?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Revert "tty: hvc: Fix data abort due to race in hvc_open"
[linux/fpc-iii.git] / drivers / tty / vt / vt.c
blob48a8199f7845dff3d4cefd892db27257962d18a6
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6 /*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
61 * deletion SMP-safe. 17Jun00, Andrew Morton
62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72 */
73
74 #include <linux/module.h>
75 #include <linux/types.h>
76 #include <linux/sched/signal.h>
77 #include <linux/tty.h>
78 #include <linux/tty_flip.h>
79 #include <linux/kernel.h>
80 #include <linux/string.h>
81 #include <linux/errno.h>
82 #include <linux/kd.h>
83 #include <linux/slab.h>
84 #include <linux/vmalloc.h>
85 #include <linux/major.h>
86 #include <linux/mm.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/mutex.h>
90 #include <linux/vt_kern.h>
91 #include <linux/selection.h>
92 #include <linux/tiocl.h>
93 #include <linux/kbd_kern.h>
94 #include <linux/consolemap.h>
95 #include <linux/timer.h>
96 #include <linux/interrupt.h>
97 #include <linux/workqueue.h>
98 #include <linux/pm.h>
99 #include <linux/font.h>
100 #include <linux/bitops.h>
101 #include <linux/notifier.h>
102 #include <linux/device.h>
103 #include <linux/io.h>
104 #include <linux/uaccess.h>
105 #include <linux/kdb.h>
106 #include <linux/ctype.h>
107 #include <linux/bsearch.h>
108 #include <linux/gcd.h>
109
110 #define MAX_NR_CON_DRIVER 16
111
112 #define CON_DRIVER_FLAG_MODULE 1
113 #define CON_DRIVER_FLAG_INIT 2
114 #define CON_DRIVER_FLAG_ATTR 4
115 #define CON_DRIVER_FLAG_ZOMBIE 8
116
117 struct con_driver {
118 const struct consw *con;
119 const char *desc;
120 struct device *dev;
121 int node;
122 int first;
123 int last;
124 int flag;
125 };
126
127 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
128 const struct consw *conswitchp;
129
130 /* A bitmap for codes <32. A bit of 1 indicates that the code
131 * corresponding to that bit number invokes some special action
132 * (such as cursor movement) and should not be displayed as a
133 * glyph unless the disp_ctrl mode is explicitly enabled.
134 */
135 #define CTRL_ACTION 0x0d00ff81
136 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
137
138 /*
139 * Here is the default bell parameters: 750HZ, 1/8th of a second
140 */
141 #define DEFAULT_BELL_PITCH 750
142 #define DEFAULT_BELL_DURATION (HZ/8)
143 #define DEFAULT_CURSOR_BLINK_MS 200
144
145 struct vc vc_cons [MAX_NR_CONSOLES];
146
147 #ifndef VT_SINGLE_DRIVER
148 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
149 #endif
150
151 static int con_open(struct tty_struct *, struct file *);
152 static void vc_init(struct vc_data *vc, unsigned int rows,
153 unsigned int cols, int do_clear);
154 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
155 static void save_cur(struct vc_data *vc);
156 static void reset_terminal(struct vc_data *vc, int do_clear);
157 static void con_flush_chars(struct tty_struct *tty);
158 static int set_vesa_blanking(char __user *p);
159 static void set_cursor(struct vc_data *vc);
160 static void hide_cursor(struct vc_data *vc);
161 static void console_callback(struct work_struct *ignored);
162 static void con_driver_unregister_callback(struct work_struct *ignored);
163 static void blank_screen_t(struct timer_list *unused);
164 static void set_palette(struct vc_data *vc);
165
166 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
167
168 static int printable; /* Is console ready for printing? */
169 int default_utf8 = true;
170 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
171 int global_cursor_default = -1;
172 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
173
174 static int cur_default = CUR_DEFAULT;
175 module_param(cur_default, int, S_IRUGO | S_IWUSR);
176
177 /*
178 * ignore_poke: don't unblank the screen when things are typed. This is
179 * mainly for the privacy of braille terminal users.
180 */
181 static int ignore_poke;
182
183 int do_poke_blanked_console;
184 int console_blanked;
185
186 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
187 static int vesa_off_interval;
188 static int blankinterval;
189 core_param(consoleblank, blankinterval, int, 0444);
190
191 static DECLARE_WORK(console_work, console_callback);
192 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
193
194 /*
195 * fg_console is the current virtual console,
196 * last_console is the last used one,
197 * want_console is the console we want to switch to,
198 * saved_* variants are for save/restore around kernel debugger enter/leave
199 */
200 int fg_console;
201 int last_console;
202 int want_console = -1;
203 static int saved_fg_console;
204 static int saved_last_console;
205 static int saved_want_console;
206 static int saved_vc_mode;
207 static int saved_console_blanked;
208
209 /*
210 * For each existing display, we have a pointer to console currently visible
211 * on that display, allowing consoles other than fg_console to be refreshed
212 * appropriately. Unless the low-level driver supplies its own display_fg
213 * variable, we use this one for the "master display".
214 */
215 static struct vc_data *master_display_fg;
216
217 /*
218 * Unfortunately, we need to delay tty echo when we're currently writing to the
219 * console since the code is (and always was) not re-entrant, so we schedule
220 * all flip requests to process context with schedule-task() and run it from
221 * console_callback().
222 */
223
224 /*
225 * For the same reason, we defer scrollback to the console callback.
226 */
227 static int scrollback_delta;
228
229 /*
230 * Hook so that the power management routines can (un)blank
231 * the console on our behalf.
232 */
233 int (*console_blank_hook)(int);
234
235 static DEFINE_TIMER(console_timer, blank_screen_t);
236 static int blank_state;
237 static int blank_timer_expired;
238 enum {
239 blank_off = 0,
240 blank_normal_wait,
241 blank_vesa_wait,
242 };
243
244 /*
245 * /sys/class/tty/tty0/
246 *
247 * the attribute 'active' contains the name of the current vc
248 * console and it supports poll() to detect vc switches
249 */
250 static struct device *tty0dev;
251
252 /*
253 * Notifier list for console events.
254 */
255 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
256
257 int register_vt_notifier(struct notifier_block *nb)
258 {
259 return atomic_notifier_chain_register(&vt_notifier_list, nb);
260 }
261 EXPORT_SYMBOL_GPL(register_vt_notifier);
262
263 int unregister_vt_notifier(struct notifier_block *nb)
264 {
265 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
266 }
267 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
268
269 static void notify_write(struct vc_data *vc, unsigned int unicode)
270 {
271 struct vt_notifier_param param = { .vc = vc, .c = unicode };
272 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
273 }
274
275 static void notify_update(struct vc_data *vc)
276 {
277 struct vt_notifier_param param = { .vc = vc };
278 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
279 }
280 /*
281 * Low-Level Functions
282 */
283
284 static inline bool con_is_fg(const struct vc_data *vc)
285 {
286 return vc->vc_num == fg_console;
287 }
288
289 static inline bool con_should_update(const struct vc_data *vc)
290 {
291 return con_is_visible(vc) && !console_blanked;
292 }
293
294 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
295 {
296 unsigned short *p;
297
298 if (!viewed)
299 p = (unsigned short *)(vc->vc_origin + offset);
300 else if (!vc->vc_sw->con_screen_pos)
301 p = (unsigned short *)(vc->vc_visible_origin + offset);
302 else
303 p = vc->vc_sw->con_screen_pos(vc, offset);
304 return p;
305 }
306
307 /* Called from the keyboard irq path.. */
308 static inline void scrolldelta(int lines)
309 {
310 /* FIXME */
311 /* scrolldelta needs some kind of consistency lock, but the BKL was
312 and still is not protecting versus the scheduled back end */
313 scrollback_delta += lines;
314 schedule_console_callback();
315 }
316
317 void schedule_console_callback(void)
318 {
319 schedule_work(&console_work);
320 }
321
322 /*
323 * Code to manage unicode-based screen buffers
324 */
325
326 #ifdef NO_VC_UNI_SCREEN
327 /* this disables and optimizes related code away at compile time */
328 #define get_vc_uniscr(vc) NULL
329 #else
330 #define get_vc_uniscr(vc) vc->vc_uni_screen
331 #endif
332
333 #define VC_UNI_SCREEN_DEBUG 0
334
335 typedef uint32_t char32_t;
336
337 /*
338 * Our screen buffer is preceded by an array of line pointers so that
339 * scrolling only implies some pointer shuffling.
340 */
341 struct uni_screen {
342 char32_t *lines[0];
343 };
344
345 static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
346 {
347 struct uni_screen *uniscr;
348 void *p;
349 unsigned int memsize, i;
350
351 /* allocate everything in one go */
352 memsize = cols * rows * sizeof(char32_t);
353 memsize += rows * sizeof(char32_t *);
354 p = vmalloc(memsize);
355 if (!p)
356 return NULL;
357
358 /* initial line pointers */
359 uniscr = p;
360 p = uniscr->lines + rows;
361 for (i = 0; i < rows; i++) {
362 uniscr->lines[i] = p;
363 p += cols * sizeof(char32_t);
364 }
365 return uniscr;
366 }
367
368 static void vc_uniscr_free(struct uni_screen *uniscr)
369 {
370 vfree(uniscr);
371 }
372
373 static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
374 {
375 vc_uniscr_free(vc->vc_uni_screen);
376 vc->vc_uni_screen = new_uniscr;
377 }
378
379 static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
380 {
381 struct uni_screen *uniscr = get_vc_uniscr(vc);
382
383 if (uniscr)
384 uniscr->lines[vc->vc_y][vc->vc_x] = uc;
385 }
386
387 static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
388 {
389 struct uni_screen *uniscr = get_vc_uniscr(vc);
390
391 if (uniscr) {
392 char32_t *ln = uniscr->lines[vc->vc_y];
393 unsigned int x = vc->vc_x, cols = vc->vc_cols;
394
395 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
396 memset32(&ln[x], ' ', nr);
397 }
398 }
399
400 static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
401 {
402 struct uni_screen *uniscr = get_vc_uniscr(vc);
403
404 if (uniscr) {
405 char32_t *ln = uniscr->lines[vc->vc_y];
406 unsigned int x = vc->vc_x, cols = vc->vc_cols;
407
408 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
409 memset32(&ln[cols - nr], ' ', nr);
410 }
411 }
412
413 static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
414 unsigned int nr)
415 {
416 struct uni_screen *uniscr = get_vc_uniscr(vc);
417
418 if (uniscr) {
419 char32_t *ln = uniscr->lines[vc->vc_y];
420
421 memset32(&ln[x], ' ', nr);
422 }
423 }
424
425 static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
426 unsigned int nr)
427 {
428 struct uni_screen *uniscr = get_vc_uniscr(vc);
429
430 if (uniscr) {
431 unsigned int cols = vc->vc_cols;
432
433 while (nr--)
434 memset32(uniscr->lines[y++], ' ', cols);
435 }
436 }
437
438 static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
439 enum con_scroll dir, unsigned int nr)
440 {
441 struct uni_screen *uniscr = get_vc_uniscr(vc);
442
443 if (uniscr) {
444 unsigned int i, j, k, sz, d, clear;
445
446 sz = b - t;
447 clear = b - nr;
448 d = nr;
449 if (dir == SM_DOWN) {
450 clear = t;
451 d = sz - nr;
452 }
453 for (i = 0; i < gcd(d, sz); i++) {
454 char32_t *tmp = uniscr->lines[t + i];
455 j = i;
456 while (1) {
457 k = j + d;
458 if (k >= sz)
459 k -= sz;
460 if (k == i)
461 break;
462 uniscr->lines[t + j] = uniscr->lines[t + k];
463 j = k;
464 }
465 uniscr->lines[t + j] = tmp;
466 }
467 vc_uniscr_clear_lines(vc, clear, nr);
468 }
469 }
470
471 static void vc_uniscr_copy_area(struct uni_screen *dst,
472 unsigned int dst_cols,
473 unsigned int dst_rows,
474 struct uni_screen *src,
475 unsigned int src_cols,
476 unsigned int src_top_row,
477 unsigned int src_bot_row)
478 {
479 unsigned int dst_row = 0;
480
481 if (!dst)
482 return;
483
484 while (src_top_row < src_bot_row) {
485 char32_t *src_line = src->lines[src_top_row];
486 char32_t *dst_line = dst->lines[dst_row];
487
488 memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
489 if (dst_cols - src_cols)
490 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
491 src_top_row++;
492 dst_row++;
493 }
494 while (dst_row < dst_rows) {
495 char32_t *dst_line = dst->lines[dst_row];
496
497 memset32(dst_line, ' ', dst_cols);
498 dst_row++;
499 }
500 }
501
502 /*
503 * Called from vcs_read() to make sure unicode screen retrieval is possible.
504 * This will initialize the unicode screen buffer if not already done.
505 * This returns 0 if OK, or a negative error code otherwise.
506 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
507 */
508 int vc_uniscr_check(struct vc_data *vc)
509 {
510 struct uni_screen *uniscr;
511 unsigned short *p;
512 int x, y, mask;
513
514 if (__is_defined(NO_VC_UNI_SCREEN))
515 return -EOPNOTSUPP;
516
517 WARN_CONSOLE_UNLOCKED();
518
519 if (!vc->vc_utf)
520 return -ENODATA;
521
522 if (vc->vc_uni_screen)
523 return 0;
524
525 uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
526 if (!uniscr)
527 return -ENOMEM;
528
529 /*
530 * Let's populate it initially with (imperfect) reverse translation.
531 * This is the next best thing we can do short of having it enabled
532 * from the start even when no users rely on this functionality. True
533 * unicode content will be available after a complete screen refresh.
534 */
535 p = (unsigned short *)vc->vc_origin;
536 mask = vc->vc_hi_font_mask | 0xff;
537 for (y = 0; y < vc->vc_rows; y++) {
538 char32_t *line = uniscr->lines[y];
539 for (x = 0; x < vc->vc_cols; x++) {
540 u16 glyph = scr_readw(p++) & mask;
541 line[x] = inverse_translate(vc, glyph, true);
542 }
543 }
544
545 vc->vc_uni_screen = uniscr;
546 return 0;
547 }
548
549 /*
550 * Called from vcs_read() to get the unicode data from the screen.
551 * This must be preceded by a successful call to vc_uniscr_check() once
552 * the console lock has been taken.
553 */
554 void vc_uniscr_copy_line(struct vc_data *vc, void *dest, int viewed,
555 unsigned int row, unsigned int col, unsigned int nr)
556 {
557 struct uni_screen *uniscr = get_vc_uniscr(vc);
558 int offset = row * vc->vc_size_row + col * 2;
559 unsigned long pos;
560
561 BUG_ON(!uniscr);
562
563 pos = (unsigned long)screenpos(vc, offset, viewed);
564 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
565 /*
566 * Desired position falls in the main screen buffer.
567 * However the actual row/col might be different if
568 * scrollback is active.
569 */
570 row = (pos - vc->vc_origin) / vc->vc_size_row;
571 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
572 memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
573 } else {
574 /*
575 * Scrollback is active. For now let's simply backtranslate
576 * the screen glyphs until the unicode screen buffer does
577 * synchronize with console display drivers for a scrollback
578 * buffer of its own.
579 */
580 u16 *p = (u16 *)pos;
581 int mask = vc->vc_hi_font_mask | 0xff;
582 char32_t *uni_buf = dest;
583 while (nr--) {
584 u16 glyph = scr_readw(p++) & mask;
585 *uni_buf++ = inverse_translate(vc, glyph, true);
586 }
587 }
588 }
589
590 /* this is for validation and debugging only */
591 static void vc_uniscr_debug_check(struct vc_data *vc)
592 {
593 struct uni_screen *uniscr = get_vc_uniscr(vc);
594 unsigned short *p;
595 int x, y, mask;
596
597 if (!VC_UNI_SCREEN_DEBUG || !uniscr)
598 return;
599
600 WARN_CONSOLE_UNLOCKED();
601
602 /*
603 * Make sure our unicode screen translates into the same glyphs
604 * as the actual screen. This is brutal indeed.
605 */
606 p = (unsigned short *)vc->vc_origin;
607 mask = vc->vc_hi_font_mask | 0xff;
608 for (y = 0; y < vc->vc_rows; y++) {
609 char32_t *line = uniscr->lines[y];
610 for (x = 0; x < vc->vc_cols; x++) {
611 u16 glyph = scr_readw(p++) & mask;
612 char32_t uc = line[x];
613 int tc = conv_uni_to_pc(vc, uc);
614 if (tc == -4)
615 tc = conv_uni_to_pc(vc, 0xfffd);
616 if (tc == -4)
617 tc = conv_uni_to_pc(vc, '?');
618 if (tc != glyph)
619 pr_err_ratelimited(
620 "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
621 __func__, x, y, glyph, tc);
622 }
623 }
624 }
625
626
627 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
628 enum con_scroll dir, unsigned int nr)
629 {
630 u16 *clear, *d, *s;
631
632 if (t + nr >= b)
633 nr = b - t - 1;
634 if (b > vc->vc_rows || t >= b || nr < 1)
635 return;
636 vc_uniscr_scroll(vc, t, b, dir, nr);
637 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
638 return;
639
640 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
641 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
642
643 if (dir == SM_UP) {
644 clear = s + (b - t - nr) * vc->vc_cols;
645 swap(s, d);
646 }
647 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
648 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
649 }
650
651 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
652 {
653 unsigned int xx, yy, offset;
654 u16 *p;
655
656 p = (u16 *) start;
657 if (!vc->vc_sw->con_getxy) {
658 offset = (start - vc->vc_origin) / 2;
659 xx = offset % vc->vc_cols;
660 yy = offset / vc->vc_cols;
661 } else {
662 int nxx, nyy;
663 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
664 xx = nxx; yy = nyy;
665 }
666 for(;;) {
667 u16 attrib = scr_readw(p) & 0xff00;
668 int startx = xx;
669 u16 *q = p;
670 while (xx < vc->vc_cols && count) {
671 if (attrib != (scr_readw(p) & 0xff00)) {
672 if (p > q)
673 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
674 startx = xx;
675 q = p;
676 attrib = scr_readw(p) & 0xff00;
677 }
678 p++;
679 xx++;
680 count--;
681 }
682 if (p > q)
683 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
684 if (!count)
685 break;
686 xx = 0;
687 yy++;
688 if (vc->vc_sw->con_getxy) {
689 p = (u16 *)start;
690 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
691 }
692 }
693 }
694
695 void update_region(struct vc_data *vc, unsigned long start, int count)
696 {
697 WARN_CONSOLE_UNLOCKED();
698
699 if (con_should_update(vc)) {
700 hide_cursor(vc);
701 do_update_region(vc, start, count);
702 set_cursor(vc);
703 }
704 }
705
706 /* Structure of attributes is hardware-dependent */
707
708 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
709 u8 _underline, u8 _reverse, u8 _italic)
710 {
711 if (vc->vc_sw->con_build_attr)
712 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
713 _blink, _underline, _reverse, _italic);
714
715 /*
716 * ++roman: I completely changed the attribute format for monochrome
717 * mode (!can_do_color). The formerly used MDA (monochrome display
718 * adapter) format didn't allow the combination of certain effects.
719 * Now the attribute is just a bit vector:
720 * Bit 0..1: intensity (0..2)
721 * Bit 2 : underline
722 * Bit 3 : reverse
723 * Bit 7 : blink
724 */
725 {
726 u8 a = _color;
727 if (!vc->vc_can_do_color)
728 return _intensity |
729 (_italic ? 2 : 0) |
730 (_underline ? 4 : 0) |
731 (_reverse ? 8 : 0) |
732 (_blink ? 0x80 : 0);
733 if (_italic)
734 a = (a & 0xF0) | vc->vc_itcolor;
735 else if (_underline)
736 a = (a & 0xf0) | vc->vc_ulcolor;
737 else if (_intensity == 0)
738 a = (a & 0xf0) | vc->vc_halfcolor;
739 if (_reverse)
740 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
741 if (_blink)
742 a ^= 0x80;
743 if (_intensity == 2)
744 a ^= 0x08;
745 if (vc->vc_hi_font_mask == 0x100)
746 a <<= 1;
747 return a;
748 }
749 }
750
751 static void update_attr(struct vc_data *vc)
752 {
753 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
754 vc->vc_blink, vc->vc_underline,
755 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
756 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
757 }
758
759 /* Note: inverting the screen twice should revert to the original state */
760 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
761 {
762 unsigned short *p;
763
764 WARN_CONSOLE_UNLOCKED();
765
766 count /= 2;
767 p = screenpos(vc, offset, viewed);
768 if (vc->vc_sw->con_invert_region) {
769 vc->vc_sw->con_invert_region(vc, p, count);
770 } else {
771 u16 *q = p;
772 int cnt = count;
773 u16 a;
774
775 if (!vc->vc_can_do_color) {
776 while (cnt--) {
777 a = scr_readw(q);
778 a ^= 0x0800;
779 scr_writew(a, q);
780 q++;
781 }
782 } else if (vc->vc_hi_font_mask == 0x100) {
783 while (cnt--) {
784 a = scr_readw(q);
785 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
786 scr_writew(a, q);
787 q++;
788 }
789 } else {
790 while (cnt--) {
791 a = scr_readw(q);
792 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
793 scr_writew(a, q);
794 q++;
795 }
796 }
797 }
798
799 if (con_should_update(vc))
800 do_update_region(vc, (unsigned long) p, count);
801 notify_update(vc);
802 }
803
804 /* used by selection: complement pointer position */
805 void complement_pos(struct vc_data *vc, int offset)
806 {
807 static int old_offset = -1;
808 static unsigned short old;
809 static unsigned short oldx, oldy;
810
811 WARN_CONSOLE_UNLOCKED();
812
813 if (old_offset != -1 && old_offset >= 0 &&
814 old_offset < vc->vc_screenbuf_size) {
815 scr_writew(old, screenpos(vc, old_offset, 1));
816 if (con_should_update(vc))
817 vc->vc_sw->con_putc(vc, old, oldy, oldx);
818 notify_update(vc);
819 }
820
821 old_offset = offset;
822
823 if (offset != -1 && offset >= 0 &&
824 offset < vc->vc_screenbuf_size) {
825 unsigned short new;
826 unsigned short *p;
827 p = screenpos(vc, offset, 1);
828 old = scr_readw(p);
829 new = old ^ vc->vc_complement_mask;
830 scr_writew(new, p);
831 if (con_should_update(vc)) {
832 oldx = (offset >> 1) % vc->vc_cols;
833 oldy = (offset >> 1) / vc->vc_cols;
834 vc->vc_sw->con_putc(vc, new, oldy, oldx);
835 }
836 notify_update(vc);
837 }
838 }
839
840 static void insert_char(struct vc_data *vc, unsigned int nr)
841 {
842 unsigned short *p = (unsigned short *) vc->vc_pos;
843
844 vc_uniscr_insert(vc, nr);
845 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
846 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
847 vc->vc_need_wrap = 0;
848 if (con_should_update(vc))
849 do_update_region(vc, (unsigned long) p,
850 vc->vc_cols - vc->vc_x);
851 }
852
853 static void delete_char(struct vc_data *vc, unsigned int nr)
854 {
855 unsigned short *p = (unsigned short *) vc->vc_pos;
856
857 vc_uniscr_delete(vc, nr);
858 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
859 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
860 nr * 2);
861 vc->vc_need_wrap = 0;
862 if (con_should_update(vc))
863 do_update_region(vc, (unsigned long) p,
864 vc->vc_cols - vc->vc_x);
865 }
866
867 static int softcursor_original = -1;
868
869 static void add_softcursor(struct vc_data *vc)
870 {
871 int i = scr_readw((u16 *) vc->vc_pos);
872 u32 type = vc->vc_cursor_type;
873
874 if (! (type & 0x10)) return;
875 if (softcursor_original != -1) return;
876 softcursor_original = i;
877 i |= ((type >> 8) & 0xff00 );
878 i ^= ((type) & 0xff00 );
879 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
880 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
881 scr_writew(i, (u16 *) vc->vc_pos);
882 if (con_should_update(vc))
883 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
884 }
885
886 static void hide_softcursor(struct vc_data *vc)
887 {
888 if (softcursor_original != -1) {
889 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
890 if (con_should_update(vc))
891 vc->vc_sw->con_putc(vc, softcursor_original,
892 vc->vc_y, vc->vc_x);
893 softcursor_original = -1;
894 }
895 }
896
897 static void hide_cursor(struct vc_data *vc)
898 {
899 if (vc_is_sel(vc))
900 clear_selection();
901
902 vc->vc_sw->con_cursor(vc, CM_ERASE);
903 hide_softcursor(vc);
904 }
905
906 static void set_cursor(struct vc_data *vc)
907 {
908 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
909 return;
910 if (vc->vc_deccm) {
911 if (vc_is_sel(vc))
912 clear_selection();
913 add_softcursor(vc);
914 if ((vc->vc_cursor_type & 0x0f) != 1)
915 vc->vc_sw->con_cursor(vc, CM_DRAW);
916 } else
917 hide_cursor(vc);
918 }
919
920 static void set_origin(struct vc_data *vc)
921 {
922 WARN_CONSOLE_UNLOCKED();
923
924 if (!con_is_visible(vc) ||
925 !vc->vc_sw->con_set_origin ||
926 !vc->vc_sw->con_set_origin(vc))
927 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
928 vc->vc_visible_origin = vc->vc_origin;
929 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
930 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
931 }
932
933 static void save_screen(struct vc_data *vc)
934 {
935 WARN_CONSOLE_UNLOCKED();
936
937 if (vc->vc_sw->con_save_screen)
938 vc->vc_sw->con_save_screen(vc);
939 }
940
941 static void flush_scrollback(struct vc_data *vc)
942 {
943 WARN_CONSOLE_UNLOCKED();
944
945 set_origin(vc);
946 if (vc->vc_sw->con_flush_scrollback) {
947 vc->vc_sw->con_flush_scrollback(vc);
948 } else if (con_is_visible(vc)) {
949 /*
950 * When no con_flush_scrollback method is provided then the
951 * legacy way for flushing the scrollback buffer is to use
952 * a side effect of the con_switch method. We do it only on
953 * the foreground console as background consoles have no
954 * scrollback buffers in that case and we obviously don't
955 * want to switch to them.
956 */
957 hide_cursor(vc);
958 vc->vc_sw->con_switch(vc);
959 set_cursor(vc);
960 }
961 }
962
963 /*
964 * Redrawing of screen
965 */
966
967 void clear_buffer_attributes(struct vc_data *vc)
968 {
969 unsigned short *p = (unsigned short *)vc->vc_origin;
970 int count = vc->vc_screenbuf_size / 2;
971 int mask = vc->vc_hi_font_mask | 0xff;
972
973 for (; count > 0; count--, p++) {
974 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
975 }
976 }
977
978 void redraw_screen(struct vc_data *vc, int is_switch)
979 {
980 int redraw = 0;
981
982 WARN_CONSOLE_UNLOCKED();
983
984 if (!vc) {
985 /* strange ... */
986 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
987 return;
988 }
989
990 if (is_switch) {
991 struct vc_data *old_vc = vc_cons[fg_console].d;
992 if (old_vc == vc)
993 return;
994 if (!con_is_visible(vc))
995 redraw = 1;
996 *vc->vc_display_fg = vc;
997 fg_console = vc->vc_num;
998 hide_cursor(old_vc);
999 if (!con_is_visible(old_vc)) {
1000 save_screen(old_vc);
1001 set_origin(old_vc);
1002 }
1003 if (tty0dev)
1004 sysfs_notify(&tty0dev->kobj, NULL, "active");
1005 } else {
1006 hide_cursor(vc);
1007 redraw = 1;
1008 }
1009
1010 if (redraw) {
1011 int update;
1012 int old_was_color = vc->vc_can_do_color;
1013
1014 set_origin(vc);
1015 update = vc->vc_sw->con_switch(vc);
1016 set_palette(vc);
1017 /*
1018 * If console changed from mono<->color, the best we can do
1019 * is to clear the buffer attributes. As it currently stands,
1020 * rebuilding new attributes from the old buffer is not doable
1021 * without overly complex code.
1022 */
1023 if (old_was_color != vc->vc_can_do_color) {
1024 update_attr(vc);
1025 clear_buffer_attributes(vc);
1026 }
1027
1028 if (update && vc->vc_mode != KD_GRAPHICS)
1029 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1030 }
1031 set_cursor(vc);
1032 if (is_switch) {
1033 set_leds();
1034 compute_shiftstate();
1035 notify_update(vc);
1036 }
1037 }
1038
1039 /*
1040 * Allocation, freeing and resizing of VTs.
1041 */
1042
1043 int vc_cons_allocated(unsigned int i)
1044 {
1045 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1046 }
1047
1048 static void visual_init(struct vc_data *vc, int num, int init)
1049 {
1050 /* ++Geert: vc->vc_sw->con_init determines console size */
1051 if (vc->vc_sw)
1052 module_put(vc->vc_sw->owner);
1053 vc->vc_sw = conswitchp;
1054 #ifndef VT_SINGLE_DRIVER
1055 if (con_driver_map[num])
1056 vc->vc_sw = con_driver_map[num];
1057 #endif
1058 __module_get(vc->vc_sw->owner);
1059 vc->vc_num = num;
1060 vc->vc_display_fg = &master_display_fg;
1061 if (vc->vc_uni_pagedir_loc)
1062 con_free_unimap(vc);
1063 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
1064 vc->vc_uni_pagedir = NULL;
1065 vc->vc_hi_font_mask = 0;
1066 vc->vc_complement_mask = 0;
1067 vc->vc_can_do_color = 0;
1068 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1069 vc->vc_sw->con_init(vc, init);
1070 if (!vc->vc_complement_mask)
1071 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1072 vc->vc_s_complement_mask = vc->vc_complement_mask;
1073 vc->vc_size_row = vc->vc_cols << 1;
1074 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1075 }
1076
1077
1078 static void visual_deinit(struct vc_data *vc)
1079 {
1080 vc->vc_sw->con_deinit(vc);
1081 module_put(vc->vc_sw->owner);
1082 }
1083
1084 static void vc_port_destruct(struct tty_port *port)
1085 {
1086 struct vc_data *vc = container_of(port, struct vc_data, port);
1087
1088 kfree(vc);
1089 }
1090
1091 static const struct tty_port_operations vc_port_ops = {
1092 .destruct = vc_port_destruct,
1093 };
1094
1095 int vc_allocate(unsigned int currcons) /* return 0 on success */
1096 {
1097 struct vt_notifier_param param;
1098 struct vc_data *vc;
1099
1100 WARN_CONSOLE_UNLOCKED();
1101
1102 if (currcons >= MAX_NR_CONSOLES)
1103 return -ENXIO;
1104
1105 if (vc_cons[currcons].d)
1106 return 0;
1107
1108 /* due to the granularity of kmalloc, we waste some memory here */
1109 /* the alloc is done in two steps, to optimize the common situation
1110 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1111 /* although the numbers above are not valid since long ago, the
1112 point is still up-to-date and the comment still has its value
1113 even if only as a historical artifact. --mj, July 1998 */
1114 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1115 if (!vc)
1116 return -ENOMEM;
1117
1118 vc_cons[currcons].d = vc;
1119 tty_port_init(&vc->port);
1120 vc->port.ops = &vc_port_ops;
1121 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1122
1123 visual_init(vc, currcons, 1);
1124
1125 if (!*vc->vc_uni_pagedir_loc)
1126 con_set_default_unimap(vc);
1127
1128 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1129 if (!vc->vc_screenbuf)
1130 goto err_free;
1131
1132 /* If no drivers have overridden us and the user didn't pass a
1133 boot option, default to displaying the cursor */
1134 if (global_cursor_default == -1)
1135 global_cursor_default = 1;
1136
1137 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1138 vcs_make_sysfs(currcons);
1139 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1140
1141 return 0;
1142 err_free:
1143 visual_deinit(vc);
1144 kfree(vc);
1145 vc_cons[currcons].d = NULL;
1146 return -ENOMEM;
1147 }
1148
1149 static inline int resize_screen(struct vc_data *vc, int width, int height,
1150 int user)
1151 {
1152 /* Resizes the resolution of the display adapater */
1153 int err = 0;
1154
1155 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
1156 err = vc->vc_sw->con_resize(vc, width, height, user);
1157
1158 return err;
1159 }
1160
1161 /*
1162 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1163 * [this is to be used together with some user program
1164 * like resize that changes the hardware videomode]
1165 */
1166 #define VC_RESIZE_MAXCOL (32767)
1167 #define VC_RESIZE_MAXROW (32767)
1168
1169 /**
1170 * vc_do_resize - resizing method for the tty
1171 * @tty: tty being resized
1172 * @real_tty: real tty (different to tty if a pty/tty pair)
1173 * @vc: virtual console private data
1174 * @cols: columns
1175 * @lines: lines
1176 *
1177 * Resize a virtual console, clipping according to the actual constraints.
1178 * If the caller passes a tty structure then update the termios winsize
1179 * information and perform any necessary signal handling.
1180 *
1181 * Caller must hold the console semaphore. Takes the termios rwsem and
1182 * ctrl_lock of the tty IFF a tty is passed.
1183 */
1184
1185 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1186 unsigned int cols, unsigned int lines)
1187 {
1188 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1189 unsigned long end;
1190 unsigned int old_rows, old_row_size, first_copied_row;
1191 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1192 unsigned int user;
1193 unsigned short *newscreen;
1194 struct uni_screen *new_uniscr = NULL;
1195
1196 WARN_CONSOLE_UNLOCKED();
1197
1198 if (!vc)
1199 return -ENXIO;
1200
1201 user = vc->vc_resize_user;
1202 vc->vc_resize_user = 0;
1203
1204 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
1205 return -EINVAL;
1206
1207 new_cols = (cols ? cols : vc->vc_cols);
1208 new_rows = (lines ? lines : vc->vc_rows);
1209 new_row_size = new_cols << 1;
1210 new_screen_size = new_row_size * new_rows;
1211
1212 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1213 return 0;
1214
1215 if (new_screen_size > KMALLOC_MAX_SIZE)
1216 return -EINVAL;
1217 newscreen = kzalloc(new_screen_size, GFP_USER);
1218 if (!newscreen)
1219 return -ENOMEM;
1220
1221 if (get_vc_uniscr(vc)) {
1222 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1223 if (!new_uniscr) {
1224 kfree(newscreen);
1225 return -ENOMEM;
1226 }
1227 }
1228
1229 if (vc_is_sel(vc))
1230 clear_selection();
1231
1232 old_rows = vc->vc_rows;
1233 old_row_size = vc->vc_size_row;
1234
1235 err = resize_screen(vc, new_cols, new_rows, user);
1236 if (err) {
1237 kfree(newscreen);
1238 vc_uniscr_free(new_uniscr);
1239 return err;
1240 }
1241
1242 vc->vc_rows = new_rows;
1243 vc->vc_cols = new_cols;
1244 vc->vc_size_row = new_row_size;
1245 vc->vc_screenbuf_size = new_screen_size;
1246
1247 rlth = min(old_row_size, new_row_size);
1248 rrem = new_row_size - rlth;
1249 old_origin = vc->vc_origin;
1250 new_origin = (long) newscreen;
1251 new_scr_end = new_origin + new_screen_size;
1252
1253 if (vc->vc_y > new_rows) {
1254 if (old_rows - vc->vc_y < new_rows) {
1255 /*
1256 * Cursor near the bottom, copy contents from the
1257 * bottom of buffer
1258 */
1259 first_copied_row = (old_rows - new_rows);
1260 } else {
1261 /*
1262 * Cursor is in no man's land, copy 1/2 screenful
1263 * from the top and bottom of cursor position
1264 */
1265 first_copied_row = (vc->vc_y - new_rows/2);
1266 }
1267 old_origin += first_copied_row * old_row_size;
1268 } else
1269 first_copied_row = 0;
1270 end = old_origin + old_row_size * min(old_rows, new_rows);
1271
1272 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1273 get_vc_uniscr(vc), rlth/2, first_copied_row,
1274 min(old_rows, new_rows));
1275 vc_uniscr_set(vc, new_uniscr);
1276
1277 update_attr(vc);
1278
1279 while (old_origin < end) {
1280 scr_memcpyw((unsigned short *) new_origin,
1281 (unsigned short *) old_origin, rlth);
1282 if (rrem)
1283 scr_memsetw((void *)(new_origin + rlth),
1284 vc->vc_video_erase_char, rrem);
1285 old_origin += old_row_size;
1286 new_origin += new_row_size;
1287 }
1288 if (new_scr_end > new_origin)
1289 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1290 new_scr_end - new_origin);
1291 kfree(vc->vc_screenbuf);
1292 vc->vc_screenbuf = newscreen;
1293 vc->vc_screenbuf_size = new_screen_size;
1294 set_origin(vc);
1295
1296 /* do part of a reset_terminal() */
1297 vc->vc_top = 0;
1298 vc->vc_bottom = vc->vc_rows;
1299 gotoxy(vc, vc->vc_x, vc->vc_y);
1300 save_cur(vc);
1301
1302 if (tty) {
1303 /* Rewrite the requested winsize data with the actual
1304 resulting sizes */
1305 struct winsize ws;
1306 memset(&ws, 0, sizeof(ws));
1307 ws.ws_row = vc->vc_rows;
1308 ws.ws_col = vc->vc_cols;
1309 ws.ws_ypixel = vc->vc_scan_lines;
1310 tty_do_resize(tty, &ws);
1311 }
1312
1313 if (con_is_visible(vc))
1314 update_screen(vc);
1315 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1316 notify_update(vc);
1317 return err;
1318 }
1319
1320 /**
1321 * vc_resize - resize a VT
1322 * @vc: virtual console
1323 * @cols: columns
1324 * @rows: rows
1325 *
1326 * Resize a virtual console as seen from the console end of things. We
1327 * use the common vc_do_resize methods to update the structures. The
1328 * caller must hold the console sem to protect console internals and
1329 * vc->port.tty
1330 */
1331
1332 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1333 {
1334 return vc_do_resize(vc->port.tty, vc, cols, rows);
1335 }
1336
1337 /**
1338 * vt_resize - resize a VT
1339 * @tty: tty to resize
1340 * @ws: winsize attributes
1341 *
1342 * Resize a virtual terminal. This is called by the tty layer as we
1343 * register our own handler for resizing. The mutual helper does all
1344 * the actual work.
1345 *
1346 * Takes the console sem and the called methods then take the tty
1347 * termios_rwsem and the tty ctrl_lock in that order.
1348 */
1349 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1350 {
1351 struct vc_data *vc = tty->driver_data;
1352 int ret;
1353
1354 console_lock();
1355 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1356 console_unlock();
1357 return ret;
1358 }
1359
1360 struct vc_data *vc_deallocate(unsigned int currcons)
1361 {
1362 struct vc_data *vc = NULL;
1363
1364 WARN_CONSOLE_UNLOCKED();
1365
1366 if (vc_cons_allocated(currcons)) {
1367 struct vt_notifier_param param;
1368
1369 param.vc = vc = vc_cons[currcons].d;
1370 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1371 vcs_remove_sysfs(currcons);
1372 visual_deinit(vc);
1373 put_pid(vc->vt_pid);
1374 vc_uniscr_set(vc, NULL);
1375 kfree(vc->vc_screenbuf);
1376 vc_cons[currcons].d = NULL;
1377 }
1378 return vc;
1379 }
1380
1381 /*
1382 * VT102 emulator
1383 */
1384
1385 enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1386
1387 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1388 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1389 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1390
1391 #define decarm VC_REPEAT
1392 #define decckm VC_CKMODE
1393 #define kbdapplic VC_APPLIC
1394 #define lnm VC_CRLF
1395
1396 /*
1397 * this is what the terminal answers to a ESC-Z or csi0c query.
1398 */
1399 #define VT100ID "\033[?1;2c"
1400 #define VT102ID "\033[?6c"
1401
1402 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1403 8,12,10,14, 9,13,11,15 };
1404
1405 /* the default colour table, for VGA+ colour systems */
1406 unsigned char default_red[] = {
1407 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1408 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1409 };
1410 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1411
1412 unsigned char default_grn[] = {
1413 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1414 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1415 };
1416 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1417
1418 unsigned char default_blu[] = {
1419 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1420 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1421 };
1422 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1423
1424 /*
1425 * gotoxy() must verify all boundaries, because the arguments
1426 * might also be negative. If the given position is out of
1427 * bounds, the cursor is placed at the nearest margin.
1428 */
1429 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1430 {
1431 int min_y, max_y;
1432
1433 if (new_x < 0)
1434 vc->vc_x = 0;
1435 else {
1436 if (new_x >= vc->vc_cols)
1437 vc->vc_x = vc->vc_cols - 1;
1438 else
1439 vc->vc_x = new_x;
1440 }
1441
1442 if (vc->vc_decom) {
1443 min_y = vc->vc_top;
1444 max_y = vc->vc_bottom;
1445 } else {
1446 min_y = 0;
1447 max_y = vc->vc_rows;
1448 }
1449 if (new_y < min_y)
1450 vc->vc_y = min_y;
1451 else if (new_y >= max_y)
1452 vc->vc_y = max_y - 1;
1453 else
1454 vc->vc_y = new_y;
1455 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1456 vc->vc_need_wrap = 0;
1457 }
1458
1459 /* for absolute user moves, when decom is set */
1460 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1461 {
1462 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1463 }
1464
1465 void scrollback(struct vc_data *vc)
1466 {
1467 scrolldelta(-(vc->vc_rows / 2));
1468 }
1469
1470 void scrollfront(struct vc_data *vc, int lines)
1471 {
1472 if (!lines)
1473 lines = vc->vc_rows / 2;
1474 scrolldelta(lines);
1475 }
1476
1477 static void lf(struct vc_data *vc)
1478 {
1479 /* don't scroll if above bottom of scrolling region, or
1480 * if below scrolling region
1481 */
1482 if (vc->vc_y + 1 == vc->vc_bottom)
1483 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1484 else if (vc->vc_y < vc->vc_rows - 1) {
1485 vc->vc_y++;
1486 vc->vc_pos += vc->vc_size_row;
1487 }
1488 vc->vc_need_wrap = 0;
1489 notify_write(vc, '\n');
1490 }
1491
1492 static void ri(struct vc_data *vc)
1493 {
1494 /* don't scroll if below top of scrolling region, or
1495 * if above scrolling region
1496 */
1497 if (vc->vc_y == vc->vc_top)
1498 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1499 else if (vc->vc_y > 0) {
1500 vc->vc_y--;
1501 vc->vc_pos -= vc->vc_size_row;
1502 }
1503 vc->vc_need_wrap = 0;
1504 }
1505
1506 static inline void cr(struct vc_data *vc)
1507 {
1508 vc->vc_pos -= vc->vc_x << 1;
1509 vc->vc_need_wrap = vc->vc_x = 0;
1510 notify_write(vc, '\r');
1511 }
1512
1513 static inline void bs(struct vc_data *vc)
1514 {
1515 if (vc->vc_x) {
1516 vc->vc_pos -= 2;
1517 vc->vc_x--;
1518 vc->vc_need_wrap = 0;
1519 notify_write(vc, '\b');
1520 }
1521 }
1522
1523 static inline void del(struct vc_data *vc)
1524 {
1525 /* ignored */
1526 }
1527
1528 static void csi_J(struct vc_data *vc, int vpar)
1529 {
1530 unsigned int count;
1531 unsigned short * start;
1532
1533 switch (vpar) {
1534 case 0: /* erase from cursor to end of display */
1535 vc_uniscr_clear_line(vc, vc->vc_x,
1536 vc->vc_cols - vc->vc_x);
1537 vc_uniscr_clear_lines(vc, vc->vc_y + 1,
1538 vc->vc_rows - vc->vc_y - 1);
1539 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1540 start = (unsigned short *)vc->vc_pos;
1541 break;
1542 case 1: /* erase from start to cursor */
1543 vc_uniscr_clear_line(vc, 0, vc->vc_x + 1);
1544 vc_uniscr_clear_lines(vc, 0, vc->vc_y);
1545 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1546 start = (unsigned short *)vc->vc_origin;
1547 break;
1548 case 3: /* include scrollback */
1549 flush_scrollback(vc);
1550 /* fallthrough */
1551 case 2: /* erase whole display */
1552 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1553 count = vc->vc_cols * vc->vc_rows;
1554 start = (unsigned short *)vc->vc_origin;
1555 break;
1556 default:
1557 return;
1558 }
1559 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1560 if (con_should_update(vc))
1561 do_update_region(vc, (unsigned long) start, count);
1562 vc->vc_need_wrap = 0;
1563 }
1564
1565 static void csi_K(struct vc_data *vc, int vpar)
1566 {
1567 unsigned int count;
1568 unsigned short *start = (unsigned short *)vc->vc_pos;
1569 int offset;
1570
1571 switch (vpar) {
1572 case 0: /* erase from cursor to end of line */
1573 offset = 0;
1574 count = vc->vc_cols - vc->vc_x;
1575 break;
1576 case 1: /* erase from start of line to cursor */
1577 offset = -vc->vc_x;
1578 count = vc->vc_x + 1;
1579 break;
1580 case 2: /* erase whole line */
1581 offset = -vc->vc_x;
1582 count = vc->vc_cols;
1583 break;
1584 default:
1585 return;
1586 }
1587 vc_uniscr_clear_line(vc, vc->vc_x + offset, count);
1588 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1589 vc->vc_need_wrap = 0;
1590 if (con_should_update(vc))
1591 do_update_region(vc, (unsigned long)(start + offset), count);
1592 }
1593
1594 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1595 { /* not vt100? */
1596 int count;
1597
1598 if (!vpar)
1599 vpar++;
1600 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1601
1602 vc_uniscr_clear_line(vc, vc->vc_x, count);
1603 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1604 if (con_should_update(vc))
1605 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1606 vc->vc_need_wrap = 0;
1607 }
1608
1609 static void default_attr(struct vc_data *vc)
1610 {
1611 vc->vc_intensity = 1;
1612 vc->vc_italic = 0;
1613 vc->vc_underline = 0;
1614 vc->vc_reverse = 0;
1615 vc->vc_blink = 0;
1616 vc->vc_color = vc->vc_def_color;
1617 }
1618
1619 struct rgb { u8 r; u8 g; u8 b; };
1620
1621 static void rgb_from_256(int i, struct rgb *c)
1622 {
1623 if (i < 8) { /* Standard colours. */
1624 c->r = i&1 ? 0xaa : 0x00;
1625 c->g = i&2 ? 0xaa : 0x00;
1626 c->b = i&4 ? 0xaa : 0x00;
1627 } else if (i < 16) {
1628 c->r = i&1 ? 0xff : 0x55;
1629 c->g = i&2 ? 0xff : 0x55;
1630 c->b = i&4 ? 0xff : 0x55;
1631 } else if (i < 232) { /* 6x6x6 colour cube. */
1632 c->r = (i - 16) / 36 * 85 / 2;
1633 c->g = (i - 16) / 6 % 6 * 85 / 2;
1634 c->b = (i - 16) % 6 * 85 / 2;
1635 } else /* Grayscale ramp. */
1636 c->r = c->g = c->b = i * 10 - 2312;
1637 }
1638
1639 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1640 {
1641 u8 hue = 0, max = max3(c->r, c->g, c->b);
1642
1643 if (c->r > max / 2)
1644 hue |= 4;
1645 if (c->g > max / 2)
1646 hue |= 2;
1647 if (c->b > max / 2)
1648 hue |= 1;
1649
1650 if (hue == 7 && max <= 0x55) {
1651 hue = 0;
1652 vc->vc_intensity = 2;
1653 } else if (max > 0xaa)
1654 vc->vc_intensity = 2;
1655 else
1656 vc->vc_intensity = 1;
1657
1658 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1659 }
1660
1661 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1662 {
1663 /* For backgrounds, err on the dark side. */
1664 vc->vc_color = (vc->vc_color & 0x0f)
1665 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1666 }
1667
1668 /*
1669 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1670 * and thus need to be detected and ignored by hand. That standard also
1671 * wants : rather than ; as separators but sequences containing : are currently
1672 * completely ignored by the parser.
1673 *
1674 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1675 * supporting them.
1676 */
1677 static int vc_t416_color(struct vc_data *vc, int i,
1678 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1679 {
1680 struct rgb c;
1681
1682 i++;
1683 if (i > vc->vc_npar)
1684 return i;
1685
1686 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1687 /* 256 colours */
1688 i++;
1689 rgb_from_256(vc->vc_par[i], &c);
1690 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1691 /* 24 bit */
1692 c.r = vc->vc_par[i + 1];
1693 c.g = vc->vc_par[i + 2];
1694 c.b = vc->vc_par[i + 3];
1695 i += 3;
1696 } else
1697 return i;
1698
1699 set_color(vc, &c);
1700
1701 return i;
1702 }
1703
1704 /* console_lock is held */
1705 static void csi_m(struct vc_data *vc)
1706 {
1707 int i;
1708
1709 for (i = 0; i <= vc->vc_npar; i++)
1710 switch (vc->vc_par[i]) {
1711 case 0: /* all attributes off */
1712 default_attr(vc);
1713 break;
1714 case 1:
1715 vc->vc_intensity = 2;
1716 break;
1717 case 2:
1718 vc->vc_intensity = 0;
1719 break;
1720 case 3:
1721 vc->vc_italic = 1;
1722 break;
1723 case 21:
1724 /*
1725 * No console drivers support double underline, so
1726 * convert it to a single underline.
1727 */
1728 case 4:
1729 vc->vc_underline = 1;
1730 break;
1731 case 5:
1732 vc->vc_blink = 1;
1733 break;
1734 case 7:
1735 vc->vc_reverse = 1;
1736 break;
1737 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1738 * Select primary font, don't display control chars if
1739 * defined, don't set bit 8 on output.
1740 */
1741 vc->vc_translate = set_translate(vc->vc_charset == 0
1742 ? vc->vc_G0_charset
1743 : vc->vc_G1_charset, vc);
1744 vc->vc_disp_ctrl = 0;
1745 vc->vc_toggle_meta = 0;
1746 break;
1747 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1748 * Select first alternate font, lets chars < 32 be
1749 * displayed as ROM chars.
1750 */
1751 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1752 vc->vc_disp_ctrl = 1;
1753 vc->vc_toggle_meta = 0;
1754 break;
1755 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1756 * Select second alternate font, toggle high bit
1757 * before displaying as ROM char.
1758 */
1759 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1760 vc->vc_disp_ctrl = 1;
1761 vc->vc_toggle_meta = 1;
1762 break;
1763 case 22:
1764 vc->vc_intensity = 1;
1765 break;
1766 case 23:
1767 vc->vc_italic = 0;
1768 break;
1769 case 24:
1770 vc->vc_underline = 0;
1771 break;
1772 case 25:
1773 vc->vc_blink = 0;
1774 break;
1775 case 27:
1776 vc->vc_reverse = 0;
1777 break;
1778 case 38:
1779 i = vc_t416_color(vc, i, rgb_foreground);
1780 break;
1781 case 48:
1782 i = vc_t416_color(vc, i, rgb_background);
1783 break;
1784 case 39:
1785 vc->vc_color = (vc->vc_def_color & 0x0f) |
1786 (vc->vc_color & 0xf0);
1787 break;
1788 case 49:
1789 vc->vc_color = (vc->vc_def_color & 0xf0) |
1790 (vc->vc_color & 0x0f);
1791 break;
1792 default:
1793 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1794 if (vc->vc_par[i] < 100)
1795 vc->vc_intensity = 2;
1796 vc->vc_par[i] -= 60;
1797 }
1798 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1799 vc->vc_color = color_table[vc->vc_par[i] - 30]
1800 | (vc->vc_color & 0xf0);
1801 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1802 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1803 | (vc->vc_color & 0x0f);
1804 break;
1805 }
1806 update_attr(vc);
1807 }
1808
1809 static void respond_string(const char *p, struct tty_port *port)
1810 {
1811 while (*p) {
1812 tty_insert_flip_char(port, *p, 0);
1813 p++;
1814 }
1815 tty_schedule_flip(port);
1816 }
1817
1818 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1819 {
1820 char buf[40];
1821
1822 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1823 respond_string(buf, tty->port);
1824 }
1825
1826 static inline void status_report(struct tty_struct *tty)
1827 {
1828 respond_string("\033[0n", tty->port); /* Terminal ok */
1829 }
1830
1831 static inline void respond_ID(struct tty_struct *tty)
1832 {
1833 respond_string(VT102ID, tty->port);
1834 }
1835
1836 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1837 {
1838 char buf[8];
1839
1840 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1841 (char)('!' + mry));
1842 respond_string(buf, tty->port);
1843 }
1844
1845 /* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1846 int mouse_reporting(void)
1847 {
1848 return vc_cons[fg_console].d->vc_report_mouse;
1849 }
1850
1851 /* console_lock is held */
1852 static void set_mode(struct vc_data *vc, int on_off)
1853 {
1854 int i;
1855
1856 for (i = 0; i <= vc->vc_npar; i++)
1857 if (vc->vc_priv == EPdec) {
1858 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1859 case 1: /* Cursor keys send ^[Ox/^[[x */
1860 if (on_off)
1861 set_kbd(vc, decckm);
1862 else
1863 clr_kbd(vc, decckm);
1864 break;
1865 case 3: /* 80/132 mode switch unimplemented */
1866 #if 0
1867 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1868 /* this alone does not suffice; some user mode
1869 utility has to change the hardware regs */
1870 #endif
1871 break;
1872 case 5: /* Inverted screen on/off */
1873 if (vc->vc_decscnm != on_off) {
1874 vc->vc_decscnm = on_off;
1875 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1876 update_attr(vc);
1877 }
1878 break;
1879 case 6: /* Origin relative/absolute */
1880 vc->vc_decom = on_off;
1881 gotoxay(vc, 0, 0);
1882 break;
1883 case 7: /* Autowrap on/off */
1884 vc->vc_decawm = on_off;
1885 break;
1886 case 8: /* Autorepeat on/off */
1887 if (on_off)
1888 set_kbd(vc, decarm);
1889 else
1890 clr_kbd(vc, decarm);
1891 break;
1892 case 9:
1893 vc->vc_report_mouse = on_off ? 1 : 0;
1894 break;
1895 case 25: /* Cursor on/off */
1896 vc->vc_deccm = on_off;
1897 break;
1898 case 1000:
1899 vc->vc_report_mouse = on_off ? 2 : 0;
1900 break;
1901 }
1902 } else {
1903 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1904 case 3: /* Monitor (display ctrls) */
1905 vc->vc_disp_ctrl = on_off;
1906 break;
1907 case 4: /* Insert Mode on/off */
1908 vc->vc_decim = on_off;
1909 break;
1910 case 20: /* Lf, Enter == CrLf/Lf */
1911 if (on_off)
1912 set_kbd(vc, lnm);
1913 else
1914 clr_kbd(vc, lnm);
1915 break;
1916 }
1917 }
1918 }
1919
1920 /* console_lock is held */
1921 static void setterm_command(struct vc_data *vc)
1922 {
1923 switch (vc->vc_par[0]) {
1924 case 1: /* set color for underline mode */
1925 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1926 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1927 if (vc->vc_underline)
1928 update_attr(vc);
1929 }
1930 break;
1931 case 2: /* set color for half intensity mode */
1932 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1933 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1934 if (vc->vc_intensity == 0)
1935 update_attr(vc);
1936 }
1937 break;
1938 case 8: /* store colors as defaults */
1939 vc->vc_def_color = vc->vc_attr;
1940 if (vc->vc_hi_font_mask == 0x100)
1941 vc->vc_def_color >>= 1;
1942 default_attr(vc);
1943 update_attr(vc);
1944 break;
1945 case 9: /* set blanking interval */
1946 blankinterval = min(vc->vc_par[1], 60U) * 60;
1947 poke_blanked_console();
1948 break;
1949 case 10: /* set bell frequency in Hz */
1950 if (vc->vc_npar >= 1)
1951 vc->vc_bell_pitch = vc->vc_par[1];
1952 else
1953 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1954 break;
1955 case 11: /* set bell duration in msec */
1956 if (vc->vc_npar >= 1)
1957 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1958 msecs_to_jiffies(vc->vc_par[1]) : 0;
1959 else
1960 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1961 break;
1962 case 12: /* bring specified console to the front */
1963 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1964 set_console(vc->vc_par[1] - 1);
1965 break;
1966 case 13: /* unblank the screen */
1967 poke_blanked_console();
1968 break;
1969 case 14: /* set vesa powerdown interval */
1970 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
1971 break;
1972 case 15: /* activate the previous console */
1973 set_console(last_console);
1974 break;
1975 case 16: /* set cursor blink duration in msec */
1976 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1977 vc->vc_par[1] <= USHRT_MAX)
1978 vc->vc_cur_blink_ms = vc->vc_par[1];
1979 else
1980 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1981 break;
1982 }
1983 }
1984
1985 /* console_lock is held */
1986 static void csi_at(struct vc_data *vc, unsigned int nr)
1987 {
1988 if (nr > vc->vc_cols - vc->vc_x)
1989 nr = vc->vc_cols - vc->vc_x;
1990 else if (!nr)
1991 nr = 1;
1992 insert_char(vc, nr);
1993 }
1994
1995 /* console_lock is held */
1996 static void csi_L(struct vc_data *vc, unsigned int nr)
1997 {
1998 if (nr > vc->vc_rows - vc->vc_y)
1999 nr = vc->vc_rows - vc->vc_y;
2000 else if (!nr)
2001 nr = 1;
2002 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
2003 vc->vc_need_wrap = 0;
2004 }
2005
2006 /* console_lock is held */
2007 static void csi_P(struct vc_data *vc, unsigned int nr)
2008 {
2009 if (nr > vc->vc_cols - vc->vc_x)
2010 nr = vc->vc_cols - vc->vc_x;
2011 else if (!nr)
2012 nr = 1;
2013 delete_char(vc, nr);
2014 }
2015
2016 /* console_lock is held */
2017 static void csi_M(struct vc_data *vc, unsigned int nr)
2018 {
2019 if (nr > vc->vc_rows - vc->vc_y)
2020 nr = vc->vc_rows - vc->vc_y;
2021 else if (!nr)
2022 nr=1;
2023 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
2024 vc->vc_need_wrap = 0;
2025 }
2026
2027 /* console_lock is held (except via vc_init->reset_terminal */
2028 static void save_cur(struct vc_data *vc)
2029 {
2030 vc->vc_saved_x = vc->vc_x;
2031 vc->vc_saved_y = vc->vc_y;
2032 vc->vc_s_intensity = vc->vc_intensity;
2033 vc->vc_s_italic = vc->vc_italic;
2034 vc->vc_s_underline = vc->vc_underline;
2035 vc->vc_s_blink = vc->vc_blink;
2036 vc->vc_s_reverse = vc->vc_reverse;
2037 vc->vc_s_charset = vc->vc_charset;
2038 vc->vc_s_color = vc->vc_color;
2039 vc->vc_saved_G0 = vc->vc_G0_charset;
2040 vc->vc_saved_G1 = vc->vc_G1_charset;
2041 }
2042
2043 /* console_lock is held */
2044 static void restore_cur(struct vc_data *vc)
2045 {
2046 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
2047 vc->vc_intensity = vc->vc_s_intensity;
2048 vc->vc_italic = vc->vc_s_italic;
2049 vc->vc_underline = vc->vc_s_underline;
2050 vc->vc_blink = vc->vc_s_blink;
2051 vc->vc_reverse = vc->vc_s_reverse;
2052 vc->vc_charset = vc->vc_s_charset;
2053 vc->vc_color = vc->vc_s_color;
2054 vc->vc_G0_charset = vc->vc_saved_G0;
2055 vc->vc_G1_charset = vc->vc_saved_G1;
2056 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
2057 update_attr(vc);
2058 vc->vc_need_wrap = 0;
2059 }
2060
2061 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2062 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2063 ESpalette, ESosc };
2064
2065 /* console_lock is held (except via vc_init()) */
2066 static void reset_terminal(struct vc_data *vc, int do_clear)
2067 {
2068 vc->vc_top = 0;
2069 vc->vc_bottom = vc->vc_rows;
2070 vc->vc_state = ESnormal;
2071 vc->vc_priv = EPecma;
2072 vc->vc_translate = set_translate(LAT1_MAP, vc);
2073 vc->vc_G0_charset = LAT1_MAP;
2074 vc->vc_G1_charset = GRAF_MAP;
2075 vc->vc_charset = 0;
2076 vc->vc_need_wrap = 0;
2077 vc->vc_report_mouse = 0;
2078 vc->vc_utf = default_utf8;
2079 vc->vc_utf_count = 0;
2080
2081 vc->vc_disp_ctrl = 0;
2082 vc->vc_toggle_meta = 0;
2083
2084 vc->vc_decscnm = 0;
2085 vc->vc_decom = 0;
2086 vc->vc_decawm = 1;
2087 vc->vc_deccm = global_cursor_default;
2088 vc->vc_decim = 0;
2089
2090 vt_reset_keyboard(vc->vc_num);
2091
2092 vc->vc_cursor_type = cur_default;
2093 vc->vc_complement_mask = vc->vc_s_complement_mask;
2094
2095 default_attr(vc);
2096 update_attr(vc);
2097
2098 vc->vc_tab_stop[0] =
2099 vc->vc_tab_stop[1] =
2100 vc->vc_tab_stop[2] =
2101 vc->vc_tab_stop[3] =
2102 vc->vc_tab_stop[4] =
2103 vc->vc_tab_stop[5] =
2104 vc->vc_tab_stop[6] =
2105 vc->vc_tab_stop[7] = 0x01010101;
2106
2107 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2108 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2109 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2110
2111 gotoxy(vc, 0, 0);
2112 save_cur(vc);
2113 if (do_clear)
2114 csi_J(vc, 2);
2115 }
2116
2117 /* console_lock is held */
2118 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2119 {
2120 /*
2121 * Control characters can be used in the _middle_
2122 * of an escape sequence.
2123 */
2124 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2125 return;
2126 switch (c) {
2127 case 0:
2128 return;
2129 case 7:
2130 if (vc->vc_state == ESosc)
2131 vc->vc_state = ESnormal;
2132 else if (vc->vc_bell_duration)
2133 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2134 return;
2135 case 8:
2136 bs(vc);
2137 return;
2138 case 9:
2139 vc->vc_pos -= (vc->vc_x << 1);
2140 while (vc->vc_x < vc->vc_cols - 1) {
2141 vc->vc_x++;
2142 if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
2143 break;
2144 }
2145 vc->vc_pos += (vc->vc_x << 1);
2146 notify_write(vc, '\t');
2147 return;
2148 case 10: case 11: case 12:
2149 lf(vc);
2150 if (!is_kbd(vc, lnm))
2151 return;
2152 /* fall through */
2153 case 13:
2154 cr(vc);
2155 return;
2156 case 14:
2157 vc->vc_charset = 1;
2158 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2159 vc->vc_disp_ctrl = 1;
2160 return;
2161 case 15:
2162 vc->vc_charset = 0;
2163 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2164 vc->vc_disp_ctrl = 0;
2165 return;
2166 case 24: case 26:
2167 vc->vc_state = ESnormal;
2168 return;
2169 case 27:
2170 vc->vc_state = ESesc;
2171 return;
2172 case 127:
2173 del(vc);
2174 return;
2175 case 128+27:
2176 vc->vc_state = ESsquare;
2177 return;
2178 }
2179 switch(vc->vc_state) {
2180 case ESesc:
2181 vc->vc_state = ESnormal;
2182 switch (c) {
2183 case '[':
2184 vc->vc_state = ESsquare;
2185 return;
2186 case ']':
2187 vc->vc_state = ESnonstd;
2188 return;
2189 case '%':
2190 vc->vc_state = ESpercent;
2191 return;
2192 case 'E':
2193 cr(vc);
2194 lf(vc);
2195 return;
2196 case 'M':
2197 ri(vc);
2198 return;
2199 case 'D':
2200 lf(vc);
2201 return;
2202 case 'H':
2203 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
2204 return;
2205 case 'Z':
2206 respond_ID(tty);
2207 return;
2208 case '7':
2209 save_cur(vc);
2210 return;
2211 case '8':
2212 restore_cur(vc);
2213 return;
2214 case '(':
2215 vc->vc_state = ESsetG0;
2216 return;
2217 case ')':
2218 vc->vc_state = ESsetG1;
2219 return;
2220 case '#':
2221 vc->vc_state = EShash;
2222 return;
2223 case 'c':
2224 reset_terminal(vc, 1);
2225 return;
2226 case '>': /* Numeric keypad */
2227 clr_kbd(vc, kbdapplic);
2228 return;
2229 case '=': /* Appl. keypad */
2230 set_kbd(vc, kbdapplic);
2231 return;
2232 }
2233 return;
2234 case ESnonstd:
2235 if (c=='P') { /* palette escape sequence */
2236 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2237 vc->vc_par[vc->vc_npar] = 0;
2238 vc->vc_npar = 0;
2239 vc->vc_state = ESpalette;
2240 return;
2241 } else if (c=='R') { /* reset palette */
2242 reset_palette(vc);
2243 vc->vc_state = ESnormal;
2244 } else if (c>='0' && c<='9')
2245 vc->vc_state = ESosc;
2246 else
2247 vc->vc_state = ESnormal;
2248 return;
2249 case ESpalette:
2250 if (isxdigit(c)) {
2251 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2252 if (vc->vc_npar == 7) {
2253 int i = vc->vc_par[0] * 3, j = 1;
2254 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2255 vc->vc_palette[i++] += vc->vc_par[j++];
2256 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2257 vc->vc_palette[i++] += vc->vc_par[j++];
2258 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2259 vc->vc_palette[i] += vc->vc_par[j];
2260 set_palette(vc);
2261 vc->vc_state = ESnormal;
2262 }
2263 } else
2264 vc->vc_state = ESnormal;
2265 return;
2266 case ESsquare:
2267 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2268 vc->vc_par[vc->vc_npar] = 0;
2269 vc->vc_npar = 0;
2270 vc->vc_state = ESgetpars;
2271 if (c == '[') { /* Function key */
2272 vc->vc_state=ESfunckey;
2273 return;
2274 }
2275 switch (c) {
2276 case '?':
2277 vc->vc_priv = EPdec;
2278 return;
2279 case '>':
2280 vc->vc_priv = EPgt;
2281 return;
2282 case '=':
2283 vc->vc_priv = EPeq;
2284 return;
2285 case '<':
2286 vc->vc_priv = EPlt;
2287 return;
2288 }
2289 vc->vc_priv = EPecma;
2290 /* fall through */
2291 case ESgetpars:
2292 if (c == ';' && vc->vc_npar < NPAR - 1) {
2293 vc->vc_npar++;
2294 return;
2295 } else if (c>='0' && c<='9') {
2296 vc->vc_par[vc->vc_npar] *= 10;
2297 vc->vc_par[vc->vc_npar] += c - '0';
2298 return;
2299 }
2300 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2301 vc->vc_state = EScsiignore;
2302 return;
2303 }
2304 vc->vc_state = ESnormal;
2305 switch(c) {
2306 case 'h':
2307 if (vc->vc_priv <= EPdec)
2308 set_mode(vc, 1);
2309 return;
2310 case 'l':
2311 if (vc->vc_priv <= EPdec)
2312 set_mode(vc, 0);
2313 return;
2314 case 'c':
2315 if (vc->vc_priv == EPdec) {
2316 if (vc->vc_par[0])
2317 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
2318 else
2319 vc->vc_cursor_type = cur_default;
2320 return;
2321 }
2322 break;
2323 case 'm':
2324 if (vc->vc_priv == EPdec) {
2325 clear_selection();
2326 if (vc->vc_par[0])
2327 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2328 else
2329 vc->vc_complement_mask = vc->vc_s_complement_mask;
2330 return;
2331 }
2332 break;
2333 case 'n':
2334 if (vc->vc_priv == EPecma) {
2335 if (vc->vc_par[0] == 5)
2336 status_report(tty);
2337 else if (vc->vc_par[0] == 6)
2338 cursor_report(vc, tty);
2339 }
2340 return;
2341 }
2342 if (vc->vc_priv != EPecma) {
2343 vc->vc_priv = EPecma;
2344 return;
2345 }
2346 switch(c) {
2347 case 'G': case '`':
2348 if (vc->vc_par[0])
2349 vc->vc_par[0]--;
2350 gotoxy(vc, vc->vc_par[0], vc->vc_y);
2351 return;
2352 case 'A':
2353 if (!vc->vc_par[0])
2354 vc->vc_par[0]++;
2355 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2356 return;
2357 case 'B': case 'e':
2358 if (!vc->vc_par[0])
2359 vc->vc_par[0]++;
2360 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2361 return;
2362 case 'C': case 'a':
2363 if (!vc->vc_par[0])
2364 vc->vc_par[0]++;
2365 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2366 return;
2367 case 'D':
2368 if (!vc->vc_par[0])
2369 vc->vc_par[0]++;
2370 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2371 return;
2372 case 'E':
2373 if (!vc->vc_par[0])
2374 vc->vc_par[0]++;
2375 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2376 return;
2377 case 'F':
2378 if (!vc->vc_par[0])
2379 vc->vc_par[0]++;
2380 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2381 return;
2382 case 'd':
2383 if (vc->vc_par[0])
2384 vc->vc_par[0]--;
2385 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2386 return;
2387 case 'H': case 'f':
2388 if (vc->vc_par[0])
2389 vc->vc_par[0]--;
2390 if (vc->vc_par[1])
2391 vc->vc_par[1]--;
2392 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2393 return;
2394 case 'J':
2395 csi_J(vc, vc->vc_par[0]);
2396 return;
2397 case 'K':
2398 csi_K(vc, vc->vc_par[0]);
2399 return;
2400 case 'L':
2401 csi_L(vc, vc->vc_par[0]);
2402 return;
2403 case 'M':
2404 csi_M(vc, vc->vc_par[0]);
2405 return;
2406 case 'P':
2407 csi_P(vc, vc->vc_par[0]);
2408 return;
2409 case 'c':
2410 if (!vc->vc_par[0])
2411 respond_ID(tty);
2412 return;
2413 case 'g':
2414 if (!vc->vc_par[0])
2415 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2416 else if (vc->vc_par[0] == 3) {
2417 vc->vc_tab_stop[0] =
2418 vc->vc_tab_stop[1] =
2419 vc->vc_tab_stop[2] =
2420 vc->vc_tab_stop[3] =
2421 vc->vc_tab_stop[4] =
2422 vc->vc_tab_stop[5] =
2423 vc->vc_tab_stop[6] =
2424 vc->vc_tab_stop[7] = 0;
2425 }
2426 return;
2427 case 'm':
2428 csi_m(vc);
2429 return;
2430 case 'q': /* DECLL - but only 3 leds */
2431 /* map 0,1,2,3 to 0,1,2,4 */
2432 if (vc->vc_par[0] < 4)
2433 vt_set_led_state(vc->vc_num,
2434 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2435 return;
2436 case 'r':
2437 if (!vc->vc_par[0])
2438 vc->vc_par[0]++;
2439 if (!vc->vc_par[1])
2440 vc->vc_par[1] = vc->vc_rows;
2441 /* Minimum allowed region is 2 lines */
2442 if (vc->vc_par[0] < vc->vc_par[1] &&
2443 vc->vc_par[1] <= vc->vc_rows) {
2444 vc->vc_top = vc->vc_par[0] - 1;
2445 vc->vc_bottom = vc->vc_par[1];
2446 gotoxay(vc, 0, 0);
2447 }
2448 return;
2449 case 's':
2450 save_cur(vc);
2451 return;
2452 case 'u':
2453 restore_cur(vc);
2454 return;
2455 case 'X':
2456 csi_X(vc, vc->vc_par[0]);
2457 return;
2458 case '@':
2459 csi_at(vc, vc->vc_par[0]);
2460 return;
2461 case ']': /* setterm functions */
2462 setterm_command(vc);
2463 return;
2464 }
2465 return;
2466 case EScsiignore:
2467 if (c >= 20 && c <= 0x3f)
2468 return;
2469 vc->vc_state = ESnormal;
2470 return;
2471 case ESpercent:
2472 vc->vc_state = ESnormal;
2473 switch (c) {
2474 case '@': /* defined in ISO 2022 */
2475 vc->vc_utf = 0;
2476 return;
2477 case 'G': /* prelim official escape code */
2478 case '8': /* retained for compatibility */
2479 vc->vc_utf = 1;
2480 return;
2481 }
2482 return;
2483 case ESfunckey:
2484 vc->vc_state = ESnormal;
2485 return;
2486 case EShash:
2487 vc->vc_state = ESnormal;
2488 if (c == '8') {
2489 /* DEC screen alignment test. kludge :-) */
2490 vc->vc_video_erase_char =
2491 (vc->vc_video_erase_char & 0xff00) | 'E';
2492 csi_J(vc, 2);
2493 vc->vc_video_erase_char =
2494 (vc->vc_video_erase_char & 0xff00) | ' ';
2495 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2496 }
2497 return;
2498 case ESsetG0:
2499 if (c == '0')
2500 vc->vc_G0_charset = GRAF_MAP;
2501 else if (c == 'B')
2502 vc->vc_G0_charset = LAT1_MAP;
2503 else if (c == 'U')
2504 vc->vc_G0_charset = IBMPC_MAP;
2505 else if (c == 'K')
2506 vc->vc_G0_charset = USER_MAP;
2507 if (vc->vc_charset == 0)
2508 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2509 vc->vc_state = ESnormal;
2510 return;
2511 case ESsetG1:
2512 if (c == '0')
2513 vc->vc_G1_charset = GRAF_MAP;
2514 else if (c == 'B')
2515 vc->vc_G1_charset = LAT1_MAP;
2516 else if (c == 'U')
2517 vc->vc_G1_charset = IBMPC_MAP;
2518 else if (c == 'K')
2519 vc->vc_G1_charset = USER_MAP;
2520 if (vc->vc_charset == 1)
2521 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2522 vc->vc_state = ESnormal;
2523 return;
2524 case ESosc:
2525 return;
2526 default:
2527 vc->vc_state = ESnormal;
2528 }
2529 }
2530
2531 /* is_double_width() is based on the wcwidth() implementation by
2532 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2533 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2534 */
2535 struct interval {
2536 uint32_t first;
2537 uint32_t last;
2538 };
2539
2540 static int ucs_cmp(const void *key, const void *elt)
2541 {
2542 uint32_t ucs = *(uint32_t *)key;
2543 struct interval e = *(struct interval *) elt;
2544
2545 if (ucs > e.last)
2546 return 1;
2547 else if (ucs < e.first)
2548 return -1;
2549 return 0;
2550 }
2551
2552 static int is_double_width(uint32_t ucs)
2553 {
2554 static const struct interval double_width[] = {
2555 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2556 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2557 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2558 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2559 };
2560 if (ucs < double_width[0].first ||
2561 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2562 return 0;
2563
2564 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2565 sizeof(struct interval), ucs_cmp) != NULL;
2566 }
2567
2568 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2569 unsigned long draw_to, int *draw_x)
2570 {
2571 if (*draw_x < 0)
2572 return;
2573
2574 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2575 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2576 *draw_x = -1;
2577 }
2578
2579 /* acquires console_lock */
2580 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2581 {
2582 int c, next_c, tc, ok, n = 0, draw_x = -1;
2583 unsigned int currcons;
2584 unsigned long draw_from = 0, draw_to = 0;
2585 struct vc_data *vc;
2586 unsigned char vc_attr;
2587 struct vt_notifier_param param;
2588 uint8_t rescan;
2589 uint8_t inverse;
2590 uint8_t width;
2591 u16 himask, charmask;
2592
2593 if (in_interrupt())
2594 return count;
2595
2596 console_lock();
2597 vc = tty->driver_data;
2598 if (vc == NULL) {
2599 pr_err("vt: argh, driver_data is NULL !\n");
2600 console_unlock();
2601 return 0;
2602 }
2603
2604 currcons = vc->vc_num;
2605 if (!vc_cons_allocated(currcons)) {
2606 /* could this happen? */
2607 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2608 console_unlock();
2609 return 0;
2610 }
2611
2612 himask = vc->vc_hi_font_mask;
2613 charmask = himask ? 0x1ff : 0xff;
2614
2615 /* undraw cursor first */
2616 if (con_is_fg(vc))
2617 hide_cursor(vc);
2618
2619 param.vc = vc;
2620
2621 while (!tty->stopped && count) {
2622 int orig = *buf;
2623 c = orig;
2624 buf++;
2625 n++;
2626 count--;
2627 rescan = 0;
2628 inverse = 0;
2629 width = 1;
2630
2631 /* Do no translation at all in control states */
2632 if (vc->vc_state != ESnormal) {
2633 tc = c;
2634 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2635 /* Combine UTF-8 into Unicode in vc_utf_char.
2636 * vc_utf_count is the number of continuation bytes still
2637 * expected to arrive.
2638 * vc_npar is the number of continuation bytes arrived so
2639 * far
2640 */
2641 rescan_last_byte:
2642 if ((c & 0xc0) == 0x80) {
2643 /* Continuation byte received */
2644 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2645 if (vc->vc_utf_count) {
2646 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2647 vc->vc_npar++;
2648 if (--vc->vc_utf_count) {
2649 /* Still need some bytes */
2650 continue;
2651 }
2652 /* Got a whole character */
2653 c = vc->vc_utf_char;
2654 /* Reject overlong sequences */
2655 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2656 c > utf8_length_changes[vc->vc_npar])
2657 c = 0xfffd;
2658 } else {
2659 /* Unexpected continuation byte */
2660 vc->vc_utf_count = 0;
2661 c = 0xfffd;
2662 }
2663 } else {
2664 /* Single ASCII byte or first byte of a sequence received */
2665 if (vc->vc_utf_count) {
2666 /* Continuation byte expected */
2667 rescan = 1;
2668 vc->vc_utf_count = 0;
2669 c = 0xfffd;
2670 } else if (c > 0x7f) {
2671 /* First byte of a multibyte sequence received */
2672 vc->vc_npar = 0;
2673 if ((c & 0xe0) == 0xc0) {
2674 vc->vc_utf_count = 1;
2675 vc->vc_utf_char = (c & 0x1f);
2676 } else if ((c & 0xf0) == 0xe0) {
2677 vc->vc_utf_count = 2;
2678 vc->vc_utf_char = (c & 0x0f);
2679 } else if ((c & 0xf8) == 0xf0) {
2680 vc->vc_utf_count = 3;
2681 vc->vc_utf_char = (c & 0x07);
2682 } else if ((c & 0xfc) == 0xf8) {
2683 vc->vc_utf_count = 4;
2684 vc->vc_utf_char = (c & 0x03);
2685 } else if ((c & 0xfe) == 0xfc) {
2686 vc->vc_utf_count = 5;
2687 vc->vc_utf_char = (c & 0x01);
2688 } else {
2689 /* 254 and 255 are invalid */
2690 c = 0xfffd;
2691 }
2692 if (vc->vc_utf_count) {
2693 /* Still need some bytes */
2694 continue;
2695 }
2696 }
2697 /* Nothing to do if an ASCII byte was received */
2698 }
2699 /* End of UTF-8 decoding. */
2700 /* c is the received character, or U+FFFD for invalid sequences. */
2701 /* Replace invalid Unicode code points with U+FFFD too */
2702 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2703 c = 0xfffd;
2704 tc = c;
2705 } else { /* no utf or alternate charset mode */
2706 tc = vc_translate(vc, c);
2707 }
2708
2709 param.c = tc;
2710 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2711 &param) == NOTIFY_STOP)
2712 continue;
2713
2714 /* If the original code was a control character we
2715 * only allow a glyph to be displayed if the code is
2716 * not normally used (such as for cursor movement) or
2717 * if the disp_ctrl mode has been explicitly enabled.
2718 * Certain characters (as given by the CTRL_ALWAYS
2719 * bitmap) are always displayed as control characters,
2720 * as the console would be pretty useless without
2721 * them; to display an arbitrary font position use the
2722 * direct-to-font zone in UTF-8 mode.
2723 */
2724 ok = tc && (c >= 32 ||
2725 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2726 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2727 && (c != 127 || vc->vc_disp_ctrl)
2728 && (c != 128+27);
2729
2730 if (vc->vc_state == ESnormal && ok) {
2731 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2732 if (is_double_width(c))
2733 width = 2;
2734 }
2735 /* Now try to find out how to display it */
2736 tc = conv_uni_to_pc(vc, tc);
2737 if (tc & ~charmask) {
2738 if (tc == -1 || tc == -2) {
2739 continue; /* nothing to display */
2740 }
2741 /* Glyph not found */
2742 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2743 /* In legacy mode use the glyph we get by a 1:1 mapping.
2744 This would make absolutely no sense with Unicode in mind,
2745 but do this for ASCII characters since a font may lack
2746 Unicode mapping info and we don't want to end up with
2747 having question marks only. */
2748 tc = c;
2749 } else {
2750 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2751 tc = conv_uni_to_pc(vc, 0xfffd);
2752 if (tc < 0) {
2753 inverse = 1;
2754 tc = conv_uni_to_pc(vc, '?');
2755 if (tc < 0) tc = '?';
2756 }
2757 }
2758 }
2759
2760 if (!inverse) {
2761 vc_attr = vc->vc_attr;
2762 } else {
2763 /* invert vc_attr */
2764 if (!vc->vc_can_do_color) {
2765 vc_attr = (vc->vc_attr) ^ 0x08;
2766 } else if (vc->vc_hi_font_mask == 0x100) {
2767 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2768 } else {
2769 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2770 }
2771 con_flush(vc, draw_from, draw_to, &draw_x);
2772 }
2773
2774 next_c = c;
2775 while (1) {
2776 if (vc->vc_need_wrap || vc->vc_decim)
2777 con_flush(vc, draw_from, draw_to,
2778 &draw_x);
2779 if (vc->vc_need_wrap) {
2780 cr(vc);
2781 lf(vc);
2782 }
2783 if (vc->vc_decim)
2784 insert_char(vc, 1);
2785 vc_uniscr_putc(vc, next_c);
2786 scr_writew(himask ?
2787 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2788 (vc_attr << 8) + tc,
2789 (u16 *) vc->vc_pos);
2790 if (con_should_update(vc) && draw_x < 0) {
2791 draw_x = vc->vc_x;
2792 draw_from = vc->vc_pos;
2793 }
2794 if (vc->vc_x == vc->vc_cols - 1) {
2795 vc->vc_need_wrap = vc->vc_decawm;
2796 draw_to = vc->vc_pos + 2;
2797 } else {
2798 vc->vc_x++;
2799 draw_to = (vc->vc_pos += 2);
2800 }
2801
2802 if (!--width) break;
2803
2804 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2805 if (tc < 0) tc = ' ';
2806 next_c = ' ';
2807 }
2808 notify_write(vc, c);
2809
2810 if (inverse)
2811 con_flush(vc, draw_from, draw_to, &draw_x);
2812
2813 if (rescan) {
2814 rescan = 0;
2815 inverse = 0;
2816 width = 1;
2817 c = orig;
2818 goto rescan_last_byte;
2819 }
2820 continue;
2821 }
2822 con_flush(vc, draw_from, draw_to, &draw_x);
2823 do_con_trol(tty, vc, orig);
2824 }
2825 con_flush(vc, draw_from, draw_to, &draw_x);
2826 vc_uniscr_debug_check(vc);
2827 console_conditional_schedule();
2828 notify_update(vc);
2829 console_unlock();
2830 return n;
2831 }
2832
2833 /*
2834 * This is the console switching callback.
2835 *
2836 * Doing console switching in a process context allows
2837 * us to do the switches asynchronously (needed when we want
2838 * to switch due to a keyboard interrupt). Synchronization
2839 * with other console code and prevention of re-entrancy is
2840 * ensured with console_lock.
2841 */
2842 static void console_callback(struct work_struct *ignored)
2843 {
2844 console_lock();
2845
2846 if (want_console >= 0) {
2847 if (want_console != fg_console &&
2848 vc_cons_allocated(want_console)) {
2849 hide_cursor(vc_cons[fg_console].d);
2850 change_console(vc_cons[want_console].d);
2851 /* we only changed when the console had already
2852 been allocated - a new console is not created
2853 in an interrupt routine */
2854 }
2855 want_console = -1;
2856 }
2857 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2858 do_poke_blanked_console = 0;
2859 poke_blanked_console();
2860 }
2861 if (scrollback_delta) {
2862 struct vc_data *vc = vc_cons[fg_console].d;
2863 clear_selection();
2864 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2865 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2866 scrollback_delta = 0;
2867 }
2868 if (blank_timer_expired) {
2869 do_blank_screen(0);
2870 blank_timer_expired = 0;
2871 }
2872 notify_update(vc_cons[fg_console].d);
2873
2874 console_unlock();
2875 }
2876
2877 int set_console(int nr)
2878 {
2879 struct vc_data *vc = vc_cons[fg_console].d;
2880
2881 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2882 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2883
2884 /*
2885 * Console switch will fail in console_callback() or
2886 * change_console() so there is no point scheduling
2887 * the callback
2888 *
2889 * Existing set_console() users don't check the return
2890 * value so this shouldn't break anything
2891 */
2892 return -EINVAL;
2893 }
2894
2895 want_console = nr;
2896 schedule_console_callback();
2897
2898 return 0;
2899 }
2900
2901 struct tty_driver *console_driver;
2902
2903 #ifdef CONFIG_VT_CONSOLE
2904
2905 /**
2906 * vt_kmsg_redirect() - Sets/gets the kernel message console
2907 * @new: The new virtual terminal number or -1 if the console should stay
2908 * unchanged
2909 *
2910 * By default, the kernel messages are always printed on the current virtual
2911 * console. However, the user may modify that default with the
2912 * TIOCL_SETKMSGREDIRECT ioctl call.
2913 *
2914 * This function sets the kernel message console to be @new. It returns the old
2915 * virtual console number. The virtual terminal number 0 (both as parameter and
2916 * return value) means no redirection (i.e. always printed on the currently
2917 * active console).
2918 *
2919 * The parameter -1 means that only the current console is returned, but the
2920 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2921 * case to make the code more understandable.
2922 *
2923 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2924 * the parameter and always returns 0.
2925 */
2926 int vt_kmsg_redirect(int new)
2927 {
2928 static int kmsg_con;
2929
2930 if (new != -1)
2931 return xchg(&kmsg_con, new);
2932 else
2933 return kmsg_con;
2934 }
2935
2936 /*
2937 * Console on virtual terminal
2938 *
2939 * The console must be locked when we get here.
2940 */
2941
2942 static void vt_console_print(struct console *co, const char *b, unsigned count)
2943 {
2944 struct vc_data *vc = vc_cons[fg_console].d;
2945 unsigned char c;
2946 static DEFINE_SPINLOCK(printing_lock);
2947 const ushort *start;
2948 ushort start_x, cnt;
2949 int kmsg_console;
2950
2951 /* console busy or not yet initialized */
2952 if (!printable)
2953 return;
2954 if (!spin_trylock(&printing_lock))
2955 return;
2956
2957 kmsg_console = vt_get_kmsg_redirect();
2958 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2959 vc = vc_cons[kmsg_console - 1].d;
2960
2961 if (!vc_cons_allocated(fg_console)) {
2962 /* impossible */
2963 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2964 goto quit;
2965 }
2966
2967 if (vc->vc_mode != KD_TEXT)
2968 goto quit;
2969
2970 /* undraw cursor first */
2971 if (con_is_fg(vc))
2972 hide_cursor(vc);
2973
2974 start = (ushort *)vc->vc_pos;
2975 start_x = vc->vc_x;
2976 cnt = 0;
2977 while (count--) {
2978 c = *b++;
2979 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2980 if (cnt && con_is_visible(vc))
2981 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2982 cnt = 0;
2983 if (c == 8) { /* backspace */
2984 bs(vc);
2985 start = (ushort *)vc->vc_pos;
2986 start_x = vc->vc_x;
2987 continue;
2988 }
2989 if (c != 13)
2990 lf(vc);
2991 cr(vc);
2992 start = (ushort *)vc->vc_pos;
2993 start_x = vc->vc_x;
2994 if (c == 10 || c == 13)
2995 continue;
2996 }
2997 vc_uniscr_putc(vc, c);
2998 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2999 notify_write(vc, c);
3000 cnt++;
3001 if (vc->vc_x == vc->vc_cols - 1) {
3002 vc->vc_need_wrap = 1;
3003 } else {
3004 vc->vc_pos += 2;
3005 vc->vc_x++;
3006 }
3007 }
3008 if (cnt && con_is_visible(vc))
3009 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
3010 set_cursor(vc);
3011 notify_update(vc);
3012
3013 quit:
3014 spin_unlock(&printing_lock);
3015 }
3016
3017 static struct tty_driver *vt_console_device(struct console *c, int *index)
3018 {
3019 *index = c->index ? c->index-1 : fg_console;
3020 return console_driver;
3021 }
3022
3023 static struct console vt_console_driver = {
3024 .name = "tty",
3025 .write = vt_console_print,
3026 .device = vt_console_device,
3027 .unblank = unblank_screen,
3028 .flags = CON_PRINTBUFFER,
3029 .index = -1,
3030 };
3031 #endif
3032
3033 /*
3034 * Handling of Linux-specific VC ioctls
3035 */
3036
3037 /*
3038 * Generally a bit racy with respect to console_lock();.
3039 *
3040 * There are some functions which don't need it.
3041 *
3042 * There are some functions which can sleep for arbitrary periods
3043 * (paste_selection) but we don't need the lock there anyway.
3044 *
3045 * set_selection_user has locking, and definitely needs it
3046 */
3047
3048 int tioclinux(struct tty_struct *tty, unsigned long arg)
3049 {
3050 char type, data;
3051 char __user *p = (char __user *)arg;
3052 int lines;
3053 int ret;
3054
3055 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3056 return -EPERM;
3057 if (get_user(type, p))
3058 return -EFAULT;
3059 ret = 0;
3060
3061 switch (type)
3062 {
3063 case TIOCL_SETSEL:
3064 ret = set_selection_user((struct tiocl_selection
3065 __user *)(p+1), tty);
3066 break;
3067 case TIOCL_PASTESEL:
3068 ret = paste_selection(tty);
3069 break;
3070 case TIOCL_UNBLANKSCREEN:
3071 console_lock();
3072 unblank_screen();
3073 console_unlock();
3074 break;
3075 case TIOCL_SELLOADLUT:
3076 console_lock();
3077 ret = sel_loadlut(p);
3078 console_unlock();
3079 break;
3080 case TIOCL_GETSHIFTSTATE:
3081
3082 /*
3083 * Make it possible to react to Shift+Mousebutton.
3084 * Note that 'shift_state' is an undocumented
3085 * kernel-internal variable; programs not closely
3086 * related to the kernel should not use this.
3087 */
3088 data = vt_get_shift_state();
3089 ret = put_user(data, p);
3090 break;
3091 case TIOCL_GETMOUSEREPORTING:
3092 console_lock(); /* May be overkill */
3093 data = mouse_reporting();
3094 console_unlock();
3095 ret = put_user(data, p);
3096 break;
3097 case TIOCL_SETVESABLANK:
3098 console_lock();
3099 ret = set_vesa_blanking(p);
3100 console_unlock();
3101 break;
3102 case TIOCL_GETKMSGREDIRECT:
3103 data = vt_get_kmsg_redirect();
3104 ret = put_user(data, p);
3105 break;
3106 case TIOCL_SETKMSGREDIRECT:
3107 if (!capable(CAP_SYS_ADMIN)) {
3108 ret = -EPERM;
3109 } else {
3110 if (get_user(data, p+1))
3111 ret = -EFAULT;
3112 else
3113 vt_kmsg_redirect(data);
3114 }
3115 break;
3116 case TIOCL_GETFGCONSOLE:
3117 /* No locking needed as this is a transiently
3118 correct return anyway if the caller hasn't
3119 disabled switching */
3120 ret = fg_console;
3121 break;
3122 case TIOCL_SCROLLCONSOLE:
3123 if (get_user(lines, (s32 __user *)(p+4))) {
3124 ret = -EFAULT;
3125 } else {
3126 /* Need the console lock here. Note that lots
3127 of other calls need fixing before the lock
3128 is actually useful ! */
3129 console_lock();
3130 scrollfront(vc_cons[fg_console].d, lines);
3131 console_unlock();
3132 ret = 0;
3133 }
3134 break;
3135 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3136 console_lock();
3137 ignore_poke = 1;
3138 do_blank_screen(0);
3139 console_unlock();
3140 break;
3141 case TIOCL_BLANKEDSCREEN:
3142 ret = console_blanked;
3143 break;
3144 default:
3145 ret = -EINVAL;
3146 break;
3147 }
3148 return ret;
3149 }
3150
3151 /*
3152 * /dev/ttyN handling
3153 */
3154
3155 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3156 {
3157 int retval;
3158
3159 retval = do_con_write(tty, buf, count);
3160 con_flush_chars(tty);
3161
3162 return retval;
3163 }
3164
3165 static int con_put_char(struct tty_struct *tty, unsigned char ch)
3166 {
3167 if (in_interrupt())
3168 return 0; /* n_r3964 calls put_char() from interrupt context */
3169 return do_con_write(tty, &ch, 1);
3170 }
3171
3172 static int con_write_room(struct tty_struct *tty)
3173 {
3174 if (tty->stopped)
3175 return 0;
3176 return 32768; /* No limit, really; we're not buffering */
3177 }
3178
3179 static int con_chars_in_buffer(struct tty_struct *tty)
3180 {
3181 return 0; /* we're not buffering */
3182 }
3183
3184 /*
3185 * con_throttle and con_unthrottle are only used for
3186 * paste_selection(), which has to stuff in a large number of
3187 * characters...
3188 */
3189 static void con_throttle(struct tty_struct *tty)
3190 {
3191 }
3192
3193 static void con_unthrottle(struct tty_struct *tty)
3194 {
3195 struct vc_data *vc = tty->driver_data;
3196
3197 wake_up_interruptible(&vc->paste_wait);
3198 }
3199
3200 /*
3201 * Turn the Scroll-Lock LED on when the tty is stopped
3202 */
3203 static void con_stop(struct tty_struct *tty)
3204 {
3205 int console_num;
3206 if (!tty)
3207 return;
3208 console_num = tty->index;
3209 if (!vc_cons_allocated(console_num))
3210 return;
3211 vt_kbd_con_stop(console_num);
3212 }
3213
3214 /*
3215 * Turn the Scroll-Lock LED off when the console is started
3216 */
3217 static void con_start(struct tty_struct *tty)
3218 {
3219 int console_num;
3220 if (!tty)
3221 return;
3222 console_num = tty->index;
3223 if (!vc_cons_allocated(console_num))
3224 return;
3225 vt_kbd_con_start(console_num);
3226 }
3227
3228 static void con_flush_chars(struct tty_struct *tty)
3229 {
3230 struct vc_data *vc;
3231
3232 if (in_interrupt()) /* from flush_to_ldisc */
3233 return;
3234
3235 /* if we race with con_close(), vt may be null */
3236 console_lock();
3237 vc = tty->driver_data;
3238 if (vc)
3239 set_cursor(vc);
3240 console_unlock();
3241 }
3242
3243 /*
3244 * Allocate the console screen memory.
3245 */
3246 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3247 {
3248 unsigned int currcons = tty->index;
3249 struct vc_data *vc;
3250 int ret;
3251
3252 console_lock();
3253 ret = vc_allocate(currcons);
3254 if (ret)
3255 goto unlock;
3256
3257 vc = vc_cons[currcons].d;
3258
3259 /* Still being freed */
3260 if (vc->port.tty) {
3261 ret = -ERESTARTSYS;
3262 goto unlock;
3263 }
3264
3265 ret = tty_port_install(&vc->port, driver, tty);
3266 if (ret)
3267 goto unlock;
3268
3269 tty->driver_data = vc;
3270 vc->port.tty = tty;
3271 tty_port_get(&vc->port);
3272
3273 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3274 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3275 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3276 }
3277 if (vc->vc_utf)
3278 tty->termios.c_iflag |= IUTF8;
3279 else
3280 tty->termios.c_iflag &= ~IUTF8;
3281 unlock:
3282 console_unlock();
3283 return ret;
3284 }
3285
3286 static int con_open(struct tty_struct *tty, struct file *filp)
3287 {
3288 /* everything done in install */
3289 return 0;
3290 }
3291
3292
3293 static void con_close(struct tty_struct *tty, struct file *filp)
3294 {
3295 /* Nothing to do - we defer to shutdown */
3296 }
3297
3298 static void con_shutdown(struct tty_struct *tty)
3299 {
3300 struct vc_data *vc = tty->driver_data;
3301 BUG_ON(vc == NULL);
3302 console_lock();
3303 vc->port.tty = NULL;
3304 console_unlock();
3305 }
3306
3307 static void con_cleanup(struct tty_struct *tty)
3308 {
3309 struct vc_data *vc = tty->driver_data;
3310
3311 tty_port_put(&vc->port);
3312 }
3313
3314 static int default_color = 7; /* white */
3315 static int default_italic_color = 2; // green (ASCII)
3316 static int default_underline_color = 3; // cyan (ASCII)
3317 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3318 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3319 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3320
3321 static void vc_init(struct vc_data *vc, unsigned int rows,
3322 unsigned int cols, int do_clear)
3323 {
3324 int j, k ;
3325
3326 vc->vc_cols = cols;
3327 vc->vc_rows = rows;
3328 vc->vc_size_row = cols << 1;
3329 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3330
3331 set_origin(vc);
3332 vc->vc_pos = vc->vc_origin;
3333 reset_vc(vc);
3334 for (j=k=0; j<16; j++) {
3335 vc->vc_palette[k++] = default_red[j] ;
3336 vc->vc_palette[k++] = default_grn[j] ;
3337 vc->vc_palette[k++] = default_blu[j] ;
3338 }
3339 vc->vc_def_color = default_color;
3340 vc->vc_ulcolor = default_underline_color;
3341 vc->vc_itcolor = default_italic_color;
3342 vc->vc_halfcolor = 0x08; /* grey */
3343 init_waitqueue_head(&vc->paste_wait);
3344 reset_terminal(vc, do_clear);
3345 }
3346
3347 /*
3348 * This routine initializes console interrupts, and does nothing
3349 * else. If you want the screen to clear, call tty_write with
3350 * the appropriate escape-sequence.
3351 */
3352
3353 static int __init con_init(void)
3354 {
3355 const char *display_desc = NULL;
3356 struct vc_data *vc;
3357 unsigned int currcons = 0, i;
3358
3359 console_lock();
3360
3361 if (!conswitchp)
3362 conswitchp = &dummy_con;
3363 display_desc = conswitchp->con_startup();
3364 if (!display_desc) {
3365 fg_console = 0;
3366 console_unlock();
3367 return 0;
3368 }
3369
3370 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3371 struct con_driver *con_driver = &registered_con_driver[i];
3372
3373 if (con_driver->con == NULL) {
3374 con_driver->con = conswitchp;
3375 con_driver->desc = display_desc;
3376 con_driver->flag = CON_DRIVER_FLAG_INIT;
3377 con_driver->first = 0;
3378 con_driver->last = MAX_NR_CONSOLES - 1;
3379 break;
3380 }
3381 }
3382
3383 for (i = 0; i < MAX_NR_CONSOLES; i++)
3384 con_driver_map[i] = conswitchp;
3385
3386 if (blankinterval) {
3387 blank_state = blank_normal_wait;
3388 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3389 }
3390
3391 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3392 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3393 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3394 tty_port_init(&vc->port);
3395 visual_init(vc, currcons, 1);
3396 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3397 vc_init(vc, vc->vc_rows, vc->vc_cols,
3398 currcons || !vc->vc_sw->con_save_screen);
3399 }
3400 currcons = fg_console = 0;
3401 master_display_fg = vc = vc_cons[currcons].d;
3402 set_origin(vc);
3403 save_screen(vc);
3404 gotoxy(vc, vc->vc_x, vc->vc_y);
3405 csi_J(vc, 0);
3406 update_screen(vc);
3407 pr_info("Console: %s %s %dx%d\n",
3408 vc->vc_can_do_color ? "colour" : "mono",
3409 display_desc, vc->vc_cols, vc->vc_rows);
3410 printable = 1;
3411
3412 console_unlock();
3413
3414 #ifdef CONFIG_VT_CONSOLE
3415 register_console(&vt_console_driver);
3416 #endif
3417 return 0;
3418 }
3419 console_initcall(con_init);
3420
3421 static const struct tty_operations con_ops = {
3422 .install = con_install,
3423 .open = con_open,
3424 .close = con_close,
3425 .write = con_write,
3426 .write_room = con_write_room,
3427 .put_char = con_put_char,
3428 .flush_chars = con_flush_chars,
3429 .chars_in_buffer = con_chars_in_buffer,
3430 .ioctl = vt_ioctl,
3431 #ifdef CONFIG_COMPAT
3432 .compat_ioctl = vt_compat_ioctl,
3433 #endif
3434 .stop = con_stop,
3435 .start = con_start,
3436 .throttle = con_throttle,
3437 .unthrottle = con_unthrottle,
3438 .resize = vt_resize,
3439 .shutdown = con_shutdown,
3440 .cleanup = con_cleanup,
3441 };
3442
3443 static struct cdev vc0_cdev;
3444
3445 static ssize_t show_tty_active(struct device *dev,
3446 struct device_attribute *attr, char *buf)
3447 {
3448 return sprintf(buf, "tty%d\n", fg_console + 1);
3449 }
3450 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3451
3452 static struct attribute *vt_dev_attrs[] = {
3453 &dev_attr_active.attr,
3454 NULL
3455 };
3456
3457 ATTRIBUTE_GROUPS(vt_dev);
3458
3459 int __init vty_init(const struct file_operations *console_fops)
3460 {
3461 cdev_init(&vc0_cdev, console_fops);
3462 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3463 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3464 panic("Couldn't register /dev/tty0 driver\n");
3465 tty0dev = device_create_with_groups(tty_class, NULL,
3466 MKDEV(TTY_MAJOR, 0), NULL,
3467 vt_dev_groups, "tty0");
3468 if (IS_ERR(tty0dev))
3469 tty0dev = NULL;
3470
3471 vcs_init();
3472
3473 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3474 if (!console_driver)
3475 panic("Couldn't allocate console driver\n");
3476
3477 console_driver->name = "tty";
3478 console_driver->name_base = 1;
3479 console_driver->major = TTY_MAJOR;
3480 console_driver->minor_start = 1;
3481 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3482 console_driver->init_termios = tty_std_termios;
3483 if (default_utf8)
3484 console_driver->init_termios.c_iflag |= IUTF8;
3485 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3486 tty_set_operations(console_driver, &con_ops);
3487 if (tty_register_driver(console_driver))
3488 panic("Couldn't register console driver\n");
3489 kbd_init();
3490 console_map_init();
3491 #ifdef CONFIG_MDA_CONSOLE
3492 mda_console_init();
3493 #endif
3494 return 0;
3495 }
3496
3497 #ifndef VT_SINGLE_DRIVER
3498
3499 static struct class *vtconsole_class;
3500
3501 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3502 int deflt)
3503 {
3504 struct module *owner = csw->owner;
3505 const char *desc = NULL;
3506 struct con_driver *con_driver;
3507 int i, j = -1, k = -1, retval = -ENODEV;
3508
3509 if (!try_module_get(owner))
3510 return -ENODEV;
3511
3512 WARN_CONSOLE_UNLOCKED();
3513
3514 /* check if driver is registered */
3515 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3516 con_driver = &registered_con_driver[i];
3517
3518 if (con_driver->con == csw) {
3519 desc = con_driver->desc;
3520 retval = 0;
3521 break;
3522 }
3523 }
3524
3525 if (retval)
3526 goto err;
3527
3528 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3529 csw->con_startup();
3530 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3531 }
3532
3533 if (deflt) {
3534 if (conswitchp)
3535 module_put(conswitchp->owner);
3536
3537 __module_get(owner);
3538 conswitchp = csw;
3539 }
3540
3541 first = max(first, con_driver->first);
3542 last = min(last, con_driver->last);
3543
3544 for (i = first; i <= last; i++) {
3545 int old_was_color;
3546 struct vc_data *vc = vc_cons[i].d;
3547
3548 if (con_driver_map[i])
3549 module_put(con_driver_map[i]->owner);
3550 __module_get(owner);
3551 con_driver_map[i] = csw;
3552
3553 if (!vc || !vc->vc_sw)
3554 continue;
3555
3556 j = i;
3557
3558 if (con_is_visible(vc)) {
3559 k = i;
3560 save_screen(vc);
3561 }
3562
3563 old_was_color = vc->vc_can_do_color;
3564 vc->vc_sw->con_deinit(vc);
3565 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3566 visual_init(vc, i, 0);
3567 set_origin(vc);
3568 update_attr(vc);
3569
3570 /* If the console changed between mono <-> color, then
3571 * the attributes in the screenbuf will be wrong. The
3572 * following resets all attributes to something sane.
3573 */
3574 if (old_was_color != vc->vc_can_do_color)
3575 clear_buffer_attributes(vc);
3576 }
3577
3578 pr_info("Console: switching ");
3579 if (!deflt)
3580 pr_cont("consoles %d-%d ", first + 1, last + 1);
3581 if (j >= 0) {
3582 struct vc_data *vc = vc_cons[j].d;
3583
3584 pr_cont("to %s %s %dx%d\n",
3585 vc->vc_can_do_color ? "colour" : "mono",
3586 desc, vc->vc_cols, vc->vc_rows);
3587
3588 if (k >= 0) {
3589 vc = vc_cons[k].d;
3590 update_screen(vc);
3591 }
3592 } else {
3593 pr_cont("to %s\n", desc);
3594 }
3595
3596 retval = 0;
3597 err:
3598 module_put(owner);
3599 return retval;
3600 };
3601
3602
3603 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3604 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3605 {
3606 struct module *owner = csw->owner;
3607 const struct consw *defcsw = NULL;
3608 struct con_driver *con_driver = NULL, *con_back = NULL;
3609 int i, retval = -ENODEV;
3610
3611 if (!try_module_get(owner))
3612 return -ENODEV;
3613
3614 WARN_CONSOLE_UNLOCKED();
3615
3616 /* check if driver is registered and if it is unbindable */
3617 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3618 con_driver = &registered_con_driver[i];
3619
3620 if (con_driver->con == csw &&
3621 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3622 retval = 0;
3623 break;
3624 }
3625 }
3626
3627 if (retval)
3628 goto err;
3629
3630 retval = -ENODEV;
3631
3632 /* check if backup driver exists */
3633 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3634 con_back = &registered_con_driver[i];
3635
3636 if (con_back->con && con_back->con != csw) {
3637 defcsw = con_back->con;
3638 retval = 0;
3639 break;
3640 }
3641 }
3642
3643 if (retval)
3644 goto err;
3645
3646 if (!con_is_bound(csw))
3647 goto err;
3648
3649 first = max(first, con_driver->first);
3650 last = min(last, con_driver->last);
3651
3652 for (i = first; i <= last; i++) {
3653 if (con_driver_map[i] == csw) {
3654 module_put(csw->owner);
3655 con_driver_map[i] = NULL;
3656 }
3657 }
3658
3659 if (!con_is_bound(defcsw)) {
3660 const struct consw *defconsw = conswitchp;
3661
3662 defcsw->con_startup();
3663 con_back->flag |= CON_DRIVER_FLAG_INIT;
3664 /*
3665 * vgacon may change the default driver to point
3666 * to dummycon, we restore it here...
3667 */
3668 conswitchp = defconsw;
3669 }
3670
3671 if (!con_is_bound(csw))
3672 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3673
3674 /* ignore return value, binding should not fail */
3675 do_bind_con_driver(defcsw, first, last, deflt);
3676 err:
3677 module_put(owner);
3678 return retval;
3679
3680 }
3681 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3682
3683 static int vt_bind(struct con_driver *con)
3684 {
3685 const struct consw *defcsw = NULL, *csw = NULL;
3686 int i, more = 1, first = -1, last = -1, deflt = 0;
3687
3688 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3689 goto err;
3690
3691 csw = con->con;
3692
3693 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3694 struct con_driver *con = &registered_con_driver[i];
3695
3696 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3697 defcsw = con->con;
3698 break;
3699 }
3700 }
3701
3702 if (!defcsw)
3703 goto err;
3704
3705 while (more) {
3706 more = 0;
3707
3708 for (i = con->first; i <= con->last; i++) {
3709 if (con_driver_map[i] == defcsw) {
3710 if (first == -1)
3711 first = i;
3712 last = i;
3713 more = 1;
3714 } else if (first != -1)
3715 break;
3716 }
3717
3718 if (first == 0 && last == MAX_NR_CONSOLES -1)
3719 deflt = 1;
3720
3721 if (first != -1)
3722 do_bind_con_driver(csw, first, last, deflt);
3723
3724 first = -1;
3725 last = -1;
3726 deflt = 0;
3727 }
3728
3729 err:
3730 return 0;
3731 }
3732
3733 static int vt_unbind(struct con_driver *con)
3734 {
3735 const struct consw *csw = NULL;
3736 int i, more = 1, first = -1, last = -1, deflt = 0;
3737 int ret;
3738
3739 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3740 goto err;
3741
3742 csw = con->con;
3743
3744 while (more) {
3745 more = 0;
3746
3747 for (i = con->first; i <= con->last; i++) {
3748 if (con_driver_map[i] == csw) {
3749 if (first == -1)
3750 first = i;
3751 last = i;
3752 more = 1;
3753 } else if (first != -1)
3754 break;
3755 }
3756
3757 if (first == 0 && last == MAX_NR_CONSOLES -1)
3758 deflt = 1;
3759
3760 if (first != -1) {
3761 ret = do_unbind_con_driver(csw, first, last, deflt);
3762 if (ret != 0)
3763 return ret;
3764 }
3765
3766 first = -1;
3767 last = -1;
3768 deflt = 0;
3769 }
3770
3771 err:
3772 return 0;
3773 }
3774 #else
3775 static inline int vt_bind(struct con_driver *con)
3776 {
3777 return 0;
3778 }
3779 static inline int vt_unbind(struct con_driver *con)
3780 {
3781 return 0;
3782 }
3783 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3784
3785 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3786 const char *buf, size_t count)
3787 {
3788 struct con_driver *con = dev_get_drvdata(dev);
3789 int bind = simple_strtoul(buf, NULL, 0);
3790
3791 console_lock();
3792
3793 if (bind)
3794 vt_bind(con);
3795 else
3796 vt_unbind(con);
3797
3798 console_unlock();
3799
3800 return count;
3801 }
3802
3803 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3804 char *buf)
3805 {
3806 struct con_driver *con = dev_get_drvdata(dev);
3807 int bind;
3808
3809 console_lock();
3810 bind = con_is_bound(con->con);
3811 console_unlock();
3812
3813 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3814 }
3815
3816 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3817 char *buf)
3818 {
3819 struct con_driver *con = dev_get_drvdata(dev);
3820
3821 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3822 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3823 con->desc);
3824
3825 }
3826
3827 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3828 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3829
3830 static struct attribute *con_dev_attrs[] = {
3831 &dev_attr_bind.attr,
3832 &dev_attr_name.attr,
3833 NULL
3834 };
3835
3836 ATTRIBUTE_GROUPS(con_dev);
3837
3838 static int vtconsole_init_device(struct con_driver *con)
3839 {
3840 con->flag |= CON_DRIVER_FLAG_ATTR;
3841 return 0;
3842 }
3843
3844 static void vtconsole_deinit_device(struct con_driver *con)
3845 {
3846 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3847 }
3848
3849 /**
3850 * con_is_bound - checks if driver is bound to the console
3851 * @csw: console driver
3852 *
3853 * RETURNS: zero if unbound, nonzero if bound
3854 *
3855 * Drivers can call this and if zero, they should release
3856 * all resources allocated on con_startup()
3857 */
3858 int con_is_bound(const struct consw *csw)
3859 {
3860 int i, bound = 0;
3861
3862 WARN_CONSOLE_UNLOCKED();
3863
3864 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3865 if (con_driver_map[i] == csw) {
3866 bound = 1;
3867 break;
3868 }
3869 }
3870
3871 return bound;
3872 }
3873 EXPORT_SYMBOL(con_is_bound);
3874
3875 /**
3876 * con_is_visible - checks whether the current console is visible
3877 * @vc: virtual console
3878 *
3879 * RETURNS: zero if not visible, nonzero if visible
3880 */
3881 bool con_is_visible(const struct vc_data *vc)
3882 {
3883 WARN_CONSOLE_UNLOCKED();
3884
3885 return *vc->vc_display_fg == vc;
3886 }
3887 EXPORT_SYMBOL(con_is_visible);
3888
3889 /**
3890 * con_debug_enter - prepare the console for the kernel debugger
3891 * @sw: console driver
3892 *
3893 * Called when the console is taken over by the kernel debugger, this
3894 * function needs to save the current console state, then put the console
3895 * into a state suitable for the kernel debugger.
3896 *
3897 * RETURNS:
3898 * Zero on success, nonzero if a failure occurred when trying to prepare
3899 * the console for the debugger.
3900 */
3901 int con_debug_enter(struct vc_data *vc)
3902 {
3903 int ret = 0;
3904
3905 saved_fg_console = fg_console;
3906 saved_last_console = last_console;
3907 saved_want_console = want_console;
3908 saved_vc_mode = vc->vc_mode;
3909 saved_console_blanked = console_blanked;
3910 vc->vc_mode = KD_TEXT;
3911 console_blanked = 0;
3912 if (vc->vc_sw->con_debug_enter)
3913 ret = vc->vc_sw->con_debug_enter(vc);
3914 #ifdef CONFIG_KGDB_KDB
3915 /* Set the initial LINES variable if it is not already set */
3916 if (vc->vc_rows < 999) {
3917 int linecount;
3918 char lns[4];
3919 const char *setargs[3] = {
3920 "set",
3921 "LINES",
3922 lns,
3923 };
3924 if (kdbgetintenv(setargs[0], &linecount)) {
3925 snprintf(lns, 4, "%i", vc->vc_rows);
3926 kdb_set(2, setargs);
3927 }
3928 }
3929 if (vc->vc_cols < 999) {
3930 int colcount;
3931 char cols[4];
3932 const char *setargs[3] = {
3933 "set",
3934 "COLUMNS",
3935 cols,
3936 };
3937 if (kdbgetintenv(setargs[0], &colcount)) {
3938 snprintf(cols, 4, "%i", vc->vc_cols);
3939 kdb_set(2, setargs);
3940 }
3941 }
3942 #endif /* CONFIG_KGDB_KDB */
3943 return ret;
3944 }
3945 EXPORT_SYMBOL_GPL(con_debug_enter);
3946
3947 /**
3948 * con_debug_leave - restore console state
3949 * @sw: console driver
3950 *
3951 * Restore the console state to what it was before the kernel debugger
3952 * was invoked.
3953 *
3954 * RETURNS:
3955 * Zero on success, nonzero if a failure occurred when trying to restore
3956 * the console.
3957 */
3958 int con_debug_leave(void)
3959 {
3960 struct vc_data *vc;
3961 int ret = 0;
3962
3963 fg_console = saved_fg_console;
3964 last_console = saved_last_console;
3965 want_console = saved_want_console;
3966 console_blanked = saved_console_blanked;
3967 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3968
3969 vc = vc_cons[fg_console].d;
3970 if (vc->vc_sw->con_debug_leave)
3971 ret = vc->vc_sw->con_debug_leave(vc);
3972 return ret;
3973 }
3974 EXPORT_SYMBOL_GPL(con_debug_leave);
3975
3976 static int do_register_con_driver(const struct consw *csw, int first, int last)
3977 {
3978 struct module *owner = csw->owner;
3979 struct con_driver *con_driver;
3980 const char *desc;
3981 int i, retval;
3982
3983 WARN_CONSOLE_UNLOCKED();
3984
3985 if (!try_module_get(owner))
3986 return -ENODEV;
3987
3988 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3989 con_driver = &registered_con_driver[i];
3990
3991 /* already registered */
3992 if (con_driver->con == csw) {
3993 retval = -EBUSY;
3994 goto err;
3995 }
3996 }
3997
3998 desc = csw->con_startup();
3999 if (!desc) {
4000 retval = -ENODEV;
4001 goto err;
4002 }
4003
4004 retval = -EINVAL;
4005
4006 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4007 con_driver = &registered_con_driver[i];
4008
4009 if (con_driver->con == NULL &&
4010 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4011 con_driver->con = csw;
4012 con_driver->desc = desc;
4013 con_driver->node = i;
4014 con_driver->flag = CON_DRIVER_FLAG_MODULE |
4015 CON_DRIVER_FLAG_INIT;
4016 con_driver->first = first;
4017 con_driver->last = last;
4018 retval = 0;
4019 break;
4020 }
4021 }
4022
4023 if (retval)
4024 goto err;
4025
4026 con_driver->dev =
4027 device_create_with_groups(vtconsole_class, NULL,
4028 MKDEV(0, con_driver->node),
4029 con_driver, con_dev_groups,
4030 "vtcon%i", con_driver->node);
4031 if (IS_ERR(con_driver->dev)) {
4032 pr_warn("Unable to create device for %s; errno = %ld\n",
4033 con_driver->desc, PTR_ERR(con_driver->dev));
4034 con_driver->dev = NULL;
4035 } else {
4036 vtconsole_init_device(con_driver);
4037 }
4038
4039 err:
4040 module_put(owner);
4041 return retval;
4042 }
4043
4044
4045 /**
4046 * do_unregister_con_driver - unregister console driver from console layer
4047 * @csw: console driver
4048 *
4049 * DESCRIPTION: All drivers that registers to the console layer must
4050 * call this function upon exit, or if the console driver is in a state
4051 * where it won't be able to handle console services, such as the
4052 * framebuffer console without loaded framebuffer drivers.
4053 *
4054 * The driver must unbind first prior to unregistration.
4055 */
4056 int do_unregister_con_driver(const struct consw *csw)
4057 {
4058 int i;
4059
4060 /* cannot unregister a bound driver */
4061 if (con_is_bound(csw))
4062 return -EBUSY;
4063
4064 if (csw == conswitchp)
4065 return -EINVAL;
4066
4067 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4068 struct con_driver *con_driver = &registered_con_driver[i];
4069
4070 if (con_driver->con == csw) {
4071 /*
4072 * Defer the removal of the sysfs entries since that
4073 * will acquire the kernfs s_active lock and we can't
4074 * acquire this lock while holding the console lock:
4075 * the unbind sysfs entry imposes already the opposite
4076 * order. Reset con already here to prevent any later
4077 * lookup to succeed and mark this slot as zombie, so
4078 * it won't get reused until we complete the removal
4079 * in the deferred work.
4080 */
4081 con_driver->con = NULL;
4082 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4083 schedule_work(&con_driver_unregister_work);
4084
4085 return 0;
4086 }
4087 }
4088
4089 return -ENODEV;
4090 }
4091 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4092
4093 static void con_driver_unregister_callback(struct work_struct *ignored)
4094 {
4095 int i;
4096
4097 console_lock();
4098
4099 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4100 struct con_driver *con_driver = &registered_con_driver[i];
4101
4102 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4103 continue;
4104
4105 console_unlock();
4106
4107 vtconsole_deinit_device(con_driver);
4108 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4109
4110 console_lock();
4111
4112 if (WARN_ON_ONCE(con_driver->con))
4113 con_driver->con = NULL;
4114 con_driver->desc = NULL;
4115 con_driver->dev = NULL;
4116 con_driver->node = 0;
4117 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4118 con_driver->flag = 0;
4119 con_driver->first = 0;
4120 con_driver->last = 0;
4121 }
4122
4123 console_unlock();
4124 }
4125
4126 /*
4127 * If we support more console drivers, this function is used
4128 * when a driver wants to take over some existing consoles
4129 * and become default driver for newly opened ones.
4130 *
4131 * do_take_over_console is basically a register followed by bind
4132 */
4133 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4134 {
4135 int err;
4136
4137 err = do_register_con_driver(csw, first, last);
4138 /*
4139 * If we get an busy error we still want to bind the console driver
4140 * and return success, as we may have unbound the console driver
4141 * but not unregistered it.
4142 */
4143 if (err == -EBUSY)
4144 err = 0;
4145 if (!err)
4146 do_bind_con_driver(csw, first, last, deflt);
4147
4148 return err;
4149 }
4150 EXPORT_SYMBOL_GPL(do_take_over_console);
4151
4152
4153 /*
4154 * give_up_console is a wrapper to unregister_con_driver. It will only
4155 * work if driver is fully unbound.
4156 */
4157 void give_up_console(const struct consw *csw)
4158 {
4159 console_lock();
4160 do_unregister_con_driver(csw);
4161 console_unlock();
4162 }
4163
4164 static int __init vtconsole_class_init(void)
4165 {
4166 int i;
4167
4168 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4169 if (IS_ERR(vtconsole_class)) {
4170 pr_warn("Unable to create vt console class; errno = %ld\n",
4171 PTR_ERR(vtconsole_class));
4172 vtconsole_class = NULL;
4173 }
4174
4175 /* Add system drivers to sysfs */
4176 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4177 struct con_driver *con = &registered_con_driver[i];
4178
4179 if (con->con && !con->dev) {
4180 con->dev =
4181 device_create_with_groups(vtconsole_class, NULL,
4182 MKDEV(0, con->node),
4183 con, con_dev_groups,
4184 "vtcon%i", con->node);
4185
4186 if (IS_ERR(con->dev)) {
4187 pr_warn("Unable to create device for %s; errno = %ld\n",
4188 con->desc, PTR_ERR(con->dev));
4189 con->dev = NULL;
4190 } else {
4191 vtconsole_init_device(con);
4192 }
4193 }
4194 }
4195
4196 return 0;
4197 }
4198 postcore_initcall(vtconsole_class_init);
4199
4200 #endif
4201
4202 /*
4203 * Screen blanking
4204 */
4205
4206 static int set_vesa_blanking(char __user *p)
4207 {
4208 unsigned int mode;
4209
4210 if (get_user(mode, p + 1))
4211 return -EFAULT;
4212
4213 vesa_blank_mode = (mode < 4) ? mode : 0;
4214 return 0;
4215 }
4216
4217 void do_blank_screen(int entering_gfx)
4218 {
4219 struct vc_data *vc = vc_cons[fg_console].d;
4220 int i;
4221
4222 might_sleep();
4223
4224 WARN_CONSOLE_UNLOCKED();
4225
4226 if (console_blanked) {
4227 if (blank_state == blank_vesa_wait) {
4228 blank_state = blank_off;
4229 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4230 }
4231 return;
4232 }
4233
4234 /* entering graphics mode? */
4235 if (entering_gfx) {
4236 hide_cursor(vc);
4237 save_screen(vc);
4238 vc->vc_sw->con_blank(vc, -1, 1);
4239 console_blanked = fg_console + 1;
4240 blank_state = blank_off;
4241 set_origin(vc);
4242 return;
4243 }
4244
4245 blank_state = blank_off;
4246
4247 /* don't blank graphics */
4248 if (vc->vc_mode != KD_TEXT) {
4249 console_blanked = fg_console + 1;
4250 return;
4251 }
4252
4253 hide_cursor(vc);
4254 del_timer_sync(&console_timer);
4255 blank_timer_expired = 0;
4256
4257 save_screen(vc);
4258 /* In case we need to reset origin, blanking hook returns 1 */
4259 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4260 console_blanked = fg_console + 1;
4261 if (i)
4262 set_origin(vc);
4263
4264 if (console_blank_hook && console_blank_hook(1))
4265 return;
4266
4267 if (vesa_off_interval && vesa_blank_mode) {
4268 blank_state = blank_vesa_wait;
4269 mod_timer(&console_timer, jiffies + vesa_off_interval);
4270 }
4271 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4272 }
4273 EXPORT_SYMBOL(do_blank_screen);
4274
4275 /*
4276 * Called by timer as well as from vt_console_driver
4277 */
4278 void do_unblank_screen(int leaving_gfx)
4279 {
4280 struct vc_data *vc;
4281
4282 /* This should now always be called from a "sane" (read: can schedule)
4283 * context for the sake of the low level drivers, except in the special
4284 * case of oops_in_progress
4285 */
4286 if (!oops_in_progress)
4287 might_sleep();
4288
4289 WARN_CONSOLE_UNLOCKED();
4290
4291 ignore_poke = 0;
4292 if (!console_blanked)
4293 return;
4294 if (!vc_cons_allocated(fg_console)) {
4295 /* impossible */
4296 pr_warn("unblank_screen: tty %d not allocated ??\n",
4297 fg_console + 1);
4298 return;
4299 }
4300 vc = vc_cons[fg_console].d;
4301 if (vc->vc_mode != KD_TEXT)
4302 return; /* but leave console_blanked != 0 */
4303
4304 if (blankinterval) {
4305 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4306 blank_state = blank_normal_wait;
4307 }
4308
4309 console_blanked = 0;
4310 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4311 /* Low-level driver cannot restore -> do it ourselves */
4312 update_screen(vc);
4313 if (console_blank_hook)
4314 console_blank_hook(0);
4315 set_palette(vc);
4316 set_cursor(vc);
4317 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4318 }
4319 EXPORT_SYMBOL(do_unblank_screen);
4320
4321 /*
4322 * This is called by the outside world to cause a forced unblank, mostly for
4323 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4324 * call it with 1 as an argument and so force a mode restore... that may kill
4325 * X or at least garbage the screen but would also make the Oops visible...
4326 */
4327 void unblank_screen(void)
4328 {
4329 do_unblank_screen(0);
4330 }
4331
4332 /*
4333 * We defer the timer blanking to work queue so it can take the console mutex
4334 * (console operations can still happen at irq time, but only from printk which
4335 * has the console mutex. Not perfect yet, but better than no locking
4336 */
4337 static void blank_screen_t(struct timer_list *unused)
4338 {
4339 blank_timer_expired = 1;
4340 schedule_work(&console_work);
4341 }
4342
4343 void poke_blanked_console(void)
4344 {
4345 WARN_CONSOLE_UNLOCKED();
4346
4347 /* Add this so we quickly catch whoever might call us in a non
4348 * safe context. Nowadays, unblank_screen() isn't to be called in
4349 * atomic contexts and is allowed to schedule (with the special case
4350 * of oops_in_progress, but that isn't of any concern for this
4351 * function. --BenH.
4352 */
4353 might_sleep();
4354
4355 /* This isn't perfectly race free, but a race here would be mostly harmless,
4356 * at worse, we'll do a spurrious blank and it's unlikely
4357 */
4358 del_timer(&console_timer);
4359 blank_timer_expired = 0;
4360
4361 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4362 return;
4363 if (console_blanked)
4364 unblank_screen();
4365 else if (blankinterval) {
4366 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4367 blank_state = blank_normal_wait;
4368 }
4369 }
4370
4371 /*
4372 * Palettes
4373 */
4374
4375 static void set_palette(struct vc_data *vc)
4376 {
4377 WARN_CONSOLE_UNLOCKED();
4378
4379 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4380 vc->vc_sw->con_set_palette(vc, color_table);
4381 }
4382
4383 /*
4384 * Load palette into the DAC registers. arg points to a colour
4385 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4386 */
4387
4388 int con_set_cmap(unsigned char __user *arg)
4389 {
4390 int i, j, k;
4391 unsigned char colormap[3*16];
4392
4393 if (copy_from_user(colormap, arg, sizeof(colormap)))
4394 return -EFAULT;
4395
4396 console_lock();
4397 for (i = k = 0; i < 16; i++) {
4398 default_red[i] = colormap[k++];
4399 default_grn[i] = colormap[k++];
4400 default_blu[i] = colormap[k++];
4401 }
4402 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4403 if (!vc_cons_allocated(i))
4404 continue;
4405 for (j = k = 0; j < 16; j++) {
4406 vc_cons[i].d->vc_palette[k++] = default_red[j];
4407 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4408 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4409 }
4410 set_palette(vc_cons[i].d);
4411 }
4412 console_unlock();
4413
4414 return 0;
4415 }
4416
4417 int con_get_cmap(unsigned char __user *arg)
4418 {
4419 int i, k;
4420 unsigned char colormap[3*16];
4421
4422 console_lock();
4423 for (i = k = 0; i < 16; i++) {
4424 colormap[k++] = default_red[i];
4425 colormap[k++] = default_grn[i];
4426 colormap[k++] = default_blu[i];
4427 }
4428 console_unlock();
4429
4430 if (copy_to_user(arg, colormap, sizeof(colormap)))
4431 return -EFAULT;
4432
4433 return 0;
4434 }
4435
4436 void reset_palette(struct vc_data *vc)
4437 {
4438 int j, k;
4439 for (j=k=0; j<16; j++) {
4440 vc->vc_palette[k++] = default_red[j];
4441 vc->vc_palette[k++] = default_grn[j];
4442 vc->vc_palette[k++] = default_blu[j];
4443 }
4444 set_palette(vc);
4445 }
4446
4447 /*
4448 * Font switching
4449 *
4450 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4451 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4452 * depending on width) reserved for each character which is kinda wasty, but
4453 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4454 * is up to the actual low-level console-driver convert data into its favorite
4455 * format (maybe we should add a `fontoffset' field to the `display'
4456 * structure so we won't have to convert the fontdata all the time.
4457 * /Jes
4458 */
4459
4460 #define max_font_size 65536
4461
4462 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4463 {
4464 struct console_font font;
4465 int rc = -EINVAL;
4466 int c;
4467
4468 if (op->data) {
4469 font.data = kmalloc(max_font_size, GFP_KERNEL);
4470 if (!font.data)
4471 return -ENOMEM;
4472 } else
4473 font.data = NULL;
4474
4475 console_lock();
4476 if (vc->vc_mode != KD_TEXT)
4477 rc = -EINVAL;
4478 else if (vc->vc_sw->con_font_get)
4479 rc = vc->vc_sw->con_font_get(vc, &font);
4480 else
4481 rc = -ENOSYS;
4482 console_unlock();
4483
4484 if (rc)
4485 goto out;
4486
4487 c = (font.width+7)/8 * 32 * font.charcount;
4488
4489 if (op->data && font.charcount > op->charcount)
4490 rc = -ENOSPC;
4491 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4492 if (font.width > op->width || font.height > op->height)
4493 rc = -ENOSPC;
4494 } else {
4495 if (font.width != 8)
4496 rc = -EIO;
4497 else if ((op->height && font.height > op->height) ||
4498 font.height > 32)
4499 rc = -ENOSPC;
4500 }
4501 if (rc)
4502 goto out;
4503
4504 op->height = font.height;
4505 op->width = font.width;
4506 op->charcount = font.charcount;
4507
4508 if (op->data && copy_to_user(op->data, font.data, c))
4509 rc = -EFAULT;
4510
4511 out:
4512 kfree(font.data);
4513 return rc;
4514 }
4515
4516 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4517 {
4518 struct console_font font;
4519 int rc = -EINVAL;
4520 int size;
4521
4522 if (vc->vc_mode != KD_TEXT)
4523 return -EINVAL;
4524 if (!op->data)
4525 return -EINVAL;
4526 if (op->charcount > 512)
4527 return -EINVAL;
4528 if (op->width <= 0 || op->width > 32 || op->height > 32)
4529 return -EINVAL;
4530 size = (op->width+7)/8 * 32 * op->charcount;
4531 if (size > max_font_size)
4532 return -ENOSPC;
4533
4534 font.data = memdup_user(op->data, size);
4535 if (IS_ERR(font.data))
4536 return PTR_ERR(font.data);
4537
4538 if (!op->height) { /* Need to guess font height [compat] */
4539 int h, i;
4540 u8 *charmap = font.data;
4541
4542 /*
4543 * If from KDFONTOP ioctl, don't allow things which can be done
4544 * in userland,so that we can get rid of this soon
4545 */
4546 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4547 kfree(font.data);
4548 return -EINVAL;
4549 }
4550
4551 for (h = 32; h > 0; h--)
4552 for (i = 0; i < op->charcount; i++)
4553 if (charmap[32*i+h-1])
4554 goto nonzero;
4555
4556 kfree(font.data);
4557 return -EINVAL;
4558
4559 nonzero:
4560 op->height = h;
4561 }
4562
4563 font.charcount = op->charcount;
4564 font.width = op->width;
4565 font.height = op->height;
4566
4567 console_lock();
4568 if (vc->vc_mode != KD_TEXT)
4569 rc = -EINVAL;
4570 else if (vc->vc_sw->con_font_set)
4571 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4572 else
4573 rc = -ENOSYS;
4574 console_unlock();
4575 kfree(font.data);
4576 return rc;
4577 }
4578
4579 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4580 {
4581 struct console_font font = {.width = op->width, .height = op->height};
4582 char name[MAX_FONT_NAME];
4583 char *s = name;
4584 int rc;
4585
4586
4587 if (!op->data)
4588 s = NULL;
4589 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4590 return -EFAULT;
4591 else
4592 name[MAX_FONT_NAME - 1] = 0;
4593
4594 console_lock();
4595 if (vc->vc_mode != KD_TEXT) {
4596 console_unlock();
4597 return -EINVAL;
4598 }
4599 if (vc->vc_sw->con_font_default)
4600 rc = vc->vc_sw->con_font_default(vc, &font, s);
4601 else
4602 rc = -ENOSYS;
4603 console_unlock();
4604 if (!rc) {
4605 op->width = font.width;
4606 op->height = font.height;
4607 }
4608 return rc;
4609 }
4610
4611 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4612 {
4613 int con = op->height;
4614 int rc;
4615
4616
4617 console_lock();
4618 if (vc->vc_mode != KD_TEXT)
4619 rc = -EINVAL;
4620 else if (!vc->vc_sw->con_font_copy)
4621 rc = -ENOSYS;
4622 else if (con < 0 || !vc_cons_allocated(con))
4623 rc = -ENOTTY;
4624 else if (con == vc->vc_num) /* nothing to do */
4625 rc = 0;
4626 else
4627 rc = vc->vc_sw->con_font_copy(vc, con);
4628 console_unlock();
4629 return rc;
4630 }
4631
4632 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4633 {
4634 switch (op->op) {
4635 case KD_FONT_OP_SET:
4636 return con_font_set(vc, op);
4637 case KD_FONT_OP_GET:
4638 return con_font_get(vc, op);
4639 case KD_FONT_OP_SET_DEFAULT:
4640 return con_font_default(vc, op);
4641 case KD_FONT_OP_COPY:
4642 return con_font_copy(vc, op);
4643 }
4644 return -ENOSYS;
4645 }
4646
4647 /*
4648 * Interface exported to selection and vcs.
4649 */
4650
4651 /* used by selection */
4652 u16 screen_glyph(struct vc_data *vc, int offset)
4653 {
4654 u16 w = scr_readw(screenpos(vc, offset, 1));
4655 u16 c = w & 0xff;
4656
4657 if (w & vc->vc_hi_font_mask)
4658 c |= 0x100;
4659 return c;
4660 }
4661 EXPORT_SYMBOL_GPL(screen_glyph);
4662
4663 u32 screen_glyph_unicode(struct vc_data *vc, int n)
4664 {
4665 struct uni_screen *uniscr = get_vc_uniscr(vc);
4666
4667 if (uniscr)
4668 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4669 return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4670 }
4671 EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4672
4673 /* used by vcs - note the word offset */
4674 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4675 {
4676 return screenpos(vc, 2 * w_offset, viewed);
4677 }
4678 EXPORT_SYMBOL_GPL(screen_pos);
4679
4680 void getconsxy(struct vc_data *vc, unsigned char *p)
4681 {
4682 /* clamp values if they don't fit */
4683 p[0] = min(vc->vc_x, 0xFFu);
4684 p[1] = min(vc->vc_y, 0xFFu);
4685 }
4686
4687 void putconsxy(struct vc_data *vc, unsigned char *p)
4688 {
4689 hide_cursor(vc);
4690 gotoxy(vc, p[0], p[1]);
4691 set_cursor(vc);
4692 }
4693
4694 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4695 {
4696 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4697 return softcursor_original;
4698 return scr_readw(org);
4699 }
4700
4701 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4702 {
4703 scr_writew(val, org);
4704 if ((unsigned long)org == vc->vc_pos) {
4705 softcursor_original = -1;
4706 add_softcursor(vc);
4707 }
4708 }
4709
4710 void vcs_scr_updated(struct vc_data *vc)
4711 {
4712 notify_update(vc);
4713 }
4714
4715 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4716 unsigned int rolled_over, void *base, unsigned int size)
4717 {
4718 unsigned long ubase = (unsigned long)base;
4719 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4720 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4721 ptrdiff_t origin = (void *)c->vc_origin - base;
4722 int margin = c->vc_size_row * 4;
4723 int from, wrap, from_off, avail;
4724
4725 /* Turn scrollback off */
4726 if (!lines) {
4727 c->vc_visible_origin = c->vc_origin;
4728 return;
4729 }
4730
4731 /* Do we have already enough to allow jumping from 0 to the end? */
4732 if (rolled_over > scr_end + margin) {
4733 from = scr_end;
4734 wrap = rolled_over + c->vc_size_row;
4735 } else {
4736 from = 0;
4737 wrap = size;
4738 }
4739
4740 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4741 avail = (origin - from + wrap) % wrap;
4742
4743 /* Only a little piece would be left? Show all incl. the piece! */
4744 if (avail < 2 * margin)
4745 margin = 0;
4746 if (from_off < margin)
4747 from_off = 0;
4748 if (from_off > avail - margin)
4749 from_off = avail;
4750
4751 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4752 }
4753 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4754
4755 /*
4756 * Visible symbols for modules
4757 */
4758
4759 EXPORT_SYMBOL(color_table);
4760 EXPORT_SYMBOL(default_red);
4761 EXPORT_SYMBOL(default_grn);
4762 EXPORT_SYMBOL(default_blu);
4763 EXPORT_SYMBOL(update_region);
4764 EXPORT_SYMBOL(redraw_screen);
4765 EXPORT_SYMBOL(vc_resize);
4766 EXPORT_SYMBOL(fg_console);
4767 EXPORT_SYMBOL(console_blank_hook);
4768 EXPORT_SYMBOL(console_blanked);
4769 EXPORT_SYMBOL(vc_cons);
4770 EXPORT_SYMBOL(global_cursor_default);
4771 #ifndef VT_SINGLE_DRIVER
4772 EXPORT_SYMBOL(give_up_console);
4773 #endif
Linux with added FPC-III support