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