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[GitHub/LineageOS/android_kernel_motorola_exynos9610.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/signal.h>
76 #include <linux/tty.h>
77 #include <linux/tty_flip.h>
78 #include <linux/kernel.h>
79 #include <linux/string.h>
80 #include <linux/errno.h>
81 #include <linux/kd.h>
82 #include <linux/slab.h>
83 #include <linux/major.h>
84 #include <linux/mm.h>
85 #include <linux/console.h>
86 #include <linux/init.h>
87 #include <linux/mutex.h>
88 #include <linux/vt_kern.h>
89 #include <linux/selection.h>
90 #include <linux/tiocl.h>
91 #include <linux/kbd_kern.h>
92 #include <linux/consolemap.h>
93 #include <linux/timer.h>
94 #include <linux/interrupt.h>
95 #include <linux/workqueue.h>
96 #include <linux/pm.h>
97 #include <linux/font.h>
98 #include <linux/bitops.h>
99 #include <linux/notifier.h>
100 #include <linux/device.h>
101 #include <linux/io.h>
102 #include <linux/uaccess.h>
103 #include <linux/kdb.h>
104 #include <linux/ctype.h>
105
106 #define MAX_NR_CON_DRIVER 16
107
108 #define CON_DRIVER_FLAG_MODULE 1
109 #define CON_DRIVER_FLAG_INIT 2
110 #define CON_DRIVER_FLAG_ATTR 4
111 #define CON_DRIVER_FLAG_ZOMBIE 8
112
113 struct con_driver {
114 const struct consw *con;
115 const char *desc;
116 struct device *dev;
117 int node;
118 int first;
119 int last;
120 int flag;
121 };
122
123 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
124 const struct consw *conswitchp;
125
126 /* A bitmap for codes <32. A bit of 1 indicates that the code
127 * corresponding to that bit number invokes some special action
128 * (such as cursor movement) and should not be displayed as a
129 * glyph unless the disp_ctrl mode is explicitly enabled.
130 */
131 #define CTRL_ACTION 0x0d00ff81
132 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
133
134 /*
135 * Here is the default bell parameters: 750HZ, 1/8th of a second
136 */
137 #define DEFAULT_BELL_PITCH 750
138 #define DEFAULT_BELL_DURATION (HZ/8)
139 #define DEFAULT_CURSOR_BLINK_MS 200
140
141 struct vc vc_cons [MAX_NR_CONSOLES];
142
143 #ifndef VT_SINGLE_DRIVER
144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145 #endif
146
147 static int con_open(struct tty_struct *, struct file *);
148 static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151 static void save_cur(struct vc_data *vc);
152 static void reset_terminal(struct vc_data *vc, int do_clear);
153 static void con_flush_chars(struct tty_struct *tty);
154 static int set_vesa_blanking(char __user *p);
155 static void set_cursor(struct vc_data *vc);
156 static void hide_cursor(struct vc_data *vc);
157 static void console_callback(struct work_struct *ignored);
158 static void con_driver_unregister_callback(struct work_struct *ignored);
159 static void blank_screen_t(unsigned long dummy);
160 static void set_palette(struct vc_data *vc);
161
162 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
163
164 static int printable; /* Is console ready for printing? */
165 int default_utf8 = true;
166 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
167 int global_cursor_default = -1;
168 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
169
170 static int cur_default = CUR_DEFAULT;
171 module_param(cur_default, int, S_IRUGO | S_IWUSR);
172
173 /*
174 * ignore_poke: don't unblank the screen when things are typed. This is
175 * mainly for the privacy of braille terminal users.
176 */
177 static int ignore_poke;
178
179 int do_poke_blanked_console;
180 int console_blanked;
181
182 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
183 static int vesa_off_interval;
184 static int blankinterval;
185 core_param(consoleblank, blankinterval, int, 0444);
186
187 static DECLARE_WORK(console_work, console_callback);
188 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
189
190 /*
191 * fg_console is the current virtual console,
192 * last_console is the last used one,
193 * want_console is the console we want to switch to,
194 * saved_* variants are for save/restore around kernel debugger enter/leave
195 */
196 int fg_console;
197 int last_console;
198 int want_console = -1;
199 static int saved_fg_console;
200 static int saved_last_console;
201 static int saved_want_console;
202 static int saved_vc_mode;
203 static int saved_console_blanked;
204
205 /*
206 * For each existing display, we have a pointer to console currently visible
207 * on that display, allowing consoles other than fg_console to be refreshed
208 * appropriately. Unless the low-level driver supplies its own display_fg
209 * variable, we use this one for the "master display".
210 */
211 static struct vc_data *master_display_fg;
212
213 /*
214 * Unfortunately, we need to delay tty echo when we're currently writing to the
215 * console since the code is (and always was) not re-entrant, so we schedule
216 * all flip requests to process context with schedule-task() and run it from
217 * console_callback().
218 */
219
220 /*
221 * For the same reason, we defer scrollback to the console callback.
222 */
223 static int scrollback_delta;
224
225 /*
226 * Hook so that the power management routines can (un)blank
227 * the console on our behalf.
228 */
229 int (*console_blank_hook)(int);
230
231 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
232 static int blank_state;
233 static int blank_timer_expired;
234 enum {
235 blank_off = 0,
236 blank_normal_wait,
237 blank_vesa_wait,
238 };
239
240 /*
241 * /sys/class/tty/tty0/
242 *
243 * the attribute 'active' contains the name of the current vc
244 * console and it supports poll() to detect vc switches
245 */
246 static struct device *tty0dev;
247
248 /*
249 * Notifier list for console events.
250 */
251 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
252
253 int register_vt_notifier(struct notifier_block *nb)
254 {
255 return atomic_notifier_chain_register(&vt_notifier_list, nb);
256 }
257 EXPORT_SYMBOL_GPL(register_vt_notifier);
258
259 int unregister_vt_notifier(struct notifier_block *nb)
260 {
261 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
262 }
263 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
264
265 static void notify_write(struct vc_data *vc, unsigned int unicode)
266 {
267 struct vt_notifier_param param = { .vc = vc, .c = unicode };
268 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
269 }
270
271 static void notify_update(struct vc_data *vc)
272 {
273 struct vt_notifier_param param = { .vc = vc };
274 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
275 }
276 /*
277 * Low-Level Functions
278 */
279
280 static inline bool con_is_fg(const struct vc_data *vc)
281 {
282 return vc->vc_num == fg_console;
283 }
284
285 static inline bool con_should_update(const struct vc_data *vc)
286 {
287 return con_is_visible(vc) && !console_blanked;
288 }
289
290 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
291 {
292 unsigned short *p;
293
294 if (!viewed)
295 p = (unsigned short *)(vc->vc_origin + offset);
296 else if (!vc->vc_sw->con_screen_pos)
297 p = (unsigned short *)(vc->vc_visible_origin + offset);
298 else
299 p = vc->vc_sw->con_screen_pos(vc, offset);
300 return p;
301 }
302
303 /* Called from the keyboard irq path.. */
304 static inline void scrolldelta(int lines)
305 {
306 /* FIXME */
307 /* scrolldelta needs some kind of consistency lock, but the BKL was
308 and still is not protecting versus the scheduled back end */
309 scrollback_delta += lines;
310 schedule_console_callback();
311 }
312
313 void schedule_console_callback(void)
314 {
315 schedule_work(&console_work);
316 }
317
318 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
319 enum con_scroll dir, unsigned int nr)
320 {
321 u16 *clear, *d, *s;
322
323 if (t + nr >= b)
324 nr = b - t - 1;
325 if (b > vc->vc_rows || t >= b || nr < 1)
326 return;
327 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
328 return;
329
330 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
331 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
332
333 if (dir == SM_UP) {
334 clear = s + (b - t - nr) * vc->vc_cols;
335 swap(s, d);
336 }
337 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
338 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
339 }
340
341 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
342 {
343 unsigned int xx, yy, offset;
344 u16 *p;
345
346 p = (u16 *) start;
347 if (!vc->vc_sw->con_getxy) {
348 offset = (start - vc->vc_origin) / 2;
349 xx = offset % vc->vc_cols;
350 yy = offset / vc->vc_cols;
351 } else {
352 int nxx, nyy;
353 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
354 xx = nxx; yy = nyy;
355 }
356 for(;;) {
357 u16 attrib = scr_readw(p) & 0xff00;
358 int startx = xx;
359 u16 *q = p;
360 while (xx < vc->vc_cols && count) {
361 if (attrib != (scr_readw(p) & 0xff00)) {
362 if (p > q)
363 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
364 startx = xx;
365 q = p;
366 attrib = scr_readw(p) & 0xff00;
367 }
368 p++;
369 xx++;
370 count--;
371 }
372 if (p > q)
373 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
374 if (!count)
375 break;
376 xx = 0;
377 yy++;
378 if (vc->vc_sw->con_getxy) {
379 p = (u16 *)start;
380 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
381 }
382 }
383 }
384
385 void update_region(struct vc_data *vc, unsigned long start, int count)
386 {
387 WARN_CONSOLE_UNLOCKED();
388
389 if (con_should_update(vc)) {
390 hide_cursor(vc);
391 do_update_region(vc, start, count);
392 set_cursor(vc);
393 }
394 }
395
396 /* Structure of attributes is hardware-dependent */
397
398 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
399 u8 _underline, u8 _reverse, u8 _italic)
400 {
401 if (vc->vc_sw->con_build_attr)
402 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
403 _blink, _underline, _reverse, _italic);
404
405 /*
406 * ++roman: I completely changed the attribute format for monochrome
407 * mode (!can_do_color). The formerly used MDA (monochrome display
408 * adapter) format didn't allow the combination of certain effects.
409 * Now the attribute is just a bit vector:
410 * Bit 0..1: intensity (0..2)
411 * Bit 2 : underline
412 * Bit 3 : reverse
413 * Bit 7 : blink
414 */
415 {
416 u8 a = _color;
417 if (!vc->vc_can_do_color)
418 return _intensity |
419 (_italic ? 2 : 0) |
420 (_underline ? 4 : 0) |
421 (_reverse ? 8 : 0) |
422 (_blink ? 0x80 : 0);
423 if (_italic)
424 a = (a & 0xF0) | vc->vc_itcolor;
425 else if (_underline)
426 a = (a & 0xf0) | vc->vc_ulcolor;
427 else if (_intensity == 0)
428 a = (a & 0xf0) | vc->vc_halfcolor;
429 if (_reverse)
430 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
431 if (_blink)
432 a ^= 0x80;
433 if (_intensity == 2)
434 a ^= 0x08;
435 if (vc->vc_hi_font_mask == 0x100)
436 a <<= 1;
437 return a;
438 }
439 }
440
441 static void update_attr(struct vc_data *vc)
442 {
443 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
444 vc->vc_blink, vc->vc_underline,
445 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
446 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
447 }
448
449 /* Note: inverting the screen twice should revert to the original state */
450 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
451 {
452 unsigned short *p;
453
454 WARN_CONSOLE_UNLOCKED();
455
456 count /= 2;
457 p = screenpos(vc, offset, viewed);
458 if (vc->vc_sw->con_invert_region) {
459 vc->vc_sw->con_invert_region(vc, p, count);
460 } else {
461 u16 *q = p;
462 int cnt = count;
463 u16 a;
464
465 if (!vc->vc_can_do_color) {
466 while (cnt--) {
467 a = scr_readw(q);
468 a ^= 0x0800;
469 scr_writew(a, q);
470 q++;
471 }
472 } else if (vc->vc_hi_font_mask == 0x100) {
473 while (cnt--) {
474 a = scr_readw(q);
475 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
476 scr_writew(a, q);
477 q++;
478 }
479 } else {
480 while (cnt--) {
481 a = scr_readw(q);
482 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
483 scr_writew(a, q);
484 q++;
485 }
486 }
487 }
488
489 if (con_should_update(vc))
490 do_update_region(vc, (unsigned long) p, count);
491 notify_update(vc);
492 }
493
494 /* used by selection: complement pointer position */
495 void complement_pos(struct vc_data *vc, int offset)
496 {
497 static int old_offset = -1;
498 static unsigned short old;
499 static unsigned short oldx, oldy;
500
501 WARN_CONSOLE_UNLOCKED();
502
503 if (old_offset != -1 && old_offset >= 0 &&
504 old_offset < vc->vc_screenbuf_size) {
505 scr_writew(old, screenpos(vc, old_offset, 1));
506 if (con_should_update(vc))
507 vc->vc_sw->con_putc(vc, old, oldy, oldx);
508 notify_update(vc);
509 }
510
511 old_offset = offset;
512
513 if (offset != -1 && offset >= 0 &&
514 offset < vc->vc_screenbuf_size) {
515 unsigned short new;
516 unsigned short *p;
517 p = screenpos(vc, offset, 1);
518 old = scr_readw(p);
519 new = old ^ vc->vc_complement_mask;
520 scr_writew(new, p);
521 if (con_should_update(vc)) {
522 oldx = (offset >> 1) % vc->vc_cols;
523 oldy = (offset >> 1) / vc->vc_cols;
524 vc->vc_sw->con_putc(vc, new, oldy, oldx);
525 }
526 notify_update(vc);
527 }
528 }
529
530 static void insert_char(struct vc_data *vc, unsigned int nr)
531 {
532 unsigned short *p = (unsigned short *) vc->vc_pos;
533
534 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
535 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
536 vc->vc_need_wrap = 0;
537 if (con_should_update(vc))
538 do_update_region(vc, (unsigned long) p,
539 vc->vc_cols - vc->vc_x);
540 }
541
542 static void delete_char(struct vc_data *vc, unsigned int nr)
543 {
544 unsigned short *p = (unsigned short *) vc->vc_pos;
545
546 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
547 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
548 nr * 2);
549 vc->vc_need_wrap = 0;
550 if (con_should_update(vc))
551 do_update_region(vc, (unsigned long) p,
552 vc->vc_cols - vc->vc_x);
553 }
554
555 static int softcursor_original = -1;
556
557 static void add_softcursor(struct vc_data *vc)
558 {
559 int i = scr_readw((u16 *) vc->vc_pos);
560 u32 type = vc->vc_cursor_type;
561
562 if (! (type & 0x10)) return;
563 if (softcursor_original != -1) return;
564 softcursor_original = i;
565 i |= ((type >> 8) & 0xff00 );
566 i ^= ((type) & 0xff00 );
567 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
568 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
569 scr_writew(i, (u16 *) vc->vc_pos);
570 if (con_should_update(vc))
571 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
572 }
573
574 static void hide_softcursor(struct vc_data *vc)
575 {
576 if (softcursor_original != -1) {
577 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
578 if (con_should_update(vc))
579 vc->vc_sw->con_putc(vc, softcursor_original,
580 vc->vc_y, vc->vc_x);
581 softcursor_original = -1;
582 }
583 }
584
585 static void hide_cursor(struct vc_data *vc)
586 {
587 if (vc == sel_cons)
588 clear_selection();
589 vc->vc_sw->con_cursor(vc, CM_ERASE);
590 hide_softcursor(vc);
591 }
592
593 static void set_cursor(struct vc_data *vc)
594 {
595 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
596 return;
597 if (vc->vc_deccm) {
598 if (vc == sel_cons)
599 clear_selection();
600 add_softcursor(vc);
601 if ((vc->vc_cursor_type & 0x0f) != 1)
602 vc->vc_sw->con_cursor(vc, CM_DRAW);
603 } else
604 hide_cursor(vc);
605 }
606
607 static void set_origin(struct vc_data *vc)
608 {
609 WARN_CONSOLE_UNLOCKED();
610
611 if (!con_is_visible(vc) ||
612 !vc->vc_sw->con_set_origin ||
613 !vc->vc_sw->con_set_origin(vc))
614 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
615 vc->vc_visible_origin = vc->vc_origin;
616 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
617 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
618 }
619
620 static void save_screen(struct vc_data *vc)
621 {
622 WARN_CONSOLE_UNLOCKED();
623
624 if (vc->vc_sw->con_save_screen)
625 vc->vc_sw->con_save_screen(vc);
626 }
627
628 static void flush_scrollback(struct vc_data *vc)
629 {
630 WARN_CONSOLE_UNLOCKED();
631
632 if (vc->vc_sw->con_flush_scrollback)
633 vc->vc_sw->con_flush_scrollback(vc);
634 }
635
636 /*
637 * Redrawing of screen
638 */
639
640 void clear_buffer_attributes(struct vc_data *vc)
641 {
642 unsigned short *p = (unsigned short *)vc->vc_origin;
643 int count = vc->vc_screenbuf_size / 2;
644 int mask = vc->vc_hi_font_mask | 0xff;
645
646 for (; count > 0; count--, p++) {
647 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
648 }
649 }
650
651 void redraw_screen(struct vc_data *vc, int is_switch)
652 {
653 int redraw = 0;
654
655 WARN_CONSOLE_UNLOCKED();
656
657 if (!vc) {
658 /* strange ... */
659 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
660 return;
661 }
662
663 if (is_switch) {
664 struct vc_data *old_vc = vc_cons[fg_console].d;
665 if (old_vc == vc)
666 return;
667 if (!con_is_visible(vc))
668 redraw = 1;
669 *vc->vc_display_fg = vc;
670 fg_console = vc->vc_num;
671 hide_cursor(old_vc);
672 if (!con_is_visible(old_vc)) {
673 save_screen(old_vc);
674 set_origin(old_vc);
675 }
676 if (tty0dev)
677 sysfs_notify(&tty0dev->kobj, NULL, "active");
678 } else {
679 hide_cursor(vc);
680 redraw = 1;
681 }
682
683 if (redraw) {
684 int update;
685 int old_was_color = vc->vc_can_do_color;
686
687 set_origin(vc);
688 update = vc->vc_sw->con_switch(vc);
689 set_palette(vc);
690 /*
691 * If console changed from mono<->color, the best we can do
692 * is to clear the buffer attributes. As it currently stands,
693 * rebuilding new attributes from the old buffer is not doable
694 * without overly complex code.
695 */
696 if (old_was_color != vc->vc_can_do_color) {
697 update_attr(vc);
698 clear_buffer_attributes(vc);
699 }
700
701 /* Forcibly update if we're panicing */
702 if ((update && vc->vc_mode != KD_GRAPHICS) ||
703 vt_force_oops_output(vc))
704 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
705 }
706 set_cursor(vc);
707 if (is_switch) {
708 set_leds();
709 compute_shiftstate();
710 notify_update(vc);
711 }
712 }
713
714 /*
715 * Allocation, freeing and resizing of VTs.
716 */
717
718 int vc_cons_allocated(unsigned int i)
719 {
720 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
721 }
722
723 static void visual_init(struct vc_data *vc, int num, int init)
724 {
725 /* ++Geert: vc->vc_sw->con_init determines console size */
726 if (vc->vc_sw)
727 module_put(vc->vc_sw->owner);
728 vc->vc_sw = conswitchp;
729 #ifndef VT_SINGLE_DRIVER
730 if (con_driver_map[num])
731 vc->vc_sw = con_driver_map[num];
732 #endif
733 __module_get(vc->vc_sw->owner);
734 vc->vc_num = num;
735 vc->vc_display_fg = &master_display_fg;
736 if (vc->vc_uni_pagedir_loc)
737 con_free_unimap(vc);
738 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
739 vc->vc_uni_pagedir = NULL;
740 vc->vc_hi_font_mask = 0;
741 vc->vc_complement_mask = 0;
742 vc->vc_can_do_color = 0;
743 vc->vc_panic_force_write = false;
744 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
745 vc->vc_sw->con_init(vc, init);
746 if (!vc->vc_complement_mask)
747 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
748 vc->vc_s_complement_mask = vc->vc_complement_mask;
749 vc->vc_size_row = vc->vc_cols << 1;
750 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
751 }
752
753 int vc_allocate(unsigned int currcons) /* return 0 on success */
754 {
755 struct vt_notifier_param param;
756 struct vc_data *vc;
757
758 WARN_CONSOLE_UNLOCKED();
759
760 if (currcons >= MAX_NR_CONSOLES)
761 return -ENXIO;
762
763 if (vc_cons[currcons].d)
764 return 0;
765
766 /* due to the granularity of kmalloc, we waste some memory here */
767 /* the alloc is done in two steps, to optimize the common situation
768 of a 25x80 console (structsize=216, screenbuf_size=4000) */
769 /* although the numbers above are not valid since long ago, the
770 point is still up-to-date and the comment still has its value
771 even if only as a historical artifact. --mj, July 1998 */
772 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
773 if (!vc)
774 return -ENOMEM;
775
776 vc_cons[currcons].d = vc;
777 tty_port_init(&vc->port);
778 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
779
780 visual_init(vc, currcons, 1);
781
782 if (!*vc->vc_uni_pagedir_loc)
783 con_set_default_unimap(vc);
784
785 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
786 if (!vc->vc_screenbuf)
787 goto err_free;
788
789 /* If no drivers have overridden us and the user didn't pass a
790 boot option, default to displaying the cursor */
791 if (global_cursor_default == -1)
792 global_cursor_default = 1;
793
794 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
795 vcs_make_sysfs(currcons);
796 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
797
798 return 0;
799 err_free:
800 kfree(vc);
801 vc_cons[currcons].d = NULL;
802 return -ENOMEM;
803 }
804
805 static inline int resize_screen(struct vc_data *vc, int width, int height,
806 int user)
807 {
808 /* Resizes the resolution of the display adapater */
809 int err = 0;
810
811 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
812 err = vc->vc_sw->con_resize(vc, width, height, user);
813
814 return err;
815 }
816
817 /*
818 * Change # of rows and columns (0 means unchanged/the size of fg_console)
819 * [this is to be used together with some user program
820 * like resize that changes the hardware videomode]
821 */
822 #define VC_RESIZE_MAXCOL (32767)
823 #define VC_RESIZE_MAXROW (32767)
824
825 /**
826 * vc_do_resize - resizing method for the tty
827 * @tty: tty being resized
828 * @real_tty: real tty (different to tty if a pty/tty pair)
829 * @vc: virtual console private data
830 * @cols: columns
831 * @lines: lines
832 *
833 * Resize a virtual console, clipping according to the actual constraints.
834 * If the caller passes a tty structure then update the termios winsize
835 * information and perform any necessary signal handling.
836 *
837 * Caller must hold the console semaphore. Takes the termios rwsem and
838 * ctrl_lock of the tty IFF a tty is passed.
839 */
840
841 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
842 unsigned int cols, unsigned int lines)
843 {
844 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
845 unsigned long end;
846 unsigned int old_rows, old_row_size;
847 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
848 unsigned int user;
849 unsigned short *newscreen;
850
851 WARN_CONSOLE_UNLOCKED();
852
853 if (!vc)
854 return -ENXIO;
855
856 user = vc->vc_resize_user;
857 vc->vc_resize_user = 0;
858
859 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
860 return -EINVAL;
861
862 new_cols = (cols ? cols : vc->vc_cols);
863 new_rows = (lines ? lines : vc->vc_rows);
864 new_row_size = new_cols << 1;
865 new_screen_size = new_row_size * new_rows;
866
867 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
868 return 0;
869
870 if (new_screen_size > (4 << 20))
871 return -EINVAL;
872 newscreen = kmalloc(new_screen_size, GFP_USER);
873 if (!newscreen)
874 return -ENOMEM;
875
876 if (vc == sel_cons)
877 clear_selection();
878
879 old_rows = vc->vc_rows;
880 old_row_size = vc->vc_size_row;
881
882 err = resize_screen(vc, new_cols, new_rows, user);
883 if (err) {
884 kfree(newscreen);
885 return err;
886 }
887
888 vc->vc_rows = new_rows;
889 vc->vc_cols = new_cols;
890 vc->vc_size_row = new_row_size;
891 vc->vc_screenbuf_size = new_screen_size;
892
893 rlth = min(old_row_size, new_row_size);
894 rrem = new_row_size - rlth;
895 old_origin = vc->vc_origin;
896 new_origin = (long) newscreen;
897 new_scr_end = new_origin + new_screen_size;
898
899 if (vc->vc_y > new_rows) {
900 if (old_rows - vc->vc_y < new_rows) {
901 /*
902 * Cursor near the bottom, copy contents from the
903 * bottom of buffer
904 */
905 old_origin += (old_rows - new_rows) * old_row_size;
906 } else {
907 /*
908 * Cursor is in no man's land, copy 1/2 screenful
909 * from the top and bottom of cursor position
910 */
911 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
912 }
913 }
914
915 end = old_origin + old_row_size * min(old_rows, new_rows);
916
917 update_attr(vc);
918
919 while (old_origin < end) {
920 scr_memcpyw((unsigned short *) new_origin,
921 (unsigned short *) old_origin, rlth);
922 if (rrem)
923 scr_memsetw((void *)(new_origin + rlth),
924 vc->vc_video_erase_char, rrem);
925 old_origin += old_row_size;
926 new_origin += new_row_size;
927 }
928 if (new_scr_end > new_origin)
929 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
930 new_scr_end - new_origin);
931 kfree(vc->vc_screenbuf);
932 vc->vc_screenbuf = newscreen;
933 vc->vc_screenbuf_size = new_screen_size;
934 set_origin(vc);
935
936 /* do part of a reset_terminal() */
937 vc->vc_top = 0;
938 vc->vc_bottom = vc->vc_rows;
939 gotoxy(vc, vc->vc_x, vc->vc_y);
940 save_cur(vc);
941
942 if (tty) {
943 /* Rewrite the requested winsize data with the actual
944 resulting sizes */
945 struct winsize ws;
946 memset(&ws, 0, sizeof(ws));
947 ws.ws_row = vc->vc_rows;
948 ws.ws_col = vc->vc_cols;
949 ws.ws_ypixel = vc->vc_scan_lines;
950 tty_do_resize(tty, &ws);
951 }
952
953 if (con_is_visible(vc))
954 update_screen(vc);
955 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
956 return err;
957 }
958
959 /**
960 * vc_resize - resize a VT
961 * @vc: virtual console
962 * @cols: columns
963 * @rows: rows
964 *
965 * Resize a virtual console as seen from the console end of things. We
966 * use the common vc_do_resize methods to update the structures. The
967 * caller must hold the console sem to protect console internals and
968 * vc->port.tty
969 */
970
971 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
972 {
973 return vc_do_resize(vc->port.tty, vc, cols, rows);
974 }
975
976 /**
977 * vt_resize - resize a VT
978 * @tty: tty to resize
979 * @ws: winsize attributes
980 *
981 * Resize a virtual terminal. This is called by the tty layer as we
982 * register our own handler for resizing. The mutual helper does all
983 * the actual work.
984 *
985 * Takes the console sem and the called methods then take the tty
986 * termios_rwsem and the tty ctrl_lock in that order.
987 */
988 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
989 {
990 struct vc_data *vc = tty->driver_data;
991 int ret;
992
993 console_lock();
994 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
995 console_unlock();
996 return ret;
997 }
998
999 struct vc_data *vc_deallocate(unsigned int currcons)
1000 {
1001 struct vc_data *vc = NULL;
1002
1003 WARN_CONSOLE_UNLOCKED();
1004
1005 if (vc_cons_allocated(currcons)) {
1006 struct vt_notifier_param param;
1007
1008 param.vc = vc = vc_cons[currcons].d;
1009 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1010 vcs_remove_sysfs(currcons);
1011 vc->vc_sw->con_deinit(vc);
1012 put_pid(vc->vt_pid);
1013 module_put(vc->vc_sw->owner);
1014 kfree(vc->vc_screenbuf);
1015 vc_cons[currcons].d = NULL;
1016 }
1017 return vc;
1018 }
1019
1020 /*
1021 * VT102 emulator
1022 */
1023
1024 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1025 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1026 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1027
1028 #define decarm VC_REPEAT
1029 #define decckm VC_CKMODE
1030 #define kbdapplic VC_APPLIC
1031 #define lnm VC_CRLF
1032
1033 /*
1034 * this is what the terminal answers to a ESC-Z or csi0c query.
1035 */
1036 #define VT100ID "\033[?1;2c"
1037 #define VT102ID "\033[?6c"
1038
1039 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1040 8,12,10,14, 9,13,11,15 };
1041
1042 /* the default colour table, for VGA+ colour systems */
1043 unsigned char default_red[] = {
1044 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1045 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1046 };
1047 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1048
1049 unsigned char default_grn[] = {
1050 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1051 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1052 };
1053 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1054
1055 unsigned char default_blu[] = {
1056 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1057 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1058 };
1059 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1060
1061 /*
1062 * gotoxy() must verify all boundaries, because the arguments
1063 * might also be negative. If the given position is out of
1064 * bounds, the cursor is placed at the nearest margin.
1065 */
1066 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1067 {
1068 int min_y, max_y;
1069
1070 if (new_x < 0)
1071 vc->vc_x = 0;
1072 else {
1073 if (new_x >= vc->vc_cols)
1074 vc->vc_x = vc->vc_cols - 1;
1075 else
1076 vc->vc_x = new_x;
1077 }
1078
1079 if (vc->vc_decom) {
1080 min_y = vc->vc_top;
1081 max_y = vc->vc_bottom;
1082 } else {
1083 min_y = 0;
1084 max_y = vc->vc_rows;
1085 }
1086 if (new_y < min_y)
1087 vc->vc_y = min_y;
1088 else if (new_y >= max_y)
1089 vc->vc_y = max_y - 1;
1090 else
1091 vc->vc_y = new_y;
1092 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1093 vc->vc_need_wrap = 0;
1094 }
1095
1096 /* for absolute user moves, when decom is set */
1097 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1098 {
1099 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1100 }
1101
1102 void scrollback(struct vc_data *vc)
1103 {
1104 scrolldelta(-(vc->vc_rows / 2));
1105 }
1106
1107 void scrollfront(struct vc_data *vc, int lines)
1108 {
1109 if (!lines)
1110 lines = vc->vc_rows / 2;
1111 scrolldelta(lines);
1112 }
1113
1114 static void lf(struct vc_data *vc)
1115 {
1116 /* don't scroll if above bottom of scrolling region, or
1117 * if below scrolling region
1118 */
1119 if (vc->vc_y + 1 == vc->vc_bottom)
1120 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1121 else if (vc->vc_y < vc->vc_rows - 1) {
1122 vc->vc_y++;
1123 vc->vc_pos += vc->vc_size_row;
1124 }
1125 vc->vc_need_wrap = 0;
1126 notify_write(vc, '\n');
1127 }
1128
1129 static void ri(struct vc_data *vc)
1130 {
1131 /* don't scroll if below top of scrolling region, or
1132 * if above scrolling region
1133 */
1134 if (vc->vc_y == vc->vc_top)
1135 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1136 else if (vc->vc_y > 0) {
1137 vc->vc_y--;
1138 vc->vc_pos -= vc->vc_size_row;
1139 }
1140 vc->vc_need_wrap = 0;
1141 }
1142
1143 static inline void cr(struct vc_data *vc)
1144 {
1145 vc->vc_pos -= vc->vc_x << 1;
1146 vc->vc_need_wrap = vc->vc_x = 0;
1147 notify_write(vc, '\r');
1148 }
1149
1150 static inline void bs(struct vc_data *vc)
1151 {
1152 if (vc->vc_x) {
1153 vc->vc_pos -= 2;
1154 vc->vc_x--;
1155 vc->vc_need_wrap = 0;
1156 notify_write(vc, '\b');
1157 }
1158 }
1159
1160 static inline void del(struct vc_data *vc)
1161 {
1162 /* ignored */
1163 }
1164
1165 static void csi_J(struct vc_data *vc, int vpar)
1166 {
1167 unsigned int count;
1168 unsigned short * start;
1169
1170 switch (vpar) {
1171 case 0: /* erase from cursor to end of display */
1172 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1173 start = (unsigned short *)vc->vc_pos;
1174 break;
1175 case 1: /* erase from start to cursor */
1176 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1177 start = (unsigned short *)vc->vc_origin;
1178 break;
1179 case 3: /* erase scroll-back buffer (and whole display) */
1180 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1181 vc->vc_screenbuf_size);
1182 flush_scrollback(vc);
1183 set_origin(vc);
1184 if (con_is_visible(vc))
1185 update_screen(vc);
1186 /* fall through */
1187 case 2: /* erase whole display */
1188 count = vc->vc_cols * vc->vc_rows;
1189 start = (unsigned short *)vc->vc_origin;
1190 break;
1191 default:
1192 return;
1193 }
1194 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1195 if (con_should_update(vc))
1196 do_update_region(vc, (unsigned long) start, count);
1197 vc->vc_need_wrap = 0;
1198 }
1199
1200 static void csi_K(struct vc_data *vc, int vpar)
1201 {
1202 unsigned int count;
1203 unsigned short * start;
1204
1205 switch (vpar) {
1206 case 0: /* erase from cursor to end of line */
1207 count = vc->vc_cols - vc->vc_x;
1208 start = (unsigned short *)vc->vc_pos;
1209 break;
1210 case 1: /* erase from start of line to cursor */
1211 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1212 count = vc->vc_x + 1;
1213 break;
1214 case 2: /* erase whole line */
1215 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1216 count = vc->vc_cols;
1217 break;
1218 default:
1219 return;
1220 }
1221 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1222 vc->vc_need_wrap = 0;
1223 if (con_should_update(vc))
1224 do_update_region(vc, (unsigned long) start, count);
1225 }
1226
1227 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1228 { /* not vt100? */
1229 int count;
1230
1231 if (!vpar)
1232 vpar++;
1233 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1234
1235 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1236 if (con_should_update(vc))
1237 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1238 vc->vc_need_wrap = 0;
1239 }
1240
1241 static void default_attr(struct vc_data *vc)
1242 {
1243 vc->vc_intensity = 1;
1244 vc->vc_italic = 0;
1245 vc->vc_underline = 0;
1246 vc->vc_reverse = 0;
1247 vc->vc_blink = 0;
1248 vc->vc_color = vc->vc_def_color;
1249 }
1250
1251 struct rgb { u8 r; u8 g; u8 b; };
1252
1253 static void rgb_from_256(int i, struct rgb *c)
1254 {
1255 if (i < 8) { /* Standard colours. */
1256 c->r = i&1 ? 0xaa : 0x00;
1257 c->g = i&2 ? 0xaa : 0x00;
1258 c->b = i&4 ? 0xaa : 0x00;
1259 } else if (i < 16) {
1260 c->r = i&1 ? 0xff : 0x55;
1261 c->g = i&2 ? 0xff : 0x55;
1262 c->b = i&4 ? 0xff : 0x55;
1263 } else if (i < 232) { /* 6x6x6 colour cube. */
1264 c->r = (i - 16) / 36 * 85 / 2;
1265 c->g = (i - 16) / 6 % 6 * 85 / 2;
1266 c->b = (i - 16) % 6 * 85 / 2;
1267 } else /* Grayscale ramp. */
1268 c->r = c->g = c->b = i * 10 - 2312;
1269 }
1270
1271 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1272 {
1273 u8 hue = 0, max = max3(c->r, c->g, c->b);
1274
1275 if (c->r > max / 2)
1276 hue |= 4;
1277 if (c->g > max / 2)
1278 hue |= 2;
1279 if (c->b > max / 2)
1280 hue |= 1;
1281
1282 if (hue == 7 && max <= 0x55) {
1283 hue = 0;
1284 vc->vc_intensity = 2;
1285 } else if (max > 0xaa)
1286 vc->vc_intensity = 2;
1287 else
1288 vc->vc_intensity = 1;
1289
1290 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1291 }
1292
1293 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1294 {
1295 /* For backgrounds, err on the dark side. */
1296 vc->vc_color = (vc->vc_color & 0x0f)
1297 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1298 }
1299
1300 /*
1301 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1302 * and thus need to be detected and ignored by hand. Strictly speaking, that
1303 * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1304 * no one produces such codes and almost no one accepts them.
1305 *
1306 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1307 * supporting them.
1308 */
1309 static int vc_t416_color(struct vc_data *vc, int i,
1310 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1311 {
1312 struct rgb c;
1313
1314 i++;
1315 if (i > vc->vc_npar)
1316 return i;
1317
1318 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1319 /* 256 colours */
1320 i++;
1321 rgb_from_256(vc->vc_par[i], &c);
1322 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1323 /* 24 bit */
1324 c.r = vc->vc_par[i + 1];
1325 c.g = vc->vc_par[i + 2];
1326 c.b = vc->vc_par[i + 3];
1327 i += 3;
1328 } else
1329 return i;
1330
1331 set_color(vc, &c);
1332
1333 return i;
1334 }
1335
1336 /* console_lock is held */
1337 static void csi_m(struct vc_data *vc)
1338 {
1339 int i;
1340
1341 for (i = 0; i <= vc->vc_npar; i++)
1342 switch (vc->vc_par[i]) {
1343 case 0: /* all attributes off */
1344 default_attr(vc);
1345 break;
1346 case 1:
1347 vc->vc_intensity = 2;
1348 break;
1349 case 2:
1350 vc->vc_intensity = 0;
1351 break;
1352 case 3:
1353 vc->vc_italic = 1;
1354 break;
1355 case 4:
1356 vc->vc_underline = 1;
1357 break;
1358 case 5:
1359 vc->vc_blink = 1;
1360 break;
1361 case 7:
1362 vc->vc_reverse = 1;
1363 break;
1364 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1365 * Select primary font, don't display control chars if
1366 * defined, don't set bit 8 on output.
1367 */
1368 vc->vc_translate = set_translate(vc->vc_charset == 0
1369 ? vc->vc_G0_charset
1370 : vc->vc_G1_charset, vc);
1371 vc->vc_disp_ctrl = 0;
1372 vc->vc_toggle_meta = 0;
1373 break;
1374 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1375 * Select first alternate font, lets chars < 32 be
1376 * displayed as ROM chars.
1377 */
1378 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1379 vc->vc_disp_ctrl = 1;
1380 vc->vc_toggle_meta = 0;
1381 break;
1382 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1383 * Select second alternate font, toggle high bit
1384 * before displaying as ROM char.
1385 */
1386 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1387 vc->vc_disp_ctrl = 1;
1388 vc->vc_toggle_meta = 1;
1389 break;
1390 case 21:
1391 case 22:
1392 vc->vc_intensity = 1;
1393 break;
1394 case 23:
1395 vc->vc_italic = 0;
1396 break;
1397 case 24:
1398 vc->vc_underline = 0;
1399 break;
1400 case 25:
1401 vc->vc_blink = 0;
1402 break;
1403 case 27:
1404 vc->vc_reverse = 0;
1405 break;
1406 case 38:
1407 i = vc_t416_color(vc, i, rgb_foreground);
1408 break;
1409 case 48:
1410 i = vc_t416_color(vc, i, rgb_background);
1411 break;
1412 case 39:
1413 vc->vc_color = (vc->vc_def_color & 0x0f) |
1414 (vc->vc_color & 0xf0);
1415 break;
1416 case 49:
1417 vc->vc_color = (vc->vc_def_color & 0xf0) |
1418 (vc->vc_color & 0x0f);
1419 break;
1420 default:
1421 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1422 if (vc->vc_par[i] < 100)
1423 vc->vc_intensity = 2;
1424 vc->vc_par[i] -= 60;
1425 }
1426 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1427 vc->vc_color = color_table[vc->vc_par[i] - 30]
1428 | (vc->vc_color & 0xf0);
1429 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1430 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1431 | (vc->vc_color & 0x0f);
1432 break;
1433 }
1434 update_attr(vc);
1435 }
1436
1437 static void respond_string(const char *p, struct tty_port *port)
1438 {
1439 while (*p) {
1440 tty_insert_flip_char(port, *p, 0);
1441 p++;
1442 }
1443 tty_schedule_flip(port);
1444 }
1445
1446 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1447 {
1448 char buf[40];
1449
1450 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1451 respond_string(buf, tty->port);
1452 }
1453
1454 static inline void status_report(struct tty_struct *tty)
1455 {
1456 respond_string("\033[0n", tty->port); /* Terminal ok */
1457 }
1458
1459 static inline void respond_ID(struct tty_struct *tty)
1460 {
1461 respond_string(VT102ID, tty->port);
1462 }
1463
1464 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1465 {
1466 char buf[8];
1467
1468 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1469 (char)('!' + mry));
1470 respond_string(buf, tty->port);
1471 }
1472
1473 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1474 int mouse_reporting(void)
1475 {
1476 return vc_cons[fg_console].d->vc_report_mouse;
1477 }
1478
1479 /* console_lock is held */
1480 static void set_mode(struct vc_data *vc, int on_off)
1481 {
1482 int i;
1483
1484 for (i = 0; i <= vc->vc_npar; i++)
1485 if (vc->vc_ques) {
1486 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1487 case 1: /* Cursor keys send ^[Ox/^[[x */
1488 if (on_off)
1489 set_kbd(vc, decckm);
1490 else
1491 clr_kbd(vc, decckm);
1492 break;
1493 case 3: /* 80/132 mode switch unimplemented */
1494 #if 0
1495 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1496 /* this alone does not suffice; some user mode
1497 utility has to change the hardware regs */
1498 #endif
1499 break;
1500 case 5: /* Inverted screen on/off */
1501 if (vc->vc_decscnm != on_off) {
1502 vc->vc_decscnm = on_off;
1503 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1504 update_attr(vc);
1505 }
1506 break;
1507 case 6: /* Origin relative/absolute */
1508 vc->vc_decom = on_off;
1509 gotoxay(vc, 0, 0);
1510 break;
1511 case 7: /* Autowrap on/off */
1512 vc->vc_decawm = on_off;
1513 break;
1514 case 8: /* Autorepeat on/off */
1515 if (on_off)
1516 set_kbd(vc, decarm);
1517 else
1518 clr_kbd(vc, decarm);
1519 break;
1520 case 9:
1521 vc->vc_report_mouse = on_off ? 1 : 0;
1522 break;
1523 case 25: /* Cursor on/off */
1524 vc->vc_deccm = on_off;
1525 break;
1526 case 1000:
1527 vc->vc_report_mouse = on_off ? 2 : 0;
1528 break;
1529 }
1530 } else {
1531 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1532 case 3: /* Monitor (display ctrls) */
1533 vc->vc_disp_ctrl = on_off;
1534 break;
1535 case 4: /* Insert Mode on/off */
1536 vc->vc_decim = on_off;
1537 break;
1538 case 20: /* Lf, Enter == CrLf/Lf */
1539 if (on_off)
1540 set_kbd(vc, lnm);
1541 else
1542 clr_kbd(vc, lnm);
1543 break;
1544 }
1545 }
1546 }
1547
1548 /* console_lock is held */
1549 static void setterm_command(struct vc_data *vc)
1550 {
1551 switch(vc->vc_par[0]) {
1552 case 1: /* set color for underline mode */
1553 if (vc->vc_can_do_color &&
1554 vc->vc_par[1] < 16) {
1555 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1556 if (vc->vc_underline)
1557 update_attr(vc);
1558 }
1559 break;
1560 case 2: /* set color for half intensity mode */
1561 if (vc->vc_can_do_color &&
1562 vc->vc_par[1] < 16) {
1563 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1564 if (vc->vc_intensity == 0)
1565 update_attr(vc);
1566 }
1567 break;
1568 case 8: /* store colors as defaults */
1569 vc->vc_def_color = vc->vc_attr;
1570 if (vc->vc_hi_font_mask == 0x100)
1571 vc->vc_def_color >>= 1;
1572 default_attr(vc);
1573 update_attr(vc);
1574 break;
1575 case 9: /* set blanking interval */
1576 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1577 poke_blanked_console();
1578 break;
1579 case 10: /* set bell frequency in Hz */
1580 if (vc->vc_npar >= 1)
1581 vc->vc_bell_pitch = vc->vc_par[1];
1582 else
1583 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1584 break;
1585 case 11: /* set bell duration in msec */
1586 if (vc->vc_npar >= 1)
1587 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1588 msecs_to_jiffies(vc->vc_par[1]) : 0;
1589 else
1590 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1591 break;
1592 case 12: /* bring specified console to the front */
1593 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1594 set_console(vc->vc_par[1] - 1);
1595 break;
1596 case 13: /* unblank the screen */
1597 poke_blanked_console();
1598 break;
1599 case 14: /* set vesa powerdown interval */
1600 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1601 break;
1602 case 15: /* activate the previous console */
1603 set_console(last_console);
1604 break;
1605 case 16: /* set cursor blink duration in msec */
1606 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1607 vc->vc_par[1] <= USHRT_MAX)
1608 vc->vc_cur_blink_ms = vc->vc_par[1];
1609 else
1610 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1611 break;
1612 }
1613 }
1614
1615 /* console_lock is held */
1616 static void csi_at(struct vc_data *vc, unsigned int nr)
1617 {
1618 if (nr > vc->vc_cols - vc->vc_x)
1619 nr = vc->vc_cols - vc->vc_x;
1620 else if (!nr)
1621 nr = 1;
1622 insert_char(vc, nr);
1623 }
1624
1625 /* console_lock is held */
1626 static void csi_L(struct vc_data *vc, unsigned int nr)
1627 {
1628 if (nr > vc->vc_rows - vc->vc_y)
1629 nr = vc->vc_rows - vc->vc_y;
1630 else if (!nr)
1631 nr = 1;
1632 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1633 vc->vc_need_wrap = 0;
1634 }
1635
1636 /* console_lock is held */
1637 static void csi_P(struct vc_data *vc, unsigned int nr)
1638 {
1639 if (nr > vc->vc_cols - vc->vc_x)
1640 nr = vc->vc_cols - vc->vc_x;
1641 else if (!nr)
1642 nr = 1;
1643 delete_char(vc, nr);
1644 }
1645
1646 /* console_lock is held */
1647 static void csi_M(struct vc_data *vc, unsigned int nr)
1648 {
1649 if (nr > vc->vc_rows - vc->vc_y)
1650 nr = vc->vc_rows - vc->vc_y;
1651 else if (!nr)
1652 nr=1;
1653 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1654 vc->vc_need_wrap = 0;
1655 }
1656
1657 /* console_lock is held (except via vc_init->reset_terminal */
1658 static void save_cur(struct vc_data *vc)
1659 {
1660 vc->vc_saved_x = vc->vc_x;
1661 vc->vc_saved_y = vc->vc_y;
1662 vc->vc_s_intensity = vc->vc_intensity;
1663 vc->vc_s_italic = vc->vc_italic;
1664 vc->vc_s_underline = vc->vc_underline;
1665 vc->vc_s_blink = vc->vc_blink;
1666 vc->vc_s_reverse = vc->vc_reverse;
1667 vc->vc_s_charset = vc->vc_charset;
1668 vc->vc_s_color = vc->vc_color;
1669 vc->vc_saved_G0 = vc->vc_G0_charset;
1670 vc->vc_saved_G1 = vc->vc_G1_charset;
1671 }
1672
1673 /* console_lock is held */
1674 static void restore_cur(struct vc_data *vc)
1675 {
1676 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1677 vc->vc_intensity = vc->vc_s_intensity;
1678 vc->vc_italic = vc->vc_s_italic;
1679 vc->vc_underline = vc->vc_s_underline;
1680 vc->vc_blink = vc->vc_s_blink;
1681 vc->vc_reverse = vc->vc_s_reverse;
1682 vc->vc_charset = vc->vc_s_charset;
1683 vc->vc_color = vc->vc_s_color;
1684 vc->vc_G0_charset = vc->vc_saved_G0;
1685 vc->vc_G1_charset = vc->vc_saved_G1;
1686 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1687 update_attr(vc);
1688 vc->vc_need_wrap = 0;
1689 }
1690
1691 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1692 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1693 ESpalette, ESosc };
1694
1695 /* console_lock is held (except via vc_init()) */
1696 static void reset_terminal(struct vc_data *vc, int do_clear)
1697 {
1698 vc->vc_top = 0;
1699 vc->vc_bottom = vc->vc_rows;
1700 vc->vc_state = ESnormal;
1701 vc->vc_ques = 0;
1702 vc->vc_translate = set_translate(LAT1_MAP, vc);
1703 vc->vc_G0_charset = LAT1_MAP;
1704 vc->vc_G1_charset = GRAF_MAP;
1705 vc->vc_charset = 0;
1706 vc->vc_need_wrap = 0;
1707 vc->vc_report_mouse = 0;
1708 vc->vc_utf = default_utf8;
1709 vc->vc_utf_count = 0;
1710
1711 vc->vc_disp_ctrl = 0;
1712 vc->vc_toggle_meta = 0;
1713
1714 vc->vc_decscnm = 0;
1715 vc->vc_decom = 0;
1716 vc->vc_decawm = 1;
1717 vc->vc_deccm = global_cursor_default;
1718 vc->vc_decim = 0;
1719
1720 vt_reset_keyboard(vc->vc_num);
1721
1722 vc->vc_cursor_type = cur_default;
1723 vc->vc_complement_mask = vc->vc_s_complement_mask;
1724
1725 default_attr(vc);
1726 update_attr(vc);
1727
1728 vc->vc_tab_stop[0] = 0x01010100;
1729 vc->vc_tab_stop[1] =
1730 vc->vc_tab_stop[2] =
1731 vc->vc_tab_stop[3] =
1732 vc->vc_tab_stop[4] =
1733 vc->vc_tab_stop[5] =
1734 vc->vc_tab_stop[6] =
1735 vc->vc_tab_stop[7] = 0x01010101;
1736
1737 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1738 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1739 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1740
1741 gotoxy(vc, 0, 0);
1742 save_cur(vc);
1743 if (do_clear)
1744 csi_J(vc, 2);
1745 }
1746
1747 /* console_lock is held */
1748 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1749 {
1750 /*
1751 * Control characters can be used in the _middle_
1752 * of an escape sequence.
1753 */
1754 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1755 return;
1756 switch (c) {
1757 case 0:
1758 return;
1759 case 7:
1760 if (vc->vc_state == ESosc)
1761 vc->vc_state = ESnormal;
1762 else if (vc->vc_bell_duration)
1763 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1764 return;
1765 case 8:
1766 bs(vc);
1767 return;
1768 case 9:
1769 vc->vc_pos -= (vc->vc_x << 1);
1770 while (vc->vc_x < vc->vc_cols - 1) {
1771 vc->vc_x++;
1772 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1773 break;
1774 }
1775 vc->vc_pos += (vc->vc_x << 1);
1776 notify_write(vc, '\t');
1777 return;
1778 case 10: case 11: case 12:
1779 lf(vc);
1780 if (!is_kbd(vc, lnm))
1781 return;
1782 case 13:
1783 cr(vc);
1784 return;
1785 case 14:
1786 vc->vc_charset = 1;
1787 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1788 vc->vc_disp_ctrl = 1;
1789 return;
1790 case 15:
1791 vc->vc_charset = 0;
1792 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1793 vc->vc_disp_ctrl = 0;
1794 return;
1795 case 24: case 26:
1796 vc->vc_state = ESnormal;
1797 return;
1798 case 27:
1799 vc->vc_state = ESesc;
1800 return;
1801 case 127:
1802 del(vc);
1803 return;
1804 case 128+27:
1805 vc->vc_state = ESsquare;
1806 return;
1807 }
1808 switch(vc->vc_state) {
1809 case ESesc:
1810 vc->vc_state = ESnormal;
1811 switch (c) {
1812 case '[':
1813 vc->vc_state = ESsquare;
1814 return;
1815 case ']':
1816 vc->vc_state = ESnonstd;
1817 return;
1818 case '%':
1819 vc->vc_state = ESpercent;
1820 return;
1821 case 'E':
1822 cr(vc);
1823 lf(vc);
1824 return;
1825 case 'M':
1826 ri(vc);
1827 return;
1828 case 'D':
1829 lf(vc);
1830 return;
1831 case 'H':
1832 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1833 return;
1834 case 'Z':
1835 respond_ID(tty);
1836 return;
1837 case '7':
1838 save_cur(vc);
1839 return;
1840 case '8':
1841 restore_cur(vc);
1842 return;
1843 case '(':
1844 vc->vc_state = ESsetG0;
1845 return;
1846 case ')':
1847 vc->vc_state = ESsetG1;
1848 return;
1849 case '#':
1850 vc->vc_state = EShash;
1851 return;
1852 case 'c':
1853 reset_terminal(vc, 1);
1854 return;
1855 case '>': /* Numeric keypad */
1856 clr_kbd(vc, kbdapplic);
1857 return;
1858 case '=': /* Appl. keypad */
1859 set_kbd(vc, kbdapplic);
1860 return;
1861 }
1862 return;
1863 case ESnonstd:
1864 if (c=='P') { /* palette escape sequence */
1865 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1866 vc->vc_par[vc->vc_npar] = 0;
1867 vc->vc_npar = 0;
1868 vc->vc_state = ESpalette;
1869 return;
1870 } else if (c=='R') { /* reset palette */
1871 reset_palette(vc);
1872 vc->vc_state = ESnormal;
1873 } else if (c>='0' && c<='9')
1874 vc->vc_state = ESosc;
1875 else
1876 vc->vc_state = ESnormal;
1877 return;
1878 case ESpalette:
1879 if (isxdigit(c)) {
1880 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1881 if (vc->vc_npar == 7) {
1882 int i = vc->vc_par[0] * 3, j = 1;
1883 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1884 vc->vc_palette[i++] += vc->vc_par[j++];
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 set_palette(vc);
1890 vc->vc_state = ESnormal;
1891 }
1892 } else
1893 vc->vc_state = ESnormal;
1894 return;
1895 case ESsquare:
1896 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1897 vc->vc_par[vc->vc_npar] = 0;
1898 vc->vc_npar = 0;
1899 vc->vc_state = ESgetpars;
1900 if (c == '[') { /* Function key */
1901 vc->vc_state=ESfunckey;
1902 return;
1903 }
1904 vc->vc_ques = (c == '?');
1905 if (vc->vc_ques)
1906 return;
1907 case ESgetpars:
1908 if (c == ';' && vc->vc_npar < NPAR - 1) {
1909 vc->vc_npar++;
1910 return;
1911 } else if (c>='0' && c<='9') {
1912 vc->vc_par[vc->vc_npar] *= 10;
1913 vc->vc_par[vc->vc_npar] += c - '0';
1914 return;
1915 }
1916 vc->vc_state = ESnormal;
1917 switch(c) {
1918 case 'h':
1919 set_mode(vc, 1);
1920 return;
1921 case 'l':
1922 set_mode(vc, 0);
1923 return;
1924 case 'c':
1925 if (vc->vc_ques) {
1926 if (vc->vc_par[0])
1927 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1928 else
1929 vc->vc_cursor_type = cur_default;
1930 return;
1931 }
1932 break;
1933 case 'm':
1934 if (vc->vc_ques) {
1935 clear_selection();
1936 if (vc->vc_par[0])
1937 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1938 else
1939 vc->vc_complement_mask = vc->vc_s_complement_mask;
1940 return;
1941 }
1942 break;
1943 case 'n':
1944 if (!vc->vc_ques) {
1945 if (vc->vc_par[0] == 5)
1946 status_report(tty);
1947 else if (vc->vc_par[0] == 6)
1948 cursor_report(vc, tty);
1949 }
1950 return;
1951 }
1952 if (vc->vc_ques) {
1953 vc->vc_ques = 0;
1954 return;
1955 }
1956 switch(c) {
1957 case 'G': case '`':
1958 if (vc->vc_par[0])
1959 vc->vc_par[0]--;
1960 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1961 return;
1962 case 'A':
1963 if (!vc->vc_par[0])
1964 vc->vc_par[0]++;
1965 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1966 return;
1967 case 'B': case 'e':
1968 if (!vc->vc_par[0])
1969 vc->vc_par[0]++;
1970 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1971 return;
1972 case 'C': case 'a':
1973 if (!vc->vc_par[0])
1974 vc->vc_par[0]++;
1975 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1976 return;
1977 case 'D':
1978 if (!vc->vc_par[0])
1979 vc->vc_par[0]++;
1980 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1981 return;
1982 case 'E':
1983 if (!vc->vc_par[0])
1984 vc->vc_par[0]++;
1985 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1986 return;
1987 case 'F':
1988 if (!vc->vc_par[0])
1989 vc->vc_par[0]++;
1990 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1991 return;
1992 case 'd':
1993 if (vc->vc_par[0])
1994 vc->vc_par[0]--;
1995 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1996 return;
1997 case 'H': case 'f':
1998 if (vc->vc_par[0])
1999 vc->vc_par[0]--;
2000 if (vc->vc_par[1])
2001 vc->vc_par[1]--;
2002 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2003 return;
2004 case 'J':
2005 csi_J(vc, vc->vc_par[0]);
2006 return;
2007 case 'K':
2008 csi_K(vc, vc->vc_par[0]);
2009 return;
2010 case 'L':
2011 csi_L(vc, vc->vc_par[0]);
2012 return;
2013 case 'M':
2014 csi_M(vc, vc->vc_par[0]);
2015 return;
2016 case 'P':
2017 csi_P(vc, vc->vc_par[0]);
2018 return;
2019 case 'c':
2020 if (!vc->vc_par[0])
2021 respond_ID(tty);
2022 return;
2023 case 'g':
2024 if (!vc->vc_par[0])
2025 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2026 else if (vc->vc_par[0] == 3) {
2027 vc->vc_tab_stop[0] =
2028 vc->vc_tab_stop[1] =
2029 vc->vc_tab_stop[2] =
2030 vc->vc_tab_stop[3] =
2031 vc->vc_tab_stop[4] =
2032 vc->vc_tab_stop[5] =
2033 vc->vc_tab_stop[6] =
2034 vc->vc_tab_stop[7] = 0;
2035 }
2036 return;
2037 case 'm':
2038 csi_m(vc);
2039 return;
2040 case 'q': /* DECLL - but only 3 leds */
2041 /* map 0,1,2,3 to 0,1,2,4 */
2042 if (vc->vc_par[0] < 4)
2043 vt_set_led_state(vc->vc_num,
2044 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2045 return;
2046 case 'r':
2047 if (!vc->vc_par[0])
2048 vc->vc_par[0]++;
2049 if (!vc->vc_par[1])
2050 vc->vc_par[1] = vc->vc_rows;
2051 /* Minimum allowed region is 2 lines */
2052 if (vc->vc_par[0] < vc->vc_par[1] &&
2053 vc->vc_par[1] <= vc->vc_rows) {
2054 vc->vc_top = vc->vc_par[0] - 1;
2055 vc->vc_bottom = vc->vc_par[1];
2056 gotoxay(vc, 0, 0);
2057 }
2058 return;
2059 case 's':
2060 save_cur(vc);
2061 return;
2062 case 'u':
2063 restore_cur(vc);
2064 return;
2065 case 'X':
2066 csi_X(vc, vc->vc_par[0]);
2067 return;
2068 case '@':
2069 csi_at(vc, vc->vc_par[0]);
2070 return;
2071 case ']': /* setterm functions */
2072 setterm_command(vc);
2073 return;
2074 }
2075 return;
2076 case ESpercent:
2077 vc->vc_state = ESnormal;
2078 switch (c) {
2079 case '@': /* defined in ISO 2022 */
2080 vc->vc_utf = 0;
2081 return;
2082 case 'G': /* prelim official escape code */
2083 case '8': /* retained for compatibility */
2084 vc->vc_utf = 1;
2085 return;
2086 }
2087 return;
2088 case ESfunckey:
2089 vc->vc_state = ESnormal;
2090 return;
2091 case EShash:
2092 vc->vc_state = ESnormal;
2093 if (c == '8') {
2094 /* DEC screen alignment test. kludge :-) */
2095 vc->vc_video_erase_char =
2096 (vc->vc_video_erase_char & 0xff00) | 'E';
2097 csi_J(vc, 2);
2098 vc->vc_video_erase_char =
2099 (vc->vc_video_erase_char & 0xff00) | ' ';
2100 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2101 }
2102 return;
2103 case ESsetG0:
2104 if (c == '0')
2105 vc->vc_G0_charset = GRAF_MAP;
2106 else if (c == 'B')
2107 vc->vc_G0_charset = LAT1_MAP;
2108 else if (c == 'U')
2109 vc->vc_G0_charset = IBMPC_MAP;
2110 else if (c == 'K')
2111 vc->vc_G0_charset = USER_MAP;
2112 if (vc->vc_charset == 0)
2113 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2114 vc->vc_state = ESnormal;
2115 return;
2116 case ESsetG1:
2117 if (c == '0')
2118 vc->vc_G1_charset = GRAF_MAP;
2119 else if (c == 'B')
2120 vc->vc_G1_charset = LAT1_MAP;
2121 else if (c == 'U')
2122 vc->vc_G1_charset = IBMPC_MAP;
2123 else if (c == 'K')
2124 vc->vc_G1_charset = USER_MAP;
2125 if (vc->vc_charset == 1)
2126 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2127 vc->vc_state = ESnormal;
2128 return;
2129 case ESosc:
2130 return;
2131 default:
2132 vc->vc_state = ESnormal;
2133 }
2134 }
2135
2136 /* is_double_width() is based on the wcwidth() implementation by
2137 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2138 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2139 */
2140 struct interval {
2141 uint32_t first;
2142 uint32_t last;
2143 };
2144
2145 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2146 {
2147 int min = 0;
2148 int mid;
2149
2150 if (ucs < table[0].first || ucs > table[max].last)
2151 return 0;
2152 while (max >= min) {
2153 mid = (min + max) / 2;
2154 if (ucs > table[mid].last)
2155 min = mid + 1;
2156 else if (ucs < table[mid].first)
2157 max = mid - 1;
2158 else
2159 return 1;
2160 }
2161 return 0;
2162 }
2163
2164 static int is_double_width(uint32_t ucs)
2165 {
2166 static const struct interval double_width[] = {
2167 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2168 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2169 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2170 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2171 };
2172 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2173 }
2174
2175 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2176 unsigned long draw_to, int *draw_x)
2177 {
2178 if (*draw_x < 0)
2179 return;
2180
2181 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2182 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2183 *draw_x = -1;
2184 }
2185
2186 /* acquires console_lock */
2187 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2188 {
2189 int c, tc, ok, n = 0, draw_x = -1;
2190 unsigned int currcons;
2191 unsigned long draw_from = 0, draw_to = 0;
2192 struct vc_data *vc;
2193 unsigned char vc_attr;
2194 struct vt_notifier_param param;
2195 uint8_t rescan;
2196 uint8_t inverse;
2197 uint8_t width;
2198 u16 himask, charmask;
2199
2200 if (in_interrupt())
2201 return count;
2202
2203 might_sleep();
2204
2205 console_lock();
2206 vc = tty->driver_data;
2207 if (vc == NULL) {
2208 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2209 console_unlock();
2210 return 0;
2211 }
2212
2213 currcons = vc->vc_num;
2214 if (!vc_cons_allocated(currcons)) {
2215 /* could this happen? */
2216 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2217 console_unlock();
2218 return 0;
2219 }
2220
2221 himask = vc->vc_hi_font_mask;
2222 charmask = himask ? 0x1ff : 0xff;
2223
2224 /* undraw cursor first */
2225 if (con_is_fg(vc))
2226 hide_cursor(vc);
2227
2228 param.vc = vc;
2229
2230 while (!tty->stopped && count) {
2231 int orig = *buf;
2232 c = orig;
2233 buf++;
2234 n++;
2235 count--;
2236 rescan = 0;
2237 inverse = 0;
2238 width = 1;
2239
2240 /* Do no translation at all in control states */
2241 if (vc->vc_state != ESnormal) {
2242 tc = c;
2243 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2244 /* Combine UTF-8 into Unicode in vc_utf_char.
2245 * vc_utf_count is the number of continuation bytes still
2246 * expected to arrive.
2247 * vc_npar is the number of continuation bytes arrived so
2248 * far
2249 */
2250 rescan_last_byte:
2251 if ((c & 0xc0) == 0x80) {
2252 /* Continuation byte received */
2253 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2254 if (vc->vc_utf_count) {
2255 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2256 vc->vc_npar++;
2257 if (--vc->vc_utf_count) {
2258 /* Still need some bytes */
2259 continue;
2260 }
2261 /* Got a whole character */
2262 c = vc->vc_utf_char;
2263 /* Reject overlong sequences */
2264 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2265 c > utf8_length_changes[vc->vc_npar])
2266 c = 0xfffd;
2267 } else {
2268 /* Unexpected continuation byte */
2269 vc->vc_utf_count = 0;
2270 c = 0xfffd;
2271 }
2272 } else {
2273 /* Single ASCII byte or first byte of a sequence received */
2274 if (vc->vc_utf_count) {
2275 /* Continuation byte expected */
2276 rescan = 1;
2277 vc->vc_utf_count = 0;
2278 c = 0xfffd;
2279 } else if (c > 0x7f) {
2280 /* First byte of a multibyte sequence received */
2281 vc->vc_npar = 0;
2282 if ((c & 0xe0) == 0xc0) {
2283 vc->vc_utf_count = 1;
2284 vc->vc_utf_char = (c & 0x1f);
2285 } else if ((c & 0xf0) == 0xe0) {
2286 vc->vc_utf_count = 2;
2287 vc->vc_utf_char = (c & 0x0f);
2288 } else if ((c & 0xf8) == 0xf0) {
2289 vc->vc_utf_count = 3;
2290 vc->vc_utf_char = (c & 0x07);
2291 } else if ((c & 0xfc) == 0xf8) {
2292 vc->vc_utf_count = 4;
2293 vc->vc_utf_char = (c & 0x03);
2294 } else if ((c & 0xfe) == 0xfc) {
2295 vc->vc_utf_count = 5;
2296 vc->vc_utf_char = (c & 0x01);
2297 } else {
2298 /* 254 and 255 are invalid */
2299 c = 0xfffd;
2300 }
2301 if (vc->vc_utf_count) {
2302 /* Still need some bytes */
2303 continue;
2304 }
2305 }
2306 /* Nothing to do if an ASCII byte was received */
2307 }
2308 /* End of UTF-8 decoding. */
2309 /* c is the received character, or U+FFFD for invalid sequences. */
2310 /* Replace invalid Unicode code points with U+FFFD too */
2311 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2312 c = 0xfffd;
2313 tc = c;
2314 } else { /* no utf or alternate charset mode */
2315 tc = vc_translate(vc, c);
2316 }
2317
2318 param.c = tc;
2319 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2320 &param) == NOTIFY_STOP)
2321 continue;
2322
2323 /* If the original code was a control character we
2324 * only allow a glyph to be displayed if the code is
2325 * not normally used (such as for cursor movement) or
2326 * if the disp_ctrl mode has been explicitly enabled.
2327 * Certain characters (as given by the CTRL_ALWAYS
2328 * bitmap) are always displayed as control characters,
2329 * as the console would be pretty useless without
2330 * them; to display an arbitrary font position use the
2331 * direct-to-font zone in UTF-8 mode.
2332 */
2333 ok = tc && (c >= 32 ||
2334 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2335 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2336 && (c != 127 || vc->vc_disp_ctrl)
2337 && (c != 128+27);
2338
2339 if (vc->vc_state == ESnormal && ok) {
2340 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2341 if (is_double_width(c))
2342 width = 2;
2343 }
2344 /* Now try to find out how to display it */
2345 tc = conv_uni_to_pc(vc, tc);
2346 if (tc & ~charmask) {
2347 if (tc == -1 || tc == -2) {
2348 continue; /* nothing to display */
2349 }
2350 /* Glyph not found */
2351 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2352 /* In legacy mode use the glyph we get by a 1:1 mapping.
2353 This would make absolutely no sense with Unicode in mind,
2354 but do this for ASCII characters since a font may lack
2355 Unicode mapping info and we don't want to end up with
2356 having question marks only. */
2357 tc = c;
2358 } else {
2359 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2360 tc = conv_uni_to_pc(vc, 0xfffd);
2361 if (tc < 0) {
2362 inverse = 1;
2363 tc = conv_uni_to_pc(vc, '?');
2364 if (tc < 0) tc = '?';
2365 }
2366 }
2367 }
2368
2369 if (!inverse) {
2370 vc_attr = vc->vc_attr;
2371 } else {
2372 /* invert vc_attr */
2373 if (!vc->vc_can_do_color) {
2374 vc_attr = (vc->vc_attr) ^ 0x08;
2375 } else if (vc->vc_hi_font_mask == 0x100) {
2376 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2377 } else {
2378 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2379 }
2380 con_flush(vc, draw_from, draw_to, &draw_x);
2381 }
2382
2383 while (1) {
2384 if (vc->vc_need_wrap || vc->vc_decim)
2385 con_flush(vc, draw_from, draw_to,
2386 &draw_x);
2387 if (vc->vc_need_wrap) {
2388 cr(vc);
2389 lf(vc);
2390 }
2391 if (vc->vc_decim)
2392 insert_char(vc, 1);
2393 scr_writew(himask ?
2394 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2395 (vc_attr << 8) + tc,
2396 (u16 *) vc->vc_pos);
2397 if (con_should_update(vc) && draw_x < 0) {
2398 draw_x = vc->vc_x;
2399 draw_from = vc->vc_pos;
2400 }
2401 if (vc->vc_x == vc->vc_cols - 1) {
2402 vc->vc_need_wrap = vc->vc_decawm;
2403 draw_to = vc->vc_pos + 2;
2404 } else {
2405 vc->vc_x++;
2406 draw_to = (vc->vc_pos += 2);
2407 }
2408
2409 if (!--width) break;
2410
2411 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2412 if (tc < 0) tc = ' ';
2413 }
2414 notify_write(vc, c);
2415
2416 if (inverse)
2417 con_flush(vc, draw_from, draw_to, &draw_x);
2418
2419 if (rescan) {
2420 rescan = 0;
2421 inverse = 0;
2422 width = 1;
2423 c = orig;
2424 goto rescan_last_byte;
2425 }
2426 continue;
2427 }
2428 con_flush(vc, draw_from, draw_to, &draw_x);
2429 do_con_trol(tty, vc, orig);
2430 }
2431 con_flush(vc, draw_from, draw_to, &draw_x);
2432 console_conditional_schedule();
2433 console_unlock();
2434 notify_update(vc);
2435 return n;
2436 }
2437
2438 /*
2439 * This is the console switching callback.
2440 *
2441 * Doing console switching in a process context allows
2442 * us to do the switches asynchronously (needed when we want
2443 * to switch due to a keyboard interrupt). Synchronization
2444 * with other console code and prevention of re-entrancy is
2445 * ensured with console_lock.
2446 */
2447 static void console_callback(struct work_struct *ignored)
2448 {
2449 console_lock();
2450
2451 if (want_console >= 0) {
2452 if (want_console != fg_console &&
2453 vc_cons_allocated(want_console)) {
2454 hide_cursor(vc_cons[fg_console].d);
2455 change_console(vc_cons[want_console].d);
2456 /* we only changed when the console had already
2457 been allocated - a new console is not created
2458 in an interrupt routine */
2459 }
2460 want_console = -1;
2461 }
2462 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2463 do_poke_blanked_console = 0;
2464 poke_blanked_console();
2465 }
2466 if (scrollback_delta) {
2467 struct vc_data *vc = vc_cons[fg_console].d;
2468 clear_selection();
2469 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2470 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2471 scrollback_delta = 0;
2472 }
2473 if (blank_timer_expired) {
2474 do_blank_screen(0);
2475 blank_timer_expired = 0;
2476 }
2477 notify_update(vc_cons[fg_console].d);
2478
2479 console_unlock();
2480 }
2481
2482 int set_console(int nr)
2483 {
2484 struct vc_data *vc = vc_cons[fg_console].d;
2485
2486 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2487 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2488
2489 /*
2490 * Console switch will fail in console_callback() or
2491 * change_console() so there is no point scheduling
2492 * the callback
2493 *
2494 * Existing set_console() users don't check the return
2495 * value so this shouldn't break anything
2496 */
2497 return -EINVAL;
2498 }
2499
2500 want_console = nr;
2501 schedule_console_callback();
2502
2503 return 0;
2504 }
2505
2506 struct tty_driver *console_driver;
2507
2508 #ifdef CONFIG_VT_CONSOLE
2509
2510 /**
2511 * vt_kmsg_redirect() - Sets/gets the kernel message console
2512 * @new: The new virtual terminal number or -1 if the console should stay
2513 * unchanged
2514 *
2515 * By default, the kernel messages are always printed on the current virtual
2516 * console. However, the user may modify that default with the
2517 * TIOCL_SETKMSGREDIRECT ioctl call.
2518 *
2519 * This function sets the kernel message console to be @new. It returns the old
2520 * virtual console number. The virtual terminal number 0 (both as parameter and
2521 * return value) means no redirection (i.e. always printed on the currently
2522 * active console).
2523 *
2524 * The parameter -1 means that only the current console is returned, but the
2525 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2526 * case to make the code more understandable.
2527 *
2528 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2529 * the parameter and always returns 0.
2530 */
2531 int vt_kmsg_redirect(int new)
2532 {
2533 static int kmsg_con;
2534
2535 if (new != -1)
2536 return xchg(&kmsg_con, new);
2537 else
2538 return kmsg_con;
2539 }
2540
2541 /*
2542 * Console on virtual terminal
2543 *
2544 * The console must be locked when we get here.
2545 */
2546
2547 static void vt_console_print(struct console *co, const char *b, unsigned count)
2548 {
2549 struct vc_data *vc = vc_cons[fg_console].d;
2550 unsigned char c;
2551 static DEFINE_SPINLOCK(printing_lock);
2552 const ushort *start;
2553 ushort cnt = 0;
2554 ushort myx;
2555 int kmsg_console;
2556
2557 /* console busy or not yet initialized */
2558 if (!printable)
2559 return;
2560 if (!spin_trylock(&printing_lock))
2561 return;
2562
2563 kmsg_console = vt_get_kmsg_redirect();
2564 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2565 vc = vc_cons[kmsg_console - 1].d;
2566
2567 /* read `x' only after setting currcons properly (otherwise
2568 the `x' macro will read the x of the foreground console). */
2569 myx = vc->vc_x;
2570
2571 if (!vc_cons_allocated(fg_console)) {
2572 /* impossible */
2573 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2574 goto quit;
2575 }
2576
2577 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2578 goto quit;
2579
2580 /* undraw cursor first */
2581 if (con_is_fg(vc))
2582 hide_cursor(vc);
2583
2584 start = (ushort *)vc->vc_pos;
2585
2586 /* Contrived structure to try to emulate original need_wrap behaviour
2587 * Problems caused when we have need_wrap set on '\n' character */
2588 while (count--) {
2589 c = *b++;
2590 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2591 if (cnt > 0) {
2592 if (con_is_visible(vc))
2593 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2594 vc->vc_x += cnt;
2595 if (vc->vc_need_wrap)
2596 vc->vc_x--;
2597 cnt = 0;
2598 }
2599 if (c == 8) { /* backspace */
2600 bs(vc);
2601 start = (ushort *)vc->vc_pos;
2602 myx = vc->vc_x;
2603 continue;
2604 }
2605 if (c != 13)
2606 lf(vc);
2607 cr(vc);
2608 start = (ushort *)vc->vc_pos;
2609 myx = vc->vc_x;
2610 if (c == 10 || c == 13)
2611 continue;
2612 }
2613 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2614 notify_write(vc, c);
2615 cnt++;
2616 if (myx == vc->vc_cols - 1) {
2617 vc->vc_need_wrap = 1;
2618 continue;
2619 }
2620 vc->vc_pos += 2;
2621 myx++;
2622 }
2623 if (cnt > 0) {
2624 if (con_is_visible(vc))
2625 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2626 vc->vc_x += cnt;
2627 if (vc->vc_x == vc->vc_cols) {
2628 vc->vc_x--;
2629 vc->vc_need_wrap = 1;
2630 }
2631 }
2632 set_cursor(vc);
2633 notify_update(vc);
2634
2635 quit:
2636 spin_unlock(&printing_lock);
2637 }
2638
2639 static struct tty_driver *vt_console_device(struct console *c, int *index)
2640 {
2641 *index = c->index ? c->index-1 : fg_console;
2642 return console_driver;
2643 }
2644
2645 static struct console vt_console_driver = {
2646 .name = "tty",
2647 .write = vt_console_print,
2648 .device = vt_console_device,
2649 .unblank = unblank_screen,
2650 .flags = CON_PRINTBUFFER,
2651 .index = -1,
2652 };
2653 #endif
2654
2655 /*
2656 * Handling of Linux-specific VC ioctls
2657 */
2658
2659 /*
2660 * Generally a bit racy with respect to console_lock();.
2661 *
2662 * There are some functions which don't need it.
2663 *
2664 * There are some functions which can sleep for arbitrary periods
2665 * (paste_selection) but we don't need the lock there anyway.
2666 *
2667 * set_selection has locking, and definitely needs it
2668 */
2669
2670 int tioclinux(struct tty_struct *tty, unsigned long arg)
2671 {
2672 char type, data;
2673 char __user *p = (char __user *)arg;
2674 int lines;
2675 int ret;
2676
2677 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2678 return -EPERM;
2679 if (get_user(type, p))
2680 return -EFAULT;
2681 ret = 0;
2682
2683 switch (type)
2684 {
2685 case TIOCL_SETSEL:
2686 console_lock();
2687 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2688 console_unlock();
2689 break;
2690 case TIOCL_PASTESEL:
2691 ret = paste_selection(tty);
2692 break;
2693 case TIOCL_UNBLANKSCREEN:
2694 console_lock();
2695 unblank_screen();
2696 console_unlock();
2697 break;
2698 case TIOCL_SELLOADLUT:
2699 console_lock();
2700 ret = sel_loadlut(p);
2701 console_unlock();
2702 break;
2703 case TIOCL_GETSHIFTSTATE:
2704
2705 /*
2706 * Make it possible to react to Shift+Mousebutton.
2707 * Note that 'shift_state' is an undocumented
2708 * kernel-internal variable; programs not closely
2709 * related to the kernel should not use this.
2710 */
2711 data = vt_get_shift_state();
2712 ret = put_user(data, p);
2713 break;
2714 case TIOCL_GETMOUSEREPORTING:
2715 console_lock(); /* May be overkill */
2716 data = mouse_reporting();
2717 console_unlock();
2718 ret = put_user(data, p);
2719 break;
2720 case TIOCL_SETVESABLANK:
2721 console_lock();
2722 ret = set_vesa_blanking(p);
2723 console_unlock();
2724 break;
2725 case TIOCL_GETKMSGREDIRECT:
2726 data = vt_get_kmsg_redirect();
2727 ret = put_user(data, p);
2728 break;
2729 case TIOCL_SETKMSGREDIRECT:
2730 if (!capable(CAP_SYS_ADMIN)) {
2731 ret = -EPERM;
2732 } else {
2733 if (get_user(data, p+1))
2734 ret = -EFAULT;
2735 else
2736 vt_kmsg_redirect(data);
2737 }
2738 break;
2739 case TIOCL_GETFGCONSOLE:
2740 /* No locking needed as this is a transiently
2741 correct return anyway if the caller hasn't
2742 disabled switching */
2743 ret = fg_console;
2744 break;
2745 case TIOCL_SCROLLCONSOLE:
2746 if (get_user(lines, (s32 __user *)(p+4))) {
2747 ret = -EFAULT;
2748 } else {
2749 /* Need the console lock here. Note that lots
2750 of other calls need fixing before the lock
2751 is actually useful ! */
2752 console_lock();
2753 scrollfront(vc_cons[fg_console].d, lines);
2754 console_unlock();
2755 ret = 0;
2756 }
2757 break;
2758 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2759 console_lock();
2760 ignore_poke = 1;
2761 do_blank_screen(0);
2762 console_unlock();
2763 break;
2764 case TIOCL_BLANKEDSCREEN:
2765 ret = console_blanked;
2766 break;
2767 default:
2768 ret = -EINVAL;
2769 break;
2770 }
2771 return ret;
2772 }
2773
2774 /*
2775 * /dev/ttyN handling
2776 */
2777
2778 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2779 {
2780 int retval;
2781
2782 retval = do_con_write(tty, buf, count);
2783 con_flush_chars(tty);
2784
2785 return retval;
2786 }
2787
2788 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2789 {
2790 if (in_interrupt())
2791 return 0; /* n_r3964 calls put_char() from interrupt context */
2792 return do_con_write(tty, &ch, 1);
2793 }
2794
2795 static int con_write_room(struct tty_struct *tty)
2796 {
2797 if (tty->stopped)
2798 return 0;
2799 return 32768; /* No limit, really; we're not buffering */
2800 }
2801
2802 static int con_chars_in_buffer(struct tty_struct *tty)
2803 {
2804 return 0; /* we're not buffering */
2805 }
2806
2807 /*
2808 * con_throttle and con_unthrottle are only used for
2809 * paste_selection(), which has to stuff in a large number of
2810 * characters...
2811 */
2812 static void con_throttle(struct tty_struct *tty)
2813 {
2814 }
2815
2816 static void con_unthrottle(struct tty_struct *tty)
2817 {
2818 struct vc_data *vc = tty->driver_data;
2819
2820 wake_up_interruptible(&vc->paste_wait);
2821 }
2822
2823 /*
2824 * Turn the Scroll-Lock LED on when the tty is stopped
2825 */
2826 static void con_stop(struct tty_struct *tty)
2827 {
2828 int console_num;
2829 if (!tty)
2830 return;
2831 console_num = tty->index;
2832 if (!vc_cons_allocated(console_num))
2833 return;
2834 vt_kbd_con_stop(console_num);
2835 }
2836
2837 /*
2838 * Turn the Scroll-Lock LED off when the console is started
2839 */
2840 static void con_start(struct tty_struct *tty)
2841 {
2842 int console_num;
2843 if (!tty)
2844 return;
2845 console_num = tty->index;
2846 if (!vc_cons_allocated(console_num))
2847 return;
2848 vt_kbd_con_start(console_num);
2849 }
2850
2851 static void con_flush_chars(struct tty_struct *tty)
2852 {
2853 struct vc_data *vc;
2854
2855 if (in_interrupt()) /* from flush_to_ldisc */
2856 return;
2857
2858 /* if we race with con_close(), vt may be null */
2859 console_lock();
2860 vc = tty->driver_data;
2861 if (vc)
2862 set_cursor(vc);
2863 console_unlock();
2864 }
2865
2866 /*
2867 * Allocate the console screen memory.
2868 */
2869 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2870 {
2871 unsigned int currcons = tty->index;
2872 struct vc_data *vc;
2873 int ret;
2874
2875 console_lock();
2876 ret = vc_allocate(currcons);
2877 if (ret)
2878 goto unlock;
2879
2880 vc = vc_cons[currcons].d;
2881
2882 /* Still being freed */
2883 if (vc->port.tty) {
2884 ret = -ERESTARTSYS;
2885 goto unlock;
2886 }
2887
2888 ret = tty_port_install(&vc->port, driver, tty);
2889 if (ret)
2890 goto unlock;
2891
2892 tty->driver_data = vc;
2893 vc->port.tty = tty;
2894
2895 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2896 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2897 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2898 }
2899 if (vc->vc_utf)
2900 tty->termios.c_iflag |= IUTF8;
2901 else
2902 tty->termios.c_iflag &= ~IUTF8;
2903 unlock:
2904 console_unlock();
2905 return ret;
2906 }
2907
2908 static int con_open(struct tty_struct *tty, struct file *filp)
2909 {
2910 /* everything done in install */
2911 return 0;
2912 }
2913
2914
2915 static void con_close(struct tty_struct *tty, struct file *filp)
2916 {
2917 /* Nothing to do - we defer to shutdown */
2918 }
2919
2920 static void con_shutdown(struct tty_struct *tty)
2921 {
2922 struct vc_data *vc = tty->driver_data;
2923 BUG_ON(vc == NULL);
2924 console_lock();
2925 vc->port.tty = NULL;
2926 console_unlock();
2927 }
2928
2929 static int default_color = 7; /* white */
2930 static int default_italic_color = 2; // green (ASCII)
2931 static int default_underline_color = 3; // cyan (ASCII)
2932 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2933 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2934 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2935
2936 static void vc_init(struct vc_data *vc, unsigned int rows,
2937 unsigned int cols, int do_clear)
2938 {
2939 int j, k ;
2940
2941 vc->vc_cols = cols;
2942 vc->vc_rows = rows;
2943 vc->vc_size_row = cols << 1;
2944 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2945
2946 set_origin(vc);
2947 vc->vc_pos = vc->vc_origin;
2948 reset_vc(vc);
2949 for (j=k=0; j<16; j++) {
2950 vc->vc_palette[k++] = default_red[j] ;
2951 vc->vc_palette[k++] = default_grn[j] ;
2952 vc->vc_palette[k++] = default_blu[j] ;
2953 }
2954 vc->vc_def_color = default_color;
2955 vc->vc_ulcolor = default_underline_color;
2956 vc->vc_itcolor = default_italic_color;
2957 vc->vc_halfcolor = 0x08; /* grey */
2958 init_waitqueue_head(&vc->paste_wait);
2959 reset_terminal(vc, do_clear);
2960 }
2961
2962 /*
2963 * This routine initializes console interrupts, and does nothing
2964 * else. If you want the screen to clear, call tty_write with
2965 * the appropriate escape-sequence.
2966 */
2967
2968 static int __init con_init(void)
2969 {
2970 const char *display_desc = NULL;
2971 struct vc_data *vc;
2972 unsigned int currcons = 0, i;
2973
2974 console_lock();
2975
2976 if (conswitchp)
2977 display_desc = conswitchp->con_startup();
2978 if (!display_desc) {
2979 fg_console = 0;
2980 console_unlock();
2981 return 0;
2982 }
2983
2984 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2985 struct con_driver *con_driver = &registered_con_driver[i];
2986
2987 if (con_driver->con == NULL) {
2988 con_driver->con = conswitchp;
2989 con_driver->desc = display_desc;
2990 con_driver->flag = CON_DRIVER_FLAG_INIT;
2991 con_driver->first = 0;
2992 con_driver->last = MAX_NR_CONSOLES - 1;
2993 break;
2994 }
2995 }
2996
2997 for (i = 0; i < MAX_NR_CONSOLES; i++)
2998 con_driver_map[i] = conswitchp;
2999
3000 if (blankinterval) {
3001 blank_state = blank_normal_wait;
3002 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3003 }
3004
3005 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3006 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3007 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3008 tty_port_init(&vc->port);
3009 visual_init(vc, currcons, 1);
3010 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3011 vc_init(vc, vc->vc_rows, vc->vc_cols,
3012 currcons || !vc->vc_sw->con_save_screen);
3013 }
3014 currcons = fg_console = 0;
3015 master_display_fg = vc = vc_cons[currcons].d;
3016 set_origin(vc);
3017 save_screen(vc);
3018 gotoxy(vc, vc->vc_x, vc->vc_y);
3019 csi_J(vc, 0);
3020 update_screen(vc);
3021 pr_info("Console: %s %s %dx%d\n",
3022 vc->vc_can_do_color ? "colour" : "mono",
3023 display_desc, vc->vc_cols, vc->vc_rows);
3024 printable = 1;
3025
3026 console_unlock();
3027
3028 #ifdef CONFIG_VT_CONSOLE
3029 register_console(&vt_console_driver);
3030 #endif
3031 return 0;
3032 }
3033 console_initcall(con_init);
3034
3035 static const struct tty_operations con_ops = {
3036 .install = con_install,
3037 .open = con_open,
3038 .close = con_close,
3039 .write = con_write,
3040 .write_room = con_write_room,
3041 .put_char = con_put_char,
3042 .flush_chars = con_flush_chars,
3043 .chars_in_buffer = con_chars_in_buffer,
3044 .ioctl = vt_ioctl,
3045 #ifdef CONFIG_COMPAT
3046 .compat_ioctl = vt_compat_ioctl,
3047 #endif
3048 .stop = con_stop,
3049 .start = con_start,
3050 .throttle = con_throttle,
3051 .unthrottle = con_unthrottle,
3052 .resize = vt_resize,
3053 .shutdown = con_shutdown
3054 };
3055
3056 static struct cdev vc0_cdev;
3057
3058 static ssize_t show_tty_active(struct device *dev,
3059 struct device_attribute *attr, char *buf)
3060 {
3061 return sprintf(buf, "tty%d\n", fg_console + 1);
3062 }
3063 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3064
3065 static struct attribute *vt_dev_attrs[] = {
3066 &dev_attr_active.attr,
3067 NULL
3068 };
3069
3070 ATTRIBUTE_GROUPS(vt_dev);
3071
3072 int __init vty_init(const struct file_operations *console_fops)
3073 {
3074 cdev_init(&vc0_cdev, console_fops);
3075 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3076 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3077 panic("Couldn't register /dev/tty0 driver\n");
3078 tty0dev = device_create_with_groups(tty_class, NULL,
3079 MKDEV(TTY_MAJOR, 0), NULL,
3080 vt_dev_groups, "tty0");
3081 if (IS_ERR(tty0dev))
3082 tty0dev = NULL;
3083
3084 vcs_init();
3085
3086 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3087 if (!console_driver)
3088 panic("Couldn't allocate console driver\n");
3089
3090 console_driver->name = "tty";
3091 console_driver->name_base = 1;
3092 console_driver->major = TTY_MAJOR;
3093 console_driver->minor_start = 1;
3094 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3095 console_driver->init_termios = tty_std_termios;
3096 if (default_utf8)
3097 console_driver->init_termios.c_iflag |= IUTF8;
3098 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3099 tty_set_operations(console_driver, &con_ops);
3100 if (tty_register_driver(console_driver))
3101 panic("Couldn't register console driver\n");
3102 kbd_init();
3103 console_map_init();
3104 #ifdef CONFIG_MDA_CONSOLE
3105 mda_console_init();
3106 #endif
3107 return 0;
3108 }
3109
3110 #ifndef VT_SINGLE_DRIVER
3111
3112 static struct class *vtconsole_class;
3113
3114 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3115 int deflt)
3116 {
3117 struct module *owner = csw->owner;
3118 const char *desc = NULL;
3119 struct con_driver *con_driver;
3120 int i, j = -1, k = -1, retval = -ENODEV;
3121
3122 if (!try_module_get(owner))
3123 return -ENODEV;
3124
3125 WARN_CONSOLE_UNLOCKED();
3126
3127 /* check if driver is registered */
3128 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3129 con_driver = &registered_con_driver[i];
3130
3131 if (con_driver->con == csw) {
3132 desc = con_driver->desc;
3133 retval = 0;
3134 break;
3135 }
3136 }
3137
3138 if (retval)
3139 goto err;
3140
3141 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3142 csw->con_startup();
3143 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3144 }
3145
3146 if (deflt) {
3147 if (conswitchp)
3148 module_put(conswitchp->owner);
3149
3150 __module_get(owner);
3151 conswitchp = csw;
3152 }
3153
3154 first = max(first, con_driver->first);
3155 last = min(last, con_driver->last);
3156
3157 for (i = first; i <= last; i++) {
3158 int old_was_color;
3159 struct vc_data *vc = vc_cons[i].d;
3160
3161 if (con_driver_map[i])
3162 module_put(con_driver_map[i]->owner);
3163 __module_get(owner);
3164 con_driver_map[i] = csw;
3165
3166 if (!vc || !vc->vc_sw)
3167 continue;
3168
3169 j = i;
3170
3171 if (con_is_visible(vc)) {
3172 k = i;
3173 save_screen(vc);
3174 }
3175
3176 old_was_color = vc->vc_can_do_color;
3177 vc->vc_sw->con_deinit(vc);
3178 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3179 visual_init(vc, i, 0);
3180 set_origin(vc);
3181 update_attr(vc);
3182
3183 /* If the console changed between mono <-> color, then
3184 * the attributes in the screenbuf will be wrong. The
3185 * following resets all attributes to something sane.
3186 */
3187 if (old_was_color != vc->vc_can_do_color)
3188 clear_buffer_attributes(vc);
3189 }
3190
3191 pr_info("Console: switching ");
3192 if (!deflt)
3193 printk(KERN_CONT "consoles %d-%d ", first+1, last+1);
3194 if (j >= 0) {
3195 struct vc_data *vc = vc_cons[j].d;
3196
3197 printk(KERN_CONT "to %s %s %dx%d\n",
3198 vc->vc_can_do_color ? "colour" : "mono",
3199 desc, vc->vc_cols, vc->vc_rows);
3200
3201 if (k >= 0) {
3202 vc = vc_cons[k].d;
3203 update_screen(vc);
3204 }
3205 } else
3206 printk(KERN_CONT "to %s\n", desc);
3207
3208 retval = 0;
3209 err:
3210 module_put(owner);
3211 return retval;
3212 };
3213
3214
3215 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3216 /* unlocked version of unbind_con_driver() */
3217 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3218 {
3219 struct module *owner = csw->owner;
3220 const struct consw *defcsw = NULL;
3221 struct con_driver *con_driver = NULL, *con_back = NULL;
3222 int i, retval = -ENODEV;
3223
3224 if (!try_module_get(owner))
3225 return -ENODEV;
3226
3227 WARN_CONSOLE_UNLOCKED();
3228
3229 /* check if driver is registered and if it is unbindable */
3230 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3231 con_driver = &registered_con_driver[i];
3232
3233 if (con_driver->con == csw &&
3234 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3235 retval = 0;
3236 break;
3237 }
3238 }
3239
3240 if (retval)
3241 goto err;
3242
3243 retval = -ENODEV;
3244
3245 /* check if backup driver exists */
3246 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3247 con_back = &registered_con_driver[i];
3248
3249 if (con_back->con && con_back->con != csw) {
3250 defcsw = con_back->con;
3251 retval = 0;
3252 break;
3253 }
3254 }
3255
3256 if (retval)
3257 goto err;
3258
3259 if (!con_is_bound(csw))
3260 goto err;
3261
3262 first = max(first, con_driver->first);
3263 last = min(last, con_driver->last);
3264
3265 for (i = first; i <= last; i++) {
3266 if (con_driver_map[i] == csw) {
3267 module_put(csw->owner);
3268 con_driver_map[i] = NULL;
3269 }
3270 }
3271
3272 if (!con_is_bound(defcsw)) {
3273 const struct consw *defconsw = conswitchp;
3274
3275 defcsw->con_startup();
3276 con_back->flag |= CON_DRIVER_FLAG_INIT;
3277 /*
3278 * vgacon may change the default driver to point
3279 * to dummycon, we restore it here...
3280 */
3281 conswitchp = defconsw;
3282 }
3283
3284 if (!con_is_bound(csw))
3285 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3286
3287 /* ignore return value, binding should not fail */
3288 do_bind_con_driver(defcsw, first, last, deflt);
3289 err:
3290 module_put(owner);
3291 return retval;
3292
3293 }
3294 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3295
3296 static int vt_bind(struct con_driver *con)
3297 {
3298 const struct consw *defcsw = NULL, *csw = NULL;
3299 int i, more = 1, first = -1, last = -1, deflt = 0;
3300
3301 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3302 goto err;
3303
3304 csw = con->con;
3305
3306 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3307 struct con_driver *con = &registered_con_driver[i];
3308
3309 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3310 defcsw = con->con;
3311 break;
3312 }
3313 }
3314
3315 if (!defcsw)
3316 goto err;
3317
3318 while (more) {
3319 more = 0;
3320
3321 for (i = con->first; i <= con->last; i++) {
3322 if (con_driver_map[i] == defcsw) {
3323 if (first == -1)
3324 first = i;
3325 last = i;
3326 more = 1;
3327 } else if (first != -1)
3328 break;
3329 }
3330
3331 if (first == 0 && last == MAX_NR_CONSOLES -1)
3332 deflt = 1;
3333
3334 if (first != -1)
3335 do_bind_con_driver(csw, first, last, deflt);
3336
3337 first = -1;
3338 last = -1;
3339 deflt = 0;
3340 }
3341
3342 err:
3343 return 0;
3344 }
3345
3346 static int vt_unbind(struct con_driver *con)
3347 {
3348 const struct consw *csw = NULL;
3349 int i, more = 1, first = -1, last = -1, deflt = 0;
3350 int ret;
3351
3352 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3353 goto err;
3354
3355 csw = con->con;
3356
3357 while (more) {
3358 more = 0;
3359
3360 for (i = con->first; i <= con->last; i++) {
3361 if (con_driver_map[i] == csw) {
3362 if (first == -1)
3363 first = i;
3364 last = i;
3365 more = 1;
3366 } else if (first != -1)
3367 break;
3368 }
3369
3370 if (first == 0 && last == MAX_NR_CONSOLES -1)
3371 deflt = 1;
3372
3373 if (first != -1) {
3374 ret = do_unbind_con_driver(csw, first, last, deflt);
3375 if (ret != 0)
3376 return ret;
3377 }
3378
3379 first = -1;
3380 last = -1;
3381 deflt = 0;
3382 }
3383
3384 err:
3385 return 0;
3386 }
3387 #else
3388 static inline int vt_bind(struct con_driver *con)
3389 {
3390 return 0;
3391 }
3392 static inline int vt_unbind(struct con_driver *con)
3393 {
3394 return 0;
3395 }
3396 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3397
3398 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3399 const char *buf, size_t count)
3400 {
3401 struct con_driver *con = dev_get_drvdata(dev);
3402 int bind = simple_strtoul(buf, NULL, 0);
3403
3404 console_lock();
3405
3406 if (bind)
3407 vt_bind(con);
3408 else
3409 vt_unbind(con);
3410
3411 console_unlock();
3412
3413 return count;
3414 }
3415
3416 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3417 char *buf)
3418 {
3419 struct con_driver *con = dev_get_drvdata(dev);
3420 int bind = con_is_bound(con->con);
3421
3422 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3423 }
3424
3425 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3426 char *buf)
3427 {
3428 struct con_driver *con = dev_get_drvdata(dev);
3429
3430 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3431 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3432 con->desc);
3433
3434 }
3435
3436 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3437 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3438
3439 static struct attribute *con_dev_attrs[] = {
3440 &dev_attr_bind.attr,
3441 &dev_attr_name.attr,
3442 NULL
3443 };
3444
3445 ATTRIBUTE_GROUPS(con_dev);
3446
3447 static int vtconsole_init_device(struct con_driver *con)
3448 {
3449 con->flag |= CON_DRIVER_FLAG_ATTR;
3450 return 0;
3451 }
3452
3453 static void vtconsole_deinit_device(struct con_driver *con)
3454 {
3455 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3456 }
3457
3458 /**
3459 * con_is_bound - checks if driver is bound to the console
3460 * @csw: console driver
3461 *
3462 * RETURNS: zero if unbound, nonzero if bound
3463 *
3464 * Drivers can call this and if zero, they should release
3465 * all resources allocated on con_startup()
3466 */
3467 int con_is_bound(const struct consw *csw)
3468 {
3469 int i, bound = 0;
3470
3471 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3472 if (con_driver_map[i] == csw) {
3473 bound = 1;
3474 break;
3475 }
3476 }
3477
3478 return bound;
3479 }
3480 EXPORT_SYMBOL(con_is_bound);
3481
3482 /**
3483 * con_debug_enter - prepare the console for the kernel debugger
3484 * @sw: console driver
3485 *
3486 * Called when the console is taken over by the kernel debugger, this
3487 * function needs to save the current console state, then put the console
3488 * into a state suitable for the kernel debugger.
3489 *
3490 * RETURNS:
3491 * Zero on success, nonzero if a failure occurred when trying to prepare
3492 * the console for the debugger.
3493 */
3494 int con_debug_enter(struct vc_data *vc)
3495 {
3496 int ret = 0;
3497
3498 saved_fg_console = fg_console;
3499 saved_last_console = last_console;
3500 saved_want_console = want_console;
3501 saved_vc_mode = vc->vc_mode;
3502 saved_console_blanked = console_blanked;
3503 vc->vc_mode = KD_TEXT;
3504 console_blanked = 0;
3505 if (vc->vc_sw->con_debug_enter)
3506 ret = vc->vc_sw->con_debug_enter(vc);
3507 #ifdef CONFIG_KGDB_KDB
3508 /* Set the initial LINES variable if it is not already set */
3509 if (vc->vc_rows < 999) {
3510 int linecount;
3511 char lns[4];
3512 const char *setargs[3] = {
3513 "set",
3514 "LINES",
3515 lns,
3516 };
3517 if (kdbgetintenv(setargs[0], &linecount)) {
3518 snprintf(lns, 4, "%i", vc->vc_rows);
3519 kdb_set(2, setargs);
3520 }
3521 }
3522 if (vc->vc_cols < 999) {
3523 int colcount;
3524 char cols[4];
3525 const char *setargs[3] = {
3526 "set",
3527 "COLUMNS",
3528 cols,
3529 };
3530 if (kdbgetintenv(setargs[0], &colcount)) {
3531 snprintf(cols, 4, "%i", vc->vc_cols);
3532 kdb_set(2, setargs);
3533 }
3534 }
3535 #endif /* CONFIG_KGDB_KDB */
3536 return ret;
3537 }
3538 EXPORT_SYMBOL_GPL(con_debug_enter);
3539
3540 /**
3541 * con_debug_leave - restore console state
3542 * @sw: console driver
3543 *
3544 * Restore the console state to what it was before the kernel debugger
3545 * was invoked.
3546 *
3547 * RETURNS:
3548 * Zero on success, nonzero if a failure occurred when trying to restore
3549 * the console.
3550 */
3551 int con_debug_leave(void)
3552 {
3553 struct vc_data *vc;
3554 int ret = 0;
3555
3556 fg_console = saved_fg_console;
3557 last_console = saved_last_console;
3558 want_console = saved_want_console;
3559 console_blanked = saved_console_blanked;
3560 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3561
3562 vc = vc_cons[fg_console].d;
3563 if (vc->vc_sw->con_debug_leave)
3564 ret = vc->vc_sw->con_debug_leave(vc);
3565 return ret;
3566 }
3567 EXPORT_SYMBOL_GPL(con_debug_leave);
3568
3569 static int do_register_con_driver(const struct consw *csw, int first, int last)
3570 {
3571 struct module *owner = csw->owner;
3572 struct con_driver *con_driver;
3573 const char *desc;
3574 int i, retval;
3575
3576 WARN_CONSOLE_UNLOCKED();
3577
3578 if (!try_module_get(owner))
3579 return -ENODEV;
3580
3581 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3582 con_driver = &registered_con_driver[i];
3583
3584 /* already registered */
3585 if (con_driver->con == csw) {
3586 retval = -EBUSY;
3587 goto err;
3588 }
3589 }
3590
3591 desc = csw->con_startup();
3592 if (!desc) {
3593 retval = -ENODEV;
3594 goto err;
3595 }
3596
3597 retval = -EINVAL;
3598
3599 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3600 con_driver = &registered_con_driver[i];
3601
3602 if (con_driver->con == NULL &&
3603 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3604 con_driver->con = csw;
3605 con_driver->desc = desc;
3606 con_driver->node = i;
3607 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3608 CON_DRIVER_FLAG_INIT;
3609 con_driver->first = first;
3610 con_driver->last = last;
3611 retval = 0;
3612 break;
3613 }
3614 }
3615
3616 if (retval)
3617 goto err;
3618
3619 con_driver->dev =
3620 device_create_with_groups(vtconsole_class, NULL,
3621 MKDEV(0, con_driver->node),
3622 con_driver, con_dev_groups,
3623 "vtcon%i", con_driver->node);
3624 if (IS_ERR(con_driver->dev)) {
3625 printk(KERN_WARNING "Unable to create device for %s; "
3626 "errno = %ld\n", con_driver->desc,
3627 PTR_ERR(con_driver->dev));
3628 con_driver->dev = NULL;
3629 } else {
3630 vtconsole_init_device(con_driver);
3631 }
3632
3633 err:
3634 module_put(owner);
3635 return retval;
3636 }
3637
3638
3639 /**
3640 * do_unregister_con_driver - unregister console driver from console layer
3641 * @csw: console driver
3642 *
3643 * DESCRIPTION: All drivers that registers to the console layer must
3644 * call this function upon exit, or if the console driver is in a state
3645 * where it won't be able to handle console services, such as the
3646 * framebuffer console without loaded framebuffer drivers.
3647 *
3648 * The driver must unbind first prior to unregistration.
3649 */
3650 int do_unregister_con_driver(const struct consw *csw)
3651 {
3652 int i;
3653
3654 /* cannot unregister a bound driver */
3655 if (con_is_bound(csw))
3656 return -EBUSY;
3657
3658 if (csw == conswitchp)
3659 return -EINVAL;
3660
3661 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3662 struct con_driver *con_driver = &registered_con_driver[i];
3663
3664 if (con_driver->con == csw) {
3665 /*
3666 * Defer the removal of the sysfs entries since that
3667 * will acquire the kernfs s_active lock and we can't
3668 * acquire this lock while holding the console lock:
3669 * the unbind sysfs entry imposes already the opposite
3670 * order. Reset con already here to prevent any later
3671 * lookup to succeed and mark this slot as zombie, so
3672 * it won't get reused until we complete the removal
3673 * in the deferred work.
3674 */
3675 con_driver->con = NULL;
3676 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3677 schedule_work(&con_driver_unregister_work);
3678
3679 return 0;
3680 }
3681 }
3682
3683 return -ENODEV;
3684 }
3685 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3686
3687 static void con_driver_unregister_callback(struct work_struct *ignored)
3688 {
3689 int i;
3690
3691 console_lock();
3692
3693 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3694 struct con_driver *con_driver = &registered_con_driver[i];
3695
3696 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3697 continue;
3698
3699 console_unlock();
3700
3701 vtconsole_deinit_device(con_driver);
3702 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3703
3704 console_lock();
3705
3706 if (WARN_ON_ONCE(con_driver->con))
3707 con_driver->con = NULL;
3708 con_driver->desc = NULL;
3709 con_driver->dev = NULL;
3710 con_driver->node = 0;
3711 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3712 con_driver->flag = 0;
3713 con_driver->first = 0;
3714 con_driver->last = 0;
3715 }
3716
3717 console_unlock();
3718 }
3719
3720 /*
3721 * If we support more console drivers, this function is used
3722 * when a driver wants to take over some existing consoles
3723 * and become default driver for newly opened ones.
3724 *
3725 * do_take_over_console is basically a register followed by unbind
3726 */
3727 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3728 {
3729 int err;
3730
3731 err = do_register_con_driver(csw, first, last);
3732 /*
3733 * If we get an busy error we still want to bind the console driver
3734 * and return success, as we may have unbound the console driver
3735 * but not unregistered it.
3736 */
3737 if (err == -EBUSY)
3738 err = 0;
3739 if (!err)
3740 do_bind_con_driver(csw, first, last, deflt);
3741
3742 return err;
3743 }
3744 EXPORT_SYMBOL_GPL(do_take_over_console);
3745
3746
3747 /*
3748 * give_up_console is a wrapper to unregister_con_driver. It will only
3749 * work if driver is fully unbound.
3750 */
3751 void give_up_console(const struct consw *csw)
3752 {
3753 console_lock();
3754 do_unregister_con_driver(csw);
3755 console_unlock();
3756 }
3757
3758 static int __init vtconsole_class_init(void)
3759 {
3760 int i;
3761
3762 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3763 if (IS_ERR(vtconsole_class)) {
3764 printk(KERN_WARNING "Unable to create vt console class; "
3765 "errno = %ld\n", PTR_ERR(vtconsole_class));
3766 vtconsole_class = NULL;
3767 }
3768
3769 /* Add system drivers to sysfs */
3770 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3771 struct con_driver *con = &registered_con_driver[i];
3772
3773 if (con->con && !con->dev) {
3774 con->dev =
3775 device_create_with_groups(vtconsole_class, NULL,
3776 MKDEV(0, con->node),
3777 con, con_dev_groups,
3778 "vtcon%i", con->node);
3779
3780 if (IS_ERR(con->dev)) {
3781 printk(KERN_WARNING "Unable to create "
3782 "device for %s; errno = %ld\n",
3783 con->desc, PTR_ERR(con->dev));
3784 con->dev = NULL;
3785 } else {
3786 vtconsole_init_device(con);
3787 }
3788 }
3789 }
3790
3791 return 0;
3792 }
3793 postcore_initcall(vtconsole_class_init);
3794
3795 #endif
3796
3797 /*
3798 * Screen blanking
3799 */
3800
3801 static int set_vesa_blanking(char __user *p)
3802 {
3803 unsigned int mode;
3804
3805 if (get_user(mode, p + 1))
3806 return -EFAULT;
3807
3808 vesa_blank_mode = (mode < 4) ? mode : 0;
3809 return 0;
3810 }
3811
3812 void do_blank_screen(int entering_gfx)
3813 {
3814 struct vc_data *vc = vc_cons[fg_console].d;
3815 int i;
3816
3817 WARN_CONSOLE_UNLOCKED();
3818
3819 if (console_blanked) {
3820 if (blank_state == blank_vesa_wait) {
3821 blank_state = blank_off;
3822 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3823 }
3824 return;
3825 }
3826
3827 /* entering graphics mode? */
3828 if (entering_gfx) {
3829 hide_cursor(vc);
3830 save_screen(vc);
3831 vc->vc_sw->con_blank(vc, -1, 1);
3832 console_blanked = fg_console + 1;
3833 blank_state = blank_off;
3834 set_origin(vc);
3835 return;
3836 }
3837
3838 if (blank_state != blank_normal_wait)
3839 return;
3840 blank_state = blank_off;
3841
3842 /* don't blank graphics */
3843 if (vc->vc_mode != KD_TEXT) {
3844 console_blanked = fg_console + 1;
3845 return;
3846 }
3847
3848 hide_cursor(vc);
3849 del_timer_sync(&console_timer);
3850 blank_timer_expired = 0;
3851
3852 save_screen(vc);
3853 /* In case we need to reset origin, blanking hook returns 1 */
3854 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3855 console_blanked = fg_console + 1;
3856 if (i)
3857 set_origin(vc);
3858
3859 if (console_blank_hook && console_blank_hook(1))
3860 return;
3861
3862 if (vesa_off_interval && vesa_blank_mode) {
3863 blank_state = blank_vesa_wait;
3864 mod_timer(&console_timer, jiffies + vesa_off_interval);
3865 }
3866 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3867 }
3868 EXPORT_SYMBOL(do_blank_screen);
3869
3870 /*
3871 * Called by timer as well as from vt_console_driver
3872 */
3873 void do_unblank_screen(int leaving_gfx)
3874 {
3875 struct vc_data *vc;
3876
3877 /* This should now always be called from a "sane" (read: can schedule)
3878 * context for the sake of the low level drivers, except in the special
3879 * case of oops_in_progress
3880 */
3881 if (!oops_in_progress)
3882 might_sleep();
3883
3884 WARN_CONSOLE_UNLOCKED();
3885
3886 ignore_poke = 0;
3887 if (!console_blanked)
3888 return;
3889 if (!vc_cons_allocated(fg_console)) {
3890 /* impossible */
3891 pr_warn("unblank_screen: tty %d not allocated ??\n",
3892 fg_console + 1);
3893 return;
3894 }
3895 vc = vc_cons[fg_console].d;
3896 /* Try to unblank in oops case too */
3897 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3898 return; /* but leave console_blanked != 0 */
3899
3900 if (blankinterval) {
3901 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3902 blank_state = blank_normal_wait;
3903 }
3904
3905 console_blanked = 0;
3906 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3907 /* Low-level driver cannot restore -> do it ourselves */
3908 update_screen(vc);
3909 if (console_blank_hook)
3910 console_blank_hook(0);
3911 set_palette(vc);
3912 set_cursor(vc);
3913 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3914 }
3915 EXPORT_SYMBOL(do_unblank_screen);
3916
3917 /*
3918 * This is called by the outside world to cause a forced unblank, mostly for
3919 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3920 * call it with 1 as an argument and so force a mode restore... that may kill
3921 * X or at least garbage the screen but would also make the Oops visible...
3922 */
3923 void unblank_screen(void)
3924 {
3925 do_unblank_screen(0);
3926 }
3927
3928 /*
3929 * We defer the timer blanking to work queue so it can take the console mutex
3930 * (console operations can still happen at irq time, but only from printk which
3931 * has the console mutex. Not perfect yet, but better than no locking
3932 */
3933 static void blank_screen_t(unsigned long dummy)
3934 {
3935 blank_timer_expired = 1;
3936 schedule_work(&console_work);
3937 }
3938
3939 void poke_blanked_console(void)
3940 {
3941 WARN_CONSOLE_UNLOCKED();
3942
3943 /* Add this so we quickly catch whoever might call us in a non
3944 * safe context. Nowadays, unblank_screen() isn't to be called in
3945 * atomic contexts and is allowed to schedule (with the special case
3946 * of oops_in_progress, but that isn't of any concern for this
3947 * function. --BenH.
3948 */
3949 might_sleep();
3950
3951 /* This isn't perfectly race free, but a race here would be mostly harmless,
3952 * at worse, we'll do a spurrious blank and it's unlikely
3953 */
3954 del_timer(&console_timer);
3955 blank_timer_expired = 0;
3956
3957 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3958 return;
3959 if (console_blanked)
3960 unblank_screen();
3961 else if (blankinterval) {
3962 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3963 blank_state = blank_normal_wait;
3964 }
3965 }
3966
3967 /*
3968 * Palettes
3969 */
3970
3971 static void set_palette(struct vc_data *vc)
3972 {
3973 WARN_CONSOLE_UNLOCKED();
3974
3975 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3976 vc->vc_sw->con_set_palette(vc, color_table);
3977 }
3978
3979 /*
3980 * Load palette into the DAC registers. arg points to a colour
3981 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3982 */
3983
3984 int con_set_cmap(unsigned char __user *arg)
3985 {
3986 int i, j, k;
3987 unsigned char colormap[3*16];
3988
3989 if (copy_from_user(colormap, arg, sizeof(colormap)))
3990 return -EFAULT;
3991
3992 console_lock();
3993 for (i = k = 0; i < 16; i++) {
3994 default_red[i] = colormap[k++];
3995 default_grn[i] = colormap[k++];
3996 default_blu[i] = colormap[k++];
3997 }
3998 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3999 if (!vc_cons_allocated(i))
4000 continue;
4001 for (j = k = 0; j < 16; j++) {
4002 vc_cons[i].d->vc_palette[k++] = default_red[j];
4003 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4004 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4005 }
4006 set_palette(vc_cons[i].d);
4007 }
4008 console_unlock();
4009
4010 return 0;
4011 }
4012
4013 int con_get_cmap(unsigned char __user *arg)
4014 {
4015 int i, k;
4016 unsigned char colormap[3*16];
4017
4018 console_lock();
4019 for (i = k = 0; i < 16; i++) {
4020 colormap[k++] = default_red[i];
4021 colormap[k++] = default_grn[i];
4022 colormap[k++] = default_blu[i];
4023 }
4024 console_unlock();
4025
4026 if (copy_to_user(arg, colormap, sizeof(colormap)))
4027 return -EFAULT;
4028
4029 return 0;
4030 }
4031
4032 void reset_palette(struct vc_data *vc)
4033 {
4034 int j, k;
4035 for (j=k=0; j<16; j++) {
4036 vc->vc_palette[k++] = default_red[j];
4037 vc->vc_palette[k++] = default_grn[j];
4038 vc->vc_palette[k++] = default_blu[j];
4039 }
4040 set_palette(vc);
4041 }
4042
4043 /*
4044 * Font switching
4045 *
4046 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4047 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4048 * depending on width) reserved for each character which is kinda wasty, but
4049 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4050 * is up to the actual low-level console-driver convert data into its favorite
4051 * format (maybe we should add a `fontoffset' field to the `display'
4052 * structure so we won't have to convert the fontdata all the time.
4053 * /Jes
4054 */
4055
4056 #define max_font_size 65536
4057
4058 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4059 {
4060 struct console_font font;
4061 int rc = -EINVAL;
4062 int c;
4063
4064 if (op->data) {
4065 font.data = kmalloc(max_font_size, GFP_KERNEL);
4066 if (!font.data)
4067 return -ENOMEM;
4068 } else
4069 font.data = NULL;
4070
4071 console_lock();
4072 if (vc->vc_mode != KD_TEXT)
4073 rc = -EINVAL;
4074 else if (vc->vc_sw->con_font_get)
4075 rc = vc->vc_sw->con_font_get(vc, &font);
4076 else
4077 rc = -ENOSYS;
4078 console_unlock();
4079
4080 if (rc)
4081 goto out;
4082
4083 c = (font.width+7)/8 * 32 * font.charcount;
4084
4085 if (op->data && font.charcount > op->charcount)
4086 rc = -ENOSPC;
4087 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4088 if (font.width > op->width || font.height > op->height)
4089 rc = -ENOSPC;
4090 } else {
4091 if (font.width != 8)
4092 rc = -EIO;
4093 else if ((op->height && font.height > op->height) ||
4094 font.height > 32)
4095 rc = -ENOSPC;
4096 }
4097 if (rc)
4098 goto out;
4099
4100 op->height = font.height;
4101 op->width = font.width;
4102 op->charcount = font.charcount;
4103
4104 if (op->data && copy_to_user(op->data, font.data, c))
4105 rc = -EFAULT;
4106
4107 out:
4108 kfree(font.data);
4109 return rc;
4110 }
4111
4112 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4113 {
4114 struct console_font font;
4115 int rc = -EINVAL;
4116 int size;
4117
4118 if (vc->vc_mode != KD_TEXT)
4119 return -EINVAL;
4120 if (!op->data)
4121 return -EINVAL;
4122 if (op->charcount > 512)
4123 return -EINVAL;
4124 if (!op->height) { /* Need to guess font height [compat] */
4125 int h, i;
4126 u8 __user *charmap = op->data;
4127 u8 tmp;
4128
4129 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4130 so that we can get rid of this soon */
4131 if (!(op->flags & KD_FONT_FLAG_OLD))
4132 return -EINVAL;
4133 for (h = 32; h > 0; h--)
4134 for (i = 0; i < op->charcount; i++) {
4135 if (get_user(tmp, &charmap[32*i+h-1]))
4136 return -EFAULT;
4137 if (tmp)
4138 goto nonzero;
4139 }
4140 return -EINVAL;
4141 nonzero:
4142 op->height = h;
4143 }
4144 if (op->width <= 0 || op->width > 32 || op->height > 32)
4145 return -EINVAL;
4146 size = (op->width+7)/8 * 32 * op->charcount;
4147 if (size > max_font_size)
4148 return -ENOSPC;
4149 font.charcount = op->charcount;
4150 font.height = op->height;
4151 font.width = op->width;
4152 font.data = memdup_user(op->data, size);
4153 if (IS_ERR(font.data))
4154 return PTR_ERR(font.data);
4155 console_lock();
4156 if (vc->vc_mode != KD_TEXT)
4157 rc = -EINVAL;
4158 else if (vc->vc_sw->con_font_set)
4159 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4160 else
4161 rc = -ENOSYS;
4162 console_unlock();
4163 kfree(font.data);
4164 return rc;
4165 }
4166
4167 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4168 {
4169 struct console_font font = {.width = op->width, .height = op->height};
4170 char name[MAX_FONT_NAME];
4171 char *s = name;
4172 int rc;
4173
4174
4175 if (!op->data)
4176 s = NULL;
4177 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4178 return -EFAULT;
4179 else
4180 name[MAX_FONT_NAME - 1] = 0;
4181
4182 console_lock();
4183 if (vc->vc_mode != KD_TEXT) {
4184 console_unlock();
4185 return -EINVAL;
4186 }
4187 if (vc->vc_sw->con_font_default)
4188 rc = vc->vc_sw->con_font_default(vc, &font, s);
4189 else
4190 rc = -ENOSYS;
4191 console_unlock();
4192 if (!rc) {
4193 op->width = font.width;
4194 op->height = font.height;
4195 }
4196 return rc;
4197 }
4198
4199 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4200 {
4201 int con = op->height;
4202 int rc;
4203
4204
4205 console_lock();
4206 if (vc->vc_mode != KD_TEXT)
4207 rc = -EINVAL;
4208 else if (!vc->vc_sw->con_font_copy)
4209 rc = -ENOSYS;
4210 else if (con < 0 || !vc_cons_allocated(con))
4211 rc = -ENOTTY;
4212 else if (con == vc->vc_num) /* nothing to do */
4213 rc = 0;
4214 else
4215 rc = vc->vc_sw->con_font_copy(vc, con);
4216 console_unlock();
4217 return rc;
4218 }
4219
4220 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4221 {
4222 switch (op->op) {
4223 case KD_FONT_OP_SET:
4224 return con_font_set(vc, op);
4225 case KD_FONT_OP_GET:
4226 return con_font_get(vc, op);
4227 case KD_FONT_OP_SET_DEFAULT:
4228 return con_font_default(vc, op);
4229 case KD_FONT_OP_COPY:
4230 return con_font_copy(vc, op);
4231 }
4232 return -ENOSYS;
4233 }
4234
4235 /*
4236 * Interface exported to selection and vcs.
4237 */
4238
4239 /* used by selection */
4240 u16 screen_glyph(struct vc_data *vc, int offset)
4241 {
4242 u16 w = scr_readw(screenpos(vc, offset, 1));
4243 u16 c = w & 0xff;
4244
4245 if (w & vc->vc_hi_font_mask)
4246 c |= 0x100;
4247 return c;
4248 }
4249 EXPORT_SYMBOL_GPL(screen_glyph);
4250
4251 /* used by vcs - note the word offset */
4252 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4253 {
4254 return screenpos(vc, 2 * w_offset, viewed);
4255 }
4256 EXPORT_SYMBOL_GPL(screen_pos);
4257
4258 void getconsxy(struct vc_data *vc, unsigned char *p)
4259 {
4260 p[0] = vc->vc_x;
4261 p[1] = vc->vc_y;
4262 }
4263
4264 void putconsxy(struct vc_data *vc, unsigned char *p)
4265 {
4266 hide_cursor(vc);
4267 gotoxy(vc, p[0], p[1]);
4268 set_cursor(vc);
4269 }
4270
4271 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4272 {
4273 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4274 return softcursor_original;
4275 return scr_readw(org);
4276 }
4277
4278 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4279 {
4280 scr_writew(val, org);
4281 if ((unsigned long)org == vc->vc_pos) {
4282 softcursor_original = -1;
4283 add_softcursor(vc);
4284 }
4285 }
4286
4287 void vcs_scr_updated(struct vc_data *vc)
4288 {
4289 notify_update(vc);
4290 }
4291
4292 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4293 unsigned int rolled_over, void *base, unsigned int size)
4294 {
4295 unsigned long ubase = (unsigned long)base;
4296 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4297 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4298 ptrdiff_t origin = (void *)c->vc_origin - base;
4299 int margin = c->vc_size_row * 4;
4300 int from, wrap, from_off, avail;
4301
4302 /* Turn scrollback off */
4303 if (!lines) {
4304 c->vc_visible_origin = c->vc_origin;
4305 return;
4306 }
4307
4308 /* Do we have already enough to allow jumping from 0 to the end? */
4309 if (rolled_over > scr_end + margin) {
4310 from = scr_end;
4311 wrap = rolled_over + c->vc_size_row;
4312 } else {
4313 from = 0;
4314 wrap = size;
4315 }
4316
4317 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4318 avail = (origin - from + wrap) % wrap;
4319
4320 /* Only a little piece would be left? Show all incl. the piece! */
4321 if (avail < 2 * margin)
4322 margin = 0;
4323 if (from_off < margin)
4324 from_off = 0;
4325 if (from_off > avail - margin)
4326 from_off = avail;
4327
4328 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4329 }
4330 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4331
4332 /*
4333 * Visible symbols for modules
4334 */
4335
4336 EXPORT_SYMBOL(color_table);
4337 EXPORT_SYMBOL(default_red);
4338 EXPORT_SYMBOL(default_grn);
4339 EXPORT_SYMBOL(default_blu);
4340 EXPORT_SYMBOL(update_region);
4341 EXPORT_SYMBOL(redraw_screen);
4342 EXPORT_SYMBOL(vc_resize);
4343 EXPORT_SYMBOL(fg_console);
4344 EXPORT_SYMBOL(console_blank_hook);
4345 EXPORT_SYMBOL(console_blanked);
4346 EXPORT_SYMBOL(vc_cons);
4347 EXPORT_SYMBOL(global_cursor_default);
4348 #ifndef VT_SINGLE_DRIVER
4349 EXPORT_SYMBOL(give_up_console);
4350 #endif