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Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / tty / vt / vt.c
blob96842ce817af47905ba795b31ef45a27dec8eb66
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6 /*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
61 * deletion SMP-safe. 17Jun00, Andrew Morton
62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72 */
73
74 #include <linux/module.h>
75 #include <linux/types.h>
76 #include <linux/sched/signal.h>
77 #include <linux/tty.h>
78 #include <linux/tty_flip.h>
79 #include <linux/kernel.h>
80 #include <linux/string.h>
81 #include <linux/errno.h>
82 #include <linux/kd.h>
83 #include <linux/slab.h>
84 #include <linux/vmalloc.h>
85 #include <linux/major.h>
86 #include <linux/mm.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/mutex.h>
90 #include <linux/vt_kern.h>
91 #include <linux/selection.h>
92 #include <linux/tiocl.h>
93 #include <linux/kbd_kern.h>
94 #include <linux/consolemap.h>
95 #include <linux/timer.h>
96 #include <linux/interrupt.h>
97 #include <linux/workqueue.h>
98 #include <linux/pm.h>
99 #include <linux/font.h>
100 #include <linux/bitops.h>
101 #include <linux/notifier.h>
102 #include <linux/device.h>
103 #include <linux/io.h>
104 #include <linux/uaccess.h>
105 #include <linux/kdb.h>
106 #include <linux/ctype.h>
107 #include <linux/bsearch.h>
108 #include <linux/gcd.h>
109
110 #define MAX_NR_CON_DRIVER 16
111
112 #define CON_DRIVER_FLAG_MODULE 1
113 #define CON_DRIVER_FLAG_INIT 2
114 #define CON_DRIVER_FLAG_ATTR 4
115 #define CON_DRIVER_FLAG_ZOMBIE 8
116
117 struct con_driver {
118 const struct consw *con;
119 const char *desc;
120 struct device *dev;
121 int node;
122 int first;
123 int last;
124 int flag;
125 };
126
127 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
128 const struct consw *conswitchp;
129
130 /*
131 * Here is the default bell parameters: 750HZ, 1/8th of a second
132 */
133 #define DEFAULT_BELL_PITCH 750
134 #define DEFAULT_BELL_DURATION (HZ/8)
135 #define DEFAULT_CURSOR_BLINK_MS 200
136
137 struct vc vc_cons [MAX_NR_CONSOLES];
138 EXPORT_SYMBOL(vc_cons);
139
140 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
141
142 static int con_open(struct tty_struct *, struct file *);
143 static void vc_init(struct vc_data *vc, int do_clear);
144 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
145 static void save_cur(struct vc_data *vc);
146 static void reset_terminal(struct vc_data *vc, int do_clear);
147 static void con_flush_chars(struct tty_struct *tty);
148 static int set_vesa_blanking(u8 __user *mode);
149 static void set_cursor(struct vc_data *vc);
150 static void hide_cursor(struct vc_data *vc);
151 static void console_callback(struct work_struct *ignored);
152 static void con_driver_unregister_callback(struct work_struct *ignored);
153 static void blank_screen_t(struct timer_list *unused);
154 static void set_palette(struct vc_data *vc);
155 static void unblank_screen(void);
156
157 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
158
159 int default_utf8 = true;
160 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
161 int global_cursor_default = -1;
162 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
163 EXPORT_SYMBOL(global_cursor_default);
164
165 static int cur_default = CUR_UNDERLINE;
166 module_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 */
172 static int ignore_poke;
173
174 int do_poke_blanked_console;
175 int console_blanked;
176 EXPORT_SYMBOL(console_blanked);
177
178 static enum vesa_blank_mode vesa_blank_mode;
179 static int vesa_off_interval;
180 static int blankinterval;
181 core_param(consoleblank, blankinterval, int, 0444);
182
183 static DECLARE_WORK(console_work, console_callback);
184 static 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 */
192 int fg_console;
193 EXPORT_SYMBOL(fg_console);
194 int last_console;
195 int want_console = -1;
196
197 static int saved_fg_console;
198 static int saved_last_console;
199 static int saved_want_console;
200 static int saved_vc_mode;
201 static 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 */
209 static 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 */
221 static int scrollback_delta;
222
223 /*
224 * Hook so that the power management routines can (un)blank
225 * the console on our behalf.
226 */
227 int (*console_blank_hook)(int);
228 EXPORT_SYMBOL(console_blank_hook);
229
230 static DEFINE_TIMER(console_timer, blank_screen_t);
231 static int blank_state;
232 static int blank_timer_expired;
233 enum {
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 */
245 static struct device *tty0dev;
246
247 /*
248 * Notifier list for console events.
249 */
250 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
251
252 int register_vt_notifier(struct notifier_block *nb)
253 {
254 return atomic_notifier_chain_register(&vt_notifier_list, nb);
255 }
256 EXPORT_SYMBOL_GPL(register_vt_notifier);
257
258 int unregister_vt_notifier(struct notifier_block *nb)
259 {
260 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
261 }
262 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
263
264 static void notify_write(struct vc_data *vc, unsigned int unicode)
265 {
266 struct vt_notifier_param param = { .vc = vc, .c = unicode };
267 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
268 }
269
270 static void notify_update(struct vc_data *vc)
271 {
272 struct vt_notifier_param param = { .vc = vc };
273 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
274 }
275 /*
276 * Low-Level Functions
277 */
278
279 static inline bool con_is_fg(const struct vc_data *vc)
280 {
281 return vc->vc_num == fg_console;
282 }
283
284 static inline bool con_should_update(const struct vc_data *vc)
285 {
286 return con_is_visible(vc) && !console_blanked;
287 }
288
289 static 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
297 static 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.. */
306 static 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
315 void schedule_console_callback(void)
316 {
317 schedule_work(&console_work);
318 }
319
320 /*
321 * Code to manage unicode-based screen buffers
322 */
323
324 /*
325 * Our screen buffer is preceded by an array of line pointers so that
326 * scrolling only implies some pointer shuffling.
327 */
328
329 static 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
352 static void vc_uniscr_free(u32 **uni_lines)
353 {
354 vfree(uni_lines);
355 }
356
357 static void vc_uniscr_set(struct vc_data *vc, u32 **new_uni_lines)
358 {
359 vc_uniscr_free(vc->vc_uni_lines);
360 vc->vc_uni_lines = new_uni_lines;
361 }
362
363 static 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
369 static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
370 {
371 if (vc->vc_uni_lines) {
372 u32 *ln = vc->vc_uni_lines[vc->state.y];
373 unsigned int x = vc->state.x, cols = vc->vc_cols;
374
375 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
376 memset32(&ln[x], ' ', nr);
377 }
378 }
379
380 static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
381 {
382 if (vc->vc_uni_lines) {
383 u32 *ln = vc->vc_uni_lines[vc->state.y];
384 unsigned int x = vc->state.x, cols = vc->vc_cols;
385
386 memmove(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
387 memset32(&ln[cols - nr], ' ', nr);
388 }
389 }
390
391 static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
392 unsigned int nr)
393 {
394 if (vc->vc_uni_lines)
395 memset32(&vc->vc_uni_lines[vc->state.y][x], ' ', nr);
396 }
397
398 static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
399 unsigned int nr)
400 {
401 if (vc->vc_uni_lines)
402 while (nr--)
403 memset32(vc->vc_uni_lines[y++], ' ', vc->vc_cols);
404 }
405
406 /* juggling array rotation algorithm (complexity O(N), size complexity O(1)) */
407 static void juggle_array(u32 **array, unsigned int size, unsigned int nr)
408 {
409 unsigned int gcd_idx;
410
411 for (gcd_idx = 0; gcd_idx < gcd(nr, size); gcd_idx++) {
412 u32 *gcd_idx_val = array[gcd_idx];
413 unsigned int dst_idx = gcd_idx;
414
415 while (1) {
416 unsigned int src_idx = (dst_idx + nr) % size;
417 if (src_idx == gcd_idx)
418 break;
419
420 array[dst_idx] = array[src_idx];
421 dst_idx = src_idx;
422 }
423
424 array[dst_idx] = gcd_idx_val;
425 }
426 }
427
428 static void vc_uniscr_scroll(struct vc_data *vc, unsigned int top,
429 unsigned int bottom, enum con_scroll dir,
430 unsigned int nr)
431 {
432 u32 **uni_lines = vc->vc_uni_lines;
433 unsigned int size = bottom - top;
434
435 if (!uni_lines)
436 return;
437
438 if (dir == SM_DOWN) {
439 juggle_array(&uni_lines[top], size, size - nr);
440 vc_uniscr_clear_lines(vc, top, nr);
441 } else {
442 juggle_array(&uni_lines[top], size, nr);
443 vc_uniscr_clear_lines(vc, bottom - nr, nr);
444 }
445 }
446
447 static void vc_uniscr_copy_area(u32 **dst_lines,
448 unsigned int dst_cols,
449 unsigned int dst_rows,
450 u32 **src_lines,
451 unsigned int src_cols,
452 unsigned int src_top_row,
453 unsigned int src_bot_row)
454 {
455 unsigned int dst_row = 0;
456
457 if (!dst_lines)
458 return;
459
460 while (src_top_row < src_bot_row) {
461 u32 *src_line = src_lines[src_top_row];
462 u32 *dst_line = dst_lines[dst_row];
463
464 memcpy(dst_line, src_line, src_cols * sizeof(*src_line));
465 if (dst_cols - src_cols)
466 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
467 src_top_row++;
468 dst_row++;
469 }
470 while (dst_row < dst_rows) {
471 u32 *dst_line = dst_lines[dst_row];
472
473 memset32(dst_line, ' ', dst_cols);
474 dst_row++;
475 }
476 }
477
478 /*
479 * Called from vcs_read() to make sure unicode screen retrieval is possible.
480 * This will initialize the unicode screen buffer if not already done.
481 * This returns 0 if OK, or a negative error code otherwise.
482 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
483 */
484 int vc_uniscr_check(struct vc_data *vc)
485 {
486 u32 **uni_lines;
487 unsigned short *p;
488 int x, y, mask;
489
490 WARN_CONSOLE_UNLOCKED();
491
492 if (!vc->vc_utf)
493 return -ENODATA;
494
495 if (vc->vc_uni_lines)
496 return 0;
497
498 uni_lines = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
499 if (!uni_lines)
500 return -ENOMEM;
501
502 /*
503 * Let's populate it initially with (imperfect) reverse translation.
504 * This is the next best thing we can do short of having it enabled
505 * from the start even when no users rely on this functionality. True
506 * unicode content will be available after a complete screen refresh.
507 */
508 p = (unsigned short *)vc->vc_origin;
509 mask = vc->vc_hi_font_mask | 0xff;
510 for (y = 0; y < vc->vc_rows; y++) {
511 u32 *line = uni_lines[y];
512 for (x = 0; x < vc->vc_cols; x++) {
513 u16 glyph = scr_readw(p++) & mask;
514 line[x] = inverse_translate(vc, glyph, true);
515 }
516 }
517
518 vc->vc_uni_lines = uni_lines;
519
520 return 0;
521 }
522
523 /*
524 * Called from vcs_read() to get the unicode data from the screen.
525 * This must be preceded by a successful call to vc_uniscr_check() once
526 * the console lock has been taken.
527 */
528 void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
529 unsigned int row, unsigned int col, unsigned int nr)
530 {
531 u32 **uni_lines = vc->vc_uni_lines;
532 int offset = row * vc->vc_size_row + col * 2;
533 unsigned long pos;
534
535 if (WARN_ON_ONCE(!uni_lines))
536 return;
537
538 pos = (unsigned long)screenpos(vc, offset, viewed);
539 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
540 /*
541 * Desired position falls in the main screen buffer.
542 * However the actual row/col might be different if
543 * scrollback is active.
544 */
545 row = (pos - vc->vc_origin) / vc->vc_size_row;
546 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
547 memcpy(dest, &uni_lines[row][col], nr * sizeof(u32));
548 } else {
549 /*
550 * Scrollback is active. For now let's simply backtranslate
551 * the screen glyphs until the unicode screen buffer does
552 * synchronize with console display drivers for a scrollback
553 * buffer of its own.
554 */
555 u16 *p = (u16 *)pos;
556 int mask = vc->vc_hi_font_mask | 0xff;
557 u32 *uni_buf = dest;
558 while (nr--) {
559 u16 glyph = scr_readw(p++) & mask;
560 *uni_buf++ = inverse_translate(vc, glyph, true);
561 }
562 }
563 }
564
565 static void con_scroll(struct vc_data *vc, unsigned int top,
566 unsigned int bottom, enum con_scroll dir,
567 unsigned int nr)
568 {
569 unsigned int rows = bottom - top;
570 u16 *clear, *dst, *src;
571
572 if (top + nr >= bottom)
573 nr = rows - 1;
574 if (bottom > vc->vc_rows || top >= bottom || nr < 1)
575 return;
576
577 vc_uniscr_scroll(vc, top, bottom, dir, nr);
578 if (con_is_visible(vc) &&
579 vc->vc_sw->con_scroll(vc, top, bottom, dir, nr))
580 return;
581
582 src = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * top);
583 dst = (u16 *)(vc->vc_origin + vc->vc_size_row * (top + nr));
584
585 if (dir == SM_UP) {
586 clear = src + (rows - nr) * vc->vc_cols;
587 swap(src, dst);
588 }
589 scr_memmovew(dst, src, (rows - nr) * vc->vc_size_row);
590 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
591 }
592
593 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
594 {
595 unsigned int xx, yy, offset;
596 u16 *p = (u16 *)start;
597
598 offset = (start - vc->vc_origin) / 2;
599 xx = offset % vc->vc_cols;
600 yy = offset / vc->vc_cols;
601
602 for(;;) {
603 u16 attrib = scr_readw(p) & 0xff00;
604 int startx = xx;
605 u16 *q = p;
606 while (xx < vc->vc_cols && count) {
607 if (attrib != (scr_readw(p) & 0xff00)) {
608 if (p > q)
609 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
610 startx = xx;
611 q = p;
612 attrib = scr_readw(p) & 0xff00;
613 }
614 p++;
615 xx++;
616 count--;
617 }
618 if (p > q)
619 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
620 if (!count)
621 break;
622 xx = 0;
623 yy++;
624 }
625 }
626
627 void update_region(struct vc_data *vc, unsigned long start, int count)
628 {
629 WARN_CONSOLE_UNLOCKED();
630
631 if (con_should_update(vc)) {
632 hide_cursor(vc);
633 do_update_region(vc, start, count);
634 set_cursor(vc);
635 }
636 }
637 EXPORT_SYMBOL(update_region);
638
639 /* Structure of attributes is hardware-dependent */
640
641 static u8 build_attr(struct vc_data *vc, u8 _color,
642 enum vc_intensity _intensity, bool _blink, bool _underline,
643 bool _reverse, bool _italic)
644 {
645 if (vc->vc_sw->con_build_attr)
646 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
647 _blink, _underline, _reverse, _italic);
648
649 /*
650 * ++roman: I completely changed the attribute format for monochrome
651 * mode (!can_do_color). The formerly used MDA (monochrome display
652 * adapter) format didn't allow the combination of certain effects.
653 * Now the attribute is just a bit vector:
654 * Bit 0..1: intensity (0..2)
655 * Bit 2 : underline
656 * Bit 3 : reverse
657 * Bit 7 : blink
658 */
659 {
660 u8 a = _color;
661 if (!vc->vc_can_do_color)
662 return _intensity |
663 (_italic << 1) |
664 (_underline << 2) |
665 (_reverse << 3) |
666 (_blink << 7);
667 if (_italic)
668 a = (a & 0xF0) | vc->vc_itcolor;
669 else if (_underline)
670 a = (a & 0xf0) | vc->vc_ulcolor;
671 else if (_intensity == VCI_HALF_BRIGHT)
672 a = (a & 0xf0) | vc->vc_halfcolor;
673 if (_reverse)
674 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
675 if (_blink)
676 a ^= 0x80;
677 if (_intensity == VCI_BOLD)
678 a ^= 0x08;
679 if (vc->vc_hi_font_mask == 0x100)
680 a <<= 1;
681 return a;
682 }
683 }
684
685 static void update_attr(struct vc_data *vc)
686 {
687 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
688 vc->state.blink, vc->state.underline,
689 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
690 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
691 VCI_NORMAL, vc->state.blink, false,
692 vc->vc_decscnm, false) << 8);
693 }
694
695 /* Note: inverting the screen twice should revert to the original state */
696 void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
697 {
698 u16 *p;
699
700 WARN_CONSOLE_UNLOCKED();
701
702 count /= 2;
703 p = screenpos(vc, offset, viewed);
704 if (vc->vc_sw->con_invert_region) {
705 vc->vc_sw->con_invert_region(vc, p, count);
706 } else {
707 u16 *q = p;
708 int cnt = count;
709 u16 a;
710
711 if (!vc->vc_can_do_color) {
712 while (cnt--) {
713 a = scr_readw(q);
714 a ^= 0x0800;
715 scr_writew(a, q);
716 q++;
717 }
718 } else if (vc->vc_hi_font_mask == 0x100) {
719 while (cnt--) {
720 a = scr_readw(q);
721 a = (a & 0x11ff) |
722 ((a & 0xe000) >> 4) |
723 ((a & 0x0e00) << 4);
724 scr_writew(a, q);
725 q++;
726 }
727 } else {
728 while (cnt--) {
729 a = scr_readw(q);
730 a = (a & 0x88ff) |
731 ((a & 0x7000) >> 4) |
732 ((a & 0x0700) << 4);
733 scr_writew(a, q);
734 q++;
735 }
736 }
737 }
738
739 if (con_should_update(vc))
740 do_update_region(vc, (unsigned long) p, count);
741 notify_update(vc);
742 }
743
744 /* used by selection: complement pointer position */
745 void complement_pos(struct vc_data *vc, int offset)
746 {
747 static int old_offset = -1;
748 static unsigned short old;
749 static unsigned short oldx, oldy;
750
751 WARN_CONSOLE_UNLOCKED();
752
753 if (old_offset != -1 && old_offset >= 0 &&
754 old_offset < vc->vc_screenbuf_size) {
755 scr_writew(old, screenpos(vc, old_offset, true));
756 if (con_should_update(vc))
757 con_putc(vc, old, oldy, oldx);
758 notify_update(vc);
759 }
760
761 old_offset = offset;
762
763 if (offset != -1 && offset >= 0 &&
764 offset < vc->vc_screenbuf_size) {
765 unsigned short new;
766 u16 *p = screenpos(vc, offset, true);
767 old = scr_readw(p);
768 new = old ^ vc->vc_complement_mask;
769 scr_writew(new, p);
770 if (con_should_update(vc)) {
771 oldx = (offset >> 1) % vc->vc_cols;
772 oldy = (offset >> 1) / vc->vc_cols;
773 con_putc(vc, new, oldy, oldx);
774 }
775 notify_update(vc);
776 }
777 }
778
779 static void insert_char(struct vc_data *vc, unsigned int nr)
780 {
781 unsigned short *p = (unsigned short *) vc->vc_pos;
782
783 vc_uniscr_insert(vc, nr);
784 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
785 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
786 vc->vc_need_wrap = 0;
787 if (con_should_update(vc))
788 do_update_region(vc, (unsigned long) p,
789 vc->vc_cols - vc->state.x);
790 }
791
792 static void delete_char(struct vc_data *vc, unsigned int nr)
793 {
794 unsigned short *p = (unsigned short *) vc->vc_pos;
795
796 vc_uniscr_delete(vc, nr);
797 scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
798 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
799 nr * 2);
800 vc->vc_need_wrap = 0;
801 if (con_should_update(vc))
802 do_update_region(vc, (unsigned long) p,
803 vc->vc_cols - vc->state.x);
804 }
805
806 static int softcursor_original = -1;
807
808 static void add_softcursor(struct vc_data *vc)
809 {
810 int i = scr_readw((u16 *) vc->vc_pos);
811 u32 type = vc->vc_cursor_type;
812
813 if (!(type & CUR_SW))
814 return;
815 if (softcursor_original != -1)
816 return;
817 softcursor_original = i;
818 i |= CUR_SET(type);
819 i ^= CUR_CHANGE(type);
820 if ((type & CUR_ALWAYS_BG) &&
821 (softcursor_original & CUR_BG) == (i & CUR_BG))
822 i ^= CUR_BG;
823 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
824 i ^= CUR_FG;
825 scr_writew(i, (u16 *)vc->vc_pos);
826 if (con_should_update(vc))
827 con_putc(vc, i, vc->state.y, vc->state.x);
828 }
829
830 static void hide_softcursor(struct vc_data *vc)
831 {
832 if (softcursor_original != -1) {
833 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
834 if (con_should_update(vc))
835 con_putc(vc, softcursor_original, vc->state.y,
836 vc->state.x);
837 softcursor_original = -1;
838 }
839 }
840
841 static void hide_cursor(struct vc_data *vc)
842 {
843 if (vc_is_sel(vc))
844 clear_selection();
845
846 vc->vc_sw->con_cursor(vc, false);
847 hide_softcursor(vc);
848 }
849
850 static void set_cursor(struct vc_data *vc)
851 {
852 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
853 return;
854 if (vc->vc_deccm) {
855 if (vc_is_sel(vc))
856 clear_selection();
857 add_softcursor(vc);
858 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
859 vc->vc_sw->con_cursor(vc, true);
860 } else
861 hide_cursor(vc);
862 }
863
864 static void set_origin(struct vc_data *vc)
865 {
866 WARN_CONSOLE_UNLOCKED();
867
868 if (!con_is_visible(vc) ||
869 !vc->vc_sw->con_set_origin ||
870 !vc->vc_sw->con_set_origin(vc))
871 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
872 vc->vc_visible_origin = vc->vc_origin;
873 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
874 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
875 2 * vc->state.x;
876 }
877
878 static void save_screen(struct vc_data *vc)
879 {
880 WARN_CONSOLE_UNLOCKED();
881
882 if (vc->vc_sw->con_save_screen)
883 vc->vc_sw->con_save_screen(vc);
884 }
885
886 static void flush_scrollback(struct vc_data *vc)
887 {
888 WARN_CONSOLE_UNLOCKED();
889
890 set_origin(vc);
891 if (!con_is_visible(vc))
892 return;
893
894 /*
895 * The legacy way for flushing the scrollback buffer is to use a side
896 * effect of the con_switch method. We do it only on the foreground
897 * console as background consoles have no scrollback buffers in that
898 * case and we obviously don't want to switch to them.
899 */
900 hide_cursor(vc);
901 vc->vc_sw->con_switch(vc);
902 set_cursor(vc);
903 }
904
905 /*
906 * Redrawing of screen
907 */
908
909 void clear_buffer_attributes(struct vc_data *vc)
910 {
911 unsigned short *p = (unsigned short *)vc->vc_origin;
912 int count = vc->vc_screenbuf_size / 2;
913 int mask = vc->vc_hi_font_mask | 0xff;
914
915 for (; count > 0; count--, p++) {
916 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
917 }
918 }
919
920 void redraw_screen(struct vc_data *vc, int is_switch)
921 {
922 int redraw = 0;
923
924 WARN_CONSOLE_UNLOCKED();
925
926 if (!vc) {
927 /* strange ... */
928 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
929 return;
930 }
931
932 if (is_switch) {
933 struct vc_data *old_vc = vc_cons[fg_console].d;
934 if (old_vc == vc)
935 return;
936 if (!con_is_visible(vc))
937 redraw = 1;
938 *vc->vc_display_fg = vc;
939 fg_console = vc->vc_num;
940 hide_cursor(old_vc);
941 if (!con_is_visible(old_vc)) {
942 save_screen(old_vc);
943 set_origin(old_vc);
944 }
945 if (tty0dev)
946 sysfs_notify(&tty0dev->kobj, NULL, "active");
947 } else {
948 hide_cursor(vc);
949 redraw = 1;
950 }
951
952 if (redraw) {
953 bool update;
954 int old_was_color = vc->vc_can_do_color;
955
956 set_origin(vc);
957 update = vc->vc_sw->con_switch(vc);
958 set_palette(vc);
959 /*
960 * If console changed from mono<->color, the best we can do
961 * is to clear the buffer attributes. As it currently stands,
962 * rebuilding new attributes from the old buffer is not doable
963 * without overly complex code.
964 */
965 if (old_was_color != vc->vc_can_do_color) {
966 update_attr(vc);
967 clear_buffer_attributes(vc);
968 }
969
970 if (update && vc->vc_mode != KD_GRAPHICS)
971 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
972 }
973 set_cursor(vc);
974 if (is_switch) {
975 vt_set_leds_compute_shiftstate();
976 notify_update(vc);
977 }
978 }
979 EXPORT_SYMBOL(redraw_screen);
980
981 /*
982 * Allocation, freeing and resizing of VTs.
983 */
984
985 int vc_cons_allocated(unsigned int i)
986 {
987 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
988 }
989
990 static void visual_init(struct vc_data *vc, int num, bool init)
991 {
992 /* ++Geert: vc->vc_sw->con_init determines console size */
993 if (vc->vc_sw)
994 module_put(vc->vc_sw->owner);
995 vc->vc_sw = conswitchp;
996
997 if (con_driver_map[num])
998 vc->vc_sw = con_driver_map[num];
999
1000 __module_get(vc->vc_sw->owner);
1001 vc->vc_num = num;
1002 vc->vc_display_fg = &master_display_fg;
1003 if (vc->uni_pagedict_loc)
1004 con_free_unimap(vc);
1005 vc->uni_pagedict_loc = &vc->uni_pagedict;
1006 vc->uni_pagedict = NULL;
1007 vc->vc_hi_font_mask = 0;
1008 vc->vc_complement_mask = 0;
1009 vc->vc_can_do_color = 0;
1010 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1011 vc->vc_sw->con_init(vc, init);
1012 if (!vc->vc_complement_mask)
1013 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1014 vc->vc_s_complement_mask = vc->vc_complement_mask;
1015 vc->vc_size_row = vc->vc_cols << 1;
1016 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1017 }
1018
1019
1020 static void visual_deinit(struct vc_data *vc)
1021 {
1022 vc->vc_sw->con_deinit(vc);
1023 module_put(vc->vc_sw->owner);
1024 }
1025
1026 static void vc_port_destruct(struct tty_port *port)
1027 {
1028 struct vc_data *vc = container_of(port, struct vc_data, port);
1029
1030 kfree(vc);
1031 }
1032
1033 static const struct tty_port_operations vc_port_ops = {
1034 .destruct = vc_port_destruct,
1035 };
1036
1037 /*
1038 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1039 * [this is to be used together with some user program
1040 * like resize that changes the hardware videomode]
1041 */
1042 #define VC_MAXCOL (32767)
1043 #define VC_MAXROW (32767)
1044
1045 int vc_allocate(unsigned int currcons) /* return 0 on success */
1046 {
1047 struct vt_notifier_param param;
1048 struct vc_data *vc;
1049 int err;
1050
1051 WARN_CONSOLE_UNLOCKED();
1052
1053 if (currcons >= MAX_NR_CONSOLES)
1054 return -ENXIO;
1055
1056 if (vc_cons[currcons].d)
1057 return 0;
1058
1059 /* due to the granularity of kmalloc, we waste some memory here */
1060 /* the alloc is done in two steps, to optimize the common situation
1061 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1062 /* although the numbers above are not valid since long ago, the
1063 point is still up-to-date and the comment still has its value
1064 even if only as a historical artifact. --mj, July 1998 */
1065 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1066 if (!vc)
1067 return -ENOMEM;
1068
1069 vc_cons[currcons].d = vc;
1070 tty_port_init(&vc->port);
1071 vc->port.ops = &vc_port_ops;
1072 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1073
1074 visual_init(vc, currcons, true);
1075
1076 if (!*vc->uni_pagedict_loc)
1077 con_set_default_unimap(vc);
1078
1079 err = -EINVAL;
1080 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1081 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1082 goto err_free;
1083 err = -ENOMEM;
1084 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1085 if (!vc->vc_screenbuf)
1086 goto err_free;
1087
1088 /* If no drivers have overridden us and the user didn't pass a
1089 boot option, default to displaying the cursor */
1090 if (global_cursor_default == -1)
1091 global_cursor_default = 1;
1092
1093 vc_init(vc, 1);
1094 vcs_make_sysfs(currcons);
1095 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1096
1097 return 0;
1098 err_free:
1099 visual_deinit(vc);
1100 kfree(vc);
1101 vc_cons[currcons].d = NULL;
1102 return err;
1103 }
1104
1105 static inline int resize_screen(struct vc_data *vc, int width, int height,
1106 bool from_user)
1107 {
1108 /* Resizes the resolution of the display adapater */
1109 int err = 0;
1110
1111 if (vc->vc_sw->con_resize)
1112 err = vc->vc_sw->con_resize(vc, width, height, from_user);
1113
1114 return err;
1115 }
1116
1117 /**
1118 * vc_do_resize - resizing method for the tty
1119 * @tty: tty being resized
1120 * @vc: virtual console private data
1121 * @cols: columns
1122 * @lines: lines
1123 * @from_user: invoked by a user?
1124 *
1125 * Resize a virtual console, clipping according to the actual constraints. If
1126 * the caller passes a tty structure then update the termios winsize
1127 * information and perform any necessary signal handling.
1128 *
1129 * Locking: Caller must hold the console semaphore. Takes the termios rwsem and
1130 * ctrl.lock of the tty IFF a tty is passed.
1131 */
1132 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1133 unsigned int cols, unsigned int lines, bool from_user)
1134 {
1135 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1136 unsigned long end;
1137 unsigned int old_rows, old_row_size, first_copied_row;
1138 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1139 unsigned short *oldscreen, *newscreen;
1140 u32 **new_uniscr = NULL;
1141
1142 WARN_CONSOLE_UNLOCKED();
1143
1144 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1145 return -EINVAL;
1146
1147 new_cols = (cols ? cols : vc->vc_cols);
1148 new_rows = (lines ? lines : vc->vc_rows);
1149 new_row_size = new_cols << 1;
1150 new_screen_size = new_row_size * new_rows;
1151
1152 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1153 /*
1154 * This function is being called here to cover the case
1155 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1156 * passing the same fb_var_screeninfo containing the fields
1157 * yres/xres equal to a number non-multiple of vc_font.height
1158 * and yres_virtual/xres_virtual equal to number lesser than the
1159 * vc_font.height and yres/xres.
1160 * In the second call, the struct fb_var_screeninfo isn't
1161 * being modified by the underlying driver because of the
1162 * if above, and this causes the fbcon_display->vrows to become
1163 * negative and it eventually leads to out-of-bound
1164 * access by the imageblit function.
1165 * To give the correct values to the struct and to not have
1166 * to deal with possible errors from the code below, we call
1167 * the resize_screen here as well.
1168 */
1169 return resize_screen(vc, new_cols, new_rows, from_user);
1170 }
1171
1172 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1173 return -EINVAL;
1174 newscreen = kzalloc(new_screen_size, GFP_USER);
1175 if (!newscreen)
1176 return -ENOMEM;
1177
1178 if (vc->vc_uni_lines) {
1179 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1180 if (!new_uniscr) {
1181 kfree(newscreen);
1182 return -ENOMEM;
1183 }
1184 }
1185
1186 if (vc_is_sel(vc))
1187 clear_selection();
1188
1189 old_rows = vc->vc_rows;
1190 old_row_size = vc->vc_size_row;
1191
1192 err = resize_screen(vc, new_cols, new_rows, from_user);
1193 if (err) {
1194 kfree(newscreen);
1195 vc_uniscr_free(new_uniscr);
1196 return err;
1197 }
1198
1199 vc->vc_rows = new_rows;
1200 vc->vc_cols = new_cols;
1201 vc->vc_size_row = new_row_size;
1202 vc->vc_screenbuf_size = new_screen_size;
1203
1204 rlth = min(old_row_size, new_row_size);
1205 rrem = new_row_size - rlth;
1206 old_origin = vc->vc_origin;
1207 new_origin = (long) newscreen;
1208 new_scr_end = new_origin + new_screen_size;
1209
1210 if (vc->state.y > new_rows) {
1211 if (old_rows - vc->state.y < new_rows) {
1212 /*
1213 * Cursor near the bottom, copy contents from the
1214 * bottom of buffer
1215 */
1216 first_copied_row = (old_rows - new_rows);
1217 } else {
1218 /*
1219 * Cursor is in no man's land, copy 1/2 screenful
1220 * from the top and bottom of cursor position
1221 */
1222 first_copied_row = (vc->state.y - new_rows/2);
1223 }
1224 old_origin += first_copied_row * old_row_size;
1225 } else
1226 first_copied_row = 0;
1227 end = old_origin + old_row_size * min(old_rows, new_rows);
1228
1229 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1230 vc->vc_uni_lines, rlth/2, first_copied_row,
1231 min(old_rows, new_rows));
1232 vc_uniscr_set(vc, new_uniscr);
1233
1234 update_attr(vc);
1235
1236 while (old_origin < end) {
1237 scr_memcpyw((unsigned short *) new_origin,
1238 (unsigned short *) old_origin, rlth);
1239 if (rrem)
1240 scr_memsetw((void *)(new_origin + rlth),
1241 vc->vc_video_erase_char, rrem);
1242 old_origin += old_row_size;
1243 new_origin += new_row_size;
1244 }
1245 if (new_scr_end > new_origin)
1246 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1247 new_scr_end - new_origin);
1248 oldscreen = vc->vc_screenbuf;
1249 vc->vc_screenbuf = newscreen;
1250 vc->vc_screenbuf_size = new_screen_size;
1251 set_origin(vc);
1252 kfree(oldscreen);
1253
1254 /* do part of a reset_terminal() */
1255 vc->vc_top = 0;
1256 vc->vc_bottom = vc->vc_rows;
1257 gotoxy(vc, vc->state.x, vc->state.y);
1258 save_cur(vc);
1259
1260 if (tty) {
1261 /* Rewrite the requested winsize data with the actual
1262 resulting sizes */
1263 struct winsize ws;
1264 memset(&ws, 0, sizeof(ws));
1265 ws.ws_row = vc->vc_rows;
1266 ws.ws_col = vc->vc_cols;
1267 ws.ws_ypixel = vc->vc_scan_lines;
1268 tty_do_resize(tty, &ws);
1269 }
1270
1271 if (con_is_visible(vc))
1272 update_screen(vc);
1273 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1274 notify_update(vc);
1275 return err;
1276 }
1277
1278 /**
1279 * __vc_resize - resize a VT
1280 * @vc: virtual console
1281 * @cols: columns
1282 * @rows: rows
1283 * @from_user: invoked by a user?
1284 *
1285 * Resize a virtual console as seen from the console end of things. We use the
1286 * common vc_do_resize() method to update the structures.
1287 *
1288 * Locking: The caller must hold the console sem to protect console internals
1289 * and @vc->port.tty.
1290 */
1291 int __vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows,
1292 bool from_user)
1293 {
1294 return vc_do_resize(vc->port.tty, vc, cols, rows, from_user);
1295 }
1296 EXPORT_SYMBOL(__vc_resize);
1297
1298 /**
1299 * vt_resize - resize a VT
1300 * @tty: tty to resize
1301 * @ws: winsize attributes
1302 *
1303 * Resize a virtual terminal. This is called by the tty layer as we register
1304 * our own handler for resizing. The mutual helper does all the actual work.
1305 *
1306 * Locking: Takes the console sem and the called methods then take the tty
1307 * termios_rwsem and the tty ctrl.lock in that order.
1308 */
1309 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1310 {
1311 struct vc_data *vc = tty->driver_data;
1312 int ret;
1313
1314 console_lock();
1315 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row, false);
1316 console_unlock();
1317 return ret;
1318 }
1319
1320 struct vc_data *vc_deallocate(unsigned int currcons)
1321 {
1322 struct vc_data *vc = NULL;
1323
1324 WARN_CONSOLE_UNLOCKED();
1325
1326 if (vc_cons_allocated(currcons)) {
1327 struct vt_notifier_param param;
1328
1329 param.vc = vc = vc_cons[currcons].d;
1330 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1331 vcs_remove_sysfs(currcons);
1332 visual_deinit(vc);
1333 con_free_unimap(vc);
1334 put_pid(vc->vt_pid);
1335 vc_uniscr_set(vc, NULL);
1336 kfree(vc->vc_screenbuf);
1337 vc_cons[currcons].d = NULL;
1338 }
1339 return vc;
1340 }
1341
1342 /*
1343 * VT102 emulator
1344 */
1345
1346 enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1347
1348 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1349 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1350 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1351
1352 #define decarm VC_REPEAT
1353 #define decckm VC_CKMODE
1354 #define kbdapplic VC_APPLIC
1355 #define lnm VC_CRLF
1356
1357 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1358 8,12,10,14, 9,13,11,15 };
1359 EXPORT_SYMBOL(color_table);
1360
1361 /* the default colour table, for VGA+ colour systems */
1362 unsigned char default_red[] = {
1363 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1364 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1365 };
1366 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1367 EXPORT_SYMBOL(default_red);
1368
1369 unsigned char default_grn[] = {
1370 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1371 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1372 };
1373 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1374 EXPORT_SYMBOL(default_grn);
1375
1376 unsigned char default_blu[] = {
1377 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1378 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1379 };
1380 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1381 EXPORT_SYMBOL(default_blu);
1382
1383 /*
1384 * gotoxy() must verify all boundaries, because the arguments
1385 * might also be negative. If the given position is out of
1386 * bounds, the cursor is placed at the nearest margin.
1387 */
1388 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1389 {
1390 int min_y, max_y;
1391
1392 if (new_x < 0)
1393 vc->state.x = 0;
1394 else {
1395 if (new_x >= vc->vc_cols)
1396 vc->state.x = vc->vc_cols - 1;
1397 else
1398 vc->state.x = new_x;
1399 }
1400
1401 if (vc->vc_decom) {
1402 min_y = vc->vc_top;
1403 max_y = vc->vc_bottom;
1404 } else {
1405 min_y = 0;
1406 max_y = vc->vc_rows;
1407 }
1408 if (new_y < min_y)
1409 vc->state.y = min_y;
1410 else if (new_y >= max_y)
1411 vc->state.y = max_y - 1;
1412 else
1413 vc->state.y = new_y;
1414 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1415 (vc->state.x << 1);
1416 vc->vc_need_wrap = 0;
1417 }
1418
1419 /* for absolute user moves, when decom is set */
1420 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1421 {
1422 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1423 }
1424
1425 void scrollback(struct vc_data *vc)
1426 {
1427 scrolldelta(-(vc->vc_rows / 2));
1428 }
1429
1430 void scrollfront(struct vc_data *vc, int lines)
1431 {
1432 if (!lines)
1433 lines = vc->vc_rows / 2;
1434 scrolldelta(lines);
1435 }
1436
1437 static void lf(struct vc_data *vc)
1438 {
1439 /* don't scroll if above bottom of scrolling region, or
1440 * if below scrolling region
1441 */
1442 if (vc->state.y + 1 == vc->vc_bottom)
1443 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1444 else if (vc->state.y < vc->vc_rows - 1) {
1445 vc->state.y++;
1446 vc->vc_pos += vc->vc_size_row;
1447 }
1448 vc->vc_need_wrap = 0;
1449 notify_write(vc, '\n');
1450 }
1451
1452 static void ri(struct vc_data *vc)
1453 {
1454 /* don't scroll if below top of scrolling region, or
1455 * if above scrolling region
1456 */
1457 if (vc->state.y == vc->vc_top)
1458 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1459 else if (vc->state.y > 0) {
1460 vc->state.y--;
1461 vc->vc_pos -= vc->vc_size_row;
1462 }
1463 vc->vc_need_wrap = 0;
1464 }
1465
1466 static inline void cr(struct vc_data *vc)
1467 {
1468 vc->vc_pos -= vc->state.x << 1;
1469 vc->vc_need_wrap = vc->state.x = 0;
1470 notify_write(vc, '\r');
1471 }
1472
1473 static inline void bs(struct vc_data *vc)
1474 {
1475 if (vc->state.x) {
1476 vc->vc_pos -= 2;
1477 vc->state.x--;
1478 vc->vc_need_wrap = 0;
1479 notify_write(vc, '\b');
1480 }
1481 }
1482
1483 static inline void del(struct vc_data *vc)
1484 {
1485 /* ignored */
1486 }
1487
1488 enum CSI_J {
1489 CSI_J_CURSOR_TO_END = 0,
1490 CSI_J_START_TO_CURSOR = 1,
1491 CSI_J_VISIBLE = 2,
1492 CSI_J_FULL = 3,
1493 };
1494
1495 static void csi_J(struct vc_data *vc, enum CSI_J vpar)
1496 {
1497 unsigned short *start;
1498 unsigned int count;
1499
1500 switch (vpar) {
1501 case CSI_J_CURSOR_TO_END:
1502 vc_uniscr_clear_line(vc, vc->state.x,
1503 vc->vc_cols - vc->state.x);
1504 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1505 vc->vc_rows - vc->state.y - 1);
1506 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1507 start = (unsigned short *)vc->vc_pos;
1508 break;
1509 case CSI_J_START_TO_CURSOR:
1510 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1511 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1512 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1513 start = (unsigned short *)vc->vc_origin;
1514 break;
1515 case CSI_J_FULL:
1516 flush_scrollback(vc);
1517 fallthrough;
1518 case CSI_J_VISIBLE:
1519 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1520 count = vc->vc_cols * vc->vc_rows;
1521 start = (unsigned short *)vc->vc_origin;
1522 break;
1523 default:
1524 return;
1525 }
1526 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1527 if (con_should_update(vc))
1528 do_update_region(vc, (unsigned long) start, count);
1529 vc->vc_need_wrap = 0;
1530 }
1531
1532 enum {
1533 CSI_K_CURSOR_TO_LINEEND = 0,
1534 CSI_K_LINESTART_TO_CURSOR = 1,
1535 CSI_K_LINE = 2,
1536 };
1537
1538 static void csi_K(struct vc_data *vc)
1539 {
1540 unsigned int count;
1541 unsigned short *start = (unsigned short *)vc->vc_pos;
1542 int offset;
1543
1544 switch (vc->vc_par[0]) {
1545 case CSI_K_CURSOR_TO_LINEEND:
1546 offset = 0;
1547 count = vc->vc_cols - vc->state.x;
1548 break;
1549 case CSI_K_LINESTART_TO_CURSOR:
1550 offset = -vc->state.x;
1551 count = vc->state.x + 1;
1552 break;
1553 case CSI_K_LINE:
1554 offset = -vc->state.x;
1555 count = vc->vc_cols;
1556 break;
1557 default:
1558 return;
1559 }
1560 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
1561 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1562 vc->vc_need_wrap = 0;
1563 if (con_should_update(vc))
1564 do_update_region(vc, (unsigned long)(start + offset), count);
1565 }
1566
1567 /* erase the following count positions */
1568 static void csi_X(struct vc_data *vc)
1569 { /* not vt100? */
1570 unsigned int count = clamp(vc->vc_par[0], 1, vc->vc_cols - vc->state.x);
1571
1572 vc_uniscr_clear_line(vc, vc->state.x, count);
1573 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1574 if (con_should_update(vc))
1575 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, count);
1576 vc->vc_need_wrap = 0;
1577 }
1578
1579 static void default_attr(struct vc_data *vc)
1580 {
1581 vc->state.intensity = VCI_NORMAL;
1582 vc->state.italic = false;
1583 vc->state.underline = false;
1584 vc->state.reverse = false;
1585 vc->state.blink = false;
1586 vc->state.color = vc->vc_def_color;
1587 }
1588
1589 struct rgb { u8 r; u8 g; u8 b; };
1590
1591 static void rgb_from_256(unsigned int i, struct rgb *c)
1592 {
1593 if (i < 8) { /* Standard colours. */
1594 c->r = i&1 ? 0xaa : 0x00;
1595 c->g = i&2 ? 0xaa : 0x00;
1596 c->b = i&4 ? 0xaa : 0x00;
1597 } else if (i < 16) {
1598 c->r = i&1 ? 0xff : 0x55;
1599 c->g = i&2 ? 0xff : 0x55;
1600 c->b = i&4 ? 0xff : 0x55;
1601 } else if (i < 232) { /* 6x6x6 colour cube. */
1602 i -= 16;
1603 c->b = i % 6 * 255 / 6;
1604 i /= 6;
1605 c->g = i % 6 * 255 / 6;
1606 i /= 6;
1607 c->r = i * 255 / 6;
1608 } else /* Grayscale ramp. */
1609 c->r = c->g = c->b = i * 10 - 2312;
1610 }
1611
1612 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1613 {
1614 u8 hue = 0, max = max3(c->r, c->g, c->b);
1615
1616 if (c->r > max / 2)
1617 hue |= 4;
1618 if (c->g > max / 2)
1619 hue |= 2;
1620 if (c->b > max / 2)
1621 hue |= 1;
1622
1623 if (hue == 7 && max <= 0x55) {
1624 hue = 0;
1625 vc->state.intensity = VCI_BOLD;
1626 } else if (max > 0xaa)
1627 vc->state.intensity = VCI_BOLD;
1628 else
1629 vc->state.intensity = VCI_NORMAL;
1630
1631 vc->state.color = (vc->state.color & 0xf0) | hue;
1632 }
1633
1634 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1635 {
1636 /* For backgrounds, err on the dark side. */
1637 vc->state.color = (vc->state.color & 0x0f)
1638 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1639 }
1640
1641 /*
1642 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1643 * and thus need to be detected and ignored by hand. That standard also
1644 * wants : rather than ; as separators but sequences containing : are currently
1645 * completely ignored by the parser.
1646 *
1647 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1648 * supporting them.
1649 */
1650 static int vc_t416_color(struct vc_data *vc, int i,
1651 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1652 {
1653 struct rgb c;
1654
1655 i++;
1656 if (i > vc->vc_npar)
1657 return i;
1658
1659 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1660 /* 256 colours */
1661 i++;
1662 rgb_from_256(vc->vc_par[i], &c);
1663 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1664 /* 24 bit */
1665 c.r = vc->vc_par[i + 1];
1666 c.g = vc->vc_par[i + 2];
1667 c.b = vc->vc_par[i + 3];
1668 i += 3;
1669 } else
1670 return i;
1671
1672 set_color(vc, &c);
1673
1674 return i;
1675 }
1676
1677 enum {
1678 CSI_m_DEFAULT = 0,
1679 CSI_m_BOLD = 1,
1680 CSI_m_HALF_BRIGHT = 2,
1681 CSI_m_ITALIC = 3,
1682 CSI_m_UNDERLINE = 4,
1683 CSI_m_BLINK = 5,
1684 CSI_m_REVERSE = 7,
1685 CSI_m_PRI_FONT = 10,
1686 CSI_m_ALT_FONT1 = 11,
1687 CSI_m_ALT_FONT2 = 12,
1688 CSI_m_DOUBLE_UNDERLINE = 21,
1689 CSI_m_NORMAL_INTENSITY = 22,
1690 CSI_m_NO_ITALIC = 23,
1691 CSI_m_NO_UNDERLINE = 24,
1692 CSI_m_NO_BLINK = 25,
1693 CSI_m_NO_REVERSE = 27,
1694 CSI_m_FG_COLOR_BEG = 30,
1695 CSI_m_FG_COLOR_END = 37,
1696 CSI_m_FG_COLOR = 38,
1697 CSI_m_DEFAULT_FG_COLOR = 39,
1698 CSI_m_BG_COLOR_BEG = 40,
1699 CSI_m_BG_COLOR_END = 47,
1700 CSI_m_BG_COLOR = 48,
1701 CSI_m_DEFAULT_BG_COLOR = 49,
1702 CSI_m_BRIGHT_FG_COLOR_BEG = 90,
1703 CSI_m_BRIGHT_FG_COLOR_END = 97,
1704 CSI_m_BRIGHT_FG_COLOR_OFF = CSI_m_BRIGHT_FG_COLOR_BEG - CSI_m_FG_COLOR_BEG,
1705 CSI_m_BRIGHT_BG_COLOR_BEG = 100,
1706 CSI_m_BRIGHT_BG_COLOR_END = 107,
1707 CSI_m_BRIGHT_BG_COLOR_OFF = CSI_m_BRIGHT_BG_COLOR_BEG - CSI_m_BG_COLOR_BEG,
1708 };
1709
1710 /* console_lock is held */
1711 static void csi_m(struct vc_data *vc)
1712 {
1713 int i;
1714
1715 for (i = 0; i <= vc->vc_npar; i++)
1716 switch (vc->vc_par[i]) {
1717 case CSI_m_DEFAULT: /* all attributes off */
1718 default_attr(vc);
1719 break;
1720 case CSI_m_BOLD:
1721 vc->state.intensity = VCI_BOLD;
1722 break;
1723 case CSI_m_HALF_BRIGHT:
1724 vc->state.intensity = VCI_HALF_BRIGHT;
1725 break;
1726 case CSI_m_ITALIC:
1727 vc->state.italic = true;
1728 break;
1729 case CSI_m_DOUBLE_UNDERLINE:
1730 /*
1731 * No console drivers support double underline, so
1732 * convert it to a single underline.
1733 */
1734 case CSI_m_UNDERLINE:
1735 vc->state.underline = true;
1736 break;
1737 case CSI_m_BLINK:
1738 vc->state.blink = true;
1739 break;
1740 case CSI_m_REVERSE:
1741 vc->state.reverse = true;
1742 break;
1743 case CSI_m_PRI_FONT: /* ANSI X3.64-1979 (SCO-ish?)
1744 * Select primary font, don't display control chars if
1745 * defined, don't set bit 8 on output.
1746 */
1747 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
1748 vc->vc_disp_ctrl = 0;
1749 vc->vc_toggle_meta = 0;
1750 break;
1751 case CSI_m_ALT_FONT1: /* ANSI X3.64-1979 (SCO-ish?)
1752 * Select first alternate font, lets chars < 32 be
1753 * displayed as ROM chars.
1754 */
1755 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1756 vc->vc_disp_ctrl = 1;
1757 vc->vc_toggle_meta = 0;
1758 break;
1759 case CSI_m_ALT_FONT2: /* ANSI X3.64-1979 (SCO-ish?)
1760 * Select second alternate font, toggle high bit
1761 * before displaying as ROM char.
1762 */
1763 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1764 vc->vc_disp_ctrl = 1;
1765 vc->vc_toggle_meta = 1;
1766 break;
1767 case CSI_m_NORMAL_INTENSITY:
1768 vc->state.intensity = VCI_NORMAL;
1769 break;
1770 case CSI_m_NO_ITALIC:
1771 vc->state.italic = false;
1772 break;
1773 case CSI_m_NO_UNDERLINE:
1774 vc->state.underline = false;
1775 break;
1776 case CSI_m_NO_BLINK:
1777 vc->state.blink = false;
1778 break;
1779 case CSI_m_NO_REVERSE:
1780 vc->state.reverse = false;
1781 break;
1782 case CSI_m_FG_COLOR:
1783 i = vc_t416_color(vc, i, rgb_foreground);
1784 break;
1785 case CSI_m_BG_COLOR:
1786 i = vc_t416_color(vc, i, rgb_background);
1787 break;
1788 case CSI_m_DEFAULT_FG_COLOR:
1789 vc->state.color = (vc->vc_def_color & 0x0f) |
1790 (vc->state.color & 0xf0);
1791 break;
1792 case CSI_m_DEFAULT_BG_COLOR:
1793 vc->state.color = (vc->vc_def_color & 0xf0) |
1794 (vc->state.color & 0x0f);
1795 break;
1796 case CSI_m_BRIGHT_FG_COLOR_BEG ... CSI_m_BRIGHT_FG_COLOR_END:
1797 vc->state.intensity = VCI_BOLD;
1798 vc->vc_par[i] -= CSI_m_BRIGHT_FG_COLOR_OFF;
1799 fallthrough;
1800 case CSI_m_FG_COLOR_BEG ... CSI_m_FG_COLOR_END:
1801 vc->vc_par[i] -= CSI_m_FG_COLOR_BEG;
1802 vc->state.color = color_table[vc->vc_par[i]] |
1803 (vc->state.color & 0xf0);
1804 break;
1805 case CSI_m_BRIGHT_BG_COLOR_BEG ... CSI_m_BRIGHT_BG_COLOR_END:
1806 vc->vc_par[i] -= CSI_m_BRIGHT_BG_COLOR_OFF;
1807 fallthrough;
1808 case CSI_m_BG_COLOR_BEG ... CSI_m_BG_COLOR_END:
1809 vc->vc_par[i] -= CSI_m_BG_COLOR_BEG;
1810 vc->state.color = (color_table[vc->vc_par[i]] << 4) |
1811 (vc->state.color & 0x0f);
1812 break;
1813 }
1814 update_attr(vc);
1815 }
1816
1817 static void respond_string(const char *p, size_t len, struct tty_port *port)
1818 {
1819 tty_insert_flip_string(port, p, len);
1820 tty_flip_buffer_push(port);
1821 }
1822
1823 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1824 {
1825 char buf[40];
1826 int len;
1827
1828 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1829 (vc->vc_decom ? vc->vc_top + 1 : 1),
1830 vc->state.x + 1);
1831 respond_string(buf, len, tty->port);
1832 }
1833
1834 static inline void status_report(struct tty_struct *tty)
1835 {
1836 static const char teminal_ok[] = "\033[0n";
1837
1838 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1839 }
1840
1841 static inline void respond_ID(struct tty_struct *tty)
1842 {
1843 /* terminal answer to an ESC-Z or csi0c query. */
1844 static const char vt102_id[] = "\033[?6c";
1845
1846 respond_string(vt102_id, strlen(vt102_id), tty->port);
1847 }
1848
1849 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1850 {
1851 char buf[8];
1852 int len;
1853
1854 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1855 (char)('!' + mrx), (char)('!' + mry));
1856 respond_string(buf, len, tty->port);
1857 }
1858
1859 /* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1860 int mouse_reporting(void)
1861 {
1862 return vc_cons[fg_console].d->vc_report_mouse;
1863 }
1864
1865 enum {
1866 CSI_DEC_hl_CURSOR_KEYS = 1, /* CKM: cursor keys send ^[Ox/^[[x */
1867 CSI_DEC_hl_132_COLUMNS = 3, /* COLM: 80/132 mode switch */
1868 CSI_DEC_hl_REVERSE_VIDEO = 5, /* SCNM */
1869 CSI_DEC_hl_ORIGIN_MODE = 6, /* OM: origin relative/absolute */
1870 CSI_DEC_hl_AUTOWRAP = 7, /* AWM */
1871 CSI_DEC_hl_AUTOREPEAT = 8, /* ARM */
1872 CSI_DEC_hl_MOUSE_X10 = 9,
1873 CSI_DEC_hl_SHOW_CURSOR = 25, /* TCEM */
1874 CSI_DEC_hl_MOUSE_VT200 = 1000,
1875 };
1876
1877 /* console_lock is held */
1878 static void csi_DEC_hl(struct vc_data *vc, bool on_off)
1879 {
1880 unsigned int i;
1881
1882 for (i = 0; i <= vc->vc_npar; i++)
1883 switch (vc->vc_par[i]) {
1884 case CSI_DEC_hl_CURSOR_KEYS:
1885 if (on_off)
1886 set_kbd(vc, decckm);
1887 else
1888 clr_kbd(vc, decckm);
1889 break;
1890 case CSI_DEC_hl_132_COLUMNS: /* unimplemented */
1891 #if 0
1892 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1893 /* this alone does not suffice; some user mode
1894 utility has to change the hardware regs */
1895 #endif
1896 break;
1897 case CSI_DEC_hl_REVERSE_VIDEO:
1898 if (vc->vc_decscnm != on_off) {
1899 vc->vc_decscnm = on_off;
1900 invert_screen(vc, 0, vc->vc_screenbuf_size,
1901 false);
1902 update_attr(vc);
1903 }
1904 break;
1905 case CSI_DEC_hl_ORIGIN_MODE:
1906 vc->vc_decom = on_off;
1907 gotoxay(vc, 0, 0);
1908 break;
1909 case CSI_DEC_hl_AUTOWRAP:
1910 vc->vc_decawm = on_off;
1911 break;
1912 case CSI_DEC_hl_AUTOREPEAT:
1913 if (on_off)
1914 set_kbd(vc, decarm);
1915 else
1916 clr_kbd(vc, decarm);
1917 break;
1918 case CSI_DEC_hl_MOUSE_X10:
1919 vc->vc_report_mouse = on_off ? 1 : 0;
1920 break;
1921 case CSI_DEC_hl_SHOW_CURSOR:
1922 vc->vc_deccm = on_off;
1923 break;
1924 case CSI_DEC_hl_MOUSE_VT200:
1925 vc->vc_report_mouse = on_off ? 2 : 0;
1926 break;
1927 }
1928 }
1929
1930 enum {
1931 CSI_hl_DISPLAY_CTRL = 3, /* handle ansi control chars */
1932 CSI_hl_INSERT = 4, /* IRM: insert/replace */
1933 CSI_hl_AUTO_NL = 20, /* LNM: Enter == CrLf/Lf */
1934 };
1935
1936 /* console_lock is held */
1937 static void csi_hl(struct vc_data *vc, bool on_off)
1938 {
1939 unsigned int i;
1940
1941 for (i = 0; i <= vc->vc_npar; i++)
1942 switch (vc->vc_par[i]) { /* ANSI modes set/reset */
1943 case CSI_hl_DISPLAY_CTRL:
1944 vc->vc_disp_ctrl = on_off;
1945 break;
1946 case CSI_hl_INSERT:
1947 vc->vc_decim = on_off;
1948 break;
1949 case CSI_hl_AUTO_NL:
1950 if (on_off)
1951 set_kbd(vc, lnm);
1952 else
1953 clr_kbd(vc, lnm);
1954 break;
1955 }
1956 }
1957
1958 enum CSI_right_square_bracket {
1959 CSI_RSB_COLOR_FOR_UNDERLINE = 1,
1960 CSI_RSB_COLOR_FOR_HALF_BRIGHT = 2,
1961 CSI_RSB_MAKE_CUR_COLOR_DEFAULT = 8,
1962 CSI_RSB_BLANKING_INTERVAL = 9,
1963 CSI_RSB_BELL_FREQUENCY = 10,
1964 CSI_RSB_BELL_DURATION = 11,
1965 CSI_RSB_BRING_CONSOLE_TO_FRONT = 12,
1966 CSI_RSB_UNBLANK = 13,
1967 CSI_RSB_VESA_OFF_INTERVAL = 14,
1968 CSI_RSB_BRING_PREV_CONSOLE_TO_FRONT = 15,
1969 CSI_RSB_CURSOR_BLINK_INTERVAL = 16,
1970 };
1971
1972 /*
1973 * csi_RSB - csi+] (Right Square Bracket) handler
1974 *
1975 * These are linux console private sequences.
1976 *
1977 * console_lock is held
1978 */
1979 static void csi_RSB(struct vc_data *vc)
1980 {
1981 switch (vc->vc_par[0]) {
1982 case CSI_RSB_COLOR_FOR_UNDERLINE:
1983 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1984 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1985 if (vc->state.underline)
1986 update_attr(vc);
1987 }
1988 break;
1989 case CSI_RSB_COLOR_FOR_HALF_BRIGHT:
1990 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1991 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1992 if (vc->state.intensity == VCI_HALF_BRIGHT)
1993 update_attr(vc);
1994 }
1995 break;
1996 case CSI_RSB_MAKE_CUR_COLOR_DEFAULT:
1997 vc->vc_def_color = vc->vc_attr;
1998 if (vc->vc_hi_font_mask == 0x100)
1999 vc->vc_def_color >>= 1;
2000 default_attr(vc);
2001 update_attr(vc);
2002 break;
2003 case CSI_RSB_BLANKING_INTERVAL:
2004 blankinterval = min(vc->vc_par[1], 60U) * 60;
2005 poke_blanked_console();
2006 break;
2007 case CSI_RSB_BELL_FREQUENCY:
2008 if (vc->vc_npar >= 1)
2009 vc->vc_bell_pitch = vc->vc_par[1];
2010 else
2011 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2012 break;
2013 case CSI_RSB_BELL_DURATION:
2014 if (vc->vc_npar >= 1)
2015 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
2016 msecs_to_jiffies(vc->vc_par[1]) : 0;
2017 else
2018 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2019 break;
2020 case CSI_RSB_BRING_CONSOLE_TO_FRONT:
2021 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
2022 set_console(vc->vc_par[1] - 1);
2023 break;
2024 case CSI_RSB_UNBLANK:
2025 poke_blanked_console();
2026 break;
2027 case CSI_RSB_VESA_OFF_INTERVAL:
2028 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
2029 break;
2030 case CSI_RSB_BRING_PREV_CONSOLE_TO_FRONT:
2031 set_console(last_console);
2032 break;
2033 case CSI_RSB_CURSOR_BLINK_INTERVAL:
2034 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
2035 vc->vc_par[1] <= USHRT_MAX)
2036 vc->vc_cur_blink_ms = vc->vc_par[1];
2037 else
2038 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2039 break;
2040 }
2041 }
2042
2043 /* console_lock is held */
2044 static void csi_at(struct vc_data *vc, unsigned int nr)
2045 {
2046 nr = clamp(nr, 1, vc->vc_cols - vc->state.x);
2047 insert_char(vc, nr);
2048 }
2049
2050 /* console_lock is held */
2051 static void csi_L(struct vc_data *vc)
2052 {
2053 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_rows - vc->state.y);
2054
2055 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
2056 vc->vc_need_wrap = 0;
2057 }
2058
2059 /* console_lock is held */
2060 static void csi_P(struct vc_data *vc)
2061 {
2062 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_cols - vc->state.x);
2063
2064 delete_char(vc, nr);
2065 }
2066
2067 /* console_lock is held */
2068 static void csi_M(struct vc_data *vc)
2069 {
2070 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_rows - vc->state.y);
2071
2072 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
2073 vc->vc_need_wrap = 0;
2074 }
2075
2076 /* console_lock is held (except via vc_init->reset_terminal */
2077 static void save_cur(struct vc_data *vc)
2078 {
2079 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
2080 }
2081
2082 /* console_lock is held */
2083 static void restore_cur(struct vc_data *vc)
2084 {
2085 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2086
2087 gotoxy(vc, vc->state.x, vc->state.y);
2088 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2089 vc);
2090 update_attr(vc);
2091 vc->vc_need_wrap = 0;
2092 }
2093
2094 /**
2095 * enum vc_ctl_state - control characters state of a vt
2096 *
2097 * @ESnormal: initial state, no control characters parsed
2098 * @ESesc: ESC parsed
2099 * @ESsquare: CSI parsed -- modifiers/parameters/ctrl chars expected
2100 * @ESgetpars: CSI parsed -- parameters/ctrl chars expected
2101 * @ESfunckey: CSI [ parsed
2102 * @EShash: ESC # parsed
2103 * @ESsetG0: ESC ( parsed
2104 * @ESsetG1: ESC ) parsed
2105 * @ESpercent: ESC % parsed
2106 * @EScsiignore: CSI [0x20-0x3f] parsed
2107 * @ESnonstd: OSC parsed
2108 * @ESpalette: OSC P parsed
2109 * @ESosc: OSC [0-9] parsed
2110 * @ESANSI_first: first state for ignoring ansi control sequences
2111 * @ESapc: ESC _ parsed
2112 * @ESpm: ESC ^ parsed
2113 * @ESdcs: ESC P parsed
2114 * @ESANSI_last: last state for ignoring ansi control sequences
2115 */
2116 enum vc_ctl_state {
2117 ESnormal,
2118 ESesc,
2119 ESsquare,
2120 ESgetpars,
2121 ESfunckey,
2122 EShash,
2123 ESsetG0,
2124 ESsetG1,
2125 ESpercent,
2126 EScsiignore,
2127 ESnonstd,
2128 ESpalette,
2129 ESosc,
2130 ESANSI_first = ESosc,
2131 ESapc,
2132 ESpm,
2133 ESdcs,
2134 ESANSI_last = ESdcs,
2135 };
2136
2137 /* console_lock is held (except via vc_init()) */
2138 static void reset_terminal(struct vc_data *vc, int do_clear)
2139 {
2140 unsigned int i;
2141
2142 vc->vc_top = 0;
2143 vc->vc_bottom = vc->vc_rows;
2144 vc->vc_state = ESnormal;
2145 vc->vc_priv = EPecma;
2146 vc->vc_translate = set_translate(LAT1_MAP, vc);
2147 vc->state.Gx_charset[0] = LAT1_MAP;
2148 vc->state.Gx_charset[1] = GRAF_MAP;
2149 vc->state.charset = 0;
2150 vc->vc_need_wrap = 0;
2151 vc->vc_report_mouse = 0;
2152 vc->vc_utf = default_utf8;
2153 vc->vc_utf_count = 0;
2154
2155 vc->vc_disp_ctrl = 0;
2156 vc->vc_toggle_meta = 0;
2157
2158 vc->vc_decscnm = 0;
2159 vc->vc_decom = 0;
2160 vc->vc_decawm = 1;
2161 vc->vc_deccm = global_cursor_default;
2162 vc->vc_decim = 0;
2163
2164 vt_reset_keyboard(vc->vc_num);
2165
2166 vc->vc_cursor_type = cur_default;
2167 vc->vc_complement_mask = vc->vc_s_complement_mask;
2168
2169 default_attr(vc);
2170 update_attr(vc);
2171
2172 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2173 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2174 set_bit(i, vc->vc_tab_stop);
2175
2176 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2177 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2178 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2179
2180 gotoxy(vc, 0, 0);
2181 save_cur(vc);
2182 if (do_clear)
2183 csi_J(vc, CSI_J_VISIBLE);
2184 }
2185
2186 static void vc_setGx(struct vc_data *vc, unsigned int which, u8 c)
2187 {
2188 unsigned char *charset = &vc->state.Gx_charset[which];
2189
2190 switch (c) {
2191 case '0':
2192 *charset = GRAF_MAP;
2193 break;
2194 case 'B':
2195 *charset = LAT1_MAP;
2196 break;
2197 case 'U':
2198 *charset = IBMPC_MAP;
2199 break;
2200 case 'K':
2201 *charset = USER_MAP;
2202 break;
2203 }
2204
2205 if (vc->state.charset == which)
2206 vc->vc_translate = set_translate(*charset, vc);
2207 }
2208
2209 static bool ansi_control_string(enum vc_ctl_state state)
2210 {
2211 return state >= ESANSI_first && state <= ESANSI_last;
2212 }
2213
2214 enum {
2215 ASCII_NULL = 0,
2216 ASCII_BELL = 7,
2217 ASCII_BACKSPACE = 8,
2218 ASCII_IGNORE_FIRST = ASCII_BACKSPACE,
2219 ASCII_HTAB = 9,
2220 ASCII_LINEFEED = 10,
2221 ASCII_VTAB = 11,
2222 ASCII_FORMFEED = 12,
2223 ASCII_CAR_RET = 13,
2224 ASCII_IGNORE_LAST = ASCII_CAR_RET,
2225 ASCII_SHIFTOUT = 14,
2226 ASCII_SHIFTIN = 15,
2227 ASCII_CANCEL = 24,
2228 ASCII_SUBSTITUTE = 26,
2229 ASCII_ESCAPE = 27,
2230 ASCII_CSI_IGNORE_FIRST = ' ', /* 0x2x, 0x3a and 0x3c - 0x3f */
2231 ASCII_CSI_IGNORE_LAST = '?',
2232 ASCII_DEL = 127,
2233 ASCII_EXT_CSI = 128 + ASCII_ESCAPE,
2234 };
2235
2236 /*
2237 * Handle ascii characters in control sequences and change states accordingly.
2238 * E.g. ESC sets the state of vc to ESesc.
2239 *
2240 * Returns: true if @c handled.
2241 */
2242 static bool handle_ascii(struct tty_struct *tty, struct vc_data *vc, u8 c)
2243 {
2244 switch (c) {
2245 case ASCII_NULL:
2246 return true;
2247 case ASCII_BELL:
2248 if (ansi_control_string(vc->vc_state))
2249 vc->vc_state = ESnormal;
2250 else if (vc->vc_bell_duration)
2251 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2252 return true;
2253 case ASCII_BACKSPACE:
2254 bs(vc);
2255 return true;
2256 case ASCII_HTAB:
2257 vc->vc_pos -= (vc->state.x << 1);
2258
2259 vc->state.x = find_next_bit(vc->vc_tab_stop,
2260 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2261 vc->state.x + 1);
2262 if (vc->state.x >= VC_TABSTOPS_COUNT)
2263 vc->state.x = vc->vc_cols - 1;
2264
2265 vc->vc_pos += (vc->state.x << 1);
2266 notify_write(vc, '\t');
2267 return true;
2268 case ASCII_LINEFEED:
2269 case ASCII_VTAB:
2270 case ASCII_FORMFEED:
2271 lf(vc);
2272 if (!is_kbd(vc, lnm))
2273 return true;
2274 fallthrough;
2275 case ASCII_CAR_RET:
2276 cr(vc);
2277 return true;
2278 case ASCII_SHIFTOUT:
2279 vc->state.charset = 1;
2280 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
2281 vc->vc_disp_ctrl = 1;
2282 return true;
2283 case ASCII_SHIFTIN:
2284 vc->state.charset = 0;
2285 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
2286 vc->vc_disp_ctrl = 0;
2287 return true;
2288 case ASCII_CANCEL:
2289 case ASCII_SUBSTITUTE:
2290 vc->vc_state = ESnormal;
2291 return true;
2292 case ASCII_ESCAPE:
2293 vc->vc_state = ESesc;
2294 return true;
2295 case ASCII_DEL:
2296 del(vc);
2297 return true;
2298 case ASCII_EXT_CSI:
2299 vc->vc_state = ESsquare;
2300 return true;
2301 }
2302
2303 return false;
2304 }
2305
2306 /*
2307 * Handle a character (@c) following an ESC (when @vc is in the ESesc state).
2308 * E.g. previous ESC with @c == '[' here yields the ESsquare state (that is:
2309 * CSI).
2310 */
2311 static void handle_esc(struct tty_struct *tty, struct vc_data *vc, u8 c)
2312 {
2313 vc->vc_state = ESnormal;
2314 switch (c) {
2315 case '[':
2316 vc->vc_state = ESsquare;
2317 break;
2318 case ']':
2319 vc->vc_state = ESnonstd;
2320 break;
2321 case '_':
2322 vc->vc_state = ESapc;
2323 break;
2324 case '^':
2325 vc->vc_state = ESpm;
2326 break;
2327 case '%':
2328 vc->vc_state = ESpercent;
2329 break;
2330 case 'E':
2331 cr(vc);
2332 lf(vc);
2333 break;
2334 case 'M':
2335 ri(vc);
2336 break;
2337 case 'D':
2338 lf(vc);
2339 break;
2340 case 'H':
2341 if (vc->state.x < VC_TABSTOPS_COUNT)
2342 set_bit(vc->state.x, vc->vc_tab_stop);
2343 break;
2344 case 'P':
2345 vc->vc_state = ESdcs;
2346 break;
2347 case 'Z':
2348 respond_ID(tty);
2349 break;
2350 case '7':
2351 save_cur(vc);
2352 break;
2353 case '8':
2354 restore_cur(vc);
2355 break;
2356 case '(':
2357 vc->vc_state = ESsetG0;
2358 break;
2359 case ')':
2360 vc->vc_state = ESsetG1;
2361 break;
2362 case '#':
2363 vc->vc_state = EShash;
2364 break;
2365 case 'c':
2366 reset_terminal(vc, 1);
2367 break;
2368 case '>': /* Numeric keypad */
2369 clr_kbd(vc, kbdapplic);
2370 break;
2371 case '=': /* Appl. keypad */
2372 set_kbd(vc, kbdapplic);
2373 break;
2374 }
2375 }
2376
2377 /*
2378 * Handle special DEC control sequences ("ESC [ ? parameters char"). Parameters
2379 * are in @vc->vc_par and the char is in @c here.
2380 */
2381 static void csi_DEC(struct tty_struct *tty, struct vc_data *vc, u8 c)
2382 {
2383 switch (c) {
2384 case 'h':
2385 csi_DEC_hl(vc, true);
2386 break;
2387 case 'l':
2388 csi_DEC_hl(vc, false);
2389 break;
2390 case 'c':
2391 if (vc->vc_par[0])
2392 vc->vc_cursor_type = CUR_MAKE(vc->vc_par[0],
2393 vc->vc_par[1],
2394 vc->vc_par[2]);
2395 else
2396 vc->vc_cursor_type = cur_default;
2397 break;
2398 case 'm':
2399 clear_selection();
2400 if (vc->vc_par[0])
2401 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2402 else
2403 vc->vc_complement_mask = vc->vc_s_complement_mask;
2404 break;
2405 case 'n':
2406 if (vc->vc_par[0] == 5)
2407 status_report(tty);
2408 else if (vc->vc_par[0] == 6)
2409 cursor_report(vc, tty);
2410 break;
2411 }
2412 }
2413
2414 /*
2415 * Handle Control Sequence Introducer control characters. That is
2416 * "ESC [ parameters char". Parameters are in @vc->vc_par and the char is in
2417 * @c here.
2418 */
2419 static void csi_ECMA(struct tty_struct *tty, struct vc_data *vc, u8 c)
2420 {
2421 switch (c) {
2422 case 'G':
2423 case '`':
2424 if (vc->vc_par[0])
2425 vc->vc_par[0]--;
2426 gotoxy(vc, vc->vc_par[0], vc->state.y);
2427 break;
2428 case 'A':
2429 if (!vc->vc_par[0])
2430 vc->vc_par[0]++;
2431 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
2432 break;
2433 case 'B':
2434 case 'e':
2435 if (!vc->vc_par[0])
2436 vc->vc_par[0]++;
2437 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
2438 break;
2439 case 'C':
2440 case 'a':
2441 if (!vc->vc_par[0])
2442 vc->vc_par[0]++;
2443 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
2444 break;
2445 case 'D':
2446 if (!vc->vc_par[0])
2447 vc->vc_par[0]++;
2448 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
2449 break;
2450 case 'E':
2451 if (!vc->vc_par[0])
2452 vc->vc_par[0]++;
2453 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
2454 break;
2455 case 'F':
2456 if (!vc->vc_par[0])
2457 vc->vc_par[0]++;
2458 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
2459 break;
2460 case 'd':
2461 if (vc->vc_par[0])
2462 vc->vc_par[0]--;
2463 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
2464 break;
2465 case 'H':
2466 case 'f':
2467 if (vc->vc_par[0])
2468 vc->vc_par[0]--;
2469 if (vc->vc_par[1])
2470 vc->vc_par[1]--;
2471 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2472 break;
2473 case 'J':
2474 csi_J(vc, vc->vc_par[0]);
2475 break;
2476 case 'K':
2477 csi_K(vc);
2478 break;
2479 case 'L':
2480 csi_L(vc);
2481 break;
2482 case 'M':
2483 csi_M(vc);
2484 break;
2485 case 'P':
2486 csi_P(vc);
2487 break;
2488 case 'c':
2489 if (!vc->vc_par[0])
2490 respond_ID(tty);
2491 break;
2492 case 'g':
2493 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2494 set_bit(vc->state.x, vc->vc_tab_stop);
2495 else if (vc->vc_par[0] == 3)
2496 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2497 break;
2498 case 'h':
2499 csi_hl(vc, true);
2500 break;
2501 case 'l':
2502 csi_hl(vc, false);
2503 break;
2504 case 'm':
2505 csi_m(vc);
2506 break;
2507 case 'n':
2508 if (vc->vc_par[0] == 5)
2509 status_report(tty);
2510 else if (vc->vc_par[0] == 6)
2511 cursor_report(vc, tty);
2512 break;
2513 case 'q': /* DECLL - but only 3 leds */
2514 /* map 0,1,2,3 to 0,1,2,4 */
2515 if (vc->vc_par[0] < 4)
2516 vt_set_led_state(vc->vc_num,
2517 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2518 break;
2519 case 'r':
2520 if (!vc->vc_par[0])
2521 vc->vc_par[0]++;
2522 if (!vc->vc_par[1])
2523 vc->vc_par[1] = vc->vc_rows;
2524 /* Minimum allowed region is 2 lines */
2525 if (vc->vc_par[0] < vc->vc_par[1] &&
2526 vc->vc_par[1] <= vc->vc_rows) {
2527 vc->vc_top = vc->vc_par[0] - 1;
2528 vc->vc_bottom = vc->vc_par[1];
2529 gotoxay(vc, 0, 0);
2530 }
2531 break;
2532 case 's':
2533 save_cur(vc);
2534 break;
2535 case 'u':
2536 restore_cur(vc);
2537 break;
2538 case 'X':
2539 csi_X(vc);
2540 break;
2541 case '@':
2542 csi_at(vc, vc->vc_par[0]);
2543 break;
2544 case ']':
2545 csi_RSB(vc);
2546 break;
2547 }
2548
2549 }
2550
2551 static void vc_reset_params(struct vc_data *vc)
2552 {
2553 memset(vc->vc_par, 0, sizeof(vc->vc_par));
2554 vc->vc_npar = 0;
2555 }
2556
2557 /* console_lock is held */
2558 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
2559 {
2560 /*
2561 * Control characters can be used in the _middle_
2562 * of an escape sequence, aside from ANSI control strings.
2563 */
2564 if (ansi_control_string(vc->vc_state) && c >= ASCII_IGNORE_FIRST &&
2565 c <= ASCII_IGNORE_LAST)
2566 return;
2567
2568 if (handle_ascii(tty, vc, c))
2569 return;
2570
2571 switch(vc->vc_state) {
2572 case ESesc: /* ESC */
2573 handle_esc(tty, vc, c);
2574 return;
2575 case ESnonstd: /* ESC ] aka OSC */
2576 switch (c) {
2577 case 'P': /* palette escape sequence */
2578 vc_reset_params(vc);
2579 vc->vc_state = ESpalette;
2580 return;
2581 case 'R': /* reset palette */
2582 reset_palette(vc);
2583 break;
2584 case '0' ... '9':
2585 vc->vc_state = ESosc;
2586 return;
2587 }
2588 vc->vc_state = ESnormal;
2589 return;
2590 case ESpalette: /* ESC ] P aka OSC P */
2591 if (isxdigit(c)) {
2592 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2593 if (vc->vc_npar == 7) {
2594 int i = vc->vc_par[0] * 3, j = 1;
2595 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2596 vc->vc_palette[i++] += vc->vc_par[j++];
2597 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2598 vc->vc_palette[i++] += vc->vc_par[j++];
2599 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2600 vc->vc_palette[i] += vc->vc_par[j];
2601 set_palette(vc);
2602 vc->vc_state = ESnormal;
2603 }
2604 } else
2605 vc->vc_state = ESnormal;
2606 return;
2607 case ESsquare: /* ESC [ aka CSI, parameters or modifiers expected */
2608 vc_reset_params(vc);
2609
2610 vc->vc_state = ESgetpars;
2611 switch (c) {
2612 case '[': /* Function key */
2613 vc->vc_state = ESfunckey;
2614 return;
2615 case '?':
2616 vc->vc_priv = EPdec;
2617 return;
2618 case '>':
2619 vc->vc_priv = EPgt;
2620 return;
2621 case '=':
2622 vc->vc_priv = EPeq;
2623 return;
2624 case '<':
2625 vc->vc_priv = EPlt;
2626 return;
2627 }
2628 vc->vc_priv = EPecma;
2629 fallthrough;
2630 case ESgetpars: /* ESC [ aka CSI, parameters expected */
2631 switch (c) {
2632 case ';':
2633 if (vc->vc_npar < NPAR - 1) {
2634 vc->vc_npar++;
2635 return;
2636 }
2637 break;
2638 case '0' ... '9':
2639 vc->vc_par[vc->vc_npar] *= 10;
2640 vc->vc_par[vc->vc_npar] += c - '0';
2641 return;
2642 }
2643 if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST) {
2644 vc->vc_state = EScsiignore;
2645 return;
2646 }
2647
2648 /* parameters done, handle the control char @c */
2649
2650 vc->vc_state = ESnormal;
2651
2652 switch (vc->vc_priv) {
2653 case EPdec:
2654 csi_DEC(tty, vc, c);
2655 return;
2656 case EPecma:
2657 csi_ECMA(tty, vc, c);
2658 return;
2659 default:
2660 return;
2661 }
2662 case EScsiignore:
2663 if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST)
2664 return;
2665 vc->vc_state = ESnormal;
2666 return;
2667 case ESpercent: /* ESC % */
2668 vc->vc_state = ESnormal;
2669 switch (c) {
2670 case '@': /* defined in ISO 2022 */
2671 vc->vc_utf = 0;
2672 return;
2673 case 'G': /* prelim official escape code */
2674 case '8': /* retained for compatibility */
2675 vc->vc_utf = 1;
2676 return;
2677 }
2678 return;
2679 case ESfunckey: /* ESC [ [ aka CSI [ */
2680 vc->vc_state = ESnormal;
2681 return;
2682 case EShash: /* ESC # */
2683 vc->vc_state = ESnormal;
2684 if (c == '8') {
2685 /* DEC screen alignment test. kludge :-) */
2686 vc->vc_video_erase_char =
2687 (vc->vc_video_erase_char & 0xff00) | 'E';
2688 csi_J(vc, CSI_J_VISIBLE);
2689 vc->vc_video_erase_char =
2690 (vc->vc_video_erase_char & 0xff00) | ' ';
2691 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2692 }
2693 return;
2694 case ESsetG0: /* ESC ( */
2695 vc_setGx(vc, 0, c);
2696 vc->vc_state = ESnormal;
2697 return;
2698 case ESsetG1: /* ESC ) */
2699 vc_setGx(vc, 1, c);
2700 vc->vc_state = ESnormal;
2701 return;
2702 case ESapc: /* ESC _ */
2703 return;
2704 case ESosc: /* ESC ] [0-9] aka OSC [0-9] */
2705 return;
2706 case ESpm: /* ESC ^ */
2707 return;
2708 case ESdcs: /* ESC P */
2709 return;
2710 default:
2711 vc->vc_state = ESnormal;
2712 }
2713 }
2714
2715 /* is_double_width() is based on the wcwidth() implementation by
2716 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2717 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2718 */
2719 struct interval {
2720 uint32_t first;
2721 uint32_t last;
2722 };
2723
2724 static int ucs_cmp(const void *key, const void *elt)
2725 {
2726 uint32_t ucs = *(uint32_t *)key;
2727 struct interval e = *(struct interval *) elt;
2728
2729 if (ucs > e.last)
2730 return 1;
2731 else if (ucs < e.first)
2732 return -1;
2733 return 0;
2734 }
2735
2736 static int is_double_width(uint32_t ucs)
2737 {
2738 static const struct interval double_width[] = {
2739 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2740 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2741 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2742 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2743 };
2744 if (ucs < double_width[0].first ||
2745 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2746 return 0;
2747
2748 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2749 sizeof(struct interval), ucs_cmp) != NULL;
2750 }
2751
2752 struct vc_draw_region {
2753 unsigned long from, to;
2754 int x;
2755 };
2756
2757 static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2758 {
2759 if (draw->x < 0)
2760 return;
2761
2762 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2763 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2764 draw->x);
2765 draw->x = -1;
2766 }
2767
2768 static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2769 {
2770 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2771 if (vc->vc_toggle_meta)
2772 c |= 0x80;
2773
2774 return vc->vc_translate[c];
2775 }
2776
2777 return c;
2778 }
2779
2780
2781 /**
2782 * vc_sanitize_unicode - Replace invalid Unicode code points with ``U+FFFD``
2783 * @c: the received code point
2784 */
2785 static inline int vc_sanitize_unicode(const int c)
2786 {
2787 if (c >= 0xd800 && c <= 0xdfff)
2788 return 0xfffd;
2789
2790 return c;
2791 }
2792
2793 /**
2794 * vc_translate_unicode - Combine UTF-8 into Unicode in &vc_data.vc_utf_char
2795 * @vc: virtual console
2796 * @c: UTF-8 byte to translate
2797 * @rescan: set to true iff @c wasn't consumed here and needs to be re-processed
2798 *
2799 * * &vc_data.vc_utf_char is the being-constructed Unicode code point.
2800 * * &vc_data.vc_utf_count is the number of continuation bytes still expected to
2801 * arrive.
2802 * * &vc_data.vc_npar is the number of continuation bytes arrived so far.
2803 *
2804 * Return:
2805 * * %-1 - Input OK so far, @c consumed, further bytes expected.
2806 * * %0xFFFD - Possibility 1: input invalid, @c may have been consumed (see
2807 * desc. of @rescan). Possibility 2: input OK, @c consumed,
2808 * ``U+FFFD`` is the resulting code point. ``U+FFFD`` is valid,
2809 * ``REPLACEMENT CHARACTER``.
2810 * * otherwise - Input OK, @c consumed, resulting code point returned.
2811 */
2812 static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2813 {
2814 static const u32 utf8_length_changes[] = {0x7f, 0x7ff, 0xffff, 0x10ffff};
2815
2816 /* Continuation byte received */
2817 if ((c & 0xc0) == 0x80) {
2818 /* Unexpected continuation byte? */
2819 if (!vc->vc_utf_count)
2820 return 0xfffd;
2821
2822 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2823 vc->vc_npar++;
2824 if (--vc->vc_utf_count)
2825 goto need_more_bytes;
2826
2827 /* Got a whole character */
2828 c = vc->vc_utf_char;
2829 /* Reject overlong sequences */
2830 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2831 c > utf8_length_changes[vc->vc_npar])
2832 return 0xfffd;
2833
2834 return vc_sanitize_unicode(c);
2835 }
2836
2837 /* Single ASCII byte or first byte of a sequence received */
2838 if (vc->vc_utf_count) {
2839 /* Continuation byte expected */
2840 *rescan = true;
2841 vc->vc_utf_count = 0;
2842 return 0xfffd;
2843 }
2844
2845 /* Nothing to do if an ASCII byte was received */
2846 if (c <= 0x7f)
2847 return c;
2848
2849 /* First byte of a multibyte sequence received */
2850 vc->vc_npar = 0;
2851 if ((c & 0xe0) == 0xc0) {
2852 vc->vc_utf_count = 1;
2853 vc->vc_utf_char = (c & 0x1f);
2854 } else if ((c & 0xf0) == 0xe0) {
2855 vc->vc_utf_count = 2;
2856 vc->vc_utf_char = (c & 0x0f);
2857 } else if ((c & 0xf8) == 0xf0) {
2858 vc->vc_utf_count = 3;
2859 vc->vc_utf_char = (c & 0x07);
2860 } else {
2861 return 0xfffd;
2862 }
2863
2864 need_more_bytes:
2865 return -1;
2866 }
2867
2868 static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2869 {
2870 /* Do no translation at all in control states */
2871 if (vc->vc_state != ESnormal)
2872 return *c;
2873
2874 if (vc->vc_utf && !vc->vc_disp_ctrl)
2875 return *c = vc_translate_unicode(vc, *c, rescan);
2876
2877 /* no utf or alternate charset mode */
2878 return vc_translate_ascii(vc, *c);
2879 }
2880
2881 static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2882 {
2883 if (!vc->vc_can_do_color)
2884 return vc->vc_attr ^ 0x08;
2885
2886 if (vc->vc_hi_font_mask == 0x100)
2887 return (vc->vc_attr & 0x11) |
2888 ((vc->vc_attr & 0xe0) >> 4) |
2889 ((vc->vc_attr & 0x0e) << 4);
2890
2891 return (vc->vc_attr & 0x88) |
2892 ((vc->vc_attr & 0x70) >> 4) |
2893 ((vc->vc_attr & 0x07) << 4);
2894 }
2895
2896 static bool vc_is_control(struct vc_data *vc, int tc, int c)
2897 {
2898 /*
2899 * A bitmap for codes <32. A bit of 1 indicates that the code
2900 * corresponding to that bit number invokes some special action (such
2901 * as cursor movement) and should not be displayed as a glyph unless
2902 * the disp_ctrl mode is explicitly enabled.
2903 */
2904 static const u32 CTRL_ACTION = BIT(ASCII_NULL) |
2905 GENMASK(ASCII_SHIFTIN, ASCII_BELL) | BIT(ASCII_CANCEL) |
2906 BIT(ASCII_SUBSTITUTE) | BIT(ASCII_ESCAPE);
2907 /* Cannot be overridden by disp_ctrl */
2908 static const u32 CTRL_ALWAYS = BIT(ASCII_NULL) | BIT(ASCII_BACKSPACE) |
2909 BIT(ASCII_LINEFEED) | BIT(ASCII_SHIFTIN) | BIT(ASCII_SHIFTOUT) |
2910 BIT(ASCII_CAR_RET) | BIT(ASCII_FORMFEED) | BIT(ASCII_ESCAPE);
2911
2912 if (vc->vc_state != ESnormal)
2913 return true;
2914
2915 if (!tc)
2916 return true;
2917
2918 /*
2919 * If the original code was a control character we only allow a glyph
2920 * to be displayed if the code is not normally used (such as for cursor
2921 * movement) or if the disp_ctrl mode has been explicitly enabled.
2922 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2923 * displayed as control characters, as the console would be pretty
2924 * useless without them; to display an arbitrary font position use the
2925 * direct-to-font zone in UTF-8 mode.
2926 */
2927 if (c < BITS_PER_TYPE(CTRL_ALWAYS)) {
2928 if (vc->vc_disp_ctrl)
2929 return CTRL_ALWAYS & BIT(c);
2930 else
2931 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2932 }
2933
2934 if (c == ASCII_DEL && !vc->vc_disp_ctrl)
2935 return true;
2936
2937 if (c == ASCII_EXT_CSI)
2938 return true;
2939
2940 return false;
2941 }
2942
2943 static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2944 struct vc_draw_region *draw)
2945 {
2946 int next_c;
2947 unsigned char vc_attr = vc->vc_attr;
2948 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2949 u8 width = 1;
2950 bool inverse = false;
2951
2952 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2953 if (is_double_width(c))
2954 width = 2;
2955 }
2956
2957 /* Now try to find out how to display it */
2958 tc = conv_uni_to_pc(vc, tc);
2959 if (tc & ~charmask) {
2960 if (tc == -1 || tc == -2)
2961 return -1; /* nothing to display */
2962
2963 /* Glyph not found */
2964 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
2965 !(c & ~charmask)) {
2966 /*
2967 * In legacy mode use the glyph we get by a 1:1
2968 * mapping.
2969 * This would make absolutely no sense with Unicode in
2970 * mind, but do this for ASCII characters since a font
2971 * may lack Unicode mapping info and we don't want to
2972 * end up with having question marks only.
2973 */
2974 tc = c;
2975 } else {
2976 /*
2977 * Display U+FFFD. If it's not found, display an inverse
2978 * question mark.
2979 */
2980 tc = conv_uni_to_pc(vc, 0xfffd);
2981 if (tc < 0) {
2982 inverse = true;
2983 tc = conv_uni_to_pc(vc, '?');
2984 if (tc < 0)
2985 tc = '?';
2986
2987 vc_attr = vc_invert_attr(vc);
2988 con_flush(vc, draw);
2989 }
2990 }
2991 }
2992
2993 next_c = c;
2994 while (1) {
2995 if (vc->vc_need_wrap || vc->vc_decim)
2996 con_flush(vc, draw);
2997 if (vc->vc_need_wrap) {
2998 cr(vc);
2999 lf(vc);
3000 }
3001 if (vc->vc_decim)
3002 insert_char(vc, 1);
3003 vc_uniscr_putc(vc, next_c);
3004
3005 if (himask)
3006 tc = ((tc & 0x100) ? himask : 0) |
3007 (tc & 0xff);
3008 tc |= (vc_attr << 8) & ~himask;
3009
3010 scr_writew(tc, (u16 *)vc->vc_pos);
3011
3012 if (con_should_update(vc) && draw->x < 0) {
3013 draw->x = vc->state.x;
3014 draw->from = vc->vc_pos;
3015 }
3016 if (vc->state.x == vc->vc_cols - 1) {
3017 vc->vc_need_wrap = vc->vc_decawm;
3018 draw->to = vc->vc_pos + 2;
3019 } else {
3020 vc->state.x++;
3021 draw->to = (vc->vc_pos += 2);
3022 }
3023
3024 if (!--width)
3025 break;
3026
3027 /* A space is printed in the second column */
3028 tc = conv_uni_to_pc(vc, ' ');
3029 if (tc < 0)
3030 tc = ' ';
3031 next_c = ' ';
3032 }
3033 notify_write(vc, c);
3034
3035 if (inverse)
3036 con_flush(vc, draw);
3037
3038 return 0;
3039 }
3040
3041 /* acquires console_lock */
3042 static int do_con_write(struct tty_struct *tty, const u8 *buf, int count)
3043 {
3044 struct vc_draw_region draw = {
3045 .x = -1,
3046 };
3047 int c, tc, n = 0;
3048 unsigned int currcons;
3049 struct vc_data *vc = tty->driver_data;
3050 struct vt_notifier_param param;
3051 bool rescan;
3052
3053 if (in_interrupt())
3054 return count;
3055
3056 console_lock();
3057 currcons = vc->vc_num;
3058 if (!vc_cons_allocated(currcons)) {
3059 /* could this happen? */
3060 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
3061 console_unlock();
3062 return 0;
3063 }
3064
3065
3066 /* undraw cursor first */
3067 if (con_is_fg(vc))
3068 hide_cursor(vc);
3069
3070 param.vc = vc;
3071
3072 while (!tty->flow.stopped && count) {
3073 u8 orig = *buf;
3074 buf++;
3075 n++;
3076 count--;
3077 rescan_last_byte:
3078 c = orig;
3079 rescan = false;
3080
3081 tc = vc_translate(vc, &c, &rescan);
3082 if (tc == -1)
3083 continue;
3084
3085 param.c = tc;
3086 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
3087 &param) == NOTIFY_STOP)
3088 continue;
3089
3090 if (vc_is_control(vc, tc, c)) {
3091 con_flush(vc, &draw);
3092 do_con_trol(tty, vc, orig);
3093 continue;
3094 }
3095
3096 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
3097 continue;
3098
3099 if (rescan)
3100 goto rescan_last_byte;
3101 }
3102 con_flush(vc, &draw);
3103 console_conditional_schedule();
3104 notify_update(vc);
3105 console_unlock();
3106 return n;
3107 }
3108
3109 /*
3110 * This is the console switching callback.
3111 *
3112 * Doing console switching in a process context allows
3113 * us to do the switches asynchronously (needed when we want
3114 * to switch due to a keyboard interrupt). Synchronization
3115 * with other console code and prevention of re-entrancy is
3116 * ensured with console_lock.
3117 */
3118 static void console_callback(struct work_struct *ignored)
3119 {
3120 console_lock();
3121
3122 if (want_console >= 0) {
3123 if (want_console != fg_console &&
3124 vc_cons_allocated(want_console)) {
3125 hide_cursor(vc_cons[fg_console].d);
3126 change_console(vc_cons[want_console].d);
3127 /* we only changed when the console had already
3128 been allocated - a new console is not created
3129 in an interrupt routine */
3130 }
3131 want_console = -1;
3132 }
3133 if (do_poke_blanked_console) { /* do not unblank for a LED change */
3134 do_poke_blanked_console = 0;
3135 poke_blanked_console();
3136 }
3137 if (scrollback_delta) {
3138 struct vc_data *vc = vc_cons[fg_console].d;
3139 clear_selection();
3140 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
3141 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
3142 scrollback_delta = 0;
3143 }
3144 if (blank_timer_expired) {
3145 do_blank_screen(0);
3146 blank_timer_expired = 0;
3147 }
3148 notify_update(vc_cons[fg_console].d);
3149
3150 console_unlock();
3151 }
3152
3153 int set_console(int nr)
3154 {
3155 struct vc_data *vc = vc_cons[fg_console].d;
3156
3157 if (!vc_cons_allocated(nr) || vt_dont_switch ||
3158 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
3159
3160 /*
3161 * Console switch will fail in console_callback() or
3162 * change_console() so there is no point scheduling
3163 * the callback
3164 *
3165 * Existing set_console() users don't check the return
3166 * value so this shouldn't break anything
3167 */
3168 return -EINVAL;
3169 }
3170
3171 want_console = nr;
3172 schedule_console_callback();
3173
3174 return 0;
3175 }
3176
3177 struct tty_driver *console_driver;
3178
3179 #ifdef CONFIG_VT_CONSOLE
3180
3181 /**
3182 * vt_kmsg_redirect() - sets/gets the kernel message console
3183 * @new: the new virtual terminal number or -1 if the console should stay
3184 * unchanged
3185 *
3186 * By default, the kernel messages are always printed on the current virtual
3187 * console. However, the user may modify that default with the
3188 * %TIOCL_SETKMSGREDIRECT ioctl call.
3189 *
3190 * This function sets the kernel message console to be @new. It returns the old
3191 * virtual console number. The virtual terminal number %0 (both as parameter and
3192 * return value) means no redirection (i.e. always printed on the currently
3193 * active console).
3194 *
3195 * The parameter -1 means that only the current console is returned, but the
3196 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3197 * case to make the code more understandable.
3198 *
3199 * When the kernel is compiled without %CONFIG_VT_CONSOLE, this function ignores
3200 * the parameter and always returns %0.
3201 */
3202 int vt_kmsg_redirect(int new)
3203 {
3204 static int kmsg_con;
3205
3206 if (new != -1)
3207 return xchg(&kmsg_con, new);
3208 else
3209 return kmsg_con;
3210 }
3211
3212 /*
3213 * Console on virtual terminal
3214 *
3215 * The console must be locked when we get here.
3216 */
3217
3218 static void vt_console_print(struct console *co, const char *b, unsigned count)
3219 {
3220 struct vc_data *vc = vc_cons[fg_console].d;
3221 unsigned char c;
3222 static DEFINE_SPINLOCK(printing_lock);
3223 const ushort *start;
3224 ushort start_x, cnt;
3225 int kmsg_console;
3226
3227 WARN_CONSOLE_UNLOCKED();
3228
3229 /* this protects against concurrent oops only */
3230 if (!spin_trylock(&printing_lock))
3231 return;
3232
3233 kmsg_console = vt_get_kmsg_redirect();
3234 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3235 vc = vc_cons[kmsg_console - 1].d;
3236
3237 if (!vc_cons_allocated(fg_console)) {
3238 /* impossible */
3239 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3240 goto quit;
3241 }
3242
3243 if (vc->vc_mode != KD_TEXT)
3244 goto quit;
3245
3246 /* undraw cursor first */
3247 if (con_is_fg(vc))
3248 hide_cursor(vc);
3249
3250 start = (ushort *)vc->vc_pos;
3251 start_x = vc->state.x;
3252 cnt = 0;
3253 while (count--) {
3254 c = *b++;
3255 if (c == ASCII_LINEFEED || c == ASCII_CAR_RET ||
3256 c == ASCII_BACKSPACE || vc->vc_need_wrap) {
3257 if (cnt && con_is_visible(vc))
3258 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3259 cnt = 0;
3260 if (c == ASCII_BACKSPACE) {
3261 bs(vc);
3262 start = (ushort *)vc->vc_pos;
3263 start_x = vc->state.x;
3264 continue;
3265 }
3266 if (c != ASCII_CAR_RET)
3267 lf(vc);
3268 cr(vc);
3269 start = (ushort *)vc->vc_pos;
3270 start_x = vc->state.x;
3271 if (c == ASCII_LINEFEED || c == ASCII_CAR_RET)
3272 continue;
3273 }
3274 vc_uniscr_putc(vc, c);
3275 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3276 notify_write(vc, c);
3277 cnt++;
3278 if (vc->state.x == vc->vc_cols - 1) {
3279 vc->vc_need_wrap = 1;
3280 } else {
3281 vc->vc_pos += 2;
3282 vc->state.x++;
3283 }
3284 }
3285 if (cnt && con_is_visible(vc))
3286 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3287 set_cursor(vc);
3288 notify_update(vc);
3289
3290 quit:
3291 spin_unlock(&printing_lock);
3292 }
3293
3294 static struct tty_driver *vt_console_device(struct console *c, int *index)
3295 {
3296 *index = c->index ? c->index-1 : fg_console;
3297 return console_driver;
3298 }
3299
3300 static int vt_console_setup(struct console *co, char *options)
3301 {
3302 return co->index >= MAX_NR_CONSOLES ? -EINVAL : 0;
3303 }
3304
3305 static struct console vt_console_driver = {
3306 .name = "tty",
3307 .setup = vt_console_setup,
3308 .write = vt_console_print,
3309 .device = vt_console_device,
3310 .unblank = unblank_screen,
3311 .flags = CON_PRINTBUFFER,
3312 .index = -1,
3313 };
3314 #endif
3315
3316 /*
3317 * Handling of Linux-specific VC ioctls
3318 */
3319
3320 /*
3321 * Generally a bit racy with respect to console_lock();.
3322 *
3323 * There are some functions which don't need it.
3324 *
3325 * There are some functions which can sleep for arbitrary periods
3326 * (paste_selection) but we don't need the lock there anyway.
3327 *
3328 * set_selection_user has locking, and definitely needs it
3329 */
3330
3331 int tioclinux(struct tty_struct *tty, unsigned long arg)
3332 {
3333 char type, data;
3334 char __user *p = (char __user *)arg;
3335 void __user *param_aligned32 = (u32 __user *)arg + 1;
3336 void __user *param = (void __user *)arg + 1;
3337 int lines;
3338 int ret;
3339
3340 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3341 return -EPERM;
3342 if (get_user(type, p))
3343 return -EFAULT;
3344 ret = 0;
3345
3346 switch (type) {
3347 case TIOCL_SETSEL:
3348 if (!capable(CAP_SYS_ADMIN))
3349 return -EPERM;
3350 return set_selection_user(param, tty);
3351 case TIOCL_PASTESEL:
3352 if (!capable(CAP_SYS_ADMIN))
3353 return -EPERM;
3354 return paste_selection(tty);
3355 case TIOCL_UNBLANKSCREEN:
3356 console_lock();
3357 unblank_screen();
3358 console_unlock();
3359 break;
3360 case TIOCL_SELLOADLUT:
3361 if (!capable(CAP_SYS_ADMIN))
3362 return -EPERM;
3363 return sel_loadlut(param_aligned32);
3364 case TIOCL_GETSHIFTSTATE:
3365 /*
3366 * Make it possible to react to Shift+Mousebutton. Note that
3367 * 'shift_state' is an undocumented kernel-internal variable;
3368 * programs not closely related to the kernel should not use
3369 * this.
3370 */
3371 data = vt_get_shift_state();
3372 return put_user(data, p);
3373 case TIOCL_GETMOUSEREPORTING:
3374 console_lock(); /* May be overkill */
3375 data = mouse_reporting();
3376 console_unlock();
3377 return put_user(data, p);
3378 case TIOCL_SETVESABLANK:
3379 return set_vesa_blanking(param);
3380 case TIOCL_GETKMSGREDIRECT:
3381 data = vt_get_kmsg_redirect();
3382 return put_user(data, p);
3383 case TIOCL_SETKMSGREDIRECT:
3384 if (!capable(CAP_SYS_ADMIN))
3385 return -EPERM;
3386
3387 if (get_user(data, p+1))
3388 return -EFAULT;
3389
3390 vt_kmsg_redirect(data);
3391
3392 break;
3393 case TIOCL_GETFGCONSOLE:
3394 /*
3395 * No locking needed as this is a transiently correct return
3396 * anyway if the caller hasn't disabled switching.
3397 */
3398 return fg_console;
3399 case TIOCL_SCROLLCONSOLE:
3400 if (get_user(lines, (s32 __user *)param_aligned32))
3401 return -EFAULT;
3402
3403 /*
3404 * Needs the console lock here. Note that lots of other calls
3405 * need fixing before the lock is actually useful!
3406 */
3407 console_lock();
3408 scrollfront(vc_cons[fg_console].d, lines);
3409 console_unlock();
3410 break;
3411 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3412 console_lock();
3413 ignore_poke = 1;
3414 do_blank_screen(0);
3415 console_unlock();
3416 break;
3417 case TIOCL_BLANKEDSCREEN:
3418 return console_blanked;
3419 default:
3420 return -EINVAL;
3421 }
3422
3423 return ret;
3424 }
3425
3426 /*
3427 * /dev/ttyN handling
3428 */
3429
3430 static ssize_t con_write(struct tty_struct *tty, const u8 *buf, size_t count)
3431 {
3432 int retval;
3433
3434 retval = do_con_write(tty, buf, count);
3435 con_flush_chars(tty);
3436
3437 return retval;
3438 }
3439
3440 static int con_put_char(struct tty_struct *tty, u8 ch)
3441 {
3442 return do_con_write(tty, &ch, 1);
3443 }
3444
3445 static unsigned int con_write_room(struct tty_struct *tty)
3446 {
3447 if (tty->flow.stopped)
3448 return 0;
3449 return 32768; /* No limit, really; we're not buffering */
3450 }
3451
3452 /*
3453 * con_throttle and con_unthrottle are only used for
3454 * paste_selection(), which has to stuff in a large number of
3455 * characters...
3456 */
3457 static void con_throttle(struct tty_struct *tty)
3458 {
3459 }
3460
3461 static void con_unthrottle(struct tty_struct *tty)
3462 {
3463 struct vc_data *vc = tty->driver_data;
3464
3465 wake_up_interruptible(&vc->paste_wait);
3466 }
3467
3468 /*
3469 * Turn the Scroll-Lock LED on when the tty is stopped
3470 */
3471 static void con_stop(struct tty_struct *tty)
3472 {
3473 int console_num;
3474 if (!tty)
3475 return;
3476 console_num = tty->index;
3477 if (!vc_cons_allocated(console_num))
3478 return;
3479 vt_kbd_con_stop(console_num);
3480 }
3481
3482 /*
3483 * Turn the Scroll-Lock LED off when the console is started
3484 */
3485 static void con_start(struct tty_struct *tty)
3486 {
3487 int console_num;
3488 if (!tty)
3489 return;
3490 console_num = tty->index;
3491 if (!vc_cons_allocated(console_num))
3492 return;
3493 vt_kbd_con_start(console_num);
3494 }
3495
3496 static void con_flush_chars(struct tty_struct *tty)
3497 {
3498 struct vc_data *vc = tty->driver_data;
3499
3500 if (in_interrupt()) /* from flush_to_ldisc */
3501 return;
3502
3503 console_lock();
3504 set_cursor(vc);
3505 console_unlock();
3506 }
3507
3508 /*
3509 * Allocate the console screen memory.
3510 */
3511 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3512 {
3513 unsigned int currcons = tty->index;
3514 struct vc_data *vc;
3515 int ret;
3516
3517 console_lock();
3518 ret = vc_allocate(currcons);
3519 if (ret)
3520 goto unlock;
3521
3522 vc = vc_cons[currcons].d;
3523
3524 /* Still being freed */
3525 if (vc->port.tty) {
3526 ret = -ERESTARTSYS;
3527 goto unlock;
3528 }
3529
3530 ret = tty_port_install(&vc->port, driver, tty);
3531 if (ret)
3532 goto unlock;
3533
3534 tty->driver_data = vc;
3535 vc->port.tty = tty;
3536 tty_port_get(&vc->port);
3537
3538 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3539 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3540 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3541 }
3542 if (vc->vc_utf)
3543 tty->termios.c_iflag |= IUTF8;
3544 else
3545 tty->termios.c_iflag &= ~IUTF8;
3546 unlock:
3547 console_unlock();
3548 return ret;
3549 }
3550
3551 static int con_open(struct tty_struct *tty, struct file *filp)
3552 {
3553 /* everything done in install */
3554 return 0;
3555 }
3556
3557
3558 static void con_close(struct tty_struct *tty, struct file *filp)
3559 {
3560 /* Nothing to do - we defer to shutdown */
3561 }
3562
3563 static void con_shutdown(struct tty_struct *tty)
3564 {
3565 struct vc_data *vc = tty->driver_data;
3566 BUG_ON(vc == NULL);
3567 console_lock();
3568 vc->port.tty = NULL;
3569 console_unlock();
3570 }
3571
3572 static void con_cleanup(struct tty_struct *tty)
3573 {
3574 struct vc_data *vc = tty->driver_data;
3575
3576 tty_port_put(&vc->port);
3577 }
3578
3579 /*
3580 * We can't deal with anything but the N_TTY ldisc,
3581 * because we can sleep in our write() routine.
3582 */
3583 static int con_ldisc_ok(struct tty_struct *tty, int ldisc)
3584 {
3585 return ldisc == N_TTY ? 0 : -EINVAL;
3586 }
3587
3588 static int default_color = 7; /* white */
3589 static int default_italic_color = 2; // green (ASCII)
3590 static int default_underline_color = 3; // cyan (ASCII)
3591 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3592 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3593 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3594
3595 static void vc_init(struct vc_data *vc, int do_clear)
3596 {
3597 int j, k ;
3598
3599 set_origin(vc);
3600 vc->vc_pos = vc->vc_origin;
3601 reset_vc(vc);
3602 for (j=k=0; j<16; j++) {
3603 vc->vc_palette[k++] = default_red[j] ;
3604 vc->vc_palette[k++] = default_grn[j] ;
3605 vc->vc_palette[k++] = default_blu[j] ;
3606 }
3607 vc->vc_def_color = default_color;
3608 vc->vc_ulcolor = default_underline_color;
3609 vc->vc_itcolor = default_italic_color;
3610 vc->vc_halfcolor = 0x08; /* grey */
3611 init_waitqueue_head(&vc->paste_wait);
3612 reset_terminal(vc, do_clear);
3613 }
3614
3615 /*
3616 * This routine initializes console interrupts, and does nothing
3617 * else. If you want the screen to clear, call tty_write with
3618 * the appropriate escape-sequence.
3619 */
3620
3621 static int __init con_init(void)
3622 {
3623 const char *display_desc = NULL;
3624 struct vc_data *vc;
3625 unsigned int currcons = 0, i;
3626
3627 console_lock();
3628
3629 if (!conswitchp)
3630 conswitchp = &dummy_con;
3631 display_desc = conswitchp->con_startup();
3632 if (!display_desc) {
3633 fg_console = 0;
3634 console_unlock();
3635 return 0;
3636 }
3637
3638 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3639 struct con_driver *con_driver = &registered_con_driver[i];
3640
3641 if (con_driver->con == NULL) {
3642 con_driver->con = conswitchp;
3643 con_driver->desc = display_desc;
3644 con_driver->flag = CON_DRIVER_FLAG_INIT;
3645 con_driver->first = 0;
3646 con_driver->last = MAX_NR_CONSOLES - 1;
3647 break;
3648 }
3649 }
3650
3651 for (i = 0; i < MAX_NR_CONSOLES; i++)
3652 con_driver_map[i] = conswitchp;
3653
3654 if (blankinterval) {
3655 blank_state = blank_normal_wait;
3656 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3657 }
3658
3659 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3660 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3661 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3662 tty_port_init(&vc->port);
3663 visual_init(vc, currcons, true);
3664 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3665 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3666 vc_init(vc, currcons || !vc->vc_sw->con_save_screen);
3667 }
3668 currcons = fg_console = 0;
3669 master_display_fg = vc = vc_cons[currcons].d;
3670 set_origin(vc);
3671 save_screen(vc);
3672 gotoxy(vc, vc->state.x, vc->state.y);
3673 csi_J(vc, CSI_J_CURSOR_TO_END);
3674 update_screen(vc);
3675 pr_info("Console: %s %s %dx%d\n",
3676 vc->vc_can_do_color ? "colour" : "mono",
3677 display_desc, vc->vc_cols, vc->vc_rows);
3678
3679 console_unlock();
3680
3681 #ifdef CONFIG_VT_CONSOLE
3682 register_console(&vt_console_driver);
3683 #endif
3684 return 0;
3685 }
3686 console_initcall(con_init);
3687
3688 static const struct tty_operations con_ops = {
3689 .install = con_install,
3690 .open = con_open,
3691 .close = con_close,
3692 .write = con_write,
3693 .write_room = con_write_room,
3694 .put_char = con_put_char,
3695 .flush_chars = con_flush_chars,
3696 .ioctl = vt_ioctl,
3697 #ifdef CONFIG_COMPAT
3698 .compat_ioctl = vt_compat_ioctl,
3699 #endif
3700 .stop = con_stop,
3701 .start = con_start,
3702 .throttle = con_throttle,
3703 .unthrottle = con_unthrottle,
3704 .resize = vt_resize,
3705 .shutdown = con_shutdown,
3706 .cleanup = con_cleanup,
3707 .ldisc_ok = con_ldisc_ok,
3708 };
3709
3710 static struct cdev vc0_cdev;
3711
3712 static ssize_t show_tty_active(struct device *dev,
3713 struct device_attribute *attr, char *buf)
3714 {
3715 return sprintf(buf, "tty%d\n", fg_console + 1);
3716 }
3717 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3718
3719 static struct attribute *vt_dev_attrs[] = {
3720 &dev_attr_active.attr,
3721 NULL
3722 };
3723
3724 ATTRIBUTE_GROUPS(vt_dev);
3725
3726 int __init vty_init(const struct file_operations *console_fops)
3727 {
3728 cdev_init(&vc0_cdev, console_fops);
3729 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3730 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3731 panic("Couldn't register /dev/tty0 driver\n");
3732 tty0dev = device_create_with_groups(&tty_class, NULL,
3733 MKDEV(TTY_MAJOR, 0), NULL,
3734 vt_dev_groups, "tty0");
3735 if (IS_ERR(tty0dev))
3736 tty0dev = NULL;
3737
3738 vcs_init();
3739
3740 console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3741 TTY_DRIVER_RESET_TERMIOS);
3742 if (IS_ERR(console_driver))
3743 panic("Couldn't allocate console driver\n");
3744
3745 console_driver->name = "tty";
3746 console_driver->name_base = 1;
3747 console_driver->major = TTY_MAJOR;
3748 console_driver->minor_start = 1;
3749 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3750 console_driver->init_termios = tty_std_termios;
3751 if (default_utf8)
3752 console_driver->init_termios.c_iflag |= IUTF8;
3753 tty_set_operations(console_driver, &con_ops);
3754 if (tty_register_driver(console_driver))
3755 panic("Couldn't register console driver\n");
3756 kbd_init();
3757 console_map_init();
3758 #ifdef CONFIG_MDA_CONSOLE
3759 mda_console_init();
3760 #endif
3761 return 0;
3762 }
3763
3764 static const struct class vtconsole_class = {
3765 .name = "vtconsole",
3766 };
3767
3768 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3769 int deflt)
3770 {
3771 struct module *owner = csw->owner;
3772 const char *desc = NULL;
3773 struct con_driver *con_driver;
3774 int i, j = -1, k = -1, retval = -ENODEV;
3775
3776 if (!try_module_get(owner))
3777 return -ENODEV;
3778
3779 WARN_CONSOLE_UNLOCKED();
3780
3781 /* check if driver is registered */
3782 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3783 con_driver = &registered_con_driver[i];
3784
3785 if (con_driver->con == csw) {
3786 desc = con_driver->desc;
3787 retval = 0;
3788 break;
3789 }
3790 }
3791
3792 if (retval)
3793 goto err;
3794
3795 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3796 csw->con_startup();
3797 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3798 }
3799
3800 if (deflt) {
3801 if (conswitchp)
3802 module_put(conswitchp->owner);
3803
3804 __module_get(owner);
3805 conswitchp = csw;
3806 }
3807
3808 first = max(first, con_driver->first);
3809 last = min(last, con_driver->last);
3810
3811 for (i = first; i <= last; i++) {
3812 int old_was_color;
3813 struct vc_data *vc = vc_cons[i].d;
3814
3815 if (con_driver_map[i])
3816 module_put(con_driver_map[i]->owner);
3817 __module_get(owner);
3818 con_driver_map[i] = csw;
3819
3820 if (!vc || !vc->vc_sw)
3821 continue;
3822
3823 j = i;
3824
3825 if (con_is_visible(vc)) {
3826 k = i;
3827 save_screen(vc);
3828 }
3829
3830 old_was_color = vc->vc_can_do_color;
3831 vc->vc_sw->con_deinit(vc);
3832 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3833 visual_init(vc, i, false);
3834 set_origin(vc);
3835 update_attr(vc);
3836
3837 /* If the console changed between mono <-> color, then
3838 * the attributes in the screenbuf will be wrong. The
3839 * following resets all attributes to something sane.
3840 */
3841 if (old_was_color != vc->vc_can_do_color)
3842 clear_buffer_attributes(vc);
3843 }
3844
3845 pr_info("Console: switching ");
3846 if (!deflt)
3847 pr_cont("consoles %d-%d ", first + 1, last + 1);
3848 if (j >= 0) {
3849 struct vc_data *vc = vc_cons[j].d;
3850
3851 pr_cont("to %s %s %dx%d\n",
3852 vc->vc_can_do_color ? "colour" : "mono",
3853 desc, vc->vc_cols, vc->vc_rows);
3854
3855 if (k >= 0) {
3856 vc = vc_cons[k].d;
3857 update_screen(vc);
3858 }
3859 } else {
3860 pr_cont("to %s\n", desc);
3861 }
3862
3863 retval = 0;
3864 err:
3865 module_put(owner);
3866 return retval;
3867 };
3868
3869
3870 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3871 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3872 {
3873 struct module *owner = csw->owner;
3874 const struct consw *defcsw = NULL;
3875 struct con_driver *con_driver = NULL, *con_back = NULL;
3876 int i, retval = -ENODEV;
3877
3878 if (!try_module_get(owner))
3879 return -ENODEV;
3880
3881 WARN_CONSOLE_UNLOCKED();
3882
3883 /* check if driver is registered and if it is unbindable */
3884 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3885 con_driver = &registered_con_driver[i];
3886
3887 if (con_driver->con == csw &&
3888 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3889 retval = 0;
3890 break;
3891 }
3892 }
3893
3894 if (retval)
3895 goto err;
3896
3897 retval = -ENODEV;
3898
3899 /* check if backup driver exists */
3900 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3901 con_back = &registered_con_driver[i];
3902
3903 if (con_back->con && con_back->con != csw) {
3904 defcsw = con_back->con;
3905 retval = 0;
3906 break;
3907 }
3908 }
3909
3910 if (retval)
3911 goto err;
3912
3913 if (!con_is_bound(csw))
3914 goto err;
3915
3916 first = max(first, con_driver->first);
3917 last = min(last, con_driver->last);
3918
3919 for (i = first; i <= last; i++) {
3920 if (con_driver_map[i] == csw) {
3921 module_put(csw->owner);
3922 con_driver_map[i] = NULL;
3923 }
3924 }
3925
3926 if (!con_is_bound(defcsw)) {
3927 const struct consw *defconsw = conswitchp;
3928
3929 defcsw->con_startup();
3930 con_back->flag |= CON_DRIVER_FLAG_INIT;
3931 /*
3932 * vgacon may change the default driver to point
3933 * to dummycon, we restore it here...
3934 */
3935 conswitchp = defconsw;
3936 }
3937
3938 if (!con_is_bound(csw))
3939 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3940
3941 /* ignore return value, binding should not fail */
3942 do_bind_con_driver(defcsw, first, last, deflt);
3943 err:
3944 module_put(owner);
3945 return retval;
3946
3947 }
3948 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3949
3950 static int vt_bind(struct con_driver *con)
3951 {
3952 const struct consw *defcsw = NULL, *csw = NULL;
3953 int i, more = 1, first = -1, last = -1, deflt = 0;
3954
3955 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3956 goto err;
3957
3958 csw = con->con;
3959
3960 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3961 struct con_driver *con = &registered_con_driver[i];
3962
3963 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3964 defcsw = con->con;
3965 break;
3966 }
3967 }
3968
3969 if (!defcsw)
3970 goto err;
3971
3972 while (more) {
3973 more = 0;
3974
3975 for (i = con->first; i <= con->last; i++) {
3976 if (con_driver_map[i] == defcsw) {
3977 if (first == -1)
3978 first = i;
3979 last = i;
3980 more = 1;
3981 } else if (first != -1)
3982 break;
3983 }
3984
3985 if (first == 0 && last == MAX_NR_CONSOLES -1)
3986 deflt = 1;
3987
3988 if (first != -1)
3989 do_bind_con_driver(csw, first, last, deflt);
3990
3991 first = -1;
3992 last = -1;
3993 deflt = 0;
3994 }
3995
3996 err:
3997 return 0;
3998 }
3999
4000 static int vt_unbind(struct con_driver *con)
4001 {
4002 const struct consw *csw = NULL;
4003 int i, more = 1, first = -1, last = -1, deflt = 0;
4004 int ret;
4005
4006 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
4007 goto err;
4008
4009 csw = con->con;
4010
4011 while (more) {
4012 more = 0;
4013
4014 for (i = con->first; i <= con->last; i++) {
4015 if (con_driver_map[i] == csw) {
4016 if (first == -1)
4017 first = i;
4018 last = i;
4019 more = 1;
4020 } else if (first != -1)
4021 break;
4022 }
4023
4024 if (first == 0 && last == MAX_NR_CONSOLES -1)
4025 deflt = 1;
4026
4027 if (first != -1) {
4028 ret = do_unbind_con_driver(csw, first, last, deflt);
4029 if (ret != 0)
4030 return ret;
4031 }
4032
4033 first = -1;
4034 last = -1;
4035 deflt = 0;
4036 }
4037
4038 err:
4039 return 0;
4040 }
4041 #else
4042 static inline int vt_bind(struct con_driver *con)
4043 {
4044 return 0;
4045 }
4046 static inline int vt_unbind(struct con_driver *con)
4047 {
4048 return 0;
4049 }
4050 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
4051
4052 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
4053 const char *buf, size_t count)
4054 {
4055 struct con_driver *con = dev_get_drvdata(dev);
4056 int bind = simple_strtoul(buf, NULL, 0);
4057
4058 console_lock();
4059
4060 if (bind)
4061 vt_bind(con);
4062 else
4063 vt_unbind(con);
4064
4065 console_unlock();
4066
4067 return count;
4068 }
4069
4070 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
4071 char *buf)
4072 {
4073 struct con_driver *con = dev_get_drvdata(dev);
4074 int bind;
4075
4076 console_lock();
4077 bind = con_is_bound(con->con);
4078 console_unlock();
4079
4080 return sysfs_emit(buf, "%i\n", bind);
4081 }
4082
4083 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
4084 char *buf)
4085 {
4086 struct con_driver *con = dev_get_drvdata(dev);
4087
4088 return sysfs_emit(buf, "%s %s\n",
4089 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
4090 con->desc);
4091
4092 }
4093
4094 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
4095 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
4096
4097 static struct attribute *con_dev_attrs[] = {
4098 &dev_attr_bind.attr,
4099 &dev_attr_name.attr,
4100 NULL
4101 };
4102
4103 ATTRIBUTE_GROUPS(con_dev);
4104
4105 static int vtconsole_init_device(struct con_driver *con)
4106 {
4107 con->flag |= CON_DRIVER_FLAG_ATTR;
4108 return 0;
4109 }
4110
4111 static void vtconsole_deinit_device(struct con_driver *con)
4112 {
4113 con->flag &= ~CON_DRIVER_FLAG_ATTR;
4114 }
4115
4116 /**
4117 * con_is_bound - checks if driver is bound to the console
4118 * @csw: console driver
4119 *
4120 * RETURNS: zero if unbound, nonzero if bound
4121 *
4122 * Drivers can call this and if zero, they should release
4123 * all resources allocated on &consw.con_startup()
4124 */
4125 int con_is_bound(const struct consw *csw)
4126 {
4127 int i, bound = 0;
4128
4129 WARN_CONSOLE_UNLOCKED();
4130
4131 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4132 if (con_driver_map[i] == csw) {
4133 bound = 1;
4134 break;
4135 }
4136 }
4137
4138 return bound;
4139 }
4140 EXPORT_SYMBOL(con_is_bound);
4141
4142 /**
4143 * con_is_visible - checks whether the current console is visible
4144 * @vc: virtual console
4145 *
4146 * RETURNS: zero if not visible, nonzero if visible
4147 */
4148 bool con_is_visible(const struct vc_data *vc)
4149 {
4150 WARN_CONSOLE_UNLOCKED();
4151
4152 return *vc->vc_display_fg == vc;
4153 }
4154 EXPORT_SYMBOL(con_is_visible);
4155
4156 /**
4157 * con_debug_enter - prepare the console for the kernel debugger
4158 * @vc: virtual console
4159 *
4160 * Called when the console is taken over by the kernel debugger, this
4161 * function needs to save the current console state, then put the console
4162 * into a state suitable for the kernel debugger.
4163 */
4164 void con_debug_enter(struct vc_data *vc)
4165 {
4166 saved_fg_console = fg_console;
4167 saved_last_console = last_console;
4168 saved_want_console = want_console;
4169 saved_vc_mode = vc->vc_mode;
4170 saved_console_blanked = console_blanked;
4171 vc->vc_mode = KD_TEXT;
4172 console_blanked = 0;
4173 if (vc->vc_sw->con_debug_enter)
4174 vc->vc_sw->con_debug_enter(vc);
4175 #ifdef CONFIG_KGDB_KDB
4176 /* Set the initial LINES variable if it is not already set */
4177 if (vc->vc_rows < 999) {
4178 int linecount;
4179 char lns[4];
4180 const char *setargs[3] = {
4181 "set",
4182 "LINES",
4183 lns,
4184 };
4185 if (kdbgetintenv(setargs[0], &linecount)) {
4186 snprintf(lns, 4, "%i", vc->vc_rows);
4187 kdb_set(2, setargs);
4188 }
4189 }
4190 if (vc->vc_cols < 999) {
4191 int colcount;
4192 char cols[4];
4193 const char *setargs[3] = {
4194 "set",
4195 "COLUMNS",
4196 cols,
4197 };
4198 if (kdbgetintenv(setargs[0], &colcount)) {
4199 snprintf(cols, 4, "%i", vc->vc_cols);
4200 kdb_set(2, setargs);
4201 }
4202 }
4203 #endif /* CONFIG_KGDB_KDB */
4204 }
4205 EXPORT_SYMBOL_GPL(con_debug_enter);
4206
4207 /**
4208 * con_debug_leave - restore console state
4209 *
4210 * Restore the console state to what it was before the kernel debugger
4211 * was invoked.
4212 */
4213 void con_debug_leave(void)
4214 {
4215 struct vc_data *vc;
4216
4217 fg_console = saved_fg_console;
4218 last_console = saved_last_console;
4219 want_console = saved_want_console;
4220 console_blanked = saved_console_blanked;
4221 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4222
4223 vc = vc_cons[fg_console].d;
4224 if (vc->vc_sw->con_debug_leave)
4225 vc->vc_sw->con_debug_leave(vc);
4226 }
4227 EXPORT_SYMBOL_GPL(con_debug_leave);
4228
4229 static int do_register_con_driver(const struct consw *csw, int first, int last)
4230 {
4231 struct module *owner = csw->owner;
4232 struct con_driver *con_driver;
4233 const char *desc;
4234 int i, retval;
4235
4236 WARN_CONSOLE_UNLOCKED();
4237
4238 if (!try_module_get(owner))
4239 return -ENODEV;
4240
4241 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4242 con_driver = &registered_con_driver[i];
4243
4244 /* already registered */
4245 if (con_driver->con == csw) {
4246 retval = -EBUSY;
4247 goto err;
4248 }
4249 }
4250
4251 desc = csw->con_startup();
4252 if (!desc) {
4253 retval = -ENODEV;
4254 goto err;
4255 }
4256
4257 retval = -EINVAL;
4258
4259 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4260 con_driver = &registered_con_driver[i];
4261
4262 if (con_driver->con == NULL &&
4263 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4264 con_driver->con = csw;
4265 con_driver->desc = desc;
4266 con_driver->node = i;
4267 con_driver->flag = CON_DRIVER_FLAG_MODULE |
4268 CON_DRIVER_FLAG_INIT;
4269 con_driver->first = first;
4270 con_driver->last = last;
4271 retval = 0;
4272 break;
4273 }
4274 }
4275
4276 if (retval)
4277 goto err;
4278
4279 con_driver->dev =
4280 device_create_with_groups(&vtconsole_class, NULL,
4281 MKDEV(0, con_driver->node),
4282 con_driver, con_dev_groups,
4283 "vtcon%i", con_driver->node);
4284 if (IS_ERR(con_driver->dev)) {
4285 pr_warn("Unable to create device for %s; errno = %ld\n",
4286 con_driver->desc, PTR_ERR(con_driver->dev));
4287 con_driver->dev = NULL;
4288 } else {
4289 vtconsole_init_device(con_driver);
4290 }
4291
4292 err:
4293 module_put(owner);
4294 return retval;
4295 }
4296
4297
4298 /**
4299 * do_unregister_con_driver - unregister console driver from console layer
4300 * @csw: console driver
4301 *
4302 * DESCRIPTION: All drivers that registers to the console layer must
4303 * call this function upon exit, or if the console driver is in a state
4304 * where it won't be able to handle console services, such as the
4305 * framebuffer console without loaded framebuffer drivers.
4306 *
4307 * The driver must unbind first prior to unregistration.
4308 */
4309 int do_unregister_con_driver(const struct consw *csw)
4310 {
4311 int i;
4312
4313 /* cannot unregister a bound driver */
4314 if (con_is_bound(csw))
4315 return -EBUSY;
4316
4317 if (csw == conswitchp)
4318 return -EINVAL;
4319
4320 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4321 struct con_driver *con_driver = &registered_con_driver[i];
4322
4323 if (con_driver->con == csw) {
4324 /*
4325 * Defer the removal of the sysfs entries since that
4326 * will acquire the kernfs s_active lock and we can't
4327 * acquire this lock while holding the console lock:
4328 * the unbind sysfs entry imposes already the opposite
4329 * order. Reset con already here to prevent any later
4330 * lookup to succeed and mark this slot as zombie, so
4331 * it won't get reused until we complete the removal
4332 * in the deferred work.
4333 */
4334 con_driver->con = NULL;
4335 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4336 schedule_work(&con_driver_unregister_work);
4337
4338 return 0;
4339 }
4340 }
4341
4342 return -ENODEV;
4343 }
4344 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4345
4346 static void con_driver_unregister_callback(struct work_struct *ignored)
4347 {
4348 int i;
4349
4350 console_lock();
4351
4352 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4353 struct con_driver *con_driver = &registered_con_driver[i];
4354
4355 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4356 continue;
4357
4358 console_unlock();
4359
4360 vtconsole_deinit_device(con_driver);
4361 device_destroy(&vtconsole_class, MKDEV(0, con_driver->node));
4362
4363 console_lock();
4364
4365 if (WARN_ON_ONCE(con_driver->con))
4366 con_driver->con = NULL;
4367 con_driver->desc = NULL;
4368 con_driver->dev = NULL;
4369 con_driver->node = 0;
4370 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4371 con_driver->flag = 0;
4372 con_driver->first = 0;
4373 con_driver->last = 0;
4374 }
4375
4376 console_unlock();
4377 }
4378
4379 /*
4380 * If we support more console drivers, this function is used
4381 * when a driver wants to take over some existing consoles
4382 * and become default driver for newly opened ones.
4383 *
4384 * do_take_over_console is basically a register followed by bind
4385 */
4386 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4387 {
4388 int err;
4389
4390 err = do_register_con_driver(csw, first, last);
4391 /*
4392 * If we get an busy error we still want to bind the console driver
4393 * and return success, as we may have unbound the console driver
4394 * but not unregistered it.
4395 */
4396 if (err == -EBUSY)
4397 err = 0;
4398 if (!err)
4399 do_bind_con_driver(csw, first, last, deflt);
4400
4401 return err;
4402 }
4403 EXPORT_SYMBOL_GPL(do_take_over_console);
4404
4405
4406 /*
4407 * give_up_console is a wrapper to unregister_con_driver. It will only
4408 * work if driver is fully unbound.
4409 */
4410 void give_up_console(const struct consw *csw)
4411 {
4412 console_lock();
4413 do_unregister_con_driver(csw);
4414 console_unlock();
4415 }
4416 EXPORT_SYMBOL(give_up_console);
4417
4418 static int __init vtconsole_class_init(void)
4419 {
4420 int i;
4421
4422 i = class_register(&vtconsole_class);
4423 if (i)
4424 pr_warn("Unable to create vt console class; errno = %d\n", i);
4425
4426 /* Add system drivers to sysfs */
4427 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4428 struct con_driver *con = &registered_con_driver[i];
4429
4430 if (con->con && !con->dev) {
4431 con->dev =
4432 device_create_with_groups(&vtconsole_class, NULL,
4433 MKDEV(0, con->node),
4434 con, con_dev_groups,
4435 "vtcon%i", con->node);
4436
4437 if (IS_ERR(con->dev)) {
4438 pr_warn("Unable to create device for %s; errno = %ld\n",
4439 con->desc, PTR_ERR(con->dev));
4440 con->dev = NULL;
4441 } else {
4442 vtconsole_init_device(con);
4443 }
4444 }
4445 }
4446
4447 return 0;
4448 }
4449 postcore_initcall(vtconsole_class_init);
4450
4451 /*
4452 * Screen blanking
4453 */
4454
4455 static int set_vesa_blanking(u8 __user *mode_user)
4456 {
4457 u8 mode;
4458
4459 if (get_user(mode, mode_user))
4460 return -EFAULT;
4461
4462 console_lock();
4463 vesa_blank_mode = (mode <= VESA_BLANK_MAX) ? mode : VESA_NO_BLANKING;
4464 console_unlock();
4465
4466 return 0;
4467 }
4468
4469 void do_blank_screen(int entering_gfx)
4470 {
4471 struct vc_data *vc = vc_cons[fg_console].d;
4472 int i;
4473
4474 might_sleep();
4475
4476 WARN_CONSOLE_UNLOCKED();
4477
4478 if (console_blanked) {
4479 if (blank_state == blank_vesa_wait) {
4480 blank_state = blank_off;
4481 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4482 }
4483 return;
4484 }
4485
4486 /* entering graphics mode? */
4487 if (entering_gfx) {
4488 hide_cursor(vc);
4489 save_screen(vc);
4490 vc->vc_sw->con_blank(vc, VESA_VSYNC_SUSPEND, 1);
4491 console_blanked = fg_console + 1;
4492 blank_state = blank_off;
4493 set_origin(vc);
4494 return;
4495 }
4496
4497 blank_state = blank_off;
4498
4499 /* don't blank graphics */
4500 if (vc->vc_mode != KD_TEXT) {
4501 console_blanked = fg_console + 1;
4502 return;
4503 }
4504
4505 hide_cursor(vc);
4506 del_timer_sync(&console_timer);
4507 blank_timer_expired = 0;
4508
4509 save_screen(vc);
4510 /* In case we need to reset origin, blanking hook returns 1 */
4511 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? VESA_VSYNC_SUSPEND :
4512 (vesa_blank_mode + 1), 0);
4513 console_blanked = fg_console + 1;
4514 if (i)
4515 set_origin(vc);
4516
4517 if (console_blank_hook && console_blank_hook(1))
4518 return;
4519
4520 if (vesa_off_interval && vesa_blank_mode) {
4521 blank_state = blank_vesa_wait;
4522 mod_timer(&console_timer, jiffies + vesa_off_interval);
4523 }
4524 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4525 }
4526 EXPORT_SYMBOL(do_blank_screen);
4527
4528 /*
4529 * Called by timer as well as from vt_console_driver
4530 */
4531 void do_unblank_screen(int leaving_gfx)
4532 {
4533 struct vc_data *vc;
4534
4535 /* This should now always be called from a "sane" (read: can schedule)
4536 * context for the sake of the low level drivers, except in the special
4537 * case of oops_in_progress
4538 */
4539 if (!oops_in_progress)
4540 might_sleep();
4541
4542 WARN_CONSOLE_UNLOCKED();
4543
4544 ignore_poke = 0;
4545 if (!console_blanked)
4546 return;
4547 if (!vc_cons_allocated(fg_console)) {
4548 /* impossible */
4549 pr_warn("unblank_screen: tty %d not allocated ??\n",
4550 fg_console + 1);
4551 return;
4552 }
4553 vc = vc_cons[fg_console].d;
4554 if (vc->vc_mode != KD_TEXT)
4555 return; /* but leave console_blanked != 0 */
4556
4557 if (blankinterval) {
4558 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4559 blank_state = blank_normal_wait;
4560 }
4561
4562 console_blanked = 0;
4563 if (vc->vc_sw->con_blank(vc, VESA_NO_BLANKING, leaving_gfx))
4564 /* Low-level driver cannot restore -> do it ourselves */
4565 update_screen(vc);
4566 if (console_blank_hook)
4567 console_blank_hook(0);
4568 set_palette(vc);
4569 set_cursor(vc);
4570 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4571 }
4572 EXPORT_SYMBOL(do_unblank_screen);
4573
4574 /*
4575 * This is called by the outside world to cause a forced unblank, mostly for
4576 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4577 * call it with 1 as an argument and so force a mode restore... that may kill
4578 * X or at least garbage the screen but would also make the Oops visible...
4579 */
4580 static void unblank_screen(void)
4581 {
4582 do_unblank_screen(0);
4583 }
4584
4585 /*
4586 * We defer the timer blanking to work queue so it can take the console mutex
4587 * (console operations can still happen at irq time, but only from printk which
4588 * has the console mutex. Not perfect yet, but better than no locking
4589 */
4590 static void blank_screen_t(struct timer_list *unused)
4591 {
4592 blank_timer_expired = 1;
4593 schedule_work(&console_work);
4594 }
4595
4596 void poke_blanked_console(void)
4597 {
4598 WARN_CONSOLE_UNLOCKED();
4599
4600 /* Add this so we quickly catch whoever might call us in a non
4601 * safe context. Nowadays, unblank_screen() isn't to be called in
4602 * atomic contexts and is allowed to schedule (with the special case
4603 * of oops_in_progress, but that isn't of any concern for this
4604 * function. --BenH.
4605 */
4606 might_sleep();
4607
4608 /* This isn't perfectly race free, but a race here would be mostly harmless,
4609 * at worst, we'll do a spurious blank and it's unlikely
4610 */
4611 del_timer(&console_timer);
4612 blank_timer_expired = 0;
4613
4614 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4615 return;
4616 if (console_blanked)
4617 unblank_screen();
4618 else if (blankinterval) {
4619 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4620 blank_state = blank_normal_wait;
4621 }
4622 }
4623
4624 /*
4625 * Palettes
4626 */
4627
4628 static void set_palette(struct vc_data *vc)
4629 {
4630 WARN_CONSOLE_UNLOCKED();
4631
4632 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4633 vc->vc_sw->con_set_palette(vc, color_table);
4634 }
4635
4636 /*
4637 * Load palette into the DAC registers. arg points to a colour
4638 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4639 */
4640
4641 int con_set_cmap(unsigned char __user *arg)
4642 {
4643 int i, j, k;
4644 unsigned char colormap[3*16];
4645
4646 if (copy_from_user(colormap, arg, sizeof(colormap)))
4647 return -EFAULT;
4648
4649 console_lock();
4650 for (i = k = 0; i < 16; i++) {
4651 default_red[i] = colormap[k++];
4652 default_grn[i] = colormap[k++];
4653 default_blu[i] = colormap[k++];
4654 }
4655 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4656 if (!vc_cons_allocated(i))
4657 continue;
4658 for (j = k = 0; j < 16; j++) {
4659 vc_cons[i].d->vc_palette[k++] = default_red[j];
4660 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4661 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4662 }
4663 set_palette(vc_cons[i].d);
4664 }
4665 console_unlock();
4666
4667 return 0;
4668 }
4669
4670 int con_get_cmap(unsigned char __user *arg)
4671 {
4672 int i, k;
4673 unsigned char colormap[3*16];
4674
4675 console_lock();
4676 for (i = k = 0; i < 16; i++) {
4677 colormap[k++] = default_red[i];
4678 colormap[k++] = default_grn[i];
4679 colormap[k++] = default_blu[i];
4680 }
4681 console_unlock();
4682
4683 if (copy_to_user(arg, colormap, sizeof(colormap)))
4684 return -EFAULT;
4685
4686 return 0;
4687 }
4688
4689 void reset_palette(struct vc_data *vc)
4690 {
4691 int j, k;
4692 for (j=k=0; j<16; j++) {
4693 vc->vc_palette[k++] = default_red[j];
4694 vc->vc_palette[k++] = default_grn[j];
4695 vc->vc_palette[k++] = default_blu[j];
4696 }
4697 set_palette(vc);
4698 }
4699
4700 /*
4701 * Font switching
4702 *
4703 * Currently we only support fonts up to 128 pixels wide, at a maximum height
4704 * of 128 pixels. Userspace fontdata may have to be stored with 32 bytes
4705 * (shorts/ints, depending on width) reserved for each character which is
4706 * kinda wasty, but this is done in order to maintain compatibility with the
4707 * EGA/VGA fonts. It is up to the actual low-level console-driver convert data
4708 * into its favorite format (maybe we should add a `fontoffset' field to the
4709 * `display' structure so we won't have to convert the fontdata all the time.
4710 * /Jes
4711 */
4712
4713 #define max_font_width 64
4714 #define max_font_height 128
4715 #define max_font_glyphs 512
4716 #define max_font_size (max_font_glyphs*max_font_width*max_font_height)
4717
4718 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4719 {
4720 struct console_font font;
4721 int rc = -EINVAL;
4722 int c;
4723 unsigned int vpitch = op->op == KD_FONT_OP_GET_TALL ? op->height : 32;
4724
4725 if (vpitch > max_font_height)
4726 return -EINVAL;
4727
4728 if (op->data) {
4729 font.data = kvzalloc(max_font_size, GFP_KERNEL);
4730 if (!font.data)
4731 return -ENOMEM;
4732 } else
4733 font.data = NULL;
4734
4735 console_lock();
4736 if (vc->vc_mode != KD_TEXT)
4737 rc = -EINVAL;
4738 else if (vc->vc_sw->con_font_get)
4739 rc = vc->vc_sw->con_font_get(vc, &font, vpitch);
4740 else
4741 rc = -ENOSYS;
4742 console_unlock();
4743
4744 if (rc)
4745 goto out;
4746
4747 c = (font.width+7)/8 * vpitch * font.charcount;
4748
4749 if (op->data && font.charcount > op->charcount)
4750 rc = -ENOSPC;
4751 if (font.width > op->width || font.height > op->height)
4752 rc = -ENOSPC;
4753 if (rc)
4754 goto out;
4755
4756 op->height = font.height;
4757 op->width = font.width;
4758 op->charcount = font.charcount;
4759
4760 if (op->data && copy_to_user(op->data, font.data, c))
4761 rc = -EFAULT;
4762
4763 out:
4764 kvfree(font.data);
4765 return rc;
4766 }
4767
4768 static int con_font_set(struct vc_data *vc, const struct console_font_op *op)
4769 {
4770 struct console_font font;
4771 int rc = -EINVAL;
4772 int size;
4773 unsigned int vpitch = op->op == KD_FONT_OP_SET_TALL ? op->height : 32;
4774
4775 if (vc->vc_mode != KD_TEXT)
4776 return -EINVAL;
4777 if (!op->data)
4778 return -EINVAL;
4779 if (op->charcount > max_font_glyphs)
4780 return -EINVAL;
4781 if (op->width <= 0 || op->width > max_font_width || !op->height ||
4782 op->height > max_font_height)
4783 return -EINVAL;
4784 if (vpitch < op->height)
4785 return -EINVAL;
4786 size = (op->width+7)/8 * vpitch * op->charcount;
4787 if (size > max_font_size)
4788 return -ENOSPC;
4789
4790 font.data = memdup_user(op->data, size);
4791 if (IS_ERR(font.data))
4792 return PTR_ERR(font.data);
4793
4794 font.charcount = op->charcount;
4795 font.width = op->width;
4796 font.height = op->height;
4797
4798 console_lock();
4799 if (vc->vc_mode != KD_TEXT)
4800 rc = -EINVAL;
4801 else if (vc->vc_sw->con_font_set) {
4802 if (vc_is_sel(vc))
4803 clear_selection();
4804 rc = vc->vc_sw->con_font_set(vc, &font, vpitch, op->flags);
4805 } else
4806 rc = -ENOSYS;
4807 console_unlock();
4808 kfree(font.data);
4809 return rc;
4810 }
4811
4812 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4813 {
4814 struct console_font font = {.width = op->width, .height = op->height};
4815 char name[MAX_FONT_NAME];
4816 char *s = name;
4817 int rc;
4818
4819
4820 if (!op->data)
4821 s = NULL;
4822 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4823 return -EFAULT;
4824 else
4825 name[MAX_FONT_NAME - 1] = 0;
4826
4827 console_lock();
4828 if (vc->vc_mode != KD_TEXT) {
4829 console_unlock();
4830 return -EINVAL;
4831 }
4832 if (vc->vc_sw->con_font_default) {
4833 if (vc_is_sel(vc))
4834 clear_selection();
4835 rc = vc->vc_sw->con_font_default(vc, &font, s);
4836 } else
4837 rc = -ENOSYS;
4838 console_unlock();
4839 if (!rc) {
4840 op->width = font.width;
4841 op->height = font.height;
4842 }
4843 return rc;
4844 }
4845
4846 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4847 {
4848 switch (op->op) {
4849 case KD_FONT_OP_SET:
4850 case KD_FONT_OP_SET_TALL:
4851 return con_font_set(vc, op);
4852 case KD_FONT_OP_GET:
4853 case KD_FONT_OP_GET_TALL:
4854 return con_font_get(vc, op);
4855 case KD_FONT_OP_SET_DEFAULT:
4856 return con_font_default(vc, op);
4857 case KD_FONT_OP_COPY:
4858 /* was buggy and never really used */
4859 return -EINVAL;
4860 }
4861 return -ENOSYS;
4862 }
4863
4864 /*
4865 * Interface exported to selection and vcs.
4866 */
4867
4868 /* used by selection */
4869 u16 screen_glyph(const struct vc_data *vc, int offset)
4870 {
4871 u16 w = scr_readw(screenpos(vc, offset, true));
4872 u16 c = w & 0xff;
4873
4874 if (w & vc->vc_hi_font_mask)
4875 c |= 0x100;
4876 return c;
4877 }
4878 EXPORT_SYMBOL_GPL(screen_glyph);
4879
4880 u32 screen_glyph_unicode(const struct vc_data *vc, int n)
4881 {
4882 u32 **uni_lines = vc->vc_uni_lines;
4883
4884 if (uni_lines)
4885 return uni_lines[n / vc->vc_cols][n % vc->vc_cols];
4886
4887 return inverse_translate(vc, screen_glyph(vc, n * 2), true);
4888 }
4889 EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4890
4891 /* used by vcs - note the word offset */
4892 unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
4893 {
4894 return screenpos(vc, 2 * w_offset, viewed);
4895 }
4896 EXPORT_SYMBOL_GPL(screen_pos);
4897
4898 void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
4899 {
4900 /* clamp values if they don't fit */
4901 xy[0] = min(vc->state.x, 0xFFu);
4902 xy[1] = min(vc->state.y, 0xFFu);
4903 }
4904
4905 void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
4906 {
4907 hide_cursor(vc);
4908 gotoxy(vc, xy[0], xy[1]);
4909 set_cursor(vc);
4910 }
4911
4912 u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
4913 {
4914 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4915 return softcursor_original;
4916 return scr_readw(org);
4917 }
4918
4919 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4920 {
4921 scr_writew(val, org);
4922 if ((unsigned long)org == vc->vc_pos) {
4923 softcursor_original = -1;
4924 add_softcursor(vc);
4925 }
4926 }
4927
4928 void vcs_scr_updated(struct vc_data *vc)
4929 {
4930 notify_update(vc);
4931 }
Kernel DRM miscellaneous fixes and cross-tree changes