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