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