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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6/*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
61 * deletion SMP-safe. 17Jun00, Andrew Morton
62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72 */
73
74#include <linux/module.h>
75#include <linux/types.h>
76#include <linux/sched/signal.h>
77#include <linux/tty.h>
78#include <linux/tty_flip.h>
79#include <linux/kernel.h>
80#include <linux/string.h>
81#include <linux/errno.h>
82#include <linux/kd.h>
83#include <linux/slab.h>
84#include <linux/vmalloc.h>
85#include <linux/major.h>
86#include <linux/mm.h>
87#include <linux/console.h>
88#include <linux/init.h>
89#include <linux/mutex.h>
90#include <linux/vt_kern.h>
91#include <linux/selection.h>
92#include <linux/tiocl.h>
93#include <linux/kbd_kern.h>
94#include <linux/consolemap.h>
95#include <linux/timer.h>
96#include <linux/interrupt.h>
97#include <linux/workqueue.h>
98#include <linux/pm.h>
99#include <linux/font.h>
100#include <linux/bitops.h>
101#include <linux/notifier.h>
102#include <linux/device.h>
103#include <linux/io.h>
104#include <linux/uaccess.h>
105#include <linux/kdb.h>
106#include <linux/ctype.h>
107#include <linux/bsearch.h>
108#include <linux/gcd.h>
109
110#define MAX_NR_CON_DRIVER 16
111
112#define CON_DRIVER_FLAG_MODULE 1
113#define CON_DRIVER_FLAG_INIT 2
114#define CON_DRIVER_FLAG_ATTR 4
115#define CON_DRIVER_FLAG_ZOMBIE 8
116
117struct con_driver {
118 const struct consw *con;
119 const char *desc;
120 struct device *dev;
121 int node;
122 int first;
123 int last;
124 int flag;
125};
126
127static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
128const struct consw *conswitchp;
129
130/*
131 * Here is the default bell parameters: 750HZ, 1/8th of a second
132 */
133#define DEFAULT_BELL_PITCH 750
134#define DEFAULT_BELL_DURATION (HZ/8)
135#define DEFAULT_CURSOR_BLINK_MS 200
136
137struct vc vc_cons [MAX_NR_CONSOLES];
138EXPORT_SYMBOL(vc_cons);
139
140static const struct consw *con_driver_map[MAX_NR_CONSOLES];
141
142static int con_open(struct tty_struct *, struct file *);
143static void vc_init(struct vc_data *vc, int do_clear);
144static void gotoxy(struct vc_data *vc, int new_x, int new_y);
145static void save_cur(struct vc_data *vc);
146static void reset_terminal(struct vc_data *vc, int do_clear);
147static void con_flush_chars(struct tty_struct *tty);
148static int set_vesa_blanking(u8 __user *mode);
149static void set_cursor(struct vc_data *vc);
150static void hide_cursor(struct vc_data *vc);
151static void console_callback(struct work_struct *ignored);
152static void con_driver_unregister_callback(struct work_struct *ignored);
153static void blank_screen_t(struct timer_list *unused);
154static void set_palette(struct vc_data *vc);
155static void unblank_screen(void);
156
157#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
158
159int default_utf8 = true;
160module_param(default_utf8, int, S_IRUGO | S_IWUSR);
161int global_cursor_default = -1;
162module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
163EXPORT_SYMBOL(global_cursor_default);
164
165static int cur_default = CUR_UNDERLINE;
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;
176EXPORT_SYMBOL(console_blanked);
177
178static enum vesa_blank_mode vesa_blank_mode;
179static int vesa_off_interval;
180static int blankinterval;
181core_param(consoleblank, blankinterval, int, 0444);
182
183static DECLARE_WORK(console_work, console_callback);
184static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
185
186/*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
190 * saved_* variants are for save/restore around kernel debugger enter/leave
191 */
192int fg_console;
193EXPORT_SYMBOL(fg_console);
194int last_console;
195int want_console = -1;
196
197static int saved_fg_console;
198static int saved_last_console;
199static int saved_want_console;
200static int saved_vc_mode;
201static int saved_console_blanked;
202
203/*
204 * For each existing display, we have a pointer to console currently visible
205 * on that display, allowing consoles other than fg_console to be refreshed
206 * appropriately. Unless the low-level driver supplies its own display_fg
207 * variable, we use this one for the "master display".
208 */
209static struct vc_data *master_display_fg;
210
211/*
212 * Unfortunately, we need to delay tty echo when we're currently writing to the
213 * console since the code is (and always was) not re-entrant, so we schedule
214 * all flip requests to process context with schedule-task() and run it from
215 * console_callback().
216 */
217
218/*
219 * For the same reason, we defer scrollback to the console callback.
220 */
221static int scrollback_delta;
222
223/*
224 * Hook so that the power management routines can (un)blank
225 * the console on our behalf.
226 */
227int (*console_blank_hook)(int);
228EXPORT_SYMBOL(console_blank_hook);
229
230static DEFINE_TIMER(console_timer, blank_screen_t);
231static int blank_state;
232static int blank_timer_expired;
233enum {
234 blank_off = 0,
235 blank_normal_wait,
236 blank_vesa_wait,
237};
238
239/*
240 * /sys/class/tty/tty0/
241 *
242 * the attribute 'active' contains the name of the current vc
243 * console and it supports poll() to detect vc switches
244 */
245static struct device *tty0dev;
246
247/*
248 * Notifier list for console events.
249 */
250static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
251
252int register_vt_notifier(struct notifier_block *nb)
253{
254 return atomic_notifier_chain_register(&vt_notifier_list, nb);
255}
256EXPORT_SYMBOL_GPL(register_vt_notifier);
257
258int unregister_vt_notifier(struct notifier_block *nb)
259{
260 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
261}
262EXPORT_SYMBOL_GPL(unregister_vt_notifier);
263
264static void notify_write(struct vc_data *vc, unsigned int unicode)
265{
266 struct vt_notifier_param param = { .vc = vc, .c = unicode };
267 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
268}
269
270static void notify_update(struct vc_data *vc)
271{
272 struct vt_notifier_param param = { .vc = vc };
273 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
274}
275/*
276 * Low-Level Functions
277 */
278
279static inline bool con_is_fg(const struct vc_data *vc)
280{
281 return vc->vc_num == fg_console;
282}
283
284static inline bool con_should_update(const struct vc_data *vc)
285{
286 return con_is_visible(vc) && !console_blanked;
287}
288
289static inline u16 *screenpos(const struct vc_data *vc, unsigned int offset,
290 bool viewed)
291{
292 unsigned long origin = viewed ? vc->vc_visible_origin : vc->vc_origin;
293
294 return (u16 *)(origin + offset);
295}
296
297static void con_putc(struct vc_data *vc, u16 ca, unsigned int y, unsigned int x)
298{
299 if (vc->vc_sw->con_putc)
300 vc->vc_sw->con_putc(vc, ca, y, x);
301 else
302 vc->vc_sw->con_putcs(vc, &ca, 1, y, x);
303}
304
305/* Called from the keyboard irq path.. */
306static inline void scrolldelta(int lines)
307{
308 /* FIXME */
309 /* scrolldelta needs some kind of consistency lock, but the BKL was
310 and still is not protecting versus the scheduled back end */
311 scrollback_delta += lines;
312 schedule_console_callback();
313}
314
315void schedule_console_callback(void)
316{
317 schedule_work(&console_work);
318}
319
320/*
321 * Code to manage unicode-based screen buffers
322 */
323
324/*
325 * Our screen buffer is preceded by an array of line pointers so that
326 * scrolling only implies some pointer shuffling.
327 */
328
329static u32 **vc_uniscr_alloc(unsigned int cols, unsigned int rows)
330{
331 u32 **uni_lines;
332 void *p;
333 unsigned int memsize, i, col_size = cols * sizeof(**uni_lines);
334
335 /* allocate everything in one go */
336 memsize = col_size * rows;
337 memsize += rows * sizeof(*uni_lines);
338 uni_lines = vzalloc(memsize);
339 if (!uni_lines)
340 return NULL;
341
342 /* initial line pointers */
343 p = uni_lines + rows;
344 for (i = 0; i < rows; i++) {
345 uni_lines[i] = p;
346 p += col_size;
347 }
348
349 return uni_lines;
350}
351
352static void vc_uniscr_free(u32 **uni_lines)
353{
354 vfree(uni_lines);
355}
356
357static void vc_uniscr_set(struct vc_data *vc, u32 **new_uni_lines)
358{
359 vc_uniscr_free(vc->vc_uni_lines);
360 vc->vc_uni_lines = new_uni_lines;
361}
362
363static void vc_uniscr_putc(struct vc_data *vc, u32 uc)
364{
365 if (vc->vc_uni_lines)
366 vc->vc_uni_lines[vc->state.y][vc->state.x] = uc;
367}
368
369static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
370{
371 if (vc->vc_uni_lines) {
372 u32 *ln = vc->vc_uni_lines[vc->state.y];
373 unsigned int x = vc->state.x, cols = vc->vc_cols;
374
375 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
376 memset32(&ln[x], ' ', nr);
377 }
378}
379
380static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
381{
382 if (vc->vc_uni_lines) {
383 u32 *ln = vc->vc_uni_lines[vc->state.y];
384 unsigned int x = vc->state.x, cols = vc->vc_cols;
385
386 memmove(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
387 memset32(&ln[cols - nr], ' ', nr);
388 }
389}
390
391static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
392 unsigned int nr)
393{
394 if (vc->vc_uni_lines)
395 memset32(&vc->vc_uni_lines[vc->state.y][x], ' ', nr);
396}
397
398static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
399 unsigned int nr)
400{
401 if (vc->vc_uni_lines)
402 while (nr--)
403 memset32(vc->vc_uni_lines[y++], ' ', vc->vc_cols);
404}
405
406/* juggling array rotation algorithm (complexity O(N), size complexity O(1)) */
407static void juggle_array(u32 **array, unsigned int size, unsigned int nr)
408{
409 unsigned int gcd_idx;
410
411 for (gcd_idx = 0; gcd_idx < gcd(nr, size); gcd_idx++) {
412 u32 *gcd_idx_val = array[gcd_idx];
413 unsigned int dst_idx = gcd_idx;
414
415 while (1) {
416 unsigned int src_idx = (dst_idx + nr) % size;
417 if (src_idx == gcd_idx)
418 break;
419
420 array[dst_idx] = array[src_idx];
421 dst_idx = src_idx;
422 }
423
424 array[dst_idx] = gcd_idx_val;
425 }
426}
427
428static void vc_uniscr_scroll(struct vc_data *vc, unsigned int top,
429 unsigned int bottom, enum con_scroll dir,
430 unsigned int nr)
431{
432 u32 **uni_lines = vc->vc_uni_lines;
433 unsigned int size = bottom - top;
434
435 if (!uni_lines)
436 return;
437
438 if (dir == SM_DOWN) {
439 juggle_array(&uni_lines[top], size, size - nr);
440 vc_uniscr_clear_lines(vc, top, nr);
441 } else {
442 juggle_array(&uni_lines[top], size, nr);
443 vc_uniscr_clear_lines(vc, bottom - nr, nr);
444 }
445}
446
447static void vc_uniscr_copy_area(u32 **dst_lines,
448 unsigned int dst_cols,
449 unsigned int dst_rows,
450 u32 **src_lines,
451 unsigned int src_cols,
452 unsigned int src_top_row,
453 unsigned int src_bot_row)
454{
455 unsigned int dst_row = 0;
456
457 if (!dst_lines)
458 return;
459
460 while (src_top_row < src_bot_row) {
461 u32 *src_line = src_lines[src_top_row];
462 u32 *dst_line = dst_lines[dst_row];
463
464 memcpy(dst_line, src_line, src_cols * sizeof(*src_line));
465 if (dst_cols - src_cols)
466 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
467 src_top_row++;
468 dst_row++;
469 }
470 while (dst_row < dst_rows) {
471 u32 *dst_line = dst_lines[dst_row];
472
473 memset32(dst_line, ' ', dst_cols);
474 dst_row++;
475 }
476}
477
478/*
479 * Called from vcs_read() to make sure unicode screen retrieval is possible.
480 * This will initialize the unicode screen buffer if not already done.
481 * This returns 0 if OK, or a negative error code otherwise.
482 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
483 */
484int vc_uniscr_check(struct vc_data *vc)
485{
486 u32 **uni_lines;
487 unsigned short *p;
488 int x, y, mask;
489
490 WARN_CONSOLE_UNLOCKED();
491
492 if (!vc->vc_utf)
493 return -ENODATA;
494
495 if (vc->vc_uni_lines)
496 return 0;
497
498 uni_lines = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
499 if (!uni_lines)
500 return -ENOMEM;
501
502 /*
503 * Let's populate it initially with (imperfect) reverse translation.
504 * This is the next best thing we can do short of having it enabled
505 * from the start even when no users rely on this functionality. True
506 * unicode content will be available after a complete screen refresh.
507 */
508 p = (unsigned short *)vc->vc_origin;
509 mask = vc->vc_hi_font_mask | 0xff;
510 for (y = 0; y < vc->vc_rows; y++) {
511 u32 *line = uni_lines[y];
512 for (x = 0; x < vc->vc_cols; x++) {
513 u16 glyph = scr_readw(p++) & mask;
514 line[x] = inverse_translate(vc, glyph, true);
515 }
516 }
517
518 vc->vc_uni_lines = uni_lines;
519
520 return 0;
521}
522
523/*
524 * Called from vcs_read() to get the unicode data from the screen.
525 * This must be preceded by a successful call to vc_uniscr_check() once
526 * the console lock has been taken.
527 */
528void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
529 unsigned int row, unsigned int col, unsigned int nr)
530{
531 u32 **uni_lines = vc->vc_uni_lines;
532 int offset = row * vc->vc_size_row + col * 2;
533 unsigned long pos;
534
535 if (WARN_ON_ONCE(!uni_lines))
536 return;
537
538 pos = (unsigned long)screenpos(vc, offset, viewed);
539 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
540 /*
541 * Desired position falls in the main screen buffer.
542 * However the actual row/col might be different if
543 * scrollback is active.
544 */
545 row = (pos - vc->vc_origin) / vc->vc_size_row;
546 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
547 memcpy(dest, &uni_lines[row][col], nr * sizeof(u32));
548 } else {
549 /*
550 * Scrollback is active. For now let's simply backtranslate
551 * the screen glyphs until the unicode screen buffer does
552 * synchronize with console display drivers for a scrollback
553 * buffer of its own.
554 */
555 u16 *p = (u16 *)pos;
556 int mask = vc->vc_hi_font_mask | 0xff;
557 u32 *uni_buf = dest;
558 while (nr--) {
559 u16 glyph = scr_readw(p++) & mask;
560 *uni_buf++ = inverse_translate(vc, glyph, true);
561 }
562 }
563}
564
565static void con_scroll(struct vc_data *vc, unsigned int top,
566 unsigned int bottom, enum con_scroll dir,
567 unsigned int nr)
568{
569 unsigned int rows = bottom - top;
570 u16 *clear, *dst, *src;
571
572 if (top + nr >= bottom)
573 nr = rows - 1;
574 if (bottom > vc->vc_rows || top >= bottom || nr < 1)
575 return;
576
577 vc_uniscr_scroll(vc, top, bottom, dir, nr);
578 if (con_is_visible(vc) &&
579 vc->vc_sw->con_scroll(vc, top, bottom, dir, nr))
580 return;
581
582 src = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * top);
583 dst = (u16 *)(vc->vc_origin + vc->vc_size_row * (top + nr));
584
585 if (dir == SM_UP) {
586 clear = src + (rows - nr) * vc->vc_cols;
587 swap(src, dst);
588 }
589 scr_memmovew(dst, src, (rows - nr) * vc->vc_size_row);
590 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
591}
592
593static void do_update_region(struct vc_data *vc, unsigned long start, int count)
594{
595 unsigned int xx, yy, offset;
596 u16 *p = (u16 *)start;
597
598 offset = (start - vc->vc_origin) / 2;
599 xx = offset % vc->vc_cols;
600 yy = offset / vc->vc_cols;
601
602 for(;;) {
603 u16 attrib = scr_readw(p) & 0xff00;
604 int startx = xx;
605 u16 *q = p;
606 while (xx < vc->vc_cols && count) {
607 if (attrib != (scr_readw(p) & 0xff00)) {
608 if (p > q)
609 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
610 startx = xx;
611 q = p;
612 attrib = scr_readw(p) & 0xff00;
613 }
614 p++;
615 xx++;
616 count--;
617 }
618 if (p > q)
619 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
620 if (!count)
621 break;
622 xx = 0;
623 yy++;
624 }
625}
626
627void update_region(struct vc_data *vc, unsigned long start, int count)
628{
629 WARN_CONSOLE_UNLOCKED();
630
631 if (con_should_update(vc)) {
632 hide_cursor(vc);
633 do_update_region(vc, start, count);
634 set_cursor(vc);
635 }
636}
637EXPORT_SYMBOL(update_region);
638
639/* Structure of attributes is hardware-dependent */
640
641static u8 build_attr(struct vc_data *vc, u8 _color,
642 enum vc_intensity _intensity, bool _blink, bool _underline,
643 bool _reverse, bool _italic)
644{
645 if (vc->vc_sw->con_build_attr)
646 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
647 _blink, _underline, _reverse, _italic);
648
649/*
650 * ++roman: I completely changed the attribute format for monochrome
651 * mode (!can_do_color). The formerly used MDA (monochrome display
652 * adapter) format didn't allow the combination of certain effects.
653 * Now the attribute is just a bit vector:
654 * Bit 0..1: intensity (0..2)
655 * Bit 2 : underline
656 * Bit 3 : reverse
657 * Bit 7 : blink
658 */
659 {
660 u8 a = _color;
661 if (!vc->vc_can_do_color)
662 return _intensity |
663 (_italic << 1) |
664 (_underline << 2) |
665 (_reverse << 3) |
666 (_blink << 7);
667 if (_italic)
668 a = (a & 0xF0) | vc->vc_itcolor;
669 else if (_underline)
670 a = (a & 0xf0) | vc->vc_ulcolor;
671 else if (_intensity == VCI_HALF_BRIGHT)
672 a = (a & 0xf0) | vc->vc_halfcolor;
673 if (_reverse)
674 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
675 if (_blink)
676 a ^= 0x80;
677 if (_intensity == VCI_BOLD)
678 a ^= 0x08;
679 if (vc->vc_hi_font_mask == 0x100)
680 a <<= 1;
681 return a;
682 }
683}
684
685static void update_attr(struct vc_data *vc)
686{
687 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
688 vc->state.blink, vc->state.underline,
689 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
690 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
691 VCI_NORMAL, vc->state.blink, false,
692 vc->vc_decscnm, false) << 8);
693}
694
695/* Note: inverting the screen twice should revert to the original state */
696void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
697{
698 u16 *p;
699
700 WARN_CONSOLE_UNLOCKED();
701
702 count /= 2;
703 p = screenpos(vc, offset, viewed);
704 if (vc->vc_sw->con_invert_region) {
705 vc->vc_sw->con_invert_region(vc, p, count);
706 } else {
707 u16 *q = p;
708 int cnt = count;
709 u16 a;
710
711 if (!vc->vc_can_do_color) {
712 while (cnt--) {
713 a = scr_readw(q);
714 a ^= 0x0800;
715 scr_writew(a, q);
716 q++;
717 }
718 } else if (vc->vc_hi_font_mask == 0x100) {
719 while (cnt--) {
720 a = scr_readw(q);
721 a = (a & 0x11ff) |
722 ((a & 0xe000) >> 4) |
723 ((a & 0x0e00) << 4);
724 scr_writew(a, q);
725 q++;
726 }
727 } else {
728 while (cnt--) {
729 a = scr_readw(q);
730 a = (a & 0x88ff) |
731 ((a & 0x7000) >> 4) |
732 ((a & 0x0700) << 4);
733 scr_writew(a, q);
734 q++;
735 }
736 }
737 }
738
739 if (con_should_update(vc))
740 do_update_region(vc, (unsigned long) p, count);
741 notify_update(vc);
742}
743
744/* used by selection: complement pointer position */
745void complement_pos(struct vc_data *vc, int offset)
746{
747 static int old_offset = -1;
748 static unsigned short old;
749 static unsigned short oldx, oldy;
750
751 WARN_CONSOLE_UNLOCKED();
752
753 if (old_offset != -1 && old_offset >= 0 &&
754 old_offset < vc->vc_screenbuf_size) {
755 scr_writew(old, screenpos(vc, old_offset, true));
756 if (con_should_update(vc))
757 con_putc(vc, old, oldy, oldx);
758 notify_update(vc);
759 }
760
761 old_offset = offset;
762
763 if (offset != -1 && offset >= 0 &&
764 offset < vc->vc_screenbuf_size) {
765 unsigned short new;
766 u16 *p = screenpos(vc, offset, true);
767 old = scr_readw(p);
768 new = old ^ vc->vc_complement_mask;
769 scr_writew(new, p);
770 if (con_should_update(vc)) {
771 oldx = (offset >> 1) % vc->vc_cols;
772 oldy = (offset >> 1) / vc->vc_cols;
773 con_putc(vc, new, oldy, oldx);
774 }
775 notify_update(vc);
776 }
777}
778
779static void insert_char(struct vc_data *vc, unsigned int nr)
780{
781 unsigned short *p = (unsigned short *) vc->vc_pos;
782
783 vc_uniscr_insert(vc, nr);
784 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
785 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
786 vc->vc_need_wrap = 0;
787 if (con_should_update(vc))
788 do_update_region(vc, (unsigned long) p,
789 vc->vc_cols - vc->state.x);
790}
791
792static void delete_char(struct vc_data *vc, unsigned int nr)
793{
794 unsigned short *p = (unsigned short *) vc->vc_pos;
795
796 vc_uniscr_delete(vc, nr);
797 scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
798 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
799 nr * 2);
800 vc->vc_need_wrap = 0;
801 if (con_should_update(vc))
802 do_update_region(vc, (unsigned long) p,
803 vc->vc_cols - vc->state.x);
804}
805
806static int softcursor_original = -1;
807
808static void add_softcursor(struct vc_data *vc)
809{
810 int i = scr_readw((u16 *) vc->vc_pos);
811 u32 type = vc->vc_cursor_type;
812
813 if (!(type & CUR_SW))
814 return;
815 if (softcursor_original != -1)
816 return;
817 softcursor_original = i;
818 i |= CUR_SET(type);
819 i ^= CUR_CHANGE(type);
820 if ((type & CUR_ALWAYS_BG) &&
821 (softcursor_original & CUR_BG) == (i & CUR_BG))
822 i ^= CUR_BG;
823 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
824 i ^= CUR_FG;
825 scr_writew(i, (u16 *)vc->vc_pos);
826 if (con_should_update(vc))
827 con_putc(vc, i, vc->state.y, vc->state.x);
828}
829
830static void hide_softcursor(struct vc_data *vc)
831{
832 if (softcursor_original != -1) {
833 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
834 if (con_should_update(vc))
835 con_putc(vc, softcursor_original, vc->state.y,
836 vc->state.x);
837 softcursor_original = -1;
838 }
839}
840
841static void hide_cursor(struct vc_data *vc)
842{
843 if (vc_is_sel(vc))
844 clear_selection();
845
846 vc->vc_sw->con_cursor(vc, false);
847 hide_softcursor(vc);
848}
849
850static void set_cursor(struct vc_data *vc)
851{
852 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
853 return;
854 if (vc->vc_deccm) {
855 if (vc_is_sel(vc))
856 clear_selection();
857 add_softcursor(vc);
858 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
859 vc->vc_sw->con_cursor(vc, true);
860 } else
861 hide_cursor(vc);
862}
863
864static void set_origin(struct vc_data *vc)
865{
866 WARN_CONSOLE_UNLOCKED();
867
868 if (!con_is_visible(vc) ||
869 !vc->vc_sw->con_set_origin ||
870 !vc->vc_sw->con_set_origin(vc))
871 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
872 vc->vc_visible_origin = vc->vc_origin;
873 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
874 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
875 2 * vc->state.x;
876}
877
878static void save_screen(struct vc_data *vc)
879{
880 WARN_CONSOLE_UNLOCKED();
881
882 if (vc->vc_sw->con_save_screen)
883 vc->vc_sw->con_save_screen(vc);
884}
885
886static void flush_scrollback(struct vc_data *vc)
887{
888 WARN_CONSOLE_UNLOCKED();
889
890 set_origin(vc);
891 if (!con_is_visible(vc))
892 return;
893
894 /*
895 * The legacy way for flushing the scrollback buffer is to use a side
896 * effect of the con_switch method. We do it only on the foreground
897 * console as background consoles have no scrollback buffers in that
898 * case and we obviously don't want to switch to them.
899 */
900 hide_cursor(vc);
901 vc->vc_sw->con_switch(vc);
902 set_cursor(vc);
903}
904
905/*
906 * Redrawing of screen
907 */
908
909void clear_buffer_attributes(struct vc_data *vc)
910{
911 unsigned short *p = (unsigned short *)vc->vc_origin;
912 int count = vc->vc_screenbuf_size / 2;
913 int mask = vc->vc_hi_font_mask | 0xff;
914
915 for (; count > 0; count--, p++) {
916 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
917 }
918}
919
920void redraw_screen(struct vc_data *vc, int is_switch)
921{
922 int redraw = 0;
923
924 WARN_CONSOLE_UNLOCKED();
925
926 if (!vc) {
927 /* strange ... */
928 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
929 return;
930 }
931
932 if (is_switch) {
933 struct vc_data *old_vc = vc_cons[fg_console].d;
934 if (old_vc == vc)
935 return;
936 if (!con_is_visible(vc))
937 redraw = 1;
938 *vc->vc_display_fg = vc;
939 fg_console = vc->vc_num;
940 hide_cursor(old_vc);
941 if (!con_is_visible(old_vc)) {
942 save_screen(old_vc);
943 set_origin(old_vc);
944 }
945 if (tty0dev)
946 sysfs_notify(&tty0dev->kobj, NULL, "active");
947 } else {
948 hide_cursor(vc);
949 redraw = 1;
950 }
951
952 if (redraw) {
953 bool update;
954 int old_was_color = vc->vc_can_do_color;
955
956 set_origin(vc);
957 update = vc->vc_sw->con_switch(vc);
958 set_palette(vc);
959 /*
960 * If console changed from mono<->color, the best we can do
961 * is to clear the buffer attributes. As it currently stands,
962 * rebuilding new attributes from the old buffer is not doable
963 * without overly complex code.
964 */
965 if (old_was_color != vc->vc_can_do_color) {
966 update_attr(vc);
967 clear_buffer_attributes(vc);
968 }
969
970 if (update && vc->vc_mode != KD_GRAPHICS)
971 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
972 }
973 set_cursor(vc);
974 if (is_switch) {
975 vt_set_leds_compute_shiftstate();
976 notify_update(vc);
977 }
978}
979EXPORT_SYMBOL(redraw_screen);
980
981/*
982 * Allocation, freeing and resizing of VTs.
983 */
984
985int vc_cons_allocated(unsigned int i)
986{
987 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
988}
989
990static void visual_init(struct vc_data *vc, int num, bool init)
991{
992 /* ++Geert: vc->vc_sw->con_init determines console size */
993 if (vc->vc_sw)
994 module_put(vc->vc_sw->owner);
995 vc->vc_sw = conswitchp;
996
997 if (con_driver_map[num])
998 vc->vc_sw = con_driver_map[num];
999
1000 __module_get(vc->vc_sw->owner);
1001 vc->vc_num = num;
1002 vc->vc_display_fg = &master_display_fg;
1003 if (vc->uni_pagedict_loc)
1004 con_free_unimap(vc);
1005 vc->uni_pagedict_loc = &vc->uni_pagedict;
1006 vc->uni_pagedict = NULL;
1007 vc->vc_hi_font_mask = 0;
1008 vc->vc_complement_mask = 0;
1009 vc->vc_can_do_color = 0;
1010 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1011 vc->vc_sw->con_init(vc, init);
1012 if (!vc->vc_complement_mask)
1013 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1014 vc->vc_s_complement_mask = vc->vc_complement_mask;
1015 vc->vc_size_row = vc->vc_cols << 1;
1016 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1017}
1018
1019
1020static void visual_deinit(struct vc_data *vc)
1021{
1022 vc->vc_sw->con_deinit(vc);
1023 module_put(vc->vc_sw->owner);
1024}
1025
1026static void vc_port_destruct(struct tty_port *port)
1027{
1028 struct vc_data *vc = container_of(port, struct vc_data, port);
1029
1030 kfree(vc);
1031}
1032
1033static const struct tty_port_operations vc_port_ops = {
1034 .destruct = vc_port_destruct,
1035};
1036
1037/*
1038 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1039 * [this is to be used together with some user program
1040 * like resize that changes the hardware videomode]
1041 */
1042#define VC_MAXCOL (32767)
1043#define VC_MAXROW (32767)
1044
1045int vc_allocate(unsigned int currcons) /* return 0 on success */
1046{
1047 struct vt_notifier_param param;
1048 struct vc_data *vc;
1049 int err;
1050
1051 WARN_CONSOLE_UNLOCKED();
1052
1053 if (currcons >= MAX_NR_CONSOLES)
1054 return -ENXIO;
1055
1056 if (vc_cons[currcons].d)
1057 return 0;
1058
1059 /* due to the granularity of kmalloc, we waste some memory here */
1060 /* the alloc is done in two steps, to optimize the common situation
1061 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1062 /* although the numbers above are not valid since long ago, the
1063 point is still up-to-date and the comment still has its value
1064 even if only as a historical artifact. --mj, July 1998 */
1065 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1066 if (!vc)
1067 return -ENOMEM;
1068
1069 vc_cons[currcons].d = vc;
1070 tty_port_init(&vc->port);
1071 vc->port.ops = &vc_port_ops;
1072 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1073
1074 visual_init(vc, currcons, true);
1075
1076 if (!*vc->uni_pagedict_loc)
1077 con_set_default_unimap(vc);
1078
1079 err = -EINVAL;
1080 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1081 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1082 goto err_free;
1083 err = -ENOMEM;
1084 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1085 if (!vc->vc_screenbuf)
1086 goto err_free;
1087
1088 /* If no drivers have overridden us and the user didn't pass a
1089 boot option, default to displaying the cursor */
1090 if (global_cursor_default == -1)
1091 global_cursor_default = 1;
1092
1093 vc_init(vc, 1);
1094 vcs_make_sysfs(currcons);
1095 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
1096
1097 return 0;
1098err_free:
1099 visual_deinit(vc);
1100 kfree(vc);
1101 vc_cons[currcons].d = NULL;
1102 return err;
1103}
1104
1105static inline int resize_screen(struct vc_data *vc, int width, int height,
1106 bool from_user)
1107{
1108 /* Resizes the resolution of the display adapater */
1109 int err = 0;
1110
1111 if (vc->vc_sw->con_resize)
1112 err = vc->vc_sw->con_resize(vc, width, height, from_user);
1113
1114 return err;
1115}
1116
1117/**
1118 * vc_do_resize - resizing method for the tty
1119 * @tty: tty being resized
1120 * @vc: virtual console private data
1121 * @cols: columns
1122 * @lines: lines
1123 * @from_user: invoked by a user?
1124 *
1125 * Resize a virtual console, clipping according to the actual constraints. If
1126 * the caller passes a tty structure then update the termios winsize
1127 * information and perform any necessary signal handling.
1128 *
1129 * Locking: Caller must hold the console semaphore. Takes the termios rwsem and
1130 * ctrl.lock of the tty IFF a tty is passed.
1131 */
1132static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1133 unsigned int cols, unsigned int lines, bool from_user)
1134{
1135 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1136 unsigned long end;
1137 unsigned int old_rows, old_row_size, first_copied_row;
1138 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1139 unsigned short *oldscreen, *newscreen;
1140 u32 **new_uniscr = NULL;
1141
1142 WARN_CONSOLE_UNLOCKED();
1143
1144 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1145 return -EINVAL;
1146
1147 new_cols = (cols ? cols : vc->vc_cols);
1148 new_rows = (lines ? lines : vc->vc_rows);
1149 new_row_size = new_cols << 1;
1150 new_screen_size = new_row_size * new_rows;
1151
1152 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1153 /*
1154 * This function is being called here to cover the case
1155 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1156 * passing the same fb_var_screeninfo containing the fields
1157 * yres/xres equal to a number non-multiple of vc_font.height
1158 * and yres_virtual/xres_virtual equal to number lesser than the
1159 * vc_font.height and yres/xres.
1160 * In the second call, the struct fb_var_screeninfo isn't
1161 * being modified by the underlying driver because of the
1162 * if above, and this causes the fbcon_display->vrows to become
1163 * negative and it eventually leads to out-of-bound
1164 * access by the imageblit function.
1165 * To give the correct values to the struct and to not have
1166 * to deal with possible errors from the code below, we call
1167 * the resize_screen here as well.
1168 */
1169 return resize_screen(vc, new_cols, new_rows, from_user);
1170 }
1171
1172 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1173 return -EINVAL;
1174 newscreen = kzalloc(new_screen_size, GFP_USER);
1175 if (!newscreen)
1176 return -ENOMEM;
1177
1178 if (vc->vc_uni_lines) {
1179 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1180 if (!new_uniscr) {
1181 kfree(newscreen);
1182 return -ENOMEM;
1183 }
1184 }
1185
1186 if (vc_is_sel(vc))
1187 clear_selection();
1188
1189 old_rows = vc->vc_rows;
1190 old_row_size = vc->vc_size_row;
1191
1192 err = resize_screen(vc, new_cols, new_rows, from_user);
1193 if (err) {
1194 kfree(newscreen);
1195 vc_uniscr_free(new_uniscr);
1196 return err;
1197 }
1198
1199 vc->vc_rows = new_rows;
1200 vc->vc_cols = new_cols;
1201 vc->vc_size_row = new_row_size;
1202 vc->vc_screenbuf_size = new_screen_size;
1203
1204 rlth = min(old_row_size, new_row_size);
1205 rrem = new_row_size - rlth;
1206 old_origin = vc->vc_origin;
1207 new_origin = (long) newscreen;
1208 new_scr_end = new_origin + new_screen_size;
1209
1210 if (vc->state.y > new_rows) {
1211 if (old_rows - vc->state.y < new_rows) {
1212 /*
1213 * Cursor near the bottom, copy contents from the
1214 * bottom of buffer
1215 */
1216 first_copied_row = (old_rows - new_rows);
1217 } else {
1218 /*
1219 * Cursor is in no man's land, copy 1/2 screenful
1220 * from the top and bottom of cursor position
1221 */
1222 first_copied_row = (vc->state.y - new_rows/2);
1223 }
1224 old_origin += first_copied_row * old_row_size;
1225 } else
1226 first_copied_row = 0;
1227 end = old_origin + old_row_size * min(old_rows, new_rows);
1228
1229 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1230 vc->vc_uni_lines, rlth/2, first_copied_row,
1231 min(old_rows, new_rows));
1232 vc_uniscr_set(vc, new_uniscr);
1233
1234 update_attr(vc);
1235
1236 while (old_origin < end) {
1237 scr_memcpyw((unsigned short *) new_origin,
1238 (unsigned short *) old_origin, rlth);
1239 if (rrem)
1240 scr_memsetw((void *)(new_origin + rlth),
1241 vc->vc_video_erase_char, rrem);
1242 old_origin += old_row_size;
1243 new_origin += new_row_size;
1244 }
1245 if (new_scr_end > new_origin)
1246 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1247 new_scr_end - new_origin);
1248 oldscreen = vc->vc_screenbuf;
1249 vc->vc_screenbuf = newscreen;
1250 vc->vc_screenbuf_size = new_screen_size;
1251 set_origin(vc);
1252 kfree(oldscreen);
1253
1254 /* do part of a reset_terminal() */
1255 vc->vc_top = 0;
1256 vc->vc_bottom = vc->vc_rows;
1257 gotoxy(vc, vc->state.x, vc->state.y);
1258 save_cur(vc);
1259
1260 if (tty) {
1261 /* Rewrite the requested winsize data with the actual
1262 resulting sizes */
1263 struct winsize ws;
1264 memset(&ws, 0, sizeof(ws));
1265 ws.ws_row = vc->vc_rows;
1266 ws.ws_col = vc->vc_cols;
1267 ws.ws_ypixel = vc->vc_scan_lines;
1268 tty_do_resize(tty, &ws);
1269 }
1270
1271 if (con_is_visible(vc))
1272 update_screen(vc);
1273 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1274 notify_update(vc);
1275 return err;
1276}
1277
1278/**
1279 * __vc_resize - resize a VT
1280 * @vc: virtual console
1281 * @cols: columns
1282 * @rows: rows
1283 * @from_user: invoked by a user?
1284 *
1285 * Resize a virtual console as seen from the console end of things. We use the
1286 * common vc_do_resize() method to update the structures.
1287 *
1288 * Locking: The caller must hold the console sem to protect console internals
1289 * and @vc->port.tty.
1290 */
1291int __vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows,
1292 bool from_user)
1293{
1294 return vc_do_resize(vc->port.tty, vc, cols, rows, from_user);
1295}
1296EXPORT_SYMBOL(__vc_resize);
1297
1298/**
1299 * vt_resize - resize a VT
1300 * @tty: tty to resize
1301 * @ws: winsize attributes
1302 *
1303 * Resize a virtual terminal. This is called by the tty layer as we register
1304 * our own handler for resizing. The mutual helper does all the actual work.
1305 *
1306 * Locking: Takes the console sem and the called methods then take the tty
1307 * termios_rwsem and the tty ctrl.lock in that order.
1308 */
1309static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1310{
1311 struct vc_data *vc = tty->driver_data;
1312 int ret;
1313
1314 console_lock();
1315 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row, false);
1316 console_unlock();
1317 return ret;
1318}
1319
1320struct vc_data *vc_deallocate(unsigned int currcons)
1321{
1322 struct vc_data *vc = NULL;
1323
1324 WARN_CONSOLE_UNLOCKED();
1325
1326 if (vc_cons_allocated(currcons)) {
1327 struct vt_notifier_param param;
1328
1329 param.vc = vc = vc_cons[currcons].d;
1330 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1331 vcs_remove_sysfs(currcons);
1332 visual_deinit(vc);
1333 con_free_unimap(vc);
1334 put_pid(vc->vt_pid);
1335 vc_uniscr_set(vc, NULL);
1336 kfree(vc->vc_screenbuf);
1337 vc_cons[currcons].d = NULL;
1338 }
1339 return vc;
1340}
1341
1342/*
1343 * VT102 emulator
1344 */
1345
1346enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1347
1348#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1349#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1350#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1351
1352#define decarm VC_REPEAT
1353#define decckm VC_CKMODE
1354#define kbdapplic VC_APPLIC
1355#define lnm VC_CRLF
1356
1357const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1358 8,12,10,14, 9,13,11,15 };
1359EXPORT_SYMBOL(color_table);
1360
1361/* the default colour table, for VGA+ colour systems */
1362unsigned char default_red[] = {
1363 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1364 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1365};
1366module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1367EXPORT_SYMBOL(default_red);
1368
1369unsigned char default_grn[] = {
1370 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1371 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1372};
1373module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1374EXPORT_SYMBOL(default_grn);
1375
1376unsigned char default_blu[] = {
1377 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1378 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1379};
1380module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1381EXPORT_SYMBOL(default_blu);
1382
1383/*
1384 * gotoxy() must verify all boundaries, because the arguments
1385 * might also be negative. If the given position is out of
1386 * bounds, the cursor is placed at the nearest margin.
1387 */
1388static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1389{
1390 int min_y, max_y;
1391
1392 if (new_x < 0)
1393 vc->state.x = 0;
1394 else {
1395 if (new_x >= vc->vc_cols)
1396 vc->state.x = vc->vc_cols - 1;
1397 else
1398 vc->state.x = new_x;
1399 }
1400
1401 if (vc->vc_decom) {
1402 min_y = vc->vc_top;
1403 max_y = vc->vc_bottom;
1404 } else {
1405 min_y = 0;
1406 max_y = vc->vc_rows;
1407 }
1408 if (new_y < min_y)
1409 vc->state.y = min_y;
1410 else if (new_y >= max_y)
1411 vc->state.y = max_y - 1;
1412 else
1413 vc->state.y = new_y;
1414 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1415 (vc->state.x << 1);
1416 vc->vc_need_wrap = 0;
1417}
1418
1419/* for absolute user moves, when decom is set */
1420static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1421{
1422 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1423}
1424
1425void scrollback(struct vc_data *vc)
1426{
1427 scrolldelta(-(vc->vc_rows / 2));
1428}
1429
1430void scrollfront(struct vc_data *vc, int lines)
1431{
1432 if (!lines)
1433 lines = vc->vc_rows / 2;
1434 scrolldelta(lines);
1435}
1436
1437static void lf(struct vc_data *vc)
1438{
1439 /* don't scroll if above bottom of scrolling region, or
1440 * if below scrolling region
1441 */
1442 if (vc->state.y + 1 == vc->vc_bottom)
1443 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1444 else if (vc->state.y < vc->vc_rows - 1) {
1445 vc->state.y++;
1446 vc->vc_pos += vc->vc_size_row;
1447 }
1448 vc->vc_need_wrap = 0;
1449 notify_write(vc, '\n');
1450}
1451
1452static void ri(struct vc_data *vc)
1453{
1454 /* don't scroll if below top of scrolling region, or
1455 * if above scrolling region
1456 */
1457 if (vc->state.y == vc->vc_top)
1458 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1459 else if (vc->state.y > 0) {
1460 vc->state.y--;
1461 vc->vc_pos -= vc->vc_size_row;
1462 }
1463 vc->vc_need_wrap = 0;
1464}
1465
1466static inline void cr(struct vc_data *vc)
1467{
1468 vc->vc_pos -= vc->state.x << 1;
1469 vc->vc_need_wrap = vc->state.x = 0;
1470 notify_write(vc, '\r');
1471}
1472
1473static inline void bs(struct vc_data *vc)
1474{
1475 if (vc->state.x) {
1476 vc->vc_pos -= 2;
1477 vc->state.x--;
1478 vc->vc_need_wrap = 0;
1479 notify_write(vc, '\b');
1480 }
1481}
1482
1483static inline void del(struct vc_data *vc)
1484{
1485 /* ignored */
1486}
1487
1488enum CSI_J {
1489 CSI_J_CURSOR_TO_END = 0,
1490 CSI_J_START_TO_CURSOR = 1,
1491 CSI_J_VISIBLE = 2,
1492 CSI_J_FULL = 3,
1493};
1494
1495static void csi_J(struct vc_data *vc, enum CSI_J vpar)
1496{
1497 unsigned short *start;
1498 unsigned int count;
1499
1500 switch (vpar) {
1501 case CSI_J_CURSOR_TO_END:
1502 vc_uniscr_clear_line(vc, vc->state.x,
1503 vc->vc_cols - vc->state.x);
1504 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1505 vc->vc_rows - vc->state.y - 1);
1506 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1507 start = (unsigned short *)vc->vc_pos;
1508 break;
1509 case CSI_J_START_TO_CURSOR:
1510 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1511 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1512 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1513 start = (unsigned short *)vc->vc_origin;
1514 break;
1515 case CSI_J_FULL:
1516 flush_scrollback(vc);
1517 fallthrough;
1518 case CSI_J_VISIBLE:
1519 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1520 count = vc->vc_cols * vc->vc_rows;
1521 start = (unsigned short *)vc->vc_origin;
1522 break;
1523 default:
1524 return;
1525 }
1526 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1527 if (con_should_update(vc))
1528 do_update_region(vc, (unsigned long) start, count);
1529 vc->vc_need_wrap = 0;
1530}
1531
1532enum {
1533 CSI_K_CURSOR_TO_LINEEND = 0,
1534 CSI_K_LINESTART_TO_CURSOR = 1,
1535 CSI_K_LINE = 2,
1536};
1537
1538static void csi_K(struct vc_data *vc)
1539{
1540 unsigned int count;
1541 unsigned short *start = (unsigned short *)vc->vc_pos;
1542 int offset;
1543
1544 switch (vc->vc_par[0]) {
1545 case CSI_K_CURSOR_TO_LINEEND:
1546 offset = 0;
1547 count = vc->vc_cols - vc->state.x;
1548 break;
1549 case CSI_K_LINESTART_TO_CURSOR:
1550 offset = -vc->state.x;
1551 count = vc->state.x + 1;
1552 break;
1553 case CSI_K_LINE:
1554 offset = -vc->state.x;
1555 count = vc->vc_cols;
1556 break;
1557 default:
1558 return;
1559 }
1560 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
1561 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1562 vc->vc_need_wrap = 0;
1563 if (con_should_update(vc))
1564 do_update_region(vc, (unsigned long)(start + offset), count);
1565}
1566
1567/* erase the following count positions */
1568static void csi_X(struct vc_data *vc)
1569{ /* not vt100? */
1570 unsigned int count = clamp(vc->vc_par[0], 1, vc->vc_cols - vc->state.x);
1571
1572 vc_uniscr_clear_line(vc, vc->state.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->state.y, vc->state.x, count);
1576 vc->vc_need_wrap = 0;
1577}
1578
1579static void default_attr(struct vc_data *vc)
1580{
1581 vc->state.intensity = VCI_NORMAL;
1582 vc->state.italic = false;
1583 vc->state.underline = false;
1584 vc->state.reverse = false;
1585 vc->state.blink = false;
1586 vc->state.color = vc->vc_def_color;
1587}
1588
1589struct rgb { u8 r; u8 g; u8 b; };
1590
1591static void rgb_from_256(unsigned 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 i -= 16;
1603 c->b = i % 6 * 255 / 6;
1604 i /= 6;
1605 c->g = i % 6 * 255 / 6;
1606 i /= 6;
1607 c->r = i * 255 / 6;
1608 } else /* Grayscale ramp. */
1609 c->r = c->g = c->b = i * 10 - 2312;
1610}
1611
1612static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1613{
1614 u8 hue = 0, max = max3(c->r, c->g, c->b);
1615
1616 if (c->r > max / 2)
1617 hue |= 4;
1618 if (c->g > max / 2)
1619 hue |= 2;
1620 if (c->b > max / 2)
1621 hue |= 1;
1622
1623 if (hue == 7 && max <= 0x55) {
1624 hue = 0;
1625 vc->state.intensity = VCI_BOLD;
1626 } else if (max > 0xaa)
1627 vc->state.intensity = VCI_BOLD;
1628 else
1629 vc->state.intensity = VCI_NORMAL;
1630
1631 vc->state.color = (vc->state.color & 0xf0) | hue;
1632}
1633
1634static void rgb_background(struct vc_data *vc, const struct rgb *c)
1635{
1636 /* For backgrounds, err on the dark side. */
1637 vc->state.color = (vc->state.color & 0x0f)
1638 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1639}
1640
1641/*
1642 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1643 * and thus need to be detected and ignored by hand. That standard also
1644 * wants : rather than ; as separators but sequences containing : are currently
1645 * completely ignored by the parser.
1646 *
1647 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1648 * supporting them.
1649 */
1650static int vc_t416_color(struct vc_data *vc, int i,
1651 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1652{
1653 struct rgb c;
1654
1655 i++;
1656 if (i > vc->vc_npar)
1657 return i;
1658
1659 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1660 /* 256 colours */
1661 i++;
1662 rgb_from_256(vc->vc_par[i], &c);
1663 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1664 /* 24 bit */
1665 c.r = vc->vc_par[i + 1];
1666 c.g = vc->vc_par[i + 2];
1667 c.b = vc->vc_par[i + 3];
1668 i += 3;
1669 } else
1670 return i;
1671
1672 set_color(vc, &c);
1673
1674 return i;
1675}
1676
1677enum {
1678 CSI_m_DEFAULT = 0,
1679 CSI_m_BOLD = 1,
1680 CSI_m_HALF_BRIGHT = 2,
1681 CSI_m_ITALIC = 3,
1682 CSI_m_UNDERLINE = 4,
1683 CSI_m_BLINK = 5,
1684 CSI_m_REVERSE = 7,
1685 CSI_m_PRI_FONT = 10,
1686 CSI_m_ALT_FONT1 = 11,
1687 CSI_m_ALT_FONT2 = 12,
1688 CSI_m_DOUBLE_UNDERLINE = 21,
1689 CSI_m_NORMAL_INTENSITY = 22,
1690 CSI_m_NO_ITALIC = 23,
1691 CSI_m_NO_UNDERLINE = 24,
1692 CSI_m_NO_BLINK = 25,
1693 CSI_m_NO_REVERSE = 27,
1694 CSI_m_FG_COLOR_BEG = 30,
1695 CSI_m_FG_COLOR_END = 37,
1696 CSI_m_FG_COLOR = 38,
1697 CSI_m_DEFAULT_FG_COLOR = 39,
1698 CSI_m_BG_COLOR_BEG = 40,
1699 CSI_m_BG_COLOR_END = 47,
1700 CSI_m_BG_COLOR = 48,
1701 CSI_m_DEFAULT_BG_COLOR = 49,
1702 CSI_m_BRIGHT_FG_COLOR_BEG = 90,
1703 CSI_m_BRIGHT_FG_COLOR_END = 97,
1704 CSI_m_BRIGHT_FG_COLOR_OFF = CSI_m_BRIGHT_FG_COLOR_BEG - CSI_m_FG_COLOR_BEG,
1705 CSI_m_BRIGHT_BG_COLOR_BEG = 100,
1706 CSI_m_BRIGHT_BG_COLOR_END = 107,
1707 CSI_m_BRIGHT_BG_COLOR_OFF = CSI_m_BRIGHT_BG_COLOR_BEG - CSI_m_BG_COLOR_BEG,
1708};
1709
1710/* console_lock is held */
1711static void csi_m(struct vc_data *vc)
1712{
1713 int i;
1714
1715 for (i = 0; i <= vc->vc_npar; i++)
1716 switch (vc->vc_par[i]) {
1717 case CSI_m_DEFAULT: /* all attributes off */
1718 default_attr(vc);
1719 break;
1720 case CSI_m_BOLD:
1721 vc->state.intensity = VCI_BOLD;
1722 break;
1723 case CSI_m_HALF_BRIGHT:
1724 vc->state.intensity = VCI_HALF_BRIGHT;
1725 break;
1726 case CSI_m_ITALIC:
1727 vc->state.italic = true;
1728 break;
1729 case CSI_m_DOUBLE_UNDERLINE:
1730 /*
1731 * No console drivers support double underline, so
1732 * convert it to a single underline.
1733 */
1734 case CSI_m_UNDERLINE:
1735 vc->state.underline = true;
1736 break;
1737 case CSI_m_BLINK:
1738 vc->state.blink = true;
1739 break;
1740 case CSI_m_REVERSE:
1741 vc->state.reverse = true;
1742 break;
1743 case CSI_m_PRI_FONT: /* ANSI X3.64-1979 (SCO-ish?)
1744 * Select primary font, don't display control chars if
1745 * defined, don't set bit 8 on output.
1746 */
1747 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
1748 vc->vc_disp_ctrl = 0;
1749 vc->vc_toggle_meta = 0;
1750 break;
1751 case CSI_m_ALT_FONT1: /* ANSI X3.64-1979 (SCO-ish?)
1752 * Select first alternate font, lets chars < 32 be
1753 * displayed as ROM chars.
1754 */
1755 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1756 vc->vc_disp_ctrl = 1;
1757 vc->vc_toggle_meta = 0;
1758 break;
1759 case CSI_m_ALT_FONT2: /* ANSI X3.64-1979 (SCO-ish?)
1760 * Select second alternate font, toggle high bit
1761 * before displaying as ROM char.
1762 */
1763 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1764 vc->vc_disp_ctrl = 1;
1765 vc->vc_toggle_meta = 1;
1766 break;
1767 case CSI_m_NORMAL_INTENSITY:
1768 vc->state.intensity = VCI_NORMAL;
1769 break;
1770 case CSI_m_NO_ITALIC:
1771 vc->state.italic = false;
1772 break;
1773 case CSI_m_NO_UNDERLINE:
1774 vc->state.underline = false;
1775 break;
1776 case CSI_m_NO_BLINK:
1777 vc->state.blink = false;
1778 break;
1779 case CSI_m_NO_REVERSE:
1780 vc->state.reverse = false;
1781 break;
1782 case CSI_m_FG_COLOR:
1783 i = vc_t416_color(vc, i, rgb_foreground);
1784 break;
1785 case CSI_m_BG_COLOR:
1786 i = vc_t416_color(vc, i, rgb_background);
1787 break;
1788 case CSI_m_DEFAULT_FG_COLOR:
1789 vc->state.color = (vc->vc_def_color & 0x0f) |
1790 (vc->state.color & 0xf0);
1791 break;
1792 case CSI_m_DEFAULT_BG_COLOR:
1793 vc->state.color = (vc->vc_def_color & 0xf0) |
1794 (vc->state.color & 0x0f);
1795 break;
1796 case CSI_m_BRIGHT_FG_COLOR_BEG ... CSI_m_BRIGHT_FG_COLOR_END:
1797 vc->state.intensity = VCI_BOLD;
1798 vc->vc_par[i] -= CSI_m_BRIGHT_FG_COLOR_OFF;
1799 fallthrough;
1800 case CSI_m_FG_COLOR_BEG ... CSI_m_FG_COLOR_END:
1801 vc->vc_par[i] -= CSI_m_FG_COLOR_BEG;
1802 vc->state.color = color_table[vc->vc_par[i]] |
1803 (vc->state.color & 0xf0);
1804 break;
1805 case CSI_m_BRIGHT_BG_COLOR_BEG ... CSI_m_BRIGHT_BG_COLOR_END:
1806 vc->vc_par[i] -= CSI_m_BRIGHT_BG_COLOR_OFF;
1807 fallthrough;
1808 case CSI_m_BG_COLOR_BEG ... CSI_m_BG_COLOR_END:
1809 vc->vc_par[i] -= CSI_m_BG_COLOR_BEG;
1810 vc->state.color = (color_table[vc->vc_par[i]] << 4) |
1811 (vc->state.color & 0x0f);
1812 break;
1813 }
1814 update_attr(vc);
1815}
1816
1817static void respond_string(const char *p, size_t len, struct tty_port *port)
1818{
1819 tty_insert_flip_string(port, p, len);
1820 tty_flip_buffer_push(port);
1821}
1822
1823static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1824{
1825 char buf[40];
1826 int len;
1827
1828 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1829 (vc->vc_decom ? vc->vc_top + 1 : 1),
1830 vc->state.x + 1);
1831 respond_string(buf, len, tty->port);
1832}
1833
1834static inline void status_report(struct tty_struct *tty)
1835{
1836 static const char teminal_ok[] = "\033[0n";
1837
1838 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1839}
1840
1841static inline void respond_ID(struct tty_struct *tty)
1842{
1843 /* terminal answer to an ESC-Z or csi0c query. */
1844 static const char vt102_id[] = "\033[?6c";
1845
1846 respond_string(vt102_id, strlen(vt102_id), tty->port);
1847}
1848
1849void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1850{
1851 char buf[8];
1852 int len;
1853
1854 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1855 (char)('!' + mrx), (char)('!' + mry));
1856 respond_string(buf, len, tty->port);
1857}
1858
1859/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1860int mouse_reporting(void)
1861{
1862 return vc_cons[fg_console].d->vc_report_mouse;
1863}
1864
1865enum {
1866 CSI_DEC_hl_CURSOR_KEYS = 1, /* CKM: cursor keys send ^[Ox/^[[x */
1867 CSI_DEC_hl_132_COLUMNS = 3, /* COLM: 80/132 mode switch */
1868 CSI_DEC_hl_REVERSE_VIDEO = 5, /* SCNM */
1869 CSI_DEC_hl_ORIGIN_MODE = 6, /* OM: origin relative/absolute */
1870 CSI_DEC_hl_AUTOWRAP = 7, /* AWM */
1871 CSI_DEC_hl_AUTOREPEAT = 8, /* ARM */
1872 CSI_DEC_hl_MOUSE_X10 = 9,
1873 CSI_DEC_hl_SHOW_CURSOR = 25, /* TCEM */
1874 CSI_DEC_hl_MOUSE_VT200 = 1000,
1875};
1876
1877/* console_lock is held */
1878static void csi_DEC_hl(struct vc_data *vc, bool on_off)
1879{
1880 unsigned int i;
1881
1882 for (i = 0; i <= vc->vc_npar; i++)
1883 switch (vc->vc_par[i]) {
1884 case CSI_DEC_hl_CURSOR_KEYS:
1885 if (on_off)
1886 set_kbd(vc, decckm);
1887 else
1888 clr_kbd(vc, decckm);
1889 break;
1890 case CSI_DEC_hl_132_COLUMNS: /* unimplemented */
1891#if 0
1892 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1893 /* this alone does not suffice; some user mode
1894 utility has to change the hardware regs */
1895#endif
1896 break;
1897 case CSI_DEC_hl_REVERSE_VIDEO:
1898 if (vc->vc_decscnm != on_off) {
1899 vc->vc_decscnm = on_off;
1900 invert_screen(vc, 0, vc->vc_screenbuf_size,
1901 false);
1902 update_attr(vc);
1903 }
1904 break;
1905 case CSI_DEC_hl_ORIGIN_MODE:
1906 vc->vc_decom = on_off;
1907 gotoxay(vc, 0, 0);
1908 break;
1909 case CSI_DEC_hl_AUTOWRAP:
1910 vc->vc_decawm = on_off;
1911 break;
1912 case CSI_DEC_hl_AUTOREPEAT:
1913 if (on_off)
1914 set_kbd(vc, decarm);
1915 else
1916 clr_kbd(vc, decarm);
1917 break;
1918 case CSI_DEC_hl_MOUSE_X10:
1919 vc->vc_report_mouse = on_off ? 1 : 0;
1920 break;
1921 case CSI_DEC_hl_SHOW_CURSOR:
1922 vc->vc_deccm = on_off;
1923 break;
1924 case CSI_DEC_hl_MOUSE_VT200:
1925 vc->vc_report_mouse = on_off ? 2 : 0;
1926 break;
1927 }
1928}
1929
1930enum {
1931 CSI_hl_DISPLAY_CTRL = 3, /* handle ansi control chars */
1932 CSI_hl_INSERT = 4, /* IRM: insert/replace */
1933 CSI_hl_AUTO_NL = 20, /* LNM: Enter == CrLf/Lf */
1934};
1935
1936/* console_lock is held */
1937static void csi_hl(struct vc_data *vc, bool on_off)
1938{
1939 unsigned int i;
1940
1941 for (i = 0; i <= vc->vc_npar; i++)
1942 switch (vc->vc_par[i]) { /* ANSI modes set/reset */
1943 case CSI_hl_DISPLAY_CTRL:
1944 vc->vc_disp_ctrl = on_off;
1945 break;
1946 case CSI_hl_INSERT:
1947 vc->vc_decim = on_off;
1948 break;
1949 case CSI_hl_AUTO_NL:
1950 if (on_off)
1951 set_kbd(vc, lnm);
1952 else
1953 clr_kbd(vc, lnm);
1954 break;
1955 }
1956}
1957
1958enum CSI_right_square_bracket {
1959 CSI_RSB_COLOR_FOR_UNDERLINE = 1,
1960 CSI_RSB_COLOR_FOR_HALF_BRIGHT = 2,
1961 CSI_RSB_MAKE_CUR_COLOR_DEFAULT = 8,
1962 CSI_RSB_BLANKING_INTERVAL = 9,
1963 CSI_RSB_BELL_FREQUENCY = 10,
1964 CSI_RSB_BELL_DURATION = 11,
1965 CSI_RSB_BRING_CONSOLE_TO_FRONT = 12,
1966 CSI_RSB_UNBLANK = 13,
1967 CSI_RSB_VESA_OFF_INTERVAL = 14,
1968 CSI_RSB_BRING_PREV_CONSOLE_TO_FRONT = 15,
1969 CSI_RSB_CURSOR_BLINK_INTERVAL = 16,
1970};
1971
1972/*
1973 * csi_RSB - csi+] (Right Square Bracket) handler
1974 *
1975 * These are linux console private sequences.
1976 *
1977 * console_lock is held
1978 */
1979static void csi_RSB(struct vc_data *vc)
1980{
1981 switch (vc->vc_par[0]) {
1982 case CSI_RSB_COLOR_FOR_UNDERLINE:
1983 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1984 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1985 if (vc->state.underline)
1986 update_attr(vc);
1987 }
1988 break;
1989 case CSI_RSB_COLOR_FOR_HALF_BRIGHT:
1990 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1991 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1992 if (vc->state.intensity == VCI_HALF_BRIGHT)
1993 update_attr(vc);
1994 }
1995 break;
1996 case CSI_RSB_MAKE_CUR_COLOR_DEFAULT:
1997 vc->vc_def_color = vc->vc_attr;
1998 if (vc->vc_hi_font_mask == 0x100)
1999 vc->vc_def_color >>= 1;
2000 default_attr(vc);
2001 update_attr(vc);
2002 break;
2003 case CSI_RSB_BLANKING_INTERVAL:
2004 blankinterval = min(vc->vc_par[1], 60U) * 60;
2005 poke_blanked_console();
2006 break;
2007 case CSI_RSB_BELL_FREQUENCY:
2008 if (vc->vc_npar >= 1)
2009 vc->vc_bell_pitch = vc->vc_par[1];
2010 else
2011 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2012 break;
2013 case CSI_RSB_BELL_DURATION:
2014 if (vc->vc_npar >= 1)
2015 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
2016 msecs_to_jiffies(vc->vc_par[1]) : 0;
2017 else
2018 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2019 break;
2020 case CSI_RSB_BRING_CONSOLE_TO_FRONT:
2021 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
2022 set_console(vc->vc_par[1] - 1);
2023 break;
2024 case CSI_RSB_UNBLANK:
2025 poke_blanked_console();
2026 break;
2027 case CSI_RSB_VESA_OFF_INTERVAL:
2028 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
2029 break;
2030 case CSI_RSB_BRING_PREV_CONSOLE_TO_FRONT:
2031 set_console(last_console);
2032 break;
2033 case CSI_RSB_CURSOR_BLINK_INTERVAL:
2034 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
2035 vc->vc_par[1] <= USHRT_MAX)
2036 vc->vc_cur_blink_ms = vc->vc_par[1];
2037 else
2038 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2039 break;
2040 }
2041}
2042
2043/* console_lock is held */
2044static void csi_at(struct vc_data *vc, unsigned int nr)
2045{
2046 nr = clamp(nr, 1, vc->vc_cols - vc->state.x);
2047 insert_char(vc, nr);
2048}
2049
2050/* console_lock is held */
2051static void csi_L(struct vc_data *vc)
2052{
2053 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_rows - vc->state.y);
2054
2055 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
2056 vc->vc_need_wrap = 0;
2057}
2058
2059/* console_lock is held */
2060static void csi_P(struct vc_data *vc)
2061{
2062 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_cols - vc->state.x);
2063
2064 delete_char(vc, nr);
2065}
2066
2067/* console_lock is held */
2068static void csi_M(struct vc_data *vc)
2069{
2070 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_rows - vc->state.y);
2071
2072 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
2073 vc->vc_need_wrap = 0;
2074}
2075
2076/* console_lock is held (except via vc_init->reset_terminal */
2077static void save_cur(struct vc_data *vc)
2078{
2079 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
2080}
2081
2082/* console_lock is held */
2083static void restore_cur(struct vc_data *vc)
2084{
2085 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2086
2087 gotoxy(vc, vc->state.x, vc->state.y);
2088 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2089 vc);
2090 update_attr(vc);
2091 vc->vc_need_wrap = 0;
2092}
2093
2094/**
2095 * enum vc_ctl_state - control characters state of a vt
2096 *
2097 * @ESnormal: initial state, no control characters parsed
2098 * @ESesc: ESC parsed
2099 * @ESsquare: CSI parsed -- modifiers/parameters/ctrl chars expected
2100 * @ESgetpars: CSI parsed -- parameters/ctrl chars expected
2101 * @ESfunckey: CSI [ parsed
2102 * @EShash: ESC # parsed
2103 * @ESsetG0: ESC ( parsed
2104 * @ESsetG1: ESC ) parsed
2105 * @ESpercent: ESC % parsed
2106 * @EScsiignore: CSI [0x20-0x3f] parsed
2107 * @ESnonstd: OSC parsed
2108 * @ESpalette: OSC P parsed
2109 * @ESosc: OSC [0-9] parsed
2110 * @ESANSI_first: first state for ignoring ansi control sequences
2111 * @ESapc: ESC _ parsed
2112 * @ESpm: ESC ^ parsed
2113 * @ESdcs: ESC P parsed
2114 * @ESANSI_last: last state for ignoring ansi control sequences
2115 */
2116enum vc_ctl_state {
2117 ESnormal,
2118 ESesc,
2119 ESsquare,
2120 ESgetpars,
2121 ESfunckey,
2122 EShash,
2123 ESsetG0,
2124 ESsetG1,
2125 ESpercent,
2126 EScsiignore,
2127 ESnonstd,
2128 ESpalette,
2129 ESosc,
2130 ESANSI_first = ESosc,
2131 ESapc,
2132 ESpm,
2133 ESdcs,
2134 ESANSI_last = ESdcs,
2135};
2136
2137/* console_lock is held (except via vc_init()) */
2138static void reset_terminal(struct vc_data *vc, int do_clear)
2139{
2140 unsigned int i;
2141
2142 vc->vc_top = 0;
2143 vc->vc_bottom = vc->vc_rows;
2144 vc->vc_state = ESnormal;
2145 vc->vc_priv = EPecma;
2146 vc->vc_translate = set_translate(LAT1_MAP, vc);
2147 vc->state.Gx_charset[0] = LAT1_MAP;
2148 vc->state.Gx_charset[1] = GRAF_MAP;
2149 vc->state.charset = 0;
2150 vc->vc_need_wrap = 0;
2151 vc->vc_report_mouse = 0;
2152 vc->vc_utf = default_utf8;
2153 vc->vc_utf_count = 0;
2154
2155 vc->vc_disp_ctrl = 0;
2156 vc->vc_toggle_meta = 0;
2157
2158 vc->vc_decscnm = 0;
2159 vc->vc_decom = 0;
2160 vc->vc_decawm = 1;
2161 vc->vc_deccm = global_cursor_default;
2162 vc->vc_decim = 0;
2163
2164 vt_reset_keyboard(vc->vc_num);
2165
2166 vc->vc_cursor_type = cur_default;
2167 vc->vc_complement_mask = vc->vc_s_complement_mask;
2168
2169 default_attr(vc);
2170 update_attr(vc);
2171
2172 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2173 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2174 set_bit(i, vc->vc_tab_stop);
2175
2176 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2177 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2178 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2179
2180 gotoxy(vc, 0, 0);
2181 save_cur(vc);
2182 if (do_clear)
2183 csi_J(vc, CSI_J_VISIBLE);
2184}
2185
2186static void vc_setGx(struct vc_data *vc, unsigned int which, u8 c)
2187{
2188 unsigned char *charset = &vc->state.Gx_charset[which];
2189
2190 switch (c) {
2191 case '0':
2192 *charset = GRAF_MAP;
2193 break;
2194 case 'B':
2195 *charset = LAT1_MAP;
2196 break;
2197 case 'U':
2198 *charset = IBMPC_MAP;
2199 break;
2200 case 'K':
2201 *charset = USER_MAP;
2202 break;
2203 }
2204
2205 if (vc->state.charset == which)
2206 vc->vc_translate = set_translate(*charset, vc);
2207}
2208
2209static bool ansi_control_string(enum vc_ctl_state state)
2210{
2211 return state >= ESANSI_first && state <= ESANSI_last;
2212}
2213
2214enum {
2215 ASCII_NULL = 0,
2216 ASCII_BELL = 7,
2217 ASCII_BACKSPACE = 8,
2218 ASCII_IGNORE_FIRST = ASCII_BACKSPACE,
2219 ASCII_HTAB = 9,
2220 ASCII_LINEFEED = 10,
2221 ASCII_VTAB = 11,
2222 ASCII_FORMFEED = 12,
2223 ASCII_CAR_RET = 13,
2224 ASCII_IGNORE_LAST = ASCII_CAR_RET,
2225 ASCII_SHIFTOUT = 14,
2226 ASCII_SHIFTIN = 15,
2227 ASCII_CANCEL = 24,
2228 ASCII_SUBSTITUTE = 26,
2229 ASCII_ESCAPE = 27,
2230 ASCII_CSI_IGNORE_FIRST = ' ', /* 0x2x, 0x3a and 0x3c - 0x3f */
2231 ASCII_CSI_IGNORE_LAST = '?',
2232 ASCII_DEL = 127,
2233 ASCII_EXT_CSI = 128 + ASCII_ESCAPE,
2234};
2235
2236/*
2237 * Handle ascii characters in control sequences and change states accordingly.
2238 * E.g. ESC sets the state of vc to ESesc.
2239 *
2240 * Returns: true if @c handled.
2241 */
2242static bool handle_ascii(struct tty_struct *tty, struct vc_data *vc, u8 c)
2243{
2244 switch (c) {
2245 case ASCII_NULL:
2246 return true;
2247 case ASCII_BELL:
2248 if (ansi_control_string(vc->vc_state))
2249 vc->vc_state = ESnormal;
2250 else if (vc->vc_bell_duration)
2251 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2252 return true;
2253 case ASCII_BACKSPACE:
2254 bs(vc);
2255 return true;
2256 case ASCII_HTAB:
2257 vc->vc_pos -= (vc->state.x << 1);
2258
2259 vc->state.x = find_next_bit(vc->vc_tab_stop,
2260 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2261 vc->state.x + 1);
2262 if (vc->state.x >= VC_TABSTOPS_COUNT)
2263 vc->state.x = vc->vc_cols - 1;
2264
2265 vc->vc_pos += (vc->state.x << 1);
2266 notify_write(vc, '\t');
2267 return true;
2268 case ASCII_LINEFEED:
2269 case ASCII_VTAB:
2270 case ASCII_FORMFEED:
2271 lf(vc);
2272 if (!is_kbd(vc, lnm))
2273 return true;
2274 fallthrough;
2275 case ASCII_CAR_RET:
2276 cr(vc);
2277 return true;
2278 case ASCII_SHIFTOUT:
2279 vc->state.charset = 1;
2280 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
2281 vc->vc_disp_ctrl = 1;
2282 return true;
2283 case ASCII_SHIFTIN:
2284 vc->state.charset = 0;
2285 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
2286 vc->vc_disp_ctrl = 0;
2287 return true;
2288 case ASCII_CANCEL:
2289 case ASCII_SUBSTITUTE:
2290 vc->vc_state = ESnormal;
2291 return true;
2292 case ASCII_ESCAPE:
2293 vc->vc_state = ESesc;
2294 return true;
2295 case ASCII_DEL:
2296 del(vc);
2297 return true;
2298 case ASCII_EXT_CSI:
2299 vc->vc_state = ESsquare;
2300 return true;
2301 }
2302
2303 return false;
2304}
2305
2306/*
2307 * Handle a character (@c) following an ESC (when @vc is in the ESesc state).
2308 * E.g. previous ESC with @c == '[' here yields the ESsquare state (that is:
2309 * CSI).
2310 */
2311static void handle_esc(struct tty_struct *tty, struct vc_data *vc, u8 c)
2312{
2313 vc->vc_state = ESnormal;
2314 switch (c) {
2315 case '[':
2316 vc->vc_state = ESsquare;
2317 break;
2318 case ']':
2319 vc->vc_state = ESnonstd;
2320 break;
2321 case '_':
2322 vc->vc_state = ESapc;
2323 break;
2324 case '^':
2325 vc->vc_state = ESpm;
2326 break;
2327 case '%':
2328 vc->vc_state = ESpercent;
2329 break;
2330 case 'E':
2331 cr(vc);
2332 lf(vc);
2333 break;
2334 case 'M':
2335 ri(vc);
2336 break;
2337 case 'D':
2338 lf(vc);
2339 break;
2340 case 'H':
2341 if (vc->state.x < VC_TABSTOPS_COUNT)
2342 set_bit(vc->state.x, vc->vc_tab_stop);
2343 break;
2344 case 'P':
2345 vc->vc_state = ESdcs;
2346 break;
2347 case 'Z':
2348 respond_ID(tty);
2349 break;
2350 case '7':
2351 save_cur(vc);
2352 break;
2353 case '8':
2354 restore_cur(vc);
2355 break;
2356 case '(':
2357 vc->vc_state = ESsetG0;
2358 break;
2359 case ')':
2360 vc->vc_state = ESsetG1;
2361 break;
2362 case '#':
2363 vc->vc_state = EShash;
2364 break;
2365 case 'c':
2366 reset_terminal(vc, 1);
2367 break;
2368 case '>': /* Numeric keypad */
2369 clr_kbd(vc, kbdapplic);
2370 break;
2371 case '=': /* Appl. keypad */
2372 set_kbd(vc, kbdapplic);
2373 break;
2374 }
2375}
2376
2377/*
2378 * Handle special DEC control sequences ("ESC [ ? parameters char"). Parameters
2379 * are in @vc->vc_par and the char is in @c here.
2380 */
2381static void csi_DEC(struct tty_struct *tty, struct vc_data *vc, u8 c)
2382{
2383 switch (c) {
2384 case 'h':
2385 csi_DEC_hl(vc, true);
2386 break;
2387 case 'l':
2388 csi_DEC_hl(vc, false);
2389 break;
2390 case 'c':
2391 if (vc->vc_par[0])
2392 vc->vc_cursor_type = CUR_MAKE(vc->vc_par[0],
2393 vc->vc_par[1],
2394 vc->vc_par[2]);
2395 else
2396 vc->vc_cursor_type = cur_default;
2397 break;
2398 case 'm':
2399 clear_selection();
2400 if (vc->vc_par[0])
2401 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2402 else
2403 vc->vc_complement_mask = vc->vc_s_complement_mask;
2404 break;
2405 case 'n':
2406 if (vc->vc_par[0] == 5)
2407 status_report(tty);
2408 else if (vc->vc_par[0] == 6)
2409 cursor_report(vc, tty);
2410 break;
2411 }
2412}
2413
2414/*
2415 * Handle Control Sequence Introducer control characters. That is
2416 * "ESC [ parameters char". Parameters are in @vc->vc_par and the char is in
2417 * @c here.
2418 */
2419static void csi_ECMA(struct tty_struct *tty, struct vc_data *vc, u8 c)
2420{
2421 switch (c) {
2422 case 'G':
2423 case '`':
2424 if (vc->vc_par[0])
2425 vc->vc_par[0]--;
2426 gotoxy(vc, vc->vc_par[0], vc->state.y);
2427 break;
2428 case 'A':
2429 if (!vc->vc_par[0])
2430 vc->vc_par[0]++;
2431 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
2432 break;
2433 case 'B':
2434 case 'e':
2435 if (!vc->vc_par[0])
2436 vc->vc_par[0]++;
2437 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
2438 break;
2439 case 'C':
2440 case 'a':
2441 if (!vc->vc_par[0])
2442 vc->vc_par[0]++;
2443 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
2444 break;
2445 case 'D':
2446 if (!vc->vc_par[0])
2447 vc->vc_par[0]++;
2448 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
2449 break;
2450 case 'E':
2451 if (!vc->vc_par[0])
2452 vc->vc_par[0]++;
2453 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
2454 break;
2455 case 'F':
2456 if (!vc->vc_par[0])
2457 vc->vc_par[0]++;
2458 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
2459 break;
2460 case 'd':
2461 if (vc->vc_par[0])
2462 vc->vc_par[0]--;
2463 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
2464 break;
2465 case 'H':
2466 case 'f':
2467 if (vc->vc_par[0])
2468 vc->vc_par[0]--;
2469 if (vc->vc_par[1])
2470 vc->vc_par[1]--;
2471 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2472 break;
2473 case 'J':
2474 csi_J(vc, vc->vc_par[0]);
2475 break;
2476 case 'K':
2477 csi_K(vc);
2478 break;
2479 case 'L':
2480 csi_L(vc);
2481 break;
2482 case 'M':
2483 csi_M(vc);
2484 break;
2485 case 'P':
2486 csi_P(vc);
2487 break;
2488 case 'c':
2489 if (!vc->vc_par[0])
2490 respond_ID(tty);
2491 break;
2492 case 'g':
2493 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2494 set_bit(vc->state.x, vc->vc_tab_stop);
2495 else if (vc->vc_par[0] == 3)
2496 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2497 break;
2498 case 'h':
2499 csi_hl(vc, true);
2500 break;
2501 case 'l':
2502 csi_hl(vc, false);
2503 break;
2504 case 'm':
2505 csi_m(vc);
2506 break;
2507 case 'n':
2508 if (vc->vc_par[0] == 5)
2509 status_report(tty);
2510 else if (vc->vc_par[0] == 6)
2511 cursor_report(vc, tty);
2512 break;
2513 case 'q': /* DECLL - but only 3 leds */
2514 /* map 0,1,2,3 to 0,1,2,4 */
2515 if (vc->vc_par[0] < 4)
2516 vt_set_led_state(vc->vc_num,
2517 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2518 break;
2519 case 'r':
2520 if (!vc->vc_par[0])
2521 vc->vc_par[0]++;
2522 if (!vc->vc_par[1])
2523 vc->vc_par[1] = vc->vc_rows;
2524 /* Minimum allowed region is 2 lines */
2525 if (vc->vc_par[0] < vc->vc_par[1] &&
2526 vc->vc_par[1] <= vc->vc_rows) {
2527 vc->vc_top = vc->vc_par[0] - 1;
2528 vc->vc_bottom = vc->vc_par[1];
2529 gotoxay(vc, 0, 0);
2530 }
2531 break;
2532 case 's':
2533 save_cur(vc);
2534 break;
2535 case 'u':
2536 restore_cur(vc);
2537 break;
2538 case 'X':
2539 csi_X(vc);
2540 break;
2541 case '@':
2542 csi_at(vc, vc->vc_par[0]);
2543 break;
2544 case ']':
2545 csi_RSB(vc);
2546 break;
2547 }
2548
2549}
2550
2551static void vc_reset_params(struct vc_data *vc)
2552{
2553 memset(vc->vc_par, 0, sizeof(vc->vc_par));
2554 vc->vc_npar = 0;
2555}
2556
2557/* console_lock is held */
2558static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
2559{
2560 /*
2561 * Control characters can be used in the _middle_
2562 * of an escape sequence, aside from ANSI control strings.
2563 */
2564 if (ansi_control_string(vc->vc_state) && c >= ASCII_IGNORE_FIRST &&
2565 c <= ASCII_IGNORE_LAST)
2566 return;
2567
2568 if (handle_ascii(tty, vc, c))
2569 return;
2570
2571 switch(vc->vc_state) {
2572 case ESesc: /* ESC */
2573 handle_esc(tty, vc, c);
2574 return;
2575 case ESnonstd: /* ESC ] aka OSC */
2576 switch (c) {
2577 case 'P': /* palette escape sequence */
2578 vc_reset_params(vc);
2579 vc->vc_state = ESpalette;
2580 return;
2581 case 'R': /* reset palette */
2582 reset_palette(vc);
2583 break;
2584 case '0' ... '9':
2585 vc->vc_state = ESosc;
2586 return;
2587 }
2588 vc->vc_state = ESnormal;
2589 return;
2590 case ESpalette: /* ESC ] P aka OSC P */
2591 if (isxdigit(c)) {
2592 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2593 if (vc->vc_npar == 7) {
2594 int i = vc->vc_par[0] * 3, j = 1;
2595 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2596 vc->vc_palette[i++] += vc->vc_par[j++];
2597 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2598 vc->vc_palette[i++] += vc->vc_par[j++];
2599 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2600 vc->vc_palette[i] += vc->vc_par[j];
2601 set_palette(vc);
2602 vc->vc_state = ESnormal;
2603 }
2604 } else
2605 vc->vc_state = ESnormal;
2606 return;
2607 case ESsquare: /* ESC [ aka CSI, parameters or modifiers expected */
2608 vc_reset_params(vc);
2609
2610 vc->vc_state = ESgetpars;
2611 switch (c) {
2612 case '[': /* Function key */
2613 vc->vc_state = ESfunckey;
2614 return;
2615 case '?':
2616 vc->vc_priv = EPdec;
2617 return;
2618 case '>':
2619 vc->vc_priv = EPgt;
2620 return;
2621 case '=':
2622 vc->vc_priv = EPeq;
2623 return;
2624 case '<':
2625 vc->vc_priv = EPlt;
2626 return;
2627 }
2628 vc->vc_priv = EPecma;
2629 fallthrough;
2630 case ESgetpars: /* ESC [ aka CSI, parameters expected */
2631 switch (c) {
2632 case ';':
2633 if (vc->vc_npar < NPAR - 1) {
2634 vc->vc_npar++;
2635 return;
2636 }
2637 break;
2638 case '0' ... '9':
2639 vc->vc_par[vc->vc_npar] *= 10;
2640 vc->vc_par[vc->vc_npar] += c - '0';
2641 return;
2642 }
2643 if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST) {
2644 vc->vc_state = EScsiignore;
2645 return;
2646 }
2647
2648 /* parameters done, handle the control char @c */
2649
2650 vc->vc_state = ESnormal;
2651
2652 switch (vc->vc_priv) {
2653 case EPdec:
2654 csi_DEC(tty, vc, c);
2655 return;
2656 case EPecma:
2657 csi_ECMA(tty, vc, c);
2658 return;
2659 default:
2660 return;
2661 }
2662 case EScsiignore:
2663 if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST)
2664 return;
2665 vc->vc_state = ESnormal;
2666 return;
2667 case ESpercent: /* ESC % */
2668 vc->vc_state = ESnormal;
2669 switch (c) {
2670 case '@': /* defined in ISO 2022 */
2671 vc->vc_utf = 0;
2672 return;
2673 case 'G': /* prelim official escape code */
2674 case '8': /* retained for compatibility */
2675 vc->vc_utf = 1;
2676 return;
2677 }
2678 return;
2679 case ESfunckey: /* ESC [ [ aka CSI [ */
2680 vc->vc_state = ESnormal;
2681 return;
2682 case EShash: /* ESC # */
2683 vc->vc_state = ESnormal;
2684 if (c == '8') {
2685 /* DEC screen alignment test. kludge :-) */
2686 vc->vc_video_erase_char =
2687 (vc->vc_video_erase_char & 0xff00) | 'E';
2688 csi_J(vc, CSI_J_VISIBLE);
2689 vc->vc_video_erase_char =
2690 (vc->vc_video_erase_char & 0xff00) | ' ';
2691 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2692 }
2693 return;
2694 case ESsetG0: /* ESC ( */
2695 vc_setGx(vc, 0, c);
2696 vc->vc_state = ESnormal;
2697 return;
2698 case ESsetG1: /* ESC ) */
2699 vc_setGx(vc, 1, c);
2700 vc->vc_state = ESnormal;
2701 return;
2702 case ESapc: /* ESC _ */
2703 return;
2704 case ESosc: /* ESC ] [0-9] aka OSC [0-9] */
2705 return;
2706 case ESpm: /* ESC ^ */
2707 return;
2708 case ESdcs: /* ESC P */
2709 return;
2710 default:
2711 vc->vc_state = ESnormal;
2712 }
2713}
2714
2715/* is_double_width() is based on the wcwidth() implementation by
2716 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2717 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2718 */
2719struct interval {
2720 uint32_t first;
2721 uint32_t last;
2722};
2723
2724static int ucs_cmp(const void *key, const void *elt)
2725{
2726 uint32_t ucs = *(uint32_t *)key;
2727 struct interval e = *(struct interval *) elt;
2728
2729 if (ucs > e.last)
2730 return 1;
2731 else if (ucs < e.first)
2732 return -1;
2733 return 0;
2734}
2735
2736static int is_double_width(uint32_t ucs)
2737{
2738 static const struct interval double_width[] = {
2739 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2740 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2741 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2742 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2743 };
2744 if (ucs < double_width[0].first ||
2745 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2746 return 0;
2747
2748 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2749 sizeof(struct interval), ucs_cmp) != NULL;
2750}
2751
2752struct vc_draw_region {
2753 unsigned long from, to;
2754 int x;
2755};
2756
2757static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2758{
2759 if (draw->x < 0)
2760 return;
2761
2762 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2763 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2764 draw->x);
2765 draw->x = -1;
2766}
2767
2768static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2769{
2770 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2771 if (vc->vc_toggle_meta)
2772 c |= 0x80;
2773
2774 return vc->vc_translate[c];
2775 }
2776
2777 return c;
2778}
2779
2780
2781/**
2782 * vc_sanitize_unicode - Replace invalid Unicode code points with ``U+FFFD``
2783 * @c: the received code point
2784 */
2785static inline int vc_sanitize_unicode(const int c)
2786{
2787 if (c >= 0xd800 && c <= 0xdfff)
2788 return 0xfffd;
2789
2790 return c;
2791}
2792
2793/**
2794 * vc_translate_unicode - Combine UTF-8 into Unicode in &vc_data.vc_utf_char
2795 * @vc: virtual console
2796 * @c: UTF-8 byte to translate
2797 * @rescan: set to true iff @c wasn't consumed here and needs to be re-processed
2798 *
2799 * * &vc_data.vc_utf_char is the being-constructed Unicode code point.
2800 * * &vc_data.vc_utf_count is the number of continuation bytes still expected to
2801 * arrive.
2802 * * &vc_data.vc_npar is the number of continuation bytes arrived so far.
2803 *
2804 * Return:
2805 * * %-1 - Input OK so far, @c consumed, further bytes expected.
2806 * * %0xFFFD - Possibility 1: input invalid, @c may have been consumed (see
2807 * desc. of @rescan). Possibility 2: input OK, @c consumed,
2808 * ``U+FFFD`` is the resulting code point. ``U+FFFD`` is valid,
2809 * ``REPLACEMENT CHARACTER``.
2810 * * otherwise - Input OK, @c consumed, resulting code point returned.
2811 */
2812static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2813{
2814 static const u32 utf8_length_changes[] = {0x7f, 0x7ff, 0xffff, 0x10ffff};
2815
2816 /* Continuation byte received */
2817 if ((c & 0xc0) == 0x80) {
2818 /* Unexpected continuation byte? */
2819 if (!vc->vc_utf_count)
2820 return 0xfffd;
2821
2822 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2823 vc->vc_npar++;
2824 if (--vc->vc_utf_count)
2825 goto need_more_bytes;
2826
2827 /* Got a whole character */
2828 c = vc->vc_utf_char;
2829 /* Reject overlong sequences */
2830 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2831 c > utf8_length_changes[vc->vc_npar])
2832 return 0xfffd;
2833
2834 return vc_sanitize_unicode(c);
2835 }
2836
2837 /* Single ASCII byte or first byte of a sequence received */
2838 if (vc->vc_utf_count) {
2839 /* Continuation byte expected */
2840 *rescan = true;
2841 vc->vc_utf_count = 0;
2842 return 0xfffd;
2843 }
2844
2845 /* Nothing to do if an ASCII byte was received */
2846 if (c <= 0x7f)
2847 return c;
2848
2849 /* First byte of a multibyte sequence received */
2850 vc->vc_npar = 0;
2851 if ((c & 0xe0) == 0xc0) {
2852 vc->vc_utf_count = 1;
2853 vc->vc_utf_char = (c & 0x1f);
2854 } else if ((c & 0xf0) == 0xe0) {
2855 vc->vc_utf_count = 2;
2856 vc->vc_utf_char = (c & 0x0f);
2857 } else if ((c & 0xf8) == 0xf0) {
2858 vc->vc_utf_count = 3;
2859 vc->vc_utf_char = (c & 0x07);
2860 } else {
2861 return 0xfffd;
2862 }
2863
2864need_more_bytes:
2865 return -1;
2866}
2867
2868static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2869{
2870 /* Do no translation at all in control states */
2871 if (vc->vc_state != ESnormal)
2872 return *c;
2873
2874 if (vc->vc_utf && !vc->vc_disp_ctrl)
2875 return *c = vc_translate_unicode(vc, *c, rescan);
2876
2877 /* no utf or alternate charset mode */
2878 return vc_translate_ascii(vc, *c);
2879}
2880
2881static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2882{
2883 if (!vc->vc_can_do_color)
2884 return vc->vc_attr ^ 0x08;
2885
2886 if (vc->vc_hi_font_mask == 0x100)
2887 return (vc->vc_attr & 0x11) |
2888 ((vc->vc_attr & 0xe0) >> 4) |
2889 ((vc->vc_attr & 0x0e) << 4);
2890
2891 return (vc->vc_attr & 0x88) |
2892 ((vc->vc_attr & 0x70) >> 4) |
2893 ((vc->vc_attr & 0x07) << 4);
2894}
2895
2896static bool vc_is_control(struct vc_data *vc, int tc, int c)
2897{
2898 /*
2899 * A bitmap for codes <32. A bit of 1 indicates that the code
2900 * corresponding to that bit number invokes some special action (such
2901 * as cursor movement) and should not be displayed as a glyph unless
2902 * the disp_ctrl mode is explicitly enabled.
2903 */
2904 static const u32 CTRL_ACTION = BIT(ASCII_NULL) |
2905 GENMASK(ASCII_SHIFTIN, ASCII_BELL) | BIT(ASCII_CANCEL) |
2906 BIT(ASCII_SUBSTITUTE) | BIT(ASCII_ESCAPE);
2907 /* Cannot be overridden by disp_ctrl */
2908 static const u32 CTRL_ALWAYS = BIT(ASCII_NULL) | BIT(ASCII_BACKSPACE) |
2909 BIT(ASCII_LINEFEED) | BIT(ASCII_SHIFTIN) | BIT(ASCII_SHIFTOUT) |
2910 BIT(ASCII_CAR_RET) | BIT(ASCII_FORMFEED) | BIT(ASCII_ESCAPE);
2911
2912 if (vc->vc_state != ESnormal)
2913 return true;
2914
2915 if (!tc)
2916 return true;
2917
2918 /*
2919 * If the original code was a control character we only allow a glyph
2920 * to be displayed if the code is not normally used (such as for cursor
2921 * movement) or if the disp_ctrl mode has been explicitly enabled.
2922 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2923 * displayed as control characters, as the console would be pretty
2924 * useless without them; to display an arbitrary font position use the
2925 * direct-to-font zone in UTF-8 mode.
2926 */
2927 if (c < BITS_PER_TYPE(CTRL_ALWAYS)) {
2928 if (vc->vc_disp_ctrl)
2929 return CTRL_ALWAYS & BIT(c);
2930 else
2931 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2932 }
2933
2934 if (c == ASCII_DEL && !vc->vc_disp_ctrl)
2935 return true;
2936
2937 if (c == ASCII_EXT_CSI)
2938 return true;
2939
2940 return false;
2941}
2942
2943static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2944 struct vc_draw_region *draw)
2945{
2946 int next_c;
2947 unsigned char vc_attr = vc->vc_attr;
2948 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2949 u8 width = 1;
2950 bool inverse = false;
2951
2952 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2953 if (is_double_width(c))
2954 width = 2;
2955 }
2956
2957 /* Now try to find out how to display it */
2958 tc = conv_uni_to_pc(vc, tc);
2959 if (tc & ~charmask) {
2960 if (tc == -1 || tc == -2)
2961 return -1; /* nothing to display */
2962
2963 /* Glyph not found */
2964 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
2965 !(c & ~charmask)) {
2966 /*
2967 * In legacy mode use the glyph we get by a 1:1
2968 * mapping.
2969 * This would make absolutely no sense with Unicode in
2970 * mind, but do this for ASCII characters since a font
2971 * may lack Unicode mapping info and we don't want to
2972 * end up with having question marks only.
2973 */
2974 tc = c;
2975 } else {
2976 /*
2977 * Display U+FFFD. If it's not found, display an inverse
2978 * question mark.
2979 */
2980 tc = conv_uni_to_pc(vc, 0xfffd);
2981 if (tc < 0) {
2982 inverse = true;
2983 tc = conv_uni_to_pc(vc, '?');
2984 if (tc < 0)
2985 tc = '?';
2986
2987 vc_attr = vc_invert_attr(vc);
2988 con_flush(vc, draw);
2989 }
2990 }
2991 }
2992
2993 next_c = c;
2994 while (1) {
2995 if (vc->vc_need_wrap || vc->vc_decim)
2996 con_flush(vc, draw);
2997 if (vc->vc_need_wrap) {
2998 cr(vc);
2999 lf(vc);
3000 }
3001 if (vc->vc_decim)
3002 insert_char(vc, 1);
3003 vc_uniscr_putc(vc, next_c);
3004
3005 if (himask)
3006 tc = ((tc & 0x100) ? himask : 0) |
3007 (tc & 0xff);
3008 tc |= (vc_attr << 8) & ~himask;
3009
3010 scr_writew(tc, (u16 *)vc->vc_pos);
3011
3012 if (con_should_update(vc) && draw->x < 0) {
3013 draw->x = vc->state.x;
3014 draw->from = vc->vc_pos;
3015 }
3016 if (vc->state.x == vc->vc_cols - 1) {
3017 vc->vc_need_wrap = vc->vc_decawm;
3018 draw->to = vc->vc_pos + 2;
3019 } else {
3020 vc->state.x++;
3021 draw->to = (vc->vc_pos += 2);
3022 }
3023
3024 if (!--width)
3025 break;
3026
3027 /* A space is printed in the second column */
3028 tc = conv_uni_to_pc(vc, ' ');
3029 if (tc < 0)
3030 tc = ' ';
3031 next_c = ' ';
3032 }
3033 notify_write(vc, c);
3034
3035 if (inverse)
3036 con_flush(vc, draw);
3037
3038 return 0;
3039}
3040
3041/* acquires console_lock */
3042static int do_con_write(struct tty_struct *tty, const u8 *buf, int count)
3043{
3044 struct vc_draw_region draw = {
3045 .x = -1,
3046 };
3047 int c, tc, n = 0;
3048 unsigned int currcons;
3049 struct vc_data *vc = tty->driver_data;
3050 struct vt_notifier_param param;
3051 bool rescan;
3052
3053 if (in_interrupt())
3054 return count;
3055
3056 console_lock();
3057 currcons = vc->vc_num;
3058 if (!vc_cons_allocated(currcons)) {
3059 /* could this happen? */
3060 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
3061 console_unlock();
3062 return 0;
3063 }
3064
3065
3066 /* undraw cursor first */
3067 if (con_is_fg(vc))
3068 hide_cursor(vc);
3069
3070 param.vc = vc;
3071
3072 while (!tty->flow.stopped && count) {
3073 u8 orig = *buf;
3074 buf++;
3075 n++;
3076 count--;
3077rescan_last_byte:
3078 c = orig;
3079 rescan = false;
3080
3081 tc = vc_translate(vc, &c, &rescan);
3082 if (tc == -1)
3083 continue;
3084
3085 param.c = tc;
3086 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
3087 ¶m) == NOTIFY_STOP)
3088 continue;
3089
3090 if (vc_is_control(vc, tc, c)) {
3091 con_flush(vc, &draw);
3092 do_con_trol(tty, vc, orig);
3093 continue;
3094 }
3095
3096 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
3097 continue;
3098
3099 if (rescan)
3100 goto rescan_last_byte;
3101 }
3102 con_flush(vc, &draw);
3103 console_conditional_schedule();
3104 notify_update(vc);
3105 console_unlock();
3106 return n;
3107}
3108
3109/*
3110 * This is the console switching callback.
3111 *
3112 * Doing console switching in a process context allows
3113 * us to do the switches asynchronously (needed when we want
3114 * to switch due to a keyboard interrupt). Synchronization
3115 * with other console code and prevention of re-entrancy is
3116 * ensured with console_lock.
3117 */
3118static void console_callback(struct work_struct *ignored)
3119{
3120 console_lock();
3121
3122 if (want_console >= 0) {
3123 if (want_console != fg_console &&
3124 vc_cons_allocated(want_console)) {
3125 hide_cursor(vc_cons[fg_console].d);
3126 change_console(vc_cons[want_console].d);
3127 /* we only changed when the console had already
3128 been allocated - a new console is not created
3129 in an interrupt routine */
3130 }
3131 want_console = -1;
3132 }
3133 if (do_poke_blanked_console) { /* do not unblank for a LED change */
3134 do_poke_blanked_console = 0;
3135 poke_blanked_console();
3136 }
3137 if (scrollback_delta) {
3138 struct vc_data *vc = vc_cons[fg_console].d;
3139 clear_selection();
3140 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
3141 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
3142 scrollback_delta = 0;
3143 }
3144 if (blank_timer_expired) {
3145 do_blank_screen(0);
3146 blank_timer_expired = 0;
3147 }
3148 notify_update(vc_cons[fg_console].d);
3149
3150 console_unlock();
3151}
3152
3153int set_console(int nr)
3154{
3155 struct vc_data *vc = vc_cons[fg_console].d;
3156
3157 if (!vc_cons_allocated(nr) || vt_dont_switch ||
3158 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
3159
3160 /*
3161 * Console switch will fail in console_callback() or
3162 * change_console() so there is no point scheduling
3163 * the callback
3164 *
3165 * Existing set_console() users don't check the return
3166 * value so this shouldn't break anything
3167 */
3168 return -EINVAL;
3169 }
3170
3171 want_console = nr;
3172 schedule_console_callback();
3173
3174 return 0;
3175}
3176
3177struct tty_driver *console_driver;
3178
3179#ifdef CONFIG_VT_CONSOLE
3180
3181/**
3182 * vt_kmsg_redirect() - sets/gets the kernel message console
3183 * @new: the new virtual terminal number or -1 if the console should stay
3184 * unchanged
3185 *
3186 * By default, the kernel messages are always printed on the current virtual
3187 * console. However, the user may modify that default with the
3188 * %TIOCL_SETKMSGREDIRECT ioctl call.
3189 *
3190 * This function sets the kernel message console to be @new. It returns the old
3191 * virtual console number. The virtual terminal number %0 (both as parameter and
3192 * return value) means no redirection (i.e. always printed on the currently
3193 * active console).
3194 *
3195 * The parameter -1 means that only the current console is returned, but the
3196 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3197 * case to make the code more understandable.
3198 *
3199 * When the kernel is compiled without %CONFIG_VT_CONSOLE, this function ignores
3200 * the parameter and always returns %0.
3201 */
3202int vt_kmsg_redirect(int new)
3203{
3204 static int kmsg_con;
3205
3206 if (new != -1)
3207 return xchg(&kmsg_con, new);
3208 else
3209 return kmsg_con;
3210}
3211
3212/*
3213 * Console on virtual terminal
3214 *
3215 * The console must be locked when we get here.
3216 */
3217
3218static void vt_console_print(struct console *co, const char *b, unsigned count)
3219{
3220 struct vc_data *vc = vc_cons[fg_console].d;
3221 unsigned char c;
3222 static DEFINE_SPINLOCK(printing_lock);
3223 const ushort *start;
3224 ushort start_x, cnt;
3225 int kmsg_console;
3226
3227 WARN_CONSOLE_UNLOCKED();
3228
3229 /* this protects against concurrent oops only */
3230 if (!spin_trylock(&printing_lock))
3231 return;
3232
3233 kmsg_console = vt_get_kmsg_redirect();
3234 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3235 vc = vc_cons[kmsg_console - 1].d;
3236
3237 if (!vc_cons_allocated(fg_console)) {
3238 /* impossible */
3239 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3240 goto quit;
3241 }
3242
3243 if (vc->vc_mode != KD_TEXT)
3244 goto quit;
3245
3246 /* undraw cursor first */
3247 if (con_is_fg(vc))
3248 hide_cursor(vc);
3249
3250 start = (ushort *)vc->vc_pos;
3251 start_x = vc->state.x;
3252 cnt = 0;
3253 while (count--) {
3254 c = *b++;
3255 if (c == ASCII_LINEFEED || c == ASCII_CAR_RET ||
3256 c == ASCII_BACKSPACE || vc->vc_need_wrap) {
3257 if (cnt && con_is_visible(vc))
3258 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3259 cnt = 0;
3260 if (c == ASCII_BACKSPACE) {
3261 bs(vc);
3262 start = (ushort *)vc->vc_pos;
3263 start_x = vc->state.x;
3264 continue;
3265 }
3266 if (c != ASCII_CAR_RET)
3267 lf(vc);
3268 cr(vc);
3269 start = (ushort *)vc->vc_pos;
3270 start_x = vc->state.x;
3271 if (c == ASCII_LINEFEED || c == ASCII_CAR_RET)
3272 continue;
3273 }
3274 vc_uniscr_putc(vc, c);
3275 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3276 notify_write(vc, c);
3277 cnt++;
3278 if (vc->state.x == vc->vc_cols - 1) {
3279 vc->vc_need_wrap = 1;
3280 } else {
3281 vc->vc_pos += 2;
3282 vc->state.x++;
3283 }
3284 }
3285 if (cnt && con_is_visible(vc))
3286 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3287 set_cursor(vc);
3288 notify_update(vc);
3289
3290quit:
3291 spin_unlock(&printing_lock);
3292}
3293
3294static struct tty_driver *vt_console_device(struct console *c, int *index)
3295{
3296 *index = c->index ? c->index-1 : fg_console;
3297 return console_driver;
3298}
3299
3300static int vt_console_setup(struct console *co, char *options)
3301{
3302 return co->index >= MAX_NR_CONSOLES ? -EINVAL : 0;
3303}
3304
3305static struct console vt_console_driver = {
3306 .name = "tty",
3307 .setup = vt_console_setup,
3308 .write = vt_console_print,
3309 .device = vt_console_device,
3310 .unblank = unblank_screen,
3311 .flags = CON_PRINTBUFFER,
3312 .index = -1,
3313};
3314#endif
3315
3316/*
3317 * Handling of Linux-specific VC ioctls
3318 */
3319
3320/*
3321 * Generally a bit racy with respect to console_lock();.
3322 *
3323 * There are some functions which don't need it.
3324 *
3325 * There are some functions which can sleep for arbitrary periods
3326 * (paste_selection) but we don't need the lock there anyway.
3327 *
3328 * set_selection_user has locking, and definitely needs it
3329 */
3330
3331int tioclinux(struct tty_struct *tty, unsigned long arg)
3332{
3333 char type, data;
3334 char __user *p = (char __user *)arg;
3335 void __user *param_aligned32 = (u32 __user *)arg + 1;
3336 void __user *param = (void __user *)arg + 1;
3337 int lines;
3338 int ret;
3339
3340 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3341 return -EPERM;
3342 if (get_user(type, p))
3343 return -EFAULT;
3344 ret = 0;
3345
3346 switch (type) {
3347 case TIOCL_SETSEL:
3348 return set_selection_user(param, tty);
3349 case TIOCL_PASTESEL:
3350 if (!capable(CAP_SYS_ADMIN))
3351 return -EPERM;
3352 return paste_selection(tty);
3353 case TIOCL_UNBLANKSCREEN:
3354 console_lock();
3355 unblank_screen();
3356 console_unlock();
3357 break;
3358 case TIOCL_SELLOADLUT:
3359 if (!capable(CAP_SYS_ADMIN))
3360 return -EPERM;
3361 return sel_loadlut(param_aligned32);
3362 case TIOCL_GETSHIFTSTATE:
3363 /*
3364 * Make it possible to react to Shift+Mousebutton. Note that
3365 * 'shift_state' is an undocumented kernel-internal variable;
3366 * programs not closely related to the kernel should not use
3367 * this.
3368 */
3369 data = vt_get_shift_state();
3370 return put_user(data, p);
3371 case TIOCL_GETMOUSEREPORTING:
3372 console_lock(); /* May be overkill */
3373 data = mouse_reporting();
3374 console_unlock();
3375 return put_user(data, p);
3376 case TIOCL_SETVESABLANK:
3377 return set_vesa_blanking(param);
3378 case TIOCL_GETKMSGREDIRECT:
3379 data = vt_get_kmsg_redirect();
3380 return put_user(data, p);
3381 case TIOCL_SETKMSGREDIRECT:
3382 if (!capable(CAP_SYS_ADMIN))
3383 return -EPERM;
3384
3385 if (get_user(data, p+1))
3386 return -EFAULT;
3387
3388 vt_kmsg_redirect(data);
3389
3390 break;
3391 case TIOCL_GETFGCONSOLE:
3392 /*
3393 * No locking needed as this is a transiently correct return
3394 * anyway if the caller hasn't disabled switching.
3395 */
3396 return fg_console;
3397 case TIOCL_SCROLLCONSOLE:
3398 if (get_user(lines, (s32 __user *)param_aligned32))
3399 return -EFAULT;
3400
3401 /*
3402 * Needs the console lock here. Note that lots of other calls
3403 * need fixing before the lock is actually useful!
3404 */
3405 console_lock();
3406 scrollfront(vc_cons[fg_console].d, lines);
3407 console_unlock();
3408 break;
3409 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3410 console_lock();
3411 ignore_poke = 1;
3412 do_blank_screen(0);
3413 console_unlock();
3414 break;
3415 case TIOCL_BLANKEDSCREEN:
3416 return console_blanked;
3417 default:
3418 return -EINVAL;
3419 }
3420
3421 return ret;
3422}
3423
3424/*
3425 * /dev/ttyN handling
3426 */
3427
3428static ssize_t con_write(struct tty_struct *tty, const u8 *buf, size_t count)
3429{
3430 int retval;
3431
3432 retval = do_con_write(tty, buf, count);
3433 con_flush_chars(tty);
3434
3435 return retval;
3436}
3437
3438static int con_put_char(struct tty_struct *tty, u8 ch)
3439{
3440 return do_con_write(tty, &ch, 1);
3441}
3442
3443static unsigned int con_write_room(struct tty_struct *tty)
3444{
3445 if (tty->flow.stopped)
3446 return 0;
3447 return 32768; /* No limit, really; we're not buffering */
3448}
3449
3450/*
3451 * con_throttle and con_unthrottle are only used for
3452 * paste_selection(), which has to stuff in a large number of
3453 * characters...
3454 */
3455static void con_throttle(struct tty_struct *tty)
3456{
3457}
3458
3459static void con_unthrottle(struct tty_struct *tty)
3460{
3461 struct vc_data *vc = tty->driver_data;
3462
3463 wake_up_interruptible(&vc->paste_wait);
3464}
3465
3466/*
3467 * Turn the Scroll-Lock LED on when the tty is stopped
3468 */
3469static void con_stop(struct tty_struct *tty)
3470{
3471 int console_num;
3472 if (!tty)
3473 return;
3474 console_num = tty->index;
3475 if (!vc_cons_allocated(console_num))
3476 return;
3477 vt_kbd_con_stop(console_num);
3478}
3479
3480/*
3481 * Turn the Scroll-Lock LED off when the console is started
3482 */
3483static void con_start(struct tty_struct *tty)
3484{
3485 int console_num;
3486 if (!tty)
3487 return;
3488 console_num = tty->index;
3489 if (!vc_cons_allocated(console_num))
3490 return;
3491 vt_kbd_con_start(console_num);
3492}
3493
3494static void con_flush_chars(struct tty_struct *tty)
3495{
3496 struct vc_data *vc = tty->driver_data;
3497
3498 if (in_interrupt()) /* from flush_to_ldisc */
3499 return;
3500
3501 console_lock();
3502 set_cursor(vc);
3503 console_unlock();
3504}
3505
3506/*
3507 * Allocate the console screen memory.
3508 */
3509static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3510{
3511 unsigned int currcons = tty->index;
3512 struct vc_data *vc;
3513 int ret;
3514
3515 console_lock();
3516 ret = vc_allocate(currcons);
3517 if (ret)
3518 goto unlock;
3519
3520 vc = vc_cons[currcons].d;
3521
3522 /* Still being freed */
3523 if (vc->port.tty) {
3524 ret = -ERESTARTSYS;
3525 goto unlock;
3526 }
3527
3528 ret = tty_port_install(&vc->port, driver, tty);
3529 if (ret)
3530 goto unlock;
3531
3532 tty->driver_data = vc;
3533 vc->port.tty = tty;
3534 tty_port_get(&vc->port);
3535
3536 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3537 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3538 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3539 }
3540 if (vc->vc_utf)
3541 tty->termios.c_iflag |= IUTF8;
3542 else
3543 tty->termios.c_iflag &= ~IUTF8;
3544unlock:
3545 console_unlock();
3546 return ret;
3547}
3548
3549static int con_open(struct tty_struct *tty, struct file *filp)
3550{
3551 /* everything done in install */
3552 return 0;
3553}
3554
3555
3556static void con_close(struct tty_struct *tty, struct file *filp)
3557{
3558 /* Nothing to do - we defer to shutdown */
3559}
3560
3561static void con_shutdown(struct tty_struct *tty)
3562{
3563 struct vc_data *vc = tty->driver_data;
3564 BUG_ON(vc == NULL);
3565 console_lock();
3566 vc->port.tty = NULL;
3567 console_unlock();
3568}
3569
3570static void con_cleanup(struct tty_struct *tty)
3571{
3572 struct vc_data *vc = tty->driver_data;
3573
3574 tty_port_put(&vc->port);
3575}
3576
3577/*
3578 * We can't deal with anything but the N_TTY ldisc,
3579 * because we can sleep in our write() routine.
3580 */
3581static int con_ldisc_ok(struct tty_struct *tty, int ldisc)
3582{
3583 return ldisc == N_TTY ? 0 : -EINVAL;
3584}
3585
3586static int default_color = 7; /* white */
3587static int default_italic_color = 2; // green (ASCII)
3588static int default_underline_color = 3; // cyan (ASCII)
3589module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3590module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3591module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3592
3593static void vc_init(struct vc_data *vc, int do_clear)
3594{
3595 int j, k ;
3596
3597 set_origin(vc);
3598 vc->vc_pos = vc->vc_origin;
3599 reset_vc(vc);
3600 for (j=k=0; j<16; j++) {
3601 vc->vc_palette[k++] = default_red[j] ;
3602 vc->vc_palette[k++] = default_grn[j] ;
3603 vc->vc_palette[k++] = default_blu[j] ;
3604 }
3605 vc->vc_def_color = default_color;
3606 vc->vc_ulcolor = default_underline_color;
3607 vc->vc_itcolor = default_italic_color;
3608 vc->vc_halfcolor = 0x08; /* grey */
3609 init_waitqueue_head(&vc->paste_wait);
3610 reset_terminal(vc, do_clear);
3611}
3612
3613/*
3614 * This routine initializes console interrupts, and does nothing
3615 * else. If you want the screen to clear, call tty_write with
3616 * the appropriate escape-sequence.
3617 */
3618
3619static int __init con_init(void)
3620{
3621 const char *display_desc = NULL;
3622 struct vc_data *vc;
3623 unsigned int currcons = 0, i;
3624
3625 console_lock();
3626
3627 if (!conswitchp)
3628 conswitchp = &dummy_con;
3629 display_desc = conswitchp->con_startup();
3630 if (!display_desc) {
3631 fg_console = 0;
3632 console_unlock();
3633 return 0;
3634 }
3635
3636 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3637 struct con_driver *con_driver = ®istered_con_driver[i];
3638
3639 if (con_driver->con == NULL) {
3640 con_driver->con = conswitchp;
3641 con_driver->desc = display_desc;
3642 con_driver->flag = CON_DRIVER_FLAG_INIT;
3643 con_driver->first = 0;
3644 con_driver->last = MAX_NR_CONSOLES - 1;
3645 break;
3646 }
3647 }
3648
3649 for (i = 0; i < MAX_NR_CONSOLES; i++)
3650 con_driver_map[i] = conswitchp;
3651
3652 if (blankinterval) {
3653 blank_state = blank_normal_wait;
3654 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3655 }
3656
3657 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3658 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3659 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3660 tty_port_init(&vc->port);
3661 visual_init(vc, currcons, true);
3662 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3663 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3664 vc_init(vc, currcons || !vc->vc_sw->con_save_screen);
3665 }
3666 currcons = fg_console = 0;
3667 master_display_fg = vc = vc_cons[currcons].d;
3668 set_origin(vc);
3669 save_screen(vc);
3670 gotoxy(vc, vc->state.x, vc->state.y);
3671 csi_J(vc, CSI_J_CURSOR_TO_END);
3672 update_screen(vc);
3673 pr_info("Console: %s %s %dx%d\n",
3674 vc->vc_can_do_color ? "colour" : "mono",
3675 display_desc, vc->vc_cols, vc->vc_rows);
3676
3677 console_unlock();
3678
3679#ifdef CONFIG_VT_CONSOLE
3680 register_console(&vt_console_driver);
3681#endif
3682 return 0;
3683}
3684console_initcall(con_init);
3685
3686static const struct tty_operations con_ops = {
3687 .install = con_install,
3688 .open = con_open,
3689 .close = con_close,
3690 .write = con_write,
3691 .write_room = con_write_room,
3692 .put_char = con_put_char,
3693 .flush_chars = con_flush_chars,
3694 .ioctl = vt_ioctl,
3695#ifdef CONFIG_COMPAT
3696 .compat_ioctl = vt_compat_ioctl,
3697#endif
3698 .stop = con_stop,
3699 .start = con_start,
3700 .throttle = con_throttle,
3701 .unthrottle = con_unthrottle,
3702 .resize = vt_resize,
3703 .shutdown = con_shutdown,
3704 .cleanup = con_cleanup,
3705 .ldisc_ok = con_ldisc_ok,
3706};
3707
3708static struct cdev vc0_cdev;
3709
3710static ssize_t show_tty_active(struct device *dev,
3711 struct device_attribute *attr, char *buf)
3712{
3713 return sprintf(buf, "tty%d\n", fg_console + 1);
3714}
3715static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3716
3717static struct attribute *vt_dev_attrs[] = {
3718 &dev_attr_active.attr,
3719 NULL
3720};
3721
3722ATTRIBUTE_GROUPS(vt_dev);
3723
3724int __init vty_init(const struct file_operations *console_fops)
3725{
3726 cdev_init(&vc0_cdev, console_fops);
3727 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3728 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3729 panic("Couldn't register /dev/tty0 driver\n");
3730 tty0dev = device_create_with_groups(&tty_class, NULL,
3731 MKDEV(TTY_MAJOR, 0), NULL,
3732 vt_dev_groups, "tty0");
3733 if (IS_ERR(tty0dev))
3734 tty0dev = NULL;
3735
3736 vcs_init();
3737
3738 console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3739 TTY_DRIVER_RESET_TERMIOS);
3740 if (IS_ERR(console_driver))
3741 panic("Couldn't allocate console driver\n");
3742
3743 console_driver->name = "tty";
3744 console_driver->name_base = 1;
3745 console_driver->major = TTY_MAJOR;
3746 console_driver->minor_start = 1;
3747 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3748 console_driver->init_termios = tty_std_termios;
3749 if (default_utf8)
3750 console_driver->init_termios.c_iflag |= IUTF8;
3751 tty_set_operations(console_driver, &con_ops);
3752 if (tty_register_driver(console_driver))
3753 panic("Couldn't register console driver\n");
3754 kbd_init();
3755 console_map_init();
3756#ifdef CONFIG_MDA_CONSOLE
3757 mda_console_init();
3758#endif
3759 return 0;
3760}
3761
3762static const struct class vtconsole_class = {
3763 .name = "vtconsole",
3764};
3765
3766static int do_bind_con_driver(const struct consw *csw, int first, int last,
3767 int deflt)
3768{
3769 struct module *owner = csw->owner;
3770 const char *desc = NULL;
3771 struct con_driver *con_driver;
3772 int i, j = -1, k = -1, retval = -ENODEV;
3773
3774 if (!try_module_get(owner))
3775 return -ENODEV;
3776
3777 WARN_CONSOLE_UNLOCKED();
3778
3779 /* check if driver is registered */
3780 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3781 con_driver = ®istered_con_driver[i];
3782
3783 if (con_driver->con == csw) {
3784 desc = con_driver->desc;
3785 retval = 0;
3786 break;
3787 }
3788 }
3789
3790 if (retval)
3791 goto err;
3792
3793 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3794 csw->con_startup();
3795 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3796 }
3797
3798 if (deflt) {
3799 if (conswitchp)
3800 module_put(conswitchp->owner);
3801
3802 __module_get(owner);
3803 conswitchp = csw;
3804 }
3805
3806 first = max(first, con_driver->first);
3807 last = min(last, con_driver->last);
3808
3809 for (i = first; i <= last; i++) {
3810 int old_was_color;
3811 struct vc_data *vc = vc_cons[i].d;
3812
3813 if (con_driver_map[i])
3814 module_put(con_driver_map[i]->owner);
3815 __module_get(owner);
3816 con_driver_map[i] = csw;
3817
3818 if (!vc || !vc->vc_sw)
3819 continue;
3820
3821 j = i;
3822
3823 if (con_is_visible(vc)) {
3824 k = i;
3825 save_screen(vc);
3826 }
3827
3828 old_was_color = vc->vc_can_do_color;
3829 vc->vc_sw->con_deinit(vc);
3830 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3831 visual_init(vc, i, false);
3832 set_origin(vc);
3833 update_attr(vc);
3834
3835 /* If the console changed between mono <-> color, then
3836 * the attributes in the screenbuf will be wrong. The
3837 * following resets all attributes to something sane.
3838 */
3839 if (old_was_color != vc->vc_can_do_color)
3840 clear_buffer_attributes(vc);
3841 }
3842
3843 pr_info("Console: switching ");
3844 if (!deflt)
3845 pr_cont("consoles %d-%d ", first + 1, last + 1);
3846 if (j >= 0) {
3847 struct vc_data *vc = vc_cons[j].d;
3848
3849 pr_cont("to %s %s %dx%d\n",
3850 vc->vc_can_do_color ? "colour" : "mono",
3851 desc, vc->vc_cols, vc->vc_rows);
3852
3853 if (k >= 0) {
3854 vc = vc_cons[k].d;
3855 update_screen(vc);
3856 }
3857 } else {
3858 pr_cont("to %s\n", desc);
3859 }
3860
3861 retval = 0;
3862err:
3863 module_put(owner);
3864 return retval;
3865};
3866
3867
3868#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3869int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3870{
3871 struct module *owner = csw->owner;
3872 const struct consw *defcsw = NULL;
3873 struct con_driver *con_driver = NULL, *con_back = NULL;
3874 int i, retval = -ENODEV;
3875
3876 if (!try_module_get(owner))
3877 return -ENODEV;
3878
3879 WARN_CONSOLE_UNLOCKED();
3880
3881 /* check if driver is registered and if it is unbindable */
3882 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3883 con_driver = ®istered_con_driver[i];
3884
3885 if (con_driver->con == csw &&
3886 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3887 retval = 0;
3888 break;
3889 }
3890 }
3891
3892 if (retval)
3893 goto err;
3894
3895 retval = -ENODEV;
3896
3897 /* check if backup driver exists */
3898 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3899 con_back = ®istered_con_driver[i];
3900
3901 if (con_back->con && con_back->con != csw) {
3902 defcsw = con_back->con;
3903 retval = 0;
3904 break;
3905 }
3906 }
3907
3908 if (retval)
3909 goto err;
3910
3911 if (!con_is_bound(csw))
3912 goto err;
3913
3914 first = max(first, con_driver->first);
3915 last = min(last, con_driver->last);
3916
3917 for (i = first; i <= last; i++) {
3918 if (con_driver_map[i] == csw) {
3919 module_put(csw->owner);
3920 con_driver_map[i] = NULL;
3921 }
3922 }
3923
3924 if (!con_is_bound(defcsw)) {
3925 const struct consw *defconsw = conswitchp;
3926
3927 defcsw->con_startup();
3928 con_back->flag |= CON_DRIVER_FLAG_INIT;
3929 /*
3930 * vgacon may change the default driver to point
3931 * to dummycon, we restore it here...
3932 */
3933 conswitchp = defconsw;
3934 }
3935
3936 if (!con_is_bound(csw))
3937 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3938
3939 /* ignore return value, binding should not fail */
3940 do_bind_con_driver(defcsw, first, last, deflt);
3941err:
3942 module_put(owner);
3943 return retval;
3944
3945}
3946EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3947
3948static int vt_bind(struct con_driver *con)
3949{
3950 const struct consw *defcsw = NULL, *csw = NULL;
3951 int i, more = 1, first = -1, last = -1, deflt = 0;
3952
3953 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3954 goto err;
3955
3956 csw = con->con;
3957
3958 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3959 struct con_driver *con = ®istered_con_driver[i];
3960
3961 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3962 defcsw = con->con;
3963 break;
3964 }
3965 }
3966
3967 if (!defcsw)
3968 goto err;
3969
3970 while (more) {
3971 more = 0;
3972
3973 for (i = con->first; i <= con->last; i++) {
3974 if (con_driver_map[i] == defcsw) {
3975 if (first == -1)
3976 first = i;
3977 last = i;
3978 more = 1;
3979 } else if (first != -1)
3980 break;
3981 }
3982
3983 if (first == 0 && last == MAX_NR_CONSOLES -1)
3984 deflt = 1;
3985
3986 if (first != -1)
3987 do_bind_con_driver(csw, first, last, deflt);
3988
3989 first = -1;
3990 last = -1;
3991 deflt = 0;
3992 }
3993
3994err:
3995 return 0;
3996}
3997
3998static int vt_unbind(struct con_driver *con)
3999{
4000 const struct consw *csw = NULL;
4001 int i, more = 1, first = -1, last = -1, deflt = 0;
4002 int ret;
4003
4004 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
4005 goto err;
4006
4007 csw = con->con;
4008
4009 while (more) {
4010 more = 0;
4011
4012 for (i = con->first; i <= con->last; i++) {
4013 if (con_driver_map[i] == csw) {
4014 if (first == -1)
4015 first = i;
4016 last = i;
4017 more = 1;
4018 } else if (first != -1)
4019 break;
4020 }
4021
4022 if (first == 0 && last == MAX_NR_CONSOLES -1)
4023 deflt = 1;
4024
4025 if (first != -1) {
4026 ret = do_unbind_con_driver(csw, first, last, deflt);
4027 if (ret != 0)
4028 return ret;
4029 }
4030
4031 first = -1;
4032 last = -1;
4033 deflt = 0;
4034 }
4035
4036err:
4037 return 0;
4038}
4039#else
4040static inline int vt_bind(struct con_driver *con)
4041{
4042 return 0;
4043}
4044static inline int vt_unbind(struct con_driver *con)
4045{
4046 return 0;
4047}
4048#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
4049
4050static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
4051 const char *buf, size_t count)
4052{
4053 struct con_driver *con = dev_get_drvdata(dev);
4054 int bind = simple_strtoul(buf, NULL, 0);
4055
4056 console_lock();
4057
4058 if (bind)
4059 vt_bind(con);
4060 else
4061 vt_unbind(con);
4062
4063 console_unlock();
4064
4065 return count;
4066}
4067
4068static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
4069 char *buf)
4070{
4071 struct con_driver *con = dev_get_drvdata(dev);
4072 int bind;
4073
4074 console_lock();
4075 bind = con_is_bound(con->con);
4076 console_unlock();
4077
4078 return sysfs_emit(buf, "%i\n", bind);
4079}
4080
4081static ssize_t show_name(struct device *dev, struct device_attribute *attr,
4082 char *buf)
4083{
4084 struct con_driver *con = dev_get_drvdata(dev);
4085
4086 return sysfs_emit(buf, "%s %s\n",
4087 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
4088 con->desc);
4089
4090}
4091
4092static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
4093static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
4094
4095static struct attribute *con_dev_attrs[] = {
4096 &dev_attr_bind.attr,
4097 &dev_attr_name.attr,
4098 NULL
4099};
4100
4101ATTRIBUTE_GROUPS(con_dev);
4102
4103static int vtconsole_init_device(struct con_driver *con)
4104{
4105 con->flag |= CON_DRIVER_FLAG_ATTR;
4106 return 0;
4107}
4108
4109static void vtconsole_deinit_device(struct con_driver *con)
4110{
4111 con->flag &= ~CON_DRIVER_FLAG_ATTR;
4112}
4113
4114/**
4115 * con_is_bound - checks if driver is bound to the console
4116 * @csw: console driver
4117 *
4118 * RETURNS: zero if unbound, nonzero if bound
4119 *
4120 * Drivers can call this and if zero, they should release
4121 * all resources allocated on &consw.con_startup()
4122 */
4123int con_is_bound(const struct consw *csw)
4124{
4125 int i, bound = 0;
4126
4127 WARN_CONSOLE_UNLOCKED();
4128
4129 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4130 if (con_driver_map[i] == csw) {
4131 bound = 1;
4132 break;
4133 }
4134 }
4135
4136 return bound;
4137}
4138EXPORT_SYMBOL(con_is_bound);
4139
4140/**
4141 * con_is_visible - checks whether the current console is visible
4142 * @vc: virtual console
4143 *
4144 * RETURNS: zero if not visible, nonzero if visible
4145 */
4146bool con_is_visible(const struct vc_data *vc)
4147{
4148 WARN_CONSOLE_UNLOCKED();
4149
4150 return *vc->vc_display_fg == vc;
4151}
4152EXPORT_SYMBOL(con_is_visible);
4153
4154/**
4155 * con_debug_enter - prepare the console for the kernel debugger
4156 * @vc: virtual console
4157 *
4158 * Called when the console is taken over by the kernel debugger, this
4159 * function needs to save the current console state, then put the console
4160 * into a state suitable for the kernel debugger.
4161 */
4162void con_debug_enter(struct vc_data *vc)
4163{
4164 saved_fg_console = fg_console;
4165 saved_last_console = last_console;
4166 saved_want_console = want_console;
4167 saved_vc_mode = vc->vc_mode;
4168 saved_console_blanked = console_blanked;
4169 vc->vc_mode = KD_TEXT;
4170 console_blanked = 0;
4171 if (vc->vc_sw->con_debug_enter)
4172 vc->vc_sw->con_debug_enter(vc);
4173#ifdef CONFIG_KGDB_KDB
4174 /* Set the initial LINES variable if it is not already set */
4175 if (vc->vc_rows < 999) {
4176 int linecount;
4177 char lns[4];
4178 const char *setargs[3] = {
4179 "set",
4180 "LINES",
4181 lns,
4182 };
4183 if (kdbgetintenv(setargs[0], &linecount)) {
4184 snprintf(lns, 4, "%i", vc->vc_rows);
4185 kdb_set(2, setargs);
4186 }
4187 }
4188 if (vc->vc_cols < 999) {
4189 int colcount;
4190 char cols[4];
4191 const char *setargs[3] = {
4192 "set",
4193 "COLUMNS",
4194 cols,
4195 };
4196 if (kdbgetintenv(setargs[0], &colcount)) {
4197 snprintf(cols, 4, "%i", vc->vc_cols);
4198 kdb_set(2, setargs);
4199 }
4200 }
4201#endif /* CONFIG_KGDB_KDB */
4202}
4203EXPORT_SYMBOL_GPL(con_debug_enter);
4204
4205/**
4206 * con_debug_leave - restore console state
4207 *
4208 * Restore the console state to what it was before the kernel debugger
4209 * was invoked.
4210 */
4211void con_debug_leave(void)
4212{
4213 struct vc_data *vc;
4214
4215 fg_console = saved_fg_console;
4216 last_console = saved_last_console;
4217 want_console = saved_want_console;
4218 console_blanked = saved_console_blanked;
4219 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4220
4221 vc = vc_cons[fg_console].d;
4222 if (vc->vc_sw->con_debug_leave)
4223 vc->vc_sw->con_debug_leave(vc);
4224}
4225EXPORT_SYMBOL_GPL(con_debug_leave);
4226
4227static int do_register_con_driver(const struct consw *csw, int first, int last)
4228{
4229 struct module *owner = csw->owner;
4230 struct con_driver *con_driver;
4231 const char *desc;
4232 int i, retval;
4233
4234 WARN_CONSOLE_UNLOCKED();
4235
4236 if (!try_module_get(owner))
4237 return -ENODEV;
4238
4239 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4240 con_driver = ®istered_con_driver[i];
4241
4242 /* already registered */
4243 if (con_driver->con == csw) {
4244 retval = -EBUSY;
4245 goto err;
4246 }
4247 }
4248
4249 desc = csw->con_startup();
4250 if (!desc) {
4251 retval = -ENODEV;
4252 goto err;
4253 }
4254
4255 retval = -EINVAL;
4256
4257 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4258 con_driver = ®istered_con_driver[i];
4259
4260 if (con_driver->con == NULL &&
4261 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4262 con_driver->con = csw;
4263 con_driver->desc = desc;
4264 con_driver->node = i;
4265 con_driver->flag = CON_DRIVER_FLAG_MODULE |
4266 CON_DRIVER_FLAG_INIT;
4267 con_driver->first = first;
4268 con_driver->last = last;
4269 retval = 0;
4270 break;
4271 }
4272 }
4273
4274 if (retval)
4275 goto err;
4276
4277 con_driver->dev =
4278 device_create_with_groups(&vtconsole_class, NULL,
4279 MKDEV(0, con_driver->node),
4280 con_driver, con_dev_groups,
4281 "vtcon%i", con_driver->node);
4282 if (IS_ERR(con_driver->dev)) {
4283 pr_warn("Unable to create device for %s; errno = %ld\n",
4284 con_driver->desc, PTR_ERR(con_driver->dev));
4285 con_driver->dev = NULL;
4286 } else {
4287 vtconsole_init_device(con_driver);
4288 }
4289
4290err:
4291 module_put(owner);
4292 return retval;
4293}
4294
4295
4296/**
4297 * do_unregister_con_driver - unregister console driver from console layer
4298 * @csw: console driver
4299 *
4300 * DESCRIPTION: All drivers that registers to the console layer must
4301 * call this function upon exit, or if the console driver is in a state
4302 * where it won't be able to handle console services, such as the
4303 * framebuffer console without loaded framebuffer drivers.
4304 *
4305 * The driver must unbind first prior to unregistration.
4306 */
4307int do_unregister_con_driver(const struct consw *csw)
4308{
4309 int i;
4310
4311 /* cannot unregister a bound driver */
4312 if (con_is_bound(csw))
4313 return -EBUSY;
4314
4315 if (csw == conswitchp)
4316 return -EINVAL;
4317
4318 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4319 struct con_driver *con_driver = ®istered_con_driver[i];
4320
4321 if (con_driver->con == csw) {
4322 /*
4323 * Defer the removal of the sysfs entries since that
4324 * will acquire the kernfs s_active lock and we can't
4325 * acquire this lock while holding the console lock:
4326 * the unbind sysfs entry imposes already the opposite
4327 * order. Reset con already here to prevent any later
4328 * lookup to succeed and mark this slot as zombie, so
4329 * it won't get reused until we complete the removal
4330 * in the deferred work.
4331 */
4332 con_driver->con = NULL;
4333 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4334 schedule_work(&con_driver_unregister_work);
4335
4336 return 0;
4337 }
4338 }
4339
4340 return -ENODEV;
4341}
4342EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4343
4344static void con_driver_unregister_callback(struct work_struct *ignored)
4345{
4346 int i;
4347
4348 console_lock();
4349
4350 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4351 struct con_driver *con_driver = ®istered_con_driver[i];
4352
4353 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4354 continue;
4355
4356 console_unlock();
4357
4358 vtconsole_deinit_device(con_driver);
4359 device_destroy(&vtconsole_class, MKDEV(0, con_driver->node));
4360
4361 console_lock();
4362
4363 if (WARN_ON_ONCE(con_driver->con))
4364 con_driver->con = NULL;
4365 con_driver->desc = NULL;
4366 con_driver->dev = NULL;
4367 con_driver->node = 0;
4368 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4369 con_driver->flag = 0;
4370 con_driver->first = 0;
4371 con_driver->last = 0;
4372 }
4373
4374 console_unlock();
4375}
4376
4377/*
4378 * If we support more console drivers, this function is used
4379 * when a driver wants to take over some existing consoles
4380 * and become default driver for newly opened ones.
4381 *
4382 * do_take_over_console is basically a register followed by bind
4383 */
4384int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4385{
4386 int err;
4387
4388 err = do_register_con_driver(csw, first, last);
4389 /*
4390 * If we get an busy error we still want to bind the console driver
4391 * and return success, as we may have unbound the console driver
4392 * but not unregistered it.
4393 */
4394 if (err == -EBUSY)
4395 err = 0;
4396 if (!err)
4397 do_bind_con_driver(csw, first, last, deflt);
4398
4399 return err;
4400}
4401EXPORT_SYMBOL_GPL(do_take_over_console);
4402
4403
4404/*
4405 * give_up_console is a wrapper to unregister_con_driver. It will only
4406 * work if driver is fully unbound.
4407 */
4408void give_up_console(const struct consw *csw)
4409{
4410 console_lock();
4411 do_unregister_con_driver(csw);
4412 console_unlock();
4413}
4414EXPORT_SYMBOL(give_up_console);
4415
4416static int __init vtconsole_class_init(void)
4417{
4418 int i;
4419
4420 i = class_register(&vtconsole_class);
4421 if (i)
4422 pr_warn("Unable to create vt console class; errno = %d\n", i);
4423
4424 /* Add system drivers to sysfs */
4425 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4426 struct con_driver *con = ®istered_con_driver[i];
4427
4428 if (con->con && !con->dev) {
4429 con->dev =
4430 device_create_with_groups(&vtconsole_class, NULL,
4431 MKDEV(0, con->node),
4432 con, con_dev_groups,
4433 "vtcon%i", con->node);
4434
4435 if (IS_ERR(con->dev)) {
4436 pr_warn("Unable to create device for %s; errno = %ld\n",
4437 con->desc, PTR_ERR(con->dev));
4438 con->dev = NULL;
4439 } else {
4440 vtconsole_init_device(con);
4441 }
4442 }
4443 }
4444
4445 return 0;
4446}
4447postcore_initcall(vtconsole_class_init);
4448
4449/*
4450 * Screen blanking
4451 */
4452
4453static int set_vesa_blanking(u8 __user *mode_user)
4454{
4455 u8 mode;
4456
4457 if (get_user(mode, mode_user))
4458 return -EFAULT;
4459
4460 console_lock();
4461 vesa_blank_mode = (mode <= VESA_BLANK_MAX) ? mode : VESA_NO_BLANKING;
4462 console_unlock();
4463
4464 return 0;
4465}
4466
4467void do_blank_screen(int entering_gfx)
4468{
4469 struct vc_data *vc = vc_cons[fg_console].d;
4470 int i;
4471
4472 might_sleep();
4473
4474 WARN_CONSOLE_UNLOCKED();
4475
4476 if (console_blanked) {
4477 if (blank_state == blank_vesa_wait) {
4478 blank_state = blank_off;
4479 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4480 }
4481 return;
4482 }
4483
4484 /* entering graphics mode? */
4485 if (entering_gfx) {
4486 hide_cursor(vc);
4487 save_screen(vc);
4488 vc->vc_sw->con_blank(vc, VESA_VSYNC_SUSPEND, 1);
4489 console_blanked = fg_console + 1;
4490 blank_state = blank_off;
4491 set_origin(vc);
4492 return;
4493 }
4494
4495 blank_state = blank_off;
4496
4497 /* don't blank graphics */
4498 if (vc->vc_mode != KD_TEXT) {
4499 console_blanked = fg_console + 1;
4500 return;
4501 }
4502
4503 hide_cursor(vc);
4504 del_timer_sync(&console_timer);
4505 blank_timer_expired = 0;
4506
4507 save_screen(vc);
4508 /* In case we need to reset origin, blanking hook returns 1 */
4509 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? VESA_VSYNC_SUSPEND :
4510 (vesa_blank_mode + 1), 0);
4511 console_blanked = fg_console + 1;
4512 if (i)
4513 set_origin(vc);
4514
4515 if (console_blank_hook && console_blank_hook(1))
4516 return;
4517
4518 if (vesa_off_interval && vesa_blank_mode) {
4519 blank_state = blank_vesa_wait;
4520 mod_timer(&console_timer, jiffies + vesa_off_interval);
4521 }
4522 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4523}
4524EXPORT_SYMBOL(do_blank_screen);
4525
4526/*
4527 * Called by timer as well as from vt_console_driver
4528 */
4529void do_unblank_screen(int leaving_gfx)
4530{
4531 struct vc_data *vc;
4532
4533 /* This should now always be called from a "sane" (read: can schedule)
4534 * context for the sake of the low level drivers, except in the special
4535 * case of oops_in_progress
4536 */
4537 if (!oops_in_progress)
4538 might_sleep();
4539
4540 WARN_CONSOLE_UNLOCKED();
4541
4542 ignore_poke = 0;
4543 if (!console_blanked)
4544 return;
4545 if (!vc_cons_allocated(fg_console)) {
4546 /* impossible */
4547 pr_warn("unblank_screen: tty %d not allocated ??\n",
4548 fg_console + 1);
4549 return;
4550 }
4551 vc = vc_cons[fg_console].d;
4552 if (vc->vc_mode != KD_TEXT)
4553 return; /* but leave console_blanked != 0 */
4554
4555 if (blankinterval) {
4556 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4557 blank_state = blank_normal_wait;
4558 }
4559
4560 console_blanked = 0;
4561 if (vc->vc_sw->con_blank(vc, VESA_NO_BLANKING, leaving_gfx))
4562 /* Low-level driver cannot restore -> do it ourselves */
4563 update_screen(vc);
4564 if (console_blank_hook)
4565 console_blank_hook(0);
4566 set_palette(vc);
4567 set_cursor(vc);
4568 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4569}
4570EXPORT_SYMBOL(do_unblank_screen);
4571
4572/*
4573 * This is called by the outside world to cause a forced unblank, mostly for
4574 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4575 * call it with 1 as an argument and so force a mode restore... that may kill
4576 * X or at least garbage the screen but would also make the Oops visible...
4577 */
4578static void unblank_screen(void)
4579{
4580 do_unblank_screen(0);
4581}
4582
4583/*
4584 * We defer the timer blanking to work queue so it can take the console mutex
4585 * (console operations can still happen at irq time, but only from printk which
4586 * has the console mutex. Not perfect yet, but better than no locking
4587 */
4588static void blank_screen_t(struct timer_list *unused)
4589{
4590 blank_timer_expired = 1;
4591 schedule_work(&console_work);
4592}
4593
4594void poke_blanked_console(void)
4595{
4596 WARN_CONSOLE_UNLOCKED();
4597
4598 /* Add this so we quickly catch whoever might call us in a non
4599 * safe context. Nowadays, unblank_screen() isn't to be called in
4600 * atomic contexts and is allowed to schedule (with the special case
4601 * of oops_in_progress, but that isn't of any concern for this
4602 * function. --BenH.
4603 */
4604 might_sleep();
4605
4606 /* This isn't perfectly race free, but a race here would be mostly harmless,
4607 * at worst, we'll do a spurious blank and it's unlikely
4608 */
4609 del_timer(&console_timer);
4610 blank_timer_expired = 0;
4611
4612 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4613 return;
4614 if (console_blanked)
4615 unblank_screen();
4616 else if (blankinterval) {
4617 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4618 blank_state = blank_normal_wait;
4619 }
4620}
4621
4622/*
4623 * Palettes
4624 */
4625
4626static void set_palette(struct vc_data *vc)
4627{
4628 WARN_CONSOLE_UNLOCKED();
4629
4630 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4631 vc->vc_sw->con_set_palette(vc, color_table);
4632}
4633
4634/*
4635 * Load palette into the DAC registers. arg points to a colour
4636 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4637 */
4638
4639int con_set_cmap(unsigned char __user *arg)
4640{
4641 int i, j, k;
4642 unsigned char colormap[3*16];
4643
4644 if (copy_from_user(colormap, arg, sizeof(colormap)))
4645 return -EFAULT;
4646
4647 console_lock();
4648 for (i = k = 0; i < 16; i++) {
4649 default_red[i] = colormap[k++];
4650 default_grn[i] = colormap[k++];
4651 default_blu[i] = colormap[k++];
4652 }
4653 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4654 if (!vc_cons_allocated(i))
4655 continue;
4656 for (j = k = 0; j < 16; j++) {
4657 vc_cons[i].d->vc_palette[k++] = default_red[j];
4658 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4659 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4660 }
4661 set_palette(vc_cons[i].d);
4662 }
4663 console_unlock();
4664
4665 return 0;
4666}
4667
4668int con_get_cmap(unsigned char __user *arg)
4669{
4670 int i, k;
4671 unsigned char colormap[3*16];
4672
4673 console_lock();
4674 for (i = k = 0; i < 16; i++) {
4675 colormap[k++] = default_red[i];
4676 colormap[k++] = default_grn[i];
4677 colormap[k++] = default_blu[i];
4678 }
4679 console_unlock();
4680
4681 if (copy_to_user(arg, colormap, sizeof(colormap)))
4682 return -EFAULT;
4683
4684 return 0;
4685}
4686
4687void reset_palette(struct vc_data *vc)
4688{
4689 int j, k;
4690 for (j=k=0; j<16; j++) {
4691 vc->vc_palette[k++] = default_red[j];
4692 vc->vc_palette[k++] = default_grn[j];
4693 vc->vc_palette[k++] = default_blu[j];
4694 }
4695 set_palette(vc);
4696}
4697
4698/*
4699 * Font switching
4700 *
4701 * Currently we only support fonts up to 128 pixels wide, at a maximum height
4702 * of 128 pixels. Userspace fontdata may have to be stored with 32 bytes
4703 * (shorts/ints, depending on width) reserved for each character which is
4704 * kinda wasty, but this is done in order to maintain compatibility with the
4705 * EGA/VGA fonts. It is up to the actual low-level console-driver convert data
4706 * into its favorite format (maybe we should add a `fontoffset' field to the
4707 * `display' structure so we won't have to convert the fontdata all the time.
4708 * /Jes
4709 */
4710
4711#define max_font_width 64
4712#define max_font_height 128
4713#define max_font_glyphs 512
4714#define max_font_size (max_font_glyphs*max_font_width*max_font_height)
4715
4716static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4717{
4718 struct console_font font;
4719 int rc = -EINVAL;
4720 int c;
4721 unsigned int vpitch = op->op == KD_FONT_OP_GET_TALL ? op->height : 32;
4722
4723 if (vpitch > max_font_height)
4724 return -EINVAL;
4725
4726 if (op->data) {
4727 font.data = kvzalloc(max_font_size, GFP_KERNEL);
4728 if (!font.data)
4729 return -ENOMEM;
4730 } else
4731 font.data = NULL;
4732
4733 console_lock();
4734 if (vc->vc_mode != KD_TEXT)
4735 rc = -EINVAL;
4736 else if (vc->vc_sw->con_font_get)
4737 rc = vc->vc_sw->con_font_get(vc, &font, vpitch);
4738 else
4739 rc = -ENOSYS;
4740 console_unlock();
4741
4742 if (rc)
4743 goto out;
4744
4745 c = (font.width+7)/8 * vpitch * font.charcount;
4746
4747 if (op->data && font.charcount > op->charcount)
4748 rc = -ENOSPC;
4749 if (font.width > op->width || font.height > op->height)
4750 rc = -ENOSPC;
4751 if (rc)
4752 goto out;
4753
4754 op->height = font.height;
4755 op->width = font.width;
4756 op->charcount = font.charcount;
4757
4758 if (op->data && copy_to_user(op->data, font.data, c))
4759 rc = -EFAULT;
4760
4761out:
4762 kvfree(font.data);
4763 return rc;
4764}
4765
4766static int con_font_set(struct vc_data *vc, const struct console_font_op *op)
4767{
4768 struct console_font font;
4769 int rc = -EINVAL;
4770 int size;
4771 unsigned int vpitch = op->op == KD_FONT_OP_SET_TALL ? op->height : 32;
4772
4773 if (vc->vc_mode != KD_TEXT)
4774 return -EINVAL;
4775 if (!op->data)
4776 return -EINVAL;
4777 if (op->charcount > max_font_glyphs)
4778 return -EINVAL;
4779 if (op->width <= 0 || op->width > max_font_width || !op->height ||
4780 op->height > max_font_height)
4781 return -EINVAL;
4782 if (vpitch < op->height)
4783 return -EINVAL;
4784 size = (op->width+7)/8 * vpitch * op->charcount;
4785 if (size > max_font_size)
4786 return -ENOSPC;
4787
4788 font.data = memdup_user(op->data, size);
4789 if (IS_ERR(font.data))
4790 return PTR_ERR(font.data);
4791
4792 font.charcount = op->charcount;
4793 font.width = op->width;
4794 font.height = op->height;
4795
4796 console_lock();
4797 if (vc->vc_mode != KD_TEXT)
4798 rc = -EINVAL;
4799 else if (vc->vc_sw->con_font_set) {
4800 if (vc_is_sel(vc))
4801 clear_selection();
4802 rc = vc->vc_sw->con_font_set(vc, &font, vpitch, op->flags);
4803 } else
4804 rc = -ENOSYS;
4805 console_unlock();
4806 kfree(font.data);
4807 return rc;
4808}
4809
4810static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4811{
4812 struct console_font font = {.width = op->width, .height = op->height};
4813 char name[MAX_FONT_NAME];
4814 char *s = name;
4815 int rc;
4816
4817
4818 if (!op->data)
4819 s = NULL;
4820 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4821 return -EFAULT;
4822 else
4823 name[MAX_FONT_NAME - 1] = 0;
4824
4825 console_lock();
4826 if (vc->vc_mode != KD_TEXT) {
4827 console_unlock();
4828 return -EINVAL;
4829 }
4830 if (vc->vc_sw->con_font_default) {
4831 if (vc_is_sel(vc))
4832 clear_selection();
4833 rc = vc->vc_sw->con_font_default(vc, &font, s);
4834 } else
4835 rc = -ENOSYS;
4836 console_unlock();
4837 if (!rc) {
4838 op->width = font.width;
4839 op->height = font.height;
4840 }
4841 return rc;
4842}
4843
4844int con_font_op(struct vc_data *vc, struct console_font_op *op)
4845{
4846 switch (op->op) {
4847 case KD_FONT_OP_SET:
4848 case KD_FONT_OP_SET_TALL:
4849 return con_font_set(vc, op);
4850 case KD_FONT_OP_GET:
4851 case KD_FONT_OP_GET_TALL:
4852 return con_font_get(vc, op);
4853 case KD_FONT_OP_SET_DEFAULT:
4854 return con_font_default(vc, op);
4855 case KD_FONT_OP_COPY:
4856 /* was buggy and never really used */
4857 return -EINVAL;
4858 }
4859 return -ENOSYS;
4860}
4861
4862/*
4863 * Interface exported to selection and vcs.
4864 */
4865
4866/* used by selection */
4867u16 screen_glyph(const struct vc_data *vc, int offset)
4868{
4869 u16 w = scr_readw(screenpos(vc, offset, true));
4870 u16 c = w & 0xff;
4871
4872 if (w & vc->vc_hi_font_mask)
4873 c |= 0x100;
4874 return c;
4875}
4876EXPORT_SYMBOL_GPL(screen_glyph);
4877
4878u32 screen_glyph_unicode(const struct vc_data *vc, int n)
4879{
4880 u32 **uni_lines = vc->vc_uni_lines;
4881
4882 if (uni_lines)
4883 return uni_lines[n / vc->vc_cols][n % vc->vc_cols];
4884
4885 return inverse_translate(vc, screen_glyph(vc, n * 2), true);
4886}
4887EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4888
4889/* used by vcs - note the word offset */
4890unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
4891{
4892 return screenpos(vc, 2 * w_offset, viewed);
4893}
4894EXPORT_SYMBOL_GPL(screen_pos);
4895
4896void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
4897{
4898 /* clamp values if they don't fit */
4899 xy[0] = min(vc->state.x, 0xFFu);
4900 xy[1] = min(vc->state.y, 0xFFu);
4901}
4902
4903void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
4904{
4905 hide_cursor(vc);
4906 gotoxy(vc, xy[0], xy[1]);
4907 set_cursor(vc);
4908}
4909
4910u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
4911{
4912 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4913 return softcursor_original;
4914 return scr_readw(org);
4915}
4916
4917void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4918{
4919 scr_writew(val, org);
4920 if ((unsigned long)org == vc->vc_pos) {
4921 softcursor_original = -1;
4922 add_softcursor(vc);
4923 }
4924}
4925
4926void vcs_scr_updated(struct vc_data *vc)
4927{
4928 notify_update(vc);
4929}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6/*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
61 * deletion SMP-safe. 17Jun00, Andrew Morton
62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72 */
73
74#include <linux/module.h>
75#include <linux/types.h>
76#include <linux/sched/signal.h>
77#include <linux/tty.h>
78#include <linux/tty_flip.h>
79#include <linux/kernel.h>
80#include <linux/string.h>
81#include <linux/errno.h>
82#include <linux/kd.h>
83#include <linux/slab.h>
84#include <linux/major.h>
85#include <linux/mm.h>
86#include <linux/console.h>
87#include <linux/init.h>
88#include <linux/mutex.h>
89#include <linux/vt_kern.h>
90#include <linux/selection.h>
91#include <linux/tiocl.h>
92#include <linux/kbd_kern.h>
93#include <linux/consolemap.h>
94#include <linux/timer.h>
95#include <linux/interrupt.h>
96#include <linux/workqueue.h>
97#include <linux/pm.h>
98#include <linux/font.h>
99#include <linux/bitops.h>
100#include <linux/notifier.h>
101#include <linux/device.h>
102#include <linux/io.h>
103#include <linux/uaccess.h>
104#include <linux/kdb.h>
105#include <linux/ctype.h>
106#include <linux/bsearch.h>
107
108#define MAX_NR_CON_DRIVER 16
109
110#define CON_DRIVER_FLAG_MODULE 1
111#define CON_DRIVER_FLAG_INIT 2
112#define CON_DRIVER_FLAG_ATTR 4
113#define CON_DRIVER_FLAG_ZOMBIE 8
114
115struct con_driver {
116 const struct consw *con;
117 const char *desc;
118 struct device *dev;
119 int node;
120 int first;
121 int last;
122 int flag;
123};
124
125static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
126const struct consw *conswitchp;
127
128/* A bitmap for codes <32. A bit of 1 indicates that the code
129 * corresponding to that bit number invokes some special action
130 * (such as cursor movement) and should not be displayed as a
131 * glyph unless the disp_ctrl mode is explicitly enabled.
132 */
133#define CTRL_ACTION 0x0d00ff81
134#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
135
136/*
137 * Here is the default bell parameters: 750HZ, 1/8th of a second
138 */
139#define DEFAULT_BELL_PITCH 750
140#define DEFAULT_BELL_DURATION (HZ/8)
141#define DEFAULT_CURSOR_BLINK_MS 200
142
143struct vc vc_cons [MAX_NR_CONSOLES];
144
145#ifndef VT_SINGLE_DRIVER
146static const struct consw *con_driver_map[MAX_NR_CONSOLES];
147#endif
148
149static int con_open(struct tty_struct *, struct file *);
150static void vc_init(struct vc_data *vc, unsigned int rows,
151 unsigned int cols, int do_clear);
152static void gotoxy(struct vc_data *vc, int new_x, int new_y);
153static void save_cur(struct vc_data *vc);
154static void reset_terminal(struct vc_data *vc, int do_clear);
155static void con_flush_chars(struct tty_struct *tty);
156static int set_vesa_blanking(char __user *p);
157static void set_cursor(struct vc_data *vc);
158static void hide_cursor(struct vc_data *vc);
159static void console_callback(struct work_struct *ignored);
160static void con_driver_unregister_callback(struct work_struct *ignored);
161static void blank_screen_t(struct timer_list *unused);
162static void set_palette(struct vc_data *vc);
163
164#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
165
166static int printable; /* Is console ready for printing? */
167int default_utf8 = true;
168module_param(default_utf8, int, S_IRUGO | S_IWUSR);
169int global_cursor_default = -1;
170module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
171
172static int cur_default = CUR_DEFAULT;
173module_param(cur_default, int, S_IRUGO | S_IWUSR);
174
175/*
176 * ignore_poke: don't unblank the screen when things are typed. This is
177 * mainly for the privacy of braille terminal users.
178 */
179static int ignore_poke;
180
181int do_poke_blanked_console;
182int console_blanked;
183
184static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
185static int vesa_off_interval;
186static int blankinterval;
187core_param(consoleblank, blankinterval, int, 0444);
188
189static DECLARE_WORK(console_work, console_callback);
190static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
191
192/*
193 * fg_console is the current virtual console,
194 * last_console is the last used one,
195 * want_console is the console we want to switch to,
196 * saved_* variants are for save/restore around kernel debugger enter/leave
197 */
198int fg_console;
199int last_console;
200int want_console = -1;
201static int saved_fg_console;
202static int saved_last_console;
203static int saved_want_console;
204static int saved_vc_mode;
205static int saved_console_blanked;
206
207/*
208 * For each existing display, we have a pointer to console currently visible
209 * on that display, allowing consoles other than fg_console to be refreshed
210 * appropriately. Unless the low-level driver supplies its own display_fg
211 * variable, we use this one for the "master display".
212 */
213static struct vc_data *master_display_fg;
214
215/*
216 * Unfortunately, we need to delay tty echo when we're currently writing to the
217 * console since the code is (and always was) not re-entrant, so we schedule
218 * all flip requests to process context with schedule-task() and run it from
219 * console_callback().
220 */
221
222/*
223 * For the same reason, we defer scrollback to the console callback.
224 */
225static int scrollback_delta;
226
227/*
228 * Hook so that the power management routines can (un)blank
229 * the console on our behalf.
230 */
231int (*console_blank_hook)(int);
232
233static DEFINE_TIMER(console_timer, blank_screen_t);
234static int blank_state;
235static int blank_timer_expired;
236enum {
237 blank_off = 0,
238 blank_normal_wait,
239 blank_vesa_wait,
240};
241
242/*
243 * /sys/class/tty/tty0/
244 *
245 * the attribute 'active' contains the name of the current vc
246 * console and it supports poll() to detect vc switches
247 */
248static struct device *tty0dev;
249
250/*
251 * Notifier list for console events.
252 */
253static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
254
255int register_vt_notifier(struct notifier_block *nb)
256{
257 return atomic_notifier_chain_register(&vt_notifier_list, nb);
258}
259EXPORT_SYMBOL_GPL(register_vt_notifier);
260
261int unregister_vt_notifier(struct notifier_block *nb)
262{
263 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
264}
265EXPORT_SYMBOL_GPL(unregister_vt_notifier);
266
267static void notify_write(struct vc_data *vc, unsigned int unicode)
268{
269 struct vt_notifier_param param = { .vc = vc, .c = unicode };
270 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
271}
272
273static void notify_update(struct vc_data *vc)
274{
275 struct vt_notifier_param param = { .vc = vc };
276 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
277}
278/*
279 * Low-Level Functions
280 */
281
282static inline bool con_is_fg(const struct vc_data *vc)
283{
284 return vc->vc_num == fg_console;
285}
286
287static inline bool con_should_update(const struct vc_data *vc)
288{
289 return con_is_visible(vc) && !console_blanked;
290}
291
292static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
293{
294 unsigned short *p;
295
296 if (!viewed)
297 p = (unsigned short *)(vc->vc_origin + offset);
298 else if (!vc->vc_sw->con_screen_pos)
299 p = (unsigned short *)(vc->vc_visible_origin + offset);
300 else
301 p = vc->vc_sw->con_screen_pos(vc, offset);
302 return p;
303}
304
305/* Called from the keyboard irq path.. */
306static inline void scrolldelta(int lines)
307{
308 /* FIXME */
309 /* scrolldelta needs some kind of consistency lock, but the BKL was
310 and still is not protecting versus the scheduled back end */
311 scrollback_delta += lines;
312 schedule_console_callback();
313}
314
315void schedule_console_callback(void)
316{
317 schedule_work(&console_work);
318}
319
320static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
321 enum con_scroll dir, unsigned int nr)
322{
323 u16 *clear, *d, *s;
324
325 if (t + nr >= b)
326 nr = b - t - 1;
327 if (b > vc->vc_rows || t >= b || nr < 1)
328 return;
329 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
330 return;
331
332 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
333 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
334
335 if (dir == SM_UP) {
336 clear = s + (b - t - nr) * vc->vc_cols;
337 swap(s, d);
338 }
339 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
340 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
341}
342
343static void do_update_region(struct vc_data *vc, unsigned long start, int count)
344{
345 unsigned int xx, yy, offset;
346 u16 *p;
347
348 p = (u16 *) start;
349 if (!vc->vc_sw->con_getxy) {
350 offset = (start - vc->vc_origin) / 2;
351 xx = offset % vc->vc_cols;
352 yy = offset / vc->vc_cols;
353 } else {
354 int nxx, nyy;
355 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
356 xx = nxx; yy = nyy;
357 }
358 for(;;) {
359 u16 attrib = scr_readw(p) & 0xff00;
360 int startx = xx;
361 u16 *q = p;
362 while (xx < vc->vc_cols && count) {
363 if (attrib != (scr_readw(p) & 0xff00)) {
364 if (p > q)
365 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
366 startx = xx;
367 q = p;
368 attrib = scr_readw(p) & 0xff00;
369 }
370 p++;
371 xx++;
372 count--;
373 }
374 if (p > q)
375 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
376 if (!count)
377 break;
378 xx = 0;
379 yy++;
380 if (vc->vc_sw->con_getxy) {
381 p = (u16 *)start;
382 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
383 }
384 }
385}
386
387void update_region(struct vc_data *vc, unsigned long start, int count)
388{
389 WARN_CONSOLE_UNLOCKED();
390
391 if (con_should_update(vc)) {
392 hide_cursor(vc);
393 do_update_region(vc, start, count);
394 set_cursor(vc);
395 }
396}
397
398/* Structure of attributes is hardware-dependent */
399
400static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
401 u8 _underline, u8 _reverse, u8 _italic)
402{
403 if (vc->vc_sw->con_build_attr)
404 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
405 _blink, _underline, _reverse, _italic);
406
407/*
408 * ++roman: I completely changed the attribute format for monochrome
409 * mode (!can_do_color). The formerly used MDA (monochrome display
410 * adapter) format didn't allow the combination of certain effects.
411 * Now the attribute is just a bit vector:
412 * Bit 0..1: intensity (0..2)
413 * Bit 2 : underline
414 * Bit 3 : reverse
415 * Bit 7 : blink
416 */
417 {
418 u8 a = _color;
419 if (!vc->vc_can_do_color)
420 return _intensity |
421 (_italic ? 2 : 0) |
422 (_underline ? 4 : 0) |
423 (_reverse ? 8 : 0) |
424 (_blink ? 0x80 : 0);
425 if (_italic)
426 a = (a & 0xF0) | vc->vc_itcolor;
427 else if (_underline)
428 a = (a & 0xf0) | vc->vc_ulcolor;
429 else if (_intensity == 0)
430 a = (a & 0xf0) | vc->vc_halfcolor;
431 if (_reverse)
432 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
433 if (_blink)
434 a ^= 0x80;
435 if (_intensity == 2)
436 a ^= 0x08;
437 if (vc->vc_hi_font_mask == 0x100)
438 a <<= 1;
439 return a;
440 }
441}
442
443static void update_attr(struct vc_data *vc)
444{
445 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
446 vc->vc_blink, vc->vc_underline,
447 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
448 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
449}
450
451/* Note: inverting the screen twice should revert to the original state */
452void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
453{
454 unsigned short *p;
455
456 WARN_CONSOLE_UNLOCKED();
457
458 count /= 2;
459 p = screenpos(vc, offset, viewed);
460 if (vc->vc_sw->con_invert_region) {
461 vc->vc_sw->con_invert_region(vc, p, count);
462 } else {
463 u16 *q = p;
464 int cnt = count;
465 u16 a;
466
467 if (!vc->vc_can_do_color) {
468 while (cnt--) {
469 a = scr_readw(q);
470 a ^= 0x0800;
471 scr_writew(a, q);
472 q++;
473 }
474 } else if (vc->vc_hi_font_mask == 0x100) {
475 while (cnt--) {
476 a = scr_readw(q);
477 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
478 scr_writew(a, q);
479 q++;
480 }
481 } else {
482 while (cnt--) {
483 a = scr_readw(q);
484 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
485 scr_writew(a, q);
486 q++;
487 }
488 }
489 }
490
491 if (con_should_update(vc))
492 do_update_region(vc, (unsigned long) p, count);
493 notify_update(vc);
494}
495
496/* used by selection: complement pointer position */
497void complement_pos(struct vc_data *vc, int offset)
498{
499 static int old_offset = -1;
500 static unsigned short old;
501 static unsigned short oldx, oldy;
502
503 WARN_CONSOLE_UNLOCKED();
504
505 if (old_offset != -1 && old_offset >= 0 &&
506 old_offset < vc->vc_screenbuf_size) {
507 scr_writew(old, screenpos(vc, old_offset, 1));
508 if (con_should_update(vc))
509 vc->vc_sw->con_putc(vc, old, oldy, oldx);
510 notify_update(vc);
511 }
512
513 old_offset = offset;
514
515 if (offset != -1 && offset >= 0 &&
516 offset < vc->vc_screenbuf_size) {
517 unsigned short new;
518 unsigned short *p;
519 p = screenpos(vc, offset, 1);
520 old = scr_readw(p);
521 new = old ^ vc->vc_complement_mask;
522 scr_writew(new, p);
523 if (con_should_update(vc)) {
524 oldx = (offset >> 1) % vc->vc_cols;
525 oldy = (offset >> 1) / vc->vc_cols;
526 vc->vc_sw->con_putc(vc, new, oldy, oldx);
527 }
528 notify_update(vc);
529 }
530}
531
532static void insert_char(struct vc_data *vc, unsigned int nr)
533{
534 unsigned short *p = (unsigned short *) vc->vc_pos;
535
536 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
537 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
538 vc->vc_need_wrap = 0;
539 if (con_should_update(vc))
540 do_update_region(vc, (unsigned long) p,
541 vc->vc_cols - vc->vc_x);
542}
543
544static void delete_char(struct vc_data *vc, unsigned int nr)
545{
546 unsigned short *p = (unsigned short *) vc->vc_pos;
547
548 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
549 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
550 nr * 2);
551 vc->vc_need_wrap = 0;
552 if (con_should_update(vc))
553 do_update_region(vc, (unsigned long) p,
554 vc->vc_cols - vc->vc_x);
555}
556
557static int softcursor_original = -1;
558
559static void add_softcursor(struct vc_data *vc)
560{
561 int i = scr_readw((u16 *) vc->vc_pos);
562 u32 type = vc->vc_cursor_type;
563
564 if (! (type & 0x10)) return;
565 if (softcursor_original != -1) return;
566 softcursor_original = i;
567 i |= ((type >> 8) & 0xff00 );
568 i ^= ((type) & 0xff00 );
569 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
570 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
571 scr_writew(i, (u16 *) vc->vc_pos);
572 if (con_should_update(vc))
573 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
574}
575
576static void hide_softcursor(struct vc_data *vc)
577{
578 if (softcursor_original != -1) {
579 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
580 if (con_should_update(vc))
581 vc->vc_sw->con_putc(vc, softcursor_original,
582 vc->vc_y, vc->vc_x);
583 softcursor_original = -1;
584 }
585}
586
587static void hide_cursor(struct vc_data *vc)
588{
589 if (vc == sel_cons)
590 clear_selection();
591 vc->vc_sw->con_cursor(vc, CM_ERASE);
592 hide_softcursor(vc);
593}
594
595static void set_cursor(struct vc_data *vc)
596{
597 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
598 return;
599 if (vc->vc_deccm) {
600 if (vc == sel_cons)
601 clear_selection();
602 add_softcursor(vc);
603 if ((vc->vc_cursor_type & 0x0f) != 1)
604 vc->vc_sw->con_cursor(vc, CM_DRAW);
605 } else
606 hide_cursor(vc);
607}
608
609static void set_origin(struct vc_data *vc)
610{
611 WARN_CONSOLE_UNLOCKED();
612
613 if (!con_is_visible(vc) ||
614 !vc->vc_sw->con_set_origin ||
615 !vc->vc_sw->con_set_origin(vc))
616 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
617 vc->vc_visible_origin = vc->vc_origin;
618 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
619 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
620}
621
622static void save_screen(struct vc_data *vc)
623{
624 WARN_CONSOLE_UNLOCKED();
625
626 if (vc->vc_sw->con_save_screen)
627 vc->vc_sw->con_save_screen(vc);
628}
629
630static void flush_scrollback(struct vc_data *vc)
631{
632 WARN_CONSOLE_UNLOCKED();
633
634 if (vc->vc_sw->con_flush_scrollback)
635 vc->vc_sw->con_flush_scrollback(vc);
636}
637
638/*
639 * Redrawing of screen
640 */
641
642void clear_buffer_attributes(struct vc_data *vc)
643{
644 unsigned short *p = (unsigned short *)vc->vc_origin;
645 int count = vc->vc_screenbuf_size / 2;
646 int mask = vc->vc_hi_font_mask | 0xff;
647
648 for (; count > 0; count--, p++) {
649 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
650 }
651}
652
653void redraw_screen(struct vc_data *vc, int is_switch)
654{
655 int redraw = 0;
656
657 WARN_CONSOLE_UNLOCKED();
658
659 if (!vc) {
660 /* strange ... */
661 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
662 return;
663 }
664
665 if (is_switch) {
666 struct vc_data *old_vc = vc_cons[fg_console].d;
667 if (old_vc == vc)
668 return;
669 if (!con_is_visible(vc))
670 redraw = 1;
671 *vc->vc_display_fg = vc;
672 fg_console = vc->vc_num;
673 hide_cursor(old_vc);
674 if (!con_is_visible(old_vc)) {
675 save_screen(old_vc);
676 set_origin(old_vc);
677 }
678 if (tty0dev)
679 sysfs_notify(&tty0dev->kobj, NULL, "active");
680 } else {
681 hide_cursor(vc);
682 redraw = 1;
683 }
684
685 if (redraw) {
686 int update;
687 int old_was_color = vc->vc_can_do_color;
688
689 set_origin(vc);
690 update = vc->vc_sw->con_switch(vc);
691 set_palette(vc);
692 /*
693 * If console changed from mono<->color, the best we can do
694 * is to clear the buffer attributes. As it currently stands,
695 * rebuilding new attributes from the old buffer is not doable
696 * without overly complex code.
697 */
698 if (old_was_color != vc->vc_can_do_color) {
699 update_attr(vc);
700 clear_buffer_attributes(vc);
701 }
702
703 /* Forcibly update if we're panicing */
704 if ((update && vc->vc_mode != KD_GRAPHICS) ||
705 vt_force_oops_output(vc))
706 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
707 }
708 set_cursor(vc);
709 if (is_switch) {
710 set_leds();
711 compute_shiftstate();
712 notify_update(vc);
713 }
714}
715
716/*
717 * Allocation, freeing and resizing of VTs.
718 */
719
720int vc_cons_allocated(unsigned int i)
721{
722 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
723}
724
725static void visual_init(struct vc_data *vc, int num, int init)
726{
727 /* ++Geert: vc->vc_sw->con_init determines console size */
728 if (vc->vc_sw)
729 module_put(vc->vc_sw->owner);
730 vc->vc_sw = conswitchp;
731#ifndef VT_SINGLE_DRIVER
732 if (con_driver_map[num])
733 vc->vc_sw = con_driver_map[num];
734#endif
735 __module_get(vc->vc_sw->owner);
736 vc->vc_num = num;
737 vc->vc_display_fg = &master_display_fg;
738 if (vc->vc_uni_pagedir_loc)
739 con_free_unimap(vc);
740 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
741 vc->vc_uni_pagedir = NULL;
742 vc->vc_hi_font_mask = 0;
743 vc->vc_complement_mask = 0;
744 vc->vc_can_do_color = 0;
745 vc->vc_panic_force_write = false;
746 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
747 vc->vc_sw->con_init(vc, init);
748 if (!vc->vc_complement_mask)
749 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
750 vc->vc_s_complement_mask = vc->vc_complement_mask;
751 vc->vc_size_row = vc->vc_cols << 1;
752 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
753}
754
755int vc_allocate(unsigned int currcons) /* return 0 on success */
756{
757 struct vt_notifier_param param;
758 struct vc_data *vc;
759
760 WARN_CONSOLE_UNLOCKED();
761
762 if (currcons >= MAX_NR_CONSOLES)
763 return -ENXIO;
764
765 if (vc_cons[currcons].d)
766 return 0;
767
768 /* due to the granularity of kmalloc, we waste some memory here */
769 /* the alloc is done in two steps, to optimize the common situation
770 of a 25x80 console (structsize=216, screenbuf_size=4000) */
771 /* although the numbers above are not valid since long ago, the
772 point is still up-to-date and the comment still has its value
773 even if only as a historical artifact. --mj, July 1998 */
774 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
775 if (!vc)
776 return -ENOMEM;
777
778 vc_cons[currcons].d = vc;
779 tty_port_init(&vc->port);
780 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
781
782 visual_init(vc, currcons, 1);
783
784 if (!*vc->vc_uni_pagedir_loc)
785 con_set_default_unimap(vc);
786
787 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
788 if (!vc->vc_screenbuf)
789 goto err_free;
790
791 /* If no drivers have overridden us and the user didn't pass a
792 boot option, default to displaying the cursor */
793 if (global_cursor_default == -1)
794 global_cursor_default = 1;
795
796 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
797 vcs_make_sysfs(currcons);
798 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
799
800 return 0;
801err_free:
802 kfree(vc);
803 vc_cons[currcons].d = NULL;
804 return -ENOMEM;
805}
806
807static inline int resize_screen(struct vc_data *vc, int width, int height,
808 int user)
809{
810 /* Resizes the resolution of the display adapater */
811 int err = 0;
812
813 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
814 err = vc->vc_sw->con_resize(vc, width, height, user);
815
816 return err;
817}
818
819/*
820 * Change # of rows and columns (0 means unchanged/the size of fg_console)
821 * [this is to be used together with some user program
822 * like resize that changes the hardware videomode]
823 */
824#define VC_RESIZE_MAXCOL (32767)
825#define VC_RESIZE_MAXROW (32767)
826
827/**
828 * vc_do_resize - resizing method for the tty
829 * @tty: tty being resized
830 * @real_tty: real tty (different to tty if a pty/tty pair)
831 * @vc: virtual console private data
832 * @cols: columns
833 * @lines: lines
834 *
835 * Resize a virtual console, clipping according to the actual constraints.
836 * If the caller passes a tty structure then update the termios winsize
837 * information and perform any necessary signal handling.
838 *
839 * Caller must hold the console semaphore. Takes the termios rwsem and
840 * ctrl_lock of the tty IFF a tty is passed.
841 */
842
843static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
844 unsigned int cols, unsigned int lines)
845{
846 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
847 unsigned long end;
848 unsigned int old_rows, old_row_size;
849 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
850 unsigned int user;
851 unsigned short *newscreen;
852
853 WARN_CONSOLE_UNLOCKED();
854
855 if (!vc)
856 return -ENXIO;
857
858 user = vc->vc_resize_user;
859 vc->vc_resize_user = 0;
860
861 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
862 return -EINVAL;
863
864 new_cols = (cols ? cols : vc->vc_cols);
865 new_rows = (lines ? lines : vc->vc_rows);
866 new_row_size = new_cols << 1;
867 new_screen_size = new_row_size * new_rows;
868
869 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
870 return 0;
871
872 if (new_screen_size > (4 << 20))
873 return -EINVAL;
874 newscreen = kmalloc(new_screen_size, GFP_USER);
875 if (!newscreen)
876 return -ENOMEM;
877
878 if (vc == sel_cons)
879 clear_selection();
880
881 old_rows = vc->vc_rows;
882 old_row_size = vc->vc_size_row;
883
884 err = resize_screen(vc, new_cols, new_rows, user);
885 if (err) {
886 kfree(newscreen);
887 return err;
888 }
889
890 vc->vc_rows = new_rows;
891 vc->vc_cols = new_cols;
892 vc->vc_size_row = new_row_size;
893 vc->vc_screenbuf_size = new_screen_size;
894
895 rlth = min(old_row_size, new_row_size);
896 rrem = new_row_size - rlth;
897 old_origin = vc->vc_origin;
898 new_origin = (long) newscreen;
899 new_scr_end = new_origin + new_screen_size;
900
901 if (vc->vc_y > new_rows) {
902 if (old_rows - vc->vc_y < new_rows) {
903 /*
904 * Cursor near the bottom, copy contents from the
905 * bottom of buffer
906 */
907 old_origin += (old_rows - new_rows) * old_row_size;
908 } else {
909 /*
910 * Cursor is in no man's land, copy 1/2 screenful
911 * from the top and bottom of cursor position
912 */
913 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
914 }
915 }
916
917 end = old_origin + old_row_size * min(old_rows, new_rows);
918
919 update_attr(vc);
920
921 while (old_origin < end) {
922 scr_memcpyw((unsigned short *) new_origin,
923 (unsigned short *) old_origin, rlth);
924 if (rrem)
925 scr_memsetw((void *)(new_origin + rlth),
926 vc->vc_video_erase_char, rrem);
927 old_origin += old_row_size;
928 new_origin += new_row_size;
929 }
930 if (new_scr_end > new_origin)
931 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
932 new_scr_end - new_origin);
933 kfree(vc->vc_screenbuf);
934 vc->vc_screenbuf = newscreen;
935 vc->vc_screenbuf_size = new_screen_size;
936 set_origin(vc);
937
938 /* do part of a reset_terminal() */
939 vc->vc_top = 0;
940 vc->vc_bottom = vc->vc_rows;
941 gotoxy(vc, vc->vc_x, vc->vc_y);
942 save_cur(vc);
943
944 if (tty) {
945 /* Rewrite the requested winsize data with the actual
946 resulting sizes */
947 struct winsize ws;
948 memset(&ws, 0, sizeof(ws));
949 ws.ws_row = vc->vc_rows;
950 ws.ws_col = vc->vc_cols;
951 ws.ws_ypixel = vc->vc_scan_lines;
952 tty_do_resize(tty, &ws);
953 }
954
955 if (con_is_visible(vc))
956 update_screen(vc);
957 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
958 return err;
959}
960
961/**
962 * vc_resize - resize a VT
963 * @vc: virtual console
964 * @cols: columns
965 * @rows: rows
966 *
967 * Resize a virtual console as seen from the console end of things. We
968 * use the common vc_do_resize methods to update the structures. The
969 * caller must hold the console sem to protect console internals and
970 * vc->port.tty
971 */
972
973int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
974{
975 return vc_do_resize(vc->port.tty, vc, cols, rows);
976}
977
978/**
979 * vt_resize - resize a VT
980 * @tty: tty to resize
981 * @ws: winsize attributes
982 *
983 * Resize a virtual terminal. This is called by the tty layer as we
984 * register our own handler for resizing. The mutual helper does all
985 * the actual work.
986 *
987 * Takes the console sem and the called methods then take the tty
988 * termios_rwsem and the tty ctrl_lock in that order.
989 */
990static int vt_resize(struct tty_struct *tty, struct winsize *ws)
991{
992 struct vc_data *vc = tty->driver_data;
993 int ret;
994
995 console_lock();
996 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
997 console_unlock();
998 return ret;
999}
1000
1001struct vc_data *vc_deallocate(unsigned int currcons)
1002{
1003 struct vc_data *vc = NULL;
1004
1005 WARN_CONSOLE_UNLOCKED();
1006
1007 if (vc_cons_allocated(currcons)) {
1008 struct vt_notifier_param param;
1009
1010 param.vc = vc = vc_cons[currcons].d;
1011 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1012 vcs_remove_sysfs(currcons);
1013 vc->vc_sw->con_deinit(vc);
1014 put_pid(vc->vt_pid);
1015 module_put(vc->vc_sw->owner);
1016 kfree(vc->vc_screenbuf);
1017 vc_cons[currcons].d = NULL;
1018 }
1019 return vc;
1020}
1021
1022/*
1023 * VT102 emulator
1024 */
1025
1026#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1027#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1028#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1029
1030#define decarm VC_REPEAT
1031#define decckm VC_CKMODE
1032#define kbdapplic VC_APPLIC
1033#define lnm VC_CRLF
1034
1035/*
1036 * this is what the terminal answers to a ESC-Z or csi0c query.
1037 */
1038#define VT100ID "\033[?1;2c"
1039#define VT102ID "\033[?6c"
1040
1041const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1042 8,12,10,14, 9,13,11,15 };
1043
1044/* the default colour table, for VGA+ colour systems */
1045unsigned char default_red[] = {
1046 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1047 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1048};
1049module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1050
1051unsigned char default_grn[] = {
1052 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1053 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1054};
1055module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1056
1057unsigned char default_blu[] = {
1058 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1059 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1060};
1061module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1062
1063/*
1064 * gotoxy() must verify all boundaries, because the arguments
1065 * might also be negative. If the given position is out of
1066 * bounds, the cursor is placed at the nearest margin.
1067 */
1068static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1069{
1070 int min_y, max_y;
1071
1072 if (new_x < 0)
1073 vc->vc_x = 0;
1074 else {
1075 if (new_x >= vc->vc_cols)
1076 vc->vc_x = vc->vc_cols - 1;
1077 else
1078 vc->vc_x = new_x;
1079 }
1080
1081 if (vc->vc_decom) {
1082 min_y = vc->vc_top;
1083 max_y = vc->vc_bottom;
1084 } else {
1085 min_y = 0;
1086 max_y = vc->vc_rows;
1087 }
1088 if (new_y < min_y)
1089 vc->vc_y = min_y;
1090 else if (new_y >= max_y)
1091 vc->vc_y = max_y - 1;
1092 else
1093 vc->vc_y = new_y;
1094 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1095 vc->vc_need_wrap = 0;
1096}
1097
1098/* for absolute user moves, when decom is set */
1099static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1100{
1101 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1102}
1103
1104void scrollback(struct vc_data *vc)
1105{
1106 scrolldelta(-(vc->vc_rows / 2));
1107}
1108
1109void scrollfront(struct vc_data *vc, int lines)
1110{
1111 if (!lines)
1112 lines = vc->vc_rows / 2;
1113 scrolldelta(lines);
1114}
1115
1116static void lf(struct vc_data *vc)
1117{
1118 /* don't scroll if above bottom of scrolling region, or
1119 * if below scrolling region
1120 */
1121 if (vc->vc_y + 1 == vc->vc_bottom)
1122 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1123 else if (vc->vc_y < vc->vc_rows - 1) {
1124 vc->vc_y++;
1125 vc->vc_pos += vc->vc_size_row;
1126 }
1127 vc->vc_need_wrap = 0;
1128 notify_write(vc, '\n');
1129}
1130
1131static void ri(struct vc_data *vc)
1132{
1133 /* don't scroll if below top of scrolling region, or
1134 * if above scrolling region
1135 */
1136 if (vc->vc_y == vc->vc_top)
1137 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1138 else if (vc->vc_y > 0) {
1139 vc->vc_y--;
1140 vc->vc_pos -= vc->vc_size_row;
1141 }
1142 vc->vc_need_wrap = 0;
1143}
1144
1145static inline void cr(struct vc_data *vc)
1146{
1147 vc->vc_pos -= vc->vc_x << 1;
1148 vc->vc_need_wrap = vc->vc_x = 0;
1149 notify_write(vc, '\r');
1150}
1151
1152static inline void bs(struct vc_data *vc)
1153{
1154 if (vc->vc_x) {
1155 vc->vc_pos -= 2;
1156 vc->vc_x--;
1157 vc->vc_need_wrap = 0;
1158 notify_write(vc, '\b');
1159 }
1160}
1161
1162static inline void del(struct vc_data *vc)
1163{
1164 /* ignored */
1165}
1166
1167static void csi_J(struct vc_data *vc, int vpar)
1168{
1169 unsigned int count;
1170 unsigned short * start;
1171
1172 switch (vpar) {
1173 case 0: /* erase from cursor to end of display */
1174 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1175 start = (unsigned short *)vc->vc_pos;
1176 break;
1177 case 1: /* erase from start to cursor */
1178 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1179 start = (unsigned short *)vc->vc_origin;
1180 break;
1181 case 3: /* erase scroll-back buffer (and whole display) */
1182 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1183 vc->vc_screenbuf_size);
1184 flush_scrollback(vc);
1185 set_origin(vc);
1186 if (con_is_visible(vc))
1187 update_screen(vc);
1188 /* fall through */
1189 case 2: /* erase whole display */
1190 count = vc->vc_cols * vc->vc_rows;
1191 start = (unsigned short *)vc->vc_origin;
1192 break;
1193 default:
1194 return;
1195 }
1196 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1197 if (con_should_update(vc))
1198 do_update_region(vc, (unsigned long) start, count);
1199 vc->vc_need_wrap = 0;
1200}
1201
1202static void csi_K(struct vc_data *vc, int vpar)
1203{
1204 unsigned int count;
1205 unsigned short * start;
1206
1207 switch (vpar) {
1208 case 0: /* erase from cursor to end of line */
1209 count = vc->vc_cols - vc->vc_x;
1210 start = (unsigned short *)vc->vc_pos;
1211 break;
1212 case 1: /* erase from start of line to cursor */
1213 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1214 count = vc->vc_x + 1;
1215 break;
1216 case 2: /* erase whole line */
1217 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1218 count = vc->vc_cols;
1219 break;
1220 default:
1221 return;
1222 }
1223 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1224 vc->vc_need_wrap = 0;
1225 if (con_should_update(vc))
1226 do_update_region(vc, (unsigned long) start, count);
1227}
1228
1229static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1230{ /* not vt100? */
1231 int count;
1232
1233 if (!vpar)
1234 vpar++;
1235 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1236
1237 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1238 if (con_should_update(vc))
1239 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1240 vc->vc_need_wrap = 0;
1241}
1242
1243static void default_attr(struct vc_data *vc)
1244{
1245 vc->vc_intensity = 1;
1246 vc->vc_italic = 0;
1247 vc->vc_underline = 0;
1248 vc->vc_reverse = 0;
1249 vc->vc_blink = 0;
1250 vc->vc_color = vc->vc_def_color;
1251}
1252
1253struct rgb { u8 r; u8 g; u8 b; };
1254
1255static void rgb_from_256(int i, struct rgb *c)
1256{
1257 if (i < 8) { /* Standard colours. */
1258 c->r = i&1 ? 0xaa : 0x00;
1259 c->g = i&2 ? 0xaa : 0x00;
1260 c->b = i&4 ? 0xaa : 0x00;
1261 } else if (i < 16) {
1262 c->r = i&1 ? 0xff : 0x55;
1263 c->g = i&2 ? 0xff : 0x55;
1264 c->b = i&4 ? 0xff : 0x55;
1265 } else if (i < 232) { /* 6x6x6 colour cube. */
1266 c->r = (i - 16) / 36 * 85 / 2;
1267 c->g = (i - 16) / 6 % 6 * 85 / 2;
1268 c->b = (i - 16) % 6 * 85 / 2;
1269 } else /* Grayscale ramp. */
1270 c->r = c->g = c->b = i * 10 - 2312;
1271}
1272
1273static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1274{
1275 u8 hue = 0, max = max3(c->r, c->g, c->b);
1276
1277 if (c->r > max / 2)
1278 hue |= 4;
1279 if (c->g > max / 2)
1280 hue |= 2;
1281 if (c->b > max / 2)
1282 hue |= 1;
1283
1284 if (hue == 7 && max <= 0x55) {
1285 hue = 0;
1286 vc->vc_intensity = 2;
1287 } else if (max > 0xaa)
1288 vc->vc_intensity = 2;
1289 else
1290 vc->vc_intensity = 1;
1291
1292 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1293}
1294
1295static void rgb_background(struct vc_data *vc, const struct rgb *c)
1296{
1297 /* For backgrounds, err on the dark side. */
1298 vc->vc_color = (vc->vc_color & 0x0f)
1299 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1300}
1301
1302/*
1303 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1304 * and thus need to be detected and ignored by hand. Strictly speaking, that
1305 * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1306 * no one produces such codes and almost no one accepts them.
1307 *
1308 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1309 * supporting them.
1310 */
1311static int vc_t416_color(struct vc_data *vc, int i,
1312 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1313{
1314 struct rgb c;
1315
1316 i++;
1317 if (i > vc->vc_npar)
1318 return i;
1319
1320 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1321 /* 256 colours */
1322 i++;
1323 rgb_from_256(vc->vc_par[i], &c);
1324 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1325 /* 24 bit */
1326 c.r = vc->vc_par[i + 1];
1327 c.g = vc->vc_par[i + 2];
1328 c.b = vc->vc_par[i + 3];
1329 i += 3;
1330 } else
1331 return i;
1332
1333 set_color(vc, &c);
1334
1335 return i;
1336}
1337
1338/* console_lock is held */
1339static void csi_m(struct vc_data *vc)
1340{
1341 int i;
1342
1343 for (i = 0; i <= vc->vc_npar; i++)
1344 switch (vc->vc_par[i]) {
1345 case 0: /* all attributes off */
1346 default_attr(vc);
1347 break;
1348 case 1:
1349 vc->vc_intensity = 2;
1350 break;
1351 case 2:
1352 vc->vc_intensity = 0;
1353 break;
1354 case 3:
1355 vc->vc_italic = 1;
1356 break;
1357 case 21:
1358 /*
1359 * No console drivers support double underline, so
1360 * convert it to a single underline.
1361 */
1362 case 4:
1363 vc->vc_underline = 1;
1364 break;
1365 case 5:
1366 vc->vc_blink = 1;
1367 break;
1368 case 7:
1369 vc->vc_reverse = 1;
1370 break;
1371 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1372 * Select primary font, don't display control chars if
1373 * defined, don't set bit 8 on output.
1374 */
1375 vc->vc_translate = set_translate(vc->vc_charset == 0
1376 ? vc->vc_G0_charset
1377 : vc->vc_G1_charset, vc);
1378 vc->vc_disp_ctrl = 0;
1379 vc->vc_toggle_meta = 0;
1380 break;
1381 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1382 * Select first alternate font, lets chars < 32 be
1383 * displayed as ROM chars.
1384 */
1385 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1386 vc->vc_disp_ctrl = 1;
1387 vc->vc_toggle_meta = 0;
1388 break;
1389 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1390 * Select second alternate font, toggle high bit
1391 * before displaying as ROM char.
1392 */
1393 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1394 vc->vc_disp_ctrl = 1;
1395 vc->vc_toggle_meta = 1;
1396 break;
1397 case 22:
1398 vc->vc_intensity = 1;
1399 break;
1400 case 23:
1401 vc->vc_italic = 0;
1402 break;
1403 case 24:
1404 vc->vc_underline = 0;
1405 break;
1406 case 25:
1407 vc->vc_blink = 0;
1408 break;
1409 case 27:
1410 vc->vc_reverse = 0;
1411 break;
1412 case 38:
1413 i = vc_t416_color(vc, i, rgb_foreground);
1414 break;
1415 case 48:
1416 i = vc_t416_color(vc, i, rgb_background);
1417 break;
1418 case 39:
1419 vc->vc_color = (vc->vc_def_color & 0x0f) |
1420 (vc->vc_color & 0xf0);
1421 break;
1422 case 49:
1423 vc->vc_color = (vc->vc_def_color & 0xf0) |
1424 (vc->vc_color & 0x0f);
1425 break;
1426 default:
1427 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1428 if (vc->vc_par[i] < 100)
1429 vc->vc_intensity = 2;
1430 vc->vc_par[i] -= 60;
1431 }
1432 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1433 vc->vc_color = color_table[vc->vc_par[i] - 30]
1434 | (vc->vc_color & 0xf0);
1435 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1436 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1437 | (vc->vc_color & 0x0f);
1438 break;
1439 }
1440 update_attr(vc);
1441}
1442
1443static void respond_string(const char *p, struct tty_port *port)
1444{
1445 while (*p) {
1446 tty_insert_flip_char(port, *p, 0);
1447 p++;
1448 }
1449 tty_schedule_flip(port);
1450}
1451
1452static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1453{
1454 char buf[40];
1455
1456 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1457 respond_string(buf, tty->port);
1458}
1459
1460static inline void status_report(struct tty_struct *tty)
1461{
1462 respond_string("\033[0n", tty->port); /* Terminal ok */
1463}
1464
1465static inline void respond_ID(struct tty_struct *tty)
1466{
1467 respond_string(VT102ID, tty->port);
1468}
1469
1470void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1471{
1472 char buf[8];
1473
1474 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1475 (char)('!' + mry));
1476 respond_string(buf, tty->port);
1477}
1478
1479/* invoked via ioctl(TIOCLINUX) and through set_selection */
1480int mouse_reporting(void)
1481{
1482 return vc_cons[fg_console].d->vc_report_mouse;
1483}
1484
1485/* console_lock is held */
1486static void set_mode(struct vc_data *vc, int on_off)
1487{
1488 int i;
1489
1490 for (i = 0; i <= vc->vc_npar; i++)
1491 if (vc->vc_ques) {
1492 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1493 case 1: /* Cursor keys send ^[Ox/^[[x */
1494 if (on_off)
1495 set_kbd(vc, decckm);
1496 else
1497 clr_kbd(vc, decckm);
1498 break;
1499 case 3: /* 80/132 mode switch unimplemented */
1500#if 0
1501 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1502 /* this alone does not suffice; some user mode
1503 utility has to change the hardware regs */
1504#endif
1505 break;
1506 case 5: /* Inverted screen on/off */
1507 if (vc->vc_decscnm != on_off) {
1508 vc->vc_decscnm = on_off;
1509 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1510 update_attr(vc);
1511 }
1512 break;
1513 case 6: /* Origin relative/absolute */
1514 vc->vc_decom = on_off;
1515 gotoxay(vc, 0, 0);
1516 break;
1517 case 7: /* Autowrap on/off */
1518 vc->vc_decawm = on_off;
1519 break;
1520 case 8: /* Autorepeat on/off */
1521 if (on_off)
1522 set_kbd(vc, decarm);
1523 else
1524 clr_kbd(vc, decarm);
1525 break;
1526 case 9:
1527 vc->vc_report_mouse = on_off ? 1 : 0;
1528 break;
1529 case 25: /* Cursor on/off */
1530 vc->vc_deccm = on_off;
1531 break;
1532 case 1000:
1533 vc->vc_report_mouse = on_off ? 2 : 0;
1534 break;
1535 }
1536 } else {
1537 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1538 case 3: /* Monitor (display ctrls) */
1539 vc->vc_disp_ctrl = on_off;
1540 break;
1541 case 4: /* Insert Mode on/off */
1542 vc->vc_decim = on_off;
1543 break;
1544 case 20: /* Lf, Enter == CrLf/Lf */
1545 if (on_off)
1546 set_kbd(vc, lnm);
1547 else
1548 clr_kbd(vc, lnm);
1549 break;
1550 }
1551 }
1552}
1553
1554/* console_lock is held */
1555static void setterm_command(struct vc_data *vc)
1556{
1557 switch(vc->vc_par[0]) {
1558 case 1: /* set color for underline mode */
1559 if (vc->vc_can_do_color &&
1560 vc->vc_par[1] < 16) {
1561 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1562 if (vc->vc_underline)
1563 update_attr(vc);
1564 }
1565 break;
1566 case 2: /* set color for half intensity mode */
1567 if (vc->vc_can_do_color &&
1568 vc->vc_par[1] < 16) {
1569 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1570 if (vc->vc_intensity == 0)
1571 update_attr(vc);
1572 }
1573 break;
1574 case 8: /* store colors as defaults */
1575 vc->vc_def_color = vc->vc_attr;
1576 if (vc->vc_hi_font_mask == 0x100)
1577 vc->vc_def_color >>= 1;
1578 default_attr(vc);
1579 update_attr(vc);
1580 break;
1581 case 9: /* set blanking interval */
1582 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1583 poke_blanked_console();
1584 break;
1585 case 10: /* set bell frequency in Hz */
1586 if (vc->vc_npar >= 1)
1587 vc->vc_bell_pitch = vc->vc_par[1];
1588 else
1589 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1590 break;
1591 case 11: /* set bell duration in msec */
1592 if (vc->vc_npar >= 1)
1593 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1594 msecs_to_jiffies(vc->vc_par[1]) : 0;
1595 else
1596 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1597 break;
1598 case 12: /* bring specified console to the front */
1599 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1600 set_console(vc->vc_par[1] - 1);
1601 break;
1602 case 13: /* unblank the screen */
1603 poke_blanked_console();
1604 break;
1605 case 14: /* set vesa powerdown interval */
1606 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1607 break;
1608 case 15: /* activate the previous console */
1609 set_console(last_console);
1610 break;
1611 case 16: /* set cursor blink duration in msec */
1612 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1613 vc->vc_par[1] <= USHRT_MAX)
1614 vc->vc_cur_blink_ms = vc->vc_par[1];
1615 else
1616 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1617 break;
1618 }
1619}
1620
1621/* console_lock is held */
1622static void csi_at(struct vc_data *vc, unsigned int nr)
1623{
1624 if (nr > vc->vc_cols - vc->vc_x)
1625 nr = vc->vc_cols - vc->vc_x;
1626 else if (!nr)
1627 nr = 1;
1628 insert_char(vc, nr);
1629}
1630
1631/* console_lock is held */
1632static void csi_L(struct vc_data *vc, unsigned int nr)
1633{
1634 if (nr > vc->vc_rows - vc->vc_y)
1635 nr = vc->vc_rows - vc->vc_y;
1636 else if (!nr)
1637 nr = 1;
1638 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1639 vc->vc_need_wrap = 0;
1640}
1641
1642/* console_lock is held */
1643static void csi_P(struct vc_data *vc, unsigned int nr)
1644{
1645 if (nr > vc->vc_cols - vc->vc_x)
1646 nr = vc->vc_cols - vc->vc_x;
1647 else if (!nr)
1648 nr = 1;
1649 delete_char(vc, nr);
1650}
1651
1652/* console_lock is held */
1653static void csi_M(struct vc_data *vc, unsigned int nr)
1654{
1655 if (nr > vc->vc_rows - vc->vc_y)
1656 nr = vc->vc_rows - vc->vc_y;
1657 else if (!nr)
1658 nr=1;
1659 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1660 vc->vc_need_wrap = 0;
1661}
1662
1663/* console_lock is held (except via vc_init->reset_terminal */
1664static void save_cur(struct vc_data *vc)
1665{
1666 vc->vc_saved_x = vc->vc_x;
1667 vc->vc_saved_y = vc->vc_y;
1668 vc->vc_s_intensity = vc->vc_intensity;
1669 vc->vc_s_italic = vc->vc_italic;
1670 vc->vc_s_underline = vc->vc_underline;
1671 vc->vc_s_blink = vc->vc_blink;
1672 vc->vc_s_reverse = vc->vc_reverse;
1673 vc->vc_s_charset = vc->vc_charset;
1674 vc->vc_s_color = vc->vc_color;
1675 vc->vc_saved_G0 = vc->vc_G0_charset;
1676 vc->vc_saved_G1 = vc->vc_G1_charset;
1677}
1678
1679/* console_lock is held */
1680static void restore_cur(struct vc_data *vc)
1681{
1682 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1683 vc->vc_intensity = vc->vc_s_intensity;
1684 vc->vc_italic = vc->vc_s_italic;
1685 vc->vc_underline = vc->vc_s_underline;
1686 vc->vc_blink = vc->vc_s_blink;
1687 vc->vc_reverse = vc->vc_s_reverse;
1688 vc->vc_charset = vc->vc_s_charset;
1689 vc->vc_color = vc->vc_s_color;
1690 vc->vc_G0_charset = vc->vc_saved_G0;
1691 vc->vc_G1_charset = vc->vc_saved_G1;
1692 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1693 update_attr(vc);
1694 vc->vc_need_wrap = 0;
1695}
1696
1697enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1698 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1699 ESpalette, ESosc };
1700
1701/* console_lock is held (except via vc_init()) */
1702static void reset_terminal(struct vc_data *vc, int do_clear)
1703{
1704 vc->vc_top = 0;
1705 vc->vc_bottom = vc->vc_rows;
1706 vc->vc_state = ESnormal;
1707 vc->vc_ques = 0;
1708 vc->vc_translate = set_translate(LAT1_MAP, vc);
1709 vc->vc_G0_charset = LAT1_MAP;
1710 vc->vc_G1_charset = GRAF_MAP;
1711 vc->vc_charset = 0;
1712 vc->vc_need_wrap = 0;
1713 vc->vc_report_mouse = 0;
1714 vc->vc_utf = default_utf8;
1715 vc->vc_utf_count = 0;
1716
1717 vc->vc_disp_ctrl = 0;
1718 vc->vc_toggle_meta = 0;
1719
1720 vc->vc_decscnm = 0;
1721 vc->vc_decom = 0;
1722 vc->vc_decawm = 1;
1723 vc->vc_deccm = global_cursor_default;
1724 vc->vc_decim = 0;
1725
1726 vt_reset_keyboard(vc->vc_num);
1727
1728 vc->vc_cursor_type = cur_default;
1729 vc->vc_complement_mask = vc->vc_s_complement_mask;
1730
1731 default_attr(vc);
1732 update_attr(vc);
1733
1734 vc->vc_tab_stop[0] =
1735 vc->vc_tab_stop[1] =
1736 vc->vc_tab_stop[2] =
1737 vc->vc_tab_stop[3] =
1738 vc->vc_tab_stop[4] =
1739 vc->vc_tab_stop[5] =
1740 vc->vc_tab_stop[6] =
1741 vc->vc_tab_stop[7] = 0x01010101;
1742
1743 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1744 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1745 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1746
1747 gotoxy(vc, 0, 0);
1748 save_cur(vc);
1749 if (do_clear)
1750 csi_J(vc, 2);
1751}
1752
1753/* console_lock is held */
1754static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1755{
1756 /*
1757 * Control characters can be used in the _middle_
1758 * of an escape sequence.
1759 */
1760 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1761 return;
1762 switch (c) {
1763 case 0:
1764 return;
1765 case 7:
1766 if (vc->vc_state == ESosc)
1767 vc->vc_state = ESnormal;
1768 else if (vc->vc_bell_duration)
1769 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1770 return;
1771 case 8:
1772 bs(vc);
1773 return;
1774 case 9:
1775 vc->vc_pos -= (vc->vc_x << 1);
1776 while (vc->vc_x < vc->vc_cols - 1) {
1777 vc->vc_x++;
1778 if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
1779 break;
1780 }
1781 vc->vc_pos += (vc->vc_x << 1);
1782 notify_write(vc, '\t');
1783 return;
1784 case 10: case 11: case 12:
1785 lf(vc);
1786 if (!is_kbd(vc, lnm))
1787 return;
1788 case 13:
1789 cr(vc);
1790 return;
1791 case 14:
1792 vc->vc_charset = 1;
1793 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1794 vc->vc_disp_ctrl = 1;
1795 return;
1796 case 15:
1797 vc->vc_charset = 0;
1798 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1799 vc->vc_disp_ctrl = 0;
1800 return;
1801 case 24: case 26:
1802 vc->vc_state = ESnormal;
1803 return;
1804 case 27:
1805 vc->vc_state = ESesc;
1806 return;
1807 case 127:
1808 del(vc);
1809 return;
1810 case 128+27:
1811 vc->vc_state = ESsquare;
1812 return;
1813 }
1814 switch(vc->vc_state) {
1815 case ESesc:
1816 vc->vc_state = ESnormal;
1817 switch (c) {
1818 case '[':
1819 vc->vc_state = ESsquare;
1820 return;
1821 case ']':
1822 vc->vc_state = ESnonstd;
1823 return;
1824 case '%':
1825 vc->vc_state = ESpercent;
1826 return;
1827 case 'E':
1828 cr(vc);
1829 lf(vc);
1830 return;
1831 case 'M':
1832 ri(vc);
1833 return;
1834 case 'D':
1835 lf(vc);
1836 return;
1837 case 'H':
1838 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
1839 return;
1840 case 'Z':
1841 respond_ID(tty);
1842 return;
1843 case '7':
1844 save_cur(vc);
1845 return;
1846 case '8':
1847 restore_cur(vc);
1848 return;
1849 case '(':
1850 vc->vc_state = ESsetG0;
1851 return;
1852 case ')':
1853 vc->vc_state = ESsetG1;
1854 return;
1855 case '#':
1856 vc->vc_state = EShash;
1857 return;
1858 case 'c':
1859 reset_terminal(vc, 1);
1860 return;
1861 case '>': /* Numeric keypad */
1862 clr_kbd(vc, kbdapplic);
1863 return;
1864 case '=': /* Appl. keypad */
1865 set_kbd(vc, kbdapplic);
1866 return;
1867 }
1868 return;
1869 case ESnonstd:
1870 if (c=='P') { /* palette escape sequence */
1871 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1872 vc->vc_par[vc->vc_npar] = 0;
1873 vc->vc_npar = 0;
1874 vc->vc_state = ESpalette;
1875 return;
1876 } else if (c=='R') { /* reset palette */
1877 reset_palette(vc);
1878 vc->vc_state = ESnormal;
1879 } else if (c>='0' && c<='9')
1880 vc->vc_state = ESosc;
1881 else
1882 vc->vc_state = ESnormal;
1883 return;
1884 case ESpalette:
1885 if (isxdigit(c)) {
1886 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1887 if (vc->vc_npar == 7) {
1888 int i = vc->vc_par[0] * 3, j = 1;
1889 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1890 vc->vc_palette[i++] += vc->vc_par[j++];
1891 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1892 vc->vc_palette[i++] += vc->vc_par[j++];
1893 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1894 vc->vc_palette[i] += vc->vc_par[j];
1895 set_palette(vc);
1896 vc->vc_state = ESnormal;
1897 }
1898 } else
1899 vc->vc_state = ESnormal;
1900 return;
1901 case ESsquare:
1902 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1903 vc->vc_par[vc->vc_npar] = 0;
1904 vc->vc_npar = 0;
1905 vc->vc_state = ESgetpars;
1906 if (c == '[') { /* Function key */
1907 vc->vc_state=ESfunckey;
1908 return;
1909 }
1910 vc->vc_ques = (c == '?');
1911 if (vc->vc_ques)
1912 return;
1913 case ESgetpars:
1914 if (c == ';' && vc->vc_npar < NPAR - 1) {
1915 vc->vc_npar++;
1916 return;
1917 } else if (c>='0' && c<='9') {
1918 vc->vc_par[vc->vc_npar] *= 10;
1919 vc->vc_par[vc->vc_npar] += c - '0';
1920 return;
1921 }
1922 vc->vc_state = ESnormal;
1923 switch(c) {
1924 case 'h':
1925 set_mode(vc, 1);
1926 return;
1927 case 'l':
1928 set_mode(vc, 0);
1929 return;
1930 case 'c':
1931 if (vc->vc_ques) {
1932 if (vc->vc_par[0])
1933 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1934 else
1935 vc->vc_cursor_type = cur_default;
1936 return;
1937 }
1938 break;
1939 case 'm':
1940 if (vc->vc_ques) {
1941 clear_selection();
1942 if (vc->vc_par[0])
1943 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1944 else
1945 vc->vc_complement_mask = vc->vc_s_complement_mask;
1946 return;
1947 }
1948 break;
1949 case 'n':
1950 if (!vc->vc_ques) {
1951 if (vc->vc_par[0] == 5)
1952 status_report(tty);
1953 else if (vc->vc_par[0] == 6)
1954 cursor_report(vc, tty);
1955 }
1956 return;
1957 }
1958 if (vc->vc_ques) {
1959 vc->vc_ques = 0;
1960 return;
1961 }
1962 switch(c) {
1963 case 'G': case '`':
1964 if (vc->vc_par[0])
1965 vc->vc_par[0]--;
1966 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1967 return;
1968 case 'A':
1969 if (!vc->vc_par[0])
1970 vc->vc_par[0]++;
1971 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1972 return;
1973 case 'B': case 'e':
1974 if (!vc->vc_par[0])
1975 vc->vc_par[0]++;
1976 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1977 return;
1978 case 'C': case 'a':
1979 if (!vc->vc_par[0])
1980 vc->vc_par[0]++;
1981 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1982 return;
1983 case 'D':
1984 if (!vc->vc_par[0])
1985 vc->vc_par[0]++;
1986 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1987 return;
1988 case 'E':
1989 if (!vc->vc_par[0])
1990 vc->vc_par[0]++;
1991 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1992 return;
1993 case 'F':
1994 if (!vc->vc_par[0])
1995 vc->vc_par[0]++;
1996 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1997 return;
1998 case 'd':
1999 if (vc->vc_par[0])
2000 vc->vc_par[0]--;
2001 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2002 return;
2003 case 'H': case 'f':
2004 if (vc->vc_par[0])
2005 vc->vc_par[0]--;
2006 if (vc->vc_par[1])
2007 vc->vc_par[1]--;
2008 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2009 return;
2010 case 'J':
2011 csi_J(vc, vc->vc_par[0]);
2012 return;
2013 case 'K':
2014 csi_K(vc, vc->vc_par[0]);
2015 return;
2016 case 'L':
2017 csi_L(vc, vc->vc_par[0]);
2018 return;
2019 case 'M':
2020 csi_M(vc, vc->vc_par[0]);
2021 return;
2022 case 'P':
2023 csi_P(vc, vc->vc_par[0]);
2024 return;
2025 case 'c':
2026 if (!vc->vc_par[0])
2027 respond_ID(tty);
2028 return;
2029 case 'g':
2030 if (!vc->vc_par[0])
2031 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2032 else if (vc->vc_par[0] == 3) {
2033 vc->vc_tab_stop[0] =
2034 vc->vc_tab_stop[1] =
2035 vc->vc_tab_stop[2] =
2036 vc->vc_tab_stop[3] =
2037 vc->vc_tab_stop[4] =
2038 vc->vc_tab_stop[5] =
2039 vc->vc_tab_stop[6] =
2040 vc->vc_tab_stop[7] = 0;
2041 }
2042 return;
2043 case 'm':
2044 csi_m(vc);
2045 return;
2046 case 'q': /* DECLL - but only 3 leds */
2047 /* map 0,1,2,3 to 0,1,2,4 */
2048 if (vc->vc_par[0] < 4)
2049 vt_set_led_state(vc->vc_num,
2050 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2051 return;
2052 case 'r':
2053 if (!vc->vc_par[0])
2054 vc->vc_par[0]++;
2055 if (!vc->vc_par[1])
2056 vc->vc_par[1] = vc->vc_rows;
2057 /* Minimum allowed region is 2 lines */
2058 if (vc->vc_par[0] < vc->vc_par[1] &&
2059 vc->vc_par[1] <= vc->vc_rows) {
2060 vc->vc_top = vc->vc_par[0] - 1;
2061 vc->vc_bottom = vc->vc_par[1];
2062 gotoxay(vc, 0, 0);
2063 }
2064 return;
2065 case 's':
2066 save_cur(vc);
2067 return;
2068 case 'u':
2069 restore_cur(vc);
2070 return;
2071 case 'X':
2072 csi_X(vc, vc->vc_par[0]);
2073 return;
2074 case '@':
2075 csi_at(vc, vc->vc_par[0]);
2076 return;
2077 case ']': /* setterm functions */
2078 setterm_command(vc);
2079 return;
2080 }
2081 return;
2082 case ESpercent:
2083 vc->vc_state = ESnormal;
2084 switch (c) {
2085 case '@': /* defined in ISO 2022 */
2086 vc->vc_utf = 0;
2087 return;
2088 case 'G': /* prelim official escape code */
2089 case '8': /* retained for compatibility */
2090 vc->vc_utf = 1;
2091 return;
2092 }
2093 return;
2094 case ESfunckey:
2095 vc->vc_state = ESnormal;
2096 return;
2097 case EShash:
2098 vc->vc_state = ESnormal;
2099 if (c == '8') {
2100 /* DEC screen alignment test. kludge :-) */
2101 vc->vc_video_erase_char =
2102 (vc->vc_video_erase_char & 0xff00) | 'E';
2103 csi_J(vc, 2);
2104 vc->vc_video_erase_char =
2105 (vc->vc_video_erase_char & 0xff00) | ' ';
2106 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2107 }
2108 return;
2109 case ESsetG0:
2110 if (c == '0')
2111 vc->vc_G0_charset = GRAF_MAP;
2112 else if (c == 'B')
2113 vc->vc_G0_charset = LAT1_MAP;
2114 else if (c == 'U')
2115 vc->vc_G0_charset = IBMPC_MAP;
2116 else if (c == 'K')
2117 vc->vc_G0_charset = USER_MAP;
2118 if (vc->vc_charset == 0)
2119 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2120 vc->vc_state = ESnormal;
2121 return;
2122 case ESsetG1:
2123 if (c == '0')
2124 vc->vc_G1_charset = GRAF_MAP;
2125 else if (c == 'B')
2126 vc->vc_G1_charset = LAT1_MAP;
2127 else if (c == 'U')
2128 vc->vc_G1_charset = IBMPC_MAP;
2129 else if (c == 'K')
2130 vc->vc_G1_charset = USER_MAP;
2131 if (vc->vc_charset == 1)
2132 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2133 vc->vc_state = ESnormal;
2134 return;
2135 case ESosc:
2136 return;
2137 default:
2138 vc->vc_state = ESnormal;
2139 }
2140}
2141
2142/* is_double_width() is based on the wcwidth() implementation by
2143 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2144 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2145 */
2146struct interval {
2147 uint32_t first;
2148 uint32_t last;
2149};
2150
2151static int ucs_cmp(const void *key, const void *elt)
2152{
2153 uint32_t ucs = *(uint32_t *)key;
2154 struct interval e = *(struct interval *) elt;
2155
2156 if (ucs > e.last)
2157 return 1;
2158 else if (ucs < e.first)
2159 return -1;
2160 return 0;
2161}
2162
2163static int is_double_width(uint32_t ucs)
2164{
2165 static const struct interval double_width[] = {
2166 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2167 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2168 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2169 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2170 };
2171 if (ucs < double_width[0].first ||
2172 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2173 return 0;
2174
2175 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2176 sizeof(struct interval), ucs_cmp) != NULL;
2177}
2178
2179static void con_flush(struct vc_data *vc, unsigned long draw_from,
2180 unsigned long draw_to, int *draw_x)
2181{
2182 if (*draw_x < 0)
2183 return;
2184
2185 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2186 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2187 *draw_x = -1;
2188}
2189
2190/* acquires console_lock */
2191static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2192{
2193 int c, tc, ok, n = 0, draw_x = -1;
2194 unsigned int currcons;
2195 unsigned long draw_from = 0, draw_to = 0;
2196 struct vc_data *vc;
2197 unsigned char vc_attr;
2198 struct vt_notifier_param param;
2199 uint8_t rescan;
2200 uint8_t inverse;
2201 uint8_t width;
2202 u16 himask, charmask;
2203
2204 if (in_interrupt())
2205 return count;
2206
2207 might_sleep();
2208
2209 console_lock();
2210 vc = tty->driver_data;
2211 if (vc == NULL) {
2212 pr_err("vt: argh, driver_data is NULL !\n");
2213 console_unlock();
2214 return 0;
2215 }
2216
2217 currcons = vc->vc_num;
2218 if (!vc_cons_allocated(currcons)) {
2219 /* could this happen? */
2220 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2221 console_unlock();
2222 return 0;
2223 }
2224
2225 himask = vc->vc_hi_font_mask;
2226 charmask = himask ? 0x1ff : 0xff;
2227
2228 /* undraw cursor first */
2229 if (con_is_fg(vc))
2230 hide_cursor(vc);
2231
2232 param.vc = vc;
2233
2234 while (!tty->stopped && count) {
2235 int orig = *buf;
2236 c = orig;
2237 buf++;
2238 n++;
2239 count--;
2240 rescan = 0;
2241 inverse = 0;
2242 width = 1;
2243
2244 /* Do no translation at all in control states */
2245 if (vc->vc_state != ESnormal) {
2246 tc = c;
2247 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2248 /* Combine UTF-8 into Unicode in vc_utf_char.
2249 * vc_utf_count is the number of continuation bytes still
2250 * expected to arrive.
2251 * vc_npar is the number of continuation bytes arrived so
2252 * far
2253 */
2254rescan_last_byte:
2255 if ((c & 0xc0) == 0x80) {
2256 /* Continuation byte received */
2257 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2258 if (vc->vc_utf_count) {
2259 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2260 vc->vc_npar++;
2261 if (--vc->vc_utf_count) {
2262 /* Still need some bytes */
2263 continue;
2264 }
2265 /* Got a whole character */
2266 c = vc->vc_utf_char;
2267 /* Reject overlong sequences */
2268 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2269 c > utf8_length_changes[vc->vc_npar])
2270 c = 0xfffd;
2271 } else {
2272 /* Unexpected continuation byte */
2273 vc->vc_utf_count = 0;
2274 c = 0xfffd;
2275 }
2276 } else {
2277 /* Single ASCII byte or first byte of a sequence received */
2278 if (vc->vc_utf_count) {
2279 /* Continuation byte expected */
2280 rescan = 1;
2281 vc->vc_utf_count = 0;
2282 c = 0xfffd;
2283 } else if (c > 0x7f) {
2284 /* First byte of a multibyte sequence received */
2285 vc->vc_npar = 0;
2286 if ((c & 0xe0) == 0xc0) {
2287 vc->vc_utf_count = 1;
2288 vc->vc_utf_char = (c & 0x1f);
2289 } else if ((c & 0xf0) == 0xe0) {
2290 vc->vc_utf_count = 2;
2291 vc->vc_utf_char = (c & 0x0f);
2292 } else if ((c & 0xf8) == 0xf0) {
2293 vc->vc_utf_count = 3;
2294 vc->vc_utf_char = (c & 0x07);
2295 } else if ((c & 0xfc) == 0xf8) {
2296 vc->vc_utf_count = 4;
2297 vc->vc_utf_char = (c & 0x03);
2298 } else if ((c & 0xfe) == 0xfc) {
2299 vc->vc_utf_count = 5;
2300 vc->vc_utf_char = (c & 0x01);
2301 } else {
2302 /* 254 and 255 are invalid */
2303 c = 0xfffd;
2304 }
2305 if (vc->vc_utf_count) {
2306 /* Still need some bytes */
2307 continue;
2308 }
2309 }
2310 /* Nothing to do if an ASCII byte was received */
2311 }
2312 /* End of UTF-8 decoding. */
2313 /* c is the received character, or U+FFFD for invalid sequences. */
2314 /* Replace invalid Unicode code points with U+FFFD too */
2315 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2316 c = 0xfffd;
2317 tc = c;
2318 } else { /* no utf or alternate charset mode */
2319 tc = vc_translate(vc, c);
2320 }
2321
2322 param.c = tc;
2323 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2324 ¶m) == NOTIFY_STOP)
2325 continue;
2326
2327 /* If the original code was a control character we
2328 * only allow a glyph to be displayed if the code is
2329 * not normally used (such as for cursor movement) or
2330 * if the disp_ctrl mode has been explicitly enabled.
2331 * Certain characters (as given by the CTRL_ALWAYS
2332 * bitmap) are always displayed as control characters,
2333 * as the console would be pretty useless without
2334 * them; to display an arbitrary font position use the
2335 * direct-to-font zone in UTF-8 mode.
2336 */
2337 ok = tc && (c >= 32 ||
2338 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2339 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2340 && (c != 127 || vc->vc_disp_ctrl)
2341 && (c != 128+27);
2342
2343 if (vc->vc_state == ESnormal && ok) {
2344 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2345 if (is_double_width(c))
2346 width = 2;
2347 }
2348 /* Now try to find out how to display it */
2349 tc = conv_uni_to_pc(vc, tc);
2350 if (tc & ~charmask) {
2351 if (tc == -1 || tc == -2) {
2352 continue; /* nothing to display */
2353 }
2354 /* Glyph not found */
2355 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2356 /* In legacy mode use the glyph we get by a 1:1 mapping.
2357 This would make absolutely no sense with Unicode in mind,
2358 but do this for ASCII characters since a font may lack
2359 Unicode mapping info and we don't want to end up with
2360 having question marks only. */
2361 tc = c;
2362 } else {
2363 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2364 tc = conv_uni_to_pc(vc, 0xfffd);
2365 if (tc < 0) {
2366 inverse = 1;
2367 tc = conv_uni_to_pc(vc, '?');
2368 if (tc < 0) tc = '?';
2369 }
2370 }
2371 }
2372
2373 if (!inverse) {
2374 vc_attr = vc->vc_attr;
2375 } else {
2376 /* invert vc_attr */
2377 if (!vc->vc_can_do_color) {
2378 vc_attr = (vc->vc_attr) ^ 0x08;
2379 } else if (vc->vc_hi_font_mask == 0x100) {
2380 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2381 } else {
2382 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2383 }
2384 con_flush(vc, draw_from, draw_to, &draw_x);
2385 }
2386
2387 while (1) {
2388 if (vc->vc_need_wrap || vc->vc_decim)
2389 con_flush(vc, draw_from, draw_to,
2390 &draw_x);
2391 if (vc->vc_need_wrap) {
2392 cr(vc);
2393 lf(vc);
2394 }
2395 if (vc->vc_decim)
2396 insert_char(vc, 1);
2397 scr_writew(himask ?
2398 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2399 (vc_attr << 8) + tc,
2400 (u16 *) vc->vc_pos);
2401 if (con_should_update(vc) && draw_x < 0) {
2402 draw_x = vc->vc_x;
2403 draw_from = vc->vc_pos;
2404 }
2405 if (vc->vc_x == vc->vc_cols - 1) {
2406 vc->vc_need_wrap = vc->vc_decawm;
2407 draw_to = vc->vc_pos + 2;
2408 } else {
2409 vc->vc_x++;
2410 draw_to = (vc->vc_pos += 2);
2411 }
2412
2413 if (!--width) break;
2414
2415 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2416 if (tc < 0) tc = ' ';
2417 }
2418 notify_write(vc, c);
2419
2420 if (inverse)
2421 con_flush(vc, draw_from, draw_to, &draw_x);
2422
2423 if (rescan) {
2424 rescan = 0;
2425 inverse = 0;
2426 width = 1;
2427 c = orig;
2428 goto rescan_last_byte;
2429 }
2430 continue;
2431 }
2432 con_flush(vc, draw_from, draw_to, &draw_x);
2433 do_con_trol(tty, vc, orig);
2434 }
2435 con_flush(vc, draw_from, draw_to, &draw_x);
2436 console_conditional_schedule();
2437 console_unlock();
2438 notify_update(vc);
2439 return n;
2440}
2441
2442/*
2443 * This is the console switching callback.
2444 *
2445 * Doing console switching in a process context allows
2446 * us to do the switches asynchronously (needed when we want
2447 * to switch due to a keyboard interrupt). Synchronization
2448 * with other console code and prevention of re-entrancy is
2449 * ensured with console_lock.
2450 */
2451static void console_callback(struct work_struct *ignored)
2452{
2453 console_lock();
2454
2455 if (want_console >= 0) {
2456 if (want_console != fg_console &&
2457 vc_cons_allocated(want_console)) {
2458 hide_cursor(vc_cons[fg_console].d);
2459 change_console(vc_cons[want_console].d);
2460 /* we only changed when the console had already
2461 been allocated - a new console is not created
2462 in an interrupt routine */
2463 }
2464 want_console = -1;
2465 }
2466 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2467 do_poke_blanked_console = 0;
2468 poke_blanked_console();
2469 }
2470 if (scrollback_delta) {
2471 struct vc_data *vc = vc_cons[fg_console].d;
2472 clear_selection();
2473 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2474 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2475 scrollback_delta = 0;
2476 }
2477 if (blank_timer_expired) {
2478 do_blank_screen(0);
2479 blank_timer_expired = 0;
2480 }
2481 notify_update(vc_cons[fg_console].d);
2482
2483 console_unlock();
2484}
2485
2486int set_console(int nr)
2487{
2488 struct vc_data *vc = vc_cons[fg_console].d;
2489
2490 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2491 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2492
2493 /*
2494 * Console switch will fail in console_callback() or
2495 * change_console() so there is no point scheduling
2496 * the callback
2497 *
2498 * Existing set_console() users don't check the return
2499 * value so this shouldn't break anything
2500 */
2501 return -EINVAL;
2502 }
2503
2504 want_console = nr;
2505 schedule_console_callback();
2506
2507 return 0;
2508}
2509
2510struct tty_driver *console_driver;
2511
2512#ifdef CONFIG_VT_CONSOLE
2513
2514/**
2515 * vt_kmsg_redirect() - Sets/gets the kernel message console
2516 * @new: The new virtual terminal number or -1 if the console should stay
2517 * unchanged
2518 *
2519 * By default, the kernel messages are always printed on the current virtual
2520 * console. However, the user may modify that default with the
2521 * TIOCL_SETKMSGREDIRECT ioctl call.
2522 *
2523 * This function sets the kernel message console to be @new. It returns the old
2524 * virtual console number. The virtual terminal number 0 (both as parameter and
2525 * return value) means no redirection (i.e. always printed on the currently
2526 * active console).
2527 *
2528 * The parameter -1 means that only the current console is returned, but the
2529 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2530 * case to make the code more understandable.
2531 *
2532 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2533 * the parameter and always returns 0.
2534 */
2535int vt_kmsg_redirect(int new)
2536{
2537 static int kmsg_con;
2538
2539 if (new != -1)
2540 return xchg(&kmsg_con, new);
2541 else
2542 return kmsg_con;
2543}
2544
2545/*
2546 * Console on virtual terminal
2547 *
2548 * The console must be locked when we get here.
2549 */
2550
2551static void vt_console_print(struct console *co, const char *b, unsigned count)
2552{
2553 struct vc_data *vc = vc_cons[fg_console].d;
2554 unsigned char c;
2555 static DEFINE_SPINLOCK(printing_lock);
2556 const ushort *start;
2557 ushort cnt = 0;
2558 ushort myx;
2559 int kmsg_console;
2560
2561 /* console busy or not yet initialized */
2562 if (!printable)
2563 return;
2564 if (!spin_trylock(&printing_lock))
2565 return;
2566
2567 kmsg_console = vt_get_kmsg_redirect();
2568 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2569 vc = vc_cons[kmsg_console - 1].d;
2570
2571 /* read `x' only after setting currcons properly (otherwise
2572 the `x' macro will read the x of the foreground console). */
2573 myx = vc->vc_x;
2574
2575 if (!vc_cons_allocated(fg_console)) {
2576 /* impossible */
2577 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2578 goto quit;
2579 }
2580
2581 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2582 goto quit;
2583
2584 /* undraw cursor first */
2585 if (con_is_fg(vc))
2586 hide_cursor(vc);
2587
2588 start = (ushort *)vc->vc_pos;
2589
2590 /* Contrived structure to try to emulate original need_wrap behaviour
2591 * Problems caused when we have need_wrap set on '\n' character */
2592 while (count--) {
2593 c = *b++;
2594 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2595 if (cnt > 0) {
2596 if (con_is_visible(vc))
2597 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2598 vc->vc_x += cnt;
2599 if (vc->vc_need_wrap)
2600 vc->vc_x--;
2601 cnt = 0;
2602 }
2603 if (c == 8) { /* backspace */
2604 bs(vc);
2605 start = (ushort *)vc->vc_pos;
2606 myx = vc->vc_x;
2607 continue;
2608 }
2609 if (c != 13)
2610 lf(vc);
2611 cr(vc);
2612 start = (ushort *)vc->vc_pos;
2613 myx = vc->vc_x;
2614 if (c == 10 || c == 13)
2615 continue;
2616 }
2617 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2618 notify_write(vc, c);
2619 cnt++;
2620 if (myx == vc->vc_cols - 1) {
2621 vc->vc_need_wrap = 1;
2622 continue;
2623 }
2624 vc->vc_pos += 2;
2625 myx++;
2626 }
2627 if (cnt > 0) {
2628 if (con_is_visible(vc))
2629 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2630 vc->vc_x += cnt;
2631 if (vc->vc_x == vc->vc_cols) {
2632 vc->vc_x--;
2633 vc->vc_need_wrap = 1;
2634 }
2635 }
2636 set_cursor(vc);
2637 notify_update(vc);
2638
2639quit:
2640 spin_unlock(&printing_lock);
2641}
2642
2643static struct tty_driver *vt_console_device(struct console *c, int *index)
2644{
2645 *index = c->index ? c->index-1 : fg_console;
2646 return console_driver;
2647}
2648
2649static struct console vt_console_driver = {
2650 .name = "tty",
2651 .write = vt_console_print,
2652 .device = vt_console_device,
2653 .unblank = unblank_screen,
2654 .flags = CON_PRINTBUFFER,
2655 .index = -1,
2656};
2657#endif
2658
2659/*
2660 * Handling of Linux-specific VC ioctls
2661 */
2662
2663/*
2664 * Generally a bit racy with respect to console_lock();.
2665 *
2666 * There are some functions which don't need it.
2667 *
2668 * There are some functions which can sleep for arbitrary periods
2669 * (paste_selection) but we don't need the lock there anyway.
2670 *
2671 * set_selection has locking, and definitely needs it
2672 */
2673
2674int tioclinux(struct tty_struct *tty, unsigned long arg)
2675{
2676 char type, data;
2677 char __user *p = (char __user *)arg;
2678 int lines;
2679 int ret;
2680
2681 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2682 return -EPERM;
2683 if (get_user(type, p))
2684 return -EFAULT;
2685 ret = 0;
2686
2687 switch (type)
2688 {
2689 case TIOCL_SETSEL:
2690 console_lock();
2691 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2692 console_unlock();
2693 break;
2694 case TIOCL_PASTESEL:
2695 ret = paste_selection(tty);
2696 break;
2697 case TIOCL_UNBLANKSCREEN:
2698 console_lock();
2699 unblank_screen();
2700 console_unlock();
2701 break;
2702 case TIOCL_SELLOADLUT:
2703 console_lock();
2704 ret = sel_loadlut(p);
2705 console_unlock();
2706 break;
2707 case TIOCL_GETSHIFTSTATE:
2708
2709 /*
2710 * Make it possible to react to Shift+Mousebutton.
2711 * Note that 'shift_state' is an undocumented
2712 * kernel-internal variable; programs not closely
2713 * related to the kernel should not use this.
2714 */
2715 data = vt_get_shift_state();
2716 ret = put_user(data, p);
2717 break;
2718 case TIOCL_GETMOUSEREPORTING:
2719 console_lock(); /* May be overkill */
2720 data = mouse_reporting();
2721 console_unlock();
2722 ret = put_user(data, p);
2723 break;
2724 case TIOCL_SETVESABLANK:
2725 console_lock();
2726 ret = set_vesa_blanking(p);
2727 console_unlock();
2728 break;
2729 case TIOCL_GETKMSGREDIRECT:
2730 data = vt_get_kmsg_redirect();
2731 ret = put_user(data, p);
2732 break;
2733 case TIOCL_SETKMSGREDIRECT:
2734 if (!capable(CAP_SYS_ADMIN)) {
2735 ret = -EPERM;
2736 } else {
2737 if (get_user(data, p+1))
2738 ret = -EFAULT;
2739 else
2740 vt_kmsg_redirect(data);
2741 }
2742 break;
2743 case TIOCL_GETFGCONSOLE:
2744 /* No locking needed as this is a transiently
2745 correct return anyway if the caller hasn't
2746 disabled switching */
2747 ret = fg_console;
2748 break;
2749 case TIOCL_SCROLLCONSOLE:
2750 if (get_user(lines, (s32 __user *)(p+4))) {
2751 ret = -EFAULT;
2752 } else {
2753 /* Need the console lock here. Note that lots
2754 of other calls need fixing before the lock
2755 is actually useful ! */
2756 console_lock();
2757 scrollfront(vc_cons[fg_console].d, lines);
2758 console_unlock();
2759 ret = 0;
2760 }
2761 break;
2762 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2763 console_lock();
2764 ignore_poke = 1;
2765 do_blank_screen(0);
2766 console_unlock();
2767 break;
2768 case TIOCL_BLANKEDSCREEN:
2769 ret = console_blanked;
2770 break;
2771 default:
2772 ret = -EINVAL;
2773 break;
2774 }
2775 return ret;
2776}
2777
2778/*
2779 * /dev/ttyN handling
2780 */
2781
2782static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2783{
2784 int retval;
2785
2786 retval = do_con_write(tty, buf, count);
2787 con_flush_chars(tty);
2788
2789 return retval;
2790}
2791
2792static int con_put_char(struct tty_struct *tty, unsigned char ch)
2793{
2794 if (in_interrupt())
2795 return 0; /* n_r3964 calls put_char() from interrupt context */
2796 return do_con_write(tty, &ch, 1);
2797}
2798
2799static int con_write_room(struct tty_struct *tty)
2800{
2801 if (tty->stopped)
2802 return 0;
2803 return 32768; /* No limit, really; we're not buffering */
2804}
2805
2806static int con_chars_in_buffer(struct tty_struct *tty)
2807{
2808 return 0; /* we're not buffering */
2809}
2810
2811/*
2812 * con_throttle and con_unthrottle are only used for
2813 * paste_selection(), which has to stuff in a large number of
2814 * characters...
2815 */
2816static void con_throttle(struct tty_struct *tty)
2817{
2818}
2819
2820static void con_unthrottle(struct tty_struct *tty)
2821{
2822 struct vc_data *vc = tty->driver_data;
2823
2824 wake_up_interruptible(&vc->paste_wait);
2825}
2826
2827/*
2828 * Turn the Scroll-Lock LED on when the tty is stopped
2829 */
2830static void con_stop(struct tty_struct *tty)
2831{
2832 int console_num;
2833 if (!tty)
2834 return;
2835 console_num = tty->index;
2836 if (!vc_cons_allocated(console_num))
2837 return;
2838 vt_kbd_con_stop(console_num);
2839}
2840
2841/*
2842 * Turn the Scroll-Lock LED off when the console is started
2843 */
2844static void con_start(struct tty_struct *tty)
2845{
2846 int console_num;
2847 if (!tty)
2848 return;
2849 console_num = tty->index;
2850 if (!vc_cons_allocated(console_num))
2851 return;
2852 vt_kbd_con_start(console_num);
2853}
2854
2855static void con_flush_chars(struct tty_struct *tty)
2856{
2857 struct vc_data *vc;
2858
2859 if (in_interrupt()) /* from flush_to_ldisc */
2860 return;
2861
2862 /* if we race with con_close(), vt may be null */
2863 console_lock();
2864 vc = tty->driver_data;
2865 if (vc)
2866 set_cursor(vc);
2867 console_unlock();
2868}
2869
2870/*
2871 * Allocate the console screen memory.
2872 */
2873static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2874{
2875 unsigned int currcons = tty->index;
2876 struct vc_data *vc;
2877 int ret;
2878
2879 console_lock();
2880 ret = vc_allocate(currcons);
2881 if (ret)
2882 goto unlock;
2883
2884 vc = vc_cons[currcons].d;
2885
2886 /* Still being freed */
2887 if (vc->port.tty) {
2888 ret = -ERESTARTSYS;
2889 goto unlock;
2890 }
2891
2892 ret = tty_port_install(&vc->port, driver, tty);
2893 if (ret)
2894 goto unlock;
2895
2896 tty->driver_data = vc;
2897 vc->port.tty = tty;
2898
2899 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2900 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2901 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2902 }
2903 if (vc->vc_utf)
2904 tty->termios.c_iflag |= IUTF8;
2905 else
2906 tty->termios.c_iflag &= ~IUTF8;
2907unlock:
2908 console_unlock();
2909 return ret;
2910}
2911
2912static int con_open(struct tty_struct *tty, struct file *filp)
2913{
2914 /* everything done in install */
2915 return 0;
2916}
2917
2918
2919static void con_close(struct tty_struct *tty, struct file *filp)
2920{
2921 /* Nothing to do - we defer to shutdown */
2922}
2923
2924static void con_shutdown(struct tty_struct *tty)
2925{
2926 struct vc_data *vc = tty->driver_data;
2927 BUG_ON(vc == NULL);
2928 console_lock();
2929 vc->port.tty = NULL;
2930 console_unlock();
2931}
2932
2933static int default_color = 7; /* white */
2934static int default_italic_color = 2; // green (ASCII)
2935static int default_underline_color = 3; // cyan (ASCII)
2936module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2937module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2938module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2939
2940static void vc_init(struct vc_data *vc, unsigned int rows,
2941 unsigned int cols, int do_clear)
2942{
2943 int j, k ;
2944
2945 vc->vc_cols = cols;
2946 vc->vc_rows = rows;
2947 vc->vc_size_row = cols << 1;
2948 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2949
2950 set_origin(vc);
2951 vc->vc_pos = vc->vc_origin;
2952 reset_vc(vc);
2953 for (j=k=0; j<16; j++) {
2954 vc->vc_palette[k++] = default_red[j] ;
2955 vc->vc_palette[k++] = default_grn[j] ;
2956 vc->vc_palette[k++] = default_blu[j] ;
2957 }
2958 vc->vc_def_color = default_color;
2959 vc->vc_ulcolor = default_underline_color;
2960 vc->vc_itcolor = default_italic_color;
2961 vc->vc_halfcolor = 0x08; /* grey */
2962 init_waitqueue_head(&vc->paste_wait);
2963 reset_terminal(vc, do_clear);
2964}
2965
2966/*
2967 * This routine initializes console interrupts, and does nothing
2968 * else. If you want the screen to clear, call tty_write with
2969 * the appropriate escape-sequence.
2970 */
2971
2972static int __init con_init(void)
2973{
2974 const char *display_desc = NULL;
2975 struct vc_data *vc;
2976 unsigned int currcons = 0, i;
2977
2978 console_lock();
2979
2980 if (conswitchp)
2981 display_desc = conswitchp->con_startup();
2982 if (!display_desc) {
2983 fg_console = 0;
2984 console_unlock();
2985 return 0;
2986 }
2987
2988 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2989 struct con_driver *con_driver = ®istered_con_driver[i];
2990
2991 if (con_driver->con == NULL) {
2992 con_driver->con = conswitchp;
2993 con_driver->desc = display_desc;
2994 con_driver->flag = CON_DRIVER_FLAG_INIT;
2995 con_driver->first = 0;
2996 con_driver->last = MAX_NR_CONSOLES - 1;
2997 break;
2998 }
2999 }
3000
3001 for (i = 0; i < MAX_NR_CONSOLES; i++)
3002 con_driver_map[i] = conswitchp;
3003
3004 if (blankinterval) {
3005 blank_state = blank_normal_wait;
3006 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3007 }
3008
3009 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3010 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3011 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3012 tty_port_init(&vc->port);
3013 visual_init(vc, currcons, 1);
3014 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3015 vc_init(vc, vc->vc_rows, vc->vc_cols,
3016 currcons || !vc->vc_sw->con_save_screen);
3017 }
3018 currcons = fg_console = 0;
3019 master_display_fg = vc = vc_cons[currcons].d;
3020 set_origin(vc);
3021 save_screen(vc);
3022 gotoxy(vc, vc->vc_x, vc->vc_y);
3023 csi_J(vc, 0);
3024 update_screen(vc);
3025 pr_info("Console: %s %s %dx%d\n",
3026 vc->vc_can_do_color ? "colour" : "mono",
3027 display_desc, vc->vc_cols, vc->vc_rows);
3028 printable = 1;
3029
3030 console_unlock();
3031
3032#ifdef CONFIG_VT_CONSOLE
3033 register_console(&vt_console_driver);
3034#endif
3035 return 0;
3036}
3037console_initcall(con_init);
3038
3039static const struct tty_operations con_ops = {
3040 .install = con_install,
3041 .open = con_open,
3042 .close = con_close,
3043 .write = con_write,
3044 .write_room = con_write_room,
3045 .put_char = con_put_char,
3046 .flush_chars = con_flush_chars,
3047 .chars_in_buffer = con_chars_in_buffer,
3048 .ioctl = vt_ioctl,
3049#ifdef CONFIG_COMPAT
3050 .compat_ioctl = vt_compat_ioctl,
3051#endif
3052 .stop = con_stop,
3053 .start = con_start,
3054 .throttle = con_throttle,
3055 .unthrottle = con_unthrottle,
3056 .resize = vt_resize,
3057 .shutdown = con_shutdown
3058};
3059
3060static struct cdev vc0_cdev;
3061
3062static ssize_t show_tty_active(struct device *dev,
3063 struct device_attribute *attr, char *buf)
3064{
3065 return sprintf(buf, "tty%d\n", fg_console + 1);
3066}
3067static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3068
3069static struct attribute *vt_dev_attrs[] = {
3070 &dev_attr_active.attr,
3071 NULL
3072};
3073
3074ATTRIBUTE_GROUPS(vt_dev);
3075
3076int __init vty_init(const struct file_operations *console_fops)
3077{
3078 cdev_init(&vc0_cdev, console_fops);
3079 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3080 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3081 panic("Couldn't register /dev/tty0 driver\n");
3082 tty0dev = device_create_with_groups(tty_class, NULL,
3083 MKDEV(TTY_MAJOR, 0), NULL,
3084 vt_dev_groups, "tty0");
3085 if (IS_ERR(tty0dev))
3086 tty0dev = NULL;
3087
3088 vcs_init();
3089
3090 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3091 if (!console_driver)
3092 panic("Couldn't allocate console driver\n");
3093
3094 console_driver->name = "tty";
3095 console_driver->name_base = 1;
3096 console_driver->major = TTY_MAJOR;
3097 console_driver->minor_start = 1;
3098 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3099 console_driver->init_termios = tty_std_termios;
3100 if (default_utf8)
3101 console_driver->init_termios.c_iflag |= IUTF8;
3102 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3103 tty_set_operations(console_driver, &con_ops);
3104 if (tty_register_driver(console_driver))
3105 panic("Couldn't register console driver\n");
3106 kbd_init();
3107 console_map_init();
3108#ifdef CONFIG_MDA_CONSOLE
3109 mda_console_init();
3110#endif
3111 return 0;
3112}
3113
3114#ifndef VT_SINGLE_DRIVER
3115
3116static struct class *vtconsole_class;
3117
3118static int do_bind_con_driver(const struct consw *csw, int first, int last,
3119 int deflt)
3120{
3121 struct module *owner = csw->owner;
3122 const char *desc = NULL;
3123 struct con_driver *con_driver;
3124 int i, j = -1, k = -1, retval = -ENODEV;
3125
3126 if (!try_module_get(owner))
3127 return -ENODEV;
3128
3129 WARN_CONSOLE_UNLOCKED();
3130
3131 /* check if driver is registered */
3132 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3133 con_driver = ®istered_con_driver[i];
3134
3135 if (con_driver->con == csw) {
3136 desc = con_driver->desc;
3137 retval = 0;
3138 break;
3139 }
3140 }
3141
3142 if (retval)
3143 goto err;
3144
3145 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3146 csw->con_startup();
3147 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3148 }
3149
3150 if (deflt) {
3151 if (conswitchp)
3152 module_put(conswitchp->owner);
3153
3154 __module_get(owner);
3155 conswitchp = csw;
3156 }
3157
3158 first = max(first, con_driver->first);
3159 last = min(last, con_driver->last);
3160
3161 for (i = first; i <= last; i++) {
3162 int old_was_color;
3163 struct vc_data *vc = vc_cons[i].d;
3164
3165 if (con_driver_map[i])
3166 module_put(con_driver_map[i]->owner);
3167 __module_get(owner);
3168 con_driver_map[i] = csw;
3169
3170 if (!vc || !vc->vc_sw)
3171 continue;
3172
3173 j = i;
3174
3175 if (con_is_visible(vc)) {
3176 k = i;
3177 save_screen(vc);
3178 }
3179
3180 old_was_color = vc->vc_can_do_color;
3181 vc->vc_sw->con_deinit(vc);
3182 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3183 visual_init(vc, i, 0);
3184 set_origin(vc);
3185 update_attr(vc);
3186
3187 /* If the console changed between mono <-> color, then
3188 * the attributes in the screenbuf will be wrong. The
3189 * following resets all attributes to something sane.
3190 */
3191 if (old_was_color != vc->vc_can_do_color)
3192 clear_buffer_attributes(vc);
3193 }
3194
3195 pr_info("Console: switching ");
3196 if (!deflt)
3197 pr_cont("consoles %d-%d ", first + 1, last + 1);
3198 if (j >= 0) {
3199 struct vc_data *vc = vc_cons[j].d;
3200
3201 pr_cont("to %s %s %dx%d\n",
3202 vc->vc_can_do_color ? "colour" : "mono",
3203 desc, vc->vc_cols, vc->vc_rows);
3204
3205 if (k >= 0) {
3206 vc = vc_cons[k].d;
3207 update_screen(vc);
3208 }
3209 } else {
3210 pr_cont("to %s\n", desc);
3211 }
3212
3213 retval = 0;
3214err:
3215 module_put(owner);
3216 return retval;
3217};
3218
3219
3220#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3221/* unlocked version of unbind_con_driver() */
3222int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3223{
3224 struct module *owner = csw->owner;
3225 const struct consw *defcsw = NULL;
3226 struct con_driver *con_driver = NULL, *con_back = NULL;
3227 int i, retval = -ENODEV;
3228
3229 if (!try_module_get(owner))
3230 return -ENODEV;
3231
3232 WARN_CONSOLE_UNLOCKED();
3233
3234 /* check if driver is registered and if it is unbindable */
3235 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3236 con_driver = ®istered_con_driver[i];
3237
3238 if (con_driver->con == csw &&
3239 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3240 retval = 0;
3241 break;
3242 }
3243 }
3244
3245 if (retval)
3246 goto err;
3247
3248 retval = -ENODEV;
3249
3250 /* check if backup driver exists */
3251 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3252 con_back = ®istered_con_driver[i];
3253
3254 if (con_back->con && con_back->con != csw) {
3255 defcsw = con_back->con;
3256 retval = 0;
3257 break;
3258 }
3259 }
3260
3261 if (retval)
3262 goto err;
3263
3264 if (!con_is_bound(csw))
3265 goto err;
3266
3267 first = max(first, con_driver->first);
3268 last = min(last, con_driver->last);
3269
3270 for (i = first; i <= last; i++) {
3271 if (con_driver_map[i] == csw) {
3272 module_put(csw->owner);
3273 con_driver_map[i] = NULL;
3274 }
3275 }
3276
3277 if (!con_is_bound(defcsw)) {
3278 const struct consw *defconsw = conswitchp;
3279
3280 defcsw->con_startup();
3281 con_back->flag |= CON_DRIVER_FLAG_INIT;
3282 /*
3283 * vgacon may change the default driver to point
3284 * to dummycon, we restore it here...
3285 */
3286 conswitchp = defconsw;
3287 }
3288
3289 if (!con_is_bound(csw))
3290 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3291
3292 /* ignore return value, binding should not fail */
3293 do_bind_con_driver(defcsw, first, last, deflt);
3294err:
3295 module_put(owner);
3296 return retval;
3297
3298}
3299EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3300
3301static int vt_bind(struct con_driver *con)
3302{
3303 const struct consw *defcsw = NULL, *csw = NULL;
3304 int i, more = 1, first = -1, last = -1, deflt = 0;
3305
3306 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3307 goto err;
3308
3309 csw = con->con;
3310
3311 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3312 struct con_driver *con = ®istered_con_driver[i];
3313
3314 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3315 defcsw = con->con;
3316 break;
3317 }
3318 }
3319
3320 if (!defcsw)
3321 goto err;
3322
3323 while (more) {
3324 more = 0;
3325
3326 for (i = con->first; i <= con->last; i++) {
3327 if (con_driver_map[i] == defcsw) {
3328 if (first == -1)
3329 first = i;
3330 last = i;
3331 more = 1;
3332 } else if (first != -1)
3333 break;
3334 }
3335
3336 if (first == 0 && last == MAX_NR_CONSOLES -1)
3337 deflt = 1;
3338
3339 if (first != -1)
3340 do_bind_con_driver(csw, first, last, deflt);
3341
3342 first = -1;
3343 last = -1;
3344 deflt = 0;
3345 }
3346
3347err:
3348 return 0;
3349}
3350
3351static int vt_unbind(struct con_driver *con)
3352{
3353 const struct consw *csw = NULL;
3354 int i, more = 1, first = -1, last = -1, deflt = 0;
3355 int ret;
3356
3357 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3358 goto err;
3359
3360 csw = con->con;
3361
3362 while (more) {
3363 more = 0;
3364
3365 for (i = con->first; i <= con->last; i++) {
3366 if (con_driver_map[i] == csw) {
3367 if (first == -1)
3368 first = i;
3369 last = i;
3370 more = 1;
3371 } else if (first != -1)
3372 break;
3373 }
3374
3375 if (first == 0 && last == MAX_NR_CONSOLES -1)
3376 deflt = 1;
3377
3378 if (first != -1) {
3379 ret = do_unbind_con_driver(csw, first, last, deflt);
3380 if (ret != 0)
3381 return ret;
3382 }
3383
3384 first = -1;
3385 last = -1;
3386 deflt = 0;
3387 }
3388
3389err:
3390 return 0;
3391}
3392#else
3393static inline int vt_bind(struct con_driver *con)
3394{
3395 return 0;
3396}
3397static inline int vt_unbind(struct con_driver *con)
3398{
3399 return 0;
3400}
3401#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3402
3403static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3404 const char *buf, size_t count)
3405{
3406 struct con_driver *con = dev_get_drvdata(dev);
3407 int bind = simple_strtoul(buf, NULL, 0);
3408
3409 console_lock();
3410
3411 if (bind)
3412 vt_bind(con);
3413 else
3414 vt_unbind(con);
3415
3416 console_unlock();
3417
3418 return count;
3419}
3420
3421static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3422 char *buf)
3423{
3424 struct con_driver *con = dev_get_drvdata(dev);
3425 int bind = con_is_bound(con->con);
3426
3427 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3428}
3429
3430static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3431 char *buf)
3432{
3433 struct con_driver *con = dev_get_drvdata(dev);
3434
3435 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3436 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3437 con->desc);
3438
3439}
3440
3441static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3442static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3443
3444static struct attribute *con_dev_attrs[] = {
3445 &dev_attr_bind.attr,
3446 &dev_attr_name.attr,
3447 NULL
3448};
3449
3450ATTRIBUTE_GROUPS(con_dev);
3451
3452static int vtconsole_init_device(struct con_driver *con)
3453{
3454 con->flag |= CON_DRIVER_FLAG_ATTR;
3455 return 0;
3456}
3457
3458static void vtconsole_deinit_device(struct con_driver *con)
3459{
3460 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3461}
3462
3463/**
3464 * con_is_bound - checks if driver is bound to the console
3465 * @csw: console driver
3466 *
3467 * RETURNS: zero if unbound, nonzero if bound
3468 *
3469 * Drivers can call this and if zero, they should release
3470 * all resources allocated on con_startup()
3471 */
3472int con_is_bound(const struct consw *csw)
3473{
3474 int i, bound = 0;
3475
3476 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3477 if (con_driver_map[i] == csw) {
3478 bound = 1;
3479 break;
3480 }
3481 }
3482
3483 return bound;
3484}
3485EXPORT_SYMBOL(con_is_bound);
3486
3487/**
3488 * con_debug_enter - prepare the console for the kernel debugger
3489 * @sw: console driver
3490 *
3491 * Called when the console is taken over by the kernel debugger, this
3492 * function needs to save the current console state, then put the console
3493 * into a state suitable for the kernel debugger.
3494 *
3495 * RETURNS:
3496 * Zero on success, nonzero if a failure occurred when trying to prepare
3497 * the console for the debugger.
3498 */
3499int con_debug_enter(struct vc_data *vc)
3500{
3501 int ret = 0;
3502
3503 saved_fg_console = fg_console;
3504 saved_last_console = last_console;
3505 saved_want_console = want_console;
3506 saved_vc_mode = vc->vc_mode;
3507 saved_console_blanked = console_blanked;
3508 vc->vc_mode = KD_TEXT;
3509 console_blanked = 0;
3510 if (vc->vc_sw->con_debug_enter)
3511 ret = vc->vc_sw->con_debug_enter(vc);
3512#ifdef CONFIG_KGDB_KDB
3513 /* Set the initial LINES variable if it is not already set */
3514 if (vc->vc_rows < 999) {
3515 int linecount;
3516 char lns[4];
3517 const char *setargs[3] = {
3518 "set",
3519 "LINES",
3520 lns,
3521 };
3522 if (kdbgetintenv(setargs[0], &linecount)) {
3523 snprintf(lns, 4, "%i", vc->vc_rows);
3524 kdb_set(2, setargs);
3525 }
3526 }
3527 if (vc->vc_cols < 999) {
3528 int colcount;
3529 char cols[4];
3530 const char *setargs[3] = {
3531 "set",
3532 "COLUMNS",
3533 cols,
3534 };
3535 if (kdbgetintenv(setargs[0], &colcount)) {
3536 snprintf(cols, 4, "%i", vc->vc_cols);
3537 kdb_set(2, setargs);
3538 }
3539 }
3540#endif /* CONFIG_KGDB_KDB */
3541 return ret;
3542}
3543EXPORT_SYMBOL_GPL(con_debug_enter);
3544
3545/**
3546 * con_debug_leave - restore console state
3547 * @sw: console driver
3548 *
3549 * Restore the console state to what it was before the kernel debugger
3550 * was invoked.
3551 *
3552 * RETURNS:
3553 * Zero on success, nonzero if a failure occurred when trying to restore
3554 * the console.
3555 */
3556int con_debug_leave(void)
3557{
3558 struct vc_data *vc;
3559 int ret = 0;
3560
3561 fg_console = saved_fg_console;
3562 last_console = saved_last_console;
3563 want_console = saved_want_console;
3564 console_blanked = saved_console_blanked;
3565 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3566
3567 vc = vc_cons[fg_console].d;
3568 if (vc->vc_sw->con_debug_leave)
3569 ret = vc->vc_sw->con_debug_leave(vc);
3570 return ret;
3571}
3572EXPORT_SYMBOL_GPL(con_debug_leave);
3573
3574static int do_register_con_driver(const struct consw *csw, int first, int last)
3575{
3576 struct module *owner = csw->owner;
3577 struct con_driver *con_driver;
3578 const char *desc;
3579 int i, retval;
3580
3581 WARN_CONSOLE_UNLOCKED();
3582
3583 if (!try_module_get(owner))
3584 return -ENODEV;
3585
3586 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3587 con_driver = ®istered_con_driver[i];
3588
3589 /* already registered */
3590 if (con_driver->con == csw) {
3591 retval = -EBUSY;
3592 goto err;
3593 }
3594 }
3595
3596 desc = csw->con_startup();
3597 if (!desc) {
3598 retval = -ENODEV;
3599 goto err;
3600 }
3601
3602 retval = -EINVAL;
3603
3604 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3605 con_driver = ®istered_con_driver[i];
3606
3607 if (con_driver->con == NULL &&
3608 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3609 con_driver->con = csw;
3610 con_driver->desc = desc;
3611 con_driver->node = i;
3612 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3613 CON_DRIVER_FLAG_INIT;
3614 con_driver->first = first;
3615 con_driver->last = last;
3616 retval = 0;
3617 break;
3618 }
3619 }
3620
3621 if (retval)
3622 goto err;
3623
3624 con_driver->dev =
3625 device_create_with_groups(vtconsole_class, NULL,
3626 MKDEV(0, con_driver->node),
3627 con_driver, con_dev_groups,
3628 "vtcon%i", con_driver->node);
3629 if (IS_ERR(con_driver->dev)) {
3630 pr_warn("Unable to create device for %s; errno = %ld\n",
3631 con_driver->desc, PTR_ERR(con_driver->dev));
3632 con_driver->dev = NULL;
3633 } else {
3634 vtconsole_init_device(con_driver);
3635 }
3636
3637err:
3638 module_put(owner);
3639 return retval;
3640}
3641
3642
3643/**
3644 * do_unregister_con_driver - unregister console driver from console layer
3645 * @csw: console driver
3646 *
3647 * DESCRIPTION: All drivers that registers to the console layer must
3648 * call this function upon exit, or if the console driver is in a state
3649 * where it won't be able to handle console services, such as the
3650 * framebuffer console without loaded framebuffer drivers.
3651 *
3652 * The driver must unbind first prior to unregistration.
3653 */
3654int do_unregister_con_driver(const struct consw *csw)
3655{
3656 int i;
3657
3658 /* cannot unregister a bound driver */
3659 if (con_is_bound(csw))
3660 return -EBUSY;
3661
3662 if (csw == conswitchp)
3663 return -EINVAL;
3664
3665 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3666 struct con_driver *con_driver = ®istered_con_driver[i];
3667
3668 if (con_driver->con == csw) {
3669 /*
3670 * Defer the removal of the sysfs entries since that
3671 * will acquire the kernfs s_active lock and we can't
3672 * acquire this lock while holding the console lock:
3673 * the unbind sysfs entry imposes already the opposite
3674 * order. Reset con already here to prevent any later
3675 * lookup to succeed and mark this slot as zombie, so
3676 * it won't get reused until we complete the removal
3677 * in the deferred work.
3678 */
3679 con_driver->con = NULL;
3680 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3681 schedule_work(&con_driver_unregister_work);
3682
3683 return 0;
3684 }
3685 }
3686
3687 return -ENODEV;
3688}
3689EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3690
3691static void con_driver_unregister_callback(struct work_struct *ignored)
3692{
3693 int i;
3694
3695 console_lock();
3696
3697 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3698 struct con_driver *con_driver = ®istered_con_driver[i];
3699
3700 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3701 continue;
3702
3703 console_unlock();
3704
3705 vtconsole_deinit_device(con_driver);
3706 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3707
3708 console_lock();
3709
3710 if (WARN_ON_ONCE(con_driver->con))
3711 con_driver->con = NULL;
3712 con_driver->desc = NULL;
3713 con_driver->dev = NULL;
3714 con_driver->node = 0;
3715 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3716 con_driver->flag = 0;
3717 con_driver->first = 0;
3718 con_driver->last = 0;
3719 }
3720
3721 console_unlock();
3722}
3723
3724/*
3725 * If we support more console drivers, this function is used
3726 * when a driver wants to take over some existing consoles
3727 * and become default driver for newly opened ones.
3728 *
3729 * do_take_over_console is basically a register followed by unbind
3730 */
3731int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3732{
3733 int err;
3734
3735 err = do_register_con_driver(csw, first, last);
3736 /*
3737 * If we get an busy error we still want to bind the console driver
3738 * and return success, as we may have unbound the console driver
3739 * but not unregistered it.
3740 */
3741 if (err == -EBUSY)
3742 err = 0;
3743 if (!err)
3744 do_bind_con_driver(csw, first, last, deflt);
3745
3746 return err;
3747}
3748EXPORT_SYMBOL_GPL(do_take_over_console);
3749
3750
3751/*
3752 * give_up_console is a wrapper to unregister_con_driver. It will only
3753 * work if driver is fully unbound.
3754 */
3755void give_up_console(const struct consw *csw)
3756{
3757 console_lock();
3758 do_unregister_con_driver(csw);
3759 console_unlock();
3760}
3761
3762static int __init vtconsole_class_init(void)
3763{
3764 int i;
3765
3766 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3767 if (IS_ERR(vtconsole_class)) {
3768 pr_warn("Unable to create vt console class; errno = %ld\n",
3769 PTR_ERR(vtconsole_class));
3770 vtconsole_class = NULL;
3771 }
3772
3773 /* Add system drivers to sysfs */
3774 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3775 struct con_driver *con = ®istered_con_driver[i];
3776
3777 if (con->con && !con->dev) {
3778 con->dev =
3779 device_create_with_groups(vtconsole_class, NULL,
3780 MKDEV(0, con->node),
3781 con, con_dev_groups,
3782 "vtcon%i", con->node);
3783
3784 if (IS_ERR(con->dev)) {
3785 pr_warn("Unable to create device for %s; errno = %ld\n",
3786 con->desc, PTR_ERR(con->dev));
3787 con->dev = NULL;
3788 } else {
3789 vtconsole_init_device(con);
3790 }
3791 }
3792 }
3793
3794 return 0;
3795}
3796postcore_initcall(vtconsole_class_init);
3797
3798#endif
3799
3800/*
3801 * Screen blanking
3802 */
3803
3804static int set_vesa_blanking(char __user *p)
3805{
3806 unsigned int mode;
3807
3808 if (get_user(mode, p + 1))
3809 return -EFAULT;
3810
3811 vesa_blank_mode = (mode < 4) ? mode : 0;
3812 return 0;
3813}
3814
3815void do_blank_screen(int entering_gfx)
3816{
3817 struct vc_data *vc = vc_cons[fg_console].d;
3818 int i;
3819
3820 WARN_CONSOLE_UNLOCKED();
3821
3822 if (console_blanked) {
3823 if (blank_state == blank_vesa_wait) {
3824 blank_state = blank_off;
3825 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3826 }
3827 return;
3828 }
3829
3830 /* entering graphics mode? */
3831 if (entering_gfx) {
3832 hide_cursor(vc);
3833 save_screen(vc);
3834 vc->vc_sw->con_blank(vc, -1, 1);
3835 console_blanked = fg_console + 1;
3836 blank_state = blank_off;
3837 set_origin(vc);
3838 return;
3839 }
3840
3841 if (blank_state != blank_normal_wait)
3842 return;
3843 blank_state = blank_off;
3844
3845 /* don't blank graphics */
3846 if (vc->vc_mode != KD_TEXT) {
3847 console_blanked = fg_console + 1;
3848 return;
3849 }
3850
3851 hide_cursor(vc);
3852 del_timer_sync(&console_timer);
3853 blank_timer_expired = 0;
3854
3855 save_screen(vc);
3856 /* In case we need to reset origin, blanking hook returns 1 */
3857 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3858 console_blanked = fg_console + 1;
3859 if (i)
3860 set_origin(vc);
3861
3862 if (console_blank_hook && console_blank_hook(1))
3863 return;
3864
3865 if (vesa_off_interval && vesa_blank_mode) {
3866 blank_state = blank_vesa_wait;
3867 mod_timer(&console_timer, jiffies + vesa_off_interval);
3868 }
3869 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3870}
3871EXPORT_SYMBOL(do_blank_screen);
3872
3873/*
3874 * Called by timer as well as from vt_console_driver
3875 */
3876void do_unblank_screen(int leaving_gfx)
3877{
3878 struct vc_data *vc;
3879
3880 /* This should now always be called from a "sane" (read: can schedule)
3881 * context for the sake of the low level drivers, except in the special
3882 * case of oops_in_progress
3883 */
3884 if (!oops_in_progress)
3885 might_sleep();
3886
3887 WARN_CONSOLE_UNLOCKED();
3888
3889 ignore_poke = 0;
3890 if (!console_blanked)
3891 return;
3892 if (!vc_cons_allocated(fg_console)) {
3893 /* impossible */
3894 pr_warn("unblank_screen: tty %d not allocated ??\n",
3895 fg_console + 1);
3896 return;
3897 }
3898 vc = vc_cons[fg_console].d;
3899 /* Try to unblank in oops case too */
3900 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3901 return; /* but leave console_blanked != 0 */
3902
3903 if (blankinterval) {
3904 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3905 blank_state = blank_normal_wait;
3906 }
3907
3908 console_blanked = 0;
3909 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3910 /* Low-level driver cannot restore -> do it ourselves */
3911 update_screen(vc);
3912 if (console_blank_hook)
3913 console_blank_hook(0);
3914 set_palette(vc);
3915 set_cursor(vc);
3916 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3917}
3918EXPORT_SYMBOL(do_unblank_screen);
3919
3920/*
3921 * This is called by the outside world to cause a forced unblank, mostly for
3922 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3923 * call it with 1 as an argument and so force a mode restore... that may kill
3924 * X or at least garbage the screen but would also make the Oops visible...
3925 */
3926void unblank_screen(void)
3927{
3928 do_unblank_screen(0);
3929}
3930
3931/*
3932 * We defer the timer blanking to work queue so it can take the console mutex
3933 * (console operations can still happen at irq time, but only from printk which
3934 * has the console mutex. Not perfect yet, but better than no locking
3935 */
3936static void blank_screen_t(struct timer_list *unused)
3937{
3938 blank_timer_expired = 1;
3939 schedule_work(&console_work);
3940}
3941
3942void poke_blanked_console(void)
3943{
3944 WARN_CONSOLE_UNLOCKED();
3945
3946 /* Add this so we quickly catch whoever might call us in a non
3947 * safe context. Nowadays, unblank_screen() isn't to be called in
3948 * atomic contexts and is allowed to schedule (with the special case
3949 * of oops_in_progress, but that isn't of any concern for this
3950 * function. --BenH.
3951 */
3952 might_sleep();
3953
3954 /* This isn't perfectly race free, but a race here would be mostly harmless,
3955 * at worse, we'll do a spurrious blank and it's unlikely
3956 */
3957 del_timer(&console_timer);
3958 blank_timer_expired = 0;
3959
3960 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3961 return;
3962 if (console_blanked)
3963 unblank_screen();
3964 else if (blankinterval) {
3965 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3966 blank_state = blank_normal_wait;
3967 }
3968}
3969
3970/*
3971 * Palettes
3972 */
3973
3974static void set_palette(struct vc_data *vc)
3975{
3976 WARN_CONSOLE_UNLOCKED();
3977
3978 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3979 vc->vc_sw->con_set_palette(vc, color_table);
3980}
3981
3982/*
3983 * Load palette into the DAC registers. arg points to a colour
3984 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3985 */
3986
3987int con_set_cmap(unsigned char __user *arg)
3988{
3989 int i, j, k;
3990 unsigned char colormap[3*16];
3991
3992 if (copy_from_user(colormap, arg, sizeof(colormap)))
3993 return -EFAULT;
3994
3995 console_lock();
3996 for (i = k = 0; i < 16; i++) {
3997 default_red[i] = colormap[k++];
3998 default_grn[i] = colormap[k++];
3999 default_blu[i] = colormap[k++];
4000 }
4001 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4002 if (!vc_cons_allocated(i))
4003 continue;
4004 for (j = k = 0; j < 16; j++) {
4005 vc_cons[i].d->vc_palette[k++] = default_red[j];
4006 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4007 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4008 }
4009 set_palette(vc_cons[i].d);
4010 }
4011 console_unlock();
4012
4013 return 0;
4014}
4015
4016int con_get_cmap(unsigned char __user *arg)
4017{
4018 int i, k;
4019 unsigned char colormap[3*16];
4020
4021 console_lock();
4022 for (i = k = 0; i < 16; i++) {
4023 colormap[k++] = default_red[i];
4024 colormap[k++] = default_grn[i];
4025 colormap[k++] = default_blu[i];
4026 }
4027 console_unlock();
4028
4029 if (copy_to_user(arg, colormap, sizeof(colormap)))
4030 return -EFAULT;
4031
4032 return 0;
4033}
4034
4035void reset_palette(struct vc_data *vc)
4036{
4037 int j, k;
4038 for (j=k=0; j<16; j++) {
4039 vc->vc_palette[k++] = default_red[j];
4040 vc->vc_palette[k++] = default_grn[j];
4041 vc->vc_palette[k++] = default_blu[j];
4042 }
4043 set_palette(vc);
4044}
4045
4046/*
4047 * Font switching
4048 *
4049 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4050 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4051 * depending on width) reserved for each character which is kinda wasty, but
4052 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4053 * is up to the actual low-level console-driver convert data into its favorite
4054 * format (maybe we should add a `fontoffset' field to the `display'
4055 * structure so we won't have to convert the fontdata all the time.
4056 * /Jes
4057 */
4058
4059#define max_font_size 65536
4060
4061static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4062{
4063 struct console_font font;
4064 int rc = -EINVAL;
4065 int c;
4066
4067 if (op->data) {
4068 font.data = kmalloc(max_font_size, GFP_KERNEL);
4069 if (!font.data)
4070 return -ENOMEM;
4071 } else
4072 font.data = NULL;
4073
4074 console_lock();
4075 if (vc->vc_mode != KD_TEXT)
4076 rc = -EINVAL;
4077 else if (vc->vc_sw->con_font_get)
4078 rc = vc->vc_sw->con_font_get(vc, &font);
4079 else
4080 rc = -ENOSYS;
4081 console_unlock();
4082
4083 if (rc)
4084 goto out;
4085
4086 c = (font.width+7)/8 * 32 * font.charcount;
4087
4088 if (op->data && font.charcount > op->charcount)
4089 rc = -ENOSPC;
4090 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4091 if (font.width > op->width || font.height > op->height)
4092 rc = -ENOSPC;
4093 } else {
4094 if (font.width != 8)
4095 rc = -EIO;
4096 else if ((op->height && font.height > op->height) ||
4097 font.height > 32)
4098 rc = -ENOSPC;
4099 }
4100 if (rc)
4101 goto out;
4102
4103 op->height = font.height;
4104 op->width = font.width;
4105 op->charcount = font.charcount;
4106
4107 if (op->data && copy_to_user(op->data, font.data, c))
4108 rc = -EFAULT;
4109
4110out:
4111 kfree(font.data);
4112 return rc;
4113}
4114
4115static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4116{
4117 struct console_font font;
4118 int rc = -EINVAL;
4119 int size;
4120
4121 if (vc->vc_mode != KD_TEXT)
4122 return -EINVAL;
4123 if (!op->data)
4124 return -EINVAL;
4125 if (op->charcount > 512)
4126 return -EINVAL;
4127 if (op->width <= 0 || op->width > 32 || op->height > 32)
4128 return -EINVAL;
4129 size = (op->width+7)/8 * 32 * op->charcount;
4130 if (size > max_font_size)
4131 return -ENOSPC;
4132
4133 font.data = memdup_user(op->data, size);
4134 if (IS_ERR(font.data))
4135 return PTR_ERR(font.data);
4136
4137 if (!op->height) { /* Need to guess font height [compat] */
4138 int h, i;
4139 u8 *charmap = font.data;
4140
4141 /*
4142 * If from KDFONTOP ioctl, don't allow things which can be done
4143 * in userland,so that we can get rid of this soon
4144 */
4145 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4146 kfree(font.data);
4147 return -EINVAL;
4148 }
4149
4150 for (h = 32; h > 0; h--)
4151 for (i = 0; i < op->charcount; i++)
4152 if (charmap[32*i+h-1])
4153 goto nonzero;
4154
4155 kfree(font.data);
4156 return -EINVAL;
4157
4158 nonzero:
4159 op->height = h;
4160 }
4161
4162 font.charcount = op->charcount;
4163 font.width = op->width;
4164 font.height = op->height;
4165
4166 console_lock();
4167 if (vc->vc_mode != KD_TEXT)
4168 rc = -EINVAL;
4169 else if (vc->vc_sw->con_font_set)
4170 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4171 else
4172 rc = -ENOSYS;
4173 console_unlock();
4174 kfree(font.data);
4175 return rc;
4176}
4177
4178static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4179{
4180 struct console_font font = {.width = op->width, .height = op->height};
4181 char name[MAX_FONT_NAME];
4182 char *s = name;
4183 int rc;
4184
4185
4186 if (!op->data)
4187 s = NULL;
4188 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4189 return -EFAULT;
4190 else
4191 name[MAX_FONT_NAME - 1] = 0;
4192
4193 console_lock();
4194 if (vc->vc_mode != KD_TEXT) {
4195 console_unlock();
4196 return -EINVAL;
4197 }
4198 if (vc->vc_sw->con_font_default)
4199 rc = vc->vc_sw->con_font_default(vc, &font, s);
4200 else
4201 rc = -ENOSYS;
4202 console_unlock();
4203 if (!rc) {
4204 op->width = font.width;
4205 op->height = font.height;
4206 }
4207 return rc;
4208}
4209
4210static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4211{
4212 int con = op->height;
4213 int rc;
4214
4215
4216 console_lock();
4217 if (vc->vc_mode != KD_TEXT)
4218 rc = -EINVAL;
4219 else if (!vc->vc_sw->con_font_copy)
4220 rc = -ENOSYS;
4221 else if (con < 0 || !vc_cons_allocated(con))
4222 rc = -ENOTTY;
4223 else if (con == vc->vc_num) /* nothing to do */
4224 rc = 0;
4225 else
4226 rc = vc->vc_sw->con_font_copy(vc, con);
4227 console_unlock();
4228 return rc;
4229}
4230
4231int con_font_op(struct vc_data *vc, struct console_font_op *op)
4232{
4233 switch (op->op) {
4234 case KD_FONT_OP_SET:
4235 return con_font_set(vc, op);
4236 case KD_FONT_OP_GET:
4237 return con_font_get(vc, op);
4238 case KD_FONT_OP_SET_DEFAULT:
4239 return con_font_default(vc, op);
4240 case KD_FONT_OP_COPY:
4241 return con_font_copy(vc, op);
4242 }
4243 return -ENOSYS;
4244}
4245
4246/*
4247 * Interface exported to selection and vcs.
4248 */
4249
4250/* used by selection */
4251u16 screen_glyph(struct vc_data *vc, int offset)
4252{
4253 u16 w = scr_readw(screenpos(vc, offset, 1));
4254 u16 c = w & 0xff;
4255
4256 if (w & vc->vc_hi_font_mask)
4257 c |= 0x100;
4258 return c;
4259}
4260EXPORT_SYMBOL_GPL(screen_glyph);
4261
4262/* used by vcs - note the word offset */
4263unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4264{
4265 return screenpos(vc, 2 * w_offset, viewed);
4266}
4267EXPORT_SYMBOL_GPL(screen_pos);
4268
4269void getconsxy(struct vc_data *vc, unsigned char *p)
4270{
4271 p[0] = vc->vc_x;
4272 p[1] = vc->vc_y;
4273}
4274
4275void putconsxy(struct vc_data *vc, unsigned char *p)
4276{
4277 hide_cursor(vc);
4278 gotoxy(vc, p[0], p[1]);
4279 set_cursor(vc);
4280}
4281
4282u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4283{
4284 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4285 return softcursor_original;
4286 return scr_readw(org);
4287}
4288
4289void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4290{
4291 scr_writew(val, org);
4292 if ((unsigned long)org == vc->vc_pos) {
4293 softcursor_original = -1;
4294 add_softcursor(vc);
4295 }
4296}
4297
4298void vcs_scr_updated(struct vc_data *vc)
4299{
4300 notify_update(vc);
4301}
4302
4303void vc_scrolldelta_helper(struct vc_data *c, int lines,
4304 unsigned int rolled_over, void *base, unsigned int size)
4305{
4306 unsigned long ubase = (unsigned long)base;
4307 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4308 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4309 ptrdiff_t origin = (void *)c->vc_origin - base;
4310 int margin = c->vc_size_row * 4;
4311 int from, wrap, from_off, avail;
4312
4313 /* Turn scrollback off */
4314 if (!lines) {
4315 c->vc_visible_origin = c->vc_origin;
4316 return;
4317 }
4318
4319 /* Do we have already enough to allow jumping from 0 to the end? */
4320 if (rolled_over > scr_end + margin) {
4321 from = scr_end;
4322 wrap = rolled_over + c->vc_size_row;
4323 } else {
4324 from = 0;
4325 wrap = size;
4326 }
4327
4328 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4329 avail = (origin - from + wrap) % wrap;
4330
4331 /* Only a little piece would be left? Show all incl. the piece! */
4332 if (avail < 2 * margin)
4333 margin = 0;
4334 if (from_off < margin)
4335 from_off = 0;
4336 if (from_off > avail - margin)
4337 from_off = avail;
4338
4339 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4340}
4341EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4342
4343/*
4344 * Visible symbols for modules
4345 */
4346
4347EXPORT_SYMBOL(color_table);
4348EXPORT_SYMBOL(default_red);
4349EXPORT_SYMBOL(default_grn);
4350EXPORT_SYMBOL(default_blu);
4351EXPORT_SYMBOL(update_region);
4352EXPORT_SYMBOL(redraw_screen);
4353EXPORT_SYMBOL(vc_resize);
4354EXPORT_SYMBOL(fg_console);
4355EXPORT_SYMBOL(console_blank_hook);
4356EXPORT_SYMBOL(console_blanked);
4357EXPORT_SYMBOL(vc_cons);
4358EXPORT_SYMBOL(global_cursor_default);
4359#ifndef VT_SINGLE_DRIVER
4360EXPORT_SYMBOL(give_up_console);
4361#endif