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