vt/vgacon: Check if screen resize request comes from userspace
[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                                 int user)
755 {
756         /* Resizes the resolution of the display adapater */
757         int err = 0;
758
759         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
760                 err = vc->vc_sw->con_resize(vc, width, height, user);
761
762         return err;
763 }
764
765 /*
766  * Change # of rows and columns (0 means unchanged/the size of fg_console)
767  * [this is to be used together with some user program
768  * like resize that changes the hardware videomode]
769  */
770 #define VC_RESIZE_MAXCOL (32767)
771 #define VC_RESIZE_MAXROW (32767)
772 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
773 {
774         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
775         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
776         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
777         unsigned int end, user;
778         unsigned short *newscreen;
779
780         WARN_CONSOLE_UNLOCKED();
781
782         if (!vc)
783                 return -ENXIO;
784
785         user = vc->vc_resize_user;
786         vc->vc_resize_user = 0;
787
788         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
789                 return -EINVAL;
790
791         new_cols = (cols ? cols : vc->vc_cols);
792         new_rows = (lines ? lines : vc->vc_rows);
793         new_row_size = new_cols << 1;
794         new_screen_size = new_row_size * new_rows;
795
796         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
797                 return 0;
798
799         newscreen = kmalloc(new_screen_size, GFP_USER);
800         if (!newscreen)
801                 return -ENOMEM;
802
803         old_rows = vc->vc_rows;
804         old_cols = vc->vc_cols;
805         old_row_size = vc->vc_size_row;
806         old_screen_size = vc->vc_screenbuf_size;
807
808         err = resize_screen(vc, new_cols, new_rows, user);
809         if (err) {
810                 kfree(newscreen);
811                 return err;
812         }
813
814         vc->vc_rows = new_rows;
815         vc->vc_cols = new_cols;
816         vc->vc_size_row = new_row_size;
817         vc->vc_screenbuf_size = new_screen_size;
818
819         rlth = min(old_row_size, new_row_size);
820         rrem = new_row_size - rlth;
821         old_origin = vc->vc_origin;
822         new_origin = (long) newscreen;
823         new_scr_end = new_origin + new_screen_size;
824
825         if (vc->vc_y > new_rows) {
826                 if (old_rows - vc->vc_y < new_rows) {
827                         /*
828                          * Cursor near the bottom, copy contents from the
829                          * bottom of buffer
830                          */
831                         old_origin += (old_rows - new_rows) * old_row_size;
832                         end = vc->vc_scr_end;
833                 } else {
834                         /*
835                          * Cursor is in no man's land, copy 1/2 screenful
836                          * from the top and bottom of cursor position
837                          */
838                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
839                         end = old_origin + (old_row_size * new_rows);
840                 }
841         } else
842                 /*
843                  * Cursor near the top, copy contents from the top of buffer
844                  */
845                 end = (old_rows > new_rows) ? old_origin +
846                         (old_row_size * new_rows) :
847                         vc->vc_scr_end;
848
849         update_attr(vc);
850
851         while (old_origin < end) {
852                 scr_memcpyw((unsigned short *) new_origin,
853                             (unsigned short *) old_origin, rlth);
854                 if (rrem)
855                         scr_memsetw((void *)(new_origin + rlth),
856                                     vc->vc_video_erase_char, rrem);
857                 old_origin += old_row_size;
858                 new_origin += new_row_size;
859         }
860         if (new_scr_end > new_origin)
861                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
862                             new_scr_end - new_origin);
863         if (vc->vc_kmalloced)
864                 kfree(vc->vc_screenbuf);
865         vc->vc_screenbuf = newscreen;
866         vc->vc_kmalloced = 1;
867         vc->vc_screenbuf_size = new_screen_size;
868         set_origin(vc);
869
870         /* do part of a reset_terminal() */
871         vc->vc_top = 0;
872         vc->vc_bottom = vc->vc_rows;
873         gotoxy(vc, vc->vc_x, vc->vc_y);
874         save_cur(vc);
875
876         if (vc->vc_tty) {
877                 struct winsize ws, *cws = &vc->vc_tty->winsize;
878
879                 memset(&ws, 0, sizeof(ws));
880                 ws.ws_row = vc->vc_rows;
881                 ws.ws_col = vc->vc_cols;
882                 ws.ws_ypixel = vc->vc_scan_lines;
883                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
884                     vc->vc_tty->pgrp)
885                         kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
886                 *cws = ws;
887         }
888
889         if (CON_IS_VISIBLE(vc))
890                 update_screen(vc);
891         return err;
892 }
893
894 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
895 {
896         int rc;
897
898         acquire_console_sem();
899         rc = vc_resize(vc, cols, lines);
900         release_console_sem();
901         return rc;
902 }
903
904 void vc_deallocate(unsigned int currcons)
905 {
906         WARN_CONSOLE_UNLOCKED();
907
908         if (vc_cons_allocated(currcons)) {
909                 struct vc_data *vc = vc_cons[currcons].d;
910                 vc->vc_sw->con_deinit(vc);
911                 put_pid(vc->vt_pid);
912                 module_put(vc->vc_sw->owner);
913                 if (vc->vc_kmalloced)
914                         kfree(vc->vc_screenbuf);
915                 if (currcons >= MIN_NR_CONSOLES)
916                         kfree(vc);
917                 vc_cons[currcons].d = NULL;
918         }
919 }
920
921 /*
922  *      VT102 emulator
923  */
924
925 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
926 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
927 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
928
929 #define decarm          VC_REPEAT
930 #define decckm          VC_CKMODE
931 #define kbdapplic       VC_APPLIC
932 #define lnm             VC_CRLF
933
934 /*
935  * this is what the terminal answers to a ESC-Z or csi0c query.
936  */
937 #define VT100ID "\033[?1;2c"
938 #define VT102ID "\033[?6c"
939
940 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
941                                        8,12,10,14, 9,13,11,15 };
942
943 /* the default colour table, for VGA+ colour systems */
944 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
945     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
946 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
947     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
948 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
949     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
950
951 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
952 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
953 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
954
955 /*
956  * gotoxy() must verify all boundaries, because the arguments
957  * might also be negative. If the given position is out of
958  * bounds, the cursor is placed at the nearest margin.
959  */
960 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
961 {
962         int min_y, max_y;
963
964         if (new_x < 0)
965                 vc->vc_x = 0;
966         else {
967                 if (new_x >= vc->vc_cols)
968                         vc->vc_x = vc->vc_cols - 1;
969                 else
970                         vc->vc_x = new_x;
971         }
972
973         if (vc->vc_decom) {
974                 min_y = vc->vc_top;
975                 max_y = vc->vc_bottom;
976         } else {
977                 min_y = 0;
978                 max_y = vc->vc_rows;
979         }
980         if (new_y < min_y)
981                 vc->vc_y = min_y;
982         else if (new_y >= max_y)
983                 vc->vc_y = max_y - 1;
984         else
985                 vc->vc_y = new_y;
986         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
987         vc->vc_need_wrap = 0;
988 }
989
990 /* for absolute user moves, when decom is set */
991 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
992 {
993         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
994 }
995
996 void scrollback(struct vc_data *vc, int lines)
997 {
998         if (!lines)
999                 lines = vc->vc_rows / 2;
1000         scrolldelta(-lines);
1001 }
1002
1003 void scrollfront(struct vc_data *vc, int lines)
1004 {
1005         if (!lines)
1006                 lines = vc->vc_rows / 2;
1007         scrolldelta(lines);
1008 }
1009
1010 static void lf(struct vc_data *vc)
1011 {
1012         /* don't scroll if above bottom of scrolling region, or
1013          * if below scrolling region
1014          */
1015         if (vc->vc_y + 1 == vc->vc_bottom)
1016                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1017         else if (vc->vc_y < vc->vc_rows - 1) {
1018                 vc->vc_y++;
1019                 vc->vc_pos += vc->vc_size_row;
1020         }
1021         vc->vc_need_wrap = 0;
1022 }
1023
1024 static void ri(struct vc_data *vc)
1025 {
1026         /* don't scroll if below top of scrolling region, or
1027          * if above scrolling region
1028          */
1029         if (vc->vc_y == vc->vc_top)
1030                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1031         else if (vc->vc_y > 0) {
1032                 vc->vc_y--;
1033                 vc->vc_pos -= vc->vc_size_row;
1034         }
1035         vc->vc_need_wrap = 0;
1036 }
1037
1038 static inline void cr(struct vc_data *vc)
1039 {
1040         vc->vc_pos -= vc->vc_x << 1;
1041         vc->vc_need_wrap = vc->vc_x = 0;
1042 }
1043
1044 static inline void bs(struct vc_data *vc)
1045 {
1046         if (vc->vc_x) {
1047                 vc->vc_pos -= 2;
1048                 vc->vc_x--;
1049                 vc->vc_need_wrap = 0;
1050         }
1051 }
1052
1053 static inline void del(struct vc_data *vc)
1054 {
1055         /* ignored */
1056 }
1057
1058 static void csi_J(struct vc_data *vc, int vpar)
1059 {
1060         unsigned int count;
1061         unsigned short * start;
1062
1063         switch (vpar) {
1064                 case 0: /* erase from cursor to end of display */
1065                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1066                         start = (unsigned short *)vc->vc_pos;
1067                         if (DO_UPDATE(vc)) {
1068                                 /* do in two stages */
1069                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1070                                               vc->vc_cols - vc->vc_x);
1071                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1072                                               vc->vc_rows - vc->vc_y - 1,
1073                                               vc->vc_cols);
1074                         }
1075                         break;
1076                 case 1: /* erase from start to cursor */
1077                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1078                         start = (unsigned short *)vc->vc_origin;
1079                         if (DO_UPDATE(vc)) {
1080                                 /* do in two stages */
1081                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1082                                               vc->vc_cols);
1083                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1084                                               vc->vc_x + 1);
1085                         }
1086                         break;
1087                 case 2: /* erase whole display */
1088                         count = vc->vc_cols * vc->vc_rows;
1089                         start = (unsigned short *)vc->vc_origin;
1090                         if (DO_UPDATE(vc))
1091                                 vc->vc_sw->con_clear(vc, 0, 0,
1092                                               vc->vc_rows,
1093                                               vc->vc_cols);
1094                         break;
1095                 default:
1096                         return;
1097         }
1098         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1099         vc->vc_need_wrap = 0;
1100 }
1101
1102 static void csi_K(struct vc_data *vc, int vpar)
1103 {
1104         unsigned int count;
1105         unsigned short * start;
1106
1107         switch (vpar) {
1108                 case 0: /* erase from cursor to end of line */
1109                         count = vc->vc_cols - vc->vc_x;
1110                         start = (unsigned short *)vc->vc_pos;
1111                         if (DO_UPDATE(vc))
1112                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1113                                                      vc->vc_cols - vc->vc_x);
1114                         break;
1115                 case 1: /* erase from start of line to cursor */
1116                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1117                         count = vc->vc_x + 1;
1118                         if (DO_UPDATE(vc))
1119                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1120                                                      vc->vc_x + 1);
1121                         break;
1122                 case 2: /* erase whole line */
1123                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1124                         count = vc->vc_cols;
1125                         if (DO_UPDATE(vc))
1126                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1127                                               vc->vc_cols);
1128                         break;
1129                 default:
1130                         return;
1131         }
1132         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1133         vc->vc_need_wrap = 0;
1134 }
1135
1136 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1137 {                                         /* not vt100? */
1138         int count;
1139
1140         if (!vpar)
1141                 vpar++;
1142         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1143
1144         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1145         if (DO_UPDATE(vc))
1146                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1147         vc->vc_need_wrap = 0;
1148 }
1149
1150 static void default_attr(struct vc_data *vc)
1151 {
1152         vc->vc_intensity = 1;
1153         vc->vc_italic = 0;
1154         vc->vc_underline = 0;
1155         vc->vc_reverse = 0;
1156         vc->vc_blink = 0;
1157         vc->vc_color = vc->vc_def_color;
1158 }
1159
1160 /* console_sem is held */
1161 static void csi_m(struct vc_data *vc)
1162 {
1163         int i;
1164
1165         for (i = 0; i <= vc->vc_npar; i++)
1166                 switch (vc->vc_par[i]) {
1167                         case 0: /* all attributes off */
1168                                 default_attr(vc);
1169                                 break;
1170                         case 1:
1171                                 vc->vc_intensity = 2;
1172                                 break;
1173                         case 2:
1174                                 vc->vc_intensity = 0;
1175                                 break;
1176                         case 3:
1177                                 vc->vc_italic = 1;
1178                                 break;
1179                         case 4:
1180                                 vc->vc_underline = 1;
1181                                 break;
1182                         case 5:
1183                                 vc->vc_blink = 1;
1184                                 break;
1185                         case 7:
1186                                 vc->vc_reverse = 1;
1187                                 break;
1188                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1189                                   * Select primary font, don't display
1190                                   * control chars if defined, don't set
1191                                   * bit 8 on output.
1192                                   */
1193                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1194                                                 ? vc->vc_G0_charset
1195                                                 : vc->vc_G1_charset, vc);
1196                                 vc->vc_disp_ctrl = 0;
1197                                 vc->vc_toggle_meta = 0;
1198                                 break;
1199                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1200                                   * Select first alternate font, lets
1201                                   * chars < 32 be displayed as ROM chars.
1202                                   */
1203                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1204                                 vc->vc_disp_ctrl = 1;
1205                                 vc->vc_toggle_meta = 0;
1206                                 break;
1207                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1208                                   * Select second alternate font, toggle
1209                                   * high bit before displaying as ROM char.
1210                                   */
1211                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1212                                 vc->vc_disp_ctrl = 1;
1213                                 vc->vc_toggle_meta = 1;
1214                                 break;
1215                         case 21:
1216                         case 22:
1217                                 vc->vc_intensity = 1;
1218                                 break;
1219                         case 23:
1220                                 vc->vc_italic = 0;
1221                                 break;
1222                         case 24:
1223                                 vc->vc_underline = 0;
1224                                 break;
1225                         case 25:
1226                                 vc->vc_blink = 0;
1227                                 break;
1228                         case 27:
1229                                 vc->vc_reverse = 0;
1230                                 break;
1231                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1232                                   * Enables underscore, white foreground
1233                                   * with white underscore (Linux - use
1234                                   * default foreground).
1235                                   */
1236                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1237                                 vc->vc_underline = 1;
1238                                 break;
1239                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1240                                   * Disable underline option.
1241                                   * Reset colour to default? It did this
1242                                   * before...
1243                                   */
1244                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1245                                 vc->vc_underline = 0;
1246                                 break;
1247                         case 49:
1248                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1249                                 break;
1250                         default:
1251                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1252                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1253                                                 | (vc->vc_color & 0xf0);
1254                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1255                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1256                                                 | (vc->vc_color & 0x0f);
1257                                 break;
1258                 }
1259         update_attr(vc);
1260 }
1261
1262 static void respond_string(const char *p, struct tty_struct *tty)
1263 {
1264         while (*p) {
1265                 tty_insert_flip_char(tty, *p, 0);
1266                 p++;
1267         }
1268         con_schedule_flip(tty);
1269 }
1270
1271 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1272 {
1273         char buf[40];
1274
1275         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1276         respond_string(buf, tty);
1277 }
1278
1279 static inline void status_report(struct tty_struct *tty)
1280 {
1281         respond_string("\033[0n", tty); /* Terminal ok */
1282 }
1283
1284 static inline void respond_ID(struct tty_struct * tty)
1285 {
1286         respond_string(VT102ID, tty);
1287 }
1288
1289 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1290 {
1291         char buf[8];
1292
1293         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1294                 (char)('!' + mry));
1295         respond_string(buf, tty);
1296 }
1297
1298 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1299 int mouse_reporting(void)
1300 {
1301         return vc_cons[fg_console].d->vc_report_mouse;
1302 }
1303
1304 /* console_sem is held */
1305 static void set_mode(struct vc_data *vc, int on_off)
1306 {
1307         int i;
1308
1309         for (i = 0; i <= vc->vc_npar; i++)
1310                 if (vc->vc_ques) {
1311                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1312                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1313                                 if (on_off)
1314                                         set_kbd(vc, decckm);
1315                                 else
1316                                         clr_kbd(vc, decckm);
1317                                 break;
1318                         case 3: /* 80/132 mode switch unimplemented */
1319                                 vc->vc_deccolm = on_off;
1320 #if 0
1321                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1322                                 /* this alone does not suffice; some user mode
1323                                    utility has to change the hardware regs */
1324 #endif
1325                                 break;
1326                         case 5:                 /* Inverted screen on/off */
1327                                 if (vc->vc_decscnm != on_off) {
1328                                         vc->vc_decscnm = on_off;
1329                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1330                                         update_attr(vc);
1331                                 }
1332                                 break;
1333                         case 6:                 /* Origin relative/absolute */
1334                                 vc->vc_decom = on_off;
1335                                 gotoxay(vc, 0, 0);
1336                                 break;
1337                         case 7:                 /* Autowrap on/off */
1338                                 vc->vc_decawm = on_off;
1339                                 break;
1340                         case 8:                 /* Autorepeat on/off */
1341                                 if (on_off)
1342                                         set_kbd(vc, decarm);
1343                                 else
1344                                         clr_kbd(vc, decarm);
1345                                 break;
1346                         case 9:
1347                                 vc->vc_report_mouse = on_off ? 1 : 0;
1348                                 break;
1349                         case 25:                /* Cursor on/off */
1350                                 vc->vc_deccm = on_off;
1351                                 break;
1352                         case 1000:
1353                                 vc->vc_report_mouse = on_off ? 2 : 0;
1354                                 break;
1355                         }
1356                 } else {
1357                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1358                         case 3:                 /* Monitor (display ctrls) */
1359                                 vc->vc_disp_ctrl = on_off;
1360                                 break;
1361                         case 4:                 /* Insert Mode on/off */
1362                                 vc->vc_decim = on_off;
1363                                 break;
1364                         case 20:                /* Lf, Enter == CrLf/Lf */
1365                                 if (on_off)
1366                                         set_kbd(vc, lnm);
1367                                 else
1368                                         clr_kbd(vc, lnm);
1369                                 break;
1370                         }
1371                 }
1372 }
1373
1374 /* console_sem is held */
1375 static void setterm_command(struct vc_data *vc)
1376 {
1377         switch(vc->vc_par[0]) {
1378                 case 1: /* set color for underline mode */
1379                         if (vc->vc_can_do_color &&
1380                                         vc->vc_par[1] < 16) {
1381                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1382                                 if (vc->vc_underline)
1383                                         update_attr(vc);
1384                         }
1385                         break;
1386                 case 2: /* set color for half intensity mode */
1387                         if (vc->vc_can_do_color &&
1388                                         vc->vc_par[1] < 16) {
1389                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1390                                 if (vc->vc_intensity == 0)
1391                                         update_attr(vc);
1392                         }
1393                         break;
1394                 case 8: /* store colors as defaults */
1395                         vc->vc_def_color = vc->vc_attr;
1396                         if (vc->vc_hi_font_mask == 0x100)
1397                                 vc->vc_def_color >>= 1;
1398                         default_attr(vc);
1399                         update_attr(vc);
1400                         break;
1401                 case 9: /* set blanking interval */
1402                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1403                         poke_blanked_console();
1404                         break;
1405                 case 10: /* set bell frequency in Hz */
1406                         if (vc->vc_npar >= 1)
1407                                 vc->vc_bell_pitch = vc->vc_par[1];
1408                         else
1409                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1410                         break;
1411                 case 11: /* set bell duration in msec */
1412                         if (vc->vc_npar >= 1)
1413                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1414                                         vc->vc_par[1] * HZ / 1000 : 0;
1415                         else
1416                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1417                         break;
1418                 case 12: /* bring specified console to the front */
1419                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1420                                 set_console(vc->vc_par[1] - 1);
1421                         break;
1422                 case 13: /* unblank the screen */
1423                         poke_blanked_console();
1424                         break;
1425                 case 14: /* set vesa powerdown interval */
1426                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1427                         break;
1428                 case 15: /* activate the previous console */
1429                         set_console(last_console);
1430                         break;
1431         }
1432 }
1433
1434 /* console_sem is held */
1435 static void csi_at(struct vc_data *vc, unsigned int nr)
1436 {
1437         if (nr > vc->vc_cols - vc->vc_x)
1438                 nr = vc->vc_cols - vc->vc_x;
1439         else if (!nr)
1440                 nr = 1;
1441         insert_char(vc, nr);
1442 }
1443
1444 /* console_sem is held */
1445 static void csi_L(struct vc_data *vc, unsigned int nr)
1446 {
1447         if (nr > vc->vc_rows - vc->vc_y)
1448                 nr = vc->vc_rows - vc->vc_y;
1449         else if (!nr)
1450                 nr = 1;
1451         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1452         vc->vc_need_wrap = 0;
1453 }
1454
1455 /* console_sem is held */
1456 static void csi_P(struct vc_data *vc, unsigned int nr)
1457 {
1458         if (nr > vc->vc_cols - vc->vc_x)
1459                 nr = vc->vc_cols - vc->vc_x;
1460         else if (!nr)
1461                 nr = 1;
1462         delete_char(vc, nr);
1463 }
1464
1465 /* console_sem is held */
1466 static void csi_M(struct vc_data *vc, unsigned int nr)
1467 {
1468         if (nr > vc->vc_rows - vc->vc_y)
1469                 nr = vc->vc_rows - vc->vc_y;
1470         else if (!nr)
1471                 nr=1;
1472         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1473         vc->vc_need_wrap = 0;
1474 }
1475
1476 /* console_sem is held (except via vc_init->reset_terminal */
1477 static void save_cur(struct vc_data *vc)
1478 {
1479         vc->vc_saved_x          = vc->vc_x;
1480         vc->vc_saved_y          = vc->vc_y;
1481         vc->vc_s_intensity      = vc->vc_intensity;
1482         vc->vc_s_italic         = vc->vc_italic;
1483         vc->vc_s_underline      = vc->vc_underline;
1484         vc->vc_s_blink          = vc->vc_blink;
1485         vc->vc_s_reverse        = vc->vc_reverse;
1486         vc->vc_s_charset        = vc->vc_charset;
1487         vc->vc_s_color          = vc->vc_color;
1488         vc->vc_saved_G0         = vc->vc_G0_charset;
1489         vc->vc_saved_G1         = vc->vc_G1_charset;
1490 }
1491
1492 /* console_sem is held */
1493 static void restore_cur(struct vc_data *vc)
1494 {
1495         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1496         vc->vc_intensity        = vc->vc_s_intensity;
1497         vc->vc_italic           = vc->vc_s_italic;
1498         vc->vc_underline        = vc->vc_s_underline;
1499         vc->vc_blink            = vc->vc_s_blink;
1500         vc->vc_reverse          = vc->vc_s_reverse;
1501         vc->vc_charset          = vc->vc_s_charset;
1502         vc->vc_color            = vc->vc_s_color;
1503         vc->vc_G0_charset       = vc->vc_saved_G0;
1504         vc->vc_G1_charset       = vc->vc_saved_G1;
1505         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1506         update_attr(vc);
1507         vc->vc_need_wrap = 0;
1508 }
1509
1510 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1511         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1512         ESpalette };
1513
1514 /* console_sem is held (except via vc_init()) */
1515 static void reset_terminal(struct vc_data *vc, int do_clear)
1516 {
1517         vc->vc_top              = 0;
1518         vc->vc_bottom           = vc->vc_rows;
1519         vc->vc_state            = ESnormal;
1520         vc->vc_ques             = 0;
1521         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1522         vc->vc_G0_charset       = LAT1_MAP;
1523         vc->vc_G1_charset       = GRAF_MAP;
1524         vc->vc_charset          = 0;
1525         vc->vc_need_wrap        = 0;
1526         vc->vc_report_mouse     = 0;
1527         vc->vc_utf              = default_utf8;
1528         vc->vc_utf_count        = 0;
1529
1530         vc->vc_disp_ctrl        = 0;
1531         vc->vc_toggle_meta      = 0;
1532
1533         vc->vc_decscnm          = 0;
1534         vc->vc_decom            = 0;
1535         vc->vc_decawm           = 1;
1536         vc->vc_deccm            = 1;
1537         vc->vc_decim            = 0;
1538
1539         set_kbd(vc, decarm);
1540         clr_kbd(vc, decckm);
1541         clr_kbd(vc, kbdapplic);
1542         clr_kbd(vc, lnm);
1543         kbd_table[vc->vc_num].lockstate = 0;
1544         kbd_table[vc->vc_num].slockstate = 0;
1545         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1546         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1547         /* do not do set_leds here because this causes an endless tasklet loop
1548            when the keyboard hasn't been initialized yet */
1549
1550         vc->vc_cursor_type = CUR_DEFAULT;
1551         vc->vc_complement_mask = vc->vc_s_complement_mask;
1552
1553         default_attr(vc);
1554         update_attr(vc);
1555
1556         vc->vc_tab_stop[0]      = 0x01010100;
1557         vc->vc_tab_stop[1]      =
1558         vc->vc_tab_stop[2]      =
1559         vc->vc_tab_stop[3]      =
1560         vc->vc_tab_stop[4]      = 0x01010101;
1561
1562         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1563         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1564
1565         gotoxy(vc, 0, 0);
1566         save_cur(vc);
1567         if (do_clear)
1568             csi_J(vc, 2);
1569 }
1570
1571 /* console_sem is held */
1572 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1573 {
1574         /*
1575          *  Control characters can be used in the _middle_
1576          *  of an escape sequence.
1577          */
1578         switch (c) {
1579         case 0:
1580                 return;
1581         case 7:
1582                 if (vc->vc_bell_duration)
1583                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1584                 return;
1585         case 8:
1586                 bs(vc);
1587                 return;
1588         case 9:
1589                 vc->vc_pos -= (vc->vc_x << 1);
1590                 while (vc->vc_x < vc->vc_cols - 1) {
1591                         vc->vc_x++;
1592                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1593                                 break;
1594                 }
1595                 vc->vc_pos += (vc->vc_x << 1);
1596                 return;
1597         case 10: case 11: case 12:
1598                 lf(vc);
1599                 if (!is_kbd(vc, lnm))
1600                         return;
1601         case 13:
1602                 cr(vc);
1603                 return;
1604         case 14:
1605                 vc->vc_charset = 1;
1606                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1607                 vc->vc_disp_ctrl = 1;
1608                 return;
1609         case 15:
1610                 vc->vc_charset = 0;
1611                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1612                 vc->vc_disp_ctrl = 0;
1613                 return;
1614         case 24: case 26:
1615                 vc->vc_state = ESnormal;
1616                 return;
1617         case 27:
1618                 vc->vc_state = ESesc;
1619                 return;
1620         case 127:
1621                 del(vc);
1622                 return;
1623         case 128+27:
1624                 vc->vc_state = ESsquare;
1625                 return;
1626         }
1627         switch(vc->vc_state) {
1628         case ESesc:
1629                 vc->vc_state = ESnormal;
1630                 switch (c) {
1631                 case '[':
1632                         vc->vc_state = ESsquare;
1633                         return;
1634                 case ']':
1635                         vc->vc_state = ESnonstd;
1636                         return;
1637                 case '%':
1638                         vc->vc_state = ESpercent;
1639                         return;
1640                 case 'E':
1641                         cr(vc);
1642                         lf(vc);
1643                         return;
1644                 case 'M':
1645                         ri(vc);
1646                         return;
1647                 case 'D':
1648                         lf(vc);
1649                         return;
1650                 case 'H':
1651                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1652                         return;
1653                 case 'Z':
1654                         respond_ID(tty);
1655                         return;
1656                 case '7':
1657                         save_cur(vc);
1658                         return;
1659                 case '8':
1660                         restore_cur(vc);
1661                         return;
1662                 case '(':
1663                         vc->vc_state = ESsetG0;
1664                         return;
1665                 case ')':
1666                         vc->vc_state = ESsetG1;
1667                         return;
1668                 case '#':
1669                         vc->vc_state = EShash;
1670                         return;
1671                 case 'c':
1672                         reset_terminal(vc, 1);
1673                         return;
1674                 case '>':  /* Numeric keypad */
1675                         clr_kbd(vc, kbdapplic);
1676                         return;
1677                 case '=':  /* Appl. keypad */
1678                         set_kbd(vc, kbdapplic);
1679                         return;
1680                 }
1681                 return;
1682         case ESnonstd:
1683                 if (c=='P') {   /* palette escape sequence */
1684                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1685                                 vc->vc_par[vc->vc_npar] = 0;
1686                         vc->vc_npar = 0;
1687                         vc->vc_state = ESpalette;
1688                         return;
1689                 } else if (c=='R') {   /* reset palette */
1690                         reset_palette(vc);
1691                         vc->vc_state = ESnormal;
1692                 } else
1693                         vc->vc_state = ESnormal;
1694                 return;
1695         case ESpalette:
1696                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1697                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1698                         if (vc->vc_npar == 7) {
1699                                 int i = vc->vc_par[0] * 3, j = 1;
1700                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1701                                 vc->vc_palette[i++] += vc->vc_par[j++];
1702                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1703                                 vc->vc_palette[i++] += vc->vc_par[j++];
1704                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1705                                 vc->vc_palette[i] += vc->vc_par[j];
1706                                 set_palette(vc);
1707                                 vc->vc_state = ESnormal;
1708                         }
1709                 } else
1710                         vc->vc_state = ESnormal;
1711                 return;
1712         case ESsquare:
1713                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1714                         vc->vc_par[vc->vc_npar] = 0;
1715                 vc->vc_npar = 0;
1716                 vc->vc_state = ESgetpars;
1717                 if (c == '[') { /* Function key */
1718                         vc->vc_state=ESfunckey;
1719                         return;
1720                 }
1721                 vc->vc_ques = (c == '?');
1722                 if (vc->vc_ques)
1723                         return;
1724         case ESgetpars:
1725                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1726                         vc->vc_npar++;
1727                         return;
1728                 } else if (c>='0' && c<='9') {
1729                         vc->vc_par[vc->vc_npar] *= 10;
1730                         vc->vc_par[vc->vc_npar] += c - '0';
1731                         return;
1732                 } else
1733                         vc->vc_state = ESgotpars;
1734         case ESgotpars:
1735                 vc->vc_state = ESnormal;
1736                 switch(c) {
1737                 case 'h':
1738                         set_mode(vc, 1);
1739                         return;
1740                 case 'l':
1741                         set_mode(vc, 0);
1742                         return;
1743                 case 'c':
1744                         if (vc->vc_ques) {
1745                                 if (vc->vc_par[0])
1746                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1747                                 else
1748                                         vc->vc_cursor_type = CUR_DEFAULT;
1749                                 return;
1750                         }
1751                         break;
1752                 case 'm':
1753                         if (vc->vc_ques) {
1754                                 clear_selection();
1755                                 if (vc->vc_par[0])
1756                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1757                                 else
1758                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1759                                 return;
1760                         }
1761                         break;
1762                 case 'n':
1763                         if (!vc->vc_ques) {
1764                                 if (vc->vc_par[0] == 5)
1765                                         status_report(tty);
1766                                 else if (vc->vc_par[0] == 6)
1767                                         cursor_report(vc, tty);
1768                         }
1769                         return;
1770                 }
1771                 if (vc->vc_ques) {
1772                         vc->vc_ques = 0;
1773                         return;
1774                 }
1775                 switch(c) {
1776                 case 'G': case '`':
1777                         if (vc->vc_par[0])
1778                                 vc->vc_par[0]--;
1779                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1780                         return;
1781                 case 'A':
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 'B': case 'e':
1787                         if (!vc->vc_par[0])
1788                                 vc->vc_par[0]++;
1789                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1790                         return;
1791                 case 'C': case 'a':
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 'D':
1797                         if (!vc->vc_par[0])
1798                                 vc->vc_par[0]++;
1799                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1800                         return;
1801                 case 'E':
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 'F':
1807                         if (!vc->vc_par[0])
1808                                 vc->vc_par[0]++;
1809                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1810                         return;
1811                 case 'd':
1812                         if (vc->vc_par[0])
1813                                 vc->vc_par[0]--;
1814                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1815                         return;
1816                 case 'H': case 'f':
1817                         if (vc->vc_par[0])
1818                                 vc->vc_par[0]--;
1819                         if (vc->vc_par[1])
1820                                 vc->vc_par[1]--;
1821                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1822                         return;
1823                 case 'J':
1824                         csi_J(vc, vc->vc_par[0]);
1825                         return;
1826                 case 'K':
1827                         csi_K(vc, vc->vc_par[0]);
1828                         return;
1829                 case 'L':
1830                         csi_L(vc, vc->vc_par[0]);
1831                         return;
1832                 case 'M':
1833                         csi_M(vc, vc->vc_par[0]);
1834                         return;
1835                 case 'P':
1836                         csi_P(vc, vc->vc_par[0]);
1837                         return;
1838                 case 'c':
1839                         if (!vc->vc_par[0])
1840                                 respond_ID(tty);
1841                         return;
1842                 case 'g':
1843                         if (!vc->vc_par[0])
1844                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1845                         else if (vc->vc_par[0] == 3) {
1846                                 vc->vc_tab_stop[0] =
1847                                         vc->vc_tab_stop[1] =
1848                                         vc->vc_tab_stop[2] =
1849                                         vc->vc_tab_stop[3] =
1850                                         vc->vc_tab_stop[4] = 0;
1851                         }
1852                         return;
1853                 case 'm':
1854                         csi_m(vc);
1855                         return;
1856                 case 'q': /* DECLL - but only 3 leds */
1857                         /* map 0,1,2,3 to 0,1,2,4 */
1858                         if (vc->vc_par[0] < 4)
1859                                 setledstate(kbd_table + vc->vc_num,
1860                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1861                         return;
1862                 case 'r':
1863                         if (!vc->vc_par[0])
1864                                 vc->vc_par[0]++;
1865                         if (!vc->vc_par[1])
1866                                 vc->vc_par[1] = vc->vc_rows;
1867                         /* Minimum allowed region is 2 lines */
1868                         if (vc->vc_par[0] < vc->vc_par[1] &&
1869                             vc->vc_par[1] <= vc->vc_rows) {
1870                                 vc->vc_top = vc->vc_par[0] - 1;
1871                                 vc->vc_bottom = vc->vc_par[1];
1872                                 gotoxay(vc, 0, 0);
1873                         }
1874                         return;
1875                 case 's':
1876                         save_cur(vc);
1877                         return;
1878                 case 'u':
1879                         restore_cur(vc);
1880                         return;
1881                 case 'X':
1882                         csi_X(vc, vc->vc_par[0]);
1883                         return;
1884                 case '@':
1885                         csi_at(vc, vc->vc_par[0]);
1886                         return;
1887                 case ']': /* setterm functions */
1888                         setterm_command(vc);
1889                         return;
1890                 }
1891                 return;
1892         case ESpercent:
1893                 vc->vc_state = ESnormal;
1894                 switch (c) {
1895                 case '@':  /* defined in ISO 2022 */
1896                         vc->vc_utf = 0;
1897                         return;
1898                 case 'G':  /* prelim official escape code */
1899                 case '8':  /* retained for compatibility */
1900                         vc->vc_utf = 1;
1901                         return;
1902                 }
1903                 return;
1904         case ESfunckey:
1905                 vc->vc_state = ESnormal;
1906                 return;
1907         case EShash:
1908                 vc->vc_state = ESnormal;
1909                 if (c == '8') {
1910                         /* DEC screen alignment test. kludge :-) */
1911                         vc->vc_video_erase_char =
1912                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1913                         csi_J(vc, 2);
1914                         vc->vc_video_erase_char =
1915                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1916                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1917                 }
1918                 return;
1919         case ESsetG0:
1920                 if (c == '0')
1921                         vc->vc_G0_charset = GRAF_MAP;
1922                 else if (c == 'B')
1923                         vc->vc_G0_charset = LAT1_MAP;
1924                 else if (c == 'U')
1925                         vc->vc_G0_charset = IBMPC_MAP;
1926                 else if (c == 'K')
1927                         vc->vc_G0_charset = USER_MAP;
1928                 if (vc->vc_charset == 0)
1929                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1930                 vc->vc_state = ESnormal;
1931                 return;
1932         case ESsetG1:
1933                 if (c == '0')
1934                         vc->vc_G1_charset = GRAF_MAP;
1935                 else if (c == 'B')
1936                         vc->vc_G1_charset = LAT1_MAP;
1937                 else if (c == 'U')
1938                         vc->vc_G1_charset = IBMPC_MAP;
1939                 else if (c == 'K')
1940                         vc->vc_G1_charset = USER_MAP;
1941                 if (vc->vc_charset == 1)
1942                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1943                 vc->vc_state = ESnormal;
1944                 return;
1945         default:
1946                 vc->vc_state = ESnormal;
1947         }
1948 }
1949
1950 /* This is a temporary buffer used to prepare a tty console write
1951  * so that we can easily avoid touching user space while holding the
1952  * console spinlock.  It is allocated in con_init and is shared by
1953  * this code and the vc_screen read/write tty calls.
1954  *
1955  * We have to allocate this statically in the kernel data section
1956  * since console_init (and thus con_init) are called before any
1957  * kernel memory allocation is available.
1958  */
1959 char con_buf[CON_BUF_SIZE];
1960 DEFINE_MUTEX(con_buf_mtx);
1961
1962 /* is_double_width() is based on the wcwidth() implementation by
1963  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
1964  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
1965  */
1966 struct interval {
1967         uint32_t first;
1968         uint32_t last;
1969 };
1970
1971 static int bisearch(uint32_t ucs, const struct interval *table, int max)
1972 {
1973         int min = 0;
1974         int mid;
1975
1976         if (ucs < table[0].first || ucs > table[max].last)
1977                 return 0;
1978         while (max >= min) {
1979                 mid = (min + max) / 2;
1980                 if (ucs > table[mid].last)
1981                         min = mid + 1;
1982                 else if (ucs < table[mid].first)
1983                         max = mid - 1;
1984                 else
1985                         return 1;
1986         }
1987         return 0;
1988 }
1989
1990 static int is_double_width(uint32_t ucs)
1991 {
1992         static const struct interval double_width[] = {
1993                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
1994                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1995                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
1996                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
1997         };
1998         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
1999 }
2000
2001 /* acquires console_sem */
2002 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2003 {
2004 #ifdef VT_BUF_VRAM_ONLY
2005 #define FLUSH do { } while(0);
2006 #else
2007 #define FLUSH if (draw_x >= 0) { \
2008         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2009         draw_x = -1; \
2010         }
2011 #endif
2012
2013         int c, tc, ok, n = 0, draw_x = -1;
2014         unsigned int currcons;
2015         unsigned long draw_from = 0, draw_to = 0;
2016         struct vc_data *vc;
2017         unsigned char vc_attr;
2018         uint8_t rescan;
2019         uint8_t inverse;
2020         uint8_t width;
2021         u16 himask, charmask;
2022         const unsigned char *orig_buf = NULL;
2023         int orig_count;
2024
2025         if (in_interrupt())
2026                 return count;
2027
2028         might_sleep();
2029
2030         acquire_console_sem();
2031         vc = tty->driver_data;
2032         if (vc == NULL) {
2033                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2034                 release_console_sem();
2035                 return 0;
2036         }
2037
2038         currcons = vc->vc_num;
2039         if (!vc_cons_allocated(currcons)) {
2040             /* could this happen? */
2041             static int error = 0;
2042             if (!error) {
2043                 error = 1;
2044                 printk("con_write: tty %d not allocated\n", currcons+1);
2045             }
2046             release_console_sem();
2047             return 0;
2048         }
2049         release_console_sem();
2050
2051         orig_buf = buf;
2052         orig_count = count;
2053
2054         /* At this point 'buf' is guaranteed to be a kernel buffer
2055          * and therefore no access to userspace (and therefore sleeping)
2056          * will be needed.  The con_buf_mtx serializes all tty based
2057          * console rendering and vcs write/read operations.  We hold
2058          * the console spinlock during the entire write.
2059          */
2060
2061         acquire_console_sem();
2062
2063         vc = tty->driver_data;
2064         if (vc == NULL) {
2065                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2066                 release_console_sem();
2067                 goto out;
2068         }
2069
2070         himask = vc->vc_hi_font_mask;
2071         charmask = himask ? 0x1ff : 0xff;
2072
2073         /* undraw cursor first */
2074         if (IS_FG(vc))
2075                 hide_cursor(vc);
2076
2077         while (!tty->stopped && count) {
2078                 int orig = *buf;
2079                 c = orig;
2080                 buf++;
2081                 n++;
2082                 count--;
2083                 rescan = 0;
2084                 inverse = 0;
2085                 width = 1;
2086
2087                 /* Do no translation at all in control states */
2088                 if (vc->vc_state != ESnormal) {
2089                         tc = c;
2090                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2091                     /* Combine UTF-8 into Unicode in vc_utf_char.
2092                      * vc_utf_count is the number of continuation bytes still
2093                      * expected to arrive.
2094                      * vc_npar is the number of continuation bytes arrived so
2095                      * far
2096                      */
2097 rescan_last_byte:
2098                     if ((c & 0xc0) == 0x80) {
2099                         /* Continuation byte received */
2100                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2101                         if (vc->vc_utf_count) {
2102                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2103                             vc->vc_npar++;
2104                             if (--vc->vc_utf_count) {
2105                                 /* Still need some bytes */
2106                                 continue;
2107                             }
2108                             /* Got a whole character */
2109                             c = vc->vc_utf_char;
2110                             /* Reject overlong sequences */
2111                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2112                                         c > utf8_length_changes[vc->vc_npar])
2113                                 c = 0xfffd;
2114                         } else {
2115                             /* Unexpected continuation byte */
2116                             vc->vc_utf_count = 0;
2117                             c = 0xfffd;
2118                         }
2119                     } else {
2120                         /* Single ASCII byte or first byte of a sequence received */
2121                         if (vc->vc_utf_count) {
2122                             /* Continuation byte expected */
2123                             rescan = 1;
2124                             vc->vc_utf_count = 0;
2125                             c = 0xfffd;
2126                         } else if (c > 0x7f) {
2127                             /* First byte of a multibyte sequence received */
2128                             vc->vc_npar = 0;
2129                             if ((c & 0xe0) == 0xc0) {
2130                                 vc->vc_utf_count = 1;
2131                                 vc->vc_utf_char = (c & 0x1f);
2132                             } else if ((c & 0xf0) == 0xe0) {
2133                                 vc->vc_utf_count = 2;
2134                                 vc->vc_utf_char = (c & 0x0f);
2135                             } else if ((c & 0xf8) == 0xf0) {
2136                                 vc->vc_utf_count = 3;
2137                                 vc->vc_utf_char = (c & 0x07);
2138                             } else if ((c & 0xfc) == 0xf8) {
2139                                 vc->vc_utf_count = 4;
2140                                 vc->vc_utf_char = (c & 0x03);
2141                             } else if ((c & 0xfe) == 0xfc) {
2142                                 vc->vc_utf_count = 5;
2143                                 vc->vc_utf_char = (c & 0x01);
2144                             } else {
2145                                 /* 254 and 255 are invalid */
2146                                 c = 0xfffd;
2147                             }
2148                             if (vc->vc_utf_count) {
2149                                 /* Still need some bytes */
2150                                 continue;
2151                             }
2152                         }
2153                         /* Nothing to do if an ASCII byte was received */
2154                     }
2155                     /* End of UTF-8 decoding. */
2156                     /* c is the received character, or U+FFFD for invalid sequences. */
2157                     /* Replace invalid Unicode code points with U+FFFD too */
2158                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2159                         c = 0xfffd;
2160                     tc = c;
2161                 } else {        /* no utf or alternate charset mode */
2162                     tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2163                 }
2164
2165                 /* If the original code was a control character we
2166                  * only allow a glyph to be displayed if the code is
2167                  * not normally used (such as for cursor movement) or
2168                  * if the disp_ctrl mode has been explicitly enabled.
2169                  * Certain characters (as given by the CTRL_ALWAYS
2170                  * bitmap) are always displayed as control characters,
2171                  * as the console would be pretty useless without
2172                  * them; to display an arbitrary font position use the
2173                  * direct-to-font zone in UTF-8 mode.
2174                  */
2175                 ok = tc && (c >= 32 ||
2176                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2177                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2178                         && (c != 127 || vc->vc_disp_ctrl)
2179                         && (c != 128+27);
2180
2181                 if (vc->vc_state == ESnormal && ok) {
2182                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2183                                 if (is_double_width(c))
2184                                         width = 2;
2185                         }
2186                         /* Now try to find out how to display it */
2187                         tc = conv_uni_to_pc(vc, tc);
2188                         if (tc & ~charmask) {
2189                                 if (tc == -1 || tc == -2) {
2190                                     continue; /* nothing to display */
2191                                 }
2192                                 /* Glyph not found */
2193                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2194                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2195                                        This would make absolutely no sense with Unicode in mind,
2196                                        but do this for ASCII characters since a font may lack
2197                                        Unicode mapping info and we don't want to end up with
2198                                        having question marks only. */
2199                                     tc = c;
2200                                 } else {
2201                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2202                                     tc = conv_uni_to_pc(vc, 0xfffd);
2203                                     if (tc < 0) {
2204                                         inverse = 1;
2205                                         tc = conv_uni_to_pc(vc, '?');
2206                                         if (tc < 0) tc = '?';
2207                                     }
2208                                 }
2209                         }
2210
2211                         if (!inverse) {
2212                                 vc_attr = vc->vc_attr;
2213                         } else {
2214                                 /* invert vc_attr */
2215                                 if (!vc->vc_can_do_color) {
2216                                         vc_attr = (vc->vc_attr) ^ 0x08;
2217                                 } else if (vc->vc_hi_font_mask == 0x100) {
2218                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2219                                 } else {
2220                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2221                                 }
2222                                 FLUSH
2223                         }
2224
2225                         while (1) {
2226                                 if (vc->vc_need_wrap || vc->vc_decim)
2227                                         FLUSH
2228                                 if (vc->vc_need_wrap) {
2229                                         cr(vc);
2230                                         lf(vc);
2231                                 }
2232                                 if (vc->vc_decim)
2233                                         insert_char(vc, 1);
2234                                 scr_writew(himask ?
2235                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2236                                              (vc_attr << 8) + tc,
2237                                            (u16 *) vc->vc_pos);
2238                                 if (DO_UPDATE(vc) && draw_x < 0) {
2239                                         draw_x = vc->vc_x;
2240                                         draw_from = vc->vc_pos;
2241                                 }
2242                                 if (vc->vc_x == vc->vc_cols - 1) {
2243                                         vc->vc_need_wrap = vc->vc_decawm;
2244                                         draw_to = vc->vc_pos + 2;
2245                                 } else {
2246                                         vc->vc_x++;
2247                                         draw_to = (vc->vc_pos += 2);
2248                                 }
2249
2250                                 if (!--width) break;
2251
2252                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2253                                 if (tc < 0) tc = ' ';
2254                         }
2255
2256                         if (inverse) {
2257                                 FLUSH
2258                         }
2259
2260                         if (rescan) {
2261                                 rescan = 0;
2262                                 inverse = 0;
2263                                 width = 1;
2264                                 c = orig;
2265                                 goto rescan_last_byte;
2266                         }
2267                         continue;
2268                 }
2269                 FLUSH
2270                 do_con_trol(tty, vc, orig);
2271         }
2272         FLUSH
2273         console_conditional_schedule();
2274         release_console_sem();
2275
2276 out:
2277         return n;
2278 #undef FLUSH
2279 }
2280
2281 /*
2282  * This is the console switching callback.
2283  *
2284  * Doing console switching in a process context allows
2285  * us to do the switches asynchronously (needed when we want
2286  * to switch due to a keyboard interrupt).  Synchronization
2287  * with other console code and prevention of re-entrancy is
2288  * ensured with console_sem.
2289  */
2290 static void console_callback(struct work_struct *ignored)
2291 {
2292         acquire_console_sem();
2293
2294         if (want_console >= 0) {
2295                 if (want_console != fg_console &&
2296                     vc_cons_allocated(want_console)) {
2297                         hide_cursor(vc_cons[fg_console].d);
2298                         change_console(vc_cons[want_console].d);
2299                         /* we only changed when the console had already
2300                            been allocated - a new console is not created
2301                            in an interrupt routine */
2302                 }
2303                 want_console = -1;
2304         }
2305         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2306                 do_poke_blanked_console = 0;
2307                 poke_blanked_console();
2308         }
2309         if (scrollback_delta) {
2310                 struct vc_data *vc = vc_cons[fg_console].d;
2311                 clear_selection();
2312                 if (vc->vc_mode == KD_TEXT)
2313                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2314                 scrollback_delta = 0;
2315         }
2316         if (blank_timer_expired) {
2317                 do_blank_screen(0);
2318                 blank_timer_expired = 0;
2319         }
2320
2321         release_console_sem();
2322 }
2323
2324 int set_console(int nr)
2325 {
2326         struct vc_data *vc = vc_cons[fg_console].d;
2327
2328         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2329                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2330
2331                 /*
2332                  * Console switch will fail in console_callback() or
2333                  * change_console() so there is no point scheduling
2334                  * the callback
2335                  *
2336                  * Existing set_console() users don't check the return
2337                  * value so this shouldn't break anything
2338                  */
2339                 return -EINVAL;
2340         }
2341
2342         want_console = nr;
2343         schedule_console_callback();
2344
2345         return 0;
2346 }
2347
2348 struct tty_driver *console_driver;
2349
2350 #ifdef CONFIG_VT_CONSOLE
2351
2352 /*
2353  *      Console on virtual terminal
2354  *
2355  * The console must be locked when we get here.
2356  */
2357
2358 static void vt_console_print(struct console *co, const char *b, unsigned count)
2359 {
2360         struct vc_data *vc = vc_cons[fg_console].d;
2361         unsigned char c;
2362         static unsigned long printing;
2363         const ushort *start;
2364         ushort cnt = 0;
2365         ushort myx;
2366
2367         /* console busy or not yet initialized */
2368         if (!printable || test_and_set_bit(0, &printing))
2369                 return;
2370
2371         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2372                 vc = vc_cons[kmsg_redirect - 1].d;
2373
2374         /* read `x' only after setting currcons properly (otherwise
2375            the `x' macro will read the x of the foreground console). */
2376         myx = vc->vc_x;
2377
2378         if (!vc_cons_allocated(fg_console)) {
2379                 /* impossible */
2380                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2381                 goto quit;
2382         }
2383
2384         if (vc->vc_mode != KD_TEXT)
2385                 goto quit;
2386
2387         /* undraw cursor first */
2388         if (IS_FG(vc))
2389                 hide_cursor(vc);
2390
2391         start = (ushort *)vc->vc_pos;
2392
2393         /* Contrived structure to try to emulate original need_wrap behaviour
2394          * Problems caused when we have need_wrap set on '\n' character */
2395         while (count--) {
2396                 c = *b++;
2397                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2398                         if (cnt > 0) {
2399                                 if (CON_IS_VISIBLE(vc))
2400                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2401                                 vc->vc_x += cnt;
2402                                 if (vc->vc_need_wrap)
2403                                         vc->vc_x--;
2404                                 cnt = 0;
2405                         }
2406                         if (c == 8) {           /* backspace */
2407                                 bs(vc);
2408                                 start = (ushort *)vc->vc_pos;
2409                                 myx = vc->vc_x;
2410                                 continue;
2411                         }
2412                         if (c != 13)
2413                                 lf(vc);
2414                         cr(vc);
2415                         start = (ushort *)vc->vc_pos;
2416                         myx = vc->vc_x;
2417                         if (c == 10 || c == 13)
2418                                 continue;
2419                 }
2420                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2421                 cnt++;
2422                 if (myx == vc->vc_cols - 1) {
2423                         vc->vc_need_wrap = 1;
2424                         continue;
2425                 }
2426                 vc->vc_pos += 2;
2427                 myx++;
2428         }
2429         if (cnt > 0) {
2430                 if (CON_IS_VISIBLE(vc))
2431                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2432                 vc->vc_x += cnt;
2433                 if (vc->vc_x == vc->vc_cols) {
2434                         vc->vc_x--;
2435                         vc->vc_need_wrap = 1;
2436                 }
2437         }
2438         set_cursor(vc);
2439
2440 quit:
2441         clear_bit(0, &printing);
2442 }
2443
2444 static struct tty_driver *vt_console_device(struct console *c, int *index)
2445 {
2446         *index = c->index ? c->index-1 : fg_console;
2447         return console_driver;
2448 }
2449
2450 static struct console vt_console_driver = {
2451         .name           = "tty",
2452         .write          = vt_console_print,
2453         .device         = vt_console_device,
2454         .unblank        = unblank_screen,
2455         .flags          = CON_PRINTBUFFER,
2456         .index          = -1,
2457 };
2458 #endif
2459
2460 /*
2461  *      Handling of Linux-specific VC ioctls
2462  */
2463
2464 /*
2465  * Generally a bit racy with respect to console_sem().
2466  *
2467  * There are some functions which don't need it.
2468  *
2469  * There are some functions which can sleep for arbitrary periods
2470  * (paste_selection) but we don't need the lock there anyway.
2471  *
2472  * set_selection has locking, and definitely needs it
2473  */
2474
2475 int tioclinux(struct tty_struct *tty, unsigned long arg)
2476 {
2477         char type, data;
2478         char __user *p = (char __user *)arg;
2479         int lines;
2480         int ret;
2481
2482         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2483                 return -EINVAL;
2484         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2485                 return -EPERM;
2486         if (get_user(type, p))
2487                 return -EFAULT;
2488         ret = 0;
2489         switch (type)
2490         {
2491                 case TIOCL_SETSEL:
2492                         acquire_console_sem();
2493                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2494                         release_console_sem();
2495                         break;
2496                 case TIOCL_PASTESEL:
2497                         ret = paste_selection(tty);
2498                         break;
2499                 case TIOCL_UNBLANKSCREEN:
2500                         acquire_console_sem();
2501                         unblank_screen();
2502                         release_console_sem();
2503                         break;
2504                 case TIOCL_SELLOADLUT:
2505                         ret = sel_loadlut(p);
2506                         break;
2507                 case TIOCL_GETSHIFTSTATE:
2508                         
2509         /*
2510          * Make it possible to react to Shift+Mousebutton.
2511          * Note that 'shift_state' is an undocumented
2512          * kernel-internal variable; programs not closely
2513          * related to the kernel should not use this.
2514          */
2515                         data = shift_state;
2516                         ret = __put_user(data, p);
2517                         break;
2518                 case TIOCL_GETMOUSEREPORTING:
2519                         data = mouse_reporting();
2520                         ret = __put_user(data, p);
2521                         break;
2522                 case TIOCL_SETVESABLANK:
2523                         ret = set_vesa_blanking(p);
2524                         break;
2525                 case TIOCL_GETKMSGREDIRECT:
2526                         data = kmsg_redirect;
2527                         ret = __put_user(data, p);
2528                         break;
2529                 case TIOCL_SETKMSGREDIRECT:
2530                         if (!capable(CAP_SYS_ADMIN)) {
2531                                 ret = -EPERM;
2532                         } else {
2533                                 if (get_user(data, p+1))
2534                                         ret = -EFAULT;
2535                                 else
2536                                         kmsg_redirect = data;
2537                         }
2538                         break;
2539                 case TIOCL_GETFGCONSOLE:
2540                         ret = fg_console;
2541                         break;
2542                 case TIOCL_SCROLLCONSOLE:
2543                         if (get_user(lines, (s32 __user *)(p+4))) {
2544                                 ret = -EFAULT;
2545                         } else {
2546                                 scrollfront(vc_cons[fg_console].d, lines);
2547                                 ret = 0;
2548                         }
2549                         break;
2550                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2551                         acquire_console_sem();
2552                         ignore_poke = 1;
2553                         do_blank_screen(0);
2554                         release_console_sem();
2555                         break;
2556                 case TIOCL_BLANKEDSCREEN:
2557                         ret = console_blanked;
2558                         break;
2559                 default:
2560                         ret = -EINVAL;
2561                         break;
2562         }
2563         return ret;
2564 }
2565
2566 /*
2567  * /dev/ttyN handling
2568  */
2569
2570 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2571 {
2572         int     retval;
2573
2574         retval = do_con_write(tty, buf, count);
2575         con_flush_chars(tty);
2576
2577         return retval;
2578 }
2579
2580 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2581 {
2582         if (in_interrupt())
2583                 return; /* n_r3964 calls put_char() from interrupt context */
2584         do_con_write(tty, &ch, 1);
2585 }
2586
2587 static int con_write_room(struct tty_struct *tty)
2588 {
2589         if (tty->stopped)
2590                 return 0;
2591         return 4096;            /* No limit, really; we're not buffering */
2592 }
2593
2594 static int con_chars_in_buffer(struct tty_struct *tty)
2595 {
2596         return 0;               /* we're not buffering */
2597 }
2598
2599 /*
2600  * con_throttle and con_unthrottle are only used for
2601  * paste_selection(), which has to stuff in a large number of
2602  * characters...
2603  */
2604 static void con_throttle(struct tty_struct *tty)
2605 {
2606 }
2607
2608 static void con_unthrottle(struct tty_struct *tty)
2609 {
2610         struct vc_data *vc = tty->driver_data;
2611
2612         wake_up_interruptible(&vc->paste_wait);
2613 }
2614
2615 /*
2616  * Turn the Scroll-Lock LED on when the tty is stopped
2617  */
2618 static void con_stop(struct tty_struct *tty)
2619 {
2620         int console_num;
2621         if (!tty)
2622                 return;
2623         console_num = tty->index;
2624         if (!vc_cons_allocated(console_num))
2625                 return;
2626         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2627         set_leds();
2628 }
2629
2630 /*
2631  * Turn the Scroll-Lock LED off when the console is started
2632  */
2633 static void con_start(struct tty_struct *tty)
2634 {
2635         int console_num;
2636         if (!tty)
2637                 return;
2638         console_num = tty->index;
2639         if (!vc_cons_allocated(console_num))
2640                 return;
2641         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2642         set_leds();
2643 }
2644
2645 static void con_flush_chars(struct tty_struct *tty)
2646 {
2647         struct vc_data *vc;
2648
2649         if (in_interrupt())     /* from flush_to_ldisc */
2650                 return;
2651
2652         /* if we race with con_close(), vt may be null */
2653         acquire_console_sem();
2654         vc = tty->driver_data;
2655         if (vc)
2656                 set_cursor(vc);
2657         release_console_sem();
2658 }
2659
2660 /*
2661  * Allocate the console screen memory.
2662  */
2663 static int con_open(struct tty_struct *tty, struct file *filp)
2664 {
2665         unsigned int currcons = tty->index;
2666         int ret = 0;
2667
2668         acquire_console_sem();
2669         if (tty->driver_data == NULL) {
2670                 ret = vc_allocate(currcons);
2671                 if (ret == 0) {
2672                         struct vc_data *vc = vc_cons[currcons].d;
2673                         tty->driver_data = vc;
2674                         vc->vc_tty = tty;
2675
2676                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2677                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2678                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2679                         }
2680                         release_console_sem();
2681                         vcs_make_sysfs(tty);
2682                         return ret;
2683                 }
2684         }
2685         release_console_sem();
2686         return ret;
2687 }
2688
2689 /*
2690  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2691  * and taking a ref against the tty while we're in the process of forgetting
2692  * about it and cleaning things up.
2693  *
2694  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2695  */
2696 static void con_close(struct tty_struct *tty, struct file *filp)
2697 {
2698         mutex_lock(&tty_mutex);
2699         acquire_console_sem();
2700         if (tty && tty->count == 1) {
2701                 struct vc_data *vc = tty->driver_data;
2702
2703                 if (vc)
2704                         vc->vc_tty = NULL;
2705                 tty->driver_data = NULL;
2706                 release_console_sem();
2707                 vcs_remove_sysfs(tty);
2708                 mutex_unlock(&tty_mutex);
2709                 /*
2710                  * tty_mutex is released, but we still hold BKL, so there is
2711                  * still exclusion against init_dev()
2712                  */
2713                 return;
2714         }
2715         release_console_sem();
2716         mutex_unlock(&tty_mutex);
2717 }
2718
2719 static int default_italic_color    = 2; // green (ASCII)
2720 static int default_underline_color = 3; // cyan (ASCII)
2721 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2722 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2723
2724 static void vc_init(struct vc_data *vc, unsigned int rows,
2725                     unsigned int cols, int do_clear)
2726 {
2727         int j, k ;
2728
2729         vc->vc_cols = cols;
2730         vc->vc_rows = rows;
2731         vc->vc_size_row = cols << 1;
2732         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2733
2734         set_origin(vc);
2735         vc->vc_pos = vc->vc_origin;
2736         reset_vc(vc);
2737         for (j=k=0; j<16; j++) {
2738                 vc->vc_palette[k++] = default_red[j] ;
2739                 vc->vc_palette[k++] = default_grn[j] ;
2740                 vc->vc_palette[k++] = default_blu[j] ;
2741         }
2742         vc->vc_def_color       = 0x07;   /* white */
2743         vc->vc_ulcolor         = default_underline_color;
2744         vc->vc_itcolor         = default_italic_color;
2745         vc->vc_halfcolor       = 0x08;   /* grey */
2746         init_waitqueue_head(&vc->paste_wait);
2747         reset_terminal(vc, do_clear);
2748 }
2749
2750 /*
2751  * This routine initializes console interrupts, and does nothing
2752  * else. If you want the screen to clear, call tty_write with
2753  * the appropriate escape-sequence.
2754  */
2755
2756 static int __init con_init(void)
2757 {
2758         const char *display_desc = NULL;
2759         struct vc_data *vc;
2760         unsigned int currcons = 0, i;
2761
2762         acquire_console_sem();
2763
2764         if (conswitchp)
2765                 display_desc = conswitchp->con_startup();
2766         if (!display_desc) {
2767                 fg_console = 0;
2768                 release_console_sem();
2769                 return 0;
2770         }
2771
2772         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2773                 struct con_driver *con_driver = &registered_con_driver[i];
2774
2775                 if (con_driver->con == NULL) {
2776                         con_driver->con = conswitchp;
2777                         con_driver->desc = display_desc;
2778                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2779                         con_driver->first = 0;
2780                         con_driver->last = MAX_NR_CONSOLES - 1;
2781                         break;
2782                 }
2783         }
2784
2785         for (i = 0; i < MAX_NR_CONSOLES; i++)
2786                 con_driver_map[i] = conswitchp;
2787
2788         if (blankinterval) {
2789                 blank_state = blank_normal_wait;
2790                 mod_timer(&console_timer, jiffies + blankinterval);
2791         }
2792
2793         /*
2794          * kmalloc is not running yet - we use the bootmem allocator.
2795          */
2796         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2797                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2798                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2799                 visual_init(vc, currcons, 1);
2800                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2801                 vc->vc_kmalloced = 0;
2802                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2803                         currcons || !vc->vc_sw->con_save_screen);
2804         }
2805         currcons = fg_console = 0;
2806         master_display_fg = vc = vc_cons[currcons].d;
2807         set_origin(vc);
2808         save_screen(vc);
2809         gotoxy(vc, vc->vc_x, vc->vc_y);
2810         csi_J(vc, 0);
2811         update_screen(vc);
2812         printk("Console: %s %s %dx%d",
2813                 vc->vc_can_do_color ? "colour" : "mono",
2814                 display_desc, vc->vc_cols, vc->vc_rows);
2815         printable = 1;
2816         printk("\n");
2817
2818         release_console_sem();
2819
2820 #ifdef CONFIG_VT_CONSOLE
2821         register_console(&vt_console_driver);
2822 #endif
2823         return 0;
2824 }
2825 console_initcall(con_init);
2826
2827 static const struct tty_operations con_ops = {
2828         .open = con_open,
2829         .close = con_close,
2830         .write = con_write,
2831         .write_room = con_write_room,
2832         .put_char = con_put_char,
2833         .flush_chars = con_flush_chars,
2834         .chars_in_buffer = con_chars_in_buffer,
2835         .ioctl = vt_ioctl,
2836         .stop = con_stop,
2837         .start = con_start,
2838         .throttle = con_throttle,
2839         .unthrottle = con_unthrottle,
2840 };
2841
2842 int __init vty_init(void)
2843 {
2844         vcs_init();
2845
2846         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2847         if (!console_driver)
2848                 panic("Couldn't allocate console driver\n");
2849         console_driver->owner = THIS_MODULE;
2850         console_driver->name = "tty";
2851         console_driver->name_base = 1;
2852         console_driver->major = TTY_MAJOR;
2853         console_driver->minor_start = 1;
2854         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2855         console_driver->init_termios = tty_std_termios;
2856         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2857         tty_set_operations(console_driver, &con_ops);
2858         if (tty_register_driver(console_driver))
2859                 panic("Couldn't register console driver\n");
2860
2861         kbd_init();
2862         console_map_init();
2863 #ifdef CONFIG_PROM_CONSOLE
2864         prom_con_init();
2865 #endif
2866 #ifdef CONFIG_MDA_CONSOLE
2867         mda_console_init();
2868 #endif
2869         return 0;
2870 }
2871
2872 #ifndef VT_SINGLE_DRIVER
2873 #include <linux/device.h>
2874
2875 static struct class *vtconsole_class;
2876
2877 static int bind_con_driver(const struct consw *csw, int first, int last,
2878                            int deflt)
2879 {
2880         struct module *owner = csw->owner;
2881         const char *desc = NULL;
2882         struct con_driver *con_driver;
2883         int i, j = -1, k = -1, retval = -ENODEV;
2884
2885         if (!try_module_get(owner))
2886                 return -ENODEV;
2887
2888         acquire_console_sem();
2889
2890         /* check if driver is registered */
2891         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2892                 con_driver = &registered_con_driver[i];
2893
2894                 if (con_driver->con == csw) {
2895                         desc = con_driver->desc;
2896                         retval = 0;
2897                         break;
2898                 }
2899         }
2900
2901         if (retval)
2902                 goto err;
2903
2904         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2905                 csw->con_startup();
2906                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2907         }
2908
2909         if (deflt) {
2910                 if (conswitchp)
2911                         module_put(conswitchp->owner);
2912
2913                 __module_get(owner);
2914                 conswitchp = csw;
2915         }
2916
2917         first = max(first, con_driver->first);
2918         last = min(last, con_driver->last);
2919
2920         for (i = first; i <= last; i++) {
2921                 int old_was_color;
2922                 struct vc_data *vc = vc_cons[i].d;
2923
2924                 if (con_driver_map[i])
2925                         module_put(con_driver_map[i]->owner);
2926                 __module_get(owner);
2927                 con_driver_map[i] = csw;
2928
2929                 if (!vc || !vc->vc_sw)
2930                         continue;
2931
2932                 j = i;
2933
2934                 if (CON_IS_VISIBLE(vc)) {
2935                         k = i;
2936                         save_screen(vc);
2937                 }
2938
2939                 old_was_color = vc->vc_can_do_color;
2940                 vc->vc_sw->con_deinit(vc);
2941                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2942                 visual_init(vc, i, 0);
2943                 set_origin(vc);
2944                 update_attr(vc);
2945
2946                 /* If the console changed between mono <-> color, then
2947                  * the attributes in the screenbuf will be wrong.  The
2948                  * following resets all attributes to something sane.
2949                  */
2950                 if (old_was_color != vc->vc_can_do_color)
2951                         clear_buffer_attributes(vc);
2952         }
2953
2954         printk("Console: switching ");
2955         if (!deflt)
2956                 printk("consoles %d-%d ", first+1, last+1);
2957         if (j >= 0) {
2958                 struct vc_data *vc = vc_cons[j].d;
2959
2960                 printk("to %s %s %dx%d\n",
2961                        vc->vc_can_do_color ? "colour" : "mono",
2962                        desc, vc->vc_cols, vc->vc_rows);
2963
2964                 if (k >= 0) {
2965                         vc = vc_cons[k].d;
2966                         update_screen(vc);
2967                 }
2968         } else
2969                 printk("to %s\n", desc);
2970
2971         retval = 0;
2972 err:
2973         release_console_sem();
2974         module_put(owner);
2975         return retval;
2976 };
2977
2978 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2979 static int con_is_graphics(const struct consw *csw, int first, int last)
2980 {
2981         int i, retval = 0;
2982
2983         for (i = first; i <= last; i++) {
2984                 struct vc_data *vc = vc_cons[i].d;
2985
2986                 if (vc && vc->vc_mode == KD_GRAPHICS) {
2987                         retval = 1;
2988                         break;
2989                 }
2990         }
2991
2992         return retval;
2993 }
2994
2995 /**
2996  * unbind_con_driver - unbind a console driver
2997  * @csw: pointer to console driver to unregister
2998  * @first: first in range of consoles that @csw should be unbound from
2999  * @last: last in range of consoles that @csw should be unbound from
3000  * @deflt: should next bound console driver be default after @csw is unbound?
3001  *
3002  * To unbind a driver from all possible consoles, pass 0 as @first and
3003  * %MAX_NR_CONSOLES as @last.
3004  *
3005  * @deflt controls whether the console that ends up replacing @csw should be
3006  * the default console.
3007  *
3008  * RETURNS:
3009  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3010  * or 0 on success.
3011  */
3012 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3013 {
3014         struct module *owner = csw->owner;
3015         const struct consw *defcsw = NULL;
3016         struct con_driver *con_driver = NULL, *con_back = NULL;
3017         int i, retval = -ENODEV;
3018
3019         if (!try_module_get(owner))
3020                 return -ENODEV;
3021
3022         acquire_console_sem();
3023
3024         /* check if driver is registered and if it is unbindable */
3025         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3026                 con_driver = &registered_con_driver[i];
3027
3028                 if (con_driver->con == csw &&
3029                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3030                         retval = 0;
3031                         break;
3032                 }
3033         }
3034
3035         if (retval) {
3036                 release_console_sem();
3037                 goto err;
3038         }
3039
3040         retval = -ENODEV;
3041
3042         /* check if backup driver exists */
3043         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3044                 con_back = &registered_con_driver[i];
3045
3046                 if (con_back->con &&
3047                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3048                         defcsw = con_back->con;
3049                         retval = 0;
3050                         break;
3051                 }
3052         }
3053
3054         if (retval) {
3055                 release_console_sem();
3056                 goto err;
3057         }
3058
3059         if (!con_is_bound(csw)) {
3060                 release_console_sem();
3061                 goto err;
3062         }
3063
3064         first = max(first, con_driver->first);
3065         last = min(last, con_driver->last);
3066
3067         for (i = first; i <= last; i++) {
3068                 if (con_driver_map[i] == csw) {
3069                         module_put(csw->owner);
3070                         con_driver_map[i] = NULL;
3071                 }
3072         }
3073
3074         if (!con_is_bound(defcsw)) {
3075                 const struct consw *defconsw = conswitchp;
3076
3077                 defcsw->con_startup();
3078                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3079                 /*
3080                  * vgacon may change the default driver to point
3081                  * to dummycon, we restore it here...
3082                  */
3083                 conswitchp = defconsw;
3084         }
3085
3086         if (!con_is_bound(csw))
3087                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3088
3089         release_console_sem();
3090         /* ignore return value, binding should not fail */
3091         bind_con_driver(defcsw, first, last, deflt);
3092 err:
3093         module_put(owner);
3094         return retval;
3095
3096 }
3097 EXPORT_SYMBOL(unbind_con_driver);
3098
3099 static int vt_bind(struct con_driver *con)
3100 {
3101         const struct consw *defcsw = NULL, *csw = NULL;
3102         int i, more = 1, first = -1, last = -1, deflt = 0;
3103
3104         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3105             con_is_graphics(con->con, con->first, con->last))
3106                 goto err;
3107
3108         csw = con->con;
3109
3110         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3111                 struct con_driver *con = &registered_con_driver[i];
3112
3113                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3114                         defcsw = con->con;
3115                         break;
3116                 }
3117         }
3118
3119         if (!defcsw)
3120                 goto err;
3121
3122         while (more) {
3123                 more = 0;
3124
3125                 for (i = con->first; i <= con->last; i++) {
3126                         if (con_driver_map[i] == defcsw) {
3127                                 if (first == -1)
3128                                         first = i;
3129                                 last = i;
3130                                 more = 1;
3131                         } else if (first != -1)
3132                                 break;
3133                 }
3134
3135                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3136                         deflt = 1;
3137
3138                 if (first != -1)
3139                         bind_con_driver(csw, first, last, deflt);
3140
3141                 first = -1;
3142                 last = -1;
3143                 deflt = 0;
3144         }
3145
3146 err:
3147         return 0;
3148 }
3149
3150 static int vt_unbind(struct con_driver *con)
3151 {
3152         const struct consw *csw = NULL;
3153         int i, more = 1, first = -1, last = -1, deflt = 0;
3154
3155         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3156             con_is_graphics(con->con, con->first, con->last))
3157                 goto err;
3158
3159         csw = con->con;
3160
3161         while (more) {
3162                 more = 0;
3163
3164                 for (i = con->first; i <= con->last; i++) {
3165                         if (con_driver_map[i] == csw) {
3166                                 if (first == -1)
3167                                         first = i;
3168                                 last = i;
3169                                 more = 1;
3170                         } else if (first != -1)
3171                                 break;
3172                 }
3173
3174                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3175                         deflt = 1;
3176
3177                 if (first != -1)
3178                         unbind_con_driver(csw, first, last, deflt);
3179
3180                 first = -1;
3181                 last = -1;
3182                 deflt = 0;
3183         }
3184
3185 err:
3186         return 0;
3187 }
3188 #else
3189 static inline int vt_bind(struct con_driver *con)
3190 {
3191         return 0;
3192 }
3193 static inline int vt_unbind(struct con_driver *con)
3194 {
3195         return 0;
3196 }
3197 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3198
3199 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3200                           const char *buf, size_t count)
3201 {
3202         struct con_driver *con = dev_get_drvdata(dev);
3203         int bind = simple_strtoul(buf, NULL, 0);
3204
3205         if (bind)
3206                 vt_bind(con);
3207         else
3208                 vt_unbind(con);
3209
3210         return count;
3211 }
3212
3213 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3214                          char *buf)
3215 {
3216         struct con_driver *con = dev_get_drvdata(dev);
3217         int bind = con_is_bound(con->con);
3218
3219         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3220 }
3221
3222 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3223                          char *buf)
3224 {
3225         struct con_driver *con = dev_get_drvdata(dev);
3226
3227         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3228                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3229                          con->desc);
3230
3231 }
3232
3233 static struct device_attribute device_attrs[] = {
3234         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3235         __ATTR(name, S_IRUGO, show_name, NULL),
3236 };
3237
3238 static int vtconsole_init_device(struct con_driver *con)
3239 {
3240         int i;
3241         int error = 0;
3242
3243         con->flag |= CON_DRIVER_FLAG_ATTR;
3244         dev_set_drvdata(con->dev, con);
3245         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3246                 error = device_create_file(con->dev, &device_attrs[i]);
3247                 if (error)
3248                         break;
3249         }
3250
3251         if (error) {
3252                 while (--i >= 0)
3253                         device_remove_file(con->dev, &device_attrs[i]);
3254                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3255         }
3256
3257         return error;
3258 }
3259
3260 static void vtconsole_deinit_device(struct con_driver *con)
3261 {
3262         int i;
3263
3264         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3265                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3266                         device_remove_file(con->dev, &device_attrs[i]);
3267                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3268         }
3269 }
3270
3271 /**
3272  * con_is_bound - checks if driver is bound to the console
3273  * @csw: console driver
3274  *
3275  * RETURNS: zero if unbound, nonzero if bound
3276  *
3277  * Drivers can call this and if zero, they should release
3278  * all resources allocated on con_startup()
3279  */
3280 int con_is_bound(const struct consw *csw)
3281 {
3282         int i, bound = 0;
3283
3284         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3285                 if (con_driver_map[i] == csw) {
3286                         bound = 1;
3287                         break;
3288                 }
3289         }
3290
3291         return bound;
3292 }
3293 EXPORT_SYMBOL(con_is_bound);
3294
3295 /**
3296  * register_con_driver - register console driver to console layer
3297  * @csw: console driver
3298  * @first: the first console to take over, minimum value is 0
3299  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3300  *
3301  * DESCRIPTION: This function registers a console driver which can later
3302  * bind to a range of consoles specified by @first and @last. It will
3303  * also initialize the console driver by calling con_startup().
3304  */
3305 int register_con_driver(const struct consw *csw, int first, int last)
3306 {
3307         struct module *owner = csw->owner;
3308         struct con_driver *con_driver;
3309         const char *desc;
3310         int i, retval = 0;
3311
3312         if (!try_module_get(owner))
3313                 return -ENODEV;
3314
3315         acquire_console_sem();
3316
3317         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3318                 con_driver = &registered_con_driver[i];
3319
3320                 /* already registered */
3321                 if (con_driver->con == csw)
3322                         retval = -EINVAL;
3323         }
3324
3325         if (retval)
3326                 goto err;
3327
3328         desc = csw->con_startup();
3329
3330         if (!desc)
3331                 goto err;
3332
3333         retval = -EINVAL;
3334
3335         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3336                 con_driver = &registered_con_driver[i];
3337
3338                 if (con_driver->con == NULL) {
3339                         con_driver->con = csw;
3340                         con_driver->desc = desc;
3341                         con_driver->node = i;
3342                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3343                                            CON_DRIVER_FLAG_INIT;
3344                         con_driver->first = first;
3345                         con_driver->last = last;
3346                         retval = 0;
3347                         break;
3348                 }
3349         }
3350
3351         if (retval)
3352                 goto err;
3353
3354         con_driver->dev = device_create(vtconsole_class, NULL,
3355                                         MKDEV(0, con_driver->node),
3356                                         "vtcon%i", con_driver->node);
3357
3358         if (IS_ERR(con_driver->dev)) {
3359                 printk(KERN_WARNING "Unable to create device for %s; "
3360                        "errno = %ld\n", con_driver->desc,
3361                        PTR_ERR(con_driver->dev));
3362                 con_driver->dev = NULL;
3363         } else {
3364                 vtconsole_init_device(con_driver);
3365         }
3366
3367 err:
3368         release_console_sem();
3369         module_put(owner);
3370         return retval;
3371 }
3372 EXPORT_SYMBOL(register_con_driver);
3373
3374 /**
3375  * unregister_con_driver - unregister console driver from console layer
3376  * @csw: console driver
3377  *
3378  * DESCRIPTION: All drivers that registers to the console layer must
3379  * call this function upon exit, or if the console driver is in a state
3380  * where it won't be able to handle console services, such as the
3381  * framebuffer console without loaded framebuffer drivers.
3382  *
3383  * The driver must unbind first prior to unregistration.
3384  */
3385 int unregister_con_driver(const struct consw *csw)
3386 {
3387         int i, retval = -ENODEV;
3388
3389         acquire_console_sem();
3390
3391         /* cannot unregister a bound driver */
3392         if (con_is_bound(csw))
3393                 goto err;
3394
3395         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3396                 struct con_driver *con_driver = &registered_con_driver[i];
3397
3398                 if (con_driver->con == csw &&
3399                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3400                         vtconsole_deinit_device(con_driver);
3401                         device_destroy(vtconsole_class,
3402                                        MKDEV(0, con_driver->node));
3403                         con_driver->con = NULL;
3404                         con_driver->desc = NULL;
3405                         con_driver->dev = NULL;
3406                         con_driver->node = 0;
3407                         con_driver->flag = 0;
3408                         con_driver->first = 0;
3409                         con_driver->last = 0;
3410                         retval = 0;
3411                         break;
3412                 }
3413         }
3414 err:
3415         release_console_sem();
3416         return retval;
3417 }
3418 EXPORT_SYMBOL(unregister_con_driver);
3419
3420 /*
3421  *      If we support more console drivers, this function is used
3422  *      when a driver wants to take over some existing consoles
3423  *      and become default driver for newly opened ones.
3424  *
3425  *      take_over_console is basically a register followed by unbind
3426  */
3427 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3428 {
3429         int err;
3430
3431         err = register_con_driver(csw, first, last);
3432
3433         if (!err)
3434                 bind_con_driver(csw, first, last, deflt);
3435
3436         return err;
3437 }
3438
3439 /*
3440  * give_up_console is a wrapper to unregister_con_driver. It will only
3441  * work if driver is fully unbound.
3442  */
3443 void give_up_console(const struct consw *csw)
3444 {
3445         unregister_con_driver(csw);
3446 }
3447
3448 static int __init vtconsole_class_init(void)
3449 {
3450         int i;
3451
3452         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3453         if (IS_ERR(vtconsole_class)) {
3454                 printk(KERN_WARNING "Unable to create vt console class; "
3455                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3456                 vtconsole_class = NULL;
3457         }
3458
3459         /* Add system drivers to sysfs */
3460         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3461                 struct con_driver *con = &registered_con_driver[i];
3462
3463                 if (con->con && !con->dev) {
3464                         con->dev = device_create(vtconsole_class, NULL,
3465                                                  MKDEV(0, con->node),
3466                                                  "vtcon%i", con->node);
3467
3468                         if (IS_ERR(con->dev)) {
3469                                 printk(KERN_WARNING "Unable to create "
3470                                        "device for %s; errno = %ld\n",
3471                                        con->desc, PTR_ERR(con->dev));
3472                                 con->dev = NULL;
3473                         } else {
3474                                 vtconsole_init_device(con);
3475                         }
3476                 }
3477         }
3478
3479         return 0;
3480 }
3481 postcore_initcall(vtconsole_class_init);
3482
3483 #endif
3484
3485 /*
3486  *      Screen blanking
3487  */
3488
3489 static int set_vesa_blanking(char __user *p)
3490 {
3491         unsigned int mode;
3492
3493         if (get_user(mode, p + 1))
3494                 return -EFAULT;
3495
3496         vesa_blank_mode = (mode < 4) ? mode : 0;
3497         return 0;
3498 }
3499
3500 void do_blank_screen(int entering_gfx)
3501 {
3502         struct vc_data *vc = vc_cons[fg_console].d;
3503         int i;
3504
3505         WARN_CONSOLE_UNLOCKED();
3506
3507         if (console_blanked) {
3508                 if (blank_state == blank_vesa_wait) {
3509                         blank_state = blank_off;
3510                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3511                 }
3512                 return;
3513         }
3514
3515         /* entering graphics mode? */
3516         if (entering_gfx) {
3517                 hide_cursor(vc);
3518                 save_screen(vc);
3519                 vc->vc_sw->con_blank(vc, -1, 1);
3520                 console_blanked = fg_console + 1;
3521                 blank_state = blank_off;
3522                 set_origin(vc);
3523                 return;
3524         }
3525
3526         if (blank_state != blank_normal_wait)
3527                 return;
3528         blank_state = blank_off;
3529
3530         /* don't blank graphics */
3531         if (vc->vc_mode != KD_TEXT) {
3532                 console_blanked = fg_console + 1;
3533                 return;
3534         }
3535
3536         hide_cursor(vc);
3537         del_timer_sync(&console_timer);
3538         blank_timer_expired = 0;
3539
3540         save_screen(vc);
3541         /* In case we need to reset origin, blanking hook returns 1 */
3542         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3543         console_blanked = fg_console + 1;
3544         if (i)
3545                 set_origin(vc);
3546
3547         if (console_blank_hook && console_blank_hook(1))
3548                 return;
3549
3550         if (vesa_off_interval && vesa_blank_mode) {
3551                 blank_state = blank_vesa_wait;
3552                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3553         }
3554 }
3555 EXPORT_SYMBOL(do_blank_screen);
3556
3557 /*
3558  * Called by timer as well as from vt_console_driver
3559  */
3560 void do_unblank_screen(int leaving_gfx)
3561 {
3562         struct vc_data *vc;
3563
3564         /* This should now always be called from a "sane" (read: can schedule)
3565          * context for the sake of the low level drivers, except in the special
3566          * case of oops_in_progress
3567          */
3568         if (!oops_in_progress)
3569                 might_sleep();
3570
3571         WARN_CONSOLE_UNLOCKED();
3572
3573         ignore_poke = 0;
3574         if (!console_blanked)
3575                 return;
3576         if (!vc_cons_allocated(fg_console)) {
3577                 /* impossible */
3578                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3579                 return;
3580         }
3581         vc = vc_cons[fg_console].d;
3582         if (vc->vc_mode != KD_TEXT)
3583                 return; /* but leave console_blanked != 0 */
3584
3585         if (blankinterval) {
3586                 mod_timer(&console_timer, jiffies + blankinterval);
3587                 blank_state = blank_normal_wait;
3588         }
3589
3590         console_blanked = 0;
3591         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3592                 /* Low-level driver cannot restore -> do it ourselves */
3593                 update_screen(vc);
3594         if (console_blank_hook)
3595                 console_blank_hook(0);
3596         set_palette(vc);
3597         set_cursor(vc);
3598 }
3599 EXPORT_SYMBOL(do_unblank_screen);
3600
3601 /*
3602  * This is called by the outside world to cause a forced unblank, mostly for
3603  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3604  * call it with 1 as an argument and so force a mode restore... that may kill
3605  * X or at least garbage the screen but would also make the Oops visible...
3606  */
3607 void unblank_screen(void)
3608 {
3609         do_unblank_screen(0);
3610 }
3611
3612 /*
3613  * We defer the timer blanking to work queue so it can take the console mutex
3614  * (console operations can still happen at irq time, but only from printk which
3615  * has the console mutex. Not perfect yet, but better than no locking
3616  */
3617 static void blank_screen_t(unsigned long dummy)
3618 {
3619         if (unlikely(!keventd_up())) {
3620                 mod_timer(&console_timer, jiffies + blankinterval);
3621                 return;
3622         }
3623         blank_timer_expired = 1;
3624         schedule_work(&console_work);
3625 }
3626
3627 void poke_blanked_console(void)
3628 {
3629         WARN_CONSOLE_UNLOCKED();
3630
3631         /* Add this so we quickly catch whoever might call us in a non
3632          * safe context. Nowadays, unblank_screen() isn't to be called in
3633          * atomic contexts and is allowed to schedule (with the special case
3634          * of oops_in_progress, but that isn't of any concern for this
3635          * function. --BenH.
3636          */
3637         might_sleep();
3638
3639         /* This isn't perfectly race free, but a race here would be mostly harmless,
3640          * at worse, we'll do a spurrious blank and it's unlikely
3641          */
3642         del_timer(&console_timer);
3643         blank_timer_expired = 0;
3644
3645         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3646                 return;
3647         if (console_blanked)
3648                 unblank_screen();
3649         else if (blankinterval) {
3650                 mod_timer(&console_timer, jiffies + blankinterval);
3651                 blank_state = blank_normal_wait;
3652         }
3653 }
3654
3655 /*
3656  *      Palettes
3657  */
3658
3659 static void set_palette(struct vc_data *vc)
3660 {
3661         WARN_CONSOLE_UNLOCKED();
3662
3663         if (vc->vc_mode != KD_GRAPHICS)
3664                 vc->vc_sw->con_set_palette(vc, color_table);
3665 }
3666
3667 static int set_get_cmap(unsigned char __user *arg, int set)
3668 {
3669     int i, j, k;
3670
3671     WARN_CONSOLE_UNLOCKED();
3672
3673     for (i = 0; i < 16; i++)
3674         if (set) {
3675             get_user(default_red[i], arg++);
3676             get_user(default_grn[i], arg++);
3677             get_user(default_blu[i], arg++);
3678         } else {
3679             put_user(default_red[i], arg++);
3680             put_user(default_grn[i], arg++);
3681             put_user(default_blu[i], arg++);
3682         }
3683     if (set) {
3684         for (i = 0; i < MAX_NR_CONSOLES; i++)
3685             if (vc_cons_allocated(i)) {
3686                 for (j = k = 0; j < 16; j++) {
3687                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3688                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3689                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3690                 }
3691                 set_palette(vc_cons[i].d);
3692             }
3693     }
3694     return 0;
3695 }
3696
3697 /*
3698  * Load palette into the DAC registers. arg points to a colour
3699  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3700  */
3701
3702 int con_set_cmap(unsigned char __user *arg)
3703 {
3704         int rc;
3705
3706         acquire_console_sem();
3707         rc = set_get_cmap (arg,1);
3708         release_console_sem();
3709
3710         return rc;
3711 }
3712
3713 int con_get_cmap(unsigned char __user *arg)
3714 {
3715         int rc;
3716
3717         acquire_console_sem();
3718         rc = set_get_cmap (arg,0);
3719         release_console_sem();
3720
3721         return rc;
3722 }
3723
3724 void reset_palette(struct vc_data *vc)
3725 {
3726         int j, k;
3727         for (j=k=0; j<16; j++) {
3728                 vc->vc_palette[k++] = default_red[j];
3729                 vc->vc_palette[k++] = default_grn[j];
3730                 vc->vc_palette[k++] = default_blu[j];
3731         }
3732         set_palette(vc);
3733 }
3734
3735 /*
3736  *  Font switching
3737  *
3738  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3739  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 
3740  *  depending on width) reserved for each character which is kinda wasty, but 
3741  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It 
3742  *  is upto the actual low-level console-driver convert data into its favorite
3743  *  format (maybe we should add a `fontoffset' field to the `display'
3744  *  structure so we won't have to convert the fontdata all the time.
3745  *  /Jes
3746  */
3747
3748 #define max_font_size 65536
3749
3750 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3751 {
3752         struct console_font font;
3753         int rc = -EINVAL;
3754         int c;
3755
3756         if (vc->vc_mode != KD_TEXT)
3757                 return -EINVAL;
3758
3759         if (op->data) {
3760                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3761                 if (!font.data)
3762                         return -ENOMEM;
3763         } else
3764                 font.data = NULL;
3765
3766         acquire_console_sem();
3767         if (vc->vc_sw->con_font_get)
3768                 rc = vc->vc_sw->con_font_get(vc, &font);
3769         else
3770                 rc = -ENOSYS;
3771         release_console_sem();
3772
3773         if (rc)
3774                 goto out;
3775
3776         c = (font.width+7)/8 * 32 * font.charcount;
3777         
3778         if (op->data && font.charcount > op->charcount)
3779                 rc = -ENOSPC;
3780         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3781                 if (font.width > op->width || font.height > op->height) 
3782                         rc = -ENOSPC;
3783         } else {
3784                 if (font.width != 8)
3785                         rc = -EIO;
3786                 else if ((op->height && font.height > op->height) ||
3787                          font.height > 32)
3788                         rc = -ENOSPC;
3789         }
3790         if (rc)
3791                 goto out;
3792
3793         op->height = font.height;
3794         op->width = font.width;
3795         op->charcount = font.charcount;
3796
3797         if (op->data && copy_to_user(op->data, font.data, c))
3798                 rc = -EFAULT;
3799
3800 out:
3801         kfree(font.data);
3802         return rc;
3803 }
3804
3805 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3806 {
3807         struct console_font font;
3808         int rc = -EINVAL;
3809         int size;
3810
3811         if (vc->vc_mode != KD_TEXT)
3812                 return -EINVAL;
3813         if (!op->data)
3814                 return -EINVAL;
3815         if (op->charcount > 512)
3816                 return -EINVAL;
3817         if (!op->height) {              /* Need to guess font height [compat] */
3818                 int h, i;
3819                 u8 __user *charmap = op->data;
3820                 u8 tmp;
3821                 
3822                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3823                    so that we can get rid of this soon */
3824                 if (!(op->flags & KD_FONT_FLAG_OLD))
3825                         return -EINVAL;
3826                 for (h = 32; h > 0; h--)
3827                         for (i = 0; i < op->charcount; i++) {
3828                                 if (get_user(tmp, &charmap[32*i+h-1]))
3829                                         return -EFAULT;
3830                                 if (tmp)
3831                                         goto nonzero;
3832                         }
3833                 return -EINVAL;
3834         nonzero:
3835                 op->height = h;
3836         }
3837         if (op->width <= 0 || op->width > 32 || op->height > 32)
3838                 return -EINVAL;
3839         size = (op->width+7)/8 * 32 * op->charcount;
3840         if (size > max_font_size)
3841                 return -ENOSPC;
3842         font.charcount = op->charcount;
3843         font.height = op->height;
3844         font.width = op->width;
3845         font.data = kmalloc(size, GFP_KERNEL);
3846         if (!font.data)
3847                 return -ENOMEM;
3848         if (copy_from_user(font.data, op->data, size)) {
3849                 kfree(font.data);
3850                 return -EFAULT;
3851         }
3852         acquire_console_sem();
3853         if (vc->vc_sw->con_font_set)
3854                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3855         else
3856                 rc = -ENOSYS;
3857         release_console_sem();
3858         kfree(font.data);
3859         return rc;
3860 }
3861
3862 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3863 {
3864         struct console_font font = {.width = op->width, .height = op->height};
3865         char name[MAX_FONT_NAME];
3866         char *s = name;
3867         int rc;
3868
3869         if (vc->vc_mode != KD_TEXT)
3870                 return -EINVAL;
3871
3872         if (!op->data)
3873                 s = NULL;
3874         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3875                 return -EFAULT;
3876         else
3877                 name[MAX_FONT_NAME - 1] = 0;
3878
3879         acquire_console_sem();
3880         if (vc->vc_sw->con_font_default)
3881                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3882         else
3883                 rc = -ENOSYS;
3884         release_console_sem();
3885         if (!rc) {
3886                 op->width = font.width;
3887                 op->height = font.height;
3888         }
3889         return rc;
3890 }
3891
3892 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3893 {
3894         int con = op->height;
3895         int rc;
3896
3897         if (vc->vc_mode != KD_TEXT)
3898                 return -EINVAL;
3899
3900         acquire_console_sem();
3901         if (!vc->vc_sw->con_font_copy)
3902                 rc = -ENOSYS;
3903         else if (con < 0 || !vc_cons_allocated(con))
3904                 rc = -ENOTTY;
3905         else if (con == vc->vc_num)     /* nothing to do */
3906                 rc = 0;
3907         else
3908                 rc = vc->vc_sw->con_font_copy(vc, con);
3909         release_console_sem();
3910         return rc;
3911 }
3912
3913 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3914 {
3915         switch (op->op) {
3916         case KD_FONT_OP_SET:
3917                 return con_font_set(vc, op);
3918         case KD_FONT_OP_GET:
3919                 return con_font_get(vc, op);
3920         case KD_FONT_OP_SET_DEFAULT:
3921                 return con_font_default(vc, op);
3922         case KD_FONT_OP_COPY:
3923                 return con_font_copy(vc, op);
3924         }
3925         return -ENOSYS;
3926 }
3927
3928 /*
3929  *      Interface exported to selection and vcs.
3930  */
3931
3932 /* used by selection */
3933 u16 screen_glyph(struct vc_data *vc, int offset)
3934 {
3935         u16 w = scr_readw(screenpos(vc, offset, 1));
3936         u16 c = w & 0xff;
3937
3938         if (w & vc->vc_hi_font_mask)
3939                 c |= 0x100;
3940         return c;
3941 }
3942
3943 /* used by vcs - note the word offset */
3944 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3945 {
3946         return screenpos(vc, 2 * w_offset, viewed);
3947 }
3948
3949 void getconsxy(struct vc_data *vc, unsigned char *p)
3950 {
3951         p[0] = vc->vc_x;
3952         p[1] = vc->vc_y;
3953 }
3954
3955 void putconsxy(struct vc_data *vc, unsigned char *p)
3956 {
3957         hide_cursor(vc);
3958         gotoxy(vc, p[0], p[1]);
3959         set_cursor(vc);
3960 }
3961
3962 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3963 {
3964         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3965                 return softcursor_original;
3966         return scr_readw(org);
3967 }
3968
3969 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3970 {
3971         scr_writew(val, org);
3972         if ((unsigned long)org == vc->vc_pos) {
3973                 softcursor_original = -1;
3974                 add_softcursor(vc);
3975         }
3976 }
3977
3978 /*
3979  *      Visible symbols for modules
3980  */
3981
3982 EXPORT_SYMBOL(color_table);
3983 EXPORT_SYMBOL(default_red);
3984 EXPORT_SYMBOL(default_grn);
3985 EXPORT_SYMBOL(default_blu);
3986 EXPORT_SYMBOL(update_region);
3987 EXPORT_SYMBOL(redraw_screen);
3988 EXPORT_SYMBOL(vc_resize);
3989 EXPORT_SYMBOL(vc_lock_resize);
3990 EXPORT_SYMBOL(fg_console);
3991 EXPORT_SYMBOL(console_blank_hook);
3992 EXPORT_SYMBOL(console_blanked);
3993 EXPORT_SYMBOL(vc_cons);
3994 #ifndef VT_SINGLE_DRIVER
3995 EXPORT_SYMBOL(take_over_console);
3996 EXPORT_SYMBOL(give_up_console);
3997 #endif