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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / drivers / tty / vt / vt.c
blob309a39197be0a0199929474901deb36ada29ad34
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6 /*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
61 * deletion SMP-safe. 17Jun00, Andrew Morton
62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72 */
73
74 #include <linux/module.h>
75 #include <linux/types.h>
76 #include <linux/sched/signal.h>
77 #include <linux/tty.h>
78 #include <linux/tty_flip.h>
79 #include <linux/kernel.h>
80 #include <linux/string.h>
81 #include <linux/errno.h>
82 #include <linux/kd.h>
83 #include <linux/slab.h>
84 #include <linux/major.h>
85 #include <linux/mm.h>
86 #include <linux/console.h>
87 #include <linux/init.h>
88 #include <linux/mutex.h>
89 #include <linux/vt_kern.h>
90 #include <linux/selection.h>
91 #include <linux/tiocl.h>
92 #include <linux/kbd_kern.h>
93 #include <linux/consolemap.h>
94 #include <linux/timer.h>
95 #include <linux/interrupt.h>
96 #include <linux/workqueue.h>
97 #include <linux/pm.h>
98 #include <linux/font.h>
99 #include <linux/bitops.h>
100 #include <linux/notifier.h>
101 #include <linux/device.h>
102 #include <linux/io.h>
103 #include <linux/uaccess.h>
104 #include <linux/kdb.h>
105 #include <linux/ctype.h>
106 #include <linux/bsearch.h>
107 #include <linux/gcd.h>
108
109 #define MAX_NR_CON_DRIVER 16
110
111 #define CON_DRIVER_FLAG_MODULE 1
112 #define CON_DRIVER_FLAG_INIT 2
113 #define CON_DRIVER_FLAG_ATTR 4
114 #define CON_DRIVER_FLAG_ZOMBIE 8
115
116 struct con_driver {
117 const struct consw *con;
118 const char *desc;
119 struct device *dev;
120 int node;
121 int first;
122 int last;
123 int flag;
124 };
125
126 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
127 const struct consw *conswitchp;
128
129 /* A bitmap for codes <32. A bit of 1 indicates that the code
130 * corresponding to that bit number invokes some special action
131 * (such as cursor movement) and should not be displayed as a
132 * glyph unless the disp_ctrl mode is explicitly enabled.
133 */
134 #define CTRL_ACTION 0x0d00ff81
135 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
136
137 /*
138 * Here is the default bell parameters: 750HZ, 1/8th of a second
139 */
140 #define DEFAULT_BELL_PITCH 750
141 #define DEFAULT_BELL_DURATION (HZ/8)
142 #define DEFAULT_CURSOR_BLINK_MS 200
143
144 struct vc vc_cons [MAX_NR_CONSOLES];
145
146 #ifndef VT_SINGLE_DRIVER
147 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
148 #endif
149
150 static int con_open(struct tty_struct *, struct file *);
151 static void vc_init(struct vc_data *vc, unsigned int rows,
152 unsigned int cols, int do_clear);
153 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
154 static void save_cur(struct vc_data *vc);
155 static void reset_terminal(struct vc_data *vc, int do_clear);
156 static void con_flush_chars(struct tty_struct *tty);
157 static int set_vesa_blanking(char __user *p);
158 static void set_cursor(struct vc_data *vc);
159 static void hide_cursor(struct vc_data *vc);
160 static void console_callback(struct work_struct *ignored);
161 static void con_driver_unregister_callback(struct work_struct *ignored);
162 static void blank_screen_t(struct timer_list *unused);
163 static void set_palette(struct vc_data *vc);
164
165 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
166
167 static int printable; /* Is console ready for printing? */
168 int default_utf8 = true;
169 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
170 int global_cursor_default = -1;
171 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
172
173 static int cur_default = CUR_DEFAULT;
174 module_param(cur_default, int, S_IRUGO | S_IWUSR);
175
176 /*
177 * ignore_poke: don't unblank the screen when things are typed. This is
178 * mainly for the privacy of braille terminal users.
179 */
180 static int ignore_poke;
181
182 int do_poke_blanked_console;
183 int console_blanked;
184
185 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
186 static int vesa_off_interval;
187 static int blankinterval;
188 core_param(consoleblank, blankinterval, int, 0444);
189
190 static DECLARE_WORK(console_work, console_callback);
191 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
192
193 /*
194 * fg_console is the current virtual console,
195 * last_console is the last used one,
196 * want_console is the console we want to switch to,
197 * saved_* variants are for save/restore around kernel debugger enter/leave
198 */
199 int fg_console;
200 int last_console;
201 int want_console = -1;
202 static int saved_fg_console;
203 static int saved_last_console;
204 static int saved_want_console;
205 static int saved_vc_mode;
206 static int saved_console_blanked;
207
208 /*
209 * For each existing display, we have a pointer to console currently visible
210 * on that display, allowing consoles other than fg_console to be refreshed
211 * appropriately. Unless the low-level driver supplies its own display_fg
212 * variable, we use this one for the "master display".
213 */
214 static struct vc_data *master_display_fg;
215
216 /*
217 * Unfortunately, we need to delay tty echo when we're currently writing to the
218 * console since the code is (and always was) not re-entrant, so we schedule
219 * all flip requests to process context with schedule-task() and run it from
220 * console_callback().
221 */
222
223 /*
224 * For the same reason, we defer scrollback to the console callback.
225 */
226 static int scrollback_delta;
227
228 /*
229 * Hook so that the power management routines can (un)blank
230 * the console on our behalf.
231 */
232 int (*console_blank_hook)(int);
233
234 static DEFINE_TIMER(console_timer, blank_screen_t);
235 static int blank_state;
236 static int blank_timer_expired;
237 enum {
238 blank_off = 0,
239 blank_normal_wait,
240 blank_vesa_wait,
241 };
242
243 /*
244 * /sys/class/tty/tty0/
245 *
246 * the attribute 'active' contains the name of the current vc
247 * console and it supports poll() to detect vc switches
248 */
249 static struct device *tty0dev;
250
251 /*
252 * Notifier list for console events.
253 */
254 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
255
256 int register_vt_notifier(struct notifier_block *nb)
257 {
258 return atomic_notifier_chain_register(&vt_notifier_list, nb);
259 }
260 EXPORT_SYMBOL_GPL(register_vt_notifier);
261
262 int unregister_vt_notifier(struct notifier_block *nb)
263 {
264 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
265 }
266 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
267
268 static void notify_write(struct vc_data *vc, unsigned int unicode)
269 {
270 struct vt_notifier_param param = { .vc = vc, .c = unicode };
271 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
272 }
273
274 static void notify_update(struct vc_data *vc)
275 {
276 struct vt_notifier_param param = { .vc = vc };
277 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
278 }
279 /*
280 * Low-Level Functions
281 */
282
283 static inline bool con_is_fg(const struct vc_data *vc)
284 {
285 return vc->vc_num == fg_console;
286 }
287
288 static inline bool con_should_update(const struct vc_data *vc)
289 {
290 return con_is_visible(vc) && !console_blanked;
291 }
292
293 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
294 {
295 unsigned short *p;
296
297 if (!viewed)
298 p = (unsigned short *)(vc->vc_origin + offset);
299 else if (!vc->vc_sw->con_screen_pos)
300 p = (unsigned short *)(vc->vc_visible_origin + offset);
301 else
302 p = vc->vc_sw->con_screen_pos(vc, offset);
303 return p;
304 }
305
306 /* Called from the keyboard irq path.. */
307 static inline void scrolldelta(int lines)
308 {
309 /* FIXME */
310 /* scrolldelta needs some kind of consistency lock, but the BKL was
311 and still is not protecting versus the scheduled back end */
312 scrollback_delta += lines;
313 schedule_console_callback();
314 }
315
316 void schedule_console_callback(void)
317 {
318 schedule_work(&console_work);
319 }
320
321 /*
322 * Code to manage unicode-based screen buffers
323 */
324
325 #ifdef NO_VC_UNI_SCREEN
326 /* this disables and optimizes related code away at compile time */
327 #define get_vc_uniscr(vc) NULL
328 #else
329 #define get_vc_uniscr(vc) vc->vc_uni_screen
330 #endif
331
332 #define VC_UNI_SCREEN_DEBUG 0
333
334 typedef uint32_t char32_t;
335
336 /*
337 * Our screen buffer is preceded by an array of line pointers so that
338 * scrolling only implies some pointer shuffling.
339 */
340 struct uni_screen {
341 char32_t *lines[0];
342 };
343
344 static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
345 {
346 struct uni_screen *uniscr;
347 void *p;
348 unsigned int memsize, i;
349
350 /* allocate everything in one go */
351 memsize = cols * rows * sizeof(char32_t);
352 memsize += rows * sizeof(char32_t *);
353 p = kmalloc(memsize, GFP_KERNEL);
354 if (!p)
355 return NULL;
356
357 /* initial line pointers */
358 uniscr = p;
359 p = uniscr->lines + rows;
360 for (i = 0; i < rows; i++) {
361 uniscr->lines[i] = p;
362 p += cols * sizeof(char32_t);
363 }
364 return uniscr;
365 }
366
367 static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
368 {
369 kfree(vc->vc_uni_screen);
370 vc->vc_uni_screen = new_uniscr;
371 }
372
373 static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
374 {
375 struct uni_screen *uniscr = get_vc_uniscr(vc);
376
377 if (uniscr)
378 uniscr->lines[vc->vc_y][vc->vc_x] = uc;
379 }
380
381 static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
382 {
383 struct uni_screen *uniscr = get_vc_uniscr(vc);
384
385 if (uniscr) {
386 char32_t *ln = uniscr->lines[vc->vc_y];
387 unsigned int x = vc->vc_x, cols = vc->vc_cols;
388
389 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
390 memset32(&ln[x], ' ', nr);
391 }
392 }
393
394 static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
395 {
396 struct uni_screen *uniscr = get_vc_uniscr(vc);
397
398 if (uniscr) {
399 char32_t *ln = uniscr->lines[vc->vc_y];
400 unsigned int x = vc->vc_x, cols = vc->vc_cols;
401
402 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
403 memset32(&ln[cols - nr], ' ', nr);
404 }
405 }
406
407 static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
408 unsigned int nr)
409 {
410 struct uni_screen *uniscr = get_vc_uniscr(vc);
411
412 if (uniscr) {
413 char32_t *ln = uniscr->lines[vc->vc_y];
414
415 memset32(&ln[x], ' ', nr);
416 }
417 }
418
419 static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
420 unsigned int nr)
421 {
422 struct uni_screen *uniscr = get_vc_uniscr(vc);
423
424 if (uniscr) {
425 unsigned int cols = vc->vc_cols;
426
427 while (nr--)
428 memset32(uniscr->lines[y++], ' ', cols);
429 }
430 }
431
432 static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
433 enum con_scroll dir, unsigned int nr)
434 {
435 struct uni_screen *uniscr = get_vc_uniscr(vc);
436
437 if (uniscr) {
438 unsigned int i, j, k, sz, d, clear;
439
440 sz = b - t;
441 clear = b - nr;
442 d = nr;
443 if (dir == SM_DOWN) {
444 clear = t;
445 d = sz - nr;
446 }
447 for (i = 0; i < gcd(d, sz); i++) {
448 char32_t *tmp = uniscr->lines[t + i];
449 j = i;
450 while (1) {
451 k = j + d;
452 if (k >= sz)
453 k -= sz;
454 if (k == i)
455 break;
456 uniscr->lines[t + j] = uniscr->lines[t + k];
457 j = k;
458 }
459 uniscr->lines[t + j] = tmp;
460 }
461 vc_uniscr_clear_lines(vc, clear, nr);
462 }
463 }
464
465 static void vc_uniscr_copy_area(struct uni_screen *dst,
466 unsigned int dst_cols,
467 unsigned int dst_rows,
468 struct uni_screen *src,
469 unsigned int src_cols,
470 unsigned int src_top_row,
471 unsigned int src_bot_row)
472 {
473 unsigned int dst_row = 0;
474
475 if (!dst)
476 return;
477
478 while (src_top_row < src_bot_row) {
479 char32_t *src_line = src->lines[src_top_row];
480 char32_t *dst_line = dst->lines[dst_row];
481
482 memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
483 if (dst_cols - src_cols)
484 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
485 src_top_row++;
486 dst_row++;
487 }
488 while (dst_row < dst_rows) {
489 char32_t *dst_line = dst->lines[dst_row];
490
491 memset32(dst_line, ' ', dst_cols);
492 dst_row++;
493 }
494 }
495
496 /*
497 * Called from vcs_read() to make sure unicode screen retrieval is possible.
498 * This will initialize the unicode screen buffer if not already done.
499 * This returns 0 if OK, or a negative error code otherwise.
500 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
501 */
502 int vc_uniscr_check(struct vc_data *vc)
503 {
504 struct uni_screen *uniscr;
505 unsigned short *p;
506 int x, y, mask;
507
508 if (__is_defined(NO_VC_UNI_SCREEN))
509 return -EOPNOTSUPP;
510
511 WARN_CONSOLE_UNLOCKED();
512
513 if (!vc->vc_utf)
514 return -ENODATA;
515
516 if (vc->vc_uni_screen)
517 return 0;
518
519 uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
520 if (!uniscr)
521 return -ENOMEM;
522
523 /*
524 * Let's populate it initially with (imperfect) reverse translation.
525 * This is the next best thing we can do short of having it enabled
526 * from the start even when no users rely on this functionality. True
527 * unicode content will be available after a complete screen refresh.
528 */
529 p = (unsigned short *)vc->vc_origin;
530 mask = vc->vc_hi_font_mask | 0xff;
531 for (y = 0; y < vc->vc_rows; y++) {
532 char32_t *line = uniscr->lines[y];
533 for (x = 0; x < vc->vc_cols; x++) {
534 u16 glyph = scr_readw(p++) & mask;
535 line[x] = inverse_translate(vc, glyph, true);
536 }
537 }
538
539 vc->vc_uni_screen = uniscr;
540 return 0;
541 }
542
543 /*
544 * Called from vcs_read() to get the unicode data from the screen.
545 * This must be preceded by a successful call to vc_uniscr_check() once
546 * the console lock has been taken.
547 */
548 void vc_uniscr_copy_line(struct vc_data *vc, void *dest, int viewed,
549 unsigned int row, unsigned int col, unsigned int nr)
550 {
551 struct uni_screen *uniscr = get_vc_uniscr(vc);
552 int offset = row * vc->vc_size_row + col * 2;
553 unsigned long pos;
554
555 BUG_ON(!uniscr);
556
557 pos = (unsigned long)screenpos(vc, offset, viewed);
558 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
559 /*
560 * Desired position falls in the main screen buffer.
561 * However the actual row/col might be different if
562 * scrollback is active.
563 */
564 row = (pos - vc->vc_origin) / vc->vc_size_row;
565 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
566 memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
567 } else {
568 /*
569 * Scrollback is active. For now let's simply backtranslate
570 * the screen glyphs until the unicode screen buffer does
571 * synchronize with console display drivers for a scrollback
572 * buffer of its own.
573 */
574 u16 *p = (u16 *)pos;
575 int mask = vc->vc_hi_font_mask | 0xff;
576 char32_t *uni_buf = dest;
577 while (nr--) {
578 u16 glyph = scr_readw(p++) & mask;
579 *uni_buf++ = inverse_translate(vc, glyph, true);
580 }
581 }
582 }
583
584 /* this is for validation and debugging only */
585 static void vc_uniscr_debug_check(struct vc_data *vc)
586 {
587 struct uni_screen *uniscr = get_vc_uniscr(vc);
588 unsigned short *p;
589 int x, y, mask;
590
591 if (!VC_UNI_SCREEN_DEBUG || !uniscr)
592 return;
593
594 WARN_CONSOLE_UNLOCKED();
595
596 /*
597 * Make sure our unicode screen translates into the same glyphs
598 * as the actual screen. This is brutal indeed.
599 */
600 p = (unsigned short *)vc->vc_origin;
601 mask = vc->vc_hi_font_mask | 0xff;
602 for (y = 0; y < vc->vc_rows; y++) {
603 char32_t *line = uniscr->lines[y];
604 for (x = 0; x < vc->vc_cols; x++) {
605 u16 glyph = scr_readw(p++) & mask;
606 char32_t uc = line[x];
607 int tc = conv_uni_to_pc(vc, uc);
608 if (tc == -4)
609 tc = conv_uni_to_pc(vc, 0xfffd);
610 if (tc == -4)
611 tc = conv_uni_to_pc(vc, '?');
612 if (tc != glyph)
613 pr_err_ratelimited(
614 "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
615 __func__, x, y, glyph, tc);
616 }
617 }
618 }
619
620
621 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
622 enum con_scroll dir, unsigned int nr)
623 {
624 u16 *clear, *d, *s;
625
626 if (t + nr >= b)
627 nr = b - t - 1;
628 if (b > vc->vc_rows || t >= b || nr < 1)
629 return;
630 vc_uniscr_scroll(vc, t, b, dir, nr);
631 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
632 return;
633
634 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
635 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
636
637 if (dir == SM_UP) {
638 clear = s + (b - t - nr) * vc->vc_cols;
639 swap(s, d);
640 }
641 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
642 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
643 }
644
645 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
646 {
647 unsigned int xx, yy, offset;
648 u16 *p;
649
650 p = (u16 *) start;
651 if (!vc->vc_sw->con_getxy) {
652 offset = (start - vc->vc_origin) / 2;
653 xx = offset % vc->vc_cols;
654 yy = offset / vc->vc_cols;
655 } else {
656 int nxx, nyy;
657 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
658 xx = nxx; yy = nyy;
659 }
660 for(;;) {
661 u16 attrib = scr_readw(p) & 0xff00;
662 int startx = xx;
663 u16 *q = p;
664 while (xx < vc->vc_cols && count) {
665 if (attrib != (scr_readw(p) & 0xff00)) {
666 if (p > q)
667 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
668 startx = xx;
669 q = p;
670 attrib = scr_readw(p) & 0xff00;
671 }
672 p++;
673 xx++;
674 count--;
675 }
676 if (p > q)
677 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
678 if (!count)
679 break;
680 xx = 0;
681 yy++;
682 if (vc->vc_sw->con_getxy) {
683 p = (u16 *)start;
684 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
685 }
686 }
687 }
688
689 void update_region(struct vc_data *vc, unsigned long start, int count)
690 {
691 WARN_CONSOLE_UNLOCKED();
692
693 if (con_should_update(vc)) {
694 hide_cursor(vc);
695 do_update_region(vc, start, count);
696 set_cursor(vc);
697 }
698 }
699
700 /* Structure of attributes is hardware-dependent */
701
702 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
703 u8 _underline, u8 _reverse, u8 _italic)
704 {
705 if (vc->vc_sw->con_build_attr)
706 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
707 _blink, _underline, _reverse, _italic);
708
709 /*
710 * ++roman: I completely changed the attribute format for monochrome
711 * mode (!can_do_color). The formerly used MDA (monochrome display
712 * adapter) format didn't allow the combination of certain effects.
713 * Now the attribute is just a bit vector:
714 * Bit 0..1: intensity (0..2)
715 * Bit 2 : underline
716 * Bit 3 : reverse
717 * Bit 7 : blink
718 */
719 {
720 u8 a = _color;
721 if (!vc->vc_can_do_color)
722 return _intensity |
723 (_italic ? 2 : 0) |
724 (_underline ? 4 : 0) |
725 (_reverse ? 8 : 0) |
726 (_blink ? 0x80 : 0);
727 if (_italic)
728 a = (a & 0xF0) | vc->vc_itcolor;
729 else if (_underline)
730 a = (a & 0xf0) | vc->vc_ulcolor;
731 else if (_intensity == 0)
732 a = (a & 0xf0) | vc->vc_halfcolor;
733 if (_reverse)
734 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
735 if (_blink)
736 a ^= 0x80;
737 if (_intensity == 2)
738 a ^= 0x08;
739 if (vc->vc_hi_font_mask == 0x100)
740 a <<= 1;
741 return a;
742 }
743 }
744
745 static void update_attr(struct vc_data *vc)
746 {
747 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
748 vc->vc_blink, vc->vc_underline,
749 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
750 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
751 }
752
753 /* Note: inverting the screen twice should revert to the original state */
754 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
755 {
756 unsigned short *p;
757
758 WARN_CONSOLE_UNLOCKED();
759
760 count /= 2;
761 p = screenpos(vc, offset, viewed);
762 if (vc->vc_sw->con_invert_region) {
763 vc->vc_sw->con_invert_region(vc, p, count);
764 } else {
765 u16 *q = p;
766 int cnt = count;
767 u16 a;
768
769 if (!vc->vc_can_do_color) {
770 while (cnt--) {
771 a = scr_readw(q);
772 a ^= 0x0800;
773 scr_writew(a, q);
774 q++;
775 }
776 } else if (vc->vc_hi_font_mask == 0x100) {
777 while (cnt--) {
778 a = scr_readw(q);
779 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
780 scr_writew(a, q);
781 q++;
782 }
783 } else {
784 while (cnt--) {
785 a = scr_readw(q);
786 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
787 scr_writew(a, q);
788 q++;
789 }
790 }
791 }
792
793 if (con_should_update(vc))
794 do_update_region(vc, (unsigned long) p, count);
795 notify_update(vc);
796 }
797
798 /* used by selection: complement pointer position */
799 void complement_pos(struct vc_data *vc, int offset)
800 {
801 static int old_offset = -1;
802 static unsigned short old;
803 static unsigned short oldx, oldy;
804
805 WARN_CONSOLE_UNLOCKED();
806
807 if (old_offset != -1 && old_offset >= 0 &&
808 old_offset < vc->vc_screenbuf_size) {
809 scr_writew(old, screenpos(vc, old_offset, 1));
810 if (con_should_update(vc))
811 vc->vc_sw->con_putc(vc, old, oldy, oldx);
812 notify_update(vc);
813 }
814
815 old_offset = offset;
816
817 if (offset != -1 && offset >= 0 &&
818 offset < vc->vc_screenbuf_size) {
819 unsigned short new;
820 unsigned short *p;
821 p = screenpos(vc, offset, 1);
822 old = scr_readw(p);
823 new = old ^ vc->vc_complement_mask;
824 scr_writew(new, p);
825 if (con_should_update(vc)) {
826 oldx = (offset >> 1) % vc->vc_cols;
827 oldy = (offset >> 1) / vc->vc_cols;
828 vc->vc_sw->con_putc(vc, new, oldy, oldx);
829 }
830 notify_update(vc);
831 }
832 }
833
834 static void insert_char(struct vc_data *vc, unsigned int nr)
835 {
836 unsigned short *p = (unsigned short *) vc->vc_pos;
837
838 vc_uniscr_insert(vc, nr);
839 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
840 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
841 vc->vc_need_wrap = 0;
842 if (con_should_update(vc))
843 do_update_region(vc, (unsigned long) p,
844 vc->vc_cols - vc->vc_x);
845 }
846
847 static void delete_char(struct vc_data *vc, unsigned int nr)
848 {
849 unsigned short *p = (unsigned short *) vc->vc_pos;
850
851 vc_uniscr_delete(vc, nr);
852 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
853 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
854 nr * 2);
855 vc->vc_need_wrap = 0;
856 if (con_should_update(vc))
857 do_update_region(vc, (unsigned long) p,
858 vc->vc_cols - vc->vc_x);
859 }
860
861 static int softcursor_original = -1;
862
863 static void add_softcursor(struct vc_data *vc)
864 {
865 int i = scr_readw((u16 *) vc->vc_pos);
866 u32 type = vc->vc_cursor_type;
867
868 if (! (type & 0x10)) return;
869 if (softcursor_original != -1) return;
870 softcursor_original = i;
871 i |= ((type >> 8) & 0xff00 );
872 i ^= ((type) & 0xff00 );
873 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
874 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
875 scr_writew(i, (u16 *) vc->vc_pos);
876 if (con_should_update(vc))
877 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
878 }
879
880 static void hide_softcursor(struct vc_data *vc)
881 {
882 if (softcursor_original != -1) {
883 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
884 if (con_should_update(vc))
885 vc->vc_sw->con_putc(vc, softcursor_original,
886 vc->vc_y, vc->vc_x);
887 softcursor_original = -1;
888 }
889 }
890
891 static void hide_cursor(struct vc_data *vc)
892 {
893 if (vc_is_sel(vc))
894 clear_selection();
895
896 vc->vc_sw->con_cursor(vc, CM_ERASE);
897 hide_softcursor(vc);
898 }
899
900 static void set_cursor(struct vc_data *vc)
901 {
902 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
903 return;
904 if (vc->vc_deccm) {
905 if (vc_is_sel(vc))
906 clear_selection();
907 add_softcursor(vc);
908 if ((vc->vc_cursor_type & 0x0f) != 1)
909 vc->vc_sw->con_cursor(vc, CM_DRAW);
910 } else
911 hide_cursor(vc);
912 }
913
914 static void set_origin(struct vc_data *vc)
915 {
916 WARN_CONSOLE_UNLOCKED();
917
918 if (!con_is_visible(vc) ||
919 !vc->vc_sw->con_set_origin ||
920 !vc->vc_sw->con_set_origin(vc))
921 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
922 vc->vc_visible_origin = vc->vc_origin;
923 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
924 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
925 }
926
927 static void save_screen(struct vc_data *vc)
928 {
929 WARN_CONSOLE_UNLOCKED();
930
931 if (vc->vc_sw->con_save_screen)
932 vc->vc_sw->con_save_screen(vc);
933 }
934
935 static void flush_scrollback(struct vc_data *vc)
936 {
937 WARN_CONSOLE_UNLOCKED();
938
939 set_origin(vc);
940 if (vc->vc_sw->con_flush_scrollback) {
941 vc->vc_sw->con_flush_scrollback(vc);
942 } else if (con_is_visible(vc)) {
943 /*
944 * When no con_flush_scrollback method is provided then the
945 * legacy way for flushing the scrollback buffer is to use
946 * a side effect of the con_switch method. We do it only on
947 * the foreground console as background consoles have no
948 * scrollback buffers in that case and we obviously don't
949 * want to switch to them.
950 */
951 hide_cursor(vc);
952 vc->vc_sw->con_switch(vc);
953 set_cursor(vc);
954 }
955 }
956
957 /*
958 * Redrawing of screen
959 */
960
961 void clear_buffer_attributes(struct vc_data *vc)
962 {
963 unsigned short *p = (unsigned short *)vc->vc_origin;
964 int count = vc->vc_screenbuf_size / 2;
965 int mask = vc->vc_hi_font_mask | 0xff;
966
967 for (; count > 0; count--, p++) {
968 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
969 }
970 }
971
972 void redraw_screen(struct vc_data *vc, int is_switch)
973 {
974 int redraw = 0;
975
976 WARN_CONSOLE_UNLOCKED();
977
978 if (!vc) {
979 /* strange ... */
980 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
981 return;
982 }
983
984 if (is_switch) {
985 struct vc_data *old_vc = vc_cons[fg_console].d;
986 if (old_vc == vc)
987 return;
988 if (!con_is_visible(vc))
989 redraw = 1;
990 *vc->vc_display_fg = vc;
991 fg_console = vc->vc_num;
992 hide_cursor(old_vc);
993 if (!con_is_visible(old_vc)) {
994 save_screen(old_vc);
995 set_origin(old_vc);
996 }
997 if (tty0dev)
998 sysfs_notify(&tty0dev->kobj, NULL, "active");
999 } else {
1000 hide_cursor(vc);
1001 redraw = 1;
1002 }
1003
1004 if (redraw) {
1005 int update;
1006 int old_was_color = vc->vc_can_do_color;
1007
1008 set_origin(vc);
1009 update = vc->vc_sw->con_switch(vc);
1010 set_palette(vc);
1011 /*
1012 * If console changed from mono<->color, the best we can do
1013 * is to clear the buffer attributes. As it currently stands,
1014 * rebuilding new attributes from the old buffer is not doable
1015 * without overly complex code.
1016 */
1017 if (old_was_color != vc->vc_can_do_color) {
1018 update_attr(vc);
1019 clear_buffer_attributes(vc);
1020 }
1021
1022 if (update && vc->vc_mode != KD_GRAPHICS)
1023 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1024 }
1025 set_cursor(vc);
1026 if (is_switch) {
1027 set_leds();
1028 compute_shiftstate();
1029 notify_update(vc);
1030 }
1031 }
1032
1033 /*
1034 * Allocation, freeing and resizing of VTs.
1035 */
1036
1037 int vc_cons_allocated(unsigned int i)
1038 {
1039 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1040 }
1041
1042 static void visual_init(struct vc_data *vc, int num, int init)
1043 {
1044 /* ++Geert: vc->vc_sw->con_init determines console size */
1045 if (vc->vc_sw)
1046 module_put(vc->vc_sw->owner);
1047 vc->vc_sw = conswitchp;
1048 #ifndef VT_SINGLE_DRIVER
1049 if (con_driver_map[num])
1050 vc->vc_sw = con_driver_map[num];
1051 #endif
1052 __module_get(vc->vc_sw->owner);
1053 vc->vc_num = num;
1054 vc->vc_display_fg = &master_display_fg;
1055 if (vc->vc_uni_pagedir_loc)
1056 con_free_unimap(vc);
1057 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
1058 vc->vc_uni_pagedir = NULL;
1059 vc->vc_hi_font_mask = 0;
1060 vc->vc_complement_mask = 0;
1061 vc->vc_can_do_color = 0;
1062 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1063 vc->vc_sw->con_init(vc, init);
1064 if (!vc->vc_complement_mask)
1065 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1066 vc->vc_s_complement_mask = vc->vc_complement_mask;
1067 vc->vc_size_row = vc->vc_cols << 1;
1068 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1069 }
1070
1071
1072 static void visual_deinit(struct vc_data *vc)
1073 {
1074 vc->vc_sw->con_deinit(vc);
1075 module_put(vc->vc_sw->owner);
1076 }
1077
1078 static void vc_port_destruct(struct tty_port *port)
1079 {
1080 struct vc_data *vc = container_of(port, struct vc_data, port);
1081
1082 kfree(vc);
1083 }
1084
1085 static const struct tty_port_operations vc_port_ops = {
1086 .destruct = vc_port_destruct,
1087 };
1088
1089 int vc_allocate(unsigned int currcons) /* return 0 on success */
1090 {
1091 struct vt_notifier_param param;
1092 struct vc_data *vc;
1093
1094 WARN_CONSOLE_UNLOCKED();
1095
1096 if (currcons >= MAX_NR_CONSOLES)
1097 return -ENXIO;
1098
1099 if (vc_cons[currcons].d)
1100 return 0;
1101
1102 /* due to the granularity of kmalloc, we waste some memory here */
1103 /* the alloc is done in two steps, to optimize the common situation
1104 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1105 /* although the numbers above are not valid since long ago, the
1106 point is still up-to-date and the comment still has its value
1107 even if only as a historical artifact. --mj, July 1998 */
1108 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1109 if (!vc)
1110 return -ENOMEM;
1111
1112 vc_cons[currcons].d = vc;
1113 tty_port_init(&vc->port);
1114 vc->port.ops = &vc_port_ops;
1115 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1116
1117 visual_init(vc, currcons, 1);
1118
1119 if (!*vc->vc_uni_pagedir_loc)
1120 con_set_default_unimap(vc);
1121
1122 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1123 if (!vc->vc_screenbuf)
1124 goto err_free;
1125
1126 /* If no drivers have overridden us and the user didn't pass a
1127 boot option, default to displaying the cursor */
1128 if (global_cursor_default == -1)
1129 global_cursor_default = 1;
1130
1131 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1132 vcs_make_sysfs(currcons);
1133 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1134
1135 return 0;
1136 err_free:
1137 visual_deinit(vc);
1138 kfree(vc);
1139 vc_cons[currcons].d = NULL;
1140 return -ENOMEM;
1141 }
1142
1143 static inline int resize_screen(struct vc_data *vc, int width, int height,
1144 int user)
1145 {
1146 /* Resizes the resolution of the display adapater */
1147 int err = 0;
1148
1149 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
1150 err = vc->vc_sw->con_resize(vc, width, height, user);
1151
1152 return err;
1153 }
1154
1155 /*
1156 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1157 * [this is to be used together with some user program
1158 * like resize that changes the hardware videomode]
1159 */
1160 #define VC_RESIZE_MAXCOL (32767)
1161 #define VC_RESIZE_MAXROW (32767)
1162
1163 /**
1164 * vc_do_resize - resizing method for the tty
1165 * @tty: tty being resized
1166 * @real_tty: real tty (different to tty if a pty/tty pair)
1167 * @vc: virtual console private data
1168 * @cols: columns
1169 * @lines: lines
1170 *
1171 * Resize a virtual console, clipping according to the actual constraints.
1172 * If the caller passes a tty structure then update the termios winsize
1173 * information and perform any necessary signal handling.
1174 *
1175 * Caller must hold the console semaphore. Takes the termios rwsem and
1176 * ctrl_lock of the tty IFF a tty is passed.
1177 */
1178
1179 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1180 unsigned int cols, unsigned int lines)
1181 {
1182 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1183 unsigned long end;
1184 unsigned int old_rows, old_row_size, first_copied_row;
1185 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1186 unsigned int user;
1187 unsigned short *newscreen;
1188 struct uni_screen *new_uniscr = NULL;
1189
1190 WARN_CONSOLE_UNLOCKED();
1191
1192 if (!vc)
1193 return -ENXIO;
1194
1195 user = vc->vc_resize_user;
1196 vc->vc_resize_user = 0;
1197
1198 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
1199 return -EINVAL;
1200
1201 new_cols = (cols ? cols : vc->vc_cols);
1202 new_rows = (lines ? lines : vc->vc_rows);
1203 new_row_size = new_cols << 1;
1204 new_screen_size = new_row_size * new_rows;
1205
1206 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1207 return 0;
1208
1209 if (new_screen_size > (4 << 20))
1210 return -EINVAL;
1211 newscreen = kzalloc(new_screen_size, GFP_USER);
1212 if (!newscreen)
1213 return -ENOMEM;
1214
1215 if (get_vc_uniscr(vc)) {
1216 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1217 if (!new_uniscr) {
1218 kfree(newscreen);
1219 return -ENOMEM;
1220 }
1221 }
1222
1223 if (vc_is_sel(vc))
1224 clear_selection();
1225
1226 old_rows = vc->vc_rows;
1227 old_row_size = vc->vc_size_row;
1228
1229 err = resize_screen(vc, new_cols, new_rows, user);
1230 if (err) {
1231 kfree(newscreen);
1232 kfree(new_uniscr);
1233 return err;
1234 }
1235
1236 vc->vc_rows = new_rows;
1237 vc->vc_cols = new_cols;
1238 vc->vc_size_row = new_row_size;
1239 vc->vc_screenbuf_size = new_screen_size;
1240
1241 rlth = min(old_row_size, new_row_size);
1242 rrem = new_row_size - rlth;
1243 old_origin = vc->vc_origin;
1244 new_origin = (long) newscreen;
1245 new_scr_end = new_origin + new_screen_size;
1246
1247 if (vc->vc_y > new_rows) {
1248 if (old_rows - vc->vc_y < new_rows) {
1249 /*
1250 * Cursor near the bottom, copy contents from the
1251 * bottom of buffer
1252 */
1253 first_copied_row = (old_rows - new_rows);
1254 } else {
1255 /*
1256 * Cursor is in no man's land, copy 1/2 screenful
1257 * from the top and bottom of cursor position
1258 */
1259 first_copied_row = (vc->vc_y - new_rows/2);
1260 }
1261 old_origin += first_copied_row * old_row_size;
1262 } else
1263 first_copied_row = 0;
1264 end = old_origin + old_row_size * min(old_rows, new_rows);
1265
1266 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1267 get_vc_uniscr(vc), rlth/2, first_copied_row,
1268 min(old_rows, new_rows));
1269 vc_uniscr_set(vc, new_uniscr);
1270
1271 update_attr(vc);
1272
1273 while (old_origin < end) {
1274 scr_memcpyw((unsigned short *) new_origin,
1275 (unsigned short *) old_origin, rlth);
1276 if (rrem)
1277 scr_memsetw((void *)(new_origin + rlth),
1278 vc->vc_video_erase_char, rrem);
1279 old_origin += old_row_size;
1280 new_origin += new_row_size;
1281 }
1282 if (new_scr_end > new_origin)
1283 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1284 new_scr_end - new_origin);
1285 kfree(vc->vc_screenbuf);
1286 vc->vc_screenbuf = newscreen;
1287 vc->vc_screenbuf_size = new_screen_size;
1288 set_origin(vc);
1289
1290 /* do part of a reset_terminal() */
1291 vc->vc_top = 0;
1292 vc->vc_bottom = vc->vc_rows;
1293 gotoxy(vc, vc->vc_x, vc->vc_y);
1294 save_cur(vc);
1295
1296 if (tty) {
1297 /* Rewrite the requested winsize data with the actual
1298 resulting sizes */
1299 struct winsize ws;
1300 memset(&ws, 0, sizeof(ws));
1301 ws.ws_row = vc->vc_rows;
1302 ws.ws_col = vc->vc_cols;
1303 ws.ws_ypixel = vc->vc_scan_lines;
1304 tty_do_resize(tty, &ws);
1305 }
1306
1307 if (con_is_visible(vc))
1308 update_screen(vc);
1309 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1310 notify_update(vc);
1311 return err;
1312 }
1313
1314 /**
1315 * vc_resize - resize a VT
1316 * @vc: virtual console
1317 * @cols: columns
1318 * @rows: rows
1319 *
1320 * Resize a virtual console as seen from the console end of things. We
1321 * use the common vc_do_resize methods to update the structures. The
1322 * caller must hold the console sem to protect console internals and
1323 * vc->port.tty
1324 */
1325
1326 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1327 {
1328 return vc_do_resize(vc->port.tty, vc, cols, rows);
1329 }
1330
1331 /**
1332 * vt_resize - resize a VT
1333 * @tty: tty to resize
1334 * @ws: winsize attributes
1335 *
1336 * Resize a virtual terminal. This is called by the tty layer as we
1337 * register our own handler for resizing. The mutual helper does all
1338 * the actual work.
1339 *
1340 * Takes the console sem and the called methods then take the tty
1341 * termios_rwsem and the tty ctrl_lock in that order.
1342 */
1343 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1344 {
1345 struct vc_data *vc = tty->driver_data;
1346 int ret;
1347
1348 console_lock();
1349 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1350 console_unlock();
1351 return ret;
1352 }
1353
1354 struct vc_data *vc_deallocate(unsigned int currcons)
1355 {
1356 struct vc_data *vc = NULL;
1357
1358 WARN_CONSOLE_UNLOCKED();
1359
1360 if (vc_cons_allocated(currcons)) {
1361 struct vt_notifier_param param;
1362
1363 param.vc = vc = vc_cons[currcons].d;
1364 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1365 vcs_remove_sysfs(currcons);
1366 visual_deinit(vc);
1367 put_pid(vc->vt_pid);
1368 vc_uniscr_set(vc, NULL);
1369 kfree(vc->vc_screenbuf);
1370 vc_cons[currcons].d = NULL;
1371 }
1372 return vc;
1373 }
1374
1375 /*
1376 * VT102 emulator
1377 */
1378
1379 enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1380
1381 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1382 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1383 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1384
1385 #define decarm VC_REPEAT
1386 #define decckm VC_CKMODE
1387 #define kbdapplic VC_APPLIC
1388 #define lnm VC_CRLF
1389
1390 /*
1391 * this is what the terminal answers to a ESC-Z or csi0c query.
1392 */
1393 #define VT100ID "\033[?1;2c"
1394 #define VT102ID "\033[?6c"
1395
1396 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1397 8,12,10,14, 9,13,11,15 };
1398
1399 /* the default colour table, for VGA+ colour systems */
1400 unsigned char default_red[] = {
1401 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1402 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1403 };
1404 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1405
1406 unsigned char default_grn[] = {
1407 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1408 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1409 };
1410 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1411
1412 unsigned char default_blu[] = {
1413 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1414 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1415 };
1416 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1417
1418 /*
1419 * gotoxy() must verify all boundaries, because the arguments
1420 * might also be negative. If the given position is out of
1421 * bounds, the cursor is placed at the nearest margin.
1422 */
1423 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1424 {
1425 int min_y, max_y;
1426
1427 if (new_x < 0)
1428 vc->vc_x = 0;
1429 else {
1430 if (new_x >= vc->vc_cols)
1431 vc->vc_x = vc->vc_cols - 1;
1432 else
1433 vc->vc_x = new_x;
1434 }
1435
1436 if (vc->vc_decom) {
1437 min_y = vc->vc_top;
1438 max_y = vc->vc_bottom;
1439 } else {
1440 min_y = 0;
1441 max_y = vc->vc_rows;
1442 }
1443 if (new_y < min_y)
1444 vc->vc_y = min_y;
1445 else if (new_y >= max_y)
1446 vc->vc_y = max_y - 1;
1447 else
1448 vc->vc_y = new_y;
1449 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1450 vc->vc_need_wrap = 0;
1451 }
1452
1453 /* for absolute user moves, when decom is set */
1454 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1455 {
1456 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1457 }
1458
1459 void scrollback(struct vc_data *vc)
1460 {
1461 scrolldelta(-(vc->vc_rows / 2));
1462 }
1463
1464 void scrollfront(struct vc_data *vc, int lines)
1465 {
1466 if (!lines)
1467 lines = vc->vc_rows / 2;
1468 scrolldelta(lines);
1469 }
1470
1471 static void lf(struct vc_data *vc)
1472 {
1473 /* don't scroll if above bottom of scrolling region, or
1474 * if below scrolling region
1475 */
1476 if (vc->vc_y + 1 == vc->vc_bottom)
1477 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1478 else if (vc->vc_y < vc->vc_rows - 1) {
1479 vc->vc_y++;
1480 vc->vc_pos += vc->vc_size_row;
1481 }
1482 vc->vc_need_wrap = 0;
1483 notify_write(vc, '\n');
1484 }
1485
1486 static void ri(struct vc_data *vc)
1487 {
1488 /* don't scroll if below top of scrolling region, or
1489 * if above scrolling region
1490 */
1491 if (vc->vc_y == vc->vc_top)
1492 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1493 else if (vc->vc_y > 0) {
1494 vc->vc_y--;
1495 vc->vc_pos -= vc->vc_size_row;
1496 }
1497 vc->vc_need_wrap = 0;
1498 }
1499
1500 static inline void cr(struct vc_data *vc)
1501 {
1502 vc->vc_pos -= vc->vc_x << 1;
1503 vc->vc_need_wrap = vc->vc_x = 0;
1504 notify_write(vc, '\r');
1505 }
1506
1507 static inline void bs(struct vc_data *vc)
1508 {
1509 if (vc->vc_x) {
1510 vc->vc_pos -= 2;
1511 vc->vc_x--;
1512 vc->vc_need_wrap = 0;
1513 notify_write(vc, '\b');
1514 }
1515 }
1516
1517 static inline void del(struct vc_data *vc)
1518 {
1519 /* ignored */
1520 }
1521
1522 static void csi_J(struct vc_data *vc, int vpar)
1523 {
1524 unsigned int count;
1525 unsigned short * start;
1526
1527 switch (vpar) {
1528 case 0: /* erase from cursor to end of display */
1529 vc_uniscr_clear_line(vc, vc->vc_x,
1530 vc->vc_cols - vc->vc_x);
1531 vc_uniscr_clear_lines(vc, vc->vc_y + 1,
1532 vc->vc_rows - vc->vc_y - 1);
1533 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1534 start = (unsigned short *)vc->vc_pos;
1535 break;
1536 case 1: /* erase from start to cursor */
1537 vc_uniscr_clear_line(vc, 0, vc->vc_x + 1);
1538 vc_uniscr_clear_lines(vc, 0, vc->vc_y);
1539 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1540 start = (unsigned short *)vc->vc_origin;
1541 break;
1542 case 3: /* include scrollback */
1543 flush_scrollback(vc);
1544 /* fallthrough */
1545 case 2: /* erase whole display */
1546 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1547 count = vc->vc_cols * vc->vc_rows;
1548 start = (unsigned short *)vc->vc_origin;
1549 break;
1550 default:
1551 return;
1552 }
1553 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1554 if (con_should_update(vc))
1555 do_update_region(vc, (unsigned long) start, count);
1556 vc->vc_need_wrap = 0;
1557 }
1558
1559 static void csi_K(struct vc_data *vc, int vpar)
1560 {
1561 unsigned int count;
1562 unsigned short *start = (unsigned short *)vc->vc_pos;
1563 int offset;
1564
1565 switch (vpar) {
1566 case 0: /* erase from cursor to end of line */
1567 offset = 0;
1568 count = vc->vc_cols - vc->vc_x;
1569 break;
1570 case 1: /* erase from start of line to cursor */
1571 offset = -vc->vc_x;
1572 count = vc->vc_x + 1;
1573 break;
1574 case 2: /* erase whole line */
1575 offset = -vc->vc_x;
1576 count = vc->vc_cols;
1577 break;
1578 default:
1579 return;
1580 }
1581 vc_uniscr_clear_line(vc, vc->vc_x + offset, count);
1582 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1583 vc->vc_need_wrap = 0;
1584 if (con_should_update(vc))
1585 do_update_region(vc, (unsigned long)(start + offset), count);
1586 }
1587
1588 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1589 { /* not vt100? */
1590 int count;
1591
1592 if (!vpar)
1593 vpar++;
1594 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1595
1596 vc_uniscr_clear_line(vc, vc->vc_x, count);
1597 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1598 if (con_should_update(vc))
1599 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1600 vc->vc_need_wrap = 0;
1601 }
1602
1603 static void default_attr(struct vc_data *vc)
1604 {
1605 vc->vc_intensity = 1;
1606 vc->vc_italic = 0;
1607 vc->vc_underline = 0;
1608 vc->vc_reverse = 0;
1609 vc->vc_blink = 0;
1610 vc->vc_color = vc->vc_def_color;
1611 }
1612
1613 struct rgb { u8 r; u8 g; u8 b; };
1614
1615 static void rgb_from_256(int i, struct rgb *c)
1616 {
1617 if (i < 8) { /* Standard colours. */
1618 c->r = i&1 ? 0xaa : 0x00;
1619 c->g = i&2 ? 0xaa : 0x00;
1620 c->b = i&4 ? 0xaa : 0x00;
1621 } else if (i < 16) {
1622 c->r = i&1 ? 0xff : 0x55;
1623 c->g = i&2 ? 0xff : 0x55;
1624 c->b = i&4 ? 0xff : 0x55;
1625 } else if (i < 232) { /* 6x6x6 colour cube. */
1626 c->r = (i - 16) / 36 * 85 / 2;
1627 c->g = (i - 16) / 6 % 6 * 85 / 2;
1628 c->b = (i - 16) % 6 * 85 / 2;
1629 } else /* Grayscale ramp. */
1630 c->r = c->g = c->b = i * 10 - 2312;
1631 }
1632
1633 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1634 {
1635 u8 hue = 0, max = max3(c->r, c->g, c->b);
1636
1637 if (c->r > max / 2)
1638 hue |= 4;
1639 if (c->g > max / 2)
1640 hue |= 2;
1641 if (c->b > max / 2)
1642 hue |= 1;
1643
1644 if (hue == 7 && max <= 0x55) {
1645 hue = 0;
1646 vc->vc_intensity = 2;
1647 } else if (max > 0xaa)
1648 vc->vc_intensity = 2;
1649 else
1650 vc->vc_intensity = 1;
1651
1652 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1653 }
1654
1655 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1656 {
1657 /* For backgrounds, err on the dark side. */
1658 vc->vc_color = (vc->vc_color & 0x0f)
1659 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1660 }
1661
1662 /*
1663 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1664 * and thus need to be detected and ignored by hand. That standard also
1665 * wants : rather than ; as separators but sequences containing : are currently
1666 * completely ignored by the parser.
1667 *
1668 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1669 * supporting them.
1670 */
1671 static int vc_t416_color(struct vc_data *vc, int i,
1672 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1673 {
1674 struct rgb c;
1675
1676 i++;
1677 if (i > vc->vc_npar)
1678 return i;
1679
1680 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1681 /* 256 colours */
1682 i++;
1683 rgb_from_256(vc->vc_par[i], &c);
1684 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1685 /* 24 bit */
1686 c.r = vc->vc_par[i + 1];
1687 c.g = vc->vc_par[i + 2];
1688 c.b = vc->vc_par[i + 3];
1689 i += 3;
1690 } else
1691 return i;
1692
1693 set_color(vc, &c);
1694
1695 return i;
1696 }
1697
1698 /* console_lock is held */
1699 static void csi_m(struct vc_data *vc)
1700 {
1701 int i;
1702
1703 for (i = 0; i <= vc->vc_npar; i++)
1704 switch (vc->vc_par[i]) {
1705 case 0: /* all attributes off */
1706 default_attr(vc);
1707 break;
1708 case 1:
1709 vc->vc_intensity = 2;
1710 break;
1711 case 2:
1712 vc->vc_intensity = 0;
1713 break;
1714 case 3:
1715 vc->vc_italic = 1;
1716 break;
1717 case 21:
1718 /*
1719 * No console drivers support double underline, so
1720 * convert it to a single underline.
1721 */
1722 case 4:
1723 vc->vc_underline = 1;
1724 break;
1725 case 5:
1726 vc->vc_blink = 1;
1727 break;
1728 case 7:
1729 vc->vc_reverse = 1;
1730 break;
1731 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1732 * Select primary font, don't display control chars if
1733 * defined, don't set bit 8 on output.
1734 */
1735 vc->vc_translate = set_translate(vc->vc_charset == 0
1736 ? vc->vc_G0_charset
1737 : vc->vc_G1_charset, vc);
1738 vc->vc_disp_ctrl = 0;
1739 vc->vc_toggle_meta = 0;
1740 break;
1741 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1742 * Select first alternate font, lets chars < 32 be
1743 * displayed as ROM chars.
1744 */
1745 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1746 vc->vc_disp_ctrl = 1;
1747 vc->vc_toggle_meta = 0;
1748 break;
1749 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1750 * Select second alternate font, toggle high bit
1751 * before displaying as ROM char.
1752 */
1753 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1754 vc->vc_disp_ctrl = 1;
1755 vc->vc_toggle_meta = 1;
1756 break;
1757 case 22:
1758 vc->vc_intensity = 1;
1759 break;
1760 case 23:
1761 vc->vc_italic = 0;
1762 break;
1763 case 24:
1764 vc->vc_underline = 0;
1765 break;
1766 case 25:
1767 vc->vc_blink = 0;
1768 break;
1769 case 27:
1770 vc->vc_reverse = 0;
1771 break;
1772 case 38:
1773 i = vc_t416_color(vc, i, rgb_foreground);
1774 break;
1775 case 48:
1776 i = vc_t416_color(vc, i, rgb_background);
1777 break;
1778 case 39:
1779 vc->vc_color = (vc->vc_def_color & 0x0f) |
1780 (vc->vc_color & 0xf0);
1781 break;
1782 case 49:
1783 vc->vc_color = (vc->vc_def_color & 0xf0) |
1784 (vc->vc_color & 0x0f);
1785 break;
1786 default:
1787 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1788 if (vc->vc_par[i] < 100)
1789 vc->vc_intensity = 2;
1790 vc->vc_par[i] -= 60;
1791 }
1792 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1793 vc->vc_color = color_table[vc->vc_par[i] - 30]
1794 | (vc->vc_color & 0xf0);
1795 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1796 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1797 | (vc->vc_color & 0x0f);
1798 break;
1799 }
1800 update_attr(vc);
1801 }
1802
1803 static void respond_string(const char *p, struct tty_port *port)
1804 {
1805 while (*p) {
1806 tty_insert_flip_char(port, *p, 0);
1807 p++;
1808 }
1809 tty_schedule_flip(port);
1810 }
1811
1812 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1813 {
1814 char buf[40];
1815
1816 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1817 respond_string(buf, tty->port);
1818 }
1819
1820 static inline void status_report(struct tty_struct *tty)
1821 {
1822 respond_string("\033[0n", tty->port); /* Terminal ok */
1823 }
1824
1825 static inline void respond_ID(struct tty_struct *tty)
1826 {
1827 respond_string(VT102ID, tty->port);
1828 }
1829
1830 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1831 {
1832 char buf[8];
1833
1834 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1835 (char)('!' + mry));
1836 respond_string(buf, tty->port);
1837 }
1838
1839 /* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1840 int mouse_reporting(void)
1841 {
1842 return vc_cons[fg_console].d->vc_report_mouse;
1843 }
1844
1845 /* console_lock is held */
1846 static void set_mode(struct vc_data *vc, int on_off)
1847 {
1848 int i;
1849
1850 for (i = 0; i <= vc->vc_npar; i++)
1851 if (vc->vc_priv == EPdec) {
1852 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1853 case 1: /* Cursor keys send ^[Ox/^[[x */
1854 if (on_off)
1855 set_kbd(vc, decckm);
1856 else
1857 clr_kbd(vc, decckm);
1858 break;
1859 case 3: /* 80/132 mode switch unimplemented */
1860 #if 0
1861 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1862 /* this alone does not suffice; some user mode
1863 utility has to change the hardware regs */
1864 #endif
1865 break;
1866 case 5: /* Inverted screen on/off */
1867 if (vc->vc_decscnm != on_off) {
1868 vc->vc_decscnm = on_off;
1869 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1870 update_attr(vc);
1871 }
1872 break;
1873 case 6: /* Origin relative/absolute */
1874 vc->vc_decom = on_off;
1875 gotoxay(vc, 0, 0);
1876 break;
1877 case 7: /* Autowrap on/off */
1878 vc->vc_decawm = on_off;
1879 break;
1880 case 8: /* Autorepeat on/off */
1881 if (on_off)
1882 set_kbd(vc, decarm);
1883 else
1884 clr_kbd(vc, decarm);
1885 break;
1886 case 9:
1887 vc->vc_report_mouse = on_off ? 1 : 0;
1888 break;
1889 case 25: /* Cursor on/off */
1890 vc->vc_deccm = on_off;
1891 break;
1892 case 1000:
1893 vc->vc_report_mouse = on_off ? 2 : 0;
1894 break;
1895 }
1896 } else {
1897 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1898 case 3: /* Monitor (display ctrls) */
1899 vc->vc_disp_ctrl = on_off;
1900 break;
1901 case 4: /* Insert Mode on/off */
1902 vc->vc_decim = on_off;
1903 break;
1904 case 20: /* Lf, Enter == CrLf/Lf */
1905 if (on_off)
1906 set_kbd(vc, lnm);
1907 else
1908 clr_kbd(vc, lnm);
1909 break;
1910 }
1911 }
1912 }
1913
1914 /* console_lock is held */
1915 static void setterm_command(struct vc_data *vc)
1916 {
1917 switch (vc->vc_par[0]) {
1918 case 1: /* set color for underline mode */
1919 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1920 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1921 if (vc->vc_underline)
1922 update_attr(vc);
1923 }
1924 break;
1925 case 2: /* set color for half intensity mode */
1926 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1927 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1928 if (vc->vc_intensity == 0)
1929 update_attr(vc);
1930 }
1931 break;
1932 case 8: /* store colors as defaults */
1933 vc->vc_def_color = vc->vc_attr;
1934 if (vc->vc_hi_font_mask == 0x100)
1935 vc->vc_def_color >>= 1;
1936 default_attr(vc);
1937 update_attr(vc);
1938 break;
1939 case 9: /* set blanking interval */
1940 blankinterval = min(vc->vc_par[1], 60U) * 60;
1941 poke_blanked_console();
1942 break;
1943 case 10: /* set bell frequency in Hz */
1944 if (vc->vc_npar >= 1)
1945 vc->vc_bell_pitch = vc->vc_par[1];
1946 else
1947 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1948 break;
1949 case 11: /* set bell duration in msec */
1950 if (vc->vc_npar >= 1)
1951 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1952 msecs_to_jiffies(vc->vc_par[1]) : 0;
1953 else
1954 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1955 break;
1956 case 12: /* bring specified console to the front */
1957 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1958 set_console(vc->vc_par[1] - 1);
1959 break;
1960 case 13: /* unblank the screen */
1961 poke_blanked_console();
1962 break;
1963 case 14: /* set vesa powerdown interval */
1964 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
1965 break;
1966 case 15: /* activate the previous console */
1967 set_console(last_console);
1968 break;
1969 case 16: /* set cursor blink duration in msec */
1970 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1971 vc->vc_par[1] <= USHRT_MAX)
1972 vc->vc_cur_blink_ms = vc->vc_par[1];
1973 else
1974 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1975 break;
1976 }
1977 }
1978
1979 /* console_lock is held */
1980 static void csi_at(struct vc_data *vc, unsigned int nr)
1981 {
1982 if (nr > vc->vc_cols - vc->vc_x)
1983 nr = vc->vc_cols - vc->vc_x;
1984 else if (!nr)
1985 nr = 1;
1986 insert_char(vc, nr);
1987 }
1988
1989 /* console_lock is held */
1990 static void csi_L(struct vc_data *vc, unsigned int nr)
1991 {
1992 if (nr > vc->vc_rows - vc->vc_y)
1993 nr = vc->vc_rows - vc->vc_y;
1994 else if (!nr)
1995 nr = 1;
1996 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1997 vc->vc_need_wrap = 0;
1998 }
1999
2000 /* console_lock is held */
2001 static void csi_P(struct vc_data *vc, unsigned int nr)
2002 {
2003 if (nr > vc->vc_cols - vc->vc_x)
2004 nr = vc->vc_cols - vc->vc_x;
2005 else if (!nr)
2006 nr = 1;
2007 delete_char(vc, nr);
2008 }
2009
2010 /* console_lock is held */
2011 static void csi_M(struct vc_data *vc, unsigned int nr)
2012 {
2013 if (nr > vc->vc_rows - vc->vc_y)
2014 nr = vc->vc_rows - vc->vc_y;
2015 else if (!nr)
2016 nr=1;
2017 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
2018 vc->vc_need_wrap = 0;
2019 }
2020
2021 /* console_lock is held (except via vc_init->reset_terminal */
2022 static void save_cur(struct vc_data *vc)
2023 {
2024 vc->vc_saved_x = vc->vc_x;
2025 vc->vc_saved_y = vc->vc_y;
2026 vc->vc_s_intensity = vc->vc_intensity;
2027 vc->vc_s_italic = vc->vc_italic;
2028 vc->vc_s_underline = vc->vc_underline;
2029 vc->vc_s_blink = vc->vc_blink;
2030 vc->vc_s_reverse = vc->vc_reverse;
2031 vc->vc_s_charset = vc->vc_charset;
2032 vc->vc_s_color = vc->vc_color;
2033 vc->vc_saved_G0 = vc->vc_G0_charset;
2034 vc->vc_saved_G1 = vc->vc_G1_charset;
2035 }
2036
2037 /* console_lock is held */
2038 static void restore_cur(struct vc_data *vc)
2039 {
2040 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
2041 vc->vc_intensity = vc->vc_s_intensity;
2042 vc->vc_italic = vc->vc_s_italic;
2043 vc->vc_underline = vc->vc_s_underline;
2044 vc->vc_blink = vc->vc_s_blink;
2045 vc->vc_reverse = vc->vc_s_reverse;
2046 vc->vc_charset = vc->vc_s_charset;
2047 vc->vc_color = vc->vc_s_color;
2048 vc->vc_G0_charset = vc->vc_saved_G0;
2049 vc->vc_G1_charset = vc->vc_saved_G1;
2050 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
2051 update_attr(vc);
2052 vc->vc_need_wrap = 0;
2053 }
2054
2055 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2056 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2057 ESpalette, ESosc };
2058
2059 /* console_lock is held (except via vc_init()) */
2060 static void reset_terminal(struct vc_data *vc, int do_clear)
2061 {
2062 vc->vc_top = 0;
2063 vc->vc_bottom = vc->vc_rows;
2064 vc->vc_state = ESnormal;
2065 vc->vc_priv = EPecma;
2066 vc->vc_translate = set_translate(LAT1_MAP, vc);
2067 vc->vc_G0_charset = LAT1_MAP;
2068 vc->vc_G1_charset = GRAF_MAP;
2069 vc->vc_charset = 0;
2070 vc->vc_need_wrap = 0;
2071 vc->vc_report_mouse = 0;
2072 vc->vc_utf = default_utf8;
2073 vc->vc_utf_count = 0;
2074
2075 vc->vc_disp_ctrl = 0;
2076 vc->vc_toggle_meta = 0;
2077
2078 vc->vc_decscnm = 0;
2079 vc->vc_decom = 0;
2080 vc->vc_decawm = 1;
2081 vc->vc_deccm = global_cursor_default;
2082 vc->vc_decim = 0;
2083
2084 vt_reset_keyboard(vc->vc_num);
2085
2086 vc->vc_cursor_type = cur_default;
2087 vc->vc_complement_mask = vc->vc_s_complement_mask;
2088
2089 default_attr(vc);
2090 update_attr(vc);
2091
2092 vc->vc_tab_stop[0] =
2093 vc->vc_tab_stop[1] =
2094 vc->vc_tab_stop[2] =
2095 vc->vc_tab_stop[3] =
2096 vc->vc_tab_stop[4] =
2097 vc->vc_tab_stop[5] =
2098 vc->vc_tab_stop[6] =
2099 vc->vc_tab_stop[7] = 0x01010101;
2100
2101 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2102 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2103 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2104
2105 gotoxy(vc, 0, 0);
2106 save_cur(vc);
2107 if (do_clear)
2108 csi_J(vc, 2);
2109 }
2110
2111 /* console_lock is held */
2112 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2113 {
2114 /*
2115 * Control characters can be used in the _middle_
2116 * of an escape sequence.
2117 */
2118 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2119 return;
2120 switch (c) {
2121 case 0:
2122 return;
2123 case 7:
2124 if (vc->vc_state == ESosc)
2125 vc->vc_state = ESnormal;
2126 else if (vc->vc_bell_duration)
2127 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2128 return;
2129 case 8:
2130 bs(vc);
2131 return;
2132 case 9:
2133 vc->vc_pos -= (vc->vc_x << 1);
2134 while (vc->vc_x < vc->vc_cols - 1) {
2135 vc->vc_x++;
2136 if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
2137 break;
2138 }
2139 vc->vc_pos += (vc->vc_x << 1);
2140 notify_write(vc, '\t');
2141 return;
2142 case 10: case 11: case 12:
2143 lf(vc);
2144 if (!is_kbd(vc, lnm))
2145 return;
2146 /* fall through */
2147 case 13:
2148 cr(vc);
2149 return;
2150 case 14:
2151 vc->vc_charset = 1;
2152 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2153 vc->vc_disp_ctrl = 1;
2154 return;
2155 case 15:
2156 vc->vc_charset = 0;
2157 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2158 vc->vc_disp_ctrl = 0;
2159 return;
2160 case 24: case 26:
2161 vc->vc_state = ESnormal;
2162 return;
2163 case 27:
2164 vc->vc_state = ESesc;
2165 return;
2166 case 127:
2167 del(vc);
2168 return;
2169 case 128+27:
2170 vc->vc_state = ESsquare;
2171 return;
2172 }
2173 switch(vc->vc_state) {
2174 case ESesc:
2175 vc->vc_state = ESnormal;
2176 switch (c) {
2177 case '[':
2178 vc->vc_state = ESsquare;
2179 return;
2180 case ']':
2181 vc->vc_state = ESnonstd;
2182 return;
2183 case '%':
2184 vc->vc_state = ESpercent;
2185 return;
2186 case 'E':
2187 cr(vc);
2188 lf(vc);
2189 return;
2190 case 'M':
2191 ri(vc);
2192 return;
2193 case 'D':
2194 lf(vc);
2195 return;
2196 case 'H':
2197 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
2198 return;
2199 case 'Z':
2200 respond_ID(tty);
2201 return;
2202 case '7':
2203 save_cur(vc);
2204 return;
2205 case '8':
2206 restore_cur(vc);
2207 return;
2208 case '(':
2209 vc->vc_state = ESsetG0;
2210 return;
2211 case ')':
2212 vc->vc_state = ESsetG1;
2213 return;
2214 case '#':
2215 vc->vc_state = EShash;
2216 return;
2217 case 'c':
2218 reset_terminal(vc, 1);
2219 return;
2220 case '>': /* Numeric keypad */
2221 clr_kbd(vc, kbdapplic);
2222 return;
2223 case '=': /* Appl. keypad */
2224 set_kbd(vc, kbdapplic);
2225 return;
2226 }
2227 return;
2228 case ESnonstd:
2229 if (c=='P') { /* palette escape sequence */
2230 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2231 vc->vc_par[vc->vc_npar] = 0;
2232 vc->vc_npar = 0;
2233 vc->vc_state = ESpalette;
2234 return;
2235 } else if (c=='R') { /* reset palette */
2236 reset_palette(vc);
2237 vc->vc_state = ESnormal;
2238 } else if (c>='0' && c<='9')
2239 vc->vc_state = ESosc;
2240 else
2241 vc->vc_state = ESnormal;
2242 return;
2243 case ESpalette:
2244 if (isxdigit(c)) {
2245 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2246 if (vc->vc_npar == 7) {
2247 int i = vc->vc_par[0] * 3, j = 1;
2248 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2249 vc->vc_palette[i++] += vc->vc_par[j++];
2250 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2251 vc->vc_palette[i++] += vc->vc_par[j++];
2252 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2253 vc->vc_palette[i] += vc->vc_par[j];
2254 set_palette(vc);
2255 vc->vc_state = ESnormal;
2256 }
2257 } else
2258 vc->vc_state = ESnormal;
2259 return;
2260 case ESsquare:
2261 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2262 vc->vc_par[vc->vc_npar] = 0;
2263 vc->vc_npar = 0;
2264 vc->vc_state = ESgetpars;
2265 if (c == '[') { /* Function key */
2266 vc->vc_state=ESfunckey;
2267 return;
2268 }
2269 switch (c) {
2270 case '?':
2271 vc->vc_priv = EPdec;
2272 return;
2273 case '>':
2274 vc->vc_priv = EPgt;
2275 return;
2276 case '=':
2277 vc->vc_priv = EPeq;
2278 return;
2279 case '<':
2280 vc->vc_priv = EPlt;
2281 return;
2282 }
2283 vc->vc_priv = EPecma;
2284 /* fall through */
2285 case ESgetpars:
2286 if (c == ';' && vc->vc_npar < NPAR - 1) {
2287 vc->vc_npar++;
2288 return;
2289 } else if (c>='0' && c<='9') {
2290 vc->vc_par[vc->vc_npar] *= 10;
2291 vc->vc_par[vc->vc_npar] += c - '0';
2292 return;
2293 }
2294 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2295 vc->vc_state = EScsiignore;
2296 return;
2297 }
2298 vc->vc_state = ESnormal;
2299 switch(c) {
2300 case 'h':
2301 if (vc->vc_priv <= EPdec)
2302 set_mode(vc, 1);
2303 return;
2304 case 'l':
2305 if (vc->vc_priv <= EPdec)
2306 set_mode(vc, 0);
2307 return;
2308 case 'c':
2309 if (vc->vc_priv == EPdec) {
2310 if (vc->vc_par[0])
2311 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
2312 else
2313 vc->vc_cursor_type = cur_default;
2314 return;
2315 }
2316 break;
2317 case 'm':
2318 if (vc->vc_priv == EPdec) {
2319 clear_selection();
2320 if (vc->vc_par[0])
2321 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2322 else
2323 vc->vc_complement_mask = vc->vc_s_complement_mask;
2324 return;
2325 }
2326 break;
2327 case 'n':
2328 if (vc->vc_priv == EPecma) {
2329 if (vc->vc_par[0] == 5)
2330 status_report(tty);
2331 else if (vc->vc_par[0] == 6)
2332 cursor_report(vc, tty);
2333 }
2334 return;
2335 }
2336 if (vc->vc_priv != EPecma) {
2337 vc->vc_priv = EPecma;
2338 return;
2339 }
2340 switch(c) {
2341 case 'G': case '`':
2342 if (vc->vc_par[0])
2343 vc->vc_par[0]--;
2344 gotoxy(vc, vc->vc_par[0], vc->vc_y);
2345 return;
2346 case 'A':
2347 if (!vc->vc_par[0])
2348 vc->vc_par[0]++;
2349 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2350 return;
2351 case 'B': case 'e':
2352 if (!vc->vc_par[0])
2353 vc->vc_par[0]++;
2354 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2355 return;
2356 case 'C': case 'a':
2357 if (!vc->vc_par[0])
2358 vc->vc_par[0]++;
2359 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2360 return;
2361 case 'D':
2362 if (!vc->vc_par[0])
2363 vc->vc_par[0]++;
2364 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2365 return;
2366 case 'E':
2367 if (!vc->vc_par[0])
2368 vc->vc_par[0]++;
2369 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2370 return;
2371 case 'F':
2372 if (!vc->vc_par[0])
2373 vc->vc_par[0]++;
2374 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2375 return;
2376 case 'd':
2377 if (vc->vc_par[0])
2378 vc->vc_par[0]--;
2379 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2380 return;
2381 case 'H': case 'f':
2382 if (vc->vc_par[0])
2383 vc->vc_par[0]--;
2384 if (vc->vc_par[1])
2385 vc->vc_par[1]--;
2386 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2387 return;
2388 case 'J':
2389 csi_J(vc, vc->vc_par[0]);
2390 return;
2391 case 'K':
2392 csi_K(vc, vc->vc_par[0]);
2393 return;
2394 case 'L':
2395 csi_L(vc, vc->vc_par[0]);
2396 return;
2397 case 'M':
2398 csi_M(vc, vc->vc_par[0]);
2399 return;
2400 case 'P':
2401 csi_P(vc, vc->vc_par[0]);
2402 return;
2403 case 'c':
2404 if (!vc->vc_par[0])
2405 respond_ID(tty);
2406 return;
2407 case 'g':
2408 if (!vc->vc_par[0])
2409 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2410 else if (vc->vc_par[0] == 3) {
2411 vc->vc_tab_stop[0] =
2412 vc->vc_tab_stop[1] =
2413 vc->vc_tab_stop[2] =
2414 vc->vc_tab_stop[3] =
2415 vc->vc_tab_stop[4] =
2416 vc->vc_tab_stop[5] =
2417 vc->vc_tab_stop[6] =
2418 vc->vc_tab_stop[7] = 0;
2419 }
2420 return;
2421 case 'm':
2422 csi_m(vc);
2423 return;
2424 case 'q': /* DECLL - but only 3 leds */
2425 /* map 0,1,2,3 to 0,1,2,4 */
2426 if (vc->vc_par[0] < 4)
2427 vt_set_led_state(vc->vc_num,
2428 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2429 return;
2430 case 'r':
2431 if (!vc->vc_par[0])
2432 vc->vc_par[0]++;
2433 if (!vc->vc_par[1])
2434 vc->vc_par[1] = vc->vc_rows;
2435 /* Minimum allowed region is 2 lines */
2436 if (vc->vc_par[0] < vc->vc_par[1] &&
2437 vc->vc_par[1] <= vc->vc_rows) {
2438 vc->vc_top = vc->vc_par[0] - 1;
2439 vc->vc_bottom = vc->vc_par[1];
2440 gotoxay(vc, 0, 0);
2441 }
2442 return;
2443 case 's':
2444 save_cur(vc);
2445 return;
2446 case 'u':
2447 restore_cur(vc);
2448 return;
2449 case 'X':
2450 csi_X(vc, vc->vc_par[0]);
2451 return;
2452 case '@':
2453 csi_at(vc, vc->vc_par[0]);
2454 return;
2455 case ']': /* setterm functions */
2456 setterm_command(vc);
2457 return;
2458 }
2459 return;
2460 case EScsiignore:
2461 if (c >= 20 && c <= 0x3f)
2462 return;
2463 vc->vc_state = ESnormal;
2464 return;
2465 case ESpercent:
2466 vc->vc_state = ESnormal;
2467 switch (c) {
2468 case '@': /* defined in ISO 2022 */
2469 vc->vc_utf = 0;
2470 return;
2471 case 'G': /* prelim official escape code */
2472 case '8': /* retained for compatibility */
2473 vc->vc_utf = 1;
2474 return;
2475 }
2476 return;
2477 case ESfunckey:
2478 vc->vc_state = ESnormal;
2479 return;
2480 case EShash:
2481 vc->vc_state = ESnormal;
2482 if (c == '8') {
2483 /* DEC screen alignment test. kludge :-) */
2484 vc->vc_video_erase_char =
2485 (vc->vc_video_erase_char & 0xff00) | 'E';
2486 csi_J(vc, 2);
2487 vc->vc_video_erase_char =
2488 (vc->vc_video_erase_char & 0xff00) | ' ';
2489 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2490 }
2491 return;
2492 case ESsetG0:
2493 if (c == '0')
2494 vc->vc_G0_charset = GRAF_MAP;
2495 else if (c == 'B')
2496 vc->vc_G0_charset = LAT1_MAP;
2497 else if (c == 'U')
2498 vc->vc_G0_charset = IBMPC_MAP;
2499 else if (c == 'K')
2500 vc->vc_G0_charset = USER_MAP;
2501 if (vc->vc_charset == 0)
2502 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2503 vc->vc_state = ESnormal;
2504 return;
2505 case ESsetG1:
2506 if (c == '0')
2507 vc->vc_G1_charset = GRAF_MAP;
2508 else if (c == 'B')
2509 vc->vc_G1_charset = LAT1_MAP;
2510 else if (c == 'U')
2511 vc->vc_G1_charset = IBMPC_MAP;
2512 else if (c == 'K')
2513 vc->vc_G1_charset = USER_MAP;
2514 if (vc->vc_charset == 1)
2515 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2516 vc->vc_state = ESnormal;
2517 return;
2518 case ESosc:
2519 return;
2520 default:
2521 vc->vc_state = ESnormal;
2522 }
2523 }
2524
2525 /* is_double_width() is based on the wcwidth() implementation by
2526 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2527 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2528 */
2529 struct interval {
2530 uint32_t first;
2531 uint32_t last;
2532 };
2533
2534 static int ucs_cmp(const void *key, const void *elt)
2535 {
2536 uint32_t ucs = *(uint32_t *)key;
2537 struct interval e = *(struct interval *) elt;
2538
2539 if (ucs > e.last)
2540 return 1;
2541 else if (ucs < e.first)
2542 return -1;
2543 return 0;
2544 }
2545
2546 static int is_double_width(uint32_t ucs)
2547 {
2548 static const struct interval double_width[] = {
2549 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2550 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2551 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2552 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2553 };
2554 if (ucs < double_width[0].first ||
2555 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2556 return 0;
2557
2558 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2559 sizeof(struct interval), ucs_cmp) != NULL;
2560 }
2561
2562 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2563 unsigned long draw_to, int *draw_x)
2564 {
2565 if (*draw_x < 0)
2566 return;
2567
2568 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2569 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2570 *draw_x = -1;
2571 }
2572
2573 /* acquires console_lock */
2574 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2575 {
2576 int c, next_c, tc, ok, n = 0, draw_x = -1;
2577 unsigned int currcons;
2578 unsigned long draw_from = 0, draw_to = 0;
2579 struct vc_data *vc;
2580 unsigned char vc_attr;
2581 struct vt_notifier_param param;
2582 uint8_t rescan;
2583 uint8_t inverse;
2584 uint8_t width;
2585 u16 himask, charmask;
2586
2587 if (in_interrupt())
2588 return count;
2589
2590 console_lock();
2591 vc = tty->driver_data;
2592 if (vc == NULL) {
2593 pr_err("vt: argh, driver_data is NULL !\n");
2594 console_unlock();
2595 return 0;
2596 }
2597
2598 currcons = vc->vc_num;
2599 if (!vc_cons_allocated(currcons)) {
2600 /* could this happen? */
2601 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2602 console_unlock();
2603 return 0;
2604 }
2605
2606 himask = vc->vc_hi_font_mask;
2607 charmask = himask ? 0x1ff : 0xff;
2608
2609 /* undraw cursor first */
2610 if (con_is_fg(vc))
2611 hide_cursor(vc);
2612
2613 param.vc = vc;
2614
2615 while (!tty->stopped && count) {
2616 int orig = *buf;
2617 c = orig;
2618 buf++;
2619 n++;
2620 count--;
2621 rescan = 0;
2622 inverse = 0;
2623 width = 1;
2624
2625 /* Do no translation at all in control states */
2626 if (vc->vc_state != ESnormal) {
2627 tc = c;
2628 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2629 /* Combine UTF-8 into Unicode in vc_utf_char.
2630 * vc_utf_count is the number of continuation bytes still
2631 * expected to arrive.
2632 * vc_npar is the number of continuation bytes arrived so
2633 * far
2634 */
2635 rescan_last_byte:
2636 if ((c & 0xc0) == 0x80) {
2637 /* Continuation byte received */
2638 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2639 if (vc->vc_utf_count) {
2640 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2641 vc->vc_npar++;
2642 if (--vc->vc_utf_count) {
2643 /* Still need some bytes */
2644 continue;
2645 }
2646 /* Got a whole character */
2647 c = vc->vc_utf_char;
2648 /* Reject overlong sequences */
2649 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2650 c > utf8_length_changes[vc->vc_npar])
2651 c = 0xfffd;
2652 } else {
2653 /* Unexpected continuation byte */
2654 vc->vc_utf_count = 0;
2655 c = 0xfffd;
2656 }
2657 } else {
2658 /* Single ASCII byte or first byte of a sequence received */
2659 if (vc->vc_utf_count) {
2660 /* Continuation byte expected */
2661 rescan = 1;
2662 vc->vc_utf_count = 0;
2663 c = 0xfffd;
2664 } else if (c > 0x7f) {
2665 /* First byte of a multibyte sequence received */
2666 vc->vc_npar = 0;
2667 if ((c & 0xe0) == 0xc0) {
2668 vc->vc_utf_count = 1;
2669 vc->vc_utf_char = (c & 0x1f);
2670 } else if ((c & 0xf0) == 0xe0) {
2671 vc->vc_utf_count = 2;
2672 vc->vc_utf_char = (c & 0x0f);
2673 } else if ((c & 0xf8) == 0xf0) {
2674 vc->vc_utf_count = 3;
2675 vc->vc_utf_char = (c & 0x07);
2676 } else if ((c & 0xfc) == 0xf8) {
2677 vc->vc_utf_count = 4;
2678 vc->vc_utf_char = (c & 0x03);
2679 } else if ((c & 0xfe) == 0xfc) {
2680 vc->vc_utf_count = 5;
2681 vc->vc_utf_char = (c & 0x01);
2682 } else {
2683 /* 254 and 255 are invalid */
2684 c = 0xfffd;
2685 }
2686 if (vc->vc_utf_count) {
2687 /* Still need some bytes */
2688 continue;
2689 }
2690 }
2691 /* Nothing to do if an ASCII byte was received */
2692 }
2693 /* End of UTF-8 decoding. */
2694 /* c is the received character, or U+FFFD for invalid sequences. */
2695 /* Replace invalid Unicode code points with U+FFFD too */
2696 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2697 c = 0xfffd;
2698 tc = c;
2699 } else { /* no utf or alternate charset mode */
2700 tc = vc_translate(vc, c);
2701 }
2702
2703 param.c = tc;
2704 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2705 &param) == NOTIFY_STOP)
2706 continue;
2707
2708 /* If the original code was a control character we
2709 * only allow a glyph to be displayed if the code is
2710 * not normally used (such as for cursor movement) or
2711 * if the disp_ctrl mode has been explicitly enabled.
2712 * Certain characters (as given by the CTRL_ALWAYS
2713 * bitmap) are always displayed as control characters,
2714 * as the console would be pretty useless without
2715 * them; to display an arbitrary font position use the
2716 * direct-to-font zone in UTF-8 mode.
2717 */
2718 ok = tc && (c >= 32 ||
2719 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2720 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2721 && (c != 127 || vc->vc_disp_ctrl)
2722 && (c != 128+27);
2723
2724 if (vc->vc_state == ESnormal && ok) {
2725 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2726 if (is_double_width(c))
2727 width = 2;
2728 }
2729 /* Now try to find out how to display it */
2730 tc = conv_uni_to_pc(vc, tc);
2731 if (tc & ~charmask) {
2732 if (tc == -1 || tc == -2) {
2733 continue; /* nothing to display */
2734 }
2735 /* Glyph not found */
2736 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2737 /* In legacy mode use the glyph we get by a 1:1 mapping.
2738 This would make absolutely no sense with Unicode in mind,
2739 but do this for ASCII characters since a font may lack
2740 Unicode mapping info and we don't want to end up with
2741 having question marks only. */
2742 tc = c;
2743 } else {
2744 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2745 tc = conv_uni_to_pc(vc, 0xfffd);
2746 if (tc < 0) {
2747 inverse = 1;
2748 tc = conv_uni_to_pc(vc, '?');
2749 if (tc < 0) tc = '?';
2750 }
2751 }
2752 }
2753
2754 if (!inverse) {
2755 vc_attr = vc->vc_attr;
2756 } else {
2757 /* invert vc_attr */
2758 if (!vc->vc_can_do_color) {
2759 vc_attr = (vc->vc_attr) ^ 0x08;
2760 } else if (vc->vc_hi_font_mask == 0x100) {
2761 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2762 } else {
2763 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2764 }
2765 con_flush(vc, draw_from, draw_to, &draw_x);
2766 }
2767
2768 next_c = c;
2769 while (1) {
2770 if (vc->vc_need_wrap || vc->vc_decim)
2771 con_flush(vc, draw_from, draw_to,
2772 &draw_x);
2773 if (vc->vc_need_wrap) {
2774 cr(vc);
2775 lf(vc);
2776 }
2777 if (vc->vc_decim)
2778 insert_char(vc, 1);
2779 vc_uniscr_putc(vc, next_c);
2780 scr_writew(himask ?
2781 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2782 (vc_attr << 8) + tc,
2783 (u16 *) vc->vc_pos);
2784 if (con_should_update(vc) && draw_x < 0) {
2785 draw_x = vc->vc_x;
2786 draw_from = vc->vc_pos;
2787 }
2788 if (vc->vc_x == vc->vc_cols - 1) {
2789 vc->vc_need_wrap = vc->vc_decawm;
2790 draw_to = vc->vc_pos + 2;
2791 } else {
2792 vc->vc_x++;
2793 draw_to = (vc->vc_pos += 2);
2794 }
2795
2796 if (!--width) break;
2797
2798 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2799 if (tc < 0) tc = ' ';
2800 next_c = ' ';
2801 }
2802 notify_write(vc, c);
2803
2804 if (inverse)
2805 con_flush(vc, draw_from, draw_to, &draw_x);
2806
2807 if (rescan) {
2808 rescan = 0;
2809 inverse = 0;
2810 width = 1;
2811 c = orig;
2812 goto rescan_last_byte;
2813 }
2814 continue;
2815 }
2816 con_flush(vc, draw_from, draw_to, &draw_x);
2817 do_con_trol(tty, vc, orig);
2818 }
2819 con_flush(vc, draw_from, draw_to, &draw_x);
2820 vc_uniscr_debug_check(vc);
2821 console_conditional_schedule();
2822 notify_update(vc);
2823 console_unlock();
2824 return n;
2825 }
2826
2827 /*
2828 * This is the console switching callback.
2829 *
2830 * Doing console switching in a process context allows
2831 * us to do the switches asynchronously (needed when we want
2832 * to switch due to a keyboard interrupt). Synchronization
2833 * with other console code and prevention of re-entrancy is
2834 * ensured with console_lock.
2835 */
2836 static void console_callback(struct work_struct *ignored)
2837 {
2838 console_lock();
2839
2840 if (want_console >= 0) {
2841 if (want_console != fg_console &&
2842 vc_cons_allocated(want_console)) {
2843 hide_cursor(vc_cons[fg_console].d);
2844 change_console(vc_cons[want_console].d);
2845 /* we only changed when the console had already
2846 been allocated - a new console is not created
2847 in an interrupt routine */
2848 }
2849 want_console = -1;
2850 }
2851 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2852 do_poke_blanked_console = 0;
2853 poke_blanked_console();
2854 }
2855 if (scrollback_delta) {
2856 struct vc_data *vc = vc_cons[fg_console].d;
2857 clear_selection();
2858 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2859 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2860 scrollback_delta = 0;
2861 }
2862 if (blank_timer_expired) {
2863 do_blank_screen(0);
2864 blank_timer_expired = 0;
2865 }
2866 notify_update(vc_cons[fg_console].d);
2867
2868 console_unlock();
2869 }
2870
2871 int set_console(int nr)
2872 {
2873 struct vc_data *vc = vc_cons[fg_console].d;
2874
2875 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2876 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2877
2878 /*
2879 * Console switch will fail in console_callback() or
2880 * change_console() so there is no point scheduling
2881 * the callback
2882 *
2883 * Existing set_console() users don't check the return
2884 * value so this shouldn't break anything
2885 */
2886 return -EINVAL;
2887 }
2888
2889 want_console = nr;
2890 schedule_console_callback();
2891
2892 return 0;
2893 }
2894
2895 struct tty_driver *console_driver;
2896
2897 #ifdef CONFIG_VT_CONSOLE
2898
2899 /**
2900 * vt_kmsg_redirect() - Sets/gets the kernel message console
2901 * @new: The new virtual terminal number or -1 if the console should stay
2902 * unchanged
2903 *
2904 * By default, the kernel messages are always printed on the current virtual
2905 * console. However, the user may modify that default with the
2906 * TIOCL_SETKMSGREDIRECT ioctl call.
2907 *
2908 * This function sets the kernel message console to be @new. It returns the old
2909 * virtual console number. The virtual terminal number 0 (both as parameter and
2910 * return value) means no redirection (i.e. always printed on the currently
2911 * active console).
2912 *
2913 * The parameter -1 means that only the current console is returned, but the
2914 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2915 * case to make the code more understandable.
2916 *
2917 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2918 * the parameter and always returns 0.
2919 */
2920 int vt_kmsg_redirect(int new)
2921 {
2922 static int kmsg_con;
2923
2924 if (new != -1)
2925 return xchg(&kmsg_con, new);
2926 else
2927 return kmsg_con;
2928 }
2929
2930 /*
2931 * Console on virtual terminal
2932 *
2933 * The console must be locked when we get here.
2934 */
2935
2936 static void vt_console_print(struct console *co, const char *b, unsigned count)
2937 {
2938 struct vc_data *vc = vc_cons[fg_console].d;
2939 unsigned char c;
2940 static DEFINE_SPINLOCK(printing_lock);
2941 const ushort *start;
2942 ushort start_x, cnt;
2943 int kmsg_console;
2944
2945 /* console busy or not yet initialized */
2946 if (!printable)
2947 return;
2948 if (!spin_trylock(&printing_lock))
2949 return;
2950
2951 kmsg_console = vt_get_kmsg_redirect();
2952 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2953 vc = vc_cons[kmsg_console - 1].d;
2954
2955 if (!vc_cons_allocated(fg_console)) {
2956 /* impossible */
2957 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2958 goto quit;
2959 }
2960
2961 if (vc->vc_mode != KD_TEXT)
2962 goto quit;
2963
2964 /* undraw cursor first */
2965 if (con_is_fg(vc))
2966 hide_cursor(vc);
2967
2968 start = (ushort *)vc->vc_pos;
2969 start_x = vc->vc_x;
2970 cnt = 0;
2971 while (count--) {
2972 c = *b++;
2973 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2974 if (cnt && con_is_visible(vc))
2975 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2976 cnt = 0;
2977 if (c == 8) { /* backspace */
2978 bs(vc);
2979 start = (ushort *)vc->vc_pos;
2980 start_x = vc->vc_x;
2981 continue;
2982 }
2983 if (c != 13)
2984 lf(vc);
2985 cr(vc);
2986 start = (ushort *)vc->vc_pos;
2987 start_x = vc->vc_x;
2988 if (c == 10 || c == 13)
2989 continue;
2990 }
2991 vc_uniscr_putc(vc, c);
2992 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2993 notify_write(vc, c);
2994 cnt++;
2995 if (vc->vc_x == vc->vc_cols - 1) {
2996 vc->vc_need_wrap = 1;
2997 } else {
2998 vc->vc_pos += 2;
2999 vc->vc_x++;
3000 }
3001 }
3002 if (cnt && con_is_visible(vc))
3003 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
3004 set_cursor(vc);
3005 notify_update(vc);
3006
3007 quit:
3008 spin_unlock(&printing_lock);
3009 }
3010
3011 static struct tty_driver *vt_console_device(struct console *c, int *index)
3012 {
3013 *index = c->index ? c->index-1 : fg_console;
3014 return console_driver;
3015 }
3016
3017 static struct console vt_console_driver = {
3018 .name = "tty",
3019 .write = vt_console_print,
3020 .device = vt_console_device,
3021 .unblank = unblank_screen,
3022 .flags = CON_PRINTBUFFER,
3023 .index = -1,
3024 };
3025 #endif
3026
3027 /*
3028 * Handling of Linux-specific VC ioctls
3029 */
3030
3031 /*
3032 * Generally a bit racy with respect to console_lock();.
3033 *
3034 * There are some functions which don't need it.
3035 *
3036 * There are some functions which can sleep for arbitrary periods
3037 * (paste_selection) but we don't need the lock there anyway.
3038 *
3039 * set_selection_user has locking, and definitely needs it
3040 */
3041
3042 int tioclinux(struct tty_struct *tty, unsigned long arg)
3043 {
3044 char type, data;
3045 char __user *p = (char __user *)arg;
3046 int lines;
3047 int ret;
3048
3049 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3050 return -EPERM;
3051 if (get_user(type, p))
3052 return -EFAULT;
3053 ret = 0;
3054
3055 switch (type)
3056 {
3057 case TIOCL_SETSEL:
3058 ret = set_selection_user((struct tiocl_selection
3059 __user *)(p+1), tty);
3060 break;
3061 case TIOCL_PASTESEL:
3062 ret = paste_selection(tty);
3063 break;
3064 case TIOCL_UNBLANKSCREEN:
3065 console_lock();
3066 unblank_screen();
3067 console_unlock();
3068 break;
3069 case TIOCL_SELLOADLUT:
3070 console_lock();
3071 ret = sel_loadlut(p);
3072 console_unlock();
3073 break;
3074 case TIOCL_GETSHIFTSTATE:
3075
3076 /*
3077 * Make it possible to react to Shift+Mousebutton.
3078 * Note that 'shift_state' is an undocumented
3079 * kernel-internal variable; programs not closely
3080 * related to the kernel should not use this.
3081 */
3082 data = vt_get_shift_state();
3083 ret = put_user(data, p);
3084 break;
3085 case TIOCL_GETMOUSEREPORTING:
3086 console_lock(); /* May be overkill */
3087 data = mouse_reporting();
3088 console_unlock();
3089 ret = put_user(data, p);
3090 break;
3091 case TIOCL_SETVESABLANK:
3092 console_lock();
3093 ret = set_vesa_blanking(p);
3094 console_unlock();
3095 break;
3096 case TIOCL_GETKMSGREDIRECT:
3097 data = vt_get_kmsg_redirect();
3098 ret = put_user(data, p);
3099 break;
3100 case TIOCL_SETKMSGREDIRECT:
3101 if (!capable(CAP_SYS_ADMIN)) {
3102 ret = -EPERM;
3103 } else {
3104 if (get_user(data, p+1))
3105 ret = -EFAULT;
3106 else
3107 vt_kmsg_redirect(data);
3108 }
3109 break;
3110 case TIOCL_GETFGCONSOLE:
3111 /* No locking needed as this is a transiently
3112 correct return anyway if the caller hasn't
3113 disabled switching */
3114 ret = fg_console;
3115 break;
3116 case TIOCL_SCROLLCONSOLE:
3117 if (get_user(lines, (s32 __user *)(p+4))) {
3118 ret = -EFAULT;
3119 } else {
3120 /* Need the console lock here. Note that lots
3121 of other calls need fixing before the lock
3122 is actually useful ! */
3123 console_lock();
3124 scrollfront(vc_cons[fg_console].d, lines);
3125 console_unlock();
3126 ret = 0;
3127 }
3128 break;
3129 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3130 console_lock();
3131 ignore_poke = 1;
3132 do_blank_screen(0);
3133 console_unlock();
3134 break;
3135 case TIOCL_BLANKEDSCREEN:
3136 ret = console_blanked;
3137 break;
3138 default:
3139 ret = -EINVAL;
3140 break;
3141 }
3142 return ret;
3143 }
3144
3145 /*
3146 * /dev/ttyN handling
3147 */
3148
3149 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3150 {
3151 int retval;
3152
3153 retval = do_con_write(tty, buf, count);
3154 con_flush_chars(tty);
3155
3156 return retval;
3157 }
3158
3159 static int con_put_char(struct tty_struct *tty, unsigned char ch)
3160 {
3161 if (in_interrupt())
3162 return 0; /* n_r3964 calls put_char() from interrupt context */
3163 return do_con_write(tty, &ch, 1);
3164 }
3165
3166 static int con_write_room(struct tty_struct *tty)
3167 {
3168 if (tty->stopped)
3169 return 0;
3170 return 32768; /* No limit, really; we're not buffering */
3171 }
3172
3173 static int con_chars_in_buffer(struct tty_struct *tty)
3174 {
3175 return 0; /* we're not buffering */
3176 }
3177
3178 /*
3179 * con_throttle and con_unthrottle are only used for
3180 * paste_selection(), which has to stuff in a large number of
3181 * characters...
3182 */
3183 static void con_throttle(struct tty_struct *tty)
3184 {
3185 }
3186
3187 static void con_unthrottle(struct tty_struct *tty)
3188 {
3189 struct vc_data *vc = tty->driver_data;
3190
3191 wake_up_interruptible(&vc->paste_wait);
3192 }
3193
3194 /*
3195 * Turn the Scroll-Lock LED on when the tty is stopped
3196 */
3197 static void con_stop(struct tty_struct *tty)
3198 {
3199 int console_num;
3200 if (!tty)
3201 return;
3202 console_num = tty->index;
3203 if (!vc_cons_allocated(console_num))
3204 return;
3205 vt_kbd_con_stop(console_num);
3206 }
3207
3208 /*
3209 * Turn the Scroll-Lock LED off when the console is started
3210 */
3211 static void con_start(struct tty_struct *tty)
3212 {
3213 int console_num;
3214 if (!tty)
3215 return;
3216 console_num = tty->index;
3217 if (!vc_cons_allocated(console_num))
3218 return;
3219 vt_kbd_con_start(console_num);
3220 }
3221
3222 static void con_flush_chars(struct tty_struct *tty)
3223 {
3224 struct vc_data *vc;
3225
3226 if (in_interrupt()) /* from flush_to_ldisc */
3227 return;
3228
3229 /* if we race with con_close(), vt may be null */
3230 console_lock();
3231 vc = tty->driver_data;
3232 if (vc)
3233 set_cursor(vc);
3234 console_unlock();
3235 }
3236
3237 /*
3238 * Allocate the console screen memory.
3239 */
3240 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3241 {
3242 unsigned int currcons = tty->index;
3243 struct vc_data *vc;
3244 int ret;
3245
3246 console_lock();
3247 ret = vc_allocate(currcons);
3248 if (ret)
3249 goto unlock;
3250
3251 vc = vc_cons[currcons].d;
3252
3253 /* Still being freed */
3254 if (vc->port.tty) {
3255 ret = -ERESTARTSYS;
3256 goto unlock;
3257 }
3258
3259 ret = tty_port_install(&vc->port, driver, tty);
3260 if (ret)
3261 goto unlock;
3262
3263 tty->driver_data = vc;
3264 vc->port.tty = tty;
3265 tty_port_get(&vc->port);
3266
3267 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3268 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3269 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3270 }
3271 if (vc->vc_utf)
3272 tty->termios.c_iflag |= IUTF8;
3273 else
3274 tty->termios.c_iflag &= ~IUTF8;
3275 unlock:
3276 console_unlock();
3277 return ret;
3278 }
3279
3280 static int con_open(struct tty_struct *tty, struct file *filp)
3281 {
3282 /* everything done in install */
3283 return 0;
3284 }
3285
3286
3287 static void con_close(struct tty_struct *tty, struct file *filp)
3288 {
3289 /* Nothing to do - we defer to shutdown */
3290 }
3291
3292 static void con_shutdown(struct tty_struct *tty)
3293 {
3294 struct vc_data *vc = tty->driver_data;
3295 BUG_ON(vc == NULL);
3296 console_lock();
3297 vc->port.tty = NULL;
3298 console_unlock();
3299 }
3300
3301 static void con_cleanup(struct tty_struct *tty)
3302 {
3303 struct vc_data *vc = tty->driver_data;
3304
3305 tty_port_put(&vc->port);
3306 }
3307
3308 static int default_color = 7; /* white */
3309 static int default_italic_color = 2; // green (ASCII)
3310 static int default_underline_color = 3; // cyan (ASCII)
3311 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3312 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3313 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3314
3315 static void vc_init(struct vc_data *vc, unsigned int rows,
3316 unsigned int cols, int do_clear)
3317 {
3318 int j, k ;
3319
3320 vc->vc_cols = cols;
3321 vc->vc_rows = rows;
3322 vc->vc_size_row = cols << 1;
3323 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3324
3325 set_origin(vc);
3326 vc->vc_pos = vc->vc_origin;
3327 reset_vc(vc);
3328 for (j=k=0; j<16; j++) {
3329 vc->vc_palette[k++] = default_red[j] ;
3330 vc->vc_palette[k++] = default_grn[j] ;
3331 vc->vc_palette[k++] = default_blu[j] ;
3332 }
3333 vc->vc_def_color = default_color;
3334 vc->vc_ulcolor = default_underline_color;
3335 vc->vc_itcolor = default_italic_color;
3336 vc->vc_halfcolor = 0x08; /* grey */
3337 init_waitqueue_head(&vc->paste_wait);
3338 reset_terminal(vc, do_clear);
3339 }
3340
3341 /*
3342 * This routine initializes console interrupts, and does nothing
3343 * else. If you want the screen to clear, call tty_write with
3344 * the appropriate escape-sequence.
3345 */
3346
3347 static int __init con_init(void)
3348 {
3349 const char *display_desc = NULL;
3350 struct vc_data *vc;
3351 unsigned int currcons = 0, i;
3352
3353 console_lock();
3354
3355 if (!conswitchp)
3356 conswitchp = &dummy_con;
3357 display_desc = conswitchp->con_startup();
3358 if (!display_desc) {
3359 fg_console = 0;
3360 console_unlock();
3361 return 0;
3362 }
3363
3364 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3365 struct con_driver *con_driver = &registered_con_driver[i];
3366
3367 if (con_driver->con == NULL) {
3368 con_driver->con = conswitchp;
3369 con_driver->desc = display_desc;
3370 con_driver->flag = CON_DRIVER_FLAG_INIT;
3371 con_driver->first = 0;
3372 con_driver->last = MAX_NR_CONSOLES - 1;
3373 break;
3374 }
3375 }
3376
3377 for (i = 0; i < MAX_NR_CONSOLES; i++)
3378 con_driver_map[i] = conswitchp;
3379
3380 if (blankinterval) {
3381 blank_state = blank_normal_wait;
3382 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3383 }
3384
3385 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3386 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3387 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3388 tty_port_init(&vc->port);
3389 visual_init(vc, currcons, 1);
3390 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3391 vc_init(vc, vc->vc_rows, vc->vc_cols,
3392 currcons || !vc->vc_sw->con_save_screen);
3393 }
3394 currcons = fg_console = 0;
3395 master_display_fg = vc = vc_cons[currcons].d;
3396 set_origin(vc);
3397 save_screen(vc);
3398 gotoxy(vc, vc->vc_x, vc->vc_y);
3399 csi_J(vc, 0);
3400 update_screen(vc);
3401 pr_info("Console: %s %s %dx%d\n",
3402 vc->vc_can_do_color ? "colour" : "mono",
3403 display_desc, vc->vc_cols, vc->vc_rows);
3404 printable = 1;
3405
3406 console_unlock();
3407
3408 #ifdef CONFIG_VT_CONSOLE
3409 register_console(&vt_console_driver);
3410 #endif
3411 return 0;
3412 }
3413 console_initcall(con_init);
3414
3415 static const struct tty_operations con_ops = {
3416 .install = con_install,
3417 .open = con_open,
3418 .close = con_close,
3419 .write = con_write,
3420 .write_room = con_write_room,
3421 .put_char = con_put_char,
3422 .flush_chars = con_flush_chars,
3423 .chars_in_buffer = con_chars_in_buffer,
3424 .ioctl = vt_ioctl,
3425 #ifdef CONFIG_COMPAT
3426 .compat_ioctl = vt_compat_ioctl,
3427 #endif
3428 .stop = con_stop,
3429 .start = con_start,
3430 .throttle = con_throttle,
3431 .unthrottle = con_unthrottle,
3432 .resize = vt_resize,
3433 .shutdown = con_shutdown,
3434 .cleanup = con_cleanup,
3435 };
3436
3437 static struct cdev vc0_cdev;
3438
3439 static ssize_t show_tty_active(struct device *dev,
3440 struct device_attribute *attr, char *buf)
3441 {
3442 return sprintf(buf, "tty%d\n", fg_console + 1);
3443 }
3444 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3445
3446 static struct attribute *vt_dev_attrs[] = {
3447 &dev_attr_active.attr,
3448 NULL
3449 };
3450
3451 ATTRIBUTE_GROUPS(vt_dev);
3452
3453 int __init vty_init(const struct file_operations *console_fops)
3454 {
3455 cdev_init(&vc0_cdev, console_fops);
3456 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3457 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3458 panic("Couldn't register /dev/tty0 driver\n");
3459 tty0dev = device_create_with_groups(tty_class, NULL,
3460 MKDEV(TTY_MAJOR, 0), NULL,
3461 vt_dev_groups, "tty0");
3462 if (IS_ERR(tty0dev))
3463 tty0dev = NULL;
3464
3465 vcs_init();
3466
3467 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3468 if (!console_driver)
3469 panic("Couldn't allocate console driver\n");
3470
3471 console_driver->name = "tty";
3472 console_driver->name_base = 1;
3473 console_driver->major = TTY_MAJOR;
3474 console_driver->minor_start = 1;
3475 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3476 console_driver->init_termios = tty_std_termios;
3477 if (default_utf8)
3478 console_driver->init_termios.c_iflag |= IUTF8;
3479 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3480 tty_set_operations(console_driver, &con_ops);
3481 if (tty_register_driver(console_driver))
3482 panic("Couldn't register console driver\n");
3483 kbd_init();
3484 console_map_init();
3485 #ifdef CONFIG_MDA_CONSOLE
3486 mda_console_init();
3487 #endif
3488 return 0;
3489 }
3490
3491 #ifndef VT_SINGLE_DRIVER
3492
3493 static struct class *vtconsole_class;
3494
3495 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3496 int deflt)
3497 {
3498 struct module *owner = csw->owner;
3499 const char *desc = NULL;
3500 struct con_driver *con_driver;
3501 int i, j = -1, k = -1, retval = -ENODEV;
3502
3503 if (!try_module_get(owner))
3504 return -ENODEV;
3505
3506 WARN_CONSOLE_UNLOCKED();
3507
3508 /* check if driver is registered */
3509 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3510 con_driver = &registered_con_driver[i];
3511
3512 if (con_driver->con == csw) {
3513 desc = con_driver->desc;
3514 retval = 0;
3515 break;
3516 }
3517 }
3518
3519 if (retval)
3520 goto err;
3521
3522 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3523 csw->con_startup();
3524 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3525 }
3526
3527 if (deflt) {
3528 if (conswitchp)
3529 module_put(conswitchp->owner);
3530
3531 __module_get(owner);
3532 conswitchp = csw;
3533 }
3534
3535 first = max(first, con_driver->first);
3536 last = min(last, con_driver->last);
3537
3538 for (i = first; i <= last; i++) {
3539 int old_was_color;
3540 struct vc_data *vc = vc_cons[i].d;
3541
3542 if (con_driver_map[i])
3543 module_put(con_driver_map[i]->owner);
3544 __module_get(owner);
3545 con_driver_map[i] = csw;
3546
3547 if (!vc || !vc->vc_sw)
3548 continue;
3549
3550 j = i;
3551
3552 if (con_is_visible(vc)) {
3553 k = i;
3554 save_screen(vc);
3555 }
3556
3557 old_was_color = vc->vc_can_do_color;
3558 vc->vc_sw->con_deinit(vc);
3559 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3560 visual_init(vc, i, 0);
3561 set_origin(vc);
3562 update_attr(vc);
3563
3564 /* If the console changed between mono <-> color, then
3565 * the attributes in the screenbuf will be wrong. The
3566 * following resets all attributes to something sane.
3567 */
3568 if (old_was_color != vc->vc_can_do_color)
3569 clear_buffer_attributes(vc);
3570 }
3571
3572 pr_info("Console: switching ");
3573 if (!deflt)
3574 pr_cont("consoles %d-%d ", first + 1, last + 1);
3575 if (j >= 0) {
3576 struct vc_data *vc = vc_cons[j].d;
3577
3578 pr_cont("to %s %s %dx%d\n",
3579 vc->vc_can_do_color ? "colour" : "mono",
3580 desc, vc->vc_cols, vc->vc_rows);
3581
3582 if (k >= 0) {
3583 vc = vc_cons[k].d;
3584 update_screen(vc);
3585 }
3586 } else {
3587 pr_cont("to %s\n", desc);
3588 }
3589
3590 retval = 0;
3591 err:
3592 module_put(owner);
3593 return retval;
3594 };
3595
3596
3597 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3598 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3599 {
3600 struct module *owner = csw->owner;
3601 const struct consw *defcsw = NULL;
3602 struct con_driver *con_driver = NULL, *con_back = NULL;
3603 int i, retval = -ENODEV;
3604
3605 if (!try_module_get(owner))
3606 return -ENODEV;
3607
3608 WARN_CONSOLE_UNLOCKED();
3609
3610 /* check if driver is registered and if it is unbindable */
3611 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3612 con_driver = &registered_con_driver[i];
3613
3614 if (con_driver->con == csw &&
3615 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3616 retval = 0;
3617 break;
3618 }
3619 }
3620
3621 if (retval)
3622 goto err;
3623
3624 retval = -ENODEV;
3625
3626 /* check if backup driver exists */
3627 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3628 con_back = &registered_con_driver[i];
3629
3630 if (con_back->con && con_back->con != csw) {
3631 defcsw = con_back->con;
3632 retval = 0;
3633 break;
3634 }
3635 }
3636
3637 if (retval)
3638 goto err;
3639
3640 if (!con_is_bound(csw))
3641 goto err;
3642
3643 first = max(first, con_driver->first);
3644 last = min(last, con_driver->last);
3645
3646 for (i = first; i <= last; i++) {
3647 if (con_driver_map[i] == csw) {
3648 module_put(csw->owner);
3649 con_driver_map[i] = NULL;
3650 }
3651 }
3652
3653 if (!con_is_bound(defcsw)) {
3654 const struct consw *defconsw = conswitchp;
3655
3656 defcsw->con_startup();
3657 con_back->flag |= CON_DRIVER_FLAG_INIT;
3658 /*
3659 * vgacon may change the default driver to point
3660 * to dummycon, we restore it here...
3661 */
3662 conswitchp = defconsw;
3663 }
3664
3665 if (!con_is_bound(csw))
3666 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3667
3668 /* ignore return value, binding should not fail */
3669 do_bind_con_driver(defcsw, first, last, deflt);
3670 err:
3671 module_put(owner);
3672 return retval;
3673
3674 }
3675 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3676
3677 static int vt_bind(struct con_driver *con)
3678 {
3679 const struct consw *defcsw = NULL, *csw = NULL;
3680 int i, more = 1, first = -1, last = -1, deflt = 0;
3681
3682 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3683 goto err;
3684
3685 csw = con->con;
3686
3687 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3688 struct con_driver *con = &registered_con_driver[i];
3689
3690 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3691 defcsw = con->con;
3692 break;
3693 }
3694 }
3695
3696 if (!defcsw)
3697 goto err;
3698
3699 while (more) {
3700 more = 0;
3701
3702 for (i = con->first; i <= con->last; i++) {
3703 if (con_driver_map[i] == defcsw) {
3704 if (first == -1)
3705 first = i;
3706 last = i;
3707 more = 1;
3708 } else if (first != -1)
3709 break;
3710 }
3711
3712 if (first == 0 && last == MAX_NR_CONSOLES -1)
3713 deflt = 1;
3714
3715 if (first != -1)
3716 do_bind_con_driver(csw, first, last, deflt);
3717
3718 first = -1;
3719 last = -1;
3720 deflt = 0;
3721 }
3722
3723 err:
3724 return 0;
3725 }
3726
3727 static int vt_unbind(struct con_driver *con)
3728 {
3729 const struct consw *csw = NULL;
3730 int i, more = 1, first = -1, last = -1, deflt = 0;
3731 int ret;
3732
3733 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3734 goto err;
3735
3736 csw = con->con;
3737
3738 while (more) {
3739 more = 0;
3740
3741 for (i = con->first; i <= con->last; i++) {
3742 if (con_driver_map[i] == csw) {
3743 if (first == -1)
3744 first = i;
3745 last = i;
3746 more = 1;
3747 } else if (first != -1)
3748 break;
3749 }
3750
3751 if (first == 0 && last == MAX_NR_CONSOLES -1)
3752 deflt = 1;
3753
3754 if (first != -1) {
3755 ret = do_unbind_con_driver(csw, first, last, deflt);
3756 if (ret != 0)
3757 return ret;
3758 }
3759
3760 first = -1;
3761 last = -1;
3762 deflt = 0;
3763 }
3764
3765 err:
3766 return 0;
3767 }
3768 #else
3769 static inline int vt_bind(struct con_driver *con)
3770 {
3771 return 0;
3772 }
3773 static inline int vt_unbind(struct con_driver *con)
3774 {
3775 return 0;
3776 }
3777 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3778
3779 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3780 const char *buf, size_t count)
3781 {
3782 struct con_driver *con = dev_get_drvdata(dev);
3783 int bind = simple_strtoul(buf, NULL, 0);
3784
3785 console_lock();
3786
3787 if (bind)
3788 vt_bind(con);
3789 else
3790 vt_unbind(con);
3791
3792 console_unlock();
3793
3794 return count;
3795 }
3796
3797 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3798 char *buf)
3799 {
3800 struct con_driver *con = dev_get_drvdata(dev);
3801 int bind;
3802
3803 console_lock();
3804 bind = con_is_bound(con->con);
3805 console_unlock();
3806
3807 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3808 }
3809
3810 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3811 char *buf)
3812 {
3813 struct con_driver *con = dev_get_drvdata(dev);
3814
3815 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3816 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3817 con->desc);
3818
3819 }
3820
3821 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3822 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3823
3824 static struct attribute *con_dev_attrs[] = {
3825 &dev_attr_bind.attr,
3826 &dev_attr_name.attr,
3827 NULL
3828 };
3829
3830 ATTRIBUTE_GROUPS(con_dev);
3831
3832 static int vtconsole_init_device(struct con_driver *con)
3833 {
3834 con->flag |= CON_DRIVER_FLAG_ATTR;
3835 return 0;
3836 }
3837
3838 static void vtconsole_deinit_device(struct con_driver *con)
3839 {
3840 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3841 }
3842
3843 /**
3844 * con_is_bound - checks if driver is bound to the console
3845 * @csw: console driver
3846 *
3847 * RETURNS: zero if unbound, nonzero if bound
3848 *
3849 * Drivers can call this and if zero, they should release
3850 * all resources allocated on con_startup()
3851 */
3852 int con_is_bound(const struct consw *csw)
3853 {
3854 int i, bound = 0;
3855
3856 WARN_CONSOLE_UNLOCKED();
3857
3858 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3859 if (con_driver_map[i] == csw) {
3860 bound = 1;
3861 break;
3862 }
3863 }
3864
3865 return bound;
3866 }
3867 EXPORT_SYMBOL(con_is_bound);
3868
3869 /**
3870 * con_is_visible - checks whether the current console is visible
3871 * @vc: virtual console
3872 *
3873 * RETURNS: zero if not visible, nonzero if visible
3874 */
3875 bool con_is_visible(const struct vc_data *vc)
3876 {
3877 WARN_CONSOLE_UNLOCKED();
3878
3879 return *vc->vc_display_fg == vc;
3880 }
3881 EXPORT_SYMBOL(con_is_visible);
3882
3883 /**
3884 * con_debug_enter - prepare the console for the kernel debugger
3885 * @sw: console driver
3886 *
3887 * Called when the console is taken over by the kernel debugger, this
3888 * function needs to save the current console state, then put the console
3889 * into a state suitable for the kernel debugger.
3890 *
3891 * RETURNS:
3892 * Zero on success, nonzero if a failure occurred when trying to prepare
3893 * the console for the debugger.
3894 */
3895 int con_debug_enter(struct vc_data *vc)
3896 {
3897 int ret = 0;
3898
3899 saved_fg_console = fg_console;
3900 saved_last_console = last_console;
3901 saved_want_console = want_console;
3902 saved_vc_mode = vc->vc_mode;
3903 saved_console_blanked = console_blanked;
3904 vc->vc_mode = KD_TEXT;
3905 console_blanked = 0;
3906 if (vc->vc_sw->con_debug_enter)
3907 ret = vc->vc_sw->con_debug_enter(vc);
3908 #ifdef CONFIG_KGDB_KDB
3909 /* Set the initial LINES variable if it is not already set */
3910 if (vc->vc_rows < 999) {
3911 int linecount;
3912 char lns[4];
3913 const char *setargs[3] = {
3914 "set",
3915 "LINES",
3916 lns,
3917 };
3918 if (kdbgetintenv(setargs[0], &linecount)) {
3919 snprintf(lns, 4, "%i", vc->vc_rows);
3920 kdb_set(2, setargs);
3921 }
3922 }
3923 if (vc->vc_cols < 999) {
3924 int colcount;
3925 char cols[4];
3926 const char *setargs[3] = {
3927 "set",
3928 "COLUMNS",
3929 cols,
3930 };
3931 if (kdbgetintenv(setargs[0], &colcount)) {
3932 snprintf(cols, 4, "%i", vc->vc_cols);
3933 kdb_set(2, setargs);
3934 }
3935 }
3936 #endif /* CONFIG_KGDB_KDB */
3937 return ret;
3938 }
3939 EXPORT_SYMBOL_GPL(con_debug_enter);
3940
3941 /**
3942 * con_debug_leave - restore console state
3943 * @sw: console driver
3944 *
3945 * Restore the console state to what it was before the kernel debugger
3946 * was invoked.
3947 *
3948 * RETURNS:
3949 * Zero on success, nonzero if a failure occurred when trying to restore
3950 * the console.
3951 */
3952 int con_debug_leave(void)
3953 {
3954 struct vc_data *vc;
3955 int ret = 0;
3956
3957 fg_console = saved_fg_console;
3958 last_console = saved_last_console;
3959 want_console = saved_want_console;
3960 console_blanked = saved_console_blanked;
3961 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3962
3963 vc = vc_cons[fg_console].d;
3964 if (vc->vc_sw->con_debug_leave)
3965 ret = vc->vc_sw->con_debug_leave(vc);
3966 return ret;
3967 }
3968 EXPORT_SYMBOL_GPL(con_debug_leave);
3969
3970 static int do_register_con_driver(const struct consw *csw, int first, int last)
3971 {
3972 struct module *owner = csw->owner;
3973 struct con_driver *con_driver;
3974 const char *desc;
3975 int i, retval;
3976
3977 WARN_CONSOLE_UNLOCKED();
3978
3979 if (!try_module_get(owner))
3980 return -ENODEV;
3981
3982 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3983 con_driver = &registered_con_driver[i];
3984
3985 /* already registered */
3986 if (con_driver->con == csw) {
3987 retval = -EBUSY;
3988 goto err;
3989 }
3990 }
3991
3992 desc = csw->con_startup();
3993 if (!desc) {
3994 retval = -ENODEV;
3995 goto err;
3996 }
3997
3998 retval = -EINVAL;
3999
4000 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4001 con_driver = &registered_con_driver[i];
4002
4003 if (con_driver->con == NULL &&
4004 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4005 con_driver->con = csw;
4006 con_driver->desc = desc;
4007 con_driver->node = i;
4008 con_driver->flag = CON_DRIVER_FLAG_MODULE |
4009 CON_DRIVER_FLAG_INIT;
4010 con_driver->first = first;
4011 con_driver->last = last;
4012 retval = 0;
4013 break;
4014 }
4015 }
4016
4017 if (retval)
4018 goto err;
4019
4020 con_driver->dev =
4021 device_create_with_groups(vtconsole_class, NULL,
4022 MKDEV(0, con_driver->node),
4023 con_driver, con_dev_groups,
4024 "vtcon%i", con_driver->node);
4025 if (IS_ERR(con_driver->dev)) {
4026 pr_warn("Unable to create device for %s; errno = %ld\n",
4027 con_driver->desc, PTR_ERR(con_driver->dev));
4028 con_driver->dev = NULL;
4029 } else {
4030 vtconsole_init_device(con_driver);
4031 }
4032
4033 err:
4034 module_put(owner);
4035 return retval;
4036 }
4037
4038
4039 /**
4040 * do_unregister_con_driver - unregister console driver from console layer
4041 * @csw: console driver
4042 *
4043 * DESCRIPTION: All drivers that registers to the console layer must
4044 * call this function upon exit, or if the console driver is in a state
4045 * where it won't be able to handle console services, such as the
4046 * framebuffer console without loaded framebuffer drivers.
4047 *
4048 * The driver must unbind first prior to unregistration.
4049 */
4050 int do_unregister_con_driver(const struct consw *csw)
4051 {
4052 int i;
4053
4054 /* cannot unregister a bound driver */
4055 if (con_is_bound(csw))
4056 return -EBUSY;
4057
4058 if (csw == conswitchp)
4059 return -EINVAL;
4060
4061 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4062 struct con_driver *con_driver = &registered_con_driver[i];
4063
4064 if (con_driver->con == csw) {
4065 /*
4066 * Defer the removal of the sysfs entries since that
4067 * will acquire the kernfs s_active lock and we can't
4068 * acquire this lock while holding the console lock:
4069 * the unbind sysfs entry imposes already the opposite
4070 * order. Reset con already here to prevent any later
4071 * lookup to succeed and mark this slot as zombie, so
4072 * it won't get reused until we complete the removal
4073 * in the deferred work.
4074 */
4075 con_driver->con = NULL;
4076 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4077 schedule_work(&con_driver_unregister_work);
4078
4079 return 0;
4080 }
4081 }
4082
4083 return -ENODEV;
4084 }
4085 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4086
4087 static void con_driver_unregister_callback(struct work_struct *ignored)
4088 {
4089 int i;
4090
4091 console_lock();
4092
4093 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4094 struct con_driver *con_driver = &registered_con_driver[i];
4095
4096 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4097 continue;
4098
4099 console_unlock();
4100
4101 vtconsole_deinit_device(con_driver);
4102 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4103
4104 console_lock();
4105
4106 if (WARN_ON_ONCE(con_driver->con))
4107 con_driver->con = NULL;
4108 con_driver->desc = NULL;
4109 con_driver->dev = NULL;
4110 con_driver->node = 0;
4111 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4112 con_driver->flag = 0;
4113 con_driver->first = 0;
4114 con_driver->last = 0;
4115 }
4116
4117 console_unlock();
4118 }
4119
4120 /*
4121 * If we support more console drivers, this function is used
4122 * when a driver wants to take over some existing consoles
4123 * and become default driver for newly opened ones.
4124 *
4125 * do_take_over_console is basically a register followed by bind
4126 */
4127 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4128 {
4129 int err;
4130
4131 err = do_register_con_driver(csw, first, last);
4132 /*
4133 * If we get an busy error we still want to bind the console driver
4134 * and return success, as we may have unbound the console driver
4135 * but not unregistered it.
4136 */
4137 if (err == -EBUSY)
4138 err = 0;
4139 if (!err)
4140 do_bind_con_driver(csw, first, last, deflt);
4141
4142 return err;
4143 }
4144 EXPORT_SYMBOL_GPL(do_take_over_console);
4145
4146
4147 /*
4148 * give_up_console is a wrapper to unregister_con_driver. It will only
4149 * work if driver is fully unbound.
4150 */
4151 void give_up_console(const struct consw *csw)
4152 {
4153 console_lock();
4154 do_unregister_con_driver(csw);
4155 console_unlock();
4156 }
4157
4158 static int __init vtconsole_class_init(void)
4159 {
4160 int i;
4161
4162 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4163 if (IS_ERR(vtconsole_class)) {
4164 pr_warn("Unable to create vt console class; errno = %ld\n",
4165 PTR_ERR(vtconsole_class));
4166 vtconsole_class = NULL;
4167 }
4168
4169 /* Add system drivers to sysfs */
4170 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4171 struct con_driver *con = &registered_con_driver[i];
4172
4173 if (con->con && !con->dev) {
4174 con->dev =
4175 device_create_with_groups(vtconsole_class, NULL,
4176 MKDEV(0, con->node),
4177 con, con_dev_groups,
4178 "vtcon%i", con->node);
4179
4180 if (IS_ERR(con->dev)) {
4181 pr_warn("Unable to create device for %s; errno = %ld\n",
4182 con->desc, PTR_ERR(con->dev));
4183 con->dev = NULL;
4184 } else {
4185 vtconsole_init_device(con);
4186 }
4187 }
4188 }
4189
4190 return 0;
4191 }
4192 postcore_initcall(vtconsole_class_init);
4193
4194 #endif
4195
4196 /*
4197 * Screen blanking
4198 */
4199
4200 static int set_vesa_blanking(char __user *p)
4201 {
4202 unsigned int mode;
4203
4204 if (get_user(mode, p + 1))
4205 return -EFAULT;
4206
4207 vesa_blank_mode = (mode < 4) ? mode : 0;
4208 return 0;
4209 }
4210
4211 void do_blank_screen(int entering_gfx)
4212 {
4213 struct vc_data *vc = vc_cons[fg_console].d;
4214 int i;
4215
4216 might_sleep();
4217
4218 WARN_CONSOLE_UNLOCKED();
4219
4220 if (console_blanked) {
4221 if (blank_state == blank_vesa_wait) {
4222 blank_state = blank_off;
4223 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4224 }
4225 return;
4226 }
4227
4228 /* entering graphics mode? */
4229 if (entering_gfx) {
4230 hide_cursor(vc);
4231 save_screen(vc);
4232 vc->vc_sw->con_blank(vc, -1, 1);
4233 console_blanked = fg_console + 1;
4234 blank_state = blank_off;
4235 set_origin(vc);
4236 return;
4237 }
4238
4239 blank_state = blank_off;
4240
4241 /* don't blank graphics */
4242 if (vc->vc_mode != KD_TEXT) {
4243 console_blanked = fg_console + 1;
4244 return;
4245 }
4246
4247 hide_cursor(vc);
4248 del_timer_sync(&console_timer);
4249 blank_timer_expired = 0;
4250
4251 save_screen(vc);
4252 /* In case we need to reset origin, blanking hook returns 1 */
4253 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4254 console_blanked = fg_console + 1;
4255 if (i)
4256 set_origin(vc);
4257
4258 if (console_blank_hook && console_blank_hook(1))
4259 return;
4260
4261 if (vesa_off_interval && vesa_blank_mode) {
4262 blank_state = blank_vesa_wait;
4263 mod_timer(&console_timer, jiffies + vesa_off_interval);
4264 }
4265 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4266 }
4267 EXPORT_SYMBOL(do_blank_screen);
4268
4269 /*
4270 * Called by timer as well as from vt_console_driver
4271 */
4272 void do_unblank_screen(int leaving_gfx)
4273 {
4274 struct vc_data *vc;
4275
4276 /* This should now always be called from a "sane" (read: can schedule)
4277 * context for the sake of the low level drivers, except in the special
4278 * case of oops_in_progress
4279 */
4280 if (!oops_in_progress)
4281 might_sleep();
4282
4283 WARN_CONSOLE_UNLOCKED();
4284
4285 ignore_poke = 0;
4286 if (!console_blanked)
4287 return;
4288 if (!vc_cons_allocated(fg_console)) {
4289 /* impossible */
4290 pr_warn("unblank_screen: tty %d not allocated ??\n",
4291 fg_console + 1);
4292 return;
4293 }
4294 vc = vc_cons[fg_console].d;
4295 if (vc->vc_mode != KD_TEXT)
4296 return; /* but leave console_blanked != 0 */
4297
4298 if (blankinterval) {
4299 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4300 blank_state = blank_normal_wait;
4301 }
4302
4303 console_blanked = 0;
4304 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4305 /* Low-level driver cannot restore -> do it ourselves */
4306 update_screen(vc);
4307 if (console_blank_hook)
4308 console_blank_hook(0);
4309 set_palette(vc);
4310 set_cursor(vc);
4311 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4312 }
4313 EXPORT_SYMBOL(do_unblank_screen);
4314
4315 /*
4316 * This is called by the outside world to cause a forced unblank, mostly for
4317 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4318 * call it with 1 as an argument and so force a mode restore... that may kill
4319 * X or at least garbage the screen but would also make the Oops visible...
4320 */
4321 void unblank_screen(void)
4322 {
4323 do_unblank_screen(0);
4324 }
4325
4326 /*
4327 * We defer the timer blanking to work queue so it can take the console mutex
4328 * (console operations can still happen at irq time, but only from printk which
4329 * has the console mutex. Not perfect yet, but better than no locking
4330 */
4331 static void blank_screen_t(struct timer_list *unused)
4332 {
4333 blank_timer_expired = 1;
4334 schedule_work(&console_work);
4335 }
4336
4337 void poke_blanked_console(void)
4338 {
4339 WARN_CONSOLE_UNLOCKED();
4340
4341 /* Add this so we quickly catch whoever might call us in a non
4342 * safe context. Nowadays, unblank_screen() isn't to be called in
4343 * atomic contexts and is allowed to schedule (with the special case
4344 * of oops_in_progress, but that isn't of any concern for this
4345 * function. --BenH.
4346 */
4347 might_sleep();
4348
4349 /* This isn't perfectly race free, but a race here would be mostly harmless,
4350 * at worse, we'll do a spurrious blank and it's unlikely
4351 */
4352 del_timer(&console_timer);
4353 blank_timer_expired = 0;
4354
4355 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4356 return;
4357 if (console_blanked)
4358 unblank_screen();
4359 else if (blankinterval) {
4360 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4361 blank_state = blank_normal_wait;
4362 }
4363 }
4364
4365 /*
4366 * Palettes
4367 */
4368
4369 static void set_palette(struct vc_data *vc)
4370 {
4371 WARN_CONSOLE_UNLOCKED();
4372
4373 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4374 vc->vc_sw->con_set_palette(vc, color_table);
4375 }
4376
4377 /*
4378 * Load palette into the DAC registers. arg points to a colour
4379 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4380 */
4381
4382 int con_set_cmap(unsigned char __user *arg)
4383 {
4384 int i, j, k;
4385 unsigned char colormap[3*16];
4386
4387 if (copy_from_user(colormap, arg, sizeof(colormap)))
4388 return -EFAULT;
4389
4390 console_lock();
4391 for (i = k = 0; i < 16; i++) {
4392 default_red[i] = colormap[k++];
4393 default_grn[i] = colormap[k++];
4394 default_blu[i] = colormap[k++];
4395 }
4396 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4397 if (!vc_cons_allocated(i))
4398 continue;
4399 for (j = k = 0; j < 16; j++) {
4400 vc_cons[i].d->vc_palette[k++] = default_red[j];
4401 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4402 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4403 }
4404 set_palette(vc_cons[i].d);
4405 }
4406 console_unlock();
4407
4408 return 0;
4409 }
4410
4411 int con_get_cmap(unsigned char __user *arg)
4412 {
4413 int i, k;
4414 unsigned char colormap[3*16];
4415
4416 console_lock();
4417 for (i = k = 0; i < 16; i++) {
4418 colormap[k++] = default_red[i];
4419 colormap[k++] = default_grn[i];
4420 colormap[k++] = default_blu[i];
4421 }
4422 console_unlock();
4423
4424 if (copy_to_user(arg, colormap, sizeof(colormap)))
4425 return -EFAULT;
4426
4427 return 0;
4428 }
4429
4430 void reset_palette(struct vc_data *vc)
4431 {
4432 int j, k;
4433 for (j=k=0; j<16; j++) {
4434 vc->vc_palette[k++] = default_red[j];
4435 vc->vc_palette[k++] = default_grn[j];
4436 vc->vc_palette[k++] = default_blu[j];
4437 }
4438 set_palette(vc);
4439 }
4440
4441 /*
4442 * Font switching
4443 *
4444 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4445 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4446 * depending on width) reserved for each character which is kinda wasty, but
4447 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4448 * is up to the actual low-level console-driver convert data into its favorite
4449 * format (maybe we should add a `fontoffset' field to the `display'
4450 * structure so we won't have to convert the fontdata all the time.
4451 * /Jes
4452 */
4453
4454 #define max_font_size 65536
4455
4456 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4457 {
4458 struct console_font font;
4459 int rc = -EINVAL;
4460 int c;
4461
4462 if (op->data) {
4463 font.data = kmalloc(max_font_size, GFP_KERNEL);
4464 if (!font.data)
4465 return -ENOMEM;
4466 } else
4467 font.data = NULL;
4468
4469 console_lock();
4470 if (vc->vc_mode != KD_TEXT)
4471 rc = -EINVAL;
4472 else if (vc->vc_sw->con_font_get)
4473 rc = vc->vc_sw->con_font_get(vc, &font);
4474 else
4475 rc = -ENOSYS;
4476 console_unlock();
4477
4478 if (rc)
4479 goto out;
4480
4481 c = (font.width+7)/8 * 32 * font.charcount;
4482
4483 if (op->data && font.charcount > op->charcount)
4484 rc = -ENOSPC;
4485 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4486 if (font.width > op->width || font.height > op->height)
4487 rc = -ENOSPC;
4488 } else {
4489 if (font.width != 8)
4490 rc = -EIO;
4491 else if ((op->height && font.height > op->height) ||
4492 font.height > 32)
4493 rc = -ENOSPC;
4494 }
4495 if (rc)
4496 goto out;
4497
4498 op->height = font.height;
4499 op->width = font.width;
4500 op->charcount = font.charcount;
4501
4502 if (op->data && copy_to_user(op->data, font.data, c))
4503 rc = -EFAULT;
4504
4505 out:
4506 kfree(font.data);
4507 return rc;
4508 }
4509
4510 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4511 {
4512 struct console_font font;
4513 int rc = -EINVAL;
4514 int size;
4515
4516 if (vc->vc_mode != KD_TEXT)
4517 return -EINVAL;
4518 if (!op->data)
4519 return -EINVAL;
4520 if (op->charcount > 512)
4521 return -EINVAL;
4522 if (op->width <= 0 || op->width > 32 || op->height > 32)
4523 return -EINVAL;
4524 size = (op->width+7)/8 * 32 * op->charcount;
4525 if (size > max_font_size)
4526 return -ENOSPC;
4527
4528 font.data = memdup_user(op->data, size);
4529 if (IS_ERR(font.data))
4530 return PTR_ERR(font.data);
4531
4532 if (!op->height) { /* Need to guess font height [compat] */
4533 int h, i;
4534 u8 *charmap = font.data;
4535
4536 /*
4537 * If from KDFONTOP ioctl, don't allow things which can be done
4538 * in userland,so that we can get rid of this soon
4539 */
4540 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4541 kfree(font.data);
4542 return -EINVAL;
4543 }
4544
4545 for (h = 32; h > 0; h--)
4546 for (i = 0; i < op->charcount; i++)
4547 if (charmap[32*i+h-1])
4548 goto nonzero;
4549
4550 kfree(font.data);
4551 return -EINVAL;
4552
4553 nonzero:
4554 op->height = h;
4555 }
4556
4557 font.charcount = op->charcount;
4558 font.width = op->width;
4559 font.height = op->height;
4560
4561 console_lock();
4562 if (vc->vc_mode != KD_TEXT)
4563 rc = -EINVAL;
4564 else if (vc->vc_sw->con_font_set)
4565 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4566 else
4567 rc = -ENOSYS;
4568 console_unlock();
4569 kfree(font.data);
4570 return rc;
4571 }
4572
4573 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4574 {
4575 struct console_font font = {.width = op->width, .height = op->height};
4576 char name[MAX_FONT_NAME];
4577 char *s = name;
4578 int rc;
4579
4580
4581 if (!op->data)
4582 s = NULL;
4583 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4584 return -EFAULT;
4585 else
4586 name[MAX_FONT_NAME - 1] = 0;
4587
4588 console_lock();
4589 if (vc->vc_mode != KD_TEXT) {
4590 console_unlock();
4591 return -EINVAL;
4592 }
4593 if (vc->vc_sw->con_font_default)
4594 rc = vc->vc_sw->con_font_default(vc, &font, s);
4595 else
4596 rc = -ENOSYS;
4597 console_unlock();
4598 if (!rc) {
4599 op->width = font.width;
4600 op->height = font.height;
4601 }
4602 return rc;
4603 }
4604
4605 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4606 {
4607 int con = op->height;
4608 int rc;
4609
4610
4611 console_lock();
4612 if (vc->vc_mode != KD_TEXT)
4613 rc = -EINVAL;
4614 else if (!vc->vc_sw->con_font_copy)
4615 rc = -ENOSYS;
4616 else if (con < 0 || !vc_cons_allocated(con))
4617 rc = -ENOTTY;
4618 else if (con == vc->vc_num) /* nothing to do */
4619 rc = 0;
4620 else
4621 rc = vc->vc_sw->con_font_copy(vc, con);
4622 console_unlock();
4623 return rc;
4624 }
4625
4626 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4627 {
4628 switch (op->op) {
4629 case KD_FONT_OP_SET:
4630 return con_font_set(vc, op);
4631 case KD_FONT_OP_GET:
4632 return con_font_get(vc, op);
4633 case KD_FONT_OP_SET_DEFAULT:
4634 return con_font_default(vc, op);
4635 case KD_FONT_OP_COPY:
4636 return con_font_copy(vc, op);
4637 }
4638 return -ENOSYS;
4639 }
4640
4641 /*
4642 * Interface exported to selection and vcs.
4643 */
4644
4645 /* used by selection */
4646 u16 screen_glyph(struct vc_data *vc, int offset)
4647 {
4648 u16 w = scr_readw(screenpos(vc, offset, 1));
4649 u16 c = w & 0xff;
4650
4651 if (w & vc->vc_hi_font_mask)
4652 c |= 0x100;
4653 return c;
4654 }
4655 EXPORT_SYMBOL_GPL(screen_glyph);
4656
4657 u32 screen_glyph_unicode(struct vc_data *vc, int n)
4658 {
4659 struct uni_screen *uniscr = get_vc_uniscr(vc);
4660
4661 if (uniscr)
4662 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4663 return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4664 }
4665 EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4666
4667 /* used by vcs - note the word offset */
4668 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4669 {
4670 return screenpos(vc, 2 * w_offset, viewed);
4671 }
4672 EXPORT_SYMBOL_GPL(screen_pos);
4673
4674 void getconsxy(struct vc_data *vc, unsigned char *p)
4675 {
4676 /* clamp values if they don't fit */
4677 p[0] = min(vc->vc_x, 0xFFu);
4678 p[1] = min(vc->vc_y, 0xFFu);
4679 }
4680
4681 void putconsxy(struct vc_data *vc, unsigned char *p)
4682 {
4683 hide_cursor(vc);
4684 gotoxy(vc, p[0], p[1]);
4685 set_cursor(vc);
4686 }
4687
4688 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4689 {
4690 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4691 return softcursor_original;
4692 return scr_readw(org);
4693 }
4694
4695 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4696 {
4697 scr_writew(val, org);
4698 if ((unsigned long)org == vc->vc_pos) {
4699 softcursor_original = -1;
4700 add_softcursor(vc);
4701 }
4702 }
4703
4704 void vcs_scr_updated(struct vc_data *vc)
4705 {
4706 notify_update(vc);
4707 }
4708
4709 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4710 unsigned int rolled_over, void *base, unsigned int size)
4711 {
4712 unsigned long ubase = (unsigned long)base;
4713 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4714 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4715 ptrdiff_t origin = (void *)c->vc_origin - base;
4716 int margin = c->vc_size_row * 4;
4717 int from, wrap, from_off, avail;
4718
4719 /* Turn scrollback off */
4720 if (!lines) {
4721 c->vc_visible_origin = c->vc_origin;
4722 return;
4723 }
4724
4725 /* Do we have already enough to allow jumping from 0 to the end? */
4726 if (rolled_over > scr_end + margin) {
4727 from = scr_end;
4728 wrap = rolled_over + c->vc_size_row;
4729 } else {
4730 from = 0;
4731 wrap = size;
4732 }
4733
4734 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4735 avail = (origin - from + wrap) % wrap;
4736
4737 /* Only a little piece would be left? Show all incl. the piece! */
4738 if (avail < 2 * margin)
4739 margin = 0;
4740 if (from_off < margin)
4741 from_off = 0;
4742 if (from_off > avail - margin)
4743 from_off = avail;
4744
4745 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4746 }
4747 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4748
4749 /*
4750 * Visible symbols for modules
4751 */
4752
4753 EXPORT_SYMBOL(color_table);
4754 EXPORT_SYMBOL(default_red);
4755 EXPORT_SYMBOL(default_grn);
4756 EXPORT_SYMBOL(default_blu);
4757 EXPORT_SYMBOL(update_region);
4758 EXPORT_SYMBOL(redraw_screen);
4759 EXPORT_SYMBOL(vc_resize);
4760 EXPORT_SYMBOL(fg_console);
4761 EXPORT_SYMBOL(console_blank_hook);
4762 EXPORT_SYMBOL(console_blanked);
4763 EXPORT_SYMBOL(vc_cons);
4764 EXPORT_SYMBOL(global_cursor_default);
4765 #ifndef VT_SINGLE_DRIVER
4766 EXPORT_SYMBOL(give_up_console);
4767 #endif
Linux with added FPC-III support