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 : * <g-hunt@ee.utah.edu>
19 : *
20 : * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 : * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 : *
23 : * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 : * Resizing of consoles, aeb, 940926
25 : *
26 : * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 : * <poe@daimi.aau.dk>
28 : *
29 : * User-defined bell sound, new setterm control sequences and printk
30 : * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 : *
32 : * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 : *
34 : * Merge with the abstract console driver by Geert Uytterhoeven
35 : * <geert@linux-m68k.org>, Jan 1997.
36 : *
37 : * Original m68k console driver modifications by
38 : *
39 : * - Arno Griffioen <arno@usn.nl>
40 : * - David Carter <carter@cs.bris.ac.uk>
41 : *
42 : * The abstract console driver provides a generic interface for a text
43 : * console. It supports VGA text mode, frame buffer based graphical consoles
44 : * and special graphics processors that are only accessible through some
45 : * registers (e.g. a TMS340x0 GSP).
46 : *
47 : * The interface to the hardware is specified using a special structure
48 : * (struct consw) which contains function pointers to console operations
49 : * (see <linux/console.h> for more information).
50 : *
51 : * Support for changeable cursor shape
52 : * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 : *
54 : * Ported to i386 and con_scrolldelta fixed
55 : * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 : *
57 : * Resurrected character buffers in videoram plus lots of other trickery
58 : * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 : *
60 : * Removed old-style timers, introduced console_timer, made timer
61 : * deletion SMP-safe. 17Jun00, Andrew Morton
62 : *
63 : * Removed console_lock, enabled interrupts across all console operations
64 : * 13 March 2001, Andrew Morton
65 : *
66 : * Fixed UTF-8 mode so alternate charset modes always work according
67 : * to control sequences interpreted in do_con_trol function
68 : * preserving backward VT100 semigraphics compatibility,
69 : * malformed UTF sequences represented as sequences of replacement glyphs,
70 : * original codes or '?' as a last resort if replacement glyph is undefined
71 : * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72 : */
73 :
74 : #include <linux/module.h>
75 : #include <linux/types.h>
76 : #include <linux/sched/signal.h>
77 : #include <linux/tty.h>
78 : #include <linux/tty_flip.h>
79 : #include <linux/kernel.h>
80 : #include <linux/string.h>
81 : #include <linux/errno.h>
82 : #include <linux/kd.h>
83 : #include <linux/slab.h>
84 : #include <linux/vmalloc.h>
85 : #include <linux/major.h>
86 : #include <linux/mm.h>
87 : #include <linux/console.h>
88 : #include <linux/init.h>
89 : #include <linux/mutex.h>
90 : #include <linux/vt_kern.h>
91 : #include <linux/selection.h>
92 : #include <linux/tiocl.h>
93 : #include <linux/kbd_kern.h>
94 : #include <linux/consolemap.h>
95 : #include <linux/timer.h>
96 : #include <linux/interrupt.h>
97 : #include <linux/workqueue.h>
98 : #include <linux/pm.h>
99 : #include <linux/font.h>
100 : #include <linux/bitops.h>
101 : #include <linux/notifier.h>
102 : #include <linux/device.h>
103 : #include <linux/io.h>
104 : #include <linux/uaccess.h>
105 : #include <linux/kdb.h>
106 : #include <linux/ctype.h>
107 : #include <linux/bsearch.h>
108 : #include <linux/gcd.h>
109 :
110 : #define MAX_NR_CON_DRIVER 16
111 :
112 : #define CON_DRIVER_FLAG_MODULE 1
113 : #define CON_DRIVER_FLAG_INIT 2
114 : #define CON_DRIVER_FLAG_ATTR 4
115 : #define CON_DRIVER_FLAG_ZOMBIE 8
116 :
117 : struct con_driver {
118 : const struct consw *con;
119 : const char *desc;
120 : struct device *dev;
121 : int node;
122 : int first;
123 : int last;
124 : int flag;
125 : };
126 :
127 : static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
128 : const struct consw *conswitchp;
129 :
130 : /*
131 : * Here is the default bell parameters: 750HZ, 1/8th of a second
132 : */
133 : #define DEFAULT_BELL_PITCH 750
134 : #define DEFAULT_BELL_DURATION (HZ/8)
135 : #define DEFAULT_CURSOR_BLINK_MS 200
136 :
137 : struct vc vc_cons [MAX_NR_CONSOLES];
138 :
139 : #ifndef VT_SINGLE_DRIVER
140 : static const struct consw *con_driver_map[MAX_NR_CONSOLES];
141 : #endif
142 :
143 : static int con_open(struct tty_struct *, struct file *);
144 : static void vc_init(struct vc_data *vc, unsigned int rows,
145 : unsigned int cols, int do_clear);
146 : static void gotoxy(struct vc_data *vc, int new_x, int new_y);
147 : static void save_cur(struct vc_data *vc);
148 : static void reset_terminal(struct vc_data *vc, int do_clear);
149 : static void con_flush_chars(struct tty_struct *tty);
150 : static int set_vesa_blanking(char __user *p);
151 : static void set_cursor(struct vc_data *vc);
152 : static void hide_cursor(struct vc_data *vc);
153 : static void console_callback(struct work_struct *ignored);
154 : static void con_driver_unregister_callback(struct work_struct *ignored);
155 : static void blank_screen_t(struct timer_list *unused);
156 : static void set_palette(struct vc_data *vc);
157 :
158 : #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
159 :
160 : static int printable; /* Is console ready for printing? */
161 : int default_utf8 = true;
162 : module_param(default_utf8, int, S_IRUGO | S_IWUSR);
163 : int global_cursor_default = -1;
164 : module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
165 :
166 : static int cur_default = CUR_UNDERLINE;
167 : module_param(cur_default, int, S_IRUGO | S_IWUSR);
168 :
169 : /*
170 : * ignore_poke: don't unblank the screen when things are typed. This is
171 : * mainly for the privacy of braille terminal users.
172 : */
173 : static int ignore_poke;
174 :
175 : int do_poke_blanked_console;
176 : int console_blanked;
177 :
178 : static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
179 : static int vesa_off_interval;
180 : static int blankinterval;
181 : core_param(consoleblank, blankinterval, int, 0444);
182 :
183 : static DECLARE_WORK(console_work, console_callback);
184 : static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
185 :
186 : /*
187 : * fg_console is the current virtual console,
188 : * last_console is the last used one,
189 : * want_console is the console we want to switch to,
190 : * saved_* variants are for save/restore around kernel debugger enter/leave
191 : */
192 : int fg_console;
193 : int last_console;
194 : int want_console = -1;
195 : static int saved_fg_console;
196 : static int saved_last_console;
197 : static int saved_want_console;
198 : static int saved_vc_mode;
199 : static int saved_console_blanked;
200 :
201 : /*
202 : * For each existing display, we have a pointer to console currently visible
203 : * on that display, allowing consoles other than fg_console to be refreshed
204 : * appropriately. Unless the low-level driver supplies its own display_fg
205 : * variable, we use this one for the "master display".
206 : */
207 : static struct vc_data *master_display_fg;
208 :
209 : /*
210 : * Unfortunately, we need to delay tty echo when we're currently writing to the
211 : * console since the code is (and always was) not re-entrant, so we schedule
212 : * all flip requests to process context with schedule-task() and run it from
213 : * console_callback().
214 : */
215 :
216 : /*
217 : * For the same reason, we defer scrollback to the console callback.
218 : */
219 : static int scrollback_delta;
220 :
221 : /*
222 : * Hook so that the power management routines can (un)blank
223 : * the console on our behalf.
224 : */
225 : int (*console_blank_hook)(int);
226 :
227 : static DEFINE_TIMER(console_timer, blank_screen_t);
228 : static int blank_state;
229 : static int blank_timer_expired;
230 : enum {
231 : blank_off = 0,
232 : blank_normal_wait,
233 : blank_vesa_wait,
234 : };
235 :
236 : /*
237 : * /sys/class/tty/tty0/
238 : *
239 : * the attribute 'active' contains the name of the current vc
240 : * console and it supports poll() to detect vc switches
241 : */
242 : static struct device *tty0dev;
243 :
244 : /*
245 : * Notifier list for console events.
246 : */
247 : static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
248 :
249 0 : int register_vt_notifier(struct notifier_block *nb)
250 : {
251 0 : return atomic_notifier_chain_register(&vt_notifier_list, nb);
252 : }
253 : EXPORT_SYMBOL_GPL(register_vt_notifier);
254 :
255 0 : int unregister_vt_notifier(struct notifier_block *nb)
256 : {
257 0 : return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
258 : }
259 : EXPORT_SYMBOL_GPL(unregister_vt_notifier);
260 :
261 54 : static void notify_write(struct vc_data *vc, unsigned int unicode)
262 : {
263 54 : struct vt_notifier_param param = { .vc = vc, .c = unicode };
264 54 : atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
265 0 : }
266 :
267 16 : static void notify_update(struct vc_data *vc)
268 : {
269 16 : struct vt_notifier_param param = { .vc = vc };
270 16 : atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
271 16 : }
272 : /*
273 : * Low-Level Functions
274 : */
275 :
276 46 : static inline bool con_is_fg(const struct vc_data *vc)
277 : {
278 46 : return vc->vc_num == fg_console;
279 : }
280 :
281 55 : static inline bool con_should_update(const struct vc_data *vc)
282 : {
283 55 : return con_is_visible(vc) && !console_blanked;
284 : }
285 :
286 0 : static inline unsigned short *screenpos(const struct vc_data *vc, int offset,
287 : bool viewed)
288 : {
289 0 : unsigned short *p;
290 :
291 0 : if (!viewed)
292 0 : p = (unsigned short *)(vc->vc_origin + offset);
293 0 : else if (!vc->vc_sw->con_screen_pos)
294 0 : p = (unsigned short *)(vc->vc_visible_origin + offset);
295 : else
296 0 : p = vc->vc_sw->con_screen_pos(vc, offset);
297 0 : return p;
298 : }
299 :
300 : /* Called from the keyboard irq path.. */
301 0 : static inline void scrolldelta(int lines)
302 : {
303 : /* FIXME */
304 : /* scrolldelta needs some kind of consistency lock, but the BKL was
305 : and still is not protecting versus the scheduled back end */
306 0 : scrollback_delta += lines;
307 0 : schedule_console_callback();
308 : }
309 :
310 0 : void schedule_console_callback(void)
311 : {
312 0 : schedule_work(&console_work);
313 0 : }
314 :
315 : /*
316 : * Code to manage unicode-based screen buffers
317 : */
318 :
319 : #ifdef NO_VC_UNI_SCREEN
320 : /* this disables and optimizes related code away at compile time */
321 : #define get_vc_uniscr(vc) NULL
322 : #else
323 : #define get_vc_uniscr(vc) vc->vc_uni_screen
324 : #endif
325 :
326 : #define VC_UNI_SCREEN_DEBUG 0
327 :
328 : typedef uint32_t char32_t;
329 :
330 : /*
331 : * Our screen buffer is preceded by an array of line pointers so that
332 : * scrolling only implies some pointer shuffling.
333 : */
334 : struct uni_screen {
335 : char32_t *lines[0];
336 : };
337 :
338 0 : static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
339 : {
340 0 : struct uni_screen *uniscr;
341 0 : void *p;
342 0 : unsigned int memsize, i;
343 :
344 : /* allocate everything in one go */
345 0 : memsize = cols * rows * sizeof(char32_t);
346 0 : memsize += rows * sizeof(char32_t *);
347 0 : p = vmalloc(memsize);
348 0 : if (!p)
349 : return NULL;
350 :
351 : /* initial line pointers */
352 0 : uniscr = p;
353 0 : p = uniscr->lines + rows;
354 0 : for (i = 0; i < rows; i++) {
355 0 : uniscr->lines[i] = p;
356 0 : p += cols * sizeof(char32_t);
357 : }
358 : return uniscr;
359 : }
360 :
361 0 : static void vc_uniscr_free(struct uni_screen *uniscr)
362 : {
363 0 : vfree(uniscr);
364 : }
365 :
366 0 : static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
367 : {
368 0 : vc_uniscr_free(vc->vc_uni_screen);
369 0 : vc->vc_uni_screen = new_uniscr;
370 : }
371 :
372 47 : static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
373 : {
374 47 : struct uni_screen *uniscr = get_vc_uniscr(vc);
375 :
376 47 : if (uniscr)
377 0 : uniscr->lines[vc->state.y][vc->state.x] = uc;
378 : }
379 :
380 0 : static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
381 : {
382 0 : struct uni_screen *uniscr = get_vc_uniscr(vc);
383 :
384 0 : if (uniscr) {
385 0 : char32_t *ln = uniscr->lines[vc->state.y];
386 0 : unsigned int x = vc->state.x, cols = vc->vc_cols;
387 :
388 0 : memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
389 0 : memset32(&ln[x], ' ', nr);
390 : }
391 0 : }
392 :
393 0 : static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
394 : {
395 0 : struct uni_screen *uniscr = get_vc_uniscr(vc);
396 :
397 0 : if (uniscr) {
398 0 : char32_t *ln = uniscr->lines[vc->state.y];
399 0 : unsigned int x = vc->state.x, cols = vc->vc_cols;
400 :
401 0 : memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
402 0 : memset32(&ln[cols - nr], ' ', nr);
403 : }
404 0 : }
405 :
406 1 : static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
407 : unsigned int nr)
408 : {
409 1 : struct uni_screen *uniscr = get_vc_uniscr(vc);
410 :
411 1 : if (uniscr) {
412 0 : char32_t *ln = uniscr->lines[vc->state.y];
413 :
414 0 : memset32(&ln[x], ' ', nr);
415 : }
416 : }
417 :
418 8 : static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
419 : unsigned int nr)
420 : {
421 8 : struct uni_screen *uniscr = get_vc_uniscr(vc);
422 :
423 8 : if (uniscr) {
424 0 : unsigned int cols = vc->vc_cols;
425 :
426 0 : while (nr--)
427 0 : memset32(uniscr->lines[y++], ' ', cols);
428 : }
429 8 : }
430 :
431 0 : static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
432 : enum con_scroll dir, unsigned int nr)
433 : {
434 0 : struct uni_screen *uniscr = get_vc_uniscr(vc);
435 :
436 0 : if (uniscr) {
437 0 : unsigned int i, j, k, sz, d, clear;
438 :
439 0 : sz = b - t;
440 0 : clear = b - nr;
441 0 : d = nr;
442 0 : if (dir == SM_DOWN) {
443 0 : clear = t;
444 0 : d = sz - nr;
445 : }
446 0 : for (i = 0; i < gcd(d, sz); i++) {
447 0 : char32_t *tmp = uniscr->lines[t + i];
448 0 : j = i;
449 0 : while (1) {
450 0 : k = j + d;
451 0 : if (k >= sz)
452 0 : k -= sz;
453 0 : if (k == i)
454 : break;
455 0 : uniscr->lines[t + j] = uniscr->lines[t + k];
456 0 : j = k;
457 : }
458 0 : uniscr->lines[t + j] = tmp;
459 : }
460 0 : vc_uniscr_clear_lines(vc, clear, nr);
461 : }
462 0 : }
463 :
464 0 : static void vc_uniscr_copy_area(struct uni_screen *dst,
465 : unsigned int dst_cols,
466 : unsigned int dst_rows,
467 : struct uni_screen *src,
468 : unsigned int src_cols,
469 : unsigned int src_top_row,
470 : unsigned int src_bot_row)
471 : {
472 0 : unsigned int dst_row = 0;
473 :
474 0 : if (!dst)
475 : return;
476 :
477 0 : while (src_top_row < src_bot_row) {
478 0 : char32_t *src_line = src->lines[src_top_row];
479 0 : char32_t *dst_line = dst->lines[dst_row];
480 :
481 0 : memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
482 0 : if (dst_cols - src_cols)
483 0 : memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
484 0 : src_top_row++;
485 0 : dst_row++;
486 : }
487 0 : while (dst_row < dst_rows) {
488 0 : char32_t *dst_line = dst->lines[dst_row];
489 :
490 0 : memset32(dst_line, ' ', dst_cols);
491 0 : dst_row++;
492 : }
493 : }
494 :
495 : /*
496 : * Called from vcs_read() to make sure unicode screen retrieval is possible.
497 : * This will initialize the unicode screen buffer if not already done.
498 : * This returns 0 if OK, or a negative error code otherwise.
499 : * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
500 : */
501 0 : int vc_uniscr_check(struct vc_data *vc)
502 : {
503 0 : struct uni_screen *uniscr;
504 0 : unsigned short *p;
505 0 : int x, y, mask;
506 :
507 0 : if (__is_defined(NO_VC_UNI_SCREEN))
508 : return -EOPNOTSUPP;
509 :
510 0 : WARN_CONSOLE_UNLOCKED();
511 :
512 0 : if (!vc->vc_utf)
513 : return -ENODATA;
514 :
515 0 : if (vc->vc_uni_screen)
516 : return 0;
517 :
518 0 : uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
519 0 : if (!uniscr)
520 : return -ENOMEM;
521 :
522 : /*
523 : * Let's populate it initially with (imperfect) reverse translation.
524 : * This is the next best thing we can do short of having it enabled
525 : * from the start even when no users rely on this functionality. True
526 : * unicode content will be available after a complete screen refresh.
527 : */
528 0 : p = (unsigned short *)vc->vc_origin;
529 0 : mask = vc->vc_hi_font_mask | 0xff;
530 0 : for (y = 0; y < vc->vc_rows; y++) {
531 0 : char32_t *line = uniscr->lines[y];
532 0 : for (x = 0; x < vc->vc_cols; x++) {
533 0 : u16 glyph = scr_readw(p++) & mask;
534 0 : line[x] = inverse_translate(vc, glyph, true);
535 : }
536 : }
537 :
538 0 : vc->vc_uni_screen = uniscr;
539 0 : return 0;
540 : }
541 :
542 : /*
543 : * Called from vcs_read() to get the unicode data from the screen.
544 : * This must be preceded by a successful call to vc_uniscr_check() once
545 : * the console lock has been taken.
546 : */
547 0 : void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
548 : unsigned int row, unsigned int col, unsigned int nr)
549 : {
550 0 : struct uni_screen *uniscr = get_vc_uniscr(vc);
551 0 : int offset = row * vc->vc_size_row + col * 2;
552 0 : unsigned long pos;
553 :
554 0 : BUG_ON(!uniscr);
555 :
556 0 : pos = (unsigned long)screenpos(vc, offset, viewed);
557 0 : if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
558 : /*
559 : * Desired position falls in the main screen buffer.
560 : * However the actual row/col might be different if
561 : * scrollback is active.
562 : */
563 0 : row = (pos - vc->vc_origin) / vc->vc_size_row;
564 0 : col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
565 0 : memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
566 : } else {
567 : /*
568 : * Scrollback is active. For now let's simply backtranslate
569 : * the screen glyphs until the unicode screen buffer does
570 : * synchronize with console display drivers for a scrollback
571 : * buffer of its own.
572 : */
573 0 : u16 *p = (u16 *)pos;
574 0 : int mask = vc->vc_hi_font_mask | 0xff;
575 0 : char32_t *uni_buf = dest;
576 0 : while (nr--) {
577 0 : u16 glyph = scr_readw(p++) & mask;
578 0 : *uni_buf++ = inverse_translate(vc, glyph, true);
579 : }
580 : }
581 0 : }
582 :
583 : /* this is for validation and debugging only */
584 16 : static void vc_uniscr_debug_check(struct vc_data *vc)
585 : {
586 16 : struct uni_screen *uniscr = get_vc_uniscr(vc);
587 16 : unsigned short *p;
588 16 : int x, y, mask;
589 :
590 16 : if (!VC_UNI_SCREEN_DEBUG || !uniscr)
591 16 : return;
592 :
593 : WARN_CONSOLE_UNLOCKED();
594 :
595 : /*
596 : * Make sure our unicode screen translates into the same glyphs
597 : * as the actual screen. This is brutal indeed.
598 : */
599 : p = (unsigned short *)vc->vc_origin;
600 : mask = vc->vc_hi_font_mask | 0xff;
601 : for (y = 0; y < vc->vc_rows; y++) {
602 : char32_t *line = uniscr->lines[y];
603 : for (x = 0; x < vc->vc_cols; x++) {
604 : u16 glyph = scr_readw(p++) & mask;
605 : char32_t uc = line[x];
606 : int tc = conv_uni_to_pc(vc, uc);
607 : if (tc == -4)
608 : tc = conv_uni_to_pc(vc, 0xfffd);
609 : if (tc == -4)
610 : tc = conv_uni_to_pc(vc, '?');
611 : if (tc != glyph)
612 : pr_err_ratelimited(
613 : "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
614 : __func__, x, y, glyph, tc);
615 : }
616 : }
617 : }
618 :
619 :
620 0 : static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
621 : enum con_scroll dir, unsigned int nr)
622 : {
623 0 : u16 *clear, *d, *s;
624 :
625 0 : if (t + nr >= b)
626 0 : nr = b - t - 1;
627 0 : if (b > vc->vc_rows || t >= b || nr < 1)
628 : return;
629 0 : vc_uniscr_scroll(vc, t, b, dir, nr);
630 0 : if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
631 : return;
632 :
633 0 : s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
634 0 : d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
635 :
636 0 : if (dir == SM_UP) {
637 0 : clear = s + (b - t - nr) * vc->vc_cols;
638 0 : swap(s, d);
639 : }
640 0 : scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
641 0 : scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
642 : }
643 :
644 2 : static void do_update_region(struct vc_data *vc, unsigned long start, int count)
645 : {
646 2 : unsigned int xx, yy, offset;
647 2 : u16 *p;
648 :
649 2 : p = (u16 *) start;
650 2 : if (!vc->vc_sw->con_getxy) {
651 2 : offset = (start - vc->vc_origin) / 2;
652 2 : xx = offset % vc->vc_cols;
653 2 : yy = offset / vc->vc_cols;
654 : } else {
655 0 : int nxx, nyy;
656 0 : start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
657 0 : xx = nxx; yy = nyy;
658 : }
659 50 : for(;;) {
660 50 : u16 attrib = scr_readw(p) & 0xff00;
661 50 : int startx = xx;
662 50 : u16 *q = p;
663 4050 : while (xx < vc->vc_cols && count) {
664 4000 : if (attrib != (scr_readw(p) & 0xff00)) {
665 0 : if (p > q)
666 0 : vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
667 0 : startx = xx;
668 0 : q = p;
669 0 : attrib = scr_readw(p) & 0xff00;
670 : }
671 4000 : p++;
672 4000 : xx++;
673 4000 : count--;
674 : }
675 50 : if (p > q)
676 50 : vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
677 50 : if (!count)
678 : break;
679 48 : xx = 0;
680 48 : yy++;
681 48 : if (vc->vc_sw->con_getxy) {
682 0 : p = (u16 *)start;
683 0 : start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
684 : }
685 : }
686 2 : }
687 :
688 0 : void update_region(struct vc_data *vc, unsigned long start, int count)
689 : {
690 0 : WARN_CONSOLE_UNLOCKED();
691 :
692 0 : if (con_should_update(vc)) {
693 0 : hide_cursor(vc);
694 0 : do_update_region(vc, start, count);
695 0 : set_cursor(vc);
696 : }
697 0 : }
698 :
699 : /* Structure of attributes is hardware-dependent */
700 :
701 12 : static u8 build_attr(struct vc_data *vc, u8 _color,
702 : enum vc_intensity _intensity, bool _blink, bool _underline,
703 : bool _reverse, bool _italic)
704 : {
705 12 : if (vc->vc_sw->con_build_attr)
706 0 : return vc->vc_sw->con_build_attr(vc, _color, _intensity,
707 : _blink, _underline, _reverse, _italic);
708 :
709 : /*
710 : * ++roman: I completely changed the attribute format for monochrome
711 : * mode (!can_do_color). The formerly used MDA (monochrome display
712 : * adapter) format didn't allow the combination of certain effects.
713 : * Now the attribute is just a bit vector:
714 : * Bit 0..1: intensity (0..2)
715 : * Bit 2 : underline
716 : * Bit 3 : reverse
717 : * Bit 7 : blink
718 : */
719 : {
720 12 : u8 a = _color;
721 12 : if (!vc->vc_can_do_color)
722 0 : return _intensity |
723 0 : (_italic << 1) |
724 0 : (_underline << 2) |
725 0 : (_reverse << 3) |
726 0 : (_blink << 7);
727 12 : if (_italic)
728 0 : a = (a & 0xF0) | vc->vc_itcolor;
729 12 : else if (_underline)
730 0 : a = (a & 0xf0) | vc->vc_ulcolor;
731 12 : else if (_intensity == VCI_HALF_BRIGHT)
732 0 : a = (a & 0xf0) | vc->vc_halfcolor;
733 12 : if (_reverse)
734 0 : a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
735 12 : if (_blink)
736 0 : a ^= 0x80;
737 12 : if (_intensity == VCI_BOLD)
738 0 : a ^= 0x08;
739 12 : if (vc->vc_hi_font_mask == 0x100)
740 0 : a <<= 1;
741 : return a;
742 : }
743 : }
744 :
745 6 : static void update_attr(struct vc_data *vc)
746 : {
747 12 : vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
748 6 : vc->state.blink, vc->state.underline,
749 6 : vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
750 12 : vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
751 6 : VCI_NORMAL, vc->state.blink, false,
752 6 : vc->vc_decscnm, false) << 8);
753 6 : }
754 :
755 : /* Note: inverting the screen twice should revert to the original state */
756 0 : void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
757 : {
758 0 : unsigned short *p;
759 :
760 0 : WARN_CONSOLE_UNLOCKED();
761 :
762 0 : count /= 2;
763 0 : p = screenpos(vc, offset, viewed);
764 0 : if (vc->vc_sw->con_invert_region) {
765 0 : vc->vc_sw->con_invert_region(vc, p, count);
766 : } else {
767 0 : u16 *q = p;
768 0 : int cnt = count;
769 0 : u16 a;
770 :
771 0 : if (!vc->vc_can_do_color) {
772 0 : while (cnt--) {
773 0 : a = scr_readw(q);
774 0 : a ^= 0x0800;
775 0 : scr_writew(a, q);
776 0 : q++;
777 : }
778 0 : } else if (vc->vc_hi_font_mask == 0x100) {
779 0 : while (cnt--) {
780 0 : a = scr_readw(q);
781 0 : a = (a & 0x11ff) |
782 0 : ((a & 0xe000) >> 4) |
783 0 : ((a & 0x0e00) << 4);
784 0 : scr_writew(a, q);
785 0 : q++;
786 : }
787 : } else {
788 0 : while (cnt--) {
789 0 : a = scr_readw(q);
790 0 : a = (a & 0x88ff) |
791 0 : ((a & 0x7000) >> 4) |
792 0 : ((a & 0x0700) << 4);
793 0 : scr_writew(a, q);
794 0 : q++;
795 : }
796 : }
797 : }
798 :
799 0 : if (con_should_update(vc))
800 0 : do_update_region(vc, (unsigned long) p, count);
801 0 : notify_update(vc);
802 0 : }
803 :
804 : /* used by selection: complement pointer position */
805 0 : void complement_pos(struct vc_data *vc, int offset)
806 : {
807 0 : static int old_offset = -1;
808 0 : static unsigned short old;
809 0 : static unsigned short oldx, oldy;
810 :
811 0 : WARN_CONSOLE_UNLOCKED();
812 :
813 0 : if (old_offset != -1 && old_offset >= 0 &&
814 0 : old_offset < vc->vc_screenbuf_size) {
815 0 : scr_writew(old, screenpos(vc, old_offset, true));
816 0 : if (con_should_update(vc))
817 0 : vc->vc_sw->con_putc(vc, old, oldy, oldx);
818 0 : notify_update(vc);
819 : }
820 :
821 0 : old_offset = offset;
822 :
823 0 : if (offset != -1 && offset >= 0 &&
824 0 : offset < vc->vc_screenbuf_size) {
825 0 : unsigned short new;
826 0 : unsigned short *p;
827 0 : p = screenpos(vc, offset, true);
828 0 : old = scr_readw(p);
829 0 : new = old ^ vc->vc_complement_mask;
830 0 : scr_writew(new, p);
831 0 : if (con_should_update(vc)) {
832 0 : oldx = (offset >> 1) % vc->vc_cols;
833 0 : oldy = (offset >> 1) / vc->vc_cols;
834 0 : vc->vc_sw->con_putc(vc, new, oldy, oldx);
835 : }
836 0 : notify_update(vc);
837 : }
838 0 : }
839 :
840 0 : static void insert_char(struct vc_data *vc, unsigned int nr)
841 : {
842 0 : unsigned short *p = (unsigned short *) vc->vc_pos;
843 :
844 0 : vc_uniscr_insert(vc, nr);
845 0 : scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
846 0 : scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
847 0 : vc->vc_need_wrap = 0;
848 0 : if (con_should_update(vc))
849 0 : do_update_region(vc, (unsigned long) p,
850 0 : vc->vc_cols - vc->state.x);
851 0 : }
852 :
853 0 : static void delete_char(struct vc_data *vc, unsigned int nr)
854 : {
855 0 : unsigned short *p = (unsigned short *) vc->vc_pos;
856 :
857 0 : vc_uniscr_delete(vc, nr);
858 0 : scr_memcpyw(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
859 0 : scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
860 : nr * 2);
861 0 : vc->vc_need_wrap = 0;
862 0 : if (con_should_update(vc))
863 0 : do_update_region(vc, (unsigned long) p,
864 0 : vc->vc_cols - vc->state.x);
865 0 : }
866 :
867 : static int softcursor_original = -1;
868 :
869 20 : static void add_softcursor(struct vc_data *vc)
870 : {
871 20 : int i = scr_readw((u16 *) vc->vc_pos);
872 20 : u32 type = vc->vc_cursor_type;
873 :
874 20 : if (!(type & CUR_SW))
875 : return;
876 0 : if (softcursor_original != -1)
877 : return;
878 0 : softcursor_original = i;
879 0 : i |= CUR_SET(type);
880 0 : i ^= CUR_CHANGE(type);
881 0 : if ((type & CUR_ALWAYS_BG) &&
882 0 : (softcursor_original & CUR_BG) == (i & CUR_BG))
883 0 : i ^= CUR_BG;
884 0 : if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
885 0 : i ^= CUR_FG;
886 0 : scr_writew(i, (u16 *)vc->vc_pos);
887 0 : if (con_should_update(vc))
888 0 : vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x);
889 : }
890 :
891 13 : static void hide_softcursor(struct vc_data *vc)
892 : {
893 13 : if (softcursor_original != -1) {
894 0 : scr_writew(softcursor_original, (u16 *)vc->vc_pos);
895 0 : if (con_should_update(vc))
896 0 : vc->vc_sw->con_putc(vc, softcursor_original,
897 0 : vc->state.y, vc->state.x);
898 0 : softcursor_original = -1;
899 : }
900 13 : }
901 :
902 13 : static void hide_cursor(struct vc_data *vc)
903 : {
904 13 : if (vc_is_sel(vc))
905 0 : clear_selection();
906 :
907 13 : vc->vc_sw->con_cursor(vc, CM_ERASE);
908 13 : hide_softcursor(vc);
909 13 : }
910 :
911 30 : static void set_cursor(struct vc_data *vc)
912 : {
913 30 : if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
914 : return;
915 20 : if (vc->vc_deccm) {
916 20 : if (vc_is_sel(vc))
917 0 : clear_selection();
918 20 : add_softcursor(vc);
919 20 : if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
920 20 : vc->vc_sw->con_cursor(vc, CM_DRAW);
921 : } else
922 0 : hide_cursor(vc);
923 : }
924 :
925 9 : static void set_origin(struct vc_data *vc)
926 : {
927 9 : WARN_CONSOLE_UNLOCKED();
928 :
929 9 : if (!con_is_visible(vc) ||
930 3 : !vc->vc_sw->con_set_origin ||
931 0 : !vc->vc_sw->con_set_origin(vc))
932 9 : vc->vc_origin = (unsigned long)vc->vc_screenbuf;
933 9 : vc->vc_visible_origin = vc->vc_origin;
934 9 : vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
935 9 : vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
936 9 : 2 * vc->state.x;
937 9 : }
938 :
939 1 : static void save_screen(struct vc_data *vc)
940 : {
941 1 : WARN_CONSOLE_UNLOCKED();
942 :
943 1 : if (vc->vc_sw->con_save_screen)
944 0 : vc->vc_sw->con_save_screen(vc);
945 1 : }
946 :
947 1 : static void flush_scrollback(struct vc_data *vc)
948 : {
949 1 : WARN_CONSOLE_UNLOCKED();
950 :
951 1 : set_origin(vc);
952 1 : if (vc->vc_sw->con_flush_scrollback) {
953 0 : vc->vc_sw->con_flush_scrollback(vc);
954 1 : } else if (con_is_visible(vc)) {
955 : /*
956 : * When no con_flush_scrollback method is provided then the
957 : * legacy way for flushing the scrollback buffer is to use
958 : * a side effect of the con_switch method. We do it only on
959 : * the foreground console as background consoles have no
960 : * scrollback buffers in that case and we obviously don't
961 : * want to switch to them.
962 : */
963 1 : hide_cursor(vc);
964 1 : vc->vc_sw->con_switch(vc);
965 1 : set_cursor(vc);
966 : }
967 1 : }
968 :
969 : /*
970 : * Redrawing of screen
971 : */
972 :
973 0 : void clear_buffer_attributes(struct vc_data *vc)
974 : {
975 0 : unsigned short *p = (unsigned short *)vc->vc_origin;
976 0 : int count = vc->vc_screenbuf_size / 2;
977 0 : int mask = vc->vc_hi_font_mask | 0xff;
978 :
979 0 : for (; count > 0; count--, p++) {
980 0 : scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
981 : }
982 0 : }
983 :
984 1 : void redraw_screen(struct vc_data *vc, int is_switch)
985 : {
986 1 : int redraw = 0;
987 :
988 1 : WARN_CONSOLE_UNLOCKED();
989 :
990 1 : if (!vc) {
991 : /* strange ... */
992 : /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
993 : return;
994 : }
995 :
996 1 : if (is_switch) {
997 0 : struct vc_data *old_vc = vc_cons[fg_console].d;
998 0 : if (old_vc == vc)
999 : return;
1000 0 : if (!con_is_visible(vc))
1001 0 : redraw = 1;
1002 0 : *vc->vc_display_fg = vc;
1003 0 : fg_console = vc->vc_num;
1004 0 : hide_cursor(old_vc);
1005 0 : if (!con_is_visible(old_vc)) {
1006 0 : save_screen(old_vc);
1007 0 : set_origin(old_vc);
1008 : }
1009 0 : if (tty0dev)
1010 0 : sysfs_notify(&tty0dev->kobj, NULL, "active");
1011 : } else {
1012 1 : hide_cursor(vc);
1013 1 : redraw = 1;
1014 : }
1015 :
1016 1 : if (redraw) {
1017 1 : int update;
1018 1 : int old_was_color = vc->vc_can_do_color;
1019 :
1020 1 : set_origin(vc);
1021 1 : update = vc->vc_sw->con_switch(vc);
1022 1 : set_palette(vc);
1023 : /*
1024 : * If console changed from mono<->color, the best we can do
1025 : * is to clear the buffer attributes. As it currently stands,
1026 : * rebuilding new attributes from the old buffer is not doable
1027 : * without overly complex code.
1028 : */
1029 1 : if (old_was_color != vc->vc_can_do_color) {
1030 0 : update_attr(vc);
1031 0 : clear_buffer_attributes(vc);
1032 : }
1033 :
1034 1 : if (update && vc->vc_mode != KD_GRAPHICS)
1035 0 : do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1036 : }
1037 1 : set_cursor(vc);
1038 1 : if (is_switch) {
1039 0 : vt_set_leds_compute_shiftstate();
1040 0 : notify_update(vc);
1041 : }
1042 : }
1043 :
1044 : /*
1045 : * Allocation, freeing and resizing of VTs.
1046 : */
1047 :
1048 142 : int vc_cons_allocated(unsigned int i)
1049 : {
1050 142 : return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1051 : }
1052 :
1053 6 : static void visual_init(struct vc_data *vc, int num, int init)
1054 : {
1055 : /* ++Geert: vc->vc_sw->con_init determines console size */
1056 6 : if (vc->vc_sw)
1057 6 : module_put(vc->vc_sw->owner);
1058 6 : vc->vc_sw = conswitchp;
1059 : #ifndef VT_SINGLE_DRIVER
1060 6 : if (con_driver_map[num])
1061 6 : vc->vc_sw = con_driver_map[num];
1062 : #endif
1063 6 : __module_get(vc->vc_sw->owner);
1064 6 : vc->vc_num = num;
1065 6 : vc->vc_display_fg = &master_display_fg;
1066 6 : if (vc->vc_uni_pagedir_loc)
1067 0 : con_free_unimap(vc);
1068 6 : vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
1069 6 : vc->vc_uni_pagedir = NULL;
1070 6 : vc->vc_hi_font_mask = 0;
1071 6 : vc->vc_complement_mask = 0;
1072 6 : vc->vc_can_do_color = 0;
1073 6 : vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1074 6 : vc->vc_sw->con_init(vc, init);
1075 6 : if (!vc->vc_complement_mask)
1076 6 : vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1077 6 : vc->vc_s_complement_mask = vc->vc_complement_mask;
1078 6 : vc->vc_size_row = vc->vc_cols << 1;
1079 6 : vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1080 6 : }
1081 :
1082 :
1083 0 : static void visual_deinit(struct vc_data *vc)
1084 : {
1085 0 : vc->vc_sw->con_deinit(vc);
1086 0 : module_put(vc->vc_sw->owner);
1087 : }
1088 :
1089 0 : static void vc_port_destruct(struct tty_port *port)
1090 : {
1091 0 : struct vc_data *vc = container_of(port, struct vc_data, port);
1092 :
1093 0 : kfree(vc);
1094 0 : }
1095 :
1096 : static const struct tty_port_operations vc_port_ops = {
1097 : .destruct = vc_port_destruct,
1098 : };
1099 :
1100 : /*
1101 : * Change # of rows and columns (0 means unchanged/the size of fg_console)
1102 : * [this is to be used together with some user program
1103 : * like resize that changes the hardware videomode]
1104 : */
1105 : #define VC_MAXCOL (32767)
1106 : #define VC_MAXROW (32767)
1107 :
1108 28 : int vc_allocate(unsigned int currcons) /* return 0 on success */
1109 : {
1110 28 : struct vt_notifier_param param;
1111 28 : struct vc_data *vc;
1112 28 : int err;
1113 :
1114 28 : WARN_CONSOLE_UNLOCKED();
1115 :
1116 28 : if (currcons >= MAX_NR_CONSOLES)
1117 : return -ENXIO;
1118 :
1119 28 : if (vc_cons[currcons].d)
1120 : return 0;
1121 :
1122 : /* due to the granularity of kmalloc, we waste some memory here */
1123 : /* the alloc is done in two steps, to optimize the common situation
1124 : of a 25x80 console (structsize=216, screenbuf_size=4000) */
1125 : /* although the numbers above are not valid since long ago, the
1126 : point is still up-to-date and the comment still has its value
1127 : even if only as a historical artifact. --mj, July 1998 */
1128 5 : param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1129 5 : if (!vc)
1130 : return -ENOMEM;
1131 :
1132 5 : vc_cons[currcons].d = vc;
1133 5 : tty_port_init(&vc->port);
1134 5 : vc->port.ops = &vc_port_ops;
1135 5 : INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1136 :
1137 5 : visual_init(vc, currcons, 1);
1138 :
1139 5 : if (!*vc->vc_uni_pagedir_loc)
1140 5 : con_set_default_unimap(vc);
1141 :
1142 5 : err = -EINVAL;
1143 5 : if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1144 5 : vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1145 0 : goto err_free;
1146 5 : err = -ENOMEM;
1147 5 : vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1148 5 : if (!vc->vc_screenbuf)
1149 0 : goto err_free;
1150 :
1151 : /* If no drivers have overridden us and the user didn't pass a
1152 : boot option, default to displaying the cursor */
1153 5 : if (global_cursor_default == -1)
1154 1 : global_cursor_default = 1;
1155 :
1156 5 : vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1157 5 : vcs_make_sysfs(currcons);
1158 5 : atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
1159 :
1160 5 : return 0;
1161 0 : err_free:
1162 0 : visual_deinit(vc);
1163 0 : kfree(vc);
1164 0 : vc_cons[currcons].d = NULL;
1165 0 : return err;
1166 : }
1167 :
1168 0 : static inline int resize_screen(struct vc_data *vc, int width, int height,
1169 : int user)
1170 : {
1171 : /* Resizes the resolution of the display adapater */
1172 0 : int err = 0;
1173 :
1174 0 : if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
1175 0 : err = vc->vc_sw->con_resize(vc, width, height, user);
1176 :
1177 0 : return err;
1178 : }
1179 :
1180 : /**
1181 : * vc_do_resize - resizing method for the tty
1182 : * @tty: tty being resized
1183 : * @vc: virtual console private data
1184 : * @cols: columns
1185 : * @lines: lines
1186 : *
1187 : * Resize a virtual console, clipping according to the actual constraints.
1188 : * If the caller passes a tty structure then update the termios winsize
1189 : * information and perform any necessary signal handling.
1190 : *
1191 : * Caller must hold the console semaphore. Takes the termios rwsem and
1192 : * ctrl_lock of the tty IFF a tty is passed.
1193 : */
1194 :
1195 0 : static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1196 : unsigned int cols, unsigned int lines)
1197 : {
1198 0 : unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1199 0 : unsigned long end;
1200 0 : unsigned int old_rows, old_row_size, first_copied_row;
1201 0 : unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1202 0 : unsigned int user;
1203 0 : unsigned short *oldscreen, *newscreen;
1204 0 : struct uni_screen *new_uniscr = NULL;
1205 :
1206 0 : WARN_CONSOLE_UNLOCKED();
1207 :
1208 0 : if (!vc)
1209 : return -ENXIO;
1210 :
1211 0 : user = vc->vc_resize_user;
1212 0 : vc->vc_resize_user = 0;
1213 :
1214 0 : if (cols > VC_MAXCOL || lines > VC_MAXROW)
1215 : return -EINVAL;
1216 :
1217 0 : new_cols = (cols ? cols : vc->vc_cols);
1218 0 : new_rows = (lines ? lines : vc->vc_rows);
1219 0 : new_row_size = new_cols << 1;
1220 0 : new_screen_size = new_row_size * new_rows;
1221 :
1222 0 : if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1223 : return 0;
1224 :
1225 0 : if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1226 : return -EINVAL;
1227 0 : newscreen = kzalloc(new_screen_size, GFP_USER);
1228 0 : if (!newscreen)
1229 : return -ENOMEM;
1230 :
1231 0 : if (get_vc_uniscr(vc)) {
1232 0 : new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1233 0 : if (!new_uniscr) {
1234 0 : kfree(newscreen);
1235 0 : return -ENOMEM;
1236 : }
1237 : }
1238 :
1239 0 : if (vc_is_sel(vc))
1240 0 : clear_selection();
1241 :
1242 0 : old_rows = vc->vc_rows;
1243 0 : old_row_size = vc->vc_size_row;
1244 :
1245 0 : err = resize_screen(vc, new_cols, new_rows, user);
1246 0 : if (err) {
1247 0 : kfree(newscreen);
1248 0 : vc_uniscr_free(new_uniscr);
1249 0 : return err;
1250 : }
1251 :
1252 0 : vc->vc_rows = new_rows;
1253 0 : vc->vc_cols = new_cols;
1254 0 : vc->vc_size_row = new_row_size;
1255 0 : vc->vc_screenbuf_size = new_screen_size;
1256 :
1257 0 : rlth = min(old_row_size, new_row_size);
1258 0 : rrem = new_row_size - rlth;
1259 0 : old_origin = vc->vc_origin;
1260 0 : new_origin = (long) newscreen;
1261 0 : new_scr_end = new_origin + new_screen_size;
1262 :
1263 0 : if (vc->state.y > new_rows) {
1264 0 : if (old_rows - vc->state.y < new_rows) {
1265 : /*
1266 : * Cursor near the bottom, copy contents from the
1267 : * bottom of buffer
1268 : */
1269 0 : first_copied_row = (old_rows - new_rows);
1270 : } else {
1271 : /*
1272 : * Cursor is in no man's land, copy 1/2 screenful
1273 : * from the top and bottom of cursor position
1274 : */
1275 0 : first_copied_row = (vc->state.y - new_rows/2);
1276 : }
1277 0 : old_origin += first_copied_row * old_row_size;
1278 : } else
1279 : first_copied_row = 0;
1280 0 : end = old_origin + old_row_size * min(old_rows, new_rows);
1281 :
1282 0 : vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1283 0 : get_vc_uniscr(vc), rlth/2, first_copied_row,
1284 0 : min(old_rows, new_rows));
1285 0 : vc_uniscr_set(vc, new_uniscr);
1286 :
1287 0 : update_attr(vc);
1288 :
1289 0 : while (old_origin < end) {
1290 0 : scr_memcpyw((unsigned short *) new_origin,
1291 : (unsigned short *) old_origin, rlth);
1292 0 : if (rrem)
1293 0 : scr_memsetw((void *)(new_origin + rlth),
1294 0 : vc->vc_video_erase_char, rrem);
1295 0 : old_origin += old_row_size;
1296 0 : new_origin += new_row_size;
1297 : }
1298 0 : if (new_scr_end > new_origin)
1299 0 : scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1300 : new_scr_end - new_origin);
1301 0 : oldscreen = vc->vc_screenbuf;
1302 0 : vc->vc_screenbuf = newscreen;
1303 0 : vc->vc_screenbuf_size = new_screen_size;
1304 0 : set_origin(vc);
1305 0 : kfree(oldscreen);
1306 :
1307 : /* do part of a reset_terminal() */
1308 0 : vc->vc_top = 0;
1309 0 : vc->vc_bottom = vc->vc_rows;
1310 0 : gotoxy(vc, vc->state.x, vc->state.y);
1311 0 : save_cur(vc);
1312 :
1313 0 : if (tty) {
1314 : /* Rewrite the requested winsize data with the actual
1315 : resulting sizes */
1316 0 : struct winsize ws;
1317 0 : memset(&ws, 0, sizeof(ws));
1318 0 : ws.ws_row = vc->vc_rows;
1319 0 : ws.ws_col = vc->vc_cols;
1320 0 : ws.ws_ypixel = vc->vc_scan_lines;
1321 0 : tty_do_resize(tty, &ws);
1322 : }
1323 :
1324 0 : if (con_is_visible(vc))
1325 0 : update_screen(vc);
1326 0 : vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1327 0 : notify_update(vc);
1328 0 : return err;
1329 : }
1330 :
1331 : /**
1332 : * vc_resize - resize a VT
1333 : * @vc: virtual console
1334 : * @cols: columns
1335 : * @rows: rows
1336 : *
1337 : * Resize a virtual console as seen from the console end of things. We
1338 : * use the common vc_do_resize methods to update the structures. The
1339 : * caller must hold the console sem to protect console internals and
1340 : * vc->port.tty
1341 : */
1342 :
1343 0 : int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1344 : {
1345 0 : return vc_do_resize(vc->port.tty, vc, cols, rows);
1346 : }
1347 :
1348 : /**
1349 : * vt_resize - resize a VT
1350 : * @tty: tty to resize
1351 : * @ws: winsize attributes
1352 : *
1353 : * Resize a virtual terminal. This is called by the tty layer as we
1354 : * register our own handler for resizing. The mutual helper does all
1355 : * the actual work.
1356 : *
1357 : * Takes the console sem and the called methods then take the tty
1358 : * termios_rwsem and the tty ctrl_lock in that order.
1359 : */
1360 0 : static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1361 : {
1362 0 : struct vc_data *vc = tty->driver_data;
1363 0 : int ret;
1364 :
1365 0 : console_lock();
1366 0 : ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1367 0 : console_unlock();
1368 0 : return ret;
1369 : }
1370 :
1371 0 : struct vc_data *vc_deallocate(unsigned int currcons)
1372 : {
1373 0 : struct vc_data *vc = NULL;
1374 :
1375 0 : WARN_CONSOLE_UNLOCKED();
1376 :
1377 0 : if (vc_cons_allocated(currcons)) {
1378 0 : struct vt_notifier_param param;
1379 :
1380 0 : param.vc = vc = vc_cons[currcons].d;
1381 0 : atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1382 0 : vcs_remove_sysfs(currcons);
1383 0 : visual_deinit(vc);
1384 0 : put_pid(vc->vt_pid);
1385 0 : vc_uniscr_set(vc, NULL);
1386 0 : kfree(vc->vc_screenbuf);
1387 0 : vc_cons[currcons].d = NULL;
1388 : }
1389 0 : return vc;
1390 : }
1391 :
1392 : /*
1393 : * VT102 emulator
1394 : */
1395 :
1396 : enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1397 :
1398 : #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1399 : #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1400 : #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1401 :
1402 : #define decarm VC_REPEAT
1403 : #define decckm VC_CKMODE
1404 : #define kbdapplic VC_APPLIC
1405 : #define lnm VC_CRLF
1406 :
1407 : const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1408 : 8,12,10,14, 9,13,11,15 };
1409 :
1410 : /* the default colour table, for VGA+ colour systems */
1411 : unsigned char default_red[] = {
1412 : 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1413 : 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1414 : };
1415 : module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1416 :
1417 : unsigned char default_grn[] = {
1418 : 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1419 : 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1420 : };
1421 : module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1422 :
1423 : unsigned char default_blu[] = {
1424 : 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1425 : 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1426 : };
1427 : module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1428 :
1429 : /*
1430 : * gotoxy() must verify all boundaries, because the arguments
1431 : * might also be negative. If the given position is out of
1432 : * bounds, the cursor is placed at the nearest margin.
1433 : */
1434 9 : static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1435 : {
1436 9 : int min_y, max_y;
1437 :
1438 9 : if (new_x < 0)
1439 0 : vc->state.x = 0;
1440 : else {
1441 9 : if (new_x >= vc->vc_cols)
1442 0 : vc->state.x = vc->vc_cols - 1;
1443 : else
1444 9 : vc->state.x = new_x;
1445 : }
1446 :
1447 9 : if (vc->vc_decom) {
1448 0 : min_y = vc->vc_top;
1449 0 : max_y = vc->vc_bottom;
1450 : } else {
1451 9 : min_y = 0;
1452 9 : max_y = vc->vc_rows;
1453 : }
1454 9 : if (new_y < min_y)
1455 0 : vc->state.y = min_y;
1456 9 : else if (new_y >= max_y)
1457 0 : vc->state.y = max_y - 1;
1458 : else
1459 9 : vc->state.y = new_y;
1460 9 : vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1461 9 : (vc->state.x << 1);
1462 9 : vc->vc_need_wrap = 0;
1463 9 : }
1464 :
1465 : /* for absolute user moves, when decom is set */
1466 2 : static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1467 : {
1468 2 : gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1469 2 : }
1470 :
1471 0 : void scrollback(struct vc_data *vc)
1472 : {
1473 0 : scrolldelta(-(vc->vc_rows / 2));
1474 0 : }
1475 :
1476 0 : void scrollfront(struct vc_data *vc, int lines)
1477 : {
1478 0 : if (!lines)
1479 0 : lines = vc->vc_rows / 2;
1480 0 : scrolldelta(lines);
1481 0 : }
1482 :
1483 3 : static void lf(struct vc_data *vc)
1484 : {
1485 : /* don't scroll if above bottom of scrolling region, or
1486 : * if below scrolling region
1487 : */
1488 3 : if (vc->state.y + 1 == vc->vc_bottom)
1489 0 : con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1490 3 : else if (vc->state.y < vc->vc_rows - 1) {
1491 3 : vc->state.y++;
1492 3 : vc->vc_pos += vc->vc_size_row;
1493 : }
1494 3 : vc->vc_need_wrap = 0;
1495 3 : notify_write(vc, '\n');
1496 3 : }
1497 :
1498 0 : static void ri(struct vc_data *vc)
1499 : {
1500 : /* don't scroll if below top of scrolling region, or
1501 : * if above scrolling region
1502 : */
1503 0 : if (vc->state.y == vc->vc_top)
1504 0 : con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1505 0 : else if (vc->state.y > 0) {
1506 0 : vc->state.y--;
1507 0 : vc->vc_pos -= vc->vc_size_row;
1508 : }
1509 0 : vc->vc_need_wrap = 0;
1510 0 : }
1511 :
1512 4 : static inline void cr(struct vc_data *vc)
1513 : {
1514 4 : vc->vc_pos -= vc->state.x << 1;
1515 4 : vc->vc_need_wrap = vc->state.x = 0;
1516 4 : notify_write(vc, '\r');
1517 4 : }
1518 :
1519 0 : static inline void bs(struct vc_data *vc)
1520 : {
1521 0 : if (vc->state.x) {
1522 0 : vc->vc_pos -= 2;
1523 0 : vc->state.x--;
1524 0 : vc->vc_need_wrap = 0;
1525 0 : notify_write(vc, '\b');
1526 : }
1527 0 : }
1528 :
1529 : static inline void del(struct vc_data *vc)
1530 : {
1531 : /* ignored */
1532 : }
1533 :
1534 8 : static void csi_J(struct vc_data *vc, int vpar)
1535 : {
1536 8 : unsigned int count;
1537 8 : unsigned short * start;
1538 :
1539 8 : switch (vpar) {
1540 1 : case 0: /* erase from cursor to end of display */
1541 2 : vc_uniscr_clear_line(vc, vc->state.x,
1542 1 : vc->vc_cols - vc->state.x);
1543 1 : vc_uniscr_clear_lines(vc, vc->state.y + 1,
1544 1 : vc->vc_rows - vc->state.y - 1);
1545 1 : count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1546 1 : start = (unsigned short *)vc->vc_pos;
1547 1 : break;
1548 0 : case 1: /* erase from start to cursor */
1549 0 : vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1550 0 : vc_uniscr_clear_lines(vc, 0, vc->state.y);
1551 0 : count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1552 0 : start = (unsigned short *)vc->vc_origin;
1553 0 : break;
1554 1 : case 3: /* include scrollback */
1555 1 : flush_scrollback(vc);
1556 7 : fallthrough;
1557 7 : case 2: /* erase whole display */
1558 7 : vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1559 7 : count = vc->vc_cols * vc->vc_rows;
1560 7 : start = (unsigned short *)vc->vc_origin;
1561 7 : break;
1562 : default:
1563 : return;
1564 : }
1565 8 : scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1566 8 : if (con_should_update(vc))
1567 2 : do_update_region(vc, (unsigned long) start, count);
1568 8 : vc->vc_need_wrap = 0;
1569 : }
1570 :
1571 0 : static void csi_K(struct vc_data *vc, int vpar)
1572 : {
1573 0 : unsigned int count;
1574 0 : unsigned short *start = (unsigned short *)vc->vc_pos;
1575 0 : int offset;
1576 :
1577 0 : switch (vpar) {
1578 0 : case 0: /* erase from cursor to end of line */
1579 0 : offset = 0;
1580 0 : count = vc->vc_cols - vc->state.x;
1581 0 : break;
1582 0 : case 1: /* erase from start of line to cursor */
1583 0 : offset = -vc->state.x;
1584 0 : count = vc->state.x + 1;
1585 0 : break;
1586 0 : case 2: /* erase whole line */
1587 0 : offset = -vc->state.x;
1588 0 : count = vc->vc_cols;
1589 0 : break;
1590 : default:
1591 : return;
1592 : }
1593 0 : vc_uniscr_clear_line(vc, vc->state.x + offset, count);
1594 0 : scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1595 0 : vc->vc_need_wrap = 0;
1596 0 : if (con_should_update(vc))
1597 0 : do_update_region(vc, (unsigned long)(start + offset), count);
1598 : }
1599 :
1600 : /* erase the following vpar positions */
1601 0 : static void csi_X(struct vc_data *vc, unsigned int vpar)
1602 : { /* not vt100? */
1603 0 : unsigned int count;
1604 :
1605 0 : if (!vpar)
1606 : vpar++;
1607 :
1608 0 : count = min(vpar, vc->vc_cols - vc->state.x);
1609 :
1610 0 : vc_uniscr_clear_line(vc, vc->state.x, count);
1611 0 : scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1612 0 : if (con_should_update(vc))
1613 0 : vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
1614 0 : vc->vc_need_wrap = 0;
1615 0 : }
1616 :
1617 6 : static void default_attr(struct vc_data *vc)
1618 : {
1619 6 : vc->state.intensity = VCI_NORMAL;
1620 6 : vc->state.italic = false;
1621 6 : vc->state.underline = false;
1622 6 : vc->state.reverse = false;
1623 6 : vc->state.blink = false;
1624 6 : vc->state.color = vc->vc_def_color;
1625 0 : }
1626 :
1627 : struct rgb { u8 r; u8 g; u8 b; };
1628 :
1629 0 : static void rgb_from_256(int i, struct rgb *c)
1630 : {
1631 0 : if (i < 8) { /* Standard colours. */
1632 0 : c->r = i&1 ? 0xaa : 0x00;
1633 0 : c->g = i&2 ? 0xaa : 0x00;
1634 0 : c->b = i&4 ? 0xaa : 0x00;
1635 0 : } else if (i < 16) {
1636 0 : c->r = i&1 ? 0xff : 0x55;
1637 0 : c->g = i&2 ? 0xff : 0x55;
1638 0 : c->b = i&4 ? 0xff : 0x55;
1639 0 : } else if (i < 232) { /* 6x6x6 colour cube. */
1640 0 : c->r = (i - 16) / 36 * 85 / 2;
1641 0 : c->g = (i - 16) / 6 % 6 * 85 / 2;
1642 0 : c->b = (i - 16) % 6 * 85 / 2;
1643 : } else /* Grayscale ramp. */
1644 0 : c->r = c->g = c->b = i * 10 - 2312;
1645 0 : }
1646 :
1647 0 : static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1648 : {
1649 0 : u8 hue = 0, max = max3(c->r, c->g, c->b);
1650 :
1651 0 : if (c->r > max / 2)
1652 0 : hue |= 4;
1653 0 : if (c->g > max / 2)
1654 0 : hue |= 2;
1655 0 : if (c->b > max / 2)
1656 0 : hue |= 1;
1657 :
1658 0 : if (hue == 7 && max <= 0x55) {
1659 0 : hue = 0;
1660 0 : vc->state.intensity = VCI_BOLD;
1661 0 : } else if (max > 0xaa)
1662 0 : vc->state.intensity = VCI_BOLD;
1663 : else
1664 0 : vc->state.intensity = VCI_NORMAL;
1665 :
1666 0 : vc->state.color = (vc->state.color & 0xf0) | hue;
1667 0 : }
1668 :
1669 0 : static void rgb_background(struct vc_data *vc, const struct rgb *c)
1670 : {
1671 : /* For backgrounds, err on the dark side. */
1672 0 : vc->state.color = (vc->state.color & 0x0f)
1673 0 : | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1674 0 : }
1675 :
1676 : /*
1677 : * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1678 : * and thus need to be detected and ignored by hand. That standard also
1679 : * wants : rather than ; as separators but sequences containing : are currently
1680 : * completely ignored by the parser.
1681 : *
1682 : * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1683 : * supporting them.
1684 : */
1685 0 : static int vc_t416_color(struct vc_data *vc, int i,
1686 : void(*set_color)(struct vc_data *vc, const struct rgb *c))
1687 : {
1688 0 : struct rgb c;
1689 :
1690 0 : i++;
1691 0 : if (i > vc->vc_npar)
1692 : return i;
1693 :
1694 0 : if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1695 : /* 256 colours */
1696 0 : i++;
1697 0 : rgb_from_256(vc->vc_par[i], &c);
1698 0 : } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1699 : /* 24 bit */
1700 0 : c.r = vc->vc_par[i + 1];
1701 0 : c.g = vc->vc_par[i + 2];
1702 0 : c.b = vc->vc_par[i + 3];
1703 0 : i += 3;
1704 : } else
1705 : return i;
1706 :
1707 0 : set_color(vc, &c);
1708 :
1709 0 : return i;
1710 : }
1711 :
1712 : /* console_lock is held */
1713 0 : static void csi_m(struct vc_data *vc)
1714 : {
1715 0 : int i;
1716 :
1717 0 : for (i = 0; i <= vc->vc_npar; i++)
1718 0 : switch (vc->vc_par[i]) {
1719 : case 0: /* all attributes off */
1720 0 : default_attr(vc);
1721 : break;
1722 0 : case 1:
1723 0 : vc->state.intensity = VCI_BOLD;
1724 0 : break;
1725 0 : case 2:
1726 0 : vc->state.intensity = VCI_HALF_BRIGHT;
1727 0 : break;
1728 0 : case 3:
1729 0 : vc->state.italic = true;
1730 0 : break;
1731 0 : case 21:
1732 : /*
1733 : * No console drivers support double underline, so
1734 : * convert it to a single underline.
1735 : */
1736 : case 4:
1737 0 : vc->state.underline = true;
1738 0 : break;
1739 0 : case 5:
1740 0 : vc->state.blink = true;
1741 0 : break;
1742 0 : case 7:
1743 0 : vc->state.reverse = true;
1744 0 : break;
1745 0 : case 10: /* ANSI X3.64-1979 (SCO-ish?)
1746 : * Select primary font, don't display control chars if
1747 : * defined, don't set bit 8 on output.
1748 : */
1749 0 : vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
1750 0 : vc->vc_disp_ctrl = 0;
1751 0 : vc->vc_toggle_meta = 0;
1752 0 : break;
1753 0 : case 11: /* ANSI X3.64-1979 (SCO-ish?)
1754 : * Select first alternate font, lets chars < 32 be
1755 : * displayed as ROM chars.
1756 : */
1757 0 : vc->vc_translate = set_translate(IBMPC_MAP, vc);
1758 0 : vc->vc_disp_ctrl = 1;
1759 0 : vc->vc_toggle_meta = 0;
1760 0 : break;
1761 0 : case 12: /* ANSI X3.64-1979 (SCO-ish?)
1762 : * Select second alternate font, toggle high bit
1763 : * before displaying as ROM char.
1764 : */
1765 0 : vc->vc_translate = set_translate(IBMPC_MAP, vc);
1766 0 : vc->vc_disp_ctrl = 1;
1767 0 : vc->vc_toggle_meta = 1;
1768 0 : break;
1769 0 : case 22:
1770 0 : vc->state.intensity = VCI_NORMAL;
1771 0 : break;
1772 0 : case 23:
1773 0 : vc->state.italic = false;
1774 0 : break;
1775 0 : case 24:
1776 0 : vc->state.underline = false;
1777 0 : break;
1778 0 : case 25:
1779 0 : vc->state.blink = false;
1780 0 : break;
1781 0 : case 27:
1782 0 : vc->state.reverse = false;
1783 0 : break;
1784 0 : case 38:
1785 0 : i = vc_t416_color(vc, i, rgb_foreground);
1786 0 : break;
1787 0 : case 48:
1788 0 : i = vc_t416_color(vc, i, rgb_background);
1789 0 : break;
1790 0 : case 39:
1791 0 : vc->state.color = (vc->vc_def_color & 0x0f) |
1792 0 : (vc->state.color & 0xf0);
1793 0 : break;
1794 0 : case 49:
1795 0 : vc->state.color = (vc->vc_def_color & 0xf0) |
1796 0 : (vc->state.color & 0x0f);
1797 0 : break;
1798 0 : default:
1799 0 : if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1800 0 : if (vc->vc_par[i] < 100)
1801 0 : vc->state.intensity = VCI_BOLD;
1802 0 : vc->vc_par[i] -= 60;
1803 : }
1804 0 : if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1805 0 : vc->state.color = color_table[vc->vc_par[i] - 30]
1806 0 : | (vc->state.color & 0xf0);
1807 0 : else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1808 0 : vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
1809 0 : | (vc->state.color & 0x0f);
1810 : break;
1811 : }
1812 0 : update_attr(vc);
1813 0 : }
1814 :
1815 0 : static void respond_string(const char *p, size_t len, struct tty_port *port)
1816 : {
1817 0 : tty_insert_flip_string(port, p, len);
1818 0 : tty_schedule_flip(port);
1819 0 : }
1820 :
1821 0 : static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1822 : {
1823 0 : char buf[40];
1824 0 : int len;
1825 :
1826 0 : len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1827 0 : (vc->vc_decom ? vc->vc_top + 1 : 1),
1828 0 : vc->state.x + 1);
1829 0 : respond_string(buf, len, tty->port);
1830 0 : }
1831 :
1832 0 : static inline void status_report(struct tty_struct *tty)
1833 : {
1834 0 : static const char teminal_ok[] = "\033[0n";
1835 :
1836 0 : respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1837 0 : }
1838 :
1839 0 : static inline void respond_ID(struct tty_struct *tty)
1840 : {
1841 : /* terminal answer to an ESC-Z or csi0c query. */
1842 0 : static const char vt102_id[] = "\033[?6c";
1843 :
1844 0 : respond_string(vt102_id, strlen(vt102_id), tty->port);
1845 0 : }
1846 :
1847 0 : void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1848 : {
1849 0 : char buf[8];
1850 0 : int len;
1851 :
1852 0 : len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1853 0 : (char)('!' + mrx), (char)('!' + mry));
1854 0 : respond_string(buf, len, tty->port);
1855 0 : }
1856 :
1857 : /* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1858 0 : int mouse_reporting(void)
1859 : {
1860 0 : return vc_cons[fg_console].d->vc_report_mouse;
1861 : }
1862 :
1863 : /* console_lock is held */
1864 0 : static void set_mode(struct vc_data *vc, int on_off)
1865 : {
1866 0 : int i;
1867 :
1868 0 : for (i = 0; i <= vc->vc_npar; i++)
1869 0 : if (vc->vc_priv == EPdec) {
1870 0 : switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1871 0 : case 1: /* Cursor keys send ^[Ox/^[[x */
1872 0 : if (on_off)
1873 0 : set_kbd(vc, decckm);
1874 : else
1875 0 : clr_kbd(vc, decckm);
1876 : break;
1877 : case 3: /* 80/132 mode switch unimplemented */
1878 : #if 0
1879 : vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1880 : /* this alone does not suffice; some user mode
1881 : utility has to change the hardware regs */
1882 : #endif
1883 : break;
1884 0 : case 5: /* Inverted screen on/off */
1885 0 : if (vc->vc_decscnm != on_off) {
1886 0 : vc->vc_decscnm = on_off;
1887 0 : invert_screen(vc, 0,
1888 0 : vc->vc_screenbuf_size,
1889 : false);
1890 0 : update_attr(vc);
1891 : }
1892 : break;
1893 0 : case 6: /* Origin relative/absolute */
1894 0 : vc->vc_decom = on_off;
1895 0 : gotoxay(vc, 0, 0);
1896 0 : break;
1897 0 : case 7: /* Autowrap on/off */
1898 0 : vc->vc_decawm = on_off;
1899 0 : break;
1900 0 : case 8: /* Autorepeat on/off */
1901 0 : if (on_off)
1902 0 : set_kbd(vc, decarm);
1903 : else
1904 0 : clr_kbd(vc, decarm);
1905 : break;
1906 0 : case 9:
1907 0 : vc->vc_report_mouse = on_off ? 1 : 0;
1908 0 : break;
1909 0 : case 25: /* Cursor on/off */
1910 0 : vc->vc_deccm = on_off;
1911 0 : break;
1912 0 : case 1000:
1913 0 : vc->vc_report_mouse = on_off ? 2 : 0;
1914 0 : break;
1915 : }
1916 : } else {
1917 0 : switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1918 0 : case 3: /* Monitor (display ctrls) */
1919 0 : vc->vc_disp_ctrl = on_off;
1920 0 : break;
1921 0 : case 4: /* Insert Mode on/off */
1922 0 : vc->vc_decim = on_off;
1923 0 : break;
1924 0 : case 20: /* Lf, Enter == CrLf/Lf */
1925 0 : if (on_off)
1926 0 : set_kbd(vc, lnm);
1927 : else
1928 0 : clr_kbd(vc, lnm);
1929 : break;
1930 : }
1931 0 : }
1932 0 : }
1933 :
1934 : /* console_lock is held */
1935 0 : static void setterm_command(struct vc_data *vc)
1936 : {
1937 0 : switch (vc->vc_par[0]) {
1938 0 : case 1: /* set color for underline mode */
1939 0 : if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1940 0 : vc->vc_ulcolor = color_table[vc->vc_par[1]];
1941 0 : if (vc->state.underline)
1942 0 : update_attr(vc);
1943 : }
1944 : break;
1945 0 : case 2: /* set color for half intensity mode */
1946 0 : if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1947 0 : vc->vc_halfcolor = color_table[vc->vc_par[1]];
1948 0 : if (vc->state.intensity == VCI_HALF_BRIGHT)
1949 0 : update_attr(vc);
1950 : }
1951 : break;
1952 0 : case 8: /* store colors as defaults */
1953 0 : vc->vc_def_color = vc->vc_attr;
1954 0 : if (vc->vc_hi_font_mask == 0x100)
1955 0 : vc->vc_def_color >>= 1;
1956 0 : default_attr(vc);
1957 0 : update_attr(vc);
1958 0 : break;
1959 0 : case 9: /* set blanking interval */
1960 0 : blankinterval = min(vc->vc_par[1], 60U) * 60;
1961 0 : poke_blanked_console();
1962 0 : break;
1963 0 : case 10: /* set bell frequency in Hz */
1964 0 : if (vc->vc_npar >= 1)
1965 0 : vc->vc_bell_pitch = vc->vc_par[1];
1966 : else
1967 0 : vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1968 : break;
1969 0 : case 11: /* set bell duration in msec */
1970 0 : if (vc->vc_npar >= 1)
1971 0 : vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1972 0 : msecs_to_jiffies(vc->vc_par[1]) : 0;
1973 : else
1974 0 : vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1975 : break;
1976 0 : case 12: /* bring specified console to the front */
1977 0 : if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1978 0 : set_console(vc->vc_par[1] - 1);
1979 : break;
1980 0 : case 13: /* unblank the screen */
1981 0 : poke_blanked_console();
1982 0 : break;
1983 0 : case 14: /* set vesa powerdown interval */
1984 0 : vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
1985 0 : break;
1986 0 : case 15: /* activate the previous console */
1987 0 : set_console(last_console);
1988 0 : break;
1989 0 : case 16: /* set cursor blink duration in msec */
1990 0 : if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1991 : vc->vc_par[1] <= USHRT_MAX)
1992 0 : vc->vc_cur_blink_ms = vc->vc_par[1];
1993 : else
1994 0 : vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1995 : break;
1996 : }
1997 0 : }
1998 :
1999 : /* console_lock is held */
2000 0 : static void csi_at(struct vc_data *vc, unsigned int nr)
2001 : {
2002 0 : if (nr > vc->vc_cols - vc->state.x)
2003 : nr = vc->vc_cols - vc->state.x;
2004 0 : else if (!nr)
2005 : nr = 1;
2006 0 : insert_char(vc, nr);
2007 0 : }
2008 :
2009 : /* console_lock is held */
2010 0 : static void csi_L(struct vc_data *vc, unsigned int nr)
2011 : {
2012 0 : if (nr > vc->vc_rows - vc->state.y)
2013 : nr = vc->vc_rows - vc->state.y;
2014 0 : else if (!nr)
2015 : nr = 1;
2016 0 : con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
2017 0 : vc->vc_need_wrap = 0;
2018 0 : }
2019 :
2020 : /* console_lock is held */
2021 0 : static void csi_P(struct vc_data *vc, unsigned int nr)
2022 : {
2023 0 : if (nr > vc->vc_cols - vc->state.x)
2024 : nr = vc->vc_cols - vc->state.x;
2025 0 : else if (!nr)
2026 : nr = 1;
2027 0 : delete_char(vc, nr);
2028 0 : }
2029 :
2030 : /* console_lock is held */
2031 0 : static void csi_M(struct vc_data *vc, unsigned int nr)
2032 : {
2033 0 : if (nr > vc->vc_rows - vc->state.y)
2034 : nr = vc->vc_rows - vc->state.y;
2035 0 : else if (!nr)
2036 : nr=1;
2037 0 : con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
2038 0 : vc->vc_need_wrap = 0;
2039 0 : }
2040 :
2041 : /* console_lock is held (except via vc_init->reset_terminal */
2042 6 : static void save_cur(struct vc_data *vc)
2043 : {
2044 0 : memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
2045 0 : }
2046 :
2047 : /* console_lock is held */
2048 0 : static void restore_cur(struct vc_data *vc)
2049 : {
2050 0 : memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2051 :
2052 0 : gotoxy(vc, vc->state.x, vc->state.y);
2053 0 : vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2054 : vc);
2055 0 : update_attr(vc);
2056 0 : vc->vc_need_wrap = 0;
2057 0 : }
2058 :
2059 : enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2060 : EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2061 : ESpalette, ESosc };
2062 :
2063 : /* console_lock is held (except via vc_init()) */
2064 6 : static void reset_terminal(struct vc_data *vc, int do_clear)
2065 : {
2066 6 : unsigned int i;
2067 :
2068 6 : vc->vc_top = 0;
2069 6 : vc->vc_bottom = vc->vc_rows;
2070 6 : vc->vc_state = ESnormal;
2071 6 : vc->vc_priv = EPecma;
2072 6 : vc->vc_translate = set_translate(LAT1_MAP, vc);
2073 6 : vc->state.Gx_charset[0] = LAT1_MAP;
2074 6 : vc->state.Gx_charset[1] = GRAF_MAP;
2075 6 : vc->state.charset = 0;
2076 6 : vc->vc_need_wrap = 0;
2077 6 : vc->vc_report_mouse = 0;
2078 6 : vc->vc_utf = default_utf8;
2079 6 : vc->vc_utf_count = 0;
2080 :
2081 6 : vc->vc_disp_ctrl = 0;
2082 6 : vc->vc_toggle_meta = 0;
2083 :
2084 6 : vc->vc_decscnm = 0;
2085 6 : vc->vc_decom = 0;
2086 6 : vc->vc_decawm = 1;
2087 6 : vc->vc_deccm = global_cursor_default;
2088 6 : vc->vc_decim = 0;
2089 :
2090 6 : vt_reset_keyboard(vc->vc_num);
2091 :
2092 6 : vc->vc_cursor_type = cur_default;
2093 6 : vc->vc_complement_mask = vc->vc_s_complement_mask;
2094 :
2095 6 : default_attr(vc);
2096 6 : update_attr(vc);
2097 :
2098 6 : bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2099 198 : for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2100 192 : set_bit(i, vc->vc_tab_stop);
2101 :
2102 6 : vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2103 6 : vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2104 6 : vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2105 :
2106 6 : gotoxy(vc, 0, 0);
2107 6 : save_cur(vc);
2108 6 : if (do_clear)
2109 6 : csi_J(vc, 2);
2110 6 : }
2111 :
2112 0 : static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
2113 : {
2114 0 : unsigned char *charset = &vc->state.Gx_charset[which];
2115 :
2116 0 : switch (c) {
2117 0 : case '0':
2118 0 : *charset = GRAF_MAP;
2119 0 : break;
2120 0 : case 'B':
2121 0 : *charset = LAT1_MAP;
2122 0 : break;
2123 0 : case 'U':
2124 0 : *charset = IBMPC_MAP;
2125 0 : break;
2126 0 : case 'K':
2127 0 : *charset = USER_MAP;
2128 0 : break;
2129 : }
2130 :
2131 0 : if (vc->state.charset == which)
2132 0 : vc->vc_translate = set_translate(*charset, vc);
2133 0 : }
2134 :
2135 : /* console_lock is held */
2136 35 : static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2137 : {
2138 : /*
2139 : * Control characters can be used in the _middle_
2140 : * of an escape sequence.
2141 : */
2142 35 : if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2143 : return;
2144 35 : switch (c) {
2145 : case 0:
2146 : return;
2147 0 : case 7:
2148 0 : if (vc->vc_state == ESosc)
2149 0 : vc->vc_state = ESnormal;
2150 0 : else if (vc->vc_bell_duration)
2151 0 : kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2152 : return;
2153 0 : case 8:
2154 0 : bs(vc);
2155 0 : return;
2156 0 : case 9:
2157 0 : vc->vc_pos -= (vc->state.x << 1);
2158 :
2159 0 : vc->state.x = find_next_bit(vc->vc_tab_stop,
2160 0 : min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2161 0 : vc->state.x + 1);
2162 0 : if (vc->state.x >= VC_TABSTOPS_COUNT)
2163 0 : vc->state.x = vc->vc_cols - 1;
2164 :
2165 0 : vc->vc_pos += (vc->state.x << 1);
2166 0 : notify_write(vc, '\t');
2167 : return;
2168 3 : case 10: case 11: case 12:
2169 3 : lf(vc);
2170 3 : if (!is_kbd(vc, lnm))
2171 : return;
2172 4 : fallthrough;
2173 : case 13:
2174 4 : cr(vc);
2175 4 : return;
2176 0 : case 14:
2177 0 : vc->state.charset = 1;
2178 0 : vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
2179 0 : vc->vc_disp_ctrl = 1;
2180 0 : return;
2181 0 : case 15:
2182 0 : vc->state.charset = 0;
2183 0 : vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
2184 0 : vc->vc_disp_ctrl = 0;
2185 0 : return;
2186 0 : case 24: case 26:
2187 0 : vc->vc_state = ESnormal;
2188 0 : return;
2189 9 : case 27:
2190 9 : vc->vc_state = ESesc;
2191 9 : return;
2192 : case 127:
2193 35 : del(vc);
2194 : return;
2195 0 : case 128+27:
2196 0 : vc->vc_state = ESsquare;
2197 0 : return;
2198 : }
2199 19 : switch(vc->vc_state) {
2200 9 : case ESesc:
2201 9 : vc->vc_state = ESnormal;
2202 9 : switch (c) {
2203 3 : case '[':
2204 3 : vc->vc_state = ESsquare;
2205 3 : return;
2206 0 : case ']':
2207 0 : vc->vc_state = ESnonstd;
2208 0 : return;
2209 6 : case '%':
2210 6 : vc->vc_state = ESpercent;
2211 6 : return;
2212 0 : case 'E':
2213 0 : cr(vc);
2214 0 : lf(vc);
2215 0 : return;
2216 0 : case 'M':
2217 0 : ri(vc);
2218 0 : return;
2219 0 : case 'D':
2220 0 : lf(vc);
2221 0 : return;
2222 0 : case 'H':
2223 0 : if (vc->state.x < VC_TABSTOPS_COUNT)
2224 0 : set_bit(vc->state.x, vc->vc_tab_stop);
2225 : return;
2226 : case 'Z':
2227 0 : respond_ID(tty);
2228 : return;
2229 : case '7':
2230 0 : save_cur(vc);
2231 : return;
2232 0 : case '8':
2233 0 : restore_cur(vc);
2234 0 : return;
2235 0 : case '(':
2236 0 : vc->vc_state = ESsetG0;
2237 0 : return;
2238 0 : case ')':
2239 0 : vc->vc_state = ESsetG1;
2240 0 : return;
2241 0 : case '#':
2242 0 : vc->vc_state = EShash;
2243 0 : return;
2244 0 : case 'c':
2245 0 : reset_terminal(vc, 1);
2246 0 : return;
2247 0 : case '>': /* Numeric keypad */
2248 0 : clr_kbd(vc, kbdapplic);
2249 0 : return;
2250 0 : case '=': /* Appl. keypad */
2251 0 : set_kbd(vc, kbdapplic);
2252 0 : return;
2253 : }
2254 : return;
2255 0 : case ESnonstd:
2256 0 : if (c=='P') { /* palette escape sequence */
2257 0 : for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2258 0 : vc->vc_par[vc->vc_npar] = 0;
2259 0 : vc->vc_npar = 0;
2260 0 : vc->vc_state = ESpalette;
2261 0 : return;
2262 0 : } else if (c=='R') { /* reset palette */
2263 0 : reset_palette(vc);
2264 0 : vc->vc_state = ESnormal;
2265 0 : } else if (c>='0' && c<='9')
2266 0 : vc->vc_state = ESosc;
2267 : else
2268 0 : vc->vc_state = ESnormal;
2269 : return;
2270 0 : case ESpalette:
2271 0 : if (isxdigit(c)) {
2272 0 : vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2273 0 : if (vc->vc_npar == 7) {
2274 0 : int i = vc->vc_par[0] * 3, j = 1;
2275 0 : vc->vc_palette[i] = 16 * vc->vc_par[j++];
2276 0 : vc->vc_palette[i++] += vc->vc_par[j++];
2277 0 : vc->vc_palette[i] = 16 * vc->vc_par[j++];
2278 0 : vc->vc_palette[i++] += vc->vc_par[j++];
2279 0 : vc->vc_palette[i] = 16 * vc->vc_par[j++];
2280 0 : vc->vc_palette[i] += vc->vc_par[j];
2281 0 : set_palette(vc);
2282 0 : vc->vc_state = ESnormal;
2283 : }
2284 : } else
2285 0 : vc->vc_state = ESnormal;
2286 : return;
2287 3 : case ESsquare:
2288 51 : for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2289 48 : vc->vc_par[vc->vc_npar] = 0;
2290 3 : vc->vc_npar = 0;
2291 3 : vc->vc_state = ESgetpars;
2292 3 : if (c == '[') { /* Function key */
2293 0 : vc->vc_state=ESfunckey;
2294 0 : return;
2295 : }
2296 3 : switch (c) {
2297 0 : case '?':
2298 0 : vc->vc_priv = EPdec;
2299 0 : return;
2300 0 : case '>':
2301 0 : vc->vc_priv = EPgt;
2302 0 : return;
2303 0 : case '=':
2304 0 : vc->vc_priv = EPeq;
2305 0 : return;
2306 0 : case '<':
2307 0 : vc->vc_priv = EPlt;
2308 0 : return;
2309 : }
2310 3 : vc->vc_priv = EPecma;
2311 4 : fallthrough;
2312 4 : case ESgetpars:
2313 4 : if (c == ';' && vc->vc_npar < NPAR - 1) {
2314 0 : vc->vc_npar++;
2315 0 : return;
2316 4 : } else if (c>='0' && c<='9') {
2317 1 : vc->vc_par[vc->vc_npar] *= 10;
2318 1 : vc->vc_par[vc->vc_npar] += c - '0';
2319 1 : return;
2320 : }
2321 3 : if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2322 0 : vc->vc_state = EScsiignore;
2323 0 : return;
2324 : }
2325 3 : vc->vc_state = ESnormal;
2326 3 : switch(c) {
2327 0 : case 'h':
2328 0 : if (vc->vc_priv <= EPdec)
2329 0 : set_mode(vc, 1);
2330 : return;
2331 0 : case 'l':
2332 0 : if (vc->vc_priv <= EPdec)
2333 0 : set_mode(vc, 0);
2334 : return;
2335 0 : case 'c':
2336 0 : if (vc->vc_priv == EPdec) {
2337 0 : if (vc->vc_par[0])
2338 0 : vc->vc_cursor_type =
2339 0 : CUR_MAKE(vc->vc_par[0],
2340 : vc->vc_par[1],
2341 : vc->vc_par[2]);
2342 : else
2343 0 : vc->vc_cursor_type = cur_default;
2344 0 : return;
2345 : }
2346 : break;
2347 0 : case 'm':
2348 0 : if (vc->vc_priv == EPdec) {
2349 0 : clear_selection();
2350 0 : if (vc->vc_par[0])
2351 0 : vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2352 : else
2353 0 : vc->vc_complement_mask = vc->vc_s_complement_mask;
2354 0 : return;
2355 : }
2356 : break;
2357 0 : case 'n':
2358 0 : if (vc->vc_priv == EPecma) {
2359 0 : if (vc->vc_par[0] == 5)
2360 0 : status_report(tty);
2361 0 : else if (vc->vc_par[0] == 6)
2362 0 : cursor_report(vc, tty);
2363 : }
2364 : return;
2365 : }
2366 3 : if (vc->vc_priv != EPecma) {
2367 0 : vc->vc_priv = EPecma;
2368 0 : return;
2369 : }
2370 3 : switch(c) {
2371 0 : case 'G': case '`':
2372 0 : if (vc->vc_par[0])
2373 0 : vc->vc_par[0]--;
2374 0 : gotoxy(vc, vc->vc_par[0], vc->state.y);
2375 0 : return;
2376 0 : case 'A':
2377 0 : if (!vc->vc_par[0])
2378 0 : vc->vc_par[0]++;
2379 0 : gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
2380 0 : return;
2381 0 : case 'B': case 'e':
2382 0 : if (!vc->vc_par[0])
2383 0 : vc->vc_par[0]++;
2384 0 : gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
2385 0 : return;
2386 0 : case 'C': case 'a':
2387 0 : if (!vc->vc_par[0])
2388 0 : vc->vc_par[0]++;
2389 0 : gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
2390 0 : return;
2391 0 : case 'D':
2392 0 : if (!vc->vc_par[0])
2393 0 : vc->vc_par[0]++;
2394 0 : gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
2395 0 : return;
2396 0 : case 'E':
2397 0 : if (!vc->vc_par[0])
2398 0 : vc->vc_par[0]++;
2399 0 : gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
2400 0 : return;
2401 0 : case 'F':
2402 0 : if (!vc->vc_par[0])
2403 0 : vc->vc_par[0]++;
2404 0 : gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
2405 0 : return;
2406 0 : case 'd':
2407 0 : if (vc->vc_par[0])
2408 0 : vc->vc_par[0]--;
2409 0 : gotoxay(vc, vc->state.x ,vc->vc_par[0]);
2410 0 : return;
2411 1 : case 'H': case 'f':
2412 1 : if (vc->vc_par[0])
2413 0 : vc->vc_par[0]--;
2414 1 : if (vc->vc_par[1])
2415 0 : vc->vc_par[1]--;
2416 1 : gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2417 1 : return;
2418 1 : case 'J':
2419 1 : csi_J(vc, vc->vc_par[0]);
2420 1 : return;
2421 0 : case 'K':
2422 0 : csi_K(vc, vc->vc_par[0]);
2423 0 : return;
2424 0 : case 'L':
2425 0 : csi_L(vc, vc->vc_par[0]);
2426 0 : return;
2427 0 : case 'M':
2428 0 : csi_M(vc, vc->vc_par[0]);
2429 0 : return;
2430 0 : case 'P':
2431 0 : csi_P(vc, vc->vc_par[0]);
2432 0 : return;
2433 0 : case 'c':
2434 0 : if (!vc->vc_par[0])
2435 0 : respond_ID(tty);
2436 : return;
2437 0 : case 'g':
2438 0 : if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2439 0 : set_bit(vc->state.x, vc->vc_tab_stop);
2440 0 : else if (vc->vc_par[0] == 3)
2441 0 : bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2442 : return;
2443 0 : case 'm':
2444 0 : csi_m(vc);
2445 0 : return;
2446 0 : case 'q': /* DECLL - but only 3 leds */
2447 : /* map 0,1,2,3 to 0,1,2,4 */
2448 0 : if (vc->vc_par[0] < 4)
2449 0 : vt_set_led_state(vc->vc_num,
2450 : (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2451 : return;
2452 1 : case 'r':
2453 1 : if (!vc->vc_par[0])
2454 1 : vc->vc_par[0]++;
2455 1 : if (!vc->vc_par[1])
2456 1 : vc->vc_par[1] = vc->vc_rows;
2457 : /* Minimum allowed region is 2 lines */
2458 1 : if (vc->vc_par[0] < vc->vc_par[1] &&
2459 1 : vc->vc_par[1] <= vc->vc_rows) {
2460 1 : vc->vc_top = vc->vc_par[0] - 1;
2461 1 : vc->vc_bottom = vc->vc_par[1];
2462 1 : gotoxay(vc, 0, 0);
2463 : }
2464 : return;
2465 : case 's':
2466 0 : save_cur(vc);
2467 : return;
2468 0 : case 'u':
2469 0 : restore_cur(vc);
2470 0 : return;
2471 0 : case 'X':
2472 0 : csi_X(vc, vc->vc_par[0]);
2473 0 : return;
2474 0 : case '@':
2475 0 : csi_at(vc, vc->vc_par[0]);
2476 0 : return;
2477 0 : case ']': /* setterm functions */
2478 0 : setterm_command(vc);
2479 0 : return;
2480 : }
2481 : return;
2482 0 : case EScsiignore:
2483 0 : if (c >= 20 && c <= 0x3f)
2484 : return;
2485 0 : vc->vc_state = ESnormal;
2486 0 : return;
2487 6 : case ESpercent:
2488 6 : vc->vc_state = ESnormal;
2489 6 : switch (c) {
2490 0 : case '@': /* defined in ISO 2022 */
2491 0 : vc->vc_utf = 0;
2492 0 : return;
2493 6 : case 'G': /* prelim official escape code */
2494 : case '8': /* retained for compatibility */
2495 6 : vc->vc_utf = 1;
2496 6 : return;
2497 : }
2498 : return;
2499 0 : case ESfunckey:
2500 0 : vc->vc_state = ESnormal;
2501 0 : return;
2502 0 : case EShash:
2503 0 : vc->vc_state = ESnormal;
2504 0 : if (c == '8') {
2505 : /* DEC screen alignment test. kludge :-) */
2506 0 : vc->vc_video_erase_char =
2507 0 : (vc->vc_video_erase_char & 0xff00) | 'E';
2508 0 : csi_J(vc, 2);
2509 0 : vc->vc_video_erase_char =
2510 0 : (vc->vc_video_erase_char & 0xff00) | ' ';
2511 0 : do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2512 : }
2513 : return;
2514 0 : case ESsetG0:
2515 0 : vc_setGx(vc, 0, c);
2516 0 : vc->vc_state = ESnormal;
2517 0 : return;
2518 0 : case ESsetG1:
2519 0 : vc_setGx(vc, 1, c);
2520 0 : vc->vc_state = ESnormal;
2521 0 : return;
2522 : case ESosc:
2523 : return;
2524 0 : default:
2525 0 : vc->vc_state = ESnormal;
2526 : }
2527 : }
2528 :
2529 : /* is_double_width() is based on the wcwidth() implementation by
2530 : * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2531 : * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2532 : */
2533 : struct interval {
2534 : uint32_t first;
2535 : uint32_t last;
2536 : };
2537 :
2538 0 : static int ucs_cmp(const void *key, const void *elt)
2539 : {
2540 0 : uint32_t ucs = *(uint32_t *)key;
2541 0 : struct interval e = *(struct interval *) elt;
2542 :
2543 0 : if (ucs > e.last)
2544 : return 1;
2545 0 : else if (ucs < e.first)
2546 0 : return -1;
2547 : return 0;
2548 : }
2549 :
2550 47 : static int is_double_width(uint32_t ucs)
2551 : {
2552 47 : static const struct interval double_width[] = {
2553 : { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2554 : { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2555 : { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2556 : { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2557 : };
2558 47 : if (ucs < double_width[0].first ||
2559 : ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2560 : return 0;
2561 :
2562 0 : return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2563 0 : sizeof(struct interval), ucs_cmp) != NULL;
2564 : }
2565 :
2566 : struct vc_draw_region {
2567 : unsigned long from, to;
2568 : int x;
2569 : };
2570 :
2571 51 : static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2572 : {
2573 51 : if (draw->x < 0)
2574 : return;
2575 :
2576 4 : vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2577 4 : (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2578 : draw->x);
2579 4 : draw->x = -1;
2580 : }
2581 :
2582 0 : static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2583 : {
2584 0 : if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2585 0 : if (vc->vc_toggle_meta)
2586 0 : c |= 0x80;
2587 :
2588 0 : return vc->vc_translate[c];
2589 : }
2590 :
2591 : return c;
2592 : }
2593 :
2594 :
2595 : /**
2596 : * vc_sanitize_unicode -- Replace invalid Unicode code points with U+FFFD
2597 : * @c: the received character, or U+FFFD for invalid sequences.
2598 : */
2599 0 : static inline int vc_sanitize_unicode(const int c)
2600 : {
2601 0 : if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2602 0 : return 0xfffd;
2603 :
2604 : return c;
2605 : }
2606 :
2607 : /**
2608 : * vc_translate_unicode -- Combine UTF-8 into Unicode in @vc_utf_char
2609 : * @vc: virtual console
2610 : * @c: character to translate
2611 : * @rescan: we return true if we need more (continuation) data
2612 : *
2613 : * @vc_utf_char is the being-constructed unicode character.
2614 : * @vc_utf_count is the number of continuation bytes still expected to arrive.
2615 : * @vc_npar is the number of continuation bytes arrived so far.
2616 : */
2617 63 : static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2618 : {
2619 63 : static const u32 utf8_length_changes[] = {
2620 : 0x0000007f, 0x000007ff, 0x0000ffff,
2621 : 0x001fffff, 0x03ffffff, 0x7fffffff
2622 : };
2623 :
2624 : /* Continuation byte received */
2625 63 : if ((c & 0xc0) == 0x80) {
2626 : /* Unexpected continuation byte? */
2627 0 : if (!vc->vc_utf_count)
2628 : return 0xfffd;
2629 :
2630 0 : vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2631 0 : vc->vc_npar++;
2632 0 : if (--vc->vc_utf_count)
2633 0 : goto need_more_bytes;
2634 :
2635 : /* Got a whole character */
2636 0 : c = vc->vc_utf_char;
2637 : /* Reject overlong sequences */
2638 0 : if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2639 0 : c > utf8_length_changes[vc->vc_npar])
2640 : return 0xfffd;
2641 :
2642 0 : return vc_sanitize_unicode(c);
2643 : }
2644 :
2645 : /* Single ASCII byte or first byte of a sequence received */
2646 63 : if (vc->vc_utf_count) {
2647 : /* Continuation byte expected */
2648 0 : *rescan = true;
2649 0 : vc->vc_utf_count = 0;
2650 0 : return 0xfffd;
2651 : }
2652 :
2653 : /* Nothing to do if an ASCII byte was received */
2654 63 : if (c <= 0x7f)
2655 : return c;
2656 :
2657 : /* First byte of a multibyte sequence received */
2658 0 : vc->vc_npar = 0;
2659 0 : if ((c & 0xe0) == 0xc0) {
2660 0 : vc->vc_utf_count = 1;
2661 0 : vc->vc_utf_char = (c & 0x1f);
2662 0 : } else if ((c & 0xf0) == 0xe0) {
2663 0 : vc->vc_utf_count = 2;
2664 0 : vc->vc_utf_char = (c & 0x0f);
2665 0 : } else if ((c & 0xf8) == 0xf0) {
2666 0 : vc->vc_utf_count = 3;
2667 0 : vc->vc_utf_char = (c & 0x07);
2668 0 : } else if ((c & 0xfc) == 0xf8) {
2669 0 : vc->vc_utf_count = 4;
2670 0 : vc->vc_utf_char = (c & 0x03);
2671 0 : } else if ((c & 0xfe) == 0xfc) {
2672 0 : vc->vc_utf_count = 5;
2673 0 : vc->vc_utf_char = (c & 0x01);
2674 : } else {
2675 : /* 254 and 255 are invalid */
2676 : return 0xfffd;
2677 : }
2678 :
2679 : need_more_bytes:
2680 : return -1;
2681 : }
2682 :
2683 82 : static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2684 : {
2685 : /* Do no translation at all in control states */
2686 82 : if (vc->vc_state != ESnormal)
2687 19 : return *c;
2688 :
2689 63 : if (vc->vc_utf && !vc->vc_disp_ctrl)
2690 63 : return *c = vc_translate_unicode(vc, *c, rescan);
2691 :
2692 : /* no utf or alternate charset mode */
2693 0 : return vc_translate_ascii(vc, *c);
2694 : }
2695 :
2696 0 : static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2697 : {
2698 0 : if (!vc->vc_can_do_color)
2699 0 : return vc->vc_attr ^ 0x08;
2700 :
2701 0 : if (vc->vc_hi_font_mask == 0x100)
2702 0 : return (vc->vc_attr & 0x11) |
2703 0 : ((vc->vc_attr & 0xe0) >> 4) |
2704 0 : ((vc->vc_attr & 0x0e) << 4);
2705 :
2706 0 : return (vc->vc_attr & 0x88) |
2707 0 : ((vc->vc_attr & 0x70) >> 4) |
2708 0 : ((vc->vc_attr & 0x07) << 4);
2709 : }
2710 :
2711 82 : static bool vc_is_control(struct vc_data *vc, int tc, int c)
2712 : {
2713 : /*
2714 : * A bitmap for codes <32. A bit of 1 indicates that the code
2715 : * corresponding to that bit number invokes some special action (such
2716 : * as cursor movement) and should not be displayed as a glyph unless
2717 : * the disp_ctrl mode is explicitly enabled.
2718 : */
2719 82 : static const u32 CTRL_ACTION = 0x0d00ff81;
2720 : /* Cannot be overridden by disp_ctrl */
2721 82 : static const u32 CTRL_ALWAYS = 0x0800f501;
2722 :
2723 82 : if (vc->vc_state != ESnormal)
2724 : return true;
2725 :
2726 63 : if (!tc)
2727 : return true;
2728 :
2729 : /*
2730 : * If the original code was a control character we only allow a glyph
2731 : * to be displayed if the code is not normally used (such as for cursor
2732 : * movement) or if the disp_ctrl mode has been explicitly enabled.
2733 : * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2734 : * displayed as control characters, as the console would be pretty
2735 : * useless without them; to display an arbitrary font position use the
2736 : * direct-to-font zone in UTF-8 mode.
2737 : */
2738 63 : if (c < 32) {
2739 16 : if (vc->vc_disp_ctrl)
2740 0 : return CTRL_ALWAYS & BIT(c);
2741 : else
2742 16 : return vc->vc_utf || (CTRL_ACTION & BIT(c));
2743 : }
2744 :
2745 47 : if (c == 127 && !vc->vc_disp_ctrl)
2746 : return true;
2747 :
2748 47 : if (c == 128 + 27)
2749 0 : return true;
2750 :
2751 : return false;
2752 : }
2753 :
2754 47 : static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2755 : struct vc_draw_region *draw)
2756 : {
2757 47 : int next_c;
2758 47 : unsigned char vc_attr = vc->vc_attr;
2759 47 : u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2760 47 : u8 width = 1;
2761 47 : bool inverse = false;
2762 :
2763 47 : if (vc->vc_utf && !vc->vc_disp_ctrl) {
2764 47 : if (is_double_width(c))
2765 0 : width = 2;
2766 : }
2767 :
2768 : /* Now try to find out how to display it */
2769 47 : tc = conv_uni_to_pc(vc, tc);
2770 47 : if (tc & ~charmask) {
2771 0 : if (tc == -1 || tc == -2)
2772 : return -1; /* nothing to display */
2773 :
2774 : /* Glyph not found */
2775 0 : if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
2776 0 : !(c & ~charmask)) {
2777 : /*
2778 : * In legacy mode use the glyph we get by a 1:1
2779 : * mapping.
2780 : * This would make absolutely no sense with Unicode in
2781 : * mind, but do this for ASCII characters since a font
2782 : * may lack Unicode mapping info and we don't want to
2783 : * end up with having question marks only.
2784 : */
2785 : tc = c;
2786 : } else {
2787 : /*
2788 : * Display U+FFFD. If it's not found, display an inverse
2789 : * question mark.
2790 : */
2791 0 : tc = conv_uni_to_pc(vc, 0xfffd);
2792 0 : if (tc < 0) {
2793 0 : inverse = true;
2794 0 : tc = conv_uni_to_pc(vc, '?');
2795 0 : if (tc < 0)
2796 0 : tc = '?';
2797 :
2798 0 : vc_attr = vc_invert_attr(vc);
2799 0 : con_flush(vc, draw);
2800 : }
2801 : }
2802 : }
2803 :
2804 47 : next_c = c;
2805 47 : while (1) {
2806 47 : if (vc->vc_need_wrap || vc->vc_decim)
2807 0 : con_flush(vc, draw);
2808 47 : if (vc->vc_need_wrap) {
2809 0 : cr(vc);
2810 0 : lf(vc);
2811 : }
2812 47 : if (vc->vc_decim)
2813 0 : insert_char(vc, 1);
2814 47 : vc_uniscr_putc(vc, next_c);
2815 :
2816 47 : if (himask)
2817 0 : tc = ((tc & 0x100) ? himask : 0) |
2818 0 : (tc & 0xff);
2819 47 : tc |= (vc_attr << 8) & ~himask;
2820 :
2821 47 : scr_writew(tc, (u16 *)vc->vc_pos);
2822 :
2823 47 : if (con_should_update(vc) && draw->x < 0) {
2824 4 : draw->x = vc->state.x;
2825 4 : draw->from = vc->vc_pos;
2826 : }
2827 47 : if (vc->state.x == vc->vc_cols - 1) {
2828 0 : vc->vc_need_wrap = vc->vc_decawm;
2829 0 : draw->to = vc->vc_pos + 2;
2830 : } else {
2831 47 : vc->state.x++;
2832 47 : draw->to = (vc->vc_pos += 2);
2833 : }
2834 :
2835 47 : if (!--width)
2836 : break;
2837 :
2838 : /* A space is printed in the second column */
2839 0 : tc = conv_uni_to_pc(vc, ' ');
2840 0 : if (tc < 0)
2841 0 : tc = ' ';
2842 : next_c = ' ';
2843 : }
2844 47 : notify_write(vc, c);
2845 :
2846 47 : if (inverse)
2847 0 : con_flush(vc, draw);
2848 :
2849 : return 0;
2850 : }
2851 :
2852 : /* acquires console_lock */
2853 16 : static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2854 : {
2855 16 : struct vc_draw_region draw = {
2856 : .x = -1,
2857 : };
2858 16 : int c, tc, n = 0;
2859 16 : unsigned int currcons;
2860 16 : struct vc_data *vc;
2861 16 : struct vt_notifier_param param;
2862 16 : bool rescan;
2863 :
2864 16 : if (in_interrupt())
2865 : return count;
2866 :
2867 16 : console_lock();
2868 16 : vc = tty->driver_data;
2869 16 : if (vc == NULL) {
2870 0 : pr_err("vt: argh, driver_data is NULL !\n");
2871 0 : console_unlock();
2872 0 : return 0;
2873 : }
2874 :
2875 16 : currcons = vc->vc_num;
2876 16 : if (!vc_cons_allocated(currcons)) {
2877 : /* could this happen? */
2878 0 : pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2879 0 : console_unlock();
2880 0 : return 0;
2881 : }
2882 :
2883 :
2884 : /* undraw cursor first */
2885 16 : if (con_is_fg(vc))
2886 11 : hide_cursor(vc);
2887 :
2888 16 : param.vc = vc;
2889 :
2890 98 : while (!tty->stopped && count) {
2891 82 : int orig = *buf;
2892 82 : buf++;
2893 82 : n++;
2894 82 : count--;
2895 82 : rescan_last_byte:
2896 82 : c = orig;
2897 82 : rescan = false;
2898 :
2899 82 : tc = vc_translate(vc, &c, &rescan);
2900 82 : if (tc == -1)
2901 0 : continue;
2902 :
2903 82 : param.c = tc;
2904 82 : if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2905 : ¶m) == NOTIFY_STOP)
2906 0 : continue;
2907 :
2908 82 : if (vc_is_control(vc, tc, c)) {
2909 35 : con_flush(vc, &draw);
2910 35 : do_con_trol(tty, vc, orig);
2911 35 : continue;
2912 : }
2913 :
2914 47 : if (vc_con_write_normal(vc, tc, c, &draw) < 0)
2915 0 : continue;
2916 :
2917 47 : if (rescan)
2918 0 : goto rescan_last_byte;
2919 : }
2920 16 : con_flush(vc, &draw);
2921 16 : vc_uniscr_debug_check(vc);
2922 16 : console_conditional_schedule();
2923 16 : notify_update(vc);
2924 16 : console_unlock();
2925 16 : return n;
2926 : }
2927 :
2928 : /*
2929 : * This is the console switching callback.
2930 : *
2931 : * Doing console switching in a process context allows
2932 : * us to do the switches asynchronously (needed when we want
2933 : * to switch due to a keyboard interrupt). Synchronization
2934 : * with other console code and prevention of re-entrancy is
2935 : * ensured with console_lock.
2936 : */
2937 0 : static void console_callback(struct work_struct *ignored)
2938 : {
2939 0 : console_lock();
2940 :
2941 0 : if (want_console >= 0) {
2942 0 : if (want_console != fg_console &&
2943 0 : vc_cons_allocated(want_console)) {
2944 0 : hide_cursor(vc_cons[fg_console].d);
2945 0 : change_console(vc_cons[want_console].d);
2946 : /* we only changed when the console had already
2947 : been allocated - a new console is not created
2948 : in an interrupt routine */
2949 : }
2950 0 : want_console = -1;
2951 : }
2952 0 : if (do_poke_blanked_console) { /* do not unblank for a LED change */
2953 0 : do_poke_blanked_console = 0;
2954 0 : poke_blanked_console();
2955 : }
2956 0 : if (scrollback_delta) {
2957 0 : struct vc_data *vc = vc_cons[fg_console].d;
2958 0 : clear_selection();
2959 0 : if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2960 0 : vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2961 0 : scrollback_delta = 0;
2962 : }
2963 0 : if (blank_timer_expired) {
2964 0 : do_blank_screen(0);
2965 0 : blank_timer_expired = 0;
2966 : }
2967 0 : notify_update(vc_cons[fg_console].d);
2968 :
2969 0 : console_unlock();
2970 0 : }
2971 :
2972 0 : int set_console(int nr)
2973 : {
2974 0 : struct vc_data *vc = vc_cons[fg_console].d;
2975 :
2976 0 : if (!vc_cons_allocated(nr) || vt_dont_switch ||
2977 0 : (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2978 :
2979 : /*
2980 : * Console switch will fail in console_callback() or
2981 : * change_console() so there is no point scheduling
2982 : * the callback
2983 : *
2984 : * Existing set_console() users don't check the return
2985 : * value so this shouldn't break anything
2986 : */
2987 : return -EINVAL;
2988 : }
2989 :
2990 0 : want_console = nr;
2991 0 : schedule_console_callback();
2992 :
2993 0 : return 0;
2994 : }
2995 :
2996 : struct tty_driver *console_driver;
2997 :
2998 : #ifdef CONFIG_VT_CONSOLE
2999 :
3000 : /**
3001 : * vt_kmsg_redirect() - Sets/gets the kernel message console
3002 : * @new: The new virtual terminal number or -1 if the console should stay
3003 : * unchanged
3004 : *
3005 : * By default, the kernel messages are always printed on the current virtual
3006 : * console. However, the user may modify that default with the
3007 : * TIOCL_SETKMSGREDIRECT ioctl call.
3008 : *
3009 : * This function sets the kernel message console to be @new. It returns the old
3010 : * virtual console number. The virtual terminal number 0 (both as parameter and
3011 : * return value) means no redirection (i.e. always printed on the currently
3012 : * active console).
3013 : *
3014 : * The parameter -1 means that only the current console is returned, but the
3015 : * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3016 : * case to make the code more understandable.
3017 : *
3018 : * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
3019 : * the parameter and always returns 0.
3020 : */
3021 0 : int vt_kmsg_redirect(int new)
3022 : {
3023 0 : static int kmsg_con;
3024 :
3025 0 : if (new != -1)
3026 0 : return xchg(&kmsg_con, new);
3027 : else
3028 0 : return kmsg_con;
3029 : }
3030 :
3031 : /*
3032 : * Console on virtual terminal
3033 : *
3034 : * The console must be locked when we get here.
3035 : */
3036 :
3037 0 : static void vt_console_print(struct console *co, const char *b, unsigned count)
3038 : {
3039 0 : struct vc_data *vc = vc_cons[fg_console].d;
3040 0 : unsigned char c;
3041 0 : static DEFINE_SPINLOCK(printing_lock);
3042 0 : const ushort *start;
3043 0 : ushort start_x, cnt;
3044 0 : int kmsg_console;
3045 :
3046 : /* console busy or not yet initialized */
3047 0 : if (!printable)
3048 : return;
3049 0 : if (!spin_trylock(&printing_lock))
3050 : return;
3051 :
3052 0 : kmsg_console = vt_get_kmsg_redirect();
3053 0 : if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3054 0 : vc = vc_cons[kmsg_console - 1].d;
3055 :
3056 0 : if (!vc_cons_allocated(fg_console)) {
3057 : /* impossible */
3058 : /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3059 0 : goto quit;
3060 : }
3061 :
3062 0 : if (vc->vc_mode != KD_TEXT)
3063 0 : goto quit;
3064 :
3065 : /* undraw cursor first */
3066 0 : if (con_is_fg(vc))
3067 0 : hide_cursor(vc);
3068 :
3069 0 : start = (ushort *)vc->vc_pos;
3070 0 : start_x = vc->state.x;
3071 0 : cnt = 0;
3072 0 : while (count--) {
3073 0 : c = *b++;
3074 0 : if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
3075 0 : if (cnt && con_is_visible(vc))
3076 0 : vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3077 0 : cnt = 0;
3078 0 : if (c == 8) { /* backspace */
3079 0 : bs(vc);
3080 0 : start = (ushort *)vc->vc_pos;
3081 0 : start_x = vc->state.x;
3082 0 : continue;
3083 : }
3084 0 : if (c != 13)
3085 0 : lf(vc);
3086 0 : cr(vc);
3087 0 : start = (ushort *)vc->vc_pos;
3088 0 : start_x = vc->state.x;
3089 0 : if (c == 10 || c == 13)
3090 0 : continue;
3091 : }
3092 0 : vc_uniscr_putc(vc, c);
3093 0 : scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3094 0 : notify_write(vc, c);
3095 0 : cnt++;
3096 0 : if (vc->state.x == vc->vc_cols - 1) {
3097 0 : vc->vc_need_wrap = 1;
3098 : } else {
3099 0 : vc->vc_pos += 2;
3100 0 : vc->state.x++;
3101 : }
3102 : }
3103 0 : if (cnt && con_is_visible(vc))
3104 0 : vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3105 0 : set_cursor(vc);
3106 0 : notify_update(vc);
3107 :
3108 0 : quit:
3109 0 : spin_unlock(&printing_lock);
3110 : }
3111 :
3112 0 : static struct tty_driver *vt_console_device(struct console *c, int *index)
3113 : {
3114 0 : *index = c->index ? c->index-1 : fg_console;
3115 0 : return console_driver;
3116 : }
3117 :
3118 : static struct console vt_console_driver = {
3119 : .name = "tty",
3120 : .write = vt_console_print,
3121 : .device = vt_console_device,
3122 : .unblank = unblank_screen,
3123 : .flags = CON_PRINTBUFFER,
3124 : .index = -1,
3125 : };
3126 : #endif
3127 :
3128 : /*
3129 : * Handling of Linux-specific VC ioctls
3130 : */
3131 :
3132 : /*
3133 : * Generally a bit racy with respect to console_lock();.
3134 : *
3135 : * There are some functions which don't need it.
3136 : *
3137 : * There are some functions which can sleep for arbitrary periods
3138 : * (paste_selection) but we don't need the lock there anyway.
3139 : *
3140 : * set_selection_user has locking, and definitely needs it
3141 : */
3142 :
3143 0 : int tioclinux(struct tty_struct *tty, unsigned long arg)
3144 : {
3145 0 : char type, data;
3146 0 : char __user *p = (char __user *)arg;
3147 0 : int lines;
3148 0 : int ret;
3149 :
3150 0 : if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3151 : return -EPERM;
3152 0 : if (get_user(type, p))
3153 : return -EFAULT;
3154 0 : ret = 0;
3155 :
3156 0 : switch (type)
3157 : {
3158 0 : case TIOCL_SETSEL:
3159 0 : ret = set_selection_user((struct tiocl_selection
3160 0 : __user *)(p+1), tty);
3161 0 : break;
3162 0 : case TIOCL_PASTESEL:
3163 0 : ret = paste_selection(tty);
3164 0 : break;
3165 0 : case TIOCL_UNBLANKSCREEN:
3166 0 : console_lock();
3167 0 : unblank_screen();
3168 0 : console_unlock();
3169 0 : break;
3170 0 : case TIOCL_SELLOADLUT:
3171 0 : console_lock();
3172 0 : ret = sel_loadlut(p);
3173 0 : console_unlock();
3174 0 : break;
3175 0 : case TIOCL_GETSHIFTSTATE:
3176 :
3177 : /*
3178 : * Make it possible to react to Shift+Mousebutton.
3179 : * Note that 'shift_state' is an undocumented
3180 : * kernel-internal variable; programs not closely
3181 : * related to the kernel should not use this.
3182 : */
3183 0 : data = vt_get_shift_state();
3184 0 : ret = put_user(data, p);
3185 0 : break;
3186 0 : case TIOCL_GETMOUSEREPORTING:
3187 0 : console_lock(); /* May be overkill */
3188 0 : data = mouse_reporting();
3189 0 : console_unlock();
3190 0 : ret = put_user(data, p);
3191 0 : break;
3192 0 : case TIOCL_SETVESABLANK:
3193 0 : console_lock();
3194 0 : ret = set_vesa_blanking(p);
3195 0 : console_unlock();
3196 0 : break;
3197 : case TIOCL_GETKMSGREDIRECT:
3198 0 : data = vt_get_kmsg_redirect();
3199 0 : ret = put_user(data, p);
3200 0 : break;
3201 0 : case TIOCL_SETKMSGREDIRECT:
3202 0 : if (!capable(CAP_SYS_ADMIN)) {
3203 : ret = -EPERM;
3204 : } else {
3205 0 : if (get_user(data, p+1))
3206 : ret = -EFAULT;
3207 : else
3208 0 : vt_kmsg_redirect(data);
3209 : }
3210 : break;
3211 0 : case TIOCL_GETFGCONSOLE:
3212 : /* No locking needed as this is a transiently
3213 : correct return anyway if the caller hasn't
3214 : disabled switching */
3215 0 : ret = fg_console;
3216 0 : break;
3217 0 : case TIOCL_SCROLLCONSOLE:
3218 0 : if (get_user(lines, (s32 __user *)(p+4))) {
3219 : ret = -EFAULT;
3220 : } else {
3221 : /* Need the console lock here. Note that lots
3222 : of other calls need fixing before the lock
3223 : is actually useful ! */
3224 0 : console_lock();
3225 0 : scrollfront(vc_cons[fg_console].d, lines);
3226 0 : console_unlock();
3227 0 : ret = 0;
3228 : }
3229 : break;
3230 0 : case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3231 0 : console_lock();
3232 0 : ignore_poke = 1;
3233 0 : do_blank_screen(0);
3234 0 : console_unlock();
3235 0 : break;
3236 0 : case TIOCL_BLANKEDSCREEN:
3237 0 : ret = console_blanked;
3238 0 : break;
3239 : default:
3240 : ret = -EINVAL;
3241 : break;
3242 : }
3243 : return ret;
3244 : }
3245 :
3246 : /*
3247 : * /dev/ttyN handling
3248 : */
3249 :
3250 16 : static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3251 : {
3252 16 : int retval;
3253 :
3254 16 : retval = do_con_write(tty, buf, count);
3255 16 : con_flush_chars(tty);
3256 :
3257 16 : return retval;
3258 : }
3259 :
3260 0 : static int con_put_char(struct tty_struct *tty, unsigned char ch)
3261 : {
3262 0 : if (in_interrupt())
3263 : return 0; /* n_r3964 calls put_char() from interrupt context */
3264 0 : return do_con_write(tty, &ch, 1);
3265 : }
3266 :
3267 17 : static int con_write_room(struct tty_struct *tty)
3268 : {
3269 17 : if (tty->stopped)
3270 0 : return 0;
3271 : return 32768; /* No limit, really; we're not buffering */
3272 : }
3273 :
3274 2 : static int con_chars_in_buffer(struct tty_struct *tty)
3275 : {
3276 2 : return 0; /* we're not buffering */
3277 : }
3278 :
3279 : /*
3280 : * con_throttle and con_unthrottle are only used for
3281 : * paste_selection(), which has to stuff in a large number of
3282 : * characters...
3283 : */
3284 0 : static void con_throttle(struct tty_struct *tty)
3285 : {
3286 0 : }
3287 :
3288 0 : static void con_unthrottle(struct tty_struct *tty)
3289 : {
3290 0 : struct vc_data *vc = tty->driver_data;
3291 :
3292 0 : wake_up_interruptible(&vc->paste_wait);
3293 0 : }
3294 :
3295 : /*
3296 : * Turn the Scroll-Lock LED on when the tty is stopped
3297 : */
3298 0 : static void con_stop(struct tty_struct *tty)
3299 : {
3300 0 : int console_num;
3301 0 : if (!tty)
3302 : return;
3303 0 : console_num = tty->index;
3304 0 : if (!vc_cons_allocated(console_num))
3305 : return;
3306 0 : vt_kbd_con_stop(console_num);
3307 : }
3308 :
3309 : /*
3310 : * Turn the Scroll-Lock LED off when the console is started
3311 : */
3312 0 : static void con_start(struct tty_struct *tty)
3313 : {
3314 0 : int console_num;
3315 0 : if (!tty)
3316 : return;
3317 0 : console_num = tty->index;
3318 0 : if (!vc_cons_allocated(console_num))
3319 : return;
3320 0 : vt_kbd_con_start(console_num);
3321 : }
3322 :
3323 28 : static void con_flush_chars(struct tty_struct *tty)
3324 : {
3325 28 : struct vc_data *vc;
3326 :
3327 28 : if (in_interrupt()) /* from flush_to_ldisc */
3328 : return;
3329 :
3330 : /* if we race with con_close(), vt may be null */
3331 28 : console_lock();
3332 28 : vc = tty->driver_data;
3333 28 : if (vc)
3334 28 : set_cursor(vc);
3335 28 : console_unlock();
3336 : }
3337 :
3338 : /*
3339 : * Allocate the console screen memory.
3340 : */
3341 28 : static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3342 : {
3343 28 : unsigned int currcons = tty->index;
3344 28 : struct vc_data *vc;
3345 28 : int ret;
3346 :
3347 28 : console_lock();
3348 28 : ret = vc_allocate(currcons);
3349 28 : if (ret)
3350 0 : goto unlock;
3351 :
3352 28 : vc = vc_cons[currcons].d;
3353 :
3354 : /* Still being freed */
3355 28 : if (vc->port.tty) {
3356 0 : ret = -ERESTARTSYS;
3357 0 : goto unlock;
3358 : }
3359 :
3360 28 : ret = tty_port_install(&vc->port, driver, tty);
3361 28 : if (ret)
3362 0 : goto unlock;
3363 :
3364 28 : tty->driver_data = vc;
3365 28 : vc->port.tty = tty;
3366 28 : tty_port_get(&vc->port);
3367 :
3368 28 : if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3369 28 : tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3370 28 : tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3371 : }
3372 28 : if (vc->vc_utf)
3373 28 : tty->termios.c_iflag |= IUTF8;
3374 : else
3375 0 : tty->termios.c_iflag &= ~IUTF8;
3376 28 : unlock:
3377 28 : console_unlock();
3378 28 : return ret;
3379 : }
3380 :
3381 41 : static int con_open(struct tty_struct *tty, struct file *filp)
3382 : {
3383 : /* everything done in install */
3384 41 : return 0;
3385 : }
3386 :
3387 :
3388 39 : static void con_close(struct tty_struct *tty, struct file *filp)
3389 : {
3390 : /* Nothing to do - we defer to shutdown */
3391 39 : }
3392 :
3393 26 : static void con_shutdown(struct tty_struct *tty)
3394 : {
3395 26 : struct vc_data *vc = tty->driver_data;
3396 26 : BUG_ON(vc == NULL);
3397 26 : console_lock();
3398 26 : vc->port.tty = NULL;
3399 26 : console_unlock();
3400 26 : }
3401 :
3402 26 : static void con_cleanup(struct tty_struct *tty)
3403 : {
3404 26 : struct vc_data *vc = tty->driver_data;
3405 :
3406 26 : tty_port_put(&vc->port);
3407 26 : }
3408 :
3409 : static int default_color = 7; /* white */
3410 : static int default_italic_color = 2; // green (ASCII)
3411 : static int default_underline_color = 3; // cyan (ASCII)
3412 : module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3413 : module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3414 : module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3415 :
3416 6 : static void vc_init(struct vc_data *vc, unsigned int rows,
3417 : unsigned int cols, int do_clear)
3418 : {
3419 6 : int j, k ;
3420 :
3421 6 : vc->vc_cols = cols;
3422 6 : vc->vc_rows = rows;
3423 6 : vc->vc_size_row = cols << 1;
3424 6 : vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3425 :
3426 6 : set_origin(vc);
3427 6 : vc->vc_pos = vc->vc_origin;
3428 6 : reset_vc(vc);
3429 108 : for (j=k=0; j<16; j++) {
3430 96 : vc->vc_palette[k++] = default_red[j] ;
3431 96 : vc->vc_palette[k++] = default_grn[j] ;
3432 96 : vc->vc_palette[k++] = default_blu[j] ;
3433 : }
3434 6 : vc->vc_def_color = default_color;
3435 6 : vc->vc_ulcolor = default_underline_color;
3436 6 : vc->vc_itcolor = default_italic_color;
3437 6 : vc->vc_halfcolor = 0x08; /* grey */
3438 6 : init_waitqueue_head(&vc->paste_wait);
3439 6 : reset_terminal(vc, do_clear);
3440 6 : }
3441 :
3442 : /*
3443 : * This routine initializes console interrupts, and does nothing
3444 : * else. If you want the screen to clear, call tty_write with
3445 : * the appropriate escape-sequence.
3446 : */
3447 :
3448 1 : static int __init con_init(void)
3449 : {
3450 1 : const char *display_desc = NULL;
3451 1 : struct vc_data *vc;
3452 1 : unsigned int currcons = 0, i;
3453 :
3454 1 : console_lock();
3455 :
3456 1 : if (!conswitchp)
3457 1 : conswitchp = &dummy_con;
3458 1 : display_desc = conswitchp->con_startup();
3459 1 : if (!display_desc) {
3460 0 : fg_console = 0;
3461 0 : console_unlock();
3462 0 : return 0;
3463 : }
3464 :
3465 1 : for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3466 1 : struct con_driver *con_driver = ®istered_con_driver[i];
3467 :
3468 1 : if (con_driver->con == NULL) {
3469 1 : con_driver->con = conswitchp;
3470 1 : con_driver->desc = display_desc;
3471 1 : con_driver->flag = CON_DRIVER_FLAG_INIT;
3472 1 : con_driver->first = 0;
3473 1 : con_driver->last = MAX_NR_CONSOLES - 1;
3474 1 : break;
3475 : }
3476 : }
3477 :
3478 64 : for (i = 0; i < MAX_NR_CONSOLES; i++)
3479 63 : con_driver_map[i] = conswitchp;
3480 :
3481 1 : if (blankinterval) {
3482 0 : blank_state = blank_normal_wait;
3483 0 : mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3484 : }
3485 :
3486 2 : for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3487 1 : vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3488 1 : INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3489 1 : tty_port_init(&vc->port);
3490 1 : visual_init(vc, currcons, 1);
3491 : /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3492 1 : vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3493 1 : vc_init(vc, vc->vc_rows, vc->vc_cols,
3494 1 : currcons || !vc->vc_sw->con_save_screen);
3495 : }
3496 1 : currcons = fg_console = 0;
3497 1 : master_display_fg = vc = vc_cons[currcons].d;
3498 1 : set_origin(vc);
3499 1 : save_screen(vc);
3500 1 : gotoxy(vc, vc->state.x, vc->state.y);
3501 1 : csi_J(vc, 0);
3502 1 : update_screen(vc);
3503 1 : pr_info("Console: %s %s %dx%d\n",
3504 : vc->vc_can_do_color ? "colour" : "mono",
3505 : display_desc, vc->vc_cols, vc->vc_rows);
3506 1 : printable = 1;
3507 :
3508 1 : console_unlock();
3509 :
3510 : #ifdef CONFIG_VT_CONSOLE
3511 1 : register_console(&vt_console_driver);
3512 : #endif
3513 1 : return 0;
3514 : }
3515 : console_initcall(con_init);
3516 :
3517 : static const struct tty_operations con_ops = {
3518 : .install = con_install,
3519 : .open = con_open,
3520 : .close = con_close,
3521 : .write = con_write,
3522 : .write_room = con_write_room,
3523 : .put_char = con_put_char,
3524 : .flush_chars = con_flush_chars,
3525 : .chars_in_buffer = con_chars_in_buffer,
3526 : .ioctl = vt_ioctl,
3527 : #ifdef CONFIG_COMPAT
3528 : .compat_ioctl = vt_compat_ioctl,
3529 : #endif
3530 : .stop = con_stop,
3531 : .start = con_start,
3532 : .throttle = con_throttle,
3533 : .unthrottle = con_unthrottle,
3534 : .resize = vt_resize,
3535 : .shutdown = con_shutdown,
3536 : .cleanup = con_cleanup,
3537 : };
3538 :
3539 : static struct cdev vc0_cdev;
3540 :
3541 1 : static ssize_t show_tty_active(struct device *dev,
3542 : struct device_attribute *attr, char *buf)
3543 : {
3544 1 : return sprintf(buf, "tty%d\n", fg_console + 1);
3545 : }
3546 : static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3547 :
3548 : static struct attribute *vt_dev_attrs[] = {
3549 : &dev_attr_active.attr,
3550 : NULL
3551 : };
3552 :
3553 : ATTRIBUTE_GROUPS(vt_dev);
3554 :
3555 1 : int __init vty_init(const struct file_operations *console_fops)
3556 : {
3557 1 : cdev_init(&vc0_cdev, console_fops);
3558 2 : if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3559 1 : register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3560 0 : panic("Couldn't register /dev/tty0 driver\n");
3561 1 : tty0dev = device_create_with_groups(tty_class, NULL,
3562 : MKDEV(TTY_MAJOR, 0), NULL,
3563 : vt_dev_groups, "tty0");
3564 1 : if (IS_ERR(tty0dev))
3565 0 : tty0dev = NULL;
3566 :
3567 1 : vcs_init();
3568 :
3569 1 : console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3570 1 : if (!console_driver)
3571 0 : panic("Couldn't allocate console driver\n");
3572 :
3573 1 : console_driver->name = "tty";
3574 1 : console_driver->name_base = 1;
3575 1 : console_driver->major = TTY_MAJOR;
3576 1 : console_driver->minor_start = 1;
3577 1 : console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3578 1 : console_driver->init_termios = tty_std_termios;
3579 1 : if (default_utf8)
3580 1 : console_driver->init_termios.c_iflag |= IUTF8;
3581 1 : console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3582 1 : tty_set_operations(console_driver, &con_ops);
3583 1 : if (tty_register_driver(console_driver))
3584 0 : panic("Couldn't register console driver\n");
3585 1 : kbd_init();
3586 1 : console_map_init();
3587 : #ifdef CONFIG_MDA_CONSOLE
3588 : mda_console_init();
3589 : #endif
3590 1 : return 0;
3591 : }
3592 :
3593 : #ifndef VT_SINGLE_DRIVER
3594 :
3595 : static struct class *vtconsole_class;
3596 :
3597 0 : static int do_bind_con_driver(const struct consw *csw, int first, int last,
3598 : int deflt)
3599 : {
3600 0 : struct module *owner = csw->owner;
3601 0 : const char *desc = NULL;
3602 0 : struct con_driver *con_driver;
3603 0 : int i, j = -1, k = -1, retval = -ENODEV;
3604 :
3605 0 : if (!try_module_get(owner))
3606 : return -ENODEV;
3607 :
3608 0 : WARN_CONSOLE_UNLOCKED();
3609 :
3610 : /* check if driver is registered */
3611 0 : for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3612 0 : con_driver = ®istered_con_driver[i];
3613 :
3614 0 : if (con_driver->con == csw) {
3615 0 : desc = con_driver->desc;
3616 0 : retval = 0;
3617 0 : break;
3618 : }
3619 : }
3620 :
3621 0 : if (retval)
3622 0 : goto err;
3623 :
3624 0 : if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3625 0 : csw->con_startup();
3626 0 : con_driver->flag |= CON_DRIVER_FLAG_INIT;
3627 : }
3628 :
3629 0 : if (deflt) {
3630 0 : if (conswitchp)
3631 0 : module_put(conswitchp->owner);
3632 :
3633 0 : __module_get(owner);
3634 0 : conswitchp = csw;
3635 : }
3636 :
3637 0 : first = max(first, con_driver->first);
3638 0 : last = min(last, con_driver->last);
3639 :
3640 0 : for (i = first; i <= last; i++) {
3641 0 : int old_was_color;
3642 0 : struct vc_data *vc = vc_cons[i].d;
3643 :
3644 0 : if (con_driver_map[i])
3645 0 : module_put(con_driver_map[i]->owner);
3646 0 : __module_get(owner);
3647 0 : con_driver_map[i] = csw;
3648 :
3649 0 : if (!vc || !vc->vc_sw)
3650 0 : continue;
3651 :
3652 0 : j = i;
3653 :
3654 0 : if (con_is_visible(vc)) {
3655 0 : k = i;
3656 0 : save_screen(vc);
3657 : }
3658 :
3659 0 : old_was_color = vc->vc_can_do_color;
3660 0 : vc->vc_sw->con_deinit(vc);
3661 0 : vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3662 0 : visual_init(vc, i, 0);
3663 0 : set_origin(vc);
3664 0 : update_attr(vc);
3665 :
3666 : /* If the console changed between mono <-> color, then
3667 : * the attributes in the screenbuf will be wrong. The
3668 : * following resets all attributes to something sane.
3669 : */
3670 0 : if (old_was_color != vc->vc_can_do_color)
3671 0 : clear_buffer_attributes(vc);
3672 : }
3673 :
3674 0 : pr_info("Console: switching ");
3675 0 : if (!deflt)
3676 0 : pr_cont("consoles %d-%d ", first + 1, last + 1);
3677 0 : if (j >= 0) {
3678 0 : struct vc_data *vc = vc_cons[j].d;
3679 :
3680 0 : pr_cont("to %s %s %dx%d\n",
3681 : vc->vc_can_do_color ? "colour" : "mono",
3682 : desc, vc->vc_cols, vc->vc_rows);
3683 :
3684 0 : if (k >= 0) {
3685 0 : vc = vc_cons[k].d;
3686 0 : update_screen(vc);
3687 : }
3688 : } else {
3689 0 : pr_cont("to %s\n", desc);
3690 : }
3691 :
3692 : retval = 0;
3693 0 : err:
3694 0 : module_put(owner);
3695 0 : return retval;
3696 : };
3697 :
3698 :
3699 : #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3700 : int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3701 : {
3702 : struct module *owner = csw->owner;
3703 : const struct consw *defcsw = NULL;
3704 : struct con_driver *con_driver = NULL, *con_back = NULL;
3705 : int i, retval = -ENODEV;
3706 :
3707 : if (!try_module_get(owner))
3708 : return -ENODEV;
3709 :
3710 : WARN_CONSOLE_UNLOCKED();
3711 :
3712 : /* check if driver is registered and if it is unbindable */
3713 : for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3714 : con_driver = ®istered_con_driver[i];
3715 :
3716 : if (con_driver->con == csw &&
3717 : con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3718 : retval = 0;
3719 : break;
3720 : }
3721 : }
3722 :
3723 : if (retval)
3724 : goto err;
3725 :
3726 : retval = -ENODEV;
3727 :
3728 : /* check if backup driver exists */
3729 : for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3730 : con_back = ®istered_con_driver[i];
3731 :
3732 : if (con_back->con && con_back->con != csw) {
3733 : defcsw = con_back->con;
3734 : retval = 0;
3735 : break;
3736 : }
3737 : }
3738 :
3739 : if (retval)
3740 : goto err;
3741 :
3742 : if (!con_is_bound(csw))
3743 : goto err;
3744 :
3745 : first = max(first, con_driver->first);
3746 : last = min(last, con_driver->last);
3747 :
3748 : for (i = first; i <= last; i++) {
3749 : if (con_driver_map[i] == csw) {
3750 : module_put(csw->owner);
3751 : con_driver_map[i] = NULL;
3752 : }
3753 : }
3754 :
3755 : if (!con_is_bound(defcsw)) {
3756 : const struct consw *defconsw = conswitchp;
3757 :
3758 : defcsw->con_startup();
3759 : con_back->flag |= CON_DRIVER_FLAG_INIT;
3760 : /*
3761 : * vgacon may change the default driver to point
3762 : * to dummycon, we restore it here...
3763 : */
3764 : conswitchp = defconsw;
3765 : }
3766 :
3767 : if (!con_is_bound(csw))
3768 : con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3769 :
3770 : /* ignore return value, binding should not fail */
3771 : do_bind_con_driver(defcsw, first, last, deflt);
3772 : err:
3773 : module_put(owner);
3774 : return retval;
3775 :
3776 : }
3777 : EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3778 :
3779 : static int vt_bind(struct con_driver *con)
3780 : {
3781 : const struct consw *defcsw = NULL, *csw = NULL;
3782 : int i, more = 1, first = -1, last = -1, deflt = 0;
3783 :
3784 : if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3785 : goto err;
3786 :
3787 : csw = con->con;
3788 :
3789 : for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3790 : struct con_driver *con = ®istered_con_driver[i];
3791 :
3792 : if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3793 : defcsw = con->con;
3794 : break;
3795 : }
3796 : }
3797 :
3798 : if (!defcsw)
3799 : goto err;
3800 :
3801 : while (more) {
3802 : more = 0;
3803 :
3804 : for (i = con->first; i <= con->last; i++) {
3805 : if (con_driver_map[i] == defcsw) {
3806 : if (first == -1)
3807 : first = i;
3808 : last = i;
3809 : more = 1;
3810 : } else if (first != -1)
3811 : break;
3812 : }
3813 :
3814 : if (first == 0 && last == MAX_NR_CONSOLES -1)
3815 : deflt = 1;
3816 :
3817 : if (first != -1)
3818 : do_bind_con_driver(csw, first, last, deflt);
3819 :
3820 : first = -1;
3821 : last = -1;
3822 : deflt = 0;
3823 : }
3824 :
3825 : err:
3826 : return 0;
3827 : }
3828 :
3829 : static int vt_unbind(struct con_driver *con)
3830 : {
3831 : const struct consw *csw = NULL;
3832 : int i, more = 1, first = -1, last = -1, deflt = 0;
3833 : int ret;
3834 :
3835 : if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3836 : goto err;
3837 :
3838 : csw = con->con;
3839 :
3840 : while (more) {
3841 : more = 0;
3842 :
3843 : for (i = con->first; i <= con->last; i++) {
3844 : if (con_driver_map[i] == csw) {
3845 : if (first == -1)
3846 : first = i;
3847 : last = i;
3848 : more = 1;
3849 : } else if (first != -1)
3850 : break;
3851 : }
3852 :
3853 : if (first == 0 && last == MAX_NR_CONSOLES -1)
3854 : deflt = 1;
3855 :
3856 : if (first != -1) {
3857 : ret = do_unbind_con_driver(csw, first, last, deflt);
3858 : if (ret != 0)
3859 : return ret;
3860 : }
3861 :
3862 : first = -1;
3863 : last = -1;
3864 : deflt = 0;
3865 : }
3866 :
3867 : err:
3868 : return 0;
3869 : }
3870 : #else
3871 : static inline int vt_bind(struct con_driver *con)
3872 : {
3873 : return 0;
3874 : }
3875 : static inline int vt_unbind(struct con_driver *con)
3876 : {
3877 : return 0;
3878 : }
3879 : #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3880 :
3881 0 : static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3882 : const char *buf, size_t count)
3883 : {
3884 0 : struct con_driver *con = dev_get_drvdata(dev);
3885 0 : int bind = simple_strtoul(buf, NULL, 0);
3886 :
3887 0 : console_lock();
3888 :
3889 0 : if (bind)
3890 0 : vt_bind(con);
3891 : else
3892 0 : vt_unbind(con);
3893 :
3894 0 : console_unlock();
3895 :
3896 0 : return count;
3897 : }
3898 :
3899 0 : static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3900 : char *buf)
3901 : {
3902 0 : struct con_driver *con = dev_get_drvdata(dev);
3903 0 : int bind;
3904 :
3905 0 : console_lock();
3906 0 : bind = con_is_bound(con->con);
3907 0 : console_unlock();
3908 :
3909 0 : return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3910 : }
3911 :
3912 0 : static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3913 : char *buf)
3914 : {
3915 0 : struct con_driver *con = dev_get_drvdata(dev);
3916 :
3917 0 : return snprintf(buf, PAGE_SIZE, "%s %s\n",
3918 0 : (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3919 : con->desc);
3920 :
3921 : }
3922 :
3923 : static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3924 : static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3925 :
3926 : static struct attribute *con_dev_attrs[] = {
3927 : &dev_attr_bind.attr,
3928 : &dev_attr_name.attr,
3929 : NULL
3930 : };
3931 :
3932 : ATTRIBUTE_GROUPS(con_dev);
3933 :
3934 1 : static int vtconsole_init_device(struct con_driver *con)
3935 : {
3936 1 : con->flag |= CON_DRIVER_FLAG_ATTR;
3937 1 : return 0;
3938 : }
3939 :
3940 0 : static void vtconsole_deinit_device(struct con_driver *con)
3941 : {
3942 0 : con->flag &= ~CON_DRIVER_FLAG_ATTR;
3943 : }
3944 :
3945 : /**
3946 : * con_is_bound - checks if driver is bound to the console
3947 : * @csw: console driver
3948 : *
3949 : * RETURNS: zero if unbound, nonzero if bound
3950 : *
3951 : * Drivers can call this and if zero, they should release
3952 : * all resources allocated on con_startup()
3953 : */
3954 0 : int con_is_bound(const struct consw *csw)
3955 : {
3956 0 : int i, bound = 0;
3957 :
3958 0 : WARN_CONSOLE_UNLOCKED();
3959 :
3960 0 : for (i = 0; i < MAX_NR_CONSOLES; i++) {
3961 0 : if (con_driver_map[i] == csw) {
3962 : bound = 1;
3963 : break;
3964 : }
3965 : }
3966 :
3967 0 : return bound;
3968 : }
3969 : EXPORT_SYMBOL(con_is_bound);
3970 :
3971 : /**
3972 : * con_is_visible - checks whether the current console is visible
3973 : * @vc: virtual console
3974 : *
3975 : * RETURNS: zero if not visible, nonzero if visible
3976 : */
3977 65 : bool con_is_visible(const struct vc_data *vc)
3978 : {
3979 65 : WARN_CONSOLE_UNLOCKED();
3980 :
3981 65 : return *vc->vc_display_fg == vc;
3982 : }
3983 : EXPORT_SYMBOL(con_is_visible);
3984 :
3985 : /**
3986 : * con_debug_enter - prepare the console for the kernel debugger
3987 : * @vc: virtual console
3988 : *
3989 : * Called when the console is taken over by the kernel debugger, this
3990 : * function needs to save the current console state, then put the console
3991 : * into a state suitable for the kernel debugger.
3992 : *
3993 : * RETURNS:
3994 : * Zero on success, nonzero if a failure occurred when trying to prepare
3995 : * the console for the debugger.
3996 : */
3997 0 : int con_debug_enter(struct vc_data *vc)
3998 : {
3999 0 : int ret = 0;
4000 :
4001 0 : saved_fg_console = fg_console;
4002 0 : saved_last_console = last_console;
4003 0 : saved_want_console = want_console;
4004 0 : saved_vc_mode = vc->vc_mode;
4005 0 : saved_console_blanked = console_blanked;
4006 0 : vc->vc_mode = KD_TEXT;
4007 0 : console_blanked = 0;
4008 0 : if (vc->vc_sw->con_debug_enter)
4009 0 : ret = vc->vc_sw->con_debug_enter(vc);
4010 : #ifdef CONFIG_KGDB_KDB
4011 : /* Set the initial LINES variable if it is not already set */
4012 : if (vc->vc_rows < 999) {
4013 : int linecount;
4014 : char lns[4];
4015 : const char *setargs[3] = {
4016 : "set",
4017 : "LINES",
4018 : lns,
4019 : };
4020 : if (kdbgetintenv(setargs[0], &linecount)) {
4021 : snprintf(lns, 4, "%i", vc->vc_rows);
4022 : kdb_set(2, setargs);
4023 : }
4024 : }
4025 : if (vc->vc_cols < 999) {
4026 : int colcount;
4027 : char cols[4];
4028 : const char *setargs[3] = {
4029 : "set",
4030 : "COLUMNS",
4031 : cols,
4032 : };
4033 : if (kdbgetintenv(setargs[0], &colcount)) {
4034 : snprintf(cols, 4, "%i", vc->vc_cols);
4035 : kdb_set(2, setargs);
4036 : }
4037 : }
4038 : #endif /* CONFIG_KGDB_KDB */
4039 0 : return ret;
4040 : }
4041 : EXPORT_SYMBOL_GPL(con_debug_enter);
4042 :
4043 : /**
4044 : * con_debug_leave - restore console state
4045 : *
4046 : * Restore the console state to what it was before the kernel debugger
4047 : * was invoked.
4048 : *
4049 : * RETURNS:
4050 : * Zero on success, nonzero if a failure occurred when trying to restore
4051 : * the console.
4052 : */
4053 0 : int con_debug_leave(void)
4054 : {
4055 0 : struct vc_data *vc;
4056 0 : int ret = 0;
4057 :
4058 0 : fg_console = saved_fg_console;
4059 0 : last_console = saved_last_console;
4060 0 : want_console = saved_want_console;
4061 0 : console_blanked = saved_console_blanked;
4062 0 : vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4063 :
4064 0 : vc = vc_cons[fg_console].d;
4065 0 : if (vc->vc_sw->con_debug_leave)
4066 0 : ret = vc->vc_sw->con_debug_leave(vc);
4067 0 : return ret;
4068 : }
4069 : EXPORT_SYMBOL_GPL(con_debug_leave);
4070 :
4071 0 : static int do_register_con_driver(const struct consw *csw, int first, int last)
4072 : {
4073 0 : struct module *owner = csw->owner;
4074 0 : struct con_driver *con_driver;
4075 0 : const char *desc;
4076 0 : int i, retval;
4077 :
4078 0 : WARN_CONSOLE_UNLOCKED();
4079 :
4080 0 : if (!try_module_get(owner))
4081 : return -ENODEV;
4082 :
4083 0 : for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4084 0 : con_driver = ®istered_con_driver[i];
4085 :
4086 : /* already registered */
4087 0 : if (con_driver->con == csw) {
4088 0 : retval = -EBUSY;
4089 0 : goto err;
4090 : }
4091 : }
4092 :
4093 0 : desc = csw->con_startup();
4094 0 : if (!desc) {
4095 0 : retval = -ENODEV;
4096 0 : goto err;
4097 : }
4098 :
4099 0 : retval = -EINVAL;
4100 :
4101 0 : for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4102 0 : con_driver = ®istered_con_driver[i];
4103 :
4104 0 : if (con_driver->con == NULL &&
4105 0 : !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4106 0 : con_driver->con = csw;
4107 0 : con_driver->desc = desc;
4108 0 : con_driver->node = i;
4109 0 : con_driver->flag = CON_DRIVER_FLAG_MODULE |
4110 : CON_DRIVER_FLAG_INIT;
4111 0 : con_driver->first = first;
4112 0 : con_driver->last = last;
4113 0 : retval = 0;
4114 0 : break;
4115 : }
4116 : }
4117 :
4118 0 : if (retval)
4119 0 : goto err;
4120 :
4121 0 : con_driver->dev =
4122 0 : device_create_with_groups(vtconsole_class, NULL,
4123 : MKDEV(0, con_driver->node),
4124 : con_driver, con_dev_groups,
4125 : "vtcon%i", con_driver->node);
4126 0 : if (IS_ERR(con_driver->dev)) {
4127 0 : pr_warn("Unable to create device for %s; errno = %ld\n",
4128 : con_driver->desc, PTR_ERR(con_driver->dev));
4129 0 : con_driver->dev = NULL;
4130 : } else {
4131 0 : vtconsole_init_device(con_driver);
4132 : }
4133 :
4134 0 : err:
4135 0 : module_put(owner);
4136 0 : return retval;
4137 : }
4138 :
4139 :
4140 : /**
4141 : * do_unregister_con_driver - unregister console driver from console layer
4142 : * @csw: console driver
4143 : *
4144 : * DESCRIPTION: All drivers that registers to the console layer must
4145 : * call this function upon exit, or if the console driver is in a state
4146 : * where it won't be able to handle console services, such as the
4147 : * framebuffer console without loaded framebuffer drivers.
4148 : *
4149 : * The driver must unbind first prior to unregistration.
4150 : */
4151 0 : int do_unregister_con_driver(const struct consw *csw)
4152 : {
4153 0 : int i;
4154 :
4155 : /* cannot unregister a bound driver */
4156 0 : if (con_is_bound(csw))
4157 : return -EBUSY;
4158 :
4159 0 : if (csw == conswitchp)
4160 : return -EINVAL;
4161 :
4162 0 : for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4163 0 : struct con_driver *con_driver = ®istered_con_driver[i];
4164 :
4165 0 : if (con_driver->con == csw) {
4166 : /*
4167 : * Defer the removal of the sysfs entries since that
4168 : * will acquire the kernfs s_active lock and we can't
4169 : * acquire this lock while holding the console lock:
4170 : * the unbind sysfs entry imposes already the opposite
4171 : * order. Reset con already here to prevent any later
4172 : * lookup to succeed and mark this slot as zombie, so
4173 : * it won't get reused until we complete the removal
4174 : * in the deferred work.
4175 : */
4176 0 : con_driver->con = NULL;
4177 0 : con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4178 0 : schedule_work(&con_driver_unregister_work);
4179 :
4180 0 : return 0;
4181 : }
4182 : }
4183 :
4184 : return -ENODEV;
4185 : }
4186 : EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4187 :
4188 0 : static void con_driver_unregister_callback(struct work_struct *ignored)
4189 : {
4190 0 : int i;
4191 :
4192 0 : console_lock();
4193 :
4194 0 : for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4195 0 : struct con_driver *con_driver = ®istered_con_driver[i];
4196 :
4197 0 : if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4198 0 : continue;
4199 :
4200 0 : console_unlock();
4201 :
4202 0 : vtconsole_deinit_device(con_driver);
4203 0 : device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4204 :
4205 0 : console_lock();
4206 :
4207 0 : if (WARN_ON_ONCE(con_driver->con))
4208 0 : con_driver->con = NULL;
4209 0 : con_driver->desc = NULL;
4210 0 : con_driver->dev = NULL;
4211 0 : con_driver->node = 0;
4212 0 : WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4213 0 : con_driver->flag = 0;
4214 0 : con_driver->first = 0;
4215 0 : con_driver->last = 0;
4216 : }
4217 :
4218 0 : console_unlock();
4219 0 : }
4220 :
4221 : /*
4222 : * If we support more console drivers, this function is used
4223 : * when a driver wants to take over some existing consoles
4224 : * and become default driver for newly opened ones.
4225 : *
4226 : * do_take_over_console is basically a register followed by bind
4227 : */
4228 0 : int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4229 : {
4230 0 : int err;
4231 :
4232 0 : err = do_register_con_driver(csw, first, last);
4233 : /*
4234 : * If we get an busy error we still want to bind the console driver
4235 : * and return success, as we may have unbound the console driver
4236 : * but not unregistered it.
4237 : */
4238 0 : if (err == -EBUSY)
4239 : err = 0;
4240 0 : if (!err)
4241 0 : do_bind_con_driver(csw, first, last, deflt);
4242 :
4243 0 : return err;
4244 : }
4245 : EXPORT_SYMBOL_GPL(do_take_over_console);
4246 :
4247 :
4248 : /*
4249 : * give_up_console is a wrapper to unregister_con_driver. It will only
4250 : * work if driver is fully unbound.
4251 : */
4252 0 : void give_up_console(const struct consw *csw)
4253 : {
4254 0 : console_lock();
4255 0 : do_unregister_con_driver(csw);
4256 0 : console_unlock();
4257 0 : }
4258 :
4259 1 : static int __init vtconsole_class_init(void)
4260 : {
4261 1 : int i;
4262 :
4263 1 : vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4264 1 : if (IS_ERR(vtconsole_class)) {
4265 0 : pr_warn("Unable to create vt console class; errno = %ld\n",
4266 : PTR_ERR(vtconsole_class));
4267 0 : vtconsole_class = NULL;
4268 : }
4269 :
4270 : /* Add system drivers to sysfs */
4271 17 : for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4272 16 : struct con_driver *con = ®istered_con_driver[i];
4273 :
4274 16 : if (con->con && !con->dev) {
4275 2 : con->dev =
4276 1 : device_create_with_groups(vtconsole_class, NULL,
4277 : MKDEV(0, con->node),
4278 : con, con_dev_groups,
4279 : "vtcon%i", con->node);
4280 :
4281 1 : if (IS_ERR(con->dev)) {
4282 0 : pr_warn("Unable to create device for %s; errno = %ld\n",
4283 : con->desc, PTR_ERR(con->dev));
4284 0 : con->dev = NULL;
4285 : } else {
4286 16 : vtconsole_init_device(con);
4287 : }
4288 : }
4289 : }
4290 :
4291 1 : return 0;
4292 : }
4293 : postcore_initcall(vtconsole_class_init);
4294 :
4295 : #endif
4296 :
4297 : /*
4298 : * Screen blanking
4299 : */
4300 :
4301 0 : static int set_vesa_blanking(char __user *p)
4302 : {
4303 0 : unsigned int mode;
4304 :
4305 0 : if (get_user(mode, p + 1))
4306 : return -EFAULT;
4307 :
4308 0 : vesa_blank_mode = (mode < 4) ? mode : 0;
4309 0 : return 0;
4310 : }
4311 :
4312 0 : void do_blank_screen(int entering_gfx)
4313 : {
4314 0 : struct vc_data *vc = vc_cons[fg_console].d;
4315 0 : int i;
4316 :
4317 0 : might_sleep();
4318 :
4319 0 : WARN_CONSOLE_UNLOCKED();
4320 :
4321 0 : if (console_blanked) {
4322 0 : if (blank_state == blank_vesa_wait) {
4323 0 : blank_state = blank_off;
4324 0 : vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4325 : }
4326 0 : return;
4327 : }
4328 :
4329 : /* entering graphics mode? */
4330 0 : if (entering_gfx) {
4331 0 : hide_cursor(vc);
4332 0 : save_screen(vc);
4333 0 : vc->vc_sw->con_blank(vc, -1, 1);
4334 0 : console_blanked = fg_console + 1;
4335 0 : blank_state = blank_off;
4336 0 : set_origin(vc);
4337 0 : return;
4338 : }
4339 :
4340 0 : blank_state = blank_off;
4341 :
4342 : /* don't blank graphics */
4343 0 : if (vc->vc_mode != KD_TEXT) {
4344 0 : console_blanked = fg_console + 1;
4345 0 : return;
4346 : }
4347 :
4348 0 : hide_cursor(vc);
4349 0 : del_timer_sync(&console_timer);
4350 0 : blank_timer_expired = 0;
4351 :
4352 0 : save_screen(vc);
4353 : /* In case we need to reset origin, blanking hook returns 1 */
4354 0 : i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4355 0 : console_blanked = fg_console + 1;
4356 0 : if (i)
4357 0 : set_origin(vc);
4358 :
4359 0 : if (console_blank_hook && console_blank_hook(1))
4360 : return;
4361 :
4362 0 : if (vesa_off_interval && vesa_blank_mode) {
4363 0 : blank_state = blank_vesa_wait;
4364 0 : mod_timer(&console_timer, jiffies + vesa_off_interval);
4365 : }
4366 0 : vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4367 : }
4368 : EXPORT_SYMBOL(do_blank_screen);
4369 :
4370 : /*
4371 : * Called by timer as well as from vt_console_driver
4372 : */
4373 0 : void do_unblank_screen(int leaving_gfx)
4374 : {
4375 0 : struct vc_data *vc;
4376 :
4377 : /* This should now always be called from a "sane" (read: can schedule)
4378 : * context for the sake of the low level drivers, except in the special
4379 : * case of oops_in_progress
4380 : */
4381 0 : if (!oops_in_progress)
4382 0 : might_sleep();
4383 :
4384 0 : WARN_CONSOLE_UNLOCKED();
4385 :
4386 0 : ignore_poke = 0;
4387 0 : if (!console_blanked)
4388 : return;
4389 0 : if (!vc_cons_allocated(fg_console)) {
4390 : /* impossible */
4391 0 : pr_warn("unblank_screen: tty %d not allocated ??\n",
4392 : fg_console + 1);
4393 0 : return;
4394 : }
4395 0 : vc = vc_cons[fg_console].d;
4396 0 : if (vc->vc_mode != KD_TEXT)
4397 : return; /* but leave console_blanked != 0 */
4398 :
4399 0 : if (blankinterval) {
4400 0 : mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4401 0 : blank_state = blank_normal_wait;
4402 : }
4403 :
4404 0 : console_blanked = 0;
4405 0 : if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4406 : /* Low-level driver cannot restore -> do it ourselves */
4407 0 : update_screen(vc);
4408 0 : if (console_blank_hook)
4409 0 : console_blank_hook(0);
4410 0 : set_palette(vc);
4411 0 : set_cursor(vc);
4412 0 : vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4413 : }
4414 : EXPORT_SYMBOL(do_unblank_screen);
4415 :
4416 : /*
4417 : * This is called by the outside world to cause a forced unblank, mostly for
4418 : * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4419 : * call it with 1 as an argument and so force a mode restore... that may kill
4420 : * X or at least garbage the screen but would also make the Oops visible...
4421 : */
4422 0 : void unblank_screen(void)
4423 : {
4424 0 : do_unblank_screen(0);
4425 0 : }
4426 :
4427 : /*
4428 : * We defer the timer blanking to work queue so it can take the console mutex
4429 : * (console operations can still happen at irq time, but only from printk which
4430 : * has the console mutex. Not perfect yet, but better than no locking
4431 : */
4432 0 : static void blank_screen_t(struct timer_list *unused)
4433 : {
4434 0 : blank_timer_expired = 1;
4435 0 : schedule_work(&console_work);
4436 0 : }
4437 :
4438 0 : void poke_blanked_console(void)
4439 : {
4440 0 : WARN_CONSOLE_UNLOCKED();
4441 :
4442 : /* Add this so we quickly catch whoever might call us in a non
4443 : * safe context. Nowadays, unblank_screen() isn't to be called in
4444 : * atomic contexts and is allowed to schedule (with the special case
4445 : * of oops_in_progress, but that isn't of any concern for this
4446 : * function. --BenH.
4447 : */
4448 0 : might_sleep();
4449 :
4450 : /* This isn't perfectly race free, but a race here would be mostly harmless,
4451 : * at worse, we'll do a spurrious blank and it's unlikely
4452 : */
4453 0 : del_timer(&console_timer);
4454 0 : blank_timer_expired = 0;
4455 :
4456 0 : if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4457 : return;
4458 0 : if (console_blanked)
4459 0 : unblank_screen();
4460 0 : else if (blankinterval) {
4461 0 : mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4462 0 : blank_state = blank_normal_wait;
4463 : }
4464 : }
4465 :
4466 : /*
4467 : * Palettes
4468 : */
4469 :
4470 7 : static void set_palette(struct vc_data *vc)
4471 : {
4472 7 : WARN_CONSOLE_UNLOCKED();
4473 :
4474 7 : if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4475 0 : vc->vc_sw->con_set_palette(vc, color_table);
4476 7 : }
4477 :
4478 : /*
4479 : * Load palette into the DAC registers. arg points to a colour
4480 : * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4481 : */
4482 :
4483 0 : int con_set_cmap(unsigned char __user *arg)
4484 : {
4485 0 : int i, j, k;
4486 0 : unsigned char colormap[3*16];
4487 :
4488 0 : if (copy_from_user(colormap, arg, sizeof(colormap)))
4489 : return -EFAULT;
4490 :
4491 0 : console_lock();
4492 0 : for (i = k = 0; i < 16; i++) {
4493 0 : default_red[i] = colormap[k++];
4494 0 : default_grn[i] = colormap[k++];
4495 0 : default_blu[i] = colormap[k++];
4496 : }
4497 0 : for (i = 0; i < MAX_NR_CONSOLES; i++) {
4498 0 : if (!vc_cons_allocated(i))
4499 0 : continue;
4500 0 : for (j = k = 0; j < 16; j++) {
4501 0 : vc_cons[i].d->vc_palette[k++] = default_red[j];
4502 0 : vc_cons[i].d->vc_palette[k++] = default_grn[j];
4503 0 : vc_cons[i].d->vc_palette[k++] = default_blu[j];
4504 : }
4505 0 : set_palette(vc_cons[i].d);
4506 : }
4507 0 : console_unlock();
4508 :
4509 0 : return 0;
4510 : }
4511 :
4512 0 : int con_get_cmap(unsigned char __user *arg)
4513 : {
4514 0 : int i, k;
4515 0 : unsigned char colormap[3*16];
4516 :
4517 0 : console_lock();
4518 0 : for (i = k = 0; i < 16; i++) {
4519 0 : colormap[k++] = default_red[i];
4520 0 : colormap[k++] = default_grn[i];
4521 0 : colormap[k++] = default_blu[i];
4522 : }
4523 0 : console_unlock();
4524 :
4525 0 : if (copy_to_user(arg, colormap, sizeof(colormap)))
4526 0 : return -EFAULT;
4527 :
4528 : return 0;
4529 : }
4530 :
4531 6 : void reset_palette(struct vc_data *vc)
4532 : {
4533 6 : int j, k;
4534 102 : for (j=k=0; j<16; j++) {
4535 96 : vc->vc_palette[k++] = default_red[j];
4536 96 : vc->vc_palette[k++] = default_grn[j];
4537 96 : vc->vc_palette[k++] = default_blu[j];
4538 : }
4539 6 : set_palette(vc);
4540 6 : }
4541 :
4542 : /*
4543 : * Font switching
4544 : *
4545 : * Currently we only support fonts up to 32 pixels wide, at a maximum height
4546 : * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4547 : * depending on width) reserved for each character which is kinda wasty, but
4548 : * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4549 : * is up to the actual low-level console-driver convert data into its favorite
4550 : * format (maybe we should add a `fontoffset' field to the `display'
4551 : * structure so we won't have to convert the fontdata all the time.
4552 : * /Jes
4553 : */
4554 :
4555 : #define max_font_size 65536
4556 :
4557 0 : static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4558 : {
4559 0 : struct console_font font;
4560 0 : int rc = -EINVAL;
4561 0 : int c;
4562 :
4563 0 : if (op->data) {
4564 0 : font.data = kmalloc(max_font_size, GFP_KERNEL);
4565 0 : if (!font.data)
4566 : return -ENOMEM;
4567 : } else
4568 0 : font.data = NULL;
4569 :
4570 0 : console_lock();
4571 0 : if (vc->vc_mode != KD_TEXT)
4572 : rc = -EINVAL;
4573 0 : else if (vc->vc_sw->con_font_get)
4574 0 : rc = vc->vc_sw->con_font_get(vc, &font);
4575 : else
4576 : rc = -ENOSYS;
4577 0 : console_unlock();
4578 :
4579 0 : if (rc)
4580 0 : goto out;
4581 :
4582 0 : c = (font.width+7)/8 * 32 * font.charcount;
4583 :
4584 0 : if (op->data && font.charcount > op->charcount)
4585 0 : rc = -ENOSPC;
4586 0 : if (font.width > op->width || font.height > op->height)
4587 : rc = -ENOSPC;
4588 0 : if (rc)
4589 0 : goto out;
4590 :
4591 0 : op->height = font.height;
4592 0 : op->width = font.width;
4593 0 : op->charcount = font.charcount;
4594 :
4595 0 : if (op->data && copy_to_user(op->data, font.data, c))
4596 0 : rc = -EFAULT;
4597 :
4598 0 : out:
4599 0 : kfree(font.data);
4600 0 : return rc;
4601 : }
4602 :
4603 1 : static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4604 : {
4605 1 : struct console_font font;
4606 1 : int rc = -EINVAL;
4607 1 : int size;
4608 :
4609 1 : if (vc->vc_mode != KD_TEXT)
4610 : return -EINVAL;
4611 1 : if (!op->data)
4612 : return -EINVAL;
4613 1 : if (op->charcount > 512)
4614 : return -EINVAL;
4615 1 : if (op->width <= 0 || op->width > 32 || !op->height || op->height > 32)
4616 : return -EINVAL;
4617 1 : size = (op->width+7)/8 * 32 * op->charcount;
4618 1 : if (size > max_font_size)
4619 : return -ENOSPC;
4620 :
4621 1 : font.data = memdup_user(op->data, size);
4622 1 : if (IS_ERR(font.data))
4623 0 : return PTR_ERR(font.data);
4624 :
4625 1 : font.charcount = op->charcount;
4626 1 : font.width = op->width;
4627 1 : font.height = op->height;
4628 :
4629 1 : console_lock();
4630 1 : if (vc->vc_mode != KD_TEXT)
4631 : rc = -EINVAL;
4632 1 : else if (vc->vc_sw->con_font_set)
4633 0 : rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4634 : else
4635 : rc = -ENOSYS;
4636 1 : console_unlock();
4637 1 : kfree(font.data);
4638 1 : return rc;
4639 : }
4640 :
4641 0 : static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4642 : {
4643 0 : struct console_font font = {.width = op->width, .height = op->height};
4644 0 : char name[MAX_FONT_NAME];
4645 0 : char *s = name;
4646 0 : int rc;
4647 :
4648 :
4649 0 : if (!op->data)
4650 : s = NULL;
4651 0 : else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4652 : return -EFAULT;
4653 : else
4654 0 : name[MAX_FONT_NAME - 1] = 0;
4655 :
4656 0 : console_lock();
4657 0 : if (vc->vc_mode != KD_TEXT) {
4658 0 : console_unlock();
4659 0 : return -EINVAL;
4660 : }
4661 0 : if (vc->vc_sw->con_font_default)
4662 0 : rc = vc->vc_sw->con_font_default(vc, &font, s);
4663 : else
4664 : rc = -ENOSYS;
4665 0 : console_unlock();
4666 0 : if (!rc) {
4667 0 : op->width = font.width;
4668 0 : op->height = font.height;
4669 : }
4670 : return rc;
4671 : }
4672 :
4673 1 : int con_font_op(struct vc_data *vc, struct console_font_op *op)
4674 : {
4675 1 : switch (op->op) {
4676 1 : case KD_FONT_OP_SET:
4677 1 : return con_font_set(vc, op);
4678 0 : case KD_FONT_OP_GET:
4679 0 : return con_font_get(vc, op);
4680 0 : case KD_FONT_OP_SET_DEFAULT:
4681 0 : return con_font_default(vc, op);
4682 : case KD_FONT_OP_COPY:
4683 : /* was buggy and never really used */
4684 : return -EINVAL;
4685 : }
4686 0 : return -ENOSYS;
4687 : }
4688 :
4689 : /*
4690 : * Interface exported to selection and vcs.
4691 : */
4692 :
4693 : /* used by selection */
4694 0 : u16 screen_glyph(const struct vc_data *vc, int offset)
4695 : {
4696 0 : u16 w = scr_readw(screenpos(vc, offset, true));
4697 0 : u16 c = w & 0xff;
4698 :
4699 0 : if (w & vc->vc_hi_font_mask)
4700 0 : c |= 0x100;
4701 0 : return c;
4702 : }
4703 : EXPORT_SYMBOL_GPL(screen_glyph);
4704 :
4705 0 : u32 screen_glyph_unicode(const struct vc_data *vc, int n)
4706 : {
4707 0 : struct uni_screen *uniscr = get_vc_uniscr(vc);
4708 :
4709 0 : if (uniscr)
4710 0 : return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4711 0 : return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4712 : }
4713 : EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4714 :
4715 : /* used by vcs - note the word offset */
4716 0 : unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
4717 : {
4718 0 : return screenpos(vc, 2 * w_offset, viewed);
4719 : }
4720 : EXPORT_SYMBOL_GPL(screen_pos);
4721 :
4722 0 : void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
4723 : {
4724 : /* clamp values if they don't fit */
4725 0 : xy[0] = min(vc->state.x, 0xFFu);
4726 0 : xy[1] = min(vc->state.y, 0xFFu);
4727 0 : }
4728 :
4729 0 : void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
4730 : {
4731 0 : hide_cursor(vc);
4732 0 : gotoxy(vc, xy[0], xy[1]);
4733 0 : set_cursor(vc);
4734 0 : }
4735 :
4736 0 : u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
4737 : {
4738 0 : if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4739 0 : return softcursor_original;
4740 0 : return scr_readw(org);
4741 : }
4742 :
4743 0 : void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4744 : {
4745 0 : scr_writew(val, org);
4746 0 : if ((unsigned long)org == vc->vc_pos) {
4747 0 : softcursor_original = -1;
4748 0 : add_softcursor(vc);
4749 : }
4750 0 : }
4751 :
4752 0 : void vcs_scr_updated(struct vc_data *vc)
4753 : {
4754 0 : notify_update(vc);
4755 0 : }
4756 :
4757 0 : void vc_scrolldelta_helper(struct vc_data *c, int lines,
4758 : unsigned int rolled_over, void *base, unsigned int size)
4759 : {
4760 0 : unsigned long ubase = (unsigned long)base;
4761 0 : ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4762 0 : ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4763 0 : ptrdiff_t origin = (void *)c->vc_origin - base;
4764 0 : int margin = c->vc_size_row * 4;
4765 0 : int from, wrap, from_off, avail;
4766 :
4767 : /* Turn scrollback off */
4768 0 : if (!lines) {
4769 0 : c->vc_visible_origin = c->vc_origin;
4770 0 : return;
4771 : }
4772 :
4773 : /* Do we have already enough to allow jumping from 0 to the end? */
4774 0 : if (rolled_over > scr_end + margin) {
4775 0 : from = scr_end;
4776 0 : wrap = rolled_over + c->vc_size_row;
4777 : } else {
4778 0 : from = 0;
4779 0 : wrap = size;
4780 : }
4781 :
4782 0 : from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4783 0 : avail = (origin - from + wrap) % wrap;
4784 :
4785 : /* Only a little piece would be left? Show all incl. the piece! */
4786 0 : if (avail < 2 * margin)
4787 0 : margin = 0;
4788 0 : if (from_off < margin)
4789 0 : from_off = 0;
4790 0 : if (from_off > avail - margin)
4791 0 : from_off = avail;
4792 :
4793 0 : c->vc_visible_origin = ubase + (from + from_off) % wrap;
4794 : }
4795 : EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4796 :
4797 : /*
4798 : * Visible symbols for modules
4799 : */
4800 :
4801 : EXPORT_SYMBOL(color_table);
4802 : EXPORT_SYMBOL(default_red);
4803 : EXPORT_SYMBOL(default_grn);
4804 : EXPORT_SYMBOL(default_blu);
4805 : EXPORT_SYMBOL(update_region);
4806 : EXPORT_SYMBOL(redraw_screen);
4807 : EXPORT_SYMBOL(vc_resize);
4808 : EXPORT_SYMBOL(fg_console);
4809 : EXPORT_SYMBOL(console_blank_hook);
4810 : EXPORT_SYMBOL(console_blanked);
4811 : EXPORT_SYMBOL(vc_cons);
4812 : EXPORT_SYMBOL(global_cursor_default);
4813 : #ifndef VT_SINGLE_DRIVER
4814 : EXPORT_SYMBOL(give_up_console);
4815 : #endif
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