Basic braille screen reader support
[linux-2.6.git] / drivers / char / vt.c
1 /*
2  *  linux/drivers/char/vt.c
3  *
4  *  Copyright (C) 1991, 1992  Linus Torvalds
5  */
6
7 /*
8  * Hopefully this will be a rather complete VT102 implementation.
9  *
10  * Beeping thanks to John T Kohl.
11  *
12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13  *   Chars, and VT100 enhancements by Peter MacDonald.
14  *
15  * Copy and paste function by Andrew Haylett,
16  *   some enhancements by Alessandro Rubini.
17  *
18  * Code to check for different video-cards mostly by Galen Hunt,
19  * <g-hunt@ee.utah.edu>
20  *
21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23  *
24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25  * Resizing of consoles, aeb, 940926
26  *
27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28  * <poe@daimi.aau.dk>
29  *
30  * User-defined bell sound, new setterm control sequences and printk
31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32  *
33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34  *
35  * Merge with the abstract console driver by Geert Uytterhoeven
36  * <geert@linux-m68k.org>, Jan 1997.
37  *
38  *   Original m68k console driver modifications by
39  *
40  *     - Arno Griffioen <arno@usn.nl>
41  *     - David Carter <carter@cs.bris.ac.uk>
42  * 
43  *   The abstract console driver provides a generic interface for a text
44  *   console. It supports VGA text mode, frame buffer based graphical consoles
45  *   and special graphics processors that are only accessible through some
46  *   registers (e.g. a TMS340x0 GSP).
47  *
48  *   The interface to the hardware is specified using a special structure
49  *   (struct consw) which contains function pointers to console operations
50  *   (see <linux/console.h> for more information).
51  *
52  * Support for changeable cursor shape
53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54  *
55  * Ported to i386 and con_scrolldelta fixed
56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
57  *
58  * Resurrected character buffers in videoram plus lots of other trickery
59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60  *
61  * Removed old-style timers, introduced console_timer, made timer
62  * deletion SMP-safe.  17Jun00, Andrew Morton <andrewm@uow.edu.au>
63  *
64  * Removed console_lock, enabled interrupts across all console operations
65  * 13 March 2001, Andrew Morton
66  *
67  * Fixed UTF-8 mode so alternate charset modes always work according
68  * to control sequences interpreted in do_con_trol function
69  * preserving backward VT100 semigraphics compatibility,
70  * malformed UTF sequences represented as sequences of replacement glyphs,
71  * original codes or '?' as a last resort if replacement glyph is undefined
72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
73  */
74
75 #include <linux/module.h>
76 #include <linux/types.h>
77 #include <linux/sched.h>
78 #include <linux/tty.h>
79 #include <linux/tty_flip.h>
80 #include <linux/kernel.h>
81 #include <linux/string.h>
82 #include <linux/errno.h>
83 #include <linux/kd.h>
84 #include <linux/slab.h>
85 #include <linux/major.h>
86 #include <linux/mm.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/mutex.h>
90 #include <linux/vt_kern.h>
91 #include <linux/selection.h>
92 #include <linux/tiocl.h>
93 #include <linux/kbd_kern.h>
94 #include <linux/consolemap.h>
95 #include <linux/timer.h>
96 #include <linux/interrupt.h>
97 #include <linux/workqueue.h>
98 #include <linux/bootmem.h>
99 #include <linux/pm.h>
100 #include <linux/font.h>
101 #include <linux/bitops.h>
102 #include <linux/notifier.h>
103
104 #include <asm/io.h>
105 #include <asm/system.h>
106 #include <asm/uaccess.h>
107
108 #define MAX_NR_CON_DRIVER 16
109
110 #define CON_DRIVER_FLAG_MODULE 1
111 #define CON_DRIVER_FLAG_INIT   2
112 #define CON_DRIVER_FLAG_ATTR   4
113
114 struct con_driver {
115         const struct consw *con;
116         const char *desc;
117         struct device *dev;
118         int node;
119         int first;
120         int last;
121         int flag;
122 };
123
124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
125 const struct consw *conswitchp;
126
127 /* A bitmap for codes <32. A bit of 1 indicates that the code
128  * corresponding to that bit number invokes some special action
129  * (such as cursor movement) and should not be displayed as a
130  * glyph unless the disp_ctrl mode is explicitly enabled.
131  */
132 #define CTRL_ACTION 0x0d00ff81
133 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
134
135 /*
136  * Here is the default bell parameters: 750HZ, 1/8th of a second
137  */
138 #define DEFAULT_BELL_PITCH      750
139 #define DEFAULT_BELL_DURATION   (HZ/8)
140
141 struct vc vc_cons [MAX_NR_CONSOLES];
142
143 #ifndef VT_SINGLE_DRIVER
144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145 #endif
146
147 static int con_open(struct tty_struct *, struct file *);
148 static void vc_init(struct vc_data *vc, unsigned int rows,
149                     unsigned int cols, int do_clear);
150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151 static void save_cur(struct vc_data *vc);
152 static void reset_terminal(struct vc_data *vc, int do_clear);
153 static void con_flush_chars(struct tty_struct *tty);
154 static int set_vesa_blanking(char __user *p);
155 static void set_cursor(struct vc_data *vc);
156 static void hide_cursor(struct vc_data *vc);
157 static void console_callback(struct work_struct *ignored);
158 static void blank_screen_t(unsigned long dummy);
159 static void set_palette(struct vc_data *vc);
160
161 static int printable;           /* Is console ready for printing? */
162 int default_utf8 = true;
163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
164
165 /*
166  * ignore_poke: don't unblank the screen when things are typed.  This is
167  * mainly for the privacy of braille terminal users.
168  */
169 static int ignore_poke;
170
171 int do_poke_blanked_console;
172 int console_blanked;
173
174 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
175 static int blankinterval = 10*60*HZ;
176 static int vesa_off_interval;
177
178 static DECLARE_WORK(console_work, console_callback);
179
180 /*
181  * fg_console is the current virtual console,
182  * last_console is the last used one,
183  * want_console is the console we want to switch to,
184  * kmsg_redirect is the console for kernel messages,
185  */
186 int fg_console;
187 int last_console;
188 int want_console = -1;
189 int kmsg_redirect;
190
191 /*
192  * For each existing display, we have a pointer to console currently visible
193  * on that display, allowing consoles other than fg_console to be refreshed
194  * appropriately. Unless the low-level driver supplies its own display_fg
195  * variable, we use this one for the "master display".
196  */
197 static struct vc_data *master_display_fg;
198
199 /*
200  * Unfortunately, we need to delay tty echo when we're currently writing to the
201  * console since the code is (and always was) not re-entrant, so we schedule
202  * all flip requests to process context with schedule-task() and run it from
203  * console_callback().
204  */
205
206 /*
207  * For the same reason, we defer scrollback to the console callback.
208  */
209 static int scrollback_delta;
210
211 /*
212  * Hook so that the power management routines can (un)blank
213  * the console on our behalf.
214  */
215 int (*console_blank_hook)(int);
216
217 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
218 static int blank_state;
219 static int blank_timer_expired;
220 enum {
221         blank_off = 0,
222         blank_normal_wait,
223         blank_vesa_wait,
224 };
225
226 /*
227  * Notifier list for console events.
228  */
229 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
230
231 int register_vt_notifier(struct notifier_block *nb)
232 {
233         return atomic_notifier_chain_register(&vt_notifier_list, nb);
234 }
235 EXPORT_SYMBOL_GPL(register_vt_notifier);
236
237 int unregister_vt_notifier(struct notifier_block *nb)
238 {
239         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
240 }
241 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
242
243 static void notify_write(struct vc_data *vc, unsigned int unicode)
244 {
245         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
246         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
247 }
248
249 static void notify_update(struct vc_data *vc)
250 {
251         struct vt_notifier_param param = { .vc = vc };
252         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
253 }
254
255 /*
256  *      Low-Level Functions
257  */
258
259 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
260
261 #ifdef VT_BUF_VRAM_ONLY
262 #define DO_UPDATE(vc)   0
263 #else
264 #define DO_UPDATE(vc)   CON_IS_VISIBLE(vc)
265 #endif
266
267 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
268 {
269         unsigned short *p;
270         
271         if (!viewed)
272                 p = (unsigned short *)(vc->vc_origin + offset);
273         else if (!vc->vc_sw->con_screen_pos)
274                 p = (unsigned short *)(vc->vc_visible_origin + offset);
275         else
276                 p = vc->vc_sw->con_screen_pos(vc, offset);
277         return p;
278 }
279
280 static inline void scrolldelta(int lines)
281 {
282         scrollback_delta += lines;
283         schedule_console_callback();
284 }
285
286 void schedule_console_callback(void)
287 {
288         schedule_work(&console_work);
289 }
290
291 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
292 {
293         unsigned short *d, *s;
294
295         if (t+nr >= b)
296                 nr = b - t - 1;
297         if (b > vc->vc_rows || t >= b || nr < 1)
298                 return;
299         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
300                 return;
301         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
302         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
303         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
304         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_scrl_erase_char,
305                     vc->vc_size_row * nr);
306 }
307
308 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
309 {
310         unsigned short *s;
311         unsigned int step;
312
313         if (t+nr >= b)
314                 nr = b - t - 1;
315         if (b > vc->vc_rows || t >= b || nr < 1)
316                 return;
317         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
318                 return;
319         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
320         step = vc->vc_cols * nr;
321         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
322         scr_memsetw(s, vc->vc_scrl_erase_char, 2 * step);
323 }
324
325 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
326 {
327 #ifndef VT_BUF_VRAM_ONLY
328         unsigned int xx, yy, offset;
329         u16 *p;
330
331         p = (u16 *) start;
332         if (!vc->vc_sw->con_getxy) {
333                 offset = (start - vc->vc_origin) / 2;
334                 xx = offset % vc->vc_cols;
335                 yy = offset / vc->vc_cols;
336         } else {
337                 int nxx, nyy;
338                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
339                 xx = nxx; yy = nyy;
340         }
341         for(;;) {
342                 u16 attrib = scr_readw(p) & 0xff00;
343                 int startx = xx;
344                 u16 *q = p;
345                 while (xx < vc->vc_cols && count) {
346                         if (attrib != (scr_readw(p) & 0xff00)) {
347                                 if (p > q)
348                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
349                                 startx = xx;
350                                 q = p;
351                                 attrib = scr_readw(p) & 0xff00;
352                         }
353                         p++;
354                         xx++;
355                         count--;
356                 }
357                 if (p > q)
358                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
359                 if (!count)
360                         break;
361                 xx = 0;
362                 yy++;
363                 if (vc->vc_sw->con_getxy) {
364                         p = (u16 *)start;
365                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
366                 }
367         }
368 #endif
369 }
370
371 void update_region(struct vc_data *vc, unsigned long start, int count)
372 {
373         WARN_CONSOLE_UNLOCKED();
374
375         if (DO_UPDATE(vc)) {
376                 hide_cursor(vc);
377                 do_update_region(vc, start, count);
378                 set_cursor(vc);
379         }
380 }
381
382 /* Structure of attributes is hardware-dependent */
383
384 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
385     u8 _underline, u8 _reverse, u8 _italic)
386 {
387         if (vc->vc_sw->con_build_attr)
388                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
389                        _blink, _underline, _reverse, _italic);
390
391 #ifndef VT_BUF_VRAM_ONLY
392 /*
393  * ++roman: I completely changed the attribute format for monochrome
394  * mode (!can_do_color). The formerly used MDA (monochrome display
395  * adapter) format didn't allow the combination of certain effects.
396  * Now the attribute is just a bit vector:
397  *  Bit 0..1: intensity (0..2)
398  *  Bit 2   : underline
399  *  Bit 3   : reverse
400  *  Bit 7   : blink
401  */
402         {
403         u8 a = _color;
404         if (!vc->vc_can_do_color)
405                 return _intensity |
406                        (_italic ? 2 : 0) |
407                        (_underline ? 4 : 0) |
408                        (_reverse ? 8 : 0) |
409                        (_blink ? 0x80 : 0);
410         if (_italic)
411                 a = (a & 0xF0) | vc->vc_itcolor;
412         else if (_underline)
413                 a = (a & 0xf0) | vc->vc_ulcolor;
414         else if (_intensity == 0)
415                 a = (a & 0xf0) | vc->vc_ulcolor;
416         if (_reverse)
417                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
418         if (_blink)
419                 a ^= 0x80;
420         if (_intensity == 2)
421                 a ^= 0x08;
422         if (vc->vc_hi_font_mask == 0x100)
423                 a <<= 1;
424         return a;
425         }
426 #else
427         return 0;
428 #endif
429 }
430
431 static void update_attr(struct vc_data *vc)
432 {
433         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
434                       vc->vc_blink, vc->vc_underline,
435                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
436         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
437         vc->vc_scrl_erase_char = (build_attr(vc, vc->vc_def_color, 1, false, false, false, false) << 8) | ' ';
438 }
439
440 /* Note: inverting the screen twice should revert to the original state */
441 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
442 {
443         unsigned short *p;
444
445         WARN_CONSOLE_UNLOCKED();
446
447         count /= 2;
448         p = screenpos(vc, offset, viewed);
449         if (vc->vc_sw->con_invert_region)
450                 vc->vc_sw->con_invert_region(vc, p, count);
451 #ifndef VT_BUF_VRAM_ONLY
452         else {
453                 u16 *q = p;
454                 int cnt = count;
455                 u16 a;
456
457                 if (!vc->vc_can_do_color) {
458                         while (cnt--) {
459                             a = scr_readw(q);
460                             a ^= 0x0800;
461                             scr_writew(a, q);
462                             q++;
463                         }
464                 } else if (vc->vc_hi_font_mask == 0x100) {
465                         while (cnt--) {
466                                 a = scr_readw(q);
467                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
468                                 scr_writew(a, q);
469                                 q++;
470                         }
471                 } else {
472                         while (cnt--) {
473                                 a = scr_readw(q);
474                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
475                                 scr_writew(a, q);
476                                 q++;
477                         }
478                 }
479         }
480 #endif
481         if (DO_UPDATE(vc))
482                 do_update_region(vc, (unsigned long) p, count);
483 }
484
485 /* used by selection: complement pointer position */
486 void complement_pos(struct vc_data *vc, int offset)
487 {
488         static int old_offset = -1;
489         static unsigned short old;
490         static unsigned short oldx, oldy;
491
492         WARN_CONSOLE_UNLOCKED();
493
494         if (old_offset != -1 && old_offset >= 0 &&
495             old_offset < vc->vc_screenbuf_size) {
496                 scr_writew(old, screenpos(vc, old_offset, 1));
497                 if (DO_UPDATE(vc))
498                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
499         }
500
501         old_offset = offset;
502
503         if (offset != -1 && offset >= 0 &&
504             offset < vc->vc_screenbuf_size) {
505                 unsigned short new;
506                 unsigned short *p;
507                 p = screenpos(vc, offset, 1);
508                 old = scr_readw(p);
509                 new = old ^ vc->vc_complement_mask;
510                 scr_writew(new, p);
511                 if (DO_UPDATE(vc)) {
512                         oldx = (offset >> 1) % vc->vc_cols;
513                         oldy = (offset >> 1) / vc->vc_cols;
514                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
515                 }
516         }
517
518 }
519
520 static void insert_char(struct vc_data *vc, unsigned int nr)
521 {
522         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
523
524         p = q + vc->vc_cols - nr - vc->vc_x;
525         while (--p >= q)
526                 scr_writew(scr_readw(p), p + nr);
527         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
528         vc->vc_need_wrap = 0;
529         if (DO_UPDATE(vc)) {
530                 unsigned short oldattr = vc->vc_attr;
531                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
532                                      vc->vc_cols - vc->vc_x - nr);
533                 vc->vc_attr = vc->vc_video_erase_char >> 8;
534                 while (nr--)
535                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
536                 vc->vc_attr = oldattr;
537         }
538 }
539
540 static void delete_char(struct vc_data *vc, unsigned int nr)
541 {
542         unsigned int i = vc->vc_x;
543         unsigned short *p = (unsigned short *)vc->vc_pos;
544
545         while (++i <= vc->vc_cols - nr) {
546                 scr_writew(scr_readw(p+nr), p);
547                 p++;
548         }
549         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
550         vc->vc_need_wrap = 0;
551         if (DO_UPDATE(vc)) {
552                 unsigned short oldattr = vc->vc_attr;
553                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
554                                      vc->vc_cols - vc->vc_x - nr);
555                 vc->vc_attr = vc->vc_video_erase_char >> 8;
556                 while (nr--)
557                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
558                                      vc->vc_cols - 1 - nr);
559                 vc->vc_attr = oldattr;
560         }
561 }
562
563 static int softcursor_original;
564
565 static void add_softcursor(struct vc_data *vc)
566 {
567         int i = scr_readw((u16 *) vc->vc_pos);
568         u32 type = vc->vc_cursor_type;
569
570         if (! (type & 0x10)) return;
571         if (softcursor_original != -1) return;
572         softcursor_original = i;
573         i |= ((type >> 8) & 0xff00 );
574         i ^= ((type) & 0xff00 );
575         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
576         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
577         scr_writew(i, (u16 *) vc->vc_pos);
578         if (DO_UPDATE(vc))
579                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
580 }
581
582 static void hide_softcursor(struct vc_data *vc)
583 {
584         if (softcursor_original != -1) {
585                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
586                 if (DO_UPDATE(vc))
587                         vc->vc_sw->con_putc(vc, softcursor_original,
588                                         vc->vc_y, vc->vc_x);
589                 softcursor_original = -1;
590         }
591 }
592
593 static void hide_cursor(struct vc_data *vc)
594 {
595         if (vc == sel_cons)
596                 clear_selection();
597         vc->vc_sw->con_cursor(vc, CM_ERASE);
598         hide_softcursor(vc);
599 }
600
601 static void set_cursor(struct vc_data *vc)
602 {
603         if (!IS_FG(vc) || console_blanked ||
604             vc->vc_mode == KD_GRAPHICS)
605                 return;
606         if (vc->vc_deccm) {
607                 if (vc == sel_cons)
608                         clear_selection();
609                 add_softcursor(vc);
610                 if ((vc->vc_cursor_type & 0x0f) != 1)
611                         vc->vc_sw->con_cursor(vc, CM_DRAW);
612         } else
613                 hide_cursor(vc);
614 }
615
616 static void set_origin(struct vc_data *vc)
617 {
618         WARN_CONSOLE_UNLOCKED();
619
620         if (!CON_IS_VISIBLE(vc) ||
621             !vc->vc_sw->con_set_origin ||
622             !vc->vc_sw->con_set_origin(vc))
623                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
624         vc->vc_visible_origin = vc->vc_origin;
625         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
626         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
627 }
628
629 static inline void save_screen(struct vc_data *vc)
630 {
631         WARN_CONSOLE_UNLOCKED();
632
633         if (vc->vc_sw->con_save_screen)
634                 vc->vc_sw->con_save_screen(vc);
635 }
636
637 /*
638  *      Redrawing of screen
639  */
640
641 static void clear_buffer_attributes(struct vc_data *vc)
642 {
643         unsigned short *p = (unsigned short *)vc->vc_origin;
644         int count = vc->vc_screenbuf_size / 2;
645         int mask = vc->vc_hi_font_mask | 0xff;
646
647         for (; count > 0; count--, p++) {
648                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
649         }
650 }
651
652 void redraw_screen(struct vc_data *vc, int is_switch)
653 {
654         int redraw = 0;
655
656         WARN_CONSOLE_UNLOCKED();
657
658         if (!vc) {
659                 /* strange ... */
660                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
661                 return;
662         }
663
664         if (is_switch) {
665                 struct vc_data *old_vc = vc_cons[fg_console].d;
666                 if (old_vc == vc)
667                         return;
668                 if (!CON_IS_VISIBLE(vc))
669                         redraw = 1;
670                 *vc->vc_display_fg = vc;
671                 fg_console = vc->vc_num;
672                 hide_cursor(old_vc);
673                 if (!CON_IS_VISIBLE(old_vc)) {
674                         save_screen(old_vc);
675                         set_origin(old_vc);
676                 }
677         } else {
678                 hide_cursor(vc);
679                 redraw = 1;
680         }
681
682         if (redraw) {
683                 int update;
684                 int old_was_color = vc->vc_can_do_color;
685
686                 set_origin(vc);
687                 update = vc->vc_sw->con_switch(vc);
688                 set_palette(vc);
689                 /*
690                  * If console changed from mono<->color, the best we can do
691                  * is to clear the buffer attributes. As it currently stands,
692                  * rebuilding new attributes from the old buffer is not doable
693                  * without overly complex code.
694                  */
695                 if (old_was_color != vc->vc_can_do_color) {
696                         update_attr(vc);
697                         clear_buffer_attributes(vc);
698                 }
699                 if (update && vc->vc_mode != KD_GRAPHICS)
700                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
701         }
702         set_cursor(vc);
703         if (is_switch) {
704                 set_leds();
705                 compute_shiftstate();
706                 notify_update(vc);
707         }
708 }
709
710 /*
711  *      Allocation, freeing and resizing of VTs.
712  */
713
714 int vc_cons_allocated(unsigned int i)
715 {
716         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
717 }
718
719 static void visual_init(struct vc_data *vc, int num, int init)
720 {
721         /* ++Geert: vc->vc_sw->con_init determines console size */
722         if (vc->vc_sw)
723                 module_put(vc->vc_sw->owner);
724         vc->vc_sw = conswitchp;
725 #ifndef VT_SINGLE_DRIVER
726         if (con_driver_map[num])
727                 vc->vc_sw = con_driver_map[num];
728 #endif
729         __module_get(vc->vc_sw->owner);
730         vc->vc_num = num;
731         vc->vc_display_fg = &master_display_fg;
732         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
733         vc->vc_uni_pagedir = 0;
734         vc->vc_hi_font_mask = 0;
735         vc->vc_complement_mask = 0;
736         vc->vc_can_do_color = 0;
737         vc->vc_sw->con_init(vc, init);
738         if (!vc->vc_complement_mask)
739                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
740         vc->vc_s_complement_mask = vc->vc_complement_mask;
741         vc->vc_size_row = vc->vc_cols << 1;
742         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
743 }
744
745 int vc_allocate(unsigned int currcons)  /* return 0 on success */
746 {
747         WARN_CONSOLE_UNLOCKED();
748
749         if (currcons >= MAX_NR_CONSOLES)
750                 return -ENXIO;
751         if (!vc_cons[currcons].d) {
752             struct vc_data *vc;
753             struct vt_notifier_param param;
754
755             /* prevent users from taking too much memory */
756             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
757               return -EPERM;
758
759             /* due to the granularity of kmalloc, we waste some memory here */
760             /* the alloc is done in two steps, to optimize the common situation
761                of a 25x80 console (structsize=216, screenbuf_size=4000) */
762             /* although the numbers above are not valid since long ago, the
763                point is still up-to-date and the comment still has its value
764                even if only as a historical artifact.  --mj, July 1998 */
765             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
766             if (!vc)
767                 return -ENOMEM;
768             vc_cons[currcons].d = vc;
769             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
770             visual_init(vc, currcons, 1);
771             if (!*vc->vc_uni_pagedir_loc)
772                 con_set_default_unimap(vc);
773             if (!vc->vc_kmalloced)
774                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
775             if (!vc->vc_screenbuf) {
776                 kfree(vc);
777                 vc_cons[currcons].d = NULL;
778                 return -ENOMEM;
779             }
780             vc->vc_kmalloced = 1;
781             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
782             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
783         }
784         return 0;
785 }
786
787 static inline int resize_screen(struct vc_data *vc, int width, int height,
788                                 int user)
789 {
790         /* Resizes the resolution of the display adapater */
791         int err = 0;
792
793         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
794                 err = vc->vc_sw->con_resize(vc, width, height, user);
795
796         return err;
797 }
798
799 /*
800  * Change # of rows and columns (0 means unchanged/the size of fg_console)
801  * [this is to be used together with some user program
802  * like resize that changes the hardware videomode]
803  */
804 #define VC_RESIZE_MAXCOL (32767)
805 #define VC_RESIZE_MAXROW (32767)
806 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
807 {
808         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
809         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
810         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
811         unsigned int end, user;
812         unsigned short *newscreen;
813
814         WARN_CONSOLE_UNLOCKED();
815
816         if (!vc)
817                 return -ENXIO;
818
819         user = vc->vc_resize_user;
820         vc->vc_resize_user = 0;
821
822         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
823                 return -EINVAL;
824
825         new_cols = (cols ? cols : vc->vc_cols);
826         new_rows = (lines ? lines : vc->vc_rows);
827         new_row_size = new_cols << 1;
828         new_screen_size = new_row_size * new_rows;
829
830         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
831                 return 0;
832
833         newscreen = kmalloc(new_screen_size, GFP_USER);
834         if (!newscreen)
835                 return -ENOMEM;
836
837         old_rows = vc->vc_rows;
838         old_cols = vc->vc_cols;
839         old_row_size = vc->vc_size_row;
840         old_screen_size = vc->vc_screenbuf_size;
841
842         err = resize_screen(vc, new_cols, new_rows, user);
843         if (err) {
844                 kfree(newscreen);
845                 return err;
846         }
847
848         vc->vc_rows = new_rows;
849         vc->vc_cols = new_cols;
850         vc->vc_size_row = new_row_size;
851         vc->vc_screenbuf_size = new_screen_size;
852
853         rlth = min(old_row_size, new_row_size);
854         rrem = new_row_size - rlth;
855         old_origin = vc->vc_origin;
856         new_origin = (long) newscreen;
857         new_scr_end = new_origin + new_screen_size;
858
859         if (vc->vc_y > new_rows) {
860                 if (old_rows - vc->vc_y < new_rows) {
861                         /*
862                          * Cursor near the bottom, copy contents from the
863                          * bottom of buffer
864                          */
865                         old_origin += (old_rows - new_rows) * old_row_size;
866                         end = vc->vc_scr_end;
867                 } else {
868                         /*
869                          * Cursor is in no man's land, copy 1/2 screenful
870                          * from the top and bottom of cursor position
871                          */
872                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
873                         end = old_origin + (old_row_size * new_rows);
874                 }
875         } else
876                 /*
877                  * Cursor near the top, copy contents from the top of buffer
878                  */
879                 end = (old_rows > new_rows) ? old_origin +
880                         (old_row_size * new_rows) :
881                         vc->vc_scr_end;
882
883         update_attr(vc);
884
885         while (old_origin < end) {
886                 scr_memcpyw((unsigned short *) new_origin,
887                             (unsigned short *) old_origin, rlth);
888                 if (rrem)
889                         scr_memsetw((void *)(new_origin + rlth),
890                                     vc->vc_video_erase_char, rrem);
891                 old_origin += old_row_size;
892                 new_origin += new_row_size;
893         }
894         if (new_scr_end > new_origin)
895                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
896                             new_scr_end - new_origin);
897         if (vc->vc_kmalloced)
898                 kfree(vc->vc_screenbuf);
899         vc->vc_screenbuf = newscreen;
900         vc->vc_kmalloced = 1;
901         vc->vc_screenbuf_size = new_screen_size;
902         set_origin(vc);
903
904         /* do part of a reset_terminal() */
905         vc->vc_top = 0;
906         vc->vc_bottom = vc->vc_rows;
907         gotoxy(vc, vc->vc_x, vc->vc_y);
908         save_cur(vc);
909
910         if (vc->vc_tty) {
911                 struct winsize ws, *cws = &vc->vc_tty->winsize;
912                 unsigned long flags;
913
914                 memset(&ws, 0, sizeof(ws));
915                 ws.ws_row = vc->vc_rows;
916                 ws.ws_col = vc->vc_cols;
917                 ws.ws_ypixel = vc->vc_scan_lines;
918
919                 mutex_lock(&vc->vc_tty->termios_mutex);
920                 spin_lock_irqsave(&vc->vc_tty->ctrl_lock, flags);
921                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
922                     vc->vc_tty->pgrp)
923                         kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
924                 spin_unlock_irqrestore(&vc->vc_tty->ctrl_lock, flags);
925                 *cws = ws;
926                 mutex_unlock(&vc->vc_tty->termios_mutex);
927         }
928
929         if (CON_IS_VISIBLE(vc))
930                 update_screen(vc);
931         return err;
932 }
933
934 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
935 {
936         int rc;
937
938         acquire_console_sem();
939         rc = vc_resize(vc, cols, lines);
940         release_console_sem();
941         return rc;
942 }
943
944 void vc_deallocate(unsigned int currcons)
945 {
946         WARN_CONSOLE_UNLOCKED();
947
948         if (vc_cons_allocated(currcons)) {
949                 struct vc_data *vc = vc_cons[currcons].d;
950                 struct vt_notifier_param param = { .vc = vc };
951                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
952                 vc->vc_sw->con_deinit(vc);
953                 put_pid(vc->vt_pid);
954                 module_put(vc->vc_sw->owner);
955                 if (vc->vc_kmalloced)
956                         kfree(vc->vc_screenbuf);
957                 if (currcons >= MIN_NR_CONSOLES)
958                         kfree(vc);
959                 vc_cons[currcons].d = NULL;
960         }
961 }
962
963 /*
964  *      VT102 emulator
965  */
966
967 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
968 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
969 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
970
971 #define decarm          VC_REPEAT
972 #define decckm          VC_CKMODE
973 #define kbdapplic       VC_APPLIC
974 #define lnm             VC_CRLF
975
976 /*
977  * this is what the terminal answers to a ESC-Z or csi0c query.
978  */
979 #define VT100ID "\033[?1;2c"
980 #define VT102ID "\033[?6c"
981
982 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
983                                        8,12,10,14, 9,13,11,15 };
984
985 /* the default colour table, for VGA+ colour systems */
986 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
987     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
988 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
989     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
990 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
991     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
992
993 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
994 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
995 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
996
997 /*
998  * gotoxy() must verify all boundaries, because the arguments
999  * might also be negative. If the given position is out of
1000  * bounds, the cursor is placed at the nearest margin.
1001  */
1002 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1003 {
1004         int min_y, max_y;
1005
1006         if (new_x < 0)
1007                 vc->vc_x = 0;
1008         else {
1009                 if (new_x >= vc->vc_cols)
1010                         vc->vc_x = vc->vc_cols - 1;
1011                 else
1012                         vc->vc_x = new_x;
1013         }
1014
1015         if (vc->vc_decom) {
1016                 min_y = vc->vc_top;
1017                 max_y = vc->vc_bottom;
1018         } else {
1019                 min_y = 0;
1020                 max_y = vc->vc_rows;
1021         }
1022         if (new_y < min_y)
1023                 vc->vc_y = min_y;
1024         else if (new_y >= max_y)
1025                 vc->vc_y = max_y - 1;
1026         else
1027                 vc->vc_y = new_y;
1028         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1029         vc->vc_need_wrap = 0;
1030 }
1031
1032 /* for absolute user moves, when decom is set */
1033 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1034 {
1035         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1036 }
1037
1038 void scrollback(struct vc_data *vc, int lines)
1039 {
1040         if (!lines)
1041                 lines = vc->vc_rows / 2;
1042         scrolldelta(-lines);
1043 }
1044
1045 void scrollfront(struct vc_data *vc, int lines)
1046 {
1047         if (!lines)
1048                 lines = vc->vc_rows / 2;
1049         scrolldelta(lines);
1050 }
1051
1052 static void lf(struct vc_data *vc)
1053 {
1054         /* don't scroll if above bottom of scrolling region, or
1055          * if below scrolling region
1056          */
1057         if (vc->vc_y + 1 == vc->vc_bottom)
1058                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1059         else if (vc->vc_y < vc->vc_rows - 1) {
1060                 vc->vc_y++;
1061                 vc->vc_pos += vc->vc_size_row;
1062         }
1063         vc->vc_need_wrap = 0;
1064         notify_write(vc, '\n');
1065 }
1066
1067 static void ri(struct vc_data *vc)
1068 {
1069         /* don't scroll if below top of scrolling region, or
1070          * if above scrolling region
1071          */
1072         if (vc->vc_y == vc->vc_top)
1073                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1074         else if (vc->vc_y > 0) {
1075                 vc->vc_y--;
1076                 vc->vc_pos -= vc->vc_size_row;
1077         }
1078         vc->vc_need_wrap = 0;
1079 }
1080
1081 static inline void cr(struct vc_data *vc)
1082 {
1083         vc->vc_pos -= vc->vc_x << 1;
1084         vc->vc_need_wrap = vc->vc_x = 0;
1085         notify_write(vc, '\r');
1086 }
1087
1088 static inline void bs(struct vc_data *vc)
1089 {
1090         if (vc->vc_x) {
1091                 vc->vc_pos -= 2;
1092                 vc->vc_x--;
1093                 vc->vc_need_wrap = 0;
1094                 notify_write(vc, '\b');
1095         }
1096 }
1097
1098 static inline void del(struct vc_data *vc)
1099 {
1100         /* ignored */
1101 }
1102
1103 static void csi_J(struct vc_data *vc, int vpar)
1104 {
1105         unsigned int count;
1106         unsigned short * start;
1107
1108         switch (vpar) {
1109                 case 0: /* erase from cursor to end of display */
1110                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1111                         start = (unsigned short *)vc->vc_pos;
1112                         if (DO_UPDATE(vc)) {
1113                                 /* do in two stages */
1114                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1115                                               vc->vc_cols - vc->vc_x);
1116                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1117                                               vc->vc_rows - vc->vc_y - 1,
1118                                               vc->vc_cols);
1119                         }
1120                         break;
1121                 case 1: /* erase from start to cursor */
1122                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1123                         start = (unsigned short *)vc->vc_origin;
1124                         if (DO_UPDATE(vc)) {
1125                                 /* do in two stages */
1126                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1127                                               vc->vc_cols);
1128                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1129                                               vc->vc_x + 1);
1130                         }
1131                         break;
1132                 case 2: /* erase whole display */
1133                         count = vc->vc_cols * vc->vc_rows;
1134                         start = (unsigned short *)vc->vc_origin;
1135                         if (DO_UPDATE(vc))
1136                                 vc->vc_sw->con_clear(vc, 0, 0,
1137                                               vc->vc_rows,
1138                                               vc->vc_cols);
1139                         break;
1140                 default:
1141                         return;
1142         }
1143         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1144         vc->vc_need_wrap = 0;
1145 }
1146
1147 static void csi_K(struct vc_data *vc, int vpar)
1148 {
1149         unsigned int count;
1150         unsigned short * start;
1151
1152         switch (vpar) {
1153                 case 0: /* erase from cursor to end of line */
1154                         count = vc->vc_cols - vc->vc_x;
1155                         start = (unsigned short *)vc->vc_pos;
1156                         if (DO_UPDATE(vc))
1157                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1158                                                      vc->vc_cols - vc->vc_x);
1159                         break;
1160                 case 1: /* erase from start of line to cursor */
1161                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1162                         count = vc->vc_x + 1;
1163                         if (DO_UPDATE(vc))
1164                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1165                                                      vc->vc_x + 1);
1166                         break;
1167                 case 2: /* erase whole line */
1168                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1169                         count = vc->vc_cols;
1170                         if (DO_UPDATE(vc))
1171                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1172                                               vc->vc_cols);
1173                         break;
1174                 default:
1175                         return;
1176         }
1177         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1178         vc->vc_need_wrap = 0;
1179 }
1180
1181 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1182 {                                         /* not vt100? */
1183         int count;
1184
1185         if (!vpar)
1186                 vpar++;
1187         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1188
1189         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1190         if (DO_UPDATE(vc))
1191                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1192         vc->vc_need_wrap = 0;
1193 }
1194
1195 static void default_attr(struct vc_data *vc)
1196 {
1197         vc->vc_intensity = 1;
1198         vc->vc_italic = 0;
1199         vc->vc_underline = 0;
1200         vc->vc_reverse = 0;
1201         vc->vc_blink = 0;
1202         vc->vc_color = vc->vc_def_color;
1203 }
1204
1205 /* console_sem is held */
1206 static void csi_m(struct vc_data *vc)
1207 {
1208         int i;
1209
1210         for (i = 0; i <= vc->vc_npar; i++)
1211                 switch (vc->vc_par[i]) {
1212                         case 0: /* all attributes off */
1213                                 default_attr(vc);
1214                                 break;
1215                         case 1:
1216                                 vc->vc_intensity = 2;
1217                                 break;
1218                         case 2:
1219                                 vc->vc_intensity = 0;
1220                                 break;
1221                         case 3:
1222                                 vc->vc_italic = 1;
1223                                 break;
1224                         case 4:
1225                                 vc->vc_underline = 1;
1226                                 break;
1227                         case 5:
1228                                 vc->vc_blink = 1;
1229                                 break;
1230                         case 7:
1231                                 vc->vc_reverse = 1;
1232                                 break;
1233                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1234                                   * Select primary font, don't display
1235                                   * control chars if defined, don't set
1236                                   * bit 8 on output.
1237                                   */
1238                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1239                                                 ? vc->vc_G0_charset
1240                                                 : vc->vc_G1_charset, vc);
1241                                 vc->vc_disp_ctrl = 0;
1242                                 vc->vc_toggle_meta = 0;
1243                                 break;
1244                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1245                                   * Select first alternate font, lets
1246                                   * chars < 32 be displayed as ROM chars.
1247                                   */
1248                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1249                                 vc->vc_disp_ctrl = 1;
1250                                 vc->vc_toggle_meta = 0;
1251                                 break;
1252                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1253                                   * Select second alternate font, toggle
1254                                   * high bit before displaying as ROM char.
1255                                   */
1256                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1257                                 vc->vc_disp_ctrl = 1;
1258                                 vc->vc_toggle_meta = 1;
1259                                 break;
1260                         case 21:
1261                         case 22:
1262                                 vc->vc_intensity = 1;
1263                                 break;
1264                         case 23:
1265                                 vc->vc_italic = 0;
1266                                 break;
1267                         case 24:
1268                                 vc->vc_underline = 0;
1269                                 break;
1270                         case 25:
1271                                 vc->vc_blink = 0;
1272                                 break;
1273                         case 27:
1274                                 vc->vc_reverse = 0;
1275                                 break;
1276                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1277                                   * Enables underscore, white foreground
1278                                   * with white underscore (Linux - use
1279                                   * default foreground).
1280                                   */
1281                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1282                                 vc->vc_underline = 1;
1283                                 break;
1284                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1285                                   * Disable underline option.
1286                                   * Reset colour to default? It did this
1287                                   * before...
1288                                   */
1289                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1290                                 vc->vc_underline = 0;
1291                                 break;
1292                         case 49:
1293                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1294                                 break;
1295                         default:
1296                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1297                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1298                                                 | (vc->vc_color & 0xf0);
1299                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1300                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1301                                                 | (vc->vc_color & 0x0f);
1302                                 break;
1303                 }
1304         update_attr(vc);
1305 }
1306
1307 static void respond_string(const char *p, struct tty_struct *tty)
1308 {
1309         while (*p) {
1310                 tty_insert_flip_char(tty, *p, 0);
1311                 p++;
1312         }
1313         con_schedule_flip(tty);
1314 }
1315
1316 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1317 {
1318         char buf[40];
1319
1320         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1321         respond_string(buf, tty);
1322 }
1323
1324 static inline void status_report(struct tty_struct *tty)
1325 {
1326         respond_string("\033[0n", tty); /* Terminal ok */
1327 }
1328
1329 static inline void respond_ID(struct tty_struct * tty)
1330 {
1331         respond_string(VT102ID, tty);
1332 }
1333
1334 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1335 {
1336         char buf[8];
1337
1338         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1339                 (char)('!' + mry));
1340         respond_string(buf, tty);
1341 }
1342
1343 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1344 int mouse_reporting(void)
1345 {
1346         return vc_cons[fg_console].d->vc_report_mouse;
1347 }
1348
1349 /* console_sem is held */
1350 static void set_mode(struct vc_data *vc, int on_off)
1351 {
1352         int i;
1353
1354         for (i = 0; i <= vc->vc_npar; i++)
1355                 if (vc->vc_ques) {
1356                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1357                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1358                                 if (on_off)
1359                                         set_kbd(vc, decckm);
1360                                 else
1361                                         clr_kbd(vc, decckm);
1362                                 break;
1363                         case 3: /* 80/132 mode switch unimplemented */
1364                                 vc->vc_deccolm = on_off;
1365 #if 0
1366                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1367                                 /* this alone does not suffice; some user mode
1368                                    utility has to change the hardware regs */
1369 #endif
1370                                 break;
1371                         case 5:                 /* Inverted screen on/off */
1372                                 if (vc->vc_decscnm != on_off) {
1373                                         vc->vc_decscnm = on_off;
1374                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1375                                         update_attr(vc);
1376                                 }
1377                                 break;
1378                         case 6:                 /* Origin relative/absolute */
1379                                 vc->vc_decom = on_off;
1380                                 gotoxay(vc, 0, 0);
1381                                 break;
1382                         case 7:                 /* Autowrap on/off */
1383                                 vc->vc_decawm = on_off;
1384                                 break;
1385                         case 8:                 /* Autorepeat on/off */
1386                                 if (on_off)
1387                                         set_kbd(vc, decarm);
1388                                 else
1389                                         clr_kbd(vc, decarm);
1390                                 break;
1391                         case 9:
1392                                 vc->vc_report_mouse = on_off ? 1 : 0;
1393                                 break;
1394                         case 25:                /* Cursor on/off */
1395                                 vc->vc_deccm = on_off;
1396                                 break;
1397                         case 1000:
1398                                 vc->vc_report_mouse = on_off ? 2 : 0;
1399                                 break;
1400                         }
1401                 } else {
1402                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1403                         case 3:                 /* Monitor (display ctrls) */
1404                                 vc->vc_disp_ctrl = on_off;
1405                                 break;
1406                         case 4:                 /* Insert Mode on/off */
1407                                 vc->vc_decim = on_off;
1408                                 break;
1409                         case 20:                /* Lf, Enter == CrLf/Lf */
1410                                 if (on_off)
1411                                         set_kbd(vc, lnm);
1412                                 else
1413                                         clr_kbd(vc, lnm);
1414                                 break;
1415                         }
1416                 }
1417 }
1418
1419 /* console_sem is held */
1420 static void setterm_command(struct vc_data *vc)
1421 {
1422         switch(vc->vc_par[0]) {
1423                 case 1: /* set color for underline mode */
1424                         if (vc->vc_can_do_color &&
1425                                         vc->vc_par[1] < 16) {
1426                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1427                                 if (vc->vc_underline)
1428                                         update_attr(vc);
1429                         }
1430                         break;
1431                 case 2: /* set color for half intensity mode */
1432                         if (vc->vc_can_do_color &&
1433                                         vc->vc_par[1] < 16) {
1434                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1435                                 if (vc->vc_intensity == 0)
1436                                         update_attr(vc);
1437                         }
1438                         break;
1439                 case 8: /* store colors as defaults */
1440                         vc->vc_def_color = vc->vc_attr;
1441                         if (vc->vc_hi_font_mask == 0x100)
1442                                 vc->vc_def_color >>= 1;
1443                         default_attr(vc);
1444                         update_attr(vc);
1445                         break;
1446                 case 9: /* set blanking interval */
1447                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1448                         poke_blanked_console();
1449                         break;
1450                 case 10: /* set bell frequency in Hz */
1451                         if (vc->vc_npar >= 1)
1452                                 vc->vc_bell_pitch = vc->vc_par[1];
1453                         else
1454                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1455                         break;
1456                 case 11: /* set bell duration in msec */
1457                         if (vc->vc_npar >= 1)
1458                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1459                                         vc->vc_par[1] * HZ / 1000 : 0;
1460                         else
1461                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1462                         break;
1463                 case 12: /* bring specified console to the front */
1464                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1465                                 set_console(vc->vc_par[1] - 1);
1466                         break;
1467                 case 13: /* unblank the screen */
1468                         poke_blanked_console();
1469                         break;
1470                 case 14: /* set vesa powerdown interval */
1471                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1472                         break;
1473                 case 15: /* activate the previous console */
1474                         set_console(last_console);
1475                         break;
1476         }
1477 }
1478
1479 /* console_sem is held */
1480 static void csi_at(struct vc_data *vc, unsigned int nr)
1481 {
1482         if (nr > vc->vc_cols - vc->vc_x)
1483                 nr = vc->vc_cols - vc->vc_x;
1484         else if (!nr)
1485                 nr = 1;
1486         insert_char(vc, nr);
1487 }
1488
1489 /* console_sem is held */
1490 static void csi_L(struct vc_data *vc, unsigned int nr)
1491 {
1492         if (nr > vc->vc_rows - vc->vc_y)
1493                 nr = vc->vc_rows - vc->vc_y;
1494         else if (!nr)
1495                 nr = 1;
1496         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1497         vc->vc_need_wrap = 0;
1498 }
1499
1500 /* console_sem is held */
1501 static void csi_P(struct vc_data *vc, unsigned int nr)
1502 {
1503         if (nr > vc->vc_cols - vc->vc_x)
1504                 nr = vc->vc_cols - vc->vc_x;
1505         else if (!nr)
1506                 nr = 1;
1507         delete_char(vc, nr);
1508 }
1509
1510 /* console_sem is held */
1511 static void csi_M(struct vc_data *vc, unsigned int nr)
1512 {
1513         if (nr > vc->vc_rows - vc->vc_y)
1514                 nr = vc->vc_rows - vc->vc_y;
1515         else if (!nr)
1516                 nr=1;
1517         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1518         vc->vc_need_wrap = 0;
1519 }
1520
1521 /* console_sem is held (except via vc_init->reset_terminal */
1522 static void save_cur(struct vc_data *vc)
1523 {
1524         vc->vc_saved_x          = vc->vc_x;
1525         vc->vc_saved_y          = vc->vc_y;
1526         vc->vc_s_intensity      = vc->vc_intensity;
1527         vc->vc_s_italic         = vc->vc_italic;
1528         vc->vc_s_underline      = vc->vc_underline;
1529         vc->vc_s_blink          = vc->vc_blink;
1530         vc->vc_s_reverse        = vc->vc_reverse;
1531         vc->vc_s_charset        = vc->vc_charset;
1532         vc->vc_s_color          = vc->vc_color;
1533         vc->vc_saved_G0         = vc->vc_G0_charset;
1534         vc->vc_saved_G1         = vc->vc_G1_charset;
1535 }
1536
1537 /* console_sem is held */
1538 static void restore_cur(struct vc_data *vc)
1539 {
1540         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1541         vc->vc_intensity        = vc->vc_s_intensity;
1542         vc->vc_italic           = vc->vc_s_italic;
1543         vc->vc_underline        = vc->vc_s_underline;
1544         vc->vc_blink            = vc->vc_s_blink;
1545         vc->vc_reverse          = vc->vc_s_reverse;
1546         vc->vc_charset          = vc->vc_s_charset;
1547         vc->vc_color            = vc->vc_s_color;
1548         vc->vc_G0_charset       = vc->vc_saved_G0;
1549         vc->vc_G1_charset       = vc->vc_saved_G1;
1550         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1551         update_attr(vc);
1552         vc->vc_need_wrap = 0;
1553 }
1554
1555 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1556         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1557         ESpalette };
1558
1559 /* console_sem is held (except via vc_init()) */
1560 static void reset_terminal(struct vc_data *vc, int do_clear)
1561 {
1562         vc->vc_top              = 0;
1563         vc->vc_bottom           = vc->vc_rows;
1564         vc->vc_state            = ESnormal;
1565         vc->vc_ques             = 0;
1566         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1567         vc->vc_G0_charset       = LAT1_MAP;
1568         vc->vc_G1_charset       = GRAF_MAP;
1569         vc->vc_charset          = 0;
1570         vc->vc_need_wrap        = 0;
1571         vc->vc_report_mouse     = 0;
1572         vc->vc_utf              = default_utf8;
1573         vc->vc_utf_count        = 0;
1574
1575         vc->vc_disp_ctrl        = 0;
1576         vc->vc_toggle_meta      = 0;
1577
1578         vc->vc_decscnm          = 0;
1579         vc->vc_decom            = 0;
1580         vc->vc_decawm           = 1;
1581         vc->vc_deccm            = 1;
1582         vc->vc_decim            = 0;
1583
1584         set_kbd(vc, decarm);
1585         clr_kbd(vc, decckm);
1586         clr_kbd(vc, kbdapplic);
1587         clr_kbd(vc, lnm);
1588         kbd_table[vc->vc_num].lockstate = 0;
1589         kbd_table[vc->vc_num].slockstate = 0;
1590         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1591         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1592         /* do not do set_leds here because this causes an endless tasklet loop
1593            when the keyboard hasn't been initialized yet */
1594
1595         vc->vc_cursor_type = CUR_DEFAULT;
1596         vc->vc_complement_mask = vc->vc_s_complement_mask;
1597
1598         default_attr(vc);
1599         update_attr(vc);
1600
1601         vc->vc_tab_stop[0]      = 0x01010100;
1602         vc->vc_tab_stop[1]      =
1603         vc->vc_tab_stop[2]      =
1604         vc->vc_tab_stop[3]      =
1605         vc->vc_tab_stop[4]      = 0x01010101;
1606
1607         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1608         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1609
1610         gotoxy(vc, 0, 0);
1611         save_cur(vc);
1612         if (do_clear)
1613             csi_J(vc, 2);
1614 }
1615
1616 /* console_sem is held */
1617 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1618 {
1619         /*
1620          *  Control characters can be used in the _middle_
1621          *  of an escape sequence.
1622          */
1623         switch (c) {
1624         case 0:
1625                 return;
1626         case 7:
1627                 if (vc->vc_bell_duration)
1628                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1629                 return;
1630         case 8:
1631                 bs(vc);
1632                 return;
1633         case 9:
1634                 vc->vc_pos -= (vc->vc_x << 1);
1635                 while (vc->vc_x < vc->vc_cols - 1) {
1636                         vc->vc_x++;
1637                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1638                                 break;
1639                 }
1640                 vc->vc_pos += (vc->vc_x << 1);
1641                 notify_write(vc, '\t');
1642                 return;
1643         case 10: case 11: case 12:
1644                 lf(vc);
1645                 if (!is_kbd(vc, lnm))
1646                         return;
1647         case 13:
1648                 cr(vc);
1649                 return;
1650         case 14:
1651                 vc->vc_charset = 1;
1652                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1653                 vc->vc_disp_ctrl = 1;
1654                 return;
1655         case 15:
1656                 vc->vc_charset = 0;
1657                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1658                 vc->vc_disp_ctrl = 0;
1659                 return;
1660         case 24: case 26:
1661                 vc->vc_state = ESnormal;
1662                 return;
1663         case 27:
1664                 vc->vc_state = ESesc;
1665                 return;
1666         case 127:
1667                 del(vc);
1668                 return;
1669         case 128+27:
1670                 vc->vc_state = ESsquare;
1671                 return;
1672         }
1673         switch(vc->vc_state) {
1674         case ESesc:
1675                 vc->vc_state = ESnormal;
1676                 switch (c) {
1677                 case '[':
1678                         vc->vc_state = ESsquare;
1679                         return;
1680                 case ']':
1681                         vc->vc_state = ESnonstd;
1682                         return;
1683                 case '%':
1684                         vc->vc_state = ESpercent;
1685                         return;
1686                 case 'E':
1687                         cr(vc);
1688                         lf(vc);
1689                         return;
1690                 case 'M':
1691                         ri(vc);
1692                         return;
1693                 case 'D':
1694                         lf(vc);
1695                         return;
1696                 case 'H':
1697                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1698                         return;
1699                 case 'Z':
1700                         respond_ID(tty);
1701                         return;
1702                 case '7':
1703                         save_cur(vc);
1704                         return;
1705                 case '8':
1706                         restore_cur(vc);
1707                         return;
1708                 case '(':
1709                         vc->vc_state = ESsetG0;
1710                         return;
1711                 case ')':
1712                         vc->vc_state = ESsetG1;
1713                         return;
1714                 case '#':
1715                         vc->vc_state = EShash;
1716                         return;
1717                 case 'c':
1718                         reset_terminal(vc, 1);
1719                         return;
1720                 case '>':  /* Numeric keypad */
1721                         clr_kbd(vc, kbdapplic);
1722                         return;
1723                 case '=':  /* Appl. keypad */
1724                         set_kbd(vc, kbdapplic);
1725                         return;
1726                 }
1727                 return;
1728         case ESnonstd:
1729                 if (c=='P') {   /* palette escape sequence */
1730                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1731                                 vc->vc_par[vc->vc_npar] = 0;
1732                         vc->vc_npar = 0;
1733                         vc->vc_state = ESpalette;
1734                         return;
1735                 } else if (c=='R') {   /* reset palette */
1736                         reset_palette(vc);
1737                         vc->vc_state = ESnormal;
1738                 } else
1739                         vc->vc_state = ESnormal;
1740                 return;
1741         case ESpalette:
1742                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1743                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1744                         if (vc->vc_npar == 7) {
1745                                 int i = vc->vc_par[0] * 3, j = 1;
1746                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1747                                 vc->vc_palette[i++] += vc->vc_par[j++];
1748                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1749                                 vc->vc_palette[i++] += vc->vc_par[j++];
1750                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1751                                 vc->vc_palette[i] += vc->vc_par[j];
1752                                 set_palette(vc);
1753                                 vc->vc_state = ESnormal;
1754                         }
1755                 } else
1756                         vc->vc_state = ESnormal;
1757                 return;
1758         case ESsquare:
1759                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1760                         vc->vc_par[vc->vc_npar] = 0;
1761                 vc->vc_npar = 0;
1762                 vc->vc_state = ESgetpars;
1763                 if (c == '[') { /* Function key */
1764                         vc->vc_state=ESfunckey;
1765                         return;
1766                 }
1767                 vc->vc_ques = (c == '?');
1768                 if (vc->vc_ques)
1769                         return;
1770         case ESgetpars:
1771                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1772                         vc->vc_npar++;
1773                         return;
1774                 } else if (c>='0' && c<='9') {
1775                         vc->vc_par[vc->vc_npar] *= 10;
1776                         vc->vc_par[vc->vc_npar] += c - '0';
1777                         return;
1778                 } else
1779                         vc->vc_state = ESgotpars;
1780         case ESgotpars:
1781                 vc->vc_state = ESnormal;
1782                 switch(c) {
1783                 case 'h':
1784                         set_mode(vc, 1);
1785                         return;
1786                 case 'l':
1787                         set_mode(vc, 0);
1788                         return;
1789                 case 'c':
1790                         if (vc->vc_ques) {
1791                                 if (vc->vc_par[0])
1792                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1793                                 else
1794                                         vc->vc_cursor_type = CUR_DEFAULT;
1795                                 return;
1796                         }
1797                         break;
1798                 case 'm':
1799                         if (vc->vc_ques) {
1800                                 clear_selection();
1801                                 if (vc->vc_par[0])
1802                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1803                                 else
1804                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1805                                 return;
1806                         }
1807                         break;
1808                 case 'n':
1809                         if (!vc->vc_ques) {
1810                                 if (vc->vc_par[0] == 5)
1811                                         status_report(tty);
1812                                 else if (vc->vc_par[0] == 6)
1813                                         cursor_report(vc, tty);
1814                         }
1815                         return;
1816                 }
1817                 if (vc->vc_ques) {
1818                         vc->vc_ques = 0;
1819                         return;
1820                 }
1821                 switch(c) {
1822                 case 'G': case '`':
1823                         if (vc->vc_par[0])
1824                                 vc->vc_par[0]--;
1825                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1826                         return;
1827                 case 'A':
1828                         if (!vc->vc_par[0])
1829                                 vc->vc_par[0]++;
1830                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1831                         return;
1832                 case 'B': case 'e':
1833                         if (!vc->vc_par[0])
1834                                 vc->vc_par[0]++;
1835                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1836                         return;
1837                 case 'C': case 'a':
1838                         if (!vc->vc_par[0])
1839                                 vc->vc_par[0]++;
1840                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1841                         return;
1842                 case 'D':
1843                         if (!vc->vc_par[0])
1844                                 vc->vc_par[0]++;
1845                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1846                         return;
1847                 case 'E':
1848                         if (!vc->vc_par[0])
1849                                 vc->vc_par[0]++;
1850                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1851                         return;
1852                 case 'F':
1853                         if (!vc->vc_par[0])
1854                                 vc->vc_par[0]++;
1855                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1856                         return;
1857                 case 'd':
1858                         if (vc->vc_par[0])
1859                                 vc->vc_par[0]--;
1860                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1861                         return;
1862                 case 'H': case 'f':
1863                         if (vc->vc_par[0])
1864                                 vc->vc_par[0]--;
1865                         if (vc->vc_par[1])
1866                                 vc->vc_par[1]--;
1867                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1868                         return;
1869                 case 'J':
1870                         csi_J(vc, vc->vc_par[0]);
1871                         return;
1872                 case 'K':
1873                         csi_K(vc, vc->vc_par[0]);
1874                         return;
1875                 case 'L':
1876                         csi_L(vc, vc->vc_par[0]);
1877                         return;
1878                 case 'M':
1879                         csi_M(vc, vc->vc_par[0]);
1880                         return;
1881                 case 'P':
1882                         csi_P(vc, vc->vc_par[0]);
1883                         return;
1884                 case 'c':
1885                         if (!vc->vc_par[0])
1886                                 respond_ID(tty);
1887                         return;
1888                 case 'g':
1889                         if (!vc->vc_par[0])
1890                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1891                         else if (vc->vc_par[0] == 3) {
1892                                 vc->vc_tab_stop[0] =
1893                                         vc->vc_tab_stop[1] =
1894                                         vc->vc_tab_stop[2] =
1895                                         vc->vc_tab_stop[3] =
1896                                         vc->vc_tab_stop[4] = 0;
1897                         }
1898                         return;
1899                 case 'm':
1900                         csi_m(vc);
1901                         return;
1902                 case 'q': /* DECLL - but only 3 leds */
1903                         /* map 0,1,2,3 to 0,1,2,4 */
1904                         if (vc->vc_par[0] < 4)
1905                                 setledstate(kbd_table + vc->vc_num,
1906                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1907                         return;
1908                 case 'r':
1909                         if (!vc->vc_par[0])
1910                                 vc->vc_par[0]++;
1911                         if (!vc->vc_par[1])
1912                                 vc->vc_par[1] = vc->vc_rows;
1913                         /* Minimum allowed region is 2 lines */
1914                         if (vc->vc_par[0] < vc->vc_par[1] &&
1915                             vc->vc_par[1] <= vc->vc_rows) {
1916                                 vc->vc_top = vc->vc_par[0] - 1;
1917                                 vc->vc_bottom = vc->vc_par[1];
1918                                 gotoxay(vc, 0, 0);
1919                         }
1920                         return;
1921                 case 's':
1922                         save_cur(vc);
1923                         return;
1924                 case 'u':
1925                         restore_cur(vc);
1926                         return;
1927                 case 'X':
1928                         csi_X(vc, vc->vc_par[0]);
1929                         return;
1930                 case '@':
1931                         csi_at(vc, vc->vc_par[0]);
1932                         return;
1933                 case ']': /* setterm functions */
1934                         setterm_command(vc);
1935                         return;
1936                 }
1937                 return;
1938         case ESpercent:
1939                 vc->vc_state = ESnormal;
1940                 switch (c) {
1941                 case '@':  /* defined in ISO 2022 */
1942                         vc->vc_utf = 0;
1943                         return;
1944                 case 'G':  /* prelim official escape code */
1945                 case '8':  /* retained for compatibility */
1946                         vc->vc_utf = 1;
1947                         return;
1948                 }
1949                 return;
1950         case ESfunckey:
1951                 vc->vc_state = ESnormal;
1952                 return;
1953         case EShash:
1954                 vc->vc_state = ESnormal;
1955                 if (c == '8') {
1956                         /* DEC screen alignment test. kludge :-) */
1957                         vc->vc_video_erase_char =
1958                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1959                         csi_J(vc, 2);
1960                         vc->vc_video_erase_char =
1961                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1962                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1963                 }
1964                 return;
1965         case ESsetG0:
1966                 if (c == '0')
1967                         vc->vc_G0_charset = GRAF_MAP;
1968                 else if (c == 'B')
1969                         vc->vc_G0_charset = LAT1_MAP;
1970                 else if (c == 'U')
1971                         vc->vc_G0_charset = IBMPC_MAP;
1972                 else if (c == 'K')
1973                         vc->vc_G0_charset = USER_MAP;
1974                 if (vc->vc_charset == 0)
1975                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1976                 vc->vc_state = ESnormal;
1977                 return;
1978         case ESsetG1:
1979                 if (c == '0')
1980                         vc->vc_G1_charset = GRAF_MAP;
1981                 else if (c == 'B')
1982                         vc->vc_G1_charset = LAT1_MAP;
1983                 else if (c == 'U')
1984                         vc->vc_G1_charset = IBMPC_MAP;
1985                 else if (c == 'K')
1986                         vc->vc_G1_charset = USER_MAP;
1987                 if (vc->vc_charset == 1)
1988                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1989                 vc->vc_state = ESnormal;
1990                 return;
1991         default:
1992                 vc->vc_state = ESnormal;
1993         }
1994 }
1995
1996 /* This is a temporary buffer used to prepare a tty console write
1997  * so that we can easily avoid touching user space while holding the
1998  * console spinlock.  It is allocated in con_init and is shared by
1999  * this code and the vc_screen read/write tty calls.
2000  *
2001  * We have to allocate this statically in the kernel data section
2002  * since console_init (and thus con_init) are called before any
2003  * kernel memory allocation is available.
2004  */
2005 char con_buf[CON_BUF_SIZE];
2006 DEFINE_MUTEX(con_buf_mtx);
2007
2008 /* is_double_width() is based on the wcwidth() implementation by
2009  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2010  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2011  */
2012 struct interval {
2013         uint32_t first;
2014         uint32_t last;
2015 };
2016
2017 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2018 {
2019         int min = 0;
2020         int mid;
2021
2022         if (ucs < table[0].first || ucs > table[max].last)
2023                 return 0;
2024         while (max >= min) {
2025                 mid = (min + max) / 2;
2026                 if (ucs > table[mid].last)
2027                         min = mid + 1;
2028                 else if (ucs < table[mid].first)
2029                         max = mid - 1;
2030                 else
2031                         return 1;
2032         }
2033         return 0;
2034 }
2035
2036 static int is_double_width(uint32_t ucs)
2037 {
2038         static const struct interval double_width[] = {
2039                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2040                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2041                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2042                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2043         };
2044         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2045 }
2046
2047 /* acquires console_sem */
2048 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2049 {
2050 #ifdef VT_BUF_VRAM_ONLY
2051 #define FLUSH do { } while(0);
2052 #else
2053 #define FLUSH if (draw_x >= 0) { \
2054         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2055         draw_x = -1; \
2056         }
2057 #endif
2058
2059         int c, tc, ok, n = 0, draw_x = -1;
2060         unsigned int currcons;
2061         unsigned long draw_from = 0, draw_to = 0;
2062         struct vc_data *vc;
2063         unsigned char vc_attr;
2064         struct vt_notifier_param param;
2065         uint8_t rescan;
2066         uint8_t inverse;
2067         uint8_t width;
2068         u16 himask, charmask;
2069         const unsigned char *orig_buf = NULL;
2070         int orig_count;
2071
2072         if (in_interrupt())
2073                 return count;
2074
2075         might_sleep();
2076
2077         acquire_console_sem();
2078         vc = tty->driver_data;
2079         if (vc == NULL) {
2080                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2081                 release_console_sem();
2082                 return 0;
2083         }
2084
2085         currcons = vc->vc_num;
2086         if (!vc_cons_allocated(currcons)) {
2087             /* could this happen? */
2088             static int error = 0;
2089             if (!error) {
2090                 error = 1;
2091                 printk("con_write: tty %d not allocated\n", currcons+1);
2092             }
2093             release_console_sem();
2094             return 0;
2095         }
2096         release_console_sem();
2097
2098         orig_buf = buf;
2099         orig_count = count;
2100
2101         /* At this point 'buf' is guaranteed to be a kernel buffer
2102          * and therefore no access to userspace (and therefore sleeping)
2103          * will be needed.  The con_buf_mtx serializes all tty based
2104          * console rendering and vcs write/read operations.  We hold
2105          * the console spinlock during the entire write.
2106          */
2107
2108         acquire_console_sem();
2109
2110         vc = tty->driver_data;
2111         if (vc == NULL) {
2112                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2113                 release_console_sem();
2114                 goto out;
2115         }
2116
2117         himask = vc->vc_hi_font_mask;
2118         charmask = himask ? 0x1ff : 0xff;
2119
2120         /* undraw cursor first */
2121         if (IS_FG(vc))
2122                 hide_cursor(vc);
2123
2124         param.vc = vc;
2125
2126         while (!tty->stopped && count) {
2127                 int orig = *buf;
2128                 c = orig;
2129                 buf++;
2130                 n++;
2131                 count--;
2132                 rescan = 0;
2133                 inverse = 0;
2134                 width = 1;
2135
2136                 /* Do no translation at all in control states */
2137                 if (vc->vc_state != ESnormal) {
2138                         tc = c;
2139                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2140                     /* Combine UTF-8 into Unicode in vc_utf_char.
2141                      * vc_utf_count is the number of continuation bytes still
2142                      * expected to arrive.
2143                      * vc_npar is the number of continuation bytes arrived so
2144                      * far
2145                      */
2146 rescan_last_byte:
2147                     if ((c & 0xc0) == 0x80) {
2148                         /* Continuation byte received */
2149                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2150                         if (vc->vc_utf_count) {
2151                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2152                             vc->vc_npar++;
2153                             if (--vc->vc_utf_count) {
2154                                 /* Still need some bytes */
2155                                 continue;
2156                             }
2157                             /* Got a whole character */
2158                             c = vc->vc_utf_char;
2159                             /* Reject overlong sequences */
2160                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2161                                         c > utf8_length_changes[vc->vc_npar])
2162                                 c = 0xfffd;
2163                         } else {
2164                             /* Unexpected continuation byte */
2165                             vc->vc_utf_count = 0;
2166                             c = 0xfffd;
2167                         }
2168                     } else {
2169                         /* Single ASCII byte or first byte of a sequence received */
2170                         if (vc->vc_utf_count) {
2171                             /* Continuation byte expected */
2172                             rescan = 1;
2173                             vc->vc_utf_count = 0;
2174                             c = 0xfffd;
2175                         } else if (c > 0x7f) {
2176                             /* First byte of a multibyte sequence received */
2177                             vc->vc_npar = 0;
2178                             if ((c & 0xe0) == 0xc0) {
2179                                 vc->vc_utf_count = 1;
2180                                 vc->vc_utf_char = (c & 0x1f);
2181                             } else if ((c & 0xf0) == 0xe0) {
2182                                 vc->vc_utf_count = 2;
2183                                 vc->vc_utf_char = (c & 0x0f);
2184                             } else if ((c & 0xf8) == 0xf0) {
2185                                 vc->vc_utf_count = 3;
2186                                 vc->vc_utf_char = (c & 0x07);
2187                             } else if ((c & 0xfc) == 0xf8) {
2188                                 vc->vc_utf_count = 4;
2189                                 vc->vc_utf_char = (c & 0x03);
2190                             } else if ((c & 0xfe) == 0xfc) {
2191                                 vc->vc_utf_count = 5;
2192                                 vc->vc_utf_char = (c & 0x01);
2193                             } else {
2194                                 /* 254 and 255 are invalid */
2195                                 c = 0xfffd;
2196                             }
2197                             if (vc->vc_utf_count) {
2198                                 /* Still need some bytes */
2199                                 continue;
2200                             }
2201                         }
2202                         /* Nothing to do if an ASCII byte was received */
2203                     }
2204                     /* End of UTF-8 decoding. */
2205                     /* c is the received character, or U+FFFD for invalid sequences. */
2206                     /* Replace invalid Unicode code points with U+FFFD too */
2207                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2208                         c = 0xfffd;
2209                     tc = c;
2210                 } else {        /* no utf or alternate charset mode */
2211                     tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2212                 }
2213
2214                 param.c = tc;
2215                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2216                                         &param) == NOTIFY_STOP)
2217                         continue;
2218
2219                 /* If the original code was a control character we
2220                  * only allow a glyph to be displayed if the code is
2221                  * not normally used (such as for cursor movement) or
2222                  * if the disp_ctrl mode has been explicitly enabled.
2223                  * Certain characters (as given by the CTRL_ALWAYS
2224                  * bitmap) are always displayed as control characters,
2225                  * as the console would be pretty useless without
2226                  * them; to display an arbitrary font position use the
2227                  * direct-to-font zone in UTF-8 mode.
2228                  */
2229                 ok = tc && (c >= 32 ||
2230                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2231                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2232                         && (c != 127 || vc->vc_disp_ctrl)
2233                         && (c != 128+27);
2234
2235                 if (vc->vc_state == ESnormal && ok) {
2236                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2237                                 if (is_double_width(c))
2238                                         width = 2;
2239                         }
2240                         /* Now try to find out how to display it */
2241                         tc = conv_uni_to_pc(vc, tc);
2242                         if (tc & ~charmask) {
2243                                 if (tc == -1 || tc == -2) {
2244                                     continue; /* nothing to display */
2245                                 }
2246                                 /* Glyph not found */
2247                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2248                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2249                                        This would make absolutely no sense with Unicode in mind,
2250                                        but do this for ASCII characters since a font may lack
2251                                        Unicode mapping info and we don't want to end up with
2252                                        having question marks only. */
2253                                     tc = c;
2254                                 } else {
2255                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2256                                     tc = conv_uni_to_pc(vc, 0xfffd);
2257                                     if (tc < 0) {
2258                                         inverse = 1;
2259                                         tc = conv_uni_to_pc(vc, '?');
2260                                         if (tc < 0) tc = '?';
2261                                     }
2262                                 }
2263                         }
2264
2265                         if (!inverse) {
2266                                 vc_attr = vc->vc_attr;
2267                         } else {
2268                                 /* invert vc_attr */
2269                                 if (!vc->vc_can_do_color) {
2270                                         vc_attr = (vc->vc_attr) ^ 0x08;
2271                                 } else if (vc->vc_hi_font_mask == 0x100) {
2272                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2273                                 } else {
2274                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2275                                 }
2276                                 FLUSH
2277                         }
2278
2279                         while (1) {
2280                                 if (vc->vc_need_wrap || vc->vc_decim)
2281                                         FLUSH
2282                                 if (vc->vc_need_wrap) {
2283                                         cr(vc);
2284                                         lf(vc);
2285                                 }
2286                                 if (vc->vc_decim)
2287                                         insert_char(vc, 1);
2288                                 scr_writew(himask ?
2289                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2290                                              (vc_attr << 8) + tc,
2291                                            (u16 *) vc->vc_pos);
2292                                 if (DO_UPDATE(vc) && draw_x < 0) {
2293                                         draw_x = vc->vc_x;
2294                                         draw_from = vc->vc_pos;
2295                                 }
2296                                 if (vc->vc_x == vc->vc_cols - 1) {
2297                                         vc->vc_need_wrap = vc->vc_decawm;
2298                                         draw_to = vc->vc_pos + 2;
2299                                 } else {
2300                                         vc->vc_x++;
2301                                         draw_to = (vc->vc_pos += 2);
2302                                 }
2303
2304                                 if (!--width) break;
2305
2306                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2307                                 if (tc < 0) tc = ' ';
2308                         }
2309                         notify_write(vc, c);
2310
2311                         if (inverse) {
2312                                 FLUSH
2313                         }
2314
2315                         if (rescan) {
2316                                 rescan = 0;
2317                                 inverse = 0;
2318                                 width = 1;
2319                                 c = orig;
2320                                 goto rescan_last_byte;
2321                         }
2322                         continue;
2323                 }
2324                 FLUSH
2325                 do_con_trol(tty, vc, orig);
2326         }
2327         FLUSH
2328         console_conditional_schedule();
2329         release_console_sem();
2330
2331 out:
2332         notify_update(vc);
2333         return n;
2334 #undef FLUSH
2335 }
2336
2337 /*
2338  * This is the console switching callback.
2339  *
2340  * Doing console switching in a process context allows
2341  * us to do the switches asynchronously (needed when we want
2342  * to switch due to a keyboard interrupt).  Synchronization
2343  * with other console code and prevention of re-entrancy is
2344  * ensured with console_sem.
2345  */
2346 static void console_callback(struct work_struct *ignored)
2347 {
2348         acquire_console_sem();
2349
2350         if (want_console >= 0) {
2351                 if (want_console != fg_console &&
2352                     vc_cons_allocated(want_console)) {
2353                         hide_cursor(vc_cons[fg_console].d);
2354                         change_console(vc_cons[want_console].d);
2355                         /* we only changed when the console had already
2356                            been allocated - a new console is not created
2357                            in an interrupt routine */
2358                 }
2359                 want_console = -1;
2360         }
2361         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2362                 do_poke_blanked_console = 0;
2363                 poke_blanked_console();
2364         }
2365         if (scrollback_delta) {
2366                 struct vc_data *vc = vc_cons[fg_console].d;
2367                 clear_selection();
2368                 if (vc->vc_mode == KD_TEXT)
2369                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2370                 scrollback_delta = 0;
2371         }
2372         if (blank_timer_expired) {
2373                 do_blank_screen(0);
2374                 blank_timer_expired = 0;
2375         }
2376         notify_update(vc_cons[fg_console].d);
2377
2378         release_console_sem();
2379 }
2380
2381 int set_console(int nr)
2382 {
2383         struct vc_data *vc = vc_cons[fg_console].d;
2384
2385         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2386                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2387
2388                 /*
2389                  * Console switch will fail in console_callback() or
2390                  * change_console() so there is no point scheduling
2391                  * the callback
2392                  *
2393                  * Existing set_console() users don't check the return
2394                  * value so this shouldn't break anything
2395                  */
2396                 return -EINVAL;
2397         }
2398
2399         want_console = nr;
2400         schedule_console_callback();
2401
2402         return 0;
2403 }
2404
2405 struct tty_driver *console_driver;
2406
2407 #ifdef CONFIG_VT_CONSOLE
2408
2409 /*
2410  *      Console on virtual terminal
2411  *
2412  * The console must be locked when we get here.
2413  */
2414
2415 static void vt_console_print(struct console *co, const char *b, unsigned count)
2416 {
2417         struct vc_data *vc = vc_cons[fg_console].d;
2418         unsigned char c;
2419         static DEFINE_SPINLOCK(printing_lock);
2420         const ushort *start;
2421         ushort cnt = 0;
2422         ushort myx;
2423
2424         /* console busy or not yet initialized */
2425         if (!printable)
2426                 return;
2427         if (!spin_trylock(&printing_lock))
2428                 return;
2429
2430         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2431                 vc = vc_cons[kmsg_redirect - 1].d;
2432
2433         /* read `x' only after setting currcons properly (otherwise
2434            the `x' macro will read the x of the foreground console). */
2435         myx = vc->vc_x;
2436
2437         if (!vc_cons_allocated(fg_console)) {
2438                 /* impossible */
2439                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2440                 goto quit;
2441         }
2442
2443         if (vc->vc_mode != KD_TEXT)
2444                 goto quit;
2445
2446         /* undraw cursor first */
2447         if (IS_FG(vc))
2448                 hide_cursor(vc);
2449
2450         start = (ushort *)vc->vc_pos;
2451
2452         /* Contrived structure to try to emulate original need_wrap behaviour
2453          * Problems caused when we have need_wrap set on '\n' character */
2454         while (count--) {
2455                 c = *b++;
2456                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2457                         if (cnt > 0) {
2458                                 if (CON_IS_VISIBLE(vc))
2459                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2460                                 vc->vc_x += cnt;
2461                                 if (vc->vc_need_wrap)
2462                                         vc->vc_x--;
2463                                 cnt = 0;
2464                         }
2465                         if (c == 8) {           /* backspace */
2466                                 bs(vc);
2467                                 start = (ushort *)vc->vc_pos;
2468                                 myx = vc->vc_x;
2469                                 continue;
2470                         }
2471                         if (c != 13)
2472                                 lf(vc);
2473                         cr(vc);
2474                         start = (ushort *)vc->vc_pos;
2475                         myx = vc->vc_x;
2476                         if (c == 10 || c == 13)
2477                                 continue;
2478                 }
2479                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2480                 notify_write(vc, c);
2481                 cnt++;
2482                 if (myx == vc->vc_cols - 1) {
2483                         vc->vc_need_wrap = 1;
2484                         continue;
2485                 }
2486                 vc->vc_pos += 2;
2487                 myx++;
2488         }
2489         if (cnt > 0) {
2490                 if (CON_IS_VISIBLE(vc))
2491                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2492                 vc->vc_x += cnt;
2493                 if (vc->vc_x == vc->vc_cols) {
2494                         vc->vc_x--;
2495                         vc->vc_need_wrap = 1;
2496                 }
2497         }
2498         set_cursor(vc);
2499         notify_update(vc);
2500
2501 quit:
2502         spin_unlock(&printing_lock);
2503 }
2504
2505 static struct tty_driver *vt_console_device(struct console *c, int *index)
2506 {
2507         *index = c->index ? c->index-1 : fg_console;
2508         return console_driver;
2509 }
2510
2511 static struct console vt_console_driver = {
2512         .name           = "tty",
2513         .write          = vt_console_print,
2514         .device         = vt_console_device,
2515         .unblank        = unblank_screen,
2516         .flags          = CON_PRINTBUFFER,
2517         .index          = -1,
2518 };
2519 #endif
2520
2521 /*
2522  *      Handling of Linux-specific VC ioctls
2523  */
2524
2525 /*
2526  * Generally a bit racy with respect to console_sem().
2527  *
2528  * There are some functions which don't need it.
2529  *
2530  * There are some functions which can sleep for arbitrary periods
2531  * (paste_selection) but we don't need the lock there anyway.
2532  *
2533  * set_selection has locking, and definitely needs it
2534  */
2535
2536 int tioclinux(struct tty_struct *tty, unsigned long arg)
2537 {
2538         char type, data;
2539         char __user *p = (char __user *)arg;
2540         int lines;
2541         int ret;
2542
2543         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2544                 return -EINVAL;
2545         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2546                 return -EPERM;
2547         if (get_user(type, p))
2548                 return -EFAULT;
2549         ret = 0;
2550
2551         lock_kernel();
2552
2553         switch (type)
2554         {
2555                 case TIOCL_SETSEL:
2556                         acquire_console_sem();
2557                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2558                         release_console_sem();
2559                         break;
2560                 case TIOCL_PASTESEL:
2561                         ret = paste_selection(tty);
2562                         break;
2563                 case TIOCL_UNBLANKSCREEN:
2564                         acquire_console_sem();
2565                         unblank_screen();
2566                         release_console_sem();
2567                         break;
2568                 case TIOCL_SELLOADLUT:
2569                         ret = sel_loadlut(p);
2570                         break;
2571                 case TIOCL_GETSHIFTSTATE:
2572
2573         /*
2574          * Make it possible to react to Shift+Mousebutton.
2575          * Note that 'shift_state' is an undocumented
2576          * kernel-internal variable; programs not closely
2577          * related to the kernel should not use this.
2578          */
2579                         data = shift_state;
2580                         ret = __put_user(data, p);
2581                         break;
2582                 case TIOCL_GETMOUSEREPORTING:
2583                         data = mouse_reporting();
2584                         ret = __put_user(data, p);
2585                         break;
2586                 case TIOCL_SETVESABLANK:
2587                         ret = set_vesa_blanking(p);
2588                         break;
2589                 case TIOCL_GETKMSGREDIRECT:
2590                         data = kmsg_redirect;
2591                         ret = __put_user(data, p);
2592                         break;
2593                 case TIOCL_SETKMSGREDIRECT:
2594                         if (!capable(CAP_SYS_ADMIN)) {
2595                                 ret = -EPERM;
2596                         } else {
2597                                 if (get_user(data, p+1))
2598                                         ret = -EFAULT;
2599                                 else
2600                                         kmsg_redirect = data;
2601                         }
2602                         break;
2603                 case TIOCL_GETFGCONSOLE:
2604                         ret = fg_console;
2605                         break;
2606                 case TIOCL_SCROLLCONSOLE:
2607                         if (get_user(lines, (s32 __user *)(p+4))) {
2608                                 ret = -EFAULT;
2609                         } else {
2610                                 scrollfront(vc_cons[fg_console].d, lines);
2611                                 ret = 0;
2612                         }
2613                         break;
2614                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2615                         acquire_console_sem();
2616                         ignore_poke = 1;
2617                         do_blank_screen(0);
2618                         release_console_sem();
2619                         break;
2620                 case TIOCL_BLANKEDSCREEN:
2621                         ret = console_blanked;
2622                         break;
2623                 default:
2624                         ret = -EINVAL;
2625                         break;
2626         }
2627         unlock_kernel();
2628         return ret;
2629 }
2630
2631 /*
2632  * /dev/ttyN handling
2633  */
2634
2635 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2636 {
2637         int     retval;
2638
2639         retval = do_con_write(tty, buf, count);
2640         con_flush_chars(tty);
2641
2642         return retval;
2643 }
2644
2645 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2646 {
2647         if (in_interrupt())
2648                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2649         return do_con_write(tty, &ch, 1);
2650 }
2651
2652 static int con_write_room(struct tty_struct *tty)
2653 {
2654         if (tty->stopped)
2655                 return 0;
2656         return 4096;            /* No limit, really; we're not buffering */
2657 }
2658
2659 static int con_chars_in_buffer(struct tty_struct *tty)
2660 {
2661         return 0;               /* we're not buffering */
2662 }
2663
2664 /*
2665  * con_throttle and con_unthrottle are only used for
2666  * paste_selection(), which has to stuff in a large number of
2667  * characters...
2668  */
2669 static void con_throttle(struct tty_struct *tty)
2670 {
2671 }
2672
2673 static void con_unthrottle(struct tty_struct *tty)
2674 {
2675         struct vc_data *vc = tty->driver_data;
2676
2677         wake_up_interruptible(&vc->paste_wait);
2678 }
2679
2680 /*
2681  * Turn the Scroll-Lock LED on when the tty is stopped
2682  */
2683 static void con_stop(struct tty_struct *tty)
2684 {
2685         int console_num;
2686         if (!tty)
2687                 return;
2688         console_num = tty->index;
2689         if (!vc_cons_allocated(console_num))
2690                 return;
2691         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2692         set_leds();
2693 }
2694
2695 /*
2696  * Turn the Scroll-Lock LED off when the console is started
2697  */
2698 static void con_start(struct tty_struct *tty)
2699 {
2700         int console_num;
2701         if (!tty)
2702                 return;
2703         console_num = tty->index;
2704         if (!vc_cons_allocated(console_num))
2705                 return;
2706         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2707         set_leds();
2708 }
2709
2710 static void con_flush_chars(struct tty_struct *tty)
2711 {
2712         struct vc_data *vc;
2713
2714         if (in_interrupt())     /* from flush_to_ldisc */
2715                 return;
2716
2717         /* if we race with con_close(), vt may be null */
2718         acquire_console_sem();
2719         vc = tty->driver_data;
2720         if (vc)
2721                 set_cursor(vc);
2722         release_console_sem();
2723 }
2724
2725 /*
2726  * Allocate the console screen memory.
2727  */
2728 static int con_open(struct tty_struct *tty, struct file *filp)
2729 {
2730         unsigned int currcons = tty->index;
2731         int ret = 0;
2732
2733         acquire_console_sem();
2734         if (tty->driver_data == NULL) {
2735                 ret = vc_allocate(currcons);
2736                 if (ret == 0) {
2737                         struct vc_data *vc = vc_cons[currcons].d;
2738                         tty->driver_data = vc;
2739                         vc->vc_tty = tty;
2740
2741                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2742                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2743                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2744                         }
2745                         release_console_sem();
2746                         vcs_make_sysfs(tty);
2747                         return ret;
2748                 }
2749         }
2750         release_console_sem();
2751         return ret;
2752 }
2753
2754 /*
2755  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2756  * and taking a ref against the tty while we're in the process of forgetting
2757  * about it and cleaning things up.
2758  *
2759  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2760  */
2761 static void con_close(struct tty_struct *tty, struct file *filp)
2762 {
2763         mutex_lock(&tty_mutex);
2764         acquire_console_sem();
2765         if (tty && tty->count == 1) {
2766                 struct vc_data *vc = tty->driver_data;
2767
2768                 if (vc)
2769                         vc->vc_tty = NULL;
2770                 tty->driver_data = NULL;
2771                 release_console_sem();
2772                 vcs_remove_sysfs(tty);
2773                 mutex_unlock(&tty_mutex);
2774                 /*
2775                  * tty_mutex is released, but we still hold BKL, so there is
2776                  * still exclusion against init_dev()
2777                  */
2778                 return;
2779         }
2780         release_console_sem();
2781         mutex_unlock(&tty_mutex);
2782 }
2783
2784 static int default_italic_color    = 2; // green (ASCII)
2785 static int default_underline_color = 3; // cyan (ASCII)
2786 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2787 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2788
2789 static void vc_init(struct vc_data *vc, unsigned int rows,
2790                     unsigned int cols, int do_clear)
2791 {
2792         int j, k ;
2793
2794         vc->vc_cols = cols;
2795         vc->vc_rows = rows;
2796         vc->vc_size_row = cols << 1;
2797         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2798
2799         set_origin(vc);
2800         vc->vc_pos = vc->vc_origin;
2801         reset_vc(vc);
2802         for (j=k=0; j<16; j++) {
2803                 vc->vc_palette[k++] = default_red[j] ;
2804                 vc->vc_palette[k++] = default_grn[j] ;
2805                 vc->vc_palette[k++] = default_blu[j] ;
2806         }
2807         vc->vc_def_color       = 0x07;   /* white */
2808         vc->vc_ulcolor         = default_underline_color;
2809         vc->vc_itcolor         = default_italic_color;
2810         vc->vc_halfcolor       = 0x08;   /* grey */
2811         init_waitqueue_head(&vc->paste_wait);
2812         reset_terminal(vc, do_clear);
2813 }
2814
2815 /*
2816  * This routine initializes console interrupts, and does nothing
2817  * else. If you want the screen to clear, call tty_write with
2818  * the appropriate escape-sequence.
2819  */
2820
2821 static int __init con_init(void)
2822 {
2823         const char *display_desc = NULL;
2824         struct vc_data *vc;
2825         unsigned int currcons = 0, i;
2826
2827         acquire_console_sem();
2828
2829         if (conswitchp)
2830                 display_desc = conswitchp->con_startup();
2831         if (!display_desc) {
2832                 fg_console = 0;
2833                 release_console_sem();
2834                 return 0;
2835         }
2836
2837         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2838                 struct con_driver *con_driver = &registered_con_driver[i];
2839
2840                 if (con_driver->con == NULL) {
2841                         con_driver->con = conswitchp;
2842                         con_driver->desc = display_desc;
2843                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2844                         con_driver->first = 0;
2845                         con_driver->last = MAX_NR_CONSOLES - 1;
2846                         break;
2847                 }
2848         }
2849
2850         for (i = 0; i < MAX_NR_CONSOLES; i++)
2851                 con_driver_map[i] = conswitchp;
2852
2853         if (blankinterval) {
2854                 blank_state = blank_normal_wait;
2855                 mod_timer(&console_timer, jiffies + blankinterval);
2856         }
2857
2858         /*
2859          * kmalloc is not running yet - we use the bootmem allocator.
2860          */
2861         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2862                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2863                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2864                 visual_init(vc, currcons, 1);
2865                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2866                 vc->vc_kmalloced = 0;
2867                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2868                         currcons || !vc->vc_sw->con_save_screen);
2869         }
2870         currcons = fg_console = 0;
2871         master_display_fg = vc = vc_cons[currcons].d;
2872         set_origin(vc);
2873         save_screen(vc);
2874         gotoxy(vc, vc->vc_x, vc->vc_y);
2875         csi_J(vc, 0);
2876         update_screen(vc);
2877         printk("Console: %s %s %dx%d",
2878                 vc->vc_can_do_color ? "colour" : "mono",
2879                 display_desc, vc->vc_cols, vc->vc_rows);
2880         printable = 1;
2881         printk("\n");
2882
2883         release_console_sem();
2884
2885 #ifdef CONFIG_VT_CONSOLE
2886         register_console(&vt_console_driver);
2887 #endif
2888         return 0;
2889 }
2890 console_initcall(con_init);
2891
2892 static const struct tty_operations con_ops = {
2893         .open = con_open,
2894         .close = con_close,
2895         .write = con_write,
2896         .write_room = con_write_room,
2897         .put_char = con_put_char,
2898         .flush_chars = con_flush_chars,
2899         .chars_in_buffer = con_chars_in_buffer,
2900         .ioctl = vt_ioctl,
2901         .stop = con_stop,
2902         .start = con_start,
2903         .throttle = con_throttle,
2904         .unthrottle = con_unthrottle,
2905 };
2906
2907 int __init vty_init(void)
2908 {
2909         vcs_init();
2910
2911         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2912         if (!console_driver)
2913                 panic("Couldn't allocate console driver\n");
2914         console_driver->owner = THIS_MODULE;
2915         console_driver->name = "tty";
2916         console_driver->name_base = 1;
2917         console_driver->major = TTY_MAJOR;
2918         console_driver->minor_start = 1;
2919         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2920         console_driver->init_termios = tty_std_termios;
2921         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2922         tty_set_operations(console_driver, &con_ops);
2923         if (tty_register_driver(console_driver))
2924                 panic("Couldn't register console driver\n");
2925
2926         kbd_init();
2927         console_map_init();
2928 #ifdef CONFIG_PROM_CONSOLE
2929         prom_con_init();
2930 #endif
2931 #ifdef CONFIG_MDA_CONSOLE
2932         mda_console_init();
2933 #endif
2934         return 0;
2935 }
2936
2937 #ifndef VT_SINGLE_DRIVER
2938 #include <linux/device.h>
2939
2940 static struct class *vtconsole_class;
2941
2942 static int bind_con_driver(const struct consw *csw, int first, int last,
2943                            int deflt)
2944 {
2945         struct module *owner = csw->owner;
2946         const char *desc = NULL;
2947         struct con_driver *con_driver;
2948         int i, j = -1, k = -1, retval = -ENODEV;
2949
2950         if (!try_module_get(owner))
2951                 return -ENODEV;
2952
2953         acquire_console_sem();
2954
2955         /* check if driver is registered */
2956         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2957                 con_driver = &registered_con_driver[i];
2958
2959                 if (con_driver->con == csw) {
2960                         desc = con_driver->desc;
2961                         retval = 0;
2962                         break;
2963                 }
2964         }
2965
2966         if (retval)
2967                 goto err;
2968
2969         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2970                 csw->con_startup();
2971                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2972         }
2973
2974         if (deflt) {
2975                 if (conswitchp)
2976                         module_put(conswitchp->owner);
2977
2978                 __module_get(owner);
2979                 conswitchp = csw;
2980         }
2981
2982         first = max(first, con_driver->first);
2983         last = min(last, con_driver->last);
2984
2985         for (i = first; i <= last; i++) {
2986                 int old_was_color;
2987                 struct vc_data *vc = vc_cons[i].d;
2988
2989                 if (con_driver_map[i])
2990                         module_put(con_driver_map[i]->owner);
2991                 __module_get(owner);
2992                 con_driver_map[i] = csw;
2993
2994                 if (!vc || !vc->vc_sw)
2995                         continue;
2996
2997                 j = i;
2998
2999                 if (CON_IS_VISIBLE(vc)) {
3000                         k = i;
3001                         save_screen(vc);
3002                 }
3003
3004                 old_was_color = vc->vc_can_do_color;
3005                 vc->vc_sw->con_deinit(vc);
3006                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3007                 visual_init(vc, i, 0);
3008                 set_origin(vc);
3009                 update_attr(vc);
3010
3011                 /* If the console changed between mono <-> color, then
3012                  * the attributes in the screenbuf will be wrong.  The
3013                  * following resets all attributes to something sane.
3014                  */
3015                 if (old_was_color != vc->vc_can_do_color)
3016                         clear_buffer_attributes(vc);
3017         }
3018
3019         printk("Console: switching ");
3020         if (!deflt)
3021                 printk("consoles %d-%d ", first+1, last+1);
3022         if (j >= 0) {
3023                 struct vc_data *vc = vc_cons[j].d;
3024
3025                 printk("to %s %s %dx%d\n",
3026                        vc->vc_can_do_color ? "colour" : "mono",
3027                        desc, vc->vc_cols, vc->vc_rows);
3028
3029                 if (k >= 0) {
3030                         vc = vc_cons[k].d;
3031                         update_screen(vc);
3032                 }
3033         } else
3034                 printk("to %s\n", desc);
3035
3036         retval = 0;
3037 err:
3038         release_console_sem();
3039         module_put(owner);
3040         return retval;
3041 };
3042
3043 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3044 static int con_is_graphics(const struct consw *csw, int first, int last)
3045 {
3046         int i, retval = 0;
3047
3048         for (i = first; i <= last; i++) {
3049                 struct vc_data *vc = vc_cons[i].d;
3050
3051                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3052                         retval = 1;
3053                         break;
3054                 }
3055         }
3056
3057         return retval;
3058 }
3059
3060 /**
3061  * unbind_con_driver - unbind a console driver
3062  * @csw: pointer to console driver to unregister
3063  * @first: first in range of consoles that @csw should be unbound from
3064  * @last: last in range of consoles that @csw should be unbound from
3065  * @deflt: should next bound console driver be default after @csw is unbound?
3066  *
3067  * To unbind a driver from all possible consoles, pass 0 as @first and
3068  * %MAX_NR_CONSOLES as @last.
3069  *
3070  * @deflt controls whether the console that ends up replacing @csw should be
3071  * the default console.
3072  *
3073  * RETURNS:
3074  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3075  * or 0 on success.
3076  */
3077 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3078 {
3079         struct module *owner = csw->owner;
3080         const struct consw *defcsw = NULL;
3081         struct con_driver *con_driver = NULL, *con_back = NULL;
3082         int i, retval = -ENODEV;
3083
3084         if (!try_module_get(owner))
3085                 return -ENODEV;
3086
3087         acquire_console_sem();
3088
3089         /* check if driver is registered and if it is unbindable */
3090         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3091                 con_driver = &registered_con_driver[i];
3092
3093                 if (con_driver->con == csw &&
3094                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3095                         retval = 0;
3096                         break;
3097                 }
3098         }
3099
3100         if (retval) {
3101                 release_console_sem();
3102                 goto err;
3103         }
3104
3105         retval = -ENODEV;
3106
3107         /* check if backup driver exists */
3108         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3109                 con_back = &registered_con_driver[i];
3110
3111                 if (con_back->con &&
3112                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3113                         defcsw = con_back->con;
3114                         retval = 0;
3115                         break;
3116                 }
3117         }
3118
3119         if (retval) {
3120                 release_console_sem();
3121                 goto err;
3122         }
3123
3124         if (!con_is_bound(csw)) {
3125                 release_console_sem();
3126                 goto err;
3127         }
3128
3129         first = max(first, con_driver->first);
3130         last = min(last, con_driver->last);
3131
3132         for (i = first; i <= last; i++) {
3133                 if (con_driver_map[i] == csw) {
3134                         module_put(csw->owner);
3135                         con_driver_map[i] = NULL;
3136                 }
3137         }
3138
3139         if (!con_is_bound(defcsw)) {
3140                 const struct consw *defconsw = conswitchp;
3141
3142                 defcsw->con_startup();
3143                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3144                 /*
3145                  * vgacon may change the default driver to point
3146                  * to dummycon, we restore it here...
3147                  */
3148                 conswitchp = defconsw;
3149         }
3150
3151         if (!con_is_bound(csw))
3152                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3153
3154         release_console_sem();
3155         /* ignore return value, binding should not fail */
3156         bind_con_driver(defcsw, first, last, deflt);
3157 err:
3158         module_put(owner);
3159         return retval;
3160
3161 }
3162 EXPORT_SYMBOL(unbind_con_driver);
3163
3164 static int vt_bind(struct con_driver *con)
3165 {
3166         const struct consw *defcsw = NULL, *csw = NULL;
3167         int i, more = 1, first = -1, last = -1, deflt = 0;
3168
3169         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3170             con_is_graphics(con->con, con->first, con->last))
3171                 goto err;
3172
3173         csw = con->con;
3174
3175         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3176                 struct con_driver *con = &registered_con_driver[i];
3177
3178                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3179                         defcsw = con->con;
3180                         break;
3181                 }
3182         }
3183
3184         if (!defcsw)
3185                 goto err;
3186
3187         while (more) {
3188                 more = 0;
3189
3190                 for (i = con->first; i <= con->last; i++) {
3191                         if (con_driver_map[i] == defcsw) {
3192                                 if (first == -1)
3193                                         first = i;
3194                                 last = i;
3195                                 more = 1;
3196                         } else if (first != -1)
3197                                 break;
3198                 }
3199
3200                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3201                         deflt = 1;
3202
3203                 if (first != -1)
3204                         bind_con_driver(csw, first, last, deflt);
3205
3206                 first = -1;
3207                 last = -1;
3208                 deflt = 0;
3209         }
3210
3211 err:
3212         return 0;
3213 }
3214
3215 static int vt_unbind(struct con_driver *con)
3216 {
3217         const struct consw *csw = NULL;
3218         int i, more = 1, first = -1, last = -1, deflt = 0;
3219
3220         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3221             con_is_graphics(con->con, con->first, con->last))
3222                 goto err;
3223
3224         csw = con->con;
3225
3226         while (more) {
3227                 more = 0;
3228
3229                 for (i = con->first; i <= con->last; i++) {
3230                         if (con_driver_map[i] == csw) {
3231                                 if (first == -1)
3232                                         first = i;
3233                                 last = i;
3234                                 more = 1;
3235                         } else if (first != -1)
3236                                 break;
3237                 }
3238
3239                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3240                         deflt = 1;
3241
3242                 if (first != -1)
3243                         unbind_con_driver(csw, first, last, deflt);
3244
3245                 first = -1;
3246                 last = -1;
3247                 deflt = 0;
3248         }
3249
3250 err:
3251         return 0;
3252 }
3253 #else
3254 static inline int vt_bind(struct con_driver *con)
3255 {
3256         return 0;
3257 }
3258 static inline int vt_unbind(struct con_driver *con)
3259 {
3260         return 0;
3261 }
3262 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3263
3264 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3265                           const char *buf, size_t count)
3266 {
3267         struct con_driver *con = dev_get_drvdata(dev);
3268         int bind = simple_strtoul(buf, NULL, 0);
3269
3270         if (bind)
3271                 vt_bind(con);
3272         else
3273                 vt_unbind(con);
3274
3275         return count;
3276 }
3277
3278 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3279                          char *buf)
3280 {
3281         struct con_driver *con = dev_get_drvdata(dev);
3282         int bind = con_is_bound(con->con);
3283
3284         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3285 }
3286
3287 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3288                          char *buf)
3289 {
3290         struct con_driver *con = dev_get_drvdata(dev);
3291
3292         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3293                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3294                          con->desc);
3295
3296 }
3297
3298 static struct device_attribute device_attrs[] = {
3299         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3300         __ATTR(name, S_IRUGO, show_name, NULL),
3301 };
3302
3303 static int vtconsole_init_device(struct con_driver *con)
3304 {
3305         int i;
3306         int error = 0;
3307
3308         con->flag |= CON_DRIVER_FLAG_ATTR;
3309         dev_set_drvdata(con->dev, con);
3310         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3311                 error = device_create_file(con->dev, &device_attrs[i]);
3312                 if (error)
3313                         break;
3314         }
3315
3316         if (error) {
3317                 while (--i >= 0)
3318                         device_remove_file(con->dev, &device_attrs[i]);
3319                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3320         }
3321
3322         return error;
3323 }
3324
3325 static void vtconsole_deinit_device(struct con_driver *con)
3326 {
3327         int i;
3328
3329         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3330                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3331                         device_remove_file(con->dev, &device_attrs[i]);
3332                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3333         }
3334 }
3335
3336 /**
3337  * con_is_bound - checks if driver is bound to the console
3338  * @csw: console driver
3339  *
3340  * RETURNS: zero if unbound, nonzero if bound
3341  *
3342  * Drivers can call this and if zero, they should release
3343  * all resources allocated on con_startup()
3344  */
3345 int con_is_bound(const struct consw *csw)
3346 {
3347         int i, bound = 0;
3348
3349         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3350                 if (con_driver_map[i] == csw) {
3351                         bound = 1;
3352                         break;
3353                 }
3354         }
3355
3356         return bound;
3357 }
3358 EXPORT_SYMBOL(con_is_bound);
3359
3360 /**
3361  * register_con_driver - register console driver to console layer
3362  * @csw: console driver
3363  * @first: the first console to take over, minimum value is 0
3364  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3365  *
3366  * DESCRIPTION: This function registers a console driver which can later
3367  * bind to a range of consoles specified by @first and @last. It will
3368  * also initialize the console driver by calling con_startup().
3369  */
3370 int register_con_driver(const struct consw *csw, int first, int last)
3371 {
3372         struct module *owner = csw->owner;
3373         struct con_driver *con_driver;
3374         const char *desc;
3375         int i, retval = 0;
3376
3377         if (!try_module_get(owner))
3378                 return -ENODEV;
3379
3380         acquire_console_sem();
3381
3382         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3383                 con_driver = &registered_con_driver[i];
3384
3385                 /* already registered */
3386                 if (con_driver->con == csw)
3387                         retval = -EINVAL;
3388         }
3389
3390         if (retval)
3391                 goto err;
3392
3393         desc = csw->con_startup();
3394
3395         if (!desc)
3396                 goto err;
3397
3398         retval = -EINVAL;
3399
3400         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3401                 con_driver = &registered_con_driver[i];
3402
3403                 if (con_driver->con == NULL) {
3404                         con_driver->con = csw;
3405                         con_driver->desc = desc;
3406                         con_driver->node = i;
3407                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3408                                            CON_DRIVER_FLAG_INIT;
3409                         con_driver->first = first;
3410                         con_driver->last = last;
3411                         retval = 0;
3412                         break;
3413                 }
3414         }
3415
3416         if (retval)
3417                 goto err;
3418
3419         con_driver->dev = device_create(vtconsole_class, NULL,
3420                                         MKDEV(0, con_driver->node),
3421                                         "vtcon%i", con_driver->node);
3422
3423         if (IS_ERR(con_driver->dev)) {
3424                 printk(KERN_WARNING "Unable to create device for %s; "
3425                        "errno = %ld\n", con_driver->desc,
3426                        PTR_ERR(con_driver->dev));
3427                 con_driver->dev = NULL;
3428         } else {
3429                 vtconsole_init_device(con_driver);
3430         }
3431
3432 err:
3433         release_console_sem();
3434         module_put(owner);
3435         return retval;
3436 }
3437 EXPORT_SYMBOL(register_con_driver);
3438
3439 /**
3440  * unregister_con_driver - unregister console driver from console layer
3441  * @csw: console driver
3442  *
3443  * DESCRIPTION: All drivers that registers to the console layer must
3444  * call this function upon exit, or if the console driver is in a state
3445  * where it won't be able to handle console services, such as the
3446  * framebuffer console without loaded framebuffer drivers.
3447  *
3448  * The driver must unbind first prior to unregistration.
3449  */
3450 int unregister_con_driver(const struct consw *csw)
3451 {
3452         int i, retval = -ENODEV;
3453
3454         acquire_console_sem();
3455
3456         /* cannot unregister a bound driver */
3457         if (con_is_bound(csw))
3458                 goto err;
3459
3460         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3461                 struct con_driver *con_driver = &registered_con_driver[i];
3462
3463                 if (con_driver->con == csw &&
3464                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3465                         vtconsole_deinit_device(con_driver);
3466                         device_destroy(vtconsole_class,
3467                                        MKDEV(0, con_driver->node));
3468                         con_driver->con = NULL;
3469                         con_driver->desc = NULL;
3470                         con_driver->dev = NULL;
3471                         con_driver->node = 0;
3472                         con_driver->flag = 0;
3473                         con_driver->first = 0;
3474                         con_driver->last = 0;
3475                         retval = 0;
3476                         break;
3477                 }
3478         }
3479 err:
3480         release_console_sem();
3481         return retval;
3482 }
3483 EXPORT_SYMBOL(unregister_con_driver);
3484
3485 /*
3486  *      If we support more console drivers, this function is used
3487  *      when a driver wants to take over some existing consoles
3488  *      and become default driver for newly opened ones.
3489  *
3490  *      take_over_console is basically a register followed by unbind
3491  */
3492 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3493 {
3494         int err;
3495
3496         err = register_con_driver(csw, first, last);
3497
3498         if (!err)
3499                 bind_con_driver(csw, first, last, deflt);
3500
3501         return err;
3502 }
3503
3504 /*
3505  * give_up_console is a wrapper to unregister_con_driver. It will only
3506  * work if driver is fully unbound.
3507  */
3508 void give_up_console(const struct consw *csw)
3509 {
3510         unregister_con_driver(csw);
3511 }
3512
3513 static int __init vtconsole_class_init(void)
3514 {
3515         int i;
3516
3517         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3518         if (IS_ERR(vtconsole_class)) {
3519                 printk(KERN_WARNING "Unable to create vt console class; "
3520                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3521                 vtconsole_class = NULL;
3522         }
3523
3524         /* Add system drivers to sysfs */
3525         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3526                 struct con_driver *con = &registered_con_driver[i];
3527
3528                 if (con->con && !con->dev) {
3529                         con->dev = device_create(vtconsole_class, NULL,
3530                                                  MKDEV(0, con->node),
3531                                                  "vtcon%i", con->node);
3532
3533                         if (IS_ERR(con->dev)) {
3534                                 printk(KERN_WARNING "Unable to create "
3535                                        "device for %s; errno = %ld\n",
3536                                        con->desc, PTR_ERR(con->dev));
3537                                 con->dev = NULL;
3538                         } else {
3539                                 vtconsole_init_device(con);
3540                         }
3541                 }
3542         }
3543
3544         return 0;
3545 }
3546 postcore_initcall(vtconsole_class_init);
3547
3548 #endif
3549
3550 /*
3551  *      Screen blanking
3552  */
3553
3554 static int set_vesa_blanking(char __user *p)
3555 {
3556         unsigned int mode;
3557
3558         if (get_user(mode, p + 1))
3559                 return -EFAULT;
3560
3561         vesa_blank_mode = (mode < 4) ? mode : 0;
3562         return 0;
3563 }
3564
3565 void do_blank_screen(int entering_gfx)
3566 {
3567         struct vc_data *vc = vc_cons[fg_console].d;
3568         int i;
3569
3570         WARN_CONSOLE_UNLOCKED();
3571
3572         if (console_blanked) {
3573                 if (blank_state == blank_vesa_wait) {
3574                         blank_state = blank_off;
3575                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3576                 }
3577                 return;
3578         }
3579
3580         /* entering graphics mode? */
3581         if (entering_gfx) {
3582                 hide_cursor(vc);
3583                 save_screen(vc);
3584                 vc->vc_sw->con_blank(vc, -1, 1);
3585                 console_blanked = fg_console + 1;
3586                 blank_state = blank_off;
3587                 set_origin(vc);
3588                 return;
3589         }
3590
3591         if (blank_state != blank_normal_wait)
3592                 return;
3593         blank_state = blank_off;
3594
3595         /* don't blank graphics */
3596         if (vc->vc_mode != KD_TEXT) {
3597                 console_blanked = fg_console + 1;
3598                 return;
3599         }
3600
3601         hide_cursor(vc);
3602         del_timer_sync(&console_timer);
3603         blank_timer_expired = 0;
3604
3605         save_screen(vc);
3606         /* In case we need to reset origin, blanking hook returns 1 */
3607         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3608         console_blanked = fg_console + 1;
3609         if (i)
3610                 set_origin(vc);
3611
3612         if (console_blank_hook && console_blank_hook(1))
3613                 return;
3614
3615         if (vesa_off_interval && vesa_blank_mode) {
3616                 blank_state = blank_vesa_wait;
3617                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3618         }
3619 }
3620 EXPORT_SYMBOL(do_blank_screen);
3621
3622 /*
3623  * Called by timer as well as from vt_console_driver
3624  */
3625 void do_unblank_screen(int leaving_gfx)
3626 {
3627         struct vc_data *vc;
3628
3629         /* This should now always be called from a "sane" (read: can schedule)
3630          * context for the sake of the low level drivers, except in the special
3631          * case of oops_in_progress
3632          */
3633         if (!oops_in_progress)
3634                 might_sleep();
3635
3636         WARN_CONSOLE_UNLOCKED();
3637
3638         ignore_poke = 0;
3639         if (!console_blanked)
3640                 return;
3641         if (!vc_cons_allocated(fg_console)) {
3642                 /* impossible */
3643                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3644                 return;
3645         }
3646         vc = vc_cons[fg_console].d;
3647         if (vc->vc_mode != KD_TEXT)
3648                 return; /* but leave console_blanked != 0 */
3649
3650         if (blankinterval) {
3651                 mod_timer(&console_timer, jiffies + blankinterval);
3652                 blank_state = blank_normal_wait;
3653         }
3654
3655         console_blanked = 0;
3656         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3657                 /* Low-level driver cannot restore -> do it ourselves */
3658                 update_screen(vc);
3659         if (console_blank_hook)
3660                 console_blank_hook(0);
3661         set_palette(vc);
3662         set_cursor(vc);
3663 }
3664 EXPORT_SYMBOL(do_unblank_screen);
3665
3666 /*
3667  * This is called by the outside world to cause a forced unblank, mostly for
3668  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3669  * call it with 1 as an argument and so force a mode restore... that may kill
3670  * X or at least garbage the screen but would also make the Oops visible...
3671  */
3672 void unblank_screen(void)
3673 {
3674         do_unblank_screen(0);
3675 }
3676
3677 /*
3678  * We defer the timer blanking to work queue so it can take the console mutex
3679  * (console operations can still happen at irq time, but only from printk which
3680  * has the console mutex. Not perfect yet, but better than no locking
3681  */
3682 static void blank_screen_t(unsigned long dummy)
3683 {
3684         if (unlikely(!keventd_up())) {
3685                 mod_timer(&console_timer, jiffies + blankinterval);
3686                 return;
3687         }
3688         blank_timer_expired = 1;
3689         schedule_work(&console_work);
3690 }
3691
3692 void poke_blanked_console(void)
3693 {
3694         WARN_CONSOLE_UNLOCKED();
3695
3696         /* Add this so we quickly catch whoever might call us in a non
3697          * safe context. Nowadays, unblank_screen() isn't to be called in
3698          * atomic contexts and is allowed to schedule (with the special case
3699          * of oops_in_progress, but that isn't of any concern for this
3700          * function. --BenH.
3701          */
3702         might_sleep();
3703
3704         /* This isn't perfectly race free, but a race here would be mostly harmless,
3705          * at worse, we'll do a spurrious blank and it's unlikely
3706          */
3707         del_timer(&console_timer);
3708         blank_timer_expired = 0;
3709
3710         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3711                 return;
3712         if (console_blanked)
3713                 unblank_screen();
3714         else if (blankinterval) {
3715                 mod_timer(&console_timer, jiffies + blankinterval);
3716                 blank_state = blank_normal_wait;
3717         }
3718 }
3719
3720 /*
3721  *      Palettes
3722  */
3723
3724 static void set_palette(struct vc_data *vc)
3725 {
3726         WARN_CONSOLE_UNLOCKED();
3727
3728         if (vc->vc_mode != KD_GRAPHICS)
3729                 vc->vc_sw->con_set_palette(vc, color_table);
3730 }
3731
3732 static int set_get_cmap(unsigned char __user *arg, int set)
3733 {
3734     int i, j, k;
3735
3736     WARN_CONSOLE_UNLOCKED();
3737
3738     for (i = 0; i < 16; i++)
3739         if (set) {
3740             get_user(default_red[i], arg++);
3741             get_user(default_grn[i], arg++);
3742             get_user(default_blu[i], arg++);
3743         } else {
3744             put_user(default_red[i], arg++);
3745             put_user(default_grn[i], arg++);
3746             put_user(default_blu[i], arg++);
3747         }
3748     if (set) {
3749         for (i = 0; i < MAX_NR_CONSOLES; i++)
3750             if (vc_cons_allocated(i)) {
3751                 for (j = k = 0; j < 16; j++) {
3752                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3753                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3754                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3755                 }
3756                 set_palette(vc_cons[i].d);
3757             }
3758     }
3759     return 0;
3760 }
3761
3762 /*
3763  * Load palette into the DAC registers. arg points to a colour
3764  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3765  */
3766
3767 int con_set_cmap(unsigned char __user *arg)
3768 {
3769         int rc;
3770
3771         acquire_console_sem();
3772         rc = set_get_cmap (arg,1);
3773         release_console_sem();
3774
3775         return rc;
3776 }
3777
3778 int con_get_cmap(unsigned char __user *arg)
3779 {
3780         int rc;
3781
3782         acquire_console_sem();
3783         rc = set_get_cmap (arg,0);
3784         release_console_sem();
3785
3786         return rc;
3787 }
3788
3789 void reset_palette(struct vc_data *vc)
3790 {
3791         int j, k;
3792         for (j=k=0; j<16; j++) {
3793                 vc->vc_palette[k++] = default_red[j];
3794                 vc->vc_palette[k++] = default_grn[j];
3795                 vc->vc_palette[k++] = default_blu[j];
3796         }
3797         set_palette(vc);
3798 }
3799
3800 /*
3801  *  Font switching
3802  *
3803  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3804  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 
3805  *  depending on width) reserved for each character which is kinda wasty, but 
3806  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It 
3807  *  is upto the actual low-level console-driver convert data into its favorite
3808  *  format (maybe we should add a `fontoffset' field to the `display'
3809  *  structure so we won't have to convert the fontdata all the time.
3810  *  /Jes
3811  */
3812
3813 #define max_font_size 65536
3814
3815 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3816 {
3817         struct console_font font;
3818         int rc = -EINVAL;
3819         int c;
3820
3821         if (vc->vc_mode != KD_TEXT)
3822                 return -EINVAL;
3823
3824         if (op->data) {
3825                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3826                 if (!font.data)
3827                         return -ENOMEM;
3828         } else
3829                 font.data = NULL;
3830
3831         acquire_console_sem();
3832         if (vc->vc_sw->con_font_get)
3833                 rc = vc->vc_sw->con_font_get(vc, &font);
3834         else
3835                 rc = -ENOSYS;
3836         release_console_sem();
3837
3838         if (rc)
3839                 goto out;
3840
3841         c = (font.width+7)/8 * 32 * font.charcount;
3842
3843         if (op->data && font.charcount > op->charcount)
3844                 rc = -ENOSPC;
3845         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3846                 if (font.width > op->width || font.height > op->height) 
3847                         rc = -ENOSPC;
3848         } else {
3849                 if (font.width != 8)
3850                         rc = -EIO;
3851                 else if ((op->height && font.height > op->height) ||
3852                          font.height > 32)
3853                         rc = -ENOSPC;
3854         }
3855         if (rc)
3856                 goto out;
3857
3858         op->height = font.height;
3859         op->width = font.width;
3860         op->charcount = font.charcount;
3861
3862         if (op->data && copy_to_user(op->data, font.data, c))
3863                 rc = -EFAULT;
3864
3865 out:
3866         kfree(font.data);
3867         return rc;
3868 }
3869
3870 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3871 {
3872         struct console_font font;
3873         int rc = -EINVAL;
3874         int size;
3875
3876         if (vc->vc_mode != KD_TEXT)
3877                 return -EINVAL;
3878         if (!op->data)
3879                 return -EINVAL;
3880         if (op->charcount > 512)
3881                 return -EINVAL;
3882         if (!op->height) {              /* Need to guess font height [compat] */
3883                 int h, i;
3884                 u8 __user *charmap = op->data;
3885                 u8 tmp;
3886                 
3887                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3888                    so that we can get rid of this soon */
3889                 if (!(op->flags & KD_FONT_FLAG_OLD))
3890                         return -EINVAL;
3891                 for (h = 32; h > 0; h--)
3892                         for (i = 0; i < op->charcount; i++) {
3893                                 if (get_user(tmp, &charmap[32*i+h-1]))
3894                                         return -EFAULT;
3895                                 if (tmp)
3896                                         goto nonzero;
3897                         }
3898                 return -EINVAL;
3899         nonzero:
3900                 op->height = h;
3901         }
3902         if (op->width <= 0 || op->width > 32 || op->height > 32)
3903                 return -EINVAL;
3904         size = (op->width+7)/8 * 32 * op->charcount;
3905         if (size > max_font_size)
3906                 return -ENOSPC;
3907         font.charcount = op->charcount;
3908         font.height = op->height;
3909         font.width = op->width;
3910         font.data = kmalloc(size, GFP_KERNEL);
3911         if (!font.data)
3912                 return -ENOMEM;
3913         if (copy_from_user(font.data, op->data, size)) {
3914                 kfree(font.data);
3915                 return -EFAULT;
3916         }
3917         acquire_console_sem();
3918         if (vc->vc_sw->con_font_set)
3919                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3920         else
3921                 rc = -ENOSYS;
3922         release_console_sem();
3923         kfree(font.data);
3924         return rc;
3925 }
3926
3927 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3928 {
3929         struct console_font font = {.width = op->width, .height = op->height};
3930         char name[MAX_FONT_NAME];
3931         char *s = name;
3932         int rc;
3933
3934         if (vc->vc_mode != KD_TEXT)
3935                 return -EINVAL;
3936
3937         if (!op->data)
3938                 s = NULL;
3939         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3940                 return -EFAULT;
3941         else
3942                 name[MAX_FONT_NAME - 1] = 0;
3943
3944         acquire_console_sem();
3945         if (vc->vc_sw->con_font_default)
3946                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3947         else
3948                 rc = -ENOSYS;
3949         release_console_sem();
3950         if (!rc) {
3951                 op->width = font.width;
3952                 op->height = font.height;
3953         }
3954         return rc;
3955 }
3956
3957 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3958 {
3959         int con = op->height;
3960         int rc;
3961
3962         if (vc->vc_mode != KD_TEXT)
3963                 return -EINVAL;
3964
3965         acquire_console_sem();
3966         if (!vc->vc_sw->con_font_copy)
3967                 rc = -ENOSYS;
3968         else if (con < 0 || !vc_cons_allocated(con))
3969                 rc = -ENOTTY;
3970         else if (con == vc->vc_num)     /* nothing to do */
3971                 rc = 0;
3972         else
3973                 rc = vc->vc_sw->con_font_copy(vc, con);
3974         release_console_sem();
3975         return rc;
3976 }
3977
3978 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3979 {
3980         switch (op->op) {
3981         case KD_FONT_OP_SET:
3982                 return con_font_set(vc, op);
3983         case KD_FONT_OP_GET:
3984                 return con_font_get(vc, op);
3985         case KD_FONT_OP_SET_DEFAULT:
3986                 return con_font_default(vc, op);
3987         case KD_FONT_OP_COPY:
3988                 return con_font_copy(vc, op);
3989         }
3990         return -ENOSYS;
3991 }
3992
3993 /*
3994  *      Interface exported to selection and vcs.
3995  */
3996
3997 /* used by selection */
3998 u16 screen_glyph(struct vc_data *vc, int offset)
3999 {
4000         u16 w = scr_readw(screenpos(vc, offset, 1));
4001         u16 c = w & 0xff;
4002
4003         if (w & vc->vc_hi_font_mask)
4004                 c |= 0x100;
4005         return c;
4006 }
4007 EXPORT_SYMBOL_GPL(screen_glyph);
4008
4009 /* used by vcs - note the word offset */
4010 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4011 {
4012         return screenpos(vc, 2 * w_offset, viewed);
4013 }
4014
4015 void getconsxy(struct vc_data *vc, unsigned char *p)
4016 {
4017         p[0] = vc->vc_x;
4018         p[1] = vc->vc_y;
4019 }
4020
4021 void putconsxy(struct vc_data *vc, unsigned char *p)
4022 {
4023         hide_cursor(vc);
4024         gotoxy(vc, p[0], p[1]);
4025         set_cursor(vc);
4026 }
4027
4028 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4029 {
4030         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4031                 return softcursor_original;
4032         return scr_readw(org);
4033 }
4034
4035 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4036 {
4037         scr_writew(val, org);
4038         if ((unsigned long)org == vc->vc_pos) {
4039                 softcursor_original = -1;
4040                 add_softcursor(vc);
4041         }
4042 }
4043
4044 /*
4045  *      Visible symbols for modules
4046  */
4047
4048 EXPORT_SYMBOL(color_table);
4049 EXPORT_SYMBOL(default_red);
4050 EXPORT_SYMBOL(default_grn);
4051 EXPORT_SYMBOL(default_blu);
4052 EXPORT_SYMBOL(update_region);
4053 EXPORT_SYMBOL(redraw_screen);
4054 EXPORT_SYMBOL(vc_resize);
4055 EXPORT_SYMBOL(vc_lock_resize);
4056 EXPORT_SYMBOL(fg_console);
4057 EXPORT_SYMBOL(console_blank_hook);
4058 EXPORT_SYMBOL(console_blanked);
4059 EXPORT_SYMBOL(vc_cons);
4060 #ifndef VT_SINGLE_DRIVER
4061 EXPORT_SYMBOL(take_over_console);
4062 EXPORT_SYMBOL(give_up_console);
4063 #endif