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Linux 4.19.133
[linux/fpc-iii.git] / drivers / tty / vt / vt.c
blob5c7a968a5ea6753bbd5b1eba17cbfd1914ea62cc
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6 /*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
61 * deletion SMP-safe. 17Jun00, Andrew Morton
62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72 */
73
74 #include <linux/module.h>
75 #include <linux/types.h>
76 #include <linux/sched/signal.h>
77 #include <linux/tty.h>
78 #include <linux/tty_flip.h>
79 #include <linux/kernel.h>
80 #include <linux/string.h>
81 #include <linux/errno.h>
82 #include <linux/kd.h>
83 #include <linux/slab.h>
84 #include <linux/vmalloc.h>
85 #include <linux/major.h>
86 #include <linux/mm.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/mutex.h>
90 #include <linux/vt_kern.h>
91 #include <linux/selection.h>
92 #include <linux/tiocl.h>
93 #include <linux/kbd_kern.h>
94 #include <linux/consolemap.h>
95 #include <linux/timer.h>
96 #include <linux/interrupt.h>
97 #include <linux/workqueue.h>
98 #include <linux/pm.h>
99 #include <linux/font.h>
100 #include <linux/bitops.h>
101 #include <linux/notifier.h>
102 #include <linux/device.h>
103 #include <linux/io.h>
104 #include <linux/uaccess.h>
105 #include <linux/kdb.h>
106 #include <linux/ctype.h>
107 #include <linux/bsearch.h>
108 #include <linux/gcd.h>
109
110 #define MAX_NR_CON_DRIVER 16
111
112 #define CON_DRIVER_FLAG_MODULE 1
113 #define CON_DRIVER_FLAG_INIT 2
114 #define CON_DRIVER_FLAG_ATTR 4
115 #define CON_DRIVER_FLAG_ZOMBIE 8
116
117 struct con_driver {
118 const struct consw *con;
119 const char *desc;
120 struct device *dev;
121 int node;
122 int first;
123 int last;
124 int flag;
125 };
126
127 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
128 const struct consw *conswitchp;
129
130 /* A bitmap for codes <32. A bit of 1 indicates that the code
131 * corresponding to that bit number invokes some special action
132 * (such as cursor movement) and should not be displayed as a
133 * glyph unless the disp_ctrl mode is explicitly enabled.
134 */
135 #define CTRL_ACTION 0x0d00ff81
136 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
137
138 /*
139 * Here is the default bell parameters: 750HZ, 1/8th of a second
140 */
141 #define DEFAULT_BELL_PITCH 750
142 #define DEFAULT_BELL_DURATION (HZ/8)
143 #define DEFAULT_CURSOR_BLINK_MS 200
144
145 struct vc vc_cons [MAX_NR_CONSOLES];
146
147 #ifndef VT_SINGLE_DRIVER
148 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
149 #endif
150
151 static int con_open(struct tty_struct *, struct file *);
152 static void vc_init(struct vc_data *vc, unsigned int rows,
153 unsigned int cols, int do_clear);
154 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
155 static void save_cur(struct vc_data *vc);
156 static void reset_terminal(struct vc_data *vc, int do_clear);
157 static void con_flush_chars(struct tty_struct *tty);
158 static int set_vesa_blanking(char __user *p);
159 static void set_cursor(struct vc_data *vc);
160 static void hide_cursor(struct vc_data *vc);
161 static void console_callback(struct work_struct *ignored);
162 static void con_driver_unregister_callback(struct work_struct *ignored);
163 static void blank_screen_t(struct timer_list *unused);
164 static void set_palette(struct vc_data *vc);
165
166 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
167
168 static int printable; /* Is console ready for printing? */
169 int default_utf8 = true;
170 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
171 int global_cursor_default = -1;
172 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
173
174 static int cur_default = CUR_DEFAULT;
175 module_param(cur_default, int, S_IRUGO | S_IWUSR);
176
177 /*
178 * ignore_poke: don't unblank the screen when things are typed. This is
179 * mainly for the privacy of braille terminal users.
180 */
181 static int ignore_poke;
182
183 int do_poke_blanked_console;
184 int console_blanked;
185
186 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
187 static int vesa_off_interval;
188 static int blankinterval;
189 core_param(consoleblank, blankinterval, int, 0444);
190
191 static DECLARE_WORK(console_work, console_callback);
192 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
193
194 /*
195 * fg_console is the current virtual console,
196 * last_console is the last used one,
197 * want_console is the console we want to switch to,
198 * saved_* variants are for save/restore around kernel debugger enter/leave
199 */
200 int fg_console;
201 int last_console;
202 int want_console = -1;
203 static int saved_fg_console;
204 static int saved_last_console;
205 static int saved_want_console;
206 static int saved_vc_mode;
207 static int saved_console_blanked;
208
209 /*
210 * For each existing display, we have a pointer to console currently visible
211 * on that display, allowing consoles other than fg_console to be refreshed
212 * appropriately. Unless the low-level driver supplies its own display_fg
213 * variable, we use this one for the "master display".
214 */
215 static struct vc_data *master_display_fg;
216
217 /*
218 * Unfortunately, we need to delay tty echo when we're currently writing to the
219 * console since the code is (and always was) not re-entrant, so we schedule
220 * all flip requests to process context with schedule-task() and run it from
221 * console_callback().
222 */
223
224 /*
225 * For the same reason, we defer scrollback to the console callback.
226 */
227 static int scrollback_delta;
228
229 /*
230 * Hook so that the power management routines can (un)blank
231 * the console on our behalf.
232 */
233 int (*console_blank_hook)(int);
234
235 static DEFINE_TIMER(console_timer, blank_screen_t);
236 static int blank_state;
237 static int blank_timer_expired;
238 enum {
239 blank_off = 0,
240 blank_normal_wait,
241 blank_vesa_wait,
242 };
243
244 /*
245 * /sys/class/tty/tty0/
246 *
247 * the attribute 'active' contains the name of the current vc
248 * console and it supports poll() to detect vc switches
249 */
250 static struct device *tty0dev;
251
252 /*
253 * Notifier list for console events.
254 */
255 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
256
257 int register_vt_notifier(struct notifier_block *nb)
258 {
259 return atomic_notifier_chain_register(&vt_notifier_list, nb);
260 }
261 EXPORT_SYMBOL_GPL(register_vt_notifier);
262
263 int unregister_vt_notifier(struct notifier_block *nb)
264 {
265 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
266 }
267 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
268
269 static void notify_write(struct vc_data *vc, unsigned int unicode)
270 {
271 struct vt_notifier_param param = { .vc = vc, .c = unicode };
272 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
273 }
274
275 static void notify_update(struct vc_data *vc)
276 {
277 struct vt_notifier_param param = { .vc = vc };
278 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
279 }
280 /*
281 * Low-Level Functions
282 */
283
284 static inline bool con_is_fg(const struct vc_data *vc)
285 {
286 return vc->vc_num == fg_console;
287 }
288
289 static inline bool con_should_update(const struct vc_data *vc)
290 {
291 return con_is_visible(vc) && !console_blanked;
292 }
293
294 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
295 {
296 unsigned short *p;
297
298 if (!viewed)
299 p = (unsigned short *)(vc->vc_origin + offset);
300 else if (!vc->vc_sw->con_screen_pos)
301 p = (unsigned short *)(vc->vc_visible_origin + offset);
302 else
303 p = vc->vc_sw->con_screen_pos(vc, offset);
304 return p;
305 }
306
307 /* Called from the keyboard irq path.. */
308 static inline void scrolldelta(int lines)
309 {
310 /* FIXME */
311 /* scrolldelta needs some kind of consistency lock, but the BKL was
312 and still is not protecting versus the scheduled back end */
313 scrollback_delta += lines;
314 schedule_console_callback();
315 }
316
317 void schedule_console_callback(void)
318 {
319 schedule_work(&console_work);
320 }
321
322 /*
323 * Code to manage unicode-based screen buffers
324 */
325
326 #ifdef NO_VC_UNI_SCREEN
327 /* this disables and optimizes related code away at compile time */
328 #define get_vc_uniscr(vc) NULL
329 #else
330 #define get_vc_uniscr(vc) vc->vc_uni_screen
331 #endif
332
333 #define VC_UNI_SCREEN_DEBUG 0
334
335 typedef uint32_t char32_t;
336
337 /*
338 * Our screen buffer is preceded by an array of line pointers so that
339 * scrolling only implies some pointer shuffling.
340 */
341 struct uni_screen {
342 char32_t *lines[0];
343 };
344
345 static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
346 {
347 struct uni_screen *uniscr;
348 void *p;
349 unsigned int memsize, i;
350
351 /* allocate everything in one go */
352 memsize = cols * rows * sizeof(char32_t);
353 memsize += rows * sizeof(char32_t *);
354 p = vmalloc(memsize);
355 if (!p)
356 return NULL;
357
358 /* initial line pointers */
359 uniscr = p;
360 p = uniscr->lines + rows;
361 for (i = 0; i < rows; i++) {
362 uniscr->lines[i] = p;
363 p += cols * sizeof(char32_t);
364 }
365 return uniscr;
366 }
367
368 static void vc_uniscr_free(struct uni_screen *uniscr)
369 {
370 vfree(uniscr);
371 }
372
373 static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
374 {
375 vc_uniscr_free(vc->vc_uni_screen);
376 vc->vc_uni_screen = new_uniscr;
377 }
378
379 static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
380 {
381 struct uni_screen *uniscr = get_vc_uniscr(vc);
382
383 if (uniscr)
384 uniscr->lines[vc->vc_y][vc->vc_x] = uc;
385 }
386
387 static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
388 {
389 struct uni_screen *uniscr = get_vc_uniscr(vc);
390
391 if (uniscr) {
392 char32_t *ln = uniscr->lines[vc->vc_y];
393 unsigned int x = vc->vc_x, cols = vc->vc_cols;
394
395 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
396 memset32(&ln[x], ' ', nr);
397 }
398 }
399
400 static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
401 {
402 struct uni_screen *uniscr = get_vc_uniscr(vc);
403
404 if (uniscr) {
405 char32_t *ln = uniscr->lines[vc->vc_y];
406 unsigned int x = vc->vc_x, cols = vc->vc_cols;
407
408 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
409 memset32(&ln[cols - nr], ' ', nr);
410 }
411 }
412
413 static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
414 unsigned int nr)
415 {
416 struct uni_screen *uniscr = get_vc_uniscr(vc);
417
418 if (uniscr) {
419 char32_t *ln = uniscr->lines[vc->vc_y];
420
421 memset32(&ln[x], ' ', nr);
422 }
423 }
424
425 static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
426 unsigned int nr)
427 {
428 struct uni_screen *uniscr = get_vc_uniscr(vc);
429
430 if (uniscr) {
431 unsigned int cols = vc->vc_cols;
432
433 while (nr--)
434 memset32(uniscr->lines[y++], ' ', cols);
435 }
436 }
437
438 static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
439 enum con_scroll dir, unsigned int nr)
440 {
441 struct uni_screen *uniscr = get_vc_uniscr(vc);
442
443 if (uniscr) {
444 unsigned int i, j, k, sz, d, clear;
445
446 sz = b - t;
447 clear = b - nr;
448 d = nr;
449 if (dir == SM_DOWN) {
450 clear = t;
451 d = sz - nr;
452 }
453 for (i = 0; i < gcd(d, sz); i++) {
454 char32_t *tmp = uniscr->lines[t + i];
455 j = i;
456 while (1) {
457 k = j + d;
458 if (k >= sz)
459 k -= sz;
460 if (k == i)
461 break;
462 uniscr->lines[t + j] = uniscr->lines[t + k];
463 j = k;
464 }
465 uniscr->lines[t + j] = tmp;
466 }
467 vc_uniscr_clear_lines(vc, clear, nr);
468 }
469 }
470
471 static void vc_uniscr_copy_area(struct uni_screen *dst,
472 unsigned int dst_cols,
473 unsigned int dst_rows,
474 struct uni_screen *src,
475 unsigned int src_cols,
476 unsigned int src_top_row,
477 unsigned int src_bot_row)
478 {
479 unsigned int dst_row = 0;
480
481 if (!dst)
482 return;
483
484 while (src_top_row < src_bot_row) {
485 char32_t *src_line = src->lines[src_top_row];
486 char32_t *dst_line = dst->lines[dst_row];
487
488 memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
489 if (dst_cols - src_cols)
490 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
491 src_top_row++;
492 dst_row++;
493 }
494 while (dst_row < dst_rows) {
495 char32_t *dst_line = dst->lines[dst_row];
496
497 memset32(dst_line, ' ', dst_cols);
498 dst_row++;
499 }
500 }
501
502 /*
503 * Called from vcs_read() to make sure unicode screen retrieval is possible.
504 * This will initialize the unicode screen buffer if not already done.
505 * This returns 0 if OK, or a negative error code otherwise.
506 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
507 */
508 int vc_uniscr_check(struct vc_data *vc)
509 {
510 struct uni_screen *uniscr;
511 unsigned short *p;
512 int x, y, mask;
513
514 if (__is_defined(NO_VC_UNI_SCREEN))
515 return -EOPNOTSUPP;
516
517 WARN_CONSOLE_UNLOCKED();
518
519 if (!vc->vc_utf)
520 return -ENODATA;
521
522 if (vc->vc_uni_screen)
523 return 0;
524
525 uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
526 if (!uniscr)
527 return -ENOMEM;
528
529 /*
530 * Let's populate it initially with (imperfect) reverse translation.
531 * This is the next best thing we can do short of having it enabled
532 * from the start even when no users rely on this functionality. True
533 * unicode content will be available after a complete screen refresh.
534 */
535 p = (unsigned short *)vc->vc_origin;
536 mask = vc->vc_hi_font_mask | 0xff;
537 for (y = 0; y < vc->vc_rows; y++) {
538 char32_t *line = uniscr->lines[y];
539 for (x = 0; x < vc->vc_cols; x++) {
540 u16 glyph = scr_readw(p++) & mask;
541 line[x] = inverse_translate(vc, glyph, true);
542 }
543 }
544
545 vc->vc_uni_screen = uniscr;
546 return 0;
547 }
548
549 /*
550 * Called from vcs_read() to get the unicode data from the screen.
551 * This must be preceded by a successful call to vc_uniscr_check() once
552 * the console lock has been taken.
553 */
554 void vc_uniscr_copy_line(struct vc_data *vc, void *dest, int viewed,
555 unsigned int row, unsigned int col, unsigned int nr)
556 {
557 struct uni_screen *uniscr = get_vc_uniscr(vc);
558 int offset = row * vc->vc_size_row + col * 2;
559 unsigned long pos;
560
561 BUG_ON(!uniscr);
562
563 pos = (unsigned long)screenpos(vc, offset, viewed);
564 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
565 /*
566 * Desired position falls in the main screen buffer.
567 * However the actual row/col might be different if
568 * scrollback is active.
569 */
570 row = (pos - vc->vc_origin) / vc->vc_size_row;
571 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
572 memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
573 } else {
574 /*
575 * Scrollback is active. For now let's simply backtranslate
576 * the screen glyphs until the unicode screen buffer does
577 * synchronize with console display drivers for a scrollback
578 * buffer of its own.
579 */
580 u16 *p = (u16 *)pos;
581 int mask = vc->vc_hi_font_mask | 0xff;
582 char32_t *uni_buf = dest;
583 while (nr--) {
584 u16 glyph = scr_readw(p++) & mask;
585 *uni_buf++ = inverse_translate(vc, glyph, true);
586 }
587 }
588 }
589
590 /* this is for validation and debugging only */
591 static void vc_uniscr_debug_check(struct vc_data *vc)
592 {
593 struct uni_screen *uniscr = get_vc_uniscr(vc);
594 unsigned short *p;
595 int x, y, mask;
596
597 if (!VC_UNI_SCREEN_DEBUG || !uniscr)
598 return;
599
600 WARN_CONSOLE_UNLOCKED();
601
602 /*
603 * Make sure our unicode screen translates into the same glyphs
604 * as the actual screen. This is brutal indeed.
605 */
606 p = (unsigned short *)vc->vc_origin;
607 mask = vc->vc_hi_font_mask | 0xff;
608 for (y = 0; y < vc->vc_rows; y++) {
609 char32_t *line = uniscr->lines[y];
610 for (x = 0; x < vc->vc_cols; x++) {
611 u16 glyph = scr_readw(p++) & mask;
612 char32_t uc = line[x];
613 int tc = conv_uni_to_pc(vc, uc);
614 if (tc == -4)
615 tc = conv_uni_to_pc(vc, 0xfffd);
616 if (tc == -4)
617 tc = conv_uni_to_pc(vc, '?');
618 if (tc != glyph)
619 pr_err_ratelimited(
620 "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
621 __func__, x, y, glyph, tc);
622 }
623 }
624 }
625
626
627 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
628 enum con_scroll dir, unsigned int nr)
629 {
630 u16 *clear, *d, *s;
631
632 if (t + nr >= b)
633 nr = b - t - 1;
634 if (b > vc->vc_rows || t >= b || nr < 1)
635 return;
636 vc_uniscr_scroll(vc, t, b, dir, nr);
637 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
638 return;
639
640 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
641 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
642
643 if (dir == SM_UP) {
644 clear = s + (b - t - nr) * vc->vc_cols;
645 swap(s, d);
646 }
647 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
648 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
649 }
650
651 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
652 {
653 unsigned int xx, yy, offset;
654 u16 *p;
655
656 p = (u16 *) start;
657 if (!vc->vc_sw->con_getxy) {
658 offset = (start - vc->vc_origin) / 2;
659 xx = offset % vc->vc_cols;
660 yy = offset / vc->vc_cols;
661 } else {
662 int nxx, nyy;
663 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
664 xx = nxx; yy = nyy;
665 }
666 for(;;) {
667 u16 attrib = scr_readw(p) & 0xff00;
668 int startx = xx;
669 u16 *q = p;
670 while (xx < vc->vc_cols && count) {
671 if (attrib != (scr_readw(p) & 0xff00)) {
672 if (p > q)
673 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
674 startx = xx;
675 q = p;
676 attrib = scr_readw(p) & 0xff00;
677 }
678 p++;
679 xx++;
680 count--;
681 }
682 if (p > q)
683 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
684 if (!count)
685 break;
686 xx = 0;
687 yy++;
688 if (vc->vc_sw->con_getxy) {
689 p = (u16 *)start;
690 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
691 }
692 }
693 }
694
695 void update_region(struct vc_data *vc, unsigned long start, int count)
696 {
697 WARN_CONSOLE_UNLOCKED();
698
699 if (con_should_update(vc)) {
700 hide_cursor(vc);
701 do_update_region(vc, start, count);
702 set_cursor(vc);
703 }
704 }
705
706 /* Structure of attributes is hardware-dependent */
707
708 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
709 u8 _underline, u8 _reverse, u8 _italic)
710 {
711 if (vc->vc_sw->con_build_attr)
712 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
713 _blink, _underline, _reverse, _italic);
714
715 /*
716 * ++roman: I completely changed the attribute format for monochrome
717 * mode (!can_do_color). The formerly used MDA (monochrome display
718 * adapter) format didn't allow the combination of certain effects.
719 * Now the attribute is just a bit vector:
720 * Bit 0..1: intensity (0..2)
721 * Bit 2 : underline
722 * Bit 3 : reverse
723 * Bit 7 : blink
724 */
725 {
726 u8 a = _color;
727 if (!vc->vc_can_do_color)
728 return _intensity |
729 (_italic ? 2 : 0) |
730 (_underline ? 4 : 0) |
731 (_reverse ? 8 : 0) |
732 (_blink ? 0x80 : 0);
733 if (_italic)
734 a = (a & 0xF0) | vc->vc_itcolor;
735 else if (_underline)
736 a = (a & 0xf0) | vc->vc_ulcolor;
737 else if (_intensity == 0)
738 a = (a & 0xf0) | vc->vc_halfcolor;
739 if (_reverse)
740 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
741 if (_blink)
742 a ^= 0x80;
743 if (_intensity == 2)
744 a ^= 0x08;
745 if (vc->vc_hi_font_mask == 0x100)
746 a <<= 1;
747 return a;
748 }
749 }
750
751 static void update_attr(struct vc_data *vc)
752 {
753 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
754 vc->vc_blink, vc->vc_underline,
755 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
756 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
757 }
758
759 /* Note: inverting the screen twice should revert to the original state */
760 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
761 {
762 unsigned short *p;
763
764 WARN_CONSOLE_UNLOCKED();
765
766 count /= 2;
767 p = screenpos(vc, offset, viewed);
768 if (vc->vc_sw->con_invert_region) {
769 vc->vc_sw->con_invert_region(vc, p, count);
770 } else {
771 u16 *q = p;
772 int cnt = count;
773 u16 a;
774
775 if (!vc->vc_can_do_color) {
776 while (cnt--) {
777 a = scr_readw(q);
778 a ^= 0x0800;
779 scr_writew(a, q);
780 q++;
781 }
782 } else if (vc->vc_hi_font_mask == 0x100) {
783 while (cnt--) {
784 a = scr_readw(q);
785 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
786 scr_writew(a, q);
787 q++;
788 }
789 } else {
790 while (cnt--) {
791 a = scr_readw(q);
792 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
793 scr_writew(a, q);
794 q++;
795 }
796 }
797 }
798
799 if (con_should_update(vc))
800 do_update_region(vc, (unsigned long) p, count);
801 notify_update(vc);
802 }
803
804 /* used by selection: complement pointer position */
805 void complement_pos(struct vc_data *vc, int offset)
806 {
807 static int old_offset = -1;
808 static unsigned short old;
809 static unsigned short oldx, oldy;
810
811 WARN_CONSOLE_UNLOCKED();
812
813 if (old_offset != -1 && old_offset >= 0 &&
814 old_offset < vc->vc_screenbuf_size) {
815 scr_writew(old, screenpos(vc, old_offset, 1));
816 if (con_should_update(vc))
817 vc->vc_sw->con_putc(vc, old, oldy, oldx);
818 notify_update(vc);
819 }
820
821 old_offset = offset;
822
823 if (offset != -1 && offset >= 0 &&
824 offset < vc->vc_screenbuf_size) {
825 unsigned short new;
826 unsigned short *p;
827 p = screenpos(vc, offset, 1);
828 old = scr_readw(p);
829 new = old ^ vc->vc_complement_mask;
830 scr_writew(new, p);
831 if (con_should_update(vc)) {
832 oldx = (offset >> 1) % vc->vc_cols;
833 oldy = (offset >> 1) / vc->vc_cols;
834 vc->vc_sw->con_putc(vc, new, oldy, oldx);
835 }
836 notify_update(vc);
837 }
838 }
839
840 static void insert_char(struct vc_data *vc, unsigned int nr)
841 {
842 unsigned short *p = (unsigned short *) vc->vc_pos;
843
844 vc_uniscr_insert(vc, nr);
845 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
846 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
847 vc->vc_need_wrap = 0;
848 if (con_should_update(vc))
849 do_update_region(vc, (unsigned long) p,
850 vc->vc_cols - vc->vc_x);
851 }
852
853 static void delete_char(struct vc_data *vc, unsigned int nr)
854 {
855 unsigned short *p = (unsigned short *) vc->vc_pos;
856
857 vc_uniscr_delete(vc, nr);
858 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
859 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
860 nr * 2);
861 vc->vc_need_wrap = 0;
862 if (con_should_update(vc))
863 do_update_region(vc, (unsigned long) p,
864 vc->vc_cols - vc->vc_x);
865 }
866
867 static int softcursor_original = -1;
868
869 static void add_softcursor(struct vc_data *vc)
870 {
871 int i = scr_readw((u16 *) vc->vc_pos);
872 u32 type = vc->vc_cursor_type;
873
874 if (! (type & 0x10)) return;
875 if (softcursor_original != -1) return;
876 softcursor_original = i;
877 i |= ((type >> 8) & 0xff00 );
878 i ^= ((type) & 0xff00 );
879 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
880 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
881 scr_writew(i, (u16 *) vc->vc_pos);
882 if (con_should_update(vc))
883 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
884 }
885
886 static void hide_softcursor(struct vc_data *vc)
887 {
888 if (softcursor_original != -1) {
889 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
890 if (con_should_update(vc))
891 vc->vc_sw->con_putc(vc, softcursor_original,
892 vc->vc_y, vc->vc_x);
893 softcursor_original = -1;
894 }
895 }
896
897 static void hide_cursor(struct vc_data *vc)
898 {
899 if (vc_is_sel(vc))
900 clear_selection();
901
902 vc->vc_sw->con_cursor(vc, CM_ERASE);
903 hide_softcursor(vc);
904 }
905
906 static void set_cursor(struct vc_data *vc)
907 {
908 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
909 return;
910 if (vc->vc_deccm) {
911 if (vc_is_sel(vc))
912 clear_selection();
913 add_softcursor(vc);
914 if ((vc->vc_cursor_type & 0x0f) != 1)
915 vc->vc_sw->con_cursor(vc, CM_DRAW);
916 } else
917 hide_cursor(vc);
918 }
919
920 static void set_origin(struct vc_data *vc)
921 {
922 WARN_CONSOLE_UNLOCKED();
923
924 if (!con_is_visible(vc) ||
925 !vc->vc_sw->con_set_origin ||
926 !vc->vc_sw->con_set_origin(vc))
927 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
928 vc->vc_visible_origin = vc->vc_origin;
929 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
930 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
931 }
932
933 static void save_screen(struct vc_data *vc)
934 {
935 WARN_CONSOLE_UNLOCKED();
936
937 if (vc->vc_sw->con_save_screen)
938 vc->vc_sw->con_save_screen(vc);
939 }
940
941 static void flush_scrollback(struct vc_data *vc)
942 {
943 WARN_CONSOLE_UNLOCKED();
944
945 set_origin(vc);
946 if (vc->vc_sw->con_flush_scrollback) {
947 vc->vc_sw->con_flush_scrollback(vc);
948 } else if (con_is_visible(vc)) {
949 /*
950 * When no con_flush_scrollback method is provided then the
951 * legacy way for flushing the scrollback buffer is to use
952 * a side effect of the con_switch method. We do it only on
953 * the foreground console as background consoles have no
954 * scrollback buffers in that case and we obviously don't
955 * want to switch to them.
956 */
957 hide_cursor(vc);
958 vc->vc_sw->con_switch(vc);
959 set_cursor(vc);
960 }
961 }
962
963 /*
964 * Redrawing of screen
965 */
966
967 void clear_buffer_attributes(struct vc_data *vc)
968 {
969 unsigned short *p = (unsigned short *)vc->vc_origin;
970 int count = vc->vc_screenbuf_size / 2;
971 int mask = vc->vc_hi_font_mask | 0xff;
972
973 for (; count > 0; count--, p++) {
974 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
975 }
976 }
977
978 void redraw_screen(struct vc_data *vc, int is_switch)
979 {
980 int redraw = 0;
981
982 WARN_CONSOLE_UNLOCKED();
983
984 if (!vc) {
985 /* strange ... */
986 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
987 return;
988 }
989
990 if (is_switch) {
991 struct vc_data *old_vc = vc_cons[fg_console].d;
992 if (old_vc == vc)
993 return;
994 if (!con_is_visible(vc))
995 redraw = 1;
996 *vc->vc_display_fg = vc;
997 fg_console = vc->vc_num;
998 hide_cursor(old_vc);
999 if (!con_is_visible(old_vc)) {
1000 save_screen(old_vc);
1001 set_origin(old_vc);
1002 }
1003 if (tty0dev)
1004 sysfs_notify(&tty0dev->kobj, NULL, "active");
1005 } else {
1006 hide_cursor(vc);
1007 redraw = 1;
1008 }
1009
1010 if (redraw) {
1011 int update;
1012 int old_was_color = vc->vc_can_do_color;
1013
1014 set_origin(vc);
1015 update = vc->vc_sw->con_switch(vc);
1016 set_palette(vc);
1017 /*
1018 * If console changed from mono<->color, the best we can do
1019 * is to clear the buffer attributes. As it currently stands,
1020 * rebuilding new attributes from the old buffer is not doable
1021 * without overly complex code.
1022 */
1023 if (old_was_color != vc->vc_can_do_color) {
1024 update_attr(vc);
1025 clear_buffer_attributes(vc);
1026 }
1027
1028 /* Forcibly update if we're panicing */
1029 if ((update && vc->vc_mode != KD_GRAPHICS) ||
1030 vt_force_oops_output(vc))
1031 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1032 }
1033 set_cursor(vc);
1034 if (is_switch) {
1035 set_leds();
1036 compute_shiftstate();
1037 notify_update(vc);
1038 }
1039 }
1040
1041 /*
1042 * Allocation, freeing and resizing of VTs.
1043 */
1044
1045 int vc_cons_allocated(unsigned int i)
1046 {
1047 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1048 }
1049
1050 static void visual_init(struct vc_data *vc, int num, int init)
1051 {
1052 /* ++Geert: vc->vc_sw->con_init determines console size */
1053 if (vc->vc_sw)
1054 module_put(vc->vc_sw->owner);
1055 vc->vc_sw = conswitchp;
1056 #ifndef VT_SINGLE_DRIVER
1057 if (con_driver_map[num])
1058 vc->vc_sw = con_driver_map[num];
1059 #endif
1060 __module_get(vc->vc_sw->owner);
1061 vc->vc_num = num;
1062 vc->vc_display_fg = &master_display_fg;
1063 if (vc->vc_uni_pagedir_loc)
1064 con_free_unimap(vc);
1065 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
1066 vc->vc_uni_pagedir = NULL;
1067 vc->vc_hi_font_mask = 0;
1068 vc->vc_complement_mask = 0;
1069 vc->vc_can_do_color = 0;
1070 vc->vc_panic_force_write = false;
1071 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1072 vc->vc_sw->con_init(vc, init);
1073 if (!vc->vc_complement_mask)
1074 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1075 vc->vc_s_complement_mask = vc->vc_complement_mask;
1076 vc->vc_size_row = vc->vc_cols << 1;
1077 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1078 }
1079
1080
1081 static void visual_deinit(struct vc_data *vc)
1082 {
1083 vc->vc_sw->con_deinit(vc);
1084 module_put(vc->vc_sw->owner);
1085 }
1086
1087 static void vc_port_destruct(struct tty_port *port)
1088 {
1089 struct vc_data *vc = container_of(port, struct vc_data, port);
1090
1091 kfree(vc);
1092 }
1093
1094 static const struct tty_port_operations vc_port_ops = {
1095 .destruct = vc_port_destruct,
1096 };
1097
1098 int vc_allocate(unsigned int currcons) /* return 0 on success */
1099 {
1100 struct vt_notifier_param param;
1101 struct vc_data *vc;
1102
1103 WARN_CONSOLE_UNLOCKED();
1104
1105 if (currcons >= MAX_NR_CONSOLES)
1106 return -ENXIO;
1107
1108 if (vc_cons[currcons].d)
1109 return 0;
1110
1111 /* due to the granularity of kmalloc, we waste some memory here */
1112 /* the alloc is done in two steps, to optimize the common situation
1113 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1114 /* although the numbers above are not valid since long ago, the
1115 point is still up-to-date and the comment still has its value
1116 even if only as a historical artifact. --mj, July 1998 */
1117 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1118 if (!vc)
1119 return -ENOMEM;
1120
1121 vc_cons[currcons].d = vc;
1122 tty_port_init(&vc->port);
1123 vc->port.ops = &vc_port_ops;
1124 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1125
1126 visual_init(vc, currcons, 1);
1127
1128 if (!*vc->vc_uni_pagedir_loc)
1129 con_set_default_unimap(vc);
1130
1131 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1132 if (!vc->vc_screenbuf)
1133 goto err_free;
1134
1135 /* If no drivers have overridden us and the user didn't pass a
1136 boot option, default to displaying the cursor */
1137 if (global_cursor_default == -1)
1138 global_cursor_default = 1;
1139
1140 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1141 vcs_make_sysfs(currcons);
1142 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1143
1144 return 0;
1145 err_free:
1146 visual_deinit(vc);
1147 kfree(vc);
1148 vc_cons[currcons].d = NULL;
1149 return -ENOMEM;
1150 }
1151
1152 static inline int resize_screen(struct vc_data *vc, int width, int height,
1153 int user)
1154 {
1155 /* Resizes the resolution of the display adapater */
1156 int err = 0;
1157
1158 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
1159 err = vc->vc_sw->con_resize(vc, width, height, user);
1160
1161 return err;
1162 }
1163
1164 /*
1165 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1166 * [this is to be used together with some user program
1167 * like resize that changes the hardware videomode]
1168 */
1169 #define VC_RESIZE_MAXCOL (32767)
1170 #define VC_RESIZE_MAXROW (32767)
1171
1172 /**
1173 * vc_do_resize - resizing method for the tty
1174 * @tty: tty being resized
1175 * @real_tty: real tty (different to tty if a pty/tty pair)
1176 * @vc: virtual console private data
1177 * @cols: columns
1178 * @lines: lines
1179 *
1180 * Resize a virtual console, clipping according to the actual constraints.
1181 * If the caller passes a tty structure then update the termios winsize
1182 * information and perform any necessary signal handling.
1183 *
1184 * Caller must hold the console semaphore. Takes the termios rwsem and
1185 * ctrl_lock of the tty IFF a tty is passed.
1186 */
1187
1188 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1189 unsigned int cols, unsigned int lines)
1190 {
1191 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1192 unsigned long end;
1193 unsigned int old_rows, old_row_size, first_copied_row;
1194 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1195 unsigned int user;
1196 unsigned short *newscreen;
1197 struct uni_screen *new_uniscr = NULL;
1198
1199 WARN_CONSOLE_UNLOCKED();
1200
1201 if (!vc)
1202 return -ENXIO;
1203
1204 user = vc->vc_resize_user;
1205 vc->vc_resize_user = 0;
1206
1207 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
1208 return -EINVAL;
1209
1210 new_cols = (cols ? cols : vc->vc_cols);
1211 new_rows = (lines ? lines : vc->vc_rows);
1212 new_row_size = new_cols << 1;
1213 new_screen_size = new_row_size * new_rows;
1214
1215 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1216 return 0;
1217
1218 if (new_screen_size > KMALLOC_MAX_SIZE)
1219 return -EINVAL;
1220 newscreen = kzalloc(new_screen_size, GFP_USER);
1221 if (!newscreen)
1222 return -ENOMEM;
1223
1224 if (get_vc_uniscr(vc)) {
1225 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1226 if (!new_uniscr) {
1227 kfree(newscreen);
1228 return -ENOMEM;
1229 }
1230 }
1231
1232 if (vc_is_sel(vc))
1233 clear_selection();
1234
1235 old_rows = vc->vc_rows;
1236 old_row_size = vc->vc_size_row;
1237
1238 err = resize_screen(vc, new_cols, new_rows, user);
1239 if (err) {
1240 kfree(newscreen);
1241 vc_uniscr_free(new_uniscr);
1242 return err;
1243 }
1244
1245 vc->vc_rows = new_rows;
1246 vc->vc_cols = new_cols;
1247 vc->vc_size_row = new_row_size;
1248 vc->vc_screenbuf_size = new_screen_size;
1249
1250 rlth = min(old_row_size, new_row_size);
1251 rrem = new_row_size - rlth;
1252 old_origin = vc->vc_origin;
1253 new_origin = (long) newscreen;
1254 new_scr_end = new_origin + new_screen_size;
1255
1256 if (vc->vc_y > new_rows) {
1257 if (old_rows - vc->vc_y < new_rows) {
1258 /*
1259 * Cursor near the bottom, copy contents from the
1260 * bottom of buffer
1261 */
1262 first_copied_row = (old_rows - new_rows);
1263 } else {
1264 /*
1265 * Cursor is in no man's land, copy 1/2 screenful
1266 * from the top and bottom of cursor position
1267 */
1268 first_copied_row = (vc->vc_y - new_rows/2);
1269 }
1270 old_origin += first_copied_row * old_row_size;
1271 } else
1272 first_copied_row = 0;
1273 end = old_origin + old_row_size * min(old_rows, new_rows);
1274
1275 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1276 get_vc_uniscr(vc), rlth/2, first_copied_row,
1277 min(old_rows, new_rows));
1278 vc_uniscr_set(vc, new_uniscr);
1279
1280 update_attr(vc);
1281
1282 while (old_origin < end) {
1283 scr_memcpyw((unsigned short *) new_origin,
1284 (unsigned short *) old_origin, rlth);
1285 if (rrem)
1286 scr_memsetw((void *)(new_origin + rlth),
1287 vc->vc_video_erase_char, rrem);
1288 old_origin += old_row_size;
1289 new_origin += new_row_size;
1290 }
1291 if (new_scr_end > new_origin)
1292 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1293 new_scr_end - new_origin);
1294 kfree(vc->vc_screenbuf);
1295 vc->vc_screenbuf = newscreen;
1296 vc->vc_screenbuf_size = new_screen_size;
1297 set_origin(vc);
1298
1299 /* do part of a reset_terminal() */
1300 vc->vc_top = 0;
1301 vc->vc_bottom = vc->vc_rows;
1302 gotoxy(vc, vc->vc_x, vc->vc_y);
1303 save_cur(vc);
1304
1305 if (tty) {
1306 /* Rewrite the requested winsize data with the actual
1307 resulting sizes */
1308 struct winsize ws;
1309 memset(&ws, 0, sizeof(ws));
1310 ws.ws_row = vc->vc_rows;
1311 ws.ws_col = vc->vc_cols;
1312 ws.ws_ypixel = vc->vc_scan_lines;
1313 tty_do_resize(tty, &ws);
1314 }
1315
1316 if (con_is_visible(vc))
1317 update_screen(vc);
1318 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1319 notify_update(vc);
1320 return err;
1321 }
1322
1323 /**
1324 * vc_resize - resize a VT
1325 * @vc: virtual console
1326 * @cols: columns
1327 * @rows: rows
1328 *
1329 * Resize a virtual console as seen from the console end of things. We
1330 * use the common vc_do_resize methods to update the structures. The
1331 * caller must hold the console sem to protect console internals and
1332 * vc->port.tty
1333 */
1334
1335 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1336 {
1337 return vc_do_resize(vc->port.tty, vc, cols, rows);
1338 }
1339
1340 /**
1341 * vt_resize - resize a VT
1342 * @tty: tty to resize
1343 * @ws: winsize attributes
1344 *
1345 * Resize a virtual terminal. This is called by the tty layer as we
1346 * register our own handler for resizing. The mutual helper does all
1347 * the actual work.
1348 *
1349 * Takes the console sem and the called methods then take the tty
1350 * termios_rwsem and the tty ctrl_lock in that order.
1351 */
1352 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1353 {
1354 struct vc_data *vc = tty->driver_data;
1355 int ret;
1356
1357 console_lock();
1358 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1359 console_unlock();
1360 return ret;
1361 }
1362
1363 struct vc_data *vc_deallocate(unsigned int currcons)
1364 {
1365 struct vc_data *vc = NULL;
1366
1367 WARN_CONSOLE_UNLOCKED();
1368
1369 if (vc_cons_allocated(currcons)) {
1370 struct vt_notifier_param param;
1371
1372 param.vc = vc = vc_cons[currcons].d;
1373 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1374 vcs_remove_sysfs(currcons);
1375 visual_deinit(vc);
1376 put_pid(vc->vt_pid);
1377 vc_uniscr_set(vc, NULL);
1378 kfree(vc->vc_screenbuf);
1379 vc_cons[currcons].d = NULL;
1380 }
1381 return vc;
1382 }
1383
1384 /*
1385 * VT102 emulator
1386 */
1387
1388 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1389 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1390 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1391
1392 #define decarm VC_REPEAT
1393 #define decckm VC_CKMODE
1394 #define kbdapplic VC_APPLIC
1395 #define lnm VC_CRLF
1396
1397 /*
1398 * this is what the terminal answers to a ESC-Z or csi0c query.
1399 */
1400 #define VT100ID "\033[?1;2c"
1401 #define VT102ID "\033[?6c"
1402
1403 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1404 8,12,10,14, 9,13,11,15 };
1405
1406 /* the default colour table, for VGA+ colour systems */
1407 unsigned char default_red[] = {
1408 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1409 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1410 };
1411 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1412
1413 unsigned char default_grn[] = {
1414 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1415 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1416 };
1417 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1418
1419 unsigned char default_blu[] = {
1420 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1421 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1422 };
1423 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1424
1425 /*
1426 * gotoxy() must verify all boundaries, because the arguments
1427 * might also be negative. If the given position is out of
1428 * bounds, the cursor is placed at the nearest margin.
1429 */
1430 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1431 {
1432 int min_y, max_y;
1433
1434 if (new_x < 0)
1435 vc->vc_x = 0;
1436 else {
1437 if (new_x >= vc->vc_cols)
1438 vc->vc_x = vc->vc_cols - 1;
1439 else
1440 vc->vc_x = new_x;
1441 }
1442
1443 if (vc->vc_decom) {
1444 min_y = vc->vc_top;
1445 max_y = vc->vc_bottom;
1446 } else {
1447 min_y = 0;
1448 max_y = vc->vc_rows;
1449 }
1450 if (new_y < min_y)
1451 vc->vc_y = min_y;
1452 else if (new_y >= max_y)
1453 vc->vc_y = max_y - 1;
1454 else
1455 vc->vc_y = new_y;
1456 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1457 vc->vc_need_wrap = 0;
1458 }
1459
1460 /* for absolute user moves, when decom is set */
1461 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1462 {
1463 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1464 }
1465
1466 void scrollback(struct vc_data *vc)
1467 {
1468 scrolldelta(-(vc->vc_rows / 2));
1469 }
1470
1471 void scrollfront(struct vc_data *vc, int lines)
1472 {
1473 if (!lines)
1474 lines = vc->vc_rows / 2;
1475 scrolldelta(lines);
1476 }
1477
1478 static void lf(struct vc_data *vc)
1479 {
1480 /* don't scroll if above bottom of scrolling region, or
1481 * if below scrolling region
1482 */
1483 if (vc->vc_y + 1 == vc->vc_bottom)
1484 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1485 else if (vc->vc_y < vc->vc_rows - 1) {
1486 vc->vc_y++;
1487 vc->vc_pos += vc->vc_size_row;
1488 }
1489 vc->vc_need_wrap = 0;
1490 notify_write(vc, '\n');
1491 }
1492
1493 static void ri(struct vc_data *vc)
1494 {
1495 /* don't scroll if below top of scrolling region, or
1496 * if above scrolling region
1497 */
1498 if (vc->vc_y == vc->vc_top)
1499 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1500 else if (vc->vc_y > 0) {
1501 vc->vc_y--;
1502 vc->vc_pos -= vc->vc_size_row;
1503 }
1504 vc->vc_need_wrap = 0;
1505 }
1506
1507 static inline void cr(struct vc_data *vc)
1508 {
1509 vc->vc_pos -= vc->vc_x << 1;
1510 vc->vc_need_wrap = vc->vc_x = 0;
1511 notify_write(vc, '\r');
1512 }
1513
1514 static inline void bs(struct vc_data *vc)
1515 {
1516 if (vc->vc_x) {
1517 vc->vc_pos -= 2;
1518 vc->vc_x--;
1519 vc->vc_need_wrap = 0;
1520 notify_write(vc, '\b');
1521 }
1522 }
1523
1524 static inline void del(struct vc_data *vc)
1525 {
1526 /* ignored */
1527 }
1528
1529 static void csi_J(struct vc_data *vc, int vpar)
1530 {
1531 unsigned int count;
1532 unsigned short * start;
1533
1534 switch (vpar) {
1535 case 0: /* erase from cursor to end of display */
1536 vc_uniscr_clear_line(vc, vc->vc_x,
1537 vc->vc_cols - vc->vc_x);
1538 vc_uniscr_clear_lines(vc, vc->vc_y + 1,
1539 vc->vc_rows - vc->vc_y - 1);
1540 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1541 start = (unsigned short *)vc->vc_pos;
1542 break;
1543 case 1: /* erase from start to cursor */
1544 vc_uniscr_clear_line(vc, 0, vc->vc_x + 1);
1545 vc_uniscr_clear_lines(vc, 0, vc->vc_y);
1546 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1547 start = (unsigned short *)vc->vc_origin;
1548 break;
1549 case 3: /* include scrollback */
1550 flush_scrollback(vc);
1551 /* fallthrough */
1552 case 2: /* erase whole display */
1553 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1554 count = vc->vc_cols * vc->vc_rows;
1555 start = (unsigned short *)vc->vc_origin;
1556 break;
1557 default:
1558 return;
1559 }
1560 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1561 if (con_should_update(vc))
1562 do_update_region(vc, (unsigned long) start, count);
1563 vc->vc_need_wrap = 0;
1564 }
1565
1566 static void csi_K(struct vc_data *vc, int vpar)
1567 {
1568 unsigned int count;
1569 unsigned short *start = (unsigned short *)vc->vc_pos;
1570 int offset;
1571
1572 switch (vpar) {
1573 case 0: /* erase from cursor to end of line */
1574 offset = 0;
1575 count = vc->vc_cols - vc->vc_x;
1576 break;
1577 case 1: /* erase from start of line to cursor */
1578 offset = -vc->vc_x;
1579 count = vc->vc_x + 1;
1580 break;
1581 case 2: /* erase whole line */
1582 offset = -vc->vc_x;
1583 count = vc->vc_cols;
1584 break;
1585 default:
1586 return;
1587 }
1588 vc_uniscr_clear_line(vc, vc->vc_x + offset, count);
1589 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1590 vc->vc_need_wrap = 0;
1591 if (con_should_update(vc))
1592 do_update_region(vc, (unsigned long)(start + offset), count);
1593 }
1594
1595 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1596 { /* not vt100? */
1597 int count;
1598
1599 if (!vpar)
1600 vpar++;
1601 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1602
1603 vc_uniscr_clear_line(vc, vc->vc_x, count);
1604 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1605 if (con_should_update(vc))
1606 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1607 vc->vc_need_wrap = 0;
1608 }
1609
1610 static void default_attr(struct vc_data *vc)
1611 {
1612 vc->vc_intensity = 1;
1613 vc->vc_italic = 0;
1614 vc->vc_underline = 0;
1615 vc->vc_reverse = 0;
1616 vc->vc_blink = 0;
1617 vc->vc_color = vc->vc_def_color;
1618 }
1619
1620 struct rgb { u8 r; u8 g; u8 b; };
1621
1622 static void rgb_from_256(int i, struct rgb *c)
1623 {
1624 if (i < 8) { /* Standard colours. */
1625 c->r = i&1 ? 0xaa : 0x00;
1626 c->g = i&2 ? 0xaa : 0x00;
1627 c->b = i&4 ? 0xaa : 0x00;
1628 } else if (i < 16) {
1629 c->r = i&1 ? 0xff : 0x55;
1630 c->g = i&2 ? 0xff : 0x55;
1631 c->b = i&4 ? 0xff : 0x55;
1632 } else if (i < 232) { /* 6x6x6 colour cube. */
1633 c->r = (i - 16) / 36 * 85 / 2;
1634 c->g = (i - 16) / 6 % 6 * 85 / 2;
1635 c->b = (i - 16) % 6 * 85 / 2;
1636 } else /* Grayscale ramp. */
1637 c->r = c->g = c->b = i * 10 - 2312;
1638 }
1639
1640 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1641 {
1642 u8 hue = 0, max = max3(c->r, c->g, c->b);
1643
1644 if (c->r > max / 2)
1645 hue |= 4;
1646 if (c->g > max / 2)
1647 hue |= 2;
1648 if (c->b > max / 2)
1649 hue |= 1;
1650
1651 if (hue == 7 && max <= 0x55) {
1652 hue = 0;
1653 vc->vc_intensity = 2;
1654 } else if (max > 0xaa)
1655 vc->vc_intensity = 2;
1656 else
1657 vc->vc_intensity = 1;
1658
1659 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1660 }
1661
1662 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1663 {
1664 /* For backgrounds, err on the dark side. */
1665 vc->vc_color = (vc->vc_color & 0x0f)
1666 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1667 }
1668
1669 /*
1670 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1671 * and thus need to be detected and ignored by hand. Strictly speaking, that
1672 * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1673 * no one produces such codes and almost no one accepts them.
1674 *
1675 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1676 * supporting them.
1677 */
1678 static int vc_t416_color(struct vc_data *vc, int i,
1679 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1680 {
1681 struct rgb c;
1682
1683 i++;
1684 if (i > vc->vc_npar)
1685 return i;
1686
1687 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1688 /* 256 colours */
1689 i++;
1690 rgb_from_256(vc->vc_par[i], &c);
1691 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1692 /* 24 bit */
1693 c.r = vc->vc_par[i + 1];
1694 c.g = vc->vc_par[i + 2];
1695 c.b = vc->vc_par[i + 3];
1696 i += 3;
1697 } else
1698 return i;
1699
1700 set_color(vc, &c);
1701
1702 return i;
1703 }
1704
1705 /* console_lock is held */
1706 static void csi_m(struct vc_data *vc)
1707 {
1708 int i;
1709
1710 for (i = 0; i <= vc->vc_npar; i++)
1711 switch (vc->vc_par[i]) {
1712 case 0: /* all attributes off */
1713 default_attr(vc);
1714 break;
1715 case 1:
1716 vc->vc_intensity = 2;
1717 break;
1718 case 2:
1719 vc->vc_intensity = 0;
1720 break;
1721 case 3:
1722 vc->vc_italic = 1;
1723 break;
1724 case 21:
1725 /*
1726 * No console drivers support double underline, so
1727 * convert it to a single underline.
1728 */
1729 case 4:
1730 vc->vc_underline = 1;
1731 break;
1732 case 5:
1733 vc->vc_blink = 1;
1734 break;
1735 case 7:
1736 vc->vc_reverse = 1;
1737 break;
1738 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1739 * Select primary font, don't display control chars if
1740 * defined, don't set bit 8 on output.
1741 */
1742 vc->vc_translate = set_translate(vc->vc_charset == 0
1743 ? vc->vc_G0_charset
1744 : vc->vc_G1_charset, vc);
1745 vc->vc_disp_ctrl = 0;
1746 vc->vc_toggle_meta = 0;
1747 break;
1748 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1749 * Select first alternate font, lets chars < 32 be
1750 * displayed as ROM chars.
1751 */
1752 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1753 vc->vc_disp_ctrl = 1;
1754 vc->vc_toggle_meta = 0;
1755 break;
1756 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1757 * Select second alternate font, toggle high bit
1758 * before displaying as ROM char.
1759 */
1760 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1761 vc->vc_disp_ctrl = 1;
1762 vc->vc_toggle_meta = 1;
1763 break;
1764 case 22:
1765 vc->vc_intensity = 1;
1766 break;
1767 case 23:
1768 vc->vc_italic = 0;
1769 break;
1770 case 24:
1771 vc->vc_underline = 0;
1772 break;
1773 case 25:
1774 vc->vc_blink = 0;
1775 break;
1776 case 27:
1777 vc->vc_reverse = 0;
1778 break;
1779 case 38:
1780 i = vc_t416_color(vc, i, rgb_foreground);
1781 break;
1782 case 48:
1783 i = vc_t416_color(vc, i, rgb_background);
1784 break;
1785 case 39:
1786 vc->vc_color = (vc->vc_def_color & 0x0f) |
1787 (vc->vc_color & 0xf0);
1788 break;
1789 case 49:
1790 vc->vc_color = (vc->vc_def_color & 0xf0) |
1791 (vc->vc_color & 0x0f);
1792 break;
1793 default:
1794 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1795 if (vc->vc_par[i] < 100)
1796 vc->vc_intensity = 2;
1797 vc->vc_par[i] -= 60;
1798 }
1799 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1800 vc->vc_color = color_table[vc->vc_par[i] - 30]
1801 | (vc->vc_color & 0xf0);
1802 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1803 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1804 | (vc->vc_color & 0x0f);
1805 break;
1806 }
1807 update_attr(vc);
1808 }
1809
1810 static void respond_string(const char *p, struct tty_port *port)
1811 {
1812 while (*p) {
1813 tty_insert_flip_char(port, *p, 0);
1814 p++;
1815 }
1816 tty_schedule_flip(port);
1817 }
1818
1819 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1820 {
1821 char buf[40];
1822
1823 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1824 respond_string(buf, tty->port);
1825 }
1826
1827 static inline void status_report(struct tty_struct *tty)
1828 {
1829 respond_string("\033[0n", tty->port); /* Terminal ok */
1830 }
1831
1832 static inline void respond_ID(struct tty_struct *tty)
1833 {
1834 respond_string(VT102ID, tty->port);
1835 }
1836
1837 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1838 {
1839 char buf[8];
1840
1841 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1842 (char)('!' + mry));
1843 respond_string(buf, tty->port);
1844 }
1845
1846 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1847 int mouse_reporting(void)
1848 {
1849 return vc_cons[fg_console].d->vc_report_mouse;
1850 }
1851
1852 /* console_lock is held */
1853 static void set_mode(struct vc_data *vc, int on_off)
1854 {
1855 int i;
1856
1857 for (i = 0; i <= vc->vc_npar; i++)
1858 if (vc->vc_ques) {
1859 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1860 case 1: /* Cursor keys send ^[Ox/^[[x */
1861 if (on_off)
1862 set_kbd(vc, decckm);
1863 else
1864 clr_kbd(vc, decckm);
1865 break;
1866 case 3: /* 80/132 mode switch unimplemented */
1867 #if 0
1868 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1869 /* this alone does not suffice; some user mode
1870 utility has to change the hardware regs */
1871 #endif
1872 break;
1873 case 5: /* Inverted screen on/off */
1874 if (vc->vc_decscnm != on_off) {
1875 vc->vc_decscnm = on_off;
1876 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1877 update_attr(vc);
1878 }
1879 break;
1880 case 6: /* Origin relative/absolute */
1881 vc->vc_decom = on_off;
1882 gotoxay(vc, 0, 0);
1883 break;
1884 case 7: /* Autowrap on/off */
1885 vc->vc_decawm = on_off;
1886 break;
1887 case 8: /* Autorepeat on/off */
1888 if (on_off)
1889 set_kbd(vc, decarm);
1890 else
1891 clr_kbd(vc, decarm);
1892 break;
1893 case 9:
1894 vc->vc_report_mouse = on_off ? 1 : 0;
1895 break;
1896 case 25: /* Cursor on/off */
1897 vc->vc_deccm = on_off;
1898 break;
1899 case 1000:
1900 vc->vc_report_mouse = on_off ? 2 : 0;
1901 break;
1902 }
1903 } else {
1904 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1905 case 3: /* Monitor (display ctrls) */
1906 vc->vc_disp_ctrl = on_off;
1907 break;
1908 case 4: /* Insert Mode on/off */
1909 vc->vc_decim = on_off;
1910 break;
1911 case 20: /* Lf, Enter == CrLf/Lf */
1912 if (on_off)
1913 set_kbd(vc, lnm);
1914 else
1915 clr_kbd(vc, lnm);
1916 break;
1917 }
1918 }
1919 }
1920
1921 /* console_lock is held */
1922 static void setterm_command(struct vc_data *vc)
1923 {
1924 switch(vc->vc_par[0]) {
1925 case 1: /* set color for underline mode */
1926 if (vc->vc_can_do_color &&
1927 vc->vc_par[1] < 16) {
1928 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1929 if (vc->vc_underline)
1930 update_attr(vc);
1931 }
1932 break;
1933 case 2: /* set color for half intensity mode */
1934 if (vc->vc_can_do_color &&
1935 vc->vc_par[1] < 16) {
1936 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1937 if (vc->vc_intensity == 0)
1938 update_attr(vc);
1939 }
1940 break;
1941 case 8: /* store colors as defaults */
1942 vc->vc_def_color = vc->vc_attr;
1943 if (vc->vc_hi_font_mask == 0x100)
1944 vc->vc_def_color >>= 1;
1945 default_attr(vc);
1946 update_attr(vc);
1947 break;
1948 case 9: /* set blanking interval */
1949 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1950 poke_blanked_console();
1951 break;
1952 case 10: /* set bell frequency in Hz */
1953 if (vc->vc_npar >= 1)
1954 vc->vc_bell_pitch = vc->vc_par[1];
1955 else
1956 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1957 break;
1958 case 11: /* set bell duration in msec */
1959 if (vc->vc_npar >= 1)
1960 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1961 msecs_to_jiffies(vc->vc_par[1]) : 0;
1962 else
1963 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1964 break;
1965 case 12: /* bring specified console to the front */
1966 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1967 set_console(vc->vc_par[1] - 1);
1968 break;
1969 case 13: /* unblank the screen */
1970 poke_blanked_console();
1971 break;
1972 case 14: /* set vesa powerdown interval */
1973 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1974 break;
1975 case 15: /* activate the previous console */
1976 set_console(last_console);
1977 break;
1978 case 16: /* set cursor blink duration in msec */
1979 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1980 vc->vc_par[1] <= USHRT_MAX)
1981 vc->vc_cur_blink_ms = vc->vc_par[1];
1982 else
1983 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1984 break;
1985 }
1986 }
1987
1988 /* console_lock is held */
1989 static void csi_at(struct vc_data *vc, unsigned int nr)
1990 {
1991 if (nr > vc->vc_cols - vc->vc_x)
1992 nr = vc->vc_cols - vc->vc_x;
1993 else if (!nr)
1994 nr = 1;
1995 insert_char(vc, nr);
1996 }
1997
1998 /* console_lock is held */
1999 static void csi_L(struct vc_data *vc, unsigned int nr)
2000 {
2001 if (nr > vc->vc_rows - vc->vc_y)
2002 nr = vc->vc_rows - vc->vc_y;
2003 else if (!nr)
2004 nr = 1;
2005 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
2006 vc->vc_need_wrap = 0;
2007 }
2008
2009 /* console_lock is held */
2010 static void csi_P(struct vc_data *vc, unsigned int nr)
2011 {
2012 if (nr > vc->vc_cols - vc->vc_x)
2013 nr = vc->vc_cols - vc->vc_x;
2014 else if (!nr)
2015 nr = 1;
2016 delete_char(vc, nr);
2017 }
2018
2019 /* console_lock is held */
2020 static void csi_M(struct vc_data *vc, unsigned int nr)
2021 {
2022 if (nr > vc->vc_rows - vc->vc_y)
2023 nr = vc->vc_rows - vc->vc_y;
2024 else if (!nr)
2025 nr=1;
2026 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
2027 vc->vc_need_wrap = 0;
2028 }
2029
2030 /* console_lock is held (except via vc_init->reset_terminal */
2031 static void save_cur(struct vc_data *vc)
2032 {
2033 vc->vc_saved_x = vc->vc_x;
2034 vc->vc_saved_y = vc->vc_y;
2035 vc->vc_s_intensity = vc->vc_intensity;
2036 vc->vc_s_italic = vc->vc_italic;
2037 vc->vc_s_underline = vc->vc_underline;
2038 vc->vc_s_blink = vc->vc_blink;
2039 vc->vc_s_reverse = vc->vc_reverse;
2040 vc->vc_s_charset = vc->vc_charset;
2041 vc->vc_s_color = vc->vc_color;
2042 vc->vc_saved_G0 = vc->vc_G0_charset;
2043 vc->vc_saved_G1 = vc->vc_G1_charset;
2044 }
2045
2046 /* console_lock is held */
2047 static void restore_cur(struct vc_data *vc)
2048 {
2049 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
2050 vc->vc_intensity = vc->vc_s_intensity;
2051 vc->vc_italic = vc->vc_s_italic;
2052 vc->vc_underline = vc->vc_s_underline;
2053 vc->vc_blink = vc->vc_s_blink;
2054 vc->vc_reverse = vc->vc_s_reverse;
2055 vc->vc_charset = vc->vc_s_charset;
2056 vc->vc_color = vc->vc_s_color;
2057 vc->vc_G0_charset = vc->vc_saved_G0;
2058 vc->vc_G1_charset = vc->vc_saved_G1;
2059 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
2060 update_attr(vc);
2061 vc->vc_need_wrap = 0;
2062 }
2063
2064 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2065 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
2066 ESpalette, ESosc };
2067
2068 /* console_lock is held (except via vc_init()) */
2069 static void reset_terminal(struct vc_data *vc, int do_clear)
2070 {
2071 vc->vc_top = 0;
2072 vc->vc_bottom = vc->vc_rows;
2073 vc->vc_state = ESnormal;
2074 vc->vc_ques = 0;
2075 vc->vc_translate = set_translate(LAT1_MAP, vc);
2076 vc->vc_G0_charset = LAT1_MAP;
2077 vc->vc_G1_charset = GRAF_MAP;
2078 vc->vc_charset = 0;
2079 vc->vc_need_wrap = 0;
2080 vc->vc_report_mouse = 0;
2081 vc->vc_utf = default_utf8;
2082 vc->vc_utf_count = 0;
2083
2084 vc->vc_disp_ctrl = 0;
2085 vc->vc_toggle_meta = 0;
2086
2087 vc->vc_decscnm = 0;
2088 vc->vc_decom = 0;
2089 vc->vc_decawm = 1;
2090 vc->vc_deccm = global_cursor_default;
2091 vc->vc_decim = 0;
2092
2093 vt_reset_keyboard(vc->vc_num);
2094
2095 vc->vc_cursor_type = cur_default;
2096 vc->vc_complement_mask = vc->vc_s_complement_mask;
2097
2098 default_attr(vc);
2099 update_attr(vc);
2100
2101 vc->vc_tab_stop[0] =
2102 vc->vc_tab_stop[1] =
2103 vc->vc_tab_stop[2] =
2104 vc->vc_tab_stop[3] =
2105 vc->vc_tab_stop[4] =
2106 vc->vc_tab_stop[5] =
2107 vc->vc_tab_stop[6] =
2108 vc->vc_tab_stop[7] = 0x01010101;
2109
2110 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2111 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2112 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2113
2114 gotoxy(vc, 0, 0);
2115 save_cur(vc);
2116 if (do_clear)
2117 csi_J(vc, 2);
2118 }
2119
2120 /* console_lock is held */
2121 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2122 {
2123 /*
2124 * Control characters can be used in the _middle_
2125 * of an escape sequence.
2126 */
2127 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2128 return;
2129 switch (c) {
2130 case 0:
2131 return;
2132 case 7:
2133 if (vc->vc_state == ESosc)
2134 vc->vc_state = ESnormal;
2135 else if (vc->vc_bell_duration)
2136 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2137 return;
2138 case 8:
2139 bs(vc);
2140 return;
2141 case 9:
2142 vc->vc_pos -= (vc->vc_x << 1);
2143 while (vc->vc_x < vc->vc_cols - 1) {
2144 vc->vc_x++;
2145 if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
2146 break;
2147 }
2148 vc->vc_pos += (vc->vc_x << 1);
2149 notify_write(vc, '\t');
2150 return;
2151 case 10: case 11: case 12:
2152 lf(vc);
2153 if (!is_kbd(vc, lnm))
2154 return;
2155 case 13:
2156 cr(vc);
2157 return;
2158 case 14:
2159 vc->vc_charset = 1;
2160 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2161 vc->vc_disp_ctrl = 1;
2162 return;
2163 case 15:
2164 vc->vc_charset = 0;
2165 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2166 vc->vc_disp_ctrl = 0;
2167 return;
2168 case 24: case 26:
2169 vc->vc_state = ESnormal;
2170 return;
2171 case 27:
2172 vc->vc_state = ESesc;
2173 return;
2174 case 127:
2175 del(vc);
2176 return;
2177 case 128+27:
2178 vc->vc_state = ESsquare;
2179 return;
2180 }
2181 switch(vc->vc_state) {
2182 case ESesc:
2183 vc->vc_state = ESnormal;
2184 switch (c) {
2185 case '[':
2186 vc->vc_state = ESsquare;
2187 return;
2188 case ']':
2189 vc->vc_state = ESnonstd;
2190 return;
2191 case '%':
2192 vc->vc_state = ESpercent;
2193 return;
2194 case 'E':
2195 cr(vc);
2196 lf(vc);
2197 return;
2198 case 'M':
2199 ri(vc);
2200 return;
2201 case 'D':
2202 lf(vc);
2203 return;
2204 case 'H':
2205 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
2206 return;
2207 case 'Z':
2208 respond_ID(tty);
2209 return;
2210 case '7':
2211 save_cur(vc);
2212 return;
2213 case '8':
2214 restore_cur(vc);
2215 return;
2216 case '(':
2217 vc->vc_state = ESsetG0;
2218 return;
2219 case ')':
2220 vc->vc_state = ESsetG1;
2221 return;
2222 case '#':
2223 vc->vc_state = EShash;
2224 return;
2225 case 'c':
2226 reset_terminal(vc, 1);
2227 return;
2228 case '>': /* Numeric keypad */
2229 clr_kbd(vc, kbdapplic);
2230 return;
2231 case '=': /* Appl. keypad */
2232 set_kbd(vc, kbdapplic);
2233 return;
2234 }
2235 return;
2236 case ESnonstd:
2237 if (c=='P') { /* palette escape sequence */
2238 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2239 vc->vc_par[vc->vc_npar] = 0;
2240 vc->vc_npar = 0;
2241 vc->vc_state = ESpalette;
2242 return;
2243 } else if (c=='R') { /* reset palette */
2244 reset_palette(vc);
2245 vc->vc_state = ESnormal;
2246 } else if (c>='0' && c<='9')
2247 vc->vc_state = ESosc;
2248 else
2249 vc->vc_state = ESnormal;
2250 return;
2251 case ESpalette:
2252 if (isxdigit(c)) {
2253 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2254 if (vc->vc_npar == 7) {
2255 int i = vc->vc_par[0] * 3, j = 1;
2256 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2257 vc->vc_palette[i++] += vc->vc_par[j++];
2258 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2259 vc->vc_palette[i++] += vc->vc_par[j++];
2260 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2261 vc->vc_palette[i] += vc->vc_par[j];
2262 set_palette(vc);
2263 vc->vc_state = ESnormal;
2264 }
2265 } else
2266 vc->vc_state = ESnormal;
2267 return;
2268 case ESsquare:
2269 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2270 vc->vc_par[vc->vc_npar] = 0;
2271 vc->vc_npar = 0;
2272 vc->vc_state = ESgetpars;
2273 if (c == '[') { /* Function key */
2274 vc->vc_state=ESfunckey;
2275 return;
2276 }
2277 vc->vc_ques = (c == '?');
2278 if (vc->vc_ques)
2279 return;
2280 case ESgetpars:
2281 if (c == ';' && vc->vc_npar < NPAR - 1) {
2282 vc->vc_npar++;
2283 return;
2284 } else if (c>='0' && c<='9') {
2285 vc->vc_par[vc->vc_npar] *= 10;
2286 vc->vc_par[vc->vc_npar] += c - '0';
2287 return;
2288 }
2289 vc->vc_state = ESnormal;
2290 switch(c) {
2291 case 'h':
2292 set_mode(vc, 1);
2293 return;
2294 case 'l':
2295 set_mode(vc, 0);
2296 return;
2297 case 'c':
2298 if (vc->vc_ques) {
2299 if (vc->vc_par[0])
2300 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
2301 else
2302 vc->vc_cursor_type = cur_default;
2303 return;
2304 }
2305 break;
2306 case 'm':
2307 if (vc->vc_ques) {
2308 clear_selection();
2309 if (vc->vc_par[0])
2310 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2311 else
2312 vc->vc_complement_mask = vc->vc_s_complement_mask;
2313 return;
2314 }
2315 break;
2316 case 'n':
2317 if (!vc->vc_ques) {
2318 if (vc->vc_par[0] == 5)
2319 status_report(tty);
2320 else if (vc->vc_par[0] == 6)
2321 cursor_report(vc, tty);
2322 }
2323 return;
2324 }
2325 if (vc->vc_ques) {
2326 vc->vc_ques = 0;
2327 return;
2328 }
2329 switch(c) {
2330 case 'G': case '`':
2331 if (vc->vc_par[0])
2332 vc->vc_par[0]--;
2333 gotoxy(vc, vc->vc_par[0], vc->vc_y);
2334 return;
2335 case 'A':
2336 if (!vc->vc_par[0])
2337 vc->vc_par[0]++;
2338 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2339 return;
2340 case 'B': case 'e':
2341 if (!vc->vc_par[0])
2342 vc->vc_par[0]++;
2343 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2344 return;
2345 case 'C': case 'a':
2346 if (!vc->vc_par[0])
2347 vc->vc_par[0]++;
2348 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2349 return;
2350 case 'D':
2351 if (!vc->vc_par[0])
2352 vc->vc_par[0]++;
2353 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2354 return;
2355 case 'E':
2356 if (!vc->vc_par[0])
2357 vc->vc_par[0]++;
2358 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2359 return;
2360 case 'F':
2361 if (!vc->vc_par[0])
2362 vc->vc_par[0]++;
2363 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2364 return;
2365 case 'd':
2366 if (vc->vc_par[0])
2367 vc->vc_par[0]--;
2368 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2369 return;
2370 case 'H': case 'f':
2371 if (vc->vc_par[0])
2372 vc->vc_par[0]--;
2373 if (vc->vc_par[1])
2374 vc->vc_par[1]--;
2375 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2376 return;
2377 case 'J':
2378 csi_J(vc, vc->vc_par[0]);
2379 return;
2380 case 'K':
2381 csi_K(vc, vc->vc_par[0]);
2382 return;
2383 case 'L':
2384 csi_L(vc, vc->vc_par[0]);
2385 return;
2386 case 'M':
2387 csi_M(vc, vc->vc_par[0]);
2388 return;
2389 case 'P':
2390 csi_P(vc, vc->vc_par[0]);
2391 return;
2392 case 'c':
2393 if (!vc->vc_par[0])
2394 respond_ID(tty);
2395 return;
2396 case 'g':
2397 if (!vc->vc_par[0])
2398 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2399 else if (vc->vc_par[0] == 3) {
2400 vc->vc_tab_stop[0] =
2401 vc->vc_tab_stop[1] =
2402 vc->vc_tab_stop[2] =
2403 vc->vc_tab_stop[3] =
2404 vc->vc_tab_stop[4] =
2405 vc->vc_tab_stop[5] =
2406 vc->vc_tab_stop[6] =
2407 vc->vc_tab_stop[7] = 0;
2408 }
2409 return;
2410 case 'm':
2411 csi_m(vc);
2412 return;
2413 case 'q': /* DECLL - but only 3 leds */
2414 /* map 0,1,2,3 to 0,1,2,4 */
2415 if (vc->vc_par[0] < 4)
2416 vt_set_led_state(vc->vc_num,
2417 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2418 return;
2419 case 'r':
2420 if (!vc->vc_par[0])
2421 vc->vc_par[0]++;
2422 if (!vc->vc_par[1])
2423 vc->vc_par[1] = vc->vc_rows;
2424 /* Minimum allowed region is 2 lines */
2425 if (vc->vc_par[0] < vc->vc_par[1] &&
2426 vc->vc_par[1] <= vc->vc_rows) {
2427 vc->vc_top = vc->vc_par[0] - 1;
2428 vc->vc_bottom = vc->vc_par[1];
2429 gotoxay(vc, 0, 0);
2430 }
2431 return;
2432 case 's':
2433 save_cur(vc);
2434 return;
2435 case 'u':
2436 restore_cur(vc);
2437 return;
2438 case 'X':
2439 csi_X(vc, vc->vc_par[0]);
2440 return;
2441 case '@':
2442 csi_at(vc, vc->vc_par[0]);
2443 return;
2444 case ']': /* setterm functions */
2445 setterm_command(vc);
2446 return;
2447 }
2448 return;
2449 case ESpercent:
2450 vc->vc_state = ESnormal;
2451 switch (c) {
2452 case '@': /* defined in ISO 2022 */
2453 vc->vc_utf = 0;
2454 return;
2455 case 'G': /* prelim official escape code */
2456 case '8': /* retained for compatibility */
2457 vc->vc_utf = 1;
2458 return;
2459 }
2460 return;
2461 case ESfunckey:
2462 vc->vc_state = ESnormal;
2463 return;
2464 case EShash:
2465 vc->vc_state = ESnormal;
2466 if (c == '8') {
2467 /* DEC screen alignment test. kludge :-) */
2468 vc->vc_video_erase_char =
2469 (vc->vc_video_erase_char & 0xff00) | 'E';
2470 csi_J(vc, 2);
2471 vc->vc_video_erase_char =
2472 (vc->vc_video_erase_char & 0xff00) | ' ';
2473 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2474 }
2475 return;
2476 case ESsetG0:
2477 if (c == '0')
2478 vc->vc_G0_charset = GRAF_MAP;
2479 else if (c == 'B')
2480 vc->vc_G0_charset = LAT1_MAP;
2481 else if (c == 'U')
2482 vc->vc_G0_charset = IBMPC_MAP;
2483 else if (c == 'K')
2484 vc->vc_G0_charset = USER_MAP;
2485 if (vc->vc_charset == 0)
2486 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2487 vc->vc_state = ESnormal;
2488 return;
2489 case ESsetG1:
2490 if (c == '0')
2491 vc->vc_G1_charset = GRAF_MAP;
2492 else if (c == 'B')
2493 vc->vc_G1_charset = LAT1_MAP;
2494 else if (c == 'U')
2495 vc->vc_G1_charset = IBMPC_MAP;
2496 else if (c == 'K')
2497 vc->vc_G1_charset = USER_MAP;
2498 if (vc->vc_charset == 1)
2499 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2500 vc->vc_state = ESnormal;
2501 return;
2502 case ESosc:
2503 return;
2504 default:
2505 vc->vc_state = ESnormal;
2506 }
2507 }
2508
2509 /* is_double_width() is based on the wcwidth() implementation by
2510 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2511 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2512 */
2513 struct interval {
2514 uint32_t first;
2515 uint32_t last;
2516 };
2517
2518 static int ucs_cmp(const void *key, const void *elt)
2519 {
2520 uint32_t ucs = *(uint32_t *)key;
2521 struct interval e = *(struct interval *) elt;
2522
2523 if (ucs > e.last)
2524 return 1;
2525 else if (ucs < e.first)
2526 return -1;
2527 return 0;
2528 }
2529
2530 static int is_double_width(uint32_t ucs)
2531 {
2532 static const struct interval double_width[] = {
2533 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2534 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2535 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2536 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2537 };
2538 if (ucs < double_width[0].first ||
2539 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2540 return 0;
2541
2542 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2543 sizeof(struct interval), ucs_cmp) != NULL;
2544 }
2545
2546 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2547 unsigned long draw_to, int *draw_x)
2548 {
2549 if (*draw_x < 0)
2550 return;
2551
2552 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2553 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2554 *draw_x = -1;
2555 }
2556
2557 /* acquires console_lock */
2558 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2559 {
2560 int c, next_c, tc, ok, n = 0, draw_x = -1;
2561 unsigned int currcons;
2562 unsigned long draw_from = 0, draw_to = 0;
2563 struct vc_data *vc;
2564 unsigned char vc_attr;
2565 struct vt_notifier_param param;
2566 uint8_t rescan;
2567 uint8_t inverse;
2568 uint8_t width;
2569 u16 himask, charmask;
2570
2571 if (in_interrupt())
2572 return count;
2573
2574 might_sleep();
2575
2576 console_lock();
2577 vc = tty->driver_data;
2578 if (vc == NULL) {
2579 pr_err("vt: argh, driver_data is NULL !\n");
2580 console_unlock();
2581 return 0;
2582 }
2583
2584 currcons = vc->vc_num;
2585 if (!vc_cons_allocated(currcons)) {
2586 /* could this happen? */
2587 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2588 console_unlock();
2589 return 0;
2590 }
2591
2592 himask = vc->vc_hi_font_mask;
2593 charmask = himask ? 0x1ff : 0xff;
2594
2595 /* undraw cursor first */
2596 if (con_is_fg(vc))
2597 hide_cursor(vc);
2598
2599 param.vc = vc;
2600
2601 while (!tty->stopped && count) {
2602 int orig = *buf;
2603 c = orig;
2604 buf++;
2605 n++;
2606 count--;
2607 rescan = 0;
2608 inverse = 0;
2609 width = 1;
2610
2611 /* Do no translation at all in control states */
2612 if (vc->vc_state != ESnormal) {
2613 tc = c;
2614 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2615 /* Combine UTF-8 into Unicode in vc_utf_char.
2616 * vc_utf_count is the number of continuation bytes still
2617 * expected to arrive.
2618 * vc_npar is the number of continuation bytes arrived so
2619 * far
2620 */
2621 rescan_last_byte:
2622 if ((c & 0xc0) == 0x80) {
2623 /* Continuation byte received */
2624 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2625 if (vc->vc_utf_count) {
2626 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2627 vc->vc_npar++;
2628 if (--vc->vc_utf_count) {
2629 /* Still need some bytes */
2630 continue;
2631 }
2632 /* Got a whole character */
2633 c = vc->vc_utf_char;
2634 /* Reject overlong sequences */
2635 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2636 c > utf8_length_changes[vc->vc_npar])
2637 c = 0xfffd;
2638 } else {
2639 /* Unexpected continuation byte */
2640 vc->vc_utf_count = 0;
2641 c = 0xfffd;
2642 }
2643 } else {
2644 /* Single ASCII byte or first byte of a sequence received */
2645 if (vc->vc_utf_count) {
2646 /* Continuation byte expected */
2647 rescan = 1;
2648 vc->vc_utf_count = 0;
2649 c = 0xfffd;
2650 } else if (c > 0x7f) {
2651 /* First byte of a multibyte sequence received */
2652 vc->vc_npar = 0;
2653 if ((c & 0xe0) == 0xc0) {
2654 vc->vc_utf_count = 1;
2655 vc->vc_utf_char = (c & 0x1f);
2656 } else if ((c & 0xf0) == 0xe0) {
2657 vc->vc_utf_count = 2;
2658 vc->vc_utf_char = (c & 0x0f);
2659 } else if ((c & 0xf8) == 0xf0) {
2660 vc->vc_utf_count = 3;
2661 vc->vc_utf_char = (c & 0x07);
2662 } else if ((c & 0xfc) == 0xf8) {
2663 vc->vc_utf_count = 4;
2664 vc->vc_utf_char = (c & 0x03);
2665 } else if ((c & 0xfe) == 0xfc) {
2666 vc->vc_utf_count = 5;
2667 vc->vc_utf_char = (c & 0x01);
2668 } else {
2669 /* 254 and 255 are invalid */
2670 c = 0xfffd;
2671 }
2672 if (vc->vc_utf_count) {
2673 /* Still need some bytes */
2674 continue;
2675 }
2676 }
2677 /* Nothing to do if an ASCII byte was received */
2678 }
2679 /* End of UTF-8 decoding. */
2680 /* c is the received character, or U+FFFD for invalid sequences. */
2681 /* Replace invalid Unicode code points with U+FFFD too */
2682 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2683 c = 0xfffd;
2684 tc = c;
2685 } else { /* no utf or alternate charset mode */
2686 tc = vc_translate(vc, c);
2687 }
2688
2689 param.c = tc;
2690 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2691 &param) == NOTIFY_STOP)
2692 continue;
2693
2694 /* If the original code was a control character we
2695 * only allow a glyph to be displayed if the code is
2696 * not normally used (such as for cursor movement) or
2697 * if the disp_ctrl mode has been explicitly enabled.
2698 * Certain characters (as given by the CTRL_ALWAYS
2699 * bitmap) are always displayed as control characters,
2700 * as the console would be pretty useless without
2701 * them; to display an arbitrary font position use the
2702 * direct-to-font zone in UTF-8 mode.
2703 */
2704 ok = tc && (c >= 32 ||
2705 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2706 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2707 && (c != 127 || vc->vc_disp_ctrl)
2708 && (c != 128+27);
2709
2710 if (vc->vc_state == ESnormal && ok) {
2711 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2712 if (is_double_width(c))
2713 width = 2;
2714 }
2715 /* Now try to find out how to display it */
2716 tc = conv_uni_to_pc(vc, tc);
2717 if (tc & ~charmask) {
2718 if (tc == -1 || tc == -2) {
2719 continue; /* nothing to display */
2720 }
2721 /* Glyph not found */
2722 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2723 /* In legacy mode use the glyph we get by a 1:1 mapping.
2724 This would make absolutely no sense with Unicode in mind,
2725 but do this for ASCII characters since a font may lack
2726 Unicode mapping info and we don't want to end up with
2727 having question marks only. */
2728 tc = c;
2729 } else {
2730 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2731 tc = conv_uni_to_pc(vc, 0xfffd);
2732 if (tc < 0) {
2733 inverse = 1;
2734 tc = conv_uni_to_pc(vc, '?');
2735 if (tc < 0) tc = '?';
2736 }
2737 }
2738 }
2739
2740 if (!inverse) {
2741 vc_attr = vc->vc_attr;
2742 } else {
2743 /* invert vc_attr */
2744 if (!vc->vc_can_do_color) {
2745 vc_attr = (vc->vc_attr) ^ 0x08;
2746 } else if (vc->vc_hi_font_mask == 0x100) {
2747 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2748 } else {
2749 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2750 }
2751 con_flush(vc, draw_from, draw_to, &draw_x);
2752 }
2753
2754 next_c = c;
2755 while (1) {
2756 if (vc->vc_need_wrap || vc->vc_decim)
2757 con_flush(vc, draw_from, draw_to,
2758 &draw_x);
2759 if (vc->vc_need_wrap) {
2760 cr(vc);
2761 lf(vc);
2762 }
2763 if (vc->vc_decim)
2764 insert_char(vc, 1);
2765 vc_uniscr_putc(vc, next_c);
2766 scr_writew(himask ?
2767 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2768 (vc_attr << 8) + tc,
2769 (u16 *) vc->vc_pos);
2770 if (con_should_update(vc) && draw_x < 0) {
2771 draw_x = vc->vc_x;
2772 draw_from = vc->vc_pos;
2773 }
2774 if (vc->vc_x == vc->vc_cols - 1) {
2775 vc->vc_need_wrap = vc->vc_decawm;
2776 draw_to = vc->vc_pos + 2;
2777 } else {
2778 vc->vc_x++;
2779 draw_to = (vc->vc_pos += 2);
2780 }
2781
2782 if (!--width) break;
2783
2784 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2785 if (tc < 0) tc = ' ';
2786 next_c = ' ';
2787 }
2788 notify_write(vc, c);
2789
2790 if (inverse)
2791 con_flush(vc, draw_from, draw_to, &draw_x);
2792
2793 if (rescan) {
2794 rescan = 0;
2795 inverse = 0;
2796 width = 1;
2797 c = orig;
2798 goto rescan_last_byte;
2799 }
2800 continue;
2801 }
2802 con_flush(vc, draw_from, draw_to, &draw_x);
2803 do_con_trol(tty, vc, orig);
2804 }
2805 con_flush(vc, draw_from, draw_to, &draw_x);
2806 vc_uniscr_debug_check(vc);
2807 console_conditional_schedule();
2808 notify_update(vc);
2809 console_unlock();
2810 return n;
2811 }
2812
2813 /*
2814 * This is the console switching callback.
2815 *
2816 * Doing console switching in a process context allows
2817 * us to do the switches asynchronously (needed when we want
2818 * to switch due to a keyboard interrupt). Synchronization
2819 * with other console code and prevention of re-entrancy is
2820 * ensured with console_lock.
2821 */
2822 static void console_callback(struct work_struct *ignored)
2823 {
2824 console_lock();
2825
2826 if (want_console >= 0) {
2827 if (want_console != fg_console &&
2828 vc_cons_allocated(want_console)) {
2829 hide_cursor(vc_cons[fg_console].d);
2830 change_console(vc_cons[want_console].d);
2831 /* we only changed when the console had already
2832 been allocated - a new console is not created
2833 in an interrupt routine */
2834 }
2835 want_console = -1;
2836 }
2837 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2838 do_poke_blanked_console = 0;
2839 poke_blanked_console();
2840 }
2841 if (scrollback_delta) {
2842 struct vc_data *vc = vc_cons[fg_console].d;
2843 clear_selection();
2844 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2845 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2846 scrollback_delta = 0;
2847 }
2848 if (blank_timer_expired) {
2849 do_blank_screen(0);
2850 blank_timer_expired = 0;
2851 }
2852 notify_update(vc_cons[fg_console].d);
2853
2854 console_unlock();
2855 }
2856
2857 int set_console(int nr)
2858 {
2859 struct vc_data *vc = vc_cons[fg_console].d;
2860
2861 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2862 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2863
2864 /*
2865 * Console switch will fail in console_callback() or
2866 * change_console() so there is no point scheduling
2867 * the callback
2868 *
2869 * Existing set_console() users don't check the return
2870 * value so this shouldn't break anything
2871 */
2872 return -EINVAL;
2873 }
2874
2875 want_console = nr;
2876 schedule_console_callback();
2877
2878 return 0;
2879 }
2880
2881 struct tty_driver *console_driver;
2882
2883 #ifdef CONFIG_VT_CONSOLE
2884
2885 /**
2886 * vt_kmsg_redirect() - Sets/gets the kernel message console
2887 * @new: The new virtual terminal number or -1 if the console should stay
2888 * unchanged
2889 *
2890 * By default, the kernel messages are always printed on the current virtual
2891 * console. However, the user may modify that default with the
2892 * TIOCL_SETKMSGREDIRECT ioctl call.
2893 *
2894 * This function sets the kernel message console to be @new. It returns the old
2895 * virtual console number. The virtual terminal number 0 (both as parameter and
2896 * return value) means no redirection (i.e. always printed on the currently
2897 * active console).
2898 *
2899 * The parameter -1 means that only the current console is returned, but the
2900 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2901 * case to make the code more understandable.
2902 *
2903 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2904 * the parameter and always returns 0.
2905 */
2906 int vt_kmsg_redirect(int new)
2907 {
2908 static int kmsg_con;
2909
2910 if (new != -1)
2911 return xchg(&kmsg_con, new);
2912 else
2913 return kmsg_con;
2914 }
2915
2916 /*
2917 * Console on virtual terminal
2918 *
2919 * The console must be locked when we get here.
2920 */
2921
2922 static void vt_console_print(struct console *co, const char *b, unsigned count)
2923 {
2924 struct vc_data *vc = vc_cons[fg_console].d;
2925 unsigned char c;
2926 static DEFINE_SPINLOCK(printing_lock);
2927 const ushort *start;
2928 ushort start_x, cnt;
2929 int kmsg_console;
2930
2931 /* console busy or not yet initialized */
2932 if (!printable)
2933 return;
2934 if (!spin_trylock(&printing_lock))
2935 return;
2936
2937 kmsg_console = vt_get_kmsg_redirect();
2938 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2939 vc = vc_cons[kmsg_console - 1].d;
2940
2941 if (!vc_cons_allocated(fg_console)) {
2942 /* impossible */
2943 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2944 goto quit;
2945 }
2946
2947 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2948 goto quit;
2949
2950 /* undraw cursor first */
2951 if (con_is_fg(vc))
2952 hide_cursor(vc);
2953
2954 start = (ushort *)vc->vc_pos;
2955 start_x = vc->vc_x;
2956 cnt = 0;
2957 while (count--) {
2958 c = *b++;
2959 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2960 if (cnt && con_is_visible(vc))
2961 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2962 cnt = 0;
2963 if (c == 8) { /* backspace */
2964 bs(vc);
2965 start = (ushort *)vc->vc_pos;
2966 start_x = vc->vc_x;
2967 continue;
2968 }
2969 if (c != 13)
2970 lf(vc);
2971 cr(vc);
2972 start = (ushort *)vc->vc_pos;
2973 start_x = vc->vc_x;
2974 if (c == 10 || c == 13)
2975 continue;
2976 }
2977 vc_uniscr_putc(vc, c);
2978 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2979 notify_write(vc, c);
2980 cnt++;
2981 if (vc->vc_x == vc->vc_cols - 1) {
2982 vc->vc_need_wrap = 1;
2983 } else {
2984 vc->vc_pos += 2;
2985 vc->vc_x++;
2986 }
2987 }
2988 if (cnt && con_is_visible(vc))
2989 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2990 set_cursor(vc);
2991 notify_update(vc);
2992
2993 quit:
2994 spin_unlock(&printing_lock);
2995 }
2996
2997 static struct tty_driver *vt_console_device(struct console *c, int *index)
2998 {
2999 *index = c->index ? c->index-1 : fg_console;
3000 return console_driver;
3001 }
3002
3003 static struct console vt_console_driver = {
3004 .name = "tty",
3005 .write = vt_console_print,
3006 .device = vt_console_device,
3007 .unblank = unblank_screen,
3008 .flags = CON_PRINTBUFFER,
3009 .index = -1,
3010 };
3011 #endif
3012
3013 /*
3014 * Handling of Linux-specific VC ioctls
3015 */
3016
3017 /*
3018 * Generally a bit racy with respect to console_lock();.
3019 *
3020 * There are some functions which don't need it.
3021 *
3022 * There are some functions which can sleep for arbitrary periods
3023 * (paste_selection) but we don't need the lock there anyway.
3024 *
3025 * set_selection has locking, and definitely needs it
3026 */
3027
3028 int tioclinux(struct tty_struct *tty, unsigned long arg)
3029 {
3030 char type, data;
3031 char __user *p = (char __user *)arg;
3032 int lines;
3033 int ret;
3034
3035 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3036 return -EPERM;
3037 if (get_user(type, p))
3038 return -EFAULT;
3039 ret = 0;
3040
3041 switch (type)
3042 {
3043 case TIOCL_SETSEL:
3044 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
3045 break;
3046 case TIOCL_PASTESEL:
3047 ret = paste_selection(tty);
3048 break;
3049 case TIOCL_UNBLANKSCREEN:
3050 console_lock();
3051 unblank_screen();
3052 console_unlock();
3053 break;
3054 case TIOCL_SELLOADLUT:
3055 console_lock();
3056 ret = sel_loadlut(p);
3057 console_unlock();
3058 break;
3059 case TIOCL_GETSHIFTSTATE:
3060
3061 /*
3062 * Make it possible to react to Shift+Mousebutton.
3063 * Note that 'shift_state' is an undocumented
3064 * kernel-internal variable; programs not closely
3065 * related to the kernel should not use this.
3066 */
3067 data = vt_get_shift_state();
3068 ret = put_user(data, p);
3069 break;
3070 case TIOCL_GETMOUSEREPORTING:
3071 console_lock(); /* May be overkill */
3072 data = mouse_reporting();
3073 console_unlock();
3074 ret = put_user(data, p);
3075 break;
3076 case TIOCL_SETVESABLANK:
3077 console_lock();
3078 ret = set_vesa_blanking(p);
3079 console_unlock();
3080 break;
3081 case TIOCL_GETKMSGREDIRECT:
3082 data = vt_get_kmsg_redirect();
3083 ret = put_user(data, p);
3084 break;
3085 case TIOCL_SETKMSGREDIRECT:
3086 if (!capable(CAP_SYS_ADMIN)) {
3087 ret = -EPERM;
3088 } else {
3089 if (get_user(data, p+1))
3090 ret = -EFAULT;
3091 else
3092 vt_kmsg_redirect(data);
3093 }
3094 break;
3095 case TIOCL_GETFGCONSOLE:
3096 /* No locking needed as this is a transiently
3097 correct return anyway if the caller hasn't
3098 disabled switching */
3099 ret = fg_console;
3100 break;
3101 case TIOCL_SCROLLCONSOLE:
3102 if (get_user(lines, (s32 __user *)(p+4))) {
3103 ret = -EFAULT;
3104 } else {
3105 /* Need the console lock here. Note that lots
3106 of other calls need fixing before the lock
3107 is actually useful ! */
3108 console_lock();
3109 scrollfront(vc_cons[fg_console].d, lines);
3110 console_unlock();
3111 ret = 0;
3112 }
3113 break;
3114 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3115 console_lock();
3116 ignore_poke = 1;
3117 do_blank_screen(0);
3118 console_unlock();
3119 break;
3120 case TIOCL_BLANKEDSCREEN:
3121 ret = console_blanked;
3122 break;
3123 default:
3124 ret = -EINVAL;
3125 break;
3126 }
3127 return ret;
3128 }
3129
3130 /*
3131 * /dev/ttyN handling
3132 */
3133
3134 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3135 {
3136 int retval;
3137
3138 retval = do_con_write(tty, buf, count);
3139 con_flush_chars(tty);
3140
3141 return retval;
3142 }
3143
3144 static int con_put_char(struct tty_struct *tty, unsigned char ch)
3145 {
3146 if (in_interrupt())
3147 return 0; /* n_r3964 calls put_char() from interrupt context */
3148 return do_con_write(tty, &ch, 1);
3149 }
3150
3151 static int con_write_room(struct tty_struct *tty)
3152 {
3153 if (tty->stopped)
3154 return 0;
3155 return 32768; /* No limit, really; we're not buffering */
3156 }
3157
3158 static int con_chars_in_buffer(struct tty_struct *tty)
3159 {
3160 return 0; /* we're not buffering */
3161 }
3162
3163 /*
3164 * con_throttle and con_unthrottle are only used for
3165 * paste_selection(), which has to stuff in a large number of
3166 * characters...
3167 */
3168 static void con_throttle(struct tty_struct *tty)
3169 {
3170 }
3171
3172 static void con_unthrottle(struct tty_struct *tty)
3173 {
3174 struct vc_data *vc = tty->driver_data;
3175
3176 wake_up_interruptible(&vc->paste_wait);
3177 }
3178
3179 /*
3180 * Turn the Scroll-Lock LED on when the tty is stopped
3181 */
3182 static void con_stop(struct tty_struct *tty)
3183 {
3184 int console_num;
3185 if (!tty)
3186 return;
3187 console_num = tty->index;
3188 if (!vc_cons_allocated(console_num))
3189 return;
3190 vt_kbd_con_stop(console_num);
3191 }
3192
3193 /*
3194 * Turn the Scroll-Lock LED off when the console is started
3195 */
3196 static void con_start(struct tty_struct *tty)
3197 {
3198 int console_num;
3199 if (!tty)
3200 return;
3201 console_num = tty->index;
3202 if (!vc_cons_allocated(console_num))
3203 return;
3204 vt_kbd_con_start(console_num);
3205 }
3206
3207 static void con_flush_chars(struct tty_struct *tty)
3208 {
3209 struct vc_data *vc;
3210
3211 if (in_interrupt()) /* from flush_to_ldisc */
3212 return;
3213
3214 /* if we race with con_close(), vt may be null */
3215 console_lock();
3216 vc = tty->driver_data;
3217 if (vc)
3218 set_cursor(vc);
3219 console_unlock();
3220 }
3221
3222 /*
3223 * Allocate the console screen memory.
3224 */
3225 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3226 {
3227 unsigned int currcons = tty->index;
3228 struct vc_data *vc;
3229 int ret;
3230
3231 console_lock();
3232 ret = vc_allocate(currcons);
3233 if (ret)
3234 goto unlock;
3235
3236 vc = vc_cons[currcons].d;
3237
3238 /* Still being freed */
3239 if (vc->port.tty) {
3240 ret = -ERESTARTSYS;
3241 goto unlock;
3242 }
3243
3244 ret = tty_port_install(&vc->port, driver, tty);
3245 if (ret)
3246 goto unlock;
3247
3248 tty->driver_data = vc;
3249 vc->port.tty = tty;
3250 tty_port_get(&vc->port);
3251
3252 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3253 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3254 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3255 }
3256 if (vc->vc_utf)
3257 tty->termios.c_iflag |= IUTF8;
3258 else
3259 tty->termios.c_iflag &= ~IUTF8;
3260 unlock:
3261 console_unlock();
3262 return ret;
3263 }
3264
3265 static int con_open(struct tty_struct *tty, struct file *filp)
3266 {
3267 /* everything done in install */
3268 return 0;
3269 }
3270
3271
3272 static void con_close(struct tty_struct *tty, struct file *filp)
3273 {
3274 /* Nothing to do - we defer to shutdown */
3275 }
3276
3277 static void con_shutdown(struct tty_struct *tty)
3278 {
3279 struct vc_data *vc = tty->driver_data;
3280 BUG_ON(vc == NULL);
3281 console_lock();
3282 vc->port.tty = NULL;
3283 console_unlock();
3284 }
3285
3286 static void con_cleanup(struct tty_struct *tty)
3287 {
3288 struct vc_data *vc = tty->driver_data;
3289
3290 tty_port_put(&vc->port);
3291 }
3292
3293 static int default_color = 7; /* white */
3294 static int default_italic_color = 2; // green (ASCII)
3295 static int default_underline_color = 3; // cyan (ASCII)
3296 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3297 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3298 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3299
3300 static void vc_init(struct vc_data *vc, unsigned int rows,
3301 unsigned int cols, int do_clear)
3302 {
3303 int j, k ;
3304
3305 vc->vc_cols = cols;
3306 vc->vc_rows = rows;
3307 vc->vc_size_row = cols << 1;
3308 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3309
3310 set_origin(vc);
3311 vc->vc_pos = vc->vc_origin;
3312 reset_vc(vc);
3313 for (j=k=0; j<16; j++) {
3314 vc->vc_palette[k++] = default_red[j] ;
3315 vc->vc_palette[k++] = default_grn[j] ;
3316 vc->vc_palette[k++] = default_blu[j] ;
3317 }
3318 vc->vc_def_color = default_color;
3319 vc->vc_ulcolor = default_underline_color;
3320 vc->vc_itcolor = default_italic_color;
3321 vc->vc_halfcolor = 0x08; /* grey */
3322 init_waitqueue_head(&vc->paste_wait);
3323 reset_terminal(vc, do_clear);
3324 }
3325
3326 /*
3327 * This routine initializes console interrupts, and does nothing
3328 * else. If you want the screen to clear, call tty_write with
3329 * the appropriate escape-sequence.
3330 */
3331
3332 static int __init con_init(void)
3333 {
3334 const char *display_desc = NULL;
3335 struct vc_data *vc;
3336 unsigned int currcons = 0, i;
3337
3338 console_lock();
3339
3340 if (conswitchp)
3341 display_desc = conswitchp->con_startup();
3342 if (!display_desc) {
3343 fg_console = 0;
3344 console_unlock();
3345 return 0;
3346 }
3347
3348 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3349 struct con_driver *con_driver = &registered_con_driver[i];
3350
3351 if (con_driver->con == NULL) {
3352 con_driver->con = conswitchp;
3353 con_driver->desc = display_desc;
3354 con_driver->flag = CON_DRIVER_FLAG_INIT;
3355 con_driver->first = 0;
3356 con_driver->last = MAX_NR_CONSOLES - 1;
3357 break;
3358 }
3359 }
3360
3361 for (i = 0; i < MAX_NR_CONSOLES; i++)
3362 con_driver_map[i] = conswitchp;
3363
3364 if (blankinterval) {
3365 blank_state = blank_normal_wait;
3366 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3367 }
3368
3369 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3370 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3371 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3372 tty_port_init(&vc->port);
3373 visual_init(vc, currcons, 1);
3374 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3375 vc_init(vc, vc->vc_rows, vc->vc_cols,
3376 currcons || !vc->vc_sw->con_save_screen);
3377 }
3378 currcons = fg_console = 0;
3379 master_display_fg = vc = vc_cons[currcons].d;
3380 set_origin(vc);
3381 save_screen(vc);
3382 gotoxy(vc, vc->vc_x, vc->vc_y);
3383 csi_J(vc, 0);
3384 update_screen(vc);
3385 pr_info("Console: %s %s %dx%d\n",
3386 vc->vc_can_do_color ? "colour" : "mono",
3387 display_desc, vc->vc_cols, vc->vc_rows);
3388 printable = 1;
3389
3390 console_unlock();
3391
3392 #ifdef CONFIG_VT_CONSOLE
3393 register_console(&vt_console_driver);
3394 #endif
3395 return 0;
3396 }
3397 console_initcall(con_init);
3398
3399 static const struct tty_operations con_ops = {
3400 .install = con_install,
3401 .open = con_open,
3402 .close = con_close,
3403 .write = con_write,
3404 .write_room = con_write_room,
3405 .put_char = con_put_char,
3406 .flush_chars = con_flush_chars,
3407 .chars_in_buffer = con_chars_in_buffer,
3408 .ioctl = vt_ioctl,
3409 #ifdef CONFIG_COMPAT
3410 .compat_ioctl = vt_compat_ioctl,
3411 #endif
3412 .stop = con_stop,
3413 .start = con_start,
3414 .throttle = con_throttle,
3415 .unthrottle = con_unthrottle,
3416 .resize = vt_resize,
3417 .shutdown = con_shutdown,
3418 .cleanup = con_cleanup,
3419 };
3420
3421 static struct cdev vc0_cdev;
3422
3423 static ssize_t show_tty_active(struct device *dev,
3424 struct device_attribute *attr, char *buf)
3425 {
3426 return sprintf(buf, "tty%d\n", fg_console + 1);
3427 }
3428 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3429
3430 static struct attribute *vt_dev_attrs[] = {
3431 &dev_attr_active.attr,
3432 NULL
3433 };
3434
3435 ATTRIBUTE_GROUPS(vt_dev);
3436
3437 int __init vty_init(const struct file_operations *console_fops)
3438 {
3439 cdev_init(&vc0_cdev, console_fops);
3440 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3441 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3442 panic("Couldn't register /dev/tty0 driver\n");
3443 tty0dev = device_create_with_groups(tty_class, NULL,
3444 MKDEV(TTY_MAJOR, 0), NULL,
3445 vt_dev_groups, "tty0");
3446 if (IS_ERR(tty0dev))
3447 tty0dev = NULL;
3448
3449 vcs_init();
3450
3451 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3452 if (!console_driver)
3453 panic("Couldn't allocate console driver\n");
3454
3455 console_driver->name = "tty";
3456 console_driver->name_base = 1;
3457 console_driver->major = TTY_MAJOR;
3458 console_driver->minor_start = 1;
3459 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3460 console_driver->init_termios = tty_std_termios;
3461 if (default_utf8)
3462 console_driver->init_termios.c_iflag |= IUTF8;
3463 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3464 tty_set_operations(console_driver, &con_ops);
3465 if (tty_register_driver(console_driver))
3466 panic("Couldn't register console driver\n");
3467 kbd_init();
3468 console_map_init();
3469 #ifdef CONFIG_MDA_CONSOLE
3470 mda_console_init();
3471 #endif
3472 return 0;
3473 }
3474
3475 #ifndef VT_SINGLE_DRIVER
3476
3477 static struct class *vtconsole_class;
3478
3479 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3480 int deflt)
3481 {
3482 struct module *owner = csw->owner;
3483 const char *desc = NULL;
3484 struct con_driver *con_driver;
3485 int i, j = -1, k = -1, retval = -ENODEV;
3486
3487 if (!try_module_get(owner))
3488 return -ENODEV;
3489
3490 WARN_CONSOLE_UNLOCKED();
3491
3492 /* check if driver is registered */
3493 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3494 con_driver = &registered_con_driver[i];
3495
3496 if (con_driver->con == csw) {
3497 desc = con_driver->desc;
3498 retval = 0;
3499 break;
3500 }
3501 }
3502
3503 if (retval)
3504 goto err;
3505
3506 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3507 csw->con_startup();
3508 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3509 }
3510
3511 if (deflt) {
3512 if (conswitchp)
3513 module_put(conswitchp->owner);
3514
3515 __module_get(owner);
3516 conswitchp = csw;
3517 }
3518
3519 first = max(first, con_driver->first);
3520 last = min(last, con_driver->last);
3521
3522 for (i = first; i <= last; i++) {
3523 int old_was_color;
3524 struct vc_data *vc = vc_cons[i].d;
3525
3526 if (con_driver_map[i])
3527 module_put(con_driver_map[i]->owner);
3528 __module_get(owner);
3529 con_driver_map[i] = csw;
3530
3531 if (!vc || !vc->vc_sw)
3532 continue;
3533
3534 j = i;
3535
3536 if (con_is_visible(vc)) {
3537 k = i;
3538 save_screen(vc);
3539 }
3540
3541 old_was_color = vc->vc_can_do_color;
3542 vc->vc_sw->con_deinit(vc);
3543 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3544 visual_init(vc, i, 0);
3545 set_origin(vc);
3546 update_attr(vc);
3547
3548 /* If the console changed between mono <-> color, then
3549 * the attributes in the screenbuf will be wrong. The
3550 * following resets all attributes to something sane.
3551 */
3552 if (old_was_color != vc->vc_can_do_color)
3553 clear_buffer_attributes(vc);
3554 }
3555
3556 pr_info("Console: switching ");
3557 if (!deflt)
3558 pr_cont("consoles %d-%d ", first + 1, last + 1);
3559 if (j >= 0) {
3560 struct vc_data *vc = vc_cons[j].d;
3561
3562 pr_cont("to %s %s %dx%d\n",
3563 vc->vc_can_do_color ? "colour" : "mono",
3564 desc, vc->vc_cols, vc->vc_rows);
3565
3566 if (k >= 0) {
3567 vc = vc_cons[k].d;
3568 update_screen(vc);
3569 }
3570 } else {
3571 pr_cont("to %s\n", desc);
3572 }
3573
3574 retval = 0;
3575 err:
3576 module_put(owner);
3577 return retval;
3578 };
3579
3580
3581 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3582 /* unlocked version of unbind_con_driver() */
3583 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3584 {
3585 struct module *owner = csw->owner;
3586 const struct consw *defcsw = NULL;
3587 struct con_driver *con_driver = NULL, *con_back = NULL;
3588 int i, retval = -ENODEV;
3589
3590 if (!try_module_get(owner))
3591 return -ENODEV;
3592
3593 WARN_CONSOLE_UNLOCKED();
3594
3595 /* check if driver is registered and if it is unbindable */
3596 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3597 con_driver = &registered_con_driver[i];
3598
3599 if (con_driver->con == csw &&
3600 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3601 retval = 0;
3602 break;
3603 }
3604 }
3605
3606 if (retval)
3607 goto err;
3608
3609 retval = -ENODEV;
3610
3611 /* check if backup driver exists */
3612 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3613 con_back = &registered_con_driver[i];
3614
3615 if (con_back->con && con_back->con != csw) {
3616 defcsw = con_back->con;
3617 retval = 0;
3618 break;
3619 }
3620 }
3621
3622 if (retval)
3623 goto err;
3624
3625 if (!con_is_bound(csw))
3626 goto err;
3627
3628 first = max(first, con_driver->first);
3629 last = min(last, con_driver->last);
3630
3631 for (i = first; i <= last; i++) {
3632 if (con_driver_map[i] == csw) {
3633 module_put(csw->owner);
3634 con_driver_map[i] = NULL;
3635 }
3636 }
3637
3638 if (!con_is_bound(defcsw)) {
3639 const struct consw *defconsw = conswitchp;
3640
3641 defcsw->con_startup();
3642 con_back->flag |= CON_DRIVER_FLAG_INIT;
3643 /*
3644 * vgacon may change the default driver to point
3645 * to dummycon, we restore it here...
3646 */
3647 conswitchp = defconsw;
3648 }
3649
3650 if (!con_is_bound(csw))
3651 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3652
3653 /* ignore return value, binding should not fail */
3654 do_bind_con_driver(defcsw, first, last, deflt);
3655 err:
3656 module_put(owner);
3657 return retval;
3658
3659 }
3660 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3661
3662 static int vt_bind(struct con_driver *con)
3663 {
3664 const struct consw *defcsw = NULL, *csw = NULL;
3665 int i, more = 1, first = -1, last = -1, deflt = 0;
3666
3667 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3668 goto err;
3669
3670 csw = con->con;
3671
3672 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3673 struct con_driver *con = &registered_con_driver[i];
3674
3675 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3676 defcsw = con->con;
3677 break;
3678 }
3679 }
3680
3681 if (!defcsw)
3682 goto err;
3683
3684 while (more) {
3685 more = 0;
3686
3687 for (i = con->first; i <= con->last; i++) {
3688 if (con_driver_map[i] == defcsw) {
3689 if (first == -1)
3690 first = i;
3691 last = i;
3692 more = 1;
3693 } else if (first != -1)
3694 break;
3695 }
3696
3697 if (first == 0 && last == MAX_NR_CONSOLES -1)
3698 deflt = 1;
3699
3700 if (first != -1)
3701 do_bind_con_driver(csw, first, last, deflt);
3702
3703 first = -1;
3704 last = -1;
3705 deflt = 0;
3706 }
3707
3708 err:
3709 return 0;
3710 }
3711
3712 static int vt_unbind(struct con_driver *con)
3713 {
3714 const struct consw *csw = NULL;
3715 int i, more = 1, first = -1, last = -1, deflt = 0;
3716 int ret;
3717
3718 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3719 goto err;
3720
3721 csw = con->con;
3722
3723 while (more) {
3724 more = 0;
3725
3726 for (i = con->first; i <= con->last; i++) {
3727 if (con_driver_map[i] == csw) {
3728 if (first == -1)
3729 first = i;
3730 last = i;
3731 more = 1;
3732 } else if (first != -1)
3733 break;
3734 }
3735
3736 if (first == 0 && last == MAX_NR_CONSOLES -1)
3737 deflt = 1;
3738
3739 if (first != -1) {
3740 ret = do_unbind_con_driver(csw, first, last, deflt);
3741 if (ret != 0)
3742 return ret;
3743 }
3744
3745 first = -1;
3746 last = -1;
3747 deflt = 0;
3748 }
3749
3750 err:
3751 return 0;
3752 }
3753 #else
3754 static inline int vt_bind(struct con_driver *con)
3755 {
3756 return 0;
3757 }
3758 static inline int vt_unbind(struct con_driver *con)
3759 {
3760 return 0;
3761 }
3762 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3763
3764 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3765 const char *buf, size_t count)
3766 {
3767 struct con_driver *con = dev_get_drvdata(dev);
3768 int bind = simple_strtoul(buf, NULL, 0);
3769
3770 console_lock();
3771
3772 if (bind)
3773 vt_bind(con);
3774 else
3775 vt_unbind(con);
3776
3777 console_unlock();
3778
3779 return count;
3780 }
3781
3782 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3783 char *buf)
3784 {
3785 struct con_driver *con = dev_get_drvdata(dev);
3786 int bind = con_is_bound(con->con);
3787
3788 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3789 }
3790
3791 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3792 char *buf)
3793 {
3794 struct con_driver *con = dev_get_drvdata(dev);
3795
3796 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3797 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3798 con->desc);
3799
3800 }
3801
3802 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3803 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3804
3805 static struct attribute *con_dev_attrs[] = {
3806 &dev_attr_bind.attr,
3807 &dev_attr_name.attr,
3808 NULL
3809 };
3810
3811 ATTRIBUTE_GROUPS(con_dev);
3812
3813 static int vtconsole_init_device(struct con_driver *con)
3814 {
3815 con->flag |= CON_DRIVER_FLAG_ATTR;
3816 return 0;
3817 }
3818
3819 static void vtconsole_deinit_device(struct con_driver *con)
3820 {
3821 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3822 }
3823
3824 /**
3825 * con_is_bound - checks if driver is bound to the console
3826 * @csw: console driver
3827 *
3828 * RETURNS: zero if unbound, nonzero if bound
3829 *
3830 * Drivers can call this and if zero, they should release
3831 * all resources allocated on con_startup()
3832 */
3833 int con_is_bound(const struct consw *csw)
3834 {
3835 int i, bound = 0;
3836
3837 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3838 if (con_driver_map[i] == csw) {
3839 bound = 1;
3840 break;
3841 }
3842 }
3843
3844 return bound;
3845 }
3846 EXPORT_SYMBOL(con_is_bound);
3847
3848 /**
3849 * con_debug_enter - prepare the console for the kernel debugger
3850 * @sw: console driver
3851 *
3852 * Called when the console is taken over by the kernel debugger, this
3853 * function needs to save the current console state, then put the console
3854 * into a state suitable for the kernel debugger.
3855 *
3856 * RETURNS:
3857 * Zero on success, nonzero if a failure occurred when trying to prepare
3858 * the console for the debugger.
3859 */
3860 int con_debug_enter(struct vc_data *vc)
3861 {
3862 int ret = 0;
3863
3864 saved_fg_console = fg_console;
3865 saved_last_console = last_console;
3866 saved_want_console = want_console;
3867 saved_vc_mode = vc->vc_mode;
3868 saved_console_blanked = console_blanked;
3869 vc->vc_mode = KD_TEXT;
3870 console_blanked = 0;
3871 if (vc->vc_sw->con_debug_enter)
3872 ret = vc->vc_sw->con_debug_enter(vc);
3873 #ifdef CONFIG_KGDB_KDB
3874 /* Set the initial LINES variable if it is not already set */
3875 if (vc->vc_rows < 999) {
3876 int linecount;
3877 char lns[4];
3878 const char *setargs[3] = {
3879 "set",
3880 "LINES",
3881 lns,
3882 };
3883 if (kdbgetintenv(setargs[0], &linecount)) {
3884 snprintf(lns, 4, "%i", vc->vc_rows);
3885 kdb_set(2, setargs);
3886 }
3887 }
3888 if (vc->vc_cols < 999) {
3889 int colcount;
3890 char cols[4];
3891 const char *setargs[3] = {
3892 "set",
3893 "COLUMNS",
3894 cols,
3895 };
3896 if (kdbgetintenv(setargs[0], &colcount)) {
3897 snprintf(cols, 4, "%i", vc->vc_cols);
3898 kdb_set(2, setargs);
3899 }
3900 }
3901 #endif /* CONFIG_KGDB_KDB */
3902 return ret;
3903 }
3904 EXPORT_SYMBOL_GPL(con_debug_enter);
3905
3906 /**
3907 * con_debug_leave - restore console state
3908 * @sw: console driver
3909 *
3910 * Restore the console state to what it was before the kernel debugger
3911 * was invoked.
3912 *
3913 * RETURNS:
3914 * Zero on success, nonzero if a failure occurred when trying to restore
3915 * the console.
3916 */
3917 int con_debug_leave(void)
3918 {
3919 struct vc_data *vc;
3920 int ret = 0;
3921
3922 fg_console = saved_fg_console;
3923 last_console = saved_last_console;
3924 want_console = saved_want_console;
3925 console_blanked = saved_console_blanked;
3926 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3927
3928 vc = vc_cons[fg_console].d;
3929 if (vc->vc_sw->con_debug_leave)
3930 ret = vc->vc_sw->con_debug_leave(vc);
3931 return ret;
3932 }
3933 EXPORT_SYMBOL_GPL(con_debug_leave);
3934
3935 static int do_register_con_driver(const struct consw *csw, int first, int last)
3936 {
3937 struct module *owner = csw->owner;
3938 struct con_driver *con_driver;
3939 const char *desc;
3940 int i, retval;
3941
3942 WARN_CONSOLE_UNLOCKED();
3943
3944 if (!try_module_get(owner))
3945 return -ENODEV;
3946
3947 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3948 con_driver = &registered_con_driver[i];
3949
3950 /* already registered */
3951 if (con_driver->con == csw) {
3952 retval = -EBUSY;
3953 goto err;
3954 }
3955 }
3956
3957 desc = csw->con_startup();
3958 if (!desc) {
3959 retval = -ENODEV;
3960 goto err;
3961 }
3962
3963 retval = -EINVAL;
3964
3965 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3966 con_driver = &registered_con_driver[i];
3967
3968 if (con_driver->con == NULL &&
3969 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3970 con_driver->con = csw;
3971 con_driver->desc = desc;
3972 con_driver->node = i;
3973 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3974 CON_DRIVER_FLAG_INIT;
3975 con_driver->first = first;
3976 con_driver->last = last;
3977 retval = 0;
3978 break;
3979 }
3980 }
3981
3982 if (retval)
3983 goto err;
3984
3985 con_driver->dev =
3986 device_create_with_groups(vtconsole_class, NULL,
3987 MKDEV(0, con_driver->node),
3988 con_driver, con_dev_groups,
3989 "vtcon%i", con_driver->node);
3990 if (IS_ERR(con_driver->dev)) {
3991 pr_warn("Unable to create device for %s; errno = %ld\n",
3992 con_driver->desc, PTR_ERR(con_driver->dev));
3993 con_driver->dev = NULL;
3994 } else {
3995 vtconsole_init_device(con_driver);
3996 }
3997
3998 err:
3999 module_put(owner);
4000 return retval;
4001 }
4002
4003
4004 /**
4005 * do_unregister_con_driver - unregister console driver from console layer
4006 * @csw: console driver
4007 *
4008 * DESCRIPTION: All drivers that registers to the console layer must
4009 * call this function upon exit, or if the console driver is in a state
4010 * where it won't be able to handle console services, such as the
4011 * framebuffer console without loaded framebuffer drivers.
4012 *
4013 * The driver must unbind first prior to unregistration.
4014 */
4015 int do_unregister_con_driver(const struct consw *csw)
4016 {
4017 int i;
4018
4019 /* cannot unregister a bound driver */
4020 if (con_is_bound(csw))
4021 return -EBUSY;
4022
4023 if (csw == conswitchp)
4024 return -EINVAL;
4025
4026 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4027 struct con_driver *con_driver = &registered_con_driver[i];
4028
4029 if (con_driver->con == csw) {
4030 /*
4031 * Defer the removal of the sysfs entries since that
4032 * will acquire the kernfs s_active lock and we can't
4033 * acquire this lock while holding the console lock:
4034 * the unbind sysfs entry imposes already the opposite
4035 * order. Reset con already here to prevent any later
4036 * lookup to succeed and mark this slot as zombie, so
4037 * it won't get reused until we complete the removal
4038 * in the deferred work.
4039 */
4040 con_driver->con = NULL;
4041 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4042 schedule_work(&con_driver_unregister_work);
4043
4044 return 0;
4045 }
4046 }
4047
4048 return -ENODEV;
4049 }
4050 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4051
4052 static void con_driver_unregister_callback(struct work_struct *ignored)
4053 {
4054 int i;
4055
4056 console_lock();
4057
4058 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4059 struct con_driver *con_driver = &registered_con_driver[i];
4060
4061 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4062 continue;
4063
4064 console_unlock();
4065
4066 vtconsole_deinit_device(con_driver);
4067 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4068
4069 console_lock();
4070
4071 if (WARN_ON_ONCE(con_driver->con))
4072 con_driver->con = NULL;
4073 con_driver->desc = NULL;
4074 con_driver->dev = NULL;
4075 con_driver->node = 0;
4076 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4077 con_driver->flag = 0;
4078 con_driver->first = 0;
4079 con_driver->last = 0;
4080 }
4081
4082 console_unlock();
4083 }
4084
4085 /*
4086 * If we support more console drivers, this function is used
4087 * when a driver wants to take over some existing consoles
4088 * and become default driver for newly opened ones.
4089 *
4090 * do_take_over_console is basically a register followed by unbind
4091 */
4092 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4093 {
4094 int err;
4095
4096 err = do_register_con_driver(csw, first, last);
4097 /*
4098 * If we get an busy error we still want to bind the console driver
4099 * and return success, as we may have unbound the console driver
4100 * but not unregistered it.
4101 */
4102 if (err == -EBUSY)
4103 err = 0;
4104 if (!err)
4105 do_bind_con_driver(csw, first, last, deflt);
4106
4107 return err;
4108 }
4109 EXPORT_SYMBOL_GPL(do_take_over_console);
4110
4111
4112 /*
4113 * give_up_console is a wrapper to unregister_con_driver. It will only
4114 * work if driver is fully unbound.
4115 */
4116 void give_up_console(const struct consw *csw)
4117 {
4118 console_lock();
4119 do_unregister_con_driver(csw);
4120 console_unlock();
4121 }
4122
4123 static int __init vtconsole_class_init(void)
4124 {
4125 int i;
4126
4127 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4128 if (IS_ERR(vtconsole_class)) {
4129 pr_warn("Unable to create vt console class; errno = %ld\n",
4130 PTR_ERR(vtconsole_class));
4131 vtconsole_class = NULL;
4132 }
4133
4134 /* Add system drivers to sysfs */
4135 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4136 struct con_driver *con = &registered_con_driver[i];
4137
4138 if (con->con && !con->dev) {
4139 con->dev =
4140 device_create_with_groups(vtconsole_class, NULL,
4141 MKDEV(0, con->node),
4142 con, con_dev_groups,
4143 "vtcon%i", con->node);
4144
4145 if (IS_ERR(con->dev)) {
4146 pr_warn("Unable to create device for %s; errno = %ld\n",
4147 con->desc, PTR_ERR(con->dev));
4148 con->dev = NULL;
4149 } else {
4150 vtconsole_init_device(con);
4151 }
4152 }
4153 }
4154
4155 return 0;
4156 }
4157 postcore_initcall(vtconsole_class_init);
4158
4159 #endif
4160
4161 /*
4162 * Screen blanking
4163 */
4164
4165 static int set_vesa_blanking(char __user *p)
4166 {
4167 unsigned int mode;
4168
4169 if (get_user(mode, p + 1))
4170 return -EFAULT;
4171
4172 vesa_blank_mode = (mode < 4) ? mode : 0;
4173 return 0;
4174 }
4175
4176 void do_blank_screen(int entering_gfx)
4177 {
4178 struct vc_data *vc = vc_cons[fg_console].d;
4179 int i;
4180
4181 WARN_CONSOLE_UNLOCKED();
4182
4183 if (console_blanked) {
4184 if (blank_state == blank_vesa_wait) {
4185 blank_state = blank_off;
4186 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4187 }
4188 return;
4189 }
4190
4191 /* entering graphics mode? */
4192 if (entering_gfx) {
4193 hide_cursor(vc);
4194 save_screen(vc);
4195 vc->vc_sw->con_blank(vc, -1, 1);
4196 console_blanked = fg_console + 1;
4197 blank_state = blank_off;
4198 set_origin(vc);
4199 return;
4200 }
4201
4202 blank_state = blank_off;
4203
4204 /* don't blank graphics */
4205 if (vc->vc_mode != KD_TEXT) {
4206 console_blanked = fg_console + 1;
4207 return;
4208 }
4209
4210 hide_cursor(vc);
4211 del_timer_sync(&console_timer);
4212 blank_timer_expired = 0;
4213
4214 save_screen(vc);
4215 /* In case we need to reset origin, blanking hook returns 1 */
4216 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4217 console_blanked = fg_console + 1;
4218 if (i)
4219 set_origin(vc);
4220
4221 if (console_blank_hook && console_blank_hook(1))
4222 return;
4223
4224 if (vesa_off_interval && vesa_blank_mode) {
4225 blank_state = blank_vesa_wait;
4226 mod_timer(&console_timer, jiffies + vesa_off_interval);
4227 }
4228 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4229 }
4230 EXPORT_SYMBOL(do_blank_screen);
4231
4232 /*
4233 * Called by timer as well as from vt_console_driver
4234 */
4235 void do_unblank_screen(int leaving_gfx)
4236 {
4237 struct vc_data *vc;
4238
4239 /* This should now always be called from a "sane" (read: can schedule)
4240 * context for the sake of the low level drivers, except in the special
4241 * case of oops_in_progress
4242 */
4243 if (!oops_in_progress)
4244 might_sleep();
4245
4246 WARN_CONSOLE_UNLOCKED();
4247
4248 ignore_poke = 0;
4249 if (!console_blanked)
4250 return;
4251 if (!vc_cons_allocated(fg_console)) {
4252 /* impossible */
4253 pr_warn("unblank_screen: tty %d not allocated ??\n",
4254 fg_console + 1);
4255 return;
4256 }
4257 vc = vc_cons[fg_console].d;
4258 /* Try to unblank in oops case too */
4259 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
4260 return; /* but leave console_blanked != 0 */
4261
4262 if (blankinterval) {
4263 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4264 blank_state = blank_normal_wait;
4265 }
4266
4267 console_blanked = 0;
4268 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
4269 /* Low-level driver cannot restore -> do it ourselves */
4270 update_screen(vc);
4271 if (console_blank_hook)
4272 console_blank_hook(0);
4273 set_palette(vc);
4274 set_cursor(vc);
4275 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4276 }
4277 EXPORT_SYMBOL(do_unblank_screen);
4278
4279 /*
4280 * This is called by the outside world to cause a forced unblank, mostly for
4281 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4282 * call it with 1 as an argument and so force a mode restore... that may kill
4283 * X or at least garbage the screen but would also make the Oops visible...
4284 */
4285 void unblank_screen(void)
4286 {
4287 do_unblank_screen(0);
4288 }
4289
4290 /*
4291 * We defer the timer blanking to work queue so it can take the console mutex
4292 * (console operations can still happen at irq time, but only from printk which
4293 * has the console mutex. Not perfect yet, but better than no locking
4294 */
4295 static void blank_screen_t(struct timer_list *unused)
4296 {
4297 blank_timer_expired = 1;
4298 schedule_work(&console_work);
4299 }
4300
4301 void poke_blanked_console(void)
4302 {
4303 WARN_CONSOLE_UNLOCKED();
4304
4305 /* Add this so we quickly catch whoever might call us in a non
4306 * safe context. Nowadays, unblank_screen() isn't to be called in
4307 * atomic contexts and is allowed to schedule (with the special case
4308 * of oops_in_progress, but that isn't of any concern for this
4309 * function. --BenH.
4310 */
4311 might_sleep();
4312
4313 /* This isn't perfectly race free, but a race here would be mostly harmless,
4314 * at worse, we'll do a spurrious blank and it's unlikely
4315 */
4316 del_timer(&console_timer);
4317 blank_timer_expired = 0;
4318
4319 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4320 return;
4321 if (console_blanked)
4322 unblank_screen();
4323 else if (blankinterval) {
4324 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4325 blank_state = blank_normal_wait;
4326 }
4327 }
4328
4329 /*
4330 * Palettes
4331 */
4332
4333 static void set_palette(struct vc_data *vc)
4334 {
4335 WARN_CONSOLE_UNLOCKED();
4336
4337 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4338 vc->vc_sw->con_set_palette(vc, color_table);
4339 }
4340
4341 /*
4342 * Load palette into the DAC registers. arg points to a colour
4343 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4344 */
4345
4346 int con_set_cmap(unsigned char __user *arg)
4347 {
4348 int i, j, k;
4349 unsigned char colormap[3*16];
4350
4351 if (copy_from_user(colormap, arg, sizeof(colormap)))
4352 return -EFAULT;
4353
4354 console_lock();
4355 for (i = k = 0; i < 16; i++) {
4356 default_red[i] = colormap[k++];
4357 default_grn[i] = colormap[k++];
4358 default_blu[i] = colormap[k++];
4359 }
4360 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4361 if (!vc_cons_allocated(i))
4362 continue;
4363 for (j = k = 0; j < 16; j++) {
4364 vc_cons[i].d->vc_palette[k++] = default_red[j];
4365 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4366 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4367 }
4368 set_palette(vc_cons[i].d);
4369 }
4370 console_unlock();
4371
4372 return 0;
4373 }
4374
4375 int con_get_cmap(unsigned char __user *arg)
4376 {
4377 int i, k;
4378 unsigned char colormap[3*16];
4379
4380 console_lock();
4381 for (i = k = 0; i < 16; i++) {
4382 colormap[k++] = default_red[i];
4383 colormap[k++] = default_grn[i];
4384 colormap[k++] = default_blu[i];
4385 }
4386 console_unlock();
4387
4388 if (copy_to_user(arg, colormap, sizeof(colormap)))
4389 return -EFAULT;
4390
4391 return 0;
4392 }
4393
4394 void reset_palette(struct vc_data *vc)
4395 {
4396 int j, k;
4397 for (j=k=0; j<16; j++) {
4398 vc->vc_palette[k++] = default_red[j];
4399 vc->vc_palette[k++] = default_grn[j];
4400 vc->vc_palette[k++] = default_blu[j];
4401 }
4402 set_palette(vc);
4403 }
4404
4405 /*
4406 * Font switching
4407 *
4408 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4409 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4410 * depending on width) reserved for each character which is kinda wasty, but
4411 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4412 * is up to the actual low-level console-driver convert data into its favorite
4413 * format (maybe we should add a `fontoffset' field to the `display'
4414 * structure so we won't have to convert the fontdata all the time.
4415 * /Jes
4416 */
4417
4418 #define max_font_size 65536
4419
4420 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4421 {
4422 struct console_font font;
4423 int rc = -EINVAL;
4424 int c;
4425
4426 if (op->data) {
4427 font.data = kmalloc(max_font_size, GFP_KERNEL);
4428 if (!font.data)
4429 return -ENOMEM;
4430 } else
4431 font.data = NULL;
4432
4433 console_lock();
4434 if (vc->vc_mode != KD_TEXT)
4435 rc = -EINVAL;
4436 else if (vc->vc_sw->con_font_get)
4437 rc = vc->vc_sw->con_font_get(vc, &font);
4438 else
4439 rc = -ENOSYS;
4440 console_unlock();
4441
4442 if (rc)
4443 goto out;
4444
4445 c = (font.width+7)/8 * 32 * font.charcount;
4446
4447 if (op->data && font.charcount > op->charcount)
4448 rc = -ENOSPC;
4449 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4450 if (font.width > op->width || font.height > op->height)
4451 rc = -ENOSPC;
4452 } else {
4453 if (font.width != 8)
4454 rc = -EIO;
4455 else if ((op->height && font.height > op->height) ||
4456 font.height > 32)
4457 rc = -ENOSPC;
4458 }
4459 if (rc)
4460 goto out;
4461
4462 op->height = font.height;
4463 op->width = font.width;
4464 op->charcount = font.charcount;
4465
4466 if (op->data && copy_to_user(op->data, font.data, c))
4467 rc = -EFAULT;
4468
4469 out:
4470 kfree(font.data);
4471 return rc;
4472 }
4473
4474 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4475 {
4476 struct console_font font;
4477 int rc = -EINVAL;
4478 int size;
4479
4480 if (vc->vc_mode != KD_TEXT)
4481 return -EINVAL;
4482 if (!op->data)
4483 return -EINVAL;
4484 if (op->charcount > 512)
4485 return -EINVAL;
4486 if (op->width <= 0 || op->width > 32 || op->height > 32)
4487 return -EINVAL;
4488 size = (op->width+7)/8 * 32 * op->charcount;
4489 if (size > max_font_size)
4490 return -ENOSPC;
4491
4492 font.data = memdup_user(op->data, size);
4493 if (IS_ERR(font.data))
4494 return PTR_ERR(font.data);
4495
4496 if (!op->height) { /* Need to guess font height [compat] */
4497 int h, i;
4498 u8 *charmap = font.data;
4499
4500 /*
4501 * If from KDFONTOP ioctl, don't allow things which can be done
4502 * in userland,so that we can get rid of this soon
4503 */
4504 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4505 kfree(font.data);
4506 return -EINVAL;
4507 }
4508
4509 for (h = 32; h > 0; h--)
4510 for (i = 0; i < op->charcount; i++)
4511 if (charmap[32*i+h-1])
4512 goto nonzero;
4513
4514 kfree(font.data);
4515 return -EINVAL;
4516
4517 nonzero:
4518 op->height = h;
4519 }
4520
4521 font.charcount = op->charcount;
4522 font.width = op->width;
4523 font.height = op->height;
4524
4525 console_lock();
4526 if (vc->vc_mode != KD_TEXT)
4527 rc = -EINVAL;
4528 else if (vc->vc_sw->con_font_set)
4529 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4530 else
4531 rc = -ENOSYS;
4532 console_unlock();
4533 kfree(font.data);
4534 return rc;
4535 }
4536
4537 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4538 {
4539 struct console_font font = {.width = op->width, .height = op->height};
4540 char name[MAX_FONT_NAME];
4541 char *s = name;
4542 int rc;
4543
4544
4545 if (!op->data)
4546 s = NULL;
4547 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4548 return -EFAULT;
4549 else
4550 name[MAX_FONT_NAME - 1] = 0;
4551
4552 console_lock();
4553 if (vc->vc_mode != KD_TEXT) {
4554 console_unlock();
4555 return -EINVAL;
4556 }
4557 if (vc->vc_sw->con_font_default)
4558 rc = vc->vc_sw->con_font_default(vc, &font, s);
4559 else
4560 rc = -ENOSYS;
4561 console_unlock();
4562 if (!rc) {
4563 op->width = font.width;
4564 op->height = font.height;
4565 }
4566 return rc;
4567 }
4568
4569 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4570 {
4571 int con = op->height;
4572 int rc;
4573
4574
4575 console_lock();
4576 if (vc->vc_mode != KD_TEXT)
4577 rc = -EINVAL;
4578 else if (!vc->vc_sw->con_font_copy)
4579 rc = -ENOSYS;
4580 else if (con < 0 || !vc_cons_allocated(con))
4581 rc = -ENOTTY;
4582 else if (con == vc->vc_num) /* nothing to do */
4583 rc = 0;
4584 else
4585 rc = vc->vc_sw->con_font_copy(vc, con);
4586 console_unlock();
4587 return rc;
4588 }
4589
4590 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4591 {
4592 switch (op->op) {
4593 case KD_FONT_OP_SET:
4594 return con_font_set(vc, op);
4595 case KD_FONT_OP_GET:
4596 return con_font_get(vc, op);
4597 case KD_FONT_OP_SET_DEFAULT:
4598 return con_font_default(vc, op);
4599 case KD_FONT_OP_COPY:
4600 return con_font_copy(vc, op);
4601 }
4602 return -ENOSYS;
4603 }
4604
4605 /*
4606 * Interface exported to selection and vcs.
4607 */
4608
4609 /* used by selection */
4610 u16 screen_glyph(struct vc_data *vc, int offset)
4611 {
4612 u16 w = scr_readw(screenpos(vc, offset, 1));
4613 u16 c = w & 0xff;
4614
4615 if (w & vc->vc_hi_font_mask)
4616 c |= 0x100;
4617 return c;
4618 }
4619 EXPORT_SYMBOL_GPL(screen_glyph);
4620
4621 u32 screen_glyph_unicode(struct vc_data *vc, int n)
4622 {
4623 struct uni_screen *uniscr = get_vc_uniscr(vc);
4624
4625 if (uniscr)
4626 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4627 return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4628 }
4629 EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4630
4631 /* used by vcs - note the word offset */
4632 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4633 {
4634 return screenpos(vc, 2 * w_offset, viewed);
4635 }
4636 EXPORT_SYMBOL_GPL(screen_pos);
4637
4638 void getconsxy(struct vc_data *vc, unsigned char *p)
4639 {
4640 p[0] = vc->vc_x;
4641 p[1] = vc->vc_y;
4642 }
4643
4644 void putconsxy(struct vc_data *vc, unsigned char *p)
4645 {
4646 hide_cursor(vc);
4647 gotoxy(vc, p[0], p[1]);
4648 set_cursor(vc);
4649 }
4650
4651 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4652 {
4653 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4654 return softcursor_original;
4655 return scr_readw(org);
4656 }
4657
4658 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4659 {
4660 scr_writew(val, org);
4661 if ((unsigned long)org == vc->vc_pos) {
4662 softcursor_original = -1;
4663 add_softcursor(vc);
4664 }
4665 }
4666
4667 void vcs_scr_updated(struct vc_data *vc)
4668 {
4669 notify_update(vc);
4670 }
4671
4672 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4673 unsigned int rolled_over, void *base, unsigned int size)
4674 {
4675 unsigned long ubase = (unsigned long)base;
4676 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4677 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4678 ptrdiff_t origin = (void *)c->vc_origin - base;
4679 int margin = c->vc_size_row * 4;
4680 int from, wrap, from_off, avail;
4681
4682 /* Turn scrollback off */
4683 if (!lines) {
4684 c->vc_visible_origin = c->vc_origin;
4685 return;
4686 }
4687
4688 /* Do we have already enough to allow jumping from 0 to the end? */
4689 if (rolled_over > scr_end + margin) {
4690 from = scr_end;
4691 wrap = rolled_over + c->vc_size_row;
4692 } else {
4693 from = 0;
4694 wrap = size;
4695 }
4696
4697 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4698 avail = (origin - from + wrap) % wrap;
4699
4700 /* Only a little piece would be left? Show all incl. the piece! */
4701 if (avail < 2 * margin)
4702 margin = 0;
4703 if (from_off < margin)
4704 from_off = 0;
4705 if (from_off > avail - margin)
4706 from_off = avail;
4707
4708 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4709 }
4710 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4711
4712 /*
4713 * Visible symbols for modules
4714 */
4715
4716 EXPORT_SYMBOL(color_table);
4717 EXPORT_SYMBOL(default_red);
4718 EXPORT_SYMBOL(default_grn);
4719 EXPORT_SYMBOL(default_blu);
4720 EXPORT_SYMBOL(update_region);
4721 EXPORT_SYMBOL(redraw_screen);
4722 EXPORT_SYMBOL(vc_resize);
4723 EXPORT_SYMBOL(fg_console);
4724 EXPORT_SYMBOL(console_blank_hook);
4725 EXPORT_SYMBOL(console_blanked);
4726 EXPORT_SYMBOL(vc_cons);
4727 EXPORT_SYMBOL(global_cursor_default);
4728 #ifndef VT_SINGLE_DRIVER
4729 EXPORT_SYMBOL(give_up_console);
4730 #endif
Linux with added FPC-III support