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[mirror_ubuntu-zesty-kernel.git] / drivers / tty / vt / vt.c
1 /*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 */
4
5 /*
6 * Hopefully this will be a rather complete VT102 implementation.
7 *
8 * Beeping thanks to John T Kohl.
9 *
10 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
11 * Chars, and VT100 enhancements by Peter MacDonald.
12 *
13 * Copy and paste function by Andrew Haylett,
14 * some enhancements by Alessandro Rubini.
15 *
16 * Code to check for different video-cards mostly by Galen Hunt,
17 * <g-hunt@ee.utah.edu>
18 *
19 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
20 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
21 *
22 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
23 * Resizing of consoles, aeb, 940926
24 *
25 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
26 * <poe@daimi.aau.dk>
27 *
28 * User-defined bell sound, new setterm control sequences and printk
29 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
30 *
31 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
32 *
33 * Merge with the abstract console driver by Geert Uytterhoeven
34 * <geert@linux-m68k.org>, Jan 1997.
35 *
36 * Original m68k console driver modifications by
37 *
38 * - Arno Griffioen <arno@usn.nl>
39 * - David Carter <carter@cs.bris.ac.uk>
40 *
41 * The abstract console driver provides a generic interface for a text
42 * console. It supports VGA text mode, frame buffer based graphical consoles
43 * and special graphics processors that are only accessible through some
44 * registers (e.g. a TMS340x0 GSP).
45 *
46 * The interface to the hardware is specified using a special structure
47 * (struct consw) which contains function pointers to console operations
48 * (see <linux/console.h> for more information).
49 *
50 * Support for changeable cursor shape
51 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
52 *
53 * Ported to i386 and con_scrolldelta fixed
54 * by Emmanuel Marty <core@ggi-project.org>, April 1998
55 *
56 * Resurrected character buffers in videoram plus lots of other trickery
57 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
58 *
59 * Removed old-style timers, introduced console_timer, made timer
60 * deletion SMP-safe. 17Jun00, Andrew Morton
61 *
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
64 *
65 * Fixed UTF-8 mode so alternate charset modes always work according
66 * to control sequences interpreted in do_con_trol function
67 * preserving backward VT100 semigraphics compatibility,
68 * malformed UTF sequences represented as sequences of replacement glyphs,
69 * original codes or '?' as a last resort if replacement glyph is undefined
70 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
71 */
72
73 #include <linux/module.h>
74 #include <linux/types.h>
75 #include <linux/sched.h>
76 #include <linux/tty.h>
77 #include <linux/tty_flip.h>
78 #include <linux/kernel.h>
79 #include <linux/string.h>
80 #include <linux/errno.h>
81 #include <linux/kd.h>
82 #include <linux/slab.h>
83 #include <linux/major.h>
84 #include <linux/mm.h>
85 #include <linux/console.h>
86 #include <linux/init.h>
87 #include <linux/mutex.h>
88 #include <linux/vt_kern.h>
89 #include <linux/selection.h>
90 #include <linux/tiocl.h>
91 #include <linux/kbd_kern.h>
92 #include <linux/consolemap.h>
93 #include <linux/timer.h>
94 #include <linux/interrupt.h>
95 #include <linux/workqueue.h>
96 #include <linux/pm.h>
97 #include <linux/font.h>
98 #include <linux/bitops.h>
99 #include <linux/notifier.h>
100 #include <linux/device.h>
101 #include <linux/io.h>
102 #include <linux/uaccess.h>
103 #include <linux/kdb.h>
104 #include <linux/ctype.h>
105 #include <linux/screen_info.h>
106
107 #define MAX_NR_CON_DRIVER 16
108
109 #define CON_DRIVER_FLAG_MODULE 1
110 #define CON_DRIVER_FLAG_INIT 2
111 #define CON_DRIVER_FLAG_ATTR 4
112 #define CON_DRIVER_FLAG_ZOMBIE 8
113
114 struct con_driver {
115 const struct consw *con;
116 const char *desc;
117 struct device *dev;
118 int node;
119 int first;
120 int last;
121 int flag;
122 };
123
124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
125 const struct consw *conswitchp;
126
127 /* A bitmap for codes <32. A bit of 1 indicates that the code
128 * corresponding to that bit number invokes some special action
129 * (such as cursor movement) and should not be displayed as a
130 * glyph unless the disp_ctrl mode is explicitly enabled.
131 */
132 #define CTRL_ACTION 0x0d00ff81
133 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
134
135 /*
136 * Here is the default bell parameters: 750HZ, 1/8th of a second
137 */
138 #define DEFAULT_BELL_PITCH 750
139 #define DEFAULT_BELL_DURATION (HZ/8)
140 #define DEFAULT_CURSOR_BLINK_MS 200
141
142 struct vc vc_cons [MAX_NR_CONSOLES];
143
144 #ifndef VT_SINGLE_DRIVER
145 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
146 #endif
147
148 static int con_open(struct tty_struct *, struct file *);
149 static void vc_init(struct vc_data *vc, unsigned int rows,
150 unsigned int cols, int do_clear, int mode);
151 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
152 static void save_cur(struct vc_data *vc);
153 static void reset_terminal(struct vc_data *vc, int do_clear);
154 static void con_flush_chars(struct tty_struct *tty);
155 static int set_vesa_blanking(char __user *p);
156 static void set_cursor(struct vc_data *vc);
157 static void hide_cursor(struct vc_data *vc);
158 static void console_callback(struct work_struct *ignored);
159 static void con_driver_unregister_callback(struct work_struct *ignored);
160 static void blank_screen_t(unsigned long dummy);
161 static void set_palette(struct vc_data *vc);
162
163 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
164
165 static int printable; /* Is console ready for printing? */
166 int default_utf8 = true;
167 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
168 int global_cursor_default = -1;
169 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
170
171 static int cur_default = CUR_DEFAULT;
172 module_param(cur_default, int, S_IRUGO | S_IWUSR);
173
174 int vt_handoff = 0;
175 module_param_named(handoff, vt_handoff, int, S_IRUGO | S_IWUSR);
176
177 /*
178 * ignore_poke: don't unblank the screen when things are typed. This is
179 * mainly for the privacy of braille terminal users.
180 */
181 static int ignore_poke;
182
183 int do_poke_blanked_console;
184 int console_blanked;
185
186 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
187 static int vesa_off_interval;
188 static int blankinterval;
189 core_param(consoleblank, blankinterval, int, 0444);
190
191 static DECLARE_WORK(console_work, console_callback);
192 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
193
194 /*
195 * fg_console is the current virtual console,
196 * last_console is the last used one,
197 * want_console is the console we want to switch to,
198 * saved_* variants are for save/restore around kernel debugger enter/leave
199 */
200 int fg_console;
201 int last_console;
202 int want_console = -1;
203 static int saved_fg_console;
204 static int saved_last_console;
205 static int saved_want_console;
206 static int saved_vc_mode;
207 static int saved_console_blanked;
208
209 /*
210 * For each existing display, we have a pointer to console currently visible
211 * on that display, allowing consoles other than fg_console to be refreshed
212 * appropriately. Unless the low-level driver supplies its own display_fg
213 * variable, we use this one for the "master display".
214 */
215 static struct vc_data *master_display_fg;
216
217 /*
218 * Unfortunately, we need to delay tty echo when we're currently writing to the
219 * console since the code is (and always was) not re-entrant, so we schedule
220 * all flip requests to process context with schedule-task() and run it from
221 * console_callback().
222 */
223
224 /*
225 * For the same reason, we defer scrollback to the console callback.
226 */
227 static int scrollback_delta;
228
229 /*
230 * Hook so that the power management routines can (un)blank
231 * the console on our behalf.
232 */
233 int (*console_blank_hook)(int);
234
235 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
236 static int blank_state;
237 static int blank_timer_expired;
238 enum {
239 blank_off = 0,
240 blank_normal_wait,
241 blank_vesa_wait,
242 };
243
244 /*
245 * /sys/class/tty/tty0/
246 *
247 * the attribute 'active' contains the name of the current vc
248 * console and it supports poll() to detect vc switches
249 */
250 static struct device *tty0dev;
251
252 /*
253 * Notifier list for console events.
254 */
255 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
256
257 int register_vt_notifier(struct notifier_block *nb)
258 {
259 return atomic_notifier_chain_register(&vt_notifier_list, nb);
260 }
261 EXPORT_SYMBOL_GPL(register_vt_notifier);
262
263 int unregister_vt_notifier(struct notifier_block *nb)
264 {
265 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
266 }
267 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
268
269 static void notify_write(struct vc_data *vc, unsigned int unicode)
270 {
271 struct vt_notifier_param param = { .vc = vc, .c = unicode };
272 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
273 }
274
275 static void notify_update(struct vc_data *vc)
276 {
277 struct vt_notifier_param param = { .vc = vc };
278 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
279 }
280 /*
281 * Low-Level Functions
282 */
283
284 static inline bool con_is_fg(const struct vc_data *vc)
285 {
286 return vc->vc_num == fg_console;
287 }
288
289 static inline bool con_should_update(const struct vc_data *vc)
290 {
291 return con_is_visible(vc) && !console_blanked;
292 }
293
294 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
295 {
296 unsigned short *p;
297
298 if (!viewed)
299 p = (unsigned short *)(vc->vc_origin + offset);
300 else if (!vc->vc_sw->con_screen_pos)
301 p = (unsigned short *)(vc->vc_visible_origin + offset);
302 else
303 p = vc->vc_sw->con_screen_pos(vc, offset);
304 return p;
305 }
306
307 /* Called from the keyboard irq path.. */
308 static inline void scrolldelta(int lines)
309 {
310 /* FIXME */
311 /* scrolldelta needs some kind of consistency lock, but the BKL was
312 and still is not protecting versus the scheduled back end */
313 scrollback_delta += lines;
314 schedule_console_callback();
315 }
316
317 void schedule_console_callback(void)
318 {
319 schedule_work(&console_work);
320 }
321
322 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
323 enum con_scroll dir, unsigned int nr)
324 {
325 u16 *clear, *d, *s;
326
327 if (t + nr >= b)
328 nr = b - t - 1;
329 if (b > vc->vc_rows || t >= b || nr < 1)
330 return;
331 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
332 return;
333
334 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
335 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
336
337 if (dir == SM_UP) {
338 clear = s + (b - t - nr) * vc->vc_cols;
339 swap(s, d);
340 }
341 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
342 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
343 }
344
345 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
346 {
347 unsigned int xx, yy, offset;
348 u16 *p;
349
350 p = (u16 *) start;
351 if (!vc->vc_sw->con_getxy) {
352 offset = (start - vc->vc_origin) / 2;
353 xx = offset % vc->vc_cols;
354 yy = offset / vc->vc_cols;
355 } else {
356 int nxx, nyy;
357 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
358 xx = nxx; yy = nyy;
359 }
360 for(;;) {
361 u16 attrib = scr_readw(p) & 0xff00;
362 int startx = xx;
363 u16 *q = p;
364 while (xx < vc->vc_cols && count) {
365 if (attrib != (scr_readw(p) & 0xff00)) {
366 if (p > q)
367 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
368 startx = xx;
369 q = p;
370 attrib = scr_readw(p) & 0xff00;
371 }
372 p++;
373 xx++;
374 count--;
375 }
376 if (p > q)
377 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
378 if (!count)
379 break;
380 xx = 0;
381 yy++;
382 if (vc->vc_sw->con_getxy) {
383 p = (u16 *)start;
384 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
385 }
386 }
387 }
388
389 void update_region(struct vc_data *vc, unsigned long start, int count)
390 {
391 WARN_CONSOLE_UNLOCKED();
392
393 if (con_should_update(vc)) {
394 hide_cursor(vc);
395 do_update_region(vc, start, count);
396 set_cursor(vc);
397 }
398 }
399
400 /* Structure of attributes is hardware-dependent */
401
402 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
403 u8 _underline, u8 _reverse, u8 _italic)
404 {
405 if (vc->vc_sw->con_build_attr)
406 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
407 _blink, _underline, _reverse, _italic);
408
409 /*
410 * ++roman: I completely changed the attribute format for monochrome
411 * mode (!can_do_color). The formerly used MDA (monochrome display
412 * adapter) format didn't allow the combination of certain effects.
413 * Now the attribute is just a bit vector:
414 * Bit 0..1: intensity (0..2)
415 * Bit 2 : underline
416 * Bit 3 : reverse
417 * Bit 7 : blink
418 */
419 {
420 u8 a = _color;
421 if (!vc->vc_can_do_color)
422 return _intensity |
423 (_italic ? 2 : 0) |
424 (_underline ? 4 : 0) |
425 (_reverse ? 8 : 0) |
426 (_blink ? 0x80 : 0);
427 if (_italic)
428 a = (a & 0xF0) | vc->vc_itcolor;
429 else if (_underline)
430 a = (a & 0xf0) | vc->vc_ulcolor;
431 else if (_intensity == 0)
432 a = (a & 0xf0) | vc->vc_ulcolor;
433 if (_reverse)
434 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
435 if (_blink)
436 a ^= 0x80;
437 if (_intensity == 2)
438 a ^= 0x08;
439 if (vc->vc_hi_font_mask == 0x100)
440 a <<= 1;
441 return a;
442 }
443 }
444
445 static void update_attr(struct vc_data *vc)
446 {
447 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
448 vc->vc_blink, vc->vc_underline,
449 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
450 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
451 }
452
453 /* Note: inverting the screen twice should revert to the original state */
454 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
455 {
456 unsigned short *p;
457
458 WARN_CONSOLE_UNLOCKED();
459
460 count /= 2;
461 p = screenpos(vc, offset, viewed);
462 if (vc->vc_sw->con_invert_region) {
463 vc->vc_sw->con_invert_region(vc, p, count);
464 } else {
465 u16 *q = p;
466 int cnt = count;
467 u16 a;
468
469 if (!vc->vc_can_do_color) {
470 while (cnt--) {
471 a = scr_readw(q);
472 a ^= 0x0800;
473 scr_writew(a, q);
474 q++;
475 }
476 } else if (vc->vc_hi_font_mask == 0x100) {
477 while (cnt--) {
478 a = scr_readw(q);
479 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
480 scr_writew(a, q);
481 q++;
482 }
483 } else {
484 while (cnt--) {
485 a = scr_readw(q);
486 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
487 scr_writew(a, q);
488 q++;
489 }
490 }
491 }
492
493 if (con_should_update(vc))
494 do_update_region(vc, (unsigned long) p, count);
495 notify_update(vc);
496 }
497
498 /* used by selection: complement pointer position */
499 void complement_pos(struct vc_data *vc, int offset)
500 {
501 static int old_offset = -1;
502 static unsigned short old;
503 static unsigned short oldx, oldy;
504
505 WARN_CONSOLE_UNLOCKED();
506
507 if (old_offset != -1 && old_offset >= 0 &&
508 old_offset < vc->vc_screenbuf_size) {
509 scr_writew(old, screenpos(vc, old_offset, 1));
510 if (con_should_update(vc))
511 vc->vc_sw->con_putc(vc, old, oldy, oldx);
512 notify_update(vc);
513 }
514
515 old_offset = offset;
516
517 if (offset != -1 && offset >= 0 &&
518 offset < vc->vc_screenbuf_size) {
519 unsigned short new;
520 unsigned short *p;
521 p = screenpos(vc, offset, 1);
522 old = scr_readw(p);
523 new = old ^ vc->vc_complement_mask;
524 scr_writew(new, p);
525 if (con_should_update(vc)) {
526 oldx = (offset >> 1) % vc->vc_cols;
527 oldy = (offset >> 1) / vc->vc_cols;
528 vc->vc_sw->con_putc(vc, new, oldy, oldx);
529 }
530 notify_update(vc);
531 }
532 }
533
534 static void insert_char(struct vc_data *vc, unsigned int nr)
535 {
536 unsigned short *p = (unsigned short *) vc->vc_pos;
537
538 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
539 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
540 vc->vc_need_wrap = 0;
541 if (con_should_update(vc))
542 do_update_region(vc, (unsigned long) p,
543 vc->vc_cols - vc->vc_x);
544 }
545
546 static void delete_char(struct vc_data *vc, unsigned int nr)
547 {
548 unsigned short *p = (unsigned short *) vc->vc_pos;
549
550 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
551 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
552 nr * 2);
553 vc->vc_need_wrap = 0;
554 if (con_should_update(vc))
555 do_update_region(vc, (unsigned long) p,
556 vc->vc_cols - vc->vc_x);
557 }
558
559 static int softcursor_original = -1;
560
561 static void add_softcursor(struct vc_data *vc)
562 {
563 int i = scr_readw((u16 *) vc->vc_pos);
564 u32 type = vc->vc_cursor_type;
565
566 if (! (type & 0x10)) return;
567 if (softcursor_original != -1) return;
568 softcursor_original = i;
569 i |= ((type >> 8) & 0xff00 );
570 i ^= ((type) & 0xff00 );
571 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
572 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
573 scr_writew(i, (u16 *) vc->vc_pos);
574 if (con_should_update(vc))
575 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
576 }
577
578 static void hide_softcursor(struct vc_data *vc)
579 {
580 if (softcursor_original != -1) {
581 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
582 if (con_should_update(vc))
583 vc->vc_sw->con_putc(vc, softcursor_original,
584 vc->vc_y, vc->vc_x);
585 softcursor_original = -1;
586 }
587 }
588
589 static void hide_cursor(struct vc_data *vc)
590 {
591 if (vc == sel_cons)
592 clear_selection();
593 vc->vc_sw->con_cursor(vc, CM_ERASE);
594 hide_softcursor(vc);
595 }
596
597 static void set_cursor(struct vc_data *vc)
598 {
599 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
600 return;
601 if (vc->vc_deccm) {
602 if (vc == sel_cons)
603 clear_selection();
604 add_softcursor(vc);
605 if ((vc->vc_cursor_type & 0x0f) != 1)
606 vc->vc_sw->con_cursor(vc, CM_DRAW);
607 } else
608 hide_cursor(vc);
609 }
610
611 static void set_origin(struct vc_data *vc)
612 {
613 WARN_CONSOLE_UNLOCKED();
614
615 if (!con_is_visible(vc) ||
616 !vc->vc_sw->con_set_origin ||
617 !vc->vc_sw->con_set_origin(vc))
618 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
619 vc->vc_visible_origin = vc->vc_origin;
620 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
621 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
622 }
623
624 static void save_screen(struct vc_data *vc)
625 {
626 WARN_CONSOLE_UNLOCKED();
627
628 if (vc->vc_sw->con_save_screen)
629 vc->vc_sw->con_save_screen(vc);
630 }
631
632 /*
633 * Redrawing of screen
634 */
635
636 void clear_buffer_attributes(struct vc_data *vc)
637 {
638 unsigned short *p = (unsigned short *)vc->vc_origin;
639 int count = vc->vc_screenbuf_size / 2;
640 int mask = vc->vc_hi_font_mask | 0xff;
641
642 for (; count > 0; count--, p++) {
643 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
644 }
645 }
646
647 void redraw_screen(struct vc_data *vc, int is_switch)
648 {
649 int redraw = 0;
650
651 WARN_CONSOLE_UNLOCKED();
652
653 if (!vc) {
654 /* strange ... */
655 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
656 return;
657 }
658
659 if (is_switch) {
660 struct vc_data *old_vc = vc_cons[fg_console].d;
661 if (old_vc == vc)
662 return;
663 if (!con_is_visible(vc))
664 redraw = 1;
665 *vc->vc_display_fg = vc;
666 fg_console = vc->vc_num;
667 hide_cursor(old_vc);
668 if (!con_is_visible(old_vc)) {
669 save_screen(old_vc);
670 set_origin(old_vc);
671 }
672 if (tty0dev)
673 sysfs_notify(&tty0dev->kobj, NULL, "active");
674 /*
675 * If we are switching away from a transparent VT the contents
676 * will be lost, convert it into a blank text console then
677 * it will be repainted blank if we ever switch back.
678 */
679 if (old_vc->vc_mode == KD_TRANSPARENT)
680 old_vc->vc_mode = KD_TEXT;
681 } else {
682 hide_cursor(vc);
683 redraw = 1;
684 }
685
686 if (redraw) {
687 int update;
688 int old_was_color = vc->vc_can_do_color;
689
690 set_origin(vc);
691 update = vc->vc_sw->con_switch(vc);
692 set_palette(vc);
693 /*
694 * If console changed from mono<->color, the best we can do
695 * is to clear the buffer attributes. As it currently stands,
696 * rebuilding new attributes from the old buffer is not doable
697 * without overly complex code.
698 */
699 if (old_was_color != vc->vc_can_do_color) {
700 update_attr(vc);
701 clear_buffer_attributes(vc);
702 }
703
704 /* Forcibly update if we're panicing */
705 if ((update && vc->vc_mode != KD_GRAPHICS) ||
706 vt_force_oops_output(vc))
707 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
708 }
709 set_cursor(vc);
710 if (is_switch) {
711 set_leds();
712 compute_shiftstate();
713 notify_update(vc);
714 }
715 }
716
717 /*
718 * Allocation, freeing and resizing of VTs.
719 */
720
721 int vc_cons_allocated(unsigned int i)
722 {
723 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
724 }
725
726 static void visual_init(struct vc_data *vc, int num, int init)
727 {
728 /* ++Geert: vc->vc_sw->con_init determines console size */
729 if (vc->vc_sw)
730 module_put(vc->vc_sw->owner);
731 vc->vc_sw = conswitchp;
732 #ifndef VT_SINGLE_DRIVER
733 if (con_driver_map[num])
734 vc->vc_sw = con_driver_map[num];
735 #endif
736 __module_get(vc->vc_sw->owner);
737 vc->vc_num = num;
738 vc->vc_display_fg = &master_display_fg;
739 if (vc->vc_uni_pagedir_loc)
740 con_free_unimap(vc);
741 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
742 vc->vc_uni_pagedir = NULL;
743 vc->vc_hi_font_mask = 0;
744 vc->vc_complement_mask = 0;
745 vc->vc_can_do_color = 0;
746 vc->vc_panic_force_write = false;
747 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
748 vc->vc_sw->con_init(vc, init);
749 if (!vc->vc_complement_mask)
750 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
751 vc->vc_s_complement_mask = vc->vc_complement_mask;
752 vc->vc_size_row = vc->vc_cols << 1;
753 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
754 }
755
756 int vc_allocate(unsigned int currcons) /* return 0 on success */
757 {
758 struct vt_notifier_param param;
759 struct vc_data *vc;
760
761 WARN_CONSOLE_UNLOCKED();
762
763 if (currcons >= MAX_NR_CONSOLES)
764 return -ENXIO;
765
766 if (vc_cons[currcons].d)
767 return 0;
768
769 /* due to the granularity of kmalloc, we waste some memory here */
770 /* the alloc is done in two steps, to optimize the common situation
771 of a 25x80 console (structsize=216, screenbuf_size=4000) */
772 /* although the numbers above are not valid since long ago, the
773 point is still up-to-date and the comment still has its value
774 even if only as a historical artifact. --mj, July 1998 */
775 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
776 if (!vc)
777 return -ENOMEM;
778
779 vc_cons[currcons].d = vc;
780 tty_port_init(&vc->port);
781 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
782
783 visual_init(vc, currcons, 1);
784
785 if (!*vc->vc_uni_pagedir_loc)
786 con_set_default_unimap(vc);
787
788 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
789 if (!vc->vc_screenbuf)
790 goto err_free;
791
792 /* If no drivers have overridden us and the user didn't pass a
793 boot option, default to displaying the cursor */
794 if (global_cursor_default == -1)
795 global_cursor_default = 1;
796
797 vc_init(vc, vc->vc_rows, vc->vc_cols, 1, KD_TEXT);
798 vcs_make_sysfs(currcons);
799 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
800
801 return 0;
802 err_free:
803 kfree(vc);
804 vc_cons[currcons].d = NULL;
805 return -ENOMEM;
806 }
807
808 static inline int resize_screen(struct vc_data *vc, int width, int height,
809 int user)
810 {
811 /* Resizes the resolution of the display adapater */
812 int err = 0;
813
814 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
815 err = vc->vc_sw->con_resize(vc, width, height, user);
816
817 return err;
818 }
819
820 /*
821 * Change # of rows and columns (0 means unchanged/the size of fg_console)
822 * [this is to be used together with some user program
823 * like resize that changes the hardware videomode]
824 */
825 #define VC_RESIZE_MAXCOL (32767)
826 #define VC_RESIZE_MAXROW (32767)
827
828 /**
829 * vc_do_resize - resizing method for the tty
830 * @tty: tty being resized
831 * @real_tty: real tty (different to tty if a pty/tty pair)
832 * @vc: virtual console private data
833 * @cols: columns
834 * @lines: lines
835 *
836 * Resize a virtual console, clipping according to the actual constraints.
837 * If the caller passes a tty structure then update the termios winsize
838 * information and perform any necessary signal handling.
839 *
840 * Caller must hold the console semaphore. Takes the termios rwsem and
841 * ctrl_lock of the tty IFF a tty is passed.
842 */
843
844 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
845 unsigned int cols, unsigned int lines)
846 {
847 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
848 unsigned long end;
849 unsigned int old_rows, old_row_size;
850 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
851 unsigned int user;
852 unsigned short *newscreen;
853
854 WARN_CONSOLE_UNLOCKED();
855
856 if (!vc)
857 return -ENXIO;
858
859 user = vc->vc_resize_user;
860 vc->vc_resize_user = 0;
861
862 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
863 return -EINVAL;
864
865 new_cols = (cols ? cols : vc->vc_cols);
866 new_rows = (lines ? lines : vc->vc_rows);
867 new_row_size = new_cols << 1;
868 new_screen_size = new_row_size * new_rows;
869
870 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
871 return 0;
872
873 if (new_screen_size > (4 << 20))
874 return -EINVAL;
875 newscreen = kmalloc(new_screen_size, GFP_USER);
876 if (!newscreen)
877 return -ENOMEM;
878
879 if (vc == sel_cons)
880 clear_selection();
881
882 old_rows = vc->vc_rows;
883 old_row_size = vc->vc_size_row;
884
885 err = resize_screen(vc, new_cols, new_rows, user);
886 if (err) {
887 kfree(newscreen);
888 return err;
889 }
890
891 vc->vc_rows = new_rows;
892 vc->vc_cols = new_cols;
893 vc->vc_size_row = new_row_size;
894 vc->vc_screenbuf_size = new_screen_size;
895
896 rlth = min(old_row_size, new_row_size);
897 rrem = new_row_size - rlth;
898 old_origin = vc->vc_origin;
899 new_origin = (long) newscreen;
900 new_scr_end = new_origin + new_screen_size;
901
902 if (vc->vc_y > new_rows) {
903 if (old_rows - vc->vc_y < new_rows) {
904 /*
905 * Cursor near the bottom, copy contents from the
906 * bottom of buffer
907 */
908 old_origin += (old_rows - new_rows) * old_row_size;
909 } else {
910 /*
911 * Cursor is in no man's land, copy 1/2 screenful
912 * from the top and bottom of cursor position
913 */
914 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
915 }
916 }
917
918 end = old_origin + old_row_size * min(old_rows, new_rows);
919
920 update_attr(vc);
921
922 while (old_origin < end) {
923 scr_memcpyw((unsigned short *) new_origin,
924 (unsigned short *) old_origin, rlth);
925 if (rrem)
926 scr_memsetw((void *)(new_origin + rlth),
927 vc->vc_video_erase_char, rrem);
928 old_origin += old_row_size;
929 new_origin += new_row_size;
930 }
931 if (new_scr_end > new_origin)
932 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
933 new_scr_end - new_origin);
934 kfree(vc->vc_screenbuf);
935 vc->vc_screenbuf = newscreen;
936 vc->vc_screenbuf_size = new_screen_size;
937 set_origin(vc);
938
939 /* do part of a reset_terminal() */
940 vc->vc_top = 0;
941 vc->vc_bottom = vc->vc_rows;
942 gotoxy(vc, vc->vc_x, vc->vc_y);
943 save_cur(vc);
944
945 if (tty) {
946 /* Rewrite the requested winsize data with the actual
947 resulting sizes */
948 struct winsize ws;
949 memset(&ws, 0, sizeof(ws));
950 ws.ws_row = vc->vc_rows;
951 ws.ws_col = vc->vc_cols;
952 ws.ws_ypixel = vc->vc_scan_lines;
953 tty_do_resize(tty, &ws);
954 }
955
956 if (con_is_visible(vc))
957 update_screen(vc);
958 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
959 return err;
960 }
961
962 /**
963 * vc_resize - resize a VT
964 * @vc: virtual console
965 * @cols: columns
966 * @rows: rows
967 *
968 * Resize a virtual console as seen from the console end of things. We
969 * use the common vc_do_resize methods to update the structures. The
970 * caller must hold the console sem to protect console internals and
971 * vc->port.tty
972 */
973
974 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
975 {
976 return vc_do_resize(vc->port.tty, vc, cols, rows);
977 }
978
979 /**
980 * vt_resize - resize a VT
981 * @tty: tty to resize
982 * @ws: winsize attributes
983 *
984 * Resize a virtual terminal. This is called by the tty layer as we
985 * register our own handler for resizing. The mutual helper does all
986 * the actual work.
987 *
988 * Takes the console sem and the called methods then take the tty
989 * termios_rwsem and the tty ctrl_lock in that order.
990 */
991 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
992 {
993 struct vc_data *vc = tty->driver_data;
994 int ret;
995
996 console_lock();
997 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
998 console_unlock();
999 return ret;
1000 }
1001
1002 struct vc_data *vc_deallocate(unsigned int currcons)
1003 {
1004 struct vc_data *vc = NULL;
1005
1006 WARN_CONSOLE_UNLOCKED();
1007
1008 if (vc_cons_allocated(currcons)) {
1009 struct vt_notifier_param param;
1010
1011 param.vc = vc = vc_cons[currcons].d;
1012 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1013 vcs_remove_sysfs(currcons);
1014 vc->vc_sw->con_deinit(vc);
1015 put_pid(vc->vt_pid);
1016 module_put(vc->vc_sw->owner);
1017 kfree(vc->vc_screenbuf);
1018 vc_cons[currcons].d = NULL;
1019 }
1020 return vc;
1021 }
1022
1023 /*
1024 * VT102 emulator
1025 */
1026
1027 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1028 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1029 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1030
1031 #define decarm VC_REPEAT
1032 #define decckm VC_CKMODE
1033 #define kbdapplic VC_APPLIC
1034 #define lnm VC_CRLF
1035
1036 /*
1037 * this is what the terminal answers to a ESC-Z or csi0c query.
1038 */
1039 #define VT100ID "\033[?1;2c"
1040 #define VT102ID "\033[?6c"
1041
1042 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1043 8,12,10,14, 9,13,11,15 };
1044
1045 /* the default colour table, for VGA+ colour systems */
1046 unsigned char default_red[] = {
1047 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1048 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1049 };
1050 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1051
1052 unsigned char default_grn[] = {
1053 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1054 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1055 };
1056 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1057
1058 unsigned char default_blu[] = {
1059 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1060 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1061 };
1062 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1063
1064 /*
1065 * gotoxy() must verify all boundaries, because the arguments
1066 * might also be negative. If the given position is out of
1067 * bounds, the cursor is placed at the nearest margin.
1068 */
1069 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1070 {
1071 int min_y, max_y;
1072
1073 if (new_x < 0)
1074 vc->vc_x = 0;
1075 else {
1076 if (new_x >= vc->vc_cols)
1077 vc->vc_x = vc->vc_cols - 1;
1078 else
1079 vc->vc_x = new_x;
1080 }
1081
1082 if (vc->vc_decom) {
1083 min_y = vc->vc_top;
1084 max_y = vc->vc_bottom;
1085 } else {
1086 min_y = 0;
1087 max_y = vc->vc_rows;
1088 }
1089 if (new_y < min_y)
1090 vc->vc_y = min_y;
1091 else if (new_y >= max_y)
1092 vc->vc_y = max_y - 1;
1093 else
1094 vc->vc_y = new_y;
1095 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1096 vc->vc_need_wrap = 0;
1097 }
1098
1099 /* for absolute user moves, when decom is set */
1100 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1101 {
1102 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1103 }
1104
1105 void scrollback(struct vc_data *vc)
1106 {
1107 scrolldelta(-(vc->vc_rows / 2));
1108 }
1109
1110 void scrollfront(struct vc_data *vc, int lines)
1111 {
1112 if (!lines)
1113 lines = vc->vc_rows / 2;
1114 scrolldelta(lines);
1115 }
1116
1117 static void lf(struct vc_data *vc)
1118 {
1119 /* don't scroll if above bottom of scrolling region, or
1120 * if below scrolling region
1121 */
1122 if (vc->vc_y + 1 == vc->vc_bottom)
1123 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1124 else if (vc->vc_y < vc->vc_rows - 1) {
1125 vc->vc_y++;
1126 vc->vc_pos += vc->vc_size_row;
1127 }
1128 vc->vc_need_wrap = 0;
1129 notify_write(vc, '\n');
1130 }
1131
1132 static void ri(struct vc_data *vc)
1133 {
1134 /* don't scroll if below top of scrolling region, or
1135 * if above scrolling region
1136 */
1137 if (vc->vc_y == vc->vc_top)
1138 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1139 else if (vc->vc_y > 0) {
1140 vc->vc_y--;
1141 vc->vc_pos -= vc->vc_size_row;
1142 }
1143 vc->vc_need_wrap = 0;
1144 }
1145
1146 static inline void cr(struct vc_data *vc)
1147 {
1148 vc->vc_pos -= vc->vc_x << 1;
1149 vc->vc_need_wrap = vc->vc_x = 0;
1150 notify_write(vc, '\r');
1151 }
1152
1153 static inline void bs(struct vc_data *vc)
1154 {
1155 if (vc->vc_x) {
1156 vc->vc_pos -= 2;
1157 vc->vc_x--;
1158 vc->vc_need_wrap = 0;
1159 notify_write(vc, '\b');
1160 }
1161 }
1162
1163 static inline void del(struct vc_data *vc)
1164 {
1165 /* ignored */
1166 }
1167
1168 static void csi_J(struct vc_data *vc, int vpar)
1169 {
1170 unsigned int count;
1171 unsigned short * start;
1172
1173 switch (vpar) {
1174 case 0: /* erase from cursor to end of display */
1175 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1176 start = (unsigned short *)vc->vc_pos;
1177 break;
1178 case 1: /* erase from start to cursor */
1179 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1180 start = (unsigned short *)vc->vc_origin;
1181 break;
1182 case 3: /* erase scroll-back buffer (and whole display) */
1183 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1184 vc->vc_screenbuf_size);
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 bisearch(uint32_t ucs, const struct interval *table, int max)
2148 {
2149 int min = 0;
2150 int mid;
2151
2152 if (ucs < table[0].first || ucs > table[max].last)
2153 return 0;
2154 while (max >= min) {
2155 mid = (min + max) / 2;
2156 if (ucs > table[mid].last)
2157 min = mid + 1;
2158 else if (ucs < table[mid].first)
2159 max = mid - 1;
2160 else
2161 return 1;
2162 }
2163 return 0;
2164 }
2165
2166 static int is_double_width(uint32_t ucs)
2167 {
2168 static const struct interval double_width[] = {
2169 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2170 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2171 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2172 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2173 };
2174 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2175 }
2176
2177 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2178 unsigned long draw_to, int *draw_x)
2179 {
2180 if (*draw_x < 0)
2181 return;
2182
2183 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2184 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2185 *draw_x = -1;
2186 }
2187
2188 /* acquires console_lock */
2189 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2190 {
2191 int c, tc, ok, n = 0, draw_x = -1;
2192 unsigned int currcons;
2193 unsigned long draw_from = 0, draw_to = 0;
2194 struct vc_data *vc;
2195 unsigned char vc_attr;
2196 struct vt_notifier_param param;
2197 uint8_t rescan;
2198 uint8_t inverse;
2199 uint8_t width;
2200 u16 himask, charmask;
2201
2202 if (in_interrupt())
2203 return count;
2204
2205 might_sleep();
2206
2207 console_lock();
2208 vc = tty->driver_data;
2209 if (vc == NULL) {
2210 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2211 console_unlock();
2212 return 0;
2213 }
2214
2215 currcons = vc->vc_num;
2216 if (!vc_cons_allocated(currcons)) {
2217 /* could this happen? */
2218 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2219 console_unlock();
2220 return 0;
2221 }
2222
2223 himask = vc->vc_hi_font_mask;
2224 charmask = himask ? 0x1ff : 0xff;
2225
2226 /* undraw cursor first */
2227 if (con_is_fg(vc))
2228 hide_cursor(vc);
2229
2230 param.vc = vc;
2231
2232 while (!tty->stopped && count) {
2233 int orig = *buf;
2234 c = orig;
2235 buf++;
2236 n++;
2237 count--;
2238 rescan = 0;
2239 inverse = 0;
2240 width = 1;
2241
2242 /* Do no translation at all in control states */
2243 if (vc->vc_state != ESnormal) {
2244 tc = c;
2245 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2246 /* Combine UTF-8 into Unicode in vc_utf_char.
2247 * vc_utf_count is the number of continuation bytes still
2248 * expected to arrive.
2249 * vc_npar is the number of continuation bytes arrived so
2250 * far
2251 */
2252 rescan_last_byte:
2253 if ((c & 0xc0) == 0x80) {
2254 /* Continuation byte received */
2255 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2256 if (vc->vc_utf_count) {
2257 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2258 vc->vc_npar++;
2259 if (--vc->vc_utf_count) {
2260 /* Still need some bytes */
2261 continue;
2262 }
2263 /* Got a whole character */
2264 c = vc->vc_utf_char;
2265 /* Reject overlong sequences */
2266 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2267 c > utf8_length_changes[vc->vc_npar])
2268 c = 0xfffd;
2269 } else {
2270 /* Unexpected continuation byte */
2271 vc->vc_utf_count = 0;
2272 c = 0xfffd;
2273 }
2274 } else {
2275 /* Single ASCII byte or first byte of a sequence received */
2276 if (vc->vc_utf_count) {
2277 /* Continuation byte expected */
2278 rescan = 1;
2279 vc->vc_utf_count = 0;
2280 c = 0xfffd;
2281 } else if (c > 0x7f) {
2282 /* First byte of a multibyte sequence received */
2283 vc->vc_npar = 0;
2284 if ((c & 0xe0) == 0xc0) {
2285 vc->vc_utf_count = 1;
2286 vc->vc_utf_char = (c & 0x1f);
2287 } else if ((c & 0xf0) == 0xe0) {
2288 vc->vc_utf_count = 2;
2289 vc->vc_utf_char = (c & 0x0f);
2290 } else if ((c & 0xf8) == 0xf0) {
2291 vc->vc_utf_count = 3;
2292 vc->vc_utf_char = (c & 0x07);
2293 } else if ((c & 0xfc) == 0xf8) {
2294 vc->vc_utf_count = 4;
2295 vc->vc_utf_char = (c & 0x03);
2296 } else if ((c & 0xfe) == 0xfc) {
2297 vc->vc_utf_count = 5;
2298 vc->vc_utf_char = (c & 0x01);
2299 } else {
2300 /* 254 and 255 are invalid */
2301 c = 0xfffd;
2302 }
2303 if (vc->vc_utf_count) {
2304 /* Still need some bytes */
2305 continue;
2306 }
2307 }
2308 /* Nothing to do if an ASCII byte was received */
2309 }
2310 /* End of UTF-8 decoding. */
2311 /* c is the received character, or U+FFFD for invalid sequences. */
2312 /* Replace invalid Unicode code points with U+FFFD too */
2313 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2314 c = 0xfffd;
2315 tc = c;
2316 } else { /* no utf or alternate charset mode */
2317 tc = vc_translate(vc, c);
2318 }
2319
2320 param.c = tc;
2321 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2322 &param) == NOTIFY_STOP)
2323 continue;
2324
2325 /* If the original code was a control character we
2326 * only allow a glyph to be displayed if the code is
2327 * not normally used (such as for cursor movement) or
2328 * if the disp_ctrl mode has been explicitly enabled.
2329 * Certain characters (as given by the CTRL_ALWAYS
2330 * bitmap) are always displayed as control characters,
2331 * as the console would be pretty useless without
2332 * them; to display an arbitrary font position use the
2333 * direct-to-font zone in UTF-8 mode.
2334 */
2335 ok = tc && (c >= 32 ||
2336 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2337 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2338 && (c != 127 || vc->vc_disp_ctrl)
2339 && (c != 128+27);
2340
2341 if (vc->vc_state == ESnormal && ok) {
2342 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2343 if (is_double_width(c))
2344 width = 2;
2345 }
2346 /* Now try to find out how to display it */
2347 tc = conv_uni_to_pc(vc, tc);
2348 if (tc & ~charmask) {
2349 if (tc == -1 || tc == -2) {
2350 continue; /* nothing to display */
2351 }
2352 /* Glyph not found */
2353 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2354 /* In legacy mode use the glyph we get by a 1:1 mapping.
2355 This would make absolutely no sense with Unicode in mind,
2356 but do this for ASCII characters since a font may lack
2357 Unicode mapping info and we don't want to end up with
2358 having question marks only. */
2359 tc = c;
2360 } else {
2361 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2362 tc = conv_uni_to_pc(vc, 0xfffd);
2363 if (tc < 0) {
2364 inverse = 1;
2365 tc = conv_uni_to_pc(vc, '?');
2366 if (tc < 0) tc = '?';
2367 }
2368 }
2369 }
2370
2371 if (!inverse) {
2372 vc_attr = vc->vc_attr;
2373 } else {
2374 /* invert vc_attr */
2375 if (!vc->vc_can_do_color) {
2376 vc_attr = (vc->vc_attr) ^ 0x08;
2377 } else if (vc->vc_hi_font_mask == 0x100) {
2378 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2379 } else {
2380 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2381 }
2382 con_flush(vc, draw_from, draw_to, &draw_x);
2383 }
2384
2385 while (1) {
2386 if (vc->vc_need_wrap || vc->vc_decim)
2387 con_flush(vc, draw_from, draw_to,
2388 &draw_x);
2389 if (vc->vc_need_wrap) {
2390 cr(vc);
2391 lf(vc);
2392 }
2393 if (vc->vc_decim)
2394 insert_char(vc, 1);
2395 scr_writew(himask ?
2396 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2397 (vc_attr << 8) + tc,
2398 (u16 *) vc->vc_pos);
2399 if (con_should_update(vc) && draw_x < 0) {
2400 draw_x = vc->vc_x;
2401 draw_from = vc->vc_pos;
2402 }
2403 if (vc->vc_x == vc->vc_cols - 1) {
2404 vc->vc_need_wrap = vc->vc_decawm;
2405 draw_to = vc->vc_pos + 2;
2406 } else {
2407 vc->vc_x++;
2408 draw_to = (vc->vc_pos += 2);
2409 }
2410
2411 if (!--width) break;
2412
2413 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2414 if (tc < 0) tc = ' ';
2415 }
2416 notify_write(vc, c);
2417
2418 if (inverse)
2419 con_flush(vc, draw_from, draw_to, &draw_x);
2420
2421 if (rescan) {
2422 rescan = 0;
2423 inverse = 0;
2424 width = 1;
2425 c = orig;
2426 goto rescan_last_byte;
2427 }
2428 continue;
2429 }
2430 con_flush(vc, draw_from, draw_to, &draw_x);
2431 do_con_trol(tty, vc, orig);
2432 }
2433 con_flush(vc, draw_from, draw_to, &draw_x);
2434 console_conditional_schedule();
2435 console_unlock();
2436 notify_update(vc);
2437 return n;
2438 }
2439
2440 /*
2441 * This is the console switching callback.
2442 *
2443 * Doing console switching in a process context allows
2444 * us to do the switches asynchronously (needed when we want
2445 * to switch due to a keyboard interrupt). Synchronization
2446 * with other console code and prevention of re-entrancy is
2447 * ensured with console_lock.
2448 */
2449 static void console_callback(struct work_struct *ignored)
2450 {
2451 console_lock();
2452
2453 if (want_console >= 0) {
2454 if (want_console != fg_console &&
2455 vc_cons_allocated(want_console)) {
2456 hide_cursor(vc_cons[fg_console].d);
2457 change_console(vc_cons[want_console].d);
2458 /* we only changed when the console had already
2459 been allocated - a new console is not created
2460 in an interrupt routine */
2461 }
2462 want_console = -1;
2463 }
2464 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2465 do_poke_blanked_console = 0;
2466 poke_blanked_console();
2467 }
2468 if (scrollback_delta) {
2469 struct vc_data *vc = vc_cons[fg_console].d;
2470 clear_selection();
2471 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2472 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2473 scrollback_delta = 0;
2474 }
2475 if (blank_timer_expired) {
2476 do_blank_screen(0);
2477 blank_timer_expired = 0;
2478 }
2479 notify_update(vc_cons[fg_console].d);
2480
2481 console_unlock();
2482 }
2483
2484 int set_console(int nr)
2485 {
2486 struct vc_data *vc = vc_cons[fg_console].d;
2487
2488 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2489 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2490
2491 /*
2492 * Console switch will fail in console_callback() or
2493 * change_console() so there is no point scheduling
2494 * the callback
2495 *
2496 * Existing set_console() users don't check the return
2497 * value so this shouldn't break anything
2498 */
2499 return -EINVAL;
2500 }
2501
2502 want_console = nr;
2503 schedule_console_callback();
2504
2505 return 0;
2506 }
2507
2508 struct tty_driver *console_driver;
2509
2510 #ifdef CONFIG_VT_CONSOLE
2511
2512 /**
2513 * vt_kmsg_redirect() - Sets/gets the kernel message console
2514 * @new: The new virtual terminal number or -1 if the console should stay
2515 * unchanged
2516 *
2517 * By default, the kernel messages are always printed on the current virtual
2518 * console. However, the user may modify that default with the
2519 * TIOCL_SETKMSGREDIRECT ioctl call.
2520 *
2521 * This function sets the kernel message console to be @new. It returns the old
2522 * virtual console number. The virtual terminal number 0 (both as parameter and
2523 * return value) means no redirection (i.e. always printed on the currently
2524 * active console).
2525 *
2526 * The parameter -1 means that only the current console is returned, but the
2527 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2528 * case to make the code more understandable.
2529 *
2530 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2531 * the parameter and always returns 0.
2532 */
2533 int vt_kmsg_redirect(int new)
2534 {
2535 static int kmsg_con;
2536
2537 if (new != -1)
2538 return xchg(&kmsg_con, new);
2539 else
2540 return kmsg_con;
2541 }
2542
2543 /*
2544 * Console on virtual terminal
2545 *
2546 * The console must be locked when we get here.
2547 */
2548
2549 static void vt_console_print(struct console *co, const char *b, unsigned count)
2550 {
2551 struct vc_data *vc = vc_cons[fg_console].d;
2552 unsigned char c;
2553 static DEFINE_SPINLOCK(printing_lock);
2554 const ushort *start;
2555 ushort cnt = 0;
2556 ushort myx;
2557 int kmsg_console;
2558
2559 /* console busy or not yet initialized */
2560 if (!printable)
2561 return;
2562 if (!spin_trylock(&printing_lock))
2563 return;
2564
2565 kmsg_console = vt_get_kmsg_redirect();
2566 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2567 vc = vc_cons[kmsg_console - 1].d;
2568
2569 /* read `x' only after setting currcons properly (otherwise
2570 the `x' macro will read the x of the foreground console). */
2571 myx = vc->vc_x;
2572
2573 if (!vc_cons_allocated(fg_console)) {
2574 /* impossible */
2575 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2576 goto quit;
2577 }
2578
2579 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2580 goto quit;
2581
2582 /* undraw cursor first */
2583 if (con_is_fg(vc))
2584 hide_cursor(vc);
2585
2586 start = (ushort *)vc->vc_pos;
2587
2588 /* Contrived structure to try to emulate original need_wrap behaviour
2589 * Problems caused when we have need_wrap set on '\n' character */
2590 while (count--) {
2591 c = *b++;
2592 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2593 if (cnt > 0) {
2594 if (con_is_visible(vc))
2595 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2596 vc->vc_x += cnt;
2597 if (vc->vc_need_wrap)
2598 vc->vc_x--;
2599 cnt = 0;
2600 }
2601 if (c == 8) { /* backspace */
2602 bs(vc);
2603 start = (ushort *)vc->vc_pos;
2604 myx = vc->vc_x;
2605 continue;
2606 }
2607 if (c != 13)
2608 lf(vc);
2609 cr(vc);
2610 start = (ushort *)vc->vc_pos;
2611 myx = vc->vc_x;
2612 if (c == 10 || c == 13)
2613 continue;
2614 }
2615 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2616 notify_write(vc, c);
2617 cnt++;
2618 if (myx == vc->vc_cols - 1) {
2619 vc->vc_need_wrap = 1;
2620 continue;
2621 }
2622 vc->vc_pos += 2;
2623 myx++;
2624 }
2625 if (cnt > 0) {
2626 if (con_is_visible(vc))
2627 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2628 vc->vc_x += cnt;
2629 if (vc->vc_x == vc->vc_cols) {
2630 vc->vc_x--;
2631 vc->vc_need_wrap = 1;
2632 }
2633 }
2634 set_cursor(vc);
2635 notify_update(vc);
2636
2637 quit:
2638 spin_unlock(&printing_lock);
2639 }
2640
2641 static struct tty_driver *vt_console_device(struct console *c, int *index)
2642 {
2643 *index = c->index ? c->index-1 : fg_console;
2644 return console_driver;
2645 }
2646
2647 static struct console vt_console_driver = {
2648 .name = "tty",
2649 .write = vt_console_print,
2650 .device = vt_console_device,
2651 .unblank = unblank_screen,
2652 .flags = CON_PRINTBUFFER,
2653 .index = -1,
2654 };
2655 #endif
2656
2657 /*
2658 * Handling of Linux-specific VC ioctls
2659 */
2660
2661 /*
2662 * Generally a bit racy with respect to console_lock();.
2663 *
2664 * There are some functions which don't need it.
2665 *
2666 * There are some functions which can sleep for arbitrary periods
2667 * (paste_selection) but we don't need the lock there anyway.
2668 *
2669 * set_selection has locking, and definitely needs it
2670 */
2671
2672 int tioclinux(struct tty_struct *tty, unsigned long arg)
2673 {
2674 char type, data;
2675 char __user *p = (char __user *)arg;
2676 int lines;
2677 int ret;
2678
2679 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2680 return -EPERM;
2681 if (get_user(type, p))
2682 return -EFAULT;
2683 ret = 0;
2684
2685 switch (type)
2686 {
2687 case TIOCL_SETSEL:
2688 console_lock();
2689 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2690 console_unlock();
2691 break;
2692 case TIOCL_PASTESEL:
2693 ret = paste_selection(tty);
2694 break;
2695 case TIOCL_UNBLANKSCREEN:
2696 console_lock();
2697 unblank_screen();
2698 console_unlock();
2699 break;
2700 case TIOCL_SELLOADLUT:
2701 console_lock();
2702 ret = sel_loadlut(p);
2703 console_unlock();
2704 break;
2705 case TIOCL_GETSHIFTSTATE:
2706
2707 /*
2708 * Make it possible to react to Shift+Mousebutton.
2709 * Note that 'shift_state' is an undocumented
2710 * kernel-internal variable; programs not closely
2711 * related to the kernel should not use this.
2712 */
2713 data = vt_get_shift_state();
2714 ret = __put_user(data, p);
2715 break;
2716 case TIOCL_GETMOUSEREPORTING:
2717 console_lock(); /* May be overkill */
2718 data = mouse_reporting();
2719 console_unlock();
2720 ret = __put_user(data, p);
2721 break;
2722 case TIOCL_SETVESABLANK:
2723 console_lock();
2724 ret = set_vesa_blanking(p);
2725 console_unlock();
2726 break;
2727 case TIOCL_GETKMSGREDIRECT:
2728 data = vt_get_kmsg_redirect();
2729 ret = __put_user(data, p);
2730 break;
2731 case TIOCL_SETKMSGREDIRECT:
2732 if (!capable(CAP_SYS_ADMIN)) {
2733 ret = -EPERM;
2734 } else {
2735 if (get_user(data, p+1))
2736 ret = -EFAULT;
2737 else
2738 vt_kmsg_redirect(data);
2739 }
2740 break;
2741 case TIOCL_GETFGCONSOLE:
2742 /* No locking needed as this is a transiently
2743 correct return anyway if the caller hasn't
2744 disabled switching */
2745 ret = fg_console;
2746 break;
2747 case TIOCL_SCROLLCONSOLE:
2748 if (get_user(lines, (s32 __user *)(p+4))) {
2749 ret = -EFAULT;
2750 } else {
2751 /* Need the console lock here. Note that lots
2752 of other calls need fixing before the lock
2753 is actually useful ! */
2754 console_lock();
2755 scrollfront(vc_cons[fg_console].d, lines);
2756 console_unlock();
2757 ret = 0;
2758 }
2759 break;
2760 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2761 console_lock();
2762 ignore_poke = 1;
2763 do_blank_screen(0);
2764 console_unlock();
2765 break;
2766 case TIOCL_BLANKEDSCREEN:
2767 ret = console_blanked;
2768 break;
2769 default:
2770 ret = -EINVAL;
2771 break;
2772 }
2773 return ret;
2774 }
2775
2776 /*
2777 * /dev/ttyN handling
2778 */
2779
2780 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2781 {
2782 int retval;
2783
2784 retval = do_con_write(tty, buf, count);
2785 con_flush_chars(tty);
2786
2787 return retval;
2788 }
2789
2790 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2791 {
2792 if (in_interrupt())
2793 return 0; /* n_r3964 calls put_char() from interrupt context */
2794 return do_con_write(tty, &ch, 1);
2795 }
2796
2797 static int con_write_room(struct tty_struct *tty)
2798 {
2799 if (tty->stopped)
2800 return 0;
2801 return 32768; /* No limit, really; we're not buffering */
2802 }
2803
2804 static int con_chars_in_buffer(struct tty_struct *tty)
2805 {
2806 return 0; /* we're not buffering */
2807 }
2808
2809 /*
2810 * con_throttle and con_unthrottle are only used for
2811 * paste_selection(), which has to stuff in a large number of
2812 * characters...
2813 */
2814 static void con_throttle(struct tty_struct *tty)
2815 {
2816 }
2817
2818 static void con_unthrottle(struct tty_struct *tty)
2819 {
2820 struct vc_data *vc = tty->driver_data;
2821
2822 wake_up_interruptible(&vc->paste_wait);
2823 }
2824
2825 /*
2826 * Turn the Scroll-Lock LED on when the tty is stopped
2827 */
2828 static void con_stop(struct tty_struct *tty)
2829 {
2830 int console_num;
2831 if (!tty)
2832 return;
2833 console_num = tty->index;
2834 if (!vc_cons_allocated(console_num))
2835 return;
2836 vt_kbd_con_stop(console_num);
2837 }
2838
2839 /*
2840 * Turn the Scroll-Lock LED off when the console is started
2841 */
2842 static void con_start(struct tty_struct *tty)
2843 {
2844 int console_num;
2845 if (!tty)
2846 return;
2847 console_num = tty->index;
2848 if (!vc_cons_allocated(console_num))
2849 return;
2850 vt_kbd_con_start(console_num);
2851 }
2852
2853 static void con_flush_chars(struct tty_struct *tty)
2854 {
2855 struct vc_data *vc;
2856
2857 if (in_interrupt()) /* from flush_to_ldisc */
2858 return;
2859
2860 /* if we race with con_close(), vt may be null */
2861 console_lock();
2862 vc = tty->driver_data;
2863 if (vc)
2864 set_cursor(vc);
2865 console_unlock();
2866 }
2867
2868 /*
2869 * Allocate the console screen memory.
2870 */
2871 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2872 {
2873 unsigned int currcons = tty->index;
2874 struct vc_data *vc;
2875 int ret;
2876
2877 console_lock();
2878 ret = vc_allocate(currcons);
2879 if (ret)
2880 goto unlock;
2881
2882 vc = vc_cons[currcons].d;
2883
2884 /* Still being freed */
2885 if (vc->port.tty) {
2886 ret = -ERESTARTSYS;
2887 goto unlock;
2888 }
2889
2890 ret = tty_port_install(&vc->port, driver, tty);
2891 if (ret)
2892 goto unlock;
2893
2894 tty->driver_data = vc;
2895 vc->port.tty = tty;
2896
2897 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2898 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2899 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2900 }
2901 if (vc->vc_utf)
2902 tty->termios.c_iflag |= IUTF8;
2903 else
2904 tty->termios.c_iflag &= ~IUTF8;
2905 unlock:
2906 console_unlock();
2907 return ret;
2908 }
2909
2910 static int con_open(struct tty_struct *tty, struct file *filp)
2911 {
2912 /* everything done in install */
2913 return 0;
2914 }
2915
2916
2917 static void con_close(struct tty_struct *tty, struct file *filp)
2918 {
2919 /* Nothing to do - we defer to shutdown */
2920 }
2921
2922 static void con_shutdown(struct tty_struct *tty)
2923 {
2924 struct vc_data *vc = tty->driver_data;
2925 BUG_ON(vc == NULL);
2926 console_lock();
2927 vc->port.tty = NULL;
2928 console_unlock();
2929 }
2930
2931 static int default_color = 7; /* white */
2932 static int default_italic_color = 2; // green (ASCII)
2933 static int default_underline_color = 3; // cyan (ASCII)
2934 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2935 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2936 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2937
2938 static void vc_init(struct vc_data *vc, unsigned int rows,
2939 unsigned int cols, int do_clear, int mode)
2940 {
2941 int j, k ;
2942
2943 vc->vc_cols = cols;
2944 vc->vc_rows = rows;
2945 vc->vc_size_row = cols << 1;
2946 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2947
2948 set_origin(vc);
2949 vc->vc_pos = vc->vc_origin;
2950 reset_vc(vc, mode);
2951 for (j=k=0; j<16; j++) {
2952 vc->vc_palette[k++] = default_red[j] ;
2953 vc->vc_palette[k++] = default_grn[j] ;
2954 vc->vc_palette[k++] = default_blu[j] ;
2955 }
2956 vc->vc_def_color = default_color;
2957 vc->vc_ulcolor = default_underline_color;
2958 vc->vc_itcolor = default_italic_color;
2959 vc->vc_halfcolor = 0x08; /* grey */
2960 init_waitqueue_head(&vc->paste_wait);
2961 reset_terminal(vc, do_clear);
2962 }
2963
2964 /*
2965 * This routine initializes console interrupts, and does nothing
2966 * else. If you want the screen to clear, call tty_write with
2967 * the appropriate escape-sequence.
2968 */
2969
2970 static int __init con_init(void)
2971 {
2972 const char *display_desc = NULL;
2973 struct vc_data *vc;
2974 unsigned int currcons = 0, i;
2975
2976 console_lock();
2977
2978 if (conswitchp)
2979 display_desc = conswitchp->con_startup();
2980 if (!display_desc) {
2981 fg_console = 0;
2982 console_unlock();
2983 return 0;
2984 }
2985
2986 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2987 struct con_driver *con_driver = &registered_con_driver[i];
2988
2989 if (con_driver->con == NULL) {
2990 con_driver->con = conswitchp;
2991 con_driver->desc = display_desc;
2992 con_driver->flag = CON_DRIVER_FLAG_INIT;
2993 con_driver->first = 0;
2994 con_driver->last = MAX_NR_CONSOLES - 1;
2995 break;
2996 }
2997 }
2998
2999 for (i = 0; i < MAX_NR_CONSOLES; i++)
3000 con_driver_map[i] = conswitchp;
3001
3002 if (blankinterval) {
3003 blank_state = blank_normal_wait;
3004 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3005 }
3006
3007 if (vt_handoff > 0 && vt_handoff <= MAX_NR_CONSOLES) {
3008 currcons = vt_handoff - 1;
3009 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3010 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3011 tty_port_init(&vc->port);
3012 visual_init(vc, currcons, 1);
3013 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3014 vc_init(vc, vc->vc_rows, vc->vc_cols, 0, KD_TRANSPARENT);
3015 }
3016 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3017 if (currcons == vt_handoff - 1)
3018 continue;
3019 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3020 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3021 tty_port_init(&vc->port);
3022 visual_init(vc, currcons, 1);
3023 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3024 vc_init(vc, vc->vc_rows, vc->vc_cols,
3025 currcons || !vc->vc_sw->con_save_screen, KD_TEXT);
3026 }
3027 currcons = fg_console = 0;
3028 if (vt_handoff > 0) {
3029 printk(KERN_INFO "vt handoff: transparent VT on vt#%d\n",
3030 vt_handoff);
3031 currcons = fg_console = vt_handoff - 1;
3032 }
3033 master_display_fg = vc = vc_cons[currcons].d;
3034 set_origin(vc);
3035 save_screen(vc);
3036 gotoxy(vc, vc->vc_x, vc->vc_y);
3037 csi_J(vc, 0);
3038 update_screen(vc);
3039 pr_info("Console: %s %s %dx%d\n",
3040 vc->vc_can_do_color ? "colour" : "mono",
3041 display_desc, vc->vc_cols, vc->vc_rows);
3042 printable = 1;
3043
3044 console_unlock();
3045
3046 #ifdef CONFIG_VT_CONSOLE
3047 register_console(&vt_console_driver);
3048 #endif
3049 return 0;
3050 }
3051 console_initcall(con_init);
3052
3053 static const struct tty_operations con_ops = {
3054 .install = con_install,
3055 .open = con_open,
3056 .close = con_close,
3057 .write = con_write,
3058 .write_room = con_write_room,
3059 .put_char = con_put_char,
3060 .flush_chars = con_flush_chars,
3061 .chars_in_buffer = con_chars_in_buffer,
3062 .ioctl = vt_ioctl,
3063 #ifdef CONFIG_COMPAT
3064 .compat_ioctl = vt_compat_ioctl,
3065 #endif
3066 .stop = con_stop,
3067 .start = con_start,
3068 .throttle = con_throttle,
3069 .unthrottle = con_unthrottle,
3070 .resize = vt_resize,
3071 .shutdown = con_shutdown
3072 };
3073
3074 static struct cdev vc0_cdev;
3075
3076 static ssize_t show_tty_active(struct device *dev,
3077 struct device_attribute *attr, char *buf)
3078 {
3079 return sprintf(buf, "tty%d\n", fg_console + 1);
3080 }
3081 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3082
3083 static struct attribute *vt_dev_attrs[] = {
3084 &dev_attr_active.attr,
3085 NULL
3086 };
3087
3088 ATTRIBUTE_GROUPS(vt_dev);
3089
3090 int __init vty_init(const struct file_operations *console_fops)
3091 {
3092 cdev_init(&vc0_cdev, console_fops);
3093 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3094 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3095 panic("Couldn't register /dev/tty0 driver\n");
3096 tty0dev = device_create_with_groups(tty_class, NULL,
3097 MKDEV(TTY_MAJOR, 0), NULL,
3098 vt_dev_groups, "tty0");
3099 if (IS_ERR(tty0dev))
3100 tty0dev = NULL;
3101
3102 vcs_init();
3103
3104 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3105 if (!console_driver)
3106 panic("Couldn't allocate console driver\n");
3107
3108 console_driver->name = "tty";
3109 console_driver->name_base = 1;
3110 console_driver->major = TTY_MAJOR;
3111 console_driver->minor_start = 1;
3112 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3113 console_driver->init_termios = tty_std_termios;
3114 if (default_utf8)
3115 console_driver->init_termios.c_iflag |= IUTF8;
3116 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3117 tty_set_operations(console_driver, &con_ops);
3118 if (tty_register_driver(console_driver))
3119 panic("Couldn't register console driver\n");
3120 kbd_init();
3121 console_map_init();
3122 #ifdef CONFIG_MDA_CONSOLE
3123 mda_console_init();
3124 #endif
3125 return 0;
3126 }
3127
3128 #ifndef VT_SINGLE_DRIVER
3129
3130 static struct class *vtconsole_class;
3131
3132 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3133 int deflt)
3134 {
3135 struct module *owner = csw->owner;
3136 const char *desc = NULL;
3137 struct con_driver *con_driver;
3138 int i, j = -1, k = -1, retval = -ENODEV;
3139
3140 if (!try_module_get(owner))
3141 return -ENODEV;
3142
3143 WARN_CONSOLE_UNLOCKED();
3144
3145 /* check if driver is registered */
3146 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3147 con_driver = &registered_con_driver[i];
3148
3149 if (con_driver->con == csw) {
3150 desc = con_driver->desc;
3151 retval = 0;
3152 break;
3153 }
3154 }
3155
3156 if (retval)
3157 goto err;
3158
3159 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3160 csw->con_startup();
3161 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3162 }
3163
3164 if (deflt) {
3165 if (conswitchp)
3166 module_put(conswitchp->owner);
3167
3168 __module_get(owner);
3169 conswitchp = csw;
3170 }
3171
3172 first = max(first, con_driver->first);
3173 last = min(last, con_driver->last);
3174
3175 for (i = first; i <= last; i++) {
3176 int old_was_color;
3177 struct vc_data *vc = vc_cons[i].d;
3178
3179 if (con_driver_map[i])
3180 module_put(con_driver_map[i]->owner);
3181 __module_get(owner);
3182 con_driver_map[i] = csw;
3183
3184 if (!vc || !vc->vc_sw)
3185 continue;
3186
3187 j = i;
3188
3189 if (con_is_visible(vc)) {
3190 k = i;
3191 save_screen(vc);
3192 }
3193
3194 old_was_color = vc->vc_can_do_color;
3195 vc->vc_sw->con_deinit(vc);
3196 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3197 visual_init(vc, i, 0);
3198 set_origin(vc);
3199 update_attr(vc);
3200
3201 /* If the console changed between mono <-> color, then
3202 * the attributes in the screenbuf will be wrong. The
3203 * following resets all attributes to something sane.
3204 */
3205 if (old_was_color != vc->vc_can_do_color)
3206 clear_buffer_attributes(vc);
3207 }
3208
3209 pr_info("Console: switching ");
3210 if (!deflt)
3211 printk(KERN_CONT "consoles %d-%d ", first+1, last+1);
3212 if (j >= 0) {
3213 struct vc_data *vc = vc_cons[j].d;
3214
3215 printk(KERN_CONT "to %s %s %dx%d\n",
3216 vc->vc_can_do_color ? "colour" : "mono",
3217 desc, vc->vc_cols, vc->vc_rows);
3218
3219 if (k >= 0) {
3220 vc = vc_cons[k].d;
3221 update_screen(vc);
3222 }
3223 } else
3224 printk(KERN_CONT "to %s\n", desc);
3225
3226 retval = 0;
3227 err:
3228 module_put(owner);
3229 return retval;
3230 };
3231
3232
3233 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3234 /* unlocked version of unbind_con_driver() */
3235 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3236 {
3237 struct module *owner = csw->owner;
3238 const struct consw *defcsw = NULL;
3239 struct con_driver *con_driver = NULL, *con_back = NULL;
3240 int i, retval = -ENODEV;
3241
3242 if (!try_module_get(owner))
3243 return -ENODEV;
3244
3245 WARN_CONSOLE_UNLOCKED();
3246
3247 /* check if driver is registered and if it is unbindable */
3248 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3249 con_driver = &registered_con_driver[i];
3250
3251 if (con_driver->con == csw &&
3252 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3253 retval = 0;
3254 break;
3255 }
3256 }
3257
3258 if (retval)
3259 goto err;
3260
3261 retval = -ENODEV;
3262
3263 /* check if backup driver exists */
3264 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3265 con_back = &registered_con_driver[i];
3266
3267 if (con_back->con && con_back->con != csw) {
3268 defcsw = con_back->con;
3269 retval = 0;
3270 break;
3271 }
3272 }
3273
3274 if (retval)
3275 goto err;
3276
3277 if (!con_is_bound(csw))
3278 goto err;
3279
3280 first = max(first, con_driver->first);
3281 last = min(last, con_driver->last);
3282
3283 for (i = first; i <= last; i++) {
3284 if (con_driver_map[i] == csw) {
3285 module_put(csw->owner);
3286 con_driver_map[i] = NULL;
3287 }
3288 }
3289
3290 if (!con_is_bound(defcsw)) {
3291 const struct consw *defconsw = conswitchp;
3292
3293 defcsw->con_startup();
3294 con_back->flag |= CON_DRIVER_FLAG_INIT;
3295 /*
3296 * vgacon may change the default driver to point
3297 * to dummycon, we restore it here...
3298 */
3299 conswitchp = defconsw;
3300 }
3301
3302 if (!con_is_bound(csw))
3303 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3304
3305 /* ignore return value, binding should not fail */
3306 do_bind_con_driver(defcsw, first, last, deflt);
3307 err:
3308 module_put(owner);
3309 return retval;
3310
3311 }
3312 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3313
3314 static int vt_bind(struct con_driver *con)
3315 {
3316 const struct consw *defcsw = NULL, *csw = NULL;
3317 int i, more = 1, first = -1, last = -1, deflt = 0;
3318
3319 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3320 goto err;
3321
3322 csw = con->con;
3323
3324 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3325 struct con_driver *con = &registered_con_driver[i];
3326
3327 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3328 defcsw = con->con;
3329 break;
3330 }
3331 }
3332
3333 if (!defcsw)
3334 goto err;
3335
3336 while (more) {
3337 more = 0;
3338
3339 for (i = con->first; i <= con->last; i++) {
3340 if (con_driver_map[i] == defcsw) {
3341 if (first == -1)
3342 first = i;
3343 last = i;
3344 more = 1;
3345 } else if (first != -1)
3346 break;
3347 }
3348
3349 if (first == 0 && last == MAX_NR_CONSOLES -1)
3350 deflt = 1;
3351
3352 if (first != -1)
3353 do_bind_con_driver(csw, first, last, deflt);
3354
3355 first = -1;
3356 last = -1;
3357 deflt = 0;
3358 }
3359
3360 err:
3361 return 0;
3362 }
3363
3364 static int vt_unbind(struct con_driver *con)
3365 {
3366 const struct consw *csw = NULL;
3367 int i, more = 1, first = -1, last = -1, deflt = 0;
3368 int ret;
3369
3370 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3371 goto err;
3372
3373 csw = con->con;
3374
3375 while (more) {
3376 more = 0;
3377
3378 for (i = con->first; i <= con->last; i++) {
3379 if (con_driver_map[i] == csw) {
3380 if (first == -1)
3381 first = i;
3382 last = i;
3383 more = 1;
3384 } else if (first != -1)
3385 break;
3386 }
3387
3388 if (first == 0 && last == MAX_NR_CONSOLES -1)
3389 deflt = 1;
3390
3391 if (first != -1) {
3392 ret = do_unbind_con_driver(csw, first, last, deflt);
3393 if (ret != 0)
3394 return ret;
3395 }
3396
3397 first = -1;
3398 last = -1;
3399 deflt = 0;
3400 }
3401
3402 err:
3403 return 0;
3404 }
3405 #else
3406 static inline int vt_bind(struct con_driver *con)
3407 {
3408 return 0;
3409 }
3410 static inline int vt_unbind(struct con_driver *con)
3411 {
3412 return 0;
3413 }
3414 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3415
3416 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3417 const char *buf, size_t count)
3418 {
3419 struct con_driver *con = dev_get_drvdata(dev);
3420 int bind = simple_strtoul(buf, NULL, 0);
3421
3422 console_lock();
3423
3424 if (bind)
3425 vt_bind(con);
3426 else
3427 vt_unbind(con);
3428
3429 console_unlock();
3430
3431 return count;
3432 }
3433
3434 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3435 char *buf)
3436 {
3437 struct con_driver *con = dev_get_drvdata(dev);
3438 int bind = con_is_bound(con->con);
3439
3440 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3441 }
3442
3443 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3444 char *buf)
3445 {
3446 struct con_driver *con = dev_get_drvdata(dev);
3447
3448 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3449 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3450 con->desc);
3451
3452 }
3453
3454 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3455 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3456
3457 static struct attribute *con_dev_attrs[] = {
3458 &dev_attr_bind.attr,
3459 &dev_attr_name.attr,
3460 NULL
3461 };
3462
3463 ATTRIBUTE_GROUPS(con_dev);
3464
3465 static int vtconsole_init_device(struct con_driver *con)
3466 {
3467 con->flag |= CON_DRIVER_FLAG_ATTR;
3468 return 0;
3469 }
3470
3471 static void vtconsole_deinit_device(struct con_driver *con)
3472 {
3473 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3474 }
3475
3476 /**
3477 * con_is_bound - checks if driver is bound to the console
3478 * @csw: console driver
3479 *
3480 * RETURNS: zero if unbound, nonzero if bound
3481 *
3482 * Drivers can call this and if zero, they should release
3483 * all resources allocated on con_startup()
3484 */
3485 int con_is_bound(const struct consw *csw)
3486 {
3487 int i, bound = 0;
3488
3489 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3490 if (con_driver_map[i] == csw) {
3491 bound = 1;
3492 break;
3493 }
3494 }
3495
3496 return bound;
3497 }
3498 EXPORT_SYMBOL(con_is_bound);
3499
3500 /**
3501 * con_debug_enter - prepare the console for the kernel debugger
3502 * @sw: console driver
3503 *
3504 * Called when the console is taken over by the kernel debugger, this
3505 * function needs to save the current console state, then put the console
3506 * into a state suitable for the kernel debugger.
3507 *
3508 * RETURNS:
3509 * Zero on success, nonzero if a failure occurred when trying to prepare
3510 * the console for the debugger.
3511 */
3512 int con_debug_enter(struct vc_data *vc)
3513 {
3514 int ret = 0;
3515
3516 saved_fg_console = fg_console;
3517 saved_last_console = last_console;
3518 saved_want_console = want_console;
3519 saved_vc_mode = vc->vc_mode;
3520 saved_console_blanked = console_blanked;
3521 vc->vc_mode = KD_TEXT;
3522 console_blanked = 0;
3523 if (vc->vc_sw->con_debug_enter)
3524 ret = vc->vc_sw->con_debug_enter(vc);
3525 #ifdef CONFIG_KGDB_KDB
3526 /* Set the initial LINES variable if it is not already set */
3527 if (vc->vc_rows < 999) {
3528 int linecount;
3529 char lns[4];
3530 const char *setargs[3] = {
3531 "set",
3532 "LINES",
3533 lns,
3534 };
3535 if (kdbgetintenv(setargs[0], &linecount)) {
3536 snprintf(lns, 4, "%i", vc->vc_rows);
3537 kdb_set(2, setargs);
3538 }
3539 }
3540 if (vc->vc_cols < 999) {
3541 int colcount;
3542 char cols[4];
3543 const char *setargs[3] = {
3544 "set",
3545 "COLUMNS",
3546 cols,
3547 };
3548 if (kdbgetintenv(setargs[0], &colcount)) {
3549 snprintf(cols, 4, "%i", vc->vc_cols);
3550 kdb_set(2, setargs);
3551 }
3552 }
3553 #endif /* CONFIG_KGDB_KDB */
3554 return ret;
3555 }
3556 EXPORT_SYMBOL_GPL(con_debug_enter);
3557
3558 /**
3559 * con_debug_leave - restore console state
3560 * @sw: console driver
3561 *
3562 * Restore the console state to what it was before the kernel debugger
3563 * was invoked.
3564 *
3565 * RETURNS:
3566 * Zero on success, nonzero if a failure occurred when trying to restore
3567 * the console.
3568 */
3569 int con_debug_leave(void)
3570 {
3571 struct vc_data *vc;
3572 int ret = 0;
3573
3574 fg_console = saved_fg_console;
3575 last_console = saved_last_console;
3576 want_console = saved_want_console;
3577 console_blanked = saved_console_blanked;
3578 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3579
3580 vc = vc_cons[fg_console].d;
3581 if (vc->vc_sw->con_debug_leave)
3582 ret = vc->vc_sw->con_debug_leave(vc);
3583 return ret;
3584 }
3585 EXPORT_SYMBOL_GPL(con_debug_leave);
3586
3587 static int do_register_con_driver(const struct consw *csw, int first, int last)
3588 {
3589 struct module *owner = csw->owner;
3590 struct con_driver *con_driver;
3591 const char *desc;
3592 int i, retval;
3593
3594 WARN_CONSOLE_UNLOCKED();
3595
3596 if (!try_module_get(owner))
3597 return -ENODEV;
3598
3599 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3600 con_driver = &registered_con_driver[i];
3601
3602 /* already registered */
3603 if (con_driver->con == csw) {
3604 retval = -EBUSY;
3605 goto err;
3606 }
3607 }
3608
3609 desc = csw->con_startup();
3610 if (!desc) {
3611 retval = -ENODEV;
3612 goto err;
3613 }
3614
3615 retval = -EINVAL;
3616
3617 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3618 con_driver = &registered_con_driver[i];
3619
3620 if (con_driver->con == NULL &&
3621 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3622 con_driver->con = csw;
3623 con_driver->desc = desc;
3624 con_driver->node = i;
3625 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3626 CON_DRIVER_FLAG_INIT;
3627 con_driver->first = first;
3628 con_driver->last = last;
3629 retval = 0;
3630 break;
3631 }
3632 }
3633
3634 if (retval)
3635 goto err;
3636
3637 con_driver->dev =
3638 device_create_with_groups(vtconsole_class, NULL,
3639 MKDEV(0, con_driver->node),
3640 con_driver, con_dev_groups,
3641 "vtcon%i", con_driver->node);
3642 if (IS_ERR(con_driver->dev)) {
3643 printk(KERN_WARNING "Unable to create device for %s; "
3644 "errno = %ld\n", con_driver->desc,
3645 PTR_ERR(con_driver->dev));
3646 con_driver->dev = NULL;
3647 } else {
3648 vtconsole_init_device(con_driver);
3649 }
3650
3651 err:
3652 module_put(owner);
3653 return retval;
3654 }
3655
3656
3657 /**
3658 * do_unregister_con_driver - unregister console driver from console layer
3659 * @csw: console driver
3660 *
3661 * DESCRIPTION: All drivers that registers to the console layer must
3662 * call this function upon exit, or if the console driver is in a state
3663 * where it won't be able to handle console services, such as the
3664 * framebuffer console without loaded framebuffer drivers.
3665 *
3666 * The driver must unbind first prior to unregistration.
3667 */
3668 int do_unregister_con_driver(const struct consw *csw)
3669 {
3670 int i;
3671
3672 /* cannot unregister a bound driver */
3673 if (con_is_bound(csw))
3674 return -EBUSY;
3675
3676 if (csw == conswitchp)
3677 return -EINVAL;
3678
3679 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3680 struct con_driver *con_driver = &registered_con_driver[i];
3681
3682 if (con_driver->con == csw) {
3683 /*
3684 * Defer the removal of the sysfs entries since that
3685 * will acquire the kernfs s_active lock and we can't
3686 * acquire this lock while holding the console lock:
3687 * the unbind sysfs entry imposes already the opposite
3688 * order. Reset con already here to prevent any later
3689 * lookup to succeed and mark this slot as zombie, so
3690 * it won't get reused until we complete the removal
3691 * in the deferred work.
3692 */
3693 con_driver->con = NULL;
3694 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3695 schedule_work(&con_driver_unregister_work);
3696
3697 return 0;
3698 }
3699 }
3700
3701 return -ENODEV;
3702 }
3703 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3704
3705 static void con_driver_unregister_callback(struct work_struct *ignored)
3706 {
3707 int i;
3708
3709 console_lock();
3710
3711 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3712 struct con_driver *con_driver = &registered_con_driver[i];
3713
3714 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3715 continue;
3716
3717 console_unlock();
3718
3719 vtconsole_deinit_device(con_driver);
3720 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3721
3722 console_lock();
3723
3724 if (WARN_ON_ONCE(con_driver->con))
3725 con_driver->con = NULL;
3726 con_driver->desc = NULL;
3727 con_driver->dev = NULL;
3728 con_driver->node = 0;
3729 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3730 con_driver->flag = 0;
3731 con_driver->first = 0;
3732 con_driver->last = 0;
3733 }
3734
3735 console_unlock();
3736 }
3737
3738 /*
3739 * If we support more console drivers, this function is used
3740 * when a driver wants to take over some existing consoles
3741 * and become default driver for newly opened ones.
3742 *
3743 * do_take_over_console is basically a register followed by unbind
3744 */
3745 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3746 {
3747 int err;
3748
3749 err = do_register_con_driver(csw, first, last);
3750 /*
3751 * If we get an busy error we still want to bind the console driver
3752 * and return success, as we may have unbound the console driver
3753 * but not unregistered it.
3754 */
3755 if (err == -EBUSY)
3756 err = 0;
3757 if (!err)
3758 do_bind_con_driver(csw, first, last, deflt);
3759
3760 return err;
3761 }
3762 EXPORT_SYMBOL_GPL(do_take_over_console);
3763
3764
3765 /*
3766 * give_up_console is a wrapper to unregister_con_driver. It will only
3767 * work if driver is fully unbound.
3768 */
3769 void give_up_console(const struct consw *csw)
3770 {
3771 console_lock();
3772 do_unregister_con_driver(csw);
3773 console_unlock();
3774 }
3775
3776 static int __init vtconsole_class_init(void)
3777 {
3778 int i;
3779
3780 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3781 if (IS_ERR(vtconsole_class)) {
3782 printk(KERN_WARNING "Unable to create vt console class; "
3783 "errno = %ld\n", PTR_ERR(vtconsole_class));
3784 vtconsole_class = NULL;
3785 }
3786
3787 /* Add system drivers to sysfs */
3788 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3789 struct con_driver *con = &registered_con_driver[i];
3790
3791 if (con->con && !con->dev) {
3792 con->dev =
3793 device_create_with_groups(vtconsole_class, NULL,
3794 MKDEV(0, con->node),
3795 con, con_dev_groups,
3796 "vtcon%i", con->node);
3797
3798 if (IS_ERR(con->dev)) {
3799 printk(KERN_WARNING "Unable to create "
3800 "device for %s; errno = %ld\n",
3801 con->desc, PTR_ERR(con->dev));
3802 con->dev = NULL;
3803 } else {
3804 vtconsole_init_device(con);
3805 }
3806 }
3807 }
3808
3809 return 0;
3810 }
3811 postcore_initcall(vtconsole_class_init);
3812
3813 #endif
3814
3815 /*
3816 * Screen blanking
3817 */
3818
3819 static int set_vesa_blanking(char __user *p)
3820 {
3821 unsigned int mode;
3822
3823 if (get_user(mode, p + 1))
3824 return -EFAULT;
3825
3826 vesa_blank_mode = (mode < 4) ? mode : 0;
3827 return 0;
3828 }
3829
3830 void do_blank_screen(int entering_gfx)
3831 {
3832 struct vc_data *vc = vc_cons[fg_console].d;
3833 int i;
3834
3835 WARN_CONSOLE_UNLOCKED();
3836
3837 if (console_blanked) {
3838 if (blank_state == blank_vesa_wait) {
3839 blank_state = blank_off;
3840 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3841 }
3842 return;
3843 }
3844
3845 /* entering graphics mode? */
3846 if (entering_gfx) {
3847 hide_cursor(vc);
3848 save_screen(vc);
3849 vc->vc_sw->con_blank(vc, -1, 1);
3850 console_blanked = fg_console + 1;
3851 blank_state = blank_off;
3852 set_origin(vc);
3853 return;
3854 }
3855
3856 if (blank_state != blank_normal_wait)
3857 return;
3858 blank_state = blank_off;
3859
3860 /* don't blank graphics */
3861 if (vc->vc_mode != KD_TEXT) {
3862 console_blanked = fg_console + 1;
3863 return;
3864 }
3865
3866 hide_cursor(vc);
3867 del_timer_sync(&console_timer);
3868 blank_timer_expired = 0;
3869
3870 save_screen(vc);
3871 /* In case we need to reset origin, blanking hook returns 1 */
3872 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3873 console_blanked = fg_console + 1;
3874 if (i)
3875 set_origin(vc);
3876
3877 if (console_blank_hook && console_blank_hook(1))
3878 return;
3879
3880 if (vesa_off_interval && vesa_blank_mode) {
3881 blank_state = blank_vesa_wait;
3882 mod_timer(&console_timer, jiffies + vesa_off_interval);
3883 }
3884 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3885 }
3886 EXPORT_SYMBOL(do_blank_screen);
3887
3888 /*
3889 * Called by timer as well as from vt_console_driver
3890 */
3891 void do_unblank_screen(int leaving_gfx)
3892 {
3893 struct vc_data *vc;
3894
3895 /* This should now always be called from a "sane" (read: can schedule)
3896 * context for the sake of the low level drivers, except in the special
3897 * case of oops_in_progress
3898 */
3899 if (!oops_in_progress)
3900 might_sleep();
3901
3902 WARN_CONSOLE_UNLOCKED();
3903
3904 ignore_poke = 0;
3905 if (!console_blanked)
3906 return;
3907 if (!vc_cons_allocated(fg_console)) {
3908 /* impossible */
3909 pr_warn("unblank_screen: tty %d not allocated ??\n",
3910 fg_console + 1);
3911 return;
3912 }
3913 vc = vc_cons[fg_console].d;
3914 /* Try to unblank in oops case too */
3915 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3916 return; /* but leave console_blanked != 0 */
3917
3918 if (blankinterval) {
3919 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3920 blank_state = blank_normal_wait;
3921 }
3922
3923 console_blanked = 0;
3924 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3925 /* Low-level driver cannot restore -> do it ourselves */
3926 update_screen(vc);
3927 if (console_blank_hook)
3928 console_blank_hook(0);
3929 set_palette(vc);
3930 set_cursor(vc);
3931 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3932 }
3933 EXPORT_SYMBOL(do_unblank_screen);
3934
3935 /*
3936 * This is called by the outside world to cause a forced unblank, mostly for
3937 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3938 * call it with 1 as an argument and so force a mode restore... that may kill
3939 * X or at least garbage the screen but would also make the Oops visible...
3940 */
3941 void unblank_screen(void)
3942 {
3943 do_unblank_screen(0);
3944 }
3945
3946 /*
3947 * We defer the timer blanking to work queue so it can take the console mutex
3948 * (console operations can still happen at irq time, but only from printk which
3949 * has the console mutex. Not perfect yet, but better than no locking
3950 */
3951 static void blank_screen_t(unsigned long dummy)
3952 {
3953 blank_timer_expired = 1;
3954 schedule_work(&console_work);
3955 }
3956
3957 void poke_blanked_console(void)
3958 {
3959 WARN_CONSOLE_UNLOCKED();
3960
3961 /* Add this so we quickly catch whoever might call us in a non
3962 * safe context. Nowadays, unblank_screen() isn't to be called in
3963 * atomic contexts and is allowed to schedule (with the special case
3964 * of oops_in_progress, but that isn't of any concern for this
3965 * function. --BenH.
3966 */
3967 might_sleep();
3968
3969 /* This isn't perfectly race free, but a race here would be mostly harmless,
3970 * at worse, we'll do a spurrious blank and it's unlikely
3971 */
3972 del_timer(&console_timer);
3973 blank_timer_expired = 0;
3974
3975 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3976 return;
3977 if (console_blanked)
3978 unblank_screen();
3979 else if (blankinterval) {
3980 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3981 blank_state = blank_normal_wait;
3982 }
3983 }
3984
3985 /*
3986 * Palettes
3987 */
3988
3989 static void set_palette(struct vc_data *vc)
3990 {
3991 WARN_CONSOLE_UNLOCKED();
3992
3993 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3994 vc->vc_sw->con_set_palette(vc, color_table);
3995 }
3996
3997 /*
3998 * Load palette into the DAC registers. arg points to a colour
3999 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4000 */
4001
4002 int con_set_cmap(unsigned char __user *arg)
4003 {
4004 int i, j, k;
4005 unsigned char colormap[3*16];
4006
4007 if (copy_from_user(colormap, arg, sizeof(colormap)))
4008 return -EFAULT;
4009
4010 console_lock();
4011 for (i = k = 0; i < 16; i++) {
4012 default_red[i] = colormap[k++];
4013 default_grn[i] = colormap[k++];
4014 default_blu[i] = colormap[k++];
4015 }
4016 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4017 if (!vc_cons_allocated(i))
4018 continue;
4019 for (j = k = 0; j < 16; j++) {
4020 vc_cons[i].d->vc_palette[k++] = default_red[j];
4021 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4022 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4023 }
4024 set_palette(vc_cons[i].d);
4025 }
4026 console_unlock();
4027
4028 return 0;
4029 }
4030
4031 int con_get_cmap(unsigned char __user *arg)
4032 {
4033 int i, k;
4034 unsigned char colormap[3*16];
4035
4036 console_lock();
4037 for (i = k = 0; i < 16; i++) {
4038 colormap[k++] = default_red[i];
4039 colormap[k++] = default_grn[i];
4040 colormap[k++] = default_blu[i];
4041 }
4042 console_unlock();
4043
4044 if (copy_to_user(arg, colormap, sizeof(colormap)))
4045 return -EFAULT;
4046
4047 return 0;
4048 }
4049
4050 void reset_palette(struct vc_data *vc)
4051 {
4052 int j, k;
4053 for (j=k=0; j<16; j++) {
4054 vc->vc_palette[k++] = default_red[j];
4055 vc->vc_palette[k++] = default_grn[j];
4056 vc->vc_palette[k++] = default_blu[j];
4057 }
4058 set_palette(vc);
4059 }
4060
4061 /*
4062 * Font switching
4063 *
4064 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4065 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4066 * depending on width) reserved for each character which is kinda wasty, but
4067 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4068 * is up to the actual low-level console-driver convert data into its favorite
4069 * format (maybe we should add a `fontoffset' field to the `display'
4070 * structure so we won't have to convert the fontdata all the time.
4071 * /Jes
4072 */
4073
4074 #define max_font_size 65536
4075
4076 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4077 {
4078 struct console_font font;
4079 int rc = -EINVAL;
4080 int c;
4081
4082 if (op->data) {
4083 font.data = kmalloc(max_font_size, GFP_KERNEL);
4084 if (!font.data)
4085 return -ENOMEM;
4086 } else
4087 font.data = NULL;
4088
4089 console_lock();
4090 if (vc->vc_mode != KD_TEXT)
4091 rc = -EINVAL;
4092 else if (vc->vc_sw->con_font_get)
4093 rc = vc->vc_sw->con_font_get(vc, &font);
4094 else
4095 rc = -ENOSYS;
4096 console_unlock();
4097
4098 if (rc)
4099 goto out;
4100
4101 c = (font.width+7)/8 * 32 * font.charcount;
4102
4103 if (op->data && font.charcount > op->charcount)
4104 rc = -ENOSPC;
4105 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4106 if (font.width > op->width || font.height > op->height)
4107 rc = -ENOSPC;
4108 } else {
4109 if (font.width != 8)
4110 rc = -EIO;
4111 else if ((op->height && font.height > op->height) ||
4112 font.height > 32)
4113 rc = -ENOSPC;
4114 }
4115 if (rc)
4116 goto out;
4117
4118 op->height = font.height;
4119 op->width = font.width;
4120 op->charcount = font.charcount;
4121
4122 if (op->data && copy_to_user(op->data, font.data, c))
4123 rc = -EFAULT;
4124
4125 out:
4126 kfree(font.data);
4127 return rc;
4128 }
4129
4130 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4131 {
4132 struct console_font font;
4133 int rc = -EINVAL;
4134 int size;
4135
4136 if (vc->vc_mode != KD_TEXT)
4137 return -EINVAL;
4138 if (!op->data)
4139 return -EINVAL;
4140 if (op->charcount > 512)
4141 return -EINVAL;
4142 if (!op->height) { /* Need to guess font height [compat] */
4143 int h, i;
4144 u8 __user *charmap = op->data;
4145 u8 tmp;
4146
4147 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4148 so that we can get rid of this soon */
4149 if (!(op->flags & KD_FONT_FLAG_OLD))
4150 return -EINVAL;
4151 for (h = 32; h > 0; h--)
4152 for (i = 0; i < op->charcount; i++) {
4153 if (get_user(tmp, &charmap[32*i+h-1]))
4154 return -EFAULT;
4155 if (tmp)
4156 goto nonzero;
4157 }
4158 return -EINVAL;
4159 nonzero:
4160 op->height = h;
4161 }
4162 if (op->width <= 0 || op->width > 32 || op->height > 32)
4163 return -EINVAL;
4164 size = (op->width+7)/8 * 32 * op->charcount;
4165 if (size > max_font_size)
4166 return -ENOSPC;
4167 font.charcount = op->charcount;
4168 font.height = op->height;
4169 font.width = op->width;
4170 font.data = memdup_user(op->data, size);
4171 if (IS_ERR(font.data))
4172 return PTR_ERR(font.data);
4173 console_lock();
4174 if (vc->vc_mode != KD_TEXT)
4175 rc = -EINVAL;
4176 else if (vc->vc_sw->con_font_set)
4177 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4178 else
4179 rc = -ENOSYS;
4180 console_unlock();
4181 kfree(font.data);
4182 return rc;
4183 }
4184
4185 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4186 {
4187 struct console_font font = {.width = op->width, .height = op->height};
4188 char name[MAX_FONT_NAME];
4189 char *s = name;
4190 int rc;
4191
4192
4193 if (!op->data)
4194 s = NULL;
4195 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4196 return -EFAULT;
4197 else
4198 name[MAX_FONT_NAME - 1] = 0;
4199
4200 console_lock();
4201 if (vc->vc_mode != KD_TEXT) {
4202 console_unlock();
4203 return -EINVAL;
4204 }
4205 if (vc->vc_sw->con_font_default)
4206 rc = vc->vc_sw->con_font_default(vc, &font, s);
4207 else
4208 rc = -ENOSYS;
4209 console_unlock();
4210 if (!rc) {
4211 op->width = font.width;
4212 op->height = font.height;
4213 }
4214 return rc;
4215 }
4216
4217 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4218 {
4219 int con = op->height;
4220 int rc;
4221
4222
4223 console_lock();
4224 if (vc->vc_mode != KD_TEXT)
4225 rc = -EINVAL;
4226 else if (!vc->vc_sw->con_font_copy)
4227 rc = -ENOSYS;
4228 else if (con < 0 || !vc_cons_allocated(con))
4229 rc = -ENOTTY;
4230 else if (con == vc->vc_num) /* nothing to do */
4231 rc = 0;
4232 else
4233 rc = vc->vc_sw->con_font_copy(vc, con);
4234 console_unlock();
4235 return rc;
4236 }
4237
4238 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4239 {
4240 switch (op->op) {
4241 case KD_FONT_OP_SET:
4242 return con_font_set(vc, op);
4243 case KD_FONT_OP_GET:
4244 return con_font_get(vc, op);
4245 case KD_FONT_OP_SET_DEFAULT:
4246 return con_font_default(vc, op);
4247 case KD_FONT_OP_COPY:
4248 return con_font_copy(vc, op);
4249 }
4250 return -ENOSYS;
4251 }
4252
4253 /*
4254 * Interface exported to selection and vcs.
4255 */
4256
4257 /* used by selection */
4258 u16 screen_glyph(struct vc_data *vc, int offset)
4259 {
4260 u16 w = scr_readw(screenpos(vc, offset, 1));
4261 u16 c = w & 0xff;
4262
4263 if (w & vc->vc_hi_font_mask)
4264 c |= 0x100;
4265 return c;
4266 }
4267 EXPORT_SYMBOL_GPL(screen_glyph);
4268
4269 /* used by vcs - note the word offset */
4270 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4271 {
4272 return screenpos(vc, 2 * w_offset, viewed);
4273 }
4274 EXPORT_SYMBOL_GPL(screen_pos);
4275
4276 void getconsxy(struct vc_data *vc, unsigned char *p)
4277 {
4278 p[0] = vc->vc_x;
4279 p[1] = vc->vc_y;
4280 }
4281
4282 void putconsxy(struct vc_data *vc, unsigned char *p)
4283 {
4284 hide_cursor(vc);
4285 gotoxy(vc, p[0], p[1]);
4286 set_cursor(vc);
4287 }
4288
4289 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4290 {
4291 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4292 return softcursor_original;
4293 return scr_readw(org);
4294 }
4295
4296 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4297 {
4298 scr_writew(val, org);
4299 if ((unsigned long)org == vc->vc_pos) {
4300 softcursor_original = -1;
4301 add_softcursor(vc);
4302 }
4303 }
4304
4305 void vcs_scr_updated(struct vc_data *vc)
4306 {
4307 notify_update(vc);
4308 }
4309
4310 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4311 unsigned int rolled_over, void *base, unsigned int size)
4312 {
4313 unsigned long ubase = (unsigned long)base;
4314 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4315 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4316 ptrdiff_t origin = (void *)c->vc_origin - base;
4317 int margin = c->vc_size_row * 4;
4318 int from, wrap, from_off, avail;
4319
4320 /* Turn scrollback off */
4321 if (!lines) {
4322 c->vc_visible_origin = c->vc_origin;
4323 return;
4324 }
4325
4326 /* Do we have already enough to allow jumping from 0 to the end? */
4327 if (rolled_over > scr_end + margin) {
4328 from = scr_end;
4329 wrap = rolled_over + c->vc_size_row;
4330 } else {
4331 from = 0;
4332 wrap = size;
4333 }
4334
4335 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4336 avail = (origin - from + wrap) % wrap;
4337
4338 /* Only a little piece would be left? Show all incl. the piece! */
4339 if (avail < 2 * margin)
4340 margin = 0;
4341 if (from_off < margin)
4342 from_off = 0;
4343 if (from_off > avail - margin)
4344 from_off = avail;
4345
4346 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4347 }
4348 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4349
4350 /*
4351 * Visible symbols for modules
4352 */
4353
4354 EXPORT_SYMBOL(color_table);
4355 EXPORT_SYMBOL(default_red);
4356 EXPORT_SYMBOL(default_grn);
4357 EXPORT_SYMBOL(default_blu);
4358 EXPORT_SYMBOL(update_region);
4359 EXPORT_SYMBOL(redraw_screen);
4360 EXPORT_SYMBOL(vc_resize);
4361 EXPORT_SYMBOL(fg_console);
4362 EXPORT_SYMBOL(console_blank_hook);
4363 EXPORT_SYMBOL(console_blanked);
4364 EXPORT_SYMBOL(vc_cons);
4365 EXPORT_SYMBOL(global_cursor_default);
4366 #ifndef VT_SINGLE_DRIVER
4367 EXPORT_SYMBOL(give_up_console);
4368 #endif
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