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1/*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 */
4
5/*
6 * Hopefully this will be a rather complete VT102 implementation.
7 *
8 * Beeping thanks to John T Kohl.
9 *
10 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
11 * Chars, and VT100 enhancements by Peter MacDonald.
12 *
13 * Copy and paste function by Andrew Haylett,
14 * some enhancements by Alessandro Rubini.
15 *
16 * Code to check for different video-cards mostly by Galen Hunt,
17 * <g-hunt@ee.utah.edu>
18 *
19 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
20 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
21 *
22 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
23 * Resizing of consoles, aeb, 940926
24 *
25 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
26 * <poe@daimi.aau.dk>
27 *
28 * User-defined bell sound, new setterm control sequences and printk
29 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
30 *
31 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
32 *
33 * Merge with the abstract console driver by Geert Uytterhoeven
34 * <geert@linux-m68k.org>, Jan 1997.
35 *
36 * Original m68k console driver modifications by
37 *
38 * - Arno Griffioen <arno@usn.nl>
39 * - David Carter <carter@cs.bris.ac.uk>
40 *
41 * The abstract console driver provides a generic interface for a text
42 * console. It supports VGA text mode, frame buffer based graphical consoles
43 * and special graphics processors that are only accessible through some
44 * registers (e.g. a TMS340x0 GSP).
45 *
46 * The interface to the hardware is specified using a special structure
47 * (struct consw) which contains function pointers to console operations
48 * (see <linux/console.h> for more information).
49 *
50 * Support for changeable cursor shape
51 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
52 *
53 * Ported to i386 and con_scrolldelta fixed
54 * by Emmanuel Marty <core@ggi-project.org>, April 1998
55 *
56 * Resurrected character buffers in videoram plus lots of other trickery
57 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
58 *
59 * Removed old-style timers, introduced console_timer, made timer
60 * deletion SMP-safe. 17Jun00, Andrew Morton
61 *
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
64 *
65 * Fixed UTF-8 mode so alternate charset modes always work according
66 * to control sequences interpreted in do_con_trol function
67 * preserving backward VT100 semigraphics compatibility,
68 * malformed UTF sequences represented as sequences of replacement glyphs,
69 * original codes or '?' as a last resort if replacement glyph is undefined
70 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
71 */
72
73#include <linux/module.h>
74#include <linux/types.h>
75#include <linux/sched.h>
76#include <linux/tty.h>
77#include <linux/tty_flip.h>
78#include <linux/kernel.h>
79#include <linux/string.h>
80#include <linux/errno.h>
81#include <linux/kd.h>
82#include <linux/slab.h>
83#include <linux/major.h>
84#include <linux/mm.h>
85#include <linux/console.h>
86#include <linux/init.h>
87#include <linux/mutex.h>
88#include <linux/vt_kern.h>
89#include <linux/selection.h>
90#include <linux/tiocl.h>
91#include <linux/kbd_kern.h>
92#include <linux/consolemap.h>
93#include <linux/timer.h>
94#include <linux/interrupt.h>
95#include <linux/workqueue.h>
96#include <linux/pm.h>
97#include <linux/font.h>
98#include <linux/bitops.h>
99#include <linux/notifier.h>
100#include <linux/device.h>
101#include <linux/io.h>
102#include <asm/system.h>
103#include <linux/uaccess.h>
104#include <linux/kdb.h>
105#include <linux/ctype.h>
106
107#define MAX_NR_CON_DRIVER 16
108
109#define CON_DRIVER_FLAG_MODULE 1
110#define CON_DRIVER_FLAG_INIT 2
111#define CON_DRIVER_FLAG_ATTR 4
112
113struct con_driver {
114 const struct consw *con;
115 const char *desc;
116 struct device *dev;
117 int node;
118 int first;
119 int last;
120 int flag;
121};
122
123static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
124const struct consw *conswitchp;
125
126/* A bitmap for codes <32. A bit of 1 indicates that the code
127 * corresponding to that bit number invokes some special action
128 * (such as cursor movement) and should not be displayed as a
129 * glyph unless the disp_ctrl mode is explicitly enabled.
130 */
131#define CTRL_ACTION 0x0d00ff81
132#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
133
134/*
135 * Here is the default bell parameters: 750HZ, 1/8th of a second
136 */
137#define DEFAULT_BELL_PITCH 750
138#define DEFAULT_BELL_DURATION (HZ/8)
139
140struct vc vc_cons [MAX_NR_CONSOLES];
141
142#ifndef VT_SINGLE_DRIVER
143static const struct consw *con_driver_map[MAX_NR_CONSOLES];
144#endif
145
146static int con_open(struct tty_struct *, struct file *);
147static void vc_init(struct vc_data *vc, unsigned int rows,
148 unsigned int cols, int do_clear);
149static void gotoxy(struct vc_data *vc, int new_x, int new_y);
150static void save_cur(struct vc_data *vc);
151static void reset_terminal(struct vc_data *vc, int do_clear);
152static void con_flush_chars(struct tty_struct *tty);
153static int set_vesa_blanking(char __user *p);
154static void set_cursor(struct vc_data *vc);
155static void hide_cursor(struct vc_data *vc);
156static void console_callback(struct work_struct *ignored);
157static void blank_screen_t(unsigned long dummy);
158static void set_palette(struct vc_data *vc);
159
160static int printable; /* Is console ready for printing? */
161int default_utf8 = true;
162module_param(default_utf8, int, S_IRUGO | S_IWUSR);
163int global_cursor_default = -1;
164module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
165
166static int cur_default = CUR_DEFAULT;
167module_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 */
173static int ignore_poke;
174
175int do_poke_blanked_console;
176int console_blanked;
177
178static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
179static int vesa_off_interval;
180static int blankinterval = 10*60;
181core_param(consoleblank, blankinterval, int, 0444);
182
183static DECLARE_WORK(console_work, console_callback);
184
185/*
186 * fg_console is the current virtual console,
187 * last_console is the last used one,
188 * want_console is the console we want to switch to,
189 * saved_* variants are for save/restore around kernel debugger enter/leave
190 */
191int fg_console;
192int last_console;
193int want_console = -1;
194static int saved_fg_console;
195static int saved_last_console;
196static int saved_want_console;
197static int saved_vc_mode;
198static int saved_console_blanked;
199
200/*
201 * For each existing display, we have a pointer to console currently visible
202 * on that display, allowing consoles other than fg_console to be refreshed
203 * appropriately. Unless the low-level driver supplies its own display_fg
204 * variable, we use this one for the "master display".
205 */
206static struct vc_data *master_display_fg;
207
208/*
209 * Unfortunately, we need to delay tty echo when we're currently writing to the
210 * console since the code is (and always was) not re-entrant, so we schedule
211 * all flip requests to process context with schedule-task() and run it from
212 * console_callback().
213 */
214
215/*
216 * For the same reason, we defer scrollback to the console callback.
217 */
218static int scrollback_delta;
219
220/*
221 * Hook so that the power management routines can (un)blank
222 * the console on our behalf.
223 */
224int (*console_blank_hook)(int);
225
226static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
227static int blank_state;
228static int blank_timer_expired;
229enum {
230 blank_off = 0,
231 blank_normal_wait,
232 blank_vesa_wait,
233};
234
235/*
236 * /sys/class/tty/tty0/
237 *
238 * the attribute 'active' contains the name of the current vc
239 * console and it supports poll() to detect vc switches
240 */
241static struct device *tty0dev;
242
243/*
244 * Notifier list for console events.
245 */
246static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
247
248int register_vt_notifier(struct notifier_block *nb)
249{
250 return atomic_notifier_chain_register(&vt_notifier_list, nb);
251}
252EXPORT_SYMBOL_GPL(register_vt_notifier);
253
254int unregister_vt_notifier(struct notifier_block *nb)
255{
256 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
257}
258EXPORT_SYMBOL_GPL(unregister_vt_notifier);
259
260static void notify_write(struct vc_data *vc, unsigned int unicode)
261{
262 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
263 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
264}
265
266static void notify_update(struct vc_data *vc)
267{
268 struct vt_notifier_param param = { .vc = vc };
269 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
270}
271/*
272 * Low-Level Functions
273 */
274
275#define IS_FG(vc) ((vc)->vc_num == fg_console)
276
277#ifdef VT_BUF_VRAM_ONLY
278#define DO_UPDATE(vc) 0
279#else
280#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
281#endif
282
283static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
284{
285 unsigned short *p;
286
287 if (!viewed)
288 p = (unsigned short *)(vc->vc_origin + offset);
289 else if (!vc->vc_sw->con_screen_pos)
290 p = (unsigned short *)(vc->vc_visible_origin + offset);
291 else
292 p = vc->vc_sw->con_screen_pos(vc, offset);
293 return p;
294}
295
296/* Called from the keyboard irq path.. */
297static inline void scrolldelta(int lines)
298{
299 /* FIXME */
300 /* scrolldelta needs some kind of consistency lock, but the BKL was
301 and still is not protecting versus the scheduled back end */
302 scrollback_delta += lines;
303 schedule_console_callback();
304}
305
306void schedule_console_callback(void)
307{
308 schedule_work(&console_work);
309}
310
311static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
312{
313 unsigned short *d, *s;
314
315 if (t+nr >= b)
316 nr = b - t - 1;
317 if (b > vc->vc_rows || t >= b || nr < 1)
318 return;
319 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
320 return;
321 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
322 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
323 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
324 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
325 vc->vc_size_row * nr);
326}
327
328static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
329{
330 unsigned short *s;
331 unsigned int step;
332
333 if (t+nr >= b)
334 nr = b - t - 1;
335 if (b > vc->vc_rows || t >= b || nr < 1)
336 return;
337 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
338 return;
339 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
340 step = vc->vc_cols * nr;
341 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
342 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
343}
344
345static void do_update_region(struct vc_data *vc, unsigned long start, int count)
346{
347#ifndef VT_BUF_VRAM_ONLY
348 unsigned int xx, yy, offset;
349 u16 *p;
350
351 p = (u16 *) start;
352 if (!vc->vc_sw->con_getxy) {
353 offset = (start - vc->vc_origin) / 2;
354 xx = offset % vc->vc_cols;
355 yy = offset / vc->vc_cols;
356 } else {
357 int nxx, nyy;
358 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
359 xx = nxx; yy = nyy;
360 }
361 for(;;) {
362 u16 attrib = scr_readw(p) & 0xff00;
363 int startx = xx;
364 u16 *q = p;
365 while (xx < vc->vc_cols && count) {
366 if (attrib != (scr_readw(p) & 0xff00)) {
367 if (p > q)
368 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
369 startx = xx;
370 q = p;
371 attrib = scr_readw(p) & 0xff00;
372 }
373 p++;
374 xx++;
375 count--;
376 }
377 if (p > q)
378 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
379 if (!count)
380 break;
381 xx = 0;
382 yy++;
383 if (vc->vc_sw->con_getxy) {
384 p = (u16 *)start;
385 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
386 }
387 }
388#endif
389}
390
391void update_region(struct vc_data *vc, unsigned long start, int count)
392{
393 WARN_CONSOLE_UNLOCKED();
394
395 if (DO_UPDATE(vc)) {
396 hide_cursor(vc);
397 do_update_region(vc, start, count);
398 set_cursor(vc);
399 }
400}
401
402/* Structure of attributes is hardware-dependent */
403
404static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
405 u8 _underline, u8 _reverse, u8 _italic)
406{
407 if (vc->vc_sw->con_build_attr)
408 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
409 _blink, _underline, _reverse, _italic);
410
411#ifndef VT_BUF_VRAM_ONLY
412/*
413 * ++roman: I completely changed the attribute format for monochrome
414 * mode (!can_do_color). The formerly used MDA (monochrome display
415 * adapter) format didn't allow the combination of certain effects.
416 * Now the attribute is just a bit vector:
417 * Bit 0..1: intensity (0..2)
418 * Bit 2 : underline
419 * Bit 3 : reverse
420 * Bit 7 : blink
421 */
422 {
423 u8 a = _color;
424 if (!vc->vc_can_do_color)
425 return _intensity |
426 (_italic ? 2 : 0) |
427 (_underline ? 4 : 0) |
428 (_reverse ? 8 : 0) |
429 (_blink ? 0x80 : 0);
430 if (_italic)
431 a = (a & 0xF0) | vc->vc_itcolor;
432 else if (_underline)
433 a = (a & 0xf0) | vc->vc_ulcolor;
434 else if (_intensity == 0)
435 a = (a & 0xf0) | vc->vc_ulcolor;
436 if (_reverse)
437 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
438 if (_blink)
439 a ^= 0x80;
440 if (_intensity == 2)
441 a ^= 0x08;
442 if (vc->vc_hi_font_mask == 0x100)
443 a <<= 1;
444 return a;
445 }
446#else
447 return 0;
448#endif
449}
450
451static void update_attr(struct vc_data *vc)
452{
453 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
454 vc->vc_blink, vc->vc_underline,
455 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
456 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
457}
458
459/* Note: inverting the screen twice should revert to the original state */
460void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
461{
462 unsigned short *p;
463
464 WARN_CONSOLE_UNLOCKED();
465
466 count /= 2;
467 p = screenpos(vc, offset, viewed);
468 if (vc->vc_sw->con_invert_region)
469 vc->vc_sw->con_invert_region(vc, p, count);
470#ifndef VT_BUF_VRAM_ONLY
471 else {
472 u16 *q = p;
473 int cnt = count;
474 u16 a;
475
476 if (!vc->vc_can_do_color) {
477 while (cnt--) {
478 a = scr_readw(q);
479 a ^= 0x0800;
480 scr_writew(a, q);
481 q++;
482 }
483 } else if (vc->vc_hi_font_mask == 0x100) {
484 while (cnt--) {
485 a = scr_readw(q);
486 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
487 scr_writew(a, q);
488 q++;
489 }
490 } else {
491 while (cnt--) {
492 a = scr_readw(q);
493 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
494 scr_writew(a, q);
495 q++;
496 }
497 }
498 }
499#endif
500 if (DO_UPDATE(vc))
501 do_update_region(vc, (unsigned long) p, count);
502}
503
504/* used by selection: complement pointer position */
505void complement_pos(struct vc_data *vc, int offset)
506{
507 static int old_offset = -1;
508 static unsigned short old;
509 static unsigned short oldx, oldy;
510
511 WARN_CONSOLE_UNLOCKED();
512
513 if (old_offset != -1 && old_offset >= 0 &&
514 old_offset < vc->vc_screenbuf_size) {
515 scr_writew(old, screenpos(vc, old_offset, 1));
516 if (DO_UPDATE(vc))
517 vc->vc_sw->con_putc(vc, old, oldy, oldx);
518 }
519
520 old_offset = offset;
521
522 if (offset != -1 && offset >= 0 &&
523 offset < vc->vc_screenbuf_size) {
524 unsigned short new;
525 unsigned short *p;
526 p = screenpos(vc, offset, 1);
527 old = scr_readw(p);
528 new = old ^ vc->vc_complement_mask;
529 scr_writew(new, p);
530 if (DO_UPDATE(vc)) {
531 oldx = (offset >> 1) % vc->vc_cols;
532 oldy = (offset >> 1) / vc->vc_cols;
533 vc->vc_sw->con_putc(vc, new, oldy, oldx);
534 }
535 }
536
537}
538
539static void insert_char(struct vc_data *vc, unsigned int nr)
540{
541 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
542
543 p = q + vc->vc_cols - nr - vc->vc_x;
544 while (--p >= q)
545 scr_writew(scr_readw(p), p + nr);
546 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
547 vc->vc_need_wrap = 0;
548 if (DO_UPDATE(vc)) {
549 unsigned short oldattr = vc->vc_attr;
550 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
551 vc->vc_cols - vc->vc_x - nr);
552 vc->vc_attr = vc->vc_video_erase_char >> 8;
553 while (nr--)
554 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
555 vc->vc_attr = oldattr;
556 }
557}
558
559static void delete_char(struct vc_data *vc, unsigned int nr)
560{
561 unsigned int i = vc->vc_x;
562 unsigned short *p = (unsigned short *)vc->vc_pos;
563
564 while (++i <= vc->vc_cols - nr) {
565 scr_writew(scr_readw(p+nr), p);
566 p++;
567 }
568 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
569 vc->vc_need_wrap = 0;
570 if (DO_UPDATE(vc)) {
571 unsigned short oldattr = vc->vc_attr;
572 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
573 vc->vc_cols - vc->vc_x - nr);
574 vc->vc_attr = vc->vc_video_erase_char >> 8;
575 while (nr--)
576 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
577 vc->vc_cols - 1 - nr);
578 vc->vc_attr = oldattr;
579 }
580}
581
582static int softcursor_original;
583
584static void add_softcursor(struct vc_data *vc)
585{
586 int i = scr_readw((u16 *) vc->vc_pos);
587 u32 type = vc->vc_cursor_type;
588
589 if (! (type & 0x10)) return;
590 if (softcursor_original != -1) return;
591 softcursor_original = i;
592 i |= ((type >> 8) & 0xff00 );
593 i ^= ((type) & 0xff00 );
594 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
595 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
596 scr_writew(i, (u16 *) vc->vc_pos);
597 if (DO_UPDATE(vc))
598 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
599}
600
601static void hide_softcursor(struct vc_data *vc)
602{
603 if (softcursor_original != -1) {
604 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
605 if (DO_UPDATE(vc))
606 vc->vc_sw->con_putc(vc, softcursor_original,
607 vc->vc_y, vc->vc_x);
608 softcursor_original = -1;
609 }
610}
611
612static void hide_cursor(struct vc_data *vc)
613{
614 if (vc == sel_cons)
615 clear_selection();
616 vc->vc_sw->con_cursor(vc, CM_ERASE);
617 hide_softcursor(vc);
618}
619
620static void set_cursor(struct vc_data *vc)
621{
622 if (!IS_FG(vc) || console_blanked ||
623 vc->vc_mode == KD_GRAPHICS)
624 return;
625 if (vc->vc_deccm) {
626 if (vc == sel_cons)
627 clear_selection();
628 add_softcursor(vc);
629 if ((vc->vc_cursor_type & 0x0f) != 1)
630 vc->vc_sw->con_cursor(vc, CM_DRAW);
631 } else
632 hide_cursor(vc);
633}
634
635static void set_origin(struct vc_data *vc)
636{
637 WARN_CONSOLE_UNLOCKED();
638
639 if (!CON_IS_VISIBLE(vc) ||
640 !vc->vc_sw->con_set_origin ||
641 !vc->vc_sw->con_set_origin(vc))
642 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
643 vc->vc_visible_origin = vc->vc_origin;
644 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
645 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
646}
647
648static inline void save_screen(struct vc_data *vc)
649{
650 WARN_CONSOLE_UNLOCKED();
651
652 if (vc->vc_sw->con_save_screen)
653 vc->vc_sw->con_save_screen(vc);
654}
655
656/*
657 * Redrawing of screen
658 */
659
660static void clear_buffer_attributes(struct vc_data *vc)
661{
662 unsigned short *p = (unsigned short *)vc->vc_origin;
663 int count = vc->vc_screenbuf_size / 2;
664 int mask = vc->vc_hi_font_mask | 0xff;
665
666 for (; count > 0; count--, p++) {
667 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
668 }
669}
670
671void redraw_screen(struct vc_data *vc, int is_switch)
672{
673 int redraw = 0;
674
675 WARN_CONSOLE_UNLOCKED();
676
677 if (!vc) {
678 /* strange ... */
679 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
680 return;
681 }
682
683 if (is_switch) {
684 struct vc_data *old_vc = vc_cons[fg_console].d;
685 if (old_vc == vc)
686 return;
687 if (!CON_IS_VISIBLE(vc))
688 redraw = 1;
689 *vc->vc_display_fg = vc;
690 fg_console = vc->vc_num;
691 hide_cursor(old_vc);
692 if (!CON_IS_VISIBLE(old_vc)) {
693 save_screen(old_vc);
694 set_origin(old_vc);
695 }
696 if (tty0dev)
697 sysfs_notify(&tty0dev->kobj, NULL, "active");
698 } else {
699 hide_cursor(vc);
700 redraw = 1;
701 }
702
703 if (redraw) {
704 int update;
705 int old_was_color = vc->vc_can_do_color;
706
707 set_origin(vc);
708 update = vc->vc_sw->con_switch(vc);
709 set_palette(vc);
710 /*
711 * If console changed from mono<->color, the best we can do
712 * is to clear the buffer attributes. As it currently stands,
713 * rebuilding new attributes from the old buffer is not doable
714 * without overly complex code.
715 */
716 if (old_was_color != vc->vc_can_do_color) {
717 update_attr(vc);
718 clear_buffer_attributes(vc);
719 }
720
721 /* Forcibly update if we're panicing */
722 if ((update && vc->vc_mode != KD_GRAPHICS) ||
723 vt_force_oops_output(vc))
724 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
725 }
726 set_cursor(vc);
727 if (is_switch) {
728 set_leds();
729 compute_shiftstate();
730 notify_update(vc);
731 }
732}
733
734/*
735 * Allocation, freeing and resizing of VTs.
736 */
737
738int vc_cons_allocated(unsigned int i)
739{
740 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
741}
742
743static void visual_init(struct vc_data *vc, int num, int init)
744{
745 /* ++Geert: vc->vc_sw->con_init determines console size */
746 if (vc->vc_sw)
747 module_put(vc->vc_sw->owner);
748 vc->vc_sw = conswitchp;
749#ifndef VT_SINGLE_DRIVER
750 if (con_driver_map[num])
751 vc->vc_sw = con_driver_map[num];
752#endif
753 __module_get(vc->vc_sw->owner);
754 vc->vc_num = num;
755 vc->vc_display_fg = &master_display_fg;
756 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
757 vc->vc_uni_pagedir = 0;
758 vc->vc_hi_font_mask = 0;
759 vc->vc_complement_mask = 0;
760 vc->vc_can_do_color = 0;
761 vc->vc_panic_force_write = false;
762 vc->vc_sw->con_init(vc, init);
763 if (!vc->vc_complement_mask)
764 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
765 vc->vc_s_complement_mask = vc->vc_complement_mask;
766 vc->vc_size_row = vc->vc_cols << 1;
767 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
768}
769
770int vc_allocate(unsigned int currcons) /* return 0 on success */
771{
772 WARN_CONSOLE_UNLOCKED();
773
774 if (currcons >= MAX_NR_CONSOLES)
775 return -ENXIO;
776 if (!vc_cons[currcons].d) {
777 struct vc_data *vc;
778 struct vt_notifier_param param;
779
780 /* prevent users from taking too much memory */
781 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
782 return -EPERM;
783
784 /* due to the granularity of kmalloc, we waste some memory here */
785 /* the alloc is done in two steps, to optimize the common situation
786 of a 25x80 console (structsize=216, screenbuf_size=4000) */
787 /* although the numbers above are not valid since long ago, the
788 point is still up-to-date and the comment still has its value
789 even if only as a historical artifact. --mj, July 1998 */
790 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
791 if (!vc)
792 return -ENOMEM;
793 vc_cons[currcons].d = vc;
794 tty_port_init(&vc->port);
795 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
796 visual_init(vc, currcons, 1);
797 if (!*vc->vc_uni_pagedir_loc)
798 con_set_default_unimap(vc);
799 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
800 if (!vc->vc_screenbuf) {
801 kfree(vc);
802 vc_cons[currcons].d = NULL;
803 return -ENOMEM;
804 }
805
806 /* If no drivers have overridden us and the user didn't pass a
807 boot option, default to displaying the cursor */
808 if (global_cursor_default == -1)
809 global_cursor_default = 1;
810
811 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
812 vcs_make_sysfs(currcons);
813 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
814 }
815 return 0;
816}
817
818static inline int resize_screen(struct vc_data *vc, int width, int height,
819 int user)
820{
821 /* Resizes the resolution of the display adapater */
822 int err = 0;
823
824 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
825 err = vc->vc_sw->con_resize(vc, width, height, user);
826
827 return err;
828}
829
830/*
831 * Change # of rows and columns (0 means unchanged/the size of fg_console)
832 * [this is to be used together with some user program
833 * like resize that changes the hardware videomode]
834 */
835#define VC_RESIZE_MAXCOL (32767)
836#define VC_RESIZE_MAXROW (32767)
837
838/**
839 * vc_do_resize - resizing method for the tty
840 * @tty: tty being resized
841 * @real_tty: real tty (different to tty if a pty/tty pair)
842 * @vc: virtual console private data
843 * @cols: columns
844 * @lines: lines
845 *
846 * Resize a virtual console, clipping according to the actual constraints.
847 * If the caller passes a tty structure then update the termios winsize
848 * information and perform any necessary signal handling.
849 *
850 * Caller must hold the console semaphore. Takes the termios mutex and
851 * ctrl_lock of the tty IFF a tty is passed.
852 */
853
854static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
855 unsigned int cols, unsigned int lines)
856{
857 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
858 unsigned long end;
859 unsigned int old_rows, old_row_size;
860 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
861 unsigned int user;
862 unsigned short *newscreen;
863
864 WARN_CONSOLE_UNLOCKED();
865
866 if (!vc)
867 return -ENXIO;
868
869 user = vc->vc_resize_user;
870 vc->vc_resize_user = 0;
871
872 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
873 return -EINVAL;
874
875 new_cols = (cols ? cols : vc->vc_cols);
876 new_rows = (lines ? lines : vc->vc_rows);
877 new_row_size = new_cols << 1;
878 new_screen_size = new_row_size * new_rows;
879
880 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
881 return 0;
882
883 newscreen = kmalloc(new_screen_size, GFP_USER);
884 if (!newscreen)
885 return -ENOMEM;
886
887 old_rows = vc->vc_rows;
888 old_row_size = vc->vc_size_row;
889
890 err = resize_screen(vc, new_cols, new_rows, user);
891 if (err) {
892 kfree(newscreen);
893 return err;
894 }
895
896 vc->vc_rows = new_rows;
897 vc->vc_cols = new_cols;
898 vc->vc_size_row = new_row_size;
899 vc->vc_screenbuf_size = new_screen_size;
900
901 rlth = min(old_row_size, new_row_size);
902 rrem = new_row_size - rlth;
903 old_origin = vc->vc_origin;
904 new_origin = (long) newscreen;
905 new_scr_end = new_origin + new_screen_size;
906
907 if (vc->vc_y > new_rows) {
908 if (old_rows - vc->vc_y < new_rows) {
909 /*
910 * Cursor near the bottom, copy contents from the
911 * bottom of buffer
912 */
913 old_origin += (old_rows - new_rows) * old_row_size;
914 } else {
915 /*
916 * Cursor is in no man's land, copy 1/2 screenful
917 * from the top and bottom of cursor position
918 */
919 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
920 }
921 }
922
923 end = old_origin + old_row_size * min(old_rows, new_rows);
924
925 update_attr(vc);
926
927 while (old_origin < end) {
928 scr_memcpyw((unsigned short *) new_origin,
929 (unsigned short *) old_origin, rlth);
930 if (rrem)
931 scr_memsetw((void *)(new_origin + rlth),
932 vc->vc_video_erase_char, rrem);
933 old_origin += old_row_size;
934 new_origin += new_row_size;
935 }
936 if (new_scr_end > new_origin)
937 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
938 new_scr_end - new_origin);
939 kfree(vc->vc_screenbuf);
940 vc->vc_screenbuf = newscreen;
941 vc->vc_screenbuf_size = new_screen_size;
942 set_origin(vc);
943
944 /* do part of a reset_terminal() */
945 vc->vc_top = 0;
946 vc->vc_bottom = vc->vc_rows;
947 gotoxy(vc, vc->vc_x, vc->vc_y);
948 save_cur(vc);
949
950 if (tty) {
951 /* Rewrite the requested winsize data with the actual
952 resulting sizes */
953 struct winsize ws;
954 memset(&ws, 0, sizeof(ws));
955 ws.ws_row = vc->vc_rows;
956 ws.ws_col = vc->vc_cols;
957 ws.ws_ypixel = vc->vc_scan_lines;
958 tty_do_resize(tty, &ws);
959 }
960
961 if (CON_IS_VISIBLE(vc))
962 update_screen(vc);
963 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
964 return err;
965}
966
967/**
968 * vc_resize - resize a VT
969 * @vc: virtual console
970 * @cols: columns
971 * @rows: rows
972 *
973 * Resize a virtual console as seen from the console end of things. We
974 * use the common vc_do_resize methods to update the structures. The
975 * caller must hold the console sem to protect console internals and
976 * vc->port.tty
977 */
978
979int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
980{
981 return vc_do_resize(vc->port.tty, vc, cols, rows);
982}
983
984/**
985 * vt_resize - resize a VT
986 * @tty: tty to resize
987 * @ws: winsize attributes
988 *
989 * Resize a virtual terminal. This is called by the tty layer as we
990 * register our own handler for resizing. The mutual helper does all
991 * the actual work.
992 *
993 * Takes the console sem and the called methods then take the tty
994 * termios_mutex and the tty ctrl_lock in that order.
995 */
996static int vt_resize(struct tty_struct *tty, struct winsize *ws)
997{
998 struct vc_data *vc = tty->driver_data;
999 int ret;
1000
1001 console_lock();
1002 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1003 console_unlock();
1004 return ret;
1005}
1006
1007void vc_deallocate(unsigned int currcons)
1008{
1009 WARN_CONSOLE_UNLOCKED();
1010
1011 if (vc_cons_allocated(currcons)) {
1012 struct vc_data *vc = vc_cons[currcons].d;
1013 struct vt_notifier_param param = { .vc = vc };
1014
1015 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1016 vcs_remove_sysfs(currcons);
1017 vc->vc_sw->con_deinit(vc);
1018 put_pid(vc->vt_pid);
1019 module_put(vc->vc_sw->owner);
1020 kfree(vc->vc_screenbuf);
1021 if (currcons >= MIN_NR_CONSOLES)
1022 kfree(vc);
1023 vc_cons[currcons].d = NULL;
1024 }
1025}
1026
1027/*
1028 * VT102 emulator
1029 */
1030
1031#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1032#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1033#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1034
1035#define decarm VC_REPEAT
1036#define decckm VC_CKMODE
1037#define kbdapplic VC_APPLIC
1038#define lnm VC_CRLF
1039
1040/*
1041 * this is what the terminal answers to a ESC-Z or csi0c query.
1042 */
1043#define VT100ID "\033[?1;2c"
1044#define VT102ID "\033[?6c"
1045
1046unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1047 8,12,10,14, 9,13,11,15 };
1048
1049/* the default colour table, for VGA+ colour systems */
1050int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1051 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1052int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1053 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1054int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1055 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1056
1057module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1058module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1059module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1060
1061/*
1062 * gotoxy() must verify all boundaries, because the arguments
1063 * might also be negative. If the given position is out of
1064 * bounds, the cursor is placed at the nearest margin.
1065 */
1066static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1067{
1068 int min_y, max_y;
1069
1070 if (new_x < 0)
1071 vc->vc_x = 0;
1072 else {
1073 if (new_x >= vc->vc_cols)
1074 vc->vc_x = vc->vc_cols - 1;
1075 else
1076 vc->vc_x = new_x;
1077 }
1078
1079 if (vc->vc_decom) {
1080 min_y = vc->vc_top;
1081 max_y = vc->vc_bottom;
1082 } else {
1083 min_y = 0;
1084 max_y = vc->vc_rows;
1085 }
1086 if (new_y < min_y)
1087 vc->vc_y = min_y;
1088 else if (new_y >= max_y)
1089 vc->vc_y = max_y - 1;
1090 else
1091 vc->vc_y = new_y;
1092 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1093 vc->vc_need_wrap = 0;
1094}
1095
1096/* for absolute user moves, when decom is set */
1097static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1098{
1099 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1100}
1101
1102void scrollback(struct vc_data *vc, int lines)
1103{
1104 if (!lines)
1105 lines = vc->vc_rows / 2;
1106 scrolldelta(-lines);
1107}
1108
1109void scrollfront(struct vc_data *vc, int lines)
1110{
1111 if (!lines)
1112 lines = vc->vc_rows / 2;
1113 scrolldelta(lines);
1114}
1115
1116static void lf(struct vc_data *vc)
1117{
1118 /* don't scroll if above bottom of scrolling region, or
1119 * if below scrolling region
1120 */
1121 if (vc->vc_y + 1 == vc->vc_bottom)
1122 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1123 else if (vc->vc_y < vc->vc_rows - 1) {
1124 vc->vc_y++;
1125 vc->vc_pos += vc->vc_size_row;
1126 }
1127 vc->vc_need_wrap = 0;
1128 notify_write(vc, '\n');
1129}
1130
1131static void ri(struct vc_data *vc)
1132{
1133 /* don't scroll if below top of scrolling region, or
1134 * if above scrolling region
1135 */
1136 if (vc->vc_y == vc->vc_top)
1137 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1138 else if (vc->vc_y > 0) {
1139 vc->vc_y--;
1140 vc->vc_pos -= vc->vc_size_row;
1141 }
1142 vc->vc_need_wrap = 0;
1143}
1144
1145static inline void cr(struct vc_data *vc)
1146{
1147 vc->vc_pos -= vc->vc_x << 1;
1148 vc->vc_need_wrap = vc->vc_x = 0;
1149 notify_write(vc, '\r');
1150}
1151
1152static inline void bs(struct vc_data *vc)
1153{
1154 if (vc->vc_x) {
1155 vc->vc_pos -= 2;
1156 vc->vc_x--;
1157 vc->vc_need_wrap = 0;
1158 notify_write(vc, '\b');
1159 }
1160}
1161
1162static inline void del(struct vc_data *vc)
1163{
1164 /* ignored */
1165}
1166
1167static void csi_J(struct vc_data *vc, int vpar)
1168{
1169 unsigned int count;
1170 unsigned short * start;
1171
1172 switch (vpar) {
1173 case 0: /* erase from cursor to end of display */
1174 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1175 start = (unsigned short *)vc->vc_pos;
1176 if (DO_UPDATE(vc)) {
1177 /* do in two stages */
1178 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1179 vc->vc_cols - vc->vc_x);
1180 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1181 vc->vc_rows - vc->vc_y - 1,
1182 vc->vc_cols);
1183 }
1184 break;
1185 case 1: /* erase from start to cursor */
1186 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1187 start = (unsigned short *)vc->vc_origin;
1188 if (DO_UPDATE(vc)) {
1189 /* do in two stages */
1190 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1191 vc->vc_cols);
1192 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1193 vc->vc_x + 1);
1194 }
1195 break;
1196 case 3: /* erase scroll-back buffer (and whole display) */
1197 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1198 vc->vc_screenbuf_size >> 1);
1199 set_origin(vc);
1200 if (CON_IS_VISIBLE(vc))
1201 update_screen(vc);
1202 /* fall through */
1203 case 2: /* erase whole display */
1204 count = vc->vc_cols * vc->vc_rows;
1205 start = (unsigned short *)vc->vc_origin;
1206 if (DO_UPDATE(vc))
1207 vc->vc_sw->con_clear(vc, 0, 0,
1208 vc->vc_rows,
1209 vc->vc_cols);
1210 break;
1211 default:
1212 return;
1213 }
1214 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1215 vc->vc_need_wrap = 0;
1216}
1217
1218static void csi_K(struct vc_data *vc, int vpar)
1219{
1220 unsigned int count;
1221 unsigned short * start;
1222
1223 switch (vpar) {
1224 case 0: /* erase from cursor to end of line */
1225 count = vc->vc_cols - vc->vc_x;
1226 start = (unsigned short *)vc->vc_pos;
1227 if (DO_UPDATE(vc))
1228 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1229 vc->vc_cols - vc->vc_x);
1230 break;
1231 case 1: /* erase from start of line to cursor */
1232 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1233 count = vc->vc_x + 1;
1234 if (DO_UPDATE(vc))
1235 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1236 vc->vc_x + 1);
1237 break;
1238 case 2: /* erase whole line */
1239 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1240 count = vc->vc_cols;
1241 if (DO_UPDATE(vc))
1242 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1243 vc->vc_cols);
1244 break;
1245 default:
1246 return;
1247 }
1248 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1249 vc->vc_need_wrap = 0;
1250}
1251
1252static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1253{ /* not vt100? */
1254 int count;
1255
1256 if (!vpar)
1257 vpar++;
1258 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1259
1260 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1261 if (DO_UPDATE(vc))
1262 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1263 vc->vc_need_wrap = 0;
1264}
1265
1266static void default_attr(struct vc_data *vc)
1267{
1268 vc->vc_intensity = 1;
1269 vc->vc_italic = 0;
1270 vc->vc_underline = 0;
1271 vc->vc_reverse = 0;
1272 vc->vc_blink = 0;
1273 vc->vc_color = vc->vc_def_color;
1274}
1275
1276/* console_lock is held */
1277static void csi_m(struct vc_data *vc)
1278{
1279 int i;
1280
1281 for (i = 0; i <= vc->vc_npar; i++)
1282 switch (vc->vc_par[i]) {
1283 case 0: /* all attributes off */
1284 default_attr(vc);
1285 break;
1286 case 1:
1287 vc->vc_intensity = 2;
1288 break;
1289 case 2:
1290 vc->vc_intensity = 0;
1291 break;
1292 case 3:
1293 vc->vc_italic = 1;
1294 break;
1295 case 4:
1296 vc->vc_underline = 1;
1297 break;
1298 case 5:
1299 vc->vc_blink = 1;
1300 break;
1301 case 7:
1302 vc->vc_reverse = 1;
1303 break;
1304 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1305 * Select primary font, don't display
1306 * control chars if defined, don't set
1307 * bit 8 on output.
1308 */
1309 vc->vc_translate = set_translate(vc->vc_charset == 0
1310 ? vc->vc_G0_charset
1311 : vc->vc_G1_charset, vc);
1312 vc->vc_disp_ctrl = 0;
1313 vc->vc_toggle_meta = 0;
1314 break;
1315 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1316 * Select first alternate font, lets
1317 * chars < 32 be displayed as ROM chars.
1318 */
1319 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1320 vc->vc_disp_ctrl = 1;
1321 vc->vc_toggle_meta = 0;
1322 break;
1323 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1324 * Select second alternate font, toggle
1325 * high bit before displaying as ROM char.
1326 */
1327 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1328 vc->vc_disp_ctrl = 1;
1329 vc->vc_toggle_meta = 1;
1330 break;
1331 case 21:
1332 case 22:
1333 vc->vc_intensity = 1;
1334 break;
1335 case 23:
1336 vc->vc_italic = 0;
1337 break;
1338 case 24:
1339 vc->vc_underline = 0;
1340 break;
1341 case 25:
1342 vc->vc_blink = 0;
1343 break;
1344 case 27:
1345 vc->vc_reverse = 0;
1346 break;
1347 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1348 * Enables underscore, white foreground
1349 * with white underscore (Linux - use
1350 * default foreground).
1351 */
1352 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1353 vc->vc_underline = 1;
1354 break;
1355 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1356 * Disable underline option.
1357 * Reset colour to default? It did this
1358 * before...
1359 */
1360 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1361 vc->vc_underline = 0;
1362 break;
1363 case 49:
1364 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1365 break;
1366 default:
1367 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1368 vc->vc_color = color_table[vc->vc_par[i] - 30]
1369 | (vc->vc_color & 0xf0);
1370 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1371 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1372 | (vc->vc_color & 0x0f);
1373 break;
1374 }
1375 update_attr(vc);
1376}
1377
1378static void respond_string(const char *p, struct tty_struct *tty)
1379{
1380 while (*p) {
1381 tty_insert_flip_char(tty, *p, 0);
1382 p++;
1383 }
1384 con_schedule_flip(tty);
1385}
1386
1387static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1388{
1389 char buf[40];
1390
1391 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1392 respond_string(buf, tty);
1393}
1394
1395static inline void status_report(struct tty_struct *tty)
1396{
1397 respond_string("\033[0n", tty); /* Terminal ok */
1398}
1399
1400static inline void respond_ID(struct tty_struct * tty)
1401{
1402 respond_string(VT102ID, tty);
1403}
1404
1405void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1406{
1407 char buf[8];
1408
1409 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1410 (char)('!' + mry));
1411 respond_string(buf, tty);
1412}
1413
1414/* invoked via ioctl(TIOCLINUX) and through set_selection */
1415int mouse_reporting(void)
1416{
1417 return vc_cons[fg_console].d->vc_report_mouse;
1418}
1419
1420/* console_lock is held */
1421static void set_mode(struct vc_data *vc, int on_off)
1422{
1423 int i;
1424
1425 for (i = 0; i <= vc->vc_npar; i++)
1426 if (vc->vc_ques) {
1427 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1428 case 1: /* Cursor keys send ^[Ox/^[[x */
1429 if (on_off)
1430 set_kbd(vc, decckm);
1431 else
1432 clr_kbd(vc, decckm);
1433 break;
1434 case 3: /* 80/132 mode switch unimplemented */
1435 vc->vc_deccolm = on_off;
1436#if 0
1437 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1438 /* this alone does not suffice; some user mode
1439 utility has to change the hardware regs */
1440#endif
1441 break;
1442 case 5: /* Inverted screen on/off */
1443 if (vc->vc_decscnm != on_off) {
1444 vc->vc_decscnm = on_off;
1445 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1446 update_attr(vc);
1447 }
1448 break;
1449 case 6: /* Origin relative/absolute */
1450 vc->vc_decom = on_off;
1451 gotoxay(vc, 0, 0);
1452 break;
1453 case 7: /* Autowrap on/off */
1454 vc->vc_decawm = on_off;
1455 break;
1456 case 8: /* Autorepeat on/off */
1457 if (on_off)
1458 set_kbd(vc, decarm);
1459 else
1460 clr_kbd(vc, decarm);
1461 break;
1462 case 9:
1463 vc->vc_report_mouse = on_off ? 1 : 0;
1464 break;
1465 case 25: /* Cursor on/off */
1466 vc->vc_deccm = on_off;
1467 break;
1468 case 1000:
1469 vc->vc_report_mouse = on_off ? 2 : 0;
1470 break;
1471 }
1472 } else {
1473 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1474 case 3: /* Monitor (display ctrls) */
1475 vc->vc_disp_ctrl = on_off;
1476 break;
1477 case 4: /* Insert Mode on/off */
1478 vc->vc_decim = on_off;
1479 break;
1480 case 20: /* Lf, Enter == CrLf/Lf */
1481 if (on_off)
1482 set_kbd(vc, lnm);
1483 else
1484 clr_kbd(vc, lnm);
1485 break;
1486 }
1487 }
1488}
1489
1490/* console_lock is held */
1491static void setterm_command(struct vc_data *vc)
1492{
1493 switch(vc->vc_par[0]) {
1494 case 1: /* set color for underline mode */
1495 if (vc->vc_can_do_color &&
1496 vc->vc_par[1] < 16) {
1497 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1498 if (vc->vc_underline)
1499 update_attr(vc);
1500 }
1501 break;
1502 case 2: /* set color for half intensity mode */
1503 if (vc->vc_can_do_color &&
1504 vc->vc_par[1] < 16) {
1505 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1506 if (vc->vc_intensity == 0)
1507 update_attr(vc);
1508 }
1509 break;
1510 case 8: /* store colors as defaults */
1511 vc->vc_def_color = vc->vc_attr;
1512 if (vc->vc_hi_font_mask == 0x100)
1513 vc->vc_def_color >>= 1;
1514 default_attr(vc);
1515 update_attr(vc);
1516 break;
1517 case 9: /* set blanking interval */
1518 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1519 poke_blanked_console();
1520 break;
1521 case 10: /* set bell frequency in Hz */
1522 if (vc->vc_npar >= 1)
1523 vc->vc_bell_pitch = vc->vc_par[1];
1524 else
1525 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1526 break;
1527 case 11: /* set bell duration in msec */
1528 if (vc->vc_npar >= 1)
1529 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1530 vc->vc_par[1] * HZ / 1000 : 0;
1531 else
1532 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1533 break;
1534 case 12: /* bring specified console to the front */
1535 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1536 set_console(vc->vc_par[1] - 1);
1537 break;
1538 case 13: /* unblank the screen */
1539 poke_blanked_console();
1540 break;
1541 case 14: /* set vesa powerdown interval */
1542 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1543 break;
1544 case 15: /* activate the previous console */
1545 set_console(last_console);
1546 break;
1547 }
1548}
1549
1550/* console_lock is held */
1551static void csi_at(struct vc_data *vc, unsigned int nr)
1552{
1553 if (nr > vc->vc_cols - vc->vc_x)
1554 nr = vc->vc_cols - vc->vc_x;
1555 else if (!nr)
1556 nr = 1;
1557 insert_char(vc, nr);
1558}
1559
1560/* console_lock is held */
1561static void csi_L(struct vc_data *vc, unsigned int nr)
1562{
1563 if (nr > vc->vc_rows - vc->vc_y)
1564 nr = vc->vc_rows - vc->vc_y;
1565 else if (!nr)
1566 nr = 1;
1567 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1568 vc->vc_need_wrap = 0;
1569}
1570
1571/* console_lock is held */
1572static void csi_P(struct vc_data *vc, unsigned int nr)
1573{
1574 if (nr > vc->vc_cols - vc->vc_x)
1575 nr = vc->vc_cols - vc->vc_x;
1576 else if (!nr)
1577 nr = 1;
1578 delete_char(vc, nr);
1579}
1580
1581/* console_lock is held */
1582static void csi_M(struct vc_data *vc, unsigned int nr)
1583{
1584 if (nr > vc->vc_rows - vc->vc_y)
1585 nr = vc->vc_rows - vc->vc_y;
1586 else if (!nr)
1587 nr=1;
1588 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1589 vc->vc_need_wrap = 0;
1590}
1591
1592/* console_lock is held (except via vc_init->reset_terminal */
1593static void save_cur(struct vc_data *vc)
1594{
1595 vc->vc_saved_x = vc->vc_x;
1596 vc->vc_saved_y = vc->vc_y;
1597 vc->vc_s_intensity = vc->vc_intensity;
1598 vc->vc_s_italic = vc->vc_italic;
1599 vc->vc_s_underline = vc->vc_underline;
1600 vc->vc_s_blink = vc->vc_blink;
1601 vc->vc_s_reverse = vc->vc_reverse;
1602 vc->vc_s_charset = vc->vc_charset;
1603 vc->vc_s_color = vc->vc_color;
1604 vc->vc_saved_G0 = vc->vc_G0_charset;
1605 vc->vc_saved_G1 = vc->vc_G1_charset;
1606}
1607
1608/* console_lock is held */
1609static void restore_cur(struct vc_data *vc)
1610{
1611 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1612 vc->vc_intensity = vc->vc_s_intensity;
1613 vc->vc_italic = vc->vc_s_italic;
1614 vc->vc_underline = vc->vc_s_underline;
1615 vc->vc_blink = vc->vc_s_blink;
1616 vc->vc_reverse = vc->vc_s_reverse;
1617 vc->vc_charset = vc->vc_s_charset;
1618 vc->vc_color = vc->vc_s_color;
1619 vc->vc_G0_charset = vc->vc_saved_G0;
1620 vc->vc_G1_charset = vc->vc_saved_G1;
1621 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1622 update_attr(vc);
1623 vc->vc_need_wrap = 0;
1624}
1625
1626enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1627 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1628 ESpalette };
1629
1630/* console_lock is held (except via vc_init()) */
1631static void reset_terminal(struct vc_data *vc, int do_clear)
1632{
1633 vc->vc_top = 0;
1634 vc->vc_bottom = vc->vc_rows;
1635 vc->vc_state = ESnormal;
1636 vc->vc_ques = 0;
1637 vc->vc_translate = set_translate(LAT1_MAP, vc);
1638 vc->vc_G0_charset = LAT1_MAP;
1639 vc->vc_G1_charset = GRAF_MAP;
1640 vc->vc_charset = 0;
1641 vc->vc_need_wrap = 0;
1642 vc->vc_report_mouse = 0;
1643 vc->vc_utf = default_utf8;
1644 vc->vc_utf_count = 0;
1645
1646 vc->vc_disp_ctrl = 0;
1647 vc->vc_toggle_meta = 0;
1648
1649 vc->vc_decscnm = 0;
1650 vc->vc_decom = 0;
1651 vc->vc_decawm = 1;
1652 vc->vc_deccm = global_cursor_default;
1653 vc->vc_decim = 0;
1654
1655 set_kbd(vc, decarm);
1656 clr_kbd(vc, decckm);
1657 clr_kbd(vc, kbdapplic);
1658 clr_kbd(vc, lnm);
1659 kbd_table[vc->vc_num].lockstate = 0;
1660 kbd_table[vc->vc_num].slockstate = 0;
1661 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1662 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1663 /* do not do set_leds here because this causes an endless tasklet loop
1664 when the keyboard hasn't been initialized yet */
1665
1666 vc->vc_cursor_type = cur_default;
1667 vc->vc_complement_mask = vc->vc_s_complement_mask;
1668
1669 default_attr(vc);
1670 update_attr(vc);
1671
1672 vc->vc_tab_stop[0] = 0x01010100;
1673 vc->vc_tab_stop[1] =
1674 vc->vc_tab_stop[2] =
1675 vc->vc_tab_stop[3] =
1676 vc->vc_tab_stop[4] =
1677 vc->vc_tab_stop[5] =
1678 vc->vc_tab_stop[6] =
1679 vc->vc_tab_stop[7] = 0x01010101;
1680
1681 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1682 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1683
1684 gotoxy(vc, 0, 0);
1685 save_cur(vc);
1686 if (do_clear)
1687 csi_J(vc, 2);
1688}
1689
1690/* console_lock is held */
1691static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1692{
1693 /*
1694 * Control characters can be used in the _middle_
1695 * of an escape sequence.
1696 */
1697 switch (c) {
1698 case 0:
1699 return;
1700 case 7:
1701 if (vc->vc_bell_duration)
1702 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1703 return;
1704 case 8:
1705 bs(vc);
1706 return;
1707 case 9:
1708 vc->vc_pos -= (vc->vc_x << 1);
1709 while (vc->vc_x < vc->vc_cols - 1) {
1710 vc->vc_x++;
1711 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1712 break;
1713 }
1714 vc->vc_pos += (vc->vc_x << 1);
1715 notify_write(vc, '\t');
1716 return;
1717 case 10: case 11: case 12:
1718 lf(vc);
1719 if (!is_kbd(vc, lnm))
1720 return;
1721 case 13:
1722 cr(vc);
1723 return;
1724 case 14:
1725 vc->vc_charset = 1;
1726 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1727 vc->vc_disp_ctrl = 1;
1728 return;
1729 case 15:
1730 vc->vc_charset = 0;
1731 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1732 vc->vc_disp_ctrl = 0;
1733 return;
1734 case 24: case 26:
1735 vc->vc_state = ESnormal;
1736 return;
1737 case 27:
1738 vc->vc_state = ESesc;
1739 return;
1740 case 127:
1741 del(vc);
1742 return;
1743 case 128+27:
1744 vc->vc_state = ESsquare;
1745 return;
1746 }
1747 switch(vc->vc_state) {
1748 case ESesc:
1749 vc->vc_state = ESnormal;
1750 switch (c) {
1751 case '[':
1752 vc->vc_state = ESsquare;
1753 return;
1754 case ']':
1755 vc->vc_state = ESnonstd;
1756 return;
1757 case '%':
1758 vc->vc_state = ESpercent;
1759 return;
1760 case 'E':
1761 cr(vc);
1762 lf(vc);
1763 return;
1764 case 'M':
1765 ri(vc);
1766 return;
1767 case 'D':
1768 lf(vc);
1769 return;
1770 case 'H':
1771 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1772 return;
1773 case 'Z':
1774 respond_ID(tty);
1775 return;
1776 case '7':
1777 save_cur(vc);
1778 return;
1779 case '8':
1780 restore_cur(vc);
1781 return;
1782 case '(':
1783 vc->vc_state = ESsetG0;
1784 return;
1785 case ')':
1786 vc->vc_state = ESsetG1;
1787 return;
1788 case '#':
1789 vc->vc_state = EShash;
1790 return;
1791 case 'c':
1792 reset_terminal(vc, 1);
1793 return;
1794 case '>': /* Numeric keypad */
1795 clr_kbd(vc, kbdapplic);
1796 return;
1797 case '=': /* Appl. keypad */
1798 set_kbd(vc, kbdapplic);
1799 return;
1800 }
1801 return;
1802 case ESnonstd:
1803 if (c=='P') { /* palette escape sequence */
1804 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1805 vc->vc_par[vc->vc_npar] = 0;
1806 vc->vc_npar = 0;
1807 vc->vc_state = ESpalette;
1808 return;
1809 } else if (c=='R') { /* reset palette */
1810 reset_palette(vc);
1811 vc->vc_state = ESnormal;
1812 } else
1813 vc->vc_state = ESnormal;
1814 return;
1815 case ESpalette:
1816 if (isxdigit(c)) {
1817 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1818 if (vc->vc_npar == 7) {
1819 int i = vc->vc_par[0] * 3, j = 1;
1820 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1821 vc->vc_palette[i++] += vc->vc_par[j++];
1822 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1823 vc->vc_palette[i++] += vc->vc_par[j++];
1824 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1825 vc->vc_palette[i] += vc->vc_par[j];
1826 set_palette(vc);
1827 vc->vc_state = ESnormal;
1828 }
1829 } else
1830 vc->vc_state = ESnormal;
1831 return;
1832 case ESsquare:
1833 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1834 vc->vc_par[vc->vc_npar] = 0;
1835 vc->vc_npar = 0;
1836 vc->vc_state = ESgetpars;
1837 if (c == '[') { /* Function key */
1838 vc->vc_state=ESfunckey;
1839 return;
1840 }
1841 vc->vc_ques = (c == '?');
1842 if (vc->vc_ques)
1843 return;
1844 case ESgetpars:
1845 if (c == ';' && vc->vc_npar < NPAR - 1) {
1846 vc->vc_npar++;
1847 return;
1848 } else if (c>='0' && c<='9') {
1849 vc->vc_par[vc->vc_npar] *= 10;
1850 vc->vc_par[vc->vc_npar] += c - '0';
1851 return;
1852 } else
1853 vc->vc_state = ESgotpars;
1854 case ESgotpars:
1855 vc->vc_state = ESnormal;
1856 switch(c) {
1857 case 'h':
1858 set_mode(vc, 1);
1859 return;
1860 case 'l':
1861 set_mode(vc, 0);
1862 return;
1863 case 'c':
1864 if (vc->vc_ques) {
1865 if (vc->vc_par[0])
1866 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1867 else
1868 vc->vc_cursor_type = cur_default;
1869 return;
1870 }
1871 break;
1872 case 'm':
1873 if (vc->vc_ques) {
1874 clear_selection();
1875 if (vc->vc_par[0])
1876 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1877 else
1878 vc->vc_complement_mask = vc->vc_s_complement_mask;
1879 return;
1880 }
1881 break;
1882 case 'n':
1883 if (!vc->vc_ques) {
1884 if (vc->vc_par[0] == 5)
1885 status_report(tty);
1886 else if (vc->vc_par[0] == 6)
1887 cursor_report(vc, tty);
1888 }
1889 return;
1890 }
1891 if (vc->vc_ques) {
1892 vc->vc_ques = 0;
1893 return;
1894 }
1895 switch(c) {
1896 case 'G': case '`':
1897 if (vc->vc_par[0])
1898 vc->vc_par[0]--;
1899 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1900 return;
1901 case 'A':
1902 if (!vc->vc_par[0])
1903 vc->vc_par[0]++;
1904 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1905 return;
1906 case 'B': case 'e':
1907 if (!vc->vc_par[0])
1908 vc->vc_par[0]++;
1909 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1910 return;
1911 case 'C': case 'a':
1912 if (!vc->vc_par[0])
1913 vc->vc_par[0]++;
1914 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1915 return;
1916 case 'D':
1917 if (!vc->vc_par[0])
1918 vc->vc_par[0]++;
1919 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1920 return;
1921 case 'E':
1922 if (!vc->vc_par[0])
1923 vc->vc_par[0]++;
1924 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1925 return;
1926 case 'F':
1927 if (!vc->vc_par[0])
1928 vc->vc_par[0]++;
1929 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1930 return;
1931 case 'd':
1932 if (vc->vc_par[0])
1933 vc->vc_par[0]--;
1934 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1935 return;
1936 case 'H': case 'f':
1937 if (vc->vc_par[0])
1938 vc->vc_par[0]--;
1939 if (vc->vc_par[1])
1940 vc->vc_par[1]--;
1941 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1942 return;
1943 case 'J':
1944 csi_J(vc, vc->vc_par[0]);
1945 return;
1946 case 'K':
1947 csi_K(vc, vc->vc_par[0]);
1948 return;
1949 case 'L':
1950 csi_L(vc, vc->vc_par[0]);
1951 return;
1952 case 'M':
1953 csi_M(vc, vc->vc_par[0]);
1954 return;
1955 case 'P':
1956 csi_P(vc, vc->vc_par[0]);
1957 return;
1958 case 'c':
1959 if (!vc->vc_par[0])
1960 respond_ID(tty);
1961 return;
1962 case 'g':
1963 if (!vc->vc_par[0])
1964 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1965 else if (vc->vc_par[0] == 3) {
1966 vc->vc_tab_stop[0] =
1967 vc->vc_tab_stop[1] =
1968 vc->vc_tab_stop[2] =
1969 vc->vc_tab_stop[3] =
1970 vc->vc_tab_stop[4] =
1971 vc->vc_tab_stop[5] =
1972 vc->vc_tab_stop[6] =
1973 vc->vc_tab_stop[7] = 0;
1974 }
1975 return;
1976 case 'm':
1977 csi_m(vc);
1978 return;
1979 case 'q': /* DECLL - but only 3 leds */
1980 /* map 0,1,2,3 to 0,1,2,4 */
1981 if (vc->vc_par[0] < 4)
1982 setledstate(kbd_table + vc->vc_num,
1983 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1984 return;
1985 case 'r':
1986 if (!vc->vc_par[0])
1987 vc->vc_par[0]++;
1988 if (!vc->vc_par[1])
1989 vc->vc_par[1] = vc->vc_rows;
1990 /* Minimum allowed region is 2 lines */
1991 if (vc->vc_par[0] < vc->vc_par[1] &&
1992 vc->vc_par[1] <= vc->vc_rows) {
1993 vc->vc_top = vc->vc_par[0] - 1;
1994 vc->vc_bottom = vc->vc_par[1];
1995 gotoxay(vc, 0, 0);
1996 }
1997 return;
1998 case 's':
1999 save_cur(vc);
2000 return;
2001 case 'u':
2002 restore_cur(vc);
2003 return;
2004 case 'X':
2005 csi_X(vc, vc->vc_par[0]);
2006 return;
2007 case '@':
2008 csi_at(vc, vc->vc_par[0]);
2009 return;
2010 case ']': /* setterm functions */
2011 setterm_command(vc);
2012 return;
2013 }
2014 return;
2015 case ESpercent:
2016 vc->vc_state = ESnormal;
2017 switch (c) {
2018 case '@': /* defined in ISO 2022 */
2019 vc->vc_utf = 0;
2020 return;
2021 case 'G': /* prelim official escape code */
2022 case '8': /* retained for compatibility */
2023 vc->vc_utf = 1;
2024 return;
2025 }
2026 return;
2027 case ESfunckey:
2028 vc->vc_state = ESnormal;
2029 return;
2030 case EShash:
2031 vc->vc_state = ESnormal;
2032 if (c == '8') {
2033 /* DEC screen alignment test. kludge :-) */
2034 vc->vc_video_erase_char =
2035 (vc->vc_video_erase_char & 0xff00) | 'E';
2036 csi_J(vc, 2);
2037 vc->vc_video_erase_char =
2038 (vc->vc_video_erase_char & 0xff00) | ' ';
2039 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2040 }
2041 return;
2042 case ESsetG0:
2043 if (c == '0')
2044 vc->vc_G0_charset = GRAF_MAP;
2045 else if (c == 'B')
2046 vc->vc_G0_charset = LAT1_MAP;
2047 else if (c == 'U')
2048 vc->vc_G0_charset = IBMPC_MAP;
2049 else if (c == 'K')
2050 vc->vc_G0_charset = USER_MAP;
2051 if (vc->vc_charset == 0)
2052 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2053 vc->vc_state = ESnormal;
2054 return;
2055 case ESsetG1:
2056 if (c == '0')
2057 vc->vc_G1_charset = GRAF_MAP;
2058 else if (c == 'B')
2059 vc->vc_G1_charset = LAT1_MAP;
2060 else if (c == 'U')
2061 vc->vc_G1_charset = IBMPC_MAP;
2062 else if (c == 'K')
2063 vc->vc_G1_charset = USER_MAP;
2064 if (vc->vc_charset == 1)
2065 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2066 vc->vc_state = ESnormal;
2067 return;
2068 default:
2069 vc->vc_state = ESnormal;
2070 }
2071}
2072
2073/* is_double_width() is based on the wcwidth() implementation by
2074 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2075 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2076 */
2077struct interval {
2078 uint32_t first;
2079 uint32_t last;
2080};
2081
2082static int bisearch(uint32_t ucs, const struct interval *table, int max)
2083{
2084 int min = 0;
2085 int mid;
2086
2087 if (ucs < table[0].first || ucs > table[max].last)
2088 return 0;
2089 while (max >= min) {
2090 mid = (min + max) / 2;
2091 if (ucs > table[mid].last)
2092 min = mid + 1;
2093 else if (ucs < table[mid].first)
2094 max = mid - 1;
2095 else
2096 return 1;
2097 }
2098 return 0;
2099}
2100
2101static int is_double_width(uint32_t ucs)
2102{
2103 static const struct interval double_width[] = {
2104 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2105 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2106 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2107 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2108 };
2109 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2110}
2111
2112/* acquires console_lock */
2113static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2114{
2115#ifdef VT_BUF_VRAM_ONLY
2116#define FLUSH do { } while(0);
2117#else
2118#define FLUSH if (draw_x >= 0) { \
2119 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2120 draw_x = -1; \
2121 }
2122#endif
2123
2124 int c, tc, ok, n = 0, draw_x = -1;
2125 unsigned int currcons;
2126 unsigned long draw_from = 0, draw_to = 0;
2127 struct vc_data *vc;
2128 unsigned char vc_attr;
2129 struct vt_notifier_param param;
2130 uint8_t rescan;
2131 uint8_t inverse;
2132 uint8_t width;
2133 u16 himask, charmask;
2134
2135 if (in_interrupt())
2136 return count;
2137
2138 might_sleep();
2139
2140 console_lock();
2141 vc = tty->driver_data;
2142 if (vc == NULL) {
2143 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2144 console_unlock();
2145 return 0;
2146 }
2147
2148 currcons = vc->vc_num;
2149 if (!vc_cons_allocated(currcons)) {
2150 /* could this happen? */
2151 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2152 console_unlock();
2153 return 0;
2154 }
2155
2156 himask = vc->vc_hi_font_mask;
2157 charmask = himask ? 0x1ff : 0xff;
2158
2159 /* undraw cursor first */
2160 if (IS_FG(vc))
2161 hide_cursor(vc);
2162
2163 param.vc = vc;
2164
2165 while (!tty->stopped && count) {
2166 int orig = *buf;
2167 c = orig;
2168 buf++;
2169 n++;
2170 count--;
2171 rescan = 0;
2172 inverse = 0;
2173 width = 1;
2174
2175 /* Do no translation at all in control states */
2176 if (vc->vc_state != ESnormal) {
2177 tc = c;
2178 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2179 /* Combine UTF-8 into Unicode in vc_utf_char.
2180 * vc_utf_count is the number of continuation bytes still
2181 * expected to arrive.
2182 * vc_npar is the number of continuation bytes arrived so
2183 * far
2184 */
2185rescan_last_byte:
2186 if ((c & 0xc0) == 0x80) {
2187 /* Continuation byte received */
2188 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2189 if (vc->vc_utf_count) {
2190 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2191 vc->vc_npar++;
2192 if (--vc->vc_utf_count) {
2193 /* Still need some bytes */
2194 continue;
2195 }
2196 /* Got a whole character */
2197 c = vc->vc_utf_char;
2198 /* Reject overlong sequences */
2199 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2200 c > utf8_length_changes[vc->vc_npar])
2201 c = 0xfffd;
2202 } else {
2203 /* Unexpected continuation byte */
2204 vc->vc_utf_count = 0;
2205 c = 0xfffd;
2206 }
2207 } else {
2208 /* Single ASCII byte or first byte of a sequence received */
2209 if (vc->vc_utf_count) {
2210 /* Continuation byte expected */
2211 rescan = 1;
2212 vc->vc_utf_count = 0;
2213 c = 0xfffd;
2214 } else if (c > 0x7f) {
2215 /* First byte of a multibyte sequence received */
2216 vc->vc_npar = 0;
2217 if ((c & 0xe0) == 0xc0) {
2218 vc->vc_utf_count = 1;
2219 vc->vc_utf_char = (c & 0x1f);
2220 } else if ((c & 0xf0) == 0xe0) {
2221 vc->vc_utf_count = 2;
2222 vc->vc_utf_char = (c & 0x0f);
2223 } else if ((c & 0xf8) == 0xf0) {
2224 vc->vc_utf_count = 3;
2225 vc->vc_utf_char = (c & 0x07);
2226 } else if ((c & 0xfc) == 0xf8) {
2227 vc->vc_utf_count = 4;
2228 vc->vc_utf_char = (c & 0x03);
2229 } else if ((c & 0xfe) == 0xfc) {
2230 vc->vc_utf_count = 5;
2231 vc->vc_utf_char = (c & 0x01);
2232 } else {
2233 /* 254 and 255 are invalid */
2234 c = 0xfffd;
2235 }
2236 if (vc->vc_utf_count) {
2237 /* Still need some bytes */
2238 continue;
2239 }
2240 }
2241 /* Nothing to do if an ASCII byte was received */
2242 }
2243 /* End of UTF-8 decoding. */
2244 /* c is the received character, or U+FFFD for invalid sequences. */
2245 /* Replace invalid Unicode code points with U+FFFD too */
2246 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2247 c = 0xfffd;
2248 tc = c;
2249 } else { /* no utf or alternate charset mode */
2250 tc = vc_translate(vc, c);
2251 }
2252
2253 param.c = tc;
2254 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2255 ¶m) == NOTIFY_STOP)
2256 continue;
2257
2258 /* If the original code was a control character we
2259 * only allow a glyph to be displayed if the code is
2260 * not normally used (such as for cursor movement) or
2261 * if the disp_ctrl mode has been explicitly enabled.
2262 * Certain characters (as given by the CTRL_ALWAYS
2263 * bitmap) are always displayed as control characters,
2264 * as the console would be pretty useless without
2265 * them; to display an arbitrary font position use the
2266 * direct-to-font zone in UTF-8 mode.
2267 */
2268 ok = tc && (c >= 32 ||
2269 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2270 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2271 && (c != 127 || vc->vc_disp_ctrl)
2272 && (c != 128+27);
2273
2274 if (vc->vc_state == ESnormal && ok) {
2275 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2276 if (is_double_width(c))
2277 width = 2;
2278 }
2279 /* Now try to find out how to display it */
2280 tc = conv_uni_to_pc(vc, tc);
2281 if (tc & ~charmask) {
2282 if (tc == -1 || tc == -2) {
2283 continue; /* nothing to display */
2284 }
2285 /* Glyph not found */
2286 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2287 /* In legacy mode use the glyph we get by a 1:1 mapping.
2288 This would make absolutely no sense with Unicode in mind,
2289 but do this for ASCII characters since a font may lack
2290 Unicode mapping info and we don't want to end up with
2291 having question marks only. */
2292 tc = c;
2293 } else {
2294 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2295 tc = conv_uni_to_pc(vc, 0xfffd);
2296 if (tc < 0) {
2297 inverse = 1;
2298 tc = conv_uni_to_pc(vc, '?');
2299 if (tc < 0) tc = '?';
2300 }
2301 }
2302 }
2303
2304 if (!inverse) {
2305 vc_attr = vc->vc_attr;
2306 } else {
2307 /* invert vc_attr */
2308 if (!vc->vc_can_do_color) {
2309 vc_attr = (vc->vc_attr) ^ 0x08;
2310 } else if (vc->vc_hi_font_mask == 0x100) {
2311 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2312 } else {
2313 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2314 }
2315 FLUSH
2316 }
2317
2318 while (1) {
2319 if (vc->vc_need_wrap || vc->vc_decim)
2320 FLUSH
2321 if (vc->vc_need_wrap) {
2322 cr(vc);
2323 lf(vc);
2324 }
2325 if (vc->vc_decim)
2326 insert_char(vc, 1);
2327 scr_writew(himask ?
2328 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2329 (vc_attr << 8) + tc,
2330 (u16 *) vc->vc_pos);
2331 if (DO_UPDATE(vc) && draw_x < 0) {
2332 draw_x = vc->vc_x;
2333 draw_from = vc->vc_pos;
2334 }
2335 if (vc->vc_x == vc->vc_cols - 1) {
2336 vc->vc_need_wrap = vc->vc_decawm;
2337 draw_to = vc->vc_pos + 2;
2338 } else {
2339 vc->vc_x++;
2340 draw_to = (vc->vc_pos += 2);
2341 }
2342
2343 if (!--width) break;
2344
2345 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2346 if (tc < 0) tc = ' ';
2347 }
2348 notify_write(vc, c);
2349
2350 if (inverse) {
2351 FLUSH
2352 }
2353
2354 if (rescan) {
2355 rescan = 0;
2356 inverse = 0;
2357 width = 1;
2358 c = orig;
2359 goto rescan_last_byte;
2360 }
2361 continue;
2362 }
2363 FLUSH
2364 do_con_trol(tty, vc, orig);
2365 }
2366 FLUSH
2367 console_conditional_schedule();
2368 console_unlock();
2369 notify_update(vc);
2370 return n;
2371#undef FLUSH
2372}
2373
2374/*
2375 * This is the console switching callback.
2376 *
2377 * Doing console switching in a process context allows
2378 * us to do the switches asynchronously (needed when we want
2379 * to switch due to a keyboard interrupt). Synchronization
2380 * with other console code and prevention of re-entrancy is
2381 * ensured with console_lock.
2382 */
2383static void console_callback(struct work_struct *ignored)
2384{
2385 console_lock();
2386
2387 if (want_console >= 0) {
2388 if (want_console != fg_console &&
2389 vc_cons_allocated(want_console)) {
2390 hide_cursor(vc_cons[fg_console].d);
2391 change_console(vc_cons[want_console].d);
2392 /* we only changed when the console had already
2393 been allocated - a new console is not created
2394 in an interrupt routine */
2395 }
2396 want_console = -1;
2397 }
2398 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2399 do_poke_blanked_console = 0;
2400 poke_blanked_console();
2401 }
2402 if (scrollback_delta) {
2403 struct vc_data *vc = vc_cons[fg_console].d;
2404 clear_selection();
2405 if (vc->vc_mode == KD_TEXT)
2406 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2407 scrollback_delta = 0;
2408 }
2409 if (blank_timer_expired) {
2410 do_blank_screen(0);
2411 blank_timer_expired = 0;
2412 }
2413 notify_update(vc_cons[fg_console].d);
2414
2415 console_unlock();
2416}
2417
2418int set_console(int nr)
2419{
2420 struct vc_data *vc = vc_cons[fg_console].d;
2421
2422 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2423 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2424
2425 /*
2426 * Console switch will fail in console_callback() or
2427 * change_console() so there is no point scheduling
2428 * the callback
2429 *
2430 * Existing set_console() users don't check the return
2431 * value so this shouldn't break anything
2432 */
2433 return -EINVAL;
2434 }
2435
2436 want_console = nr;
2437 schedule_console_callback();
2438
2439 return 0;
2440}
2441
2442struct tty_driver *console_driver;
2443
2444#ifdef CONFIG_VT_CONSOLE
2445
2446/**
2447 * vt_kmsg_redirect() - Sets/gets the kernel message console
2448 * @new: The new virtual terminal number or -1 if the console should stay
2449 * unchanged
2450 *
2451 * By default, the kernel messages are always printed on the current virtual
2452 * console. However, the user may modify that default with the
2453 * TIOCL_SETKMSGREDIRECT ioctl call.
2454 *
2455 * This function sets the kernel message console to be @new. It returns the old
2456 * virtual console number. The virtual terminal number 0 (both as parameter and
2457 * return value) means no redirection (i.e. always printed on the currently
2458 * active console).
2459 *
2460 * The parameter -1 means that only the current console is returned, but the
2461 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2462 * case to make the code more understandable.
2463 *
2464 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2465 * the parameter and always returns 0.
2466 */
2467int vt_kmsg_redirect(int new)
2468{
2469 static int kmsg_con;
2470
2471 if (new != -1)
2472 return xchg(&kmsg_con, new);
2473 else
2474 return kmsg_con;
2475}
2476
2477/*
2478 * Console on virtual terminal
2479 *
2480 * The console must be locked when we get here.
2481 */
2482
2483static void vt_console_print(struct console *co, const char *b, unsigned count)
2484{
2485 struct vc_data *vc = vc_cons[fg_console].d;
2486 unsigned char c;
2487 static DEFINE_SPINLOCK(printing_lock);
2488 const ushort *start;
2489 ushort cnt = 0;
2490 ushort myx;
2491 int kmsg_console;
2492
2493 /* console busy or not yet initialized */
2494 if (!printable)
2495 return;
2496 if (!spin_trylock(&printing_lock))
2497 return;
2498
2499 kmsg_console = vt_get_kmsg_redirect();
2500 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2501 vc = vc_cons[kmsg_console - 1].d;
2502
2503 /* read `x' only after setting currcons properly (otherwise
2504 the `x' macro will read the x of the foreground console). */
2505 myx = vc->vc_x;
2506
2507 if (!vc_cons_allocated(fg_console)) {
2508 /* impossible */
2509 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2510 goto quit;
2511 }
2512
2513 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2514 goto quit;
2515
2516 /* undraw cursor first */
2517 if (IS_FG(vc))
2518 hide_cursor(vc);
2519
2520 start = (ushort *)vc->vc_pos;
2521
2522 /* Contrived structure to try to emulate original need_wrap behaviour
2523 * Problems caused when we have need_wrap set on '\n' character */
2524 while (count--) {
2525 c = *b++;
2526 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2527 if (cnt > 0) {
2528 if (CON_IS_VISIBLE(vc))
2529 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2530 vc->vc_x += cnt;
2531 if (vc->vc_need_wrap)
2532 vc->vc_x--;
2533 cnt = 0;
2534 }
2535 if (c == 8) { /* backspace */
2536 bs(vc);
2537 start = (ushort *)vc->vc_pos;
2538 myx = vc->vc_x;
2539 continue;
2540 }
2541 if (c != 13)
2542 lf(vc);
2543 cr(vc);
2544 start = (ushort *)vc->vc_pos;
2545 myx = vc->vc_x;
2546 if (c == 10 || c == 13)
2547 continue;
2548 }
2549 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2550 notify_write(vc, c);
2551 cnt++;
2552 if (myx == vc->vc_cols - 1) {
2553 vc->vc_need_wrap = 1;
2554 continue;
2555 }
2556 vc->vc_pos += 2;
2557 myx++;
2558 }
2559 if (cnt > 0) {
2560 if (CON_IS_VISIBLE(vc))
2561 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2562 vc->vc_x += cnt;
2563 if (vc->vc_x == vc->vc_cols) {
2564 vc->vc_x--;
2565 vc->vc_need_wrap = 1;
2566 }
2567 }
2568 set_cursor(vc);
2569 notify_update(vc);
2570
2571quit:
2572 spin_unlock(&printing_lock);
2573}
2574
2575static struct tty_driver *vt_console_device(struct console *c, int *index)
2576{
2577 *index = c->index ? c->index-1 : fg_console;
2578 return console_driver;
2579}
2580
2581static struct console vt_console_driver = {
2582 .name = "tty",
2583 .write = vt_console_print,
2584 .device = vt_console_device,
2585 .unblank = unblank_screen,
2586 .flags = CON_PRINTBUFFER,
2587 .index = -1,
2588};
2589#endif
2590
2591/*
2592 * Handling of Linux-specific VC ioctls
2593 */
2594
2595/*
2596 * Generally a bit racy with respect to console_lock();.
2597 *
2598 * There are some functions which don't need it.
2599 *
2600 * There are some functions which can sleep for arbitrary periods
2601 * (paste_selection) but we don't need the lock there anyway.
2602 *
2603 * set_selection has locking, and definitely needs it
2604 */
2605
2606int tioclinux(struct tty_struct *tty, unsigned long arg)
2607{
2608 char type, data;
2609 char __user *p = (char __user *)arg;
2610 int lines;
2611 int ret;
2612
2613 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2614 return -EPERM;
2615 if (get_user(type, p))
2616 return -EFAULT;
2617 ret = 0;
2618
2619 switch (type)
2620 {
2621 case TIOCL_SETSEL:
2622 console_lock();
2623 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2624 console_unlock();
2625 break;
2626 case TIOCL_PASTESEL:
2627 ret = paste_selection(tty);
2628 break;
2629 case TIOCL_UNBLANKSCREEN:
2630 console_lock();
2631 unblank_screen();
2632 console_unlock();
2633 break;
2634 case TIOCL_SELLOADLUT:
2635 ret = sel_loadlut(p);
2636 break;
2637 case TIOCL_GETSHIFTSTATE:
2638
2639 /*
2640 * Make it possible to react to Shift+Mousebutton.
2641 * Note that 'shift_state' is an undocumented
2642 * kernel-internal variable; programs not closely
2643 * related to the kernel should not use this.
2644 */
2645 data = shift_state;
2646 ret = __put_user(data, p);
2647 break;
2648 case TIOCL_GETMOUSEREPORTING:
2649 data = mouse_reporting();
2650 ret = __put_user(data, p);
2651 break;
2652 case TIOCL_SETVESABLANK:
2653 ret = set_vesa_blanking(p);
2654 break;
2655 case TIOCL_GETKMSGREDIRECT:
2656 data = vt_get_kmsg_redirect();
2657 ret = __put_user(data, p);
2658 break;
2659 case TIOCL_SETKMSGREDIRECT:
2660 if (!capable(CAP_SYS_ADMIN)) {
2661 ret = -EPERM;
2662 } else {
2663 if (get_user(data, p+1))
2664 ret = -EFAULT;
2665 else
2666 vt_kmsg_redirect(data);
2667 }
2668 break;
2669 case TIOCL_GETFGCONSOLE:
2670 ret = fg_console;
2671 break;
2672 case TIOCL_SCROLLCONSOLE:
2673 if (get_user(lines, (s32 __user *)(p+4))) {
2674 ret = -EFAULT;
2675 } else {
2676 scrollfront(vc_cons[fg_console].d, lines);
2677 ret = 0;
2678 }
2679 break;
2680 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2681 console_lock();
2682 ignore_poke = 1;
2683 do_blank_screen(0);
2684 console_unlock();
2685 break;
2686 case TIOCL_BLANKEDSCREEN:
2687 ret = console_blanked;
2688 break;
2689 default:
2690 ret = -EINVAL;
2691 break;
2692 }
2693 return ret;
2694}
2695
2696/*
2697 * /dev/ttyN handling
2698 */
2699
2700static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2701{
2702 int retval;
2703
2704 retval = do_con_write(tty, buf, count);
2705 con_flush_chars(tty);
2706
2707 return retval;
2708}
2709
2710static int con_put_char(struct tty_struct *tty, unsigned char ch)
2711{
2712 if (in_interrupt())
2713 return 0; /* n_r3964 calls put_char() from interrupt context */
2714 return do_con_write(tty, &ch, 1);
2715}
2716
2717static int con_write_room(struct tty_struct *tty)
2718{
2719 if (tty->stopped)
2720 return 0;
2721 return 32768; /* No limit, really; we're not buffering */
2722}
2723
2724static int con_chars_in_buffer(struct tty_struct *tty)
2725{
2726 return 0; /* we're not buffering */
2727}
2728
2729/*
2730 * con_throttle and con_unthrottle are only used for
2731 * paste_selection(), which has to stuff in a large number of
2732 * characters...
2733 */
2734static void con_throttle(struct tty_struct *tty)
2735{
2736}
2737
2738static void con_unthrottle(struct tty_struct *tty)
2739{
2740 struct vc_data *vc = tty->driver_data;
2741
2742 wake_up_interruptible(&vc->paste_wait);
2743}
2744
2745/*
2746 * Turn the Scroll-Lock LED on when the tty is stopped
2747 */
2748static void con_stop(struct tty_struct *tty)
2749{
2750 int console_num;
2751 if (!tty)
2752 return;
2753 console_num = tty->index;
2754 if (!vc_cons_allocated(console_num))
2755 return;
2756 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2757 set_leds();
2758}
2759
2760/*
2761 * Turn the Scroll-Lock LED off when the console is started
2762 */
2763static void con_start(struct tty_struct *tty)
2764{
2765 int console_num;
2766 if (!tty)
2767 return;
2768 console_num = tty->index;
2769 if (!vc_cons_allocated(console_num))
2770 return;
2771 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2772 set_leds();
2773}
2774
2775static void con_flush_chars(struct tty_struct *tty)
2776{
2777 struct vc_data *vc;
2778
2779 if (in_interrupt()) /* from flush_to_ldisc */
2780 return;
2781
2782 /* if we race with con_close(), vt may be null */
2783 console_lock();
2784 vc = tty->driver_data;
2785 if (vc)
2786 set_cursor(vc);
2787 console_unlock();
2788}
2789
2790/*
2791 * Allocate the console screen memory.
2792 */
2793static int con_open(struct tty_struct *tty, struct file *filp)
2794{
2795 unsigned int currcons = tty->index;
2796 int ret = 0;
2797
2798 console_lock();
2799 if (tty->driver_data == NULL) {
2800 ret = vc_allocate(currcons);
2801 if (ret == 0) {
2802 struct vc_data *vc = vc_cons[currcons].d;
2803
2804 /* Still being freed */
2805 if (vc->port.tty) {
2806 console_unlock();
2807 return -ERESTARTSYS;
2808 }
2809 tty->driver_data = vc;
2810 vc->port.tty = tty;
2811
2812 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2813 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2814 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2815 }
2816 if (vc->vc_utf)
2817 tty->termios->c_iflag |= IUTF8;
2818 else
2819 tty->termios->c_iflag &= ~IUTF8;
2820 console_unlock();
2821 return ret;
2822 }
2823 }
2824 console_unlock();
2825 return ret;
2826}
2827
2828static void con_close(struct tty_struct *tty, struct file *filp)
2829{
2830 /* Nothing to do - we defer to shutdown */
2831}
2832
2833static void con_shutdown(struct tty_struct *tty)
2834{
2835 struct vc_data *vc = tty->driver_data;
2836 BUG_ON(vc == NULL);
2837 console_lock();
2838 vc->port.tty = NULL;
2839 console_unlock();
2840 tty_shutdown(tty);
2841}
2842
2843static int default_italic_color = 2; // green (ASCII)
2844static int default_underline_color = 3; // cyan (ASCII)
2845module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2846module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2847
2848static void vc_init(struct vc_data *vc, unsigned int rows,
2849 unsigned int cols, int do_clear)
2850{
2851 int j, k ;
2852
2853 vc->vc_cols = cols;
2854 vc->vc_rows = rows;
2855 vc->vc_size_row = cols << 1;
2856 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2857
2858 set_origin(vc);
2859 vc->vc_pos = vc->vc_origin;
2860 reset_vc(vc);
2861 for (j=k=0; j<16; j++) {
2862 vc->vc_palette[k++] = default_red[j] ;
2863 vc->vc_palette[k++] = default_grn[j] ;
2864 vc->vc_palette[k++] = default_blu[j] ;
2865 }
2866 vc->vc_def_color = 0x07; /* white */
2867 vc->vc_ulcolor = default_underline_color;
2868 vc->vc_itcolor = default_italic_color;
2869 vc->vc_halfcolor = 0x08; /* grey */
2870 init_waitqueue_head(&vc->paste_wait);
2871 reset_terminal(vc, do_clear);
2872}
2873
2874/*
2875 * This routine initializes console interrupts, and does nothing
2876 * else. If you want the screen to clear, call tty_write with
2877 * the appropriate escape-sequence.
2878 */
2879
2880static int __init con_init(void)
2881{
2882 const char *display_desc = NULL;
2883 struct vc_data *vc;
2884 unsigned int currcons = 0, i;
2885
2886 console_lock();
2887
2888 if (conswitchp)
2889 display_desc = conswitchp->con_startup();
2890 if (!display_desc) {
2891 fg_console = 0;
2892 console_unlock();
2893 return 0;
2894 }
2895
2896 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2897 struct con_driver *con_driver = ®istered_con_driver[i];
2898
2899 if (con_driver->con == NULL) {
2900 con_driver->con = conswitchp;
2901 con_driver->desc = display_desc;
2902 con_driver->flag = CON_DRIVER_FLAG_INIT;
2903 con_driver->first = 0;
2904 con_driver->last = MAX_NR_CONSOLES - 1;
2905 break;
2906 }
2907 }
2908
2909 for (i = 0; i < MAX_NR_CONSOLES; i++)
2910 con_driver_map[i] = conswitchp;
2911
2912 if (blankinterval) {
2913 blank_state = blank_normal_wait;
2914 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2915 }
2916
2917 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2918 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2919 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2920 tty_port_init(&vc->port);
2921 visual_init(vc, currcons, 1);
2922 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2923 vc_init(vc, vc->vc_rows, vc->vc_cols,
2924 currcons || !vc->vc_sw->con_save_screen);
2925 }
2926 currcons = fg_console = 0;
2927 master_display_fg = vc = vc_cons[currcons].d;
2928 set_origin(vc);
2929 save_screen(vc);
2930 gotoxy(vc, vc->vc_x, vc->vc_y);
2931 csi_J(vc, 0);
2932 update_screen(vc);
2933 pr_info("Console: %s %s %dx%d",
2934 vc->vc_can_do_color ? "colour" : "mono",
2935 display_desc, vc->vc_cols, vc->vc_rows);
2936 printable = 1;
2937 printk("\n");
2938
2939 console_unlock();
2940
2941#ifdef CONFIG_VT_CONSOLE
2942 register_console(&vt_console_driver);
2943#endif
2944 return 0;
2945}
2946console_initcall(con_init);
2947
2948static const struct tty_operations con_ops = {
2949 .open = con_open,
2950 .close = con_close,
2951 .write = con_write,
2952 .write_room = con_write_room,
2953 .put_char = con_put_char,
2954 .flush_chars = con_flush_chars,
2955 .chars_in_buffer = con_chars_in_buffer,
2956 .ioctl = vt_ioctl,
2957#ifdef CONFIG_COMPAT
2958 .compat_ioctl = vt_compat_ioctl,
2959#endif
2960 .stop = con_stop,
2961 .start = con_start,
2962 .throttle = con_throttle,
2963 .unthrottle = con_unthrottle,
2964 .resize = vt_resize,
2965 .shutdown = con_shutdown
2966};
2967
2968static struct cdev vc0_cdev;
2969
2970static ssize_t show_tty_active(struct device *dev,
2971 struct device_attribute *attr, char *buf)
2972{
2973 return sprintf(buf, "tty%d\n", fg_console + 1);
2974}
2975static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2976
2977int __init vty_init(const struct file_operations *console_fops)
2978{
2979 cdev_init(&vc0_cdev, console_fops);
2980 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2981 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2982 panic("Couldn't register /dev/tty0 driver\n");
2983 tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2984 if (IS_ERR(tty0dev))
2985 tty0dev = NULL;
2986 else
2987 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2988
2989 vcs_init();
2990
2991 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2992 if (!console_driver)
2993 panic("Couldn't allocate console driver\n");
2994 console_driver->owner = THIS_MODULE;
2995 console_driver->name = "tty";
2996 console_driver->name_base = 1;
2997 console_driver->major = TTY_MAJOR;
2998 console_driver->minor_start = 1;
2999 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3000 console_driver->init_termios = tty_std_termios;
3001 if (default_utf8)
3002 console_driver->init_termios.c_iflag |= IUTF8;
3003 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3004 tty_set_operations(console_driver, &con_ops);
3005 if (tty_register_driver(console_driver))
3006 panic("Couldn't register console driver\n");
3007 kbd_init();
3008 console_map_init();
3009#ifdef CONFIG_MDA_CONSOLE
3010 mda_console_init();
3011#endif
3012 return 0;
3013}
3014
3015#ifndef VT_SINGLE_DRIVER
3016
3017static struct class *vtconsole_class;
3018
3019static int bind_con_driver(const struct consw *csw, int first, int last,
3020 int deflt)
3021{
3022 struct module *owner = csw->owner;
3023 const char *desc = NULL;
3024 struct con_driver *con_driver;
3025 int i, j = -1, k = -1, retval = -ENODEV;
3026
3027 if (!try_module_get(owner))
3028 return -ENODEV;
3029
3030 console_lock();
3031
3032 /* check if driver is registered */
3033 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3034 con_driver = ®istered_con_driver[i];
3035
3036 if (con_driver->con == csw) {
3037 desc = con_driver->desc;
3038 retval = 0;
3039 break;
3040 }
3041 }
3042
3043 if (retval)
3044 goto err;
3045
3046 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3047 csw->con_startup();
3048 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3049 }
3050
3051 if (deflt) {
3052 if (conswitchp)
3053 module_put(conswitchp->owner);
3054
3055 __module_get(owner);
3056 conswitchp = csw;
3057 }
3058
3059 first = max(first, con_driver->first);
3060 last = min(last, con_driver->last);
3061
3062 for (i = first; i <= last; i++) {
3063 int old_was_color;
3064 struct vc_data *vc = vc_cons[i].d;
3065
3066 if (con_driver_map[i])
3067 module_put(con_driver_map[i]->owner);
3068 __module_get(owner);
3069 con_driver_map[i] = csw;
3070
3071 if (!vc || !vc->vc_sw)
3072 continue;
3073
3074 j = i;
3075
3076 if (CON_IS_VISIBLE(vc)) {
3077 k = i;
3078 save_screen(vc);
3079 }
3080
3081 old_was_color = vc->vc_can_do_color;
3082 vc->vc_sw->con_deinit(vc);
3083 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3084 visual_init(vc, i, 0);
3085 set_origin(vc);
3086 update_attr(vc);
3087
3088 /* If the console changed between mono <-> color, then
3089 * the attributes in the screenbuf will be wrong. The
3090 * following resets all attributes to something sane.
3091 */
3092 if (old_was_color != vc->vc_can_do_color)
3093 clear_buffer_attributes(vc);
3094 }
3095
3096 pr_info("Console: switching ");
3097 if (!deflt)
3098 printk("consoles %d-%d ", first+1, last+1);
3099 if (j >= 0) {
3100 struct vc_data *vc = vc_cons[j].d;
3101
3102 printk("to %s %s %dx%d\n",
3103 vc->vc_can_do_color ? "colour" : "mono",
3104 desc, vc->vc_cols, vc->vc_rows);
3105
3106 if (k >= 0) {
3107 vc = vc_cons[k].d;
3108 update_screen(vc);
3109 }
3110 } else
3111 printk("to %s\n", desc);
3112
3113 retval = 0;
3114err:
3115 console_unlock();
3116 module_put(owner);
3117 return retval;
3118};
3119
3120#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3121static int con_is_graphics(const struct consw *csw, int first, int last)
3122{
3123 int i, retval = 0;
3124
3125 for (i = first; i <= last; i++) {
3126 struct vc_data *vc = vc_cons[i].d;
3127
3128 if (vc && vc->vc_mode == KD_GRAPHICS) {
3129 retval = 1;
3130 break;
3131 }
3132 }
3133
3134 return retval;
3135}
3136
3137/**
3138 * unbind_con_driver - unbind a console driver
3139 * @csw: pointer to console driver to unregister
3140 * @first: first in range of consoles that @csw should be unbound from
3141 * @last: last in range of consoles that @csw should be unbound from
3142 * @deflt: should next bound console driver be default after @csw is unbound?
3143 *
3144 * To unbind a driver from all possible consoles, pass 0 as @first and
3145 * %MAX_NR_CONSOLES as @last.
3146 *
3147 * @deflt controls whether the console that ends up replacing @csw should be
3148 * the default console.
3149 *
3150 * RETURNS:
3151 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3152 * or 0 on success.
3153 */
3154int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3155{
3156 struct module *owner = csw->owner;
3157 const struct consw *defcsw = NULL;
3158 struct con_driver *con_driver = NULL, *con_back = NULL;
3159 int i, retval = -ENODEV;
3160
3161 if (!try_module_get(owner))
3162 return -ENODEV;
3163
3164 console_lock();
3165
3166 /* check if driver is registered and if it is unbindable */
3167 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3168 con_driver = ®istered_con_driver[i];
3169
3170 if (con_driver->con == csw &&
3171 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3172 retval = 0;
3173 break;
3174 }
3175 }
3176
3177 if (retval) {
3178 console_unlock();
3179 goto err;
3180 }
3181
3182 retval = -ENODEV;
3183
3184 /* check if backup driver exists */
3185 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3186 con_back = ®istered_con_driver[i];
3187
3188 if (con_back->con &&
3189 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3190 defcsw = con_back->con;
3191 retval = 0;
3192 break;
3193 }
3194 }
3195
3196 if (retval) {
3197 console_unlock();
3198 goto err;
3199 }
3200
3201 if (!con_is_bound(csw)) {
3202 console_unlock();
3203 goto err;
3204 }
3205
3206 first = max(first, con_driver->first);
3207 last = min(last, con_driver->last);
3208
3209 for (i = first; i <= last; i++) {
3210 if (con_driver_map[i] == csw) {
3211 module_put(csw->owner);
3212 con_driver_map[i] = NULL;
3213 }
3214 }
3215
3216 if (!con_is_bound(defcsw)) {
3217 const struct consw *defconsw = conswitchp;
3218
3219 defcsw->con_startup();
3220 con_back->flag |= CON_DRIVER_FLAG_INIT;
3221 /*
3222 * vgacon may change the default driver to point
3223 * to dummycon, we restore it here...
3224 */
3225 conswitchp = defconsw;
3226 }
3227
3228 if (!con_is_bound(csw))
3229 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3230
3231 console_unlock();
3232 /* ignore return value, binding should not fail */
3233 bind_con_driver(defcsw, first, last, deflt);
3234err:
3235 module_put(owner);
3236 return retval;
3237
3238}
3239EXPORT_SYMBOL(unbind_con_driver);
3240
3241static int vt_bind(struct con_driver *con)
3242{
3243 const struct consw *defcsw = NULL, *csw = NULL;
3244 int i, more = 1, first = -1, last = -1, deflt = 0;
3245
3246 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3247 con_is_graphics(con->con, con->first, con->last))
3248 goto err;
3249
3250 csw = con->con;
3251
3252 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3253 struct con_driver *con = ®istered_con_driver[i];
3254
3255 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3256 defcsw = con->con;
3257 break;
3258 }
3259 }
3260
3261 if (!defcsw)
3262 goto err;
3263
3264 while (more) {
3265 more = 0;
3266
3267 for (i = con->first; i <= con->last; i++) {
3268 if (con_driver_map[i] == defcsw) {
3269 if (first == -1)
3270 first = i;
3271 last = i;
3272 more = 1;
3273 } else if (first != -1)
3274 break;
3275 }
3276
3277 if (first == 0 && last == MAX_NR_CONSOLES -1)
3278 deflt = 1;
3279
3280 if (first != -1)
3281 bind_con_driver(csw, first, last, deflt);
3282
3283 first = -1;
3284 last = -1;
3285 deflt = 0;
3286 }
3287
3288err:
3289 return 0;
3290}
3291
3292static int vt_unbind(struct con_driver *con)
3293{
3294 const struct consw *csw = NULL;
3295 int i, more = 1, first = -1, last = -1, deflt = 0;
3296
3297 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3298 con_is_graphics(con->con, con->first, con->last))
3299 goto err;
3300
3301 csw = con->con;
3302
3303 while (more) {
3304 more = 0;
3305
3306 for (i = con->first; i <= con->last; i++) {
3307 if (con_driver_map[i] == csw) {
3308 if (first == -1)
3309 first = i;
3310 last = i;
3311 more = 1;
3312 } else if (first != -1)
3313 break;
3314 }
3315
3316 if (first == 0 && last == MAX_NR_CONSOLES -1)
3317 deflt = 1;
3318
3319 if (first != -1)
3320 unbind_con_driver(csw, first, last, deflt);
3321
3322 first = -1;
3323 last = -1;
3324 deflt = 0;
3325 }
3326
3327err:
3328 return 0;
3329}
3330#else
3331static inline int vt_bind(struct con_driver *con)
3332{
3333 return 0;
3334}
3335static inline int vt_unbind(struct con_driver *con)
3336{
3337 return 0;
3338}
3339#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3340
3341static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3342 const char *buf, size_t count)
3343{
3344 struct con_driver *con = dev_get_drvdata(dev);
3345 int bind = simple_strtoul(buf, NULL, 0);
3346
3347 if (bind)
3348 vt_bind(con);
3349 else
3350 vt_unbind(con);
3351
3352 return count;
3353}
3354
3355static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3356 char *buf)
3357{
3358 struct con_driver *con = dev_get_drvdata(dev);
3359 int bind = con_is_bound(con->con);
3360
3361 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3362}
3363
3364static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3365 char *buf)
3366{
3367 struct con_driver *con = dev_get_drvdata(dev);
3368
3369 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3370 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3371 con->desc);
3372
3373}
3374
3375static struct device_attribute device_attrs[] = {
3376 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3377 __ATTR(name, S_IRUGO, show_name, NULL),
3378};
3379
3380static int vtconsole_init_device(struct con_driver *con)
3381{
3382 int i;
3383 int error = 0;
3384
3385 con->flag |= CON_DRIVER_FLAG_ATTR;
3386 dev_set_drvdata(con->dev, con);
3387 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3388 error = device_create_file(con->dev, &device_attrs[i]);
3389 if (error)
3390 break;
3391 }
3392
3393 if (error) {
3394 while (--i >= 0)
3395 device_remove_file(con->dev, &device_attrs[i]);
3396 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3397 }
3398
3399 return error;
3400}
3401
3402static void vtconsole_deinit_device(struct con_driver *con)
3403{
3404 int i;
3405
3406 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3407 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3408 device_remove_file(con->dev, &device_attrs[i]);
3409 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3410 }
3411}
3412
3413/**
3414 * con_is_bound - checks if driver is bound to the console
3415 * @csw: console driver
3416 *
3417 * RETURNS: zero if unbound, nonzero if bound
3418 *
3419 * Drivers can call this and if zero, they should release
3420 * all resources allocated on con_startup()
3421 */
3422int con_is_bound(const struct consw *csw)
3423{
3424 int i, bound = 0;
3425
3426 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3427 if (con_driver_map[i] == csw) {
3428 bound = 1;
3429 break;
3430 }
3431 }
3432
3433 return bound;
3434}
3435EXPORT_SYMBOL(con_is_bound);
3436
3437/**
3438 * con_debug_enter - prepare the console for the kernel debugger
3439 * @sw: console driver
3440 *
3441 * Called when the console is taken over by the kernel debugger, this
3442 * function needs to save the current console state, then put the console
3443 * into a state suitable for the kernel debugger.
3444 *
3445 * RETURNS:
3446 * Zero on success, nonzero if a failure occurred when trying to prepare
3447 * the console for the debugger.
3448 */
3449int con_debug_enter(struct vc_data *vc)
3450{
3451 int ret = 0;
3452
3453 saved_fg_console = fg_console;
3454 saved_last_console = last_console;
3455 saved_want_console = want_console;
3456 saved_vc_mode = vc->vc_mode;
3457 saved_console_blanked = console_blanked;
3458 vc->vc_mode = KD_TEXT;
3459 console_blanked = 0;
3460 if (vc->vc_sw->con_debug_enter)
3461 ret = vc->vc_sw->con_debug_enter(vc);
3462#ifdef CONFIG_KGDB_KDB
3463 /* Set the initial LINES variable if it is not already set */
3464 if (vc->vc_rows < 999) {
3465 int linecount;
3466 char lns[4];
3467 const char *setargs[3] = {
3468 "set",
3469 "LINES",
3470 lns,
3471 };
3472 if (kdbgetintenv(setargs[0], &linecount)) {
3473 snprintf(lns, 4, "%i", vc->vc_rows);
3474 kdb_set(2, setargs);
3475 }
3476 }
3477#endif /* CONFIG_KGDB_KDB */
3478 return ret;
3479}
3480EXPORT_SYMBOL_GPL(con_debug_enter);
3481
3482/**
3483 * con_debug_leave - restore console state
3484 * @sw: console driver
3485 *
3486 * Restore the console state to what it was before the kernel debugger
3487 * was invoked.
3488 *
3489 * RETURNS:
3490 * Zero on success, nonzero if a failure occurred when trying to restore
3491 * the console.
3492 */
3493int con_debug_leave(void)
3494{
3495 struct vc_data *vc;
3496 int ret = 0;
3497
3498 fg_console = saved_fg_console;
3499 last_console = saved_last_console;
3500 want_console = saved_want_console;
3501 console_blanked = saved_console_blanked;
3502 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3503
3504 vc = vc_cons[fg_console].d;
3505 if (vc->vc_sw->con_debug_leave)
3506 ret = vc->vc_sw->con_debug_leave(vc);
3507 return ret;
3508}
3509EXPORT_SYMBOL_GPL(con_debug_leave);
3510
3511/**
3512 * register_con_driver - register console driver to console layer
3513 * @csw: console driver
3514 * @first: the first console to take over, minimum value is 0
3515 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3516 *
3517 * DESCRIPTION: This function registers a console driver which can later
3518 * bind to a range of consoles specified by @first and @last. It will
3519 * also initialize the console driver by calling con_startup().
3520 */
3521int register_con_driver(const struct consw *csw, int first, int last)
3522{
3523 struct module *owner = csw->owner;
3524 struct con_driver *con_driver;
3525 const char *desc;
3526 int i, retval = 0;
3527
3528 if (!try_module_get(owner))
3529 return -ENODEV;
3530
3531 console_lock();
3532
3533 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3534 con_driver = ®istered_con_driver[i];
3535
3536 /* already registered */
3537 if (con_driver->con == csw)
3538 retval = -EBUSY;
3539 }
3540
3541 if (retval)
3542 goto err;
3543
3544 desc = csw->con_startup();
3545
3546 if (!desc)
3547 goto err;
3548
3549 retval = -EINVAL;
3550
3551 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3552 con_driver = ®istered_con_driver[i];
3553
3554 if (con_driver->con == NULL) {
3555 con_driver->con = csw;
3556 con_driver->desc = desc;
3557 con_driver->node = i;
3558 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3559 CON_DRIVER_FLAG_INIT;
3560 con_driver->first = first;
3561 con_driver->last = last;
3562 retval = 0;
3563 break;
3564 }
3565 }
3566
3567 if (retval)
3568 goto err;
3569
3570 con_driver->dev = device_create(vtconsole_class, NULL,
3571 MKDEV(0, con_driver->node),
3572 NULL, "vtcon%i",
3573 con_driver->node);
3574
3575 if (IS_ERR(con_driver->dev)) {
3576 printk(KERN_WARNING "Unable to create device for %s; "
3577 "errno = %ld\n", con_driver->desc,
3578 PTR_ERR(con_driver->dev));
3579 con_driver->dev = NULL;
3580 } else {
3581 vtconsole_init_device(con_driver);
3582 }
3583
3584err:
3585 console_unlock();
3586 module_put(owner);
3587 return retval;
3588}
3589EXPORT_SYMBOL(register_con_driver);
3590
3591/**
3592 * unregister_con_driver - unregister console driver from console layer
3593 * @csw: console driver
3594 *
3595 * DESCRIPTION: All drivers that registers to the console layer must
3596 * call this function upon exit, or if the console driver is in a state
3597 * where it won't be able to handle console services, such as the
3598 * framebuffer console without loaded framebuffer drivers.
3599 *
3600 * The driver must unbind first prior to unregistration.
3601 */
3602int unregister_con_driver(const struct consw *csw)
3603{
3604 int i, retval = -ENODEV;
3605
3606 console_lock();
3607
3608 /* cannot unregister a bound driver */
3609 if (con_is_bound(csw))
3610 goto err;
3611
3612 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3613 struct con_driver *con_driver = ®istered_con_driver[i];
3614
3615 if (con_driver->con == csw &&
3616 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3617 vtconsole_deinit_device(con_driver);
3618 device_destroy(vtconsole_class,
3619 MKDEV(0, con_driver->node));
3620 con_driver->con = NULL;
3621 con_driver->desc = NULL;
3622 con_driver->dev = NULL;
3623 con_driver->node = 0;
3624 con_driver->flag = 0;
3625 con_driver->first = 0;
3626 con_driver->last = 0;
3627 retval = 0;
3628 break;
3629 }
3630 }
3631err:
3632 console_unlock();
3633 return retval;
3634}
3635EXPORT_SYMBOL(unregister_con_driver);
3636
3637/*
3638 * If we support more console drivers, this function is used
3639 * when a driver wants to take over some existing consoles
3640 * and become default driver for newly opened ones.
3641 *
3642 * take_over_console is basically a register followed by unbind
3643 */
3644int take_over_console(const struct consw *csw, int first, int last, int deflt)
3645{
3646 int err;
3647
3648 err = register_con_driver(csw, first, last);
3649 /* if we get an busy error we still want to bind the console driver
3650 * and return success, as we may have unbound the console driver
3651 * but not unregistered it.
3652 */
3653 if (err == -EBUSY)
3654 err = 0;
3655 if (!err)
3656 bind_con_driver(csw, first, last, deflt);
3657
3658 return err;
3659}
3660
3661/*
3662 * give_up_console is a wrapper to unregister_con_driver. It will only
3663 * work if driver is fully unbound.
3664 */
3665void give_up_console(const struct consw *csw)
3666{
3667 unregister_con_driver(csw);
3668}
3669
3670static int __init vtconsole_class_init(void)
3671{
3672 int i;
3673
3674 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3675 if (IS_ERR(vtconsole_class)) {
3676 printk(KERN_WARNING "Unable to create vt console class; "
3677 "errno = %ld\n", PTR_ERR(vtconsole_class));
3678 vtconsole_class = NULL;
3679 }
3680
3681 /* Add system drivers to sysfs */
3682 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3683 struct con_driver *con = ®istered_con_driver[i];
3684
3685 if (con->con && !con->dev) {
3686 con->dev = device_create(vtconsole_class, NULL,
3687 MKDEV(0, con->node),
3688 NULL, "vtcon%i",
3689 con->node);
3690
3691 if (IS_ERR(con->dev)) {
3692 printk(KERN_WARNING "Unable to create "
3693 "device for %s; errno = %ld\n",
3694 con->desc, PTR_ERR(con->dev));
3695 con->dev = NULL;
3696 } else {
3697 vtconsole_init_device(con);
3698 }
3699 }
3700 }
3701
3702 return 0;
3703}
3704postcore_initcall(vtconsole_class_init);
3705
3706#endif
3707
3708/*
3709 * Screen blanking
3710 */
3711
3712static int set_vesa_blanking(char __user *p)
3713{
3714 unsigned int mode;
3715
3716 if (get_user(mode, p + 1))
3717 return -EFAULT;
3718
3719 vesa_blank_mode = (mode < 4) ? mode : 0;
3720 return 0;
3721}
3722
3723void do_blank_screen(int entering_gfx)
3724{
3725 struct vc_data *vc = vc_cons[fg_console].d;
3726 int i;
3727
3728 WARN_CONSOLE_UNLOCKED();
3729
3730 if (console_blanked) {
3731 if (blank_state == blank_vesa_wait) {
3732 blank_state = blank_off;
3733 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3734 }
3735 return;
3736 }
3737
3738 /* entering graphics mode? */
3739 if (entering_gfx) {
3740 hide_cursor(vc);
3741 save_screen(vc);
3742 vc->vc_sw->con_blank(vc, -1, 1);
3743 console_blanked = fg_console + 1;
3744 blank_state = blank_off;
3745 set_origin(vc);
3746 return;
3747 }
3748
3749 if (blank_state != blank_normal_wait)
3750 return;
3751 blank_state = blank_off;
3752
3753 /* don't blank graphics */
3754 if (vc->vc_mode != KD_TEXT) {
3755 console_blanked = fg_console + 1;
3756 return;
3757 }
3758
3759 hide_cursor(vc);
3760 del_timer_sync(&console_timer);
3761 blank_timer_expired = 0;
3762
3763 save_screen(vc);
3764 /* In case we need to reset origin, blanking hook returns 1 */
3765 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3766 console_blanked = fg_console + 1;
3767 if (i)
3768 set_origin(vc);
3769
3770 if (console_blank_hook && console_blank_hook(1))
3771 return;
3772
3773 if (vesa_off_interval && vesa_blank_mode) {
3774 blank_state = blank_vesa_wait;
3775 mod_timer(&console_timer, jiffies + vesa_off_interval);
3776 }
3777 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3778}
3779EXPORT_SYMBOL(do_blank_screen);
3780
3781/*
3782 * Called by timer as well as from vt_console_driver
3783 */
3784void do_unblank_screen(int leaving_gfx)
3785{
3786 struct vc_data *vc;
3787
3788 /* This should now always be called from a "sane" (read: can schedule)
3789 * context for the sake of the low level drivers, except in the special
3790 * case of oops_in_progress
3791 */
3792 if (!oops_in_progress)
3793 might_sleep();
3794
3795 WARN_CONSOLE_UNLOCKED();
3796
3797 ignore_poke = 0;
3798 if (!console_blanked)
3799 return;
3800 if (!vc_cons_allocated(fg_console)) {
3801 /* impossible */
3802 pr_warning("unblank_screen: tty %d not allocated ??\n",
3803 fg_console+1);
3804 return;
3805 }
3806 vc = vc_cons[fg_console].d;
3807 /* Try to unblank in oops case too */
3808 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3809 return; /* but leave console_blanked != 0 */
3810
3811 if (blankinterval) {
3812 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3813 blank_state = blank_normal_wait;
3814 }
3815
3816 console_blanked = 0;
3817 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3818 /* Low-level driver cannot restore -> do it ourselves */
3819 update_screen(vc);
3820 if (console_blank_hook)
3821 console_blank_hook(0);
3822 set_palette(vc);
3823 set_cursor(vc);
3824 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3825}
3826EXPORT_SYMBOL(do_unblank_screen);
3827
3828/*
3829 * This is called by the outside world to cause a forced unblank, mostly for
3830 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3831 * call it with 1 as an argument and so force a mode restore... that may kill
3832 * X or at least garbage the screen but would also make the Oops visible...
3833 */
3834void unblank_screen(void)
3835{
3836 do_unblank_screen(0);
3837}
3838
3839/*
3840 * We defer the timer blanking to work queue so it can take the console mutex
3841 * (console operations can still happen at irq time, but only from printk which
3842 * has the console mutex. Not perfect yet, but better than no locking
3843 */
3844static void blank_screen_t(unsigned long dummy)
3845{
3846 if (unlikely(!keventd_up())) {
3847 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3848 return;
3849 }
3850 blank_timer_expired = 1;
3851 schedule_work(&console_work);
3852}
3853
3854void poke_blanked_console(void)
3855{
3856 WARN_CONSOLE_UNLOCKED();
3857
3858 /* Add this so we quickly catch whoever might call us in a non
3859 * safe context. Nowadays, unblank_screen() isn't to be called in
3860 * atomic contexts and is allowed to schedule (with the special case
3861 * of oops_in_progress, but that isn't of any concern for this
3862 * function. --BenH.
3863 */
3864 might_sleep();
3865
3866 /* This isn't perfectly race free, but a race here would be mostly harmless,
3867 * at worse, we'll do a spurrious blank and it's unlikely
3868 */
3869 del_timer(&console_timer);
3870 blank_timer_expired = 0;
3871
3872 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3873 return;
3874 if (console_blanked)
3875 unblank_screen();
3876 else if (blankinterval) {
3877 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3878 blank_state = blank_normal_wait;
3879 }
3880}
3881
3882/*
3883 * Palettes
3884 */
3885
3886static void set_palette(struct vc_data *vc)
3887{
3888 WARN_CONSOLE_UNLOCKED();
3889
3890 if (vc->vc_mode != KD_GRAPHICS)
3891 vc->vc_sw->con_set_palette(vc, color_table);
3892}
3893
3894static int set_get_cmap(unsigned char __user *arg, int set)
3895{
3896 int i, j, k;
3897
3898 WARN_CONSOLE_UNLOCKED();
3899
3900 for (i = 0; i < 16; i++)
3901 if (set) {
3902 get_user(default_red[i], arg++);
3903 get_user(default_grn[i], arg++);
3904 get_user(default_blu[i], arg++);
3905 } else {
3906 put_user(default_red[i], arg++);
3907 put_user(default_grn[i], arg++);
3908 put_user(default_blu[i], arg++);
3909 }
3910 if (set) {
3911 for (i = 0; i < MAX_NR_CONSOLES; i++)
3912 if (vc_cons_allocated(i)) {
3913 for (j = k = 0; j < 16; j++) {
3914 vc_cons[i].d->vc_palette[k++] = default_red[j];
3915 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3916 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3917 }
3918 set_palette(vc_cons[i].d);
3919 }
3920 }
3921 return 0;
3922}
3923
3924/*
3925 * Load palette into the DAC registers. arg points to a colour
3926 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3927 */
3928
3929int con_set_cmap(unsigned char __user *arg)
3930{
3931 int rc;
3932
3933 console_lock();
3934 rc = set_get_cmap (arg,1);
3935 console_unlock();
3936
3937 return rc;
3938}
3939
3940int con_get_cmap(unsigned char __user *arg)
3941{
3942 int rc;
3943
3944 console_lock();
3945 rc = set_get_cmap (arg,0);
3946 console_unlock();
3947
3948 return rc;
3949}
3950
3951void reset_palette(struct vc_data *vc)
3952{
3953 int j, k;
3954 for (j=k=0; j<16; j++) {
3955 vc->vc_palette[k++] = default_red[j];
3956 vc->vc_palette[k++] = default_grn[j];
3957 vc->vc_palette[k++] = default_blu[j];
3958 }
3959 set_palette(vc);
3960}
3961
3962/*
3963 * Font switching
3964 *
3965 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3966 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3967 * depending on width) reserved for each character which is kinda wasty, but
3968 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3969 * is up to the actual low-level console-driver convert data into its favorite
3970 * format (maybe we should add a `fontoffset' field to the `display'
3971 * structure so we won't have to convert the fontdata all the time.
3972 * /Jes
3973 */
3974
3975#define max_font_size 65536
3976
3977static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3978{
3979 struct console_font font;
3980 int rc = -EINVAL;
3981 int c;
3982
3983 if (vc->vc_mode != KD_TEXT)
3984 return -EINVAL;
3985
3986 if (op->data) {
3987 font.data = kmalloc(max_font_size, GFP_KERNEL);
3988 if (!font.data)
3989 return -ENOMEM;
3990 } else
3991 font.data = NULL;
3992
3993 console_lock();
3994 if (vc->vc_sw->con_font_get)
3995 rc = vc->vc_sw->con_font_get(vc, &font);
3996 else
3997 rc = -ENOSYS;
3998 console_unlock();
3999
4000 if (rc)
4001 goto out;
4002
4003 c = (font.width+7)/8 * 32 * font.charcount;
4004
4005 if (op->data && font.charcount > op->charcount)
4006 rc = -ENOSPC;
4007 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4008 if (font.width > op->width || font.height > op->height)
4009 rc = -ENOSPC;
4010 } else {
4011 if (font.width != 8)
4012 rc = -EIO;
4013 else if ((op->height && font.height > op->height) ||
4014 font.height > 32)
4015 rc = -ENOSPC;
4016 }
4017 if (rc)
4018 goto out;
4019
4020 op->height = font.height;
4021 op->width = font.width;
4022 op->charcount = font.charcount;
4023
4024 if (op->data && copy_to_user(op->data, font.data, c))
4025 rc = -EFAULT;
4026
4027out:
4028 kfree(font.data);
4029 return rc;
4030}
4031
4032static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4033{
4034 struct console_font font;
4035 int rc = -EINVAL;
4036 int size;
4037
4038 if (vc->vc_mode != KD_TEXT)
4039 return -EINVAL;
4040 if (!op->data)
4041 return -EINVAL;
4042 if (op->charcount > 512)
4043 return -EINVAL;
4044 if (!op->height) { /* Need to guess font height [compat] */
4045 int h, i;
4046 u8 __user *charmap = op->data;
4047 u8 tmp;
4048
4049 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4050 so that we can get rid of this soon */
4051 if (!(op->flags & KD_FONT_FLAG_OLD))
4052 return -EINVAL;
4053 for (h = 32; h > 0; h--)
4054 for (i = 0; i < op->charcount; i++) {
4055 if (get_user(tmp, &charmap[32*i+h-1]))
4056 return -EFAULT;
4057 if (tmp)
4058 goto nonzero;
4059 }
4060 return -EINVAL;
4061 nonzero:
4062 op->height = h;
4063 }
4064 if (op->width <= 0 || op->width > 32 || op->height > 32)
4065 return -EINVAL;
4066 size = (op->width+7)/8 * 32 * op->charcount;
4067 if (size > max_font_size)
4068 return -ENOSPC;
4069 font.charcount = op->charcount;
4070 font.height = op->height;
4071 font.width = op->width;
4072 font.data = memdup_user(op->data, size);
4073 if (IS_ERR(font.data))
4074 return PTR_ERR(font.data);
4075 console_lock();
4076 if (vc->vc_sw->con_font_set)
4077 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4078 else
4079 rc = -ENOSYS;
4080 console_unlock();
4081 kfree(font.data);
4082 return rc;
4083}
4084
4085static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4086{
4087 struct console_font font = {.width = op->width, .height = op->height};
4088 char name[MAX_FONT_NAME];
4089 char *s = name;
4090 int rc;
4091
4092 if (vc->vc_mode != KD_TEXT)
4093 return -EINVAL;
4094
4095 if (!op->data)
4096 s = NULL;
4097 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4098 return -EFAULT;
4099 else
4100 name[MAX_FONT_NAME - 1] = 0;
4101
4102 console_lock();
4103 if (vc->vc_sw->con_font_default)
4104 rc = vc->vc_sw->con_font_default(vc, &font, s);
4105 else
4106 rc = -ENOSYS;
4107 console_unlock();
4108 if (!rc) {
4109 op->width = font.width;
4110 op->height = font.height;
4111 }
4112 return rc;
4113}
4114
4115static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4116{
4117 int con = op->height;
4118 int rc;
4119
4120 if (vc->vc_mode != KD_TEXT)
4121 return -EINVAL;
4122
4123 console_lock();
4124 if (!vc->vc_sw->con_font_copy)
4125 rc = -ENOSYS;
4126 else if (con < 0 || !vc_cons_allocated(con))
4127 rc = -ENOTTY;
4128 else if (con == vc->vc_num) /* nothing to do */
4129 rc = 0;
4130 else
4131 rc = vc->vc_sw->con_font_copy(vc, con);
4132 console_unlock();
4133 return rc;
4134}
4135
4136int con_font_op(struct vc_data *vc, struct console_font_op *op)
4137{
4138 switch (op->op) {
4139 case KD_FONT_OP_SET:
4140 return con_font_set(vc, op);
4141 case KD_FONT_OP_GET:
4142 return con_font_get(vc, op);
4143 case KD_FONT_OP_SET_DEFAULT:
4144 return con_font_default(vc, op);
4145 case KD_FONT_OP_COPY:
4146 return con_font_copy(vc, op);
4147 }
4148 return -ENOSYS;
4149}
4150
4151/*
4152 * Interface exported to selection and vcs.
4153 */
4154
4155/* used by selection */
4156u16 screen_glyph(struct vc_data *vc, int offset)
4157{
4158 u16 w = scr_readw(screenpos(vc, offset, 1));
4159 u16 c = w & 0xff;
4160
4161 if (w & vc->vc_hi_font_mask)
4162 c |= 0x100;
4163 return c;
4164}
4165EXPORT_SYMBOL_GPL(screen_glyph);
4166
4167/* used by vcs - note the word offset */
4168unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4169{
4170 return screenpos(vc, 2 * w_offset, viewed);
4171}
4172
4173void getconsxy(struct vc_data *vc, unsigned char *p)
4174{
4175 p[0] = vc->vc_x;
4176 p[1] = vc->vc_y;
4177}
4178
4179void putconsxy(struct vc_data *vc, unsigned char *p)
4180{
4181 hide_cursor(vc);
4182 gotoxy(vc, p[0], p[1]);
4183 set_cursor(vc);
4184}
4185
4186u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4187{
4188 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4189 return softcursor_original;
4190 return scr_readw(org);
4191}
4192
4193void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4194{
4195 scr_writew(val, org);
4196 if ((unsigned long)org == vc->vc_pos) {
4197 softcursor_original = -1;
4198 add_softcursor(vc);
4199 }
4200}
4201
4202void vcs_scr_updated(struct vc_data *vc)
4203{
4204 notify_update(vc);
4205}
4206
4207/*
4208 * Visible symbols for modules
4209 */
4210
4211EXPORT_SYMBOL(color_table);
4212EXPORT_SYMBOL(default_red);
4213EXPORT_SYMBOL(default_grn);
4214EXPORT_SYMBOL(default_blu);
4215EXPORT_SYMBOL(update_region);
4216EXPORT_SYMBOL(redraw_screen);
4217EXPORT_SYMBOL(vc_resize);
4218EXPORT_SYMBOL(fg_console);
4219EXPORT_SYMBOL(console_blank_hook);
4220EXPORT_SYMBOL(console_blanked);
4221EXPORT_SYMBOL(vc_cons);
4222EXPORT_SYMBOL(global_cursor_default);
4223#ifndef VT_SINGLE_DRIVER
4224EXPORT_SYMBOL(take_over_console);
4225EXPORT_SYMBOL(give_up_console);
4226#endif
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
117struct 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
127static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
128const 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
137struct vc vc_cons [MAX_NR_CONSOLES];
138
139#ifndef VT_SINGLE_DRIVER
140static const struct consw *con_driver_map[MAX_NR_CONSOLES];
141#endif
142
143static int con_open(struct tty_struct *, struct file *);
144static void vc_init(struct vc_data *vc, unsigned int rows,
145 unsigned int cols, int do_clear);
146static void gotoxy(struct vc_data *vc, int new_x, int new_y);
147static void save_cur(struct vc_data *vc);
148static void reset_terminal(struct vc_data *vc, int do_clear);
149static void con_flush_chars(struct tty_struct *tty);
150static int set_vesa_blanking(char __user *p);
151static void set_cursor(struct vc_data *vc);
152static void hide_cursor(struct vc_data *vc);
153static void console_callback(struct work_struct *ignored);
154static void con_driver_unregister_callback(struct work_struct *ignored);
155static void blank_screen_t(struct timer_list *unused);
156static void set_palette(struct vc_data *vc);
157static void unblank_screen(void);
158
159#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
160
161int default_utf8 = true;
162module_param(default_utf8, int, S_IRUGO | S_IWUSR);
163int global_cursor_default = -1;
164module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
165
166static int cur_default = CUR_UNDERLINE;
167module_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 */
173static int ignore_poke;
174
175int do_poke_blanked_console;
176int console_blanked;
177
178static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
179static int vesa_off_interval;
180static int blankinterval;
181core_param(consoleblank, blankinterval, int, 0444);
182
183static DECLARE_WORK(console_work, console_callback);
184static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
185
186/*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
190 * saved_* variants are for save/restore around kernel debugger enter/leave
191 */
192int fg_console;
193int last_console;
194int want_console = -1;
195static int saved_fg_console;
196static int saved_last_console;
197static int saved_want_console;
198static int saved_vc_mode;
199static 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 */
207static 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 */
219static int scrollback_delta;
220
221/*
222 * Hook so that the power management routines can (un)blank
223 * the console on our behalf.
224 */
225int (*console_blank_hook)(int);
226
227static DEFINE_TIMER(console_timer, blank_screen_t);
228static int blank_state;
229static int blank_timer_expired;
230enum {
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 */
242static struct device *tty0dev;
243
244/*
245 * Notifier list for console events.
246 */
247static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
248
249int register_vt_notifier(struct notifier_block *nb)
250{
251 return atomic_notifier_chain_register(&vt_notifier_list, nb);
252}
253EXPORT_SYMBOL_GPL(register_vt_notifier);
254
255int unregister_vt_notifier(struct notifier_block *nb)
256{
257 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
258}
259EXPORT_SYMBOL_GPL(unregister_vt_notifier);
260
261static void notify_write(struct vc_data *vc, unsigned int unicode)
262{
263 struct vt_notifier_param param = { .vc = vc, .c = unicode };
264 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
265}
266
267static void notify_update(struct vc_data *vc)
268{
269 struct vt_notifier_param param = { .vc = vc };
270 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
271}
272/*
273 * Low-Level Functions
274 */
275
276static inline bool con_is_fg(const struct vc_data *vc)
277{
278 return vc->vc_num == fg_console;
279}
280
281static inline bool con_should_update(const struct vc_data *vc)
282{
283 return con_is_visible(vc) && !console_blanked;
284}
285
286static inline unsigned short *screenpos(const struct vc_data *vc, int offset,
287 bool viewed)
288{
289 unsigned short *p;
290
291 if (!viewed)
292 p = (unsigned short *)(vc->vc_origin + offset);
293 else if (!vc->vc_sw->con_screen_pos)
294 p = (unsigned short *)(vc->vc_visible_origin + offset);
295 else
296 p = vc->vc_sw->con_screen_pos(vc, offset);
297 return p;
298}
299
300/* Called from the keyboard irq path.. */
301static 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 scrollback_delta += lines;
307 schedule_console_callback();
308}
309
310void schedule_console_callback(void)
311{
312 schedule_work(&console_work);
313}
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
328typedef 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 */
334struct uni_screen {
335 char32_t *lines[0];
336};
337
338static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
339{
340 struct uni_screen *uniscr;
341 void *p;
342 unsigned int memsize, i;
343
344 /* allocate everything in one go */
345 memsize = cols * rows * sizeof(char32_t);
346 memsize += rows * sizeof(char32_t *);
347 p = vzalloc(memsize);
348 if (!p)
349 return NULL;
350
351 /* initial line pointers */
352 uniscr = p;
353 p = uniscr->lines + rows;
354 for (i = 0; i < rows; i++) {
355 uniscr->lines[i] = p;
356 p += cols * sizeof(char32_t);
357 }
358 return uniscr;
359}
360
361static void vc_uniscr_free(struct uni_screen *uniscr)
362{
363 vfree(uniscr);
364}
365
366static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
367{
368 vc_uniscr_free(vc->vc_uni_screen);
369 vc->vc_uni_screen = new_uniscr;
370}
371
372static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
373{
374 struct uni_screen *uniscr = get_vc_uniscr(vc);
375
376 if (uniscr)
377 uniscr->lines[vc->state.y][vc->state.x] = uc;
378}
379
380static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
381{
382 struct uni_screen *uniscr = get_vc_uniscr(vc);
383
384 if (uniscr) {
385 char32_t *ln = uniscr->lines[vc->state.y];
386 unsigned int x = vc->state.x, cols = vc->vc_cols;
387
388 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
389 memset32(&ln[x], ' ', nr);
390 }
391}
392
393static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
394{
395 struct uni_screen *uniscr = get_vc_uniscr(vc);
396
397 if (uniscr) {
398 char32_t *ln = uniscr->lines[vc->state.y];
399 unsigned int x = vc->state.x, cols = vc->vc_cols;
400
401 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
402 memset32(&ln[cols - nr], ' ', nr);
403 }
404}
405
406static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
407 unsigned int nr)
408{
409 struct uni_screen *uniscr = get_vc_uniscr(vc);
410
411 if (uniscr) {
412 char32_t *ln = uniscr->lines[vc->state.y];
413
414 memset32(&ln[x], ' ', nr);
415 }
416}
417
418static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
419 unsigned int nr)
420{
421 struct uni_screen *uniscr = get_vc_uniscr(vc);
422
423 if (uniscr) {
424 unsigned int cols = vc->vc_cols;
425
426 while (nr--)
427 memset32(uniscr->lines[y++], ' ', cols);
428 }
429}
430
431static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
432 enum con_scroll dir, unsigned int nr)
433{
434 struct uni_screen *uniscr = get_vc_uniscr(vc);
435
436 if (uniscr) {
437 unsigned int i, j, k, sz, d, clear;
438
439 sz = b - t;
440 clear = b - nr;
441 d = nr;
442 if (dir == SM_DOWN) {
443 clear = t;
444 d = sz - nr;
445 }
446 for (i = 0; i < gcd(d, sz); i++) {
447 char32_t *tmp = uniscr->lines[t + i];
448 j = i;
449 while (1) {
450 k = j + d;
451 if (k >= sz)
452 k -= sz;
453 if (k == i)
454 break;
455 uniscr->lines[t + j] = uniscr->lines[t + k];
456 j = k;
457 }
458 uniscr->lines[t + j] = tmp;
459 }
460 vc_uniscr_clear_lines(vc, clear, nr);
461 }
462}
463
464static 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 unsigned int dst_row = 0;
473
474 if (!dst)
475 return;
476
477 while (src_top_row < src_bot_row) {
478 char32_t *src_line = src->lines[src_top_row];
479 char32_t *dst_line = dst->lines[dst_row];
480
481 memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
482 if (dst_cols - src_cols)
483 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
484 src_top_row++;
485 dst_row++;
486 }
487 while (dst_row < dst_rows) {
488 char32_t *dst_line = dst->lines[dst_row];
489
490 memset32(dst_line, ' ', dst_cols);
491 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 */
501int vc_uniscr_check(struct vc_data *vc)
502{
503 struct uni_screen *uniscr;
504 unsigned short *p;
505 int x, y, mask;
506
507 if (__is_defined(NO_VC_UNI_SCREEN))
508 return -EOPNOTSUPP;
509
510 WARN_CONSOLE_UNLOCKED();
511
512 if (!vc->vc_utf)
513 return -ENODATA;
514
515 if (vc->vc_uni_screen)
516 return 0;
517
518 uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
519 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 p = (unsigned short *)vc->vc_origin;
529 mask = vc->vc_hi_font_mask | 0xff;
530 for (y = 0; y < vc->vc_rows; y++) {
531 char32_t *line = uniscr->lines[y];
532 for (x = 0; x < vc->vc_cols; x++) {
533 u16 glyph = scr_readw(p++) & mask;
534 line[x] = inverse_translate(vc, glyph, true);
535 }
536 }
537
538 vc->vc_uni_screen = uniscr;
539 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 */
547void 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 struct uni_screen *uniscr = get_vc_uniscr(vc);
551 int offset = row * vc->vc_size_row + col * 2;
552 unsigned long pos;
553
554 BUG_ON(!uniscr);
555
556 pos = (unsigned long)screenpos(vc, offset, viewed);
557 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 row = (pos - vc->vc_origin) / vc->vc_size_row;
564 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
565 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 u16 *p = (u16 *)pos;
574 int mask = vc->vc_hi_font_mask | 0xff;
575 char32_t *uni_buf = dest;
576 while (nr--) {
577 u16 glyph = scr_readw(p++) & mask;
578 *uni_buf++ = inverse_translate(vc, glyph, true);
579 }
580 }
581}
582
583/* this is for validation and debugging only */
584static void vc_uniscr_debug_check(struct vc_data *vc)
585{
586 struct uni_screen *uniscr = get_vc_uniscr(vc);
587 unsigned short *p;
588 int x, y, mask;
589
590 if (!VC_UNI_SCREEN_DEBUG || !uniscr)
591 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
620static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
621 enum con_scroll dir, unsigned int nr)
622{
623 u16 *clear, *d, *s;
624
625 if (t + nr >= b)
626 nr = b - t - 1;
627 if (b > vc->vc_rows || t >= b || nr < 1)
628 return;
629 vc_uniscr_scroll(vc, t, b, dir, nr);
630 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
631 return;
632
633 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
634 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
635
636 if (dir == SM_UP) {
637 clear = s + (b - t - nr) * vc->vc_cols;
638 swap(s, d);
639 }
640 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
641 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
642}
643
644static void do_update_region(struct vc_data *vc, unsigned long start, int count)
645{
646 unsigned int xx, yy, offset;
647 u16 *p;
648
649 p = (u16 *) start;
650 if (!vc->vc_sw->con_getxy) {
651 offset = (start - vc->vc_origin) / 2;
652 xx = offset % vc->vc_cols;
653 yy = offset / vc->vc_cols;
654 } else {
655 int nxx, nyy;
656 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
657 xx = nxx; yy = nyy;
658 }
659 for(;;) {
660 u16 attrib = scr_readw(p) & 0xff00;
661 int startx = xx;
662 u16 *q = p;
663 while (xx < vc->vc_cols && count) {
664 if (attrib != (scr_readw(p) & 0xff00)) {
665 if (p > q)
666 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
667 startx = xx;
668 q = p;
669 attrib = scr_readw(p) & 0xff00;
670 }
671 p++;
672 xx++;
673 count--;
674 }
675 if (p > q)
676 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
677 if (!count)
678 break;
679 xx = 0;
680 yy++;
681 if (vc->vc_sw->con_getxy) {
682 p = (u16 *)start;
683 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
684 }
685 }
686}
687
688void update_region(struct vc_data *vc, unsigned long start, int count)
689{
690 WARN_CONSOLE_UNLOCKED();
691
692 if (con_should_update(vc)) {
693 hide_cursor(vc);
694 do_update_region(vc, start, count);
695 set_cursor(vc);
696 }
697}
698
699/* Structure of attributes is hardware-dependent */
700
701static 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 if (vc->vc_sw->con_build_attr)
706 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 u8 a = _color;
721 if (!vc->vc_can_do_color)
722 return _intensity |
723 (_italic << 1) |
724 (_underline << 2) |
725 (_reverse << 3) |
726 (_blink << 7);
727 if (_italic)
728 a = (a & 0xF0) | vc->vc_itcolor;
729 else if (_underline)
730 a = (a & 0xf0) | vc->vc_ulcolor;
731 else if (_intensity == VCI_HALF_BRIGHT)
732 a = (a & 0xf0) | vc->vc_halfcolor;
733 if (_reverse)
734 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
735 if (_blink)
736 a ^= 0x80;
737 if (_intensity == VCI_BOLD)
738 a ^= 0x08;
739 if (vc->vc_hi_font_mask == 0x100)
740 a <<= 1;
741 return a;
742 }
743}
744
745static void update_attr(struct vc_data *vc)
746{
747 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
748 vc->state.blink, vc->state.underline,
749 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
750 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
751 VCI_NORMAL, vc->state.blink, false,
752 vc->vc_decscnm, false) << 8);
753}
754
755/* Note: inverting the screen twice should revert to the original state */
756void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
757{
758 unsigned short *p;
759
760 WARN_CONSOLE_UNLOCKED();
761
762 count /= 2;
763 p = screenpos(vc, offset, viewed);
764 if (vc->vc_sw->con_invert_region) {
765 vc->vc_sw->con_invert_region(vc, p, count);
766 } else {
767 u16 *q = p;
768 int cnt = count;
769 u16 a;
770
771 if (!vc->vc_can_do_color) {
772 while (cnt--) {
773 a = scr_readw(q);
774 a ^= 0x0800;
775 scr_writew(a, q);
776 q++;
777 }
778 } else if (vc->vc_hi_font_mask == 0x100) {
779 while (cnt--) {
780 a = scr_readw(q);
781 a = (a & 0x11ff) |
782 ((a & 0xe000) >> 4) |
783 ((a & 0x0e00) << 4);
784 scr_writew(a, q);
785 q++;
786 }
787 } else {
788 while (cnt--) {
789 a = scr_readw(q);
790 a = (a & 0x88ff) |
791 ((a & 0x7000) >> 4) |
792 ((a & 0x0700) << 4);
793 scr_writew(a, q);
794 q++;
795 }
796 }
797 }
798
799 if (con_should_update(vc))
800 do_update_region(vc, (unsigned long) p, count);
801 notify_update(vc);
802}
803
804/* used by selection: complement pointer position */
805void complement_pos(struct vc_data *vc, int offset)
806{
807 static int old_offset = -1;
808 static unsigned short old;
809 static unsigned short oldx, oldy;
810
811 WARN_CONSOLE_UNLOCKED();
812
813 if (old_offset != -1 && old_offset >= 0 &&
814 old_offset < vc->vc_screenbuf_size) {
815 scr_writew(old, screenpos(vc, old_offset, true));
816 if (con_should_update(vc))
817 vc->vc_sw->con_putc(vc, old, oldy, oldx);
818 notify_update(vc);
819 }
820
821 old_offset = offset;
822
823 if (offset != -1 && offset >= 0 &&
824 offset < vc->vc_screenbuf_size) {
825 unsigned short new;
826 unsigned short *p;
827 p = screenpos(vc, offset, true);
828 old = scr_readw(p);
829 new = old ^ vc->vc_complement_mask;
830 scr_writew(new, p);
831 if (con_should_update(vc)) {
832 oldx = (offset >> 1) % vc->vc_cols;
833 oldy = (offset >> 1) / vc->vc_cols;
834 vc->vc_sw->con_putc(vc, new, oldy, oldx);
835 }
836 notify_update(vc);
837 }
838}
839
840static void insert_char(struct vc_data *vc, unsigned int nr)
841{
842 unsigned short *p = (unsigned short *) vc->vc_pos;
843
844 vc_uniscr_insert(vc, nr);
845 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
846 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
847 vc->vc_need_wrap = 0;
848 if (con_should_update(vc))
849 do_update_region(vc, (unsigned long) p,
850 vc->vc_cols - vc->state.x);
851}
852
853static void delete_char(struct vc_data *vc, unsigned int nr)
854{
855 unsigned short *p = (unsigned short *) vc->vc_pos;
856
857 vc_uniscr_delete(vc, nr);
858 scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
859 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
860 nr * 2);
861 vc->vc_need_wrap = 0;
862 if (con_should_update(vc))
863 do_update_region(vc, (unsigned long) p,
864 vc->vc_cols - vc->state.x);
865}
866
867static int softcursor_original = -1;
868
869static void add_softcursor(struct vc_data *vc)
870{
871 int i = scr_readw((u16 *) vc->vc_pos);
872 u32 type = vc->vc_cursor_type;
873
874 if (!(type & CUR_SW))
875 return;
876 if (softcursor_original != -1)
877 return;
878 softcursor_original = i;
879 i |= CUR_SET(type);
880 i ^= CUR_CHANGE(type);
881 if ((type & CUR_ALWAYS_BG) &&
882 (softcursor_original & CUR_BG) == (i & CUR_BG))
883 i ^= CUR_BG;
884 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
885 i ^= CUR_FG;
886 scr_writew(i, (u16 *)vc->vc_pos);
887 if (con_should_update(vc))
888 vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x);
889}
890
891static void hide_softcursor(struct vc_data *vc)
892{
893 if (softcursor_original != -1) {
894 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
895 if (con_should_update(vc))
896 vc->vc_sw->con_putc(vc, softcursor_original,
897 vc->state.y, vc->state.x);
898 softcursor_original = -1;
899 }
900}
901
902static void hide_cursor(struct vc_data *vc)
903{
904 if (vc_is_sel(vc))
905 clear_selection();
906
907 vc->vc_sw->con_cursor(vc, CM_ERASE);
908 hide_softcursor(vc);
909}
910
911static void set_cursor(struct vc_data *vc)
912{
913 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
914 return;
915 if (vc->vc_deccm) {
916 if (vc_is_sel(vc))
917 clear_selection();
918 add_softcursor(vc);
919 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
920 vc->vc_sw->con_cursor(vc, CM_DRAW);
921 } else
922 hide_cursor(vc);
923}
924
925static void set_origin(struct vc_data *vc)
926{
927 WARN_CONSOLE_UNLOCKED();
928
929 if (!con_is_visible(vc) ||
930 !vc->vc_sw->con_set_origin ||
931 !vc->vc_sw->con_set_origin(vc))
932 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
933 vc->vc_visible_origin = vc->vc_origin;
934 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
935 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
936 2 * vc->state.x;
937}
938
939static void save_screen(struct vc_data *vc)
940{
941 WARN_CONSOLE_UNLOCKED();
942
943 if (vc->vc_sw->con_save_screen)
944 vc->vc_sw->con_save_screen(vc);
945}
946
947static void flush_scrollback(struct vc_data *vc)
948{
949 WARN_CONSOLE_UNLOCKED();
950
951 set_origin(vc);
952 if (vc->vc_sw->con_flush_scrollback) {
953 vc->vc_sw->con_flush_scrollback(vc);
954 } 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 hide_cursor(vc);
964 vc->vc_sw->con_switch(vc);
965 set_cursor(vc);
966 }
967}
968
969/*
970 * Redrawing of screen
971 */
972
973void clear_buffer_attributes(struct vc_data *vc)
974{
975 unsigned short *p = (unsigned short *)vc->vc_origin;
976 int count = vc->vc_screenbuf_size / 2;
977 int mask = vc->vc_hi_font_mask | 0xff;
978
979 for (; count > 0; count--, p++) {
980 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
981 }
982}
983
984void redraw_screen(struct vc_data *vc, int is_switch)
985{
986 int redraw = 0;
987
988 WARN_CONSOLE_UNLOCKED();
989
990 if (!vc) {
991 /* strange ... */
992 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
993 return;
994 }
995
996 if (is_switch) {
997 struct vc_data *old_vc = vc_cons[fg_console].d;
998 if (old_vc == vc)
999 return;
1000 if (!con_is_visible(vc))
1001 redraw = 1;
1002 *vc->vc_display_fg = vc;
1003 fg_console = vc->vc_num;
1004 hide_cursor(old_vc);
1005 if (!con_is_visible(old_vc)) {
1006 save_screen(old_vc);
1007 set_origin(old_vc);
1008 }
1009 if (tty0dev)
1010 sysfs_notify(&tty0dev->kobj, NULL, "active");
1011 } else {
1012 hide_cursor(vc);
1013 redraw = 1;
1014 }
1015
1016 if (redraw) {
1017 int update;
1018 int old_was_color = vc->vc_can_do_color;
1019
1020 set_origin(vc);
1021 update = vc->vc_sw->con_switch(vc);
1022 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 if (old_was_color != vc->vc_can_do_color) {
1030 update_attr(vc);
1031 clear_buffer_attributes(vc);
1032 }
1033
1034 if (update && vc->vc_mode != KD_GRAPHICS)
1035 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1036 }
1037 set_cursor(vc);
1038 if (is_switch) {
1039 vt_set_leds_compute_shiftstate();
1040 notify_update(vc);
1041 }
1042}
1043
1044/*
1045 * Allocation, freeing and resizing of VTs.
1046 */
1047
1048int vc_cons_allocated(unsigned int i)
1049{
1050 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1051}
1052
1053static void visual_init(struct vc_data *vc, int num, int init)
1054{
1055 /* ++Geert: vc->vc_sw->con_init determines console size */
1056 if (vc->vc_sw)
1057 module_put(vc->vc_sw->owner);
1058 vc->vc_sw = conswitchp;
1059#ifndef VT_SINGLE_DRIVER
1060 if (con_driver_map[num])
1061 vc->vc_sw = con_driver_map[num];
1062#endif
1063 __module_get(vc->vc_sw->owner);
1064 vc->vc_num = num;
1065 vc->vc_display_fg = &master_display_fg;
1066 if (vc->uni_pagedict_loc)
1067 con_free_unimap(vc);
1068 vc->uni_pagedict_loc = &vc->uni_pagedict;
1069 vc->uni_pagedict = NULL;
1070 vc->vc_hi_font_mask = 0;
1071 vc->vc_complement_mask = 0;
1072 vc->vc_can_do_color = 0;
1073 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1074 vc->vc_sw->con_init(vc, init);
1075 if (!vc->vc_complement_mask)
1076 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1077 vc->vc_s_complement_mask = vc->vc_complement_mask;
1078 vc->vc_size_row = vc->vc_cols << 1;
1079 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1080}
1081
1082
1083static void visual_deinit(struct vc_data *vc)
1084{
1085 vc->vc_sw->con_deinit(vc);
1086 module_put(vc->vc_sw->owner);
1087}
1088
1089static void vc_port_destruct(struct tty_port *port)
1090{
1091 struct vc_data *vc = container_of(port, struct vc_data, port);
1092
1093 kfree(vc);
1094}
1095
1096static 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
1108int vc_allocate(unsigned int currcons) /* return 0 on success */
1109{
1110 struct vt_notifier_param param;
1111 struct vc_data *vc;
1112 int err;
1113
1114 WARN_CONSOLE_UNLOCKED();
1115
1116 if (currcons >= MAX_NR_CONSOLES)
1117 return -ENXIO;
1118
1119 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 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1129 if (!vc)
1130 return -ENOMEM;
1131
1132 vc_cons[currcons].d = vc;
1133 tty_port_init(&vc->port);
1134 vc->port.ops = &vc_port_ops;
1135 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1136
1137 visual_init(vc, currcons, 1);
1138
1139 if (!*vc->uni_pagedict_loc)
1140 con_set_default_unimap(vc);
1141
1142 err = -EINVAL;
1143 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1144 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1145 goto err_free;
1146 err = -ENOMEM;
1147 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1148 if (!vc->vc_screenbuf)
1149 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 if (global_cursor_default == -1)
1154 global_cursor_default = 1;
1155
1156 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1157 vcs_make_sysfs(currcons);
1158 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
1159
1160 return 0;
1161err_free:
1162 visual_deinit(vc);
1163 kfree(vc);
1164 vc_cons[currcons].d = NULL;
1165 return err;
1166}
1167
1168static 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 int err = 0;
1173
1174 if (vc->vc_sw->con_resize)
1175 err = vc->vc_sw->con_resize(vc, width, height, user);
1176
1177 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
1195static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1196 unsigned int cols, unsigned int lines)
1197{
1198 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1199 unsigned long end;
1200 unsigned int old_rows, old_row_size, first_copied_row;
1201 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1202 unsigned int user;
1203 unsigned short *oldscreen, *newscreen;
1204 struct uni_screen *new_uniscr = NULL;
1205
1206 WARN_CONSOLE_UNLOCKED();
1207
1208 if (!vc)
1209 return -ENXIO;
1210
1211 user = vc->vc_resize_user;
1212 vc->vc_resize_user = 0;
1213
1214 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1215 return -EINVAL;
1216
1217 new_cols = (cols ? cols : vc->vc_cols);
1218 new_rows = (lines ? lines : vc->vc_rows);
1219 new_row_size = new_cols << 1;
1220 new_screen_size = new_row_size * new_rows;
1221
1222 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1223 /*
1224 * This function is being called here to cover the case
1225 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1226 * passing the same fb_var_screeninfo containing the fields
1227 * yres/xres equal to a number non-multiple of vc_font.height
1228 * and yres_virtual/xres_virtual equal to number lesser than the
1229 * vc_font.height and yres/xres.
1230 * In the second call, the struct fb_var_screeninfo isn't
1231 * being modified by the underlying driver because of the
1232 * if above, and this causes the fbcon_display->vrows to become
1233 * negative and it eventually leads to out-of-bound
1234 * access by the imageblit function.
1235 * To give the correct values to the struct and to not have
1236 * to deal with possible errors from the code below, we call
1237 * the resize_screen here as well.
1238 */
1239 return resize_screen(vc, new_cols, new_rows, user);
1240 }
1241
1242 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1243 return -EINVAL;
1244 newscreen = kzalloc(new_screen_size, GFP_USER);
1245 if (!newscreen)
1246 return -ENOMEM;
1247
1248 if (get_vc_uniscr(vc)) {
1249 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1250 if (!new_uniscr) {
1251 kfree(newscreen);
1252 return -ENOMEM;
1253 }
1254 }
1255
1256 if (vc_is_sel(vc))
1257 clear_selection();
1258
1259 old_rows = vc->vc_rows;
1260 old_row_size = vc->vc_size_row;
1261
1262 err = resize_screen(vc, new_cols, new_rows, user);
1263 if (err) {
1264 kfree(newscreen);
1265 vc_uniscr_free(new_uniscr);
1266 return err;
1267 }
1268
1269 vc->vc_rows = new_rows;
1270 vc->vc_cols = new_cols;
1271 vc->vc_size_row = new_row_size;
1272 vc->vc_screenbuf_size = new_screen_size;
1273
1274 rlth = min(old_row_size, new_row_size);
1275 rrem = new_row_size - rlth;
1276 old_origin = vc->vc_origin;
1277 new_origin = (long) newscreen;
1278 new_scr_end = new_origin + new_screen_size;
1279
1280 if (vc->state.y > new_rows) {
1281 if (old_rows - vc->state.y < new_rows) {
1282 /*
1283 * Cursor near the bottom, copy contents from the
1284 * bottom of buffer
1285 */
1286 first_copied_row = (old_rows - new_rows);
1287 } else {
1288 /*
1289 * Cursor is in no man's land, copy 1/2 screenful
1290 * from the top and bottom of cursor position
1291 */
1292 first_copied_row = (vc->state.y - new_rows/2);
1293 }
1294 old_origin += first_copied_row * old_row_size;
1295 } else
1296 first_copied_row = 0;
1297 end = old_origin + old_row_size * min(old_rows, new_rows);
1298
1299 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1300 get_vc_uniscr(vc), rlth/2, first_copied_row,
1301 min(old_rows, new_rows));
1302 vc_uniscr_set(vc, new_uniscr);
1303
1304 update_attr(vc);
1305
1306 while (old_origin < end) {
1307 scr_memcpyw((unsigned short *) new_origin,
1308 (unsigned short *) old_origin, rlth);
1309 if (rrem)
1310 scr_memsetw((void *)(new_origin + rlth),
1311 vc->vc_video_erase_char, rrem);
1312 old_origin += old_row_size;
1313 new_origin += new_row_size;
1314 }
1315 if (new_scr_end > new_origin)
1316 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1317 new_scr_end - new_origin);
1318 oldscreen = vc->vc_screenbuf;
1319 vc->vc_screenbuf = newscreen;
1320 vc->vc_screenbuf_size = new_screen_size;
1321 set_origin(vc);
1322 kfree(oldscreen);
1323
1324 /* do part of a reset_terminal() */
1325 vc->vc_top = 0;
1326 vc->vc_bottom = vc->vc_rows;
1327 gotoxy(vc, vc->state.x, vc->state.y);
1328 save_cur(vc);
1329
1330 if (tty) {
1331 /* Rewrite the requested winsize data with the actual
1332 resulting sizes */
1333 struct winsize ws;
1334 memset(&ws, 0, sizeof(ws));
1335 ws.ws_row = vc->vc_rows;
1336 ws.ws_col = vc->vc_cols;
1337 ws.ws_ypixel = vc->vc_scan_lines;
1338 tty_do_resize(tty, &ws);
1339 }
1340
1341 if (con_is_visible(vc))
1342 update_screen(vc);
1343 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1344 notify_update(vc);
1345 return err;
1346}
1347
1348/**
1349 * vc_resize - resize a VT
1350 * @vc: virtual console
1351 * @cols: columns
1352 * @rows: rows
1353 *
1354 * Resize a virtual console as seen from the console end of things. We
1355 * use the common vc_do_resize methods to update the structures. The
1356 * caller must hold the console sem to protect console internals and
1357 * vc->port.tty
1358 */
1359
1360int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1361{
1362 return vc_do_resize(vc->port.tty, vc, cols, rows);
1363}
1364
1365/**
1366 * vt_resize - resize a VT
1367 * @tty: tty to resize
1368 * @ws: winsize attributes
1369 *
1370 * Resize a virtual terminal. This is called by the tty layer as we
1371 * register our own handler for resizing. The mutual helper does all
1372 * the actual work.
1373 *
1374 * Takes the console sem and the called methods then take the tty
1375 * termios_rwsem and the tty ctrl.lock in that order.
1376 */
1377static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1378{
1379 struct vc_data *vc = tty->driver_data;
1380 int ret;
1381
1382 console_lock();
1383 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1384 console_unlock();
1385 return ret;
1386}
1387
1388struct vc_data *vc_deallocate(unsigned int currcons)
1389{
1390 struct vc_data *vc = NULL;
1391
1392 WARN_CONSOLE_UNLOCKED();
1393
1394 if (vc_cons_allocated(currcons)) {
1395 struct vt_notifier_param param;
1396
1397 param.vc = vc = vc_cons[currcons].d;
1398 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1399 vcs_remove_sysfs(currcons);
1400 visual_deinit(vc);
1401 con_free_unimap(vc);
1402 put_pid(vc->vt_pid);
1403 vc_uniscr_set(vc, NULL);
1404 kfree(vc->vc_screenbuf);
1405 vc_cons[currcons].d = NULL;
1406 }
1407 return vc;
1408}
1409
1410/*
1411 * VT102 emulator
1412 */
1413
1414enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1415
1416#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1417#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1418#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1419
1420#define decarm VC_REPEAT
1421#define decckm VC_CKMODE
1422#define kbdapplic VC_APPLIC
1423#define lnm VC_CRLF
1424
1425const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1426 8,12,10,14, 9,13,11,15 };
1427
1428/* the default colour table, for VGA+ colour systems */
1429unsigned char default_red[] = {
1430 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1431 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1432};
1433module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1434
1435unsigned char default_grn[] = {
1436 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1437 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1438};
1439module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1440
1441unsigned char default_blu[] = {
1442 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1443 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1444};
1445module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1446
1447/*
1448 * gotoxy() must verify all boundaries, because the arguments
1449 * might also be negative. If the given position is out of
1450 * bounds, the cursor is placed at the nearest margin.
1451 */
1452static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1453{
1454 int min_y, max_y;
1455
1456 if (new_x < 0)
1457 vc->state.x = 0;
1458 else {
1459 if (new_x >= vc->vc_cols)
1460 vc->state.x = vc->vc_cols - 1;
1461 else
1462 vc->state.x = new_x;
1463 }
1464
1465 if (vc->vc_decom) {
1466 min_y = vc->vc_top;
1467 max_y = vc->vc_bottom;
1468 } else {
1469 min_y = 0;
1470 max_y = vc->vc_rows;
1471 }
1472 if (new_y < min_y)
1473 vc->state.y = min_y;
1474 else if (new_y >= max_y)
1475 vc->state.y = max_y - 1;
1476 else
1477 vc->state.y = new_y;
1478 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1479 (vc->state.x << 1);
1480 vc->vc_need_wrap = 0;
1481}
1482
1483/* for absolute user moves, when decom is set */
1484static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1485{
1486 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1487}
1488
1489void scrollback(struct vc_data *vc)
1490{
1491 scrolldelta(-(vc->vc_rows / 2));
1492}
1493
1494void scrollfront(struct vc_data *vc, int lines)
1495{
1496 if (!lines)
1497 lines = vc->vc_rows / 2;
1498 scrolldelta(lines);
1499}
1500
1501static void lf(struct vc_data *vc)
1502{
1503 /* don't scroll if above bottom of scrolling region, or
1504 * if below scrolling region
1505 */
1506 if (vc->state.y + 1 == vc->vc_bottom)
1507 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1508 else if (vc->state.y < vc->vc_rows - 1) {
1509 vc->state.y++;
1510 vc->vc_pos += vc->vc_size_row;
1511 }
1512 vc->vc_need_wrap = 0;
1513 notify_write(vc, '\n');
1514}
1515
1516static void ri(struct vc_data *vc)
1517{
1518 /* don't scroll if below top of scrolling region, or
1519 * if above scrolling region
1520 */
1521 if (vc->state.y == vc->vc_top)
1522 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1523 else if (vc->state.y > 0) {
1524 vc->state.y--;
1525 vc->vc_pos -= vc->vc_size_row;
1526 }
1527 vc->vc_need_wrap = 0;
1528}
1529
1530static inline void cr(struct vc_data *vc)
1531{
1532 vc->vc_pos -= vc->state.x << 1;
1533 vc->vc_need_wrap = vc->state.x = 0;
1534 notify_write(vc, '\r');
1535}
1536
1537static inline void bs(struct vc_data *vc)
1538{
1539 if (vc->state.x) {
1540 vc->vc_pos -= 2;
1541 vc->state.x--;
1542 vc->vc_need_wrap = 0;
1543 notify_write(vc, '\b');
1544 }
1545}
1546
1547static inline void del(struct vc_data *vc)
1548{
1549 /* ignored */
1550}
1551
1552static void csi_J(struct vc_data *vc, int vpar)
1553{
1554 unsigned int count;
1555 unsigned short * start;
1556
1557 switch (vpar) {
1558 case 0: /* erase from cursor to end of display */
1559 vc_uniscr_clear_line(vc, vc->state.x,
1560 vc->vc_cols - vc->state.x);
1561 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1562 vc->vc_rows - vc->state.y - 1);
1563 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1564 start = (unsigned short *)vc->vc_pos;
1565 break;
1566 case 1: /* erase from start to cursor */
1567 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1568 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1569 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1570 start = (unsigned short *)vc->vc_origin;
1571 break;
1572 case 3: /* include scrollback */
1573 flush_scrollback(vc);
1574 fallthrough;
1575 case 2: /* erase whole display */
1576 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1577 count = vc->vc_cols * vc->vc_rows;
1578 start = (unsigned short *)vc->vc_origin;
1579 break;
1580 default:
1581 return;
1582 }
1583 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1584 if (con_should_update(vc))
1585 do_update_region(vc, (unsigned long) start, count);
1586 vc->vc_need_wrap = 0;
1587}
1588
1589static void csi_K(struct vc_data *vc, int vpar)
1590{
1591 unsigned int count;
1592 unsigned short *start = (unsigned short *)vc->vc_pos;
1593 int offset;
1594
1595 switch (vpar) {
1596 case 0: /* erase from cursor to end of line */
1597 offset = 0;
1598 count = vc->vc_cols - vc->state.x;
1599 break;
1600 case 1: /* erase from start of line to cursor */
1601 offset = -vc->state.x;
1602 count = vc->state.x + 1;
1603 break;
1604 case 2: /* erase whole line */
1605 offset = -vc->state.x;
1606 count = vc->vc_cols;
1607 break;
1608 default:
1609 return;
1610 }
1611 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
1612 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1613 vc->vc_need_wrap = 0;
1614 if (con_should_update(vc))
1615 do_update_region(vc, (unsigned long)(start + offset), count);
1616}
1617
1618/* erase the following vpar positions */
1619static void csi_X(struct vc_data *vc, unsigned int vpar)
1620{ /* not vt100? */
1621 unsigned int count;
1622
1623 if (!vpar)
1624 vpar++;
1625
1626 count = min(vpar, vc->vc_cols - vc->state.x);
1627
1628 vc_uniscr_clear_line(vc, vc->state.x, count);
1629 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1630 if (con_should_update(vc))
1631 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
1632 vc->vc_need_wrap = 0;
1633}
1634
1635static void default_attr(struct vc_data *vc)
1636{
1637 vc->state.intensity = VCI_NORMAL;
1638 vc->state.italic = false;
1639 vc->state.underline = false;
1640 vc->state.reverse = false;
1641 vc->state.blink = false;
1642 vc->state.color = vc->vc_def_color;
1643}
1644
1645struct rgb { u8 r; u8 g; u8 b; };
1646
1647static void rgb_from_256(int i, struct rgb *c)
1648{
1649 if (i < 8) { /* Standard colours. */
1650 c->r = i&1 ? 0xaa : 0x00;
1651 c->g = i&2 ? 0xaa : 0x00;
1652 c->b = i&4 ? 0xaa : 0x00;
1653 } else if (i < 16) {
1654 c->r = i&1 ? 0xff : 0x55;
1655 c->g = i&2 ? 0xff : 0x55;
1656 c->b = i&4 ? 0xff : 0x55;
1657 } else if (i < 232) { /* 6x6x6 colour cube. */
1658 c->r = (i - 16) / 36 * 85 / 2;
1659 c->g = (i - 16) / 6 % 6 * 85 / 2;
1660 c->b = (i - 16) % 6 * 85 / 2;
1661 } else /* Grayscale ramp. */
1662 c->r = c->g = c->b = i * 10 - 2312;
1663}
1664
1665static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1666{
1667 u8 hue = 0, max = max3(c->r, c->g, c->b);
1668
1669 if (c->r > max / 2)
1670 hue |= 4;
1671 if (c->g > max / 2)
1672 hue |= 2;
1673 if (c->b > max / 2)
1674 hue |= 1;
1675
1676 if (hue == 7 && max <= 0x55) {
1677 hue = 0;
1678 vc->state.intensity = VCI_BOLD;
1679 } else if (max > 0xaa)
1680 vc->state.intensity = VCI_BOLD;
1681 else
1682 vc->state.intensity = VCI_NORMAL;
1683
1684 vc->state.color = (vc->state.color & 0xf0) | hue;
1685}
1686
1687static void rgb_background(struct vc_data *vc, const struct rgb *c)
1688{
1689 /* For backgrounds, err on the dark side. */
1690 vc->state.color = (vc->state.color & 0x0f)
1691 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1692}
1693
1694/*
1695 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1696 * and thus need to be detected and ignored by hand. That standard also
1697 * wants : rather than ; as separators but sequences containing : are currently
1698 * completely ignored by the parser.
1699 *
1700 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1701 * supporting them.
1702 */
1703static int vc_t416_color(struct vc_data *vc, int i,
1704 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1705{
1706 struct rgb c;
1707
1708 i++;
1709 if (i > vc->vc_npar)
1710 return i;
1711
1712 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1713 /* 256 colours */
1714 i++;
1715 rgb_from_256(vc->vc_par[i], &c);
1716 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1717 /* 24 bit */
1718 c.r = vc->vc_par[i + 1];
1719 c.g = vc->vc_par[i + 2];
1720 c.b = vc->vc_par[i + 3];
1721 i += 3;
1722 } else
1723 return i;
1724
1725 set_color(vc, &c);
1726
1727 return i;
1728}
1729
1730/* console_lock is held */
1731static void csi_m(struct vc_data *vc)
1732{
1733 int i;
1734
1735 for (i = 0; i <= vc->vc_npar; i++)
1736 switch (vc->vc_par[i]) {
1737 case 0: /* all attributes off */
1738 default_attr(vc);
1739 break;
1740 case 1:
1741 vc->state.intensity = VCI_BOLD;
1742 break;
1743 case 2:
1744 vc->state.intensity = VCI_HALF_BRIGHT;
1745 break;
1746 case 3:
1747 vc->state.italic = true;
1748 break;
1749 case 21:
1750 /*
1751 * No console drivers support double underline, so
1752 * convert it to a single underline.
1753 */
1754 case 4:
1755 vc->state.underline = true;
1756 break;
1757 case 5:
1758 vc->state.blink = true;
1759 break;
1760 case 7:
1761 vc->state.reverse = true;
1762 break;
1763 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1764 * Select primary font, don't display control chars if
1765 * defined, don't set bit 8 on output.
1766 */
1767 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
1768 vc->vc_disp_ctrl = 0;
1769 vc->vc_toggle_meta = 0;
1770 break;
1771 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1772 * Select first alternate font, lets chars < 32 be
1773 * displayed as ROM chars.
1774 */
1775 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1776 vc->vc_disp_ctrl = 1;
1777 vc->vc_toggle_meta = 0;
1778 break;
1779 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1780 * Select second alternate font, toggle high bit
1781 * before displaying as ROM char.
1782 */
1783 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1784 vc->vc_disp_ctrl = 1;
1785 vc->vc_toggle_meta = 1;
1786 break;
1787 case 22:
1788 vc->state.intensity = VCI_NORMAL;
1789 break;
1790 case 23:
1791 vc->state.italic = false;
1792 break;
1793 case 24:
1794 vc->state.underline = false;
1795 break;
1796 case 25:
1797 vc->state.blink = false;
1798 break;
1799 case 27:
1800 vc->state.reverse = false;
1801 break;
1802 case 38:
1803 i = vc_t416_color(vc, i, rgb_foreground);
1804 break;
1805 case 48:
1806 i = vc_t416_color(vc, i, rgb_background);
1807 break;
1808 case 39:
1809 vc->state.color = (vc->vc_def_color & 0x0f) |
1810 (vc->state.color & 0xf0);
1811 break;
1812 case 49:
1813 vc->state.color = (vc->vc_def_color & 0xf0) |
1814 (vc->state.color & 0x0f);
1815 break;
1816 default:
1817 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1818 if (vc->vc_par[i] < 100)
1819 vc->state.intensity = VCI_BOLD;
1820 vc->vc_par[i] -= 60;
1821 }
1822 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1823 vc->state.color = color_table[vc->vc_par[i] - 30]
1824 | (vc->state.color & 0xf0);
1825 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1826 vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
1827 | (vc->state.color & 0x0f);
1828 break;
1829 }
1830 update_attr(vc);
1831}
1832
1833static void respond_string(const char *p, size_t len, struct tty_port *port)
1834{
1835 tty_insert_flip_string(port, p, len);
1836 tty_flip_buffer_push(port);
1837}
1838
1839static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1840{
1841 char buf[40];
1842 int len;
1843
1844 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1845 (vc->vc_decom ? vc->vc_top + 1 : 1),
1846 vc->state.x + 1);
1847 respond_string(buf, len, tty->port);
1848}
1849
1850static inline void status_report(struct tty_struct *tty)
1851{
1852 static const char teminal_ok[] = "\033[0n";
1853
1854 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1855}
1856
1857static inline void respond_ID(struct tty_struct *tty)
1858{
1859 /* terminal answer to an ESC-Z or csi0c query. */
1860 static const char vt102_id[] = "\033[?6c";
1861
1862 respond_string(vt102_id, strlen(vt102_id), tty->port);
1863}
1864
1865void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1866{
1867 char buf[8];
1868 int len;
1869
1870 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1871 (char)('!' + mrx), (char)('!' + mry));
1872 respond_string(buf, len, tty->port);
1873}
1874
1875/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1876int mouse_reporting(void)
1877{
1878 return vc_cons[fg_console].d->vc_report_mouse;
1879}
1880
1881/* console_lock is held */
1882static void set_mode(struct vc_data *vc, int on_off)
1883{
1884 int i;
1885
1886 for (i = 0; i <= vc->vc_npar; i++)
1887 if (vc->vc_priv == EPdec) {
1888 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1889 case 1: /* Cursor keys send ^[Ox/^[[x */
1890 if (on_off)
1891 set_kbd(vc, decckm);
1892 else
1893 clr_kbd(vc, decckm);
1894 break;
1895 case 3: /* 80/132 mode switch unimplemented */
1896#if 0
1897 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1898 /* this alone does not suffice; some user mode
1899 utility has to change the hardware regs */
1900#endif
1901 break;
1902 case 5: /* Inverted screen on/off */
1903 if (vc->vc_decscnm != on_off) {
1904 vc->vc_decscnm = on_off;
1905 invert_screen(vc, 0,
1906 vc->vc_screenbuf_size,
1907 false);
1908 update_attr(vc);
1909 }
1910 break;
1911 case 6: /* Origin relative/absolute */
1912 vc->vc_decom = on_off;
1913 gotoxay(vc, 0, 0);
1914 break;
1915 case 7: /* Autowrap on/off */
1916 vc->vc_decawm = on_off;
1917 break;
1918 case 8: /* Autorepeat on/off */
1919 if (on_off)
1920 set_kbd(vc, decarm);
1921 else
1922 clr_kbd(vc, decarm);
1923 break;
1924 case 9:
1925 vc->vc_report_mouse = on_off ? 1 : 0;
1926 break;
1927 case 25: /* Cursor on/off */
1928 vc->vc_deccm = on_off;
1929 break;
1930 case 1000:
1931 vc->vc_report_mouse = on_off ? 2 : 0;
1932 break;
1933 }
1934 } else {
1935 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1936 case 3: /* Monitor (display ctrls) */
1937 vc->vc_disp_ctrl = on_off;
1938 break;
1939 case 4: /* Insert Mode on/off */
1940 vc->vc_decim = on_off;
1941 break;
1942 case 20: /* Lf, Enter == CrLf/Lf */
1943 if (on_off)
1944 set_kbd(vc, lnm);
1945 else
1946 clr_kbd(vc, lnm);
1947 break;
1948 }
1949 }
1950}
1951
1952/* console_lock is held */
1953static void setterm_command(struct vc_data *vc)
1954{
1955 switch (vc->vc_par[0]) {
1956 case 1: /* set color for underline mode */
1957 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1958 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1959 if (vc->state.underline)
1960 update_attr(vc);
1961 }
1962 break;
1963 case 2: /* set color for half intensity mode */
1964 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1965 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1966 if (vc->state.intensity == VCI_HALF_BRIGHT)
1967 update_attr(vc);
1968 }
1969 break;
1970 case 8: /* store colors as defaults */
1971 vc->vc_def_color = vc->vc_attr;
1972 if (vc->vc_hi_font_mask == 0x100)
1973 vc->vc_def_color >>= 1;
1974 default_attr(vc);
1975 update_attr(vc);
1976 break;
1977 case 9: /* set blanking interval */
1978 blankinterval = min(vc->vc_par[1], 60U) * 60;
1979 poke_blanked_console();
1980 break;
1981 case 10: /* set bell frequency in Hz */
1982 if (vc->vc_npar >= 1)
1983 vc->vc_bell_pitch = vc->vc_par[1];
1984 else
1985 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1986 break;
1987 case 11: /* set bell duration in msec */
1988 if (vc->vc_npar >= 1)
1989 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1990 msecs_to_jiffies(vc->vc_par[1]) : 0;
1991 else
1992 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1993 break;
1994 case 12: /* bring specified console to the front */
1995 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1996 set_console(vc->vc_par[1] - 1);
1997 break;
1998 case 13: /* unblank the screen */
1999 poke_blanked_console();
2000 break;
2001 case 14: /* set vesa powerdown interval */
2002 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
2003 break;
2004 case 15: /* activate the previous console */
2005 set_console(last_console);
2006 break;
2007 case 16: /* set cursor blink duration in msec */
2008 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
2009 vc->vc_par[1] <= USHRT_MAX)
2010 vc->vc_cur_blink_ms = vc->vc_par[1];
2011 else
2012 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2013 break;
2014 }
2015}
2016
2017/* console_lock is held */
2018static void csi_at(struct vc_data *vc, unsigned int nr)
2019{
2020 if (nr > vc->vc_cols - vc->state.x)
2021 nr = vc->vc_cols - vc->state.x;
2022 else if (!nr)
2023 nr = 1;
2024 insert_char(vc, nr);
2025}
2026
2027/* console_lock is held */
2028static void csi_L(struct vc_data *vc, unsigned int nr)
2029{
2030 if (nr > vc->vc_rows - vc->state.y)
2031 nr = vc->vc_rows - vc->state.y;
2032 else if (!nr)
2033 nr = 1;
2034 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
2035 vc->vc_need_wrap = 0;
2036}
2037
2038/* console_lock is held */
2039static void csi_P(struct vc_data *vc, unsigned int nr)
2040{
2041 if (nr > vc->vc_cols - vc->state.x)
2042 nr = vc->vc_cols - vc->state.x;
2043 else if (!nr)
2044 nr = 1;
2045 delete_char(vc, nr);
2046}
2047
2048/* console_lock is held */
2049static void csi_M(struct vc_data *vc, unsigned int nr)
2050{
2051 if (nr > vc->vc_rows - vc->state.y)
2052 nr = vc->vc_rows - vc->state.y;
2053 else if (!nr)
2054 nr=1;
2055 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
2056 vc->vc_need_wrap = 0;
2057}
2058
2059/* console_lock is held (except via vc_init->reset_terminal */
2060static void save_cur(struct vc_data *vc)
2061{
2062 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
2063}
2064
2065/* console_lock is held */
2066static void restore_cur(struct vc_data *vc)
2067{
2068 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2069
2070 gotoxy(vc, vc->state.x, vc->state.y);
2071 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2072 vc);
2073 update_attr(vc);
2074 vc->vc_need_wrap = 0;
2075}
2076
2077enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2078 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2079 ESpalette, ESosc, ESapc, ESpm, ESdcs };
2080
2081/* console_lock is held (except via vc_init()) */
2082static void reset_terminal(struct vc_data *vc, int do_clear)
2083{
2084 unsigned int i;
2085
2086 vc->vc_top = 0;
2087 vc->vc_bottom = vc->vc_rows;
2088 vc->vc_state = ESnormal;
2089 vc->vc_priv = EPecma;
2090 vc->vc_translate = set_translate(LAT1_MAP, vc);
2091 vc->state.Gx_charset[0] = LAT1_MAP;
2092 vc->state.Gx_charset[1] = GRAF_MAP;
2093 vc->state.charset = 0;
2094 vc->vc_need_wrap = 0;
2095 vc->vc_report_mouse = 0;
2096 vc->vc_utf = default_utf8;
2097 vc->vc_utf_count = 0;
2098
2099 vc->vc_disp_ctrl = 0;
2100 vc->vc_toggle_meta = 0;
2101
2102 vc->vc_decscnm = 0;
2103 vc->vc_decom = 0;
2104 vc->vc_decawm = 1;
2105 vc->vc_deccm = global_cursor_default;
2106 vc->vc_decim = 0;
2107
2108 vt_reset_keyboard(vc->vc_num);
2109
2110 vc->vc_cursor_type = cur_default;
2111 vc->vc_complement_mask = vc->vc_s_complement_mask;
2112
2113 default_attr(vc);
2114 update_attr(vc);
2115
2116 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2117 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2118 set_bit(i, vc->vc_tab_stop);
2119
2120 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2121 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2122 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2123
2124 gotoxy(vc, 0, 0);
2125 save_cur(vc);
2126 if (do_clear)
2127 csi_J(vc, 2);
2128}
2129
2130static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
2131{
2132 unsigned char *charset = &vc->state.Gx_charset[which];
2133
2134 switch (c) {
2135 case '0':
2136 *charset = GRAF_MAP;
2137 break;
2138 case 'B':
2139 *charset = LAT1_MAP;
2140 break;
2141 case 'U':
2142 *charset = IBMPC_MAP;
2143 break;
2144 case 'K':
2145 *charset = USER_MAP;
2146 break;
2147 }
2148
2149 if (vc->state.charset == which)
2150 vc->vc_translate = set_translate(*charset, vc);
2151}
2152
2153/* is this state an ANSI control string? */
2154static bool ansi_control_string(unsigned int state)
2155{
2156 if (state == ESosc || state == ESapc || state == ESpm || state == ESdcs)
2157 return true;
2158 return false;
2159}
2160
2161/* console_lock is held */
2162static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2163{
2164 /*
2165 * Control characters can be used in the _middle_
2166 * of an escape sequence, aside from ANSI control strings.
2167 */
2168 if (ansi_control_string(vc->vc_state) && c >= 8 && c <= 13)
2169 return;
2170 switch (c) {
2171 case 0:
2172 return;
2173 case 7:
2174 if (ansi_control_string(vc->vc_state))
2175 vc->vc_state = ESnormal;
2176 else if (vc->vc_bell_duration)
2177 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2178 return;
2179 case 8:
2180 bs(vc);
2181 return;
2182 case 9:
2183 vc->vc_pos -= (vc->state.x << 1);
2184
2185 vc->state.x = find_next_bit(vc->vc_tab_stop,
2186 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2187 vc->state.x + 1);
2188 if (vc->state.x >= VC_TABSTOPS_COUNT)
2189 vc->state.x = vc->vc_cols - 1;
2190
2191 vc->vc_pos += (vc->state.x << 1);
2192 notify_write(vc, '\t');
2193 return;
2194 case 10: case 11: case 12:
2195 lf(vc);
2196 if (!is_kbd(vc, lnm))
2197 return;
2198 fallthrough;
2199 case 13:
2200 cr(vc);
2201 return;
2202 case 14:
2203 vc->state.charset = 1;
2204 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
2205 vc->vc_disp_ctrl = 1;
2206 return;
2207 case 15:
2208 vc->state.charset = 0;
2209 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
2210 vc->vc_disp_ctrl = 0;
2211 return;
2212 case 24: case 26:
2213 vc->vc_state = ESnormal;
2214 return;
2215 case 27:
2216 vc->vc_state = ESesc;
2217 return;
2218 case 127:
2219 del(vc);
2220 return;
2221 case 128+27:
2222 vc->vc_state = ESsquare;
2223 return;
2224 }
2225 switch(vc->vc_state) {
2226 case ESesc:
2227 vc->vc_state = ESnormal;
2228 switch (c) {
2229 case '[':
2230 vc->vc_state = ESsquare;
2231 return;
2232 case ']':
2233 vc->vc_state = ESnonstd;
2234 return;
2235 case '_':
2236 vc->vc_state = ESapc;
2237 return;
2238 case '^':
2239 vc->vc_state = ESpm;
2240 return;
2241 case '%':
2242 vc->vc_state = ESpercent;
2243 return;
2244 case 'E':
2245 cr(vc);
2246 lf(vc);
2247 return;
2248 case 'M':
2249 ri(vc);
2250 return;
2251 case 'D':
2252 lf(vc);
2253 return;
2254 case 'H':
2255 if (vc->state.x < VC_TABSTOPS_COUNT)
2256 set_bit(vc->state.x, vc->vc_tab_stop);
2257 return;
2258 case 'P':
2259 vc->vc_state = ESdcs;
2260 return;
2261 case 'Z':
2262 respond_ID(tty);
2263 return;
2264 case '7':
2265 save_cur(vc);
2266 return;
2267 case '8':
2268 restore_cur(vc);
2269 return;
2270 case '(':
2271 vc->vc_state = ESsetG0;
2272 return;
2273 case ')':
2274 vc->vc_state = ESsetG1;
2275 return;
2276 case '#':
2277 vc->vc_state = EShash;
2278 return;
2279 case 'c':
2280 reset_terminal(vc, 1);
2281 return;
2282 case '>': /* Numeric keypad */
2283 clr_kbd(vc, kbdapplic);
2284 return;
2285 case '=': /* Appl. keypad */
2286 set_kbd(vc, kbdapplic);
2287 return;
2288 }
2289 return;
2290 case ESnonstd:
2291 if (c=='P') { /* palette escape sequence */
2292 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2293 vc->vc_par[vc->vc_npar] = 0;
2294 vc->vc_npar = 0;
2295 vc->vc_state = ESpalette;
2296 return;
2297 } else if (c=='R') { /* reset palette */
2298 reset_palette(vc);
2299 vc->vc_state = ESnormal;
2300 } else if (c>='0' && c<='9')
2301 vc->vc_state = ESosc;
2302 else
2303 vc->vc_state = ESnormal;
2304 return;
2305 case ESpalette:
2306 if (isxdigit(c)) {
2307 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2308 if (vc->vc_npar == 7) {
2309 int i = vc->vc_par[0] * 3, j = 1;
2310 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2311 vc->vc_palette[i++] += vc->vc_par[j++];
2312 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2313 vc->vc_palette[i++] += vc->vc_par[j++];
2314 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2315 vc->vc_palette[i] += vc->vc_par[j];
2316 set_palette(vc);
2317 vc->vc_state = ESnormal;
2318 }
2319 } else
2320 vc->vc_state = ESnormal;
2321 return;
2322 case ESsquare:
2323 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2324 vc->vc_par[vc->vc_npar] = 0;
2325 vc->vc_npar = 0;
2326 vc->vc_state = ESgetpars;
2327 if (c == '[') { /* Function key */
2328 vc->vc_state=ESfunckey;
2329 return;
2330 }
2331 switch (c) {
2332 case '?':
2333 vc->vc_priv = EPdec;
2334 return;
2335 case '>':
2336 vc->vc_priv = EPgt;
2337 return;
2338 case '=':
2339 vc->vc_priv = EPeq;
2340 return;
2341 case '<':
2342 vc->vc_priv = EPlt;
2343 return;
2344 }
2345 vc->vc_priv = EPecma;
2346 fallthrough;
2347 case ESgetpars:
2348 if (c == ';' && vc->vc_npar < NPAR - 1) {
2349 vc->vc_npar++;
2350 return;
2351 } else if (c>='0' && c<='9') {
2352 vc->vc_par[vc->vc_npar] *= 10;
2353 vc->vc_par[vc->vc_npar] += c - '0';
2354 return;
2355 }
2356 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2357 vc->vc_state = EScsiignore;
2358 return;
2359 }
2360 vc->vc_state = ESnormal;
2361 switch(c) {
2362 case 'h':
2363 if (vc->vc_priv <= EPdec)
2364 set_mode(vc, 1);
2365 return;
2366 case 'l':
2367 if (vc->vc_priv <= EPdec)
2368 set_mode(vc, 0);
2369 return;
2370 case 'c':
2371 if (vc->vc_priv == EPdec) {
2372 if (vc->vc_par[0])
2373 vc->vc_cursor_type =
2374 CUR_MAKE(vc->vc_par[0],
2375 vc->vc_par[1],
2376 vc->vc_par[2]);
2377 else
2378 vc->vc_cursor_type = cur_default;
2379 return;
2380 }
2381 break;
2382 case 'm':
2383 if (vc->vc_priv == EPdec) {
2384 clear_selection();
2385 if (vc->vc_par[0])
2386 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2387 else
2388 vc->vc_complement_mask = vc->vc_s_complement_mask;
2389 return;
2390 }
2391 break;
2392 case 'n':
2393 if (vc->vc_priv == EPecma) {
2394 if (vc->vc_par[0] == 5)
2395 status_report(tty);
2396 else if (vc->vc_par[0] == 6)
2397 cursor_report(vc, tty);
2398 }
2399 return;
2400 }
2401 if (vc->vc_priv != EPecma) {
2402 vc->vc_priv = EPecma;
2403 return;
2404 }
2405 switch(c) {
2406 case 'G': case '`':
2407 if (vc->vc_par[0])
2408 vc->vc_par[0]--;
2409 gotoxy(vc, vc->vc_par[0], vc->state.y);
2410 return;
2411 case 'A':
2412 if (!vc->vc_par[0])
2413 vc->vc_par[0]++;
2414 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
2415 return;
2416 case 'B': case 'e':
2417 if (!vc->vc_par[0])
2418 vc->vc_par[0]++;
2419 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
2420 return;
2421 case 'C': case 'a':
2422 if (!vc->vc_par[0])
2423 vc->vc_par[0]++;
2424 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
2425 return;
2426 case 'D':
2427 if (!vc->vc_par[0])
2428 vc->vc_par[0]++;
2429 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
2430 return;
2431 case 'E':
2432 if (!vc->vc_par[0])
2433 vc->vc_par[0]++;
2434 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
2435 return;
2436 case 'F':
2437 if (!vc->vc_par[0])
2438 vc->vc_par[0]++;
2439 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
2440 return;
2441 case 'd':
2442 if (vc->vc_par[0])
2443 vc->vc_par[0]--;
2444 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
2445 return;
2446 case 'H': case 'f':
2447 if (vc->vc_par[0])
2448 vc->vc_par[0]--;
2449 if (vc->vc_par[1])
2450 vc->vc_par[1]--;
2451 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2452 return;
2453 case 'J':
2454 csi_J(vc, vc->vc_par[0]);
2455 return;
2456 case 'K':
2457 csi_K(vc, vc->vc_par[0]);
2458 return;
2459 case 'L':
2460 csi_L(vc, vc->vc_par[0]);
2461 return;
2462 case 'M':
2463 csi_M(vc, vc->vc_par[0]);
2464 return;
2465 case 'P':
2466 csi_P(vc, vc->vc_par[0]);
2467 return;
2468 case 'c':
2469 if (!vc->vc_par[0])
2470 respond_ID(tty);
2471 return;
2472 case 'g':
2473 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2474 set_bit(vc->state.x, vc->vc_tab_stop);
2475 else if (vc->vc_par[0] == 3)
2476 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2477 return;
2478 case 'm':
2479 csi_m(vc);
2480 return;
2481 case 'q': /* DECLL - but only 3 leds */
2482 /* map 0,1,2,3 to 0,1,2,4 */
2483 if (vc->vc_par[0] < 4)
2484 vt_set_led_state(vc->vc_num,
2485 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2486 return;
2487 case 'r':
2488 if (!vc->vc_par[0])
2489 vc->vc_par[0]++;
2490 if (!vc->vc_par[1])
2491 vc->vc_par[1] = vc->vc_rows;
2492 /* Minimum allowed region is 2 lines */
2493 if (vc->vc_par[0] < vc->vc_par[1] &&
2494 vc->vc_par[1] <= vc->vc_rows) {
2495 vc->vc_top = vc->vc_par[0] - 1;
2496 vc->vc_bottom = vc->vc_par[1];
2497 gotoxay(vc, 0, 0);
2498 }
2499 return;
2500 case 's':
2501 save_cur(vc);
2502 return;
2503 case 'u':
2504 restore_cur(vc);
2505 return;
2506 case 'X':
2507 csi_X(vc, vc->vc_par[0]);
2508 return;
2509 case '@':
2510 csi_at(vc, vc->vc_par[0]);
2511 return;
2512 case ']': /* setterm functions */
2513 setterm_command(vc);
2514 return;
2515 }
2516 return;
2517 case EScsiignore:
2518 if (c >= 20 && c <= 0x3f)
2519 return;
2520 vc->vc_state = ESnormal;
2521 return;
2522 case ESpercent:
2523 vc->vc_state = ESnormal;
2524 switch (c) {
2525 case '@': /* defined in ISO 2022 */
2526 vc->vc_utf = 0;
2527 return;
2528 case 'G': /* prelim official escape code */
2529 case '8': /* retained for compatibility */
2530 vc->vc_utf = 1;
2531 return;
2532 }
2533 return;
2534 case ESfunckey:
2535 vc->vc_state = ESnormal;
2536 return;
2537 case EShash:
2538 vc->vc_state = ESnormal;
2539 if (c == '8') {
2540 /* DEC screen alignment test. kludge :-) */
2541 vc->vc_video_erase_char =
2542 (vc->vc_video_erase_char & 0xff00) | 'E';
2543 csi_J(vc, 2);
2544 vc->vc_video_erase_char =
2545 (vc->vc_video_erase_char & 0xff00) | ' ';
2546 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2547 }
2548 return;
2549 case ESsetG0:
2550 vc_setGx(vc, 0, c);
2551 vc->vc_state = ESnormal;
2552 return;
2553 case ESsetG1:
2554 vc_setGx(vc, 1, c);
2555 vc->vc_state = ESnormal;
2556 return;
2557 case ESapc:
2558 return;
2559 case ESosc:
2560 return;
2561 case ESpm:
2562 return;
2563 case ESdcs:
2564 return;
2565 default:
2566 vc->vc_state = ESnormal;
2567 }
2568}
2569
2570/* is_double_width() is based on the wcwidth() implementation by
2571 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2572 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2573 */
2574struct interval {
2575 uint32_t first;
2576 uint32_t last;
2577};
2578
2579static int ucs_cmp(const void *key, const void *elt)
2580{
2581 uint32_t ucs = *(uint32_t *)key;
2582 struct interval e = *(struct interval *) elt;
2583
2584 if (ucs > e.last)
2585 return 1;
2586 else if (ucs < e.first)
2587 return -1;
2588 return 0;
2589}
2590
2591static int is_double_width(uint32_t ucs)
2592{
2593 static const struct interval double_width[] = {
2594 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2595 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2596 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2597 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2598 };
2599 if (ucs < double_width[0].first ||
2600 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2601 return 0;
2602
2603 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2604 sizeof(struct interval), ucs_cmp) != NULL;
2605}
2606
2607struct vc_draw_region {
2608 unsigned long from, to;
2609 int x;
2610};
2611
2612static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2613{
2614 if (draw->x < 0)
2615 return;
2616
2617 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2618 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2619 draw->x);
2620 draw->x = -1;
2621}
2622
2623static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2624{
2625 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2626 if (vc->vc_toggle_meta)
2627 c |= 0x80;
2628
2629 return vc->vc_translate[c];
2630 }
2631
2632 return c;
2633}
2634
2635
2636/**
2637 * vc_sanitize_unicode -- Replace invalid Unicode code points with U+FFFD
2638 * @c: the received character, or U+FFFD for invalid sequences.
2639 */
2640static inline int vc_sanitize_unicode(const int c)
2641{
2642 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2643 return 0xfffd;
2644
2645 return c;
2646}
2647
2648/**
2649 * vc_translate_unicode -- Combine UTF-8 into Unicode in @vc_utf_char
2650 * @vc: virtual console
2651 * @c: character to translate
2652 * @rescan: we return true if we need more (continuation) data
2653 *
2654 * @vc_utf_char is the being-constructed unicode character.
2655 * @vc_utf_count is the number of continuation bytes still expected to arrive.
2656 * @vc_npar is the number of continuation bytes arrived so far.
2657 */
2658static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2659{
2660 static const u32 utf8_length_changes[] = {
2661 0x0000007f, 0x000007ff, 0x0000ffff,
2662 0x001fffff, 0x03ffffff, 0x7fffffff
2663 };
2664
2665 /* Continuation byte received */
2666 if ((c & 0xc0) == 0x80) {
2667 /* Unexpected continuation byte? */
2668 if (!vc->vc_utf_count)
2669 return 0xfffd;
2670
2671 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2672 vc->vc_npar++;
2673 if (--vc->vc_utf_count)
2674 goto need_more_bytes;
2675
2676 /* Got a whole character */
2677 c = vc->vc_utf_char;
2678 /* Reject overlong sequences */
2679 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2680 c > utf8_length_changes[vc->vc_npar])
2681 return 0xfffd;
2682
2683 return vc_sanitize_unicode(c);
2684 }
2685
2686 /* Single ASCII byte or first byte of a sequence received */
2687 if (vc->vc_utf_count) {
2688 /* Continuation byte expected */
2689 *rescan = true;
2690 vc->vc_utf_count = 0;
2691 return 0xfffd;
2692 }
2693
2694 /* Nothing to do if an ASCII byte was received */
2695 if (c <= 0x7f)
2696 return c;
2697
2698 /* First byte of a multibyte sequence received */
2699 vc->vc_npar = 0;
2700 if ((c & 0xe0) == 0xc0) {
2701 vc->vc_utf_count = 1;
2702 vc->vc_utf_char = (c & 0x1f);
2703 } else if ((c & 0xf0) == 0xe0) {
2704 vc->vc_utf_count = 2;
2705 vc->vc_utf_char = (c & 0x0f);
2706 } else if ((c & 0xf8) == 0xf0) {
2707 vc->vc_utf_count = 3;
2708 vc->vc_utf_char = (c & 0x07);
2709 } else if ((c & 0xfc) == 0xf8) {
2710 vc->vc_utf_count = 4;
2711 vc->vc_utf_char = (c & 0x03);
2712 } else if ((c & 0xfe) == 0xfc) {
2713 vc->vc_utf_count = 5;
2714 vc->vc_utf_char = (c & 0x01);
2715 } else {
2716 /* 254 and 255 are invalid */
2717 return 0xfffd;
2718 }
2719
2720need_more_bytes:
2721 return -1;
2722}
2723
2724static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2725{
2726 /* Do no translation at all in control states */
2727 if (vc->vc_state != ESnormal)
2728 return *c;
2729
2730 if (vc->vc_utf && !vc->vc_disp_ctrl)
2731 return *c = vc_translate_unicode(vc, *c, rescan);
2732
2733 /* no utf or alternate charset mode */
2734 return vc_translate_ascii(vc, *c);
2735}
2736
2737static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2738{
2739 if (!vc->vc_can_do_color)
2740 return vc->vc_attr ^ 0x08;
2741
2742 if (vc->vc_hi_font_mask == 0x100)
2743 return (vc->vc_attr & 0x11) |
2744 ((vc->vc_attr & 0xe0) >> 4) |
2745 ((vc->vc_attr & 0x0e) << 4);
2746
2747 return (vc->vc_attr & 0x88) |
2748 ((vc->vc_attr & 0x70) >> 4) |
2749 ((vc->vc_attr & 0x07) << 4);
2750}
2751
2752static bool vc_is_control(struct vc_data *vc, int tc, int c)
2753{
2754 /*
2755 * A bitmap for codes <32. A bit of 1 indicates that the code
2756 * corresponding to that bit number invokes some special action (such
2757 * as cursor movement) and should not be displayed as a glyph unless
2758 * the disp_ctrl mode is explicitly enabled.
2759 */
2760 static const u32 CTRL_ACTION = 0x0d00ff81;
2761 /* Cannot be overridden by disp_ctrl */
2762 static const u32 CTRL_ALWAYS = 0x0800f501;
2763
2764 if (vc->vc_state != ESnormal)
2765 return true;
2766
2767 if (!tc)
2768 return true;
2769
2770 /*
2771 * If the original code was a control character we only allow a glyph
2772 * to be displayed if the code is not normally used (such as for cursor
2773 * movement) or if the disp_ctrl mode has been explicitly enabled.
2774 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2775 * displayed as control characters, as the console would be pretty
2776 * useless without them; to display an arbitrary font position use the
2777 * direct-to-font zone in UTF-8 mode.
2778 */
2779 if (c < 32) {
2780 if (vc->vc_disp_ctrl)
2781 return CTRL_ALWAYS & BIT(c);
2782 else
2783 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2784 }
2785
2786 if (c == 127 && !vc->vc_disp_ctrl)
2787 return true;
2788
2789 if (c == 128 + 27)
2790 return true;
2791
2792 return false;
2793}
2794
2795static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2796 struct vc_draw_region *draw)
2797{
2798 int next_c;
2799 unsigned char vc_attr = vc->vc_attr;
2800 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2801 u8 width = 1;
2802 bool inverse = false;
2803
2804 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2805 if (is_double_width(c))
2806 width = 2;
2807 }
2808
2809 /* Now try to find out how to display it */
2810 tc = conv_uni_to_pc(vc, tc);
2811 if (tc & ~charmask) {
2812 if (tc == -1 || tc == -2)
2813 return -1; /* nothing to display */
2814
2815 /* Glyph not found */
2816 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
2817 !(c & ~charmask)) {
2818 /*
2819 * In legacy mode use the glyph we get by a 1:1
2820 * mapping.
2821 * This would make absolutely no sense with Unicode in
2822 * mind, but do this for ASCII characters since a font
2823 * may lack Unicode mapping info and we don't want to
2824 * end up with having question marks only.
2825 */
2826 tc = c;
2827 } else {
2828 /*
2829 * Display U+FFFD. If it's not found, display an inverse
2830 * question mark.
2831 */
2832 tc = conv_uni_to_pc(vc, 0xfffd);
2833 if (tc < 0) {
2834 inverse = true;
2835 tc = conv_uni_to_pc(vc, '?');
2836 if (tc < 0)
2837 tc = '?';
2838
2839 vc_attr = vc_invert_attr(vc);
2840 con_flush(vc, draw);
2841 }
2842 }
2843 }
2844
2845 next_c = c;
2846 while (1) {
2847 if (vc->vc_need_wrap || vc->vc_decim)
2848 con_flush(vc, draw);
2849 if (vc->vc_need_wrap) {
2850 cr(vc);
2851 lf(vc);
2852 }
2853 if (vc->vc_decim)
2854 insert_char(vc, 1);
2855 vc_uniscr_putc(vc, next_c);
2856
2857 if (himask)
2858 tc = ((tc & 0x100) ? himask : 0) |
2859 (tc & 0xff);
2860 tc |= (vc_attr << 8) & ~himask;
2861
2862 scr_writew(tc, (u16 *)vc->vc_pos);
2863
2864 if (con_should_update(vc) && draw->x < 0) {
2865 draw->x = vc->state.x;
2866 draw->from = vc->vc_pos;
2867 }
2868 if (vc->state.x == vc->vc_cols - 1) {
2869 vc->vc_need_wrap = vc->vc_decawm;
2870 draw->to = vc->vc_pos + 2;
2871 } else {
2872 vc->state.x++;
2873 draw->to = (vc->vc_pos += 2);
2874 }
2875
2876 if (!--width)
2877 break;
2878
2879 /* A space is printed in the second column */
2880 tc = conv_uni_to_pc(vc, ' ');
2881 if (tc < 0)
2882 tc = ' ';
2883 next_c = ' ';
2884 }
2885 notify_write(vc, c);
2886
2887 if (inverse)
2888 con_flush(vc, draw);
2889
2890 return 0;
2891}
2892
2893/* acquires console_lock */
2894static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2895{
2896 struct vc_draw_region draw = {
2897 .x = -1,
2898 };
2899 int c, tc, n = 0;
2900 unsigned int currcons;
2901 struct vc_data *vc;
2902 struct vt_notifier_param param;
2903 bool rescan;
2904
2905 if (in_interrupt())
2906 return count;
2907
2908 console_lock();
2909 vc = tty->driver_data;
2910 if (vc == NULL) {
2911 pr_err("vt: argh, driver_data is NULL !\n");
2912 console_unlock();
2913 return 0;
2914 }
2915
2916 currcons = vc->vc_num;
2917 if (!vc_cons_allocated(currcons)) {
2918 /* could this happen? */
2919 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2920 console_unlock();
2921 return 0;
2922 }
2923
2924
2925 /* undraw cursor first */
2926 if (con_is_fg(vc))
2927 hide_cursor(vc);
2928
2929 param.vc = vc;
2930
2931 while (!tty->flow.stopped && count) {
2932 int orig = *buf;
2933 buf++;
2934 n++;
2935 count--;
2936rescan_last_byte:
2937 c = orig;
2938 rescan = false;
2939
2940 tc = vc_translate(vc, &c, &rescan);
2941 if (tc == -1)
2942 continue;
2943
2944 param.c = tc;
2945 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2946 ¶m) == NOTIFY_STOP)
2947 continue;
2948
2949 if (vc_is_control(vc, tc, c)) {
2950 con_flush(vc, &draw);
2951 do_con_trol(tty, vc, orig);
2952 continue;
2953 }
2954
2955 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
2956 continue;
2957
2958 if (rescan)
2959 goto rescan_last_byte;
2960 }
2961 con_flush(vc, &draw);
2962 vc_uniscr_debug_check(vc);
2963 console_conditional_schedule();
2964 notify_update(vc);
2965 console_unlock();
2966 return n;
2967}
2968
2969/*
2970 * This is the console switching callback.
2971 *
2972 * Doing console switching in a process context allows
2973 * us to do the switches asynchronously (needed when we want
2974 * to switch due to a keyboard interrupt). Synchronization
2975 * with other console code and prevention of re-entrancy is
2976 * ensured with console_lock.
2977 */
2978static void console_callback(struct work_struct *ignored)
2979{
2980 console_lock();
2981
2982 if (want_console >= 0) {
2983 if (want_console != fg_console &&
2984 vc_cons_allocated(want_console)) {
2985 hide_cursor(vc_cons[fg_console].d);
2986 change_console(vc_cons[want_console].d);
2987 /* we only changed when the console had already
2988 been allocated - a new console is not created
2989 in an interrupt routine */
2990 }
2991 want_console = -1;
2992 }
2993 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2994 do_poke_blanked_console = 0;
2995 poke_blanked_console();
2996 }
2997 if (scrollback_delta) {
2998 struct vc_data *vc = vc_cons[fg_console].d;
2999 clear_selection();
3000 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
3001 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
3002 scrollback_delta = 0;
3003 }
3004 if (blank_timer_expired) {
3005 do_blank_screen(0);
3006 blank_timer_expired = 0;
3007 }
3008 notify_update(vc_cons[fg_console].d);
3009
3010 console_unlock();
3011}
3012
3013int set_console(int nr)
3014{
3015 struct vc_data *vc = vc_cons[fg_console].d;
3016
3017 if (!vc_cons_allocated(nr) || vt_dont_switch ||
3018 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
3019
3020 /*
3021 * Console switch will fail in console_callback() or
3022 * change_console() so there is no point scheduling
3023 * the callback
3024 *
3025 * Existing set_console() users don't check the return
3026 * value so this shouldn't break anything
3027 */
3028 return -EINVAL;
3029 }
3030
3031 want_console = nr;
3032 schedule_console_callback();
3033
3034 return 0;
3035}
3036
3037struct tty_driver *console_driver;
3038
3039#ifdef CONFIG_VT_CONSOLE
3040
3041/**
3042 * vt_kmsg_redirect() - Sets/gets the kernel message console
3043 * @new: The new virtual terminal number or -1 if the console should stay
3044 * unchanged
3045 *
3046 * By default, the kernel messages are always printed on the current virtual
3047 * console. However, the user may modify that default with the
3048 * TIOCL_SETKMSGREDIRECT ioctl call.
3049 *
3050 * This function sets the kernel message console to be @new. It returns the old
3051 * virtual console number. The virtual terminal number 0 (both as parameter and
3052 * return value) means no redirection (i.e. always printed on the currently
3053 * active console).
3054 *
3055 * The parameter -1 means that only the current console is returned, but the
3056 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3057 * case to make the code more understandable.
3058 *
3059 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
3060 * the parameter and always returns 0.
3061 */
3062int vt_kmsg_redirect(int new)
3063{
3064 static int kmsg_con;
3065
3066 if (new != -1)
3067 return xchg(&kmsg_con, new);
3068 else
3069 return kmsg_con;
3070}
3071
3072/*
3073 * Console on virtual terminal
3074 *
3075 * The console must be locked when we get here.
3076 */
3077
3078static void vt_console_print(struct console *co, const char *b, unsigned count)
3079{
3080 struct vc_data *vc = vc_cons[fg_console].d;
3081 unsigned char c;
3082 static DEFINE_SPINLOCK(printing_lock);
3083 const ushort *start;
3084 ushort start_x, cnt;
3085 int kmsg_console;
3086
3087 WARN_CONSOLE_UNLOCKED();
3088
3089 /* this protects against concurrent oops only */
3090 if (!spin_trylock(&printing_lock))
3091 return;
3092
3093 kmsg_console = vt_get_kmsg_redirect();
3094 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3095 vc = vc_cons[kmsg_console - 1].d;
3096
3097 if (!vc_cons_allocated(fg_console)) {
3098 /* impossible */
3099 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3100 goto quit;
3101 }
3102
3103 if (vc->vc_mode != KD_TEXT)
3104 goto quit;
3105
3106 /* undraw cursor first */
3107 if (con_is_fg(vc))
3108 hide_cursor(vc);
3109
3110 start = (ushort *)vc->vc_pos;
3111 start_x = vc->state.x;
3112 cnt = 0;
3113 while (count--) {
3114 c = *b++;
3115 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
3116 if (cnt && con_is_visible(vc))
3117 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3118 cnt = 0;
3119 if (c == 8) { /* backspace */
3120 bs(vc);
3121 start = (ushort *)vc->vc_pos;
3122 start_x = vc->state.x;
3123 continue;
3124 }
3125 if (c != 13)
3126 lf(vc);
3127 cr(vc);
3128 start = (ushort *)vc->vc_pos;
3129 start_x = vc->state.x;
3130 if (c == 10 || c == 13)
3131 continue;
3132 }
3133 vc_uniscr_putc(vc, c);
3134 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3135 notify_write(vc, c);
3136 cnt++;
3137 if (vc->state.x == vc->vc_cols - 1) {
3138 vc->vc_need_wrap = 1;
3139 } else {
3140 vc->vc_pos += 2;
3141 vc->state.x++;
3142 }
3143 }
3144 if (cnt && con_is_visible(vc))
3145 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3146 set_cursor(vc);
3147 notify_update(vc);
3148
3149quit:
3150 spin_unlock(&printing_lock);
3151}
3152
3153static struct tty_driver *vt_console_device(struct console *c, int *index)
3154{
3155 *index = c->index ? c->index-1 : fg_console;
3156 return console_driver;
3157}
3158
3159static struct console vt_console_driver = {
3160 .name = "tty",
3161 .write = vt_console_print,
3162 .device = vt_console_device,
3163 .unblank = unblank_screen,
3164 .flags = CON_PRINTBUFFER,
3165 .index = -1,
3166};
3167#endif
3168
3169/*
3170 * Handling of Linux-specific VC ioctls
3171 */
3172
3173/*
3174 * Generally a bit racy with respect to console_lock();.
3175 *
3176 * There are some functions which don't need it.
3177 *
3178 * There are some functions which can sleep for arbitrary periods
3179 * (paste_selection) but we don't need the lock there anyway.
3180 *
3181 * set_selection_user has locking, and definitely needs it
3182 */
3183
3184int tioclinux(struct tty_struct *tty, unsigned long arg)
3185{
3186 char type, data;
3187 char __user *p = (char __user *)arg;
3188 int lines;
3189 int ret;
3190
3191 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3192 return -EPERM;
3193 if (get_user(type, p))
3194 return -EFAULT;
3195 ret = 0;
3196
3197 switch (type)
3198 {
3199 case TIOCL_SETSEL:
3200 ret = set_selection_user((struct tiocl_selection
3201 __user *)(p+1), tty);
3202 break;
3203 case TIOCL_PASTESEL:
3204 ret = paste_selection(tty);
3205 break;
3206 case TIOCL_UNBLANKSCREEN:
3207 console_lock();
3208 unblank_screen();
3209 console_unlock();
3210 break;
3211 case TIOCL_SELLOADLUT:
3212 console_lock();
3213 ret = sel_loadlut(p);
3214 console_unlock();
3215 break;
3216 case TIOCL_GETSHIFTSTATE:
3217
3218 /*
3219 * Make it possible to react to Shift+Mousebutton.
3220 * Note that 'shift_state' is an undocumented
3221 * kernel-internal variable; programs not closely
3222 * related to the kernel should not use this.
3223 */
3224 data = vt_get_shift_state();
3225 ret = put_user(data, p);
3226 break;
3227 case TIOCL_GETMOUSEREPORTING:
3228 console_lock(); /* May be overkill */
3229 data = mouse_reporting();
3230 console_unlock();
3231 ret = put_user(data, p);
3232 break;
3233 case TIOCL_SETVESABLANK:
3234 console_lock();
3235 ret = set_vesa_blanking(p);
3236 console_unlock();
3237 break;
3238 case TIOCL_GETKMSGREDIRECT:
3239 data = vt_get_kmsg_redirect();
3240 ret = put_user(data, p);
3241 break;
3242 case TIOCL_SETKMSGREDIRECT:
3243 if (!capable(CAP_SYS_ADMIN)) {
3244 ret = -EPERM;
3245 } else {
3246 if (get_user(data, p+1))
3247 ret = -EFAULT;
3248 else
3249 vt_kmsg_redirect(data);
3250 }
3251 break;
3252 case TIOCL_GETFGCONSOLE:
3253 /* No locking needed as this is a transiently
3254 correct return anyway if the caller hasn't
3255 disabled switching */
3256 ret = fg_console;
3257 break;
3258 case TIOCL_SCROLLCONSOLE:
3259 if (get_user(lines, (s32 __user *)(p+4))) {
3260 ret = -EFAULT;
3261 } else {
3262 /* Need the console lock here. Note that lots
3263 of other calls need fixing before the lock
3264 is actually useful ! */
3265 console_lock();
3266 scrollfront(vc_cons[fg_console].d, lines);
3267 console_unlock();
3268 ret = 0;
3269 }
3270 break;
3271 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3272 console_lock();
3273 ignore_poke = 1;
3274 do_blank_screen(0);
3275 console_unlock();
3276 break;
3277 case TIOCL_BLANKEDSCREEN:
3278 ret = console_blanked;
3279 break;
3280 default:
3281 ret = -EINVAL;
3282 break;
3283 }
3284 return ret;
3285}
3286
3287/*
3288 * /dev/ttyN handling
3289 */
3290
3291static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3292{
3293 int retval;
3294
3295 retval = do_con_write(tty, buf, count);
3296 con_flush_chars(tty);
3297
3298 return retval;
3299}
3300
3301static int con_put_char(struct tty_struct *tty, unsigned char ch)
3302{
3303 return do_con_write(tty, &ch, 1);
3304}
3305
3306static unsigned int con_write_room(struct tty_struct *tty)
3307{
3308 if (tty->flow.stopped)
3309 return 0;
3310 return 32768; /* No limit, really; we're not buffering */
3311}
3312
3313/*
3314 * con_throttle and con_unthrottle are only used for
3315 * paste_selection(), which has to stuff in a large number of
3316 * characters...
3317 */
3318static void con_throttle(struct tty_struct *tty)
3319{
3320}
3321
3322static void con_unthrottle(struct tty_struct *tty)
3323{
3324 struct vc_data *vc = tty->driver_data;
3325
3326 wake_up_interruptible(&vc->paste_wait);
3327}
3328
3329/*
3330 * Turn the Scroll-Lock LED on when the tty is stopped
3331 */
3332static void con_stop(struct tty_struct *tty)
3333{
3334 int console_num;
3335 if (!tty)
3336 return;
3337 console_num = tty->index;
3338 if (!vc_cons_allocated(console_num))
3339 return;
3340 vt_kbd_con_stop(console_num);
3341}
3342
3343/*
3344 * Turn the Scroll-Lock LED off when the console is started
3345 */
3346static void con_start(struct tty_struct *tty)
3347{
3348 int console_num;
3349 if (!tty)
3350 return;
3351 console_num = tty->index;
3352 if (!vc_cons_allocated(console_num))
3353 return;
3354 vt_kbd_con_start(console_num);
3355}
3356
3357static void con_flush_chars(struct tty_struct *tty)
3358{
3359 struct vc_data *vc;
3360
3361 if (in_interrupt()) /* from flush_to_ldisc */
3362 return;
3363
3364 /* if we race with con_close(), vt may be null */
3365 console_lock();
3366 vc = tty->driver_data;
3367 if (vc)
3368 set_cursor(vc);
3369 console_unlock();
3370}
3371
3372/*
3373 * Allocate the console screen memory.
3374 */
3375static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3376{
3377 unsigned int currcons = tty->index;
3378 struct vc_data *vc;
3379 int ret;
3380
3381 console_lock();
3382 ret = vc_allocate(currcons);
3383 if (ret)
3384 goto unlock;
3385
3386 vc = vc_cons[currcons].d;
3387
3388 /* Still being freed */
3389 if (vc->port.tty) {
3390 ret = -ERESTARTSYS;
3391 goto unlock;
3392 }
3393
3394 ret = tty_port_install(&vc->port, driver, tty);
3395 if (ret)
3396 goto unlock;
3397
3398 tty->driver_data = vc;
3399 vc->port.tty = tty;
3400 tty_port_get(&vc->port);
3401
3402 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3403 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3404 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3405 }
3406 if (vc->vc_utf)
3407 tty->termios.c_iflag |= IUTF8;
3408 else
3409 tty->termios.c_iflag &= ~IUTF8;
3410unlock:
3411 console_unlock();
3412 return ret;
3413}
3414
3415static int con_open(struct tty_struct *tty, struct file *filp)
3416{
3417 /* everything done in install */
3418 return 0;
3419}
3420
3421
3422static void con_close(struct tty_struct *tty, struct file *filp)
3423{
3424 /* Nothing to do - we defer to shutdown */
3425}
3426
3427static void con_shutdown(struct tty_struct *tty)
3428{
3429 struct vc_data *vc = tty->driver_data;
3430 BUG_ON(vc == NULL);
3431 console_lock();
3432 vc->port.tty = NULL;
3433 console_unlock();
3434}
3435
3436static void con_cleanup(struct tty_struct *tty)
3437{
3438 struct vc_data *vc = tty->driver_data;
3439
3440 tty_port_put(&vc->port);
3441}
3442
3443static int default_color = 7; /* white */
3444static int default_italic_color = 2; // green (ASCII)
3445static int default_underline_color = 3; // cyan (ASCII)
3446module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3447module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3448module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3449
3450static void vc_init(struct vc_data *vc, unsigned int rows,
3451 unsigned int cols, int do_clear)
3452{
3453 int j, k ;
3454
3455 vc->vc_cols = cols;
3456 vc->vc_rows = rows;
3457 vc->vc_size_row = cols << 1;
3458 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3459
3460 set_origin(vc);
3461 vc->vc_pos = vc->vc_origin;
3462 reset_vc(vc);
3463 for (j=k=0; j<16; j++) {
3464 vc->vc_palette[k++] = default_red[j] ;
3465 vc->vc_palette[k++] = default_grn[j] ;
3466 vc->vc_palette[k++] = default_blu[j] ;
3467 }
3468 vc->vc_def_color = default_color;
3469 vc->vc_ulcolor = default_underline_color;
3470 vc->vc_itcolor = default_italic_color;
3471 vc->vc_halfcolor = 0x08; /* grey */
3472 init_waitqueue_head(&vc->paste_wait);
3473 reset_terminal(vc, do_clear);
3474}
3475
3476/*
3477 * This routine initializes console interrupts, and does nothing
3478 * else. If you want the screen to clear, call tty_write with
3479 * the appropriate escape-sequence.
3480 */
3481
3482static int __init con_init(void)
3483{
3484 const char *display_desc = NULL;
3485 struct vc_data *vc;
3486 unsigned int currcons = 0, i;
3487
3488 console_lock();
3489
3490 if (!conswitchp)
3491 conswitchp = &dummy_con;
3492 display_desc = conswitchp->con_startup();
3493 if (!display_desc) {
3494 fg_console = 0;
3495 console_unlock();
3496 return 0;
3497 }
3498
3499 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3500 struct con_driver *con_driver = ®istered_con_driver[i];
3501
3502 if (con_driver->con == NULL) {
3503 con_driver->con = conswitchp;
3504 con_driver->desc = display_desc;
3505 con_driver->flag = CON_DRIVER_FLAG_INIT;
3506 con_driver->first = 0;
3507 con_driver->last = MAX_NR_CONSOLES - 1;
3508 break;
3509 }
3510 }
3511
3512 for (i = 0; i < MAX_NR_CONSOLES; i++)
3513 con_driver_map[i] = conswitchp;
3514
3515 if (blankinterval) {
3516 blank_state = blank_normal_wait;
3517 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3518 }
3519
3520 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3521 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3522 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3523 tty_port_init(&vc->port);
3524 visual_init(vc, currcons, 1);
3525 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3526 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3527 vc_init(vc, vc->vc_rows, vc->vc_cols,
3528 currcons || !vc->vc_sw->con_save_screen);
3529 }
3530 currcons = fg_console = 0;
3531 master_display_fg = vc = vc_cons[currcons].d;
3532 set_origin(vc);
3533 save_screen(vc);
3534 gotoxy(vc, vc->state.x, vc->state.y);
3535 csi_J(vc, 0);
3536 update_screen(vc);
3537 pr_info("Console: %s %s %dx%d\n",
3538 vc->vc_can_do_color ? "colour" : "mono",
3539 display_desc, vc->vc_cols, vc->vc_rows);
3540
3541 console_unlock();
3542
3543#ifdef CONFIG_VT_CONSOLE
3544 register_console(&vt_console_driver);
3545#endif
3546 return 0;
3547}
3548console_initcall(con_init);
3549
3550static const struct tty_operations con_ops = {
3551 .install = con_install,
3552 .open = con_open,
3553 .close = con_close,
3554 .write = con_write,
3555 .write_room = con_write_room,
3556 .put_char = con_put_char,
3557 .flush_chars = con_flush_chars,
3558 .ioctl = vt_ioctl,
3559#ifdef CONFIG_COMPAT
3560 .compat_ioctl = vt_compat_ioctl,
3561#endif
3562 .stop = con_stop,
3563 .start = con_start,
3564 .throttle = con_throttle,
3565 .unthrottle = con_unthrottle,
3566 .resize = vt_resize,
3567 .shutdown = con_shutdown,
3568 .cleanup = con_cleanup,
3569};
3570
3571static struct cdev vc0_cdev;
3572
3573static ssize_t show_tty_active(struct device *dev,
3574 struct device_attribute *attr, char *buf)
3575{
3576 return sprintf(buf, "tty%d\n", fg_console + 1);
3577}
3578static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3579
3580static struct attribute *vt_dev_attrs[] = {
3581 &dev_attr_active.attr,
3582 NULL
3583};
3584
3585ATTRIBUTE_GROUPS(vt_dev);
3586
3587int __init vty_init(const struct file_operations *console_fops)
3588{
3589 cdev_init(&vc0_cdev, console_fops);
3590 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3591 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3592 panic("Couldn't register /dev/tty0 driver\n");
3593 tty0dev = device_create_with_groups(tty_class, NULL,
3594 MKDEV(TTY_MAJOR, 0), NULL,
3595 vt_dev_groups, "tty0");
3596 if (IS_ERR(tty0dev))
3597 tty0dev = NULL;
3598
3599 vcs_init();
3600
3601 console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3602 TTY_DRIVER_RESET_TERMIOS);
3603 if (IS_ERR(console_driver))
3604 panic("Couldn't allocate console driver\n");
3605
3606 console_driver->name = "tty";
3607 console_driver->name_base = 1;
3608 console_driver->major = TTY_MAJOR;
3609 console_driver->minor_start = 1;
3610 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3611 console_driver->init_termios = tty_std_termios;
3612 if (default_utf8)
3613 console_driver->init_termios.c_iflag |= IUTF8;
3614 tty_set_operations(console_driver, &con_ops);
3615 if (tty_register_driver(console_driver))
3616 panic("Couldn't register console driver\n");
3617 kbd_init();
3618 console_map_init();
3619#ifdef CONFIG_MDA_CONSOLE
3620 mda_console_init();
3621#endif
3622 return 0;
3623}
3624
3625#ifndef VT_SINGLE_DRIVER
3626
3627static struct class *vtconsole_class;
3628
3629static int do_bind_con_driver(const struct consw *csw, int first, int last,
3630 int deflt)
3631{
3632 struct module *owner = csw->owner;
3633 const char *desc = NULL;
3634 struct con_driver *con_driver;
3635 int i, j = -1, k = -1, retval = -ENODEV;
3636
3637 if (!try_module_get(owner))
3638 return -ENODEV;
3639
3640 WARN_CONSOLE_UNLOCKED();
3641
3642 /* check if driver is registered */
3643 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3644 con_driver = ®istered_con_driver[i];
3645
3646 if (con_driver->con == csw) {
3647 desc = con_driver->desc;
3648 retval = 0;
3649 break;
3650 }
3651 }
3652
3653 if (retval)
3654 goto err;
3655
3656 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3657 csw->con_startup();
3658 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3659 }
3660
3661 if (deflt) {
3662 if (conswitchp)
3663 module_put(conswitchp->owner);
3664
3665 __module_get(owner);
3666 conswitchp = csw;
3667 }
3668
3669 first = max(first, con_driver->first);
3670 last = min(last, con_driver->last);
3671
3672 for (i = first; i <= last; i++) {
3673 int old_was_color;
3674 struct vc_data *vc = vc_cons[i].d;
3675
3676 if (con_driver_map[i])
3677 module_put(con_driver_map[i]->owner);
3678 __module_get(owner);
3679 con_driver_map[i] = csw;
3680
3681 if (!vc || !vc->vc_sw)
3682 continue;
3683
3684 j = i;
3685
3686 if (con_is_visible(vc)) {
3687 k = i;
3688 save_screen(vc);
3689 }
3690
3691 old_was_color = vc->vc_can_do_color;
3692 vc->vc_sw->con_deinit(vc);
3693 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3694 visual_init(vc, i, 0);
3695 set_origin(vc);
3696 update_attr(vc);
3697
3698 /* If the console changed between mono <-> color, then
3699 * the attributes in the screenbuf will be wrong. The
3700 * following resets all attributes to something sane.
3701 */
3702 if (old_was_color != vc->vc_can_do_color)
3703 clear_buffer_attributes(vc);
3704 }
3705
3706 pr_info("Console: switching ");
3707 if (!deflt)
3708 pr_cont("consoles %d-%d ", first + 1, last + 1);
3709 if (j >= 0) {
3710 struct vc_data *vc = vc_cons[j].d;
3711
3712 pr_cont("to %s %s %dx%d\n",
3713 vc->vc_can_do_color ? "colour" : "mono",
3714 desc, vc->vc_cols, vc->vc_rows);
3715
3716 if (k >= 0) {
3717 vc = vc_cons[k].d;
3718 update_screen(vc);
3719 }
3720 } else {
3721 pr_cont("to %s\n", desc);
3722 }
3723
3724 retval = 0;
3725err:
3726 module_put(owner);
3727 return retval;
3728};
3729
3730
3731#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3732int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3733{
3734 struct module *owner = csw->owner;
3735 const struct consw *defcsw = NULL;
3736 struct con_driver *con_driver = NULL, *con_back = NULL;
3737 int i, retval = -ENODEV;
3738
3739 if (!try_module_get(owner))
3740 return -ENODEV;
3741
3742 WARN_CONSOLE_UNLOCKED();
3743
3744 /* check if driver is registered and if it is unbindable */
3745 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3746 con_driver = ®istered_con_driver[i];
3747
3748 if (con_driver->con == csw &&
3749 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3750 retval = 0;
3751 break;
3752 }
3753 }
3754
3755 if (retval)
3756 goto err;
3757
3758 retval = -ENODEV;
3759
3760 /* check if backup driver exists */
3761 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3762 con_back = ®istered_con_driver[i];
3763
3764 if (con_back->con && con_back->con != csw) {
3765 defcsw = con_back->con;
3766 retval = 0;
3767 break;
3768 }
3769 }
3770
3771 if (retval)
3772 goto err;
3773
3774 if (!con_is_bound(csw))
3775 goto err;
3776
3777 first = max(first, con_driver->first);
3778 last = min(last, con_driver->last);
3779
3780 for (i = first; i <= last; i++) {
3781 if (con_driver_map[i] == csw) {
3782 module_put(csw->owner);
3783 con_driver_map[i] = NULL;
3784 }
3785 }
3786
3787 if (!con_is_bound(defcsw)) {
3788 const struct consw *defconsw = conswitchp;
3789
3790 defcsw->con_startup();
3791 con_back->flag |= CON_DRIVER_FLAG_INIT;
3792 /*
3793 * vgacon may change the default driver to point
3794 * to dummycon, we restore it here...
3795 */
3796 conswitchp = defconsw;
3797 }
3798
3799 if (!con_is_bound(csw))
3800 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3801
3802 /* ignore return value, binding should not fail */
3803 do_bind_con_driver(defcsw, first, last, deflt);
3804err:
3805 module_put(owner);
3806 return retval;
3807
3808}
3809EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3810
3811static int vt_bind(struct con_driver *con)
3812{
3813 const struct consw *defcsw = NULL, *csw = NULL;
3814 int i, more = 1, first = -1, last = -1, deflt = 0;
3815
3816 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3817 goto err;
3818
3819 csw = con->con;
3820
3821 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3822 struct con_driver *con = ®istered_con_driver[i];
3823
3824 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3825 defcsw = con->con;
3826 break;
3827 }
3828 }
3829
3830 if (!defcsw)
3831 goto err;
3832
3833 while (more) {
3834 more = 0;
3835
3836 for (i = con->first; i <= con->last; i++) {
3837 if (con_driver_map[i] == defcsw) {
3838 if (first == -1)
3839 first = i;
3840 last = i;
3841 more = 1;
3842 } else if (first != -1)
3843 break;
3844 }
3845
3846 if (first == 0 && last == MAX_NR_CONSOLES -1)
3847 deflt = 1;
3848
3849 if (first != -1)
3850 do_bind_con_driver(csw, first, last, deflt);
3851
3852 first = -1;
3853 last = -1;
3854 deflt = 0;
3855 }
3856
3857err:
3858 return 0;
3859}
3860
3861static int vt_unbind(struct con_driver *con)
3862{
3863 const struct consw *csw = NULL;
3864 int i, more = 1, first = -1, last = -1, deflt = 0;
3865 int ret;
3866
3867 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3868 goto err;
3869
3870 csw = con->con;
3871
3872 while (more) {
3873 more = 0;
3874
3875 for (i = con->first; i <= con->last; i++) {
3876 if (con_driver_map[i] == csw) {
3877 if (first == -1)
3878 first = i;
3879 last = i;
3880 more = 1;
3881 } else if (first != -1)
3882 break;
3883 }
3884
3885 if (first == 0 && last == MAX_NR_CONSOLES -1)
3886 deflt = 1;
3887
3888 if (first != -1) {
3889 ret = do_unbind_con_driver(csw, first, last, deflt);
3890 if (ret != 0)
3891 return ret;
3892 }
3893
3894 first = -1;
3895 last = -1;
3896 deflt = 0;
3897 }
3898
3899err:
3900 return 0;
3901}
3902#else
3903static inline int vt_bind(struct con_driver *con)
3904{
3905 return 0;
3906}
3907static inline int vt_unbind(struct con_driver *con)
3908{
3909 return 0;
3910}
3911#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3912
3913static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3914 const char *buf, size_t count)
3915{
3916 struct con_driver *con = dev_get_drvdata(dev);
3917 int bind = simple_strtoul(buf, NULL, 0);
3918
3919 console_lock();
3920
3921 if (bind)
3922 vt_bind(con);
3923 else
3924 vt_unbind(con);
3925
3926 console_unlock();
3927
3928 return count;
3929}
3930
3931static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3932 char *buf)
3933{
3934 struct con_driver *con = dev_get_drvdata(dev);
3935 int bind;
3936
3937 console_lock();
3938 bind = con_is_bound(con->con);
3939 console_unlock();
3940
3941 return sysfs_emit(buf, "%i\n", bind);
3942}
3943
3944static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3945 char *buf)
3946{
3947 struct con_driver *con = dev_get_drvdata(dev);
3948
3949 return sysfs_emit(buf, "%s %s\n",
3950 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3951 con->desc);
3952
3953}
3954
3955static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3956static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3957
3958static struct attribute *con_dev_attrs[] = {
3959 &dev_attr_bind.attr,
3960 &dev_attr_name.attr,
3961 NULL
3962};
3963
3964ATTRIBUTE_GROUPS(con_dev);
3965
3966static int vtconsole_init_device(struct con_driver *con)
3967{
3968 con->flag |= CON_DRIVER_FLAG_ATTR;
3969 return 0;
3970}
3971
3972static void vtconsole_deinit_device(struct con_driver *con)
3973{
3974 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3975}
3976
3977/**
3978 * con_is_bound - checks if driver is bound to the console
3979 * @csw: console driver
3980 *
3981 * RETURNS: zero if unbound, nonzero if bound
3982 *
3983 * Drivers can call this and if zero, they should release
3984 * all resources allocated on con_startup()
3985 */
3986int con_is_bound(const struct consw *csw)
3987{
3988 int i, bound = 0;
3989
3990 WARN_CONSOLE_UNLOCKED();
3991
3992 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3993 if (con_driver_map[i] == csw) {
3994 bound = 1;
3995 break;
3996 }
3997 }
3998
3999 return bound;
4000}
4001EXPORT_SYMBOL(con_is_bound);
4002
4003/**
4004 * con_is_visible - checks whether the current console is visible
4005 * @vc: virtual console
4006 *
4007 * RETURNS: zero if not visible, nonzero if visible
4008 */
4009bool con_is_visible(const struct vc_data *vc)
4010{
4011 WARN_CONSOLE_UNLOCKED();
4012
4013 return *vc->vc_display_fg == vc;
4014}
4015EXPORT_SYMBOL(con_is_visible);
4016
4017/**
4018 * con_debug_enter - prepare the console for the kernel debugger
4019 * @vc: virtual console
4020 *
4021 * Called when the console is taken over by the kernel debugger, this
4022 * function needs to save the current console state, then put the console
4023 * into a state suitable for the kernel debugger.
4024 *
4025 * RETURNS:
4026 * Zero on success, nonzero if a failure occurred when trying to prepare
4027 * the console for the debugger.
4028 */
4029int con_debug_enter(struct vc_data *vc)
4030{
4031 int ret = 0;
4032
4033 saved_fg_console = fg_console;
4034 saved_last_console = last_console;
4035 saved_want_console = want_console;
4036 saved_vc_mode = vc->vc_mode;
4037 saved_console_blanked = console_blanked;
4038 vc->vc_mode = KD_TEXT;
4039 console_blanked = 0;
4040 if (vc->vc_sw->con_debug_enter)
4041 ret = vc->vc_sw->con_debug_enter(vc);
4042#ifdef CONFIG_KGDB_KDB
4043 /* Set the initial LINES variable if it is not already set */
4044 if (vc->vc_rows < 999) {
4045 int linecount;
4046 char lns[4];
4047 const char *setargs[3] = {
4048 "set",
4049 "LINES",
4050 lns,
4051 };
4052 if (kdbgetintenv(setargs[0], &linecount)) {
4053 snprintf(lns, 4, "%i", vc->vc_rows);
4054 kdb_set(2, setargs);
4055 }
4056 }
4057 if (vc->vc_cols < 999) {
4058 int colcount;
4059 char cols[4];
4060 const char *setargs[3] = {
4061 "set",
4062 "COLUMNS",
4063 cols,
4064 };
4065 if (kdbgetintenv(setargs[0], &colcount)) {
4066 snprintf(cols, 4, "%i", vc->vc_cols);
4067 kdb_set(2, setargs);
4068 }
4069 }
4070#endif /* CONFIG_KGDB_KDB */
4071 return ret;
4072}
4073EXPORT_SYMBOL_GPL(con_debug_enter);
4074
4075/**
4076 * con_debug_leave - restore console state
4077 *
4078 * Restore the console state to what it was before the kernel debugger
4079 * was invoked.
4080 *
4081 * RETURNS:
4082 * Zero on success, nonzero if a failure occurred when trying to restore
4083 * the console.
4084 */
4085int con_debug_leave(void)
4086{
4087 struct vc_data *vc;
4088 int ret = 0;
4089
4090 fg_console = saved_fg_console;
4091 last_console = saved_last_console;
4092 want_console = saved_want_console;
4093 console_blanked = saved_console_blanked;
4094 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4095
4096 vc = vc_cons[fg_console].d;
4097 if (vc->vc_sw->con_debug_leave)
4098 ret = vc->vc_sw->con_debug_leave(vc);
4099 return ret;
4100}
4101EXPORT_SYMBOL_GPL(con_debug_leave);
4102
4103static int do_register_con_driver(const struct consw *csw, int first, int last)
4104{
4105 struct module *owner = csw->owner;
4106 struct con_driver *con_driver;
4107 const char *desc;
4108 int i, retval;
4109
4110 WARN_CONSOLE_UNLOCKED();
4111
4112 if (!try_module_get(owner))
4113 return -ENODEV;
4114
4115 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4116 con_driver = ®istered_con_driver[i];
4117
4118 /* already registered */
4119 if (con_driver->con == csw) {
4120 retval = -EBUSY;
4121 goto err;
4122 }
4123 }
4124
4125 desc = csw->con_startup();
4126 if (!desc) {
4127 retval = -ENODEV;
4128 goto err;
4129 }
4130
4131 retval = -EINVAL;
4132
4133 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4134 con_driver = ®istered_con_driver[i];
4135
4136 if (con_driver->con == NULL &&
4137 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4138 con_driver->con = csw;
4139 con_driver->desc = desc;
4140 con_driver->node = i;
4141 con_driver->flag = CON_DRIVER_FLAG_MODULE |
4142 CON_DRIVER_FLAG_INIT;
4143 con_driver->first = first;
4144 con_driver->last = last;
4145 retval = 0;
4146 break;
4147 }
4148 }
4149
4150 if (retval)
4151 goto err;
4152
4153 con_driver->dev =
4154 device_create_with_groups(vtconsole_class, NULL,
4155 MKDEV(0, con_driver->node),
4156 con_driver, con_dev_groups,
4157 "vtcon%i", con_driver->node);
4158 if (IS_ERR(con_driver->dev)) {
4159 pr_warn("Unable to create device for %s; errno = %ld\n",
4160 con_driver->desc, PTR_ERR(con_driver->dev));
4161 con_driver->dev = NULL;
4162 } else {
4163 vtconsole_init_device(con_driver);
4164 }
4165
4166err:
4167 module_put(owner);
4168 return retval;
4169}
4170
4171
4172/**
4173 * do_unregister_con_driver - unregister console driver from console layer
4174 * @csw: console driver
4175 *
4176 * DESCRIPTION: All drivers that registers to the console layer must
4177 * call this function upon exit, or if the console driver is in a state
4178 * where it won't be able to handle console services, such as the
4179 * framebuffer console without loaded framebuffer drivers.
4180 *
4181 * The driver must unbind first prior to unregistration.
4182 */
4183int do_unregister_con_driver(const struct consw *csw)
4184{
4185 int i;
4186
4187 /* cannot unregister a bound driver */
4188 if (con_is_bound(csw))
4189 return -EBUSY;
4190
4191 if (csw == conswitchp)
4192 return -EINVAL;
4193
4194 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4195 struct con_driver *con_driver = ®istered_con_driver[i];
4196
4197 if (con_driver->con == csw) {
4198 /*
4199 * Defer the removal of the sysfs entries since that
4200 * will acquire the kernfs s_active lock and we can't
4201 * acquire this lock while holding the console lock:
4202 * the unbind sysfs entry imposes already the opposite
4203 * order. Reset con already here to prevent any later
4204 * lookup to succeed and mark this slot as zombie, so
4205 * it won't get reused until we complete the removal
4206 * in the deferred work.
4207 */
4208 con_driver->con = NULL;
4209 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4210 schedule_work(&con_driver_unregister_work);
4211
4212 return 0;
4213 }
4214 }
4215
4216 return -ENODEV;
4217}
4218EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4219
4220static void con_driver_unregister_callback(struct work_struct *ignored)
4221{
4222 int i;
4223
4224 console_lock();
4225
4226 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4227 struct con_driver *con_driver = ®istered_con_driver[i];
4228
4229 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4230 continue;
4231
4232 console_unlock();
4233
4234 vtconsole_deinit_device(con_driver);
4235 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4236
4237 console_lock();
4238
4239 if (WARN_ON_ONCE(con_driver->con))
4240 con_driver->con = NULL;
4241 con_driver->desc = NULL;
4242 con_driver->dev = NULL;
4243 con_driver->node = 0;
4244 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4245 con_driver->flag = 0;
4246 con_driver->first = 0;
4247 con_driver->last = 0;
4248 }
4249
4250 console_unlock();
4251}
4252
4253/*
4254 * If we support more console drivers, this function is used
4255 * when a driver wants to take over some existing consoles
4256 * and become default driver for newly opened ones.
4257 *
4258 * do_take_over_console is basically a register followed by bind
4259 */
4260int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4261{
4262 int err;
4263
4264 err = do_register_con_driver(csw, first, last);
4265 /*
4266 * If we get an busy error we still want to bind the console driver
4267 * and return success, as we may have unbound the console driver
4268 * but not unregistered it.
4269 */
4270 if (err == -EBUSY)
4271 err = 0;
4272 if (!err)
4273 do_bind_con_driver(csw, first, last, deflt);
4274
4275 return err;
4276}
4277EXPORT_SYMBOL_GPL(do_take_over_console);
4278
4279
4280/*
4281 * give_up_console is a wrapper to unregister_con_driver. It will only
4282 * work if driver is fully unbound.
4283 */
4284void give_up_console(const struct consw *csw)
4285{
4286 console_lock();
4287 do_unregister_con_driver(csw);
4288 console_unlock();
4289}
4290
4291static int __init vtconsole_class_init(void)
4292{
4293 int i;
4294
4295 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4296 if (IS_ERR(vtconsole_class)) {
4297 pr_warn("Unable to create vt console class; errno = %ld\n",
4298 PTR_ERR(vtconsole_class));
4299 vtconsole_class = NULL;
4300 }
4301
4302 /* Add system drivers to sysfs */
4303 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4304 struct con_driver *con = ®istered_con_driver[i];
4305
4306 if (con->con && !con->dev) {
4307 con->dev =
4308 device_create_with_groups(vtconsole_class, NULL,
4309 MKDEV(0, con->node),
4310 con, con_dev_groups,
4311 "vtcon%i", con->node);
4312
4313 if (IS_ERR(con->dev)) {
4314 pr_warn("Unable to create device for %s; errno = %ld\n",
4315 con->desc, PTR_ERR(con->dev));
4316 con->dev = NULL;
4317 } else {
4318 vtconsole_init_device(con);
4319 }
4320 }
4321 }
4322
4323 return 0;
4324}
4325postcore_initcall(vtconsole_class_init);
4326
4327#endif
4328
4329/*
4330 * Screen blanking
4331 */
4332
4333static int set_vesa_blanking(char __user *p)
4334{
4335 unsigned int mode;
4336
4337 if (get_user(mode, p + 1))
4338 return -EFAULT;
4339
4340 vesa_blank_mode = (mode < 4) ? mode : 0;
4341 return 0;
4342}
4343
4344void do_blank_screen(int entering_gfx)
4345{
4346 struct vc_data *vc = vc_cons[fg_console].d;
4347 int i;
4348
4349 might_sleep();
4350
4351 WARN_CONSOLE_UNLOCKED();
4352
4353 if (console_blanked) {
4354 if (blank_state == blank_vesa_wait) {
4355 blank_state = blank_off;
4356 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4357 }
4358 return;
4359 }
4360
4361 /* entering graphics mode? */
4362 if (entering_gfx) {
4363 hide_cursor(vc);
4364 save_screen(vc);
4365 vc->vc_sw->con_blank(vc, -1, 1);
4366 console_blanked = fg_console + 1;
4367 blank_state = blank_off;
4368 set_origin(vc);
4369 return;
4370 }
4371
4372 blank_state = blank_off;
4373
4374 /* don't blank graphics */
4375 if (vc->vc_mode != KD_TEXT) {
4376 console_blanked = fg_console + 1;
4377 return;
4378 }
4379
4380 hide_cursor(vc);
4381 del_timer_sync(&console_timer);
4382 blank_timer_expired = 0;
4383
4384 save_screen(vc);
4385 /* In case we need to reset origin, blanking hook returns 1 */
4386 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4387 console_blanked = fg_console + 1;
4388 if (i)
4389 set_origin(vc);
4390
4391 if (console_blank_hook && console_blank_hook(1))
4392 return;
4393
4394 if (vesa_off_interval && vesa_blank_mode) {
4395 blank_state = blank_vesa_wait;
4396 mod_timer(&console_timer, jiffies + vesa_off_interval);
4397 }
4398 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4399}
4400EXPORT_SYMBOL(do_blank_screen);
4401
4402/*
4403 * Called by timer as well as from vt_console_driver
4404 */
4405void do_unblank_screen(int leaving_gfx)
4406{
4407 struct vc_data *vc;
4408
4409 /* This should now always be called from a "sane" (read: can schedule)
4410 * context for the sake of the low level drivers, except in the special
4411 * case of oops_in_progress
4412 */
4413 if (!oops_in_progress)
4414 might_sleep();
4415
4416 WARN_CONSOLE_UNLOCKED();
4417
4418 ignore_poke = 0;
4419 if (!console_blanked)
4420 return;
4421 if (!vc_cons_allocated(fg_console)) {
4422 /* impossible */
4423 pr_warn("unblank_screen: tty %d not allocated ??\n",
4424 fg_console + 1);
4425 return;
4426 }
4427 vc = vc_cons[fg_console].d;
4428 if (vc->vc_mode != KD_TEXT)
4429 return; /* but leave console_blanked != 0 */
4430
4431 if (blankinterval) {
4432 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4433 blank_state = blank_normal_wait;
4434 }
4435
4436 console_blanked = 0;
4437 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4438 /* Low-level driver cannot restore -> do it ourselves */
4439 update_screen(vc);
4440 if (console_blank_hook)
4441 console_blank_hook(0);
4442 set_palette(vc);
4443 set_cursor(vc);
4444 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4445}
4446EXPORT_SYMBOL(do_unblank_screen);
4447
4448/*
4449 * This is called by the outside world to cause a forced unblank, mostly for
4450 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4451 * call it with 1 as an argument and so force a mode restore... that may kill
4452 * X or at least garbage the screen but would also make the Oops visible...
4453 */
4454static void unblank_screen(void)
4455{
4456 do_unblank_screen(0);
4457}
4458
4459/*
4460 * We defer the timer blanking to work queue so it can take the console mutex
4461 * (console operations can still happen at irq time, but only from printk which
4462 * has the console mutex. Not perfect yet, but better than no locking
4463 */
4464static void blank_screen_t(struct timer_list *unused)
4465{
4466 blank_timer_expired = 1;
4467 schedule_work(&console_work);
4468}
4469
4470void poke_blanked_console(void)
4471{
4472 WARN_CONSOLE_UNLOCKED();
4473
4474 /* Add this so we quickly catch whoever might call us in a non
4475 * safe context. Nowadays, unblank_screen() isn't to be called in
4476 * atomic contexts and is allowed to schedule (with the special case
4477 * of oops_in_progress, but that isn't of any concern for this
4478 * function. --BenH.
4479 */
4480 might_sleep();
4481
4482 /* This isn't perfectly race free, but a race here would be mostly harmless,
4483 * at worst, we'll do a spurious blank and it's unlikely
4484 */
4485 del_timer(&console_timer);
4486 blank_timer_expired = 0;
4487
4488 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4489 return;
4490 if (console_blanked)
4491 unblank_screen();
4492 else if (blankinterval) {
4493 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4494 blank_state = blank_normal_wait;
4495 }
4496}
4497
4498/*
4499 * Palettes
4500 */
4501
4502static void set_palette(struct vc_data *vc)
4503{
4504 WARN_CONSOLE_UNLOCKED();
4505
4506 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4507 vc->vc_sw->con_set_palette(vc, color_table);
4508}
4509
4510/*
4511 * Load palette into the DAC registers. arg points to a colour
4512 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4513 */
4514
4515int con_set_cmap(unsigned char __user *arg)
4516{
4517 int i, j, k;
4518 unsigned char colormap[3*16];
4519
4520 if (copy_from_user(colormap, arg, sizeof(colormap)))
4521 return -EFAULT;
4522
4523 console_lock();
4524 for (i = k = 0; i < 16; i++) {
4525 default_red[i] = colormap[k++];
4526 default_grn[i] = colormap[k++];
4527 default_blu[i] = colormap[k++];
4528 }
4529 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4530 if (!vc_cons_allocated(i))
4531 continue;
4532 for (j = k = 0; j < 16; j++) {
4533 vc_cons[i].d->vc_palette[k++] = default_red[j];
4534 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4535 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4536 }
4537 set_palette(vc_cons[i].d);
4538 }
4539 console_unlock();
4540
4541 return 0;
4542}
4543
4544int con_get_cmap(unsigned char __user *arg)
4545{
4546 int i, k;
4547 unsigned char colormap[3*16];
4548
4549 console_lock();
4550 for (i = k = 0; i < 16; i++) {
4551 colormap[k++] = default_red[i];
4552 colormap[k++] = default_grn[i];
4553 colormap[k++] = default_blu[i];
4554 }
4555 console_unlock();
4556
4557 if (copy_to_user(arg, colormap, sizeof(colormap)))
4558 return -EFAULT;
4559
4560 return 0;
4561}
4562
4563void reset_palette(struct vc_data *vc)
4564{
4565 int j, k;
4566 for (j=k=0; j<16; j++) {
4567 vc->vc_palette[k++] = default_red[j];
4568 vc->vc_palette[k++] = default_grn[j];
4569 vc->vc_palette[k++] = default_blu[j];
4570 }
4571 set_palette(vc);
4572}
4573
4574/*
4575 * Font switching
4576 *
4577 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4578 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4579 * depending on width) reserved for each character which is kinda wasty, but
4580 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4581 * is up to the actual low-level console-driver convert data into its favorite
4582 * format (maybe we should add a `fontoffset' field to the `display'
4583 * structure so we won't have to convert the fontdata all the time.
4584 * /Jes
4585 */
4586
4587#define max_font_size 65536
4588
4589static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4590{
4591 struct console_font font;
4592 int rc = -EINVAL;
4593 int c;
4594
4595 if (op->data) {
4596 font.data = kmalloc(max_font_size, GFP_KERNEL);
4597 if (!font.data)
4598 return -ENOMEM;
4599 } else
4600 font.data = NULL;
4601
4602 console_lock();
4603 if (vc->vc_mode != KD_TEXT)
4604 rc = -EINVAL;
4605 else if (vc->vc_sw->con_font_get)
4606 rc = vc->vc_sw->con_font_get(vc, &font);
4607 else
4608 rc = -ENOSYS;
4609 console_unlock();
4610
4611 if (rc)
4612 goto out;
4613
4614 c = (font.width+7)/8 * 32 * font.charcount;
4615
4616 if (op->data && font.charcount > op->charcount)
4617 rc = -ENOSPC;
4618 if (font.width > op->width || font.height > op->height)
4619 rc = -ENOSPC;
4620 if (rc)
4621 goto out;
4622
4623 op->height = font.height;
4624 op->width = font.width;
4625 op->charcount = font.charcount;
4626
4627 if (op->data && copy_to_user(op->data, font.data, c))
4628 rc = -EFAULT;
4629
4630out:
4631 kfree(font.data);
4632 return rc;
4633}
4634
4635static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4636{
4637 struct console_font font;
4638 int rc = -EINVAL;
4639 int size;
4640
4641 if (vc->vc_mode != KD_TEXT)
4642 return -EINVAL;
4643 if (!op->data)
4644 return -EINVAL;
4645 if (op->charcount > 512)
4646 return -EINVAL;
4647 if (op->width <= 0 || op->width > 32 || !op->height || op->height > 32)
4648 return -EINVAL;
4649 size = (op->width+7)/8 * 32 * op->charcount;
4650 if (size > max_font_size)
4651 return -ENOSPC;
4652
4653 font.data = memdup_user(op->data, size);
4654 if (IS_ERR(font.data))
4655 return PTR_ERR(font.data);
4656
4657 font.charcount = op->charcount;
4658 font.width = op->width;
4659 font.height = op->height;
4660
4661 console_lock();
4662 if (vc->vc_mode != KD_TEXT)
4663 rc = -EINVAL;
4664 else if (vc->vc_sw->con_font_set) {
4665 if (vc_is_sel(vc))
4666 clear_selection();
4667 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4668 } else
4669 rc = -ENOSYS;
4670 console_unlock();
4671 kfree(font.data);
4672 return rc;
4673}
4674
4675static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4676{
4677 struct console_font font = {.width = op->width, .height = op->height};
4678 char name[MAX_FONT_NAME];
4679 char *s = name;
4680 int rc;
4681
4682
4683 if (!op->data)
4684 s = NULL;
4685 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4686 return -EFAULT;
4687 else
4688 name[MAX_FONT_NAME - 1] = 0;
4689
4690 console_lock();
4691 if (vc->vc_mode != KD_TEXT) {
4692 console_unlock();
4693 return -EINVAL;
4694 }
4695 if (vc->vc_sw->con_font_default) {
4696 if (vc_is_sel(vc))
4697 clear_selection();
4698 rc = vc->vc_sw->con_font_default(vc, &font, s);
4699 } else
4700 rc = -ENOSYS;
4701 console_unlock();
4702 if (!rc) {
4703 op->width = font.width;
4704 op->height = font.height;
4705 }
4706 return rc;
4707}
4708
4709int con_font_op(struct vc_data *vc, struct console_font_op *op)
4710{
4711 switch (op->op) {
4712 case KD_FONT_OP_SET:
4713 return con_font_set(vc, op);
4714 case KD_FONT_OP_GET:
4715 return con_font_get(vc, op);
4716 case KD_FONT_OP_SET_DEFAULT:
4717 return con_font_default(vc, op);
4718 case KD_FONT_OP_COPY:
4719 /* was buggy and never really used */
4720 return -EINVAL;
4721 }
4722 return -ENOSYS;
4723}
4724
4725/*
4726 * Interface exported to selection and vcs.
4727 */
4728
4729/* used by selection */
4730u16 screen_glyph(const struct vc_data *vc, int offset)
4731{
4732 u16 w = scr_readw(screenpos(vc, offset, true));
4733 u16 c = w & 0xff;
4734
4735 if (w & vc->vc_hi_font_mask)
4736 c |= 0x100;
4737 return c;
4738}
4739EXPORT_SYMBOL_GPL(screen_glyph);
4740
4741u32 screen_glyph_unicode(const struct vc_data *vc, int n)
4742{
4743 struct uni_screen *uniscr = get_vc_uniscr(vc);
4744
4745 if (uniscr)
4746 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4747 return inverse_translate(vc, screen_glyph(vc, n * 2), true);
4748}
4749EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4750
4751/* used by vcs - note the word offset */
4752unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
4753{
4754 return screenpos(vc, 2 * w_offset, viewed);
4755}
4756EXPORT_SYMBOL_GPL(screen_pos);
4757
4758void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
4759{
4760 /* clamp values if they don't fit */
4761 xy[0] = min(vc->state.x, 0xFFu);
4762 xy[1] = min(vc->state.y, 0xFFu);
4763}
4764
4765void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
4766{
4767 hide_cursor(vc);
4768 gotoxy(vc, xy[0], xy[1]);
4769 set_cursor(vc);
4770}
4771
4772u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
4773{
4774 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4775 return softcursor_original;
4776 return scr_readw(org);
4777}
4778
4779void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4780{
4781 scr_writew(val, org);
4782 if ((unsigned long)org == vc->vc_pos) {
4783 softcursor_original = -1;
4784 add_softcursor(vc);
4785 }
4786}
4787
4788void vcs_scr_updated(struct vc_data *vc)
4789{
4790 notify_update(vc);
4791}
4792
4793void vc_scrolldelta_helper(struct vc_data *c, int lines,
4794 unsigned int rolled_over, void *base, unsigned int size)
4795{
4796 unsigned long ubase = (unsigned long)base;
4797 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4798 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4799 ptrdiff_t origin = (void *)c->vc_origin - base;
4800 int margin = c->vc_size_row * 4;
4801 int from, wrap, from_off, avail;
4802
4803 /* Turn scrollback off */
4804 if (!lines) {
4805 c->vc_visible_origin = c->vc_origin;
4806 return;
4807 }
4808
4809 /* Do we have already enough to allow jumping from 0 to the end? */
4810 if (rolled_over > scr_end + margin) {
4811 from = scr_end;
4812 wrap = rolled_over + c->vc_size_row;
4813 } else {
4814 from = 0;
4815 wrap = size;
4816 }
4817
4818 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4819 avail = (origin - from + wrap) % wrap;
4820
4821 /* Only a little piece would be left? Show all incl. the piece! */
4822 if (avail < 2 * margin)
4823 margin = 0;
4824 if (from_off < margin)
4825 from_off = 0;
4826 if (from_off > avail - margin)
4827 from_off = avail;
4828
4829 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4830}
4831EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4832
4833/*
4834 * Visible symbols for modules
4835 */
4836
4837EXPORT_SYMBOL(color_table);
4838EXPORT_SYMBOL(default_red);
4839EXPORT_SYMBOL(default_grn);
4840EXPORT_SYMBOL(default_blu);
4841EXPORT_SYMBOL(update_region);
4842EXPORT_SYMBOL(redraw_screen);
4843EXPORT_SYMBOL(vc_resize);
4844EXPORT_SYMBOL(fg_console);
4845EXPORT_SYMBOL(console_blank_hook);
4846EXPORT_SYMBOL(console_blanked);
4847EXPORT_SYMBOL(vc_cons);
4848EXPORT_SYMBOL(global_cursor_default);
4849#ifndef VT_SINGLE_DRIVER
4850EXPORT_SYMBOL(give_up_console);
4851#endif