Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6.git] / drivers / char / vt.c
1 /*
2  *  linux/drivers/char/vt.c
3  *
4  *  Copyright (C) 1991, 1992  Linus Torvalds
5  */
6
7 /*
8  * Hopefully this will be a rather complete VT102 implementation.
9  *
10  * Beeping thanks to John T Kohl.
11  *
12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13  *   Chars, and VT100 enhancements by Peter MacDonald.
14  *
15  * Copy and paste function by Andrew Haylett,
16  *   some enhancements by Alessandro Rubini.
17  *
18  * Code to check for different video-cards mostly by Galen Hunt,
19  * <g-hunt@ee.utah.edu>
20  *
21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23  *
24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25  * Resizing of consoles, aeb, 940926
26  *
27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28  * <poe@daimi.aau.dk>
29  *
30  * User-defined bell sound, new setterm control sequences and printk
31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32  *
33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34  *
35  * Merge with the abstract console driver by Geert Uytterhoeven
36  * <geert@linux-m68k.org>, Jan 1997.
37  *
38  *   Original m68k console driver modifications by
39  *
40  *     - Arno Griffioen <arno@usn.nl>
41  *     - David Carter <carter@cs.bris.ac.uk>
42  * 
43  *   The abstract console driver provides a generic interface for a text
44  *   console. It supports VGA text mode, frame buffer based graphical consoles
45  *   and special graphics processors that are only accessible through some
46  *   registers (e.g. a TMS340x0 GSP).
47  *
48  *   The interface to the hardware is specified using a special structure
49  *   (struct consw) which contains function pointers to console operations
50  *   (see <linux/console.h> for more information).
51  *
52  * Support for changeable cursor shape
53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54  *
55  * Ported to i386 and con_scrolldelta fixed
56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
57  *
58  * Resurrected character buffers in videoram plus lots of other trickery
59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60  *
61  * Removed old-style timers, introduced console_timer, made timer
62  * deletion SMP-safe.  17Jun00, Andrew Morton <andrewm@uow.edu.au>
63  *
64  * Removed console_lock, enabled interrupts across all console operations
65  * 13 March 2001, Andrew Morton
66  *
67  * Fixed UTF-8 mode so alternate charset modes always work according
68  * to control sequences interpreted in do_con_trol function
69  * preserving backward VT100 semigraphics compatibility,
70  * malformed UTF sequences represented as sequences of replacement glyphs,
71  * original codes or '?' as a last resort if replacement glyph is undefined
72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
73  */
74
75 #include <linux/module.h>
76 #include <linux/types.h>
77 #include <linux/sched.h>
78 #include <linux/tty.h>
79 #include <linux/tty_flip.h>
80 #include <linux/kernel.h>
81 #include <linux/string.h>
82 #include <linux/errno.h>
83 #include <linux/kd.h>
84 #include <linux/slab.h>
85 #include <linux/major.h>
86 #include <linux/mm.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/vt_kern.h>
90 #include <linux/selection.h>
91 #include <linux/tiocl.h>
92 #include <linux/kbd_kern.h>
93 #include <linux/consolemap.h>
94 #include <linux/timer.h>
95 #include <linux/interrupt.h>
96 #include <linux/workqueue.h>
97 #include <linux/bootmem.h>
98 #include <linux/pm.h>
99 #include <linux/font.h>
100 #include <linux/bitops.h>
101
102 #include <asm/io.h>
103 #include <asm/system.h>
104 #include <asm/uaccess.h>
105
106 #define MAX_NR_CON_DRIVER 16
107
108 #define CON_DRIVER_FLAG_MODULE 1
109 #define CON_DRIVER_FLAG_INIT   2
110 #define CON_DRIVER_FLAG_ATTR   4
111
112 struct con_driver {
113         const struct consw *con;
114         const char *desc;
115         struct device *dev;
116         int node;
117         int first;
118         int last;
119         int flag;
120 };
121
122 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
123 const struct consw *conswitchp;
124
125 /* A bitmap for codes <32. A bit of 1 indicates that the code
126  * corresponding to that bit number invokes some special action
127  * (such as cursor movement) and should not be displayed as a
128  * glyph unless the disp_ctrl mode is explicitly enabled.
129  */
130 #define CTRL_ACTION 0x0d00ff81
131 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
132
133 /*
134  * Here is the default bell parameters: 750HZ, 1/8th of a second
135  */
136 #define DEFAULT_BELL_PITCH      750
137 #define DEFAULT_BELL_DURATION   (HZ/8)
138
139 extern void vcs_make_sysfs(struct tty_struct *tty);
140 extern void vcs_remove_sysfs(struct tty_struct *tty);
141
142 struct vc vc_cons [MAX_NR_CONSOLES];
143
144 #ifndef VT_SINGLE_DRIVER
145 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
146 #endif
147
148 static int con_open(struct tty_struct *, struct file *);
149 static void vc_init(struct vc_data *vc, unsigned int rows,
150                     unsigned int cols, int do_clear);
151 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
152 static void save_cur(struct vc_data *vc);
153 static void reset_terminal(struct vc_data *vc, int do_clear);
154 static void con_flush_chars(struct tty_struct *tty);
155 static void set_vesa_blanking(char __user *p);
156 static void set_cursor(struct vc_data *vc);
157 static void hide_cursor(struct vc_data *vc);
158 static void console_callback(struct work_struct *ignored);
159 static void blank_screen_t(unsigned long dummy);
160 static void set_palette(struct vc_data *vc);
161
162 static int printable;           /* Is console ready for printing? */
163
164 /*
165  * ignore_poke: don't unblank the screen when things are typed.  This is
166  * mainly for the privacy of braille terminal users.
167  */
168 static int ignore_poke;
169
170 int do_poke_blanked_console;
171 int console_blanked;
172
173 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
174 static int blankinterval = 10*60*HZ;
175 static int vesa_off_interval;
176
177 static DECLARE_WORK(console_work, console_callback);
178
179 /*
180  * fg_console is the current virtual console,
181  * last_console is the last used one,
182  * want_console is the console we want to switch to,
183  * kmsg_redirect is the console for kernel messages,
184  */
185 int fg_console;
186 int last_console;
187 int want_console = -1;
188 int kmsg_redirect;
189
190 /*
191  * For each existing display, we have a pointer to console currently visible
192  * on that display, allowing consoles other than fg_console to be refreshed
193  * appropriately. Unless the low-level driver supplies its own display_fg
194  * variable, we use this one for the "master display".
195  */
196 static struct vc_data *master_display_fg;
197
198 /*
199  * Unfortunately, we need to delay tty echo when we're currently writing to the
200  * console since the code is (and always was) not re-entrant, so we schedule
201  * all flip requests to process context with schedule-task() and run it from
202  * console_callback().
203  */
204
205 /*
206  * For the same reason, we defer scrollback to the console callback.
207  */
208 static int scrollback_delta;
209
210 /*
211  * Hook so that the power management routines can (un)blank
212  * the console on our behalf.
213  */
214 int (*console_blank_hook)(int);
215
216 static struct timer_list console_timer;
217 static int blank_state;
218 static int blank_timer_expired;
219 enum {
220         blank_off = 0,
221         blank_normal_wait,
222         blank_vesa_wait,
223 };
224
225 /*
226  *      Low-Level Functions
227  */
228
229 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
230
231 #ifdef VT_BUF_VRAM_ONLY
232 #define DO_UPDATE(vc)   0
233 #else
234 #define DO_UPDATE(vc)   CON_IS_VISIBLE(vc)
235 #endif
236
237 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
238 {
239         unsigned short *p;
240         
241         if (!viewed)
242                 p = (unsigned short *)(vc->vc_origin + offset);
243         else if (!vc->vc_sw->con_screen_pos)
244                 p = (unsigned short *)(vc->vc_visible_origin + offset);
245         else
246                 p = vc->vc_sw->con_screen_pos(vc, offset);
247         return p;
248 }
249
250 static inline void scrolldelta(int lines)
251 {
252         scrollback_delta += lines;
253         schedule_console_callback();
254 }
255
256 void schedule_console_callback(void)
257 {
258         schedule_work(&console_work);
259 }
260
261 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
262 {
263         unsigned short *d, *s;
264
265         if (t+nr >= b)
266                 nr = b - t - 1;
267         if (b > vc->vc_rows || t >= b || nr < 1)
268                 return;
269         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
270                 return;
271         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
272         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
273         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
274         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
275                     vc->vc_size_row * nr);
276 }
277
278 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
279 {
280         unsigned short *s;
281         unsigned int step;
282
283         if (t+nr >= b)
284                 nr = b - t - 1;
285         if (b > vc->vc_rows || t >= b || nr < 1)
286                 return;
287         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
288                 return;
289         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
290         step = vc->vc_cols * nr;
291         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
292         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
293 }
294
295 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
296 {
297 #ifndef VT_BUF_VRAM_ONLY
298         unsigned int xx, yy, offset;
299         u16 *p;
300
301         p = (u16 *) start;
302         if (!vc->vc_sw->con_getxy) {
303                 offset = (start - vc->vc_origin) / 2;
304                 xx = offset % vc->vc_cols;
305                 yy = offset / vc->vc_cols;
306         } else {
307                 int nxx, nyy;
308                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
309                 xx = nxx; yy = nyy;
310         }
311         for(;;) {
312                 u16 attrib = scr_readw(p) & 0xff00;
313                 int startx = xx;
314                 u16 *q = p;
315                 while (xx < vc->vc_cols && count) {
316                         if (attrib != (scr_readw(p) & 0xff00)) {
317                                 if (p > q)
318                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
319                                 startx = xx;
320                                 q = p;
321                                 attrib = scr_readw(p) & 0xff00;
322                         }
323                         p++;
324                         xx++;
325                         count--;
326                 }
327                 if (p > q)
328                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
329                 if (!count)
330                         break;
331                 xx = 0;
332                 yy++;
333                 if (vc->vc_sw->con_getxy) {
334                         p = (u16 *)start;
335                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
336                 }
337         }
338 #endif
339 }
340
341 void update_region(struct vc_data *vc, unsigned long start, int count)
342 {
343         WARN_CONSOLE_UNLOCKED();
344
345         if (DO_UPDATE(vc)) {
346                 hide_cursor(vc);
347                 do_update_region(vc, start, count);
348                 set_cursor(vc);
349         }
350 }
351
352 /* Structure of attributes is hardware-dependent */
353
354 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse)
355 {
356         if (vc->vc_sw->con_build_attr)
357                 return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse);
358
359 #ifndef VT_BUF_VRAM_ONLY
360 /*
361  * ++roman: I completely changed the attribute format for monochrome
362  * mode (!can_do_color). The formerly used MDA (monochrome display
363  * adapter) format didn't allow the combination of certain effects.
364  * Now the attribute is just a bit vector:
365  *  Bit 0..1: intensity (0..2)
366  *  Bit 2   : underline
367  *  Bit 3   : reverse
368  *  Bit 7   : blink
369  */
370         {
371         u8 a = vc->vc_color;
372         if (!vc->vc_can_do_color)
373                 return _intensity |
374                        (_underline ? 4 : 0) |
375                        (_reverse ? 8 : 0) |
376                        (_blink ? 0x80 : 0);
377         if (_underline)
378                 a = (a & 0xf0) | vc->vc_ulcolor;
379         else if (_intensity == 0)
380                 a = (a & 0xf0) | vc->vc_ulcolor;
381         if (_reverse)
382                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
383         if (_blink)
384                 a ^= 0x80;
385         if (_intensity == 2)
386                 a ^= 0x08;
387         if (vc->vc_hi_font_mask == 0x100)
388                 a <<= 1;
389         return a;
390         }
391 #else
392         return 0;
393 #endif
394 }
395
396 static void update_attr(struct vc_data *vc)
397 {
398         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm);
399         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm) << 8) | ' ';
400 }
401
402 /* Note: inverting the screen twice should revert to the original state */
403 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
404 {
405         unsigned short *p;
406
407         WARN_CONSOLE_UNLOCKED();
408
409         count /= 2;
410         p = screenpos(vc, offset, viewed);
411         if (vc->vc_sw->con_invert_region)
412                 vc->vc_sw->con_invert_region(vc, p, count);
413 #ifndef VT_BUF_VRAM_ONLY
414         else {
415                 u16 *q = p;
416                 int cnt = count;
417                 u16 a;
418
419                 if (!vc->vc_can_do_color) {
420                         while (cnt--) {
421                             a = scr_readw(q);
422                             a ^= 0x0800;
423                             scr_writew(a, q);
424                             q++;
425                         }
426                 } else if (vc->vc_hi_font_mask == 0x100) {
427                         while (cnt--) {
428                                 a = scr_readw(q);
429                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
430                                 scr_writew(a, q);
431                                 q++;
432                         }
433                 } else {
434                         while (cnt--) {
435                                 a = scr_readw(q);
436                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
437                                 scr_writew(a, q);
438                                 q++;
439                         }
440                 }
441         }
442 #endif
443         if (DO_UPDATE(vc))
444                 do_update_region(vc, (unsigned long) p, count);
445 }
446
447 /* used by selection: complement pointer position */
448 void complement_pos(struct vc_data *vc, int offset)
449 {
450         static int old_offset = -1;
451         static unsigned short old;
452         static unsigned short oldx, oldy;
453
454         WARN_CONSOLE_UNLOCKED();
455
456         if (old_offset != -1 && old_offset >= 0 &&
457             old_offset < vc->vc_screenbuf_size) {
458                 scr_writew(old, screenpos(vc, old_offset, 1));
459                 if (DO_UPDATE(vc))
460                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
461         }
462
463         old_offset = offset;
464
465         if (offset != -1 && offset >= 0 &&
466             offset < vc->vc_screenbuf_size) {
467                 unsigned short new;
468                 unsigned short *p;
469                 p = screenpos(vc, offset, 1);
470                 old = scr_readw(p);
471                 new = old ^ vc->vc_complement_mask;
472                 scr_writew(new, p);
473                 if (DO_UPDATE(vc)) {
474                         oldx = (offset >> 1) % vc->vc_cols;
475                         oldy = (offset >> 1) / vc->vc_cols;
476                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
477                 }
478         }
479
480 }
481
482 static void insert_char(struct vc_data *vc, unsigned int nr)
483 {
484         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
485
486         p = q + vc->vc_cols - nr - vc->vc_x;
487         while (--p >= q)
488                 scr_writew(scr_readw(p), p + nr);
489         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
490         vc->vc_need_wrap = 0;
491         if (DO_UPDATE(vc)) {
492                 unsigned short oldattr = vc->vc_attr;
493                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
494                                      vc->vc_cols - vc->vc_x - nr);
495                 vc->vc_attr = vc->vc_video_erase_char >> 8;
496                 while (nr--)
497                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
498                 vc->vc_attr = oldattr;
499         }
500 }
501
502 static void delete_char(struct vc_data *vc, unsigned int nr)
503 {
504         unsigned int i = vc->vc_x;
505         unsigned short *p = (unsigned short *)vc->vc_pos;
506
507         while (++i <= vc->vc_cols - nr) {
508                 scr_writew(scr_readw(p+nr), p);
509                 p++;
510         }
511         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
512         vc->vc_need_wrap = 0;
513         if (DO_UPDATE(vc)) {
514                 unsigned short oldattr = vc->vc_attr;
515                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
516                                      vc->vc_cols - vc->vc_x - nr);
517                 vc->vc_attr = vc->vc_video_erase_char >> 8;
518                 while (nr--)
519                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
520                                      vc->vc_cols - 1 - nr);
521                 vc->vc_attr = oldattr;
522         }
523 }
524
525 static int softcursor_original;
526
527 static void add_softcursor(struct vc_data *vc)
528 {
529         int i = scr_readw((u16 *) vc->vc_pos);
530         u32 type = vc->vc_cursor_type;
531
532         if (! (type & 0x10)) return;
533         if (softcursor_original != -1) return;
534         softcursor_original = i;
535         i |= ((type >> 8) & 0xff00 );
536         i ^= ((type) & 0xff00 );
537         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
538         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
539         scr_writew(i, (u16 *) vc->vc_pos);
540         if (DO_UPDATE(vc))
541                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
542 }
543
544 static void hide_softcursor(struct vc_data *vc)
545 {
546         if (softcursor_original != -1) {
547                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
548                 if (DO_UPDATE(vc))
549                         vc->vc_sw->con_putc(vc, softcursor_original,
550                                         vc->vc_y, vc->vc_x);
551                 softcursor_original = -1;
552         }
553 }
554
555 static void hide_cursor(struct vc_data *vc)
556 {
557         if (vc == sel_cons)
558                 clear_selection();
559         vc->vc_sw->con_cursor(vc, CM_ERASE);
560         hide_softcursor(vc);
561 }
562
563 static void set_cursor(struct vc_data *vc)
564 {
565         if (!IS_FG(vc) || console_blanked ||
566             vc->vc_mode == KD_GRAPHICS)
567                 return;
568         if (vc->vc_deccm) {
569                 if (vc == sel_cons)
570                         clear_selection();
571                 add_softcursor(vc);
572                 if ((vc->vc_cursor_type & 0x0f) != 1)
573                         vc->vc_sw->con_cursor(vc, CM_DRAW);
574         } else
575                 hide_cursor(vc);
576 }
577
578 static void set_origin(struct vc_data *vc)
579 {
580         WARN_CONSOLE_UNLOCKED();
581
582         if (!CON_IS_VISIBLE(vc) ||
583             !vc->vc_sw->con_set_origin ||
584             !vc->vc_sw->con_set_origin(vc))
585                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
586         vc->vc_visible_origin = vc->vc_origin;
587         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
588         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
589 }
590
591 static inline void save_screen(struct vc_data *vc)
592 {
593         WARN_CONSOLE_UNLOCKED();
594
595         if (vc->vc_sw->con_save_screen)
596                 vc->vc_sw->con_save_screen(vc);
597 }
598
599 /*
600  *      Redrawing of screen
601  */
602
603 static void clear_buffer_attributes(struct vc_data *vc)
604 {
605         unsigned short *p = (unsigned short *)vc->vc_origin;
606         int count = vc->vc_screenbuf_size / 2;
607         int mask = vc->vc_hi_font_mask | 0xff;
608
609         for (; count > 0; count--, p++) {
610                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
611         }
612 }
613
614 void redraw_screen(struct vc_data *vc, int is_switch)
615 {
616         int redraw = 0;
617
618         WARN_CONSOLE_UNLOCKED();
619
620         if (!vc) {
621                 /* strange ... */
622                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
623                 return;
624         }
625
626         if (is_switch) {
627                 struct vc_data *old_vc = vc_cons[fg_console].d;
628                 if (old_vc == vc)
629                         return;
630                 if (!CON_IS_VISIBLE(vc))
631                         redraw = 1;
632                 *vc->vc_display_fg = vc;
633                 fg_console = vc->vc_num;
634                 hide_cursor(old_vc);
635                 if (!CON_IS_VISIBLE(old_vc)) {
636                         save_screen(old_vc);
637                         set_origin(old_vc);
638                 }
639         } else {
640                 hide_cursor(vc);
641                 redraw = 1;
642         }
643
644         if (redraw) {
645                 int update;
646                 int old_was_color = vc->vc_can_do_color;
647
648                 set_origin(vc);
649                 update = vc->vc_sw->con_switch(vc);
650                 set_palette(vc);
651                 /*
652                  * If console changed from mono<->color, the best we can do
653                  * is to clear the buffer attributes. As it currently stands,
654                  * rebuilding new attributes from the old buffer is not doable
655                  * without overly complex code.
656                  */
657                 if (old_was_color != vc->vc_can_do_color) {
658                         update_attr(vc);
659                         clear_buffer_attributes(vc);
660                 }
661                 if (update && vc->vc_mode != KD_GRAPHICS)
662                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
663         }
664         set_cursor(vc);
665         if (is_switch) {
666                 set_leds();
667                 compute_shiftstate();
668         }
669 }
670
671 /*
672  *      Allocation, freeing and resizing of VTs.
673  */
674
675 int vc_cons_allocated(unsigned int i)
676 {
677         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
678 }
679
680 static void visual_init(struct vc_data *vc, int num, int init)
681 {
682         /* ++Geert: vc->vc_sw->con_init determines console size */
683         if (vc->vc_sw)
684                 module_put(vc->vc_sw->owner);
685         vc->vc_sw = conswitchp;
686 #ifndef VT_SINGLE_DRIVER
687         if (con_driver_map[num])
688                 vc->vc_sw = con_driver_map[num];
689 #endif
690         __module_get(vc->vc_sw->owner);
691         vc->vc_num = num;
692         vc->vc_display_fg = &master_display_fg;
693         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
694         vc->vc_uni_pagedir = 0;
695         vc->vc_hi_font_mask = 0;
696         vc->vc_complement_mask = 0;
697         vc->vc_can_do_color = 0;
698         vc->vc_sw->con_init(vc, init);
699         if (!vc->vc_complement_mask)
700                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
701         vc->vc_s_complement_mask = vc->vc_complement_mask;
702         vc->vc_size_row = vc->vc_cols << 1;
703         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
704 }
705
706 int vc_allocate(unsigned int currcons)  /* return 0 on success */
707 {
708         WARN_CONSOLE_UNLOCKED();
709
710         if (currcons >= MAX_NR_CONSOLES)
711                 return -ENXIO;
712         if (!vc_cons[currcons].d) {
713             struct vc_data *vc;
714
715             /* prevent users from taking too much memory */
716             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
717               return -EPERM;
718
719             /* due to the granularity of kmalloc, we waste some memory here */
720             /* the alloc is done in two steps, to optimize the common situation
721                of a 25x80 console (structsize=216, screenbuf_size=4000) */
722             /* although the numbers above are not valid since long ago, the
723                point is still up-to-date and the comment still has its value
724                even if only as a historical artifact.  --mj, July 1998 */
725             vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
726             if (!vc)
727                 return -ENOMEM;
728             memset(vc, 0, sizeof(*vc));
729             vc_cons[currcons].d = vc;
730             visual_init(vc, currcons, 1);
731             if (!*vc->vc_uni_pagedir_loc)
732                 con_set_default_unimap(vc);
733             if (!vc->vc_kmalloced)
734                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
735             if (!vc->vc_screenbuf) {
736                 kfree(vc);
737                 vc_cons[currcons].d = NULL;
738                 return -ENOMEM;
739             }
740             vc->vc_kmalloced = 1;
741             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
742         }
743         return 0;
744 }
745
746 static inline int resize_screen(struct vc_data *vc, int width, int height)
747 {
748         /* Resizes the resolution of the display adapater */
749         int err = 0;
750
751         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
752                 err = vc->vc_sw->con_resize(vc, width, height);
753         return err;
754 }
755
756 /*
757  * Change # of rows and columns (0 means unchanged/the size of fg_console)
758  * [this is to be used together with some user program
759  * like resize that changes the hardware videomode]
760  */
761 #define VC_RESIZE_MAXCOL (32767)
762 #define VC_RESIZE_MAXROW (32767)
763 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
764 {
765         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
766         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
767         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
768         unsigned int end;
769         unsigned short *newscreen;
770
771         WARN_CONSOLE_UNLOCKED();
772
773         if (!vc)
774                 return -ENXIO;
775
776         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
777                 return -EINVAL;
778
779         new_cols = (cols ? cols : vc->vc_cols);
780         new_rows = (lines ? lines : vc->vc_rows);
781         new_row_size = new_cols << 1;
782         new_screen_size = new_row_size * new_rows;
783
784         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
785                 return 0;
786
787         newscreen = (unsigned short *) kmalloc(new_screen_size, GFP_USER);
788         if (!newscreen)
789                 return -ENOMEM;
790
791         old_rows = vc->vc_rows;
792         old_cols = vc->vc_cols;
793         old_row_size = vc->vc_size_row;
794         old_screen_size = vc->vc_screenbuf_size;
795
796         err = resize_screen(vc, new_cols, new_rows);
797         if (err) {
798                 kfree(newscreen);
799                 return err;
800         }
801
802         vc->vc_rows = new_rows;
803         vc->vc_cols = new_cols;
804         vc->vc_size_row = new_row_size;
805         vc->vc_screenbuf_size = new_screen_size;
806
807         rlth = min(old_row_size, new_row_size);
808         rrem = new_row_size - rlth;
809         old_origin = vc->vc_origin;
810         new_origin = (long) newscreen;
811         new_scr_end = new_origin + new_screen_size;
812
813         if (vc->vc_y > new_rows) {
814                 if (old_rows - vc->vc_y < new_rows) {
815                         /*
816                          * Cursor near the bottom, copy contents from the
817                          * bottom of buffer
818                          */
819                         old_origin += (old_rows - new_rows) * old_row_size;
820                         end = vc->vc_scr_end;
821                 } else {
822                         /*
823                          * Cursor is in no man's land, copy 1/2 screenful
824                          * from the top and bottom of cursor position
825                          */
826                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
827                         end = old_origin + (old_row_size * new_rows);
828                 }
829         } else
830                 /*
831                  * Cursor near the top, copy contents from the top of buffer
832                  */
833                 end = (old_rows > new_rows) ? old_origin +
834                         (old_row_size * new_rows) :
835                         vc->vc_scr_end;
836
837         update_attr(vc);
838
839         while (old_origin < end) {
840                 scr_memcpyw((unsigned short *) new_origin,
841                             (unsigned short *) old_origin, rlth);
842                 if (rrem)
843                         scr_memsetw((void *)(new_origin + rlth),
844                                     vc->vc_video_erase_char, rrem);
845                 old_origin += old_row_size;
846                 new_origin += new_row_size;
847         }
848         if (new_scr_end > new_origin)
849                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
850                             new_scr_end - new_origin);
851         if (vc->vc_kmalloced)
852                 kfree(vc->vc_screenbuf);
853         vc->vc_screenbuf = newscreen;
854         vc->vc_kmalloced = 1;
855         vc->vc_screenbuf_size = new_screen_size;
856         set_origin(vc);
857
858         /* do part of a reset_terminal() */
859         vc->vc_top = 0;
860         vc->vc_bottom = vc->vc_rows;
861         gotoxy(vc, vc->vc_x, vc->vc_y);
862         save_cur(vc);
863
864         if (vc->vc_tty) {
865                 struct winsize ws, *cws = &vc->vc_tty->winsize;
866
867                 memset(&ws, 0, sizeof(ws));
868                 ws.ws_row = vc->vc_rows;
869                 ws.ws_col = vc->vc_cols;
870                 ws.ws_ypixel = vc->vc_scan_lines;
871                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
872                     vc->vc_tty->pgrp > 0)
873                         kill_pg(vc->vc_tty->pgrp, SIGWINCH, 1);
874                 *cws = ws;
875         }
876
877         if (CON_IS_VISIBLE(vc))
878                 update_screen(vc);
879         return err;
880 }
881
882 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
883 {
884         int rc;
885
886         acquire_console_sem();
887         rc = vc_resize(vc, cols, lines);
888         release_console_sem();
889         return rc;
890 }
891
892 void vc_deallocate(unsigned int currcons)
893 {
894         WARN_CONSOLE_UNLOCKED();
895
896         if (vc_cons_allocated(currcons)) {
897                 struct vc_data *vc = vc_cons[currcons].d;
898                 vc->vc_sw->con_deinit(vc);
899                 put_pid(vc->vt_pid);
900                 module_put(vc->vc_sw->owner);
901                 if (vc->vc_kmalloced)
902                         kfree(vc->vc_screenbuf);
903                 if (currcons >= MIN_NR_CONSOLES)
904                         kfree(vc);
905                 vc_cons[currcons].d = NULL;
906         }
907 }
908
909 /*
910  *      VT102 emulator
911  */
912
913 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
914 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
915 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
916
917 #define decarm          VC_REPEAT
918 #define decckm          VC_CKMODE
919 #define kbdapplic       VC_APPLIC
920 #define lnm             VC_CRLF
921
922 /*
923  * this is what the terminal answers to a ESC-Z or csi0c query.
924  */
925 #define VT100ID "\033[?1;2c"
926 #define VT102ID "\033[?6c"
927
928 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
929                                        8,12,10,14, 9,13,11,15 };
930
931 /* the default colour table, for VGA+ colour systems */
932 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
933     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
934 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
935     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
936 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
937     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
938
939 /*
940  * gotoxy() must verify all boundaries, because the arguments
941  * might also be negative. If the given position is out of
942  * bounds, the cursor is placed at the nearest margin.
943  */
944 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
945 {
946         int min_y, max_y;
947
948         if (new_x < 0)
949                 vc->vc_x = 0;
950         else {
951                 if (new_x >= vc->vc_cols)
952                         vc->vc_x = vc->vc_cols - 1;
953                 else
954                         vc->vc_x = new_x;
955         }
956
957         if (vc->vc_decom) {
958                 min_y = vc->vc_top;
959                 max_y = vc->vc_bottom;
960         } else {
961                 min_y = 0;
962                 max_y = vc->vc_rows;
963         }
964         if (new_y < min_y)
965                 vc->vc_y = min_y;
966         else if (new_y >= max_y)
967                 vc->vc_y = max_y - 1;
968         else
969                 vc->vc_y = new_y;
970         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
971         vc->vc_need_wrap = 0;
972 }
973
974 /* for absolute user moves, when decom is set */
975 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
976 {
977         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
978 }
979
980 void scrollback(struct vc_data *vc, int lines)
981 {
982         if (!lines)
983                 lines = vc->vc_rows / 2;
984         scrolldelta(-lines);
985 }
986
987 void scrollfront(struct vc_data *vc, int lines)
988 {
989         if (!lines)
990                 lines = vc->vc_rows / 2;
991         scrolldelta(lines);
992 }
993
994 static void lf(struct vc_data *vc)
995 {
996         /* don't scroll if above bottom of scrolling region, or
997          * if below scrolling region
998          */
999         if (vc->vc_y + 1 == vc->vc_bottom)
1000                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1001         else if (vc->vc_y < vc->vc_rows - 1) {
1002                 vc->vc_y++;
1003                 vc->vc_pos += vc->vc_size_row;
1004         }
1005         vc->vc_need_wrap = 0;
1006 }
1007
1008 static void ri(struct vc_data *vc)
1009 {
1010         /* don't scroll if below top of scrolling region, or
1011          * if above scrolling region
1012          */
1013         if (vc->vc_y == vc->vc_top)
1014                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1015         else if (vc->vc_y > 0) {
1016                 vc->vc_y--;
1017                 vc->vc_pos -= vc->vc_size_row;
1018         }
1019         vc->vc_need_wrap = 0;
1020 }
1021
1022 static inline void cr(struct vc_data *vc)
1023 {
1024         vc->vc_pos -= vc->vc_x << 1;
1025         vc->vc_need_wrap = vc->vc_x = 0;
1026 }
1027
1028 static inline void bs(struct vc_data *vc)
1029 {
1030         if (vc->vc_x) {
1031                 vc->vc_pos -= 2;
1032                 vc->vc_x--;
1033                 vc->vc_need_wrap = 0;
1034         }
1035 }
1036
1037 static inline void del(struct vc_data *vc)
1038 {
1039         /* ignored */
1040 }
1041
1042 static void csi_J(struct vc_data *vc, int vpar)
1043 {
1044         unsigned int count;
1045         unsigned short * start;
1046
1047         switch (vpar) {
1048                 case 0: /* erase from cursor to end of display */
1049                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1050                         start = (unsigned short *)vc->vc_pos;
1051                         if (DO_UPDATE(vc)) {
1052                                 /* do in two stages */
1053                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1054                                               vc->vc_cols - vc->vc_x);
1055                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1056                                               vc->vc_rows - vc->vc_y - 1,
1057                                               vc->vc_cols);
1058                         }
1059                         break;
1060                 case 1: /* erase from start to cursor */
1061                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1062                         start = (unsigned short *)vc->vc_origin;
1063                         if (DO_UPDATE(vc)) {
1064                                 /* do in two stages */
1065                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1066                                               vc->vc_cols);
1067                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1068                                               vc->vc_x + 1);
1069                         }
1070                         break;
1071                 case 2: /* erase whole display */
1072                         count = vc->vc_cols * vc->vc_rows;
1073                         start = (unsigned short *)vc->vc_origin;
1074                         if (DO_UPDATE(vc))
1075                                 vc->vc_sw->con_clear(vc, 0, 0,
1076                                               vc->vc_rows,
1077                                               vc->vc_cols);
1078                         break;
1079                 default:
1080                         return;
1081         }
1082         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1083         vc->vc_need_wrap = 0;
1084 }
1085
1086 static void csi_K(struct vc_data *vc, int vpar)
1087 {
1088         unsigned int count;
1089         unsigned short * start;
1090
1091         switch (vpar) {
1092                 case 0: /* erase from cursor to end of line */
1093                         count = vc->vc_cols - vc->vc_x;
1094                         start = (unsigned short *)vc->vc_pos;
1095                         if (DO_UPDATE(vc))
1096                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1097                                                      vc->vc_cols - vc->vc_x);
1098                         break;
1099                 case 1: /* erase from start of line to cursor */
1100                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1101                         count = vc->vc_x + 1;
1102                         if (DO_UPDATE(vc))
1103                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1104                                                      vc->vc_x + 1);
1105                         break;
1106                 case 2: /* erase whole line */
1107                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1108                         count = vc->vc_cols;
1109                         if (DO_UPDATE(vc))
1110                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1111                                               vc->vc_cols);
1112                         break;
1113                 default:
1114                         return;
1115         }
1116         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1117         vc->vc_need_wrap = 0;
1118 }
1119
1120 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1121 {                                         /* not vt100? */
1122         int count;
1123
1124         if (!vpar)
1125                 vpar++;
1126         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1127
1128         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1129         if (DO_UPDATE(vc))
1130                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1131         vc->vc_need_wrap = 0;
1132 }
1133
1134 static void default_attr(struct vc_data *vc)
1135 {
1136         vc->vc_intensity = 1;
1137         vc->vc_underline = 0;
1138         vc->vc_reverse = 0;
1139         vc->vc_blink = 0;
1140         vc->vc_color = vc->vc_def_color;
1141 }
1142
1143 /* console_sem is held */
1144 static void csi_m(struct vc_data *vc)
1145 {
1146         int i;
1147
1148         for (i = 0; i <= vc->vc_npar; i++)
1149                 switch (vc->vc_par[i]) {
1150                         case 0: /* all attributes off */
1151                                 default_attr(vc);
1152                                 break;
1153                         case 1:
1154                                 vc->vc_intensity = 2;
1155                                 break;
1156                         case 2:
1157                                 vc->vc_intensity = 0;
1158                                 break;
1159                         case 4:
1160                                 vc->vc_underline = 1;
1161                                 break;
1162                         case 5:
1163                                 vc->vc_blink = 1;
1164                                 break;
1165                         case 7:
1166                                 vc->vc_reverse = 1;
1167                                 break;
1168                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1169                                   * Select primary font, don't display
1170                                   * control chars if defined, don't set
1171                                   * bit 8 on output.
1172                                   */
1173                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1174                                                 ? vc->vc_G0_charset
1175                                                 : vc->vc_G1_charset, vc);
1176                                 vc->vc_disp_ctrl = 0;
1177                                 vc->vc_toggle_meta = 0;
1178                                 break;
1179                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1180                                   * Select first alternate font, lets
1181                                   * chars < 32 be displayed as ROM chars.
1182                                   */
1183                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1184                                 vc->vc_disp_ctrl = 1;
1185                                 vc->vc_toggle_meta = 0;
1186                                 break;
1187                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1188                                   * Select second alternate font, toggle
1189                                   * high bit before displaying as ROM char.
1190                                   */
1191                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1192                                 vc->vc_disp_ctrl = 1;
1193                                 vc->vc_toggle_meta = 1;
1194                                 break;
1195                         case 21:
1196                         case 22:
1197                                 vc->vc_intensity = 1;
1198                                 break;
1199                         case 24:
1200                                 vc->vc_underline = 0;
1201                                 break;
1202                         case 25:
1203                                 vc->vc_blink = 0;
1204                                 break;
1205                         case 27:
1206                                 vc->vc_reverse = 0;
1207                                 break;
1208                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1209                                   * Enables underscore, white foreground
1210                                   * with white underscore (Linux - use
1211                                   * default foreground).
1212                                   */
1213                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1214                                 vc->vc_underline = 1;
1215                                 break;
1216                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1217                                   * Disable underline option.
1218                                   * Reset colour to default? It did this
1219                                   * before...
1220                                   */
1221                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1222                                 vc->vc_underline = 0;
1223                                 break;
1224                         case 49:
1225                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1226                                 break;
1227                         default:
1228                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1229                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1230                                                 | (vc->vc_color & 0xf0);
1231                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1232                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1233                                                 | (vc->vc_color & 0x0f);
1234                                 break;
1235                 }
1236         update_attr(vc);
1237 }
1238
1239 static void respond_string(const char *p, struct tty_struct *tty)
1240 {
1241         while (*p) {
1242                 tty_insert_flip_char(tty, *p, 0);
1243                 p++;
1244         }
1245         con_schedule_flip(tty);
1246 }
1247
1248 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1249 {
1250         char buf[40];
1251
1252         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1253         respond_string(buf, tty);
1254 }
1255
1256 static inline void status_report(struct tty_struct *tty)
1257 {
1258         respond_string("\033[0n", tty); /* Terminal ok */
1259 }
1260
1261 static inline void respond_ID(struct tty_struct * tty)
1262 {
1263         respond_string(VT102ID, tty);
1264 }
1265
1266 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1267 {
1268         char buf[8];
1269
1270         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1271                 (char)('!' + mry));
1272         respond_string(buf, tty);
1273 }
1274
1275 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1276 int mouse_reporting(void)
1277 {
1278         return vc_cons[fg_console].d->vc_report_mouse;
1279 }
1280
1281 /* console_sem is held */
1282 static void set_mode(struct vc_data *vc, int on_off)
1283 {
1284         int i;
1285
1286         for (i = 0; i <= vc->vc_npar; i++)
1287                 if (vc->vc_ques) {
1288                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1289                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1290                                 if (on_off)
1291                                         set_kbd(vc, decckm);
1292                                 else
1293                                         clr_kbd(vc, decckm);
1294                                 break;
1295                         case 3: /* 80/132 mode switch unimplemented */
1296                                 vc->vc_deccolm = on_off;
1297 #if 0
1298                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1299                                 /* this alone does not suffice; some user mode
1300                                    utility has to change the hardware regs */
1301 #endif
1302                                 break;
1303                         case 5:                 /* Inverted screen on/off */
1304                                 if (vc->vc_decscnm != on_off) {
1305                                         vc->vc_decscnm = on_off;
1306                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1307                                         update_attr(vc);
1308                                 }
1309                                 break;
1310                         case 6:                 /* Origin relative/absolute */
1311                                 vc->vc_decom = on_off;
1312                                 gotoxay(vc, 0, 0);
1313                                 break;
1314                         case 7:                 /* Autowrap on/off */
1315                                 vc->vc_decawm = on_off;
1316                                 break;
1317                         case 8:                 /* Autorepeat on/off */
1318                                 if (on_off)
1319                                         set_kbd(vc, decarm);
1320                                 else
1321                                         clr_kbd(vc, decarm);
1322                                 break;
1323                         case 9:
1324                                 vc->vc_report_mouse = on_off ? 1 : 0;
1325                                 break;
1326                         case 25:                /* Cursor on/off */
1327                                 vc->vc_deccm = on_off;
1328                                 break;
1329                         case 1000:
1330                                 vc->vc_report_mouse = on_off ? 2 : 0;
1331                                 break;
1332                         }
1333                 } else {
1334                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1335                         case 3:                 /* Monitor (display ctrls) */
1336                                 vc->vc_disp_ctrl = on_off;
1337                                 break;
1338                         case 4:                 /* Insert Mode on/off */
1339                                 vc->vc_decim = on_off;
1340                                 break;
1341                         case 20:                /* Lf, Enter == CrLf/Lf */
1342                                 if (on_off)
1343                                         set_kbd(vc, lnm);
1344                                 else
1345                                         clr_kbd(vc, lnm);
1346                                 break;
1347                         }
1348                 }
1349 }
1350
1351 /* console_sem is held */
1352 static void setterm_command(struct vc_data *vc)
1353 {
1354         switch(vc->vc_par[0]) {
1355                 case 1: /* set color for underline mode */
1356                         if (vc->vc_can_do_color &&
1357                                         vc->vc_par[1] < 16) {
1358                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1359                                 if (vc->vc_underline)
1360                                         update_attr(vc);
1361                         }
1362                         break;
1363                 case 2: /* set color for half intensity mode */
1364                         if (vc->vc_can_do_color &&
1365                                         vc->vc_par[1] < 16) {
1366                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1367                                 if (vc->vc_intensity == 0)
1368                                         update_attr(vc);
1369                         }
1370                         break;
1371                 case 8: /* store colors as defaults */
1372                         vc->vc_def_color = vc->vc_attr;
1373                         if (vc->vc_hi_font_mask == 0x100)
1374                                 vc->vc_def_color >>= 1;
1375                         default_attr(vc);
1376                         update_attr(vc);
1377                         break;
1378                 case 9: /* set blanking interval */
1379                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1380                         poke_blanked_console();
1381                         break;
1382                 case 10: /* set bell frequency in Hz */
1383                         if (vc->vc_npar >= 1)
1384                                 vc->vc_bell_pitch = vc->vc_par[1];
1385                         else
1386                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1387                         break;
1388                 case 11: /* set bell duration in msec */
1389                         if (vc->vc_npar >= 1)
1390                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1391                                         vc->vc_par[1] * HZ / 1000 : 0;
1392                         else
1393                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1394                         break;
1395                 case 12: /* bring specified console to the front */
1396                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1397                                 set_console(vc->vc_par[1] - 1);
1398                         break;
1399                 case 13: /* unblank the screen */
1400                         poke_blanked_console();
1401                         break;
1402                 case 14: /* set vesa powerdown interval */
1403                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1404                         break;
1405                 case 15: /* activate the previous console */
1406                         set_console(last_console);
1407                         break;
1408         }
1409 }
1410
1411 /* console_sem is held */
1412 static void csi_at(struct vc_data *vc, unsigned int nr)
1413 {
1414         if (nr > vc->vc_cols - vc->vc_x)
1415                 nr = vc->vc_cols - vc->vc_x;
1416         else if (!nr)
1417                 nr = 1;
1418         insert_char(vc, nr);
1419 }
1420
1421 /* console_sem is held */
1422 static void csi_L(struct vc_data *vc, unsigned int nr)
1423 {
1424         if (nr > vc->vc_rows - vc->vc_y)
1425                 nr = vc->vc_rows - vc->vc_y;
1426         else if (!nr)
1427                 nr = 1;
1428         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1429         vc->vc_need_wrap = 0;
1430 }
1431
1432 /* console_sem is held */
1433 static void csi_P(struct vc_data *vc, unsigned int nr)
1434 {
1435         if (nr > vc->vc_cols - vc->vc_x)
1436                 nr = vc->vc_cols - vc->vc_x;
1437         else if (!nr)
1438                 nr = 1;
1439         delete_char(vc, nr);
1440 }
1441
1442 /* console_sem is held */
1443 static void csi_M(struct vc_data *vc, unsigned int nr)
1444 {
1445         if (nr > vc->vc_rows - vc->vc_y)
1446                 nr = vc->vc_rows - vc->vc_y;
1447         else if (!nr)
1448                 nr=1;
1449         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1450         vc->vc_need_wrap = 0;
1451 }
1452
1453 /* console_sem is held (except via vc_init->reset_terminal */
1454 static void save_cur(struct vc_data *vc)
1455 {
1456         vc->vc_saved_x          = vc->vc_x;
1457         vc->vc_saved_y          = vc->vc_y;
1458         vc->vc_s_intensity      = vc->vc_intensity;
1459         vc->vc_s_underline      = vc->vc_underline;
1460         vc->vc_s_blink          = vc->vc_blink;
1461         vc->vc_s_reverse        = vc->vc_reverse;
1462         vc->vc_s_charset        = vc->vc_charset;
1463         vc->vc_s_color          = vc->vc_color;
1464         vc->vc_saved_G0         = vc->vc_G0_charset;
1465         vc->vc_saved_G1         = vc->vc_G1_charset;
1466 }
1467
1468 /* console_sem is held */
1469 static void restore_cur(struct vc_data *vc)
1470 {
1471         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1472         vc->vc_intensity        = vc->vc_s_intensity;
1473         vc->vc_underline        = vc->vc_s_underline;
1474         vc->vc_blink            = vc->vc_s_blink;
1475         vc->vc_reverse          = vc->vc_s_reverse;
1476         vc->vc_charset          = vc->vc_s_charset;
1477         vc->vc_color            = vc->vc_s_color;
1478         vc->vc_G0_charset       = vc->vc_saved_G0;
1479         vc->vc_G1_charset       = vc->vc_saved_G1;
1480         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1481         update_attr(vc);
1482         vc->vc_need_wrap = 0;
1483 }
1484
1485 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1486         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1487         ESpalette };
1488
1489 /* console_sem is held (except via vc_init()) */
1490 static void reset_terminal(struct vc_data *vc, int do_clear)
1491 {
1492         vc->vc_top              = 0;
1493         vc->vc_bottom           = vc->vc_rows;
1494         vc->vc_state            = ESnormal;
1495         vc->vc_ques             = 0;
1496         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1497         vc->vc_G0_charset       = LAT1_MAP;
1498         vc->vc_G1_charset       = GRAF_MAP;
1499         vc->vc_charset          = 0;
1500         vc->vc_need_wrap        = 0;
1501         vc->vc_report_mouse     = 0;
1502         vc->vc_utf              = 0;
1503         vc->vc_utf_count        = 0;
1504
1505         vc->vc_disp_ctrl        = 0;
1506         vc->vc_toggle_meta      = 0;
1507
1508         vc->vc_decscnm          = 0;
1509         vc->vc_decom            = 0;
1510         vc->vc_decawm           = 1;
1511         vc->vc_deccm            = 1;
1512         vc->vc_decim            = 0;
1513
1514         set_kbd(vc, decarm);
1515         clr_kbd(vc, decckm);
1516         clr_kbd(vc, kbdapplic);
1517         clr_kbd(vc, lnm);
1518         kbd_table[vc->vc_num].lockstate = 0;
1519         kbd_table[vc->vc_num].slockstate = 0;
1520         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1521         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1522         /* do not do set_leds here because this causes an endless tasklet loop
1523            when the keyboard hasn't been initialized yet */
1524
1525         vc->vc_cursor_type = CUR_DEFAULT;
1526         vc->vc_complement_mask = vc->vc_s_complement_mask;
1527
1528         default_attr(vc);
1529         update_attr(vc);
1530
1531         vc->vc_tab_stop[0]      = 0x01010100;
1532         vc->vc_tab_stop[1]      =
1533         vc->vc_tab_stop[2]      =
1534         vc->vc_tab_stop[3]      =
1535         vc->vc_tab_stop[4]      = 0x01010101;
1536
1537         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1538         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1539
1540         gotoxy(vc, 0, 0);
1541         save_cur(vc);
1542         if (do_clear)
1543             csi_J(vc, 2);
1544 }
1545
1546 /* console_sem is held */
1547 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1548 {
1549         /*
1550          *  Control characters can be used in the _middle_
1551          *  of an escape sequence.
1552          */
1553         switch (c) {
1554         case 0:
1555                 return;
1556         case 7:
1557                 if (vc->vc_bell_duration)
1558                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1559                 return;
1560         case 8:
1561                 bs(vc);
1562                 return;
1563         case 9:
1564                 vc->vc_pos -= (vc->vc_x << 1);
1565                 while (vc->vc_x < vc->vc_cols - 1) {
1566                         vc->vc_x++;
1567                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1568                                 break;
1569                 }
1570                 vc->vc_pos += (vc->vc_x << 1);
1571                 return;
1572         case 10: case 11: case 12:
1573                 lf(vc);
1574                 if (!is_kbd(vc, lnm))
1575                         return;
1576         case 13:
1577                 cr(vc);
1578                 return;
1579         case 14:
1580                 vc->vc_charset = 1;
1581                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1582                 vc->vc_disp_ctrl = 1;
1583                 return;
1584         case 15:
1585                 vc->vc_charset = 0;
1586                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1587                 vc->vc_disp_ctrl = 0;
1588                 return;
1589         case 24: case 26:
1590                 vc->vc_state = ESnormal;
1591                 return;
1592         case 27:
1593                 vc->vc_state = ESesc;
1594                 return;
1595         case 127:
1596                 del(vc);
1597                 return;
1598         case 128+27:
1599                 vc->vc_state = ESsquare;
1600                 return;
1601         }
1602         switch(vc->vc_state) {
1603         case ESesc:
1604                 vc->vc_state = ESnormal;
1605                 switch (c) {
1606                 case '[':
1607                         vc->vc_state = ESsquare;
1608                         return;
1609                 case ']':
1610                         vc->vc_state = ESnonstd;
1611                         return;
1612                 case '%':
1613                         vc->vc_state = ESpercent;
1614                         return;
1615                 case 'E':
1616                         cr(vc);
1617                         lf(vc);
1618                         return;
1619                 case 'M':
1620                         ri(vc);
1621                         return;
1622                 case 'D':
1623                         lf(vc);
1624                         return;
1625                 case 'H':
1626                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1627                         return;
1628                 case 'Z':
1629                         respond_ID(tty);
1630                         return;
1631                 case '7':
1632                         save_cur(vc);
1633                         return;
1634                 case '8':
1635                         restore_cur(vc);
1636                         return;
1637                 case '(':
1638                         vc->vc_state = ESsetG0;
1639                         return;
1640                 case ')':
1641                         vc->vc_state = ESsetG1;
1642                         return;
1643                 case '#':
1644                         vc->vc_state = EShash;
1645                         return;
1646                 case 'c':
1647                         reset_terminal(vc, 1);
1648                         return;
1649                 case '>':  /* Numeric keypad */
1650                         clr_kbd(vc, kbdapplic);
1651                         return;
1652                 case '=':  /* Appl. keypad */
1653                         set_kbd(vc, kbdapplic);
1654                         return;
1655                 }
1656                 return;
1657         case ESnonstd:
1658                 if (c=='P') {   /* palette escape sequence */
1659                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1660                                 vc->vc_par[vc->vc_npar] = 0;
1661                         vc->vc_npar = 0;
1662                         vc->vc_state = ESpalette;
1663                         return;
1664                 } else if (c=='R') {   /* reset palette */
1665                         reset_palette(vc);
1666                         vc->vc_state = ESnormal;
1667                 } else
1668                         vc->vc_state = ESnormal;
1669                 return;
1670         case ESpalette:
1671                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1672                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1673                         if (vc->vc_npar == 7) {
1674                                 int i = vc->vc_par[0] * 3, j = 1;
1675                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1676                                 vc->vc_palette[i++] += vc->vc_par[j++];
1677                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1678                                 vc->vc_palette[i++] += vc->vc_par[j++];
1679                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1680                                 vc->vc_palette[i] += vc->vc_par[j];
1681                                 set_palette(vc);
1682                                 vc->vc_state = ESnormal;
1683                         }
1684                 } else
1685                         vc->vc_state = ESnormal;
1686                 return;
1687         case ESsquare:
1688                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1689                         vc->vc_par[vc->vc_npar] = 0;
1690                 vc->vc_npar = 0;
1691                 vc->vc_state = ESgetpars;
1692                 if (c == '[') { /* Function key */
1693                         vc->vc_state=ESfunckey;
1694                         return;
1695                 }
1696                 vc->vc_ques = (c == '?');
1697                 if (vc->vc_ques)
1698                         return;
1699         case ESgetpars:
1700                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1701                         vc->vc_npar++;
1702                         return;
1703                 } else if (c>='0' && c<='9') {
1704                         vc->vc_par[vc->vc_npar] *= 10;
1705                         vc->vc_par[vc->vc_npar] += c - '0';
1706                         return;
1707                 } else
1708                         vc->vc_state = ESgotpars;
1709         case ESgotpars:
1710                 vc->vc_state = ESnormal;
1711                 switch(c) {
1712                 case 'h':
1713                         set_mode(vc, 1);
1714                         return;
1715                 case 'l':
1716                         set_mode(vc, 0);
1717                         return;
1718                 case 'c':
1719                         if (vc->vc_ques) {
1720                                 if (vc->vc_par[0])
1721                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1722                                 else
1723                                         vc->vc_cursor_type = CUR_DEFAULT;
1724                                 return;
1725                         }
1726                         break;
1727                 case 'm':
1728                         if (vc->vc_ques) {
1729                                 clear_selection();
1730                                 if (vc->vc_par[0])
1731                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1732                                 else
1733                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1734                                 return;
1735                         }
1736                         break;
1737                 case 'n':
1738                         if (!vc->vc_ques) {
1739                                 if (vc->vc_par[0] == 5)
1740                                         status_report(tty);
1741                                 else if (vc->vc_par[0] == 6)
1742                                         cursor_report(vc, tty);
1743                         }
1744                         return;
1745                 }
1746                 if (vc->vc_ques) {
1747                         vc->vc_ques = 0;
1748                         return;
1749                 }
1750                 switch(c) {
1751                 case 'G': case '`':
1752                         if (vc->vc_par[0])
1753                                 vc->vc_par[0]--;
1754                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1755                         return;
1756                 case 'A':
1757                         if (!vc->vc_par[0])
1758                                 vc->vc_par[0]++;
1759                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1760                         return;
1761                 case 'B': case 'e':
1762                         if (!vc->vc_par[0])
1763                                 vc->vc_par[0]++;
1764                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1765                         return;
1766                 case 'C': case 'a':
1767                         if (!vc->vc_par[0])
1768                                 vc->vc_par[0]++;
1769                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1770                         return;
1771                 case 'D':
1772                         if (!vc->vc_par[0])
1773                                 vc->vc_par[0]++;
1774                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1775                         return;
1776                 case 'E':
1777                         if (!vc->vc_par[0])
1778                                 vc->vc_par[0]++;
1779                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1780                         return;
1781                 case 'F':
1782                         if (!vc->vc_par[0])
1783                                 vc->vc_par[0]++;
1784                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1785                         return;
1786                 case 'd':
1787                         if (vc->vc_par[0])
1788                                 vc->vc_par[0]--;
1789                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1790                         return;
1791                 case 'H': case 'f':
1792                         if (vc->vc_par[0])
1793                                 vc->vc_par[0]--;
1794                         if (vc->vc_par[1])
1795                                 vc->vc_par[1]--;
1796                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1797                         return;
1798                 case 'J':
1799                         csi_J(vc, vc->vc_par[0]);
1800                         return;
1801                 case 'K':
1802                         csi_K(vc, vc->vc_par[0]);
1803                         return;
1804                 case 'L':
1805                         csi_L(vc, vc->vc_par[0]);
1806                         return;
1807                 case 'M':
1808                         csi_M(vc, vc->vc_par[0]);
1809                         return;
1810                 case 'P':
1811                         csi_P(vc, vc->vc_par[0]);
1812                         return;
1813                 case 'c':
1814                         if (!vc->vc_par[0])
1815                                 respond_ID(tty);
1816                         return;
1817                 case 'g':
1818                         if (!vc->vc_par[0])
1819                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1820                         else if (vc->vc_par[0] == 3) {
1821                                 vc->vc_tab_stop[0] =
1822                                         vc->vc_tab_stop[1] =
1823                                         vc->vc_tab_stop[2] =
1824                                         vc->vc_tab_stop[3] =
1825                                         vc->vc_tab_stop[4] = 0;
1826                         }
1827                         return;
1828                 case 'm':
1829                         csi_m(vc);
1830                         return;
1831                 case 'q': /* DECLL - but only 3 leds */
1832                         /* map 0,1,2,3 to 0,1,2,4 */
1833                         if (vc->vc_par[0] < 4)
1834                                 setledstate(kbd_table + vc->vc_num,
1835                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1836                         return;
1837                 case 'r':
1838                         if (!vc->vc_par[0])
1839                                 vc->vc_par[0]++;
1840                         if (!vc->vc_par[1])
1841                                 vc->vc_par[1] = vc->vc_rows;
1842                         /* Minimum allowed region is 2 lines */
1843                         if (vc->vc_par[0] < vc->vc_par[1] &&
1844                             vc->vc_par[1] <= vc->vc_rows) {
1845                                 vc->vc_top = vc->vc_par[0] - 1;
1846                                 vc->vc_bottom = vc->vc_par[1];
1847                                 gotoxay(vc, 0, 0);
1848                         }
1849                         return;
1850                 case 's':
1851                         save_cur(vc);
1852                         return;
1853                 case 'u':
1854                         restore_cur(vc);
1855                         return;
1856                 case 'X':
1857                         csi_X(vc, vc->vc_par[0]);
1858                         return;
1859                 case '@':
1860                         csi_at(vc, vc->vc_par[0]);
1861                         return;
1862                 case ']': /* setterm functions */
1863                         setterm_command(vc);
1864                         return;
1865                 }
1866                 return;
1867         case ESpercent:
1868                 vc->vc_state = ESnormal;
1869                 switch (c) {
1870                 case '@':  /* defined in ISO 2022 */
1871                         vc->vc_utf = 0;
1872                         return;
1873                 case 'G':  /* prelim official escape code */
1874                 case '8':  /* retained for compatibility */
1875                         vc->vc_utf = 1;
1876                         return;
1877                 }
1878                 return;
1879         case ESfunckey:
1880                 vc->vc_state = ESnormal;
1881                 return;
1882         case EShash:
1883                 vc->vc_state = ESnormal;
1884                 if (c == '8') {
1885                         /* DEC screen alignment test. kludge :-) */
1886                         vc->vc_video_erase_char =
1887                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1888                         csi_J(vc, 2);
1889                         vc->vc_video_erase_char =
1890                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1891                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1892                 }
1893                 return;
1894         case ESsetG0:
1895                 if (c == '0')
1896                         vc->vc_G0_charset = GRAF_MAP;
1897                 else if (c == 'B')
1898                         vc->vc_G0_charset = LAT1_MAP;
1899                 else if (c == 'U')
1900                         vc->vc_G0_charset = IBMPC_MAP;
1901                 else if (c == 'K')
1902                         vc->vc_G0_charset = USER_MAP;
1903                 if (vc->vc_charset == 0)
1904                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1905                 vc->vc_state = ESnormal;
1906                 return;
1907         case ESsetG1:
1908                 if (c == '0')
1909                         vc->vc_G1_charset = GRAF_MAP;
1910                 else if (c == 'B')
1911                         vc->vc_G1_charset = LAT1_MAP;
1912                 else if (c == 'U')
1913                         vc->vc_G1_charset = IBMPC_MAP;
1914                 else if (c == 'K')
1915                         vc->vc_G1_charset = USER_MAP;
1916                 if (vc->vc_charset == 1)
1917                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1918                 vc->vc_state = ESnormal;
1919                 return;
1920         default:
1921                 vc->vc_state = ESnormal;
1922         }
1923 }
1924
1925 /* This is a temporary buffer used to prepare a tty console write
1926  * so that we can easily avoid touching user space while holding the
1927  * console spinlock.  It is allocated in con_init and is shared by
1928  * this code and the vc_screen read/write tty calls.
1929  *
1930  * We have to allocate this statically in the kernel data section
1931  * since console_init (and thus con_init) are called before any
1932  * kernel memory allocation is available.
1933  */
1934 char con_buf[CON_BUF_SIZE];
1935 DECLARE_MUTEX(con_buf_sem);
1936
1937 /* acquires console_sem */
1938 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1939 {
1940 #ifdef VT_BUF_VRAM_ONLY
1941 #define FLUSH do { } while(0);
1942 #else
1943 #define FLUSH if (draw_x >= 0) { \
1944         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1945         draw_x = -1; \
1946         }
1947 #endif
1948
1949         int c, tc, ok, n = 0, draw_x = -1;
1950         unsigned int currcons;
1951         unsigned long draw_from = 0, draw_to = 0;
1952         struct vc_data *vc;
1953         u16 himask, charmask;
1954         const unsigned char *orig_buf = NULL;
1955         int orig_count;
1956
1957         if (in_interrupt())
1958                 return count;
1959
1960         might_sleep();
1961
1962         acquire_console_sem();
1963         vc = tty->driver_data;
1964         if (vc == NULL) {
1965                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1966                 release_console_sem();
1967                 return 0;
1968         }
1969
1970         currcons = vc->vc_num;
1971         if (!vc_cons_allocated(currcons)) {
1972             /* could this happen? */
1973             static int error = 0;
1974             if (!error) {
1975                 error = 1;
1976                 printk("con_write: tty %d not allocated\n", currcons+1);
1977             }
1978             release_console_sem();
1979             return 0;
1980         }
1981         release_console_sem();
1982
1983         orig_buf = buf;
1984         orig_count = count;
1985
1986         /* At this point 'buf' is guaranteed to be a kernel buffer
1987          * and therefore no access to userspace (and therefore sleeping)
1988          * will be needed.  The con_buf_sem serializes all tty based
1989          * console rendering and vcs write/read operations.  We hold
1990          * the console spinlock during the entire write.
1991          */
1992
1993         acquire_console_sem();
1994
1995         vc = tty->driver_data;
1996         if (vc == NULL) {
1997                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
1998                 release_console_sem();
1999                 goto out;
2000         }
2001
2002         himask = vc->vc_hi_font_mask;
2003         charmask = himask ? 0x1ff : 0xff;
2004
2005         /* undraw cursor first */
2006         if (IS_FG(vc))
2007                 hide_cursor(vc);
2008
2009         while (!tty->stopped && count) {
2010                 int orig = *buf;
2011                 c = orig;
2012                 buf++;
2013                 n++;
2014                 count--;
2015
2016                 /* Do no translation at all in control states */
2017                 if (vc->vc_state != ESnormal) {
2018                         tc = c;
2019                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2020                     /* Combine UTF-8 into Unicode */
2021                     /* Malformed sequences as sequences of replacement glyphs */
2022 rescan_last_byte:
2023                     if(c > 0x7f) {
2024                         if (vc->vc_utf_count) {
2025                                if ((c & 0xc0) == 0x80) {
2026                                        vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2027                                        if (--vc->vc_utf_count) {
2028                                                vc->vc_npar++;
2029                                                continue;
2030                                        }
2031                                        tc = c = vc->vc_utf_char;
2032                                } else
2033                                        goto replacement_glyph;
2034                         } else {
2035                                 vc->vc_npar = 0;
2036                                 if ((c & 0xe0) == 0xc0) {
2037                                     vc->vc_utf_count = 1;
2038                                     vc->vc_utf_char = (c & 0x1f);
2039                                 } else if ((c & 0xf0) == 0xe0) {
2040                                     vc->vc_utf_count = 2;
2041                                     vc->vc_utf_char = (c & 0x0f);
2042                                 } else if ((c & 0xf8) == 0xf0) {
2043                                     vc->vc_utf_count = 3;
2044                                     vc->vc_utf_char = (c & 0x07);
2045                                 } else if ((c & 0xfc) == 0xf8) {
2046                                     vc->vc_utf_count = 4;
2047                                     vc->vc_utf_char = (c & 0x03);
2048                                 } else if ((c & 0xfe) == 0xfc) {
2049                                     vc->vc_utf_count = 5;
2050                                     vc->vc_utf_char = (c & 0x01);
2051                                 } else
2052                                     goto replacement_glyph;
2053                                 continue;
2054                               }
2055                     } else {
2056                       if (vc->vc_utf_count)
2057                               goto replacement_glyph;
2058                       tc = c;
2059                     }
2060                 } else {        /* no utf or alternate charset mode */
2061                   tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2062                 }
2063
2064                 /* If the original code was a control character we
2065                  * only allow a glyph to be displayed if the code is
2066                  * not normally used (such as for cursor movement) or
2067                  * if the disp_ctrl mode has been explicitly enabled.
2068                  * Certain characters (as given by the CTRL_ALWAYS
2069                  * bitmap) are always displayed as control characters,
2070                  * as the console would be pretty useless without
2071                  * them; to display an arbitrary font position use the
2072                  * direct-to-font zone in UTF-8 mode.
2073                  */
2074                 ok = tc && (c >= 32 ||
2075                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2076                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2077                         && (c != 127 || vc->vc_disp_ctrl)
2078                         && (c != 128+27);
2079
2080                 if (vc->vc_state == ESnormal && ok) {
2081                         /* Now try to find out how to display it */
2082                         tc = conv_uni_to_pc(vc, tc);
2083                         if (tc & ~charmask) {
2084                                 if ( tc == -4 ) {
2085                                 /* If we got -4 (not found) then see if we have
2086                                    defined a replacement character (U+FFFD) */
2087 replacement_glyph:
2088                                         tc = conv_uni_to_pc(vc, 0xfffd);
2089                                         if (!(tc & ~charmask))
2090                                                 goto display_glyph;
2091                                 } else if ( tc != -3 )
2092                                         continue; /* nothing to display */
2093                                 /* no hash table or no replacement --
2094                                  * hope for the best */
2095                                 if ( c & ~charmask )
2096                                         tc = '?';
2097                                 else
2098                                         tc = c;
2099                         }
2100
2101 display_glyph:
2102                         if (vc->vc_need_wrap || vc->vc_decim)
2103                                 FLUSH
2104                         if (vc->vc_need_wrap) {
2105                                 cr(vc);
2106                                 lf(vc);
2107                         }
2108                         if (vc->vc_decim)
2109                                 insert_char(vc, 1);
2110                         scr_writew(himask ?
2111                                      ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2112                                      (vc->vc_attr << 8) + tc,
2113                                    (u16 *) vc->vc_pos);
2114                         if (DO_UPDATE(vc) && draw_x < 0) {
2115                                 draw_x = vc->vc_x;
2116                                 draw_from = vc->vc_pos;
2117                         }
2118                         if (vc->vc_x == vc->vc_cols - 1) {
2119                                 vc->vc_need_wrap = vc->vc_decawm;
2120                                 draw_to = vc->vc_pos + 2;
2121                         } else {
2122                                 vc->vc_x++;
2123                                 draw_to = (vc->vc_pos += 2);
2124                         }
2125                         if (vc->vc_utf_count) {
2126                                 if (vc->vc_npar) {
2127                                         vc->vc_npar--;
2128                                         goto display_glyph;
2129                                 }
2130                                 vc->vc_utf_count = 0;
2131                                 c = orig;
2132                                 goto rescan_last_byte;
2133                         }
2134                         continue;
2135                 }
2136                 FLUSH
2137                 do_con_trol(tty, vc, orig);
2138         }
2139         FLUSH
2140         console_conditional_schedule();
2141         release_console_sem();
2142
2143 out:
2144         return n;
2145 #undef FLUSH
2146 }
2147
2148 /*
2149  * This is the console switching callback.
2150  *
2151  * Doing console switching in a process context allows
2152  * us to do the switches asynchronously (needed when we want
2153  * to switch due to a keyboard interrupt).  Synchronization
2154  * with other console code and prevention of re-entrancy is
2155  * ensured with console_sem.
2156  */
2157 static void console_callback(struct work_struct *ignored)
2158 {
2159         acquire_console_sem();
2160
2161         if (want_console >= 0) {
2162                 if (want_console != fg_console &&
2163                     vc_cons_allocated(want_console)) {
2164                         hide_cursor(vc_cons[fg_console].d);
2165                         change_console(vc_cons[want_console].d);
2166                         /* we only changed when the console had already
2167                            been allocated - a new console is not created
2168                            in an interrupt routine */
2169                 }
2170                 want_console = -1;
2171         }
2172         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2173                 do_poke_blanked_console = 0;
2174                 poke_blanked_console();
2175         }
2176         if (scrollback_delta) {
2177                 struct vc_data *vc = vc_cons[fg_console].d;
2178                 clear_selection();
2179                 if (vc->vc_mode == KD_TEXT)
2180                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2181                 scrollback_delta = 0;
2182         }
2183         if (blank_timer_expired) {
2184                 do_blank_screen(0);
2185                 blank_timer_expired = 0;
2186         }
2187
2188         release_console_sem();
2189 }
2190
2191 void set_console(int nr)
2192 {
2193         want_console = nr;
2194         schedule_console_callback();
2195 }
2196
2197 struct tty_driver *console_driver;
2198
2199 #ifdef CONFIG_VT_CONSOLE
2200
2201 /*
2202  *      Console on virtual terminal
2203  *
2204  * The console must be locked when we get here.
2205  */
2206
2207 static void vt_console_print(struct console *co, const char *b, unsigned count)
2208 {
2209         struct vc_data *vc = vc_cons[fg_console].d;
2210         unsigned char c;
2211         static unsigned long printing;
2212         const ushort *start;
2213         ushort cnt = 0;
2214         ushort myx;
2215
2216         /* console busy or not yet initialized */
2217         if (!printable || test_and_set_bit(0, &printing))
2218                 return;
2219
2220         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2221                 vc = vc_cons[kmsg_redirect - 1].d;
2222
2223         /* read `x' only after setting currcons properly (otherwise
2224            the `x' macro will read the x of the foreground console). */
2225         myx = vc->vc_x;
2226
2227         if (!vc_cons_allocated(fg_console)) {
2228                 /* impossible */
2229                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2230                 goto quit;
2231         }
2232
2233         if (vc->vc_mode != KD_TEXT)
2234                 goto quit;
2235
2236         /* undraw cursor first */
2237         if (IS_FG(vc))
2238                 hide_cursor(vc);
2239
2240         start = (ushort *)vc->vc_pos;
2241
2242         /* Contrived structure to try to emulate original need_wrap behaviour
2243          * Problems caused when we have need_wrap set on '\n' character */
2244         while (count--) {
2245                 c = *b++;
2246                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2247                         if (cnt > 0) {
2248                                 if (CON_IS_VISIBLE(vc))
2249                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2250                                 vc->vc_x += cnt;
2251                                 if (vc->vc_need_wrap)
2252                                         vc->vc_x--;
2253                                 cnt = 0;
2254                         }
2255                         if (c == 8) {           /* backspace */
2256                                 bs(vc);
2257                                 start = (ushort *)vc->vc_pos;
2258                                 myx = vc->vc_x;
2259                                 continue;
2260                         }
2261                         if (c != 13)
2262                                 lf(vc);
2263                         cr(vc);
2264                         start = (ushort *)vc->vc_pos;
2265                         myx = vc->vc_x;
2266                         if (c == 10 || c == 13)
2267                                 continue;
2268                 }
2269                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2270                 cnt++;
2271                 if (myx == vc->vc_cols - 1) {
2272                         vc->vc_need_wrap = 1;
2273                         continue;
2274                 }
2275                 vc->vc_pos += 2;
2276                 myx++;
2277         }
2278         if (cnt > 0) {
2279                 if (CON_IS_VISIBLE(vc))
2280                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2281                 vc->vc_x += cnt;
2282                 if (vc->vc_x == vc->vc_cols) {
2283                         vc->vc_x--;
2284                         vc->vc_need_wrap = 1;
2285                 }
2286         }
2287         set_cursor(vc);
2288
2289 quit:
2290         clear_bit(0, &printing);
2291 }
2292
2293 static struct tty_driver *vt_console_device(struct console *c, int *index)
2294 {
2295         *index = c->index ? c->index-1 : fg_console;
2296         return console_driver;
2297 }
2298
2299 static struct console vt_console_driver = {
2300         .name           = "tty",
2301         .write          = vt_console_print,
2302         .device         = vt_console_device,
2303         .unblank        = unblank_screen,
2304         .flags          = CON_PRINTBUFFER,
2305         .index          = -1,
2306 };
2307 #endif
2308
2309 /*
2310  *      Handling of Linux-specific VC ioctls
2311  */
2312
2313 /*
2314  * Generally a bit racy with respect to console_sem().
2315  *
2316  * There are some functions which don't need it.
2317  *
2318  * There are some functions which can sleep for arbitrary periods
2319  * (paste_selection) but we don't need the lock there anyway.
2320  *
2321  * set_selection has locking, and definitely needs it
2322  */
2323
2324 int tioclinux(struct tty_struct *tty, unsigned long arg)
2325 {
2326         char type, data;
2327         char __user *p = (char __user *)arg;
2328         int lines;
2329         int ret;
2330
2331         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2332                 return -EINVAL;
2333         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2334                 return -EPERM;
2335         if (get_user(type, p))
2336                 return -EFAULT;
2337         ret = 0;
2338         switch (type)
2339         {
2340                 case TIOCL_SETSEL:
2341                         acquire_console_sem();
2342                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2343                         release_console_sem();
2344                         break;
2345                 case TIOCL_PASTESEL:
2346                         ret = paste_selection(tty);
2347                         break;
2348                 case TIOCL_UNBLANKSCREEN:
2349                         acquire_console_sem();
2350                         unblank_screen();
2351                         release_console_sem();
2352                         break;
2353                 case TIOCL_SELLOADLUT:
2354                         ret = sel_loadlut(p);
2355                         break;
2356                 case TIOCL_GETSHIFTSTATE:
2357                         
2358         /*
2359          * Make it possible to react to Shift+Mousebutton.
2360          * Note that 'shift_state' is an undocumented
2361          * kernel-internal variable; programs not closely
2362          * related to the kernel should not use this.
2363          */
2364                         data = shift_state;
2365                         ret = __put_user(data, p);
2366                         break;
2367                 case TIOCL_GETMOUSEREPORTING:
2368                         data = mouse_reporting();
2369                         ret = __put_user(data, p);
2370                         break;
2371                 case TIOCL_SETVESABLANK:
2372                         set_vesa_blanking(p);
2373                         break;
2374                 case TIOCL_GETKMSGREDIRECT:
2375                         data = kmsg_redirect;
2376                         ret = __put_user(data, p);
2377                         break;
2378                 case TIOCL_SETKMSGREDIRECT:
2379                         if (!capable(CAP_SYS_ADMIN)) {
2380                                 ret = -EPERM;
2381                         } else {
2382                                 if (get_user(data, p+1))
2383                                         ret = -EFAULT;
2384                                 else
2385                                         kmsg_redirect = data;
2386                         }
2387                         break;
2388                 case TIOCL_GETFGCONSOLE:
2389                         ret = fg_console;
2390                         break;
2391                 case TIOCL_SCROLLCONSOLE:
2392                         if (get_user(lines, (s32 __user *)(p+4))) {
2393                                 ret = -EFAULT;
2394                         } else {
2395                                 scrollfront(vc_cons[fg_console].d, lines);
2396                                 ret = 0;
2397                         }
2398                         break;
2399                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2400                         acquire_console_sem();
2401                         ignore_poke = 1;
2402                         do_blank_screen(0);
2403                         release_console_sem();
2404                         break;
2405                 case TIOCL_BLANKEDSCREEN:
2406                         ret = console_blanked;
2407                         break;
2408                 default:
2409                         ret = -EINVAL;
2410                         break;
2411         }
2412         return ret;
2413 }
2414
2415 /*
2416  * /dev/ttyN handling
2417  */
2418
2419 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2420 {
2421         int     retval;
2422
2423         retval = do_con_write(tty, buf, count);
2424         con_flush_chars(tty);
2425
2426         return retval;
2427 }
2428
2429 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2430 {
2431         if (in_interrupt())
2432                 return; /* n_r3964 calls put_char() from interrupt context */
2433         do_con_write(tty, &ch, 1);
2434 }
2435
2436 static int con_write_room(struct tty_struct *tty)
2437 {
2438         if (tty->stopped)
2439                 return 0;
2440         return 4096;            /* No limit, really; we're not buffering */
2441 }
2442
2443 static int con_chars_in_buffer(struct tty_struct *tty)
2444 {
2445         return 0;               /* we're not buffering */
2446 }
2447
2448 /*
2449  * con_throttle and con_unthrottle are only used for
2450  * paste_selection(), which has to stuff in a large number of
2451  * characters...
2452  */
2453 static void con_throttle(struct tty_struct *tty)
2454 {
2455 }
2456
2457 static void con_unthrottle(struct tty_struct *tty)
2458 {
2459         struct vc_data *vc = tty->driver_data;
2460
2461         wake_up_interruptible(&vc->paste_wait);
2462 }
2463
2464 /*
2465  * Turn the Scroll-Lock LED on when the tty is stopped
2466  */
2467 static void con_stop(struct tty_struct *tty)
2468 {
2469         int console_num;
2470         if (!tty)
2471                 return;
2472         console_num = tty->index;
2473         if (!vc_cons_allocated(console_num))
2474                 return;
2475         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2476         set_leds();
2477 }
2478
2479 /*
2480  * Turn the Scroll-Lock LED off when the console is started
2481  */
2482 static void con_start(struct tty_struct *tty)
2483 {
2484         int console_num;
2485         if (!tty)
2486                 return;
2487         console_num = tty->index;
2488         if (!vc_cons_allocated(console_num))
2489                 return;
2490         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2491         set_leds();
2492 }
2493
2494 static void con_flush_chars(struct tty_struct *tty)
2495 {
2496         struct vc_data *vc;
2497
2498         if (in_interrupt())     /* from flush_to_ldisc */
2499                 return;
2500
2501         /* if we race with con_close(), vt may be null */
2502         acquire_console_sem();
2503         vc = tty->driver_data;
2504         if (vc)
2505                 set_cursor(vc);
2506         release_console_sem();
2507 }
2508
2509 /*
2510  * Allocate the console screen memory.
2511  */
2512 static int con_open(struct tty_struct *tty, struct file *filp)
2513 {
2514         unsigned int currcons = tty->index;
2515         int ret = 0;
2516
2517         acquire_console_sem();
2518         if (tty->driver_data == NULL) {
2519                 ret = vc_allocate(currcons);
2520                 if (ret == 0) {
2521                         struct vc_data *vc = vc_cons[currcons].d;
2522                         tty->driver_data = vc;
2523                         vc->vc_tty = tty;
2524
2525                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2526                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2527                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2528                         }
2529                         release_console_sem();
2530                         vcs_make_sysfs(tty);
2531                         return ret;
2532                 }
2533         }
2534         release_console_sem();
2535         return ret;
2536 }
2537
2538 /*
2539  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2540  * and taking a ref against the tty while we're in the process of forgetting
2541  * about it and cleaning things up.
2542  *
2543  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2544  */
2545 static void con_close(struct tty_struct *tty, struct file *filp)
2546 {
2547         mutex_lock(&tty_mutex);
2548         acquire_console_sem();
2549         if (tty && tty->count == 1) {
2550                 struct vc_data *vc = tty->driver_data;
2551
2552                 if (vc)
2553                         vc->vc_tty = NULL;
2554                 tty->driver_data = NULL;
2555                 release_console_sem();
2556                 vcs_remove_sysfs(tty);
2557                 mutex_unlock(&tty_mutex);
2558                 /*
2559                  * tty_mutex is released, but we still hold BKL, so there is
2560                  * still exclusion against init_dev()
2561                  */
2562                 return;
2563         }
2564         release_console_sem();
2565         mutex_unlock(&tty_mutex);
2566 }
2567
2568 static void vc_init(struct vc_data *vc, unsigned int rows,
2569                     unsigned int cols, int do_clear)
2570 {
2571         int j, k ;
2572
2573         vc->vc_cols = cols;
2574         vc->vc_rows = rows;
2575         vc->vc_size_row = cols << 1;
2576         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2577
2578         set_origin(vc);
2579         vc->vc_pos = vc->vc_origin;
2580         reset_vc(vc);
2581         for (j=k=0; j<16; j++) {
2582                 vc->vc_palette[k++] = default_red[j] ;
2583                 vc->vc_palette[k++] = default_grn[j] ;
2584                 vc->vc_palette[k++] = default_blu[j] ;
2585         }
2586         vc->vc_def_color       = 0x07;   /* white */
2587         vc->vc_ulcolor          = 0x0f;   /* bold white */
2588         vc->vc_halfcolor       = 0x08;   /* grey */
2589         init_waitqueue_head(&vc->paste_wait);
2590         reset_terminal(vc, do_clear);
2591 }
2592
2593 /*
2594  * This routine initializes console interrupts, and does nothing
2595  * else. If you want the screen to clear, call tty_write with
2596  * the appropriate escape-sequence.
2597  */
2598
2599 static int __init con_init(void)
2600 {
2601         const char *display_desc = NULL;
2602         struct vc_data *vc;
2603         unsigned int currcons = 0, i;
2604
2605         acquire_console_sem();
2606
2607         if (conswitchp)
2608                 display_desc = conswitchp->con_startup();
2609         if (!display_desc) {
2610                 fg_console = 0;
2611                 release_console_sem();
2612                 return 0;
2613         }
2614
2615         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2616                 struct con_driver *con_driver = &registered_con_driver[i];
2617
2618                 if (con_driver->con == NULL) {
2619                         con_driver->con = conswitchp;
2620                         con_driver->desc = display_desc;
2621                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2622                         con_driver->first = 0;
2623                         con_driver->last = MAX_NR_CONSOLES - 1;
2624                         break;
2625                 }
2626         }
2627
2628         for (i = 0; i < MAX_NR_CONSOLES; i++)
2629                 con_driver_map[i] = conswitchp;
2630
2631         init_timer(&console_timer);
2632         console_timer.function = blank_screen_t;
2633         if (blankinterval) {
2634                 blank_state = blank_normal_wait;
2635                 mod_timer(&console_timer, jiffies + blankinterval);
2636         }
2637
2638         /*
2639          * kmalloc is not running yet - we use the bootmem allocator.
2640          */
2641         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2642                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2643                 visual_init(vc, currcons, 1);
2644                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2645                 vc->vc_kmalloced = 0;
2646                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2647                         currcons || !vc->vc_sw->con_save_screen);
2648         }
2649         currcons = fg_console = 0;
2650         master_display_fg = vc = vc_cons[currcons].d;
2651         set_origin(vc);
2652         save_screen(vc);
2653         gotoxy(vc, vc->vc_x, vc->vc_y);
2654         csi_J(vc, 0);
2655         update_screen(vc);
2656         printk("Console: %s %s %dx%d",
2657                 vc->vc_can_do_color ? "colour" : "mono",
2658                 display_desc, vc->vc_cols, vc->vc_rows);
2659         printable = 1;
2660         printk("\n");
2661
2662         release_console_sem();
2663
2664 #ifdef CONFIG_VT_CONSOLE
2665         register_console(&vt_console_driver);
2666 #endif
2667         return 0;
2668 }
2669 console_initcall(con_init);
2670
2671 static const struct tty_operations con_ops = {
2672         .open = con_open,
2673         .close = con_close,
2674         .write = con_write,
2675         .write_room = con_write_room,
2676         .put_char = con_put_char,
2677         .flush_chars = con_flush_chars,
2678         .chars_in_buffer = con_chars_in_buffer,
2679         .ioctl = vt_ioctl,
2680         .stop = con_stop,
2681         .start = con_start,
2682         .throttle = con_throttle,
2683         .unthrottle = con_unthrottle,
2684 };
2685
2686 int __init vty_init(void)
2687 {
2688         vcs_init();
2689
2690         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2691         if (!console_driver)
2692                 panic("Couldn't allocate console driver\n");
2693         console_driver->owner = THIS_MODULE;
2694         console_driver->name = "tty";
2695         console_driver->name_base = 1;
2696         console_driver->major = TTY_MAJOR;
2697         console_driver->minor_start = 1;
2698         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2699         console_driver->init_termios = tty_std_termios;
2700         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2701         tty_set_operations(console_driver, &con_ops);
2702         if (tty_register_driver(console_driver))
2703                 panic("Couldn't register console driver\n");
2704
2705         kbd_init();
2706         console_map_init();
2707 #ifdef CONFIG_PROM_CONSOLE
2708         prom_con_init();
2709 #endif
2710 #ifdef CONFIG_MDA_CONSOLE
2711         mda_console_init();
2712 #endif
2713         return 0;
2714 }
2715
2716 #ifndef VT_SINGLE_DRIVER
2717 #include <linux/device.h>
2718
2719 static struct class *vtconsole_class;
2720
2721 static int bind_con_driver(const struct consw *csw, int first, int last,
2722                            int deflt)
2723 {
2724         struct module *owner = csw->owner;
2725         const char *desc = NULL;
2726         struct con_driver *con_driver;
2727         int i, j = -1, k = -1, retval = -ENODEV;
2728
2729         if (!try_module_get(owner))
2730                 return -ENODEV;
2731
2732         acquire_console_sem();
2733
2734         /* check if driver is registered */
2735         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2736                 con_driver = &registered_con_driver[i];
2737
2738                 if (con_driver->con == csw) {
2739                         desc = con_driver->desc;
2740                         retval = 0;
2741                         break;
2742                 }
2743         }
2744
2745         if (retval)
2746                 goto err;
2747
2748         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2749                 csw->con_startup();
2750                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2751         }
2752
2753         if (deflt) {
2754                 if (conswitchp)
2755                         module_put(conswitchp->owner);
2756
2757                 __module_get(owner);
2758                 conswitchp = csw;
2759         }
2760
2761         first = max(first, con_driver->first);
2762         last = min(last, con_driver->last);
2763
2764         for (i = first; i <= last; i++) {
2765                 int old_was_color;
2766                 struct vc_data *vc = vc_cons[i].d;
2767
2768                 if (con_driver_map[i])
2769                         module_put(con_driver_map[i]->owner);
2770                 __module_get(owner);
2771                 con_driver_map[i] = csw;
2772
2773                 if (!vc || !vc->vc_sw)
2774                         continue;
2775
2776                 j = i;
2777
2778                 if (CON_IS_VISIBLE(vc)) {
2779                         k = i;
2780                         save_screen(vc);
2781                 }
2782
2783                 old_was_color = vc->vc_can_do_color;
2784                 vc->vc_sw->con_deinit(vc);
2785                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2786                 visual_init(vc, i, 0);
2787                 set_origin(vc);
2788                 update_attr(vc);
2789
2790                 /* If the console changed between mono <-> color, then
2791                  * the attributes in the screenbuf will be wrong.  The
2792                  * following resets all attributes to something sane.
2793                  */
2794                 if (old_was_color != vc->vc_can_do_color)
2795                         clear_buffer_attributes(vc);
2796         }
2797
2798         printk("Console: switching ");
2799         if (!deflt)
2800                 printk("consoles %d-%d ", first+1, last+1);
2801         if (j >= 0) {
2802                 struct vc_data *vc = vc_cons[j].d;
2803
2804                 printk("to %s %s %dx%d\n",
2805                        vc->vc_can_do_color ? "colour" : "mono",
2806                        desc, vc->vc_cols, vc->vc_rows);
2807
2808                 if (k >= 0) {
2809                         vc = vc_cons[k].d;
2810                         update_screen(vc);
2811                 }
2812         } else
2813                 printk("to %s\n", desc);
2814
2815         retval = 0;
2816 err:
2817         release_console_sem();
2818         module_put(owner);
2819         return retval;
2820 };
2821
2822 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2823 static int con_is_graphics(const struct consw *csw, int first, int last)
2824 {
2825         int i, retval = 0;
2826
2827         for (i = first; i <= last; i++) {
2828                 struct vc_data *vc = vc_cons[i].d;
2829
2830                 if (vc && vc->vc_mode == KD_GRAPHICS) {
2831                         retval = 1;
2832                         break;
2833                 }
2834         }
2835
2836         return retval;
2837 }
2838
2839 static int unbind_con_driver(const struct consw *csw, int first, int last,
2840                              int deflt)
2841 {
2842         struct module *owner = csw->owner;
2843         const struct consw *defcsw = NULL;
2844         struct con_driver *con_driver = NULL, *con_back = NULL;
2845         int i, retval = -ENODEV;
2846
2847         if (!try_module_get(owner))
2848                 return -ENODEV;
2849
2850         acquire_console_sem();
2851
2852         /* check if driver is registered and if it is unbindable */
2853         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2854                 con_driver = &registered_con_driver[i];
2855
2856                 if (con_driver->con == csw &&
2857                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
2858                         retval = 0;
2859                         break;
2860                 }
2861         }
2862
2863         if (retval) {
2864                 release_console_sem();
2865                 goto err;
2866         }
2867
2868         retval = -ENODEV;
2869
2870         /* check if backup driver exists */
2871         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2872                 con_back = &registered_con_driver[i];
2873
2874                 if (con_back->con &&
2875                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
2876                         defcsw = con_back->con;
2877                         retval = 0;
2878                         break;
2879                 }
2880         }
2881
2882         if (retval) {
2883                 release_console_sem();
2884                 goto err;
2885         }
2886
2887         if (!con_is_bound(csw)) {
2888                 release_console_sem();
2889                 goto err;
2890         }
2891
2892         first = max(first, con_driver->first);
2893         last = min(last, con_driver->last);
2894
2895         for (i = first; i <= last; i++) {
2896                 if (con_driver_map[i] == csw) {
2897                         module_put(csw->owner);
2898                         con_driver_map[i] = NULL;
2899                 }
2900         }
2901
2902         if (!con_is_bound(defcsw)) {
2903                 const struct consw *defconsw = conswitchp;
2904
2905                 defcsw->con_startup();
2906                 con_back->flag |= CON_DRIVER_FLAG_INIT;
2907                 /*
2908                  * vgacon may change the default driver to point
2909                  * to dummycon, we restore it here...
2910                  */
2911                 conswitchp = defconsw;
2912         }
2913
2914         if (!con_is_bound(csw))
2915                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
2916
2917         release_console_sem();
2918         /* ignore return value, binding should not fail */
2919         bind_con_driver(defcsw, first, last, deflt);
2920 err:
2921         module_put(owner);
2922         return retval;
2923
2924 }
2925
2926 static int vt_bind(struct con_driver *con)
2927 {
2928         const struct consw *defcsw = NULL, *csw = NULL;
2929         int i, more = 1, first = -1, last = -1, deflt = 0;
2930
2931         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2932             con_is_graphics(con->con, con->first, con->last))
2933                 goto err;
2934
2935         csw = con->con;
2936
2937         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2938                 struct con_driver *con = &registered_con_driver[i];
2939
2940                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
2941                         defcsw = con->con;
2942                         break;
2943                 }
2944         }
2945
2946         if (!defcsw)
2947                 goto err;
2948
2949         while (more) {
2950                 more = 0;
2951
2952                 for (i = con->first; i <= con->last; i++) {
2953                         if (con_driver_map[i] == defcsw) {
2954                                 if (first == -1)
2955                                         first = i;
2956                                 last = i;
2957                                 more = 1;
2958                         } else if (first != -1)
2959                                 break;
2960                 }
2961
2962                 if (first == 0 && last == MAX_NR_CONSOLES -1)
2963                         deflt = 1;
2964
2965                 if (first != -1)
2966                         bind_con_driver(csw, first, last, deflt);
2967
2968                 first = -1;
2969                 last = -1;
2970                 deflt = 0;
2971         }
2972
2973 err:
2974         return 0;
2975 }
2976
2977 static int vt_unbind(struct con_driver *con)
2978 {
2979         const struct consw *csw = NULL;
2980         int i, more = 1, first = -1, last = -1, deflt = 0;
2981
2982         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2983             con_is_graphics(con->con, con->first, con->last))
2984                 goto err;
2985
2986         csw = con->con;
2987
2988         while (more) {
2989                 more = 0;
2990
2991                 for (i = con->first; i <= con->last; i++) {
2992                         if (con_driver_map[i] == csw) {
2993                                 if (first == -1)
2994                                         first = i;
2995                                 last = i;
2996                                 more = 1;
2997                         } else if (first != -1)
2998                                 break;
2999                 }
3000
3001                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3002                         deflt = 1;
3003
3004                 if (first != -1)
3005                         unbind_con_driver(csw, first, last, deflt);
3006
3007                 first = -1;
3008                 last = -1;
3009                 deflt = 0;
3010         }
3011
3012 err:
3013         return 0;
3014 }
3015 #else
3016 static inline int vt_bind(struct con_driver *con)
3017 {
3018         return 0;
3019 }
3020 static inline int vt_unbind(struct con_driver *con)
3021 {
3022         return 0;
3023 }
3024 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3025
3026 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3027                           const char *buf, size_t count)
3028 {
3029         struct con_driver *con = dev_get_drvdata(dev);
3030         int bind = simple_strtoul(buf, NULL, 0);
3031
3032         if (bind)
3033                 vt_bind(con);
3034         else
3035                 vt_unbind(con);
3036
3037         return count;
3038 }
3039
3040 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3041                          char *buf)
3042 {
3043         struct con_driver *con = dev_get_drvdata(dev);
3044         int bind = con_is_bound(con->con);
3045
3046         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3047 }
3048
3049 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3050                          char *buf)
3051 {
3052         struct con_driver *con = dev_get_drvdata(dev);
3053
3054         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3055                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3056                          con->desc);
3057
3058 }
3059
3060 static struct device_attribute device_attrs[] = {
3061         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3062         __ATTR(name, S_IRUGO, show_name, NULL),
3063 };
3064
3065 static int vtconsole_init_device(struct con_driver *con)
3066 {
3067         int i;
3068         int error = 0;
3069
3070         con->flag |= CON_DRIVER_FLAG_ATTR;
3071         dev_set_drvdata(con->dev, con);
3072         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3073                 error = device_create_file(con->dev, &device_attrs[i]);
3074                 if (error)
3075                         break;
3076         }
3077
3078         if (error) {
3079                 while (--i >= 0)
3080                         device_remove_file(con->dev, &device_attrs[i]);
3081                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3082         }
3083
3084         return error;
3085 }
3086
3087 static void vtconsole_deinit_device(struct con_driver *con)
3088 {
3089         int i;
3090
3091         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3092                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3093                         device_remove_file(con->dev, &device_attrs[i]);
3094                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3095         }
3096 }
3097
3098 /**
3099  * con_is_bound - checks if driver is bound to the console
3100  * @csw: console driver
3101  *
3102  * RETURNS: zero if unbound, nonzero if bound
3103  *
3104  * Drivers can call this and if zero, they should release
3105  * all resources allocated on con_startup()
3106  */
3107 int con_is_bound(const struct consw *csw)
3108 {
3109         int i, bound = 0;
3110
3111         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3112                 if (con_driver_map[i] == csw) {
3113                         bound = 1;
3114                         break;
3115                 }
3116         }
3117
3118         return bound;
3119 }
3120 EXPORT_SYMBOL(con_is_bound);
3121
3122 /**
3123  * register_con_driver - register console driver to console layer
3124  * @csw: console driver
3125  * @first: the first console to take over, minimum value is 0
3126  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3127  *
3128  * DESCRIPTION: This function registers a console driver which can later
3129  * bind to a range of consoles specified by @first and @last. It will
3130  * also initialize the console driver by calling con_startup().
3131  */
3132 int register_con_driver(const struct consw *csw, int first, int last)
3133 {
3134         struct module *owner = csw->owner;
3135         struct con_driver *con_driver;
3136         const char *desc;
3137         int i, retval = 0;
3138
3139         if (!try_module_get(owner))
3140                 return -ENODEV;
3141
3142         acquire_console_sem();
3143
3144         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3145                 con_driver = &registered_con_driver[i];
3146
3147                 /* already registered */
3148                 if (con_driver->con == csw)
3149                         retval = -EINVAL;
3150         }
3151
3152         if (retval)
3153                 goto err;
3154
3155         desc = csw->con_startup();
3156
3157         if (!desc)
3158                 goto err;
3159
3160         retval = -EINVAL;
3161
3162         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3163                 con_driver = &registered_con_driver[i];
3164
3165                 if (con_driver->con == NULL) {
3166                         con_driver->con = csw;
3167                         con_driver->desc = desc;
3168                         con_driver->node = i;
3169                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3170                                            CON_DRIVER_FLAG_INIT;
3171                         con_driver->first = first;
3172                         con_driver->last = last;
3173                         retval = 0;
3174                         break;
3175                 }
3176         }
3177
3178         if (retval)
3179                 goto err;
3180
3181         con_driver->dev = device_create(vtconsole_class, NULL,
3182                                         MKDEV(0, con_driver->node),
3183                                         "vtcon%i", con_driver->node);
3184
3185         if (IS_ERR(con_driver->dev)) {
3186                 printk(KERN_WARNING "Unable to create device for %s; "
3187                        "errno = %ld\n", con_driver->desc,
3188                        PTR_ERR(con_driver->dev));
3189                 con_driver->dev = NULL;
3190         } else {
3191                 vtconsole_init_device(con_driver);
3192         }
3193
3194 err:
3195         release_console_sem();
3196         module_put(owner);
3197         return retval;
3198 }
3199 EXPORT_SYMBOL(register_con_driver);
3200
3201 /**
3202  * unregister_con_driver - unregister console driver from console layer
3203  * @csw: console driver
3204  *
3205  * DESCRIPTION: All drivers that registers to the console layer must
3206  * call this function upon exit, or if the console driver is in a state
3207  * where it won't be able to handle console services, such as the
3208  * framebuffer console without loaded framebuffer drivers.
3209  *
3210  * The driver must unbind first prior to unregistration.
3211  */
3212 int unregister_con_driver(const struct consw *csw)
3213 {
3214         int i, retval = -ENODEV;
3215
3216         acquire_console_sem();
3217
3218         /* cannot unregister a bound driver */
3219         if (con_is_bound(csw))
3220                 goto err;
3221
3222         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3223                 struct con_driver *con_driver = &registered_con_driver[i];
3224
3225                 if (con_driver->con == csw &&
3226                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3227                         vtconsole_deinit_device(con_driver);
3228                         device_destroy(vtconsole_class,
3229                                        MKDEV(0, con_driver->node));
3230                         con_driver->con = NULL;
3231                         con_driver->desc = NULL;
3232                         con_driver->dev = NULL;
3233                         con_driver->node = 0;
3234                         con_driver->flag = 0;
3235                         con_driver->first = 0;
3236                         con_driver->last = 0;
3237                         retval = 0;
3238                         break;
3239                 }
3240         }
3241 err:
3242         release_console_sem();
3243         return retval;
3244 }
3245 EXPORT_SYMBOL(unregister_con_driver);
3246
3247 /*
3248  *      If we support more console drivers, this function is used
3249  *      when a driver wants to take over some existing consoles
3250  *      and become default driver for newly opened ones.
3251  *
3252  *      take_over_console is basically a register followed by unbind
3253  */
3254 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3255 {
3256         int err;
3257
3258         err = register_con_driver(csw, first, last);
3259
3260         if (!err)
3261                 bind_con_driver(csw, first, last, deflt);
3262
3263         return err;
3264 }
3265
3266 /*
3267  * give_up_console is a wrapper to unregister_con_driver. It will only
3268  * work if driver is fully unbound.
3269  */
3270 void give_up_console(const struct consw *csw)
3271 {
3272         unregister_con_driver(csw);
3273 }
3274
3275 static int __init vtconsole_class_init(void)
3276 {
3277         int i;
3278
3279         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3280         if (IS_ERR(vtconsole_class)) {
3281                 printk(KERN_WARNING "Unable to create vt console class; "
3282                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3283                 vtconsole_class = NULL;
3284         }
3285
3286         /* Add system drivers to sysfs */
3287         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3288                 struct con_driver *con = &registered_con_driver[i];
3289
3290                 if (con->con && !con->dev) {
3291                         con->dev = device_create(vtconsole_class, NULL,
3292                                                  MKDEV(0, con->node),
3293                                                  "vtcon%i", con->node);
3294
3295                         if (IS_ERR(con->dev)) {
3296                                 printk(KERN_WARNING "Unable to create "
3297                                        "device for %s; errno = %ld\n",
3298                                        con->desc, PTR_ERR(con->dev));
3299                                 con->dev = NULL;
3300                         } else {
3301                                 vtconsole_init_device(con);
3302                         }
3303                 }
3304         }
3305
3306         return 0;
3307 }
3308 postcore_initcall(vtconsole_class_init);
3309
3310 #endif
3311
3312 /*
3313  *      Screen blanking
3314  */
3315
3316 static void set_vesa_blanking(char __user *p)
3317 {
3318     unsigned int mode;
3319     get_user(mode, p + 1);
3320     vesa_blank_mode = (mode < 4) ? mode : 0;
3321 }
3322
3323 void do_blank_screen(int entering_gfx)
3324 {
3325         struct vc_data *vc = vc_cons[fg_console].d;
3326         int i;
3327
3328         WARN_CONSOLE_UNLOCKED();
3329
3330         if (console_blanked) {
3331                 if (blank_state == blank_vesa_wait) {
3332                         blank_state = blank_off;
3333                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3334                 }
3335                 return;
3336         }
3337         if (blank_state != blank_normal_wait)
3338                 return;
3339         blank_state = blank_off;
3340
3341         /* entering graphics mode? */
3342         if (entering_gfx) {
3343                 hide_cursor(vc);
3344                 save_screen(vc);
3345                 vc->vc_sw->con_blank(vc, -1, 1);
3346                 console_blanked = fg_console + 1;
3347                 set_origin(vc);
3348                 return;
3349         }
3350
3351         /* don't blank graphics */
3352         if (vc->vc_mode != KD_TEXT) {
3353                 console_blanked = fg_console + 1;
3354                 return;
3355         }
3356
3357         hide_cursor(vc);
3358         del_timer_sync(&console_timer);
3359         blank_timer_expired = 0;
3360
3361         save_screen(vc);
3362         /* In case we need to reset origin, blanking hook returns 1 */
3363         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3364         console_blanked = fg_console + 1;
3365         if (i)
3366                 set_origin(vc);
3367
3368         if (console_blank_hook && console_blank_hook(1))
3369                 return;
3370
3371         if (vesa_off_interval && vesa_blank_mode) {
3372                 blank_state = blank_vesa_wait;
3373                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3374         }
3375 }
3376 EXPORT_SYMBOL(do_blank_screen);
3377
3378 /*
3379  * Called by timer as well as from vt_console_driver
3380  */
3381 void do_unblank_screen(int leaving_gfx)
3382 {
3383         struct vc_data *vc;
3384
3385         /* This should now always be called from a "sane" (read: can schedule)
3386          * context for the sake of the low level drivers, except in the special
3387          * case of oops_in_progress
3388          */
3389         if (!oops_in_progress)
3390                 might_sleep();
3391
3392         WARN_CONSOLE_UNLOCKED();
3393
3394         ignore_poke = 0;
3395         if (!console_blanked)
3396                 return;
3397         if (!vc_cons_allocated(fg_console)) {
3398                 /* impossible */
3399                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3400                 return;
3401         }
3402         vc = vc_cons[fg_console].d;
3403         if (vc->vc_mode != KD_TEXT)
3404                 return; /* but leave console_blanked != 0 */
3405
3406         if (blankinterval) {
3407                 mod_timer(&console_timer, jiffies + blankinterval);
3408                 blank_state = blank_normal_wait;
3409         }
3410
3411         console_blanked = 0;
3412         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3413                 /* Low-level driver cannot restore -> do it ourselves */
3414                 update_screen(vc);
3415         if (console_blank_hook)
3416                 console_blank_hook(0);
3417         set_palette(vc);
3418         set_cursor(vc);
3419 }
3420 EXPORT_SYMBOL(do_unblank_screen);
3421
3422 /*
3423  * This is called by the outside world to cause a forced unblank, mostly for
3424  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3425  * call it with 1 as an argument and so force a mode restore... that may kill
3426  * X or at least garbage the screen but would also make the Oops visible...
3427  */
3428 void unblank_screen(void)
3429 {
3430         do_unblank_screen(0);
3431 }
3432
3433 /*
3434  * We defer the timer blanking to work queue so it can take the console mutex
3435  * (console operations can still happen at irq time, but only from printk which
3436  * has the console mutex. Not perfect yet, but better than no locking
3437  */
3438 static void blank_screen_t(unsigned long dummy)
3439 {
3440         if (unlikely(!keventd_up())) {
3441                 mod_timer(&console_timer, jiffies + blankinterval);
3442                 return;
3443         }
3444         blank_timer_expired = 1;
3445         schedule_work(&console_work);
3446 }
3447
3448 void poke_blanked_console(void)
3449 {
3450         WARN_CONSOLE_UNLOCKED();
3451
3452         /* Add this so we quickly catch whoever might call us in a non
3453          * safe context. Nowadays, unblank_screen() isn't to be called in
3454          * atomic contexts and is allowed to schedule (with the special case
3455          * of oops_in_progress, but that isn't of any concern for this
3456          * function. --BenH.
3457          */
3458         might_sleep();
3459
3460         /* This isn't perfectly race free, but a race here would be mostly harmless,
3461          * at worse, we'll do a spurrious blank and it's unlikely
3462          */
3463         del_timer(&console_timer);
3464         blank_timer_expired = 0;
3465
3466         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3467                 return;
3468         if (console_blanked)
3469                 unblank_screen();
3470         else if (blankinterval) {
3471                 mod_timer(&console_timer, jiffies + blankinterval);
3472                 blank_state = blank_normal_wait;
3473         }
3474 }
3475
3476 /*
3477  *      Palettes
3478  */
3479
3480 static void set_palette(struct vc_data *vc)
3481 {
3482         WARN_CONSOLE_UNLOCKED();
3483
3484         if (vc->vc_mode != KD_GRAPHICS)
3485                 vc->vc_sw->con_set_palette(vc, color_table);
3486 }
3487
3488 static int set_get_cmap(unsigned char __user *arg, int set)
3489 {
3490     int i, j, k;
3491
3492     WARN_CONSOLE_UNLOCKED();
3493
3494     for (i = 0; i < 16; i++)
3495         if (set) {
3496             get_user(default_red[i], arg++);
3497             get_user(default_grn[i], arg++);
3498             get_user(default_blu[i], arg++);
3499         } else {
3500             put_user(default_red[i], arg++);
3501             put_user(default_grn[i], arg++);
3502             put_user(default_blu[i], arg++);
3503         }
3504     if (set) {
3505         for (i = 0; i < MAX_NR_CONSOLES; i++)
3506             if (vc_cons_allocated(i)) {
3507                 for (j = k = 0; j < 16; j++) {
3508                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3509                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3510                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3511                 }
3512                 set_palette(vc_cons[i].d);
3513             }
3514     }
3515     return 0;
3516 }
3517
3518 /*
3519  * Load palette into the DAC registers. arg points to a colour
3520  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3521  */
3522
3523 int con_set_cmap(unsigned char __user *arg)
3524 {
3525         int rc;
3526
3527         acquire_console_sem();
3528         rc = set_get_cmap (arg,1);
3529         release_console_sem();
3530
3531         return rc;
3532 }
3533
3534 int con_get_cmap(unsigned char __user *arg)
3535 {
3536         int rc;
3537
3538         acquire_console_sem();
3539         rc = set_get_cmap (arg,0);
3540         release_console_sem();
3541
3542         return rc;
3543 }
3544
3545 void reset_palette(struct vc_data *vc)
3546 {
3547         int j, k;
3548         for (j=k=0; j<16; j++) {
3549                 vc->vc_palette[k++] = default_red[j];
3550                 vc->vc_palette[k++] = default_grn[j];
3551                 vc->vc_palette[k++] = default_blu[j];
3552         }
3553         set_palette(vc);
3554 }
3555
3556 /*
3557  *  Font switching
3558  *
3559  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3560  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 
3561  *  depending on width) reserved for each character which is kinda wasty, but 
3562  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It 
3563  *  is upto the actual low-level console-driver convert data into its favorite
3564  *  format (maybe we should add a `fontoffset' field to the `display'
3565  *  structure so we won't have to convert the fontdata all the time.
3566  *  /Jes
3567  */
3568
3569 #define max_font_size 65536
3570
3571 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3572 {
3573         struct console_font font;
3574         int rc = -EINVAL;
3575         int c;
3576
3577         if (vc->vc_mode != KD_TEXT)
3578                 return -EINVAL;
3579
3580         if (op->data) {
3581                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3582                 if (!font.data)
3583                         return -ENOMEM;
3584         } else
3585                 font.data = NULL;
3586
3587         acquire_console_sem();
3588         if (vc->vc_sw->con_font_get)
3589                 rc = vc->vc_sw->con_font_get(vc, &font);
3590         else
3591                 rc = -ENOSYS;
3592         release_console_sem();
3593
3594         if (rc)
3595                 goto out;
3596
3597         c = (font.width+7)/8 * 32 * font.charcount;
3598         
3599         if (op->data && font.charcount > op->charcount)
3600                 rc = -ENOSPC;
3601         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3602                 if (font.width > op->width || font.height > op->height) 
3603                         rc = -ENOSPC;
3604         } else {
3605                 if (font.width != 8)
3606                         rc = -EIO;
3607                 else if ((op->height && font.height > op->height) ||
3608                          font.height > 32)
3609                         rc = -ENOSPC;
3610         }
3611         if (rc)
3612                 goto out;
3613
3614         op->height = font.height;
3615         op->width = font.width;
3616         op->charcount = font.charcount;
3617
3618         if (op->data && copy_to_user(op->data, font.data, c))
3619                 rc = -EFAULT;
3620
3621 out:
3622         kfree(font.data);
3623         return rc;
3624 }
3625
3626 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3627 {
3628         struct console_font font;
3629         int rc = -EINVAL;
3630         int size;
3631
3632         if (vc->vc_mode != KD_TEXT)
3633                 return -EINVAL;
3634         if (!op->data)
3635                 return -EINVAL;
3636         if (op->charcount > 512)
3637                 return -EINVAL;
3638         if (!op->height) {              /* Need to guess font height [compat] */
3639                 int h, i;
3640                 u8 __user *charmap = op->data;
3641                 u8 tmp;
3642                 
3643                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3644                    so that we can get rid of this soon */
3645                 if (!(op->flags & KD_FONT_FLAG_OLD))
3646                         return -EINVAL;
3647                 for (h = 32; h > 0; h--)
3648                         for (i = 0; i < op->charcount; i++) {
3649                                 if (get_user(tmp, &charmap[32*i+h-1]))
3650                                         return -EFAULT;
3651                                 if (tmp)
3652                                         goto nonzero;
3653                         }
3654                 return -EINVAL;
3655         nonzero:
3656                 op->height = h;
3657         }
3658         if (op->width <= 0 || op->width > 32 || op->height > 32)
3659                 return -EINVAL;
3660         size = (op->width+7)/8 * 32 * op->charcount;
3661         if (size > max_font_size)
3662                 return -ENOSPC;
3663         font.charcount = op->charcount;
3664         font.height = op->height;
3665         font.width = op->width;
3666         font.data = kmalloc(size, GFP_KERNEL);
3667         if (!font.data)
3668                 return -ENOMEM;
3669         if (copy_from_user(font.data, op->data, size)) {
3670                 kfree(font.data);
3671                 return -EFAULT;
3672         }
3673         acquire_console_sem();
3674         if (vc->vc_sw->con_font_set)
3675                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3676         else
3677                 rc = -ENOSYS;
3678         release_console_sem();
3679         kfree(font.data);
3680         return rc;
3681 }
3682
3683 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3684 {
3685         struct console_font font = {.width = op->width, .height = op->height};
3686         char name[MAX_FONT_NAME];
3687         char *s = name;
3688         int rc;
3689
3690         if (vc->vc_mode != KD_TEXT)
3691                 return -EINVAL;
3692
3693         if (!op->data)
3694                 s = NULL;
3695         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3696                 return -EFAULT;
3697         else
3698                 name[MAX_FONT_NAME - 1] = 0;
3699
3700         acquire_console_sem();
3701         if (vc->vc_sw->con_font_default)
3702                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3703         else
3704                 rc = -ENOSYS;
3705         release_console_sem();
3706         if (!rc) {
3707                 op->width = font.width;
3708                 op->height = font.height;
3709         }
3710         return rc;
3711 }
3712
3713 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3714 {
3715         int con = op->height;
3716         int rc;
3717
3718         if (vc->vc_mode != KD_TEXT)
3719                 return -EINVAL;
3720
3721         acquire_console_sem();
3722         if (!vc->vc_sw->con_font_copy)
3723                 rc = -ENOSYS;
3724         else if (con < 0 || !vc_cons_allocated(con))
3725                 rc = -ENOTTY;
3726         else if (con == vc->vc_num)     /* nothing to do */
3727                 rc = 0;
3728         else
3729                 rc = vc->vc_sw->con_font_copy(vc, con);
3730         release_console_sem();
3731         return rc;
3732 }
3733
3734 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3735 {
3736         switch (op->op) {
3737         case KD_FONT_OP_SET:
3738                 return con_font_set(vc, op);
3739         case KD_FONT_OP_GET:
3740                 return con_font_get(vc, op);
3741         case KD_FONT_OP_SET_DEFAULT:
3742                 return con_font_default(vc, op);
3743         case KD_FONT_OP_COPY:
3744                 return con_font_copy(vc, op);
3745         }
3746         return -ENOSYS;
3747 }
3748
3749 /*
3750  *      Interface exported to selection and vcs.
3751  */
3752
3753 /* used by selection */
3754 u16 screen_glyph(struct vc_data *vc, int offset)
3755 {
3756         u16 w = scr_readw(screenpos(vc, offset, 1));
3757         u16 c = w & 0xff;
3758
3759         if (w & vc->vc_hi_font_mask)
3760                 c |= 0x100;
3761         return c;
3762 }
3763
3764 /* used by vcs - note the word offset */
3765 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3766 {
3767         return screenpos(vc, 2 * w_offset, viewed);
3768 }
3769
3770 void getconsxy(struct vc_data *vc, unsigned char *p)
3771 {
3772         p[0] = vc->vc_x;
3773         p[1] = vc->vc_y;
3774 }
3775
3776 void putconsxy(struct vc_data *vc, unsigned char *p)
3777 {
3778         hide_cursor(vc);
3779         gotoxy(vc, p[0], p[1]);
3780         set_cursor(vc);
3781 }
3782
3783 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3784 {
3785         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3786                 return softcursor_original;
3787         return scr_readw(org);
3788 }
3789
3790 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3791 {
3792         scr_writew(val, org);
3793         if ((unsigned long)org == vc->vc_pos) {
3794                 softcursor_original = -1;
3795                 add_softcursor(vc);
3796         }
3797 }
3798
3799 /*
3800  *      Visible symbols for modules
3801  */
3802
3803 EXPORT_SYMBOL(color_table);
3804 EXPORT_SYMBOL(default_red);
3805 EXPORT_SYMBOL(default_grn);
3806 EXPORT_SYMBOL(default_blu);
3807 EXPORT_SYMBOL(update_region);
3808 EXPORT_SYMBOL(redraw_screen);
3809 EXPORT_SYMBOL(vc_resize);
3810 EXPORT_SYMBOL(vc_lock_resize);
3811 EXPORT_SYMBOL(fg_console);
3812 EXPORT_SYMBOL(console_blank_hook);
3813 EXPORT_SYMBOL(console_blanked);
3814 EXPORT_SYMBOL(vc_cons);
3815 #ifndef VT_SINGLE_DRIVER
3816 EXPORT_SYMBOL(take_over_console);
3817 EXPORT_SYMBOL(give_up_console);
3818 #endif