1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6/*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
61 * deletion SMP-safe. 17Jun00, Andrew Morton
62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72 */
73
74#include <linux/module.h>
75#include <linux/types.h>
76#include <linux/sched/signal.h>
77#include <linux/tty.h>
78#include <linux/tty_flip.h>
79#include <linux/kernel.h>
80#include <linux/string.h>
81#include <linux/errno.h>
82#include <linux/kd.h>
83#include <linux/slab.h>
84#include <linux/vmalloc.h>
85#include <linux/major.h>
86#include <linux/mm.h>
87#include <linux/console.h>
88#include <linux/init.h>
89#include <linux/mutex.h>
90#include <linux/vt_kern.h>
91#include <linux/selection.h>
92#include <linux/tiocl.h>
93#include <linux/kbd_kern.h>
94#include <linux/consolemap.h>
95#include <linux/timer.h>
96#include <linux/interrupt.h>
97#include <linux/workqueue.h>
98#include <linux/pm.h>
99#include <linux/font.h>
100#include <linux/bitops.h>
101#include <linux/notifier.h>
102#include <linux/device.h>
103#include <linux/io.h>
104#include <linux/uaccess.h>
105#include <linux/kdb.h>
106#include <linux/ctype.h>
107#include <linux/gcd.h>
108
109#define MAX_NR_CON_DRIVER 16
110
111#define CON_DRIVER_FLAG_MODULE 1
112#define CON_DRIVER_FLAG_INIT 2
113#define CON_DRIVER_FLAG_ATTR 4
114#define CON_DRIVER_FLAG_ZOMBIE 8
115
116struct con_driver {
117 const struct consw *con;
118 const char *desc;
119 struct device *dev;
120 int node;
121 int first;
122 int last;
123 int flag;
124};
125
126static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
127const struct consw *conswitchp;
128
129/*
130 * Here is the default bell parameters: 750HZ, 1/8th of a second
131 */
132#define DEFAULT_BELL_PITCH 750
133#define DEFAULT_BELL_DURATION (HZ/8)
134#define DEFAULT_CURSOR_BLINK_MS 200
135
136struct vc vc_cons [MAX_NR_CONSOLES];
137EXPORT_SYMBOL(vc_cons);
138
139static const struct consw *con_driver_map[MAX_NR_CONSOLES];
140
141static int con_open(struct tty_struct *, struct file *);
142static void vc_init(struct vc_data *vc, int do_clear);
143static void gotoxy(struct vc_data *vc, int new_x, int new_y);
144static void restore_cur(struct vc_data *vc);
145static void save_cur(struct vc_data *vc);
146static void reset_terminal(struct vc_data *vc, int do_clear);
147static void con_flush_chars(struct tty_struct *tty);
148static int set_vesa_blanking(u8 __user *mode);
149static void set_cursor(struct vc_data *vc);
150static void hide_cursor(struct vc_data *vc);
151static void console_callback(struct work_struct *ignored);
152static void con_driver_unregister_callback(struct work_struct *ignored);
153static void blank_screen_t(struct timer_list *unused);
154static void set_palette(struct vc_data *vc);
155static void unblank_screen(void);
156
157#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
158
159int default_utf8 = true;
160module_param(default_utf8, int, S_IRUGO | S_IWUSR);
161int global_cursor_default = -1;
162module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
163EXPORT_SYMBOL(global_cursor_default);
164
165static int cur_default = CUR_UNDERLINE;
166module_param(cur_default, int, S_IRUGO | S_IWUSR);
167
168/*
169 * ignore_poke: don't unblank the screen when things are typed. This is
170 * mainly for the privacy of braille terminal users.
171 */
172static int ignore_poke;
173
174int do_poke_blanked_console;
175int console_blanked;
176EXPORT_SYMBOL(console_blanked);
177
178static enum vesa_blank_mode vesa_blank_mode;
179static int vesa_off_interval;
180static int blankinterval;
181core_param(consoleblank, blankinterval, int, 0444);
182
183static DECLARE_WORK(console_work, console_callback);
184static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
185
186/*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
190 * saved_* variants are for save/restore around kernel debugger enter/leave
191 */
192int fg_console;
193EXPORT_SYMBOL(fg_console);
194int last_console;
195int want_console = -1;
196
197static int saved_fg_console;
198static int saved_last_console;
199static int saved_want_console;
200static int saved_vc_mode;
201static int saved_console_blanked;
202
203/*
204 * For each existing display, we have a pointer to console currently visible
205 * on that display, allowing consoles other than fg_console to be refreshed
206 * appropriately. Unless the low-level driver supplies its own display_fg
207 * variable, we use this one for the "master display".
208 */
209static struct vc_data *master_display_fg;
210
211/*
212 * Unfortunately, we need to delay tty echo when we're currently writing to the
213 * console since the code is (and always was) not re-entrant, so we schedule
214 * all flip requests to process context with schedule-task() and run it from
215 * console_callback().
216 */
217
218/*
219 * For the same reason, we defer scrollback to the console callback.
220 */
221static int scrollback_delta;
222
223/*
224 * Hook so that the power management routines can (un)blank
225 * the console on our behalf.
226 */
227int (*console_blank_hook)(int);
228EXPORT_SYMBOL(console_blank_hook);
229
230static DEFINE_TIMER(console_timer, blank_screen_t);
231static int blank_state;
232static int blank_timer_expired;
233enum {
234 blank_off = 0,
235 blank_normal_wait,
236 blank_vesa_wait,
237};
238
239/*
240 * /sys/class/tty/tty0/
241 *
242 * the attribute 'active' contains the name of the current vc
243 * console and it supports poll() to detect vc switches
244 */
245static struct device *tty0dev;
246
247/*
248 * Notifier list for console events.
249 */
250static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
251
252int register_vt_notifier(struct notifier_block *nb)
253{
254 return atomic_notifier_chain_register(nh: &vt_notifier_list, nb);
255}
256EXPORT_SYMBOL_GPL(register_vt_notifier);
257
258int unregister_vt_notifier(struct notifier_block *nb)
259{
260 return atomic_notifier_chain_unregister(nh: &vt_notifier_list, nb);
261}
262EXPORT_SYMBOL_GPL(unregister_vt_notifier);
263
264static void notify_write(struct vc_data *vc, unsigned int unicode)
265{
266 struct vt_notifier_param param = { .vc = vc, .c = unicode };
267 atomic_notifier_call_chain(nh: &vt_notifier_list, VT_WRITE, v: &param);
268}
269
270static void notify_update(struct vc_data *vc)
271{
272 struct vt_notifier_param param = { .vc = vc };
273 atomic_notifier_call_chain(nh: &vt_notifier_list, VT_UPDATE, v: &param);
274}
275/*
276 * Low-Level Functions
277 */
278
279static inline bool con_is_fg(const struct vc_data *vc)
280{
281 return vc->vc_num == fg_console;
282}
283
284static inline bool con_should_update(const struct vc_data *vc)
285{
286 return con_is_visible(vc) && !console_blanked;
287}
288
289static inline u16 *screenpos(const struct vc_data *vc, unsigned int offset,
290 bool viewed)
291{
292 unsigned long origin = viewed ? vc->vc_visible_origin : vc->vc_origin;
293
294 return (u16 *)(origin + offset);
295}
296
297static void con_putc(struct vc_data *vc, u16 ca, unsigned int y, unsigned int x)
298{
299 if (vc->vc_sw->con_putc)
300 vc->vc_sw->con_putc(vc, ca, y, x);
301 else
302 vc->vc_sw->con_putcs(vc, &ca, 1, y, x);
303}
304
305/* Called from the keyboard irq path.. */
306static inline void scrolldelta(int lines)
307{
308 /* FIXME */
309 /* scrolldelta needs some kind of consistency lock, but the BKL was
310 and still is not protecting versus the scheduled back end */
311 scrollback_delta += lines;
312 schedule_console_callback();
313}
314
315void schedule_console_callback(void)
316{
317 schedule_work(work: &console_work);
318}
319
320/*
321 * Code to manage unicode-based screen buffers
322 */
323
324/*
325 * Our screen buffer is preceded by an array of line pointers so that
326 * scrolling only implies some pointer shuffling.
327 */
328
329static u32 **vc_uniscr_alloc(unsigned int cols, unsigned int rows)
330{
331 u32 **uni_lines;
332 void *p;
333 unsigned int memsize, i, col_size = cols * sizeof(**uni_lines);
334
335 /* allocate everything in one go */
336 memsize = col_size * rows;
337 memsize += rows * sizeof(*uni_lines);
338 uni_lines = vzalloc(memsize);
339 if (!uni_lines)
340 return NULL;
341
342 /* initial line pointers */
343 p = uni_lines + rows;
344 for (i = 0; i < rows; i++) {
345 uni_lines[i] = p;
346 p += col_size;
347 }
348
349 return uni_lines;
350}
351
352static void vc_uniscr_free(u32 **uni_lines)
353{
354 vfree(addr: uni_lines);
355}
356
357static void vc_uniscr_set(struct vc_data *vc, u32 **new_uni_lines)
358{
359 vc_uniscr_free(uni_lines: vc->vc_uni_lines);
360 vc->vc_uni_lines = new_uni_lines;
361}
362
363static void vc_uniscr_putc(struct vc_data *vc, u32 uc)
364{
365 if (vc->vc_uni_lines)
366 vc->vc_uni_lines[vc->state.y][vc->state.x] = uc;
367}
368
369static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
370{
371 if (vc->vc_uni_lines) {
372 u32 *ln = vc->vc_uni_lines[vc->state.y];
373 unsigned int x = vc->state.x, cols = vc->vc_cols;
374
375 memmove(dest: &ln[x + nr], src: &ln[x], count: (cols - x - nr) * sizeof(*ln));
376 memset32(s: &ln[x], v: ' ', n: nr);
377 }
378}
379
380static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
381{
382 if (vc->vc_uni_lines) {
383 u32 *ln = vc->vc_uni_lines[vc->state.y];
384 unsigned int x = vc->state.x, cols = vc->vc_cols;
385
386 memmove(dest: &ln[x], src: &ln[x + nr], count: (cols - x - nr) * sizeof(*ln));
387 memset32(s: &ln[cols - nr], v: ' ', n: nr);
388 }
389}
390
391static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
392 unsigned int nr)
393{
394 if (vc->vc_uni_lines)
395 memset32(s: &vc->vc_uni_lines[vc->state.y][x], v: ' ', n: nr);
396}
397
398static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
399 unsigned int nr)
400{
401 if (vc->vc_uni_lines)
402 while (nr--)
403 memset32(s: vc->vc_uni_lines[y++], v: ' ', n: vc->vc_cols);
404}
405
406/* juggling array rotation algorithm (complexity O(N), size complexity O(1)) */
407static void juggle_array(u32 **array, unsigned int size, unsigned int nr)
408{
409 unsigned int gcd_idx;
410
411 for (gcd_idx = 0; gcd_idx < gcd(a: nr, b: size); gcd_idx++) {
412 u32 *gcd_idx_val = array[gcd_idx];
413 unsigned int dst_idx = gcd_idx;
414
415 while (1) {
416 unsigned int src_idx = (dst_idx + nr) % size;
417 if (src_idx == gcd_idx)
418 break;
419
420 array[dst_idx] = array[src_idx];
421 dst_idx = src_idx;
422 }
423
424 array[dst_idx] = gcd_idx_val;
425 }
426}
427
428static void vc_uniscr_scroll(struct vc_data *vc, unsigned int top,
429 unsigned int bottom, enum con_scroll dir,
430 unsigned int nr)
431{
432 u32 **uni_lines = vc->vc_uni_lines;
433 unsigned int size = bottom - top;
434
435 if (!uni_lines)
436 return;
437
438 if (dir == SM_DOWN) {
439 juggle_array(array: &uni_lines[top], size, nr: size - nr);
440 vc_uniscr_clear_lines(vc, y: top, nr);
441 } else {
442 juggle_array(array: &uni_lines[top], size, nr);
443 vc_uniscr_clear_lines(vc, y: bottom - nr, nr);
444 }
445}
446
447static u32 vc_uniscr_getc(struct vc_data *vc, int relative_pos)
448{
449 int pos = vc->state.x + vc->vc_need_wrap + relative_pos;
450
451 if (vc->vc_uni_lines && in_range(pos, 0, vc->vc_cols))
452 return vc->vc_uni_lines[vc->state.y][pos];
453 return 0;
454}
455
456static void vc_uniscr_copy_area(u32 **dst_lines,
457 unsigned int dst_cols,
458 unsigned int dst_rows,
459 u32 **src_lines,
460 unsigned int src_cols,
461 unsigned int src_top_row,
462 unsigned int src_bot_row)
463{
464 unsigned int dst_row = 0;
465
466 if (!dst_lines)
467 return;
468
469 while (src_top_row < src_bot_row) {
470 u32 *src_line = src_lines[src_top_row];
471 u32 *dst_line = dst_lines[dst_row];
472
473 memcpy(to: dst_line, from: src_line, len: src_cols * sizeof(*src_line));
474 if (dst_cols - src_cols)
475 memset32(s: dst_line + src_cols, v: ' ', n: dst_cols - src_cols);
476 src_top_row++;
477 dst_row++;
478 }
479 while (dst_row < dst_rows) {
480 u32 *dst_line = dst_lines[dst_row];
481
482 memset32(s: dst_line, v: ' ', n: dst_cols);
483 dst_row++;
484 }
485}
486
487/*
488 * Called from vcs_read() to make sure unicode screen retrieval is possible.
489 * This will initialize the unicode screen buffer if not already done.
490 * This returns 0 if OK, or a negative error code otherwise.
491 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
492 */
493int vc_uniscr_check(struct vc_data *vc)
494{
495 u32 **uni_lines;
496 unsigned short *p;
497 int x, y, mask;
498
499 WARN_CONSOLE_UNLOCKED();
500
501 if (!vc->vc_utf)
502 return -ENODATA;
503
504 if (vc->vc_uni_lines)
505 return 0;
506
507 uni_lines = vc_uniscr_alloc(cols: vc->vc_cols, rows: vc->vc_rows);
508 if (!uni_lines)
509 return -ENOMEM;
510
511 /*
512 * Let's populate it initially with (imperfect) reverse translation.
513 * This is the next best thing we can do short of having it enabled
514 * from the start even when no users rely on this functionality. True
515 * unicode content will be available after a complete screen refresh.
516 */
517 p = (unsigned short *)vc->vc_origin;
518 mask = vc->vc_hi_font_mask | 0xff;
519 for (y = 0; y < vc->vc_rows; y++) {
520 u32 *line = uni_lines[y];
521 for (x = 0; x < vc->vc_cols; x++) {
522 u16 glyph = scr_readw(p++) & mask;
523 line[x] = inverse_translate(conp: vc, glyph, use_unicode: true);
524 }
525 }
526
527 vc->vc_uni_lines = uni_lines;
528
529 return 0;
530}
531
532/*
533 * Called from vcs_read() to get the unicode data from the screen.
534 * This must be preceded by a successful call to vc_uniscr_check() once
535 * the console lock has been taken.
536 */
537void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
538 unsigned int row, unsigned int col, unsigned int nr)
539{
540 u32 **uni_lines = vc->vc_uni_lines;
541 int offset = row * vc->vc_size_row + col * 2;
542 unsigned long pos;
543
544 if (WARN_ON_ONCE(!uni_lines))
545 return;
546
547 pos = (unsigned long)screenpos(vc, offset, viewed);
548 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
549 /*
550 * Desired position falls in the main screen buffer.
551 * However the actual row/col might be different if
552 * scrollback is active.
553 */
554 row = (pos - vc->vc_origin) / vc->vc_size_row;
555 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
556 memcpy(to: dest, from: &uni_lines[row][col], len: nr * sizeof(u32));
557 } else {
558 /*
559 * Scrollback is active. For now let's simply backtranslate
560 * the screen glyphs until the unicode screen buffer does
561 * synchronize with console display drivers for a scrollback
562 * buffer of its own.
563 */
564 u16 *p = (u16 *)pos;
565 int mask = vc->vc_hi_font_mask | 0xff;
566 u32 *uni_buf = dest;
567 while (nr--) {
568 u16 glyph = scr_readw(p++) & mask;
569 *uni_buf++ = inverse_translate(conp: vc, glyph, use_unicode: true);
570 }
571 }
572}
573
574static void con_scroll(struct vc_data *vc, unsigned int top,
575 unsigned int bottom, enum con_scroll dir,
576 unsigned int nr)
577{
578 unsigned int rows = bottom - top;
579 u16 *clear, *dst, *src;
580
581 if (top + nr >= bottom)
582 nr = rows - 1;
583 if (bottom > vc->vc_rows || top >= bottom || nr < 1)
584 return;
585
586 vc_uniscr_scroll(vc, top, bottom, dir, nr);
587 if (con_is_visible(vc) &&
588 vc->vc_sw->con_scroll(vc, top, bottom, dir, nr))
589 return;
590
591 src = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * top);
592 dst = (u16 *)(vc->vc_origin + vc->vc_size_row * (top + nr));
593
594 if (dir == SM_UP) {
595 clear = src + (rows - nr) * vc->vc_cols;
596 swap(src, dst);
597 }
598 scr_memmovew(d: dst, s: src, count: (rows - nr) * vc->vc_size_row);
599 scr_memsetw(s: clear, c: vc->vc_video_erase_char, count: vc->vc_size_row * nr);
600}
601
602static void do_update_region(struct vc_data *vc, unsigned long start, int count)
603{
604 unsigned int xx, yy, offset;
605 u16 *p = (u16 *)start;
606
607 offset = (start - vc->vc_origin) / 2;
608 xx = offset % vc->vc_cols;
609 yy = offset / vc->vc_cols;
610
611 for(;;) {
612 u16 attrib = scr_readw(p) & 0xff00;
613 int startx = xx;
614 u16 *q = p;
615 while (xx < vc->vc_cols && count) {
616 if (attrib != (scr_readw(p) & 0xff00)) {
617 if (p > q)
618 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
619 startx = xx;
620 q = p;
621 attrib = scr_readw(p) & 0xff00;
622 }
623 p++;
624 xx++;
625 count--;
626 }
627 if (p > q)
628 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
629 if (!count)
630 break;
631 xx = 0;
632 yy++;
633 }
634}
635
636void update_region(struct vc_data *vc, unsigned long start, int count)
637{
638 WARN_CONSOLE_UNLOCKED();
639
640 if (con_should_update(vc)) {
641 hide_cursor(vc);
642 do_update_region(vc, start, count);
643 set_cursor(vc);
644 }
645}
646EXPORT_SYMBOL(update_region);
647
648/* Structure of attributes is hardware-dependent */
649
650static u8 build_attr(struct vc_data *vc, u8 _color,
651 enum vc_intensity _intensity, bool _blink, bool _underline,
652 bool _reverse, bool _italic)
653{
654 if (vc->vc_sw->con_build_attr)
655 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
656 _blink, _underline, _reverse, _italic);
657
658/*
659 * ++roman: I completely changed the attribute format for monochrome
660 * mode (!can_do_color). The formerly used MDA (monochrome display
661 * adapter) format didn't allow the combination of certain effects.
662 * Now the attribute is just a bit vector:
663 * Bit 0..1: intensity (0..2)
664 * Bit 2 : underline
665 * Bit 3 : reverse
666 * Bit 7 : blink
667 */
668 {
669 u8 a = _color;
670 if (!vc->vc_can_do_color)
671 return _intensity |
672 (_italic << 1) |
673 (_underline << 2) |
674 (_reverse << 3) |
675 (_blink << 7);
676 if (_italic)
677 a = (a & 0xF0) | vc->vc_itcolor;
678 else if (_underline)
679 a = (a & 0xf0) | vc->vc_ulcolor;
680 else if (_intensity == VCI_HALF_BRIGHT)
681 a = (a & 0xf0) | vc->vc_halfcolor;
682 if (_reverse)
683 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
684 if (_blink)
685 a ^= 0x80;
686 if (_intensity == VCI_BOLD)
687 a ^= 0x08;
688 if (vc->vc_hi_font_mask == 0x100)
689 a <<= 1;
690 return a;
691 }
692}
693
694static void update_attr(struct vc_data *vc)
695{
696 vc->vc_attr = build_attr(vc, color: vc->state.color, intensity: vc->state.intensity,
697 blink: vc->state.blink, underline: vc->state.underline,
698 reverse: vc->state.reverse ^ vc->vc_decscnm, italic: vc->state.italic);
699 vc->vc_video_erase_char = ' ' | (build_attr(vc, color: vc->state.color,
700 intensity: VCI_NORMAL, blink: vc->state.blink, underline: false,
701 reverse: vc->vc_decscnm, italic: false) << 8);
702}
703
704/* Note: inverting the screen twice should revert to the original state */
705void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
706{
707 u16 *p;
708
709 WARN_CONSOLE_UNLOCKED();
710
711 count /= 2;
712 p = screenpos(vc, offset, viewed);
713 if (vc->vc_sw->con_invert_region) {
714 vc->vc_sw->con_invert_region(vc, p, count);
715 } else {
716 u16 *q = p;
717 int cnt = count;
718 u16 a;
719
720 if (!vc->vc_can_do_color) {
721 while (cnt--) {
722 a = scr_readw(q);
723 a ^= 0x0800;
724 scr_writew(a, q);
725 q++;
726 }
727 } else if (vc->vc_hi_font_mask == 0x100) {
728 while (cnt--) {
729 a = scr_readw(q);
730 a = (a & 0x11ff) |
731 ((a & 0xe000) >> 4) |
732 ((a & 0x0e00) << 4);
733 scr_writew(a, q);
734 q++;
735 }
736 } else {
737 while (cnt--) {
738 a = scr_readw(q);
739 a = (a & 0x88ff) |
740 ((a & 0x7000) >> 4) |
741 ((a & 0x0700) << 4);
742 scr_writew(a, q);
743 q++;
744 }
745 }
746 }
747
748 if (con_should_update(vc))
749 do_update_region(vc, start: (unsigned long) p, count);
750 notify_update(vc);
751}
752
753/* used by selection: complement pointer position */
754void complement_pos(struct vc_data *vc, int offset)
755{
756 static int old_offset = -1;
757 static unsigned short old;
758 static unsigned short oldx, oldy;
759
760 WARN_CONSOLE_UNLOCKED();
761
762 if (old_offset != -1 && old_offset >= 0 &&
763 old_offset < vc->vc_screenbuf_size) {
764 scr_writew(old, screenpos(vc, old_offset, true));
765 if (con_should_update(vc))
766 con_putc(vc, ca: old, y: oldy, x: oldx);
767 notify_update(vc);
768 }
769
770 old_offset = offset;
771
772 if (offset != -1 && offset >= 0 &&
773 offset < vc->vc_screenbuf_size) {
774 unsigned short new;
775 u16 *p = screenpos(vc, offset, viewed: true);
776 old = scr_readw(p);
777 new = old ^ vc->vc_complement_mask;
778 scr_writew(new, p);
779 if (con_should_update(vc)) {
780 oldx = (offset >> 1) % vc->vc_cols;
781 oldy = (offset >> 1) / vc->vc_cols;
782 con_putc(vc, ca: new, y: oldy, x: oldx);
783 }
784 notify_update(vc);
785 }
786}
787
788static void insert_char(struct vc_data *vc, unsigned int nr)
789{
790 unsigned short *p = (unsigned short *) vc->vc_pos;
791
792 vc_uniscr_insert(vc, nr);
793 scr_memmovew(d: p + nr, s: p, count: (vc->vc_cols - vc->state.x - nr) * 2);
794 scr_memsetw(s: p, c: vc->vc_video_erase_char, count: nr * 2);
795 vc->vc_need_wrap = 0;
796 if (con_should_update(vc))
797 do_update_region(vc, start: (unsigned long) p,
798 count: vc->vc_cols - vc->state.x);
799}
800
801static void delete_char(struct vc_data *vc, unsigned int nr)
802{
803 unsigned short *p = (unsigned short *) vc->vc_pos;
804
805 vc_uniscr_delete(vc, nr);
806 scr_memmovew(d: p, s: p + nr, count: (vc->vc_cols - vc->state.x - nr) * 2);
807 scr_memsetw(s: p + vc->vc_cols - vc->state.x - nr, c: vc->vc_video_erase_char,
808 count: nr * 2);
809 vc->vc_need_wrap = 0;
810 if (con_should_update(vc))
811 do_update_region(vc, start: (unsigned long) p,
812 count: vc->vc_cols - vc->state.x);
813}
814
815static int softcursor_original = -1;
816
817static void add_softcursor(struct vc_data *vc)
818{
819 int i = scr_readw((u16 *) vc->vc_pos);
820 u32 type = vc->vc_cursor_type;
821
822 if (!(type & CUR_SW))
823 return;
824 if (softcursor_original != -1)
825 return;
826 softcursor_original = i;
827 i |= CUR_SET(type);
828 i ^= CUR_CHANGE(type);
829 if ((type & CUR_ALWAYS_BG) &&
830 (softcursor_original & CUR_BG) == (i & CUR_BG))
831 i ^= CUR_BG;
832 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
833 i ^= CUR_FG;
834 scr_writew(i, (u16 *)vc->vc_pos);
835 if (con_should_update(vc))
836 con_putc(vc, ca: i, y: vc->state.y, x: vc->state.x);
837}
838
839static void hide_softcursor(struct vc_data *vc)
840{
841 if (softcursor_original != -1) {
842 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
843 if (con_should_update(vc))
844 con_putc(vc, ca: softcursor_original, y: vc->state.y,
845 x: vc->state.x);
846 softcursor_original = -1;
847 }
848}
849
850static void hide_cursor(struct vc_data *vc)
851{
852 if (vc_is_sel(vc))
853 clear_selection();
854
855 vc->vc_sw->con_cursor(vc, false);
856 hide_softcursor(vc);
857}
858
859static void set_cursor(struct vc_data *vc)
860{
861 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
862 return;
863 if (vc->vc_deccm) {
864 if (vc_is_sel(vc))
865 clear_selection();
866 add_softcursor(vc);
867 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
868 vc->vc_sw->con_cursor(vc, true);
869 } else
870 hide_cursor(vc);
871}
872
873static void set_origin(struct vc_data *vc)
874{
875 WARN_CONSOLE_UNLOCKED();
876
877 if (!con_is_visible(vc) ||
878 !vc->vc_sw->con_set_origin ||
879 !vc->vc_sw->con_set_origin(vc))
880 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
881 vc->vc_visible_origin = vc->vc_origin;
882 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
883 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
884 2 * vc->state.x;
885}
886
887static void save_screen(struct vc_data *vc)
888{
889 WARN_CONSOLE_UNLOCKED();
890
891 if (vc->vc_sw->con_save_screen)
892 vc->vc_sw->con_save_screen(vc);
893}
894
895static void flush_scrollback(struct vc_data *vc)
896{
897 WARN_CONSOLE_UNLOCKED();
898
899 set_origin(vc);
900 if (!con_is_visible(vc))
901 return;
902
903 /*
904 * The legacy way for flushing the scrollback buffer is to use a side
905 * effect of the con_switch method. We do it only on the foreground
906 * console as background consoles have no scrollback buffers in that
907 * case and we obviously don't want to switch to them.
908 */
909 hide_cursor(vc);
910 vc->vc_sw->con_switch(vc);
911 set_cursor(vc);
912}
913
914/*
915 * Redrawing of screen
916 */
917
918void clear_buffer_attributes(struct vc_data *vc)
919{
920 unsigned short *p = (unsigned short *)vc->vc_origin;
921 int count = vc->vc_screenbuf_size / 2;
922 int mask = vc->vc_hi_font_mask | 0xff;
923
924 for (; count > 0; count--, p++) {
925 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
926 }
927}
928
929void redraw_screen(struct vc_data *vc, int is_switch)
930{
931 int redraw = 0;
932
933 WARN_CONSOLE_UNLOCKED();
934
935 if (!vc) {
936 /* strange ... */
937 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
938 return;
939 }
940
941 if (is_switch) {
942 struct vc_data *old_vc = vc_cons[fg_console].d;
943 if (old_vc == vc)
944 return;
945 if (!con_is_visible(vc))
946 redraw = 1;
947 *vc->vc_display_fg = vc;
948 fg_console = vc->vc_num;
949 hide_cursor(vc: old_vc);
950 if (!con_is_visible(vc: old_vc)) {
951 save_screen(vc: old_vc);
952 set_origin(old_vc);
953 }
954 if (tty0dev)
955 sysfs_notify(kobj: &tty0dev->kobj, NULL, attr: "active");
956 } else {
957 hide_cursor(vc);
958 redraw = 1;
959 }
960
961 if (redraw) {
962 bool update;
963 int old_was_color = vc->vc_can_do_color;
964
965 set_origin(vc);
966 update = vc->vc_sw->con_switch(vc);
967 set_palette(vc);
968 /*
969 * If console changed from mono<->color, the best we can do
970 * is to clear the buffer attributes. As it currently stands,
971 * rebuilding new attributes from the old buffer is not doable
972 * without overly complex code.
973 */
974 if (old_was_color != vc->vc_can_do_color) {
975 update_attr(vc);
976 clear_buffer_attributes(vc);
977 }
978
979 if (update && vc->vc_mode != KD_GRAPHICS)
980 do_update_region(vc, start: vc->vc_origin, count: vc->vc_screenbuf_size / 2);
981 }
982 set_cursor(vc);
983 if (is_switch) {
984 vt_set_leds_compute_shiftstate();
985 notify_update(vc);
986 }
987}
988EXPORT_SYMBOL(redraw_screen);
989
990/*
991 * Allocation, freeing and resizing of VTs.
992 */
993
994int vc_cons_allocated(unsigned int i)
995{
996 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
997}
998
999static void visual_init(struct vc_data *vc, int num, bool init)
1000{
1001 /* ++Geert: vc->vc_sw->con_init determines console size */
1002 if (vc->vc_sw)
1003 module_put(module: vc->vc_sw->owner);
1004 vc->vc_sw = conswitchp;
1005
1006 if (con_driver_map[num])
1007 vc->vc_sw = con_driver_map[num];
1008
1009 __module_get(module: vc->vc_sw->owner);
1010 vc->vc_num = num;
1011 vc->vc_display_fg = &master_display_fg;
1012 if (vc->uni_pagedict_loc)
1013 con_free_unimap(vc);
1014 vc->uni_pagedict_loc = &vc->uni_pagedict;
1015 vc->uni_pagedict = NULL;
1016 vc->vc_hi_font_mask = 0;
1017 vc->vc_complement_mask = 0;
1018 vc->vc_can_do_color = 0;
1019 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1020 vc->vc_sw->con_init(vc, init);
1021 if (!vc->vc_complement_mask)
1022 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1023 vc->vc_s_complement_mask = vc->vc_complement_mask;
1024 vc->vc_size_row = vc->vc_cols << 1;
1025 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1026}
1027
1028
1029static void visual_deinit(struct vc_data *vc)
1030{
1031 vc->vc_sw->con_deinit(vc);
1032 module_put(module: vc->vc_sw->owner);
1033}
1034
1035static void vc_port_destruct(struct tty_port *port)
1036{
1037 struct vc_data *vc = container_of(port, struct vc_data, port);
1038
1039 kfree(objp: vc);
1040}
1041
1042static const struct tty_port_operations vc_port_ops = {
1043 .destruct = vc_port_destruct,
1044};
1045
1046/*
1047 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1048 * [this is to be used together with some user program
1049 * like resize that changes the hardware videomode]
1050 */
1051#define VC_MAXCOL (32767)
1052#define VC_MAXROW (32767)
1053
1054int vc_allocate(unsigned int currcons) /* return 0 on success */
1055{
1056 struct vt_notifier_param param;
1057 struct vc_data *vc;
1058 int err;
1059
1060 WARN_CONSOLE_UNLOCKED();
1061
1062 if (currcons >= MAX_NR_CONSOLES)
1063 return -ENXIO;
1064
1065 if (vc_cons[currcons].d)
1066 return 0;
1067
1068 /* due to the granularity of kmalloc, we waste some memory here */
1069 /* the alloc is done in two steps, to optimize the common situation
1070 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1071 /* although the numbers above are not valid since long ago, the
1072 point is still up-to-date and the comment still has its value
1073 even if only as a historical artifact. --mj, July 1998 */
1074 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1075 if (!vc)
1076 return -ENOMEM;
1077
1078 vc_cons[currcons].d = vc;
1079 tty_port_init(port: &vc->port);
1080 vc->port.ops = &vc_port_ops;
1081 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1082
1083 visual_init(vc, num: currcons, init: true);
1084
1085 if (!*vc->uni_pagedict_loc)
1086 con_set_default_unimap(vc);
1087
1088 err = -EINVAL;
1089 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1090 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1091 goto err_free;
1092 err = -ENOMEM;
1093 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1094 if (!vc->vc_screenbuf)
1095 goto err_free;
1096
1097 /* If no drivers have overridden us and the user didn't pass a
1098 boot option, default to displaying the cursor */
1099 if (global_cursor_default == -1)
1100 global_cursor_default = 1;
1101
1102 vc_init(vc, do_clear: 1);
1103 vcs_make_sysfs(index: currcons);
1104 atomic_notifier_call_chain(nh: &vt_notifier_list, VT_ALLOCATE, v: &param);
1105
1106 return 0;
1107err_free:
1108 visual_deinit(vc);
1109 kfree(objp: vc);
1110 vc_cons[currcons].d = NULL;
1111 return err;
1112}
1113
1114static inline int resize_screen(struct vc_data *vc, int width, int height,
1115 bool from_user)
1116{
1117 /* Resizes the resolution of the display adapater */
1118 int err = 0;
1119
1120 if (vc->vc_sw->con_resize)
1121 err = vc->vc_sw->con_resize(vc, width, height, from_user);
1122
1123 return err;
1124}
1125
1126/**
1127 * vc_do_resize - resizing method for the tty
1128 * @tty: tty being resized
1129 * @vc: virtual console private data
1130 * @cols: columns
1131 * @lines: lines
1132 * @from_user: invoked by a user?
1133 *
1134 * Resize a virtual console, clipping according to the actual constraints. If
1135 * the caller passes a tty structure then update the termios winsize
1136 * information and perform any necessary signal handling.
1137 *
1138 * Locking: Caller must hold the console semaphore. Takes the termios rwsem and
1139 * ctrl.lock of the tty IFF a tty is passed.
1140 */
1141static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1142 unsigned int cols, unsigned int lines, bool from_user)
1143{
1144 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1145 unsigned long end;
1146 unsigned int old_rows, old_row_size, first_copied_row;
1147 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1148 unsigned short *oldscreen, *newscreen;
1149 u32 **new_uniscr = NULL;
1150
1151 WARN_CONSOLE_UNLOCKED();
1152
1153 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1154 return -EINVAL;
1155
1156 new_cols = (cols ? cols : vc->vc_cols);
1157 new_rows = (lines ? lines : vc->vc_rows);
1158 new_row_size = new_cols << 1;
1159 new_screen_size = new_row_size * new_rows;
1160
1161 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1162 /*
1163 * This function is being called here to cover the case
1164 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1165 * passing the same fb_var_screeninfo containing the fields
1166 * yres/xres equal to a number non-multiple of vc_font.height
1167 * and yres_virtual/xres_virtual equal to number lesser than the
1168 * vc_font.height and yres/xres.
1169 * In the second call, the struct fb_var_screeninfo isn't
1170 * being modified by the underlying driver because of the
1171 * if above, and this causes the fbcon_display->vrows to become
1172 * negative and it eventually leads to out-of-bound
1173 * access by the imageblit function.
1174 * To give the correct values to the struct and to not have
1175 * to deal with possible errors from the code below, we call
1176 * the resize_screen here as well.
1177 */
1178 return resize_screen(vc, width: new_cols, height: new_rows, from_user);
1179 }
1180
1181 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1182 return -EINVAL;
1183 newscreen = kzalloc(new_screen_size, GFP_USER);
1184 if (!newscreen)
1185 return -ENOMEM;
1186
1187 if (vc->vc_uni_lines) {
1188 new_uniscr = vc_uniscr_alloc(cols: new_cols, rows: new_rows);
1189 if (!new_uniscr) {
1190 kfree(objp: newscreen);
1191 return -ENOMEM;
1192 }
1193 }
1194
1195 if (vc_is_sel(vc))
1196 clear_selection();
1197
1198 old_rows = vc->vc_rows;
1199 old_row_size = vc->vc_size_row;
1200
1201 err = resize_screen(vc, width: new_cols, height: new_rows, from_user);
1202 if (err) {
1203 kfree(objp: newscreen);
1204 vc_uniscr_free(uni_lines: new_uniscr);
1205 return err;
1206 }
1207
1208 vc->vc_rows = new_rows;
1209 vc->vc_cols = new_cols;
1210 vc->vc_size_row = new_row_size;
1211 vc->vc_screenbuf_size = new_screen_size;
1212
1213 rlth = min(old_row_size, new_row_size);
1214 rrem = new_row_size - rlth;
1215 old_origin = vc->vc_origin;
1216 new_origin = (long) newscreen;
1217 new_scr_end = new_origin + new_screen_size;
1218
1219 if (vc->state.y > new_rows) {
1220 if (old_rows - vc->state.y < new_rows) {
1221 /*
1222 * Cursor near the bottom, copy contents from the
1223 * bottom of buffer
1224 */
1225 first_copied_row = (old_rows - new_rows);
1226 } else {
1227 /*
1228 * Cursor is in no man's land, copy 1/2 screenful
1229 * from the top and bottom of cursor position
1230 */
1231 first_copied_row = (vc->state.y - new_rows/2);
1232 }
1233 old_origin += first_copied_row * old_row_size;
1234 } else
1235 first_copied_row = 0;
1236 end = old_origin + old_row_size * min(old_rows, new_rows);
1237
1238 vc_uniscr_copy_area(dst_lines: new_uniscr, dst_cols: new_cols, dst_rows: new_rows,
1239 src_lines: vc->vc_uni_lines, src_cols: rlth/2, src_top_row: first_copied_row,
1240 min(old_rows, new_rows));
1241 vc_uniscr_set(vc, new_uni_lines: new_uniscr);
1242
1243 update_attr(vc);
1244
1245 while (old_origin < end) {
1246 scr_memcpyw(d: (unsigned short *) new_origin,
1247 s: (unsigned short *) old_origin, count: rlth);
1248 if (rrem)
1249 scr_memsetw(s: (void *)(new_origin + rlth),
1250 c: vc->vc_video_erase_char, count: rrem);
1251 old_origin += old_row_size;
1252 new_origin += new_row_size;
1253 }
1254 if (new_scr_end > new_origin)
1255 scr_memsetw(s: (void *)new_origin, c: vc->vc_video_erase_char,
1256 count: new_scr_end - new_origin);
1257 oldscreen = vc->vc_screenbuf;
1258 vc->vc_screenbuf = newscreen;
1259 vc->vc_screenbuf_size = new_screen_size;
1260 set_origin(vc);
1261 kfree(objp: oldscreen);
1262
1263 /* do part of a reset_terminal() */
1264 vc->vc_top = 0;
1265 vc->vc_bottom = vc->vc_rows;
1266 gotoxy(vc, new_x: vc->state.x, new_y: vc->state.y);
1267 save_cur(vc);
1268
1269 if (tty) {
1270 /* Rewrite the requested winsize data with the actual
1271 resulting sizes */
1272 struct winsize ws;
1273 memset(s: &ws, c: 0, n: sizeof(ws));
1274 ws.ws_row = vc->vc_rows;
1275 ws.ws_col = vc->vc_cols;
1276 ws.ws_ypixel = vc->vc_scan_lines;
1277 tty_do_resize(tty, ws: &ws);
1278 }
1279
1280 if (con_is_visible(vc))
1281 update_screen(vc);
1282 vt_event_post(VT_EVENT_RESIZE, old: vc->vc_num, new: vc->vc_num);
1283 notify_update(vc);
1284 return err;
1285}
1286
1287/**
1288 * __vc_resize - resize a VT
1289 * @vc: virtual console
1290 * @cols: columns
1291 * @rows: rows
1292 * @from_user: invoked by a user?
1293 *
1294 * Resize a virtual console as seen from the console end of things. We use the
1295 * common vc_do_resize() method to update the structures.
1296 *
1297 * Locking: The caller must hold the console sem to protect console internals
1298 * and @vc->port.tty.
1299 */
1300int __vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows,
1301 bool from_user)
1302{
1303 return vc_do_resize(tty: vc->port.tty, vc, cols, lines: rows, from_user);
1304}
1305EXPORT_SYMBOL(__vc_resize);
1306
1307/**
1308 * vt_resize - resize a VT
1309 * @tty: tty to resize
1310 * @ws: winsize attributes
1311 *
1312 * Resize a virtual terminal. This is called by the tty layer as we register
1313 * our own handler for resizing. The mutual helper does all the actual work.
1314 *
1315 * Locking: Takes the console sem and the called methods then take the tty
1316 * termios_rwsem and the tty ctrl.lock in that order.
1317 */
1318static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1319{
1320 struct vc_data *vc = tty->driver_data;
1321
1322 guard(console_lock)();
1323 return vc_do_resize(tty, vc, cols: ws->ws_col, lines: ws->ws_row, from_user: false);
1324}
1325
1326struct vc_data *vc_deallocate(unsigned int currcons)
1327{
1328 struct vc_data *vc = NULL;
1329
1330 WARN_CONSOLE_UNLOCKED();
1331
1332 if (vc_cons_allocated(i: currcons)) {
1333 struct vt_notifier_param param;
1334
1335 param.vc = vc = vc_cons[currcons].d;
1336 atomic_notifier_call_chain(nh: &vt_notifier_list, VT_DEALLOCATE, v: &param);
1337 vcs_remove_sysfs(index: currcons);
1338 visual_deinit(vc);
1339 con_free_unimap(vc);
1340 put_pid(pid: vc->vt_pid);
1341 vc_uniscr_set(vc, NULL);
1342 kfree(objp: vc->vc_screenbuf);
1343 vc_cons[currcons].d = NULL;
1344 if (vc->vc_saved_screen != NULL) {
1345 kfree(objp: vc->vc_saved_screen);
1346 vc->vc_saved_screen = NULL;
1347 }
1348 }
1349 return vc;
1350}
1351
1352/*
1353 * VT102 emulator
1354 */
1355
1356enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1357
1358#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1359#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1360#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1361
1362#define decarm VC_REPEAT
1363#define decckm VC_CKMODE
1364#define kbdapplic VC_APPLIC
1365#define lnm VC_CRLF
1366
1367const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1368 8,12,10,14, 9,13,11,15 };
1369EXPORT_SYMBOL(color_table);
1370
1371/* the default colour table, for VGA+ colour systems */
1372unsigned char default_red[] = {
1373 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1374 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1375};
1376module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1377EXPORT_SYMBOL(default_red);
1378
1379unsigned char default_grn[] = {
1380 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1381 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1382};
1383module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1384EXPORT_SYMBOL(default_grn);
1385
1386unsigned char default_blu[] = {
1387 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1388 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1389};
1390module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1391EXPORT_SYMBOL(default_blu);
1392
1393/*
1394 * gotoxy() must verify all boundaries, because the arguments
1395 * might also be negative. If the given position is out of
1396 * bounds, the cursor is placed at the nearest margin.
1397 */
1398static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1399{
1400 int min_y, max_y;
1401
1402 if (new_x < 0)
1403 vc->state.x = 0;
1404 else {
1405 if (new_x >= vc->vc_cols)
1406 vc->state.x = vc->vc_cols - 1;
1407 else
1408 vc->state.x = new_x;
1409 }
1410
1411 if (vc->vc_decom) {
1412 min_y = vc->vc_top;
1413 max_y = vc->vc_bottom;
1414 } else {
1415 min_y = 0;
1416 max_y = vc->vc_rows;
1417 }
1418 if (new_y < min_y)
1419 vc->state.y = min_y;
1420 else if (new_y >= max_y)
1421 vc->state.y = max_y - 1;
1422 else
1423 vc->state.y = new_y;
1424 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1425 (vc->state.x << 1);
1426 vc->vc_need_wrap = 0;
1427}
1428
1429/* for absolute user moves, when decom is set */
1430static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1431{
1432 gotoxy(vc, new_x, new_y: vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1433}
1434
1435void scrollback(struct vc_data *vc)
1436{
1437 scrolldelta(lines: -(vc->vc_rows / 2));
1438}
1439
1440void scrollfront(struct vc_data *vc, int lines)
1441{
1442 if (!lines)
1443 lines = vc->vc_rows / 2;
1444 scrolldelta(lines);
1445}
1446
1447static void lf(struct vc_data *vc)
1448{
1449 /* don't scroll if above bottom of scrolling region, or
1450 * if below scrolling region
1451 */
1452 if (vc->state.y + 1 == vc->vc_bottom)
1453 con_scroll(vc, top: vc->vc_top, bottom: vc->vc_bottom, dir: SM_UP, nr: 1);
1454 else if (vc->state.y < vc->vc_rows - 1) {
1455 vc->state.y++;
1456 vc->vc_pos += vc->vc_size_row;
1457 }
1458 vc->vc_need_wrap = 0;
1459 notify_write(vc, unicode: '\n');
1460}
1461
1462static void ri(struct vc_data *vc)
1463{
1464 /* don't scroll if below top of scrolling region, or
1465 * if above scrolling region
1466 */
1467 if (vc->state.y == vc->vc_top)
1468 con_scroll(vc, top: vc->vc_top, bottom: vc->vc_bottom, dir: SM_DOWN, nr: 1);
1469 else if (vc->state.y > 0) {
1470 vc->state.y--;
1471 vc->vc_pos -= vc->vc_size_row;
1472 }
1473 vc->vc_need_wrap = 0;
1474}
1475
1476static inline void cr(struct vc_data *vc)
1477{
1478 vc->vc_pos -= vc->state.x << 1;
1479 vc->vc_need_wrap = vc->state.x = 0;
1480 notify_write(vc, unicode: '\r');
1481}
1482
1483static inline void bs(struct vc_data *vc)
1484{
1485 if (vc->state.x) {
1486 vc->vc_pos -= 2;
1487 vc->state.x--;
1488 vc->vc_need_wrap = 0;
1489 notify_write(vc, unicode: '\b');
1490 }
1491}
1492
1493static inline void del(struct vc_data *vc)
1494{
1495 /* ignored */
1496}
1497
1498enum CSI_J {
1499 CSI_J_CURSOR_TO_END = 0,
1500 CSI_J_START_TO_CURSOR = 1,
1501 CSI_J_VISIBLE = 2,
1502 CSI_J_FULL = 3,
1503};
1504
1505static void csi_J(struct vc_data *vc, enum CSI_J vpar)
1506{
1507 unsigned short *start;
1508 unsigned int count;
1509
1510 switch (vpar) {
1511 case CSI_J_CURSOR_TO_END:
1512 vc_uniscr_clear_line(vc, x: vc->state.x,
1513 nr: vc->vc_cols - vc->state.x);
1514 vc_uniscr_clear_lines(vc, y: vc->state.y + 1,
1515 nr: vc->vc_rows - vc->state.y - 1);
1516 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1517 start = (unsigned short *)vc->vc_pos;
1518 break;
1519 case CSI_J_START_TO_CURSOR:
1520 vc_uniscr_clear_line(vc, x: 0, nr: vc->state.x + 1);
1521 vc_uniscr_clear_lines(vc, y: 0, nr: vc->state.y);
1522 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1523 start = (unsigned short *)vc->vc_origin;
1524 break;
1525 case CSI_J_FULL:
1526 flush_scrollback(vc);
1527 fallthrough;
1528 case CSI_J_VISIBLE:
1529 vc_uniscr_clear_lines(vc, y: 0, nr: vc->vc_rows);
1530 count = vc->vc_cols * vc->vc_rows;
1531 start = (unsigned short *)vc->vc_origin;
1532 break;
1533 default:
1534 return;
1535 }
1536 scr_memsetw(s: start, c: vc->vc_video_erase_char, count: 2 * count);
1537 if (con_should_update(vc))
1538 do_update_region(vc, start: (unsigned long) start, count);
1539 vc->vc_need_wrap = 0;
1540}
1541
1542enum {
1543 CSI_K_CURSOR_TO_LINEEND = 0,
1544 CSI_K_LINESTART_TO_CURSOR = 1,
1545 CSI_K_LINE = 2,
1546};
1547
1548static void csi_K(struct vc_data *vc)
1549{
1550 unsigned int count;
1551 unsigned short *start = (unsigned short *)vc->vc_pos;
1552 int offset;
1553
1554 switch (vc->vc_par[0]) {
1555 case CSI_K_CURSOR_TO_LINEEND:
1556 offset = 0;
1557 count = vc->vc_cols - vc->state.x;
1558 break;
1559 case CSI_K_LINESTART_TO_CURSOR:
1560 offset = -vc->state.x;
1561 count = vc->state.x + 1;
1562 break;
1563 case CSI_K_LINE:
1564 offset = -vc->state.x;
1565 count = vc->vc_cols;
1566 break;
1567 default:
1568 return;
1569 }
1570 vc_uniscr_clear_line(vc, x: vc->state.x + offset, nr: count);
1571 scr_memsetw(s: start + offset, c: vc->vc_video_erase_char, count: 2 * count);
1572 vc->vc_need_wrap = 0;
1573 if (con_should_update(vc))
1574 do_update_region(vc, start: (unsigned long)(start + offset), count);
1575}
1576
1577/* erase the following count positions */
1578static void csi_X(struct vc_data *vc)
1579{ /* not vt100? */
1580 unsigned int count = clamp(vc->vc_par[0], 1, vc->vc_cols - vc->state.x);
1581
1582 vc_uniscr_clear_line(vc, x: vc->state.x, nr: count);
1583 scr_memsetw(s: (unsigned short *)vc->vc_pos, c: vc->vc_video_erase_char, count: 2 * count);
1584 if (con_should_update(vc))
1585 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, count);
1586 vc->vc_need_wrap = 0;
1587}
1588
1589static void default_attr(struct vc_data *vc)
1590{
1591 vc->state.intensity = VCI_NORMAL;
1592 vc->state.italic = false;
1593 vc->state.underline = false;
1594 vc->state.reverse = false;
1595 vc->state.blink = false;
1596 vc->state.color = vc->vc_def_color;
1597}
1598
1599struct rgb { u8 r; u8 g; u8 b; };
1600
1601static void rgb_from_256(unsigned int i, struct rgb *c)
1602{
1603 if (i < 8) { /* Standard colours. */
1604 c->r = i&1 ? 0xaa : 0x00;
1605 c->g = i&2 ? 0xaa : 0x00;
1606 c->b = i&4 ? 0xaa : 0x00;
1607 } else if (i < 16) {
1608 c->r = i&1 ? 0xff : 0x55;
1609 c->g = i&2 ? 0xff : 0x55;
1610 c->b = i&4 ? 0xff : 0x55;
1611 } else if (i < 232) { /* 6x6x6 colour cube. */
1612 i -= 16;
1613 c->b = i % 6 * 255 / 6;
1614 i /= 6;
1615 c->g = i % 6 * 255 / 6;
1616 i /= 6;
1617 c->r = i * 255 / 6;
1618 } else /* Grayscale ramp. */
1619 c->r = c->g = c->b = i * 10 - 2312;
1620}
1621
1622static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1623{
1624 u8 hue = 0, max = max3(c->r, c->g, c->b);
1625
1626 if (c->r > max / 2)
1627 hue |= 4;
1628 if (c->g > max / 2)
1629 hue |= 2;
1630 if (c->b > max / 2)
1631 hue |= 1;
1632
1633 if (hue == 7 && max <= 0x55) {
1634 hue = 0;
1635 vc->state.intensity = VCI_BOLD;
1636 } else if (max > 0xaa)
1637 vc->state.intensity = VCI_BOLD;
1638 else
1639 vc->state.intensity = VCI_NORMAL;
1640
1641 vc->state.color = (vc->state.color & 0xf0) | hue;
1642}
1643
1644static void rgb_background(struct vc_data *vc, const struct rgb *c)
1645{
1646 /* For backgrounds, err on the dark side. */
1647 vc->state.color = (vc->state.color & 0x0f)
1648 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1649}
1650
1651/*
1652 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1653 * and thus need to be detected and ignored by hand. That standard also
1654 * wants : rather than ; as separators but sequences containing : are currently
1655 * completely ignored by the parser.
1656 *
1657 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1658 * supporting them.
1659 */
1660static int vc_t416_color(struct vc_data *vc, int i,
1661 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1662{
1663 struct rgb c;
1664
1665 i++;
1666 if (i > vc->vc_npar)
1667 return i;
1668
1669 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1670 /* 256 colours */
1671 i++;
1672 rgb_from_256(i: vc->vc_par[i], c: &c);
1673 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1674 /* 24 bit */
1675 c.r = vc->vc_par[i + 1];
1676 c.g = vc->vc_par[i + 2];
1677 c.b = vc->vc_par[i + 3];
1678 i += 3;
1679 } else
1680 return i;
1681
1682 set_color(vc, &c);
1683
1684 return i;
1685}
1686
1687enum {
1688 CSI_m_DEFAULT = 0,
1689 CSI_m_BOLD = 1,
1690 CSI_m_HALF_BRIGHT = 2,
1691 CSI_m_ITALIC = 3,
1692 CSI_m_UNDERLINE = 4,
1693 CSI_m_BLINK = 5,
1694 CSI_m_REVERSE = 7,
1695 CSI_m_PRI_FONT = 10,
1696 CSI_m_ALT_FONT1 = 11,
1697 CSI_m_ALT_FONT2 = 12,
1698 CSI_m_DOUBLE_UNDERLINE = 21,
1699 CSI_m_NORMAL_INTENSITY = 22,
1700 CSI_m_NO_ITALIC = 23,
1701 CSI_m_NO_UNDERLINE = 24,
1702 CSI_m_NO_BLINK = 25,
1703 CSI_m_NO_REVERSE = 27,
1704 CSI_m_FG_COLOR_BEG = 30,
1705 CSI_m_FG_COLOR_END = 37,
1706 CSI_m_FG_COLOR = 38,
1707 CSI_m_DEFAULT_FG_COLOR = 39,
1708 CSI_m_BG_COLOR_BEG = 40,
1709 CSI_m_BG_COLOR_END = 47,
1710 CSI_m_BG_COLOR = 48,
1711 CSI_m_DEFAULT_BG_COLOR = 49,
1712 CSI_m_BRIGHT_FG_COLOR_BEG = 90,
1713 CSI_m_BRIGHT_FG_COLOR_END = 97,
1714 CSI_m_BRIGHT_FG_COLOR_OFF = CSI_m_BRIGHT_FG_COLOR_BEG - CSI_m_FG_COLOR_BEG,
1715 CSI_m_BRIGHT_BG_COLOR_BEG = 100,
1716 CSI_m_BRIGHT_BG_COLOR_END = 107,
1717 CSI_m_BRIGHT_BG_COLOR_OFF = CSI_m_BRIGHT_BG_COLOR_BEG - CSI_m_BG_COLOR_BEG,
1718};
1719
1720/* console_lock is held */
1721static void csi_m(struct vc_data *vc)
1722{
1723 int i;
1724
1725 for (i = 0; i <= vc->vc_npar; i++)
1726 switch (vc->vc_par[i]) {
1727 case CSI_m_DEFAULT: /* all attributes off */
1728 default_attr(vc);
1729 break;
1730 case CSI_m_BOLD:
1731 vc->state.intensity = VCI_BOLD;
1732 break;
1733 case CSI_m_HALF_BRIGHT:
1734 vc->state.intensity = VCI_HALF_BRIGHT;
1735 break;
1736 case CSI_m_ITALIC:
1737 vc->state.italic = true;
1738 break;
1739 case CSI_m_DOUBLE_UNDERLINE:
1740 /*
1741 * No console drivers support double underline, so
1742 * convert it to a single underline.
1743 */
1744 case CSI_m_UNDERLINE:
1745 vc->state.underline = true;
1746 break;
1747 case CSI_m_BLINK:
1748 vc->state.blink = true;
1749 break;
1750 case CSI_m_REVERSE:
1751 vc->state.reverse = true;
1752 break;
1753 case CSI_m_PRI_FONT: /* ANSI X3.64-1979 (SCO-ish?)
1754 * Select primary font, don't display control chars if
1755 * defined, don't set bit 8 on output.
1756 */
1757 vc->vc_translate = set_translate(m: vc->state.Gx_charset[vc->state.charset], vc);
1758 vc->vc_disp_ctrl = 0;
1759 vc->vc_toggle_meta = 0;
1760 break;
1761 case CSI_m_ALT_FONT1: /* ANSI X3.64-1979 (SCO-ish?)
1762 * Select first alternate font, lets chars < 32 be
1763 * displayed as ROM chars.
1764 */
1765 vc->vc_translate = set_translate(m: IBMPC_MAP, vc);
1766 vc->vc_disp_ctrl = 1;
1767 vc->vc_toggle_meta = 0;
1768 break;
1769 case CSI_m_ALT_FONT2: /* ANSI X3.64-1979 (SCO-ish?)
1770 * Select second alternate font, toggle high bit
1771 * before displaying as ROM char.
1772 */
1773 vc->vc_translate = set_translate(m: IBMPC_MAP, vc);
1774 vc->vc_disp_ctrl = 1;
1775 vc->vc_toggle_meta = 1;
1776 break;
1777 case CSI_m_NORMAL_INTENSITY:
1778 vc->state.intensity = VCI_NORMAL;
1779 break;
1780 case CSI_m_NO_ITALIC:
1781 vc->state.italic = false;
1782 break;
1783 case CSI_m_NO_UNDERLINE:
1784 vc->state.underline = false;
1785 break;
1786 case CSI_m_NO_BLINK:
1787 vc->state.blink = false;
1788 break;
1789 case CSI_m_NO_REVERSE:
1790 vc->state.reverse = false;
1791 break;
1792 case CSI_m_FG_COLOR:
1793 i = vc_t416_color(vc, i, set_color: rgb_foreground);
1794 break;
1795 case CSI_m_BG_COLOR:
1796 i = vc_t416_color(vc, i, set_color: rgb_background);
1797 break;
1798 case CSI_m_DEFAULT_FG_COLOR:
1799 vc->state.color = (vc->vc_def_color & 0x0f) |
1800 (vc->state.color & 0xf0);
1801 break;
1802 case CSI_m_DEFAULT_BG_COLOR:
1803 vc->state.color = (vc->vc_def_color & 0xf0) |
1804 (vc->state.color & 0x0f);
1805 break;
1806 case CSI_m_BRIGHT_FG_COLOR_BEG ... CSI_m_BRIGHT_FG_COLOR_END:
1807 vc->state.intensity = VCI_BOLD;
1808 vc->vc_par[i] -= CSI_m_BRIGHT_FG_COLOR_OFF;
1809 fallthrough;
1810 case CSI_m_FG_COLOR_BEG ... CSI_m_FG_COLOR_END:
1811 vc->vc_par[i] -= CSI_m_FG_COLOR_BEG;
1812 vc->state.color = color_table[vc->vc_par[i]] |
1813 (vc->state.color & 0xf0);
1814 break;
1815 case CSI_m_BRIGHT_BG_COLOR_BEG ... CSI_m_BRIGHT_BG_COLOR_END:
1816 vc->vc_par[i] -= CSI_m_BRIGHT_BG_COLOR_OFF;
1817 fallthrough;
1818 case CSI_m_BG_COLOR_BEG ... CSI_m_BG_COLOR_END:
1819 vc->vc_par[i] -= CSI_m_BG_COLOR_BEG;
1820 vc->state.color = (color_table[vc->vc_par[i]] << 4) |
1821 (vc->state.color & 0x0f);
1822 break;
1823 }
1824 update_attr(vc);
1825}
1826
1827static void respond_string(const char *p, size_t len, struct tty_port *port)
1828{
1829 tty_insert_flip_string(port, chars: p, size: len);
1830 tty_flip_buffer_push(port);
1831}
1832
1833static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1834{
1835 char buf[40];
1836 int len;
1837
1838 len = sprintf(buf, fmt: "\033[%d;%dR", vc->state.y +
1839 (vc->vc_decom ? vc->vc_top + 1 : 1),
1840 vc->state.x + 1);
1841 respond_string(p: buf, len, port: tty->port);
1842}
1843
1844static inline void status_report(struct tty_struct *tty)
1845{
1846 static const char teminal_ok[] = "\033[0n";
1847
1848 respond_string(p: teminal_ok, len: strlen(teminal_ok), port: tty->port);
1849}
1850
1851static inline void respond_ID(struct tty_struct *tty)
1852{
1853 /* terminal answer to an ESC-Z or csi0c query. */
1854 static const char vt102_id[] = "\033[?6c";
1855
1856 respond_string(p: vt102_id, len: strlen(vt102_id), port: tty->port);
1857}
1858
1859void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1860{
1861 char buf[8];
1862 int len;
1863
1864 len = sprintf(buf, fmt: "\033[M%c%c%c", (char)(' ' + butt),
1865 (char)('!' + mrx), (char)('!' + mry));
1866 respond_string(p: buf, len, port: tty->port);
1867}
1868
1869/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1870int mouse_reporting(void)
1871{
1872 return vc_cons[fg_console].d->vc_report_mouse;
1873}
1874
1875/* invoked via ioctl(TIOCLINUX) */
1876static int get_bracketed_paste(struct tty_struct *tty)
1877{
1878 struct vc_data *vc = tty->driver_data;
1879
1880 return vc->vc_bracketed_paste;
1881}
1882
1883/* console_lock is held */
1884static void enter_alt_screen(struct vc_data *vc)
1885{
1886 unsigned int size = vc->vc_rows * vc->vc_cols * 2;
1887
1888 if (vc->vc_saved_screen != NULL)
1889 return; /* Already inside an alt-screen */
1890 vc->vc_saved_screen = kmemdup((u16 *)vc->vc_origin, size, GFP_KERNEL);
1891 if (vc->vc_saved_screen == NULL)
1892 return;
1893 vc->vc_saved_rows = vc->vc_rows;
1894 vc->vc_saved_cols = vc->vc_cols;
1895 save_cur(vc);
1896 /* clear entire screen */
1897 csi_J(vc, vpar: CSI_J_FULL);
1898}
1899
1900/* console_lock is held */
1901static void leave_alt_screen(struct vc_data *vc)
1902{
1903 unsigned int rows = min(vc->vc_saved_rows, vc->vc_rows);
1904 unsigned int cols = min(vc->vc_saved_cols, vc->vc_cols);
1905 u16 *src, *dest;
1906
1907 if (vc->vc_saved_screen == NULL)
1908 return; /* Not inside an alt-screen */
1909 for (unsigned int r = 0; r < rows; r++) {
1910 src = vc->vc_saved_screen + r * vc->vc_saved_cols;
1911 dest = ((u16 *)vc->vc_origin) + r * vc->vc_cols;
1912 memcpy(to: dest, from: src, len: 2 * cols);
1913 }
1914 restore_cur(vc);
1915 /* Update the entire screen */
1916 if (con_should_update(vc))
1917 do_update_region(vc, start: vc->vc_origin, count: vc->vc_screenbuf_size / 2);
1918 kfree(objp: vc->vc_saved_screen);
1919 vc->vc_saved_screen = NULL;
1920}
1921
1922enum {
1923 CSI_DEC_hl_CURSOR_KEYS = 1, /* CKM: cursor keys send ^[Ox/^[[x */
1924 CSI_DEC_hl_132_COLUMNS = 3, /* COLM: 80/132 mode switch */
1925 CSI_DEC_hl_REVERSE_VIDEO = 5, /* SCNM */
1926 CSI_DEC_hl_ORIGIN_MODE = 6, /* OM: origin relative/absolute */
1927 CSI_DEC_hl_AUTOWRAP = 7, /* AWM */
1928 CSI_DEC_hl_AUTOREPEAT = 8, /* ARM */
1929 CSI_DEC_hl_MOUSE_X10 = 9,
1930 CSI_DEC_hl_SHOW_CURSOR = 25, /* TCEM */
1931 CSI_DEC_hl_MOUSE_VT200 = 1000,
1932 CSI_DEC_hl_ALT_SCREEN = 1049,
1933 CSI_DEC_hl_BRACKETED_PASTE = 2004,
1934};
1935
1936/* console_lock is held */
1937static void csi_DEC_hl(struct vc_data *vc, bool on_off)
1938{
1939 unsigned int i;
1940
1941 for (i = 0; i <= vc->vc_npar; i++)
1942 switch (vc->vc_par[i]) {
1943 case CSI_DEC_hl_CURSOR_KEYS:
1944 if (on_off)
1945 set_kbd(vc, decckm);
1946 else
1947 clr_kbd(vc, decckm);
1948 break;
1949 case CSI_DEC_hl_132_COLUMNS: /* unimplemented */
1950#if 0
1951 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1952 /* this alone does not suffice; some user mode
1953 utility has to change the hardware regs */
1954#endif
1955 break;
1956 case CSI_DEC_hl_REVERSE_VIDEO:
1957 if (vc->vc_decscnm != on_off) {
1958 vc->vc_decscnm = on_off;
1959 invert_screen(vc, offset: 0, count: vc->vc_screenbuf_size,
1960 viewed: false);
1961 update_attr(vc);
1962 }
1963 break;
1964 case CSI_DEC_hl_ORIGIN_MODE:
1965 vc->vc_decom = on_off;
1966 gotoxay(vc, new_x: 0, new_y: 0);
1967 break;
1968 case CSI_DEC_hl_AUTOWRAP:
1969 vc->vc_decawm = on_off;
1970 break;
1971 case CSI_DEC_hl_AUTOREPEAT:
1972 if (on_off)
1973 set_kbd(vc, decarm);
1974 else
1975 clr_kbd(vc, decarm);
1976 break;
1977 case CSI_DEC_hl_MOUSE_X10:
1978 vc->vc_report_mouse = on_off ? 1 : 0;
1979 break;
1980 case CSI_DEC_hl_SHOW_CURSOR:
1981 vc->vc_deccm = on_off;
1982 break;
1983 case CSI_DEC_hl_MOUSE_VT200:
1984 vc->vc_report_mouse = on_off ? 2 : 0;
1985 break;
1986 case CSI_DEC_hl_BRACKETED_PASTE:
1987 vc->vc_bracketed_paste = on_off;
1988 break;
1989 case CSI_DEC_hl_ALT_SCREEN:
1990 if (on_off)
1991 enter_alt_screen(vc);
1992 else
1993 leave_alt_screen(vc);
1994 break;
1995 }
1996}
1997
1998enum {
1999 CSI_hl_DISPLAY_CTRL = 3, /* handle ansi control chars */
2000 CSI_hl_INSERT = 4, /* IRM: insert/replace */
2001 CSI_hl_AUTO_NL = 20, /* LNM: Enter == CrLf/Lf */
2002};
2003
2004/* console_lock is held */
2005static void csi_hl(struct vc_data *vc, bool on_off)
2006{
2007 unsigned int i;
2008
2009 for (i = 0; i <= vc->vc_npar; i++)
2010 switch (vc->vc_par[i]) { /* ANSI modes set/reset */
2011 case CSI_hl_DISPLAY_CTRL:
2012 vc->vc_disp_ctrl = on_off;
2013 break;
2014 case CSI_hl_INSERT:
2015 vc->vc_decim = on_off;
2016 break;
2017 case CSI_hl_AUTO_NL:
2018 if (on_off)
2019 set_kbd(vc, lnm);
2020 else
2021 clr_kbd(vc, lnm);
2022 break;
2023 }
2024}
2025
2026enum CSI_right_square_bracket {
2027 CSI_RSB_COLOR_FOR_UNDERLINE = 1,
2028 CSI_RSB_COLOR_FOR_HALF_BRIGHT = 2,
2029 CSI_RSB_MAKE_CUR_COLOR_DEFAULT = 8,
2030 CSI_RSB_BLANKING_INTERVAL = 9,
2031 CSI_RSB_BELL_FREQUENCY = 10,
2032 CSI_RSB_BELL_DURATION = 11,
2033 CSI_RSB_BRING_CONSOLE_TO_FRONT = 12,
2034 CSI_RSB_UNBLANK = 13,
2035 CSI_RSB_VESA_OFF_INTERVAL = 14,
2036 CSI_RSB_BRING_PREV_CONSOLE_TO_FRONT = 15,
2037 CSI_RSB_CURSOR_BLINK_INTERVAL = 16,
2038};
2039
2040/*
2041 * csi_RSB - csi+] (Right Square Bracket) handler
2042 *
2043 * These are linux console private sequences.
2044 *
2045 * console_lock is held
2046 */
2047static void csi_RSB(struct vc_data *vc)
2048{
2049 switch (vc->vc_par[0]) {
2050 case CSI_RSB_COLOR_FOR_UNDERLINE:
2051 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
2052 vc->vc_ulcolor = color_table[vc->vc_par[1]];
2053 if (vc->state.underline)
2054 update_attr(vc);
2055 }
2056 break;
2057 case CSI_RSB_COLOR_FOR_HALF_BRIGHT:
2058 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
2059 vc->vc_halfcolor = color_table[vc->vc_par[1]];
2060 if (vc->state.intensity == VCI_HALF_BRIGHT)
2061 update_attr(vc);
2062 }
2063 break;
2064 case CSI_RSB_MAKE_CUR_COLOR_DEFAULT:
2065 vc->vc_def_color = vc->vc_attr;
2066 if (vc->vc_hi_font_mask == 0x100)
2067 vc->vc_def_color >>= 1;
2068 default_attr(vc);
2069 update_attr(vc);
2070 break;
2071 case CSI_RSB_BLANKING_INTERVAL:
2072 blankinterval = min(vc->vc_par[1], 60U) * 60;
2073 poke_blanked_console();
2074 break;
2075 case CSI_RSB_BELL_FREQUENCY:
2076 if (vc->vc_npar >= 1)
2077 vc->vc_bell_pitch = vc->vc_par[1];
2078 else
2079 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2080 break;
2081 case CSI_RSB_BELL_DURATION:
2082 if (vc->vc_npar >= 1)
2083 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
2084 msecs_to_jiffies(m: vc->vc_par[1]) : 0;
2085 else
2086 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2087 break;
2088 case CSI_RSB_BRING_CONSOLE_TO_FRONT:
2089 if (vc->vc_par[1] >= 1 && vc_cons_allocated(i: vc->vc_par[1] - 1))
2090 set_console(vc->vc_par[1] - 1);
2091 break;
2092 case CSI_RSB_UNBLANK:
2093 poke_blanked_console();
2094 break;
2095 case CSI_RSB_VESA_OFF_INTERVAL:
2096 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
2097 break;
2098 case CSI_RSB_BRING_PREV_CONSOLE_TO_FRONT:
2099 set_console(last_console);
2100 break;
2101 case CSI_RSB_CURSOR_BLINK_INTERVAL:
2102 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
2103 vc->vc_par[1] <= USHRT_MAX)
2104 vc->vc_cur_blink_ms = vc->vc_par[1];
2105 else
2106 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2107 break;
2108 }
2109}
2110
2111/* console_lock is held */
2112static void csi_at(struct vc_data *vc, unsigned int nr)
2113{
2114 nr = clamp(nr, 1, vc->vc_cols - vc->state.x);
2115 insert_char(vc, nr);
2116}
2117
2118/* console_lock is held */
2119static void csi_L(struct vc_data *vc)
2120{
2121 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_rows - vc->state.y);
2122
2123 con_scroll(vc, top: vc->state.y, bottom: vc->vc_bottom, dir: SM_DOWN, nr);
2124 vc->vc_need_wrap = 0;
2125}
2126
2127/* console_lock is held */
2128static void csi_P(struct vc_data *vc)
2129{
2130 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_cols - vc->state.x);
2131
2132 delete_char(vc, nr);
2133}
2134
2135/* console_lock is held */
2136static void csi_M(struct vc_data *vc)
2137{
2138 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_rows - vc->state.y);
2139
2140 con_scroll(vc, top: vc->state.y, bottom: vc->vc_bottom, dir: SM_UP, nr);
2141 vc->vc_need_wrap = 0;
2142}
2143
2144/* console_lock is held (except via vc_init->reset_terminal */
2145static void save_cur(struct vc_data *vc)
2146{
2147 memcpy(to: &vc->saved_state, from: &vc->state, len: sizeof(vc->state));
2148}
2149
2150/* console_lock is held */
2151static void restore_cur(struct vc_data *vc)
2152{
2153 memcpy(to: &vc->state, from: &vc->saved_state, len: sizeof(vc->state));
2154
2155 gotoxy(vc, new_x: vc->state.x, new_y: vc->state.y);
2156 vc->vc_translate = set_translate(m: vc->state.Gx_charset[vc->state.charset],
2157 vc);
2158 update_attr(vc);
2159 vc->vc_need_wrap = 0;
2160}
2161
2162/**
2163 * enum vc_ctl_state - control characters state of a vt
2164 *
2165 * @ESnormal: initial state, no control characters parsed
2166 * @ESesc: ESC parsed
2167 * @ESsquare: CSI parsed -- modifiers/parameters/ctrl chars expected
2168 * @ESgetpars: CSI parsed -- parameters/ctrl chars expected
2169 * @ESfunckey: CSI [ parsed
2170 * @EShash: ESC # parsed
2171 * @ESsetG0: ESC ( parsed
2172 * @ESsetG1: ESC ) parsed
2173 * @ESpercent: ESC % parsed
2174 * @EScsiignore: CSI [0x20-0x3f] parsed
2175 * @ESnonstd: OSC parsed
2176 * @ESpalette: OSC P parsed
2177 * @ESosc: OSC [0-9] parsed
2178 * @ESANSI_first: first state for ignoring ansi control sequences
2179 * @ESapc: ESC _ parsed
2180 * @ESpm: ESC ^ parsed
2181 * @ESdcs: ESC P parsed
2182 * @ESANSI_last: last state for ignoring ansi control sequences
2183 */
2184enum vc_ctl_state {
2185 ESnormal,
2186 ESesc,
2187 ESsquare,
2188 ESgetpars,
2189 ESfunckey,
2190 EShash,
2191 ESsetG0,
2192 ESsetG1,
2193 ESpercent,
2194 EScsiignore,
2195 ESnonstd,
2196 ESpalette,
2197 ESosc,
2198 ESANSI_first = ESosc,
2199 ESapc,
2200 ESpm,
2201 ESdcs,
2202 ESANSI_last = ESdcs,
2203};
2204
2205/* console_lock is held (except via vc_init()) */
2206static void reset_terminal(struct vc_data *vc, int do_clear)
2207{
2208 unsigned int i;
2209
2210 vc->vc_top = 0;
2211 vc->vc_bottom = vc->vc_rows;
2212 vc->vc_state = ESnormal;
2213 vc->vc_priv = EPecma;
2214 vc->vc_translate = set_translate(m: LAT1_MAP, vc);
2215 vc->state.Gx_charset[0] = LAT1_MAP;
2216 vc->state.Gx_charset[1] = GRAF_MAP;
2217 vc->state.charset = 0;
2218 vc->vc_need_wrap = 0;
2219 vc->vc_report_mouse = 0;
2220 vc->vc_bracketed_paste = 0;
2221 vc->vc_utf = default_utf8;
2222 vc->vc_utf_count = 0;
2223
2224 vc->vc_disp_ctrl = 0;
2225 vc->vc_toggle_meta = 0;
2226
2227 vc->vc_decscnm = 0;
2228 vc->vc_decom = 0;
2229 vc->vc_decawm = 1;
2230 vc->vc_deccm = global_cursor_default;
2231 vc->vc_decim = 0;
2232
2233 if (vc->vc_saved_screen != NULL) {
2234 kfree(objp: vc->vc_saved_screen);
2235 vc->vc_saved_screen = NULL;
2236 vc->vc_saved_rows = 0;
2237 vc->vc_saved_cols = 0;
2238 }
2239
2240 vt_reset_keyboard(console: vc->vc_num);
2241
2242 vc->vc_cursor_type = cur_default;
2243 vc->vc_complement_mask = vc->vc_s_complement_mask;
2244
2245 default_attr(vc);
2246 update_attr(vc);
2247
2248 bitmap_zero(dst: vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2249 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2250 set_bit(nr: i, addr: vc->vc_tab_stop);
2251
2252 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2253 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2254 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2255
2256 gotoxy(vc, new_x: 0, new_y: 0);
2257 save_cur(vc);
2258 if (do_clear)
2259 csi_J(vc, vpar: CSI_J_VISIBLE);
2260}
2261
2262static void vc_setGx(struct vc_data *vc, unsigned int which, u8 c)
2263{
2264 unsigned char *charset = &vc->state.Gx_charset[which];
2265
2266 switch (c) {
2267 case '0':
2268 *charset = GRAF_MAP;
2269 break;
2270 case 'B':
2271 *charset = LAT1_MAP;
2272 break;
2273 case 'U':
2274 *charset = IBMPC_MAP;
2275 break;
2276 case 'K':
2277 *charset = USER_MAP;
2278 break;
2279 }
2280
2281 if (vc->state.charset == which)
2282 vc->vc_translate = set_translate(m: *charset, vc);
2283}
2284
2285static bool ansi_control_string(enum vc_ctl_state state)
2286{
2287 return state >= ESANSI_first && state <= ESANSI_last;
2288}
2289
2290enum {
2291 ASCII_NULL = 0,
2292 ASCII_BELL = 7,
2293 ASCII_BACKSPACE = 8,
2294 ASCII_IGNORE_FIRST = ASCII_BACKSPACE,
2295 ASCII_HTAB = 9,
2296 ASCII_LINEFEED = 10,
2297 ASCII_VTAB = 11,
2298 ASCII_FORMFEED = 12,
2299 ASCII_CAR_RET = 13,
2300 ASCII_IGNORE_LAST = ASCII_CAR_RET,
2301 ASCII_SHIFTOUT = 14,
2302 ASCII_SHIFTIN = 15,
2303 ASCII_CANCEL = 24,
2304 ASCII_SUBSTITUTE = 26,
2305 ASCII_ESCAPE = 27,
2306 ASCII_CSI_IGNORE_FIRST = ' ', /* 0x2x, 0x3a and 0x3c - 0x3f */
2307 ASCII_CSI_IGNORE_LAST = '?',
2308 ASCII_DEL = 127,
2309 ASCII_EXT_CSI = 128 + ASCII_ESCAPE,
2310};
2311
2312/*
2313 * Handle ascii characters in control sequences and change states accordingly.
2314 * E.g. ESC sets the state of vc to ESesc.
2315 *
2316 * Returns: true if @c handled.
2317 */
2318static bool handle_ascii(struct tty_struct *tty, struct vc_data *vc, u8 c)
2319{
2320 switch (c) {
2321 case ASCII_NULL:
2322 return true;
2323 case ASCII_BELL:
2324 if (ansi_control_string(state: vc->vc_state))
2325 vc->vc_state = ESnormal;
2326 else if (vc->vc_bell_duration)
2327 kd_mksound(hz: vc->vc_bell_pitch, ticks: vc->vc_bell_duration);
2328 return true;
2329 case ASCII_BACKSPACE:
2330 bs(vc);
2331 return true;
2332 case ASCII_HTAB:
2333 vc->vc_pos -= (vc->state.x << 1);
2334
2335 vc->state.x = find_next_bit(addr: vc->vc_tab_stop,
2336 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2337 offset: vc->state.x + 1);
2338 if (vc->state.x >= VC_TABSTOPS_COUNT)
2339 vc->state.x = vc->vc_cols - 1;
2340
2341 vc->vc_pos += (vc->state.x << 1);
2342 notify_write(vc, unicode: '\t');
2343 return true;
2344 case ASCII_LINEFEED:
2345 case ASCII_VTAB:
2346 case ASCII_FORMFEED:
2347 lf(vc);
2348 if (!is_kbd(vc, lnm))
2349 return true;
2350 fallthrough;
2351 case ASCII_CAR_RET:
2352 cr(vc);
2353 return true;
2354 case ASCII_SHIFTOUT:
2355 vc->state.charset = 1;
2356 vc->vc_translate = set_translate(m: vc->state.Gx_charset[1], vc);
2357 vc->vc_disp_ctrl = 1;
2358 return true;
2359 case ASCII_SHIFTIN:
2360 vc->state.charset = 0;
2361 vc->vc_translate = set_translate(m: vc->state.Gx_charset[0], vc);
2362 vc->vc_disp_ctrl = 0;
2363 return true;
2364 case ASCII_CANCEL:
2365 case ASCII_SUBSTITUTE:
2366 vc->vc_state = ESnormal;
2367 return true;
2368 case ASCII_ESCAPE:
2369 vc->vc_state = ESesc;
2370 return true;
2371 case ASCII_DEL:
2372 del(vc);
2373 return true;
2374 case ASCII_EXT_CSI:
2375 vc->vc_state = ESsquare;
2376 return true;
2377 }
2378
2379 return false;
2380}
2381
2382/*
2383 * Handle a character (@c) following an ESC (when @vc is in the ESesc state).
2384 * E.g. previous ESC with @c == '[' here yields the ESsquare state (that is:
2385 * CSI).
2386 */
2387static void handle_esc(struct tty_struct *tty, struct vc_data *vc, u8 c)
2388{
2389 vc->vc_state = ESnormal;
2390 switch (c) {
2391 case '[':
2392 vc->vc_state = ESsquare;
2393 break;
2394 case ']':
2395 vc->vc_state = ESnonstd;
2396 break;
2397 case '_':
2398 vc->vc_state = ESapc;
2399 break;
2400 case '^':
2401 vc->vc_state = ESpm;
2402 break;
2403 case '%':
2404 vc->vc_state = ESpercent;
2405 break;
2406 case 'E':
2407 cr(vc);
2408 lf(vc);
2409 break;
2410 case 'M':
2411 ri(vc);
2412 break;
2413 case 'D':
2414 lf(vc);
2415 break;
2416 case 'H':
2417 if (vc->state.x < VC_TABSTOPS_COUNT)
2418 set_bit(nr: vc->state.x, addr: vc->vc_tab_stop);
2419 break;
2420 case 'P':
2421 vc->vc_state = ESdcs;
2422 break;
2423 case 'Z':
2424 respond_ID(tty);
2425 break;
2426 case '7':
2427 save_cur(vc);
2428 break;
2429 case '8':
2430 restore_cur(vc);
2431 break;
2432 case '(':
2433 vc->vc_state = ESsetG0;
2434 break;
2435 case ')':
2436 vc->vc_state = ESsetG1;
2437 break;
2438 case '#':
2439 vc->vc_state = EShash;
2440 break;
2441 case 'c':
2442 reset_terminal(vc, do_clear: 1);
2443 break;
2444 case '>': /* Numeric keypad */
2445 clr_kbd(vc, kbdapplic);
2446 break;
2447 case '=': /* Appl. keypad */
2448 set_kbd(vc, kbdapplic);
2449 break;
2450 }
2451}
2452
2453/*
2454 * Handle special DEC control sequences ("ESC [ ? parameters char"). Parameters
2455 * are in @vc->vc_par and the char is in @c here.
2456 */
2457static void csi_DEC(struct tty_struct *tty, struct vc_data *vc, u8 c)
2458{
2459 switch (c) {
2460 case 'h':
2461 csi_DEC_hl(vc, on_off: true);
2462 break;
2463 case 'l':
2464 csi_DEC_hl(vc, on_off: false);
2465 break;
2466 case 'c':
2467 if (vc->vc_par[0])
2468 vc->vc_cursor_type = CUR_MAKE(vc->vc_par[0],
2469 vc->vc_par[1],
2470 vc->vc_par[2]);
2471 else
2472 vc->vc_cursor_type = cur_default;
2473 break;
2474 case 'm':
2475 clear_selection();
2476 if (vc->vc_par[0])
2477 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2478 else
2479 vc->vc_complement_mask = vc->vc_s_complement_mask;
2480 break;
2481 case 'n':
2482 if (vc->vc_par[0] == 5)
2483 status_report(tty);
2484 else if (vc->vc_par[0] == 6)
2485 cursor_report(vc, tty);
2486 break;
2487 }
2488}
2489
2490/*
2491 * Handle Control Sequence Introducer control characters. That is
2492 * "ESC [ parameters char". Parameters are in @vc->vc_par and the char is in
2493 * @c here.
2494 */
2495static void csi_ECMA(struct tty_struct *tty, struct vc_data *vc, u8 c)
2496{
2497 switch (c) {
2498 case 'G':
2499 case '`':
2500 if (vc->vc_par[0])
2501 vc->vc_par[0]--;
2502 gotoxy(vc, new_x: vc->vc_par[0], new_y: vc->state.y);
2503 break;
2504 case 'A':
2505 if (!vc->vc_par[0])
2506 vc->vc_par[0]++;
2507 gotoxy(vc, new_x: vc->state.x, new_y: vc->state.y - vc->vc_par[0]);
2508 break;
2509 case 'B':
2510 case 'e':
2511 if (!vc->vc_par[0])
2512 vc->vc_par[0]++;
2513 gotoxy(vc, new_x: vc->state.x, new_y: vc->state.y + vc->vc_par[0]);
2514 break;
2515 case 'C':
2516 case 'a':
2517 if (!vc->vc_par[0])
2518 vc->vc_par[0]++;
2519 gotoxy(vc, new_x: vc->state.x + vc->vc_par[0], new_y: vc->state.y);
2520 break;
2521 case 'D':
2522 if (!vc->vc_par[0])
2523 vc->vc_par[0]++;
2524 gotoxy(vc, new_x: vc->state.x - vc->vc_par[0], new_y: vc->state.y);
2525 break;
2526 case 'E':
2527 if (!vc->vc_par[0])
2528 vc->vc_par[0]++;
2529 gotoxy(vc, new_x: 0, new_y: vc->state.y + vc->vc_par[0]);
2530 break;
2531 case 'F':
2532 if (!vc->vc_par[0])
2533 vc->vc_par[0]++;
2534 gotoxy(vc, new_x: 0, new_y: vc->state.y - vc->vc_par[0]);
2535 break;
2536 case 'd':
2537 if (vc->vc_par[0])
2538 vc->vc_par[0]--;
2539 gotoxay(vc, new_x: vc->state.x ,new_y: vc->vc_par[0]);
2540 break;
2541 case 'H':
2542 case 'f':
2543 if (vc->vc_par[0])
2544 vc->vc_par[0]--;
2545 if (vc->vc_par[1])
2546 vc->vc_par[1]--;
2547 gotoxay(vc, new_x: vc->vc_par[1], new_y: vc->vc_par[0]);
2548 break;
2549 case 'J':
2550 csi_J(vc, vpar: vc->vc_par[0]);
2551 break;
2552 case 'K':
2553 csi_K(vc);
2554 break;
2555 case 'L':
2556 csi_L(vc);
2557 break;
2558 case 'M':
2559 csi_M(vc);
2560 break;
2561 case 'P':
2562 csi_P(vc);
2563 break;
2564 case 'c':
2565 if (!vc->vc_par[0])
2566 respond_ID(tty);
2567 break;
2568 case 'g':
2569 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2570 set_bit(nr: vc->state.x, addr: vc->vc_tab_stop);
2571 else if (vc->vc_par[0] == 3)
2572 bitmap_zero(dst: vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2573 break;
2574 case 'h':
2575 csi_hl(vc, on_off: true);
2576 break;
2577 case 'l':
2578 csi_hl(vc, on_off: false);
2579 break;
2580 case 'm':
2581 csi_m(vc);
2582 break;
2583 case 'n':
2584 if (vc->vc_par[0] == 5)
2585 status_report(tty);
2586 else if (vc->vc_par[0] == 6)
2587 cursor_report(vc, tty);
2588 break;
2589 case 'q': /* DECLL - but only 3 leds */
2590 /* map 0,1,2,3 to 0,1,2,4 */
2591 if (vc->vc_par[0] < 4)
2592 vt_set_led_state(console: vc->vc_num,
2593 leds: (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2594 break;
2595 case 'r':
2596 if (!vc->vc_par[0])
2597 vc->vc_par[0]++;
2598 if (!vc->vc_par[1])
2599 vc->vc_par[1] = vc->vc_rows;
2600 /* Minimum allowed region is 2 lines */
2601 if (vc->vc_par[0] < vc->vc_par[1] &&
2602 vc->vc_par[1] <= vc->vc_rows) {
2603 vc->vc_top = vc->vc_par[0] - 1;
2604 vc->vc_bottom = vc->vc_par[1];
2605 gotoxay(vc, new_x: 0, new_y: 0);
2606 }
2607 break;
2608 case 's':
2609 save_cur(vc);
2610 break;
2611 case 'u':
2612 restore_cur(vc);
2613 break;
2614 case 'X':
2615 csi_X(vc);
2616 break;
2617 case '@':
2618 csi_at(vc, nr: vc->vc_par[0]);
2619 break;
2620 case ']':
2621 csi_RSB(vc);
2622 break;
2623 }
2624
2625}
2626
2627static void vc_reset_params(struct vc_data *vc)
2628{
2629 memset(s: vc->vc_par, c: 0, n: sizeof(vc->vc_par));
2630 vc->vc_npar = 0;
2631}
2632
2633/* console_lock is held */
2634static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
2635{
2636 /*
2637 * Control characters can be used in the _middle_
2638 * of an escape sequence, aside from ANSI control strings.
2639 */
2640 if (ansi_control_string(state: vc->vc_state) && c >= ASCII_IGNORE_FIRST &&
2641 c <= ASCII_IGNORE_LAST)
2642 return;
2643
2644 if (handle_ascii(tty, vc, c))
2645 return;
2646
2647 switch(vc->vc_state) {
2648 case ESesc: /* ESC */
2649 handle_esc(tty, vc, c);
2650 return;
2651 case ESnonstd: /* ESC ] aka OSC */
2652 switch (c) {
2653 case 'P': /* palette escape sequence */
2654 vc_reset_params(vc);
2655 vc->vc_state = ESpalette;
2656 return;
2657 case 'R': /* reset palette */
2658 reset_palette(vc);
2659 break;
2660 case '0' ... '9':
2661 vc->vc_state = ESosc;
2662 return;
2663 }
2664 vc->vc_state = ESnormal;
2665 return;
2666 case ESpalette: /* ESC ] P aka OSC P */
2667 if (isxdigit(c)) {
2668 vc->vc_par[vc->vc_npar++] = hex_to_bin(ch: c);
2669 if (vc->vc_npar == 7) {
2670 int i = vc->vc_par[0] * 3, j = 1;
2671 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2672 vc->vc_palette[i++] += vc->vc_par[j++];
2673 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2674 vc->vc_palette[i++] += vc->vc_par[j++];
2675 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2676 vc->vc_palette[i] += vc->vc_par[j];
2677 set_palette(vc);
2678 vc->vc_state = ESnormal;
2679 }
2680 } else
2681 vc->vc_state = ESnormal;
2682 return;
2683 case ESsquare: /* ESC [ aka CSI, parameters or modifiers expected */
2684 vc_reset_params(vc);
2685
2686 vc->vc_state = ESgetpars;
2687 switch (c) {
2688 case '[': /* Function key */
2689 vc->vc_state = ESfunckey;
2690 return;
2691 case '?':
2692 vc->vc_priv = EPdec;
2693 return;
2694 case '>':
2695 vc->vc_priv = EPgt;
2696 return;
2697 case '=':
2698 vc->vc_priv = EPeq;
2699 return;
2700 case '<':
2701 vc->vc_priv = EPlt;
2702 return;
2703 }
2704 vc->vc_priv = EPecma;
2705 fallthrough;
2706 case ESgetpars: /* ESC [ aka CSI, parameters expected */
2707 switch (c) {
2708 case ';':
2709 if (vc->vc_npar < NPAR - 1) {
2710 vc->vc_npar++;
2711 return;
2712 }
2713 break;
2714 case '0' ... '9':
2715 vc->vc_par[vc->vc_npar] *= 10;
2716 vc->vc_par[vc->vc_npar] += c - '0';
2717 return;
2718 }
2719 if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST) {
2720 vc->vc_state = EScsiignore;
2721 return;
2722 }
2723
2724 /* parameters done, handle the control char @c */
2725
2726 vc->vc_state = ESnormal;
2727
2728 switch (vc->vc_priv) {
2729 case EPdec:
2730 csi_DEC(tty, vc, c);
2731 return;
2732 case EPecma:
2733 csi_ECMA(tty, vc, c);
2734 return;
2735 default:
2736 return;
2737 }
2738 case EScsiignore:
2739 if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST)
2740 return;
2741 vc->vc_state = ESnormal;
2742 return;
2743 case ESpercent: /* ESC % */
2744 vc->vc_state = ESnormal;
2745 switch (c) {
2746 case '@': /* defined in ISO 2022 */
2747 vc->vc_utf = 0;
2748 return;
2749 case 'G': /* prelim official escape code */
2750 case '8': /* retained for compatibility */
2751 vc->vc_utf = 1;
2752 return;
2753 }
2754 return;
2755 case ESfunckey: /* ESC [ [ aka CSI [ */
2756 vc->vc_state = ESnormal;
2757 return;
2758 case EShash: /* ESC # */
2759 vc->vc_state = ESnormal;
2760 if (c == '8') {
2761 /* DEC screen alignment test. kludge :-) */
2762 vc->vc_video_erase_char =
2763 (vc->vc_video_erase_char & 0xff00) | 'E';
2764 csi_J(vc, vpar: CSI_J_VISIBLE);
2765 vc->vc_video_erase_char =
2766 (vc->vc_video_erase_char & 0xff00) | ' ';
2767 do_update_region(vc, start: vc->vc_origin, count: vc->vc_screenbuf_size / 2);
2768 }
2769 return;
2770 case ESsetG0: /* ESC ( */
2771 vc_setGx(vc, which: 0, c);
2772 vc->vc_state = ESnormal;
2773 return;
2774 case ESsetG1: /* ESC ) */
2775 vc_setGx(vc, which: 1, c);
2776 vc->vc_state = ESnormal;
2777 return;
2778 case ESapc: /* ESC _ */
2779 return;
2780 case ESosc: /* ESC ] [0-9] aka OSC [0-9] */
2781 return;
2782 case ESpm: /* ESC ^ */
2783 return;
2784 case ESdcs: /* ESC P */
2785 return;
2786 default:
2787 vc->vc_state = ESnormal;
2788 }
2789}
2790
2791struct vc_draw_region {
2792 unsigned long from, to;
2793 int x;
2794};
2795
2796static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2797{
2798 if (draw->x < 0)
2799 return;
2800
2801 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2802 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2803 draw->x);
2804 draw->x = -1;
2805}
2806
2807static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2808{
2809 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2810 if (vc->vc_toggle_meta)
2811 c |= 0x80;
2812
2813 return vc->vc_translate[c];
2814 }
2815
2816 return c;
2817}
2818
2819
2820/**
2821 * vc_sanitize_unicode - Replace invalid Unicode code points with ``U+FFFD``
2822 * @c: the received code point
2823 */
2824static inline int vc_sanitize_unicode(const int c)
2825{
2826 if (c >= 0xd800 && c <= 0xdfff)
2827 return 0xfffd;
2828
2829 return c;
2830}
2831
2832/**
2833 * vc_translate_unicode - Combine UTF-8 into Unicode in &vc_data.vc_utf_char
2834 * @vc: virtual console
2835 * @c: UTF-8 byte to translate
2836 * @rescan: set to true iff @c wasn't consumed here and needs to be re-processed
2837 *
2838 * * &vc_data.vc_utf_char is the being-constructed Unicode code point.
2839 * * &vc_data.vc_utf_count is the number of continuation bytes still expected to
2840 * arrive.
2841 * * &vc_data.vc_npar is the number of continuation bytes arrived so far.
2842 *
2843 * Return:
2844 * * %-1 - Input OK so far, @c consumed, further bytes expected.
2845 * * %0xFFFD - Possibility 1: input invalid, @c may have been consumed (see
2846 * desc. of @rescan). Possibility 2: input OK, @c consumed,
2847 * ``U+FFFD`` is the resulting code point. ``U+FFFD`` is valid,
2848 * ``REPLACEMENT CHARACTER``.
2849 * * otherwise - Input OK, @c consumed, resulting code point returned.
2850 */
2851static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2852{
2853 static const u32 utf8_length_changes[] = {0x7f, 0x7ff, 0xffff, 0x10ffff};
2854
2855 /* Continuation byte received */
2856 if ((c & 0xc0) == 0x80) {
2857 /* Unexpected continuation byte? */
2858 if (!vc->vc_utf_count)
2859 goto bad_sequence;
2860
2861 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2862 vc->vc_npar++;
2863 if (--vc->vc_utf_count)
2864 goto need_more_bytes;
2865
2866 /* Got a whole character */
2867 c = vc->vc_utf_char;
2868 /* Reject overlong sequences */
2869 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2870 c > utf8_length_changes[vc->vc_npar])
2871 goto bad_sequence;
2872
2873 return vc_sanitize_unicode(c);
2874 }
2875
2876 /* Single ASCII byte or first byte of a sequence received */
2877 if (vc->vc_utf_count) {
2878 /* A continuation byte was expected */
2879 *rescan = true;
2880 vc->vc_utf_count = 0;
2881 goto bad_sequence;
2882 }
2883
2884 /* Nothing to do if an ASCII byte was received */
2885 if (c <= 0x7f)
2886 return c;
2887
2888 /* First byte of a multibyte sequence received */
2889 vc->vc_npar = 0;
2890 if ((c & 0xe0) == 0xc0) {
2891 vc->vc_utf_count = 1;
2892 vc->vc_utf_char = (c & 0x1f);
2893 } else if ((c & 0xf0) == 0xe0) {
2894 vc->vc_utf_count = 2;
2895 vc->vc_utf_char = (c & 0x0f);
2896 } else if ((c & 0xf8) == 0xf0) {
2897 vc->vc_utf_count = 3;
2898 vc->vc_utf_char = (c & 0x07);
2899 } else {
2900 goto bad_sequence;
2901 }
2902
2903need_more_bytes:
2904 return -1;
2905
2906bad_sequence:
2907 return 0xfffd;
2908}
2909
2910static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2911{
2912 /* Do no translation at all in control states */
2913 if (vc->vc_state != ESnormal)
2914 return *c;
2915
2916 if (vc->vc_utf && !vc->vc_disp_ctrl)
2917 return *c = vc_translate_unicode(vc, c: *c, rescan);
2918
2919 /* no utf or alternate charset mode */
2920 return vc_translate_ascii(vc, c: *c);
2921}
2922
2923static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2924{
2925 if (!vc->vc_can_do_color)
2926 return vc->vc_attr ^ 0x08;
2927
2928 if (vc->vc_hi_font_mask == 0x100)
2929 return (vc->vc_attr & 0x11) |
2930 ((vc->vc_attr & 0xe0) >> 4) |
2931 ((vc->vc_attr & 0x0e) << 4);
2932
2933 return (vc->vc_attr & 0x88) |
2934 ((vc->vc_attr & 0x70) >> 4) |
2935 ((vc->vc_attr & 0x07) << 4);
2936}
2937
2938static bool vc_is_control(struct vc_data *vc, int tc, int c)
2939{
2940 /*
2941 * A bitmap for codes <32. A bit of 1 indicates that the code
2942 * corresponding to that bit number invokes some special action (such
2943 * as cursor movement) and should not be displayed as a glyph unless
2944 * the disp_ctrl mode is explicitly enabled.
2945 */
2946 static const u32 CTRL_ACTION = BIT(ASCII_NULL) |
2947 GENMASK(ASCII_SHIFTIN, ASCII_BELL) | BIT(ASCII_CANCEL) |
2948 BIT(ASCII_SUBSTITUTE) | BIT(ASCII_ESCAPE);
2949 /* Cannot be overridden by disp_ctrl */
2950 static const u32 CTRL_ALWAYS = BIT(ASCII_NULL) | BIT(ASCII_BACKSPACE) |
2951 BIT(ASCII_LINEFEED) | BIT(ASCII_SHIFTIN) | BIT(ASCII_SHIFTOUT) |
2952 BIT(ASCII_CAR_RET) | BIT(ASCII_FORMFEED) | BIT(ASCII_ESCAPE);
2953
2954 if (vc->vc_state != ESnormal)
2955 return true;
2956
2957 if (!tc)
2958 return true;
2959
2960 /*
2961 * If the original code was a control character we only allow a glyph
2962 * to be displayed if the code is not normally used (such as for cursor
2963 * movement) or if the disp_ctrl mode has been explicitly enabled.
2964 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2965 * displayed as control characters, as the console would be pretty
2966 * useless without them; to display an arbitrary font position use the
2967 * direct-to-font zone in UTF-8 mode.
2968 */
2969 if (c < BITS_PER_TYPE(CTRL_ALWAYS)) {
2970 if (vc->vc_disp_ctrl)
2971 return CTRL_ALWAYS & BIT(c);
2972 else
2973 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2974 }
2975
2976 if (c == ASCII_DEL && !vc->vc_disp_ctrl)
2977 return true;
2978
2979 if (c == ASCII_EXT_CSI)
2980 return true;
2981
2982 return false;
2983}
2984
2985static void vc_con_rewind(struct vc_data *vc)
2986{
2987 if (vc->state.x && !vc->vc_need_wrap) {
2988 vc->vc_pos -= 2;
2989 vc->state.x--;
2990 }
2991 vc->vc_need_wrap = 0;
2992}
2993
2994#define UCS_ZWS 0x200b /* Zero Width Space */
2995#define UCS_VS16 0xfe0f /* Variation Selector 16 */
2996#define UCS_REPLACEMENT 0xfffd /* Replacement Character */
2997
2998static int vc_process_ucs(struct vc_data *vc, int *c, int *tc)
2999{
3000 u32 prev_c, curr_c = *c;
3001
3002 if (ucs_is_double_width(cp: curr_c)) {
3003 /*
3004 * The Unicode screen memory is allocated only when
3005 * required. This is one such case as we need to remember
3006 * which displayed characters are double-width.
3007 */
3008 vc_uniscr_check(vc);
3009 return 2;
3010 }
3011
3012 if (!ucs_is_zero_width(cp: curr_c))
3013 return 1;
3014
3015 /* From here curr_c is known to be zero-width. */
3016
3017 if (ucs_is_double_width(cp: vc_uniscr_getc(vc, relative_pos: -2))) {
3018 /*
3019 * Let's merge this zero-width code point with the preceding
3020 * double-width code point by replacing the existing
3021 * zero-width space padding. To do so we rewind one column
3022 * and pretend this has a width of 1.
3023 * We give the legacy display the same initial space padding.
3024 */
3025 vc_con_rewind(vc);
3026 *tc = ' ';
3027 return 1;
3028 }
3029
3030 /* From here the preceding character, if any, must be single-width. */
3031 prev_c = vc_uniscr_getc(vc, relative_pos: -1);
3032
3033 if (curr_c == UCS_VS16 && prev_c != 0) {
3034 /*
3035 * VS16 (U+FE0F) is special. It typically turns the preceding
3036 * single-width character into a double-width one. Let it
3037 * have a width of 1 effectively making the combination with
3038 * the preceding character double-width.
3039 */
3040 *tc = ' ';
3041 return 1;
3042 }
3043
3044 /* try recomposition */
3045 prev_c = ucs_recompose(base: prev_c, mark: curr_c);
3046 if (prev_c != 0) {
3047 vc_con_rewind(vc);
3048 *tc = *c = prev_c;
3049 return 1;
3050 }
3051
3052 /* Otherwise zero-width code points are ignored. */
3053 return 0;
3054}
3055
3056static int vc_get_glyph(struct vc_data *vc, int tc)
3057{
3058 int glyph = conv_uni_to_pc(conp: vc, ucs: tc);
3059 u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
3060
3061 if (!(glyph & ~charmask))
3062 return glyph;
3063
3064 if (glyph == -1)
3065 return -1; /* nothing to display */
3066
3067 /* Glyph not found */
3068 if ((!vc->vc_utf || vc->vc_disp_ctrl || tc < 128) && !(tc & ~charmask)) {
3069 /*
3070 * In legacy mode use the glyph we get by a 1:1 mapping.
3071 * This would make absolutely no sense with Unicode in mind, but do this for
3072 * ASCII characters since a font may lack Unicode mapping info and we don't
3073 * want to end up with having question marks only.
3074 */
3075 return tc;
3076 }
3077
3078 /*
3079 * The Unicode screen memory is allocated only when required.
3080 * This is one such case: we're about to "cheat" with the displayed
3081 * character meaning the simple screen buffer won't hold the original
3082 * information, whereas the Unicode screen buffer always does.
3083 */
3084 vc_uniscr_check(vc);
3085
3086 /* Try getting a simpler fallback character. */
3087 tc = ucs_get_fallback(cp: tc);
3088 if (tc)
3089 return vc_get_glyph(vc, tc);
3090
3091 /* Display U+FFFD (Unicode Replacement Character). */
3092 return conv_uni_to_pc(conp: vc, UCS_REPLACEMENT);
3093}
3094
3095static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
3096 struct vc_draw_region *draw)
3097{
3098 int next_c;
3099 unsigned char vc_attr = vc->vc_attr;
3100 u16 himask = vc->vc_hi_font_mask;
3101 u8 width = 1;
3102 bool inverse = false;
3103
3104 if (vc->vc_utf && !vc->vc_disp_ctrl) {
3105 width = vc_process_ucs(vc, c: &c, tc: &tc);
3106 if (!width)
3107 goto out;
3108 }
3109
3110 /* Now try to find out how to display it */
3111 tc = vc_get_glyph(vc, tc);
3112 if (tc == -1)
3113 return -1; /* nothing to display */
3114 if (tc < 0) {
3115 inverse = true;
3116 tc = conv_uni_to_pc(conp: vc, ucs: '?');
3117 if (tc < 0)
3118 tc = '?';
3119
3120 vc_attr = vc_invert_attr(vc);
3121 con_flush(vc, draw);
3122 }
3123
3124 next_c = c;
3125 while (1) {
3126 if (vc->vc_need_wrap || vc->vc_decim)
3127 con_flush(vc, draw);
3128 if (vc->vc_need_wrap) {
3129 cr(vc);
3130 lf(vc);
3131 }
3132 if (vc->vc_decim)
3133 insert_char(vc, nr: 1);
3134 vc_uniscr_putc(vc, uc: next_c);
3135
3136 if (himask)
3137 tc = ((tc & 0x100) ? himask : 0) |
3138 (tc & 0xff);
3139 tc |= (vc_attr << 8) & ~himask;
3140
3141 scr_writew(tc, (u16 *)vc->vc_pos);
3142
3143 if (con_should_update(vc) && draw->x < 0) {
3144 draw->x = vc->state.x;
3145 draw->from = vc->vc_pos;
3146 }
3147 if (vc->state.x == vc->vc_cols - 1) {
3148 vc->vc_need_wrap = vc->vc_decawm;
3149 draw->to = vc->vc_pos + 2;
3150 } else {
3151 vc->state.x++;
3152 draw->to = (vc->vc_pos += 2);
3153 }
3154
3155 if (!--width)
3156 break;
3157
3158 /* A space is printed in the second column */
3159 tc = conv_uni_to_pc(conp: vc, ucs: ' ');
3160 if (tc < 0)
3161 tc = ' ';
3162 /*
3163 * Store a zero-width space in the Unicode screen given that
3164 * the previous code point is semantically double width.
3165 */
3166 next_c = UCS_ZWS;
3167 }
3168
3169out:
3170 notify_write(vc, unicode: c);
3171
3172 if (inverse)
3173 con_flush(vc, draw);
3174
3175 return 0;
3176}
3177
3178/* acquires console_lock */
3179static int do_con_write(struct tty_struct *tty, const u8 *buf, int count)
3180{
3181 struct vc_draw_region draw = {
3182 .x = -1,
3183 };
3184 int c, tc, n = 0;
3185 unsigned int currcons;
3186 struct vc_data *vc = tty->driver_data;
3187 struct vt_notifier_param param;
3188 bool rescan;
3189
3190 if (in_interrupt())
3191 return count;
3192
3193 guard(console_lock)();
3194 currcons = vc->vc_num;
3195 if (!vc_cons_allocated(i: currcons)) {
3196 /* could this happen? */
3197 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
3198 return 0;
3199 }
3200
3201
3202 /* undraw cursor first */
3203 if (con_is_fg(vc))
3204 hide_cursor(vc);
3205
3206 param.vc = vc;
3207
3208 while (!tty->flow.stopped && count) {
3209 u8 orig = *buf;
3210 buf++;
3211 n++;
3212 count--;
3213rescan_last_byte:
3214 c = orig;
3215 rescan = false;
3216
3217 tc = vc_translate(vc, c: &c, rescan: &rescan);
3218 if (tc == -1)
3219 continue;
3220
3221 param.c = tc;
3222 if (atomic_notifier_call_chain(nh: &vt_notifier_list, VT_PREWRITE,
3223 v: &param) == NOTIFY_STOP)
3224 continue;
3225
3226 if (vc_is_control(vc, tc, c)) {
3227 con_flush(vc, draw: &draw);
3228 do_con_trol(tty, vc, c: orig);
3229 continue;
3230 }
3231
3232 if (vc_con_write_normal(vc, tc, c, draw: &draw) < 0)
3233 continue;
3234
3235 if (rescan)
3236 goto rescan_last_byte;
3237 }
3238 con_flush(vc, draw: &draw);
3239 console_conditional_schedule();
3240 notify_update(vc);
3241
3242 return n;
3243}
3244
3245/*
3246 * This is the console switching callback.
3247 *
3248 * Doing console switching in a process context allows
3249 * us to do the switches asynchronously (needed when we want
3250 * to switch due to a keyboard interrupt). Synchronization
3251 * with other console code and prevention of re-entrancy is
3252 * ensured with console_lock.
3253 */
3254static void console_callback(struct work_struct *ignored)
3255{
3256 guard(console_lock)();
3257
3258 if (want_console >= 0) {
3259 if (want_console != fg_console &&
3260 vc_cons_allocated(i: want_console)) {
3261 hide_cursor(vc: vc_cons[fg_console].d);
3262 change_console(new_vc: vc_cons[want_console].d);
3263 /* we only changed when the console had already
3264 been allocated - a new console is not created
3265 in an interrupt routine */
3266 }
3267 want_console = -1;
3268 }
3269 if (do_poke_blanked_console) { /* do not unblank for a LED change */
3270 do_poke_blanked_console = 0;
3271 poke_blanked_console();
3272 }
3273 if (scrollback_delta) {
3274 struct vc_data *vc = vc_cons[fg_console].d;
3275 clear_selection();
3276 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
3277 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
3278 scrollback_delta = 0;
3279 }
3280 if (blank_timer_expired) {
3281 do_blank_screen(entering_gfx: 0);
3282 blank_timer_expired = 0;
3283 }
3284 notify_update(vc: vc_cons[fg_console].d);
3285}
3286
3287int set_console(int nr)
3288{
3289 struct vc_data *vc = vc_cons[fg_console].d;
3290
3291 if (!vc_cons_allocated(i: nr) || vt_dont_switch ||
3292 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
3293
3294 /*
3295 * Console switch will fail in console_callback() or
3296 * change_console() so there is no point scheduling
3297 * the callback
3298 *
3299 * Existing set_console() users don't check the return
3300 * value so this shouldn't break anything
3301 */
3302 return -EINVAL;
3303 }
3304
3305 want_console = nr;
3306 schedule_console_callback();
3307
3308 return 0;
3309}
3310
3311struct tty_driver *console_driver;
3312
3313#ifdef CONFIG_VT_CONSOLE
3314
3315/**
3316 * vt_kmsg_redirect() - sets/gets the kernel message console
3317 * @new: the new virtual terminal number or -1 if the console should stay
3318 * unchanged
3319 *
3320 * By default, the kernel messages are always printed on the current virtual
3321 * console. However, the user may modify that default with the
3322 * %TIOCL_SETKMSGREDIRECT ioctl call.
3323 *
3324 * This function sets the kernel message console to be @new. It returns the old
3325 * virtual console number. The virtual terminal number %0 (both as parameter and
3326 * return value) means no redirection (i.e. always printed on the currently
3327 * active console).
3328 *
3329 * The parameter -1 means that only the current console is returned, but the
3330 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3331 * case to make the code more understandable.
3332 *
3333 * When the kernel is compiled without %CONFIG_VT_CONSOLE, this function ignores
3334 * the parameter and always returns %0.
3335 */
3336int vt_kmsg_redirect(int new)
3337{
3338 static int kmsg_con;
3339
3340 if (new != -1)
3341 return xchg(&kmsg_con, new);
3342 else
3343 return kmsg_con;
3344}
3345
3346/*
3347 * Console on virtual terminal
3348 *
3349 * The console must be locked when we get here.
3350 */
3351
3352static void vt_console_print(struct console *co, const char *b, unsigned count)
3353{
3354 struct vc_data *vc = vc_cons[fg_console].d;
3355 unsigned char c;
3356 static DEFINE_SPINLOCK(printing_lock);
3357 const ushort *start;
3358 ushort start_x, cnt;
3359 int kmsg_console;
3360
3361 WARN_CONSOLE_UNLOCKED();
3362
3363 /* this protects against concurrent oops only */
3364 if (!spin_trylock(lock: &printing_lock))
3365 return;
3366
3367 kmsg_console = vt_get_kmsg_redirect();
3368 if (kmsg_console && vc_cons_allocated(i: kmsg_console - 1))
3369 vc = vc_cons[kmsg_console - 1].d;
3370
3371 if (!vc_cons_allocated(i: fg_console)) {
3372 /* impossible */
3373 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3374 goto quit;
3375 }
3376
3377 if (vc->vc_mode != KD_TEXT)
3378 goto quit;
3379
3380 /* undraw cursor first */
3381 if (con_is_fg(vc))
3382 hide_cursor(vc);
3383
3384 start = (ushort *)vc->vc_pos;
3385 start_x = vc->state.x;
3386 cnt = 0;
3387 while (count--) {
3388 c = *b++;
3389 if (c == ASCII_LINEFEED || c == ASCII_CAR_RET ||
3390 c == ASCII_BACKSPACE || vc->vc_need_wrap) {
3391 if (cnt && con_is_visible(vc))
3392 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3393 cnt = 0;
3394 if (c == ASCII_BACKSPACE) {
3395 bs(vc);
3396 start = (ushort *)vc->vc_pos;
3397 start_x = vc->state.x;
3398 continue;
3399 }
3400 if (c != ASCII_CAR_RET)
3401 lf(vc);
3402 cr(vc);
3403 start = (ushort *)vc->vc_pos;
3404 start_x = vc->state.x;
3405 if (c == ASCII_LINEFEED || c == ASCII_CAR_RET)
3406 continue;
3407 }
3408 vc_uniscr_putc(vc, uc: c);
3409 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3410 notify_write(vc, unicode: c);
3411 cnt++;
3412 if (vc->state.x == vc->vc_cols - 1) {
3413 vc->vc_need_wrap = 1;
3414 } else {
3415 vc->vc_pos += 2;
3416 vc->state.x++;
3417 }
3418 }
3419 if (cnt && con_is_visible(vc))
3420 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3421 set_cursor(vc);
3422 notify_update(vc);
3423
3424quit:
3425 spin_unlock(lock: &printing_lock);
3426}
3427
3428static struct tty_driver *vt_console_device(struct console *c, int *index)
3429{
3430 *index = c->index ? c->index-1 : fg_console;
3431 return console_driver;
3432}
3433
3434static int vt_console_setup(struct console *co, char *options)
3435{
3436 return co->index >= MAX_NR_CONSOLES ? -EINVAL : 0;
3437}
3438
3439static struct console vt_console_driver = {
3440 .name = "tty",
3441 .setup = vt_console_setup,
3442 .write = vt_console_print,
3443 .device = vt_console_device,
3444 .unblank = unblank_screen,
3445 .flags = CON_PRINTBUFFER,
3446 .index = -1,
3447};
3448#endif
3449
3450/*
3451 * Handling of Linux-specific VC ioctls
3452 */
3453
3454/*
3455 * Generally a bit racy with respect to console_lock();.
3456 *
3457 * There are some functions which don't need it.
3458 *
3459 * There are some functions which can sleep for arbitrary periods
3460 * (paste_selection) but we don't need the lock there anyway.
3461 *
3462 * set_selection_user has locking, and definitely needs it
3463 */
3464
3465int tioclinux(struct tty_struct *tty, unsigned long arg)
3466{
3467 char type, data;
3468 char __user *p = (char __user *)arg;
3469 void __user *param_aligned32 = (u32 __user *)arg + 1;
3470 void __user *param = (void __user *)arg + 1;
3471 int lines;
3472 int ret;
3473
3474 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3475 return -EPERM;
3476 if (get_user(type, p))
3477 return -EFAULT;
3478 ret = 0;
3479
3480 switch (type) {
3481 case TIOCL_SETSEL:
3482 return set_selection_user(sel: param, tty);
3483 case TIOCL_PASTESEL:
3484 if (!capable(CAP_SYS_ADMIN))
3485 return -EPERM;
3486 return paste_selection(tty);
3487 case TIOCL_UNBLANKSCREEN:
3488 scoped_guard(console_lock)
3489 unblank_screen();
3490 break;
3491 case TIOCL_SELLOADLUT:
3492 if (!capable(CAP_SYS_ADMIN))
3493 return -EPERM;
3494 return sel_loadlut(lut: param_aligned32);
3495 case TIOCL_GETSHIFTSTATE:
3496 /*
3497 * Make it possible to react to Shift+Mousebutton. Note that
3498 * 'shift_state' is an undocumented kernel-internal variable;
3499 * programs not closely related to the kernel should not use
3500 * this.
3501 */
3502 data = vt_get_shift_state();
3503 return put_user(data, p);
3504 case TIOCL_GETMOUSEREPORTING:
3505 scoped_guard(console_lock) /* May be overkill */
3506 data = mouse_reporting();
3507 return put_user(data, p);
3508 case TIOCL_SETVESABLANK:
3509 return set_vesa_blanking(param);
3510 case TIOCL_GETKMSGREDIRECT:
3511 data = vt_get_kmsg_redirect();
3512 return put_user(data, p);
3513 case TIOCL_SETKMSGREDIRECT:
3514 if (!capable(CAP_SYS_ADMIN))
3515 return -EPERM;
3516
3517 if (get_user(data, p+1))
3518 return -EFAULT;
3519
3520 vt_kmsg_redirect(new: data);
3521
3522 break;
3523 case TIOCL_GETFGCONSOLE:
3524 /*
3525 * No locking needed as this is a transiently correct return
3526 * anyway if the caller hasn't disabled switching.
3527 */
3528 return fg_console;
3529 case TIOCL_SCROLLCONSOLE:
3530 if (get_user(lines, (s32 __user *)param_aligned32))
3531 return -EFAULT;
3532
3533 /*
3534 * Needs the console lock here. Note that lots of other calls
3535 * need fixing before the lock is actually useful!
3536 */
3537 scoped_guard(console_lock)
3538 scrollfront(vc: vc_cons[fg_console].d, lines);
3539 break;
3540 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3541 scoped_guard(console_lock) {
3542 ignore_poke = 1;
3543 do_blank_screen(entering_gfx: 0);
3544 }
3545 break;
3546 case TIOCL_BLANKEDSCREEN:
3547 return console_blanked;
3548 case TIOCL_GETBRACKETEDPASTE:
3549 return get_bracketed_paste(tty);
3550 default:
3551 return -EINVAL;
3552 }
3553
3554 return ret;
3555}
3556
3557/*
3558 * /dev/ttyN handling
3559 */
3560
3561static ssize_t con_write(struct tty_struct *tty, const u8 *buf, size_t count)
3562{
3563 int retval;
3564
3565 retval = do_con_write(tty, buf, count);
3566 con_flush_chars(tty);
3567
3568 return retval;
3569}
3570
3571static int con_put_char(struct tty_struct *tty, u8 ch)
3572{
3573 return do_con_write(tty, buf: &ch, count: 1);
3574}
3575
3576static unsigned int con_write_room(struct tty_struct *tty)
3577{
3578 if (tty->flow.stopped)
3579 return 0;
3580 return 32768; /* No limit, really; we're not buffering */
3581}
3582
3583/*
3584 * con_throttle and con_unthrottle are only used for
3585 * paste_selection(), which has to stuff in a large number of
3586 * characters...
3587 */
3588static void con_throttle(struct tty_struct *tty)
3589{
3590}
3591
3592static void con_unthrottle(struct tty_struct *tty)
3593{
3594 struct vc_data *vc = tty->driver_data;
3595
3596 wake_up_interruptible(&vc->paste_wait);
3597}
3598
3599/*
3600 * Turn the Scroll-Lock LED on when the tty is stopped
3601 */
3602static void con_stop(struct tty_struct *tty)
3603{
3604 int console_num;
3605 if (!tty)
3606 return;
3607 console_num = tty->index;
3608 if (!vc_cons_allocated(i: console_num))
3609 return;
3610 vt_kbd_con_stop(console: console_num);
3611}
3612
3613/*
3614 * Turn the Scroll-Lock LED off when the console is started
3615 */
3616static void con_start(struct tty_struct *tty)
3617{
3618 int console_num;
3619 if (!tty)
3620 return;
3621 console_num = tty->index;
3622 if (!vc_cons_allocated(i: console_num))
3623 return;
3624 vt_kbd_con_start(console: console_num);
3625}
3626
3627static void con_flush_chars(struct tty_struct *tty)
3628{
3629 struct vc_data *vc = tty->driver_data;
3630
3631 if (in_interrupt()) /* from flush_to_ldisc */
3632 return;
3633
3634 guard(console_lock)();
3635 set_cursor(vc);
3636}
3637
3638/*
3639 * Allocate the console screen memory.
3640 */
3641static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3642{
3643 unsigned int currcons = tty->index;
3644 struct vc_data *vc;
3645 int ret;
3646
3647 guard(console_lock)();
3648 ret = vc_allocate(currcons);
3649 if (ret)
3650 return ret;
3651
3652 vc = vc_cons[currcons].d;
3653
3654 /* Still being freed */
3655 if (vc->port.tty)
3656 return -ERESTARTSYS;
3657
3658 ret = tty_port_install(port: &vc->port, driver, tty);
3659 if (ret)
3660 return ret;
3661
3662 tty->driver_data = vc;
3663 vc->port.tty = tty;
3664 tty_port_get(port: &vc->port);
3665
3666 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3667 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3668 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3669 }
3670 if (vc->vc_utf)
3671 tty->termios.c_iflag |= IUTF8;
3672 else
3673 tty->termios.c_iflag &= ~IUTF8;
3674
3675 return 0;
3676}
3677
3678static int con_open(struct tty_struct *tty, struct file *filp)
3679{
3680 /* everything done in install */
3681 return 0;
3682}
3683
3684
3685static void con_close(struct tty_struct *tty, struct file *filp)
3686{
3687 /* Nothing to do - we defer to shutdown */
3688}
3689
3690static void con_shutdown(struct tty_struct *tty)
3691{
3692 struct vc_data *vc = tty->driver_data;
3693 BUG_ON(vc == NULL);
3694
3695 guard(console_lock)();
3696 vc->port.tty = NULL;
3697}
3698
3699static void con_cleanup(struct tty_struct *tty)
3700{
3701 struct vc_data *vc = tty->driver_data;
3702
3703 tty_port_put(port: &vc->port);
3704}
3705
3706/*
3707 * We can't deal with anything but the N_TTY ldisc,
3708 * because we can sleep in our write() routine.
3709 */
3710static int con_ldisc_ok(struct tty_struct *tty, int ldisc)
3711{
3712 return ldisc == N_TTY ? 0 : -EINVAL;
3713}
3714
3715static int default_color = 7; /* white */
3716static int default_italic_color = 2; // green (ASCII)
3717static int default_underline_color = 3; // cyan (ASCII)
3718module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3719module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3720module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3721
3722static void vc_init(struct vc_data *vc, int do_clear)
3723{
3724 int j, k ;
3725
3726 set_origin(vc);
3727 vc->vc_pos = vc->vc_origin;
3728 reset_vc(vc);
3729 for (j=k=0; j<16; j++) {
3730 vc->vc_palette[k++] = default_red[j] ;
3731 vc->vc_palette[k++] = default_grn[j] ;
3732 vc->vc_palette[k++] = default_blu[j] ;
3733 }
3734 vc->vc_def_color = default_color;
3735 vc->vc_ulcolor = default_underline_color;
3736 vc->vc_itcolor = default_italic_color;
3737 vc->vc_halfcolor = 0x08; /* grey */
3738 init_waitqueue_head(&vc->paste_wait);
3739 reset_terminal(vc, do_clear);
3740}
3741
3742/*
3743 * This routine initializes console interrupts, and does nothing
3744 * else. If you want the screen to clear, call tty_write with
3745 * the appropriate escape-sequence.
3746 */
3747
3748static int __init con_init(void)
3749{
3750 const char *display_desc = NULL;
3751 struct vc_data *vc;
3752 unsigned int currcons = 0, i;
3753
3754 console_lock();
3755
3756 if (!conswitchp)
3757 conswitchp = &dummy_con;
3758 display_desc = conswitchp->con_startup();
3759 if (!display_desc) {
3760 fg_console = 0;
3761 console_unlock();
3762 return 0;
3763 }
3764
3765 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3766 struct con_driver *con_driver = &registered_con_driver[i];
3767
3768 if (con_driver->con == NULL) {
3769 con_driver->con = conswitchp;
3770 con_driver->desc = display_desc;
3771 con_driver->flag = CON_DRIVER_FLAG_INIT;
3772 con_driver->first = 0;
3773 con_driver->last = MAX_NR_CONSOLES - 1;
3774 break;
3775 }
3776 }
3777
3778 for (i = 0; i < MAX_NR_CONSOLES; i++)
3779 con_driver_map[i] = conswitchp;
3780
3781 if (blankinterval) {
3782 blank_state = blank_normal_wait;
3783 mod_timer(timer: &console_timer, expires: jiffies + (blankinterval * HZ));
3784 }
3785
3786 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3787 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3788 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3789 tty_port_init(port: &vc->port);
3790 visual_init(vc, num: currcons, init: true);
3791 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3792 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3793 vc_init(vc, do_clear: currcons || !vc->vc_sw->con_save_screen);
3794 }
3795 currcons = fg_console = 0;
3796 master_display_fg = vc = vc_cons[currcons].d;
3797 set_origin(vc);
3798 save_screen(vc);
3799 gotoxy(vc, new_x: vc->state.x, new_y: vc->state.y);
3800 csi_J(vc, vpar: CSI_J_CURSOR_TO_END);
3801 update_screen(vc);
3802 pr_info("Console: %s %s %dx%d\n",
3803 vc->vc_can_do_color ? "colour" : "mono",
3804 display_desc, vc->vc_cols, vc->vc_rows);
3805
3806 console_unlock();
3807
3808#ifdef CONFIG_VT_CONSOLE
3809 register_console(&vt_console_driver);
3810#endif
3811 return 0;
3812}
3813console_initcall(con_init);
3814
3815static const struct tty_operations con_ops = {
3816 .install = con_install,
3817 .open = con_open,
3818 .close = con_close,
3819 .write = con_write,
3820 .write_room = con_write_room,
3821 .put_char = con_put_char,
3822 .flush_chars = con_flush_chars,
3823 .ioctl = vt_ioctl,
3824#ifdef CONFIG_COMPAT
3825 .compat_ioctl = vt_compat_ioctl,
3826#endif
3827 .stop = con_stop,
3828 .start = con_start,
3829 .throttle = con_throttle,
3830 .unthrottle = con_unthrottle,
3831 .resize = vt_resize,
3832 .shutdown = con_shutdown,
3833 .cleanup = con_cleanup,
3834 .ldisc_ok = con_ldisc_ok,
3835};
3836
3837static struct cdev vc0_cdev;
3838
3839static ssize_t show_tty_active(struct device *dev,
3840 struct device_attribute *attr, char *buf)
3841{
3842 return sprintf(buf, fmt: "tty%d\n", fg_console + 1);
3843}
3844static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3845
3846static struct attribute *vt_dev_attrs[] = {
3847 &dev_attr_active.attr,
3848 NULL
3849};
3850
3851ATTRIBUTE_GROUPS(vt_dev);
3852
3853int __init vty_init(const struct file_operations *console_fops)
3854{
3855 cdev_init(&vc0_cdev, console_fops);
3856 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3857 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3858 panic(fmt: "Couldn't register /dev/tty0 driver\n");
3859 tty0dev = device_create_with_groups(cls: &tty_class, NULL,
3860 MKDEV(TTY_MAJOR, 0), NULL,
3861 groups: vt_dev_groups, fmt: "tty0");
3862 if (IS_ERR(ptr: tty0dev))
3863 tty0dev = NULL;
3864
3865 vcs_init();
3866
3867 console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3868 TTY_DRIVER_RESET_TERMIOS);
3869 if (IS_ERR(ptr: console_driver))
3870 panic(fmt: "Couldn't allocate console driver\n");
3871
3872 console_driver->name = "tty";
3873 console_driver->name_base = 1;
3874 console_driver->major = TTY_MAJOR;
3875 console_driver->minor_start = 1;
3876 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3877 console_driver->init_termios = tty_std_termios;
3878 if (default_utf8)
3879 console_driver->init_termios.c_iflag |= IUTF8;
3880 tty_set_operations(driver: console_driver, op: &con_ops);
3881 if (tty_register_driver(driver: console_driver))
3882 panic(fmt: "Couldn't register console driver\n");
3883 kbd_init();
3884 console_map_init();
3885#ifdef CONFIG_MDA_CONSOLE
3886 mda_console_init();
3887#endif
3888 return 0;
3889}
3890
3891static const struct class vtconsole_class = {
3892 .name = "vtconsole",
3893};
3894
3895static int do_bind_con_driver(const struct consw *csw, int first, int last,
3896 int deflt)
3897{
3898 struct module *owner = csw->owner;
3899 const char *desc = NULL;
3900 struct con_driver *con_driver;
3901 int i, j = -1, k = -1, retval = -ENODEV;
3902
3903 if (!try_module_get(module: owner))
3904 return -ENODEV;
3905
3906 WARN_CONSOLE_UNLOCKED();
3907
3908 /* check if driver is registered */
3909 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3910 con_driver = &registered_con_driver[i];
3911
3912 if (con_driver->con == csw) {
3913 desc = con_driver->desc;
3914 retval = 0;
3915 break;
3916 }
3917 }
3918
3919 if (retval)
3920 goto err;
3921
3922 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3923 csw->con_startup();
3924 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3925 }
3926
3927 if (deflt) {
3928 if (conswitchp)
3929 module_put(module: conswitchp->owner);
3930
3931 __module_get(module: owner);
3932 conswitchp = csw;
3933 }
3934
3935 first = max(first, con_driver->first);
3936 last = min(last, con_driver->last);
3937
3938 for (i = first; i <= last; i++) {
3939 int old_was_color;
3940 struct vc_data *vc = vc_cons[i].d;
3941
3942 if (con_driver_map[i])
3943 module_put(module: con_driver_map[i]->owner);
3944 __module_get(module: owner);
3945 con_driver_map[i] = csw;
3946
3947 if (!vc || !vc->vc_sw)
3948 continue;
3949
3950 j = i;
3951
3952 if (con_is_visible(vc)) {
3953 k = i;
3954 save_screen(vc);
3955 }
3956
3957 old_was_color = vc->vc_can_do_color;
3958 vc->vc_sw->con_deinit(vc);
3959 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3960 visual_init(vc, num: i, init: false);
3961 set_origin(vc);
3962 update_attr(vc);
3963
3964 /* If the console changed between mono <-> color, then
3965 * the attributes in the screenbuf will be wrong. The
3966 * following resets all attributes to something sane.
3967 */
3968 if (old_was_color != vc->vc_can_do_color)
3969 clear_buffer_attributes(vc);
3970 }
3971
3972 pr_info("Console: switching ");
3973 if (!deflt)
3974 pr_cont("consoles %d-%d ", first + 1, last + 1);
3975 if (j >= 0) {
3976 struct vc_data *vc = vc_cons[j].d;
3977
3978 pr_cont("to %s %s %dx%d\n",
3979 vc->vc_can_do_color ? "colour" : "mono",
3980 desc, vc->vc_cols, vc->vc_rows);
3981
3982 if (k >= 0) {
3983 vc = vc_cons[k].d;
3984 update_screen(vc);
3985 }
3986 } else {
3987 pr_cont("to %s\n", desc);
3988 }
3989
3990 retval = 0;
3991err:
3992 module_put(module: owner);
3993 return retval;
3994};
3995
3996
3997#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3998int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3999{
4000 struct module *owner = csw->owner;
4001 const struct consw *defcsw = NULL;
4002 struct con_driver *con_driver = NULL, *con_back = NULL;
4003 int i, retval = -ENODEV;
4004
4005 if (!try_module_get(owner))
4006 return -ENODEV;
4007
4008 WARN_CONSOLE_UNLOCKED();
4009
4010 /* check if driver is registered and if it is unbindable */
4011 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4012 con_driver = &registered_con_driver[i];
4013
4014 if (con_driver->con == csw &&
4015 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
4016 retval = 0;
4017 break;
4018 }
4019 }
4020
4021 if (retval)
4022 goto err;
4023
4024 retval = -ENODEV;
4025
4026 /* check if backup driver exists */
4027 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4028 con_back = &registered_con_driver[i];
4029
4030 if (con_back->con && con_back->con != csw) {
4031 defcsw = con_back->con;
4032 retval = 0;
4033 break;
4034 }
4035 }
4036
4037 if (retval)
4038 goto err;
4039
4040 if (!con_is_bound(csw))
4041 goto err;
4042
4043 first = max(first, con_driver->first);
4044 last = min(last, con_driver->last);
4045
4046 for (i = first; i <= last; i++) {
4047 if (con_driver_map[i] == csw) {
4048 module_put(csw->owner);
4049 con_driver_map[i] = NULL;
4050 }
4051 }
4052
4053 if (!con_is_bound(defcsw)) {
4054 const struct consw *defconsw = conswitchp;
4055
4056 defcsw->con_startup();
4057 con_back->flag |= CON_DRIVER_FLAG_INIT;
4058 /*
4059 * vgacon may change the default driver to point
4060 * to dummycon, we restore it here...
4061 */
4062 conswitchp = defconsw;
4063 }
4064
4065 if (!con_is_bound(csw))
4066 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
4067
4068 /* ignore return value, binding should not fail */
4069 do_bind_con_driver(defcsw, first, last, deflt);
4070err:
4071 module_put(owner);
4072 return retval;
4073
4074}
4075EXPORT_SYMBOL_GPL(do_unbind_con_driver);
4076
4077static int vt_bind(struct con_driver *con)
4078{
4079 const struct consw *defcsw = NULL, *csw = NULL;
4080 int i, more = 1, first = -1, last = -1, deflt = 0;
4081
4082 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
4083 goto err;
4084
4085 csw = con->con;
4086
4087 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4088 struct con_driver *con = &registered_con_driver[i];
4089
4090 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
4091 defcsw = con->con;
4092 break;
4093 }
4094 }
4095
4096 if (!defcsw)
4097 goto err;
4098
4099 while (more) {
4100 more = 0;
4101
4102 for (i = con->first; i <= con->last; i++) {
4103 if (con_driver_map[i] == defcsw) {
4104 if (first == -1)
4105 first = i;
4106 last = i;
4107 more = 1;
4108 } else if (first != -1)
4109 break;
4110 }
4111
4112 if (first == 0 && last == MAX_NR_CONSOLES -1)
4113 deflt = 1;
4114
4115 if (first != -1)
4116 do_bind_con_driver(csw, first, last, deflt);
4117
4118 first = -1;
4119 last = -1;
4120 deflt = 0;
4121 }
4122
4123err:
4124 return 0;
4125}
4126
4127static int vt_unbind(struct con_driver *con)
4128{
4129 const struct consw *csw = NULL;
4130 int i, more = 1, first = -1, last = -1, deflt = 0;
4131 int ret;
4132
4133 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
4134 goto err;
4135
4136 csw = con->con;
4137
4138 while (more) {
4139 more = 0;
4140
4141 for (i = con->first; i <= con->last; i++) {
4142 if (con_driver_map[i] == csw) {
4143 if (first == -1)
4144 first = i;
4145 last = i;
4146 more = 1;
4147 } else if (first != -1)
4148 break;
4149 }
4150
4151 if (first == 0 && last == MAX_NR_CONSOLES -1)
4152 deflt = 1;
4153
4154 if (first != -1) {
4155 ret = do_unbind_con_driver(csw, first, last, deflt);
4156 if (ret != 0)
4157 return ret;
4158 }
4159
4160 first = -1;
4161 last = -1;
4162 deflt = 0;
4163 }
4164
4165err:
4166 return 0;
4167}
4168#else
4169static inline int vt_bind(struct con_driver *con)
4170{
4171 return 0;
4172}
4173static inline int vt_unbind(struct con_driver *con)
4174{
4175 return 0;
4176}
4177#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
4178
4179static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
4180 const char *buf, size_t count)
4181{
4182 struct con_driver *con = dev_get_drvdata(dev);
4183 int bind = simple_strtoul(buf, NULL, 0);
4184
4185 guard(console_lock)();
4186
4187 if (bind)
4188 vt_bind(con);
4189 else
4190 vt_unbind(con);
4191
4192 return count;
4193}
4194
4195static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
4196 char *buf)
4197{
4198 struct con_driver *con = dev_get_drvdata(dev);
4199 int bind;
4200
4201 scoped_guard(console_lock)
4202 bind = con_is_bound(csw: con->con);
4203
4204 return sysfs_emit(buf, fmt: "%i\n", bind);
4205}
4206
4207static ssize_t show_name(struct device *dev, struct device_attribute *attr,
4208 char *buf)
4209{
4210 struct con_driver *con = dev_get_drvdata(dev);
4211
4212 return sysfs_emit(buf, fmt: "%s %s\n",
4213 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
4214 con->desc);
4215
4216}
4217
4218static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
4219static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
4220
4221static struct attribute *con_dev_attrs[] = {
4222 &dev_attr_bind.attr,
4223 &dev_attr_name.attr,
4224 NULL
4225};
4226
4227ATTRIBUTE_GROUPS(con_dev);
4228
4229static int vtconsole_init_device(struct con_driver *con)
4230{
4231 con->flag |= CON_DRIVER_FLAG_ATTR;
4232 return 0;
4233}
4234
4235static void vtconsole_deinit_device(struct con_driver *con)
4236{
4237 con->flag &= ~CON_DRIVER_FLAG_ATTR;
4238}
4239
4240/**
4241 * con_is_bound - checks if driver is bound to the console
4242 * @csw: console driver
4243 *
4244 * RETURNS: zero if unbound, nonzero if bound
4245 *
4246 * Drivers can call this and if zero, they should release
4247 * all resources allocated on &consw.con_startup()
4248 */
4249int con_is_bound(const struct consw *csw)
4250{
4251 int i, bound = 0;
4252
4253 WARN_CONSOLE_UNLOCKED();
4254
4255 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4256 if (con_driver_map[i] == csw) {
4257 bound = 1;
4258 break;
4259 }
4260 }
4261
4262 return bound;
4263}
4264EXPORT_SYMBOL(con_is_bound);
4265
4266/**
4267 * con_is_visible - checks whether the current console is visible
4268 * @vc: virtual console
4269 *
4270 * RETURNS: zero if not visible, nonzero if visible
4271 */
4272bool con_is_visible(const struct vc_data *vc)
4273{
4274 WARN_CONSOLE_UNLOCKED();
4275
4276 return *vc->vc_display_fg == vc;
4277}
4278EXPORT_SYMBOL(con_is_visible);
4279
4280/**
4281 * con_debug_enter - prepare the console for the kernel debugger
4282 * @vc: virtual console
4283 *
4284 * Called when the console is taken over by the kernel debugger, this
4285 * function needs to save the current console state, then put the console
4286 * into a state suitable for the kernel debugger.
4287 */
4288void con_debug_enter(struct vc_data *vc)
4289{
4290 saved_fg_console = fg_console;
4291 saved_last_console = last_console;
4292 saved_want_console = want_console;
4293 saved_vc_mode = vc->vc_mode;
4294 saved_console_blanked = console_blanked;
4295 vc->vc_mode = KD_TEXT;
4296 console_blanked = 0;
4297 if (vc->vc_sw->con_debug_enter)
4298 vc->vc_sw->con_debug_enter(vc);
4299#ifdef CONFIG_KGDB_KDB
4300 /* Set the initial LINES variable if it is not already set */
4301 if (vc->vc_rows < 999) {
4302 int linecount;
4303 char lns[4];
4304 const char *setargs[3] = {
4305 "set",
4306 "LINES",
4307 lns,
4308 };
4309 if (kdbgetintenv(setargs[0], &linecount)) {
4310 snprintf(lns, 4, "%i", vc->vc_rows);
4311 kdb_set(2, setargs);
4312 }
4313 }
4314 if (vc->vc_cols < 999) {
4315 int colcount;
4316 char cols[4];
4317 const char *setargs[3] = {
4318 "set",
4319 "COLUMNS",
4320 cols,
4321 };
4322 if (kdbgetintenv(setargs[0], &colcount)) {
4323 snprintf(cols, 4, "%i", vc->vc_cols);
4324 kdb_set(2, setargs);
4325 }
4326 }
4327#endif /* CONFIG_KGDB_KDB */
4328}
4329EXPORT_SYMBOL_GPL(con_debug_enter);
4330
4331/**
4332 * con_debug_leave - restore console state
4333 *
4334 * Restore the console state to what it was before the kernel debugger
4335 * was invoked.
4336 */
4337void con_debug_leave(void)
4338{
4339 struct vc_data *vc;
4340
4341 fg_console = saved_fg_console;
4342 last_console = saved_last_console;
4343 want_console = saved_want_console;
4344 console_blanked = saved_console_blanked;
4345 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4346
4347 vc = vc_cons[fg_console].d;
4348 if (vc->vc_sw->con_debug_leave)
4349 vc->vc_sw->con_debug_leave(vc);
4350}
4351EXPORT_SYMBOL_GPL(con_debug_leave);
4352
4353static int do_register_con_driver(const struct consw *csw, int first, int last)
4354{
4355 struct module *owner = csw->owner;
4356 struct con_driver *con_driver;
4357 const char *desc;
4358 int i, retval;
4359
4360 WARN_CONSOLE_UNLOCKED();
4361
4362 if (!try_module_get(module: owner))
4363 return -ENODEV;
4364
4365 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4366 con_driver = &registered_con_driver[i];
4367
4368 /* already registered */
4369 if (con_driver->con == csw) {
4370 retval = -EBUSY;
4371 goto err;
4372 }
4373 }
4374
4375 desc = csw->con_startup();
4376 if (!desc) {
4377 retval = -ENODEV;
4378 goto err;
4379 }
4380
4381 retval = -EINVAL;
4382
4383 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4384 con_driver = &registered_con_driver[i];
4385
4386 if (con_driver->con == NULL &&
4387 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4388 con_driver->con = csw;
4389 con_driver->desc = desc;
4390 con_driver->node = i;
4391 con_driver->flag = CON_DRIVER_FLAG_MODULE |
4392 CON_DRIVER_FLAG_INIT;
4393 con_driver->first = first;
4394 con_driver->last = last;
4395 retval = 0;
4396 break;
4397 }
4398 }
4399
4400 if (retval)
4401 goto err;
4402
4403 con_driver->dev =
4404 device_create_with_groups(cls: &vtconsole_class, NULL,
4405 MKDEV(0, con_driver->node),
4406 drvdata: con_driver, groups: con_dev_groups,
4407 fmt: "vtcon%i", con_driver->node);
4408 if (IS_ERR(ptr: con_driver->dev)) {
4409 pr_warn("Unable to create device for %s; errno = %ld\n",
4410 con_driver->desc, PTR_ERR(con_driver->dev));
4411 con_driver->dev = NULL;
4412 } else {
4413 vtconsole_init_device(con: con_driver);
4414 }
4415
4416err:
4417 module_put(module: owner);
4418 return retval;
4419}
4420
4421
4422/**
4423 * do_unregister_con_driver - unregister console driver from console layer
4424 * @csw: console driver
4425 *
4426 * DESCRIPTION: All drivers that registers to the console layer must
4427 * call this function upon exit, or if the console driver is in a state
4428 * where it won't be able to handle console services, such as the
4429 * framebuffer console without loaded framebuffer drivers.
4430 *
4431 * The driver must unbind first prior to unregistration.
4432 */
4433int do_unregister_con_driver(const struct consw *csw)
4434{
4435 int i;
4436
4437 /* cannot unregister a bound driver */
4438 if (con_is_bound(csw))
4439 return -EBUSY;
4440
4441 if (csw == conswitchp)
4442 return -EINVAL;
4443
4444 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4445 struct con_driver *con_driver = &registered_con_driver[i];
4446
4447 if (con_driver->con == csw) {
4448 /*
4449 * Defer the removal of the sysfs entries since that
4450 * will acquire the kernfs s_active lock and we can't
4451 * acquire this lock while holding the console lock:
4452 * the unbind sysfs entry imposes already the opposite
4453 * order. Reset con already here to prevent any later
4454 * lookup to succeed and mark this slot as zombie, so
4455 * it won't get reused until we complete the removal
4456 * in the deferred work.
4457 */
4458 con_driver->con = NULL;
4459 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4460 schedule_work(work: &con_driver_unregister_work);
4461
4462 return 0;
4463 }
4464 }
4465
4466 return -ENODEV;
4467}
4468EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4469
4470static void con_driver_unregister_callback(struct work_struct *ignored)
4471{
4472 int i;
4473
4474 guard(console_lock)();
4475
4476 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4477 struct con_driver *con_driver = &registered_con_driver[i];
4478
4479 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4480 continue;
4481
4482 console_unlock();
4483
4484 vtconsole_deinit_device(con: con_driver);
4485 device_destroy(cls: &vtconsole_class, MKDEV(0, con_driver->node));
4486
4487 console_lock();
4488
4489 if (WARN_ON_ONCE(con_driver->con))
4490 con_driver->con = NULL;
4491 con_driver->desc = NULL;
4492 con_driver->dev = NULL;
4493 con_driver->node = 0;
4494 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4495 con_driver->flag = 0;
4496 con_driver->first = 0;
4497 con_driver->last = 0;
4498 }
4499}
4500
4501/*
4502 * If we support more console drivers, this function is used
4503 * when a driver wants to take over some existing consoles
4504 * and become default driver for newly opened ones.
4505 *
4506 * do_take_over_console is basically a register followed by bind
4507 */
4508int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4509{
4510 int err;
4511
4512 err = do_register_con_driver(csw, first, last);
4513 /*
4514 * If we get an busy error we still want to bind the console driver
4515 * and return success, as we may have unbound the console driver
4516 * but not unregistered it.
4517 */
4518 if (err == -EBUSY)
4519 err = 0;
4520 if (!err)
4521 do_bind_con_driver(csw, first, last, deflt);
4522
4523 return err;
4524}
4525EXPORT_SYMBOL_GPL(do_take_over_console);
4526
4527
4528/*
4529 * give_up_console is a wrapper to unregister_con_driver. It will only
4530 * work if driver is fully unbound.
4531 */
4532void give_up_console(const struct consw *csw)
4533{
4534 guard(console_lock)();
4535 do_unregister_con_driver(csw);
4536}
4537EXPORT_SYMBOL(give_up_console);
4538
4539static int __init vtconsole_class_init(void)
4540{
4541 int i;
4542
4543 i = class_register(class: &vtconsole_class);
4544 if (i)
4545 pr_warn("Unable to create vt console class; errno = %d\n", i);
4546
4547 /* Add system drivers to sysfs */
4548 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4549 struct con_driver *con = &registered_con_driver[i];
4550
4551 if (con->con && !con->dev) {
4552 con->dev =
4553 device_create_with_groups(cls: &vtconsole_class, NULL,
4554 MKDEV(0, con->node),
4555 drvdata: con, groups: con_dev_groups,
4556 fmt: "vtcon%i", con->node);
4557
4558 if (IS_ERR(ptr: con->dev)) {
4559 pr_warn("Unable to create device for %s; errno = %ld\n",
4560 con->desc, PTR_ERR(con->dev));
4561 con->dev = NULL;
4562 } else {
4563 vtconsole_init_device(con);
4564 }
4565 }
4566 }
4567
4568 return 0;
4569}
4570postcore_initcall(vtconsole_class_init);
4571
4572/*
4573 * Screen blanking
4574 */
4575
4576static int set_vesa_blanking(u8 __user *mode_user)
4577{
4578 u8 mode;
4579
4580 if (get_user(mode, mode_user))
4581 return -EFAULT;
4582
4583 guard(console_lock)();
4584 vesa_blank_mode = (mode <= VESA_BLANK_MAX) ? mode : VESA_NO_BLANKING;
4585
4586 return 0;
4587}
4588
4589void do_blank_screen(int entering_gfx)
4590{
4591 struct vc_data *vc = vc_cons[fg_console].d;
4592 int i;
4593
4594 might_sleep();
4595
4596 WARN_CONSOLE_UNLOCKED();
4597
4598 if (console_blanked) {
4599 if (blank_state == blank_vesa_wait) {
4600 blank_state = blank_off;
4601 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4602 }
4603 return;
4604 }
4605
4606 /* entering graphics mode? */
4607 if (entering_gfx) {
4608 hide_cursor(vc);
4609 save_screen(vc);
4610 vc->vc_sw->con_blank(vc, VESA_VSYNC_SUSPEND, 1);
4611 console_blanked = fg_console + 1;
4612 blank_state = blank_off;
4613 set_origin(vc);
4614 return;
4615 }
4616
4617 blank_state = blank_off;
4618
4619 /* don't blank graphics */
4620 if (vc->vc_mode != KD_TEXT) {
4621 console_blanked = fg_console + 1;
4622 return;
4623 }
4624
4625 hide_cursor(vc);
4626 timer_delete_sync(timer: &console_timer);
4627 blank_timer_expired = 0;
4628
4629 save_screen(vc);
4630 /* In case we need to reset origin, blanking hook returns 1 */
4631 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? VESA_VSYNC_SUSPEND :
4632 (vesa_blank_mode + 1), 0);
4633 console_blanked = fg_console + 1;
4634 if (i)
4635 set_origin(vc);
4636
4637 if (console_blank_hook && console_blank_hook(1))
4638 return;
4639
4640 if (vesa_off_interval && vesa_blank_mode) {
4641 blank_state = blank_vesa_wait;
4642 mod_timer(timer: &console_timer, expires: jiffies + vesa_off_interval);
4643 }
4644 vt_event_post(VT_EVENT_BLANK, old: vc->vc_num, new: vc->vc_num);
4645}
4646EXPORT_SYMBOL(do_blank_screen);
4647
4648/*
4649 * Called by timer as well as from vt_console_driver
4650 */
4651void do_unblank_screen(int leaving_gfx)
4652{
4653 struct vc_data *vc;
4654
4655 /* This should now always be called from a "sane" (read: can schedule)
4656 * context for the sake of the low level drivers, except in the special
4657 * case of oops_in_progress
4658 */
4659 if (!oops_in_progress)
4660 might_sleep();
4661
4662 WARN_CONSOLE_UNLOCKED();
4663
4664 ignore_poke = 0;
4665 if (!console_blanked)
4666 return;
4667 if (!vc_cons_allocated(i: fg_console)) {
4668 /* impossible */
4669 pr_warn("unblank_screen: tty %d not allocated ??\n",
4670 fg_console + 1);
4671 return;
4672 }
4673 vc = vc_cons[fg_console].d;
4674 if (vc->vc_mode != KD_TEXT)
4675 return; /* but leave console_blanked != 0 */
4676
4677 if (blankinterval) {
4678 mod_timer(timer: &console_timer, expires: jiffies + (blankinterval * HZ));
4679 blank_state = blank_normal_wait;
4680 }
4681
4682 console_blanked = 0;
4683 if (vc->vc_sw->con_blank(vc, VESA_NO_BLANKING, leaving_gfx))
4684 /* Low-level driver cannot restore -> do it ourselves */
4685 update_screen(vc);
4686 if (console_blank_hook)
4687 console_blank_hook(0);
4688 set_palette(vc);
4689 set_cursor(vc);
4690 vt_event_post(VT_EVENT_UNBLANK, old: vc->vc_num, new: vc->vc_num);
4691 notify_update(vc);
4692}
4693EXPORT_SYMBOL(do_unblank_screen);
4694
4695/*
4696 * This is called by the outside world to cause a forced unblank, mostly for
4697 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4698 * call it with 1 as an argument and so force a mode restore... that may kill
4699 * X or at least garbage the screen but would also make the Oops visible...
4700 */
4701static void unblank_screen(void)
4702{
4703 do_unblank_screen(0);
4704}
4705
4706/*
4707 * We defer the timer blanking to work queue so it can take the console mutex
4708 * (console operations can still happen at irq time, but only from printk which
4709 * has the console mutex. Not perfect yet, but better than no locking
4710 */
4711static void blank_screen_t(struct timer_list *unused)
4712{
4713 blank_timer_expired = 1;
4714 schedule_work(work: &console_work);
4715}
4716
4717void poke_blanked_console(void)
4718{
4719 WARN_CONSOLE_UNLOCKED();
4720
4721 /* Add this so we quickly catch whoever might call us in a non
4722 * safe context. Nowadays, unblank_screen() isn't to be called in
4723 * atomic contexts and is allowed to schedule (with the special case
4724 * of oops_in_progress, but that isn't of any concern for this
4725 * function. --BenH.
4726 */
4727 might_sleep();
4728
4729 /* This isn't perfectly race free, but a race here would be mostly harmless,
4730 * at worst, we'll do a spurious blank and it's unlikely
4731 */
4732 timer_delete(timer: &console_timer);
4733 blank_timer_expired = 0;
4734
4735 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4736 return;
4737 if (console_blanked)
4738 unblank_screen();
4739 else if (blankinterval) {
4740 mod_timer(timer: &console_timer, expires: jiffies + (blankinterval * HZ));
4741 blank_state = blank_normal_wait;
4742 }
4743}
4744
4745/*
4746 * Palettes
4747 */
4748
4749static void set_palette(struct vc_data *vc)
4750{
4751 WARN_CONSOLE_UNLOCKED();
4752
4753 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4754 vc->vc_sw->con_set_palette(vc, color_table);
4755}
4756
4757/*
4758 * Load palette into the DAC registers. arg points to a colour
4759 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4760 */
4761
4762int con_set_cmap(unsigned char __user *arg)
4763{
4764 int i, j, k;
4765 unsigned char colormap[3*16];
4766
4767 if (copy_from_user(to: colormap, from: arg, n: sizeof(colormap)))
4768 return -EFAULT;
4769
4770 guard(console_lock)();
4771 for (i = k = 0; i < 16; i++) {
4772 default_red[i] = colormap[k++];
4773 default_grn[i] = colormap[k++];
4774 default_blu[i] = colormap[k++];
4775 }
4776 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4777 if (!vc_cons_allocated(i))
4778 continue;
4779 for (j = k = 0; j < 16; j++) {
4780 vc_cons[i].d->vc_palette[k++] = default_red[j];
4781 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4782 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4783 }
4784 set_palette(vc_cons[i].d);
4785 }
4786
4787 return 0;
4788}
4789
4790int con_get_cmap(unsigned char __user *arg)
4791{
4792 int i, k;
4793 unsigned char colormap[3*16];
4794
4795 scoped_guard(console_lock)
4796 for (i = k = 0; i < 16; i++) {
4797 colormap[k++] = default_red[i];
4798 colormap[k++] = default_grn[i];
4799 colormap[k++] = default_blu[i];
4800 }
4801
4802 if (copy_to_user(to: arg, from: colormap, n: sizeof(colormap)))
4803 return -EFAULT;
4804
4805 return 0;
4806}
4807
4808void reset_palette(struct vc_data *vc)
4809{
4810 int j, k;
4811 for (j=k=0; j<16; j++) {
4812 vc->vc_palette[k++] = default_red[j];
4813 vc->vc_palette[k++] = default_grn[j];
4814 vc->vc_palette[k++] = default_blu[j];
4815 }
4816 set_palette(vc);
4817}
4818
4819/*
4820 * Font switching
4821 *
4822 * Currently we only support fonts up to 128 pixels wide, at a maximum height
4823 * of 128 pixels. Userspace fontdata may have to be stored with 32 bytes
4824 * (shorts/ints, depending on width) reserved for each character which is
4825 * kinda wasty, but this is done in order to maintain compatibility with the
4826 * EGA/VGA fonts. It is up to the actual low-level console-driver convert data
4827 * into its favorite format (maybe we should add a `fontoffset' field to the
4828 * `display' structure so we won't have to convert the fontdata all the time.
4829 * /Jes
4830 */
4831
4832#define max_font_width 64
4833#define max_font_height 128
4834#define max_font_glyphs 512
4835#define max_font_size (max_font_glyphs*max_font_width*max_font_height)
4836
4837static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4838{
4839 struct console_font font;
4840 int c;
4841 unsigned int vpitch = op->op == KD_FONT_OP_GET_TALL ? op->height : 32;
4842
4843 if (vpitch > max_font_height)
4844 return -EINVAL;
4845
4846 void *font_data __free(kvfree) = NULL;
4847 if (op->data) {
4848 font.data = font_data = kvzalloc(max_font_size, GFP_KERNEL);
4849 if (!font.data)
4850 return -ENOMEM;
4851 } else
4852 font.data = NULL;
4853
4854 scoped_guard(console_lock) {
4855 if (vc->vc_mode != KD_TEXT)
4856 return -EINVAL;
4857 if (!vc->vc_sw->con_font_get)
4858 return -ENOSYS;
4859
4860 int ret = vc->vc_sw->con_font_get(vc, &font, vpitch);
4861 if (ret)
4862 return ret;
4863 }
4864
4865 c = (font.width+7)/8 * vpitch * font.charcount;
4866
4867 if (op->data && font.charcount > op->charcount)
4868 return -ENOSPC;
4869 if (font.width > op->width || font.height > op->height)
4870 return -ENOSPC;
4871
4872 op->height = font.height;
4873 op->width = font.width;
4874 op->charcount = font.charcount;
4875
4876 if (op->data && copy_to_user(to: op->data, from: font.data, n: c))
4877 return -EFAULT;
4878
4879 return 0;
4880}
4881
4882static int con_font_set(struct vc_data *vc, const struct console_font_op *op)
4883{
4884 struct console_font font;
4885 int size;
4886 unsigned int vpitch = op->op == KD_FONT_OP_SET_TALL ? op->height : 32;
4887
4888 if (!op->data)
4889 return -EINVAL;
4890 if (op->charcount > max_font_glyphs)
4891 return -EINVAL;
4892 if (op->width <= 0 || op->width > max_font_width || !op->height ||
4893 op->height > max_font_height)
4894 return -EINVAL;
4895 if (vpitch < op->height)
4896 return -EINVAL;
4897 size = (op->width+7)/8 * vpitch * op->charcount;
4898 if (size > max_font_size)
4899 return -ENOSPC;
4900
4901 void *font_data __free(kfree) = font.data = memdup_user(op->data, size);
4902 if (IS_ERR(ptr: font.data))
4903 return PTR_ERR(ptr: font.data);
4904
4905 font.charcount = op->charcount;
4906 font.width = op->width;
4907 font.height = op->height;
4908
4909 guard(console_lock)();
4910
4911 if (vc->vc_mode != KD_TEXT)
4912 return -EINVAL;
4913 if (!vc->vc_sw->con_font_set)
4914 return -ENOSYS;
4915
4916 if (vc_is_sel(vc))
4917 clear_selection();
4918
4919 return vc->vc_sw->con_font_set(vc, &font, vpitch, op->flags);
4920}
4921
4922static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4923{
4924 struct console_font font = {.width = op->width, .height = op->height};
4925 char name[MAX_FONT_NAME];
4926 char *s = name;
4927
4928 if (!op->data)
4929 s = NULL;
4930 else if (strncpy_from_user(dst: name, src: op->data, MAX_FONT_NAME - 1) < 0)
4931 return -EFAULT;
4932 else
4933 name[MAX_FONT_NAME - 1] = 0;
4934
4935 scoped_guard(console_lock) {
4936 if (vc->vc_mode != KD_TEXT)
4937 return -EINVAL;
4938 if (!vc->vc_sw->con_font_default)
4939 return -ENOSYS;
4940
4941 if (vc_is_sel(vc))
4942 clear_selection();
4943 int ret = vc->vc_sw->con_font_default(vc, &font, s);
4944 if (ret)
4945 return ret;
4946 }
4947
4948 op->width = font.width;
4949 op->height = font.height;
4950
4951 return 0;
4952}
4953
4954int con_font_op(struct vc_data *vc, struct console_font_op *op)
4955{
4956 switch (op->op) {
4957 case KD_FONT_OP_SET:
4958 case KD_FONT_OP_SET_TALL:
4959 return con_font_set(vc, op);
4960 case KD_FONT_OP_GET:
4961 case KD_FONT_OP_GET_TALL:
4962 return con_font_get(vc, op);
4963 case KD_FONT_OP_SET_DEFAULT:
4964 return con_font_default(vc, op);
4965 case KD_FONT_OP_COPY:
4966 /* was buggy and never really used */
4967 return -EINVAL;
4968 }
4969 return -ENOSYS;
4970}
4971
4972/*
4973 * Interface exported to selection and vcs.
4974 */
4975
4976/* used by selection */
4977u16 screen_glyph(const struct vc_data *vc, int offset)
4978{
4979 u16 w = scr_readw(screenpos(vc, offset, true));
4980 u16 c = w & 0xff;
4981
4982 if (w & vc->vc_hi_font_mask)
4983 c |= 0x100;
4984 return c;
4985}
4986EXPORT_SYMBOL_GPL(screen_glyph);
4987
4988u32 screen_glyph_unicode(const struct vc_data *vc, int n)
4989{
4990 u32 **uni_lines = vc->vc_uni_lines;
4991
4992 if (uni_lines)
4993 return uni_lines[n / vc->vc_cols][n % vc->vc_cols];
4994
4995 return inverse_translate(conp: vc, glyph: screen_glyph(vc, n * 2), use_unicode: true);
4996}
4997EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4998
4999/* used by vcs - note the word offset */
5000unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
5001{
5002 return screenpos(vc, offset: 2 * w_offset, viewed);
5003}
5004EXPORT_SYMBOL_GPL(screen_pos);
5005
5006void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
5007{
5008 /* clamp values if they don't fit */
5009 xy[0] = min(vc->state.x, 0xFFu);
5010 xy[1] = min(vc->state.y, 0xFFu);
5011}
5012
5013void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
5014{
5015 hide_cursor(vc);
5016 gotoxy(vc, new_x: xy[0], new_y: xy[1]);
5017 set_cursor(vc);
5018}
5019
5020u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
5021{
5022 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
5023 return softcursor_original;
5024 return scr_readw(org);
5025}
5026
5027void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
5028{
5029 scr_writew(val, org);
5030 if ((unsigned long)org == vc->vc_pos) {
5031 softcursor_original = -1;
5032 add_softcursor(vc);
5033 }
5034}
5035
5036void vcs_scr_updated(struct vc_data *vc)
5037{
5038 notify_update(vc);
5039}
5040