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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / tty / vt / vt.c
blobd04a162939a4d527306bf7b1312306f1900184ef
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 /*
131 * Here is the default bell parameters: 750HZ, 1/8th of a second
132 */
133 #define DEFAULT_BELL_PITCH 750
134 #define DEFAULT_BELL_DURATION (HZ/8)
135 #define DEFAULT_CURSOR_BLINK_MS 200
136
137 struct vc vc_cons [MAX_NR_CONSOLES];
138
139 #ifndef VT_SINGLE_DRIVER
140 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
141 #endif
142
143 static int con_open(struct tty_struct *, struct file *);
144 static void vc_init(struct vc_data *vc, unsigned int rows,
145 unsigned int cols, int do_clear);
146 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
147 static void save_cur(struct vc_data *vc);
148 static void reset_terminal(struct vc_data *vc, int do_clear);
149 static void con_flush_chars(struct tty_struct *tty);
150 static int set_vesa_blanking(char __user *p);
151 static void set_cursor(struct vc_data *vc);
152 static void hide_cursor(struct vc_data *vc);
153 static void console_callback(struct work_struct *ignored);
154 static void con_driver_unregister_callback(struct work_struct *ignored);
155 static void blank_screen_t(struct timer_list *unused);
156 static void set_palette(struct vc_data *vc);
157
158 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
159
160 static int printable; /* Is console ready for printing? */
161 int default_utf8 = true;
162 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
163 int global_cursor_default = -1;
164 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
165
166 static int cur_default = CUR_UNDERLINE;
167 module_param(cur_default, int, S_IRUGO | S_IWUSR);
168
169 /*
170 * ignore_poke: don't unblank the screen when things are typed. This is
171 * mainly for the privacy of braille terminal users.
172 */
173 static int ignore_poke;
174
175 int do_poke_blanked_console;
176 int console_blanked;
177
178 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
179 static int vesa_off_interval;
180 static int blankinterval;
181 core_param(consoleblank, blankinterval, int, 0444);
182
183 static DECLARE_WORK(console_work, console_callback);
184 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
185
186 /*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
190 * saved_* variants are for save/restore around kernel debugger enter/leave
191 */
192 int fg_console;
193 int last_console;
194 int want_console = -1;
195 static int saved_fg_console;
196 static int saved_last_console;
197 static int saved_want_console;
198 static int saved_vc_mode;
199 static int saved_console_blanked;
200
201 /*
202 * For each existing display, we have a pointer to console currently visible
203 * on that display, allowing consoles other than fg_console to be refreshed
204 * appropriately. Unless the low-level driver supplies its own display_fg
205 * variable, we use this one for the "master display".
206 */
207 static struct vc_data *master_display_fg;
208
209 /*
210 * Unfortunately, we need to delay tty echo when we're currently writing to the
211 * console since the code is (and always was) not re-entrant, so we schedule
212 * all flip requests to process context with schedule-task() and run it from
213 * console_callback().
214 */
215
216 /*
217 * For the same reason, we defer scrollback to the console callback.
218 */
219 static int scrollback_delta;
220
221 /*
222 * Hook so that the power management routines can (un)blank
223 * the console on our behalf.
224 */
225 int (*console_blank_hook)(int);
226
227 static DEFINE_TIMER(console_timer, blank_screen_t);
228 static int blank_state;
229 static int blank_timer_expired;
230 enum {
231 blank_off = 0,
232 blank_normal_wait,
233 blank_vesa_wait,
234 };
235
236 /*
237 * /sys/class/tty/tty0/
238 *
239 * the attribute 'active' contains the name of the current vc
240 * console and it supports poll() to detect vc switches
241 */
242 static struct device *tty0dev;
243
244 /*
245 * Notifier list for console events.
246 */
247 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
248
249 int register_vt_notifier(struct notifier_block *nb)
250 {
251 return atomic_notifier_chain_register(&vt_notifier_list, nb);
252 }
253 EXPORT_SYMBOL_GPL(register_vt_notifier);
254
255 int unregister_vt_notifier(struct notifier_block *nb)
256 {
257 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
258 }
259 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
260
261 static void notify_write(struct vc_data *vc, unsigned int unicode)
262 {
263 struct vt_notifier_param param = { .vc = vc, .c = unicode };
264 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
265 }
266
267 static void notify_update(struct vc_data *vc)
268 {
269 struct vt_notifier_param param = { .vc = vc };
270 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
271 }
272 /*
273 * Low-Level Functions
274 */
275
276 static inline bool con_is_fg(const struct vc_data *vc)
277 {
278 return vc->vc_num == fg_console;
279 }
280
281 static inline bool con_should_update(const struct vc_data *vc)
282 {
283 return con_is_visible(vc) && !console_blanked;
284 }
285
286 static inline unsigned short *screenpos(const struct vc_data *vc, int offset,
287 bool viewed)
288 {
289 unsigned short *p;
290
291 if (!viewed)
292 p = (unsigned short *)(vc->vc_origin + offset);
293 else if (!vc->vc_sw->con_screen_pos)
294 p = (unsigned short *)(vc->vc_visible_origin + offset);
295 else
296 p = vc->vc_sw->con_screen_pos(vc, offset);
297 return p;
298 }
299
300 /* Called from the keyboard irq path.. */
301 static inline void scrolldelta(int lines)
302 {
303 /* FIXME */
304 /* scrolldelta needs some kind of consistency lock, but the BKL was
305 and still is not protecting versus the scheduled back end */
306 scrollback_delta += lines;
307 schedule_console_callback();
308 }
309
310 void schedule_console_callback(void)
311 {
312 schedule_work(&console_work);
313 }
314
315 /*
316 * Code to manage unicode-based screen buffers
317 */
318
319 #ifdef NO_VC_UNI_SCREEN
320 /* this disables and optimizes related code away at compile time */
321 #define get_vc_uniscr(vc) NULL
322 #else
323 #define get_vc_uniscr(vc) vc->vc_uni_screen
324 #endif
325
326 #define VC_UNI_SCREEN_DEBUG 0
327
328 typedef uint32_t char32_t;
329
330 /*
331 * Our screen buffer is preceded by an array of line pointers so that
332 * scrolling only implies some pointer shuffling.
333 */
334 struct uni_screen {
335 char32_t *lines[0];
336 };
337
338 static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
339 {
340 struct uni_screen *uniscr;
341 void *p;
342 unsigned int memsize, i;
343
344 /* allocate everything in one go */
345 memsize = cols * rows * sizeof(char32_t);
346 memsize += rows * sizeof(char32_t *);
347 p = vmalloc(memsize);
348 if (!p)
349 return NULL;
350
351 /* initial line pointers */
352 uniscr = p;
353 p = uniscr->lines + rows;
354 for (i = 0; i < rows; i++) {
355 uniscr->lines[i] = p;
356 p += cols * sizeof(char32_t);
357 }
358 return uniscr;
359 }
360
361 static void vc_uniscr_free(struct uni_screen *uniscr)
362 {
363 vfree(uniscr);
364 }
365
366 static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
367 {
368 vc_uniscr_free(vc->vc_uni_screen);
369 vc->vc_uni_screen = new_uniscr;
370 }
371
372 static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
373 {
374 struct uni_screen *uniscr = get_vc_uniscr(vc);
375
376 if (uniscr)
377 uniscr->lines[vc->state.y][vc->state.x] = uc;
378 }
379
380 static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
381 {
382 struct uni_screen *uniscr = get_vc_uniscr(vc);
383
384 if (uniscr) {
385 char32_t *ln = uniscr->lines[vc->state.y];
386 unsigned int x = vc->state.x, cols = vc->vc_cols;
387
388 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
389 memset32(&ln[x], ' ', nr);
390 }
391 }
392
393 static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
394 {
395 struct uni_screen *uniscr = get_vc_uniscr(vc);
396
397 if (uniscr) {
398 char32_t *ln = uniscr->lines[vc->state.y];
399 unsigned int x = vc->state.x, cols = vc->vc_cols;
400
401 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
402 memset32(&ln[cols - nr], ' ', nr);
403 }
404 }
405
406 static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
407 unsigned int nr)
408 {
409 struct uni_screen *uniscr = get_vc_uniscr(vc);
410
411 if (uniscr) {
412 char32_t *ln = uniscr->lines[vc->state.y];
413
414 memset32(&ln[x], ' ', nr);
415 }
416 }
417
418 static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
419 unsigned int nr)
420 {
421 struct uni_screen *uniscr = get_vc_uniscr(vc);
422
423 if (uniscr) {
424 unsigned int cols = vc->vc_cols;
425
426 while (nr--)
427 memset32(uniscr->lines[y++], ' ', cols);
428 }
429 }
430
431 static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
432 enum con_scroll dir, unsigned int nr)
433 {
434 struct uni_screen *uniscr = get_vc_uniscr(vc);
435
436 if (uniscr) {
437 unsigned int i, j, k, sz, d, clear;
438
439 sz = b - t;
440 clear = b - nr;
441 d = nr;
442 if (dir == SM_DOWN) {
443 clear = t;
444 d = sz - nr;
445 }
446 for (i = 0; i < gcd(d, sz); i++) {
447 char32_t *tmp = uniscr->lines[t + i];
448 j = i;
449 while (1) {
450 k = j + d;
451 if (k >= sz)
452 k -= sz;
453 if (k == i)
454 break;
455 uniscr->lines[t + j] = uniscr->lines[t + k];
456 j = k;
457 }
458 uniscr->lines[t + j] = tmp;
459 }
460 vc_uniscr_clear_lines(vc, clear, nr);
461 }
462 }
463
464 static void vc_uniscr_copy_area(struct uni_screen *dst,
465 unsigned int dst_cols,
466 unsigned int dst_rows,
467 struct uni_screen *src,
468 unsigned int src_cols,
469 unsigned int src_top_row,
470 unsigned int src_bot_row)
471 {
472 unsigned int dst_row = 0;
473
474 if (!dst)
475 return;
476
477 while (src_top_row < src_bot_row) {
478 char32_t *src_line = src->lines[src_top_row];
479 char32_t *dst_line = dst->lines[dst_row];
480
481 memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
482 if (dst_cols - src_cols)
483 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
484 src_top_row++;
485 dst_row++;
486 }
487 while (dst_row < dst_rows) {
488 char32_t *dst_line = dst->lines[dst_row];
489
490 memset32(dst_line, ' ', dst_cols);
491 dst_row++;
492 }
493 }
494
495 /*
496 * Called from vcs_read() to make sure unicode screen retrieval is possible.
497 * This will initialize the unicode screen buffer if not already done.
498 * This returns 0 if OK, or a negative error code otherwise.
499 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
500 */
501 int vc_uniscr_check(struct vc_data *vc)
502 {
503 struct uni_screen *uniscr;
504 unsigned short *p;
505 int x, y, mask;
506
507 if (__is_defined(NO_VC_UNI_SCREEN))
508 return -EOPNOTSUPP;
509
510 WARN_CONSOLE_UNLOCKED();
511
512 if (!vc->vc_utf)
513 return -ENODATA;
514
515 if (vc->vc_uni_screen)
516 return 0;
517
518 uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
519 if (!uniscr)
520 return -ENOMEM;
521
522 /*
523 * Let's populate it initially with (imperfect) reverse translation.
524 * This is the next best thing we can do short of having it enabled
525 * from the start even when no users rely on this functionality. True
526 * unicode content will be available after a complete screen refresh.
527 */
528 p = (unsigned short *)vc->vc_origin;
529 mask = vc->vc_hi_font_mask | 0xff;
530 for (y = 0; y < vc->vc_rows; y++) {
531 char32_t *line = uniscr->lines[y];
532 for (x = 0; x < vc->vc_cols; x++) {
533 u16 glyph = scr_readw(p++) & mask;
534 line[x] = inverse_translate(vc, glyph, true);
535 }
536 }
537
538 vc->vc_uni_screen = uniscr;
539 return 0;
540 }
541
542 /*
543 * Called from vcs_read() to get the unicode data from the screen.
544 * This must be preceded by a successful call to vc_uniscr_check() once
545 * the console lock has been taken.
546 */
547 void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
548 unsigned int row, unsigned int col, unsigned int nr)
549 {
550 struct uni_screen *uniscr = get_vc_uniscr(vc);
551 int offset = row * vc->vc_size_row + col * 2;
552 unsigned long pos;
553
554 BUG_ON(!uniscr);
555
556 pos = (unsigned long)screenpos(vc, offset, viewed);
557 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
558 /*
559 * Desired position falls in the main screen buffer.
560 * However the actual row/col might be different if
561 * scrollback is active.
562 */
563 row = (pos - vc->vc_origin) / vc->vc_size_row;
564 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
565 memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
566 } else {
567 /*
568 * Scrollback is active. For now let's simply backtranslate
569 * the screen glyphs until the unicode screen buffer does
570 * synchronize with console display drivers for a scrollback
571 * buffer of its own.
572 */
573 u16 *p = (u16 *)pos;
574 int mask = vc->vc_hi_font_mask | 0xff;
575 char32_t *uni_buf = dest;
576 while (nr--) {
577 u16 glyph = scr_readw(p++) & mask;
578 *uni_buf++ = inverse_translate(vc, glyph, true);
579 }
580 }
581 }
582
583 /* this is for validation and debugging only */
584 static void vc_uniscr_debug_check(struct vc_data *vc)
585 {
586 struct uni_screen *uniscr = get_vc_uniscr(vc);
587 unsigned short *p;
588 int x, y, mask;
589
590 if (!VC_UNI_SCREEN_DEBUG || !uniscr)
591 return;
592
593 WARN_CONSOLE_UNLOCKED();
594
595 /*
596 * Make sure our unicode screen translates into the same glyphs
597 * as the actual screen. This is brutal indeed.
598 */
599 p = (unsigned short *)vc->vc_origin;
600 mask = vc->vc_hi_font_mask | 0xff;
601 for (y = 0; y < vc->vc_rows; y++) {
602 char32_t *line = uniscr->lines[y];
603 for (x = 0; x < vc->vc_cols; x++) {
604 u16 glyph = scr_readw(p++) & mask;
605 char32_t uc = line[x];
606 int tc = conv_uni_to_pc(vc, uc);
607 if (tc == -4)
608 tc = conv_uni_to_pc(vc, 0xfffd);
609 if (tc == -4)
610 tc = conv_uni_to_pc(vc, '?');
611 if (tc != glyph)
612 pr_err_ratelimited(
613 "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
614 __func__, x, y, glyph, tc);
615 }
616 }
617 }
618
619
620 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
621 enum con_scroll dir, unsigned int nr)
622 {
623 u16 *clear, *d, *s;
624
625 if (t + nr >= b)
626 nr = b - t - 1;
627 if (b > vc->vc_rows || t >= b || nr < 1)
628 return;
629 vc_uniscr_scroll(vc, t, b, dir, nr);
630 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
631 return;
632
633 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
634 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
635
636 if (dir == SM_UP) {
637 clear = s + (b - t - nr) * vc->vc_cols;
638 swap(s, d);
639 }
640 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
641 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
642 }
643
644 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
645 {
646 unsigned int xx, yy, offset;
647 u16 *p;
648
649 p = (u16 *) start;
650 if (!vc->vc_sw->con_getxy) {
651 offset = (start - vc->vc_origin) / 2;
652 xx = offset % vc->vc_cols;
653 yy = offset / vc->vc_cols;
654 } else {
655 int nxx, nyy;
656 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
657 xx = nxx; yy = nyy;
658 }
659 for(;;) {
660 u16 attrib = scr_readw(p) & 0xff00;
661 int startx = xx;
662 u16 *q = p;
663 while (xx < vc->vc_cols && count) {
664 if (attrib != (scr_readw(p) & 0xff00)) {
665 if (p > q)
666 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
667 startx = xx;
668 q = p;
669 attrib = scr_readw(p) & 0xff00;
670 }
671 p++;
672 xx++;
673 count--;
674 }
675 if (p > q)
676 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
677 if (!count)
678 break;
679 xx = 0;
680 yy++;
681 if (vc->vc_sw->con_getxy) {
682 p = (u16 *)start;
683 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
684 }
685 }
686 }
687
688 void update_region(struct vc_data *vc, unsigned long start, int count)
689 {
690 WARN_CONSOLE_UNLOCKED();
691
692 if (con_should_update(vc)) {
693 hide_cursor(vc);
694 do_update_region(vc, start, count);
695 set_cursor(vc);
696 }
697 }
698
699 /* Structure of attributes is hardware-dependent */
700
701 static u8 build_attr(struct vc_data *vc, u8 _color,
702 enum vc_intensity _intensity, bool _blink, bool _underline,
703 bool _reverse, bool _italic)
704 {
705 if (vc->vc_sw->con_build_attr)
706 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
707 _blink, _underline, _reverse, _italic);
708
709 /*
710 * ++roman: I completely changed the attribute format for monochrome
711 * mode (!can_do_color). The formerly used MDA (monochrome display
712 * adapter) format didn't allow the combination of certain effects.
713 * Now the attribute is just a bit vector:
714 * Bit 0..1: intensity (0..2)
715 * Bit 2 : underline
716 * Bit 3 : reverse
717 * Bit 7 : blink
718 */
719 {
720 u8 a = _color;
721 if (!vc->vc_can_do_color)
722 return _intensity |
723 (_italic << 1) |
724 (_underline << 2) |
725 (_reverse << 3) |
726 (_blink << 7);
727 if (_italic)
728 a = (a & 0xF0) | vc->vc_itcolor;
729 else if (_underline)
730 a = (a & 0xf0) | vc->vc_ulcolor;
731 else if (_intensity == VCI_HALF_BRIGHT)
732 a = (a & 0xf0) | vc->vc_halfcolor;
733 if (_reverse)
734 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
735 if (_blink)
736 a ^= 0x80;
737 if (_intensity == VCI_BOLD)
738 a ^= 0x08;
739 if (vc->vc_hi_font_mask == 0x100)
740 a <<= 1;
741 return a;
742 }
743 }
744
745 static void update_attr(struct vc_data *vc)
746 {
747 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
748 vc->state.blink, vc->state.underline,
749 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
750 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
751 VCI_NORMAL, vc->state.blink, false,
752 vc->vc_decscnm, false) << 8);
753 }
754
755 /* Note: inverting the screen twice should revert to the original state */
756 void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
757 {
758 unsigned short *p;
759
760 WARN_CONSOLE_UNLOCKED();
761
762 count /= 2;
763 p = screenpos(vc, offset, viewed);
764 if (vc->vc_sw->con_invert_region) {
765 vc->vc_sw->con_invert_region(vc, p, count);
766 } else {
767 u16 *q = p;
768 int cnt = count;
769 u16 a;
770
771 if (!vc->vc_can_do_color) {
772 while (cnt--) {
773 a = scr_readw(q);
774 a ^= 0x0800;
775 scr_writew(a, q);
776 q++;
777 }
778 } else if (vc->vc_hi_font_mask == 0x100) {
779 while (cnt--) {
780 a = scr_readw(q);
781 a = (a & 0x11ff) |
782 ((a & 0xe000) >> 4) |
783 ((a & 0x0e00) << 4);
784 scr_writew(a, q);
785 q++;
786 }
787 } else {
788 while (cnt--) {
789 a = scr_readw(q);
790 a = (a & 0x88ff) |
791 ((a & 0x7000) >> 4) |
792 ((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, true));
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, true);
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->state.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->state.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->state.x - nr) * 2);
859 scr_memsetw(p + vc->vc_cols - vc->state.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->state.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 & CUR_SW))
875 return;
876 if (softcursor_original != -1)
877 return;
878 softcursor_original = i;
879 i |= CUR_SET(type);
880 i ^= CUR_CHANGE(type);
881 if ((type & CUR_ALWAYS_BG) &&
882 (softcursor_original & CUR_BG) == (i & CUR_BG))
883 i ^= CUR_BG;
884 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
885 i ^= CUR_FG;
886 scr_writew(i, (u16 *)vc->vc_pos);
887 if (con_should_update(vc))
888 vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x);
889 }
890
891 static void hide_softcursor(struct vc_data *vc)
892 {
893 if (softcursor_original != -1) {
894 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
895 if (con_should_update(vc))
896 vc->vc_sw->con_putc(vc, softcursor_original,
897 vc->state.y, vc->state.x);
898 softcursor_original = -1;
899 }
900 }
901
902 static void hide_cursor(struct vc_data *vc)
903 {
904 if (vc_is_sel(vc))
905 clear_selection();
906
907 vc->vc_sw->con_cursor(vc, CM_ERASE);
908 hide_softcursor(vc);
909 }
910
911 static void set_cursor(struct vc_data *vc)
912 {
913 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
914 return;
915 if (vc->vc_deccm) {
916 if (vc_is_sel(vc))
917 clear_selection();
918 add_softcursor(vc);
919 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
920 vc->vc_sw->con_cursor(vc, CM_DRAW);
921 } else
922 hide_cursor(vc);
923 }
924
925 static void set_origin(struct vc_data *vc)
926 {
927 WARN_CONSOLE_UNLOCKED();
928
929 if (!con_is_visible(vc) ||
930 !vc->vc_sw->con_set_origin ||
931 !vc->vc_sw->con_set_origin(vc))
932 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
933 vc->vc_visible_origin = vc->vc_origin;
934 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
935 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
936 2 * vc->state.x;
937 }
938
939 static void save_screen(struct vc_data *vc)
940 {
941 WARN_CONSOLE_UNLOCKED();
942
943 if (vc->vc_sw->con_save_screen)
944 vc->vc_sw->con_save_screen(vc);
945 }
946
947 static void flush_scrollback(struct vc_data *vc)
948 {
949 WARN_CONSOLE_UNLOCKED();
950
951 set_origin(vc);
952 if (vc->vc_sw->con_flush_scrollback) {
953 vc->vc_sw->con_flush_scrollback(vc);
954 } else if (con_is_visible(vc)) {
955 /*
956 * When no con_flush_scrollback method is provided then the
957 * legacy way for flushing the scrollback buffer is to use
958 * a side effect of the con_switch method. We do it only on
959 * the foreground console as background consoles have no
960 * scrollback buffers in that case and we obviously don't
961 * want to switch to them.
962 */
963 hide_cursor(vc);
964 vc->vc_sw->con_switch(vc);
965 set_cursor(vc);
966 }
967 }
968
969 /*
970 * Redrawing of screen
971 */
972
973 void clear_buffer_attributes(struct vc_data *vc)
974 {
975 unsigned short *p = (unsigned short *)vc->vc_origin;
976 int count = vc->vc_screenbuf_size / 2;
977 int mask = vc->vc_hi_font_mask | 0xff;
978
979 for (; count > 0; count--, p++) {
980 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
981 }
982 }
983
984 void redraw_screen(struct vc_data *vc, int is_switch)
985 {
986 int redraw = 0;
987
988 WARN_CONSOLE_UNLOCKED();
989
990 if (!vc) {
991 /* strange ... */
992 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
993 return;
994 }
995
996 if (is_switch) {
997 struct vc_data *old_vc = vc_cons[fg_console].d;
998 if (old_vc == vc)
999 return;
1000 if (!con_is_visible(vc))
1001 redraw = 1;
1002 *vc->vc_display_fg = vc;
1003 fg_console = vc->vc_num;
1004 hide_cursor(old_vc);
1005 if (!con_is_visible(old_vc)) {
1006 save_screen(old_vc);
1007 set_origin(old_vc);
1008 }
1009 if (tty0dev)
1010 sysfs_notify(&tty0dev->kobj, NULL, "active");
1011 } else {
1012 hide_cursor(vc);
1013 redraw = 1;
1014 }
1015
1016 if (redraw) {
1017 int update;
1018 int old_was_color = vc->vc_can_do_color;
1019
1020 set_origin(vc);
1021 update = vc->vc_sw->con_switch(vc);
1022 set_palette(vc);
1023 /*
1024 * If console changed from mono<->color, the best we can do
1025 * is to clear the buffer attributes. As it currently stands,
1026 * rebuilding new attributes from the old buffer is not doable
1027 * without overly complex code.
1028 */
1029 if (old_was_color != vc->vc_can_do_color) {
1030 update_attr(vc);
1031 clear_buffer_attributes(vc);
1032 }
1033
1034 if (update && vc->vc_mode != KD_GRAPHICS)
1035 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1036 }
1037 set_cursor(vc);
1038 if (is_switch) {
1039 set_leds();
1040 compute_shiftstate();
1041 notify_update(vc);
1042 }
1043 }
1044
1045 /*
1046 * Allocation, freeing and resizing of VTs.
1047 */
1048
1049 int vc_cons_allocated(unsigned int i)
1050 {
1051 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1052 }
1053
1054 static void visual_init(struct vc_data *vc, int num, int init)
1055 {
1056 /* ++Geert: vc->vc_sw->con_init determines console size */
1057 if (vc->vc_sw)
1058 module_put(vc->vc_sw->owner);
1059 vc->vc_sw = conswitchp;
1060 #ifndef VT_SINGLE_DRIVER
1061 if (con_driver_map[num])
1062 vc->vc_sw = con_driver_map[num];
1063 #endif
1064 __module_get(vc->vc_sw->owner);
1065 vc->vc_num = num;
1066 vc->vc_display_fg = &master_display_fg;
1067 if (vc->vc_uni_pagedir_loc)
1068 con_free_unimap(vc);
1069 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
1070 vc->vc_uni_pagedir = NULL;
1071 vc->vc_hi_font_mask = 0;
1072 vc->vc_complement_mask = 0;
1073 vc->vc_can_do_color = 0;
1074 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1075 vc->vc_sw->con_init(vc, init);
1076 if (!vc->vc_complement_mask)
1077 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1078 vc->vc_s_complement_mask = vc->vc_complement_mask;
1079 vc->vc_size_row = vc->vc_cols << 1;
1080 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1081 }
1082
1083
1084 static void visual_deinit(struct vc_data *vc)
1085 {
1086 vc->vc_sw->con_deinit(vc);
1087 module_put(vc->vc_sw->owner);
1088 }
1089
1090 static void vc_port_destruct(struct tty_port *port)
1091 {
1092 struct vc_data *vc = container_of(port, struct vc_data, port);
1093
1094 kfree(vc);
1095 }
1096
1097 static const struct tty_port_operations vc_port_ops = {
1098 .destruct = vc_port_destruct,
1099 };
1100
1101 /*
1102 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1103 * [this is to be used together with some user program
1104 * like resize that changes the hardware videomode]
1105 */
1106 #define VC_MAXCOL (32767)
1107 #define VC_MAXROW (32767)
1108
1109 int vc_allocate(unsigned int currcons) /* return 0 on success */
1110 {
1111 struct vt_notifier_param param;
1112 struct vc_data *vc;
1113 int err;
1114
1115 WARN_CONSOLE_UNLOCKED();
1116
1117 if (currcons >= MAX_NR_CONSOLES)
1118 return -ENXIO;
1119
1120 if (vc_cons[currcons].d)
1121 return 0;
1122
1123 /* due to the granularity of kmalloc, we waste some memory here */
1124 /* the alloc is done in two steps, to optimize the common situation
1125 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1126 /* although the numbers above are not valid since long ago, the
1127 point is still up-to-date and the comment still has its value
1128 even if only as a historical artifact. --mj, July 1998 */
1129 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1130 if (!vc)
1131 return -ENOMEM;
1132
1133 vc_cons[currcons].d = vc;
1134 tty_port_init(&vc->port);
1135 vc->port.ops = &vc_port_ops;
1136 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1137
1138 visual_init(vc, currcons, 1);
1139
1140 if (!*vc->vc_uni_pagedir_loc)
1141 con_set_default_unimap(vc);
1142
1143 err = -EINVAL;
1144 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1145 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1146 goto err_free;
1147 err = -ENOMEM;
1148 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1149 if (!vc->vc_screenbuf)
1150 goto err_free;
1151
1152 /* If no drivers have overridden us and the user didn't pass a
1153 boot option, default to displaying the cursor */
1154 if (global_cursor_default == -1)
1155 global_cursor_default = 1;
1156
1157 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1158 vcs_make_sysfs(currcons);
1159 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1160
1161 return 0;
1162 err_free:
1163 visual_deinit(vc);
1164 kfree(vc);
1165 vc_cons[currcons].d = NULL;
1166 return err;
1167 }
1168
1169 static inline int resize_screen(struct vc_data *vc, int width, int height,
1170 int user)
1171 {
1172 /* Resizes the resolution of the display adapater */
1173 int err = 0;
1174
1175 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
1176 err = vc->vc_sw->con_resize(vc, width, height, user);
1177
1178 return err;
1179 }
1180
1181 /**
1182 * vc_do_resize - resizing method for the tty
1183 * @tty: tty being resized
1184 * @vc: virtual console private data
1185 * @cols: columns
1186 * @lines: lines
1187 *
1188 * Resize a virtual console, clipping according to the actual constraints.
1189 * If the caller passes a tty structure then update the termios winsize
1190 * information and perform any necessary signal handling.
1191 *
1192 * Caller must hold the console semaphore. Takes the termios rwsem and
1193 * ctrl_lock of the tty IFF a tty is passed.
1194 */
1195
1196 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1197 unsigned int cols, unsigned int lines)
1198 {
1199 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1200 unsigned long end;
1201 unsigned int old_rows, old_row_size, first_copied_row;
1202 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1203 unsigned int user;
1204 unsigned short *oldscreen, *newscreen;
1205 struct uni_screen *new_uniscr = NULL;
1206
1207 WARN_CONSOLE_UNLOCKED();
1208
1209 if (!vc)
1210 return -ENXIO;
1211
1212 user = vc->vc_resize_user;
1213 vc->vc_resize_user = 0;
1214
1215 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1216 return -EINVAL;
1217
1218 new_cols = (cols ? cols : vc->vc_cols);
1219 new_rows = (lines ? lines : vc->vc_rows);
1220 new_row_size = new_cols << 1;
1221 new_screen_size = new_row_size * new_rows;
1222
1223 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1224 return 0;
1225
1226 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1227 return -EINVAL;
1228 newscreen = kzalloc(new_screen_size, GFP_USER);
1229 if (!newscreen)
1230 return -ENOMEM;
1231
1232 if (get_vc_uniscr(vc)) {
1233 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1234 if (!new_uniscr) {
1235 kfree(newscreen);
1236 return -ENOMEM;
1237 }
1238 }
1239
1240 if (vc_is_sel(vc))
1241 clear_selection();
1242
1243 old_rows = vc->vc_rows;
1244 old_row_size = vc->vc_size_row;
1245
1246 err = resize_screen(vc, new_cols, new_rows, user);
1247 if (err) {
1248 kfree(newscreen);
1249 vc_uniscr_free(new_uniscr);
1250 return err;
1251 }
1252
1253 vc->vc_rows = new_rows;
1254 vc->vc_cols = new_cols;
1255 vc->vc_size_row = new_row_size;
1256 vc->vc_screenbuf_size = new_screen_size;
1257
1258 rlth = min(old_row_size, new_row_size);
1259 rrem = new_row_size - rlth;
1260 old_origin = vc->vc_origin;
1261 new_origin = (long) newscreen;
1262 new_scr_end = new_origin + new_screen_size;
1263
1264 if (vc->state.y > new_rows) {
1265 if (old_rows - vc->state.y < new_rows) {
1266 /*
1267 * Cursor near the bottom, copy contents from the
1268 * bottom of buffer
1269 */
1270 first_copied_row = (old_rows - new_rows);
1271 } else {
1272 /*
1273 * Cursor is in no man's land, copy 1/2 screenful
1274 * from the top and bottom of cursor position
1275 */
1276 first_copied_row = (vc->state.y - new_rows/2);
1277 }
1278 old_origin += first_copied_row * old_row_size;
1279 } else
1280 first_copied_row = 0;
1281 end = old_origin + old_row_size * min(old_rows, new_rows);
1282
1283 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1284 get_vc_uniscr(vc), rlth/2, first_copied_row,
1285 min(old_rows, new_rows));
1286 vc_uniscr_set(vc, new_uniscr);
1287
1288 update_attr(vc);
1289
1290 while (old_origin < end) {
1291 scr_memcpyw((unsigned short *) new_origin,
1292 (unsigned short *) old_origin, rlth);
1293 if (rrem)
1294 scr_memsetw((void *)(new_origin + rlth),
1295 vc->vc_video_erase_char, rrem);
1296 old_origin += old_row_size;
1297 new_origin += new_row_size;
1298 }
1299 if (new_scr_end > new_origin)
1300 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1301 new_scr_end - new_origin);
1302 oldscreen = vc->vc_screenbuf;
1303 vc->vc_screenbuf = newscreen;
1304 vc->vc_screenbuf_size = new_screen_size;
1305 set_origin(vc);
1306 kfree(oldscreen);
1307
1308 /* do part of a reset_terminal() */
1309 vc->vc_top = 0;
1310 vc->vc_bottom = vc->vc_rows;
1311 gotoxy(vc, vc->state.x, vc->state.y);
1312 save_cur(vc);
1313
1314 if (tty) {
1315 /* Rewrite the requested winsize data with the actual
1316 resulting sizes */
1317 struct winsize ws;
1318 memset(&ws, 0, sizeof(ws));
1319 ws.ws_row = vc->vc_rows;
1320 ws.ws_col = vc->vc_cols;
1321 ws.ws_ypixel = vc->vc_scan_lines;
1322 tty_do_resize(tty, &ws);
1323 }
1324
1325 if (con_is_visible(vc))
1326 update_screen(vc);
1327 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1328 notify_update(vc);
1329 return err;
1330 }
1331
1332 /**
1333 * vc_resize - resize a VT
1334 * @vc: virtual console
1335 * @cols: columns
1336 * @rows: rows
1337 *
1338 * Resize a virtual console as seen from the console end of things. We
1339 * use the common vc_do_resize methods to update the structures. The
1340 * caller must hold the console sem to protect console internals and
1341 * vc->port.tty
1342 */
1343
1344 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1345 {
1346 return vc_do_resize(vc->port.tty, vc, cols, rows);
1347 }
1348
1349 /**
1350 * vt_resize - resize a VT
1351 * @tty: tty to resize
1352 * @ws: winsize attributes
1353 *
1354 * Resize a virtual terminal. This is called by the tty layer as we
1355 * register our own handler for resizing. The mutual helper does all
1356 * the actual work.
1357 *
1358 * Takes the console sem and the called methods then take the tty
1359 * termios_rwsem and the tty ctrl_lock in that order.
1360 */
1361 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1362 {
1363 struct vc_data *vc = tty->driver_data;
1364 int ret;
1365
1366 console_lock();
1367 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1368 console_unlock();
1369 return ret;
1370 }
1371
1372 struct vc_data *vc_deallocate(unsigned int currcons)
1373 {
1374 struct vc_data *vc = NULL;
1375
1376 WARN_CONSOLE_UNLOCKED();
1377
1378 if (vc_cons_allocated(currcons)) {
1379 struct vt_notifier_param param;
1380
1381 param.vc = vc = vc_cons[currcons].d;
1382 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1383 vcs_remove_sysfs(currcons);
1384 visual_deinit(vc);
1385 put_pid(vc->vt_pid);
1386 vc_uniscr_set(vc, NULL);
1387 kfree(vc->vc_screenbuf);
1388 vc_cons[currcons].d = NULL;
1389 }
1390 return vc;
1391 }
1392
1393 /*
1394 * VT102 emulator
1395 */
1396
1397 enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1398
1399 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1400 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1401 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1402
1403 #define decarm VC_REPEAT
1404 #define decckm VC_CKMODE
1405 #define kbdapplic VC_APPLIC
1406 #define lnm VC_CRLF
1407
1408 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1409 8,12,10,14, 9,13,11,15 };
1410
1411 /* the default colour table, for VGA+ colour systems */
1412 unsigned char default_red[] = {
1413 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1414 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1415 };
1416 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1417
1418 unsigned char default_grn[] = {
1419 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1420 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1421 };
1422 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1423
1424 unsigned char default_blu[] = {
1425 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1426 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1427 };
1428 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1429
1430 /*
1431 * gotoxy() must verify all boundaries, because the arguments
1432 * might also be negative. If the given position is out of
1433 * bounds, the cursor is placed at the nearest margin.
1434 */
1435 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1436 {
1437 int min_y, max_y;
1438
1439 if (new_x < 0)
1440 vc->state.x = 0;
1441 else {
1442 if (new_x >= vc->vc_cols)
1443 vc->state.x = vc->vc_cols - 1;
1444 else
1445 vc->state.x = new_x;
1446 }
1447
1448 if (vc->vc_decom) {
1449 min_y = vc->vc_top;
1450 max_y = vc->vc_bottom;
1451 } else {
1452 min_y = 0;
1453 max_y = vc->vc_rows;
1454 }
1455 if (new_y < min_y)
1456 vc->state.y = min_y;
1457 else if (new_y >= max_y)
1458 vc->state.y = max_y - 1;
1459 else
1460 vc->state.y = new_y;
1461 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1462 (vc->state.x << 1);
1463 vc->vc_need_wrap = 0;
1464 }
1465
1466 /* for absolute user moves, when decom is set */
1467 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1468 {
1469 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1470 }
1471
1472 void scrollback(struct vc_data *vc)
1473 {
1474 scrolldelta(-(vc->vc_rows / 2));
1475 }
1476
1477 void scrollfront(struct vc_data *vc, int lines)
1478 {
1479 if (!lines)
1480 lines = vc->vc_rows / 2;
1481 scrolldelta(lines);
1482 }
1483
1484 static void lf(struct vc_data *vc)
1485 {
1486 /* don't scroll if above bottom of scrolling region, or
1487 * if below scrolling region
1488 */
1489 if (vc->state.y + 1 == vc->vc_bottom)
1490 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1491 else if (vc->state.y < vc->vc_rows - 1) {
1492 vc->state.y++;
1493 vc->vc_pos += vc->vc_size_row;
1494 }
1495 vc->vc_need_wrap = 0;
1496 notify_write(vc, '\n');
1497 }
1498
1499 static void ri(struct vc_data *vc)
1500 {
1501 /* don't scroll if below top of scrolling region, or
1502 * if above scrolling region
1503 */
1504 if (vc->state.y == vc->vc_top)
1505 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1506 else if (vc->state.y > 0) {
1507 vc->state.y--;
1508 vc->vc_pos -= vc->vc_size_row;
1509 }
1510 vc->vc_need_wrap = 0;
1511 }
1512
1513 static inline void cr(struct vc_data *vc)
1514 {
1515 vc->vc_pos -= vc->state.x << 1;
1516 vc->vc_need_wrap = vc->state.x = 0;
1517 notify_write(vc, '\r');
1518 }
1519
1520 static inline void bs(struct vc_data *vc)
1521 {
1522 if (vc->state.x) {
1523 vc->vc_pos -= 2;
1524 vc->state.x--;
1525 vc->vc_need_wrap = 0;
1526 notify_write(vc, '\b');
1527 }
1528 }
1529
1530 static inline void del(struct vc_data *vc)
1531 {
1532 /* ignored */
1533 }
1534
1535 static void csi_J(struct vc_data *vc, int vpar)
1536 {
1537 unsigned int count;
1538 unsigned short * start;
1539
1540 switch (vpar) {
1541 case 0: /* erase from cursor to end of display */
1542 vc_uniscr_clear_line(vc, vc->state.x,
1543 vc->vc_cols - vc->state.x);
1544 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1545 vc->vc_rows - vc->state.y - 1);
1546 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1547 start = (unsigned short *)vc->vc_pos;
1548 break;
1549 case 1: /* erase from start to cursor */
1550 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1551 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1552 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1553 start = (unsigned short *)vc->vc_origin;
1554 break;
1555 case 3: /* include scrollback */
1556 flush_scrollback(vc);
1557 fallthrough;
1558 case 2: /* erase whole display */
1559 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1560 count = vc->vc_cols * vc->vc_rows;
1561 start = (unsigned short *)vc->vc_origin;
1562 break;
1563 default:
1564 return;
1565 }
1566 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1567 if (con_should_update(vc))
1568 do_update_region(vc, (unsigned long) start, count);
1569 vc->vc_need_wrap = 0;
1570 }
1571
1572 static void csi_K(struct vc_data *vc, int vpar)
1573 {
1574 unsigned int count;
1575 unsigned short *start = (unsigned short *)vc->vc_pos;
1576 int offset;
1577
1578 switch (vpar) {
1579 case 0: /* erase from cursor to end of line */
1580 offset = 0;
1581 count = vc->vc_cols - vc->state.x;
1582 break;
1583 case 1: /* erase from start of line to cursor */
1584 offset = -vc->state.x;
1585 count = vc->state.x + 1;
1586 break;
1587 case 2: /* erase whole line */
1588 offset = -vc->state.x;
1589 count = vc->vc_cols;
1590 break;
1591 default:
1592 return;
1593 }
1594 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
1595 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1596 vc->vc_need_wrap = 0;
1597 if (con_should_update(vc))
1598 do_update_region(vc, (unsigned long)(start + offset), count);
1599 }
1600
1601 /* erase the following vpar positions */
1602 static void csi_X(struct vc_data *vc, unsigned int vpar)
1603 { /* not vt100? */
1604 unsigned int count;
1605
1606 if (!vpar)
1607 vpar++;
1608
1609 count = min(vpar, vc->vc_cols - vc->state.x);
1610
1611 vc_uniscr_clear_line(vc, vc->state.x, count);
1612 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1613 if (con_should_update(vc))
1614 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
1615 vc->vc_need_wrap = 0;
1616 }
1617
1618 static void default_attr(struct vc_data *vc)
1619 {
1620 vc->state.intensity = VCI_NORMAL;
1621 vc->state.italic = false;
1622 vc->state.underline = false;
1623 vc->state.reverse = false;
1624 vc->state.blink = false;
1625 vc->state.color = vc->vc_def_color;
1626 }
1627
1628 struct rgb { u8 r; u8 g; u8 b; };
1629
1630 static void rgb_from_256(int i, struct rgb *c)
1631 {
1632 if (i < 8) { /* Standard colours. */
1633 c->r = i&1 ? 0xaa : 0x00;
1634 c->g = i&2 ? 0xaa : 0x00;
1635 c->b = i&4 ? 0xaa : 0x00;
1636 } else if (i < 16) {
1637 c->r = i&1 ? 0xff : 0x55;
1638 c->g = i&2 ? 0xff : 0x55;
1639 c->b = i&4 ? 0xff : 0x55;
1640 } else if (i < 232) { /* 6x6x6 colour cube. */
1641 c->r = (i - 16) / 36 * 85 / 2;
1642 c->g = (i - 16) / 6 % 6 * 85 / 2;
1643 c->b = (i - 16) % 6 * 85 / 2;
1644 } else /* Grayscale ramp. */
1645 c->r = c->g = c->b = i * 10 - 2312;
1646 }
1647
1648 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1649 {
1650 u8 hue = 0, max = max3(c->r, c->g, c->b);
1651
1652 if (c->r > max / 2)
1653 hue |= 4;
1654 if (c->g > max / 2)
1655 hue |= 2;
1656 if (c->b > max / 2)
1657 hue |= 1;
1658
1659 if (hue == 7 && max <= 0x55) {
1660 hue = 0;
1661 vc->state.intensity = VCI_BOLD;
1662 } else if (max > 0xaa)
1663 vc->state.intensity = VCI_BOLD;
1664 else
1665 vc->state.intensity = VCI_NORMAL;
1666
1667 vc->state.color = (vc->state.color & 0xf0) | hue;
1668 }
1669
1670 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1671 {
1672 /* For backgrounds, err on the dark side. */
1673 vc->state.color = (vc->state.color & 0x0f)
1674 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1675 }
1676
1677 /*
1678 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1679 * and thus need to be detected and ignored by hand. That standard also
1680 * wants : rather than ; as separators but sequences containing : are currently
1681 * completely ignored by the parser.
1682 *
1683 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1684 * supporting them.
1685 */
1686 static int vc_t416_color(struct vc_data *vc, int i,
1687 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1688 {
1689 struct rgb c;
1690
1691 i++;
1692 if (i > vc->vc_npar)
1693 return i;
1694
1695 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1696 /* 256 colours */
1697 i++;
1698 rgb_from_256(vc->vc_par[i], &c);
1699 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1700 /* 24 bit */
1701 c.r = vc->vc_par[i + 1];
1702 c.g = vc->vc_par[i + 2];
1703 c.b = vc->vc_par[i + 3];
1704 i += 3;
1705 } else
1706 return i;
1707
1708 set_color(vc, &c);
1709
1710 return i;
1711 }
1712
1713 /* console_lock is held */
1714 static void csi_m(struct vc_data *vc)
1715 {
1716 int i;
1717
1718 for (i = 0; i <= vc->vc_npar; i++)
1719 switch (vc->vc_par[i]) {
1720 case 0: /* all attributes off */
1721 default_attr(vc);
1722 break;
1723 case 1:
1724 vc->state.intensity = VCI_BOLD;
1725 break;
1726 case 2:
1727 vc->state.intensity = VCI_HALF_BRIGHT;
1728 break;
1729 case 3:
1730 vc->state.italic = true;
1731 break;
1732 case 21:
1733 /*
1734 * No console drivers support double underline, so
1735 * convert it to a single underline.
1736 */
1737 case 4:
1738 vc->state.underline = true;
1739 break;
1740 case 5:
1741 vc->state.blink = true;
1742 break;
1743 case 7:
1744 vc->state.reverse = true;
1745 break;
1746 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1747 * Select primary font, don't display control chars if
1748 * defined, don't set bit 8 on output.
1749 */
1750 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
1751 vc->vc_disp_ctrl = 0;
1752 vc->vc_toggle_meta = 0;
1753 break;
1754 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1755 * Select first alternate font, lets chars < 32 be
1756 * displayed as ROM chars.
1757 */
1758 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1759 vc->vc_disp_ctrl = 1;
1760 vc->vc_toggle_meta = 0;
1761 break;
1762 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1763 * Select second alternate font, toggle high bit
1764 * before displaying as ROM char.
1765 */
1766 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1767 vc->vc_disp_ctrl = 1;
1768 vc->vc_toggle_meta = 1;
1769 break;
1770 case 22:
1771 vc->state.intensity = VCI_NORMAL;
1772 break;
1773 case 23:
1774 vc->state.italic = false;
1775 break;
1776 case 24:
1777 vc->state.underline = false;
1778 break;
1779 case 25:
1780 vc->state.blink = false;
1781 break;
1782 case 27:
1783 vc->state.reverse = false;
1784 break;
1785 case 38:
1786 i = vc_t416_color(vc, i, rgb_foreground);
1787 break;
1788 case 48:
1789 i = vc_t416_color(vc, i, rgb_background);
1790 break;
1791 case 39:
1792 vc->state.color = (vc->vc_def_color & 0x0f) |
1793 (vc->state.color & 0xf0);
1794 break;
1795 case 49:
1796 vc->state.color = (vc->vc_def_color & 0xf0) |
1797 (vc->state.color & 0x0f);
1798 break;
1799 default:
1800 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1801 if (vc->vc_par[i] < 100)
1802 vc->state.intensity = VCI_BOLD;
1803 vc->vc_par[i] -= 60;
1804 }
1805 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1806 vc->state.color = color_table[vc->vc_par[i] - 30]
1807 | (vc->state.color & 0xf0);
1808 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1809 vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
1810 | (vc->state.color & 0x0f);
1811 break;
1812 }
1813 update_attr(vc);
1814 }
1815
1816 static void respond_string(const char *p, size_t len, struct tty_port *port)
1817 {
1818 tty_insert_flip_string(port, p, len);
1819 tty_schedule_flip(port);
1820 }
1821
1822 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1823 {
1824 char buf[40];
1825 int len;
1826
1827 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1828 (vc->vc_decom ? vc->vc_top + 1 : 1),
1829 vc->state.x + 1);
1830 respond_string(buf, len, tty->port);
1831 }
1832
1833 static inline void status_report(struct tty_struct *tty)
1834 {
1835 static const char teminal_ok[] = "\033[0n";
1836
1837 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1838 }
1839
1840 static inline void respond_ID(struct tty_struct *tty)
1841 {
1842 /* terminal answer to an ESC-Z or csi0c query. */
1843 static const char vt102_id[] = "\033[?6c";
1844
1845 respond_string(vt102_id, strlen(vt102_id), tty->port);
1846 }
1847
1848 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1849 {
1850 char buf[8];
1851 int len;
1852
1853 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1854 (char)('!' + mrx), (char)('!' + mry));
1855 respond_string(buf, len, tty->port);
1856 }
1857
1858 /* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1859 int mouse_reporting(void)
1860 {
1861 return vc_cons[fg_console].d->vc_report_mouse;
1862 }
1863
1864 /* console_lock is held */
1865 static void set_mode(struct vc_data *vc, int on_off)
1866 {
1867 int i;
1868
1869 for (i = 0; i <= vc->vc_npar; i++)
1870 if (vc->vc_priv == EPdec) {
1871 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1872 case 1: /* Cursor keys send ^[Ox/^[[x */
1873 if (on_off)
1874 set_kbd(vc, decckm);
1875 else
1876 clr_kbd(vc, decckm);
1877 break;
1878 case 3: /* 80/132 mode switch unimplemented */
1879 #if 0
1880 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1881 /* this alone does not suffice; some user mode
1882 utility has to change the hardware regs */
1883 #endif
1884 break;
1885 case 5: /* Inverted screen on/off */
1886 if (vc->vc_decscnm != on_off) {
1887 vc->vc_decscnm = on_off;
1888 invert_screen(vc, 0,
1889 vc->vc_screenbuf_size,
1890 false);
1891 update_attr(vc);
1892 }
1893 break;
1894 case 6: /* Origin relative/absolute */
1895 vc->vc_decom = on_off;
1896 gotoxay(vc, 0, 0);
1897 break;
1898 case 7: /* Autowrap on/off */
1899 vc->vc_decawm = on_off;
1900 break;
1901 case 8: /* Autorepeat on/off */
1902 if (on_off)
1903 set_kbd(vc, decarm);
1904 else
1905 clr_kbd(vc, decarm);
1906 break;
1907 case 9:
1908 vc->vc_report_mouse = on_off ? 1 : 0;
1909 break;
1910 case 25: /* Cursor on/off */
1911 vc->vc_deccm = on_off;
1912 break;
1913 case 1000:
1914 vc->vc_report_mouse = on_off ? 2 : 0;
1915 break;
1916 }
1917 } else {
1918 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1919 case 3: /* Monitor (display ctrls) */
1920 vc->vc_disp_ctrl = on_off;
1921 break;
1922 case 4: /* Insert Mode on/off */
1923 vc->vc_decim = on_off;
1924 break;
1925 case 20: /* Lf, Enter == CrLf/Lf */
1926 if (on_off)
1927 set_kbd(vc, lnm);
1928 else
1929 clr_kbd(vc, lnm);
1930 break;
1931 }
1932 }
1933 }
1934
1935 /* console_lock is held */
1936 static void setterm_command(struct vc_data *vc)
1937 {
1938 switch (vc->vc_par[0]) {
1939 case 1: /* set color for underline mode */
1940 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1941 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1942 if (vc->state.underline)
1943 update_attr(vc);
1944 }
1945 break;
1946 case 2: /* set color for half intensity mode */
1947 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1948 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1949 if (vc->state.intensity == VCI_HALF_BRIGHT)
1950 update_attr(vc);
1951 }
1952 break;
1953 case 8: /* store colors as defaults */
1954 vc->vc_def_color = vc->vc_attr;
1955 if (vc->vc_hi_font_mask == 0x100)
1956 vc->vc_def_color >>= 1;
1957 default_attr(vc);
1958 update_attr(vc);
1959 break;
1960 case 9: /* set blanking interval */
1961 blankinterval = min(vc->vc_par[1], 60U) * 60;
1962 poke_blanked_console();
1963 break;
1964 case 10: /* set bell frequency in Hz */
1965 if (vc->vc_npar >= 1)
1966 vc->vc_bell_pitch = vc->vc_par[1];
1967 else
1968 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1969 break;
1970 case 11: /* set bell duration in msec */
1971 if (vc->vc_npar >= 1)
1972 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1973 msecs_to_jiffies(vc->vc_par[1]) : 0;
1974 else
1975 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1976 break;
1977 case 12: /* bring specified console to the front */
1978 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1979 set_console(vc->vc_par[1] - 1);
1980 break;
1981 case 13: /* unblank the screen */
1982 poke_blanked_console();
1983 break;
1984 case 14: /* set vesa powerdown interval */
1985 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
1986 break;
1987 case 15: /* activate the previous console */
1988 set_console(last_console);
1989 break;
1990 case 16: /* set cursor blink duration in msec */
1991 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1992 vc->vc_par[1] <= USHRT_MAX)
1993 vc->vc_cur_blink_ms = vc->vc_par[1];
1994 else
1995 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1996 break;
1997 }
1998 }
1999
2000 /* console_lock is held */
2001 static void csi_at(struct vc_data *vc, unsigned int nr)
2002 {
2003 if (nr > vc->vc_cols - vc->state.x)
2004 nr = vc->vc_cols - vc->state.x;
2005 else if (!nr)
2006 nr = 1;
2007 insert_char(vc, nr);
2008 }
2009
2010 /* console_lock is held */
2011 static void csi_L(struct vc_data *vc, unsigned int nr)
2012 {
2013 if (nr > vc->vc_rows - vc->state.y)
2014 nr = vc->vc_rows - vc->state.y;
2015 else if (!nr)
2016 nr = 1;
2017 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
2018 vc->vc_need_wrap = 0;
2019 }
2020
2021 /* console_lock is held */
2022 static void csi_P(struct vc_data *vc, unsigned int nr)
2023 {
2024 if (nr > vc->vc_cols - vc->state.x)
2025 nr = vc->vc_cols - vc->state.x;
2026 else if (!nr)
2027 nr = 1;
2028 delete_char(vc, nr);
2029 }
2030
2031 /* console_lock is held */
2032 static void csi_M(struct vc_data *vc, unsigned int nr)
2033 {
2034 if (nr > vc->vc_rows - vc->state.y)
2035 nr = vc->vc_rows - vc->state.y;
2036 else if (!nr)
2037 nr=1;
2038 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
2039 vc->vc_need_wrap = 0;
2040 }
2041
2042 /* console_lock is held (except via vc_init->reset_terminal */
2043 static void save_cur(struct vc_data *vc)
2044 {
2045 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
2046 }
2047
2048 /* console_lock is held */
2049 static void restore_cur(struct vc_data *vc)
2050 {
2051 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2052
2053 gotoxy(vc, vc->state.x, vc->state.y);
2054 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2055 vc);
2056 update_attr(vc);
2057 vc->vc_need_wrap = 0;
2058 }
2059
2060 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2061 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2062 ESpalette, ESosc };
2063
2064 /* console_lock is held (except via vc_init()) */
2065 static void reset_terminal(struct vc_data *vc, int do_clear)
2066 {
2067 unsigned int i;
2068
2069 vc->vc_top = 0;
2070 vc->vc_bottom = vc->vc_rows;
2071 vc->vc_state = ESnormal;
2072 vc->vc_priv = EPecma;
2073 vc->vc_translate = set_translate(LAT1_MAP, vc);
2074 vc->state.Gx_charset[0] = LAT1_MAP;
2075 vc->state.Gx_charset[1] = GRAF_MAP;
2076 vc->state.charset = 0;
2077 vc->vc_need_wrap = 0;
2078 vc->vc_report_mouse = 0;
2079 vc->vc_utf = default_utf8;
2080 vc->vc_utf_count = 0;
2081
2082 vc->vc_disp_ctrl = 0;
2083 vc->vc_toggle_meta = 0;
2084
2085 vc->vc_decscnm = 0;
2086 vc->vc_decom = 0;
2087 vc->vc_decawm = 1;
2088 vc->vc_deccm = global_cursor_default;
2089 vc->vc_decim = 0;
2090
2091 vt_reset_keyboard(vc->vc_num);
2092
2093 vc->vc_cursor_type = cur_default;
2094 vc->vc_complement_mask = vc->vc_s_complement_mask;
2095
2096 default_attr(vc);
2097 update_attr(vc);
2098
2099 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2100 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2101 set_bit(i, vc->vc_tab_stop);
2102
2103 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2104 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2105 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2106
2107 gotoxy(vc, 0, 0);
2108 save_cur(vc);
2109 if (do_clear)
2110 csi_J(vc, 2);
2111 }
2112
2113 static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
2114 {
2115 unsigned char *charset = &vc->state.Gx_charset[which];
2116
2117 switch (c) {
2118 case '0':
2119 *charset = GRAF_MAP;
2120 break;
2121 case 'B':
2122 *charset = LAT1_MAP;
2123 break;
2124 case 'U':
2125 *charset = IBMPC_MAP;
2126 break;
2127 case 'K':
2128 *charset = USER_MAP;
2129 break;
2130 }
2131
2132 if (vc->state.charset == which)
2133 vc->vc_translate = set_translate(*charset, vc);
2134 }
2135
2136 /* console_lock is held */
2137 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2138 {
2139 /*
2140 * Control characters can be used in the _middle_
2141 * of an escape sequence.
2142 */
2143 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2144 return;
2145 switch (c) {
2146 case 0:
2147 return;
2148 case 7:
2149 if (vc->vc_state == ESosc)
2150 vc->vc_state = ESnormal;
2151 else if (vc->vc_bell_duration)
2152 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2153 return;
2154 case 8:
2155 bs(vc);
2156 return;
2157 case 9:
2158 vc->vc_pos -= (vc->state.x << 1);
2159
2160 vc->state.x = find_next_bit(vc->vc_tab_stop,
2161 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2162 vc->state.x + 1);
2163 if (vc->state.x >= VC_TABSTOPS_COUNT)
2164 vc->state.x = vc->vc_cols - 1;
2165
2166 vc->vc_pos += (vc->state.x << 1);
2167 notify_write(vc, '\t');
2168 return;
2169 case 10: case 11: case 12:
2170 lf(vc);
2171 if (!is_kbd(vc, lnm))
2172 return;
2173 fallthrough;
2174 case 13:
2175 cr(vc);
2176 return;
2177 case 14:
2178 vc->state.charset = 1;
2179 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
2180 vc->vc_disp_ctrl = 1;
2181 return;
2182 case 15:
2183 vc->state.charset = 0;
2184 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
2185 vc->vc_disp_ctrl = 0;
2186 return;
2187 case 24: case 26:
2188 vc->vc_state = ESnormal;
2189 return;
2190 case 27:
2191 vc->vc_state = ESesc;
2192 return;
2193 case 127:
2194 del(vc);
2195 return;
2196 case 128+27:
2197 vc->vc_state = ESsquare;
2198 return;
2199 }
2200 switch(vc->vc_state) {
2201 case ESesc:
2202 vc->vc_state = ESnormal;
2203 switch (c) {
2204 case '[':
2205 vc->vc_state = ESsquare;
2206 return;
2207 case ']':
2208 vc->vc_state = ESnonstd;
2209 return;
2210 case '%':
2211 vc->vc_state = ESpercent;
2212 return;
2213 case 'E':
2214 cr(vc);
2215 lf(vc);
2216 return;
2217 case 'M':
2218 ri(vc);
2219 return;
2220 case 'D':
2221 lf(vc);
2222 return;
2223 case 'H':
2224 if (vc->state.x < VC_TABSTOPS_COUNT)
2225 set_bit(vc->state.x, vc->vc_tab_stop);
2226 return;
2227 case 'Z':
2228 respond_ID(tty);
2229 return;
2230 case '7':
2231 save_cur(vc);
2232 return;
2233 case '8':
2234 restore_cur(vc);
2235 return;
2236 case '(':
2237 vc->vc_state = ESsetG0;
2238 return;
2239 case ')':
2240 vc->vc_state = ESsetG1;
2241 return;
2242 case '#':
2243 vc->vc_state = EShash;
2244 return;
2245 case 'c':
2246 reset_terminal(vc, 1);
2247 return;
2248 case '>': /* Numeric keypad */
2249 clr_kbd(vc, kbdapplic);
2250 return;
2251 case '=': /* Appl. keypad */
2252 set_kbd(vc, kbdapplic);
2253 return;
2254 }
2255 return;
2256 case ESnonstd:
2257 if (c=='P') { /* palette escape sequence */
2258 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2259 vc->vc_par[vc->vc_npar] = 0;
2260 vc->vc_npar = 0;
2261 vc->vc_state = ESpalette;
2262 return;
2263 } else if (c=='R') { /* reset palette */
2264 reset_palette(vc);
2265 vc->vc_state = ESnormal;
2266 } else if (c>='0' && c<='9')
2267 vc->vc_state = ESosc;
2268 else
2269 vc->vc_state = ESnormal;
2270 return;
2271 case ESpalette:
2272 if (isxdigit(c)) {
2273 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2274 if (vc->vc_npar == 7) {
2275 int i = vc->vc_par[0] * 3, j = 1;
2276 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2277 vc->vc_palette[i++] += vc->vc_par[j++];
2278 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2279 vc->vc_palette[i++] += vc->vc_par[j++];
2280 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2281 vc->vc_palette[i] += vc->vc_par[j];
2282 set_palette(vc);
2283 vc->vc_state = ESnormal;
2284 }
2285 } else
2286 vc->vc_state = ESnormal;
2287 return;
2288 case ESsquare:
2289 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2290 vc->vc_par[vc->vc_npar] = 0;
2291 vc->vc_npar = 0;
2292 vc->vc_state = ESgetpars;
2293 if (c == '[') { /* Function key */
2294 vc->vc_state=ESfunckey;
2295 return;
2296 }
2297 switch (c) {
2298 case '?':
2299 vc->vc_priv = EPdec;
2300 return;
2301 case '>':
2302 vc->vc_priv = EPgt;
2303 return;
2304 case '=':
2305 vc->vc_priv = EPeq;
2306 return;
2307 case '<':
2308 vc->vc_priv = EPlt;
2309 return;
2310 }
2311 vc->vc_priv = EPecma;
2312 fallthrough;
2313 case ESgetpars:
2314 if (c == ';' && vc->vc_npar < NPAR - 1) {
2315 vc->vc_npar++;
2316 return;
2317 } else if (c>='0' && c<='9') {
2318 vc->vc_par[vc->vc_npar] *= 10;
2319 vc->vc_par[vc->vc_npar] += c - '0';
2320 return;
2321 }
2322 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2323 vc->vc_state = EScsiignore;
2324 return;
2325 }
2326 vc->vc_state = ESnormal;
2327 switch(c) {
2328 case 'h':
2329 if (vc->vc_priv <= EPdec)
2330 set_mode(vc, 1);
2331 return;
2332 case 'l':
2333 if (vc->vc_priv <= EPdec)
2334 set_mode(vc, 0);
2335 return;
2336 case 'c':
2337 if (vc->vc_priv == EPdec) {
2338 if (vc->vc_par[0])
2339 vc->vc_cursor_type =
2340 CUR_MAKE(vc->vc_par[0],
2341 vc->vc_par[1],
2342 vc->vc_par[2]);
2343 else
2344 vc->vc_cursor_type = cur_default;
2345 return;
2346 }
2347 break;
2348 case 'm':
2349 if (vc->vc_priv == EPdec) {
2350 clear_selection();
2351 if (vc->vc_par[0])
2352 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2353 else
2354 vc->vc_complement_mask = vc->vc_s_complement_mask;
2355 return;
2356 }
2357 break;
2358 case 'n':
2359 if (vc->vc_priv == EPecma) {
2360 if (vc->vc_par[0] == 5)
2361 status_report(tty);
2362 else if (vc->vc_par[0] == 6)
2363 cursor_report(vc, tty);
2364 }
2365 return;
2366 }
2367 if (vc->vc_priv != EPecma) {
2368 vc->vc_priv = EPecma;
2369 return;
2370 }
2371 switch(c) {
2372 case 'G': case '`':
2373 if (vc->vc_par[0])
2374 vc->vc_par[0]--;
2375 gotoxy(vc, vc->vc_par[0], vc->state.y);
2376 return;
2377 case 'A':
2378 if (!vc->vc_par[0])
2379 vc->vc_par[0]++;
2380 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
2381 return;
2382 case 'B': case 'e':
2383 if (!vc->vc_par[0])
2384 vc->vc_par[0]++;
2385 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
2386 return;
2387 case 'C': case 'a':
2388 if (!vc->vc_par[0])
2389 vc->vc_par[0]++;
2390 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
2391 return;
2392 case 'D':
2393 if (!vc->vc_par[0])
2394 vc->vc_par[0]++;
2395 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
2396 return;
2397 case 'E':
2398 if (!vc->vc_par[0])
2399 vc->vc_par[0]++;
2400 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
2401 return;
2402 case 'F':
2403 if (!vc->vc_par[0])
2404 vc->vc_par[0]++;
2405 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
2406 return;
2407 case 'd':
2408 if (vc->vc_par[0])
2409 vc->vc_par[0]--;
2410 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
2411 return;
2412 case 'H': case 'f':
2413 if (vc->vc_par[0])
2414 vc->vc_par[0]--;
2415 if (vc->vc_par[1])
2416 vc->vc_par[1]--;
2417 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2418 return;
2419 case 'J':
2420 csi_J(vc, vc->vc_par[0]);
2421 return;
2422 case 'K':
2423 csi_K(vc, vc->vc_par[0]);
2424 return;
2425 case 'L':
2426 csi_L(vc, vc->vc_par[0]);
2427 return;
2428 case 'M':
2429 csi_M(vc, vc->vc_par[0]);
2430 return;
2431 case 'P':
2432 csi_P(vc, vc->vc_par[0]);
2433 return;
2434 case 'c':
2435 if (!vc->vc_par[0])
2436 respond_ID(tty);
2437 return;
2438 case 'g':
2439 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2440 set_bit(vc->state.x, vc->vc_tab_stop);
2441 else if (vc->vc_par[0] == 3)
2442 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2443 return;
2444 case 'm':
2445 csi_m(vc);
2446 return;
2447 case 'q': /* DECLL - but only 3 leds */
2448 /* map 0,1,2,3 to 0,1,2,4 */
2449 if (vc->vc_par[0] < 4)
2450 vt_set_led_state(vc->vc_num,
2451 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2452 return;
2453 case 'r':
2454 if (!vc->vc_par[0])
2455 vc->vc_par[0]++;
2456 if (!vc->vc_par[1])
2457 vc->vc_par[1] = vc->vc_rows;
2458 /* Minimum allowed region is 2 lines */
2459 if (vc->vc_par[0] < vc->vc_par[1] &&
2460 vc->vc_par[1] <= vc->vc_rows) {
2461 vc->vc_top = vc->vc_par[0] - 1;
2462 vc->vc_bottom = vc->vc_par[1];
2463 gotoxay(vc, 0, 0);
2464 }
2465 return;
2466 case 's':
2467 save_cur(vc);
2468 return;
2469 case 'u':
2470 restore_cur(vc);
2471 return;
2472 case 'X':
2473 csi_X(vc, vc->vc_par[0]);
2474 return;
2475 case '@':
2476 csi_at(vc, vc->vc_par[0]);
2477 return;
2478 case ']': /* setterm functions */
2479 setterm_command(vc);
2480 return;
2481 }
2482 return;
2483 case EScsiignore:
2484 if (c >= 20 && c <= 0x3f)
2485 return;
2486 vc->vc_state = ESnormal;
2487 return;
2488 case ESpercent:
2489 vc->vc_state = ESnormal;
2490 switch (c) {
2491 case '@': /* defined in ISO 2022 */
2492 vc->vc_utf = 0;
2493 return;
2494 case 'G': /* prelim official escape code */
2495 case '8': /* retained for compatibility */
2496 vc->vc_utf = 1;
2497 return;
2498 }
2499 return;
2500 case ESfunckey:
2501 vc->vc_state = ESnormal;
2502 return;
2503 case EShash:
2504 vc->vc_state = ESnormal;
2505 if (c == '8') {
2506 /* DEC screen alignment test. kludge :-) */
2507 vc->vc_video_erase_char =
2508 (vc->vc_video_erase_char & 0xff00) | 'E';
2509 csi_J(vc, 2);
2510 vc->vc_video_erase_char =
2511 (vc->vc_video_erase_char & 0xff00) | ' ';
2512 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2513 }
2514 return;
2515 case ESsetG0:
2516 vc_setGx(vc, 0, c);
2517 vc->vc_state = ESnormal;
2518 return;
2519 case ESsetG1:
2520 vc_setGx(vc, 1, c);
2521 vc->vc_state = ESnormal;
2522 return;
2523 case ESosc:
2524 return;
2525 default:
2526 vc->vc_state = ESnormal;
2527 }
2528 }
2529
2530 /* is_double_width() is based on the wcwidth() implementation by
2531 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2532 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2533 */
2534 struct interval {
2535 uint32_t first;
2536 uint32_t last;
2537 };
2538
2539 static int ucs_cmp(const void *key, const void *elt)
2540 {
2541 uint32_t ucs = *(uint32_t *)key;
2542 struct interval e = *(struct interval *) elt;
2543
2544 if (ucs > e.last)
2545 return 1;
2546 else if (ucs < e.first)
2547 return -1;
2548 return 0;
2549 }
2550
2551 static int is_double_width(uint32_t ucs)
2552 {
2553 static const struct interval double_width[] = {
2554 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2555 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2556 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2557 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2558 };
2559 if (ucs < double_width[0].first ||
2560 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2561 return 0;
2562
2563 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2564 sizeof(struct interval), ucs_cmp) != NULL;
2565 }
2566
2567 struct vc_draw_region {
2568 unsigned long from, to;
2569 int x;
2570 };
2571
2572 static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2573 {
2574 if (draw->x < 0)
2575 return;
2576
2577 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2578 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2579 draw->x);
2580 draw->x = -1;
2581 }
2582
2583 static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2584 {
2585 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2586 if (vc->vc_toggle_meta)
2587 c |= 0x80;
2588
2589 return vc->vc_translate[c];
2590 }
2591
2592 return c;
2593 }
2594
2595
2596 /**
2597 * vc_sanitize_unicode -- Replace invalid Unicode code points with U+FFFD
2598 * @c: the received character, or U+FFFD for invalid sequences.
2599 */
2600 static inline int vc_sanitize_unicode(const int c)
2601 {
2602 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2603 return 0xfffd;
2604
2605 return c;
2606 }
2607
2608 /**
2609 * vc_translate_unicode -- Combine UTF-8 into Unicode in @vc_utf_char
2610 * @vc: virtual console
2611 * @c: character to translate
2612 * @rescan: we return true if we need more (continuation) data
2613 *
2614 * @vc_utf_char is the being-constructed unicode character.
2615 * @vc_utf_count is the number of continuation bytes still expected to arrive.
2616 * @vc_npar is the number of continuation bytes arrived so far.
2617 */
2618 static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2619 {
2620 static const u32 utf8_length_changes[] = {
2621 0x0000007f, 0x000007ff, 0x0000ffff,
2622 0x001fffff, 0x03ffffff, 0x7fffffff
2623 };
2624
2625 /* Continuation byte received */
2626 if ((c & 0xc0) == 0x80) {
2627 /* Unexpected continuation byte? */
2628 if (!vc->vc_utf_count)
2629 return 0xfffd;
2630
2631 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2632 vc->vc_npar++;
2633 if (--vc->vc_utf_count)
2634 goto need_more_bytes;
2635
2636 /* Got a whole character */
2637 c = vc->vc_utf_char;
2638 /* Reject overlong sequences */
2639 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2640 c > utf8_length_changes[vc->vc_npar])
2641 return 0xfffd;
2642
2643 return vc_sanitize_unicode(c);
2644 }
2645
2646 /* Single ASCII byte or first byte of a sequence received */
2647 if (vc->vc_utf_count) {
2648 /* Continuation byte expected */
2649 *rescan = true;
2650 vc->vc_utf_count = 0;
2651 return 0xfffd;
2652 }
2653
2654 /* Nothing to do if an ASCII byte was received */
2655 if (c <= 0x7f)
2656 return c;
2657
2658 /* First byte of a multibyte sequence received */
2659 vc->vc_npar = 0;
2660 if ((c & 0xe0) == 0xc0) {
2661 vc->vc_utf_count = 1;
2662 vc->vc_utf_char = (c & 0x1f);
2663 } else if ((c & 0xf0) == 0xe0) {
2664 vc->vc_utf_count = 2;
2665 vc->vc_utf_char = (c & 0x0f);
2666 } else if ((c & 0xf8) == 0xf0) {
2667 vc->vc_utf_count = 3;
2668 vc->vc_utf_char = (c & 0x07);
2669 } else if ((c & 0xfc) == 0xf8) {
2670 vc->vc_utf_count = 4;
2671 vc->vc_utf_char = (c & 0x03);
2672 } else if ((c & 0xfe) == 0xfc) {
2673 vc->vc_utf_count = 5;
2674 vc->vc_utf_char = (c & 0x01);
2675 } else {
2676 /* 254 and 255 are invalid */
2677 return 0xfffd;
2678 }
2679
2680 need_more_bytes:
2681 return -1;
2682 }
2683
2684 static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2685 {
2686 /* Do no translation at all in control states */
2687 if (vc->vc_state != ESnormal)
2688 return *c;
2689
2690 if (vc->vc_utf && !vc->vc_disp_ctrl)
2691 return *c = vc_translate_unicode(vc, *c, rescan);
2692
2693 /* no utf or alternate charset mode */
2694 return vc_translate_ascii(vc, *c);
2695 }
2696
2697 static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2698 {
2699 if (!vc->vc_can_do_color)
2700 return vc->vc_attr ^ 0x08;
2701
2702 if (vc->vc_hi_font_mask == 0x100)
2703 return (vc->vc_attr & 0x11) |
2704 ((vc->vc_attr & 0xe0) >> 4) |
2705 ((vc->vc_attr & 0x0e) << 4);
2706
2707 return (vc->vc_attr & 0x88) |
2708 ((vc->vc_attr & 0x70) >> 4) |
2709 ((vc->vc_attr & 0x07) << 4);
2710 }
2711
2712 static bool vc_is_control(struct vc_data *vc, int tc, int c)
2713 {
2714 /*
2715 * A bitmap for codes <32. A bit of 1 indicates that the code
2716 * corresponding to that bit number invokes some special action (such
2717 * as cursor movement) and should not be displayed as a glyph unless
2718 * the disp_ctrl mode is explicitly enabled.
2719 */
2720 static const u32 CTRL_ACTION = 0x0d00ff81;
2721 /* Cannot be overridden by disp_ctrl */
2722 static const u32 CTRL_ALWAYS = 0x0800f501;
2723
2724 if (vc->vc_state != ESnormal)
2725 return true;
2726
2727 if (!tc)
2728 return true;
2729
2730 /*
2731 * If the original code was a control character we only allow a glyph
2732 * to be displayed if the code is not normally used (such as for cursor
2733 * movement) or if the disp_ctrl mode has been explicitly enabled.
2734 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2735 * displayed as control characters, as the console would be pretty
2736 * useless without them; to display an arbitrary font position use the
2737 * direct-to-font zone in UTF-8 mode.
2738 */
2739 if (c < 32) {
2740 if (vc->vc_disp_ctrl)
2741 return CTRL_ALWAYS & BIT(c);
2742 else
2743 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2744 }
2745
2746 if (c == 127 && !vc->vc_disp_ctrl)
2747 return true;
2748
2749 if (c == 128 + 27)
2750 return true;
2751
2752 return false;
2753 }
2754
2755 static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2756 struct vc_draw_region *draw)
2757 {
2758 int next_c;
2759 unsigned char vc_attr = vc->vc_attr;
2760 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2761 u8 width = 1;
2762 bool inverse = false;
2763
2764 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2765 if (is_double_width(c))
2766 width = 2;
2767 }
2768
2769 /* Now try to find out how to display it */
2770 tc = conv_uni_to_pc(vc, tc);
2771 if (tc & ~charmask) {
2772 if (tc == -1 || tc == -2)
2773 return -1; /* nothing to display */
2774
2775 /* Glyph not found */
2776 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
2777 !(c & ~charmask)) {
2778 /*
2779 * In legacy mode use the glyph we get by a 1:1
2780 * mapping.
2781 * This would make absolutely no sense with Unicode in
2782 * mind, but do this for ASCII characters since a font
2783 * may lack Unicode mapping info and we don't want to
2784 * end up with having question marks only.
2785 */
2786 tc = c;
2787 } else {
2788 /*
2789 * Display U+FFFD. If it's not found, display an inverse
2790 * question mark.
2791 */
2792 tc = conv_uni_to_pc(vc, 0xfffd);
2793 if (tc < 0) {
2794 inverse = true;
2795 tc = conv_uni_to_pc(vc, '?');
2796 if (tc < 0)
2797 tc = '?';
2798
2799 vc_attr = vc_invert_attr(vc);
2800 con_flush(vc, draw);
2801 }
2802 }
2803 }
2804
2805 next_c = c;
2806 while (1) {
2807 if (vc->vc_need_wrap || vc->vc_decim)
2808 con_flush(vc, draw);
2809 if (vc->vc_need_wrap) {
2810 cr(vc);
2811 lf(vc);
2812 }
2813 if (vc->vc_decim)
2814 insert_char(vc, 1);
2815 vc_uniscr_putc(vc, next_c);
2816
2817 if (himask)
2818 tc = ((tc & 0x100) ? himask : 0) |
2819 (tc & 0xff);
2820 tc |= (vc_attr << 8) & ~himask;
2821
2822 scr_writew(tc, (u16 *)vc->vc_pos);
2823
2824 if (con_should_update(vc) && draw->x < 0) {
2825 draw->x = vc->state.x;
2826 draw->from = vc->vc_pos;
2827 }
2828 if (vc->state.x == vc->vc_cols - 1) {
2829 vc->vc_need_wrap = vc->vc_decawm;
2830 draw->to = vc->vc_pos + 2;
2831 } else {
2832 vc->state.x++;
2833 draw->to = (vc->vc_pos += 2);
2834 }
2835
2836 if (!--width)
2837 break;
2838
2839 /* A space is printed in the second column */
2840 tc = conv_uni_to_pc(vc, ' ');
2841 if (tc < 0)
2842 tc = ' ';
2843 next_c = ' ';
2844 }
2845 notify_write(vc, c);
2846
2847 if (inverse)
2848 con_flush(vc, draw);
2849
2850 return 0;
2851 }
2852
2853 /* acquires console_lock */
2854 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2855 {
2856 struct vc_draw_region draw = {
2857 .x = -1,
2858 };
2859 int c, tc, n = 0;
2860 unsigned int currcons;
2861 struct vc_data *vc;
2862 struct vt_notifier_param param;
2863 bool rescan;
2864
2865 if (in_interrupt())
2866 return count;
2867
2868 console_lock();
2869 vc = tty->driver_data;
2870 if (vc == NULL) {
2871 pr_err("vt: argh, driver_data is NULL !\n");
2872 console_unlock();
2873 return 0;
2874 }
2875
2876 currcons = vc->vc_num;
2877 if (!vc_cons_allocated(currcons)) {
2878 /* could this happen? */
2879 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2880 console_unlock();
2881 return 0;
2882 }
2883
2884
2885 /* undraw cursor first */
2886 if (con_is_fg(vc))
2887 hide_cursor(vc);
2888
2889 param.vc = vc;
2890
2891 while (!tty->stopped && count) {
2892 int orig = *buf;
2893 buf++;
2894 n++;
2895 count--;
2896 rescan_last_byte:
2897 c = orig;
2898 rescan = false;
2899
2900 tc = vc_translate(vc, &c, &rescan);
2901 if (tc == -1)
2902 continue;
2903
2904 param.c = tc;
2905 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2906 &param) == NOTIFY_STOP)
2907 continue;
2908
2909 if (vc_is_control(vc, tc, c)) {
2910 con_flush(vc, &draw);
2911 do_con_trol(tty, vc, orig);
2912 continue;
2913 }
2914
2915 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
2916 continue;
2917
2918 if (rescan)
2919 goto rescan_last_byte;
2920 }
2921 con_flush(vc, &draw);
2922 vc_uniscr_debug_check(vc);
2923 console_conditional_schedule();
2924 notify_update(vc);
2925 console_unlock();
2926 return n;
2927 }
2928
2929 /*
2930 * This is the console switching callback.
2931 *
2932 * Doing console switching in a process context allows
2933 * us to do the switches asynchronously (needed when we want
2934 * to switch due to a keyboard interrupt). Synchronization
2935 * with other console code and prevention of re-entrancy is
2936 * ensured with console_lock.
2937 */
2938 static void console_callback(struct work_struct *ignored)
2939 {
2940 console_lock();
2941
2942 if (want_console >= 0) {
2943 if (want_console != fg_console &&
2944 vc_cons_allocated(want_console)) {
2945 hide_cursor(vc_cons[fg_console].d);
2946 change_console(vc_cons[want_console].d);
2947 /* we only changed when the console had already
2948 been allocated - a new console is not created
2949 in an interrupt routine */
2950 }
2951 want_console = -1;
2952 }
2953 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2954 do_poke_blanked_console = 0;
2955 poke_blanked_console();
2956 }
2957 if (scrollback_delta) {
2958 struct vc_data *vc = vc_cons[fg_console].d;
2959 clear_selection();
2960 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2961 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2962 scrollback_delta = 0;
2963 }
2964 if (blank_timer_expired) {
2965 do_blank_screen(0);
2966 blank_timer_expired = 0;
2967 }
2968 notify_update(vc_cons[fg_console].d);
2969
2970 console_unlock();
2971 }
2972
2973 int set_console(int nr)
2974 {
2975 struct vc_data *vc = vc_cons[fg_console].d;
2976
2977 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2978 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2979
2980 /*
2981 * Console switch will fail in console_callback() or
2982 * change_console() so there is no point scheduling
2983 * the callback
2984 *
2985 * Existing set_console() users don't check the return
2986 * value so this shouldn't break anything
2987 */
2988 return -EINVAL;
2989 }
2990
2991 want_console = nr;
2992 schedule_console_callback();
2993
2994 return 0;
2995 }
2996
2997 struct tty_driver *console_driver;
2998
2999 #ifdef CONFIG_VT_CONSOLE
3000
3001 /**
3002 * vt_kmsg_redirect() - Sets/gets the kernel message console
3003 * @new: The new virtual terminal number or -1 if the console should stay
3004 * unchanged
3005 *
3006 * By default, the kernel messages are always printed on the current virtual
3007 * console. However, the user may modify that default with the
3008 * TIOCL_SETKMSGREDIRECT ioctl call.
3009 *
3010 * This function sets the kernel message console to be @new. It returns the old
3011 * virtual console number. The virtual terminal number 0 (both as parameter and
3012 * return value) means no redirection (i.e. always printed on the currently
3013 * active console).
3014 *
3015 * The parameter -1 means that only the current console is returned, but the
3016 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3017 * case to make the code more understandable.
3018 *
3019 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
3020 * the parameter and always returns 0.
3021 */
3022 int vt_kmsg_redirect(int new)
3023 {
3024 static int kmsg_con;
3025
3026 if (new != -1)
3027 return xchg(&kmsg_con, new);
3028 else
3029 return kmsg_con;
3030 }
3031
3032 /*
3033 * Console on virtual terminal
3034 *
3035 * The console must be locked when we get here.
3036 */
3037
3038 static void vt_console_print(struct console *co, const char *b, unsigned count)
3039 {
3040 struct vc_data *vc = vc_cons[fg_console].d;
3041 unsigned char c;
3042 static DEFINE_SPINLOCK(printing_lock);
3043 const ushort *start;
3044 ushort start_x, cnt;
3045 int kmsg_console;
3046
3047 /* console busy or not yet initialized */
3048 if (!printable)
3049 return;
3050 if (!spin_trylock(&printing_lock))
3051 return;
3052
3053 kmsg_console = vt_get_kmsg_redirect();
3054 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3055 vc = vc_cons[kmsg_console - 1].d;
3056
3057 if (!vc_cons_allocated(fg_console)) {
3058 /* impossible */
3059 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3060 goto quit;
3061 }
3062
3063 if (vc->vc_mode != KD_TEXT)
3064 goto quit;
3065
3066 /* undraw cursor first */
3067 if (con_is_fg(vc))
3068 hide_cursor(vc);
3069
3070 start = (ushort *)vc->vc_pos;
3071 start_x = vc->state.x;
3072 cnt = 0;
3073 while (count--) {
3074 c = *b++;
3075 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
3076 if (cnt && con_is_visible(vc))
3077 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3078 cnt = 0;
3079 if (c == 8) { /* backspace */
3080 bs(vc);
3081 start = (ushort *)vc->vc_pos;
3082 start_x = vc->state.x;
3083 continue;
3084 }
3085 if (c != 13)
3086 lf(vc);
3087 cr(vc);
3088 start = (ushort *)vc->vc_pos;
3089 start_x = vc->state.x;
3090 if (c == 10 || c == 13)
3091 continue;
3092 }
3093 vc_uniscr_putc(vc, c);
3094 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3095 notify_write(vc, c);
3096 cnt++;
3097 if (vc->state.x == vc->vc_cols - 1) {
3098 vc->vc_need_wrap = 1;
3099 } else {
3100 vc->vc_pos += 2;
3101 vc->state.x++;
3102 }
3103 }
3104 if (cnt && con_is_visible(vc))
3105 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3106 set_cursor(vc);
3107 notify_update(vc);
3108
3109 quit:
3110 spin_unlock(&printing_lock);
3111 }
3112
3113 static struct tty_driver *vt_console_device(struct console *c, int *index)
3114 {
3115 *index = c->index ? c->index-1 : fg_console;
3116 return console_driver;
3117 }
3118
3119 static struct console vt_console_driver = {
3120 .name = "tty",
3121 .write = vt_console_print,
3122 .device = vt_console_device,
3123 .unblank = unblank_screen,
3124 .flags = CON_PRINTBUFFER,
3125 .index = -1,
3126 };
3127 #endif
3128
3129 /*
3130 * Handling of Linux-specific VC ioctls
3131 */
3132
3133 /*
3134 * Generally a bit racy with respect to console_lock();.
3135 *
3136 * There are some functions which don't need it.
3137 *
3138 * There are some functions which can sleep for arbitrary periods
3139 * (paste_selection) but we don't need the lock there anyway.
3140 *
3141 * set_selection_user has locking, and definitely needs it
3142 */
3143
3144 int tioclinux(struct tty_struct *tty, unsigned long arg)
3145 {
3146 char type, data;
3147 char __user *p = (char __user *)arg;
3148 int lines;
3149 int ret;
3150
3151 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3152 return -EPERM;
3153 if (get_user(type, p))
3154 return -EFAULT;
3155 ret = 0;
3156
3157 switch (type)
3158 {
3159 case TIOCL_SETSEL:
3160 ret = set_selection_user((struct tiocl_selection
3161 __user *)(p+1), tty);
3162 break;
3163 case TIOCL_PASTESEL:
3164 ret = paste_selection(tty);
3165 break;
3166 case TIOCL_UNBLANKSCREEN:
3167 console_lock();
3168 unblank_screen();
3169 console_unlock();
3170 break;
3171 case TIOCL_SELLOADLUT:
3172 console_lock();
3173 ret = sel_loadlut(p);
3174 console_unlock();
3175 break;
3176 case TIOCL_GETSHIFTSTATE:
3177
3178 /*
3179 * Make it possible to react to Shift+Mousebutton.
3180 * Note that 'shift_state' is an undocumented
3181 * kernel-internal variable; programs not closely
3182 * related to the kernel should not use this.
3183 */
3184 data = vt_get_shift_state();
3185 ret = put_user(data, p);
3186 break;
3187 case TIOCL_GETMOUSEREPORTING:
3188 console_lock(); /* May be overkill */
3189 data = mouse_reporting();
3190 console_unlock();
3191 ret = put_user(data, p);
3192 break;
3193 case TIOCL_SETVESABLANK:
3194 console_lock();
3195 ret = set_vesa_blanking(p);
3196 console_unlock();
3197 break;
3198 case TIOCL_GETKMSGREDIRECT:
3199 data = vt_get_kmsg_redirect();
3200 ret = put_user(data, p);
3201 break;
3202 case TIOCL_SETKMSGREDIRECT:
3203 if (!capable(CAP_SYS_ADMIN)) {
3204 ret = -EPERM;
3205 } else {
3206 if (get_user(data, p+1))
3207 ret = -EFAULT;
3208 else
3209 vt_kmsg_redirect(data);
3210 }
3211 break;
3212 case TIOCL_GETFGCONSOLE:
3213 /* No locking needed as this is a transiently
3214 correct return anyway if the caller hasn't
3215 disabled switching */
3216 ret = fg_console;
3217 break;
3218 case TIOCL_SCROLLCONSOLE:
3219 if (get_user(lines, (s32 __user *)(p+4))) {
3220 ret = -EFAULT;
3221 } else {
3222 /* Need the console lock here. Note that lots
3223 of other calls need fixing before the lock
3224 is actually useful ! */
3225 console_lock();
3226 scrollfront(vc_cons[fg_console].d, lines);
3227 console_unlock();
3228 ret = 0;
3229 }
3230 break;
3231 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3232 console_lock();
3233 ignore_poke = 1;
3234 do_blank_screen(0);
3235 console_unlock();
3236 break;
3237 case TIOCL_BLANKEDSCREEN:
3238 ret = console_blanked;
3239 break;
3240 default:
3241 ret = -EINVAL;
3242 break;
3243 }
3244 return ret;
3245 }
3246
3247 /*
3248 * /dev/ttyN handling
3249 */
3250
3251 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3252 {
3253 int retval;
3254
3255 retval = do_con_write(tty, buf, count);
3256 con_flush_chars(tty);
3257
3258 return retval;
3259 }
3260
3261 static int con_put_char(struct tty_struct *tty, unsigned char ch)
3262 {
3263 if (in_interrupt())
3264 return 0; /* n_r3964 calls put_char() from interrupt context */
3265 return do_con_write(tty, &ch, 1);
3266 }
3267
3268 static int con_write_room(struct tty_struct *tty)
3269 {
3270 if (tty->stopped)
3271 return 0;
3272 return 32768; /* No limit, really; we're not buffering */
3273 }
3274
3275 static int con_chars_in_buffer(struct tty_struct *tty)
3276 {
3277 return 0; /* we're not buffering */
3278 }
3279
3280 /*
3281 * con_throttle and con_unthrottle are only used for
3282 * paste_selection(), which has to stuff in a large number of
3283 * characters...
3284 */
3285 static void con_throttle(struct tty_struct *tty)
3286 {
3287 }
3288
3289 static void con_unthrottle(struct tty_struct *tty)
3290 {
3291 struct vc_data *vc = tty->driver_data;
3292
3293 wake_up_interruptible(&vc->paste_wait);
3294 }
3295
3296 /*
3297 * Turn the Scroll-Lock LED on when the tty is stopped
3298 */
3299 static void con_stop(struct tty_struct *tty)
3300 {
3301 int console_num;
3302 if (!tty)
3303 return;
3304 console_num = tty->index;
3305 if (!vc_cons_allocated(console_num))
3306 return;
3307 vt_kbd_con_stop(console_num);
3308 }
3309
3310 /*
3311 * Turn the Scroll-Lock LED off when the console is started
3312 */
3313 static void con_start(struct tty_struct *tty)
3314 {
3315 int console_num;
3316 if (!tty)
3317 return;
3318 console_num = tty->index;
3319 if (!vc_cons_allocated(console_num))
3320 return;
3321 vt_kbd_con_start(console_num);
3322 }
3323
3324 static void con_flush_chars(struct tty_struct *tty)
3325 {
3326 struct vc_data *vc;
3327
3328 if (in_interrupt()) /* from flush_to_ldisc */
3329 return;
3330
3331 /* if we race with con_close(), vt may be null */
3332 console_lock();
3333 vc = tty->driver_data;
3334 if (vc)
3335 set_cursor(vc);
3336 console_unlock();
3337 }
3338
3339 /*
3340 * Allocate the console screen memory.
3341 */
3342 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3343 {
3344 unsigned int currcons = tty->index;
3345 struct vc_data *vc;
3346 int ret;
3347
3348 console_lock();
3349 ret = vc_allocate(currcons);
3350 if (ret)
3351 goto unlock;
3352
3353 vc = vc_cons[currcons].d;
3354
3355 /* Still being freed */
3356 if (vc->port.tty) {
3357 ret = -ERESTARTSYS;
3358 goto unlock;
3359 }
3360
3361 ret = tty_port_install(&vc->port, driver, tty);
3362 if (ret)
3363 goto unlock;
3364
3365 tty->driver_data = vc;
3366 vc->port.tty = tty;
3367 tty_port_get(&vc->port);
3368
3369 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3370 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3371 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3372 }
3373 if (vc->vc_utf)
3374 tty->termios.c_iflag |= IUTF8;
3375 else
3376 tty->termios.c_iflag &= ~IUTF8;
3377 unlock:
3378 console_unlock();
3379 return ret;
3380 }
3381
3382 static int con_open(struct tty_struct *tty, struct file *filp)
3383 {
3384 /* everything done in install */
3385 return 0;
3386 }
3387
3388
3389 static void con_close(struct tty_struct *tty, struct file *filp)
3390 {
3391 /* Nothing to do - we defer to shutdown */
3392 }
3393
3394 static void con_shutdown(struct tty_struct *tty)
3395 {
3396 struct vc_data *vc = tty->driver_data;
3397 BUG_ON(vc == NULL);
3398 console_lock();
3399 vc->port.tty = NULL;
3400 console_unlock();
3401 }
3402
3403 static void con_cleanup(struct tty_struct *tty)
3404 {
3405 struct vc_data *vc = tty->driver_data;
3406
3407 tty_port_put(&vc->port);
3408 }
3409
3410 static int default_color = 7; /* white */
3411 static int default_italic_color = 2; // green (ASCII)
3412 static int default_underline_color = 3; // cyan (ASCII)
3413 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3414 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3415 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3416
3417 static void vc_init(struct vc_data *vc, unsigned int rows,
3418 unsigned int cols, int do_clear)
3419 {
3420 int j, k ;
3421
3422 vc->vc_cols = cols;
3423 vc->vc_rows = rows;
3424 vc->vc_size_row = cols << 1;
3425 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3426
3427 set_origin(vc);
3428 vc->vc_pos = vc->vc_origin;
3429 reset_vc(vc);
3430 for (j=k=0; j<16; j++) {
3431 vc->vc_palette[k++] = default_red[j] ;
3432 vc->vc_palette[k++] = default_grn[j] ;
3433 vc->vc_palette[k++] = default_blu[j] ;
3434 }
3435 vc->vc_def_color = default_color;
3436 vc->vc_ulcolor = default_underline_color;
3437 vc->vc_itcolor = default_italic_color;
3438 vc->vc_halfcolor = 0x08; /* grey */
3439 init_waitqueue_head(&vc->paste_wait);
3440 reset_terminal(vc, do_clear);
3441 }
3442
3443 /*
3444 * This routine initializes console interrupts, and does nothing
3445 * else. If you want the screen to clear, call tty_write with
3446 * the appropriate escape-sequence.
3447 */
3448
3449 static int __init con_init(void)
3450 {
3451 const char *display_desc = NULL;
3452 struct vc_data *vc;
3453 unsigned int currcons = 0, i;
3454
3455 console_lock();
3456
3457 if (!conswitchp)
3458 conswitchp = &dummy_con;
3459 display_desc = conswitchp->con_startup();
3460 if (!display_desc) {
3461 fg_console = 0;
3462 console_unlock();
3463 return 0;
3464 }
3465
3466 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3467 struct con_driver *con_driver = &registered_con_driver[i];
3468
3469 if (con_driver->con == NULL) {
3470 con_driver->con = conswitchp;
3471 con_driver->desc = display_desc;
3472 con_driver->flag = CON_DRIVER_FLAG_INIT;
3473 con_driver->first = 0;
3474 con_driver->last = MAX_NR_CONSOLES - 1;
3475 break;
3476 }
3477 }
3478
3479 for (i = 0; i < MAX_NR_CONSOLES; i++)
3480 con_driver_map[i] = conswitchp;
3481
3482 if (blankinterval) {
3483 blank_state = blank_normal_wait;
3484 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3485 }
3486
3487 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3488 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3489 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3490 tty_port_init(&vc->port);
3491 visual_init(vc, currcons, 1);
3492 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3493 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3494 vc_init(vc, vc->vc_rows, vc->vc_cols,
3495 currcons || !vc->vc_sw->con_save_screen);
3496 }
3497 currcons = fg_console = 0;
3498 master_display_fg = vc = vc_cons[currcons].d;
3499 set_origin(vc);
3500 save_screen(vc);
3501 gotoxy(vc, vc->state.x, vc->state.y);
3502 csi_J(vc, 0);
3503 update_screen(vc);
3504 pr_info("Console: %s %s %dx%d\n",
3505 vc->vc_can_do_color ? "colour" : "mono",
3506 display_desc, vc->vc_cols, vc->vc_rows);
3507 printable = 1;
3508
3509 console_unlock();
3510
3511 #ifdef CONFIG_VT_CONSOLE
3512 register_console(&vt_console_driver);
3513 #endif
3514 return 0;
3515 }
3516 console_initcall(con_init);
3517
3518 static const struct tty_operations con_ops = {
3519 .install = con_install,
3520 .open = con_open,
3521 .close = con_close,
3522 .write = con_write,
3523 .write_room = con_write_room,
3524 .put_char = con_put_char,
3525 .flush_chars = con_flush_chars,
3526 .chars_in_buffer = con_chars_in_buffer,
3527 .ioctl = vt_ioctl,
3528 #ifdef CONFIG_COMPAT
3529 .compat_ioctl = vt_compat_ioctl,
3530 #endif
3531 .stop = con_stop,
3532 .start = con_start,
3533 .throttle = con_throttle,
3534 .unthrottle = con_unthrottle,
3535 .resize = vt_resize,
3536 .shutdown = con_shutdown,
3537 .cleanup = con_cleanup,
3538 };
3539
3540 static struct cdev vc0_cdev;
3541
3542 static ssize_t show_tty_active(struct device *dev,
3543 struct device_attribute *attr, char *buf)
3544 {
3545 return sprintf(buf, "tty%d\n", fg_console + 1);
3546 }
3547 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3548
3549 static struct attribute *vt_dev_attrs[] = {
3550 &dev_attr_active.attr,
3551 NULL
3552 };
3553
3554 ATTRIBUTE_GROUPS(vt_dev);
3555
3556 int __init vty_init(const struct file_operations *console_fops)
3557 {
3558 cdev_init(&vc0_cdev, console_fops);
3559 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3560 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3561 panic("Couldn't register /dev/tty0 driver\n");
3562 tty0dev = device_create_with_groups(tty_class, NULL,
3563 MKDEV(TTY_MAJOR, 0), NULL,
3564 vt_dev_groups, "tty0");
3565 if (IS_ERR(tty0dev))
3566 tty0dev = NULL;
3567
3568 vcs_init();
3569
3570 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3571 if (!console_driver)
3572 panic("Couldn't allocate console driver\n");
3573
3574 console_driver->name = "tty";
3575 console_driver->name_base = 1;
3576 console_driver->major = TTY_MAJOR;
3577 console_driver->minor_start = 1;
3578 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3579 console_driver->init_termios = tty_std_termios;
3580 if (default_utf8)
3581 console_driver->init_termios.c_iflag |= IUTF8;
3582 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3583 tty_set_operations(console_driver, &con_ops);
3584 if (tty_register_driver(console_driver))
3585 panic("Couldn't register console driver\n");
3586 kbd_init();
3587 console_map_init();
3588 #ifdef CONFIG_MDA_CONSOLE
3589 mda_console_init();
3590 #endif
3591 return 0;
3592 }
3593
3594 #ifndef VT_SINGLE_DRIVER
3595
3596 static struct class *vtconsole_class;
3597
3598 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3599 int deflt)
3600 {
3601 struct module *owner = csw->owner;
3602 const char *desc = NULL;
3603 struct con_driver *con_driver;
3604 int i, j = -1, k = -1, retval = -ENODEV;
3605
3606 if (!try_module_get(owner))
3607 return -ENODEV;
3608
3609 WARN_CONSOLE_UNLOCKED();
3610
3611 /* check if driver is registered */
3612 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3613 con_driver = &registered_con_driver[i];
3614
3615 if (con_driver->con == csw) {
3616 desc = con_driver->desc;
3617 retval = 0;
3618 break;
3619 }
3620 }
3621
3622 if (retval)
3623 goto err;
3624
3625 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3626 csw->con_startup();
3627 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3628 }
3629
3630 if (deflt) {
3631 if (conswitchp)
3632 module_put(conswitchp->owner);
3633
3634 __module_get(owner);
3635 conswitchp = csw;
3636 }
3637
3638 first = max(first, con_driver->first);
3639 last = min(last, con_driver->last);
3640
3641 for (i = first; i <= last; i++) {
3642 int old_was_color;
3643 struct vc_data *vc = vc_cons[i].d;
3644
3645 if (con_driver_map[i])
3646 module_put(con_driver_map[i]->owner);
3647 __module_get(owner);
3648 con_driver_map[i] = csw;
3649
3650 if (!vc || !vc->vc_sw)
3651 continue;
3652
3653 j = i;
3654
3655 if (con_is_visible(vc)) {
3656 k = i;
3657 save_screen(vc);
3658 }
3659
3660 old_was_color = vc->vc_can_do_color;
3661 vc->vc_sw->con_deinit(vc);
3662 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3663 visual_init(vc, i, 0);
3664 set_origin(vc);
3665 update_attr(vc);
3666
3667 /* If the console changed between mono <-> color, then
3668 * the attributes in the screenbuf will be wrong. The
3669 * following resets all attributes to something sane.
3670 */
3671 if (old_was_color != vc->vc_can_do_color)
3672 clear_buffer_attributes(vc);
3673 }
3674
3675 pr_info("Console: switching ");
3676 if (!deflt)
3677 pr_cont("consoles %d-%d ", first + 1, last + 1);
3678 if (j >= 0) {
3679 struct vc_data *vc = vc_cons[j].d;
3680
3681 pr_cont("to %s %s %dx%d\n",
3682 vc->vc_can_do_color ? "colour" : "mono",
3683 desc, vc->vc_cols, vc->vc_rows);
3684
3685 if (k >= 0) {
3686 vc = vc_cons[k].d;
3687 update_screen(vc);
3688 }
3689 } else {
3690 pr_cont("to %s\n", desc);
3691 }
3692
3693 retval = 0;
3694 err:
3695 module_put(owner);
3696 return retval;
3697 };
3698
3699
3700 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3701 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3702 {
3703 struct module *owner = csw->owner;
3704 const struct consw *defcsw = NULL;
3705 struct con_driver *con_driver = NULL, *con_back = NULL;
3706 int i, retval = -ENODEV;
3707
3708 if (!try_module_get(owner))
3709 return -ENODEV;
3710
3711 WARN_CONSOLE_UNLOCKED();
3712
3713 /* check if driver is registered and if it is unbindable */
3714 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3715 con_driver = &registered_con_driver[i];
3716
3717 if (con_driver->con == csw &&
3718 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3719 retval = 0;
3720 break;
3721 }
3722 }
3723
3724 if (retval)
3725 goto err;
3726
3727 retval = -ENODEV;
3728
3729 /* check if backup driver exists */
3730 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3731 con_back = &registered_con_driver[i];
3732
3733 if (con_back->con && con_back->con != csw) {
3734 defcsw = con_back->con;
3735 retval = 0;
3736 break;
3737 }
3738 }
3739
3740 if (retval)
3741 goto err;
3742
3743 if (!con_is_bound(csw))
3744 goto err;
3745
3746 first = max(first, con_driver->first);
3747 last = min(last, con_driver->last);
3748
3749 for (i = first; i <= last; i++) {
3750 if (con_driver_map[i] == csw) {
3751 module_put(csw->owner);
3752 con_driver_map[i] = NULL;
3753 }
3754 }
3755
3756 if (!con_is_bound(defcsw)) {
3757 const struct consw *defconsw = conswitchp;
3758
3759 defcsw->con_startup();
3760 con_back->flag |= CON_DRIVER_FLAG_INIT;
3761 /*
3762 * vgacon may change the default driver to point
3763 * to dummycon, we restore it here...
3764 */
3765 conswitchp = defconsw;
3766 }
3767
3768 if (!con_is_bound(csw))
3769 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3770
3771 /* ignore return value, binding should not fail */
3772 do_bind_con_driver(defcsw, first, last, deflt);
3773 err:
3774 module_put(owner);
3775 return retval;
3776
3777 }
3778 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3779
3780 static int vt_bind(struct con_driver *con)
3781 {
3782 const struct consw *defcsw = NULL, *csw = NULL;
3783 int i, more = 1, first = -1, last = -1, deflt = 0;
3784
3785 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3786 goto err;
3787
3788 csw = con->con;
3789
3790 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3791 struct con_driver *con = &registered_con_driver[i];
3792
3793 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3794 defcsw = con->con;
3795 break;
3796 }
3797 }
3798
3799 if (!defcsw)
3800 goto err;
3801
3802 while (more) {
3803 more = 0;
3804
3805 for (i = con->first; i <= con->last; i++) {
3806 if (con_driver_map[i] == defcsw) {
3807 if (first == -1)
3808 first = i;
3809 last = i;
3810 more = 1;
3811 } else if (first != -1)
3812 break;
3813 }
3814
3815 if (first == 0 && last == MAX_NR_CONSOLES -1)
3816 deflt = 1;
3817
3818 if (first != -1)
3819 do_bind_con_driver(csw, first, last, deflt);
3820
3821 first = -1;
3822 last = -1;
3823 deflt = 0;
3824 }
3825
3826 err:
3827 return 0;
3828 }
3829
3830 static int vt_unbind(struct con_driver *con)
3831 {
3832 const struct consw *csw = NULL;
3833 int i, more = 1, first = -1, last = -1, deflt = 0;
3834 int ret;
3835
3836 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3837 goto err;
3838
3839 csw = con->con;
3840
3841 while (more) {
3842 more = 0;
3843
3844 for (i = con->first; i <= con->last; i++) {
3845 if (con_driver_map[i] == csw) {
3846 if (first == -1)
3847 first = i;
3848 last = i;
3849 more = 1;
3850 } else if (first != -1)
3851 break;
3852 }
3853
3854 if (first == 0 && last == MAX_NR_CONSOLES -1)
3855 deflt = 1;
3856
3857 if (first != -1) {
3858 ret = do_unbind_con_driver(csw, first, last, deflt);
3859 if (ret != 0)
3860 return ret;
3861 }
3862
3863 first = -1;
3864 last = -1;
3865 deflt = 0;
3866 }
3867
3868 err:
3869 return 0;
3870 }
3871 #else
3872 static inline int vt_bind(struct con_driver *con)
3873 {
3874 return 0;
3875 }
3876 static inline int vt_unbind(struct con_driver *con)
3877 {
3878 return 0;
3879 }
3880 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3881
3882 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3883 const char *buf, size_t count)
3884 {
3885 struct con_driver *con = dev_get_drvdata(dev);
3886 int bind = simple_strtoul(buf, NULL, 0);
3887
3888 console_lock();
3889
3890 if (bind)
3891 vt_bind(con);
3892 else
3893 vt_unbind(con);
3894
3895 console_unlock();
3896
3897 return count;
3898 }
3899
3900 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3901 char *buf)
3902 {
3903 struct con_driver *con = dev_get_drvdata(dev);
3904 int bind;
3905
3906 console_lock();
3907 bind = con_is_bound(con->con);
3908 console_unlock();
3909
3910 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3911 }
3912
3913 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3914 char *buf)
3915 {
3916 struct con_driver *con = dev_get_drvdata(dev);
3917
3918 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3919 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3920 con->desc);
3921
3922 }
3923
3924 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3925 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3926
3927 static struct attribute *con_dev_attrs[] = {
3928 &dev_attr_bind.attr,
3929 &dev_attr_name.attr,
3930 NULL
3931 };
3932
3933 ATTRIBUTE_GROUPS(con_dev);
3934
3935 static int vtconsole_init_device(struct con_driver *con)
3936 {
3937 con->flag |= CON_DRIVER_FLAG_ATTR;
3938 return 0;
3939 }
3940
3941 static void vtconsole_deinit_device(struct con_driver *con)
3942 {
3943 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3944 }
3945
3946 /**
3947 * con_is_bound - checks if driver is bound to the console
3948 * @csw: console driver
3949 *
3950 * RETURNS: zero if unbound, nonzero if bound
3951 *
3952 * Drivers can call this and if zero, they should release
3953 * all resources allocated on con_startup()
3954 */
3955 int con_is_bound(const struct consw *csw)
3956 {
3957 int i, bound = 0;
3958
3959 WARN_CONSOLE_UNLOCKED();
3960
3961 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3962 if (con_driver_map[i] == csw) {
3963 bound = 1;
3964 break;
3965 }
3966 }
3967
3968 return bound;
3969 }
3970 EXPORT_SYMBOL(con_is_bound);
3971
3972 /**
3973 * con_is_visible - checks whether the current console is visible
3974 * @vc: virtual console
3975 *
3976 * RETURNS: zero if not visible, nonzero if visible
3977 */
3978 bool con_is_visible(const struct vc_data *vc)
3979 {
3980 WARN_CONSOLE_UNLOCKED();
3981
3982 return *vc->vc_display_fg == vc;
3983 }
3984 EXPORT_SYMBOL(con_is_visible);
3985
3986 /**
3987 * con_debug_enter - prepare the console for the kernel debugger
3988 * @vc: virtual console
3989 *
3990 * Called when the console is taken over by the kernel debugger, this
3991 * function needs to save the current console state, then put the console
3992 * into a state suitable for the kernel debugger.
3993 *
3994 * RETURNS:
3995 * Zero on success, nonzero if a failure occurred when trying to prepare
3996 * the console for the debugger.
3997 */
3998 int con_debug_enter(struct vc_data *vc)
3999 {
4000 int ret = 0;
4001
4002 saved_fg_console = fg_console;
4003 saved_last_console = last_console;
4004 saved_want_console = want_console;
4005 saved_vc_mode = vc->vc_mode;
4006 saved_console_blanked = console_blanked;
4007 vc->vc_mode = KD_TEXT;
4008 console_blanked = 0;
4009 if (vc->vc_sw->con_debug_enter)
4010 ret = vc->vc_sw->con_debug_enter(vc);
4011 #ifdef CONFIG_KGDB_KDB
4012 /* Set the initial LINES variable if it is not already set */
4013 if (vc->vc_rows < 999) {
4014 int linecount;
4015 char lns[4];
4016 const char *setargs[3] = {
4017 "set",
4018 "LINES",
4019 lns,
4020 };
4021 if (kdbgetintenv(setargs[0], &linecount)) {
4022 snprintf(lns, 4, "%i", vc->vc_rows);
4023 kdb_set(2, setargs);
4024 }
4025 }
4026 if (vc->vc_cols < 999) {
4027 int colcount;
4028 char cols[4];
4029 const char *setargs[3] = {
4030 "set",
4031 "COLUMNS",
4032 cols,
4033 };
4034 if (kdbgetintenv(setargs[0], &colcount)) {
4035 snprintf(cols, 4, "%i", vc->vc_cols);
4036 kdb_set(2, setargs);
4037 }
4038 }
4039 #endif /* CONFIG_KGDB_KDB */
4040 return ret;
4041 }
4042 EXPORT_SYMBOL_GPL(con_debug_enter);
4043
4044 /**
4045 * con_debug_leave - restore console state
4046 *
4047 * Restore the console state to what it was before the kernel debugger
4048 * was invoked.
4049 *
4050 * RETURNS:
4051 * Zero on success, nonzero if a failure occurred when trying to restore
4052 * the console.
4053 */
4054 int con_debug_leave(void)
4055 {
4056 struct vc_data *vc;
4057 int ret = 0;
4058
4059 fg_console = saved_fg_console;
4060 last_console = saved_last_console;
4061 want_console = saved_want_console;
4062 console_blanked = saved_console_blanked;
4063 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4064
4065 vc = vc_cons[fg_console].d;
4066 if (vc->vc_sw->con_debug_leave)
4067 ret = vc->vc_sw->con_debug_leave(vc);
4068 return ret;
4069 }
4070 EXPORT_SYMBOL_GPL(con_debug_leave);
4071
4072 static int do_register_con_driver(const struct consw *csw, int first, int last)
4073 {
4074 struct module *owner = csw->owner;
4075 struct con_driver *con_driver;
4076 const char *desc;
4077 int i, retval;
4078
4079 WARN_CONSOLE_UNLOCKED();
4080
4081 if (!try_module_get(owner))
4082 return -ENODEV;
4083
4084 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4085 con_driver = &registered_con_driver[i];
4086
4087 /* already registered */
4088 if (con_driver->con == csw) {
4089 retval = -EBUSY;
4090 goto err;
4091 }
4092 }
4093
4094 desc = csw->con_startup();
4095 if (!desc) {
4096 retval = -ENODEV;
4097 goto err;
4098 }
4099
4100 retval = -EINVAL;
4101
4102 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4103 con_driver = &registered_con_driver[i];
4104
4105 if (con_driver->con == NULL &&
4106 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4107 con_driver->con = csw;
4108 con_driver->desc = desc;
4109 con_driver->node = i;
4110 con_driver->flag = CON_DRIVER_FLAG_MODULE |
4111 CON_DRIVER_FLAG_INIT;
4112 con_driver->first = first;
4113 con_driver->last = last;
4114 retval = 0;
4115 break;
4116 }
4117 }
4118
4119 if (retval)
4120 goto err;
4121
4122 con_driver->dev =
4123 device_create_with_groups(vtconsole_class, NULL,
4124 MKDEV(0, con_driver->node),
4125 con_driver, con_dev_groups,
4126 "vtcon%i", con_driver->node);
4127 if (IS_ERR(con_driver->dev)) {
4128 pr_warn("Unable to create device for %s; errno = %ld\n",
4129 con_driver->desc, PTR_ERR(con_driver->dev));
4130 con_driver->dev = NULL;
4131 } else {
4132 vtconsole_init_device(con_driver);
4133 }
4134
4135 err:
4136 module_put(owner);
4137 return retval;
4138 }
4139
4140
4141 /**
4142 * do_unregister_con_driver - unregister console driver from console layer
4143 * @csw: console driver
4144 *
4145 * DESCRIPTION: All drivers that registers to the console layer must
4146 * call this function upon exit, or if the console driver is in a state
4147 * where it won't be able to handle console services, such as the
4148 * framebuffer console without loaded framebuffer drivers.
4149 *
4150 * The driver must unbind first prior to unregistration.
4151 */
4152 int do_unregister_con_driver(const struct consw *csw)
4153 {
4154 int i;
4155
4156 /* cannot unregister a bound driver */
4157 if (con_is_bound(csw))
4158 return -EBUSY;
4159
4160 if (csw == conswitchp)
4161 return -EINVAL;
4162
4163 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4164 struct con_driver *con_driver = &registered_con_driver[i];
4165
4166 if (con_driver->con == csw) {
4167 /*
4168 * Defer the removal of the sysfs entries since that
4169 * will acquire the kernfs s_active lock and we can't
4170 * acquire this lock while holding the console lock:
4171 * the unbind sysfs entry imposes already the opposite
4172 * order. Reset con already here to prevent any later
4173 * lookup to succeed and mark this slot as zombie, so
4174 * it won't get reused until we complete the removal
4175 * in the deferred work.
4176 */
4177 con_driver->con = NULL;
4178 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4179 schedule_work(&con_driver_unregister_work);
4180
4181 return 0;
4182 }
4183 }
4184
4185 return -ENODEV;
4186 }
4187 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4188
4189 static void con_driver_unregister_callback(struct work_struct *ignored)
4190 {
4191 int i;
4192
4193 console_lock();
4194
4195 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4196 struct con_driver *con_driver = &registered_con_driver[i];
4197
4198 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4199 continue;
4200
4201 console_unlock();
4202
4203 vtconsole_deinit_device(con_driver);
4204 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4205
4206 console_lock();
4207
4208 if (WARN_ON_ONCE(con_driver->con))
4209 con_driver->con = NULL;
4210 con_driver->desc = NULL;
4211 con_driver->dev = NULL;
4212 con_driver->node = 0;
4213 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4214 con_driver->flag = 0;
4215 con_driver->first = 0;
4216 con_driver->last = 0;
4217 }
4218
4219 console_unlock();
4220 }
4221
4222 /*
4223 * If we support more console drivers, this function is used
4224 * when a driver wants to take over some existing consoles
4225 * and become default driver for newly opened ones.
4226 *
4227 * do_take_over_console is basically a register followed by bind
4228 */
4229 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4230 {
4231 int err;
4232
4233 err = do_register_con_driver(csw, first, last);
4234 /*
4235 * If we get an busy error we still want to bind the console driver
4236 * and return success, as we may have unbound the console driver
4237 * but not unregistered it.
4238 */
4239 if (err == -EBUSY)
4240 err = 0;
4241 if (!err)
4242 do_bind_con_driver(csw, first, last, deflt);
4243
4244 return err;
4245 }
4246 EXPORT_SYMBOL_GPL(do_take_over_console);
4247
4248
4249 /*
4250 * give_up_console is a wrapper to unregister_con_driver. It will only
4251 * work if driver is fully unbound.
4252 */
4253 void give_up_console(const struct consw *csw)
4254 {
4255 console_lock();
4256 do_unregister_con_driver(csw);
4257 console_unlock();
4258 }
4259
4260 static int __init vtconsole_class_init(void)
4261 {
4262 int i;
4263
4264 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4265 if (IS_ERR(vtconsole_class)) {
4266 pr_warn("Unable to create vt console class; errno = %ld\n",
4267 PTR_ERR(vtconsole_class));
4268 vtconsole_class = NULL;
4269 }
4270
4271 /* Add system drivers to sysfs */
4272 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4273 struct con_driver *con = &registered_con_driver[i];
4274
4275 if (con->con && !con->dev) {
4276 con->dev =
4277 device_create_with_groups(vtconsole_class, NULL,
4278 MKDEV(0, con->node),
4279 con, con_dev_groups,
4280 "vtcon%i", con->node);
4281
4282 if (IS_ERR(con->dev)) {
4283 pr_warn("Unable to create device for %s; errno = %ld\n",
4284 con->desc, PTR_ERR(con->dev));
4285 con->dev = NULL;
4286 } else {
4287 vtconsole_init_device(con);
4288 }
4289 }
4290 }
4291
4292 return 0;
4293 }
4294 postcore_initcall(vtconsole_class_init);
4295
4296 #endif
4297
4298 /*
4299 * Screen blanking
4300 */
4301
4302 static int set_vesa_blanking(char __user *p)
4303 {
4304 unsigned int mode;
4305
4306 if (get_user(mode, p + 1))
4307 return -EFAULT;
4308
4309 vesa_blank_mode = (mode < 4) ? mode : 0;
4310 return 0;
4311 }
4312
4313 void do_blank_screen(int entering_gfx)
4314 {
4315 struct vc_data *vc = vc_cons[fg_console].d;
4316 int i;
4317
4318 might_sleep();
4319
4320 WARN_CONSOLE_UNLOCKED();
4321
4322 if (console_blanked) {
4323 if (blank_state == blank_vesa_wait) {
4324 blank_state = blank_off;
4325 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4326 }
4327 return;
4328 }
4329
4330 /* entering graphics mode? */
4331 if (entering_gfx) {
4332 hide_cursor(vc);
4333 save_screen(vc);
4334 vc->vc_sw->con_blank(vc, -1, 1);
4335 console_blanked = fg_console + 1;
4336 blank_state = blank_off;
4337 set_origin(vc);
4338 return;
4339 }
4340
4341 blank_state = blank_off;
4342
4343 /* don't blank graphics */
4344 if (vc->vc_mode != KD_TEXT) {
4345 console_blanked = fg_console + 1;
4346 return;
4347 }
4348
4349 hide_cursor(vc);
4350 del_timer_sync(&console_timer);
4351 blank_timer_expired = 0;
4352
4353 save_screen(vc);
4354 /* In case we need to reset origin, blanking hook returns 1 */
4355 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4356 console_blanked = fg_console + 1;
4357 if (i)
4358 set_origin(vc);
4359
4360 if (console_blank_hook && console_blank_hook(1))
4361 return;
4362
4363 if (vesa_off_interval && vesa_blank_mode) {
4364 blank_state = blank_vesa_wait;
4365 mod_timer(&console_timer, jiffies + vesa_off_interval);
4366 }
4367 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4368 }
4369 EXPORT_SYMBOL(do_blank_screen);
4370
4371 /*
4372 * Called by timer as well as from vt_console_driver
4373 */
4374 void do_unblank_screen(int leaving_gfx)
4375 {
4376 struct vc_data *vc;
4377
4378 /* This should now always be called from a "sane" (read: can schedule)
4379 * context for the sake of the low level drivers, except in the special
4380 * case of oops_in_progress
4381 */
4382 if (!oops_in_progress)
4383 might_sleep();
4384
4385 WARN_CONSOLE_UNLOCKED();
4386
4387 ignore_poke = 0;
4388 if (!console_blanked)
4389 return;
4390 if (!vc_cons_allocated(fg_console)) {
4391 /* impossible */
4392 pr_warn("unblank_screen: tty %d not allocated ??\n",
4393 fg_console + 1);
4394 return;
4395 }
4396 vc = vc_cons[fg_console].d;
4397 if (vc->vc_mode != KD_TEXT)
4398 return; /* but leave console_blanked != 0 */
4399
4400 if (blankinterval) {
4401 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4402 blank_state = blank_normal_wait;
4403 }
4404
4405 console_blanked = 0;
4406 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4407 /* Low-level driver cannot restore -> do it ourselves */
4408 update_screen(vc);
4409 if (console_blank_hook)
4410 console_blank_hook(0);
4411 set_palette(vc);
4412 set_cursor(vc);
4413 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4414 }
4415 EXPORT_SYMBOL(do_unblank_screen);
4416
4417 /*
4418 * This is called by the outside world to cause a forced unblank, mostly for
4419 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4420 * call it with 1 as an argument and so force a mode restore... that may kill
4421 * X or at least garbage the screen but would also make the Oops visible...
4422 */
4423 void unblank_screen(void)
4424 {
4425 do_unblank_screen(0);
4426 }
4427
4428 /*
4429 * We defer the timer blanking to work queue so it can take the console mutex
4430 * (console operations can still happen at irq time, but only from printk which
4431 * has the console mutex. Not perfect yet, but better than no locking
4432 */
4433 static void blank_screen_t(struct timer_list *unused)
4434 {
4435 blank_timer_expired = 1;
4436 schedule_work(&console_work);
4437 }
4438
4439 void poke_blanked_console(void)
4440 {
4441 WARN_CONSOLE_UNLOCKED();
4442
4443 /* Add this so we quickly catch whoever might call us in a non
4444 * safe context. Nowadays, unblank_screen() isn't to be called in
4445 * atomic contexts and is allowed to schedule (with the special case
4446 * of oops_in_progress, but that isn't of any concern for this
4447 * function. --BenH.
4448 */
4449 might_sleep();
4450
4451 /* This isn't perfectly race free, but a race here would be mostly harmless,
4452 * at worse, we'll do a spurrious blank and it's unlikely
4453 */
4454 del_timer(&console_timer);
4455 blank_timer_expired = 0;
4456
4457 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4458 return;
4459 if (console_blanked)
4460 unblank_screen();
4461 else if (blankinterval) {
4462 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4463 blank_state = blank_normal_wait;
4464 }
4465 }
4466
4467 /*
4468 * Palettes
4469 */
4470
4471 static void set_palette(struct vc_data *vc)
4472 {
4473 WARN_CONSOLE_UNLOCKED();
4474
4475 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4476 vc->vc_sw->con_set_palette(vc, color_table);
4477 }
4478
4479 /*
4480 * Load palette into the DAC registers. arg points to a colour
4481 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4482 */
4483
4484 int con_set_cmap(unsigned char __user *arg)
4485 {
4486 int i, j, k;
4487 unsigned char colormap[3*16];
4488
4489 if (copy_from_user(colormap, arg, sizeof(colormap)))
4490 return -EFAULT;
4491
4492 console_lock();
4493 for (i = k = 0; i < 16; i++) {
4494 default_red[i] = colormap[k++];
4495 default_grn[i] = colormap[k++];
4496 default_blu[i] = colormap[k++];
4497 }
4498 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4499 if (!vc_cons_allocated(i))
4500 continue;
4501 for (j = k = 0; j < 16; j++) {
4502 vc_cons[i].d->vc_palette[k++] = default_red[j];
4503 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4504 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4505 }
4506 set_palette(vc_cons[i].d);
4507 }
4508 console_unlock();
4509
4510 return 0;
4511 }
4512
4513 int con_get_cmap(unsigned char __user *arg)
4514 {
4515 int i, k;
4516 unsigned char colormap[3*16];
4517
4518 console_lock();
4519 for (i = k = 0; i < 16; i++) {
4520 colormap[k++] = default_red[i];
4521 colormap[k++] = default_grn[i];
4522 colormap[k++] = default_blu[i];
4523 }
4524 console_unlock();
4525
4526 if (copy_to_user(arg, colormap, sizeof(colormap)))
4527 return -EFAULT;
4528
4529 return 0;
4530 }
4531
4532 void reset_palette(struct vc_data *vc)
4533 {
4534 int j, k;
4535 for (j=k=0; j<16; j++) {
4536 vc->vc_palette[k++] = default_red[j];
4537 vc->vc_palette[k++] = default_grn[j];
4538 vc->vc_palette[k++] = default_blu[j];
4539 }
4540 set_palette(vc);
4541 }
4542
4543 /*
4544 * Font switching
4545 *
4546 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4547 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4548 * depending on width) reserved for each character which is kinda wasty, but
4549 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4550 * is up to the actual low-level console-driver convert data into its favorite
4551 * format (maybe we should add a `fontoffset' field to the `display'
4552 * structure so we won't have to convert the fontdata all the time.
4553 * /Jes
4554 */
4555
4556 #define max_font_size 65536
4557
4558 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4559 {
4560 struct console_font font;
4561 int rc = -EINVAL;
4562 int c;
4563
4564 if (op->data) {
4565 font.data = kmalloc(max_font_size, GFP_KERNEL);
4566 if (!font.data)
4567 return -ENOMEM;
4568 } else
4569 font.data = NULL;
4570
4571 console_lock();
4572 if (vc->vc_mode != KD_TEXT)
4573 rc = -EINVAL;
4574 else if (vc->vc_sw->con_font_get)
4575 rc = vc->vc_sw->con_font_get(vc, &font);
4576 else
4577 rc = -ENOSYS;
4578 console_unlock();
4579
4580 if (rc)
4581 goto out;
4582
4583 c = (font.width+7)/8 * 32 * font.charcount;
4584
4585 if (op->data && font.charcount > op->charcount)
4586 rc = -ENOSPC;
4587 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4588 if (font.width > op->width || font.height > op->height)
4589 rc = -ENOSPC;
4590 } else {
4591 if (font.width != 8)
4592 rc = -EIO;
4593 else if ((op->height && font.height > op->height) ||
4594 font.height > 32)
4595 rc = -ENOSPC;
4596 }
4597 if (rc)
4598 goto out;
4599
4600 op->height = font.height;
4601 op->width = font.width;
4602 op->charcount = font.charcount;
4603
4604 if (op->data && copy_to_user(op->data, font.data, c))
4605 rc = -EFAULT;
4606
4607 out:
4608 kfree(font.data);
4609 return rc;
4610 }
4611
4612 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4613 {
4614 struct console_font font;
4615 int rc = -EINVAL;
4616 int size;
4617
4618 if (vc->vc_mode != KD_TEXT)
4619 return -EINVAL;
4620 if (!op->data)
4621 return -EINVAL;
4622 if (op->charcount > 512)
4623 return -EINVAL;
4624 if (op->width <= 0 || op->width > 32 || op->height > 32)
4625 return -EINVAL;
4626 size = (op->width+7)/8 * 32 * op->charcount;
4627 if (size > max_font_size)
4628 return -ENOSPC;
4629
4630 font.data = memdup_user(op->data, size);
4631 if (IS_ERR(font.data))
4632 return PTR_ERR(font.data);
4633
4634 if (!op->height) { /* Need to guess font height [compat] */
4635 int h, i;
4636 u8 *charmap = font.data;
4637
4638 /*
4639 * If from KDFONTOP ioctl, don't allow things which can be done
4640 * in userland,so that we can get rid of this soon
4641 */
4642 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4643 kfree(font.data);
4644 return -EINVAL;
4645 }
4646
4647 for (h = 32; h > 0; h--)
4648 for (i = 0; i < op->charcount; i++)
4649 if (charmap[32*i+h-1])
4650 goto nonzero;
4651
4652 kfree(font.data);
4653 return -EINVAL;
4654
4655 nonzero:
4656 op->height = h;
4657 }
4658
4659 font.charcount = op->charcount;
4660 font.width = op->width;
4661 font.height = op->height;
4662
4663 console_lock();
4664 if (vc->vc_mode != KD_TEXT)
4665 rc = -EINVAL;
4666 else if (vc->vc_sw->con_font_set)
4667 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4668 else
4669 rc = -ENOSYS;
4670 console_unlock();
4671 kfree(font.data);
4672 return rc;
4673 }
4674
4675 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4676 {
4677 struct console_font font = {.width = op->width, .height = op->height};
4678 char name[MAX_FONT_NAME];
4679 char *s = name;
4680 int rc;
4681
4682
4683 if (!op->data)
4684 s = NULL;
4685 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4686 return -EFAULT;
4687 else
4688 name[MAX_FONT_NAME - 1] = 0;
4689
4690 console_lock();
4691 if (vc->vc_mode != KD_TEXT) {
4692 console_unlock();
4693 return -EINVAL;
4694 }
4695 if (vc->vc_sw->con_font_default)
4696 rc = vc->vc_sw->con_font_default(vc, &font, s);
4697 else
4698 rc = -ENOSYS;
4699 console_unlock();
4700 if (!rc) {
4701 op->width = font.width;
4702 op->height = font.height;
4703 }
4704 return rc;
4705 }
4706
4707 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4708 {
4709 switch (op->op) {
4710 case KD_FONT_OP_SET:
4711 return con_font_set(vc, op);
4712 case KD_FONT_OP_GET:
4713 return con_font_get(vc, op);
4714 case KD_FONT_OP_SET_DEFAULT:
4715 return con_font_default(vc, op);
4716 case KD_FONT_OP_COPY:
4717 /* was buggy and never really used */
4718 return -EINVAL;
4719 }
4720 return -ENOSYS;
4721 }
4722
4723 /*
4724 * Interface exported to selection and vcs.
4725 */
4726
4727 /* used by selection */
4728 u16 screen_glyph(const struct vc_data *vc, int offset)
4729 {
4730 u16 w = scr_readw(screenpos(vc, offset, true));
4731 u16 c = w & 0xff;
4732
4733 if (w & vc->vc_hi_font_mask)
4734 c |= 0x100;
4735 return c;
4736 }
4737 EXPORT_SYMBOL_GPL(screen_glyph);
4738
4739 u32 screen_glyph_unicode(const struct vc_data *vc, int n)
4740 {
4741 struct uni_screen *uniscr = get_vc_uniscr(vc);
4742
4743 if (uniscr)
4744 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4745 return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4746 }
4747 EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4748
4749 /* used by vcs - note the word offset */
4750 unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
4751 {
4752 return screenpos(vc, 2 * w_offset, viewed);
4753 }
4754 EXPORT_SYMBOL_GPL(screen_pos);
4755
4756 void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
4757 {
4758 /* clamp values if they don't fit */
4759 xy[0] = min(vc->state.x, 0xFFu);
4760 xy[1] = min(vc->state.y, 0xFFu);
4761 }
4762
4763 void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
4764 {
4765 hide_cursor(vc);
4766 gotoxy(vc, xy[0], xy[1]);
4767 set_cursor(vc);
4768 }
4769
4770 u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
4771 {
4772 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4773 return softcursor_original;
4774 return scr_readw(org);
4775 }
4776
4777 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4778 {
4779 scr_writew(val, org);
4780 if ((unsigned long)org == vc->vc_pos) {
4781 softcursor_original = -1;
4782 add_softcursor(vc);
4783 }
4784 }
4785
4786 void vcs_scr_updated(struct vc_data *vc)
4787 {
4788 notify_update(vc);
4789 }
4790
4791 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4792 unsigned int rolled_over, void *base, unsigned int size)
4793 {
4794 unsigned long ubase = (unsigned long)base;
4795 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4796 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4797 ptrdiff_t origin = (void *)c->vc_origin - base;
4798 int margin = c->vc_size_row * 4;
4799 int from, wrap, from_off, avail;
4800
4801 /* Turn scrollback off */
4802 if (!lines) {
4803 c->vc_visible_origin = c->vc_origin;
4804 return;
4805 }
4806
4807 /* Do we have already enough to allow jumping from 0 to the end? */
4808 if (rolled_over > scr_end + margin) {
4809 from = scr_end;
4810 wrap = rolled_over + c->vc_size_row;
4811 } else {
4812 from = 0;
4813 wrap = size;
4814 }
4815
4816 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4817 avail = (origin - from + wrap) % wrap;
4818
4819 /* Only a little piece would be left? Show all incl. the piece! */
4820 if (avail < 2 * margin)
4821 margin = 0;
4822 if (from_off < margin)
4823 from_off = 0;
4824 if (from_off > avail - margin)
4825 from_off = avail;
4826
4827 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4828 }
4829 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4830
4831 /*
4832 * Visible symbols for modules
4833 */
4834
4835 EXPORT_SYMBOL(color_table);
4836 EXPORT_SYMBOL(default_red);
4837 EXPORT_SYMBOL(default_grn);
4838 EXPORT_SYMBOL(default_blu);
4839 EXPORT_SYMBOL(update_region);
4840 EXPORT_SYMBOL(redraw_screen);
4841 EXPORT_SYMBOL(vc_resize);
4842 EXPORT_SYMBOL(fg_console);
4843 EXPORT_SYMBOL(console_blank_hook);
4844 EXPORT_SYMBOL(console_blanked);
4845 EXPORT_SYMBOL(vc_cons);
4846 EXPORT_SYMBOL(global_cursor_default);
4847 #ifndef VT_SINGLE_DRIVER
4848 EXPORT_SYMBOL(give_up_console);
4849 #endif
Linux with added FPC-III support