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tty: vgacon+sisusb, move scrolldelta to a common helper
[linux-2.6-block.git] / drivers / tty / vt / vt.c
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1da177e4 1/*
1da177e4
LT		 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
e1f8e874 60 * deletion SMP-safe. 17Jun00, Andrew Morton
1da177e4
LT		 61 *
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
d4328b40
AT		 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
1da177e4
LT		 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>
c831c338 87#include <linux/mutex.h>
1da177e4
LT		 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>
1da177e4 95#include <linux/workqueue.h>
1da177e4
LT		 96#include <linux/pm.h>
97#include <linux/font.h>
98#include <linux/bitops.h>
b293d758 99#include <linux/notifier.h>
d81ed103
AC		 100#include <linux/device.h>
101#include <linux/io.h>
d81ed103 102#include <linux/uaccess.h>
81d44507 103#include <linux/kdb.h>
74c807ce 104#include <linux/ctype.h>
1da177e4 105
3e795de7 106#define MAX_NR_CON_DRIVER 16
1da177e4 107
6db4063c 108#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 109#define CON_DRIVER_FLAG_INIT 2
110#define CON_DRIVER_FLAG_ATTR 4
d364b5c3 111#define CON_DRIVER_FLAG_ZOMBIE 8
3e795de7
AD		 112
113struct con_driver {
114 const struct consw *con;
115 const char *desc;
805952a8 116 struct device *dev;
6db4063c 117 int node;
3e795de7
AD		 118 int first;
119 int last;
120 int flag;
121};
122
123static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 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)
bd63364c 139#define DEFAULT_CURSOR_BLINK_MS 200
1da177e4 140
1da177e4
LT		 141struct vc vc_cons [MAX_NR_CONSOLES];
142
143#ifndef VT_SINGLE_DRIVER
144static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145#endif
146
147static int con_open(struct tty_struct *, struct file *);
148static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151static void save_cur(struct vc_data *vc);
152static void reset_terminal(struct vc_data *vc, int do_clear);
153static void con_flush_chars(struct tty_struct *tty);
403aac96 154static int set_vesa_blanking(char __user *p);
1da177e4
LT		 155static void set_cursor(struct vc_data *vc);
156static void hide_cursor(struct vc_data *vc);
65f27f38 157static void console_callback(struct work_struct *ignored);
d364b5c3 158static void con_driver_unregister_callback(struct work_struct *ignored);
1da177e4
LT		 159static void blank_screen_t(unsigned long dummy);
160static void set_palette(struct vc_data *vc);
161
52c40fca
PH		 162#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
163
1da177e4 164static int printable; /* Is console ready for printing? */
77bf2bab 165int default_utf8 = true;
042f10ec 166module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 167int global_cursor_default = -1;
168module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 169
9ea9a886
CL		 170static int cur_default = CUR_DEFAULT;
171module_param(cur_default, int, S_IRUGO | S_IWUSR);
172
1da177e4
LT		 173/*
174 * ignore_poke: don't unblank the screen when things are typed. This is
175 * mainly for the privacy of braille terminal users.
176 */
177static int ignore_poke;
178
179int do_poke_blanked_console;
180int console_blanked;
181
182static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 183static int vesa_off_interval;
f324edc8
DM		 184static int blankinterval = 10*60;
185core_param(consoleblank, blankinterval, int, 0444);
1da177e4 186
65f27f38 187static DECLARE_WORK(console_work, console_callback);
d364b5c3 188static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
1da177e4
LT		 189
190/*
191 * fg_console is the current virtual console,
192 * last_console is the last used one,
193 * want_console is the console we want to switch to,
b45cfba4 194 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 195 */
196int fg_console;
197int last_console;
198int want_console = -1;
fed891c8
JW		 199static int saved_fg_console;
200static int saved_last_console;
201static int saved_want_console;
202static int saved_vc_mode;
beed5336 203static int saved_console_blanked;
1da177e4
LT		 204
205/*
206 * For each existing display, we have a pointer to console currently visible
207 * on that display, allowing consoles other than fg_console to be refreshed
208 * appropriately. Unless the low-level driver supplies its own display_fg
209 * variable, we use this one for the "master display".
210 */
211static struct vc_data *master_display_fg;
212
213/*
214 * Unfortunately, we need to delay tty echo when we're currently writing to the
215 * console since the code is (and always was) not re-entrant, so we schedule
216 * all flip requests to process context with schedule-task() and run it from
217 * console_callback().
218 */
219
220/*
221 * For the same reason, we defer scrollback to the console callback.
222 */
223static int scrollback_delta;
224
225/*
226 * Hook so that the power management routines can (un)blank
227 * the console on our behalf.
228 */
229int (*console_blank_hook)(int);
230
40565f19 231static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
1da177e4
LT		 232static int blank_state;
233static int blank_timer_expired;
234enum {
235 blank_off = 0,
236 blank_normal_wait,
237 blank_vesa_wait,
238};
239
fbc92a34
KS		 240/*
241 * /sys/class/tty/tty0/
242 *
243 * the attribute 'active' contains the name of the current vc
244 * console and it supports poll() to detect vc switches
245 */
246static struct device *tty0dev;
247
b293d758
ST		 248/*
249 * Notifier list for console events.
250 */
251static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
252
253int register_vt_notifier(struct notifier_block *nb)
254{
255 return atomic_notifier_chain_register(&vt_notifier_list, nb);
256}
257EXPORT_SYMBOL_GPL(register_vt_notifier);
258
259int unregister_vt_notifier(struct notifier_block *nb)
260{
261 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
262}
263EXPORT_SYMBOL_GPL(unregister_vt_notifier);
264
265static void notify_write(struct vc_data *vc, unsigned int unicode)
266{
502fcb79 267 struct vt_notifier_param param = { .vc = vc, .c = unicode };
b293d758
ST		 268 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
269}
270
271static void notify_update(struct vc_data *vc)
272{
273 struct vt_notifier_param param = { .vc = vc };
274 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
275}
1da177e4
LT		 276/*
277 * Low-Level Functions
278 */
279
6ca8dfd7
JS		 280static inline bool con_is_fg(const struct vc_data *vc)
281{
282 return vc->vc_num == fg_console;
283}
284
285static inline bool con_should_update(const struct vc_data *vc)
286{
287 return con_is_visible(vc) && !console_blanked;
288}
1da177e4
LT		 289
290static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
291{
292 unsigned short *p;
293
294 if (!viewed)
295 p = (unsigned short *)(vc->vc_origin + offset);
296 else if (!vc->vc_sw->con_screen_pos)
297 p = (unsigned short *)(vc->vc_visible_origin + offset);
298 else
299 p = vc->vc_sw->con_screen_pos(vc, offset);
300 return p;
301}
302
e33ac1c1 303/* Called from the keyboard irq path.. */
1da177e4
LT		 304static inline void scrolldelta(int lines)
305{
e33ac1c1
AC		 306 /* FIXME */
307 /* scrolldelta needs some kind of consistency lock, but the BKL was
308 and still is not protecting versus the scheduled back end */
1da177e4
LT		 309 scrollback_delta += lines;
310 schedule_console_callback();
311}
312
313void schedule_console_callback(void)
314{
315 schedule_work(&console_work);
316}
317
89765b94
JS		 318static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
319 enum con_scroll dir, unsigned int nr)
1da177e4 320{
89765b94 321 u16 *clear, *d, *s;
1da177e4 322
89765b94 323 if (t + nr >= b)
1da177e4
LT		 324 nr = b - t - 1;
325 if (b > vc->vc_rows || t >= b || nr < 1)
326 return;
89765b94 327 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
1da177e4 328 return;
1da177e4 329
89765b94
JS		 330 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
331 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
1da177e4 332
89765b94
JS		 333 if (dir == SM_UP) {
334 clear = s + (b - t - nr) * vc->vc_cols;
335 swap(s, d);
336 }
337 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
338 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
1da177e4
LT		 339}
340
341static void do_update_region(struct vc_data *vc, unsigned long start, int count)
342{
1da177e4
LT		 343 unsigned int xx, yy, offset;
344 u16 *p;
345
346 p = (u16 *) start;
347 if (!vc->vc_sw->con_getxy) {
348 offset = (start - vc->vc_origin) / 2;
349 xx = offset % vc->vc_cols;
350 yy = offset / vc->vc_cols;
351 } else {
352 int nxx, nyy;
353 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
354 xx = nxx; yy = nyy;
355 }
356 for(;;) {
357 u16 attrib = scr_readw(p) & 0xff00;
358 int startx = xx;
359 u16 *q = p;
360 while (xx < vc->vc_cols && count) {
361 if (attrib != (scr_readw(p) & 0xff00)) {
362 if (p > q)
363 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
364 startx = xx;
365 q = p;
366 attrib = scr_readw(p) & 0xff00;
367 }
368 p++;
369 xx++;
370 count--;
371 }
372 if (p > q)
373 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
374 if (!count)
375 break;
376 xx = 0;
377 yy++;
378 if (vc->vc_sw->con_getxy) {
379 p = (u16 *)start;
380 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
381 }
382 }
1da177e4
LT		 383}
384
385void update_region(struct vc_data *vc, unsigned long start, int count)
386{
387 WARN_CONSOLE_UNLOCKED();
388
6ca8dfd7 389 if (con_should_update(vc)) {
1da177e4
LT		 390 hide_cursor(vc);
391 do_update_region(vc, start, count);
392 set_cursor(vc);
393 }
394}
395
396/* Structure of attributes is hardware-dependent */
397
fa6ce9ab
JE		 398static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
399 u8 _underline, u8 _reverse, u8 _italic)
1da177e4
LT		 400{
401 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 402 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
403 _blink, _underline, _reverse, _italic);
1da177e4 404
1da177e4
LT		 405/*
406 * ++roman: I completely changed the attribute format for monochrome
407 * mode (!can_do_color). The formerly used MDA (monochrome display
408 * adapter) format didn't allow the combination of certain effects.
409 * Now the attribute is just a bit vector:
410 * Bit 0..1: intensity (0..2)
411 * Bit 2 : underline
412 * Bit 3 : reverse
413 * Bit 7 : blink
414 */
415 {
c9e587ab 416 u8 a = _color;
1da177e4
LT		 417 if (!vc->vc_can_do_color)
418 return _intensity |
fa6ce9ab 419 (_italic ? 2 : 0) |
1da177e4
LT		 420 (_underline ? 4 : 0) |
421 (_reverse ? 8 : 0) |
422 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 423 if (_italic)
424 a = (a & 0xF0) | vc->vc_itcolor;
425 else if (_underline)
1da177e4
LT		 426 a = (a & 0xf0) | vc->vc_ulcolor;
427 else if (_intensity == 0)
428 a = (a & 0xf0) | vc->vc_ulcolor;
429 if (_reverse)
430 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
431 if (_blink)
432 a ^= 0x80;
433 if (_intensity == 2)
434 a ^= 0x08;
435 if (vc->vc_hi_font_mask == 0x100)
436 a <<= 1;
437 return a;
438 }
1da177e4
LT		 439}
440
441static void update_attr(struct vc_data *vc)
442{
fa6ce9ab
JE		 443 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
444 vc->vc_blink, vc->vc_underline,
445 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
446 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 447}
448
449/* Note: inverting the screen twice should revert to the original state */
450void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
451{
452 unsigned short *p;
453
454 WARN_CONSOLE_UNLOCKED();
455
456 count /= 2;
457 p = screenpos(vc, offset, viewed);
6af39ed3 458 if (vc->vc_sw->con_invert_region) {
1da177e4 459 vc->vc_sw->con_invert_region(vc, p, count);
6af39ed3 460 } else {
1da177e4
LT		 461 u16 *q = p;
462 int cnt = count;
463 u16 a;
464
465 if (!vc->vc_can_do_color) {
466 while (cnt--) {
467 a = scr_readw(q);
468 a ^= 0x0800;
469 scr_writew(a, q);
470 q++;
471 }
472 } else if (vc->vc_hi_font_mask == 0x100) {
473 while (cnt--) {
474 a = scr_readw(q);
475 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
476 scr_writew(a, q);
477 q++;
478 }
479 } else {
480 while (cnt--) {
481 a = scr_readw(q);
482 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
483 scr_writew(a, q);
484 q++;
485 }
486 }
487 }
6af39ed3 488
6ca8dfd7 489 if (con_should_update(vc))
1da177e4 490 do_update_region(vc, (unsigned long) p, count);
19e3ae6b 491 notify_update(vc);
1da177e4
LT		 492}
493
494/* used by selection: complement pointer position */
495void complement_pos(struct vc_data *vc, int offset)
496{
414edcd3 497 static int old_offset = -1;
1da177e4
LT		 498 static unsigned short old;
499 static unsigned short oldx, oldy;
500
501 WARN_CONSOLE_UNLOCKED();
502
414edcd3
AD		 503 if (old_offset != -1 && old_offset >= 0 &&
504 old_offset < vc->vc_screenbuf_size) {
505 scr_writew(old, screenpos(vc, old_offset, 1));
6ca8dfd7 506 if (con_should_update(vc))
1da177e4 507 vc->vc_sw->con_putc(vc, old, oldy, oldx);
19e3ae6b 508 notify_update(vc);
1da177e4 509 }
414edcd3
AD		 510
511 old_offset = offset;
512
513 if (offset != -1 && offset >= 0 &&
514 offset < vc->vc_screenbuf_size) {
1da177e4 515 unsigned short new;
414edcd3 516 unsigned short *p;
1da177e4
LT		 517 p = screenpos(vc, offset, 1);
518 old = scr_readw(p);
519 new = old ^ vc->vc_complement_mask;
520 scr_writew(new, p);
6ca8dfd7 521 if (con_should_update(vc)) {
1da177e4
LT		 522 oldx = (offset >> 1) % vc->vc_cols;
523 oldy = (offset >> 1) / vc->vc_cols;
524 vc->vc_sw->con_putc(vc, new, oldy, oldx);
525 }
19e3ae6b 526 notify_update(vc);
1da177e4
LT		 527 }
528}
529
530static void insert_char(struct vc_data *vc, unsigned int nr)
531{
81732c3b 532 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 533
a883b70d 534 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b 535 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
1da177e4 536 vc->vc_need_wrap = 0;
6ca8dfd7 537 if (con_should_update(vc))
81732c3b 538 do_update_region(vc, (unsigned long) p,
b1a925f4 539 vc->vc_cols - vc->vc_x);
1da177e4
LT		 540}
541
542static void delete_char(struct vc_data *vc, unsigned int nr)
543{
81732c3b 544 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 545
b1a925f4 546 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b
JFM		 547 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
548 nr * 2);
1da177e4 549 vc->vc_need_wrap = 0;
6ca8dfd7 550 if (con_should_update(vc))
81732c3b 551 do_update_region(vc, (unsigned long) p,
b1a925f4 552 vc->vc_cols - vc->vc_x);
1da177e4
LT		 553}
554
e882f715 555static int softcursor_original = -1;
1da177e4
LT		 556
557static void add_softcursor(struct vc_data *vc)
558{
559 int i = scr_readw((u16 *) vc->vc_pos);
560 u32 type = vc->vc_cursor_type;
561
562 if (! (type & 0x10)) return;
563 if (softcursor_original != -1) return;
564 softcursor_original = i;
565 i |= ((type >> 8) & 0xff00 );
566 i ^= ((type) & 0xff00 );
567 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
568 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
569 scr_writew(i, (u16 *) vc->vc_pos);
6ca8dfd7 570 if (con_should_update(vc))
1da177e4
LT		 571 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
572}
573
574static void hide_softcursor(struct vc_data *vc)
575{
576 if (softcursor_original != -1) {
577 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
6ca8dfd7 578 if (con_should_update(vc))
1da177e4
LT		 579 vc->vc_sw->con_putc(vc, softcursor_original,
580 vc->vc_y, vc->vc_x);
581 softcursor_original = -1;
582 }
583}
584
585static void hide_cursor(struct vc_data *vc)
586{
587 if (vc == sel_cons)
588 clear_selection();
589 vc->vc_sw->con_cursor(vc, CM_ERASE);
590 hide_softcursor(vc);
591}
592
593static void set_cursor(struct vc_data *vc)
594{
6ca8dfd7 595 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
1da177e4
LT		 596 return;
597 if (vc->vc_deccm) {
598 if (vc == sel_cons)
599 clear_selection();
600 add_softcursor(vc);
601 if ((vc->vc_cursor_type & 0x0f) != 1)
602 vc->vc_sw->con_cursor(vc, CM_DRAW);
603 } else
604 hide_cursor(vc);
605}
606
607static void set_origin(struct vc_data *vc)
608{
609 WARN_CONSOLE_UNLOCKED();
610
6ca8dfd7 611 if (!con_is_visible(vc) ||
1da177e4
LT		 612 !vc->vc_sw->con_set_origin ||
613 !vc->vc_sw->con_set_origin(vc))
614 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
615 vc->vc_visible_origin = vc->vc_origin;
616 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
617 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
618}
619
c0f160a7 620static void save_screen(struct vc_data *vc)
1da177e4
LT		 621{
622 WARN_CONSOLE_UNLOCKED();
623
624 if (vc->vc_sw->con_save_screen)
625 vc->vc_sw->con_save_screen(vc);
626}
627
628/*
629 * Redrawing of screen
630 */
631
2a248307 632void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 633{
634 unsigned short *p = (unsigned short *)vc->vc_origin;
635 int count = vc->vc_screenbuf_size / 2;
636 int mask = vc->vc_hi_font_mask | 0xff;
637
638 for (; count > 0; count--, p++) {
639 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
640 }
641}
642
643void redraw_screen(struct vc_data *vc, int is_switch)
644{
645 int redraw = 0;
646
647 WARN_CONSOLE_UNLOCKED();
648
649 if (!vc) {
650 /* strange ... */
651 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
652 return;
653 }
654
655 if (is_switch) {
656 struct vc_data *old_vc = vc_cons[fg_console].d;
657 if (old_vc == vc)
658 return;
6ca8dfd7 659 if (!con_is_visible(vc))
1da177e4
LT		 660 redraw = 1;
661 *vc->vc_display_fg = vc;
662 fg_console = vc->vc_num;
663 hide_cursor(old_vc);
6ca8dfd7 664 if (!con_is_visible(old_vc)) {
1da177e4
LT		 665 save_screen(old_vc);
666 set_origin(old_vc);
667 }
fbc92a34
KS		 668 if (tty0dev)
669 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 670 } else {
671 hide_cursor(vc);
672 redraw = 1;
673 }
674
675 if (redraw) {
676 int update;
677 int old_was_color = vc->vc_can_do_color;
678
679 set_origin(vc);
680 update = vc->vc_sw->con_switch(vc);
681 set_palette(vc);
682 /*
683 * If console changed from mono<->color, the best we can do
684 * is to clear the buffer attributes. As it currently stands,
685 * rebuilding new attributes from the old buffer is not doable
686 * without overly complex code.
687 */
688 if (old_was_color != vc->vc_can_do_color) {
689 update_attr(vc);
690 clear_buffer_attributes(vc);
691 }
8fd4bd22
JB		 692
693 /* Forcibly update if we're panicing */
694 if ((update && vc->vc_mode != KD_GRAPHICS) ||
695 vt_force_oops_output(vc))
1da177e4
LT		 696 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
697 }
698 set_cursor(vc);
699 if (is_switch) {
700 set_leds();
701 compute_shiftstate();
8182ec49 702 notify_update(vc);
1da177e4
LT		 703 }
704}
705
706/*
707 * Allocation, freeing and resizing of VTs.
708 */
709
710int vc_cons_allocated(unsigned int i)
711{
712 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
713}
714
715static void visual_init(struct vc_data *vc, int num, int init)
716{
717 /* ++Geert: vc->vc_sw->con_init determines console size */
718 if (vc->vc_sw)
719 module_put(vc->vc_sw->owner);
720 vc->vc_sw = conswitchp;
721#ifndef VT_SINGLE_DRIVER
722 if (con_driver_map[num])
723 vc->vc_sw = con_driver_map[num];
724#endif
725 __module_get(vc->vc_sw->owner);
726 vc->vc_num = num;
727 vc->vc_display_fg = &master_display_fg;
08b33249
DZ		 728 if (vc->vc_uni_pagedir_loc)
729 con_free_unimap(vc);
1da177e4 730 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
e4bdab70 731 vc->vc_uni_pagedir = NULL;
1da177e4
LT		 732 vc->vc_hi_font_mask = 0;
733 vc->vc_complement_mask = 0;
734 vc->vc_can_do_color = 0;
8fd4bd22 735 vc->vc_panic_force_write = false;
1b45996d 736 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 737 vc->vc_sw->con_init(vc, init);
738 if (!vc->vc_complement_mask)
739 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
740 vc->vc_s_complement_mask = vc->vc_complement_mask;
741 vc->vc_size_row = vc->vc_cols << 1;
742 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
743}
744
745int vc_allocate(unsigned int currcons) /* return 0 on success */
746{
34902b7f
JS		 747 struct vt_notifier_param param;
748 struct vc_data *vc;
749
1da177e4
LT		 750 WARN_CONSOLE_UNLOCKED();
751
752 if (currcons >= MAX_NR_CONSOLES)
753 return -ENXIO;
34902b7f
JS		 754
755 if (vc_cons[currcons].d)
756 return 0;
757
758 /* due to the granularity of kmalloc, we waste some memory here */
759 /* the alloc is done in two steps, to optimize the common situation
760 of a 25x80 console (structsize=216, screenbuf_size=4000) */
761 /* although the numbers above are not valid since long ago, the
762 point is still up-to-date and the comment still has its value
763 even if only as a historical artifact. --mj, July 1998 */
764 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
765 if (!vc)
1da177e4 766 return -ENOMEM;
34902b7f
JS		 767
768 vc_cons[currcons].d = vc;
769 tty_port_init(&vc->port);
770 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
771
772 visual_init(vc, currcons, 1);
773
774 if (!*vc->vc_uni_pagedir_loc)
1da177e4 775 con_set_default_unimap(vc);
f6c06b68 776
34902b7f
JS		 777 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
778 if (!vc->vc_screenbuf)
779 goto err_free;
780
781 /* If no drivers have overridden us and the user didn't pass a
782 boot option, default to displaying the cursor */
783 if (global_cursor_default == -1)
784 global_cursor_default = 1;
785
786 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
787 vcs_make_sysfs(currcons);
788 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
f6c06b68 789
1da177e4 790 return 0;
34902b7f
JS		 791err_free:
792 kfree(vc);
793 vc_cons[currcons].d = NULL;
794 return -ENOMEM;
1da177e4
LT		 795}
796
e400b6ec
AD		 797static inline int resize_screen(struct vc_data *vc, int width, int height,
798 int user)
1da177e4
LT		 799{
800 /* Resizes the resolution of the display adapater */
801 int err = 0;
802
803 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 804 err = vc->vc_sw->con_resize(vc, width, height, user);
805
1da177e4
LT		 806 return err;
807}
808
809/*
810 * Change # of rows and columns (0 means unchanged/the size of fg_console)
811 * [this is to be used together with some user program
812 * like resize that changes the hardware videomode]
813 */
814#define VC_RESIZE_MAXCOL (32767)
815#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 816
817/**
818 * vc_do_resize - resizing method for the tty
819 * @tty: tty being resized
820 * @real_tty: real tty (different to tty if a pty/tty pair)
821 * @vc: virtual console private data
822 * @cols: columns
823 * @lines: lines
824 *
825 * Resize a virtual console, clipping according to the actual constraints.
826 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 827 * information and perform any necessary signal handling.
8c9a9dd0 828 *
6a1c0680 829 * Caller must hold the console semaphore. Takes the termios rwsem and
8c9a9dd0
AC		 830 * ctrl_lock of the tty IFF a tty is passed.
831 */
832
fc6f6238
AC		 833static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
834 unsigned int cols, unsigned int lines)
1da177e4
LT		 835{
836 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 837 unsigned long end;
f2ee4ae8 838 unsigned int old_rows, old_row_size;
1da177e4 839 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 840 unsigned int user;
1da177e4
LT		 841 unsigned short *newscreen;
842
843 WARN_CONSOLE_UNLOCKED();
844
845 if (!vc)
846 return -ENXIO;
847
e400b6ec
AD		 848 user = vc->vc_resize_user;
849 vc->vc_resize_user = 0;
850
1da177e4
LT		 851 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
852 return -EINVAL;
853
854 new_cols = (cols ? cols : vc->vc_cols);
855 new_rows = (lines ? lines : vc->vc_rows);
856 new_row_size = new_cols << 1;
857 new_screen_size = new_row_size * new_rows;
858
859 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
860 return 0;
861
5cbded58 862 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 863 if (!newscreen)
864 return -ENOMEM;
865
866 old_rows = vc->vc_rows;
1da177e4 867 old_row_size = vc->vc_size_row;
1da177e4 868
e400b6ec 869 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 870 if (err) {
871 kfree(newscreen);
872 return err;
873 }
874
875 vc->vc_rows = new_rows;
876 vc->vc_cols = new_cols;
877 vc->vc_size_row = new_row_size;
878 vc->vc_screenbuf_size = new_screen_size;
879
880 rlth = min(old_row_size, new_row_size);
881 rrem = new_row_size - rlth;
882 old_origin = vc->vc_origin;
883 new_origin = (long) newscreen;
884 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 885
886 if (vc->vc_y > new_rows) {
887 if (old_rows - vc->vc_y < new_rows) {
888 /*
889 * Cursor near the bottom, copy contents from the
890 * bottom of buffer
891 */
892 old_origin += (old_rows - new_rows) * old_row_size;
3b41dc1a
AD		 893 } else {
894 /*
895 * Cursor is in no man's land, copy 1/2 screenful
896 * from the top and bottom of cursor position
897 */
898 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
3b41dc1a 899 }
9fc2b2d0
FJ		 900 }
901
902 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4
LT		 903
904 update_attr(vc);
905
3b41dc1a
AD		 906 while (old_origin < end) {
907 scr_memcpyw((unsigned short *) new_origin,
908 (unsigned short *) old_origin, rlth);
1da177e4 909 if (rrem)
3b41dc1a
AD		 910 scr_memsetw((void *)(new_origin + rlth),
911 vc->vc_video_erase_char, rrem);
1da177e4
LT		 912 old_origin += old_row_size;
913 new_origin += new_row_size;
914 }
915 if (new_scr_end > new_origin)
3b41dc1a
AD		 916 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
917 new_scr_end - new_origin);
5c9228f0 918 kfree(vc->vc_screenbuf);
1da177e4 919 vc->vc_screenbuf = newscreen;
1da177e4
LT		 920 vc->vc_screenbuf_size = new_screen_size;
921 set_origin(vc);
922
923 /* do part of a reset_terminal() */
924 vc->vc_top = 0;
925 vc->vc_bottom = vc->vc_rows;
926 gotoxy(vc, vc->vc_x, vc->vc_y);
927 save_cur(vc);
928
8c9a9dd0
AC		 929 if (tty) {
930 /* Rewrite the requested winsize data with the actual
931 resulting sizes */
932 struct winsize ws;
1da177e4
LT		 933 memset(&ws, 0, sizeof(ws));
934 ws.ws_row = vc->vc_rows;
935 ws.ws_col = vc->vc_cols;
936 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 937 tty_do_resize(tty, &ws);
1da177e4
LT		 938 }
939
6ca8dfd7 940 if (con_is_visible(vc))
1da177e4 941 update_screen(vc);
8b92e87d 942 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 943 return err;
944}
945
8c9a9dd0
AC		 946/**
947 * vc_resize - resize a VT
948 * @vc: virtual console
949 * @cols: columns
950 * @rows: rows
951 *
952 * Resize a virtual console as seen from the console end of things. We
953 * use the common vc_do_resize methods to update the structures. The
954 * caller must hold the console sem to protect console internals and
8ce73264 955 * vc->port.tty
8c9a9dd0
AC		 956 */
957
958int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
959{
8ce73264 960 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 961}
962
963/**
964 * vt_resize - resize a VT
965 * @tty: tty to resize
8c9a9dd0
AC		 966 * @ws: winsize attributes
967 *
968 * Resize a virtual terminal. This is called by the tty layer as we
969 * register our own handler for resizing. The mutual helper does all
970 * the actual work.
971 *
972 * Takes the console sem and the called methods then take the tty
6a1c0680 973 * termios_rwsem and the tty ctrl_lock in that order.
8c9a9dd0 974 */
da2bdf9a 975static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 976{
8c9a9dd0
AC		 977 struct vc_data *vc = tty->driver_data;
978 int ret;
ca9bda00 979
ac751efa 980 console_lock();
fc6f6238 981 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 982 console_unlock();
8c9a9dd0 983 return ret;
ca9bda00 984}
1da177e4 985
421b40a6 986struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 987{
421b40a6
PH		 988 struct vc_data *vc = NULL;
989
1da177e4
LT		 990 WARN_CONSOLE_UNLOCKED();
991
992 if (vc_cons_allocated(currcons)) {
421b40a6 993 struct vt_notifier_param param;
4995f8ef 994
421b40a6 995 param.vc = vc = vc_cons[currcons].d;
b293d758 996 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 997 vcs_remove_sysfs(currcons);
1da177e4 998 vc->vc_sw->con_deinit(vc);
bde0d2c9 999 put_pid(vc->vt_pid);
d459ec0b 1000 module_put(vc->vc_sw->owner);
5c9228f0 1001 kfree(vc->vc_screenbuf);
1da177e4
LT		 1002 vc_cons[currcons].d = NULL;
1003 }
421b40a6 1004 return vc;
1da177e4
LT		 1005}
1006
1007/*
1008 * VT102 emulator
1009 */
1010
079c9534
AC		 1011#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1012#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1013#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1014
1015#define decarm VC_REPEAT
1016#define decckm VC_CKMODE
1017#define kbdapplic VC_APPLIC
1018#define lnm VC_CRLF
1019
1020/*
1021 * this is what the terminal answers to a ESC-Z or csi0c query.
1022 */
1023#define VT100ID "\033[?1;2c"
1024#define VT102ID "\033[?6c"
1025
8ede5cce 1026const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1da177e4
LT		 1027 8,12,10,14, 9,13,11,15 };
1028
1029/* the default colour table, for VGA+ colour systems */
91e74ca5
JS		 1030unsigned char default_red[] = {
1031 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1032 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1033};
1034module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1035
1036unsigned char default_grn[] = {
1037 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1038 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1039};
1040module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1041
1042unsigned char default_blu[] = {
1043 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1044 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1045};
1046module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1c2bbe6a 1047
1da177e4
LT		 1048/*
1049 * gotoxy() must verify all boundaries, because the arguments
1050 * might also be negative. If the given position is out of
1051 * bounds, the cursor is placed at the nearest margin.
1052 */
1053static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1054{
1055 int min_y, max_y;
1056
1057 if (new_x < 0)
1058 vc->vc_x = 0;
1059 else {
1060 if (new_x >= vc->vc_cols)
1061 vc->vc_x = vc->vc_cols - 1;
1062 else
1063 vc->vc_x = new_x;
1064 }
1065
1066 if (vc->vc_decom) {
1067 min_y = vc->vc_top;
1068 max_y = vc->vc_bottom;
1069 } else {
1070 min_y = 0;
1071 max_y = vc->vc_rows;
1072 }
1073 if (new_y < min_y)
1074 vc->vc_y = min_y;
1075 else if (new_y >= max_y)
1076 vc->vc_y = max_y - 1;
1077 else
1078 vc->vc_y = new_y;
1079 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1080 vc->vc_need_wrap = 0;
1081}
1082
1083/* for absolute user moves, when decom is set */
1084static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1085{
1086 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1087}
1088
1b0ec88a 1089void scrollback(struct vc_data *vc)
1da177e4 1090{
1b0ec88a 1091 scrolldelta(-(vc->vc_rows / 2));
1da177e4
LT		 1092}
1093
1094void scrollfront(struct vc_data *vc, int lines)
1095{
1096 if (!lines)
1097 lines = vc->vc_rows / 2;
1098 scrolldelta(lines);
1099}
1100
1101static void lf(struct vc_data *vc)
1102{
1103 /* don't scroll if above bottom of scrolling region, or
1104 * if below scrolling region
1105 */
1106 if (vc->vc_y + 1 == vc->vc_bottom)
89765b94 1107 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1da177e4
LT		 1108 else if (vc->vc_y < vc->vc_rows - 1) {
1109 vc->vc_y++;
1110 vc->vc_pos += vc->vc_size_row;
1111 }
1112 vc->vc_need_wrap = 0;
b293d758 1113 notify_write(vc, '\n');
1da177e4
LT		 1114}
1115
1116static void ri(struct vc_data *vc)
1117{
1118 /* don't scroll if below top of scrolling region, or
1119 * if above scrolling region
1120 */
1121 if (vc->vc_y == vc->vc_top)
89765b94 1122 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1da177e4
LT		 1123 else if (vc->vc_y > 0) {
1124 vc->vc_y--;
1125 vc->vc_pos -= vc->vc_size_row;
1126 }
1127 vc->vc_need_wrap = 0;
1128}
1129
1130static inline void cr(struct vc_data *vc)
1131{
1132 vc->vc_pos -= vc->vc_x << 1;
1133 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1134 notify_write(vc, '\r');
1da177e4
LT		 1135}
1136
1137static inline void bs(struct vc_data *vc)
1138{
1139 if (vc->vc_x) {
1140 vc->vc_pos -= 2;
1141 vc->vc_x--;
1142 vc->vc_need_wrap = 0;
b293d758 1143 notify_write(vc, '\b');
1da177e4
LT		 1144 }
1145}
1146
1147static inline void del(struct vc_data *vc)
1148{
1149 /* ignored */
1150}
1151
1152static void csi_J(struct vc_data *vc, int vpar)
1153{
1154 unsigned int count;
1155 unsigned short * start;
1156
1157 switch (vpar) {
1158 case 0: /* erase from cursor to end of display */
1159 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1160 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1161 break;
1162 case 1: /* erase from start to cursor */
1163 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1164 start = (unsigned short *)vc->vc_origin;
1da177e4 1165 break;
f8df13e0
PP		 1166 case 3: /* erase scroll-back buffer (and whole display) */
1167 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1168 vc->vc_screenbuf_size >> 1);
1169 set_origin(vc);
6ca8dfd7 1170 if (con_is_visible(vc))
0930b095 1171 update_screen(vc);
f8df13e0 1172 /* fall through */
1da177e4
LT		 1173 case 2: /* erase whole display */
1174 count = vc->vc_cols * vc->vc_rows;
1175 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1176 break;
1177 default:
1178 return;
1179 }
1180 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
6ca8dfd7 1181 if (con_should_update(vc))
81732c3b 1182 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1183 vc->vc_need_wrap = 0;
1184}
1185
1186static void csi_K(struct vc_data *vc, int vpar)
1187{
1188 unsigned int count;
1189 unsigned short * start;
1190
1191 switch (vpar) {
1192 case 0: /* erase from cursor to end of line */
1193 count = vc->vc_cols - vc->vc_x;
1194 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1195 break;
1196 case 1: /* erase from start of line to cursor */
1197 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1198 count = vc->vc_x + 1;
1da177e4
LT		 1199 break;
1200 case 2: /* erase whole line */
1201 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1202 count = vc->vc_cols;
1da177e4
LT		 1203 break;
1204 default:
1205 return;
1206 }
1207 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1208 vc->vc_need_wrap = 0;
6ca8dfd7 1209 if (con_should_update(vc))
81732c3b 1210 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1211}
1212
1213static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1214{ /* not vt100? */
1215 int count;
1216
1217 if (!vpar)
1218 vpar++;
1219 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1220
1221 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
6ca8dfd7 1222 if (con_should_update(vc))
1da177e4
LT		 1223 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1224 vc->vc_need_wrap = 0;
1225}
1226
1227static void default_attr(struct vc_data *vc)
1228{
1229 vc->vc_intensity = 1;
fa6ce9ab 1230 vc->vc_italic = 0;
1da177e4
LT		 1231 vc->vc_underline = 0;
1232 vc->vc_reverse = 0;
1233 vc->vc_blink = 0;
1234 vc->vc_color = vc->vc_def_color;
1235}
1236
cec5b2a9
AB		 1237struct rgb { u8 r; u8 g; u8 b; };
1238
0f91e142 1239static void rgb_from_256(int i, struct rgb *c)
cec5b2a9 1240{
cec5b2a9 1241 if (i < 8) { /* Standard colours. */
0f91e142
JS		 1242 c->r = i&1 ? 0xaa : 0x00;
1243 c->g = i&2 ? 0xaa : 0x00;
1244 c->b = i&4 ? 0xaa : 0x00;
cec5b2a9 1245 } else if (i < 16) {
0f91e142
JS		 1246 c->r = i&1 ? 0xff : 0x55;
1247 c->g = i&2 ? 0xff : 0x55;
1248 c->b = i&4 ? 0xff : 0x55;
cec5b2a9 1249 } else if (i < 232) { /* 6x6x6 colour cube. */
0f91e142
JS		 1250 c->r = (i - 16) / 36 * 85 / 2;
1251 c->g = (i - 16) / 6 % 6 * 85 / 2;
1252 c->b = (i - 16) % 6 * 85 / 2;
cec5b2a9 1253 } else /* Grayscale ramp. */
0f91e142 1254 c->r = c->g = c->b = i * 10 - 2312;
cec5b2a9
AB		 1255}
1256
0f91e142 1257static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
cec5b2a9 1258{
193df022
JS		 1259 u8 hue = 0, max = max3(c->r, c->g, c->b);
1260
1261 if (c->r > max / 2)
1262 hue |= 4;
1263 if (c->g > max / 2)
1264 hue |= 2;
1265 if (c->b > max / 2)
1266 hue |= 1;
1267
1268 if (hue == 7 && max <= 0x55) {
1269 hue = 0;
1270 vc->vc_intensity = 2;
1271 } else if (max > 0xaa)
1272 vc->vc_intensity = 2;
cec5b2a9 1273 else
193df022
JS		 1274 vc->vc_intensity = 1;
1275
cec5b2a9
AB		 1276 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1277}
1278
0f91e142 1279static void rgb_background(struct vc_data *vc, const struct rgb *c)
cec5b2a9
AB		 1280{
1281 /* For backgrounds, err on the dark side. */
1282 vc->vc_color = (vc->vc_color & 0x0f)
0f91e142 1283 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
cec5b2a9
AB		 1284}
1285
e05ab238
JS		 1286/*
1287 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1288 * and thus need to be detected and ignored by hand. Strictly speaking, that
1289 * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1290 * no one produces such codes and almost no one accepts them.
1291 *
1292 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1293 * supporting them.
1294 */
1295static int vc_t416_color(struct vc_data *vc, int i,
0f91e142 1296 void(*set_color)(struct vc_data *vc, const struct rgb *c))
e05ab238 1297{
0f91e142
JS		 1298 struct rgb c;
1299
e05ab238
JS		 1300 i++;
1301 if (i > vc->vc_npar)
1302 return i;
1303
0bf1f4a8 1304 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
3e7ec4a0 1305 /* 256 colours */
e05ab238 1306 i++;
0f91e142 1307 rgb_from_256(vc->vc_par[i], &c);
669e0a51 1308 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
3e7ec4a0 1309 /* 24 bit */
0f91e142
JS		 1310 c.r = vc->vc_par[i + 1];
1311 c.g = vc->vc_par[i + 2];
1312 c.b = vc->vc_par[i + 3];
e05ab238 1313 i += 3;
0f91e142
JS		 1314 } else
1315 return i;
1316
1317 set_color(vc, &c);
e05ab238
JS		 1318
1319 return i;
1320}
1321
ac751efa 1322/* console_lock is held */
1da177e4
LT		 1323static void csi_m(struct vc_data *vc)
1324{
1325 int i;
1326
1327 for (i = 0; i <= vc->vc_npar; i++)
1328 switch (vc->vc_par[i]) {
aada0a34
JS		 1329 case 0: /* all attributes off */
1330 default_attr(vc);
1331 break;
1332 case 1:
1333 vc->vc_intensity = 2;
1334 break;
1335 case 2:
1336 vc->vc_intensity = 0;
1337 break;
1338 case 3:
1339 vc->vc_italic = 1;
1340 break;
1341 case 4:
1342 vc->vc_underline = 1;
1343 break;
1344 case 5:
1345 vc->vc_blink = 1;
1346 break;
1347 case 7:
1348 vc->vc_reverse = 1;
1349 break;
1350 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1351 * Select primary font, don't display control chars if
1352 * defined, don't set bit 8 on output.
1353 */
1354 vc->vc_translate = set_translate(vc->vc_charset == 0
1355 ? vc->vc_G0_charset
1356 : vc->vc_G1_charset, vc);
1357 vc->vc_disp_ctrl = 0;
1358 vc->vc_toggle_meta = 0;
1359 break;
1360 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1361 * Select first alternate font, lets chars < 32 be
1362 * displayed as ROM chars.
1363 */
1364 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1365 vc->vc_disp_ctrl = 1;
1366 vc->vc_toggle_meta = 0;
1367 break;
1368 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1369 * Select second alternate font, toggle high bit
1370 * before displaying as ROM char.
1371 */
1372 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1373 vc->vc_disp_ctrl = 1;
1374 vc->vc_toggle_meta = 1;
1375 break;
1376 case 21:
1377 case 22:
1378 vc->vc_intensity = 1;
1379 break;
1380 case 23:
1381 vc->vc_italic = 0;
1382 break;
1383 case 24:
1384 vc->vc_underline = 0;
1385 break;
1386 case 25:
1387 vc->vc_blink = 0;
1388 break;
1389 case 27:
1390 vc->vc_reverse = 0;
1391 break;
1392 case 38:
1393 i = vc_t416_color(vc, i, rgb_foreground);
1394 break;
1395 case 48:
1396 i = vc_t416_color(vc, i, rgb_background);
1397 break;
1398 case 39:
1399 vc->vc_color = (vc->vc_def_color & 0x0f) |
1400 (vc->vc_color & 0xf0);
1401 break;
1402 case 49:
1403 vc->vc_color = (vc->vc_def_color & 0xf0) |
1404 (vc->vc_color & 0x0f);
1405 break;
1406 default:
fadb4244
AB		 1407 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1408 if (vc->vc_par[i] < 100)
1409 vc->vc_intensity = 2;
cc67dc28
AB		 1410 vc->vc_par[i] -= 60;
1411 }
aada0a34
JS		 1412 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1413 vc->vc_color = color_table[vc->vc_par[i] - 30]
1414 | (vc->vc_color & 0xf0);
1415 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1416 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1417 | (vc->vc_color & 0x0f);
1418 break;
1da177e4
LT		 1419 }
1420 update_attr(vc);
1421}
1422
6732c8bb 1423static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1424{
1425 while (*p) {
6732c8bb 1426 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1427 p++;
1428 }
6732c8bb 1429 tty_schedule_flip(port);
1da177e4
LT		 1430}
1431
1432static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1433{
1434 char buf[40];
1435
1436 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1437 respond_string(buf, tty->port);
1da177e4
LT		 1438}
1439
1440static inline void status_report(struct tty_struct *tty)
1441{
6732c8bb 1442 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1443}
1444
6732c8bb 1445static inline void respond_ID(struct tty_struct *tty)
1da177e4 1446{
6732c8bb 1447 respond_string(VT102ID, tty->port);
1da177e4
LT		 1448}
1449
1450void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1451{
1452 char buf[8];
1453
1454 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1455 (char)('!' + mry));
6732c8bb 1456 respond_string(buf, tty->port);
1da177e4
LT		 1457}
1458
1459/* invoked via ioctl(TIOCLINUX) and through set_selection */
1460int mouse_reporting(void)
1461{
1462 return vc_cons[fg_console].d->vc_report_mouse;
1463}
1464
ac751efa 1465/* console_lock is held */
1da177e4
LT		 1466static void set_mode(struct vc_data *vc, int on_off)
1467{
1468 int i;
1469
1470 for (i = 0; i <= vc->vc_npar; i++)
1471 if (vc->vc_ques) {
1472 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1473 case 1: /* Cursor keys send ^[Ox/^[[x */
1474 if (on_off)
1475 set_kbd(vc, decckm);
1476 else
1477 clr_kbd(vc, decckm);
1478 break;
1479 case 3: /* 80/132 mode switch unimplemented */
1da177e4
LT		 1480#if 0
1481 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1482 /* this alone does not suffice; some user mode
1483 utility has to change the hardware regs */
1484#endif
1485 break;
1486 case 5: /* Inverted screen on/off */
1487 if (vc->vc_decscnm != on_off) {
1488 vc->vc_decscnm = on_off;
1489 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1490 update_attr(vc);
1491 }
1492 break;
1493 case 6: /* Origin relative/absolute */
1494 vc->vc_decom = on_off;
1495 gotoxay(vc, 0, 0);
1496 break;
1497 case 7: /* Autowrap on/off */
1498 vc->vc_decawm = on_off;
1499 break;
1500 case 8: /* Autorepeat on/off */
1501 if (on_off)
1502 set_kbd(vc, decarm);
1503 else
1504 clr_kbd(vc, decarm);
1505 break;
1506 case 9:
1507 vc->vc_report_mouse = on_off ? 1 : 0;
1508 break;
1509 case 25: /* Cursor on/off */
1510 vc->vc_deccm = on_off;
1511 break;
1512 case 1000:
1513 vc->vc_report_mouse = on_off ? 2 : 0;
1514 break;
1515 }
1516 } else {
1517 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1518 case 3: /* Monitor (display ctrls) */
1519 vc->vc_disp_ctrl = on_off;
1520 break;
1521 case 4: /* Insert Mode on/off */
1522 vc->vc_decim = on_off;
1523 break;
1524 case 20: /* Lf, Enter == CrLf/Lf */
1525 if (on_off)
1526 set_kbd(vc, lnm);
1527 else
1528 clr_kbd(vc, lnm);
1529 break;
1530 }
1531 }
1532}
1533
ac751efa 1534/* console_lock is held */
1da177e4
LT		 1535static void setterm_command(struct vc_data *vc)
1536{
1537 switch(vc->vc_par[0]) {
1538 case 1: /* set color for underline mode */
1539 if (vc->vc_can_do_color &&
1540 vc->vc_par[1] < 16) {
1541 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1542 if (vc->vc_underline)
1543 update_attr(vc);
1544 }
1545 break;
1546 case 2: /* set color for half intensity mode */
1547 if (vc->vc_can_do_color &&
1548 vc->vc_par[1] < 16) {
1549 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1550 if (vc->vc_intensity == 0)
1551 update_attr(vc);
1552 }
1553 break;
1554 case 8: /* store colors as defaults */
1555 vc->vc_def_color = vc->vc_attr;
1556 if (vc->vc_hi_font_mask == 0x100)
1557 vc->vc_def_color >>= 1;
1558 default_attr(vc);
1559 update_attr(vc);
1560 break;
1561 case 9: /* set blanking interval */
f324edc8 1562 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1563 poke_blanked_console();
1564 break;
1565 case 10: /* set bell frequency in Hz */
1566 if (vc->vc_npar >= 1)
1567 vc->vc_bell_pitch = vc->vc_par[1];
1568 else
1569 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1570 break;
1571 case 11: /* set bell duration in msec */
1572 if (vc->vc_npar >= 1)
1573 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
3372ec28 1574 msecs_to_jiffies(vc->vc_par[1]) : 0;
1da177e4
LT		 1575 else
1576 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1577 break;
1578 case 12: /* bring specified console to the front */
1579 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1580 set_console(vc->vc_par[1] - 1);
1581 break;
1582 case 13: /* unblank the screen */
1583 poke_blanked_console();
1584 break;
1585 case 14: /* set vesa powerdown interval */
1586 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1587 break;
1588 case 15: /* activate the previous console */
1589 set_console(last_console);
1590 break;
bd63364c
SD		 1591 case 16: /* set cursor blink duration in msec */
1592 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1593 vc->vc_par[1] <= USHRT_MAX)
1594 vc->vc_cur_blink_ms = vc->vc_par[1];
1595 else
1596 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1597 break;
1da177e4
LT		 1598 }
1599}
1600
ac751efa 1601/* console_lock is held */
1da177e4
LT		 1602static void csi_at(struct vc_data *vc, unsigned int nr)
1603{
1604 if (nr > vc->vc_cols - vc->vc_x)
1605 nr = vc->vc_cols - vc->vc_x;
1606 else if (!nr)
1607 nr = 1;
1608 insert_char(vc, nr);
1609}
1610
ac751efa 1611/* console_lock is held */
1da177e4
LT		 1612static void csi_L(struct vc_data *vc, unsigned int nr)
1613{
1614 if (nr > vc->vc_rows - vc->vc_y)
1615 nr = vc->vc_rows - vc->vc_y;
1616 else if (!nr)
1617 nr = 1;
89765b94 1618 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1da177e4
LT		 1619 vc->vc_need_wrap = 0;
1620}
1621
ac751efa 1622/* console_lock is held */
1da177e4
LT		 1623static void csi_P(struct vc_data *vc, unsigned int nr)
1624{
1625 if (nr > vc->vc_cols - vc->vc_x)
1626 nr = vc->vc_cols - vc->vc_x;
1627 else if (!nr)
1628 nr = 1;
1629 delete_char(vc, nr);
1630}
1631
ac751efa 1632/* console_lock is held */
1da177e4
LT		 1633static void csi_M(struct vc_data *vc, unsigned int nr)
1634{
1635 if (nr > vc->vc_rows - vc->vc_y)
1636 nr = vc->vc_rows - vc->vc_y;
1637 else if (!nr)
1638 nr=1;
89765b94 1639 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1da177e4
LT		 1640 vc->vc_need_wrap = 0;
1641}
1642
ac751efa 1643/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1644static void save_cur(struct vc_data *vc)
1645{
1646 vc->vc_saved_x = vc->vc_x;
1647 vc->vc_saved_y = vc->vc_y;
1648 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1649 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1650 vc->vc_s_underline = vc->vc_underline;
1651 vc->vc_s_blink = vc->vc_blink;
1652 vc->vc_s_reverse = vc->vc_reverse;
1653 vc->vc_s_charset = vc->vc_charset;
1654 vc->vc_s_color = vc->vc_color;
1655 vc->vc_saved_G0 = vc->vc_G0_charset;
1656 vc->vc_saved_G1 = vc->vc_G1_charset;
1657}
1658
ac751efa 1659/* console_lock is held */
1da177e4
LT		 1660static void restore_cur(struct vc_data *vc)
1661{
1662 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1663 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1664 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1665 vc->vc_underline = vc->vc_s_underline;
1666 vc->vc_blink = vc->vc_s_blink;
1667 vc->vc_reverse = vc->vc_s_reverse;
1668 vc->vc_charset = vc->vc_s_charset;
1669 vc->vc_color = vc->vc_s_color;
1670 vc->vc_G0_charset = vc->vc_saved_G0;
1671 vc->vc_G1_charset = vc->vc_saved_G1;
1672 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1673 update_attr(vc);
1674 vc->vc_need_wrap = 0;
1675}
1676
b290af68 1677enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1da177e4 1678 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
63f3a16d 1679 ESpalette, ESosc };
1da177e4 1680
ac751efa 1681/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1682static void reset_terminal(struct vc_data *vc, int do_clear)
1683{
1684 vc->vc_top = 0;
1685 vc->vc_bottom = vc->vc_rows;
1686 vc->vc_state = ESnormal;
1687 vc->vc_ques = 0;
1688 vc->vc_translate = set_translate(LAT1_MAP, vc);
1689 vc->vc_G0_charset = LAT1_MAP;
1690 vc->vc_G1_charset = GRAF_MAP;
1691 vc->vc_charset = 0;
1692 vc->vc_need_wrap = 0;
1693 vc->vc_report_mouse = 0;
042f10ec 1694 vc->vc_utf = default_utf8;
1da177e4
LT		 1695 vc->vc_utf_count = 0;
1696
1697 vc->vc_disp_ctrl = 0;
1698 vc->vc_toggle_meta = 0;
1699
1700 vc->vc_decscnm = 0;
1701 vc->vc_decom = 0;
1702 vc->vc_decawm = 1;
f6c06b68 1703 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1704 vc->vc_decim = 0;
1705
079c9534 1706 vt_reset_keyboard(vc->vc_num);
1da177e4 1707
9ea9a886 1708 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1709 vc->vc_complement_mask = vc->vc_s_complement_mask;
1710
1711 default_attr(vc);
1712 update_attr(vc);
1713
1714 vc->vc_tab_stop[0] = 0x01010100;
1715 vc->vc_tab_stop[1] =
1716 vc->vc_tab_stop[2] =
1717 vc->vc_tab_stop[3] =
a564738c
WK		 1718 vc->vc_tab_stop[4] =
1719 vc->vc_tab_stop[5] =
1720 vc->vc_tab_stop[6] =
1721 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1722
1723 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1724 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 1725 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1726
1727 gotoxy(vc, 0, 0);
1728 save_cur(vc);
1729 if (do_clear)
1730 csi_J(vc, 2);
1731}
1732
ac751efa 1733/* console_lock is held */
1da177e4
LT		 1734static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1735{
1736 /*
1737 * Control characters can be used in the _middle_
1738 * of an escape sequence.
1739 */
63f3a16d
AB		 1740 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1741 return;
1da177e4
LT		 1742 switch (c) {
1743 case 0:
1744 return;
1745 case 7:
63f3a16d
AB		 1746 if (vc->vc_state == ESosc)
1747 vc->vc_state = ESnormal;
1748 else if (vc->vc_bell_duration)
1da177e4
LT		 1749 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1750 return;
1751 case 8:
1752 bs(vc);
1753 return;
1754 case 9:
1755 vc->vc_pos -= (vc->vc_x << 1);
1756 while (vc->vc_x < vc->vc_cols - 1) {
1757 vc->vc_x++;
1758 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1759 break;
1760 }
1761 vc->vc_pos += (vc->vc_x << 1);
b293d758 1762 notify_write(vc, '\t');
1da177e4
LT		 1763 return;
1764 case 10: case 11: case 12:
1765 lf(vc);
1766 if (!is_kbd(vc, lnm))
1767 return;
1768 case 13:
1769 cr(vc);
1770 return;
1771 case 14:
1772 vc->vc_charset = 1;
1773 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1774 vc->vc_disp_ctrl = 1;
1775 return;
1776 case 15:
1777 vc->vc_charset = 0;
1778 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1779 vc->vc_disp_ctrl = 0;
1780 return;
1781 case 24: case 26:
1782 vc->vc_state = ESnormal;
1783 return;
1784 case 27:
1785 vc->vc_state = ESesc;
1786 return;
1787 case 127:
1788 del(vc);
1789 return;
1790 case 128+27:
1791 vc->vc_state = ESsquare;
1792 return;
1793 }
1794 switch(vc->vc_state) {
1795 case ESesc:
1796 vc->vc_state = ESnormal;
1797 switch (c) {
1798 case '[':
1799 vc->vc_state = ESsquare;
1800 return;
1801 case ']':
1802 vc->vc_state = ESnonstd;
1803 return;
1804 case '%':
1805 vc->vc_state = ESpercent;
1806 return;
1807 case 'E':
1808 cr(vc);
1809 lf(vc);
1810 return;
1811 case 'M':
1812 ri(vc);
1813 return;
1814 case 'D':
1815 lf(vc);
1816 return;
1817 case 'H':
1818 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1819 return;
1820 case 'Z':
1821 respond_ID(tty);
1822 return;
1823 case '7':
1824 save_cur(vc);
1825 return;
1826 case '8':
1827 restore_cur(vc);
1828 return;
1829 case '(':
1830 vc->vc_state = ESsetG0;
1831 return;
1832 case ')':
1833 vc->vc_state = ESsetG1;
1834 return;
1835 case '#':
1836 vc->vc_state = EShash;
1837 return;
1838 case 'c':
1839 reset_terminal(vc, 1);
1840 return;
1841 case '>': /* Numeric keypad */
1842 clr_kbd(vc, kbdapplic);
1843 return;
1844 case '=': /* Appl. keypad */
1845 set_kbd(vc, kbdapplic);
1846 return;
1847 }
1848 return;
1849 case ESnonstd:
1850 if (c=='P') { /* palette escape sequence */
1851 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1852 vc->vc_par[vc->vc_npar] = 0;
1853 vc->vc_npar = 0;
1854 vc->vc_state = ESpalette;
1855 return;
1856 } else if (c=='R') { /* reset palette */
1857 reset_palette(vc);
1858 vc->vc_state = ESnormal;
63f3a16d
AB		 1859 } else if (c>='0' && c<='9')
1860 vc->vc_state = ESosc;
1861 else
1da177e4
LT		 1862 vc->vc_state = ESnormal;
1863 return;
1864 case ESpalette:
74c807ce
AS		 1865 if (isxdigit(c)) {
1866 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1867 if (vc->vc_npar == 7) {
1868 int i = vc->vc_par[0] * 3, j = 1;
1869 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1870 vc->vc_palette[i++] += vc->vc_par[j++];
1871 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1872 vc->vc_palette[i++] += vc->vc_par[j++];
1873 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1874 vc->vc_palette[i] += vc->vc_par[j];
1875 set_palette(vc);
1876 vc->vc_state = ESnormal;
1877 }
1878 } else
1879 vc->vc_state = ESnormal;
1880 return;
1881 case ESsquare:
1882 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1883 vc->vc_par[vc->vc_npar] = 0;
1884 vc->vc_npar = 0;
1885 vc->vc_state = ESgetpars;
1886 if (c == '[') { /* Function key */
1887 vc->vc_state=ESfunckey;
1888 return;
1889 }
1890 vc->vc_ques = (c == '?');
1891 if (vc->vc_ques)
1892 return;
1893 case ESgetpars:
1894 if (c == ';' && vc->vc_npar < NPAR - 1) {
1895 vc->vc_npar++;
1896 return;
1897 } else if (c>='0' && c<='9') {
1898 vc->vc_par[vc->vc_npar] *= 10;
1899 vc->vc_par[vc->vc_npar] += c - '0';
1900 return;
b290af68 1901 }
1da177e4
LT		 1902 vc->vc_state = ESnormal;
1903 switch(c) {
1904 case 'h':
1905 set_mode(vc, 1);
1906 return;
1907 case 'l':
1908 set_mode(vc, 0);
1909 return;
1910 case 'c':
1911 if (vc->vc_ques) {
1912 if (vc->vc_par[0])
1913 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1914 else
9ea9a886 1915 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1916 return;
1917 }
1918 break;
1919 case 'm':
1920 if (vc->vc_ques) {
1921 clear_selection();
1922 if (vc->vc_par[0])
1923 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1924 else
1925 vc->vc_complement_mask = vc->vc_s_complement_mask;
1926 return;
1927 }
1928 break;
1929 case 'n':
1930 if (!vc->vc_ques) {
1931 if (vc->vc_par[0] == 5)
1932 status_report(tty);
1933 else if (vc->vc_par[0] == 6)
1934 cursor_report(vc, tty);
1935 }
1936 return;
1937 }
1938 if (vc->vc_ques) {
1939 vc->vc_ques = 0;
1940 return;
1941 }
1942 switch(c) {
1943 case 'G': case '`':
1944 if (vc->vc_par[0])
1945 vc->vc_par[0]--;
1946 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1947 return;
1948 case 'A':
1949 if (!vc->vc_par[0])
1950 vc->vc_par[0]++;
1951 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1952 return;
1953 case 'B': case 'e':
1954 if (!vc->vc_par[0])
1955 vc->vc_par[0]++;
1956 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1957 return;
1958 case 'C': case 'a':
1959 if (!vc->vc_par[0])
1960 vc->vc_par[0]++;
1961 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1962 return;
1963 case 'D':
1964 if (!vc->vc_par[0])
1965 vc->vc_par[0]++;
1966 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1967 return;
1968 case 'E':
1969 if (!vc->vc_par[0])
1970 vc->vc_par[0]++;
1971 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1972 return;
1973 case 'F':
1974 if (!vc->vc_par[0])
1975 vc->vc_par[0]++;
1976 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1977 return;
1978 case 'd':
1979 if (vc->vc_par[0])
1980 vc->vc_par[0]--;
1981 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1982 return;
1983 case 'H': case 'f':
1984 if (vc->vc_par[0])
1985 vc->vc_par[0]--;
1986 if (vc->vc_par[1])
1987 vc->vc_par[1]--;
1988 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1989 return;
1990 case 'J':
1991 csi_J(vc, vc->vc_par[0]);
1992 return;
1993 case 'K':
1994 csi_K(vc, vc->vc_par[0]);
1995 return;
1996 case 'L':
1997 csi_L(vc, vc->vc_par[0]);
1998 return;
1999 case 'M':
2000 csi_M(vc, vc->vc_par[0]);
2001 return;
2002 case 'P':
2003 csi_P(vc, vc->vc_par[0]);
2004 return;
2005 case 'c':
2006 if (!vc->vc_par[0])
2007 respond_ID(tty);
2008 return;
2009 case 'g':
2010 if (!vc->vc_par[0])
2011 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2012 else if (vc->vc_par[0] == 3) {
2013 vc->vc_tab_stop[0] =
2014 vc->vc_tab_stop[1] =
2015 vc->vc_tab_stop[2] =
2016 vc->vc_tab_stop[3] =
a564738c
WK		 2017 vc->vc_tab_stop[4] =
2018 vc->vc_tab_stop[5] =
2019 vc->vc_tab_stop[6] =
2020 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 2021 }
2022 return;
2023 case 'm':
2024 csi_m(vc);
2025 return;
2026 case 'q': /* DECLL - but only 3 leds */
2027 /* map 0,1,2,3 to 0,1,2,4 */
2028 if (vc->vc_par[0] < 4)
079c9534 2029 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2030 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2031 return;
2032 case 'r':
2033 if (!vc->vc_par[0])
2034 vc->vc_par[0]++;
2035 if (!vc->vc_par[1])
2036 vc->vc_par[1] = vc->vc_rows;
2037 /* Minimum allowed region is 2 lines */
2038 if (vc->vc_par[0] < vc->vc_par[1] &&
2039 vc->vc_par[1] <= vc->vc_rows) {
2040 vc->vc_top = vc->vc_par[0] - 1;
2041 vc->vc_bottom = vc->vc_par[1];
2042 gotoxay(vc, 0, 0);
2043 }
2044 return;
2045 case 's':
2046 save_cur(vc);
2047 return;
2048 case 'u':
2049 restore_cur(vc);
2050 return;
2051 case 'X':
2052 csi_X(vc, vc->vc_par[0]);
2053 return;
2054 case '@':
2055 csi_at(vc, vc->vc_par[0]);
2056 return;
2057 case ']': /* setterm functions */
2058 setterm_command(vc);
2059 return;
2060 }
2061 return;
2062 case ESpercent:
2063 vc->vc_state = ESnormal;
2064 switch (c) {
2065 case '@': /* defined in ISO 2022 */
2066 vc->vc_utf = 0;
2067 return;
2068 case 'G': /* prelim official escape code */
2069 case '8': /* retained for compatibility */
2070 vc->vc_utf = 1;
2071 return;
2072 }
2073 return;
2074 case ESfunckey:
2075 vc->vc_state = ESnormal;
2076 return;
2077 case EShash:
2078 vc->vc_state = ESnormal;
2079 if (c == '8') {
2080 /* DEC screen alignment test. kludge :-) */
2081 vc->vc_video_erase_char =
2082 (vc->vc_video_erase_char & 0xff00) | 'E';
2083 csi_J(vc, 2);
2084 vc->vc_video_erase_char =
2085 (vc->vc_video_erase_char & 0xff00) | ' ';
2086 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2087 }
2088 return;
2089 case ESsetG0:
2090 if (c == '0')
2091 vc->vc_G0_charset = GRAF_MAP;
2092 else if (c == 'B')
2093 vc->vc_G0_charset = LAT1_MAP;
2094 else if (c == 'U')
2095 vc->vc_G0_charset = IBMPC_MAP;
2096 else if (c == 'K')
2097 vc->vc_G0_charset = USER_MAP;
2098 if (vc->vc_charset == 0)
2099 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2100 vc->vc_state = ESnormal;
2101 return;
2102 case ESsetG1:
2103 if (c == '0')
2104 vc->vc_G1_charset = GRAF_MAP;
2105 else if (c == 'B')
2106 vc->vc_G1_charset = LAT1_MAP;
2107 else if (c == 'U')
2108 vc->vc_G1_charset = IBMPC_MAP;
2109 else if (c == 'K')
2110 vc->vc_G1_charset = USER_MAP;
2111 if (vc->vc_charset == 1)
2112 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2113 vc->vc_state = ESnormal;
2114 return;
63f3a16d
AB		 2115 case ESosc:
2116 return;
1da177e4
LT		 2117 default:
2118 vc->vc_state = ESnormal;
2119 }
2120}
2121
2f1a2ccb 2122/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2123 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2124 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2125 */
2126struct interval {
2127 uint32_t first;
2128 uint32_t last;
2129};
2130
2131static int bisearch(uint32_t ucs, const struct interval *table, int max)
2132{
2133 int min = 0;
2134 int mid;
2135
2136 if (ucs < table[0].first || ucs > table[max].last)
2137 return 0;
2138 while (max >= min) {
2139 mid = (min + max) / 2;
2140 if (ucs > table[mid].last)
2141 min = mid + 1;
2142 else if (ucs < table[mid].first)
2143 max = mid - 1;
2144 else
2145 return 1;
2146 }
2147 return 0;
2148}
2149
2150static int is_double_width(uint32_t ucs)
2151{
2152 static const struct interval double_width[] = {
2153 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2154 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2155 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2156 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2157 };
0f11541b 2158 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2159}
2160
d711ea8f
JS		 2161static void con_flush(struct vc_data *vc, unsigned long draw_from,
2162 unsigned long draw_to, int *draw_x)
2163{
2164 if (*draw_x < 0)
2165 return;
2166
2167 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2168 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2169 *draw_x = -1;
2170}
2171
ac751efa 2172/* acquires console_lock */
1da177e4
LT		 2173static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2174{
1da177e4
LT		 2175 int c, tc, ok, n = 0, draw_x = -1;
2176 unsigned int currcons;
2177 unsigned long draw_from = 0, draw_to = 0;
2178 struct vc_data *vc;
2f1a2ccb 2179 unsigned char vc_attr;
0341a4d0 2180 struct vt_notifier_param param;
2f1a2ccb
EK		 2181 uint8_t rescan;
2182 uint8_t inverse;
2183 uint8_t width;
1da177e4 2184 u16 himask, charmask;
1da177e4
LT		 2185
2186 if (in_interrupt())
2187 return count;
2188
2189 might_sleep();
2190
ac751efa 2191 console_lock();
1da177e4
LT		 2192 vc = tty->driver_data;
2193 if (vc == NULL) {
2194 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2195 console_unlock();
1da177e4
LT		 2196 return 0;
2197 }
2198
2199 currcons = vc->vc_num;
2200 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2201 /* could this happen? */
2202 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2203 console_unlock();
2204 return 0;
1da177e4 2205 }
1da177e4 2206
1da177e4
LT		 2207 himask = vc->vc_hi_font_mask;
2208 charmask = himask ? 0x1ff : 0xff;
2209
2210 /* undraw cursor first */
6ca8dfd7 2211 if (con_is_fg(vc))
1da177e4
LT		 2212 hide_cursor(vc);
2213
0341a4d0
KD		 2214 param.vc = vc;
2215
1da177e4
LT		 2216 while (!tty->stopped && count) {
2217 int orig = *buf;
2218 c = orig;
2219 buf++;
2220 n++;
2221 count--;
2f1a2ccb
EK		 2222 rescan = 0;
2223 inverse = 0;
2224 width = 1;
1da177e4
LT		 2225
2226 /* Do no translation at all in control states */
2227 if (vc->vc_state != ESnormal) {
2228 tc = c;
d4328b40 2229 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2230 /* Combine UTF-8 into Unicode in vc_utf_char.
2231 * vc_utf_count is the number of continuation bytes still
2232 * expected to arrive.
2233 * vc_npar is the number of continuation bytes arrived so
2234 * far
2235 */
d4328b40 2236rescan_last_byte:
2f1a2ccb
EK		 2237 if ((c & 0xc0) == 0x80) {
2238 /* Continuation byte received */
2239 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2240 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2241 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2242 vc->vc_npar++;
2243 if (--vc->vc_utf_count) {
2244 /* Still need some bytes */
1da177e4 2245 continue;
2f1a2ccb
EK		 2246 }
2247 /* Got a whole character */
2248 c = vc->vc_utf_char;
2249 /* Reject overlong sequences */
2250 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2251 c > utf8_length_changes[vc->vc_npar])
2252 c = 0xfffd;
2253 } else {
2254 /* Unexpected continuation byte */
2255 vc->vc_utf_count = 0;
2256 c = 0xfffd;
2257 }
1da177e4 2258 } else {
2f1a2ccb
EK		 2259 /* Single ASCII byte or first byte of a sequence received */
2260 if (vc->vc_utf_count) {
2261 /* Continuation byte expected */
2262 rescan = 1;
2263 vc->vc_utf_count = 0;
2264 c = 0xfffd;
2265 } else if (c > 0x7f) {
2266 /* First byte of a multibyte sequence received */
2267 vc->vc_npar = 0;
2268 if ((c & 0xe0) == 0xc0) {
2269 vc->vc_utf_count = 1;
2270 vc->vc_utf_char = (c & 0x1f);
2271 } else if ((c & 0xf0) == 0xe0) {
2272 vc->vc_utf_count = 2;
2273 vc->vc_utf_char = (c & 0x0f);
2274 } else if ((c & 0xf8) == 0xf0) {
2275 vc->vc_utf_count = 3;
2276 vc->vc_utf_char = (c & 0x07);
2277 } else if ((c & 0xfc) == 0xf8) {
2278 vc->vc_utf_count = 4;
2279 vc->vc_utf_char = (c & 0x03);
2280 } else if ((c & 0xfe) == 0xfc) {
2281 vc->vc_utf_count = 5;
2282 vc->vc_utf_char = (c & 0x01);
2283 } else {
2284 /* 254 and 255 are invalid */
2285 c = 0xfffd;
2286 }
2287 if (vc->vc_utf_count) {
2288 /* Still need some bytes */
2289 continue;
2290 }
2291 }
2292 /* Nothing to do if an ASCII byte was received */
1da177e4 2293 }
2f1a2ccb
EK		 2294 /* End of UTF-8 decoding. */
2295 /* c is the received character, or U+FFFD for invalid sequences. */
2296 /* Replace invalid Unicode code points with U+FFFD too */
2297 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2298 c = 0xfffd;
2299 tc = c;
d4328b40 2300 } else { /* no utf or alternate charset mode */
a29ccf6f 2301 tc = vc_translate(vc, c);
1da177e4
LT		 2302 }
2303
0341a4d0
KD		 2304 param.c = tc;
2305 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2306 &param) == NOTIFY_STOP)
2307 continue;
2308
1da177e4
LT		 2309 /* If the original code was a control character we
2310 * only allow a glyph to be displayed if the code is
2311 * not normally used (such as for cursor movement) or
2312 * if the disp_ctrl mode has been explicitly enabled.
2313 * Certain characters (as given by the CTRL_ALWAYS
2314 * bitmap) are always displayed as control characters,
2315 * as the console would be pretty useless without
2316 * them; to display an arbitrary font position use the
2317 * direct-to-font zone in UTF-8 mode.
2318 */
2319 ok = tc && (c >= 32 ||
d4328b40
AT		 2320 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2321 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2322 && (c != 127 || vc->vc_disp_ctrl)
2323 && (c != 128+27);
2324
2325 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2326 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2327 if (is_double_width(c))
2328 width = 2;
2329 }
1da177e4
LT		 2330 /* Now try to find out how to display it */
2331 tc = conv_uni_to_pc(vc, tc);
d4328b40 2332 if (tc & ~charmask) {
2f1a2ccb
EK		 2333 if (tc == -1 || tc == -2) {
2334 continue; /* nothing to display */
2335 }
2336 /* Glyph not found */
c0b79882 2337 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2338 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2339 This would make absolutely no sense with Unicode in mind,
2340 but do this for ASCII characters since a font may lack
2341 Unicode mapping info and we don't want to end up with
2342 having question marks only. */
2f1a2ccb
EK		 2343 tc = c;
2344 } else {
2345 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2346 tc = conv_uni_to_pc(vc, 0xfffd);
2347 if (tc < 0) {
2348 inverse = 1;
2349 tc = conv_uni_to_pc(vc, '?');
2350 if (tc < 0) tc = '?';
2351 }
2352 }
d4328b40 2353 }
1da177e4 2354
2f1a2ccb
EK		 2355 if (!inverse) {
2356 vc_attr = vc->vc_attr;
1da177e4 2357 } else {
2f1a2ccb
EK		 2358 /* invert vc_attr */
2359 if (!vc->vc_can_do_color) {
2360 vc_attr = (vc->vc_attr) ^ 0x08;
2361 } else if (vc->vc_hi_font_mask == 0x100) {
2362 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2363 } else {
2364 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2365 }
d711ea8f 2366 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4 2367 }
2f1a2ccb
EK		 2368
2369 while (1) {
2370 if (vc->vc_need_wrap || vc->vc_decim)
d711ea8f
JS		 2371 con_flush(vc, draw_from, draw_to,
2372 &draw_x);
2f1a2ccb
EK		 2373 if (vc->vc_need_wrap) {
2374 cr(vc);
2375 lf(vc);
2376 }
2377 if (vc->vc_decim)
2378 insert_char(vc, 1);
2379 scr_writew(himask ?
2380 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2381 (vc_attr << 8) + tc,
2382 (u16 *) vc->vc_pos);
6ca8dfd7 2383 if (con_should_update(vc) && draw_x < 0) {
2f1a2ccb
EK		 2384 draw_x = vc->vc_x;
2385 draw_from = vc->vc_pos;
2386 }
2387 if (vc->vc_x == vc->vc_cols - 1) {
2388 vc->vc_need_wrap = vc->vc_decawm;
2389 draw_to = vc->vc_pos + 2;
2390 } else {
2391 vc->vc_x++;
2392 draw_to = (vc->vc_pos += 2);
d4328b40 2393 }
2f1a2ccb
EK		 2394
2395 if (!--width) break;
2396
2397 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2398 if (tc < 0) tc = ' ';
2399 }
b293d758 2400 notify_write(vc, c);
2f1a2ccb 2401
d711ea8f
JS		 2402 if (inverse)
2403 con_flush(vc, draw_from, draw_to, &draw_x);
1ed8a2b3 2404
2f1a2ccb
EK		 2405 if (rescan) {
2406 rescan = 0;
2407 inverse = 0;
2408 width = 1;
d4328b40
AT		 2409 c = orig;
2410 goto rescan_last_byte;
2411 }
1da177e4
LT		 2412 continue;
2413 }
d711ea8f 2414 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4
LT		 2415 do_con_trol(tty, vc, orig);
2416 }
d711ea8f 2417 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4 2418 console_conditional_schedule();
ac751efa 2419 console_unlock();
b293d758 2420 notify_update(vc);
1da177e4 2421 return n;
1da177e4
LT		 2422}
2423
2424/*
2425 * This is the console switching callback.
2426 *
2427 * Doing console switching in a process context allows
2428 * us to do the switches asynchronously (needed when we want
2429 * to switch due to a keyboard interrupt). Synchronization
2430 * with other console code and prevention of re-entrancy is
ac751efa 2431 * ensured with console_lock.
1da177e4 2432 */
65f27f38 2433static void console_callback(struct work_struct *ignored)
1da177e4 2434{
ac751efa 2435 console_lock();
1da177e4
LT		 2436
2437 if (want_console >= 0) {
2438 if (want_console != fg_console &&
2439 vc_cons_allocated(want_console)) {
2440 hide_cursor(vc_cons[fg_console].d);
2441 change_console(vc_cons[want_console].d);
2442 /* we only changed when the console had already
2443 been allocated - a new console is not created
2444 in an interrupt routine */
2445 }
2446 want_console = -1;
2447 }
2448 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2449 do_poke_blanked_console = 0;
2450 poke_blanked_console();
2451 }
2452 if (scrollback_delta) {
2453 struct vc_data *vc = vc_cons[fg_console].d;
2454 clear_selection();
97293de9 2455 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
1da177e4
LT		 2456 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2457 scrollback_delta = 0;
2458 }
2459 if (blank_timer_expired) {
2460 do_blank_screen(0);
2461 blank_timer_expired = 0;
2462 }
b293d758 2463 notify_update(vc_cons[fg_console].d);
1da177e4 2464
ac751efa 2465 console_unlock();
1da177e4
LT		 2466}
2467
b257bc05 2468int set_console(int nr)
1da177e4 2469{
b257bc05
AJ		 2470 struct vc_data *vc = vc_cons[fg_console].d;
2471
2472 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2473 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2474
2475 /*
2476 * Console switch will fail in console_callback() or
2477 * change_console() so there is no point scheduling
2478 * the callback
2479 *
2480 * Existing set_console() users don't check the return
2481 * value so this shouldn't break anything
2482 */
2483 return -EINVAL;
2484 }
2485
1da177e4
LT		 2486 want_console = nr;
2487 schedule_console_callback();
b257bc05
AJ		 2488
2489 return 0;
1da177e4
LT		 2490}
2491
2492struct tty_driver *console_driver;
2493
2494#ifdef CONFIG_VT_CONSOLE
2495
5ada918b
BW		 2496/**
2497 * vt_kmsg_redirect() - Sets/gets the kernel message console
2498 * @new: The new virtual terminal number or -1 if the console should stay
2499 * unchanged
2500 *
2501 * By default, the kernel messages are always printed on the current virtual
2502 * console. However, the user may modify that default with the
2503 * TIOCL_SETKMSGREDIRECT ioctl call.
2504 *
2505 * This function sets the kernel message console to be @new. It returns the old
2506 * virtual console number. The virtual terminal number 0 (both as parameter and
2507 * return value) means no redirection (i.e. always printed on the currently
2508 * active console).
2509 *
2510 * The parameter -1 means that only the current console is returned, but the
2511 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2512 * case to make the code more understandable.
2513 *
2514 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2515 * the parameter and always returns 0.
2516 */
2517int vt_kmsg_redirect(int new)
2518{
2519 static int kmsg_con;
2520
2521 if (new != -1)
2522 return xchg(&kmsg_con, new);
2523 else
2524 return kmsg_con;
2525}
2526
1da177e4
LT		 2527/*
2528 * Console on virtual terminal
2529 *
2530 * The console must be locked when we get here.
2531 */
2532
2533static void vt_console_print(struct console *co, const char *b, unsigned count)
2534{
2535 struct vc_data *vc = vc_cons[fg_console].d;
2536 unsigned char c;
b0940003 2537 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2538 const ushort *start;
2539 ushort cnt = 0;
2540 ushort myx;
5ada918b 2541 int kmsg_console;
1da177e4
LT		 2542
2543 /* console busy or not yet initialized */
b0940003
NP		 2544 if (!printable)
2545 return;
2546 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2547 return;
2548
5ada918b
BW		 2549 kmsg_console = vt_get_kmsg_redirect();
2550 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2551 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2552
2553 /* read `x' only after setting currcons properly (otherwise
2554 the `x' macro will read the x of the foreground console). */
2555 myx = vc->vc_x;
2556
2557 if (!vc_cons_allocated(fg_console)) {
2558 /* impossible */
2559 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2560 goto quit;
2561 }
2562
8fd4bd22 2563 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2564 goto quit;
2565
2566 /* undraw cursor first */
6ca8dfd7 2567 if (con_is_fg(vc))
1da177e4
LT		 2568 hide_cursor(vc);
2569
2570 start = (ushort *)vc->vc_pos;
2571
2572 /* Contrived structure to try to emulate original need_wrap behaviour
2573 * Problems caused when we have need_wrap set on '\n' character */
2574 while (count--) {
2575 c = *b++;
2576 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2577 if (cnt > 0) {
6ca8dfd7 2578 if (con_is_visible(vc))
1da177e4
LT		 2579 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2580 vc->vc_x += cnt;
2581 if (vc->vc_need_wrap)
2582 vc->vc_x--;
2583 cnt = 0;
2584 }
2585 if (c == 8) { /* backspace */
2586 bs(vc);
2587 start = (ushort *)vc->vc_pos;
2588 myx = vc->vc_x;
2589 continue;
2590 }
2591 if (c != 13)
2592 lf(vc);
2593 cr(vc);
2594 start = (ushort *)vc->vc_pos;
2595 myx = vc->vc_x;
2596 if (c == 10 || c == 13)
2597 continue;
2598 }
2599 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2600 notify_write(vc, c);
1da177e4
LT		 2601 cnt++;
2602 if (myx == vc->vc_cols - 1) {
2603 vc->vc_need_wrap = 1;
2604 continue;
2605 }
2606 vc->vc_pos += 2;
2607 myx++;
2608 }
2609 if (cnt > 0) {
6ca8dfd7 2610 if (con_is_visible(vc))
1da177e4
LT		 2611 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2612 vc->vc_x += cnt;
2613 if (vc->vc_x == vc->vc_cols) {
2614 vc->vc_x--;
2615 vc->vc_need_wrap = 1;
2616 }
2617 }
2618 set_cursor(vc);
b293d758 2619 notify_update(vc);
1da177e4
LT		 2620
2621quit:
b0940003 2622 spin_unlock(&printing_lock);
1da177e4
LT		 2623}
2624
2625static struct tty_driver *vt_console_device(struct console *c, int *index)
2626{
2627 *index = c->index ? c->index-1 : fg_console;
2628 return console_driver;
2629}
2630
2631static struct console vt_console_driver = {
2632 .name = "tty",
2633 .write = vt_console_print,
2634 .device = vt_console_device,
2635 .unblank = unblank_screen,
2636 .flags = CON_PRINTBUFFER,
2637 .index = -1,
2638};
2639#endif
2640
2641/*
2642 * Handling of Linux-specific VC ioctls
2643 */
2644
2645/*
ac751efa 2646 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2647 *
2648 * There are some functions which don't need it.
2649 *
2650 * There are some functions which can sleep for arbitrary periods
2651 * (paste_selection) but we don't need the lock there anyway.
2652 *
2653 * set_selection has locking, and definitely needs it
2654 */
2655
2656int tioclinux(struct tty_struct *tty, unsigned long arg)
2657{
2658 char type, data;
2659 char __user *p = (char __user *)arg;
2660 int lines;
2661 int ret;
2662
1da177e4
LT		 2663 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2664 return -EPERM;
2665 if (get_user(type, p))
2666 return -EFAULT;
2667 ret = 0;
04f378b1 2668
1da177e4
LT		 2669 switch (type)
2670 {
2671 case TIOCL_SETSEL:
ac751efa 2672 console_lock();
1da177e4 2673 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2674 console_unlock();
1da177e4
LT		 2675 break;
2676 case TIOCL_PASTESEL:
2677 ret = paste_selection(tty);
2678 break;
2679 case TIOCL_UNBLANKSCREEN:
ac751efa 2680 console_lock();
1da177e4 2681 unblank_screen();
ac751efa 2682 console_unlock();
1da177e4
LT		 2683 break;
2684 case TIOCL_SELLOADLUT:
5289475d 2685 console_lock();
1da177e4 2686 ret = sel_loadlut(p);
5289475d 2687 console_unlock();
1da177e4
LT		 2688 break;
2689 case TIOCL_GETSHIFTSTATE:
04f378b1 2690
1da177e4
LT		 2691 /*
2692 * Make it possible to react to Shift+Mousebutton.
2693 * Note that 'shift_state' is an undocumented
2694 * kernel-internal variable; programs not closely
2695 * related to the kernel should not use this.
2696 */
079c9534 2697 data = vt_get_shift_state();
1da177e4
LT		 2698 ret = __put_user(data, p);
2699 break;
2700 case TIOCL_GETMOUSEREPORTING:
20f62579 2701 console_lock(); /* May be overkill */
1da177e4 2702 data = mouse_reporting();
20f62579 2703 console_unlock();
1da177e4
LT		 2704 ret = __put_user(data, p);
2705 break;
2706 case TIOCL_SETVESABLANK:
20f62579 2707 console_lock();
403aac96 2708 ret = set_vesa_blanking(p);
20f62579 2709 console_unlock();
1da177e4 2710 break;
0ca07731 2711 case TIOCL_GETKMSGREDIRECT:
5ada918b 2712 data = vt_get_kmsg_redirect();
0ca07731
RW		 2713 ret = __put_user(data, p);
2714 break;
1da177e4
LT		 2715 case TIOCL_SETKMSGREDIRECT:
2716 if (!capable(CAP_SYS_ADMIN)) {
2717 ret = -EPERM;
2718 } else {
2719 if (get_user(data, p+1))
2720 ret = -EFAULT;
2721 else
5ada918b 2722 vt_kmsg_redirect(data);
1da177e4
LT		 2723 }
2724 break;
2725 case TIOCL_GETFGCONSOLE:
20f62579
AC		 2726 /* No locking needed as this is a transiently
2727 correct return anyway if the caller hasn't
2728 disabled switching */
1da177e4
LT		 2729 ret = fg_console;
2730 break;
2731 case TIOCL_SCROLLCONSOLE:
2732 if (get_user(lines, (s32 __user *)(p+4))) {
2733 ret = -EFAULT;
2734 } else {
20f62579
AC		 2735 /* Need the console lock here. Note that lots
2736 of other calls need fixing before the lock
2737 is actually useful ! */
2738 console_lock();
1da177e4 2739 scrollfront(vc_cons[fg_console].d, lines);
20f62579 2740 console_unlock();
1da177e4
LT		 2741 ret = 0;
2742 }
2743 break;
2744 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2745 console_lock();
1da177e4
LT		 2746 ignore_poke = 1;
2747 do_blank_screen(0);
ac751efa 2748 console_unlock();
1da177e4
LT		 2749 break;
2750 case TIOCL_BLANKEDSCREEN:
2751 ret = console_blanked;
2752 break;
2753 default:
2754 ret = -EINVAL;
2755 break;
2756 }
2757 return ret;
2758}
2759
2760/*
2761 * /dev/ttyN handling
2762 */
2763
2764static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2765{
2766 int retval;
2767
2768 retval = do_con_write(tty, buf, count);
2769 con_flush_chars(tty);
2770
2771 return retval;
2772}
2773
5d19f546 2774static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2775{
2776 if (in_interrupt())
5d19f546
AC		 2777 return 0; /* n_r3964 calls put_char() from interrupt context */
2778 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2779}
2780
2781static int con_write_room(struct tty_struct *tty)
2782{
2783 if (tty->stopped)
2784 return 0;
a88a69c9 2785 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2786}
2787
2788static int con_chars_in_buffer(struct tty_struct *tty)
2789{
2790 return 0; /* we're not buffering */
2791}
2792
2793/*
2794 * con_throttle and con_unthrottle are only used for
2795 * paste_selection(), which has to stuff in a large number of
2796 * characters...
2797 */
2798static void con_throttle(struct tty_struct *tty)
2799{
2800}
2801
2802static void con_unthrottle(struct tty_struct *tty)
2803{
2804 struct vc_data *vc = tty->driver_data;
2805
2806 wake_up_interruptible(&vc->paste_wait);
2807}
2808
2809/*
2810 * Turn the Scroll-Lock LED on when the tty is stopped
2811 */
2812static void con_stop(struct tty_struct *tty)
2813{
2814 int console_num;
2815 if (!tty)
2816 return;
2817 console_num = tty->index;
2818 if (!vc_cons_allocated(console_num))
2819 return;
079c9534 2820 vt_kbd_con_stop(console_num);
1da177e4
LT		 2821}
2822
2823/*
2824 * Turn the Scroll-Lock LED off when the console is started
2825 */
2826static void con_start(struct tty_struct *tty)
2827{
2828 int console_num;
2829 if (!tty)
2830 return;
2831 console_num = tty->index;
2832 if (!vc_cons_allocated(console_num))
2833 return;
079c9534 2834 vt_kbd_con_start(console_num);
1da177e4
LT		 2835}
2836
2837static void con_flush_chars(struct tty_struct *tty)
2838{
2839 struct vc_data *vc;
2840
2841 if (in_interrupt()) /* from flush_to_ldisc */
2842 return;
2843
2844 /* if we race with con_close(), vt may be null */
ac751efa 2845 console_lock();
1da177e4
LT		 2846 vc = tty->driver_data;
2847 if (vc)
2848 set_cursor(vc);
ac751efa 2849 console_unlock();
1da177e4
LT		 2850}
2851
2852/*
2853 * Allocate the console screen memory.
2854 */
bc1e99d9 2855static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 2856{
2857 unsigned int currcons = tty->index;
bc1e99d9
JS		 2858 struct vc_data *vc;
2859 int ret;
1da177e4 2860
ac751efa 2861 console_lock();
bc1e99d9
JS		 2862 ret = vc_allocate(currcons);
2863 if (ret)
2864 goto unlock;
feebed65 2865
bc1e99d9 2866 vc = vc_cons[currcons].d;
1da177e4 2867
bc1e99d9
JS		 2868 /* Still being freed */
2869 if (vc->port.tty) {
2870 ret = -ERESTARTSYS;
2871 goto unlock;
2872 }
2873
2874 ret = tty_port_install(&vc->port, driver, tty);
2875 if (ret)
2876 goto unlock;
2877
2878 tty->driver_data = vc;
2879 vc->port.tty = tty;
2880
2881 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2882 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2883 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 2884 }
bc1e99d9 2885 if (vc->vc_utf)
adc8d746 2886 tty->termios.c_iflag |= IUTF8;
bc1e99d9 2887 else
adc8d746 2888 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 2889unlock:
ac751efa 2890 console_unlock();
1da177e4
LT		 2891 return ret;
2892}
2893
bc1e99d9
JS		 2894static int con_open(struct tty_struct *tty, struct file *filp)
2895{
2896 /* everything done in install */
2897 return 0;
2898}
2899
2900
1da177e4
LT		 2901static void con_close(struct tty_struct *tty, struct file *filp)
2902{
feebed65
AC		 2903 /* Nothing to do - we defer to shutdown */
2904}
1da177e4 2905
feebed65
AC		 2906static void con_shutdown(struct tty_struct *tty)
2907{
2908 struct vc_data *vc = tty->driver_data;
2909 BUG_ON(vc == NULL);
ac751efa 2910 console_lock();
8ce73264 2911 vc->port.tty = NULL;
ac751efa 2912 console_unlock();
1da177e4
LT		 2913}
2914
3855ae1c 2915static int default_color = 7; /* white */
fa6ce9ab
JE		 2916static int default_italic_color = 2; // green (ASCII)
2917static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 2918module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 2919module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2920module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2921
1da177e4
LT		 2922static void vc_init(struct vc_data *vc, unsigned int rows,
2923 unsigned int cols, int do_clear)
2924{
2925 int j, k ;
2926
2927 vc->vc_cols = cols;
2928 vc->vc_rows = rows;
2929 vc->vc_size_row = cols << 1;
2930 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2931
2932 set_origin(vc);
2933 vc->vc_pos = vc->vc_origin;
2934 reset_vc(vc);
2935 for (j=k=0; j<16; j++) {
2936 vc->vc_palette[k++] = default_red[j] ;
2937 vc->vc_palette[k++] = default_grn[j] ;
2938 vc->vc_palette[k++] = default_blu[j] ;
2939 }
3855ae1c 2940 vc->vc_def_color = default_color;
fa6ce9ab
JE		 2941 vc->vc_ulcolor = default_underline_color;
2942 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2943 vc->vc_halfcolor = 0x08; /* grey */
2944 init_waitqueue_head(&vc->paste_wait);
2945 reset_terminal(vc, do_clear);
2946}
2947
2948/*
2949 * This routine initializes console interrupts, and does nothing
2950 * else. If you want the screen to clear, call tty_write with
2951 * the appropriate escape-sequence.
2952 */
2953
2954static int __init con_init(void)
2955{
2956 const char *display_desc = NULL;
2957 struct vc_data *vc;
3e795de7 2958 unsigned int currcons = 0, i;
1da177e4 2959
ac751efa 2960 console_lock();
1da177e4
LT		 2961
2962 if (conswitchp)
2963 display_desc = conswitchp->con_startup();
2964 if (!display_desc) {
2965 fg_console = 0;
ac751efa 2966 console_unlock();
1da177e4
LT		 2967 return 0;
2968 }
2969
3e795de7
AD		 2970 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2971 struct con_driver *con_driver = &registered_con_driver[i];
2972
2973 if (con_driver->con == NULL) {
2974 con_driver->con = conswitchp;
2975 con_driver->desc = display_desc;
2976 con_driver->flag = CON_DRIVER_FLAG_INIT;
2977 con_driver->first = 0;
2978 con_driver->last = MAX_NR_CONSOLES - 1;
2979 break;
2980 }
2981 }
2982
2983 for (i = 0; i < MAX_NR_CONSOLES; i++)
2984 con_driver_map[i] = conswitchp;
2985
1da177e4
LT		 2986 if (blankinterval) {
2987 blank_state = blank_normal_wait;
f324edc8 2988 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2989 }
2990
1da177e4 2991 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2992 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2993 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 2994 tty_port_init(&vc->port);
1da177e4 2995 visual_init(vc, currcons, 1);
a5f4f52e 2996 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 2997 vc_init(vc, vc->vc_rows, vc->vc_cols,
2998 currcons || !vc->vc_sw->con_save_screen);
2999 }
3000 currcons = fg_console = 0;
3001 master_display_fg = vc = vc_cons[currcons].d;
3002 set_origin(vc);
3003 save_screen(vc);
3004 gotoxy(vc, vc->vc_x, vc->vc_y);
3005 csi_J(vc, 0);
3006 update_screen(vc);
5da527aa 3007 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3008 vc->vc_can_do_color ? "colour" : "mono",
3009 display_desc, vc->vc_cols, vc->vc_rows);
3010 printable = 1;
1da177e4 3011
ac751efa 3012 console_unlock();
1da177e4
LT		 3013
3014#ifdef CONFIG_VT_CONSOLE
3015 register_console(&vt_console_driver);
3016#endif
3017 return 0;
3018}
3019console_initcall(con_init);
3020
b68e31d0 3021static const struct tty_operations con_ops = {
bc1e99d9 3022 .install = con_install,
1da177e4
LT		 3023 .open = con_open,
3024 .close = con_close,
3025 .write = con_write,
3026 .write_room = con_write_room,
3027 .put_char = con_put_char,
3028 .flush_chars = con_flush_chars,
3029 .chars_in_buffer = con_chars_in_buffer,
3030 .ioctl = vt_ioctl,
e9216651
AB		 3031#ifdef CONFIG_COMPAT
3032 .compat_ioctl = vt_compat_ioctl,
3033#endif
1da177e4
LT		 3034 .stop = con_stop,
3035 .start = con_start,
3036 .throttle = con_throttle,
3037 .unthrottle = con_unthrottle,
8c9a9dd0 3038 .resize = vt_resize,
feebed65 3039 .shutdown = con_shutdown
1da177e4
LT		 3040};
3041
d81ed103
AC		 3042static struct cdev vc0_cdev;
3043
fbc92a34
KS		 3044static ssize_t show_tty_active(struct device *dev,
3045 struct device_attribute *attr, char *buf)
3046{
3047 return sprintf(buf, "tty%d\n", fg_console + 1);
3048}
3049static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3050
1083a7be
TI		 3051static struct attribute *vt_dev_attrs[] = {
3052 &dev_attr_active.attr,
3053 NULL
3054};
3055
3056ATTRIBUTE_GROUPS(vt_dev);
3057
d81ed103 3058int __init vty_init(const struct file_operations *console_fops)
1da177e4 3059{
d81ed103
AC		 3060 cdev_init(&vc0_cdev, console_fops);
3061 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3062 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3063 panic("Couldn't register /dev/tty0 driver\n");
1083a7be
TI		 3064 tty0dev = device_create_with_groups(tty_class, NULL,
3065 MKDEV(TTY_MAJOR, 0), NULL,
3066 vt_dev_groups, "tty0");
fbc92a34
KS		 3067 if (IS_ERR(tty0dev))
3068 tty0dev = NULL;
d81ed103 3069
1da177e4
LT		 3070 vcs_init();
3071
3072 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3073 if (!console_driver)
3074 panic("Couldn't allocate console driver\n");
2f16669d 3075
1da177e4
LT		 3076 console_driver->name = "tty";
3077 console_driver->name_base = 1;
3078 console_driver->major = TTY_MAJOR;
3079 console_driver->minor_start = 1;
3080 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3081 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3082 if (default_utf8)
3083 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3084 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3085 tty_set_operations(console_driver, &con_ops);
3086 if (tty_register_driver(console_driver))
3087 panic("Couldn't register console driver\n");
1da177e4
LT		 3088 kbd_init();
3089 console_map_init();
1da177e4
LT		 3090#ifdef CONFIG_MDA_CONSOLE
3091 mda_console_init();
3092#endif
3093 return 0;
3094}
3095
3096#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3097
3098static struct class *vtconsole_class;
3099
50e244cc 3100static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3101 int deflt)
1da177e4 3102{
3e795de7
AD		 3103 struct module *owner = csw->owner;
3104 const char *desc = NULL;
3105 struct con_driver *con_driver;
3106 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3107
1da177e4
LT		 3108 if (!try_module_get(owner))
3109 return -ENODEV;
3110
50e244cc 3111 WARN_CONSOLE_UNLOCKED();
1c8ce271 3112
3e795de7
AD		 3113 /* check if driver is registered */
3114 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3115 con_driver = &registered_con_driver[i];
3116
3117 if (con_driver->con == csw) {
3118 desc = con_driver->desc;
3119 retval = 0;
3120 break;
3121 }
3122 }
3123
3124 if (retval)
3125 goto err;
3126
3127 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3128 csw->con_startup();
3129 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3130 }
1c8ce271 3131
1da177e4
LT		 3132 if (deflt) {
3133 if (conswitchp)
3134 module_put(conswitchp->owner);
1c8ce271 3135
1da177e4
LT		 3136 __module_get(owner);
3137 conswitchp = csw;
3138 }
3139
3e795de7
AD		 3140 first = max(first, con_driver->first);
3141 last = min(last, con_driver->last);
3142
1da177e4
LT		 3143 for (i = first; i <= last; i++) {
3144 int old_was_color;
3145 struct vc_data *vc = vc_cons[i].d;
3146
3147 if (con_driver_map[i])
3148 module_put(con_driver_map[i]->owner);
3149 __module_get(owner);
3150 con_driver_map[i] = csw;
3151
3152 if (!vc || !vc->vc_sw)
3153 continue;
3154
3155 j = i;
1c8ce271 3156
6ca8dfd7 3157 if (con_is_visible(vc)) {
4ee1acce 3158 k = i;
1da177e4 3159 save_screen(vc);
4ee1acce
DH		 3160 }
3161
1da177e4
LT		 3162 old_was_color = vc->vc_can_do_color;
3163 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3164 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3165 visual_init(vc, i, 0);
1c8ce271 3166 set_origin(vc);
1da177e4
LT		 3167 update_attr(vc);
3168
3169 /* If the console changed between mono <-> color, then
3170 * the attributes in the screenbuf will be wrong. The
3171 * following resets all attributes to something sane.
3172 */
3173 if (old_was_color != vc->vc_can_do_color)
3174 clear_buffer_attributes(vc);
1da177e4 3175 }
4ee1acce 3176
1ffdda95 3177 pr_info("Console: switching ");
1da177e4 3178 if (!deflt)
4bcc595c 3179 printk(KERN_CONT "consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3180 if (j >= 0) {
3181 struct vc_data *vc = vc_cons[j].d;
3182
4bcc595c 3183 printk(KERN_CONT "to %s %s %dx%d\n",
4ee1acce
DH		 3184 vc->vc_can_do_color ? "colour" : "mono",
3185 desc, vc->vc_cols, vc->vc_rows);
3186
3187 if (k >= 0) {
3188 vc = vc_cons[k].d;
3189 update_screen(vc);
3190 }
3191 } else
4bcc595c 3192 printk(KERN_CONT "to %s\n", desc);
1da177e4 3193
3e795de7
AD		 3194 retval = 0;
3195err:
1da177e4 3196 module_put(owner);
3e795de7
AD		 3197 return retval;
3198};
1da177e4 3199
50e244cc 3200
13ae6645 3201#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86
TI		 3202/* unlocked version of unbind_con_driver() */
3203int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3204{
3e795de7
AD		 3205 struct module *owner = csw->owner;
3206 const struct consw *defcsw = NULL;
3207 struct con_driver *con_driver = NULL, *con_back = NULL;
3208 int i, retval = -ENODEV;
1da177e4 3209
3e795de7
AD		 3210 if (!try_module_get(owner))
3211 return -ENODEV;
3212
e93a9a86 3213 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3214
3215 /* check if driver is registered and if it is unbindable */
3216 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3217 con_driver = &registered_con_driver[i];
3218
3219 if (con_driver->con == csw &&
6db4063c 3220 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3221 retval = 0;
3222 break;
3223 }
3224 }
3225
e93a9a86 3226 if (retval)
3e795de7 3227 goto err;
3e795de7 3228
6db4063c
AD		 3229 retval = -ENODEV;
3230
3e795de7
AD		 3231 /* check if backup driver exists */
3232 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3233 con_back = &registered_con_driver[i];
3234
249f7b3e 3235 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3236 defcsw = con_back->con;
3237 retval = 0;
3238 break;
3239 }
3240 }
3241
e93a9a86 3242 if (retval)
3e795de7 3243 goto err;
3e795de7 3244
e93a9a86 3245 if (!con_is_bound(csw))
3e795de7 3246 goto err;
3e795de7
AD		 3247
3248 first = max(first, con_driver->first);
3249 last = min(last, con_driver->last);
3250
3251 for (i = first; i <= last; i++) {
1da177e4
LT		 3252 if (con_driver_map[i] == csw) {
3253 module_put(csw->owner);
3254 con_driver_map[i] = NULL;
3255 }
3e795de7
AD		 3256 }
3257
3258 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3259 const struct consw *defconsw = conswitchp;
3260
3e795de7
AD		 3261 defcsw->con_startup();
3262 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3263 /*
3264 * vgacon may change the default driver to point
3265 * to dummycon, we restore it here...
3266 */
3267 conswitchp = defconsw;
3e795de7
AD		 3268 }
3269
3270 if (!con_is_bound(csw))
3271 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3272
6db4063c 3273 /* ignore return value, binding should not fail */
50e244cc 3274 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3275err:
3276 module_put(owner);
3277 return retval;
3278
3279}
e93a9a86 3280EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3281
6db4063c
AD		 3282static int vt_bind(struct con_driver *con)
3283{
3284 const struct consw *defcsw = NULL, *csw = NULL;
3285 int i, more = 1, first = -1, last = -1, deflt = 0;
3286
77232f79 3287 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3288 goto err;
3289
3290 csw = con->con;
3291
3292 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3293 struct con_driver *con = &registered_con_driver[i];
3294
3295 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3296 defcsw = con->con;
3297 break;
3298 }
3299 }
3300
3301 if (!defcsw)
3302 goto err;
3303
3304 while (more) {
3305 more = 0;
3306
3307 for (i = con->first; i <= con->last; i++) {
3308 if (con_driver_map[i] == defcsw) {
3309 if (first == -1)
3310 first = i;
3311 last = i;
3312 more = 1;
3313 } else if (first != -1)
3314 break;
3315 }
3316
3317 if (first == 0 && last == MAX_NR_CONSOLES -1)
3318 deflt = 1;
3319
4c215fe8 3320 if (first != -1)
c62a1e57 3321 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3322
3323 first = -1;
3324 last = -1;
3325 deflt = 0;
3326 }
3327
3328err:
3329 return 0;
3330}
3331
3332static int vt_unbind(struct con_driver *con)
3333{
3334 const struct consw *csw = NULL;
3335 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3336 int ret;
6db4063c 3337
77232f79 3338 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3339 goto err;
3340
3341 csw = con->con;
3342
3343 while (more) {
3344 more = 0;
3345
3346 for (i = con->first; i <= con->last; i++) {
3347 if (con_driver_map[i] == csw) {
3348 if (first == -1)
3349 first = i;
3350 last = i;
3351 more = 1;
3352 } else if (first != -1)
3353 break;
3354 }
3355
3356 if (first == 0 && last == MAX_NR_CONSOLES -1)
3357 deflt = 1;
3358
618f2b90 3359 if (first != -1) {
f418f2ec 3360 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3361 if (ret != 0)
3362 return ret;
618f2b90 3363 }
6db4063c
AD		 3364
3365 first = -1;
3366 last = -1;
3367 deflt = 0;
3368 }
3369
3370err:
3371 return 0;
3372}
13ae6645
AD		 3373#else
3374static inline int vt_bind(struct con_driver *con)
3375{
3376 return 0;
3377}
3378static inline int vt_unbind(struct con_driver *con)
3379{
3380 return 0;
3381}
3382#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3383
805952a8 3384static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3385 const char *buf, size_t count)
3386{
805952a8 3387 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3388 int bind = simple_strtoul(buf, NULL, 0);
3389
4c215fe8
ID		 3390 console_lock();
3391
6db4063c
AD		 3392 if (bind)
3393 vt_bind(con);
3394 else
3395 vt_unbind(con);
3396
4c215fe8
ID		 3397 console_unlock();
3398
6db4063c
AD		 3399 return count;
3400}
3401
805952a8
GKH		 3402static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3403 char *buf)
6db4063c 3404{
805952a8 3405 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3406 int bind = con_is_bound(con->con);
3407
3408 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3409}
3410
805952a8
GKH		 3411static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3412 char *buf)
6db4063c 3413{
805952a8 3414 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3415
3416 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3417 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3418 con->desc);
3419
3420}
3421
1083a7be
TI		 3422static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3423static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3424
3425static struct attribute *con_dev_attrs[] = {
3426 &dev_attr_bind.attr,
3427 &dev_attr_name.attr,
3428 NULL
6db4063c
AD		 3429};
3430
1083a7be
TI		 3431ATTRIBUTE_GROUPS(con_dev);
3432
805952a8 3433static int vtconsole_init_device(struct con_driver *con)
6db4063c 3434{
928e964f 3435 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3436 return 0;
6db4063c
AD		 3437}
3438
805952a8 3439static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3440{
1083a7be 3441 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3442}
3443
3e795de7
AD		 3444/**
3445 * con_is_bound - checks if driver is bound to the console
3446 * @csw: console driver
3447 *
3448 * RETURNS: zero if unbound, nonzero if bound
3449 *
3450 * Drivers can call this and if zero, they should release
3451 * all resources allocated on con_startup()
3452 */
3453int con_is_bound(const struct consw *csw)
3454{
3455 int i, bound = 0;
3456
3457 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3458 if (con_driver_map[i] == csw) {
3459 bound = 1;
3460 break;
3461 }
3462 }
3463
3464 return bound;
3465}
3466EXPORT_SYMBOL(con_is_bound);
3467
b45cfba4
JB		 3468/**
3469 * con_debug_enter - prepare the console for the kernel debugger
3470 * @sw: console driver
3471 *
3472 * Called when the console is taken over by the kernel debugger, this
3473 * function needs to save the current console state, then put the console
3474 * into a state suitable for the kernel debugger.
3475 *
3476 * RETURNS:
3477 * Zero on success, nonzero if a failure occurred when trying to prepare
3478 * the console for the debugger.
3479 */
3480int con_debug_enter(struct vc_data *vc)
3481{
3482 int ret = 0;
3483
3484 saved_fg_console = fg_console;
3485 saved_last_console = last_console;
3486 saved_want_console = want_console;
3487 saved_vc_mode = vc->vc_mode;
beed5336 3488 saved_console_blanked = console_blanked;
b45cfba4
JB		 3489 vc->vc_mode = KD_TEXT;
3490 console_blanked = 0;
3491 if (vc->vc_sw->con_debug_enter)
3492 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3493#ifdef CONFIG_KGDB_KDB
3494 /* Set the initial LINES variable if it is not already set */
3495 if (vc->vc_rows < 999) {
3496 int linecount;
3497 char lns[4];
3498 const char *setargs[3] = {
3499 "set",
3500 "LINES",
3501 lns,
3502 };
3503 if (kdbgetintenv(setargs[0], &linecount)) {
3504 snprintf(lns, 4, "%i", vc->vc_rows);
3505 kdb_set(2, setargs);
3506 }
3507 }
17b572e8
JW		 3508 if (vc->vc_cols < 999) {
3509 int colcount;
3510 char cols[4];
3511 const char *setargs[3] = {
3512 "set",
3513 "COLUMNS",
3514 cols,
3515 };
3516 if (kdbgetintenv(setargs[0], &colcount)) {
3517 snprintf(cols, 4, "%i", vc->vc_cols);
3518 kdb_set(2, setargs);
3519 }
3520 }
81d44507 3521#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3522 return ret;
3523}
3524EXPORT_SYMBOL_GPL(con_debug_enter);
3525
3526/**
3527 * con_debug_leave - restore console state
3528 * @sw: console driver
3529 *
3530 * Restore the console state to what it was before the kernel debugger
3531 * was invoked.
3532 *
3533 * RETURNS:
3534 * Zero on success, nonzero if a failure occurred when trying to restore
3535 * the console.
3536 */
3537int con_debug_leave(void)
3538{
3539 struct vc_data *vc;
3540 int ret = 0;
3541
3542 fg_console = saved_fg_console;
3543 last_console = saved_last_console;
3544 want_console = saved_want_console;
beed5336 3545 console_blanked = saved_console_blanked;
b45cfba4
JB		 3546 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3547
3548 vc = vc_cons[fg_console].d;
3549 if (vc->vc_sw->con_debug_leave)
3550 ret = vc->vc_sw->con_debug_leave(vc);
3551 return ret;
3552}
3553EXPORT_SYMBOL_GPL(con_debug_leave);
3554
50e244cc 3555static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 3556{
3557 struct module *owner = csw->owner;
3558 struct con_driver *con_driver;
3559 const char *desc;
96317e9e 3560 int i, retval;
3e795de7 3561
50e244cc
AC		 3562 WARN_CONSOLE_UNLOCKED();
3563
3e795de7
AD		 3564 if (!try_module_get(owner))
3565 return -ENODEV;
3566
3e795de7
AD		 3567 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3568 con_driver = &registered_con_driver[i];
3569
3570 /* already registered */
96317e9e 3571 if (con_driver->con == csw) {
c55c63c6 3572 retval = -EBUSY;
96317e9e
JS		 3573 goto err;
3574 }
3e795de7
AD		 3575 }
3576
3e795de7 3577 desc = csw->con_startup();
6798df4c
JS		 3578 if (!desc) {
3579 retval = -ENODEV;
3e795de7 3580 goto err;
6798df4c 3581 }
3e795de7
AD		 3582
3583 retval = -EINVAL;
3584
3585 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3586 con_driver = &registered_con_driver[i];
3587
d364b5c3
ID		 3588 if (con_driver->con == NULL &&
3589 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 3590 con_driver->con = csw;
3591 con_driver->desc = desc;
6db4063c
AD		 3592 con_driver->node = i;
3593 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3594 CON_DRIVER_FLAG_INIT;
3595 con_driver->first = first;
3596 con_driver->last = last;
3597 retval = 0;
3598 break;
3599 }
3600 }
3601
6db4063c
AD		 3602 if (retval)
3603 goto err;
3604
1083a7be
TI		 3605 con_driver->dev =
3606 device_create_with_groups(vtconsole_class, NULL,
3607 MKDEV(0, con_driver->node),
3608 con_driver, con_dev_groups,
3609 "vtcon%i", con_driver->node);
805952a8
GKH		 3610 if (IS_ERR(con_driver->dev)) {
3611 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3612 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3613 PTR_ERR(con_driver->dev));
3614 con_driver->dev = NULL;
6db4063c 3615 } else {
805952a8 3616 vtconsole_init_device(con_driver);
6db4063c 3617 }
928e964f 3618
3e795de7 3619err:
3e795de7
AD		 3620 module_put(owner);
3621 return retval;
3622}
50e244cc 3623
3e795de7
AD		 3624
3625/**
50539dd4 3626 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 3627 * @csw: console driver
3628 *
3629 * DESCRIPTION: All drivers that registers to the console layer must
3630 * call this function upon exit, or if the console driver is in a state
3631 * where it won't be able to handle console services, such as the
3632 * framebuffer console without loaded framebuffer drivers.
3633 *
3634 * The driver must unbind first prior to unregistration.
3635 */
e93a9a86
TI		 3636int do_unregister_con_driver(const struct consw *csw)
3637{
d9c660e7 3638 int i;
3e795de7
AD		 3639
3640 /* cannot unregister a bound driver */
3641 if (con_is_bound(csw))
d9c660e7
DV		 3642 return -EBUSY;
3643
3644 if (csw == conswitchp)
3645 return -EINVAL;
3e795de7
AD		 3646
3647 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3648 struct con_driver *con_driver = &registered_con_driver[i];
3649
2cf30f75 3650 if (con_driver->con == csw) {
d364b5c3
ID		 3651 /*
3652 * Defer the removal of the sysfs entries since that
3653 * will acquire the kernfs s_active lock and we can't
3654 * acquire this lock while holding the console lock:
3655 * the unbind sysfs entry imposes already the opposite
3656 * order. Reset con already here to prevent any later
3657 * lookup to succeed and mark this slot as zombie, so
3658 * it won't get reused until we complete the removal
3659 * in the deferred work.
3660 */
3e795de7 3661 con_driver->con = NULL;
d364b5c3
ID		 3662 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3663 schedule_work(&con_driver_unregister_work);
3664
d9c660e7 3665 return 0;
3e795de7
AD		 3666 }
3667 }
d9c660e7
DV		 3668
3669 return -ENODEV;
3e795de7 3670}
e93a9a86 3671EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 3672
d364b5c3
ID		 3673static void con_driver_unregister_callback(struct work_struct *ignored)
3674{
3675 int i;
3676
3677 console_lock();
3678
3679 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3680 struct con_driver *con_driver = &registered_con_driver[i];
3681
3682 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3683 continue;
3684
3685 console_unlock();
3686
3687 vtconsole_deinit_device(con_driver);
3688 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3689
3690 console_lock();
3691
3692 if (WARN_ON_ONCE(con_driver->con))
3693 con_driver->con = NULL;
3694 con_driver->desc = NULL;
3695 con_driver->dev = NULL;
3696 con_driver->node = 0;
3697 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3698 con_driver->flag = 0;
3699 con_driver->first = 0;
3700 con_driver->last = 0;
3701 }
3702
3703 console_unlock();
3704}
3705
3e795de7
AD		 3706/*
3707 * If we support more console drivers, this function is used
3708 * when a driver wants to take over some existing consoles
3709 * and become default driver for newly opened ones.
3710 *
155957f5 3711 * do_take_over_console is basically a register followed by unbind
50e244cc
AC		 3712 */
3713int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3714{
3715 int err;
3716
3717 err = do_register_con_driver(csw, first, last);
3718 /*
3719 * If we get an busy error we still want to bind the console driver
3720 * and return success, as we may have unbound the console driver
3721 * but not unregistered it.
3722 */
3723 if (err == -EBUSY)
3724 err = 0;
3725 if (!err)
3726 do_bind_con_driver(csw, first, last, deflt);
3727
3728 return err;
3729}
3730EXPORT_SYMBOL_GPL(do_take_over_console);
3731
3e795de7
AD		 3732
3733/*
3734 * give_up_console is a wrapper to unregister_con_driver. It will only
3735 * work if driver is fully unbound.
3736 */
3737void give_up_console(const struct consw *csw)
3738{
70125e76
WY		 3739 console_lock();
3740 do_unregister_con_driver(csw);
3741 console_unlock();
3e795de7
AD		 3742}
3743
6db4063c 3744static int __init vtconsole_class_init(void)
3e795de7 3745{
6db4063c 3746 int i;
3e795de7 3747
6db4063c
AD		 3748 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3749 if (IS_ERR(vtconsole_class)) {
3750 printk(KERN_WARNING "Unable to create vt console class; "
3751 "errno = %ld\n", PTR_ERR(vtconsole_class));
3752 vtconsole_class = NULL;
3753 }
3e795de7 3754
6db4063c 3755 /* Add system drivers to sysfs */
3e795de7
AD		 3756 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3757 struct con_driver *con = &registered_con_driver[i];
3758
805952a8 3759 if (con->con && !con->dev) {
1083a7be
TI		 3760 con->dev =
3761 device_create_with_groups(vtconsole_class, NULL,
3762 MKDEV(0, con->node),
3763 con, con_dev_groups,
3764 "vtcon%i", con->node);
6db4063c 3765
805952a8 3766 if (IS_ERR(con->dev)) {
6db4063c 3767 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3768 "device for %s; errno = %ld\n",
3769 con->desc, PTR_ERR(con->dev));
3770 con->dev = NULL;
6db4063c 3771 } else {
805952a8 3772 vtconsole_init_device(con);
6db4063c 3773 }
3e795de7 3774 }
3e795de7
AD		 3775 }
3776
3e795de7
AD		 3777 return 0;
3778}
6db4063c 3779postcore_initcall(vtconsole_class_init);
3e795de7 3780
1da177e4
LT		 3781#endif
3782
3783/*
3784 * Screen blanking
3785 */
3786
403aac96 3787static int set_vesa_blanking(char __user *p)
1da177e4 3788{
403aac96
YY		 3789 unsigned int mode;
3790
3791 if (get_user(mode, p + 1))
3792 return -EFAULT;
3793
3794 vesa_blank_mode = (mode < 4) ? mode : 0;
3795 return 0;
1da177e4
LT		 3796}
3797
1da177e4
LT		 3798void do_blank_screen(int entering_gfx)
3799{
3800 struct vc_data *vc = vc_cons[fg_console].d;
3801 int i;
3802
3803 WARN_CONSOLE_UNLOCKED();
3804
3805 if (console_blanked) {
3806 if (blank_state == blank_vesa_wait) {
3807 blank_state = blank_off;
d060a321 3808 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3809 }
3810 return;
3811 }
1da177e4
LT		 3812
3813 /* entering graphics mode? */
3814 if (entering_gfx) {
3815 hide_cursor(vc);
3816 save_screen(vc);
3817 vc->vc_sw->con_blank(vc, -1, 1);
3818 console_blanked = fg_console + 1;
b6e8f00f 3819 blank_state = blank_off;
1da177e4
LT		 3820 set_origin(vc);
3821 return;
3822 }
3823
b6e8f00f 3824 if (blank_state != blank_normal_wait)
3825 return;
3826 blank_state = blank_off;
3827
1da177e4
LT		 3828 /* don't blank graphics */
3829 if (vc->vc_mode != KD_TEXT) {
3830 console_blanked = fg_console + 1;
3831 return;
3832 }
3833
3834 hide_cursor(vc);
3835 del_timer_sync(&console_timer);
3836 blank_timer_expired = 0;
3837
3838 save_screen(vc);
3839 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3840 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3841 console_blanked = fg_console + 1;
3842 if (i)
3843 set_origin(vc);
3844
3845 if (console_blank_hook && console_blank_hook(1))
3846 return;
3847
d060a321 3848 if (vesa_off_interval && vesa_blank_mode) {
030babac 3849 blank_state = blank_vesa_wait;
1da177e4
LT		 3850 mod_timer(&console_timer, jiffies + vesa_off_interval);
3851 }
8b92e87d 3852 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3853}
3854EXPORT_SYMBOL(do_blank_screen);
3855
3856/*
3857 * Called by timer as well as from vt_console_driver
3858 */
3859void do_unblank_screen(int leaving_gfx)
3860{
3861 struct vc_data *vc;
3862
3863 /* This should now always be called from a "sane" (read: can schedule)
3864 * context for the sake of the low level drivers, except in the special
3865 * case of oops_in_progress
3866 */
3867 if (!oops_in_progress)
3868 might_sleep();
3869
3870 WARN_CONSOLE_UNLOCKED();
3871
3872 ignore_poke = 0;
3873 if (!console_blanked)
3874 return;
3875 if (!vc_cons_allocated(fg_console)) {
3876 /* impossible */
e620e548
JP		 3877 pr_warn("unblank_screen: tty %d not allocated ??\n",
3878 fg_console + 1);
1da177e4
LT		 3879 return;
3880 }
3881 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3882 /* Try to unblank in oops case too */
3883 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3884 return; /* but leave console_blanked != 0 */
3885
3886 if (blankinterval) {
f324edc8 3887 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3888 blank_state = blank_normal_wait;
3889 }
3890
3891 console_blanked = 0;
8fd4bd22 3892 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3893 /* Low-level driver cannot restore -> do it ourselves */
3894 update_screen(vc);
3895 if (console_blank_hook)
3896 console_blank_hook(0);
3897 set_palette(vc);
3898 set_cursor(vc);
8b92e87d 3899 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3900}
3901EXPORT_SYMBOL(do_unblank_screen);
3902
3903/*
3904 * This is called by the outside world to cause a forced unblank, mostly for
3905 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3906 * call it with 1 as an argument and so force a mode restore... that may kill
3907 * X or at least garbage the screen but would also make the Oops visible...
3908 */
3909void unblank_screen(void)
3910{
3911 do_unblank_screen(0);
3912}
3913
3914/*
70522e12 3915 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3916 * (console operations can still happen at irq time, but only from printk which
70522e12 3917 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3918 */
3919static void blank_screen_t(unsigned long dummy)
3920{
cc63b1e1 3921 if (unlikely(!keventd_up())) {
f324edc8 3922 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3923 return;
3924 }
1da177e4
LT		 3925 blank_timer_expired = 1;
3926 schedule_work(&console_work);
3927}
3928
3929void poke_blanked_console(void)
3930{
3931 WARN_CONSOLE_UNLOCKED();
3932
3933 /* Add this so we quickly catch whoever might call us in a non
3934 * safe context. Nowadays, unblank_screen() isn't to be called in
3935 * atomic contexts and is allowed to schedule (with the special case
3936 * of oops_in_progress, but that isn't of any concern for this
3937 * function. --BenH.
3938 */
3939 might_sleep();
3940
3941 /* This isn't perfectly race free, but a race here would be mostly harmless,
3942 * at worse, we'll do a spurrious blank and it's unlikely
3943 */
3944 del_timer(&console_timer);
3945 blank_timer_expired = 0;
3946
3947 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3948 return;
3949 if (console_blanked)
3950 unblank_screen();
3951 else if (blankinterval) {
f324edc8 3952 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3953 blank_state = blank_normal_wait;
3954 }
3955}
3956
3957/*
3958 * Palettes
3959 */
3960
3961static void set_palette(struct vc_data *vc)
3962{
3963 WARN_CONSOLE_UNLOCKED();
3964
709280da 3965 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
1da177e4
LT		 3966 vc->vc_sw->con_set_palette(vc, color_table);
3967}
3968
1da177e4
LT		 3969/*
3970 * Load palette into the DAC registers. arg points to a colour
3971 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3972 */
3973
3974int con_set_cmap(unsigned char __user *arg)
3975{
871bdea6
MG		 3976 int i, j, k;
3977 unsigned char colormap[3*16];
3978
3979 if (copy_from_user(colormap, arg, sizeof(colormap)))
3980 return -EFAULT;
1da177e4 3981
ac751efa 3982 console_lock();
871bdea6
MG		 3983 for (i = k = 0; i < 16; i++) {
3984 default_red[i] = colormap[k++];
3985 default_grn[i] = colormap[k++];
3986 default_blu[i] = colormap[k++];
3987 }
3988 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3989 if (!vc_cons_allocated(i))
3990 continue;
3991 for (j = k = 0; j < 16; j++) {
3992 vc_cons[i].d->vc_palette[k++] = default_red[j];
3993 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3994 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3995 }
3996 set_palette(vc_cons[i].d);
3997 }
ac751efa 3998 console_unlock();
1da177e4 3999
871bdea6 4000 return 0;
1da177e4
LT		 4001}
4002
4003int con_get_cmap(unsigned char __user *arg)
4004{
871bdea6
MG		 4005 int i, k;
4006 unsigned char colormap[3*16];
1da177e4 4007
ac751efa 4008 console_lock();
871bdea6
MG		 4009 for (i = k = 0; i < 16; i++) {
4010 colormap[k++] = default_red[i];
4011 colormap[k++] = default_grn[i];
4012 colormap[k++] = default_blu[i];
4013 }
ac751efa 4014 console_unlock();
1da177e4 4015
871bdea6
MG		 4016 if (copy_to_user(arg, colormap, sizeof(colormap)))
4017 return -EFAULT;
4018
4019 return 0;
1da177e4
LT		 4020}
4021
4022void reset_palette(struct vc_data *vc)
4023{
4024 int j, k;
4025 for (j=k=0; j<16; j++) {
4026 vc->vc_palette[k++] = default_red[j];
4027 vc->vc_palette[k++] = default_grn[j];
4028 vc->vc_palette[k++] = default_blu[j];
4029 }
4030 set_palette(vc);
4031}
4032
4033/*
4034 * Font switching
4035 *
4036 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4037 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4038 * depending on width) reserved for each character which is kinda wasty, but
4039 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4040 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4041 * format (maybe we should add a `fontoffset' field to the `display'
4042 * structure so we won't have to convert the fontdata all the time.
4043 * /Jes
4044 */
4045
4046#define max_font_size 65536
4047
4048static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4049{
4050 struct console_font font;
4051 int rc = -EINVAL;
4052 int c;
4053
1da177e4
LT		 4054 if (op->data) {
4055 font.data = kmalloc(max_font_size, GFP_KERNEL);
4056 if (!font.data)
4057 return -ENOMEM;
4058 } else
4059 font.data = NULL;
4060
ac751efa 4061 console_lock();
edab558f
AC		 4062 if (vc->vc_mode != KD_TEXT)
4063 rc = -EINVAL;
4064 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4065 rc = vc->vc_sw->con_font_get(vc, &font);
4066 else
4067 rc = -ENOSYS;
ac751efa 4068 console_unlock();
1da177e4
LT		 4069
4070 if (rc)
4071 goto out;
4072
4073 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4074
1da177e4
LT		 4075 if (op->data && font.charcount > op->charcount)
4076 rc = -ENOSPC;
4077 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4078 if (font.width > op->width || font.height > op->height)
4079 rc = -ENOSPC;
4080 } else {
4081 if (font.width != 8)
4082 rc = -EIO;
4083 else if ((op->height && font.height > op->height) ||
4084 font.height > 32)
4085 rc = -ENOSPC;
4086 }
4087 if (rc)
4088 goto out;
4089
4090 op->height = font.height;
4091 op->width = font.width;
4092 op->charcount = font.charcount;
4093
4094 if (op->data && copy_to_user(op->data, font.data, c))
4095 rc = -EFAULT;
4096
4097out:
4098 kfree(font.data);
4099 return rc;
4100}
4101
4102static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4103{
4104 struct console_font font;
4105 int rc = -EINVAL;
4106 int size;
4107
4108 if (vc->vc_mode != KD_TEXT)
4109 return -EINVAL;
4110 if (!op->data)
4111 return -EINVAL;
4112 if (op->charcount > 512)
4113 return -EINVAL;
4114 if (!op->height) { /* Need to guess font height [compat] */
4115 int h, i;
4116 u8 __user *charmap = op->data;
4117 u8 tmp;
4118
4119 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4120 so that we can get rid of this soon */
4121 if (!(op->flags & KD_FONT_FLAG_OLD))
4122 return -EINVAL;
4123 for (h = 32; h > 0; h--)
4124 for (i = 0; i < op->charcount; i++) {
4125 if (get_user(tmp, &charmap[32*i+h-1]))
4126 return -EFAULT;
4127 if (tmp)
4128 goto nonzero;
4129 }
4130 return -EINVAL;
4131 nonzero:
4132 op->height = h;
4133 }
4134 if (op->width <= 0 || op->width > 32 || op->height > 32)
4135 return -EINVAL;
4136 size = (op->width+7)/8 * 32 * op->charcount;
4137 if (size > max_font_size)
4138 return -ENOSPC;
4139 font.charcount = op->charcount;
4140 font.height = op->height;
4141 font.width = op->width;
9b71ca20
JL		 4142 font.data = memdup_user(op->data, size);
4143 if (IS_ERR(font.data))
4144 return PTR_ERR(font.data);
ac751efa 4145 console_lock();
edab558f
AC		 4146 if (vc->vc_mode != KD_TEXT)
4147 rc = -EINVAL;
4148 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4149 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4150 else
4151 rc = -ENOSYS;
ac751efa 4152 console_unlock();
1da177e4
LT		 4153 kfree(font.data);
4154 return rc;
4155}
4156
4157static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4158{
4159 struct console_font font = {.width = op->width, .height = op->height};
4160 char name[MAX_FONT_NAME];
4161 char *s = name;
4162 int rc;
4163
1da177e4
LT		 4164
4165 if (!op->data)
4166 s = NULL;
4167 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4168 return -EFAULT;
4169 else
4170 name[MAX_FONT_NAME - 1] = 0;
4171
ac751efa 4172 console_lock();
edab558f
AC		 4173 if (vc->vc_mode != KD_TEXT) {
4174 console_unlock();
4175 return -EINVAL;
4176 }
1da177e4
LT		 4177 if (vc->vc_sw->con_font_default)
4178 rc = vc->vc_sw->con_font_default(vc, &font, s);
4179 else
4180 rc = -ENOSYS;
ac751efa 4181 console_unlock();
1da177e4
LT		 4182 if (!rc) {
4183 op->width = font.width;
4184 op->height = font.height;
4185 }
4186 return rc;
4187}
4188
4189static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4190{
4191 int con = op->height;
4192 int rc;
4193
1da177e4 4194
ac751efa 4195 console_lock();
edab558f
AC		 4196 if (vc->vc_mode != KD_TEXT)
4197 rc = -EINVAL;
4198 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4199 rc = -ENOSYS;
4200 else if (con < 0 || !vc_cons_allocated(con))
4201 rc = -ENOTTY;
4202 else if (con == vc->vc_num) /* nothing to do */
4203 rc = 0;
4204 else
4205 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4206 console_unlock();
1da177e4
LT		 4207 return rc;
4208}
4209
4210int con_font_op(struct vc_data *vc, struct console_font_op *op)
4211{
4212 switch (op->op) {
4213 case KD_FONT_OP_SET:
4214 return con_font_set(vc, op);
4215 case KD_FONT_OP_GET:
4216 return con_font_get(vc, op);
4217 case KD_FONT_OP_SET_DEFAULT:
4218 return con_font_default(vc, op);
4219 case KD_FONT_OP_COPY:
4220 return con_font_copy(vc, op);
4221 }
4222 return -ENOSYS;
4223}
4224
4225/*
4226 * Interface exported to selection and vcs.
4227 */
4228
4229/* used by selection */
4230u16 screen_glyph(struct vc_data *vc, int offset)
4231{
4232 u16 w = scr_readw(screenpos(vc, offset, 1));
4233 u16 c = w & 0xff;
4234
4235 if (w & vc->vc_hi_font_mask)
4236 c |= 0x100;
4237 return c;
4238}
f7511d5f 4239EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4240
4241/* used by vcs - note the word offset */
4242unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4243{
4244 return screenpos(vc, 2 * w_offset, viewed);
4245}
88867e3d 4246EXPORT_SYMBOL_GPL(screen_pos);
1da177e4
LT		 4247
4248void getconsxy(struct vc_data *vc, unsigned char *p)
4249{
4250 p[0] = vc->vc_x;
4251 p[1] = vc->vc_y;
4252}
4253
4254void putconsxy(struct vc_data *vc, unsigned char *p)
4255{
9477e260 4256 hide_cursor(vc);
1da177e4
LT		 4257 gotoxy(vc, p[0], p[1]);
4258 set_cursor(vc);
4259}
4260
4261u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4262{
4263 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4264 return softcursor_original;
4265 return scr_readw(org);
4266}
4267
4268void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4269{
4270 scr_writew(val, org);
4271 if ((unsigned long)org == vc->vc_pos) {
4272 softcursor_original = -1;
4273 add_softcursor(vc);
4274 }
4275}
4276
432c9ed2
NP		 4277void vcs_scr_updated(struct vc_data *vc)
4278{
4279 notify_update(vc);
4280}
4281
35cc56f9
JS		 4282void vc_scrolldelta_helper(struct vc_data *c, int lines,
4283 unsigned int rolled_over, void *base, unsigned int size)
4284{
4285 unsigned long ubase = (unsigned long)base;
4286 int margin = c->vc_size_row * 4;
4287 int ul, we, p, st;
4288
4289 /* Turn scrollback off */
4290 if (!lines) {
4291 c->vc_visible_origin = c->vc_origin;
4292 return;
4293 }
4294
4295 /* Do we have already enough to allow jumping from 0 to the end? */
4296 if (rolled_over > (c->vc_scr_end - ubase) + margin) {
4297 ul = c->vc_scr_end - ubase;
4298 we = rolled_over + c->vc_size_row;
4299 } else {
4300 ul = 0;
4301 we = size;
4302 }
4303
4304 p = (c->vc_visible_origin - ubase - ul + we) % we +
4305 lines * c->vc_size_row;
4306 st = (c->vc_origin - ubase - ul + we) % we;
4307
4308 /* Only a little piece would be left? Show all incl. the piece! */
4309 if (st < 2 * margin)
4310 margin = 0;
4311 if (p < margin)
4312 p = 0;
4313 if (p > st - margin)
4314 p = st;
4315
4316 c->vc_visible_origin = ubase + (p + ul) % we;
4317}
4318EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4319
1da177e4
LT		 4320/*
4321 * Visible symbols for modules
4322 */
4323
4324EXPORT_SYMBOL(color_table);
4325EXPORT_SYMBOL(default_red);
4326EXPORT_SYMBOL(default_grn);
4327EXPORT_SYMBOL(default_blu);
4328EXPORT_SYMBOL(update_region);
4329EXPORT_SYMBOL(redraw_screen);
4330EXPORT_SYMBOL(vc_resize);
4331EXPORT_SYMBOL(fg_console);
4332EXPORT_SYMBOL(console_blank_hook);
4333EXPORT_SYMBOL(console_blanked);
4334EXPORT_SYMBOL(vc_cons);
f6c06b68 4335EXPORT_SYMBOL(global_cursor_default);
1da177e4 4336#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4337EXPORT_SYMBOL(give_up_console);
4338#endif
Linux 6.x block layer and io_uring tree(s)