vt: fix vc_resize locking
[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, vc->vc_decscnm, 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                 struct pid *pgrp = NULL;
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_irq(&vc->vc_tty->ctrl_lock);
921                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col))
922                         pgrp = get_pid(vc->vc_tty->pgrp);
923                 spin_unlock_irq(&vc->vc_tty->ctrl_lock);
924                 if (pgrp) {
925                         kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
926                         put_pid(pgrp);
927                 }
928                 *cws = ws;
929                 mutex_unlock(&vc->vc_tty->termios_mutex);
930         }
931
932         if (CON_IS_VISIBLE(vc))
933                 update_screen(vc);
934         return err;
935 }
936
937 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
938 {
939         int rc;
940
941         acquire_console_sem();
942         rc = vc_resize(vc, cols, lines);
943         release_console_sem();
944         return rc;
945 }
946
947 void vc_deallocate(unsigned int currcons)
948 {
949         WARN_CONSOLE_UNLOCKED();
950
951         if (vc_cons_allocated(currcons)) {
952                 struct vc_data *vc = vc_cons[currcons].d;
953                 struct vt_notifier_param param = { .vc = vc };
954                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
955                 vc->vc_sw->con_deinit(vc);
956                 put_pid(vc->vt_pid);
957                 module_put(vc->vc_sw->owner);
958                 if (vc->vc_kmalloced)
959                         kfree(vc->vc_screenbuf);
960                 if (currcons >= MIN_NR_CONSOLES)
961                         kfree(vc);
962                 vc_cons[currcons].d = NULL;
963         }
964 }
965
966 /*
967  *      VT102 emulator
968  */
969
970 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
971 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
972 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
973
974 #define decarm          VC_REPEAT
975 #define decckm          VC_CKMODE
976 #define kbdapplic       VC_APPLIC
977 #define lnm             VC_CRLF
978
979 /*
980  * this is what the terminal answers to a ESC-Z or csi0c query.
981  */
982 #define VT100ID "\033[?1;2c"
983 #define VT102ID "\033[?6c"
984
985 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
986                                        8,12,10,14, 9,13,11,15 };
987
988 /* the default colour table, for VGA+ colour systems */
989 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
990     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
991 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
992     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
993 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
994     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
995
996 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
997 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
998 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
999
1000 /*
1001  * gotoxy() must verify all boundaries, because the arguments
1002  * might also be negative. If the given position is out of
1003  * bounds, the cursor is placed at the nearest margin.
1004  */
1005 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1006 {
1007         int min_y, max_y;
1008
1009         if (new_x < 0)
1010                 vc->vc_x = 0;
1011         else {
1012                 if (new_x >= vc->vc_cols)
1013                         vc->vc_x = vc->vc_cols - 1;
1014                 else
1015                         vc->vc_x = new_x;
1016         }
1017
1018         if (vc->vc_decom) {
1019                 min_y = vc->vc_top;
1020                 max_y = vc->vc_bottom;
1021         } else {
1022                 min_y = 0;
1023                 max_y = vc->vc_rows;
1024         }
1025         if (new_y < min_y)
1026                 vc->vc_y = min_y;
1027         else if (new_y >= max_y)
1028                 vc->vc_y = max_y - 1;
1029         else
1030                 vc->vc_y = new_y;
1031         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1032         vc->vc_need_wrap = 0;
1033 }
1034
1035 /* for absolute user moves, when decom is set */
1036 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1037 {
1038         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1039 }
1040
1041 void scrollback(struct vc_data *vc, int lines)
1042 {
1043         if (!lines)
1044                 lines = vc->vc_rows / 2;
1045         scrolldelta(-lines);
1046 }
1047
1048 void scrollfront(struct vc_data *vc, int lines)
1049 {
1050         if (!lines)
1051                 lines = vc->vc_rows / 2;
1052         scrolldelta(lines);
1053 }
1054
1055 static void lf(struct vc_data *vc)
1056 {
1057         /* don't scroll if above bottom of scrolling region, or
1058          * if below scrolling region
1059          */
1060         if (vc->vc_y + 1 == vc->vc_bottom)
1061                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1062         else if (vc->vc_y < vc->vc_rows - 1) {
1063                 vc->vc_y++;
1064                 vc->vc_pos += vc->vc_size_row;
1065         }
1066         vc->vc_need_wrap = 0;
1067         notify_write(vc, '\n');
1068 }
1069
1070 static void ri(struct vc_data *vc)
1071 {
1072         /* don't scroll if below top of scrolling region, or
1073          * if above scrolling region
1074          */
1075         if (vc->vc_y == vc->vc_top)
1076                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1077         else if (vc->vc_y > 0) {
1078                 vc->vc_y--;
1079                 vc->vc_pos -= vc->vc_size_row;
1080         }
1081         vc->vc_need_wrap = 0;
1082 }
1083
1084 static inline void cr(struct vc_data *vc)
1085 {
1086         vc->vc_pos -= vc->vc_x << 1;
1087         vc->vc_need_wrap = vc->vc_x = 0;
1088         notify_write(vc, '\r');
1089 }
1090
1091 static inline void bs(struct vc_data *vc)
1092 {
1093         if (vc->vc_x) {
1094                 vc->vc_pos -= 2;
1095                 vc->vc_x--;
1096                 vc->vc_need_wrap = 0;
1097                 notify_write(vc, '\b');
1098         }
1099 }
1100
1101 static inline void del(struct vc_data *vc)
1102 {
1103         /* ignored */
1104 }
1105
1106 static void csi_J(struct vc_data *vc, int vpar)
1107 {
1108         unsigned int count;
1109         unsigned short * start;
1110
1111         switch (vpar) {
1112                 case 0: /* erase from cursor to end of display */
1113                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1114                         start = (unsigned short *)vc->vc_pos;
1115                         if (DO_UPDATE(vc)) {
1116                                 /* do in two stages */
1117                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1118                                               vc->vc_cols - vc->vc_x);
1119                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1120                                               vc->vc_rows - vc->vc_y - 1,
1121                                               vc->vc_cols);
1122                         }
1123                         break;
1124                 case 1: /* erase from start to cursor */
1125                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1126                         start = (unsigned short *)vc->vc_origin;
1127                         if (DO_UPDATE(vc)) {
1128                                 /* do in two stages */
1129                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1130                                               vc->vc_cols);
1131                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1132                                               vc->vc_x + 1);
1133                         }
1134                         break;
1135                 case 2: /* erase whole display */
1136                         count = vc->vc_cols * vc->vc_rows;
1137                         start = (unsigned short *)vc->vc_origin;
1138                         if (DO_UPDATE(vc))
1139                                 vc->vc_sw->con_clear(vc, 0, 0,
1140                                               vc->vc_rows,
1141                                               vc->vc_cols);
1142                         break;
1143                 default:
1144                         return;
1145         }
1146         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1147         vc->vc_need_wrap = 0;
1148 }
1149
1150 static void csi_K(struct vc_data *vc, int vpar)
1151 {
1152         unsigned int count;
1153         unsigned short * start;
1154
1155         switch (vpar) {
1156                 case 0: /* erase from cursor to end of line */
1157                         count = vc->vc_cols - vc->vc_x;
1158                         start = (unsigned short *)vc->vc_pos;
1159                         if (DO_UPDATE(vc))
1160                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1161                                                      vc->vc_cols - vc->vc_x);
1162                         break;
1163                 case 1: /* erase from start of line to cursor */
1164                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1165                         count = vc->vc_x + 1;
1166                         if (DO_UPDATE(vc))
1167                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1168                                                      vc->vc_x + 1);
1169                         break;
1170                 case 2: /* erase whole line */
1171                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1172                         count = vc->vc_cols;
1173                         if (DO_UPDATE(vc))
1174                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1175                                               vc->vc_cols);
1176                         break;
1177                 default:
1178                         return;
1179         }
1180         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1181         vc->vc_need_wrap = 0;
1182 }
1183
1184 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1185 {                                         /* not vt100? */
1186         int count;
1187
1188         if (!vpar)
1189                 vpar++;
1190         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1191
1192         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1193         if (DO_UPDATE(vc))
1194                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1195         vc->vc_need_wrap = 0;
1196 }
1197
1198 static void default_attr(struct vc_data *vc)
1199 {
1200         vc->vc_intensity = 1;
1201         vc->vc_italic = 0;
1202         vc->vc_underline = 0;
1203         vc->vc_reverse = 0;
1204         vc->vc_blink = 0;
1205         vc->vc_color = vc->vc_def_color;
1206 }
1207
1208 /* console_sem is held */
1209 static void csi_m(struct vc_data *vc)
1210 {
1211         int i;
1212
1213         for (i = 0; i <= vc->vc_npar; i++)
1214                 switch (vc->vc_par[i]) {
1215                         case 0: /* all attributes off */
1216                                 default_attr(vc);
1217                                 break;
1218                         case 1:
1219                                 vc->vc_intensity = 2;
1220                                 break;
1221                         case 2:
1222                                 vc->vc_intensity = 0;
1223                                 break;
1224                         case 3:
1225                                 vc->vc_italic = 1;
1226                                 break;
1227                         case 4:
1228                                 vc->vc_underline = 1;
1229                                 break;
1230                         case 5:
1231                                 vc->vc_blink = 1;
1232                                 break;
1233                         case 7:
1234                                 vc->vc_reverse = 1;
1235                                 break;
1236                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1237                                   * Select primary font, don't display
1238                                   * control chars if defined, don't set
1239                                   * bit 8 on output.
1240                                   */
1241                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1242                                                 ? vc->vc_G0_charset
1243                                                 : vc->vc_G1_charset, vc);
1244                                 vc->vc_disp_ctrl = 0;
1245                                 vc->vc_toggle_meta = 0;
1246                                 break;
1247                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1248                                   * Select first alternate font, lets
1249                                   * chars < 32 be displayed as ROM chars.
1250                                   */
1251                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1252                                 vc->vc_disp_ctrl = 1;
1253                                 vc->vc_toggle_meta = 0;
1254                                 break;
1255                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1256                                   * Select second alternate font, toggle
1257                                   * high bit before displaying as ROM char.
1258                                   */
1259                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1260                                 vc->vc_disp_ctrl = 1;
1261                                 vc->vc_toggle_meta = 1;
1262                                 break;
1263                         case 21:
1264                         case 22:
1265                                 vc->vc_intensity = 1;
1266                                 break;
1267                         case 23:
1268                                 vc->vc_italic = 0;
1269                                 break;
1270                         case 24:
1271                                 vc->vc_underline = 0;
1272                                 break;
1273                         case 25:
1274                                 vc->vc_blink = 0;
1275                                 break;
1276                         case 27:
1277                                 vc->vc_reverse = 0;
1278                                 break;
1279                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1280                                   * Enables underscore, white foreground
1281                                   * with white underscore (Linux - use
1282                                   * default foreground).
1283                                   */
1284                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1285                                 vc->vc_underline = 1;
1286                                 break;
1287                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1288                                   * Disable underline option.
1289                                   * Reset colour to default? It did this
1290                                   * before...
1291                                   */
1292                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1293                                 vc->vc_underline = 0;
1294                                 break;
1295                         case 49:
1296                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1297                                 break;
1298                         default:
1299                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1300                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1301                                                 | (vc->vc_color & 0xf0);
1302                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1303                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1304                                                 | (vc->vc_color & 0x0f);
1305                                 break;
1306                 }
1307         update_attr(vc);
1308 }
1309
1310 static void respond_string(const char *p, struct tty_struct *tty)
1311 {
1312         while (*p) {
1313                 tty_insert_flip_char(tty, *p, 0);
1314                 p++;
1315         }
1316         con_schedule_flip(tty);
1317 }
1318
1319 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1320 {
1321         char buf[40];
1322
1323         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1324         respond_string(buf, tty);
1325 }
1326
1327 static inline void status_report(struct tty_struct *tty)
1328 {
1329         respond_string("\033[0n", tty); /* Terminal ok */
1330 }
1331
1332 static inline void respond_ID(struct tty_struct * tty)
1333 {
1334         respond_string(VT102ID, tty);
1335 }
1336
1337 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1338 {
1339         char buf[8];
1340
1341         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1342                 (char)('!' + mry));
1343         respond_string(buf, tty);
1344 }
1345
1346 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1347 int mouse_reporting(void)
1348 {
1349         return vc_cons[fg_console].d->vc_report_mouse;
1350 }
1351
1352 /* console_sem is held */
1353 static void set_mode(struct vc_data *vc, int on_off)
1354 {
1355         int i;
1356
1357         for (i = 0; i <= vc->vc_npar; i++)
1358                 if (vc->vc_ques) {
1359                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1360                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1361                                 if (on_off)
1362                                         set_kbd(vc, decckm);
1363                                 else
1364                                         clr_kbd(vc, decckm);
1365                                 break;
1366                         case 3: /* 80/132 mode switch unimplemented */
1367                                 vc->vc_deccolm = on_off;
1368 #if 0
1369                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1370                                 /* this alone does not suffice; some user mode
1371                                    utility has to change the hardware regs */
1372 #endif
1373                                 break;
1374                         case 5:                 /* Inverted screen on/off */
1375                                 if (vc->vc_decscnm != on_off) {
1376                                         vc->vc_decscnm = on_off;
1377                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1378                                         update_attr(vc);
1379                                 }
1380                                 break;
1381                         case 6:                 /* Origin relative/absolute */
1382                                 vc->vc_decom = on_off;
1383                                 gotoxay(vc, 0, 0);
1384                                 break;
1385                         case 7:                 /* Autowrap on/off */
1386                                 vc->vc_decawm = on_off;
1387                                 break;
1388                         case 8:                 /* Autorepeat on/off */
1389                                 if (on_off)
1390                                         set_kbd(vc, decarm);
1391                                 else
1392                                         clr_kbd(vc, decarm);
1393                                 break;
1394                         case 9:
1395                                 vc->vc_report_mouse = on_off ? 1 : 0;
1396                                 break;
1397                         case 25:                /* Cursor on/off */
1398                                 vc->vc_deccm = on_off;
1399                                 break;
1400                         case 1000:
1401                                 vc->vc_report_mouse = on_off ? 2 : 0;
1402                                 break;
1403                         }
1404                 } else {
1405                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1406                         case 3:                 /* Monitor (display ctrls) */
1407                                 vc->vc_disp_ctrl = on_off;
1408                                 break;
1409                         case 4:                 /* Insert Mode on/off */
1410                                 vc->vc_decim = on_off;
1411                                 break;
1412                         case 20:                /* Lf, Enter == CrLf/Lf */
1413                                 if (on_off)
1414                                         set_kbd(vc, lnm);
1415                                 else
1416                                         clr_kbd(vc, lnm);
1417                                 break;
1418                         }
1419                 }
1420 }
1421
1422 /* console_sem is held */
1423 static void setterm_command(struct vc_data *vc)
1424 {
1425         switch(vc->vc_par[0]) {
1426                 case 1: /* set color for underline mode */
1427                         if (vc->vc_can_do_color &&
1428                                         vc->vc_par[1] < 16) {
1429                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1430                                 if (vc->vc_underline)
1431                                         update_attr(vc);
1432                         }
1433                         break;
1434                 case 2: /* set color for half intensity mode */
1435                         if (vc->vc_can_do_color &&
1436                                         vc->vc_par[1] < 16) {
1437                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1438                                 if (vc->vc_intensity == 0)
1439                                         update_attr(vc);
1440                         }
1441                         break;
1442                 case 8: /* store colors as defaults */
1443                         vc->vc_def_color = vc->vc_attr;
1444                         if (vc->vc_hi_font_mask == 0x100)
1445                                 vc->vc_def_color >>= 1;
1446                         default_attr(vc);
1447                         update_attr(vc);
1448                         break;
1449                 case 9: /* set blanking interval */
1450                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1451                         poke_blanked_console();
1452                         break;
1453                 case 10: /* set bell frequency in Hz */
1454                         if (vc->vc_npar >= 1)
1455                                 vc->vc_bell_pitch = vc->vc_par[1];
1456                         else
1457                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1458                         break;
1459                 case 11: /* set bell duration in msec */
1460                         if (vc->vc_npar >= 1)
1461                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1462                                         vc->vc_par[1] * HZ / 1000 : 0;
1463                         else
1464                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1465                         break;
1466                 case 12: /* bring specified console to the front */
1467                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1468                                 set_console(vc->vc_par[1] - 1);
1469                         break;
1470                 case 13: /* unblank the screen */
1471                         poke_blanked_console();
1472                         break;
1473                 case 14: /* set vesa powerdown interval */
1474                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1475                         break;
1476                 case 15: /* activate the previous console */
1477                         set_console(last_console);
1478                         break;
1479         }
1480 }
1481
1482 /* console_sem is held */
1483 static void csi_at(struct vc_data *vc, unsigned int nr)
1484 {
1485         if (nr > vc->vc_cols - vc->vc_x)
1486                 nr = vc->vc_cols - vc->vc_x;
1487         else if (!nr)
1488                 nr = 1;
1489         insert_char(vc, nr);
1490 }
1491
1492 /* console_sem is held */
1493 static void csi_L(struct vc_data *vc, unsigned int nr)
1494 {
1495         if (nr > vc->vc_rows - vc->vc_y)
1496                 nr = vc->vc_rows - vc->vc_y;
1497         else if (!nr)
1498                 nr = 1;
1499         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1500         vc->vc_need_wrap = 0;
1501 }
1502
1503 /* console_sem is held */
1504 static void csi_P(struct vc_data *vc, unsigned int nr)
1505 {
1506         if (nr > vc->vc_cols - vc->vc_x)
1507                 nr = vc->vc_cols - vc->vc_x;
1508         else if (!nr)
1509                 nr = 1;
1510         delete_char(vc, nr);
1511 }
1512
1513 /* console_sem is held */
1514 static void csi_M(struct vc_data *vc, unsigned int nr)
1515 {
1516         if (nr > vc->vc_rows - vc->vc_y)
1517                 nr = vc->vc_rows - vc->vc_y;
1518         else if (!nr)
1519                 nr=1;
1520         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1521         vc->vc_need_wrap = 0;
1522 }
1523
1524 /* console_sem is held (except via vc_init->reset_terminal */
1525 static void save_cur(struct vc_data *vc)
1526 {
1527         vc->vc_saved_x          = vc->vc_x;
1528         vc->vc_saved_y          = vc->vc_y;
1529         vc->vc_s_intensity      = vc->vc_intensity;
1530         vc->vc_s_italic         = vc->vc_italic;
1531         vc->vc_s_underline      = vc->vc_underline;
1532         vc->vc_s_blink          = vc->vc_blink;
1533         vc->vc_s_reverse        = vc->vc_reverse;
1534         vc->vc_s_charset        = vc->vc_charset;
1535         vc->vc_s_color          = vc->vc_color;
1536         vc->vc_saved_G0         = vc->vc_G0_charset;
1537         vc->vc_saved_G1         = vc->vc_G1_charset;
1538 }
1539
1540 /* console_sem is held */
1541 static void restore_cur(struct vc_data *vc)
1542 {
1543         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1544         vc->vc_intensity        = vc->vc_s_intensity;
1545         vc->vc_italic           = vc->vc_s_italic;
1546         vc->vc_underline        = vc->vc_s_underline;
1547         vc->vc_blink            = vc->vc_s_blink;
1548         vc->vc_reverse          = vc->vc_s_reverse;
1549         vc->vc_charset          = vc->vc_s_charset;
1550         vc->vc_color            = vc->vc_s_color;
1551         vc->vc_G0_charset       = vc->vc_saved_G0;
1552         vc->vc_G1_charset       = vc->vc_saved_G1;
1553         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1554         update_attr(vc);
1555         vc->vc_need_wrap = 0;
1556 }
1557
1558 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1559         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1560         ESpalette };
1561
1562 /* console_sem is held (except via vc_init()) */
1563 static void reset_terminal(struct vc_data *vc, int do_clear)
1564 {
1565         vc->vc_top              = 0;
1566         vc->vc_bottom           = vc->vc_rows;
1567         vc->vc_state            = ESnormal;
1568         vc->vc_ques             = 0;
1569         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1570         vc->vc_G0_charset       = LAT1_MAP;
1571         vc->vc_G1_charset       = GRAF_MAP;
1572         vc->vc_charset          = 0;
1573         vc->vc_need_wrap        = 0;
1574         vc->vc_report_mouse     = 0;
1575         vc->vc_utf              = default_utf8;
1576         vc->vc_utf_count        = 0;
1577
1578         vc->vc_disp_ctrl        = 0;
1579         vc->vc_toggle_meta      = 0;
1580
1581         vc->vc_decscnm          = 0;
1582         vc->vc_decom            = 0;
1583         vc->vc_decawm           = 1;
1584         vc->vc_deccm            = 1;
1585         vc->vc_decim            = 0;
1586
1587         set_kbd(vc, decarm);
1588         clr_kbd(vc, decckm);
1589         clr_kbd(vc, kbdapplic);
1590         clr_kbd(vc, lnm);
1591         kbd_table[vc->vc_num].lockstate = 0;
1592         kbd_table[vc->vc_num].slockstate = 0;
1593         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1594         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1595         /* do not do set_leds here because this causes an endless tasklet loop
1596            when the keyboard hasn't been initialized yet */
1597
1598         vc->vc_cursor_type = CUR_DEFAULT;
1599         vc->vc_complement_mask = vc->vc_s_complement_mask;
1600
1601         default_attr(vc);
1602         update_attr(vc);
1603
1604         vc->vc_tab_stop[0]      = 0x01010100;
1605         vc->vc_tab_stop[1]      =
1606         vc->vc_tab_stop[2]      =
1607         vc->vc_tab_stop[3]      =
1608         vc->vc_tab_stop[4]      = 0x01010101;
1609
1610         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1611         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1612
1613         gotoxy(vc, 0, 0);
1614         save_cur(vc);
1615         if (do_clear)
1616             csi_J(vc, 2);
1617 }
1618
1619 /* console_sem is held */
1620 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1621 {
1622         /*
1623          *  Control characters can be used in the _middle_
1624          *  of an escape sequence.
1625          */
1626         switch (c) {
1627         case 0:
1628                 return;
1629         case 7:
1630                 if (vc->vc_bell_duration)
1631                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1632                 return;
1633         case 8:
1634                 bs(vc);
1635                 return;
1636         case 9:
1637                 vc->vc_pos -= (vc->vc_x << 1);
1638                 while (vc->vc_x < vc->vc_cols - 1) {
1639                         vc->vc_x++;
1640                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1641                                 break;
1642                 }
1643                 vc->vc_pos += (vc->vc_x << 1);
1644                 notify_write(vc, '\t');
1645                 return;
1646         case 10: case 11: case 12:
1647                 lf(vc);
1648                 if (!is_kbd(vc, lnm))
1649                         return;
1650         case 13:
1651                 cr(vc);
1652                 return;
1653         case 14:
1654                 vc->vc_charset = 1;
1655                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1656                 vc->vc_disp_ctrl = 1;
1657                 return;
1658         case 15:
1659                 vc->vc_charset = 0;
1660                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1661                 vc->vc_disp_ctrl = 0;
1662                 return;
1663         case 24: case 26:
1664                 vc->vc_state = ESnormal;
1665                 return;
1666         case 27:
1667                 vc->vc_state = ESesc;
1668                 return;
1669         case 127:
1670                 del(vc);
1671                 return;
1672         case 128+27:
1673                 vc->vc_state = ESsquare;
1674                 return;
1675         }
1676         switch(vc->vc_state) {
1677         case ESesc:
1678                 vc->vc_state = ESnormal;
1679                 switch (c) {
1680                 case '[':
1681                         vc->vc_state = ESsquare;
1682                         return;
1683                 case ']':
1684                         vc->vc_state = ESnonstd;
1685                         return;
1686                 case '%':
1687                         vc->vc_state = ESpercent;
1688                         return;
1689                 case 'E':
1690                         cr(vc);
1691                         lf(vc);
1692                         return;
1693                 case 'M':
1694                         ri(vc);
1695                         return;
1696                 case 'D':
1697                         lf(vc);
1698                         return;
1699                 case 'H':
1700                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1701                         return;
1702                 case 'Z':
1703                         respond_ID(tty);
1704                         return;
1705                 case '7':
1706                         save_cur(vc);
1707                         return;
1708                 case '8':
1709                         restore_cur(vc);
1710                         return;
1711                 case '(':
1712                         vc->vc_state = ESsetG0;
1713                         return;
1714                 case ')':
1715                         vc->vc_state = ESsetG1;
1716                         return;
1717                 case '#':
1718                         vc->vc_state = EShash;
1719                         return;
1720                 case 'c':
1721                         reset_terminal(vc, 1);
1722                         return;
1723                 case '>':  /* Numeric keypad */
1724                         clr_kbd(vc, kbdapplic);
1725                         return;
1726                 case '=':  /* Appl. keypad */
1727                         set_kbd(vc, kbdapplic);
1728                         return;
1729                 }
1730                 return;
1731         case ESnonstd:
1732                 if (c=='P') {   /* palette escape sequence */
1733                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1734                                 vc->vc_par[vc->vc_npar] = 0;
1735                         vc->vc_npar = 0;
1736                         vc->vc_state = ESpalette;
1737                         return;
1738                 } else if (c=='R') {   /* reset palette */
1739                         reset_palette(vc);
1740                         vc->vc_state = ESnormal;
1741                 } else
1742                         vc->vc_state = ESnormal;
1743                 return;
1744         case ESpalette:
1745                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1746                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1747                         if (vc->vc_npar == 7) {
1748                                 int i = vc->vc_par[0] * 3, j = 1;
1749                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1750                                 vc->vc_palette[i++] += vc->vc_par[j++];
1751                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1752                                 vc->vc_palette[i++] += vc->vc_par[j++];
1753                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1754                                 vc->vc_palette[i] += vc->vc_par[j];
1755                                 set_palette(vc);
1756                                 vc->vc_state = ESnormal;
1757                         }
1758                 } else
1759                         vc->vc_state = ESnormal;
1760                 return;
1761         case ESsquare:
1762                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1763                         vc->vc_par[vc->vc_npar] = 0;
1764                 vc->vc_npar = 0;
1765                 vc->vc_state = ESgetpars;
1766                 if (c == '[') { /* Function key */
1767                         vc->vc_state=ESfunckey;
1768                         return;
1769                 }
1770                 vc->vc_ques = (c == '?');
1771                 if (vc->vc_ques)
1772                         return;
1773         case ESgetpars:
1774                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1775                         vc->vc_npar++;
1776                         return;
1777                 } else if (c>='0' && c<='9') {
1778                         vc->vc_par[vc->vc_npar] *= 10;
1779                         vc->vc_par[vc->vc_npar] += c - '0';
1780                         return;
1781                 } else
1782                         vc->vc_state = ESgotpars;
1783         case ESgotpars:
1784                 vc->vc_state = ESnormal;
1785                 switch(c) {
1786                 case 'h':
1787                         set_mode(vc, 1);
1788                         return;
1789                 case 'l':
1790                         set_mode(vc, 0);
1791                         return;
1792                 case 'c':
1793                         if (vc->vc_ques) {
1794                                 if (vc->vc_par[0])
1795                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1796                                 else
1797                                         vc->vc_cursor_type = CUR_DEFAULT;
1798                                 return;
1799                         }
1800                         break;
1801                 case 'm':
1802                         if (vc->vc_ques) {
1803                                 clear_selection();
1804                                 if (vc->vc_par[0])
1805                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1806                                 else
1807                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1808                                 return;
1809                         }
1810                         break;
1811                 case 'n':
1812                         if (!vc->vc_ques) {
1813                                 if (vc->vc_par[0] == 5)
1814                                         status_report(tty);
1815                                 else if (vc->vc_par[0] == 6)
1816                                         cursor_report(vc, tty);
1817                         }
1818                         return;
1819                 }
1820                 if (vc->vc_ques) {
1821                         vc->vc_ques = 0;
1822                         return;
1823                 }
1824                 switch(c) {
1825                 case 'G': case '`':
1826                         if (vc->vc_par[0])
1827                                 vc->vc_par[0]--;
1828                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1829                         return;
1830                 case 'A':
1831                         if (!vc->vc_par[0])
1832                                 vc->vc_par[0]++;
1833                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1834                         return;
1835                 case 'B': case 'e':
1836                         if (!vc->vc_par[0])
1837                                 vc->vc_par[0]++;
1838                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1839                         return;
1840                 case 'C': case 'a':
1841                         if (!vc->vc_par[0])
1842                                 vc->vc_par[0]++;
1843                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1844                         return;
1845                 case 'D':
1846                         if (!vc->vc_par[0])
1847                                 vc->vc_par[0]++;
1848                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1849                         return;
1850                 case 'E':
1851                         if (!vc->vc_par[0])
1852                                 vc->vc_par[0]++;
1853                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1854                         return;
1855                 case 'F':
1856                         if (!vc->vc_par[0])
1857                                 vc->vc_par[0]++;
1858                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1859                         return;
1860                 case 'd':
1861                         if (vc->vc_par[0])
1862                                 vc->vc_par[0]--;
1863                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1864                         return;
1865                 case 'H': case 'f':
1866                         if (vc->vc_par[0])
1867                                 vc->vc_par[0]--;
1868                         if (vc->vc_par[1])
1869                                 vc->vc_par[1]--;
1870                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1871                         return;
1872                 case 'J':
1873                         csi_J(vc, vc->vc_par[0]);
1874                         return;
1875                 case 'K':
1876                         csi_K(vc, vc->vc_par[0]);
1877                         return;
1878                 case 'L':
1879                         csi_L(vc, vc->vc_par[0]);
1880                         return;
1881                 case 'M':
1882                         csi_M(vc, vc->vc_par[0]);
1883                         return;
1884                 case 'P':
1885                         csi_P(vc, vc->vc_par[0]);
1886                         return;
1887                 case 'c':
1888                         if (!vc->vc_par[0])
1889                                 respond_ID(tty);
1890                         return;
1891                 case 'g':
1892                         if (!vc->vc_par[0])
1893                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1894                         else if (vc->vc_par[0] == 3) {
1895                                 vc->vc_tab_stop[0] =
1896                                         vc->vc_tab_stop[1] =
1897                                         vc->vc_tab_stop[2] =
1898                                         vc->vc_tab_stop[3] =
1899                                         vc->vc_tab_stop[4] = 0;
1900                         }
1901                         return;
1902                 case 'm':
1903                         csi_m(vc);
1904                         return;
1905                 case 'q': /* DECLL - but only 3 leds */
1906                         /* map 0,1,2,3 to 0,1,2,4 */
1907                         if (vc->vc_par[0] < 4)
1908                                 setledstate(kbd_table + vc->vc_num,
1909                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1910                         return;
1911                 case 'r':
1912                         if (!vc->vc_par[0])
1913                                 vc->vc_par[0]++;
1914                         if (!vc->vc_par[1])
1915                                 vc->vc_par[1] = vc->vc_rows;
1916                         /* Minimum allowed region is 2 lines */
1917                         if (vc->vc_par[0] < vc->vc_par[1] &&
1918                             vc->vc_par[1] <= vc->vc_rows) {
1919                                 vc->vc_top = vc->vc_par[0] - 1;
1920                                 vc->vc_bottom = vc->vc_par[1];
1921                                 gotoxay(vc, 0, 0);
1922                         }
1923                         return;
1924                 case 's':
1925                         save_cur(vc);
1926                         return;
1927                 case 'u':
1928                         restore_cur(vc);
1929                         return;
1930                 case 'X':
1931                         csi_X(vc, vc->vc_par[0]);
1932                         return;
1933                 case '@':
1934                         csi_at(vc, vc->vc_par[0]);
1935                         return;
1936                 case ']': /* setterm functions */
1937                         setterm_command(vc);
1938                         return;
1939                 }
1940                 return;
1941         case ESpercent:
1942                 vc->vc_state = ESnormal;
1943                 switch (c) {
1944                 case '@':  /* defined in ISO 2022 */
1945                         vc->vc_utf = 0;
1946                         return;
1947                 case 'G':  /* prelim official escape code */
1948                 case '8':  /* retained for compatibility */
1949                         vc->vc_utf = 1;
1950                         return;
1951                 }
1952                 return;
1953         case ESfunckey:
1954                 vc->vc_state = ESnormal;
1955                 return;
1956         case EShash:
1957                 vc->vc_state = ESnormal;
1958                 if (c == '8') {
1959                         /* DEC screen alignment test. kludge :-) */
1960                         vc->vc_video_erase_char =
1961                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1962                         csi_J(vc, 2);
1963                         vc->vc_video_erase_char =
1964                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1965                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1966                 }
1967                 return;
1968         case ESsetG0:
1969                 if (c == '0')
1970                         vc->vc_G0_charset = GRAF_MAP;
1971                 else if (c == 'B')
1972                         vc->vc_G0_charset = LAT1_MAP;
1973                 else if (c == 'U')
1974                         vc->vc_G0_charset = IBMPC_MAP;
1975                 else if (c == 'K')
1976                         vc->vc_G0_charset = USER_MAP;
1977                 if (vc->vc_charset == 0)
1978                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1979                 vc->vc_state = ESnormal;
1980                 return;
1981         case ESsetG1:
1982                 if (c == '0')
1983                         vc->vc_G1_charset = GRAF_MAP;
1984                 else if (c == 'B')
1985                         vc->vc_G1_charset = LAT1_MAP;
1986                 else if (c == 'U')
1987                         vc->vc_G1_charset = IBMPC_MAP;
1988                 else if (c == 'K')
1989                         vc->vc_G1_charset = USER_MAP;
1990                 if (vc->vc_charset == 1)
1991                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1992                 vc->vc_state = ESnormal;
1993                 return;
1994         default:
1995                 vc->vc_state = ESnormal;
1996         }
1997 }
1998
1999 /* This is a temporary buffer used to prepare a tty console write
2000  * so that we can easily avoid touching user space while holding the
2001  * console spinlock.  It is allocated in con_init and is shared by
2002  * this code and the vc_screen read/write tty calls.
2003  *
2004  * We have to allocate this statically in the kernel data section
2005  * since console_init (and thus con_init) are called before any
2006  * kernel memory allocation is available.
2007  */
2008 char con_buf[CON_BUF_SIZE];
2009 DEFINE_MUTEX(con_buf_mtx);
2010
2011 /* is_double_width() is based on the wcwidth() implementation by
2012  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2013  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2014  */
2015 struct interval {
2016         uint32_t first;
2017         uint32_t last;
2018 };
2019
2020 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2021 {
2022         int min = 0;
2023         int mid;
2024
2025         if (ucs < table[0].first || ucs > table[max].last)
2026                 return 0;
2027         while (max >= min) {
2028                 mid = (min + max) / 2;
2029                 if (ucs > table[mid].last)
2030                         min = mid + 1;
2031                 else if (ucs < table[mid].first)
2032                         max = mid - 1;
2033                 else
2034                         return 1;
2035         }
2036         return 0;
2037 }
2038
2039 static int is_double_width(uint32_t ucs)
2040 {
2041         static const struct interval double_width[] = {
2042                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2043                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2044                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2045                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2046         };
2047         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2048 }
2049
2050 /* acquires console_sem */
2051 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2052 {
2053 #ifdef VT_BUF_VRAM_ONLY
2054 #define FLUSH do { } while(0);
2055 #else
2056 #define FLUSH if (draw_x >= 0) { \
2057         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2058         draw_x = -1; \
2059         }
2060 #endif
2061
2062         int c, tc, ok, n = 0, draw_x = -1;
2063         unsigned int currcons;
2064         unsigned long draw_from = 0, draw_to = 0;
2065         struct vc_data *vc;
2066         unsigned char vc_attr;
2067         struct vt_notifier_param param;
2068         uint8_t rescan;
2069         uint8_t inverse;
2070         uint8_t width;
2071         u16 himask, charmask;
2072         const unsigned char *orig_buf = NULL;
2073         int orig_count;
2074
2075         if (in_interrupt())
2076                 return count;
2077
2078         might_sleep();
2079
2080         acquire_console_sem();
2081         vc = tty->driver_data;
2082         if (vc == NULL) {
2083                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2084                 release_console_sem();
2085                 return 0;
2086         }
2087
2088         currcons = vc->vc_num;
2089         if (!vc_cons_allocated(currcons)) {
2090             /* could this happen? */
2091             static int error = 0;
2092             if (!error) {
2093                 error = 1;
2094                 printk("con_write: tty %d not allocated\n", currcons+1);
2095             }
2096             release_console_sem();
2097             return 0;
2098         }
2099         release_console_sem();
2100
2101         orig_buf = buf;
2102         orig_count = count;
2103
2104         /* At this point 'buf' is guaranteed to be a kernel buffer
2105          * and therefore no access to userspace (and therefore sleeping)
2106          * will be needed.  The con_buf_mtx serializes all tty based
2107          * console rendering and vcs write/read operations.  We hold
2108          * the console spinlock during the entire write.
2109          */
2110
2111         acquire_console_sem();
2112
2113         vc = tty->driver_data;
2114         if (vc == NULL) {
2115                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2116                 release_console_sem();
2117                 goto out;
2118         }
2119
2120         himask = vc->vc_hi_font_mask;
2121         charmask = himask ? 0x1ff : 0xff;
2122
2123         /* undraw cursor first */
2124         if (IS_FG(vc))
2125                 hide_cursor(vc);
2126
2127         param.vc = vc;
2128
2129         while (!tty->stopped && count) {
2130                 int orig = *buf;
2131                 c = orig;
2132                 buf++;
2133                 n++;
2134                 count--;
2135                 rescan = 0;
2136                 inverse = 0;
2137                 width = 1;
2138
2139                 /* Do no translation at all in control states */
2140                 if (vc->vc_state != ESnormal) {
2141                         tc = c;
2142                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2143                     /* Combine UTF-8 into Unicode in vc_utf_char.
2144                      * vc_utf_count is the number of continuation bytes still
2145                      * expected to arrive.
2146                      * vc_npar is the number of continuation bytes arrived so
2147                      * far
2148                      */
2149 rescan_last_byte:
2150                     if ((c & 0xc0) == 0x80) {
2151                         /* Continuation byte received */
2152                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2153                         if (vc->vc_utf_count) {
2154                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2155                             vc->vc_npar++;
2156                             if (--vc->vc_utf_count) {
2157                                 /* Still need some bytes */
2158                                 continue;
2159                             }
2160                             /* Got a whole character */
2161                             c = vc->vc_utf_char;
2162                             /* Reject overlong sequences */
2163                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2164                                         c > utf8_length_changes[vc->vc_npar])
2165                                 c = 0xfffd;
2166                         } else {
2167                             /* Unexpected continuation byte */
2168                             vc->vc_utf_count = 0;
2169                             c = 0xfffd;
2170                         }
2171                     } else {
2172                         /* Single ASCII byte or first byte of a sequence received */
2173                         if (vc->vc_utf_count) {
2174                             /* Continuation byte expected */
2175                             rescan = 1;
2176                             vc->vc_utf_count = 0;
2177                             c = 0xfffd;
2178                         } else if (c > 0x7f) {
2179                             /* First byte of a multibyte sequence received */
2180                             vc->vc_npar = 0;
2181                             if ((c & 0xe0) == 0xc0) {
2182                                 vc->vc_utf_count = 1;
2183                                 vc->vc_utf_char = (c & 0x1f);
2184                             } else if ((c & 0xf0) == 0xe0) {
2185                                 vc->vc_utf_count = 2;
2186                                 vc->vc_utf_char = (c & 0x0f);
2187                             } else if ((c & 0xf8) == 0xf0) {
2188                                 vc->vc_utf_count = 3;
2189                                 vc->vc_utf_char = (c & 0x07);
2190                             } else if ((c & 0xfc) == 0xf8) {
2191                                 vc->vc_utf_count = 4;
2192                                 vc->vc_utf_char = (c & 0x03);
2193                             } else if ((c & 0xfe) == 0xfc) {
2194                                 vc->vc_utf_count = 5;
2195                                 vc->vc_utf_char = (c & 0x01);
2196                             } else {
2197                                 /* 254 and 255 are invalid */
2198                                 c = 0xfffd;
2199                             }
2200                             if (vc->vc_utf_count) {
2201                                 /* Still need some bytes */
2202                                 continue;
2203                             }
2204                         }
2205                         /* Nothing to do if an ASCII byte was received */
2206                     }
2207                     /* End of UTF-8 decoding. */
2208                     /* c is the received character, or U+FFFD for invalid sequences. */
2209                     /* Replace invalid Unicode code points with U+FFFD too */
2210                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2211                         c = 0xfffd;
2212                     tc = c;
2213                 } else {        /* no utf or alternate charset mode */
2214                     tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2215                 }
2216
2217                 param.c = tc;
2218                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2219                                         &param) == NOTIFY_STOP)
2220                         continue;
2221
2222                 /* If the original code was a control character we
2223                  * only allow a glyph to be displayed if the code is
2224                  * not normally used (such as for cursor movement) or
2225                  * if the disp_ctrl mode has been explicitly enabled.
2226                  * Certain characters (as given by the CTRL_ALWAYS
2227                  * bitmap) are always displayed as control characters,
2228                  * as the console would be pretty useless without
2229                  * them; to display an arbitrary font position use the
2230                  * direct-to-font zone in UTF-8 mode.
2231                  */
2232                 ok = tc && (c >= 32 ||
2233                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2234                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2235                         && (c != 127 || vc->vc_disp_ctrl)
2236                         && (c != 128+27);
2237
2238                 if (vc->vc_state == ESnormal && ok) {
2239                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2240                                 if (is_double_width(c))
2241                                         width = 2;
2242                         }
2243                         /* Now try to find out how to display it */
2244                         tc = conv_uni_to_pc(vc, tc);
2245                         if (tc & ~charmask) {
2246                                 if (tc == -1 || tc == -2) {
2247                                     continue; /* nothing to display */
2248                                 }
2249                                 /* Glyph not found */
2250                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2251                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2252                                        This would make absolutely no sense with Unicode in mind,
2253                                        but do this for ASCII characters since a font may lack
2254                                        Unicode mapping info and we don't want to end up with
2255                                        having question marks only. */
2256                                     tc = c;
2257                                 } else {
2258                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2259                                     tc = conv_uni_to_pc(vc, 0xfffd);
2260                                     if (tc < 0) {
2261                                         inverse = 1;
2262                                         tc = conv_uni_to_pc(vc, '?');
2263                                         if (tc < 0) tc = '?';
2264                                     }
2265                                 }
2266                         }
2267
2268                         if (!inverse) {
2269                                 vc_attr = vc->vc_attr;
2270                         } else {
2271                                 /* invert vc_attr */
2272                                 if (!vc->vc_can_do_color) {
2273                                         vc_attr = (vc->vc_attr) ^ 0x08;
2274                                 } else if (vc->vc_hi_font_mask == 0x100) {
2275                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2276                                 } else {
2277                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2278                                 }
2279                                 FLUSH
2280                         }
2281
2282                         while (1) {
2283                                 if (vc->vc_need_wrap || vc->vc_decim)
2284                                         FLUSH
2285                                 if (vc->vc_need_wrap) {
2286                                         cr(vc);
2287                                         lf(vc);
2288                                 }
2289                                 if (vc->vc_decim)
2290                                         insert_char(vc, 1);
2291                                 scr_writew(himask ?
2292                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2293                                              (vc_attr << 8) + tc,
2294                                            (u16 *) vc->vc_pos);
2295                                 if (DO_UPDATE(vc) && draw_x < 0) {
2296                                         draw_x = vc->vc_x;
2297                                         draw_from = vc->vc_pos;
2298                                 }
2299                                 if (vc->vc_x == vc->vc_cols - 1) {
2300                                         vc->vc_need_wrap = vc->vc_decawm;
2301                                         draw_to = vc->vc_pos + 2;
2302                                 } else {
2303                                         vc->vc_x++;
2304                                         draw_to = (vc->vc_pos += 2);
2305                                 }
2306
2307                                 if (!--width) break;
2308
2309                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2310                                 if (tc < 0) tc = ' ';
2311                         }
2312                         notify_write(vc, c);
2313
2314                         if (inverse) {
2315                                 FLUSH
2316                         }
2317
2318                         if (rescan) {
2319                                 rescan = 0;
2320                                 inverse = 0;
2321                                 width = 1;
2322                                 c = orig;
2323                                 goto rescan_last_byte;
2324                         }
2325                         continue;
2326                 }
2327                 FLUSH
2328                 do_con_trol(tty, vc, orig);
2329         }
2330         FLUSH
2331         console_conditional_schedule();
2332         release_console_sem();
2333
2334 out:
2335         notify_update(vc);
2336         return n;
2337 #undef FLUSH
2338 }
2339
2340 /*
2341  * This is the console switching callback.
2342  *
2343  * Doing console switching in a process context allows
2344  * us to do the switches asynchronously (needed when we want
2345  * to switch due to a keyboard interrupt).  Synchronization
2346  * with other console code and prevention of re-entrancy is
2347  * ensured with console_sem.
2348  */
2349 static void console_callback(struct work_struct *ignored)
2350 {
2351         acquire_console_sem();
2352
2353         if (want_console >= 0) {
2354                 if (want_console != fg_console &&
2355                     vc_cons_allocated(want_console)) {
2356                         hide_cursor(vc_cons[fg_console].d);
2357                         change_console(vc_cons[want_console].d);
2358                         /* we only changed when the console had already
2359                            been allocated - a new console is not created
2360                            in an interrupt routine */
2361                 }
2362                 want_console = -1;
2363         }
2364         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2365                 do_poke_blanked_console = 0;
2366                 poke_blanked_console();
2367         }
2368         if (scrollback_delta) {
2369                 struct vc_data *vc = vc_cons[fg_console].d;
2370                 clear_selection();
2371                 if (vc->vc_mode == KD_TEXT)
2372                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2373                 scrollback_delta = 0;
2374         }
2375         if (blank_timer_expired) {
2376                 do_blank_screen(0);
2377                 blank_timer_expired = 0;
2378         }
2379         notify_update(vc_cons[fg_console].d);
2380
2381         release_console_sem();
2382 }
2383
2384 int set_console(int nr)
2385 {
2386         struct vc_data *vc = vc_cons[fg_console].d;
2387
2388         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2389                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2390
2391                 /*
2392                  * Console switch will fail in console_callback() or
2393                  * change_console() so there is no point scheduling
2394                  * the callback
2395                  *
2396                  * Existing set_console() users don't check the return
2397                  * value so this shouldn't break anything
2398                  */
2399                 return -EINVAL;
2400         }
2401
2402         want_console = nr;
2403         schedule_console_callback();
2404
2405         return 0;
2406 }
2407
2408 struct tty_driver *console_driver;
2409
2410 #ifdef CONFIG_VT_CONSOLE
2411
2412 /*
2413  *      Console on virtual terminal
2414  *
2415  * The console must be locked when we get here.
2416  */
2417
2418 static void vt_console_print(struct console *co, const char *b, unsigned count)
2419 {
2420         struct vc_data *vc = vc_cons[fg_console].d;
2421         unsigned char c;
2422         static DEFINE_SPINLOCK(printing_lock);
2423         const ushort *start;
2424         ushort cnt = 0;
2425         ushort myx;
2426
2427         /* console busy or not yet initialized */
2428         if (!printable)
2429                 return;
2430         if (!spin_trylock(&printing_lock))
2431                 return;
2432
2433         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2434                 vc = vc_cons[kmsg_redirect - 1].d;
2435
2436         /* read `x' only after setting currcons properly (otherwise
2437            the `x' macro will read the x of the foreground console). */
2438         myx = vc->vc_x;
2439
2440         if (!vc_cons_allocated(fg_console)) {
2441                 /* impossible */
2442                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2443                 goto quit;
2444         }
2445
2446         if (vc->vc_mode != KD_TEXT)
2447                 goto quit;
2448
2449         /* undraw cursor first */
2450         if (IS_FG(vc))
2451                 hide_cursor(vc);
2452
2453         start = (ushort *)vc->vc_pos;
2454
2455         /* Contrived structure to try to emulate original need_wrap behaviour
2456          * Problems caused when we have need_wrap set on '\n' character */
2457         while (count--) {
2458                 c = *b++;
2459                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2460                         if (cnt > 0) {
2461                                 if (CON_IS_VISIBLE(vc))
2462                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2463                                 vc->vc_x += cnt;
2464                                 if (vc->vc_need_wrap)
2465                                         vc->vc_x--;
2466                                 cnt = 0;
2467                         }
2468                         if (c == 8) {           /* backspace */
2469                                 bs(vc);
2470                                 start = (ushort *)vc->vc_pos;
2471                                 myx = vc->vc_x;
2472                                 continue;
2473                         }
2474                         if (c != 13)
2475                                 lf(vc);
2476                         cr(vc);
2477                         start = (ushort *)vc->vc_pos;
2478                         myx = vc->vc_x;
2479                         if (c == 10 || c == 13)
2480                                 continue;
2481                 }
2482                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2483                 notify_write(vc, c);
2484                 cnt++;
2485                 if (myx == vc->vc_cols - 1) {
2486                         vc->vc_need_wrap = 1;
2487                         continue;
2488                 }
2489                 vc->vc_pos += 2;
2490                 myx++;
2491         }
2492         if (cnt > 0) {
2493                 if (CON_IS_VISIBLE(vc))
2494                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2495                 vc->vc_x += cnt;
2496                 if (vc->vc_x == vc->vc_cols) {
2497                         vc->vc_x--;
2498                         vc->vc_need_wrap = 1;
2499                 }
2500         }
2501         set_cursor(vc);
2502         notify_update(vc);
2503
2504 quit:
2505         spin_unlock(&printing_lock);
2506 }
2507
2508 static struct tty_driver *vt_console_device(struct console *c, int *index)
2509 {
2510         *index = c->index ? c->index-1 : fg_console;
2511         return console_driver;
2512 }
2513
2514 static struct console vt_console_driver = {
2515         .name           = "tty",
2516         .write          = vt_console_print,
2517         .device         = vt_console_device,
2518         .unblank        = unblank_screen,
2519         .flags          = CON_PRINTBUFFER,
2520         .index          = -1,
2521 };
2522 #endif
2523
2524 /*
2525  *      Handling of Linux-specific VC ioctls
2526  */
2527
2528 /*
2529  * Generally a bit racy with respect to console_sem().
2530  *
2531  * There are some functions which don't need it.
2532  *
2533  * There are some functions which can sleep for arbitrary periods
2534  * (paste_selection) but we don't need the lock there anyway.
2535  *
2536  * set_selection has locking, and definitely needs it
2537  */
2538
2539 int tioclinux(struct tty_struct *tty, unsigned long arg)
2540 {
2541         char type, data;
2542         char __user *p = (char __user *)arg;
2543         int lines;
2544         int ret;
2545
2546         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2547                 return -EINVAL;
2548         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2549                 return -EPERM;
2550         if (get_user(type, p))
2551                 return -EFAULT;
2552         ret = 0;
2553
2554         lock_kernel();
2555
2556         switch (type)
2557         {
2558                 case TIOCL_SETSEL:
2559                         acquire_console_sem();
2560                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2561                         release_console_sem();
2562                         break;
2563                 case TIOCL_PASTESEL:
2564                         ret = paste_selection(tty);
2565                         break;
2566                 case TIOCL_UNBLANKSCREEN:
2567                         acquire_console_sem();
2568                         unblank_screen();
2569                         release_console_sem();
2570                         break;
2571                 case TIOCL_SELLOADLUT:
2572                         ret = sel_loadlut(p);
2573                         break;
2574                 case TIOCL_GETSHIFTSTATE:
2575
2576         /*
2577          * Make it possible to react to Shift+Mousebutton.
2578          * Note that 'shift_state' is an undocumented
2579          * kernel-internal variable; programs not closely
2580          * related to the kernel should not use this.
2581          */
2582                         data = shift_state;
2583                         ret = __put_user(data, p);
2584                         break;
2585                 case TIOCL_GETMOUSEREPORTING:
2586                         data = mouse_reporting();
2587                         ret = __put_user(data, p);
2588                         break;
2589                 case TIOCL_SETVESABLANK:
2590                         ret = set_vesa_blanking(p);
2591                         break;
2592                 case TIOCL_GETKMSGREDIRECT:
2593                         data = kmsg_redirect;
2594                         ret = __put_user(data, p);
2595                         break;
2596                 case TIOCL_SETKMSGREDIRECT:
2597                         if (!capable(CAP_SYS_ADMIN)) {
2598                                 ret = -EPERM;
2599                         } else {
2600                                 if (get_user(data, p+1))
2601                                         ret = -EFAULT;
2602                                 else
2603                                         kmsg_redirect = data;
2604                         }
2605                         break;
2606                 case TIOCL_GETFGCONSOLE:
2607                         ret = fg_console;
2608                         break;
2609                 case TIOCL_SCROLLCONSOLE:
2610                         if (get_user(lines, (s32 __user *)(p+4))) {
2611                                 ret = -EFAULT;
2612                         } else {
2613                                 scrollfront(vc_cons[fg_console].d, lines);
2614                                 ret = 0;
2615                         }
2616                         break;
2617                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2618                         acquire_console_sem();
2619                         ignore_poke = 1;
2620                         do_blank_screen(0);
2621                         release_console_sem();
2622                         break;
2623                 case TIOCL_BLANKEDSCREEN:
2624                         ret = console_blanked;
2625                         break;
2626                 default:
2627                         ret = -EINVAL;
2628                         break;
2629         }
2630         unlock_kernel();
2631         return ret;
2632 }
2633
2634 /*
2635  * /dev/ttyN handling
2636  */
2637
2638 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2639 {
2640         int     retval;
2641
2642         retval = do_con_write(tty, buf, count);
2643         con_flush_chars(tty);
2644
2645         return retval;
2646 }
2647
2648 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2649 {
2650         if (in_interrupt())
2651                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2652         return do_con_write(tty, &ch, 1);
2653 }
2654
2655 static int con_write_room(struct tty_struct *tty)
2656 {
2657         if (tty->stopped)
2658                 return 0;
2659         return 4096;            /* No limit, really; we're not buffering */
2660 }
2661
2662 static int con_chars_in_buffer(struct tty_struct *tty)
2663 {
2664         return 0;               /* we're not buffering */
2665 }
2666
2667 /*
2668  * con_throttle and con_unthrottle are only used for
2669  * paste_selection(), which has to stuff in a large number of
2670  * characters...
2671  */
2672 static void con_throttle(struct tty_struct *tty)
2673 {
2674 }
2675
2676 static void con_unthrottle(struct tty_struct *tty)
2677 {
2678         struct vc_data *vc = tty->driver_data;
2679
2680         wake_up_interruptible(&vc->paste_wait);
2681 }
2682
2683 /*
2684  * Turn the Scroll-Lock LED on when the tty is stopped
2685  */
2686 static void con_stop(struct tty_struct *tty)
2687 {
2688         int console_num;
2689         if (!tty)
2690                 return;
2691         console_num = tty->index;
2692         if (!vc_cons_allocated(console_num))
2693                 return;
2694         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2695         set_leds();
2696 }
2697
2698 /*
2699  * Turn the Scroll-Lock LED off when the console is started
2700  */
2701 static void con_start(struct tty_struct *tty)
2702 {
2703         int console_num;
2704         if (!tty)
2705                 return;
2706         console_num = tty->index;
2707         if (!vc_cons_allocated(console_num))
2708                 return;
2709         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2710         set_leds();
2711 }
2712
2713 static void con_flush_chars(struct tty_struct *tty)
2714 {
2715         struct vc_data *vc;
2716
2717         if (in_interrupt())     /* from flush_to_ldisc */
2718                 return;
2719
2720         /* if we race with con_close(), vt may be null */
2721         acquire_console_sem();
2722         vc = tty->driver_data;
2723         if (vc)
2724                 set_cursor(vc);
2725         release_console_sem();
2726 }
2727
2728 /*
2729  * Allocate the console screen memory.
2730  */
2731 static int con_open(struct tty_struct *tty, struct file *filp)
2732 {
2733         unsigned int currcons = tty->index;
2734         int ret = 0;
2735
2736         acquire_console_sem();
2737         if (tty->driver_data == NULL) {
2738                 ret = vc_allocate(currcons);
2739                 if (ret == 0) {
2740                         struct vc_data *vc = vc_cons[currcons].d;
2741                         tty->driver_data = vc;
2742                         vc->vc_tty = tty;
2743
2744                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2745                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2746                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2747                         }
2748                         if (vc->vc_utf)
2749                                 tty->termios->c_iflag |= IUTF8;
2750                         else
2751                                 tty->termios->c_iflag &= ~IUTF8;
2752                         release_console_sem();
2753                         vcs_make_sysfs(tty);
2754                         return ret;
2755                 }
2756         }
2757         release_console_sem();
2758         return ret;
2759 }
2760
2761 /*
2762  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2763  * and taking a ref against the tty while we're in the process of forgetting
2764  * about it and cleaning things up.
2765  *
2766  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2767  */
2768 static void con_close(struct tty_struct *tty, struct file *filp)
2769 {
2770         mutex_lock(&tty_mutex);
2771         acquire_console_sem();
2772         if (tty && tty->count == 1) {
2773                 struct vc_data *vc = tty->driver_data;
2774
2775                 if (vc)
2776                         vc->vc_tty = NULL;
2777                 tty->driver_data = NULL;
2778                 release_console_sem();
2779                 vcs_remove_sysfs(tty);
2780                 mutex_unlock(&tty_mutex);
2781                 /*
2782                  * tty_mutex is released, but we still hold BKL, so there is
2783                  * still exclusion against init_dev()
2784                  */
2785                 return;
2786         }
2787         release_console_sem();
2788         mutex_unlock(&tty_mutex);
2789 }
2790
2791 static int default_italic_color    = 2; // green (ASCII)
2792 static int default_underline_color = 3; // cyan (ASCII)
2793 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2794 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2795
2796 static void vc_init(struct vc_data *vc, unsigned int rows,
2797                     unsigned int cols, int do_clear)
2798 {
2799         int j, k ;
2800
2801         vc->vc_cols = cols;
2802         vc->vc_rows = rows;
2803         vc->vc_size_row = cols << 1;
2804         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2805
2806         set_origin(vc);
2807         vc->vc_pos = vc->vc_origin;
2808         reset_vc(vc);
2809         for (j=k=0; j<16; j++) {
2810                 vc->vc_palette[k++] = default_red[j] ;
2811                 vc->vc_palette[k++] = default_grn[j] ;
2812                 vc->vc_palette[k++] = default_blu[j] ;
2813         }
2814         vc->vc_def_color       = 0x07;   /* white */
2815         vc->vc_ulcolor         = default_underline_color;
2816         vc->vc_itcolor         = default_italic_color;
2817         vc->vc_halfcolor       = 0x08;   /* grey */
2818         init_waitqueue_head(&vc->paste_wait);
2819         reset_terminal(vc, do_clear);
2820 }
2821
2822 /*
2823  * This routine initializes console interrupts, and does nothing
2824  * else. If you want the screen to clear, call tty_write with
2825  * the appropriate escape-sequence.
2826  */
2827
2828 static int __init con_init(void)
2829 {
2830         const char *display_desc = NULL;
2831         struct vc_data *vc;
2832         unsigned int currcons = 0, i;
2833
2834         acquire_console_sem();
2835
2836         if (conswitchp)
2837                 display_desc = conswitchp->con_startup();
2838         if (!display_desc) {
2839                 fg_console = 0;
2840                 release_console_sem();
2841                 return 0;
2842         }
2843
2844         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2845                 struct con_driver *con_driver = &registered_con_driver[i];
2846
2847                 if (con_driver->con == NULL) {
2848                         con_driver->con = conswitchp;
2849                         con_driver->desc = display_desc;
2850                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2851                         con_driver->first = 0;
2852                         con_driver->last = MAX_NR_CONSOLES - 1;
2853                         break;
2854                 }
2855         }
2856
2857         for (i = 0; i < MAX_NR_CONSOLES; i++)
2858                 con_driver_map[i] = conswitchp;
2859
2860         if (blankinterval) {
2861                 blank_state = blank_normal_wait;
2862                 mod_timer(&console_timer, jiffies + blankinterval);
2863         }
2864
2865         /*
2866          * kmalloc is not running yet - we use the bootmem allocator.
2867          */
2868         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2869                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2870                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2871                 visual_init(vc, currcons, 1);
2872                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2873                 vc->vc_kmalloced = 0;
2874                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2875                         currcons || !vc->vc_sw->con_save_screen);
2876         }
2877         currcons = fg_console = 0;
2878         master_display_fg = vc = vc_cons[currcons].d;
2879         set_origin(vc);
2880         save_screen(vc);
2881         gotoxy(vc, vc->vc_x, vc->vc_y);
2882         csi_J(vc, 0);
2883         update_screen(vc);
2884         printk("Console: %s %s %dx%d",
2885                 vc->vc_can_do_color ? "colour" : "mono",
2886                 display_desc, vc->vc_cols, vc->vc_rows);
2887         printable = 1;
2888         printk("\n");
2889
2890         release_console_sem();
2891
2892 #ifdef CONFIG_VT_CONSOLE
2893         register_console(&vt_console_driver);
2894 #endif
2895         return 0;
2896 }
2897 console_initcall(con_init);
2898
2899 static const struct tty_operations con_ops = {
2900         .open = con_open,
2901         .close = con_close,
2902         .write = con_write,
2903         .write_room = con_write_room,
2904         .put_char = con_put_char,
2905         .flush_chars = con_flush_chars,
2906         .chars_in_buffer = con_chars_in_buffer,
2907         .ioctl = vt_ioctl,
2908         .stop = con_stop,
2909         .start = con_start,
2910         .throttle = con_throttle,
2911         .unthrottle = con_unthrottle,
2912 };
2913
2914 int __init vty_init(void)
2915 {
2916         vcs_init();
2917
2918         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2919         if (!console_driver)
2920                 panic("Couldn't allocate console driver\n");
2921         console_driver->owner = THIS_MODULE;
2922         console_driver->name = "tty";
2923         console_driver->name_base = 1;
2924         console_driver->major = TTY_MAJOR;
2925         console_driver->minor_start = 1;
2926         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2927         console_driver->init_termios = tty_std_termios;
2928         if (default_utf8)
2929                 console_driver->init_termios.c_iflag |= IUTF8;
2930         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2931         tty_set_operations(console_driver, &con_ops);
2932         if (tty_register_driver(console_driver))
2933                 panic("Couldn't register console driver\n");
2934
2935         kbd_init();
2936         console_map_init();
2937 #ifdef CONFIG_PROM_CONSOLE
2938         prom_con_init();
2939 #endif
2940 #ifdef CONFIG_MDA_CONSOLE
2941         mda_console_init();
2942 #endif
2943         return 0;
2944 }
2945
2946 #ifndef VT_SINGLE_DRIVER
2947 #include <linux/device.h>
2948
2949 static struct class *vtconsole_class;
2950
2951 static int bind_con_driver(const struct consw *csw, int first, int last,
2952                            int deflt)
2953 {
2954         struct module *owner = csw->owner;
2955         const char *desc = NULL;
2956         struct con_driver *con_driver;
2957         int i, j = -1, k = -1, retval = -ENODEV;
2958
2959         if (!try_module_get(owner))
2960                 return -ENODEV;
2961
2962         acquire_console_sem();
2963
2964         /* check if driver is registered */
2965         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2966                 con_driver = &registered_con_driver[i];
2967
2968                 if (con_driver->con == csw) {
2969                         desc = con_driver->desc;
2970                         retval = 0;
2971                         break;
2972                 }
2973         }
2974
2975         if (retval)
2976                 goto err;
2977
2978         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2979                 csw->con_startup();
2980                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2981         }
2982
2983         if (deflt) {
2984                 if (conswitchp)
2985                         module_put(conswitchp->owner);
2986
2987                 __module_get(owner);
2988                 conswitchp = csw;
2989         }
2990
2991         first = max(first, con_driver->first);
2992         last = min(last, con_driver->last);
2993
2994         for (i = first; i <= last; i++) {
2995                 int old_was_color;
2996                 struct vc_data *vc = vc_cons[i].d;
2997
2998                 if (con_driver_map[i])
2999                         module_put(con_driver_map[i]->owner);
3000                 __module_get(owner);
3001                 con_driver_map[i] = csw;
3002
3003                 if (!vc || !vc->vc_sw)
3004                         continue;
3005
3006                 j = i;
3007
3008                 if (CON_IS_VISIBLE(vc)) {
3009                         k = i;
3010                         save_screen(vc);
3011                 }
3012
3013                 old_was_color = vc->vc_can_do_color;
3014                 vc->vc_sw->con_deinit(vc);
3015                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3016                 visual_init(vc, i, 0);
3017                 set_origin(vc);
3018                 update_attr(vc);
3019
3020                 /* If the console changed between mono <-> color, then
3021                  * the attributes in the screenbuf will be wrong.  The
3022                  * following resets all attributes to something sane.
3023                  */
3024                 if (old_was_color != vc->vc_can_do_color)
3025                         clear_buffer_attributes(vc);
3026         }
3027
3028         printk("Console: switching ");
3029         if (!deflt)
3030                 printk("consoles %d-%d ", first+1, last+1);
3031         if (j >= 0) {
3032                 struct vc_data *vc = vc_cons[j].d;
3033
3034                 printk("to %s %s %dx%d\n",
3035                        vc->vc_can_do_color ? "colour" : "mono",
3036                        desc, vc->vc_cols, vc->vc_rows);
3037
3038                 if (k >= 0) {
3039                         vc = vc_cons[k].d;
3040                         update_screen(vc);
3041                 }
3042         } else
3043                 printk("to %s\n", desc);
3044
3045         retval = 0;
3046 err:
3047         release_console_sem();
3048         module_put(owner);
3049         return retval;
3050 };
3051
3052 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3053 static int con_is_graphics(const struct consw *csw, int first, int last)
3054 {
3055         int i, retval = 0;
3056
3057         for (i = first; i <= last; i++) {
3058                 struct vc_data *vc = vc_cons[i].d;
3059
3060                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3061                         retval = 1;
3062                         break;
3063                 }
3064         }
3065
3066         return retval;
3067 }
3068
3069 /**
3070  * unbind_con_driver - unbind a console driver
3071  * @csw: pointer to console driver to unregister
3072  * @first: first in range of consoles that @csw should be unbound from
3073  * @last: last in range of consoles that @csw should be unbound from
3074  * @deflt: should next bound console driver be default after @csw is unbound?
3075  *
3076  * To unbind a driver from all possible consoles, pass 0 as @first and
3077  * %MAX_NR_CONSOLES as @last.
3078  *
3079  * @deflt controls whether the console that ends up replacing @csw should be
3080  * the default console.
3081  *
3082  * RETURNS:
3083  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3084  * or 0 on success.
3085  */
3086 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3087 {
3088         struct module *owner = csw->owner;
3089         const struct consw *defcsw = NULL;
3090         struct con_driver *con_driver = NULL, *con_back = NULL;
3091         int i, retval = -ENODEV;
3092
3093         if (!try_module_get(owner))
3094                 return -ENODEV;
3095
3096         acquire_console_sem();
3097
3098         /* check if driver is registered and if it is unbindable */
3099         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3100                 con_driver = &registered_con_driver[i];
3101
3102                 if (con_driver->con == csw &&
3103                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3104                         retval = 0;
3105                         break;
3106                 }
3107         }
3108
3109         if (retval) {
3110                 release_console_sem();
3111                 goto err;
3112         }
3113
3114         retval = -ENODEV;
3115
3116         /* check if backup driver exists */
3117         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3118                 con_back = &registered_con_driver[i];
3119
3120                 if (con_back->con &&
3121                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3122                         defcsw = con_back->con;
3123                         retval = 0;
3124                         break;
3125                 }
3126         }
3127
3128         if (retval) {
3129                 release_console_sem();
3130                 goto err;
3131         }
3132
3133         if (!con_is_bound(csw)) {
3134                 release_console_sem();
3135                 goto err;
3136         }
3137
3138         first = max(first, con_driver->first);
3139         last = min(last, con_driver->last);
3140
3141         for (i = first; i <= last; i++) {
3142                 if (con_driver_map[i] == csw) {
3143                         module_put(csw->owner);
3144                         con_driver_map[i] = NULL;
3145                 }
3146         }
3147
3148         if (!con_is_bound(defcsw)) {
3149                 const struct consw *defconsw = conswitchp;
3150
3151                 defcsw->con_startup();
3152                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3153                 /*
3154                  * vgacon may change the default driver to point
3155                  * to dummycon, we restore it here...
3156                  */
3157                 conswitchp = defconsw;
3158         }
3159
3160         if (!con_is_bound(csw))
3161                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3162
3163         release_console_sem();
3164         /* ignore return value, binding should not fail */
3165         bind_con_driver(defcsw, first, last, deflt);
3166 err:
3167         module_put(owner);
3168         return retval;
3169
3170 }
3171 EXPORT_SYMBOL(unbind_con_driver);
3172
3173 static int vt_bind(struct con_driver *con)
3174 {
3175         const struct consw *defcsw = NULL, *csw = NULL;
3176         int i, more = 1, first = -1, last = -1, deflt = 0;
3177
3178         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3179             con_is_graphics(con->con, con->first, con->last))
3180                 goto err;
3181
3182         csw = con->con;
3183
3184         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3185                 struct con_driver *con = &registered_con_driver[i];
3186
3187                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3188                         defcsw = con->con;
3189                         break;
3190                 }
3191         }
3192
3193         if (!defcsw)
3194                 goto err;
3195
3196         while (more) {
3197                 more = 0;
3198
3199                 for (i = con->first; i <= con->last; i++) {
3200                         if (con_driver_map[i] == defcsw) {
3201                                 if (first == -1)
3202                                         first = i;
3203                                 last = i;
3204                                 more = 1;
3205                         } else if (first != -1)
3206                                 break;
3207                 }
3208
3209                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3210                         deflt = 1;
3211
3212                 if (first != -1)
3213                         bind_con_driver(csw, first, last, deflt);
3214
3215                 first = -1;
3216                 last = -1;
3217                 deflt = 0;
3218         }
3219
3220 err:
3221         return 0;
3222 }
3223
3224 static int vt_unbind(struct con_driver *con)
3225 {
3226         const struct consw *csw = NULL;
3227         int i, more = 1, first = -1, last = -1, deflt = 0;
3228
3229         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3230             con_is_graphics(con->con, con->first, con->last))
3231                 goto err;
3232
3233         csw = con->con;
3234
3235         while (more) {
3236                 more = 0;
3237
3238                 for (i = con->first; i <= con->last; i++) {
3239                         if (con_driver_map[i] == csw) {
3240                                 if (first == -1)
3241                                         first = i;
3242                                 last = i;
3243                                 more = 1;
3244                         } else if (first != -1)
3245                                 break;
3246                 }
3247
3248                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3249                         deflt = 1;
3250
3251                 if (first != -1)
3252                         unbind_con_driver(csw, first, last, deflt);
3253
3254                 first = -1;
3255                 last = -1;
3256                 deflt = 0;
3257         }
3258
3259 err:
3260         return 0;
3261 }
3262 #else
3263 static inline int vt_bind(struct con_driver *con)
3264 {
3265         return 0;
3266 }
3267 static inline int vt_unbind(struct con_driver *con)
3268 {
3269         return 0;
3270 }
3271 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3272
3273 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3274                           const char *buf, size_t count)
3275 {
3276         struct con_driver *con = dev_get_drvdata(dev);
3277         int bind = simple_strtoul(buf, NULL, 0);
3278
3279         if (bind)
3280                 vt_bind(con);
3281         else
3282                 vt_unbind(con);
3283
3284         return count;
3285 }
3286
3287 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3288                          char *buf)
3289 {
3290         struct con_driver *con = dev_get_drvdata(dev);
3291         int bind = con_is_bound(con->con);
3292
3293         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3294 }
3295
3296 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3297                          char *buf)
3298 {
3299         struct con_driver *con = dev_get_drvdata(dev);
3300
3301         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3302                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3303                          con->desc);
3304
3305 }
3306
3307 static struct device_attribute device_attrs[] = {
3308         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3309         __ATTR(name, S_IRUGO, show_name, NULL),
3310 };
3311
3312 static int vtconsole_init_device(struct con_driver *con)
3313 {
3314         int i;
3315         int error = 0;
3316
3317         con->flag |= CON_DRIVER_FLAG_ATTR;
3318         dev_set_drvdata(con->dev, con);
3319         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3320                 error = device_create_file(con->dev, &device_attrs[i]);
3321                 if (error)
3322                         break;
3323         }
3324
3325         if (error) {
3326                 while (--i >= 0)
3327                         device_remove_file(con->dev, &device_attrs[i]);
3328                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3329         }
3330
3331         return error;
3332 }
3333
3334 static void vtconsole_deinit_device(struct con_driver *con)
3335 {
3336         int i;
3337
3338         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3339                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3340                         device_remove_file(con->dev, &device_attrs[i]);
3341                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3342         }
3343 }
3344
3345 /**
3346  * con_is_bound - checks if driver is bound to the console
3347  * @csw: console driver
3348  *
3349  * RETURNS: zero if unbound, nonzero if bound
3350  *
3351  * Drivers can call this and if zero, they should release
3352  * all resources allocated on con_startup()
3353  */
3354 int con_is_bound(const struct consw *csw)
3355 {
3356         int i, bound = 0;
3357
3358         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3359                 if (con_driver_map[i] == csw) {
3360                         bound = 1;
3361                         break;
3362                 }
3363         }
3364
3365         return bound;
3366 }
3367 EXPORT_SYMBOL(con_is_bound);
3368
3369 /**
3370  * register_con_driver - register console driver to console layer
3371  * @csw: console driver
3372  * @first: the first console to take over, minimum value is 0
3373  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3374  *
3375  * DESCRIPTION: This function registers a console driver which can later
3376  * bind to a range of consoles specified by @first and @last. It will
3377  * also initialize the console driver by calling con_startup().
3378  */
3379 int register_con_driver(const struct consw *csw, int first, int last)
3380 {
3381         struct module *owner = csw->owner;
3382         struct con_driver *con_driver;
3383         const char *desc;
3384         int i, retval = 0;
3385
3386         if (!try_module_get(owner))
3387                 return -ENODEV;
3388
3389         acquire_console_sem();
3390
3391         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3392                 con_driver = &registered_con_driver[i];
3393
3394                 /* already registered */
3395                 if (con_driver->con == csw)
3396                         retval = -EINVAL;
3397         }
3398
3399         if (retval)
3400                 goto err;
3401
3402         desc = csw->con_startup();
3403
3404         if (!desc)
3405                 goto err;
3406
3407         retval = -EINVAL;
3408
3409         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3410                 con_driver = &registered_con_driver[i];
3411
3412                 if (con_driver->con == NULL) {
3413                         con_driver->con = csw;
3414                         con_driver->desc = desc;
3415                         con_driver->node = i;
3416                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3417                                            CON_DRIVER_FLAG_INIT;
3418                         con_driver->first = first;
3419                         con_driver->last = last;
3420                         retval = 0;
3421                         break;
3422                 }
3423         }
3424
3425         if (retval)
3426                 goto err;
3427
3428         con_driver->dev = device_create(vtconsole_class, NULL,
3429                                         MKDEV(0, con_driver->node),
3430                                         "vtcon%i", con_driver->node);
3431
3432         if (IS_ERR(con_driver->dev)) {
3433                 printk(KERN_WARNING "Unable to create device for %s; "
3434                        "errno = %ld\n", con_driver->desc,
3435                        PTR_ERR(con_driver->dev));
3436                 con_driver->dev = NULL;
3437         } else {
3438                 vtconsole_init_device(con_driver);
3439         }
3440
3441 err:
3442         release_console_sem();
3443         module_put(owner);
3444         return retval;
3445 }
3446 EXPORT_SYMBOL(register_con_driver);
3447
3448 /**
3449  * unregister_con_driver - unregister console driver from console layer
3450  * @csw: console driver
3451  *
3452  * DESCRIPTION: All drivers that registers to the console layer must
3453  * call this function upon exit, or if the console driver is in a state
3454  * where it won't be able to handle console services, such as the
3455  * framebuffer console without loaded framebuffer drivers.
3456  *
3457  * The driver must unbind first prior to unregistration.
3458  */
3459 int unregister_con_driver(const struct consw *csw)
3460 {
3461         int i, retval = -ENODEV;
3462
3463         acquire_console_sem();
3464
3465         /* cannot unregister a bound driver */
3466         if (con_is_bound(csw))
3467                 goto err;
3468
3469         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3470                 struct con_driver *con_driver = &registered_con_driver[i];
3471
3472                 if (con_driver->con == csw &&
3473                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3474                         vtconsole_deinit_device(con_driver);
3475                         device_destroy(vtconsole_class,
3476                                        MKDEV(0, con_driver->node));
3477                         con_driver->con = NULL;
3478                         con_driver->desc = NULL;
3479                         con_driver->dev = NULL;
3480                         con_driver->node = 0;
3481                         con_driver->flag = 0;
3482                         con_driver->first = 0;
3483                         con_driver->last = 0;
3484                         retval = 0;
3485                         break;
3486                 }
3487         }
3488 err:
3489         release_console_sem();
3490         return retval;
3491 }
3492 EXPORT_SYMBOL(unregister_con_driver);
3493
3494 /*
3495  *      If we support more console drivers, this function is used
3496  *      when a driver wants to take over some existing consoles
3497  *      and become default driver for newly opened ones.
3498  *
3499  *      take_over_console is basically a register followed by unbind
3500  */
3501 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3502 {
3503         int err;
3504
3505         err = register_con_driver(csw, first, last);
3506
3507         if (!err)
3508                 bind_con_driver(csw, first, last, deflt);
3509
3510         return err;
3511 }
3512
3513 /*
3514  * give_up_console is a wrapper to unregister_con_driver. It will only
3515  * work if driver is fully unbound.
3516  */
3517 void give_up_console(const struct consw *csw)
3518 {
3519         unregister_con_driver(csw);
3520 }
3521
3522 static int __init vtconsole_class_init(void)
3523 {
3524         int i;
3525
3526         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3527         if (IS_ERR(vtconsole_class)) {
3528                 printk(KERN_WARNING "Unable to create vt console class; "
3529                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3530                 vtconsole_class = NULL;
3531         }
3532
3533         /* Add system drivers to sysfs */
3534         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3535                 struct con_driver *con = &registered_con_driver[i];
3536
3537                 if (con->con && !con->dev) {
3538                         con->dev = device_create(vtconsole_class, NULL,
3539                                                  MKDEV(0, con->node),
3540                                                  "vtcon%i", con->node);
3541
3542                         if (IS_ERR(con->dev)) {
3543                                 printk(KERN_WARNING "Unable to create "
3544                                        "device for %s; errno = %ld\n",
3545                                        con->desc, PTR_ERR(con->dev));
3546                                 con->dev = NULL;
3547                         } else {
3548                                 vtconsole_init_device(con);
3549                         }
3550                 }
3551         }
3552
3553         return 0;
3554 }
3555 postcore_initcall(vtconsole_class_init);
3556
3557 #endif
3558
3559 /*
3560  *      Screen blanking
3561  */
3562
3563 static int set_vesa_blanking(char __user *p)
3564 {
3565         unsigned int mode;
3566
3567         if (get_user(mode, p + 1))
3568                 return -EFAULT;
3569
3570         vesa_blank_mode = (mode < 4) ? mode : 0;
3571         return 0;
3572 }
3573
3574 void do_blank_screen(int entering_gfx)
3575 {
3576         struct vc_data *vc = vc_cons[fg_console].d;
3577         int i;
3578
3579         WARN_CONSOLE_UNLOCKED();
3580
3581         if (console_blanked) {
3582                 if (blank_state == blank_vesa_wait) {
3583                         blank_state = blank_off;
3584                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3585                 }
3586                 return;
3587         }
3588
3589         /* entering graphics mode? */
3590         if (entering_gfx) {
3591                 hide_cursor(vc);
3592                 save_screen(vc);
3593                 vc->vc_sw->con_blank(vc, -1, 1);
3594                 console_blanked = fg_console + 1;
3595                 blank_state = blank_off;
3596                 set_origin(vc);
3597                 return;
3598         }
3599
3600         if (blank_state != blank_normal_wait)
3601                 return;
3602         blank_state = blank_off;
3603
3604         /* don't blank graphics */
3605         if (vc->vc_mode != KD_TEXT) {
3606                 console_blanked = fg_console + 1;
3607                 return;
3608         }
3609
3610         hide_cursor(vc);
3611         del_timer_sync(&console_timer);
3612         blank_timer_expired = 0;
3613
3614         save_screen(vc);
3615         /* In case we need to reset origin, blanking hook returns 1 */
3616         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3617         console_blanked = fg_console + 1;
3618         if (i)
3619                 set_origin(vc);
3620
3621         if (console_blank_hook && console_blank_hook(1))
3622                 return;
3623
3624         if (vesa_off_interval && vesa_blank_mode) {
3625                 blank_state = blank_vesa_wait;
3626                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3627         }
3628 }
3629 EXPORT_SYMBOL(do_blank_screen);
3630
3631 /*
3632  * Called by timer as well as from vt_console_driver
3633  */
3634 void do_unblank_screen(int leaving_gfx)
3635 {
3636         struct vc_data *vc;
3637
3638         /* This should now always be called from a "sane" (read: can schedule)
3639          * context for the sake of the low level drivers, except in the special
3640          * case of oops_in_progress
3641          */
3642         if (!oops_in_progress)
3643                 might_sleep();
3644
3645         WARN_CONSOLE_UNLOCKED();
3646
3647         ignore_poke = 0;
3648         if (!console_blanked)
3649                 return;
3650         if (!vc_cons_allocated(fg_console)) {
3651                 /* impossible */
3652                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3653                 return;
3654         }
3655         vc = vc_cons[fg_console].d;
3656         if (vc->vc_mode != KD_TEXT)
3657                 return; /* but leave console_blanked != 0 */
3658
3659         if (blankinterval) {
3660                 mod_timer(&console_timer, jiffies + blankinterval);
3661                 blank_state = blank_normal_wait;
3662         }
3663
3664         console_blanked = 0;
3665         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3666                 /* Low-level driver cannot restore -> do it ourselves */
3667                 update_screen(vc);
3668         if (console_blank_hook)
3669                 console_blank_hook(0);
3670         set_palette(vc);
3671         set_cursor(vc);
3672 }
3673 EXPORT_SYMBOL(do_unblank_screen);
3674
3675 /*
3676  * This is called by the outside world to cause a forced unblank, mostly for
3677  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3678  * call it with 1 as an argument and so force a mode restore... that may kill
3679  * X or at least garbage the screen but would also make the Oops visible...
3680  */
3681 void unblank_screen(void)
3682 {
3683         do_unblank_screen(0);
3684 }
3685
3686 /*
3687  * We defer the timer blanking to work queue so it can take the console mutex
3688  * (console operations can still happen at irq time, but only from printk which
3689  * has the console mutex. Not perfect yet, but better than no locking
3690  */
3691 static void blank_screen_t(unsigned long dummy)
3692 {
3693         if (unlikely(!keventd_up())) {
3694                 mod_timer(&console_timer, jiffies + blankinterval);
3695                 return;
3696         }
3697         blank_timer_expired = 1;
3698         schedule_work(&console_work);
3699 }
3700
3701 void poke_blanked_console(void)
3702 {
3703         WARN_CONSOLE_UNLOCKED();
3704
3705         /* Add this so we quickly catch whoever might call us in a non
3706          * safe context. Nowadays, unblank_screen() isn't to be called in
3707          * atomic contexts and is allowed to schedule (with the special case
3708          * of oops_in_progress, but that isn't of any concern for this
3709          * function. --BenH.
3710          */
3711         might_sleep();
3712
3713         /* This isn't perfectly race free, but a race here would be mostly harmless,
3714          * at worse, we'll do a spurrious blank and it's unlikely
3715          */
3716         del_timer(&console_timer);
3717         blank_timer_expired = 0;
3718
3719         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3720                 return;
3721         if (console_blanked)
3722                 unblank_screen();
3723         else if (blankinterval) {
3724                 mod_timer(&console_timer, jiffies + blankinterval);
3725                 blank_state = blank_normal_wait;
3726         }
3727 }
3728
3729 /*
3730  *      Palettes
3731  */
3732
3733 static void set_palette(struct vc_data *vc)
3734 {
3735         WARN_CONSOLE_UNLOCKED();
3736
3737         if (vc->vc_mode != KD_GRAPHICS)
3738                 vc->vc_sw->con_set_palette(vc, color_table);
3739 }
3740
3741 static int set_get_cmap(unsigned char __user *arg, int set)
3742 {
3743     int i, j, k;
3744
3745     WARN_CONSOLE_UNLOCKED();
3746
3747     for (i = 0; i < 16; i++)
3748         if (set) {
3749             get_user(default_red[i], arg++);
3750             get_user(default_grn[i], arg++);
3751             get_user(default_blu[i], arg++);
3752         } else {
3753             put_user(default_red[i], arg++);
3754             put_user(default_grn[i], arg++);
3755             put_user(default_blu[i], arg++);
3756         }
3757     if (set) {
3758         for (i = 0; i < MAX_NR_CONSOLES; i++)
3759             if (vc_cons_allocated(i)) {
3760                 for (j = k = 0; j < 16; j++) {
3761                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3762                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3763                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3764                 }
3765                 set_palette(vc_cons[i].d);
3766             }
3767     }
3768     return 0;
3769 }
3770
3771 /*
3772  * Load palette into the DAC registers. arg points to a colour
3773  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3774  */
3775
3776 int con_set_cmap(unsigned char __user *arg)
3777 {
3778         int rc;
3779
3780         acquire_console_sem();
3781         rc = set_get_cmap (arg,1);
3782         release_console_sem();
3783
3784         return rc;
3785 }
3786
3787 int con_get_cmap(unsigned char __user *arg)
3788 {
3789         int rc;
3790
3791         acquire_console_sem();
3792         rc = set_get_cmap (arg,0);
3793         release_console_sem();
3794
3795         return rc;
3796 }
3797
3798 void reset_palette(struct vc_data *vc)
3799 {
3800         int j, k;
3801         for (j=k=0; j<16; j++) {
3802                 vc->vc_palette[k++] = default_red[j];
3803                 vc->vc_palette[k++] = default_grn[j];
3804                 vc->vc_palette[k++] = default_blu[j];
3805         }
3806         set_palette(vc);
3807 }
3808
3809 /*
3810  *  Font switching
3811  *
3812  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3813  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 
3814  *  depending on width) reserved for each character which is kinda wasty, but 
3815  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It 
3816  *  is upto the actual low-level console-driver convert data into its favorite
3817  *  format (maybe we should add a `fontoffset' field to the `display'
3818  *  structure so we won't have to convert the fontdata all the time.
3819  *  /Jes
3820  */
3821
3822 #define max_font_size 65536
3823
3824 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3825 {
3826         struct console_font font;
3827         int rc = -EINVAL;
3828         int c;
3829
3830         if (vc->vc_mode != KD_TEXT)
3831                 return -EINVAL;
3832
3833         if (op->data) {
3834                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3835                 if (!font.data)
3836                         return -ENOMEM;
3837         } else
3838                 font.data = NULL;
3839
3840         acquire_console_sem();
3841         if (vc->vc_sw->con_font_get)
3842                 rc = vc->vc_sw->con_font_get(vc, &font);
3843         else
3844                 rc = -ENOSYS;
3845         release_console_sem();
3846
3847         if (rc)
3848                 goto out;
3849
3850         c = (font.width+7)/8 * 32 * font.charcount;
3851
3852         if (op->data && font.charcount > op->charcount)
3853                 rc = -ENOSPC;
3854         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3855                 if (font.width > op->width || font.height > op->height) 
3856                         rc = -ENOSPC;
3857         } else {
3858                 if (font.width != 8)
3859                         rc = -EIO;
3860                 else if ((op->height && font.height > op->height) ||
3861                          font.height > 32)
3862                         rc = -ENOSPC;
3863         }
3864         if (rc)
3865                 goto out;
3866
3867         op->height = font.height;
3868         op->width = font.width;
3869         op->charcount = font.charcount;
3870
3871         if (op->data && copy_to_user(op->data, font.data, c))
3872                 rc = -EFAULT;
3873
3874 out:
3875         kfree(font.data);
3876         return rc;
3877 }
3878
3879 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3880 {
3881         struct console_font font;
3882         int rc = -EINVAL;
3883         int size;
3884
3885         if (vc->vc_mode != KD_TEXT)
3886                 return -EINVAL;
3887         if (!op->data)
3888                 return -EINVAL;
3889         if (op->charcount > 512)
3890                 return -EINVAL;
3891         if (!op->height) {              /* Need to guess font height [compat] */
3892                 int h, i;
3893                 u8 __user *charmap = op->data;
3894                 u8 tmp;
3895                 
3896                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3897                    so that we can get rid of this soon */
3898                 if (!(op->flags & KD_FONT_FLAG_OLD))
3899                         return -EINVAL;
3900                 for (h = 32; h > 0; h--)
3901                         for (i = 0; i < op->charcount; i++) {
3902                                 if (get_user(tmp, &charmap[32*i+h-1]))
3903                                         return -EFAULT;
3904                                 if (tmp)
3905                                         goto nonzero;
3906                         }
3907                 return -EINVAL;
3908         nonzero:
3909                 op->height = h;
3910         }
3911         if (op->width <= 0 || op->width > 32 || op->height > 32)
3912                 return -EINVAL;
3913         size = (op->width+7)/8 * 32 * op->charcount;
3914         if (size > max_font_size)
3915                 return -ENOSPC;
3916         font.charcount = op->charcount;
3917         font.height = op->height;
3918         font.width = op->width;
3919         font.data = kmalloc(size, GFP_KERNEL);
3920         if (!font.data)
3921                 return -ENOMEM;
3922         if (copy_from_user(font.data, op->data, size)) {
3923                 kfree(font.data);
3924                 return -EFAULT;
3925         }
3926         acquire_console_sem();
3927         if (vc->vc_sw->con_font_set)
3928                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3929         else
3930                 rc = -ENOSYS;
3931         release_console_sem();
3932         kfree(font.data);
3933         return rc;
3934 }
3935
3936 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3937 {
3938         struct console_font font = {.width = op->width, .height = op->height};
3939         char name[MAX_FONT_NAME];
3940         char *s = name;
3941         int rc;
3942
3943         if (vc->vc_mode != KD_TEXT)
3944                 return -EINVAL;
3945
3946         if (!op->data)
3947                 s = NULL;
3948         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3949                 return -EFAULT;
3950         else
3951                 name[MAX_FONT_NAME - 1] = 0;
3952
3953         acquire_console_sem();
3954         if (vc->vc_sw->con_font_default)
3955                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3956         else
3957                 rc = -ENOSYS;
3958         release_console_sem();
3959         if (!rc) {
3960                 op->width = font.width;
3961                 op->height = font.height;
3962         }
3963         return rc;
3964 }
3965
3966 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3967 {
3968         int con = op->height;
3969         int rc;
3970
3971         if (vc->vc_mode != KD_TEXT)
3972                 return -EINVAL;
3973
3974         acquire_console_sem();
3975         if (!vc->vc_sw->con_font_copy)
3976                 rc = -ENOSYS;
3977         else if (con < 0 || !vc_cons_allocated(con))
3978                 rc = -ENOTTY;
3979         else if (con == vc->vc_num)     /* nothing to do */
3980                 rc = 0;
3981         else
3982                 rc = vc->vc_sw->con_font_copy(vc, con);
3983         release_console_sem();
3984         return rc;
3985 }
3986
3987 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3988 {
3989         switch (op->op) {
3990         case KD_FONT_OP_SET:
3991                 return con_font_set(vc, op);
3992         case KD_FONT_OP_GET:
3993                 return con_font_get(vc, op);
3994         case KD_FONT_OP_SET_DEFAULT:
3995                 return con_font_default(vc, op);
3996         case KD_FONT_OP_COPY:
3997                 return con_font_copy(vc, op);
3998         }
3999         return -ENOSYS;
4000 }
4001
4002 /*
4003  *      Interface exported to selection and vcs.
4004  */
4005
4006 /* used by selection */
4007 u16 screen_glyph(struct vc_data *vc, int offset)
4008 {
4009         u16 w = scr_readw(screenpos(vc, offset, 1));
4010         u16 c = w & 0xff;
4011
4012         if (w & vc->vc_hi_font_mask)
4013                 c |= 0x100;
4014         return c;
4015 }
4016 EXPORT_SYMBOL_GPL(screen_glyph);
4017
4018 /* used by vcs - note the word offset */
4019 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4020 {
4021         return screenpos(vc, 2 * w_offset, viewed);
4022 }
4023
4024 void getconsxy(struct vc_data *vc, unsigned char *p)
4025 {
4026         p[0] = vc->vc_x;
4027         p[1] = vc->vc_y;
4028 }
4029
4030 void putconsxy(struct vc_data *vc, unsigned char *p)
4031 {
4032         hide_cursor(vc);
4033         gotoxy(vc, p[0], p[1]);
4034         set_cursor(vc);
4035 }
4036
4037 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4038 {
4039         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4040                 return softcursor_original;
4041         return scr_readw(org);
4042 }
4043
4044 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4045 {
4046         scr_writew(val, org);
4047         if ((unsigned long)org == vc->vc_pos) {
4048                 softcursor_original = -1;
4049                 add_softcursor(vc);
4050         }
4051 }
4052
4053 /*
4054  *      Visible symbols for modules
4055  */
4056
4057 EXPORT_SYMBOL(color_table);
4058 EXPORT_SYMBOL(default_red);
4059 EXPORT_SYMBOL(default_grn);
4060 EXPORT_SYMBOL(default_blu);
4061 EXPORT_SYMBOL(update_region);
4062 EXPORT_SYMBOL(redraw_screen);
4063 EXPORT_SYMBOL(vc_resize);
4064 EXPORT_SYMBOL(vc_lock_resize);
4065 EXPORT_SYMBOL(fg_console);
4066 EXPORT_SYMBOL(console_blank_hook);
4067 EXPORT_SYMBOL(console_blanked);
4068 EXPORT_SYMBOL(vc_cons);
4069 #ifndef VT_SINGLE_DRIVER
4070 EXPORT_SYMBOL(take_over_console);
4071 EXPORT_SYMBOL(give_up_console);
4072 #endif