)
1656 nr=1;
1657 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1658 vc->vc_need_wrap = 0;
1659 }
1660
1661 /* console_lock is held (except via vc_init->reset_terminal */
1662 static void save_cur(struct vc_data *vc)
1663 {
1664 vc->vc_saved_x = vc->vc_x;
1665 vc->vc_saved_y = vc->vc_y;
1666 vc->vc_s_intensity = vc->vc_intensity;
1667 vc->vc_s_italic = vc->vc_italic;
1668 vc->vc_s_underline = vc->vc_underline;
1669 vc->vc_s_blink = vc->vc_blink;
1670 vc->vc_s_reverse = vc->vc_reverse;
1671 vc->vc_s_charset = vc->vc_charset;
1672 vc->vc_s_color = vc->vc_color;
1673 vc->vc_saved_G0 = vc->vc_G0_charset;
1674 vc->vc_saved_G1 = vc->vc_G1_charset;
1675 }
1676
1677 /* console_lock is held */
1678 static void restore_cur(struct vc_data *vc)
1679 {
1680 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1681 vc->vc_intensity = vc->vc_s_intensity;
1682 vc->vc_italic = vc->vc_s_italic;
1683 vc->vc_underline = vc->vc_s_underline;
1684 vc->vc_blink = vc->vc_s_blink;
1685 vc->vc_reverse = vc->vc_s_reverse;
1686 vc->vc_charset = vc->vc_s_charset;
1687 vc->vc_color = vc->vc_s_color;
1688 vc->vc_G0_charset = vc->vc_saved_G0;
1689 vc->vc_G1_charset = vc->vc_saved_G1;
1690 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1691 update_attr(vc);
1692 vc->vc_need_wrap = 0;
1693 }
1694
1695 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1696 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1697 ESpalette, ESosc };
1698
1699 /* console_lock is held (except via vc_init()) */
1700 static void reset_terminal(struct vc_data *vc, int do_clear)
1701 {
1702 vc->vc_top = 0;
1703 vc->vc_bottom = vc->vc_rows;
1704 vc->vc_state = ESnormal;
1705 vc->vc_ques = 0;
1706 vc->vc_translate = set_translate(LAT1_MAP, vc);
1707 vc->vc_G0_charset = LAT1_MAP;
1708 vc->vc_G1_charset = GRAF_MAP;
1709 vc->vc_charset = 0;
1710 vc->vc_need_wrap = 0;
1711 vc->vc_report_mouse = 0;
1712 vc->vc_utf = default_utf8;
1713 vc->vc_utf_count = 0;
1714
1715 vc->vc_disp_ctrl = 0;
1716 vc->vc_toggle_meta = 0;
1717
1718 vc->vc_decscnm = 0;
1719 vc->vc_decom = 0;
1720 vc->vc_decawm = 1;
1721 vc->vc_deccm = global_cursor_default;
1722 vc->vc_decim = 0;
1723
1724 vt_reset_keyboard(vc->vc_num);
1725
1726 vc->vc_cursor_type = cur_default;
1727 vc->vc_complement_mask = vc->vc_s_complement_mask;
1728
1729 default_attr(vc);
1730 update_attr(vc);
1731
1732 vc->vc_tab_stop[0] =
1733 vc->vc_tab_stop[1] =
1734 vc->vc_tab_stop[2] =
1735 vc->vc_tab_stop[3] =
1736 vc->vc_tab_stop[4] =
1737 vc->vc_tab_stop[5] =
1738 vc->vc_tab_stop[6] =
1739 vc->vc_tab_stop[7] = 0x01010101;
1740
1741 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1742 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1743 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1744
1745 gotoxy(vc, 0, 0);
1746 save_cur(vc);
1747 if (do_clear)
1748 csi_J(vc, 2);
1749 }
1750
1751 /* console_lock is held */
1752 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1753 {
1754 /*
1755 * Control characters can be used in the _middle_
1756 * of an escape sequence.
1757 */
1758 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1759 return;
1760 switch (c) {
1761 case 0:
1762 return;
1763 case 7:
1764 if (vc->vc_state == ESosc)
1765 vc->vc_state = ESnormal;
1766 else if (vc->vc_bell_duration)
1767 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1768 return;
1769 case 8:
1770 bs(vc);
1771 return;
1772 case 9:
1773 vc->vc_pos -= (vc->vc_x << 1);
1774 while (vc->vc_x < vc->vc_cols - 1) {
1775 vc->vc_x++;
1776 if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
1777 break;
1778 }
1779 vc->vc_pos += (vc->vc_x << 1);
1780 notify_write(vc, '\t');
1781 return;
1782 case 10: case 11: case 12:
1783 lf(vc);
1784 if (!is_kbd(vc, lnm))
1785 return;
1786 case 13:
1787 cr(vc);
1788 return;
1789 case 14:
1790 vc->vc_charset = 1;
1791 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1792 vc->vc_disp_ctrl = 1;
1793 return;
1794 case 15:
1795 vc->vc_charset = 0;
1796 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1797 vc->vc_disp_ctrl = 0;
1798 return;
1799 case 24: case 26:
1800 vc->vc_state = ESnormal;
1801 return;
1802 case 27:
1803 vc->vc_state = ESesc;
1804 return;
1805 case 127:
1806 del(vc);
1807 return;
1808 case 128+27:
1809 vc->vc_state = ESsquare;
1810 return;
1811 }
1812 switch(vc->vc_state) {
1813 case ESesc:
1814 vc->vc_state = ESnormal;
1815 switch (c) {
1816 case '[':
1817 vc->vc_state = ESsquare;
1818 return;
1819 case ']':
1820 vc->vc_state = ESnonstd;
1821 return;
1822 case '%':
1823 vc->vc_state = ESpercent;
1824 return;
1825 case 'E':
1826 cr(vc);
1827 lf(vc);
1828 return;
1829 case 'M':
1830 ri(vc);
1831 return;
1832 case 'D':
1833 lf(vc);
1834 return;
1835 case 'H':
1836 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
1837 return;
1838 case 'Z':
1839 respond_ID(tty);
1840 return;
1841 case '7':
1842 save_cur(vc);
1843 return;
1844 case '8':
1845 restore_cur(vc);
1846 return;
1847 case '(':
1848 vc->vc_state = ESsetG0;
1849 return;
1850 case ')':
1851 vc->vc_state = ESsetG1;
1852 return;
1853 case '#':
1854 vc->vc_state = EShash;
1855 return;
1856 case 'c':
1857 reset_terminal(vc, 1);
1858 return;
1859 case '>': /* Numeric keypad */
1860 clr_kbd(vc, kbdapplic);
1861 return;
1862 case '=': /* Appl. keypad */
1863 set_kbd(vc, kbdapplic);
1864 return;
1865 }
1866 return;
1867 case ESnonstd:
1868 if (c=='P') { /* palette escape sequence */
1869 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1870 vc->vc_par[vc->vc_npar] = 0;
1871 vc->vc_npar = 0;
1872 vc->vc_state = ESpalette;
1873 return;
1874 } else if (c=='R') { /* reset palette */
1875 reset_palette(vc);
1876 vc->vc_state = ESnormal;
1877 } else if (c>='0' && c<='9')
1878 vc->vc_state = ESosc;
1879 else
1880 vc->vc_state = ESnormal;
1881 return;
1882 case ESpalette:
1883 if (isxdigit(c)) {
1884 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1885 if (vc->vc_npar == 7) {
1886 int i = vc->vc_par[0] * 3, j = 1;
1887 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1888 vc->vc_palette[i++] += vc->vc_par[j++];
1889 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1890 vc->vc_palette[i++] += vc->vc_par[j++];
1891 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1892 vc->vc_palette[i] += vc->vc_par[j];
1893 set_palette(vc);
1894 vc->vc_state = ESnormal;
1895 }
1896 } else
1897 vc->vc_state = ESnormal;
1898 return;
1899 case ESsquare:
1900 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1901 vc->vc_par[vc->vc_npar] = 0;
1902 vc->vc_npar = 0;
1903 vc->vc_state = ESgetpars;
1904 if (c == '[') { /* Function key */
1905 vc->vc_state=ESfunckey;
1906 return;
1907 }
1908 vc->vc_ques = (c == '?');
1909 if (vc->vc_ques)
1910 return;
1911 case ESgetpars:
1912 if (c == ';' && vc->vc_npar < NPAR - 1) {
1913 vc->vc_npar++;
1914 return;
1915 } else if (c>='0' && c<='9') {
1916 vc->vc_par[vc->vc_npar] *= 10;
1917 vc->vc_par[vc->vc_npar] += c - '0';
1918 return;
1919 }
1920 vc->vc_state = ESnormal;
1921 switch(c) {
1922 case 'h':
1923 set_mode(vc, 1);
1924 return;
1925 case 'l':
1926 set_mode(vc, 0);
1927 return;
1928 case 'c':
1929 if (vc->vc_ques) {
1930 if (vc->vc_par[0])
1931 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1932 else
1933 vc->vc_cursor_type = cur_default;
1934 return;
1935 }
1936 break;
1937 case 'm':
1938 if (vc->vc_ques) {
1939 clear_selection();
1940 if (vc->vc_par[0])
1941 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1942 else
1943 vc->vc_complement_mask = vc->vc_s_complement_mask;
1944 return;
1945 }
1946 break;
1947 case 'n':
1948 if (!vc->vc_ques) {
1949 if (vc->vc_par[0] == 5)
1950 status_report(tty);
1951 else if (vc->vc_par[0] == 6)
1952 cursor_report(vc, tty);
1953 }
1954 return;
1955 }
1956 if (vc->vc_ques) {
1957 vc->vc_ques = 0;
1958 return;
1959 }
1960 switch(c) {
1961 case 'G': case '`':
1962 if (vc->vc_par[0])
1963 vc->vc_par[0]--;
1964 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1965 return;
1966 case 'A':
1967 if (!vc->vc_par[0])
1968 vc->vc_par[0]++;
1969 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1970 return;
1971 case 'B': case 'e':
1972 if (!vc->vc_par[0])
1973 vc->vc_par[0]++;
1974 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1975 return;
1976 case 'C': case 'a':
1977 if (!vc->vc_par[0])
1978 vc->vc_par[0]++;
1979 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1980 return;
1981 case 'D':
1982 if (!vc->vc_par[0])
1983 vc->vc_par[0]++;
1984 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1985 return;
1986 case 'E':
1987 if (!vc->vc_par[0])
1988 vc->vc_par[0]++;
1989 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1990 return;
1991 case 'F':
1992 if (!vc->vc_par[0])
1993 vc->vc_par[0]++;
1994 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1995 return;
1996 case 'd':
1997 if (vc->vc_par[0])
1998 vc->vc_par[0]--;
1999 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2000 return;
2001 case 'H': case 'f':
2002 if (vc->vc_par[0])
2003 vc->vc_par[0]--;
2004 if (vc->vc_par[1])
2005 vc->vc_par[1]--;
2006 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2007 return;
2008 case 'J':
2009 csi_J(vc, vc->vc_par[0]);
2010 return;
2011 case 'K':
2012 csi_K(vc, vc->vc_par[0]);
2013 return;
2014 case 'L':
2015 csi_L(vc, vc->vc_par[0]);
2016 return;
2017 case 'M':
2018 csi_M(vc, vc->vc_par[0]);
2019 return;
2020 case 'P':
2021 csi_P(vc, vc->vc_par[0]);
2022 return;
2023 case 'c':
2024 if (!vc->vc_par[0])
2025 respond_ID(tty);
2026 return;
2027 case 'g':
2028 if (!vc->vc_par[0])
2029 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2030 else if (vc->vc_par[0] == 3) {
2031 vc->vc_tab_stop[0] =
2032 vc->vc_tab_stop[1] =
2033 vc->vc_tab_stop[2] =
2034 vc->vc_tab_stop[3] =
2035 vc->vc_tab_stop[4] =
2036 vc->vc_tab_stop[5] =
2037 vc->vc_tab_stop[6] =
2038 vc->vc_tab_stop[7] = 0;
2039 }
2040 return;
2041 case 'm':
2042 csi_m(vc);
2043 return;
2044 case 'q': /* DECLL - but only 3 leds */
2045 /* map 0,1,2,3 to 0,1,2,4 */
2046 if (vc->vc_par[0] < 4)
2047 vt_set_led_state(vc->vc_num,
2048 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2049 return;
2050 case 'r':
2051 if (!vc->vc_par[0])
2052 vc->vc_par[0]++;
2053 if (!vc->vc_par[1])
2054 vc->vc_par[1] = vc->vc_rows;
2055 /* Minimum allowed region is 2 lines */
2056 if (vc->vc_par[0] < vc->vc_par[1] &&
2057 vc->vc_par[1] <= vc->vc_rows) {
2058 vc->vc_top = vc->vc_par[0] - 1;
2059 vc->vc_bottom = vc->vc_par[1];
2060 gotoxay(vc, 0, 0);
2061 }
2062 return;
2063 case 's':
2064 save_cur(vc);
2065 return;
2066 case 'u':
2067 restore_cur(vc);
2068 return;
2069 case 'X':
2070 csi_X(vc, vc->vc_par[0]);
2071 return;
2072 case '@':
2073 csi_at(vc, vc->vc_par[0]);
2074 return;
2075 case ']': /* setterm functions */
2076 setterm_command(vc);
2077 return;
2078 }
2079 return;
2080 case ESpercent:
2081 vc->vc_state = ESnormal;
2082 switch (c) {
2083 case '@': /* defined in ISO 2022 */
2084 vc->vc_utf = 0;
2085 return;
2086 case 'G': /* prelim official escape code */
2087 case '8': /* retained for compatibility */
2088 vc->vc_utf = 1;
2089 return;
2090 }
2091 return;
2092 case ESfunckey:
2093 vc->vc_state = ESnormal;
2094 return;
2095 case EShash:
2096 vc->vc_state = ESnormal;
2097 if (c == '8') {
2098 /* DEC screen alignment test. kludge :-) */
2099 vc->vc_video_erase_char =
2100 (vc->vc_video_erase_char & 0xff00) | 'E';
2101 csi_J(vc, 2);
2102 vc->vc_video_erase_char =
2103 (vc->vc_video_erase_char & 0xff00) | ' ';
2104 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2105 }
2106 return;
2107 case ESsetG0:
2108 if (c == '0')
2109 vc->vc_G0_charset = GRAF_MAP;
2110 else if (c == 'B')
2111 vc->vc_G0_charset = LAT1_MAP;
2112 else if (c == 'U')
2113 vc->vc_G0_charset = IBMPC_MAP;
2114 else if (c == 'K')
2115 vc->vc_G0_charset = USER_MAP;
2116 if (vc->vc_charset == 0)
2117 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2118 vc->vc_state = ESnormal;
2119 return;
2120 case ESsetG1:
2121 if (c == '0')
2122 vc->vc_G1_charset = GRAF_MAP;
2123 else if (c == 'B')
2124 vc->vc_G1_charset = LAT1_MAP;
2125 else if (c == 'U')
2126 vc->vc_G1_charset = IBMPC_MAP;
2127 else if (c == 'K')
2128 vc->vc_G1_charset = USER_MAP;
2129 if (vc->vc_charset == 1)
2130 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2131 vc->vc_state = ESnormal;
2132 return;
2133 case ESosc:
2134 return;
2135 default:
2136 vc->vc_state = ESnormal;
2137 }
2138 }
2139
2140 /* is_double_width() is based on the wcwidth() implementation by
2141 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2142 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2143 */
2144 struct interval {
2145 uint32_t first;
2146 uint32_t last;
2147 };
2148
2149 static int ucs_cmp(const void *key, const void *elt)
2150 {
2151 uint32_t ucs = *(uint32_t *)key;
2152 struct interval e = *(struct interval *) elt;
2153
2154 if (ucs > e.last)
2155 return 1;
2156 else if (ucs < e.first)
2157 return -1;
2158 return 0;
2159 }
2160
2161 static int is_double_width(uint32_t ucs)
2162 {
2163 static const struct interval double_width[] = {
2164 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2165 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2166 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2167 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2168 };
2169 if (ucs < double_width[0].first ||
2170 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2171 return 0;
2172
2173 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2174 sizeof(struct interval), ucs_cmp) != NULL;
2175 }
2176
2177 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2178 unsigned long draw_to, int *draw_x)
2179 {
2180 if (*draw_x < 0)
2181 return;
2182
2183 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2184 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2185 *draw_x = -1;
2186 }
2187
2188 /* acquires console_lock */
2189 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2190 {
2191 int c, tc, ok, n = 0, draw_x = -1;
2192 unsigned int currcons;
2193 unsigned long draw_from = 0, draw_to = 0;
2194 struct vc_data *vc;
2195 unsigned char vc_attr;
2196 struct vt_notifier_param param;
2197 uint8_t rescan;
2198 uint8_t inverse;
2199 uint8_t width;
2200 u16 himask, charmask;
2201
2202 if (in_interrupt())
2203 return count;
2204
2205 might_sleep();
2206
2207 console_lock();
2208 vc = tty->driver_data;
2209 if (vc == NULL) {
2210 pr_err("vt: argh, driver_data is NULL !\n");
2211 console_unlock();
2212 return 0;
2213 }
2214
2215 currcons = vc->vc_num;
2216 if (!vc_cons_allocated(currcons)) {
2217 /* could this happen? */
2218 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2219 console_unlock();
2220 return 0;
2221 }
2222
2223 himask = vc->vc_hi_font_mask;
2224 charmask = himask ? 0x1ff : 0xff;
2225
2226 /* undraw cursor first */
2227 if (con_is_fg(vc))
2228 hide_cursor(vc);
2229
2230 param.vc = vc;
2231
2232 while (!tty->stopped && count) {
2233 int orig = *buf;
2234 c = orig;
2235 buf++;
2236 n++;
2237 count--;
2238 rescan = 0;
2239 inverse = 0;
2240 width = 1;
2241
2242 /* Do no translation at all in control states */
2243 if (vc->vc_state != ESnormal) {
2244 tc = c;
2245 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2246 /* Combine UTF-8 into Unicode in vc_utf_char.
2247 * vc_utf_count is the number of continuation bytes still
2248 * expected to arrive.
2249 * vc_npar is the number of continuation bytes arrived so
2250 * far
2251 */
2252 rescan_last_byte:
2253 if ((c & 0xc0) == 0x80) {
2254 /* Continuation byte received */
2255 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2256 if (vc->vc_utf_count) {
2257 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2258 vc->vc_npar++;
2259 if (--vc->vc_utf_count) {
2260 /* Still need some bytes */
2261 continue;
2262 }
2263 /* Got a whole character */
2264 c = vc->vc_utf_char;
2265 /* Reject overlong sequences */
2266 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2267 c > utf8_length_changes[vc->vc_npar])
2268 c = 0xfffd;
2269 } else {
2270 /* Unexpected continuation byte */
2271 vc->vc_utf_count = 0;
2272 c = 0xfffd;
2273 }
2274 } else {
2275 /* Single ASCII byte or first byte of a sequence received */
2276 if (vc->vc_utf_count) {
2277 /* Continuation byte expected */
2278 rescan = 1;
2279 vc->vc_utf_count = 0;
2280 c = 0xfffd;
2281 } else if (c > 0x7f) {
2282 /* First byte of a multibyte sequence received */
2283 vc->vc_npar = 0;
2284 if ((c & 0xe0) == 0xc0) {
2285 vc->vc_utf_count = 1;
2286 vc->vc_utf_char = (c & 0x1f);
2287 } else if ((c & 0xf0) == 0xe0) {
2288 vc->vc_utf_count = 2;
2289 vc->vc_utf_char = (c & 0x0f);
2290 } else if ((c & 0xf8) == 0xf0) {
2291 vc->vc_utf_count = 3;
2292 vc->vc_utf_char = (c & 0x07);
2293 } else if ((c & 0xfc) == 0xf8) {
2294 vc->vc_utf_count = 4;
2295 vc->vc_utf_char = (c & 0x03);
2296 } else if ((c & 0xfe) == 0xfc) {
2297 vc->vc_utf_count = 5;
2298 vc->vc_utf_char = (c & 0x01);
2299 } else {
2300 /* 254 and 255 are invalid */
2301 c = 0xfffd;
2302 }
2303 if (vc->vc_utf_count) {
2304 /* Still need some bytes */
2305 continue;
2306 }
2307 }
2308 /* Nothing to do if an ASCII byte was received */
2309 }
2310 /* End of UTF-8 decoding. */
2311 /* c is the received character, or U+FFFD for invalid sequences. */
2312 /* Replace invalid Unicode code points with U+FFFD too */
2313 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2314 c = 0xfffd;
2315 tc = c;
2316 } else { /* no utf or alternate charset mode */
2317 tc = vc_translate(vc, c);
2318 }
2319
2320 param.c = tc;
2321 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2322 &param) == NOTIFY_STOP)
2323 continue;
2324
2325 /* If the original code was a control character we
2326 * only allow a glyph to be displayed if the code is
2327 * not normally used (such as for cursor movement) or
2328 * if the disp_ctrl mode has been explicitly enabled.
2329 * Certain characters (as given by the CTRL_ALWAYS
2330 * bitmap) are always displayed as control characters,
2331 * as the console would be pretty useless without
2332 * them; to display an arbitrary font position use the
2333 * direct-to-font zone in UTF-8 mode.
2334 */
2335 ok = tc && (c >= 32 ||
2336 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2337 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2338 && (c != 127 || vc->vc_disp_ctrl)
2339 && (c != 128+27);
2340
2341 if (vc->vc_state == ESnormal && ok) {
2342 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2343 if (is_double_width(c))
2344 width = 2;
2345 }
2346 /* Now try to find out how to display it */
2347 tc = conv_uni_to_pc(vc, tc);
2348 if (tc & ~charmask) {
2349 if (tc == -1 || tc == -2) {
2350 continue; /* nothing to display */
2351 }
2352 /* Glyph not found */
2353 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2354 /* In legacy mode use the glyph we get by a 1:1 mapping.
2355 This would make absolutely no sense with Unicode in mind,
2356 but do this for ASCII characters since a font may lack
2357 Unicode mapping info and we don't want to end up with
2358 having question marks only. */
2359 tc = c;
2360 } else {
2361 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2362 tc = conv_uni_to_pc(vc, 0xfffd);
2363 if (tc < 0) {
2364 inverse = 1;
2365 tc = conv_uni_to_pc(vc, '?');
2366 if (tc < 0) tc = '?';
2367 }
2368 }
2369 }
2370
2371 if (!inverse) {
2372 vc_attr = vc->vc_attr;
2373 } else {
2374 /* invert vc_attr */
2375 if (!vc->vc_can_do_color) {
2376 vc_attr = (vc->vc_attr) ^ 0x08;
2377 } else if (vc->vc_hi_font_mask == 0x100) {
2378 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2379 } else {
2380 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2381 }
2382 con_flush(vc, draw_from, draw_to, &draw_x);
2383 }
2384
2385 while (1) {
2386 if (vc->vc_need_wrap || vc->vc_decim)
2387 con_flush(vc, draw_from, draw_to,
2388 &draw_x);
2389 if (vc->vc_need_wrap) {
2390 cr(vc);
2391 lf(vc);
2392 }
2393 if (vc->vc_decim)
2394 insert_char(vc, 1);
2395 scr_writew(himask ?
2396 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2397 (vc_attr << 8) + tc,
2398 (u16 *) vc->vc_pos);
2399 if (con_should_update(vc) && draw_x < 0) {
2400 draw_x = vc->vc_x;
2401 draw_from = vc->vc_pos;
2402 }
2403 if (vc->vc_x == vc->vc_cols - 1) {
2404 vc->vc_need_wrap = vc->vc_decawm;
2405 draw_to = vc->vc_pos + 2;
2406 } else {
2407 vc->vc_x++;
2408 draw_to = (vc->vc_pos += 2);
2409 }
2410
2411 if (!--width) break;
2412
2413 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2414 if (tc < 0) tc = ' ';
2415 }
2416 notify_write(vc, c);
2417
2418 if (inverse)
2419 con_flush(vc, draw_from, draw_to, &draw_x);
2420
2421 if (rescan) {
2422 rescan = 0;
2423 inverse = 0;
2424 width = 1;
2425 c = orig;
2426 goto rescan_last_byte;
2427 }
2428 continue;
2429 }
2430 con_flush(vc, draw_from, draw_to, &draw_x);
2431 do_con_trol(tty, vc, orig);
2432 }
2433 con_flush(vc, draw_from, draw_to, &draw_x);
2434 console_conditional_schedule();
2435 console_unlock();
2436 notify_update(vc);
2437 return n;
2438 }
2439
2440 /*
2441 * This is the console switching callback.
2442 *
2443 * Doing console switching in a process context allows
2444 * us to do the switches asynchronously (needed when we want
2445 * to switch due to a keyboard interrupt). Synchronization
2446 * with other console code and prevention of re-entrancy is
2447 * ensured with console_lock.
2448 */
2449 static void console_callback(struct work_struct *ignored)
2450 {
2451 console_lock();
2452
2453 if (want_console >= 0) {
2454 if (want_console != fg_console &&
2455 vc_cons_allocated(want_console)) {
2456 hide_cursor(vc_cons[fg_console].d);
2457 change_console(vc_cons[want_console].d);
2458 /* we only changed when the console had already
2459 been allocated - a new console is not created
2460 in an interrupt routine */
2461 }
2462 want_console = -1;
2463 }
2464 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2465 do_poke_blanked_console = 0;
2466 poke_blanked_console();
2467 }
2468 if (scrollback_delta) {
2469 struct vc_data *vc = vc_cons[fg_console].d;
2470 clear_selection();
2471 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2472 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2473 scrollback_delta = 0;
2474 }
2475 if (blank_timer_expired) {
2476 do_blank_screen(0);
2477 blank_timer_expired = 0;
2478 }
2479 notify_update(vc_cons[fg_console].d);
2480
2481 console_unlock();
2482 }
2483
2484 int set_console(int nr)
2485 {
2486 struct vc_data *vc = vc_cons[fg_console].d;
2487
2488 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2489 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2490
2491 /*
2492 * Console switch will fail in console_callback() or
2493 * change_console() so there is no point scheduling
2494 * the callback
2495 *
2496 * Existing set_console() users don't check the return
2497 * value so this shouldn't break anything
2498 */
2499 return -EINVAL;
2500 }
2501
2502 want_console = nr;
2503 schedule_console_callback();
2504
2505 return 0;
2506 }
2507
2508 struct tty_driver *console_driver;
2509
2510 #ifdef CONFIG_VT_CONSOLE
2511
2512 /**
2513 * vt_kmsg_redirect() - Sets/gets the kernel message console
2514 * @new: The new virtual terminal number or -1 if the console should stay
2515 * unchanged
2516 *
2517 * By default, the kernel messages are always printed on the current virtual
2518 * console. However, the user may modify that default with the
2519 * TIOCL_SETKMSGREDIRECT ioctl call.
2520 *
2521 * This function sets the kernel message console to be @new. It returns the old
2522 * virtual console number. The virtual terminal number 0 (both as parameter and
2523 * return value) means no redirection (i.e. always printed on the currently
2524 * active console).
2525 *
2526 * The parameter -1 means that only the current console is returned, but the
2527 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2528 * case to make the code more understandable.
2529 *
2530 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2531 * the parameter and always returns 0.
2532 */
2533 int vt_kmsg_redirect(int new)
2534 {
2535 static int kmsg_con;
2536
2537 if (new != -1)
2538 return xchg(&kmsg_con, new);
2539 else
2540 return kmsg_con;
2541 }
2542
2543 /*
2544 * Console on virtual terminal
2545 *
2546 * The console must be locked when we get here.
2547 */
2548
2549 static void vt_console_print(struct console *co, const char *b, unsigned count)
2550 {
2551 struct vc_data *vc = vc_cons[fg_console].d;
2552 unsigned char c;
2553 static DEFINE_SPINLOCK(printing_lock);
2554 const ushort *start;
2555 ushort cnt = 0;
2556 ushort myx;
2557 int kmsg_console;
2558
2559 /* console busy or not yet initialized */
2560 if (!printable)
2561 return;
2562 if (!spin_trylock(&printing_lock))
2563 return;
2564
2565 kmsg_console = vt_get_kmsg_redirect();
2566 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2567 vc = vc_cons[kmsg_console - 1].d;
2568
2569 /* read `x' only after setting currcons properly (otherwise
2570 the `x' macro will read the x of the foreground console). */
2571 myx = vc->vc_x;
2572
2573 if (!vc_cons_allocated(fg_console)) {
2574 /* impossible */
2575 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2576 goto quit;
2577 }
2578
2579 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2580 goto quit;
2581
2582 /* undraw cursor first */
2583 if (con_is_fg(vc))
2584 hide_cursor(vc);
2585
2586 start = (ushort *)vc->vc_pos;
2587
2588 /* Contrived structure to try to emulate original need_wrap behaviour
2589 * Problems caused when we have need_wrap set on '\n' character */
2590 while (count--) {
2591 c = *b++;
2592 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2593 if (cnt > 0) {
2594 if (con_is_visible(vc))
2595 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2596 vc->vc_x += cnt;
2597 if (vc->vc_need_wrap)
2598 vc->vc_x--;
2599 cnt = 0;
2600 }
2601 if (c == 8) { /* backspace */
2602 bs(vc);
2603 start = (ushort *)vc->vc_pos;
2604 myx = vc->vc_x;
2605 continue;
2606 }
2607 if (c != 13)
2608 lf(vc);
2609 cr(vc);
2610 start = (ushort *)vc->vc_pos;
2611 myx = vc->vc_x;
2612 if (c == 10 || c == 13)
2613 continue;
2614 }
2615 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2616 notify_write(vc, c);
2617 cnt++;
2618 if (myx == vc->vc_cols - 1) {
2619 vc->vc_need_wrap = 1;
2620 continue;
2621 }
2622 vc->vc_pos += 2;
2623 myx++;
2624 }
2625 if (cnt > 0) {
2626 if (con_is_visible(vc))
2627 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2628 vc->vc_x += cnt;
2629 if (vc->vc_x == vc->vc_cols) {
2630 vc->vc_x--;
2631 vc->vc_need_wrap = 1;
2632 }
2633 }
2634 set_cursor(vc);
2635 notify_update(vc);
2636
2637 quit:
2638 spin_unlock(&printing_lock);
2639 }
2640
2641 static struct tty_driver *vt_console_device(struct console *c, int *index)
2642 {
2643 *index = c->index ? c->index-1 : fg_console;
2644 return console_driver;
2645 }
2646
2647 static struct console vt_console_driver = {
2648 .name = "tty",
2649 .write = vt_console_print,
2650 .device = vt_console_device,
2651 .unblank = unblank_screen,
2652 .flags = CON_PRINTBUFFER,
2653 .index = -1,
2654 };
2655 #endif
2656
2657 /*
2658 * Handling of Linux-specific VC ioctls
2659 */
2660
2661 /*
2662 * Generally a bit racy with respect to console_lock();.
2663 *
2664 * There are some functions which don't need it.
2665 *
2666 * There are some functions which can sleep for arbitrary periods
2667 * (paste_selection) but we don't need the lock there anyway.
2668 *
2669 * set_selection has locking, and definitely needs it
2670 */
2671
2672 int tioclinux(struct tty_struct *tty, unsigned long arg)
2673 {
2674 char type, data;
2675 char __user *p = (char __user *)arg;
2676 int lines;
2677 int ret;
2678
2679 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2680 return -EPERM;
2681 if (get_user(type, p))
2682 return -EFAULT;
2683 ret = 0;
2684
2685 switch (type)
2686 {
2687 case TIOCL_SETSEL:
2688 console_lock();
2689 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2690 console_unlock();
2691 break;
2692 case TIOCL_PASTESEL:
2693 ret = paste_selection(tty);
2694 break;
2695 case TIOCL_UNBLANKSCREEN:
2696 console_lock();
2697 unblank_screen();
2698 console_unlock();
2699 break;
2700 case TIOCL_SELLOADLUT:
2701 console_lock();
2702 ret = sel_loadlut(p);
2703 console_unlock();
2704 break;
2705 case TIOCL_GETSHIFTSTATE:
2706
2707 /*
2708 * Make it possible to react to Shift+Mousebutton.
2709 * Note that 'shift_state' is an undocumented
2710 * kernel-internal variable; programs not closely
2711 * related to the kernel should not use this.
2712 */
2713 data = vt_get_shift_state();
2714 ret = put_user(data, p);
2715 break;
2716 case TIOCL_GETMOUSEREPORTING:
2717 console_lock(); /* May be overkill */
2718 data = mouse_reporting();
2719 console_unlock();
2720 ret = put_user(data, p);
2721 break;
2722 case TIOCL_SETVESABLANK:
2723 console_lock();
2724 ret = set_vesa_blanking(p);
2725 console_unlock();
2726 break;
2727 case TIOCL_GETKMSGREDIRECT:
2728 data = vt_get_kmsg_redirect();
2729 ret = put_user(data, p);
2730 break;
2731 case TIOCL_SETKMSGREDIRECT:
2732 if (!capable(CAP_SYS_ADMIN)) {
2733 ret = -EPERM;
2734 } else {
2735 if (get_user(data, p+1))
2736 ret = -EFAULT;
2737 else
2738 vt_kmsg_redirect(data);
2739 }
2740 break;
2741 case TIOCL_GETFGCONSOLE:
2742 /* No locking needed as this is a transiently
2743 correct return anyway if the caller hasn't
2744 disabled switching */
2745 ret = fg_console;
2746 break;
2747 case TIOCL_SCROLLCONSOLE:
2748 if (get_user(lines, (s32 __user *)(p+4))) {
2749 ret = -EFAULT;
2750 } else {
2751 /* Need the console lock here. Note that lots
2752 of other calls need fixing before the lock
2753 is actually useful ! */
2754 console_lock();
2755 scrollfront(vc_cons[fg_console].d, lines);
2756 console_unlock();
2757 ret = 0;
2758 }
2759 break;
2760 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2761 console_lock();
2762 ignore_poke = 1;
2763 do_blank_screen(0);
2764 console_unlock();
2765 break;
2766 case TIOCL_BLANKEDSCREEN:
2767 ret = console_blanked;
2768 break;
2769 default:
2770 ret = -EINVAL;
2771 break;
2772 }
2773 return ret;
2774 }
2775
2776 /*
2777 * /dev/ttyN handling
2778 */
2779
2780 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2781 {
2782 int retval;
2783
2784 retval = do_con_write(tty, buf, count);
2785 con_flush_chars(tty);
2786
2787 return retval;
2788 }
2789
2790 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2791 {
2792 if (in_interrupt())
2793 return 0; /* n_r3964 calls put_char() from interrupt context */
2794 return do_con_write(tty, &ch, 1);
2795 }
2796
2797 static int con_write_room(struct tty_struct *tty)
2798 {
2799 if (tty->stopped)
2800 return 0;
2801 return 32768; /* No limit, really; we're not buffering */
2802 }
2803
2804 static int con_chars_in_buffer(struct tty_struct *tty)
2805 {
2806 return 0; /* we're not buffering */
2807 }
2808
2809 /*
2810 * con_throttle and con_unthrottle are only used for
2811 * paste_selection(), which has to stuff in a large number of
2812 * characters...
2813 */
2814 static void con_throttle(struct tty_struct *tty)
2815 {
2816 }
2817
2818 static void con_unthrottle(struct tty_struct *tty)
2819 {
2820 struct vc_data *vc = tty->driver_data;
2821
2822 wake_up_interruptible(&vc->paste_wait);
2823 }
2824
2825 /*
2826 * Turn the Scroll-Lock LED on when the tty is stopped
2827 */
2828 static void con_stop(struct tty_struct *tty)
2829 {
2830 int console_num;
2831 if (!tty)
2832 return;
2833 console_num = tty->index;
2834 if (!vc_cons_allocated(console_num))
2835 return;
2836 vt_kbd_con_stop(console_num);
2837 }
2838
2839 /*
2840 * Turn the Scroll-Lock LED off when the console is started
2841 */
2842 static void con_start(struct tty_struct *tty)
2843 {
2844 int console_num;
2845 if (!tty)
2846 return;
2847 console_num = tty->index;
2848 if (!vc_cons_allocated(console_num))
2849 return;
2850 vt_kbd_con_start(console_num);
2851 }
2852
2853 static void con_flush_chars(struct tty_struct *tty)
2854 {
2855 struct vc_data *vc;
2856
2857 if (in_interrupt()) /* from flush_to_ldisc */
2858 return;
2859
2860 /* if we race with con_close(), vt may be null */
2861 console_lock();
2862 vc = tty->driver_data;
2863 if (vc)
2864 set_cursor(vc);
2865 console_unlock();
2866 }
2867
2868 /*
2869 * Allocate the console screen memory.
2870 */
2871 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2872 {
2873 unsigned int currcons = tty->index;
2874 struct vc_data *vc;
2875 int ret;
2876
2877 console_lock();
2878 ret = vc_allocate(currcons);
2879 if (ret)
2880 goto unlock;
2881
2882 vc = vc_cons[currcons].d;
2883
2884 /* Still being freed */
2885 if (vc->port.tty) {
2886 ret = -ERESTARTSYS;
2887 goto unlock;
2888 }
2889
2890 ret = tty_port_install(&vc->port, driver, tty);
2891 if (ret)
2892 goto unlock;
2893
2894 tty->driver_data = vc;
2895 vc->port.tty = tty;
2896
2897 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2898 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2899 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2900 }
2901 if (vc->vc_utf)
2902 tty->termios.c_iflag |= IUTF8;
2903 else
2904 tty->termios.c_iflag &= ~IUTF8;
2905 unlock:
2906 console_unlock();
2907 return ret;
2908 }
2909
2910 static int con_open(struct tty_struct *tty, struct file *filp)
2911 {
2912 /* everything done in install */
2913 return 0;
2914 }
2915
2916
2917 static void con_close(struct tty_struct *tty, struct file *filp)
2918 {
2919 /* Nothing to do - we defer to shutdown */
2920 }
2921
2922 static void con_shutdown(struct tty_struct *tty)
2923 {
2924 struct vc_data *vc = tty->driver_data;
2925 BUG_ON(vc == NULL);
2926 console_lock();
2927 vc->port.tty = NULL;
2928 console_unlock();
2929 }
2930
2931 static int default_color = 7; /* white */
2932 static int default_italic_color = 2; // green (ASCII)
2933 static int default_underline_color = 3; // cyan (ASCII)
2934 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2935 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2936 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2937
2938 static void vc_init(struct vc_data *vc, unsigned int rows,
2939 unsigned int cols, int do_clear)
2940 {
2941 int j, k ;
2942
2943 vc->vc_cols = cols;
2944 vc->vc_rows = rows;
2945 vc->vc_size_row = cols << 1;
2946 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2947
2948 set_origin(vc);
2949 vc->vc_pos = vc->vc_origin;
2950 reset_vc(vc);
2951 for (j=k=0; j<16; j++) {
2952 vc->vc_palette[k++] = default_red[j] ;
2953 vc->vc_palette[k++] = default_grn[j] ;
2954 vc->vc_palette[k++] = default_blu[j] ;
2955 }
2956 vc->vc_def_color = default_color;
2957 vc->vc_ulcolor = default_underline_color;
2958 vc->vc_itcolor = default_italic_color;
2959 vc->vc_halfcolor = 0x08; /* grey */
2960 init_waitqueue_head(&vc->paste_wait);
2961 reset_terminal(vc, do_clear);
2962 }
2963
2964 /*
2965 * This routine initializes console interrupts, and does nothing
2966 * else. If you want the screen to clear, call tty_write with
2967 * the appropriate escape-sequence.
2968 */
2969
2970 static int __init con_init(void)
2971 {
2972 const char *display_desc = NULL;
2973 struct vc_data *vc;
2974 unsigned int currcons = 0, i;
2975
2976 console_lock();
2977
2978 if (conswitchp)
2979 display_desc = conswitchp->con_startup();
2980 if (!display_desc) {
2981 fg_console = 0;
2982 console_unlock();
2983 return 0;
2984 }
2985
2986 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2987 struct con_driver *con_driver = &registered_con_driver[i];
2988
2989 if (con_driver->con == NULL) {
2990 con_driver->con = conswitchp;
2991 con_driver->desc = display_desc;
2992 con_driver->flag = CON_DRIVER_FLAG_INIT;
2993 con_driver->first = 0;
2994 con_driver->last = MAX_NR_CONSOLES - 1;
2995 break;
2996 }
2997 }
2998
2999 for (i = 0; i < MAX_NR_CONSOLES; i++)
3000 con_driver_map[i] = conswitchp;
3001
3002 if (blankinterval) {
3003 blank_state = blank_normal_wait;
3004 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3005 }
3006
3007 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3008 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3009 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3010 tty_port_init(&vc->port);
3011 visual_init(vc, currcons, 1);
3012 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3013 vc_init(vc, vc->vc_rows, vc->vc_cols,
3014 currcons || !vc->vc_sw->con_save_screen);
3015 }
3016 currcons = fg_console = 0;
3017 master_display_fg = vc = vc_cons[currcons].d;
3018 set_origin(vc);
3019 save_screen(vc);
3020 gotoxy(vc, vc->vc_x, vc->vc_y);
3021 csi_J(vc, 0);
3022 update_screen(vc);
3023 pr_info("Console: %s %s %dx%d\n",
3024 vc->vc_can_do_color ? "colour" : "mono",
3025 display_desc, vc->vc_cols, vc->vc_rows);
3026 printable = 1;
3027
3028 console_unlock();
3029
3030 #ifdef CONFIG_VT_CONSOLE
3031 register_console(&vt_console_driver);
3032 #endif
3033 return 0;
3034 }
3035 console_initcall(con_init);
3036
3037 static const struct tty_operations con_ops = {
3038 .install = con_install,
3039 .open = con_open,
3040 .close = con_close,
3041 .write = con_write,
3042 .write_room = con_write_room,
3043 .put_char = con_put_char,
3044 .flush_chars = con_flush_chars,
3045 .chars_in_buffer = con_chars_in_buffer,
3046 .ioctl = vt_ioctl,
3047 #ifdef CONFIG_COMPAT
3048 .compat_ioctl = vt_compat_ioctl,
3049 #endif
3050 .stop = con_stop,
3051 .start = con_start,
3052 .throttle = con_throttle,
3053 .unthrottle = con_unthrottle,
3054 .resize = vt_resize,
3055 .shutdown = con_shutdown
3056 };
3057
3058 static struct cdev vc0_cdev;
3059
3060 static ssize_t show_tty_active(struct device *dev,
3061 struct device_attribute *attr, char *buf)
3062 {
3063 return sprintf(buf, "tty%d\n", fg_console + 1);
3064 }
3065 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3066
3067 static struct attribute *vt_dev_attrs[] = {
3068 &dev_attr_active.attr,
3069 NULL
3070 };
3071
3072 ATTRIBUTE_GROUPS(vt_dev);
3073
3074 int __init vty_init(const struct file_operations *console_fops)
3075 {
3076 cdev_init(&vc0_cdev, console_fops);
3077 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3078 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3079 panic("Couldn't register /dev/tty0 driver\n");
3080 tty0dev = device_create_with_groups(tty_class, NULL,
3081 MKDEV(TTY_MAJOR, 0), NULL,
3082 vt_dev_groups, "tty0");
3083 if (IS_ERR(tty0dev))
3084 tty0dev = NULL;
3085
3086 vcs_init();
3087
3088 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3089 if (!console_driver)
3090 panic("Couldn't allocate console driver\n");
3091
3092 console_driver->name = "tty";
3093 console_driver->name_base = 1;
3094 console_driver->major = TTY_MAJOR;
3095 console_driver->minor_start = 1;
3096 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3097 console_driver->init_termios = tty_std_termios;
3098 if (default_utf8)
3099 console_driver->init_termios.c_iflag |= IUTF8;
3100 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3101 tty_set_operations(console_driver, &con_ops);
3102 if (tty_register_driver(console_driver))
3103 panic("Couldn't register console driver\n");
3104 kbd_init();
3105 console_map_init();
3106 #ifdef CONFIG_MDA_CONSOLE
3107 mda_console_init();
3108 #endif
3109 return 0;
3110 }
3111
3112 #ifndef VT_SINGLE_DRIVER
3113
3114 static struct class *vtconsole_class;
3115
3116 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3117 int deflt)
3118 {
3119 struct module *owner = csw->owner;
3120 const char *desc = NULL;
3121 struct con_driver *con_driver;
3122 int i, j = -1, k = -1, retval = -ENODEV;
3123
3124 if (!try_module_get(owner))
3125 return -ENODEV;
3126
3127 WARN_CONSOLE_UNLOCKED();
3128
3129 /* check if driver is registered */
3130 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3131 con_driver = &registered_con_driver[i];
3132
3133 if (con_driver->con == csw) {
3134 desc = con_driver->desc;
3135 retval = 0;
3136 break;
3137 }
3138 }
3139
3140 if (retval)
3141 goto err;
3142
3143 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3144 csw->con_startup();
3145 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3146 }
3147
3148 if (deflt) {
3149 if (conswitchp)
3150 module_put(conswitchp->owner);
3151
3152 __module_get(owner);
3153 conswitchp = csw;
3154 }
3155
3156 first = max(first, con_driver->first);
3157 last = min(last, con_driver->last);
3158
3159 for (i = first; i <= last; i++) {
3160 int old_was_color;
3161 struct vc_data *vc = vc_cons[i].d;
3162
3163 if (con_driver_map[i])
3164 module_put(con_driver_map[i]->owner);
3165 __module_get(owner);
3166 con_driver_map[i] = csw;
3167
3168 if (!vc || !vc->vc_sw)
3169 continue;
3170
3171 j = i;
3172
3173 if (con_is_visible(vc)) {
3174 k = i;
3175 save_screen(vc);
3176 }
3177
3178 old_was_color = vc->vc_can_do_color;
3179 vc->vc_sw->con_deinit(vc);
3180 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3181 visual_init(vc, i, 0);
3182 set_origin(vc);
3183 update_attr(vc);
3184
3185 /* If the console changed between mono <-> color, then
3186 * the attributes in the screenbuf will be wrong. The
3187 * following resets all attributes to something sane.
3188 */
3189 if (old_was_color != vc->vc_can_do_color)
3190 clear_buffer_attributes(vc);
3191 }
3192
3193 pr_info("Console: switching ");
3194 if (!deflt)
3195 pr_cont("consoles %d-%d ", first + 1, last + 1);
3196 if (j >= 0) {
3197 struct vc_data *vc = vc_cons[j].d;
3198
3199 pr_cont("to %s %s %dx%d\n",
3200 vc->vc_can_do_color ? "colour" : "mono",
3201 desc, vc->vc_cols, vc->vc_rows);
3202
3203 if (k >= 0) {
3204 vc = vc_cons[k].d;
3205 update_screen(vc);
3206 }
3207 } else {
3208 pr_cont("to %s\n", desc);
3209 }
3210
3211 retval = 0;
3212 err:
3213 module_put(owner);
3214 return retval;
3215 };
3216
3217
3218 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3219 /* unlocked version of unbind_con_driver() */
3220 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3221 {
3222 struct module *owner = csw->owner;
3223 const struct consw *defcsw = NULL;
3224 struct con_driver *con_driver = NULL, *con_back = NULL;
3225 int i, retval = -ENODEV;
3226
3227 if (!try_module_get(owner))
3228 return -ENODEV;
3229
3230 WARN_CONSOLE_UNLOCKED();
3231
3232 /* check if driver is registered and if it is unbindable */
3233 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3234 con_driver = &registered_con_driver[i];
3235
3236 if (con_driver->con == csw &&
3237 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3238 retval = 0;
3239 break;
3240 }
3241 }
3242
3243 if (retval)
3244 goto err;
3245
3246 retval = -ENODEV;
3247
3248 /* check if backup driver exists */
3249 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3250 con_back = &registered_con_driver[i];
3251
3252 if (con_back->con && con_back->con != csw) {
3253 defcsw = con_back->con;
3254 retval = 0;
3255 break;
3256 }
3257 }
3258
3259 if (retval)
3260 goto err;
3261
3262 if (!con_is_bound(csw))
3263 goto err;
3264
3265 first = max(first, con_driver->first);
3266 last = min(last, con_driver->last);
3267
3268 for (i = first; i <= last; i++) {
3269 if (con_driver_map[i] == csw) {
3270 module_put(csw->owner);
3271 con_driver_map[i] = NULL;
3272 }
3273 }
3274
3275 if (!con_is_bound(defcsw)) {
3276 const struct consw *defconsw = conswitchp;
3277
3278 defcsw->con_startup();
3279 con_back->flag |= CON_DRIVER_FLAG_INIT;
3280 /*
3281 * vgacon may change the default driver to point
3282 * to dummycon, we restore it here...
3283 */
3284 conswitchp = defconsw;
3285 }
3286
3287 if (!con_is_bound(csw))
3288 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3289
3290 /* ignore return value, binding should not fail */
3291 do_bind_con_driver(defcsw, first, last, deflt);
3292 err:
3293 module_put(owner);
3294 return retval;
3295
3296 }
3297 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3298
3299 static int vt_bind(struct con_driver *con)
3300 {
3301 const struct consw *defcsw = NULL, *csw = NULL;
3302 int i, more = 1, first = -1, last = -1, deflt = 0;
3303
3304 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3305 goto err;
3306
3307 csw = con->con;
3308
3309 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3310 struct con_driver *con = &registered_con_driver[i];
3311
3312 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3313 defcsw = con->con;
3314 break;
3315 }
3316 }
3317
3318 if (!defcsw)
3319 goto err;
3320
3321 while (more) {
3322 more = 0;
3323
3324 for (i = con->first; i <= con->last; i++) {
3325 if (con_driver_map[i] == defcsw) {
3326 if (first == -1)
3327 first = i;
3328 last = i;
3329 more = 1;
3330 } else if (first != -1)
3331 break;
3332 }
3333
3334 if (first == 0 && last == MAX_NR_CONSOLES -1)
3335 deflt = 1;
3336
3337 if (first != -1)
3338 do_bind_con_driver(csw, first, last, deflt);
3339
3340 first = -1;
3341 last = -1;
3342 deflt = 0;
3343 }
3344
3345 err:
3346 return 0;
3347 }
3348
3349 static int vt_unbind(struct con_driver *con)
3350 {
3351 const struct consw *csw = NULL;
3352 int i, more = 1, first = -1, last = -1, deflt = 0;
3353 int ret;
3354
3355 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3356 goto err;
3357
3358 csw = con->con;
3359
3360 while (more) {
3361 more = 0;
3362
3363 for (i = con->first; i <= con->last; i++) {
3364 if (con_driver_map[i] == csw) {
3365 if (first == -1)
3366 first = i;
3367 last = i;
3368 more = 1;
3369 } else if (first != -1)
3370 break;
3371 }
3372
3373 if (first == 0 && last == MAX_NR_CONSOLES -1)
3374 deflt = 1;
3375
3376 if (first != -1) {
3377 ret = do_unbind_con_driver(csw, first, last, deflt);
3378 if (ret != 0)
3379 return ret;
3380 }
3381
3382 first = -1;
3383 last = -1;
3384 deflt = 0;
3385 }
3386
3387 err:
3388 return 0;
3389 }
3390 #else
3391 static inline int vt_bind(struct con_driver *con)
3392 {
3393 return 0;
3394 }
3395 static inline int vt_unbind(struct con_driver *con)
3396 {
3397 return 0;
3398 }
3399 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3400
3401 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3402 const char *buf, size_t count)
3403 {
3404 struct con_driver *con = dev_get_drvdata(dev);
3405 int bind = simple_strtoul(buf, NULL, 0);
3406
3407 console_lock();
3408
3409 if (bind)
3410 vt_bind(con);
3411 else
3412 vt_unbind(con);
3413
3414 console_unlock();
3415
3416 return count;
3417 }
3418
3419 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3420 char *buf)
3421 {
3422 struct con_driver *con = dev_get_drvdata(dev);
3423 int bind = con_is_bound(con->con);
3424
3425 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3426 }
3427
3428 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3429 char *buf)
3430 {
3431 struct con_driver *con = dev_get_drvdata(dev);
3432
3433 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3434 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3435 con->desc);
3436
3437 }
3438
3439 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3440 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3441
3442 static struct attribute *con_dev_attrs[] = {
3443 &dev_attr_bind.attr,
3444 &dev_attr_name.attr,
3445 NULL
3446 };
3447
3448 ATTRIBUTE_GROUPS(con_dev);
3449
3450 static int vtconsole_init_device(struct con_driver *con)
3451 {
3452 con->flag |= CON_DRIVER_FLAG_ATTR;
3453 return 0;
3454 }
3455
3456 static void vtconsole_deinit_device(struct con_driver *con)
3457 {
3458 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3459 }
3460
3461 /**
3462 * con_is_bound - checks if driver is bound to the console
3463 * @csw: console driver
3464 *
3465 * RETURNS: zero if unbound, nonzero if bound
3466 *
3467 * Drivers can call this and if zero, they should release
3468 * all resources allocated on con_startup()
3469 */
3470 int con_is_bound(const struct consw *csw)
3471 {
3472 int i, bound = 0;
3473
3474 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3475 if (con_driver_map[i] == csw) {
3476 bound = 1;
3477 break;
3478 }
3479 }
3480
3481 return bound;
3482 }
3483 EXPORT_SYMBOL(con_is_bound);
3484
3485 /**
3486 * con_debug_enter - prepare the console for the kernel debugger
3487 * @sw: console driver
3488 *
3489 * Called when the console is taken over by the kernel debugger, this
3490 * function needs to save the current console state, then put the console
3491 * into a state suitable for the kernel debugger.
3492 *
3493 * RETURNS:
3494 * Zero on success, nonzero if a failure occurred when trying to prepare
3495 * the console for the debugger.
3496 */
3497 int con_debug_enter(struct vc_data *vc)
3498 {
3499 int ret = 0;
3500
3501 saved_fg_console = fg_console;
3502 saved_last_console = last_console;
3503 saved_want_console = want_console;
3504 saved_vc_mode = vc->vc_mode;
3505 saved_console_blanked = console_blanked;
3506 vc->vc_mode = KD_TEXT;
3507 console_blanked = 0;
3508 if (vc->vc_sw->con_debug_enter)
3509 ret = vc->vc_sw->con_debug_enter(vc);
3510 #ifdef CONFIG_KGDB_KDB
3511 /* Set the initial LINES variable if it is not already set */
3512 if (vc->vc_rows < 999) {
3513 int linecount;
3514 char lns[4];
3515 const char *setargs[3] = {
3516 "set",
3517 "LINES",
3518 lns,
3519 };
3520 if (kdbgetintenv(setargs[0], &linecount)) {
3521 snprintf(lns, 4, "%i", vc->vc_rows);
3522 kdb_set(2, setargs);
3523 }
3524 }
3525 if (vc->vc_cols < 999) {
3526 int colcount;
3527 char cols[4];
3528 const char *setargs[3] = {
3529 "set",
3530 "COLUMNS",
3531 cols,
3532 };
3533 if (kdbgetintenv(setargs[0], &colcount)) {
3534 snprintf(cols, 4, "%i", vc->vc_cols);
3535 kdb_set(2, setargs);
3536 }
3537 }
3538 #endif /* CONFIG_KGDB_KDB */
3539 return ret;
3540 }
3541 EXPORT_SYMBOL_GPL(con_debug_enter);
3542
3543 /**
3544 * con_debug_leave - restore console state
3545 * @sw: console driver
3546 *
3547 * Restore the console state to what it was before the kernel debugger
3548 * was invoked.
3549 *
3550 * RETURNS:
3551 * Zero on success, nonzero if a failure occurred when trying to restore
3552 * the console.
3553 */
3554 int con_debug_leave(void)
3555 {
3556 struct vc_data *vc;
3557 int ret = 0;
3558
3559 fg_console = saved_fg_console;
3560 last_console = saved_last_console;
3561 want_console = saved_want_console;
3562 console_blanked = saved_console_blanked;
3563 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3564
3565 vc = vc_cons[fg_console].d;
3566 if (vc->vc_sw->con_debug_leave)
3567 ret = vc->vc_sw->con_debug_leave(vc);
3568 return ret;
3569 }
3570 EXPORT_SYMBOL_GPL(con_debug_leave);
3571
3572 static int do_register_con_driver(const struct consw *csw, int first, int last)
3573 {
3574 struct module *owner = csw->owner;
3575 struct con_driver *con_driver;
3576 const char *desc;
3577 int i, retval;
3578
3579 WARN_CONSOLE_UNLOCKED();
3580
3581 if (!try_module_get(owner))
3582 return -ENODEV;
3583
3584 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3585 con_driver = &registered_con_driver[i];
3586
3587 /* already registered */
3588 if (con_driver->con == csw) {
3589 retval = -EBUSY;
3590 goto err;
3591 }
3592 }
3593
3594 desc = csw->con_startup();
3595 if (!desc) {
3596 retval = -ENODEV;
3597 goto err;
3598 }
3599
3600 retval = -EINVAL;
3601
3602 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3603 con_driver = &registered_con_driver[i];
3604
3605 if (con_driver->con == NULL &&
3606 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3607 con_driver->con = csw;
3608 con_driver->desc = desc;
3609 con_driver->node = i;
3610 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3611 CON_DRIVER_FLAG_INIT;
3612 con_driver->first = first;
3613 con_driver->last = last;
3614 retval = 0;
3615 break;
3616 }
3617 }
3618
3619 if (retval)
3620 goto err;
3621
3622 con_driver->dev =
3623 device_create_with_groups(vtconsole_class, NULL,
3624 MKDEV(0, con_driver->node),
3625 con_driver, con_dev_groups,
3626 "vtcon%i", con_driver->node);
3627 if (IS_ERR(con_driver->dev)) {
3628 pr_warn("Unable to create device for %s; errno = %ld\n",
3629 con_driver->desc, PTR_ERR(con_driver->dev));
3630 con_driver->dev = NULL;
3631 } else {
3632 vtconsole_init_device(con_driver);
3633 }
3634
3635 err:
3636 module_put(owner);
3637 return retval;
3638 }
3639
3640
3641 /**
3642 * do_unregister_con_driver - unregister console driver from console layer
3643 * @csw: console driver
3644 *
3645 * DESCRIPTION: All drivers that registers to the console layer must
3646 * call this function upon exit, or if the console driver is in a state
3647 * where it won't be able to handle console services, such as the
3648 * framebuffer console without loaded framebuffer drivers.
3649 *
3650 * The driver must unbind first prior to unregistration.
3651 */
3652 int do_unregister_con_driver(const struct consw *csw)
3653 {
3654 int i;
3655
3656 /* cannot unregister a bound driver */
3657 if (con_is_bound(csw))
3658 return -EBUSY;
3659
3660 if (csw == conswitchp)
3661 return -EINVAL;
3662
3663 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3664 struct con_driver *con_driver = &registered_con_driver[i];
3665
3666 if (con_driver->con == csw) {
3667 /*
3668 * Defer the removal of the sysfs entries since that
3669 * will acquire the kernfs s_active lock and we can't
3670 * acquire this lock while holding the console lock:
3671 * the unbind sysfs entry imposes already the opposite
3672 * order. Reset con already here to prevent any later
3673 * lookup to succeed and mark this slot as zombie, so
3674 * it won't get reused until we complete the removal
3675 * in the deferred work.
3676 */
3677 con_driver->con = NULL;
3678 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3679 schedule_work(&con_driver_unregister_work);
3680
3681 return 0;
3682 }
3683 }
3684
3685 return -ENODEV;
3686 }
3687 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3688
3689 static void con_driver_unregister_callback(struct work_struct *ignored)
3690 {
3691 int i;
3692
3693 console_lock();
3694
3695 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3696 struct con_driver *con_driver = &registered_con_driver[i];
3697
3698 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3699 continue;
3700
3701 console_unlock();
3702
3703 vtconsole_deinit_device(con_driver);
3704 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3705
3706 console_lock();
3707
3708 if (WARN_ON_ONCE(con_driver->con))
3709 con_driver->con = NULL;
3710 con_driver->desc = NULL;
3711 con_driver->dev = NULL;
3712 con_driver->node = 0;
3713 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3714 con_driver->flag = 0;
3715 con_driver->first = 0;
3716 con_driver->last = 0;
3717 }
3718
3719 console_unlock();
3720 }
3721
3722 /*
3723 * If we support more console drivers, this function is used
3724 * when a driver wants to take over some existing consoles
3725 * and become default driver for newly opened ones.
3726 *
3727 * do_take_over_console is basically a register followed by unbind
3728 */
3729 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3730 {
3731 int err;
3732
3733 err = do_register_con_driver(csw, first, last);
3734 /*
3735 * If we get an busy error we still want to bind the console driver
3736 * and return success, as we may have unbound the console driver
3737 * but not unregistered it.
3738 */
3739 if (err == -EBUSY)
3740 err = 0;
3741 if (!err)
3742 do_bind_con_driver(csw, first, last, deflt);
3743
3744 return err;
3745 }
3746 EXPORT_SYMBOL_GPL(do_take_over_console);
3747
3748
3749 /*
3750 * give_up_console is a wrapper to unregister_con_driver. It will only
3751 * work if driver is fully unbound.
3752 */
3753 void give_up_console(const struct consw *csw)
3754 {
3755 console_lock();
3756 do_unregister_con_driver(csw);
3757 console_unlock();
3758 }
3759
3760 static int __init vtconsole_class_init(void)
3761 {
3762 int i;
3763
3764 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3765 if (IS_ERR(vtconsole_class)) {
3766 pr_warn("Unable to create vt console class; errno = %ld\n",
3767 PTR_ERR(vtconsole_class));
3768 vtconsole_class = NULL;
3769 }
3770
3771 /* Add system drivers to sysfs */
3772 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3773 struct con_driver *con = &registered_con_driver[i];
3774
3775 if (con->con && !con->dev) {
3776 con->dev =
3777 device_create_with_groups(vtconsole_class, NULL,
3778 MKDEV(0, con->node),
3779 con, con_dev_groups,
3780 "vtcon%i", con->node);
3781
3782 if (IS_ERR(con->dev)) {
3783 pr_warn("Unable to create device for %s; errno = %ld\n",
3784 con->desc, PTR_ERR(con->dev));
3785 con->dev = NULL;
3786 } else {
3787 vtconsole_init_device(con);
3788 }
3789 }
3790 }
3791
3792 return 0;
3793 }
3794 postcore_initcall(vtconsole_class_init);
3795
3796 #endif
3797
3798 /*
3799 * Screen blanking
3800 */
3801
3802 static int set_vesa_blanking(char __user *p)
3803 {
3804 unsigned int mode;
3805
3806 if (get_user(mode, p + 1))
3807 return -EFAULT;
3808
3809 vesa_blank_mode = (mode < 4) ? mode : 0;
3810 return 0;
3811 }
3812
3813 void do_blank_screen(int entering_gfx)
3814 {
3815 struct vc_data *vc = vc_cons[fg_console].d;
3816 int i;
3817
3818 WARN_CONSOLE_UNLOCKED();
3819
3820 if (console_blanked) {
3821 if (blank_state == blank_vesa_wait) {
3822 blank_state = blank_off;
3823 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3824 }
3825 return;
3826 }
3827
3828 /* entering graphics mode? */
3829 if (entering_gfx) {
3830 hide_cursor(vc);
3831 save_screen(vc);
3832 vc->vc_sw->con_blank(vc, -1, 1);
3833 console_blanked = fg_console + 1;
3834 blank_state = blank_off;
3835 set_origin(vc);
3836 return;
3837 }
3838
3839 if (blank_state != blank_normal_wait)
3840 return;
3841 blank_state = blank_off;
3842
3843 /* don't blank graphics */
3844 if (vc->vc_mode != KD_TEXT) {
3845 console_blanked = fg_console + 1;
3846 return;
3847 }
3848
3849 hide_cursor(vc);
3850 del_timer_sync(&console_timer);
3851 blank_timer_expired = 0;
3852
3853 save_screen(vc);
3854 /* In case we need to reset origin, blanking hook returns 1 */
3855 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3856 console_blanked = fg_console + 1;
3857 if (i)
3858 set_origin(vc);
3859
3860 if (console_blank_hook && console_blank_hook(1))
3861 return;
3862
3863 if (vesa_off_interval && vesa_blank_mode) {
3864 blank_state = blank_vesa_wait;
3865 mod_timer(&console_timer, jiffies + vesa_off_interval);
3866 }
3867 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3868 }
3869 EXPORT_SYMBOL(do_blank_screen);
3870
3871 /*
3872 * Called by timer as well as from vt_console_driver
3873 */
3874 void do_unblank_screen(int leaving_gfx)
3875 {
3876 struct vc_data *vc;
3877
3878 /* This should now always be called from a "sane" (read: can schedule)
3879 * context for the sake of the low level drivers, except in the special
3880 * case of oops_in_progress
3881 */
3882 if (!oops_in_progress)
3883 might_sleep();
3884
3885 WARN_CONSOLE_UNLOCKED();
3886
3887 ignore_poke = 0;
3888 if (!console_blanked)
3889 return;
3890 if (!vc_cons_allocated(fg_console)) {
3891 /* impossible */
3892 pr_warn("unblank_screen: tty %d not allocated ??\n",
3893 fg_console + 1);
3894 return;
3895 }
3896 vc = vc_cons[fg_console].d;
3897 /* Try to unblank in oops case too */
3898 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3899 return; /* but leave console_blanked != 0 */
3900
3901 if (blankinterval) {
3902 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3903 blank_state = blank_normal_wait;
3904 }
3905
3906 console_blanked = 0;
3907 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3908 /* Low-level driver cannot restore -> do it ourselves */
3909 update_screen(vc);
3910 if (console_blank_hook)
3911 console_blank_hook(0);
3912 set_palette(vc);
3913 set_cursor(vc);
3914 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3915 }
3916 EXPORT_SYMBOL(do_unblank_screen);
3917
3918 /*
3919 * This is called by the outside world to cause a forced unblank, mostly for
3920 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3921 * call it with 1 as an argument and so force a mode restore... that may kill
3922 * X or at least garbage the screen but would also make the Oops visible...
3923 */
3924 void unblank_screen(void)
3925 {
3926 do_unblank_screen(0);
3927 }
3928
3929 /*
3930 * We defer the timer blanking to work queue so it can take the console mutex
3931 * (console operations can still happen at irq time, but only from printk which
3932 * has the console mutex. Not perfect yet, but better than no locking
3933 */
3934 static void blank_screen_t(struct timer_list *unused)
3935 {
3936 blank_timer_expired = 1;
3937 schedule_work(&console_work);
3938 }
3939
3940 void poke_blanked_console(void)
3941 {
3942 WARN_CONSOLE_UNLOCKED();
3943
3944 /* Add this so we quickly catch whoever might call us in a non
3945 * safe context. Nowadays, unblank_screen() isn't to be called in
3946 * atomic contexts and is allowed to schedule (with the special case
3947 * of oops_in_progress, but that isn't of any concern for this
3948 * function. --BenH.
3949 */
3950 might_sleep();
3951
3952 /* This isn't perfectly race free, but a race here would be mostly harmless,
3953 * at worse, we'll do a spurrious blank and it's unlikely
3954 */
3955 del_timer(&console_timer);
3956 blank_timer_expired = 0;
3957
3958 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3959 return;
3960 if (console_blanked)
3961 unblank_screen();
3962 else if (blankinterval) {
3963 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3964 blank_state = blank_normal_wait;
3965 }
3966 }
3967
3968 /*
3969 * Palettes
3970 */
3971
3972 static void set_palette(struct vc_data *vc)
3973 {
3974 WARN_CONSOLE_UNLOCKED();
3975
3976 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3977 vc->vc_sw->con_set_palette(vc, color_table);
3978 }
3979
3980 /*
3981 * Load palette into the DAC registers. arg points to a colour
3982 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3983 */
3984
3985 int con_set_cmap(unsigned char __user *arg)
3986 {
3987 int i, j, k;
3988 unsigned char colormap[3*16];
3989
3990 if (copy_from_user(colormap, arg, sizeof(colormap)))
3991 return -EFAULT;
3992
3993 console_lock();
3994 for (i = k = 0; i < 16; i++) {
3995 default_red[i] = colormap[k++];
3996 default_grn[i] = colormap[k++];
3997 default_blu[i] = colormap[k++];
3998 }
3999 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4000 if (!vc_cons_allocated(i))
4001 continue;
4002 for (j = k = 0; j < 16; j++) {
4003 vc_cons[i].d->vc_palette[k++] = default_red[j];
4004 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4005 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4006 }
4007 set_palette(vc_cons[i].d);
4008 }
4009 console_unlock();
4010
4011 return 0;
4012 }
4013
4014 int con_get_cmap(unsigned char __user *arg)
4015 {
4016 int i, k;
4017 unsigned char colormap[3*16];
4018
4019 console_lock();
4020 for (i = k = 0; i < 16; i++) {
4021 colormap[k++] = default_red[i];
4022 colormap[k++] = default_grn[i];
4023 colormap[k++] = default_blu[i];
4024 }
4025 console_unlock();
4026
4027 if (copy_to_user(arg, colormap, sizeof(colormap)))
4028 return -EFAULT;
4029
4030 return 0;
4031 }
4032
4033 void reset_palette(struct vc_data *vc)
4034 {
4035 int j, k;
4036 for (j=k=0; j<16; j++) {
4037 vc->vc_palette[k++] = default_red[j];
4038 vc->vc_palette[k++] = default_grn[j];
4039 vc->vc_palette[k++] = default_blu[j];
4040 }
4041 set_palette(vc);
4042 }
4043
4044 /*
4045 * Font switching
4046 *
4047 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4048 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4049 * depending on width) reserved for each character which is kinda wasty, but
4050 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4051 * is up to the actual low-level console-driver convert data into its favorite
4052 * format (maybe we should add a `fontoffset' field to the `display'
4053 * structure so we won't have to convert the fontdata all the time.
4054 * /Jes
4055 */
4056
4057 #define max_font_size 65536
4058
4059 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4060 {
4061 struct console_font font;
4062 int rc = -EINVAL;
4063 int c;
4064
4065 if (op->data) {
4066 font.data = kmalloc(max_font_size, GFP_KERNEL);
4067 if (!font.data)
4068 return -ENOMEM;
4069 } else
4070 font.data = NULL;
4071
4072 console_lock();
4073 if (vc->vc_mode != KD_TEXT)
4074 rc = -EINVAL;
4075 else if (vc->vc_sw->con_font_get)
4076 rc = vc->vc_sw->con_font_get(vc, &font);
4077 else
4078 rc = -ENOSYS;
4079 console_unlock();
4080
4081 if (rc)
4082 goto out;
4083
4084 c = (font.width+7)/8 * 32 * font.charcount;
4085
4086 if (op->data && font.charcount > op->charcount)
4087 rc = -ENOSPC;
4088 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4089 if (font.width > op->width || font.height > op->height)
4090 rc = -ENOSPC;
4091 } else {
4092 if (font.width != 8)
4093 rc = -EIO;
4094 else if ((op->height && font.height > op->height) ||
4095 font.height > 32)
4096 rc = -ENOSPC;
4097 }
4098 if (rc)
4099 goto out;
4100
4101 op->height = font.height;
4102 op->width = font.width;
4103 op->charcount = font.charcount;
4104
4105 if (op->data && copy_to_user(op->data, font.data, c))
4106 rc = -EFAULT;
4107
4108 out:
4109 kfree(font.data);
4110 return rc;
4111 }
4112
4113 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4114 {
4115 struct console_font font;
4116 int rc = -EINVAL;
4117 int size;
4118
4119 if (vc->vc_mode != KD_TEXT)
4120 return -EINVAL;
4121 if (!op->data)
4122 return -EINVAL;
4123 if (op->charcount > 512)
4124 return -EINVAL;
4125 if (op->width <= 0 || op->width > 32 || op->height > 32)
4126 return -EINVAL;
4127 size = (op->width+7)/8 * 32 * op->charcount;
4128 if (size > max_font_size)
4129 return -ENOSPC;
4130
4131 font.data = memdup_user(op->data, size);
4132 if (IS_ERR(font.data))
4133 return PTR_ERR(font.data);
4134
4135 if (!op->height) { /* Need to guess font height [compat] */
4136 int h, i;
4137 u8 *charmap = font.data;
4138
4139 /*
4140 * If from KDFONTOP ioctl, don't allow things which can be done
4141 * in userland,so that we can get rid of this soon
4142 */
4143 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4144 kfree(font.data);
4145 return -EINVAL;
4146 }
4147
4148 for (h = 32; h > 0; h--)
4149 for (i = 0; i < op->charcount; i++)
4150 if (charmap[32*i+h-1])
4151 goto nonzero;
4152
4153 kfree(font.data);
4154 return -EINVAL;
4155
4156 nonzero:
4157 op->height = h;
4158 }
4159
4160 font.charcount = op->charcount;
4161 font.width = op->width;
4162 font.height = op->height;
4163
4164 console_lock();
4165 if (vc->vc_mode != KD_TEXT)
4166 rc = -EINVAL;
4167 else if (vc->vc_sw->con_font_set)
4168 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4169 else
4170 rc = -ENOSYS;
4171 console_unlock();
4172 kfree(font.data);
4173 return rc;
4174 }
4175
4176 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4177 {
4178 struct console_font font = {.width = op->width, .height = op->height};
4179 char name[MAX_FONT_NAME];
4180 char *s = name;
4181 int rc;
4182
4183
4184 if (!op->data)
4185 s = NULL;
4186 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4187 return -EFAULT;
4188 else
4189 name[MAX_FONT_NAME - 1] = 0;
4190
4191 console_lock();
4192 if (vc->vc_mode != KD_TEXT) {
4193 console_unlock();
4194 return -EINVAL;
4195 }
4196 if (vc->vc_sw->con_font_default)
4197 rc = vc->vc_sw->con_font_default(vc, &font, s);
4198 else
4199 rc = -ENOSYS;
4200 console_unlock();
4201 if (!rc) {
4202 op->width = font.width;
4203 op->height = font.height;
4204 }
4205 return rc;
4206 }
4207
4208 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4209 {
4210 int con = op->height;
4211 int rc;
4212
4213
4214 console_lock();
4215 if (vc->vc_mode != KD_TEXT)
4216 rc = -EINVAL;
4217 else if (!vc->vc_sw->con_font_copy)
4218 rc = -ENOSYS;
4219 else if (con < 0 || !vc_cons_allocated(con))
4220 rc = -ENOTTY;
4221 else if (con == vc->vc_num) /* nothing to do */
4222 rc = 0;
4223 else
4224 rc = vc->vc_sw->con_font_copy(vc, con);
4225 console_unlock();
4226 return rc;
4227 }
4228
4229 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4230 {
4231 switch (op->op) {
4232 case KD_FONT_OP_SET:
4233 return con_font_set(vc, op);
4234 case KD_FONT_OP_GET:
4235 return con_font_get(vc, op);
4236 case KD_FONT_OP_SET_DEFAULT:
4237 return con_font_default(vc, op);
4238 case KD_FONT_OP_COPY:
4239 return con_font_copy(vc, op);
4240 }
4241 return -ENOSYS;
4242 }
4243
4244 /*
4245 * Interface exported to selection and vcs.
4246 */
4247
4248 /* used by selection */
4249 u16 screen_glyph(struct vc_data *vc, int offset)
4250 {
4251 u16 w = scr_readw(screenpos(vc, offset, 1));
4252 u16 c = w & 0xff;
4253
4254 if (w & vc->vc_hi_font_mask)
4255 c |= 0x100;
4256 return c;
4257 }
4258 EXPORT_SYMBOL_GPL(screen_glyph);
4259
4260 /* used by vcs - note the word offset */
4261 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4262 {
4263 return screenpos(vc, 2 * w_offset, viewed);
4264 }
4265 EXPORT_SYMBOL_GPL(screen_pos);
4266
4267 void getconsxy(struct vc_data *vc, unsigned char *p)
4268 {
4269 p[0] = vc->vc_x;
4270 p[1] = vc->vc_y;
4271 }
4272
4273 void putconsxy(struct vc_data *vc, unsigned char *p)
4274 {
4275 hide_cursor(vc);
4276 gotoxy(vc, p[0], p[1]);
4277 set_cursor(vc);
4278 }
4279
4280 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4281 {
4282 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4283 return softcursor_original;
4284 return scr_readw(org);
4285 }
4286
4287 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4288 {
4289 scr_writew(val, org);
4290 if ((unsigned long)org == vc->vc_pos) {
4291 softcursor_original = -1;
4292 add_softcursor(vc);
4293 }
4294 }
4295
4296 void vcs_scr_updated(struct vc_data *vc)
4297 {
4298 notify_update(vc);
4299 }
4300
4301 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4302 unsigned int rolled_over, void *base, unsigned int size)
4303 {
4304 unsigned long ubase = (unsigned long)base;
4305 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4306 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4307 ptrdiff_t origin = (void *)c->vc_origin - base;
4308 int margin = c->vc_size_row * 4;
4309 int from, wrap, from_off, avail;
4310
4311 /* Turn scrollback off */
4312 if (!lines) {
4313 c->vc_visible_origin = c->vc_origin;
4314 return;
4315 }
4316
4317 /* Do we have already enough to allow jumping from 0 to the end? */
4318 if (rolled_over > scr_end + margin) {
4319 from = scr_end;
4320 wrap = rolled_over + c->vc_size_row;
4321 } else {
4322 from = 0;
4323 wrap = size;
4324 }
4325
4326 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4327 avail = (origin - from + wrap) % wrap;
4328
4329 /* Only a little piece would be left? Show all incl. the piece! */
4330 if (avail < 2 * margin)
4331 margin = 0;
4332 if (from_off < margin)
4333 from_off = 0;
4334 if (from_off > avail - margin)
4335 from_off = avail;
4336
4337 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4338 }
4339 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4340
4341 /*
4342 * Visible symbols for modules
4343 */
4344
4345 EXPORT_SYMBOL(color_table);
4346 EXPORT_SYMBOL(default_red);
4347 EXPORT_SYMBOL(default_grn);
4348 EXPORT_SYMBOL(default_blu);
4349 EXPORT_SYMBOL(update_region);
4350 EXPORT_SYMBOL(redraw_screen);
4351 EXPORT_SYMBOL(vc_resize);
4352 EXPORT_SYMBOL(fg_console);
4353 EXPORT_SYMBOL(console_blank_hook);
4354 EXPORT_SYMBOL(console_blanked);
4355 EXPORT_SYMBOL(vc_cons);
4356 EXPORT_SYMBOL(global_cursor_default);
4357 #ifndef VT_SINGLE_DRIVER
4358 EXPORT_SYMBOL(give_up_console);
4359 #endif
Linux with added FPC-III support