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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 * <[email protected]>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <[email protected]>.
22 *
23 * Dynamic allocation of consoles, [email protected], May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <[email protected]>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <[email protected]> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <[email protected]>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <[email protected]>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <[email protected]>
40 * - David Carter <[email protected]>
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 <[email protected]>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <[email protected]>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <[email protected]>, 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 <[email protected]>, 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/hex.h>
83#include <linux/kd.h>
84#include <linux/slab.h>
85#include <linux/vmalloc.h>
86#include <linux/major.h>
87#include <linux/mm.h>
88#include <linux/console.h>
89#include <linux/init.h>
90#include <linux/mutex.h>
91#include <linux/vt_kern.h>
92#include <linux/selection.h>
93#include <linux/tiocl.h>
94#include <linux/kbd_kern.h>
95#include <linux/consolemap.h>
96#include <linux/timer.h>
97#include <linux/interrupt.h>
98#include <linux/workqueue.h>
99#include <linux/pm.h>
100#include <linux/font.h>
101#include <linux/bitops.h>
102#include <linux/notifier.h>
103#include <linux/device.h>
104#include <linux/io.h>
105#include <linux/uaccess.h>
106#include <linux/kdb.h>
107#include <linux/ctype.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 restore_cur(struct vc_data *vc);
146static void save_cur(struct vc_data *vc);
147static void reset_terminal(struct vc_data *vc, int do_clear);
148static void con_flush_chars(struct tty_struct *tty);
149static int set_vesa_blanking(u8 __user *mode);
150static void set_cursor(struct vc_data *vc);
151static void hide_cursor(struct vc_data *vc);
152static void console_callback(struct work_struct *ignored);
153static void con_driver_unregister_callback(struct work_struct *ignored);
154static void blank_screen_t(struct timer_list *unused);
155static void set_palette(struct vc_data *vc);
156static void unblank_screen(void);
157
158#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
159
160int default_utf8 = true;
161module_param(default_utf8, int, S_IRUGO | S_IWUSR);
162int global_cursor_default = -1;
163module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
164EXPORT_SYMBOL(global_cursor_default);
165
166static int cur_default = CUR_UNDERLINE;
167module_param(cur_default, int, S_IRUGO | S_IWUSR);
168
169/*
170 * ignore_poke: don't unblank the screen when things are typed. This is
171 * mainly for the privacy of braille terminal users.
172 */
173static int ignore_poke;
174
175int do_poke_blanked_console;
176int console_blanked;
177EXPORT_SYMBOL(console_blanked);
178
179static enum vesa_blank_mode vesa_blank_mode;
180static int vesa_off_interval;
181static int blankinterval;
182core_param(consoleblank, blankinterval, int, 0444);
183
184static DECLARE_WORK(console_work, console_callback);
185static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
186
187/*
188 * fg_console is the current virtual console,
189 * last_console is the last used one,
190 * want_console is the console we want to switch to,
191 */
192int fg_console;
193EXPORT_SYMBOL(fg_console);
194int last_console;
195int want_console = -1;
196
197/*
198 * For each existing display, we have a pointer to console currently visible
199 * on that display, allowing consoles other than fg_console to be refreshed
200 * appropriately. Unless the low-level driver supplies its own display_fg
201 * variable, we use this one for the "master display".
202 */
203static struct vc_data *master_display_fg;
204
205/*
206 * Unfortunately, we need to delay tty echo when we're currently writing to the
207 * console since the code is (and always was) not re-entrant, so we schedule
208 * all flip requests to process context with schedule-task() and run it from
209 * console_callback().
210 */
211
212/*
213 * For the same reason, we defer scrollback to the console callback.
214 */
215static int scrollback_delta;
216
217/*
218 * Hook so that the power management routines can (un)blank
219 * the console on our behalf.
220 */
221int (*console_blank_hook)(int);
222EXPORT_SYMBOL(console_blank_hook);
223
224static DEFINE_TIMER(console_timer, blank_screen_t);
225static int blank_state;
226static int blank_timer_expired;
227enum {
228 blank_off = 0,
229 blank_normal_wait,
230 blank_vesa_wait,
231};
232
233/*
234 * struct vc_font
235 */
236
237/**
238 * vc_font_pitch - Calculates the number of bytes between two adjacent scanlines
239 * @font: The VC font
240 *
241 * Returns:
242 * The number of bytes between two adjacent scanlines in the font data
243 */
244unsigned int vc_font_pitch(const struct vc_font *font)
245{
246 return font_glyph_pitch(font->width);
247}
248EXPORT_SYMBOL_GPL(vc_font_pitch);
249
250/**
251 * vc_font_size - Calculates the size of the font data in bytes
252 * @font: The VC font
253 *
254 * vc_font_size() calculates the number of bytes of font data in the
255 * font specified by @font. The function calculates the size from the
256 * font parameters.
257 *
258 * Returns:
259 * The size of the font data in bytes.
260 */
261unsigned int vc_font_size(const struct vc_font *font)
262{
263 return font_glyph_size(font->width, font->height) * font->charcount;
264}
265EXPORT_SYMBOL_GPL(vc_font_size);
266
267/*
268 * /sys/class/tty/tty0/
269 *
270 * the attribute 'active' contains the name of the current vc
271 * console and it supports poll() to detect vc switches
272 */
273static struct device *tty0dev;
274
275/*
276 * Notifier list for console events.
277 */
278static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
279
280int register_vt_notifier(struct notifier_block *nb)
281{
282 return atomic_notifier_chain_register(&vt_notifier_list, nb);
283}
284EXPORT_SYMBOL_GPL(register_vt_notifier);
285
286int unregister_vt_notifier(struct notifier_block *nb)
287{
288 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
289}
290EXPORT_SYMBOL_GPL(unregister_vt_notifier);
291
292static void notify_write(struct vc_data *vc, unsigned int unicode)
293{
294 struct vt_notifier_param param = { .vc = vc, .c = unicode };
295 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
296}
297
298static void notify_update(struct vc_data *vc)
299{
300 struct vt_notifier_param param = { .vc = vc };
301 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
302}
303/*
304 * Low-Level Functions
305 */
306
307static inline bool con_is_fg(const struct vc_data *vc)
308{
309 return vc->vc_num == fg_console;
310}
311
312static inline bool con_should_update(const struct vc_data *vc)
313{
314 return con_is_visible(vc) && !console_blanked;
315}
316
317static inline u16 *screenpos(const struct vc_data *vc, unsigned int offset,
318 bool viewed)
319{
320 unsigned long origin = viewed ? vc->vc_visible_origin : vc->vc_origin;
321
322 return (u16 *)(origin + offset);
323}
324
325static void con_putc(struct vc_data *vc, u16 ca, unsigned int y, unsigned int x)
326{
327 if (vc->vc_sw->con_putc)
328 vc->vc_sw->con_putc(vc, ca, y, x);
329 else
330 vc->vc_sw->con_putcs(vc, &ca, 1, y, x);
331}
332
333/* Called from the keyboard irq path.. */
334static inline void scrolldelta(int lines)
335{
336 /* FIXME */
337 /* scrolldelta needs some kind of consistency lock, but the BKL was
338 and still is not protecting versus the scheduled back end */
339 scrollback_delta += lines;
340 schedule_console_callback();
341}
342
343void schedule_console_callback(void)
344{
345 schedule_work(&console_work);
346}
347
348/*
349 * Code to manage unicode-based screen buffers
350 */
351
352/*
353 * Our screen buffer is preceded by an array of line pointers so that
354 * scrolling only implies some pointer shuffling.
355 */
356
357static u32 **vc_uniscr_alloc(unsigned int cols, unsigned int rows)
358{
359 u32 **uni_lines;
360 void *p;
361 unsigned int memsize, i, col_size = cols * sizeof(**uni_lines);
362
363 /* allocate everything in one go */
364 memsize = col_size * rows;
365 memsize += rows * sizeof(*uni_lines);
366 uni_lines = vzalloc(memsize);
367 if (!uni_lines)
368 return NULL;
369
370 /* initial line pointers */
371 p = uni_lines + rows;
372 for (i = 0; i < rows; i++) {
373 uni_lines[i] = p;
374 p += col_size;
375 }
376
377 return uni_lines;
378}
379
380static void vc_uniscr_free(u32 **uni_lines)
381{
382 vfree(uni_lines);
383}
384
385static void vc_uniscr_set(struct vc_data *vc, u32 **new_uni_lines)
386{
387 vc_uniscr_free(vc->vc_uni_lines);
388 vc->vc_uni_lines = new_uni_lines;
389}
390
391static void vc_uniscr_putc(struct vc_data *vc, u32 uc)
392{
393 if (vc->vc_uni_lines)
394 vc->vc_uni_lines[vc->state.y][vc->state.x] = uc;
395}
396
397static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
398{
399 if (vc->vc_uni_lines) {
400 u32 *ln = vc->vc_uni_lines[vc->state.y];
401 unsigned int x = vc->state.x, cols = vc->vc_cols;
402
403 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
404 memset32(&ln[x], ' ', nr);
405 }
406}
407
408static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
409{
410 if (vc->vc_uni_lines) {
411 u32 *ln = vc->vc_uni_lines[vc->state.y];
412 unsigned int x = vc->state.x, cols = vc->vc_cols;
413
414 memmove(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
415 memset32(&ln[cols - nr], ' ', nr);
416 }
417}
418
419static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
420 unsigned int nr)
421{
422 if (vc->vc_uni_lines)
423 memset32(&vc->vc_uni_lines[vc->state.y][x], ' ', nr);
424}
425
426static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
427 unsigned int nr)
428{
429 if (vc->vc_uni_lines)
430 while (nr--)
431 memset32(vc->vc_uni_lines[y++], ' ', vc->vc_cols);
432}
433
434/* juggling array rotation algorithm (complexity O(N), size complexity O(1)) */
435static void juggle_array(u32 **array, unsigned int size, unsigned int nr)
436{
437 unsigned int gcd_idx;
438
439 for (gcd_idx = 0; gcd_idx < gcd(nr, size); gcd_idx++) {
440 u32 *gcd_idx_val = array[gcd_idx];
441 unsigned int dst_idx = gcd_idx;
442
443 while (1) {
444 unsigned int src_idx = (dst_idx + nr) % size;
445 if (src_idx == gcd_idx)
446 break;
447
448 array[dst_idx] = array[src_idx];
449 dst_idx = src_idx;
450 }
451
452 array[dst_idx] = gcd_idx_val;
453 }
454}
455
456static void vc_uniscr_scroll(struct vc_data *vc, unsigned int top,
457 unsigned int bottom, enum con_scroll dir,
458 unsigned int nr)
459{
460 u32 **uni_lines = vc->vc_uni_lines;
461 unsigned int size = bottom - top;
462
463 if (!uni_lines)
464 return;
465
466 if (dir == SM_DOWN) {
467 juggle_array(&uni_lines[top], size, size - nr);
468 vc_uniscr_clear_lines(vc, top, nr);
469 } else {
470 juggle_array(&uni_lines[top], size, nr);
471 vc_uniscr_clear_lines(vc, bottom - nr, nr);
472 }
473}
474
475static u32 vc_uniscr_getc(struct vc_data *vc, int relative_pos)
476{
477 int pos = vc->state.x + vc->vc_need_wrap + relative_pos;
478
479 if (vc->vc_uni_lines && in_range(pos, 0, vc->vc_cols))
480 return vc->vc_uni_lines[vc->state.y][pos];
481 return 0;
482}
483
484static void vc_uniscr_copy_area(u32 **dst_lines,
485 unsigned int dst_cols,
486 unsigned int dst_rows,
487 u32 **src_lines,
488 unsigned int src_cols,
489 unsigned int src_top_row,
490 unsigned int src_bot_row)
491{
492 unsigned int dst_row = 0;
493
494 if (!dst_lines)
495 return;
496
497 while (src_top_row < src_bot_row) {
498 u32 *src_line = src_lines[src_top_row];
499 u32 *dst_line = dst_lines[dst_row];
500
501 memcpy(dst_line, src_line, src_cols * sizeof(*src_line));
502 if (dst_cols - src_cols)
503 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
504 src_top_row++;
505 dst_row++;
506 }
507 while (dst_row < dst_rows) {
508 u32 *dst_line = dst_lines[dst_row];
509
510 memset32(dst_line, ' ', dst_cols);
511 dst_row++;
512 }
513}
514
515/*
516 * Called from vcs_read() to make sure unicode screen retrieval is possible.
517 * This will initialize the unicode screen buffer if not already done.
518 * This returns 0 if OK, or a negative error code otherwise.
519 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
520 */
521int vc_uniscr_check(struct vc_data *vc)
522{
523 u32 **uni_lines;
524 unsigned short *p;
525 int x, y, mask;
526
527 WARN_CONSOLE_UNLOCKED();
528
529 if (!vc->vc_utf)
530 return -ENODATA;
531
532 if (vc->vc_uni_lines)
533 return 0;
534
535 uni_lines = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
536 if (!uni_lines)
537 return -ENOMEM;
538
539 /*
540 * Let's populate it initially with (imperfect) reverse translation.
541 * This is the next best thing we can do short of having it enabled
542 * from the start even when no users rely on this functionality. True
543 * unicode content will be available after a complete screen refresh.
544 */
545 p = (unsigned short *)vc->vc_origin;
546 mask = vc->vc_hi_font_mask | 0xff;
547 for (y = 0; y < vc->vc_rows; y++) {
548 u32 *line = uni_lines[y];
549 for (x = 0; x < vc->vc_cols; x++) {
550 u16 glyph = scr_readw(p++) & mask;
551 line[x] = inverse_translate(vc, glyph, true);
552 }
553 }
554
555 vc->vc_uni_lines = uni_lines;
556
557 return 0;
558}
559
560/*
561 * Called from vcs_read() to get the unicode data from the screen.
562 * This must be preceded by a successful call to vc_uniscr_check() once
563 * the console lock has been taken.
564 */
565void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
566 unsigned int row, unsigned int col, unsigned int nr)
567{
568 u32 **uni_lines = vc->vc_uni_lines;
569 int offset = row * vc->vc_size_row + col * 2;
570 unsigned long pos;
571
572 if (WARN_ON_ONCE(!uni_lines))
573 return;
574
575 pos = (unsigned long)screenpos(vc, offset, viewed);
576 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
577 /*
578 * Desired position falls in the main screen buffer.
579 * However the actual row/col might be different if
580 * scrollback is active.
581 */
582 row = (pos - vc->vc_origin) / vc->vc_size_row;
583 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
584 memcpy(dest, &uni_lines[row][col], nr * sizeof(u32));
585 } else {
586 /*
587 * Scrollback is active. For now let's simply backtranslate
588 * the screen glyphs until the unicode screen buffer does
589 * synchronize with console display drivers for a scrollback
590 * buffer of its own.
591 */
592 u16 *p = (u16 *)pos;
593 int mask = vc->vc_hi_font_mask | 0xff;
594 u32 *uni_buf = dest;
595 while (nr--) {
596 u16 glyph = scr_readw(p++) & mask;
597 *uni_buf++ = inverse_translate(vc, glyph, true);
598 }
599 }
600}
601
602static void con_scroll(struct vc_data *vc, unsigned int top,
603 unsigned int bottom, enum con_scroll dir,
604 unsigned int nr)
605{
606 unsigned int rows = bottom - top;
607 u16 *clear, *dst, *src;
608
609 if (top + nr >= bottom)
610 nr = rows - 1;
611 if (bottom > vc->vc_rows || top >= bottom || nr < 1)
612 return;
613
614 vc_uniscr_scroll(vc, top, bottom, dir, nr);
615 if (con_is_visible(vc) &&
616 vc->vc_sw->con_scroll(vc, top, bottom, dir, nr))
617 return;
618
619 src = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * top);
620 dst = (u16 *)(vc->vc_origin + vc->vc_size_row * (top + nr));
621
622 if (dir == SM_UP) {
623 clear = src + (rows - nr) * vc->vc_cols;
624 swap(src, dst);
625 }
626 scr_memmovew(dst, src, (rows - nr) * vc->vc_size_row);
627 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
628}
629
630static void do_update_region(struct vc_data *vc, unsigned long start, int count)
631{
632 unsigned int xx, yy, offset;
633 u16 *p = (u16 *)start;
634
635 offset = (start - vc->vc_origin) / 2;
636 xx = offset % vc->vc_cols;
637 yy = offset / vc->vc_cols;
638
639 for(;;) {
640 u16 attrib = scr_readw(p) & 0xff00;
641 int startx = xx;
642 u16 *q = p;
643 while (xx < vc->vc_cols && count) {
644 if (attrib != (scr_readw(p) & 0xff00)) {
645 if (p > q)
646 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
647 startx = xx;
648 q = p;
649 attrib = scr_readw(p) & 0xff00;
650 }
651 p++;
652 xx++;
653 count--;
654 }
655 if (p > q)
656 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
657 if (!count)
658 break;
659 xx = 0;
660 yy++;
661 }
662}
663
664void update_region(struct vc_data *vc, unsigned long start, int count)
665{
666 WARN_CONSOLE_UNLOCKED();
667
668 if (con_should_update(vc)) {
669 hide_cursor(vc);
670 do_update_region(vc, start, count);
671 set_cursor(vc);
672 }
673}
674EXPORT_SYMBOL(update_region);
675
676/* Structure of attributes is hardware-dependent */
677
678static u8 build_attr(struct vc_data *vc, u8 _color,
679 enum vc_intensity _intensity, bool _blink, bool _underline,
680 bool _reverse, bool _italic)
681{
682 if (vc->vc_sw->con_build_attr)
683 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
684 _blink, _underline, _reverse, _italic);
685
686/*
687 * ++roman: I completely changed the attribute format for monochrome
688 * mode (!can_do_color). The formerly used MDA (monochrome display
689 * adapter) format didn't allow the combination of certain effects.
690 * Now the attribute is just a bit vector:
691 * Bit 0..1: intensity (0..2)
692 * Bit 2 : underline
693 * Bit 3 : reverse
694 * Bit 7 : blink
695 */
696 {
697 u8 a = _color;
698 if (!vc->vc_can_do_color)
699 return _intensity |
700 (_italic << 1) |
701 (_underline << 2) |
702 (_reverse << 3) |
703 (_blink << 7);
704 if (_italic)
705 a = (a & 0xF0) | vc->vc_itcolor;
706 else if (_underline)
707 a = (a & 0xf0) | vc->vc_ulcolor;
708 else if (_intensity == VCI_HALF_BRIGHT)
709 a = (a & 0xf0) | vc->vc_halfcolor;
710 if (_reverse)
711 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
712 if (_blink)
713 a ^= 0x80;
714 if (_intensity == VCI_BOLD)
715 a ^= 0x08;
716 if (vc->vc_hi_font_mask == 0x100)
717 a <<= 1;
718 return a;
719 }
720}
721
722static void update_attr(struct vc_data *vc)
723{
724 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
725 vc->state.blink, vc->state.underline,
726 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
727 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
728 VCI_NORMAL, vc->state.blink, false,
729 vc->vc_decscnm, false) << 8);
730}
731
732/* Note: inverting the screen twice should revert to the original state */
733void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
734{
735 u16 *p;
736
737 WARN_CONSOLE_UNLOCKED();
738
739 count /= 2;
740 p = screenpos(vc, offset, viewed);
741 if (vc->vc_sw->con_invert_region) {
742 vc->vc_sw->con_invert_region(vc, p, count);
743 } else {
744 u16 *q = p;
745 int cnt = count;
746 u16 a;
747
748 if (!vc->vc_can_do_color) {
749 while (cnt--) {
750 a = scr_readw(q);
751 a ^= 0x0800;
752 scr_writew(a, q);
753 q++;
754 }
755 } else if (vc->vc_hi_font_mask == 0x100) {
756 while (cnt--) {
757 a = scr_readw(q);
758 a = (a & 0x11ff) |
759 ((a & 0xe000) >> 4) |
760 ((a & 0x0e00) << 4);
761 scr_writew(a, q);
762 q++;
763 }
764 } else {
765 while (cnt--) {
766 a = scr_readw(q);
767 a = (a & 0x88ff) |
768 ((a & 0x7000) >> 4) |
769 ((a & 0x0700) << 4);
770 scr_writew(a, q);
771 q++;
772 }
773 }
774 }
775
776 if (con_should_update(vc))
777 do_update_region(vc, (unsigned long) p, count);
778 notify_update(vc);
779}
780
781/* used by selection: complement pointer position */
782void complement_pos(struct vc_data *vc, int offset)
783{
784 static int old_offset = -1;
785 static unsigned short old;
786 static unsigned short oldx, oldy;
787
788 WARN_CONSOLE_UNLOCKED();
789
790 if (old_offset != -1 && old_offset >= 0 &&
791 old_offset < vc->vc_screenbuf_size) {
792 scr_writew(old, screenpos(vc, old_offset, true));
793 if (con_should_update(vc))
794 con_putc(vc, old, oldy, oldx);
795 notify_update(vc);
796 }
797
798 old_offset = offset;
799
800 if (offset != -1 && offset >= 0 &&
801 offset < vc->vc_screenbuf_size) {
802 unsigned short new;
803 u16 *p = screenpos(vc, offset, true);
804 old = scr_readw(p);
805 new = old ^ vc->vc_complement_mask;
806 scr_writew(new, p);
807 if (con_should_update(vc)) {
808 oldx = (offset >> 1) % vc->vc_cols;
809 oldy = (offset >> 1) / vc->vc_cols;
810 con_putc(vc, new, oldy, oldx);
811 }
812 notify_update(vc);
813 }
814}
815
816static void insert_char(struct vc_data *vc, unsigned int nr)
817{
818 unsigned short *p = (unsigned short *) vc->vc_pos;
819
820 vc_uniscr_insert(vc, nr);
821 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
822 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
823 vc->vc_need_wrap = 0;
824 if (con_should_update(vc))
825 do_update_region(vc, (unsigned long) p,
826 vc->vc_cols - vc->state.x);
827}
828
829static void delete_char(struct vc_data *vc, unsigned int nr)
830{
831 unsigned short *p = (unsigned short *) vc->vc_pos;
832
833 vc_uniscr_delete(vc, nr);
834 scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
835 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
836 nr * 2);
837 vc->vc_need_wrap = 0;
838 if (con_should_update(vc))
839 do_update_region(vc, (unsigned long) p,
840 vc->vc_cols - vc->state.x);
841}
842
843static int softcursor_original = -1;
844
845static void add_softcursor(struct vc_data *vc)
846{
847 int i = scr_readw((u16 *) vc->vc_pos);
848 u32 type = vc->vc_cursor_type;
849
850 if (!(type & CUR_SW))
851 return;
852 if (softcursor_original != -1)
853 return;
854 softcursor_original = i;
855 i |= CUR_SET(type);
856 i ^= CUR_CHANGE(type);
857 if ((type & CUR_ALWAYS_BG) &&
858 (softcursor_original & CUR_BG) == (i & CUR_BG))
859 i ^= CUR_BG;
860 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
861 i ^= CUR_FG;
862 scr_writew(i, (u16 *)vc->vc_pos);
863 if (con_should_update(vc))
864 con_putc(vc, i, vc->state.y, vc->state.x);
865}
866
867static void hide_softcursor(struct vc_data *vc)
868{
869 if (softcursor_original != -1) {
870 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
871 if (con_should_update(vc))
872 con_putc(vc, softcursor_original, vc->state.y,
873 vc->state.x);
874 softcursor_original = -1;
875 }
876}
877
878static void hide_cursor(struct vc_data *vc)
879{
880 if (vc_is_sel(vc))
881 clear_selection();
882
883 vc->vc_sw->con_cursor(vc, false);
884 hide_softcursor(vc);
885}
886
887static void set_cursor(struct vc_data *vc)
888{
889 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
890 return;
891 if (vc->vc_deccm) {
892 if (vc_is_sel(vc))
893 clear_selection();
894 add_softcursor(vc);
895 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
896 vc->vc_sw->con_cursor(vc, true);
897 } else
898 hide_cursor(vc);
899}
900
901static void set_origin(struct vc_data *vc)
902{
903 WARN_CONSOLE_UNLOCKED();
904
905 if (!con_is_visible(vc) ||
906 !vc->vc_sw->con_set_origin ||
907 !vc->vc_sw->con_set_origin(vc))
908 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
909 vc->vc_visible_origin = vc->vc_origin;
910 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
911 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
912 2 * vc->state.x;
913}
914
915static void save_screen(struct vc_data *vc)
916{
917 WARN_CONSOLE_UNLOCKED();
918
919 if (vc->vc_sw->con_save_screen)
920 vc->vc_sw->con_save_screen(vc);
921}
922
923static void flush_scrollback(struct vc_data *vc)
924{
925 WARN_CONSOLE_UNLOCKED();
926
927 set_origin(vc);
928 if (!con_is_visible(vc))
929 return;
930
931 /*
932 * The legacy way for flushing the scrollback buffer is to use a side
933 * effect of the con_switch method. We do it only on the foreground
934 * console as background consoles have no scrollback buffers in that
935 * case and we obviously don't want to switch to them.
936 */
937 hide_cursor(vc);
938 vc->vc_sw->con_switch(vc);
939 set_cursor(vc);
940}
941
942/*
943 * Redrawing of screen
944 */
945
946void clear_buffer_attributes(struct vc_data *vc)
947{
948 unsigned short *p = (unsigned short *)vc->vc_origin;
949 int count = vc->vc_screenbuf_size / 2;
950 int mask = vc->vc_hi_font_mask | 0xff;
951
952 for (; count > 0; count--, p++) {
953 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
954 }
955}
956
957void redraw_screen(struct vc_data *vc, int is_switch)
958{
959 int redraw = 0;
960
961 WARN_CONSOLE_UNLOCKED();
962
963 if (!vc) {
964 /* strange ... */
965 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
966 return;
967 }
968
969 if (is_switch) {
970 struct vc_data *old_vc = vc_cons[fg_console].d;
971 if (old_vc == vc)
972 return;
973 if (!con_is_visible(vc))
974 redraw = 1;
975 *vc->vc_display_fg = vc;
976 fg_console = vc->vc_num;
977 hide_cursor(old_vc);
978 if (!con_is_visible(old_vc)) {
979 save_screen(old_vc);
980 set_origin(old_vc);
981 }
982 if (tty0dev)
983 sysfs_notify(&tty0dev->kobj, NULL, "active");
984 } else {
985 hide_cursor(vc);
986 redraw = 1;
987 }
988
989 if (redraw) {
990 bool update;
991 int old_was_color = vc->vc_can_do_color;
992
993 set_origin(vc);
994 update = vc->vc_sw->con_switch(vc);
995 set_palette(vc);
996 /*
997 * If console changed from mono<->color, the best we can do
998 * is to clear the buffer attributes. As it currently stands,
999 * rebuilding new attributes from the old buffer is not doable
1000 * without overly complex code.
1001 */
1002 if (old_was_color != vc->vc_can_do_color) {
1003 update_attr(vc);
1004 clear_buffer_attributes(vc);
1005 }
1006
1007 if (update && vc->vc_mode != KD_GRAPHICS)
1008 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1009 }
1010 set_cursor(vc);
1011 if (is_switch) {
1012 vt_set_leds_compute_shiftstate();
1013 notify_update(vc);
1014 }
1015}
1016EXPORT_SYMBOL(redraw_screen);
1017
1018/*
1019 * Allocation, freeing and resizing of VTs.
1020 */
1021
1022int vc_cons_allocated(unsigned int i)
1023{
1024 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1025}
1026
1027static void visual_init(struct vc_data *vc, int num, bool init)
1028{
1029 /* ++Geert: vc->vc_sw->con_init determines console size */
1030 if (vc->vc_sw)
1031 module_put(vc->vc_sw->owner);
1032 vc->vc_sw = conswitchp;
1033
1034 if (con_driver_map[num])
1035 vc->vc_sw = con_driver_map[num];
1036
1037 __module_get(vc->vc_sw->owner);
1038 vc->vc_num = num;
1039 vc->vc_display_fg = &master_display_fg;
1040 if (vc->uni_pagedict_loc)
1041 con_free_unimap(vc);
1042 vc->uni_pagedict_loc = &vc->uni_pagedict;
1043 vc->uni_pagedict = NULL;
1044 vc->vc_hi_font_mask = 0;
1045 vc->vc_complement_mask = 0;
1046 vc->vc_can_do_color = 0;
1047 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1048 vc->vc_sw->con_init(vc, init);
1049 if (!vc->vc_complement_mask)
1050 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1051 vc->vc_s_complement_mask = vc->vc_complement_mask;
1052 vc->vc_size_row = vc->vc_cols << 1;
1053 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1054}
1055
1056
1057static void visual_deinit(struct vc_data *vc)
1058{
1059 vc->vc_sw->con_deinit(vc);
1060 module_put(vc->vc_sw->owner);
1061}
1062
1063static void vc_port_destruct(struct tty_port *port)
1064{
1065 struct vc_data *vc = container_of(port, struct vc_data, port);
1066
1067 kfree(vc);
1068}
1069
1070static const struct tty_port_operations vc_port_ops = {
1071 .destruct = vc_port_destruct,
1072};
1073
1074/*
1075 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1076 * [this is to be used together with some user program
1077 * like resize that changes the hardware videomode]
1078 */
1079#define VC_MAXCOL (32767)
1080#define VC_MAXROW (32767)
1081
1082int vc_allocate(unsigned int currcons) /* return 0 on success */
1083{
1084 struct vt_notifier_param param;
1085 struct vc_data *vc;
1086 int err;
1087
1088 WARN_CONSOLE_UNLOCKED();
1089
1090 if (currcons >= MAX_NR_CONSOLES)
1091 return -ENXIO;
1092
1093 if (vc_cons[currcons].d)
1094 return 0;
1095
1096 /* due to the granularity of kmalloc, we waste some memory here */
1097 /* the alloc is done in two steps, to optimize the common situation
1098 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1099 /* although the numbers above are not valid since long ago, the
1100 point is still up-to-date and the comment still has its value
1101 even if only as a historical artifact. --mj, July 1998 */
1102 param.vc = vc = kzalloc_obj(struct vc_data);
1103 if (!vc)
1104 return -ENOMEM;
1105
1106 vc_cons[currcons].d = vc;
1107 tty_port_init(&vc->port);
1108 vc->port.ops = &vc_port_ops;
1109 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1110
1111 visual_init(vc, currcons, true);
1112
1113 if (!*vc->uni_pagedict_loc)
1114 con_set_default_unimap(vc);
1115
1116 err = -EINVAL;
1117 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1118 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1119 goto err_free;
1120 err = -ENOMEM;
1121 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1122 if (!vc->vc_screenbuf)
1123 goto err_free;
1124
1125 /* If no drivers have overridden us and the user didn't pass a
1126 boot option, default to displaying the cursor */
1127 if (global_cursor_default == -1)
1128 global_cursor_default = 1;
1129
1130 vc_init(vc, 1);
1131 vcs_make_sysfs(currcons);
1132 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1133
1134 return 0;
1135err_free:
1136 visual_deinit(vc);
1137 if (*vc->uni_pagedict_loc)
1138 con_free_unimap(vc);
1139 kfree(vc);
1140 vc_cons[currcons].d = NULL;
1141 return err;
1142}
1143
1144static inline int resize_screen(struct vc_data *vc, int width, int height,
1145 bool from_user)
1146{
1147 /* Resizes the resolution of the display adapater */
1148 int err = 0;
1149
1150 if (vc->vc_sw->con_resize)
1151 err = vc->vc_sw->con_resize(vc, width, height, from_user);
1152
1153 return err;
1154}
1155
1156/**
1157 * vc_do_resize - resizing method for the tty
1158 * @tty: tty being resized
1159 * @vc: virtual console private data
1160 * @cols: columns
1161 * @lines: lines
1162 * @from_user: invoked by a user?
1163 *
1164 * Resize a virtual console, clipping according to the actual constraints. If
1165 * the caller passes a tty structure then update the termios winsize
1166 * information and perform any necessary signal handling.
1167 *
1168 * Locking: Caller must hold the console semaphore. Takes the termios rwsem and
1169 * ctrl.lock of the tty IFF a tty is passed.
1170 */
1171static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1172 unsigned int cols, unsigned int lines, bool from_user)
1173{
1174 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1175 unsigned long end;
1176 unsigned int old_rows, old_row_size, first_copied_row;
1177 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1178 unsigned short *oldscreen, *newscreen;
1179 u32 **new_uniscr = NULL;
1180
1181 WARN_CONSOLE_UNLOCKED();
1182
1183 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1184 return -EINVAL;
1185
1186 new_cols = (cols ? cols : vc->vc_cols);
1187 new_rows = (lines ? lines : vc->vc_rows);
1188 new_row_size = new_cols << 1;
1189 new_screen_size = new_row_size * new_rows;
1190
1191 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1192 /*
1193 * This function is being called here to cover the case
1194 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1195 * passing the same fb_var_screeninfo containing the fields
1196 * yres/xres equal to a number non-multiple of vc_font.height
1197 * and yres_virtual/xres_virtual equal to number lesser than the
1198 * vc_font.height and yres/xres.
1199 * In the second call, the struct fb_var_screeninfo isn't
1200 * being modified by the underlying driver because of the
1201 * if above, and this causes the fbcon_display->vrows to become
1202 * negative and it eventually leads to out-of-bound
1203 * access by the imageblit function.
1204 * To give the correct values to the struct and to not have
1205 * to deal with possible errors from the code below, we call
1206 * the resize_screen here as well.
1207 */
1208 return resize_screen(vc, new_cols, new_rows, from_user);
1209 }
1210
1211 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1212 return -EINVAL;
1213 newscreen = kzalloc(new_screen_size, GFP_USER);
1214 if (!newscreen)
1215 return -ENOMEM;
1216
1217 if (vc->vc_uni_lines) {
1218 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1219 if (!new_uniscr) {
1220 kfree(newscreen);
1221 return -ENOMEM;
1222 }
1223 }
1224
1225 if (vc_is_sel(vc))
1226 clear_selection();
1227
1228 old_rows = vc->vc_rows;
1229 old_row_size = vc->vc_size_row;
1230
1231 err = resize_screen(vc, new_cols, new_rows, from_user);
1232 if (err) {
1233 kfree(newscreen);
1234 vc_uniscr_free(new_uniscr);
1235 return err;
1236 }
1237
1238 vc->vc_rows = new_rows;
1239 vc->vc_cols = new_cols;
1240 vc->vc_size_row = new_row_size;
1241 vc->vc_screenbuf_size = new_screen_size;
1242
1243 rlth = min(old_row_size, new_row_size);
1244 rrem = new_row_size - rlth;
1245 old_origin = vc->vc_origin;
1246 new_origin = (long) newscreen;
1247 new_scr_end = new_origin + new_screen_size;
1248
1249 if (vc->state.y > new_rows) {
1250 if (old_rows - vc->state.y < new_rows) {
1251 /*
1252 * Cursor near the bottom, copy contents from the
1253 * bottom of buffer
1254 */
1255 first_copied_row = (old_rows - new_rows);
1256 } else {
1257 /*
1258 * Cursor is in no man's land, copy 1/2 screenful
1259 * from the top and bottom of cursor position
1260 */
1261 first_copied_row = (vc->state.y - new_rows/2);
1262 }
1263 old_origin += first_copied_row * old_row_size;
1264 } else
1265 first_copied_row = 0;
1266 end = old_origin + old_row_size * min(old_rows, new_rows);
1267
1268 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1269 vc->vc_uni_lines, rlth/2, first_copied_row,
1270 min(old_rows, new_rows));
1271 vc_uniscr_set(vc, new_uniscr);
1272
1273 update_attr(vc);
1274
1275 while (old_origin < end) {
1276 scr_memcpyw((unsigned short *) new_origin,
1277 (unsigned short *) old_origin, rlth);
1278 if (rrem)
1279 scr_memsetw((void *)(new_origin + rlth),
1280 vc->vc_video_erase_char, rrem);
1281 old_origin += old_row_size;
1282 new_origin += new_row_size;
1283 }
1284 if (new_scr_end > new_origin)
1285 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1286 new_scr_end - new_origin);
1287 oldscreen = vc->vc_screenbuf;
1288 vc->vc_screenbuf = newscreen;
1289 vc->vc_screenbuf_size = new_screen_size;
1290 set_origin(vc);
1291 kfree(oldscreen);
1292
1293 /* do part of a reset_terminal() */
1294 vc->vc_top = 0;
1295 vc->vc_bottom = vc->vc_rows;
1296 gotoxy(vc, vc->state.x, vc->state.y);
1297 save_cur(vc);
1298
1299 if (tty) {
1300 /* Rewrite the requested winsize data with the actual
1301 resulting sizes */
1302 struct winsize ws;
1303 memset(&ws, 0, sizeof(ws));
1304 ws.ws_row = vc->vc_rows;
1305 ws.ws_col = vc->vc_cols;
1306 ws.ws_ypixel = vc->vc_scan_lines;
1307 tty_do_resize(tty, &ws);
1308 }
1309
1310 if (con_is_visible(vc))
1311 update_screen(vc);
1312 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1313 notify_update(vc);
1314 return err;
1315}
1316
1317/**
1318 * __vc_resize - resize a VT
1319 * @vc: virtual console
1320 * @cols: columns
1321 * @rows: rows
1322 * @from_user: invoked by a user?
1323 *
1324 * Resize a virtual console as seen from the console end of things. We use the
1325 * common vc_do_resize() method to update the structures.
1326 *
1327 * Locking: The caller must hold the console sem to protect console internals
1328 * and @vc->port.tty.
1329 */
1330int __vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows,
1331 bool from_user)
1332{
1333 return vc_do_resize(vc->port.tty, vc, cols, rows, from_user);
1334}
1335EXPORT_SYMBOL(__vc_resize);
1336
1337/**
1338 * vt_resize - resize a VT
1339 * @tty: tty to resize
1340 * @ws: winsize attributes
1341 *
1342 * Resize a virtual terminal. This is called by the tty layer as we register
1343 * our own handler for resizing. The mutual helper does all the actual work.
1344 *
1345 * Locking: Takes the console sem and the called methods then take the tty
1346 * termios_rwsem and the tty ctrl.lock in that order.
1347 */
1348static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1349{
1350 struct vc_data *vc = tty->driver_data;
1351
1352 guard(console_lock)();
1353 return vc_do_resize(tty, vc, ws->ws_col, ws->ws_row, false);
1354}
1355
1356struct vc_data *vc_deallocate(unsigned int currcons)
1357{
1358 struct vc_data *vc = NULL;
1359
1360 WARN_CONSOLE_UNLOCKED();
1361
1362 if (vc_cons_allocated(currcons)) {
1363 struct vt_notifier_param param;
1364
1365 param.vc = vc = vc_cons[currcons].d;
1366 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1367 vcs_remove_sysfs(currcons);
1368 visual_deinit(vc);
1369 con_free_unimap(vc);
1370 put_pid(vc->vt_pid);
1371 vc_uniscr_set(vc, NULL);
1372 kfree(vc->vc_screenbuf);
1373 vc_cons[currcons].d = NULL;
1374 if (vc->vc_saved_screen != NULL) {
1375 kfree(vc->vc_saved_screen);
1376 vc->vc_saved_screen = NULL;
1377 }
1378 vc_uniscr_free(vc->vc_saved_uni_lines);
1379 vc->vc_saved_uni_lines = NULL;
1380 }
1381 return vc;
1382}
1383
1384/*
1385 * VT102 emulator
1386 */
1387
1388enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1389
1390#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1391#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1392#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1393
1394#define decarm VC_REPEAT
1395#define decckm VC_CKMODE
1396#define kbdapplic VC_APPLIC
1397#define lnm VC_CRLF
1398
1399const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1400 8,12,10,14, 9,13,11,15 };
1401EXPORT_SYMBOL(color_table);
1402
1403/* the default colour table, for VGA+ colour systems */
1404unsigned char default_red[] = {
1405 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1406 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1407};
1408module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1409EXPORT_SYMBOL(default_red);
1410
1411unsigned char default_grn[] = {
1412 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1413 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1414};
1415module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1416EXPORT_SYMBOL(default_grn);
1417
1418unsigned char default_blu[] = {
1419 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1420 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1421};
1422module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1423EXPORT_SYMBOL(default_blu);
1424
1425/*
1426 * gotoxy() must verify all boundaries, because the arguments
1427 * might also be negative. If the given position is out of
1428 * bounds, the cursor is placed at the nearest margin.
1429 */
1430static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1431{
1432 int min_y, max_y;
1433
1434 if (new_x < 0)
1435 vc->state.x = 0;
1436 else {
1437 if (new_x >= vc->vc_cols)
1438 vc->state.x = vc->vc_cols - 1;
1439 else
1440 vc->state.x = new_x;
1441 }
1442
1443 if (vc->vc_decom) {
1444 min_y = vc->vc_top;
1445 max_y = vc->vc_bottom;
1446 } else {
1447 min_y = 0;
1448 max_y = vc->vc_rows;
1449 }
1450 if (new_y < min_y)
1451 vc->state.y = min_y;
1452 else if (new_y >= max_y)
1453 vc->state.y = max_y - 1;
1454 else
1455 vc->state.y = new_y;
1456 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1457 (vc->state.x << 1);
1458 vc->vc_need_wrap = 0;
1459}
1460
1461/* for absolute user moves, when decom is set */
1462static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1463{
1464 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1465}
1466
1467void scrollback(struct vc_data *vc)
1468{
1469 scrolldelta(-(vc->vc_rows / 2));
1470}
1471
1472void scrollfront(struct vc_data *vc, int lines)
1473{
1474 if (!lines)
1475 lines = vc->vc_rows / 2;
1476 scrolldelta(lines);
1477}
1478
1479static void lf(struct vc_data *vc)
1480{
1481 /* don't scroll if above bottom of scrolling region, or
1482 * if below scrolling region
1483 */
1484 if (vc->state.y + 1 == vc->vc_bottom)
1485 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1486 else if (vc->state.y < vc->vc_rows - 1) {
1487 vc->state.y++;
1488 vc->vc_pos += vc->vc_size_row;
1489 }
1490 vc->vc_need_wrap = 0;
1491 notify_write(vc, '\n');
1492}
1493
1494static void ri(struct vc_data *vc)
1495{
1496 /* don't scroll if below top of scrolling region, or
1497 * if above scrolling region
1498 */
1499 if (vc->state.y == vc->vc_top)
1500 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1501 else if (vc->state.y > 0) {
1502 vc->state.y--;
1503 vc->vc_pos -= vc->vc_size_row;
1504 }
1505 vc->vc_need_wrap = 0;
1506}
1507
1508static inline void cr(struct vc_data *vc)
1509{
1510 vc->vc_pos -= vc->state.x << 1;
1511 vc->vc_need_wrap = vc->state.x = 0;
1512 notify_write(vc, '\r');
1513}
1514
1515static inline void bs(struct vc_data *vc)
1516{
1517 if (vc->state.x) {
1518 vc->vc_pos -= 2;
1519 vc->state.x--;
1520 vc->vc_need_wrap = 0;
1521 notify_write(vc, '\b');
1522 }
1523}
1524
1525static inline void del(struct vc_data *vc)
1526{
1527 /* ignored */
1528}
1529
1530enum CSI_J {
1531 CSI_J_CURSOR_TO_END = 0,
1532 CSI_J_START_TO_CURSOR = 1,
1533 CSI_J_VISIBLE = 2,
1534 CSI_J_FULL = 3,
1535};
1536
1537static void csi_J(struct vc_data *vc, enum CSI_J vpar)
1538{
1539 unsigned short *start;
1540 unsigned int count;
1541
1542 switch (vpar) {
1543 case CSI_J_CURSOR_TO_END:
1544 vc_uniscr_clear_line(vc, vc->state.x,
1545 vc->vc_cols - vc->state.x);
1546 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1547 vc->vc_rows - vc->state.y - 1);
1548 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1549 start = (unsigned short *)vc->vc_pos;
1550 break;
1551 case CSI_J_START_TO_CURSOR:
1552 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1553 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1554 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1555 start = (unsigned short *)vc->vc_origin;
1556 break;
1557 case CSI_J_FULL:
1558 flush_scrollback(vc);
1559 fallthrough;
1560 case CSI_J_VISIBLE:
1561 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1562 count = vc->vc_cols * vc->vc_rows;
1563 start = (unsigned short *)vc->vc_origin;
1564 break;
1565 default:
1566 return;
1567 }
1568 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1569 if (con_should_update(vc))
1570 do_update_region(vc, (unsigned long) start, count);
1571 vc->vc_need_wrap = 0;
1572}
1573
1574enum {
1575 CSI_K_CURSOR_TO_LINEEND = 0,
1576 CSI_K_LINESTART_TO_CURSOR = 1,
1577 CSI_K_LINE = 2,
1578};
1579
1580static void csi_K(struct vc_data *vc)
1581{
1582 unsigned int count;
1583 unsigned short *start = (unsigned short *)vc->vc_pos;
1584 int offset;
1585
1586 switch (vc->vc_par[0]) {
1587 case CSI_K_CURSOR_TO_LINEEND:
1588 offset = 0;
1589 count = vc->vc_cols - vc->state.x;
1590 break;
1591 case CSI_K_LINESTART_TO_CURSOR:
1592 offset = -vc->state.x;
1593 count = vc->state.x + 1;
1594 break;
1595 case CSI_K_LINE:
1596 offset = -vc->state.x;
1597 count = vc->vc_cols;
1598 break;
1599 default:
1600 return;
1601 }
1602 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
1603 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1604 vc->vc_need_wrap = 0;
1605 if (con_should_update(vc))
1606 do_update_region(vc, (unsigned long)(start + offset), count);
1607}
1608
1609/* erase the following count positions */
1610static void csi_X(struct vc_data *vc)
1611{ /* not vt100? */
1612 unsigned int count = clamp(vc->vc_par[0], 1, vc->vc_cols - vc->state.x);
1613
1614 vc_uniscr_clear_line(vc, vc->state.x, count);
1615 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1616 if (con_should_update(vc))
1617 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, count);
1618 vc->vc_need_wrap = 0;
1619}
1620
1621static void default_attr(struct vc_data *vc)
1622{
1623 vc->state.intensity = VCI_NORMAL;
1624 vc->state.italic = false;
1625 vc->state.underline = false;
1626 vc->state.reverse = false;
1627 vc->state.blink = false;
1628 vc->state.color = vc->vc_def_color;
1629}
1630
1631struct rgb { u8 r; u8 g; u8 b; };
1632
1633static void rgb_from_256(unsigned int i, struct rgb *c)
1634{
1635 if (i < 8) { /* Standard colours. */
1636 c->r = i&1 ? 0xaa : 0x00;
1637 c->g = i&2 ? 0xaa : 0x00;
1638 c->b = i&4 ? 0xaa : 0x00;
1639 } else if (i < 16) {
1640 c->r = i&1 ? 0xff : 0x55;
1641 c->g = i&2 ? 0xff : 0x55;
1642 c->b = i&4 ? 0xff : 0x55;
1643 } else if (i < 232) { /* 6x6x6 colour cube. */
1644 i -= 16;
1645 c->b = i % 6 * 255 / 6;
1646 i /= 6;
1647 c->g = i % 6 * 255 / 6;
1648 i /= 6;
1649 c->r = i * 255 / 6;
1650 } else /* Grayscale ramp. */
1651 c->r = c->g = c->b = i * 10 - 2312;
1652}
1653
1654static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1655{
1656 u8 hue = 0, max = max3(c->r, c->g, c->b);
1657
1658 if (c->r > max / 2)
1659 hue |= 4;
1660 if (c->g > max / 2)
1661 hue |= 2;
1662 if (c->b > max / 2)
1663 hue |= 1;
1664
1665 if (hue == 7 && max <= 0x55) {
1666 hue = 0;
1667 vc->state.intensity = VCI_BOLD;
1668 } else if (max > 0xaa)
1669 vc->state.intensity = VCI_BOLD;
1670 else
1671 vc->state.intensity = VCI_NORMAL;
1672
1673 vc->state.color = (vc->state.color & 0xf0) | hue;
1674}
1675
1676static void rgb_background(struct vc_data *vc, const struct rgb *c)
1677{
1678 /* For backgrounds, err on the dark side. */
1679 vc->state.color = (vc->state.color & 0x0f)
1680 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1681}
1682
1683/*
1684 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1685 * and thus need to be detected and ignored by hand.
1686 *
1687 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1688 * supporting them.
1689 */
1690static int vc_t416_color(struct vc_data *vc, int i,
1691 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1692{
1693 struct rgb c;
1694
1695 i++;
1696 if (i > vc->vc_npar)
1697 return i;
1698
1699 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1700 /* 256 colours */
1701 i++;
1702 rgb_from_256(vc->vc_par[i], &c);
1703 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1704 /* 24 bit */
1705 c.r = vc->vc_par[i + 1];
1706 c.g = vc->vc_par[i + 2];
1707 c.b = vc->vc_par[i + 3];
1708 i += 3;
1709 } else
1710 return i;
1711
1712 set_color(vc, &c);
1713
1714 return i;
1715}
1716
1717enum {
1718 CSI_m_DEFAULT = 0,
1719 CSI_m_BOLD = 1,
1720 CSI_m_HALF_BRIGHT = 2,
1721 CSI_m_ITALIC = 3,
1722 CSI_m_UNDERLINE = 4,
1723 CSI_m_BLINK = 5,
1724 CSI_m_REVERSE = 7,
1725 CSI_m_PRI_FONT = 10,
1726 CSI_m_ALT_FONT1 = 11,
1727 CSI_m_ALT_FONT2 = 12,
1728 CSI_m_DOUBLE_UNDERLINE = 21,
1729 CSI_m_NORMAL_INTENSITY = 22,
1730 CSI_m_NO_ITALIC = 23,
1731 CSI_m_NO_UNDERLINE = 24,
1732 CSI_m_NO_BLINK = 25,
1733 CSI_m_NO_REVERSE = 27,
1734 CSI_m_FG_COLOR_BEG = 30,
1735 CSI_m_FG_COLOR_END = 37,
1736 CSI_m_FG_COLOR = 38,
1737 CSI_m_DEFAULT_FG_COLOR = 39,
1738 CSI_m_BG_COLOR_BEG = 40,
1739 CSI_m_BG_COLOR_END = 47,
1740 CSI_m_BG_COLOR = 48,
1741 CSI_m_DEFAULT_BG_COLOR = 49,
1742 CSI_m_UNDERLINE_COLOR = 58,
1743 CSI_m_BRIGHT_FG_COLOR_BEG = 90,
1744 CSI_m_BRIGHT_FG_COLOR_END = 97,
1745 CSI_m_BRIGHT_FG_COLOR_OFF = CSI_m_BRIGHT_FG_COLOR_BEG - CSI_m_FG_COLOR_BEG,
1746 CSI_m_BRIGHT_BG_COLOR_BEG = 100,
1747 CSI_m_BRIGHT_BG_COLOR_END = 107,
1748 CSI_m_BRIGHT_BG_COLOR_OFF = CSI_m_BRIGHT_BG_COLOR_BEG - CSI_m_BG_COLOR_BEG,
1749};
1750
1751/* console_lock is held */
1752static void csi_m(struct vc_data *vc)
1753{
1754 int i;
1755
1756 for (i = 0; i <= vc->vc_npar; i++)
1757 switch (vc->vc_par[i]) {
1758 case CSI_m_DEFAULT: /* all attributes off */
1759 default_attr(vc);
1760 break;
1761 case CSI_m_BOLD:
1762 vc->state.intensity = VCI_BOLD;
1763 break;
1764 case CSI_m_HALF_BRIGHT:
1765 vc->state.intensity = VCI_HALF_BRIGHT;
1766 break;
1767 case CSI_m_ITALIC:
1768 vc->state.italic = true;
1769 break;
1770 case CSI_m_DOUBLE_UNDERLINE:
1771 /*
1772 * No console drivers support double underline, so
1773 * convert it to a single underline.
1774 */
1775 case CSI_m_UNDERLINE:
1776 vc->state.underline = true;
1777 break;
1778 case CSI_m_BLINK:
1779 vc->state.blink = true;
1780 break;
1781 case CSI_m_REVERSE:
1782 vc->state.reverse = true;
1783 break;
1784 case CSI_m_PRI_FONT: /* ANSI X3.64-1979 (SCO-ish?)
1785 * Select primary font, don't display control chars if
1786 * defined, don't set bit 8 on output.
1787 */
1788 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
1789 vc->vc_disp_ctrl = 0;
1790 vc->vc_toggle_meta = 0;
1791 break;
1792 case CSI_m_ALT_FONT1: /* ANSI X3.64-1979 (SCO-ish?)
1793 * Select first alternate font, lets chars < 32 be
1794 * displayed as ROM chars.
1795 */
1796 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1797 vc->vc_disp_ctrl = 1;
1798 vc->vc_toggle_meta = 0;
1799 break;
1800 case CSI_m_ALT_FONT2: /* ANSI X3.64-1979 (SCO-ish?)
1801 * Select second alternate font, toggle high bit
1802 * before displaying as ROM char.
1803 */
1804 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1805 vc->vc_disp_ctrl = 1;
1806 vc->vc_toggle_meta = 1;
1807 break;
1808 case CSI_m_NORMAL_INTENSITY:
1809 vc->state.intensity = VCI_NORMAL;
1810 break;
1811 case CSI_m_NO_ITALIC:
1812 vc->state.italic = false;
1813 break;
1814 case CSI_m_NO_UNDERLINE:
1815 vc->state.underline = false;
1816 break;
1817 case CSI_m_NO_BLINK:
1818 vc->state.blink = false;
1819 break;
1820 case CSI_m_NO_REVERSE:
1821 vc->state.reverse = false;
1822 break;
1823 case CSI_m_FG_COLOR:
1824 i = vc_t416_color(vc, i, rgb_foreground);
1825 break;
1826 case CSI_m_BG_COLOR:
1827 i = vc_t416_color(vc, i, rgb_background);
1828 break;
1829 case CSI_m_DEFAULT_FG_COLOR:
1830 vc->state.color = (vc->vc_def_color & 0x0f) |
1831 (vc->state.color & 0xf0);
1832 break;
1833 case CSI_m_DEFAULT_BG_COLOR:
1834 vc->state.color = (vc->vc_def_color & 0xf0) |
1835 (vc->state.color & 0x0f);
1836 break;
1837 case CSI_m_BRIGHT_FG_COLOR_BEG ... CSI_m_BRIGHT_FG_COLOR_END:
1838 vc->state.intensity = VCI_BOLD;
1839 vc->vc_par[i] -= CSI_m_BRIGHT_FG_COLOR_OFF;
1840 fallthrough;
1841 case CSI_m_FG_COLOR_BEG ... CSI_m_FG_COLOR_END:
1842 vc->vc_par[i] -= CSI_m_FG_COLOR_BEG;
1843 vc->state.color = color_table[vc->vc_par[i]] |
1844 (vc->state.color & 0xf0);
1845 break;
1846 case CSI_m_BRIGHT_BG_COLOR_BEG ... CSI_m_BRIGHT_BG_COLOR_END:
1847 vc->vc_par[i] -= CSI_m_BRIGHT_BG_COLOR_OFF;
1848 fallthrough;
1849 case CSI_m_BG_COLOR_BEG ... CSI_m_BG_COLOR_END:
1850 vc->vc_par[i] -= CSI_m_BG_COLOR_BEG;
1851 vc->state.color = (color_table[vc->vc_par[i]] << 4) |
1852 (vc->state.color & 0x0f);
1853 break;
1854 }
1855 update_attr(vc);
1856}
1857
1858static void respond_string(const char *p, size_t len, struct tty_port *port)
1859{
1860 tty_insert_flip_string(port, p, len);
1861 tty_flip_buffer_push(port);
1862}
1863
1864static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1865{
1866 char buf[40];
1867 int len;
1868
1869 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1870 (vc->vc_decom ? vc->vc_top + 1 : 1),
1871 vc->state.x + 1);
1872 respond_string(buf, len, tty->port);
1873}
1874
1875static inline void status_report(struct tty_struct *tty)
1876{
1877 static const char teminal_ok[] = "\033[0n";
1878
1879 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1880}
1881
1882static inline void respond_ID(struct tty_struct *tty)
1883{
1884 /* terminal answer to an ESC-Z or csi0c query. */
1885 static const char vt102_id[] = "\033[?6c";
1886
1887 respond_string(vt102_id, strlen(vt102_id), tty->port);
1888}
1889
1890void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1891{
1892 char buf[8];
1893 int len;
1894
1895 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1896 (char)('!' + mrx), (char)('!' + mry));
1897 respond_string(buf, len, tty->port);
1898}
1899
1900/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1901int mouse_reporting(void)
1902{
1903 return vc_cons[fg_console].d->vc_report_mouse;
1904}
1905
1906/* invoked via ioctl(TIOCLINUX) */
1907static int get_bracketed_paste(struct tty_struct *tty)
1908{
1909 struct vc_data *vc = tty->driver_data;
1910
1911 return vc->vc_bracketed_paste;
1912}
1913
1914/* console_lock is held */
1915static void enter_alt_screen(struct vc_data *vc)
1916{
1917 unsigned int size = vc->vc_rows * vc->vc_cols * 2;
1918
1919 if (vc->vc_saved_screen != NULL)
1920 return; /* Already inside an alt-screen */
1921 vc->vc_saved_screen = kmemdup((u16 *)vc->vc_origin, size, GFP_KERNEL);
1922 if (vc->vc_saved_screen == NULL)
1923 return;
1924 vc->vc_saved_uni_lines = vc->vc_uni_lines;
1925 vc->vc_uni_lines = NULL;
1926 vc->vc_saved_rows = vc->vc_rows;
1927 vc->vc_saved_cols = vc->vc_cols;
1928 save_cur(vc);
1929 /* clear entire screen */
1930 csi_J(vc, CSI_J_FULL);
1931}
1932
1933/* console_lock is held */
1934static void leave_alt_screen(struct vc_data *vc)
1935{
1936 unsigned int rows = min(vc->vc_saved_rows, vc->vc_rows);
1937 unsigned int cols = min(vc->vc_saved_cols, vc->vc_cols);
1938 u16 *src, *dest;
1939
1940 if (vc->vc_saved_screen == NULL)
1941 return; /* Not inside an alt-screen */
1942 for (unsigned int r = 0; r < rows; r++) {
1943 src = vc->vc_saved_screen + r * vc->vc_saved_cols;
1944 dest = ((u16 *)vc->vc_origin) + r * vc->vc_cols;
1945 memcpy(dest, src, 2 * cols);
1946 }
1947 /*
1948 * If the console was resized while in the alternate screen,
1949 * resize the saved unicode buffer to the current dimensions.
1950 * On allocation failure new_uniscr is NULL, causing the old
1951 * buffer to be freed and vc_uni_lines to be lazily rebuilt
1952 * via vc_uniscr_check() when next needed.
1953 */
1954 if (vc->vc_saved_uni_lines &&
1955 (vc->vc_saved_rows != vc->vc_rows ||
1956 vc->vc_saved_cols != vc->vc_cols)) {
1957 u32 **new_uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
1958
1959 if (new_uniscr)
1960 vc_uniscr_copy_area(new_uniscr, vc->vc_cols, vc->vc_rows,
1961 vc->vc_saved_uni_lines, cols, 0, rows);
1962 vc_uniscr_free(vc->vc_saved_uni_lines);
1963 vc->vc_saved_uni_lines = new_uniscr;
1964 }
1965 vc_uniscr_set(vc, vc->vc_saved_uni_lines);
1966 vc->vc_saved_uni_lines = NULL;
1967 restore_cur(vc);
1968 /* Update the entire screen */
1969 if (con_should_update(vc))
1970 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1971 kfree(vc->vc_saved_screen);
1972 vc->vc_saved_screen = NULL;
1973}
1974
1975enum {
1976 CSI_DEC_hl_CURSOR_KEYS = 1, /* CKM: cursor keys send ^[Ox/^[[x */
1977 CSI_DEC_hl_132_COLUMNS = 3, /* COLM: 80/132 mode switch */
1978 CSI_DEC_hl_REVERSE_VIDEO = 5, /* SCNM */
1979 CSI_DEC_hl_ORIGIN_MODE = 6, /* OM: origin relative/absolute */
1980 CSI_DEC_hl_AUTOWRAP = 7, /* AWM */
1981 CSI_DEC_hl_AUTOREPEAT = 8, /* ARM */
1982 CSI_DEC_hl_MOUSE_X10 = 9,
1983 CSI_DEC_hl_SHOW_CURSOR = 25, /* TCEM */
1984 CSI_DEC_hl_MOUSE_VT200 = 1000,
1985 CSI_DEC_hl_ALT_SCREEN = 1049,
1986 CSI_DEC_hl_BRACKETED_PASTE = 2004,
1987};
1988
1989/* console_lock is held */
1990static void csi_DEC_hl(struct vc_data *vc, bool on_off)
1991{
1992 unsigned int i;
1993
1994 for (i = 0; i <= vc->vc_npar; i++)
1995 switch (vc->vc_par[i]) {
1996 case CSI_DEC_hl_CURSOR_KEYS:
1997 if (on_off)
1998 set_kbd(vc, decckm);
1999 else
2000 clr_kbd(vc, decckm);
2001 break;
2002 case CSI_DEC_hl_132_COLUMNS: /* unimplemented */
2003#if 0
2004 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
2005 /* this alone does not suffice; some user mode
2006 utility has to change the hardware regs */
2007#endif
2008 break;
2009 case CSI_DEC_hl_REVERSE_VIDEO:
2010 if (vc->vc_decscnm != on_off) {
2011 vc->vc_decscnm = on_off;
2012 invert_screen(vc, 0, vc->vc_screenbuf_size,
2013 false);
2014 update_attr(vc);
2015 }
2016 break;
2017 case CSI_DEC_hl_ORIGIN_MODE:
2018 vc->vc_decom = on_off;
2019 gotoxay(vc, 0, 0);
2020 break;
2021 case CSI_DEC_hl_AUTOWRAP:
2022 vc->vc_decawm = on_off;
2023 break;
2024 case CSI_DEC_hl_AUTOREPEAT:
2025 if (on_off)
2026 set_kbd(vc, decarm);
2027 else
2028 clr_kbd(vc, decarm);
2029 break;
2030 case CSI_DEC_hl_MOUSE_X10:
2031 vc->vc_report_mouse = on_off ? 1 : 0;
2032 break;
2033 case CSI_DEC_hl_SHOW_CURSOR:
2034 vc->vc_deccm = on_off;
2035 break;
2036 case CSI_DEC_hl_MOUSE_VT200:
2037 vc->vc_report_mouse = on_off ? 2 : 0;
2038 break;
2039 case CSI_DEC_hl_BRACKETED_PASTE:
2040 vc->vc_bracketed_paste = on_off;
2041 break;
2042 case CSI_DEC_hl_ALT_SCREEN:
2043 if (on_off)
2044 enter_alt_screen(vc);
2045 else
2046 leave_alt_screen(vc);
2047 break;
2048 }
2049}
2050
2051enum {
2052 CSI_hl_DISPLAY_CTRL = 3, /* handle ansi control chars */
2053 CSI_hl_INSERT = 4, /* IRM: insert/replace */
2054 CSI_hl_AUTO_NL = 20, /* LNM: Enter == CrLf/Lf */
2055};
2056
2057/* console_lock is held */
2058static void csi_hl(struct vc_data *vc, bool on_off)
2059{
2060 unsigned int i;
2061
2062 for (i = 0; i <= vc->vc_npar; i++)
2063 switch (vc->vc_par[i]) { /* ANSI modes set/reset */
2064 case CSI_hl_DISPLAY_CTRL:
2065 vc->vc_disp_ctrl = on_off;
2066 break;
2067 case CSI_hl_INSERT:
2068 vc->vc_decim = on_off;
2069 break;
2070 case CSI_hl_AUTO_NL:
2071 if (on_off)
2072 set_kbd(vc, lnm);
2073 else
2074 clr_kbd(vc, lnm);
2075 break;
2076 }
2077}
2078
2079enum CSI_right_square_bracket {
2080 CSI_RSB_COLOR_FOR_UNDERLINE = 1,
2081 CSI_RSB_COLOR_FOR_HALF_BRIGHT = 2,
2082 CSI_RSB_MAKE_CUR_COLOR_DEFAULT = 8,
2083 CSI_RSB_BLANKING_INTERVAL = 9,
2084 CSI_RSB_BELL_FREQUENCY = 10,
2085 CSI_RSB_BELL_DURATION = 11,
2086 CSI_RSB_BRING_CONSOLE_TO_FRONT = 12,
2087 CSI_RSB_UNBLANK = 13,
2088 CSI_RSB_VESA_OFF_INTERVAL = 14,
2089 CSI_RSB_BRING_PREV_CONSOLE_TO_FRONT = 15,
2090 CSI_RSB_CURSOR_BLINK_INTERVAL = 16,
2091};
2092
2093/*
2094 * csi_RSB - csi+] (Right Square Bracket) handler
2095 *
2096 * These are linux console private sequences.
2097 *
2098 * console_lock is held
2099 */
2100static void csi_RSB(struct vc_data *vc)
2101{
2102 switch (vc->vc_par[0]) {
2103 case CSI_RSB_COLOR_FOR_UNDERLINE:
2104 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
2105 vc->vc_ulcolor = color_table[vc->vc_par[1]];
2106 if (vc->state.underline)
2107 update_attr(vc);
2108 }
2109 break;
2110 case CSI_RSB_COLOR_FOR_HALF_BRIGHT:
2111 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
2112 vc->vc_halfcolor = color_table[vc->vc_par[1]];
2113 if (vc->state.intensity == VCI_HALF_BRIGHT)
2114 update_attr(vc);
2115 }
2116 break;
2117 case CSI_RSB_MAKE_CUR_COLOR_DEFAULT:
2118 vc->vc_def_color = vc->vc_attr;
2119 if (vc->vc_hi_font_mask == 0x100)
2120 vc->vc_def_color >>= 1;
2121 default_attr(vc);
2122 update_attr(vc);
2123 break;
2124 case CSI_RSB_BLANKING_INTERVAL:
2125 blankinterval = min(vc->vc_par[1], 60U) * 60;
2126 poke_blanked_console();
2127 break;
2128 case CSI_RSB_BELL_FREQUENCY:
2129 if (vc->vc_npar >= 1)
2130 vc->vc_bell_pitch = vc->vc_par[1];
2131 else
2132 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2133 break;
2134 case CSI_RSB_BELL_DURATION:
2135 if (vc->vc_npar >= 1)
2136 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
2137 msecs_to_jiffies(vc->vc_par[1]) : 0;
2138 else
2139 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2140 break;
2141 case CSI_RSB_BRING_CONSOLE_TO_FRONT:
2142 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
2143 set_console(vc->vc_par[1] - 1);
2144 break;
2145 case CSI_RSB_UNBLANK:
2146 poke_blanked_console();
2147 break;
2148 case CSI_RSB_VESA_OFF_INTERVAL:
2149 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
2150 break;
2151 case CSI_RSB_BRING_PREV_CONSOLE_TO_FRONT:
2152 set_console(last_console);
2153 break;
2154 case CSI_RSB_CURSOR_BLINK_INTERVAL:
2155 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
2156 vc->vc_par[1] <= USHRT_MAX)
2157 vc->vc_cur_blink_ms = vc->vc_par[1];
2158 else
2159 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2160 break;
2161 }
2162}
2163
2164/* console_lock is held */
2165static void csi_at(struct vc_data *vc, unsigned int nr)
2166{
2167 nr = clamp(nr, 1, vc->vc_cols - vc->state.x);
2168 insert_char(vc, nr);
2169}
2170
2171/* console_lock is held */
2172static void csi_L(struct vc_data *vc)
2173{
2174 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_rows - vc->state.y);
2175
2176 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
2177 vc->vc_need_wrap = 0;
2178}
2179
2180/* console_lock is held */
2181static void csi_P(struct vc_data *vc)
2182{
2183 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_cols - vc->state.x);
2184
2185 delete_char(vc, nr);
2186}
2187
2188/* console_lock is held */
2189static void csi_M(struct vc_data *vc)
2190{
2191 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_rows - vc->state.y);
2192
2193 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
2194 vc->vc_need_wrap = 0;
2195}
2196
2197/* console_lock is held (except via vc_init->reset_terminal */
2198static void save_cur(struct vc_data *vc)
2199{
2200 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
2201}
2202
2203/* console_lock is held */
2204static void restore_cur(struct vc_data *vc)
2205{
2206 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2207
2208 gotoxy(vc, vc->state.x, vc->state.y);
2209 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2210 vc);
2211 update_attr(vc);
2212 vc->vc_need_wrap = 0;
2213}
2214
2215/**
2216 * enum vc_ctl_state - control characters state of a vt
2217 *
2218 * @ESnormal: initial state, no control characters parsed
2219 * @ESesc: ESC parsed
2220 * @ESsquare: CSI parsed -- modifiers/parameters/ctrl chars expected
2221 * @ESgetpars: CSI parsed -- parameters/ctrl chars expected
2222 * @ESgetsubpars: CSI m parsed -- subparameters expected
2223 * @ESfunckey: CSI [ parsed
2224 * @EShash: ESC # parsed
2225 * @ESsetG0: ESC ( parsed
2226 * @ESsetG1: ESC ) parsed
2227 * @ESpercent: ESC % parsed
2228 * @EScsiignore: CSI [0x20-0x3f] parsed
2229 * @ESnonstd: OSC parsed
2230 * @ESpalette: OSC P parsed
2231 * @ESosc: OSC [0-9] parsed
2232 * @ESANSI_first: first state for ignoring ansi control sequences
2233 * @ESapc: ESC _ parsed
2234 * @ESpm: ESC ^ parsed
2235 * @ESdcs: ESC P parsed
2236 * @ESANSI_last: last state for ignoring ansi control sequences
2237 */
2238enum vc_ctl_state {
2239 ESnormal,
2240 ESesc,
2241 ESsquare,
2242 ESgetpars,
2243 ESgetsubpars,
2244 ESfunckey,
2245 EShash,
2246 ESsetG0,
2247 ESsetG1,
2248 ESpercent,
2249 EScsiignore,
2250 ESnonstd,
2251 ESpalette,
2252 ESosc,
2253 ESANSI_first = ESosc,
2254 ESapc,
2255 ESpm,
2256 ESdcs,
2257 ESANSI_last = ESdcs,
2258};
2259
2260/* console_lock is held (except via vc_init()) */
2261static void reset_terminal(struct vc_data *vc, int do_clear)
2262{
2263 unsigned int i;
2264
2265 vc->vc_top = 0;
2266 vc->vc_bottom = vc->vc_rows;
2267 vc->vc_state = ESnormal;
2268 vc->vc_priv = EPecma;
2269 vc->vc_translate = set_translate(LAT1_MAP, vc);
2270 vc->state.Gx_charset[0] = LAT1_MAP;
2271 vc->state.Gx_charset[1] = GRAF_MAP;
2272 vc->state.charset = 0;
2273 vc->vc_need_wrap = 0;
2274 vc->vc_report_mouse = 0;
2275 vc->vc_bracketed_paste = 0;
2276 vc->vc_utf = default_utf8;
2277 vc->vc_utf_count = 0;
2278
2279 vc->vc_disp_ctrl = 0;
2280 vc->vc_toggle_meta = 0;
2281
2282 vc->vc_decscnm = 0;
2283 vc->vc_decom = 0;
2284 vc->vc_decawm = 1;
2285 vc->vc_deccm = global_cursor_default;
2286 vc->vc_decim = 0;
2287
2288 if (vc->vc_saved_screen != NULL) {
2289 kfree(vc->vc_saved_screen);
2290 vc->vc_saved_screen = NULL;
2291 vc_uniscr_free(vc->vc_saved_uni_lines);
2292 vc->vc_saved_uni_lines = NULL;
2293 vc->vc_saved_rows = 0;
2294 vc->vc_saved_cols = 0;
2295 }
2296
2297 vt_reset_keyboard(vc->vc_num);
2298
2299 vc->vc_cursor_type = cur_default;
2300 vc->vc_complement_mask = vc->vc_s_complement_mask;
2301
2302 default_attr(vc);
2303 update_attr(vc);
2304
2305 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2306 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2307 set_bit(i, vc->vc_tab_stop);
2308
2309 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2310 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2311 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2312
2313 gotoxy(vc, 0, 0);
2314 save_cur(vc);
2315 if (do_clear)
2316 csi_J(vc, CSI_J_VISIBLE);
2317}
2318
2319static void vc_setGx(struct vc_data *vc, unsigned int which, u8 c)
2320{
2321 unsigned char *charset = &vc->state.Gx_charset[which];
2322
2323 switch (c) {
2324 case '0':
2325 *charset = GRAF_MAP;
2326 break;
2327 case 'B':
2328 *charset = LAT1_MAP;
2329 break;
2330 case 'U':
2331 *charset = IBMPC_MAP;
2332 break;
2333 case 'K':
2334 *charset = USER_MAP;
2335 break;
2336 }
2337
2338 if (vc->state.charset == which)
2339 vc->vc_translate = set_translate(*charset, vc);
2340}
2341
2342static bool ansi_control_string(enum vc_ctl_state state)
2343{
2344 return state >= ESANSI_first && state <= ESANSI_last;
2345}
2346
2347enum {
2348 ASCII_NULL = 0,
2349 ASCII_BELL = 7,
2350 ASCII_BACKSPACE = 8,
2351 ASCII_IGNORE_FIRST = ASCII_BACKSPACE,
2352 ASCII_HTAB = 9,
2353 ASCII_LINEFEED = 10,
2354 ASCII_VTAB = 11,
2355 ASCII_FORMFEED = 12,
2356 ASCII_CAR_RET = 13,
2357 ASCII_IGNORE_LAST = ASCII_CAR_RET,
2358 ASCII_SHIFTOUT = 14,
2359 ASCII_SHIFTIN = 15,
2360 ASCII_CANCEL = 24,
2361 ASCII_SUBSTITUTE = 26,
2362 ASCII_ESCAPE = 27,
2363 ASCII_CSI_IGNORE_FIRST = ' ', /* 0x2x, 0x3a and 0x3c - 0x3f */
2364 ASCII_CSI_IGNORE_LAST = '?',
2365 ASCII_DEL = 127,
2366 ASCII_EXT_CSI = 128 + ASCII_ESCAPE,
2367};
2368
2369/*
2370 * Handle ascii characters in control sequences and change states accordingly.
2371 * E.g. ESC sets the state of vc to ESesc.
2372 *
2373 * Returns: true if @c handled.
2374 */
2375static bool handle_ascii(struct tty_struct *tty, struct vc_data *vc, u8 c)
2376{
2377 switch (c) {
2378 case ASCII_NULL:
2379 return true;
2380 case ASCII_BELL:
2381 if (ansi_control_string(vc->vc_state))
2382 vc->vc_state = ESnormal;
2383 else if (vc->vc_bell_duration)
2384 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2385 return true;
2386 case ASCII_BACKSPACE:
2387 bs(vc);
2388 return true;
2389 case ASCII_HTAB:
2390 vc->vc_pos -= (vc->state.x << 1);
2391
2392 vc->state.x = find_next_bit(vc->vc_tab_stop,
2393 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2394 vc->state.x + 1);
2395 if (vc->state.x >= VC_TABSTOPS_COUNT)
2396 vc->state.x = vc->vc_cols - 1;
2397
2398 vc->vc_pos += (vc->state.x << 1);
2399 notify_write(vc, '\t');
2400 return true;
2401 case ASCII_LINEFEED:
2402 case ASCII_VTAB:
2403 case ASCII_FORMFEED:
2404 lf(vc);
2405 if (!is_kbd(vc, lnm))
2406 return true;
2407 fallthrough;
2408 case ASCII_CAR_RET:
2409 cr(vc);
2410 return true;
2411 case ASCII_SHIFTOUT:
2412 vc->state.charset = 1;
2413 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
2414 vc->vc_disp_ctrl = 1;
2415 return true;
2416 case ASCII_SHIFTIN:
2417 vc->state.charset = 0;
2418 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
2419 vc->vc_disp_ctrl = 0;
2420 return true;
2421 case ASCII_CANCEL:
2422 case ASCII_SUBSTITUTE:
2423 vc->vc_state = ESnormal;
2424 return true;
2425 case ASCII_ESCAPE:
2426 vc->vc_state = ESesc;
2427 return true;
2428 case ASCII_DEL:
2429 del(vc);
2430 return true;
2431 case ASCII_EXT_CSI:
2432 vc->vc_state = ESsquare;
2433 return true;
2434 }
2435
2436 return false;
2437}
2438
2439/*
2440 * Handle a character (@c) following an ESC (when @vc is in the ESesc state).
2441 * E.g. previous ESC with @c == '[' here yields the ESsquare state (that is:
2442 * CSI).
2443 */
2444static void handle_esc(struct tty_struct *tty, struct vc_data *vc, u8 c)
2445{
2446 vc->vc_state = ESnormal;
2447 switch (c) {
2448 case '[':
2449 vc->vc_state = ESsquare;
2450 break;
2451 case ']':
2452 vc->vc_state = ESnonstd;
2453 break;
2454 case '_':
2455 vc->vc_state = ESapc;
2456 break;
2457 case '^':
2458 vc->vc_state = ESpm;
2459 break;
2460 case '%':
2461 vc->vc_state = ESpercent;
2462 break;
2463 case 'E':
2464 cr(vc);
2465 lf(vc);
2466 break;
2467 case 'M':
2468 ri(vc);
2469 break;
2470 case 'D':
2471 lf(vc);
2472 break;
2473 case 'H':
2474 if (vc->state.x < VC_TABSTOPS_COUNT)
2475 set_bit(vc->state.x, vc->vc_tab_stop);
2476 break;
2477 case 'P':
2478 vc->vc_state = ESdcs;
2479 break;
2480 case 'Z':
2481 respond_ID(tty);
2482 break;
2483 case '7':
2484 save_cur(vc);
2485 break;
2486 case '8':
2487 restore_cur(vc);
2488 break;
2489 case '(':
2490 vc->vc_state = ESsetG0;
2491 break;
2492 case ')':
2493 vc->vc_state = ESsetG1;
2494 break;
2495 case '#':
2496 vc->vc_state = EShash;
2497 break;
2498 case 'c':
2499 reset_terminal(vc, 1);
2500 break;
2501 case '>': /* Numeric keypad */
2502 clr_kbd(vc, kbdapplic);
2503 break;
2504 case '=': /* Appl. keypad */
2505 set_kbd(vc, kbdapplic);
2506 break;
2507 }
2508}
2509
2510/*
2511 * Handle special DEC control sequences ("ESC [ ? parameters char"). Parameters
2512 * are in @vc->vc_par and the char is in @c here.
2513 */
2514static void csi_DEC(struct tty_struct *tty, struct vc_data *vc, u8 c)
2515{
2516 switch (c) {
2517 case 'h':
2518 csi_DEC_hl(vc, true);
2519 break;
2520 case 'l':
2521 csi_DEC_hl(vc, false);
2522 break;
2523 case 'c':
2524 if (vc->vc_par[0])
2525 vc->vc_cursor_type = CUR_MAKE(vc->vc_par[0],
2526 vc->vc_par[1],
2527 vc->vc_par[2]);
2528 else
2529 vc->vc_cursor_type = cur_default;
2530 break;
2531 case 'm':
2532 clear_selection();
2533 if (vc->vc_par[0])
2534 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2535 else
2536 vc->vc_complement_mask = vc->vc_s_complement_mask;
2537 break;
2538 case 'n':
2539 if (vc->vc_par[0] == 5)
2540 status_report(tty);
2541 else if (vc->vc_par[0] == 6)
2542 cursor_report(vc, tty);
2543 break;
2544 }
2545}
2546
2547/*
2548 * Handle Control Sequence Introducer control characters. That is
2549 * "ESC [ parameters char". Parameters are in @vc->vc_par and the char is in
2550 * @c here.
2551 */
2552static void csi_ECMA(struct tty_struct *tty, struct vc_data *vc, u8 c)
2553{
2554 switch (c) {
2555 case 'G':
2556 case '`':
2557 if (vc->vc_par[0])
2558 vc->vc_par[0]--;
2559 gotoxy(vc, vc->vc_par[0], vc->state.y);
2560 break;
2561 case 'A':
2562 if (!vc->vc_par[0])
2563 vc->vc_par[0]++;
2564 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
2565 break;
2566 case 'B':
2567 case 'e':
2568 if (!vc->vc_par[0])
2569 vc->vc_par[0]++;
2570 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
2571 break;
2572 case 'C':
2573 case 'a':
2574 if (!vc->vc_par[0])
2575 vc->vc_par[0]++;
2576 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
2577 break;
2578 case 'D':
2579 if (!vc->vc_par[0])
2580 vc->vc_par[0]++;
2581 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
2582 break;
2583 case 'E':
2584 if (!vc->vc_par[0])
2585 vc->vc_par[0]++;
2586 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
2587 break;
2588 case 'F':
2589 if (!vc->vc_par[0])
2590 vc->vc_par[0]++;
2591 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
2592 break;
2593 case 'd':
2594 if (vc->vc_par[0])
2595 vc->vc_par[0]--;
2596 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
2597 break;
2598 case 'H':
2599 case 'f':
2600 if (vc->vc_par[0])
2601 vc->vc_par[0]--;
2602 if (vc->vc_par[1])
2603 vc->vc_par[1]--;
2604 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2605 break;
2606 case 'J':
2607 csi_J(vc, vc->vc_par[0]);
2608 break;
2609 case 'K':
2610 csi_K(vc);
2611 break;
2612 case 'L':
2613 csi_L(vc);
2614 break;
2615 case 'M':
2616 csi_M(vc);
2617 break;
2618 case 'P':
2619 csi_P(vc);
2620 break;
2621 case 'c':
2622 if (!vc->vc_par[0])
2623 respond_ID(tty);
2624 break;
2625 case 'g':
2626 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2627 set_bit(vc->state.x, vc->vc_tab_stop);
2628 else if (vc->vc_par[0] == 3)
2629 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2630 break;
2631 case 'h':
2632 csi_hl(vc, true);
2633 break;
2634 case 'l':
2635 csi_hl(vc, false);
2636 break;
2637 case 'm':
2638 csi_m(vc);
2639 break;
2640 case 'n':
2641 if (vc->vc_par[0] == 5)
2642 status_report(tty);
2643 else if (vc->vc_par[0] == 6)
2644 cursor_report(vc, tty);
2645 break;
2646 case 'q': /* DECLL - but only 3 leds */
2647 /* map 0,1,2,3 to 0,1,2,4 */
2648 if (vc->vc_par[0] < 4)
2649 vt_set_led_state(vc->vc_num,
2650 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2651 break;
2652 case 'r':
2653 if (!vc->vc_par[0])
2654 vc->vc_par[0]++;
2655 if (!vc->vc_par[1])
2656 vc->vc_par[1] = vc->vc_rows;
2657 /* Minimum allowed region is 2 lines */
2658 if (vc->vc_par[0] < vc->vc_par[1] &&
2659 vc->vc_par[1] <= vc->vc_rows) {
2660 vc->vc_top = vc->vc_par[0] - 1;
2661 vc->vc_bottom = vc->vc_par[1];
2662 gotoxay(vc, 0, 0);
2663 }
2664 break;
2665 case 's':
2666 save_cur(vc);
2667 break;
2668 case 'u':
2669 restore_cur(vc);
2670 break;
2671 case 'X':
2672 csi_X(vc);
2673 break;
2674 case '@':
2675 csi_at(vc, vc->vc_par[0]);
2676 break;
2677 case ']':
2678 csi_RSB(vc);
2679 break;
2680 }
2681
2682}
2683
2684static void vc_reset_params(struct vc_data *vc)
2685{
2686 memset(vc->vc_par, 0, sizeof(vc->vc_par));
2687 vc->vc_npar = 0;
2688}
2689
2690/* console_lock is held */
2691static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
2692{
2693 /*
2694 * Control characters can be used in the _middle_
2695 * of an escape sequence, aside from ANSI control strings.
2696 */
2697 if (ansi_control_string(vc->vc_state) && c >= ASCII_IGNORE_FIRST &&
2698 c <= ASCII_IGNORE_LAST)
2699 return;
2700
2701 if (handle_ascii(tty, vc, c))
2702 return;
2703
2704 switch(vc->vc_state) {
2705 case ESesc: /* ESC */
2706 handle_esc(tty, vc, c);
2707 return;
2708 case ESnonstd: /* ESC ] aka OSC */
2709 switch (c) {
2710 case 'P': /* palette escape sequence */
2711 vc_reset_params(vc);
2712 vc->vc_state = ESpalette;
2713 return;
2714 case 'R': /* reset palette */
2715 reset_palette(vc);
2716 break;
2717 case '0' ... '9':
2718 vc->vc_state = ESosc;
2719 return;
2720 }
2721 vc->vc_state = ESnormal;
2722 return;
2723 case ESpalette: /* ESC ] P aka OSC P */
2724 if (isxdigit(c)) {
2725 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2726 if (vc->vc_npar == 7) {
2727 int i = vc->vc_par[0] * 3, j = 1;
2728 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2729 vc->vc_palette[i++] += vc->vc_par[j++];
2730 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2731 vc->vc_palette[i++] += vc->vc_par[j++];
2732 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2733 vc->vc_palette[i] += vc->vc_par[j];
2734 set_palette(vc);
2735 vc->vc_state = ESnormal;
2736 }
2737 } else
2738 vc->vc_state = ESnormal;
2739 return;
2740 case ESsquare: /* ESC [ aka CSI, parameters or modifiers expected */
2741 vc_reset_params(vc);
2742
2743 vc->vc_state = ESgetpars;
2744 switch (c) {
2745 case '[': /* Function key */
2746 vc->vc_state = ESfunckey;
2747 return;
2748 case '?':
2749 vc->vc_priv = EPdec;
2750 return;
2751 case '>':
2752 vc->vc_priv = EPgt;
2753 return;
2754 case '=':
2755 vc->vc_priv = EPeq;
2756 return;
2757 case '<':
2758 vc->vc_priv = EPlt;
2759 return;
2760 }
2761 vc->vc_priv = EPecma;
2762 fallthrough;
2763 case ESgetpars: /* ESC [ aka CSI, parameters expected */
2764 switch (c) {
2765 case ':': /* ITU-T T.416 color subparameters */
2766 if (vc->vc_par[vc->vc_npar] == CSI_m_FG_COLOR ||
2767 vc->vc_par[vc->vc_npar] == CSI_m_BG_COLOR ||
2768 vc->vc_par[vc->vc_npar] == CSI_m_UNDERLINE_COLOR)
2769 vc->vc_state = ESgetsubpars;
2770 else
2771 break;
2772 fallthrough;
2773 case ';':
2774 if (vc->vc_npar < NPAR - 1) {
2775 vc->vc_npar++;
2776 return;
2777 }
2778 break;
2779 case '0' ... '9':
2780 vc->vc_par[vc->vc_npar] *= 10;
2781 vc->vc_par[vc->vc_npar] += c - '0';
2782 return;
2783 }
2784 if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST) {
2785 vc->vc_state = EScsiignore;
2786 return;
2787 }
2788
2789 /* parameters done, handle the control char @c */
2790
2791 vc->vc_state = ESnormal;
2792
2793 switch (vc->vc_priv) {
2794 case EPdec:
2795 csi_DEC(tty, vc, c);
2796 return;
2797 case EPecma:
2798 csi_ECMA(tty, vc, c);
2799 return;
2800 default:
2801 return;
2802 }
2803 case ESgetsubpars: /* ESC [ 38/48/58, subparameters expected */
2804 switch (c) {
2805 case ':':
2806 case ';':
2807 if (vc->vc_npar < NPAR - 1) {
2808 vc->vc_npar++;
2809 return;
2810 }
2811 break;
2812 case '0' ... '9':
2813 vc->vc_par[vc->vc_npar] *= 10;
2814 vc->vc_par[vc->vc_npar] += c - '0';
2815 return;
2816 }
2817 if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST) {
2818 vc->vc_state = EScsiignore;
2819 return;
2820 }
2821
2822 /* parameters done, handle the control char @c */
2823
2824 vc->vc_state = ESnormal;
2825
2826 switch (vc->vc_priv) {
2827 case EPdec:
2828 csi_DEC(tty, vc, c);
2829 return;
2830 case EPecma:
2831 csi_ECMA(tty, vc, c);
2832 return;
2833 default:
2834 return;
2835 }
2836 case EScsiignore:
2837 if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST)
2838 return;
2839 vc->vc_state = ESnormal;
2840 return;
2841 case ESpercent: /* ESC % */
2842 vc->vc_state = ESnormal;
2843 switch (c) {
2844 case '@': /* defined in ISO 2022 */
2845 vc->vc_utf = 0;
2846 return;
2847 case 'G': /* prelim official escape code */
2848 case '8': /* retained for compatibility */
2849 vc->vc_utf = 1;
2850 return;
2851 }
2852 return;
2853 case ESfunckey: /* ESC [ [ aka CSI [ */
2854 vc->vc_state = ESnormal;
2855 return;
2856 case EShash: /* ESC # */
2857 vc->vc_state = ESnormal;
2858 if (c == '8') {
2859 /* DEC screen alignment test. kludge :-) */
2860 vc->vc_video_erase_char =
2861 (vc->vc_video_erase_char & 0xff00) | 'E';
2862 csi_J(vc, CSI_J_VISIBLE);
2863 vc->vc_video_erase_char =
2864 (vc->vc_video_erase_char & 0xff00) | ' ';
2865 if (con_should_update(vc))
2866 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2867 }
2868 return;
2869 case ESsetG0: /* ESC ( */
2870 vc_setGx(vc, 0, c);
2871 vc->vc_state = ESnormal;
2872 return;
2873 case ESsetG1: /* ESC ) */
2874 vc_setGx(vc, 1, c);
2875 vc->vc_state = ESnormal;
2876 return;
2877 case ESapc: /* ESC _ */
2878 return;
2879 case ESosc: /* ESC ] [0-9] aka OSC [0-9] */
2880 return;
2881 case ESpm: /* ESC ^ */
2882 return;
2883 case ESdcs: /* ESC P */
2884 return;
2885 default:
2886 vc->vc_state = ESnormal;
2887 }
2888}
2889
2890struct vc_draw_region {
2891 unsigned long from, to;
2892 int x;
2893};
2894
2895static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2896{
2897 if (draw->x < 0)
2898 return;
2899
2900 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2901 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2902 draw->x);
2903 draw->x = -1;
2904}
2905
2906static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2907{
2908 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2909 if (vc->vc_toggle_meta)
2910 c |= 0x80;
2911
2912 return vc->vc_translate[c];
2913 }
2914
2915 return c;
2916}
2917
2918
2919/**
2920 * vc_sanitize_unicode - Replace invalid Unicode code points with ``U+FFFD``
2921 * @c: the received code point
2922 */
2923static inline int vc_sanitize_unicode(const int c)
2924{
2925 if (c >= 0xd800 && c <= 0xdfff)
2926 return 0xfffd;
2927
2928 return c;
2929}
2930
2931/**
2932 * vc_translate_unicode - Combine UTF-8 into Unicode in &vc_data.vc_utf_char
2933 * @vc: virtual console
2934 * @c: UTF-8 byte to translate
2935 * @rescan: set to true iff @c wasn't consumed here and needs to be re-processed
2936 *
2937 * * &vc_data.vc_utf_char is the being-constructed Unicode code point.
2938 * * &vc_data.vc_utf_count is the number of continuation bytes still expected to
2939 * arrive.
2940 * * &vc_data.vc_npar is the number of continuation bytes arrived so far.
2941 *
2942 * Return:
2943 * * %-1 - Input OK so far, @c consumed, further bytes expected.
2944 * * %0xFFFD - Possibility 1: input invalid, @c may have been consumed (see
2945 * desc. of @rescan). Possibility 2: input OK, @c consumed,
2946 * ``U+FFFD`` is the resulting code point. ``U+FFFD`` is valid,
2947 * ``REPLACEMENT CHARACTER``.
2948 * * otherwise - Input OK, @c consumed, resulting code point returned.
2949 */
2950static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2951{
2952 static const u32 utf8_length_changes[] = {0x7f, 0x7ff, 0xffff, 0x10ffff};
2953
2954 /* Continuation byte received */
2955 if ((c & 0xc0) == 0x80) {
2956 /* Unexpected continuation byte? */
2957 if (!vc->vc_utf_count)
2958 goto bad_sequence;
2959
2960 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2961 vc->vc_npar++;
2962 if (--vc->vc_utf_count)
2963 goto need_more_bytes;
2964
2965 /* Got a whole character */
2966 c = vc->vc_utf_char;
2967 /* Reject overlong sequences */
2968 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2969 c > utf8_length_changes[vc->vc_npar])
2970 goto bad_sequence;
2971
2972 return vc_sanitize_unicode(c);
2973 }
2974
2975 /* Single ASCII byte or first byte of a sequence received */
2976 if (vc->vc_utf_count) {
2977 /* A continuation byte was expected */
2978 *rescan = true;
2979 vc->vc_utf_count = 0;
2980 goto bad_sequence;
2981 }
2982
2983 /* Nothing to do if an ASCII byte was received */
2984 if (c <= 0x7f)
2985 return c;
2986
2987 /* First byte of a multibyte sequence received */
2988 vc->vc_npar = 0;
2989 if ((c & 0xe0) == 0xc0) {
2990 vc->vc_utf_count = 1;
2991 vc->vc_utf_char = (c & 0x1f);
2992 } else if ((c & 0xf0) == 0xe0) {
2993 vc->vc_utf_count = 2;
2994 vc->vc_utf_char = (c & 0x0f);
2995 } else if ((c & 0xf8) == 0xf0) {
2996 vc->vc_utf_count = 3;
2997 vc->vc_utf_char = (c & 0x07);
2998 } else {
2999 goto bad_sequence;
3000 }
3001
3002need_more_bytes:
3003 return -1;
3004
3005bad_sequence:
3006 return 0xfffd;
3007}
3008
3009static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
3010{
3011 /* Do no translation at all in control states */
3012 if (vc->vc_state != ESnormal)
3013 return *c;
3014
3015 if (vc->vc_utf && !vc->vc_disp_ctrl)
3016 return *c = vc_translate_unicode(vc, *c, rescan);
3017
3018 /* no utf or alternate charset mode */
3019 return vc_translate_ascii(vc, *c);
3020}
3021
3022static inline unsigned char vc_invert_attr(const struct vc_data *vc)
3023{
3024 if (!vc->vc_can_do_color)
3025 return vc->vc_attr ^ 0x08;
3026
3027 if (vc->vc_hi_font_mask == 0x100)
3028 return (vc->vc_attr & 0x11) |
3029 ((vc->vc_attr & 0xe0) >> 4) |
3030 ((vc->vc_attr & 0x0e) << 4);
3031
3032 return (vc->vc_attr & 0x88) |
3033 ((vc->vc_attr & 0x70) >> 4) |
3034 ((vc->vc_attr & 0x07) << 4);
3035}
3036
3037static bool vc_is_control(struct vc_data *vc, int tc, int c)
3038{
3039 /*
3040 * A bitmap for codes <32. A bit of 1 indicates that the code
3041 * corresponding to that bit number invokes some special action (such
3042 * as cursor movement) and should not be displayed as a glyph unless
3043 * the disp_ctrl mode is explicitly enabled.
3044 */
3045 static const u32 CTRL_ACTION = BIT(ASCII_NULL) |
3046 GENMASK(ASCII_SHIFTIN, ASCII_BELL) | BIT(ASCII_CANCEL) |
3047 BIT(ASCII_SUBSTITUTE) | BIT(ASCII_ESCAPE);
3048 /* Cannot be overridden by disp_ctrl */
3049 static const u32 CTRL_ALWAYS = BIT(ASCII_NULL) | BIT(ASCII_BACKSPACE) |
3050 BIT(ASCII_LINEFEED) | BIT(ASCII_SHIFTIN) | BIT(ASCII_SHIFTOUT) |
3051 BIT(ASCII_CAR_RET) | BIT(ASCII_FORMFEED) | BIT(ASCII_ESCAPE);
3052
3053 if (vc->vc_state != ESnormal)
3054 return true;
3055
3056 if (!tc)
3057 return true;
3058
3059 /*
3060 * If the original code was a control character we only allow a glyph
3061 * to be displayed if the code is not normally used (such as for cursor
3062 * movement) or if the disp_ctrl mode has been explicitly enabled.
3063 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
3064 * displayed as control characters, as the console would be pretty
3065 * useless without them; to display an arbitrary font position use the
3066 * direct-to-font zone in UTF-8 mode.
3067 */
3068 if (c < BITS_PER_TYPE(CTRL_ALWAYS)) {
3069 if (vc->vc_disp_ctrl)
3070 return CTRL_ALWAYS & BIT(c);
3071 else
3072 return vc->vc_utf || (CTRL_ACTION & BIT(c));
3073 }
3074
3075 if (c == ASCII_DEL && !vc->vc_disp_ctrl)
3076 return true;
3077
3078 if (c == ASCII_EXT_CSI)
3079 return true;
3080
3081 return false;
3082}
3083
3084static void vc_con_rewind(struct vc_data *vc)
3085{
3086 if (vc->state.x && !vc->vc_need_wrap) {
3087 vc->vc_pos -= 2;
3088 vc->state.x--;
3089 }
3090 vc->vc_need_wrap = 0;
3091}
3092
3093#define UCS_ZWS 0x200b /* Zero Width Space */
3094#define UCS_VS16 0xfe0f /* Variation Selector 16 */
3095#define UCS_REPLACEMENT 0xfffd /* Replacement Character */
3096
3097static int vc_process_ucs(struct vc_data *vc, int *c, int *tc)
3098{
3099 u32 prev_c, curr_c = *c;
3100 unsigned int w = ucs_get_width(curr_c);
3101
3102 if (likely(w == 1))
3103 return 1;
3104
3105 if (w == 2) {
3106 /*
3107 * The Unicode screen memory is allocated only when
3108 * required. This is one such case as we need to remember
3109 * which displayed characters are double-width.
3110 */
3111 vc_uniscr_check(vc);
3112 return 2;
3113 }
3114
3115 /* From here curr_c is known to be zero-width. */
3116
3117 if (ucs_get_width(vc_uniscr_getc(vc, -2)) == 2) {
3118 /*
3119 * Let's merge this zero-width code point with the preceding
3120 * double-width code point by replacing the existing
3121 * zero-width space padding. To do so we rewind one column
3122 * and pretend this has a width of 1.
3123 * We give the legacy display the same initial space padding.
3124 */
3125 vc_con_rewind(vc);
3126 *tc = ' ';
3127 return 1;
3128 }
3129
3130 /* From here the preceding character, if any, must be single-width. */
3131 prev_c = vc_uniscr_getc(vc, -1);
3132
3133 if (curr_c == UCS_VS16 && prev_c != 0) {
3134 /*
3135 * VS16 (U+FE0F) is special. It typically turns the preceding
3136 * single-width character into a double-width one. Let it
3137 * have a width of 1 effectively making the combination with
3138 * the preceding character double-width.
3139 */
3140 *tc = ' ';
3141 return 1;
3142 }
3143
3144 /* try recomposition */
3145 prev_c = ucs_recompose(prev_c, curr_c);
3146 if (prev_c != 0) {
3147 vc_con_rewind(vc);
3148 *tc = *c = prev_c;
3149 return 1;
3150 }
3151
3152 /* Otherwise zero-width code points are ignored. */
3153 return 0;
3154}
3155
3156static int vc_get_glyph(struct vc_data *vc, int tc)
3157{
3158 int glyph = conv_uni_to_pc(vc, tc);
3159 u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
3160
3161 if (!(glyph & ~charmask))
3162 return glyph;
3163
3164 if (glyph == -1)
3165 return -1; /* nothing to display */
3166
3167 /* Glyph not found */
3168 if ((!vc->vc_utf || vc->vc_disp_ctrl || tc < 128) && !(tc & ~charmask)) {
3169 /*
3170 * In legacy mode use the glyph we get by a 1:1 mapping.
3171 * This would make absolutely no sense with Unicode in mind, but do this for
3172 * ASCII characters since a font may lack Unicode mapping info and we don't
3173 * want to end up with having question marks only.
3174 */
3175 return tc;
3176 }
3177
3178 /*
3179 * The Unicode screen memory is allocated only when required.
3180 * This is one such case: we're about to "cheat" with the displayed
3181 * character meaning the simple screen buffer won't hold the original
3182 * information, whereas the Unicode screen buffer always does.
3183 */
3184 vc_uniscr_check(vc);
3185
3186 /* Try getting a simpler fallback character. */
3187 tc = ucs_get_fallback(tc);
3188 if (tc)
3189 return vc_get_glyph(vc, tc);
3190
3191 /* Display U+FFFD (Unicode Replacement Character). */
3192 return conv_uni_to_pc(vc, UCS_REPLACEMENT);
3193}
3194
3195static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
3196 struct vc_draw_region *draw)
3197{
3198 int next_c;
3199 unsigned char vc_attr = vc->vc_attr;
3200 u16 himask = vc->vc_hi_font_mask;
3201 u8 width = 1;
3202 bool inverse = false;
3203
3204 if (vc->vc_utf && !vc->vc_disp_ctrl) {
3205 width = vc_process_ucs(vc, &c, &tc);
3206 if (!width)
3207 goto out;
3208 }
3209
3210 /* Now try to find out how to display it */
3211 tc = vc_get_glyph(vc, tc);
3212 if (tc == -1)
3213 return -1; /* nothing to display */
3214 if (tc < 0) {
3215 inverse = true;
3216 tc = conv_uni_to_pc(vc, '?');
3217 if (tc < 0)
3218 tc = '?';
3219
3220 vc_attr = vc_invert_attr(vc);
3221 con_flush(vc, draw);
3222 }
3223
3224 next_c = c;
3225 while (1) {
3226 if (vc->vc_need_wrap || vc->vc_decim)
3227 con_flush(vc, draw);
3228 if (vc->vc_need_wrap) {
3229 cr(vc);
3230 lf(vc);
3231 }
3232 if (vc->vc_decim)
3233 insert_char(vc, 1);
3234 vc_uniscr_putc(vc, next_c);
3235
3236 if (himask)
3237 tc = ((tc & 0x100) ? himask : 0) |
3238 (tc & 0xff);
3239 tc |= (vc_attr << 8) & ~himask;
3240
3241 scr_writew(tc, (u16 *)vc->vc_pos);
3242
3243 if (con_should_update(vc) && draw->x < 0) {
3244 draw->x = vc->state.x;
3245 draw->from = vc->vc_pos;
3246 }
3247 if (vc->state.x == vc->vc_cols - 1) {
3248 vc->vc_need_wrap = vc->vc_decawm;
3249 draw->to = vc->vc_pos + 2;
3250 } else {
3251 vc->state.x++;
3252 draw->to = (vc->vc_pos += 2);
3253 }
3254
3255 if (!--width)
3256 break;
3257
3258 /* A space is printed in the second column */
3259 tc = conv_uni_to_pc(vc, ' ');
3260 if (tc < 0)
3261 tc = ' ';
3262 /*
3263 * Store a zero-width space in the Unicode screen given that
3264 * the previous code point is semantically double width.
3265 */
3266 next_c = UCS_ZWS;
3267 }
3268
3269out:
3270 notify_write(vc, c);
3271
3272 if (inverse)
3273 con_flush(vc, draw);
3274
3275 return 0;
3276}
3277
3278/* acquires console_lock */
3279static int do_con_write(struct tty_struct *tty, const u8 *buf, int count)
3280{
3281 struct vc_draw_region draw = {
3282 .x = -1,
3283 };
3284 int c, tc, n = 0;
3285 unsigned int currcons;
3286 struct vc_data *vc = tty->driver_data;
3287 struct vt_notifier_param param;
3288 bool rescan;
3289
3290 if (in_interrupt())
3291 return count;
3292
3293 guard(console_lock)();
3294 currcons = vc->vc_num;
3295 if (!vc_cons_allocated(currcons)) {
3296 /* could this happen? */
3297 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
3298 return 0;
3299 }
3300
3301
3302 /* undraw cursor first */
3303 if (con_is_fg(vc))
3304 hide_cursor(vc);
3305
3306 param.vc = vc;
3307
3308 while (!tty->flow.stopped && count) {
3309 u8 orig = *buf;
3310 buf++;
3311 n++;
3312 count--;
3313rescan_last_byte:
3314 c = orig;
3315 rescan = false;
3316
3317 tc = vc_translate(vc, &c, &rescan);
3318 if (tc == -1)
3319 continue;
3320
3321 param.c = tc;
3322 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
3323 &param) == NOTIFY_STOP)
3324 continue;
3325
3326 if (vc_is_control(vc, tc, c)) {
3327 con_flush(vc, &draw);
3328 do_con_trol(tty, vc, orig);
3329 continue;
3330 }
3331
3332 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
3333 continue;
3334
3335 if (rescan)
3336 goto rescan_last_byte;
3337 }
3338 con_flush(vc, &draw);
3339 notify_update(vc);
3340
3341 return n;
3342}
3343
3344/*
3345 * This is the console switching callback.
3346 *
3347 * Doing console switching in a process context allows
3348 * us to do the switches asynchronously (needed when we want
3349 * to switch due to a keyboard interrupt). Synchronization
3350 * with other console code and prevention of re-entrancy is
3351 * ensured with console_lock.
3352 */
3353static void console_callback(struct work_struct *ignored)
3354{
3355 guard(console_lock)();
3356
3357 if (want_console >= 0) {
3358 if (want_console != fg_console &&
3359 vc_cons_allocated(want_console)) {
3360 hide_cursor(vc_cons[fg_console].d);
3361 change_console(vc_cons[want_console].d);
3362 /* we only changed when the console had already
3363 been allocated - a new console is not created
3364 in an interrupt routine */
3365 }
3366 want_console = -1;
3367 }
3368 if (do_poke_blanked_console) { /* do not unblank for a LED change */
3369 do_poke_blanked_console = 0;
3370 poke_blanked_console();
3371 }
3372 if (scrollback_delta) {
3373 struct vc_data *vc = vc_cons[fg_console].d;
3374 clear_selection();
3375 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
3376 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
3377 scrollback_delta = 0;
3378 }
3379 if (blank_timer_expired) {
3380 do_blank_screen(0);
3381 blank_timer_expired = 0;
3382 }
3383 notify_update(vc_cons[fg_console].d);
3384}
3385
3386int set_console(int nr)
3387{
3388 struct vc_data *vc = vc_cons[fg_console].d;
3389
3390 if (!vc_cons_allocated(nr) || vt_dont_switch ||
3391 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
3392
3393 /*
3394 * Console switch will fail in console_callback() or
3395 * change_console() so there is no point scheduling
3396 * the callback
3397 *
3398 * Existing set_console() users don't check the return
3399 * value so this shouldn't break anything
3400 */
3401 return -EINVAL;
3402 }
3403
3404 want_console = nr;
3405 schedule_console_callback();
3406
3407 return 0;
3408}
3409
3410struct tty_driver *console_driver;
3411
3412#ifdef CONFIG_VT_CONSOLE
3413
3414/**
3415 * vt_kmsg_redirect() - sets/gets the kernel message console
3416 * @new: the new virtual terminal number or -1 if the console should stay
3417 * unchanged
3418 *
3419 * By default, the kernel messages are always printed on the current virtual
3420 * console. However, the user may modify that default with the
3421 * %TIOCL_SETKMSGREDIRECT ioctl call.
3422 *
3423 * This function sets the kernel message console to be @new. It returns the old
3424 * virtual console number. The virtual terminal number %0 (both as parameter and
3425 * return value) means no redirection (i.e. always printed on the currently
3426 * active console).
3427 *
3428 * The parameter -1 means that only the current console is returned, but the
3429 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3430 * case to make the code more understandable.
3431 *
3432 * When the kernel is compiled without %CONFIG_VT_CONSOLE, this function ignores
3433 * the parameter and always returns %0.
3434 */
3435int vt_kmsg_redirect(int new)
3436{
3437 static int kmsg_con;
3438
3439 if (new != -1)
3440 return xchg(&kmsg_con, new);
3441 else
3442 return kmsg_con;
3443}
3444
3445/*
3446 * Console on virtual terminal
3447 *
3448 * The console must be locked when we get here.
3449 */
3450
3451static void vt_console_print(struct console *co, const char *b, unsigned count)
3452{
3453 struct vc_data *vc = vc_cons[fg_console].d;
3454 unsigned char c;
3455 static DEFINE_SPINLOCK(printing_lock);
3456 const ushort *start;
3457 ushort start_x, cnt;
3458 int kmsg_console;
3459
3460 WARN_CONSOLE_UNLOCKED();
3461
3462 /* this protects against concurrent oops only */
3463 if (!spin_trylock(&printing_lock))
3464 return;
3465
3466 kmsg_console = vt_get_kmsg_redirect();
3467 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3468 vc = vc_cons[kmsg_console - 1].d;
3469
3470 if (!vc_cons_allocated(fg_console)) {
3471 /* impossible */
3472 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3473 goto quit;
3474 }
3475
3476 if (vc->vc_mode != KD_TEXT)
3477 goto quit;
3478
3479 /* undraw cursor first */
3480 if (con_is_fg(vc))
3481 hide_cursor(vc);
3482
3483 start = (ushort *)vc->vc_pos;
3484 start_x = vc->state.x;
3485 cnt = 0;
3486 while (count--) {
3487 c = *b++;
3488 if (c == ASCII_LINEFEED || c == ASCII_CAR_RET ||
3489 c == ASCII_BACKSPACE || vc->vc_need_wrap) {
3490 if (cnt && con_is_visible(vc))
3491 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3492 cnt = 0;
3493 if (c == ASCII_BACKSPACE) {
3494 bs(vc);
3495 start = (ushort *)vc->vc_pos;
3496 start_x = vc->state.x;
3497 continue;
3498 }
3499 if (c != ASCII_CAR_RET)
3500 lf(vc);
3501 cr(vc);
3502 start = (ushort *)vc->vc_pos;
3503 start_x = vc->state.x;
3504 if (c == ASCII_LINEFEED || c == ASCII_CAR_RET)
3505 continue;
3506 }
3507 vc_uniscr_putc(vc, c);
3508 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3509 notify_write(vc, c);
3510 cnt++;
3511 if (vc->state.x == vc->vc_cols - 1) {
3512 vc->vc_need_wrap = 1;
3513 } else {
3514 vc->vc_pos += 2;
3515 vc->state.x++;
3516 }
3517 }
3518 if (cnt && con_is_visible(vc))
3519 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3520 set_cursor(vc);
3521 notify_update(vc);
3522
3523quit:
3524 spin_unlock(&printing_lock);
3525}
3526
3527static struct tty_driver *vt_console_device(struct console *c, int *index)
3528{
3529 *index = c->index ? c->index-1 : fg_console;
3530 return console_driver;
3531}
3532
3533static int vt_console_setup(struct console *co, char *options)
3534{
3535 return co->index >= MAX_NR_CONSOLES ? -EINVAL : 0;
3536}
3537
3538static struct console vt_console_driver = {
3539 .name = "tty",
3540 .setup = vt_console_setup,
3541 .write = vt_console_print,
3542 .device = vt_console_device,
3543 .unblank = unblank_screen,
3544 .flags = CON_PRINTBUFFER,
3545 .index = -1,
3546};
3547#endif
3548
3549/*
3550 * Handling of Linux-specific VC ioctls
3551 */
3552
3553/*
3554 * Generally a bit racy with respect to console_lock();.
3555 *
3556 * There are some functions which don't need it.
3557 *
3558 * There are some functions which can sleep for arbitrary periods
3559 * (paste_selection) but we don't need the lock there anyway.
3560 *
3561 * set_selection_user has locking, and definitely needs it
3562 */
3563
3564int tioclinux(struct tty_struct *tty, unsigned long arg)
3565{
3566 char type, data;
3567 char __user *p = (char __user *)arg;
3568 void __user *param_aligned32 = (u32 __user *)arg + 1;
3569 void __user *param = (void __user *)arg + 1;
3570 int lines;
3571 int ret;
3572
3573 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3574 return -EPERM;
3575 if (get_user(type, p))
3576 return -EFAULT;
3577 ret = 0;
3578
3579 switch (type) {
3580 case TIOCL_SETSEL:
3581 return set_selection_user(param, tty);
3582 case TIOCL_PASTESEL:
3583 if (!capable(CAP_SYS_ADMIN))
3584 return -EPERM;
3585 return paste_selection(tty);
3586 case TIOCL_UNBLANKSCREEN:
3587 scoped_guard(console_lock)
3588 unblank_screen();
3589 break;
3590 case TIOCL_SELLOADLUT:
3591 if (!capable(CAP_SYS_ADMIN))
3592 return -EPERM;
3593 return sel_loadlut(param_aligned32);
3594 case TIOCL_GETSHIFTSTATE:
3595 /*
3596 * Make it possible to react to Shift+Mousebutton. Note that
3597 * 'shift_state' is an undocumented kernel-internal variable;
3598 * programs not closely related to the kernel should not use
3599 * this.
3600 */
3601 data = vt_get_shift_state();
3602 return put_user(data, p);
3603 case TIOCL_GETMOUSEREPORTING:
3604 scoped_guard(console_lock) /* May be overkill */
3605 data = mouse_reporting();
3606 return put_user(data, p);
3607 case TIOCL_SETVESABLANK:
3608 return set_vesa_blanking(param);
3609 case TIOCL_GETKMSGREDIRECT:
3610 data = vt_get_kmsg_redirect();
3611 return put_user(data, p);
3612 case TIOCL_SETKMSGREDIRECT:
3613 if (!capable(CAP_SYS_ADMIN))
3614 return -EPERM;
3615
3616 if (get_user(data, p+1))
3617 return -EFAULT;
3618
3619 vt_kmsg_redirect(data);
3620
3621 break;
3622 case TIOCL_GETFGCONSOLE:
3623 /*
3624 * No locking needed as this is a transiently correct return
3625 * anyway if the caller hasn't disabled switching.
3626 */
3627 return fg_console;
3628 case TIOCL_SCROLLCONSOLE:
3629 if (get_user(lines, (s32 __user *)param_aligned32))
3630 return -EFAULT;
3631
3632 /*
3633 * Needs the console lock here. Note that lots of other calls
3634 * need fixing before the lock is actually useful!
3635 */
3636 scoped_guard(console_lock)
3637 scrollfront(vc_cons[fg_console].d, lines);
3638 break;
3639 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3640 scoped_guard(console_lock) {
3641 ignore_poke = 1;
3642 do_blank_screen(0);
3643 }
3644 break;
3645 case TIOCL_BLANKEDSCREEN:
3646 return console_blanked;
3647 case TIOCL_GETBRACKETEDPASTE:
3648 return get_bracketed_paste(tty);
3649 default:
3650 return -EINVAL;
3651 }
3652
3653 return ret;
3654}
3655
3656/*
3657 * /dev/ttyN handling
3658 */
3659
3660static ssize_t con_write(struct tty_struct *tty, const u8 *buf, size_t count)
3661{
3662 int retval;
3663
3664 retval = do_con_write(tty, buf, count);
3665 con_flush_chars(tty);
3666
3667 return retval;
3668}
3669
3670static int con_put_char(struct tty_struct *tty, u8 ch)
3671{
3672 return do_con_write(tty, &ch, 1);
3673}
3674
3675static unsigned int con_write_room(struct tty_struct *tty)
3676{
3677 if (tty->flow.stopped)
3678 return 0;
3679 return 32768; /* No limit, really; we're not buffering */
3680}
3681
3682/*
3683 * con_throttle and con_unthrottle are only used for
3684 * paste_selection(), which has to stuff in a large number of
3685 * characters...
3686 */
3687static void con_throttle(struct tty_struct *tty)
3688{
3689}
3690
3691static void con_unthrottle(struct tty_struct *tty)
3692{
3693 struct vc_data *vc = tty->driver_data;
3694
3695 wake_up_interruptible(&vc->paste_wait);
3696}
3697
3698/*
3699 * Turn the Scroll-Lock LED on when the tty is stopped
3700 */
3701static void con_stop(struct tty_struct *tty)
3702{
3703 int console_num;
3704 if (!tty)
3705 return;
3706 console_num = tty->index;
3707 if (!vc_cons_allocated(console_num))
3708 return;
3709 vt_kbd_con_stop(console_num);
3710}
3711
3712/*
3713 * Turn the Scroll-Lock LED off when the console is started
3714 */
3715static void con_start(struct tty_struct *tty)
3716{
3717 int console_num;
3718 if (!tty)
3719 return;
3720 console_num = tty->index;
3721 if (!vc_cons_allocated(console_num))
3722 return;
3723 vt_kbd_con_start(console_num);
3724}
3725
3726static void con_flush_chars(struct tty_struct *tty)
3727{
3728 struct vc_data *vc = tty->driver_data;
3729
3730 if (in_interrupt()) /* from flush_to_ldisc */
3731 return;
3732
3733 guard(console_lock)();
3734 set_cursor(vc);
3735}
3736
3737/*
3738 * Allocate the console screen memory.
3739 */
3740static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3741{
3742 unsigned int currcons = tty->index;
3743 struct vc_data *vc;
3744 int ret;
3745
3746 guard(console_lock)();
3747 ret = vc_allocate(currcons);
3748 if (ret)
3749 return ret;
3750
3751 vc = vc_cons[currcons].d;
3752
3753 /* Still being freed */
3754 if (vc->port.tty)
3755 return -ERESTARTSYS;
3756
3757 ret = tty_port_install(&vc->port, driver, tty);
3758 if (ret)
3759 return ret;
3760
3761 tty->driver_data = vc;
3762 vc->port.tty = tty;
3763 tty_port_get(&vc->port);
3764
3765 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3766 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3767 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3768 }
3769 if (vc->vc_utf)
3770 tty->termios.c_iflag |= IUTF8;
3771 else
3772 tty->termios.c_iflag &= ~IUTF8;
3773
3774 return 0;
3775}
3776
3777static int con_open(struct tty_struct *tty, struct file *filp)
3778{
3779 /* everything done in install */
3780 return 0;
3781}
3782
3783
3784static void con_close(struct tty_struct *tty, struct file *filp)
3785{
3786 /* Nothing to do - we defer to shutdown */
3787}
3788
3789static void con_shutdown(struct tty_struct *tty)
3790{
3791 struct vc_data *vc = tty->driver_data;
3792 BUG_ON(vc == NULL);
3793
3794 guard(console_lock)();
3795 vc->port.tty = NULL;
3796}
3797
3798static void con_cleanup(struct tty_struct *tty)
3799{
3800 struct vc_data *vc = tty->driver_data;
3801
3802 tty_port_put(&vc->port);
3803}
3804
3805/*
3806 * We can't deal with anything but the N_TTY ldisc,
3807 * because we can sleep in our write() routine.
3808 */
3809static int con_ldisc_ok(struct tty_struct *tty, int ldisc)
3810{
3811 return ldisc == N_TTY ? 0 : -EINVAL;
3812}
3813
3814static int default_color = 7; /* white */
3815static int default_italic_color = 2; // green (ASCII)
3816static int default_underline_color = 3; // cyan (ASCII)
3817module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3818module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3819module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3820
3821static void vc_init(struct vc_data *vc, int do_clear)
3822{
3823 int j, k ;
3824
3825 set_origin(vc);
3826 vc->vc_pos = vc->vc_origin;
3827 reset_vc(vc);
3828 for (j=k=0; j<16; j++) {
3829 vc->vc_palette[k++] = default_red[j] ;
3830 vc->vc_palette[k++] = default_grn[j] ;
3831 vc->vc_palette[k++] = default_blu[j] ;
3832 }
3833 vc->vc_def_color = default_color;
3834 vc->vc_ulcolor = default_underline_color;
3835 vc->vc_itcolor = default_italic_color;
3836 vc->vc_halfcolor = 0x08; /* grey */
3837 init_waitqueue_head(&vc->paste_wait);
3838 reset_terminal(vc, do_clear);
3839}
3840
3841/*
3842 * This routine initializes console interrupts, and does nothing
3843 * else. If you want the screen to clear, call tty_write with
3844 * the appropriate escape-sequence.
3845 */
3846
3847static int __init con_init(void)
3848{
3849 const char *display_desc = NULL;
3850 struct vc_data *vc;
3851 unsigned int currcons = 0, i;
3852
3853 console_lock();
3854
3855 if (!conswitchp)
3856 conswitchp = &dummy_con;
3857 display_desc = conswitchp->con_startup();
3858 if (!display_desc) {
3859 fg_console = 0;
3860 console_unlock();
3861 return 0;
3862 }
3863
3864 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3865 struct con_driver *con_driver = &registered_con_driver[i];
3866
3867 if (con_driver->con == NULL) {
3868 con_driver->con = conswitchp;
3869 con_driver->desc = display_desc;
3870 con_driver->flag = CON_DRIVER_FLAG_INIT;
3871 con_driver->first = 0;
3872 con_driver->last = MAX_NR_CONSOLES - 1;
3873 break;
3874 }
3875 }
3876
3877 for (i = 0; i < MAX_NR_CONSOLES; i++)
3878 con_driver_map[i] = conswitchp;
3879
3880 if (blankinterval) {
3881 blank_state = blank_normal_wait;
3882 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3883 }
3884
3885 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3886 vc_cons[currcons].d = vc = kzalloc_obj(struct vc_data,
3887 GFP_NOWAIT);
3888 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3889 tty_port_init(&vc->port);
3890 visual_init(vc, currcons, true);
3891 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3892 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3893 vc_init(vc, currcons || !vc->vc_sw->con_save_screen);
3894 }
3895 currcons = fg_console = 0;
3896 master_display_fg = vc = vc_cons[currcons].d;
3897 set_origin(vc);
3898 save_screen(vc);
3899 gotoxy(vc, vc->state.x, vc->state.y);
3900 csi_J(vc, CSI_J_CURSOR_TO_END);
3901 update_screen(vc);
3902 pr_info("Console: %s %s %dx%d\n",
3903 vc->vc_can_do_color ? "colour" : "mono",
3904 display_desc, vc->vc_cols, vc->vc_rows);
3905
3906 console_unlock();
3907
3908#ifdef CONFIG_VT_CONSOLE
3909 register_console(&vt_console_driver);
3910#endif
3911 return 0;
3912}
3913console_initcall(con_init);
3914
3915static const struct tty_operations con_ops = {
3916 .install = con_install,
3917 .open = con_open,
3918 .close = con_close,
3919 .write = con_write,
3920 .write_room = con_write_room,
3921 .put_char = con_put_char,
3922 .flush_chars = con_flush_chars,
3923 .ioctl = vt_ioctl,
3924#ifdef CONFIG_COMPAT
3925 .compat_ioctl = vt_compat_ioctl,
3926#endif
3927 .stop = con_stop,
3928 .start = con_start,
3929 .throttle = con_throttle,
3930 .unthrottle = con_unthrottle,
3931 .resize = vt_resize,
3932 .shutdown = con_shutdown,
3933 .cleanup = con_cleanup,
3934 .ldisc_ok = con_ldisc_ok,
3935};
3936
3937static struct cdev vc0_cdev;
3938
3939static ssize_t show_tty_active(struct device *dev,
3940 struct device_attribute *attr, char *buf)
3941{
3942 return sprintf(buf, "tty%d\n", fg_console + 1);
3943}
3944static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3945
3946static struct attribute *vt_dev_attrs[] = {
3947 &dev_attr_active.attr,
3948 NULL
3949};
3950
3951ATTRIBUTE_GROUPS(vt_dev);
3952
3953int __init vty_init(const struct file_operations *console_fops)
3954{
3955 cdev_init(&vc0_cdev, console_fops);
3956 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3957 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3958 panic("Couldn't register /dev/tty0 driver\n");
3959 tty0dev = device_create_with_groups(&tty_class, NULL,
3960 MKDEV(TTY_MAJOR, 0), NULL,
3961 vt_dev_groups, "tty0");
3962 if (IS_ERR(tty0dev))
3963 tty0dev = NULL;
3964
3965 vcs_init();
3966
3967 console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3968 TTY_DRIVER_RESET_TERMIOS);
3969 if (IS_ERR(console_driver))
3970 panic("Couldn't allocate console driver\n");
3971
3972 console_driver->name = "tty";
3973 console_driver->name_base = 1;
3974 console_driver->major = TTY_MAJOR;
3975 console_driver->minor_start = 1;
3976 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3977 console_driver->init_termios = tty_std_termios;
3978 if (default_utf8)
3979 console_driver->init_termios.c_iflag |= IUTF8;
3980 tty_set_operations(console_driver, &con_ops);
3981 if (tty_register_driver(console_driver))
3982 panic("Couldn't register console driver\n");
3983 kbd_init();
3984 console_map_init();
3985 return 0;
3986}
3987
3988static const struct class vtconsole_class = {
3989 .name = "vtconsole",
3990};
3991
3992static int do_bind_con_driver(const struct consw *csw, int first, int last,
3993 int deflt)
3994{
3995 struct module *owner = csw->owner;
3996 const char *desc = NULL;
3997 struct con_driver *con_driver;
3998 int i, j = -1, k = -1, retval = -ENODEV;
3999
4000 if (!try_module_get(owner))
4001 return -ENODEV;
4002
4003 WARN_CONSOLE_UNLOCKED();
4004
4005 /* check if driver is registered */
4006 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4007 con_driver = &registered_con_driver[i];
4008
4009 if (con_driver->con == csw) {
4010 desc = con_driver->desc;
4011 retval = 0;
4012 break;
4013 }
4014 }
4015
4016 if (retval)
4017 goto err;
4018
4019 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
4020 csw->con_startup();
4021 con_driver->flag |= CON_DRIVER_FLAG_INIT;
4022 }
4023
4024 if (deflt) {
4025 if (conswitchp)
4026 module_put(conswitchp->owner);
4027
4028 __module_get(owner);
4029 conswitchp = csw;
4030 }
4031
4032 first = max(first, con_driver->first);
4033 last = min(last, con_driver->last);
4034
4035 for (i = first; i <= last; i++) {
4036 int old_was_color;
4037 struct vc_data *vc = vc_cons[i].d;
4038
4039 if (con_driver_map[i])
4040 module_put(con_driver_map[i]->owner);
4041 __module_get(owner);
4042 con_driver_map[i] = csw;
4043
4044 if (!vc || !vc->vc_sw)
4045 continue;
4046
4047 j = i;
4048
4049 if (con_is_visible(vc)) {
4050 k = i;
4051 save_screen(vc);
4052 }
4053
4054 old_was_color = vc->vc_can_do_color;
4055 vc->vc_sw->con_deinit(vc);
4056 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
4057 visual_init(vc, i, false);
4058 set_origin(vc);
4059 update_attr(vc);
4060
4061 /* If the console changed between mono <-> color, then
4062 * the attributes in the screenbuf will be wrong. The
4063 * following resets all attributes to something sane.
4064 */
4065 if (old_was_color != vc->vc_can_do_color)
4066 clear_buffer_attributes(vc);
4067 }
4068
4069 pr_info("Console: switching ");
4070 if (!deflt)
4071 pr_cont("consoles %d-%d ", first + 1, last + 1);
4072 if (j >= 0) {
4073 struct vc_data *vc = vc_cons[j].d;
4074
4075 pr_cont("to %s %s %dx%d\n",
4076 vc->vc_can_do_color ? "colour" : "mono",
4077 desc, vc->vc_cols, vc->vc_rows);
4078
4079 if (k >= 0) {
4080 vc = vc_cons[k].d;
4081 update_screen(vc);
4082 }
4083 } else {
4084 pr_cont("to %s\n", desc);
4085 }
4086
4087 retval = 0;
4088err:
4089 module_put(owner);
4090 return retval;
4091};
4092
4093
4094#ifdef CONFIG_VT_HW_CONSOLE_BINDING
4095int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
4096{
4097 struct module *owner = csw->owner;
4098 const struct consw *defcsw = NULL;
4099 struct con_driver *con_driver = NULL, *con_back = NULL;
4100 int i, retval = -ENODEV;
4101
4102 if (!try_module_get(owner))
4103 return -ENODEV;
4104
4105 WARN_CONSOLE_UNLOCKED();
4106
4107 /* check if driver is registered and if it is unbindable */
4108 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4109 con_driver = &registered_con_driver[i];
4110
4111 if (con_driver->con == csw &&
4112 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
4113 retval = 0;
4114 break;
4115 }
4116 }
4117
4118 if (retval)
4119 goto err;
4120
4121 retval = -ENODEV;
4122
4123 /* check if backup driver exists */
4124 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4125 con_back = &registered_con_driver[i];
4126
4127 if (con_back->con && con_back->con != csw) {
4128 defcsw = con_back->con;
4129 retval = 0;
4130 break;
4131 }
4132 }
4133
4134 if (retval)
4135 goto err;
4136
4137 if (!con_is_bound(csw))
4138 goto err;
4139
4140 first = max(first, con_driver->first);
4141 last = min(last, con_driver->last);
4142
4143 for (i = first; i <= last; i++) {
4144 if (con_driver_map[i] == csw) {
4145 module_put(csw->owner);
4146 con_driver_map[i] = NULL;
4147 }
4148 }
4149
4150 if (!con_is_bound(defcsw)) {
4151 const struct consw *defconsw = conswitchp;
4152
4153 defcsw->con_startup();
4154 con_back->flag |= CON_DRIVER_FLAG_INIT;
4155 /*
4156 * vgacon may change the default driver to point
4157 * to dummycon, we restore it here...
4158 */
4159 conswitchp = defconsw;
4160 }
4161
4162 if (!con_is_bound(csw))
4163 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
4164
4165 /* ignore return value, binding should not fail */
4166 do_bind_con_driver(defcsw, first, last, deflt);
4167err:
4168 module_put(owner);
4169 return retval;
4170
4171}
4172EXPORT_SYMBOL_GPL(do_unbind_con_driver);
4173
4174static int vt_bind(struct con_driver *con)
4175{
4176 const struct consw *defcsw = NULL, *csw = NULL;
4177 int i, more = 1, first = -1, last = -1, deflt = 0;
4178
4179 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
4180 goto err;
4181
4182 csw = con->con;
4183
4184 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4185 struct con_driver *con = &registered_con_driver[i];
4186
4187 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
4188 defcsw = con->con;
4189 break;
4190 }
4191 }
4192
4193 if (!defcsw)
4194 goto err;
4195
4196 while (more) {
4197 more = 0;
4198
4199 for (i = con->first; i <= con->last; i++) {
4200 if (con_driver_map[i] == defcsw) {
4201 if (first == -1)
4202 first = i;
4203 last = i;
4204 more = 1;
4205 } else if (first != -1)
4206 break;
4207 }
4208
4209 if (first == 0 && last == MAX_NR_CONSOLES -1)
4210 deflt = 1;
4211
4212 if (first != -1)
4213 do_bind_con_driver(csw, first, last, deflt);
4214
4215 first = -1;
4216 last = -1;
4217 deflt = 0;
4218 }
4219
4220err:
4221 return 0;
4222}
4223
4224static int vt_unbind(struct con_driver *con)
4225{
4226 const struct consw *csw = NULL;
4227 int i, more = 1, first = -1, last = -1, deflt = 0;
4228 int ret;
4229
4230 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
4231 goto err;
4232
4233 csw = con->con;
4234
4235 while (more) {
4236 more = 0;
4237
4238 for (i = con->first; i <= con->last; i++) {
4239 if (con_driver_map[i] == csw) {
4240 if (first == -1)
4241 first = i;
4242 last = i;
4243 more = 1;
4244 } else if (first != -1)
4245 break;
4246 }
4247
4248 if (first == 0 && last == MAX_NR_CONSOLES -1)
4249 deflt = 1;
4250
4251 if (first != -1) {
4252 ret = do_unbind_con_driver(csw, first, last, deflt);
4253 if (ret != 0)
4254 return ret;
4255 }
4256
4257 first = -1;
4258 last = -1;
4259 deflt = 0;
4260 }
4261
4262err:
4263 return 0;
4264}
4265#else
4266static inline int vt_bind(struct con_driver *con)
4267{
4268 return 0;
4269}
4270static inline int vt_unbind(struct con_driver *con)
4271{
4272 return 0;
4273}
4274#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
4275
4276static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
4277 const char *buf, size_t count)
4278{
4279 struct con_driver *con = dev_get_drvdata(dev);
4280 int bind = simple_strtoul(buf, NULL, 0);
4281
4282 guard(console_lock)();
4283
4284 if (bind)
4285 vt_bind(con);
4286 else
4287 vt_unbind(con);
4288
4289 return count;
4290}
4291
4292static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
4293 char *buf)
4294{
4295 struct con_driver *con = dev_get_drvdata(dev);
4296 int bind;
4297
4298 scoped_guard(console_lock)
4299 bind = con_is_bound(con->con);
4300
4301 return sysfs_emit(buf, "%i\n", bind);
4302}
4303
4304static ssize_t show_name(struct device *dev, struct device_attribute *attr,
4305 char *buf)
4306{
4307 struct con_driver *con = dev_get_drvdata(dev);
4308
4309 return sysfs_emit(buf, "%s %s\n",
4310 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
4311 con->desc);
4312
4313}
4314
4315static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
4316static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
4317
4318static struct attribute *con_dev_attrs[] = {
4319 &dev_attr_bind.attr,
4320 &dev_attr_name.attr,
4321 NULL
4322};
4323
4324ATTRIBUTE_GROUPS(con_dev);
4325
4326static int vtconsole_init_device(struct con_driver *con)
4327{
4328 con->flag |= CON_DRIVER_FLAG_ATTR;
4329 return 0;
4330}
4331
4332static void vtconsole_deinit_device(struct con_driver *con)
4333{
4334 con->flag &= ~CON_DRIVER_FLAG_ATTR;
4335}
4336
4337/**
4338 * con_is_bound - checks if driver is bound to the console
4339 * @csw: console driver
4340 *
4341 * RETURNS: zero if unbound, nonzero if bound
4342 *
4343 * Drivers can call this and if zero, they should release
4344 * all resources allocated on &consw.con_startup()
4345 */
4346int con_is_bound(const struct consw *csw)
4347{
4348 int i, bound = 0;
4349
4350 WARN_CONSOLE_UNLOCKED();
4351
4352 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4353 if (con_driver_map[i] == csw) {
4354 bound = 1;
4355 break;
4356 }
4357 }
4358
4359 return bound;
4360}
4361EXPORT_SYMBOL(con_is_bound);
4362
4363/**
4364 * con_is_visible - checks whether the current console is visible
4365 * @vc: virtual console
4366 *
4367 * RETURNS: zero if not visible, nonzero if visible
4368 */
4369bool con_is_visible(const struct vc_data *vc)
4370{
4371 WARN_CONSOLE_UNLOCKED();
4372
4373 return *vc->vc_display_fg == vc;
4374}
4375EXPORT_SYMBOL(con_is_visible);
4376
4377/**
4378 * con_debug_enter - prepare the console for the kernel debugger
4379 * @vc: virtual console
4380 *
4381 * Called when the console is taken over by the kernel debugger, this
4382 * function needs to save the current console state, then put the console
4383 * into a state suitable for the kernel debugger.
4384 */
4385void con_debug_enter(struct vc_data *vc)
4386{
4387#ifdef CONFIG_KGDB_KDB
4388 /* Set the initial LINES variable if it is not already set */
4389 if (vc->vc_rows < 999) {
4390 int linecount;
4391 char lns[4];
4392 const char *setargs[3] = {
4393 "set",
4394 "LINES",
4395 lns,
4396 };
4397 if (kdbgetintenv(setargs[0], &linecount)) {
4398 snprintf(lns, 4, "%i", vc->vc_rows);
4399 kdb_set(2, setargs);
4400 }
4401 }
4402 if (vc->vc_cols < 999) {
4403 int colcount;
4404 char cols[4];
4405 const char *setargs[3] = {
4406 "set",
4407 "COLUMNS",
4408 cols,
4409 };
4410 if (kdbgetintenv(setargs[0], &colcount)) {
4411 snprintf(cols, 4, "%i", vc->vc_cols);
4412 kdb_set(2, setargs);
4413 }
4414 }
4415#endif /* CONFIG_KGDB_KDB */
4416}
4417EXPORT_SYMBOL_GPL(con_debug_enter);
4418
4419/**
4420 * con_debug_leave - restore console state
4421 *
4422 * Restore the console state to what it was before the kernel debugger
4423 * was invoked.
4424 */
4425void con_debug_leave(void)
4426{ }
4427EXPORT_SYMBOL_GPL(con_debug_leave);
4428
4429static int do_register_con_driver(const struct consw *csw, int first, int last)
4430{
4431 struct module *owner = csw->owner;
4432 struct con_driver *con_driver;
4433 const char *desc;
4434 int i, retval;
4435
4436 WARN_CONSOLE_UNLOCKED();
4437
4438 if (!try_module_get(owner))
4439 return -ENODEV;
4440
4441 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4442 con_driver = &registered_con_driver[i];
4443
4444 /* already registered */
4445 if (con_driver->con == csw) {
4446 retval = -EBUSY;
4447 goto err;
4448 }
4449 }
4450
4451 desc = csw->con_startup();
4452 if (!desc) {
4453 retval = -ENODEV;
4454 goto err;
4455 }
4456
4457 retval = -EINVAL;
4458
4459 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4460 con_driver = &registered_con_driver[i];
4461
4462 if (con_driver->con == NULL &&
4463 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4464 con_driver->con = csw;
4465 con_driver->desc = desc;
4466 con_driver->node = i;
4467 con_driver->flag = CON_DRIVER_FLAG_MODULE |
4468 CON_DRIVER_FLAG_INIT;
4469 con_driver->first = first;
4470 con_driver->last = last;
4471 retval = 0;
4472 break;
4473 }
4474 }
4475
4476 if (retval)
4477 goto err;
4478
4479 con_driver->dev =
4480 device_create_with_groups(&vtconsole_class, NULL,
4481 MKDEV(0, con_driver->node),
4482 con_driver, con_dev_groups,
4483 "vtcon%i", con_driver->node);
4484 if (IS_ERR(con_driver->dev)) {
4485 pr_warn("Unable to create device for %s; errno = %ld\n",
4486 con_driver->desc, PTR_ERR(con_driver->dev));
4487 con_driver->dev = NULL;
4488 } else {
4489 vtconsole_init_device(con_driver);
4490 }
4491
4492err:
4493 module_put(owner);
4494 return retval;
4495}
4496
4497
4498/**
4499 * do_unregister_con_driver - unregister console driver from console layer
4500 * @csw: console driver
4501 *
4502 * DESCRIPTION: All drivers that registers to the console layer must
4503 * call this function upon exit, or if the console driver is in a state
4504 * where it won't be able to handle console services, such as the
4505 * framebuffer console without loaded framebuffer drivers.
4506 *
4507 * The driver must unbind first prior to unregistration.
4508 */
4509int do_unregister_con_driver(const struct consw *csw)
4510{
4511 int i;
4512
4513 /* cannot unregister a bound driver */
4514 if (con_is_bound(csw))
4515 return -EBUSY;
4516
4517 if (csw == conswitchp)
4518 return -EINVAL;
4519
4520 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4521 struct con_driver *con_driver = &registered_con_driver[i];
4522
4523 if (con_driver->con == csw) {
4524 /*
4525 * Defer the removal of the sysfs entries since that
4526 * will acquire the kernfs s_active lock and we can't
4527 * acquire this lock while holding the console lock:
4528 * the unbind sysfs entry imposes already the opposite
4529 * order. Reset con already here to prevent any later
4530 * lookup to succeed and mark this slot as zombie, so
4531 * it won't get reused until we complete the removal
4532 * in the deferred work.
4533 */
4534 con_driver->con = NULL;
4535 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4536 schedule_work(&con_driver_unregister_work);
4537
4538 return 0;
4539 }
4540 }
4541
4542 return -ENODEV;
4543}
4544EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4545
4546static void con_driver_unregister_callback(struct work_struct *ignored)
4547{
4548 int i;
4549
4550 guard(console_lock)();
4551
4552 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4553 struct con_driver *con_driver = &registered_con_driver[i];
4554
4555 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4556 continue;
4557
4558 console_unlock();
4559
4560 vtconsole_deinit_device(con_driver);
4561 device_destroy(&vtconsole_class, MKDEV(0, con_driver->node));
4562
4563 console_lock();
4564
4565 if (WARN_ON_ONCE(con_driver->con))
4566 con_driver->con = NULL;
4567 con_driver->desc = NULL;
4568 con_driver->dev = NULL;
4569 con_driver->node = 0;
4570 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4571 con_driver->flag = 0;
4572 con_driver->first = 0;
4573 con_driver->last = 0;
4574 }
4575}
4576
4577/*
4578 * If we support more console drivers, this function is used
4579 * when a driver wants to take over some existing consoles
4580 * and become default driver for newly opened ones.
4581 *
4582 * do_take_over_console is basically a register followed by bind
4583 */
4584int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4585{
4586 int err;
4587
4588 err = do_register_con_driver(csw, first, last);
4589 /*
4590 * If we get an busy error we still want to bind the console driver
4591 * and return success, as we may have unbound the console driver
4592 * but not unregistered it.
4593 */
4594 if (err == -EBUSY)
4595 err = 0;
4596 if (!err)
4597 do_bind_con_driver(csw, first, last, deflt);
4598
4599 return err;
4600}
4601EXPORT_SYMBOL_GPL(do_take_over_console);
4602
4603
4604/*
4605 * give_up_console is a wrapper to unregister_con_driver. It will only
4606 * work if driver is fully unbound.
4607 */
4608void give_up_console(const struct consw *csw)
4609{
4610 guard(console_lock)();
4611 do_unregister_con_driver(csw);
4612}
4613EXPORT_SYMBOL(give_up_console);
4614
4615static int __init vtconsole_class_init(void)
4616{
4617 int i;
4618
4619 i = class_register(&vtconsole_class);
4620 if (i)
4621 pr_warn("Unable to create vt console class; errno = %d\n", i);
4622
4623 /* Add system drivers to sysfs */
4624 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4625 struct con_driver *con = &registered_con_driver[i];
4626
4627 if (con->con && !con->dev) {
4628 con->dev =
4629 device_create_with_groups(&vtconsole_class, NULL,
4630 MKDEV(0, con->node),
4631 con, con_dev_groups,
4632 "vtcon%i", con->node);
4633
4634 if (IS_ERR(con->dev)) {
4635 pr_warn("Unable to create device for %s; errno = %ld\n",
4636 con->desc, PTR_ERR(con->dev));
4637 con->dev = NULL;
4638 } else {
4639 vtconsole_init_device(con);
4640 }
4641 }
4642 }
4643
4644 return 0;
4645}
4646postcore_initcall(vtconsole_class_init);
4647
4648/*
4649 * Screen blanking
4650 */
4651
4652static int set_vesa_blanking(u8 __user *mode_user)
4653{
4654 u8 mode;
4655
4656 if (get_user(mode, mode_user))
4657 return -EFAULT;
4658
4659 guard(console_lock)();
4660 vesa_blank_mode = (mode <= VESA_BLANK_MAX) ? mode : VESA_NO_BLANKING;
4661
4662 return 0;
4663}
4664
4665void do_blank_screen(int entering_gfx)
4666{
4667 struct vc_data *vc = vc_cons[fg_console].d;
4668 int i;
4669
4670 might_sleep();
4671
4672 WARN_CONSOLE_UNLOCKED();
4673
4674 if (console_blanked) {
4675 if (blank_state == blank_vesa_wait) {
4676 blank_state = blank_off;
4677 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4678 }
4679 return;
4680 }
4681
4682 /* entering graphics mode? */
4683 if (entering_gfx) {
4684 hide_cursor(vc);
4685 save_screen(vc);
4686 vc->vc_sw->con_blank(vc, VESA_VSYNC_SUSPEND, 1);
4687 console_blanked = fg_console + 1;
4688 blank_state = blank_off;
4689 set_origin(vc);
4690 return;
4691 }
4692
4693 blank_state = blank_off;
4694
4695 /* don't blank graphics */
4696 if (vc->vc_mode != KD_TEXT) {
4697 console_blanked = fg_console + 1;
4698 return;
4699 }
4700
4701 hide_cursor(vc);
4702 timer_delete_sync(&console_timer);
4703 blank_timer_expired = 0;
4704
4705 save_screen(vc);
4706 /* In case we need to reset origin, blanking hook returns 1 */
4707 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? VESA_VSYNC_SUSPEND :
4708 (vesa_blank_mode + 1), 0);
4709 console_blanked = fg_console + 1;
4710 if (i)
4711 set_origin(vc);
4712
4713 if (console_blank_hook && console_blank_hook(1))
4714 return;
4715
4716 if (vesa_off_interval && vesa_blank_mode) {
4717 blank_state = blank_vesa_wait;
4718 mod_timer(&console_timer, jiffies + vesa_off_interval);
4719 }
4720 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4721}
4722EXPORT_SYMBOL(do_blank_screen);
4723
4724/*
4725 * Called by timer as well as from vt_console_driver
4726 */
4727void do_unblank_screen(int leaving_gfx)
4728{
4729 struct vc_data *vc;
4730
4731 /* This should now always be called from a "sane" (read: can schedule)
4732 * context for the sake of the low level drivers, except in the special
4733 * case of oops_in_progress
4734 */
4735 if (!oops_in_progress)
4736 might_sleep();
4737
4738 WARN_CONSOLE_UNLOCKED();
4739
4740 ignore_poke = 0;
4741 if (!console_blanked)
4742 return;
4743 if (!vc_cons_allocated(fg_console)) {
4744 /* impossible */
4745 pr_warn("unblank_screen: tty %d not allocated ??\n",
4746 fg_console + 1);
4747 return;
4748 }
4749 vc = vc_cons[fg_console].d;
4750 if (vc->vc_mode != KD_TEXT)
4751 return; /* but leave console_blanked != 0 */
4752
4753 if (blankinterval) {
4754 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4755 blank_state = blank_normal_wait;
4756 }
4757
4758 console_blanked = 0;
4759 if (vc->vc_sw->con_blank(vc, VESA_NO_BLANKING, leaving_gfx))
4760 /* Low-level driver cannot restore -> do it ourselves */
4761 update_screen(vc);
4762 if (console_blank_hook)
4763 console_blank_hook(0);
4764 set_palette(vc);
4765 set_cursor(vc);
4766 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4767 notify_update(vc);
4768}
4769EXPORT_SYMBOL(do_unblank_screen);
4770
4771/*
4772 * This is called by the outside world to cause a forced unblank, mostly for
4773 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4774 * call it with 1 as an argument and so force a mode restore... that may kill
4775 * X or at least garbage the screen but would also make the Oops visible...
4776 */
4777static void unblank_screen(void)
4778{
4779 do_unblank_screen(0);
4780}
4781
4782/*
4783 * We defer the timer blanking to work queue so it can take the console mutex
4784 * (console operations can still happen at irq time, but only from printk which
4785 * has the console mutex. Not perfect yet, but better than no locking
4786 */
4787static void blank_screen_t(struct timer_list *unused)
4788{
4789 blank_timer_expired = 1;
4790 schedule_work(&console_work);
4791}
4792
4793void poke_blanked_console(void)
4794{
4795 WARN_CONSOLE_UNLOCKED();
4796
4797 /* Add this so we quickly catch whoever might call us in a non
4798 * safe context. Nowadays, unblank_screen() isn't to be called in
4799 * atomic contexts and is allowed to schedule (with the special case
4800 * of oops_in_progress, but that isn't of any concern for this
4801 * function. --BenH.
4802 */
4803 might_sleep();
4804
4805 /* This isn't perfectly race free, but a race here would be mostly harmless,
4806 * at worst, we'll do a spurious blank and it's unlikely
4807 */
4808 timer_delete(&console_timer);
4809 blank_timer_expired = 0;
4810
4811 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4812 return;
4813 if (console_blanked)
4814 unblank_screen();
4815 else if (blankinterval) {
4816 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4817 blank_state = blank_normal_wait;
4818 }
4819}
4820
4821/*
4822 * Palettes
4823 */
4824
4825static void set_palette(struct vc_data *vc)
4826{
4827 WARN_CONSOLE_UNLOCKED();
4828
4829 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4830 vc->vc_sw->con_set_palette(vc, color_table);
4831}
4832
4833/*
4834 * Load palette into the DAC registers. arg points to a colour
4835 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4836 */
4837
4838int con_set_cmap(unsigned char __user *arg)
4839{
4840 int i, j, k;
4841 unsigned char colormap[3*16];
4842
4843 if (copy_from_user(colormap, arg, sizeof(colormap)))
4844 return -EFAULT;
4845
4846 guard(console_lock)();
4847 for (i = k = 0; i < 16; i++) {
4848 default_red[i] = colormap[k++];
4849 default_grn[i] = colormap[k++];
4850 default_blu[i] = colormap[k++];
4851 }
4852 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4853 if (!vc_cons_allocated(i))
4854 continue;
4855 for (j = k = 0; j < 16; j++) {
4856 vc_cons[i].d->vc_palette[k++] = default_red[j];
4857 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4858 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4859 }
4860 set_palette(vc_cons[i].d);
4861 }
4862
4863 return 0;
4864}
4865
4866int con_get_cmap(unsigned char __user *arg)
4867{
4868 int i, k;
4869 unsigned char colormap[3*16];
4870
4871 scoped_guard(console_lock)
4872 for (i = k = 0; i < 16; i++) {
4873 colormap[k++] = default_red[i];
4874 colormap[k++] = default_grn[i];
4875 colormap[k++] = default_blu[i];
4876 }
4877
4878 if (copy_to_user(arg, colormap, sizeof(colormap)))
4879 return -EFAULT;
4880
4881 return 0;
4882}
4883
4884void reset_palette(struct vc_data *vc)
4885{
4886 int j, k;
4887 for (j=k=0; j<16; j++) {
4888 vc->vc_palette[k++] = default_red[j];
4889 vc->vc_palette[k++] = default_grn[j];
4890 vc->vc_palette[k++] = default_blu[j];
4891 }
4892 set_palette(vc);
4893}
4894
4895/*
4896 * Font switching
4897 *
4898 * Currently we only support fonts up to 128 pixels wide, at a maximum height
4899 * of 128 pixels. Userspace fontdata may have to be stored with 32 bytes
4900 * (shorts/ints, depending on width) reserved for each character which is
4901 * kinda wasty, but this is done in order to maintain compatibility with the
4902 * EGA/VGA fonts. It is up to the actual low-level console-driver convert data
4903 * into its favorite format (maybe we should add a `fontoffset' field to the
4904 * `display' structure so we won't have to convert the fontdata all the time.
4905 * /Jes
4906 */
4907
4908#define max_font_width 64
4909#define max_font_height 128
4910#define max_font_glyphs 512
4911#define max_font_size (max_font_glyphs*max_font_width*max_font_height)
4912
4913static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4914{
4915 struct console_font font;
4916 int c;
4917 unsigned int vpitch = op->op == KD_FONT_OP_GET_TALL ? op->height : 32;
4918
4919 if (vpitch > max_font_height)
4920 return -EINVAL;
4921
4922 void *font_data __free(kvfree) = NULL;
4923 if (op->data) {
4924 font.data = font_data = kvzalloc(max_font_size, GFP_KERNEL);
4925 if (!font.data)
4926 return -ENOMEM;
4927 } else
4928 font.data = NULL;
4929
4930 scoped_guard(console_lock) {
4931 if (vc->vc_mode != KD_TEXT)
4932 return -EINVAL;
4933 if (!vc->vc_sw->con_font_get)
4934 return -ENOSYS;
4935
4936 int ret = vc->vc_sw->con_font_get(vc, &font, vpitch);
4937 if (ret)
4938 return ret;
4939 }
4940
4941 c = DIV_ROUND_UP(font.width, 8) * vpitch * font.charcount;
4942
4943 if (op->data && font.charcount > op->charcount)
4944 return -ENOSPC;
4945 if (font.width > op->width || font.height > op->height)
4946 return -ENOSPC;
4947
4948 op->height = font.height;
4949 op->width = font.width;
4950 op->charcount = font.charcount;
4951
4952 if (op->data && copy_to_user(op->data, font.data, c))
4953 return -EFAULT;
4954
4955 return 0;
4956}
4957
4958static int con_font_set(struct vc_data *vc, const struct console_font_op *op)
4959{
4960 struct console_font font;
4961 int size;
4962 unsigned int vpitch = op->op == KD_FONT_OP_SET_TALL ? op->height : 32;
4963
4964 if (!op->data)
4965 return -EINVAL;
4966 if (op->charcount > max_font_glyphs)
4967 return -EINVAL;
4968 if (op->width <= 0 || op->width > max_font_width || !op->height ||
4969 op->height > max_font_height)
4970 return -EINVAL;
4971 if (vpitch < op->height)
4972 return -EINVAL;
4973 size = DIV_ROUND_UP(op->width, 8) * vpitch * op->charcount;
4974 if (size > max_font_size)
4975 return -ENOSPC;
4976
4977 void *font_data __free(kfree) = font.data = memdup_user(op->data, size);
4978 if (IS_ERR(font.data))
4979 return PTR_ERR(font.data);
4980
4981 font.charcount = op->charcount;
4982 font.width = op->width;
4983 font.height = op->height;
4984
4985 guard(console_lock)();
4986
4987 if (vc->vc_mode != KD_TEXT)
4988 return -EINVAL;
4989 if (!vc->vc_sw->con_font_set)
4990 return -ENOSYS;
4991
4992 /* hide selection and cursor prior font changes */
4993 hide_cursor(vc);
4994
4995 return vc->vc_sw->con_font_set(vc, &font, vpitch, op->flags);
4996}
4997
4998static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4999{
5000 struct console_font font = {.width = op->width, .height = op->height};
5001 char name[MAX_FONT_NAME];
5002 char *s = name;
5003
5004 if (!op->data)
5005 s = NULL;
5006 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
5007 return -EFAULT;
5008 else
5009 name[MAX_FONT_NAME - 1] = 0;
5010
5011 scoped_guard(console_lock) {
5012 if (vc->vc_mode != KD_TEXT)
5013 return -EINVAL;
5014 if (!vc->vc_sw->con_font_default)
5015 return -ENOSYS;
5016
5017 /* hide selection and cursor prior font changes */
5018 hide_cursor(vc);
5019
5020 int ret = vc->vc_sw->con_font_default(vc, &font, s);
5021 if (ret)
5022 return ret;
5023 }
5024
5025 op->width = font.width;
5026 op->height = font.height;
5027
5028 return 0;
5029}
5030
5031int con_font_op(struct vc_data *vc, struct console_font_op *op)
5032{
5033 switch (op->op) {
5034 case KD_FONT_OP_SET:
5035 case KD_FONT_OP_SET_TALL:
5036 return con_font_set(vc, op);
5037 case KD_FONT_OP_GET:
5038 case KD_FONT_OP_GET_TALL:
5039 return con_font_get(vc, op);
5040 case KD_FONT_OP_SET_DEFAULT:
5041 return con_font_default(vc, op);
5042 case KD_FONT_OP_COPY:
5043 /* was buggy and never really used */
5044 return -EINVAL;
5045 }
5046 return -ENOSYS;
5047}
5048
5049/*
5050 * Interface exported to selection and vcs.
5051 */
5052
5053/* used by selection */
5054u16 screen_glyph(const struct vc_data *vc, int offset)
5055{
5056 u16 w = scr_readw(screenpos(vc, offset, true));
5057 u16 c = w & 0xff;
5058
5059 if (w & vc->vc_hi_font_mask)
5060 c |= 0x100;
5061 return c;
5062}
5063EXPORT_SYMBOL_GPL(screen_glyph);
5064
5065u32 screen_glyph_unicode(const struct vc_data *vc, int n)
5066{
5067 u32 **uni_lines = vc->vc_uni_lines;
5068
5069 if (uni_lines)
5070 return uni_lines[n / vc->vc_cols][n % vc->vc_cols];
5071
5072 return inverse_translate(vc, screen_glyph(vc, n * 2), true);
5073}
5074EXPORT_SYMBOL_GPL(screen_glyph_unicode);
5075
5076/* used by vcs - note the word offset */
5077unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
5078{
5079 return screenpos(vc, 2 * w_offset, viewed);
5080}
5081EXPORT_SYMBOL_GPL(screen_pos);
5082
5083void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
5084{
5085 /* clamp values if they don't fit */
5086 xy[0] = min(vc->state.x, 0xFFu);
5087 xy[1] = min(vc->state.y, 0xFFu);
5088}
5089
5090void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
5091{
5092 hide_cursor(vc);
5093 gotoxy(vc, xy[0], xy[1]);
5094 set_cursor(vc);
5095}
5096
5097u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
5098{
5099 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
5100 return softcursor_original;
5101 return scr_readw(org);
5102}
5103
5104void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
5105{
5106 scr_writew(val, org);
5107 if ((unsigned long)org == vc->vc_pos) {
5108 softcursor_original = -1;
5109 add_softcursor(vc);
5110 }
5111}
5112
5113void vcs_scr_updated(struct vc_data *vc)
5114{
5115 notify_update(vc);
5116}