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