[PATCH] vt: Delay the update of the visible console
[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 int old_offset = -1;
438         static unsigned short old;
439         static unsigned short oldx, oldy;
440
441         WARN_CONSOLE_UNLOCKED();
442
443         if (old_offset != -1 && old_offset >= 0 &&
444             old_offset < vc->vc_screenbuf_size) {
445                 scr_writew(old, screenpos(vc, old_offset, 1));
446                 if (DO_UPDATE(vc))
447                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
448         }
449
450         old_offset = offset;
451
452         if (offset != -1 && offset >= 0 &&
453             offset < vc->vc_screenbuf_size) {
454                 unsigned short new;
455                 unsigned short *p;
456                 p = screenpos(vc, offset, 1);
457                 old = scr_readw(p);
458                 new = old ^ vc->vc_complement_mask;
459                 scr_writew(new, p);
460                 if (DO_UPDATE(vc)) {
461                         oldx = (offset >> 1) % vc->vc_cols;
462                         oldy = (offset >> 1) / vc->vc_cols;
463                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
464                 }
465         }
466
467 }
468
469 static void insert_char(struct vc_data *vc, unsigned int nr)
470 {
471         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
472
473         p = q + vc->vc_cols - nr - vc->vc_x;
474         while (--p >= q)
475                 scr_writew(scr_readw(p), p + nr);
476         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
477         vc->vc_need_wrap = 0;
478         if (DO_UPDATE(vc)) {
479                 unsigned short oldattr = vc->vc_attr;
480                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
481                                      vc->vc_cols - vc->vc_x - nr);
482                 vc->vc_attr = vc->vc_video_erase_char >> 8;
483                 while (nr--)
484                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
485                 vc->vc_attr = oldattr;
486         }
487 }
488
489 static void delete_char(struct vc_data *vc, unsigned int nr)
490 {
491         unsigned int i = vc->vc_x;
492         unsigned short *p = (unsigned short *)vc->vc_pos;
493
494         while (++i <= vc->vc_cols - nr) {
495                 scr_writew(scr_readw(p+nr), p);
496                 p++;
497         }
498         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
499         vc->vc_need_wrap = 0;
500         if (DO_UPDATE(vc)) {
501                 unsigned short oldattr = vc->vc_attr;
502                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
503                                      vc->vc_cols - vc->vc_x - nr);
504                 vc->vc_attr = vc->vc_video_erase_char >> 8;
505                 while (nr--)
506                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
507                                      vc->vc_cols - 1 - nr);
508                 vc->vc_attr = oldattr;
509         }
510 }
511
512 static int softcursor_original;
513
514 static void add_softcursor(struct vc_data *vc)
515 {
516         int i = scr_readw((u16 *) vc->vc_pos);
517         u32 type = vc->vc_cursor_type;
518
519         if (! (type & 0x10)) return;
520         if (softcursor_original != -1) return;
521         softcursor_original = i;
522         i |= ((type >> 8) & 0xff00 );
523         i ^= ((type) & 0xff00 );
524         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
525         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
526         scr_writew(i, (u16 *) vc->vc_pos);
527         if (DO_UPDATE(vc))
528                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
529 }
530
531 static void hide_softcursor(struct vc_data *vc)
532 {
533         if (softcursor_original != -1) {
534                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
535                 if (DO_UPDATE(vc))
536                         vc->vc_sw->con_putc(vc, softcursor_original,
537                                         vc->vc_y, vc->vc_x);
538                 softcursor_original = -1;
539         }
540 }
541
542 static void hide_cursor(struct vc_data *vc)
543 {
544         if (vc == sel_cons)
545                 clear_selection();
546         vc->vc_sw->con_cursor(vc, CM_ERASE);
547         hide_softcursor(vc);
548 }
549
550 static void set_cursor(struct vc_data *vc)
551 {
552         if (!IS_FG(vc) || console_blanked ||
553             vc->vc_mode == KD_GRAPHICS)
554                 return;
555         if (vc->vc_deccm) {
556                 if (vc == sel_cons)
557                         clear_selection();
558                 add_softcursor(vc);
559                 if ((vc->vc_cursor_type & 0x0f) != 1)
560                         vc->vc_sw->con_cursor(vc, CM_DRAW);
561         } else
562                 hide_cursor(vc);
563 }
564
565 static void set_origin(struct vc_data *vc)
566 {
567         WARN_CONSOLE_UNLOCKED();
568
569         if (!CON_IS_VISIBLE(vc) ||
570             !vc->vc_sw->con_set_origin ||
571             !vc->vc_sw->con_set_origin(vc))
572                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
573         vc->vc_visible_origin = vc->vc_origin;
574         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
575         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
576 }
577
578 static inline void save_screen(struct vc_data *vc)
579 {
580         WARN_CONSOLE_UNLOCKED();
581
582         if (vc->vc_sw->con_save_screen)
583                 vc->vc_sw->con_save_screen(vc);
584 }
585
586 /*
587  *      Redrawing of screen
588  */
589
590 static void clear_buffer_attributes(struct vc_data *vc)
591 {
592         unsigned short *p = (unsigned short *)vc->vc_origin;
593         int count = vc->vc_screenbuf_size / 2;
594         int mask = vc->vc_hi_font_mask | 0xff;
595
596         for (; count > 0; count--, p++) {
597                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
598         }
599 }
600
601 void redraw_screen(struct vc_data *vc, int is_switch)
602 {
603         int redraw = 0;
604
605         WARN_CONSOLE_UNLOCKED();
606
607         if (!vc) {
608                 /* strange ... */
609                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
610                 return;
611         }
612
613         if (is_switch) {
614                 struct vc_data *old_vc = vc_cons[fg_console].d;
615                 if (old_vc == vc)
616                         return;
617                 if (!CON_IS_VISIBLE(vc))
618                         redraw = 1;
619                 *vc->vc_display_fg = vc;
620                 fg_console = vc->vc_num;
621                 hide_cursor(old_vc);
622                 if (!CON_IS_VISIBLE(old_vc)) {
623                         save_screen(old_vc);
624                         set_origin(old_vc);
625                 }
626         } else {
627                 hide_cursor(vc);
628                 redraw = 1;
629         }
630
631         if (redraw) {
632                 int update;
633                 int old_was_color = vc->vc_can_do_color;
634
635                 set_origin(vc);
636                 update = vc->vc_sw->con_switch(vc);
637                 set_palette(vc);
638                 /*
639                  * If console changed from mono<->color, the best we can do
640                  * is to clear the buffer attributes. As it currently stands,
641                  * rebuilding new attributes from the old buffer is not doable
642                  * without overly complex code.
643                  */
644                 if (old_was_color != vc->vc_can_do_color) {
645                         update_attr(vc);
646                         clear_buffer_attributes(vc);
647                 }
648                 if (update && vc->vc_mode != KD_GRAPHICS)
649                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
650         }
651         set_cursor(vc);
652         if (is_switch) {
653                 set_leds();
654                 compute_shiftstate();
655         }
656 }
657
658 /*
659  *      Allocation, freeing and resizing of VTs.
660  */
661
662 int vc_cons_allocated(unsigned int i)
663 {
664         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
665 }
666
667 static void visual_init(struct vc_data *vc, int num, int init)
668 {
669         /* ++Geert: vc->vc_sw->con_init determines console size */
670         if (vc->vc_sw)
671                 module_put(vc->vc_sw->owner);
672         vc->vc_sw = conswitchp;
673 #ifndef VT_SINGLE_DRIVER
674         if (con_driver_map[num])
675                 vc->vc_sw = con_driver_map[num];
676 #endif
677         __module_get(vc->vc_sw->owner);
678         vc->vc_num = num;
679         vc->vc_display_fg = &master_display_fg;
680         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
681         vc->vc_uni_pagedir = 0;
682         vc->vc_hi_font_mask = 0;
683         vc->vc_complement_mask = 0;
684         vc->vc_can_do_color = 0;
685         vc->vc_sw->con_init(vc, init);
686         if (!vc->vc_complement_mask)
687                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
688         vc->vc_s_complement_mask = vc->vc_complement_mask;
689         vc->vc_size_row = vc->vc_cols << 1;
690         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
691 }
692
693 int vc_allocate(unsigned int currcons)  /* return 0 on success */
694 {
695         WARN_CONSOLE_UNLOCKED();
696
697         if (currcons >= MAX_NR_CONSOLES)
698                 return -ENXIO;
699         if (!vc_cons[currcons].d) {
700             struct vc_data *vc;
701
702             /* prevent users from taking too much memory */
703             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
704               return -EPERM;
705
706             /* due to the granularity of kmalloc, we waste some memory here */
707             /* the alloc is done in two steps, to optimize the common situation
708                of a 25x80 console (structsize=216, screenbuf_size=4000) */
709             /* although the numbers above are not valid since long ago, the
710                point is still up-to-date and the comment still has its value
711                even if only as a historical artifact.  --mj, July 1998 */
712             vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
713             if (!vc)
714                 return -ENOMEM;
715             memset(vc, 0, sizeof(*vc));
716             vc_cons[currcons].d = vc;
717             visual_init(vc, currcons, 1);
718             if (!*vc->vc_uni_pagedir_loc)
719                 con_set_default_unimap(vc);
720             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
721             if (!vc->vc_screenbuf) {
722                 kfree(vc);
723                 vc_cons[currcons].d = NULL;
724                 return -ENOMEM;
725             }
726             vc->vc_kmalloced = 1;
727             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
728         }
729         return 0;
730 }
731
732 static inline int resize_screen(struct vc_data *vc, int width, int height)
733 {
734         /* Resizes the resolution of the display adapater */
735         int err = 0;
736
737         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
738                 err = vc->vc_sw->con_resize(vc, width, height);
739         return err;
740 }
741
742 /*
743  * Change # of rows and columns (0 means unchanged/the size of fg_console)
744  * [this is to be used together with some user program
745  * like resize that changes the hardware videomode]
746  */
747 #define VC_RESIZE_MAXCOL (32767)
748 #define VC_RESIZE_MAXROW (32767)
749 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
750 {
751         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
752         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
753         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
754         unsigned int end;
755         unsigned short *newscreen;
756
757         WARN_CONSOLE_UNLOCKED();
758
759         if (!vc)
760                 return -ENXIO;
761
762         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
763                 return -EINVAL;
764
765         new_cols = (cols ? cols : vc->vc_cols);
766         new_rows = (lines ? lines : vc->vc_rows);
767         new_row_size = new_cols << 1;
768         new_screen_size = new_row_size * new_rows;
769
770         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
771                 return 0;
772
773         newscreen = (unsigned short *) kmalloc(new_screen_size, GFP_USER);
774         if (!newscreen)
775                 return -ENOMEM;
776
777         old_rows = vc->vc_rows;
778         old_cols = vc->vc_cols;
779         old_row_size = vc->vc_size_row;
780         old_screen_size = vc->vc_screenbuf_size;
781
782         err = resize_screen(vc, new_cols, new_rows);
783         if (err) {
784                 kfree(newscreen);
785                 return err;
786         }
787
788         vc->vc_rows = new_rows;
789         vc->vc_cols = new_cols;
790         vc->vc_size_row = new_row_size;
791         vc->vc_screenbuf_size = new_screen_size;
792
793         rlth = min(old_row_size, new_row_size);
794         rrem = new_row_size - rlth;
795         old_origin = vc->vc_origin;
796         new_origin = (long) newscreen;
797         new_scr_end = new_origin + new_screen_size;
798
799         if (vc->vc_y > new_rows) {
800                 if (old_rows - vc->vc_y < new_rows) {
801                         /*
802                          * Cursor near the bottom, copy contents from the
803                          * bottom of buffer
804                          */
805                         old_origin += (old_rows - new_rows) * old_row_size;
806                         end = vc->vc_scr_end;
807                 } else {
808                         /*
809                          * Cursor is in no man's land, copy 1/2 screenful
810                          * from the top and bottom of cursor position
811                          */
812                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
813                         end = old_origin + (old_row_size * new_rows);
814                 }
815         } else
816                 /*
817                  * Cursor near the top, copy contents from the top of buffer
818                  */
819                 end = (old_rows > new_rows) ? old_origin +
820                         (old_row_size * new_rows) :
821                         vc->vc_scr_end;
822
823         update_attr(vc);
824
825         while (old_origin < end) {
826                 scr_memcpyw((unsigned short *) new_origin,
827                             (unsigned short *) old_origin, rlth);
828                 if (rrem)
829                         scr_memsetw((void *)(new_origin + rlth),
830                                     vc->vc_video_erase_char, rrem);
831                 old_origin += old_row_size;
832                 new_origin += new_row_size;
833         }
834         if (new_scr_end > new_origin)
835                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
836                             new_scr_end - new_origin);
837         if (vc->vc_kmalloced)
838                 kfree(vc->vc_screenbuf);
839         vc->vc_screenbuf = newscreen;
840         vc->vc_kmalloced = 1;
841         vc->vc_screenbuf_size = new_screen_size;
842         set_origin(vc);
843
844         /* do part of a reset_terminal() */
845         vc->vc_top = 0;
846         vc->vc_bottom = vc->vc_rows;
847         gotoxy(vc, vc->vc_x, vc->vc_y);
848         save_cur(vc);
849
850         if (vc->vc_tty) {
851                 struct winsize ws, *cws = &vc->vc_tty->winsize;
852
853                 memset(&ws, 0, sizeof(ws));
854                 ws.ws_row = vc->vc_rows;
855                 ws.ws_col = vc->vc_cols;
856                 ws.ws_ypixel = vc->vc_scan_lines;
857                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
858                     vc->vc_tty->pgrp > 0)
859                         kill_pg(vc->vc_tty->pgrp, SIGWINCH, 1);
860                 *cws = ws;
861         }
862
863         if (CON_IS_VISIBLE(vc))
864                 update_screen(vc);
865         return err;
866 }
867
868
869 void vc_disallocate(unsigned int currcons)
870 {
871         WARN_CONSOLE_UNLOCKED();
872
873         if (vc_cons_allocated(currcons)) {
874                 struct vc_data *vc = vc_cons[currcons].d;
875                 vc->vc_sw->con_deinit(vc);
876                 if (vc->vc_kmalloced)
877                         kfree(vc->vc_screenbuf);
878                 if (currcons >= MIN_NR_CONSOLES)
879                         kfree(vc);
880                 vc_cons[currcons].d = NULL;
881         }
882 }
883
884 /*
885  *      VT102 emulator
886  */
887
888 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
889 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
890 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
891
892 #define decarm          VC_REPEAT
893 #define decckm          VC_CKMODE
894 #define kbdapplic       VC_APPLIC
895 #define lnm             VC_CRLF
896
897 /*
898  * this is what the terminal answers to a ESC-Z or csi0c query.
899  */
900 #define VT100ID "\033[?1;2c"
901 #define VT102ID "\033[?6c"
902
903 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
904                                        8,12,10,14, 9,13,11,15 };
905
906 /* the default colour table, for VGA+ colour systems */
907 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
908     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
909 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
910     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
911 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
912     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
913
914 /*
915  * gotoxy() must verify all boundaries, because the arguments
916  * might also be negative. If the given position is out of
917  * bounds, the cursor is placed at the nearest margin.
918  */
919 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
920 {
921         int min_y, max_y;
922
923         if (new_x < 0)
924                 vc->vc_x = 0;
925         else {
926                 if (new_x >= vc->vc_cols)
927                         vc->vc_x = vc->vc_cols - 1;
928                 else
929                         vc->vc_x = new_x;
930         }
931
932         if (vc->vc_decom) {
933                 min_y = vc->vc_top;
934                 max_y = vc->vc_bottom;
935         } else {
936                 min_y = 0;
937                 max_y = vc->vc_rows;
938         }
939         if (new_y < min_y)
940                 vc->vc_y = min_y;
941         else if (new_y >= max_y)
942                 vc->vc_y = max_y - 1;
943         else
944                 vc->vc_y = new_y;
945         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
946         vc->vc_need_wrap = 0;
947 }
948
949 /* for absolute user moves, when decom is set */
950 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
951 {
952         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
953 }
954
955 void scrollback(struct vc_data *vc, int lines)
956 {
957         if (!lines)
958                 lines = vc->vc_rows / 2;
959         scrolldelta(-lines);
960 }
961
962 void scrollfront(struct vc_data *vc, int lines)
963 {
964         if (!lines)
965                 lines = vc->vc_rows / 2;
966         scrolldelta(lines);
967 }
968
969 static void lf(struct vc_data *vc)
970 {
971         /* don't scroll if above bottom of scrolling region, or
972          * if below scrolling region
973          */
974         if (vc->vc_y + 1 == vc->vc_bottom)
975                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
976         else if (vc->vc_y < vc->vc_rows - 1) {
977                 vc->vc_y++;
978                 vc->vc_pos += vc->vc_size_row;
979         }
980         vc->vc_need_wrap = 0;
981 }
982
983 static void ri(struct vc_data *vc)
984 {
985         /* don't scroll if below top of scrolling region, or
986          * if above scrolling region
987          */
988         if (vc->vc_y == vc->vc_top)
989                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
990         else if (vc->vc_y > 0) {
991                 vc->vc_y--;
992                 vc->vc_pos -= vc->vc_size_row;
993         }
994         vc->vc_need_wrap = 0;
995 }
996
997 static inline void cr(struct vc_data *vc)
998 {
999         vc->vc_pos -= vc->vc_x << 1;
1000         vc->vc_need_wrap = vc->vc_x = 0;
1001 }
1002
1003 static inline void bs(struct vc_data *vc)
1004 {
1005         if (vc->vc_x) {
1006                 vc->vc_pos -= 2;
1007                 vc->vc_x--;
1008                 vc->vc_need_wrap = 0;
1009         }
1010 }
1011
1012 static inline void del(struct vc_data *vc)
1013 {
1014         /* ignored */
1015 }
1016
1017 static void csi_J(struct vc_data *vc, int vpar)
1018 {
1019         unsigned int count;
1020         unsigned short * start;
1021
1022         switch (vpar) {
1023                 case 0: /* erase from cursor to end of display */
1024                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1025                         start = (unsigned short *)vc->vc_pos;
1026                         if (DO_UPDATE(vc)) {
1027                                 /* do in two stages */
1028                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1029                                               vc->vc_cols - vc->vc_x);
1030                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1031                                               vc->vc_rows - vc->vc_y - 1,
1032                                               vc->vc_cols);
1033                         }
1034                         break;
1035                 case 1: /* erase from start to cursor */
1036                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1037                         start = (unsigned short *)vc->vc_origin;
1038                         if (DO_UPDATE(vc)) {
1039                                 /* do in two stages */
1040                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1041                                               vc->vc_cols);
1042                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1043                                               vc->vc_x + 1);
1044                         }
1045                         break;
1046                 case 2: /* erase whole display */
1047                         count = vc->vc_cols * vc->vc_rows;
1048                         start = (unsigned short *)vc->vc_origin;
1049                         if (DO_UPDATE(vc))
1050                                 vc->vc_sw->con_clear(vc, 0, 0,
1051                                               vc->vc_rows,
1052                                               vc->vc_cols);
1053                         break;
1054                 default:
1055                         return;
1056         }
1057         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1058         vc->vc_need_wrap = 0;
1059 }
1060
1061 static void csi_K(struct vc_data *vc, int vpar)
1062 {
1063         unsigned int count;
1064         unsigned short * start;
1065
1066         switch (vpar) {
1067                 case 0: /* erase from cursor to end of line */
1068                         count = vc->vc_cols - vc->vc_x;
1069                         start = (unsigned short *)vc->vc_pos;
1070                         if (DO_UPDATE(vc))
1071                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1072                                                      vc->vc_cols - vc->vc_x);
1073                         break;
1074                 case 1: /* erase from start of line to cursor */
1075                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1076                         count = vc->vc_x + 1;
1077                         if (DO_UPDATE(vc))
1078                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1079                                                      vc->vc_x + 1);
1080                         break;
1081                 case 2: /* erase whole line */
1082                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1083                         count = vc->vc_cols;
1084                         if (DO_UPDATE(vc))
1085                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1086                                               vc->vc_cols);
1087                         break;
1088                 default:
1089                         return;
1090         }
1091         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1092         vc->vc_need_wrap = 0;
1093 }
1094
1095 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1096 {                                         /* not vt100? */
1097         int count;
1098
1099         if (!vpar)
1100                 vpar++;
1101         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1102
1103         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1104         if (DO_UPDATE(vc))
1105                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1106         vc->vc_need_wrap = 0;
1107 }
1108
1109 static void default_attr(struct vc_data *vc)
1110 {
1111         vc->vc_intensity = 1;
1112         vc->vc_underline = 0;
1113         vc->vc_reverse = 0;
1114         vc->vc_blink = 0;
1115         vc->vc_color = vc->vc_def_color;
1116 }
1117
1118 /* console_sem is held */
1119 static void csi_m(struct vc_data *vc)
1120 {
1121         int i;
1122
1123         for (i = 0; i <= vc->vc_npar; i++)
1124                 switch (vc->vc_par[i]) {
1125                         case 0: /* all attributes off */
1126                                 default_attr(vc);
1127                                 break;
1128                         case 1:
1129                                 vc->vc_intensity = 2;
1130                                 break;
1131                         case 2:
1132                                 vc->vc_intensity = 0;
1133                                 break;
1134                         case 4:
1135                                 vc->vc_underline = 1;
1136                                 break;
1137                         case 5:
1138                                 vc->vc_blink = 1;
1139                                 break;
1140                         case 7:
1141                                 vc->vc_reverse = 1;
1142                                 break;
1143                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1144                                   * Select primary font, don't display
1145                                   * control chars if defined, don't set
1146                                   * bit 8 on output.
1147                                   */
1148                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1149                                                 ? vc->vc_G0_charset
1150                                                 : vc->vc_G1_charset, vc);
1151                                 vc->vc_disp_ctrl = 0;
1152                                 vc->vc_toggle_meta = 0;
1153                                 break;
1154                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1155                                   * Select first alternate font, lets
1156                                   * chars < 32 be displayed as ROM chars.
1157                                   */
1158                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1159                                 vc->vc_disp_ctrl = 1;
1160                                 vc->vc_toggle_meta = 0;
1161                                 break;
1162                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1163                                   * Select second alternate font, toggle
1164                                   * high bit before displaying as ROM char.
1165                                   */
1166                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1167                                 vc->vc_disp_ctrl = 1;
1168                                 vc->vc_toggle_meta = 1;
1169                                 break;
1170                         case 21:
1171                         case 22:
1172                                 vc->vc_intensity = 1;
1173                                 break;
1174                         case 24:
1175                                 vc->vc_underline = 0;
1176                                 break;
1177                         case 25:
1178                                 vc->vc_blink = 0;
1179                                 break;
1180                         case 27:
1181                                 vc->vc_reverse = 0;
1182                                 break;
1183                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1184                                   * Enables underscore, white foreground
1185                                   * with white underscore (Linux - use
1186                                   * default foreground).
1187                                   */
1188                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1189                                 vc->vc_underline = 1;
1190                                 break;
1191                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1192                                   * Disable underline option.
1193                                   * Reset colour to default? It did this
1194                                   * before...
1195                                   */
1196                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1197                                 vc->vc_underline = 0;
1198                                 break;
1199                         case 49:
1200                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1201                                 break;
1202                         default:
1203                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1204                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1205                                                 | (vc->vc_color & 0xf0);
1206                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1207                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1208                                                 | (vc->vc_color & 0x0f);
1209                                 break;
1210                 }
1211         update_attr(vc);
1212 }
1213
1214 static void respond_string(const char *p, struct tty_struct *tty)
1215 {
1216         while (*p) {
1217                 tty_insert_flip_char(tty, *p, 0);
1218                 p++;
1219         }
1220         con_schedule_flip(tty);
1221 }
1222
1223 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1224 {
1225         char buf[40];
1226
1227         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1228         respond_string(buf, tty);
1229 }
1230
1231 static inline void status_report(struct tty_struct *tty)
1232 {
1233         respond_string("\033[0n", tty); /* Terminal ok */
1234 }
1235
1236 static inline void respond_ID(struct tty_struct * tty)
1237 {
1238         respond_string(VT102ID, tty);
1239 }
1240
1241 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1242 {
1243         char buf[8];
1244
1245         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1246                 (char)('!' + mry));
1247         respond_string(buf, tty);
1248 }
1249
1250 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1251 int mouse_reporting(void)
1252 {
1253         return vc_cons[fg_console].d->vc_report_mouse;
1254 }
1255
1256 /* console_sem is held */
1257 static void set_mode(struct vc_data *vc, int on_off)
1258 {
1259         int i;
1260
1261         for (i = 0; i <= vc->vc_npar; i++)
1262                 if (vc->vc_ques) {
1263                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1264                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1265                                 if (on_off)
1266                                         set_kbd(vc, decckm);
1267                                 else
1268                                         clr_kbd(vc, decckm);
1269                                 break;
1270                         case 3: /* 80/132 mode switch unimplemented */
1271                                 vc->vc_deccolm = on_off;
1272 #if 0
1273                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1274                                 /* this alone does not suffice; some user mode
1275                                    utility has to change the hardware regs */
1276 #endif
1277                                 break;
1278                         case 5:                 /* Inverted screen on/off */
1279                                 if (vc->vc_decscnm != on_off) {
1280                                         vc->vc_decscnm = on_off;
1281                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1282                                         update_attr(vc);
1283                                 }
1284                                 break;
1285                         case 6:                 /* Origin relative/absolute */
1286                                 vc->vc_decom = on_off;
1287                                 gotoxay(vc, 0, 0);
1288                                 break;
1289                         case 7:                 /* Autowrap on/off */
1290                                 vc->vc_decawm = on_off;
1291                                 break;
1292                         case 8:                 /* Autorepeat on/off */
1293                                 if (on_off)
1294                                         set_kbd(vc, decarm);
1295                                 else
1296                                         clr_kbd(vc, decarm);
1297                                 break;
1298                         case 9:
1299                                 vc->vc_report_mouse = on_off ? 1 : 0;
1300                                 break;
1301                         case 25:                /* Cursor on/off */
1302                                 vc->vc_deccm = on_off;
1303                                 break;
1304                         case 1000:
1305                                 vc->vc_report_mouse = on_off ? 2 : 0;
1306                                 break;
1307                         }
1308                 } else {
1309                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1310                         case 3:                 /* Monitor (display ctrls) */
1311                                 vc->vc_disp_ctrl = on_off;
1312                                 break;
1313                         case 4:                 /* Insert Mode on/off */
1314                                 vc->vc_decim = on_off;
1315                                 break;
1316                         case 20:                /* Lf, Enter == CrLf/Lf */
1317                                 if (on_off)
1318                                         set_kbd(vc, lnm);
1319                                 else
1320                                         clr_kbd(vc, lnm);
1321                                 break;
1322                         }
1323                 }
1324 }
1325
1326 /* console_sem is held */
1327 static void setterm_command(struct vc_data *vc)
1328 {
1329         switch(vc->vc_par[0]) {
1330                 case 1: /* set color for underline mode */
1331                         if (vc->vc_can_do_color &&
1332                                         vc->vc_par[1] < 16) {
1333                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1334                                 if (vc->vc_underline)
1335                                         update_attr(vc);
1336                         }
1337                         break;
1338                 case 2: /* set color for half intensity mode */
1339                         if (vc->vc_can_do_color &&
1340                                         vc->vc_par[1] < 16) {
1341                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1342                                 if (vc->vc_intensity == 0)
1343                                         update_attr(vc);
1344                         }
1345                         break;
1346                 case 8: /* store colors as defaults */
1347                         vc->vc_def_color = vc->vc_attr;
1348                         if (vc->vc_hi_font_mask == 0x100)
1349                                 vc->vc_def_color >>= 1;
1350                         default_attr(vc);
1351                         update_attr(vc);
1352                         break;
1353                 case 9: /* set blanking interval */
1354                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1355                         poke_blanked_console();
1356                         break;
1357                 case 10: /* set bell frequency in Hz */
1358                         if (vc->vc_npar >= 1)
1359                                 vc->vc_bell_pitch = vc->vc_par[1];
1360                         else
1361                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1362                         break;
1363                 case 11: /* set bell duration in msec */
1364                         if (vc->vc_npar >= 1)
1365                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1366                                         vc->vc_par[1] * HZ / 1000 : 0;
1367                         else
1368                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1369                         break;
1370                 case 12: /* bring specified console to the front */
1371                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1372                                 set_console(vc->vc_par[1] - 1);
1373                         break;
1374                 case 13: /* unblank the screen */
1375                         poke_blanked_console();
1376                         break;
1377                 case 14: /* set vesa powerdown interval */
1378                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1379                         break;
1380                 case 15: /* activate the previous console */
1381                         set_console(last_console);
1382                         break;
1383         }
1384 }
1385
1386 /* console_sem is held */
1387 static void csi_at(struct vc_data *vc, unsigned int nr)
1388 {
1389         if (nr > vc->vc_cols - vc->vc_x)
1390                 nr = vc->vc_cols - vc->vc_x;
1391         else if (!nr)
1392                 nr = 1;
1393         insert_char(vc, nr);
1394 }
1395
1396 /* console_sem is held */
1397 static void csi_L(struct vc_data *vc, unsigned int nr)
1398 {
1399         if (nr > vc->vc_rows - vc->vc_y)
1400                 nr = vc->vc_rows - vc->vc_y;
1401         else if (!nr)
1402                 nr = 1;
1403         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1404         vc->vc_need_wrap = 0;
1405 }
1406
1407 /* console_sem is held */
1408 static void csi_P(struct vc_data *vc, unsigned int nr)
1409 {
1410         if (nr > vc->vc_cols - vc->vc_x)
1411                 nr = vc->vc_cols - vc->vc_x;
1412         else if (!nr)
1413                 nr = 1;
1414         delete_char(vc, nr);
1415 }
1416
1417 /* console_sem is held */
1418 static void csi_M(struct vc_data *vc, unsigned int nr)
1419 {
1420         if (nr > vc->vc_rows - vc->vc_y)
1421                 nr = vc->vc_rows - vc->vc_y;
1422         else if (!nr)
1423                 nr=1;
1424         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1425         vc->vc_need_wrap = 0;
1426 }
1427
1428 /* console_sem is held (except via vc_init->reset_terminal */
1429 static void save_cur(struct vc_data *vc)
1430 {
1431         vc->vc_saved_x          = vc->vc_x;
1432         vc->vc_saved_y          = vc->vc_y;
1433         vc->vc_s_intensity      = vc->vc_intensity;
1434         vc->vc_s_underline      = vc->vc_underline;
1435         vc->vc_s_blink          = vc->vc_blink;
1436         vc->vc_s_reverse        = vc->vc_reverse;
1437         vc->vc_s_charset        = vc->vc_charset;
1438         vc->vc_s_color          = vc->vc_color;
1439         vc->vc_saved_G0         = vc->vc_G0_charset;
1440         vc->vc_saved_G1         = vc->vc_G1_charset;
1441 }
1442
1443 /* console_sem is held */
1444 static void restore_cur(struct vc_data *vc)
1445 {
1446         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1447         vc->vc_intensity        = vc->vc_s_intensity;
1448         vc->vc_underline        = vc->vc_s_underline;
1449         vc->vc_blink            = vc->vc_s_blink;
1450         vc->vc_reverse          = vc->vc_s_reverse;
1451         vc->vc_charset          = vc->vc_s_charset;
1452         vc->vc_color            = vc->vc_s_color;
1453         vc->vc_G0_charset       = vc->vc_saved_G0;
1454         vc->vc_G1_charset       = vc->vc_saved_G1;
1455         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1456         update_attr(vc);
1457         vc->vc_need_wrap = 0;
1458 }
1459
1460 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1461         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1462         ESpalette };
1463
1464 /* console_sem is held (except via vc_init()) */
1465 static void reset_terminal(struct vc_data *vc, int do_clear)
1466 {
1467         vc->vc_top              = 0;
1468         vc->vc_bottom           = vc->vc_rows;
1469         vc->vc_state            = ESnormal;
1470         vc->vc_ques             = 0;
1471         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1472         vc->vc_G0_charset       = LAT1_MAP;
1473         vc->vc_G1_charset       = GRAF_MAP;
1474         vc->vc_charset          = 0;
1475         vc->vc_need_wrap        = 0;
1476         vc->vc_report_mouse     = 0;
1477         vc->vc_utf              = 0;
1478         vc->vc_utf_count        = 0;
1479
1480         vc->vc_disp_ctrl        = 0;
1481         vc->vc_toggle_meta      = 0;
1482
1483         vc->vc_decscnm          = 0;
1484         vc->vc_decom            = 0;
1485         vc->vc_decawm           = 1;
1486         vc->vc_deccm            = 1;
1487         vc->vc_decim            = 0;
1488
1489         set_kbd(vc, decarm);
1490         clr_kbd(vc, decckm);
1491         clr_kbd(vc, kbdapplic);
1492         clr_kbd(vc, lnm);
1493         kbd_table[vc->vc_num].lockstate = 0;
1494         kbd_table[vc->vc_num].slockstate = 0;
1495         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1496         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1497         /* do not do set_leds here because this causes an endless tasklet loop
1498            when the keyboard hasn't been initialized yet */
1499
1500         vc->vc_cursor_type = CUR_DEFAULT;
1501         vc->vc_complement_mask = vc->vc_s_complement_mask;
1502
1503         default_attr(vc);
1504         update_attr(vc);
1505
1506         vc->vc_tab_stop[0]      = 0x01010100;
1507         vc->vc_tab_stop[1]      =
1508         vc->vc_tab_stop[2]      =
1509         vc->vc_tab_stop[3]      =
1510         vc->vc_tab_stop[4]      = 0x01010101;
1511
1512         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1513         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1514
1515         gotoxy(vc, 0, 0);
1516         save_cur(vc);
1517         if (do_clear)
1518             csi_J(vc, 2);
1519 }
1520
1521 /* console_sem is held */
1522 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1523 {
1524         /*
1525          *  Control characters can be used in the _middle_
1526          *  of an escape sequence.
1527          */
1528         switch (c) {
1529         case 0:
1530                 return;
1531         case 7:
1532                 if (vc->vc_bell_duration)
1533                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1534                 return;
1535         case 8:
1536                 bs(vc);
1537                 return;
1538         case 9:
1539                 vc->vc_pos -= (vc->vc_x << 1);
1540                 while (vc->vc_x < vc->vc_cols - 1) {
1541                         vc->vc_x++;
1542                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1543                                 break;
1544                 }
1545                 vc->vc_pos += (vc->vc_x << 1);
1546                 return;
1547         case 10: case 11: case 12:
1548                 lf(vc);
1549                 if (!is_kbd(vc, lnm))
1550                         return;
1551         case 13:
1552                 cr(vc);
1553                 return;
1554         case 14:
1555                 vc->vc_charset = 1;
1556                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1557                 vc->vc_disp_ctrl = 1;
1558                 return;
1559         case 15:
1560                 vc->vc_charset = 0;
1561                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1562                 vc->vc_disp_ctrl = 0;
1563                 return;
1564         case 24: case 26:
1565                 vc->vc_state = ESnormal;
1566                 return;
1567         case 27:
1568                 vc->vc_state = ESesc;
1569                 return;
1570         case 127:
1571                 del(vc);
1572                 return;
1573         case 128+27:
1574                 vc->vc_state = ESsquare;
1575                 return;
1576         }
1577         switch(vc->vc_state) {
1578         case ESesc:
1579                 vc->vc_state = ESnormal;
1580                 switch (c) {
1581                 case '[':
1582                         vc->vc_state = ESsquare;
1583                         return;
1584                 case ']':
1585                         vc->vc_state = ESnonstd;
1586                         return;
1587                 case '%':
1588                         vc->vc_state = ESpercent;
1589                         return;
1590                 case 'E':
1591                         cr(vc);
1592                         lf(vc);
1593                         return;
1594                 case 'M':
1595                         ri(vc);
1596                         return;
1597                 case 'D':
1598                         lf(vc);
1599                         return;
1600                 case 'H':
1601                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1602                         return;
1603                 case 'Z':
1604                         respond_ID(tty);
1605                         return;
1606                 case '7':
1607                         save_cur(vc);
1608                         return;
1609                 case '8':
1610                         restore_cur(vc);
1611                         return;
1612                 case '(':
1613                         vc->vc_state = ESsetG0;
1614                         return;
1615                 case ')':
1616                         vc->vc_state = ESsetG1;
1617                         return;
1618                 case '#':
1619                         vc->vc_state = EShash;
1620                         return;
1621                 case 'c':
1622                         reset_terminal(vc, 1);
1623                         return;
1624                 case '>':  /* Numeric keypad */
1625                         clr_kbd(vc, kbdapplic);
1626                         return;
1627                 case '=':  /* Appl. keypad */
1628                         set_kbd(vc, kbdapplic);
1629                         return;
1630                 }
1631                 return;
1632         case ESnonstd:
1633                 if (c=='P') {   /* palette escape sequence */
1634                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1635                                 vc->vc_par[vc->vc_npar] = 0;
1636                         vc->vc_npar = 0;
1637                         vc->vc_state = ESpalette;
1638                         return;
1639                 } else if (c=='R') {   /* reset palette */
1640                         reset_palette(vc);
1641                         vc->vc_state = ESnormal;
1642                 } else
1643                         vc->vc_state = ESnormal;
1644                 return;
1645         case ESpalette:
1646                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1647                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1648                         if (vc->vc_npar == 7) {
1649                                 int i = vc->vc_par[0] * 3, j = 1;
1650                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1651                                 vc->vc_palette[i++] += vc->vc_par[j++];
1652                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1653                                 vc->vc_palette[i++] += vc->vc_par[j++];
1654                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1655                                 vc->vc_palette[i] += vc->vc_par[j];
1656                                 set_palette(vc);
1657                                 vc->vc_state = ESnormal;
1658                         }
1659                 } else
1660                         vc->vc_state = ESnormal;
1661                 return;
1662         case ESsquare:
1663                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1664                         vc->vc_par[vc->vc_npar] = 0;
1665                 vc->vc_npar = 0;
1666                 vc->vc_state = ESgetpars;
1667                 if (c == '[') { /* Function key */
1668                         vc->vc_state=ESfunckey;
1669                         return;
1670                 }
1671                 vc->vc_ques = (c == '?');
1672                 if (vc->vc_ques)
1673                         return;
1674         case ESgetpars:
1675                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1676                         vc->vc_npar++;
1677                         return;
1678                 } else if (c>='0' && c<='9') {
1679                         vc->vc_par[vc->vc_npar] *= 10;
1680                         vc->vc_par[vc->vc_npar] += c - '0';
1681                         return;
1682                 } else
1683                         vc->vc_state = ESgotpars;
1684         case ESgotpars:
1685                 vc->vc_state = ESnormal;
1686                 switch(c) {
1687                 case 'h':
1688                         set_mode(vc, 1);
1689                         return;
1690                 case 'l':
1691                         set_mode(vc, 0);
1692                         return;
1693                 case 'c':
1694                         if (vc->vc_ques) {
1695                                 if (vc->vc_par[0])
1696                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1697                                 else
1698                                         vc->vc_cursor_type = CUR_DEFAULT;
1699                                 return;
1700                         }
1701                         break;
1702                 case 'm':
1703                         if (vc->vc_ques) {
1704                                 clear_selection();
1705                                 if (vc->vc_par[0])
1706                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1707                                 else
1708                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1709                                 return;
1710                         }
1711                         break;
1712                 case 'n':
1713                         if (!vc->vc_ques) {
1714                                 if (vc->vc_par[0] == 5)
1715                                         status_report(tty);
1716                                 else if (vc->vc_par[0] == 6)
1717                                         cursor_report(vc, tty);
1718                         }
1719                         return;
1720                 }
1721                 if (vc->vc_ques) {
1722                         vc->vc_ques = 0;
1723                         return;
1724                 }
1725                 switch(c) {
1726                 case 'G': case '`':
1727                         if (vc->vc_par[0])
1728                                 vc->vc_par[0]--;
1729                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1730                         return;
1731                 case 'A':
1732                         if (!vc->vc_par[0])
1733                                 vc->vc_par[0]++;
1734                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1735                         return;
1736                 case 'B': case 'e':
1737                         if (!vc->vc_par[0])
1738                                 vc->vc_par[0]++;
1739                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1740                         return;
1741                 case 'C': case 'a':
1742                         if (!vc->vc_par[0])
1743                                 vc->vc_par[0]++;
1744                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1745                         return;
1746                 case 'D':
1747                         if (!vc->vc_par[0])
1748                                 vc->vc_par[0]++;
1749                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1750                         return;
1751                 case 'E':
1752                         if (!vc->vc_par[0])
1753                                 vc->vc_par[0]++;
1754                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1755                         return;
1756                 case 'F':
1757                         if (!vc->vc_par[0])
1758                                 vc->vc_par[0]++;
1759                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1760                         return;
1761                 case 'd':
1762                         if (vc->vc_par[0])
1763                                 vc->vc_par[0]--;
1764                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1765                         return;
1766                 case 'H': case 'f':
1767                         if (vc->vc_par[0])
1768                                 vc->vc_par[0]--;
1769                         if (vc->vc_par[1])
1770                                 vc->vc_par[1]--;
1771                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1772                         return;
1773                 case 'J':
1774                         csi_J(vc, vc->vc_par[0]);
1775                         return;
1776                 case 'K':
1777                         csi_K(vc, vc->vc_par[0]);
1778                         return;
1779                 case 'L':
1780                         csi_L(vc, vc->vc_par[0]);
1781                         return;
1782                 case 'M':
1783                         csi_M(vc, vc->vc_par[0]);
1784                         return;
1785                 case 'P':
1786                         csi_P(vc, vc->vc_par[0]);
1787                         return;
1788                 case 'c':
1789                         if (!vc->vc_par[0])
1790                                 respond_ID(tty);
1791                         return;
1792                 case 'g':
1793                         if (!vc->vc_par[0])
1794                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1795                         else if (vc->vc_par[0] == 3) {
1796                                 vc->vc_tab_stop[0] =
1797                                         vc->vc_tab_stop[1] =
1798                                         vc->vc_tab_stop[2] =
1799                                         vc->vc_tab_stop[3] =
1800                                         vc->vc_tab_stop[4] = 0;
1801                         }
1802                         return;
1803                 case 'm':
1804                         csi_m(vc);
1805                         return;
1806                 case 'q': /* DECLL - but only 3 leds */
1807                         /* map 0,1,2,3 to 0,1,2,4 */
1808                         if (vc->vc_par[0] < 4)
1809                                 setledstate(kbd_table + vc->vc_num,
1810                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1811                         return;
1812                 case 'r':
1813                         if (!vc->vc_par[0])
1814                                 vc->vc_par[0]++;
1815                         if (!vc->vc_par[1])
1816                                 vc->vc_par[1] = vc->vc_rows;
1817                         /* Minimum allowed region is 2 lines */
1818                         if (vc->vc_par[0] < vc->vc_par[1] &&
1819                             vc->vc_par[1] <= vc->vc_rows) {
1820                                 vc->vc_top = vc->vc_par[0] - 1;
1821                                 vc->vc_bottom = vc->vc_par[1];
1822                                 gotoxay(vc, 0, 0);
1823                         }
1824                         return;
1825                 case 's':
1826                         save_cur(vc);
1827                         return;
1828                 case 'u':
1829                         restore_cur(vc);
1830                         return;
1831                 case 'X':
1832                         csi_X(vc, vc->vc_par[0]);
1833                         return;
1834                 case '@':
1835                         csi_at(vc, vc->vc_par[0]);
1836                         return;
1837                 case ']': /* setterm functions */
1838                         setterm_command(vc);
1839                         return;
1840                 }
1841                 return;
1842         case ESpercent:
1843                 vc->vc_state = ESnormal;
1844                 switch (c) {
1845                 case '@':  /* defined in ISO 2022 */
1846                         vc->vc_utf = 0;
1847                         return;
1848                 case 'G':  /* prelim official escape code */
1849                 case '8':  /* retained for compatibility */
1850                         vc->vc_utf = 1;
1851                         return;
1852                 }
1853                 return;
1854         case ESfunckey:
1855                 vc->vc_state = ESnormal;
1856                 return;
1857         case EShash:
1858                 vc->vc_state = ESnormal;
1859                 if (c == '8') {
1860                         /* DEC screen alignment test. kludge :-) */
1861                         vc->vc_video_erase_char =
1862                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1863                         csi_J(vc, 2);
1864                         vc->vc_video_erase_char =
1865                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1866                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1867                 }
1868                 return;
1869         case ESsetG0:
1870                 if (c == '0')
1871                         vc->vc_G0_charset = GRAF_MAP;
1872                 else if (c == 'B')
1873                         vc->vc_G0_charset = LAT1_MAP;
1874                 else if (c == 'U')
1875                         vc->vc_G0_charset = IBMPC_MAP;
1876                 else if (c == 'K')
1877                         vc->vc_G0_charset = USER_MAP;
1878                 if (vc->vc_charset == 0)
1879                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1880                 vc->vc_state = ESnormal;
1881                 return;
1882         case ESsetG1:
1883                 if (c == '0')
1884                         vc->vc_G1_charset = GRAF_MAP;
1885                 else if (c == 'B')
1886                         vc->vc_G1_charset = LAT1_MAP;
1887                 else if (c == 'U')
1888                         vc->vc_G1_charset = IBMPC_MAP;
1889                 else if (c == 'K')
1890                         vc->vc_G1_charset = USER_MAP;
1891                 if (vc->vc_charset == 1)
1892                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1893                 vc->vc_state = ESnormal;
1894                 return;
1895         default:
1896                 vc->vc_state = ESnormal;
1897         }
1898 }
1899
1900 /* This is a temporary buffer used to prepare a tty console write
1901  * so that we can easily avoid touching user space while holding the
1902  * console spinlock.  It is allocated in con_init and is shared by
1903  * this code and the vc_screen read/write tty calls.
1904  *
1905  * We have to allocate this statically in the kernel data section
1906  * since console_init (and thus con_init) are called before any
1907  * kernel memory allocation is available.
1908  */
1909 char con_buf[CON_BUF_SIZE];
1910 DECLARE_MUTEX(con_buf_sem);
1911
1912 /* acquires console_sem */
1913 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1914 {
1915 #ifdef VT_BUF_VRAM_ONLY
1916 #define FLUSH do { } while(0);
1917 #else
1918 #define FLUSH if (draw_x >= 0) { \
1919         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1920         draw_x = -1; \
1921         }
1922 #endif
1923
1924         int c, tc, ok, n = 0, draw_x = -1;
1925         unsigned int currcons;
1926         unsigned long draw_from = 0, draw_to = 0;
1927         struct vc_data *vc;
1928         u16 himask, charmask;
1929         const unsigned char *orig_buf = NULL;
1930         int orig_count;
1931
1932         if (in_interrupt())
1933                 return count;
1934
1935         might_sleep();
1936
1937         acquire_console_sem();
1938         vc = tty->driver_data;
1939         if (vc == NULL) {
1940                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1941                 release_console_sem();
1942                 return 0;
1943         }
1944
1945         currcons = vc->vc_num;
1946         if (!vc_cons_allocated(currcons)) {
1947             /* could this happen? */
1948             static int error = 0;
1949             if (!error) {
1950                 error = 1;
1951                 printk("con_write: tty %d not allocated\n", currcons+1);
1952             }
1953             release_console_sem();
1954             return 0;
1955         }
1956         release_console_sem();
1957
1958         orig_buf = buf;
1959         orig_count = count;
1960
1961         /* At this point 'buf' is guaranteed to be a kernel buffer
1962          * and therefore no access to userspace (and therefore sleeping)
1963          * will be needed.  The con_buf_sem serializes all tty based
1964          * console rendering and vcs write/read operations.  We hold
1965          * the console spinlock during the entire write.
1966          */
1967
1968         acquire_console_sem();
1969
1970         vc = tty->driver_data;
1971         if (vc == NULL) {
1972                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
1973                 release_console_sem();
1974                 goto out;
1975         }
1976
1977         himask = vc->vc_hi_font_mask;
1978         charmask = himask ? 0x1ff : 0xff;
1979
1980         /* undraw cursor first */
1981         if (IS_FG(vc))
1982                 hide_cursor(vc);
1983
1984         while (!tty->stopped && count) {
1985                 int orig = *buf;
1986                 c = orig;
1987                 buf++;
1988                 n++;
1989                 count--;
1990
1991                 /* Do no translation at all in control states */
1992                 if (vc->vc_state != ESnormal) {
1993                         tc = c;
1994                 } else if (vc->vc_utf) {
1995                     /* Combine UTF-8 into Unicode */
1996                     /* Incomplete characters silently ignored */
1997                     if(c > 0x7f) {
1998                         if (vc->vc_utf_count > 0 && (c & 0xc0) == 0x80) {
1999                                 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2000                                 vc->vc_utf_count--;
2001                                 if (vc->vc_utf_count == 0)
2002                                     tc = c = vc->vc_utf_char;
2003                                 else continue;
2004                         } else {
2005                                 if ((c & 0xe0) == 0xc0) {
2006                                     vc->vc_utf_count = 1;
2007                                     vc->vc_utf_char = (c & 0x1f);
2008                                 } else if ((c & 0xf0) == 0xe0) {
2009                                     vc->vc_utf_count = 2;
2010                                     vc->vc_utf_char = (c & 0x0f);
2011                                 } else if ((c & 0xf8) == 0xf0) {
2012                                     vc->vc_utf_count = 3;
2013                                     vc->vc_utf_char = (c & 0x07);
2014                                 } else if ((c & 0xfc) == 0xf8) {
2015                                     vc->vc_utf_count = 4;
2016                                     vc->vc_utf_char = (c & 0x03);
2017                                 } else if ((c & 0xfe) == 0xfc) {
2018                                     vc->vc_utf_count = 5;
2019                                     vc->vc_utf_char = (c & 0x01);
2020                                 } else
2021                                     vc->vc_utf_count = 0;
2022                                 continue;
2023                               }
2024                     } else {
2025                       tc = c;
2026                       vc->vc_utf_count = 0;
2027                     }
2028                 } else {        /* no utf */
2029                   tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2030                 }
2031
2032                 /* If the original code was a control character we
2033                  * only allow a glyph to be displayed if the code is
2034                  * not normally used (such as for cursor movement) or
2035                  * if the disp_ctrl mode has been explicitly enabled.
2036                  * Certain characters (as given by the CTRL_ALWAYS
2037                  * bitmap) are always displayed as control characters,
2038                  * as the console would be pretty useless without
2039                  * them; to display an arbitrary font position use the
2040                  * direct-to-font zone in UTF-8 mode.
2041                  */
2042                 ok = tc && (c >= 32 ||
2043                             (!vc->vc_utf && !(((vc->vc_disp_ctrl ? CTRL_ALWAYS
2044                                                 : CTRL_ACTION) >> c) & 1)))
2045                         && (c != 127 || vc->vc_disp_ctrl)
2046                         && (c != 128+27);
2047
2048                 if (vc->vc_state == ESnormal && ok) {
2049                         /* Now try to find out how to display it */
2050                         tc = conv_uni_to_pc(vc, tc);
2051                         if ( tc == -4 ) {
2052                                 /* If we got -4 (not found) then see if we have
2053                                    defined a replacement character (U+FFFD) */
2054                                 tc = conv_uni_to_pc(vc, 0xfffd);
2055
2056                                 /* One reason for the -4 can be that we just
2057                                    did a clear_unimap();
2058                                    try at least to show something. */
2059                                 if (tc == -4)
2060                                      tc = c;
2061                         } else if ( tc == -3 ) {
2062                                 /* Bad hash table -- hope for the best */
2063                                 tc = c;
2064                         }
2065                         if (tc & ~charmask)
2066                                 continue; /* Conversion failed */
2067
2068                         if (vc->vc_need_wrap || vc->vc_decim)
2069                                 FLUSH
2070                         if (vc->vc_need_wrap) {
2071                                 cr(vc);
2072                                 lf(vc);
2073                         }
2074                         if (vc->vc_decim)
2075                                 insert_char(vc, 1);
2076                         scr_writew(himask ?
2077                                      ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2078                                      (vc->vc_attr << 8) + tc,
2079                                    (u16 *) vc->vc_pos);
2080                         if (DO_UPDATE(vc) && draw_x < 0) {
2081                                 draw_x = vc->vc_x;
2082                                 draw_from = vc->vc_pos;
2083                         }
2084                         if (vc->vc_x == vc->vc_cols - 1) {
2085                                 vc->vc_need_wrap = vc->vc_decawm;
2086                                 draw_to = vc->vc_pos + 2;
2087                         } else {
2088                                 vc->vc_x++;
2089                                 draw_to = (vc->vc_pos += 2);
2090                         }
2091                         continue;
2092                 }
2093                 FLUSH
2094                 do_con_trol(tty, vc, orig);
2095         }
2096         FLUSH
2097         console_conditional_schedule();
2098         release_console_sem();
2099
2100 out:
2101         return n;
2102 #undef FLUSH
2103 }
2104
2105 /*
2106  * This is the console switching callback.
2107  *
2108  * Doing console switching in a process context allows
2109  * us to do the switches asynchronously (needed when we want
2110  * to switch due to a keyboard interrupt).  Synchronization
2111  * with other console code and prevention of re-entrancy is
2112  * ensured with console_sem.
2113  */
2114 static void console_callback(void *ignored)
2115 {
2116         acquire_console_sem();
2117
2118         if (want_console >= 0) {
2119                 if (want_console != fg_console &&
2120                     vc_cons_allocated(want_console)) {
2121                         hide_cursor(vc_cons[fg_console].d);
2122                         change_console(vc_cons[want_console].d);
2123                         /* we only changed when the console had already
2124                            been allocated - a new console is not created
2125                            in an interrupt routine */
2126                 }
2127                 want_console = -1;
2128         }
2129         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2130                 do_poke_blanked_console = 0;
2131                 poke_blanked_console();
2132         }
2133         if (scrollback_delta) {
2134                 struct vc_data *vc = vc_cons[fg_console].d;
2135                 clear_selection();
2136                 if (vc->vc_mode == KD_TEXT)
2137                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2138                 scrollback_delta = 0;
2139         }
2140         if (blank_timer_expired) {
2141                 do_blank_screen(0);
2142                 blank_timer_expired = 0;
2143         }
2144
2145         release_console_sem();
2146 }
2147
2148 void set_console(int nr)
2149 {
2150         want_console = nr;
2151         schedule_console_callback();
2152 }
2153
2154 struct tty_driver *console_driver;
2155
2156 #ifdef CONFIG_VT_CONSOLE
2157
2158 /*
2159  *      Console on virtual terminal
2160  *
2161  * The console must be locked when we get here.
2162  */
2163
2164 static void vt_console_print(struct console *co, const char *b, unsigned count)
2165 {
2166         struct vc_data *vc = vc_cons[fg_console].d;
2167         unsigned char c;
2168         static unsigned long printing;
2169         const ushort *start;
2170         ushort cnt = 0;
2171         ushort myx;
2172
2173         /* console busy or not yet initialized */
2174         if (!printable || test_and_set_bit(0, &printing))
2175                 return;
2176
2177         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2178                 vc = vc_cons[kmsg_redirect - 1].d;
2179
2180         /* read `x' only after setting currcons properly (otherwise
2181            the `x' macro will read the x of the foreground console). */
2182         myx = vc->vc_x;
2183
2184         if (!vc_cons_allocated(fg_console)) {
2185                 /* impossible */
2186                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2187                 goto quit;
2188         }
2189
2190         if (vc->vc_mode != KD_TEXT)
2191                 goto quit;
2192
2193         /* undraw cursor first */
2194         if (IS_FG(vc))
2195                 hide_cursor(vc);
2196
2197         start = (ushort *)vc->vc_pos;
2198
2199         /* Contrived structure to try to emulate original need_wrap behaviour
2200          * Problems caused when we have need_wrap set on '\n' character */
2201         while (count--) {
2202                 c = *b++;
2203                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
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_need_wrap)
2209                                         vc->vc_x--;
2210                                 cnt = 0;
2211                         }
2212                         if (c == 8) {           /* backspace */
2213                                 bs(vc);
2214                                 start = (ushort *)vc->vc_pos;
2215                                 myx = vc->vc_x;
2216                                 continue;
2217                         }
2218                         if (c != 13)
2219                                 lf(vc);
2220                         cr(vc);
2221                         start = (ushort *)vc->vc_pos;
2222                         myx = vc->vc_x;
2223                         if (c == 10 || c == 13)
2224                                 continue;
2225                 }
2226                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2227                 cnt++;
2228                 if (myx == vc->vc_cols - 1) {
2229                         vc->vc_need_wrap = 1;
2230                         continue;
2231                 }
2232                 vc->vc_pos += 2;
2233                 myx++;
2234         }
2235         if (cnt > 0) {
2236                 if (CON_IS_VISIBLE(vc))
2237                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2238                 vc->vc_x += cnt;
2239                 if (vc->vc_x == vc->vc_cols) {
2240                         vc->vc_x--;
2241                         vc->vc_need_wrap = 1;
2242                 }
2243         }
2244         set_cursor(vc);
2245
2246 quit:
2247         clear_bit(0, &printing);
2248 }
2249
2250 static struct tty_driver *vt_console_device(struct console *c, int *index)
2251 {
2252         *index = c->index ? c->index-1 : fg_console;
2253         return console_driver;
2254 }
2255
2256 static struct console vt_console_driver = {
2257         .name           = "tty",
2258         .write          = vt_console_print,
2259         .device         = vt_console_device,
2260         .unblank        = unblank_screen,
2261         .flags          = CON_PRINTBUFFER,
2262         .index          = -1,
2263 };
2264 #endif
2265
2266 /*
2267  *      Handling of Linux-specific VC ioctls
2268  */
2269
2270 /*
2271  * Generally a bit racy with respect to console_sem().
2272  *
2273  * There are some functions which don't need it.
2274  *
2275  * There are some functions which can sleep for arbitrary periods
2276  * (paste_selection) but we don't need the lock there anyway.
2277  *
2278  * set_selection has locking, and definitely needs it
2279  */
2280
2281 int tioclinux(struct tty_struct *tty, unsigned long arg)
2282 {
2283         char type, data;
2284         char __user *p = (char __user *)arg;
2285         int lines;
2286         int ret;
2287
2288         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2289                 return -EINVAL;
2290         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2291                 return -EPERM;
2292         if (get_user(type, p))
2293                 return -EFAULT;
2294         ret = 0;
2295         switch (type)
2296         {
2297                 case TIOCL_SETSEL:
2298                         acquire_console_sem();
2299                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2300                         release_console_sem();
2301                         break;
2302                 case TIOCL_PASTESEL:
2303                         ret = paste_selection(tty);
2304                         break;
2305                 case TIOCL_UNBLANKSCREEN:
2306                         acquire_console_sem();
2307                         unblank_screen();
2308                         release_console_sem();
2309                         break;
2310                 case TIOCL_SELLOADLUT:
2311                         ret = sel_loadlut(p);
2312                         break;
2313                 case TIOCL_GETSHIFTSTATE:
2314                         
2315         /*
2316          * Make it possible to react to Shift+Mousebutton.
2317          * Note that 'shift_state' is an undocumented
2318          * kernel-internal variable; programs not closely
2319          * related to the kernel should not use this.
2320          */
2321                         data = shift_state;
2322                         ret = __put_user(data, p);
2323                         break;
2324                 case TIOCL_GETMOUSEREPORTING:
2325                         data = mouse_reporting();
2326                         ret = __put_user(data, p);
2327                         break;
2328                 case TIOCL_SETVESABLANK:
2329                         set_vesa_blanking(p);
2330                         break;
2331                 case TIOCL_GETKMSGREDIRECT:
2332                         data = kmsg_redirect;
2333                         ret = __put_user(data, p);
2334                         break;
2335                 case TIOCL_SETKMSGREDIRECT:
2336                         if (!capable(CAP_SYS_ADMIN)) {
2337                                 ret = -EPERM;
2338                         } else {
2339                                 if (get_user(data, p+1))
2340                                         ret = -EFAULT;
2341                                 else
2342                                         kmsg_redirect = data;
2343                         }
2344                         break;
2345                 case TIOCL_GETFGCONSOLE:
2346                         ret = fg_console;
2347                         break;
2348                 case TIOCL_SCROLLCONSOLE:
2349                         if (get_user(lines, (s32 __user *)(p+4))) {
2350                                 ret = -EFAULT;
2351                         } else {
2352                                 scrollfront(vc_cons[fg_console].d, lines);
2353                                 ret = 0;
2354                         }
2355                         break;
2356                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2357                         acquire_console_sem();
2358                         ignore_poke = 1;
2359                         do_blank_screen(0);
2360                         release_console_sem();
2361                         break;
2362                 case TIOCL_BLANKEDSCREEN:
2363                         ret = console_blanked;
2364                         break;
2365                 default:
2366                         ret = -EINVAL;
2367                         break;
2368         }
2369         return ret;
2370 }
2371
2372 /*
2373  * /dev/ttyN handling
2374  */
2375
2376 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2377 {
2378         int     retval;
2379
2380         retval = do_con_write(tty, buf, count);
2381         con_flush_chars(tty);
2382
2383         return retval;
2384 }
2385
2386 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2387 {
2388         if (in_interrupt())
2389                 return; /* n_r3964 calls put_char() from interrupt context */
2390         do_con_write(tty, &ch, 1);
2391 }
2392
2393 static int con_write_room(struct tty_struct *tty)
2394 {
2395         if (tty->stopped)
2396                 return 0;
2397         return 4096;            /* No limit, really; we're not buffering */
2398 }
2399
2400 static int con_chars_in_buffer(struct tty_struct *tty)
2401 {
2402         return 0;               /* we're not buffering */
2403 }
2404
2405 /*
2406  * con_throttle and con_unthrottle are only used for
2407  * paste_selection(), which has to stuff in a large number of
2408  * characters...
2409  */
2410 static void con_throttle(struct tty_struct *tty)
2411 {
2412 }
2413
2414 static void con_unthrottle(struct tty_struct *tty)
2415 {
2416         struct vc_data *vc = tty->driver_data;
2417
2418         wake_up_interruptible(&vc->paste_wait);
2419 }
2420
2421 /*
2422  * Turn the Scroll-Lock LED on when the tty is stopped
2423  */
2424 static void con_stop(struct tty_struct *tty)
2425 {
2426         int console_num;
2427         if (!tty)
2428                 return;
2429         console_num = tty->index;
2430         if (!vc_cons_allocated(console_num))
2431                 return;
2432         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2433         set_leds();
2434 }
2435
2436 /*
2437  * Turn the Scroll-Lock LED off when the console is started
2438  */
2439 static void con_start(struct tty_struct *tty)
2440 {
2441         int console_num;
2442         if (!tty)
2443                 return;
2444         console_num = tty->index;
2445         if (!vc_cons_allocated(console_num))
2446                 return;
2447         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2448         set_leds();
2449 }
2450
2451 static void con_flush_chars(struct tty_struct *tty)
2452 {
2453         struct vc_data *vc;
2454
2455         if (in_interrupt())     /* from flush_to_ldisc */
2456                 return;
2457
2458         /* if we race with con_close(), vt may be null */
2459         acquire_console_sem();
2460         vc = tty->driver_data;
2461         if (vc)
2462                 set_cursor(vc);
2463         release_console_sem();
2464 }
2465
2466 /*
2467  * Allocate the console screen memory.
2468  */
2469 static int con_open(struct tty_struct *tty, struct file *filp)
2470 {
2471         unsigned int currcons = tty->index;
2472         int ret = 0;
2473
2474         acquire_console_sem();
2475         if (tty->driver_data == NULL) {
2476                 ret = vc_allocate(currcons);
2477                 if (ret == 0) {
2478                         struct vc_data *vc = vc_cons[currcons].d;
2479                         tty->driver_data = vc;
2480                         vc->vc_tty = tty;
2481
2482                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2483                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2484                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2485                         }
2486                         release_console_sem();
2487                         vcs_make_devfs(tty);
2488                         return ret;
2489                 }
2490         }
2491         release_console_sem();
2492         return ret;
2493 }
2494
2495 /*
2496  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2497  * and taking a ref against the tty while we're in the process of forgetting
2498  * about it and cleaning things up.
2499  *
2500  * This is because vcs_remove_devfs() can sleep and will drop the BKL.
2501  */
2502 static void con_close(struct tty_struct *tty, struct file *filp)
2503 {
2504         mutex_lock(&tty_mutex);
2505         acquire_console_sem();
2506         if (tty && tty->count == 1) {
2507                 struct vc_data *vc = tty->driver_data;
2508
2509                 if (vc)
2510                         vc->vc_tty = NULL;
2511                 tty->driver_data = NULL;
2512                 release_console_sem();
2513                 vcs_remove_devfs(tty);
2514                 mutex_unlock(&tty_mutex);
2515                 /*
2516                  * tty_mutex is released, but we still hold BKL, so there is
2517                  * still exclusion against init_dev()
2518                  */
2519                 return;
2520         }
2521         release_console_sem();
2522         mutex_unlock(&tty_mutex);
2523 }
2524
2525 static void vc_init(struct vc_data *vc, unsigned int rows,
2526                     unsigned int cols, int do_clear)
2527 {
2528         int j, k ;
2529
2530         vc->vc_cols = cols;
2531         vc->vc_rows = rows;
2532         vc->vc_size_row = cols << 1;
2533         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2534
2535         set_origin(vc);
2536         vc->vc_pos = vc->vc_origin;
2537         reset_vc(vc);
2538         for (j=k=0; j<16; j++) {
2539                 vc->vc_palette[k++] = default_red[j] ;
2540                 vc->vc_palette[k++] = default_grn[j] ;
2541                 vc->vc_palette[k++] = default_blu[j] ;
2542         }
2543         vc->vc_def_color       = 0x07;   /* white */
2544         vc->vc_ulcolor          = 0x0f;   /* bold white */
2545         vc->vc_halfcolor       = 0x08;   /* grey */
2546         init_waitqueue_head(&vc->paste_wait);
2547         reset_terminal(vc, do_clear);
2548 }
2549
2550 /*
2551  * This routine initializes console interrupts, and does nothing
2552  * else. If you want the screen to clear, call tty_write with
2553  * the appropriate escape-sequence.
2554  */
2555
2556 static int __init con_init(void)
2557 {
2558         const char *display_desc = NULL;
2559         struct vc_data *vc;
2560         unsigned int currcons = 0;
2561
2562         acquire_console_sem();
2563
2564         if (conswitchp)
2565                 display_desc = conswitchp->con_startup();
2566         if (!display_desc) {
2567                 fg_console = 0;
2568                 release_console_sem();
2569                 return 0;
2570         }
2571
2572         init_timer(&console_timer);
2573         console_timer.function = blank_screen_t;
2574         if (blankinterval) {
2575                 blank_state = blank_normal_wait;
2576                 mod_timer(&console_timer, jiffies + blankinterval);
2577         }
2578
2579         /*
2580          * kmalloc is not running yet - we use the bootmem allocator.
2581          */
2582         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2583                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2584                 visual_init(vc, currcons, 1);
2585                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2586                 vc->vc_kmalloced = 0;
2587                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2588                         currcons || !vc->vc_sw->con_save_screen);
2589         }
2590         currcons = fg_console = 0;
2591         master_display_fg = vc = vc_cons[currcons].d;
2592         set_origin(vc);
2593         save_screen(vc);
2594         gotoxy(vc, vc->vc_x, vc->vc_y);
2595         csi_J(vc, 0);
2596         update_screen(vc);
2597         printk("Console: %s %s %dx%d",
2598                 vc->vc_can_do_color ? "colour" : "mono",
2599                 display_desc, vc->vc_cols, vc->vc_rows);
2600         printable = 1;
2601         printk("\n");
2602
2603         release_console_sem();
2604
2605 #ifdef CONFIG_VT_CONSOLE
2606         register_console(&vt_console_driver);
2607 #endif
2608         return 0;
2609 }
2610 console_initcall(con_init);
2611
2612 static struct tty_operations con_ops = {
2613         .open = con_open,
2614         .close = con_close,
2615         .write = con_write,
2616         .write_room = con_write_room,
2617         .put_char = con_put_char,
2618         .flush_chars = con_flush_chars,
2619         .chars_in_buffer = con_chars_in_buffer,
2620         .ioctl = vt_ioctl,
2621         .stop = con_stop,
2622         .start = con_start,
2623         .throttle = con_throttle,
2624         .unthrottle = con_unthrottle,
2625 };
2626
2627 int __init vty_init(void)
2628 {
2629         vcs_init();
2630
2631         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2632         if (!console_driver)
2633                 panic("Couldn't allocate console driver\n");
2634         console_driver->owner = THIS_MODULE;
2635         console_driver->devfs_name = "vc/";
2636         console_driver->name = "tty";
2637         console_driver->name_base = 1;
2638         console_driver->major = TTY_MAJOR;
2639         console_driver->minor_start = 1;
2640         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2641         console_driver->init_termios = tty_std_termios;
2642         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2643         tty_set_operations(console_driver, &con_ops);
2644         if (tty_register_driver(console_driver))
2645                 panic("Couldn't register console driver\n");
2646
2647         kbd_init();
2648         console_map_init();
2649 #ifdef CONFIG_PROM_CONSOLE
2650         prom_con_init();
2651 #endif
2652 #ifdef CONFIG_MDA_CONSOLE
2653         mda_console_init();
2654 #endif
2655         return 0;
2656 }
2657
2658 #ifndef VT_SINGLE_DRIVER
2659
2660 /*
2661  *      If we support more console drivers, this function is used
2662  *      when a driver wants to take over some existing consoles
2663  *      and become default driver for newly opened ones.
2664  */
2665
2666 int take_over_console(const struct consw *csw, int first, int last, int deflt)
2667 {
2668         int i, j = -1, k = -1;
2669         const char *desc;
2670         struct module *owner;
2671
2672         owner = csw->owner;
2673         if (!try_module_get(owner))
2674                 return -ENODEV;
2675
2676         acquire_console_sem();
2677
2678         desc = csw->con_startup();
2679         if (!desc) {
2680                 release_console_sem();
2681                 module_put(owner);
2682                 return -ENODEV;
2683         }
2684         if (deflt) {
2685                 if (conswitchp)
2686                         module_put(conswitchp->owner);
2687                 __module_get(owner);
2688                 conswitchp = csw;
2689         }
2690
2691         for (i = first; i <= last; i++) {
2692                 int old_was_color;
2693                 struct vc_data *vc = vc_cons[i].d;
2694
2695                 if (con_driver_map[i])
2696                         module_put(con_driver_map[i]->owner);
2697                 __module_get(owner);
2698                 con_driver_map[i] = csw;
2699
2700                 if (!vc || !vc->vc_sw)
2701                         continue;
2702
2703                 j = i;
2704                 if (CON_IS_VISIBLE(vc)) {
2705                         k = i;
2706                         save_screen(vc);
2707                 }
2708
2709                 old_was_color = vc->vc_can_do_color;
2710                 vc->vc_sw->con_deinit(vc);
2711                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2712                 vc->vc_visible_origin = vc->vc_origin;
2713                 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
2714                 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
2715                 visual_init(vc, i, 0);
2716                 update_attr(vc);
2717
2718                 /* If the console changed between mono <-> color, then
2719                  * the attributes in the screenbuf will be wrong.  The
2720                  * following resets all attributes to something sane.
2721                  */
2722                 if (old_was_color != vc->vc_can_do_color)
2723                         clear_buffer_attributes(vc);
2724         }
2725
2726         printk("Console: switching ");
2727         if (!deflt)
2728                 printk("consoles %d-%d ", first+1, last+1);
2729         if (j >= 0) {
2730                 struct vc_data *vc = vc_cons[j].d;
2731
2732                 printk("to %s %s %dx%d\n",
2733                        vc->vc_can_do_color ? "colour" : "mono",
2734                        desc, vc->vc_cols, vc->vc_rows);
2735
2736                 if (k >= 0) {
2737                         vc = vc_cons[k].d;
2738                         update_screen(vc);
2739                 }
2740         } else
2741                 printk("to %s\n", desc);
2742
2743         release_console_sem();
2744
2745         module_put(owner);
2746         return 0;
2747 }
2748
2749 void give_up_console(const struct consw *csw)
2750 {
2751         int i;
2752
2753         for(i = 0; i < MAX_NR_CONSOLES; i++)
2754                 if (con_driver_map[i] == csw) {
2755                         module_put(csw->owner);
2756                         con_driver_map[i] = NULL;
2757                 }
2758 }
2759
2760 #endif
2761
2762 /*
2763  *      Screen blanking
2764  */
2765
2766 static void set_vesa_blanking(char __user *p)
2767 {
2768     unsigned int mode;
2769     get_user(mode, p + 1);
2770     vesa_blank_mode = (mode < 4) ? mode : 0;
2771 }
2772
2773 void do_blank_screen(int entering_gfx)
2774 {
2775         struct vc_data *vc = vc_cons[fg_console].d;
2776         int i;
2777
2778         WARN_CONSOLE_UNLOCKED();
2779
2780         if (console_blanked) {
2781                 if (blank_state == blank_vesa_wait) {
2782                         blank_state = blank_off;
2783                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
2784                 }
2785                 return;
2786         }
2787         if (blank_state != blank_normal_wait)
2788                 return;
2789         blank_state = blank_off;
2790
2791         /* entering graphics mode? */
2792         if (entering_gfx) {
2793                 hide_cursor(vc);
2794                 save_screen(vc);
2795                 vc->vc_sw->con_blank(vc, -1, 1);
2796                 console_blanked = fg_console + 1;
2797                 set_origin(vc);
2798                 return;
2799         }
2800
2801         /* don't blank graphics */
2802         if (vc->vc_mode != KD_TEXT) {
2803                 console_blanked = fg_console + 1;
2804                 return;
2805         }
2806
2807         hide_cursor(vc);
2808         del_timer_sync(&console_timer);
2809         blank_timer_expired = 0;
2810
2811         save_screen(vc);
2812         /* In case we need to reset origin, blanking hook returns 1 */
2813         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
2814         console_blanked = fg_console + 1;
2815         if (i)
2816                 set_origin(vc);
2817
2818         if (console_blank_hook && console_blank_hook(1))
2819                 return;
2820
2821         if (vesa_off_interval && vesa_blank_mode) {
2822                 blank_state = blank_vesa_wait;
2823                 mod_timer(&console_timer, jiffies + vesa_off_interval);
2824         }
2825 }
2826 EXPORT_SYMBOL(do_blank_screen);
2827
2828 /*
2829  * Called by timer as well as from vt_console_driver
2830  */
2831 void do_unblank_screen(int leaving_gfx)
2832 {
2833         struct vc_data *vc;
2834
2835         /* This should now always be called from a "sane" (read: can schedule)
2836          * context for the sake of the low level drivers, except in the special
2837          * case of oops_in_progress
2838          */
2839         if (!oops_in_progress)
2840                 might_sleep();
2841
2842         WARN_CONSOLE_UNLOCKED();
2843
2844         ignore_poke = 0;
2845         if (!console_blanked)
2846                 return;
2847         if (!vc_cons_allocated(fg_console)) {
2848                 /* impossible */
2849                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
2850                 return;
2851         }
2852         vc = vc_cons[fg_console].d;
2853         if (vc->vc_mode != KD_TEXT)
2854                 return; /* but leave console_blanked != 0 */
2855
2856         if (blankinterval) {
2857                 mod_timer(&console_timer, jiffies + blankinterval);
2858                 blank_state = blank_normal_wait;
2859         }
2860
2861         console_blanked = 0;
2862         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
2863                 /* Low-level driver cannot restore -> do it ourselves */
2864                 update_screen(vc);
2865         if (console_blank_hook)
2866                 console_blank_hook(0);
2867         set_palette(vc);
2868         set_cursor(vc);
2869 }
2870 EXPORT_SYMBOL(do_unblank_screen);
2871
2872 /*
2873  * This is called by the outside world to cause a forced unblank, mostly for
2874  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
2875  * call it with 1 as an argument and so force a mode restore... that may kill
2876  * X or at least garbage the screen but would also make the Oops visible...
2877  */
2878 void unblank_screen(void)
2879 {
2880         do_unblank_screen(0);
2881 }
2882
2883 /*
2884  * We defer the timer blanking to work queue so it can take the console mutex
2885  * (console operations can still happen at irq time, but only from printk which
2886  * has the console mutex. Not perfect yet, but better than no locking
2887  */
2888 static void blank_screen_t(unsigned long dummy)
2889 {
2890         if (unlikely(!keventd_up())) {
2891                 mod_timer(&console_timer, jiffies + blankinterval);
2892                 return;
2893         }
2894         blank_timer_expired = 1;
2895         schedule_work(&console_work);
2896 }
2897
2898 void poke_blanked_console(void)
2899 {
2900         WARN_CONSOLE_UNLOCKED();
2901
2902         /* Add this so we quickly catch whoever might call us in a non
2903          * safe context. Nowadays, unblank_screen() isn't to be called in
2904          * atomic contexts and is allowed to schedule (with the special case
2905          * of oops_in_progress, but that isn't of any concern for this
2906          * function. --BenH.
2907          */
2908         might_sleep();
2909
2910         /* This isn't perfectly race free, but a race here would be mostly harmless,
2911          * at worse, we'll do a spurrious blank and it's unlikely
2912          */
2913         del_timer(&console_timer);
2914         blank_timer_expired = 0;
2915
2916         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
2917                 return;
2918         if (console_blanked)
2919                 unblank_screen();
2920         else if (blankinterval) {
2921                 mod_timer(&console_timer, jiffies + blankinterval);
2922                 blank_state = blank_normal_wait;
2923         }
2924 }
2925
2926 /*
2927  *      Palettes
2928  */
2929
2930 static void set_palette(struct vc_data *vc)
2931 {
2932         WARN_CONSOLE_UNLOCKED();
2933
2934         if (vc->vc_mode != KD_GRAPHICS)
2935                 vc->vc_sw->con_set_palette(vc, color_table);
2936 }
2937
2938 static int set_get_cmap(unsigned char __user *arg, int set)
2939 {
2940     int i, j, k;
2941
2942     WARN_CONSOLE_UNLOCKED();
2943
2944     for (i = 0; i < 16; i++)
2945         if (set) {
2946             get_user(default_red[i], arg++);
2947             get_user(default_grn[i], arg++);
2948             get_user(default_blu[i], arg++);
2949         } else {
2950             put_user(default_red[i], arg++);
2951             put_user(default_grn[i], arg++);
2952             put_user(default_blu[i], arg++);
2953         }
2954     if (set) {
2955         for (i = 0; i < MAX_NR_CONSOLES; i++)
2956             if (vc_cons_allocated(i)) {
2957                 for (j = k = 0; j < 16; j++) {
2958                     vc_cons[i].d->vc_palette[k++] = default_red[j];
2959                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
2960                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
2961                 }
2962                 set_palette(vc_cons[i].d);
2963             }
2964     }
2965     return 0;
2966 }
2967
2968 /*
2969  * Load palette into the DAC registers. arg points to a colour
2970  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
2971  */
2972
2973 int con_set_cmap(unsigned char __user *arg)
2974 {
2975         int rc;
2976
2977         acquire_console_sem();
2978         rc = set_get_cmap (arg,1);
2979         release_console_sem();
2980
2981         return rc;
2982 }
2983
2984 int con_get_cmap(unsigned char __user *arg)
2985 {
2986         int rc;
2987
2988         acquire_console_sem();
2989         rc = set_get_cmap (arg,0);
2990         release_console_sem();
2991
2992         return rc;
2993 }
2994
2995 void reset_palette(struct vc_data *vc)
2996 {
2997         int j, k;
2998         for (j=k=0; j<16; j++) {
2999                 vc->vc_palette[k++] = default_red[j];
3000                 vc->vc_palette[k++] = default_grn[j];
3001                 vc->vc_palette[k++] = default_blu[j];
3002         }
3003         set_palette(vc);
3004 }
3005
3006 /*
3007  *  Font switching
3008  *
3009  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3010  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 
3011  *  depending on width) reserved for each character which is kinda wasty, but 
3012  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It 
3013  *  is upto the actual low-level console-driver convert data into its favorite
3014  *  format (maybe we should add a `fontoffset' field to the `display'
3015  *  structure so we won't have to convert the fontdata all the time.
3016  *  /Jes
3017  */
3018
3019 #define max_font_size 65536
3020
3021 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3022 {
3023         struct console_font font;
3024         int rc = -EINVAL;
3025         int c;
3026
3027         if (vc->vc_mode != KD_TEXT)
3028                 return -EINVAL;
3029
3030         if (op->data) {
3031                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3032                 if (!font.data)
3033                         return -ENOMEM;
3034         } else
3035                 font.data = NULL;
3036
3037         acquire_console_sem();
3038         if (vc->vc_sw->con_font_get)
3039                 rc = vc->vc_sw->con_font_get(vc, &font);
3040         else
3041                 rc = -ENOSYS;
3042         release_console_sem();
3043
3044         if (rc)
3045                 goto out;
3046
3047         c = (font.width+7)/8 * 32 * font.charcount;
3048         
3049         if (op->data && font.charcount > op->charcount)
3050                 rc = -ENOSPC;
3051         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3052                 if (font.width > op->width || font.height > op->height) 
3053                         rc = -ENOSPC;
3054         } else {
3055                 if (font.width != 8)
3056                         rc = -EIO;
3057                 else if ((op->height && font.height > op->height) ||
3058                          font.height > 32)
3059                         rc = -ENOSPC;
3060         }
3061         if (rc)
3062                 goto out;
3063
3064         op->height = font.height;
3065         op->width = font.width;
3066         op->charcount = font.charcount;
3067
3068         if (op->data && copy_to_user(op->data, font.data, c))
3069                 rc = -EFAULT;
3070
3071 out:
3072         kfree(font.data);
3073         return rc;
3074 }
3075
3076 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3077 {
3078         struct console_font font;
3079         int rc = -EINVAL;
3080         int size;
3081
3082         if (vc->vc_mode != KD_TEXT)
3083                 return -EINVAL;
3084         if (!op->data)
3085                 return -EINVAL;
3086         if (op->charcount > 512)
3087                 return -EINVAL;
3088         if (!op->height) {              /* Need to guess font height [compat] */
3089                 int h, i;
3090                 u8 __user *charmap = op->data;
3091                 u8 tmp;
3092                 
3093                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3094                    so that we can get rid of this soon */
3095                 if (!(op->flags & KD_FONT_FLAG_OLD))
3096                         return -EINVAL;
3097                 for (h = 32; h > 0; h--)
3098                         for (i = 0; i < op->charcount; i++) {
3099                                 if (get_user(tmp, &charmap[32*i+h-1]))
3100                                         return -EFAULT;
3101                                 if (tmp)
3102                                         goto nonzero;
3103                         }
3104                 return -EINVAL;
3105         nonzero:
3106                 op->height = h;
3107         }
3108         if (op->width <= 0 || op->width > 32 || op->height > 32)
3109                 return -EINVAL;
3110         size = (op->width+7)/8 * 32 * op->charcount;
3111         if (size > max_font_size)
3112                 return -ENOSPC;
3113         font.charcount = op->charcount;
3114         font.height = op->height;
3115         font.width = op->width;
3116         font.data = kmalloc(size, GFP_KERNEL);
3117         if (!font.data)
3118                 return -ENOMEM;
3119         if (copy_from_user(font.data, op->data, size)) {
3120                 kfree(font.data);
3121                 return -EFAULT;
3122         }
3123         acquire_console_sem();
3124         if (vc->vc_sw->con_font_set)
3125                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3126         else
3127                 rc = -ENOSYS;
3128         release_console_sem();
3129         kfree(font.data);
3130         return rc;
3131 }
3132
3133 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3134 {
3135         struct console_font font = {.width = op->width, .height = op->height};
3136         char name[MAX_FONT_NAME];
3137         char *s = name;
3138         int rc;
3139
3140         if (vc->vc_mode != KD_TEXT)
3141                 return -EINVAL;
3142
3143         if (!op->data)
3144                 s = NULL;
3145         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3146                 return -EFAULT;
3147         else
3148                 name[MAX_FONT_NAME - 1] = 0;
3149
3150         acquire_console_sem();
3151         if (vc->vc_sw->con_font_default)
3152                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3153         else
3154                 rc = -ENOSYS;
3155         release_console_sem();
3156         if (!rc) {
3157                 op->width = font.width;
3158                 op->height = font.height;
3159         }
3160         return rc;
3161 }
3162
3163 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3164 {
3165         int con = op->height;
3166         int rc;
3167
3168         if (vc->vc_mode != KD_TEXT)
3169                 return -EINVAL;
3170
3171         acquire_console_sem();
3172         if (!vc->vc_sw->con_font_copy)
3173                 rc = -ENOSYS;
3174         else if (con < 0 || !vc_cons_allocated(con))
3175                 rc = -ENOTTY;
3176         else if (con == vc->vc_num)     /* nothing to do */
3177                 rc = 0;
3178         else
3179                 rc = vc->vc_sw->con_font_copy(vc, con);
3180         release_console_sem();
3181         return rc;
3182 }
3183
3184 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3185 {
3186         switch (op->op) {
3187         case KD_FONT_OP_SET:
3188                 return con_font_set(vc, op);
3189         case KD_FONT_OP_GET:
3190                 return con_font_get(vc, op);
3191         case KD_FONT_OP_SET_DEFAULT:
3192                 return con_font_default(vc, op);
3193         case KD_FONT_OP_COPY:
3194                 return con_font_copy(vc, op);
3195         }
3196         return -ENOSYS;
3197 }
3198
3199 /*
3200  *      Interface exported to selection and vcs.
3201  */
3202
3203 /* used by selection */
3204 u16 screen_glyph(struct vc_data *vc, int offset)
3205 {
3206         u16 w = scr_readw(screenpos(vc, offset, 1));
3207         u16 c = w & 0xff;
3208
3209         if (w & vc->vc_hi_font_mask)
3210                 c |= 0x100;
3211         return c;
3212 }
3213
3214 /* used by vcs - note the word offset */
3215 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3216 {
3217         return screenpos(vc, 2 * w_offset, viewed);
3218 }
3219
3220 void getconsxy(struct vc_data *vc, unsigned char *p)
3221 {
3222         p[0] = vc->vc_x;
3223         p[1] = vc->vc_y;
3224 }
3225
3226 void putconsxy(struct vc_data *vc, unsigned char *p)
3227 {
3228         hide_cursor(vc);
3229         gotoxy(vc, p[0], p[1]);
3230         set_cursor(vc);
3231 }
3232
3233 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3234 {
3235         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3236                 return softcursor_original;
3237         return scr_readw(org);
3238 }
3239
3240 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3241 {
3242         scr_writew(val, org);
3243         if ((unsigned long)org == vc->vc_pos) {
3244                 softcursor_original = -1;
3245                 add_softcursor(vc);
3246         }
3247 }
3248
3249 /*
3250  *      Visible symbols for modules
3251  */
3252
3253 EXPORT_SYMBOL(color_table);
3254 EXPORT_SYMBOL(default_red);
3255 EXPORT_SYMBOL(default_grn);
3256 EXPORT_SYMBOL(default_blu);
3257 EXPORT_SYMBOL(update_region);
3258 EXPORT_SYMBOL(redraw_screen);
3259 EXPORT_SYMBOL(vc_resize);
3260 EXPORT_SYMBOL(fg_console);
3261 EXPORT_SYMBOL(console_blank_hook);
3262 EXPORT_SYMBOL(console_blanked);
3263 EXPORT_SYMBOL(vc_cons);
3264 #ifndef VT_SINGLE_DRIVER
3265 EXPORT_SYMBOL(take_over_console);
3266 EXPORT_SYMBOL(give_up_console);
3267 #endif