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