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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(unsigned long dummy);
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 = kmalloc(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 = kmalloc(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 3: /* erase scroll-back buffer (and whole display) */
1182 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1183 vc->vc_screenbuf_size);
1184 flush_scrollback(vc);
1185 set_origin(vc);
1186 if (con_is_visible(vc))
1187 update_screen(vc);
1188 /* fall through */
1189 case 2: /* erase whole display */
1190 count = vc->vc_cols * vc->vc_rows;
1191 start = (unsigned short *)vc->vc_origin;
1192 break;
1193 default:
1194 return;
1195 }
1196 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1197 if (con_should_update(vc))
1198 do_update_region(vc, (unsigned long) start, count);
1199 vc->vc_need_wrap = 0;
1200 }
1201
1202 static void csi_K(struct vc_data *vc, int vpar)
1203 {
1204 unsigned int count;
1205 unsigned short * start;
1206
1207 switch (vpar) {
1208 case 0: /* erase from cursor to end of line */
1209 count = vc->vc_cols - vc->vc_x;
1210 start = (unsigned short *)vc->vc_pos;
1211 break;
1212 case 1: /* erase from start of line to cursor */
1213 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1214 count = vc->vc_x + 1;
1215 break;
1216 case 2: /* erase whole line */
1217 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1218 count = vc->vc_cols;
1219 break;
1220 default:
1221 return;
1222 }
1223 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1224 vc->vc_need_wrap = 0;
1225 if (con_should_update(vc))
1226 do_update_region(vc, (unsigned long) start, count);
1227 }
1228
1229 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1230 { /* not vt100? */
1231 int count;
1232
1233 if (!vpar)
1234 vpar++;
1235 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1236
1237 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1238 if (con_should_update(vc))
1239 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1240 vc->vc_need_wrap = 0;
1241 }
1242
1243 static void default_attr(struct vc_data *vc)
1244 {
1245 vc->vc_intensity = 1;
1246 vc->vc_italic = 0;
1247 vc->vc_underline = 0;
1248 vc->vc_reverse = 0;
1249 vc->vc_blink = 0;
1250 vc->vc_color = vc->vc_def_color;
1251 }
1252
1253 struct rgb { u8 r; u8 g; u8 b; };
1254
1255 static void rgb_from_256(int i, struct rgb *c)
1256 {
1257 if (i < 8) { /* Standard colours. */
1258 c->r = i&1 ? 0xaa : 0x00;
1259 c->g = i&2 ? 0xaa : 0x00;
1260 c->b = i&4 ? 0xaa : 0x00;
1261 } else if (i < 16) {
1262 c->r = i&1 ? 0xff : 0x55;
1263 c->g = i&2 ? 0xff : 0x55;
1264 c->b = i&4 ? 0xff : 0x55;
1265 } else if (i < 232) { /* 6x6x6 colour cube. */
1266 c->r = (i - 16) / 36 * 85 / 2;
1267 c->g = (i - 16) / 6 % 6 * 85 / 2;
1268 c->b = (i - 16) % 6 * 85 / 2;
1269 } else /* Grayscale ramp. */
1270 c->r = c->g = c->b = i * 10 - 2312;
1271 }
1272
1273 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1274 {
1275 u8 hue = 0, max = max3(c->r, c->g, c->b);
1276
1277 if (c->r > max / 2)
1278 hue |= 4;
1279 if (c->g > max / 2)
1280 hue |= 2;
1281 if (c->b > max / 2)
1282 hue |= 1;
1283
1284 if (hue == 7 && max <= 0x55) {
1285 hue = 0;
1286 vc->vc_intensity = 2;
1287 } else if (max > 0xaa)
1288 vc->vc_intensity = 2;
1289 else
1290 vc->vc_intensity = 1;
1291
1292 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1293 }
1294
1295 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1296 {
1297 /* For backgrounds, err on the dark side. */
1298 vc->vc_color = (vc->vc_color & 0x0f)
1299 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1300 }
1301
1302 /*
1303 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1304 * and thus need to be detected and ignored by hand. Strictly speaking, that
1305 * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1306 * no one produces such codes and almost no one accepts them.
1307 *
1308 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1309 * supporting them.
1310 */
1311 static int vc_t416_color(struct vc_data *vc, int i,
1312 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1313 {
1314 struct rgb c;
1315
1316 i++;
1317 if (i > vc->vc_npar)
1318 return i;
1319
1320 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1321 /* 256 colours */
1322 i++;
1323 rgb_from_256(vc->vc_par[i], &c);
1324 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1325 /* 24 bit */
1326 c.r = vc->vc_par[i + 1];
1327 c.g = vc->vc_par[i + 2];
1328 c.b = vc->vc_par[i + 3];
1329 i += 3;
1330 } else
1331 return i;
1332
1333 set_color(vc, &c);
1334
1335 return i;
1336 }
1337
1338 /* console_lock is held */
1339 static void csi_m(struct vc_data *vc)
1340 {
1341 int i;
1342
1343 for (i = 0; i <= vc->vc_npar; i++)
1344 switch (vc->vc_par[i]) {
1345 case 0: /* all attributes off */
1346 default_attr(vc);
1347 break;
1348 case 1:
1349 vc->vc_intensity = 2;
1350 break;
1351 case 2:
1352 vc->vc_intensity = 0;
1353 break;
1354 case 3:
1355 vc->vc_italic = 1;
1356 break;
1357 case 4:
1358 vc->vc_underline = 1;
1359 break;
1360 case 5:
1361 vc->vc_blink = 1;
1362 break;
1363 case 7:
1364 vc->vc_reverse = 1;
1365 break;
1366 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1367 * Select primary font, don't display control chars if
1368 * defined, don't set bit 8 on output.
1369 */
1370 vc->vc_translate = set_translate(vc->vc_charset == 0
1371 ? vc->vc_G0_charset
1372 : vc->vc_G1_charset, vc);
1373 vc->vc_disp_ctrl = 0;
1374 vc->vc_toggle_meta = 0;
1375 break;
1376 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1377 * Select first alternate font, lets chars < 32 be
1378 * displayed as ROM chars.
1379 */
1380 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1381 vc->vc_disp_ctrl = 1;
1382 vc->vc_toggle_meta = 0;
1383 break;
1384 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1385 * Select second alternate font, toggle high bit
1386 * before displaying as ROM char.
1387 */
1388 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1389 vc->vc_disp_ctrl = 1;
1390 vc->vc_toggle_meta = 1;
1391 break;
1392 case 21:
1393 case 22:
1394 vc->vc_intensity = 1;
1395 break;
1396 case 23:
1397 vc->vc_italic = 0;
1398 break;
1399 case 24:
1400 vc->vc_underline = 0;
1401 break;
1402 case 25:
1403 vc->vc_blink = 0;
1404 break;
1405 case 27:
1406 vc->vc_reverse = 0;
1407 break;
1408 case 38:
1409 i = vc_t416_color(vc, i, rgb_foreground);
1410 break;
1411 case 48:
1412 i = vc_t416_color(vc, i, rgb_background);
1413 break;
1414 case 39:
1415 vc->vc_color = (vc->vc_def_color & 0x0f) |
1416 (vc->vc_color & 0xf0);
1417 break;
1418 case 49:
1419 vc->vc_color = (vc->vc_def_color & 0xf0) |
1420 (vc->vc_color & 0x0f);
1421 break;
1422 default:
1423 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1424 if (vc->vc_par[i] < 100)
1425 vc->vc_intensity = 2;
1426 vc->vc_par[i] -= 60;
1427 }
1428 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1429 vc->vc_color = color_table[vc->vc_par[i] - 30]
1430 | (vc->vc_color & 0xf0);
1431 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1432 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1433 | (vc->vc_color & 0x0f);
1434 break;
1435 }
1436 update_attr(vc);
1437 }
1438
1439 static void respond_string(const char *p, struct tty_port *port)
1440 {
1441 while (*p) {
1442 tty_insert_flip_char(port, *p, 0);
1443 p++;
1444 }
1445 tty_schedule_flip(port);
1446 }
1447
1448 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1449 {
1450 char buf[40];
1451
1452 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1453 respond_string(buf, tty->port);
1454 }
1455
1456 static inline void status_report(struct tty_struct *tty)
1457 {
1458 respond_string("\033[0n", tty->port); /* Terminal ok */
1459 }
1460
1461 static inline void respond_ID(struct tty_struct *tty)
1462 {
1463 respond_string(VT102ID, tty->port);
1464 }
1465
1466 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1467 {
1468 char buf[8];
1469
1470 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1471 (char)('!' + mry));
1472 respond_string(buf, tty->port);
1473 }
1474
1475 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1476 int mouse_reporting(void)
1477 {
1478 return vc_cons[fg_console].d->vc_report_mouse;
1479 }
1480
1481 /* console_lock is held */
1482 static void set_mode(struct vc_data *vc, int on_off)
1483 {
1484 int i;
1485
1486 for (i = 0; i <= vc->vc_npar; i++)
1487 if (vc->vc_ques) {
1488 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1489 case 1: /* Cursor keys send ^[Ox/^[[x */
1490 if (on_off)
1491 set_kbd(vc, decckm);
1492 else
1493 clr_kbd(vc, decckm);
1494 break;
1495 case 3: /* 80/132 mode switch unimplemented */
1496 #if 0
1497 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1498 /* this alone does not suffice; some user mode
1499 utility has to change the hardware regs */
1500 #endif
1501 break;
1502 case 5: /* Inverted screen on/off */
1503 if (vc->vc_decscnm != on_off) {
1504 vc->vc_decscnm = on_off;
1505 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1506 update_attr(vc);
1507 }
1508 break;
1509 case 6: /* Origin relative/absolute */
1510 vc->vc_decom = on_off;
1511 gotoxay(vc, 0, 0);
1512 break;
1513 case 7: /* Autowrap on/off */
1514 vc->vc_decawm = on_off;
1515 break;
1516 case 8: /* Autorepeat on/off */
1517 if (on_off)
1518 set_kbd(vc, decarm);
1519 else
1520 clr_kbd(vc, decarm);
1521 break;
1522 case 9:
1523 vc->vc_report_mouse = on_off ? 1 : 0;
1524 break;
1525 case 25: /* Cursor on/off */
1526 vc->vc_deccm = on_off;
1527 break;
1528 case 1000:
1529 vc->vc_report_mouse = on_off ? 2 : 0;
1530 break;
1531 }
1532 } else {
1533 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1534 case 3: /* Monitor (display ctrls) */
1535 vc->vc_disp_ctrl = on_off;
1536 break;
1537 case 4: /* Insert Mode on/off */
1538 vc->vc_decim = on_off;
1539 break;
1540 case 20: /* Lf, Enter == CrLf/Lf */
1541 if (on_off)
1542 set_kbd(vc, lnm);
1543 else
1544 clr_kbd(vc, lnm);
1545 break;
1546 }
1547 }
1548 }
1549
1550 /* console_lock is held */
1551 static void setterm_command(struct vc_data *vc)
1552 {
1553 switch(vc->vc_par[0]) {
1554 case 1: /* set color for underline mode */
1555 if (vc->vc_can_do_color &&
1556 vc->vc_par[1] < 16) {
1557 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1558 if (vc->vc_underline)
1559 update_attr(vc);
1560 }
1561 break;
1562 case 2: /* set color for half intensity mode */
1563 if (vc->vc_can_do_color &&
1564 vc->vc_par[1] < 16) {
1565 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1566 if (vc->vc_intensity == 0)
1567 update_attr(vc);
1568 }
1569 break;
1570 case 8: /* store colors as defaults */
1571 vc->vc_def_color = vc->vc_attr;
1572 if (vc->vc_hi_font_mask == 0x100)
1573 vc->vc_def_color >>= 1;
1574 default_attr(vc);
1575 update_attr(vc);
1576 break;
1577 case 9: /* set blanking interval */
1578 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1579 poke_blanked_console();
1580 break;
1581 case 10: /* set bell frequency in Hz */
1582 if (vc->vc_npar >= 1)
1583 vc->vc_bell_pitch = vc->vc_par[1];
1584 else
1585 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1586 break;
1587 case 11: /* set bell duration in msec */
1588 if (vc->vc_npar >= 1)
1589 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1590 msecs_to_jiffies(vc->vc_par[1]) : 0;
1591 else
1592 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1593 break;
1594 case 12: /* bring specified console to the front */
1595 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1596 set_console(vc->vc_par[1] - 1);
1597 break;
1598 case 13: /* unblank the screen */
1599 poke_blanked_console();
1600 break;
1601 case 14: /* set vesa powerdown interval */
1602 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1603 break;
1604 case 15: /* activate the previous console */
1605 set_console(last_console);
1606 break;
1607 case 16: /* set cursor blink duration in msec */
1608 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1609 vc->vc_par[1] <= USHRT_MAX)
1610 vc->vc_cur_blink_ms = vc->vc_par[1];
1611 else
1612 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1613 break;
1614 }
1615 }
1616
1617 /* console_lock is held */
1618 static void csi_at(struct vc_data *vc, unsigned int nr)
1619 {
1620 if (nr > vc->vc_cols - vc->vc_x)
1621 nr = vc->vc_cols - vc->vc_x;
1622 else if (!nr)
1623 nr = 1;
1624 insert_char(vc, nr);
1625 }
1626
1627 /* console_lock is held */
1628 static void csi_L(struct vc_data *vc, unsigned int nr)
1629 {
1630 if (nr > vc->vc_rows - vc->vc_y)
1631 nr = vc->vc_rows - vc->vc_y;
1632 else if (!nr)
1633 nr = 1;
1634 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1635 vc->vc_need_wrap = 0;
1636 }
1637
1638 /* console_lock is held */
1639 static void csi_P(struct vc_data *vc, unsigned int nr)
1640 {
1641 if (nr > vc->vc_cols - vc->vc_x)
1642 nr = vc->vc_cols - vc->vc_x;
1643 else if (!nr)
1644 nr = 1;
1645 delete_char(vc, nr);
1646 }
1647
1648 /* console_lock is held */
1649 static void csi_M(struct vc_data *vc, unsigned int nr)
1650 {
1651 if (nr > vc->vc_rows - vc->vc_y)
1652 nr = vc->vc_rows - vc->vc_y;
1653 else if (!nr)
1654 nr=1;
1655 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1656 vc->vc_need_wrap = 0;
1657 }
1658
1659 /* console_lock is held (except via vc_init->reset_terminal */
1660 static void save_cur(struct vc_data *vc)
1661 {
1662 vc->vc_saved_x = vc->vc_x;
1663 vc->vc_saved_y = vc->vc_y;
1664 vc->vc_s_intensity = vc->vc_intensity;
1665 vc->vc_s_italic = vc->vc_italic;
1666 vc->vc_s_underline = vc->vc_underline;
1667 vc->vc_s_blink = vc->vc_blink;
1668 vc->vc_s_reverse = vc->vc_reverse;
1669 vc->vc_s_charset = vc->vc_charset;
1670 vc->vc_s_color = vc->vc_color;
1671 vc->vc_saved_G0 = vc->vc_G0_charset;
1672 vc->vc_saved_G1 = vc->vc_G1_charset;
1673 }
1674
1675 /* console_lock is held */
1676 static void restore_cur(struct vc_data *vc)
1677 {
1678 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1679 vc->vc_intensity = vc->vc_s_intensity;
1680 vc->vc_italic = vc->vc_s_italic;
1681 vc->vc_underline = vc->vc_s_underline;
1682 vc->vc_blink = vc->vc_s_blink;
1683 vc->vc_reverse = vc->vc_s_reverse;
1684 vc->vc_charset = vc->vc_s_charset;
1685 vc->vc_color = vc->vc_s_color;
1686 vc->vc_G0_charset = vc->vc_saved_G0;
1687 vc->vc_G1_charset = vc->vc_saved_G1;
1688 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1689 update_attr(vc);
1690 vc->vc_need_wrap = 0;
1691 }
1692
1693 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1694 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1695 ESpalette, ESosc };
1696
1697 /* console_lock is held (except via vc_init()) */
1698 static void reset_terminal(struct vc_data *vc, int do_clear)
1699 {
1700 vc->vc_top = 0;
1701 vc->vc_bottom = vc->vc_rows;
1702 vc->vc_state = ESnormal;
1703 vc->vc_ques = 0;
1704 vc->vc_translate = set_translate(LAT1_MAP, vc);
1705 vc->vc_G0_charset = LAT1_MAP;
1706 vc->vc_G1_charset = GRAF_MAP;
1707 vc->vc_charset = 0;
1708 vc->vc_need_wrap = 0;
1709 vc->vc_report_mouse = 0;
1710 vc->vc_utf = default_utf8;
1711 vc->vc_utf_count = 0;
1712
1713 vc->vc_disp_ctrl = 0;
1714 vc->vc_toggle_meta = 0;
1715
1716 vc->vc_decscnm = 0;
1717 vc->vc_decom = 0;
1718 vc->vc_decawm = 1;
1719 vc->vc_deccm = global_cursor_default;
1720 vc->vc_decim = 0;
1721
1722 vt_reset_keyboard(vc->vc_num);
1723
1724 vc->vc_cursor_type = cur_default;
1725 vc->vc_complement_mask = vc->vc_s_complement_mask;
1726
1727 default_attr(vc);
1728 update_attr(vc);
1729
1730 vc->vc_tab_stop[0] = 0x01010100;
1731 vc->vc_tab_stop[1] =
1732 vc->vc_tab_stop[2] =
1733 vc->vc_tab_stop[3] =
1734 vc->vc_tab_stop[4] =
1735 vc->vc_tab_stop[5] =
1736 vc->vc_tab_stop[6] =
1737 vc->vc_tab_stop[7] = 0x01010101;
1738
1739 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1740 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1741 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1742
1743 gotoxy(vc, 0, 0);
1744 save_cur(vc);
1745 if (do_clear)
1746 csi_J(vc, 2);
1747 }
1748
1749 /* console_lock is held */
1750 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1751 {
1752 /*
1753 * Control characters can be used in the _middle_
1754 * of an escape sequence.
1755 */
1756 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1757 return;
1758 switch (c) {
1759 case 0:
1760 return;
1761 case 7:
1762 if (vc->vc_state == ESosc)
1763 vc->vc_state = ESnormal;
1764 else if (vc->vc_bell_duration)
1765 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1766 return;
1767 case 8:
1768 bs(vc);
1769 return;
1770 case 9:
1771 vc->vc_pos -= (vc->vc_x << 1);
1772 while (vc->vc_x < vc->vc_cols - 1) {
1773 vc->vc_x++;
1774 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1775 break;
1776 }
1777 vc->vc_pos += (vc->vc_x << 1);
1778 notify_write(vc, '\t');
1779 return;
1780 case 10: case 11: case 12:
1781 lf(vc);
1782 if (!is_kbd(vc, lnm))
1783 return;
1784 case 13:
1785 cr(vc);
1786 return;
1787 case 14:
1788 vc->vc_charset = 1;
1789 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1790 vc->vc_disp_ctrl = 1;
1791 return;
1792 case 15:
1793 vc->vc_charset = 0;
1794 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1795 vc->vc_disp_ctrl = 0;
1796 return;
1797 case 24: case 26:
1798 vc->vc_state = ESnormal;
1799 return;
1800 case 27:
1801 vc->vc_state = ESesc;
1802 return;
1803 case 127:
1804 del(vc);
1805 return;
1806 case 128+27:
1807 vc->vc_state = ESsquare;
1808 return;
1809 }
1810 switch(vc->vc_state) {
1811 case ESesc:
1812 vc->vc_state = ESnormal;
1813 switch (c) {
1814 case '[':
1815 vc->vc_state = ESsquare;
1816 return;
1817 case ']':
1818 vc->vc_state = ESnonstd;
1819 return;
1820 case '%':
1821 vc->vc_state = ESpercent;
1822 return;
1823 case 'E':
1824 cr(vc);
1825 lf(vc);
1826 return;
1827 case 'M':
1828 ri(vc);
1829 return;
1830 case 'D':
1831 lf(vc);
1832 return;
1833 case 'H':
1834 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1835 return;
1836 case 'Z':
1837 respond_ID(tty);
1838 return;
1839 case '7':
1840 save_cur(vc);
1841 return;
1842 case '8':
1843 restore_cur(vc);
1844 return;
1845 case '(':
1846 vc->vc_state = ESsetG0;
1847 return;
1848 case ')':
1849 vc->vc_state = ESsetG1;
1850 return;
1851 case '#':
1852 vc->vc_state = EShash;
1853 return;
1854 case 'c':
1855 reset_terminal(vc, 1);
1856 return;
1857 case '>': /* Numeric keypad */
1858 clr_kbd(vc, kbdapplic);
1859 return;
1860 case '=': /* Appl. keypad */
1861 set_kbd(vc, kbdapplic);
1862 return;
1863 }
1864 return;
1865 case ESnonstd:
1866 if (c=='P') { /* palette escape sequence */
1867 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1868 vc->vc_par[vc->vc_npar] = 0;
1869 vc->vc_npar = 0;
1870 vc->vc_state = ESpalette;
1871 return;
1872 } else if (c=='R') { /* reset palette */
1873 reset_palette(vc);
1874 vc->vc_state = ESnormal;
1875 } else if (c>='0' && c<='9')
1876 vc->vc_state = ESosc;
1877 else
1878 vc->vc_state = ESnormal;
1879 return;
1880 case ESpalette:
1881 if (isxdigit(c)) {
1882 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1883 if (vc->vc_npar == 7) {
1884 int i = vc->vc_par[0] * 3, j = 1;
1885 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1886 vc->vc_palette[i++] += vc->vc_par[j++];
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 set_palette(vc);
1892 vc->vc_state = ESnormal;
1893 }
1894 } else
1895 vc->vc_state = ESnormal;
1896 return;
1897 case ESsquare:
1898 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1899 vc->vc_par[vc->vc_npar] = 0;
1900 vc->vc_npar = 0;
1901 vc->vc_state = ESgetpars;
1902 if (c == '[') { /* Function key */
1903 vc->vc_state=ESfunckey;
1904 return;
1905 }
1906 vc->vc_ques = (c == '?');
1907 if (vc->vc_ques)
1908 return;
1909 case ESgetpars:
1910 if (c == ';' && vc->vc_npar < NPAR - 1) {
1911 vc->vc_npar++;
1912 return;
1913 } else if (c>='0' && c<='9') {
1914 vc->vc_par[vc->vc_npar] *= 10;
1915 vc->vc_par[vc->vc_npar] += c - '0';
1916 return;
1917 }
1918 vc->vc_state = ESnormal;
1919 switch(c) {
1920 case 'h':
1921 set_mode(vc, 1);
1922 return;
1923 case 'l':
1924 set_mode(vc, 0);
1925 return;
1926 case 'c':
1927 if (vc->vc_ques) {
1928 if (vc->vc_par[0])
1929 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1930 else
1931 vc->vc_cursor_type = cur_default;
1932 return;
1933 }
1934 break;
1935 case 'm':
1936 if (vc->vc_ques) {
1937 clear_selection();
1938 if (vc->vc_par[0])
1939 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1940 else
1941 vc->vc_complement_mask = vc->vc_s_complement_mask;
1942 return;
1943 }
1944 break;
1945 case 'n':
1946 if (!vc->vc_ques) {
1947 if (vc->vc_par[0] == 5)
1948 status_report(tty);
1949 else if (vc->vc_par[0] == 6)
1950 cursor_report(vc, tty);
1951 }
1952 return;
1953 }
1954 if (vc->vc_ques) {
1955 vc->vc_ques = 0;
1956 return;
1957 }
1958 switch(c) {
1959 case 'G': case '`':
1960 if (vc->vc_par[0])
1961 vc->vc_par[0]--;
1962 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1963 return;
1964 case 'A':
1965 if (!vc->vc_par[0])
1966 vc->vc_par[0]++;
1967 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1968 return;
1969 case 'B': case 'e':
1970 if (!vc->vc_par[0])
1971 vc->vc_par[0]++;
1972 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1973 return;
1974 case 'C': case 'a':
1975 if (!vc->vc_par[0])
1976 vc->vc_par[0]++;
1977 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1978 return;
1979 case 'D':
1980 if (!vc->vc_par[0])
1981 vc->vc_par[0]++;
1982 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1983 return;
1984 case 'E':
1985 if (!vc->vc_par[0])
1986 vc->vc_par[0]++;
1987 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1988 return;
1989 case 'F':
1990 if (!vc->vc_par[0])
1991 vc->vc_par[0]++;
1992 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1993 return;
1994 case 'd':
1995 if (vc->vc_par[0])
1996 vc->vc_par[0]--;
1997 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1998 return;
1999 case 'H': case 'f':
2000 if (vc->vc_par[0])
2001 vc->vc_par[0]--;
2002 if (vc->vc_par[1])
2003 vc->vc_par[1]--;
2004 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2005 return;
2006 case 'J':
2007 csi_J(vc, vc->vc_par[0]);
2008 return;
2009 case 'K':
2010 csi_K(vc, vc->vc_par[0]);
2011 return;
2012 case 'L':
2013 csi_L(vc, vc->vc_par[0]);
2014 return;
2015 case 'M':
2016 csi_M(vc, vc->vc_par[0]);
2017 return;
2018 case 'P':
2019 csi_P(vc, vc->vc_par[0]);
2020 return;
2021 case 'c':
2022 if (!vc->vc_par[0])
2023 respond_ID(tty);
2024 return;
2025 case 'g':
2026 if (!vc->vc_par[0])
2027 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2028 else if (vc->vc_par[0] == 3) {
2029 vc->vc_tab_stop[0] =
2030 vc->vc_tab_stop[1] =
2031 vc->vc_tab_stop[2] =
2032 vc->vc_tab_stop[3] =
2033 vc->vc_tab_stop[4] =
2034 vc->vc_tab_stop[5] =
2035 vc->vc_tab_stop[6] =
2036 vc->vc_tab_stop[7] = 0;
2037 }
2038 return;
2039 case 'm':
2040 csi_m(vc);
2041 return;
2042 case 'q': /* DECLL - but only 3 leds */
2043 /* map 0,1,2,3 to 0,1,2,4 */
2044 if (vc->vc_par[0] < 4)
2045 vt_set_led_state(vc->vc_num,
2046 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2047 return;
2048 case 'r':
2049 if (!vc->vc_par[0])
2050 vc->vc_par[0]++;
2051 if (!vc->vc_par[1])
2052 vc->vc_par[1] = vc->vc_rows;
2053 /* Minimum allowed region is 2 lines */
2054 if (vc->vc_par[0] < vc->vc_par[1] &&
2055 vc->vc_par[1] <= vc->vc_rows) {
2056 vc->vc_top = vc->vc_par[0] - 1;
2057 vc->vc_bottom = vc->vc_par[1];
2058 gotoxay(vc, 0, 0);
2059 }
2060 return;
2061 case 's':
2062 save_cur(vc);
2063 return;
2064 case 'u':
2065 restore_cur(vc);
2066 return;
2067 case 'X':
2068 csi_X(vc, vc->vc_par[0]);
2069 return;
2070 case '@':
2071 csi_at(vc, vc->vc_par[0]);
2072 return;
2073 case ']': /* setterm functions */
2074 setterm_command(vc);
2075 return;
2076 }
2077 return;
2078 case ESpercent:
2079 vc->vc_state = ESnormal;
2080 switch (c) {
2081 case '@': /* defined in ISO 2022 */
2082 vc->vc_utf = 0;
2083 return;
2084 case 'G': /* prelim official escape code */
2085 case '8': /* retained for compatibility */
2086 vc->vc_utf = 1;
2087 return;
2088 }
2089 return;
2090 case ESfunckey:
2091 vc->vc_state = ESnormal;
2092 return;
2093 case EShash:
2094 vc->vc_state = ESnormal;
2095 if (c == '8') {
2096 /* DEC screen alignment test. kludge :-) */
2097 vc->vc_video_erase_char =
2098 (vc->vc_video_erase_char & 0xff00) | 'E';
2099 csi_J(vc, 2);
2100 vc->vc_video_erase_char =
2101 (vc->vc_video_erase_char & 0xff00) | ' ';
2102 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2103 }
2104 return;
2105 case ESsetG0:
2106 if (c == '0')
2107 vc->vc_G0_charset = GRAF_MAP;
2108 else if (c == 'B')
2109 vc->vc_G0_charset = LAT1_MAP;
2110 else if (c == 'U')
2111 vc->vc_G0_charset = IBMPC_MAP;
2112 else if (c == 'K')
2113 vc->vc_G0_charset = USER_MAP;
2114 if (vc->vc_charset == 0)
2115 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2116 vc->vc_state = ESnormal;
2117 return;
2118 case ESsetG1:
2119 if (c == '0')
2120 vc->vc_G1_charset = GRAF_MAP;
2121 else if (c == 'B')
2122 vc->vc_G1_charset = LAT1_MAP;
2123 else if (c == 'U')
2124 vc->vc_G1_charset = IBMPC_MAP;
2125 else if (c == 'K')
2126 vc->vc_G1_charset = USER_MAP;
2127 if (vc->vc_charset == 1)
2128 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2129 vc->vc_state = ESnormal;
2130 return;
2131 case ESosc:
2132 return;
2133 default:
2134 vc->vc_state = ESnormal;
2135 }
2136 }
2137
2138 /* is_double_width() is based on the wcwidth() implementation by
2139 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2140 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2141 */
2142 struct interval {
2143 uint32_t first;
2144 uint32_t last;
2145 };
2146
2147 static int ucs_cmp(const void *key, const void *elt)
2148 {
2149 uint32_t ucs = *(uint32_t *)key;
2150 struct interval e = *(struct interval *) elt;
2151
2152 if (ucs > e.last)
2153 return 1;
2154 else if (ucs < e.first)
2155 return -1;
2156 return 0;
2157 }
2158
2159 static int is_double_width(uint32_t ucs)
2160 {
2161 static const struct interval double_width[] = {
2162 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2163 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2164 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2165 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2166 };
2167 if (ucs < double_width[0].first ||
2168 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2169 return 0;
2170
2171 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2172 sizeof(struct interval), ucs_cmp) != NULL;
2173 }
2174
2175 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2176 unsigned long draw_to, int *draw_x)
2177 {
2178 if (*draw_x < 0)
2179 return;
2180
2181 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2182 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2183 *draw_x = -1;
2184 }
2185
2186 /* acquires console_lock */
2187 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2188 {
2189 int c, tc, ok, n = 0, draw_x = -1;
2190 unsigned int currcons;
2191 unsigned long draw_from = 0, draw_to = 0;
2192 struct vc_data *vc;
2193 unsigned char vc_attr;
2194 struct vt_notifier_param param;
2195 uint8_t rescan;
2196 uint8_t inverse;
2197 uint8_t width;
2198 u16 himask, charmask;
2199
2200 if (in_interrupt())
2201 return count;
2202
2203 might_sleep();
2204
2205 console_lock();
2206 vc = tty->driver_data;
2207 if (vc == NULL) {
2208 pr_err("vt: argh, driver_data is NULL !\n");
2209 console_unlock();
2210 return 0;
2211 }
2212
2213 currcons = vc->vc_num;
2214 if (!vc_cons_allocated(currcons)) {
2215 /* could this happen? */
2216 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2217 console_unlock();
2218 return 0;
2219 }
2220
2221 himask = vc->vc_hi_font_mask;
2222 charmask = himask ? 0x1ff : 0xff;
2223
2224 /* undraw cursor first */
2225 if (con_is_fg(vc))
2226 hide_cursor(vc);
2227
2228 param.vc = vc;
2229
2230 while (!tty->stopped && count) {
2231 int orig = *buf;
2232 c = orig;
2233 buf++;
2234 n++;
2235 count--;
2236 rescan = 0;
2237 inverse = 0;
2238 width = 1;
2239
2240 /* Do no translation at all in control states */
2241 if (vc->vc_state != ESnormal) {
2242 tc = c;
2243 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2244 /* Combine UTF-8 into Unicode in vc_utf_char.
2245 * vc_utf_count is the number of continuation bytes still
2246 * expected to arrive.
2247 * vc_npar is the number of continuation bytes arrived so
2248 * far
2249 */
2250 rescan_last_byte:
2251 if ((c & 0xc0) == 0x80) {
2252 /* Continuation byte received */
2253 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2254 if (vc->vc_utf_count) {
2255 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2256 vc->vc_npar++;
2257 if (--vc->vc_utf_count) {
2258 /* Still need some bytes */
2259 continue;
2260 }
2261 /* Got a whole character */
2262 c = vc->vc_utf_char;
2263 /* Reject overlong sequences */
2264 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2265 c > utf8_length_changes[vc->vc_npar])
2266 c = 0xfffd;
2267 } else {
2268 /* Unexpected continuation byte */
2269 vc->vc_utf_count = 0;
2270 c = 0xfffd;
2271 }
2272 } else {
2273 /* Single ASCII byte or first byte of a sequence received */
2274 if (vc->vc_utf_count) {
2275 /* Continuation byte expected */
2276 rescan = 1;
2277 vc->vc_utf_count = 0;
2278 c = 0xfffd;
2279 } else if (c > 0x7f) {
2280 /* First byte of a multibyte sequence received */
2281 vc->vc_npar = 0;
2282 if ((c & 0xe0) == 0xc0) {
2283 vc->vc_utf_count = 1;
2284 vc->vc_utf_char = (c & 0x1f);
2285 } else if ((c & 0xf0) == 0xe0) {
2286 vc->vc_utf_count = 2;
2287 vc->vc_utf_char = (c & 0x0f);
2288 } else if ((c & 0xf8) == 0xf0) {
2289 vc->vc_utf_count = 3;
2290 vc->vc_utf_char = (c & 0x07);
2291 } else if ((c & 0xfc) == 0xf8) {
2292 vc->vc_utf_count = 4;
2293 vc->vc_utf_char = (c & 0x03);
2294 } else if ((c & 0xfe) == 0xfc) {
2295 vc->vc_utf_count = 5;
2296 vc->vc_utf_char = (c & 0x01);
2297 } else {
2298 /* 254 and 255 are invalid */
2299 c = 0xfffd;
2300 }
2301 if (vc->vc_utf_count) {
2302 /* Still need some bytes */
2303 continue;
2304 }
2305 }
2306 /* Nothing to do if an ASCII byte was received */
2307 }
2308 /* End of UTF-8 decoding. */
2309 /* c is the received character, or U+FFFD for invalid sequences. */
2310 /* Replace invalid Unicode code points with U+FFFD too */
2311 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2312 c = 0xfffd;
2313 tc = c;
2314 } else { /* no utf or alternate charset mode */
2315 tc = vc_translate(vc, c);
2316 }
2317
2318 param.c = tc;
2319 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2320 &param) == NOTIFY_STOP)
2321 continue;
2322
2323 /* If the original code was a control character we
2324 * only allow a glyph to be displayed if the code is
2325 * not normally used (such as for cursor movement) or
2326 * if the disp_ctrl mode has been explicitly enabled.
2327 * Certain characters (as given by the CTRL_ALWAYS
2328 * bitmap) are always displayed as control characters,
2329 * as the console would be pretty useless without
2330 * them; to display an arbitrary font position use the
2331 * direct-to-font zone in UTF-8 mode.
2332 */
2333 ok = tc && (c >= 32 ||
2334 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2335 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2336 && (c != 127 || vc->vc_disp_ctrl)
2337 && (c != 128+27);
2338
2339 if (vc->vc_state == ESnormal && ok) {
2340 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2341 if (is_double_width(c))
2342 width = 2;
2343 }
2344 /* Now try to find out how to display it */
2345 tc = conv_uni_to_pc(vc, tc);
2346 if (tc & ~charmask) {
2347 if (tc == -1 || tc == -2) {
2348 continue; /* nothing to display */
2349 }
2350 /* Glyph not found */
2351 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2352 /* In legacy mode use the glyph we get by a 1:1 mapping.
2353 This would make absolutely no sense with Unicode in mind,
2354 but do this for ASCII characters since a font may lack
2355 Unicode mapping info and we don't want to end up with
2356 having question marks only. */
2357 tc = c;
2358 } else {
2359 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2360 tc = conv_uni_to_pc(vc, 0xfffd);
2361 if (tc < 0) {
2362 inverse = 1;
2363 tc = conv_uni_to_pc(vc, '?');
2364 if (tc < 0) tc = '?';
2365 }
2366 }
2367 }
2368
2369 if (!inverse) {
2370 vc_attr = vc->vc_attr;
2371 } else {
2372 /* invert vc_attr */
2373 if (!vc->vc_can_do_color) {
2374 vc_attr = (vc->vc_attr) ^ 0x08;
2375 } else if (vc->vc_hi_font_mask == 0x100) {
2376 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2377 } else {
2378 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2379 }
2380 con_flush(vc, draw_from, draw_to, &draw_x);
2381 }
2382
2383 while (1) {
2384 if (vc->vc_need_wrap || vc->vc_decim)
2385 con_flush(vc, draw_from, draw_to,
2386 &draw_x);
2387 if (vc->vc_need_wrap) {
2388 cr(vc);
2389 lf(vc);
2390 }
2391 if (vc->vc_decim)
2392 insert_char(vc, 1);
2393 scr_writew(himask ?
2394 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2395 (vc_attr << 8) + tc,
2396 (u16 *) vc->vc_pos);
2397 if (con_should_update(vc) && draw_x < 0) {
2398 draw_x = vc->vc_x;
2399 draw_from = vc->vc_pos;
2400 }
2401 if (vc->vc_x == vc->vc_cols - 1) {
2402 vc->vc_need_wrap = vc->vc_decawm;
2403 draw_to = vc->vc_pos + 2;
2404 } else {
2405 vc->vc_x++;
2406 draw_to = (vc->vc_pos += 2);
2407 }
2408
2409 if (!--width) break;
2410
2411 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2412 if (tc < 0) tc = ' ';
2413 }
2414 notify_write(vc, c);
2415
2416 if (inverse)
2417 con_flush(vc, draw_from, draw_to, &draw_x);
2418
2419 if (rescan) {
2420 rescan = 0;
2421 inverse = 0;
2422 width = 1;
2423 c = orig;
2424 goto rescan_last_byte;
2425 }
2426 continue;
2427 }
2428 con_flush(vc, draw_from, draw_to, &draw_x);
2429 do_con_trol(tty, vc, orig);
2430 }
2431 con_flush(vc, draw_from, draw_to, &draw_x);
2432 console_conditional_schedule();
2433 console_unlock();
2434 notify_update(vc);
2435 return n;
2436 }
2437
2438 /*
2439 * This is the console switching callback.
2440 *
2441 * Doing console switching in a process context allows
2442 * us to do the switches asynchronously (needed when we want
2443 * to switch due to a keyboard interrupt). Synchronization
2444 * with other console code and prevention of re-entrancy is
2445 * ensured with console_lock.
2446 */
2447 static void console_callback(struct work_struct *ignored)
2448 {
2449 console_lock();
2450
2451 if (want_console >= 0) {
2452 if (want_console != fg_console &&
2453 vc_cons_allocated(want_console)) {
2454 hide_cursor(vc_cons[fg_console].d);
2455 change_console(vc_cons[want_console].d);
2456 /* we only changed when the console had already
2457 been allocated - a new console is not created
2458 in an interrupt routine */
2459 }
2460 want_console = -1;
2461 }
2462 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2463 do_poke_blanked_console = 0;
2464 poke_blanked_console();
2465 }
2466 if (scrollback_delta) {
2467 struct vc_data *vc = vc_cons[fg_console].d;
2468 clear_selection();
2469 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2470 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2471 scrollback_delta = 0;
2472 }
2473 if (blank_timer_expired) {
2474 do_blank_screen(0);
2475 blank_timer_expired = 0;
2476 }
2477 notify_update(vc_cons[fg_console].d);
2478
2479 console_unlock();
2480 }
2481
2482 int set_console(int nr)
2483 {
2484 struct vc_data *vc = vc_cons[fg_console].d;
2485
2486 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2487 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2488
2489 /*
2490 * Console switch will fail in console_callback() or
2491 * change_console() so there is no point scheduling
2492 * the callback
2493 *
2494 * Existing set_console() users don't check the return
2495 * value so this shouldn't break anything
2496 */
2497 return -EINVAL;
2498 }
2499
2500 want_console = nr;
2501 schedule_console_callback();
2502
2503 return 0;
2504 }
2505
2506 struct tty_driver *console_driver;
2507
2508 #ifdef CONFIG_VT_CONSOLE
2509
2510 /**
2511 * vt_kmsg_redirect() - Sets/gets the kernel message console
2512 * @new: The new virtual terminal number or -1 if the console should stay
2513 * unchanged
2514 *
2515 * By default, the kernel messages are always printed on the current virtual
2516 * console. However, the user may modify that default with the
2517 * TIOCL_SETKMSGREDIRECT ioctl call.
2518 *
2519 * This function sets the kernel message console to be @new. It returns the old
2520 * virtual console number. The virtual terminal number 0 (both as parameter and
2521 * return value) means no redirection (i.e. always printed on the currently
2522 * active console).
2523 *
2524 * The parameter -1 means that only the current console is returned, but the
2525 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2526 * case to make the code more understandable.
2527 *
2528 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2529 * the parameter and always returns 0.
2530 */
2531 int vt_kmsg_redirect(int new)
2532 {
2533 static int kmsg_con;
2534
2535 if (new != -1)
2536 return xchg(&kmsg_con, new);
2537 else
2538 return kmsg_con;
2539 }
2540
2541 /*
2542 * Console on virtual terminal
2543 *
2544 * The console must be locked when we get here.
2545 */
2546
2547 static void vt_console_print(struct console *co, const char *b, unsigned count)
2548 {
2549 struct vc_data *vc = vc_cons[fg_console].d;
2550 unsigned char c;
2551 static DEFINE_SPINLOCK(printing_lock);
2552 const ushort *start;
2553 ushort cnt = 0;
2554 ushort myx;
2555 int kmsg_console;
2556
2557 /* console busy or not yet initialized */
2558 if (!printable)
2559 return;
2560 if (!spin_trylock(&printing_lock))
2561 return;
2562
2563 kmsg_console = vt_get_kmsg_redirect();
2564 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2565 vc = vc_cons[kmsg_console - 1].d;
2566
2567 /* read `x' only after setting currcons properly (otherwise
2568 the `x' macro will read the x of the foreground console). */
2569 myx = vc->vc_x;
2570
2571 if (!vc_cons_allocated(fg_console)) {
2572 /* impossible */
2573 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2574 goto quit;
2575 }
2576
2577 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2578 goto quit;
2579
2580 /* undraw cursor first */
2581 if (con_is_fg(vc))
2582 hide_cursor(vc);
2583
2584 start = (ushort *)vc->vc_pos;
2585
2586 /* Contrived structure to try to emulate original need_wrap behaviour
2587 * Problems caused when we have need_wrap set on '\n' character */
2588 while (count--) {
2589 c = *b++;
2590 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2591 if (cnt > 0) {
2592 if (con_is_visible(vc))
2593 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2594 vc->vc_x += cnt;
2595 if (vc->vc_need_wrap)
2596 vc->vc_x--;
2597 cnt = 0;
2598 }
2599 if (c == 8) { /* backspace */
2600 bs(vc);
2601 start = (ushort *)vc->vc_pos;
2602 myx = vc->vc_x;
2603 continue;
2604 }
2605 if (c != 13)
2606 lf(vc);
2607 cr(vc);
2608 start = (ushort *)vc->vc_pos;
2609 myx = vc->vc_x;
2610 if (c == 10 || c == 13)
2611 continue;
2612 }
2613 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2614 notify_write(vc, c);
2615 cnt++;
2616 if (myx == vc->vc_cols - 1) {
2617 vc->vc_need_wrap = 1;
2618 continue;
2619 }
2620 vc->vc_pos += 2;
2621 myx++;
2622 }
2623 if (cnt > 0) {
2624 if (con_is_visible(vc))
2625 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2626 vc->vc_x += cnt;
2627 if (vc->vc_x == vc->vc_cols) {
2628 vc->vc_x--;
2629 vc->vc_need_wrap = 1;
2630 }
2631 }
2632 set_cursor(vc);
2633 notify_update(vc);
2634
2635 quit:
2636 spin_unlock(&printing_lock);
2637 }
2638
2639 static struct tty_driver *vt_console_device(struct console *c, int *index)
2640 {
2641 *index = c->index ? c->index-1 : fg_console;
2642 return console_driver;
2643 }
2644
2645 static struct console vt_console_driver = {
2646 .name = "tty",
2647 .write = vt_console_print,
2648 .device = vt_console_device,
2649 .unblank = unblank_screen,
2650 .flags = CON_PRINTBUFFER,
2651 .index = -1,
2652 };
2653 #endif
2654
2655 /*
2656 * Handling of Linux-specific VC ioctls
2657 */
2658
2659 /*
2660 * Generally a bit racy with respect to console_lock();.
2661 *
2662 * There are some functions which don't need it.
2663 *
2664 * There are some functions which can sleep for arbitrary periods
2665 * (paste_selection) but we don't need the lock there anyway.
2666 *
2667 * set_selection has locking, and definitely needs it
2668 */
2669
2670 int tioclinux(struct tty_struct *tty, unsigned long arg)
2671 {
2672 char type, data;
2673 char __user *p = (char __user *)arg;
2674 int lines;
2675 int ret;
2676
2677 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2678 return -EPERM;
2679 if (get_user(type, p))
2680 return -EFAULT;
2681 ret = 0;
2682
2683 switch (type)
2684 {
2685 case TIOCL_SETSEL:
2686 console_lock();
2687 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2688 console_unlock();
2689 break;
2690 case TIOCL_PASTESEL:
2691 ret = paste_selection(tty);
2692 break;
2693 case TIOCL_UNBLANKSCREEN:
2694 console_lock();
2695 unblank_screen();
2696 console_unlock();
2697 break;
2698 case TIOCL_SELLOADLUT:
2699 console_lock();
2700 ret = sel_loadlut(p);
2701 console_unlock();
2702 break;
2703 case TIOCL_GETSHIFTSTATE:
2704
2705 /*
2706 * Make it possible to react to Shift+Mousebutton.
2707 * Note that 'shift_state' is an undocumented
2708 * kernel-internal variable; programs not closely
2709 * related to the kernel should not use this.
2710 */
2711 data = vt_get_shift_state();
2712 ret = put_user(data, p);
2713 break;
2714 case TIOCL_GETMOUSEREPORTING:
2715 console_lock(); /* May be overkill */
2716 data = mouse_reporting();
2717 console_unlock();
2718 ret = put_user(data, p);
2719 break;
2720 case TIOCL_SETVESABLANK:
2721 console_lock();
2722 ret = set_vesa_blanking(p);
2723 console_unlock();
2724 break;
2725 case TIOCL_GETKMSGREDIRECT:
2726 data = vt_get_kmsg_redirect();
2727 ret = put_user(data, p);
2728 break;
2729 case TIOCL_SETKMSGREDIRECT:
2730 if (!capable(CAP_SYS_ADMIN)) {
2731 ret = -EPERM;
2732 } else {
2733 if (get_user(data, p+1))
2734 ret = -EFAULT;
2735 else
2736 vt_kmsg_redirect(data);
2737 }
2738 break;
2739 case TIOCL_GETFGCONSOLE:
2740 /* No locking needed as this is a transiently
2741 correct return anyway if the caller hasn't
2742 disabled switching */
2743 ret = fg_console;
2744 break;
2745 case TIOCL_SCROLLCONSOLE:
2746 if (get_user(lines, (s32 __user *)(p+4))) {
2747 ret = -EFAULT;
2748 } else {
2749 /* Need the console lock here. Note that lots
2750 of other calls need fixing before the lock
2751 is actually useful ! */
2752 console_lock();
2753 scrollfront(vc_cons[fg_console].d, lines);
2754 console_unlock();
2755 ret = 0;
2756 }
2757 break;
2758 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2759 console_lock();
2760 ignore_poke = 1;
2761 do_blank_screen(0);
2762 console_unlock();
2763 break;
2764 case TIOCL_BLANKEDSCREEN:
2765 ret = console_blanked;
2766 break;
2767 default:
2768 ret = -EINVAL;
2769 break;
2770 }
2771 return ret;
2772 }
2773
2774 /*
2775 * /dev/ttyN handling
2776 */
2777
2778 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2779 {
2780 int retval;
2781
2782 retval = do_con_write(tty, buf, count);
2783 con_flush_chars(tty);
2784
2785 return retval;
2786 }
2787
2788 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2789 {
2790 if (in_interrupt())
2791 return 0; /* n_r3964 calls put_char() from interrupt context */
2792 return do_con_write(tty, &ch, 1);
2793 }
2794
2795 static int con_write_room(struct tty_struct *tty)
2796 {
2797 if (tty->stopped)
2798 return 0;
2799 return 32768; /* No limit, really; we're not buffering */
2800 }
2801
2802 static int con_chars_in_buffer(struct tty_struct *tty)
2803 {
2804 return 0; /* we're not buffering */
2805 }
2806
2807 /*
2808 * con_throttle and con_unthrottle are only used for
2809 * paste_selection(), which has to stuff in a large number of
2810 * characters...
2811 */
2812 static void con_throttle(struct tty_struct *tty)
2813 {
2814 }
2815
2816 static void con_unthrottle(struct tty_struct *tty)
2817 {
2818 struct vc_data *vc = tty->driver_data;
2819
2820 wake_up_interruptible(&vc->paste_wait);
2821 }
2822
2823 /*
2824 * Turn the Scroll-Lock LED on when the tty is stopped
2825 */
2826 static void con_stop(struct tty_struct *tty)
2827 {
2828 int console_num;
2829 if (!tty)
2830 return;
2831 console_num = tty->index;
2832 if (!vc_cons_allocated(console_num))
2833 return;
2834 vt_kbd_con_stop(console_num);
2835 }
2836
2837 /*
2838 * Turn the Scroll-Lock LED off when the console is started
2839 */
2840 static void con_start(struct tty_struct *tty)
2841 {
2842 int console_num;
2843 if (!tty)
2844 return;
2845 console_num = tty->index;
2846 if (!vc_cons_allocated(console_num))
2847 return;
2848 vt_kbd_con_start(console_num);
2849 }
2850
2851 static void con_flush_chars(struct tty_struct *tty)
2852 {
2853 struct vc_data *vc;
2854
2855 if (in_interrupt()) /* from flush_to_ldisc */
2856 return;
2857
2858 /* if we race with con_close(), vt may be null */
2859 console_lock();
2860 vc = tty->driver_data;
2861 if (vc)
2862 set_cursor(vc);
2863 console_unlock();
2864 }
2865
2866 /*
2867 * Allocate the console screen memory.
2868 */
2869 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2870 {
2871 unsigned int currcons = tty->index;
2872 struct vc_data *vc;
2873 int ret;
2874
2875 console_lock();
2876 ret = vc_allocate(currcons);
2877 if (ret)
2878 goto unlock;
2879
2880 vc = vc_cons[currcons].d;
2881
2882 /* Still being freed */
2883 if (vc->port.tty) {
2884 ret = -ERESTARTSYS;
2885 goto unlock;
2886 }
2887
2888 ret = tty_port_install(&vc->port, driver, tty);
2889 if (ret)
2890 goto unlock;
2891
2892 tty->driver_data = vc;
2893 vc->port.tty = tty;
2894
2895 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2896 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2897 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2898 }
2899 if (vc->vc_utf)
2900 tty->termios.c_iflag |= IUTF8;
2901 else
2902 tty->termios.c_iflag &= ~IUTF8;
2903 unlock:
2904 console_unlock();
2905 return ret;
2906 }
2907
2908 static int con_open(struct tty_struct *tty, struct file *filp)
2909 {
2910 /* everything done in install */
2911 return 0;
2912 }
2913
2914
2915 static void con_close(struct tty_struct *tty, struct file *filp)
2916 {
2917 /* Nothing to do - we defer to shutdown */
2918 }
2919
2920 static void con_shutdown(struct tty_struct *tty)
2921 {
2922 struct vc_data *vc = tty->driver_data;
2923 BUG_ON(vc == NULL);
2924 console_lock();
2925 vc->port.tty = NULL;
2926 console_unlock();
2927 }
2928
2929 static int default_color = 7; /* white */
2930 static int default_italic_color = 2; // green (ASCII)
2931 static int default_underline_color = 3; // cyan (ASCII)
2932 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2933 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2934 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2935
2936 static void vc_init(struct vc_data *vc, unsigned int rows,
2937 unsigned int cols, int do_clear)
2938 {
2939 int j, k ;
2940
2941 vc->vc_cols = cols;
2942 vc->vc_rows = rows;
2943 vc->vc_size_row = cols << 1;
2944 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2945
2946 set_origin(vc);
2947 vc->vc_pos = vc->vc_origin;
2948 reset_vc(vc);
2949 for (j=k=0; j<16; j++) {
2950 vc->vc_palette[k++] = default_red[j] ;
2951 vc->vc_palette[k++] = default_grn[j] ;
2952 vc->vc_palette[k++] = default_blu[j] ;
2953 }
2954 vc->vc_def_color = default_color;
2955 vc->vc_ulcolor = default_underline_color;
2956 vc->vc_itcolor = default_italic_color;
2957 vc->vc_halfcolor = 0x08; /* grey */
2958 init_waitqueue_head(&vc->paste_wait);
2959 reset_terminal(vc, do_clear);
2960 }
2961
2962 /*
2963 * This routine initializes console interrupts, and does nothing
2964 * else. If you want the screen to clear, call tty_write with
2965 * the appropriate escape-sequence.
2966 */
2967
2968 static int __init con_init(void)
2969 {
2970 const char *display_desc = NULL;
2971 struct vc_data *vc;
2972 unsigned int currcons = 0, i;
2973
2974 console_lock();
2975
2976 if (conswitchp)
2977 display_desc = conswitchp->con_startup();
2978 if (!display_desc) {
2979 fg_console = 0;
2980 console_unlock();
2981 return 0;
2982 }
2983
2984 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2985 struct con_driver *con_driver = &registered_con_driver[i];
2986
2987 if (con_driver->con == NULL) {
2988 con_driver->con = conswitchp;
2989 con_driver->desc = display_desc;
2990 con_driver->flag = CON_DRIVER_FLAG_INIT;
2991 con_driver->first = 0;
2992 con_driver->last = MAX_NR_CONSOLES - 1;
2993 break;
2994 }
2995 }
2996
2997 for (i = 0; i < MAX_NR_CONSOLES; i++)
2998 con_driver_map[i] = conswitchp;
2999
3000 if (blankinterval) {
3001 blank_state = blank_normal_wait;
3002 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3003 }
3004
3005 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3006 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3007 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3008 tty_port_init(&vc->port);
3009 visual_init(vc, currcons, 1);
3010 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3011 vc_init(vc, vc->vc_rows, vc->vc_cols,
3012 currcons || !vc->vc_sw->con_save_screen);
3013 }
3014 currcons = fg_console = 0;
3015 master_display_fg = vc = vc_cons[currcons].d;
3016 set_origin(vc);
3017 save_screen(vc);
3018 gotoxy(vc, vc->vc_x, vc->vc_y);
3019 csi_J(vc, 0);
3020 update_screen(vc);
3021 pr_info("Console: %s %s %dx%d\n",
3022 vc->vc_can_do_color ? "colour" : "mono",
3023 display_desc, vc->vc_cols, vc->vc_rows);
3024 printable = 1;
3025
3026 console_unlock();
3027
3028 #ifdef CONFIG_VT_CONSOLE
3029 register_console(&vt_console_driver);
3030 #endif
3031 return 0;
3032 }
3033 console_initcall(con_init);
3034
3035 static const struct tty_operations con_ops = {
3036 .install = con_install,
3037 .open = con_open,
3038 .close = con_close,
3039 .write = con_write,
3040 .write_room = con_write_room,
3041 .put_char = con_put_char,
3042 .flush_chars = con_flush_chars,
3043 .chars_in_buffer = con_chars_in_buffer,
3044 .ioctl = vt_ioctl,
3045 #ifdef CONFIG_COMPAT
3046 .compat_ioctl = vt_compat_ioctl,
3047 #endif
3048 .stop = con_stop,
3049 .start = con_start,
3050 .throttle = con_throttle,
3051 .unthrottle = con_unthrottle,
3052 .resize = vt_resize,
3053 .shutdown = con_shutdown
3054 };
3055
3056 static struct cdev vc0_cdev;
3057
3058 static ssize_t show_tty_active(struct device *dev,
3059 struct device_attribute *attr, char *buf)
3060 {
3061 return sprintf(buf, "tty%d\n", fg_console + 1);
3062 }
3063 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3064
3065 static struct attribute *vt_dev_attrs[] = {
3066 &dev_attr_active.attr,
3067 NULL
3068 };
3069
3070 ATTRIBUTE_GROUPS(vt_dev);
3071
3072 int __init vty_init(const struct file_operations *console_fops)
3073 {
3074 cdev_init(&vc0_cdev, console_fops);
3075 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3076 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3077 panic("Couldn't register /dev/tty0 driver\n");
3078 tty0dev = device_create_with_groups(tty_class, NULL,
3079 MKDEV(TTY_MAJOR, 0), NULL,
3080 vt_dev_groups, "tty0");
3081 if (IS_ERR(tty0dev))
3082 tty0dev = NULL;
3083
3084 vcs_init();
3085
3086 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3087 if (!console_driver)
3088 panic("Couldn't allocate console driver\n");
3089
3090 console_driver->name = "tty";
3091 console_driver->name_base = 1;
3092 console_driver->major = TTY_MAJOR;
3093 console_driver->minor_start = 1;
3094 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3095 console_driver->init_termios = tty_std_termios;
3096 if (default_utf8)
3097 console_driver->init_termios.c_iflag |= IUTF8;
3098 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3099 tty_set_operations(console_driver, &con_ops);
3100 if (tty_register_driver(console_driver))
3101 panic("Couldn't register console driver\n");
3102 kbd_init();
3103 console_map_init();
3104 #ifdef CONFIG_MDA_CONSOLE
3105 mda_console_init();
3106 #endif
3107 return 0;
3108 }
3109
3110 #ifndef VT_SINGLE_DRIVER
3111
3112 static struct class *vtconsole_class;
3113
3114 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3115 int deflt)
3116 {
3117 struct module *owner = csw->owner;
3118 const char *desc = NULL;
3119 struct con_driver *con_driver;
3120 int i, j = -1, k = -1, retval = -ENODEV;
3121
3122 if (!try_module_get(owner))
3123 return -ENODEV;
3124
3125 WARN_CONSOLE_UNLOCKED();
3126
3127 /* check if driver is registered */
3128 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3129 con_driver = &registered_con_driver[i];
3130
3131 if (con_driver->con == csw) {
3132 desc = con_driver->desc;
3133 retval = 0;
3134 break;
3135 }
3136 }
3137
3138 if (retval)
3139 goto err;
3140
3141 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3142 csw->con_startup();
3143 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3144 }
3145
3146 if (deflt) {
3147 if (conswitchp)
3148 module_put(conswitchp->owner);
3149
3150 __module_get(owner);
3151 conswitchp = csw;
3152 }
3153
3154 first = max(first, con_driver->first);
3155 last = min(last, con_driver->last);
3156
3157 for (i = first; i <= last; i++) {
3158 int old_was_color;
3159 struct vc_data *vc = vc_cons[i].d;
3160
3161 if (con_driver_map[i])
3162 module_put(con_driver_map[i]->owner);
3163 __module_get(owner);
3164 con_driver_map[i] = csw;
3165
3166 if (!vc || !vc->vc_sw)
3167 continue;
3168
3169 j = i;
3170
3171 if (con_is_visible(vc)) {
3172 k = i;
3173 save_screen(vc);
3174 }
3175
3176 old_was_color = vc->vc_can_do_color;
3177 vc->vc_sw->con_deinit(vc);
3178 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3179 visual_init(vc, i, 0);
3180 set_origin(vc);
3181 update_attr(vc);
3182
3183 /* If the console changed between mono <-> color, then
3184 * the attributes in the screenbuf will be wrong. The
3185 * following resets all attributes to something sane.
3186 */
3187 if (old_was_color != vc->vc_can_do_color)
3188 clear_buffer_attributes(vc);
3189 }
3190
3191 pr_info("Console: switching ");
3192 if (!deflt)
3193 pr_cont("consoles %d-%d ", first + 1, last + 1);
3194 if (j >= 0) {
3195 struct vc_data *vc = vc_cons[j].d;
3196
3197 pr_cont("to %s %s %dx%d\n",
3198 vc->vc_can_do_color ? "colour" : "mono",
3199 desc, vc->vc_cols, vc->vc_rows);
3200
3201 if (k >= 0) {
3202 vc = vc_cons[k].d;
3203 update_screen(vc);
3204 }
3205 } else {
3206 pr_cont("to %s\n", desc);
3207 }
3208
3209 retval = 0;
3210 err:
3211 module_put(owner);
3212 return retval;
3213 };
3214
3215
3216 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3217 /* unlocked version of unbind_con_driver() */
3218 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3219 {
3220 struct module *owner = csw->owner;
3221 const struct consw *defcsw = NULL;
3222 struct con_driver *con_driver = NULL, *con_back = NULL;
3223 int i, retval = -ENODEV;
3224
3225 if (!try_module_get(owner))
3226 return -ENODEV;
3227
3228 WARN_CONSOLE_UNLOCKED();
3229
3230 /* check if driver is registered and if it is unbindable */
3231 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3232 con_driver = &registered_con_driver[i];
3233
3234 if (con_driver->con == csw &&
3235 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3236 retval = 0;
3237 break;
3238 }
3239 }
3240
3241 if (retval)
3242 goto err;
3243
3244 retval = -ENODEV;
3245
3246 /* check if backup driver exists */
3247 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3248 con_back = &registered_con_driver[i];
3249
3250 if (con_back->con && con_back->con != csw) {
3251 defcsw = con_back->con;
3252 retval = 0;
3253 break;
3254 }
3255 }
3256
3257 if (retval)
3258 goto err;
3259
3260 if (!con_is_bound(csw))
3261 goto err;
3262
3263 first = max(first, con_driver->first);
3264 last = min(last, con_driver->last);
3265
3266 for (i = first; i <= last; i++) {
3267 if (con_driver_map[i] == csw) {
3268 module_put(csw->owner);
3269 con_driver_map[i] = NULL;
3270 }
3271 }
3272
3273 if (!con_is_bound(defcsw)) {
3274 const struct consw *defconsw = conswitchp;
3275
3276 defcsw->con_startup();
3277 con_back->flag |= CON_DRIVER_FLAG_INIT;
3278 /*
3279 * vgacon may change the default driver to point
3280 * to dummycon, we restore it here...
3281 */
3282 conswitchp = defconsw;
3283 }
3284
3285 if (!con_is_bound(csw))
3286 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3287
3288 /* ignore return value, binding should not fail */
3289 do_bind_con_driver(defcsw, first, last, deflt);
3290 err:
3291 module_put(owner);
3292 return retval;
3293
3294 }
3295 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3296
3297 static int vt_bind(struct con_driver *con)
3298 {
3299 const struct consw *defcsw = NULL, *csw = NULL;
3300 int i, more = 1, first = -1, last = -1, deflt = 0;
3301
3302 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3303 goto err;
3304
3305 csw = con->con;
3306
3307 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3308 struct con_driver *con = &registered_con_driver[i];
3309
3310 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3311 defcsw = con->con;
3312 break;
3313 }
3314 }
3315
3316 if (!defcsw)
3317 goto err;
3318
3319 while (more) {
3320 more = 0;
3321
3322 for (i = con->first; i <= con->last; i++) {
3323 if (con_driver_map[i] == defcsw) {
3324 if (first == -1)
3325 first = i;
3326 last = i;
3327 more = 1;
3328 } else if (first != -1)
3329 break;
3330 }
3331
3332 if (first == 0 && last == MAX_NR_CONSOLES -1)
3333 deflt = 1;
3334
3335 if (first != -1)
3336 do_bind_con_driver(csw, first, last, deflt);
3337
3338 first = -1;
3339 last = -1;
3340 deflt = 0;
3341 }
3342
3343 err:
3344 return 0;
3345 }
3346
3347 static int vt_unbind(struct con_driver *con)
3348 {
3349 const struct consw *csw = NULL;
3350 int i, more = 1, first = -1, last = -1, deflt = 0;
3351 int ret;
3352
3353 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3354 goto err;
3355
3356 csw = con->con;
3357
3358 while (more) {
3359 more = 0;
3360
3361 for (i = con->first; i <= con->last; i++) {
3362 if (con_driver_map[i] == csw) {
3363 if (first == -1)
3364 first = i;
3365 last = i;
3366 more = 1;
3367 } else if (first != -1)
3368 break;
3369 }
3370
3371 if (first == 0 && last == MAX_NR_CONSOLES -1)
3372 deflt = 1;
3373
3374 if (first != -1) {
3375 ret = do_unbind_con_driver(csw, first, last, deflt);
3376 if (ret != 0)
3377 return ret;
3378 }
3379
3380 first = -1;
3381 last = -1;
3382 deflt = 0;
3383 }
3384
3385 err:
3386 return 0;
3387 }
3388 #else
3389 static inline int vt_bind(struct con_driver *con)
3390 {
3391 return 0;
3392 }
3393 static inline int vt_unbind(struct con_driver *con)
3394 {
3395 return 0;
3396 }
3397 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3398
3399 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3400 const char *buf, size_t count)
3401 {
3402 struct con_driver *con = dev_get_drvdata(dev);
3403 int bind = simple_strtoul(buf, NULL, 0);
3404
3405 console_lock();
3406
3407 if (bind)
3408 vt_bind(con);
3409 else
3410 vt_unbind(con);
3411
3412 console_unlock();
3413
3414 return count;
3415 }
3416
3417 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3418 char *buf)
3419 {
3420 struct con_driver *con = dev_get_drvdata(dev);
3421 int bind = con_is_bound(con->con);
3422
3423 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3424 }
3425
3426 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3427 char *buf)
3428 {
3429 struct con_driver *con = dev_get_drvdata(dev);
3430
3431 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3432 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3433 con->desc);
3434
3435 }
3436
3437 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3438 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3439
3440 static struct attribute *con_dev_attrs[] = {
3441 &dev_attr_bind.attr,
3442 &dev_attr_name.attr,
3443 NULL
3444 };
3445
3446 ATTRIBUTE_GROUPS(con_dev);
3447
3448 static int vtconsole_init_device(struct con_driver *con)
3449 {
3450 con->flag |= CON_DRIVER_FLAG_ATTR;
3451 return 0;
3452 }
3453
3454 static void vtconsole_deinit_device(struct con_driver *con)
3455 {
3456 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3457 }
3458
3459 /**
3460 * con_is_bound - checks if driver is bound to the console
3461 * @csw: console driver
3462 *
3463 * RETURNS: zero if unbound, nonzero if bound
3464 *
3465 * Drivers can call this and if zero, they should release
3466 * all resources allocated on con_startup()
3467 */
3468 int con_is_bound(const struct consw *csw)
3469 {
3470 int i, bound = 0;
3471
3472 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3473 if (con_driver_map[i] == csw) {
3474 bound = 1;
3475 break;
3476 }
3477 }
3478
3479 return bound;
3480 }
3481 EXPORT_SYMBOL(con_is_bound);
3482
3483 /**
3484 * con_debug_enter - prepare the console for the kernel debugger
3485 * @sw: console driver
3486 *
3487 * Called when the console is taken over by the kernel debugger, this
3488 * function needs to save the current console state, then put the console
3489 * into a state suitable for the kernel debugger.
3490 *
3491 * RETURNS:
3492 * Zero on success, nonzero if a failure occurred when trying to prepare
3493 * the console for the debugger.
3494 */
3495 int con_debug_enter(struct vc_data *vc)
3496 {
3497 int ret = 0;
3498
3499 saved_fg_console = fg_console;
3500 saved_last_console = last_console;
3501 saved_want_console = want_console;
3502 saved_vc_mode = vc->vc_mode;
3503 saved_console_blanked = console_blanked;
3504 vc->vc_mode = KD_TEXT;
3505 console_blanked = 0;
3506 if (vc->vc_sw->con_debug_enter)
3507 ret = vc->vc_sw->con_debug_enter(vc);
3508 #ifdef CONFIG_KGDB_KDB
3509 /* Set the initial LINES variable if it is not already set */
3510 if (vc->vc_rows < 999) {
3511 int linecount;
3512 char lns[4];
3513 const char *setargs[3] = {
3514 "set",
3515 "LINES",
3516 lns,
3517 };
3518 if (kdbgetintenv(setargs[0], &linecount)) {
3519 snprintf(lns, 4, "%i", vc->vc_rows);
3520 kdb_set(2, setargs);
3521 }
3522 }
3523 if (vc->vc_cols < 999) {
3524 int colcount;
3525 char cols[4];
3526 const char *setargs[3] = {
3527 "set",
3528 "COLUMNS",
3529 cols,
3530 };
3531 if (kdbgetintenv(setargs[0], &colcount)) {
3532 snprintf(cols, 4, "%i", vc->vc_cols);
3533 kdb_set(2, setargs);
3534 }
3535 }
3536 #endif /* CONFIG_KGDB_KDB */
3537 return ret;
3538 }
3539 EXPORT_SYMBOL_GPL(con_debug_enter);
3540
3541 /**
3542 * con_debug_leave - restore console state
3543 * @sw: console driver
3544 *
3545 * Restore the console state to what it was before the kernel debugger
3546 * was invoked.
3547 *
3548 * RETURNS:
3549 * Zero on success, nonzero if a failure occurred when trying to restore
3550 * the console.
3551 */
3552 int con_debug_leave(void)
3553 {
3554 struct vc_data *vc;
3555 int ret = 0;
3556
3557 fg_console = saved_fg_console;
3558 last_console = saved_last_console;
3559 want_console = saved_want_console;
3560 console_blanked = saved_console_blanked;
3561 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3562
3563 vc = vc_cons[fg_console].d;
3564 if (vc->vc_sw->con_debug_leave)
3565 ret = vc->vc_sw->con_debug_leave(vc);
3566 return ret;
3567 }
3568 EXPORT_SYMBOL_GPL(con_debug_leave);
3569
3570 static int do_register_con_driver(const struct consw *csw, int first, int last)
3571 {
3572 struct module *owner = csw->owner;
3573 struct con_driver *con_driver;
3574 const char *desc;
3575 int i, retval;
3576
3577 WARN_CONSOLE_UNLOCKED();
3578
3579 if (!try_module_get(owner))
3580 return -ENODEV;
3581
3582 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3583 con_driver = &registered_con_driver[i];
3584
3585 /* already registered */
3586 if (con_driver->con == csw) {
3587 retval = -EBUSY;
3588 goto err;
3589 }
3590 }
3591
3592 desc = csw->con_startup();
3593 if (!desc) {
3594 retval = -ENODEV;
3595 goto err;
3596 }
3597
3598 retval = -EINVAL;
3599
3600 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3601 con_driver = &registered_con_driver[i];
3602
3603 if (con_driver->con == NULL &&
3604 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3605 con_driver->con = csw;
3606 con_driver->desc = desc;
3607 con_driver->node = i;
3608 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3609 CON_DRIVER_FLAG_INIT;
3610 con_driver->first = first;
3611 con_driver->last = last;
3612 retval = 0;
3613 break;
3614 }
3615 }
3616
3617 if (retval)
3618 goto err;
3619
3620 con_driver->dev =
3621 device_create_with_groups(vtconsole_class, NULL,
3622 MKDEV(0, con_driver->node),
3623 con_driver, con_dev_groups,
3624 "vtcon%i", con_driver->node);
3625 if (IS_ERR(con_driver->dev)) {
3626 pr_warn("Unable to create device for %s; errno = %ld\n",
3627 con_driver->desc, PTR_ERR(con_driver->dev));
3628 con_driver->dev = NULL;
3629 } else {
3630 vtconsole_init_device(con_driver);
3631 }
3632
3633 err:
3634 module_put(owner);
3635 return retval;
3636 }
3637
3638
3639 /**
3640 * do_unregister_con_driver - unregister console driver from console layer
3641 * @csw: console driver
3642 *
3643 * DESCRIPTION: All drivers that registers to the console layer must
3644 * call this function upon exit, or if the console driver is in a state
3645 * where it won't be able to handle console services, such as the
3646 * framebuffer console without loaded framebuffer drivers.
3647 *
3648 * The driver must unbind first prior to unregistration.
3649 */
3650 int do_unregister_con_driver(const struct consw *csw)
3651 {
3652 int i;
3653
3654 /* cannot unregister a bound driver */
3655 if (con_is_bound(csw))
3656 return -EBUSY;
3657
3658 if (csw == conswitchp)
3659 return -EINVAL;
3660
3661 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3662 struct con_driver *con_driver = &registered_con_driver[i];
3663
3664 if (con_driver->con == csw) {
3665 /*
3666 * Defer the removal of the sysfs entries since that
3667 * will acquire the kernfs s_active lock and we can't
3668 * acquire this lock while holding the console lock:
3669 * the unbind sysfs entry imposes already the opposite
3670 * order. Reset con already here to prevent any later
3671 * lookup to succeed and mark this slot as zombie, so
3672 * it won't get reused until we complete the removal
3673 * in the deferred work.
3674 */
3675 con_driver->con = NULL;
3676 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3677 schedule_work(&con_driver_unregister_work);
3678
3679 return 0;
3680 }
3681 }
3682
3683 return -ENODEV;
3684 }
3685 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3686
3687 static void con_driver_unregister_callback(struct work_struct *ignored)
3688 {
3689 int i;
3690
3691 console_lock();
3692
3693 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3694 struct con_driver *con_driver = &registered_con_driver[i];
3695
3696 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3697 continue;
3698
3699 console_unlock();
3700
3701 vtconsole_deinit_device(con_driver);
3702 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3703
3704 console_lock();
3705
3706 if (WARN_ON_ONCE(con_driver->con))
3707 con_driver->con = NULL;
3708 con_driver->desc = NULL;
3709 con_driver->dev = NULL;
3710 con_driver->node = 0;
3711 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3712 con_driver->flag = 0;
3713 con_driver->first = 0;
3714 con_driver->last = 0;
3715 }
3716
3717 console_unlock();
3718 }
3719
3720 /*
3721 * If we support more console drivers, this function is used
3722 * when a driver wants to take over some existing consoles
3723 * and become default driver for newly opened ones.
3724 *
3725 * do_take_over_console is basically a register followed by unbind
3726 */
3727 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3728 {
3729 int err;
3730
3731 err = do_register_con_driver(csw, first, last);
3732 /*
3733 * If we get an busy error we still want to bind the console driver
3734 * and return success, as we may have unbound the console driver
3735 * but not unregistered it.
3736 */
3737 if (err == -EBUSY)
3738 err = 0;
3739 if (!err)
3740 do_bind_con_driver(csw, first, last, deflt);
3741
3742 return err;
3743 }
3744 EXPORT_SYMBOL_GPL(do_take_over_console);
3745
3746
3747 /*
3748 * give_up_console is a wrapper to unregister_con_driver. It will only
3749 * work if driver is fully unbound.
3750 */
3751 void give_up_console(const struct consw *csw)
3752 {
3753 console_lock();
3754 do_unregister_con_driver(csw);
3755 console_unlock();
3756 }
3757
3758 static int __init vtconsole_class_init(void)
3759 {
3760 int i;
3761
3762 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3763 if (IS_ERR(vtconsole_class)) {
3764 pr_warn("Unable to create vt console class; errno = %ld\n",
3765 PTR_ERR(vtconsole_class));
3766 vtconsole_class = NULL;
3767 }
3768
3769 /* Add system drivers to sysfs */
3770 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3771 struct con_driver *con = &registered_con_driver[i];
3772
3773 if (con->con && !con->dev) {
3774 con->dev =
3775 device_create_with_groups(vtconsole_class, NULL,
3776 MKDEV(0, con->node),
3777 con, con_dev_groups,
3778 "vtcon%i", con->node);
3779
3780 if (IS_ERR(con->dev)) {
3781 pr_warn("Unable to create device for %s; errno = %ld\n",
3782 con->desc, PTR_ERR(con->dev));
3783 con->dev = NULL;
3784 } else {
3785 vtconsole_init_device(con);
3786 }
3787 }
3788 }
3789
3790 return 0;
3791 }
3792 postcore_initcall(vtconsole_class_init);
3793
3794 #endif
3795
3796 /*
3797 * Screen blanking
3798 */
3799
3800 static int set_vesa_blanking(char __user *p)
3801 {
3802 unsigned int mode;
3803
3804 if (get_user(mode, p + 1))
3805 return -EFAULT;
3806
3807 vesa_blank_mode = (mode < 4) ? mode : 0;
3808 return 0;
3809 }
3810
3811 void do_blank_screen(int entering_gfx)
3812 {
3813 struct vc_data *vc = vc_cons[fg_console].d;
3814 int i;
3815
3816 WARN_CONSOLE_UNLOCKED();
3817
3818 if (console_blanked) {
3819 if (blank_state == blank_vesa_wait) {
3820 blank_state = blank_off;
3821 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3822 }
3823 return;
3824 }
3825
3826 /* entering graphics mode? */
3827 if (entering_gfx) {
3828 hide_cursor(vc);
3829 save_screen(vc);
3830 vc->vc_sw->con_blank(vc, -1, 1);
3831 console_blanked = fg_console + 1;
3832 blank_state = blank_off;
3833 set_origin(vc);
3834 return;
3835 }
3836
3837 if (blank_state != blank_normal_wait)
3838 return;
3839 blank_state = blank_off;
3840
3841 /* don't blank graphics */
3842 if (vc->vc_mode != KD_TEXT) {
3843 console_blanked = fg_console + 1;
3844 return;
3845 }
3846
3847 hide_cursor(vc);
3848 del_timer_sync(&console_timer);
3849 blank_timer_expired = 0;
3850
3851 save_screen(vc);
3852 /* In case we need to reset origin, blanking hook returns 1 */
3853 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3854 console_blanked = fg_console + 1;
3855 if (i)
3856 set_origin(vc);
3857
3858 if (console_blank_hook && console_blank_hook(1))
3859 return;
3860
3861 if (vesa_off_interval && vesa_blank_mode) {
3862 blank_state = blank_vesa_wait;
3863 mod_timer(&console_timer, jiffies + vesa_off_interval);
3864 }
3865 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3866 }
3867 EXPORT_SYMBOL(do_blank_screen);
3868
3869 /*
3870 * Called by timer as well as from vt_console_driver
3871 */
3872 void do_unblank_screen(int leaving_gfx)
3873 {
3874 struct vc_data *vc;
3875
3876 /* This should now always be called from a "sane" (read: can schedule)
3877 * context for the sake of the low level drivers, except in the special
3878 * case of oops_in_progress
3879 */
3880 if (!oops_in_progress)
3881 might_sleep();
3882
3883 WARN_CONSOLE_UNLOCKED();
3884
3885 ignore_poke = 0;
3886 if (!console_blanked)
3887 return;
3888 if (!vc_cons_allocated(fg_console)) {
3889 /* impossible */
3890 pr_warn("unblank_screen: tty %d not allocated ??\n",
3891 fg_console + 1);
3892 return;
3893 }
3894 vc = vc_cons[fg_console].d;
3895 /* Try to unblank in oops case too */
3896 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3897 return; /* but leave console_blanked != 0 */
3898
3899 if (blankinterval) {
3900 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3901 blank_state = blank_normal_wait;
3902 }
3903
3904 console_blanked = 0;
3905 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3906 /* Low-level driver cannot restore -> do it ourselves */
3907 update_screen(vc);
3908 if (console_blank_hook)
3909 console_blank_hook(0);
3910 set_palette(vc);
3911 set_cursor(vc);
3912 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3913 }
3914 EXPORT_SYMBOL(do_unblank_screen);
3915
3916 /*
3917 * This is called by the outside world to cause a forced unblank, mostly for
3918 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3919 * call it with 1 as an argument and so force a mode restore... that may kill
3920 * X or at least garbage the screen but would also make the Oops visible...
3921 */
3922 void unblank_screen(void)
3923 {
3924 do_unblank_screen(0);
3925 }
3926
3927 /*
3928 * We defer the timer blanking to work queue so it can take the console mutex
3929 * (console operations can still happen at irq time, but only from printk which
3930 * has the console mutex. Not perfect yet, but better than no locking
3931 */
3932 static void blank_screen_t(unsigned long dummy)
3933 {
3934 blank_timer_expired = 1;
3935 schedule_work(&console_work);
3936 }
3937
3938 void poke_blanked_console(void)
3939 {
3940 WARN_CONSOLE_UNLOCKED();
3941
3942 /* Add this so we quickly catch whoever might call us in a non
3943 * safe context. Nowadays, unblank_screen() isn't to be called in
3944 * atomic contexts and is allowed to schedule (with the special case
3945 * of oops_in_progress, but that isn't of any concern for this
3946 * function. --BenH.
3947 */
3948 might_sleep();
3949
3950 /* This isn't perfectly race free, but a race here would be mostly harmless,
3951 * at worse, we'll do a spurrious blank and it's unlikely
3952 */
3953 del_timer(&console_timer);
3954 blank_timer_expired = 0;
3955
3956 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3957 return;
3958 if (console_blanked)
3959 unblank_screen();
3960 else if (blankinterval) {
3961 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3962 blank_state = blank_normal_wait;
3963 }
3964 }
3965
3966 /*
3967 * Palettes
3968 */
3969
3970 static void set_palette(struct vc_data *vc)
3971 {
3972 WARN_CONSOLE_UNLOCKED();
3973
3974 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3975 vc->vc_sw->con_set_palette(vc, color_table);
3976 }
3977
3978 /*
3979 * Load palette into the DAC registers. arg points to a colour
3980 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3981 */
3982
3983 int con_set_cmap(unsigned char __user *arg)
3984 {
3985 int i, j, k;
3986 unsigned char colormap[3*16];
3987
3988 if (copy_from_user(colormap, arg, sizeof(colormap)))
3989 return -EFAULT;
3990
3991 console_lock();
3992 for (i = k = 0; i < 16; i++) {
3993 default_red[i] = colormap[k++];
3994 default_grn[i] = colormap[k++];
3995 default_blu[i] = colormap[k++];
3996 }
3997 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3998 if (!vc_cons_allocated(i))
3999 continue;
4000 for (j = k = 0; j < 16; j++) {
4001 vc_cons[i].d->vc_palette[k++] = default_red[j];
4002 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4003 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4004 }
4005 set_palette(vc_cons[i].d);
4006 }
4007 console_unlock();
4008
4009 return 0;
4010 }
4011
4012 int con_get_cmap(unsigned char __user *arg)
4013 {
4014 int i, k;
4015 unsigned char colormap[3*16];
4016
4017 console_lock();
4018 for (i = k = 0; i < 16; i++) {
4019 colormap[k++] = default_red[i];
4020 colormap[k++] = default_grn[i];
4021 colormap[k++] = default_blu[i];
4022 }
4023 console_unlock();
4024
4025 if (copy_to_user(arg, colormap, sizeof(colormap)))
4026 return -EFAULT;
4027
4028 return 0;
4029 }
4030
4031 void reset_palette(struct vc_data *vc)
4032 {
4033 int j, k;
4034 for (j=k=0; j<16; j++) {
4035 vc->vc_palette[k++] = default_red[j];
4036 vc->vc_palette[k++] = default_grn[j];
4037 vc->vc_palette[k++] = default_blu[j];
4038 }
4039 set_palette(vc);
4040 }
4041
4042 /*
4043 * Font switching
4044 *
4045 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4046 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4047 * depending on width) reserved for each character which is kinda wasty, but
4048 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4049 * is up to the actual low-level console-driver convert data into its favorite
4050 * format (maybe we should add a `fontoffset' field to the `display'
4051 * structure so we won't have to convert the fontdata all the time.
4052 * /Jes
4053 */
4054
4055 #define max_font_size 65536
4056
4057 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4058 {
4059 struct console_font font;
4060 int rc = -EINVAL;
4061 int c;
4062
4063 if (op->data) {
4064 font.data = kmalloc(max_font_size, GFP_KERNEL);
4065 if (!font.data)
4066 return -ENOMEM;
4067 } else
4068 font.data = NULL;
4069
4070 console_lock();
4071 if (vc->vc_mode != KD_TEXT)
4072 rc = -EINVAL;
4073 else if (vc->vc_sw->con_font_get)
4074 rc = vc->vc_sw->con_font_get(vc, &font);
4075 else
4076 rc = -ENOSYS;
4077 console_unlock();
4078
4079 if (rc)
4080 goto out;
4081
4082 c = (font.width+7)/8 * 32 * font.charcount;
4083
4084 if (op->data && font.charcount > op->charcount)
4085 rc = -ENOSPC;
4086 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4087 if (font.width > op->width || font.height > op->height)
4088 rc = -ENOSPC;
4089 } else {
4090 if (font.width != 8)
4091 rc = -EIO;
4092 else if ((op->height && font.height > op->height) ||
4093 font.height > 32)
4094 rc = -ENOSPC;
4095 }
4096 if (rc)
4097 goto out;
4098
4099 op->height = font.height;
4100 op->width = font.width;
4101 op->charcount = font.charcount;
4102
4103 if (op->data && copy_to_user(op->data, font.data, c))
4104 rc = -EFAULT;
4105
4106 out:
4107 kfree(font.data);
4108 return rc;
4109 }
4110
4111 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4112 {
4113 struct console_font font;
4114 int rc = -EINVAL;
4115 int size;
4116
4117 if (vc->vc_mode != KD_TEXT)
4118 return -EINVAL;
4119 if (!op->data)
4120 return -EINVAL;
4121 if (op->charcount > 512)
4122 return -EINVAL;
4123 if (op->width <= 0 || op->width > 32 || op->height > 32)
4124 return -EINVAL;
4125 size = (op->width+7)/8 * 32 * op->charcount;
4126 if (size > max_font_size)
4127 return -ENOSPC;
4128
4129 font.data = memdup_user(op->data, size);
4130 if (IS_ERR(font.data))
4131 return PTR_ERR(font.data);
4132
4133 if (!op->height) { /* Need to guess font height [compat] */
4134 int h, i;
4135 u8 *charmap = font.data;
4136
4137 /*
4138 * If from KDFONTOP ioctl, don't allow things which can be done
4139 * in userland,so that we can get rid of this soon
4140 */
4141 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4142 kfree(font.data);
4143 return -EINVAL;
4144 }
4145
4146 for (h = 32; h > 0; h--)
4147 for (i = 0; i < op->charcount; i++)
4148 if (charmap[32*i+h-1])
4149 goto nonzero;
4150
4151 kfree(font.data);
4152 return -EINVAL;
4153
4154 nonzero:
4155 op->height = h;
4156 }
4157
4158 font.charcount = op->charcount;
4159 font.width = op->width;
4160 font.height = op->height;
4161
4162 console_lock();
4163 if (vc->vc_mode != KD_TEXT)
4164 rc = -EINVAL;
4165 else if (vc->vc_sw->con_font_set)
4166 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4167 else
4168 rc = -ENOSYS;
4169 console_unlock();
4170 kfree(font.data);
4171 return rc;
4172 }
4173
4174 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4175 {
4176 struct console_font font = {.width = op->width, .height = op->height};
4177 char name[MAX_FONT_NAME];
4178 char *s = name;
4179 int rc;
4180
4181
4182 if (!op->data)
4183 s = NULL;
4184 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4185 return -EFAULT;
4186 else
4187 name[MAX_FONT_NAME - 1] = 0;
4188
4189 console_lock();
4190 if (vc->vc_mode != KD_TEXT) {
4191 console_unlock();
4192 return -EINVAL;
4193 }
4194 if (vc->vc_sw->con_font_default)
4195 rc = vc->vc_sw->con_font_default(vc, &font, s);
4196 else
4197 rc = -ENOSYS;
4198 console_unlock();
4199 if (!rc) {
4200 op->width = font.width;
4201 op->height = font.height;
4202 }
4203 return rc;
4204 }
4205
4206 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4207 {
4208 int con = op->height;
4209 int rc;
4210
4211
4212 console_lock();
4213 if (vc->vc_mode != KD_TEXT)
4214 rc = -EINVAL;
4215 else if (!vc->vc_sw->con_font_copy)
4216 rc = -ENOSYS;
4217 else if (con < 0 || !vc_cons_allocated(con))
4218 rc = -ENOTTY;
4219 else if (con == vc->vc_num) /* nothing to do */
4220 rc = 0;
4221 else
4222 rc = vc->vc_sw->con_font_copy(vc, con);
4223 console_unlock();
4224 return rc;
4225 }
4226
4227 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4228 {
4229 switch (op->op) {
4230 case KD_FONT_OP_SET:
4231 return con_font_set(vc, op);
4232 case KD_FONT_OP_GET:
4233 return con_font_get(vc, op);
4234 case KD_FONT_OP_SET_DEFAULT:
4235 return con_font_default(vc, op);
4236 case KD_FONT_OP_COPY:
4237 return con_font_copy(vc, op);
4238 }
4239 return -ENOSYS;
4240 }
4241
4242 /*
4243 * Interface exported to selection and vcs.
4244 */
4245
4246 /* used by selection */
4247 u16 screen_glyph(struct vc_data *vc, int offset)
4248 {
4249 u16 w = scr_readw(screenpos(vc, offset, 1));
4250 u16 c = w & 0xff;
4251
4252 if (w & vc->vc_hi_font_mask)
4253 c |= 0x100;
4254 return c;
4255 }
4256 EXPORT_SYMBOL_GPL(screen_glyph);
4257
4258 /* used by vcs - note the word offset */
4259 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4260 {
4261 return screenpos(vc, 2 * w_offset, viewed);
4262 }
4263 EXPORT_SYMBOL_GPL(screen_pos);
4264
4265 void getconsxy(struct vc_data *vc, unsigned char *p)
4266 {
4267 p[0] = vc->vc_x;
4268 p[1] = vc->vc_y;
4269 }
4270
4271 void putconsxy(struct vc_data *vc, unsigned char *p)
4272 {
4273 hide_cursor(vc);
4274 gotoxy(vc, p[0], p[1]);
4275 set_cursor(vc);
4276 }
4277
4278 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4279 {
4280 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4281 return softcursor_original;
4282 return scr_readw(org);
4283 }
4284
4285 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4286 {
4287 scr_writew(val, org);
4288 if ((unsigned long)org == vc->vc_pos) {
4289 softcursor_original = -1;
4290 add_softcursor(vc);
4291 }
4292 }
4293
4294 void vcs_scr_updated(struct vc_data *vc)
4295 {
4296 notify_update(vc);
4297 }
4298
4299 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4300 unsigned int rolled_over, void *base, unsigned int size)
4301 {
4302 unsigned long ubase = (unsigned long)base;
4303 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4304 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4305 ptrdiff_t origin = (void *)c->vc_origin - base;
4306 int margin = c->vc_size_row * 4;
4307 int from, wrap, from_off, avail;
4308
4309 /* Turn scrollback off */
4310 if (!lines) {
4311 c->vc_visible_origin = c->vc_origin;
4312 return;
4313 }
4314
4315 /* Do we have already enough to allow jumping from 0 to the end? */
4316 if (rolled_over > scr_end + margin) {
4317 from = scr_end;
4318 wrap = rolled_over + c->vc_size_row;
4319 } else {
4320 from = 0;
4321 wrap = size;
4322 }
4323
4324 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4325 avail = (origin - from + wrap) % wrap;
4326
4327 /* Only a little piece would be left? Show all incl. the piece! */
4328 if (avail < 2 * margin)
4329 margin = 0;
4330 if (from_off < margin)
4331 from_off = 0;
4332 if (from_off > avail - margin)
4333 from_off = avail;
4334
4335 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4336 }
4337 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4338
4339 /*
4340 * Visible symbols for modules
4341 */
4342
4343 EXPORT_SYMBOL(color_table);
4344 EXPORT_SYMBOL(default_red);
4345 EXPORT_SYMBOL(default_grn);
4346 EXPORT_SYMBOL(default_blu);
4347 EXPORT_SYMBOL(update_region);
4348 EXPORT_SYMBOL(redraw_screen);
4349 EXPORT_SYMBOL(vc_resize);
4350 EXPORT_SYMBOL(fg_console);
4351 EXPORT_SYMBOL(console_blank_hook);
4352 EXPORT_SYMBOL(console_blanked);
4353 EXPORT_SYMBOL(vc_cons);
4354 EXPORT_SYMBOL(global_cursor_default);
4355 #ifndef VT_SINGLE_DRIVER
4356 EXPORT_SYMBOL(give_up_console);
4357 #endif
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