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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / tty / vt / vt.c
blob35d21cdb60d0b82b0c786c235b7b873409efc774
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6 /*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
61 * deletion SMP-safe. 17Jun00, Andrew Morton
62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72 */
73
74 #include <linux/module.h>
75 #include <linux/types.h>
76 #include <linux/sched/signal.h>
77 #include <linux/tty.h>
78 #include <linux/tty_flip.h>
79 #include <linux/kernel.h>
80 #include <linux/string.h>
81 #include <linux/errno.h>
82 #include <linux/kd.h>
83 #include <linux/slab.h>
84 #include <linux/major.h>
85 #include <linux/mm.h>
86 #include <linux/console.h>
87 #include <linux/init.h>
88 #include <linux/mutex.h>
89 #include <linux/vt_kern.h>
90 #include <linux/selection.h>
91 #include <linux/tiocl.h>
92 #include <linux/kbd_kern.h>
93 #include <linux/consolemap.h>
94 #include <linux/timer.h>
95 #include <linux/interrupt.h>
96 #include <linux/workqueue.h>
97 #include <linux/pm.h>
98 #include <linux/font.h>
99 #include <linux/bitops.h>
100 #include <linux/notifier.h>
101 #include <linux/device.h>
102 #include <linux/io.h>
103 #include <linux/uaccess.h>
104 #include <linux/kdb.h>
105 #include <linux/ctype.h>
106 #include <linux/bsearch.h>
107 #include <linux/gcd.h>
108
109 #define MAX_NR_CON_DRIVER 16
110
111 #define CON_DRIVER_FLAG_MODULE 1
112 #define CON_DRIVER_FLAG_INIT 2
113 #define CON_DRIVER_FLAG_ATTR 4
114 #define CON_DRIVER_FLAG_ZOMBIE 8
115
116 struct con_driver {
117 const struct consw *con;
118 const char *desc;
119 struct device *dev;
120 int node;
121 int first;
122 int last;
123 int flag;
124 };
125
126 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
127 const struct consw *conswitchp;
128
129 /* A bitmap for codes <32. A bit of 1 indicates that the code
130 * corresponding to that bit number invokes some special action
131 * (such as cursor movement) and should not be displayed as a
132 * glyph unless the disp_ctrl mode is explicitly enabled.
133 */
134 #define CTRL_ACTION 0x0d00ff81
135 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
136
137 /*
138 * Here is the default bell parameters: 750HZ, 1/8th of a second
139 */
140 #define DEFAULT_BELL_PITCH 750
141 #define DEFAULT_BELL_DURATION (HZ/8)
142 #define DEFAULT_CURSOR_BLINK_MS 200
143
144 struct vc vc_cons [MAX_NR_CONSOLES];
145
146 #ifndef VT_SINGLE_DRIVER
147 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
148 #endif
149
150 static int con_open(struct tty_struct *, struct file *);
151 static void vc_init(struct vc_data *vc, unsigned int rows,
152 unsigned int cols, int do_clear);
153 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
154 static void save_cur(struct vc_data *vc);
155 static void reset_terminal(struct vc_data *vc, int do_clear);
156 static void con_flush_chars(struct tty_struct *tty);
157 static int set_vesa_blanking(char __user *p);
158 static void set_cursor(struct vc_data *vc);
159 static void hide_cursor(struct vc_data *vc);
160 static void console_callback(struct work_struct *ignored);
161 static void con_driver_unregister_callback(struct work_struct *ignored);
162 static void blank_screen_t(struct timer_list *unused);
163 static void set_palette(struct vc_data *vc);
164
165 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
166
167 static int printable; /* Is console ready for printing? */
168 int default_utf8 = true;
169 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
170 int global_cursor_default = -1;
171 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
172
173 static int cur_default = CUR_DEFAULT;
174 module_param(cur_default, int, S_IRUGO | S_IWUSR);
175
176 /*
177 * ignore_poke: don't unblank the screen when things are typed. This is
178 * mainly for the privacy of braille terminal users.
179 */
180 static int ignore_poke;
181
182 int do_poke_blanked_console;
183 int console_blanked;
184
185 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
186 static int vesa_off_interval;
187 static int blankinterval;
188 core_param(consoleblank, blankinterval, int, 0444);
189
190 static DECLARE_WORK(console_work, console_callback);
191 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
192
193 /*
194 * fg_console is the current virtual console,
195 * last_console is the last used one,
196 * want_console is the console we want to switch to,
197 * saved_* variants are for save/restore around kernel debugger enter/leave
198 */
199 int fg_console;
200 int last_console;
201 int want_console = -1;
202 static int saved_fg_console;
203 static int saved_last_console;
204 static int saved_want_console;
205 static int saved_vc_mode;
206 static int saved_console_blanked;
207
208 /*
209 * For each existing display, we have a pointer to console currently visible
210 * on that display, allowing consoles other than fg_console to be refreshed
211 * appropriately. Unless the low-level driver supplies its own display_fg
212 * variable, we use this one for the "master display".
213 */
214 static struct vc_data *master_display_fg;
215
216 /*
217 * Unfortunately, we need to delay tty echo when we're currently writing to the
218 * console since the code is (and always was) not re-entrant, so we schedule
219 * all flip requests to process context with schedule-task() and run it from
220 * console_callback().
221 */
222
223 /*
224 * For the same reason, we defer scrollback to the console callback.
225 */
226 static int scrollback_delta;
227
228 /*
229 * Hook so that the power management routines can (un)blank
230 * the console on our behalf.
231 */
232 int (*console_blank_hook)(int);
233
234 static DEFINE_TIMER(console_timer, blank_screen_t);
235 static int blank_state;
236 static int blank_timer_expired;
237 enum {
238 blank_off = 0,
239 blank_normal_wait,
240 blank_vesa_wait,
241 };
242
243 /*
244 * /sys/class/tty/tty0/
245 *
246 * the attribute 'active' contains the name of the current vc
247 * console and it supports poll() to detect vc switches
248 */
249 static struct device *tty0dev;
250
251 /*
252 * Notifier list for console events.
253 */
254 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
255
256 int register_vt_notifier(struct notifier_block *nb)
257 {
258 return atomic_notifier_chain_register(&vt_notifier_list, nb);
259 }
260 EXPORT_SYMBOL_GPL(register_vt_notifier);
261
262 int unregister_vt_notifier(struct notifier_block *nb)
263 {
264 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
265 }
266 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
267
268 static void notify_write(struct vc_data *vc, unsigned int unicode)
269 {
270 struct vt_notifier_param param = { .vc = vc, .c = unicode };
271 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
272 }
273
274 static void notify_update(struct vc_data *vc)
275 {
276 struct vt_notifier_param param = { .vc = vc };
277 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
278 }
279 /*
280 * Low-Level Functions
281 */
282
283 static inline bool con_is_fg(const struct vc_data *vc)
284 {
285 return vc->vc_num == fg_console;
286 }
287
288 static inline bool con_should_update(const struct vc_data *vc)
289 {
290 return con_is_visible(vc) && !console_blanked;
291 }
292
293 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
294 {
295 unsigned short *p;
296
297 if (!viewed)
298 p = (unsigned short *)(vc->vc_origin + offset);
299 else if (!vc->vc_sw->con_screen_pos)
300 p = (unsigned short *)(vc->vc_visible_origin + offset);
301 else
302 p = vc->vc_sw->con_screen_pos(vc, offset);
303 return p;
304 }
305
306 /* Called from the keyboard irq path.. */
307 static inline void scrolldelta(int lines)
308 {
309 /* FIXME */
310 /* scrolldelta needs some kind of consistency lock, but the BKL was
311 and still is not protecting versus the scheduled back end */
312 scrollback_delta += lines;
313 schedule_console_callback();
314 }
315
316 void schedule_console_callback(void)
317 {
318 schedule_work(&console_work);
319 }
320
321 /*
322 * Code to manage unicode-based screen buffers
323 */
324
325 #ifdef NO_VC_UNI_SCREEN
326 /* this disables and optimizes related code away at compile time */
327 #define get_vc_uniscr(vc) NULL
328 #else
329 #define get_vc_uniscr(vc) vc->vc_uni_screen
330 #endif
331
332 #define VC_UNI_SCREEN_DEBUG 0
333
334 typedef uint32_t char32_t;
335
336 /*
337 * Our screen buffer is preceded by an array of line pointers so that
338 * scrolling only implies some pointer shuffling.
339 */
340 struct uni_screen {
341 char32_t *lines[0];
342 };
343
344 static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
345 {
346 struct uni_screen *uniscr;
347 void *p;
348 unsigned int memsize, i;
349
350 /* allocate everything in one go */
351 memsize = cols * rows * sizeof(char32_t);
352 memsize += rows * sizeof(char32_t *);
353 p = kmalloc(memsize, GFP_KERNEL);
354 if (!p)
355 return NULL;
356
357 /* initial line pointers */
358 uniscr = p;
359 p = uniscr->lines + rows;
360 for (i = 0; i < rows; i++) {
361 uniscr->lines[i] = p;
362 p += cols * sizeof(char32_t);
363 }
364 return uniscr;
365 }
366
367 static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
368 {
369 kfree(vc->vc_uni_screen);
370 vc->vc_uni_screen = new_uniscr;
371 }
372
373 static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
374 {
375 struct uni_screen *uniscr = get_vc_uniscr(vc);
376
377 if (uniscr)
378 uniscr->lines[vc->vc_y][vc->vc_x] = uc;
379 }
380
381 static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
382 {
383 struct uni_screen *uniscr = get_vc_uniscr(vc);
384
385 if (uniscr) {
386 char32_t *ln = uniscr->lines[vc->vc_y];
387 unsigned int x = vc->vc_x, cols = vc->vc_cols;
388
389 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
390 memset32(&ln[x], ' ', nr);
391 }
392 }
393
394 static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
395 {
396 struct uni_screen *uniscr = get_vc_uniscr(vc);
397
398 if (uniscr) {
399 char32_t *ln = uniscr->lines[vc->vc_y];
400 unsigned int x = vc->vc_x, cols = vc->vc_cols;
401
402 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
403 memset32(&ln[cols - nr], ' ', nr);
404 }
405 }
406
407 static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
408 unsigned int nr)
409 {
410 struct uni_screen *uniscr = get_vc_uniscr(vc);
411
412 if (uniscr) {
413 char32_t *ln = uniscr->lines[vc->vc_y];
414
415 memset32(&ln[x], ' ', nr);
416 }
417 }
418
419 static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
420 unsigned int nr)
421 {
422 struct uni_screen *uniscr = get_vc_uniscr(vc);
423
424 if (uniscr) {
425 unsigned int cols = vc->vc_cols;
426
427 while (nr--)
428 memset32(uniscr->lines[y++], ' ', cols);
429 }
430 }
431
432 static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
433 enum con_scroll dir, unsigned int nr)
434 {
435 struct uni_screen *uniscr = get_vc_uniscr(vc);
436
437 if (uniscr) {
438 unsigned int i, j, k, sz, d, clear;
439
440 sz = b - t;
441 clear = b - nr;
442 d = nr;
443 if (dir == SM_DOWN) {
444 clear = t;
445 d = sz - nr;
446 }
447 for (i = 0; i < gcd(d, sz); i++) {
448 char32_t *tmp = uniscr->lines[t + i];
449 j = i;
450 while (1) {
451 k = j + d;
452 if (k >= sz)
453 k -= sz;
454 if (k == i)
455 break;
456 uniscr->lines[t + j] = uniscr->lines[t + k];
457 j = k;
458 }
459 uniscr->lines[t + j] = tmp;
460 }
461 vc_uniscr_clear_lines(vc, clear, nr);
462 }
463 }
464
465 static void vc_uniscr_copy_area(struct uni_screen *dst,
466 unsigned int dst_cols,
467 unsigned int dst_rows,
468 struct uni_screen *src,
469 unsigned int src_cols,
470 unsigned int src_top_row,
471 unsigned int src_bot_row)
472 {
473 unsigned int dst_row = 0;
474
475 if (!dst)
476 return;
477
478 while (src_top_row < src_bot_row) {
479 char32_t *src_line = src->lines[src_top_row];
480 char32_t *dst_line = dst->lines[dst_row];
481
482 memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
483 if (dst_cols - src_cols)
484 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
485 src_top_row++;
486 dst_row++;
487 }
488 while (dst_row < dst_rows) {
489 char32_t *dst_line = dst->lines[dst_row];
490
491 memset32(dst_line, ' ', dst_cols);
492 dst_row++;
493 }
494 }
495
496 /*
497 * Called from vcs_read() to make sure unicode screen retrieval is possible.
498 * This will initialize the unicode screen buffer if not already done.
499 * This returns 0 if OK, or a negative error code otherwise.
500 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
501 */
502 int vc_uniscr_check(struct vc_data *vc)
503 {
504 struct uni_screen *uniscr;
505 unsigned short *p;
506 int x, y, mask;
507
508 if (__is_defined(NO_VC_UNI_SCREEN))
509 return -EOPNOTSUPP;
510
511 WARN_CONSOLE_UNLOCKED();
512
513 if (!vc->vc_utf)
514 return -ENODATA;
515
516 if (vc->vc_uni_screen)
517 return 0;
518
519 uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
520 if (!uniscr)
521 return -ENOMEM;
522
523 /*
524 * Let's populate it initially with (imperfect) reverse translation.
525 * This is the next best thing we can do short of having it enabled
526 * from the start even when no users rely on this functionality. True
527 * unicode content will be available after a complete screen refresh.
528 */
529 p = (unsigned short *)vc->vc_origin;
530 mask = vc->vc_hi_font_mask | 0xff;
531 for (y = 0; y < vc->vc_rows; y++) {
532 char32_t *line = uniscr->lines[y];
533 for (x = 0; x < vc->vc_cols; x++) {
534 u16 glyph = scr_readw(p++) & mask;
535 line[x] = inverse_translate(vc, glyph, true);
536 }
537 }
538
539 vc->vc_uni_screen = uniscr;
540 return 0;
541 }
542
543 /*
544 * Called from vcs_read() to get the unicode data from the screen.
545 * This must be preceded by a successful call to vc_uniscr_check() once
546 * the console lock has been taken.
547 */
548 void vc_uniscr_copy_line(struct vc_data *vc, void *dest, int viewed,
549 unsigned int row, unsigned int col, unsigned int nr)
550 {
551 struct uni_screen *uniscr = get_vc_uniscr(vc);
552 int offset = row * vc->vc_size_row + col * 2;
553 unsigned long pos;
554
555 BUG_ON(!uniscr);
556
557 pos = (unsigned long)screenpos(vc, offset, viewed);
558 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
559 /*
560 * Desired position falls in the main screen buffer.
561 * However the actual row/col might be different if
562 * scrollback is active.
563 */
564 row = (pos - vc->vc_origin) / vc->vc_size_row;
565 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
566 memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
567 } else {
568 /*
569 * Scrollback is active. For now let's simply backtranslate
570 * the screen glyphs until the unicode screen buffer does
571 * synchronize with console display drivers for a scrollback
572 * buffer of its own.
573 */
574 u16 *p = (u16 *)pos;
575 int mask = vc->vc_hi_font_mask | 0xff;
576 char32_t *uni_buf = dest;
577 while (nr--) {
578 u16 glyph = scr_readw(p++) & mask;
579 *uni_buf++ = inverse_translate(vc, glyph, true);
580 }
581 }
582 }
583
584 /* this is for validation and debugging only */
585 static void vc_uniscr_debug_check(struct vc_data *vc)
586 {
587 struct uni_screen *uniscr = get_vc_uniscr(vc);
588 unsigned short *p;
589 int x, y, mask;
590
591 if (!VC_UNI_SCREEN_DEBUG || !uniscr)
592 return;
593
594 WARN_CONSOLE_UNLOCKED();
595
596 /*
597 * Make sure our unicode screen translates into the same glyphs
598 * as the actual screen. This is brutal indeed.
599 */
600 p = (unsigned short *)vc->vc_origin;
601 mask = vc->vc_hi_font_mask | 0xff;
602 for (y = 0; y < vc->vc_rows; y++) {
603 char32_t *line = uniscr->lines[y];
604 for (x = 0; x < vc->vc_cols; x++) {
605 u16 glyph = scr_readw(p++) & mask;
606 char32_t uc = line[x];
607 int tc = conv_uni_to_pc(vc, uc);
608 if (tc == -4)
609 tc = conv_uni_to_pc(vc, 0xfffd);
610 if (tc == -4)
611 tc = conv_uni_to_pc(vc, '?');
612 if (tc != glyph)
613 pr_err_ratelimited(
614 "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
615 __func__, x, y, glyph, tc);
616 }
617 }
618 }
619
620
621 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
622 enum con_scroll dir, unsigned int nr)
623 {
624 u16 *clear, *d, *s;
625
626 if (t + nr >= b)
627 nr = b - t - 1;
628 if (b > vc->vc_rows || t >= b || nr < 1)
629 return;
630 vc_uniscr_scroll(vc, t, b, dir, nr);
631 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
632 return;
633
634 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
635 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
636
637 if (dir == SM_UP) {
638 clear = s + (b - t - nr) * vc->vc_cols;
639 swap(s, d);
640 }
641 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
642 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
643 }
644
645 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
646 {
647 unsigned int xx, yy, offset;
648 u16 *p;
649
650 p = (u16 *) start;
651 if (!vc->vc_sw->con_getxy) {
652 offset = (start - vc->vc_origin) / 2;
653 xx = offset % vc->vc_cols;
654 yy = offset / vc->vc_cols;
655 } else {
656 int nxx, nyy;
657 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
658 xx = nxx; yy = nyy;
659 }
660 for(;;) {
661 u16 attrib = scr_readw(p) & 0xff00;
662 int startx = xx;
663 u16 *q = p;
664 while (xx < vc->vc_cols && count) {
665 if (attrib != (scr_readw(p) & 0xff00)) {
666 if (p > q)
667 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
668 startx = xx;
669 q = p;
670 attrib = scr_readw(p) & 0xff00;
671 }
672 p++;
673 xx++;
674 count--;
675 }
676 if (p > q)
677 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
678 if (!count)
679 break;
680 xx = 0;
681 yy++;
682 if (vc->vc_sw->con_getxy) {
683 p = (u16 *)start;
684 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
685 }
686 }
687 }
688
689 void update_region(struct vc_data *vc, unsigned long start, int count)
690 {
691 WARN_CONSOLE_UNLOCKED();
692
693 if (con_should_update(vc)) {
694 hide_cursor(vc);
695 do_update_region(vc, start, count);
696 set_cursor(vc);
697 }
698 }
699
700 /* Structure of attributes is hardware-dependent */
701
702 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
703 u8 _underline, u8 _reverse, u8 _italic)
704 {
705 if (vc->vc_sw->con_build_attr)
706 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
707 _blink, _underline, _reverse, _italic);
708
709 /*
710 * ++roman: I completely changed the attribute format for monochrome
711 * mode (!can_do_color). The formerly used MDA (monochrome display
712 * adapter) format didn't allow the combination of certain effects.
713 * Now the attribute is just a bit vector:
714 * Bit 0..1: intensity (0..2)
715 * Bit 2 : underline
716 * Bit 3 : reverse
717 * Bit 7 : blink
718 */
719 {
720 u8 a = _color;
721 if (!vc->vc_can_do_color)
722 return _intensity |
723 (_italic ? 2 : 0) |
724 (_underline ? 4 : 0) |
725 (_reverse ? 8 : 0) |
726 (_blink ? 0x80 : 0);
727 if (_italic)
728 a = (a & 0xF0) | vc->vc_itcolor;
729 else if (_underline)
730 a = (a & 0xf0) | vc->vc_ulcolor;
731 else if (_intensity == 0)
732 a = (a & 0xf0) | vc->vc_halfcolor;
733 if (_reverse)
734 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
735 if (_blink)
736 a ^= 0x80;
737 if (_intensity == 2)
738 a ^= 0x08;
739 if (vc->vc_hi_font_mask == 0x100)
740 a <<= 1;
741 return a;
742 }
743 }
744
745 static void update_attr(struct vc_data *vc)
746 {
747 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
748 vc->vc_blink, vc->vc_underline,
749 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
750 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
751 }
752
753 /* Note: inverting the screen twice should revert to the original state */
754 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
755 {
756 unsigned short *p;
757
758 WARN_CONSOLE_UNLOCKED();
759
760 count /= 2;
761 p = screenpos(vc, offset, viewed);
762 if (vc->vc_sw->con_invert_region) {
763 vc->vc_sw->con_invert_region(vc, p, count);
764 } else {
765 u16 *q = p;
766 int cnt = count;
767 u16 a;
768
769 if (!vc->vc_can_do_color) {
770 while (cnt--) {
771 a = scr_readw(q);
772 a ^= 0x0800;
773 scr_writew(a, q);
774 q++;
775 }
776 } else if (vc->vc_hi_font_mask == 0x100) {
777 while (cnt--) {
778 a = scr_readw(q);
779 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
780 scr_writew(a, q);
781 q++;
782 }
783 } else {
784 while (cnt--) {
785 a = scr_readw(q);
786 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
787 scr_writew(a, q);
788 q++;
789 }
790 }
791 }
792
793 if (con_should_update(vc))
794 do_update_region(vc, (unsigned long) p, count);
795 notify_update(vc);
796 }
797
798 /* used by selection: complement pointer position */
799 void complement_pos(struct vc_data *vc, int offset)
800 {
801 static int old_offset = -1;
802 static unsigned short old;
803 static unsigned short oldx, oldy;
804
805 WARN_CONSOLE_UNLOCKED();
806
807 if (old_offset != -1 && old_offset >= 0 &&
808 old_offset < vc->vc_screenbuf_size) {
809 scr_writew(old, screenpos(vc, old_offset, 1));
810 if (con_should_update(vc))
811 vc->vc_sw->con_putc(vc, old, oldy, oldx);
812 notify_update(vc);
813 }
814
815 old_offset = offset;
816
817 if (offset != -1 && offset >= 0 &&
818 offset < vc->vc_screenbuf_size) {
819 unsigned short new;
820 unsigned short *p;
821 p = screenpos(vc, offset, 1);
822 old = scr_readw(p);
823 new = old ^ vc->vc_complement_mask;
824 scr_writew(new, p);
825 if (con_should_update(vc)) {
826 oldx = (offset >> 1) % vc->vc_cols;
827 oldy = (offset >> 1) / vc->vc_cols;
828 vc->vc_sw->con_putc(vc, new, oldy, oldx);
829 }
830 notify_update(vc);
831 }
832 }
833
834 static void insert_char(struct vc_data *vc, unsigned int nr)
835 {
836 unsigned short *p = (unsigned short *) vc->vc_pos;
837
838 vc_uniscr_insert(vc, nr);
839 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
840 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
841 vc->vc_need_wrap = 0;
842 if (con_should_update(vc))
843 do_update_region(vc, (unsigned long) p,
844 vc->vc_cols - vc->vc_x);
845 }
846
847 static void delete_char(struct vc_data *vc, unsigned int nr)
848 {
849 unsigned short *p = (unsigned short *) vc->vc_pos;
850
851 vc_uniscr_delete(vc, nr);
852 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
853 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
854 nr * 2);
855 vc->vc_need_wrap = 0;
856 if (con_should_update(vc))
857 do_update_region(vc, (unsigned long) p,
858 vc->vc_cols - vc->vc_x);
859 }
860
861 static int softcursor_original = -1;
862
863 static void add_softcursor(struct vc_data *vc)
864 {
865 int i = scr_readw((u16 *) vc->vc_pos);
866 u32 type = vc->vc_cursor_type;
867
868 if (! (type & 0x10)) return;
869 if (softcursor_original != -1) return;
870 softcursor_original = i;
871 i |= ((type >> 8) & 0xff00 );
872 i ^= ((type) & 0xff00 );
873 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
874 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
875 scr_writew(i, (u16 *) vc->vc_pos);
876 if (con_should_update(vc))
877 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
878 }
879
880 static void hide_softcursor(struct vc_data *vc)
881 {
882 if (softcursor_original != -1) {
883 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
884 if (con_should_update(vc))
885 vc->vc_sw->con_putc(vc, softcursor_original,
886 vc->vc_y, vc->vc_x);
887 softcursor_original = -1;
888 }
889 }
890
891 static void hide_cursor(struct vc_data *vc)
892 {
893 if (vc == sel_cons)
894 clear_selection();
895 vc->vc_sw->con_cursor(vc, CM_ERASE);
896 hide_softcursor(vc);
897 }
898
899 static void set_cursor(struct vc_data *vc)
900 {
901 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
902 return;
903 if (vc->vc_deccm) {
904 if (vc == sel_cons)
905 clear_selection();
906 add_softcursor(vc);
907 if ((vc->vc_cursor_type & 0x0f) != 1)
908 vc->vc_sw->con_cursor(vc, CM_DRAW);
909 } else
910 hide_cursor(vc);
911 }
912
913 static void set_origin(struct vc_data *vc)
914 {
915 WARN_CONSOLE_UNLOCKED();
916
917 if (!con_is_visible(vc) ||
918 !vc->vc_sw->con_set_origin ||
919 !vc->vc_sw->con_set_origin(vc))
920 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
921 vc->vc_visible_origin = vc->vc_origin;
922 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
923 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
924 }
925
926 static void save_screen(struct vc_data *vc)
927 {
928 WARN_CONSOLE_UNLOCKED();
929
930 if (vc->vc_sw->con_save_screen)
931 vc->vc_sw->con_save_screen(vc);
932 }
933
934 static void flush_scrollback(struct vc_data *vc)
935 {
936 WARN_CONSOLE_UNLOCKED();
937
938 set_origin(vc);
939 if (vc->vc_sw->con_flush_scrollback)
940 vc->vc_sw->con_flush_scrollback(vc);
941 else
942 vc->vc_sw->con_switch(vc);
943 }
944
945 /*
946 * Redrawing of screen
947 */
948
949 void clear_buffer_attributes(struct vc_data *vc)
950 {
951 unsigned short *p = (unsigned short *)vc->vc_origin;
952 int count = vc->vc_screenbuf_size / 2;
953 int mask = vc->vc_hi_font_mask | 0xff;
954
955 for (; count > 0; count--, p++) {
956 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
957 }
958 }
959
960 void redraw_screen(struct vc_data *vc, int is_switch)
961 {
962 int redraw = 0;
963
964 WARN_CONSOLE_UNLOCKED();
965
966 if (!vc) {
967 /* strange ... */
968 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
969 return;
970 }
971
972 if (is_switch) {
973 struct vc_data *old_vc = vc_cons[fg_console].d;
974 if (old_vc == vc)
975 return;
976 if (!con_is_visible(vc))
977 redraw = 1;
978 *vc->vc_display_fg = vc;
979 fg_console = vc->vc_num;
980 hide_cursor(old_vc);
981 if (!con_is_visible(old_vc)) {
982 save_screen(old_vc);
983 set_origin(old_vc);
984 }
985 if (tty0dev)
986 sysfs_notify(&tty0dev->kobj, NULL, "active");
987 } else {
988 hide_cursor(vc);
989 redraw = 1;
990 }
991
992 if (redraw) {
993 int update;
994 int old_was_color = vc->vc_can_do_color;
995
996 set_origin(vc);
997 update = vc->vc_sw->con_switch(vc);
998 set_palette(vc);
999 /*
1000 * If console changed from mono<->color, the best we can do
1001 * is to clear the buffer attributes. As it currently stands,
1002 * rebuilding new attributes from the old buffer is not doable
1003 * without overly complex code.
1004 */
1005 if (old_was_color != vc->vc_can_do_color) {
1006 update_attr(vc);
1007 clear_buffer_attributes(vc);
1008 }
1009
1010 if (update && vc->vc_mode != KD_GRAPHICS)
1011 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1012 }
1013 set_cursor(vc);
1014 if (is_switch) {
1015 set_leds();
1016 compute_shiftstate();
1017 notify_update(vc);
1018 }
1019 }
1020
1021 /*
1022 * Allocation, freeing and resizing of VTs.
1023 */
1024
1025 int vc_cons_allocated(unsigned int i)
1026 {
1027 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1028 }
1029
1030 static void visual_init(struct vc_data *vc, int num, int init)
1031 {
1032 /* ++Geert: vc->vc_sw->con_init determines console size */
1033 if (vc->vc_sw)
1034 module_put(vc->vc_sw->owner);
1035 vc->vc_sw = conswitchp;
1036 #ifndef VT_SINGLE_DRIVER
1037 if (con_driver_map[num])
1038 vc->vc_sw = con_driver_map[num];
1039 #endif
1040 __module_get(vc->vc_sw->owner);
1041 vc->vc_num = num;
1042 vc->vc_display_fg = &master_display_fg;
1043 if (vc->vc_uni_pagedir_loc)
1044 con_free_unimap(vc);
1045 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
1046 vc->vc_uni_pagedir = NULL;
1047 vc->vc_hi_font_mask = 0;
1048 vc->vc_complement_mask = 0;
1049 vc->vc_can_do_color = 0;
1050 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1051 vc->vc_sw->con_init(vc, init);
1052 if (!vc->vc_complement_mask)
1053 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1054 vc->vc_s_complement_mask = vc->vc_complement_mask;
1055 vc->vc_size_row = vc->vc_cols << 1;
1056 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1057 }
1058
1059
1060 static void visual_deinit(struct vc_data *vc)
1061 {
1062 vc->vc_sw->con_deinit(vc);
1063 module_put(vc->vc_sw->owner);
1064 }
1065
1066 int vc_allocate(unsigned int currcons) /* return 0 on success */
1067 {
1068 struct vt_notifier_param param;
1069 struct vc_data *vc;
1070
1071 WARN_CONSOLE_UNLOCKED();
1072
1073 if (currcons >= MAX_NR_CONSOLES)
1074 return -ENXIO;
1075
1076 if (vc_cons[currcons].d)
1077 return 0;
1078
1079 /* due to the granularity of kmalloc, we waste some memory here */
1080 /* the alloc is done in two steps, to optimize the common situation
1081 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1082 /* although the numbers above are not valid since long ago, the
1083 point is still up-to-date and the comment still has its value
1084 even if only as a historical artifact. --mj, July 1998 */
1085 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1086 if (!vc)
1087 return -ENOMEM;
1088
1089 vc_cons[currcons].d = vc;
1090 tty_port_init(&vc->port);
1091 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1092
1093 visual_init(vc, currcons, 1);
1094
1095 if (!*vc->vc_uni_pagedir_loc)
1096 con_set_default_unimap(vc);
1097
1098 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1099 if (!vc->vc_screenbuf)
1100 goto err_free;
1101
1102 /* If no drivers have overridden us and the user didn't pass a
1103 boot option, default to displaying the cursor */
1104 if (global_cursor_default == -1)
1105 global_cursor_default = 1;
1106
1107 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1108 vcs_make_sysfs(currcons);
1109 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1110
1111 return 0;
1112 err_free:
1113 visual_deinit(vc);
1114 kfree(vc);
1115 vc_cons[currcons].d = NULL;
1116 return -ENOMEM;
1117 }
1118
1119 static inline int resize_screen(struct vc_data *vc, int width, int height,
1120 int user)
1121 {
1122 /* Resizes the resolution of the display adapater */
1123 int err = 0;
1124
1125 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
1126 err = vc->vc_sw->con_resize(vc, width, height, user);
1127
1128 return err;
1129 }
1130
1131 /*
1132 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1133 * [this is to be used together with some user program
1134 * like resize that changes the hardware videomode]
1135 */
1136 #define VC_RESIZE_MAXCOL (32767)
1137 #define VC_RESIZE_MAXROW (32767)
1138
1139 /**
1140 * vc_do_resize - resizing method for the tty
1141 * @tty: tty being resized
1142 * @real_tty: real tty (different to tty if a pty/tty pair)
1143 * @vc: virtual console private data
1144 * @cols: columns
1145 * @lines: lines
1146 *
1147 * Resize a virtual console, clipping according to the actual constraints.
1148 * If the caller passes a tty structure then update the termios winsize
1149 * information and perform any necessary signal handling.
1150 *
1151 * Caller must hold the console semaphore. Takes the termios rwsem and
1152 * ctrl_lock of the tty IFF a tty is passed.
1153 */
1154
1155 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1156 unsigned int cols, unsigned int lines)
1157 {
1158 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1159 unsigned long end;
1160 unsigned int old_rows, old_row_size, first_copied_row;
1161 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1162 unsigned int user;
1163 unsigned short *newscreen;
1164 struct uni_screen *new_uniscr = NULL;
1165
1166 WARN_CONSOLE_UNLOCKED();
1167
1168 if (!vc)
1169 return -ENXIO;
1170
1171 user = vc->vc_resize_user;
1172 vc->vc_resize_user = 0;
1173
1174 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
1175 return -EINVAL;
1176
1177 new_cols = (cols ? cols : vc->vc_cols);
1178 new_rows = (lines ? lines : vc->vc_rows);
1179 new_row_size = new_cols << 1;
1180 new_screen_size = new_row_size * new_rows;
1181
1182 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1183 return 0;
1184
1185 if (new_screen_size > (4 << 20))
1186 return -EINVAL;
1187 newscreen = kzalloc(new_screen_size, GFP_USER);
1188 if (!newscreen)
1189 return -ENOMEM;
1190
1191 if (get_vc_uniscr(vc)) {
1192 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1193 if (!new_uniscr) {
1194 kfree(newscreen);
1195 return -ENOMEM;
1196 }
1197 }
1198
1199 if (vc == sel_cons)
1200 clear_selection();
1201
1202 old_rows = vc->vc_rows;
1203 old_row_size = vc->vc_size_row;
1204
1205 err = resize_screen(vc, new_cols, new_rows, user);
1206 if (err) {
1207 kfree(newscreen);
1208 kfree(new_uniscr);
1209 return err;
1210 }
1211
1212 vc->vc_rows = new_rows;
1213 vc->vc_cols = new_cols;
1214 vc->vc_size_row = new_row_size;
1215 vc->vc_screenbuf_size = new_screen_size;
1216
1217 rlth = min(old_row_size, new_row_size);
1218 rrem = new_row_size - rlth;
1219 old_origin = vc->vc_origin;
1220 new_origin = (long) newscreen;
1221 new_scr_end = new_origin + new_screen_size;
1222
1223 if (vc->vc_y > new_rows) {
1224 if (old_rows - vc->vc_y < new_rows) {
1225 /*
1226 * Cursor near the bottom, copy contents from the
1227 * bottom of buffer
1228 */
1229 first_copied_row = (old_rows - new_rows);
1230 } else {
1231 /*
1232 * Cursor is in no man's land, copy 1/2 screenful
1233 * from the top and bottom of cursor position
1234 */
1235 first_copied_row = (vc->vc_y - new_rows/2);
1236 }
1237 old_origin += first_copied_row * old_row_size;
1238 } else
1239 first_copied_row = 0;
1240 end = old_origin + old_row_size * min(old_rows, new_rows);
1241
1242 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1243 get_vc_uniscr(vc), rlth/2, first_copied_row,
1244 min(old_rows, new_rows));
1245 vc_uniscr_set(vc, new_uniscr);
1246
1247 update_attr(vc);
1248
1249 while (old_origin < end) {
1250 scr_memcpyw((unsigned short *) new_origin,
1251 (unsigned short *) old_origin, rlth);
1252 if (rrem)
1253 scr_memsetw((void *)(new_origin + rlth),
1254 vc->vc_video_erase_char, rrem);
1255 old_origin += old_row_size;
1256 new_origin += new_row_size;
1257 }
1258 if (new_scr_end > new_origin)
1259 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1260 new_scr_end - new_origin);
1261 kfree(vc->vc_screenbuf);
1262 vc->vc_screenbuf = newscreen;
1263 vc->vc_screenbuf_size = new_screen_size;
1264 set_origin(vc);
1265
1266 /* do part of a reset_terminal() */
1267 vc->vc_top = 0;
1268 vc->vc_bottom = vc->vc_rows;
1269 gotoxy(vc, vc->vc_x, vc->vc_y);
1270 save_cur(vc);
1271
1272 if (tty) {
1273 /* Rewrite the requested winsize data with the actual
1274 resulting sizes */
1275 struct winsize ws;
1276 memset(&ws, 0, sizeof(ws));
1277 ws.ws_row = vc->vc_rows;
1278 ws.ws_col = vc->vc_cols;
1279 ws.ws_ypixel = vc->vc_scan_lines;
1280 tty_do_resize(tty, &ws);
1281 }
1282
1283 if (con_is_visible(vc))
1284 update_screen(vc);
1285 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1286 notify_update(vc);
1287 return err;
1288 }
1289
1290 /**
1291 * vc_resize - resize a VT
1292 * @vc: virtual console
1293 * @cols: columns
1294 * @rows: rows
1295 *
1296 * Resize a virtual console as seen from the console end of things. We
1297 * use the common vc_do_resize methods to update the structures. The
1298 * caller must hold the console sem to protect console internals and
1299 * vc->port.tty
1300 */
1301
1302 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1303 {
1304 return vc_do_resize(vc->port.tty, vc, cols, rows);
1305 }
1306
1307 /**
1308 * vt_resize - resize a VT
1309 * @tty: tty to resize
1310 * @ws: winsize attributes
1311 *
1312 * Resize a virtual terminal. This is called by the tty layer as we
1313 * register our own handler for resizing. The mutual helper does all
1314 * the actual work.
1315 *
1316 * Takes the console sem and the called methods then take the tty
1317 * termios_rwsem and the tty ctrl_lock in that order.
1318 */
1319 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1320 {
1321 struct vc_data *vc = tty->driver_data;
1322 int ret;
1323
1324 console_lock();
1325 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1326 console_unlock();
1327 return ret;
1328 }
1329
1330 struct vc_data *vc_deallocate(unsigned int currcons)
1331 {
1332 struct vc_data *vc = NULL;
1333
1334 WARN_CONSOLE_UNLOCKED();
1335
1336 if (vc_cons_allocated(currcons)) {
1337 struct vt_notifier_param param;
1338
1339 param.vc = vc = vc_cons[currcons].d;
1340 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1341 vcs_remove_sysfs(currcons);
1342 visual_deinit(vc);
1343 put_pid(vc->vt_pid);
1344 vc_uniscr_set(vc, NULL);
1345 kfree(vc->vc_screenbuf);
1346 vc_cons[currcons].d = NULL;
1347 }
1348 return vc;
1349 }
1350
1351 /*
1352 * VT102 emulator
1353 */
1354
1355 enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1356
1357 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1358 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1359 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1360
1361 #define decarm VC_REPEAT
1362 #define decckm VC_CKMODE
1363 #define kbdapplic VC_APPLIC
1364 #define lnm VC_CRLF
1365
1366 /*
1367 * this is what the terminal answers to a ESC-Z or csi0c query.
1368 */
1369 #define VT100ID "\033[?1;2c"
1370 #define VT102ID "\033[?6c"
1371
1372 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1373 8,12,10,14, 9,13,11,15 };
1374
1375 /* the default colour table, for VGA+ colour systems */
1376 unsigned char default_red[] = {
1377 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1378 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1379 };
1380 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1381
1382 unsigned char default_grn[] = {
1383 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1384 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1385 };
1386 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1387
1388 unsigned char default_blu[] = {
1389 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1390 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1391 };
1392 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1393
1394 /*
1395 * gotoxy() must verify all boundaries, because the arguments
1396 * might also be negative. If the given position is out of
1397 * bounds, the cursor is placed at the nearest margin.
1398 */
1399 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1400 {
1401 int min_y, max_y;
1402
1403 if (new_x < 0)
1404 vc->vc_x = 0;
1405 else {
1406 if (new_x >= vc->vc_cols)
1407 vc->vc_x = vc->vc_cols - 1;
1408 else
1409 vc->vc_x = new_x;
1410 }
1411
1412 if (vc->vc_decom) {
1413 min_y = vc->vc_top;
1414 max_y = vc->vc_bottom;
1415 } else {
1416 min_y = 0;
1417 max_y = vc->vc_rows;
1418 }
1419 if (new_y < min_y)
1420 vc->vc_y = min_y;
1421 else if (new_y >= max_y)
1422 vc->vc_y = max_y - 1;
1423 else
1424 vc->vc_y = new_y;
1425 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1426 vc->vc_need_wrap = 0;
1427 }
1428
1429 /* for absolute user moves, when decom is set */
1430 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1431 {
1432 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1433 }
1434
1435 void scrollback(struct vc_data *vc)
1436 {
1437 scrolldelta(-(vc->vc_rows / 2));
1438 }
1439
1440 void scrollfront(struct vc_data *vc, int lines)
1441 {
1442 if (!lines)
1443 lines = vc->vc_rows / 2;
1444 scrolldelta(lines);
1445 }
1446
1447 static void lf(struct vc_data *vc)
1448 {
1449 /* don't scroll if above bottom of scrolling region, or
1450 * if below scrolling region
1451 */
1452 if (vc->vc_y + 1 == vc->vc_bottom)
1453 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1454 else if (vc->vc_y < vc->vc_rows - 1) {
1455 vc->vc_y++;
1456 vc->vc_pos += vc->vc_size_row;
1457 }
1458 vc->vc_need_wrap = 0;
1459 notify_write(vc, '\n');
1460 }
1461
1462 static void ri(struct vc_data *vc)
1463 {
1464 /* don't scroll if below top of scrolling region, or
1465 * if above scrolling region
1466 */
1467 if (vc->vc_y == vc->vc_top)
1468 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1469 else if (vc->vc_y > 0) {
1470 vc->vc_y--;
1471 vc->vc_pos -= vc->vc_size_row;
1472 }
1473 vc->vc_need_wrap = 0;
1474 }
1475
1476 static inline void cr(struct vc_data *vc)
1477 {
1478 vc->vc_pos -= vc->vc_x << 1;
1479 vc->vc_need_wrap = vc->vc_x = 0;
1480 notify_write(vc, '\r');
1481 }
1482
1483 static inline void bs(struct vc_data *vc)
1484 {
1485 if (vc->vc_x) {
1486 vc->vc_pos -= 2;
1487 vc->vc_x--;
1488 vc->vc_need_wrap = 0;
1489 notify_write(vc, '\b');
1490 }
1491 }
1492
1493 static inline void del(struct vc_data *vc)
1494 {
1495 /* ignored */
1496 }
1497
1498 static void csi_J(struct vc_data *vc, int vpar)
1499 {
1500 unsigned int count;
1501 unsigned short * start;
1502
1503 switch (vpar) {
1504 case 0: /* erase from cursor to end of display */
1505 vc_uniscr_clear_line(vc, vc->vc_x,
1506 vc->vc_cols - vc->vc_x);
1507 vc_uniscr_clear_lines(vc, vc->vc_y + 1,
1508 vc->vc_rows - vc->vc_y - 1);
1509 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1510 start = (unsigned short *)vc->vc_pos;
1511 break;
1512 case 1: /* erase from start to cursor */
1513 vc_uniscr_clear_line(vc, 0, vc->vc_x + 1);
1514 vc_uniscr_clear_lines(vc, 0, vc->vc_y);
1515 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1516 start = (unsigned short *)vc->vc_origin;
1517 break;
1518 case 3: /* include scrollback */
1519 flush_scrollback(vc);
1520 /* fallthrough */
1521 case 2: /* erase whole display */
1522 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1523 count = vc->vc_cols * vc->vc_rows;
1524 start = (unsigned short *)vc->vc_origin;
1525 break;
1526 default:
1527 return;
1528 }
1529 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1530 if (con_should_update(vc))
1531 do_update_region(vc, (unsigned long) start, count);
1532 vc->vc_need_wrap = 0;
1533 }
1534
1535 static void csi_K(struct vc_data *vc, int vpar)
1536 {
1537 unsigned int count;
1538 unsigned short *start = (unsigned short *)vc->vc_pos;
1539 int offset;
1540
1541 switch (vpar) {
1542 case 0: /* erase from cursor to end of line */
1543 offset = 0;
1544 count = vc->vc_cols - vc->vc_x;
1545 break;
1546 case 1: /* erase from start of line to cursor */
1547 offset = -vc->vc_x;
1548 count = vc->vc_x + 1;
1549 break;
1550 case 2: /* erase whole line */
1551 offset = -vc->vc_x;
1552 count = vc->vc_cols;
1553 break;
1554 default:
1555 return;
1556 }
1557 vc_uniscr_clear_line(vc, vc->vc_x + offset, count);
1558 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1559 vc->vc_need_wrap = 0;
1560 if (con_should_update(vc))
1561 do_update_region(vc, (unsigned long)(start + offset), count);
1562 }
1563
1564 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1565 { /* not vt100? */
1566 int count;
1567
1568 if (!vpar)
1569 vpar++;
1570 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1571
1572 vc_uniscr_clear_line(vc, vc->vc_x, count);
1573 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1574 if (con_should_update(vc))
1575 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1576 vc->vc_need_wrap = 0;
1577 }
1578
1579 static void default_attr(struct vc_data *vc)
1580 {
1581 vc->vc_intensity = 1;
1582 vc->vc_italic = 0;
1583 vc->vc_underline = 0;
1584 vc->vc_reverse = 0;
1585 vc->vc_blink = 0;
1586 vc->vc_color = vc->vc_def_color;
1587 }
1588
1589 struct rgb { u8 r; u8 g; u8 b; };
1590
1591 static void rgb_from_256(int i, struct rgb *c)
1592 {
1593 if (i < 8) { /* Standard colours. */
1594 c->r = i&1 ? 0xaa : 0x00;
1595 c->g = i&2 ? 0xaa : 0x00;
1596 c->b = i&4 ? 0xaa : 0x00;
1597 } else if (i < 16) {
1598 c->r = i&1 ? 0xff : 0x55;
1599 c->g = i&2 ? 0xff : 0x55;
1600 c->b = i&4 ? 0xff : 0x55;
1601 } else if (i < 232) { /* 6x6x6 colour cube. */
1602 c->r = (i - 16) / 36 * 85 / 2;
1603 c->g = (i - 16) / 6 % 6 * 85 / 2;
1604 c->b = (i - 16) % 6 * 85 / 2;
1605 } else /* Grayscale ramp. */
1606 c->r = c->g = c->b = i * 10 - 2312;
1607 }
1608
1609 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1610 {
1611 u8 hue = 0, max = max3(c->r, c->g, c->b);
1612
1613 if (c->r > max / 2)
1614 hue |= 4;
1615 if (c->g > max / 2)
1616 hue |= 2;
1617 if (c->b > max / 2)
1618 hue |= 1;
1619
1620 if (hue == 7 && max <= 0x55) {
1621 hue = 0;
1622 vc->vc_intensity = 2;
1623 } else if (max > 0xaa)
1624 vc->vc_intensity = 2;
1625 else
1626 vc->vc_intensity = 1;
1627
1628 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1629 }
1630
1631 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1632 {
1633 /* For backgrounds, err on the dark side. */
1634 vc->vc_color = (vc->vc_color & 0x0f)
1635 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1636 }
1637
1638 /*
1639 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1640 * and thus need to be detected and ignored by hand. That standard also
1641 * wants : rather than ; as separators but sequences containing : are currently
1642 * completely ignored by the parser.
1643 *
1644 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1645 * supporting them.
1646 */
1647 static int vc_t416_color(struct vc_data *vc, int i,
1648 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1649 {
1650 struct rgb c;
1651
1652 i++;
1653 if (i > vc->vc_npar)
1654 return i;
1655
1656 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1657 /* 256 colours */
1658 i++;
1659 rgb_from_256(vc->vc_par[i], &c);
1660 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1661 /* 24 bit */
1662 c.r = vc->vc_par[i + 1];
1663 c.g = vc->vc_par[i + 2];
1664 c.b = vc->vc_par[i + 3];
1665 i += 3;
1666 } else
1667 return i;
1668
1669 set_color(vc, &c);
1670
1671 return i;
1672 }
1673
1674 /* console_lock is held */
1675 static void csi_m(struct vc_data *vc)
1676 {
1677 int i;
1678
1679 for (i = 0; i <= vc->vc_npar; i++)
1680 switch (vc->vc_par[i]) {
1681 case 0: /* all attributes off */
1682 default_attr(vc);
1683 break;
1684 case 1:
1685 vc->vc_intensity = 2;
1686 break;
1687 case 2:
1688 vc->vc_intensity = 0;
1689 break;
1690 case 3:
1691 vc->vc_italic = 1;
1692 break;
1693 case 21:
1694 /*
1695 * No console drivers support double underline, so
1696 * convert it to a single underline.
1697 */
1698 case 4:
1699 vc->vc_underline = 1;
1700 break;
1701 case 5:
1702 vc->vc_blink = 1;
1703 break;
1704 case 7:
1705 vc->vc_reverse = 1;
1706 break;
1707 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1708 * Select primary font, don't display control chars if
1709 * defined, don't set bit 8 on output.
1710 */
1711 vc->vc_translate = set_translate(vc->vc_charset == 0
1712 ? vc->vc_G0_charset
1713 : vc->vc_G1_charset, vc);
1714 vc->vc_disp_ctrl = 0;
1715 vc->vc_toggle_meta = 0;
1716 break;
1717 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1718 * Select first alternate font, lets chars < 32 be
1719 * displayed as ROM chars.
1720 */
1721 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1722 vc->vc_disp_ctrl = 1;
1723 vc->vc_toggle_meta = 0;
1724 break;
1725 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1726 * Select second alternate font, toggle high bit
1727 * before displaying as ROM char.
1728 */
1729 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1730 vc->vc_disp_ctrl = 1;
1731 vc->vc_toggle_meta = 1;
1732 break;
1733 case 22:
1734 vc->vc_intensity = 1;
1735 break;
1736 case 23:
1737 vc->vc_italic = 0;
1738 break;
1739 case 24:
1740 vc->vc_underline = 0;
1741 break;
1742 case 25:
1743 vc->vc_blink = 0;
1744 break;
1745 case 27:
1746 vc->vc_reverse = 0;
1747 break;
1748 case 38:
1749 i = vc_t416_color(vc, i, rgb_foreground);
1750 break;
1751 case 48:
1752 i = vc_t416_color(vc, i, rgb_background);
1753 break;
1754 case 39:
1755 vc->vc_color = (vc->vc_def_color & 0x0f) |
1756 (vc->vc_color & 0xf0);
1757 break;
1758 case 49:
1759 vc->vc_color = (vc->vc_def_color & 0xf0) |
1760 (vc->vc_color & 0x0f);
1761 break;
1762 default:
1763 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1764 if (vc->vc_par[i] < 100)
1765 vc->vc_intensity = 2;
1766 vc->vc_par[i] -= 60;
1767 }
1768 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1769 vc->vc_color = color_table[vc->vc_par[i] - 30]
1770 | (vc->vc_color & 0xf0);
1771 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1772 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1773 | (vc->vc_color & 0x0f);
1774 break;
1775 }
1776 update_attr(vc);
1777 }
1778
1779 static void respond_string(const char *p, struct tty_port *port)
1780 {
1781 while (*p) {
1782 tty_insert_flip_char(port, *p, 0);
1783 p++;
1784 }
1785 tty_schedule_flip(port);
1786 }
1787
1788 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1789 {
1790 char buf[40];
1791
1792 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1793 respond_string(buf, tty->port);
1794 }
1795
1796 static inline void status_report(struct tty_struct *tty)
1797 {
1798 respond_string("\033[0n", tty->port); /* Terminal ok */
1799 }
1800
1801 static inline void respond_ID(struct tty_struct *tty)
1802 {
1803 respond_string(VT102ID, tty->port);
1804 }
1805
1806 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1807 {
1808 char buf[8];
1809
1810 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1811 (char)('!' + mry));
1812 respond_string(buf, tty->port);
1813 }
1814
1815 /* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1816 int mouse_reporting(void)
1817 {
1818 return vc_cons[fg_console].d->vc_report_mouse;
1819 }
1820
1821 /* console_lock is held */
1822 static void set_mode(struct vc_data *vc, int on_off)
1823 {
1824 int i;
1825
1826 for (i = 0; i <= vc->vc_npar; i++)
1827 if (vc->vc_priv == EPdec) {
1828 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1829 case 1: /* Cursor keys send ^[Ox/^[[x */
1830 if (on_off)
1831 set_kbd(vc, decckm);
1832 else
1833 clr_kbd(vc, decckm);
1834 break;
1835 case 3: /* 80/132 mode switch unimplemented */
1836 #if 0
1837 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1838 /* this alone does not suffice; some user mode
1839 utility has to change the hardware regs */
1840 #endif
1841 break;
1842 case 5: /* Inverted screen on/off */
1843 if (vc->vc_decscnm != on_off) {
1844 vc->vc_decscnm = on_off;
1845 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1846 update_attr(vc);
1847 }
1848 break;
1849 case 6: /* Origin relative/absolute */
1850 vc->vc_decom = on_off;
1851 gotoxay(vc, 0, 0);
1852 break;
1853 case 7: /* Autowrap on/off */
1854 vc->vc_decawm = on_off;
1855 break;
1856 case 8: /* Autorepeat on/off */
1857 if (on_off)
1858 set_kbd(vc, decarm);
1859 else
1860 clr_kbd(vc, decarm);
1861 break;
1862 case 9:
1863 vc->vc_report_mouse = on_off ? 1 : 0;
1864 break;
1865 case 25: /* Cursor on/off */
1866 vc->vc_deccm = on_off;
1867 break;
1868 case 1000:
1869 vc->vc_report_mouse = on_off ? 2 : 0;
1870 break;
1871 }
1872 } else {
1873 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1874 case 3: /* Monitor (display ctrls) */
1875 vc->vc_disp_ctrl = on_off;
1876 break;
1877 case 4: /* Insert Mode on/off */
1878 vc->vc_decim = on_off;
1879 break;
1880 case 20: /* Lf, Enter == CrLf/Lf */
1881 if (on_off)
1882 set_kbd(vc, lnm);
1883 else
1884 clr_kbd(vc, lnm);
1885 break;
1886 }
1887 }
1888 }
1889
1890 /* console_lock is held */
1891 static void setterm_command(struct vc_data *vc)
1892 {
1893 switch(vc->vc_par[0]) {
1894 case 1: /* set color for underline mode */
1895 if (vc->vc_can_do_color &&
1896 vc->vc_par[1] < 16) {
1897 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1898 if (vc->vc_underline)
1899 update_attr(vc);
1900 }
1901 break;
1902 case 2: /* set color for half intensity mode */
1903 if (vc->vc_can_do_color &&
1904 vc->vc_par[1] < 16) {
1905 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1906 if (vc->vc_intensity == 0)
1907 update_attr(vc);
1908 }
1909 break;
1910 case 8: /* store colors as defaults */
1911 vc->vc_def_color = vc->vc_attr;
1912 if (vc->vc_hi_font_mask == 0x100)
1913 vc->vc_def_color >>= 1;
1914 default_attr(vc);
1915 update_attr(vc);
1916 break;
1917 case 9: /* set blanking interval */
1918 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1919 poke_blanked_console();
1920 break;
1921 case 10: /* set bell frequency in Hz */
1922 if (vc->vc_npar >= 1)
1923 vc->vc_bell_pitch = vc->vc_par[1];
1924 else
1925 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1926 break;
1927 case 11: /* set bell duration in msec */
1928 if (vc->vc_npar >= 1)
1929 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1930 msecs_to_jiffies(vc->vc_par[1]) : 0;
1931 else
1932 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1933 break;
1934 case 12: /* bring specified console to the front */
1935 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1936 set_console(vc->vc_par[1] - 1);
1937 break;
1938 case 13: /* unblank the screen */
1939 poke_blanked_console();
1940 break;
1941 case 14: /* set vesa powerdown interval */
1942 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1943 break;
1944 case 15: /* activate the previous console */
1945 set_console(last_console);
1946 break;
1947 case 16: /* set cursor blink duration in msec */
1948 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1949 vc->vc_par[1] <= USHRT_MAX)
1950 vc->vc_cur_blink_ms = vc->vc_par[1];
1951 else
1952 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1953 break;
1954 }
1955 }
1956
1957 /* console_lock is held */
1958 static void csi_at(struct vc_data *vc, unsigned int nr)
1959 {
1960 if (nr > vc->vc_cols - vc->vc_x)
1961 nr = vc->vc_cols - vc->vc_x;
1962 else if (!nr)
1963 nr = 1;
1964 insert_char(vc, nr);
1965 }
1966
1967 /* console_lock is held */
1968 static void csi_L(struct vc_data *vc, unsigned int nr)
1969 {
1970 if (nr > vc->vc_rows - vc->vc_y)
1971 nr = vc->vc_rows - vc->vc_y;
1972 else if (!nr)
1973 nr = 1;
1974 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1975 vc->vc_need_wrap = 0;
1976 }
1977
1978 /* console_lock is held */
1979 static void csi_P(struct vc_data *vc, unsigned int nr)
1980 {
1981 if (nr > vc->vc_cols - vc->vc_x)
1982 nr = vc->vc_cols - vc->vc_x;
1983 else if (!nr)
1984 nr = 1;
1985 delete_char(vc, nr);
1986 }
1987
1988 /* console_lock is held */
1989 static void csi_M(struct vc_data *vc, unsigned int nr)
1990 {
1991 if (nr > vc->vc_rows - vc->vc_y)
1992 nr = vc->vc_rows - vc->vc_y;
1993 else if (!nr)
1994 nr=1;
1995 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1996 vc->vc_need_wrap = 0;
1997 }
1998
1999 /* console_lock is held (except via vc_init->reset_terminal */
2000 static void save_cur(struct vc_data *vc)
2001 {
2002 vc->vc_saved_x = vc->vc_x;
2003 vc->vc_saved_y = vc->vc_y;
2004 vc->vc_s_intensity = vc->vc_intensity;
2005 vc->vc_s_italic = vc->vc_italic;
2006 vc->vc_s_underline = vc->vc_underline;
2007 vc->vc_s_blink = vc->vc_blink;
2008 vc->vc_s_reverse = vc->vc_reverse;
2009 vc->vc_s_charset = vc->vc_charset;
2010 vc->vc_s_color = vc->vc_color;
2011 vc->vc_saved_G0 = vc->vc_G0_charset;
2012 vc->vc_saved_G1 = vc->vc_G1_charset;
2013 }
2014
2015 /* console_lock is held */
2016 static void restore_cur(struct vc_data *vc)
2017 {
2018 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
2019 vc->vc_intensity = vc->vc_s_intensity;
2020 vc->vc_italic = vc->vc_s_italic;
2021 vc->vc_underline = vc->vc_s_underline;
2022 vc->vc_blink = vc->vc_s_blink;
2023 vc->vc_reverse = vc->vc_s_reverse;
2024 vc->vc_charset = vc->vc_s_charset;
2025 vc->vc_color = vc->vc_s_color;
2026 vc->vc_G0_charset = vc->vc_saved_G0;
2027 vc->vc_G1_charset = vc->vc_saved_G1;
2028 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
2029 update_attr(vc);
2030 vc->vc_need_wrap = 0;
2031 }
2032
2033 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2034 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2035 ESpalette, ESosc };
2036
2037 /* console_lock is held (except via vc_init()) */
2038 static void reset_terminal(struct vc_data *vc, int do_clear)
2039 {
2040 vc->vc_top = 0;
2041 vc->vc_bottom = vc->vc_rows;
2042 vc->vc_state = ESnormal;
2043 vc->vc_priv = EPecma;
2044 vc->vc_translate = set_translate(LAT1_MAP, vc);
2045 vc->vc_G0_charset = LAT1_MAP;
2046 vc->vc_G1_charset = GRAF_MAP;
2047 vc->vc_charset = 0;
2048 vc->vc_need_wrap = 0;
2049 vc->vc_report_mouse = 0;
2050 vc->vc_utf = default_utf8;
2051 vc->vc_utf_count = 0;
2052
2053 vc->vc_disp_ctrl = 0;
2054 vc->vc_toggle_meta = 0;
2055
2056 vc->vc_decscnm = 0;
2057 vc->vc_decom = 0;
2058 vc->vc_decawm = 1;
2059 vc->vc_deccm = global_cursor_default;
2060 vc->vc_decim = 0;
2061
2062 vt_reset_keyboard(vc->vc_num);
2063
2064 vc->vc_cursor_type = cur_default;
2065 vc->vc_complement_mask = vc->vc_s_complement_mask;
2066
2067 default_attr(vc);
2068 update_attr(vc);
2069
2070 vc->vc_tab_stop[0] =
2071 vc->vc_tab_stop[1] =
2072 vc->vc_tab_stop[2] =
2073 vc->vc_tab_stop[3] =
2074 vc->vc_tab_stop[4] =
2075 vc->vc_tab_stop[5] =
2076 vc->vc_tab_stop[6] =
2077 vc->vc_tab_stop[7] = 0x01010101;
2078
2079 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2080 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2081 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2082
2083 gotoxy(vc, 0, 0);
2084 save_cur(vc);
2085 if (do_clear)
2086 csi_J(vc, 2);
2087 }
2088
2089 /* console_lock is held */
2090 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2091 {
2092 /*
2093 * Control characters can be used in the _middle_
2094 * of an escape sequence.
2095 */
2096 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2097 return;
2098 switch (c) {
2099 case 0:
2100 return;
2101 case 7:
2102 if (vc->vc_state == ESosc)
2103 vc->vc_state = ESnormal;
2104 else if (vc->vc_bell_duration)
2105 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2106 return;
2107 case 8:
2108 bs(vc);
2109 return;
2110 case 9:
2111 vc->vc_pos -= (vc->vc_x << 1);
2112 while (vc->vc_x < vc->vc_cols - 1) {
2113 vc->vc_x++;
2114 if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
2115 break;
2116 }
2117 vc->vc_pos += (vc->vc_x << 1);
2118 notify_write(vc, '\t');
2119 return;
2120 case 10: case 11: case 12:
2121 lf(vc);
2122 if (!is_kbd(vc, lnm))
2123 return;
2124 /* fall through */
2125 case 13:
2126 cr(vc);
2127 return;
2128 case 14:
2129 vc->vc_charset = 1;
2130 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2131 vc->vc_disp_ctrl = 1;
2132 return;
2133 case 15:
2134 vc->vc_charset = 0;
2135 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2136 vc->vc_disp_ctrl = 0;
2137 return;
2138 case 24: case 26:
2139 vc->vc_state = ESnormal;
2140 return;
2141 case 27:
2142 vc->vc_state = ESesc;
2143 return;
2144 case 127:
2145 del(vc);
2146 return;
2147 case 128+27:
2148 vc->vc_state = ESsquare;
2149 return;
2150 }
2151 switch(vc->vc_state) {
2152 case ESesc:
2153 vc->vc_state = ESnormal;
2154 switch (c) {
2155 case '[':
2156 vc->vc_state = ESsquare;
2157 return;
2158 case ']':
2159 vc->vc_state = ESnonstd;
2160 return;
2161 case '%':
2162 vc->vc_state = ESpercent;
2163 return;
2164 case 'E':
2165 cr(vc);
2166 lf(vc);
2167 return;
2168 case 'M':
2169 ri(vc);
2170 return;
2171 case 'D':
2172 lf(vc);
2173 return;
2174 case 'H':
2175 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
2176 return;
2177 case 'Z':
2178 respond_ID(tty);
2179 return;
2180 case '7':
2181 save_cur(vc);
2182 return;
2183 case '8':
2184 restore_cur(vc);
2185 return;
2186 case '(':
2187 vc->vc_state = ESsetG0;
2188 return;
2189 case ')':
2190 vc->vc_state = ESsetG1;
2191 return;
2192 case '#':
2193 vc->vc_state = EShash;
2194 return;
2195 case 'c':
2196 reset_terminal(vc, 1);
2197 return;
2198 case '>': /* Numeric keypad */
2199 clr_kbd(vc, kbdapplic);
2200 return;
2201 case '=': /* Appl. keypad */
2202 set_kbd(vc, kbdapplic);
2203 return;
2204 }
2205 return;
2206 case ESnonstd:
2207 if (c=='P') { /* palette escape sequence */
2208 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2209 vc->vc_par[vc->vc_npar] = 0;
2210 vc->vc_npar = 0;
2211 vc->vc_state = ESpalette;
2212 return;
2213 } else if (c=='R') { /* reset palette */
2214 reset_palette(vc);
2215 vc->vc_state = ESnormal;
2216 } else if (c>='0' && c<='9')
2217 vc->vc_state = ESosc;
2218 else
2219 vc->vc_state = ESnormal;
2220 return;
2221 case ESpalette:
2222 if (isxdigit(c)) {
2223 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2224 if (vc->vc_npar == 7) {
2225 int i = vc->vc_par[0] * 3, j = 1;
2226 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2227 vc->vc_palette[i++] += vc->vc_par[j++];
2228 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2229 vc->vc_palette[i++] += vc->vc_par[j++];
2230 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2231 vc->vc_palette[i] += vc->vc_par[j];
2232 set_palette(vc);
2233 vc->vc_state = ESnormal;
2234 }
2235 } else
2236 vc->vc_state = ESnormal;
2237 return;
2238 case ESsquare:
2239 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2240 vc->vc_par[vc->vc_npar] = 0;
2241 vc->vc_npar = 0;
2242 vc->vc_state = ESgetpars;
2243 if (c == '[') { /* Function key */
2244 vc->vc_state=ESfunckey;
2245 return;
2246 }
2247 switch (c) {
2248 case '?':
2249 vc->vc_priv = EPdec;
2250 return;
2251 case '>':
2252 vc->vc_priv = EPgt;
2253 return;
2254 case '=':
2255 vc->vc_priv = EPeq;
2256 return;
2257 case '<':
2258 vc->vc_priv = EPlt;
2259 return;
2260 }
2261 vc->vc_priv = EPecma;
2262 /* fall through */
2263 case ESgetpars:
2264 if (c == ';' && vc->vc_npar < NPAR - 1) {
2265 vc->vc_npar++;
2266 return;
2267 } else if (c>='0' && c<='9') {
2268 vc->vc_par[vc->vc_npar] *= 10;
2269 vc->vc_par[vc->vc_npar] += c - '0';
2270 return;
2271 }
2272 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2273 vc->vc_state = EScsiignore;
2274 return;
2275 }
2276 vc->vc_state = ESnormal;
2277 switch(c) {
2278 case 'h':
2279 if (vc->vc_priv <= EPdec)
2280 set_mode(vc, 1);
2281 return;
2282 case 'l':
2283 if (vc->vc_priv <= EPdec)
2284 set_mode(vc, 0);
2285 return;
2286 case 'c':
2287 if (vc->vc_priv == EPdec) {
2288 if (vc->vc_par[0])
2289 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
2290 else
2291 vc->vc_cursor_type = cur_default;
2292 return;
2293 }
2294 break;
2295 case 'm':
2296 if (vc->vc_priv == EPdec) {
2297 clear_selection();
2298 if (vc->vc_par[0])
2299 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2300 else
2301 vc->vc_complement_mask = vc->vc_s_complement_mask;
2302 return;
2303 }
2304 break;
2305 case 'n':
2306 if (vc->vc_priv == EPecma) {
2307 if (vc->vc_par[0] == 5)
2308 status_report(tty);
2309 else if (vc->vc_par[0] == 6)
2310 cursor_report(vc, tty);
2311 }
2312 return;
2313 }
2314 if (vc->vc_priv != EPecma) {
2315 vc->vc_priv = EPecma;
2316 return;
2317 }
2318 switch(c) {
2319 case 'G': case '`':
2320 if (vc->vc_par[0])
2321 vc->vc_par[0]--;
2322 gotoxy(vc, vc->vc_par[0], vc->vc_y);
2323 return;
2324 case 'A':
2325 if (!vc->vc_par[0])
2326 vc->vc_par[0]++;
2327 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2328 return;
2329 case 'B': case 'e':
2330 if (!vc->vc_par[0])
2331 vc->vc_par[0]++;
2332 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2333 return;
2334 case 'C': case 'a':
2335 if (!vc->vc_par[0])
2336 vc->vc_par[0]++;
2337 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2338 return;
2339 case 'D':
2340 if (!vc->vc_par[0])
2341 vc->vc_par[0]++;
2342 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2343 return;
2344 case 'E':
2345 if (!vc->vc_par[0])
2346 vc->vc_par[0]++;
2347 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2348 return;
2349 case 'F':
2350 if (!vc->vc_par[0])
2351 vc->vc_par[0]++;
2352 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2353 return;
2354 case 'd':
2355 if (vc->vc_par[0])
2356 vc->vc_par[0]--;
2357 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2358 return;
2359 case 'H': case 'f':
2360 if (vc->vc_par[0])
2361 vc->vc_par[0]--;
2362 if (vc->vc_par[1])
2363 vc->vc_par[1]--;
2364 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2365 return;
2366 case 'J':
2367 csi_J(vc, vc->vc_par[0]);
2368 return;
2369 case 'K':
2370 csi_K(vc, vc->vc_par[0]);
2371 return;
2372 case 'L':
2373 csi_L(vc, vc->vc_par[0]);
2374 return;
2375 case 'M':
2376 csi_M(vc, vc->vc_par[0]);
2377 return;
2378 case 'P':
2379 csi_P(vc, vc->vc_par[0]);
2380 return;
2381 case 'c':
2382 if (!vc->vc_par[0])
2383 respond_ID(tty);
2384 return;
2385 case 'g':
2386 if (!vc->vc_par[0])
2387 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2388 else if (vc->vc_par[0] == 3) {
2389 vc->vc_tab_stop[0] =
2390 vc->vc_tab_stop[1] =
2391 vc->vc_tab_stop[2] =
2392 vc->vc_tab_stop[3] =
2393 vc->vc_tab_stop[4] =
2394 vc->vc_tab_stop[5] =
2395 vc->vc_tab_stop[6] =
2396 vc->vc_tab_stop[7] = 0;
2397 }
2398 return;
2399 case 'm':
2400 csi_m(vc);
2401 return;
2402 case 'q': /* DECLL - but only 3 leds */
2403 /* map 0,1,2,3 to 0,1,2,4 */
2404 if (vc->vc_par[0] < 4)
2405 vt_set_led_state(vc->vc_num,
2406 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2407 return;
2408 case 'r':
2409 if (!vc->vc_par[0])
2410 vc->vc_par[0]++;
2411 if (!vc->vc_par[1])
2412 vc->vc_par[1] = vc->vc_rows;
2413 /* Minimum allowed region is 2 lines */
2414 if (vc->vc_par[0] < vc->vc_par[1] &&
2415 vc->vc_par[1] <= vc->vc_rows) {
2416 vc->vc_top = vc->vc_par[0] - 1;
2417 vc->vc_bottom = vc->vc_par[1];
2418 gotoxay(vc, 0, 0);
2419 }
2420 return;
2421 case 's':
2422 save_cur(vc);
2423 return;
2424 case 'u':
2425 restore_cur(vc);
2426 return;
2427 case 'X':
2428 csi_X(vc, vc->vc_par[0]);
2429 return;
2430 case '@':
2431 csi_at(vc, vc->vc_par[0]);
2432 return;
2433 case ']': /* setterm functions */
2434 setterm_command(vc);
2435 return;
2436 }
2437 return;
2438 case EScsiignore:
2439 if (c >= 20 && c <= 0x3f)
2440 return;
2441 vc->vc_state = ESnormal;
2442 return;
2443 case ESpercent:
2444 vc->vc_state = ESnormal;
2445 switch (c) {
2446 case '@': /* defined in ISO 2022 */
2447 vc->vc_utf = 0;
2448 return;
2449 case 'G': /* prelim official escape code */
2450 case '8': /* retained for compatibility */
2451 vc->vc_utf = 1;
2452 return;
2453 }
2454 return;
2455 case ESfunckey:
2456 vc->vc_state = ESnormal;
2457 return;
2458 case EShash:
2459 vc->vc_state = ESnormal;
2460 if (c == '8') {
2461 /* DEC screen alignment test. kludge :-) */
2462 vc->vc_video_erase_char =
2463 (vc->vc_video_erase_char & 0xff00) | 'E';
2464 csi_J(vc, 2);
2465 vc->vc_video_erase_char =
2466 (vc->vc_video_erase_char & 0xff00) | ' ';
2467 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2468 }
2469 return;
2470 case ESsetG0:
2471 if (c == '0')
2472 vc->vc_G0_charset = GRAF_MAP;
2473 else if (c == 'B')
2474 vc->vc_G0_charset = LAT1_MAP;
2475 else if (c == 'U')
2476 vc->vc_G0_charset = IBMPC_MAP;
2477 else if (c == 'K')
2478 vc->vc_G0_charset = USER_MAP;
2479 if (vc->vc_charset == 0)
2480 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2481 vc->vc_state = ESnormal;
2482 return;
2483 case ESsetG1:
2484 if (c == '0')
2485 vc->vc_G1_charset = GRAF_MAP;
2486 else if (c == 'B')
2487 vc->vc_G1_charset = LAT1_MAP;
2488 else if (c == 'U')
2489 vc->vc_G1_charset = IBMPC_MAP;
2490 else if (c == 'K')
2491 vc->vc_G1_charset = USER_MAP;
2492 if (vc->vc_charset == 1)
2493 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2494 vc->vc_state = ESnormal;
2495 return;
2496 case ESosc:
2497 return;
2498 default:
2499 vc->vc_state = ESnormal;
2500 }
2501 }
2502
2503 /* is_double_width() is based on the wcwidth() implementation by
2504 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2505 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2506 */
2507 struct interval {
2508 uint32_t first;
2509 uint32_t last;
2510 };
2511
2512 static int ucs_cmp(const void *key, const void *elt)
2513 {
2514 uint32_t ucs = *(uint32_t *)key;
2515 struct interval e = *(struct interval *) elt;
2516
2517 if (ucs > e.last)
2518 return 1;
2519 else if (ucs < e.first)
2520 return -1;
2521 return 0;
2522 }
2523
2524 static int is_double_width(uint32_t ucs)
2525 {
2526 static const struct interval double_width[] = {
2527 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2528 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2529 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2530 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2531 };
2532 if (ucs < double_width[0].first ||
2533 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2534 return 0;
2535
2536 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2537 sizeof(struct interval), ucs_cmp) != NULL;
2538 }
2539
2540 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2541 unsigned long draw_to, int *draw_x)
2542 {
2543 if (*draw_x < 0)
2544 return;
2545
2546 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2547 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2548 *draw_x = -1;
2549 }
2550
2551 /* acquires console_lock */
2552 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2553 {
2554 int c, next_c, tc, ok, n = 0, draw_x = -1;
2555 unsigned int currcons;
2556 unsigned long draw_from = 0, draw_to = 0;
2557 struct vc_data *vc;
2558 unsigned char vc_attr;
2559 struct vt_notifier_param param;
2560 uint8_t rescan;
2561 uint8_t inverse;
2562 uint8_t width;
2563 u16 himask, charmask;
2564
2565 if (in_interrupt())
2566 return count;
2567
2568 might_sleep();
2569
2570 console_lock();
2571 vc = tty->driver_data;
2572 if (vc == NULL) {
2573 pr_err("vt: argh, driver_data is NULL !\n");
2574 console_unlock();
2575 return 0;
2576 }
2577
2578 currcons = vc->vc_num;
2579 if (!vc_cons_allocated(currcons)) {
2580 /* could this happen? */
2581 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2582 console_unlock();
2583 return 0;
2584 }
2585
2586 himask = vc->vc_hi_font_mask;
2587 charmask = himask ? 0x1ff : 0xff;
2588
2589 /* undraw cursor first */
2590 if (con_is_fg(vc))
2591 hide_cursor(vc);
2592
2593 param.vc = vc;
2594
2595 while (!tty->stopped && count) {
2596 int orig = *buf;
2597 c = orig;
2598 buf++;
2599 n++;
2600 count--;
2601 rescan = 0;
2602 inverse = 0;
2603 width = 1;
2604
2605 /* Do no translation at all in control states */
2606 if (vc->vc_state != ESnormal) {
2607 tc = c;
2608 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2609 /* Combine UTF-8 into Unicode in vc_utf_char.
2610 * vc_utf_count is the number of continuation bytes still
2611 * expected to arrive.
2612 * vc_npar is the number of continuation bytes arrived so
2613 * far
2614 */
2615 rescan_last_byte:
2616 if ((c & 0xc0) == 0x80) {
2617 /* Continuation byte received */
2618 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2619 if (vc->vc_utf_count) {
2620 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2621 vc->vc_npar++;
2622 if (--vc->vc_utf_count) {
2623 /* Still need some bytes */
2624 continue;
2625 }
2626 /* Got a whole character */
2627 c = vc->vc_utf_char;
2628 /* Reject overlong sequences */
2629 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2630 c > utf8_length_changes[vc->vc_npar])
2631 c = 0xfffd;
2632 } else {
2633 /* Unexpected continuation byte */
2634 vc->vc_utf_count = 0;
2635 c = 0xfffd;
2636 }
2637 } else {
2638 /* Single ASCII byte or first byte of a sequence received */
2639 if (vc->vc_utf_count) {
2640 /* Continuation byte expected */
2641 rescan = 1;
2642 vc->vc_utf_count = 0;
2643 c = 0xfffd;
2644 } else if (c > 0x7f) {
2645 /* First byte of a multibyte sequence received */
2646 vc->vc_npar = 0;
2647 if ((c & 0xe0) == 0xc0) {
2648 vc->vc_utf_count = 1;
2649 vc->vc_utf_char = (c & 0x1f);
2650 } else if ((c & 0xf0) == 0xe0) {
2651 vc->vc_utf_count = 2;
2652 vc->vc_utf_char = (c & 0x0f);
2653 } else if ((c & 0xf8) == 0xf0) {
2654 vc->vc_utf_count = 3;
2655 vc->vc_utf_char = (c & 0x07);
2656 } else if ((c & 0xfc) == 0xf8) {
2657 vc->vc_utf_count = 4;
2658 vc->vc_utf_char = (c & 0x03);
2659 } else if ((c & 0xfe) == 0xfc) {
2660 vc->vc_utf_count = 5;
2661 vc->vc_utf_char = (c & 0x01);
2662 } else {
2663 /* 254 and 255 are invalid */
2664 c = 0xfffd;
2665 }
2666 if (vc->vc_utf_count) {
2667 /* Still need some bytes */
2668 continue;
2669 }
2670 }
2671 /* Nothing to do if an ASCII byte was received */
2672 }
2673 /* End of UTF-8 decoding. */
2674 /* c is the received character, or U+FFFD for invalid sequences. */
2675 /* Replace invalid Unicode code points with U+FFFD too */
2676 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2677 c = 0xfffd;
2678 tc = c;
2679 } else { /* no utf or alternate charset mode */
2680 tc = vc_translate(vc, c);
2681 }
2682
2683 param.c = tc;
2684 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2685 &param) == NOTIFY_STOP)
2686 continue;
2687
2688 /* If the original code was a control character we
2689 * only allow a glyph to be displayed if the code is
2690 * not normally used (such as for cursor movement) or
2691 * if the disp_ctrl mode has been explicitly enabled.
2692 * Certain characters (as given by the CTRL_ALWAYS
2693 * bitmap) are always displayed as control characters,
2694 * as the console would be pretty useless without
2695 * them; to display an arbitrary font position use the
2696 * direct-to-font zone in UTF-8 mode.
2697 */
2698 ok = tc && (c >= 32 ||
2699 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2700 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2701 && (c != 127 || vc->vc_disp_ctrl)
2702 && (c != 128+27);
2703
2704 if (vc->vc_state == ESnormal && ok) {
2705 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2706 if (is_double_width(c))
2707 width = 2;
2708 }
2709 /* Now try to find out how to display it */
2710 tc = conv_uni_to_pc(vc, tc);
2711 if (tc & ~charmask) {
2712 if (tc == -1 || tc == -2) {
2713 continue; /* nothing to display */
2714 }
2715 /* Glyph not found */
2716 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2717 /* In legacy mode use the glyph we get by a 1:1 mapping.
2718 This would make absolutely no sense with Unicode in mind,
2719 but do this for ASCII characters since a font may lack
2720 Unicode mapping info and we don't want to end up with
2721 having question marks only. */
2722 tc = c;
2723 } else {
2724 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2725 tc = conv_uni_to_pc(vc, 0xfffd);
2726 if (tc < 0) {
2727 inverse = 1;
2728 tc = conv_uni_to_pc(vc, '?');
2729 if (tc < 0) tc = '?';
2730 }
2731 }
2732 }
2733
2734 if (!inverse) {
2735 vc_attr = vc->vc_attr;
2736 } else {
2737 /* invert vc_attr */
2738 if (!vc->vc_can_do_color) {
2739 vc_attr = (vc->vc_attr) ^ 0x08;
2740 } else if (vc->vc_hi_font_mask == 0x100) {
2741 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2742 } else {
2743 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2744 }
2745 con_flush(vc, draw_from, draw_to, &draw_x);
2746 }
2747
2748 next_c = c;
2749 while (1) {
2750 if (vc->vc_need_wrap || vc->vc_decim)
2751 con_flush(vc, draw_from, draw_to,
2752 &draw_x);
2753 if (vc->vc_need_wrap) {
2754 cr(vc);
2755 lf(vc);
2756 }
2757 if (vc->vc_decim)
2758 insert_char(vc, 1);
2759 vc_uniscr_putc(vc, next_c);
2760 scr_writew(himask ?
2761 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2762 (vc_attr << 8) + tc,
2763 (u16 *) vc->vc_pos);
2764 if (con_should_update(vc) && draw_x < 0) {
2765 draw_x = vc->vc_x;
2766 draw_from = vc->vc_pos;
2767 }
2768 if (vc->vc_x == vc->vc_cols - 1) {
2769 vc->vc_need_wrap = vc->vc_decawm;
2770 draw_to = vc->vc_pos + 2;
2771 } else {
2772 vc->vc_x++;
2773 draw_to = (vc->vc_pos += 2);
2774 }
2775
2776 if (!--width) break;
2777
2778 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2779 if (tc < 0) tc = ' ';
2780 next_c = ' ';
2781 }
2782 notify_write(vc, c);
2783
2784 if (inverse)
2785 con_flush(vc, draw_from, draw_to, &draw_x);
2786
2787 if (rescan) {
2788 rescan = 0;
2789 inverse = 0;
2790 width = 1;
2791 c = orig;
2792 goto rescan_last_byte;
2793 }
2794 continue;
2795 }
2796 con_flush(vc, draw_from, draw_to, &draw_x);
2797 do_con_trol(tty, vc, orig);
2798 }
2799 con_flush(vc, draw_from, draw_to, &draw_x);
2800 vc_uniscr_debug_check(vc);
2801 console_conditional_schedule();
2802 notify_update(vc);
2803 console_unlock();
2804 return n;
2805 }
2806
2807 /*
2808 * This is the console switching callback.
2809 *
2810 * Doing console switching in a process context allows
2811 * us to do the switches asynchronously (needed when we want
2812 * to switch due to a keyboard interrupt). Synchronization
2813 * with other console code and prevention of re-entrancy is
2814 * ensured with console_lock.
2815 */
2816 static void console_callback(struct work_struct *ignored)
2817 {
2818 console_lock();
2819
2820 if (want_console >= 0) {
2821 if (want_console != fg_console &&
2822 vc_cons_allocated(want_console)) {
2823 hide_cursor(vc_cons[fg_console].d);
2824 change_console(vc_cons[want_console].d);
2825 /* we only changed when the console had already
2826 been allocated - a new console is not created
2827 in an interrupt routine */
2828 }
2829 want_console = -1;
2830 }
2831 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2832 do_poke_blanked_console = 0;
2833 poke_blanked_console();
2834 }
2835 if (scrollback_delta) {
2836 struct vc_data *vc = vc_cons[fg_console].d;
2837 clear_selection();
2838 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2839 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2840 scrollback_delta = 0;
2841 }
2842 if (blank_timer_expired) {
2843 do_blank_screen(0);
2844 blank_timer_expired = 0;
2845 }
2846 notify_update(vc_cons[fg_console].d);
2847
2848 console_unlock();
2849 }
2850
2851 int set_console(int nr)
2852 {
2853 struct vc_data *vc = vc_cons[fg_console].d;
2854
2855 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2856 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2857
2858 /*
2859 * Console switch will fail in console_callback() or
2860 * change_console() so there is no point scheduling
2861 * the callback
2862 *
2863 * Existing set_console() users don't check the return
2864 * value so this shouldn't break anything
2865 */
2866 return -EINVAL;
2867 }
2868
2869 want_console = nr;
2870 schedule_console_callback();
2871
2872 return 0;
2873 }
2874
2875 struct tty_driver *console_driver;
2876
2877 #ifdef CONFIG_VT_CONSOLE
2878
2879 /**
2880 * vt_kmsg_redirect() - Sets/gets the kernel message console
2881 * @new: The new virtual terminal number or -1 if the console should stay
2882 * unchanged
2883 *
2884 * By default, the kernel messages are always printed on the current virtual
2885 * console. However, the user may modify that default with the
2886 * TIOCL_SETKMSGREDIRECT ioctl call.
2887 *
2888 * This function sets the kernel message console to be @new. It returns the old
2889 * virtual console number. The virtual terminal number 0 (both as parameter and
2890 * return value) means no redirection (i.e. always printed on the currently
2891 * active console).
2892 *
2893 * The parameter -1 means that only the current console is returned, but the
2894 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2895 * case to make the code more understandable.
2896 *
2897 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2898 * the parameter and always returns 0.
2899 */
2900 int vt_kmsg_redirect(int new)
2901 {
2902 static int kmsg_con;
2903
2904 if (new != -1)
2905 return xchg(&kmsg_con, new);
2906 else
2907 return kmsg_con;
2908 }
2909
2910 /*
2911 * Console on virtual terminal
2912 *
2913 * The console must be locked when we get here.
2914 */
2915
2916 static void vt_console_print(struct console *co, const char *b, unsigned count)
2917 {
2918 struct vc_data *vc = vc_cons[fg_console].d;
2919 unsigned char c;
2920 static DEFINE_SPINLOCK(printing_lock);
2921 const ushort *start;
2922 ushort start_x, cnt;
2923 int kmsg_console;
2924
2925 /* console busy or not yet initialized */
2926 if (!printable)
2927 return;
2928 if (!spin_trylock(&printing_lock))
2929 return;
2930
2931 kmsg_console = vt_get_kmsg_redirect();
2932 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2933 vc = vc_cons[kmsg_console - 1].d;
2934
2935 if (!vc_cons_allocated(fg_console)) {
2936 /* impossible */
2937 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2938 goto quit;
2939 }
2940
2941 if (vc->vc_mode != KD_TEXT)
2942 goto quit;
2943
2944 /* undraw cursor first */
2945 if (con_is_fg(vc))
2946 hide_cursor(vc);
2947
2948 start = (ushort *)vc->vc_pos;
2949 start_x = vc->vc_x;
2950 cnt = 0;
2951 while (count--) {
2952 c = *b++;
2953 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2954 if (cnt && con_is_visible(vc))
2955 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2956 cnt = 0;
2957 if (c == 8) { /* backspace */
2958 bs(vc);
2959 start = (ushort *)vc->vc_pos;
2960 start_x = vc->vc_x;
2961 continue;
2962 }
2963 if (c != 13)
2964 lf(vc);
2965 cr(vc);
2966 start = (ushort *)vc->vc_pos;
2967 start_x = vc->vc_x;
2968 if (c == 10 || c == 13)
2969 continue;
2970 }
2971 vc_uniscr_putc(vc, c);
2972 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2973 notify_write(vc, c);
2974 cnt++;
2975 if (vc->vc_x == vc->vc_cols - 1) {
2976 vc->vc_need_wrap = 1;
2977 } else {
2978 vc->vc_pos += 2;
2979 vc->vc_x++;
2980 }
2981 }
2982 if (cnt && con_is_visible(vc))
2983 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2984 set_cursor(vc);
2985 notify_update(vc);
2986
2987 quit:
2988 spin_unlock(&printing_lock);
2989 }
2990
2991 static struct tty_driver *vt_console_device(struct console *c, int *index)
2992 {
2993 *index = c->index ? c->index-1 : fg_console;
2994 return console_driver;
2995 }
2996
2997 static struct console vt_console_driver = {
2998 .name = "tty",
2999 .write = vt_console_print,
3000 .device = vt_console_device,
3001 .unblank = unblank_screen,
3002 .flags = CON_PRINTBUFFER,
3003 .index = -1,
3004 };
3005 #endif
3006
3007 /*
3008 * Handling of Linux-specific VC ioctls
3009 */
3010
3011 /*
3012 * Generally a bit racy with respect to console_lock();.
3013 *
3014 * There are some functions which don't need it.
3015 *
3016 * There are some functions which can sleep for arbitrary periods
3017 * (paste_selection) but we don't need the lock there anyway.
3018 *
3019 * set_selection_user has locking, and definitely needs it
3020 */
3021
3022 int tioclinux(struct tty_struct *tty, unsigned long arg)
3023 {
3024 char type, data;
3025 char __user *p = (char __user *)arg;
3026 int lines;
3027 int ret;
3028
3029 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3030 return -EPERM;
3031 if (get_user(type, p))
3032 return -EFAULT;
3033 ret = 0;
3034
3035 switch (type)
3036 {
3037 case TIOCL_SETSEL:
3038 console_lock();
3039 ret = set_selection_user((struct tiocl_selection
3040 __user *)(p+1), tty);
3041 console_unlock();
3042 break;
3043 case TIOCL_PASTESEL:
3044 ret = paste_selection(tty);
3045 break;
3046 case TIOCL_UNBLANKSCREEN:
3047 console_lock();
3048 unblank_screen();
3049 console_unlock();
3050 break;
3051 case TIOCL_SELLOADLUT:
3052 console_lock();
3053 ret = sel_loadlut(p);
3054 console_unlock();
3055 break;
3056 case TIOCL_GETSHIFTSTATE:
3057
3058 /*
3059 * Make it possible to react to Shift+Mousebutton.
3060 * Note that 'shift_state' is an undocumented
3061 * kernel-internal variable; programs not closely
3062 * related to the kernel should not use this.
3063 */
3064 data = vt_get_shift_state();
3065 ret = put_user(data, p);
3066 break;
3067 case TIOCL_GETMOUSEREPORTING:
3068 console_lock(); /* May be overkill */
3069 data = mouse_reporting();
3070 console_unlock();
3071 ret = put_user(data, p);
3072 break;
3073 case TIOCL_SETVESABLANK:
3074 console_lock();
3075 ret = set_vesa_blanking(p);
3076 console_unlock();
3077 break;
3078 case TIOCL_GETKMSGREDIRECT:
3079 data = vt_get_kmsg_redirect();
3080 ret = put_user(data, p);
3081 break;
3082 case TIOCL_SETKMSGREDIRECT:
3083 if (!capable(CAP_SYS_ADMIN)) {
3084 ret = -EPERM;
3085 } else {
3086 if (get_user(data, p+1))
3087 ret = -EFAULT;
3088 else
3089 vt_kmsg_redirect(data);
3090 }
3091 break;
3092 case TIOCL_GETFGCONSOLE:
3093 /* No locking needed as this is a transiently
3094 correct return anyway if the caller hasn't
3095 disabled switching */
3096 ret = fg_console;
3097 break;
3098 case TIOCL_SCROLLCONSOLE:
3099 if (get_user(lines, (s32 __user *)(p+4))) {
3100 ret = -EFAULT;
3101 } else {
3102 /* Need the console lock here. Note that lots
3103 of other calls need fixing before the lock
3104 is actually useful ! */
3105 console_lock();
3106 scrollfront(vc_cons[fg_console].d, lines);
3107 console_unlock();
3108 ret = 0;
3109 }
3110 break;
3111 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3112 console_lock();
3113 ignore_poke = 1;
3114 do_blank_screen(0);
3115 console_unlock();
3116 break;
3117 case TIOCL_BLANKEDSCREEN:
3118 ret = console_blanked;
3119 break;
3120 default:
3121 ret = -EINVAL;
3122 break;
3123 }
3124 return ret;
3125 }
3126
3127 /*
3128 * /dev/ttyN handling
3129 */
3130
3131 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3132 {
3133 int retval;
3134
3135 retval = do_con_write(tty, buf, count);
3136 con_flush_chars(tty);
3137
3138 return retval;
3139 }
3140
3141 static int con_put_char(struct tty_struct *tty, unsigned char ch)
3142 {
3143 if (in_interrupt())
3144 return 0; /* n_r3964 calls put_char() from interrupt context */
3145 return do_con_write(tty, &ch, 1);
3146 }
3147
3148 static int con_write_room(struct tty_struct *tty)
3149 {
3150 if (tty->stopped)
3151 return 0;
3152 return 32768; /* No limit, really; we're not buffering */
3153 }
3154
3155 static int con_chars_in_buffer(struct tty_struct *tty)
3156 {
3157 return 0; /* we're not buffering */
3158 }
3159
3160 /*
3161 * con_throttle and con_unthrottle are only used for
3162 * paste_selection(), which has to stuff in a large number of
3163 * characters...
3164 */
3165 static void con_throttle(struct tty_struct *tty)
3166 {
3167 }
3168
3169 static void con_unthrottle(struct tty_struct *tty)
3170 {
3171 struct vc_data *vc = tty->driver_data;
3172
3173 wake_up_interruptible(&vc->paste_wait);
3174 }
3175
3176 /*
3177 * Turn the Scroll-Lock LED on when the tty is stopped
3178 */
3179 static void con_stop(struct tty_struct *tty)
3180 {
3181 int console_num;
3182 if (!tty)
3183 return;
3184 console_num = tty->index;
3185 if (!vc_cons_allocated(console_num))
3186 return;
3187 vt_kbd_con_stop(console_num);
3188 }
3189
3190 /*
3191 * Turn the Scroll-Lock LED off when the console is started
3192 */
3193 static void con_start(struct tty_struct *tty)
3194 {
3195 int console_num;
3196 if (!tty)
3197 return;
3198 console_num = tty->index;
3199 if (!vc_cons_allocated(console_num))
3200 return;
3201 vt_kbd_con_start(console_num);
3202 }
3203
3204 static void con_flush_chars(struct tty_struct *tty)
3205 {
3206 struct vc_data *vc;
3207
3208 if (in_interrupt()) /* from flush_to_ldisc */
3209 return;
3210
3211 /* if we race with con_close(), vt may be null */
3212 console_lock();
3213 vc = tty->driver_data;
3214 if (vc)
3215 set_cursor(vc);
3216 console_unlock();
3217 }
3218
3219 /*
3220 * Allocate the console screen memory.
3221 */
3222 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3223 {
3224 unsigned int currcons = tty->index;
3225 struct vc_data *vc;
3226 int ret;
3227
3228 console_lock();
3229 ret = vc_allocate(currcons);
3230 if (ret)
3231 goto unlock;
3232
3233 vc = vc_cons[currcons].d;
3234
3235 /* Still being freed */
3236 if (vc->port.tty) {
3237 ret = -ERESTARTSYS;
3238 goto unlock;
3239 }
3240
3241 ret = tty_port_install(&vc->port, driver, tty);
3242 if (ret)
3243 goto unlock;
3244
3245 tty->driver_data = vc;
3246 vc->port.tty = tty;
3247
3248 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3249 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3250 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3251 }
3252 if (vc->vc_utf)
3253 tty->termios.c_iflag |= IUTF8;
3254 else
3255 tty->termios.c_iflag &= ~IUTF8;
3256 unlock:
3257 console_unlock();
3258 return ret;
3259 }
3260
3261 static int con_open(struct tty_struct *tty, struct file *filp)
3262 {
3263 /* everything done in install */
3264 return 0;
3265 }
3266
3267
3268 static void con_close(struct tty_struct *tty, struct file *filp)
3269 {
3270 /* Nothing to do - we defer to shutdown */
3271 }
3272
3273 static void con_shutdown(struct tty_struct *tty)
3274 {
3275 struct vc_data *vc = tty->driver_data;
3276 BUG_ON(vc == NULL);
3277 console_lock();
3278 vc->port.tty = NULL;
3279 console_unlock();
3280 }
3281
3282 static int default_color = 7; /* white */
3283 static int default_italic_color = 2; // green (ASCII)
3284 static int default_underline_color = 3; // cyan (ASCII)
3285 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3286 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3287 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3288
3289 static void vc_init(struct vc_data *vc, unsigned int rows,
3290 unsigned int cols, int do_clear)
3291 {
3292 int j, k ;
3293
3294 vc->vc_cols = cols;
3295 vc->vc_rows = rows;
3296 vc->vc_size_row = cols << 1;
3297 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3298
3299 set_origin(vc);
3300 vc->vc_pos = vc->vc_origin;
3301 reset_vc(vc);
3302 for (j=k=0; j<16; j++) {
3303 vc->vc_palette[k++] = default_red[j] ;
3304 vc->vc_palette[k++] = default_grn[j] ;
3305 vc->vc_palette[k++] = default_blu[j] ;
3306 }
3307 vc->vc_def_color = default_color;
3308 vc->vc_ulcolor = default_underline_color;
3309 vc->vc_itcolor = default_italic_color;
3310 vc->vc_halfcolor = 0x08; /* grey */
3311 init_waitqueue_head(&vc->paste_wait);
3312 reset_terminal(vc, do_clear);
3313 }
3314
3315 /*
3316 * This routine initializes console interrupts, and does nothing
3317 * else. If you want the screen to clear, call tty_write with
3318 * the appropriate escape-sequence.
3319 */
3320
3321 static int __init con_init(void)
3322 {
3323 const char *display_desc = NULL;
3324 struct vc_data *vc;
3325 unsigned int currcons = 0, i;
3326
3327 console_lock();
3328
3329 if (!conswitchp)
3330 conswitchp = &dummy_con;
3331 display_desc = conswitchp->con_startup();
3332 if (!display_desc) {
3333 fg_console = 0;
3334 console_unlock();
3335 return 0;
3336 }
3337
3338 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3339 struct con_driver *con_driver = &registered_con_driver[i];
3340
3341 if (con_driver->con == NULL) {
3342 con_driver->con = conswitchp;
3343 con_driver->desc = display_desc;
3344 con_driver->flag = CON_DRIVER_FLAG_INIT;
3345 con_driver->first = 0;
3346 con_driver->last = MAX_NR_CONSOLES - 1;
3347 break;
3348 }
3349 }
3350
3351 for (i = 0; i < MAX_NR_CONSOLES; i++)
3352 con_driver_map[i] = conswitchp;
3353
3354 if (blankinterval) {
3355 blank_state = blank_normal_wait;
3356 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3357 }
3358
3359 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3360 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3361 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3362 tty_port_init(&vc->port);
3363 visual_init(vc, currcons, 1);
3364 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3365 vc_init(vc, vc->vc_rows, vc->vc_cols,
3366 currcons || !vc->vc_sw->con_save_screen);
3367 }
3368 currcons = fg_console = 0;
3369 master_display_fg = vc = vc_cons[currcons].d;
3370 set_origin(vc);
3371 save_screen(vc);
3372 gotoxy(vc, vc->vc_x, vc->vc_y);
3373 csi_J(vc, 0);
3374 update_screen(vc);
3375 pr_info("Console: %s %s %dx%d\n",
3376 vc->vc_can_do_color ? "colour" : "mono",
3377 display_desc, vc->vc_cols, vc->vc_rows);
3378 printable = 1;
3379
3380 console_unlock();
3381
3382 #ifdef CONFIG_VT_CONSOLE
3383 register_console(&vt_console_driver);
3384 #endif
3385 return 0;
3386 }
3387 console_initcall(con_init);
3388
3389 static const struct tty_operations con_ops = {
3390 .install = con_install,
3391 .open = con_open,
3392 .close = con_close,
3393 .write = con_write,
3394 .write_room = con_write_room,
3395 .put_char = con_put_char,
3396 .flush_chars = con_flush_chars,
3397 .chars_in_buffer = con_chars_in_buffer,
3398 .ioctl = vt_ioctl,
3399 #ifdef CONFIG_COMPAT
3400 .compat_ioctl = vt_compat_ioctl,
3401 #endif
3402 .stop = con_stop,
3403 .start = con_start,
3404 .throttle = con_throttle,
3405 .unthrottle = con_unthrottle,
3406 .resize = vt_resize,
3407 .shutdown = con_shutdown
3408 };
3409
3410 static struct cdev vc0_cdev;
3411
3412 static ssize_t show_tty_active(struct device *dev,
3413 struct device_attribute *attr, char *buf)
3414 {
3415 return sprintf(buf, "tty%d\n", fg_console + 1);
3416 }
3417 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3418
3419 static struct attribute *vt_dev_attrs[] = {
3420 &dev_attr_active.attr,
3421 NULL
3422 };
3423
3424 ATTRIBUTE_GROUPS(vt_dev);
3425
3426 int __init vty_init(const struct file_operations *console_fops)
3427 {
3428 cdev_init(&vc0_cdev, console_fops);
3429 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3430 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3431 panic("Couldn't register /dev/tty0 driver\n");
3432 tty0dev = device_create_with_groups(tty_class, NULL,
3433 MKDEV(TTY_MAJOR, 0), NULL,
3434 vt_dev_groups, "tty0");
3435 if (IS_ERR(tty0dev))
3436 tty0dev = NULL;
3437
3438 vcs_init();
3439
3440 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3441 if (!console_driver)
3442 panic("Couldn't allocate console driver\n");
3443
3444 console_driver->name = "tty";
3445 console_driver->name_base = 1;
3446 console_driver->major = TTY_MAJOR;
3447 console_driver->minor_start = 1;
3448 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3449 console_driver->init_termios = tty_std_termios;
3450 if (default_utf8)
3451 console_driver->init_termios.c_iflag |= IUTF8;
3452 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3453 tty_set_operations(console_driver, &con_ops);
3454 if (tty_register_driver(console_driver))
3455 panic("Couldn't register console driver\n");
3456 kbd_init();
3457 console_map_init();
3458 #ifdef CONFIG_MDA_CONSOLE
3459 mda_console_init();
3460 #endif
3461 return 0;
3462 }
3463
3464 #ifndef VT_SINGLE_DRIVER
3465
3466 static struct class *vtconsole_class;
3467
3468 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3469 int deflt)
3470 {
3471 struct module *owner = csw->owner;
3472 const char *desc = NULL;
3473 struct con_driver *con_driver;
3474 int i, j = -1, k = -1, retval = -ENODEV;
3475
3476 if (!try_module_get(owner))
3477 return -ENODEV;
3478
3479 WARN_CONSOLE_UNLOCKED();
3480
3481 /* check if driver is registered */
3482 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3483 con_driver = &registered_con_driver[i];
3484
3485 if (con_driver->con == csw) {
3486 desc = con_driver->desc;
3487 retval = 0;
3488 break;
3489 }
3490 }
3491
3492 if (retval)
3493 goto err;
3494
3495 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3496 csw->con_startup();
3497 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3498 }
3499
3500 if (deflt) {
3501 if (conswitchp)
3502 module_put(conswitchp->owner);
3503
3504 __module_get(owner);
3505 conswitchp = csw;
3506 }
3507
3508 first = max(first, con_driver->first);
3509 last = min(last, con_driver->last);
3510
3511 for (i = first; i <= last; i++) {
3512 int old_was_color;
3513 struct vc_data *vc = vc_cons[i].d;
3514
3515 if (con_driver_map[i])
3516 module_put(con_driver_map[i]->owner);
3517 __module_get(owner);
3518 con_driver_map[i] = csw;
3519
3520 if (!vc || !vc->vc_sw)
3521 continue;
3522
3523 j = i;
3524
3525 if (con_is_visible(vc)) {
3526 k = i;
3527 save_screen(vc);
3528 }
3529
3530 old_was_color = vc->vc_can_do_color;
3531 vc->vc_sw->con_deinit(vc);
3532 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3533 visual_init(vc, i, 0);
3534 set_origin(vc);
3535 update_attr(vc);
3536
3537 /* If the console changed between mono <-> color, then
3538 * the attributes in the screenbuf will be wrong. The
3539 * following resets all attributes to something sane.
3540 */
3541 if (old_was_color != vc->vc_can_do_color)
3542 clear_buffer_attributes(vc);
3543 }
3544
3545 pr_info("Console: switching ");
3546 if (!deflt)
3547 pr_cont("consoles %d-%d ", first + 1, last + 1);
3548 if (j >= 0) {
3549 struct vc_data *vc = vc_cons[j].d;
3550
3551 pr_cont("to %s %s %dx%d\n",
3552 vc->vc_can_do_color ? "colour" : "mono",
3553 desc, vc->vc_cols, vc->vc_rows);
3554
3555 if (k >= 0) {
3556 vc = vc_cons[k].d;
3557 update_screen(vc);
3558 }
3559 } else {
3560 pr_cont("to %s\n", desc);
3561 }
3562
3563 retval = 0;
3564 err:
3565 module_put(owner);
3566 return retval;
3567 };
3568
3569
3570 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3571 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3572 {
3573 struct module *owner = csw->owner;
3574 const struct consw *defcsw = NULL;
3575 struct con_driver *con_driver = NULL, *con_back = NULL;
3576 int i, retval = -ENODEV;
3577
3578 if (!try_module_get(owner))
3579 return -ENODEV;
3580
3581 WARN_CONSOLE_UNLOCKED();
3582
3583 /* check if driver is registered and if it is unbindable */
3584 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3585 con_driver = &registered_con_driver[i];
3586
3587 if (con_driver->con == csw &&
3588 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3589 retval = 0;
3590 break;
3591 }
3592 }
3593
3594 if (retval)
3595 goto err;
3596
3597 retval = -ENODEV;
3598
3599 /* check if backup driver exists */
3600 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3601 con_back = &registered_con_driver[i];
3602
3603 if (con_back->con && con_back->con != csw) {
3604 defcsw = con_back->con;
3605 retval = 0;
3606 break;
3607 }
3608 }
3609
3610 if (retval)
3611 goto err;
3612
3613 if (!con_is_bound(csw))
3614 goto err;
3615
3616 first = max(first, con_driver->first);
3617 last = min(last, con_driver->last);
3618
3619 for (i = first; i <= last; i++) {
3620 if (con_driver_map[i] == csw) {
3621 module_put(csw->owner);
3622 con_driver_map[i] = NULL;
3623 }
3624 }
3625
3626 if (!con_is_bound(defcsw)) {
3627 const struct consw *defconsw = conswitchp;
3628
3629 defcsw->con_startup();
3630 con_back->flag |= CON_DRIVER_FLAG_INIT;
3631 /*
3632 * vgacon may change the default driver to point
3633 * to dummycon, we restore it here...
3634 */
3635 conswitchp = defconsw;
3636 }
3637
3638 if (!con_is_bound(csw))
3639 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3640
3641 /* ignore return value, binding should not fail */
3642 do_bind_con_driver(defcsw, first, last, deflt);
3643 err:
3644 module_put(owner);
3645 return retval;
3646
3647 }
3648 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3649
3650 static int vt_bind(struct con_driver *con)
3651 {
3652 const struct consw *defcsw = NULL, *csw = NULL;
3653 int i, more = 1, first = -1, last = -1, deflt = 0;
3654
3655 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3656 goto err;
3657
3658 csw = con->con;
3659
3660 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3661 struct con_driver *con = &registered_con_driver[i];
3662
3663 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3664 defcsw = con->con;
3665 break;
3666 }
3667 }
3668
3669 if (!defcsw)
3670 goto err;
3671
3672 while (more) {
3673 more = 0;
3674
3675 for (i = con->first; i <= con->last; i++) {
3676 if (con_driver_map[i] == defcsw) {
3677 if (first == -1)
3678 first = i;
3679 last = i;
3680 more = 1;
3681 } else if (first != -1)
3682 break;
3683 }
3684
3685 if (first == 0 && last == MAX_NR_CONSOLES -1)
3686 deflt = 1;
3687
3688 if (first != -1)
3689 do_bind_con_driver(csw, first, last, deflt);
3690
3691 first = -1;
3692 last = -1;
3693 deflt = 0;
3694 }
3695
3696 err:
3697 return 0;
3698 }
3699
3700 static int vt_unbind(struct con_driver *con)
3701 {
3702 const struct consw *csw = NULL;
3703 int i, more = 1, first = -1, last = -1, deflt = 0;
3704 int ret;
3705
3706 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3707 goto err;
3708
3709 csw = con->con;
3710
3711 while (more) {
3712 more = 0;
3713
3714 for (i = con->first; i <= con->last; i++) {
3715 if (con_driver_map[i] == csw) {
3716 if (first == -1)
3717 first = i;
3718 last = i;
3719 more = 1;
3720 } else if (first != -1)
3721 break;
3722 }
3723
3724 if (first == 0 && last == MAX_NR_CONSOLES -1)
3725 deflt = 1;
3726
3727 if (first != -1) {
3728 ret = do_unbind_con_driver(csw, first, last, deflt);
3729 if (ret != 0)
3730 return ret;
3731 }
3732
3733 first = -1;
3734 last = -1;
3735 deflt = 0;
3736 }
3737
3738 err:
3739 return 0;
3740 }
3741 #else
3742 static inline int vt_bind(struct con_driver *con)
3743 {
3744 return 0;
3745 }
3746 static inline int vt_unbind(struct con_driver *con)
3747 {
3748 return 0;
3749 }
3750 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3751
3752 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3753 const char *buf, size_t count)
3754 {
3755 struct con_driver *con = dev_get_drvdata(dev);
3756 int bind = simple_strtoul(buf, NULL, 0);
3757
3758 console_lock();
3759
3760 if (bind)
3761 vt_bind(con);
3762 else
3763 vt_unbind(con);
3764
3765 console_unlock();
3766
3767 return count;
3768 }
3769
3770 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3771 char *buf)
3772 {
3773 struct con_driver *con = dev_get_drvdata(dev);
3774 int bind;
3775
3776 console_lock();
3777 bind = con_is_bound(con->con);
3778 console_unlock();
3779
3780 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3781 }
3782
3783 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3784 char *buf)
3785 {
3786 struct con_driver *con = dev_get_drvdata(dev);
3787
3788 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3789 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3790 con->desc);
3791
3792 }
3793
3794 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3795 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3796
3797 static struct attribute *con_dev_attrs[] = {
3798 &dev_attr_bind.attr,
3799 &dev_attr_name.attr,
3800 NULL
3801 };
3802
3803 ATTRIBUTE_GROUPS(con_dev);
3804
3805 static int vtconsole_init_device(struct con_driver *con)
3806 {
3807 con->flag |= CON_DRIVER_FLAG_ATTR;
3808 return 0;
3809 }
3810
3811 static void vtconsole_deinit_device(struct con_driver *con)
3812 {
3813 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3814 }
3815
3816 /**
3817 * con_is_bound - checks if driver is bound to the console
3818 * @csw: console driver
3819 *
3820 * RETURNS: zero if unbound, nonzero if bound
3821 *
3822 * Drivers can call this and if zero, they should release
3823 * all resources allocated on con_startup()
3824 */
3825 int con_is_bound(const struct consw *csw)
3826 {
3827 int i, bound = 0;
3828
3829 WARN_CONSOLE_UNLOCKED();
3830
3831 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3832 if (con_driver_map[i] == csw) {
3833 bound = 1;
3834 break;
3835 }
3836 }
3837
3838 return bound;
3839 }
3840 EXPORT_SYMBOL(con_is_bound);
3841
3842 /**
3843 * con_is_visible - checks whether the current console is visible
3844 * @vc: virtual console
3845 *
3846 * RETURNS: zero if not visible, nonzero if visible
3847 */
3848 bool con_is_visible(const struct vc_data *vc)
3849 {
3850 WARN_CONSOLE_UNLOCKED();
3851
3852 return *vc->vc_display_fg == vc;
3853 }
3854 EXPORT_SYMBOL(con_is_visible);
3855
3856 /**
3857 * con_debug_enter - prepare the console for the kernel debugger
3858 * @sw: console driver
3859 *
3860 * Called when the console is taken over by the kernel debugger, this
3861 * function needs to save the current console state, then put the console
3862 * into a state suitable for the kernel debugger.
3863 *
3864 * RETURNS:
3865 * Zero on success, nonzero if a failure occurred when trying to prepare
3866 * the console for the debugger.
3867 */
3868 int con_debug_enter(struct vc_data *vc)
3869 {
3870 int ret = 0;
3871
3872 saved_fg_console = fg_console;
3873 saved_last_console = last_console;
3874 saved_want_console = want_console;
3875 saved_vc_mode = vc->vc_mode;
3876 saved_console_blanked = console_blanked;
3877 vc->vc_mode = KD_TEXT;
3878 console_blanked = 0;
3879 if (vc->vc_sw->con_debug_enter)
3880 ret = vc->vc_sw->con_debug_enter(vc);
3881 #ifdef CONFIG_KGDB_KDB
3882 /* Set the initial LINES variable if it is not already set */
3883 if (vc->vc_rows < 999) {
3884 int linecount;
3885 char lns[4];
3886 const char *setargs[3] = {
3887 "set",
3888 "LINES",
3889 lns,
3890 };
3891 if (kdbgetintenv(setargs[0], &linecount)) {
3892 snprintf(lns, 4, "%i", vc->vc_rows);
3893 kdb_set(2, setargs);
3894 }
3895 }
3896 if (vc->vc_cols < 999) {
3897 int colcount;
3898 char cols[4];
3899 const char *setargs[3] = {
3900 "set",
3901 "COLUMNS",
3902 cols,
3903 };
3904 if (kdbgetintenv(setargs[0], &colcount)) {
3905 snprintf(cols, 4, "%i", vc->vc_cols);
3906 kdb_set(2, setargs);
3907 }
3908 }
3909 #endif /* CONFIG_KGDB_KDB */
3910 return ret;
3911 }
3912 EXPORT_SYMBOL_GPL(con_debug_enter);
3913
3914 /**
3915 * con_debug_leave - restore console state
3916 * @sw: console driver
3917 *
3918 * Restore the console state to what it was before the kernel debugger
3919 * was invoked.
3920 *
3921 * RETURNS:
3922 * Zero on success, nonzero if a failure occurred when trying to restore
3923 * the console.
3924 */
3925 int con_debug_leave(void)
3926 {
3927 struct vc_data *vc;
3928 int ret = 0;
3929
3930 fg_console = saved_fg_console;
3931 last_console = saved_last_console;
3932 want_console = saved_want_console;
3933 console_blanked = saved_console_blanked;
3934 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3935
3936 vc = vc_cons[fg_console].d;
3937 if (vc->vc_sw->con_debug_leave)
3938 ret = vc->vc_sw->con_debug_leave(vc);
3939 return ret;
3940 }
3941 EXPORT_SYMBOL_GPL(con_debug_leave);
3942
3943 static int do_register_con_driver(const struct consw *csw, int first, int last)
3944 {
3945 struct module *owner = csw->owner;
3946 struct con_driver *con_driver;
3947 const char *desc;
3948 int i, retval;
3949
3950 WARN_CONSOLE_UNLOCKED();
3951
3952 if (!try_module_get(owner))
3953 return -ENODEV;
3954
3955 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3956 con_driver = &registered_con_driver[i];
3957
3958 /* already registered */
3959 if (con_driver->con == csw) {
3960 retval = -EBUSY;
3961 goto err;
3962 }
3963 }
3964
3965 desc = csw->con_startup();
3966 if (!desc) {
3967 retval = -ENODEV;
3968 goto err;
3969 }
3970
3971 retval = -EINVAL;
3972
3973 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3974 con_driver = &registered_con_driver[i];
3975
3976 if (con_driver->con == NULL &&
3977 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3978 con_driver->con = csw;
3979 con_driver->desc = desc;
3980 con_driver->node = i;
3981 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3982 CON_DRIVER_FLAG_INIT;
3983 con_driver->first = first;
3984 con_driver->last = last;
3985 retval = 0;
3986 break;
3987 }
3988 }
3989
3990 if (retval)
3991 goto err;
3992
3993 con_driver->dev =
3994 device_create_with_groups(vtconsole_class, NULL,
3995 MKDEV(0, con_driver->node),
3996 con_driver, con_dev_groups,
3997 "vtcon%i", con_driver->node);
3998 if (IS_ERR(con_driver->dev)) {
3999 pr_warn("Unable to create device for %s; errno = %ld\n",
4000 con_driver->desc, PTR_ERR(con_driver->dev));
4001 con_driver->dev = NULL;
4002 } else {
4003 vtconsole_init_device(con_driver);
4004 }
4005
4006 err:
4007 module_put(owner);
4008 return retval;
4009 }
4010
4011
4012 /**
4013 * do_unregister_con_driver - unregister console driver from console layer
4014 * @csw: console driver
4015 *
4016 * DESCRIPTION: All drivers that registers to the console layer must
4017 * call this function upon exit, or if the console driver is in a state
4018 * where it won't be able to handle console services, such as the
4019 * framebuffer console without loaded framebuffer drivers.
4020 *
4021 * The driver must unbind first prior to unregistration.
4022 */
4023 int do_unregister_con_driver(const struct consw *csw)
4024 {
4025 int i;
4026
4027 /* cannot unregister a bound driver */
4028 if (con_is_bound(csw))
4029 return -EBUSY;
4030
4031 if (csw == conswitchp)
4032 return -EINVAL;
4033
4034 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4035 struct con_driver *con_driver = &registered_con_driver[i];
4036
4037 if (con_driver->con == csw) {
4038 /*
4039 * Defer the removal of the sysfs entries since that
4040 * will acquire the kernfs s_active lock and we can't
4041 * acquire this lock while holding the console lock:
4042 * the unbind sysfs entry imposes already the opposite
4043 * order. Reset con already here to prevent any later
4044 * lookup to succeed and mark this slot as zombie, so
4045 * it won't get reused until we complete the removal
4046 * in the deferred work.
4047 */
4048 con_driver->con = NULL;
4049 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4050 schedule_work(&con_driver_unregister_work);
4051
4052 return 0;
4053 }
4054 }
4055
4056 return -ENODEV;
4057 }
4058 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4059
4060 static void con_driver_unregister_callback(struct work_struct *ignored)
4061 {
4062 int i;
4063
4064 console_lock();
4065
4066 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4067 struct con_driver *con_driver = &registered_con_driver[i];
4068
4069 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4070 continue;
4071
4072 console_unlock();
4073
4074 vtconsole_deinit_device(con_driver);
4075 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4076
4077 console_lock();
4078
4079 if (WARN_ON_ONCE(con_driver->con))
4080 con_driver->con = NULL;
4081 con_driver->desc = NULL;
4082 con_driver->dev = NULL;
4083 con_driver->node = 0;
4084 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4085 con_driver->flag = 0;
4086 con_driver->first = 0;
4087 con_driver->last = 0;
4088 }
4089
4090 console_unlock();
4091 }
4092
4093 /*
4094 * If we support more console drivers, this function is used
4095 * when a driver wants to take over some existing consoles
4096 * and become default driver for newly opened ones.
4097 *
4098 * do_take_over_console is basically a register followed by bind
4099 */
4100 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4101 {
4102 int err;
4103
4104 err = do_register_con_driver(csw, first, last);
4105 /*
4106 * If we get an busy error we still want to bind the console driver
4107 * and return success, as we may have unbound the console driver
4108 * but not unregistered it.
4109 */
4110 if (err == -EBUSY)
4111 err = 0;
4112 if (!err)
4113 do_bind_con_driver(csw, first, last, deflt);
4114
4115 return err;
4116 }
4117 EXPORT_SYMBOL_GPL(do_take_over_console);
4118
4119
4120 /*
4121 * give_up_console is a wrapper to unregister_con_driver. It will only
4122 * work if driver is fully unbound.
4123 */
4124 void give_up_console(const struct consw *csw)
4125 {
4126 console_lock();
4127 do_unregister_con_driver(csw);
4128 console_unlock();
4129 }
4130
4131 static int __init vtconsole_class_init(void)
4132 {
4133 int i;
4134
4135 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4136 if (IS_ERR(vtconsole_class)) {
4137 pr_warn("Unable to create vt console class; errno = %ld\n",
4138 PTR_ERR(vtconsole_class));
4139 vtconsole_class = NULL;
4140 }
4141
4142 /* Add system drivers to sysfs */
4143 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4144 struct con_driver *con = &registered_con_driver[i];
4145
4146 if (con->con && !con->dev) {
4147 con->dev =
4148 device_create_with_groups(vtconsole_class, NULL,
4149 MKDEV(0, con->node),
4150 con, con_dev_groups,
4151 "vtcon%i", con->node);
4152
4153 if (IS_ERR(con->dev)) {
4154 pr_warn("Unable to create device for %s; errno = %ld\n",
4155 con->desc, PTR_ERR(con->dev));
4156 con->dev = NULL;
4157 } else {
4158 vtconsole_init_device(con);
4159 }
4160 }
4161 }
4162
4163 return 0;
4164 }
4165 postcore_initcall(vtconsole_class_init);
4166
4167 #endif
4168
4169 /*
4170 * Screen blanking
4171 */
4172
4173 static int set_vesa_blanking(char __user *p)
4174 {
4175 unsigned int mode;
4176
4177 if (get_user(mode, p + 1))
4178 return -EFAULT;
4179
4180 vesa_blank_mode = (mode < 4) ? mode : 0;
4181 return 0;
4182 }
4183
4184 void do_blank_screen(int entering_gfx)
4185 {
4186 struct vc_data *vc = vc_cons[fg_console].d;
4187 int i;
4188
4189 might_sleep();
4190
4191 WARN_CONSOLE_UNLOCKED();
4192
4193 if (console_blanked) {
4194 if (blank_state == blank_vesa_wait) {
4195 blank_state = blank_off;
4196 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4197 }
4198 return;
4199 }
4200
4201 /* entering graphics mode? */
4202 if (entering_gfx) {
4203 hide_cursor(vc);
4204 save_screen(vc);
4205 vc->vc_sw->con_blank(vc, -1, 1);
4206 console_blanked = fg_console + 1;
4207 blank_state = blank_off;
4208 set_origin(vc);
4209 return;
4210 }
4211
4212 blank_state = blank_off;
4213
4214 /* don't blank graphics */
4215 if (vc->vc_mode != KD_TEXT) {
4216 console_blanked = fg_console + 1;
4217 return;
4218 }
4219
4220 hide_cursor(vc);
4221 del_timer_sync(&console_timer);
4222 blank_timer_expired = 0;
4223
4224 save_screen(vc);
4225 /* In case we need to reset origin, blanking hook returns 1 */
4226 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4227 console_blanked = fg_console + 1;
4228 if (i)
4229 set_origin(vc);
4230
4231 if (console_blank_hook && console_blank_hook(1))
4232 return;
4233
4234 if (vesa_off_interval && vesa_blank_mode) {
4235 blank_state = blank_vesa_wait;
4236 mod_timer(&console_timer, jiffies + vesa_off_interval);
4237 }
4238 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4239 }
4240 EXPORT_SYMBOL(do_blank_screen);
4241
4242 /*
4243 * Called by timer as well as from vt_console_driver
4244 */
4245 void do_unblank_screen(int leaving_gfx)
4246 {
4247 struct vc_data *vc;
4248
4249 /* This should now always be called from a "sane" (read: can schedule)
4250 * context for the sake of the low level drivers, except in the special
4251 * case of oops_in_progress
4252 */
4253 if (!oops_in_progress)
4254 might_sleep();
4255
4256 WARN_CONSOLE_UNLOCKED();
4257
4258 ignore_poke = 0;
4259 if (!console_blanked)
4260 return;
4261 if (!vc_cons_allocated(fg_console)) {
4262 /* impossible */
4263 pr_warn("unblank_screen: tty %d not allocated ??\n",
4264 fg_console + 1);
4265 return;
4266 }
4267 vc = vc_cons[fg_console].d;
4268 if (vc->vc_mode != KD_TEXT)
4269 return; /* but leave console_blanked != 0 */
4270
4271 if (blankinterval) {
4272 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4273 blank_state = blank_normal_wait;
4274 }
4275
4276 console_blanked = 0;
4277 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4278 /* Low-level driver cannot restore -> do it ourselves */
4279 update_screen(vc);
4280 if (console_blank_hook)
4281 console_blank_hook(0);
4282 set_palette(vc);
4283 set_cursor(vc);
4284 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4285 }
4286 EXPORT_SYMBOL(do_unblank_screen);
4287
4288 /*
4289 * This is called by the outside world to cause a forced unblank, mostly for
4290 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4291 * call it with 1 as an argument and so force a mode restore... that may kill
4292 * X or at least garbage the screen but would also make the Oops visible...
4293 */
4294 void unblank_screen(void)
4295 {
4296 do_unblank_screen(0);
4297 }
4298
4299 /*
4300 * We defer the timer blanking to work queue so it can take the console mutex
4301 * (console operations can still happen at irq time, but only from printk which
4302 * has the console mutex. Not perfect yet, but better than no locking
4303 */
4304 static void blank_screen_t(struct timer_list *unused)
4305 {
4306 blank_timer_expired = 1;
4307 schedule_work(&console_work);
4308 }
4309
4310 void poke_blanked_console(void)
4311 {
4312 WARN_CONSOLE_UNLOCKED();
4313
4314 /* Add this so we quickly catch whoever might call us in a non
4315 * safe context. Nowadays, unblank_screen() isn't to be called in
4316 * atomic contexts and is allowed to schedule (with the special case
4317 * of oops_in_progress, but that isn't of any concern for this
4318 * function. --BenH.
4319 */
4320 might_sleep();
4321
4322 /* This isn't perfectly race free, but a race here would be mostly harmless,
4323 * at worse, we'll do a spurrious blank and it's unlikely
4324 */
4325 del_timer(&console_timer);
4326 blank_timer_expired = 0;
4327
4328 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4329 return;
4330 if (console_blanked)
4331 unblank_screen();
4332 else if (blankinterval) {
4333 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4334 blank_state = blank_normal_wait;
4335 }
4336 }
4337
4338 /*
4339 * Palettes
4340 */
4341
4342 static void set_palette(struct vc_data *vc)
4343 {
4344 WARN_CONSOLE_UNLOCKED();
4345
4346 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4347 vc->vc_sw->con_set_palette(vc, color_table);
4348 }
4349
4350 /*
4351 * Load palette into the DAC registers. arg points to a colour
4352 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4353 */
4354
4355 int con_set_cmap(unsigned char __user *arg)
4356 {
4357 int i, j, k;
4358 unsigned char colormap[3*16];
4359
4360 if (copy_from_user(colormap, arg, sizeof(colormap)))
4361 return -EFAULT;
4362
4363 console_lock();
4364 for (i = k = 0; i < 16; i++) {
4365 default_red[i] = colormap[k++];
4366 default_grn[i] = colormap[k++];
4367 default_blu[i] = colormap[k++];
4368 }
4369 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4370 if (!vc_cons_allocated(i))
4371 continue;
4372 for (j = k = 0; j < 16; j++) {
4373 vc_cons[i].d->vc_palette[k++] = default_red[j];
4374 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4375 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4376 }
4377 set_palette(vc_cons[i].d);
4378 }
4379 console_unlock();
4380
4381 return 0;
4382 }
4383
4384 int con_get_cmap(unsigned char __user *arg)
4385 {
4386 int i, k;
4387 unsigned char colormap[3*16];
4388
4389 console_lock();
4390 for (i = k = 0; i < 16; i++) {
4391 colormap[k++] = default_red[i];
4392 colormap[k++] = default_grn[i];
4393 colormap[k++] = default_blu[i];
4394 }
4395 console_unlock();
4396
4397 if (copy_to_user(arg, colormap, sizeof(colormap)))
4398 return -EFAULT;
4399
4400 return 0;
4401 }
4402
4403 void reset_palette(struct vc_data *vc)
4404 {
4405 int j, k;
4406 for (j=k=0; j<16; j++) {
4407 vc->vc_palette[k++] = default_red[j];
4408 vc->vc_palette[k++] = default_grn[j];
4409 vc->vc_palette[k++] = default_blu[j];
4410 }
4411 set_palette(vc);
4412 }
4413
4414 /*
4415 * Font switching
4416 *
4417 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4418 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4419 * depending on width) reserved for each character which is kinda wasty, but
4420 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4421 * is up to the actual low-level console-driver convert data into its favorite
4422 * format (maybe we should add a `fontoffset' field to the `display'
4423 * structure so we won't have to convert the fontdata all the time.
4424 * /Jes
4425 */
4426
4427 #define max_font_size 65536
4428
4429 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4430 {
4431 struct console_font font;
4432 int rc = -EINVAL;
4433 int c;
4434
4435 if (op->data) {
4436 font.data = kmalloc(max_font_size, GFP_KERNEL);
4437 if (!font.data)
4438 return -ENOMEM;
4439 } else
4440 font.data = NULL;
4441
4442 console_lock();
4443 if (vc->vc_mode != KD_TEXT)
4444 rc = -EINVAL;
4445 else if (vc->vc_sw->con_font_get)
4446 rc = vc->vc_sw->con_font_get(vc, &font);
4447 else
4448 rc = -ENOSYS;
4449 console_unlock();
4450
4451 if (rc)
4452 goto out;
4453
4454 c = (font.width+7)/8 * 32 * font.charcount;
4455
4456 if (op->data && font.charcount > op->charcount)
4457 rc = -ENOSPC;
4458 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4459 if (font.width > op->width || font.height > op->height)
4460 rc = -ENOSPC;
4461 } else {
4462 if (font.width != 8)
4463 rc = -EIO;
4464 else if ((op->height && font.height > op->height) ||
4465 font.height > 32)
4466 rc = -ENOSPC;
4467 }
4468 if (rc)
4469 goto out;
4470
4471 op->height = font.height;
4472 op->width = font.width;
4473 op->charcount = font.charcount;
4474
4475 if (op->data && copy_to_user(op->data, font.data, c))
4476 rc = -EFAULT;
4477
4478 out:
4479 kfree(font.data);
4480 return rc;
4481 }
4482
4483 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4484 {
4485 struct console_font font;
4486 int rc = -EINVAL;
4487 int size;
4488
4489 if (vc->vc_mode != KD_TEXT)
4490 return -EINVAL;
4491 if (!op->data)
4492 return -EINVAL;
4493 if (op->charcount > 512)
4494 return -EINVAL;
4495 if (op->width <= 0 || op->width > 32 || op->height > 32)
4496 return -EINVAL;
4497 size = (op->width+7)/8 * 32 * op->charcount;
4498 if (size > max_font_size)
4499 return -ENOSPC;
4500
4501 font.data = memdup_user(op->data, size);
4502 if (IS_ERR(font.data))
4503 return PTR_ERR(font.data);
4504
4505 if (!op->height) { /* Need to guess font height [compat] */
4506 int h, i;
4507 u8 *charmap = font.data;
4508
4509 /*
4510 * If from KDFONTOP ioctl, don't allow things which can be done
4511 * in userland,so that we can get rid of this soon
4512 */
4513 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4514 kfree(font.data);
4515 return -EINVAL;
4516 }
4517
4518 for (h = 32; h > 0; h--)
4519 for (i = 0; i < op->charcount; i++)
4520 if (charmap[32*i+h-1])
4521 goto nonzero;
4522
4523 kfree(font.data);
4524 return -EINVAL;
4525
4526 nonzero:
4527 op->height = h;
4528 }
4529
4530 font.charcount = op->charcount;
4531 font.width = op->width;
4532 font.height = op->height;
4533
4534 console_lock();
4535 if (vc->vc_mode != KD_TEXT)
4536 rc = -EINVAL;
4537 else if (vc->vc_sw->con_font_set)
4538 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4539 else
4540 rc = -ENOSYS;
4541 console_unlock();
4542 kfree(font.data);
4543 return rc;
4544 }
4545
4546 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4547 {
4548 struct console_font font = {.width = op->width, .height = op->height};
4549 char name[MAX_FONT_NAME];
4550 char *s = name;
4551 int rc;
4552
4553
4554 if (!op->data)
4555 s = NULL;
4556 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4557 return -EFAULT;
4558 else
4559 name[MAX_FONT_NAME - 1] = 0;
4560
4561 console_lock();
4562 if (vc->vc_mode != KD_TEXT) {
4563 console_unlock();
4564 return -EINVAL;
4565 }
4566 if (vc->vc_sw->con_font_default)
4567 rc = vc->vc_sw->con_font_default(vc, &font, s);
4568 else
4569 rc = -ENOSYS;
4570 console_unlock();
4571 if (!rc) {
4572 op->width = font.width;
4573 op->height = font.height;
4574 }
4575 return rc;
4576 }
4577
4578 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4579 {
4580 int con = op->height;
4581 int rc;
4582
4583
4584 console_lock();
4585 if (vc->vc_mode != KD_TEXT)
4586 rc = -EINVAL;
4587 else if (!vc->vc_sw->con_font_copy)
4588 rc = -ENOSYS;
4589 else if (con < 0 || !vc_cons_allocated(con))
4590 rc = -ENOTTY;
4591 else if (con == vc->vc_num) /* nothing to do */
4592 rc = 0;
4593 else
4594 rc = vc->vc_sw->con_font_copy(vc, con);
4595 console_unlock();
4596 return rc;
4597 }
4598
4599 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4600 {
4601 switch (op->op) {
4602 case KD_FONT_OP_SET:
4603 return con_font_set(vc, op);
4604 case KD_FONT_OP_GET:
4605 return con_font_get(vc, op);
4606 case KD_FONT_OP_SET_DEFAULT:
4607 return con_font_default(vc, op);
4608 case KD_FONT_OP_COPY:
4609 return con_font_copy(vc, op);
4610 }
4611 return -ENOSYS;
4612 }
4613
4614 /*
4615 * Interface exported to selection and vcs.
4616 */
4617
4618 /* used by selection */
4619 u16 screen_glyph(struct vc_data *vc, int offset)
4620 {
4621 u16 w = scr_readw(screenpos(vc, offset, 1));
4622 u16 c = w & 0xff;
4623
4624 if (w & vc->vc_hi_font_mask)
4625 c |= 0x100;
4626 return c;
4627 }
4628 EXPORT_SYMBOL_GPL(screen_glyph);
4629
4630 u32 screen_glyph_unicode(struct vc_data *vc, int n)
4631 {
4632 struct uni_screen *uniscr = get_vc_uniscr(vc);
4633
4634 if (uniscr)
4635 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4636 return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4637 }
4638 EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4639
4640 /* used by vcs - note the word offset */
4641 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4642 {
4643 return screenpos(vc, 2 * w_offset, viewed);
4644 }
4645 EXPORT_SYMBOL_GPL(screen_pos);
4646
4647 void getconsxy(struct vc_data *vc, unsigned char *p)
4648 {
4649 /* clamp values if they don't fit */
4650 p[0] = min(vc->vc_x, 0xFFu);
4651 p[1] = min(vc->vc_y, 0xFFu);
4652 }
4653
4654 void putconsxy(struct vc_data *vc, unsigned char *p)
4655 {
4656 hide_cursor(vc);
4657 gotoxy(vc, p[0], p[1]);
4658 set_cursor(vc);
4659 }
4660
4661 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4662 {
4663 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4664 return softcursor_original;
4665 return scr_readw(org);
4666 }
4667
4668 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4669 {
4670 scr_writew(val, org);
4671 if ((unsigned long)org == vc->vc_pos) {
4672 softcursor_original = -1;
4673 add_softcursor(vc);
4674 }
4675 }
4676
4677 void vcs_scr_updated(struct vc_data *vc)
4678 {
4679 notify_update(vc);
4680 }
4681
4682 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4683 unsigned int rolled_over, void *base, unsigned int size)
4684 {
4685 unsigned long ubase = (unsigned long)base;
4686 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4687 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4688 ptrdiff_t origin = (void *)c->vc_origin - base;
4689 int margin = c->vc_size_row * 4;
4690 int from, wrap, from_off, avail;
4691
4692 /* Turn scrollback off */
4693 if (!lines) {
4694 c->vc_visible_origin = c->vc_origin;
4695 return;
4696 }
4697
4698 /* Do we have already enough to allow jumping from 0 to the end? */
4699 if (rolled_over > scr_end + margin) {
4700 from = scr_end;
4701 wrap = rolled_over + c->vc_size_row;
4702 } else {
4703 from = 0;
4704 wrap = size;
4705 }
4706
4707 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4708 avail = (origin - from + wrap) % wrap;
4709
4710 /* Only a little piece would be left? Show all incl. the piece! */
4711 if (avail < 2 * margin)
4712 margin = 0;
4713 if (from_off < margin)
4714 from_off = 0;
4715 if (from_off > avail - margin)
4716 from_off = avail;
4717
4718 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4719 }
4720 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4721
4722 /*
4723 * Visible symbols for modules
4724 */
4725
4726 EXPORT_SYMBOL(color_table);
4727 EXPORT_SYMBOL(default_red);
4728 EXPORT_SYMBOL(default_grn);
4729 EXPORT_SYMBOL(default_blu);
4730 EXPORT_SYMBOL(update_region);
4731 EXPORT_SYMBOL(redraw_screen);
4732 EXPORT_SYMBOL(vc_resize);
4733 EXPORT_SYMBOL(fg_console);
4734 EXPORT_SYMBOL(console_blank_hook);
4735 EXPORT_SYMBOL(console_blanked);
4736 EXPORT_SYMBOL(vc_cons);
4737 EXPORT_SYMBOL(global_cursor_default);
4738 #ifndef VT_SINGLE_DRIVER
4739 EXPORT_SYMBOL(give_up_console);
4740 #endif
Linux with added FPC-III support