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