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(char __user *p);
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 int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
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
register_vt_notifier(struct notifier_block * nb)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
unregister_vt_notifier(struct notifier_block * nb)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
notify_write(struct vc_data * vc,unsigned int unicode)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, ¶m);
268 }
269
notify_update(struct vc_data * vc)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, ¶m);
274 }
275 /*
276 * Low-Level Functions
277 */
278
con_is_fg(const struct vc_data * vc)279 static inline bool con_is_fg(const struct vc_data *vc)
280 {
281 return vc->vc_num == fg_console;
282 }
283
con_should_update(const struct vc_data * vc)284 static inline bool con_should_update(const struct vc_data *vc)
285 {
286 return con_is_visible(vc) && !console_blanked;
287 }
288
screenpos(const struct vc_data * vc,int offset,bool viewed)289 static inline unsigned short *screenpos(const struct vc_data *vc, int offset,
290 bool viewed)
291 {
292 unsigned short *p;
293
294 if (!viewed)
295 p = (unsigned short *)(vc->vc_origin + offset);
296 else if (!vc->vc_sw->con_screen_pos)
297 p = (unsigned short *)(vc->vc_visible_origin + offset);
298 else
299 p = vc->vc_sw->con_screen_pos(vc, offset);
300 return p;
301 }
302
303 /* Called from the keyboard irq path.. */
scrolldelta(int lines)304 static inline void scrolldelta(int lines)
305 {
306 /* FIXME */
307 /* scrolldelta needs some kind of consistency lock, but the BKL was
308 and still is not protecting versus the scheduled back end */
309 scrollback_delta += lines;
310 schedule_console_callback();
311 }
312
schedule_console_callback(void)313 void schedule_console_callback(void)
314 {
315 schedule_work(&console_work);
316 }
317
318 /*
319 * Code to manage unicode-based screen buffers
320 */
321
322 /*
323 * Our screen buffer is preceded by an array of line pointers so that
324 * scrolling only implies some pointer shuffling.
325 */
326
vc_uniscr_alloc(unsigned int cols,unsigned int rows)327 static u32 **vc_uniscr_alloc(unsigned int cols, unsigned int rows)
328 {
329 u32 **uni_lines;
330 void *p;
331 unsigned int memsize, i, col_size = cols * sizeof(**uni_lines);
332
333 /* allocate everything in one go */
334 memsize = col_size * rows;
335 memsize += rows * sizeof(*uni_lines);
336 uni_lines = vzalloc(memsize);
337 if (!uni_lines)
338 return NULL;
339
340 /* initial line pointers */
341 p = uni_lines + rows;
342 for (i = 0; i < rows; i++) {
343 uni_lines[i] = p;
344 p += col_size;
345 }
346
347 return uni_lines;
348 }
349
vc_uniscr_free(u32 ** uni_lines)350 static void vc_uniscr_free(u32 **uni_lines)
351 {
352 vfree(uni_lines);
353 }
354
vc_uniscr_set(struct vc_data * vc,u32 ** new_uni_lines)355 static void vc_uniscr_set(struct vc_data *vc, u32 **new_uni_lines)
356 {
357 vc_uniscr_free(vc->vc_uni_lines);
358 vc->vc_uni_lines = new_uni_lines;
359 }
360
vc_uniscr_putc(struct vc_data * vc,u32 uc)361 static void vc_uniscr_putc(struct vc_data *vc, u32 uc)
362 {
363 if (vc->vc_uni_lines)
364 vc->vc_uni_lines[vc->state.y][vc->state.x] = uc;
365 }
366
vc_uniscr_insert(struct vc_data * vc,unsigned int nr)367 static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
368 {
369 if (vc->vc_uni_lines) {
370 u32 *ln = vc->vc_uni_lines[vc->state.y];
371 unsigned int x = vc->state.x, cols = vc->vc_cols;
372
373 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
374 memset32(&ln[x], ' ', nr);
375 }
376 }
377
vc_uniscr_delete(struct vc_data * vc,unsigned int nr)378 static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
379 {
380 if (vc->vc_uni_lines) {
381 u32 *ln = vc->vc_uni_lines[vc->state.y];
382 unsigned int x = vc->state.x, cols = vc->vc_cols;
383
384 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
385 memset32(&ln[cols - nr], ' ', nr);
386 }
387 }
388
vc_uniscr_clear_line(struct vc_data * vc,unsigned int x,unsigned int nr)389 static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
390 unsigned int nr)
391 {
392 if (vc->vc_uni_lines)
393 memset32(&vc->vc_uni_lines[vc->state.y][x], ' ', nr);
394 }
395
vc_uniscr_clear_lines(struct vc_data * vc,unsigned int y,unsigned int nr)396 static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
397 unsigned int nr)
398 {
399 if (vc->vc_uni_lines)
400 while (nr--)
401 memset32(vc->vc_uni_lines[y++], ' ', vc->vc_cols);
402 }
403
404 /* juggling array rotation algorithm (complexity O(N), size complexity O(1)) */
juggle_array(u32 ** array,unsigned int size,unsigned int nr)405 static void juggle_array(u32 **array, unsigned int size, unsigned int nr)
406 {
407 unsigned int gcd_idx;
408
409 for (gcd_idx = 0; gcd_idx < gcd(nr, size); gcd_idx++) {
410 u32 *gcd_idx_val = array[gcd_idx];
411 unsigned int dst_idx = gcd_idx;
412
413 while (1) {
414 unsigned int src_idx = (dst_idx + nr) % size;
415 if (src_idx == gcd_idx)
416 break;
417
418 array[dst_idx] = array[src_idx];
419 dst_idx = src_idx;
420 }
421
422 array[dst_idx] = gcd_idx_val;
423 }
424 }
425
vc_uniscr_scroll(struct vc_data * vc,unsigned int top,unsigned int bottom,enum con_scroll dir,unsigned int nr)426 static void vc_uniscr_scroll(struct vc_data *vc, unsigned int top,
427 unsigned int bottom, enum con_scroll dir,
428 unsigned int nr)
429 {
430 u32 **uni_lines = vc->vc_uni_lines;
431 unsigned int size = bottom - top;
432
433 if (!uni_lines)
434 return;
435
436 if (dir == SM_DOWN) {
437 juggle_array(&uni_lines[top], size, size - nr);
438 vc_uniscr_clear_lines(vc, top, nr);
439 } else {
440 juggle_array(&uni_lines[top], size, nr);
441 vc_uniscr_clear_lines(vc, bottom - nr, nr);
442 }
443 }
444
vc_uniscr_copy_area(u32 ** dst_lines,unsigned int dst_cols,unsigned int dst_rows,u32 ** src_lines,unsigned int src_cols,unsigned int src_top_row,unsigned int src_bot_row)445 static void vc_uniscr_copy_area(u32 **dst_lines,
446 unsigned int dst_cols,
447 unsigned int dst_rows,
448 u32 **src_lines,
449 unsigned int src_cols,
450 unsigned int src_top_row,
451 unsigned int src_bot_row)
452 {
453 unsigned int dst_row = 0;
454
455 if (!dst_lines)
456 return;
457
458 while (src_top_row < src_bot_row) {
459 u32 *src_line = src_lines[src_top_row];
460 u32 *dst_line = dst_lines[dst_row];
461
462 memcpy(dst_line, src_line, src_cols * sizeof(*src_line));
463 if (dst_cols - src_cols)
464 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
465 src_top_row++;
466 dst_row++;
467 }
468 while (dst_row < dst_rows) {
469 u32 *dst_line = dst_lines[dst_row];
470
471 memset32(dst_line, ' ', dst_cols);
472 dst_row++;
473 }
474 }
475
476 /*
477 * Called from vcs_read() to make sure unicode screen retrieval is possible.
478 * This will initialize the unicode screen buffer if not already done.
479 * This returns 0 if OK, or a negative error code otherwise.
480 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
481 */
vc_uniscr_check(struct vc_data * vc)482 int vc_uniscr_check(struct vc_data *vc)
483 {
484 u32 **uni_lines;
485 unsigned short *p;
486 int x, y, mask;
487
488 WARN_CONSOLE_UNLOCKED();
489
490 if (!vc->vc_utf)
491 return -ENODATA;
492
493 if (vc->vc_uni_lines)
494 return 0;
495
496 uni_lines = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
497 if (!uni_lines)
498 return -ENOMEM;
499
500 /*
501 * Let's populate it initially with (imperfect) reverse translation.
502 * This is the next best thing we can do short of having it enabled
503 * from the start even when no users rely on this functionality. True
504 * unicode content will be available after a complete screen refresh.
505 */
506 p = (unsigned short *)vc->vc_origin;
507 mask = vc->vc_hi_font_mask | 0xff;
508 for (y = 0; y < vc->vc_rows; y++) {
509 u32 *line = uni_lines[y];
510 for (x = 0; x < vc->vc_cols; x++) {
511 u16 glyph = scr_readw(p++) & mask;
512 line[x] = inverse_translate(vc, glyph, true);
513 }
514 }
515
516 vc->vc_uni_lines = uni_lines;
517
518 return 0;
519 }
520
521 /*
522 * Called from vcs_read() to get the unicode data from the screen.
523 * This must be preceded by a successful call to vc_uniscr_check() once
524 * the console lock has been taken.
525 */
vc_uniscr_copy_line(const struct vc_data * vc,void * dest,bool viewed,unsigned int row,unsigned int col,unsigned int nr)526 void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
527 unsigned int row, unsigned int col, unsigned int nr)
528 {
529 u32 **uni_lines = vc->vc_uni_lines;
530 int offset = row * vc->vc_size_row + col * 2;
531 unsigned long pos;
532
533 if (WARN_ON_ONCE(!uni_lines))
534 return;
535
536 pos = (unsigned long)screenpos(vc, offset, viewed);
537 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
538 /*
539 * Desired position falls in the main screen buffer.
540 * However the actual row/col might be different if
541 * scrollback is active.
542 */
543 row = (pos - vc->vc_origin) / vc->vc_size_row;
544 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
545 memcpy(dest, &uni_lines[row][col], nr * sizeof(u32));
546 } else {
547 /*
548 * Scrollback is active. For now let's simply backtranslate
549 * the screen glyphs until the unicode screen buffer does
550 * synchronize with console display drivers for a scrollback
551 * buffer of its own.
552 */
553 u16 *p = (u16 *)pos;
554 int mask = vc->vc_hi_font_mask | 0xff;
555 u32 *uni_buf = dest;
556 while (nr--) {
557 u16 glyph = scr_readw(p++) & mask;
558 *uni_buf++ = inverse_translate(vc, glyph, true);
559 }
560 }
561 }
562
con_scroll(struct vc_data * vc,unsigned int top,unsigned int bottom,enum con_scroll dir,unsigned int nr)563 static void con_scroll(struct vc_data *vc, unsigned int top,
564 unsigned int bottom, enum con_scroll dir,
565 unsigned int nr)
566 {
567 unsigned int rows = bottom - top;
568 u16 *clear, *dst, *src;
569
570 if (top + nr >= bottom)
571 nr = rows - 1;
572 if (bottom > vc->vc_rows || top >= bottom || nr < 1)
573 return;
574
575 vc_uniscr_scroll(vc, top, bottom, dir, nr);
576 if (con_is_visible(vc) &&
577 vc->vc_sw->con_scroll(vc, top, bottom, dir, nr))
578 return;
579
580 src = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * top);
581 dst = (u16 *)(vc->vc_origin + vc->vc_size_row * (top + nr));
582
583 if (dir == SM_UP) {
584 clear = src + (rows - nr) * vc->vc_cols;
585 swap(src, dst);
586 }
587 scr_memmovew(dst, src, (rows - nr) * vc->vc_size_row);
588 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
589 }
590
do_update_region(struct vc_data * vc,unsigned long start,int count)591 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
592 {
593 unsigned int xx, yy, offset;
594 u16 *p;
595
596 p = (u16 *) start;
597 if (!vc->vc_sw->con_getxy) {
598 offset = (start - vc->vc_origin) / 2;
599 xx = offset % vc->vc_cols;
600 yy = offset / vc->vc_cols;
601 } else {
602 int nxx, nyy;
603 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
604 xx = nxx; yy = nyy;
605 }
606 for(;;) {
607 u16 attrib = scr_readw(p) & 0xff00;
608 int startx = xx;
609 u16 *q = p;
610 while (xx < vc->vc_cols && count) {
611 if (attrib != (scr_readw(p) & 0xff00)) {
612 if (p > q)
613 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
614 startx = xx;
615 q = p;
616 attrib = scr_readw(p) & 0xff00;
617 }
618 p++;
619 xx++;
620 count--;
621 }
622 if (p > q)
623 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
624 if (!count)
625 break;
626 xx = 0;
627 yy++;
628 if (vc->vc_sw->con_getxy) {
629 p = (u16 *)start;
630 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
631 }
632 }
633 }
634
update_region(struct vc_data * vc,unsigned long start,int count)635 void update_region(struct vc_data *vc, unsigned long start, int count)
636 {
637 WARN_CONSOLE_UNLOCKED();
638
639 if (con_should_update(vc)) {
640 hide_cursor(vc);
641 do_update_region(vc, start, count);
642 set_cursor(vc);
643 }
644 }
645 EXPORT_SYMBOL(update_region);
646
647 /* Structure of attributes is hardware-dependent */
648
build_attr(struct vc_data * vc,u8 _color,enum vc_intensity _intensity,bool _blink,bool _underline,bool _reverse,bool _italic)649 static u8 build_attr(struct vc_data *vc, u8 _color,
650 enum vc_intensity _intensity, bool _blink, bool _underline,
651 bool _reverse, bool _italic)
652 {
653 if (vc->vc_sw->con_build_attr)
654 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
655 _blink, _underline, _reverse, _italic);
656
657 /*
658 * ++roman: I completely changed the attribute format for monochrome
659 * mode (!can_do_color). The formerly used MDA (monochrome display
660 * adapter) format didn't allow the combination of certain effects.
661 * Now the attribute is just a bit vector:
662 * Bit 0..1: intensity (0..2)
663 * Bit 2 : underline
664 * Bit 3 : reverse
665 * Bit 7 : blink
666 */
667 {
668 u8 a = _color;
669 if (!vc->vc_can_do_color)
670 return _intensity |
671 (_italic << 1) |
672 (_underline << 2) |
673 (_reverse << 3) |
674 (_blink << 7);
675 if (_italic)
676 a = (a & 0xF0) | vc->vc_itcolor;
677 else if (_underline)
678 a = (a & 0xf0) | vc->vc_ulcolor;
679 else if (_intensity == VCI_HALF_BRIGHT)
680 a = (a & 0xf0) | vc->vc_halfcolor;
681 if (_reverse)
682 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
683 if (_blink)
684 a ^= 0x80;
685 if (_intensity == VCI_BOLD)
686 a ^= 0x08;
687 if (vc->vc_hi_font_mask == 0x100)
688 a <<= 1;
689 return a;
690 }
691 }
692
update_attr(struct vc_data * vc)693 static void update_attr(struct vc_data *vc)
694 {
695 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
696 vc->state.blink, vc->state.underline,
697 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
698 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
699 VCI_NORMAL, vc->state.blink, false,
700 vc->vc_decscnm, false) << 8);
701 }
702
703 /* Note: inverting the screen twice should revert to the original state */
invert_screen(struct vc_data * vc,int offset,int count,bool viewed)704 void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
705 {
706 unsigned short *p;
707
708 WARN_CONSOLE_UNLOCKED();
709
710 count /= 2;
711 p = screenpos(vc, offset, viewed);
712 if (vc->vc_sw->con_invert_region) {
713 vc->vc_sw->con_invert_region(vc, p, count);
714 } else {
715 u16 *q = p;
716 int cnt = count;
717 u16 a;
718
719 if (!vc->vc_can_do_color) {
720 while (cnt--) {
721 a = scr_readw(q);
722 a ^= 0x0800;
723 scr_writew(a, q);
724 q++;
725 }
726 } else if (vc->vc_hi_font_mask == 0x100) {
727 while (cnt--) {
728 a = scr_readw(q);
729 a = (a & 0x11ff) |
730 ((a & 0xe000) >> 4) |
731 ((a & 0x0e00) << 4);
732 scr_writew(a, q);
733 q++;
734 }
735 } else {
736 while (cnt--) {
737 a = scr_readw(q);
738 a = (a & 0x88ff) |
739 ((a & 0x7000) >> 4) |
740 ((a & 0x0700) << 4);
741 scr_writew(a, q);
742 q++;
743 }
744 }
745 }
746
747 if (con_should_update(vc))
748 do_update_region(vc, (unsigned long) p, count);
749 notify_update(vc);
750 }
751
752 /* used by selection: complement pointer position */
complement_pos(struct vc_data * vc,int offset)753 void complement_pos(struct vc_data *vc, int offset)
754 {
755 static int old_offset = -1;
756 static unsigned short old;
757 static unsigned short oldx, oldy;
758
759 WARN_CONSOLE_UNLOCKED();
760
761 if (old_offset != -1 && old_offset >= 0 &&
762 old_offset < vc->vc_screenbuf_size) {
763 scr_writew(old, screenpos(vc, old_offset, true));
764 if (con_should_update(vc))
765 vc->vc_sw->con_putc(vc, old, oldy, oldx);
766 notify_update(vc);
767 }
768
769 old_offset = offset;
770
771 if (offset != -1 && offset >= 0 &&
772 offset < vc->vc_screenbuf_size) {
773 unsigned short new;
774 unsigned short *p;
775 p = screenpos(vc, offset, true);
776 old = scr_readw(p);
777 new = old ^ vc->vc_complement_mask;
778 scr_writew(new, p);
779 if (con_should_update(vc)) {
780 oldx = (offset >> 1) % vc->vc_cols;
781 oldy = (offset >> 1) / vc->vc_cols;
782 vc->vc_sw->con_putc(vc, new, oldy, oldx);
783 }
784 notify_update(vc);
785 }
786 }
787
insert_char(struct vc_data * vc,unsigned int nr)788 static void insert_char(struct vc_data *vc, unsigned int nr)
789 {
790 unsigned short *p = (unsigned short *) vc->vc_pos;
791
792 vc_uniscr_insert(vc, nr);
793 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
794 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
795 vc->vc_need_wrap = 0;
796 if (con_should_update(vc))
797 do_update_region(vc, (unsigned long) p,
798 vc->vc_cols - vc->state.x);
799 }
800
delete_char(struct vc_data * vc,unsigned int nr)801 static void delete_char(struct vc_data *vc, unsigned int nr)
802 {
803 unsigned short *p = (unsigned short *) vc->vc_pos;
804
805 vc_uniscr_delete(vc, nr);
806 scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
807 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
808 nr * 2);
809 vc->vc_need_wrap = 0;
810 if (con_should_update(vc))
811 do_update_region(vc, (unsigned long) p,
812 vc->vc_cols - vc->state.x);
813 }
814
815 static int softcursor_original = -1;
816
add_softcursor(struct vc_data * vc)817 static void add_softcursor(struct vc_data *vc)
818 {
819 int i = scr_readw((u16 *) vc->vc_pos);
820 u32 type = vc->vc_cursor_type;
821
822 if (!(type & CUR_SW))
823 return;
824 if (softcursor_original != -1)
825 return;
826 softcursor_original = i;
827 i |= CUR_SET(type);
828 i ^= CUR_CHANGE(type);
829 if ((type & CUR_ALWAYS_BG) &&
830 (softcursor_original & CUR_BG) == (i & CUR_BG))
831 i ^= CUR_BG;
832 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
833 i ^= CUR_FG;
834 scr_writew(i, (u16 *)vc->vc_pos);
835 if (con_should_update(vc))
836 vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x);
837 }
838
hide_softcursor(struct vc_data * vc)839 static void hide_softcursor(struct vc_data *vc)
840 {
841 if (softcursor_original != -1) {
842 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
843 if (con_should_update(vc))
844 vc->vc_sw->con_putc(vc, softcursor_original,
845 vc->state.y, vc->state.x);
846 softcursor_original = -1;
847 }
848 }
849
hide_cursor(struct vc_data * vc)850 static void hide_cursor(struct vc_data *vc)
851 {
852 if (vc_is_sel(vc))
853 clear_selection();
854
855 vc->vc_sw->con_cursor(vc, CM_ERASE);
856 hide_softcursor(vc);
857 }
858
set_cursor(struct vc_data * vc)859 static void set_cursor(struct vc_data *vc)
860 {
861 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
862 return;
863 if (vc->vc_deccm) {
864 if (vc_is_sel(vc))
865 clear_selection();
866 add_softcursor(vc);
867 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
868 vc->vc_sw->con_cursor(vc, CM_DRAW);
869 } else
870 hide_cursor(vc);
871 }
872
set_origin(struct vc_data * vc)873 static void set_origin(struct vc_data *vc)
874 {
875 WARN_CONSOLE_UNLOCKED();
876
877 if (!con_is_visible(vc) ||
878 !vc->vc_sw->con_set_origin ||
879 !vc->vc_sw->con_set_origin(vc))
880 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
881 vc->vc_visible_origin = vc->vc_origin;
882 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
883 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
884 2 * vc->state.x;
885 }
886
save_screen(struct vc_data * vc)887 static void save_screen(struct vc_data *vc)
888 {
889 WARN_CONSOLE_UNLOCKED();
890
891 if (vc->vc_sw->con_save_screen)
892 vc->vc_sw->con_save_screen(vc);
893 }
894
flush_scrollback(struct vc_data * vc)895 static void flush_scrollback(struct vc_data *vc)
896 {
897 WARN_CONSOLE_UNLOCKED();
898
899 set_origin(vc);
900 if (vc->vc_sw->con_flush_scrollback) {
901 vc->vc_sw->con_flush_scrollback(vc);
902 } else if (con_is_visible(vc)) {
903 /*
904 * When no con_flush_scrollback method is provided then the
905 * legacy way for flushing the scrollback buffer is to use
906 * a side effect of the con_switch method. We do it only on
907 * the foreground console as background consoles have no
908 * scrollback buffers in that case and we obviously don't
909 * want to switch to them.
910 */
911 hide_cursor(vc);
912 vc->vc_sw->con_switch(vc);
913 set_cursor(vc);
914 }
915 }
916
917 /*
918 * Redrawing of screen
919 */
920
clear_buffer_attributes(struct vc_data * vc)921 void clear_buffer_attributes(struct vc_data *vc)
922 {
923 unsigned short *p = (unsigned short *)vc->vc_origin;
924 int count = vc->vc_screenbuf_size / 2;
925 int mask = vc->vc_hi_font_mask | 0xff;
926
927 for (; count > 0; count--, p++) {
928 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
929 }
930 }
931
redraw_screen(struct vc_data * vc,int is_switch)932 void redraw_screen(struct vc_data *vc, int is_switch)
933 {
934 int redraw = 0;
935
936 WARN_CONSOLE_UNLOCKED();
937
938 if (!vc) {
939 /* strange ... */
940 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
941 return;
942 }
943
944 if (is_switch) {
945 struct vc_data *old_vc = vc_cons[fg_console].d;
946 if (old_vc == vc)
947 return;
948 if (!con_is_visible(vc))
949 redraw = 1;
950 *vc->vc_display_fg = vc;
951 fg_console = vc->vc_num;
952 hide_cursor(old_vc);
953 if (!con_is_visible(old_vc)) {
954 save_screen(old_vc);
955 set_origin(old_vc);
956 }
957 if (tty0dev)
958 sysfs_notify(&tty0dev->kobj, NULL, "active");
959 } else {
960 hide_cursor(vc);
961 redraw = 1;
962 }
963
964 if (redraw) {
965 int update;
966 int old_was_color = vc->vc_can_do_color;
967
968 set_origin(vc);
969 update = vc->vc_sw->con_switch(vc);
970 set_palette(vc);
971 /*
972 * If console changed from mono<->color, the best we can do
973 * is to clear the buffer attributes. As it currently stands,
974 * rebuilding new attributes from the old buffer is not doable
975 * without overly complex code.
976 */
977 if (old_was_color != vc->vc_can_do_color) {
978 update_attr(vc);
979 clear_buffer_attributes(vc);
980 }
981
982 if (update && vc->vc_mode != KD_GRAPHICS)
983 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
984 }
985 set_cursor(vc);
986 if (is_switch) {
987 vt_set_leds_compute_shiftstate();
988 notify_update(vc);
989 }
990 }
991 EXPORT_SYMBOL(redraw_screen);
992
993 /*
994 * Allocation, freeing and resizing of VTs.
995 */
996
vc_cons_allocated(unsigned int i)997 int vc_cons_allocated(unsigned int i)
998 {
999 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1000 }
1001
visual_init(struct vc_data * vc,int num,int init)1002 static void visual_init(struct vc_data *vc, int num, int init)
1003 {
1004 /* ++Geert: vc->vc_sw->con_init determines console size */
1005 if (vc->vc_sw)
1006 module_put(vc->vc_sw->owner);
1007 vc->vc_sw = conswitchp;
1008
1009 if (con_driver_map[num])
1010 vc->vc_sw = con_driver_map[num];
1011
1012 __module_get(vc->vc_sw->owner);
1013 vc->vc_num = num;
1014 vc->vc_display_fg = &master_display_fg;
1015 if (vc->uni_pagedict_loc)
1016 con_free_unimap(vc);
1017 vc->uni_pagedict_loc = &vc->uni_pagedict;
1018 vc->uni_pagedict = NULL;
1019 vc->vc_hi_font_mask = 0;
1020 vc->vc_complement_mask = 0;
1021 vc->vc_can_do_color = 0;
1022 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1023 vc->vc_sw->con_init(vc, init);
1024 if (!vc->vc_complement_mask)
1025 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1026 vc->vc_s_complement_mask = vc->vc_complement_mask;
1027 vc->vc_size_row = vc->vc_cols << 1;
1028 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1029 }
1030
1031
visual_deinit(struct vc_data * vc)1032 static void visual_deinit(struct vc_data *vc)
1033 {
1034 vc->vc_sw->con_deinit(vc);
1035 module_put(vc->vc_sw->owner);
1036 }
1037
vc_port_destruct(struct tty_port * port)1038 static void vc_port_destruct(struct tty_port *port)
1039 {
1040 struct vc_data *vc = container_of(port, struct vc_data, port);
1041
1042 kfree(vc);
1043 }
1044
1045 static const struct tty_port_operations vc_port_ops = {
1046 .destruct = vc_port_destruct,
1047 };
1048
1049 /*
1050 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1051 * [this is to be used together with some user program
1052 * like resize that changes the hardware videomode]
1053 */
1054 #define VC_MAXCOL (32767)
1055 #define VC_MAXROW (32767)
1056
vc_allocate(unsigned int currcons)1057 int vc_allocate(unsigned int currcons) /* return 0 on success */
1058 {
1059 struct vt_notifier_param param;
1060 struct vc_data *vc;
1061 int err;
1062
1063 WARN_CONSOLE_UNLOCKED();
1064
1065 if (currcons >= MAX_NR_CONSOLES)
1066 return -ENXIO;
1067
1068 if (vc_cons[currcons].d)
1069 return 0;
1070
1071 /* due to the granularity of kmalloc, we waste some memory here */
1072 /* the alloc is done in two steps, to optimize the common situation
1073 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1074 /* although the numbers above are not valid since long ago, the
1075 point is still up-to-date and the comment still has its value
1076 even if only as a historical artifact. --mj, July 1998 */
1077 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1078 if (!vc)
1079 return -ENOMEM;
1080
1081 vc_cons[currcons].d = vc;
1082 tty_port_init(&vc->port);
1083 vc->port.ops = &vc_port_ops;
1084 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1085
1086 visual_init(vc, currcons, 1);
1087
1088 if (!*vc->uni_pagedict_loc)
1089 con_set_default_unimap(vc);
1090
1091 err = -EINVAL;
1092 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1093 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1094 goto err_free;
1095 err = -ENOMEM;
1096 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1097 if (!vc->vc_screenbuf)
1098 goto err_free;
1099
1100 /* If no drivers have overridden us and the user didn't pass a
1101 boot option, default to displaying the cursor */
1102 if (global_cursor_default == -1)
1103 global_cursor_default = 1;
1104
1105 vc_init(vc, 1);
1106 vcs_make_sysfs(currcons);
1107 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
1108
1109 return 0;
1110 err_free:
1111 visual_deinit(vc);
1112 kfree(vc);
1113 vc_cons[currcons].d = NULL;
1114 return err;
1115 }
1116
resize_screen(struct vc_data * vc,int width,int height,int user)1117 static inline int resize_screen(struct vc_data *vc, int width, int height,
1118 int user)
1119 {
1120 /* Resizes the resolution of the display adapater */
1121 int err = 0;
1122
1123 if (vc->vc_sw->con_resize)
1124 err = vc->vc_sw->con_resize(vc, width, height, user);
1125
1126 return err;
1127 }
1128
1129 /**
1130 * vc_do_resize - resizing method for the tty
1131 * @tty: tty being resized
1132 * @vc: virtual console private data
1133 * @cols: columns
1134 * @lines: lines
1135 *
1136 * Resize a virtual console, clipping according to the actual constraints.
1137 * If the caller passes a tty structure then update the termios winsize
1138 * information and perform any necessary signal handling.
1139 *
1140 * Caller must hold the console semaphore. Takes the termios rwsem and
1141 * ctrl.lock of the tty IFF a tty is passed.
1142 */
1143
vc_do_resize(struct tty_struct * tty,struct vc_data * vc,unsigned int cols,unsigned int lines)1144 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1145 unsigned int cols, unsigned int lines)
1146 {
1147 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1148 unsigned long end;
1149 unsigned int old_rows, old_row_size, first_copied_row;
1150 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1151 unsigned int user;
1152 unsigned short *oldscreen, *newscreen;
1153 u32 **new_uniscr = NULL;
1154
1155 WARN_CONSOLE_UNLOCKED();
1156
1157 if (!vc)
1158 return -ENXIO;
1159
1160 user = vc->vc_resize_user;
1161 vc->vc_resize_user = 0;
1162
1163 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1164 return -EINVAL;
1165
1166 new_cols = (cols ? cols : vc->vc_cols);
1167 new_rows = (lines ? lines : vc->vc_rows);
1168 new_row_size = new_cols << 1;
1169 new_screen_size = new_row_size * new_rows;
1170
1171 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1172 /*
1173 * This function is being called here to cover the case
1174 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1175 * passing the same fb_var_screeninfo containing the fields
1176 * yres/xres equal to a number non-multiple of vc_font.height
1177 * and yres_virtual/xres_virtual equal to number lesser than the
1178 * vc_font.height and yres/xres.
1179 * In the second call, the struct fb_var_screeninfo isn't
1180 * being modified by the underlying driver because of the
1181 * if above, and this causes the fbcon_display->vrows to become
1182 * negative and it eventually leads to out-of-bound
1183 * access by the imageblit function.
1184 * To give the correct values to the struct and to not have
1185 * to deal with possible errors from the code below, we call
1186 * the resize_screen here as well.
1187 */
1188 return resize_screen(vc, new_cols, new_rows, user);
1189 }
1190
1191 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1192 return -EINVAL;
1193 newscreen = kzalloc(new_screen_size, GFP_USER);
1194 if (!newscreen)
1195 return -ENOMEM;
1196
1197 if (vc->vc_uni_lines) {
1198 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1199 if (!new_uniscr) {
1200 kfree(newscreen);
1201 return -ENOMEM;
1202 }
1203 }
1204
1205 if (vc_is_sel(vc))
1206 clear_selection();
1207
1208 old_rows = vc->vc_rows;
1209 old_row_size = vc->vc_size_row;
1210
1211 err = resize_screen(vc, new_cols, new_rows, user);
1212 if (err) {
1213 kfree(newscreen);
1214 vc_uniscr_free(new_uniscr);
1215 return err;
1216 }
1217
1218 vc->vc_rows = new_rows;
1219 vc->vc_cols = new_cols;
1220 vc->vc_size_row = new_row_size;
1221 vc->vc_screenbuf_size = new_screen_size;
1222
1223 rlth = min(old_row_size, new_row_size);
1224 rrem = new_row_size - rlth;
1225 old_origin = vc->vc_origin;
1226 new_origin = (long) newscreen;
1227 new_scr_end = new_origin + new_screen_size;
1228
1229 if (vc->state.y > new_rows) {
1230 if (old_rows - vc->state.y < new_rows) {
1231 /*
1232 * Cursor near the bottom, copy contents from the
1233 * bottom of buffer
1234 */
1235 first_copied_row = (old_rows - new_rows);
1236 } else {
1237 /*
1238 * Cursor is in no man's land, copy 1/2 screenful
1239 * from the top and bottom of cursor position
1240 */
1241 first_copied_row = (vc->state.y - new_rows/2);
1242 }
1243 old_origin += first_copied_row * old_row_size;
1244 } else
1245 first_copied_row = 0;
1246 end = old_origin + old_row_size * min(old_rows, new_rows);
1247
1248 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1249 vc->vc_uni_lines, rlth/2, first_copied_row,
1250 min(old_rows, new_rows));
1251 vc_uniscr_set(vc, new_uniscr);
1252
1253 update_attr(vc);
1254
1255 while (old_origin < end) {
1256 scr_memcpyw((unsigned short *) new_origin,
1257 (unsigned short *) old_origin, rlth);
1258 if (rrem)
1259 scr_memsetw((void *)(new_origin + rlth),
1260 vc->vc_video_erase_char, rrem);
1261 old_origin += old_row_size;
1262 new_origin += new_row_size;
1263 }
1264 if (new_scr_end > new_origin)
1265 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1266 new_scr_end - new_origin);
1267 oldscreen = vc->vc_screenbuf;
1268 vc->vc_screenbuf = newscreen;
1269 vc->vc_screenbuf_size = new_screen_size;
1270 set_origin(vc);
1271 kfree(oldscreen);
1272
1273 /* do part of a reset_terminal() */
1274 vc->vc_top = 0;
1275 vc->vc_bottom = vc->vc_rows;
1276 gotoxy(vc, vc->state.x, vc->state.y);
1277 save_cur(vc);
1278
1279 if (tty) {
1280 /* Rewrite the requested winsize data with the actual
1281 resulting sizes */
1282 struct winsize ws;
1283 memset(&ws, 0, sizeof(ws));
1284 ws.ws_row = vc->vc_rows;
1285 ws.ws_col = vc->vc_cols;
1286 ws.ws_ypixel = vc->vc_scan_lines;
1287 tty_do_resize(tty, &ws);
1288 }
1289
1290 if (con_is_visible(vc))
1291 update_screen(vc);
1292 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1293 notify_update(vc);
1294 return err;
1295 }
1296
1297 /**
1298 * vc_resize - resize a VT
1299 * @vc: virtual console
1300 * @cols: columns
1301 * @rows: rows
1302 *
1303 * Resize a virtual console as seen from the console end of things. We
1304 * use the common vc_do_resize methods to update the structures. The
1305 * caller must hold the console sem to protect console internals and
1306 * vc->port.tty
1307 */
1308
vc_resize(struct vc_data * vc,unsigned int cols,unsigned int rows)1309 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1310 {
1311 return vc_do_resize(vc->port.tty, vc, cols, rows);
1312 }
1313 EXPORT_SYMBOL(vc_resize);
1314
1315 /**
1316 * vt_resize - resize a VT
1317 * @tty: tty to resize
1318 * @ws: winsize attributes
1319 *
1320 * Resize a virtual terminal. This is called by the tty layer as we
1321 * register our own handler for resizing. The mutual helper does all
1322 * the actual work.
1323 *
1324 * Takes the console sem and the called methods then take the tty
1325 * termios_rwsem and the tty ctrl.lock in that order.
1326 */
vt_resize(struct tty_struct * tty,struct winsize * ws)1327 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1328 {
1329 struct vc_data *vc = tty->driver_data;
1330 int ret;
1331
1332 console_lock();
1333 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1334 console_unlock();
1335 return ret;
1336 }
1337
vc_deallocate(unsigned int currcons)1338 struct vc_data *vc_deallocate(unsigned int currcons)
1339 {
1340 struct vc_data *vc = NULL;
1341
1342 WARN_CONSOLE_UNLOCKED();
1343
1344 if (vc_cons_allocated(currcons)) {
1345 struct vt_notifier_param param;
1346
1347 param.vc = vc = vc_cons[currcons].d;
1348 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1349 vcs_remove_sysfs(currcons);
1350 visual_deinit(vc);
1351 con_free_unimap(vc);
1352 put_pid(vc->vt_pid);
1353 vc_uniscr_set(vc, NULL);
1354 kfree(vc->vc_screenbuf);
1355 vc_cons[currcons].d = NULL;
1356 }
1357 return vc;
1358 }
1359
1360 /*
1361 * VT102 emulator
1362 */
1363
1364 enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1365
1366 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1367 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1368 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1369
1370 #define decarm VC_REPEAT
1371 #define decckm VC_CKMODE
1372 #define kbdapplic VC_APPLIC
1373 #define lnm VC_CRLF
1374
1375 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1376 8,12,10,14, 9,13,11,15 };
1377 EXPORT_SYMBOL(color_table);
1378
1379 /* the default colour table, for VGA+ colour systems */
1380 unsigned char default_red[] = {
1381 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1382 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1383 };
1384 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1385 EXPORT_SYMBOL(default_red);
1386
1387 unsigned char default_grn[] = {
1388 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1389 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1390 };
1391 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1392 EXPORT_SYMBOL(default_grn);
1393
1394 unsigned char default_blu[] = {
1395 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1396 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1397 };
1398 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1399 EXPORT_SYMBOL(default_blu);
1400
1401 /*
1402 * gotoxy() must verify all boundaries, because the arguments
1403 * might also be negative. If the given position is out of
1404 * bounds, the cursor is placed at the nearest margin.
1405 */
gotoxy(struct vc_data * vc,int new_x,int new_y)1406 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1407 {
1408 int min_y, max_y;
1409
1410 if (new_x < 0)
1411 vc->state.x = 0;
1412 else {
1413 if (new_x >= vc->vc_cols)
1414 vc->state.x = vc->vc_cols - 1;
1415 else
1416 vc->state.x = new_x;
1417 }
1418
1419 if (vc->vc_decom) {
1420 min_y = vc->vc_top;
1421 max_y = vc->vc_bottom;
1422 } else {
1423 min_y = 0;
1424 max_y = vc->vc_rows;
1425 }
1426 if (new_y < min_y)
1427 vc->state.y = min_y;
1428 else if (new_y >= max_y)
1429 vc->state.y = max_y - 1;
1430 else
1431 vc->state.y = new_y;
1432 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1433 (vc->state.x << 1);
1434 vc->vc_need_wrap = 0;
1435 }
1436
1437 /* for absolute user moves, when decom is set */
gotoxay(struct vc_data * vc,int new_x,int new_y)1438 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1439 {
1440 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1441 }
1442
scrollback(struct vc_data * vc)1443 void scrollback(struct vc_data *vc)
1444 {
1445 scrolldelta(-(vc->vc_rows / 2));
1446 }
1447
scrollfront(struct vc_data * vc,int lines)1448 void scrollfront(struct vc_data *vc, int lines)
1449 {
1450 if (!lines)
1451 lines = vc->vc_rows / 2;
1452 scrolldelta(lines);
1453 }
1454
lf(struct vc_data * vc)1455 static void lf(struct vc_data *vc)
1456 {
1457 /* don't scroll if above bottom of scrolling region, or
1458 * if below scrolling region
1459 */
1460 if (vc->state.y + 1 == vc->vc_bottom)
1461 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1462 else if (vc->state.y < vc->vc_rows - 1) {
1463 vc->state.y++;
1464 vc->vc_pos += vc->vc_size_row;
1465 }
1466 vc->vc_need_wrap = 0;
1467 notify_write(vc, '\n');
1468 }
1469
ri(struct vc_data * vc)1470 static void ri(struct vc_data *vc)
1471 {
1472 /* don't scroll if below top of scrolling region, or
1473 * if above scrolling region
1474 */
1475 if (vc->state.y == vc->vc_top)
1476 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1477 else if (vc->state.y > 0) {
1478 vc->state.y--;
1479 vc->vc_pos -= vc->vc_size_row;
1480 }
1481 vc->vc_need_wrap = 0;
1482 }
1483
cr(struct vc_data * vc)1484 static inline void cr(struct vc_data *vc)
1485 {
1486 vc->vc_pos -= vc->state.x << 1;
1487 vc->vc_need_wrap = vc->state.x = 0;
1488 notify_write(vc, '\r');
1489 }
1490
bs(struct vc_data * vc)1491 static inline void bs(struct vc_data *vc)
1492 {
1493 if (vc->state.x) {
1494 vc->vc_pos -= 2;
1495 vc->state.x--;
1496 vc->vc_need_wrap = 0;
1497 notify_write(vc, '\b');
1498 }
1499 }
1500
del(struct vc_data * vc)1501 static inline void del(struct vc_data *vc)
1502 {
1503 /* ignored */
1504 }
1505
csi_J(struct vc_data * vc,int vpar)1506 static void csi_J(struct vc_data *vc, int vpar)
1507 {
1508 unsigned int count;
1509 unsigned short * start;
1510
1511 switch (vpar) {
1512 case 0: /* erase from cursor to end of display */
1513 vc_uniscr_clear_line(vc, vc->state.x,
1514 vc->vc_cols - vc->state.x);
1515 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1516 vc->vc_rows - vc->state.y - 1);
1517 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1518 start = (unsigned short *)vc->vc_pos;
1519 break;
1520 case 1: /* erase from start to cursor */
1521 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1522 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1523 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1524 start = (unsigned short *)vc->vc_origin;
1525 break;
1526 case 3: /* include scrollback */
1527 flush_scrollback(vc);
1528 fallthrough;
1529 case 2: /* erase whole display */
1530 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1531 count = vc->vc_cols * vc->vc_rows;
1532 start = (unsigned short *)vc->vc_origin;
1533 break;
1534 default:
1535 return;
1536 }
1537 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1538 if (con_should_update(vc))
1539 do_update_region(vc, (unsigned long) start, count);
1540 vc->vc_need_wrap = 0;
1541 }
1542
csi_K(struct vc_data * vc,int vpar)1543 static void csi_K(struct vc_data *vc, int vpar)
1544 {
1545 unsigned int count;
1546 unsigned short *start = (unsigned short *)vc->vc_pos;
1547 int offset;
1548
1549 switch (vpar) {
1550 case 0: /* erase from cursor to end of line */
1551 offset = 0;
1552 count = vc->vc_cols - vc->state.x;
1553 break;
1554 case 1: /* erase from start of line to cursor */
1555 offset = -vc->state.x;
1556 count = vc->state.x + 1;
1557 break;
1558 case 2: /* erase whole line */
1559 offset = -vc->state.x;
1560 count = vc->vc_cols;
1561 break;
1562 default:
1563 return;
1564 }
1565 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
1566 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1567 vc->vc_need_wrap = 0;
1568 if (con_should_update(vc))
1569 do_update_region(vc, (unsigned long)(start + offset), count);
1570 }
1571
1572 /* erase the following vpar positions */
csi_X(struct vc_data * vc,unsigned int vpar)1573 static void csi_X(struct vc_data *vc, unsigned int vpar)
1574 { /* not vt100? */
1575 unsigned int count;
1576
1577 if (!vpar)
1578 vpar++;
1579
1580 count = min(vpar, vc->vc_cols - vc->state.x);
1581
1582 vc_uniscr_clear_line(vc, vc->state.x, count);
1583 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1584 if (con_should_update(vc))
1585 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
1586 vc->vc_need_wrap = 0;
1587 }
1588
default_attr(struct vc_data * vc)1589 static void default_attr(struct vc_data *vc)
1590 {
1591 vc->state.intensity = VCI_NORMAL;
1592 vc->state.italic = false;
1593 vc->state.underline = false;
1594 vc->state.reverse = false;
1595 vc->state.blink = false;
1596 vc->state.color = vc->vc_def_color;
1597 }
1598
1599 struct rgb { u8 r; u8 g; u8 b; };
1600
rgb_from_256(int i,struct rgb * c)1601 static void rgb_from_256(int i, struct rgb *c)
1602 {
1603 if (i < 8) { /* Standard colours. */
1604 c->r = i&1 ? 0xaa : 0x00;
1605 c->g = i&2 ? 0xaa : 0x00;
1606 c->b = i&4 ? 0xaa : 0x00;
1607 } else if (i < 16) {
1608 c->r = i&1 ? 0xff : 0x55;
1609 c->g = i&2 ? 0xff : 0x55;
1610 c->b = i&4 ? 0xff : 0x55;
1611 } else if (i < 232) { /* 6x6x6 colour cube. */
1612 c->r = (i - 16) / 36 * 85 / 2;
1613 c->g = (i - 16) / 6 % 6 * 85 / 2;
1614 c->b = (i - 16) % 6 * 85 / 2;
1615 } else /* Grayscale ramp. */
1616 c->r = c->g = c->b = i * 10 - 2312;
1617 }
1618
rgb_foreground(struct vc_data * vc,const struct rgb * c)1619 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1620 {
1621 u8 hue = 0, max = max3(c->r, c->g, c->b);
1622
1623 if (c->r > max / 2)
1624 hue |= 4;
1625 if (c->g > max / 2)
1626 hue |= 2;
1627 if (c->b > max / 2)
1628 hue |= 1;
1629
1630 if (hue == 7 && max <= 0x55) {
1631 hue = 0;
1632 vc->state.intensity = VCI_BOLD;
1633 } else if (max > 0xaa)
1634 vc->state.intensity = VCI_BOLD;
1635 else
1636 vc->state.intensity = VCI_NORMAL;
1637
1638 vc->state.color = (vc->state.color & 0xf0) | hue;
1639 }
1640
rgb_background(struct vc_data * vc,const struct rgb * c)1641 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1642 {
1643 /* For backgrounds, err on the dark side. */
1644 vc->state.color = (vc->state.color & 0x0f)
1645 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1646 }
1647
1648 /*
1649 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1650 * and thus need to be detected and ignored by hand. That standard also
1651 * wants : rather than ; as separators but sequences containing : are currently
1652 * completely ignored by the parser.
1653 *
1654 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1655 * supporting them.
1656 */
vc_t416_color(struct vc_data * vc,int i,void (* set_color)(struct vc_data * vc,const struct rgb * c))1657 static int vc_t416_color(struct vc_data *vc, int i,
1658 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1659 {
1660 struct rgb c;
1661
1662 i++;
1663 if (i > vc->vc_npar)
1664 return i;
1665
1666 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1667 /* 256 colours */
1668 i++;
1669 rgb_from_256(vc->vc_par[i], &c);
1670 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1671 /* 24 bit */
1672 c.r = vc->vc_par[i + 1];
1673 c.g = vc->vc_par[i + 2];
1674 c.b = vc->vc_par[i + 3];
1675 i += 3;
1676 } else
1677 return i;
1678
1679 set_color(vc, &c);
1680
1681 return i;
1682 }
1683
1684 /* console_lock is held */
csi_m(struct vc_data * vc)1685 static void csi_m(struct vc_data *vc)
1686 {
1687 int i;
1688
1689 for (i = 0; i <= vc->vc_npar; i++)
1690 switch (vc->vc_par[i]) {
1691 case 0: /* all attributes off */
1692 default_attr(vc);
1693 break;
1694 case 1:
1695 vc->state.intensity = VCI_BOLD;
1696 break;
1697 case 2:
1698 vc->state.intensity = VCI_HALF_BRIGHT;
1699 break;
1700 case 3:
1701 vc->state.italic = true;
1702 break;
1703 case 21:
1704 /*
1705 * No console drivers support double underline, so
1706 * convert it to a single underline.
1707 */
1708 case 4:
1709 vc->state.underline = true;
1710 break;
1711 case 5:
1712 vc->state.blink = true;
1713 break;
1714 case 7:
1715 vc->state.reverse = true;
1716 break;
1717 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1718 * Select primary font, don't display control chars if
1719 * defined, don't set bit 8 on output.
1720 */
1721 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
1722 vc->vc_disp_ctrl = 0;
1723 vc->vc_toggle_meta = 0;
1724 break;
1725 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1726 * Select first alternate font, lets chars < 32 be
1727 * displayed as ROM chars.
1728 */
1729 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1730 vc->vc_disp_ctrl = 1;
1731 vc->vc_toggle_meta = 0;
1732 break;
1733 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1734 * Select second alternate font, toggle high bit
1735 * before displaying as ROM char.
1736 */
1737 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1738 vc->vc_disp_ctrl = 1;
1739 vc->vc_toggle_meta = 1;
1740 break;
1741 case 22:
1742 vc->state.intensity = VCI_NORMAL;
1743 break;
1744 case 23:
1745 vc->state.italic = false;
1746 break;
1747 case 24:
1748 vc->state.underline = false;
1749 break;
1750 case 25:
1751 vc->state.blink = false;
1752 break;
1753 case 27:
1754 vc->state.reverse = false;
1755 break;
1756 case 38:
1757 i = vc_t416_color(vc, i, rgb_foreground);
1758 break;
1759 case 48:
1760 i = vc_t416_color(vc, i, rgb_background);
1761 break;
1762 case 39:
1763 vc->state.color = (vc->vc_def_color & 0x0f) |
1764 (vc->state.color & 0xf0);
1765 break;
1766 case 49:
1767 vc->state.color = (vc->vc_def_color & 0xf0) |
1768 (vc->state.color & 0x0f);
1769 break;
1770 default:
1771 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1772 if (vc->vc_par[i] < 100)
1773 vc->state.intensity = VCI_BOLD;
1774 vc->vc_par[i] -= 60;
1775 }
1776 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1777 vc->state.color = color_table[vc->vc_par[i] - 30]
1778 | (vc->state.color & 0xf0);
1779 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1780 vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
1781 | (vc->state.color & 0x0f);
1782 break;
1783 }
1784 update_attr(vc);
1785 }
1786
respond_string(const char * p,size_t len,struct tty_port * port)1787 static void respond_string(const char *p, size_t len, struct tty_port *port)
1788 {
1789 tty_insert_flip_string(port, p, len);
1790 tty_flip_buffer_push(port);
1791 }
1792
cursor_report(struct vc_data * vc,struct tty_struct * tty)1793 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1794 {
1795 char buf[40];
1796 int len;
1797
1798 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1799 (vc->vc_decom ? vc->vc_top + 1 : 1),
1800 vc->state.x + 1);
1801 respond_string(buf, len, tty->port);
1802 }
1803
status_report(struct tty_struct * tty)1804 static inline void status_report(struct tty_struct *tty)
1805 {
1806 static const char teminal_ok[] = "\033[0n";
1807
1808 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1809 }
1810
respond_ID(struct tty_struct * tty)1811 static inline void respond_ID(struct tty_struct *tty)
1812 {
1813 /* terminal answer to an ESC-Z or csi0c query. */
1814 static const char vt102_id[] = "\033[?6c";
1815
1816 respond_string(vt102_id, strlen(vt102_id), tty->port);
1817 }
1818
mouse_report(struct tty_struct * tty,int butt,int mrx,int mry)1819 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1820 {
1821 char buf[8];
1822 int len;
1823
1824 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1825 (char)('!' + mrx), (char)('!' + mry));
1826 respond_string(buf, len, tty->port);
1827 }
1828
1829 /* invoked via ioctl(TIOCLINUX) and through set_selection_user */
mouse_reporting(void)1830 int mouse_reporting(void)
1831 {
1832 return vc_cons[fg_console].d->vc_report_mouse;
1833 }
1834
1835 /* console_lock is held */
set_mode(struct vc_data * vc,int on_off)1836 static void set_mode(struct vc_data *vc, int on_off)
1837 {
1838 int i;
1839
1840 for (i = 0; i <= vc->vc_npar; i++)
1841 if (vc->vc_priv == EPdec) {
1842 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1843 case 1: /* Cursor keys send ^[Ox/^[[x */
1844 if (on_off)
1845 set_kbd(vc, decckm);
1846 else
1847 clr_kbd(vc, decckm);
1848 break;
1849 case 3: /* 80/132 mode switch unimplemented */
1850 #if 0
1851 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1852 /* this alone does not suffice; some user mode
1853 utility has to change the hardware regs */
1854 #endif
1855 break;
1856 case 5: /* Inverted screen on/off */
1857 if (vc->vc_decscnm != on_off) {
1858 vc->vc_decscnm = on_off;
1859 invert_screen(vc, 0,
1860 vc->vc_screenbuf_size,
1861 false);
1862 update_attr(vc);
1863 }
1864 break;
1865 case 6: /* Origin relative/absolute */
1866 vc->vc_decom = on_off;
1867 gotoxay(vc, 0, 0);
1868 break;
1869 case 7: /* Autowrap on/off */
1870 vc->vc_decawm = on_off;
1871 break;
1872 case 8: /* Autorepeat on/off */
1873 if (on_off)
1874 set_kbd(vc, decarm);
1875 else
1876 clr_kbd(vc, decarm);
1877 break;
1878 case 9:
1879 vc->vc_report_mouse = on_off ? 1 : 0;
1880 break;
1881 case 25: /* Cursor on/off */
1882 vc->vc_deccm = on_off;
1883 break;
1884 case 1000:
1885 vc->vc_report_mouse = on_off ? 2 : 0;
1886 break;
1887 }
1888 } else {
1889 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1890 case 3: /* Monitor (display ctrls) */
1891 vc->vc_disp_ctrl = on_off;
1892 break;
1893 case 4: /* Insert Mode on/off */
1894 vc->vc_decim = on_off;
1895 break;
1896 case 20: /* Lf, Enter == CrLf/Lf */
1897 if (on_off)
1898 set_kbd(vc, lnm);
1899 else
1900 clr_kbd(vc, lnm);
1901 break;
1902 }
1903 }
1904 }
1905
1906 /* console_lock is held */
setterm_command(struct vc_data * vc)1907 static void setterm_command(struct vc_data *vc)
1908 {
1909 switch (vc->vc_par[0]) {
1910 case 1: /* set color for underline mode */
1911 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1912 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1913 if (vc->state.underline)
1914 update_attr(vc);
1915 }
1916 break;
1917 case 2: /* set color for half intensity mode */
1918 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1919 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1920 if (vc->state.intensity == VCI_HALF_BRIGHT)
1921 update_attr(vc);
1922 }
1923 break;
1924 case 8: /* store colors as defaults */
1925 vc->vc_def_color = vc->vc_attr;
1926 if (vc->vc_hi_font_mask == 0x100)
1927 vc->vc_def_color >>= 1;
1928 default_attr(vc);
1929 update_attr(vc);
1930 break;
1931 case 9: /* set blanking interval */
1932 blankinterval = min(vc->vc_par[1], 60U) * 60;
1933 poke_blanked_console();
1934 break;
1935 case 10: /* set bell frequency in Hz */
1936 if (vc->vc_npar >= 1)
1937 vc->vc_bell_pitch = vc->vc_par[1];
1938 else
1939 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1940 break;
1941 case 11: /* set bell duration in msec */
1942 if (vc->vc_npar >= 1)
1943 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1944 msecs_to_jiffies(vc->vc_par[1]) : 0;
1945 else
1946 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1947 break;
1948 case 12: /* bring specified console to the front */
1949 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1950 set_console(vc->vc_par[1] - 1);
1951 break;
1952 case 13: /* unblank the screen */
1953 poke_blanked_console();
1954 break;
1955 case 14: /* set vesa powerdown interval */
1956 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
1957 break;
1958 case 15: /* activate the previous console */
1959 set_console(last_console);
1960 break;
1961 case 16: /* set cursor blink duration in msec */
1962 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1963 vc->vc_par[1] <= USHRT_MAX)
1964 vc->vc_cur_blink_ms = vc->vc_par[1];
1965 else
1966 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1967 break;
1968 }
1969 }
1970
1971 /* console_lock is held */
csi_at(struct vc_data * vc,unsigned int nr)1972 static void csi_at(struct vc_data *vc, unsigned int nr)
1973 {
1974 if (nr > vc->vc_cols - vc->state.x)
1975 nr = vc->vc_cols - vc->state.x;
1976 else if (!nr)
1977 nr = 1;
1978 insert_char(vc, nr);
1979 }
1980
1981 /* console_lock is held */
csi_L(struct vc_data * vc,unsigned int nr)1982 static void csi_L(struct vc_data *vc, unsigned int nr)
1983 {
1984 if (nr > vc->vc_rows - vc->state.y)
1985 nr = vc->vc_rows - vc->state.y;
1986 else if (!nr)
1987 nr = 1;
1988 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
1989 vc->vc_need_wrap = 0;
1990 }
1991
1992 /* console_lock is held */
csi_P(struct vc_data * vc,unsigned int nr)1993 static void csi_P(struct vc_data *vc, unsigned int nr)
1994 {
1995 if (nr > vc->vc_cols - vc->state.x)
1996 nr = vc->vc_cols - vc->state.x;
1997 else if (!nr)
1998 nr = 1;
1999 delete_char(vc, nr);
2000 }
2001
2002 /* console_lock is held */
csi_M(struct vc_data * vc,unsigned int nr)2003 static void csi_M(struct vc_data *vc, unsigned int nr)
2004 {
2005 if (nr > vc->vc_rows - vc->state.y)
2006 nr = vc->vc_rows - vc->state.y;
2007 else if (!nr)
2008 nr=1;
2009 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
2010 vc->vc_need_wrap = 0;
2011 }
2012
2013 /* console_lock is held (except via vc_init->reset_terminal */
save_cur(struct vc_data * vc)2014 static void save_cur(struct vc_data *vc)
2015 {
2016 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
2017 }
2018
2019 /* console_lock is held */
restore_cur(struct vc_data * vc)2020 static void restore_cur(struct vc_data *vc)
2021 {
2022 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2023
2024 gotoxy(vc, vc->state.x, vc->state.y);
2025 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2026 vc);
2027 update_attr(vc);
2028 vc->vc_need_wrap = 0;
2029 }
2030
2031 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2032 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2033 ESpalette, ESosc, ESapc, ESpm, ESdcs };
2034
2035 /* console_lock is held (except via vc_init()) */
reset_terminal(struct vc_data * vc,int do_clear)2036 static void reset_terminal(struct vc_data *vc, int do_clear)
2037 {
2038 unsigned int i;
2039
2040 vc->vc_top = 0;
2041 vc->vc_bottom = vc->vc_rows;
2042 vc->vc_state = ESnormal;
2043 vc->vc_priv = EPecma;
2044 vc->vc_translate = set_translate(LAT1_MAP, vc);
2045 vc->state.Gx_charset[0] = LAT1_MAP;
2046 vc->state.Gx_charset[1] = GRAF_MAP;
2047 vc->state.charset = 0;
2048 vc->vc_need_wrap = 0;
2049 vc->vc_report_mouse = 0;
2050 vc->vc_utf = default_utf8;
2051 vc->vc_utf_count = 0;
2052
2053 vc->vc_disp_ctrl = 0;
2054 vc->vc_toggle_meta = 0;
2055
2056 vc->vc_decscnm = 0;
2057 vc->vc_decom = 0;
2058 vc->vc_decawm = 1;
2059 vc->vc_deccm = global_cursor_default;
2060 vc->vc_decim = 0;
2061
2062 vt_reset_keyboard(vc->vc_num);
2063
2064 vc->vc_cursor_type = cur_default;
2065 vc->vc_complement_mask = vc->vc_s_complement_mask;
2066
2067 default_attr(vc);
2068 update_attr(vc);
2069
2070 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2071 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2072 set_bit(i, vc->vc_tab_stop);
2073
2074 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2075 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2076 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2077
2078 gotoxy(vc, 0, 0);
2079 save_cur(vc);
2080 if (do_clear)
2081 csi_J(vc, 2);
2082 }
2083
vc_setGx(struct vc_data * vc,unsigned int which,int c)2084 static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
2085 {
2086 unsigned char *charset = &vc->state.Gx_charset[which];
2087
2088 switch (c) {
2089 case '0':
2090 *charset = GRAF_MAP;
2091 break;
2092 case 'B':
2093 *charset = LAT1_MAP;
2094 break;
2095 case 'U':
2096 *charset = IBMPC_MAP;
2097 break;
2098 case 'K':
2099 *charset = USER_MAP;
2100 break;
2101 }
2102
2103 if (vc->state.charset == which)
2104 vc->vc_translate = set_translate(*charset, vc);
2105 }
2106
2107 /* is this state an ANSI control string? */
ansi_control_string(unsigned int state)2108 static bool ansi_control_string(unsigned int state)
2109 {
2110 if (state == ESosc || state == ESapc || state == ESpm || state == ESdcs)
2111 return true;
2112 return false;
2113 }
2114
2115 /* console_lock is held */
do_con_trol(struct tty_struct * tty,struct vc_data * vc,int c)2116 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2117 {
2118 /*
2119 * Control characters can be used in the _middle_
2120 * of an escape sequence, aside from ANSI control strings.
2121 */
2122 if (ansi_control_string(vc->vc_state) && c >= 8 && c <= 13)
2123 return;
2124 switch (c) {
2125 case 0:
2126 return;
2127 case 7:
2128 if (ansi_control_string(vc->vc_state))
2129 vc->vc_state = ESnormal;
2130 else if (vc->vc_bell_duration)
2131 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2132 return;
2133 case 8:
2134 bs(vc);
2135 return;
2136 case 9:
2137 vc->vc_pos -= (vc->state.x << 1);
2138
2139 vc->state.x = find_next_bit(vc->vc_tab_stop,
2140 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2141 vc->state.x + 1);
2142 if (vc->state.x >= VC_TABSTOPS_COUNT)
2143 vc->state.x = vc->vc_cols - 1;
2144
2145 vc->vc_pos += (vc->state.x << 1);
2146 notify_write(vc, '\t');
2147 return;
2148 case 10: case 11: case 12:
2149 lf(vc);
2150 if (!is_kbd(vc, lnm))
2151 return;
2152 fallthrough;
2153 case 13:
2154 cr(vc);
2155 return;
2156 case 14:
2157 vc->state.charset = 1;
2158 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
2159 vc->vc_disp_ctrl = 1;
2160 return;
2161 case 15:
2162 vc->state.charset = 0;
2163 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
2164 vc->vc_disp_ctrl = 0;
2165 return;
2166 case 24: case 26:
2167 vc->vc_state = ESnormal;
2168 return;
2169 case 27:
2170 vc->vc_state = ESesc;
2171 return;
2172 case 127:
2173 del(vc);
2174 return;
2175 case 128+27:
2176 vc->vc_state = ESsquare;
2177 return;
2178 }
2179 switch(vc->vc_state) {
2180 case ESesc:
2181 vc->vc_state = ESnormal;
2182 switch (c) {
2183 case '[':
2184 vc->vc_state = ESsquare;
2185 return;
2186 case ']':
2187 vc->vc_state = ESnonstd;
2188 return;
2189 case '_':
2190 vc->vc_state = ESapc;
2191 return;
2192 case '^':
2193 vc->vc_state = ESpm;
2194 return;
2195 case '%':
2196 vc->vc_state = ESpercent;
2197 return;
2198 case 'E':
2199 cr(vc);
2200 lf(vc);
2201 return;
2202 case 'M':
2203 ri(vc);
2204 return;
2205 case 'D':
2206 lf(vc);
2207 return;
2208 case 'H':
2209 if (vc->state.x < VC_TABSTOPS_COUNT)
2210 set_bit(vc->state.x, vc->vc_tab_stop);
2211 return;
2212 case 'P':
2213 vc->vc_state = ESdcs;
2214 return;
2215 case 'Z':
2216 respond_ID(tty);
2217 return;
2218 case '7':
2219 save_cur(vc);
2220 return;
2221 case '8':
2222 restore_cur(vc);
2223 return;
2224 case '(':
2225 vc->vc_state = ESsetG0;
2226 return;
2227 case ')':
2228 vc->vc_state = ESsetG1;
2229 return;
2230 case '#':
2231 vc->vc_state = EShash;
2232 return;
2233 case 'c':
2234 reset_terminal(vc, 1);
2235 return;
2236 case '>': /* Numeric keypad */
2237 clr_kbd(vc, kbdapplic);
2238 return;
2239 case '=': /* Appl. keypad */
2240 set_kbd(vc, kbdapplic);
2241 return;
2242 }
2243 return;
2244 case ESnonstd:
2245 if (c=='P') { /* palette escape sequence */
2246 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2247 vc->vc_par[vc->vc_npar] = 0;
2248 vc->vc_npar = 0;
2249 vc->vc_state = ESpalette;
2250 return;
2251 } else if (c=='R') { /* reset palette */
2252 reset_palette(vc);
2253 vc->vc_state = ESnormal;
2254 } else if (c>='0' && c<='9')
2255 vc->vc_state = ESosc;
2256 else
2257 vc->vc_state = ESnormal;
2258 return;
2259 case ESpalette:
2260 if (isxdigit(c)) {
2261 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2262 if (vc->vc_npar == 7) {
2263 int i = vc->vc_par[0] * 3, j = 1;
2264 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2265 vc->vc_palette[i++] += vc->vc_par[j++];
2266 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2267 vc->vc_palette[i++] += vc->vc_par[j++];
2268 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2269 vc->vc_palette[i] += vc->vc_par[j];
2270 set_palette(vc);
2271 vc->vc_state = ESnormal;
2272 }
2273 } else
2274 vc->vc_state = ESnormal;
2275 return;
2276 case ESsquare:
2277 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2278 vc->vc_par[vc->vc_npar] = 0;
2279 vc->vc_npar = 0;
2280 vc->vc_state = ESgetpars;
2281 if (c == '[') { /* Function key */
2282 vc->vc_state=ESfunckey;
2283 return;
2284 }
2285 switch (c) {
2286 case '?':
2287 vc->vc_priv = EPdec;
2288 return;
2289 case '>':
2290 vc->vc_priv = EPgt;
2291 return;
2292 case '=':
2293 vc->vc_priv = EPeq;
2294 return;
2295 case '<':
2296 vc->vc_priv = EPlt;
2297 return;
2298 }
2299 vc->vc_priv = EPecma;
2300 fallthrough;
2301 case ESgetpars:
2302 if (c == ';' && vc->vc_npar < NPAR - 1) {
2303 vc->vc_npar++;
2304 return;
2305 } else if (c>='0' && c<='9') {
2306 vc->vc_par[vc->vc_npar] *= 10;
2307 vc->vc_par[vc->vc_npar] += c - '0';
2308 return;
2309 }
2310 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2311 vc->vc_state = EScsiignore;
2312 return;
2313 }
2314 vc->vc_state = ESnormal;
2315 switch(c) {
2316 case 'h':
2317 if (vc->vc_priv <= EPdec)
2318 set_mode(vc, 1);
2319 return;
2320 case 'l':
2321 if (vc->vc_priv <= EPdec)
2322 set_mode(vc, 0);
2323 return;
2324 case 'c':
2325 if (vc->vc_priv == EPdec) {
2326 if (vc->vc_par[0])
2327 vc->vc_cursor_type =
2328 CUR_MAKE(vc->vc_par[0],
2329 vc->vc_par[1],
2330 vc->vc_par[2]);
2331 else
2332 vc->vc_cursor_type = cur_default;
2333 return;
2334 }
2335 break;
2336 case 'm':
2337 if (vc->vc_priv == EPdec) {
2338 clear_selection();
2339 if (vc->vc_par[0])
2340 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2341 else
2342 vc->vc_complement_mask = vc->vc_s_complement_mask;
2343 return;
2344 }
2345 break;
2346 case 'n':
2347 if (vc->vc_priv == EPecma) {
2348 if (vc->vc_par[0] == 5)
2349 status_report(tty);
2350 else if (vc->vc_par[0] == 6)
2351 cursor_report(vc, tty);
2352 }
2353 return;
2354 }
2355 if (vc->vc_priv != EPecma) {
2356 vc->vc_priv = EPecma;
2357 return;
2358 }
2359 switch(c) {
2360 case 'G': case '`':
2361 if (vc->vc_par[0])
2362 vc->vc_par[0]--;
2363 gotoxy(vc, vc->vc_par[0], vc->state.y);
2364 return;
2365 case 'A':
2366 if (!vc->vc_par[0])
2367 vc->vc_par[0]++;
2368 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
2369 return;
2370 case 'B': case 'e':
2371 if (!vc->vc_par[0])
2372 vc->vc_par[0]++;
2373 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
2374 return;
2375 case 'C': case 'a':
2376 if (!vc->vc_par[0])
2377 vc->vc_par[0]++;
2378 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
2379 return;
2380 case 'D':
2381 if (!vc->vc_par[0])
2382 vc->vc_par[0]++;
2383 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
2384 return;
2385 case 'E':
2386 if (!vc->vc_par[0])
2387 vc->vc_par[0]++;
2388 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
2389 return;
2390 case 'F':
2391 if (!vc->vc_par[0])
2392 vc->vc_par[0]++;
2393 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
2394 return;
2395 case 'd':
2396 if (vc->vc_par[0])
2397 vc->vc_par[0]--;
2398 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
2399 return;
2400 case 'H': case 'f':
2401 if (vc->vc_par[0])
2402 vc->vc_par[0]--;
2403 if (vc->vc_par[1])
2404 vc->vc_par[1]--;
2405 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2406 return;
2407 case 'J':
2408 csi_J(vc, vc->vc_par[0]);
2409 return;
2410 case 'K':
2411 csi_K(vc, vc->vc_par[0]);
2412 return;
2413 case 'L':
2414 csi_L(vc, vc->vc_par[0]);
2415 return;
2416 case 'M':
2417 csi_M(vc, vc->vc_par[0]);
2418 return;
2419 case 'P':
2420 csi_P(vc, vc->vc_par[0]);
2421 return;
2422 case 'c':
2423 if (!vc->vc_par[0])
2424 respond_ID(tty);
2425 return;
2426 case 'g':
2427 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2428 set_bit(vc->state.x, vc->vc_tab_stop);
2429 else if (vc->vc_par[0] == 3)
2430 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2431 return;
2432 case 'm':
2433 csi_m(vc);
2434 return;
2435 case 'q': /* DECLL - but only 3 leds */
2436 /* map 0,1,2,3 to 0,1,2,4 */
2437 if (vc->vc_par[0] < 4)
2438 vt_set_led_state(vc->vc_num,
2439 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2440 return;
2441 case 'r':
2442 if (!vc->vc_par[0])
2443 vc->vc_par[0]++;
2444 if (!vc->vc_par[1])
2445 vc->vc_par[1] = vc->vc_rows;
2446 /* Minimum allowed region is 2 lines */
2447 if (vc->vc_par[0] < vc->vc_par[1] &&
2448 vc->vc_par[1] <= vc->vc_rows) {
2449 vc->vc_top = vc->vc_par[0] - 1;
2450 vc->vc_bottom = vc->vc_par[1];
2451 gotoxay(vc, 0, 0);
2452 }
2453 return;
2454 case 's':
2455 save_cur(vc);
2456 return;
2457 case 'u':
2458 restore_cur(vc);
2459 return;
2460 case 'X':
2461 csi_X(vc, vc->vc_par[0]);
2462 return;
2463 case '@':
2464 csi_at(vc, vc->vc_par[0]);
2465 return;
2466 case ']': /* setterm functions */
2467 setterm_command(vc);
2468 return;
2469 }
2470 return;
2471 case EScsiignore:
2472 if (c >= 20 && c <= 0x3f)
2473 return;
2474 vc->vc_state = ESnormal;
2475 return;
2476 case ESpercent:
2477 vc->vc_state = ESnormal;
2478 switch (c) {
2479 case '@': /* defined in ISO 2022 */
2480 vc->vc_utf = 0;
2481 return;
2482 case 'G': /* prelim official escape code */
2483 case '8': /* retained for compatibility */
2484 vc->vc_utf = 1;
2485 return;
2486 }
2487 return;
2488 case ESfunckey:
2489 vc->vc_state = ESnormal;
2490 return;
2491 case EShash:
2492 vc->vc_state = ESnormal;
2493 if (c == '8') {
2494 /* DEC screen alignment test. kludge :-) */
2495 vc->vc_video_erase_char =
2496 (vc->vc_video_erase_char & 0xff00) | 'E';
2497 csi_J(vc, 2);
2498 vc->vc_video_erase_char =
2499 (vc->vc_video_erase_char & 0xff00) | ' ';
2500 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2501 }
2502 return;
2503 case ESsetG0:
2504 vc_setGx(vc, 0, c);
2505 vc->vc_state = ESnormal;
2506 return;
2507 case ESsetG1:
2508 vc_setGx(vc, 1, c);
2509 vc->vc_state = ESnormal;
2510 return;
2511 case ESapc:
2512 return;
2513 case ESosc:
2514 return;
2515 case ESpm:
2516 return;
2517 case ESdcs:
2518 return;
2519 default:
2520 vc->vc_state = ESnormal;
2521 }
2522 }
2523
2524 /* is_double_width() is based on the wcwidth() implementation by
2525 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2526 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2527 */
2528 struct interval {
2529 uint32_t first;
2530 uint32_t last;
2531 };
2532
ucs_cmp(const void * key,const void * elt)2533 static int ucs_cmp(const void *key, const void *elt)
2534 {
2535 uint32_t ucs = *(uint32_t *)key;
2536 struct interval e = *(struct interval *) elt;
2537
2538 if (ucs > e.last)
2539 return 1;
2540 else if (ucs < e.first)
2541 return -1;
2542 return 0;
2543 }
2544
is_double_width(uint32_t ucs)2545 static int is_double_width(uint32_t ucs)
2546 {
2547 static const struct interval double_width[] = {
2548 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2549 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2550 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2551 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2552 };
2553 if (ucs < double_width[0].first ||
2554 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2555 return 0;
2556
2557 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2558 sizeof(struct interval), ucs_cmp) != NULL;
2559 }
2560
2561 struct vc_draw_region {
2562 unsigned long from, to;
2563 int x;
2564 };
2565
con_flush(struct vc_data * vc,struct vc_draw_region * draw)2566 static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2567 {
2568 if (draw->x < 0)
2569 return;
2570
2571 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2572 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2573 draw->x);
2574 draw->x = -1;
2575 }
2576
vc_translate_ascii(const struct vc_data * vc,int c)2577 static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2578 {
2579 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2580 if (vc->vc_toggle_meta)
2581 c |= 0x80;
2582
2583 return vc->vc_translate[c];
2584 }
2585
2586 return c;
2587 }
2588
2589
2590 /**
2591 * vc_sanitize_unicode -- Replace invalid Unicode code points with U+FFFD
2592 * @c: the received character, or U+FFFD for invalid sequences.
2593 */
vc_sanitize_unicode(const int c)2594 static inline int vc_sanitize_unicode(const int c)
2595 {
2596 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2597 return 0xfffd;
2598
2599 return c;
2600 }
2601
2602 /**
2603 * vc_translate_unicode -- Combine UTF-8 into Unicode in @vc_utf_char
2604 * @vc: virtual console
2605 * @c: character to translate
2606 * @rescan: we return true if we need more (continuation) data
2607 *
2608 * @vc_utf_char is the being-constructed unicode character.
2609 * @vc_utf_count is the number of continuation bytes still expected to arrive.
2610 * @vc_npar is the number of continuation bytes arrived so far.
2611 */
vc_translate_unicode(struct vc_data * vc,int c,bool * rescan)2612 static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2613 {
2614 static const u32 utf8_length_changes[] = {
2615 0x0000007f, 0x000007ff, 0x0000ffff,
2616 0x001fffff, 0x03ffffff, 0x7fffffff
2617 };
2618
2619 /* Continuation byte received */
2620 if ((c & 0xc0) == 0x80) {
2621 /* Unexpected continuation byte? */
2622 if (!vc->vc_utf_count)
2623 return 0xfffd;
2624
2625 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2626 vc->vc_npar++;
2627 if (--vc->vc_utf_count)
2628 goto need_more_bytes;
2629
2630 /* Got a whole character */
2631 c = vc->vc_utf_char;
2632 /* Reject overlong sequences */
2633 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2634 c > utf8_length_changes[vc->vc_npar])
2635 return 0xfffd;
2636
2637 return vc_sanitize_unicode(c);
2638 }
2639
2640 /* Single ASCII byte or first byte of a sequence received */
2641 if (vc->vc_utf_count) {
2642 /* Continuation byte expected */
2643 *rescan = true;
2644 vc->vc_utf_count = 0;
2645 return 0xfffd;
2646 }
2647
2648 /* Nothing to do if an ASCII byte was received */
2649 if (c <= 0x7f)
2650 return c;
2651
2652 /* First byte of a multibyte sequence received */
2653 vc->vc_npar = 0;
2654 if ((c & 0xe0) == 0xc0) {
2655 vc->vc_utf_count = 1;
2656 vc->vc_utf_char = (c & 0x1f);
2657 } else if ((c & 0xf0) == 0xe0) {
2658 vc->vc_utf_count = 2;
2659 vc->vc_utf_char = (c & 0x0f);
2660 } else if ((c & 0xf8) == 0xf0) {
2661 vc->vc_utf_count = 3;
2662 vc->vc_utf_char = (c & 0x07);
2663 } else if ((c & 0xfc) == 0xf8) {
2664 vc->vc_utf_count = 4;
2665 vc->vc_utf_char = (c & 0x03);
2666 } else if ((c & 0xfe) == 0xfc) {
2667 vc->vc_utf_count = 5;
2668 vc->vc_utf_char = (c & 0x01);
2669 } else {
2670 /* 254 and 255 are invalid */
2671 return 0xfffd;
2672 }
2673
2674 need_more_bytes:
2675 return -1;
2676 }
2677
vc_translate(struct vc_data * vc,int * c,bool * rescan)2678 static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2679 {
2680 /* Do no translation at all in control states */
2681 if (vc->vc_state != ESnormal)
2682 return *c;
2683
2684 if (vc->vc_utf && !vc->vc_disp_ctrl)
2685 return *c = vc_translate_unicode(vc, *c, rescan);
2686
2687 /* no utf or alternate charset mode */
2688 return vc_translate_ascii(vc, *c);
2689 }
2690
vc_invert_attr(const struct vc_data * vc)2691 static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2692 {
2693 if (!vc->vc_can_do_color)
2694 return vc->vc_attr ^ 0x08;
2695
2696 if (vc->vc_hi_font_mask == 0x100)
2697 return (vc->vc_attr & 0x11) |
2698 ((vc->vc_attr & 0xe0) >> 4) |
2699 ((vc->vc_attr & 0x0e) << 4);
2700
2701 return (vc->vc_attr & 0x88) |
2702 ((vc->vc_attr & 0x70) >> 4) |
2703 ((vc->vc_attr & 0x07) << 4);
2704 }
2705
vc_is_control(struct vc_data * vc,int tc,int c)2706 static bool vc_is_control(struct vc_data *vc, int tc, int c)
2707 {
2708 /*
2709 * A bitmap for codes <32. A bit of 1 indicates that the code
2710 * corresponding to that bit number invokes some special action (such
2711 * as cursor movement) and should not be displayed as a glyph unless
2712 * the disp_ctrl mode is explicitly enabled.
2713 */
2714 static const u32 CTRL_ACTION = 0x0d00ff81;
2715 /* Cannot be overridden by disp_ctrl */
2716 static const u32 CTRL_ALWAYS = 0x0800f501;
2717
2718 if (vc->vc_state != ESnormal)
2719 return true;
2720
2721 if (!tc)
2722 return true;
2723
2724 /*
2725 * If the original code was a control character we only allow a glyph
2726 * to be displayed if the code is not normally used (such as for cursor
2727 * movement) or if the disp_ctrl mode has been explicitly enabled.
2728 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2729 * displayed as control characters, as the console would be pretty
2730 * useless without them; to display an arbitrary font position use the
2731 * direct-to-font zone in UTF-8 mode.
2732 */
2733 if (c < 32) {
2734 if (vc->vc_disp_ctrl)
2735 return CTRL_ALWAYS & BIT(c);
2736 else
2737 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2738 }
2739
2740 if (c == 127 && !vc->vc_disp_ctrl)
2741 return true;
2742
2743 if (c == 128 + 27)
2744 return true;
2745
2746 return false;
2747 }
2748
vc_con_write_normal(struct vc_data * vc,int tc,int c,struct vc_draw_region * draw)2749 static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2750 struct vc_draw_region *draw)
2751 {
2752 int next_c;
2753 unsigned char vc_attr = vc->vc_attr;
2754 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2755 u8 width = 1;
2756 bool inverse = false;
2757
2758 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2759 if (is_double_width(c))
2760 width = 2;
2761 }
2762
2763 /* Now try to find out how to display it */
2764 tc = conv_uni_to_pc(vc, tc);
2765 if (tc & ~charmask) {
2766 if (tc == -1 || tc == -2)
2767 return -1; /* nothing to display */
2768
2769 /* Glyph not found */
2770 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
2771 !(c & ~charmask)) {
2772 /*
2773 * In legacy mode use the glyph we get by a 1:1
2774 * mapping.
2775 * This would make absolutely no sense with Unicode in
2776 * mind, but do this for ASCII characters since a font
2777 * may lack Unicode mapping info and we don't want to
2778 * end up with having question marks only.
2779 */
2780 tc = c;
2781 } else {
2782 /*
2783 * Display U+FFFD. If it's not found, display an inverse
2784 * question mark.
2785 */
2786 tc = conv_uni_to_pc(vc, 0xfffd);
2787 if (tc < 0) {
2788 inverse = true;
2789 tc = conv_uni_to_pc(vc, '?');
2790 if (tc < 0)
2791 tc = '?';
2792
2793 vc_attr = vc_invert_attr(vc);
2794 con_flush(vc, draw);
2795 }
2796 }
2797 }
2798
2799 next_c = c;
2800 while (1) {
2801 if (vc->vc_need_wrap || vc->vc_decim)
2802 con_flush(vc, draw);
2803 if (vc->vc_need_wrap) {
2804 cr(vc);
2805 lf(vc);
2806 }
2807 if (vc->vc_decim)
2808 insert_char(vc, 1);
2809 vc_uniscr_putc(vc, next_c);
2810
2811 if (himask)
2812 tc = ((tc & 0x100) ? himask : 0) |
2813 (tc & 0xff);
2814 tc |= (vc_attr << 8) & ~himask;
2815
2816 scr_writew(tc, (u16 *)vc->vc_pos);
2817
2818 if (con_should_update(vc) && draw->x < 0) {
2819 draw->x = vc->state.x;
2820 draw->from = vc->vc_pos;
2821 }
2822 if (vc->state.x == vc->vc_cols - 1) {
2823 vc->vc_need_wrap = vc->vc_decawm;
2824 draw->to = vc->vc_pos + 2;
2825 } else {
2826 vc->state.x++;
2827 draw->to = (vc->vc_pos += 2);
2828 }
2829
2830 if (!--width)
2831 break;
2832
2833 /* A space is printed in the second column */
2834 tc = conv_uni_to_pc(vc, ' ');
2835 if (tc < 0)
2836 tc = ' ';
2837 next_c = ' ';
2838 }
2839 notify_write(vc, c);
2840
2841 if (inverse)
2842 con_flush(vc, draw);
2843
2844 return 0;
2845 }
2846
2847 /* acquires console_lock */
do_con_write(struct tty_struct * tty,const u8 * buf,int count)2848 static int do_con_write(struct tty_struct *tty, const u8 *buf, int count)
2849 {
2850 struct vc_draw_region draw = {
2851 .x = -1,
2852 };
2853 int c, tc, n = 0;
2854 unsigned int currcons;
2855 struct vc_data *vc;
2856 struct vt_notifier_param param;
2857 bool rescan;
2858
2859 if (in_interrupt())
2860 return count;
2861
2862 console_lock();
2863 vc = tty->driver_data;
2864 if (vc == NULL) {
2865 pr_err("vt: argh, driver_data is NULL !\n");
2866 console_unlock();
2867 return 0;
2868 }
2869
2870 currcons = vc->vc_num;
2871 if (!vc_cons_allocated(currcons)) {
2872 /* could this happen? */
2873 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2874 console_unlock();
2875 return 0;
2876 }
2877
2878
2879 /* undraw cursor first */
2880 if (con_is_fg(vc))
2881 hide_cursor(vc);
2882
2883 param.vc = vc;
2884
2885 while (!tty->flow.stopped && count) {
2886 int orig = *buf;
2887 buf++;
2888 n++;
2889 count--;
2890 rescan_last_byte:
2891 c = orig;
2892 rescan = false;
2893
2894 tc = vc_translate(vc, &c, &rescan);
2895 if (tc == -1)
2896 continue;
2897
2898 param.c = tc;
2899 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2900 ¶m) == NOTIFY_STOP)
2901 continue;
2902
2903 if (vc_is_control(vc, tc, c)) {
2904 con_flush(vc, &draw);
2905 do_con_trol(tty, vc, orig);
2906 continue;
2907 }
2908
2909 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
2910 continue;
2911
2912 if (rescan)
2913 goto rescan_last_byte;
2914 }
2915 con_flush(vc, &draw);
2916 console_conditional_schedule();
2917 notify_update(vc);
2918 console_unlock();
2919 return n;
2920 }
2921
2922 /*
2923 * This is the console switching callback.
2924 *
2925 * Doing console switching in a process context allows
2926 * us to do the switches asynchronously (needed when we want
2927 * to switch due to a keyboard interrupt). Synchronization
2928 * with other console code and prevention of re-entrancy is
2929 * ensured with console_lock.
2930 */
console_callback(struct work_struct * ignored)2931 static void console_callback(struct work_struct *ignored)
2932 {
2933 console_lock();
2934
2935 if (want_console >= 0) {
2936 if (want_console != fg_console &&
2937 vc_cons_allocated(want_console)) {
2938 hide_cursor(vc_cons[fg_console].d);
2939 change_console(vc_cons[want_console].d);
2940 /* we only changed when the console had already
2941 been allocated - a new console is not created
2942 in an interrupt routine */
2943 }
2944 want_console = -1;
2945 }
2946 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2947 do_poke_blanked_console = 0;
2948 poke_blanked_console();
2949 }
2950 if (scrollback_delta) {
2951 struct vc_data *vc = vc_cons[fg_console].d;
2952 clear_selection();
2953 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2954 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2955 scrollback_delta = 0;
2956 }
2957 if (blank_timer_expired) {
2958 do_blank_screen(0);
2959 blank_timer_expired = 0;
2960 }
2961 notify_update(vc_cons[fg_console].d);
2962
2963 console_unlock();
2964 }
2965
set_console(int nr)2966 int set_console(int nr)
2967 {
2968 struct vc_data *vc = vc_cons[fg_console].d;
2969
2970 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2971 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2972
2973 /*
2974 * Console switch will fail in console_callback() or
2975 * change_console() so there is no point scheduling
2976 * the callback
2977 *
2978 * Existing set_console() users don't check the return
2979 * value so this shouldn't break anything
2980 */
2981 return -EINVAL;
2982 }
2983
2984 want_console = nr;
2985 schedule_console_callback();
2986
2987 return 0;
2988 }
2989
2990 struct tty_driver *console_driver;
2991
2992 #ifdef CONFIG_VT_CONSOLE
2993
2994 /**
2995 * vt_kmsg_redirect() - Sets/gets the kernel message console
2996 * @new: The new virtual terminal number or -1 if the console should stay
2997 * unchanged
2998 *
2999 * By default, the kernel messages are always printed on the current virtual
3000 * console. However, the user may modify that default with the
3001 * TIOCL_SETKMSGREDIRECT ioctl call.
3002 *
3003 * This function sets the kernel message console to be @new. It returns the old
3004 * virtual console number. The virtual terminal number 0 (both as parameter and
3005 * return value) means no redirection (i.e. always printed on the currently
3006 * active console).
3007 *
3008 * The parameter -1 means that only the current console is returned, but the
3009 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3010 * case to make the code more understandable.
3011 *
3012 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
3013 * the parameter and always returns 0.
3014 */
vt_kmsg_redirect(int new)3015 int vt_kmsg_redirect(int new)
3016 {
3017 static int kmsg_con;
3018
3019 if (new != -1)
3020 return xchg(&kmsg_con, new);
3021 else
3022 return kmsg_con;
3023 }
3024
3025 /*
3026 * Console on virtual terminal
3027 *
3028 * The console must be locked when we get here.
3029 */
3030
vt_console_print(struct console * co,const char * b,unsigned count)3031 static void vt_console_print(struct console *co, const char *b, unsigned count)
3032 {
3033 struct vc_data *vc = vc_cons[fg_console].d;
3034 unsigned char c;
3035 static DEFINE_SPINLOCK(printing_lock);
3036 const ushort *start;
3037 ushort start_x, cnt;
3038 int kmsg_console;
3039
3040 WARN_CONSOLE_UNLOCKED();
3041
3042 /* this protects against concurrent oops only */
3043 if (!spin_trylock(&printing_lock))
3044 return;
3045
3046 kmsg_console = vt_get_kmsg_redirect();
3047 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3048 vc = vc_cons[kmsg_console - 1].d;
3049
3050 if (!vc_cons_allocated(fg_console)) {
3051 /* impossible */
3052 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3053 goto quit;
3054 }
3055
3056 if (vc->vc_mode != KD_TEXT)
3057 goto quit;
3058
3059 /* undraw cursor first */
3060 if (con_is_fg(vc))
3061 hide_cursor(vc);
3062
3063 start = (ushort *)vc->vc_pos;
3064 start_x = vc->state.x;
3065 cnt = 0;
3066 while (count--) {
3067 c = *b++;
3068 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
3069 if (cnt && con_is_visible(vc))
3070 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3071 cnt = 0;
3072 if (c == 8) { /* backspace */
3073 bs(vc);
3074 start = (ushort *)vc->vc_pos;
3075 start_x = vc->state.x;
3076 continue;
3077 }
3078 if (c != 13)
3079 lf(vc);
3080 cr(vc);
3081 start = (ushort *)vc->vc_pos;
3082 start_x = vc->state.x;
3083 if (c == 10 || c == 13)
3084 continue;
3085 }
3086 vc_uniscr_putc(vc, c);
3087 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3088 notify_write(vc, c);
3089 cnt++;
3090 if (vc->state.x == vc->vc_cols - 1) {
3091 vc->vc_need_wrap = 1;
3092 } else {
3093 vc->vc_pos += 2;
3094 vc->state.x++;
3095 }
3096 }
3097 if (cnt && con_is_visible(vc))
3098 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3099 set_cursor(vc);
3100 notify_update(vc);
3101
3102 quit:
3103 spin_unlock(&printing_lock);
3104 }
3105
vt_console_device(struct console * c,int * index)3106 static struct tty_driver *vt_console_device(struct console *c, int *index)
3107 {
3108 *index = c->index ? c->index-1 : fg_console;
3109 return console_driver;
3110 }
3111
vt_console_setup(struct console * co,char * options)3112 static int vt_console_setup(struct console *co, char *options)
3113 {
3114 return co->index >= MAX_NR_CONSOLES ? -EINVAL : 0;
3115 }
3116
3117 static struct console vt_console_driver = {
3118 .name = "tty",
3119 .setup = vt_console_setup,
3120 .write = vt_console_print,
3121 .device = vt_console_device,
3122 .unblank = unblank_screen,
3123 .flags = CON_PRINTBUFFER,
3124 .index = -1,
3125 };
3126 #endif
3127
3128 /*
3129 * Handling of Linux-specific VC ioctls
3130 */
3131
3132 /*
3133 * Generally a bit racy with respect to console_lock();.
3134 *
3135 * There are some functions which don't need it.
3136 *
3137 * There are some functions which can sleep for arbitrary periods
3138 * (paste_selection) but we don't need the lock there anyway.
3139 *
3140 * set_selection_user has locking, and definitely needs it
3141 */
3142
tioclinux(struct tty_struct * tty,unsigned long arg)3143 int tioclinux(struct tty_struct *tty, unsigned long arg)
3144 {
3145 char type, data;
3146 char __user *p = (char __user *)arg;
3147 int lines;
3148 int ret;
3149
3150 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3151 return -EPERM;
3152 if (get_user(type, p))
3153 return -EFAULT;
3154 ret = 0;
3155
3156 switch (type) {
3157 case TIOCL_SETSEL:
3158 return set_selection_user((struct tiocl_selection
3159 __user *)(p+1), tty);
3160 case TIOCL_PASTESEL:
3161 return paste_selection(tty);
3162 case TIOCL_UNBLANKSCREEN:
3163 console_lock();
3164 unblank_screen();
3165 console_unlock();
3166 break;
3167 case TIOCL_SELLOADLUT:
3168 console_lock();
3169 ret = sel_loadlut(p);
3170 console_unlock();
3171 break;
3172 case TIOCL_GETSHIFTSTATE:
3173 /*
3174 * Make it possible to react to Shift+Mousebutton. Note that
3175 * 'shift_state' is an undocumented kernel-internal variable;
3176 * programs not closely related to the kernel should not use
3177 * this.
3178 */
3179 data = vt_get_shift_state();
3180 return put_user(data, p);
3181 case TIOCL_GETMOUSEREPORTING:
3182 console_lock(); /* May be overkill */
3183 data = mouse_reporting();
3184 console_unlock();
3185 return put_user(data, p);
3186 case TIOCL_SETVESABLANK:
3187 console_lock();
3188 ret = set_vesa_blanking(p);
3189 console_unlock();
3190 break;
3191 case TIOCL_GETKMSGREDIRECT:
3192 data = vt_get_kmsg_redirect();
3193 return put_user(data, p);
3194 case TIOCL_SETKMSGREDIRECT:
3195 if (!capable(CAP_SYS_ADMIN))
3196 return -EPERM;
3197
3198 if (get_user(data, p+1))
3199 return -EFAULT;
3200
3201 vt_kmsg_redirect(data);
3202
3203 break;
3204 case TIOCL_GETFGCONSOLE:
3205 /*
3206 * No locking needed as this is a transiently correct return
3207 * anyway if the caller hasn't disabled switching.
3208 */
3209 return fg_console;
3210 case TIOCL_SCROLLCONSOLE:
3211 if (get_user(lines, (s32 __user *)(p+4)))
3212 return -EFAULT;
3213
3214 /*
3215 * Needs the console lock here. Note that lots of other calls
3216 * need fixing before the lock is actually useful!
3217 */
3218 console_lock();
3219 scrollfront(vc_cons[fg_console].d, lines);
3220 console_unlock();
3221 break;
3222 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3223 console_lock();
3224 ignore_poke = 1;
3225 do_blank_screen(0);
3226 console_unlock();
3227 break;
3228 case TIOCL_BLANKEDSCREEN:
3229 return console_blanked;
3230 default:
3231 return -EINVAL;
3232 }
3233
3234 return ret;
3235 }
3236
3237 /*
3238 * /dev/ttyN handling
3239 */
3240
con_write(struct tty_struct * tty,const u8 * buf,size_t count)3241 static ssize_t con_write(struct tty_struct *tty, const u8 *buf, size_t count)
3242 {
3243 int retval;
3244
3245 retval = do_con_write(tty, buf, count);
3246 con_flush_chars(tty);
3247
3248 return retval;
3249 }
3250
con_put_char(struct tty_struct * tty,u8 ch)3251 static int con_put_char(struct tty_struct *tty, u8 ch)
3252 {
3253 return do_con_write(tty, &ch, 1);
3254 }
3255
con_write_room(struct tty_struct * tty)3256 static unsigned int con_write_room(struct tty_struct *tty)
3257 {
3258 if (tty->flow.stopped)
3259 return 0;
3260 return 32768; /* No limit, really; we're not buffering */
3261 }
3262
3263 /*
3264 * con_throttle and con_unthrottle are only used for
3265 * paste_selection(), which has to stuff in a large number of
3266 * characters...
3267 */
con_throttle(struct tty_struct * tty)3268 static void con_throttle(struct tty_struct *tty)
3269 {
3270 }
3271
con_unthrottle(struct tty_struct * tty)3272 static void con_unthrottle(struct tty_struct *tty)
3273 {
3274 struct vc_data *vc = tty->driver_data;
3275
3276 wake_up_interruptible(&vc->paste_wait);
3277 }
3278
3279 /*
3280 * Turn the Scroll-Lock LED on when the tty is stopped
3281 */
con_stop(struct tty_struct * tty)3282 static void con_stop(struct tty_struct *tty)
3283 {
3284 int console_num;
3285 if (!tty)
3286 return;
3287 console_num = tty->index;
3288 if (!vc_cons_allocated(console_num))
3289 return;
3290 vt_kbd_con_stop(console_num);
3291 }
3292
3293 /*
3294 * Turn the Scroll-Lock LED off when the console is started
3295 */
con_start(struct tty_struct * tty)3296 static void con_start(struct tty_struct *tty)
3297 {
3298 int console_num;
3299 if (!tty)
3300 return;
3301 console_num = tty->index;
3302 if (!vc_cons_allocated(console_num))
3303 return;
3304 vt_kbd_con_start(console_num);
3305 }
3306
con_flush_chars(struct tty_struct * tty)3307 static void con_flush_chars(struct tty_struct *tty)
3308 {
3309 struct vc_data *vc;
3310
3311 if (in_interrupt()) /* from flush_to_ldisc */
3312 return;
3313
3314 /* if we race with con_close(), vt may be null */
3315 console_lock();
3316 vc = tty->driver_data;
3317 if (vc)
3318 set_cursor(vc);
3319 console_unlock();
3320 }
3321
3322 /*
3323 * Allocate the console screen memory.
3324 */
con_install(struct tty_driver * driver,struct tty_struct * tty)3325 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3326 {
3327 unsigned int currcons = tty->index;
3328 struct vc_data *vc;
3329 int ret;
3330
3331 console_lock();
3332 ret = vc_allocate(currcons);
3333 if (ret)
3334 goto unlock;
3335
3336 vc = vc_cons[currcons].d;
3337
3338 /* Still being freed */
3339 if (vc->port.tty) {
3340 ret = -ERESTARTSYS;
3341 goto unlock;
3342 }
3343
3344 ret = tty_port_install(&vc->port, driver, tty);
3345 if (ret)
3346 goto unlock;
3347
3348 tty->driver_data = vc;
3349 vc->port.tty = tty;
3350 tty_port_get(&vc->port);
3351
3352 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3353 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3354 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3355 }
3356 if (vc->vc_utf)
3357 tty->termios.c_iflag |= IUTF8;
3358 else
3359 tty->termios.c_iflag &= ~IUTF8;
3360 unlock:
3361 console_unlock();
3362 return ret;
3363 }
3364
con_open(struct tty_struct * tty,struct file * filp)3365 static int con_open(struct tty_struct *tty, struct file *filp)
3366 {
3367 /* everything done in install */
3368 return 0;
3369 }
3370
3371
con_close(struct tty_struct * tty,struct file * filp)3372 static void con_close(struct tty_struct *tty, struct file *filp)
3373 {
3374 /* Nothing to do - we defer to shutdown */
3375 }
3376
con_shutdown(struct tty_struct * tty)3377 static void con_shutdown(struct tty_struct *tty)
3378 {
3379 struct vc_data *vc = tty->driver_data;
3380 BUG_ON(vc == NULL);
3381 console_lock();
3382 vc->port.tty = NULL;
3383 console_unlock();
3384 }
3385
con_cleanup(struct tty_struct * tty)3386 static void con_cleanup(struct tty_struct *tty)
3387 {
3388 struct vc_data *vc = tty->driver_data;
3389
3390 tty_port_put(&vc->port);
3391 }
3392
3393 static int default_color = 7; /* white */
3394 static int default_italic_color = 2; // green (ASCII)
3395 static int default_underline_color = 3; // cyan (ASCII)
3396 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3397 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3398 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3399
vc_init(struct vc_data * vc,int do_clear)3400 static void vc_init(struct vc_data *vc, int do_clear)
3401 {
3402 int j, k ;
3403
3404 set_origin(vc);
3405 vc->vc_pos = vc->vc_origin;
3406 reset_vc(vc);
3407 for (j=k=0; j<16; j++) {
3408 vc->vc_palette[k++] = default_red[j] ;
3409 vc->vc_palette[k++] = default_grn[j] ;
3410 vc->vc_palette[k++] = default_blu[j] ;
3411 }
3412 vc->vc_def_color = default_color;
3413 vc->vc_ulcolor = default_underline_color;
3414 vc->vc_itcolor = default_italic_color;
3415 vc->vc_halfcolor = 0x08; /* grey */
3416 init_waitqueue_head(&vc->paste_wait);
3417 reset_terminal(vc, do_clear);
3418 }
3419
3420 /*
3421 * This routine initializes console interrupts, and does nothing
3422 * else. If you want the screen to clear, call tty_write with
3423 * the appropriate escape-sequence.
3424 */
3425
con_init(void)3426 static int __init con_init(void)
3427 {
3428 const char *display_desc = NULL;
3429 struct vc_data *vc;
3430 unsigned int currcons = 0, i;
3431
3432 console_lock();
3433
3434 if (!conswitchp)
3435 conswitchp = &dummy_con;
3436 display_desc = conswitchp->con_startup();
3437 if (!display_desc) {
3438 fg_console = 0;
3439 console_unlock();
3440 return 0;
3441 }
3442
3443 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3444 struct con_driver *con_driver = ®istered_con_driver[i];
3445
3446 if (con_driver->con == NULL) {
3447 con_driver->con = conswitchp;
3448 con_driver->desc = display_desc;
3449 con_driver->flag = CON_DRIVER_FLAG_INIT;
3450 con_driver->first = 0;
3451 con_driver->last = MAX_NR_CONSOLES - 1;
3452 break;
3453 }
3454 }
3455
3456 for (i = 0; i < MAX_NR_CONSOLES; i++)
3457 con_driver_map[i] = conswitchp;
3458
3459 if (blankinterval) {
3460 blank_state = blank_normal_wait;
3461 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3462 }
3463
3464 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3465 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3466 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3467 tty_port_init(&vc->port);
3468 visual_init(vc, currcons, 1);
3469 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3470 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3471 vc_init(vc, currcons || !vc->vc_sw->con_save_screen);
3472 }
3473 currcons = fg_console = 0;
3474 master_display_fg = vc = vc_cons[currcons].d;
3475 set_origin(vc);
3476 save_screen(vc);
3477 gotoxy(vc, vc->state.x, vc->state.y);
3478 csi_J(vc, 0);
3479 update_screen(vc);
3480 pr_info("Console: %s %s %dx%d\n",
3481 vc->vc_can_do_color ? "colour" : "mono",
3482 display_desc, vc->vc_cols, vc->vc_rows);
3483
3484 console_unlock();
3485
3486 #ifdef CONFIG_VT_CONSOLE
3487 register_console(&vt_console_driver);
3488 #endif
3489 return 0;
3490 }
3491 console_initcall(con_init);
3492
3493 static const struct tty_operations con_ops = {
3494 .install = con_install,
3495 .open = con_open,
3496 .close = con_close,
3497 .write = con_write,
3498 .write_room = con_write_room,
3499 .put_char = con_put_char,
3500 .flush_chars = con_flush_chars,
3501 .ioctl = vt_ioctl,
3502 #ifdef CONFIG_COMPAT
3503 .compat_ioctl = vt_compat_ioctl,
3504 #endif
3505 .stop = con_stop,
3506 .start = con_start,
3507 .throttle = con_throttle,
3508 .unthrottle = con_unthrottle,
3509 .resize = vt_resize,
3510 .shutdown = con_shutdown,
3511 .cleanup = con_cleanup,
3512 };
3513
3514 static struct cdev vc0_cdev;
3515
show_tty_active(struct device * dev,struct device_attribute * attr,char * buf)3516 static ssize_t show_tty_active(struct device *dev,
3517 struct device_attribute *attr, char *buf)
3518 {
3519 return sprintf(buf, "tty%d\n", fg_console + 1);
3520 }
3521 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3522
3523 static struct attribute *vt_dev_attrs[] = {
3524 &dev_attr_active.attr,
3525 NULL
3526 };
3527
3528 ATTRIBUTE_GROUPS(vt_dev);
3529
vty_init(const struct file_operations * console_fops)3530 int __init vty_init(const struct file_operations *console_fops)
3531 {
3532 cdev_init(&vc0_cdev, console_fops);
3533 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3534 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3535 panic("Couldn't register /dev/tty0 driver\n");
3536 tty0dev = device_create_with_groups(&tty_class, NULL,
3537 MKDEV(TTY_MAJOR, 0), NULL,
3538 vt_dev_groups, "tty0");
3539 if (IS_ERR(tty0dev))
3540 tty0dev = NULL;
3541
3542 vcs_init();
3543
3544 console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3545 TTY_DRIVER_RESET_TERMIOS);
3546 if (IS_ERR(console_driver))
3547 panic("Couldn't allocate console driver\n");
3548
3549 console_driver->name = "tty";
3550 console_driver->name_base = 1;
3551 console_driver->major = TTY_MAJOR;
3552 console_driver->minor_start = 1;
3553 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3554 console_driver->init_termios = tty_std_termios;
3555 if (default_utf8)
3556 console_driver->init_termios.c_iflag |= IUTF8;
3557 tty_set_operations(console_driver, &con_ops);
3558 if (tty_register_driver(console_driver))
3559 panic("Couldn't register console driver\n");
3560 kbd_init();
3561 console_map_init();
3562 #ifdef CONFIG_MDA_CONSOLE
3563 mda_console_init();
3564 #endif
3565 return 0;
3566 }
3567
3568 static struct class *vtconsole_class;
3569
do_bind_con_driver(const struct consw * csw,int first,int last,int deflt)3570 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3571 int deflt)
3572 {
3573 struct module *owner = csw->owner;
3574 const char *desc = NULL;
3575 struct con_driver *con_driver;
3576 int i, j = -1, k = -1, retval = -ENODEV;
3577
3578 if (!try_module_get(owner))
3579 return -ENODEV;
3580
3581 WARN_CONSOLE_UNLOCKED();
3582
3583 /* check if driver is registered */
3584 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3585 con_driver = ®istered_con_driver[i];
3586
3587 if (con_driver->con == csw) {
3588 desc = con_driver->desc;
3589 retval = 0;
3590 break;
3591 }
3592 }
3593
3594 if (retval)
3595 goto err;
3596
3597 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3598 csw->con_startup();
3599 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3600 }
3601
3602 if (deflt) {
3603 if (conswitchp)
3604 module_put(conswitchp->owner);
3605
3606 __module_get(owner);
3607 conswitchp = csw;
3608 }
3609
3610 first = max(first, con_driver->first);
3611 last = min(last, con_driver->last);
3612
3613 for (i = first; i <= last; i++) {
3614 int old_was_color;
3615 struct vc_data *vc = vc_cons[i].d;
3616
3617 if (con_driver_map[i])
3618 module_put(con_driver_map[i]->owner);
3619 __module_get(owner);
3620 con_driver_map[i] = csw;
3621
3622 if (!vc || !vc->vc_sw)
3623 continue;
3624
3625 j = i;
3626
3627 if (con_is_visible(vc)) {
3628 k = i;
3629 save_screen(vc);
3630 }
3631
3632 old_was_color = vc->vc_can_do_color;
3633 vc->vc_sw->con_deinit(vc);
3634 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3635 visual_init(vc, i, 0);
3636 set_origin(vc);
3637 update_attr(vc);
3638
3639 /* If the console changed between mono <-> color, then
3640 * the attributes in the screenbuf will be wrong. The
3641 * following resets all attributes to something sane.
3642 */
3643 if (old_was_color != vc->vc_can_do_color)
3644 clear_buffer_attributes(vc);
3645 }
3646
3647 pr_info("Console: switching ");
3648 if (!deflt)
3649 pr_cont("consoles %d-%d ", first + 1, last + 1);
3650 if (j >= 0) {
3651 struct vc_data *vc = vc_cons[j].d;
3652
3653 pr_cont("to %s %s %dx%d\n",
3654 vc->vc_can_do_color ? "colour" : "mono",
3655 desc, vc->vc_cols, vc->vc_rows);
3656
3657 if (k >= 0) {
3658 vc = vc_cons[k].d;
3659 update_screen(vc);
3660 }
3661 } else {
3662 pr_cont("to %s\n", desc);
3663 }
3664
3665 retval = 0;
3666 err:
3667 module_put(owner);
3668 return retval;
3669 };
3670
3671
3672 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
do_unbind_con_driver(const struct consw * csw,int first,int last,int deflt)3673 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3674 {
3675 struct module *owner = csw->owner;
3676 const struct consw *defcsw = NULL;
3677 struct con_driver *con_driver = NULL, *con_back = NULL;
3678 int i, retval = -ENODEV;
3679
3680 if (!try_module_get(owner))
3681 return -ENODEV;
3682
3683 WARN_CONSOLE_UNLOCKED();
3684
3685 /* check if driver is registered and if it is unbindable */
3686 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3687 con_driver = ®istered_con_driver[i];
3688
3689 if (con_driver->con == csw &&
3690 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3691 retval = 0;
3692 break;
3693 }
3694 }
3695
3696 if (retval)
3697 goto err;
3698
3699 retval = -ENODEV;
3700
3701 /* check if backup driver exists */
3702 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3703 con_back = ®istered_con_driver[i];
3704
3705 if (con_back->con && con_back->con != csw) {
3706 defcsw = con_back->con;
3707 retval = 0;
3708 break;
3709 }
3710 }
3711
3712 if (retval)
3713 goto err;
3714
3715 if (!con_is_bound(csw))
3716 goto err;
3717
3718 first = max(first, con_driver->first);
3719 last = min(last, con_driver->last);
3720
3721 for (i = first; i <= last; i++) {
3722 if (con_driver_map[i] == csw) {
3723 module_put(csw->owner);
3724 con_driver_map[i] = NULL;
3725 }
3726 }
3727
3728 if (!con_is_bound(defcsw)) {
3729 const struct consw *defconsw = conswitchp;
3730
3731 defcsw->con_startup();
3732 con_back->flag |= CON_DRIVER_FLAG_INIT;
3733 /*
3734 * vgacon may change the default driver to point
3735 * to dummycon, we restore it here...
3736 */
3737 conswitchp = defconsw;
3738 }
3739
3740 if (!con_is_bound(csw))
3741 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3742
3743 /* ignore return value, binding should not fail */
3744 do_bind_con_driver(defcsw, first, last, deflt);
3745 err:
3746 module_put(owner);
3747 return retval;
3748
3749 }
3750 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3751
vt_bind(struct con_driver * con)3752 static int vt_bind(struct con_driver *con)
3753 {
3754 const struct consw *defcsw = NULL, *csw = NULL;
3755 int i, more = 1, first = -1, last = -1, deflt = 0;
3756
3757 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3758 goto err;
3759
3760 csw = con->con;
3761
3762 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3763 struct con_driver *con = ®istered_con_driver[i];
3764
3765 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3766 defcsw = con->con;
3767 break;
3768 }
3769 }
3770
3771 if (!defcsw)
3772 goto err;
3773
3774 while (more) {
3775 more = 0;
3776
3777 for (i = con->first; i <= con->last; i++) {
3778 if (con_driver_map[i] == defcsw) {
3779 if (first == -1)
3780 first = i;
3781 last = i;
3782 more = 1;
3783 } else if (first != -1)
3784 break;
3785 }
3786
3787 if (first == 0 && last == MAX_NR_CONSOLES -1)
3788 deflt = 1;
3789
3790 if (first != -1)
3791 do_bind_con_driver(csw, first, last, deflt);
3792
3793 first = -1;
3794 last = -1;
3795 deflt = 0;
3796 }
3797
3798 err:
3799 return 0;
3800 }
3801
vt_unbind(struct con_driver * con)3802 static int vt_unbind(struct con_driver *con)
3803 {
3804 const struct consw *csw = NULL;
3805 int i, more = 1, first = -1, last = -1, deflt = 0;
3806 int ret;
3807
3808 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3809 goto err;
3810
3811 csw = con->con;
3812
3813 while (more) {
3814 more = 0;
3815
3816 for (i = con->first; i <= con->last; i++) {
3817 if (con_driver_map[i] == csw) {
3818 if (first == -1)
3819 first = i;
3820 last = i;
3821 more = 1;
3822 } else if (first != -1)
3823 break;
3824 }
3825
3826 if (first == 0 && last == MAX_NR_CONSOLES -1)
3827 deflt = 1;
3828
3829 if (first != -1) {
3830 ret = do_unbind_con_driver(csw, first, last, deflt);
3831 if (ret != 0)
3832 return ret;
3833 }
3834
3835 first = -1;
3836 last = -1;
3837 deflt = 0;
3838 }
3839
3840 err:
3841 return 0;
3842 }
3843 #else
vt_bind(struct con_driver * con)3844 static inline int vt_bind(struct con_driver *con)
3845 {
3846 return 0;
3847 }
vt_unbind(struct con_driver * con)3848 static inline int vt_unbind(struct con_driver *con)
3849 {
3850 return 0;
3851 }
3852 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3853
store_bind(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)3854 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3855 const char *buf, size_t count)
3856 {
3857 struct con_driver *con = dev_get_drvdata(dev);
3858 int bind = simple_strtoul(buf, NULL, 0);
3859
3860 console_lock();
3861
3862 if (bind)
3863 vt_bind(con);
3864 else
3865 vt_unbind(con);
3866
3867 console_unlock();
3868
3869 return count;
3870 }
3871
show_bind(struct device * dev,struct device_attribute * attr,char * buf)3872 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3873 char *buf)
3874 {
3875 struct con_driver *con = dev_get_drvdata(dev);
3876 int bind;
3877
3878 console_lock();
3879 bind = con_is_bound(con->con);
3880 console_unlock();
3881
3882 return sysfs_emit(buf, "%i\n", bind);
3883 }
3884
show_name(struct device * dev,struct device_attribute * attr,char * buf)3885 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3886 char *buf)
3887 {
3888 struct con_driver *con = dev_get_drvdata(dev);
3889
3890 return sysfs_emit(buf, "%s %s\n",
3891 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3892 con->desc);
3893
3894 }
3895
3896 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3897 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3898
3899 static struct attribute *con_dev_attrs[] = {
3900 &dev_attr_bind.attr,
3901 &dev_attr_name.attr,
3902 NULL
3903 };
3904
3905 ATTRIBUTE_GROUPS(con_dev);
3906
vtconsole_init_device(struct con_driver * con)3907 static int vtconsole_init_device(struct con_driver *con)
3908 {
3909 con->flag |= CON_DRIVER_FLAG_ATTR;
3910 return 0;
3911 }
3912
vtconsole_deinit_device(struct con_driver * con)3913 static void vtconsole_deinit_device(struct con_driver *con)
3914 {
3915 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3916 }
3917
3918 /**
3919 * con_is_bound - checks if driver is bound to the console
3920 * @csw: console driver
3921 *
3922 * RETURNS: zero if unbound, nonzero if bound
3923 *
3924 * Drivers can call this and if zero, they should release
3925 * all resources allocated on con_startup()
3926 */
con_is_bound(const struct consw * csw)3927 int con_is_bound(const struct consw *csw)
3928 {
3929 int i, bound = 0;
3930
3931 WARN_CONSOLE_UNLOCKED();
3932
3933 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3934 if (con_driver_map[i] == csw) {
3935 bound = 1;
3936 break;
3937 }
3938 }
3939
3940 return bound;
3941 }
3942 EXPORT_SYMBOL(con_is_bound);
3943
3944 /**
3945 * con_is_visible - checks whether the current console is visible
3946 * @vc: virtual console
3947 *
3948 * RETURNS: zero if not visible, nonzero if visible
3949 */
con_is_visible(const struct vc_data * vc)3950 bool con_is_visible(const struct vc_data *vc)
3951 {
3952 WARN_CONSOLE_UNLOCKED();
3953
3954 return *vc->vc_display_fg == vc;
3955 }
3956 EXPORT_SYMBOL(con_is_visible);
3957
3958 /**
3959 * con_debug_enter - prepare the console for the kernel debugger
3960 * @vc: virtual console
3961 *
3962 * Called when the console is taken over by the kernel debugger, this
3963 * function needs to save the current console state, then put the console
3964 * into a state suitable for the kernel debugger.
3965 *
3966 * RETURNS:
3967 * Zero on success, nonzero if a failure occurred when trying to prepare
3968 * the console for the debugger.
3969 */
con_debug_enter(struct vc_data * vc)3970 int con_debug_enter(struct vc_data *vc)
3971 {
3972 int ret = 0;
3973
3974 saved_fg_console = fg_console;
3975 saved_last_console = last_console;
3976 saved_want_console = want_console;
3977 saved_vc_mode = vc->vc_mode;
3978 saved_console_blanked = console_blanked;
3979 vc->vc_mode = KD_TEXT;
3980 console_blanked = 0;
3981 if (vc->vc_sw->con_debug_enter)
3982 ret = vc->vc_sw->con_debug_enter(vc);
3983 #ifdef CONFIG_KGDB_KDB
3984 /* Set the initial LINES variable if it is not already set */
3985 if (vc->vc_rows < 999) {
3986 int linecount;
3987 char lns[4];
3988 const char *setargs[3] = {
3989 "set",
3990 "LINES",
3991 lns,
3992 };
3993 if (kdbgetintenv(setargs[0], &linecount)) {
3994 snprintf(lns, 4, "%i", vc->vc_rows);
3995 kdb_set(2, setargs);
3996 }
3997 }
3998 if (vc->vc_cols < 999) {
3999 int colcount;
4000 char cols[4];
4001 const char *setargs[3] = {
4002 "set",
4003 "COLUMNS",
4004 cols,
4005 };
4006 if (kdbgetintenv(setargs[0], &colcount)) {
4007 snprintf(cols, 4, "%i", vc->vc_cols);
4008 kdb_set(2, setargs);
4009 }
4010 }
4011 #endif /* CONFIG_KGDB_KDB */
4012 return ret;
4013 }
4014 EXPORT_SYMBOL_GPL(con_debug_enter);
4015
4016 /**
4017 * con_debug_leave - restore console state
4018 *
4019 * Restore the console state to what it was before the kernel debugger
4020 * was invoked.
4021 *
4022 * RETURNS:
4023 * Zero on success, nonzero if a failure occurred when trying to restore
4024 * the console.
4025 */
con_debug_leave(void)4026 int con_debug_leave(void)
4027 {
4028 struct vc_data *vc;
4029 int ret = 0;
4030
4031 fg_console = saved_fg_console;
4032 last_console = saved_last_console;
4033 want_console = saved_want_console;
4034 console_blanked = saved_console_blanked;
4035 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4036
4037 vc = vc_cons[fg_console].d;
4038 if (vc->vc_sw->con_debug_leave)
4039 ret = vc->vc_sw->con_debug_leave(vc);
4040 return ret;
4041 }
4042 EXPORT_SYMBOL_GPL(con_debug_leave);
4043
do_register_con_driver(const struct consw * csw,int first,int last)4044 static int do_register_con_driver(const struct consw *csw, int first, int last)
4045 {
4046 struct module *owner = csw->owner;
4047 struct con_driver *con_driver;
4048 const char *desc;
4049 int i, retval;
4050
4051 WARN_CONSOLE_UNLOCKED();
4052
4053 if (!try_module_get(owner))
4054 return -ENODEV;
4055
4056 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4057 con_driver = ®istered_con_driver[i];
4058
4059 /* already registered */
4060 if (con_driver->con == csw) {
4061 retval = -EBUSY;
4062 goto err;
4063 }
4064 }
4065
4066 desc = csw->con_startup();
4067 if (!desc) {
4068 retval = -ENODEV;
4069 goto err;
4070 }
4071
4072 retval = -EINVAL;
4073
4074 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4075 con_driver = ®istered_con_driver[i];
4076
4077 if (con_driver->con == NULL &&
4078 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4079 con_driver->con = csw;
4080 con_driver->desc = desc;
4081 con_driver->node = i;
4082 con_driver->flag = CON_DRIVER_FLAG_MODULE |
4083 CON_DRIVER_FLAG_INIT;
4084 con_driver->first = first;
4085 con_driver->last = last;
4086 retval = 0;
4087 break;
4088 }
4089 }
4090
4091 if (retval)
4092 goto err;
4093
4094 con_driver->dev =
4095 device_create_with_groups(vtconsole_class, NULL,
4096 MKDEV(0, con_driver->node),
4097 con_driver, con_dev_groups,
4098 "vtcon%i", con_driver->node);
4099 if (IS_ERR(con_driver->dev)) {
4100 pr_warn("Unable to create device for %s; errno = %ld\n",
4101 con_driver->desc, PTR_ERR(con_driver->dev));
4102 con_driver->dev = NULL;
4103 } else {
4104 vtconsole_init_device(con_driver);
4105 }
4106
4107 err:
4108 module_put(owner);
4109 return retval;
4110 }
4111
4112
4113 /**
4114 * do_unregister_con_driver - unregister console driver from console layer
4115 * @csw: console driver
4116 *
4117 * DESCRIPTION: All drivers that registers to the console layer must
4118 * call this function upon exit, or if the console driver is in a state
4119 * where it won't be able to handle console services, such as the
4120 * framebuffer console without loaded framebuffer drivers.
4121 *
4122 * The driver must unbind first prior to unregistration.
4123 */
do_unregister_con_driver(const struct consw * csw)4124 int do_unregister_con_driver(const struct consw *csw)
4125 {
4126 int i;
4127
4128 /* cannot unregister a bound driver */
4129 if (con_is_bound(csw))
4130 return -EBUSY;
4131
4132 if (csw == conswitchp)
4133 return -EINVAL;
4134
4135 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4136 struct con_driver *con_driver = ®istered_con_driver[i];
4137
4138 if (con_driver->con == csw) {
4139 /*
4140 * Defer the removal of the sysfs entries since that
4141 * will acquire the kernfs s_active lock and we can't
4142 * acquire this lock while holding the console lock:
4143 * the unbind sysfs entry imposes already the opposite
4144 * order. Reset con already here to prevent any later
4145 * lookup to succeed and mark this slot as zombie, so
4146 * it won't get reused until we complete the removal
4147 * in the deferred work.
4148 */
4149 con_driver->con = NULL;
4150 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4151 schedule_work(&con_driver_unregister_work);
4152
4153 return 0;
4154 }
4155 }
4156
4157 return -ENODEV;
4158 }
4159 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4160
con_driver_unregister_callback(struct work_struct * ignored)4161 static void con_driver_unregister_callback(struct work_struct *ignored)
4162 {
4163 int i;
4164
4165 console_lock();
4166
4167 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4168 struct con_driver *con_driver = ®istered_con_driver[i];
4169
4170 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4171 continue;
4172
4173 console_unlock();
4174
4175 vtconsole_deinit_device(con_driver);
4176 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4177
4178 console_lock();
4179
4180 if (WARN_ON_ONCE(con_driver->con))
4181 con_driver->con = NULL;
4182 con_driver->desc = NULL;
4183 con_driver->dev = NULL;
4184 con_driver->node = 0;
4185 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4186 con_driver->flag = 0;
4187 con_driver->first = 0;
4188 con_driver->last = 0;
4189 }
4190
4191 console_unlock();
4192 }
4193
4194 /*
4195 * If we support more console drivers, this function is used
4196 * when a driver wants to take over some existing consoles
4197 * and become default driver for newly opened ones.
4198 *
4199 * do_take_over_console is basically a register followed by bind
4200 */
do_take_over_console(const struct consw * csw,int first,int last,int deflt)4201 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4202 {
4203 int err;
4204
4205 err = do_register_con_driver(csw, first, last);
4206 /*
4207 * If we get an busy error we still want to bind the console driver
4208 * and return success, as we may have unbound the console driver
4209 * but not unregistered it.
4210 */
4211 if (err == -EBUSY)
4212 err = 0;
4213 if (!err)
4214 do_bind_con_driver(csw, first, last, deflt);
4215
4216 return err;
4217 }
4218 EXPORT_SYMBOL_GPL(do_take_over_console);
4219
4220
4221 /*
4222 * give_up_console is a wrapper to unregister_con_driver. It will only
4223 * work if driver is fully unbound.
4224 */
give_up_console(const struct consw * csw)4225 void give_up_console(const struct consw *csw)
4226 {
4227 console_lock();
4228 do_unregister_con_driver(csw);
4229 console_unlock();
4230 }
4231 EXPORT_SYMBOL(give_up_console);
4232
vtconsole_class_init(void)4233 static int __init vtconsole_class_init(void)
4234 {
4235 int i;
4236
4237 vtconsole_class = class_create("vtconsole");
4238 if (IS_ERR(vtconsole_class)) {
4239 pr_warn("Unable to create vt console class; errno = %ld\n",
4240 PTR_ERR(vtconsole_class));
4241 vtconsole_class = NULL;
4242 }
4243
4244 /* Add system drivers to sysfs */
4245 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4246 struct con_driver *con = ®istered_con_driver[i];
4247
4248 if (con->con && !con->dev) {
4249 con->dev =
4250 device_create_with_groups(vtconsole_class, NULL,
4251 MKDEV(0, con->node),
4252 con, con_dev_groups,
4253 "vtcon%i", con->node);
4254
4255 if (IS_ERR(con->dev)) {
4256 pr_warn("Unable to create device for %s; errno = %ld\n",
4257 con->desc, PTR_ERR(con->dev));
4258 con->dev = NULL;
4259 } else {
4260 vtconsole_init_device(con);
4261 }
4262 }
4263 }
4264
4265 return 0;
4266 }
4267 postcore_initcall(vtconsole_class_init);
4268
4269 /*
4270 * Screen blanking
4271 */
4272
set_vesa_blanking(char __user * p)4273 static int set_vesa_blanking(char __user *p)
4274 {
4275 unsigned int mode;
4276
4277 if (get_user(mode, p + 1))
4278 return -EFAULT;
4279
4280 vesa_blank_mode = (mode < 4) ? mode : 0;
4281 return 0;
4282 }
4283
do_blank_screen(int entering_gfx)4284 void do_blank_screen(int entering_gfx)
4285 {
4286 struct vc_data *vc = vc_cons[fg_console].d;
4287 int i;
4288
4289 might_sleep();
4290
4291 WARN_CONSOLE_UNLOCKED();
4292
4293 if (console_blanked) {
4294 if (blank_state == blank_vesa_wait) {
4295 blank_state = blank_off;
4296 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4297 }
4298 return;
4299 }
4300
4301 /* entering graphics mode? */
4302 if (entering_gfx) {
4303 hide_cursor(vc);
4304 save_screen(vc);
4305 vc->vc_sw->con_blank(vc, -1, 1);
4306 console_blanked = fg_console + 1;
4307 blank_state = blank_off;
4308 set_origin(vc);
4309 return;
4310 }
4311
4312 blank_state = blank_off;
4313
4314 /* don't blank graphics */
4315 if (vc->vc_mode != KD_TEXT) {
4316 console_blanked = fg_console + 1;
4317 return;
4318 }
4319
4320 hide_cursor(vc);
4321 del_timer_sync(&console_timer);
4322 blank_timer_expired = 0;
4323
4324 save_screen(vc);
4325 /* In case we need to reset origin, blanking hook returns 1 */
4326 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4327 console_blanked = fg_console + 1;
4328 if (i)
4329 set_origin(vc);
4330
4331 if (console_blank_hook && console_blank_hook(1))
4332 return;
4333
4334 if (vesa_off_interval && vesa_blank_mode) {
4335 blank_state = blank_vesa_wait;
4336 mod_timer(&console_timer, jiffies + vesa_off_interval);
4337 }
4338 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4339 }
4340 EXPORT_SYMBOL(do_blank_screen);
4341
4342 /*
4343 * Called by timer as well as from vt_console_driver
4344 */
do_unblank_screen(int leaving_gfx)4345 void do_unblank_screen(int leaving_gfx)
4346 {
4347 struct vc_data *vc;
4348
4349 /* This should now always be called from a "sane" (read: can schedule)
4350 * context for the sake of the low level drivers, except in the special
4351 * case of oops_in_progress
4352 */
4353 if (!oops_in_progress)
4354 might_sleep();
4355
4356 WARN_CONSOLE_UNLOCKED();
4357
4358 ignore_poke = 0;
4359 if (!console_blanked)
4360 return;
4361 if (!vc_cons_allocated(fg_console)) {
4362 /* impossible */
4363 pr_warn("unblank_screen: tty %d not allocated ??\n",
4364 fg_console + 1);
4365 return;
4366 }
4367 vc = vc_cons[fg_console].d;
4368 if (vc->vc_mode != KD_TEXT)
4369 return; /* but leave console_blanked != 0 */
4370
4371 if (blankinterval) {
4372 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4373 blank_state = blank_normal_wait;
4374 }
4375
4376 console_blanked = 0;
4377 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4378 /* Low-level driver cannot restore -> do it ourselves */
4379 update_screen(vc);
4380 if (console_blank_hook)
4381 console_blank_hook(0);
4382 set_palette(vc);
4383 set_cursor(vc);
4384 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4385 }
4386 EXPORT_SYMBOL(do_unblank_screen);
4387
4388 /*
4389 * This is called by the outside world to cause a forced unblank, mostly for
4390 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4391 * call it with 1 as an argument and so force a mode restore... that may kill
4392 * X or at least garbage the screen but would also make the Oops visible...
4393 */
unblank_screen(void)4394 static void unblank_screen(void)
4395 {
4396 do_unblank_screen(0);
4397 }
4398
4399 /*
4400 * We defer the timer blanking to work queue so it can take the console mutex
4401 * (console operations can still happen at irq time, but only from printk which
4402 * has the console mutex. Not perfect yet, but better than no locking
4403 */
blank_screen_t(struct timer_list * unused)4404 static void blank_screen_t(struct timer_list *unused)
4405 {
4406 blank_timer_expired = 1;
4407 schedule_work(&console_work);
4408 }
4409
poke_blanked_console(void)4410 void poke_blanked_console(void)
4411 {
4412 WARN_CONSOLE_UNLOCKED();
4413
4414 /* Add this so we quickly catch whoever might call us in a non
4415 * safe context. Nowadays, unblank_screen() isn't to be called in
4416 * atomic contexts and is allowed to schedule (with the special case
4417 * of oops_in_progress, but that isn't of any concern for this
4418 * function. --BenH.
4419 */
4420 might_sleep();
4421
4422 /* This isn't perfectly race free, but a race here would be mostly harmless,
4423 * at worst, we'll do a spurious blank and it's unlikely
4424 */
4425 del_timer(&console_timer);
4426 blank_timer_expired = 0;
4427
4428 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4429 return;
4430 if (console_blanked)
4431 unblank_screen();
4432 else if (blankinterval) {
4433 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4434 blank_state = blank_normal_wait;
4435 }
4436 }
4437
4438 /*
4439 * Palettes
4440 */
4441
set_palette(struct vc_data * vc)4442 static void set_palette(struct vc_data *vc)
4443 {
4444 WARN_CONSOLE_UNLOCKED();
4445
4446 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4447 vc->vc_sw->con_set_palette(vc, color_table);
4448 }
4449
4450 /*
4451 * Load palette into the DAC registers. arg points to a colour
4452 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4453 */
4454
con_set_cmap(unsigned char __user * arg)4455 int con_set_cmap(unsigned char __user *arg)
4456 {
4457 int i, j, k;
4458 unsigned char colormap[3*16];
4459
4460 if (copy_from_user(colormap, arg, sizeof(colormap)))
4461 return -EFAULT;
4462
4463 console_lock();
4464 for (i = k = 0; i < 16; i++) {
4465 default_red[i] = colormap[k++];
4466 default_grn[i] = colormap[k++];
4467 default_blu[i] = colormap[k++];
4468 }
4469 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4470 if (!vc_cons_allocated(i))
4471 continue;
4472 for (j = k = 0; j < 16; j++) {
4473 vc_cons[i].d->vc_palette[k++] = default_red[j];
4474 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4475 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4476 }
4477 set_palette(vc_cons[i].d);
4478 }
4479 console_unlock();
4480
4481 return 0;
4482 }
4483
con_get_cmap(unsigned char __user * arg)4484 int con_get_cmap(unsigned char __user *arg)
4485 {
4486 int i, k;
4487 unsigned char colormap[3*16];
4488
4489 console_lock();
4490 for (i = k = 0; i < 16; i++) {
4491 colormap[k++] = default_red[i];
4492 colormap[k++] = default_grn[i];
4493 colormap[k++] = default_blu[i];
4494 }
4495 console_unlock();
4496
4497 if (copy_to_user(arg, colormap, sizeof(colormap)))
4498 return -EFAULT;
4499
4500 return 0;
4501 }
4502
reset_palette(struct vc_data * vc)4503 void reset_palette(struct vc_data *vc)
4504 {
4505 int j, k;
4506 for (j=k=0; j<16; j++) {
4507 vc->vc_palette[k++] = default_red[j];
4508 vc->vc_palette[k++] = default_grn[j];
4509 vc->vc_palette[k++] = default_blu[j];
4510 }
4511 set_palette(vc);
4512 }
4513
4514 /*
4515 * Font switching
4516 *
4517 * Currently we only support fonts up to 128 pixels wide, at a maximum height
4518 * of 128 pixels. Userspace fontdata may have to be stored with 32 bytes
4519 * (shorts/ints, depending on width) reserved for each character which is
4520 * kinda wasty, but this is done in order to maintain compatibility with the
4521 * EGA/VGA fonts. It is up to the actual low-level console-driver convert data
4522 * into its favorite format (maybe we should add a `fontoffset' field to the
4523 * `display' structure so we won't have to convert the fontdata all the time.
4524 * /Jes
4525 */
4526
4527 #define max_font_width 64
4528 #define max_font_height 128
4529 #define max_font_glyphs 512
4530 #define max_font_size (max_font_glyphs*max_font_width*max_font_height)
4531
con_font_get(struct vc_data * vc,struct console_font_op * op)4532 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4533 {
4534 struct console_font font;
4535 int rc = -EINVAL;
4536 int c;
4537 unsigned int vpitch = op->op == KD_FONT_OP_GET_TALL ? op->height : 32;
4538
4539 if (vpitch > max_font_height)
4540 return -EINVAL;
4541
4542 if (op->data) {
4543 font.data = kvmalloc(max_font_size, GFP_KERNEL);
4544 if (!font.data)
4545 return -ENOMEM;
4546 } else
4547 font.data = NULL;
4548
4549 console_lock();
4550 if (vc->vc_mode != KD_TEXT)
4551 rc = -EINVAL;
4552 else if (vc->vc_sw->con_font_get)
4553 rc = vc->vc_sw->con_font_get(vc, &font, vpitch);
4554 else
4555 rc = -ENOSYS;
4556 console_unlock();
4557
4558 if (rc)
4559 goto out;
4560
4561 c = (font.width+7)/8 * vpitch * font.charcount;
4562
4563 if (op->data && font.charcount > op->charcount)
4564 rc = -ENOSPC;
4565 if (font.width > op->width || font.height > op->height)
4566 rc = -ENOSPC;
4567 if (rc)
4568 goto out;
4569
4570 op->height = font.height;
4571 op->width = font.width;
4572 op->charcount = font.charcount;
4573
4574 if (op->data && copy_to_user(op->data, font.data, c))
4575 rc = -EFAULT;
4576
4577 out:
4578 kvfree(font.data);
4579 return rc;
4580 }
4581
con_font_set(struct vc_data * vc,struct console_font_op * op)4582 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4583 {
4584 struct console_font font;
4585 int rc = -EINVAL;
4586 int size;
4587 unsigned int vpitch = op->op == KD_FONT_OP_SET_TALL ? op->height : 32;
4588
4589 if (vc->vc_mode != KD_TEXT)
4590 return -EINVAL;
4591 if (!op->data)
4592 return -EINVAL;
4593 if (op->charcount > max_font_glyphs)
4594 return -EINVAL;
4595 if (op->width <= 0 || op->width > max_font_width || !op->height ||
4596 op->height > max_font_height)
4597 return -EINVAL;
4598 if (vpitch < op->height)
4599 return -EINVAL;
4600 size = (op->width+7)/8 * vpitch * op->charcount;
4601 if (size > max_font_size)
4602 return -ENOSPC;
4603
4604 font.data = memdup_user(op->data, size);
4605 if (IS_ERR(font.data))
4606 return PTR_ERR(font.data);
4607
4608 font.charcount = op->charcount;
4609 font.width = op->width;
4610 font.height = op->height;
4611
4612 console_lock();
4613 if (vc->vc_mode != KD_TEXT)
4614 rc = -EINVAL;
4615 else if (vc->vc_sw->con_font_set) {
4616 if (vc_is_sel(vc))
4617 clear_selection();
4618 rc = vc->vc_sw->con_font_set(vc, &font, vpitch, op->flags);
4619 } else
4620 rc = -ENOSYS;
4621 console_unlock();
4622 kfree(font.data);
4623 return rc;
4624 }
4625
con_font_default(struct vc_data * vc,struct console_font_op * op)4626 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4627 {
4628 struct console_font font = {.width = op->width, .height = op->height};
4629 char name[MAX_FONT_NAME];
4630 char *s = name;
4631 int rc;
4632
4633
4634 if (!op->data)
4635 s = NULL;
4636 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4637 return -EFAULT;
4638 else
4639 name[MAX_FONT_NAME - 1] = 0;
4640
4641 console_lock();
4642 if (vc->vc_mode != KD_TEXT) {
4643 console_unlock();
4644 return -EINVAL;
4645 }
4646 if (vc->vc_sw->con_font_default) {
4647 if (vc_is_sel(vc))
4648 clear_selection();
4649 rc = vc->vc_sw->con_font_default(vc, &font, s);
4650 } else
4651 rc = -ENOSYS;
4652 console_unlock();
4653 if (!rc) {
4654 op->width = font.width;
4655 op->height = font.height;
4656 }
4657 return rc;
4658 }
4659
con_font_op(struct vc_data * vc,struct console_font_op * op)4660 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4661 {
4662 switch (op->op) {
4663 case KD_FONT_OP_SET:
4664 case KD_FONT_OP_SET_TALL:
4665 return con_font_set(vc, op);
4666 case KD_FONT_OP_GET:
4667 case KD_FONT_OP_GET_TALL:
4668 return con_font_get(vc, op);
4669 case KD_FONT_OP_SET_DEFAULT:
4670 return con_font_default(vc, op);
4671 case KD_FONT_OP_COPY:
4672 /* was buggy and never really used */
4673 return -EINVAL;
4674 }
4675 return -ENOSYS;
4676 }
4677
4678 /*
4679 * Interface exported to selection and vcs.
4680 */
4681
4682 /* used by selection */
screen_glyph(const struct vc_data * vc,int offset)4683 u16 screen_glyph(const struct vc_data *vc, int offset)
4684 {
4685 u16 w = scr_readw(screenpos(vc, offset, true));
4686 u16 c = w & 0xff;
4687
4688 if (w & vc->vc_hi_font_mask)
4689 c |= 0x100;
4690 return c;
4691 }
4692 EXPORT_SYMBOL_GPL(screen_glyph);
4693
screen_glyph_unicode(const struct vc_data * vc,int n)4694 u32 screen_glyph_unicode(const struct vc_data *vc, int n)
4695 {
4696 u32 **uni_lines = vc->vc_uni_lines;
4697
4698 if (uni_lines)
4699 return uni_lines[n / vc->vc_cols][n % vc->vc_cols];
4700
4701 return inverse_translate(vc, screen_glyph(vc, n * 2), true);
4702 }
4703 EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4704
4705 /* used by vcs - note the word offset */
screen_pos(const struct vc_data * vc,int w_offset,bool viewed)4706 unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
4707 {
4708 return screenpos(vc, 2 * w_offset, viewed);
4709 }
4710 EXPORT_SYMBOL_GPL(screen_pos);
4711
getconsxy(const struct vc_data * vc,unsigned char xy[static2])4712 void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
4713 {
4714 /* clamp values if they don't fit */
4715 xy[0] = min(vc->state.x, 0xFFu);
4716 xy[1] = min(vc->state.y, 0xFFu);
4717 }
4718
putconsxy(struct vc_data * vc,unsigned char xy[static const2])4719 void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
4720 {
4721 hide_cursor(vc);
4722 gotoxy(vc, xy[0], xy[1]);
4723 set_cursor(vc);
4724 }
4725
vcs_scr_readw(const struct vc_data * vc,const u16 * org)4726 u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
4727 {
4728 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4729 return softcursor_original;
4730 return scr_readw(org);
4731 }
4732
vcs_scr_writew(struct vc_data * vc,u16 val,u16 * org)4733 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4734 {
4735 scr_writew(val, org);
4736 if ((unsigned long)org == vc->vc_pos) {
4737 softcursor_original = -1;
4738 add_softcursor(vc);
4739 }
4740 }
4741
vcs_scr_updated(struct vc_data * vc)4742 void vcs_scr_updated(struct vc_data *vc)
4743 {
4744 notify_update(vc);
4745 }
4746
vc_scrolldelta_helper(struct vc_data * c,int lines,unsigned int rolled_over,void * base,unsigned int size)4747 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4748 unsigned int rolled_over, void *base, unsigned int size)
4749 {
4750 unsigned long ubase = (unsigned long)base;
4751 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4752 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4753 ptrdiff_t origin = (void *)c->vc_origin - base;
4754 int margin = c->vc_size_row * 4;
4755 int from, wrap, from_off, avail;
4756
4757 /* Turn scrollback off */
4758 if (!lines) {
4759 c->vc_visible_origin = c->vc_origin;
4760 return;
4761 }
4762
4763 /* Do we have already enough to allow jumping from 0 to the end? */
4764 if (rolled_over > scr_end + margin) {
4765 from = scr_end;
4766 wrap = rolled_over + c->vc_size_row;
4767 } else {
4768 from = 0;
4769 wrap = size;
4770 }
4771
4772 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4773 avail = (origin - from + wrap) % wrap;
4774
4775 /* Only a little piece would be left? Show all incl. the piece! */
4776 if (avail < 2 * margin)
4777 margin = 0;
4778 if (from_off < margin)
4779 from_off = 0;
4780 if (from_off > avail - margin)
4781 from_off = avail;
4782
4783 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4784 }
4785 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4786