bbd9fc412877a035d7ee13154361836e23b5c3fa
[sfrench/cifs-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 = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
733             if (!vc)
734                 return -ENOMEM;
735             memset(vc, 0, sizeof(*vc));
736             vc_cons[currcons].d = vc;
737             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
738             visual_init(vc, currcons, 1);
739             if (!*vc->vc_uni_pagedir_loc)
740                 con_set_default_unimap(vc);
741             if (!vc->vc_kmalloced)
742                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
743             if (!vc->vc_screenbuf) {
744                 kfree(vc);
745                 vc_cons[currcons].d = NULL;
746                 return -ENOMEM;
747             }
748             vc->vc_kmalloced = 1;
749             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
750         }
751         return 0;
752 }
753
754 static inline int resize_screen(struct vc_data *vc, int width, int height)
755 {
756         /* Resizes the resolution of the display adapater */
757         int err = 0;
758
759         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
760                 err = vc->vc_sw->con_resize(vc, width, height);
761         return err;
762 }
763
764 /*
765  * Change # of rows and columns (0 means unchanged/the size of fg_console)
766  * [this is to be used together with some user program
767  * like resize that changes the hardware videomode]
768  */
769 #define VC_RESIZE_MAXCOL (32767)
770 #define VC_RESIZE_MAXROW (32767)
771 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
772 {
773         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
774         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
775         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
776         unsigned int end;
777         unsigned short *newscreen;
778
779         WARN_CONSOLE_UNLOCKED();
780
781         if (!vc)
782                 return -ENXIO;
783
784         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
785                 return -EINVAL;
786
787         new_cols = (cols ? cols : vc->vc_cols);
788         new_rows = (lines ? lines : vc->vc_rows);
789         new_row_size = new_cols << 1;
790         new_screen_size = new_row_size * new_rows;
791
792         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
793                 return 0;
794
795         newscreen = kmalloc(new_screen_size, GFP_USER);
796         if (!newscreen)
797                 return -ENOMEM;
798
799         old_rows = vc->vc_rows;
800         old_cols = vc->vc_cols;
801         old_row_size = vc->vc_size_row;
802         old_screen_size = vc->vc_screenbuf_size;
803
804         err = resize_screen(vc, new_cols, new_rows);
805         if (err) {
806                 kfree(newscreen);
807                 return err;
808         }
809
810         vc->vc_rows = new_rows;
811         vc->vc_cols = new_cols;
812         vc->vc_size_row = new_row_size;
813         vc->vc_screenbuf_size = new_screen_size;
814
815         rlth = min(old_row_size, new_row_size);
816         rrem = new_row_size - rlth;
817         old_origin = vc->vc_origin;
818         new_origin = (long) newscreen;
819         new_scr_end = new_origin + new_screen_size;
820
821         if (vc->vc_y > new_rows) {
822                 if (old_rows - vc->vc_y < new_rows) {
823                         /*
824                          * Cursor near the bottom, copy contents from the
825                          * bottom of buffer
826                          */
827                         old_origin += (old_rows - new_rows) * old_row_size;
828                         end = vc->vc_scr_end;
829                 } else {
830                         /*
831                          * Cursor is in no man's land, copy 1/2 screenful
832                          * from the top and bottom of cursor position
833                          */
834                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
835                         end = old_origin + (old_row_size * new_rows);
836                 }
837         } else
838                 /*
839                  * Cursor near the top, copy contents from the top of buffer
840                  */
841                 end = (old_rows > new_rows) ? old_origin +
842                         (old_row_size * new_rows) :
843                         vc->vc_scr_end;
844
845         update_attr(vc);
846
847         while (old_origin < end) {
848                 scr_memcpyw((unsigned short *) new_origin,
849                             (unsigned short *) old_origin, rlth);
850                 if (rrem)
851                         scr_memsetw((void *)(new_origin + rlth),
852                                     vc->vc_video_erase_char, rrem);
853                 old_origin += old_row_size;
854                 new_origin += new_row_size;
855         }
856         if (new_scr_end > new_origin)
857                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
858                             new_scr_end - new_origin);
859         if (vc->vc_kmalloced)
860                 kfree(vc->vc_screenbuf);
861         vc->vc_screenbuf = newscreen;
862         vc->vc_kmalloced = 1;
863         vc->vc_screenbuf_size = new_screen_size;
864         set_origin(vc);
865
866         /* do part of a reset_terminal() */
867         vc->vc_top = 0;
868         vc->vc_bottom = vc->vc_rows;
869         gotoxy(vc, vc->vc_x, vc->vc_y);
870         save_cur(vc);
871
872         if (vc->vc_tty) {
873                 struct winsize ws, *cws = &vc->vc_tty->winsize;
874
875                 memset(&ws, 0, sizeof(ws));
876                 ws.ws_row = vc->vc_rows;
877                 ws.ws_col = vc->vc_cols;
878                 ws.ws_ypixel = vc->vc_scan_lines;
879                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
880                     vc->vc_tty->pgrp)
881                         kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
882                 *cws = ws;
883         }
884
885         if (CON_IS_VISIBLE(vc))
886                 update_screen(vc);
887         return err;
888 }
889
890 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
891 {
892         int rc;
893
894         acquire_console_sem();
895         rc = vc_resize(vc, cols, lines);
896         release_console_sem();
897         return rc;
898 }
899
900 void vc_deallocate(unsigned int currcons)
901 {
902         WARN_CONSOLE_UNLOCKED();
903
904         if (vc_cons_allocated(currcons)) {
905                 struct vc_data *vc = vc_cons[currcons].d;
906                 vc->vc_sw->con_deinit(vc);
907                 put_pid(vc->vt_pid);
908                 module_put(vc->vc_sw->owner);
909                 if (vc->vc_kmalloced)
910                         kfree(vc->vc_screenbuf);
911                 if (currcons >= MIN_NR_CONSOLES)
912                         kfree(vc);
913                 vc_cons[currcons].d = NULL;
914         }
915 }
916
917 /*
918  *      VT102 emulator
919  */
920
921 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
922 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
923 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
924
925 #define decarm          VC_REPEAT
926 #define decckm          VC_CKMODE
927 #define kbdapplic       VC_APPLIC
928 #define lnm             VC_CRLF
929
930 /*
931  * this is what the terminal answers to a ESC-Z or csi0c query.
932  */
933 #define VT100ID "\033[?1;2c"
934 #define VT102ID "\033[?6c"
935
936 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
937                                        8,12,10,14, 9,13,11,15 };
938
939 /* the default colour table, for VGA+ colour systems */
940 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
941     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
942 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
943     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
944 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
945     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
946
947 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
948 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
949 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
950
951 /*
952  * gotoxy() must verify all boundaries, because the arguments
953  * might also be negative. If the given position is out of
954  * bounds, the cursor is placed at the nearest margin.
955  */
956 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
957 {
958         int min_y, max_y;
959
960         if (new_x < 0)
961                 vc->vc_x = 0;
962         else {
963                 if (new_x >= vc->vc_cols)
964                         vc->vc_x = vc->vc_cols - 1;
965                 else
966                         vc->vc_x = new_x;
967         }
968
969         if (vc->vc_decom) {
970                 min_y = vc->vc_top;
971                 max_y = vc->vc_bottom;
972         } else {
973                 min_y = 0;
974                 max_y = vc->vc_rows;
975         }
976         if (new_y < min_y)
977                 vc->vc_y = min_y;
978         else if (new_y >= max_y)
979                 vc->vc_y = max_y - 1;
980         else
981                 vc->vc_y = new_y;
982         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
983         vc->vc_need_wrap = 0;
984 }
985
986 /* for absolute user moves, when decom is set */
987 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
988 {
989         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
990 }
991
992 void scrollback(struct vc_data *vc, int lines)
993 {
994         if (!lines)
995                 lines = vc->vc_rows / 2;
996         scrolldelta(-lines);
997 }
998
999 void scrollfront(struct vc_data *vc, int lines)
1000 {
1001         if (!lines)
1002                 lines = vc->vc_rows / 2;
1003         scrolldelta(lines);
1004 }
1005
1006 static void lf(struct vc_data *vc)
1007 {
1008         /* don't scroll if above bottom of scrolling region, or
1009          * if below scrolling region
1010          */
1011         if (vc->vc_y + 1 == vc->vc_bottom)
1012                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1013         else if (vc->vc_y < vc->vc_rows - 1) {
1014                 vc->vc_y++;
1015                 vc->vc_pos += vc->vc_size_row;
1016         }
1017         vc->vc_need_wrap = 0;
1018 }
1019
1020 static void ri(struct vc_data *vc)
1021 {
1022         /* don't scroll if below top of scrolling region, or
1023          * if above scrolling region
1024          */
1025         if (vc->vc_y == vc->vc_top)
1026                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1027         else if (vc->vc_y > 0) {
1028                 vc->vc_y--;
1029                 vc->vc_pos -= vc->vc_size_row;
1030         }
1031         vc->vc_need_wrap = 0;
1032 }
1033
1034 static inline void cr(struct vc_data *vc)
1035 {
1036         vc->vc_pos -= vc->vc_x << 1;
1037         vc->vc_need_wrap = vc->vc_x = 0;
1038 }
1039
1040 static inline void bs(struct vc_data *vc)
1041 {
1042         if (vc->vc_x) {
1043                 vc->vc_pos -= 2;
1044                 vc->vc_x--;
1045                 vc->vc_need_wrap = 0;
1046         }
1047 }
1048
1049 static inline void del(struct vc_data *vc)
1050 {
1051         /* ignored */
1052 }
1053
1054 static void csi_J(struct vc_data *vc, int vpar)
1055 {
1056         unsigned int count;
1057         unsigned short * start;
1058
1059         switch (vpar) {
1060                 case 0: /* erase from cursor to end of display */
1061                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1062                         start = (unsigned short *)vc->vc_pos;
1063                         if (DO_UPDATE(vc)) {
1064                                 /* do in two stages */
1065                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1066                                               vc->vc_cols - vc->vc_x);
1067                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1068                                               vc->vc_rows - vc->vc_y - 1,
1069                                               vc->vc_cols);
1070                         }
1071                         break;
1072                 case 1: /* erase from start to cursor */
1073                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1074                         start = (unsigned short *)vc->vc_origin;
1075                         if (DO_UPDATE(vc)) {
1076                                 /* do in two stages */
1077                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1078                                               vc->vc_cols);
1079                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1080                                               vc->vc_x + 1);
1081                         }
1082                         break;
1083                 case 2: /* erase whole display */
1084                         count = vc->vc_cols * vc->vc_rows;
1085                         start = (unsigned short *)vc->vc_origin;
1086                         if (DO_UPDATE(vc))
1087                                 vc->vc_sw->con_clear(vc, 0, 0,
1088                                               vc->vc_rows,
1089                                               vc->vc_cols);
1090                         break;
1091                 default:
1092                         return;
1093         }
1094         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1095         vc->vc_need_wrap = 0;
1096 }
1097
1098 static void csi_K(struct vc_data *vc, int vpar)
1099 {
1100         unsigned int count;
1101         unsigned short * start;
1102
1103         switch (vpar) {
1104                 case 0: /* erase from cursor to end of line */
1105                         count = vc->vc_cols - vc->vc_x;
1106                         start = (unsigned short *)vc->vc_pos;
1107                         if (DO_UPDATE(vc))
1108                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1109                                                      vc->vc_cols - vc->vc_x);
1110                         break;
1111                 case 1: /* erase from start of line to cursor */
1112                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1113                         count = vc->vc_x + 1;
1114                         if (DO_UPDATE(vc))
1115                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1116                                                      vc->vc_x + 1);
1117                         break;
1118                 case 2: /* erase whole line */
1119                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1120                         count = vc->vc_cols;
1121                         if (DO_UPDATE(vc))
1122                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1123                                               vc->vc_cols);
1124                         break;
1125                 default:
1126                         return;
1127         }
1128         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1129         vc->vc_need_wrap = 0;
1130 }
1131
1132 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1133 {                                         /* not vt100? */
1134         int count;
1135
1136         if (!vpar)
1137                 vpar++;
1138         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1139
1140         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1141         if (DO_UPDATE(vc))
1142                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1143         vc->vc_need_wrap = 0;
1144 }
1145
1146 static void default_attr(struct vc_data *vc)
1147 {
1148         vc->vc_intensity = 1;
1149         vc->vc_italic = 0;
1150         vc->vc_underline = 0;
1151         vc->vc_reverse = 0;
1152         vc->vc_blink = 0;
1153         vc->vc_color = vc->vc_def_color;
1154 }
1155
1156 /* console_sem is held */
1157 static void csi_m(struct vc_data *vc)
1158 {
1159         int i;
1160
1161         for (i = 0; i <= vc->vc_npar; i++)
1162                 switch (vc->vc_par[i]) {
1163                         case 0: /* all attributes off */
1164                                 default_attr(vc);
1165                                 break;
1166                         case 1:
1167                                 vc->vc_intensity = 2;
1168                                 break;
1169                         case 2:
1170                                 vc->vc_intensity = 0;
1171                                 break;
1172                         case 3:
1173                                 vc->vc_italic = 1;
1174                                 break;
1175                         case 4:
1176                                 vc->vc_underline = 1;
1177                                 break;
1178                         case 5:
1179                                 vc->vc_blink = 1;
1180                                 break;
1181                         case 7:
1182                                 vc->vc_reverse = 1;
1183                                 break;
1184                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1185                                   * Select primary font, don't display
1186                                   * control chars if defined, don't set
1187                                   * bit 8 on output.
1188                                   */
1189                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1190                                                 ? vc->vc_G0_charset
1191                                                 : vc->vc_G1_charset, vc);
1192                                 vc->vc_disp_ctrl = 0;
1193                                 vc->vc_toggle_meta = 0;
1194                                 break;
1195                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1196                                   * Select first alternate font, lets
1197                                   * chars < 32 be displayed as ROM chars.
1198                                   */
1199                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1200                                 vc->vc_disp_ctrl = 1;
1201                                 vc->vc_toggle_meta = 0;
1202                                 break;
1203                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1204                                   * Select second alternate font, toggle
1205                                   * high bit before displaying as ROM char.
1206                                   */
1207                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1208                                 vc->vc_disp_ctrl = 1;
1209                                 vc->vc_toggle_meta = 1;
1210                                 break;
1211                         case 21:
1212                         case 22:
1213                                 vc->vc_intensity = 1;
1214                                 break;
1215                         case 23:
1216                                 vc->vc_italic = 0;
1217                                 break;
1218                         case 24:
1219                                 vc->vc_underline = 0;
1220                                 break;
1221                         case 25:
1222                                 vc->vc_blink = 0;
1223                                 break;
1224                         case 27:
1225                                 vc->vc_reverse = 0;
1226                                 break;
1227                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1228                                   * Enables underscore, white foreground
1229                                   * with white underscore (Linux - use
1230                                   * default foreground).
1231                                   */
1232                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1233                                 vc->vc_underline = 1;
1234                                 break;
1235                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1236                                   * Disable underline option.
1237                                   * Reset colour to default? It did this
1238                                   * before...
1239                                   */
1240                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1241                                 vc->vc_underline = 0;
1242                                 break;
1243                         case 49:
1244                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1245                                 break;
1246                         default:
1247                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1248                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1249                                                 | (vc->vc_color & 0xf0);
1250                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1251                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1252                                                 | (vc->vc_color & 0x0f);
1253                                 break;
1254                 }
1255         update_attr(vc);
1256 }
1257
1258 static void respond_string(const char *p, struct tty_struct *tty)
1259 {
1260         while (*p) {
1261                 tty_insert_flip_char(tty, *p, 0);
1262                 p++;
1263         }
1264         con_schedule_flip(tty);
1265 }
1266
1267 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1268 {
1269         char buf[40];
1270
1271         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1272         respond_string(buf, tty);
1273 }
1274
1275 static inline void status_report(struct tty_struct *tty)
1276 {
1277         respond_string("\033[0n", tty); /* Terminal ok */
1278 }
1279
1280 static inline void respond_ID(struct tty_struct * tty)
1281 {
1282         respond_string(VT102ID, tty);
1283 }
1284
1285 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1286 {
1287         char buf[8];
1288
1289         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1290                 (char)('!' + mry));
1291         respond_string(buf, tty);
1292 }
1293
1294 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1295 int mouse_reporting(void)
1296 {
1297         return vc_cons[fg_console].d->vc_report_mouse;
1298 }
1299
1300 /* console_sem is held */
1301 static void set_mode(struct vc_data *vc, int on_off)
1302 {
1303         int i;
1304
1305         for (i = 0; i <= vc->vc_npar; i++)
1306                 if (vc->vc_ques) {
1307                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1308                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1309                                 if (on_off)
1310                                         set_kbd(vc, decckm);
1311                                 else
1312                                         clr_kbd(vc, decckm);
1313                                 break;
1314                         case 3: /* 80/132 mode switch unimplemented */
1315                                 vc->vc_deccolm = on_off;
1316 #if 0
1317                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1318                                 /* this alone does not suffice; some user mode
1319                                    utility has to change the hardware regs */
1320 #endif
1321                                 break;
1322                         case 5:                 /* Inverted screen on/off */
1323                                 if (vc->vc_decscnm != on_off) {
1324                                         vc->vc_decscnm = on_off;
1325                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1326                                         update_attr(vc);
1327                                 }
1328                                 break;
1329                         case 6:                 /* Origin relative/absolute */
1330                                 vc->vc_decom = on_off;
1331                                 gotoxay(vc, 0, 0);
1332                                 break;
1333                         case 7:                 /* Autowrap on/off */
1334                                 vc->vc_decawm = on_off;
1335                                 break;
1336                         case 8:                 /* Autorepeat on/off */
1337                                 if (on_off)
1338                                         set_kbd(vc, decarm);
1339                                 else
1340                                         clr_kbd(vc, decarm);
1341                                 break;
1342                         case 9:
1343                                 vc->vc_report_mouse = on_off ? 1 : 0;
1344                                 break;
1345                         case 25:                /* Cursor on/off */
1346                                 vc->vc_deccm = on_off;
1347                                 break;
1348                         case 1000:
1349                                 vc->vc_report_mouse = on_off ? 2 : 0;
1350                                 break;
1351                         }
1352                 } else {
1353                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1354                         case 3:                 /* Monitor (display ctrls) */
1355                                 vc->vc_disp_ctrl = on_off;
1356                                 break;
1357                         case 4:                 /* Insert Mode on/off */
1358                                 vc->vc_decim = on_off;
1359                                 break;
1360                         case 20:                /* Lf, Enter == CrLf/Lf */
1361                                 if (on_off)
1362                                         set_kbd(vc, lnm);
1363                                 else
1364                                         clr_kbd(vc, lnm);
1365                                 break;
1366                         }
1367                 }
1368 }
1369
1370 /* console_sem is held */
1371 static void setterm_command(struct vc_data *vc)
1372 {
1373         switch(vc->vc_par[0]) {
1374                 case 1: /* set color for underline mode */
1375                         if (vc->vc_can_do_color &&
1376                                         vc->vc_par[1] < 16) {
1377                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1378                                 if (vc->vc_underline)
1379                                         update_attr(vc);
1380                         }
1381                         break;
1382                 case 2: /* set color for half intensity mode */
1383                         if (vc->vc_can_do_color &&
1384                                         vc->vc_par[1] < 16) {
1385                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1386                                 if (vc->vc_intensity == 0)
1387                                         update_attr(vc);
1388                         }
1389                         break;
1390                 case 8: /* store colors as defaults */
1391                         vc->vc_def_color = vc->vc_attr;
1392                         if (vc->vc_hi_font_mask == 0x100)
1393                                 vc->vc_def_color >>= 1;
1394                         default_attr(vc);
1395                         update_attr(vc);
1396                         break;
1397                 case 9: /* set blanking interval */
1398                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1399                         poke_blanked_console();
1400                         break;
1401                 case 10: /* set bell frequency in Hz */
1402                         if (vc->vc_npar >= 1)
1403                                 vc->vc_bell_pitch = vc->vc_par[1];
1404                         else
1405                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1406                         break;
1407                 case 11: /* set bell duration in msec */
1408                         if (vc->vc_npar >= 1)
1409                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1410                                         vc->vc_par[1] * HZ / 1000 : 0;
1411                         else
1412                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1413                         break;
1414                 case 12: /* bring specified console to the front */
1415                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1416                                 set_console(vc->vc_par[1] - 1);
1417                         break;
1418                 case 13: /* unblank the screen */
1419                         poke_blanked_console();
1420                         break;
1421                 case 14: /* set vesa powerdown interval */
1422                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1423                         break;
1424                 case 15: /* activate the previous console */
1425                         set_console(last_console);
1426                         break;
1427         }
1428 }
1429
1430 /* console_sem is held */
1431 static void csi_at(struct vc_data *vc, unsigned int nr)
1432 {
1433         if (nr > vc->vc_cols - vc->vc_x)
1434                 nr = vc->vc_cols - vc->vc_x;
1435         else if (!nr)
1436                 nr = 1;
1437         insert_char(vc, nr);
1438 }
1439
1440 /* console_sem is held */
1441 static void csi_L(struct vc_data *vc, unsigned int nr)
1442 {
1443         if (nr > vc->vc_rows - vc->vc_y)
1444                 nr = vc->vc_rows - vc->vc_y;
1445         else if (!nr)
1446                 nr = 1;
1447         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1448         vc->vc_need_wrap = 0;
1449 }
1450
1451 /* console_sem is held */
1452 static void csi_P(struct vc_data *vc, unsigned int nr)
1453 {
1454         if (nr > vc->vc_cols - vc->vc_x)
1455                 nr = vc->vc_cols - vc->vc_x;
1456         else if (!nr)
1457                 nr = 1;
1458         delete_char(vc, nr);
1459 }
1460
1461 /* console_sem is held */
1462 static void csi_M(struct vc_data *vc, unsigned int nr)
1463 {
1464         if (nr > vc->vc_rows - vc->vc_y)
1465                 nr = vc->vc_rows - vc->vc_y;
1466         else if (!nr)
1467                 nr=1;
1468         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1469         vc->vc_need_wrap = 0;
1470 }
1471
1472 /* console_sem is held (except via vc_init->reset_terminal */
1473 static void save_cur(struct vc_data *vc)
1474 {
1475         vc->vc_saved_x          = vc->vc_x;
1476         vc->vc_saved_y          = vc->vc_y;
1477         vc->vc_s_intensity      = vc->vc_intensity;
1478         vc->vc_s_italic         = vc->vc_italic;
1479         vc->vc_s_underline      = vc->vc_underline;
1480         vc->vc_s_blink          = vc->vc_blink;
1481         vc->vc_s_reverse        = vc->vc_reverse;
1482         vc->vc_s_charset        = vc->vc_charset;
1483         vc->vc_s_color          = vc->vc_color;
1484         vc->vc_saved_G0         = vc->vc_G0_charset;
1485         vc->vc_saved_G1         = vc->vc_G1_charset;
1486 }
1487
1488 /* console_sem is held */
1489 static void restore_cur(struct vc_data *vc)
1490 {
1491         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1492         vc->vc_intensity        = vc->vc_s_intensity;
1493         vc->vc_italic           = vc->vc_s_italic;
1494         vc->vc_underline        = vc->vc_s_underline;
1495         vc->vc_blink            = vc->vc_s_blink;
1496         vc->vc_reverse          = vc->vc_s_reverse;
1497         vc->vc_charset          = vc->vc_s_charset;
1498         vc->vc_color            = vc->vc_s_color;
1499         vc->vc_G0_charset       = vc->vc_saved_G0;
1500         vc->vc_G1_charset       = vc->vc_saved_G1;
1501         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1502         update_attr(vc);
1503         vc->vc_need_wrap = 0;
1504 }
1505
1506 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1507         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1508         ESpalette };
1509
1510 /* console_sem is held (except via vc_init()) */
1511 static void reset_terminal(struct vc_data *vc, int do_clear)
1512 {
1513         vc->vc_top              = 0;
1514         vc->vc_bottom           = vc->vc_rows;
1515         vc->vc_state            = ESnormal;
1516         vc->vc_ques             = 0;
1517         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1518         vc->vc_G0_charset       = LAT1_MAP;
1519         vc->vc_G1_charset       = GRAF_MAP;
1520         vc->vc_charset          = 0;
1521         vc->vc_need_wrap        = 0;
1522         vc->vc_report_mouse     = 0;
1523         vc->vc_utf              = default_utf8;
1524         vc->vc_utf_count        = 0;
1525
1526         vc->vc_disp_ctrl        = 0;
1527         vc->vc_toggle_meta      = 0;
1528
1529         vc->vc_decscnm          = 0;
1530         vc->vc_decom            = 0;
1531         vc->vc_decawm           = 1;
1532         vc->vc_deccm            = 1;
1533         vc->vc_decim            = 0;
1534
1535         set_kbd(vc, decarm);
1536         clr_kbd(vc, decckm);
1537         clr_kbd(vc, kbdapplic);
1538         clr_kbd(vc, lnm);
1539         kbd_table[vc->vc_num].lockstate = 0;
1540         kbd_table[vc->vc_num].slockstate = 0;
1541         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1542         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1543         /* do not do set_leds here because this causes an endless tasklet loop
1544            when the keyboard hasn't been initialized yet */
1545
1546         vc->vc_cursor_type = CUR_DEFAULT;
1547         vc->vc_complement_mask = vc->vc_s_complement_mask;
1548
1549         default_attr(vc);
1550         update_attr(vc);
1551
1552         vc->vc_tab_stop[0]      = 0x01010100;
1553         vc->vc_tab_stop[1]      =
1554         vc->vc_tab_stop[2]      =
1555         vc->vc_tab_stop[3]      =
1556         vc->vc_tab_stop[4]      = 0x01010101;
1557
1558         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1559         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1560
1561         gotoxy(vc, 0, 0);
1562         save_cur(vc);
1563         if (do_clear)
1564             csi_J(vc, 2);
1565 }
1566
1567 /* console_sem is held */
1568 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1569 {
1570         /*
1571          *  Control characters can be used in the _middle_
1572          *  of an escape sequence.
1573          */
1574         switch (c) {
1575         case 0:
1576                 return;
1577         case 7:
1578                 if (vc->vc_bell_duration)
1579                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1580                 return;
1581         case 8:
1582                 bs(vc);
1583                 return;
1584         case 9:
1585                 vc->vc_pos -= (vc->vc_x << 1);
1586                 while (vc->vc_x < vc->vc_cols - 1) {
1587                         vc->vc_x++;
1588                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1589                                 break;
1590                 }
1591                 vc->vc_pos += (vc->vc_x << 1);
1592                 return;
1593         case 10: case 11: case 12:
1594                 lf(vc);
1595                 if (!is_kbd(vc, lnm))
1596                         return;
1597         case 13:
1598                 cr(vc);
1599                 return;
1600         case 14:
1601                 vc->vc_charset = 1;
1602                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1603                 vc->vc_disp_ctrl = 1;
1604                 return;
1605         case 15:
1606                 vc->vc_charset = 0;
1607                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1608                 vc->vc_disp_ctrl = 0;
1609                 return;
1610         case 24: case 26:
1611                 vc->vc_state = ESnormal;
1612                 return;
1613         case 27:
1614                 vc->vc_state = ESesc;
1615                 return;
1616         case 127:
1617                 del(vc);
1618                 return;
1619         case 128+27:
1620                 vc->vc_state = ESsquare;
1621                 return;
1622         }
1623         switch(vc->vc_state) {
1624         case ESesc:
1625                 vc->vc_state = ESnormal;
1626                 switch (c) {
1627                 case '[':
1628                         vc->vc_state = ESsquare;
1629                         return;
1630                 case ']':
1631                         vc->vc_state = ESnonstd;
1632                         return;
1633                 case '%':
1634                         vc->vc_state = ESpercent;
1635                         return;
1636                 case 'E':
1637                         cr(vc);
1638                         lf(vc);
1639                         return;
1640                 case 'M':
1641                         ri(vc);
1642                         return;
1643                 case 'D':
1644                         lf(vc);
1645                         return;
1646                 case 'H':
1647                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1648                         return;
1649                 case 'Z':
1650                         respond_ID(tty);
1651                         return;
1652                 case '7':
1653                         save_cur(vc);
1654                         return;
1655                 case '8':
1656                         restore_cur(vc);
1657                         return;
1658                 case '(':
1659                         vc->vc_state = ESsetG0;
1660                         return;
1661                 case ')':
1662                         vc->vc_state = ESsetG1;
1663                         return;
1664                 case '#':
1665                         vc->vc_state = EShash;
1666                         return;
1667                 case 'c':
1668                         reset_terminal(vc, 1);
1669                         return;
1670                 case '>':  /* Numeric keypad */
1671                         clr_kbd(vc, kbdapplic);
1672                         return;
1673                 case '=':  /* Appl. keypad */
1674                         set_kbd(vc, kbdapplic);
1675                         return;
1676                 }
1677                 return;
1678         case ESnonstd:
1679                 if (c=='P') {   /* palette escape sequence */
1680                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1681                                 vc->vc_par[vc->vc_npar] = 0;
1682                         vc->vc_npar = 0;
1683                         vc->vc_state = ESpalette;
1684                         return;
1685                 } else if (c=='R') {   /* reset palette */
1686                         reset_palette(vc);
1687                         vc->vc_state = ESnormal;
1688                 } else
1689                         vc->vc_state = ESnormal;
1690                 return;
1691         case ESpalette:
1692                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1693                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1694                         if (vc->vc_npar == 7) {
1695                                 int i = vc->vc_par[0] * 3, j = 1;
1696                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1697                                 vc->vc_palette[i++] += vc->vc_par[j++];
1698                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1699                                 vc->vc_palette[i++] += vc->vc_par[j++];
1700                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1701                                 vc->vc_palette[i] += vc->vc_par[j];
1702                                 set_palette(vc);
1703                                 vc->vc_state = ESnormal;
1704                         }
1705                 } else
1706                         vc->vc_state = ESnormal;
1707                 return;
1708         case ESsquare:
1709                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1710                         vc->vc_par[vc->vc_npar] = 0;
1711                 vc->vc_npar = 0;
1712                 vc->vc_state = ESgetpars;
1713                 if (c == '[') { /* Function key */
1714                         vc->vc_state=ESfunckey;
1715                         return;
1716                 }
1717                 vc->vc_ques = (c == '?');
1718                 if (vc->vc_ques)
1719                         return;
1720         case ESgetpars:
1721                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1722                         vc->vc_npar++;
1723                         return;
1724                 } else if (c>='0' && c<='9') {
1725                         vc->vc_par[vc->vc_npar] *= 10;
1726                         vc->vc_par[vc->vc_npar] += c - '0';
1727                         return;
1728                 } else
1729                         vc->vc_state = ESgotpars;
1730         case ESgotpars:
1731                 vc->vc_state = ESnormal;
1732                 switch(c) {
1733                 case 'h':
1734                         set_mode(vc, 1);
1735                         return;
1736                 case 'l':
1737                         set_mode(vc, 0);
1738                         return;
1739                 case 'c':
1740                         if (vc->vc_ques) {
1741                                 if (vc->vc_par[0])
1742                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1743                                 else
1744                                         vc->vc_cursor_type = CUR_DEFAULT;
1745                                 return;
1746                         }
1747                         break;
1748                 case 'm':
1749                         if (vc->vc_ques) {
1750                                 clear_selection();
1751                                 if (vc->vc_par[0])
1752                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1753                                 else
1754                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1755                                 return;
1756                         }
1757                         break;
1758                 case 'n':
1759                         if (!vc->vc_ques) {
1760                                 if (vc->vc_par[0] == 5)
1761                                         status_report(tty);
1762                                 else if (vc->vc_par[0] == 6)
1763                                         cursor_report(vc, tty);
1764                         }
1765                         return;
1766                 }
1767                 if (vc->vc_ques) {
1768                         vc->vc_ques = 0;
1769                         return;
1770                 }
1771                 switch(c) {
1772                 case 'G': case '`':
1773                         if (vc->vc_par[0])
1774                                 vc->vc_par[0]--;
1775                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1776                         return;
1777                 case 'A':
1778                         if (!vc->vc_par[0])
1779                                 vc->vc_par[0]++;
1780                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1781                         return;
1782                 case 'B': case 'e':
1783                         if (!vc->vc_par[0])
1784                                 vc->vc_par[0]++;
1785                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1786                         return;
1787                 case 'C': case 'a':
1788                         if (!vc->vc_par[0])
1789                                 vc->vc_par[0]++;
1790                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1791                         return;
1792                 case 'D':
1793                         if (!vc->vc_par[0])
1794                                 vc->vc_par[0]++;
1795                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1796                         return;
1797                 case 'E':
1798                         if (!vc->vc_par[0])
1799                                 vc->vc_par[0]++;
1800                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1801                         return;
1802                 case 'F':
1803                         if (!vc->vc_par[0])
1804                                 vc->vc_par[0]++;
1805                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1806                         return;
1807                 case 'd':
1808                         if (vc->vc_par[0])
1809                                 vc->vc_par[0]--;
1810                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1811                         return;
1812                 case 'H': case 'f':
1813                         if (vc->vc_par[0])
1814                                 vc->vc_par[0]--;
1815                         if (vc->vc_par[1])
1816                                 vc->vc_par[1]--;
1817                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1818                         return;
1819                 case 'J':
1820                         csi_J(vc, vc->vc_par[0]);
1821                         return;
1822                 case 'K':
1823                         csi_K(vc, vc->vc_par[0]);
1824                         return;
1825                 case 'L':
1826                         csi_L(vc, vc->vc_par[0]);
1827                         return;
1828                 case 'M':
1829                         csi_M(vc, vc->vc_par[0]);
1830                         return;
1831                 case 'P':
1832                         csi_P(vc, vc->vc_par[0]);
1833                         return;
1834                 case 'c':
1835                         if (!vc->vc_par[0])
1836                                 respond_ID(tty);
1837                         return;
1838                 case 'g':
1839                         if (!vc->vc_par[0])
1840                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1841                         else if (vc->vc_par[0] == 3) {
1842                                 vc->vc_tab_stop[0] =
1843                                         vc->vc_tab_stop[1] =
1844                                         vc->vc_tab_stop[2] =
1845                                         vc->vc_tab_stop[3] =
1846                                         vc->vc_tab_stop[4] = 0;
1847                         }
1848                         return;
1849                 case 'm':
1850                         csi_m(vc);
1851                         return;
1852                 case 'q': /* DECLL - but only 3 leds */
1853                         /* map 0,1,2,3 to 0,1,2,4 */
1854                         if (vc->vc_par[0] < 4)
1855                                 setledstate(kbd_table + vc->vc_num,
1856                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1857                         return;
1858                 case 'r':
1859                         if (!vc->vc_par[0])
1860                                 vc->vc_par[0]++;
1861                         if (!vc->vc_par[1])
1862                                 vc->vc_par[1] = vc->vc_rows;
1863                         /* Minimum allowed region is 2 lines */
1864                         if (vc->vc_par[0] < vc->vc_par[1] &&
1865                             vc->vc_par[1] <= vc->vc_rows) {
1866                                 vc->vc_top = vc->vc_par[0] - 1;
1867                                 vc->vc_bottom = vc->vc_par[1];
1868                                 gotoxay(vc, 0, 0);
1869                         }
1870                         return;
1871                 case 's':
1872                         save_cur(vc);
1873                         return;
1874                 case 'u':
1875                         restore_cur(vc);
1876                         return;
1877                 case 'X':
1878                         csi_X(vc, vc->vc_par[0]);
1879                         return;
1880                 case '@':
1881                         csi_at(vc, vc->vc_par[0]);
1882                         return;
1883                 case ']': /* setterm functions */
1884                         setterm_command(vc);
1885                         return;
1886                 }
1887                 return;
1888         case ESpercent:
1889                 vc->vc_state = ESnormal;
1890                 switch (c) {
1891                 case '@':  /* defined in ISO 2022 */
1892                         vc->vc_utf = 0;
1893                         return;
1894                 case 'G':  /* prelim official escape code */
1895                 case '8':  /* retained for compatibility */
1896                         vc->vc_utf = 1;
1897                         return;
1898                 }
1899                 return;
1900         case ESfunckey:
1901                 vc->vc_state = ESnormal;
1902                 return;
1903         case EShash:
1904                 vc->vc_state = ESnormal;
1905                 if (c == '8') {
1906                         /* DEC screen alignment test. kludge :-) */
1907                         vc->vc_video_erase_char =
1908                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1909                         csi_J(vc, 2);
1910                         vc->vc_video_erase_char =
1911                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1912                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1913                 }
1914                 return;
1915         case ESsetG0:
1916                 if (c == '0')
1917                         vc->vc_G0_charset = GRAF_MAP;
1918                 else if (c == 'B')
1919                         vc->vc_G0_charset = LAT1_MAP;
1920                 else if (c == 'U')
1921                         vc->vc_G0_charset = IBMPC_MAP;
1922                 else if (c == 'K')
1923                         vc->vc_G0_charset = USER_MAP;
1924                 if (vc->vc_charset == 0)
1925                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1926                 vc->vc_state = ESnormal;
1927                 return;
1928         case ESsetG1:
1929                 if (c == '0')
1930                         vc->vc_G1_charset = GRAF_MAP;
1931                 else if (c == 'B')
1932                         vc->vc_G1_charset = LAT1_MAP;
1933                 else if (c == 'U')
1934                         vc->vc_G1_charset = IBMPC_MAP;
1935                 else if (c == 'K')
1936                         vc->vc_G1_charset = USER_MAP;
1937                 if (vc->vc_charset == 1)
1938                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1939                 vc->vc_state = ESnormal;
1940                 return;
1941         default:
1942                 vc->vc_state = ESnormal;
1943         }
1944 }
1945
1946 /* This is a temporary buffer used to prepare a tty console write
1947  * so that we can easily avoid touching user space while holding the
1948  * console spinlock.  It is allocated in con_init and is shared by
1949  * this code and the vc_screen read/write tty calls.
1950  *
1951  * We have to allocate this statically in the kernel data section
1952  * since console_init (and thus con_init) are called before any
1953  * kernel memory allocation is available.
1954  */
1955 char con_buf[CON_BUF_SIZE];
1956 DEFINE_MUTEX(con_buf_mtx);
1957
1958 /* is_double_width() is based on the wcwidth() implementation by
1959  * Markus Kuhn -- 2003-05-20 (Unicode 4.0)
1960  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
1961  */
1962 struct interval {
1963         uint32_t first;
1964         uint32_t last;
1965 };
1966
1967 static int bisearch(uint32_t ucs, const struct interval *table, int max)
1968 {
1969         int min = 0;
1970         int mid;
1971
1972         if (ucs < table[0].first || ucs > table[max].last)
1973                 return 0;
1974         while (max >= min) {
1975                 mid = (min + max) / 2;
1976                 if (ucs > table[mid].last)
1977                         min = mid + 1;
1978                 else if (ucs < table[mid].first)
1979                         max = mid - 1;
1980                 else
1981                         return 1;
1982         }
1983         return 0;
1984 }
1985
1986 static int is_double_width(uint32_t ucs)
1987 {
1988         static const struct interval double_width[] = {
1989                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
1990                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1991                 { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 }, { 0xFFE0, 0xFFE6 },
1992                 { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
1993         };
1994         return bisearch(ucs, double_width,
1995                 sizeof(double_width) / sizeof(*double_width) - 1);
1996 }
1997
1998 /* acquires console_sem */
1999 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2000 {
2001 #ifdef VT_BUF_VRAM_ONLY
2002 #define FLUSH do { } while(0);
2003 #else
2004 #define FLUSH if (draw_x >= 0) { \
2005         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2006         draw_x = -1; \
2007         }
2008 #endif
2009
2010         int c, tc, ok, n = 0, draw_x = -1;
2011         unsigned int currcons;
2012         unsigned long draw_from = 0, draw_to = 0;
2013         struct vc_data *vc;
2014         unsigned char vc_attr;
2015         uint8_t rescan;
2016         uint8_t inverse;
2017         uint8_t width;
2018         u16 himask, charmask;
2019         const unsigned char *orig_buf = NULL;
2020         int orig_count;
2021
2022         if (in_interrupt())
2023                 return count;
2024
2025         might_sleep();
2026
2027         acquire_console_sem();
2028         vc = tty->driver_data;
2029         if (vc == NULL) {
2030                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2031                 release_console_sem();
2032                 return 0;
2033         }
2034
2035         currcons = vc->vc_num;
2036         if (!vc_cons_allocated(currcons)) {
2037             /* could this happen? */
2038             static int error = 0;
2039             if (!error) {
2040                 error = 1;
2041                 printk("con_write: tty %d not allocated\n", currcons+1);
2042             }
2043             release_console_sem();
2044             return 0;
2045         }
2046         release_console_sem();
2047
2048         orig_buf = buf;
2049         orig_count = count;
2050
2051         /* At this point 'buf' is guaranteed to be a kernel buffer
2052          * and therefore no access to userspace (and therefore sleeping)
2053          * will be needed.  The con_buf_mtx serializes all tty based
2054          * console rendering and vcs write/read operations.  We hold
2055          * the console spinlock during the entire write.
2056          */
2057
2058         acquire_console_sem();
2059
2060         vc = tty->driver_data;
2061         if (vc == NULL) {
2062                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2063                 release_console_sem();
2064                 goto out;
2065         }
2066
2067         himask = vc->vc_hi_font_mask;
2068         charmask = himask ? 0x1ff : 0xff;
2069
2070         /* undraw cursor first */
2071         if (IS_FG(vc))
2072                 hide_cursor(vc);
2073
2074         while (!tty->stopped && count) {
2075                 int orig = *buf;
2076                 c = orig;
2077                 buf++;
2078                 n++;
2079                 count--;
2080                 rescan = 0;
2081                 inverse = 0;
2082                 width = 1;
2083
2084                 /* Do no translation at all in control states */
2085                 if (vc->vc_state != ESnormal) {
2086                         tc = c;
2087                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2088                     /* Combine UTF-8 into Unicode in vc_utf_char.
2089                      * vc_utf_count is the number of continuation bytes still
2090                      * expected to arrive.
2091                      * vc_npar is the number of continuation bytes arrived so
2092                      * far
2093                      */
2094 rescan_last_byte:
2095                     if ((c & 0xc0) == 0x80) {
2096                         /* Continuation byte received */
2097                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2098                         if (vc->vc_utf_count) {
2099                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2100                             vc->vc_npar++;
2101                             if (--vc->vc_utf_count) {
2102                                 /* Still need some bytes */
2103                                 continue;
2104                             }
2105                             /* Got a whole character */
2106                             c = vc->vc_utf_char;
2107                             /* Reject overlong sequences */
2108                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2109                                         c > utf8_length_changes[vc->vc_npar])
2110                                 c = 0xfffd;
2111                         } else {
2112                             /* Unexpected continuation byte */
2113                             vc->vc_utf_count = 0;
2114                             c = 0xfffd;
2115                         }
2116                     } else {
2117                         /* Single ASCII byte or first byte of a sequence received */
2118                         if (vc->vc_utf_count) {
2119                             /* Continuation byte expected */
2120                             rescan = 1;
2121                             vc->vc_utf_count = 0;
2122                             c = 0xfffd;
2123                         } else if (c > 0x7f) {
2124                             /* First byte of a multibyte sequence received */
2125                             vc->vc_npar = 0;
2126                             if ((c & 0xe0) == 0xc0) {
2127                                 vc->vc_utf_count = 1;
2128                                 vc->vc_utf_char = (c & 0x1f);
2129                             } else if ((c & 0xf0) == 0xe0) {
2130                                 vc->vc_utf_count = 2;
2131                                 vc->vc_utf_char = (c & 0x0f);
2132                             } else if ((c & 0xf8) == 0xf0) {
2133                                 vc->vc_utf_count = 3;
2134                                 vc->vc_utf_char = (c & 0x07);
2135                             } else if ((c & 0xfc) == 0xf8) {
2136                                 vc->vc_utf_count = 4;
2137                                 vc->vc_utf_char = (c & 0x03);
2138                             } else if ((c & 0xfe) == 0xfc) {
2139                                 vc->vc_utf_count = 5;
2140                                 vc->vc_utf_char = (c & 0x01);
2141                             } else {
2142                                 /* 254 and 255 are invalid */
2143                                 c = 0xfffd;
2144                             }
2145                             if (vc->vc_utf_count) {
2146                                 /* Still need some bytes */
2147                                 continue;
2148                             }
2149                         }
2150                         /* Nothing to do if an ASCII byte was received */
2151                     }
2152                     /* End of UTF-8 decoding. */
2153                     /* c is the received character, or U+FFFD for invalid sequences. */
2154                     /* Replace invalid Unicode code points with U+FFFD too */
2155                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2156                         c = 0xfffd;
2157                     tc = c;
2158                 } else {        /* no utf or alternate charset mode */
2159                     tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2160                 }
2161
2162                 /* If the original code was a control character we
2163                  * only allow a glyph to be displayed if the code is
2164                  * not normally used (such as for cursor movement) or
2165                  * if the disp_ctrl mode has been explicitly enabled.
2166                  * Certain characters (as given by the CTRL_ALWAYS
2167                  * bitmap) are always displayed as control characters,
2168                  * as the console would be pretty useless without
2169                  * them; to display an arbitrary font position use the
2170                  * direct-to-font zone in UTF-8 mode.
2171                  */
2172                 ok = tc && (c >= 32 ||
2173                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2174                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2175                         && (c != 127 || vc->vc_disp_ctrl)
2176                         && (c != 128+27);
2177
2178                 if (vc->vc_state == ESnormal && ok) {
2179                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2180                                 if (is_double_width(c))
2181                                         width = 2;
2182                         }
2183                         /* Now try to find out how to display it */
2184                         tc = conv_uni_to_pc(vc, tc);
2185                         if (tc & ~charmask) {
2186                                 if (tc == -1 || tc == -2) {
2187                                     continue; /* nothing to display */
2188                                 }
2189                                 /* Glyph not found */
2190                                 if (!(vc->vc_utf && !vc->vc_disp_ctrl) && !(c & ~charmask)) {
2191                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2192                                        This would make absolutely no sense with Unicode in mind. */
2193                                     tc = c;
2194                                 } else {
2195                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2196                                     tc = conv_uni_to_pc(vc, 0xfffd);
2197                                     if (tc < 0) {
2198                                         inverse = 1;
2199                                         tc = conv_uni_to_pc(vc, '?');
2200                                         if (tc < 0) tc = '?';
2201                                     }
2202                                 }
2203                         }
2204
2205                         if (!inverse) {
2206                                 vc_attr = vc->vc_attr;
2207                         } else {
2208                                 /* invert vc_attr */
2209                                 if (!vc->vc_can_do_color) {
2210                                         vc_attr = (vc->vc_attr) ^ 0x08;
2211                                 } else if (vc->vc_hi_font_mask == 0x100) {
2212                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2213                                 } else {
2214                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2215                                 }
2216                         }
2217
2218                         while (1) {
2219                                 if (vc->vc_need_wrap || vc->vc_decim)
2220                                         FLUSH
2221                                 if (vc->vc_need_wrap) {
2222                                         cr(vc);
2223                                         lf(vc);
2224                                 }
2225                                 if (vc->vc_decim)
2226                                         insert_char(vc, 1);
2227                                 scr_writew(himask ?
2228                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2229                                              (vc_attr << 8) + tc,
2230                                            (u16 *) vc->vc_pos);
2231                                 if (DO_UPDATE(vc) && draw_x < 0) {
2232                                         draw_x = vc->vc_x;
2233                                         draw_from = vc->vc_pos;
2234                                 }
2235                                 if (vc->vc_x == vc->vc_cols - 1) {
2236                                         vc->vc_need_wrap = vc->vc_decawm;
2237                                         draw_to = vc->vc_pos + 2;
2238                                 } else {
2239                                         vc->vc_x++;
2240                                         draw_to = (vc->vc_pos += 2);
2241                                 }
2242
2243                                 if (!--width) break;
2244
2245                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2246                                 if (tc < 0) tc = ' ';
2247                         }
2248
2249                         if (rescan) {
2250                                 rescan = 0;
2251                                 inverse = 0;
2252                                 width = 1;
2253                                 c = orig;
2254                                 goto rescan_last_byte;
2255                         }
2256                         continue;
2257                 }
2258                 FLUSH
2259                 do_con_trol(tty, vc, orig);
2260         }
2261         FLUSH
2262         console_conditional_schedule();
2263         release_console_sem();
2264
2265 out:
2266         return n;
2267 #undef FLUSH
2268 }
2269
2270 /*
2271  * This is the console switching callback.
2272  *
2273  * Doing console switching in a process context allows
2274  * us to do the switches asynchronously (needed when we want
2275  * to switch due to a keyboard interrupt).  Synchronization
2276  * with other console code and prevention of re-entrancy is
2277  * ensured with console_sem.
2278  */
2279 static void console_callback(struct work_struct *ignored)
2280 {
2281         acquire_console_sem();
2282
2283         if (want_console >= 0) {
2284                 if (want_console != fg_console &&
2285                     vc_cons_allocated(want_console)) {
2286                         hide_cursor(vc_cons[fg_console].d);
2287                         change_console(vc_cons[want_console].d);
2288                         /* we only changed when the console had already
2289                            been allocated - a new console is not created
2290                            in an interrupt routine */
2291                 }
2292                 want_console = -1;
2293         }
2294         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2295                 do_poke_blanked_console = 0;
2296                 poke_blanked_console();
2297         }
2298         if (scrollback_delta) {
2299                 struct vc_data *vc = vc_cons[fg_console].d;
2300                 clear_selection();
2301                 if (vc->vc_mode == KD_TEXT)
2302                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2303                 scrollback_delta = 0;
2304         }
2305         if (blank_timer_expired) {
2306                 do_blank_screen(0);
2307                 blank_timer_expired = 0;
2308         }
2309
2310         release_console_sem();
2311 }
2312
2313 int set_console(int nr)
2314 {
2315         struct vc_data *vc = vc_cons[fg_console].d;
2316
2317         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2318                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2319
2320                 /*
2321                  * Console switch will fail in console_callback() or
2322                  * change_console() so there is no point scheduling
2323                  * the callback
2324                  *
2325                  * Existing set_console() users don't check the return
2326                  * value so this shouldn't break anything
2327                  */
2328                 return -EINVAL;
2329         }
2330
2331         want_console = nr;
2332         schedule_console_callback();
2333
2334         return 0;
2335 }
2336
2337 struct tty_driver *console_driver;
2338
2339 #ifdef CONFIG_VT_CONSOLE
2340
2341 /*
2342  *      Console on virtual terminal
2343  *
2344  * The console must be locked when we get here.
2345  */
2346
2347 static void vt_console_print(struct console *co, const char *b, unsigned count)
2348 {
2349         struct vc_data *vc = vc_cons[fg_console].d;
2350         unsigned char c;
2351         static unsigned long printing;
2352         const ushort *start;
2353         ushort cnt = 0;
2354         ushort myx;
2355
2356         /* console busy or not yet initialized */
2357         if (!printable || test_and_set_bit(0, &printing))
2358                 return;
2359
2360         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2361                 vc = vc_cons[kmsg_redirect - 1].d;
2362
2363         /* read `x' only after setting currcons properly (otherwise
2364            the `x' macro will read the x of the foreground console). */
2365         myx = vc->vc_x;
2366
2367         if (!vc_cons_allocated(fg_console)) {
2368                 /* impossible */
2369                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2370                 goto quit;
2371         }
2372
2373         if (vc->vc_mode != KD_TEXT)
2374                 goto quit;
2375
2376         /* undraw cursor first */
2377         if (IS_FG(vc))
2378                 hide_cursor(vc);
2379
2380         start = (ushort *)vc->vc_pos;
2381
2382         /* Contrived structure to try to emulate original need_wrap behaviour
2383          * Problems caused when we have need_wrap set on '\n' character */
2384         while (count--) {
2385                 c = *b++;
2386                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2387                         if (cnt > 0) {
2388                                 if (CON_IS_VISIBLE(vc))
2389                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2390                                 vc->vc_x += cnt;
2391                                 if (vc->vc_need_wrap)
2392                                         vc->vc_x--;
2393                                 cnt = 0;
2394                         }
2395                         if (c == 8) {           /* backspace */
2396                                 bs(vc);
2397                                 start = (ushort *)vc->vc_pos;
2398                                 myx = vc->vc_x;
2399                                 continue;
2400                         }
2401                         if (c != 13)
2402                                 lf(vc);
2403                         cr(vc);
2404                         start = (ushort *)vc->vc_pos;
2405                         myx = vc->vc_x;
2406                         if (c == 10 || c == 13)
2407                                 continue;
2408                 }
2409                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2410                 cnt++;
2411                 if (myx == vc->vc_cols - 1) {
2412                         vc->vc_need_wrap = 1;
2413                         continue;
2414                 }
2415                 vc->vc_pos += 2;
2416                 myx++;
2417         }
2418         if (cnt > 0) {
2419                 if (CON_IS_VISIBLE(vc))
2420                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2421                 vc->vc_x += cnt;
2422                 if (vc->vc_x == vc->vc_cols) {
2423                         vc->vc_x--;
2424                         vc->vc_need_wrap = 1;
2425                 }
2426         }
2427         set_cursor(vc);
2428
2429 quit:
2430         clear_bit(0, &printing);
2431 }
2432
2433 static struct tty_driver *vt_console_device(struct console *c, int *index)
2434 {
2435         *index = c->index ? c->index-1 : fg_console;
2436         return console_driver;
2437 }
2438
2439 static struct console vt_console_driver = {
2440         .name           = "tty",
2441         .write          = vt_console_print,
2442         .device         = vt_console_device,
2443         .unblank        = unblank_screen,
2444         .flags          = CON_PRINTBUFFER,
2445         .index          = -1,
2446 };
2447 #endif
2448
2449 /*
2450  *      Handling of Linux-specific VC ioctls
2451  */
2452
2453 /*
2454  * Generally a bit racy with respect to console_sem().
2455  *
2456  * There are some functions which don't need it.
2457  *
2458  * There are some functions which can sleep for arbitrary periods
2459  * (paste_selection) but we don't need the lock there anyway.
2460  *
2461  * set_selection has locking, and definitely needs it
2462  */
2463
2464 int tioclinux(struct tty_struct *tty, unsigned long arg)
2465 {
2466         char type, data;
2467         char __user *p = (char __user *)arg;
2468         int lines;
2469         int ret;
2470
2471         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2472                 return -EINVAL;
2473         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2474                 return -EPERM;
2475         if (get_user(type, p))
2476                 return -EFAULT;
2477         ret = 0;
2478         switch (type)
2479         {
2480                 case TIOCL_SETSEL:
2481                         acquire_console_sem();
2482                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2483                         release_console_sem();
2484                         break;
2485                 case TIOCL_PASTESEL:
2486                         ret = paste_selection(tty);
2487                         break;
2488                 case TIOCL_UNBLANKSCREEN:
2489                         acquire_console_sem();
2490                         unblank_screen();
2491                         release_console_sem();
2492                         break;
2493                 case TIOCL_SELLOADLUT:
2494                         ret = sel_loadlut(p);
2495                         break;
2496                 case TIOCL_GETSHIFTSTATE:
2497                         
2498         /*
2499          * Make it possible to react to Shift+Mousebutton.
2500          * Note that 'shift_state' is an undocumented
2501          * kernel-internal variable; programs not closely
2502          * related to the kernel should not use this.
2503          */
2504                         data = shift_state;
2505                         ret = __put_user(data, p);
2506                         break;
2507                 case TIOCL_GETMOUSEREPORTING:
2508                         data = mouse_reporting();
2509                         ret = __put_user(data, p);
2510                         break;
2511                 case TIOCL_SETVESABLANK:
2512                         ret = set_vesa_blanking(p);
2513                         break;
2514                 case TIOCL_GETKMSGREDIRECT:
2515                         data = kmsg_redirect;
2516                         ret = __put_user(data, p);
2517                         break;
2518                 case TIOCL_SETKMSGREDIRECT:
2519                         if (!capable(CAP_SYS_ADMIN)) {
2520                                 ret = -EPERM;
2521                         } else {
2522                                 if (get_user(data, p+1))
2523                                         ret = -EFAULT;
2524                                 else
2525                                         kmsg_redirect = data;
2526                         }
2527                         break;
2528                 case TIOCL_GETFGCONSOLE:
2529                         ret = fg_console;
2530                         break;
2531                 case TIOCL_SCROLLCONSOLE:
2532                         if (get_user(lines, (s32 __user *)(p+4))) {
2533                                 ret = -EFAULT;
2534                         } else {
2535                                 scrollfront(vc_cons[fg_console].d, lines);
2536                                 ret = 0;
2537                         }
2538                         break;
2539                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2540                         acquire_console_sem();
2541                         ignore_poke = 1;
2542                         do_blank_screen(0);
2543                         release_console_sem();
2544                         break;
2545                 case TIOCL_BLANKEDSCREEN:
2546                         ret = console_blanked;
2547                         break;
2548                 default:
2549                         ret = -EINVAL;
2550                         break;
2551         }
2552         return ret;
2553 }
2554
2555 /*
2556  * /dev/ttyN handling
2557  */
2558
2559 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2560 {
2561         int     retval;
2562
2563         retval = do_con_write(tty, buf, count);
2564         con_flush_chars(tty);
2565
2566         return retval;
2567 }
2568
2569 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2570 {
2571         if (in_interrupt())
2572                 return; /* n_r3964 calls put_char() from interrupt context */
2573         do_con_write(tty, &ch, 1);
2574 }
2575
2576 static int con_write_room(struct tty_struct *tty)
2577 {
2578         if (tty->stopped)
2579                 return 0;
2580         return 4096;            /* No limit, really; we're not buffering */
2581 }
2582
2583 static int con_chars_in_buffer(struct tty_struct *tty)
2584 {
2585         return 0;               /* we're not buffering */
2586 }
2587
2588 /*
2589  * con_throttle and con_unthrottle are only used for
2590  * paste_selection(), which has to stuff in a large number of
2591  * characters...
2592  */
2593 static void con_throttle(struct tty_struct *tty)
2594 {
2595 }
2596
2597 static void con_unthrottle(struct tty_struct *tty)
2598 {
2599         struct vc_data *vc = tty->driver_data;
2600
2601         wake_up_interruptible(&vc->paste_wait);
2602 }
2603
2604 /*
2605  * Turn the Scroll-Lock LED on when the tty is stopped
2606  */
2607 static void con_stop(struct tty_struct *tty)
2608 {
2609         int console_num;
2610         if (!tty)
2611                 return;
2612         console_num = tty->index;
2613         if (!vc_cons_allocated(console_num))
2614                 return;
2615         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2616         set_leds();
2617 }
2618
2619 /*
2620  * Turn the Scroll-Lock LED off when the console is started
2621  */
2622 static void con_start(struct tty_struct *tty)
2623 {
2624         int console_num;
2625         if (!tty)
2626                 return;
2627         console_num = tty->index;
2628         if (!vc_cons_allocated(console_num))
2629                 return;
2630         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2631         set_leds();
2632 }
2633
2634 static void con_flush_chars(struct tty_struct *tty)
2635 {
2636         struct vc_data *vc;
2637
2638         if (in_interrupt())     /* from flush_to_ldisc */
2639                 return;
2640
2641         /* if we race with con_close(), vt may be null */
2642         acquire_console_sem();
2643         vc = tty->driver_data;
2644         if (vc)
2645                 set_cursor(vc);
2646         release_console_sem();
2647 }
2648
2649 /*
2650  * Allocate the console screen memory.
2651  */
2652 static int con_open(struct tty_struct *tty, struct file *filp)
2653 {
2654         unsigned int currcons = tty->index;
2655         int ret = 0;
2656
2657         acquire_console_sem();
2658         if (tty->driver_data == NULL) {
2659                 ret = vc_allocate(currcons);
2660                 if (ret == 0) {
2661                         struct vc_data *vc = vc_cons[currcons].d;
2662                         tty->driver_data = vc;
2663                         vc->vc_tty = tty;
2664
2665                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2666                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2667                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2668                         }
2669                         release_console_sem();
2670                         vcs_make_sysfs(tty);
2671                         return ret;
2672                 }
2673         }
2674         release_console_sem();
2675         return ret;
2676 }
2677
2678 /*
2679  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2680  * and taking a ref against the tty while we're in the process of forgetting
2681  * about it and cleaning things up.
2682  *
2683  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2684  */
2685 static void con_close(struct tty_struct *tty, struct file *filp)
2686 {
2687         mutex_lock(&tty_mutex);
2688         acquire_console_sem();
2689         if (tty && tty->count == 1) {
2690                 struct vc_data *vc = tty->driver_data;
2691
2692                 if (vc)
2693                         vc->vc_tty = NULL;
2694                 tty->driver_data = NULL;
2695                 release_console_sem();
2696                 vcs_remove_sysfs(tty);
2697                 mutex_unlock(&tty_mutex);
2698                 /*
2699                  * tty_mutex is released, but we still hold BKL, so there is
2700                  * still exclusion against init_dev()
2701                  */
2702                 return;
2703         }
2704         release_console_sem();
2705         mutex_unlock(&tty_mutex);
2706 }
2707
2708 static int default_italic_color    = 2; // green (ASCII)
2709 static int default_underline_color = 3; // cyan (ASCII)
2710 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2711 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2712
2713 static void vc_init(struct vc_data *vc, unsigned int rows,
2714                     unsigned int cols, int do_clear)
2715 {
2716         int j, k ;
2717
2718         vc->vc_cols = cols;
2719         vc->vc_rows = rows;
2720         vc->vc_size_row = cols << 1;
2721         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2722
2723         set_origin(vc);
2724         vc->vc_pos = vc->vc_origin;
2725         reset_vc(vc);
2726         for (j=k=0; j<16; j++) {
2727                 vc->vc_palette[k++] = default_red[j] ;
2728                 vc->vc_palette[k++] = default_grn[j] ;
2729                 vc->vc_palette[k++] = default_blu[j] ;
2730         }
2731         vc->vc_def_color       = 0x07;   /* white */
2732         vc->vc_ulcolor         = default_underline_color;
2733         vc->vc_itcolor         = default_italic_color;
2734         vc->vc_halfcolor       = 0x08;   /* grey */
2735         init_waitqueue_head(&vc->paste_wait);
2736         reset_terminal(vc, do_clear);
2737 }
2738
2739 /*
2740  * This routine initializes console interrupts, and does nothing
2741  * else. If you want the screen to clear, call tty_write with
2742  * the appropriate escape-sequence.
2743  */
2744
2745 static int __init con_init(void)
2746 {
2747         const char *display_desc = NULL;
2748         struct vc_data *vc;
2749         unsigned int currcons = 0, i;
2750
2751         acquire_console_sem();
2752
2753         if (conswitchp)
2754                 display_desc = conswitchp->con_startup();
2755         if (!display_desc) {
2756                 fg_console = 0;
2757                 release_console_sem();
2758                 return 0;
2759         }
2760
2761         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2762                 struct con_driver *con_driver = &registered_con_driver[i];
2763
2764                 if (con_driver->con == NULL) {
2765                         con_driver->con = conswitchp;
2766                         con_driver->desc = display_desc;
2767                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2768                         con_driver->first = 0;
2769                         con_driver->last = MAX_NR_CONSOLES - 1;
2770                         break;
2771                 }
2772         }
2773
2774         for (i = 0; i < MAX_NR_CONSOLES; i++)
2775                 con_driver_map[i] = conswitchp;
2776
2777         if (blankinterval) {
2778                 blank_state = blank_normal_wait;
2779                 mod_timer(&console_timer, jiffies + blankinterval);
2780         }
2781
2782         /*
2783          * kmalloc is not running yet - we use the bootmem allocator.
2784          */
2785         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2786                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2787                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2788                 visual_init(vc, currcons, 1);
2789                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2790                 vc->vc_kmalloced = 0;
2791                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2792                         currcons || !vc->vc_sw->con_save_screen);
2793         }
2794         currcons = fg_console = 0;
2795         master_display_fg = vc = vc_cons[currcons].d;
2796         set_origin(vc);
2797         save_screen(vc);
2798         gotoxy(vc, vc->vc_x, vc->vc_y);
2799         csi_J(vc, 0);
2800         update_screen(vc);
2801         printk("Console: %s %s %dx%d",
2802                 vc->vc_can_do_color ? "colour" : "mono",
2803                 display_desc, vc->vc_cols, vc->vc_rows);
2804         printable = 1;
2805         printk("\n");
2806
2807         release_console_sem();
2808
2809 #ifdef CONFIG_VT_CONSOLE
2810         register_console(&vt_console_driver);
2811 #endif
2812         return 0;
2813 }
2814 console_initcall(con_init);
2815
2816 static const struct tty_operations con_ops = {
2817         .open = con_open,
2818         .close = con_close,
2819         .write = con_write,
2820         .write_room = con_write_room,
2821         .put_char = con_put_char,
2822         .flush_chars = con_flush_chars,
2823         .chars_in_buffer = con_chars_in_buffer,
2824         .ioctl = vt_ioctl,
2825         .stop = con_stop,
2826         .start = con_start,
2827         .throttle = con_throttle,
2828         .unthrottle = con_unthrottle,
2829 };
2830
2831 int __init vty_init(void)
2832 {
2833         vcs_init();
2834
2835         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2836         if (!console_driver)
2837                 panic("Couldn't allocate console driver\n");
2838         console_driver->owner = THIS_MODULE;
2839         console_driver->name = "tty";
2840         console_driver->name_base = 1;
2841         console_driver->major = TTY_MAJOR;
2842         console_driver->minor_start = 1;
2843         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2844         console_driver->init_termios = tty_std_termios;
2845         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2846         tty_set_operations(console_driver, &con_ops);
2847         if (tty_register_driver(console_driver))
2848                 panic("Couldn't register console driver\n");
2849
2850         kbd_init();
2851         console_map_init();
2852 #ifdef CONFIG_PROM_CONSOLE
2853         prom_con_init();
2854 #endif
2855 #ifdef CONFIG_MDA_CONSOLE
2856         mda_console_init();
2857 #endif
2858         return 0;
2859 }
2860
2861 #ifndef VT_SINGLE_DRIVER
2862 #include <linux/device.h>
2863
2864 static struct class *vtconsole_class;
2865
2866 static int bind_con_driver(const struct consw *csw, int first, int last,
2867                            int deflt)
2868 {
2869         struct module *owner = csw->owner;
2870         const char *desc = NULL;
2871         struct con_driver *con_driver;
2872         int i, j = -1, k = -1, retval = -ENODEV;
2873
2874         if (!try_module_get(owner))
2875                 return -ENODEV;
2876
2877         acquire_console_sem();
2878
2879         /* check if driver is registered */
2880         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2881                 con_driver = &registered_con_driver[i];
2882
2883                 if (con_driver->con == csw) {
2884                         desc = con_driver->desc;
2885                         retval = 0;
2886                         break;
2887                 }
2888         }
2889
2890         if (retval)
2891                 goto err;
2892
2893         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2894                 csw->con_startup();
2895                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2896         }
2897
2898         if (deflt) {
2899                 if (conswitchp)
2900                         module_put(conswitchp->owner);
2901
2902                 __module_get(owner);
2903                 conswitchp = csw;
2904         }
2905
2906         first = max(first, con_driver->first);
2907         last = min(last, con_driver->last);
2908
2909         for (i = first; i <= last; i++) {
2910                 int old_was_color;
2911                 struct vc_data *vc = vc_cons[i].d;
2912
2913                 if (con_driver_map[i])
2914                         module_put(con_driver_map[i]->owner);
2915                 __module_get(owner);
2916                 con_driver_map[i] = csw;
2917
2918                 if (!vc || !vc->vc_sw)
2919                         continue;
2920
2921                 j = i;
2922
2923                 if (CON_IS_VISIBLE(vc)) {
2924                         k = i;
2925                         save_screen(vc);
2926                 }
2927
2928                 old_was_color = vc->vc_can_do_color;
2929                 vc->vc_sw->con_deinit(vc);
2930                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2931                 visual_init(vc, i, 0);
2932                 set_origin(vc);
2933                 update_attr(vc);
2934
2935                 /* If the console changed between mono <-> color, then
2936                  * the attributes in the screenbuf will be wrong.  The
2937                  * following resets all attributes to something sane.
2938                  */
2939                 if (old_was_color != vc->vc_can_do_color)
2940                         clear_buffer_attributes(vc);
2941         }
2942
2943         printk("Console: switching ");
2944         if (!deflt)
2945                 printk("consoles %d-%d ", first+1, last+1);
2946         if (j >= 0) {
2947                 struct vc_data *vc = vc_cons[j].d;
2948
2949                 printk("to %s %s %dx%d\n",
2950                        vc->vc_can_do_color ? "colour" : "mono",
2951                        desc, vc->vc_cols, vc->vc_rows);
2952
2953                 if (k >= 0) {
2954                         vc = vc_cons[k].d;
2955                         update_screen(vc);
2956                 }
2957         } else
2958                 printk("to %s\n", desc);
2959
2960         retval = 0;
2961 err:
2962         release_console_sem();
2963         module_put(owner);
2964         return retval;
2965 };
2966
2967 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2968 static int con_is_graphics(const struct consw *csw, int first, int last)
2969 {
2970         int i, retval = 0;
2971
2972         for (i = first; i <= last; i++) {
2973                 struct vc_data *vc = vc_cons[i].d;
2974
2975                 if (vc && vc->vc_mode == KD_GRAPHICS) {
2976                         retval = 1;
2977                         break;
2978                 }
2979         }
2980
2981         return retval;
2982 }
2983
2984 static int unbind_con_driver(const struct consw *csw, int first, int last,
2985                              int deflt)
2986 {
2987         struct module *owner = csw->owner;
2988         const struct consw *defcsw = NULL;
2989         struct con_driver *con_driver = NULL, *con_back = NULL;
2990         int i, retval = -ENODEV;
2991
2992         if (!try_module_get(owner))
2993                 return -ENODEV;
2994
2995         acquire_console_sem();
2996
2997         /* check if driver is registered and if it is unbindable */
2998         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2999                 con_driver = &registered_con_driver[i];
3000
3001                 if (con_driver->con == csw &&
3002                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3003                         retval = 0;
3004                         break;
3005                 }
3006         }
3007
3008         if (retval) {
3009                 release_console_sem();
3010                 goto err;
3011         }
3012
3013         retval = -ENODEV;
3014
3015         /* check if backup driver exists */
3016         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3017                 con_back = &registered_con_driver[i];
3018
3019                 if (con_back->con &&
3020                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3021                         defcsw = con_back->con;
3022                         retval = 0;
3023                         break;
3024                 }
3025         }
3026
3027         if (retval) {
3028                 release_console_sem();
3029                 goto err;
3030         }
3031
3032         if (!con_is_bound(csw)) {
3033                 release_console_sem();
3034                 goto err;
3035         }
3036
3037         first = max(first, con_driver->first);
3038         last = min(last, con_driver->last);
3039
3040         for (i = first; i <= last; i++) {
3041                 if (con_driver_map[i] == csw) {
3042                         module_put(csw->owner);
3043                         con_driver_map[i] = NULL;
3044                 }
3045         }
3046
3047         if (!con_is_bound(defcsw)) {
3048                 const struct consw *defconsw = conswitchp;
3049
3050                 defcsw->con_startup();
3051                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3052                 /*
3053                  * vgacon may change the default driver to point
3054                  * to dummycon, we restore it here...
3055                  */
3056                 conswitchp = defconsw;
3057         }
3058
3059         if (!con_is_bound(csw))
3060                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3061
3062         release_console_sem();
3063         /* ignore return value, binding should not fail */
3064         bind_con_driver(defcsw, first, last, deflt);
3065 err:
3066         module_put(owner);
3067         return retval;
3068
3069 }
3070
3071 static int vt_bind(struct con_driver *con)
3072 {
3073         const struct consw *defcsw = NULL, *csw = NULL;
3074         int i, more = 1, first = -1, last = -1, deflt = 0;
3075
3076         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3077             con_is_graphics(con->con, con->first, con->last))
3078                 goto err;
3079
3080         csw = con->con;
3081
3082         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3083                 struct con_driver *con = &registered_con_driver[i];
3084
3085                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3086                         defcsw = con->con;
3087                         break;
3088                 }
3089         }
3090
3091         if (!defcsw)
3092                 goto err;
3093
3094         while (more) {
3095                 more = 0;
3096
3097                 for (i = con->first; i <= con->last; i++) {
3098                         if (con_driver_map[i] == defcsw) {
3099                                 if (first == -1)
3100                                         first = i;
3101                                 last = i;
3102                                 more = 1;
3103                         } else if (first != -1)
3104                                 break;
3105                 }
3106
3107                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3108                         deflt = 1;
3109
3110                 if (first != -1)
3111                         bind_con_driver(csw, first, last, deflt);
3112
3113                 first = -1;
3114                 last = -1;
3115                 deflt = 0;
3116         }
3117
3118 err:
3119         return 0;
3120 }
3121
3122 static int vt_unbind(struct con_driver *con)
3123 {
3124         const struct consw *csw = NULL;
3125         int i, more = 1, first = -1, last = -1, deflt = 0;
3126
3127         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3128             con_is_graphics(con->con, con->first, con->last))
3129                 goto err;
3130
3131         csw = con->con;
3132
3133         while (more) {
3134                 more = 0;
3135
3136                 for (i = con->first; i <= con->last; i++) {
3137                         if (con_driver_map[i] == csw) {
3138                                 if (first == -1)
3139                                         first = i;
3140                                 last = i;
3141                                 more = 1;
3142                         } else if (first != -1)
3143                                 break;
3144                 }
3145
3146                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3147                         deflt = 1;
3148
3149                 if (first != -1)
3150                         unbind_con_driver(csw, first, last, deflt);
3151
3152                 first = -1;
3153                 last = -1;
3154                 deflt = 0;
3155         }
3156
3157 err:
3158         return 0;
3159 }
3160 #else
3161 static inline int vt_bind(struct con_driver *con)
3162 {
3163         return 0;
3164 }
3165 static inline int vt_unbind(struct con_driver *con)
3166 {
3167         return 0;
3168 }
3169 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3170
3171 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3172                           const char *buf, size_t count)
3173 {
3174         struct con_driver *con = dev_get_drvdata(dev);
3175         int bind = simple_strtoul(buf, NULL, 0);
3176
3177         if (bind)
3178                 vt_bind(con);
3179         else
3180                 vt_unbind(con);
3181
3182         return count;
3183 }
3184
3185 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3186                          char *buf)
3187 {
3188         struct con_driver *con = dev_get_drvdata(dev);
3189         int bind = con_is_bound(con->con);
3190
3191         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3192 }
3193
3194 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3195                          char *buf)
3196 {
3197         struct con_driver *con = dev_get_drvdata(dev);
3198
3199         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3200                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3201                          con->desc);
3202
3203 }
3204
3205 static struct device_attribute device_attrs[] = {
3206         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3207         __ATTR(name, S_IRUGO, show_name, NULL),
3208 };
3209
3210 static int vtconsole_init_device(struct con_driver *con)
3211 {
3212         int i;
3213         int error = 0;
3214
3215         con->flag |= CON_DRIVER_FLAG_ATTR;
3216         dev_set_drvdata(con->dev, con);
3217         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3218                 error = device_create_file(con->dev, &device_attrs[i]);
3219                 if (error)
3220                         break;
3221         }
3222
3223         if (error) {
3224                 while (--i >= 0)
3225                         device_remove_file(con->dev, &device_attrs[i]);
3226                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3227         }
3228
3229         return error;
3230 }
3231
3232 static void vtconsole_deinit_device(struct con_driver *con)
3233 {
3234         int i;
3235
3236         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3237                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3238                         device_remove_file(con->dev, &device_attrs[i]);
3239                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3240         }
3241 }
3242
3243 /**
3244  * con_is_bound - checks if driver is bound to the console
3245  * @csw: console driver
3246  *
3247  * RETURNS: zero if unbound, nonzero if bound
3248  *
3249  * Drivers can call this and if zero, they should release
3250  * all resources allocated on con_startup()
3251  */
3252 int con_is_bound(const struct consw *csw)
3253 {
3254         int i, bound = 0;
3255
3256         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3257                 if (con_driver_map[i] == csw) {
3258                         bound = 1;
3259                         break;
3260                 }
3261         }
3262
3263         return bound;
3264 }
3265 EXPORT_SYMBOL(con_is_bound);
3266
3267 /**
3268  * register_con_driver - register console driver to console layer
3269  * @csw: console driver
3270  * @first: the first console to take over, minimum value is 0
3271  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3272  *
3273  * DESCRIPTION: This function registers a console driver which can later
3274  * bind to a range of consoles specified by @first and @last. It will
3275  * also initialize the console driver by calling con_startup().
3276  */
3277 int register_con_driver(const struct consw *csw, int first, int last)
3278 {
3279         struct module *owner = csw->owner;
3280         struct con_driver *con_driver;
3281         const char *desc;
3282         int i, retval = 0;
3283
3284         if (!try_module_get(owner))
3285                 return -ENODEV;
3286
3287         acquire_console_sem();
3288
3289         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3290                 con_driver = &registered_con_driver[i];
3291
3292                 /* already registered */
3293                 if (con_driver->con == csw)
3294                         retval = -EINVAL;
3295         }
3296
3297         if (retval)
3298                 goto err;
3299
3300         desc = csw->con_startup();
3301
3302         if (!desc)
3303                 goto err;
3304
3305         retval = -EINVAL;
3306
3307         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3308                 con_driver = &registered_con_driver[i];
3309
3310                 if (con_driver->con == NULL) {
3311                         con_driver->con = csw;
3312                         con_driver->desc = desc;
3313                         con_driver->node = i;
3314                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3315                                            CON_DRIVER_FLAG_INIT;
3316                         con_driver->first = first;
3317                         con_driver->last = last;
3318                         retval = 0;
3319                         break;
3320                 }
3321         }
3322
3323         if (retval)
3324                 goto err;
3325
3326         con_driver->dev = device_create(vtconsole_class, NULL,
3327                                         MKDEV(0, con_driver->node),
3328                                         "vtcon%i", con_driver->node);
3329
3330         if (IS_ERR(con_driver->dev)) {
3331                 printk(KERN_WARNING "Unable to create device for %s; "
3332                        "errno = %ld\n", con_driver->desc,
3333                        PTR_ERR(con_driver->dev));
3334                 con_driver->dev = NULL;
3335         } else {
3336                 vtconsole_init_device(con_driver);
3337         }
3338
3339 err:
3340         release_console_sem();
3341         module_put(owner);
3342         return retval;
3343 }
3344 EXPORT_SYMBOL(register_con_driver);
3345
3346 /**
3347  * unregister_con_driver - unregister console driver from console layer
3348  * @csw: console driver
3349  *
3350  * DESCRIPTION: All drivers that registers to the console layer must
3351  * call this function upon exit, or if the console driver is in a state
3352  * where it won't be able to handle console services, such as the
3353  * framebuffer console without loaded framebuffer drivers.
3354  *
3355  * The driver must unbind first prior to unregistration.
3356  */
3357 int unregister_con_driver(const struct consw *csw)
3358 {
3359         int i, retval = -ENODEV;
3360
3361         acquire_console_sem();
3362
3363         /* cannot unregister a bound driver */
3364         if (con_is_bound(csw))
3365                 goto err;
3366
3367         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3368                 struct con_driver *con_driver = &registered_con_driver[i];
3369
3370                 if (con_driver->con == csw &&
3371                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3372                         vtconsole_deinit_device(con_driver);
3373                         device_destroy(vtconsole_class,
3374                                        MKDEV(0, con_driver->node));
3375                         con_driver->con = NULL;
3376                         con_driver->desc = NULL;
3377                         con_driver->dev = NULL;
3378                         con_driver->node = 0;
3379                         con_driver->flag = 0;
3380                         con_driver->first = 0;
3381                         con_driver->last = 0;
3382                         retval = 0;
3383                         break;
3384                 }
3385         }
3386 err:
3387         release_console_sem();
3388         return retval;
3389 }
3390 EXPORT_SYMBOL(unregister_con_driver);
3391
3392 /*
3393  *      If we support more console drivers, this function is used
3394  *      when a driver wants to take over some existing consoles
3395  *      and become default driver for newly opened ones.
3396  *
3397  *      take_over_console is basically a register followed by unbind
3398  */
3399 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3400 {
3401         int err;
3402
3403         err = register_con_driver(csw, first, last);
3404
3405         if (!err)
3406                 bind_con_driver(csw, first, last, deflt);
3407
3408         return err;
3409 }
3410
3411 /*
3412  * give_up_console is a wrapper to unregister_con_driver. It will only
3413  * work if driver is fully unbound.
3414  */
3415 void give_up_console(const struct consw *csw)
3416 {
3417         unregister_con_driver(csw);
3418 }
3419
3420 static int __init vtconsole_class_init(void)
3421 {
3422         int i;
3423
3424         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3425         if (IS_ERR(vtconsole_class)) {
3426                 printk(KERN_WARNING "Unable to create vt console class; "
3427                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3428                 vtconsole_class = NULL;
3429         }
3430
3431         /* Add system drivers to sysfs */
3432         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3433                 struct con_driver *con = &registered_con_driver[i];
3434
3435                 if (con->con && !con->dev) {
3436                         con->dev = device_create(vtconsole_class, NULL,
3437                                                  MKDEV(0, con->node),
3438                                                  "vtcon%i", con->node);
3439
3440                         if (IS_ERR(con->dev)) {
3441                                 printk(KERN_WARNING "Unable to create "
3442                                        "device for %s; errno = %ld\n",
3443                                        con->desc, PTR_ERR(con->dev));
3444                                 con->dev = NULL;
3445                         } else {
3446                                 vtconsole_init_device(con);
3447                         }
3448                 }
3449         }
3450
3451         return 0;
3452 }
3453 postcore_initcall(vtconsole_class_init);
3454
3455 #endif
3456
3457 /*
3458  *      Screen blanking
3459  */
3460
3461 static int set_vesa_blanking(char __user *p)
3462 {
3463         unsigned int mode;
3464
3465         if (get_user(mode, p + 1))
3466                 return -EFAULT;
3467
3468         vesa_blank_mode = (mode < 4) ? mode : 0;
3469         return 0;
3470 }
3471
3472 void do_blank_screen(int entering_gfx)
3473 {
3474         struct vc_data *vc = vc_cons[fg_console].d;
3475         int i;
3476
3477         WARN_CONSOLE_UNLOCKED();
3478
3479         if (console_blanked) {
3480                 if (blank_state == blank_vesa_wait) {
3481                         blank_state = blank_off;
3482                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3483                 }
3484                 return;
3485         }
3486         if (blank_state != blank_normal_wait)
3487                 return;
3488         blank_state = blank_off;
3489
3490         /* entering graphics mode? */
3491         if (entering_gfx) {
3492                 hide_cursor(vc);
3493                 save_screen(vc);
3494                 vc->vc_sw->con_blank(vc, -1, 1);
3495                 console_blanked = fg_console + 1;
3496                 set_origin(vc);
3497                 return;
3498         }
3499
3500         /* don't blank graphics */
3501         if (vc->vc_mode != KD_TEXT) {
3502                 console_blanked = fg_console + 1;
3503                 return;
3504         }
3505
3506         hide_cursor(vc);
3507         del_timer_sync(&console_timer);
3508         blank_timer_expired = 0;
3509
3510         save_screen(vc);
3511         /* In case we need to reset origin, blanking hook returns 1 */
3512         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3513         console_blanked = fg_console + 1;
3514         if (i)
3515                 set_origin(vc);
3516
3517         if (console_blank_hook && console_blank_hook(1))
3518                 return;
3519
3520         if (vesa_off_interval && vesa_blank_mode) {
3521                 blank_state = blank_vesa_wait;
3522                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3523         }
3524 }
3525 EXPORT_SYMBOL(do_blank_screen);
3526
3527 /*
3528  * Called by timer as well as from vt_console_driver
3529  */
3530 void do_unblank_screen(int leaving_gfx)
3531 {
3532         struct vc_data *vc;
3533
3534         /* This should now always be called from a "sane" (read: can schedule)
3535          * context for the sake of the low level drivers, except in the special
3536          * case of oops_in_progress
3537          */
3538         if (!oops_in_progress)
3539                 might_sleep();
3540
3541         WARN_CONSOLE_UNLOCKED();
3542
3543         ignore_poke = 0;
3544         if (!console_blanked)
3545                 return;
3546         if (!vc_cons_allocated(fg_console)) {
3547                 /* impossible */
3548                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3549                 return;
3550         }
3551         vc = vc_cons[fg_console].d;
3552         if (vc->vc_mode != KD_TEXT)
3553                 return; /* but leave console_blanked != 0 */
3554
3555         if (blankinterval) {
3556                 mod_timer(&console_timer, jiffies + blankinterval);
3557                 blank_state = blank_normal_wait;
3558         }
3559
3560         console_blanked = 0;
3561         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3562                 /* Low-level driver cannot restore -> do it ourselves */
3563                 update_screen(vc);
3564         if (console_blank_hook)
3565                 console_blank_hook(0);
3566         set_palette(vc);
3567         set_cursor(vc);
3568 }
3569 EXPORT_SYMBOL(do_unblank_screen);
3570
3571 /*
3572  * This is called by the outside world to cause a forced unblank, mostly for
3573  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3574  * call it with 1 as an argument and so force a mode restore... that may kill
3575  * X or at least garbage the screen but would also make the Oops visible...
3576  */
3577 void unblank_screen(void)
3578 {
3579         do_unblank_screen(0);
3580 }
3581
3582 /*
3583  * We defer the timer blanking to work queue so it can take the console mutex
3584  * (console operations can still happen at irq time, but only from printk which
3585  * has the console mutex. Not perfect yet, but better than no locking
3586  */
3587 static void blank_screen_t(unsigned long dummy)
3588 {
3589         if (unlikely(!keventd_up())) {
3590                 mod_timer(&console_timer, jiffies + blankinterval);
3591                 return;
3592         }
3593         blank_timer_expired = 1;
3594         schedule_work(&console_work);
3595 }
3596
3597 void poke_blanked_console(void)
3598 {
3599         WARN_CONSOLE_UNLOCKED();
3600
3601         /* Add this so we quickly catch whoever might call us in a non
3602          * safe context. Nowadays, unblank_screen() isn't to be called in
3603          * atomic contexts and is allowed to schedule (with the special case
3604          * of oops_in_progress, but that isn't of any concern for this
3605          * function. --BenH.
3606          */
3607         might_sleep();
3608
3609         /* This isn't perfectly race free, but a race here would be mostly harmless,
3610          * at worse, we'll do a spurrious blank and it's unlikely
3611          */
3612         del_timer(&console_timer);
3613         blank_timer_expired = 0;
3614
3615         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3616                 return;
3617         if (console_blanked)
3618                 unblank_screen();
3619         else if (blankinterval) {
3620                 mod_timer(&console_timer, jiffies + blankinterval);
3621                 blank_state = blank_normal_wait;
3622         }
3623 }
3624
3625 /*
3626  *      Palettes
3627  */
3628
3629 static void set_palette(struct vc_data *vc)
3630 {
3631         WARN_CONSOLE_UNLOCKED();
3632
3633         if (vc->vc_mode != KD_GRAPHICS)
3634                 vc->vc_sw->con_set_palette(vc, color_table);
3635 }
3636
3637 static int set_get_cmap(unsigned char __user *arg, int set)
3638 {
3639     int i, j, k;
3640
3641     WARN_CONSOLE_UNLOCKED();
3642
3643     for (i = 0; i < 16; i++)
3644         if (set) {