Char: vt, use kzalloc
[linux-2.6.git] / drivers / char / vt.c
1 /*
2  *  linux/drivers/char/vt.c
3  *
4  *  Copyright (C) 1991, 1992  Linus Torvalds
5  */
6
7 /*
8  * Hopefully this will be a rather complete VT102 implementation.
9  *
10  * Beeping thanks to John T Kohl.
11  *
12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13  *   Chars, and VT100 enhancements by Peter MacDonald.
14  *
15  * Copy and paste function by Andrew Haylett,
16  *   some enhancements by Alessandro Rubini.
17  *
18  * Code to check for different video-cards mostly by Galen Hunt,
19  * <g-hunt@ee.utah.edu>
20  *
21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23  *
24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25  * Resizing of consoles, aeb, 940926
26  *
27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28  * <poe@daimi.aau.dk>
29  *
30  * User-defined bell sound, new setterm control sequences and printk
31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32  *
33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34  *
35  * Merge with the abstract console driver by Geert Uytterhoeven
36  * <geert@linux-m68k.org>, Jan 1997.
37  *
38  *   Original m68k console driver modifications by
39  *
40  *     - Arno Griffioen <arno@usn.nl>
41  *     - David Carter <carter@cs.bris.ac.uk>
42  * 
43  *   The abstract console driver provides a generic interface for a text
44  *   console. It supports VGA text mode, frame buffer based graphical consoles
45  *   and special graphics processors that are only accessible through some
46  *   registers (e.g. a TMS340x0 GSP).
47  *
48  *   The interface to the hardware is specified using a special structure
49  *   (struct consw) which contains function pointers to console operations
50  *   (see <linux/console.h> for more information).
51  *
52  * Support for changeable cursor shape
53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54  *
55  * Ported to i386 and con_scrolldelta fixed
56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
57  *
58  * Resurrected character buffers in videoram plus lots of other trickery
59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60  *
61  * Removed old-style timers, introduced console_timer, made timer
62  * deletion SMP-safe.  17Jun00, Andrew Morton <andrewm@uow.edu.au>
63  *
64  * Removed console_lock, enabled interrupts across all console operations
65  * 13 March 2001, Andrew Morton
66  *
67  * Fixed UTF-8 mode so alternate charset modes always work according
68  * to control sequences interpreted in do_con_trol function
69  * preserving backward VT100 semigraphics compatibility,
70  * malformed UTF sequences represented as sequences of replacement glyphs,
71  * original codes or '?' as a last resort if replacement glyph is undefined
72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
73  */
74
75 #include <linux/module.h>
76 #include <linux/types.h>
77 #include <linux/sched.h>
78 #include <linux/tty.h>
79 #include <linux/tty_flip.h>
80 #include <linux/kernel.h>
81 #include <linux/string.h>
82 #include <linux/errno.h>
83 #include <linux/kd.h>
84 #include <linux/slab.h>
85 #include <linux/major.h>
86 #include <linux/mm.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/mutex.h>
90 #include <linux/vt_kern.h>
91 #include <linux/selection.h>
92 #include <linux/tiocl.h>
93 #include <linux/kbd_kern.h>
94 #include <linux/consolemap.h>
95 #include <linux/timer.h>
96 #include <linux/interrupt.h>
97 #include <linux/workqueue.h>
98 #include <linux/bootmem.h>
99 #include <linux/pm.h>
100 #include <linux/font.h>
101 #include <linux/bitops.h>
102
103 #include <asm/io.h>
104 #include <asm/system.h>
105 #include <asm/uaccess.h>
106
107 #define MAX_NR_CON_DRIVER 16
108
109 #define CON_DRIVER_FLAG_MODULE 1
110 #define CON_DRIVER_FLAG_INIT   2
111 #define CON_DRIVER_FLAG_ATTR   4
112
113 struct con_driver {
114         const struct consw *con;
115         const char *desc;
116         struct device *dev;
117         int node;
118         int first;
119         int last;
120         int flag;
121 };
122
123 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
124 const struct consw *conswitchp;
125
126 /* A bitmap for codes <32. A bit of 1 indicates that the code
127  * corresponding to that bit number invokes some special action
128  * (such as cursor movement) and should not be displayed as a
129  * glyph unless the disp_ctrl mode is explicitly enabled.
130  */
131 #define CTRL_ACTION 0x0d00ff81
132 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
133
134 /*
135  * Here is the default bell parameters: 750HZ, 1/8th of a second
136  */
137 #define DEFAULT_BELL_PITCH      750
138 #define DEFAULT_BELL_DURATION   (HZ/8)
139
140 struct vc vc_cons [MAX_NR_CONSOLES];
141
142 #ifndef VT_SINGLE_DRIVER
143 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
144 #endif
145
146 static int con_open(struct tty_struct *, struct file *);
147 static void vc_init(struct vc_data *vc, unsigned int rows,
148                     unsigned int cols, int do_clear);
149 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
150 static void save_cur(struct vc_data *vc);
151 static void reset_terminal(struct vc_data *vc, int do_clear);
152 static void con_flush_chars(struct tty_struct *tty);
153 static int set_vesa_blanking(char __user *p);
154 static void set_cursor(struct vc_data *vc);
155 static void hide_cursor(struct vc_data *vc);
156 static void console_callback(struct work_struct *ignored);
157 static void blank_screen_t(unsigned long dummy);
158 static void set_palette(struct vc_data *vc);
159
160 static int printable;           /* Is console ready for printing? */
161 static int default_utf8;
162 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
163
164 /*
165  * ignore_poke: don't unblank the screen when things are typed.  This is
166  * mainly for the privacy of braille terminal users.
167  */
168 static int ignore_poke;
169
170 int do_poke_blanked_console;
171 int console_blanked;
172
173 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
174 static int blankinterval = 10*60*HZ;
175 static int vesa_off_interval;
176
177 static DECLARE_WORK(console_work, console_callback);
178
179 /*
180  * fg_console is the current virtual console,
181  * last_console is the last used one,
182  * want_console is the console we want to switch to,
183  * kmsg_redirect is the console for kernel messages,
184  */
185 int fg_console;
186 int last_console;
187 int want_console = -1;
188 int kmsg_redirect;
189
190 /*
191  * For each existing display, we have a pointer to console currently visible
192  * on that display, allowing consoles other than fg_console to be refreshed
193  * appropriately. Unless the low-level driver supplies its own display_fg
194  * variable, we use this one for the "master display".
195  */
196 static struct vc_data *master_display_fg;
197
198 /*
199  * Unfortunately, we need to delay tty echo when we're currently writing to the
200  * console since the code is (and always was) not re-entrant, so we schedule
201  * all flip requests to process context with schedule-task() and run it from
202  * console_callback().
203  */
204
205 /*
206  * For the same reason, we defer scrollback to the console callback.
207  */
208 static int scrollback_delta;
209
210 /*
211  * Hook so that the power management routines can (un)blank
212  * the console on our behalf.
213  */
214 int (*console_blank_hook)(int);
215
216 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
217 static int blank_state;
218 static int blank_timer_expired;
219 enum {
220         blank_off = 0,
221         blank_normal_wait,
222         blank_vesa_wait,
223 };
224
225 /*
226  *      Low-Level Functions
227  */
228
229 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
230
231 #ifdef VT_BUF_VRAM_ONLY
232 #define DO_UPDATE(vc)   0
233 #else
234 #define DO_UPDATE(vc)   CON_IS_VISIBLE(vc)
235 #endif
236
237 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
238 {
239         unsigned short *p;
240         
241         if (!viewed)
242                 p = (unsigned short *)(vc->vc_origin + offset);
243         else if (!vc->vc_sw->con_screen_pos)
244                 p = (unsigned short *)(vc->vc_visible_origin + offset);
245         else
246                 p = vc->vc_sw->con_screen_pos(vc, offset);
247         return p;
248 }
249
250 static inline void scrolldelta(int lines)
251 {
252         scrollback_delta += lines;
253         schedule_console_callback();
254 }
255
256 void schedule_console_callback(void)
257 {
258         schedule_work(&console_work);
259 }
260
261 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
262 {
263         unsigned short *d, *s;
264
265         if (t+nr >= b)
266                 nr = b - t - 1;
267         if (b > vc->vc_rows || t >= b || nr < 1)
268                 return;
269         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
270                 return;
271         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
272         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
273         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
274         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
275                     vc->vc_size_row * nr);
276 }
277
278 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
279 {
280         unsigned short *s;
281         unsigned int step;
282
283         if (t+nr >= b)
284                 nr = b - t - 1;
285         if (b > vc->vc_rows || t >= b || nr < 1)
286                 return;
287         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
288                 return;
289         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
290         step = vc->vc_cols * nr;
291         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
292         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
293 }
294
295 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
296 {
297 #ifndef VT_BUF_VRAM_ONLY
298         unsigned int xx, yy, offset;
299         u16 *p;
300
301         p = (u16 *) start;
302         if (!vc->vc_sw->con_getxy) {
303                 offset = (start - vc->vc_origin) / 2;
304                 xx = offset % vc->vc_cols;
305                 yy = offset / vc->vc_cols;
306         } else {
307                 int nxx, nyy;
308                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
309                 xx = nxx; yy = nyy;
310         }
311         for(;;) {
312                 u16 attrib = scr_readw(p) & 0xff00;
313                 int startx = xx;
314                 u16 *q = p;
315                 while (xx < vc->vc_cols && count) {
316                         if (attrib != (scr_readw(p) & 0xff00)) {
317                                 if (p > q)
318                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
319                                 startx = xx;
320                                 q = p;
321                                 attrib = scr_readw(p) & 0xff00;
322                         }
323                         p++;
324                         xx++;
325                         count--;
326                 }
327                 if (p > q)
328                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
329                 if (!count)
330                         break;
331                 xx = 0;
332                 yy++;
333                 if (vc->vc_sw->con_getxy) {
334                         p = (u16 *)start;
335                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
336                 }
337         }
338 #endif
339 }
340
341 void update_region(struct vc_data *vc, unsigned long start, int count)
342 {
343         WARN_CONSOLE_UNLOCKED();
344
345         if (DO_UPDATE(vc)) {
346                 hide_cursor(vc);
347                 do_update_region(vc, start, count);
348                 set_cursor(vc);
349         }
350 }
351
352 /* Structure of attributes is hardware-dependent */
353
354 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
355     u8 _underline, u8 _reverse, u8 _italic)
356 {
357         if (vc->vc_sw->con_build_attr)
358                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
359                        _blink, _underline, _reverse, _italic);
360
361 #ifndef VT_BUF_VRAM_ONLY
362 /*
363  * ++roman: I completely changed the attribute format for monochrome
364  * mode (!can_do_color). The formerly used MDA (monochrome display
365  * adapter) format didn't allow the combination of certain effects.
366  * Now the attribute is just a bit vector:
367  *  Bit 0..1: intensity (0..2)
368  *  Bit 2   : underline
369  *  Bit 3   : reverse
370  *  Bit 7   : blink
371  */
372         {
373         u8 a = vc->vc_color;
374         if (!vc->vc_can_do_color)
375                 return _intensity |
376                        (_italic ? 2 : 0) |
377                        (_underline ? 4 : 0) |
378                        (_reverse ? 8 : 0) |
379                        (_blink ? 0x80 : 0);
380         if (_italic)
381                 a = (a & 0xF0) | vc->vc_itcolor;
382         else if (_underline)
383                 a = (a & 0xf0) | vc->vc_ulcolor;
384         else if (_intensity == 0)
385                 a = (a & 0xf0) | vc->vc_ulcolor;
386         if (_reverse)
387                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
388         if (_blink)
389                 a ^= 0x80;
390         if (_intensity == 2)
391                 a ^= 0x08;
392         if (vc->vc_hi_font_mask == 0x100)
393                 a <<= 1;
394         return a;
395         }
396 #else
397         return 0;
398 #endif
399 }
400
401 static void update_attr(struct vc_data *vc)
402 {
403         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
404                       vc->vc_blink, vc->vc_underline,
405                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
406         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
407 }
408
409 /* Note: inverting the screen twice should revert to the original state */
410 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
411 {
412         unsigned short *p;
413
414         WARN_CONSOLE_UNLOCKED();
415
416         count /= 2;
417         p = screenpos(vc, offset, viewed);
418         if (vc->vc_sw->con_invert_region)
419                 vc->vc_sw->con_invert_region(vc, p, count);
420 #ifndef VT_BUF_VRAM_ONLY
421         else {
422                 u16 *q = p;
423                 int cnt = count;
424                 u16 a;
425
426                 if (!vc->vc_can_do_color) {
427                         while (cnt--) {
428                             a = scr_readw(q);
429                             a ^= 0x0800;
430                             scr_writew(a, q);
431                             q++;
432                         }
433                 } else if (vc->vc_hi_font_mask == 0x100) {
434                         while (cnt--) {
435                                 a = scr_readw(q);
436                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
437                                 scr_writew(a, q);
438                                 q++;
439                         }
440                 } else {
441                         while (cnt--) {
442                                 a = scr_readw(q);
443                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
444                                 scr_writew(a, q);
445                                 q++;
446                         }
447                 }
448         }
449 #endif
450         if (DO_UPDATE(vc))
451                 do_update_region(vc, (unsigned long) p, count);
452 }
453
454 /* used by selection: complement pointer position */
455 void complement_pos(struct vc_data *vc, int offset)
456 {
457         static int old_offset = -1;
458         static unsigned short old;
459         static unsigned short oldx, oldy;
460
461         WARN_CONSOLE_UNLOCKED();
462
463         if (old_offset != -1 && old_offset >= 0 &&
464             old_offset < vc->vc_screenbuf_size) {
465                 scr_writew(old, screenpos(vc, old_offset, 1));
466                 if (DO_UPDATE(vc))
467                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
468         }
469
470         old_offset = offset;
471
472         if (offset != -1 && offset >= 0 &&
473             offset < vc->vc_screenbuf_size) {
474                 unsigned short new;
475                 unsigned short *p;
476                 p = screenpos(vc, offset, 1);
477                 old = scr_readw(p);
478                 new = old ^ vc->vc_complement_mask;
479                 scr_writew(new, p);
480                 if (DO_UPDATE(vc)) {
481                         oldx = (offset >> 1) % vc->vc_cols;
482                         oldy = (offset >> 1) / vc->vc_cols;
483                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
484                 }
485         }
486
487 }
488
489 static void insert_char(struct vc_data *vc, unsigned int nr)
490 {
491         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
492
493         p = q + vc->vc_cols - nr - vc->vc_x;
494         while (--p >= q)
495                 scr_writew(scr_readw(p), p + nr);
496         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
497         vc->vc_need_wrap = 0;
498         if (DO_UPDATE(vc)) {
499                 unsigned short oldattr = vc->vc_attr;
500                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
501                                      vc->vc_cols - vc->vc_x - nr);
502                 vc->vc_attr = vc->vc_video_erase_char >> 8;
503                 while (nr--)
504                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
505                 vc->vc_attr = oldattr;
506         }
507 }
508
509 static void delete_char(struct vc_data *vc, unsigned int nr)
510 {
511         unsigned int i = vc->vc_x;
512         unsigned short *p = (unsigned short *)vc->vc_pos;
513
514         while (++i <= vc->vc_cols - nr) {
515                 scr_writew(scr_readw(p+nr), p);
516                 p++;
517         }
518         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
519         vc->vc_need_wrap = 0;
520         if (DO_UPDATE(vc)) {
521                 unsigned short oldattr = vc->vc_attr;
522                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
523                                      vc->vc_cols - vc->vc_x - nr);
524                 vc->vc_attr = vc->vc_video_erase_char >> 8;
525                 while (nr--)
526                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
527                                      vc->vc_cols - 1 - nr);
528                 vc->vc_attr = oldattr;
529         }
530 }
531
532 static int softcursor_original;
533
534 static void add_softcursor(struct vc_data *vc)
535 {
536         int i = scr_readw((u16 *) vc->vc_pos);
537         u32 type = vc->vc_cursor_type;
538
539         if (! (type & 0x10)) return;
540         if (softcursor_original != -1) return;
541         softcursor_original = i;
542         i |= ((type >> 8) & 0xff00 );
543         i ^= ((type) & 0xff00 );
544         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
545         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
546         scr_writew(i, (u16 *) vc->vc_pos);
547         if (DO_UPDATE(vc))
548                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
549 }
550
551 static void hide_softcursor(struct vc_data *vc)
552 {
553         if (softcursor_original != -1) {
554                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
555                 if (DO_UPDATE(vc))
556                         vc->vc_sw->con_putc(vc, softcursor_original,
557                                         vc->vc_y, vc->vc_x);
558                 softcursor_original = -1;
559         }
560 }
561
562 static void hide_cursor(struct vc_data *vc)
563 {
564         if (vc == sel_cons)
565                 clear_selection();
566         vc->vc_sw->con_cursor(vc, CM_ERASE);
567         hide_softcursor(vc);
568 }
569
570 static void set_cursor(struct vc_data *vc)
571 {
572         if (!IS_FG(vc) || console_blanked ||
573             vc->vc_mode == KD_GRAPHICS)
574                 return;
575         if (vc->vc_deccm) {
576                 if (vc == sel_cons)
577                         clear_selection();
578                 add_softcursor(vc);
579                 if ((vc->vc_cursor_type & 0x0f) != 1)
580                         vc->vc_sw->con_cursor(vc, CM_DRAW);
581         } else
582                 hide_cursor(vc);
583 }
584
585 static void set_origin(struct vc_data *vc)
586 {
587         WARN_CONSOLE_UNLOCKED();
588
589         if (!CON_IS_VISIBLE(vc) ||
590             !vc->vc_sw->con_set_origin ||
591             !vc->vc_sw->con_set_origin(vc))
592                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
593         vc->vc_visible_origin = vc->vc_origin;
594         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
595         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
596 }
597
598 static inline void save_screen(struct vc_data *vc)
599 {
600         WARN_CONSOLE_UNLOCKED();
601
602         if (vc->vc_sw->con_save_screen)
603                 vc->vc_sw->con_save_screen(vc);
604 }
605
606 /*
607  *      Redrawing of screen
608  */
609
610 static void clear_buffer_attributes(struct vc_data *vc)
611 {
612         unsigned short *p = (unsigned short *)vc->vc_origin;
613         int count = vc->vc_screenbuf_size / 2;
614         int mask = vc->vc_hi_font_mask | 0xff;
615
616         for (; count > 0; count--, p++) {
617                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
618         }
619 }
620
621 void redraw_screen(struct vc_data *vc, int is_switch)
622 {
623         int redraw = 0;
624
625         WARN_CONSOLE_UNLOCKED();
626
627         if (!vc) {
628                 /* strange ... */
629                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
630                 return;
631         }
632
633         if (is_switch) {
634                 struct vc_data *old_vc = vc_cons[fg_console].d;
635                 if (old_vc == vc)
636                         return;
637                 if (!CON_IS_VISIBLE(vc))
638                         redraw = 1;
639                 *vc->vc_display_fg = vc;
640                 fg_console = vc->vc_num;
641                 hide_cursor(old_vc);
642                 if (!CON_IS_VISIBLE(old_vc)) {
643                         save_screen(old_vc);
644                         set_origin(old_vc);
645                 }
646         } else {
647                 hide_cursor(vc);
648                 redraw = 1;
649         }
650
651         if (redraw) {
652                 int update;
653                 int old_was_color = vc->vc_can_do_color;
654
655                 set_origin(vc);
656                 update = vc->vc_sw->con_switch(vc);
657                 set_palette(vc);
658                 /*
659                  * If console changed from mono<->color, the best we can do
660                  * is to clear the buffer attributes. As it currently stands,
661                  * rebuilding new attributes from the old buffer is not doable
662                  * without overly complex code.
663                  */
664                 if (old_was_color != vc->vc_can_do_color) {
665                         update_attr(vc);
666                         clear_buffer_attributes(vc);
667                 }
668                 if (update && vc->vc_mode != KD_GRAPHICS)
669                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
670         }
671         set_cursor(vc);
672         if (is_switch) {
673                 set_leds();
674                 compute_shiftstate();
675         }
676 }
677
678 /*
679  *      Allocation, freeing and resizing of VTs.
680  */
681
682 int vc_cons_allocated(unsigned int i)
683 {
684         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
685 }
686
687 static void visual_init(struct vc_data *vc, int num, int init)
688 {
689         /* ++Geert: vc->vc_sw->con_init determines console size */
690         if (vc->vc_sw)
691                 module_put(vc->vc_sw->owner);
692         vc->vc_sw = conswitchp;
693 #ifndef VT_SINGLE_DRIVER
694         if (con_driver_map[num])
695                 vc->vc_sw = con_driver_map[num];
696 #endif
697         __module_get(vc->vc_sw->owner);
698         vc->vc_num = num;
699         vc->vc_display_fg = &master_display_fg;
700         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
701         vc->vc_uni_pagedir = 0;
702         vc->vc_hi_font_mask = 0;
703         vc->vc_complement_mask = 0;
704         vc->vc_can_do_color = 0;
705         vc->vc_sw->con_init(vc, init);
706         if (!vc->vc_complement_mask)
707                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
708         vc->vc_s_complement_mask = vc->vc_complement_mask;
709         vc->vc_size_row = vc->vc_cols << 1;
710         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
711 }
712
713 int vc_allocate(unsigned int currcons)  /* return 0 on success */
714 {
715         WARN_CONSOLE_UNLOCKED();
716
717         if (currcons >= MAX_NR_CONSOLES)
718                 return -ENXIO;
719         if (!vc_cons[currcons].d) {
720             struct vc_data *vc;
721
722             /* prevent users from taking too much memory */
723             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
724               return -EPERM;
725
726             /* due to the granularity of kmalloc, we waste some memory here */
727             /* the alloc is done in two steps, to optimize the common situation
728                of a 25x80 console (structsize=216, screenbuf_size=4000) */
729             /* although the numbers above are not valid since long ago, the
730                point is still up-to-date and the comment still has its value
731                even if only as a historical artifact.  --mj, July 1998 */
732             vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
733             if (!vc)
734                 return -ENOMEM;
735             vc_cons[currcons].d = vc;
736             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
737             visual_init(vc, currcons, 1);
738             if (!*vc->vc_uni_pagedir_loc)
739                 con_set_default_unimap(vc);
740             if (!vc->vc_kmalloced)
741                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
742             if (!vc->vc_screenbuf) {
743                 kfree(vc);
744                 vc_cons[currcons].d = NULL;
745                 return -ENOMEM;
746             }
747             vc->vc_kmalloced = 1;
748             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
749         }
750         return 0;
751 }
752
753 static inline int resize_screen(struct vc_data *vc, int width, int height)
754 {
755         /* Resizes the resolution of the display adapater */
756         int err = 0;
757
758         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
759                 err = vc->vc_sw->con_resize(vc, width, height);
760         return err;
761 }
762
763 /*
764  * Change # of rows and columns (0 means unchanged/the size of fg_console)
765  * [this is to be used together with some user program
766  * like resize that changes the hardware videomode]
767  */
768 #define VC_RESIZE_MAXCOL (32767)
769 #define VC_RESIZE_MAXROW (32767)
770 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
771 {
772         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
773         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
774         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
775         unsigned int end;
776         unsigned short *newscreen;
777
778         WARN_CONSOLE_UNLOCKED();
779
780         if (!vc)
781                 return -ENXIO;
782
783         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
784                 return -EINVAL;
785
786         new_cols = (cols ? cols : vc->vc_cols);
787         new_rows = (lines ? lines : vc->vc_rows);
788         new_row_size = new_cols << 1;
789         new_screen_size = new_row_size * new_rows;
790
791         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
792                 return 0;
793
794         newscreen = kmalloc(new_screen_size, GFP_USER);
795         if (!newscreen)
796                 return -ENOMEM;
797
798         old_rows = vc->vc_rows;
799         old_cols = vc->vc_cols;
800         old_row_size = vc->vc_size_row;
801         old_screen_size = vc->vc_screenbuf_size;
802
803         err = resize_screen(vc, new_cols, new_rows);
804         if (err) {
805                 kfree(newscreen);
806                 return err;
807         }
808
809         vc->vc_rows = new_rows;
810         vc->vc_cols = new_cols;
811         vc->vc_size_row = new_row_size;
812         vc->vc_screenbuf_size = new_screen_size;
813
814         rlth = min(old_row_size, new_row_size);
815         rrem = new_row_size - rlth;
816         old_origin = vc->vc_origin;
817         new_origin = (long) newscreen;
818         new_scr_end = new_origin + new_screen_size;
819
820         if (vc->vc_y > new_rows) {
821                 if (old_rows - vc->vc_y < new_rows) {
822                         /*
823                          * Cursor near the bottom, copy contents from the
824                          * bottom of buffer
825                          */
826                         old_origin += (old_rows - new_rows) * old_row_size;
827                         end = vc->vc_scr_end;
828                 } else {
829                         /*
830                          * Cursor is in no man's land, copy 1/2 screenful
831                          * from the top and bottom of cursor position
832                          */
833                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
834                         end = old_origin + (old_row_size * new_rows);
835                 }
836         } else
837                 /*
838                  * Cursor near the top, copy contents from the top of buffer
839                  */
840                 end = (old_rows > new_rows) ? old_origin +
841                         (old_row_size * new_rows) :
842                         vc->vc_scr_end;
843
844         update_attr(vc);
845
846         while (old_origin < end) {
847                 scr_memcpyw((unsigned short *) new_origin,
848                             (unsigned short *) old_origin, rlth);
849                 if (rrem)
850                         scr_memsetw((void *)(new_origin + rlth),
851                                     vc->vc_video_erase_char, rrem);
852                 old_origin += old_row_size;
853                 new_origin += new_row_size;
854         }
855         if (new_scr_end > new_origin)
856                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
857                             new_scr_end - new_origin);
858         if (vc->vc_kmalloced)
859                 kfree(vc->vc_screenbuf);
860         vc->vc_screenbuf = newscreen;
861         vc->vc_kmalloced = 1;
862         vc->vc_screenbuf_size = new_screen_size;
863         set_origin(vc);
864
865         /* do part of a reset_terminal() */
866         vc->vc_top = 0;
867         vc->vc_bottom = vc->vc_rows;
868         gotoxy(vc, vc->vc_x, vc->vc_y);
869         save_cur(vc);
870
871         if (vc->vc_tty) {
872                 struct winsize ws, *cws = &vc->vc_tty->winsize;
873
874                 memset(&ws, 0, sizeof(ws));
875                 ws.ws_row = vc->vc_rows;
876                 ws.ws_col = vc->vc_cols;
877                 ws.ws_ypixel = vc->vc_scan_lines;
878                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
879                     vc->vc_tty->pgrp)
880                         kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
881                 *cws = ws;
882         }
883
884         if (CON_IS_VISIBLE(vc))
885                 update_screen(vc);
886         return err;
887 }
888
889 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
890 {
891         int rc;
892
893         acquire_console_sem();
894         rc = vc_resize(vc, cols, lines);
895         release_console_sem();
896         return rc;
897 }
898
899 void vc_deallocate(unsigned int currcons)
900 {
901         WARN_CONSOLE_UNLOCKED();
902
903         if (vc_cons_allocated(currcons)) {
904                 struct vc_data *vc = vc_cons[currcons].d;
905                 vc->vc_sw->con_deinit(vc);
906                 put_pid(vc->vt_pid);
907                 module_put(vc->vc_sw->owner);
908                 if (vc->vc_kmalloced)
909                         kfree(vc->vc_screenbuf);
910                 if (currcons >= MIN_NR_CONSOLES)
911                         kfree(vc);
912                 vc_cons[currcons].d = NULL;
913         }
914 }
915
916 /*
917  *      VT102 emulator
918  */
919
920 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
921 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
922 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
923
924 #define decarm          VC_REPEAT
925 #define decckm          VC_CKMODE
926 #define kbdapplic       VC_APPLIC
927 #define lnm             VC_CRLF
928
929 /*
930  * this is what the terminal answers to a ESC-Z or csi0c query.
931  */
932 #define VT100ID "\033[?1;2c"
933 #define VT102ID "\033[?6c"
934
935 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
936                                        8,12,10,14, 9,13,11,15 };
937
938 /* the default colour table, for VGA+ colour systems */
939 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
940     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
941 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
942     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
943 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
944     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
945
946 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
947 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
948 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
949
950 /*
951  * gotoxy() must verify all boundaries, because the arguments
952  * might also be negative. If the given position is out of
953  * bounds, the cursor is placed at the nearest margin.
954  */
955 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
956 {
957         int min_y, max_y;
958
959         if (new_x < 0)
960                 vc->vc_x = 0;
961         else {
962                 if (new_x >= vc->vc_cols)
963                         vc->vc_x = vc->vc_cols - 1;
964                 else
965                         vc->vc_x = new_x;
966         }
967
968         if (vc->vc_decom) {
969                 min_y = vc->vc_top;
970                 max_y = vc->vc_bottom;
971         } else {
972                 min_y = 0;
973                 max_y = vc->vc_rows;
974         }
975         if (new_y < min_y)
976                 vc->vc_y = min_y;
977         else if (new_y >= max_y)
978                 vc->vc_y = max_y - 1;
979         else
980                 vc->vc_y = new_y;
981         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
982         vc->vc_need_wrap = 0;
983 }
984
985 /* for absolute user moves, when decom is set */
986 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
987 {
988         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
989 }
990
991 void scrollback(struct vc_data *vc, int lines)
992 {
993         if (!lines)
994                 lines = vc->vc_rows / 2;
995         scrolldelta(-lines);
996 }
997
998 void scrollfront(struct vc_data *vc, int lines)
999 {
1000         if (!lines)
1001                 lines = vc->vc_rows / 2;
1002         scrolldelta(lines);
1003 }
1004
1005 static void lf(struct vc_data *vc)
1006 {
1007         /* don't scroll if above bottom of scrolling region, or
1008          * if below scrolling region
1009          */
1010         if (vc->vc_y + 1 == vc->vc_bottom)
1011                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1012         else if (vc->vc_y < vc->vc_rows - 1) {
1013                 vc->vc_y++;
1014                 vc->vc_pos += vc->vc_size_row;
1015         }
1016         vc->vc_need_wrap = 0;
1017 }
1018
1019 static void ri(struct vc_data *vc)
1020 {
1021         /* don't scroll if below top of scrolling region, or
1022          * if above scrolling region
1023          */
1024         if (vc->vc_y == vc->vc_top)
1025                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1026         else if (vc->vc_y > 0) {
1027                 vc->vc_y--;
1028                 vc->vc_pos -= vc->vc_size_row;
1029         }
1030         vc->vc_need_wrap = 0;
1031 }
1032
1033 static inline void cr(struct vc_data *vc)
1034 {
1035         vc->vc_pos -= vc->vc_x << 1;
1036         vc->vc_need_wrap = vc->vc_x = 0;
1037 }
1038
1039 static inline void bs(struct vc_data *vc)
1040 {
1041         if (vc->vc_x) {
1042                 vc->vc_pos -= 2;
1043                 vc->vc_x--;
1044                 vc->vc_need_wrap = 0;
1045         }
1046 }
1047
1048 static inline void del(struct vc_data *vc)
1049 {
1050         /* ignored */
1051 }
1052
1053 static void csi_J(struct vc_data *vc, int vpar)
1054 {
1055         unsigned int count;
1056         unsigned short * start;
1057
1058         switch (vpar) {
1059                 case 0: /* erase from cursor to end of display */
1060                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1061                         start = (unsigned short *)vc->vc_pos;
1062                         if (DO_UPDATE(vc)) {
1063                                 /* do in two stages */
1064                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1065                                               vc->vc_cols - vc->vc_x);
1066                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1067                                               vc->vc_rows - vc->vc_y - 1,
1068                                               vc->vc_cols);
1069                         }
1070                         break;
1071                 case 1: /* erase from start to cursor */
1072                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1073                         start = (unsigned short *)vc->vc_origin;
1074                         if (DO_UPDATE(vc)) {
1075                                 /* do in two stages */
1076                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1077                                               vc->vc_cols);
1078                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1079                                               vc->vc_x + 1);
1080                         }
1081                         break;
1082                 case 2: /* erase whole display */
1083                         count = vc->vc_cols * vc->vc_rows;
1084                         start = (unsigned short *)vc->vc_origin;
1085                         if (DO_UPDATE(vc))
1086                                 vc->vc_sw->con_clear(vc, 0, 0,
1087                                               vc->vc_rows,
1088                                               vc->vc_cols);
1089                         break;
1090                 default:
1091                         return;
1092         }
1093         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1094         vc->vc_need_wrap = 0;
1095 }
1096
1097 static void csi_K(struct vc_data *vc, int vpar)
1098 {
1099         unsigned int count;
1100         unsigned short * start;
1101
1102         switch (vpar) {
1103                 case 0: /* erase from cursor to end of line */
1104                         count = vc->vc_cols - vc->vc_x;
1105                         start = (unsigned short *)vc->vc_pos;
1106                         if (DO_UPDATE(vc))
1107                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1108                                                      vc->vc_cols - vc->vc_x);
1109                         break;
1110                 case 1: /* erase from start of line to cursor */
1111                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1112                         count = vc->vc_x + 1;
1113                         if (DO_UPDATE(vc))
1114                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1115                                                      vc->vc_x + 1);
1116                         break;
1117                 case 2: /* erase whole line */
1118                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1119                         count = vc->vc_cols;
1120                         if (DO_UPDATE(vc))
1121                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1122                                               vc->vc_cols);
1123                         break;
1124                 default:
1125                         return;
1126         }
1127         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1128         vc->vc_need_wrap = 0;
1129 }
1130
1131 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1132 {                                         /* not vt100? */
1133         int count;
1134
1135         if (!vpar)
1136                 vpar++;
1137         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1138
1139         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1140         if (DO_UPDATE(vc))
1141                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1142         vc->vc_need_wrap = 0;
1143 }
1144
1145 static void default_attr(struct vc_data *vc)
1146 {
1147         vc->vc_intensity = 1;
1148         vc->vc_italic = 0;
1149         vc->vc_underline = 0;
1150         vc->vc_reverse = 0;
1151         vc->vc_blink = 0;
1152         vc->vc_color = vc->vc_def_color;
1153 }
1154
1155 /* console_sem is held */
1156 static void csi_m(struct vc_data *vc)
1157 {
1158         int i;
1159
1160         for (i = 0; i <= vc->vc_npar; i++)
1161                 switch (vc->vc_par[i]) {
1162                         case 0: /* all attributes off */
1163                                 default_attr(vc);
1164                                 break;
1165                         case 1:
1166                                 vc->vc_intensity = 2;
1167                                 break;
1168                         case 2:
1169                                 vc->vc_intensity = 0;
1170                                 break;
1171                         case 3:
1172                                 vc->vc_italic = 1;
1173                                 break;
1174                         case 4:
1175                                 vc->vc_underline = 1;
1176                                 break;
1177                         case 5:
1178                                 vc->vc_blink = 1;
1179                                 break;
1180                         case 7:
1181                                 vc->vc_reverse = 1;
1182                                 break;
1183                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1184                                   * Select primary font, don't display
1185                                   * control chars if defined, don't set
1186                                   * bit 8 on output.
1187                                   */
1188                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1189                                                 ? vc->vc_G0_charset
1190                                                 : vc->vc_G1_charset, vc);
1191                                 vc->vc_disp_ctrl = 0;
1192                                 vc->vc_toggle_meta = 0;
1193                                 break;
1194                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1195                                   * Select first alternate font, lets
1196                                   * chars < 32 be displayed as ROM chars.
1197                                   */
1198                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1199                                 vc->vc_disp_ctrl = 1;
1200                                 vc->vc_toggle_meta = 0;
1201                                 break;
1202                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1203                                   * Select second alternate font, toggle
1204                                   * high bit before displaying as ROM char.
1205                                   */
1206                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1207                                 vc->vc_disp_ctrl = 1;
1208                                 vc->vc_toggle_meta = 1;
1209                                 break;
1210                         case 21:
1211                         case 22:
1212                                 vc->vc_intensity = 1;
1213                                 break;
1214                         case 23:
1215                                 vc->vc_italic = 0;
1216                                 break;
1217                         case 24:
1218                                 vc->vc_underline = 0;
1219                                 break;
1220                         case 25:
1221                                 vc->vc_blink = 0;
1222                                 break;
1223                         case 27:
1224                                 vc->vc_reverse = 0;
1225                                 break;
1226                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1227                                   * Enables underscore, white foreground
1228                                   * with white underscore (Linux - use
1229                                   * default foreground).
1230                                   */
1231                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1232                                 vc->vc_underline = 1;
1233                                 break;
1234                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1235                                   * Disable underline option.
1236                                   * Reset colour to default? It did this
1237                                   * before...
1238                                   */
1239                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1240                                 vc->vc_underline = 0;
1241                                 break;
1242                         case 49:
1243                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1244                                 break;
1245                         default:
1246                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1247                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1248                                                 | (vc->vc_color & 0xf0);
1249                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1250                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1251                                                 | (vc->vc_color & 0x0f);
1252                                 break;
1253                 }
1254         update_attr(vc);
1255 }
1256
1257 static void respond_string(const char *p, struct tty_struct *tty)
1258 {
1259         while (*p) {
1260                 tty_insert_flip_char(tty, *p, 0);
1261                 p++;
1262         }
1263         con_schedule_flip(tty);
1264 }
1265
1266 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1267 {
1268         char buf[40];
1269
1270         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1271         respond_string(buf, tty);
1272 }
1273
1274 static inline void status_report(struct tty_struct *tty)
1275 {
1276         respond_string("\033[0n", tty); /* Terminal ok */
1277 }
1278
1279 static inline void respond_ID(struct tty_struct * tty)
1280 {
1281         respond_string(VT102ID, tty);
1282 }
1283
1284 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1285 {
1286         char buf[8];
1287
1288         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1289                 (char)('!' + mry));
1290         respond_string(buf, tty);
1291 }
1292
1293 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1294 int mouse_reporting(void)
1295 {
1296         return vc_cons[fg_console].d->vc_report_mouse;
1297 }
1298
1299 /* console_sem is held */
1300 static void set_mode(struct vc_data *vc, int on_off)
1301 {
1302         int i;
1303
1304         for (i = 0; i <= vc->vc_npar; i++)
1305                 if (vc->vc_ques) {
1306                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1307                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1308                                 if (on_off)
1309                                         set_kbd(vc, decckm);
1310                                 else
1311                                         clr_kbd(vc, decckm);
1312                                 break;
1313                         case 3: /* 80/132 mode switch unimplemented */
1314                                 vc->vc_deccolm = on_off;
1315 #if 0
1316                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1317                                 /* this alone does not suffice; some user mode
1318                                    utility has to change the hardware regs */
1319 #endif
1320                                 break;
1321                         case 5:                 /* Inverted screen on/off */
1322                                 if (vc->vc_decscnm != on_off) {
1323                                         vc->vc_decscnm = on_off;
1324                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1325                                         update_attr(vc);
1326                                 }
1327                                 break;
1328                         case 6:                 /* Origin relative/absolute */
1329                                 vc->vc_decom = on_off;
1330                                 gotoxay(vc, 0, 0);
1331                                 break;
1332                         case 7:                 /* Autowrap on/off */
1333                                 vc->vc_decawm = on_off;
1334                                 break;
1335                         case 8:                 /* Autorepeat on/off */
1336                                 if (on_off)
1337                                         set_kbd(vc, decarm);
1338                                 else
1339                                         clr_kbd(vc, decarm);
1340                                 break;
1341                         case 9:
1342                                 vc->vc_report_mouse = on_off ? 1 : 0;
1343                                 break;
1344                         case 25:                /* Cursor on/off */
1345                                 vc->vc_deccm = on_off;
1346                                 break;
1347                         case 1000:
1348                                 vc->vc_report_mouse = on_off ? 2 : 0;
1349                                 break;
1350                         }
1351                 } else {
1352                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1353                         case 3:                 /* Monitor (display ctrls) */
1354                                 vc->vc_disp_ctrl = on_off;
1355                                 break;
1356                         case 4:                 /* Insert Mode on/off */
1357                                 vc->vc_decim = on_off;
1358                                 break;
1359                         case 20:                /* Lf, Enter == CrLf/Lf */
1360                                 if (on_off)
1361                                         set_kbd(vc, lnm);
1362                                 else
1363                                         clr_kbd(vc, lnm);
1364                                 break;
1365                         }
1366                 }
1367 }
1368
1369 /* console_sem is held */
1370 static void setterm_command(struct vc_data *vc)
1371 {
1372         switch(vc->vc_par[0]) {
1373                 case 1: /* set color for underline mode */
1374                         if (vc->vc_can_do_color &&
1375                                         vc->vc_par[1] < 16) {
1376                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1377                                 if (vc->vc_underline)
1378                                         update_attr(vc);
1379                         }
1380                         break;
1381                 case 2: /* set color for half intensity mode */
1382                         if (vc->vc_can_do_color &&
1383                                         vc->vc_par[1] < 16) {
1384                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1385                                 if (vc->vc_intensity == 0)
1386                                         update_attr(vc);
1387                         }
1388                         break;
1389                 case 8: /* store colors as defaults */
1390                         vc->vc_def_color = vc->vc_attr;
1391                         if (vc->vc_hi_font_mask == 0x100)
1392                                 vc->vc_def_color >>= 1;
1393                         default_attr(vc);
1394                         update_attr(vc);
1395                         break;
1396                 case 9: /* set blanking interval */
1397                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1398                         poke_blanked_console();
1399                         break;
1400                 case 10: /* set bell frequency in Hz */
1401                         if (vc->vc_npar >= 1)
1402                                 vc->vc_bell_pitch = vc->vc_par[1];
1403                         else
1404                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1405                         break;
1406                 case 11: /* set bell duration in msec */
1407                         if (vc->vc_npar >= 1)
1408                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1409                                         vc->vc_par[1] * HZ / 1000 : 0;
1410                         else
1411                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1412                         break;
1413                 case 12: /* bring specified console to the front */
1414                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1415                                 set_console(vc->vc_par[1] - 1);
1416                         break;
1417                 case 13: /* unblank the screen */
1418                         poke_blanked_console();
1419                         break;
1420                 case 14: /* set vesa powerdown interval */
1421                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1422                         break;
1423                 case 15: /* activate the previous console */
1424                         set_console(last_console);
1425                         break;
1426         }
1427 }
1428
1429 /* console_sem is held */
1430 static void csi_at(struct vc_data *vc, unsigned int nr)
1431 {
1432         if (nr > vc->vc_cols - vc->vc_x)
1433                 nr = vc->vc_cols - vc->vc_x;
1434         else if (!nr)
1435                 nr = 1;
1436         insert_char(vc, nr);
1437 }
1438
1439 /* console_sem is held */
1440 static void csi_L(struct vc_data *vc, unsigned int nr)
1441 {
1442         if (nr > vc->vc_rows - vc->vc_y)
1443                 nr = vc->vc_rows - vc->vc_y;
1444         else if (!nr)
1445                 nr = 1;
1446         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1447         vc->vc_need_wrap = 0;
1448 }
1449
1450 /* console_sem is held */
1451 static void csi_P(struct vc_data *vc, unsigned int nr)
1452 {
1453         if (nr > vc->vc_cols - vc->vc_x)
1454                 nr = vc->vc_cols - vc->vc_x;
1455         else if (!nr)
1456                 nr = 1;
1457         delete_char(vc, nr);
1458 }
1459
1460 /* console_sem is held */
1461 static void csi_M(struct vc_data *vc, unsigned int nr)
1462 {
1463         if (nr > vc->vc_rows - vc->vc_y)
1464                 nr = vc->vc_rows - vc->vc_y;
1465         else if (!nr)
1466                 nr=1;
1467         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1468         vc->vc_need_wrap = 0;
1469 }
1470
1471 /* console_sem is held (except via vc_init->reset_terminal */
1472 static void save_cur(struct vc_data *vc)
1473 {
1474         vc->vc_saved_x          = vc->vc_x;
1475         vc->vc_saved_y          = vc->vc_y;
1476         vc->vc_s_intensity      = vc->vc_intensity;
1477         vc->vc_s_italic         = vc->vc_italic;
1478         vc->vc_s_underline      = vc->vc_underline;
1479         vc->vc_s_blink          = vc->vc_blink;
1480         vc->vc_s_reverse        = vc->vc_reverse;
1481         vc->vc_s_charset        = vc->vc_charset;
1482         vc->vc_s_color          = vc->vc_color;
1483         vc->vc_saved_G0         = vc->vc_G0_charset;
1484         vc->vc_saved_G1         = vc->vc_G1_charset;
1485 }
1486
1487 /* console_sem is held */
1488 static void restore_cur(struct vc_data *vc)
1489 {
1490         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1491         vc->vc_intensity        = vc->vc_s_intensity;
1492         vc->vc_italic           = vc->vc_s_italic;
1493         vc->vc_underline        = vc->vc_s_underline;
1494         vc->vc_blink            = vc->vc_s_blink;
1495         vc->vc_reverse          = vc->vc_s_reverse;
1496         vc->vc_charset          = vc->vc_s_charset;
1497         vc->vc_color            = vc->vc_s_color;
1498         vc->vc_G0_charset       = vc->vc_saved_G0;
1499         vc->vc_G1_charset       = vc->vc_saved_G1;
1500         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1501         update_attr(vc);
1502         vc->vc_need_wrap = 0;
1503 }
1504
1505 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1506         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1507         ESpalette };
1508
1509 /* console_sem is held (except via vc_init()) */
1510 static void reset_terminal(struct vc_data *vc, int do_clear)
1511 {
1512         vc->vc_top              = 0;
1513         vc->vc_bottom           = vc->vc_rows;
1514         vc->vc_state            = ESnormal;
1515         vc->vc_ques             = 0;
1516         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1517         vc->vc_G0_charset       = LAT1_MAP;
1518         vc->vc_G1_charset       = GRAF_MAP;
1519         vc->vc_charset          = 0;
1520         vc->vc_need_wrap        = 0;
1521         vc->vc_report_mouse     = 0;
1522         vc->vc_utf              = default_utf8;
1523         vc->vc_utf_count        = 0;
1524
1525         vc->vc_disp_ctrl        = 0;
1526         vc->vc_toggle_meta      = 0;
1527
1528         vc->vc_decscnm          = 0;
1529         vc->vc_decom            = 0;
1530         vc->vc_decawm           = 1;
1531         vc->vc_deccm            = 1;
1532         vc->vc_decim            = 0;
1533
1534         set_kbd(vc, decarm);
1535         clr_kbd(vc, decckm);
1536         clr_kbd(vc, kbdapplic);
1537         clr_kbd(vc, lnm);
1538         kbd_table[vc->vc_num].lockstate = 0;
1539         kbd_table[vc->vc_num].slockstate = 0;
1540         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1541         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1542         /* do not do set_leds here because this causes an endless tasklet loop
1543            when the keyboard hasn't been initialized yet */
1544
1545         vc->vc_cursor_type = CUR_DEFAULT;
1546         vc->vc_complement_mask = vc->vc_s_complement_mask;
1547
1548         default_attr(vc);
1549         update_attr(vc);
1550
1551         vc->vc_tab_stop[0]      = 0x01010100;
1552         vc->vc_tab_stop[1]      =
1553         vc->vc_tab_stop[2]      =
1554         vc->vc_tab_stop[3]      =
1555         vc->vc_tab_stop[4]      = 0x01010101;
1556
1557         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1558         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1559
1560         gotoxy(vc, 0, 0);
1561         save_cur(vc);
1562         if (do_clear)
1563             csi_J(vc, 2);
1564 }
1565
1566 /* console_sem is held */
1567 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1568 {
1569         /*
1570          *  Control characters can be used in the _middle_
1571          *  of an escape sequence.
1572          */
1573         switch (c) {
1574         case 0:
1575                 return;
1576         case 7:
1577                 if (vc->vc_bell_duration)
1578                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1579                 return;
1580         case 8:
1581                 bs(vc);
1582                 return;
1583         case 9:
1584                 vc->vc_pos -= (vc->vc_x << 1);
1585                 while (vc->vc_x < vc->vc_cols - 1) {
1586                         vc->vc_x++;
1587                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1588                                 break;
1589                 }
1590                 vc->vc_pos += (vc->vc_x << 1);
1591                 return;
1592         case 10: case 11: case 12:
1593                 lf(vc);
1594                 if (!is_kbd(vc, lnm))
1595                         return;
1596         case 13:
1597                 cr(vc);
1598                 return;
1599         case 14:
1600                 vc->vc_charset = 1;
1601                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1602                 vc->vc_disp_ctrl = 1;
1603                 return;
1604         case 15:
1605                 vc->vc_charset = 0;
1606                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1607                 vc->vc_disp_ctrl = 0;
1608                 return;
1609         case 24: case 26:
1610                 vc->vc_state = ESnormal;
1611                 return;
1612         case 27:
1613                 vc->vc_state = ESesc;
1614                 return;
1615         case 127:
1616                 del(vc);
1617                 return;
1618         case 128+27:
1619                 vc->vc_state = ESsquare;
1620                 return;
1621         }
1622         switch(vc->vc_state) {
1623         case ESesc:
1624                 vc->vc_state = ESnormal;
1625                 switch (c) {
1626                 case '[':
1627                         vc->vc_state = ESsquare;
1628                         return;
1629                 case ']':
1630                         vc->vc_state = ESnonstd;
1631                         return;
1632                 case '%':
1633                         vc->vc_state = ESpercent;
1634                         return;
1635                 case 'E':
1636                         cr(vc);
1637                         lf(vc);
1638                         return;
1639                 case 'M':
1640                         ri(vc);
1641                         return;
1642                 case 'D':
1643                         lf(vc);
1644                         return;
1645                 case 'H':
1646                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1647                         return;
1648                 case 'Z':
1649                         respond_ID(tty);
1650                         return;
1651                 case '7':
1652                         save_cur(vc);
1653                         return;
1654                 case '8':
1655                         restore_cur(vc);
1656                         return;
1657                 case '(':
1658                         vc->vc_state = ESsetG0;
1659                         return;
1660                 case ')':
1661                         vc->vc_state = ESsetG1;
1662                         return;
1663                 case '#':
1664                         vc->vc_state = EShash;
1665                         return;
1666                 case 'c':
1667                         reset_terminal(vc, 1);
1668                         return;
1669                 case '>':  /* Numeric keypad */
1670                         clr_kbd(vc, kbdapplic);
1671                         return;
1672                 case '=':  /* Appl. keypad */
1673                         set_kbd(vc, kbdapplic);
1674                         return;
1675                 }
1676                 return;
1677         case ESnonstd:
1678                 if (c=='P') {   /* palette escape sequence */
1679                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1680                                 vc->vc_par[vc->vc_npar] = 0;
1681                         vc->vc_npar = 0;
1682                         vc->vc_state = ESpalette;
1683                         return;
1684                 } else if (c=='R') {   /* reset palette */
1685                         reset_palette(vc);
1686                         vc->vc_state = ESnormal;
1687                 } else
1688                         vc->vc_state = ESnormal;
1689                 return;
1690         case ESpalette:
1691                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1692                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1693                         if (vc->vc_npar == 7) {
1694                                 int i = vc->vc_par[0] * 3, j = 1;
1695                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1696                                 vc->vc_palette[i++] += vc->vc_par[j++];
1697                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1698                                 vc->vc_palette[i++] += vc->vc_par[j++];
1699                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1700                                 vc->vc_palette[i] += vc->vc_par[j];
1701                                 set_palette(vc);
1702                                 vc->vc_state = ESnormal;
1703                         }
1704                 } else
1705                         vc->vc_state = ESnormal;
1706                 return;
1707         case ESsquare:
1708                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1709                         vc->vc_par[vc->vc_npar] = 0;
1710                 vc->vc_npar = 0;
1711                 vc->vc_state = ESgetpars;
1712                 if (c == '[') { /* Function key */
1713                         vc->vc_state=ESfunckey;
1714                         return;
1715                 }
1716                 vc->vc_ques = (c == '?');
1717                 if (vc->vc_ques)
1718                         return;
1719         case ESgetpars:
1720                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1721                         vc->vc_npar++;
1722                         return;
1723                 } else if (c>='0' && c<='9') {
1724                         vc->vc_par[vc->vc_npar] *= 10;
1725                         vc->vc_par[vc->vc_npar] += c - '0';
1726                         return;
1727                 } else
1728                         vc->vc_state = ESgotpars;
1729         case ESgotpars:
1730                 vc->vc_state = ESnormal;
1731                 switch(c) {
1732                 case 'h':
1733                         set_mode(vc, 1);
1734                         return;
1735                 case 'l':
1736                         set_mode(vc, 0);
1737                         return;
1738                 case 'c':
1739                         if (vc->vc_ques) {
1740                                 if (vc->vc_par[0])
1741                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1742                                 else
1743                                         vc->vc_cursor_type = CUR_DEFAULT;
1744                                 return;
1745                         }
1746                         break;
1747                 case 'm':
1748                         if (vc->vc_ques) {
1749                                 clear_selection();
1750                                 if (vc->vc_par[0])
1751                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1752                                 else
1753                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1754                                 return;
1755                         }
1756                         break;
1757                 case 'n':
1758                         if (!vc->vc_ques) {
1759                                 if (vc->vc_par[0] == 5)
1760                                         status_report(tty);
1761                                 else if (vc->vc_par[0] == 6)
1762                                         cursor_report(vc, tty);
1763                         }
1764                         return;
1765                 }
1766                 if (vc->vc_ques) {
1767                         vc->vc_ques = 0;
1768                         return;
1769                 }
1770                 switch(c) {
1771                 case 'G': case '`':
1772                         if (vc->vc_par[0])
1773                                 vc->vc_par[0]--;
1774                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1775                         return;
1776                 case 'A':
1777                         if (!vc->vc_par[0])
1778                                 vc->vc_par[0]++;
1779                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1780                         return;
1781                 case 'B': case 'e':
1782                         if (!vc->vc_par[0])
1783                                 vc->vc_par[0]++;
1784                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1785                         return;
1786                 case 'C': case 'a':
1787                         if (!vc->vc_par[0])
1788                                 vc->vc_par[0]++;
1789                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1790                         return;
1791                 case 'D':
1792                         if (!vc->vc_par[0])
1793                                 vc->vc_par[0]++;
1794                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1795                         return;
1796                 case 'E':
1797                         if (!vc->vc_par[0])
1798                                 vc->vc_par[0]++;
1799                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1800                         return;
1801                 case 'F':
1802                         if (!vc->vc_par[0])
1803                                 vc->vc_par[0]++;
1804                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1805                         return;
1806                 case 'd':
1807                         if (vc->vc_par[0])
1808                                 vc->vc_par[0]--;
1809                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1810                         return;
1811                 case 'H': case 'f':
1812                         if (vc->vc_par[0])
1813                                 vc->vc_par[0]--;
1814                         if (vc->vc_par[1])
1815                                 vc->vc_par[1]--;
1816                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1817                         return;
1818                 case 'J':
1819                         csi_J(vc, vc->vc_par[0]);
1820                         return;
1821                 case 'K':
1822                         csi_K(vc, vc->vc_par[0]);
1823                         return;
1824                 case 'L':
1825                         csi_L(vc, vc->vc_par[0]);
1826                         return;
1827                 case 'M':
1828                         csi_M(vc, vc->vc_par[0]);
1829                         return;
1830                 case 'P':
1831                         csi_P(vc, vc->vc_par[0]);
1832                         return;
1833                 case 'c':
1834                         if (!vc->vc_par[0])
1835                                 respond_ID(tty);
1836                         return;
1837                 case 'g':
1838                         if (!vc->vc_par[0])
1839                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1840                         else if (vc->vc_par[0] == 3) {
1841                                 vc->vc_tab_stop[0] =
1842                                         vc->vc_tab_stop[1] =
1843                                         vc->vc_tab_stop[2] =
1844                                         vc->vc_tab_stop[3] =
1845                                         vc->vc_tab_stop[4] = 0;
1846                         }
1847                         return;
1848                 case 'm':
1849                         csi_m(vc);
1850                         return;
1851                 case 'q': /* DECLL - but only 3 leds */
1852                         /* map 0,1,2,3 to 0,1,2,4 */
1853                         if (vc->vc_par[0] < 4)
1854                                 setledstate(kbd_table + vc->vc_num,
1855                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1856                         return;
1857                 case 'r':
1858                         if (!vc->vc_par[0])
1859                                 vc->vc_par[0]++;
1860                         if (!vc->vc_par[1])
1861                                 vc->vc_par[1] = vc->vc_rows;
1862                         /* Minimum allowed region is 2 lines */
1863                         if (vc->vc_par[0] < vc->vc_par[1] &&
1864                             vc->vc_par[1] <= vc->vc_rows) {
1865                                 vc->vc_top = vc->vc_par[0] - 1;
1866                                 vc->vc_bottom = vc->vc_par[1];
1867                                 gotoxay(vc, 0, 0);
1868                         }
1869                         return;
1870                 case 's':
1871                         save_cur(vc);
1872                         return;
1873                 case 'u':
1874                         restore_cur(vc);
1875                         return;
1876                 case 'X':
1877                         csi_X(vc, vc->vc_par[0]);
1878                         return;
1879                 case '@':
1880                         csi_at(vc, vc->vc_par[0]);
1881                         return;
1882                 case ']': /* setterm functions */
1883                         setterm_command(vc);
1884                         return;
1885                 }
1886                 return;
1887         case ESpercent:
1888                 vc->vc_state = ESnormal;
1889                 switch (c) {
1890                 case '@':  /* defined in ISO 2022 */
1891                         vc->vc_utf = 0;
1892                         return;
1893                 case 'G':  /* prelim official escape code */
1894                 case '8':  /* retained for compatibility */
1895                         vc->vc_utf = 1;
1896                         return;
1897                 }
1898                 return;
1899         case ESfunckey:
1900                 vc->vc_state = ESnormal;
1901                 return;
1902         case EShash:
1903                 vc->vc_state = ESnormal;
1904                 if (c == '8') {
1905                         /* DEC screen alignment test. kludge :-) */
1906                         vc->vc_video_erase_char =
1907                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1908                         csi_J(vc, 2);
1909                         vc->vc_video_erase_char =
1910                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1911                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1912                 }
1913                 return;
1914         case ESsetG0:
1915                 if (c == '0')
1916                         vc->vc_G0_charset = GRAF_MAP;
1917                 else if (c == 'B')
1918                         vc->vc_G0_charset = LAT1_MAP;
1919                 else if (c == 'U')
1920                         vc->vc_G0_charset = IBMPC_MAP;
1921                 else if (c == 'K')
1922                         vc->vc_G0_charset = USER_MAP;
1923                 if (vc->vc_charset == 0)
1924                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1925                 vc->vc_state = ESnormal;
1926                 return;
1927         case ESsetG1:
1928                 if (c == '0')
1929                         vc->vc_G1_charset = GRAF_MAP;
1930                 else if (c == 'B')
1931                         vc->vc_G1_charset = LAT1_MAP;
1932                 else if (c == 'U')
1933                         vc->vc_G1_charset = IBMPC_MAP;
1934                 else if (c == 'K')
1935                         vc->vc_G1_charset = USER_MAP;
1936                 if (vc->vc_charset == 1)
1937                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1938                 vc->vc_state = ESnormal;
1939                 return;
1940         default:
1941                 vc->vc_state = ESnormal;
1942         }
1943 }
1944
1945 /* This is a temporary buffer used to prepare a tty console write
1946  * so that we can easily avoid touching user space while holding the
1947  * console spinlock.  It is allocated in con_init and is shared by
1948  * this code and the vc_screen read/write tty calls.
1949  *
1950  * We have to allocate this statically in the kernel data section
1951  * since console_init (and thus con_init) are called before any
1952  * kernel memory allocation is available.
1953  */
1954 char con_buf[CON_BUF_SIZE];
1955 DEFINE_MUTEX(con_buf_mtx);
1956
1957 /* is_double_width() is based on the wcwidth() implementation by
1958  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
1959  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
1960  */
1961 struct interval {
1962         uint32_t first;
1963         uint32_t last;
1964 };
1965
1966 static int bisearch(uint32_t ucs, const struct interval *table, int max)
1967 {
1968         int min = 0;
1969         int mid;
1970
1971         if (ucs < table[0].first || ucs > table[max].last)
1972                 return 0;
1973         while (max >= min) {
1974                 mid = (min + max) / 2;
1975                 if (ucs > table[mid].last)
1976                         min = mid + 1;
1977                 else if (ucs < table[mid].first)
1978                         max = mid - 1;
1979                 else
1980                         return 1;
1981         }
1982         return 0;
1983 }
1984
1985 static int is_double_width(uint32_t ucs)
1986 {
1987         static const struct interval double_width[] = {
1988                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
1989                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1990                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
1991                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
1992         };
1993         return bisearch(ucs, double_width,
1994                 sizeof(double_width) / sizeof(*double_width) - 1);
1995 }
1996
1997 /* acquires console_sem */
1998 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1999 {
2000 #ifdef VT_BUF_VRAM_ONLY
2001 #define FLUSH do { } while(0);
2002 #else
2003 #define FLUSH if (draw_x >= 0) { \
2004         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2005         draw_x = -1; \
2006         }
2007 #endif
2008
2009         int c, tc, ok, n = 0, draw_x = -1;
2010         unsigned int currcons;
2011         unsigned long draw_from = 0, draw_to = 0;
2012         struct vc_data *vc;
2013         unsigned char vc_attr;
2014         uint8_t rescan;
2015         uint8_t inverse;
2016         uint8_t width;
2017         u16 himask, charmask;
2018         const unsigned char *orig_buf = NULL;
2019         int orig_count;
2020
2021         if (in_interrupt())
2022                 return count;
2023
2024         might_sleep();
2025
2026         acquire_console_sem();
2027         vc = tty->driver_data;
2028         if (vc == NULL) {
2029                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2030                 release_console_sem();
2031                 return 0;
2032         }
2033
2034         currcons = vc->vc_num;
2035         if (!vc_cons_allocated(currcons)) {
2036             /* could this happen? */
2037             static int error = 0;
2038             if (!error) {
2039                 error = 1;
2040                 printk("con_write: tty %d not allocated\n", currcons+1);
2041             }
2042             release_console_sem();
2043             return 0;
2044         }
2045         release_console_sem();
2046
2047         orig_buf = buf;
2048         orig_count = count;
2049
2050         /* At this point 'buf' is guaranteed to be a kernel buffer
2051          * and therefore no access to userspace (and therefore sleeping)
2052          * will be needed.  The con_buf_mtx serializes all tty based
2053          * console rendering and vcs write/read operations.  We hold
2054          * the console spinlock during the entire write.
2055          */
2056
2057         acquire_console_sem();
2058
2059         vc = tty->driver_data;
2060         if (vc == NULL) {
2061                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2062                 release_console_sem();
2063                 goto out;
2064         }
2065
2066         himask = vc->vc_hi_font_mask;
2067         charmask = himask ? 0x1ff : 0xff;
2068
2069         /* undraw cursor first */
2070         if (IS_FG(vc))
2071                 hide_cursor(vc);
2072
2073         while (!tty->stopped && count) {
2074                 int orig = *buf;
2075                 c = orig;
2076                 buf++;
2077                 n++;
2078                 count--;
2079                 rescan = 0;
2080                 inverse = 0;
2081                 width = 1;
2082
2083                 /* Do no translation at all in control states */
2084                 if (vc->vc_state != ESnormal) {
2085                         tc = c;
2086                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2087                     /* Combine UTF-8 into Unicode in vc_utf_char.
2088                      * vc_utf_count is the number of continuation bytes still
2089                      * expected to arrive.
2090                      * vc_npar is the number of continuation bytes arrived so
2091                      * far
2092                      */
2093 rescan_last_byte:
2094                     if ((c & 0xc0) == 0x80) {
2095                         /* Continuation byte received */
2096                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2097                         if (vc->vc_utf_count) {
2098                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2099                             vc->vc_npar++;
2100                             if (--vc->vc_utf_count) {
2101                                 /* Still need some bytes */
2102                                 continue;
2103                             }
2104                             /* Got a whole character */
2105                             c = vc->vc_utf_char;
2106                             /* Reject overlong sequences */
2107                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2108                                         c > utf8_length_changes[vc->vc_npar])
2109                                 c = 0xfffd;
2110                         } else {
2111                             /* Unexpected continuation byte */
2112                             vc->vc_utf_count = 0;
2113                             c = 0xfffd;
2114                         }
2115                     } else {
2116                         /* Single ASCII byte or first byte of a sequence received */
2117                         if (vc->vc_utf_count) {
2118                             /* Continuation byte expected */
2119                             rescan = 1;
2120                             vc->vc_utf_count = 0;
2121                             c = 0xfffd;
2122                         } else if (c > 0x7f) {
2123                             /* First byte of a multibyte sequence received */
2124                             vc->vc_npar = 0;
2125                             if ((c & 0xe0) == 0xc0) {
2126                                 vc->vc_utf_count = 1;
2127                                 vc->vc_utf_char = (c & 0x1f);
2128                             } else if ((c & 0xf0) == 0xe0) {
2129                                 vc->vc_utf_count = 2;
2130                                 vc->vc_utf_char = (c & 0x0f);
2131                             } else if ((c & 0xf8) == 0xf0) {
2132                                 vc->vc_utf_count = 3;
2133                                 vc->vc_utf_char = (c & 0x07);
2134                             } else if ((c & 0xfc) == 0xf8) {
2135                                 vc->vc_utf_count = 4;
2136                                 vc->vc_utf_char = (c & 0x03);
2137                             } else if ((c & 0xfe) == 0xfc) {
2138                                 vc->vc_utf_count = 5;
2139                                 vc->vc_utf_char = (c & 0x01);
2140                             } else {
2141                                 /* 254 and 255 are invalid */
2142                                 c = 0xfffd;
2143                             }
2144                             if (vc->vc_utf_count) {
2145                                 /* Still need some bytes */
2146                                 continue;
2147                             }
2148                         }
2149                         /* Nothing to do if an ASCII byte was received */
2150                     }
2151                     /* End of UTF-8 decoding. */
2152                     /* c is the received character, or U+FFFD for invalid sequences. */
2153                     /* Replace invalid Unicode code points with U+FFFD too */
2154                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2155                         c = 0xfffd;
2156                     tc = c;
2157                 } else {        /* no utf or alternate charset mode */
2158                     tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2159                 }
2160
2161                 /* If the original code was a control character we
2162                  * only allow a glyph to be displayed if the code is
2163                  * not normally used (such as for cursor movement) or
2164                  * if the disp_ctrl mode has been explicitly enabled.
2165                  * Certain characters (as given by the CTRL_ALWAYS
2166                  * bitmap) are always displayed as control characters,
2167                  * as the console would be pretty useless without
2168                  * them; to display an arbitrary font position use the
2169                  * direct-to-font zone in UTF-8 mode.
2170                  */
2171                 ok = tc && (c >= 32 ||
2172                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2173                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2174                         && (c != 127 || vc->vc_disp_ctrl)
2175                         && (c != 128+27);
2176
2177                 if (vc->vc_state == ESnormal && ok) {
2178                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2179                                 if (is_double_width(c))
2180                                         width = 2;
2181                         }
2182                         /* Now try to find out how to display it */
2183                         tc = conv_uni_to_pc(vc, tc);
2184                         if (tc & ~charmask) {
2185                                 if (tc == -1 || tc == -2) {
2186                                     continue; /* nothing to display */
2187                                 }
2188                                 /* Glyph not found */
2189                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2190                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2191                                        This would make absolutely no sense with Unicode in mind,
2192                                        but do this for ASCII characters since a font may lack
2193                                        Unicode mapping info and we don't want to end up with
2194                                        having question marks only. */
2195                                     tc = c;
2196                                 } else {
2197                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2198                                     tc = conv_uni_to_pc(vc, 0xfffd);
2199                                     if (tc < 0) {
2200                                         inverse = 1;
2201                                         tc = conv_uni_to_pc(vc, '?');
2202                                         if (tc < 0) tc = '?';
2203                                     }
2204                                 }
2205                         }
2206
2207                         if (!inverse) {
2208                                 vc_attr = vc->vc_attr;
2209                         } else {
2210                                 /* invert vc_attr */
2211                                 if (!vc->vc_can_do_color) {
2212                                         vc_attr = (vc->vc_attr) ^ 0x08;
2213                                 } else if (vc->vc_hi_font_mask == 0x100) {
2214                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2215                                 } else {
2216                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2217                                 }
2218                                 FLUSH
2219                         }
2220
2221                         while (1) {
2222                                 if (vc->vc_need_wrap || vc->vc_decim)
2223                                         FLUSH
2224                                 if (vc->vc_need_wrap) {
2225                                         cr(vc);
2226                                         lf(vc);
2227                                 }
2228                                 if (vc->vc_decim)
2229                                         insert_char(vc, 1);
2230                                 scr_writew(himask ?
2231                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2232                                              (vc_attr << 8) + tc,
2233                                            (u16 *) vc->vc_pos);
2234                                 if (DO_UPDATE(vc) && draw_x < 0) {
2235                                         draw_x = vc->vc_x;
2236                                         draw_from = vc->vc_pos;
2237                                 }
2238                                 if (vc->vc_x == vc->vc_cols - 1) {
2239                                         vc->vc_need_wrap = vc->vc_decawm;
2240                                         draw_to = vc->vc_pos + 2;
2241                                 } else {
2242                                         vc->vc_x++;
2243                                         draw_to = (vc->vc_pos += 2);
2244                                 }
2245
2246                                 if (!--width) break;
2247
2248                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2249                                 if (tc < 0) tc = ' ';
2250                         }
2251
2252                         if (inverse) {
2253                                 FLUSH
2254                         }
2255
2256                         if (rescan) {
2257                                 rescan = 0;
2258                                 inverse = 0;
2259                                 width = 1;
2260                                 c = orig;
2261                                 goto rescan_last_byte;
2262                         }
2263                         continue;
2264                 }
2265                 FLUSH
2266                 do_con_trol(tty, vc, orig);
2267         }
2268         FLUSH
2269         console_conditional_schedule();
2270         release_console_sem();
2271
2272 out:
2273         return n;
2274 #undef FLUSH
2275 }
2276
2277 /*
2278  * This is the console switching callback.
2279  *
2280  * Doing console switching in a process context allows
2281  * us to do the switches asynchronously (needed when we want
2282  * to switch due to a keyboard interrupt).  Synchronization
2283  * with other console code and prevention of re-entrancy is
2284  * ensured with console_sem.
2285  */
2286 static void console_callback(struct work_struct *ignored)
2287 {
2288         acquire_console_sem();
2289
2290         if (want_console >= 0) {
2291                 if (want_console != fg_console &&
2292                     vc_cons_allocated(want_console)) {
2293                         hide_cursor(vc_cons[fg_console].d);
2294                         change_console(vc_cons[want_console].d);
2295                         /* we only changed when the console had already
2296                            been allocated - a new console is not created
2297                            in an interrupt routine */
2298                 }
2299                 want_console = -1;
2300         }
2301         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2302                 do_poke_blanked_console = 0;
2303                 poke_blanked_console();
2304         }
2305         if (scrollback_delta) {
2306                 struct vc_data *vc = vc_cons[fg_console].d;
2307                 clear_selection();
2308                 if (vc->vc_mode == KD_TEXT)
2309                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2310                 scrollback_delta = 0;
2311         }
2312         if (blank_timer_expired) {
2313                 do_blank_screen(0);
2314                 blank_timer_expired = 0;
2315         }
2316
2317         release_console_sem();
2318 }
2319
2320 int set_console(int nr)
2321 {
2322         struct vc_data *vc = vc_cons[fg_console].d;
2323
2324         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2325                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2326
2327                 /*
2328                  * Console switch will fail in console_callback() or
2329                  * change_console() so there is no point scheduling
2330                  * the callback
2331                  *
2332                  * Existing set_console() users don't check the return
2333                  * value so this shouldn't break anything
2334                  */
2335                 return -EINVAL;
2336         }
2337
2338         want_console = nr;
2339         schedule_console_callback();
2340
2341         return 0;
2342 }
2343
2344 struct tty_driver *console_driver;
2345
2346 #ifdef CONFIG_VT_CONSOLE
2347
2348 /*
2349  *      Console on virtual terminal
2350  *
2351  * The console must be locked when we get here.
2352  */
2353
2354 static void vt_console_print(struct console *co, const char *b, unsigned count)
2355 {
2356         struct vc_data *vc = vc_cons[fg_console].d;
2357         unsigned char c;
2358         static unsigned long printing;
2359         const ushort *start;
2360         ushort cnt = 0;
2361         ushort myx;
2362
2363         /* console busy or not yet initialized */
2364         if (!printable || test_and_set_bit(0, &printing))
2365                 return;
2366
2367         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2368                 vc = vc_cons[kmsg_redirect - 1].d;
2369
2370         /* read `x' only after setting currcons properly (otherwise
2371            the `x' macro will read the x of the foreground console). */
2372         myx = vc->vc_x;
2373
2374         if (!vc_cons_allocated(fg_console)) {
2375                 /* impossible */
2376                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2377                 goto quit;
2378         }
2379
2380         if (vc->vc_mode != KD_TEXT)
2381                 goto quit;
2382
2383         /* undraw cursor first */
2384         if (IS_FG(vc))
2385                 hide_cursor(vc);
2386
2387         start = (ushort *)vc->vc_pos;
2388
2389         /* Contrived structure to try to emulate original need_wrap behaviour
2390          * Problems caused when we have need_wrap set on '\n' character */
2391         while (count--) {
2392                 c = *b++;
2393                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2394                         if (cnt > 0) {
2395                                 if (CON_IS_VISIBLE(vc))
2396                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2397                                 vc->vc_x += cnt;
2398                                 if (vc->vc_need_wrap)
2399                                         vc->vc_x--;
2400                                 cnt = 0;
2401                         }
2402                         if (c == 8) {           /* backspace */
2403                                 bs(vc);
2404                                 start = (ushort *)vc->vc_pos;
2405                                 myx = vc->vc_x;
2406                                 continue;
2407                         }
2408                         if (c != 13)
2409                                 lf(vc);
2410                         cr(vc);
2411                         start = (ushort *)vc->vc_pos;
2412                         myx = vc->vc_x;
2413                         if (c == 10 || c == 13)
2414                                 continue;
2415                 }
2416                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2417                 cnt++;
2418                 if (myx == vc->vc_cols - 1) {
2419                         vc->vc_need_wrap = 1;
2420                         continue;
2421                 }
2422                 vc->vc_pos += 2;
2423                 myx++;
2424         }
2425         if (cnt > 0) {
2426                 if (CON_IS_VISIBLE(vc))
2427                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2428                 vc->vc_x += cnt;
2429                 if (vc->vc_x == vc->vc_cols) {
2430                         vc->vc_x--;
2431                         vc->vc_need_wrap = 1;
2432                 }
2433         }
2434         set_cursor(vc);
2435
2436 quit:
2437         clear_bit(0, &printing);
2438 }
2439
2440 static struct tty_driver *vt_console_device(struct console *c, int *index)
2441 {
2442         *index = c->index ? c->index-1 : fg_console;
2443         return console_driver;
2444 }
2445
2446 static struct console vt_console_driver = {
2447         .name           = "tty",
2448         .write          = vt_console_print,
2449         .device         = vt_console_device,
2450         .unblank        = unblank_screen,
2451         .flags          = CON_PRINTBUFFER,
2452         .index          = -1,
2453 };
2454 #endif
2455
2456 /*
2457  *      Handling of Linux-specific VC ioctls
2458  */
2459
2460 /*
2461  * Generally a bit racy with respect to console_sem().
2462  *
2463  * There are some functions which don't need it.
2464  *
2465  * There are some functions which can sleep for arbitrary periods
2466  * (paste_selection) but we don't need the lock there anyway.
2467  *
2468  * set_selection has locking, and definitely needs it
2469  */
2470
2471 int tioclinux(struct tty_struct *tty, unsigned long arg)
2472 {
2473         char type, data;
2474         char __user *p = (char __user *)arg;
2475         int lines;
2476         int ret;
2477
2478         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2479                 return -EINVAL;
2480         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2481                 return -EPERM;
2482         if (get_user(type, p))
2483                 return -EFAULT;
2484         ret = 0;
2485         switch (type)
2486         {
2487                 case TIOCL_SETSEL:
2488                         acquire_console_sem();
2489                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2490                         release_console_sem();
2491                         break;
2492                 case TIOCL_PASTESEL:
2493                         ret = paste_selection(tty);
2494                         break;
2495                 case TIOCL_UNBLANKSCREEN:
2496                         acquire_console_sem();
2497                         unblank_screen();
2498                         release_console_sem();
2499                         break;
2500                 case TIOCL_SELLOADLUT:
2501                         ret = sel_loadlut(p);
2502                         break;
2503                 case TIOCL_GETSHIFTSTATE:
2504                         
2505         /*
2506          * Make it possible to react to Shift+Mousebutton.
2507          * Note that 'shift_state' is an undocumented
2508          * kernel-internal variable; programs not closely
2509          * related to the kernel should not use this.
2510          */
2511                         data = shift_state;
2512                         ret = __put_user(data, p);
2513                         break;
2514                 case TIOCL_GETMOUSEREPORTING:
2515                         data = mouse_reporting();
2516                         ret = __put_user(data, p);
2517                         break;
2518                 case TIOCL_SETVESABLANK:
2519                         ret = set_vesa_blanking(p);
2520                         break;
2521                 case TIOCL_GETKMSGREDIRECT:
2522                         data = kmsg_redirect;
2523                         ret = __put_user(data, p);
2524                         break;
2525                 case TIOCL_SETKMSGREDIRECT:
2526                         if (!capable(CAP_SYS_ADMIN)) {
2527                                 ret = -EPERM;
2528                         } else {
2529                                 if (get_user(data, p+1))
2530                                         ret = -EFAULT;
2531                                 else
2532                                         kmsg_redirect = data;
2533                         }
2534                         break;
2535                 case TIOCL_GETFGCONSOLE:
2536                         ret = fg_console;
2537                         break;
2538                 case TIOCL_SCROLLCONSOLE:
2539                         if (get_user(lines, (s32 __user *)(p+4))) {
2540                                 ret = -EFAULT;
2541                         } else {
2542                                 scrollfront(vc_cons[fg_console].d, lines);
2543                                 ret = 0;
2544                         }
2545                         break;
2546                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2547                         acquire_console_sem();
2548                         ignore_poke = 1;
2549                         do_blank_screen(0);
2550                         release_console_sem();
2551                         break;
2552                 case TIOCL_BLANKEDSCREEN:
2553                         ret = console_blanked;
2554                         break;
2555                 default:
2556                         ret = -EINVAL;
2557                         break;
2558         }
2559         return ret;
2560 }
2561
2562 /*
2563  * /dev/ttyN handling
2564  */
2565
2566 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2567 {
2568         int     retval;
2569
2570         retval = do_con_write(tty, buf, count);
2571         con_flush_chars(tty);
2572
2573         return retval;
2574 }
2575
2576 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2577 {
2578         if (in_interrupt())
2579                 return; /* n_r3964 calls put_char() from interrupt context */
2580         do_con_write(tty, &ch, 1);
2581 }
2582
2583 static int con_write_room(struct tty_struct *tty)
2584 {
2585         if (tty->stopped)
2586                 return 0;
2587         return 4096;            /* No limit, really; we're not buffering */
2588 }
2589
2590 static int con_chars_in_buffer(struct tty_struct *tty)
2591 {
2592         return 0;               /* we're not buffering */
2593 }
2594
2595 /*
2596  * con_throttle and con_unthrottle are only used for
2597  * paste_selection(), which has to stuff in a large number of
2598  * characters...
2599  */
2600 static void con_throttle(struct tty_struct *tty)
2601 {
2602 }
2603
2604 static void con_unthrottle(struct tty_struct *tty)
2605 {
2606         struct vc_data *vc = tty->driver_data;
2607
2608         wake_up_interruptible(&vc->paste_wait);
2609 }
2610
2611 /*
2612  * Turn the Scroll-Lock LED on when the tty is stopped
2613  */
2614 static void con_stop(struct tty_struct *tty)
2615 {
2616         int console_num;
2617         if (!tty)
2618                 return;
2619         console_num = tty->index;
2620         if (!vc_cons_allocated(console_num))
2621                 return;
2622         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2623         set_leds();
2624 }
2625
2626 /*
2627  * Turn the Scroll-Lock LED off when the console is started
2628  */
2629 static void con_start(struct tty_struct *tty)
2630 {
2631         int console_num;
2632         if (!tty)
2633                 return;
2634         console_num = tty->index;
2635         if (!vc_cons_allocated(console_num))
2636                 return;
2637         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2638         set_leds();
2639 }
2640
2641 static void con_flush_chars(struct tty_struct *tty)
2642 {
2643         struct vc_data *vc;
2644
2645         if (in_interrupt())     /* from flush_to_ldisc */
2646                 return;
2647
2648         /* if we race with con_close(), vt may be null */
2649         acquire_console_sem();
2650         vc = tty->driver_data;
2651         if (vc)
2652                 set_cursor(vc);
2653         release_console_sem();
2654 }
2655
2656 /*
2657  * Allocate the console screen memory.
2658  */
2659 static int con_open(struct tty_struct *tty, struct file *filp)
2660 {
2661         unsigned int currcons = tty->index;
2662         int ret = 0;
2663
2664         acquire_console_sem();
2665         if (tty->driver_data == NULL) {
2666                 ret = vc_allocate(currcons);
2667                 if (ret == 0) {
2668                         struct vc_data *vc = vc_cons[currcons].d;
2669                         tty->driver_data = vc;
2670                         vc->vc_tty = tty;
2671
2672                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2673                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2674                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2675                         }
2676                         release_console_sem();
2677                         vcs_make_sysfs(tty);
2678                         return ret;
2679                 }
2680         }
2681         release_console_sem();
2682         return ret;
2683 }
2684
2685 /*
2686  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2687  * and taking a ref against the tty while we're in the process of forgetting
2688  * about it and cleaning things up.
2689  *
2690  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2691  */
2692 static void con_close(struct tty_struct *tty, struct file *filp)
2693 {
2694         mutex_lock(&tty_mutex);
2695         acquire_console_sem();
2696         if (tty && tty->count == 1) {
2697                 struct vc_data *vc = tty->driver_data;
2698
2699                 if (vc)
2700                         vc->vc_tty = NULL;
2701                 tty->driver_data = NULL;
2702                 release_console_sem();
2703                 vcs_remove_sysfs(tty);
2704                 mutex_unlock(&tty_mutex);
2705                 /*
2706                  * tty_mutex is released, but we still hold BKL, so there is
2707                  * still exclusion against init_dev()
2708                  */
2709                 return;
2710         }
2711         release_console_sem();
2712         mutex_unlock(&tty_mutex);
2713 }
2714
2715 static int default_italic_color    = 2; // green (ASCII)
2716 static int default_underline_color = 3; // cyan (ASCII)
2717 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2718 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2719
2720 static void vc_init(struct vc_data *vc, unsigned int rows,
2721                     unsigned int cols, int do_clear)
2722 {
2723         int j, k ;
2724
2725         vc->vc_cols = cols;
2726         vc->vc_rows = rows;
2727         vc->vc_size_row = cols << 1;
2728         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2729
2730         set_origin(vc);
2731         vc->vc_pos = vc->vc_origin;
2732         reset_vc(vc);
2733         for (j=k=0; j<16; j++) {
2734                 vc->vc_palette[k++] = default_red[j] ;
2735                 vc->vc_palette[k++] = default_grn[j] ;
2736                 vc->vc_palette[k++] = default_blu[j] ;
2737         }
2738         vc->vc_def_color       = 0x07;   /* white */
2739         vc->vc_ulcolor         = default_underline_color;
2740         vc->vc_itcolor         = default_italic_color;
2741         vc->vc_halfcolor       = 0x08;   /* grey */
2742         init_waitqueue_head(&vc->paste_wait);
2743         reset_terminal(vc, do_clear);
2744 }
2745
2746 /*
2747  * This routine initializes console interrupts, and does nothing
2748  * else. If you want the screen to clear, call tty_write with
2749  * the appropriate escape-sequence.
2750  */
2751
2752 static int __init con_init(void)
2753 {
2754         const char *display_desc = NULL;
2755         struct vc_data *vc;
2756         unsigned int currcons = 0, i;
2757
2758         acquire_console_sem();
2759
2760         if (conswitchp)
2761                 display_desc = conswitchp->con_startup();
2762         if (!display_desc) {
2763                 fg_console = 0;
2764                 release_console_sem();
2765                 return 0;
2766         }
2767
2768         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2769                 struct con_driver *con_driver = &registered_con_driver[i];
2770
2771                 if (con_driver->con == NULL) {
2772                         con_driver->con = conswitchp;
2773                         con_driver->desc = display_desc;
2774                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2775                         con_driver->first = 0;
2776                         con_driver->last = MAX_NR_CONSOLES - 1;
2777                         break;
2778                 }
2779         }
2780
2781         for (i = 0; i < MAX_NR_CONSOLES; i++)
2782                 con_driver_map[i] = conswitchp;
2783
2784         if (blankinterval) {
2785                 blank_state = blank_normal_wait;
2786                 mod_timer(&console_timer, jiffies + blankinterval);
2787         }
2788
2789         /*
2790          * kmalloc is not running yet - we use the bootmem allocator.
2791          */
2792         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2793                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2794                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2795                 visual_init(vc, currcons, 1);
2796                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2797                 vc->vc_kmalloced = 0;
2798                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2799                         currcons || !vc->vc_sw->con_save_screen);
2800         }
2801         currcons = fg_console = 0;
2802         master_display_fg = vc = vc_cons[currcons].d;
2803         set_origin(vc);
2804         save_screen(vc);
2805         gotoxy(vc, vc->vc_x, vc->vc_y);
2806         csi_J(vc, 0);
2807         update_screen(vc);
2808         printk("Console: %s %s %dx%d",
2809                 vc->vc_can_do_color ? "colour" : "mono",
2810                 display_desc, vc->vc_cols, vc->vc_rows);
2811         printable = 1;
2812         printk("\n");
2813
2814         release_console_sem();
2815
2816 #ifdef CONFIG_VT_CONSOLE
2817         register_console(&vt_console_driver);
2818 #endif
2819         return 0;
2820 }
2821 console_initcall(con_init);
2822
2823 static const struct tty_operations con_ops = {
2824         .open = con_open,
2825         .close = con_close,
2826         .write = con_write,
2827         .write_room = con_write_room,
2828         .put_char = con_put_char,
2829         .flush_chars = con_flush_chars,
2830         .chars_in_buffer = con_chars_in_buffer,
2831         .ioctl = vt_ioctl,
2832         .stop = con_stop,
2833         .start = con_start,
2834         .throttle = con_throttle,
2835         .unthrottle = con_unthrottle,
2836 };
2837
2838 int __init vty_init(void)
2839 {
2840         vcs_init();
2841
2842         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2843         if (!console_driver)
2844                 panic("Couldn't allocate console driver\n");
2845         console_driver->owner = THIS_MODULE;
2846         console_driver->name = "tty";
2847         console_driver->name_base = 1;
2848         console_driver->major = TTY_MAJOR;
2849         console_driver->minor_start = 1;
2850         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2851         console_driver->init_termios = tty_std_termios;
2852         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2853         tty_set_operations(console_driver, &con_ops);
2854         if (tty_register_driver(console_driver))
2855                 panic("Couldn't register console driver\n");
2856
2857         kbd_init();
2858         console_map_init();
2859 #ifdef CONFIG_PROM_CONSOLE
2860         prom_con_init();
2861 #endif
2862 #ifdef CONFIG_MDA_CONSOLE
2863         mda_console_init();
2864 #endif
2865         return 0;
2866 }
2867
2868 #ifndef VT_SINGLE_DRIVER
2869 #include <linux/device.h>
2870
2871 static struct class *vtconsole_class;
2872
2873 static int bind_con_driver(const struct consw *csw, int first, int last,
2874                            int deflt)
2875 {
2876         struct module *owner = csw->owner;
2877         const char *desc = NULL;
2878         struct con_driver *con_driver;
2879         int i, j = -1, k = -1, retval = -ENODEV;
2880
2881         if (!try_module_get(owner))
2882                 return -ENODEV;
2883
2884         acquire_console_sem();
2885
2886         /* check if driver is registered */
2887         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2888                 con_driver = &registered_con_driver[i];
2889
2890                 if (con_driver->con == csw) {
2891                         desc = con_driver->desc;
2892                         retval = 0;
2893                         break;
2894                 }
2895         }
2896
2897         if (retval)
2898                 goto err;
2899
2900         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2901                 csw->con_startup();
2902                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2903         }
2904
2905         if (deflt) {
2906                 if (conswitchp)
2907                         module_put(conswitchp->owner);
2908
2909                 __module_get(owner);
2910                 conswitchp = csw;
2911         }
2912
2913         first = max(first, con_driver->first);
2914         last = min(last, con_driver->last);
2915
2916         for (i = first; i <= last; i++) {
2917                 int old_was_color;
2918                 struct vc_data *vc = vc_cons[i].d;
2919
2920                 if (con_driver_map[i])
2921                         module_put(con_driver_map[i]->owner);
2922                 __module_get(owner);
2923                 con_driver_map[i] = csw;
2924
2925                 if (!vc || !vc->vc_sw)
2926                         continue;
2927
2928                 j = i;
2929
2930                 if (CON_IS_VISIBLE(vc)) {
2931                         k = i;
2932                         save_screen(vc);
2933                 }
2934
2935                 old_was_color = vc->vc_can_do_color;
2936                 vc->vc_sw->con_deinit(vc);
2937                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2938                 visual_init(vc, i, 0);
2939                 set_origin(vc);
2940                 update_attr(vc);
2941
2942                 /* If the console changed between mono <-> color, then
2943                  * the attributes in the screenbuf will be wrong.  The
2944                  * following resets all attributes to something sane.
2945                  */
2946                 if (old_was_color != vc->vc_can_do_color)
2947                         clear_buffer_attributes(vc);
2948         }
2949
2950         printk("Console: switching ");
2951         if (!deflt)
2952                 printk("consoles %d-%d ", first+1, last+1);
2953         if (j >= 0) {
2954                 struct vc_data *vc = vc_cons[j].d;
2955
2956                 printk("to %s %s %dx%d\n",
2957                        vc->vc_can_do_color ? "colour" : "mono",
2958                        desc, vc->vc_cols, vc->vc_rows);
2959
2960                 if (k >= 0) {
2961                         vc = vc_cons[k].d;
2962                         update_screen(vc);
2963                 }
2964         } else
2965                 printk("to %s\n", desc);
2966
2967         retval = 0;
2968 err:
2969         release_console_sem();
2970         module_put(owner);
2971         return retval;
2972 };
2973
2974 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2975 static int con_is_graphics(const struct consw *csw, int first, int last)
2976 {
2977         int i, retval = 0;
2978
2979         for (i = first; i <= last; i++) {
2980                 struct vc_data *vc = vc_cons[i].d;
2981
2982                 if (vc && vc->vc_mode == KD_GRAPHICS) {
2983                         retval = 1;
2984                         break;
2985                 }
2986         }
2987
2988         return retval;
2989 }
2990
2991 static int unbind_con_driver(const struct consw *csw, int first, int last,
2992                              int deflt)
2993 {
2994         struct module *owner = csw->owner;
2995         const struct consw *defcsw = NULL;
2996         struct con_driver *con_driver = NULL, *con_back = NULL;
2997         int i, retval = -ENODEV;
2998
2999         if (!try_module_get(owner))
3000                 return -ENODEV;
3001
3002         acquire_console_sem();
3003
3004         /* check if driver is registered and if it is unbindable */
3005         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3006                 con_driver = &registered_con_driver[i];
3007
3008                 if (con_driver->con == csw &&
3009                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3010                         retval = 0;
3011                         break;
3012                 }
3013         }
3014
3015         if (retval) {
3016                 release_console_sem();
3017                 goto err;
3018         }
3019
3020         retval = -ENODEV;
3021
3022         /* check if backup driver exists */
3023         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3024                 con_back = &registered_con_driver[i];
3025
3026                 if (con_back->con &&
3027                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3028                         defcsw = con_back->con;
3029                         retval = 0;
3030                         break;
3031                 }
3032         }
3033
3034         if (retval) {
3035                 release_console_sem();
3036                 goto err;
3037         }
3038
3039         if (!con_is_bound(csw)) {
3040                 release_console_sem();
3041                 goto err;
3042         }
3043
3044         first = max(first, con_driver->first);
3045         last = min(last, con_driver->last);
3046
3047         for (i = first; i <= last; i++) {
3048                 if (con_driver_map[i] == csw) {
3049                         module_put(csw->owner);
3050                         con_driver_map[i] = NULL;
3051                 }
3052         }
3053
3054         if (!con_is_bound(defcsw)) {
3055                 const struct consw *defconsw = conswitchp;
3056
3057                 defcsw->con_startup();
3058                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3059                 /*
3060                  * vgacon may change the default driver to point
3061                  * to dummycon, we restore it here...
3062                  */
3063                 conswitchp = defconsw;
3064         }
3065
3066         if (!con_is_bound(csw))
3067                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3068
3069         release_console_sem();
3070         /* ignore return value, binding should not fail */
3071         bind_con_driver(defcsw, first, last, deflt);
3072 err:
3073         module_put(owner);
3074         return retval;
3075
3076 }
3077
3078 static int vt_bind(struct con_driver *con)
3079 {
3080         const struct consw *defcsw = NULL, *csw = NULL;
3081         int i, more = 1, first = -1, last = -1, deflt = 0;
3082
3083         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3084             con_is_graphics(con->con, con->first, con->last))
3085                 goto err;
3086
3087         csw = con->con;
3088
3089         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3090                 struct con_driver *con = &registered_con_driver[i];
3091
3092                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3093                         defcsw = con->con;
3094                         break;
3095                 }
3096         }
3097
3098         if (!defcsw)
3099                 goto err;
3100
3101         while (more) {
3102                 more = 0;
3103
3104                 for (i = con->first; i <= con->last; i++) {
3105                         if (con_driver_map[i] == defcsw) {
3106                                 if (first == -1)
3107                                         first = i;
3108                                 last = i;
3109                                 more = 1;
3110                         } else if (first != -1)
3111                                 break;
3112                 }
3113
3114                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3115                         deflt = 1;
3116
3117                 if (first != -1)
3118                         bind_con_driver(csw, first, last, deflt);
3119
3120                 first = -1;
3121                 last = -1;
3122                 deflt = 0;
3123         }
3124
3125 err:
3126         return 0;
3127 }
3128
3129 static int vt_unbind(struct con_driver *con)
3130 {
3131         const struct consw *csw = NULL;
3132         int i, more = 1, first = -1, last = -1, deflt = 0;
3133
3134         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3135             con_is_graphics(con->con, con->first, con->last))
3136                 goto err;
3137
3138         csw = con->con;
3139
3140         while (more) {
3141                 more = 0;
3142
3143                 for (i = con->first; i <= con->last; i++) {
3144                         if (con_driver_map[i] == csw) {
3145                                 if (first == -1)
3146                                         first = i;
3147                                 last = i;
3148                                 more = 1;
3149                         } else if (first != -1)
3150                                 break;
3151                 }
3152
3153                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3154                         deflt = 1;
3155
3156                 if (first != -1)
3157                         unbind_con_driver(csw, first, last, deflt);
3158
3159                 first = -1;
3160                 last = -1;
3161                 deflt = 0;
3162         }
3163
3164 err:
3165         return 0;
3166 }
3167 #else
3168 static inline int vt_bind(struct con_driver *con)
3169 {
3170         return 0;
3171 }
3172 static inline int vt_unbind(struct con_driver *con)
3173 {
3174         return 0;
3175 }
3176 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3177
3178 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3179                           const char *buf, size_t count)
3180 {
3181         struct con_driver *con = dev_get_drvdata(dev);
3182         int bind = simple_strtoul(buf, NULL, 0);
3183
3184         if (bind)
3185                 vt_bind(con);
3186         else
3187                 vt_unbind(con);
3188
3189         return count;
3190 }
3191
3192 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3193                          char *buf)
3194 {
3195         struct con_driver *con = dev_get_drvdata(dev);
3196         int bind = con_is_bound(con->con);
3197
3198         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3199 }
3200
3201 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3202                          char *buf)
3203 {
3204         struct con_driver *con = dev_get_drvdata(dev);
3205
3206         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3207                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3208                          con->desc);
3209
3210 }
3211
3212 static struct device_attribute device_attrs[] = {
3213         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3214         __ATTR(name, S_IRUGO, show_name, NULL),
3215 };
3216
3217 static int vtconsole_init_device(struct con_driver *con)
3218 {
3219         int i;
3220         int error = 0;
3221
3222         con->flag |= CON_DRIVER_FLAG_ATTR;
3223         dev_set_drvdata(con->dev, con);
3224         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3225                 error = device_create_file(con->dev, &device_attrs[i]);
3226                 if (error)
3227                         break;
3228         }
3229
3230         if (error) {
3231                 while (--i >= 0)
3232                         device_remove_file(con->dev, &device_attrs[i]);
3233                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3234         }
3235
3236         return error;
3237 }
3238
3239 static void vtconsole_deinit_device(struct con_driver *con)
3240 {
3241         int i;
3242
3243         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3244                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3245                         device_remove_file(con->dev, &device_attrs[i]);
3246                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3247         }
3248 }
3249
3250 /**
3251  * con_is_bound - checks if driver is bound to the console
3252  * @csw: console driver
3253  *
3254  * RETURNS: zero if unbound, nonzero if bound
3255  *
3256  * Drivers can call this and if zero, they should release
3257  * all resources allocated on con_startup()
3258  */
3259 int con_is_bound(const struct consw *csw)
3260 {
3261         int i, bound = 0;
3262
3263         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3264                 if (con_driver_map[i] == csw) {
3265                         bound = 1;
3266                         break;
3267                 }
3268         }
3269
3270         return bound;
3271 }
3272 EXPORT_SYMBOL(con_is_bound);
3273
3274 /**
3275  * register_con_driver - register console driver to console layer
3276  * @csw: console driver
3277  * @first: the first console to take over, minimum value is 0
3278  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3279  *
3280  * DESCRIPTION: This function registers a console driver which can later
3281  * bind to a range of consoles specified by @first and @last. It will
3282  * also initialize the console driver by calling con_startup().
3283  */
3284 int register_con_driver(const struct consw *csw, int first, int last)
3285 {
3286         struct module *owner = csw->owner;
3287         struct con_driver *con_driver;
3288         const char *desc;
3289         int i, retval = 0;
3290
3291         if (!try_module_get(owner))
3292                 return -ENODEV;
3293
3294         acquire_console_sem();
3295
3296         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3297                 con_driver = &registered_con_driver[i];
3298
3299                 /* already registered */
3300                 if (con_driver->con == csw)
3301                         retval = -EINVAL;
3302         }
3303
3304         if (retval)
3305                 goto err;
3306
3307         desc = csw->con_startup();
3308
3309         if (!desc)
3310                 goto err;
3311
3312         retval = -EINVAL;
3313
3314         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3315                 con_driver = &registered_con_driver[i];
3316
3317                 if (con_driver->con == NULL) {
3318                         con_driver->con = csw;
3319                         con_driver->desc = desc;
3320                         con_driver->node = i;
3321                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3322                                            CON_DRIVER_FLAG_INIT;
3323                         con_driver->first = first;
3324                         con_driver->last = last;
3325                         retval = 0;
3326                         break;
3327                 }
3328         }
3329
3330         if (retval)
3331                 goto err;
3332
3333         con_driver->dev = device_create(vtconsole_class, NULL,
3334                                         MKDEV(0, con_driver->node),
3335                                         "vtcon%i", con_driver->node);
3336
3337         if (IS_ERR(con_driver->dev)) {
3338                 printk(KERN_WARNING "Unable to create device for %s; "
3339                        "errno = %ld\n", con_driver->desc,
3340                        PTR_ERR(con_driver->dev));
3341                 con_driver->dev = NULL;
3342         } else {
3343                 vtconsole_init_device(con_driver);
3344         }
3345
3346 err:
3347         release_console_sem();
3348         module_put(owner);
3349         return retval;
3350 }
3351 EXPORT_SYMBOL(register_con_driver);
3352
3353 /**
3354  * unregister_con_driver - unregister console driver from console layer
3355  * @csw: console driver
3356  *
3357  * DESCRIPTION: All drivers that registers to the console layer must
3358  * call this function upon exit, or if the console driver is in a state
3359  * where it won't be able to handle console services, such as the
3360  * framebuffer console without loaded framebuffer drivers.
3361  *
3362  * The driver must unbind first prior to unregistration.
3363  */
3364 int unregister_con_driver(const struct consw *csw)
3365 {
3366         int i, retval = -ENODEV;
3367
3368         acquire_console_sem();
3369
3370         /* cannot unregister a bound driver */
3371         if (con_is_bound(csw))
3372                 goto err;
3373
3374         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3375                 struct con_driver *con_driver = &registered_con_driver[i];
3376
3377                 if (con_driver->con == csw &&
3378                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3379                         vtconsole_deinit_device(con_driver);
3380                         device_destroy(vtconsole_class,
3381                                        MKDEV(0, con_driver->node));
3382                         con_driver->con = NULL;
3383                         con_driver->desc = NULL;
3384                         con_driver->dev = NULL;
3385                         con_driver->node = 0;
3386                         con_driver->flag = 0;
3387                         con_driver->first = 0;
3388                         con_driver->last = 0;
3389                         retval = 0;
3390                         break;
3391                 }
3392         }
3393 err:
3394         release_console_sem();
3395         return retval;
3396 }
3397 EXPORT_SYMBOL(unregister_con_driver);
3398
3399 /*
3400  *      If we support more console drivers, this function is used
3401  *      when a driver wants to take over some existing consoles
3402  *      and become default driver for newly opened ones.
3403  *
3404  *      take_over_console is basically a register followed by unbind
3405  */
3406 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3407 {
3408         int err;
3409
3410         err = register_con_driver(csw, first, last);
3411
3412         if (!err)
3413                 bind_con_driver(csw, first, last, deflt);
3414
3415         return err;
3416 }
3417
3418 /*
3419  * give_up_console is a wrapper to unregister_con_driver. It will only
3420  * work if driver is fully unbound.
3421  */
3422 void give_up_console(const struct consw *csw)
3423 {
3424         unregister_con_driver(csw);
3425 }
3426
3427 static int __init vtconsole_class_init(void)
3428 {
3429         int i;
3430
3431         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3432         if (IS_ERR(vtconsole_class)) {
3433                 printk(KERN_WARNING "Unable to create vt console class; "
3434                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3435                 vtconsole_class = NULL;
3436         }
3437
3438         /* Add system drivers to sysfs */
3439         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3440                 struct con_driver *con = &registered_con_driver[i];
3441
3442                 if (con->con && !con->dev) {
3443                         con->dev = device_create(vtconsole_class, NULL,
3444                                                  MKDEV(0, con->node),
3445                                                  "vtcon%i", con->node);
3446
3447                         if (IS_ERR(con->dev)) {
3448                                 printk(KERN_WARNING "Unable to create "
3449                                        "device for %s; errno = %ld\n",
3450                                        con->desc, PTR_ERR(con->dev));
3451                                 con->dev = NULL;
3452                         } else {
3453                                 vtconsole_init_device(con);
3454                         }
3455                 }
3456         }
3457
3458         return 0;
3459 }
3460 postcore_initcall(vtconsole_class_init);
3461
3462 #endif
3463
3464 /*
3465  *      Screen blanking
3466  */
3467
3468 static int set_vesa_blanking(char __user *p)
3469 {
3470         unsigned int mode;
3471
3472         if (get_user(mode, p + 1))
3473                 return -EFAULT;
3474
3475         vesa_blank_mode = (mode < 4) ? mode : 0;
3476         return 0;
3477 }
3478
3479 void do_blank_screen(int entering_gfx)
3480 {
3481         struct vc_data *vc = vc_cons[fg_console].d;
3482         int i;
3483
3484         WARN_CONSOLE_UNLOCKED();
3485
3486         if (console_blanked) {
3487                 if (blank_state == blank_vesa_wait) {
3488                         blank_state = blank_off;
3489                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3490                 }
3491                 return;
3492         }
3493         if (blank_state != blank_normal_wait)
3494                 return;
3495         blank_state = blank_off;
3496
3497         /* entering graphics mode? */
3498         if (entering_gfx) {
3499                 hide_cursor(vc);
3500                 save_screen(vc);
3501                 vc->vc_sw->con_blank(vc, -1, 1);
3502                 console_blanked = fg_console + 1;
3503                 set_origin(vc);
3504                 return;
3505         }
3506
3507         /* don't blank graphics */
3508         if (vc->vc_mode != KD_TEXT) {
3509                 console_blanked = fg_console + 1;
3510                 return;
3511         }
3512
3513         hide_cursor(vc);
3514         del_timer_sync(&console_timer);
3515         blank_timer_expired = 0;
3516
3517         save_screen(vc);
3518         /* In case we need to reset origin, blanking hook returns 1 */
3519         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3520         console_blanked = fg_console + 1;
3521         if (i)
3522                 set_origin(vc);
3523
3524         if (console_blank_hook && console_blank_hook(1))
3525                 return;
3526
3527         if (vesa_off_interval && vesa_blank_mode) {
3528                 blank_state = blank_vesa_wait;
3529                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3530         }
3531 }
3532 EXPORT_SYMBOL(do_blank_screen);
3533
3534 /*
3535  * Called by timer as well as from vt_console_driver
3536  */
3537 void do_unblank_screen(int leaving_gfx)
3538 {
3539         struct vc_data *vc;
3540
3541         /* This should now always be called from a "sane" (read: can schedule)
3542          * context for the sake of the low level drivers, except in the special
3543          * case of oops_in_progress
3544          */
3545         if (!oops_in_progress)
3546                 might_sleep();
3547
3548         WARN_CONSOLE_UNLOCKED();
3549
3550         ignore_poke = 0;
3551         if (!console_blanked)
3552                 return;
3553         if (!vc_cons_allocated(fg_console)) {
3554                 /* impossible */
3555                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3556                 return;
3557         }
3558         vc = vc_cons[fg_console].d;
3559         if (vc->vc_mode != KD_TEXT)
3560                 return; /* but leave console_blanked != 0 */
3561
3562         if (blankinterval) {
3563                 mod_timer(&console_timer, jiffies + blankinterval);
3564                 blank_state = blank_normal_wait;
3565         }
3566
3567         console_blanked = 0;
3568         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3569                 /* Low-level driver cannot restore -> do it ourselves */
3570                 update_screen(vc);
3571         if (console_blank_hook)
3572                 console_blank_hook(0);
3573         set_palette(vc);
3574         set_cursor(vc);
3575 }
3576 EXPORT_SYMBOL(do_unblank_screen);
3577
3578 /*
3579  * This is called by the outside world to cause a forced unblank, mostly for
3580  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3581  * call it with 1 as an argument and so force a mode restore... that may kill
3582  * X or at least garbage the screen but would also make the Oops visible...
3583  */
3584 void unblank_screen(void)
3585 {
3586         do_unblank_screen(0);
3587 }
3588
3589 /*
3590  * We defer the timer blanking to work queue so it can take the console mutex
3591  * (console operations can still happen at irq time, but only from printk which
3592  * has the console mutex. Not perfect yet, but better than no locking
3593  */
3594 static void blank_screen_t(unsigned long dummy)
3595 {
3596         if (unlikely(!keventd_up())) {
3597                 mod_timer(&console_timer, jiffies + blankinterval);
3598                 return;
3599         }
3600         blank_timer_expired = 1;
3601         schedule_work(&console_work);
3602 }
3603
3604 void poke_blanked_console(void)
3605 {
3606         WARN_CONSOLE_UNLOCKED();
3607
3608         /* Add this so we quickly catch whoever might call us in a non
3609          * safe context. Nowadays, unblank_screen() isn't to be called in
3610          * atomic contexts and is allowed to schedule (with the special case
3611          * of oops_in_progress, but that isn't of any concern for this
3612          * function. --BenH.
3613          */
3614         might_sleep();
3615
3616         /* This isn't perfectly race free, but a race here would be mostly harmless,
3617          * at worse, we'll do a spurrious blank and it's unlikely
3618          */
3619         del_timer(&console_timer);
3620         blank_timer_expired = 0;
3621
3622         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3623                 return;
3624         if (console_blanked)
3625                 unblank_screen();
3626         else if (blankinterval) {
3627                 mod_timer(&console_timer, jiffies + blankinterval);
3628                 blank_state = blank_normal_wait;
3629         }
3630 }
3631
3632 /*
3633  *      Palettes
3634  */
3635
3636 static void set_palette(struct vc_data *vc)
3637 {
3638         WARN_CONSOLE_UNLOCKED();
3639
3640         if (vc->vc_mode != KD_GRAPHICS)
3641                 vc->vc_sw->con_set_palette(vc, color_table);
3642 }
3643
3644 static int set_get_cmap(unsigned char __user *arg, int set)
3645 {
3646     int i, j, k;
3647
3648     WARN_CONSOLE_UNLOCKED();
3649
3650     for (i = 0; i < 16; i++)
3651         if (set) {
3652             get_user(default_red[i], arg++);
3653             get_user(default_grn[i], arg++);
3654             get_user(default_blu[i], arg++);
3655         } else {
3656             put_user(default_red[i], arg++);
3657             put_user(default_grn[i], arg++);
3658             put_user(default_blu[i], arg++);
3659         }
3660     if (set) {
3661         for (i = 0; i < MAX_NR_CONSOLES; i++)
3662             if (vc_cons_allocated(i)) {
3663                 for (j = k = 0; j < 16; j++) {
3664                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3665                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3666                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3667                 }
3668                 set_palette(vc_cons[i].d);
3669             }
3670     }
3671     return 0;
3672 }
3673
3674 /*
3675  * Load palette into the DAC registers. arg points to a colour
3676  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3677  */
3678
3679 int con_set_cmap(unsigned char __user *arg)
3680 {
3681         int rc;
3682
3683         acquire_console_sem();
3684         rc = set_get_cmap (arg,1);
3685         release_console_sem();
3686
3687         return rc;
3688 }
3689
3690 int con_get_cmap(unsigned char __user *arg)
3691 {
3692         int rc;
3693
3694         acquire_console_sem();
3695         rc = set_get_cmap (arg,0);
3696         release_console_sem();
3697
3698         return rc;
3699 }
3700
3701 void reset_palette(struct vc_data *vc)
3702 {
3703         int j, k;
3704         for (j=k=0; j<16; j++) {
3705                 vc->vc_palette[k++] = default_red[j];
3706                 vc->vc_palette[k++] = default_grn[j];
3707                 vc->vc_palette[k++] = default_blu[j];
3708         }
3709         set_palette(vc);
3710 }
3711
3712 /*
3713  *  Font switching
3714  *
3715  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3716  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 
3717  *  depending on width) reserved for each character which is kinda wasty, but 
3718  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It 
3719  *  is upto the actual low-level console-driver convert data into its favorite
3720  *  format (maybe we should add a `fontoffset' field to the `display'
3721  *  structure so we won't have to convert the fontdata all the time.
3722  *  /Jes
3723  */
3724
3725 #define max_font_size 65536
3726
3727 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3728 {
3729         struct console_font font;
3730         int rc = -EINVAL;
3731         int c;
3732
3733         if (vc->vc_mode != KD_TEXT)
3734                 return -EINVAL;
3735
3736         if (op->data) {
3737                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3738                 if (!font.data)
3739                         return -ENOMEM;
3740         } else
3741                 font.data = NULL;
3742
3743         acquire_console_sem();
3744         if (vc->vc_sw->con_font_get)
3745                 rc = vc->vc_sw->con_font_get(vc, &font);
3746         else
3747                 rc = -ENOSYS;
3748         release_console_sem();
3749
3750         if (rc)
3751                 goto out;
3752
3753         c = (font.width+7)/8 * 32 * font.charcount;
3754         
3755         if (op->data && font.charcount > op->charcount)
3756                 rc = -ENOSPC;
3757         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3758                 if (font.width > op->width || font.height > op->height) 
3759                         rc = -ENOSPC;
3760         } else {
3761                 if (font.width != 8)
3762                         rc = -EIO;
3763                 else if ((op->height && font.height > op->height) ||
3764                          font.height > 32)
3765                         rc = -ENOSPC;
3766         }
3767         if (rc)
3768                 goto out;
3769
3770         op->height = font.height;
3771         op->width = font.width;
3772         op->charcount = font.charcount;
3773
3774         if (op->data && copy_to_user(op->data, font.data, c))
3775                 rc = -EFAULT;
3776
3777 out:
3778         kfree(font.data);
3779         return rc;
3780 }
3781
3782 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3783 {
3784         struct console_font font;
3785         int rc = -EINVAL;
3786         int size;
3787
3788         if (vc->vc_mode != KD_TEXT)
3789                 return -EINVAL;
3790         if (!op->data)
3791                 return -EINVAL;
3792         if (op->charcount > 512)
3793                 return -EINVAL;
3794         if (!op->height) {              /* Need to guess font height [compat] */
3795                 int h, i;
3796                 u8 __user *charmap = op->data;
3797                 u8 tmp;
3798                 
3799                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3800                    so that we can get rid of this soon */
3801                 if (!(op->flags & KD_FONT_FLAG_OLD))
3802                         return -EINVAL;
3803                 for (h = 32; h > 0; h--)
3804                         for (i = 0; i < op->charcount; i++) {
3805                                 if (get_user(tmp, &charmap[32*i+h-1]))
3806                                         return -EFAULT;
3807                                 if (tmp)
3808                                         goto nonzero;
3809                         }
3810                 return -EINVAL;
3811         nonzero:
3812                 op->height = h;
3813         }
3814         if (op->width <= 0 || op->width > 32 || op->height > 32)
3815                 return -EINVAL;
3816         size = (op->width+7)/8 * 32 * op->charcount;
3817         if (size > max_font_size)
3818                 return -ENOSPC;
3819         font.charcount = op->charcount;
3820         font.height = op->height;
3821         font.width = op->width;
3822         font.data = kmalloc(size, GFP_KERNEL);
3823         if (!font.data)
3824                 return -ENOMEM;
3825         if (copy_from_user(font.data, op->data, size)) {
3826                 kfree(font.data);
3827                 return -EFAULT;
3828         }
3829         acquire_console_sem();
3830         if (vc->vc_sw->con_font_set)
3831                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3832         else
3833                 rc = -ENOSYS;
3834         release_console_sem();
3835         kfree(font.data);
3836         return rc;
3837 }
3838
3839 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3840 {
3841         struct console_font font = {.width = op->width, .height = op->height};
3842         char name[MAX_FONT_NAME];
3843         char *s = name;
3844         int rc;
3845
3846         if (vc->vc_mode != KD_TEXT)
3847                 return -EINVAL;
3848
3849         if (!op->data)
3850                 s = NULL;
3851         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3852                 return -EFAULT;
3853         else
3854                 name[MAX_FONT_NAME - 1] = 0;
3855
3856         acquire_console_sem();
3857         if (vc->vc_sw->con_font_default)
3858                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3859         else
3860                 rc = -ENOSYS;
3861         release_console_sem();
3862         if (!rc) {
3863                 op->width = font.width;
3864                 op->height = font.height;
3865         }
3866         return rc;
3867 }
3868
3869 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3870 {
3871         int con = op->height;
3872         int rc;
3873
3874         if (vc->vc_mode != KD_TEXT)
3875                 return -EINVAL;
3876
3877         acquire_console_sem();
3878         if (!vc->vc_sw->con_font_copy)
3879                 rc = -ENOSYS;
3880         else if (con < 0 || !vc_cons_allocated(con))
3881                 rc = -ENOTTY;
3882         else if (con == vc->vc_num)     /* nothing to do */
3883                 rc = 0;
3884         else
3885                 rc = vc->vc_sw->con_font_copy(vc, con);
3886         release_console_sem();
3887         return rc;
3888 }
3889
3890 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3891 {
3892         switch (op->op) {
3893         case KD_FONT_OP_SET:
3894                 return con_font_set(vc, op);
3895         case KD_FONT_OP_GET:
3896                 return con_font_get(vc, op);
3897         case KD_FONT_OP_SET_DEFAULT:
3898                 return con_font_default(vc, op);
3899         case KD_FONT_OP_COPY:
3900                 return con_font_copy(vc, op);
3901         }
3902         return -ENOSYS;
3903 }
3904
3905 /*
3906  *      Interface exported to selection and vcs.
3907  */
3908
3909 /* used by selection */
3910 u16 screen_glyph(struct vc_data *vc, int offset)
3911 {
3912         u16 w = scr_readw(screenpos(vc, offset, 1));
3913         u16 c = w & 0xff;
3914
3915         if (w & vc->vc_hi_font_mask)
3916                 c |= 0x100;
3917         return c;
3918 }
3919
3920 /* used by vcs - note the word offset */
3921 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3922 {
3923         return screenpos(vc, 2 * w_offset, viewed);
3924 }
3925
3926 void getconsxy(struct vc_data *vc, unsigned char *p)
3927 {
3928         p[0] = vc->vc_x;
3929         p[1] = vc->vc_y;
3930 }
3931
3932 void putconsxy(struct vc_data *vc, unsigned char *p)
3933 {
3934         hide_cursor(vc);
3935         gotoxy(vc, p[0], p[1]);
3936         set_cursor(vc);
3937 }
3938
3939 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3940 {
3941         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3942                 return softcursor_original;
3943         return scr_readw(org);
3944 }
3945
3946 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3947 {
3948         scr_writew(val, org);
3949         if ((unsigned long)org == vc->vc_pos) {
3950                 softcursor_original = -1;
3951                 add_softcursor(vc);
3952         }
3953 }
3954
3955 /*
3956  *      Visible symbols for modules
3957  */
3958
3959 EXPORT_SYMBOL(color_table);
3960 EXPORT_SYMBOL(default_red);
3961 EXPORT_SYMBOL(default_grn);
3962 EXPORT_SYMBOL(default_blu);
3963 EXPORT_SYMBOL(update_region);
3964 EXPORT_SYMBOL(redraw_screen);
3965 EXPORT_SYMBOL(vc_resize);
3966 EXPORT_SYMBOL(vc_lock_resize);
3967 EXPORT_SYMBOL(fg_console);
3968 EXPORT_SYMBOL(console_blank_hook);
3969 EXPORT_SYMBOL(console_blanked);
3970 EXPORT_SYMBOL(vc_cons);
3971 #ifndef VT_SINGLE_DRIVER
3972 EXPORT_SYMBOL(take_over_console);
3973 EXPORT_SYMBOL(give_up_console);
3974 #endif