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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6/*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
61 * deletion SMP-safe. 17Jun00, Andrew Morton
62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72 */
73
74#include <linux/module.h>
75#include <linux/types.h>
76#include <linux/sched/signal.h>
77#include <linux/tty.h>
78#include <linux/tty_flip.h>
79#include <linux/kernel.h>
80#include <linux/string.h>
81#include <linux/errno.h>
82#include <linux/kd.h>
83#include <linux/slab.h>
84#include <linux/vmalloc.h>
85#include <linux/major.h>
86#include <linux/mm.h>
87#include <linux/console.h>
88#include <linux/init.h>
89#include <linux/mutex.h>
90#include <linux/vt_kern.h>
91#include <linux/selection.h>
92#include <linux/tiocl.h>
93#include <linux/kbd_kern.h>
94#include <linux/consolemap.h>
95#include <linux/timer.h>
96#include <linux/interrupt.h>
97#include <linux/workqueue.h>
98#include <linux/pm.h>
99#include <linux/font.h>
100#include <linux/bitops.h>
101#include <linux/notifier.h>
102#include <linux/device.h>
103#include <linux/io.h>
104#include <linux/uaccess.h>
105#include <linux/kdb.h>
106#include <linux/ctype.h>
107#include <linux/bsearch.h>
108#include <linux/gcd.h>
109
110#define MAX_NR_CON_DRIVER 16
111
112#define CON_DRIVER_FLAG_MODULE 1
113#define CON_DRIVER_FLAG_INIT 2
114#define CON_DRIVER_FLAG_ATTR 4
115#define CON_DRIVER_FLAG_ZOMBIE 8
116
117struct con_driver {
118 const struct consw *con;
119 const char *desc;
120 struct device *dev;
121 int node;
122 int first;
123 int last;
124 int flag;
125};
126
127static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
128const struct consw *conswitchp;
129
130/*
131 * Here is the default bell parameters: 750HZ, 1/8th of a second
132 */
133#define DEFAULT_BELL_PITCH 750
134#define DEFAULT_BELL_DURATION (HZ/8)
135#define DEFAULT_CURSOR_BLINK_MS 200
136
137struct vc vc_cons [MAX_NR_CONSOLES];
138
139#ifndef VT_SINGLE_DRIVER
140static const struct consw *con_driver_map[MAX_NR_CONSOLES];
141#endif
142
143static int con_open(struct tty_struct *, struct file *);
144static void vc_init(struct vc_data *vc, unsigned int rows,
145 unsigned int cols, int do_clear);
146static void gotoxy(struct vc_data *vc, int new_x, int new_y);
147static void save_cur(struct vc_data *vc);
148static void reset_terminal(struct vc_data *vc, int do_clear);
149static void con_flush_chars(struct tty_struct *tty);
150static int set_vesa_blanking(char __user *p);
151static void set_cursor(struct vc_data *vc);
152static void hide_cursor(struct vc_data *vc);
153static void console_callback(struct work_struct *ignored);
154static void con_driver_unregister_callback(struct work_struct *ignored);
155static void blank_screen_t(struct timer_list *unused);
156static void set_palette(struct vc_data *vc);
157
158#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
159
160static int printable; /* Is console ready for printing? */
161int default_utf8 = true;
162module_param(default_utf8, int, S_IRUGO | S_IWUSR);
163int global_cursor_default = -1;
164module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
165
166static int cur_default = CUR_UNDERLINE;
167module_param(cur_default, int, S_IRUGO | S_IWUSR);
168
169/*
170 * ignore_poke: don't unblank the screen when things are typed. This is
171 * mainly for the privacy of braille terminal users.
172 */
173static int ignore_poke;
174
175int do_poke_blanked_console;
176int console_blanked;
177
178static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
179static int vesa_off_interval;
180static int blankinterval;
181core_param(consoleblank, blankinterval, int, 0444);
182
183static DECLARE_WORK(console_work, console_callback);
184static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
185
186/*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
190 * saved_* variants are for save/restore around kernel debugger enter/leave
191 */
192int fg_console;
193int last_console;
194int want_console = -1;
195static int saved_fg_console;
196static int saved_last_console;
197static int saved_want_console;
198static int saved_vc_mode;
199static int saved_console_blanked;
200
201/*
202 * For each existing display, we have a pointer to console currently visible
203 * on that display, allowing consoles other than fg_console to be refreshed
204 * appropriately. Unless the low-level driver supplies its own display_fg
205 * variable, we use this one for the "master display".
206 */
207static struct vc_data *master_display_fg;
208
209/*
210 * Unfortunately, we need to delay tty echo when we're currently writing to the
211 * console since the code is (and always was) not re-entrant, so we schedule
212 * all flip requests to process context with schedule-task() and run it from
213 * console_callback().
214 */
215
216/*
217 * For the same reason, we defer scrollback to the console callback.
218 */
219static int scrollback_delta;
220
221/*
222 * Hook so that the power management routines can (un)blank
223 * the console on our behalf.
224 */
225int (*console_blank_hook)(int);
226
227static DEFINE_TIMER(console_timer, blank_screen_t);
228static int blank_state;
229static int blank_timer_expired;
230enum {
231 blank_off = 0,
232 blank_normal_wait,
233 blank_vesa_wait,
234};
235
236/*
237 * /sys/class/tty/tty0/
238 *
239 * the attribute 'active' contains the name of the current vc
240 * console and it supports poll() to detect vc switches
241 */
242static struct device *tty0dev;
243
244/*
245 * Notifier list for console events.
246 */
247static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
248
249int register_vt_notifier(struct notifier_block *nb)
250{
251 return atomic_notifier_chain_register(&vt_notifier_list, nb);
252}
253EXPORT_SYMBOL_GPL(register_vt_notifier);
254
255int unregister_vt_notifier(struct notifier_block *nb)
256{
257 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
258}
259EXPORT_SYMBOL_GPL(unregister_vt_notifier);
260
261static void notify_write(struct vc_data *vc, unsigned int unicode)
262{
263 struct vt_notifier_param param = { .vc = vc, .c = unicode };
264 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
265}
266
267static void notify_update(struct vc_data *vc)
268{
269 struct vt_notifier_param param = { .vc = vc };
270 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
271}
272/*
273 * Low-Level Functions
274 */
275
276static inline bool con_is_fg(const struct vc_data *vc)
277{
278 return vc->vc_num == fg_console;
279}
280
281static inline bool con_should_update(const struct vc_data *vc)
282{
283 return con_is_visible(vc) && !console_blanked;
284}
285
286static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
287{
288 unsigned short *p;
289
290 if (!viewed)
291 p = (unsigned short *)(vc->vc_origin + offset);
292 else if (!vc->vc_sw->con_screen_pos)
293 p = (unsigned short *)(vc->vc_visible_origin + offset);
294 else
295 p = vc->vc_sw->con_screen_pos(vc, offset);
296 return p;
297}
298
299/* Called from the keyboard irq path.. */
300static inline void scrolldelta(int lines)
301{
302 /* FIXME */
303 /* scrolldelta needs some kind of consistency lock, but the BKL was
304 and still is not protecting versus the scheduled back end */
305 scrollback_delta += lines;
306 schedule_console_callback();
307}
308
309void schedule_console_callback(void)
310{
311 schedule_work(&console_work);
312}
313
314/*
315 * Code to manage unicode-based screen buffers
316 */
317
318#ifdef NO_VC_UNI_SCREEN
319/* this disables and optimizes related code away at compile time */
320#define get_vc_uniscr(vc) NULL
321#else
322#define get_vc_uniscr(vc) vc->vc_uni_screen
323#endif
324
325#define VC_UNI_SCREEN_DEBUG 0
326
327typedef uint32_t char32_t;
328
329/*
330 * Our screen buffer is preceded by an array of line pointers so that
331 * scrolling only implies some pointer shuffling.
332 */
333struct uni_screen {
334 char32_t *lines[0];
335};
336
337static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
338{
339 struct uni_screen *uniscr;
340 void *p;
341 unsigned int memsize, i;
342
343 /* allocate everything in one go */
344 memsize = cols * rows * sizeof(char32_t);
345 memsize += rows * sizeof(char32_t *);
346 p = vmalloc(memsize);
347 if (!p)
348 return NULL;
349
350 /* initial line pointers */
351 uniscr = p;
352 p = uniscr->lines + rows;
353 for (i = 0; i < rows; i++) {
354 uniscr->lines[i] = p;
355 p += cols * sizeof(char32_t);
356 }
357 return uniscr;
358}
359
360static void vc_uniscr_free(struct uni_screen *uniscr)
361{
362 vfree(uniscr);
363}
364
365static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
366{
367 vc_uniscr_free(vc->vc_uni_screen);
368 vc->vc_uni_screen = new_uniscr;
369}
370
371static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
372{
373 struct uni_screen *uniscr = get_vc_uniscr(vc);
374
375 if (uniscr)
376 uniscr->lines[vc->state.y][vc->state.x] = uc;
377}
378
379static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
380{
381 struct uni_screen *uniscr = get_vc_uniscr(vc);
382
383 if (uniscr) {
384 char32_t *ln = uniscr->lines[vc->state.y];
385 unsigned int x = vc->state.x, cols = vc->vc_cols;
386
387 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
388 memset32(&ln[x], ' ', nr);
389 }
390}
391
392static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
393{
394 struct uni_screen *uniscr = get_vc_uniscr(vc);
395
396 if (uniscr) {
397 char32_t *ln = uniscr->lines[vc->state.y];
398 unsigned int x = vc->state.x, cols = vc->vc_cols;
399
400 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
401 memset32(&ln[cols - nr], ' ', nr);
402 }
403}
404
405static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
406 unsigned int nr)
407{
408 struct uni_screen *uniscr = get_vc_uniscr(vc);
409
410 if (uniscr) {
411 char32_t *ln = uniscr->lines[vc->state.y];
412
413 memset32(&ln[x], ' ', nr);
414 }
415}
416
417static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
418 unsigned int nr)
419{
420 struct uni_screen *uniscr = get_vc_uniscr(vc);
421
422 if (uniscr) {
423 unsigned int cols = vc->vc_cols;
424
425 while (nr--)
426 memset32(uniscr->lines[y++], ' ', cols);
427 }
428}
429
430static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
431 enum con_scroll dir, unsigned int nr)
432{
433 struct uni_screen *uniscr = get_vc_uniscr(vc);
434
435 if (uniscr) {
436 unsigned int i, j, k, sz, d, clear;
437
438 sz = b - t;
439 clear = b - nr;
440 d = nr;
441 if (dir == SM_DOWN) {
442 clear = t;
443 d = sz - nr;
444 }
445 for (i = 0; i < gcd(d, sz); i++) {
446 char32_t *tmp = uniscr->lines[t + i];
447 j = i;
448 while (1) {
449 k = j + d;
450 if (k >= sz)
451 k -= sz;
452 if (k == i)
453 break;
454 uniscr->lines[t + j] = uniscr->lines[t + k];
455 j = k;
456 }
457 uniscr->lines[t + j] = tmp;
458 }
459 vc_uniscr_clear_lines(vc, clear, nr);
460 }
461}
462
463static void vc_uniscr_copy_area(struct uni_screen *dst,
464 unsigned int dst_cols,
465 unsigned int dst_rows,
466 struct uni_screen *src,
467 unsigned int src_cols,
468 unsigned int src_top_row,
469 unsigned int src_bot_row)
470{
471 unsigned int dst_row = 0;
472
473 if (!dst)
474 return;
475
476 while (src_top_row < src_bot_row) {
477 char32_t *src_line = src->lines[src_top_row];
478 char32_t *dst_line = dst->lines[dst_row];
479
480 memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
481 if (dst_cols - src_cols)
482 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
483 src_top_row++;
484 dst_row++;
485 }
486 while (dst_row < dst_rows) {
487 char32_t *dst_line = dst->lines[dst_row];
488
489 memset32(dst_line, ' ', dst_cols);
490 dst_row++;
491 }
492}
493
494/*
495 * Called from vcs_read() to make sure unicode screen retrieval is possible.
496 * This will initialize the unicode screen buffer if not already done.
497 * This returns 0 if OK, or a negative error code otherwise.
498 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
499 */
500int vc_uniscr_check(struct vc_data *vc)
501{
502 struct uni_screen *uniscr;
503 unsigned short *p;
504 int x, y, mask;
505
506 if (__is_defined(NO_VC_UNI_SCREEN))
507 return -EOPNOTSUPP;
508
509 WARN_CONSOLE_UNLOCKED();
510
511 if (!vc->vc_utf)
512 return -ENODATA;
513
514 if (vc->vc_uni_screen)
515 return 0;
516
517 uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
518 if (!uniscr)
519 return -ENOMEM;
520
521 /*
522 * Let's populate it initially with (imperfect) reverse translation.
523 * This is the next best thing we can do short of having it enabled
524 * from the start even when no users rely on this functionality. True
525 * unicode content will be available after a complete screen refresh.
526 */
527 p = (unsigned short *)vc->vc_origin;
528 mask = vc->vc_hi_font_mask | 0xff;
529 for (y = 0; y < vc->vc_rows; y++) {
530 char32_t *line = uniscr->lines[y];
531 for (x = 0; x < vc->vc_cols; x++) {
532 u16 glyph = scr_readw(p++) & mask;
533 line[x] = inverse_translate(vc, glyph, true);
534 }
535 }
536
537 vc->vc_uni_screen = uniscr;
538 return 0;
539}
540
541/*
542 * Called from vcs_read() to get the unicode data from the screen.
543 * This must be preceded by a successful call to vc_uniscr_check() once
544 * the console lock has been taken.
545 */
546void vc_uniscr_copy_line(struct vc_data *vc, void *dest, int viewed,
547 unsigned int row, unsigned int col, unsigned int nr)
548{
549 struct uni_screen *uniscr = get_vc_uniscr(vc);
550 int offset = row * vc->vc_size_row + col * 2;
551 unsigned long pos;
552
553 BUG_ON(!uniscr);
554
555 pos = (unsigned long)screenpos(vc, offset, viewed);
556 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
557 /*
558 * Desired position falls in the main screen buffer.
559 * However the actual row/col might be different if
560 * scrollback is active.
561 */
562 row = (pos - vc->vc_origin) / vc->vc_size_row;
563 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
564 memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
565 } else {
566 /*
567 * Scrollback is active. For now let's simply backtranslate
568 * the screen glyphs until the unicode screen buffer does
569 * synchronize with console display drivers for a scrollback
570 * buffer of its own.
571 */
572 u16 *p = (u16 *)pos;
573 int mask = vc->vc_hi_font_mask | 0xff;
574 char32_t *uni_buf = dest;
575 while (nr--) {
576 u16 glyph = scr_readw(p++) & mask;
577 *uni_buf++ = inverse_translate(vc, glyph, true);
578 }
579 }
580}
581
582/* this is for validation and debugging only */
583static void vc_uniscr_debug_check(struct vc_data *vc)
584{
585 struct uni_screen *uniscr = get_vc_uniscr(vc);
586 unsigned short *p;
587 int x, y, mask;
588
589 if (!VC_UNI_SCREEN_DEBUG || !uniscr)
590 return;
591
592 WARN_CONSOLE_UNLOCKED();
593
594 /*
595 * Make sure our unicode screen translates into the same glyphs
596 * as the actual screen. This is brutal indeed.
597 */
598 p = (unsigned short *)vc->vc_origin;
599 mask = vc->vc_hi_font_mask | 0xff;
600 for (y = 0; y < vc->vc_rows; y++) {
601 char32_t *line = uniscr->lines[y];
602 for (x = 0; x < vc->vc_cols; x++) {
603 u16 glyph = scr_readw(p++) & mask;
604 char32_t uc = line[x];
605 int tc = conv_uni_to_pc(vc, uc);
606 if (tc == -4)
607 tc = conv_uni_to_pc(vc, 0xfffd);
608 if (tc == -4)
609 tc = conv_uni_to_pc(vc, '?');
610 if (tc != glyph)
611 pr_err_ratelimited(
612 "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
613 __func__, x, y, glyph, tc);
614 }
615 }
616}
617
618
619static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
620 enum con_scroll dir, unsigned int nr)
621{
622 u16 *clear, *d, *s;
623
624 if (t + nr >= b)
625 nr = b - t - 1;
626 if (b > vc->vc_rows || t >= b || nr < 1)
627 return;
628 vc_uniscr_scroll(vc, t, b, dir, nr);
629 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
630 return;
631
632 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
633 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
634
635 if (dir == SM_UP) {
636 clear = s + (b - t - nr) * vc->vc_cols;
637 swap(s, d);
638 }
639 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
640 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
641}
642
643static void do_update_region(struct vc_data *vc, unsigned long start, int count)
644{
645 unsigned int xx, yy, offset;
646 u16 *p;
647
648 p = (u16 *) start;
649 if (!vc->vc_sw->con_getxy) {
650 offset = (start - vc->vc_origin) / 2;
651 xx = offset % vc->vc_cols;
652 yy = offset / vc->vc_cols;
653 } else {
654 int nxx, nyy;
655 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
656 xx = nxx; yy = nyy;
657 }
658 for(;;) {
659 u16 attrib = scr_readw(p) & 0xff00;
660 int startx = xx;
661 u16 *q = p;
662 while (xx < vc->vc_cols && count) {
663 if (attrib != (scr_readw(p) & 0xff00)) {
664 if (p > q)
665 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
666 startx = xx;
667 q = p;
668 attrib = scr_readw(p) & 0xff00;
669 }
670 p++;
671 xx++;
672 count--;
673 }
674 if (p > q)
675 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
676 if (!count)
677 break;
678 xx = 0;
679 yy++;
680 if (vc->vc_sw->con_getxy) {
681 p = (u16 *)start;
682 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
683 }
684 }
685}
686
687void update_region(struct vc_data *vc, unsigned long start, int count)
688{
689 WARN_CONSOLE_UNLOCKED();
690
691 if (con_should_update(vc)) {
692 hide_cursor(vc);
693 do_update_region(vc, start, count);
694 set_cursor(vc);
695 }
696}
697
698/* Structure of attributes is hardware-dependent */
699
700static u8 build_attr(struct vc_data *vc, u8 _color,
701 enum vc_intensity _intensity, bool _blink, bool _underline,
702 bool _reverse, bool _italic)
703{
704 if (vc->vc_sw->con_build_attr)
705 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
706 _blink, _underline, _reverse, _italic);
707
708/*
709 * ++roman: I completely changed the attribute format for monochrome
710 * mode (!can_do_color). The formerly used MDA (monochrome display
711 * adapter) format didn't allow the combination of certain effects.
712 * Now the attribute is just a bit vector:
713 * Bit 0..1: intensity (0..2)
714 * Bit 2 : underline
715 * Bit 3 : reverse
716 * Bit 7 : blink
717 */
718 {
719 u8 a = _color;
720 if (!vc->vc_can_do_color)
721 return _intensity |
722 (_italic << 1) |
723 (_underline << 2) |
724 (_reverse << 3) |
725 (_blink << 7);
726 if (_italic)
727 a = (a & 0xF0) | vc->vc_itcolor;
728 else if (_underline)
729 a = (a & 0xf0) | vc->vc_ulcolor;
730 else if (_intensity == VCI_HALF_BRIGHT)
731 a = (a & 0xf0) | vc->vc_halfcolor;
732 if (_reverse)
733 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
734 if (_blink)
735 a ^= 0x80;
736 if (_intensity == VCI_BOLD)
737 a ^= 0x08;
738 if (vc->vc_hi_font_mask == 0x100)
739 a <<= 1;
740 return a;
741 }
742}
743
744static void update_attr(struct vc_data *vc)
745{
746 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
747 vc->state.blink, vc->state.underline,
748 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
749 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
750 VCI_NORMAL, vc->state.blink, false,
751 vc->vc_decscnm, false) << 8);
752}
753
754/* Note: inverting the screen twice should revert to the original state */
755void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
756{
757 unsigned short *p;
758
759 WARN_CONSOLE_UNLOCKED();
760
761 count /= 2;
762 p = screenpos(vc, offset, viewed);
763 if (vc->vc_sw->con_invert_region) {
764 vc->vc_sw->con_invert_region(vc, p, count);
765 } else {
766 u16 *q = p;
767 int cnt = count;
768 u16 a;
769
770 if (!vc->vc_can_do_color) {
771 while (cnt--) {
772 a = scr_readw(q);
773 a ^= 0x0800;
774 scr_writew(a, q);
775 q++;
776 }
777 } else if (vc->vc_hi_font_mask == 0x100) {
778 while (cnt--) {
779 a = scr_readw(q);
780 a = (a & 0x11ff) |
781 ((a & 0xe000) >> 4) |
782 ((a & 0x0e00) << 4);
783 scr_writew(a, q);
784 q++;
785 }
786 } else {
787 while (cnt--) {
788 a = scr_readw(q);
789 a = (a & 0x88ff) |
790 ((a & 0x7000) >> 4) |
791 ((a & 0x0700) << 4);
792 scr_writew(a, q);
793 q++;
794 }
795 }
796 }
797
798 if (con_should_update(vc))
799 do_update_region(vc, (unsigned long) p, count);
800 notify_update(vc);
801}
802
803/* used by selection: complement pointer position */
804void complement_pos(struct vc_data *vc, int offset)
805{
806 static int old_offset = -1;
807 static unsigned short old;
808 static unsigned short oldx, oldy;
809
810 WARN_CONSOLE_UNLOCKED();
811
812 if (old_offset != -1 && old_offset >= 0 &&
813 old_offset < vc->vc_screenbuf_size) {
814 scr_writew(old, screenpos(vc, old_offset, 1));
815 if (con_should_update(vc))
816 vc->vc_sw->con_putc(vc, old, oldy, oldx);
817 notify_update(vc);
818 }
819
820 old_offset = offset;
821
822 if (offset != -1 && offset >= 0 &&
823 offset < vc->vc_screenbuf_size) {
824 unsigned short new;
825 unsigned short *p;
826 p = screenpos(vc, offset, 1);
827 old = scr_readw(p);
828 new = old ^ vc->vc_complement_mask;
829 scr_writew(new, p);
830 if (con_should_update(vc)) {
831 oldx = (offset >> 1) % vc->vc_cols;
832 oldy = (offset >> 1) / vc->vc_cols;
833 vc->vc_sw->con_putc(vc, new, oldy, oldx);
834 }
835 notify_update(vc);
836 }
837}
838
839static void insert_char(struct vc_data *vc, unsigned int nr)
840{
841 unsigned short *p = (unsigned short *) vc->vc_pos;
842
843 vc_uniscr_insert(vc, nr);
844 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
845 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
846 vc->vc_need_wrap = 0;
847 if (con_should_update(vc))
848 do_update_region(vc, (unsigned long) p,
849 vc->vc_cols - vc->state.x);
850}
851
852static void delete_char(struct vc_data *vc, unsigned int nr)
853{
854 unsigned short *p = (unsigned short *) vc->vc_pos;
855
856 vc_uniscr_delete(vc, nr);
857 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
858 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
859 nr * 2);
860 vc->vc_need_wrap = 0;
861 if (con_should_update(vc))
862 do_update_region(vc, (unsigned long) p,
863 vc->vc_cols - vc->state.x);
864}
865
866static int softcursor_original = -1;
867
868static void add_softcursor(struct vc_data *vc)
869{
870 int i = scr_readw((u16 *) vc->vc_pos);
871 u32 type = vc->vc_cursor_type;
872
873 if (!(type & CUR_SW))
874 return;
875 if (softcursor_original != -1)
876 return;
877 softcursor_original = i;
878 i |= CUR_SET(type);
879 i ^= CUR_CHANGE(type);
880 if ((type & CUR_ALWAYS_BG) &&
881 (softcursor_original & CUR_BG) == (i & CUR_BG))
882 i ^= CUR_BG;
883 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
884 i ^= CUR_FG;
885 scr_writew(i, (u16 *)vc->vc_pos);
886 if (con_should_update(vc))
887 vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x);
888}
889
890static void hide_softcursor(struct vc_data *vc)
891{
892 if (softcursor_original != -1) {
893 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
894 if (con_should_update(vc))
895 vc->vc_sw->con_putc(vc, softcursor_original,
896 vc->state.y, vc->state.x);
897 softcursor_original = -1;
898 }
899}
900
901static void hide_cursor(struct vc_data *vc)
902{
903 if (vc_is_sel(vc))
904 clear_selection();
905
906 vc->vc_sw->con_cursor(vc, CM_ERASE);
907 hide_softcursor(vc);
908}
909
910static void set_cursor(struct vc_data *vc)
911{
912 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
913 return;
914 if (vc->vc_deccm) {
915 if (vc_is_sel(vc))
916 clear_selection();
917 add_softcursor(vc);
918 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
919 vc->vc_sw->con_cursor(vc, CM_DRAW);
920 } else
921 hide_cursor(vc);
922}
923
924static void set_origin(struct vc_data *vc)
925{
926 WARN_CONSOLE_UNLOCKED();
927
928 if (!con_is_visible(vc) ||
929 !vc->vc_sw->con_set_origin ||
930 !vc->vc_sw->con_set_origin(vc))
931 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
932 vc->vc_visible_origin = vc->vc_origin;
933 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
934 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
935 2 * vc->state.x;
936}
937
938static void save_screen(struct vc_data *vc)
939{
940 WARN_CONSOLE_UNLOCKED();
941
942 if (vc->vc_sw->con_save_screen)
943 vc->vc_sw->con_save_screen(vc);
944}
945
946static void flush_scrollback(struct vc_data *vc)
947{
948 WARN_CONSOLE_UNLOCKED();
949
950 set_origin(vc);
951 if (vc->vc_sw->con_flush_scrollback) {
952 vc->vc_sw->con_flush_scrollback(vc);
953 } else if (con_is_visible(vc)) {
954 /*
955 * When no con_flush_scrollback method is provided then the
956 * legacy way for flushing the scrollback buffer is to use
957 * a side effect of the con_switch method. We do it only on
958 * the foreground console as background consoles have no
959 * scrollback buffers in that case and we obviously don't
960 * want to switch to them.
961 */
962 hide_cursor(vc);
963 vc->vc_sw->con_switch(vc);
964 set_cursor(vc);
965 }
966}
967
968/*
969 * Redrawing of screen
970 */
971
972void clear_buffer_attributes(struct vc_data *vc)
973{
974 unsigned short *p = (unsigned short *)vc->vc_origin;
975 int count = vc->vc_screenbuf_size / 2;
976 int mask = vc->vc_hi_font_mask | 0xff;
977
978 for (; count > 0; count--, p++) {
979 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
980 }
981}
982
983void redraw_screen(struct vc_data *vc, int is_switch)
984{
985 int redraw = 0;
986
987 WARN_CONSOLE_UNLOCKED();
988
989 if (!vc) {
990 /* strange ... */
991 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
992 return;
993 }
994
995 if (is_switch) {
996 struct vc_data *old_vc = vc_cons[fg_console].d;
997 if (old_vc == vc)
998 return;
999 if (!con_is_visible(vc))
1000 redraw = 1;
1001 *vc->vc_display_fg = vc;
1002 fg_console = vc->vc_num;
1003 hide_cursor(old_vc);
1004 if (!con_is_visible(old_vc)) {
1005 save_screen(old_vc);
1006 set_origin(old_vc);
1007 }
1008 if (tty0dev)
1009 sysfs_notify(&tty0dev->kobj, NULL, "active");
1010 } else {
1011 hide_cursor(vc);
1012 redraw = 1;
1013 }
1014
1015 if (redraw) {
1016 int update;
1017 int old_was_color = vc->vc_can_do_color;
1018
1019 set_origin(vc);
1020 update = vc->vc_sw->con_switch(vc);
1021 set_palette(vc);
1022 /*
1023 * If console changed from mono<->color, the best we can do
1024 * is to clear the buffer attributes. As it currently stands,
1025 * rebuilding new attributes from the old buffer is not doable
1026 * without overly complex code.
1027 */
1028 if (old_was_color != vc->vc_can_do_color) {
1029 update_attr(vc);
1030 clear_buffer_attributes(vc);
1031 }
1032
1033 if (update && vc->vc_mode != KD_GRAPHICS)
1034 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1035 }
1036 set_cursor(vc);
1037 if (is_switch) {
1038 set_leds();
1039 compute_shiftstate();
1040 notify_update(vc);
1041 }
1042}
1043
1044/*
1045 * Allocation, freeing and resizing of VTs.
1046 */
1047
1048int vc_cons_allocated(unsigned int i)
1049{
1050 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1051}
1052
1053static void visual_init(struct vc_data *vc, int num, int init)
1054{
1055 /* ++Geert: vc->vc_sw->con_init determines console size */
1056 if (vc->vc_sw)
1057 module_put(vc->vc_sw->owner);
1058 vc->vc_sw = conswitchp;
1059#ifndef VT_SINGLE_DRIVER
1060 if (con_driver_map[num])
1061 vc->vc_sw = con_driver_map[num];
1062#endif
1063 __module_get(vc->vc_sw->owner);
1064 vc->vc_num = num;
1065 vc->vc_display_fg = &master_display_fg;
1066 if (vc->vc_uni_pagedir_loc)
1067 con_free_unimap(vc);
1068 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
1069 vc->vc_uni_pagedir = NULL;
1070 vc->vc_hi_font_mask = 0;
1071 vc->vc_complement_mask = 0;
1072 vc->vc_can_do_color = 0;
1073 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1074 vc->vc_sw->con_init(vc, init);
1075 if (!vc->vc_complement_mask)
1076 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1077 vc->vc_s_complement_mask = vc->vc_complement_mask;
1078 vc->vc_size_row = vc->vc_cols << 1;
1079 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1080}
1081
1082
1083static void visual_deinit(struct vc_data *vc)
1084{
1085 vc->vc_sw->con_deinit(vc);
1086 module_put(vc->vc_sw->owner);
1087}
1088
1089static void vc_port_destruct(struct tty_port *port)
1090{
1091 struct vc_data *vc = container_of(port, struct vc_data, port);
1092
1093 kfree(vc);
1094}
1095
1096static const struct tty_port_operations vc_port_ops = {
1097 .destruct = vc_port_destruct,
1098};
1099
1100/*
1101 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1102 * [this is to be used together with some user program
1103 * like resize that changes the hardware videomode]
1104 */
1105#define VC_MAXCOL (32767)
1106#define VC_MAXROW (32767)
1107
1108int vc_allocate(unsigned int currcons) /* return 0 on success */
1109{
1110 struct vt_notifier_param param;
1111 struct vc_data *vc;
1112 int err;
1113
1114 WARN_CONSOLE_UNLOCKED();
1115
1116 if (currcons >= MAX_NR_CONSOLES)
1117 return -ENXIO;
1118
1119 if (vc_cons[currcons].d)
1120 return 0;
1121
1122 /* due to the granularity of kmalloc, we waste some memory here */
1123 /* the alloc is done in two steps, to optimize the common situation
1124 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1125 /* although the numbers above are not valid since long ago, the
1126 point is still up-to-date and the comment still has its value
1127 even if only as a historical artifact. --mj, July 1998 */
1128 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1129 if (!vc)
1130 return -ENOMEM;
1131
1132 vc_cons[currcons].d = vc;
1133 tty_port_init(&vc->port);
1134 vc->port.ops = &vc_port_ops;
1135 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1136
1137 visual_init(vc, currcons, 1);
1138
1139 if (!*vc->vc_uni_pagedir_loc)
1140 con_set_default_unimap(vc);
1141
1142 err = -EINVAL;
1143 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1144 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1145 goto err_free;
1146 err = -ENOMEM;
1147 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1148 if (!vc->vc_screenbuf)
1149 goto err_free;
1150
1151 /* If no drivers have overridden us and the user didn't pass a
1152 boot option, default to displaying the cursor */
1153 if (global_cursor_default == -1)
1154 global_cursor_default = 1;
1155
1156 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1157 vcs_make_sysfs(currcons);
1158 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
1159
1160 return 0;
1161err_free:
1162 visual_deinit(vc);
1163 kfree(vc);
1164 vc_cons[currcons].d = NULL;
1165 return err;
1166}
1167
1168static inline int resize_screen(struct vc_data *vc, int width, int height,
1169 int user)
1170{
1171 /* Resizes the resolution of the display adapater */
1172 int err = 0;
1173
1174 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
1175 err = vc->vc_sw->con_resize(vc, width, height, user);
1176
1177 return err;
1178}
1179
1180/**
1181 * vc_do_resize - resizing method for the tty
1182 * @tty: tty being resized
1183 * @real_tty: real tty (different to tty if a pty/tty pair)
1184 * @vc: virtual console private data
1185 * @cols: columns
1186 * @lines: lines
1187 *
1188 * Resize a virtual console, clipping according to the actual constraints.
1189 * If the caller passes a tty structure then update the termios winsize
1190 * information and perform any necessary signal handling.
1191 *
1192 * Caller must hold the console semaphore. Takes the termios rwsem and
1193 * ctrl_lock of the tty IFF a tty is passed.
1194 */
1195
1196static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1197 unsigned int cols, unsigned int lines)
1198{
1199 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1200 unsigned long end;
1201 unsigned int old_rows, old_row_size, first_copied_row;
1202 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1203 unsigned int user;
1204 unsigned short *oldscreen, *newscreen;
1205 struct uni_screen *new_uniscr = NULL;
1206
1207 WARN_CONSOLE_UNLOCKED();
1208
1209 if (!vc)
1210 return -ENXIO;
1211
1212 user = vc->vc_resize_user;
1213 vc->vc_resize_user = 0;
1214
1215 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1216 return -EINVAL;
1217
1218 new_cols = (cols ? cols : vc->vc_cols);
1219 new_rows = (lines ? lines : vc->vc_rows);
1220 new_row_size = new_cols << 1;
1221 new_screen_size = new_row_size * new_rows;
1222
1223 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1224 return 0;
1225
1226 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1227 return -EINVAL;
1228 newscreen = kzalloc(new_screen_size, GFP_USER);
1229 if (!newscreen)
1230 return -ENOMEM;
1231
1232 if (get_vc_uniscr(vc)) {
1233 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1234 if (!new_uniscr) {
1235 kfree(newscreen);
1236 return -ENOMEM;
1237 }
1238 }
1239
1240 if (vc_is_sel(vc))
1241 clear_selection();
1242
1243 old_rows = vc->vc_rows;
1244 old_row_size = vc->vc_size_row;
1245
1246 err = resize_screen(vc, new_cols, new_rows, user);
1247 if (err) {
1248 kfree(newscreen);
1249 vc_uniscr_free(new_uniscr);
1250 return err;
1251 }
1252
1253 vc->vc_rows = new_rows;
1254 vc->vc_cols = new_cols;
1255 vc->vc_size_row = new_row_size;
1256 vc->vc_screenbuf_size = new_screen_size;
1257
1258 rlth = min(old_row_size, new_row_size);
1259 rrem = new_row_size - rlth;
1260 old_origin = vc->vc_origin;
1261 new_origin = (long) newscreen;
1262 new_scr_end = new_origin + new_screen_size;
1263
1264 if (vc->state.y > new_rows) {
1265 if (old_rows - vc->state.y < new_rows) {
1266 /*
1267 * Cursor near the bottom, copy contents from the
1268 * bottom of buffer
1269 */
1270 first_copied_row = (old_rows - new_rows);
1271 } else {
1272 /*
1273 * Cursor is in no man's land, copy 1/2 screenful
1274 * from the top and bottom of cursor position
1275 */
1276 first_copied_row = (vc->state.y - new_rows/2);
1277 }
1278 old_origin += first_copied_row * old_row_size;
1279 } else
1280 first_copied_row = 0;
1281 end = old_origin + old_row_size * min(old_rows, new_rows);
1282
1283 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1284 get_vc_uniscr(vc), rlth/2, first_copied_row,
1285 min(old_rows, new_rows));
1286 vc_uniscr_set(vc, new_uniscr);
1287
1288 update_attr(vc);
1289
1290 while (old_origin < end) {
1291 scr_memcpyw((unsigned short *) new_origin,
1292 (unsigned short *) old_origin, rlth);
1293 if (rrem)
1294 scr_memsetw((void *)(new_origin + rlth),
1295 vc->vc_video_erase_char, rrem);
1296 old_origin += old_row_size;
1297 new_origin += new_row_size;
1298 }
1299 if (new_scr_end > new_origin)
1300 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1301 new_scr_end - new_origin);
1302 oldscreen = vc->vc_screenbuf;
1303 vc->vc_screenbuf = newscreen;
1304 vc->vc_screenbuf_size = new_screen_size;
1305 set_origin(vc);
1306 kfree(oldscreen);
1307
1308 /* do part of a reset_terminal() */
1309 vc->vc_top = 0;
1310 vc->vc_bottom = vc->vc_rows;
1311 gotoxy(vc, vc->state.x, vc->state.y);
1312 save_cur(vc);
1313
1314 if (tty) {
1315 /* Rewrite the requested winsize data with the actual
1316 resulting sizes */
1317 struct winsize ws;
1318 memset(&ws, 0, sizeof(ws));
1319 ws.ws_row = vc->vc_rows;
1320 ws.ws_col = vc->vc_cols;
1321 ws.ws_ypixel = vc->vc_scan_lines;
1322 tty_do_resize(tty, &ws);
1323 }
1324
1325 if (con_is_visible(vc))
1326 update_screen(vc);
1327 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1328 notify_update(vc);
1329 return err;
1330}
1331
1332/**
1333 * vc_resize - resize a VT
1334 * @vc: virtual console
1335 * @cols: columns
1336 * @rows: rows
1337 *
1338 * Resize a virtual console as seen from the console end of things. We
1339 * use the common vc_do_resize methods to update the structures. The
1340 * caller must hold the console sem to protect console internals and
1341 * vc->port.tty
1342 */
1343
1344int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1345{
1346 return vc_do_resize(vc->port.tty, vc, cols, rows);
1347}
1348
1349/**
1350 * vt_resize - resize a VT
1351 * @tty: tty to resize
1352 * @ws: winsize attributes
1353 *
1354 * Resize a virtual terminal. This is called by the tty layer as we
1355 * register our own handler for resizing. The mutual helper does all
1356 * the actual work.
1357 *
1358 * Takes the console sem and the called methods then take the tty
1359 * termios_rwsem and the tty ctrl_lock in that order.
1360 */
1361static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1362{
1363 struct vc_data *vc = tty->driver_data;
1364 int ret;
1365
1366 console_lock();
1367 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1368 console_unlock();
1369 return ret;
1370}
1371
1372struct vc_data *vc_deallocate(unsigned int currcons)
1373{
1374 struct vc_data *vc = NULL;
1375
1376 WARN_CONSOLE_UNLOCKED();
1377
1378 if (vc_cons_allocated(currcons)) {
1379 struct vt_notifier_param param;
1380
1381 param.vc = vc = vc_cons[currcons].d;
1382 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1383 vcs_remove_sysfs(currcons);
1384 visual_deinit(vc);
1385 put_pid(vc->vt_pid);
1386 vc_uniscr_set(vc, NULL);
1387 kfree(vc->vc_screenbuf);
1388 vc_cons[currcons].d = NULL;
1389 }
1390 return vc;
1391}
1392
1393/*
1394 * VT102 emulator
1395 */
1396
1397enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1398
1399#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1400#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1401#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1402
1403#define decarm VC_REPEAT
1404#define decckm VC_CKMODE
1405#define kbdapplic VC_APPLIC
1406#define lnm VC_CRLF
1407
1408const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1409 8,12,10,14, 9,13,11,15 };
1410
1411/* the default colour table, for VGA+ colour systems */
1412unsigned char default_red[] = {
1413 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1414 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1415};
1416module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1417
1418unsigned char default_grn[] = {
1419 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1420 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1421};
1422module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1423
1424unsigned char default_blu[] = {
1425 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1426 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1427};
1428module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1429
1430/*
1431 * gotoxy() must verify all boundaries, because the arguments
1432 * might also be negative. If the given position is out of
1433 * bounds, the cursor is placed at the nearest margin.
1434 */
1435static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1436{
1437 int min_y, max_y;
1438
1439 if (new_x < 0)
1440 vc->state.x = 0;
1441 else {
1442 if (new_x >= vc->vc_cols)
1443 vc->state.x = vc->vc_cols - 1;
1444 else
1445 vc->state.x = new_x;
1446 }
1447
1448 if (vc->vc_decom) {
1449 min_y = vc->vc_top;
1450 max_y = vc->vc_bottom;
1451 } else {
1452 min_y = 0;
1453 max_y = vc->vc_rows;
1454 }
1455 if (new_y < min_y)
1456 vc->state.y = min_y;
1457 else if (new_y >= max_y)
1458 vc->state.y = max_y - 1;
1459 else
1460 vc->state.y = new_y;
1461 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1462 (vc->state.x << 1);
1463 vc->vc_need_wrap = 0;
1464}
1465
1466/* for absolute user moves, when decom is set */
1467static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1468{
1469 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1470}
1471
1472void scrollback(struct vc_data *vc)
1473{
1474 scrolldelta(-(vc->vc_rows / 2));
1475}
1476
1477void scrollfront(struct vc_data *vc, int lines)
1478{
1479 if (!lines)
1480 lines = vc->vc_rows / 2;
1481 scrolldelta(lines);
1482}
1483
1484static void lf(struct vc_data *vc)
1485{
1486 /* don't scroll if above bottom of scrolling region, or
1487 * if below scrolling region
1488 */
1489 if (vc->state.y + 1 == vc->vc_bottom)
1490 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1491 else if (vc->state.y < vc->vc_rows - 1) {
1492 vc->state.y++;
1493 vc->vc_pos += vc->vc_size_row;
1494 }
1495 vc->vc_need_wrap = 0;
1496 notify_write(vc, '\n');
1497}
1498
1499static void ri(struct vc_data *vc)
1500{
1501 /* don't scroll if below top of scrolling region, or
1502 * if above scrolling region
1503 */
1504 if (vc->state.y == vc->vc_top)
1505 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1506 else if (vc->state.y > 0) {
1507 vc->state.y--;
1508 vc->vc_pos -= vc->vc_size_row;
1509 }
1510 vc->vc_need_wrap = 0;
1511}
1512
1513static inline void cr(struct vc_data *vc)
1514{
1515 vc->vc_pos -= vc->state.x << 1;
1516 vc->vc_need_wrap = vc->state.x = 0;
1517 notify_write(vc, '\r');
1518}
1519
1520static inline void bs(struct vc_data *vc)
1521{
1522 if (vc->state.x) {
1523 vc->vc_pos -= 2;
1524 vc->state.x--;
1525 vc->vc_need_wrap = 0;
1526 notify_write(vc, '\b');
1527 }
1528}
1529
1530static inline void del(struct vc_data *vc)
1531{
1532 /* ignored */
1533}
1534
1535static void csi_J(struct vc_data *vc, int vpar)
1536{
1537 unsigned int count;
1538 unsigned short * start;
1539
1540 switch (vpar) {
1541 case 0: /* erase from cursor to end of display */
1542 vc_uniscr_clear_line(vc, vc->state.x,
1543 vc->vc_cols - vc->state.x);
1544 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1545 vc->vc_rows - vc->state.y - 1);
1546 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1547 start = (unsigned short *)vc->vc_pos;
1548 break;
1549 case 1: /* erase from start to cursor */
1550 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1551 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1552 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1553 start = (unsigned short *)vc->vc_origin;
1554 break;
1555 case 3: /* include scrollback */
1556 flush_scrollback(vc);
1557 fallthrough;
1558 case 2: /* erase whole display */
1559 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1560 count = vc->vc_cols * vc->vc_rows;
1561 start = (unsigned short *)vc->vc_origin;
1562 break;
1563 default:
1564 return;
1565 }
1566 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1567 if (con_should_update(vc))
1568 do_update_region(vc, (unsigned long) start, count);
1569 vc->vc_need_wrap = 0;
1570}
1571
1572static void csi_K(struct vc_data *vc, int vpar)
1573{
1574 unsigned int count;
1575 unsigned short *start = (unsigned short *)vc->vc_pos;
1576 int offset;
1577
1578 switch (vpar) {
1579 case 0: /* erase from cursor to end of line */
1580 offset = 0;
1581 count = vc->vc_cols - vc->state.x;
1582 break;
1583 case 1: /* erase from start of line to cursor */
1584 offset = -vc->state.x;
1585 count = vc->state.x + 1;
1586 break;
1587 case 2: /* erase whole line */
1588 offset = -vc->state.x;
1589 count = vc->vc_cols;
1590 break;
1591 default:
1592 return;
1593 }
1594 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
1595 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1596 vc->vc_need_wrap = 0;
1597 if (con_should_update(vc))
1598 do_update_region(vc, (unsigned long)(start + offset), count);
1599}
1600
1601/* erase the following vpar positions */
1602static void csi_X(struct vc_data *vc, unsigned int vpar)
1603{ /* not vt100? */
1604 unsigned int count;
1605
1606 if (!vpar)
1607 vpar++;
1608
1609 count = min(vpar, vc->vc_cols - vc->state.x);
1610
1611 vc_uniscr_clear_line(vc, vc->state.x, count);
1612 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1613 if (con_should_update(vc))
1614 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
1615 vc->vc_need_wrap = 0;
1616}
1617
1618static void default_attr(struct vc_data *vc)
1619{
1620 vc->state.intensity = VCI_NORMAL;
1621 vc->state.italic = false;
1622 vc->state.underline = false;
1623 vc->state.reverse = false;
1624 vc->state.blink = false;
1625 vc->state.color = vc->vc_def_color;
1626}
1627
1628struct rgb { u8 r; u8 g; u8 b; };
1629
1630static void rgb_from_256(int i, struct rgb *c)
1631{
1632 if (i < 8) { /* Standard colours. */
1633 c->r = i&1 ? 0xaa : 0x00;
1634 c->g = i&2 ? 0xaa : 0x00;
1635 c->b = i&4 ? 0xaa : 0x00;
1636 } else if (i < 16) {
1637 c->r = i&1 ? 0xff : 0x55;
1638 c->g = i&2 ? 0xff : 0x55;
1639 c->b = i&4 ? 0xff : 0x55;
1640 } else if (i < 232) { /* 6x6x6 colour cube. */
1641 c->r = (i - 16) / 36 * 85 / 2;
1642 c->g = (i - 16) / 6 % 6 * 85 / 2;
1643 c->b = (i - 16) % 6 * 85 / 2;
1644 } else /* Grayscale ramp. */
1645 c->r = c->g = c->b = i * 10 - 2312;
1646}
1647
1648static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1649{
1650 u8 hue = 0, max = max3(c->r, c->g, c->b);
1651
1652 if (c->r > max / 2)
1653 hue |= 4;
1654 if (c->g > max / 2)
1655 hue |= 2;
1656 if (c->b > max / 2)
1657 hue |= 1;
1658
1659 if (hue == 7 && max <= 0x55) {
1660 hue = 0;
1661 vc->state.intensity = VCI_BOLD;
1662 } else if (max > 0xaa)
1663 vc->state.intensity = VCI_BOLD;
1664 else
1665 vc->state.intensity = VCI_NORMAL;
1666
1667 vc->state.color = (vc->state.color & 0xf0) | hue;
1668}
1669
1670static void rgb_background(struct vc_data *vc, const struct rgb *c)
1671{
1672 /* For backgrounds, err on the dark side. */
1673 vc->state.color = (vc->state.color & 0x0f)
1674 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1675}
1676
1677/*
1678 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1679 * and thus need to be detected and ignored by hand. That standard also
1680 * wants : rather than ; as separators but sequences containing : are currently
1681 * completely ignored by the parser.
1682 *
1683 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1684 * supporting them.
1685 */
1686static int vc_t416_color(struct vc_data *vc, int i,
1687 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1688{
1689 struct rgb c;
1690
1691 i++;
1692 if (i > vc->vc_npar)
1693 return i;
1694
1695 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1696 /* 256 colours */
1697 i++;
1698 rgb_from_256(vc->vc_par[i], &c);
1699 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1700 /* 24 bit */
1701 c.r = vc->vc_par[i + 1];
1702 c.g = vc->vc_par[i + 2];
1703 c.b = vc->vc_par[i + 3];
1704 i += 3;
1705 } else
1706 return i;
1707
1708 set_color(vc, &c);
1709
1710 return i;
1711}
1712
1713/* console_lock is held */
1714static void csi_m(struct vc_data *vc)
1715{
1716 int i;
1717
1718 for (i = 0; i <= vc->vc_npar; i++)
1719 switch (vc->vc_par[i]) {
1720 case 0: /* all attributes off */
1721 default_attr(vc);
1722 break;
1723 case 1:
1724 vc->state.intensity = VCI_BOLD;
1725 break;
1726 case 2:
1727 vc->state.intensity = VCI_HALF_BRIGHT;
1728 break;
1729 case 3:
1730 vc->state.italic = true;
1731 break;
1732 case 21:
1733 /*
1734 * No console drivers support double underline, so
1735 * convert it to a single underline.
1736 */
1737 case 4:
1738 vc->state.underline = true;
1739 break;
1740 case 5:
1741 vc->state.blink = true;
1742 break;
1743 case 7:
1744 vc->state.reverse = true;
1745 break;
1746 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1747 * Select primary font, don't display control chars if
1748 * defined, don't set bit 8 on output.
1749 */
1750 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
1751 vc->vc_disp_ctrl = 0;
1752 vc->vc_toggle_meta = 0;
1753 break;
1754 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1755 * Select first alternate font, lets chars < 32 be
1756 * displayed as ROM chars.
1757 */
1758 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1759 vc->vc_disp_ctrl = 1;
1760 vc->vc_toggle_meta = 0;
1761 break;
1762 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1763 * Select second alternate font, toggle high bit
1764 * before displaying as ROM char.
1765 */
1766 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1767 vc->vc_disp_ctrl = 1;
1768 vc->vc_toggle_meta = 1;
1769 break;
1770 case 22:
1771 vc->state.intensity = VCI_NORMAL;
1772 break;
1773 case 23:
1774 vc->state.italic = false;
1775 break;
1776 case 24:
1777 vc->state.underline = false;
1778 break;
1779 case 25:
1780 vc->state.blink = false;
1781 break;
1782 case 27:
1783 vc->state.reverse = false;
1784 break;
1785 case 38:
1786 i = vc_t416_color(vc, i, rgb_foreground);
1787 break;
1788 case 48:
1789 i = vc_t416_color(vc, i, rgb_background);
1790 break;
1791 case 39:
1792 vc->state.color = (vc->vc_def_color & 0x0f) |
1793 (vc->state.color & 0xf0);
1794 break;
1795 case 49:
1796 vc->state.color = (vc->vc_def_color & 0xf0) |
1797 (vc->state.color & 0x0f);
1798 break;
1799 default:
1800 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1801 if (vc->vc_par[i] < 100)
1802 vc->state.intensity = VCI_BOLD;
1803 vc->vc_par[i] -= 60;
1804 }
1805 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1806 vc->state.color = color_table[vc->vc_par[i] - 30]
1807 | (vc->state.color & 0xf0);
1808 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1809 vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
1810 | (vc->state.color & 0x0f);
1811 break;
1812 }
1813 update_attr(vc);
1814}
1815
1816static void respond_string(const char *p, size_t len, struct tty_port *port)
1817{
1818 tty_insert_flip_string(port, p, len);
1819 tty_schedule_flip(port);
1820}
1821
1822static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1823{
1824 char buf[40];
1825 int len;
1826
1827 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1828 (vc->vc_decom ? vc->vc_top + 1 : 1),
1829 vc->state.x + 1);
1830 respond_string(buf, len, tty->port);
1831}
1832
1833static inline void status_report(struct tty_struct *tty)
1834{
1835 static const char teminal_ok[] = "\033[0n";
1836
1837 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1838}
1839
1840static inline void respond_ID(struct tty_struct *tty)
1841{
1842 /* terminal answer to an ESC-Z or csi0c query. */
1843 static const char vt102_id[] = "\033[?6c";
1844
1845 respond_string(vt102_id, strlen(vt102_id), tty->port);
1846}
1847
1848void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1849{
1850 char buf[8];
1851 int len;
1852
1853 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1854 (char)('!' + mrx), (char)('!' + mry));
1855 respond_string(buf, len, tty->port);
1856}
1857
1858/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1859int mouse_reporting(void)
1860{
1861 return vc_cons[fg_console].d->vc_report_mouse;
1862}
1863
1864/* console_lock is held */
1865static void set_mode(struct vc_data *vc, int on_off)
1866{
1867 int i;
1868
1869 for (i = 0; i <= vc->vc_npar; i++)
1870 if (vc->vc_priv == EPdec) {
1871 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1872 case 1: /* Cursor keys send ^[Ox/^[[x */
1873 if (on_off)
1874 set_kbd(vc, decckm);
1875 else
1876 clr_kbd(vc, decckm);
1877 break;
1878 case 3: /* 80/132 mode switch unimplemented */
1879#if 0
1880 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1881 /* this alone does not suffice; some user mode
1882 utility has to change the hardware regs */
1883#endif
1884 break;
1885 case 5: /* Inverted screen on/off */
1886 if (vc->vc_decscnm != on_off) {
1887 vc->vc_decscnm = on_off;
1888 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1889 update_attr(vc);
1890 }
1891 break;
1892 case 6: /* Origin relative/absolute */
1893 vc->vc_decom = on_off;
1894 gotoxay(vc, 0, 0);
1895 break;
1896 case 7: /* Autowrap on/off */
1897 vc->vc_decawm = on_off;
1898 break;
1899 case 8: /* Autorepeat on/off */
1900 if (on_off)
1901 set_kbd(vc, decarm);
1902 else
1903 clr_kbd(vc, decarm);
1904 break;
1905 case 9:
1906 vc->vc_report_mouse = on_off ? 1 : 0;
1907 break;
1908 case 25: /* Cursor on/off */
1909 vc->vc_deccm = on_off;
1910 break;
1911 case 1000:
1912 vc->vc_report_mouse = on_off ? 2 : 0;
1913 break;
1914 }
1915 } else {
1916 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1917 case 3: /* Monitor (display ctrls) */
1918 vc->vc_disp_ctrl = on_off;
1919 break;
1920 case 4: /* Insert Mode on/off */
1921 vc->vc_decim = on_off;
1922 break;
1923 case 20: /* Lf, Enter == CrLf/Lf */
1924 if (on_off)
1925 set_kbd(vc, lnm);
1926 else
1927 clr_kbd(vc, lnm);
1928 break;
1929 }
1930 }
1931}
1932
1933/* console_lock is held */
1934static void setterm_command(struct vc_data *vc)
1935{
1936 switch (vc->vc_par[0]) {
1937 case 1: /* set color for underline mode */
1938 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1939 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1940 if (vc->state.underline)
1941 update_attr(vc);
1942 }
1943 break;
1944 case 2: /* set color for half intensity mode */
1945 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1946 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1947 if (vc->state.intensity == VCI_HALF_BRIGHT)
1948 update_attr(vc);
1949 }
1950 break;
1951 case 8: /* store colors as defaults */
1952 vc->vc_def_color = vc->vc_attr;
1953 if (vc->vc_hi_font_mask == 0x100)
1954 vc->vc_def_color >>= 1;
1955 default_attr(vc);
1956 update_attr(vc);
1957 break;
1958 case 9: /* set blanking interval */
1959 blankinterval = min(vc->vc_par[1], 60U) * 60;
1960 poke_blanked_console();
1961 break;
1962 case 10: /* set bell frequency in Hz */
1963 if (vc->vc_npar >= 1)
1964 vc->vc_bell_pitch = vc->vc_par[1];
1965 else
1966 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1967 break;
1968 case 11: /* set bell duration in msec */
1969 if (vc->vc_npar >= 1)
1970 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1971 msecs_to_jiffies(vc->vc_par[1]) : 0;
1972 else
1973 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1974 break;
1975 case 12: /* bring specified console to the front */
1976 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1977 set_console(vc->vc_par[1] - 1);
1978 break;
1979 case 13: /* unblank the screen */
1980 poke_blanked_console();
1981 break;
1982 case 14: /* set vesa powerdown interval */
1983 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
1984 break;
1985 case 15: /* activate the previous console */
1986 set_console(last_console);
1987 break;
1988 case 16: /* set cursor blink duration in msec */
1989 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1990 vc->vc_par[1] <= USHRT_MAX)
1991 vc->vc_cur_blink_ms = vc->vc_par[1];
1992 else
1993 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1994 break;
1995 }
1996}
1997
1998/* console_lock is held */
1999static void csi_at(struct vc_data *vc, unsigned int nr)
2000{
2001 if (nr > vc->vc_cols - vc->state.x)
2002 nr = vc->vc_cols - vc->state.x;
2003 else if (!nr)
2004 nr = 1;
2005 insert_char(vc, nr);
2006}
2007
2008/* console_lock is held */
2009static void csi_L(struct vc_data *vc, unsigned int nr)
2010{
2011 if (nr > vc->vc_rows - vc->state.y)
2012 nr = vc->vc_rows - vc->state.y;
2013 else if (!nr)
2014 nr = 1;
2015 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
2016 vc->vc_need_wrap = 0;
2017}
2018
2019/* console_lock is held */
2020static void csi_P(struct vc_data *vc, unsigned int nr)
2021{
2022 if (nr > vc->vc_cols - vc->state.x)
2023 nr = vc->vc_cols - vc->state.x;
2024 else if (!nr)
2025 nr = 1;
2026 delete_char(vc, nr);
2027}
2028
2029/* console_lock is held */
2030static void csi_M(struct vc_data *vc, unsigned int nr)
2031{
2032 if (nr > vc->vc_rows - vc->state.y)
2033 nr = vc->vc_rows - vc->state.y;
2034 else if (!nr)
2035 nr=1;
2036 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
2037 vc->vc_need_wrap = 0;
2038}
2039
2040/* console_lock is held (except via vc_init->reset_terminal */
2041static void save_cur(struct vc_data *vc)
2042{
2043 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
2044}
2045
2046/* console_lock is held */
2047static void restore_cur(struct vc_data *vc)
2048{
2049 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2050
2051 gotoxy(vc, vc->state.x, vc->state.y);
2052 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2053 vc);
2054 update_attr(vc);
2055 vc->vc_need_wrap = 0;
2056}
2057
2058enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2059 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2060 ESpalette, ESosc };
2061
2062/* console_lock is held (except via vc_init()) */
2063static void reset_terminal(struct vc_data *vc, int do_clear)
2064{
2065 unsigned int i;
2066
2067 vc->vc_top = 0;
2068 vc->vc_bottom = vc->vc_rows;
2069 vc->vc_state = ESnormal;
2070 vc->vc_priv = EPecma;
2071 vc->vc_translate = set_translate(LAT1_MAP, vc);
2072 vc->state.Gx_charset[0] = LAT1_MAP;
2073 vc->state.Gx_charset[1] = GRAF_MAP;
2074 vc->state.charset = 0;
2075 vc->vc_need_wrap = 0;
2076 vc->vc_report_mouse = 0;
2077 vc->vc_utf = default_utf8;
2078 vc->vc_utf_count = 0;
2079
2080 vc->vc_disp_ctrl = 0;
2081 vc->vc_toggle_meta = 0;
2082
2083 vc->vc_decscnm = 0;
2084 vc->vc_decom = 0;
2085 vc->vc_decawm = 1;
2086 vc->vc_deccm = global_cursor_default;
2087 vc->vc_decim = 0;
2088
2089 vt_reset_keyboard(vc->vc_num);
2090
2091 vc->vc_cursor_type = cur_default;
2092 vc->vc_complement_mask = vc->vc_s_complement_mask;
2093
2094 default_attr(vc);
2095 update_attr(vc);
2096
2097 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2098 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2099 set_bit(i, vc->vc_tab_stop);
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
2111static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
2112{
2113 unsigned char *charset = &vc->state.Gx_charset[which];
2114
2115 switch (c) {
2116 case '0':
2117 *charset = GRAF_MAP;
2118 break;
2119 case 'B':
2120 *charset = LAT1_MAP;
2121 break;
2122 case 'U':
2123 *charset = IBMPC_MAP;
2124 break;
2125 case 'K':
2126 *charset = USER_MAP;
2127 break;
2128 }
2129
2130 if (vc->state.charset == which)
2131 vc->vc_translate = set_translate(*charset, vc);
2132}
2133
2134/* console_lock is held */
2135static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2136{
2137 /*
2138 * Control characters can be used in the _middle_
2139 * of an escape sequence.
2140 */
2141 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2142 return;
2143 switch (c) {
2144 case 0:
2145 return;
2146 case 7:
2147 if (vc->vc_state == ESosc)
2148 vc->vc_state = ESnormal;
2149 else if (vc->vc_bell_duration)
2150 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2151 return;
2152 case 8:
2153 bs(vc);
2154 return;
2155 case 9:
2156 vc->vc_pos -= (vc->state.x << 1);
2157
2158 vc->state.x = find_next_bit(vc->vc_tab_stop,
2159 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2160 vc->state.x + 1);
2161 if (vc->state.x >= VC_TABSTOPS_COUNT)
2162 vc->state.x = vc->vc_cols - 1;
2163
2164 vc->vc_pos += (vc->state.x << 1);
2165 notify_write(vc, '\t');
2166 return;
2167 case 10: case 11: case 12:
2168 lf(vc);
2169 if (!is_kbd(vc, lnm))
2170 return;
2171 fallthrough;
2172 case 13:
2173 cr(vc);
2174 return;
2175 case 14:
2176 vc->state.charset = 1;
2177 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
2178 vc->vc_disp_ctrl = 1;
2179 return;
2180 case 15:
2181 vc->state.charset = 0;
2182 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
2183 vc->vc_disp_ctrl = 0;
2184 return;
2185 case 24: case 26:
2186 vc->vc_state = ESnormal;
2187 return;
2188 case 27:
2189 vc->vc_state = ESesc;
2190 return;
2191 case 127:
2192 del(vc);
2193 return;
2194 case 128+27:
2195 vc->vc_state = ESsquare;
2196 return;
2197 }
2198 switch(vc->vc_state) {
2199 case ESesc:
2200 vc->vc_state = ESnormal;
2201 switch (c) {
2202 case '[':
2203 vc->vc_state = ESsquare;
2204 return;
2205 case ']':
2206 vc->vc_state = ESnonstd;
2207 return;
2208 case '%':
2209 vc->vc_state = ESpercent;
2210 return;
2211 case 'E':
2212 cr(vc);
2213 lf(vc);
2214 return;
2215 case 'M':
2216 ri(vc);
2217 return;
2218 case 'D':
2219 lf(vc);
2220 return;
2221 case 'H':
2222 if (vc->state.x < VC_TABSTOPS_COUNT)
2223 set_bit(vc->state.x, vc->vc_tab_stop);
2224 return;
2225 case 'Z':
2226 respond_ID(tty);
2227 return;
2228 case '7':
2229 save_cur(vc);
2230 return;
2231 case '8':
2232 restore_cur(vc);
2233 return;
2234 case '(':
2235 vc->vc_state = ESsetG0;
2236 return;
2237 case ')':
2238 vc->vc_state = ESsetG1;
2239 return;
2240 case '#':
2241 vc->vc_state = EShash;
2242 return;
2243 case 'c':
2244 reset_terminal(vc, 1);
2245 return;
2246 case '>': /* Numeric keypad */
2247 clr_kbd(vc, kbdapplic);
2248 return;
2249 case '=': /* Appl. keypad */
2250 set_kbd(vc, kbdapplic);
2251 return;
2252 }
2253 return;
2254 case ESnonstd:
2255 if (c=='P') { /* palette escape sequence */
2256 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2257 vc->vc_par[vc->vc_npar] = 0;
2258 vc->vc_npar = 0;
2259 vc->vc_state = ESpalette;
2260 return;
2261 } else if (c=='R') { /* reset palette */
2262 reset_palette(vc);
2263 vc->vc_state = ESnormal;
2264 } else if (c>='0' && c<='9')
2265 vc->vc_state = ESosc;
2266 else
2267 vc->vc_state = ESnormal;
2268 return;
2269 case ESpalette:
2270 if (isxdigit(c)) {
2271 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2272 if (vc->vc_npar == 7) {
2273 int i = vc->vc_par[0] * 3, j = 1;
2274 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2275 vc->vc_palette[i++] += vc->vc_par[j++];
2276 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2277 vc->vc_palette[i++] += vc->vc_par[j++];
2278 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2279 vc->vc_palette[i] += vc->vc_par[j];
2280 set_palette(vc);
2281 vc->vc_state = ESnormal;
2282 }
2283 } else
2284 vc->vc_state = ESnormal;
2285 return;
2286 case ESsquare:
2287 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2288 vc->vc_par[vc->vc_npar] = 0;
2289 vc->vc_npar = 0;
2290 vc->vc_state = ESgetpars;
2291 if (c == '[') { /* Function key */
2292 vc->vc_state=ESfunckey;
2293 return;
2294 }
2295 switch (c) {
2296 case '?':
2297 vc->vc_priv = EPdec;
2298 return;
2299 case '>':
2300 vc->vc_priv = EPgt;
2301 return;
2302 case '=':
2303 vc->vc_priv = EPeq;
2304 return;
2305 case '<':
2306 vc->vc_priv = EPlt;
2307 return;
2308 }
2309 vc->vc_priv = EPecma;
2310 fallthrough;
2311 case ESgetpars:
2312 if (c == ';' && vc->vc_npar < NPAR - 1) {
2313 vc->vc_npar++;
2314 return;
2315 } else if (c>='0' && c<='9') {
2316 vc->vc_par[vc->vc_npar] *= 10;
2317 vc->vc_par[vc->vc_npar] += c - '0';
2318 return;
2319 }
2320 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2321 vc->vc_state = EScsiignore;
2322 return;
2323 }
2324 vc->vc_state = ESnormal;
2325 switch(c) {
2326 case 'h':
2327 if (vc->vc_priv <= EPdec)
2328 set_mode(vc, 1);
2329 return;
2330 case 'l':
2331 if (vc->vc_priv <= EPdec)
2332 set_mode(vc, 0);
2333 return;
2334 case 'c':
2335 if (vc->vc_priv == EPdec) {
2336 if (vc->vc_par[0])
2337 vc->vc_cursor_type =
2338 CUR_MAKE(vc->vc_par[0],
2339 vc->vc_par[1],
2340 vc->vc_par[2]);
2341 else
2342 vc->vc_cursor_type = cur_default;
2343 return;
2344 }
2345 break;
2346 case 'm':
2347 if (vc->vc_priv == EPdec) {
2348 clear_selection();
2349 if (vc->vc_par[0])
2350 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2351 else
2352 vc->vc_complement_mask = vc->vc_s_complement_mask;
2353 return;
2354 }
2355 break;
2356 case 'n':
2357 if (vc->vc_priv == EPecma) {
2358 if (vc->vc_par[0] == 5)
2359 status_report(tty);
2360 else if (vc->vc_par[0] == 6)
2361 cursor_report(vc, tty);
2362 }
2363 return;
2364 }
2365 if (vc->vc_priv != EPecma) {
2366 vc->vc_priv = EPecma;
2367 return;
2368 }
2369 switch(c) {
2370 case 'G': case '`':
2371 if (vc->vc_par[0])
2372 vc->vc_par[0]--;
2373 gotoxy(vc, vc->vc_par[0], vc->state.y);
2374 return;
2375 case 'A':
2376 if (!vc->vc_par[0])
2377 vc->vc_par[0]++;
2378 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
2379 return;
2380 case 'B': case 'e':
2381 if (!vc->vc_par[0])
2382 vc->vc_par[0]++;
2383 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
2384 return;
2385 case 'C': case 'a':
2386 if (!vc->vc_par[0])
2387 vc->vc_par[0]++;
2388 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
2389 return;
2390 case 'D':
2391 if (!vc->vc_par[0])
2392 vc->vc_par[0]++;
2393 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
2394 return;
2395 case 'E':
2396 if (!vc->vc_par[0])
2397 vc->vc_par[0]++;
2398 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
2399 return;
2400 case 'F':
2401 if (!vc->vc_par[0])
2402 vc->vc_par[0]++;
2403 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
2404 return;
2405 case 'd':
2406 if (vc->vc_par[0])
2407 vc->vc_par[0]--;
2408 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
2409 return;
2410 case 'H': case 'f':
2411 if (vc->vc_par[0])
2412 vc->vc_par[0]--;
2413 if (vc->vc_par[1])
2414 vc->vc_par[1]--;
2415 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2416 return;
2417 case 'J':
2418 csi_J(vc, vc->vc_par[0]);
2419 return;
2420 case 'K':
2421 csi_K(vc, vc->vc_par[0]);
2422 return;
2423 case 'L':
2424 csi_L(vc, vc->vc_par[0]);
2425 return;
2426 case 'M':
2427 csi_M(vc, vc->vc_par[0]);
2428 return;
2429 case 'P':
2430 csi_P(vc, vc->vc_par[0]);
2431 return;
2432 case 'c':
2433 if (!vc->vc_par[0])
2434 respond_ID(tty);
2435 return;
2436 case 'g':
2437 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2438 set_bit(vc->state.x, vc->vc_tab_stop);
2439 else if (vc->vc_par[0] == 3)
2440 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2441 return;
2442 case 'm':
2443 csi_m(vc);
2444 return;
2445 case 'q': /* DECLL - but only 3 leds */
2446 /* map 0,1,2,3 to 0,1,2,4 */
2447 if (vc->vc_par[0] < 4)
2448 vt_set_led_state(vc->vc_num,
2449 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2450 return;
2451 case 'r':
2452 if (!vc->vc_par[0])
2453 vc->vc_par[0]++;
2454 if (!vc->vc_par[1])
2455 vc->vc_par[1] = vc->vc_rows;
2456 /* Minimum allowed region is 2 lines */
2457 if (vc->vc_par[0] < vc->vc_par[1] &&
2458 vc->vc_par[1] <= vc->vc_rows) {
2459 vc->vc_top = vc->vc_par[0] - 1;
2460 vc->vc_bottom = vc->vc_par[1];
2461 gotoxay(vc, 0, 0);
2462 }
2463 return;
2464 case 's':
2465 save_cur(vc);
2466 return;
2467 case 'u':
2468 restore_cur(vc);
2469 return;
2470 case 'X':
2471 csi_X(vc, vc->vc_par[0]);
2472 return;
2473 case '@':
2474 csi_at(vc, vc->vc_par[0]);
2475 return;
2476 case ']': /* setterm functions */
2477 setterm_command(vc);
2478 return;
2479 }
2480 return;
2481 case EScsiignore:
2482 if (c >= 20 && c <= 0x3f)
2483 return;
2484 vc->vc_state = ESnormal;
2485 return;
2486 case ESpercent:
2487 vc->vc_state = ESnormal;
2488 switch (c) {
2489 case '@': /* defined in ISO 2022 */
2490 vc->vc_utf = 0;
2491 return;
2492 case 'G': /* prelim official escape code */
2493 case '8': /* retained for compatibility */
2494 vc->vc_utf = 1;
2495 return;
2496 }
2497 return;
2498 case ESfunckey:
2499 vc->vc_state = ESnormal;
2500 return;
2501 case EShash:
2502 vc->vc_state = ESnormal;
2503 if (c == '8') {
2504 /* DEC screen alignment test. kludge :-) */
2505 vc->vc_video_erase_char =
2506 (vc->vc_video_erase_char & 0xff00) | 'E';
2507 csi_J(vc, 2);
2508 vc->vc_video_erase_char =
2509 (vc->vc_video_erase_char & 0xff00) | ' ';
2510 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2511 }
2512 return;
2513 case ESsetG0:
2514 vc_setGx(vc, 0, c);
2515 vc->vc_state = ESnormal;
2516 return;
2517 case ESsetG1:
2518 vc_setGx(vc, 1, c);
2519 vc->vc_state = ESnormal;
2520 return;
2521 case ESosc:
2522 return;
2523 default:
2524 vc->vc_state = ESnormal;
2525 }
2526}
2527
2528/* is_double_width() is based on the wcwidth() implementation by
2529 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2530 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2531 */
2532struct interval {
2533 uint32_t first;
2534 uint32_t last;
2535};
2536
2537static int ucs_cmp(const void *key, const void *elt)
2538{
2539 uint32_t ucs = *(uint32_t *)key;
2540 struct interval e = *(struct interval *) elt;
2541
2542 if (ucs > e.last)
2543 return 1;
2544 else if (ucs < e.first)
2545 return -1;
2546 return 0;
2547}
2548
2549static int is_double_width(uint32_t ucs)
2550{
2551 static const struct interval double_width[] = {
2552 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2553 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2554 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2555 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2556 };
2557 if (ucs < double_width[0].first ||
2558 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2559 return 0;
2560
2561 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2562 sizeof(struct interval), ucs_cmp) != NULL;
2563}
2564
2565struct vc_draw_region {
2566 unsigned long from, to;
2567 int x;
2568};
2569
2570static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2571{
2572 if (draw->x < 0)
2573 return;
2574
2575 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2576 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2577 draw->x);
2578 draw->x = -1;
2579}
2580
2581static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2582{
2583 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2584 if (vc->vc_toggle_meta)
2585 c |= 0x80;
2586
2587 return vc->vc_translate[c];
2588 }
2589
2590 return c;
2591}
2592
2593
2594/**
2595 * vc_sanitize_unicode -- Replace invalid Unicode code points with U+FFFD
2596 * @c: the received character, or U+FFFD for invalid sequences.
2597 */
2598static inline int vc_sanitize_unicode(const int c)
2599{
2600 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2601 return 0xfffd;
2602
2603 return c;
2604}
2605
2606/**
2607 * vc_translate_unicode -- Combine UTF-8 into Unicode in @vc_utf_char
2608 *
2609 * @vc_utf_char is the being-constructed unicode character.
2610 * @vc_utf_count is the number of continuation bytes still expected to arrive.
2611 * @vc_npar is the number of continuation bytes arrived so far.
2612 */
2613static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2614{
2615 static const u32 utf8_length_changes[] = {
2616 0x0000007f, 0x000007ff, 0x0000ffff,
2617 0x001fffff, 0x03ffffff, 0x7fffffff
2618 };
2619
2620 /* Continuation byte received */
2621 if ((c & 0xc0) == 0x80) {
2622 /* Unexpected continuation byte? */
2623 if (!vc->vc_utf_count)
2624 return 0xfffd;
2625
2626 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2627 vc->vc_npar++;
2628 if (--vc->vc_utf_count)
2629 goto need_more_bytes;
2630
2631 /* Got a whole character */
2632 c = vc->vc_utf_char;
2633 /* Reject overlong sequences */
2634 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2635 c > utf8_length_changes[vc->vc_npar])
2636 return 0xfffd;
2637
2638 return vc_sanitize_unicode(c);
2639 }
2640
2641 /* Single ASCII byte or first byte of a sequence received */
2642 if (vc->vc_utf_count) {
2643 /* Continuation byte expected */
2644 *rescan = true;
2645 vc->vc_utf_count = 0;
2646 return 0xfffd;
2647 }
2648
2649 /* Nothing to do if an ASCII byte was received */
2650 if (c <= 0x7f)
2651 return c;
2652
2653 /* First byte of a multibyte sequence received */
2654 vc->vc_npar = 0;
2655 if ((c & 0xe0) == 0xc0) {
2656 vc->vc_utf_count = 1;
2657 vc->vc_utf_char = (c & 0x1f);
2658 } else if ((c & 0xf0) == 0xe0) {
2659 vc->vc_utf_count = 2;
2660 vc->vc_utf_char = (c & 0x0f);
2661 } else if ((c & 0xf8) == 0xf0) {
2662 vc->vc_utf_count = 3;
2663 vc->vc_utf_char = (c & 0x07);
2664 } else if ((c & 0xfc) == 0xf8) {
2665 vc->vc_utf_count = 4;
2666 vc->vc_utf_char = (c & 0x03);
2667 } else if ((c & 0xfe) == 0xfc) {
2668 vc->vc_utf_count = 5;
2669 vc->vc_utf_char = (c & 0x01);
2670 } else {
2671 /* 254 and 255 are invalid */
2672 return 0xfffd;
2673 }
2674
2675need_more_bytes:
2676 return -1;
2677}
2678
2679static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2680{
2681 /* Do no translation at all in control states */
2682 if (vc->vc_state != ESnormal)
2683 return *c;
2684
2685 if (vc->vc_utf && !vc->vc_disp_ctrl)
2686 return *c = vc_translate_unicode(vc, *c, rescan);
2687
2688 /* no utf or alternate charset mode */
2689 return vc_translate_ascii(vc, *c);
2690}
2691
2692static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2693{
2694 if (!vc->vc_can_do_color)
2695 return vc->vc_attr ^ 0x08;
2696
2697 if (vc->vc_hi_font_mask == 0x100)
2698 return (vc->vc_attr & 0x11) |
2699 ((vc->vc_attr & 0xe0) >> 4) |
2700 ((vc->vc_attr & 0x0e) << 4);
2701
2702 return (vc->vc_attr & 0x88) |
2703 ((vc->vc_attr & 0x70) >> 4) |
2704 ((vc->vc_attr & 0x07) << 4);
2705}
2706
2707static bool vc_is_control(struct vc_data *vc, int tc, int c)
2708{
2709 /*
2710 * A bitmap for codes <32. A bit of 1 indicates that the code
2711 * corresponding to that bit number invokes some special action (such
2712 * as cursor movement) and should not be displayed as a glyph unless
2713 * the disp_ctrl mode is explicitly enabled.
2714 */
2715 static const u32 CTRL_ACTION = 0x0d00ff81;
2716 /* Cannot be overridden by disp_ctrl */
2717 static const u32 CTRL_ALWAYS = 0x0800f501;
2718
2719 if (vc->vc_state != ESnormal)
2720 return true;
2721
2722 if (!tc)
2723 return true;
2724
2725 /*
2726 * If the original code was a control character we only allow a glyph
2727 * to be displayed if the code is not normally used (such as for cursor
2728 * movement) or if the disp_ctrl mode has been explicitly enabled.
2729 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2730 * displayed as control characters, as the console would be pretty
2731 * useless without them; to display an arbitrary font position use the
2732 * direct-to-font zone in UTF-8 mode.
2733 */
2734 if (c < 32) {
2735 if (vc->vc_disp_ctrl)
2736 return CTRL_ALWAYS & BIT(c);
2737 else
2738 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2739 }
2740
2741 if (c == 127 && !vc->vc_disp_ctrl)
2742 return true;
2743
2744 if (c == 128 + 27)
2745 return true;
2746
2747 return false;
2748}
2749
2750static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2751 struct vc_draw_region *draw)
2752{
2753 int next_c;
2754 unsigned char vc_attr = vc->vc_attr;
2755 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2756 u8 width = 1;
2757 bool inverse = false;
2758
2759 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2760 if (is_double_width(c))
2761 width = 2;
2762 }
2763
2764 /* Now try to find out how to display it */
2765 tc = conv_uni_to_pc(vc, tc);
2766 if (tc & ~charmask) {
2767 if (tc == -1 || tc == -2)
2768 return -1; /* nothing to display */
2769
2770 /* Glyph not found */
2771 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
2772 !(c & ~charmask)) {
2773 /*
2774 * In legacy mode use the glyph we get by a 1:1
2775 * mapping.
2776 * This would make absolutely no sense with Unicode in
2777 * mind, but do this for ASCII characters since a font
2778 * may lack Unicode mapping info and we don't want to
2779 * end up with having question marks only.
2780 */
2781 tc = c;
2782 } else {
2783 /*
2784 * Display U+FFFD. If it's not found, display an inverse
2785 * question mark.
2786 */
2787 tc = conv_uni_to_pc(vc, 0xfffd);
2788 if (tc < 0) {
2789 inverse = true;
2790 tc = conv_uni_to_pc(vc, '?');
2791 if (tc < 0)
2792 tc = '?';
2793
2794 vc_attr = vc_invert_attr(vc);
2795 con_flush(vc, draw);
2796 }
2797 }
2798 }
2799
2800 next_c = c;
2801 while (1) {
2802 if (vc->vc_need_wrap || vc->vc_decim)
2803 con_flush(vc, draw);
2804 if (vc->vc_need_wrap) {
2805 cr(vc);
2806 lf(vc);
2807 }
2808 if (vc->vc_decim)
2809 insert_char(vc, 1);
2810 vc_uniscr_putc(vc, next_c);
2811
2812 if (himask)
2813 tc = ((tc & 0x100) ? himask : 0) |
2814 (tc & 0xff);
2815 tc |= (vc_attr << 8) & ~himask;
2816
2817 scr_writew(tc, (u16 *)vc->vc_pos);
2818
2819 if (con_should_update(vc) && draw->x < 0) {
2820 draw->x = vc->state.x;
2821 draw->from = vc->vc_pos;
2822 }
2823 if (vc->state.x == vc->vc_cols - 1) {
2824 vc->vc_need_wrap = vc->vc_decawm;
2825 draw->to = vc->vc_pos + 2;
2826 } else {
2827 vc->state.x++;
2828 draw->to = (vc->vc_pos += 2);
2829 }
2830
2831 if (!--width)
2832 break;
2833
2834 /* A space is printed in the second column */
2835 tc = conv_uni_to_pc(vc, ' ');
2836 if (tc < 0)
2837 tc = ' ';
2838 next_c = ' ';
2839 }
2840 notify_write(vc, c);
2841
2842 if (inverse)
2843 con_flush(vc, draw);
2844
2845 return 0;
2846}
2847
2848/* acquires console_lock */
2849static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2850{
2851 struct vc_draw_region draw = {
2852 .x = -1,
2853 };
2854 int c, tc, n = 0;
2855 unsigned int currcons;
2856 struct vc_data *vc;
2857 struct vt_notifier_param param;
2858 bool rescan;
2859
2860 if (in_interrupt())
2861 return count;
2862
2863 console_lock();
2864 vc = tty->driver_data;
2865 if (vc == NULL) {
2866 pr_err("vt: argh, driver_data is NULL !\n");
2867 console_unlock();
2868 return 0;
2869 }
2870
2871 currcons = vc->vc_num;
2872 if (!vc_cons_allocated(currcons)) {
2873 /* could this happen? */
2874 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2875 console_unlock();
2876 return 0;
2877 }
2878
2879
2880 /* undraw cursor first */
2881 if (con_is_fg(vc))
2882 hide_cursor(vc);
2883
2884 param.vc = vc;
2885
2886 while (!tty->stopped && count) {
2887 int orig = *buf;
2888 buf++;
2889 n++;
2890 count--;
2891rescan_last_byte:
2892 c = orig;
2893 rescan = false;
2894
2895 tc = vc_translate(vc, &c, &rescan);
2896 if (tc == -1)
2897 continue;
2898
2899 param.c = tc;
2900 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2901 ¶m) == NOTIFY_STOP)
2902 continue;
2903
2904 if (vc_is_control(vc, tc, c)) {
2905 con_flush(vc, &draw);
2906 do_con_trol(tty, vc, orig);
2907 continue;
2908 }
2909
2910 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
2911 continue;
2912
2913 if (rescan)
2914 goto rescan_last_byte;
2915 }
2916 con_flush(vc, &draw);
2917 vc_uniscr_debug_check(vc);
2918 console_conditional_schedule();
2919 notify_update(vc);
2920 console_unlock();
2921 return n;
2922}
2923
2924/*
2925 * This is the console switching callback.
2926 *
2927 * Doing console switching in a process context allows
2928 * us to do the switches asynchronously (needed when we want
2929 * to switch due to a keyboard interrupt). Synchronization
2930 * with other console code and prevention of re-entrancy is
2931 * ensured with console_lock.
2932 */
2933static void console_callback(struct work_struct *ignored)
2934{
2935 console_lock();
2936
2937 if (want_console >= 0) {
2938 if (want_console != fg_console &&
2939 vc_cons_allocated(want_console)) {
2940 hide_cursor(vc_cons[fg_console].d);
2941 change_console(vc_cons[want_console].d);
2942 /* we only changed when the console had already
2943 been allocated - a new console is not created
2944 in an interrupt routine */
2945 }
2946 want_console = -1;
2947 }
2948 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2949 do_poke_blanked_console = 0;
2950 poke_blanked_console();
2951 }
2952 if (scrollback_delta) {
2953 struct vc_data *vc = vc_cons[fg_console].d;
2954 clear_selection();
2955 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2956 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2957 scrollback_delta = 0;
2958 }
2959 if (blank_timer_expired) {
2960 do_blank_screen(0);
2961 blank_timer_expired = 0;
2962 }
2963 notify_update(vc_cons[fg_console].d);
2964
2965 console_unlock();
2966}
2967
2968int set_console(int nr)
2969{
2970 struct vc_data *vc = vc_cons[fg_console].d;
2971
2972 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2973 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2974
2975 /*
2976 * Console switch will fail in console_callback() or
2977 * change_console() so there is no point scheduling
2978 * the callback
2979 *
2980 * Existing set_console() users don't check the return
2981 * value so this shouldn't break anything
2982 */
2983 return -EINVAL;
2984 }
2985
2986 want_console = nr;
2987 schedule_console_callback();
2988
2989 return 0;
2990}
2991
2992struct tty_driver *console_driver;
2993
2994#ifdef CONFIG_VT_CONSOLE
2995
2996/**
2997 * vt_kmsg_redirect() - Sets/gets the kernel message console
2998 * @new: The new virtual terminal number or -1 if the console should stay
2999 * unchanged
3000 *
3001 * By default, the kernel messages are always printed on the current virtual
3002 * console. However, the user may modify that default with the
3003 * TIOCL_SETKMSGREDIRECT ioctl call.
3004 *
3005 * This function sets the kernel message console to be @new. It returns the old
3006 * virtual console number. The virtual terminal number 0 (both as parameter and
3007 * return value) means no redirection (i.e. always printed on the currently
3008 * active console).
3009 *
3010 * The parameter -1 means that only the current console is returned, but the
3011 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3012 * case to make the code more understandable.
3013 *
3014 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
3015 * the parameter and always returns 0.
3016 */
3017int vt_kmsg_redirect(int new)
3018{
3019 static int kmsg_con;
3020
3021 if (new != -1)
3022 return xchg(&kmsg_con, new);
3023 else
3024 return kmsg_con;
3025}
3026
3027/*
3028 * Console on virtual terminal
3029 *
3030 * The console must be locked when we get here.
3031 */
3032
3033static void vt_console_print(struct console *co, const char *b, unsigned count)
3034{
3035 struct vc_data *vc = vc_cons[fg_console].d;
3036 unsigned char c;
3037 static DEFINE_SPINLOCK(printing_lock);
3038 const ushort *start;
3039 ushort start_x, cnt;
3040 int kmsg_console;
3041
3042 /* console busy or not yet initialized */
3043 if (!printable)
3044 return;
3045 if (!spin_trylock(&printing_lock))
3046 return;
3047
3048 kmsg_console = vt_get_kmsg_redirect();
3049 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3050 vc = vc_cons[kmsg_console - 1].d;
3051
3052 if (!vc_cons_allocated(fg_console)) {
3053 /* impossible */
3054 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3055 goto quit;
3056 }
3057
3058 if (vc->vc_mode != KD_TEXT)
3059 goto quit;
3060
3061 /* undraw cursor first */
3062 if (con_is_fg(vc))
3063 hide_cursor(vc);
3064
3065 start = (ushort *)vc->vc_pos;
3066 start_x = vc->state.x;
3067 cnt = 0;
3068 while (count--) {
3069 c = *b++;
3070 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
3071 if (cnt && con_is_visible(vc))
3072 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3073 cnt = 0;
3074 if (c == 8) { /* backspace */
3075 bs(vc);
3076 start = (ushort *)vc->vc_pos;
3077 start_x = vc->state.x;
3078 continue;
3079 }
3080 if (c != 13)
3081 lf(vc);
3082 cr(vc);
3083 start = (ushort *)vc->vc_pos;
3084 start_x = vc->state.x;
3085 if (c == 10 || c == 13)
3086 continue;
3087 }
3088 vc_uniscr_putc(vc, c);
3089 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3090 notify_write(vc, c);
3091 cnt++;
3092 if (vc->state.x == vc->vc_cols - 1) {
3093 vc->vc_need_wrap = 1;
3094 } else {
3095 vc->vc_pos += 2;
3096 vc->state.x++;
3097 }
3098 }
3099 if (cnt && con_is_visible(vc))
3100 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3101 set_cursor(vc);
3102 notify_update(vc);
3103
3104quit:
3105 spin_unlock(&printing_lock);
3106}
3107
3108static struct tty_driver *vt_console_device(struct console *c, int *index)
3109{
3110 *index = c->index ? c->index-1 : fg_console;
3111 return console_driver;
3112}
3113
3114static struct console vt_console_driver = {
3115 .name = "tty",
3116 .write = vt_console_print,
3117 .device = vt_console_device,
3118 .unblank = unblank_screen,
3119 .flags = CON_PRINTBUFFER,
3120 .index = -1,
3121};
3122#endif
3123
3124/*
3125 * Handling of Linux-specific VC ioctls
3126 */
3127
3128/*
3129 * Generally a bit racy with respect to console_lock();.
3130 *
3131 * There are some functions which don't need it.
3132 *
3133 * There are some functions which can sleep for arbitrary periods
3134 * (paste_selection) but we don't need the lock there anyway.
3135 *
3136 * set_selection_user has locking, and definitely needs it
3137 */
3138
3139int tioclinux(struct tty_struct *tty, unsigned long arg)
3140{
3141 char type, data;
3142 char __user *p = (char __user *)arg;
3143 int lines;
3144 int ret;
3145
3146 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3147 return -EPERM;
3148 if (get_user(type, p))
3149 return -EFAULT;
3150 ret = 0;
3151
3152 switch (type)
3153 {
3154 case TIOCL_SETSEL:
3155 ret = set_selection_user((struct tiocl_selection
3156 __user *)(p+1), tty);
3157 break;
3158 case TIOCL_PASTESEL:
3159 ret = paste_selection(tty);
3160 break;
3161 case TIOCL_UNBLANKSCREEN:
3162 console_lock();
3163 unblank_screen();
3164 console_unlock();
3165 break;
3166 case TIOCL_SELLOADLUT:
3167 console_lock();
3168 ret = sel_loadlut(p);
3169 console_unlock();
3170 break;
3171 case TIOCL_GETSHIFTSTATE:
3172
3173 /*
3174 * Make it possible to react to Shift+Mousebutton.
3175 * Note that 'shift_state' is an undocumented
3176 * kernel-internal variable; programs not closely
3177 * related to the kernel should not use this.
3178 */
3179 data = vt_get_shift_state();
3180 ret = put_user(data, p);
3181 break;
3182 case TIOCL_GETMOUSEREPORTING:
3183 console_lock(); /* May be overkill */
3184 data = mouse_reporting();
3185 console_unlock();
3186 ret = put_user(data, p);
3187 break;
3188 case TIOCL_SETVESABLANK:
3189 console_lock();
3190 ret = set_vesa_blanking(p);
3191 console_unlock();
3192 break;
3193 case TIOCL_GETKMSGREDIRECT:
3194 data = vt_get_kmsg_redirect();
3195 ret = put_user(data, p);
3196 break;
3197 case TIOCL_SETKMSGREDIRECT:
3198 if (!capable(CAP_SYS_ADMIN)) {
3199 ret = -EPERM;
3200 } else {
3201 if (get_user(data, p+1))
3202 ret = -EFAULT;
3203 else
3204 vt_kmsg_redirect(data);
3205 }
3206 break;
3207 case TIOCL_GETFGCONSOLE:
3208 /* No locking needed as this is a transiently
3209 correct return anyway if the caller hasn't
3210 disabled switching */
3211 ret = fg_console;
3212 break;
3213 case TIOCL_SCROLLCONSOLE:
3214 if (get_user(lines, (s32 __user *)(p+4))) {
3215 ret = -EFAULT;
3216 } else {
3217 /* Need the console lock here. Note that lots
3218 of other calls need fixing before the lock
3219 is actually useful ! */
3220 console_lock();
3221 scrollfront(vc_cons[fg_console].d, lines);
3222 console_unlock();
3223 ret = 0;
3224 }
3225 break;
3226 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3227 console_lock();
3228 ignore_poke = 1;
3229 do_blank_screen(0);
3230 console_unlock();
3231 break;
3232 case TIOCL_BLANKEDSCREEN:
3233 ret = console_blanked;
3234 break;
3235 default:
3236 ret = -EINVAL;
3237 break;
3238 }
3239 return ret;
3240}
3241
3242/*
3243 * /dev/ttyN handling
3244 */
3245
3246static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3247{
3248 int retval;
3249
3250 retval = do_con_write(tty, buf, count);
3251 con_flush_chars(tty);
3252
3253 return retval;
3254}
3255
3256static int con_put_char(struct tty_struct *tty, unsigned char ch)
3257{
3258 if (in_interrupt())
3259 return 0; /* n_r3964 calls put_char() from interrupt context */
3260 return do_con_write(tty, &ch, 1);
3261}
3262
3263static int con_write_room(struct tty_struct *tty)
3264{
3265 if (tty->stopped)
3266 return 0;
3267 return 32768; /* No limit, really; we're not buffering */
3268}
3269
3270static int con_chars_in_buffer(struct tty_struct *tty)
3271{
3272 return 0; /* we're not buffering */
3273}
3274
3275/*
3276 * con_throttle and con_unthrottle are only used for
3277 * paste_selection(), which has to stuff in a large number of
3278 * characters...
3279 */
3280static void con_throttle(struct tty_struct *tty)
3281{
3282}
3283
3284static void con_unthrottle(struct tty_struct *tty)
3285{
3286 struct vc_data *vc = tty->driver_data;
3287
3288 wake_up_interruptible(&vc->paste_wait);
3289}
3290
3291/*
3292 * Turn the Scroll-Lock LED on when the tty is stopped
3293 */
3294static void con_stop(struct tty_struct *tty)
3295{
3296 int console_num;
3297 if (!tty)
3298 return;
3299 console_num = tty->index;
3300 if (!vc_cons_allocated(console_num))
3301 return;
3302 vt_kbd_con_stop(console_num);
3303}
3304
3305/*
3306 * Turn the Scroll-Lock LED off when the console is started
3307 */
3308static void con_start(struct tty_struct *tty)
3309{
3310 int console_num;
3311 if (!tty)
3312 return;
3313 console_num = tty->index;
3314 if (!vc_cons_allocated(console_num))
3315 return;
3316 vt_kbd_con_start(console_num);
3317}
3318
3319static void con_flush_chars(struct tty_struct *tty)
3320{
3321 struct vc_data *vc;
3322
3323 if (in_interrupt()) /* from flush_to_ldisc */
3324 return;
3325
3326 /* if we race with con_close(), vt may be null */
3327 console_lock();
3328 vc = tty->driver_data;
3329 if (vc)
3330 set_cursor(vc);
3331 console_unlock();
3332}
3333
3334/*
3335 * Allocate the console screen memory.
3336 */
3337static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3338{
3339 unsigned int currcons = tty->index;
3340 struct vc_data *vc;
3341 int ret;
3342
3343 console_lock();
3344 ret = vc_allocate(currcons);
3345 if (ret)
3346 goto unlock;
3347
3348 vc = vc_cons[currcons].d;
3349
3350 /* Still being freed */
3351 if (vc->port.tty) {
3352 ret = -ERESTARTSYS;
3353 goto unlock;
3354 }
3355
3356 ret = tty_port_install(&vc->port, driver, tty);
3357 if (ret)
3358 goto unlock;
3359
3360 tty->driver_data = vc;
3361 vc->port.tty = tty;
3362 tty_port_get(&vc->port);
3363
3364 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3365 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3366 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3367 }
3368 if (vc->vc_utf)
3369 tty->termios.c_iflag |= IUTF8;
3370 else
3371 tty->termios.c_iflag &= ~IUTF8;
3372unlock:
3373 console_unlock();
3374 return ret;
3375}
3376
3377static int con_open(struct tty_struct *tty, struct file *filp)
3378{
3379 /* everything done in install */
3380 return 0;
3381}
3382
3383
3384static void con_close(struct tty_struct *tty, struct file *filp)
3385{
3386 /* Nothing to do - we defer to shutdown */
3387}
3388
3389static void con_shutdown(struct tty_struct *tty)
3390{
3391 struct vc_data *vc = tty->driver_data;
3392 BUG_ON(vc == NULL);
3393 console_lock();
3394 vc->port.tty = NULL;
3395 console_unlock();
3396}
3397
3398static void con_cleanup(struct tty_struct *tty)
3399{
3400 struct vc_data *vc = tty->driver_data;
3401
3402 tty_port_put(&vc->port);
3403}
3404
3405static int default_color = 7; /* white */
3406static int default_italic_color = 2; // green (ASCII)
3407static int default_underline_color = 3; // cyan (ASCII)
3408module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3409module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3410module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3411
3412static void vc_init(struct vc_data *vc, unsigned int rows,
3413 unsigned int cols, int do_clear)
3414{
3415 int j, k ;
3416
3417 vc->vc_cols = cols;
3418 vc->vc_rows = rows;
3419 vc->vc_size_row = cols << 1;
3420 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3421
3422 set_origin(vc);
3423 vc->vc_pos = vc->vc_origin;
3424 reset_vc(vc);
3425 for (j=k=0; j<16; j++) {
3426 vc->vc_palette[k++] = default_red[j] ;
3427 vc->vc_palette[k++] = default_grn[j] ;
3428 vc->vc_palette[k++] = default_blu[j] ;
3429 }
3430 vc->vc_def_color = default_color;
3431 vc->vc_ulcolor = default_underline_color;
3432 vc->vc_itcolor = default_italic_color;
3433 vc->vc_halfcolor = 0x08; /* grey */
3434 init_waitqueue_head(&vc->paste_wait);
3435 reset_terminal(vc, do_clear);
3436}
3437
3438/*
3439 * This routine initializes console interrupts, and does nothing
3440 * else. If you want the screen to clear, call tty_write with
3441 * the appropriate escape-sequence.
3442 */
3443
3444static int __init con_init(void)
3445{
3446 const char *display_desc = NULL;
3447 struct vc_data *vc;
3448 unsigned int currcons = 0, i;
3449
3450 console_lock();
3451
3452 if (!conswitchp)
3453 conswitchp = &dummy_con;
3454 display_desc = conswitchp->con_startup();
3455 if (!display_desc) {
3456 fg_console = 0;
3457 console_unlock();
3458 return 0;
3459 }
3460
3461 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3462 struct con_driver *con_driver = ®istered_con_driver[i];
3463
3464 if (con_driver->con == NULL) {
3465 con_driver->con = conswitchp;
3466 con_driver->desc = display_desc;
3467 con_driver->flag = CON_DRIVER_FLAG_INIT;
3468 con_driver->first = 0;
3469 con_driver->last = MAX_NR_CONSOLES - 1;
3470 break;
3471 }
3472 }
3473
3474 for (i = 0; i < MAX_NR_CONSOLES; i++)
3475 con_driver_map[i] = conswitchp;
3476
3477 if (blankinterval) {
3478 blank_state = blank_normal_wait;
3479 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3480 }
3481
3482 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3483 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3484 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3485 tty_port_init(&vc->port);
3486 visual_init(vc, currcons, 1);
3487 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3488 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3489 vc_init(vc, vc->vc_rows, vc->vc_cols,
3490 currcons || !vc->vc_sw->con_save_screen);
3491 }
3492 currcons = fg_console = 0;
3493 master_display_fg = vc = vc_cons[currcons].d;
3494 set_origin(vc);
3495 save_screen(vc);
3496 gotoxy(vc, vc->state.x, vc->state.y);
3497 csi_J(vc, 0);
3498 update_screen(vc);
3499 pr_info("Console: %s %s %dx%d\n",
3500 vc->vc_can_do_color ? "colour" : "mono",
3501 display_desc, vc->vc_cols, vc->vc_rows);
3502 printable = 1;
3503
3504 console_unlock();
3505
3506#ifdef CONFIG_VT_CONSOLE
3507 register_console(&vt_console_driver);
3508#endif
3509 return 0;
3510}
3511console_initcall(con_init);
3512
3513static const struct tty_operations con_ops = {
3514 .install = con_install,
3515 .open = con_open,
3516 .close = con_close,
3517 .write = con_write,
3518 .write_room = con_write_room,
3519 .put_char = con_put_char,
3520 .flush_chars = con_flush_chars,
3521 .chars_in_buffer = con_chars_in_buffer,
3522 .ioctl = vt_ioctl,
3523#ifdef CONFIG_COMPAT
3524 .compat_ioctl = vt_compat_ioctl,
3525#endif
3526 .stop = con_stop,
3527 .start = con_start,
3528 .throttle = con_throttle,
3529 .unthrottle = con_unthrottle,
3530 .resize = vt_resize,
3531 .shutdown = con_shutdown,
3532 .cleanup = con_cleanup,
3533};
3534
3535static struct cdev vc0_cdev;
3536
3537static ssize_t show_tty_active(struct device *dev,
3538 struct device_attribute *attr, char *buf)
3539{
3540 return sprintf(buf, "tty%d\n", fg_console + 1);
3541}
3542static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3543
3544static struct attribute *vt_dev_attrs[] = {
3545 &dev_attr_active.attr,
3546 NULL
3547};
3548
3549ATTRIBUTE_GROUPS(vt_dev);
3550
3551int __init vty_init(const struct file_operations *console_fops)
3552{
3553 cdev_init(&vc0_cdev, console_fops);
3554 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3555 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3556 panic("Couldn't register /dev/tty0 driver\n");
3557 tty0dev = device_create_with_groups(tty_class, NULL,
3558 MKDEV(TTY_MAJOR, 0), NULL,
3559 vt_dev_groups, "tty0");
3560 if (IS_ERR(tty0dev))
3561 tty0dev = NULL;
3562
3563 vcs_init();
3564
3565 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3566 if (!console_driver)
3567 panic("Couldn't allocate console driver\n");
3568
3569 console_driver->name = "tty";
3570 console_driver->name_base = 1;
3571 console_driver->major = TTY_MAJOR;
3572 console_driver->minor_start = 1;
3573 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3574 console_driver->init_termios = tty_std_termios;
3575 if (default_utf8)
3576 console_driver->init_termios.c_iflag |= IUTF8;
3577 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3578 tty_set_operations(console_driver, &con_ops);
3579 if (tty_register_driver(console_driver))
3580 panic("Couldn't register console driver\n");
3581 kbd_init();
3582 console_map_init();
3583#ifdef CONFIG_MDA_CONSOLE
3584 mda_console_init();
3585#endif
3586 return 0;
3587}
3588
3589#ifndef VT_SINGLE_DRIVER
3590
3591static struct class *vtconsole_class;
3592
3593static int do_bind_con_driver(const struct consw *csw, int first, int last,
3594 int deflt)
3595{
3596 struct module *owner = csw->owner;
3597 const char *desc = NULL;
3598 struct con_driver *con_driver;
3599 int i, j = -1, k = -1, retval = -ENODEV;
3600
3601 if (!try_module_get(owner))
3602 return -ENODEV;
3603
3604 WARN_CONSOLE_UNLOCKED();
3605
3606 /* check if driver is registered */
3607 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3608 con_driver = ®istered_con_driver[i];
3609
3610 if (con_driver->con == csw) {
3611 desc = con_driver->desc;
3612 retval = 0;
3613 break;
3614 }
3615 }
3616
3617 if (retval)
3618 goto err;
3619
3620 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3621 csw->con_startup();
3622 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3623 }
3624
3625 if (deflt) {
3626 if (conswitchp)
3627 module_put(conswitchp->owner);
3628
3629 __module_get(owner);
3630 conswitchp = csw;
3631 }
3632
3633 first = max(first, con_driver->first);
3634 last = min(last, con_driver->last);
3635
3636 for (i = first; i <= last; i++) {
3637 int old_was_color;
3638 struct vc_data *vc = vc_cons[i].d;
3639
3640 if (con_driver_map[i])
3641 module_put(con_driver_map[i]->owner);
3642 __module_get(owner);
3643 con_driver_map[i] = csw;
3644
3645 if (!vc || !vc->vc_sw)
3646 continue;
3647
3648 j = i;
3649
3650 if (con_is_visible(vc)) {
3651 k = i;
3652 save_screen(vc);
3653 }
3654
3655 old_was_color = vc->vc_can_do_color;
3656 vc->vc_sw->con_deinit(vc);
3657 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3658 visual_init(vc, i, 0);
3659 set_origin(vc);
3660 update_attr(vc);
3661
3662 /* If the console changed between mono <-> color, then
3663 * the attributes in the screenbuf will be wrong. The
3664 * following resets all attributes to something sane.
3665 */
3666 if (old_was_color != vc->vc_can_do_color)
3667 clear_buffer_attributes(vc);
3668 }
3669
3670 pr_info("Console: switching ");
3671 if (!deflt)
3672 pr_cont("consoles %d-%d ", first + 1, last + 1);
3673 if (j >= 0) {
3674 struct vc_data *vc = vc_cons[j].d;
3675
3676 pr_cont("to %s %s %dx%d\n",
3677 vc->vc_can_do_color ? "colour" : "mono",
3678 desc, vc->vc_cols, vc->vc_rows);
3679
3680 if (k >= 0) {
3681 vc = vc_cons[k].d;
3682 update_screen(vc);
3683 }
3684 } else {
3685 pr_cont("to %s\n", desc);
3686 }
3687
3688 retval = 0;
3689err:
3690 module_put(owner);
3691 return retval;
3692};
3693
3694
3695#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3696int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3697{
3698 struct module *owner = csw->owner;
3699 const struct consw *defcsw = NULL;
3700 struct con_driver *con_driver = NULL, *con_back = NULL;
3701 int i, retval = -ENODEV;
3702
3703 if (!try_module_get(owner))
3704 return -ENODEV;
3705
3706 WARN_CONSOLE_UNLOCKED();
3707
3708 /* check if driver is registered and if it is unbindable */
3709 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3710 con_driver = ®istered_con_driver[i];
3711
3712 if (con_driver->con == csw &&
3713 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3714 retval = 0;
3715 break;
3716 }
3717 }
3718
3719 if (retval)
3720 goto err;
3721
3722 retval = -ENODEV;
3723
3724 /* check if backup driver exists */
3725 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3726 con_back = ®istered_con_driver[i];
3727
3728 if (con_back->con && con_back->con != csw) {
3729 defcsw = con_back->con;
3730 retval = 0;
3731 break;
3732 }
3733 }
3734
3735 if (retval)
3736 goto err;
3737
3738 if (!con_is_bound(csw))
3739 goto err;
3740
3741 first = max(first, con_driver->first);
3742 last = min(last, con_driver->last);
3743
3744 for (i = first; i <= last; i++) {
3745 if (con_driver_map[i] == csw) {
3746 module_put(csw->owner);
3747 con_driver_map[i] = NULL;
3748 }
3749 }
3750
3751 if (!con_is_bound(defcsw)) {
3752 const struct consw *defconsw = conswitchp;
3753
3754 defcsw->con_startup();
3755 con_back->flag |= CON_DRIVER_FLAG_INIT;
3756 /*
3757 * vgacon may change the default driver to point
3758 * to dummycon, we restore it here...
3759 */
3760 conswitchp = defconsw;
3761 }
3762
3763 if (!con_is_bound(csw))
3764 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3765
3766 /* ignore return value, binding should not fail */
3767 do_bind_con_driver(defcsw, first, last, deflt);
3768err:
3769 module_put(owner);
3770 return retval;
3771
3772}
3773EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3774
3775static int vt_bind(struct con_driver *con)
3776{
3777 const struct consw *defcsw = NULL, *csw = NULL;
3778 int i, more = 1, first = -1, last = -1, deflt = 0;
3779
3780 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3781 goto err;
3782
3783 csw = con->con;
3784
3785 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3786 struct con_driver *con = ®istered_con_driver[i];
3787
3788 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3789 defcsw = con->con;
3790 break;
3791 }
3792 }
3793
3794 if (!defcsw)
3795 goto err;
3796
3797 while (more) {
3798 more = 0;
3799
3800 for (i = con->first; i <= con->last; i++) {
3801 if (con_driver_map[i] == defcsw) {
3802 if (first == -1)
3803 first = i;
3804 last = i;
3805 more = 1;
3806 } else if (first != -1)
3807 break;
3808 }
3809
3810 if (first == 0 && last == MAX_NR_CONSOLES -1)
3811 deflt = 1;
3812
3813 if (first != -1)
3814 do_bind_con_driver(csw, first, last, deflt);
3815
3816 first = -1;
3817 last = -1;
3818 deflt = 0;
3819 }
3820
3821err:
3822 return 0;
3823}
3824
3825static int vt_unbind(struct con_driver *con)
3826{
3827 const struct consw *csw = NULL;
3828 int i, more = 1, first = -1, last = -1, deflt = 0;
3829 int ret;
3830
3831 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3832 goto err;
3833
3834 csw = con->con;
3835
3836 while (more) {
3837 more = 0;
3838
3839 for (i = con->first; i <= con->last; i++) {
3840 if (con_driver_map[i] == csw) {
3841 if (first == -1)
3842 first = i;
3843 last = i;
3844 more = 1;
3845 } else if (first != -1)
3846 break;
3847 }
3848
3849 if (first == 0 && last == MAX_NR_CONSOLES -1)
3850 deflt = 1;
3851
3852 if (first != -1) {
3853 ret = do_unbind_con_driver(csw, first, last, deflt);
3854 if (ret != 0)
3855 return ret;
3856 }
3857
3858 first = -1;
3859 last = -1;
3860 deflt = 0;
3861 }
3862
3863err:
3864 return 0;
3865}
3866#else
3867static inline int vt_bind(struct con_driver *con)
3868{
3869 return 0;
3870}
3871static inline int vt_unbind(struct con_driver *con)
3872{
3873 return 0;
3874}
3875#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3876
3877static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3878 const char *buf, size_t count)
3879{
3880 struct con_driver *con = dev_get_drvdata(dev);
3881 int bind = simple_strtoul(buf, NULL, 0);
3882
3883 console_lock();
3884
3885 if (bind)
3886 vt_bind(con);
3887 else
3888 vt_unbind(con);
3889
3890 console_unlock();
3891
3892 return count;
3893}
3894
3895static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3896 char *buf)
3897{
3898 struct con_driver *con = dev_get_drvdata(dev);
3899 int bind;
3900
3901 console_lock();
3902 bind = con_is_bound(con->con);
3903 console_unlock();
3904
3905 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3906}
3907
3908static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3909 char *buf)
3910{
3911 struct con_driver *con = dev_get_drvdata(dev);
3912
3913 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3914 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3915 con->desc);
3916
3917}
3918
3919static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3920static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3921
3922static struct attribute *con_dev_attrs[] = {
3923 &dev_attr_bind.attr,
3924 &dev_attr_name.attr,
3925 NULL
3926};
3927
3928ATTRIBUTE_GROUPS(con_dev);
3929
3930static int vtconsole_init_device(struct con_driver *con)
3931{
3932 con->flag |= CON_DRIVER_FLAG_ATTR;
3933 return 0;
3934}
3935
3936static void vtconsole_deinit_device(struct con_driver *con)
3937{
3938 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3939}
3940
3941/**
3942 * con_is_bound - checks if driver is bound to the console
3943 * @csw: console driver
3944 *
3945 * RETURNS: zero if unbound, nonzero if bound
3946 *
3947 * Drivers can call this and if zero, they should release
3948 * all resources allocated on con_startup()
3949 */
3950int con_is_bound(const struct consw *csw)
3951{
3952 int i, bound = 0;
3953
3954 WARN_CONSOLE_UNLOCKED();
3955
3956 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3957 if (con_driver_map[i] == csw) {
3958 bound = 1;
3959 break;
3960 }
3961 }
3962
3963 return bound;
3964}
3965EXPORT_SYMBOL(con_is_bound);
3966
3967/**
3968 * con_is_visible - checks whether the current console is visible
3969 * @vc: virtual console
3970 *
3971 * RETURNS: zero if not visible, nonzero if visible
3972 */
3973bool con_is_visible(const struct vc_data *vc)
3974{
3975 WARN_CONSOLE_UNLOCKED();
3976
3977 return *vc->vc_display_fg == vc;
3978}
3979EXPORT_SYMBOL(con_is_visible);
3980
3981/**
3982 * con_debug_enter - prepare the console for the kernel debugger
3983 * @sw: console driver
3984 *
3985 * Called when the console is taken over by the kernel debugger, this
3986 * function needs to save the current console state, then put the console
3987 * into a state suitable for the kernel debugger.
3988 *
3989 * RETURNS:
3990 * Zero on success, nonzero if a failure occurred when trying to prepare
3991 * the console for the debugger.
3992 */
3993int con_debug_enter(struct vc_data *vc)
3994{
3995 int ret = 0;
3996
3997 saved_fg_console = fg_console;
3998 saved_last_console = last_console;
3999 saved_want_console = want_console;
4000 saved_vc_mode = vc->vc_mode;
4001 saved_console_blanked = console_blanked;
4002 vc->vc_mode = KD_TEXT;
4003 console_blanked = 0;
4004 if (vc->vc_sw->con_debug_enter)
4005 ret = vc->vc_sw->con_debug_enter(vc);
4006#ifdef CONFIG_KGDB_KDB
4007 /* Set the initial LINES variable if it is not already set */
4008 if (vc->vc_rows < 999) {
4009 int linecount;
4010 char lns[4];
4011 const char *setargs[3] = {
4012 "set",
4013 "LINES",
4014 lns,
4015 };
4016 if (kdbgetintenv(setargs[0], &linecount)) {
4017 snprintf(lns, 4, "%i", vc->vc_rows);
4018 kdb_set(2, setargs);
4019 }
4020 }
4021 if (vc->vc_cols < 999) {
4022 int colcount;
4023 char cols[4];
4024 const char *setargs[3] = {
4025 "set",
4026 "COLUMNS",
4027 cols,
4028 };
4029 if (kdbgetintenv(setargs[0], &colcount)) {
4030 snprintf(cols, 4, "%i", vc->vc_cols);
4031 kdb_set(2, setargs);
4032 }
4033 }
4034#endif /* CONFIG_KGDB_KDB */
4035 return ret;
4036}
4037EXPORT_SYMBOL_GPL(con_debug_enter);
4038
4039/**
4040 * con_debug_leave - restore console state
4041 * @sw: console driver
4042 *
4043 * Restore the console state to what it was before the kernel debugger
4044 * was invoked.
4045 *
4046 * RETURNS:
4047 * Zero on success, nonzero if a failure occurred when trying to restore
4048 * the console.
4049 */
4050int con_debug_leave(void)
4051{
4052 struct vc_data *vc;
4053 int ret = 0;
4054
4055 fg_console = saved_fg_console;
4056 last_console = saved_last_console;
4057 want_console = saved_want_console;
4058 console_blanked = saved_console_blanked;
4059 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4060
4061 vc = vc_cons[fg_console].d;
4062 if (vc->vc_sw->con_debug_leave)
4063 ret = vc->vc_sw->con_debug_leave(vc);
4064 return ret;
4065}
4066EXPORT_SYMBOL_GPL(con_debug_leave);
4067
4068static int do_register_con_driver(const struct consw *csw, int first, int last)
4069{
4070 struct module *owner = csw->owner;
4071 struct con_driver *con_driver;
4072 const char *desc;
4073 int i, retval;
4074
4075 WARN_CONSOLE_UNLOCKED();
4076
4077 if (!try_module_get(owner))
4078 return -ENODEV;
4079
4080 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4081 con_driver = ®istered_con_driver[i];
4082
4083 /* already registered */
4084 if (con_driver->con == csw) {
4085 retval = -EBUSY;
4086 goto err;
4087 }
4088 }
4089
4090 desc = csw->con_startup();
4091 if (!desc) {
4092 retval = -ENODEV;
4093 goto err;
4094 }
4095
4096 retval = -EINVAL;
4097
4098 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4099 con_driver = ®istered_con_driver[i];
4100
4101 if (con_driver->con == NULL &&
4102 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4103 con_driver->con = csw;
4104 con_driver->desc = desc;
4105 con_driver->node = i;
4106 con_driver->flag = CON_DRIVER_FLAG_MODULE |
4107 CON_DRIVER_FLAG_INIT;
4108 con_driver->first = first;
4109 con_driver->last = last;
4110 retval = 0;
4111 break;
4112 }
4113 }
4114
4115 if (retval)
4116 goto err;
4117
4118 con_driver->dev =
4119 device_create_with_groups(vtconsole_class, NULL,
4120 MKDEV(0, con_driver->node),
4121 con_driver, con_dev_groups,
4122 "vtcon%i", con_driver->node);
4123 if (IS_ERR(con_driver->dev)) {
4124 pr_warn("Unable to create device for %s; errno = %ld\n",
4125 con_driver->desc, PTR_ERR(con_driver->dev));
4126 con_driver->dev = NULL;
4127 } else {
4128 vtconsole_init_device(con_driver);
4129 }
4130
4131err:
4132 module_put(owner);
4133 return retval;
4134}
4135
4136
4137/**
4138 * do_unregister_con_driver - unregister console driver from console layer
4139 * @csw: console driver
4140 *
4141 * DESCRIPTION: All drivers that registers to the console layer must
4142 * call this function upon exit, or if the console driver is in a state
4143 * where it won't be able to handle console services, such as the
4144 * framebuffer console without loaded framebuffer drivers.
4145 *
4146 * The driver must unbind first prior to unregistration.
4147 */
4148int do_unregister_con_driver(const struct consw *csw)
4149{
4150 int i;
4151
4152 /* cannot unregister a bound driver */
4153 if (con_is_bound(csw))
4154 return -EBUSY;
4155
4156 if (csw == conswitchp)
4157 return -EINVAL;
4158
4159 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4160 struct con_driver *con_driver = ®istered_con_driver[i];
4161
4162 if (con_driver->con == csw) {
4163 /*
4164 * Defer the removal of the sysfs entries since that
4165 * will acquire the kernfs s_active lock and we can't
4166 * acquire this lock while holding the console lock:
4167 * the unbind sysfs entry imposes already the opposite
4168 * order. Reset con already here to prevent any later
4169 * lookup to succeed and mark this slot as zombie, so
4170 * it won't get reused until we complete the removal
4171 * in the deferred work.
4172 */
4173 con_driver->con = NULL;
4174 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4175 schedule_work(&con_driver_unregister_work);
4176
4177 return 0;
4178 }
4179 }
4180
4181 return -ENODEV;
4182}
4183EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4184
4185static void con_driver_unregister_callback(struct work_struct *ignored)
4186{
4187 int i;
4188
4189 console_lock();
4190
4191 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4192 struct con_driver *con_driver = ®istered_con_driver[i];
4193
4194 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4195 continue;
4196
4197 console_unlock();
4198
4199 vtconsole_deinit_device(con_driver);
4200 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4201
4202 console_lock();
4203
4204 if (WARN_ON_ONCE(con_driver->con))
4205 con_driver->con = NULL;
4206 con_driver->desc = NULL;
4207 con_driver->dev = NULL;
4208 con_driver->node = 0;
4209 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4210 con_driver->flag = 0;
4211 con_driver->first = 0;
4212 con_driver->last = 0;
4213 }
4214
4215 console_unlock();
4216}
4217
4218/*
4219 * If we support more console drivers, this function is used
4220 * when a driver wants to take over some existing consoles
4221 * and become default driver for newly opened ones.
4222 *
4223 * do_take_over_console is basically a register followed by bind
4224 */
4225int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4226{
4227 int err;
4228
4229 err = do_register_con_driver(csw, first, last);
4230 /*
4231 * If we get an busy error we still want to bind the console driver
4232 * and return success, as we may have unbound the console driver
4233 * but not unregistered it.
4234 */
4235 if (err == -EBUSY)
4236 err = 0;
4237 if (!err)
4238 do_bind_con_driver(csw, first, last, deflt);
4239
4240 return err;
4241}
4242EXPORT_SYMBOL_GPL(do_take_over_console);
4243
4244
4245/*
4246 * give_up_console is a wrapper to unregister_con_driver. It will only
4247 * work if driver is fully unbound.
4248 */
4249void give_up_console(const struct consw *csw)
4250{
4251 console_lock();
4252 do_unregister_con_driver(csw);
4253 console_unlock();
4254}
4255
4256static int __init vtconsole_class_init(void)
4257{
4258 int i;
4259
4260 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4261 if (IS_ERR(vtconsole_class)) {
4262 pr_warn("Unable to create vt console class; errno = %ld\n",
4263 PTR_ERR(vtconsole_class));
4264 vtconsole_class = NULL;
4265 }
4266
4267 /* Add system drivers to sysfs */
4268 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4269 struct con_driver *con = ®istered_con_driver[i];
4270
4271 if (con->con && !con->dev) {
4272 con->dev =
4273 device_create_with_groups(vtconsole_class, NULL,
4274 MKDEV(0, con->node),
4275 con, con_dev_groups,
4276 "vtcon%i", con->node);
4277
4278 if (IS_ERR(con->dev)) {
4279 pr_warn("Unable to create device for %s; errno = %ld\n",
4280 con->desc, PTR_ERR(con->dev));
4281 con->dev = NULL;
4282 } else {
4283 vtconsole_init_device(con);
4284 }
4285 }
4286 }
4287
4288 return 0;
4289}
4290postcore_initcall(vtconsole_class_init);
4291
4292#endif
4293
4294/*
4295 * Screen blanking
4296 */
4297
4298static int set_vesa_blanking(char __user *p)
4299{
4300 unsigned int mode;
4301
4302 if (get_user(mode, p + 1))
4303 return -EFAULT;
4304
4305 vesa_blank_mode = (mode < 4) ? mode : 0;
4306 return 0;
4307}
4308
4309void do_blank_screen(int entering_gfx)
4310{
4311 struct vc_data *vc = vc_cons[fg_console].d;
4312 int i;
4313
4314 might_sleep();
4315
4316 WARN_CONSOLE_UNLOCKED();
4317
4318 if (console_blanked) {
4319 if (blank_state == blank_vesa_wait) {
4320 blank_state = blank_off;
4321 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4322 }
4323 return;
4324 }
4325
4326 /* entering graphics mode? */
4327 if (entering_gfx) {
4328 hide_cursor(vc);
4329 save_screen(vc);
4330 vc->vc_sw->con_blank(vc, -1, 1);
4331 console_blanked = fg_console + 1;
4332 blank_state = blank_off;
4333 set_origin(vc);
4334 return;
4335 }
4336
4337 blank_state = blank_off;
4338
4339 /* don't blank graphics */
4340 if (vc->vc_mode != KD_TEXT) {
4341 console_blanked = fg_console + 1;
4342 return;
4343 }
4344
4345 hide_cursor(vc);
4346 del_timer_sync(&console_timer);
4347 blank_timer_expired = 0;
4348
4349 save_screen(vc);
4350 /* In case we need to reset origin, blanking hook returns 1 */
4351 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4352 console_blanked = fg_console + 1;
4353 if (i)
4354 set_origin(vc);
4355
4356 if (console_blank_hook && console_blank_hook(1))
4357 return;
4358
4359 if (vesa_off_interval && vesa_blank_mode) {
4360 blank_state = blank_vesa_wait;
4361 mod_timer(&console_timer, jiffies + vesa_off_interval);
4362 }
4363 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4364}
4365EXPORT_SYMBOL(do_blank_screen);
4366
4367/*
4368 * Called by timer as well as from vt_console_driver
4369 */
4370void do_unblank_screen(int leaving_gfx)
4371{
4372 struct vc_data *vc;
4373
4374 /* This should now always be called from a "sane" (read: can schedule)
4375 * context for the sake of the low level drivers, except in the special
4376 * case of oops_in_progress
4377 */
4378 if (!oops_in_progress)
4379 might_sleep();
4380
4381 WARN_CONSOLE_UNLOCKED();
4382
4383 ignore_poke = 0;
4384 if (!console_blanked)
4385 return;
4386 if (!vc_cons_allocated(fg_console)) {
4387 /* impossible */
4388 pr_warn("unblank_screen: tty %d not allocated ??\n",
4389 fg_console + 1);
4390 return;
4391 }
4392 vc = vc_cons[fg_console].d;
4393 if (vc->vc_mode != KD_TEXT)
4394 return; /* but leave console_blanked != 0 */
4395
4396 if (blankinterval) {
4397 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4398 blank_state = blank_normal_wait;
4399 }
4400
4401 console_blanked = 0;
4402 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4403 /* Low-level driver cannot restore -> do it ourselves */
4404 update_screen(vc);
4405 if (console_blank_hook)
4406 console_blank_hook(0);
4407 set_palette(vc);
4408 set_cursor(vc);
4409 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4410}
4411EXPORT_SYMBOL(do_unblank_screen);
4412
4413/*
4414 * This is called by the outside world to cause a forced unblank, mostly for
4415 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4416 * call it with 1 as an argument and so force a mode restore... that may kill
4417 * X or at least garbage the screen but would also make the Oops visible...
4418 */
4419void unblank_screen(void)
4420{
4421 do_unblank_screen(0);
4422}
4423
4424/*
4425 * We defer the timer blanking to work queue so it can take the console mutex
4426 * (console operations can still happen at irq time, but only from printk which
4427 * has the console mutex. Not perfect yet, but better than no locking
4428 */
4429static void blank_screen_t(struct timer_list *unused)
4430{
4431 blank_timer_expired = 1;
4432 schedule_work(&console_work);
4433}
4434
4435void poke_blanked_console(void)
4436{
4437 WARN_CONSOLE_UNLOCKED();
4438
4439 /* Add this so we quickly catch whoever might call us in a non
4440 * safe context. Nowadays, unblank_screen() isn't to be called in
4441 * atomic contexts and is allowed to schedule (with the special case
4442 * of oops_in_progress, but that isn't of any concern for this
4443 * function. --BenH.
4444 */
4445 might_sleep();
4446
4447 /* This isn't perfectly race free, but a race here would be mostly harmless,
4448 * at worse, we'll do a spurrious blank and it's unlikely
4449 */
4450 del_timer(&console_timer);
4451 blank_timer_expired = 0;
4452
4453 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4454 return;
4455 if (console_blanked)
4456 unblank_screen();
4457 else if (blankinterval) {
4458 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4459 blank_state = blank_normal_wait;
4460 }
4461}
4462
4463/*
4464 * Palettes
4465 */
4466
4467static void set_palette(struct vc_data *vc)
4468{
4469 WARN_CONSOLE_UNLOCKED();
4470
4471 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4472 vc->vc_sw->con_set_palette(vc, color_table);
4473}
4474
4475/*
4476 * Load palette into the DAC registers. arg points to a colour
4477 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4478 */
4479
4480int con_set_cmap(unsigned char __user *arg)
4481{
4482 int i, j, k;
4483 unsigned char colormap[3*16];
4484
4485 if (copy_from_user(colormap, arg, sizeof(colormap)))
4486 return -EFAULT;
4487
4488 console_lock();
4489 for (i = k = 0; i < 16; i++) {
4490 default_red[i] = colormap[k++];
4491 default_grn[i] = colormap[k++];
4492 default_blu[i] = colormap[k++];
4493 }
4494 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4495 if (!vc_cons_allocated(i))
4496 continue;
4497 for (j = k = 0; j < 16; j++) {
4498 vc_cons[i].d->vc_palette[k++] = default_red[j];
4499 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4500 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4501 }
4502 set_palette(vc_cons[i].d);
4503 }
4504 console_unlock();
4505
4506 return 0;
4507}
4508
4509int con_get_cmap(unsigned char __user *arg)
4510{
4511 int i, k;
4512 unsigned char colormap[3*16];
4513
4514 console_lock();
4515 for (i = k = 0; i < 16; i++) {
4516 colormap[k++] = default_red[i];
4517 colormap[k++] = default_grn[i];
4518 colormap[k++] = default_blu[i];
4519 }
4520 console_unlock();
4521
4522 if (copy_to_user(arg, colormap, sizeof(colormap)))
4523 return -EFAULT;
4524
4525 return 0;
4526}
4527
4528void reset_palette(struct vc_data *vc)
4529{
4530 int j, k;
4531 for (j=k=0; j<16; j++) {
4532 vc->vc_palette[k++] = default_red[j];
4533 vc->vc_palette[k++] = default_grn[j];
4534 vc->vc_palette[k++] = default_blu[j];
4535 }
4536 set_palette(vc);
4537}
4538
4539/*
4540 * Font switching
4541 *
4542 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4543 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4544 * depending on width) reserved for each character which is kinda wasty, but
4545 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4546 * is up to the actual low-level console-driver convert data into its favorite
4547 * format (maybe we should add a `fontoffset' field to the `display'
4548 * structure so we won't have to convert the fontdata all the time.
4549 * /Jes
4550 */
4551
4552#define max_font_size 65536
4553
4554static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4555{
4556 struct console_font font;
4557 int rc = -EINVAL;
4558 int c;
4559
4560 if (op->data) {
4561 font.data = kmalloc(max_font_size, GFP_KERNEL);
4562 if (!font.data)
4563 return -ENOMEM;
4564 } else
4565 font.data = NULL;
4566
4567 console_lock();
4568 if (vc->vc_mode != KD_TEXT)
4569 rc = -EINVAL;
4570 else if (vc->vc_sw->con_font_get)
4571 rc = vc->vc_sw->con_font_get(vc, &font);
4572 else
4573 rc = -ENOSYS;
4574 console_unlock();
4575
4576 if (rc)
4577 goto out;
4578
4579 c = (font.width+7)/8 * 32 * font.charcount;
4580
4581 if (op->data && font.charcount > op->charcount)
4582 rc = -ENOSPC;
4583 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4584 if (font.width > op->width || font.height > op->height)
4585 rc = -ENOSPC;
4586 } else {
4587 if (font.width != 8)
4588 rc = -EIO;
4589 else if ((op->height && font.height > op->height) ||
4590 font.height > 32)
4591 rc = -ENOSPC;
4592 }
4593 if (rc)
4594 goto out;
4595
4596 op->height = font.height;
4597 op->width = font.width;
4598 op->charcount = font.charcount;
4599
4600 if (op->data && copy_to_user(op->data, font.data, c))
4601 rc = -EFAULT;
4602
4603out:
4604 kfree(font.data);
4605 return rc;
4606}
4607
4608static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4609{
4610 struct console_font font;
4611 int rc = -EINVAL;
4612 int size;
4613
4614 if (vc->vc_mode != KD_TEXT)
4615 return -EINVAL;
4616 if (!op->data)
4617 return -EINVAL;
4618 if (op->charcount > 512)
4619 return -EINVAL;
4620 if (op->width <= 0 || op->width > 32 || op->height > 32)
4621 return -EINVAL;
4622 size = (op->width+7)/8 * 32 * op->charcount;
4623 if (size > max_font_size)
4624 return -ENOSPC;
4625
4626 font.data = memdup_user(op->data, size);
4627 if (IS_ERR(font.data))
4628 return PTR_ERR(font.data);
4629
4630 if (!op->height) { /* Need to guess font height [compat] */
4631 int h, i;
4632 u8 *charmap = font.data;
4633
4634 /*
4635 * If from KDFONTOP ioctl, don't allow things which can be done
4636 * in userland,so that we can get rid of this soon
4637 */
4638 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4639 kfree(font.data);
4640 return -EINVAL;
4641 }
4642
4643 for (h = 32; h > 0; h--)
4644 for (i = 0; i < op->charcount; i++)
4645 if (charmap[32*i+h-1])
4646 goto nonzero;
4647
4648 kfree(font.data);
4649 return -EINVAL;
4650
4651 nonzero:
4652 op->height = h;
4653 }
4654
4655 font.charcount = op->charcount;
4656 font.width = op->width;
4657 font.height = op->height;
4658
4659 console_lock();
4660 if (vc->vc_mode != KD_TEXT)
4661 rc = -EINVAL;
4662 else if (vc->vc_sw->con_font_set)
4663 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4664 else
4665 rc = -ENOSYS;
4666 console_unlock();
4667 kfree(font.data);
4668 return rc;
4669}
4670
4671static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4672{
4673 struct console_font font = {.width = op->width, .height = op->height};
4674 char name[MAX_FONT_NAME];
4675 char *s = name;
4676 int rc;
4677
4678
4679 if (!op->data)
4680 s = NULL;
4681 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4682 return -EFAULT;
4683 else
4684 name[MAX_FONT_NAME - 1] = 0;
4685
4686 console_lock();
4687 if (vc->vc_mode != KD_TEXT) {
4688 console_unlock();
4689 return -EINVAL;
4690 }
4691 if (vc->vc_sw->con_font_default)
4692 rc = vc->vc_sw->con_font_default(vc, &font, s);
4693 else
4694 rc = -ENOSYS;
4695 console_unlock();
4696 if (!rc) {
4697 op->width = font.width;
4698 op->height = font.height;
4699 }
4700 return rc;
4701}
4702
4703static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4704{
4705 int con = op->height;
4706 int rc;
4707
4708
4709 console_lock();
4710 if (vc->vc_mode != KD_TEXT)
4711 rc = -EINVAL;
4712 else if (!vc->vc_sw->con_font_copy)
4713 rc = -ENOSYS;
4714 else if (con < 0 || !vc_cons_allocated(con))
4715 rc = -ENOTTY;
4716 else if (con == vc->vc_num) /* nothing to do */
4717 rc = 0;
4718 else
4719 rc = vc->vc_sw->con_font_copy(vc, con);
4720 console_unlock();
4721 return rc;
4722}
4723
4724int con_font_op(struct vc_data *vc, struct console_font_op *op)
4725{
4726 switch (op->op) {
4727 case KD_FONT_OP_SET:
4728 return con_font_set(vc, op);
4729 case KD_FONT_OP_GET:
4730 return con_font_get(vc, op);
4731 case KD_FONT_OP_SET_DEFAULT:
4732 return con_font_default(vc, op);
4733 case KD_FONT_OP_COPY:
4734 return con_font_copy(vc, op);
4735 }
4736 return -ENOSYS;
4737}
4738
4739/*
4740 * Interface exported to selection and vcs.
4741 */
4742
4743/* used by selection */
4744u16 screen_glyph(struct vc_data *vc, int offset)
4745{
4746 u16 w = scr_readw(screenpos(vc, offset, 1));
4747 u16 c = w & 0xff;
4748
4749 if (w & vc->vc_hi_font_mask)
4750 c |= 0x100;
4751 return c;
4752}
4753EXPORT_SYMBOL_GPL(screen_glyph);
4754
4755u32 screen_glyph_unicode(struct vc_data *vc, int n)
4756{
4757 struct uni_screen *uniscr = get_vc_uniscr(vc);
4758
4759 if (uniscr)
4760 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4761 return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4762}
4763EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4764
4765/* used by vcs - note the word offset */
4766unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4767{
4768 return screenpos(vc, 2 * w_offset, viewed);
4769}
4770EXPORT_SYMBOL_GPL(screen_pos);
4771
4772void getconsxy(struct vc_data *vc, unsigned char *p)
4773{
4774 /* clamp values if they don't fit */
4775 p[0] = min(vc->state.x, 0xFFu);
4776 p[1] = min(vc->state.y, 0xFFu);
4777}
4778
4779void putconsxy(struct vc_data *vc, unsigned char *p)
4780{
4781 hide_cursor(vc);
4782 gotoxy(vc, p[0], p[1]);
4783 set_cursor(vc);
4784}
4785
4786u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4787{
4788 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4789 return softcursor_original;
4790 return scr_readw(org);
4791}
4792
4793void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4794{
4795 scr_writew(val, org);
4796 if ((unsigned long)org == vc->vc_pos) {
4797 softcursor_original = -1;
4798 add_softcursor(vc);
4799 }
4800}
4801
4802void vcs_scr_updated(struct vc_data *vc)
4803{
4804 notify_update(vc);
4805}
4806
4807void vc_scrolldelta_helper(struct vc_data *c, int lines,
4808 unsigned int rolled_over, void *base, unsigned int size)
4809{
4810 unsigned long ubase = (unsigned long)base;
4811 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4812 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4813 ptrdiff_t origin = (void *)c->vc_origin - base;
4814 int margin = c->vc_size_row * 4;
4815 int from, wrap, from_off, avail;
4816
4817 /* Turn scrollback off */
4818 if (!lines) {
4819 c->vc_visible_origin = c->vc_origin;
4820 return;
4821 }
4822
4823 /* Do we have already enough to allow jumping from 0 to the end? */
4824 if (rolled_over > scr_end + margin) {
4825 from = scr_end;
4826 wrap = rolled_over + c->vc_size_row;
4827 } else {
4828 from = 0;
4829 wrap = size;
4830 }
4831
4832 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4833 avail = (origin - from + wrap) % wrap;
4834
4835 /* Only a little piece would be left? Show all incl. the piece! */
4836 if (avail < 2 * margin)
4837 margin = 0;
4838 if (from_off < margin)
4839 from_off = 0;
4840 if (from_off > avail - margin)
4841 from_off = avail;
4842
4843 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4844}
4845EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4846
4847/*
4848 * Visible symbols for modules
4849 */
4850
4851EXPORT_SYMBOL(color_table);
4852EXPORT_SYMBOL(default_red);
4853EXPORT_SYMBOL(default_grn);
4854EXPORT_SYMBOL(default_blu);
4855EXPORT_SYMBOL(update_region);
4856EXPORT_SYMBOL(redraw_screen);
4857EXPORT_SYMBOL(vc_resize);
4858EXPORT_SYMBOL(fg_console);
4859EXPORT_SYMBOL(console_blank_hook);
4860EXPORT_SYMBOL(console_blanked);
4861EXPORT_SYMBOL(vc_cons);
4862EXPORT_SYMBOL(global_cursor_default);
4863#ifndef VT_SINGLE_DRIVER
4864EXPORT_SYMBOL(give_up_console);
4865#endif
1/*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 */
4
5/*
6 * Hopefully this will be a rather complete VT102 implementation.
7 *
8 * Beeping thanks to John T Kohl.
9 *
10 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
11 * Chars, and VT100 enhancements by Peter MacDonald.
12 *
13 * Copy and paste function by Andrew Haylett,
14 * some enhancements by Alessandro Rubini.
15 *
16 * Code to check for different video-cards mostly by Galen Hunt,
17 * <g-hunt@ee.utah.edu>
18 *
19 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
20 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
21 *
22 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
23 * Resizing of consoles, aeb, 940926
24 *
25 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
26 * <poe@daimi.aau.dk>
27 *
28 * User-defined bell sound, new setterm control sequences and printk
29 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
30 *
31 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
32 *
33 * Merge with the abstract console driver by Geert Uytterhoeven
34 * <geert@linux-m68k.org>, Jan 1997.
35 *
36 * Original m68k console driver modifications by
37 *
38 * - Arno Griffioen <arno@usn.nl>
39 * - David Carter <carter@cs.bris.ac.uk>
40 *
41 * The abstract console driver provides a generic interface for a text
42 * console. It supports VGA text mode, frame buffer based graphical consoles
43 * and special graphics processors that are only accessible through some
44 * registers (e.g. a TMS340x0 GSP).
45 *
46 * The interface to the hardware is specified using a special structure
47 * (struct consw) which contains function pointers to console operations
48 * (see <linux/console.h> for more information).
49 *
50 * Support for changeable cursor shape
51 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
52 *
53 * Ported to i386 and con_scrolldelta fixed
54 * by Emmanuel Marty <core@ggi-project.org>, April 1998
55 *
56 * Resurrected character buffers in videoram plus lots of other trickery
57 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
58 *
59 * Removed old-style timers, introduced console_timer, made timer
60 * deletion SMP-safe. 17Jun00, Andrew Morton
61 *
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
64 *
65 * Fixed UTF-8 mode so alternate charset modes always work according
66 * to control sequences interpreted in do_con_trol function
67 * preserving backward VT100 semigraphics compatibility,
68 * malformed UTF sequences represented as sequences of replacement glyphs,
69 * original codes or '?' as a last resort if replacement glyph is undefined
70 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
71 */
72
73#include <linux/module.h>
74#include <linux/types.h>
75#include <linux/sched.h>
76#include <linux/tty.h>
77#include <linux/tty_flip.h>
78#include <linux/kernel.h>
79#include <linux/string.h>
80#include <linux/errno.h>
81#include <linux/kd.h>
82#include <linux/slab.h>
83#include <linux/major.h>
84#include <linux/mm.h>
85#include <linux/console.h>
86#include <linux/init.h>
87#include <linux/mutex.h>
88#include <linux/vt_kern.h>
89#include <linux/selection.h>
90#include <linux/tiocl.h>
91#include <linux/kbd_kern.h>
92#include <linux/consolemap.h>
93#include <linux/timer.h>
94#include <linux/interrupt.h>
95#include <linux/workqueue.h>
96#include <linux/pm.h>
97#include <linux/font.h>
98#include <linux/bitops.h>
99#include <linux/notifier.h>
100#include <linux/device.h>
101#include <linux/io.h>
102#include <linux/uaccess.h>
103#include <linux/kdb.h>
104#include <linux/ctype.h>
105
106#define MAX_NR_CON_DRIVER 16
107
108#define CON_DRIVER_FLAG_MODULE 1
109#define CON_DRIVER_FLAG_INIT 2
110#define CON_DRIVER_FLAG_ATTR 4
111#define CON_DRIVER_FLAG_ZOMBIE 8
112
113struct con_driver {
114 const struct consw *con;
115 const char *desc;
116 struct device *dev;
117 int node;
118 int first;
119 int last;
120 int flag;
121};
122
123static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
124const struct consw *conswitchp;
125
126/* A bitmap for codes <32. A bit of 1 indicates that the code
127 * corresponding to that bit number invokes some special action
128 * (such as cursor movement) and should not be displayed as a
129 * glyph unless the disp_ctrl mode is explicitly enabled.
130 */
131#define CTRL_ACTION 0x0d00ff81
132#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
133
134/*
135 * Here is the default bell parameters: 750HZ, 1/8th of a second
136 */
137#define DEFAULT_BELL_PITCH 750
138#define DEFAULT_BELL_DURATION (HZ/8)
139#define DEFAULT_CURSOR_BLINK_MS 200
140
141struct vc vc_cons [MAX_NR_CONSOLES];
142
143#ifndef VT_SINGLE_DRIVER
144static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145#endif
146
147static int con_open(struct tty_struct *, struct file *);
148static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151static void save_cur(struct vc_data *vc);
152static void reset_terminal(struct vc_data *vc, int do_clear);
153static void con_flush_chars(struct tty_struct *tty);
154static int set_vesa_blanking(char __user *p);
155static void set_cursor(struct vc_data *vc);
156static void hide_cursor(struct vc_data *vc);
157static void console_callback(struct work_struct *ignored);
158static void con_driver_unregister_callback(struct work_struct *ignored);
159static void blank_screen_t(unsigned long dummy);
160static void set_palette(struct vc_data *vc);
161
162#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
163
164static int printable; /* Is console ready for printing? */
165int default_utf8 = true;
166module_param(default_utf8, int, S_IRUGO | S_IWUSR);
167int global_cursor_default = -1;
168module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
169
170static int cur_default = CUR_DEFAULT;
171module_param(cur_default, int, S_IRUGO | S_IWUSR);
172
173/*
174 * ignore_poke: don't unblank the screen when things are typed. This is
175 * mainly for the privacy of braille terminal users.
176 */
177static int ignore_poke;
178
179int do_poke_blanked_console;
180int console_blanked;
181
182static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
183static int vesa_off_interval;
184static int blankinterval = 10*60;
185core_param(consoleblank, blankinterval, int, 0444);
186
187static DECLARE_WORK(console_work, console_callback);
188static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
189
190/*
191 * fg_console is the current virtual console,
192 * last_console is the last used one,
193 * want_console is the console we want to switch to,
194 * saved_* variants are for save/restore around kernel debugger enter/leave
195 */
196int fg_console;
197int last_console;
198int want_console = -1;
199static int saved_fg_console;
200static int saved_last_console;
201static int saved_want_console;
202static int saved_vc_mode;
203static int saved_console_blanked;
204
205/*
206 * For each existing display, we have a pointer to console currently visible
207 * on that display, allowing consoles other than fg_console to be refreshed
208 * appropriately. Unless the low-level driver supplies its own display_fg
209 * variable, we use this one for the "master display".
210 */
211static struct vc_data *master_display_fg;
212
213/*
214 * Unfortunately, we need to delay tty echo when we're currently writing to the
215 * console since the code is (and always was) not re-entrant, so we schedule
216 * all flip requests to process context with schedule-task() and run it from
217 * console_callback().
218 */
219
220/*
221 * For the same reason, we defer scrollback to the console callback.
222 */
223static int scrollback_delta;
224
225/*
226 * Hook so that the power management routines can (un)blank
227 * the console on our behalf.
228 */
229int (*console_blank_hook)(int);
230
231static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
232static int blank_state;
233static int blank_timer_expired;
234enum {
235 blank_off = 0,
236 blank_normal_wait,
237 blank_vesa_wait,
238};
239
240/*
241 * /sys/class/tty/tty0/
242 *
243 * the attribute 'active' contains the name of the current vc
244 * console and it supports poll() to detect vc switches
245 */
246static struct device *tty0dev;
247
248/*
249 * Notifier list for console events.
250 */
251static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
252
253int register_vt_notifier(struct notifier_block *nb)
254{
255 return atomic_notifier_chain_register(&vt_notifier_list, nb);
256}
257EXPORT_SYMBOL_GPL(register_vt_notifier);
258
259int unregister_vt_notifier(struct notifier_block *nb)
260{
261 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
262}
263EXPORT_SYMBOL_GPL(unregister_vt_notifier);
264
265static void notify_write(struct vc_data *vc, unsigned int unicode)
266{
267 struct vt_notifier_param param = { .vc = vc, .c = unicode };
268 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
269}
270
271static void notify_update(struct vc_data *vc)
272{
273 struct vt_notifier_param param = { .vc = vc };
274 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
275}
276/*
277 * Low-Level Functions
278 */
279
280#define IS_FG(vc) ((vc)->vc_num == fg_console)
281
282#ifdef VT_BUF_VRAM_ONLY
283#define DO_UPDATE(vc) 0
284#else
285#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
286#endif
287
288static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
289{
290 unsigned short *p;
291
292 if (!viewed)
293 p = (unsigned short *)(vc->vc_origin + offset);
294 else if (!vc->vc_sw->con_screen_pos)
295 p = (unsigned short *)(vc->vc_visible_origin + offset);
296 else
297 p = vc->vc_sw->con_screen_pos(vc, offset);
298 return p;
299}
300
301/* Called from the keyboard irq path.. */
302static inline void scrolldelta(int lines)
303{
304 /* FIXME */
305 /* scrolldelta needs some kind of consistency lock, but the BKL was
306 and still is not protecting versus the scheduled back end */
307 scrollback_delta += lines;
308 schedule_console_callback();
309}
310
311void schedule_console_callback(void)
312{
313 schedule_work(&console_work);
314}
315
316static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
317{
318 unsigned short *d, *s;
319
320 if (t+nr >= b)
321 nr = b - t - 1;
322 if (b > vc->vc_rows || t >= b || nr < 1)
323 return;
324 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
325 return;
326 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
327 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
328 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
329 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
330 vc->vc_size_row * nr);
331}
332
333static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
334{
335 unsigned short *s;
336 unsigned int step;
337
338 if (t+nr >= b)
339 nr = b - t - 1;
340 if (b > vc->vc_rows || t >= b || nr < 1)
341 return;
342 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
343 return;
344 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
345 step = vc->vc_cols * nr;
346 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
347 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
348}
349
350static void do_update_region(struct vc_data *vc, unsigned long start, int count)
351{
352#ifndef VT_BUF_VRAM_ONLY
353 unsigned int xx, yy, offset;
354 u16 *p;
355
356 p = (u16 *) start;
357 if (!vc->vc_sw->con_getxy) {
358 offset = (start - vc->vc_origin) / 2;
359 xx = offset % vc->vc_cols;
360 yy = offset / vc->vc_cols;
361 } else {
362 int nxx, nyy;
363 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
364 xx = nxx; yy = nyy;
365 }
366 for(;;) {
367 u16 attrib = scr_readw(p) & 0xff00;
368 int startx = xx;
369 u16 *q = p;
370 while (xx < vc->vc_cols && count) {
371 if (attrib != (scr_readw(p) & 0xff00)) {
372 if (p > q)
373 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
374 startx = xx;
375 q = p;
376 attrib = scr_readw(p) & 0xff00;
377 }
378 p++;
379 xx++;
380 count--;
381 }
382 if (p > q)
383 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
384 if (!count)
385 break;
386 xx = 0;
387 yy++;
388 if (vc->vc_sw->con_getxy) {
389 p = (u16 *)start;
390 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
391 }
392 }
393#endif
394}
395
396void update_region(struct vc_data *vc, unsigned long start, int count)
397{
398 WARN_CONSOLE_UNLOCKED();
399
400 if (DO_UPDATE(vc)) {
401 hide_cursor(vc);
402 do_update_region(vc, start, count);
403 set_cursor(vc);
404 }
405}
406
407/* Structure of attributes is hardware-dependent */
408
409static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
410 u8 _underline, u8 _reverse, u8 _italic)
411{
412 if (vc->vc_sw->con_build_attr)
413 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
414 _blink, _underline, _reverse, _italic);
415
416#ifndef VT_BUF_VRAM_ONLY
417/*
418 * ++roman: I completely changed the attribute format for monochrome
419 * mode (!can_do_color). The formerly used MDA (monochrome display
420 * adapter) format didn't allow the combination of certain effects.
421 * Now the attribute is just a bit vector:
422 * Bit 0..1: intensity (0..2)
423 * Bit 2 : underline
424 * Bit 3 : reverse
425 * Bit 7 : blink
426 */
427 {
428 u8 a = _color;
429 if (!vc->vc_can_do_color)
430 return _intensity |
431 (_italic ? 2 : 0) |
432 (_underline ? 4 : 0) |
433 (_reverse ? 8 : 0) |
434 (_blink ? 0x80 : 0);
435 if (_italic)
436 a = (a & 0xF0) | vc->vc_itcolor;
437 else if (_underline)
438 a = (a & 0xf0) | vc->vc_ulcolor;
439 else if (_intensity == 0)
440 a = (a & 0xf0) | vc->vc_ulcolor;
441 if (_reverse)
442 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
443 if (_blink)
444 a ^= 0x80;
445 if (_intensity == 2)
446 a ^= 0x08;
447 if (vc->vc_hi_font_mask == 0x100)
448 a <<= 1;
449 return a;
450 }
451#else
452 return 0;
453#endif
454}
455
456static void update_attr(struct vc_data *vc)
457{
458 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
459 vc->vc_blink, vc->vc_underline,
460 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
461 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
462}
463
464/* Note: inverting the screen twice should revert to the original state */
465void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
466{
467 unsigned short *p;
468
469 WARN_CONSOLE_UNLOCKED();
470
471 count /= 2;
472 p = screenpos(vc, offset, viewed);
473 if (vc->vc_sw->con_invert_region)
474 vc->vc_sw->con_invert_region(vc, p, count);
475#ifndef VT_BUF_VRAM_ONLY
476 else {
477 u16 *q = p;
478 int cnt = count;
479 u16 a;
480
481 if (!vc->vc_can_do_color) {
482 while (cnt--) {
483 a = scr_readw(q);
484 a ^= 0x0800;
485 scr_writew(a, q);
486 q++;
487 }
488 } else if (vc->vc_hi_font_mask == 0x100) {
489 while (cnt--) {
490 a = scr_readw(q);
491 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
492 scr_writew(a, q);
493 q++;
494 }
495 } else {
496 while (cnt--) {
497 a = scr_readw(q);
498 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
499 scr_writew(a, q);
500 q++;
501 }
502 }
503 }
504#endif
505 if (DO_UPDATE(vc))
506 do_update_region(vc, (unsigned long) p, count);
507 notify_update(vc);
508}
509
510/* used by selection: complement pointer position */
511void complement_pos(struct vc_data *vc, int offset)
512{
513 static int old_offset = -1;
514 static unsigned short old;
515 static unsigned short oldx, oldy;
516
517 WARN_CONSOLE_UNLOCKED();
518
519 if (old_offset != -1 && old_offset >= 0 &&
520 old_offset < vc->vc_screenbuf_size) {
521 scr_writew(old, screenpos(vc, old_offset, 1));
522 if (DO_UPDATE(vc))
523 vc->vc_sw->con_putc(vc, old, oldy, oldx);
524 notify_update(vc);
525 }
526
527 old_offset = offset;
528
529 if (offset != -1 && offset >= 0 &&
530 offset < vc->vc_screenbuf_size) {
531 unsigned short new;
532 unsigned short *p;
533 p = screenpos(vc, offset, 1);
534 old = scr_readw(p);
535 new = old ^ vc->vc_complement_mask;
536 scr_writew(new, p);
537 if (DO_UPDATE(vc)) {
538 oldx = (offset >> 1) % vc->vc_cols;
539 oldy = (offset >> 1) / vc->vc_cols;
540 vc->vc_sw->con_putc(vc, new, oldy, oldx);
541 }
542 notify_update(vc);
543 }
544}
545
546static void insert_char(struct vc_data *vc, unsigned int nr)
547{
548 unsigned short *p = (unsigned short *) vc->vc_pos;
549
550 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
551 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
552 vc->vc_need_wrap = 0;
553 if (DO_UPDATE(vc))
554 do_update_region(vc, (unsigned long) p,
555 vc->vc_cols - vc->vc_x);
556}
557
558static void delete_char(struct vc_data *vc, unsigned int nr)
559{
560 unsigned short *p = (unsigned short *) vc->vc_pos;
561
562 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
563 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
564 nr * 2);
565 vc->vc_need_wrap = 0;
566 if (DO_UPDATE(vc))
567 do_update_region(vc, (unsigned long) p,
568 vc->vc_cols - vc->vc_x);
569}
570
571static int softcursor_original = -1;
572
573static void add_softcursor(struct vc_data *vc)
574{
575 int i = scr_readw((u16 *) vc->vc_pos);
576 u32 type = vc->vc_cursor_type;
577
578 if (! (type & 0x10)) return;
579 if (softcursor_original != -1) return;
580 softcursor_original = i;
581 i |= ((type >> 8) & 0xff00 );
582 i ^= ((type) & 0xff00 );
583 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
584 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
585 scr_writew(i, (u16 *) vc->vc_pos);
586 if (DO_UPDATE(vc))
587 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
588}
589
590static void hide_softcursor(struct vc_data *vc)
591{
592 if (softcursor_original != -1) {
593 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
594 if (DO_UPDATE(vc))
595 vc->vc_sw->con_putc(vc, softcursor_original,
596 vc->vc_y, vc->vc_x);
597 softcursor_original = -1;
598 }
599}
600
601static void hide_cursor(struct vc_data *vc)
602{
603 if (vc == sel_cons)
604 clear_selection();
605 vc->vc_sw->con_cursor(vc, CM_ERASE);
606 hide_softcursor(vc);
607}
608
609static void set_cursor(struct vc_data *vc)
610{
611 if (!IS_FG(vc) || console_blanked ||
612 vc->vc_mode == KD_GRAPHICS)
613 return;
614 if (vc->vc_deccm) {
615 if (vc == sel_cons)
616 clear_selection();
617 add_softcursor(vc);
618 if ((vc->vc_cursor_type & 0x0f) != 1)
619 vc->vc_sw->con_cursor(vc, CM_DRAW);
620 } else
621 hide_cursor(vc);
622}
623
624static void set_origin(struct vc_data *vc)
625{
626 WARN_CONSOLE_UNLOCKED();
627
628 if (!CON_IS_VISIBLE(vc) ||
629 !vc->vc_sw->con_set_origin ||
630 !vc->vc_sw->con_set_origin(vc))
631 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
632 vc->vc_visible_origin = vc->vc_origin;
633 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
634 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
635}
636
637static void save_screen(struct vc_data *vc)
638{
639 WARN_CONSOLE_UNLOCKED();
640
641 if (vc->vc_sw->con_save_screen)
642 vc->vc_sw->con_save_screen(vc);
643}
644
645/*
646 * Redrawing of screen
647 */
648
649void clear_buffer_attributes(struct vc_data *vc)
650{
651 unsigned short *p = (unsigned short *)vc->vc_origin;
652 int count = vc->vc_screenbuf_size / 2;
653 int mask = vc->vc_hi_font_mask | 0xff;
654
655 for (; count > 0; count--, p++) {
656 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
657 }
658}
659
660void redraw_screen(struct vc_data *vc, int is_switch)
661{
662 int redraw = 0;
663
664 WARN_CONSOLE_UNLOCKED();
665
666 if (!vc) {
667 /* strange ... */
668 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
669 return;
670 }
671
672 if (is_switch) {
673 struct vc_data *old_vc = vc_cons[fg_console].d;
674 if (old_vc == vc)
675 return;
676 if (!CON_IS_VISIBLE(vc))
677 redraw = 1;
678 *vc->vc_display_fg = vc;
679 fg_console = vc->vc_num;
680 hide_cursor(old_vc);
681 if (!CON_IS_VISIBLE(old_vc)) {
682 save_screen(old_vc);
683 set_origin(old_vc);
684 }
685 if (tty0dev)
686 sysfs_notify(&tty0dev->kobj, NULL, "active");
687 } else {
688 hide_cursor(vc);
689 redraw = 1;
690 }
691
692 if (redraw) {
693 int update;
694 int old_was_color = vc->vc_can_do_color;
695
696 set_origin(vc);
697 update = vc->vc_sw->con_switch(vc);
698 set_palette(vc);
699 /*
700 * If console changed from mono<->color, the best we can do
701 * is to clear the buffer attributes. As it currently stands,
702 * rebuilding new attributes from the old buffer is not doable
703 * without overly complex code.
704 */
705 if (old_was_color != vc->vc_can_do_color) {
706 update_attr(vc);
707 clear_buffer_attributes(vc);
708 }
709
710 /* Forcibly update if we're panicing */
711 if ((update && vc->vc_mode != KD_GRAPHICS) ||
712 vt_force_oops_output(vc))
713 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
714 }
715 set_cursor(vc);
716 if (is_switch) {
717 set_leds();
718 compute_shiftstate();
719 notify_update(vc);
720 }
721}
722
723/*
724 * Allocation, freeing and resizing of VTs.
725 */
726
727int vc_cons_allocated(unsigned int i)
728{
729 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
730}
731
732static void visual_init(struct vc_data *vc, int num, int init)
733{
734 /* ++Geert: vc->vc_sw->con_init determines console size */
735 if (vc->vc_sw)
736 module_put(vc->vc_sw->owner);
737 vc->vc_sw = conswitchp;
738#ifndef VT_SINGLE_DRIVER
739 if (con_driver_map[num])
740 vc->vc_sw = con_driver_map[num];
741#endif
742 __module_get(vc->vc_sw->owner);
743 vc->vc_num = num;
744 vc->vc_display_fg = &master_display_fg;
745 if (vc->vc_uni_pagedir_loc)
746 con_free_unimap(vc);
747 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
748 vc->vc_uni_pagedir = NULL;
749 vc->vc_hi_font_mask = 0;
750 vc->vc_complement_mask = 0;
751 vc->vc_can_do_color = 0;
752 vc->vc_panic_force_write = false;
753 vc->vc_sw->con_init(vc, init);
754 if (!vc->vc_complement_mask)
755 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
756 vc->vc_s_complement_mask = vc->vc_complement_mask;
757 vc->vc_size_row = vc->vc_cols << 1;
758 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
759}
760
761int vc_allocate(unsigned int currcons) /* return 0 on success */
762{
763 WARN_CONSOLE_UNLOCKED();
764
765 if (currcons >= MAX_NR_CONSOLES)
766 return -ENXIO;
767 if (!vc_cons[currcons].d) {
768 struct vc_data *vc;
769 struct vt_notifier_param param;
770
771 /* prevent users from taking too much memory */
772 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
773 return -EPERM;
774
775 /* due to the granularity of kmalloc, we waste some memory here */
776 /* the alloc is done in two steps, to optimize the common situation
777 of a 25x80 console (structsize=216, screenbuf_size=4000) */
778 /* although the numbers above are not valid since long ago, the
779 point is still up-to-date and the comment still has its value
780 even if only as a historical artifact. --mj, July 1998 */
781 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
782 if (!vc)
783 return -ENOMEM;
784 vc_cons[currcons].d = vc;
785 tty_port_init(&vc->port);
786 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
787 visual_init(vc, currcons, 1);
788 if (!*vc->vc_uni_pagedir_loc)
789 con_set_default_unimap(vc);
790 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
791 if (!vc->vc_screenbuf) {
792 kfree(vc);
793 vc_cons[currcons].d = NULL;
794 return -ENOMEM;
795 }
796
797 /* If no drivers have overridden us and the user didn't pass a
798 boot option, default to displaying the cursor */
799 if (global_cursor_default == -1)
800 global_cursor_default = 1;
801
802 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
803 vcs_make_sysfs(currcons);
804 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
805 }
806 return 0;
807}
808
809static inline int resize_screen(struct vc_data *vc, int width, int height,
810 int user)
811{
812 /* Resizes the resolution of the display adapater */
813 int err = 0;
814
815 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
816 err = vc->vc_sw->con_resize(vc, width, height, user);
817
818 return err;
819}
820
821/*
822 * Change # of rows and columns (0 means unchanged/the size of fg_console)
823 * [this is to be used together with some user program
824 * like resize that changes the hardware videomode]
825 */
826#define VC_RESIZE_MAXCOL (32767)
827#define VC_RESIZE_MAXROW (32767)
828
829/**
830 * vc_do_resize - resizing method for the tty
831 * @tty: tty being resized
832 * @real_tty: real tty (different to tty if a pty/tty pair)
833 * @vc: virtual console private data
834 * @cols: columns
835 * @lines: lines
836 *
837 * Resize a virtual console, clipping according to the actual constraints.
838 * If the caller passes a tty structure then update the termios winsize
839 * information and perform any necessary signal handling.
840 *
841 * Caller must hold the console semaphore. Takes the termios rwsem and
842 * ctrl_lock of the tty IFF a tty is passed.
843 */
844
845static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
846 unsigned int cols, unsigned int lines)
847{
848 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
849 unsigned long end;
850 unsigned int old_rows, old_row_size;
851 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
852 unsigned int user;
853 unsigned short *newscreen;
854
855 WARN_CONSOLE_UNLOCKED();
856
857 if (!vc)
858 return -ENXIO;
859
860 user = vc->vc_resize_user;
861 vc->vc_resize_user = 0;
862
863 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
864 return -EINVAL;
865
866 new_cols = (cols ? cols : vc->vc_cols);
867 new_rows = (lines ? lines : vc->vc_rows);
868 new_row_size = new_cols << 1;
869 new_screen_size = new_row_size * new_rows;
870
871 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
872 return 0;
873
874 newscreen = kmalloc(new_screen_size, GFP_USER);
875 if (!newscreen)
876 return -ENOMEM;
877
878 old_rows = vc->vc_rows;
879 old_row_size = vc->vc_size_row;
880
881 err = resize_screen(vc, new_cols, new_rows, user);
882 if (err) {
883 kfree(newscreen);
884 return err;
885 }
886
887 vc->vc_rows = new_rows;
888 vc->vc_cols = new_cols;
889 vc->vc_size_row = new_row_size;
890 vc->vc_screenbuf_size = new_screen_size;
891
892 rlth = min(old_row_size, new_row_size);
893 rrem = new_row_size - rlth;
894 old_origin = vc->vc_origin;
895 new_origin = (long) newscreen;
896 new_scr_end = new_origin + new_screen_size;
897
898 if (vc->vc_y > new_rows) {
899 if (old_rows - vc->vc_y < new_rows) {
900 /*
901 * Cursor near the bottom, copy contents from the
902 * bottom of buffer
903 */
904 old_origin += (old_rows - new_rows) * old_row_size;
905 } else {
906 /*
907 * Cursor is in no man's land, copy 1/2 screenful
908 * from the top and bottom of cursor position
909 */
910 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
911 }
912 }
913
914 end = old_origin + old_row_size * min(old_rows, new_rows);
915
916 update_attr(vc);
917
918 while (old_origin < end) {
919 scr_memcpyw((unsigned short *) new_origin,
920 (unsigned short *) old_origin, rlth);
921 if (rrem)
922 scr_memsetw((void *)(new_origin + rlth),
923 vc->vc_video_erase_char, rrem);
924 old_origin += old_row_size;
925 new_origin += new_row_size;
926 }
927 if (new_scr_end > new_origin)
928 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
929 new_scr_end - new_origin);
930 kfree(vc->vc_screenbuf);
931 vc->vc_screenbuf = newscreen;
932 vc->vc_screenbuf_size = new_screen_size;
933 set_origin(vc);
934
935 /* do part of a reset_terminal() */
936 vc->vc_top = 0;
937 vc->vc_bottom = vc->vc_rows;
938 gotoxy(vc, vc->vc_x, vc->vc_y);
939 save_cur(vc);
940
941 if (tty) {
942 /* Rewrite the requested winsize data with the actual
943 resulting sizes */
944 struct winsize ws;
945 memset(&ws, 0, sizeof(ws));
946 ws.ws_row = vc->vc_rows;
947 ws.ws_col = vc->vc_cols;
948 ws.ws_ypixel = vc->vc_scan_lines;
949 tty_do_resize(tty, &ws);
950 }
951
952 if (CON_IS_VISIBLE(vc))
953 update_screen(vc);
954 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
955 return err;
956}
957
958/**
959 * vc_resize - resize a VT
960 * @vc: virtual console
961 * @cols: columns
962 * @rows: rows
963 *
964 * Resize a virtual console as seen from the console end of things. We
965 * use the common vc_do_resize methods to update the structures. The
966 * caller must hold the console sem to protect console internals and
967 * vc->port.tty
968 */
969
970int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
971{
972 return vc_do_resize(vc->port.tty, vc, cols, rows);
973}
974
975/**
976 * vt_resize - resize a VT
977 * @tty: tty to resize
978 * @ws: winsize attributes
979 *
980 * Resize a virtual terminal. This is called by the tty layer as we
981 * register our own handler for resizing. The mutual helper does all
982 * the actual work.
983 *
984 * Takes the console sem and the called methods then take the tty
985 * termios_rwsem and the tty ctrl_lock in that order.
986 */
987static int vt_resize(struct tty_struct *tty, struct winsize *ws)
988{
989 struct vc_data *vc = tty->driver_data;
990 int ret;
991
992 console_lock();
993 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
994 console_unlock();
995 return ret;
996}
997
998struct vc_data *vc_deallocate(unsigned int currcons)
999{
1000 struct vc_data *vc = NULL;
1001
1002 WARN_CONSOLE_UNLOCKED();
1003
1004 if (vc_cons_allocated(currcons)) {
1005 struct vt_notifier_param param;
1006
1007 param.vc = vc = vc_cons[currcons].d;
1008 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1009 vcs_remove_sysfs(currcons);
1010 vc->vc_sw->con_deinit(vc);
1011 put_pid(vc->vt_pid);
1012 module_put(vc->vc_sw->owner);
1013 kfree(vc->vc_screenbuf);
1014 vc_cons[currcons].d = NULL;
1015 }
1016 return vc;
1017}
1018
1019/*
1020 * VT102 emulator
1021 */
1022
1023#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1024#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1025#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1026
1027#define decarm VC_REPEAT
1028#define decckm VC_CKMODE
1029#define kbdapplic VC_APPLIC
1030#define lnm VC_CRLF
1031
1032/*
1033 * this is what the terminal answers to a ESC-Z or csi0c query.
1034 */
1035#define VT100ID "\033[?1;2c"
1036#define VT102ID "\033[?6c"
1037
1038unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1039 8,12,10,14, 9,13,11,15 };
1040
1041/* the default colour table, for VGA+ colour systems */
1042int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1043 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1044int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1045 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1046int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1047 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1048
1049module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1050module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1051module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1052
1053/*
1054 * gotoxy() must verify all boundaries, because the arguments
1055 * might also be negative. If the given position is out of
1056 * bounds, the cursor is placed at the nearest margin.
1057 */
1058static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1059{
1060 int min_y, max_y;
1061
1062 if (new_x < 0)
1063 vc->vc_x = 0;
1064 else {
1065 if (new_x >= vc->vc_cols)
1066 vc->vc_x = vc->vc_cols - 1;
1067 else
1068 vc->vc_x = new_x;
1069 }
1070
1071 if (vc->vc_decom) {
1072 min_y = vc->vc_top;
1073 max_y = vc->vc_bottom;
1074 } else {
1075 min_y = 0;
1076 max_y = vc->vc_rows;
1077 }
1078 if (new_y < min_y)
1079 vc->vc_y = min_y;
1080 else if (new_y >= max_y)
1081 vc->vc_y = max_y - 1;
1082 else
1083 vc->vc_y = new_y;
1084 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1085 vc->vc_need_wrap = 0;
1086}
1087
1088/* for absolute user moves, when decom is set */
1089static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1090{
1091 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1092}
1093
1094void scrollback(struct vc_data *vc, int lines)
1095{
1096 if (!lines)
1097 lines = vc->vc_rows / 2;
1098 scrolldelta(-lines);
1099}
1100
1101void scrollfront(struct vc_data *vc, int lines)
1102{
1103 if (!lines)
1104 lines = vc->vc_rows / 2;
1105 scrolldelta(lines);
1106}
1107
1108static void lf(struct vc_data *vc)
1109{
1110 /* don't scroll if above bottom of scrolling region, or
1111 * if below scrolling region
1112 */
1113 if (vc->vc_y + 1 == vc->vc_bottom)
1114 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1115 else if (vc->vc_y < vc->vc_rows - 1) {
1116 vc->vc_y++;
1117 vc->vc_pos += vc->vc_size_row;
1118 }
1119 vc->vc_need_wrap = 0;
1120 notify_write(vc, '\n');
1121}
1122
1123static void ri(struct vc_data *vc)
1124{
1125 /* don't scroll if below top of scrolling region, or
1126 * if above scrolling region
1127 */
1128 if (vc->vc_y == vc->vc_top)
1129 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1130 else if (vc->vc_y > 0) {
1131 vc->vc_y--;
1132 vc->vc_pos -= vc->vc_size_row;
1133 }
1134 vc->vc_need_wrap = 0;
1135}
1136
1137static inline void cr(struct vc_data *vc)
1138{
1139 vc->vc_pos -= vc->vc_x << 1;
1140 vc->vc_need_wrap = vc->vc_x = 0;
1141 notify_write(vc, '\r');
1142}
1143
1144static inline void bs(struct vc_data *vc)
1145{
1146 if (vc->vc_x) {
1147 vc->vc_pos -= 2;
1148 vc->vc_x--;
1149 vc->vc_need_wrap = 0;
1150 notify_write(vc, '\b');
1151 }
1152}
1153
1154static inline void del(struct vc_data *vc)
1155{
1156 /* ignored */
1157}
1158
1159static void csi_J(struct vc_data *vc, int vpar)
1160{
1161 unsigned int count;
1162 unsigned short * start;
1163
1164 switch (vpar) {
1165 case 0: /* erase from cursor to end of display */
1166 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1167 start = (unsigned short *)vc->vc_pos;
1168 break;
1169 case 1: /* erase from start to cursor */
1170 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1171 start = (unsigned short *)vc->vc_origin;
1172 break;
1173 case 3: /* erase scroll-back buffer (and whole display) */
1174 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1175 vc->vc_screenbuf_size >> 1);
1176 set_origin(vc);
1177 if (CON_IS_VISIBLE(vc))
1178 update_screen(vc);
1179 /* fall through */
1180 case 2: /* erase whole display */
1181 count = vc->vc_cols * vc->vc_rows;
1182 start = (unsigned short *)vc->vc_origin;
1183 break;
1184 default:
1185 return;
1186 }
1187 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1188 if (DO_UPDATE(vc))
1189 do_update_region(vc, (unsigned long) start, count);
1190 vc->vc_need_wrap = 0;
1191}
1192
1193static void csi_K(struct vc_data *vc, int vpar)
1194{
1195 unsigned int count;
1196 unsigned short * start;
1197
1198 switch (vpar) {
1199 case 0: /* erase from cursor to end of line */
1200 count = vc->vc_cols - vc->vc_x;
1201 start = (unsigned short *)vc->vc_pos;
1202 break;
1203 case 1: /* erase from start of line to cursor */
1204 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1205 count = vc->vc_x + 1;
1206 break;
1207 case 2: /* erase whole line */
1208 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1209 count = vc->vc_cols;
1210 break;
1211 default:
1212 return;
1213 }
1214 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1215 vc->vc_need_wrap = 0;
1216 if (DO_UPDATE(vc))
1217 do_update_region(vc, (unsigned long) start, count);
1218}
1219
1220static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1221{ /* not vt100? */
1222 int count;
1223
1224 if (!vpar)
1225 vpar++;
1226 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1227
1228 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1229 if (DO_UPDATE(vc))
1230 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1231 vc->vc_need_wrap = 0;
1232}
1233
1234static void default_attr(struct vc_data *vc)
1235{
1236 vc->vc_intensity = 1;
1237 vc->vc_italic = 0;
1238 vc->vc_underline = 0;
1239 vc->vc_reverse = 0;
1240 vc->vc_blink = 0;
1241 vc->vc_color = vc->vc_def_color;
1242}
1243
1244struct rgb { u8 r; u8 g; u8 b; };
1245
1246static struct rgb rgb_from_256(int i)
1247{
1248 struct rgb c;
1249 if (i < 8) { /* Standard colours. */
1250 c.r = i&1 ? 0xaa : 0x00;
1251 c.g = i&2 ? 0xaa : 0x00;
1252 c.b = i&4 ? 0xaa : 0x00;
1253 } else if (i < 16) {
1254 c.r = i&1 ? 0xff : 0x55;
1255 c.g = i&2 ? 0xff : 0x55;
1256 c.b = i&4 ? 0xff : 0x55;
1257 } else if (i < 232) { /* 6x6x6 colour cube. */
1258 c.r = (i - 16) / 36 * 85 / 2;
1259 c.g = (i - 16) / 6 % 6 * 85 / 2;
1260 c.b = (i - 16) % 6 * 85 / 2;
1261 } else /* Grayscale ramp. */
1262 c.r = c.g = c.b = i * 10 - 2312;
1263 return c;
1264}
1265
1266static void rgb_foreground(struct vc_data *vc, struct rgb c)
1267{
1268 u8 hue, max = c.r;
1269 if (c.g > max)
1270 max = c.g;
1271 if (c.b > max)
1272 max = c.b;
1273 hue = (c.r > max/2 ? 4 : 0)
1274 | (c.g > max/2 ? 2 : 0)
1275 | (c.b > max/2 ? 1 : 0);
1276 if (hue == 7 && max <= 0x55)
1277 hue = 0, vc->vc_intensity = 2;
1278 else
1279 vc->vc_intensity = (max > 0xaa) + 1;
1280 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1281}
1282
1283static void rgb_background(struct vc_data *vc, struct rgb c)
1284{
1285 /* For backgrounds, err on the dark side. */
1286 vc->vc_color = (vc->vc_color & 0x0f)
1287 | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1288}
1289
1290/* console_lock is held */
1291static void csi_m(struct vc_data *vc)
1292{
1293 int i;
1294
1295 for (i = 0; i <= vc->vc_npar; i++)
1296 switch (vc->vc_par[i]) {
1297 case 0: /* all attributes off */
1298 default_attr(vc);
1299 break;
1300 case 1:
1301 vc->vc_intensity = 2;
1302 break;
1303 case 2:
1304 vc->vc_intensity = 0;
1305 break;
1306 case 3:
1307 vc->vc_italic = 1;
1308 break;
1309 case 4:
1310 vc->vc_underline = 1;
1311 break;
1312 case 5:
1313 vc->vc_blink = 1;
1314 break;
1315 case 7:
1316 vc->vc_reverse = 1;
1317 break;
1318 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1319 * Select primary font, don't display
1320 * control chars if defined, don't set
1321 * bit 8 on output.
1322 */
1323 vc->vc_translate = set_translate(vc->vc_charset == 0
1324 ? vc->vc_G0_charset
1325 : vc->vc_G1_charset, vc);
1326 vc->vc_disp_ctrl = 0;
1327 vc->vc_toggle_meta = 0;
1328 break;
1329 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1330 * Select first alternate font, lets
1331 * chars < 32 be displayed as ROM chars.
1332 */
1333 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1334 vc->vc_disp_ctrl = 1;
1335 vc->vc_toggle_meta = 0;
1336 break;
1337 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1338 * Select second alternate font, toggle
1339 * high bit before displaying as ROM char.
1340 */
1341 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1342 vc->vc_disp_ctrl = 1;
1343 vc->vc_toggle_meta = 1;
1344 break;
1345 case 21:
1346 case 22:
1347 vc->vc_intensity = 1;
1348 break;
1349 case 23:
1350 vc->vc_italic = 0;
1351 break;
1352 case 24:
1353 vc->vc_underline = 0;
1354 break;
1355 case 25:
1356 vc->vc_blink = 0;
1357 break;
1358 case 27:
1359 vc->vc_reverse = 0;
1360 break;
1361 case 38: /* ITU T.416
1362 * Higher colour modes.
1363 * They break the usual properties of SGR codes
1364 * and thus need to be detected and ignored by
1365 * hand. Strictly speaking, that standard also
1366 * wants : rather than ; as separators, contrary
1367 * to ECMA-48, but no one produces such codes
1368 * and almost no one accepts them.
1369 */
1370 i++;
1371 if (i > vc->vc_npar)
1372 break;
1373 if (vc->vc_par[i] == 5 && /* 256 colours */
1374 i < vc->vc_npar) { /* ubiquitous */
1375 i++;
1376 rgb_foreground(vc,
1377 rgb_from_256(vc->vc_par[i]));
1378 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1379 i <= vc->vc_npar + 3) {/* extremely rare */
1380 struct rgb c = {
1381 .r = vc->vc_par[i + 1],
1382 .g = vc->vc_par[i + 2],
1383 .b = vc->vc_par[i + 3],
1384 };
1385 rgb_foreground(vc, c);
1386 i += 3;
1387 }
1388 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1389 * there's no point in supporting them.
1390 */
1391 break;
1392 case 48:
1393 i++;
1394 if (i > vc->vc_npar)
1395 break;
1396 if (vc->vc_par[i] == 5 && /* 256 colours */
1397 i < vc->vc_npar) {
1398 i++;
1399 rgb_background(vc,
1400 rgb_from_256(vc->vc_par[i]));
1401 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1402 i <= vc->vc_npar + 3) {
1403 struct rgb c = {
1404 .r = vc->vc_par[i + 1],
1405 .g = vc->vc_par[i + 2],
1406 .b = vc->vc_par[i + 3],
1407 };
1408 rgb_background(vc, c);
1409 i += 3;
1410 }
1411 break;
1412 case 39:
1413 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1414 break;
1415 case 49:
1416 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1417 break;
1418 default:
1419 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1420 vc->vc_color = color_table[vc->vc_par[i] - 30]
1421 | (vc->vc_color & 0xf0);
1422 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1423 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1424 | (vc->vc_color & 0x0f);
1425 break;
1426 }
1427 update_attr(vc);
1428}
1429
1430static void respond_string(const char *p, struct tty_port *port)
1431{
1432 while (*p) {
1433 tty_insert_flip_char(port, *p, 0);
1434 p++;
1435 }
1436 tty_schedule_flip(port);
1437}
1438
1439static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1440{
1441 char buf[40];
1442
1443 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1444 respond_string(buf, tty->port);
1445}
1446
1447static inline void status_report(struct tty_struct *tty)
1448{
1449 respond_string("\033[0n", tty->port); /* Terminal ok */
1450}
1451
1452static inline void respond_ID(struct tty_struct *tty)
1453{
1454 respond_string(VT102ID, tty->port);
1455}
1456
1457void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1458{
1459 char buf[8];
1460
1461 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1462 (char)('!' + mry));
1463 respond_string(buf, tty->port);
1464}
1465
1466/* invoked via ioctl(TIOCLINUX) and through set_selection */
1467int mouse_reporting(void)
1468{
1469 return vc_cons[fg_console].d->vc_report_mouse;
1470}
1471
1472/* console_lock is held */
1473static void set_mode(struct vc_data *vc, int on_off)
1474{
1475 int i;
1476
1477 for (i = 0; i <= vc->vc_npar; i++)
1478 if (vc->vc_ques) {
1479 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1480 case 1: /* Cursor keys send ^[Ox/^[[x */
1481 if (on_off)
1482 set_kbd(vc, decckm);
1483 else
1484 clr_kbd(vc, decckm);
1485 break;
1486 case 3: /* 80/132 mode switch unimplemented */
1487 vc->vc_deccolm = on_off;
1488#if 0
1489 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1490 /* this alone does not suffice; some user mode
1491 utility has to change the hardware regs */
1492#endif
1493 break;
1494 case 5: /* Inverted screen on/off */
1495 if (vc->vc_decscnm != on_off) {
1496 vc->vc_decscnm = on_off;
1497 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1498 update_attr(vc);
1499 }
1500 break;
1501 case 6: /* Origin relative/absolute */
1502 vc->vc_decom = on_off;
1503 gotoxay(vc, 0, 0);
1504 break;
1505 case 7: /* Autowrap on/off */
1506 vc->vc_decawm = on_off;
1507 break;
1508 case 8: /* Autorepeat on/off */
1509 if (on_off)
1510 set_kbd(vc, decarm);
1511 else
1512 clr_kbd(vc, decarm);
1513 break;
1514 case 9:
1515 vc->vc_report_mouse = on_off ? 1 : 0;
1516 break;
1517 case 25: /* Cursor on/off */
1518 vc->vc_deccm = on_off;
1519 break;
1520 case 1000:
1521 vc->vc_report_mouse = on_off ? 2 : 0;
1522 break;
1523 }
1524 } else {
1525 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1526 case 3: /* Monitor (display ctrls) */
1527 vc->vc_disp_ctrl = on_off;
1528 break;
1529 case 4: /* Insert Mode on/off */
1530 vc->vc_decim = on_off;
1531 break;
1532 case 20: /* Lf, Enter == CrLf/Lf */
1533 if (on_off)
1534 set_kbd(vc, lnm);
1535 else
1536 clr_kbd(vc, lnm);
1537 break;
1538 }
1539 }
1540}
1541
1542/* console_lock is held */
1543static void setterm_command(struct vc_data *vc)
1544{
1545 switch(vc->vc_par[0]) {
1546 case 1: /* set color for underline mode */
1547 if (vc->vc_can_do_color &&
1548 vc->vc_par[1] < 16) {
1549 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1550 if (vc->vc_underline)
1551 update_attr(vc);
1552 }
1553 break;
1554 case 2: /* set color for half intensity mode */
1555 if (vc->vc_can_do_color &&
1556 vc->vc_par[1] < 16) {
1557 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1558 if (vc->vc_intensity == 0)
1559 update_attr(vc);
1560 }
1561 break;
1562 case 8: /* store colors as defaults */
1563 vc->vc_def_color = vc->vc_attr;
1564 if (vc->vc_hi_font_mask == 0x100)
1565 vc->vc_def_color >>= 1;
1566 default_attr(vc);
1567 update_attr(vc);
1568 break;
1569 case 9: /* set blanking interval */
1570 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1571 poke_blanked_console();
1572 break;
1573 case 10: /* set bell frequency in Hz */
1574 if (vc->vc_npar >= 1)
1575 vc->vc_bell_pitch = vc->vc_par[1];
1576 else
1577 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1578 break;
1579 case 11: /* set bell duration in msec */
1580 if (vc->vc_npar >= 1)
1581 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1582 msecs_to_jiffies(vc->vc_par[1]) : 0;
1583 else
1584 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1585 break;
1586 case 12: /* bring specified console to the front */
1587 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1588 set_console(vc->vc_par[1] - 1);
1589 break;
1590 case 13: /* unblank the screen */
1591 poke_blanked_console();
1592 break;
1593 case 14: /* set vesa powerdown interval */
1594 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1595 break;
1596 case 15: /* activate the previous console */
1597 set_console(last_console);
1598 break;
1599 case 16: /* set cursor blink duration in msec */
1600 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1601 vc->vc_par[1] <= USHRT_MAX)
1602 vc->vc_cur_blink_ms = vc->vc_par[1];
1603 else
1604 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1605 break;
1606 }
1607}
1608
1609/* console_lock is held */
1610static void csi_at(struct vc_data *vc, unsigned int nr)
1611{
1612 if (nr > vc->vc_cols - vc->vc_x)
1613 nr = vc->vc_cols - vc->vc_x;
1614 else if (!nr)
1615 nr = 1;
1616 insert_char(vc, nr);
1617}
1618
1619/* console_lock is held */
1620static void csi_L(struct vc_data *vc, unsigned int nr)
1621{
1622 if (nr > vc->vc_rows - vc->vc_y)
1623 nr = vc->vc_rows - vc->vc_y;
1624 else if (!nr)
1625 nr = 1;
1626 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1627 vc->vc_need_wrap = 0;
1628}
1629
1630/* console_lock is held */
1631static void csi_P(struct vc_data *vc, unsigned int nr)
1632{
1633 if (nr > vc->vc_cols - vc->vc_x)
1634 nr = vc->vc_cols - vc->vc_x;
1635 else if (!nr)
1636 nr = 1;
1637 delete_char(vc, nr);
1638}
1639
1640/* console_lock is held */
1641static void csi_M(struct vc_data *vc, unsigned int nr)
1642{
1643 if (nr > vc->vc_rows - vc->vc_y)
1644 nr = vc->vc_rows - vc->vc_y;
1645 else if (!nr)
1646 nr=1;
1647 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1648 vc->vc_need_wrap = 0;
1649}
1650
1651/* console_lock is held (except via vc_init->reset_terminal */
1652static void save_cur(struct vc_data *vc)
1653{
1654 vc->vc_saved_x = vc->vc_x;
1655 vc->vc_saved_y = vc->vc_y;
1656 vc->vc_s_intensity = vc->vc_intensity;
1657 vc->vc_s_italic = vc->vc_italic;
1658 vc->vc_s_underline = vc->vc_underline;
1659 vc->vc_s_blink = vc->vc_blink;
1660 vc->vc_s_reverse = vc->vc_reverse;
1661 vc->vc_s_charset = vc->vc_charset;
1662 vc->vc_s_color = vc->vc_color;
1663 vc->vc_saved_G0 = vc->vc_G0_charset;
1664 vc->vc_saved_G1 = vc->vc_G1_charset;
1665}
1666
1667/* console_lock is held */
1668static void restore_cur(struct vc_data *vc)
1669{
1670 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1671 vc->vc_intensity = vc->vc_s_intensity;
1672 vc->vc_italic = vc->vc_s_italic;
1673 vc->vc_underline = vc->vc_s_underline;
1674 vc->vc_blink = vc->vc_s_blink;
1675 vc->vc_reverse = vc->vc_s_reverse;
1676 vc->vc_charset = vc->vc_s_charset;
1677 vc->vc_color = vc->vc_s_color;
1678 vc->vc_G0_charset = vc->vc_saved_G0;
1679 vc->vc_G1_charset = vc->vc_saved_G1;
1680 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1681 update_attr(vc);
1682 vc->vc_need_wrap = 0;
1683}
1684
1685enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1686 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1687 ESpalette, ESosc };
1688
1689/* console_lock is held (except via vc_init()) */
1690static void reset_terminal(struct vc_data *vc, int do_clear)
1691{
1692 vc->vc_top = 0;
1693 vc->vc_bottom = vc->vc_rows;
1694 vc->vc_state = ESnormal;
1695 vc->vc_ques = 0;
1696 vc->vc_translate = set_translate(LAT1_MAP, vc);
1697 vc->vc_G0_charset = LAT1_MAP;
1698 vc->vc_G1_charset = GRAF_MAP;
1699 vc->vc_charset = 0;
1700 vc->vc_need_wrap = 0;
1701 vc->vc_report_mouse = 0;
1702 vc->vc_utf = default_utf8;
1703 vc->vc_utf_count = 0;
1704
1705 vc->vc_disp_ctrl = 0;
1706 vc->vc_toggle_meta = 0;
1707
1708 vc->vc_decscnm = 0;
1709 vc->vc_decom = 0;
1710 vc->vc_decawm = 1;
1711 vc->vc_deccm = global_cursor_default;
1712 vc->vc_decim = 0;
1713
1714 vt_reset_keyboard(vc->vc_num);
1715
1716 vc->vc_cursor_type = cur_default;
1717 vc->vc_complement_mask = vc->vc_s_complement_mask;
1718
1719 default_attr(vc);
1720 update_attr(vc);
1721
1722 vc->vc_tab_stop[0] = 0x01010100;
1723 vc->vc_tab_stop[1] =
1724 vc->vc_tab_stop[2] =
1725 vc->vc_tab_stop[3] =
1726 vc->vc_tab_stop[4] =
1727 vc->vc_tab_stop[5] =
1728 vc->vc_tab_stop[6] =
1729 vc->vc_tab_stop[7] = 0x01010101;
1730
1731 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1732 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1733 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1734
1735 gotoxy(vc, 0, 0);
1736 save_cur(vc);
1737 if (do_clear)
1738 csi_J(vc, 2);
1739}
1740
1741/* console_lock is held */
1742static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1743{
1744 /*
1745 * Control characters can be used in the _middle_
1746 * of an escape sequence.
1747 */
1748 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1749 return;
1750 switch (c) {
1751 case 0:
1752 return;
1753 case 7:
1754 if (vc->vc_state == ESosc)
1755 vc->vc_state = ESnormal;
1756 else if (vc->vc_bell_duration)
1757 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1758 return;
1759 case 8:
1760 bs(vc);
1761 return;
1762 case 9:
1763 vc->vc_pos -= (vc->vc_x << 1);
1764 while (vc->vc_x < vc->vc_cols - 1) {
1765 vc->vc_x++;
1766 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1767 break;
1768 }
1769 vc->vc_pos += (vc->vc_x << 1);
1770 notify_write(vc, '\t');
1771 return;
1772 case 10: case 11: case 12:
1773 lf(vc);
1774 if (!is_kbd(vc, lnm))
1775 return;
1776 case 13:
1777 cr(vc);
1778 return;
1779 case 14:
1780 vc->vc_charset = 1;
1781 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1782 vc->vc_disp_ctrl = 1;
1783 return;
1784 case 15:
1785 vc->vc_charset = 0;
1786 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1787 vc->vc_disp_ctrl = 0;
1788 return;
1789 case 24: case 26:
1790 vc->vc_state = ESnormal;
1791 return;
1792 case 27:
1793 vc->vc_state = ESesc;
1794 return;
1795 case 127:
1796 del(vc);
1797 return;
1798 case 128+27:
1799 vc->vc_state = ESsquare;
1800 return;
1801 }
1802 switch(vc->vc_state) {
1803 case ESesc:
1804 vc->vc_state = ESnormal;
1805 switch (c) {
1806 case '[':
1807 vc->vc_state = ESsquare;
1808 return;
1809 case ']':
1810 vc->vc_state = ESnonstd;
1811 return;
1812 case '%':
1813 vc->vc_state = ESpercent;
1814 return;
1815 case 'E':
1816 cr(vc);
1817 lf(vc);
1818 return;
1819 case 'M':
1820 ri(vc);
1821 return;
1822 case 'D':
1823 lf(vc);
1824 return;
1825 case 'H':
1826 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1827 return;
1828 case 'Z':
1829 respond_ID(tty);
1830 return;
1831 case '7':
1832 save_cur(vc);
1833 return;
1834 case '8':
1835 restore_cur(vc);
1836 return;
1837 case '(':
1838 vc->vc_state = ESsetG0;
1839 return;
1840 case ')':
1841 vc->vc_state = ESsetG1;
1842 return;
1843 case '#':
1844 vc->vc_state = EShash;
1845 return;
1846 case 'c':
1847 reset_terminal(vc, 1);
1848 return;
1849 case '>': /* Numeric keypad */
1850 clr_kbd(vc, kbdapplic);
1851 return;
1852 case '=': /* Appl. keypad */
1853 set_kbd(vc, kbdapplic);
1854 return;
1855 }
1856 return;
1857 case ESnonstd:
1858 if (c=='P') { /* palette escape sequence */
1859 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1860 vc->vc_par[vc->vc_npar] = 0;
1861 vc->vc_npar = 0;
1862 vc->vc_state = ESpalette;
1863 return;
1864 } else if (c=='R') { /* reset palette */
1865 reset_palette(vc);
1866 vc->vc_state = ESnormal;
1867 } else if (c>='0' && c<='9')
1868 vc->vc_state = ESosc;
1869 else
1870 vc->vc_state = ESnormal;
1871 return;
1872 case ESpalette:
1873 if (isxdigit(c)) {
1874 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1875 if (vc->vc_npar == 7) {
1876 int i = vc->vc_par[0] * 3, j = 1;
1877 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1878 vc->vc_palette[i++] += vc->vc_par[j++];
1879 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1880 vc->vc_palette[i++] += vc->vc_par[j++];
1881 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1882 vc->vc_palette[i] += vc->vc_par[j];
1883 set_palette(vc);
1884 vc->vc_state = ESnormal;
1885 }
1886 } else
1887 vc->vc_state = ESnormal;
1888 return;
1889 case ESsquare:
1890 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1891 vc->vc_par[vc->vc_npar] = 0;
1892 vc->vc_npar = 0;
1893 vc->vc_state = ESgetpars;
1894 if (c == '[') { /* Function key */
1895 vc->vc_state=ESfunckey;
1896 return;
1897 }
1898 vc->vc_ques = (c == '?');
1899 if (vc->vc_ques)
1900 return;
1901 case ESgetpars:
1902 if (c == ';' && vc->vc_npar < NPAR - 1) {
1903 vc->vc_npar++;
1904 return;
1905 } else if (c>='0' && c<='9') {
1906 vc->vc_par[vc->vc_npar] *= 10;
1907 vc->vc_par[vc->vc_npar] += c - '0';
1908 return;
1909 }
1910 vc->vc_state = ESnormal;
1911 switch(c) {
1912 case 'h':
1913 set_mode(vc, 1);
1914 return;
1915 case 'l':
1916 set_mode(vc, 0);
1917 return;
1918 case 'c':
1919 if (vc->vc_ques) {
1920 if (vc->vc_par[0])
1921 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1922 else
1923 vc->vc_cursor_type = cur_default;
1924 return;
1925 }
1926 break;
1927 case 'm':
1928 if (vc->vc_ques) {
1929 clear_selection();
1930 if (vc->vc_par[0])
1931 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1932 else
1933 vc->vc_complement_mask = vc->vc_s_complement_mask;
1934 return;
1935 }
1936 break;
1937 case 'n':
1938 if (!vc->vc_ques) {
1939 if (vc->vc_par[0] == 5)
1940 status_report(tty);
1941 else if (vc->vc_par[0] == 6)
1942 cursor_report(vc, tty);
1943 }
1944 return;
1945 }
1946 if (vc->vc_ques) {
1947 vc->vc_ques = 0;
1948 return;
1949 }
1950 switch(c) {
1951 case 'G': case '`':
1952 if (vc->vc_par[0])
1953 vc->vc_par[0]--;
1954 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1955 return;
1956 case 'A':
1957 if (!vc->vc_par[0])
1958 vc->vc_par[0]++;
1959 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1960 return;
1961 case 'B': case 'e':
1962 if (!vc->vc_par[0])
1963 vc->vc_par[0]++;
1964 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1965 return;
1966 case 'C': case 'a':
1967 if (!vc->vc_par[0])
1968 vc->vc_par[0]++;
1969 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1970 return;
1971 case 'D':
1972 if (!vc->vc_par[0])
1973 vc->vc_par[0]++;
1974 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1975 return;
1976 case 'E':
1977 if (!vc->vc_par[0])
1978 vc->vc_par[0]++;
1979 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1980 return;
1981 case 'F':
1982 if (!vc->vc_par[0])
1983 vc->vc_par[0]++;
1984 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1985 return;
1986 case 'd':
1987 if (vc->vc_par[0])
1988 vc->vc_par[0]--;
1989 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1990 return;
1991 case 'H': case 'f':
1992 if (vc->vc_par[0])
1993 vc->vc_par[0]--;
1994 if (vc->vc_par[1])
1995 vc->vc_par[1]--;
1996 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1997 return;
1998 case 'J':
1999 csi_J(vc, vc->vc_par[0]);
2000 return;
2001 case 'K':
2002 csi_K(vc, vc->vc_par[0]);
2003 return;
2004 case 'L':
2005 csi_L(vc, vc->vc_par[0]);
2006 return;
2007 case 'M':
2008 csi_M(vc, vc->vc_par[0]);
2009 return;
2010 case 'P':
2011 csi_P(vc, vc->vc_par[0]);
2012 return;
2013 case 'c':
2014 if (!vc->vc_par[0])
2015 respond_ID(tty);
2016 return;
2017 case 'g':
2018 if (!vc->vc_par[0])
2019 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2020 else if (vc->vc_par[0] == 3) {
2021 vc->vc_tab_stop[0] =
2022 vc->vc_tab_stop[1] =
2023 vc->vc_tab_stop[2] =
2024 vc->vc_tab_stop[3] =
2025 vc->vc_tab_stop[4] =
2026 vc->vc_tab_stop[5] =
2027 vc->vc_tab_stop[6] =
2028 vc->vc_tab_stop[7] = 0;
2029 }
2030 return;
2031 case 'm':
2032 csi_m(vc);
2033 return;
2034 case 'q': /* DECLL - but only 3 leds */
2035 /* map 0,1,2,3 to 0,1,2,4 */
2036 if (vc->vc_par[0] < 4)
2037 vt_set_led_state(vc->vc_num,
2038 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2039 return;
2040 case 'r':
2041 if (!vc->vc_par[0])
2042 vc->vc_par[0]++;
2043 if (!vc->vc_par[1])
2044 vc->vc_par[1] = vc->vc_rows;
2045 /* Minimum allowed region is 2 lines */
2046 if (vc->vc_par[0] < vc->vc_par[1] &&
2047 vc->vc_par[1] <= vc->vc_rows) {
2048 vc->vc_top = vc->vc_par[0] - 1;
2049 vc->vc_bottom = vc->vc_par[1];
2050 gotoxay(vc, 0, 0);
2051 }
2052 return;
2053 case 's':
2054 save_cur(vc);
2055 return;
2056 case 'u':
2057 restore_cur(vc);
2058 return;
2059 case 'X':
2060 csi_X(vc, vc->vc_par[0]);
2061 return;
2062 case '@':
2063 csi_at(vc, vc->vc_par[0]);
2064 return;
2065 case ']': /* setterm functions */
2066 setterm_command(vc);
2067 return;
2068 }
2069 return;
2070 case ESpercent:
2071 vc->vc_state = ESnormal;
2072 switch (c) {
2073 case '@': /* defined in ISO 2022 */
2074 vc->vc_utf = 0;
2075 return;
2076 case 'G': /* prelim official escape code */
2077 case '8': /* retained for compatibility */
2078 vc->vc_utf = 1;
2079 return;
2080 }
2081 return;
2082 case ESfunckey:
2083 vc->vc_state = ESnormal;
2084 return;
2085 case EShash:
2086 vc->vc_state = ESnormal;
2087 if (c == '8') {
2088 /* DEC screen alignment test. kludge :-) */
2089 vc->vc_video_erase_char =
2090 (vc->vc_video_erase_char & 0xff00) | 'E';
2091 csi_J(vc, 2);
2092 vc->vc_video_erase_char =
2093 (vc->vc_video_erase_char & 0xff00) | ' ';
2094 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2095 }
2096 return;
2097 case ESsetG0:
2098 if (c == '0')
2099 vc->vc_G0_charset = GRAF_MAP;
2100 else if (c == 'B')
2101 vc->vc_G0_charset = LAT1_MAP;
2102 else if (c == 'U')
2103 vc->vc_G0_charset = IBMPC_MAP;
2104 else if (c == 'K')
2105 vc->vc_G0_charset = USER_MAP;
2106 if (vc->vc_charset == 0)
2107 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2108 vc->vc_state = ESnormal;
2109 return;
2110 case ESsetG1:
2111 if (c == '0')
2112 vc->vc_G1_charset = GRAF_MAP;
2113 else if (c == 'B')
2114 vc->vc_G1_charset = LAT1_MAP;
2115 else if (c == 'U')
2116 vc->vc_G1_charset = IBMPC_MAP;
2117 else if (c == 'K')
2118 vc->vc_G1_charset = USER_MAP;
2119 if (vc->vc_charset == 1)
2120 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2121 vc->vc_state = ESnormal;
2122 return;
2123 case ESosc:
2124 return;
2125 default:
2126 vc->vc_state = ESnormal;
2127 }
2128}
2129
2130/* is_double_width() is based on the wcwidth() implementation by
2131 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2132 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2133 */
2134struct interval {
2135 uint32_t first;
2136 uint32_t last;
2137};
2138
2139static int bisearch(uint32_t ucs, const struct interval *table, int max)
2140{
2141 int min = 0;
2142 int mid;
2143
2144 if (ucs < table[0].first || ucs > table[max].last)
2145 return 0;
2146 while (max >= min) {
2147 mid = (min + max) / 2;
2148 if (ucs > table[mid].last)
2149 min = mid + 1;
2150 else if (ucs < table[mid].first)
2151 max = mid - 1;
2152 else
2153 return 1;
2154 }
2155 return 0;
2156}
2157
2158static int is_double_width(uint32_t ucs)
2159{
2160 static const struct interval double_width[] = {
2161 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2162 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2163 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2164 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2165 };
2166 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2167}
2168
2169/* acquires console_lock */
2170static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2171{
2172#ifdef VT_BUF_VRAM_ONLY
2173#define FLUSH do { } while(0);
2174#else
2175#define FLUSH if (draw_x >= 0) { \
2176 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2177 draw_x = -1; \
2178 }
2179#endif
2180
2181 int c, tc, ok, n = 0, draw_x = -1;
2182 unsigned int currcons;
2183 unsigned long draw_from = 0, draw_to = 0;
2184 struct vc_data *vc;
2185 unsigned char vc_attr;
2186 struct vt_notifier_param param;
2187 uint8_t rescan;
2188 uint8_t inverse;
2189 uint8_t width;
2190 u16 himask, charmask;
2191
2192 if (in_interrupt())
2193 return count;
2194
2195 might_sleep();
2196
2197 console_lock();
2198 vc = tty->driver_data;
2199 if (vc == NULL) {
2200 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2201 console_unlock();
2202 return 0;
2203 }
2204
2205 currcons = vc->vc_num;
2206 if (!vc_cons_allocated(currcons)) {
2207 /* could this happen? */
2208 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2209 console_unlock();
2210 return 0;
2211 }
2212
2213 himask = vc->vc_hi_font_mask;
2214 charmask = himask ? 0x1ff : 0xff;
2215
2216 /* undraw cursor first */
2217 if (IS_FG(vc))
2218 hide_cursor(vc);
2219
2220 param.vc = vc;
2221
2222 while (!tty->stopped && count) {
2223 int orig = *buf;
2224 c = orig;
2225 buf++;
2226 n++;
2227 count--;
2228 rescan = 0;
2229 inverse = 0;
2230 width = 1;
2231
2232 /* Do no translation at all in control states */
2233 if (vc->vc_state != ESnormal) {
2234 tc = c;
2235 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2236 /* Combine UTF-8 into Unicode in vc_utf_char.
2237 * vc_utf_count is the number of continuation bytes still
2238 * expected to arrive.
2239 * vc_npar is the number of continuation bytes arrived so
2240 * far
2241 */
2242rescan_last_byte:
2243 if ((c & 0xc0) == 0x80) {
2244 /* Continuation byte received */
2245 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2246 if (vc->vc_utf_count) {
2247 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2248 vc->vc_npar++;
2249 if (--vc->vc_utf_count) {
2250 /* Still need some bytes */
2251 continue;
2252 }
2253 /* Got a whole character */
2254 c = vc->vc_utf_char;
2255 /* Reject overlong sequences */
2256 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2257 c > utf8_length_changes[vc->vc_npar])
2258 c = 0xfffd;
2259 } else {
2260 /* Unexpected continuation byte */
2261 vc->vc_utf_count = 0;
2262 c = 0xfffd;
2263 }
2264 } else {
2265 /* Single ASCII byte or first byte of a sequence received */
2266 if (vc->vc_utf_count) {
2267 /* Continuation byte expected */
2268 rescan = 1;
2269 vc->vc_utf_count = 0;
2270 c = 0xfffd;
2271 } else if (c > 0x7f) {
2272 /* First byte of a multibyte sequence received */
2273 vc->vc_npar = 0;
2274 if ((c & 0xe0) == 0xc0) {
2275 vc->vc_utf_count = 1;
2276 vc->vc_utf_char = (c & 0x1f);
2277 } else if ((c & 0xf0) == 0xe0) {
2278 vc->vc_utf_count = 2;
2279 vc->vc_utf_char = (c & 0x0f);
2280 } else if ((c & 0xf8) == 0xf0) {
2281 vc->vc_utf_count = 3;
2282 vc->vc_utf_char = (c & 0x07);
2283 } else if ((c & 0xfc) == 0xf8) {
2284 vc->vc_utf_count = 4;
2285 vc->vc_utf_char = (c & 0x03);
2286 } else if ((c & 0xfe) == 0xfc) {
2287 vc->vc_utf_count = 5;
2288 vc->vc_utf_char = (c & 0x01);
2289 } else {
2290 /* 254 and 255 are invalid */
2291 c = 0xfffd;
2292 }
2293 if (vc->vc_utf_count) {
2294 /* Still need some bytes */
2295 continue;
2296 }
2297 }
2298 /* Nothing to do if an ASCII byte was received */
2299 }
2300 /* End of UTF-8 decoding. */
2301 /* c is the received character, or U+FFFD for invalid sequences. */
2302 /* Replace invalid Unicode code points with U+FFFD too */
2303 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2304 c = 0xfffd;
2305 tc = c;
2306 } else { /* no utf or alternate charset mode */
2307 tc = vc_translate(vc, c);
2308 }
2309
2310 param.c = tc;
2311 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2312 ¶m) == NOTIFY_STOP)
2313 continue;
2314
2315 /* If the original code was a control character we
2316 * only allow a glyph to be displayed if the code is
2317 * not normally used (such as for cursor movement) or
2318 * if the disp_ctrl mode has been explicitly enabled.
2319 * Certain characters (as given by the CTRL_ALWAYS
2320 * bitmap) are always displayed as control characters,
2321 * as the console would be pretty useless without
2322 * them; to display an arbitrary font position use the
2323 * direct-to-font zone in UTF-8 mode.
2324 */
2325 ok = tc && (c >= 32 ||
2326 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2327 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2328 && (c != 127 || vc->vc_disp_ctrl)
2329 && (c != 128+27);
2330
2331 if (vc->vc_state == ESnormal && ok) {
2332 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2333 if (is_double_width(c))
2334 width = 2;
2335 }
2336 /* Now try to find out how to display it */
2337 tc = conv_uni_to_pc(vc, tc);
2338 if (tc & ~charmask) {
2339 if (tc == -1 || tc == -2) {
2340 continue; /* nothing to display */
2341 }
2342 /* Glyph not found */
2343 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2344 /* In legacy mode use the glyph we get by a 1:1 mapping.
2345 This would make absolutely no sense with Unicode in mind,
2346 but do this for ASCII characters since a font may lack
2347 Unicode mapping info and we don't want to end up with
2348 having question marks only. */
2349 tc = c;
2350 } else {
2351 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2352 tc = conv_uni_to_pc(vc, 0xfffd);
2353 if (tc < 0) {
2354 inverse = 1;
2355 tc = conv_uni_to_pc(vc, '?');
2356 if (tc < 0) tc = '?';
2357 }
2358 }
2359 }
2360
2361 if (!inverse) {
2362 vc_attr = vc->vc_attr;
2363 } else {
2364 /* invert vc_attr */
2365 if (!vc->vc_can_do_color) {
2366 vc_attr = (vc->vc_attr) ^ 0x08;
2367 } else if (vc->vc_hi_font_mask == 0x100) {
2368 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2369 } else {
2370 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2371 }
2372 FLUSH
2373 }
2374
2375 while (1) {
2376 if (vc->vc_need_wrap || vc->vc_decim)
2377 FLUSH
2378 if (vc->vc_need_wrap) {
2379 cr(vc);
2380 lf(vc);
2381 }
2382 if (vc->vc_decim)
2383 insert_char(vc, 1);
2384 scr_writew(himask ?
2385 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2386 (vc_attr << 8) + tc,
2387 (u16 *) vc->vc_pos);
2388 if (DO_UPDATE(vc) && draw_x < 0) {
2389 draw_x = vc->vc_x;
2390 draw_from = vc->vc_pos;
2391 }
2392 if (vc->vc_x == vc->vc_cols - 1) {
2393 vc->vc_need_wrap = vc->vc_decawm;
2394 draw_to = vc->vc_pos + 2;
2395 } else {
2396 vc->vc_x++;
2397 draw_to = (vc->vc_pos += 2);
2398 }
2399
2400 if (!--width) break;
2401
2402 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2403 if (tc < 0) tc = ' ';
2404 }
2405 notify_write(vc, c);
2406
2407 if (inverse) {
2408 FLUSH
2409 }
2410
2411 if (rescan) {
2412 rescan = 0;
2413 inverse = 0;
2414 width = 1;
2415 c = orig;
2416 goto rescan_last_byte;
2417 }
2418 continue;
2419 }
2420 FLUSH
2421 do_con_trol(tty, vc, orig);
2422 }
2423 FLUSH
2424 console_conditional_schedule();
2425 console_unlock();
2426 notify_update(vc);
2427 return n;
2428#undef FLUSH
2429}
2430
2431/*
2432 * This is the console switching callback.
2433 *
2434 * Doing console switching in a process context allows
2435 * us to do the switches asynchronously (needed when we want
2436 * to switch due to a keyboard interrupt). Synchronization
2437 * with other console code and prevention of re-entrancy is
2438 * ensured with console_lock.
2439 */
2440static void console_callback(struct work_struct *ignored)
2441{
2442 console_lock();
2443
2444 if (want_console >= 0) {
2445 if (want_console != fg_console &&
2446 vc_cons_allocated(want_console)) {
2447 hide_cursor(vc_cons[fg_console].d);
2448 change_console(vc_cons[want_console].d);
2449 /* we only changed when the console had already
2450 been allocated - a new console is not created
2451 in an interrupt routine */
2452 }
2453 want_console = -1;
2454 }
2455 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2456 do_poke_blanked_console = 0;
2457 poke_blanked_console();
2458 }
2459 if (scrollback_delta) {
2460 struct vc_data *vc = vc_cons[fg_console].d;
2461 clear_selection();
2462 if (vc->vc_mode == KD_TEXT)
2463 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2464 scrollback_delta = 0;
2465 }
2466 if (blank_timer_expired) {
2467 do_blank_screen(0);
2468 blank_timer_expired = 0;
2469 }
2470 notify_update(vc_cons[fg_console].d);
2471
2472 console_unlock();
2473}
2474
2475int set_console(int nr)
2476{
2477 struct vc_data *vc = vc_cons[fg_console].d;
2478
2479 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2480 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2481
2482 /*
2483 * Console switch will fail in console_callback() or
2484 * change_console() so there is no point scheduling
2485 * the callback
2486 *
2487 * Existing set_console() users don't check the return
2488 * value so this shouldn't break anything
2489 */
2490 return -EINVAL;
2491 }
2492
2493 want_console = nr;
2494 schedule_console_callback();
2495
2496 return 0;
2497}
2498
2499struct tty_driver *console_driver;
2500
2501#ifdef CONFIG_VT_CONSOLE
2502
2503/**
2504 * vt_kmsg_redirect() - Sets/gets the kernel message console
2505 * @new: The new virtual terminal number or -1 if the console should stay
2506 * unchanged
2507 *
2508 * By default, the kernel messages are always printed on the current virtual
2509 * console. However, the user may modify that default with the
2510 * TIOCL_SETKMSGREDIRECT ioctl call.
2511 *
2512 * This function sets the kernel message console to be @new. It returns the old
2513 * virtual console number. The virtual terminal number 0 (both as parameter and
2514 * return value) means no redirection (i.e. always printed on the currently
2515 * active console).
2516 *
2517 * The parameter -1 means that only the current console is returned, but the
2518 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2519 * case to make the code more understandable.
2520 *
2521 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2522 * the parameter and always returns 0.
2523 */
2524int vt_kmsg_redirect(int new)
2525{
2526 static int kmsg_con;
2527
2528 if (new != -1)
2529 return xchg(&kmsg_con, new);
2530 else
2531 return kmsg_con;
2532}
2533
2534/*
2535 * Console on virtual terminal
2536 *
2537 * The console must be locked when we get here.
2538 */
2539
2540static void vt_console_print(struct console *co, const char *b, unsigned count)
2541{
2542 struct vc_data *vc = vc_cons[fg_console].d;
2543 unsigned char c;
2544 static DEFINE_SPINLOCK(printing_lock);
2545 const ushort *start;
2546 ushort cnt = 0;
2547 ushort myx;
2548 int kmsg_console;
2549
2550 /* console busy or not yet initialized */
2551 if (!printable)
2552 return;
2553 if (!spin_trylock(&printing_lock))
2554 return;
2555
2556 kmsg_console = vt_get_kmsg_redirect();
2557 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2558 vc = vc_cons[kmsg_console - 1].d;
2559
2560 /* read `x' only after setting currcons properly (otherwise
2561 the `x' macro will read the x of the foreground console). */
2562 myx = vc->vc_x;
2563
2564 if (!vc_cons_allocated(fg_console)) {
2565 /* impossible */
2566 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2567 goto quit;
2568 }
2569
2570 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2571 goto quit;
2572
2573 /* undraw cursor first */
2574 if (IS_FG(vc))
2575 hide_cursor(vc);
2576
2577 start = (ushort *)vc->vc_pos;
2578
2579 /* Contrived structure to try to emulate original need_wrap behaviour
2580 * Problems caused when we have need_wrap set on '\n' character */
2581 while (count--) {
2582 c = *b++;
2583 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2584 if (cnt > 0) {
2585 if (CON_IS_VISIBLE(vc))
2586 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2587 vc->vc_x += cnt;
2588 if (vc->vc_need_wrap)
2589 vc->vc_x--;
2590 cnt = 0;
2591 }
2592 if (c == 8) { /* backspace */
2593 bs(vc);
2594 start = (ushort *)vc->vc_pos;
2595 myx = vc->vc_x;
2596 continue;
2597 }
2598 if (c != 13)
2599 lf(vc);
2600 cr(vc);
2601 start = (ushort *)vc->vc_pos;
2602 myx = vc->vc_x;
2603 if (c == 10 || c == 13)
2604 continue;
2605 }
2606 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2607 notify_write(vc, c);
2608 cnt++;
2609 if (myx == vc->vc_cols - 1) {
2610 vc->vc_need_wrap = 1;
2611 continue;
2612 }
2613 vc->vc_pos += 2;
2614 myx++;
2615 }
2616 if (cnt > 0) {
2617 if (CON_IS_VISIBLE(vc))
2618 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2619 vc->vc_x += cnt;
2620 if (vc->vc_x == vc->vc_cols) {
2621 vc->vc_x--;
2622 vc->vc_need_wrap = 1;
2623 }
2624 }
2625 set_cursor(vc);
2626 notify_update(vc);
2627
2628quit:
2629 spin_unlock(&printing_lock);
2630}
2631
2632static struct tty_driver *vt_console_device(struct console *c, int *index)
2633{
2634 *index = c->index ? c->index-1 : fg_console;
2635 return console_driver;
2636}
2637
2638static struct console vt_console_driver = {
2639 .name = "tty",
2640 .write = vt_console_print,
2641 .device = vt_console_device,
2642 .unblank = unblank_screen,
2643 .flags = CON_PRINTBUFFER,
2644 .index = -1,
2645};
2646#endif
2647
2648/*
2649 * Handling of Linux-specific VC ioctls
2650 */
2651
2652/*
2653 * Generally a bit racy with respect to console_lock();.
2654 *
2655 * There are some functions which don't need it.
2656 *
2657 * There are some functions which can sleep for arbitrary periods
2658 * (paste_selection) but we don't need the lock there anyway.
2659 *
2660 * set_selection has locking, and definitely needs it
2661 */
2662
2663int tioclinux(struct tty_struct *tty, unsigned long arg)
2664{
2665 char type, data;
2666 char __user *p = (char __user *)arg;
2667 int lines;
2668 int ret;
2669
2670 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2671 return -EPERM;
2672 if (get_user(type, p))
2673 return -EFAULT;
2674 ret = 0;
2675
2676 switch (type)
2677 {
2678 case TIOCL_SETSEL:
2679 console_lock();
2680 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2681 console_unlock();
2682 break;
2683 case TIOCL_PASTESEL:
2684 ret = paste_selection(tty);
2685 break;
2686 case TIOCL_UNBLANKSCREEN:
2687 console_lock();
2688 unblank_screen();
2689 console_unlock();
2690 break;
2691 case TIOCL_SELLOADLUT:
2692 console_lock();
2693 ret = sel_loadlut(p);
2694 console_unlock();
2695 break;
2696 case TIOCL_GETSHIFTSTATE:
2697
2698 /*
2699 * Make it possible to react to Shift+Mousebutton.
2700 * Note that 'shift_state' is an undocumented
2701 * kernel-internal variable; programs not closely
2702 * related to the kernel should not use this.
2703 */
2704 data = vt_get_shift_state();
2705 ret = __put_user(data, p);
2706 break;
2707 case TIOCL_GETMOUSEREPORTING:
2708 console_lock(); /* May be overkill */
2709 data = mouse_reporting();
2710 console_unlock();
2711 ret = __put_user(data, p);
2712 break;
2713 case TIOCL_SETVESABLANK:
2714 console_lock();
2715 ret = set_vesa_blanking(p);
2716 console_unlock();
2717 break;
2718 case TIOCL_GETKMSGREDIRECT:
2719 data = vt_get_kmsg_redirect();
2720 ret = __put_user(data, p);
2721 break;
2722 case TIOCL_SETKMSGREDIRECT:
2723 if (!capable(CAP_SYS_ADMIN)) {
2724 ret = -EPERM;
2725 } else {
2726 if (get_user(data, p+1))
2727 ret = -EFAULT;
2728 else
2729 vt_kmsg_redirect(data);
2730 }
2731 break;
2732 case TIOCL_GETFGCONSOLE:
2733 /* No locking needed as this is a transiently
2734 correct return anyway if the caller hasn't
2735 disabled switching */
2736 ret = fg_console;
2737 break;
2738 case TIOCL_SCROLLCONSOLE:
2739 if (get_user(lines, (s32 __user *)(p+4))) {
2740 ret = -EFAULT;
2741 } else {
2742 /* Need the console lock here. Note that lots
2743 of other calls need fixing before the lock
2744 is actually useful ! */
2745 console_lock();
2746 scrollfront(vc_cons[fg_console].d, lines);
2747 console_unlock();
2748 ret = 0;
2749 }
2750 break;
2751 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2752 console_lock();
2753 ignore_poke = 1;
2754 do_blank_screen(0);
2755 console_unlock();
2756 break;
2757 case TIOCL_BLANKEDSCREEN:
2758 ret = console_blanked;
2759 break;
2760 default:
2761 ret = -EINVAL;
2762 break;
2763 }
2764 return ret;
2765}
2766
2767/*
2768 * /dev/ttyN handling
2769 */
2770
2771static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2772{
2773 int retval;
2774
2775 retval = do_con_write(tty, buf, count);
2776 con_flush_chars(tty);
2777
2778 return retval;
2779}
2780
2781static int con_put_char(struct tty_struct *tty, unsigned char ch)
2782{
2783 if (in_interrupt())
2784 return 0; /* n_r3964 calls put_char() from interrupt context */
2785 return do_con_write(tty, &ch, 1);
2786}
2787
2788static int con_write_room(struct tty_struct *tty)
2789{
2790 if (tty->stopped)
2791 return 0;
2792 return 32768; /* No limit, really; we're not buffering */
2793}
2794
2795static int con_chars_in_buffer(struct tty_struct *tty)
2796{
2797 return 0; /* we're not buffering */
2798}
2799
2800/*
2801 * con_throttle and con_unthrottle are only used for
2802 * paste_selection(), which has to stuff in a large number of
2803 * characters...
2804 */
2805static void con_throttle(struct tty_struct *tty)
2806{
2807}
2808
2809static void con_unthrottle(struct tty_struct *tty)
2810{
2811 struct vc_data *vc = tty->driver_data;
2812
2813 wake_up_interruptible(&vc->paste_wait);
2814}
2815
2816/*
2817 * Turn the Scroll-Lock LED on when the tty is stopped
2818 */
2819static void con_stop(struct tty_struct *tty)
2820{
2821 int console_num;
2822 if (!tty)
2823 return;
2824 console_num = tty->index;
2825 if (!vc_cons_allocated(console_num))
2826 return;
2827 vt_kbd_con_stop(console_num);
2828}
2829
2830/*
2831 * Turn the Scroll-Lock LED off when the console is started
2832 */
2833static void con_start(struct tty_struct *tty)
2834{
2835 int console_num;
2836 if (!tty)
2837 return;
2838 console_num = tty->index;
2839 if (!vc_cons_allocated(console_num))
2840 return;
2841 vt_kbd_con_start(console_num);
2842}
2843
2844static void con_flush_chars(struct tty_struct *tty)
2845{
2846 struct vc_data *vc;
2847
2848 if (in_interrupt()) /* from flush_to_ldisc */
2849 return;
2850
2851 /* if we race with con_close(), vt may be null */
2852 console_lock();
2853 vc = tty->driver_data;
2854 if (vc)
2855 set_cursor(vc);
2856 console_unlock();
2857}
2858
2859/*
2860 * Allocate the console screen memory.
2861 */
2862static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2863{
2864 unsigned int currcons = tty->index;
2865 struct vc_data *vc;
2866 int ret;
2867
2868 console_lock();
2869 ret = vc_allocate(currcons);
2870 if (ret)
2871 goto unlock;
2872
2873 vc = vc_cons[currcons].d;
2874
2875 /* Still being freed */
2876 if (vc->port.tty) {
2877 ret = -ERESTARTSYS;
2878 goto unlock;
2879 }
2880
2881 ret = tty_port_install(&vc->port, driver, tty);
2882 if (ret)
2883 goto unlock;
2884
2885 tty->driver_data = vc;
2886 vc->port.tty = tty;
2887
2888 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2889 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2890 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2891 }
2892 if (vc->vc_utf)
2893 tty->termios.c_iflag |= IUTF8;
2894 else
2895 tty->termios.c_iflag &= ~IUTF8;
2896unlock:
2897 console_unlock();
2898 return ret;
2899}
2900
2901static int con_open(struct tty_struct *tty, struct file *filp)
2902{
2903 /* everything done in install */
2904 return 0;
2905}
2906
2907
2908static void con_close(struct tty_struct *tty, struct file *filp)
2909{
2910 /* Nothing to do - we defer to shutdown */
2911}
2912
2913static void con_shutdown(struct tty_struct *tty)
2914{
2915 struct vc_data *vc = tty->driver_data;
2916 BUG_ON(vc == NULL);
2917 console_lock();
2918 vc->port.tty = NULL;
2919 console_unlock();
2920}
2921
2922static int default_color = 7; /* white */
2923static int default_italic_color = 2; // green (ASCII)
2924static int default_underline_color = 3; // cyan (ASCII)
2925module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2926module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2927module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2928
2929static void vc_init(struct vc_data *vc, unsigned int rows,
2930 unsigned int cols, int do_clear)
2931{
2932 int j, k ;
2933
2934 vc->vc_cols = cols;
2935 vc->vc_rows = rows;
2936 vc->vc_size_row = cols << 1;
2937 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2938
2939 set_origin(vc);
2940 vc->vc_pos = vc->vc_origin;
2941 reset_vc(vc);
2942 for (j=k=0; j<16; j++) {
2943 vc->vc_palette[k++] = default_red[j] ;
2944 vc->vc_palette[k++] = default_grn[j] ;
2945 vc->vc_palette[k++] = default_blu[j] ;
2946 }
2947 vc->vc_def_color = default_color;
2948 vc->vc_ulcolor = default_underline_color;
2949 vc->vc_itcolor = default_italic_color;
2950 vc->vc_halfcolor = 0x08; /* grey */
2951 init_waitqueue_head(&vc->paste_wait);
2952 reset_terminal(vc, do_clear);
2953}
2954
2955/*
2956 * This routine initializes console interrupts, and does nothing
2957 * else. If you want the screen to clear, call tty_write with
2958 * the appropriate escape-sequence.
2959 */
2960
2961static int __init con_init(void)
2962{
2963 const char *display_desc = NULL;
2964 struct vc_data *vc;
2965 unsigned int currcons = 0, i;
2966
2967 console_lock();
2968
2969 if (conswitchp)
2970 display_desc = conswitchp->con_startup();
2971 if (!display_desc) {
2972 fg_console = 0;
2973 console_unlock();
2974 return 0;
2975 }
2976
2977 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2978 struct con_driver *con_driver = ®istered_con_driver[i];
2979
2980 if (con_driver->con == NULL) {
2981 con_driver->con = conswitchp;
2982 con_driver->desc = display_desc;
2983 con_driver->flag = CON_DRIVER_FLAG_INIT;
2984 con_driver->first = 0;
2985 con_driver->last = MAX_NR_CONSOLES - 1;
2986 break;
2987 }
2988 }
2989
2990 for (i = 0; i < MAX_NR_CONSOLES; i++)
2991 con_driver_map[i] = conswitchp;
2992
2993 if (blankinterval) {
2994 blank_state = blank_normal_wait;
2995 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2996 }
2997
2998 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2999 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3000 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3001 tty_port_init(&vc->port);
3002 visual_init(vc, currcons, 1);
3003 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3004 vc_init(vc, vc->vc_rows, vc->vc_cols,
3005 currcons || !vc->vc_sw->con_save_screen);
3006 }
3007 currcons = fg_console = 0;
3008 master_display_fg = vc = vc_cons[currcons].d;
3009 set_origin(vc);
3010 save_screen(vc);
3011 gotoxy(vc, vc->vc_x, vc->vc_y);
3012 csi_J(vc, 0);
3013 update_screen(vc);
3014 pr_info("Console: %s %s %dx%d\n",
3015 vc->vc_can_do_color ? "colour" : "mono",
3016 display_desc, vc->vc_cols, vc->vc_rows);
3017 printable = 1;
3018
3019 console_unlock();
3020
3021#ifdef CONFIG_VT_CONSOLE
3022 register_console(&vt_console_driver);
3023#endif
3024 return 0;
3025}
3026console_initcall(con_init);
3027
3028static const struct tty_operations con_ops = {
3029 .install = con_install,
3030 .open = con_open,
3031 .close = con_close,
3032 .write = con_write,
3033 .write_room = con_write_room,
3034 .put_char = con_put_char,
3035 .flush_chars = con_flush_chars,
3036 .chars_in_buffer = con_chars_in_buffer,
3037 .ioctl = vt_ioctl,
3038#ifdef CONFIG_COMPAT
3039 .compat_ioctl = vt_compat_ioctl,
3040#endif
3041 .stop = con_stop,
3042 .start = con_start,
3043 .throttle = con_throttle,
3044 .unthrottle = con_unthrottle,
3045 .resize = vt_resize,
3046 .shutdown = con_shutdown
3047};
3048
3049static struct cdev vc0_cdev;
3050
3051static ssize_t show_tty_active(struct device *dev,
3052 struct device_attribute *attr, char *buf)
3053{
3054 return sprintf(buf, "tty%d\n", fg_console + 1);
3055}
3056static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3057
3058static struct attribute *vt_dev_attrs[] = {
3059 &dev_attr_active.attr,
3060 NULL
3061};
3062
3063ATTRIBUTE_GROUPS(vt_dev);
3064
3065int __init vty_init(const struct file_operations *console_fops)
3066{
3067 cdev_init(&vc0_cdev, console_fops);
3068 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3069 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3070 panic("Couldn't register /dev/tty0 driver\n");
3071 tty0dev = device_create_with_groups(tty_class, NULL,
3072 MKDEV(TTY_MAJOR, 0), NULL,
3073 vt_dev_groups, "tty0");
3074 if (IS_ERR(tty0dev))
3075 tty0dev = NULL;
3076
3077 vcs_init();
3078
3079 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3080 if (!console_driver)
3081 panic("Couldn't allocate console driver\n");
3082
3083 console_driver->name = "tty";
3084 console_driver->name_base = 1;
3085 console_driver->major = TTY_MAJOR;
3086 console_driver->minor_start = 1;
3087 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3088 console_driver->init_termios = tty_std_termios;
3089 if (default_utf8)
3090 console_driver->init_termios.c_iflag |= IUTF8;
3091 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3092 tty_set_operations(console_driver, &con_ops);
3093 if (tty_register_driver(console_driver))
3094 panic("Couldn't register console driver\n");
3095 kbd_init();
3096 console_map_init();
3097#ifdef CONFIG_MDA_CONSOLE
3098 mda_console_init();
3099#endif
3100 return 0;
3101}
3102
3103#ifndef VT_SINGLE_DRIVER
3104
3105static struct class *vtconsole_class;
3106
3107static int do_bind_con_driver(const struct consw *csw, int first, int last,
3108 int deflt)
3109{
3110 struct module *owner = csw->owner;
3111 const char *desc = NULL;
3112 struct con_driver *con_driver;
3113 int i, j = -1, k = -1, retval = -ENODEV;
3114
3115 if (!try_module_get(owner))
3116 return -ENODEV;
3117
3118 WARN_CONSOLE_UNLOCKED();
3119
3120 /* check if driver is registered */
3121 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3122 con_driver = ®istered_con_driver[i];
3123
3124 if (con_driver->con == csw) {
3125 desc = con_driver->desc;
3126 retval = 0;
3127 break;
3128 }
3129 }
3130
3131 if (retval)
3132 goto err;
3133
3134 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3135 csw->con_startup();
3136 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3137 }
3138
3139 if (deflt) {
3140 if (conswitchp)
3141 module_put(conswitchp->owner);
3142
3143 __module_get(owner);
3144 conswitchp = csw;
3145 }
3146
3147 first = max(first, con_driver->first);
3148 last = min(last, con_driver->last);
3149
3150 for (i = first; i <= last; i++) {
3151 int old_was_color;
3152 struct vc_data *vc = vc_cons[i].d;
3153
3154 if (con_driver_map[i])
3155 module_put(con_driver_map[i]->owner);
3156 __module_get(owner);
3157 con_driver_map[i] = csw;
3158
3159 if (!vc || !vc->vc_sw)
3160 continue;
3161
3162 j = i;
3163
3164 if (CON_IS_VISIBLE(vc)) {
3165 k = i;
3166 save_screen(vc);
3167 }
3168
3169 old_was_color = vc->vc_can_do_color;
3170 vc->vc_sw->con_deinit(vc);
3171 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3172 visual_init(vc, i, 0);
3173 set_origin(vc);
3174 update_attr(vc);
3175
3176 /* If the console changed between mono <-> color, then
3177 * the attributes in the screenbuf will be wrong. The
3178 * following resets all attributes to something sane.
3179 */
3180 if (old_was_color != vc->vc_can_do_color)
3181 clear_buffer_attributes(vc);
3182 }
3183
3184 pr_info("Console: switching ");
3185 if (!deflt)
3186 printk("consoles %d-%d ", first+1, last+1);
3187 if (j >= 0) {
3188 struct vc_data *vc = vc_cons[j].d;
3189
3190 printk("to %s %s %dx%d\n",
3191 vc->vc_can_do_color ? "colour" : "mono",
3192 desc, vc->vc_cols, vc->vc_rows);
3193
3194 if (k >= 0) {
3195 vc = vc_cons[k].d;
3196 update_screen(vc);
3197 }
3198 } else
3199 printk("to %s\n", desc);
3200
3201 retval = 0;
3202err:
3203 module_put(owner);
3204 return retval;
3205};
3206
3207
3208#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3209/* unlocked version of unbind_con_driver() */
3210int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3211{
3212 struct module *owner = csw->owner;
3213 const struct consw *defcsw = NULL;
3214 struct con_driver *con_driver = NULL, *con_back = NULL;
3215 int i, retval = -ENODEV;
3216
3217 if (!try_module_get(owner))
3218 return -ENODEV;
3219
3220 WARN_CONSOLE_UNLOCKED();
3221
3222 /* check if driver is registered and if it is unbindable */
3223 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3224 con_driver = ®istered_con_driver[i];
3225
3226 if (con_driver->con == csw &&
3227 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3228 retval = 0;
3229 break;
3230 }
3231 }
3232
3233 if (retval)
3234 goto err;
3235
3236 retval = -ENODEV;
3237
3238 /* check if backup driver exists */
3239 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3240 con_back = ®istered_con_driver[i];
3241
3242 if (con_back->con && con_back->con != csw) {
3243 defcsw = con_back->con;
3244 retval = 0;
3245 break;
3246 }
3247 }
3248
3249 if (retval)
3250 goto err;
3251
3252 if (!con_is_bound(csw))
3253 goto err;
3254
3255 first = max(first, con_driver->first);
3256 last = min(last, con_driver->last);
3257
3258 for (i = first; i <= last; i++) {
3259 if (con_driver_map[i] == csw) {
3260 module_put(csw->owner);
3261 con_driver_map[i] = NULL;
3262 }
3263 }
3264
3265 if (!con_is_bound(defcsw)) {
3266 const struct consw *defconsw = conswitchp;
3267
3268 defcsw->con_startup();
3269 con_back->flag |= CON_DRIVER_FLAG_INIT;
3270 /*
3271 * vgacon may change the default driver to point
3272 * to dummycon, we restore it here...
3273 */
3274 conswitchp = defconsw;
3275 }
3276
3277 if (!con_is_bound(csw))
3278 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3279
3280 /* ignore return value, binding should not fail */
3281 do_bind_con_driver(defcsw, first, last, deflt);
3282err:
3283 module_put(owner);
3284 return retval;
3285
3286}
3287EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3288
3289static int vt_bind(struct con_driver *con)
3290{
3291 const struct consw *defcsw = NULL, *csw = NULL;
3292 int i, more = 1, first = -1, last = -1, deflt = 0;
3293
3294 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3295 goto err;
3296
3297 csw = con->con;
3298
3299 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3300 struct con_driver *con = ®istered_con_driver[i];
3301
3302 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3303 defcsw = con->con;
3304 break;
3305 }
3306 }
3307
3308 if (!defcsw)
3309 goto err;
3310
3311 while (more) {
3312 more = 0;
3313
3314 for (i = con->first; i <= con->last; i++) {
3315 if (con_driver_map[i] == defcsw) {
3316 if (first == -1)
3317 first = i;
3318 last = i;
3319 more = 1;
3320 } else if (first != -1)
3321 break;
3322 }
3323
3324 if (first == 0 && last == MAX_NR_CONSOLES -1)
3325 deflt = 1;
3326
3327 if (first != -1)
3328 do_bind_con_driver(csw, first, last, deflt);
3329
3330 first = -1;
3331 last = -1;
3332 deflt = 0;
3333 }
3334
3335err:
3336 return 0;
3337}
3338
3339static int vt_unbind(struct con_driver *con)
3340{
3341 const struct consw *csw = NULL;
3342 int i, more = 1, first = -1, last = -1, deflt = 0;
3343 int ret;
3344
3345 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3346 goto err;
3347
3348 csw = con->con;
3349
3350 while (more) {
3351 more = 0;
3352
3353 for (i = con->first; i <= con->last; i++) {
3354 if (con_driver_map[i] == csw) {
3355 if (first == -1)
3356 first = i;
3357 last = i;
3358 more = 1;
3359 } else if (first != -1)
3360 break;
3361 }
3362
3363 if (first == 0 && last == MAX_NR_CONSOLES -1)
3364 deflt = 1;
3365
3366 if (first != -1) {
3367 ret = do_unbind_con_driver(csw, first, last, deflt);
3368 if (ret != 0)
3369 return ret;
3370 }
3371
3372 first = -1;
3373 last = -1;
3374 deflt = 0;
3375 }
3376
3377err:
3378 return 0;
3379}
3380#else
3381static inline int vt_bind(struct con_driver *con)
3382{
3383 return 0;
3384}
3385static inline int vt_unbind(struct con_driver *con)
3386{
3387 return 0;
3388}
3389#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3390
3391static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3392 const char *buf, size_t count)
3393{
3394 struct con_driver *con = dev_get_drvdata(dev);
3395 int bind = simple_strtoul(buf, NULL, 0);
3396
3397 console_lock();
3398
3399 if (bind)
3400 vt_bind(con);
3401 else
3402 vt_unbind(con);
3403
3404 console_unlock();
3405
3406 return count;
3407}
3408
3409static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3410 char *buf)
3411{
3412 struct con_driver *con = dev_get_drvdata(dev);
3413 int bind = con_is_bound(con->con);
3414
3415 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3416}
3417
3418static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3419 char *buf)
3420{
3421 struct con_driver *con = dev_get_drvdata(dev);
3422
3423 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3424 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3425 con->desc);
3426
3427}
3428
3429static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3430static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3431
3432static struct attribute *con_dev_attrs[] = {
3433 &dev_attr_bind.attr,
3434 &dev_attr_name.attr,
3435 NULL
3436};
3437
3438ATTRIBUTE_GROUPS(con_dev);
3439
3440static int vtconsole_init_device(struct con_driver *con)
3441{
3442 con->flag |= CON_DRIVER_FLAG_ATTR;
3443 return 0;
3444}
3445
3446static void vtconsole_deinit_device(struct con_driver *con)
3447{
3448 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3449}
3450
3451/**
3452 * con_is_bound - checks if driver is bound to the console
3453 * @csw: console driver
3454 *
3455 * RETURNS: zero if unbound, nonzero if bound
3456 *
3457 * Drivers can call this and if zero, they should release
3458 * all resources allocated on con_startup()
3459 */
3460int con_is_bound(const struct consw *csw)
3461{
3462 int i, bound = 0;
3463
3464 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3465 if (con_driver_map[i] == csw) {
3466 bound = 1;
3467 break;
3468 }
3469 }
3470
3471 return bound;
3472}
3473EXPORT_SYMBOL(con_is_bound);
3474
3475/**
3476 * con_debug_enter - prepare the console for the kernel debugger
3477 * @sw: console driver
3478 *
3479 * Called when the console is taken over by the kernel debugger, this
3480 * function needs to save the current console state, then put the console
3481 * into a state suitable for the kernel debugger.
3482 *
3483 * RETURNS:
3484 * Zero on success, nonzero if a failure occurred when trying to prepare
3485 * the console for the debugger.
3486 */
3487int con_debug_enter(struct vc_data *vc)
3488{
3489 int ret = 0;
3490
3491 saved_fg_console = fg_console;
3492 saved_last_console = last_console;
3493 saved_want_console = want_console;
3494 saved_vc_mode = vc->vc_mode;
3495 saved_console_blanked = console_blanked;
3496 vc->vc_mode = KD_TEXT;
3497 console_blanked = 0;
3498 if (vc->vc_sw->con_debug_enter)
3499 ret = vc->vc_sw->con_debug_enter(vc);
3500#ifdef CONFIG_KGDB_KDB
3501 /* Set the initial LINES variable if it is not already set */
3502 if (vc->vc_rows < 999) {
3503 int linecount;
3504 char lns[4];
3505 const char *setargs[3] = {
3506 "set",
3507 "LINES",
3508 lns,
3509 };
3510 if (kdbgetintenv(setargs[0], &linecount)) {
3511 snprintf(lns, 4, "%i", vc->vc_rows);
3512 kdb_set(2, setargs);
3513 }
3514 }
3515 if (vc->vc_cols < 999) {
3516 int colcount;
3517 char cols[4];
3518 const char *setargs[3] = {
3519 "set",
3520 "COLUMNS",
3521 cols,
3522 };
3523 if (kdbgetintenv(setargs[0], &colcount)) {
3524 snprintf(cols, 4, "%i", vc->vc_cols);
3525 kdb_set(2, setargs);
3526 }
3527 }
3528#endif /* CONFIG_KGDB_KDB */
3529 return ret;
3530}
3531EXPORT_SYMBOL_GPL(con_debug_enter);
3532
3533/**
3534 * con_debug_leave - restore console state
3535 * @sw: console driver
3536 *
3537 * Restore the console state to what it was before the kernel debugger
3538 * was invoked.
3539 *
3540 * RETURNS:
3541 * Zero on success, nonzero if a failure occurred when trying to restore
3542 * the console.
3543 */
3544int con_debug_leave(void)
3545{
3546 struct vc_data *vc;
3547 int ret = 0;
3548
3549 fg_console = saved_fg_console;
3550 last_console = saved_last_console;
3551 want_console = saved_want_console;
3552 console_blanked = saved_console_blanked;
3553 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3554
3555 vc = vc_cons[fg_console].d;
3556 if (vc->vc_sw->con_debug_leave)
3557 ret = vc->vc_sw->con_debug_leave(vc);
3558 return ret;
3559}
3560EXPORT_SYMBOL_GPL(con_debug_leave);
3561
3562static int do_register_con_driver(const struct consw *csw, int first, int last)
3563{
3564 struct module *owner = csw->owner;
3565 struct con_driver *con_driver;
3566 const char *desc;
3567 int i, retval = 0;
3568
3569 WARN_CONSOLE_UNLOCKED();
3570
3571 if (!try_module_get(owner))
3572 return -ENODEV;
3573
3574 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3575 con_driver = ®istered_con_driver[i];
3576
3577 /* already registered */
3578 if (con_driver->con == csw)
3579 retval = -EBUSY;
3580 }
3581
3582 if (retval)
3583 goto err;
3584
3585 desc = csw->con_startup();
3586
3587 if (!desc)
3588 goto err;
3589
3590 retval = -EINVAL;
3591
3592 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3593 con_driver = ®istered_con_driver[i];
3594
3595 if (con_driver->con == NULL &&
3596 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3597 con_driver->con = csw;
3598 con_driver->desc = desc;
3599 con_driver->node = i;
3600 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3601 CON_DRIVER_FLAG_INIT;
3602 con_driver->first = first;
3603 con_driver->last = last;
3604 retval = 0;
3605 break;
3606 }
3607 }
3608
3609 if (retval)
3610 goto err;
3611
3612 con_driver->dev =
3613 device_create_with_groups(vtconsole_class, NULL,
3614 MKDEV(0, con_driver->node),
3615 con_driver, con_dev_groups,
3616 "vtcon%i", con_driver->node);
3617 if (IS_ERR(con_driver->dev)) {
3618 printk(KERN_WARNING "Unable to create device for %s; "
3619 "errno = %ld\n", con_driver->desc,
3620 PTR_ERR(con_driver->dev));
3621 con_driver->dev = NULL;
3622 } else {
3623 vtconsole_init_device(con_driver);
3624 }
3625
3626err:
3627 module_put(owner);
3628 return retval;
3629}
3630
3631
3632/**
3633 * do_unregister_con_driver - unregister console driver from console layer
3634 * @csw: console driver
3635 *
3636 * DESCRIPTION: All drivers that registers to the console layer must
3637 * call this function upon exit, or if the console driver is in a state
3638 * where it won't be able to handle console services, such as the
3639 * framebuffer console without loaded framebuffer drivers.
3640 *
3641 * The driver must unbind first prior to unregistration.
3642 */
3643int do_unregister_con_driver(const struct consw *csw)
3644{
3645 int i;
3646
3647 /* cannot unregister a bound driver */
3648 if (con_is_bound(csw))
3649 return -EBUSY;
3650
3651 if (csw == conswitchp)
3652 return -EINVAL;
3653
3654 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3655 struct con_driver *con_driver = ®istered_con_driver[i];
3656
3657 if (con_driver->con == csw) {
3658 /*
3659 * Defer the removal of the sysfs entries since that
3660 * will acquire the kernfs s_active lock and we can't
3661 * acquire this lock while holding the console lock:
3662 * the unbind sysfs entry imposes already the opposite
3663 * order. Reset con already here to prevent any later
3664 * lookup to succeed and mark this slot as zombie, so
3665 * it won't get reused until we complete the removal
3666 * in the deferred work.
3667 */
3668 con_driver->con = NULL;
3669 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3670 schedule_work(&con_driver_unregister_work);
3671
3672 return 0;
3673 }
3674 }
3675
3676 return -ENODEV;
3677}
3678EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3679
3680static void con_driver_unregister_callback(struct work_struct *ignored)
3681{
3682 int i;
3683
3684 console_lock();
3685
3686 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3687 struct con_driver *con_driver = ®istered_con_driver[i];
3688
3689 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3690 continue;
3691
3692 console_unlock();
3693
3694 vtconsole_deinit_device(con_driver);
3695 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3696
3697 console_lock();
3698
3699 if (WARN_ON_ONCE(con_driver->con))
3700 con_driver->con = NULL;
3701 con_driver->desc = NULL;
3702 con_driver->dev = NULL;
3703 con_driver->node = 0;
3704 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3705 con_driver->flag = 0;
3706 con_driver->first = 0;
3707 con_driver->last = 0;
3708 }
3709
3710 console_unlock();
3711}
3712
3713/*
3714 * If we support more console drivers, this function is used
3715 * when a driver wants to take over some existing consoles
3716 * and become default driver for newly opened ones.
3717 *
3718 * do_take_over_console is basically a register followed by unbind
3719 */
3720int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3721{
3722 int err;
3723
3724 err = do_register_con_driver(csw, first, last);
3725 /*
3726 * If we get an busy error we still want to bind the console driver
3727 * and return success, as we may have unbound the console driver
3728 * but not unregistered it.
3729 */
3730 if (err == -EBUSY)
3731 err = 0;
3732 if (!err)
3733 do_bind_con_driver(csw, first, last, deflt);
3734
3735 return err;
3736}
3737EXPORT_SYMBOL_GPL(do_take_over_console);
3738
3739
3740/*
3741 * give_up_console is a wrapper to unregister_con_driver. It will only
3742 * work if driver is fully unbound.
3743 */
3744void give_up_console(const struct consw *csw)
3745{
3746 console_lock();
3747 do_unregister_con_driver(csw);
3748 console_unlock();
3749}
3750
3751static int __init vtconsole_class_init(void)
3752{
3753 int i;
3754
3755 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3756 if (IS_ERR(vtconsole_class)) {
3757 printk(KERN_WARNING "Unable to create vt console class; "
3758 "errno = %ld\n", PTR_ERR(vtconsole_class));
3759 vtconsole_class = NULL;
3760 }
3761
3762 /* Add system drivers to sysfs */
3763 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3764 struct con_driver *con = ®istered_con_driver[i];
3765
3766 if (con->con && !con->dev) {
3767 con->dev =
3768 device_create_with_groups(vtconsole_class, NULL,
3769 MKDEV(0, con->node),
3770 con, con_dev_groups,
3771 "vtcon%i", con->node);
3772
3773 if (IS_ERR(con->dev)) {
3774 printk(KERN_WARNING "Unable to create "
3775 "device for %s; errno = %ld\n",
3776 con->desc, PTR_ERR(con->dev));
3777 con->dev = NULL;
3778 } else {
3779 vtconsole_init_device(con);
3780 }
3781 }
3782 }
3783
3784 return 0;
3785}
3786postcore_initcall(vtconsole_class_init);
3787
3788#endif
3789
3790/*
3791 * Screen blanking
3792 */
3793
3794static int set_vesa_blanking(char __user *p)
3795{
3796 unsigned int mode;
3797
3798 if (get_user(mode, p + 1))
3799 return -EFAULT;
3800
3801 vesa_blank_mode = (mode < 4) ? mode : 0;
3802 return 0;
3803}
3804
3805void do_blank_screen(int entering_gfx)
3806{
3807 struct vc_data *vc = vc_cons[fg_console].d;
3808 int i;
3809
3810 WARN_CONSOLE_UNLOCKED();
3811
3812 if (console_blanked) {
3813 if (blank_state == blank_vesa_wait) {
3814 blank_state = blank_off;
3815 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3816 }
3817 return;
3818 }
3819
3820 /* entering graphics mode? */
3821 if (entering_gfx) {
3822 hide_cursor(vc);
3823 save_screen(vc);
3824 vc->vc_sw->con_blank(vc, -1, 1);
3825 console_blanked = fg_console + 1;
3826 blank_state = blank_off;
3827 set_origin(vc);
3828 return;
3829 }
3830
3831 if (blank_state != blank_normal_wait)
3832 return;
3833 blank_state = blank_off;
3834
3835 /* don't blank graphics */
3836 if (vc->vc_mode != KD_TEXT) {
3837 console_blanked = fg_console + 1;
3838 return;
3839 }
3840
3841 hide_cursor(vc);
3842 del_timer_sync(&console_timer);
3843 blank_timer_expired = 0;
3844
3845 save_screen(vc);
3846 /* In case we need to reset origin, blanking hook returns 1 */
3847 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3848 console_blanked = fg_console + 1;
3849 if (i)
3850 set_origin(vc);
3851
3852 if (console_blank_hook && console_blank_hook(1))
3853 return;
3854
3855 if (vesa_off_interval && vesa_blank_mode) {
3856 blank_state = blank_vesa_wait;
3857 mod_timer(&console_timer, jiffies + vesa_off_interval);
3858 }
3859 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3860}
3861EXPORT_SYMBOL(do_blank_screen);
3862
3863/*
3864 * Called by timer as well as from vt_console_driver
3865 */
3866void do_unblank_screen(int leaving_gfx)
3867{
3868 struct vc_data *vc;
3869
3870 /* This should now always be called from a "sane" (read: can schedule)
3871 * context for the sake of the low level drivers, except in the special
3872 * case of oops_in_progress
3873 */
3874 if (!oops_in_progress)
3875 might_sleep();
3876
3877 WARN_CONSOLE_UNLOCKED();
3878
3879 ignore_poke = 0;
3880 if (!console_blanked)
3881 return;
3882 if (!vc_cons_allocated(fg_console)) {
3883 /* impossible */
3884 pr_warn("unblank_screen: tty %d not allocated ??\n",
3885 fg_console + 1);
3886 return;
3887 }
3888 vc = vc_cons[fg_console].d;
3889 /* Try to unblank in oops case too */
3890 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3891 return; /* but leave console_blanked != 0 */
3892
3893 if (blankinterval) {
3894 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3895 blank_state = blank_normal_wait;
3896 }
3897
3898 console_blanked = 0;
3899 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3900 /* Low-level driver cannot restore -> do it ourselves */
3901 update_screen(vc);
3902 if (console_blank_hook)
3903 console_blank_hook(0);
3904 set_palette(vc);
3905 set_cursor(vc);
3906 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3907}
3908EXPORT_SYMBOL(do_unblank_screen);
3909
3910/*
3911 * This is called by the outside world to cause a forced unblank, mostly for
3912 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3913 * call it with 1 as an argument and so force a mode restore... that may kill
3914 * X or at least garbage the screen but would also make the Oops visible...
3915 */
3916void unblank_screen(void)
3917{
3918 do_unblank_screen(0);
3919}
3920
3921/*
3922 * We defer the timer blanking to work queue so it can take the console mutex
3923 * (console operations can still happen at irq time, but only from printk which
3924 * has the console mutex. Not perfect yet, but better than no locking
3925 */
3926static void blank_screen_t(unsigned long dummy)
3927{
3928 if (unlikely(!keventd_up())) {
3929 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3930 return;
3931 }
3932 blank_timer_expired = 1;
3933 schedule_work(&console_work);
3934}
3935
3936void poke_blanked_console(void)
3937{
3938 WARN_CONSOLE_UNLOCKED();
3939
3940 /* Add this so we quickly catch whoever might call us in a non
3941 * safe context. Nowadays, unblank_screen() isn't to be called in
3942 * atomic contexts and is allowed to schedule (with the special case
3943 * of oops_in_progress, but that isn't of any concern for this
3944 * function. --BenH.
3945 */
3946 might_sleep();
3947
3948 /* This isn't perfectly race free, but a race here would be mostly harmless,
3949 * at worse, we'll do a spurrious blank and it's unlikely
3950 */
3951 del_timer(&console_timer);
3952 blank_timer_expired = 0;
3953
3954 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3955 return;
3956 if (console_blanked)
3957 unblank_screen();
3958 else if (blankinterval) {
3959 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3960 blank_state = blank_normal_wait;
3961 }
3962}
3963
3964/*
3965 * Palettes
3966 */
3967
3968static void set_palette(struct vc_data *vc)
3969{
3970 WARN_CONSOLE_UNLOCKED();
3971
3972 if (vc->vc_mode != KD_GRAPHICS)
3973 vc->vc_sw->con_set_palette(vc, color_table);
3974}
3975
3976/*
3977 * Load palette into the DAC registers. arg points to a colour
3978 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3979 */
3980
3981int con_set_cmap(unsigned char __user *arg)
3982{
3983 int i, j, k;
3984 unsigned char colormap[3*16];
3985
3986 if (copy_from_user(colormap, arg, sizeof(colormap)))
3987 return -EFAULT;
3988
3989 console_lock();
3990 for (i = k = 0; i < 16; i++) {
3991 default_red[i] = colormap[k++];
3992 default_grn[i] = colormap[k++];
3993 default_blu[i] = colormap[k++];
3994 }
3995 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3996 if (!vc_cons_allocated(i))
3997 continue;
3998 for (j = k = 0; j < 16; j++) {
3999 vc_cons[i].d->vc_palette[k++] = default_red[j];
4000 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4001 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4002 }
4003 set_palette(vc_cons[i].d);
4004 }
4005 console_unlock();
4006
4007 return 0;
4008}
4009
4010int con_get_cmap(unsigned char __user *arg)
4011{
4012 int i, k;
4013 unsigned char colormap[3*16];
4014
4015 console_lock();
4016 for (i = k = 0; i < 16; i++) {
4017 colormap[k++] = default_red[i];
4018 colormap[k++] = default_grn[i];
4019 colormap[k++] = default_blu[i];
4020 }
4021 console_unlock();
4022
4023 if (copy_to_user(arg, colormap, sizeof(colormap)))
4024 return -EFAULT;
4025
4026 return 0;
4027}
4028
4029void reset_palette(struct vc_data *vc)
4030{
4031 int j, k;
4032 for (j=k=0; j<16; j++) {
4033 vc->vc_palette[k++] = default_red[j];
4034 vc->vc_palette[k++] = default_grn[j];
4035 vc->vc_palette[k++] = default_blu[j];
4036 }
4037 set_palette(vc);
4038}
4039
4040/*
4041 * Font switching
4042 *
4043 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4044 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4045 * depending on width) reserved for each character which is kinda wasty, but
4046 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4047 * is up to the actual low-level console-driver convert data into its favorite
4048 * format (maybe we should add a `fontoffset' field to the `display'
4049 * structure so we won't have to convert the fontdata all the time.
4050 * /Jes
4051 */
4052
4053#define max_font_size 65536
4054
4055static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4056{
4057 struct console_font font;
4058 int rc = -EINVAL;
4059 int c;
4060
4061 if (op->data) {
4062 font.data = kmalloc(max_font_size, GFP_KERNEL);
4063 if (!font.data)
4064 return -ENOMEM;
4065 } else
4066 font.data = NULL;
4067
4068 console_lock();
4069 if (vc->vc_mode != KD_TEXT)
4070 rc = -EINVAL;
4071 else if (vc->vc_sw->con_font_get)
4072 rc = vc->vc_sw->con_font_get(vc, &font);
4073 else
4074 rc = -ENOSYS;
4075 console_unlock();
4076
4077 if (rc)
4078 goto out;
4079
4080 c = (font.width+7)/8 * 32 * font.charcount;
4081
4082 if (op->data && font.charcount > op->charcount)
4083 rc = -ENOSPC;
4084 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4085 if (font.width > op->width || font.height > op->height)
4086 rc = -ENOSPC;
4087 } else {
4088 if (font.width != 8)
4089 rc = -EIO;
4090 else if ((op->height && font.height > op->height) ||
4091 font.height > 32)
4092 rc = -ENOSPC;
4093 }
4094 if (rc)
4095 goto out;
4096
4097 op->height = font.height;
4098 op->width = font.width;
4099 op->charcount = font.charcount;
4100
4101 if (op->data && copy_to_user(op->data, font.data, c))
4102 rc = -EFAULT;
4103
4104out:
4105 kfree(font.data);
4106 return rc;
4107}
4108
4109static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4110{
4111 struct console_font font;
4112 int rc = -EINVAL;
4113 int size;
4114
4115 if (vc->vc_mode != KD_TEXT)
4116 return -EINVAL;
4117 if (!op->data)
4118 return -EINVAL;
4119 if (op->charcount > 512)
4120 return -EINVAL;
4121 if (!op->height) { /* Need to guess font height [compat] */
4122 int h, i;
4123 u8 __user *charmap = op->data;
4124 u8 tmp;
4125
4126 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4127 so that we can get rid of this soon */
4128 if (!(op->flags & KD_FONT_FLAG_OLD))
4129 return -EINVAL;
4130 for (h = 32; h > 0; h--)
4131 for (i = 0; i < op->charcount; i++) {
4132 if (get_user(tmp, &charmap[32*i+h-1]))
4133 return -EFAULT;
4134 if (tmp)
4135 goto nonzero;
4136 }
4137 return -EINVAL;
4138 nonzero:
4139 op->height = h;
4140 }
4141 if (op->width <= 0 || op->width > 32 || op->height > 32)
4142 return -EINVAL;
4143 size = (op->width+7)/8 * 32 * op->charcount;
4144 if (size > max_font_size)
4145 return -ENOSPC;
4146 font.charcount = op->charcount;
4147 font.height = op->height;
4148 font.width = op->width;
4149 font.data = memdup_user(op->data, size);
4150 if (IS_ERR(font.data))
4151 return PTR_ERR(font.data);
4152 console_lock();
4153 if (vc->vc_mode != KD_TEXT)
4154 rc = -EINVAL;
4155 else if (vc->vc_sw->con_font_set)
4156 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4157 else
4158 rc = -ENOSYS;
4159 console_unlock();
4160 kfree(font.data);
4161 return rc;
4162}
4163
4164static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4165{
4166 struct console_font font = {.width = op->width, .height = op->height};
4167 char name[MAX_FONT_NAME];
4168 char *s = name;
4169 int rc;
4170
4171
4172 if (!op->data)
4173 s = NULL;
4174 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4175 return -EFAULT;
4176 else
4177 name[MAX_FONT_NAME - 1] = 0;
4178
4179 console_lock();
4180 if (vc->vc_mode != KD_TEXT) {
4181 console_unlock();
4182 return -EINVAL;
4183 }
4184 if (vc->vc_sw->con_font_default)
4185 rc = vc->vc_sw->con_font_default(vc, &font, s);
4186 else
4187 rc = -ENOSYS;
4188 console_unlock();
4189 if (!rc) {
4190 op->width = font.width;
4191 op->height = font.height;
4192 }
4193 return rc;
4194}
4195
4196static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4197{
4198 int con = op->height;
4199 int rc;
4200
4201
4202 console_lock();
4203 if (vc->vc_mode != KD_TEXT)
4204 rc = -EINVAL;
4205 else if (!vc->vc_sw->con_font_copy)
4206 rc = -ENOSYS;
4207 else if (con < 0 || !vc_cons_allocated(con))
4208 rc = -ENOTTY;
4209 else if (con == vc->vc_num) /* nothing to do */
4210 rc = 0;
4211 else
4212 rc = vc->vc_sw->con_font_copy(vc, con);
4213 console_unlock();
4214 return rc;
4215}
4216
4217int con_font_op(struct vc_data *vc, struct console_font_op *op)
4218{
4219 switch (op->op) {
4220 case KD_FONT_OP_SET:
4221 return con_font_set(vc, op);
4222 case KD_FONT_OP_GET:
4223 return con_font_get(vc, op);
4224 case KD_FONT_OP_SET_DEFAULT:
4225 return con_font_default(vc, op);
4226 case KD_FONT_OP_COPY:
4227 return con_font_copy(vc, op);
4228 }
4229 return -ENOSYS;
4230}
4231
4232/*
4233 * Interface exported to selection and vcs.
4234 */
4235
4236/* used by selection */
4237u16 screen_glyph(struct vc_data *vc, int offset)
4238{
4239 u16 w = scr_readw(screenpos(vc, offset, 1));
4240 u16 c = w & 0xff;
4241
4242 if (w & vc->vc_hi_font_mask)
4243 c |= 0x100;
4244 return c;
4245}
4246EXPORT_SYMBOL_GPL(screen_glyph);
4247
4248/* used by vcs - note the word offset */
4249unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4250{
4251 return screenpos(vc, 2 * w_offset, viewed);
4252}
4253EXPORT_SYMBOL_GPL(screen_pos);
4254
4255void getconsxy(struct vc_data *vc, unsigned char *p)
4256{
4257 p[0] = vc->vc_x;
4258 p[1] = vc->vc_y;
4259}
4260
4261void putconsxy(struct vc_data *vc, unsigned char *p)
4262{
4263 hide_cursor(vc);
4264 gotoxy(vc, p[0], p[1]);
4265 set_cursor(vc);
4266}
4267
4268u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4269{
4270 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4271 return softcursor_original;
4272 return scr_readw(org);
4273}
4274
4275void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4276{
4277 scr_writew(val, org);
4278 if ((unsigned long)org == vc->vc_pos) {
4279 softcursor_original = -1;
4280 add_softcursor(vc);
4281 }
4282}
4283
4284void vcs_scr_updated(struct vc_data *vc)
4285{
4286 notify_update(vc);
4287}
4288
4289/*
4290 * Visible symbols for modules
4291 */
4292
4293EXPORT_SYMBOL(color_table);
4294EXPORT_SYMBOL(default_red);
4295EXPORT_SYMBOL(default_grn);
4296EXPORT_SYMBOL(default_blu);
4297EXPORT_SYMBOL(update_region);
4298EXPORT_SYMBOL(redraw_screen);
4299EXPORT_SYMBOL(vc_resize);
4300EXPORT_SYMBOL(fg_console);
4301EXPORT_SYMBOL(console_blank_hook);
4302EXPORT_SYMBOL(console_blanked);
4303EXPORT_SYMBOL(vc_cons);
4304EXPORT_SYMBOL(global_cursor_default);
4305#ifndef VT_SINGLE_DRIVER
4306EXPORT_SYMBOL(give_up_console);
4307#endif