a398b6b6aa655d18f2897ef7b7dbaf0ee4cbd7cc
[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 class_device *class_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 extern void console_map_init(void);
143 #ifdef CONFIG_PROM_CONSOLE
144 extern void prom_con_init(void);
145 #endif
146 #ifdef CONFIG_MDA_CONSOLE
147 extern int mda_console_init(void);
148 #endif
149
150 struct vc vc_cons [MAX_NR_CONSOLES];
151
152 #ifndef VT_SINGLE_DRIVER
153 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
154 #endif
155
156 static int con_open(struct tty_struct *, struct file *);
157 static void vc_init(struct vc_data *vc, unsigned int rows,
158                     unsigned int cols, int do_clear);
159 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
160 static void save_cur(struct vc_data *vc);
161 static void reset_terminal(struct vc_data *vc, int do_clear);
162 static void con_flush_chars(struct tty_struct *tty);
163 static void set_vesa_blanking(char __user *p);
164 static void set_cursor(struct vc_data *vc);
165 static void hide_cursor(struct vc_data *vc);
166 static void console_callback(void *ignored);
167 static void blank_screen_t(unsigned long dummy);
168 static void set_palette(struct vc_data *vc);
169
170 static int printable;           /* Is console ready for printing? */
171
172 /*
173  * ignore_poke: don't unblank the screen when things are typed.  This is
174  * mainly for the privacy of braille terminal users.
175  */
176 static int ignore_poke;
177
178 int do_poke_blanked_console;
179 int console_blanked;
180
181 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
182 static int blankinterval = 10*60*HZ;
183 static int vesa_off_interval;
184
185 static DECLARE_WORK(console_work, console_callback, NULL);
186
187 /*
188  * fg_console is the current virtual console,
189  * last_console is the last used one,
190  * want_console is the console we want to switch to,
191  * kmsg_redirect is the console for kernel messages,
192  */
193 int fg_console;
194 int last_console;
195 int want_console = -1;
196 int kmsg_redirect;
197
198 /*
199  * For each existing display, we have a pointer to console currently visible
200  * on that display, allowing consoles other than fg_console to be refreshed
201  * appropriately. Unless the low-level driver supplies its own display_fg
202  * variable, we use this one for the "master display".
203  */
204 static struct vc_data *master_display_fg;
205
206 /*
207  * Unfortunately, we need to delay tty echo when we're currently writing to the
208  * console since the code is (and always was) not re-entrant, so we schedule
209  * all flip requests to process context with schedule-task() and run it from
210  * console_callback().
211  */
212
213 /*
214  * For the same reason, we defer scrollback to the console callback.
215  */
216 static int scrollback_delta;
217
218 /*
219  * Hook so that the power management routines can (un)blank
220  * the console on our behalf.
221  */
222 int (*console_blank_hook)(int);
223
224 static struct timer_list console_timer;
225 static int blank_state;
226 static int blank_timer_expired;
227 enum {
228         blank_off = 0,
229         blank_normal_wait,
230         blank_vesa_wait,
231 };
232
233 /*
234  *      Low-Level Functions
235  */
236
237 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
238
239 #ifdef VT_BUF_VRAM_ONLY
240 #define DO_UPDATE(vc)   0
241 #else
242 #define DO_UPDATE(vc)   CON_IS_VISIBLE(vc)
243 #endif
244
245 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
246 {
247         unsigned short *p;
248         
249         if (!viewed)
250                 p = (unsigned short *)(vc->vc_origin + offset);
251         else if (!vc->vc_sw->con_screen_pos)
252                 p = (unsigned short *)(vc->vc_visible_origin + offset);
253         else
254                 p = vc->vc_sw->con_screen_pos(vc, offset);
255         return p;
256 }
257
258 static inline void scrolldelta(int lines)
259 {
260         scrollback_delta += lines;
261         schedule_console_callback();
262 }
263
264 void schedule_console_callback(void)
265 {
266         schedule_work(&console_work);
267 }
268
269 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
270 {
271         unsigned short *d, *s;
272
273         if (t+nr >= b)
274                 nr = b - t - 1;
275         if (b > vc->vc_rows || t >= b || nr < 1)
276                 return;
277         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
278                 return;
279         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
280         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
281         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
282         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
283                     vc->vc_size_row * nr);
284 }
285
286 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
287 {
288         unsigned short *s;
289         unsigned int step;
290
291         if (t+nr >= b)
292                 nr = b - t - 1;
293         if (b > vc->vc_rows || t >= b || nr < 1)
294                 return;
295         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
296                 return;
297         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
298         step = vc->vc_cols * nr;
299         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
300         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
301 }
302
303 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
304 {
305 #ifndef VT_BUF_VRAM_ONLY
306         unsigned int xx, yy, offset;
307         u16 *p;
308
309         p = (u16 *) start;
310         if (!vc->vc_sw->con_getxy) {
311                 offset = (start - vc->vc_origin) / 2;
312                 xx = offset % vc->vc_cols;
313                 yy = offset / vc->vc_cols;
314         } else {
315                 int nxx, nyy;
316                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
317                 xx = nxx; yy = nyy;
318         }
319         for(;;) {
320                 u16 attrib = scr_readw(p) & 0xff00;
321                 int startx = xx;
322                 u16 *q = p;
323                 while (xx < vc->vc_cols && count) {
324                         if (attrib != (scr_readw(p) & 0xff00)) {
325                                 if (p > q)
326                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
327                                 startx = xx;
328                                 q = p;
329                                 attrib = scr_readw(p) & 0xff00;
330                         }
331                         p++;
332                         xx++;
333                         count--;
334                 }
335                 if (p > q)
336                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
337                 if (!count)
338                         break;
339                 xx = 0;
340                 yy++;
341                 if (vc->vc_sw->con_getxy) {
342                         p = (u16 *)start;
343                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
344                 }
345         }
346 #endif
347 }
348
349 void update_region(struct vc_data *vc, unsigned long start, int count)
350 {
351         WARN_CONSOLE_UNLOCKED();
352
353         if (DO_UPDATE(vc)) {
354                 hide_cursor(vc);
355                 do_update_region(vc, start, count);
356                 set_cursor(vc);
357         }
358 }
359
360 /* Structure of attributes is hardware-dependent */
361
362 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse)
363 {
364         if (vc->vc_sw->con_build_attr)
365                 return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse);
366
367 #ifndef VT_BUF_VRAM_ONLY
368 /*
369  * ++roman: I completely changed the attribute format for monochrome
370  * mode (!can_do_color). The formerly used MDA (monochrome display
371  * adapter) format didn't allow the combination of certain effects.
372  * Now the attribute is just a bit vector:
373  *  Bit 0..1: intensity (0..2)
374  *  Bit 2   : underline
375  *  Bit 3   : reverse
376  *  Bit 7   : blink
377  */
378         {
379         u8 a = vc->vc_color;
380         if (!vc->vc_can_do_color)
381                 return _intensity |
382                        (_underline ? 4 : 0) |
383                        (_reverse ? 8 : 0) |
384                        (_blink ? 0x80 : 0);
385         if (_underline)
386                 a = (a & 0xf0) | vc->vc_ulcolor;
387         else if (_intensity == 0)
388                 a = (a & 0xf0) | vc->vc_ulcolor;
389         if (_reverse)
390                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
391         if (_blink)
392                 a ^= 0x80;
393         if (_intensity == 2)
394                 a ^= 0x08;
395         if (vc->vc_hi_font_mask == 0x100)
396                 a <<= 1;
397         return a;
398         }
399 #else
400         return 0;
401 #endif
402 }
403
404 static void update_attr(struct vc_data *vc)
405 {
406         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm);
407         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm) << 8) | ' ';
408 }
409
410 /* Note: inverting the screen twice should revert to the original state */
411 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
412 {
413         unsigned short *p;
414
415         WARN_CONSOLE_UNLOCKED();
416
417         count /= 2;
418         p = screenpos(vc, offset, viewed);
419         if (vc->vc_sw->con_invert_region)
420                 vc->vc_sw->con_invert_region(vc, p, count);
421 #ifndef VT_BUF_VRAM_ONLY
422         else {
423                 u16 *q = p;
424                 int cnt = count;
425                 u16 a;
426
427                 if (!vc->vc_can_do_color) {
428                         while (cnt--) {
429                             a = scr_readw(q);
430                             a ^= 0x0800;
431                             scr_writew(a, q);
432                             q++;
433                         }
434                 } else if (vc->vc_hi_font_mask == 0x100) {
435                         while (cnt--) {
436                                 a = scr_readw(q);
437                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
438                                 scr_writew(a, q);
439                                 q++;
440                         }
441                 } else {
442                         while (cnt--) {
443                                 a = scr_readw(q);
444                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
445                                 scr_writew(a, q);
446                                 q++;
447                         }
448                 }
449         }
450 #endif
451         if (DO_UPDATE(vc))
452                 do_update_region(vc, (unsigned long) p, count);
453 }
454
455 /* used by selection: complement pointer position */
456 void complement_pos(struct vc_data *vc, int offset)
457 {
458         static int old_offset = -1;
459         static unsigned short old;
460         static unsigned short oldx, oldy;
461
462         WARN_CONSOLE_UNLOCKED();
463
464         if (old_offset != -1 && old_offset >= 0 &&
465             old_offset < vc->vc_screenbuf_size) {
466                 scr_writew(old, screenpos(vc, old_offset, 1));
467                 if (DO_UPDATE(vc))
468                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
469         }
470
471         old_offset = offset;
472
473         if (offset != -1 && offset >= 0 &&
474             offset < vc->vc_screenbuf_size) {
475                 unsigned short new;
476                 unsigned short *p;
477                 p = screenpos(vc, offset, 1);
478                 old = scr_readw(p);
479                 new = old ^ vc->vc_complement_mask;
480                 scr_writew(new, p);
481                 if (DO_UPDATE(vc)) {
482                         oldx = (offset >> 1) % vc->vc_cols;
483                         oldy = (offset >> 1) / vc->vc_cols;
484                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
485                 }
486         }
487
488 }
489
490 static void insert_char(struct vc_data *vc, unsigned int nr)
491 {
492         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
493
494         p = q + vc->vc_cols - nr - vc->vc_x;
495         while (--p >= q)
496                 scr_writew(scr_readw(p), p + nr);
497         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
498         vc->vc_need_wrap = 0;
499         if (DO_UPDATE(vc)) {
500                 unsigned short oldattr = vc->vc_attr;
501                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
502                                      vc->vc_cols - vc->vc_x - nr);
503                 vc->vc_attr = vc->vc_video_erase_char >> 8;
504                 while (nr--)
505                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
506                 vc->vc_attr = oldattr;
507         }
508 }
509
510 static void delete_char(struct vc_data *vc, unsigned int nr)
511 {
512         unsigned int i = vc->vc_x;
513         unsigned short *p = (unsigned short *)vc->vc_pos;
514
515         while (++i <= vc->vc_cols - nr) {
516                 scr_writew(scr_readw(p+nr), p);
517                 p++;
518         }
519         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
520         vc->vc_need_wrap = 0;
521         if (DO_UPDATE(vc)) {
522                 unsigned short oldattr = vc->vc_attr;
523                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
524                                      vc->vc_cols - vc->vc_x - nr);
525                 vc->vc_attr = vc->vc_video_erase_char >> 8;
526                 while (nr--)
527                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
528                                      vc->vc_cols - 1 - nr);
529                 vc->vc_attr = oldattr;
530         }
531 }
532
533 static int softcursor_original;
534
535 static void add_softcursor(struct vc_data *vc)
536 {
537         int i = scr_readw((u16 *) vc->vc_pos);
538         u32 type = vc->vc_cursor_type;
539
540         if (! (type & 0x10)) return;
541         if (softcursor_original != -1) return;
542         softcursor_original = i;
543         i |= ((type >> 8) & 0xff00 );
544         i ^= ((type) & 0xff00 );
545         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
546         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
547         scr_writew(i, (u16 *) vc->vc_pos);
548         if (DO_UPDATE(vc))
549                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
550 }
551
552 static void hide_softcursor(struct vc_data *vc)
553 {
554         if (softcursor_original != -1) {
555                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
556                 if (DO_UPDATE(vc))
557                         vc->vc_sw->con_putc(vc, softcursor_original,
558                                         vc->vc_y, vc->vc_x);
559                 softcursor_original = -1;
560         }
561 }
562
563 static void hide_cursor(struct vc_data *vc)
564 {
565         if (vc == sel_cons)
566                 clear_selection();
567         vc->vc_sw->con_cursor(vc, CM_ERASE);
568         hide_softcursor(vc);
569 }
570
571 static void set_cursor(struct vc_data *vc)
572 {
573         if (!IS_FG(vc) || console_blanked ||
574             vc->vc_mode == KD_GRAPHICS)
575                 return;
576         if (vc->vc_deccm) {
577                 if (vc == sel_cons)
578                         clear_selection();
579                 add_softcursor(vc);
580                 if ((vc->vc_cursor_type & 0x0f) != 1)
581                         vc->vc_sw->con_cursor(vc, CM_DRAW);
582         } else
583                 hide_cursor(vc);
584 }
585
586 static void set_origin(struct vc_data *vc)
587 {
588         WARN_CONSOLE_UNLOCKED();
589
590         if (!CON_IS_VISIBLE(vc) ||
591             !vc->vc_sw->con_set_origin ||
592             !vc->vc_sw->con_set_origin(vc))
593                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
594         vc->vc_visible_origin = vc->vc_origin;
595         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
596         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
597 }
598
599 static inline void save_screen(struct vc_data *vc)
600 {
601         WARN_CONSOLE_UNLOCKED();
602
603         if (vc->vc_sw->con_save_screen)
604                 vc->vc_sw->con_save_screen(vc);
605 }
606
607 /*
608  *      Redrawing of screen
609  */
610
611 static void clear_buffer_attributes(struct vc_data *vc)
612 {
613         unsigned short *p = (unsigned short *)vc->vc_origin;
614         int count = vc->vc_screenbuf_size / 2;
615         int mask = vc->vc_hi_font_mask | 0xff;
616
617         for (; count > 0; count--, p++) {
618                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
619         }
620 }
621
622 void redraw_screen(struct vc_data *vc, int is_switch)
623 {
624         int redraw = 0;
625
626         WARN_CONSOLE_UNLOCKED();
627
628         if (!vc) {
629                 /* strange ... */
630                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
631                 return;
632         }
633
634         if (is_switch) {
635                 struct vc_data *old_vc = vc_cons[fg_console].d;
636                 if (old_vc == vc)
637                         return;
638                 if (!CON_IS_VISIBLE(vc))
639                         redraw = 1;
640                 *vc->vc_display_fg = vc;
641                 fg_console = vc->vc_num;
642                 hide_cursor(old_vc);
643                 if (!CON_IS_VISIBLE(old_vc)) {
644                         save_screen(old_vc);
645                         set_origin(old_vc);
646                 }
647         } else {
648                 hide_cursor(vc);
649                 redraw = 1;
650         }
651
652         if (redraw) {
653                 int update;
654                 int old_was_color = vc->vc_can_do_color;
655
656                 set_origin(vc);
657                 update = vc->vc_sw->con_switch(vc);
658                 set_palette(vc);
659                 /*
660                  * If console changed from mono<->color, the best we can do
661                  * is to clear the buffer attributes. As it currently stands,
662                  * rebuilding new attributes from the old buffer is not doable
663                  * without overly complex code.
664                  */
665                 if (old_was_color != vc->vc_can_do_color) {
666                         update_attr(vc);
667                         clear_buffer_attributes(vc);
668                 }
669                 if (update && vc->vc_mode != KD_GRAPHICS)
670                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
671         }
672         set_cursor(vc);
673         if (is_switch) {
674                 set_leds();
675                 compute_shiftstate();
676         }
677 }
678
679 /*
680  *      Allocation, freeing and resizing of VTs.
681  */
682
683 int vc_cons_allocated(unsigned int i)
684 {
685         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
686 }
687
688 static void visual_init(struct vc_data *vc, int num, int init)
689 {
690         /* ++Geert: vc->vc_sw->con_init determines console size */
691         if (vc->vc_sw)
692                 module_put(vc->vc_sw->owner);
693         vc->vc_sw = conswitchp;
694 #ifndef VT_SINGLE_DRIVER
695         if (con_driver_map[num])
696                 vc->vc_sw = con_driver_map[num];
697 #endif
698         __module_get(vc->vc_sw->owner);
699         vc->vc_num = num;
700         vc->vc_display_fg = &master_display_fg;
701         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
702         vc->vc_uni_pagedir = 0;
703         vc->vc_hi_font_mask = 0;
704         vc->vc_complement_mask = 0;
705         vc->vc_can_do_color = 0;
706         vc->vc_sw->con_init(vc, init);
707         if (!vc->vc_complement_mask)
708                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
709         vc->vc_s_complement_mask = vc->vc_complement_mask;
710         vc->vc_size_row = vc->vc_cols << 1;
711         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
712 }
713
714 int vc_allocate(unsigned int currcons)  /* return 0 on success */
715 {
716         WARN_CONSOLE_UNLOCKED();
717
718         if (currcons >= MAX_NR_CONSOLES)
719                 return -ENXIO;
720         if (!vc_cons[currcons].d) {
721             struct vc_data *vc;
722
723             /* prevent users from taking too much memory */
724             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
725               return -EPERM;
726
727             /* due to the granularity of kmalloc, we waste some memory here */
728             /* the alloc is done in two steps, to optimize the common situation
729                of a 25x80 console (structsize=216, screenbuf_size=4000) */
730             /* although the numbers above are not valid since long ago, the
731                point is still up-to-date and the comment still has its value
732                even if only as a historical artifact.  --mj, July 1998 */
733             vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
734             if (!vc)
735                 return -ENOMEM;
736             memset(vc, 0, sizeof(*vc));
737             vc_cons[currcons].d = vc;
738             visual_init(vc, currcons, 1);
739             if (!*vc->vc_uni_pagedir_loc)
740                 con_set_default_unimap(vc);
741             if (!vc->vc_kmalloced)
742                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
743             if (!vc->vc_screenbuf) {
744                 kfree(vc);
745                 vc_cons[currcons].d = NULL;
746                 return -ENOMEM;
747             }
748             vc->vc_kmalloced = 1;
749             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
750         }
751         return 0;
752 }
753
754 static inline int resize_screen(struct vc_data *vc, int width, int height)
755 {
756         /* Resizes the resolution of the display adapater */
757         int err = 0;
758
759         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
760                 err = vc->vc_sw->con_resize(vc, width, height);
761         return err;
762 }
763
764 /*
765  * Change # of rows and columns (0 means unchanged/the size of fg_console)
766  * [this is to be used together with some user program
767  * like resize that changes the hardware videomode]
768  */
769 #define VC_RESIZE_MAXCOL (32767)
770 #define VC_RESIZE_MAXROW (32767)
771 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
772 {
773         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
774         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
775         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
776         unsigned int end;
777         unsigned short *newscreen;
778
779         WARN_CONSOLE_UNLOCKED();
780
781         if (!vc)
782                 return -ENXIO;
783
784         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
785                 return -EINVAL;
786
787         new_cols = (cols ? cols : vc->vc_cols);
788         new_rows = (lines ? lines : vc->vc_rows);
789         new_row_size = new_cols << 1;
790         new_screen_size = new_row_size * new_rows;
791
792         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
793                 return 0;
794
795         newscreen = (unsigned short *) kmalloc(new_screen_size, GFP_USER);
796         if (!newscreen)
797                 return -ENOMEM;
798
799         old_rows = vc->vc_rows;
800         old_cols = vc->vc_cols;
801         old_row_size = vc->vc_size_row;
802         old_screen_size = vc->vc_screenbuf_size;
803
804         err = resize_screen(vc, new_cols, new_rows);
805         if (err) {
806                 kfree(newscreen);
807                 return err;
808         }
809
810         vc->vc_rows = new_rows;
811         vc->vc_cols = new_cols;
812         vc->vc_size_row = new_row_size;
813         vc->vc_screenbuf_size = new_screen_size;
814
815         rlth = min(old_row_size, new_row_size);
816         rrem = new_row_size - rlth;
817         old_origin = vc->vc_origin;
818         new_origin = (long) newscreen;
819         new_scr_end = new_origin + new_screen_size;
820
821         if (vc->vc_y > new_rows) {
822                 if (old_rows - vc->vc_y < new_rows) {
823                         /*
824                          * Cursor near the bottom, copy contents from the
825                          * bottom of buffer
826                          */
827                         old_origin += (old_rows - new_rows) * old_row_size;
828                         end = vc->vc_scr_end;
829                 } else {
830                         /*
831                          * Cursor is in no man's land, copy 1/2 screenful
832                          * from the top and bottom of cursor position
833                          */
834                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
835                         end = old_origin + (old_row_size * new_rows);
836                 }
837         } else
838                 /*
839                  * Cursor near the top, copy contents from the top of buffer
840                  */
841                 end = (old_rows > new_rows) ? old_origin +
842                         (old_row_size * new_rows) :
843                         vc->vc_scr_end;
844
845         update_attr(vc);
846
847         while (old_origin < end) {
848                 scr_memcpyw((unsigned short *) new_origin,
849                             (unsigned short *) old_origin, rlth);
850                 if (rrem)
851                         scr_memsetw((void *)(new_origin + rlth),
852                                     vc->vc_video_erase_char, rrem);
853                 old_origin += old_row_size;
854                 new_origin += new_row_size;
855         }
856         if (new_scr_end > new_origin)
857                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
858                             new_scr_end - new_origin);
859         if (vc->vc_kmalloced)
860                 kfree(vc->vc_screenbuf);
861         vc->vc_screenbuf = newscreen;
862         vc->vc_kmalloced = 1;
863         vc->vc_screenbuf_size = new_screen_size;
864         set_origin(vc);
865
866         /* do part of a reset_terminal() */
867         vc->vc_top = 0;
868         vc->vc_bottom = vc->vc_rows;
869         gotoxy(vc, vc->vc_x, vc->vc_y);
870         save_cur(vc);
871
872         if (vc->vc_tty) {
873                 struct winsize ws, *cws = &vc->vc_tty->winsize;
874
875                 memset(&ws, 0, sizeof(ws));
876                 ws.ws_row = vc->vc_rows;
877                 ws.ws_col = vc->vc_cols;
878                 ws.ws_ypixel = vc->vc_scan_lines;
879                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
880                     vc->vc_tty->pgrp > 0)
881                         kill_pg(vc->vc_tty->pgrp, SIGWINCH, 1);
882                 *cws = ws;
883         }
884
885         if (CON_IS_VISIBLE(vc))
886                 update_screen(vc);
887         return err;
888 }
889
890 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
891 {
892         int rc;
893
894         acquire_console_sem();
895         rc = vc_resize(vc, cols, lines);
896         release_console_sem();
897         return rc;
898 }
899
900 void vc_deallocate(unsigned int currcons)
901 {
902         WARN_CONSOLE_UNLOCKED();
903
904         if (vc_cons_allocated(currcons)) {
905                 struct vc_data *vc = vc_cons[currcons].d;
906                 vc->vc_sw->con_deinit(vc);
907                 put_pid(vc->vt_pid);
908                 module_put(vc->vc_sw->owner);
909                 if (vc->vc_kmalloced)
910                         kfree(vc->vc_screenbuf);
911                 if (currcons >= MIN_NR_CONSOLES)
912                         kfree(vc);
913                 vc_cons[currcons].d = NULL;
914         }
915 }
916
917 /*
918  *      VT102 emulator
919  */
920
921 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
922 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
923 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
924
925 #define decarm          VC_REPEAT
926 #define decckm          VC_CKMODE
927 #define kbdapplic       VC_APPLIC
928 #define lnm             VC_CRLF
929
930 /*
931  * this is what the terminal answers to a ESC-Z or csi0c query.
932  */
933 #define VT100ID "\033[?1;2c"
934 #define VT102ID "\033[?6c"
935
936 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
937                                        8,12,10,14, 9,13,11,15 };
938
939 /* the default colour table, for VGA+ colour systems */
940 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
941     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
942 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
943     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
944 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
945     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
946
947 /*
948  * gotoxy() must verify all boundaries, because the arguments
949  * might also be negative. If the given position is out of
950  * bounds, the cursor is placed at the nearest margin.
951  */
952 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
953 {
954         int min_y, max_y;
955
956         if (new_x < 0)
957                 vc->vc_x = 0;
958         else {
959                 if (new_x >= vc->vc_cols)
960                         vc->vc_x = vc->vc_cols - 1;
961                 else
962                         vc->vc_x = new_x;
963         }
964
965         if (vc->vc_decom) {
966                 min_y = vc->vc_top;
967                 max_y = vc->vc_bottom;
968         } else {
969                 min_y = 0;
970                 max_y = vc->vc_rows;
971         }
972         if (new_y < min_y)
973                 vc->vc_y = min_y;
974         else if (new_y >= max_y)
975                 vc->vc_y = max_y - 1;
976         else
977                 vc->vc_y = new_y;
978         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
979         vc->vc_need_wrap = 0;
980 }
981
982 /* for absolute user moves, when decom is set */
983 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
984 {
985         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
986 }
987
988 void scrollback(struct vc_data *vc, int lines)
989 {
990         if (!lines)
991                 lines = vc->vc_rows / 2;
992         scrolldelta(-lines);
993 }
994
995 void scrollfront(struct vc_data *vc, int lines)
996 {
997         if (!lines)
998                 lines = vc->vc_rows / 2;
999         scrolldelta(lines);
1000 }
1001
1002 static void lf(struct vc_data *vc)
1003 {
1004         /* don't scroll if above bottom of scrolling region, or
1005          * if below scrolling region
1006          */
1007         if (vc->vc_y + 1 == vc->vc_bottom)
1008                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1009         else if (vc->vc_y < vc->vc_rows - 1) {
1010                 vc->vc_y++;
1011                 vc->vc_pos += vc->vc_size_row;
1012         }
1013         vc->vc_need_wrap = 0;
1014 }
1015
1016 static void ri(struct vc_data *vc)
1017 {
1018         /* don't scroll if below top of scrolling region, or
1019          * if above scrolling region
1020          */
1021         if (vc->vc_y == vc->vc_top)
1022                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1023         else if (vc->vc_y > 0) {
1024                 vc->vc_y--;
1025                 vc->vc_pos -= vc->vc_size_row;
1026         }
1027         vc->vc_need_wrap = 0;
1028 }
1029
1030 static inline void cr(struct vc_data *vc)
1031 {
1032         vc->vc_pos -= vc->vc_x << 1;
1033         vc->vc_need_wrap = vc->vc_x = 0;
1034 }
1035
1036 static inline void bs(struct vc_data *vc)
1037 {
1038         if (vc->vc_x) {
1039                 vc->vc_pos -= 2;
1040                 vc->vc_x--;
1041                 vc->vc_need_wrap = 0;
1042         }
1043 }
1044
1045 static inline void del(struct vc_data *vc)
1046 {
1047         /* ignored */
1048 }
1049
1050 static void csi_J(struct vc_data *vc, int vpar)
1051 {
1052         unsigned int count;
1053         unsigned short * start;
1054
1055         switch (vpar) {
1056                 case 0: /* erase from cursor to end of display */
1057                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1058                         start = (unsigned short *)vc->vc_pos;
1059                         if (DO_UPDATE(vc)) {
1060                                 /* do in two stages */
1061                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1062                                               vc->vc_cols - vc->vc_x);
1063                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1064                                               vc->vc_rows - vc->vc_y - 1,
1065                                               vc->vc_cols);
1066                         }
1067                         break;
1068                 case 1: /* erase from start to cursor */
1069                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1070                         start = (unsigned short *)vc->vc_origin;
1071                         if (DO_UPDATE(vc)) {
1072                                 /* do in two stages */
1073                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1074                                               vc->vc_cols);
1075                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1076                                               vc->vc_x + 1);
1077                         }
1078                         break;
1079                 case 2: /* erase whole display */
1080                         count = vc->vc_cols * vc->vc_rows;
1081                         start = (unsigned short *)vc->vc_origin;
1082                         if (DO_UPDATE(vc))
1083                                 vc->vc_sw->con_clear(vc, 0, 0,
1084                                               vc->vc_rows,
1085                                               vc->vc_cols);
1086                         break;
1087                 default:
1088                         return;
1089         }
1090         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1091         vc->vc_need_wrap = 0;
1092 }
1093
1094 static void csi_K(struct vc_data *vc, int vpar)
1095 {
1096         unsigned int count;
1097         unsigned short * start;
1098
1099         switch (vpar) {
1100                 case 0: /* erase from cursor to end of line */
1101                         count = vc->vc_cols - vc->vc_x;
1102                         start = (unsigned short *)vc->vc_pos;
1103                         if (DO_UPDATE(vc))
1104                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1105                                                      vc->vc_cols - vc->vc_x);
1106                         break;
1107                 case 1: /* erase from start of line to cursor */
1108                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1109                         count = vc->vc_x + 1;
1110                         if (DO_UPDATE(vc))
1111                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1112                                                      vc->vc_x + 1);
1113                         break;
1114                 case 2: /* erase whole line */
1115                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1116                         count = vc->vc_cols;
1117                         if (DO_UPDATE(vc))
1118                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1119                                               vc->vc_cols);
1120                         break;
1121                 default:
1122                         return;
1123         }
1124         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1125         vc->vc_need_wrap = 0;
1126 }
1127
1128 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1129 {                                         /* not vt100? */
1130         int count;
1131
1132         if (!vpar)
1133                 vpar++;
1134         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1135
1136         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1137         if (DO_UPDATE(vc))
1138                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1139         vc->vc_need_wrap = 0;
1140 }
1141
1142 static void default_attr(struct vc_data *vc)
1143 {
1144         vc->vc_intensity = 1;
1145         vc->vc_underline = 0;
1146         vc->vc_reverse = 0;
1147         vc->vc_blink = 0;
1148         vc->vc_color = vc->vc_def_color;
1149 }
1150
1151 /* console_sem is held */
1152 static void csi_m(struct vc_data *vc)
1153 {
1154         int i;
1155
1156         for (i = 0; i <= vc->vc_npar; i++)
1157                 switch (vc->vc_par[i]) {
1158                         case 0: /* all attributes off */
1159                                 default_attr(vc);
1160                                 break;
1161                         case 1:
1162                                 vc->vc_intensity = 2;
1163                                 break;
1164                         case 2:
1165                                 vc->vc_intensity = 0;
1166                                 break;
1167                         case 4:
1168                                 vc->vc_underline = 1;
1169                                 break;
1170                         case 5:
1171                                 vc->vc_blink = 1;
1172                                 break;
1173                         case 7:
1174                                 vc->vc_reverse = 1;
1175                                 break;
1176                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1177                                   * Select primary font, don't display
1178                                   * control chars if defined, don't set
1179                                   * bit 8 on output.
1180                                   */
1181                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1182                                                 ? vc->vc_G0_charset
1183                                                 : vc->vc_G1_charset, vc);
1184                                 vc->vc_disp_ctrl = 0;
1185                                 vc->vc_toggle_meta = 0;
1186                                 break;
1187                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1188                                   * Select first alternate font, lets
1189                                   * chars < 32 be displayed as ROM chars.
1190                                   */
1191                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1192                                 vc->vc_disp_ctrl = 1;
1193                                 vc->vc_toggle_meta = 0;
1194                                 break;
1195                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1196                                   * Select second alternate font, toggle
1197                                   * high bit before displaying as ROM char.
1198                                   */
1199                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1200                                 vc->vc_disp_ctrl = 1;
1201                                 vc->vc_toggle_meta = 1;
1202                                 break;
1203                         case 21:
1204                         case 22:
1205                                 vc->vc_intensity = 1;
1206                                 break;
1207                         case 24:
1208                                 vc->vc_underline = 0;
1209                                 break;
1210                         case 25:
1211                                 vc->vc_blink = 0;
1212                                 break;
1213                         case 27:
1214                                 vc->vc_reverse = 0;
1215                                 break;
1216                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1217                                   * Enables underscore, white foreground
1218                                   * with white underscore (Linux - use
1219                                   * default foreground).
1220                                   */
1221                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1222                                 vc->vc_underline = 1;
1223                                 break;
1224                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1225                                   * Disable underline option.
1226                                   * Reset colour to default? It did this
1227                                   * before...
1228                                   */
1229                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1230                                 vc->vc_underline = 0;
1231                                 break;
1232                         case 49:
1233                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1234                                 break;
1235                         default:
1236                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1237                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1238                                                 | (vc->vc_color & 0xf0);
1239                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1240                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1241                                                 | (vc->vc_color & 0x0f);
1242                                 break;
1243                 }
1244         update_attr(vc);
1245 }
1246
1247 static void respond_string(const char *p, struct tty_struct *tty)
1248 {
1249         while (*p) {
1250                 tty_insert_flip_char(tty, *p, 0);
1251                 p++;
1252         }
1253         con_schedule_flip(tty);
1254 }
1255
1256 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1257 {
1258         char buf[40];
1259
1260         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1261         respond_string(buf, tty);
1262 }
1263
1264 static inline void status_report(struct tty_struct *tty)
1265 {
1266         respond_string("\033[0n", tty); /* Terminal ok */
1267 }
1268
1269 static inline void respond_ID(struct tty_struct * tty)
1270 {
1271         respond_string(VT102ID, tty);
1272 }
1273
1274 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1275 {
1276         char buf[8];
1277
1278         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1279                 (char)('!' + mry));
1280         respond_string(buf, tty);
1281 }
1282
1283 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1284 int mouse_reporting(void)
1285 {
1286         return vc_cons[fg_console].d->vc_report_mouse;
1287 }
1288
1289 /* console_sem is held */
1290 static void set_mode(struct vc_data *vc, int on_off)
1291 {
1292         int i;
1293
1294         for (i = 0; i <= vc->vc_npar; i++)
1295                 if (vc->vc_ques) {
1296                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1297                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1298                                 if (on_off)
1299                                         set_kbd(vc, decckm);
1300                                 else
1301                                         clr_kbd(vc, decckm);
1302                                 break;
1303                         case 3: /* 80/132 mode switch unimplemented */
1304                                 vc->vc_deccolm = on_off;
1305 #if 0
1306                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1307                                 /* this alone does not suffice; some user mode
1308                                    utility has to change the hardware regs */
1309 #endif
1310                                 break;
1311                         case 5:                 /* Inverted screen on/off */
1312                                 if (vc->vc_decscnm != on_off) {
1313                                         vc->vc_decscnm = on_off;
1314                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1315                                         update_attr(vc);
1316                                 }
1317                                 break;
1318                         case 6:                 /* Origin relative/absolute */
1319                                 vc->vc_decom = on_off;
1320                                 gotoxay(vc, 0, 0);
1321                                 break;
1322                         case 7:                 /* Autowrap on/off */
1323                                 vc->vc_decawm = on_off;
1324                                 break;
1325                         case 8:                 /* Autorepeat on/off */
1326                                 if (on_off)
1327                                         set_kbd(vc, decarm);
1328                                 else
1329                                         clr_kbd(vc, decarm);
1330                                 break;
1331                         case 9:
1332                                 vc->vc_report_mouse = on_off ? 1 : 0;
1333                                 break;
1334                         case 25:                /* Cursor on/off */
1335                                 vc->vc_deccm = on_off;
1336                                 break;
1337                         case 1000:
1338                                 vc->vc_report_mouse = on_off ? 2 : 0;
1339                                 break;
1340                         }
1341                 } else {
1342                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1343                         case 3:                 /* Monitor (display ctrls) */
1344                                 vc->vc_disp_ctrl = on_off;
1345                                 break;
1346                         case 4:                 /* Insert Mode on/off */
1347                                 vc->vc_decim = on_off;
1348                                 break;
1349                         case 20:                /* Lf, Enter == CrLf/Lf */
1350                                 if (on_off)
1351                                         set_kbd(vc, lnm);
1352                                 else
1353                                         clr_kbd(vc, lnm);
1354                                 break;
1355                         }
1356                 }
1357 }
1358
1359 /* console_sem is held */
1360 static void setterm_command(struct vc_data *vc)
1361 {
1362         switch(vc->vc_par[0]) {
1363                 case 1: /* set color for underline mode */
1364                         if (vc->vc_can_do_color &&
1365                                         vc->vc_par[1] < 16) {
1366                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1367                                 if (vc->vc_underline)
1368                                         update_attr(vc);
1369                         }
1370                         break;
1371                 case 2: /* set color for half intensity mode */
1372                         if (vc->vc_can_do_color &&
1373                                         vc->vc_par[1] < 16) {
1374                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1375                                 if (vc->vc_intensity == 0)
1376                                         update_attr(vc);
1377                         }
1378                         break;
1379                 case 8: /* store colors as defaults */
1380                         vc->vc_def_color = vc->vc_attr;
1381                         if (vc->vc_hi_font_mask == 0x100)
1382                                 vc->vc_def_color >>= 1;
1383                         default_attr(vc);
1384                         update_attr(vc);
1385                         break;
1386                 case 9: /* set blanking interval */
1387                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1388                         poke_blanked_console();
1389                         break;
1390                 case 10: /* set bell frequency in Hz */
1391                         if (vc->vc_npar >= 1)
1392                                 vc->vc_bell_pitch = vc->vc_par[1];
1393                         else
1394                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1395                         break;
1396                 case 11: /* set bell duration in msec */
1397                         if (vc->vc_npar >= 1)
1398                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1399                                         vc->vc_par[1] * HZ / 1000 : 0;
1400                         else
1401                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1402                         break;
1403                 case 12: /* bring specified console to the front */
1404                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1405                                 set_console(vc->vc_par[1] - 1);
1406                         break;
1407                 case 13: /* unblank the screen */
1408                         poke_blanked_console();
1409                         break;
1410                 case 14: /* set vesa powerdown interval */
1411                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1412                         break;
1413                 case 15: /* activate the previous console */
1414                         set_console(last_console);
1415                         break;
1416         }
1417 }
1418
1419 /* console_sem is held */
1420 static void csi_at(struct vc_data *vc, unsigned int nr)
1421 {
1422         if (nr > vc->vc_cols - vc->vc_x)
1423                 nr = vc->vc_cols - vc->vc_x;
1424         else if (!nr)
1425                 nr = 1;
1426         insert_char(vc, nr);
1427 }
1428
1429 /* console_sem is held */
1430 static void csi_L(struct vc_data *vc, unsigned int nr)
1431 {
1432         if (nr > vc->vc_rows - vc->vc_y)
1433                 nr = vc->vc_rows - vc->vc_y;
1434         else if (!nr)
1435                 nr = 1;
1436         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1437         vc->vc_need_wrap = 0;
1438 }
1439
1440 /* console_sem is held */
1441 static void csi_P(struct vc_data *vc, unsigned int nr)
1442 {
1443         if (nr > vc->vc_cols - vc->vc_x)
1444                 nr = vc->vc_cols - vc->vc_x;
1445         else if (!nr)
1446                 nr = 1;
1447         delete_char(vc, nr);
1448 }
1449
1450 /* console_sem is held */
1451 static void csi_M(struct vc_data *vc, unsigned int nr)
1452 {
1453         if (nr > vc->vc_rows - vc->vc_y)
1454                 nr = vc->vc_rows - vc->vc_y;
1455         else if (!nr)
1456                 nr=1;
1457         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1458         vc->vc_need_wrap = 0;
1459 }
1460
1461 /* console_sem is held (except via vc_init->reset_terminal */
1462 static void save_cur(struct vc_data *vc)
1463 {
1464         vc->vc_saved_x          = vc->vc_x;
1465         vc->vc_saved_y          = vc->vc_y;
1466         vc->vc_s_intensity      = vc->vc_intensity;
1467         vc->vc_s_underline      = vc->vc_underline;
1468         vc->vc_s_blink          = vc->vc_blink;
1469         vc->vc_s_reverse        = vc->vc_reverse;
1470         vc->vc_s_charset        = vc->vc_charset;
1471         vc->vc_s_color          = vc->vc_color;
1472         vc->vc_saved_G0         = vc->vc_G0_charset;
1473         vc->vc_saved_G1         = vc->vc_G1_charset;
1474 }
1475
1476 /* console_sem is held */
1477 static void restore_cur(struct vc_data *vc)
1478 {
1479         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1480         vc->vc_intensity        = vc->vc_s_intensity;
1481         vc->vc_underline        = vc->vc_s_underline;
1482         vc->vc_blink            = vc->vc_s_blink;
1483         vc->vc_reverse          = vc->vc_s_reverse;
1484         vc->vc_charset          = vc->vc_s_charset;
1485         vc->vc_color            = vc->vc_s_color;
1486         vc->vc_G0_charset       = vc->vc_saved_G0;
1487         vc->vc_G1_charset       = vc->vc_saved_G1;
1488         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1489         update_attr(vc);
1490         vc->vc_need_wrap = 0;
1491 }
1492
1493 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1494         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1495         ESpalette };
1496
1497 /* console_sem is held (except via vc_init()) */
1498 static void reset_terminal(struct vc_data *vc, int do_clear)
1499 {
1500         vc->vc_top              = 0;
1501         vc->vc_bottom           = vc->vc_rows;
1502         vc->vc_state            = ESnormal;
1503         vc->vc_ques             = 0;
1504         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1505         vc->vc_G0_charset       = LAT1_MAP;
1506         vc->vc_G1_charset       = GRAF_MAP;
1507         vc->vc_charset          = 0;
1508         vc->vc_need_wrap        = 0;
1509         vc->vc_report_mouse     = 0;
1510         vc->vc_utf              = 0;
1511         vc->vc_utf_count        = 0;
1512
1513         vc->vc_disp_ctrl        = 0;
1514         vc->vc_toggle_meta      = 0;
1515
1516         vc->vc_decscnm          = 0;
1517         vc->vc_decom            = 0;
1518         vc->vc_decawm           = 1;
1519         vc->vc_deccm            = 1;
1520         vc->vc_decim            = 0;
1521
1522         set_kbd(vc, decarm);
1523         clr_kbd(vc, decckm);
1524         clr_kbd(vc, kbdapplic);
1525         clr_kbd(vc, lnm);
1526         kbd_table[vc->vc_num].lockstate = 0;
1527         kbd_table[vc->vc_num].slockstate = 0;
1528         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1529         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1530         /* do not do set_leds here because this causes an endless tasklet loop
1531            when the keyboard hasn't been initialized yet */
1532
1533         vc->vc_cursor_type = CUR_DEFAULT;
1534         vc->vc_complement_mask = vc->vc_s_complement_mask;
1535
1536         default_attr(vc);
1537         update_attr(vc);
1538
1539         vc->vc_tab_stop[0]      = 0x01010100;
1540         vc->vc_tab_stop[1]      =
1541         vc->vc_tab_stop[2]      =
1542         vc->vc_tab_stop[3]      =
1543         vc->vc_tab_stop[4]      = 0x01010101;
1544
1545         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1546         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1547
1548         gotoxy(vc, 0, 0);
1549         save_cur(vc);
1550         if (do_clear)
1551             csi_J(vc, 2);
1552 }
1553
1554 /* console_sem is held */
1555 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1556 {
1557         /*
1558          *  Control characters can be used in the _middle_
1559          *  of an escape sequence.
1560          */
1561         switch (c) {
1562         case 0:
1563                 return;
1564         case 7:
1565                 if (vc->vc_bell_duration)
1566                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1567                 return;
1568         case 8:
1569                 bs(vc);
1570                 return;
1571         case 9:
1572                 vc->vc_pos -= (vc->vc_x << 1);
1573                 while (vc->vc_x < vc->vc_cols - 1) {
1574                         vc->vc_x++;
1575                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1576                                 break;
1577                 }
1578                 vc->vc_pos += (vc->vc_x << 1);
1579                 return;
1580         case 10: case 11: case 12:
1581                 lf(vc);
1582                 if (!is_kbd(vc, lnm))
1583                         return;
1584         case 13:
1585                 cr(vc);
1586                 return;
1587         case 14:
1588                 vc->vc_charset = 1;
1589                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1590                 vc->vc_disp_ctrl = 1;
1591                 return;
1592         case 15:
1593                 vc->vc_charset = 0;
1594                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1595                 vc->vc_disp_ctrl = 0;
1596                 return;
1597         case 24: case 26:
1598                 vc->vc_state = ESnormal;
1599                 return;
1600         case 27:
1601                 vc->vc_state = ESesc;
1602                 return;
1603         case 127:
1604                 del(vc);
1605                 return;
1606         case 128+27:
1607                 vc->vc_state = ESsquare;
1608                 return;
1609         }
1610         switch(vc->vc_state) {
1611         case ESesc:
1612                 vc->vc_state = ESnormal;
1613                 switch (c) {
1614                 case '[':
1615                         vc->vc_state = ESsquare;
1616                         return;
1617                 case ']':
1618                         vc->vc_state = ESnonstd;
1619                         return;
1620                 case '%':
1621                         vc->vc_state = ESpercent;
1622                         return;
1623                 case 'E':
1624                         cr(vc);
1625                         lf(vc);
1626                         return;
1627                 case 'M':
1628                         ri(vc);
1629                         return;
1630                 case 'D':
1631                         lf(vc);
1632                         return;
1633                 case 'H':
1634                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1635                         return;
1636                 case 'Z':
1637                         respond_ID(tty);
1638                         return;
1639                 case '7':
1640                         save_cur(vc);
1641                         return;
1642                 case '8':
1643                         restore_cur(vc);
1644                         return;
1645                 case '(':
1646                         vc->vc_state = ESsetG0;
1647                         return;
1648                 case ')':
1649                         vc->vc_state = ESsetG1;
1650                         return;
1651                 case '#':
1652                         vc->vc_state = EShash;
1653                         return;
1654                 case 'c':
1655                         reset_terminal(vc, 1);
1656                         return;
1657                 case '>':  /* Numeric keypad */
1658                         clr_kbd(vc, kbdapplic);
1659                         return;
1660                 case '=':  /* Appl. keypad */
1661                         set_kbd(vc, kbdapplic);
1662                         return;
1663                 }
1664                 return;
1665         case ESnonstd:
1666                 if (c=='P') {   /* palette escape sequence */
1667                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1668                                 vc->vc_par[vc->vc_npar] = 0;
1669                         vc->vc_npar = 0;
1670                         vc->vc_state = ESpalette;
1671                         return;
1672                 } else if (c=='R') {   /* reset palette */
1673                         reset_palette(vc);
1674                         vc->vc_state = ESnormal;
1675                 } else
1676                         vc->vc_state = ESnormal;
1677                 return;
1678         case ESpalette:
1679                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1680                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1681                         if (vc->vc_npar == 7) {
1682                                 int i = vc->vc_par[0] * 3, j = 1;
1683                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1684                                 vc->vc_palette[i++] += vc->vc_par[j++];
1685                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1686                                 vc->vc_palette[i++] += vc->vc_par[j++];
1687                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1688                                 vc->vc_palette[i] += vc->vc_par[j];
1689                                 set_palette(vc);
1690                                 vc->vc_state = ESnormal;
1691                         }
1692                 } else
1693                         vc->vc_state = ESnormal;
1694                 return;
1695         case ESsquare:
1696                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1697                         vc->vc_par[vc->vc_npar] = 0;
1698                 vc->vc_npar = 0;
1699                 vc->vc_state = ESgetpars;
1700                 if (c == '[') { /* Function key */
1701                         vc->vc_state=ESfunckey;
1702                         return;
1703                 }
1704                 vc->vc_ques = (c == '?');
1705                 if (vc->vc_ques)
1706                         return;
1707         case ESgetpars:
1708                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1709                         vc->vc_npar++;
1710                         return;
1711                 } else if (c>='0' && c<='9') {
1712                         vc->vc_par[vc->vc_npar] *= 10;
1713                         vc->vc_par[vc->vc_npar] += c - '0';
1714                         return;
1715                 } else
1716                         vc->vc_state = ESgotpars;
1717         case ESgotpars:
1718                 vc->vc_state = ESnormal;
1719                 switch(c) {
1720                 case 'h':
1721                         set_mode(vc, 1);
1722                         return;
1723                 case 'l':
1724                         set_mode(vc, 0);
1725                         return;
1726                 case 'c':
1727                         if (vc->vc_ques) {
1728                                 if (vc->vc_par[0])
1729                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1730                                 else
1731                                         vc->vc_cursor_type = CUR_DEFAULT;
1732                                 return;
1733                         }
1734                         break;
1735                 case 'm':
1736                         if (vc->vc_ques) {
1737                                 clear_selection();
1738                                 if (vc->vc_par[0])
1739                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1740                                 else
1741                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1742                                 return;
1743                         }
1744                         break;
1745                 case 'n':
1746                         if (!vc->vc_ques) {
1747                                 if (vc->vc_par[0] == 5)
1748                                         status_report(tty);
1749                                 else if (vc->vc_par[0] == 6)
1750                                         cursor_report(vc, tty);
1751                         }
1752                         return;
1753                 }
1754                 if (vc->vc_ques) {
1755                         vc->vc_ques = 0;
1756                         return;
1757                 }
1758                 switch(c) {
1759                 case 'G': case '`':
1760                         if (vc->vc_par[0])
1761                                 vc->vc_par[0]--;
1762                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1763                         return;
1764                 case 'A':
1765                         if (!vc->vc_par[0])
1766                                 vc->vc_par[0]++;
1767                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1768                         return;
1769                 case 'B': case 'e':
1770                         if (!vc->vc_par[0])
1771                                 vc->vc_par[0]++;
1772                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1773                         return;
1774                 case 'C': case 'a':
1775                         if (!vc->vc_par[0])
1776                                 vc->vc_par[0]++;
1777                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1778                         return;
1779                 case 'D':
1780                         if (!vc->vc_par[0])
1781                                 vc->vc_par[0]++;
1782                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1783                         return;
1784                 case 'E':
1785                         if (!vc->vc_par[0])
1786                                 vc->vc_par[0]++;
1787                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1788                         return;
1789                 case 'F':
1790                         if (!vc->vc_par[0])
1791                                 vc->vc_par[0]++;
1792                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1793                         return;
1794                 case 'd':
1795                         if (vc->vc_par[0])
1796                                 vc->vc_par[0]--;
1797                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1798                         return;
1799                 case 'H': case 'f':
1800                         if (vc->vc_par[0])
1801                                 vc->vc_par[0]--;
1802                         if (vc->vc_par[1])
1803                                 vc->vc_par[1]--;
1804                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1805                         return;
1806                 case 'J':
1807                         csi_J(vc, vc->vc_par[0]);
1808                         return;
1809                 case 'K':
1810                         csi_K(vc, vc->vc_par[0]);
1811                         return;
1812                 case 'L':
1813                         csi_L(vc, vc->vc_par[0]);
1814                         return;
1815                 case 'M':
1816                         csi_M(vc, vc->vc_par[0]);
1817                         return;
1818                 case 'P':
1819                         csi_P(vc, vc->vc_par[0]);
1820                         return;
1821                 case 'c':
1822                         if (!vc->vc_par[0])
1823                                 respond_ID(tty);
1824                         return;
1825                 case 'g':
1826                         if (!vc->vc_par[0])
1827                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1828                         else if (vc->vc_par[0] == 3) {
1829                                 vc->vc_tab_stop[0] =
1830                                         vc->vc_tab_stop[1] =
1831                                         vc->vc_tab_stop[2] =
1832                                         vc->vc_tab_stop[3] =
1833                                         vc->vc_tab_stop[4] = 0;
1834                         }
1835                         return;
1836                 case 'm':
1837                         csi_m(vc);
1838                         return;
1839                 case 'q': /* DECLL - but only 3 leds */
1840                         /* map 0,1,2,3 to 0,1,2,4 */
1841                         if (vc->vc_par[0] < 4)
1842                                 setledstate(kbd_table + vc->vc_num,
1843                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1844                         return;
1845                 case 'r':
1846                         if (!vc->vc_par[0])
1847                                 vc->vc_par[0]++;
1848                         if (!vc->vc_par[1])
1849                                 vc->vc_par[1] = vc->vc_rows;
1850                         /* Minimum allowed region is 2 lines */
1851                         if (vc->vc_par[0] < vc->vc_par[1] &&
1852                             vc->vc_par[1] <= vc->vc_rows) {
1853                                 vc->vc_top = vc->vc_par[0] - 1;
1854                                 vc->vc_bottom = vc->vc_par[1];
1855                                 gotoxay(vc, 0, 0);
1856                         }
1857                         return;
1858                 case 's':
1859                         save_cur(vc);
1860                         return;
1861                 case 'u':
1862                         restore_cur(vc);
1863                         return;
1864                 case 'X':
1865                         csi_X(vc, vc->vc_par[0]);
1866                         return;
1867                 case '@':
1868                         csi_at(vc, vc->vc_par[0]);
1869                         return;
1870                 case ']': /* setterm functions */
1871                         setterm_command(vc);
1872                         return;
1873                 }
1874                 return;
1875         case ESpercent:
1876                 vc->vc_state = ESnormal;
1877                 switch (c) {
1878                 case '@':  /* defined in ISO 2022 */
1879                         vc->vc_utf = 0;
1880                         return;
1881                 case 'G':  /* prelim official escape code */
1882                 case '8':  /* retained for compatibility */
1883                         vc->vc_utf = 1;
1884                         return;
1885                 }
1886                 return;
1887         case ESfunckey:
1888                 vc->vc_state = ESnormal;
1889                 return;
1890         case EShash:
1891                 vc->vc_state = ESnormal;
1892                 if (c == '8') {
1893                         /* DEC screen alignment test. kludge :-) */
1894                         vc->vc_video_erase_char =
1895                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1896                         csi_J(vc, 2);
1897                         vc->vc_video_erase_char =
1898                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1899                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1900                 }
1901                 return;
1902         case ESsetG0:
1903                 if (c == '0')
1904                         vc->vc_G0_charset = GRAF_MAP;
1905                 else if (c == 'B')
1906                         vc->vc_G0_charset = LAT1_MAP;
1907                 else if (c == 'U')
1908                         vc->vc_G0_charset = IBMPC_MAP;
1909                 else if (c == 'K')
1910                         vc->vc_G0_charset = USER_MAP;
1911                 if (vc->vc_charset == 0)
1912                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1913                 vc->vc_state = ESnormal;
1914                 return;
1915         case ESsetG1:
1916                 if (c == '0')
1917                         vc->vc_G1_charset = GRAF_MAP;
1918                 else if (c == 'B')
1919                         vc->vc_G1_charset = LAT1_MAP;
1920                 else if (c == 'U')
1921                         vc->vc_G1_charset = IBMPC_MAP;
1922                 else if (c == 'K')
1923                         vc->vc_G1_charset = USER_MAP;
1924                 if (vc->vc_charset == 1)
1925                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1926                 vc->vc_state = ESnormal;
1927                 return;
1928         default:
1929                 vc->vc_state = ESnormal;
1930         }
1931 }
1932
1933 /* This is a temporary buffer used to prepare a tty console write
1934  * so that we can easily avoid touching user space while holding the
1935  * console spinlock.  It is allocated in con_init and is shared by
1936  * this code and the vc_screen read/write tty calls.
1937  *
1938  * We have to allocate this statically in the kernel data section
1939  * since console_init (and thus con_init) are called before any
1940  * kernel memory allocation is available.
1941  */
1942 char con_buf[CON_BUF_SIZE];
1943 DECLARE_MUTEX(con_buf_sem);
1944
1945 /* acquires console_sem */
1946 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1947 {
1948 #ifdef VT_BUF_VRAM_ONLY
1949 #define FLUSH do { } while(0);
1950 #else
1951 #define FLUSH if (draw_x >= 0) { \
1952         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1953         draw_x = -1; \
1954         }
1955 #endif
1956
1957         int c, tc, ok, n = 0, draw_x = -1;
1958         unsigned int currcons;
1959         unsigned long draw_from = 0, draw_to = 0;
1960         struct vc_data *vc;
1961         u16 himask, charmask;
1962         const unsigned char *orig_buf = NULL;
1963         int orig_count;
1964
1965         if (in_interrupt())
1966                 return count;
1967
1968         might_sleep();
1969
1970         acquire_console_sem();
1971         vc = tty->driver_data;
1972         if (vc == NULL) {
1973                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1974                 release_console_sem();
1975                 return 0;
1976         }
1977
1978         currcons = vc->vc_num;
1979         if (!vc_cons_allocated(currcons)) {
1980             /* could this happen? */
1981             static int error = 0;
1982             if (!error) {
1983                 error = 1;
1984                 printk("con_write: tty %d not allocated\n", currcons+1);
1985             }
1986             release_console_sem();
1987             return 0;
1988         }
1989         release_console_sem();
1990
1991         orig_buf = buf;
1992         orig_count = count;
1993
1994         /* At this point 'buf' is guaranteed to be a kernel buffer
1995          * and therefore no access to userspace (and therefore sleeping)
1996          * will be needed.  The con_buf_sem serializes all tty based
1997          * console rendering and vcs write/read operations.  We hold
1998          * the console spinlock during the entire write.
1999          */
2000
2001         acquire_console_sem();
2002
2003         vc = tty->driver_data;
2004         if (vc == NULL) {
2005                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2006                 release_console_sem();
2007                 goto out;
2008         }
2009
2010         himask = vc->vc_hi_font_mask;
2011         charmask = himask ? 0x1ff : 0xff;
2012
2013         /* undraw cursor first */
2014         if (IS_FG(vc))
2015                 hide_cursor(vc);
2016
2017         while (!tty->stopped && count) {
2018                 int orig = *buf;
2019                 c = orig;
2020                 buf++;
2021                 n++;
2022                 count--;
2023
2024                 /* Do no translation at all in control states */
2025                 if (vc->vc_state != ESnormal) {
2026                         tc = c;
2027                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2028                     /* Combine UTF-8 into Unicode */
2029                     /* Malformed sequences as sequences of replacement glyphs */
2030 rescan_last_byte:
2031                     if(c > 0x7f) {
2032                         if (vc->vc_utf_count) {
2033                                if ((c & 0xc0) == 0x80) {
2034                                        vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2035                                        if (--vc->vc_utf_count) {
2036                                                vc->vc_npar++;
2037                                                continue;
2038                                        }
2039                                        tc = c = vc->vc_utf_char;
2040                                } else
2041                                        goto replacement_glyph;
2042                         } else {
2043                                 vc->vc_npar = 0;
2044                                 if ((c & 0xe0) == 0xc0) {
2045                                     vc->vc_utf_count = 1;
2046                                     vc->vc_utf_char = (c & 0x1f);
2047                                 } else if ((c & 0xf0) == 0xe0) {
2048                                     vc->vc_utf_count = 2;
2049                                     vc->vc_utf_char = (c & 0x0f);
2050                                 } else if ((c & 0xf8) == 0xf0) {
2051                                     vc->vc_utf_count = 3;
2052                                     vc->vc_utf_char = (c & 0x07);
2053                                 } else if ((c & 0xfc) == 0xf8) {
2054                                     vc->vc_utf_count = 4;
2055                                     vc->vc_utf_char = (c & 0x03);
2056                                 } else if ((c & 0xfe) == 0xfc) {
2057                                     vc->vc_utf_count = 5;
2058                                     vc->vc_utf_char = (c & 0x01);
2059                                 } else
2060                                     goto replacement_glyph;
2061                                 continue;
2062                               }
2063                     } else {
2064                       if (vc->vc_utf_count)
2065                               goto replacement_glyph;
2066                       tc = c;
2067                     }
2068                 } else {        /* no utf or alternate charset mode */
2069                   tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2070                 }
2071
2072                 /* If the original code was a control character we
2073                  * only allow a glyph to be displayed if the code is
2074                  * not normally used (such as for cursor movement) or
2075                  * if the disp_ctrl mode has been explicitly enabled.
2076                  * Certain characters (as given by the CTRL_ALWAYS
2077                  * bitmap) are always displayed as control characters,
2078                  * as the console would be pretty useless without
2079                  * them; to display an arbitrary font position use the
2080                  * direct-to-font zone in UTF-8 mode.
2081                  */
2082                 ok = tc && (c >= 32 ||
2083                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2084                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2085                         && (c != 127 || vc->vc_disp_ctrl)
2086                         && (c != 128+27);
2087
2088                 if (vc->vc_state == ESnormal && ok) {
2089                         /* Now try to find out how to display it */
2090                         tc = conv_uni_to_pc(vc, tc);
2091                         if (tc & ~charmask) {
2092                                 if ( tc == -4 ) {
2093                                 /* If we got -4 (not found) then see if we have
2094                                    defined a replacement character (U+FFFD) */
2095 replacement_glyph:
2096                                         tc = conv_uni_to_pc(vc, 0xfffd);
2097                                         if (!(tc & ~charmask))
2098                                                 goto display_glyph;
2099                                 } else if ( tc != -3 )
2100                                         continue; /* nothing to display */
2101                                 /* no hash table or no replacement --
2102                                  * hope for the best */
2103                                 if ( c & ~charmask )
2104                                         tc = '?';
2105                                 else
2106                                         tc = c;
2107                         }
2108
2109 display_glyph:
2110                         if (vc->vc_need_wrap || vc->vc_decim)
2111                                 FLUSH
2112                         if (vc->vc_need_wrap) {
2113                                 cr(vc);
2114                                 lf(vc);
2115                         }
2116                         if (vc->vc_decim)
2117                                 insert_char(vc, 1);
2118                         scr_writew(himask ?
2119                                      ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2120                                      (vc->vc_attr << 8) + tc,
2121                                    (u16 *) vc->vc_pos);
2122                         if (DO_UPDATE(vc) && draw_x < 0) {
2123                                 draw_x = vc->vc_x;
2124                                 draw_from = vc->vc_pos;
2125                         }
2126                         if (vc->vc_x == vc->vc_cols - 1) {
2127                                 vc->vc_need_wrap = vc->vc_decawm;
2128                                 draw_to = vc->vc_pos + 2;
2129                         } else {
2130                                 vc->vc_x++;
2131                                 draw_to = (vc->vc_pos += 2);
2132                         }
2133                         if (vc->vc_utf_count) {
2134                                 if (vc->vc_npar) {
2135                                         vc->vc_npar--;
2136                                         goto display_glyph;
2137                                 }
2138                                 vc->vc_utf_count = 0;
2139                                 c = orig;
2140                                 goto rescan_last_byte;
2141                         }
2142                         continue;
2143                 }
2144                 FLUSH
2145                 do_con_trol(tty, vc, orig);
2146         }
2147         FLUSH
2148         console_conditional_schedule();
2149         release_console_sem();
2150
2151 out:
2152         return n;
2153 #undef FLUSH
2154 }
2155
2156 /*
2157  * This is the console switching callback.
2158  *
2159  * Doing console switching in a process context allows
2160  * us to do the switches asynchronously (needed when we want
2161  * to switch due to a keyboard interrupt).  Synchronization
2162  * with other console code and prevention of re-entrancy is
2163  * ensured with console_sem.
2164  */
2165 static void console_callback(void *ignored)
2166 {
2167         acquire_console_sem();
2168
2169         if (want_console >= 0) {
2170                 if (want_console != fg_console &&
2171                     vc_cons_allocated(want_console)) {
2172                         hide_cursor(vc_cons[fg_console].d);
2173                         change_console(vc_cons[want_console].d);
2174                         /* we only changed when the console had already
2175                            been allocated - a new console is not created
2176                            in an interrupt routine */
2177                 }
2178                 want_console = -1;
2179         }
2180         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2181                 do_poke_blanked_console = 0;
2182                 poke_blanked_console();
2183         }
2184         if (scrollback_delta) {
2185                 struct vc_data *vc = vc_cons[fg_console].d;
2186                 clear_selection();
2187                 if (vc->vc_mode == KD_TEXT)
2188                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2189                 scrollback_delta = 0;
2190         }
2191         if (blank_timer_expired) {
2192                 do_blank_screen(0);
2193                 blank_timer_expired = 0;
2194         }
2195
2196         release_console_sem();
2197 }
2198
2199 void set_console(int nr)
2200 {
2201         want_console = nr;
2202         schedule_console_callback();
2203 }
2204
2205 struct tty_driver *console_driver;
2206
2207 #ifdef CONFIG_VT_CONSOLE
2208
2209 /*
2210  *      Console on virtual terminal
2211  *
2212  * The console must be locked when we get here.
2213  */
2214
2215 static void vt_console_print(struct console *co, const char *b, unsigned count)
2216 {
2217         struct vc_data *vc = vc_cons[fg_console].d;
2218         unsigned char c;
2219         static unsigned long printing;
2220         const ushort *start;
2221         ushort cnt = 0;
2222         ushort myx;
2223
2224         /* console busy or not yet initialized */
2225         if (!printable || test_and_set_bit(0, &printing))
2226                 return;
2227
2228         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2229                 vc = vc_cons[kmsg_redirect - 1].d;
2230
2231         /* read `x' only after setting currcons properly (otherwise
2232            the `x' macro will read the x of the foreground console). */
2233         myx = vc->vc_x;
2234
2235         if (!vc_cons_allocated(fg_console)) {
2236                 /* impossible */
2237                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2238                 goto quit;
2239         }
2240
2241         if (vc->vc_mode != KD_TEXT)
2242                 goto quit;
2243
2244         /* undraw cursor first */
2245         if (IS_FG(vc))
2246                 hide_cursor(vc);
2247
2248         start = (ushort *)vc->vc_pos;
2249
2250         /* Contrived structure to try to emulate original need_wrap behaviour
2251          * Problems caused when we have need_wrap set on '\n' character */
2252         while (count--) {
2253                 c = *b++;
2254                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2255                         if (cnt > 0) {
2256                                 if (CON_IS_VISIBLE(vc))
2257                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2258                                 vc->vc_x += cnt;
2259                                 if (vc->vc_need_wrap)
2260                                         vc->vc_x--;
2261                                 cnt = 0;
2262                         }
2263                         if (c == 8) {           /* backspace */
2264                                 bs(vc);
2265                                 start = (ushort *)vc->vc_pos;
2266                                 myx = vc->vc_x;
2267                                 continue;
2268                         }
2269                         if (c != 13)
2270                                 lf(vc);
2271                         cr(vc);
2272                         start = (ushort *)vc->vc_pos;
2273                         myx = vc->vc_x;
2274                         if (c == 10 || c == 13)
2275                                 continue;
2276                 }
2277                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2278                 cnt++;
2279                 if (myx == vc->vc_cols - 1) {
2280                         vc->vc_need_wrap = 1;
2281                         continue;
2282                 }
2283                 vc->vc_pos += 2;
2284                 myx++;
2285         }
2286         if (cnt > 0) {
2287                 if (CON_IS_VISIBLE(vc))
2288                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2289                 vc->vc_x += cnt;
2290                 if (vc->vc_x == vc->vc_cols) {
2291                         vc->vc_x--;
2292                         vc->vc_need_wrap = 1;
2293                 }
2294         }
2295         set_cursor(vc);
2296
2297 quit:
2298         clear_bit(0, &printing);
2299 }
2300
2301 static struct tty_driver *vt_console_device(struct console *c, int *index)
2302 {
2303         *index = c->index ? c->index-1 : fg_console;
2304         return console_driver;
2305 }
2306
2307 static struct console vt_console_driver = {
2308         .name           = "tty",
2309         .write          = vt_console_print,
2310         .device         = vt_console_device,
2311         .unblank        = unblank_screen,
2312         .flags          = CON_PRINTBUFFER,
2313         .index          = -1,
2314 };
2315 #endif
2316
2317 /*
2318  *      Handling of Linux-specific VC ioctls
2319  */
2320
2321 /*
2322  * Generally a bit racy with respect to console_sem().
2323  *
2324  * There are some functions which don't need it.
2325  *
2326  * There are some functions which can sleep for arbitrary periods
2327  * (paste_selection) but we don't need the lock there anyway.
2328  *
2329  * set_selection has locking, and definitely needs it
2330  */
2331
2332 int tioclinux(struct tty_struct *tty, unsigned long arg)
2333 {
2334         char type, data;
2335         char __user *p = (char __user *)arg;
2336         int lines;
2337         int ret;
2338
2339         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2340                 return -EINVAL;
2341         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2342                 return -EPERM;
2343         if (get_user(type, p))
2344                 return -EFAULT;
2345         ret = 0;
2346         switch (type)
2347         {
2348                 case TIOCL_SETSEL:
2349                         acquire_console_sem();
2350                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2351                         release_console_sem();
2352                         break;
2353                 case TIOCL_PASTESEL:
2354                         ret = paste_selection(tty);
2355                         break;
2356                 case TIOCL_UNBLANKSCREEN:
2357                         acquire_console_sem();
2358                         unblank_screen();
2359                         release_console_sem();
2360                         break;
2361                 case TIOCL_SELLOADLUT:
2362                         ret = sel_loadlut(p);
2363                         break;
2364                 case TIOCL_GETSHIFTSTATE:
2365                         
2366         /*
2367          * Make it possible to react to Shift+Mousebutton.
2368          * Note that 'shift_state' is an undocumented
2369          * kernel-internal variable; programs not closely
2370          * related to the kernel should not use this.
2371          */
2372                         data = shift_state;
2373                         ret = __put_user(data, p);
2374                         break;
2375                 case TIOCL_GETMOUSEREPORTING:
2376                         data = mouse_reporting();
2377                         ret = __put_user(data, p);
2378                         break;
2379                 case TIOCL_SETVESABLANK:
2380                         set_vesa_blanking(p);
2381                         break;
2382                 case TIOCL_GETKMSGREDIRECT:
2383                         data = kmsg_redirect;
2384                         ret = __put_user(data, p);
2385                         break;
2386                 case TIOCL_SETKMSGREDIRECT:
2387                         if (!capable(CAP_SYS_ADMIN)) {
2388                                 ret = -EPERM;
2389                         } else {
2390                                 if (get_user(data, p+1))
2391                                         ret = -EFAULT;
2392                                 else
2393                                         kmsg_redirect = data;
2394                         }
2395                         break;
2396                 case TIOCL_GETFGCONSOLE:
2397                         ret = fg_console;
2398                         break;
2399                 case TIOCL_SCROLLCONSOLE:
2400                         if (get_user(lines, (s32 __user *)(p+4))) {
2401                                 ret = -EFAULT;
2402                         } else {
2403                                 scrollfront(vc_cons[fg_console].d, lines);
2404                                 ret = 0;
2405                         }
2406                         break;
2407                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2408                         acquire_console_sem();
2409                         ignore_poke = 1;
2410                         do_blank_screen(0);
2411                         release_console_sem();
2412                         break;
2413                 case TIOCL_BLANKEDSCREEN:
2414                         ret = console_blanked;
2415                         break;
2416                 default:
2417                         ret = -EINVAL;
2418                         break;
2419         }
2420         return ret;
2421 }
2422
2423 /*
2424  * /dev/ttyN handling
2425  */
2426
2427 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2428 {
2429         int     retval;
2430
2431         retval = do_con_write(tty, buf, count);
2432         con_flush_chars(tty);
2433
2434         return retval;
2435 }
2436
2437 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2438 {
2439         if (in_interrupt())
2440                 return; /* n_r3964 calls put_char() from interrupt context */
2441         do_con_write(tty, &ch, 1);
2442 }
2443
2444 static int con_write_room(struct tty_struct *tty)
2445 {
2446         if (tty->stopped)
2447                 return 0;
2448         return 4096;            /* No limit, really; we're not buffering */
2449 }
2450
2451 static int con_chars_in_buffer(struct tty_struct *tty)
2452 {
2453         return 0;               /* we're not buffering */
2454 }
2455
2456 /*
2457  * con_throttle and con_unthrottle are only used for
2458  * paste_selection(), which has to stuff in a large number of
2459  * characters...
2460  */
2461 static void con_throttle(struct tty_struct *tty)
2462 {
2463 }
2464
2465 static void con_unthrottle(struct tty_struct *tty)
2466 {
2467         struct vc_data *vc = tty->driver_data;
2468
2469         wake_up_interruptible(&vc->paste_wait);
2470 }
2471
2472 /*
2473  * Turn the Scroll-Lock LED on when the tty is stopped
2474  */
2475 static void con_stop(struct tty_struct *tty)
2476 {
2477         int console_num;
2478         if (!tty)
2479                 return;
2480         console_num = tty->index;
2481         if (!vc_cons_allocated(console_num))
2482                 return;
2483         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2484         set_leds();
2485 }
2486
2487 /*
2488  * Turn the Scroll-Lock LED off when the console is started
2489  */
2490 static void con_start(struct tty_struct *tty)
2491 {
2492         int console_num;
2493         if (!tty)
2494                 return;
2495         console_num = tty->index;
2496         if (!vc_cons_allocated(console_num))
2497                 return;
2498         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2499         set_leds();
2500 }
2501
2502 static void con_flush_chars(struct tty_struct *tty)
2503 {
2504         struct vc_data *vc;
2505
2506         if (in_interrupt())     /* from flush_to_ldisc */
2507                 return;
2508
2509         /* if we race with con_close(), vt may be null */
2510         acquire_console_sem();
2511         vc = tty->driver_data;
2512         if (vc)
2513                 set_cursor(vc);
2514         release_console_sem();
2515 }
2516
2517 /*
2518  * Allocate the console screen memory.
2519  */
2520 static int con_open(struct tty_struct *tty, struct file *filp)
2521 {
2522         unsigned int currcons = tty->index;
2523         int ret = 0;
2524
2525         acquire_console_sem();
2526         if (tty->driver_data == NULL) {
2527                 ret = vc_allocate(currcons);
2528                 if (ret == 0) {
2529                         struct vc_data *vc = vc_cons[currcons].d;
2530                         tty->driver_data = vc;
2531                         vc->vc_tty = tty;
2532
2533                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2534                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2535                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2536                         }
2537                         release_console_sem();
2538                         vcs_make_sysfs(tty);
2539                         return ret;
2540                 }
2541         }
2542         release_console_sem();
2543         return ret;
2544 }
2545
2546 /*
2547  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2548  * and taking a ref against the tty while we're in the process of forgetting
2549  * about it and cleaning things up.
2550  *
2551  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2552  */
2553 static void con_close(struct tty_struct *tty, struct file *filp)
2554 {
2555         mutex_lock(&tty_mutex);
2556         acquire_console_sem();
2557         if (tty && tty->count == 1) {
2558                 struct vc_data *vc = tty->driver_data;
2559
2560                 if (vc)
2561                         vc->vc_tty = NULL;
2562                 tty->driver_data = NULL;
2563                 release_console_sem();
2564                 vcs_remove_sysfs(tty);
2565                 mutex_unlock(&tty_mutex);
2566                 /*
2567                  * tty_mutex is released, but we still hold BKL, so there is
2568                  * still exclusion against init_dev()
2569                  */
2570                 return;
2571         }
2572         release_console_sem();
2573         mutex_unlock(&tty_mutex);
2574 }
2575
2576 static void vc_init(struct vc_data *vc, unsigned int rows,
2577                     unsigned int cols, int do_clear)
2578 {
2579         int j, k ;
2580
2581         vc->vc_cols = cols;
2582         vc->vc_rows = rows;
2583         vc->vc_size_row = cols << 1;
2584         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2585
2586         set_origin(vc);
2587         vc->vc_pos = vc->vc_origin;
2588         reset_vc(vc);
2589         for (j=k=0; j<16; j++) {
2590                 vc->vc_palette[k++] = default_red[j] ;
2591                 vc->vc_palette[k++] = default_grn[j] ;
2592                 vc->vc_palette[k++] = default_blu[j] ;
2593         }
2594         vc->vc_def_color       = 0x07;   /* white */
2595         vc->vc_ulcolor          = 0x0f;   /* bold white */
2596         vc->vc_halfcolor       = 0x08;   /* grey */
2597         init_waitqueue_head(&vc->paste_wait);
2598         reset_terminal(vc, do_clear);
2599 }
2600
2601 /*
2602  * This routine initializes console interrupts, and does nothing
2603  * else. If you want the screen to clear, call tty_write with
2604  * the appropriate escape-sequence.
2605  */
2606
2607 static int __init con_init(void)
2608 {
2609         const char *display_desc = NULL;
2610         struct vc_data *vc;
2611         unsigned int currcons = 0, i;
2612
2613         acquire_console_sem();
2614
2615         if (conswitchp)
2616                 display_desc = conswitchp->con_startup();
2617         if (!display_desc) {
2618                 fg_console = 0;
2619                 release_console_sem();
2620                 return 0;
2621         }
2622
2623         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2624                 struct con_driver *con_driver = &registered_con_driver[i];
2625
2626                 if (con_driver->con == NULL) {
2627                         con_driver->con = conswitchp;
2628                         con_driver->desc = display_desc;
2629                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2630                         con_driver->first = 0;
2631                         con_driver->last = MAX_NR_CONSOLES - 1;
2632                         break;
2633                 }
2634         }
2635
2636         for (i = 0; i < MAX_NR_CONSOLES; i++)
2637                 con_driver_map[i] = conswitchp;
2638
2639         init_timer(&console_timer);
2640         console_timer.function = blank_screen_t;
2641         if (blankinterval) {
2642                 blank_state = blank_normal_wait;
2643                 mod_timer(&console_timer, jiffies + blankinterval);
2644         }
2645
2646         /*
2647          * kmalloc is not running yet - we use the bootmem allocator.
2648          */
2649         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2650                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2651                 visual_init(vc, currcons, 1);
2652                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2653                 vc->vc_kmalloced = 0;
2654                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2655                         currcons || !vc->vc_sw->con_save_screen);
2656         }
2657         currcons = fg_console = 0;
2658         master_display_fg = vc = vc_cons[currcons].d;
2659         set_origin(vc);
2660         save_screen(vc);
2661         gotoxy(vc, vc->vc_x, vc->vc_y);
2662         csi_J(vc, 0);
2663         update_screen(vc);
2664         printk("Console: %s %s %dx%d",
2665                 vc->vc_can_do_color ? "colour" : "mono",
2666                 display_desc, vc->vc_cols, vc->vc_rows);
2667         printable = 1;
2668         printk("\n");
2669
2670         release_console_sem();
2671
2672 #ifdef CONFIG_VT_CONSOLE
2673         register_console(&vt_console_driver);
2674 #endif
2675         return 0;
2676 }
2677 console_initcall(con_init);
2678
2679 static const struct tty_operations con_ops = {
2680         .open = con_open,
2681         .close = con_close,
2682         .write = con_write,
2683         .write_room = con_write_room,
2684         .put_char = con_put_char,
2685         .flush_chars = con_flush_chars,
2686         .chars_in_buffer = con_chars_in_buffer,
2687         .ioctl = vt_ioctl,
2688         .stop = con_stop,
2689         .start = con_start,
2690         .throttle = con_throttle,
2691         .unthrottle = con_unthrottle,
2692 };
2693
2694 int __init vty_init(void)
2695 {
2696         vcs_init();
2697
2698         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2699         if (!console_driver)
2700                 panic("Couldn't allocate console driver\n");
2701         console_driver->owner = THIS_MODULE;
2702         console_driver->name = "tty";
2703         console_driver->name_base = 1;
2704         console_driver->major = TTY_MAJOR;
2705         console_driver->minor_start = 1;
2706         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2707         console_driver->init_termios = tty_std_termios;
2708         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2709         tty_set_operations(console_driver, &con_ops);
2710         if (tty_register_driver(console_driver))
2711                 panic("Couldn't register console driver\n");
2712
2713         kbd_init();
2714         console_map_init();
2715 #ifdef CONFIG_PROM_CONSOLE
2716         prom_con_init();
2717 #endif
2718 #ifdef CONFIG_MDA_CONSOLE
2719         mda_console_init();
2720 #endif
2721         return 0;
2722 }
2723
2724 #ifndef VT_SINGLE_DRIVER
2725 #include <linux/device.h>
2726
2727 static struct class *vtconsole_class;
2728
2729 static int bind_con_driver(const struct consw *csw, int first, int last,
2730                            int deflt)
2731 {
2732         struct module *owner = csw->owner;
2733         const char *desc = NULL;
2734         struct con_driver *con_driver;
2735         int i, j = -1, k = -1, retval = -ENODEV;
2736
2737         if (!try_module_get(owner))
2738                 return -ENODEV;
2739
2740         acquire_console_sem();
2741
2742         /* check if driver is registered */
2743         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2744                 con_driver = &registered_con_driver[i];
2745
2746                 if (con_driver->con == csw) {
2747                         desc = con_driver->desc;
2748                         retval = 0;
2749                         break;
2750                 }
2751         }
2752
2753         if (retval)
2754                 goto err;
2755
2756         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2757                 csw->con_startup();
2758                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2759         }
2760
2761         if (deflt) {
2762                 if (conswitchp)
2763                         module_put(conswitchp->owner);
2764
2765                 __module_get(owner);
2766                 conswitchp = csw;
2767         }
2768
2769         first = max(first, con_driver->first);
2770         last = min(last, con_driver->last);
2771
2772         for (i = first; i <= last; i++) {
2773                 int old_was_color;
2774                 struct vc_data *vc = vc_cons[i].d;
2775
2776                 if (con_driver_map[i])
2777                         module_put(con_driver_map[i]->owner);
2778                 __module_get(owner);
2779                 con_driver_map[i] = csw;
2780
2781                 if (!vc || !vc->vc_sw)
2782                         continue;
2783
2784                 j = i;
2785
2786                 if (CON_IS_VISIBLE(vc)) {
2787                         k = i;
2788                         save_screen(vc);
2789                 }
2790
2791                 old_was_color = vc->vc_can_do_color;
2792                 vc->vc_sw->con_deinit(vc);
2793                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2794                 visual_init(vc, i, 0);
2795                 set_origin(vc);
2796                 update_attr(vc);
2797
2798                 /* If the console changed between mono <-> color, then
2799                  * the attributes in the screenbuf will be wrong.  The
2800                  * following resets all attributes to something sane.
2801                  */
2802                 if (old_was_color != vc->vc_can_do_color)
2803                         clear_buffer_attributes(vc);
2804         }
2805
2806         printk("Console: switching ");
2807         if (!deflt)
2808                 printk("consoles %d-%d ", first+1, last+1);
2809         if (j >= 0) {
2810                 struct vc_data *vc = vc_cons[j].d;
2811
2812                 printk("to %s %s %dx%d\n",
2813                        vc->vc_can_do_color ? "colour" : "mono",
2814                        desc, vc->vc_cols, vc->vc_rows);
2815
2816                 if (k >= 0) {
2817                         vc = vc_cons[k].d;
2818                         update_screen(vc);
2819                 }
2820         } else
2821                 printk("to %s\n", desc);
2822
2823         retval = 0;
2824 err:
2825         release_console_sem();
2826         module_put(owner);
2827         return retval;
2828 };
2829
2830 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2831 static int con_is_graphics(const struct consw *csw, int first, int last)
2832 {
2833         int i, retval = 0;
2834
2835         for (i = first; i <= last; i++) {
2836                 struct vc_data *vc = vc_cons[i].d;
2837
2838                 if (vc && vc->vc_mode == KD_GRAPHICS) {
2839                         retval = 1;
2840                         break;
2841                 }
2842         }
2843
2844         return retval;
2845 }
2846
2847 static int unbind_con_driver(const struct consw *csw, int first, int last,
2848                              int deflt)
2849 {
2850         struct module *owner = csw->owner;
2851         const struct consw *defcsw = NULL;
2852         struct con_driver *con_driver = NULL, *con_back = NULL;
2853         int i, retval = -ENODEV;
2854
2855         if (!try_module_get(owner))
2856                 return -ENODEV;
2857
2858         acquire_console_sem();
2859
2860         /* check if driver is registered and if it is unbindable */
2861         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2862                 con_driver = &registered_con_driver[i];
2863
2864                 if (con_driver->con == csw &&
2865                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
2866                         retval = 0;
2867                         break;
2868                 }
2869         }
2870
2871         if (retval) {
2872                 release_console_sem();
2873                 goto err;
2874         }
2875
2876         retval = -ENODEV;
2877
2878         /* check if backup driver exists */
2879         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2880                 con_back = &registered_con_driver[i];
2881
2882                 if (con_back->con &&
2883                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
2884                         defcsw = con_back->con;
2885                         retval = 0;
2886                         break;
2887                 }
2888         }
2889
2890         if (retval) {
2891                 release_console_sem();
2892                 goto err;
2893         }
2894
2895         if (!con_is_bound(csw)) {
2896                 release_console_sem();
2897                 goto err;
2898         }
2899
2900         first = max(first, con_driver->first);
2901         last = min(last, con_driver->last);
2902
2903         for (i = first; i <= last; i++) {
2904                 if (con_driver_map[i] == csw) {
2905                         module_put(csw->owner);
2906                         con_driver_map[i] = NULL;
2907                 }
2908         }
2909
2910         if (!con_is_bound(defcsw)) {
2911                 const struct consw *defconsw = conswitchp;
2912
2913                 defcsw->con_startup();
2914                 con_back->flag |= CON_DRIVER_FLAG_INIT;
2915                 /*
2916                  * vgacon may change the default driver to point
2917                  * to dummycon, we restore it here...
2918                  */
2919                 conswitchp = defconsw;
2920         }
2921
2922         if (!con_is_bound(csw))
2923                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
2924
2925         release_console_sem();
2926         /* ignore return value, binding should not fail */
2927         bind_con_driver(defcsw, first, last, deflt);
2928 err:
2929         module_put(owner);
2930         return retval;
2931
2932 }
2933
2934 static int vt_bind(struct con_driver *con)
2935 {
2936         const struct consw *defcsw = NULL, *csw = NULL;
2937         int i, more = 1, first = -1, last = -1, deflt = 0;
2938
2939         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2940             con_is_graphics(con->con, con->first, con->last))
2941                 goto err;
2942
2943         csw = con->con;
2944
2945         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2946                 struct con_driver *con = &registered_con_driver[i];
2947
2948                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
2949                         defcsw = con->con;
2950                         break;
2951                 }
2952         }
2953
2954         if (!defcsw)
2955                 goto err;
2956
2957         while (more) {
2958                 more = 0;
2959
2960                 for (i = con->first; i <= con->last; i++) {
2961                         if (con_driver_map[i] == defcsw) {
2962                                 if (first == -1)
2963                                         first = i;
2964                                 last = i;
2965                                 more = 1;
2966                         } else if (first != -1)
2967                                 break;
2968                 }
2969
2970                 if (first == 0 && last == MAX_NR_CONSOLES -1)
2971                         deflt = 1;
2972
2973                 if (first != -1)
2974                         bind_con_driver(csw, first, last, deflt);
2975
2976                 first = -1;
2977                 last = -1;
2978                 deflt = 0;
2979         }
2980
2981 err:
2982         return 0;
2983 }
2984
2985 static int vt_unbind(struct con_driver *con)
2986 {
2987         const struct consw *csw = NULL;
2988         int i, more = 1, first = -1, last = -1, deflt = 0;
2989
2990         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2991             con_is_graphics(con->con, con->first, con->last))
2992                 goto err;
2993
2994         csw = con->con;
2995
2996         while (more) {
2997                 more = 0;
2998
2999                 for (i = con->first; i <= con->last; i++) {
3000                         if (con_driver_map[i] == csw) {
3001                                 if (first == -1)
3002                                         first = i;
3003                                 last = i;
3004                                 more = 1;
3005                         } else if (first != -1)
3006                                 break;
3007                 }
3008
3009                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3010                         deflt = 1;
3011
3012                 if (first != -1)
3013                         unbind_con_driver(csw, first, last, deflt);
3014
3015                 first = -1;
3016                 last = -1;
3017                 deflt = 0;
3018         }
3019
3020 err:
3021         return 0;
3022 }
3023 #else
3024 static inline int vt_bind(struct con_driver *con)
3025 {
3026         return 0;
3027 }
3028 static inline int vt_unbind(struct con_driver *con)
3029 {
3030         return 0;
3031 }
3032 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3033
3034 static ssize_t store_bind(struct class_device *class_device,
3035                           const char *buf, size_t count)
3036 {
3037         struct con_driver *con = class_get_devdata(class_device);
3038         int bind = simple_strtoul(buf, NULL, 0);
3039
3040         if (bind)
3041                 vt_bind(con);
3042         else
3043                 vt_unbind(con);
3044
3045         return count;
3046 }
3047
3048 static ssize_t show_bind(struct class_device *class_device, char *buf)
3049 {
3050         struct con_driver *con = class_get_devdata(class_device);
3051         int bind = con_is_bound(con->con);
3052
3053         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3054 }
3055
3056 static ssize_t show_name(struct class_device *class_device, char *buf)
3057 {
3058         struct con_driver *con = class_get_devdata(class_device);
3059
3060         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3061                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3062                          con->desc);
3063
3064 }
3065
3066 static struct class_device_attribute class_device_attrs[] = {
3067         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3068         __ATTR(name, S_IRUGO, show_name, NULL),
3069 };
3070
3071 static int vtconsole_init_class_device(struct con_driver *con)
3072 {
3073         int i;
3074         int error = 0;
3075
3076         con->flag |= CON_DRIVER_FLAG_ATTR;
3077         class_set_devdata(con->class_dev, con);
3078         for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) {
3079                 error = class_device_create_file(con->class_dev,
3080                                          &class_device_attrs[i]);
3081                 if (error)
3082                         break;
3083         }
3084
3085         if (error) {
3086                 while (--i >= 0)
3087                         class_device_remove_file(con->class_dev,
3088                                          &class_device_attrs[i]);
3089                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3090         }
3091
3092         return error;
3093 }
3094
3095 static void vtconsole_deinit_class_device(struct con_driver *con)
3096 {
3097         int i;
3098
3099         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3100                 for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
3101                         class_device_remove_file(con->class_dev,
3102                                                  &class_device_attrs[i]);
3103                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3104         }
3105 }
3106
3107 /**
3108  * con_is_bound - checks if driver is bound to the console
3109  * @csw: console driver
3110  *
3111  * RETURNS: zero if unbound, nonzero if bound
3112  *
3113  * Drivers can call this and if zero, they should release
3114  * all resources allocated on con_startup()
3115  */
3116 int con_is_bound(const struct consw *csw)
3117 {
3118         int i, bound = 0;
3119
3120         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3121                 if (con_driver_map[i] == csw) {
3122                         bound = 1;
3123                         break;
3124                 }
3125         }
3126
3127         return bound;
3128 }
3129 EXPORT_SYMBOL(con_is_bound);
3130
3131 /**
3132  * register_con_driver - register console driver to console layer
3133  * @csw: console driver
3134  * @first: the first console to take over, minimum value is 0
3135  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3136  *
3137  * DESCRIPTION: This function registers a console driver which can later
3138  * bind to a range of consoles specified by @first and @last. It will
3139  * also initialize the console driver by calling con_startup().
3140  */
3141 int register_con_driver(const struct consw *csw, int first, int last)
3142 {
3143         struct module *owner = csw->owner;
3144         struct con_driver *con_driver;
3145         const char *desc;
3146         int i, retval = 0;
3147
3148         if (!try_module_get(owner))
3149                 return -ENODEV;
3150
3151         acquire_console_sem();
3152
3153         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3154                 con_driver = &registered_con_driver[i];
3155
3156                 /* already registered */
3157                 if (con_driver->con == csw)
3158                         retval = -EINVAL;
3159         }
3160
3161         if (retval)
3162                 goto err;
3163
3164         desc = csw->con_startup();
3165
3166         if (!desc)
3167                 goto err;
3168
3169         retval = -EINVAL;
3170
3171         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3172                 con_driver = &registered_con_driver[i];
3173
3174                 if (con_driver->con == NULL) {
3175                         con_driver->con = csw;
3176                         con_driver->desc = desc;
3177                         con_driver->node = i;
3178                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3179                                            CON_DRIVER_FLAG_INIT;
3180                         con_driver->first = first;
3181                         con_driver->last = last;
3182                         retval = 0;
3183                         break;
3184                 }
3185         }
3186
3187         if (retval)
3188                 goto err;
3189
3190         con_driver->class_dev = class_device_create(vtconsole_class, NULL,
3191                                                     MKDEV(0, con_driver->node),
3192                                                     NULL, "vtcon%i",
3193                                                     con_driver->node);
3194
3195         if (IS_ERR(con_driver->class_dev)) {
3196                 printk(KERN_WARNING "Unable to create class_device for %s; "
3197                        "errno = %ld\n", con_driver->desc,
3198                        PTR_ERR(con_driver->class_dev));
3199                 con_driver->class_dev = NULL;
3200         } else {
3201                 vtconsole_init_class_device(con_driver);
3202         }
3203
3204 err:
3205         release_console_sem();
3206         module_put(owner);
3207         return retval;
3208 }
3209 EXPORT_SYMBOL(register_con_driver);
3210
3211 /**
3212  * unregister_con_driver - unregister console driver from console layer
3213  * @csw: console driver
3214  *
3215  * DESCRIPTION: All drivers that registers to the console layer must
3216  * call this function upon exit, or if the console driver is in a state
3217  * where it won't be able to handle console services, such as the
3218  * framebuffer console without loaded framebuffer drivers.
3219  *
3220  * The driver must unbind first prior to unregistration.
3221  */
3222 int unregister_con_driver(const struct consw *csw)
3223 {
3224         int i, retval = -ENODEV;
3225
3226         acquire_console_sem();
3227
3228         /* cannot unregister a bound driver */
3229         if (con_is_bound(csw))
3230                 goto err;
3231
3232         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3233                 struct con_driver *con_driver = &registered_con_driver[i];
3234
3235                 if (con_driver->con == csw &&
3236                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3237                         vtconsole_deinit_class_device(con_driver);
3238                         class_device_destroy(vtconsole_class,
3239                                              MKDEV(0, con_driver->node));
3240                         con_driver->con = NULL;
3241                         con_driver->desc = NULL;
3242                         con_driver->class_dev = NULL;
3243                         con_driver->node = 0;
3244                         con_driver->flag = 0;
3245                         con_driver->first = 0;
3246                         con_driver->last = 0;
3247                         retval = 0;
3248                         break;
3249                 }
3250         }
3251 err:
3252         release_console_sem();
3253         return retval;
3254 }
3255 EXPORT_SYMBOL(unregister_con_driver);
3256
3257 /*
3258  *      If we support more console drivers, this function is used
3259  *      when a driver wants to take over some existing consoles
3260  *      and become default driver for newly opened ones.
3261  *
3262  *      take_over_console is basically a register followed by unbind
3263  */
3264 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3265 {
3266         int err;
3267
3268         err = register_con_driver(csw, first, last);
3269
3270         if (!err)
3271                 bind_con_driver(csw, first, last, deflt);
3272
3273         return err;
3274 }
3275
3276 /*
3277  * give_up_console is a wrapper to unregister_con_driver. It will only
3278  * work if driver is fully unbound.
3279  */
3280 void give_up_console(const struct consw *csw)
3281 {
3282         unregister_con_driver(csw);
3283 }
3284
3285 static int __init vtconsole_class_init(void)
3286 {
3287         int i;
3288
3289         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3290         if (IS_ERR(vtconsole_class)) {
3291                 printk(KERN_WARNING "Unable to create vt console class; "
3292                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3293                 vtconsole_class = NULL;
3294         }
3295
3296         /* Add system drivers to sysfs */
3297         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3298                 struct con_driver *con = &registered_con_driver[i];
3299
3300                 if (con->con && !con->class_dev) {
3301                         con->class_dev =
3302                                 class_device_create(vtconsole_class, NULL,
3303                                                     MKDEV(0, con->node), NULL,
3304                                                     "vtcon%i", con->node);
3305
3306                         if (IS_ERR(con->class_dev)) {
3307                                 printk(KERN_WARNING "Unable to create "
3308                                        "class_device for %s; errno = %ld\n",
3309                                        con->desc, PTR_ERR(con->class_dev));
3310                                 con->class_dev = NULL;
3311                         } else {
3312                                 vtconsole_init_class_device(con);
3313                         }
3314                 }
3315         }
3316
3317         return 0;
3318 }
3319 postcore_initcall(vtconsole_class_init);
3320
3321 #endif
3322
3323 /*
3324  *      Screen blanking
3325  */
3326
3327 static void set_vesa_blanking(char __user *p)
3328 {
3329     unsigned int mode;
3330     get_user(mode, p + 1);
3331     vesa_blank_mode = (mode < 4) ? mode : 0;
3332 }
3333
3334 void do_blank_screen(int entering_gfx)
3335 {
3336         struct vc_data *vc = vc_cons[fg_console].d;
3337         int i;
3338
3339         WARN_CONSOLE_UNLOCKED();
3340
3341         if (console_blanked) {
3342                 if (blank_state == blank_vesa_wait) {
3343                         blank_state = blank_off;
3344                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3345                 }
3346                 return;
3347         }
3348         if (blank_state != blank_normal_wait)
3349                 return;
3350         blank_state = blank_off;
3351
3352         /* entering graphics mode? */
3353         if (entering_gfx) {
3354                 hide_cursor(vc);
3355                 save_screen(vc);
3356                 vc->vc_sw->con_blank(vc, -1, 1);
3357                 console_blanked = fg_console + 1;
3358                 set_origin(vc);
3359                 return;
3360         }
3361
3362         /* don't blank graphics */
3363         if (vc->vc_mode != KD_TEXT) {
3364                 console_blanked = fg_console + 1;
3365                 return;
3366         }
3367
3368         hide_cursor(vc);
3369         del_timer_sync(&console_timer);
3370         blank_timer_expired = 0;
3371
3372         save_screen(vc);
3373         /* In case we need to reset origin, blanking hook returns 1 */
3374         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3375         console_blanked = fg_console + 1;
3376         if (i)
3377                 set_origin(vc);
3378
3379         if (console_blank_hook && console_blank_hook(1))
3380                 return;
3381
3382         if (vesa_off_interval && vesa_blank_mode) {
3383                 blank_state = blank_vesa_wait;
3384                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3385         }
3386 }
3387 EXPORT_SYMBOL(do_blank_screen);
3388
3389 /*
3390  * Called by timer as well as from vt_console_driver
3391  */
3392 void do_unblank_screen(int leaving_gfx)
3393 {
3394         struct vc_data *vc;
3395
3396         /* This should now always be called from a "sane" (read: can schedule)
3397          * context for the sake of the low level drivers, except in the special
3398          * case of oops_in_progress
3399          */
3400         if (!oops_in_progress)
3401                 might_sleep();
3402
3403         WARN_CONSOLE_UNLOCKED();
3404
3405         ignore_poke = 0;
3406         if (!console_blanked)
3407                 return;
3408         if (!vc_cons_allocated(fg_console)) {
3409                 /* impossible */
3410                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3411                 return;
3412         }
3413         vc = vc_cons[fg_console].d;
3414         if (vc->vc_mode != KD_TEXT)
3415                 return; /* but leave console_blanked != 0 */
3416
3417         if (blankinterval) {
3418                 mod_timer(&console_timer, jiffies + blankinterval);
3419                 blank_state = blank_normal_wait;
3420         }
3421
3422         console_blanked = 0;
3423         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3424                 /* Low-level driver cannot restore -> do it ourselves */
3425                 update_screen(vc);
3426         if (console_blank_hook)
3427                 console_blank_hook(0);
3428         set_palette(vc);
3429         set_cursor(vc);
3430 }
3431 EXPORT_SYMBOL(do_unblank_screen);
3432
3433 /*
3434  * This is called by the outside world to cause a forced unblank, mostly for
3435  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3436  * call it with 1 as an argument and so force a mode restore... that may kill
3437  * X or at least garbage the screen but would also make the Oops visible...
3438  */
3439 void unblank_screen(void)
3440 {
3441         do_unblank_screen(0);
3442 }
3443
3444 /*
3445  * We defer the timer blanking to work queue so it can take the console mutex
3446  * (console operations can still happen at irq time, but only from printk which
3447  * has the console mutex. Not perfect yet, but better than no locking
3448  */
3449 static void blank_screen_t(unsigned long dummy)
3450 {
3451         if (unlikely(!keventd_up())) {
3452                 mod_timer(&console_timer, jiffies + blankinterval);
3453                 return;
3454         }
3455         blank_timer_expired = 1;
3456         schedule_work(&console_work);
3457 }
3458
3459 void poke_blanked_console(void)
3460 {
3461         WARN_CONSOLE_UNLOCKED();
3462
3463         /* Add this so we quickly catch whoever might call us in a non
3464          * safe context. Nowadays, unblank_screen() isn't to be called in
3465          * atomic contexts and is allowed to schedule (with the special case
3466          * of oops_in_progress, but that isn't of any concern for this
3467          * function. --BenH.
3468          */
3469         might_sleep();
3470
3471         /* This isn't perfectly race free, but a race here would be mostly harmless,
3472          * at worse, we'll do a spurrious blank and it's unlikely
3473          */
3474         del_timer(&console_timer);
3475         blank_timer_expired = 0;
3476
3477         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3478                 return;
3479         if (console_blanked)
3480                 unblank_screen();
3481         else if (blankinterval) {
3482                 mod_timer(&console_timer, jiffies + blankinterval);
3483                 blank_state = blank_normal_wait;
3484         }
3485 }
3486
3487 /*
3488  *      Palettes
3489  */
3490
3491 static void set_palette(struct vc_data *vc)
3492 {
3493         WARN_CONSOLE_UNLOCKED();
3494
3495         if (vc->vc_mode != KD_GRAPHICS)
3496                 vc->vc_sw->con_set_palette(vc, color_table);
3497 }
3498
3499 static int set_get_cmap(unsigned char __user *arg, int set)
3500 {
3501     int i, j, k;
3502
3503     WARN_CONSOLE_UNLOCKED();
3504
3505     for (i = 0; i < 16; i++)
3506         if (set) {
3507             get_user(default_red[i], arg++);
3508             get_user(default_grn[i], arg++);
3509             get_user(default_blu[i], arg++);
3510         } else {
3511             put_user(default_red[i], arg++);
3512             put_user(default_grn[i], arg++);
3513             put_user(default_blu[i], arg++);
3514         }
3515     if (set) {
3516         for (i = 0; i < MAX_NR_CONSOLES; i++)
3517             if (vc_cons_allocated(i)) {
3518                 for (j = k = 0; j < 16; j++) {
3519                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3520                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3521                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3522                 }
3523                 set_palette(vc_cons[i].d);
3524             }
3525     }
3526     return 0;
3527 }
3528
3529 /*
3530  * Load palette into the DAC registers. arg points to a colour
3531  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3532  */
3533
3534 int con_set_cmap(unsigned char __user *arg)
3535 {
3536         int rc;
3537
3538         acquire_console_sem();
3539         rc = set_get_cmap (arg,1);
3540         release_console_sem();
3541
3542         return rc;
3543 }
3544
3545 int con_get_cmap(unsigned char __user *arg)
3546 {
3547         int rc;
3548
3549         acquire_console_sem();
3550         rc = set_get_cmap (arg,0);
3551         release_console_sem();
3552
3553         return rc;
3554 }
3555
3556 void reset_palette(struct vc_data *vc)
3557 {
3558         int j, k;
3559         for (j=k=0; j<16; j++) {
3560                 vc->vc_palette[k++] = default_red[j];
3561                 vc->vc_palette[k++] = default_grn[j];
3562                 vc->vc_palette[k++] = default_blu[j];
3563         }
3564         set_palette(vc);
3565 }
3566
3567 /*
3568  *  Font switching
3569  *
3570  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3571  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 
3572  *  depending on width) reserved for each character which is kinda wasty, but 
3573  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It 
3574  *  is upto the actual low-level console-driver convert data into its favorite
3575  *  format (maybe we should add a `fontoffset' field to the `display'
3576  *  structure so we won't have to convert the fontdata all the time.
3577  *  /Jes
3578  */
3579
3580 #define max_font_size 65536
3581
3582 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3583 {
3584         struct console_font font;
3585         int rc = -EINVAL;
3586         int c;
3587
3588         if (vc->vc_mode != KD_TEXT)
3589                 return -EINVAL;
3590
3591         if (op->data) {
3592                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3593                 if (!font.data)
3594                         return -ENOMEM;
3595         } else
3596                 font.data = NULL;
3597
3598         acquire_console_sem();
3599         if (vc->vc_sw->con_font_get)
3600                 rc = vc->vc_sw->con_font_get(vc, &font);
3601         else
3602                 rc = -ENOSYS;
3603         release_console_sem();
3604
3605         if (rc)
3606                 goto out;
3607
3608         c = (font.width+7)/8 * 32 * font.charcount;
3609         
3610         if (op->data && font.charcount > op->charcount)
3611                 rc = -ENOSPC;
3612         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3613                 if (font.width > op->width || font.height > op->height) 
3614                         rc = -ENOSPC;
3615         } else {
3616                 if (font.width != 8)
3617                         rc = -EIO;
3618                 else if ((op->height && font.height > op->height) ||
3619                          font.height > 32)
3620                         rc = -ENOSPC;
3621         }
3622         if (rc)
3623                 goto out;
3624
3625         op->height = font.height;
3626         op->width = font.width;
3627         op->charcount = font.charcount;
3628
3629         if (op->data && copy_to_user(op->data, font.data, c))
3630                 rc = -EFAULT;
3631
3632 out:
3633         kfree(font.data);
3634         return rc;
3635 }
3636
3637 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3638 {
3639         struct console_font font;
3640         int rc = -EINVAL;
3641         int size;
3642
3643         if (vc->vc_mode != KD_TEXT)
3644                 return -EINVAL;
3645         if (!op->data)
3646                 return -EINVAL;
3647         if (op->charcount > 512)
3648                 return -EINVAL;
3649         if (!op->height) {              /* Need to guess font height [compat] */
3650                 int h, i;
3651                 u8 __user *charmap = op->data;
3652                 u8 tmp;
3653                 
3654                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3655                    so that we can get rid of this soon */
3656                 if (!(op->flags & KD_FONT_FLAG_OLD))
3657                         return -EINVAL;
3658                 for (h = 32; h > 0; h--)
3659                         for (i = 0; i < op->charcount; i++) {
3660                                 if (get_user(tmp, &charmap[32*i+h-1]))
3661                                         return -EFAULT;
3662                                 if (tmp)
3663                                         goto nonzero;
3664                         }
3665                 return -EINVAL;
3666         nonzero:
3667                 op->height = h;
3668         }
3669         if (op->width <= 0 || op->width > 32 || op->height > 32)
3670                 return -EINVAL;
3671         size = (op->width+7)/8 * 32 * op->charcount;
3672         if (size > max_font_size)
3673                 return -ENOSPC;
3674         font.charcount = op->charcount;
3675         font.height = op->height;
3676         font.width = op->width;
3677         font.data = kmalloc(size, GFP_KERNEL);
3678         if (!font.data)
3679                 return -ENOMEM;
3680         if (copy_from_user(font.data, op->data, size)) {
3681                 kfree(font.data);
3682                 return -EFAULT;
3683         }
3684         acquire_console_sem();
3685         if (vc->vc_sw->con_font_set)
3686                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3687         else
3688                 rc = -ENOSYS;
3689         release_console_sem();
3690         kfree(font.data);
3691         return rc;
3692 }
3693
3694 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3695 {
3696         struct console_font font = {.width = op->width, .height = op->height};
3697         char name[MAX_FONT_NAME];
3698         char *s = name;
3699         int rc;
3700
3701         if (vc->vc_mode != KD_TEXT)
3702                 return -EINVAL;
3703
3704         if (!op->data)
3705                 s = NULL;
3706         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3707                 return -EFAULT;
3708         else
3709                 name[MAX_FONT_NAME - 1] = 0;
3710
3711         acquire_console_sem();
3712         if (vc->vc_sw->con_font_default)
3713                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3714         else
3715                 rc = -ENOSYS;
3716         release_console_sem();
3717         if (!rc) {
3718                 op->width = font.width;
3719                 op->height = font.height;
3720         }
3721         return rc;
3722 }
3723
3724 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3725 {
3726         int con = op->height;
3727         int rc;
3728
3729         if (vc->vc_mode != KD_TEXT)
3730                 return -EINVAL;
3731
3732         acquire_console_sem();
3733         if (!vc->vc_sw->con_font_copy)
3734                 rc = -ENOSYS;
3735         else if (con < 0 || !vc_cons_allocated(con))
3736                 rc = -ENOTTY;
3737         else if (con == vc->vc_num)     /* nothing to do */
3738                 rc = 0;
3739         else
3740                 rc = vc->vc_sw->con_font_copy(vc, con);
3741         release_console_sem();
3742         return rc;
3743 }
3744
3745 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3746 {
3747         switch (op->op) {
3748         case KD_FONT_OP_SET:
3749                 return con_font_set(vc, op);
3750         case KD_FONT_OP_GET:
3751                 return con_font_get(vc, op);
3752         case KD_FONT_OP_SET_DEFAULT:
3753                 return con_font_default(vc, op);
3754         case KD_FONT_OP_COPY:
3755                 return con_font_copy(vc, op);
3756         }
3757         return -ENOSYS;
3758 }
3759
3760 /*
3761  *      Interface exported to selection and vcs.
3762  */
3763
3764 /* used by selection */
3765 u16 screen_glyph(struct vc_data *vc, int offset)
3766 {
3767         u16 w = scr_readw(screenpos(vc, offset, 1));
3768         u16 c = w & 0xff;
3769
3770         if (w & vc->vc_hi_font_mask)
3771                 c |= 0x100;
3772         return c;
3773 }
3774
3775 /* used by vcs - note the word offset */
3776 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3777 {
3778         return screenpos(vc, 2 * w_offset, viewed);
3779 }
3780
3781 void getconsxy(struct vc_data *vc, unsigned char *p)
3782 {
3783         p[0] = vc->vc_x;
3784         p[1] = vc->vc_y;
3785 }
3786
3787 void putconsxy(struct vc_data *vc, unsigned char *p)
3788 {
3789         hide_cursor(vc);
3790         gotoxy(vc, p[0], p[1]);
3791         set_cursor(vc);
3792 }
3793
3794 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3795 {
3796         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3797                 return softcursor_original;
3798         return scr_readw(org);
3799 }
3800
3801 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3802 {
3803         scr_writew(val, org);
3804         if ((unsigned long)org == vc->vc_pos) {
3805                 softcursor_original = -1;
3806                 add_softcursor(vc);
3807         }
3808 }
3809
3810 /*
3811  *      Visible symbols for modules
3812  */
3813
3814 EXPORT_SYMBOL(color_table);
3815 EXPORT_SYMBOL(default_red);
3816 EXPORT_SYMBOL(default_grn);
3817 EXPORT_SYMBOL(default_blu);
3818 EXPORT_SYMBOL(update_region);
3819 EXPORT_SYMBOL(redraw_screen);
3820 EXPORT_SYMBOL(vc_resize);
3821 EXPORT_SYMBOL(vc_lock_resize);
3822 EXPORT_SYMBOL(fg_console);
3823 EXPORT_SYMBOL(console_blank_hook);
3824 EXPORT_SYMBOL(console_blanked);
3825 EXPORT_SYMBOL(vc_cons);
3826 #ifndef VT_SINGLE_DRIVER
3827 EXPORT_SYMBOL(take_over_console);
3828 EXPORT_SYMBOL(give_up_console);
3829 #endif