Merge remote-tracking branch 'origin/dev/sumit-linux-3.10.96' into TOT-merge
[linux-3.10.git] / drivers / tty / vt / vt.c
1 /*
2  *  Copyright (C) 1991, 1992  Linus Torvalds
3  */
4
5 /*
6  * Hopefully this will be a rather complete VT102 implementation.
7  *
8  * Beeping thanks to John T Kohl.
9  *
10  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
11  *   Chars, and VT100 enhancements by Peter MacDonald.
12  *
13  * Copy and paste function by Andrew Haylett,
14  *   some enhancements by Alessandro Rubini.
15  *
16  * Code to check for different video-cards mostly by Galen Hunt,
17  * <g-hunt@ee.utah.edu>
18  *
19  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
20  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
21  *
22  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
23  * Resizing of consoles, aeb, 940926
24  *
25  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
26  * <poe@daimi.aau.dk>
27  *
28  * User-defined bell sound, new setterm control sequences and printk
29  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
30  *
31  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
32  *
33  * Merge with the abstract console driver by Geert Uytterhoeven
34  * <geert@linux-m68k.org>, Jan 1997.
35  *
36  *   Original m68k console driver modifications by
37  *
38  *     - Arno Griffioen <arno@usn.nl>
39  *     - David Carter <carter@cs.bris.ac.uk>
40  * 
41  *   The abstract console driver provides a generic interface for a text
42  *   console. It supports VGA text mode, frame buffer based graphical consoles
43  *   and special graphics processors that are only accessible through some
44  *   registers (e.g. a TMS340x0 GSP).
45  *
46  *   The interface to the hardware is specified using a special structure
47  *   (struct consw) which contains function pointers to console operations
48  *   (see <linux/console.h> for more information).
49  *
50  * Support for changeable cursor shape
51  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
52  *
53  * Ported to i386 and con_scrolldelta fixed
54  * by Emmanuel Marty <core@ggi-project.org>, April 1998
55  *
56  * Resurrected character buffers in videoram plus lots of other trickery
57  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
58  *
59  * Removed old-style timers, introduced console_timer, made timer
60  * deletion SMP-safe.  17Jun00, Andrew Morton
61  *
62  * Removed console_lock, enabled interrupts across all console operations
63  * 13 March 2001, Andrew Morton
64  *
65  * Fixed UTF-8 mode so alternate charset modes always work according
66  * to control sequences interpreted in do_con_trol function
67  * preserving backward VT100 semigraphics compatibility,
68  * malformed UTF sequences represented as sequences of replacement glyphs,
69  * original codes or '?' as a last resort if replacement glyph is undefined
70  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
71  */
72
73 #include <linux/module.h>
74 #include <linux/types.h>
75 #include <linux/sched.h>
76 #include <linux/tty.h>
77 #include <linux/tty_flip.h>
78 #include <linux/kernel.h>
79 #include <linux/string.h>
80 #include <linux/errno.h>
81 #include <linux/kd.h>
82 #include <linux/slab.h>
83 #include <linux/major.h>
84 #include <linux/mm.h>
85 #include <linux/console.h>
86 #include <linux/init.h>
87 #include <linux/mutex.h>
88 #include <linux/vt_kern.h>
89 #include <linux/selection.h>
90 #include <linux/tiocl.h>
91 #include <linux/kbd_kern.h>
92 #include <linux/consolemap.h>
93 #include <linux/timer.h>
94 #include <linux/interrupt.h>
95 #include <linux/workqueue.h>
96 #include <linux/pm.h>
97 #include <linux/font.h>
98 #include <linux/bitops.h>
99 #include <linux/notifier.h>
100 #include <linux/device.h>
101 #include <linux/io.h>
102 #include <linux/uaccess.h>
103 #include <linux/kdb.h>
104 #include <linux/ctype.h>
105
106 #define MAX_NR_CON_DRIVER 16
107
108 #define CON_DRIVER_FLAG_MODULE 1
109 #define CON_DRIVER_FLAG_INIT   2
110 #define CON_DRIVER_FLAG_ATTR   4
111
112 struct con_driver {
113         const struct consw *con;
114         const char *desc;
115         struct device *dev;
116         int node;
117         int first;
118         int last;
119         int flag;
120 };
121
122 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
123 const struct consw *conswitchp;
124
125 /* A bitmap for codes <32. A bit of 1 indicates that the code
126  * corresponding to that bit number invokes some special action
127  * (such as cursor movement) and should not be displayed as a
128  * glyph unless the disp_ctrl mode is explicitly enabled.
129  */
130 #define CTRL_ACTION 0x0d00ff81
131 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
132
133 /*
134  * Here is the default bell parameters: 750HZ, 1/8th of a second
135  */
136 #define DEFAULT_BELL_PITCH      750
137 #define DEFAULT_BELL_DURATION   (HZ/8)
138
139 struct vc vc_cons [MAX_NR_CONSOLES];
140
141 #ifndef VT_SINGLE_DRIVER
142 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
143 #endif
144
145 static int con_open(struct tty_struct *, struct file *);
146 static void vc_init(struct vc_data *vc, unsigned int rows,
147                     unsigned int cols, int do_clear);
148 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
149 static void save_cur(struct vc_data *vc);
150 static void reset_terminal(struct vc_data *vc, int do_clear);
151 static void con_flush_chars(struct tty_struct *tty);
152 static int set_vesa_blanking(char __user *p);
153 static void set_cursor(struct vc_data *vc);
154 static void hide_cursor(struct vc_data *vc);
155 static void console_callback(struct work_struct *ignored);
156 static void blank_screen_t(unsigned long dummy);
157 static void set_palette(struct vc_data *vc);
158
159 static int printable;           /* Is console ready for printing? */
160 int default_utf8 = true;
161 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
162 int global_cursor_default = -1;
163 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
164
165 static int cur_default = CUR_DEFAULT;
166 module_param(cur_default, int, S_IRUGO | S_IWUSR);
167
168 /*
169  * ignore_poke: don't unblank the screen when things are typed.  This is
170  * mainly for the privacy of braille terminal users.
171  */
172 static int ignore_poke;
173
174 int do_poke_blanked_console;
175 int console_blanked = 1;        /* console is blank initially */
176
177 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
178 static int vesa_off_interval;
179 static int blankinterval = 10*60;
180 core_param(consoleblank, blankinterval, int, 0444);
181
182 static DECLARE_WORK(console_work, console_callback);
183
184 /*
185  * fg_console is the current virtual console,
186  * last_console is the last used one,
187  * want_console is the console we want to switch to,
188  * saved_* variants are for save/restore around kernel debugger enter/leave
189  */
190 int fg_console;
191 int last_console;
192 int want_console = -1;
193 static int saved_fg_console;
194 static int saved_last_console;
195 static int saved_want_console;
196 static int saved_vc_mode;
197 static int saved_console_blanked;
198
199 /*
200  * For each existing display, we have a pointer to console currently visible
201  * on that display, allowing consoles other than fg_console to be refreshed
202  * appropriately. Unless the low-level driver supplies its own display_fg
203  * variable, we use this one for the "master display".
204  */
205 static struct vc_data *master_display_fg;
206
207 /*
208  * Unfortunately, we need to delay tty echo when we're currently writing to the
209  * console since the code is (and always was) not re-entrant, so we schedule
210  * all flip requests to process context with schedule-task() and run it from
211  * console_callback().
212  */
213
214 /*
215  * For the same reason, we defer scrollback to the console callback.
216  */
217 static int scrollback_delta;
218
219 /*
220  * Hook so that the power management routines can (un)blank
221  * the console on our behalf.
222  */
223 int (*console_blank_hook)(int);
224
225 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
226 static int blank_state;
227 static int blank_timer_expired;
228 enum {
229         blank_off = 0,
230         blank_normal_wait,
231         blank_vesa_wait,
232 };
233
234 /*
235  * /sys/class/tty/tty0/
236  *
237  * the attribute 'active' contains the name of the current vc
238  * console and it supports poll() to detect vc switches
239  */
240 static struct device *tty0dev;
241
242 /*
243  * Notifier list for console events.
244  */
245 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
246
247 int register_vt_notifier(struct notifier_block *nb)
248 {
249         return atomic_notifier_chain_register(&vt_notifier_list, nb);
250 }
251 EXPORT_SYMBOL_GPL(register_vt_notifier);
252
253 int unregister_vt_notifier(struct notifier_block *nb)
254 {
255         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
256 }
257 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
258
259 static void notify_write(struct vc_data *vc, unsigned int unicode)
260 {
261         struct vt_notifier_param param = { .vc = vc, .c = unicode };
262         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
263 }
264
265 static void notify_update(struct vc_data *vc)
266 {
267         struct vt_notifier_param param = { .vc = vc };
268         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
269 }
270 /*
271  *      Low-Level Functions
272  */
273
274 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
275
276 #ifdef VT_BUF_VRAM_ONLY
277 #define DO_UPDATE(vc)   0
278 #else
279 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
280 #endif
281
282 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
283 {
284         unsigned short *p;
285         
286         if (!viewed)
287                 p = (unsigned short *)(vc->vc_origin + offset);
288         else if (!vc->vc_sw->con_screen_pos)
289                 p = (unsigned short *)(vc->vc_visible_origin + offset);
290         else
291                 p = vc->vc_sw->con_screen_pos(vc, offset);
292         return p;
293 }
294
295 /* Called  from the keyboard irq path.. */
296 static inline void scrolldelta(int lines)
297 {
298         /* FIXME */
299         /* scrolldelta needs some kind of consistency lock, but the BKL was
300            and still is not protecting versus the scheduled back end */
301         scrollback_delta += lines;
302         schedule_console_callback();
303 }
304
305 void schedule_console_callback(void)
306 {
307         schedule_work(&console_work);
308 }
309
310 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
311 {
312         unsigned short *d, *s;
313
314         if (t+nr >= b)
315                 nr = b - t - 1;
316         if (b > vc->vc_rows || t >= b || nr < 1)
317                 return;
318         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
319                 return;
320         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
321         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
322         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
323         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
324                     vc->vc_size_row * nr);
325 }
326
327 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
328 {
329         unsigned short *s;
330         unsigned int step;
331
332         if (t+nr >= b)
333                 nr = b - t - 1;
334         if (b > vc->vc_rows || t >= b || nr < 1)
335                 return;
336         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
337                 return;
338         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
339         step = vc->vc_cols * nr;
340         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
341         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
342 }
343
344 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
345 {
346 #ifndef VT_BUF_VRAM_ONLY
347         unsigned int xx, yy, offset;
348         u16 *p;
349
350         p = (u16 *) start;
351         if (!vc->vc_sw->con_getxy) {
352                 offset = (start - vc->vc_origin) / 2;
353                 xx = offset % vc->vc_cols;
354                 yy = offset / vc->vc_cols;
355         } else {
356                 int nxx, nyy;
357                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
358                 xx = nxx; yy = nyy;
359         }
360         for(;;) {
361                 u16 attrib = scr_readw(p) & 0xff00;
362                 int startx = xx;
363                 u16 *q = p;
364                 while (xx < vc->vc_cols && count) {
365                         if (attrib != (scr_readw(p) & 0xff00)) {
366                                 if (p > q)
367                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
368                                 startx = xx;
369                                 q = p;
370                                 attrib = scr_readw(p) & 0xff00;
371                         }
372                         p++;
373                         xx++;
374                         count--;
375                 }
376                 if (p > q)
377                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
378                 if (!count)
379                         break;
380                 xx = 0;
381                 yy++;
382                 if (vc->vc_sw->con_getxy) {
383                         p = (u16 *)start;
384                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
385                 }
386         }
387 #endif
388 }
389
390 void update_region(struct vc_data *vc, unsigned long start, int count)
391 {
392         WARN_CONSOLE_UNLOCKED();
393
394         if (DO_UPDATE(vc)) {
395                 hide_cursor(vc);
396                 do_update_region(vc, start, count);
397                 set_cursor(vc);
398         }
399 }
400
401 /* Structure of attributes is hardware-dependent */
402
403 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
404     u8 _underline, u8 _reverse, u8 _italic)
405 {
406         if (vc->vc_sw->con_build_attr)
407                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
408                        _blink, _underline, _reverse, _italic);
409
410 #ifndef VT_BUF_VRAM_ONLY
411 /*
412  * ++roman: I completely changed the attribute format for monochrome
413  * mode (!can_do_color). The formerly used MDA (monochrome display
414  * adapter) format didn't allow the combination of certain effects.
415  * Now the attribute is just a bit vector:
416  *  Bit 0..1: intensity (0..2)
417  *  Bit 2   : underline
418  *  Bit 3   : reverse
419  *  Bit 7   : blink
420  */
421         {
422         u8 a = _color;
423         if (!vc->vc_can_do_color)
424                 return _intensity |
425                        (_italic ? 2 : 0) |
426                        (_underline ? 4 : 0) |
427                        (_reverse ? 8 : 0) |
428                        (_blink ? 0x80 : 0);
429         if (_italic)
430                 a = (a & 0xF0) | vc->vc_itcolor;
431         else if (_underline)
432                 a = (a & 0xf0) | vc->vc_ulcolor;
433         else if (_intensity == 0)
434                 a = (a & 0xf0) | vc->vc_ulcolor;
435         if (_reverse)
436                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
437         if (_blink)
438                 a ^= 0x80;
439         if (_intensity == 2)
440                 a ^= 0x08;
441         if (vc->vc_hi_font_mask == 0x100)
442                 a <<= 1;
443         return a;
444         }
445 #else
446         return 0;
447 #endif
448 }
449
450 static void update_attr(struct vc_data *vc)
451 {
452         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
453                       vc->vc_blink, vc->vc_underline,
454                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
455         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
456 }
457
458 /* Note: inverting the screen twice should revert to the original state */
459 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
460 {
461         unsigned short *p;
462
463         WARN_CONSOLE_UNLOCKED();
464
465         count /= 2;
466         p = screenpos(vc, offset, viewed);
467         if (vc->vc_sw->con_invert_region)
468                 vc->vc_sw->con_invert_region(vc, p, count);
469 #ifndef VT_BUF_VRAM_ONLY
470         else {
471                 u16 *q = p;
472                 int cnt = count;
473                 u16 a;
474
475                 if (!vc->vc_can_do_color) {
476                         while (cnt--) {
477                             a = scr_readw(q);
478                             a ^= 0x0800;
479                             scr_writew(a, q);
480                             q++;
481                         }
482                 } else if (vc->vc_hi_font_mask == 0x100) {
483                         while (cnt--) {
484                                 a = scr_readw(q);
485                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
486                                 scr_writew(a, q);
487                                 q++;
488                         }
489                 } else {
490                         while (cnt--) {
491                                 a = scr_readw(q);
492                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
493                                 scr_writew(a, q);
494                                 q++;
495                         }
496                 }
497         }
498 #endif
499         if (DO_UPDATE(vc))
500                 do_update_region(vc, (unsigned long) p, count);
501         notify_update(vc);
502 }
503
504 /* used by selection: complement pointer position */
505 void complement_pos(struct vc_data *vc, int offset)
506 {
507         static int old_offset = -1;
508         static unsigned short old;
509         static unsigned short oldx, oldy;
510
511         WARN_CONSOLE_UNLOCKED();
512
513         if (old_offset != -1 && old_offset >= 0 &&
514             old_offset < vc->vc_screenbuf_size) {
515                 scr_writew(old, screenpos(vc, old_offset, 1));
516                 if (DO_UPDATE(vc))
517                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
518                 notify_update(vc);
519         }
520
521         old_offset = offset;
522
523         if (offset != -1 && offset >= 0 &&
524             offset < vc->vc_screenbuf_size) {
525                 unsigned short new;
526                 unsigned short *p;
527                 p = screenpos(vc, offset, 1);
528                 old = scr_readw(p);
529                 new = old ^ vc->vc_complement_mask;
530                 scr_writew(new, p);
531                 if (DO_UPDATE(vc)) {
532                         oldx = (offset >> 1) % vc->vc_cols;
533                         oldy = (offset >> 1) / vc->vc_cols;
534                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
535                 }
536                 notify_update(vc);
537         }
538 }
539
540 static void insert_char(struct vc_data *vc, unsigned int nr)
541 {
542         unsigned short *p = (unsigned short *) vc->vc_pos;
543
544         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
545         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
546         vc->vc_need_wrap = 0;
547         if (DO_UPDATE(vc))
548                 do_update_region(vc, (unsigned long) p,
549                         vc->vc_cols - vc->vc_x);
550 }
551
552 static void delete_char(struct vc_data *vc, unsigned int nr)
553 {
554         unsigned short *p = (unsigned short *) vc->vc_pos;
555
556         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
557         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
558                         nr * 2);
559         vc->vc_need_wrap = 0;
560         if (DO_UPDATE(vc))
561                 do_update_region(vc, (unsigned long) p,
562                         vc->vc_cols - vc->vc_x);
563 }
564
565 static int softcursor_original;
566
567 static void add_softcursor(struct vc_data *vc)
568 {
569         int i = scr_readw((u16 *) vc->vc_pos);
570         u32 type = vc->vc_cursor_type;
571
572         if (! (type & 0x10)) return;
573         if (softcursor_original != -1) return;
574         softcursor_original = i;
575         i |= ((type >> 8) & 0xff00 );
576         i ^= ((type) & 0xff00 );
577         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
578         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
579         scr_writew(i, (u16 *) vc->vc_pos);
580         if (DO_UPDATE(vc))
581                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
582 }
583
584 static void hide_softcursor(struct vc_data *vc)
585 {
586         if (softcursor_original != -1) {
587                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
588                 if (DO_UPDATE(vc))
589                         vc->vc_sw->con_putc(vc, softcursor_original,
590                                         vc->vc_y, vc->vc_x);
591                 softcursor_original = -1;
592         }
593 }
594
595 static void hide_cursor(struct vc_data *vc)
596 {
597         if (vc == sel_cons)
598                 clear_selection();
599         vc->vc_sw->con_cursor(vc, CM_ERASE);
600         hide_softcursor(vc);
601 }
602
603 static void set_cursor(struct vc_data *vc)
604 {
605         if (!IS_FG(vc) || console_blanked ||
606             vc->vc_mode == KD_GRAPHICS)
607                 return;
608         if (vc->vc_deccm) {
609                 if (vc == sel_cons)
610                         clear_selection();
611                 add_softcursor(vc);
612                 if ((vc->vc_cursor_type & 0x0f) != 1)
613                         vc->vc_sw->con_cursor(vc, CM_DRAW);
614         } else
615                 hide_cursor(vc);
616 }
617
618 static void set_origin(struct vc_data *vc)
619 {
620         WARN_CONSOLE_UNLOCKED();
621
622         if (!CON_IS_VISIBLE(vc) ||
623             !vc->vc_sw->con_set_origin ||
624             !vc->vc_sw->con_set_origin(vc))
625                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
626         vc->vc_visible_origin = vc->vc_origin;
627         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
628         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
629 }
630
631 static inline void save_screen(struct vc_data *vc)
632 {
633         WARN_CONSOLE_UNLOCKED();
634
635         if (vc->vc_sw->con_save_screen)
636                 vc->vc_sw->con_save_screen(vc);
637 }
638
639 /*
640  *      Redrawing of screen
641  */
642
643 void clear_buffer_attributes(struct vc_data *vc)
644 {
645         unsigned short *p = (unsigned short *)vc->vc_origin;
646         int count = vc->vc_screenbuf_size / 2;
647         int mask = vc->vc_hi_font_mask | 0xff;
648
649         for (; count > 0; count--, p++) {
650                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
651         }
652 }
653
654 void redraw_screen(struct vc_data *vc, int is_switch)
655 {
656         int redraw = 0;
657
658         WARN_CONSOLE_UNLOCKED();
659
660         if (!vc) {
661                 /* strange ... */
662                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
663                 return;
664         }
665
666         if (is_switch) {
667                 struct vc_data *old_vc = vc_cons[fg_console].d;
668                 if (old_vc == vc)
669                         return;
670                 if (!CON_IS_VISIBLE(vc))
671                         redraw = 1;
672                 *vc->vc_display_fg = vc;
673                 fg_console = vc->vc_num;
674                 hide_cursor(old_vc);
675                 if (!CON_IS_VISIBLE(old_vc)) {
676                         save_screen(old_vc);
677                         set_origin(old_vc);
678                 }
679                 if (tty0dev)
680                         sysfs_notify(&tty0dev->kobj, NULL, "active");
681         } else {
682                 hide_cursor(vc);
683                 redraw = 1;
684         }
685
686         if (redraw) {
687                 int update;
688                 int old_was_color = vc->vc_can_do_color;
689
690                 set_origin(vc);
691                 update = vc->vc_sw->con_switch(vc);
692                 set_palette(vc);
693                 /*
694                  * If console changed from mono<->color, the best we can do
695                  * is to clear the buffer attributes. As it currently stands,
696                  * rebuilding new attributes from the old buffer is not doable
697                  * without overly complex code.
698                  */
699                 if (old_was_color != vc->vc_can_do_color) {
700                         update_attr(vc);
701                         clear_buffer_attributes(vc);
702                 }
703
704                 /* Forcibly update if we're panicing */
705                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
706                     vt_force_oops_output(vc))
707                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
708         }
709         set_cursor(vc);
710         if (is_switch) {
711                 set_leds();
712                 compute_shiftstate();
713                 notify_update(vc);
714         }
715 }
716
717 /*
718  *      Allocation, freeing and resizing of VTs.
719  */
720
721 int vc_cons_allocated(unsigned int i)
722 {
723         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
724 }
725
726 static void visual_init(struct vc_data *vc, int num, int init)
727 {
728         /* ++Geert: vc->vc_sw->con_init determines console size */
729         if (vc->vc_sw)
730                 module_put(vc->vc_sw->owner);
731         vc->vc_sw = conswitchp;
732 #ifndef VT_SINGLE_DRIVER
733         if (con_driver_map[num])
734                 vc->vc_sw = con_driver_map[num];
735 #endif
736         __module_get(vc->vc_sw->owner);
737         vc->vc_num = num;
738         vc->vc_display_fg = &master_display_fg;
739         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
740         vc->vc_uni_pagedir = 0;
741         vc->vc_hi_font_mask = 0;
742         vc->vc_complement_mask = 0;
743         vc->vc_can_do_color = 0;
744         vc->vc_panic_force_write = false;
745         vc->vc_sw->con_init(vc, init);
746         if (!vc->vc_complement_mask)
747                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
748         vc->vc_s_complement_mask = vc->vc_complement_mask;
749         vc->vc_size_row = vc->vc_cols << 1;
750         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
751 }
752
753 int vc_allocate(unsigned int currcons)  /* return 0 on success */
754 {
755         WARN_CONSOLE_UNLOCKED();
756
757         if (currcons >= MAX_NR_CONSOLES)
758                 return -ENXIO;
759         if (!vc_cons[currcons].d) {
760             struct vc_data *vc;
761             struct vt_notifier_param param;
762
763             /* prevent users from taking too much memory */
764             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
765               return -EPERM;
766
767             /* due to the granularity of kmalloc, we waste some memory here */
768             /* the alloc is done in two steps, to optimize the common situation
769                of a 25x80 console (structsize=216, screenbuf_size=4000) */
770             /* although the numbers above are not valid since long ago, the
771                point is still up-to-date and the comment still has its value
772                even if only as a historical artifact.  --mj, July 1998 */
773             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
774             if (!vc)
775                 return -ENOMEM;
776             vc_cons[currcons].d = vc;
777             tty_port_init(&vc->port);
778             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
779             visual_init(vc, currcons, 1);
780             if (!*vc->vc_uni_pagedir_loc)
781                 con_set_default_unimap(vc);
782             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
783             if (!vc->vc_screenbuf) {
784                 kfree(vc);
785                 vc_cons[currcons].d = NULL;
786                 return -ENOMEM;
787             }
788
789             /* If no drivers have overridden us and the user didn't pass a
790                boot option, default to displaying the cursor */
791             if (global_cursor_default == -1)
792                     global_cursor_default = 1;
793
794             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
795             vcs_make_sysfs(currcons);
796             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
797         }
798         return 0;
799 }
800
801 static inline int resize_screen(struct vc_data *vc, int width, int height,
802                                 int user)
803 {
804         /* Resizes the resolution of the display adapater */
805         int err = 0;
806
807         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
808                 err = vc->vc_sw->con_resize(vc, width, height, user);
809
810         return err;
811 }
812
813 /*
814  * Change # of rows and columns (0 means unchanged/the size of fg_console)
815  * [this is to be used together with some user program
816  * like resize that changes the hardware videomode]
817  */
818 #define VC_RESIZE_MAXCOL (32767)
819 #define VC_RESIZE_MAXROW (32767)
820
821 /**
822  *      vc_do_resize    -       resizing method for the tty
823  *      @tty: tty being resized
824  *      @real_tty: real tty (different to tty if a pty/tty pair)
825  *      @vc: virtual console private data
826  *      @cols: columns
827  *      @lines: lines
828  *
829  *      Resize a virtual console, clipping according to the actual constraints.
830  *      If the caller passes a tty structure then update the termios winsize
831  *      information and perform any necessary signal handling.
832  *
833  *      Caller must hold the console semaphore. Takes the termios mutex and
834  *      ctrl_lock of the tty IFF a tty is passed.
835  */
836
837 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
838                                 unsigned int cols, unsigned int lines)
839 {
840         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
841         unsigned long end;
842         unsigned int old_rows, old_row_size;
843         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
844         unsigned int user;
845         unsigned short *newscreen;
846
847         WARN_CONSOLE_UNLOCKED();
848
849         if (!vc)
850                 return -ENXIO;
851
852         user = vc->vc_resize_user;
853         vc->vc_resize_user = 0;
854
855         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
856                 return -EINVAL;
857
858         new_cols = (cols ? cols : vc->vc_cols);
859         new_rows = (lines ? lines : vc->vc_rows);
860         new_row_size = new_cols << 1;
861         new_screen_size = new_row_size * new_rows;
862
863         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
864                 return 0;
865
866         newscreen = kmalloc(new_screen_size, GFP_USER);
867         if (!newscreen)
868                 return -ENOMEM;
869
870         old_rows = vc->vc_rows;
871         old_row_size = vc->vc_size_row;
872
873         err = resize_screen(vc, new_cols, new_rows, user);
874         if (err) {
875                 kfree(newscreen);
876                 return err;
877         }
878
879         vc->vc_rows = new_rows;
880         vc->vc_cols = new_cols;
881         vc->vc_size_row = new_row_size;
882         vc->vc_screenbuf_size = new_screen_size;
883
884         rlth = min(old_row_size, new_row_size);
885         rrem = new_row_size - rlth;
886         old_origin = vc->vc_origin;
887         new_origin = (long) newscreen;
888         new_scr_end = new_origin + new_screen_size;
889
890         if (vc->vc_y > new_rows) {
891                 if (old_rows - vc->vc_y < new_rows) {
892                         /*
893                          * Cursor near the bottom, copy contents from the
894                          * bottom of buffer
895                          */
896                         old_origin += (old_rows - new_rows) * old_row_size;
897                 } else {
898                         /*
899                          * Cursor is in no man's land, copy 1/2 screenful
900                          * from the top and bottom of cursor position
901                          */
902                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
903                 }
904         }
905
906         end = old_origin + old_row_size * min(old_rows, new_rows);
907
908         update_attr(vc);
909
910         while (old_origin < end) {
911                 scr_memcpyw((unsigned short *) new_origin,
912                             (unsigned short *) old_origin, rlth);
913                 if (rrem)
914                         scr_memsetw((void *)(new_origin + rlth),
915                                     vc->vc_video_erase_char, rrem);
916                 old_origin += old_row_size;
917                 new_origin += new_row_size;
918         }
919         if (new_scr_end > new_origin)
920                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
921                             new_scr_end - new_origin);
922         kfree(vc->vc_screenbuf);
923         vc->vc_screenbuf = newscreen;
924         vc->vc_screenbuf_size = new_screen_size;
925         set_origin(vc);
926
927         /* do part of a reset_terminal() */
928         vc->vc_top = 0;
929         vc->vc_bottom = vc->vc_rows;
930         gotoxy(vc, vc->vc_x, vc->vc_y);
931         save_cur(vc);
932
933         if (tty) {
934                 /* Rewrite the requested winsize data with the actual
935                    resulting sizes */
936                 struct winsize ws;
937                 memset(&ws, 0, sizeof(ws));
938                 ws.ws_row = vc->vc_rows;
939                 ws.ws_col = vc->vc_cols;
940                 ws.ws_ypixel = vc->vc_scan_lines;
941                 tty_do_resize(tty, &ws);
942         }
943
944         if (CON_IS_VISIBLE(vc))
945                 update_screen(vc);
946         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
947         return err;
948 }
949
950 /**
951  *      vc_resize               -       resize a VT
952  *      @vc: virtual console
953  *      @cols: columns
954  *      @rows: rows
955  *
956  *      Resize a virtual console as seen from the console end of things. We
957  *      use the common vc_do_resize methods to update the structures. The
958  *      caller must hold the console sem to protect console internals and
959  *      vc->port.tty
960  */
961
962 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
963 {
964         return vc_do_resize(vc->port.tty, vc, cols, rows);
965 }
966
967 /**
968  *      vt_resize               -       resize a VT
969  *      @tty: tty to resize
970  *      @ws: winsize attributes
971  *
972  *      Resize a virtual terminal. This is called by the tty layer as we
973  *      register our own handler for resizing. The mutual helper does all
974  *      the actual work.
975  *
976  *      Takes the console sem and the called methods then take the tty
977  *      termios_mutex and the tty ctrl_lock in that order.
978  */
979 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
980 {
981         struct vc_data *vc = tty->driver_data;
982         int ret;
983
984         console_lock();
985         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
986         console_unlock();
987         return ret;
988 }
989
990 struct vc_data *vc_deallocate(unsigned int currcons)
991 {
992         struct vc_data *vc = NULL;
993
994         WARN_CONSOLE_UNLOCKED();
995
996         if (vc_cons_allocated(currcons)) {
997                 struct vt_notifier_param param;
998
999                 param.vc = vc = vc_cons[currcons].d;
1000                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1001                 vcs_remove_sysfs(currcons);
1002                 vc->vc_sw->con_deinit(vc);
1003                 put_pid(vc->vt_pid);
1004                 module_put(vc->vc_sw->owner);
1005                 kfree(vc->vc_screenbuf);
1006                 vc_cons[currcons].d = NULL;
1007         }
1008         return vc;
1009 }
1010
1011 /*
1012  *      VT102 emulator
1013  */
1014
1015 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1016 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1017 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1018
1019 #define decarm          VC_REPEAT
1020 #define decckm          VC_CKMODE
1021 #define kbdapplic       VC_APPLIC
1022 #define lnm             VC_CRLF
1023
1024 /*
1025  * this is what the terminal answers to a ESC-Z or csi0c query.
1026  */
1027 #define VT100ID "\033[?1;2c"
1028 #define VT102ID "\033[?6c"
1029
1030 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1031                                        8,12,10,14, 9,13,11,15 };
1032
1033 /* the default colour table, for VGA+ colour systems */
1034 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1035     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1036 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1037     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1038 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1039     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1040
1041 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1042 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1043 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1044
1045 /*
1046  * gotoxy() must verify all boundaries, because the arguments
1047  * might also be negative. If the given position is out of
1048  * bounds, the cursor is placed at the nearest margin.
1049  */
1050 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1051 {
1052         int min_y, max_y;
1053
1054         if (new_x < 0)
1055                 vc->vc_x = 0;
1056         else {
1057                 if (new_x >= vc->vc_cols)
1058                         vc->vc_x = vc->vc_cols - 1;
1059                 else
1060                         vc->vc_x = new_x;
1061         }
1062
1063         if (vc->vc_decom) {
1064                 min_y = vc->vc_top;
1065                 max_y = vc->vc_bottom;
1066         } else {
1067                 min_y = 0;
1068                 max_y = vc->vc_rows;
1069         }
1070         if (new_y < min_y)
1071                 vc->vc_y = min_y;
1072         else if (new_y >= max_y)
1073                 vc->vc_y = max_y - 1;
1074         else
1075                 vc->vc_y = new_y;
1076         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1077         vc->vc_need_wrap = 0;
1078 }
1079
1080 /* for absolute user moves, when decom is set */
1081 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1082 {
1083         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1084 }
1085
1086 void scrollback(struct vc_data *vc, int lines)
1087 {
1088         if (!lines)
1089                 lines = vc->vc_rows / 2;
1090         scrolldelta(-lines);
1091 }
1092
1093 void scrollfront(struct vc_data *vc, int lines)
1094 {
1095         if (!lines)
1096                 lines = vc->vc_rows / 2;
1097         scrolldelta(lines);
1098 }
1099
1100 static void lf(struct vc_data *vc)
1101 {
1102         /* don't scroll if above bottom of scrolling region, or
1103          * if below scrolling region
1104          */
1105         if (vc->vc_y + 1 == vc->vc_bottom)
1106                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1107         else if (vc->vc_y < vc->vc_rows - 1) {
1108                 vc->vc_y++;
1109                 vc->vc_pos += vc->vc_size_row;
1110         }
1111         vc->vc_need_wrap = 0;
1112         notify_write(vc, '\n');
1113 }
1114
1115 static void ri(struct vc_data *vc)
1116 {
1117         /* don't scroll if below top of scrolling region, or
1118          * if above scrolling region
1119          */
1120         if (vc->vc_y == vc->vc_top)
1121                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1122         else if (vc->vc_y > 0) {
1123                 vc->vc_y--;
1124                 vc->vc_pos -= vc->vc_size_row;
1125         }
1126         vc->vc_need_wrap = 0;
1127 }
1128
1129 static inline void cr(struct vc_data *vc)
1130 {
1131         vc->vc_pos -= vc->vc_x << 1;
1132         vc->vc_need_wrap = vc->vc_x = 0;
1133         notify_write(vc, '\r');
1134 }
1135
1136 static inline void bs(struct vc_data *vc)
1137 {
1138         if (vc->vc_x) {
1139                 vc->vc_pos -= 2;
1140                 vc->vc_x--;
1141                 vc->vc_need_wrap = 0;
1142                 notify_write(vc, '\b');
1143         }
1144 }
1145
1146 static inline void del(struct vc_data *vc)
1147 {
1148         /* ignored */
1149 }
1150
1151 static void csi_J(struct vc_data *vc, int vpar)
1152 {
1153         unsigned int count;
1154         unsigned short * start;
1155
1156         switch (vpar) {
1157                 case 0: /* erase from cursor to end of display */
1158                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1159                         start = (unsigned short *)vc->vc_pos;
1160                         break;
1161                 case 1: /* erase from start to cursor */
1162                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1163                         start = (unsigned short *)vc->vc_origin;
1164                         break;
1165                 case 3: /* erase scroll-back buffer (and whole display) */
1166                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1167                                     vc->vc_screenbuf_size >> 1);
1168                         set_origin(vc);
1169                         if (CON_IS_VISIBLE(vc))
1170                                 update_screen(vc);
1171                         /* fall through */
1172                 case 2: /* erase whole display */
1173                         count = vc->vc_cols * vc->vc_rows;
1174                         start = (unsigned short *)vc->vc_origin;
1175                         break;
1176                 default:
1177                         return;
1178         }
1179         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1180         if (DO_UPDATE(vc))
1181                 do_update_region(vc, (unsigned long) start, count);
1182         vc->vc_need_wrap = 0;
1183 }
1184
1185 static void csi_K(struct vc_data *vc, int vpar)
1186 {
1187         unsigned int count;
1188         unsigned short * start;
1189
1190         switch (vpar) {
1191                 case 0: /* erase from cursor to end of line */
1192                         count = vc->vc_cols - vc->vc_x;
1193                         start = (unsigned short *)vc->vc_pos;
1194                         break;
1195                 case 1: /* erase from start of line to cursor */
1196                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1197                         count = vc->vc_x + 1;
1198                         break;
1199                 case 2: /* erase whole line */
1200                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1201                         count = vc->vc_cols;
1202                         break;
1203                 default:
1204                         return;
1205         }
1206         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1207         vc->vc_need_wrap = 0;
1208         if (DO_UPDATE(vc))
1209                 do_update_region(vc, (unsigned long) start, count);
1210 }
1211
1212 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1213 {                                         /* not vt100? */
1214         int count;
1215
1216         if (!vpar)
1217                 vpar++;
1218         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1219
1220         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1221         if (DO_UPDATE(vc))
1222                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1223         vc->vc_need_wrap = 0;
1224 }
1225
1226 static void default_attr(struct vc_data *vc)
1227 {
1228         vc->vc_intensity = 1;
1229         vc->vc_italic = 0;
1230         vc->vc_underline = 0;
1231         vc->vc_reverse = 0;
1232         vc->vc_blink = 0;
1233         vc->vc_color = vc->vc_def_color;
1234 }
1235
1236 /* console_lock is held */
1237 static void csi_m(struct vc_data *vc)
1238 {
1239         int i;
1240
1241         for (i = 0; i <= vc->vc_npar; i++)
1242                 switch (vc->vc_par[i]) {
1243                         case 0: /* all attributes off */
1244                                 default_attr(vc);
1245                                 break;
1246                         case 1:
1247                                 vc->vc_intensity = 2;
1248                                 break;
1249                         case 2:
1250                                 vc->vc_intensity = 0;
1251                                 break;
1252                         case 3:
1253                                 vc->vc_italic = 1;
1254                                 break;
1255                         case 4:
1256                                 vc->vc_underline = 1;
1257                                 break;
1258                         case 5:
1259                                 vc->vc_blink = 1;
1260                                 break;
1261                         case 7:
1262                                 vc->vc_reverse = 1;
1263                                 break;
1264                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1265                                   * Select primary font, don't display
1266                                   * control chars if defined, don't set
1267                                   * bit 8 on output.
1268                                   */
1269                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1270                                                 ? vc->vc_G0_charset
1271                                                 : vc->vc_G1_charset, vc);
1272                                 vc->vc_disp_ctrl = 0;
1273                                 vc->vc_toggle_meta = 0;
1274                                 break;
1275                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1276                                   * Select first alternate font, lets
1277                                   * chars < 32 be displayed as ROM chars.
1278                                   */
1279                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1280                                 vc->vc_disp_ctrl = 1;
1281                                 vc->vc_toggle_meta = 0;
1282                                 break;
1283                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1284                                   * Select second alternate font, toggle
1285                                   * high bit before displaying as ROM char.
1286                                   */
1287                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1288                                 vc->vc_disp_ctrl = 1;
1289                                 vc->vc_toggle_meta = 1;
1290                                 break;
1291                         case 21:
1292                         case 22:
1293                                 vc->vc_intensity = 1;
1294                                 break;
1295                         case 23:
1296                                 vc->vc_italic = 0;
1297                                 break;
1298                         case 24:
1299                                 vc->vc_underline = 0;
1300                                 break;
1301                         case 25:
1302                                 vc->vc_blink = 0;
1303                                 break;
1304                         case 27:
1305                                 vc->vc_reverse = 0;
1306                                 break;
1307                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1308                                   * Enables underscore, white foreground
1309                                   * with white underscore (Linux - use
1310                                   * default foreground).
1311                                   */
1312                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1313                                 vc->vc_underline = 1;
1314                                 break;
1315                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1316                                   * Disable underline option.
1317                                   * Reset colour to default? It did this
1318                                   * before...
1319                                   */
1320                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1321                                 vc->vc_underline = 0;
1322                                 break;
1323                         case 49:
1324                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1325                                 break;
1326                         default:
1327                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1328                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1329                                                 | (vc->vc_color & 0xf0);
1330                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1331                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1332                                                 | (vc->vc_color & 0x0f);
1333                                 break;
1334                 }
1335         update_attr(vc);
1336 }
1337
1338 static void respond_string(const char *p, struct tty_port *port)
1339 {
1340         while (*p) {
1341                 tty_insert_flip_char(port, *p, 0);
1342                 p++;
1343         }
1344         tty_schedule_flip(port);
1345 }
1346
1347 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1348 {
1349         char buf[40];
1350
1351         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1352         respond_string(buf, tty->port);
1353 }
1354
1355 static inline void status_report(struct tty_struct *tty)
1356 {
1357         respond_string("\033[0n", tty->port);   /* Terminal ok */
1358 }
1359
1360 static inline void respond_ID(struct tty_struct *tty)
1361 {
1362         respond_string(VT102ID, tty->port);
1363 }
1364
1365 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1366 {
1367         char buf[8];
1368
1369         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1370                 (char)('!' + mry));
1371         respond_string(buf, tty->port);
1372 }
1373
1374 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1375 int mouse_reporting(void)
1376 {
1377         return vc_cons[fg_console].d->vc_report_mouse;
1378 }
1379
1380 /* console_lock is held */
1381 static void set_mode(struct vc_data *vc, int on_off)
1382 {
1383         int i;
1384
1385         for (i = 0; i <= vc->vc_npar; i++)
1386                 if (vc->vc_ques) {
1387                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1388                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1389                                 if (on_off)
1390                                         set_kbd(vc, decckm);
1391                                 else
1392                                         clr_kbd(vc, decckm);
1393                                 break;
1394                         case 3: /* 80/132 mode switch unimplemented */
1395                                 vc->vc_deccolm = on_off;
1396 #if 0
1397                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1398                                 /* this alone does not suffice; some user mode
1399                                    utility has to change the hardware regs */
1400 #endif
1401                                 break;
1402                         case 5:                 /* Inverted screen on/off */
1403                                 if (vc->vc_decscnm != on_off) {
1404                                         vc->vc_decscnm = on_off;
1405                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1406                                         update_attr(vc);
1407                                 }
1408                                 break;
1409                         case 6:                 /* Origin relative/absolute */
1410                                 vc->vc_decom = on_off;
1411                                 gotoxay(vc, 0, 0);
1412                                 break;
1413                         case 7:                 /* Autowrap on/off */
1414                                 vc->vc_decawm = on_off;
1415                                 break;
1416                         case 8:                 /* Autorepeat on/off */
1417                                 if (on_off)
1418                                         set_kbd(vc, decarm);
1419                                 else
1420                                         clr_kbd(vc, decarm);
1421                                 break;
1422                         case 9:
1423                                 vc->vc_report_mouse = on_off ? 1 : 0;
1424                                 break;
1425                         case 25:                /* Cursor on/off */
1426                                 vc->vc_deccm = on_off;
1427                                 break;
1428                         case 1000:
1429                                 vc->vc_report_mouse = on_off ? 2 : 0;
1430                                 break;
1431                         }
1432                 } else {
1433                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1434                         case 3:                 /* Monitor (display ctrls) */
1435                                 vc->vc_disp_ctrl = on_off;
1436                                 break;
1437                         case 4:                 /* Insert Mode on/off */
1438                                 vc->vc_decim = on_off;
1439                                 break;
1440                         case 20:                /* Lf, Enter == CrLf/Lf */
1441                                 if (on_off)
1442                                         set_kbd(vc, lnm);
1443                                 else
1444                                         clr_kbd(vc, lnm);
1445                                 break;
1446                         }
1447                 }
1448 }
1449
1450 /* console_lock is held */
1451 static void setterm_command(struct vc_data *vc)
1452 {
1453         switch(vc->vc_par[0]) {
1454                 case 1: /* set color for underline mode */
1455                         if (vc->vc_can_do_color &&
1456                                         vc->vc_par[1] < 16) {
1457                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1458                                 if (vc->vc_underline)
1459                                         update_attr(vc);
1460                         }
1461                         break;
1462                 case 2: /* set color for half intensity mode */
1463                         if (vc->vc_can_do_color &&
1464                                         vc->vc_par[1] < 16) {
1465                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1466                                 if (vc->vc_intensity == 0)
1467                                         update_attr(vc);
1468                         }
1469                         break;
1470                 case 8: /* store colors as defaults */
1471                         vc->vc_def_color = vc->vc_attr;
1472                         if (vc->vc_hi_font_mask == 0x100)
1473                                 vc->vc_def_color >>= 1;
1474                         default_attr(vc);
1475                         update_attr(vc);
1476                         break;
1477                 case 9: /* set blanking interval */
1478                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1479                         poke_blanked_console();
1480                         break;
1481                 case 10: /* set bell frequency in Hz */
1482                         if (vc->vc_npar >= 1)
1483                                 vc->vc_bell_pitch = vc->vc_par[1];
1484                         else
1485                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1486                         break;
1487                 case 11: /* set bell duration in msec */
1488                         if (vc->vc_npar >= 1)
1489                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1490                                         vc->vc_par[1] * HZ / 1000 : 0;
1491                         else
1492                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1493                         break;
1494                 case 12: /* bring specified console to the front */
1495                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1496                                 set_console(vc->vc_par[1] - 1);
1497                         break;
1498                 case 13: /* unblank the screen */
1499                         poke_blanked_console();
1500                         break;
1501                 case 14: /* set vesa powerdown interval */
1502                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1503                         break;
1504                 case 15: /* activate the previous console */
1505                         set_console(last_console);
1506                         break;
1507         }
1508 }
1509
1510 /* console_lock is held */
1511 static void csi_at(struct vc_data *vc, unsigned int nr)
1512 {
1513         if (nr > vc->vc_cols - vc->vc_x)
1514                 nr = vc->vc_cols - vc->vc_x;
1515         else if (!nr)
1516                 nr = 1;
1517         insert_char(vc, nr);
1518 }
1519
1520 /* console_lock is held */
1521 static void csi_L(struct vc_data *vc, unsigned int nr)
1522 {
1523         if (nr > vc->vc_rows - vc->vc_y)
1524                 nr = vc->vc_rows - vc->vc_y;
1525         else if (!nr)
1526                 nr = 1;
1527         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1528         vc->vc_need_wrap = 0;
1529 }
1530
1531 /* console_lock is held */
1532 static void csi_P(struct vc_data *vc, unsigned int nr)
1533 {
1534         if (nr > vc->vc_cols - vc->vc_x)
1535                 nr = vc->vc_cols - vc->vc_x;
1536         else if (!nr)
1537                 nr = 1;
1538         delete_char(vc, nr);
1539 }
1540
1541 /* console_lock is held */
1542 static void csi_M(struct vc_data *vc, unsigned int nr)
1543 {
1544         if (nr > vc->vc_rows - vc->vc_y)
1545                 nr = vc->vc_rows - vc->vc_y;
1546         else if (!nr)
1547                 nr=1;
1548         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1549         vc->vc_need_wrap = 0;
1550 }
1551
1552 /* console_lock is held (except via vc_init->reset_terminal */
1553 static void save_cur(struct vc_data *vc)
1554 {
1555         vc->vc_saved_x          = vc->vc_x;
1556         vc->vc_saved_y          = vc->vc_y;
1557         vc->vc_s_intensity      = vc->vc_intensity;
1558         vc->vc_s_italic         = vc->vc_italic;
1559         vc->vc_s_underline      = vc->vc_underline;
1560         vc->vc_s_blink          = vc->vc_blink;
1561         vc->vc_s_reverse        = vc->vc_reverse;
1562         vc->vc_s_charset        = vc->vc_charset;
1563         vc->vc_s_color          = vc->vc_color;
1564         vc->vc_saved_G0         = vc->vc_G0_charset;
1565         vc->vc_saved_G1         = vc->vc_G1_charset;
1566 }
1567
1568 /* console_lock is held */
1569 static void restore_cur(struct vc_data *vc)
1570 {
1571         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1572         vc->vc_intensity        = vc->vc_s_intensity;
1573         vc->vc_italic           = vc->vc_s_italic;
1574         vc->vc_underline        = vc->vc_s_underline;
1575         vc->vc_blink            = vc->vc_s_blink;
1576         vc->vc_reverse          = vc->vc_s_reverse;
1577         vc->vc_charset          = vc->vc_s_charset;
1578         vc->vc_color            = vc->vc_s_color;
1579         vc->vc_G0_charset       = vc->vc_saved_G0;
1580         vc->vc_G1_charset       = vc->vc_saved_G1;
1581         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1582         update_attr(vc);
1583         vc->vc_need_wrap = 0;
1584 }
1585
1586 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1587         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1588         ESpalette };
1589
1590 /* console_lock is held (except via vc_init()) */
1591 static void reset_terminal(struct vc_data *vc, int do_clear)
1592 {
1593         vc->vc_top              = 0;
1594         vc->vc_bottom           = vc->vc_rows;
1595         vc->vc_state            = ESnormal;
1596         vc->vc_ques             = 0;
1597         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1598         vc->vc_G0_charset       = LAT1_MAP;
1599         vc->vc_G1_charset       = GRAF_MAP;
1600         vc->vc_charset          = 0;
1601         vc->vc_need_wrap        = 0;
1602         vc->vc_report_mouse     = 0;
1603         vc->vc_utf              = default_utf8;
1604         vc->vc_utf_count        = 0;
1605
1606         vc->vc_disp_ctrl        = 0;
1607         vc->vc_toggle_meta      = 0;
1608
1609         vc->vc_decscnm          = 0;
1610         vc->vc_decom            = 0;
1611         vc->vc_decawm           = 1;
1612         vc->vc_deccm            = global_cursor_default;
1613         vc->vc_decim            = 0;
1614
1615         vt_reset_keyboard(vc->vc_num);
1616
1617         vc->vc_cursor_type = cur_default;
1618         vc->vc_complement_mask = vc->vc_s_complement_mask;
1619
1620         default_attr(vc);
1621         update_attr(vc);
1622
1623         vc->vc_tab_stop[0]      = 0x01010100;
1624         vc->vc_tab_stop[1]      =
1625         vc->vc_tab_stop[2]      =
1626         vc->vc_tab_stop[3]      =
1627         vc->vc_tab_stop[4]      =
1628         vc->vc_tab_stop[5]      =
1629         vc->vc_tab_stop[6]      =
1630         vc->vc_tab_stop[7]      = 0x01010101;
1631
1632         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1633         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1634
1635         gotoxy(vc, 0, 0);
1636         save_cur(vc);
1637         if (do_clear)
1638             csi_J(vc, 2);
1639 }
1640
1641 /* console_lock is held */
1642 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1643 {
1644         /*
1645          *  Control characters can be used in the _middle_
1646          *  of an escape sequence.
1647          */
1648         switch (c) {
1649         case 0:
1650                 return;
1651         case 7:
1652                 if (vc->vc_bell_duration)
1653                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1654                 return;
1655         case 8:
1656                 bs(vc);
1657                 return;
1658         case 9:
1659                 vc->vc_pos -= (vc->vc_x << 1);
1660                 while (vc->vc_x < vc->vc_cols - 1) {
1661                         vc->vc_x++;
1662                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1663                                 break;
1664                 }
1665                 vc->vc_pos += (vc->vc_x << 1);
1666                 notify_write(vc, '\t');
1667                 return;
1668         case 10: case 11: case 12:
1669                 lf(vc);
1670                 if (!is_kbd(vc, lnm))
1671                         return;
1672         case 13:
1673                 cr(vc);
1674                 return;
1675         case 14:
1676                 vc->vc_charset = 1;
1677                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1678                 vc->vc_disp_ctrl = 1;
1679                 return;
1680         case 15:
1681                 vc->vc_charset = 0;
1682                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1683                 vc->vc_disp_ctrl = 0;
1684                 return;
1685         case 24: case 26:
1686                 vc->vc_state = ESnormal;
1687                 return;
1688         case 27:
1689                 vc->vc_state = ESesc;
1690                 return;
1691         case 127:
1692                 del(vc);
1693                 return;
1694         case 128+27:
1695                 vc->vc_state = ESsquare;
1696                 return;
1697         }
1698         switch(vc->vc_state) {
1699         case ESesc:
1700                 vc->vc_state = ESnormal;
1701                 switch (c) {
1702                 case '[':
1703                         vc->vc_state = ESsquare;
1704                         return;
1705                 case ']':
1706                         vc->vc_state = ESnonstd;
1707                         return;
1708                 case '%':
1709                         vc->vc_state = ESpercent;
1710                         return;
1711                 case 'E':
1712                         cr(vc);
1713                         lf(vc);
1714                         return;
1715                 case 'M':
1716                         ri(vc);
1717                         return;
1718                 case 'D':
1719                         lf(vc);
1720                         return;
1721                 case 'H':
1722                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1723                         return;
1724                 case 'Z':
1725                         respond_ID(tty);
1726                         return;
1727                 case '7':
1728                         save_cur(vc);
1729                         return;
1730                 case '8':
1731                         restore_cur(vc);
1732                         return;
1733                 case '(':
1734                         vc->vc_state = ESsetG0;
1735                         return;
1736                 case ')':
1737                         vc->vc_state = ESsetG1;
1738                         return;
1739                 case '#':
1740                         vc->vc_state = EShash;
1741                         return;
1742                 case 'c':
1743                         reset_terminal(vc, 1);
1744                         return;
1745                 case '>':  /* Numeric keypad */
1746                         clr_kbd(vc, kbdapplic);
1747                         return;
1748                 case '=':  /* Appl. keypad */
1749                         set_kbd(vc, kbdapplic);
1750                         return;
1751                 }
1752                 return;
1753         case ESnonstd:
1754                 if (c=='P') {   /* palette escape sequence */
1755                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1756                                 vc->vc_par[vc->vc_npar] = 0;
1757                         vc->vc_npar = 0;
1758                         vc->vc_state = ESpalette;
1759                         return;
1760                 } else if (c=='R') {   /* reset palette */
1761                         reset_palette(vc);
1762                         vc->vc_state = ESnormal;
1763                 } else
1764                         vc->vc_state = ESnormal;
1765                 return;
1766         case ESpalette:
1767                 if (isxdigit(c)) {
1768                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1769                         if (vc->vc_npar == 7) {
1770                                 int i = vc->vc_par[0] * 3, j = 1;
1771                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1772                                 vc->vc_palette[i++] += vc->vc_par[j++];
1773                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1774                                 vc->vc_palette[i++] += vc->vc_par[j++];
1775                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1776                                 vc->vc_palette[i] += vc->vc_par[j];
1777                                 set_palette(vc);
1778                                 vc->vc_state = ESnormal;
1779                         }
1780                 } else
1781                         vc->vc_state = ESnormal;
1782                 return;
1783         case ESsquare:
1784                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1785                         vc->vc_par[vc->vc_npar] = 0;
1786                 vc->vc_npar = 0;
1787                 vc->vc_state = ESgetpars;
1788                 if (c == '[') { /* Function key */
1789                         vc->vc_state=ESfunckey;
1790                         return;
1791                 }
1792                 vc->vc_ques = (c == '?');
1793                 if (vc->vc_ques)
1794                         return;
1795         case ESgetpars:
1796                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1797                         vc->vc_npar++;
1798                         return;
1799                 } else if (c>='0' && c<='9') {
1800                         vc->vc_par[vc->vc_npar] *= 10;
1801                         vc->vc_par[vc->vc_npar] += c - '0';
1802                         return;
1803                 } else
1804                         vc->vc_state = ESgotpars;
1805         case ESgotpars:
1806                 vc->vc_state = ESnormal;
1807                 switch(c) {
1808                 case 'h':
1809                         set_mode(vc, 1);
1810                         return;
1811                 case 'l':
1812                         set_mode(vc, 0);
1813                         return;
1814                 case 'c':
1815                         if (vc->vc_ques) {
1816                                 if (vc->vc_par[0])
1817                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1818                                 else
1819                                         vc->vc_cursor_type = cur_default;
1820                                 return;
1821                         }
1822                         break;
1823                 case 'm':
1824                         if (vc->vc_ques) {
1825                                 clear_selection();
1826                                 if (vc->vc_par[0])
1827                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1828                                 else
1829                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1830                                 return;
1831                         }
1832                         break;
1833                 case 'n':
1834                         if (!vc->vc_ques) {
1835                                 if (vc->vc_par[0] == 5)
1836                                         status_report(tty);
1837                                 else if (vc->vc_par[0] == 6)
1838                                         cursor_report(vc, tty);
1839                         }
1840                         return;
1841                 }
1842                 if (vc->vc_ques) {
1843                         vc->vc_ques = 0;
1844                         return;
1845                 }
1846                 switch(c) {
1847                 case 'G': case '`':
1848                         if (vc->vc_par[0])
1849                                 vc->vc_par[0]--;
1850                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1851                         return;
1852                 case 'A':
1853                         if (!vc->vc_par[0])
1854                                 vc->vc_par[0]++;
1855                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1856                         return;
1857                 case 'B': case 'e':
1858                         if (!vc->vc_par[0])
1859                                 vc->vc_par[0]++;
1860                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1861                         return;
1862                 case 'C': case 'a':
1863                         if (!vc->vc_par[0])
1864                                 vc->vc_par[0]++;
1865                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1866                         return;
1867                 case 'D':
1868                         if (!vc->vc_par[0])
1869                                 vc->vc_par[0]++;
1870                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1871                         return;
1872                 case 'E':
1873                         if (!vc->vc_par[0])
1874                                 vc->vc_par[0]++;
1875                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1876                         return;
1877                 case 'F':
1878                         if (!vc->vc_par[0])
1879                                 vc->vc_par[0]++;
1880                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1881                         return;
1882                 case 'd':
1883                         if (vc->vc_par[0])
1884                                 vc->vc_par[0]--;
1885                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1886                         return;
1887                 case 'H': case 'f':
1888                         if (vc->vc_par[0])
1889                                 vc->vc_par[0]--;
1890                         if (vc->vc_par[1])
1891                                 vc->vc_par[1]--;
1892                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1893                         return;
1894                 case 'J':
1895                         csi_J(vc, vc->vc_par[0]);
1896                         return;
1897                 case 'K':
1898                         csi_K(vc, vc->vc_par[0]);
1899                         return;
1900                 case 'L':
1901                         csi_L(vc, vc->vc_par[0]);
1902                         return;
1903                 case 'M':
1904                         csi_M(vc, vc->vc_par[0]);
1905                         return;
1906                 case 'P':
1907                         csi_P(vc, vc->vc_par[0]);
1908                         return;
1909                 case 'c':
1910                         if (!vc->vc_par[0])
1911                                 respond_ID(tty);
1912                         return;
1913                 case 'g':
1914                         if (!vc->vc_par[0])
1915                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1916                         else if (vc->vc_par[0] == 3) {
1917                                 vc->vc_tab_stop[0] =
1918                                         vc->vc_tab_stop[1] =
1919                                         vc->vc_tab_stop[2] =
1920                                         vc->vc_tab_stop[3] =
1921                                         vc->vc_tab_stop[4] =
1922                                         vc->vc_tab_stop[5] =
1923                                         vc->vc_tab_stop[6] =
1924                                         vc->vc_tab_stop[7] = 0;
1925                         }
1926                         return;
1927                 case 'm':
1928                         csi_m(vc);
1929                         return;
1930                 case 'q': /* DECLL - but only 3 leds */
1931                         /* map 0,1,2,3 to 0,1,2,4 */
1932                         if (vc->vc_par[0] < 4)
1933                                 vt_set_led_state(vc->vc_num,
1934                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1935                         return;
1936                 case 'r':
1937                         if (!vc->vc_par[0])
1938                                 vc->vc_par[0]++;
1939                         if (!vc->vc_par[1])
1940                                 vc->vc_par[1] = vc->vc_rows;
1941                         /* Minimum allowed region is 2 lines */
1942                         if (vc->vc_par[0] < vc->vc_par[1] &&
1943                             vc->vc_par[1] <= vc->vc_rows) {
1944                                 vc->vc_top = vc->vc_par[0] - 1;
1945                                 vc->vc_bottom = vc->vc_par[1];
1946                                 gotoxay(vc, 0, 0);
1947                         }
1948                         return;
1949                 case 's':
1950                         save_cur(vc);
1951                         return;
1952                 case 'u':
1953                         restore_cur(vc);
1954                         return;
1955                 case 'X':
1956                         csi_X(vc, vc->vc_par[0]);
1957                         return;
1958                 case '@':
1959                         csi_at(vc, vc->vc_par[0]);
1960                         return;
1961                 case ']': /* setterm functions */
1962                         setterm_command(vc);
1963                         return;
1964                 }
1965                 return;
1966         case ESpercent:
1967                 vc->vc_state = ESnormal;
1968                 switch (c) {
1969                 case '@':  /* defined in ISO 2022 */
1970                         vc->vc_utf = 0;
1971                         return;
1972                 case 'G':  /* prelim official escape code */
1973                 case '8':  /* retained for compatibility */
1974                         vc->vc_utf = 1;
1975                         return;
1976                 }
1977                 return;
1978         case ESfunckey:
1979                 vc->vc_state = ESnormal;
1980                 return;
1981         case EShash:
1982                 vc->vc_state = ESnormal;
1983                 if (c == '8') {
1984                         /* DEC screen alignment test. kludge :-) */
1985                         vc->vc_video_erase_char =
1986                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1987                         csi_J(vc, 2);
1988                         vc->vc_video_erase_char =
1989                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1990                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1991                 }
1992                 return;
1993         case ESsetG0:
1994                 if (c == '0')
1995                         vc->vc_G0_charset = GRAF_MAP;
1996                 else if (c == 'B')
1997                         vc->vc_G0_charset = LAT1_MAP;
1998                 else if (c == 'U')
1999                         vc->vc_G0_charset = IBMPC_MAP;
2000                 else if (c == 'K')
2001                         vc->vc_G0_charset = USER_MAP;
2002                 if (vc->vc_charset == 0)
2003                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2004                 vc->vc_state = ESnormal;
2005                 return;
2006         case ESsetG1:
2007                 if (c == '0')
2008                         vc->vc_G1_charset = GRAF_MAP;
2009                 else if (c == 'B')
2010                         vc->vc_G1_charset = LAT1_MAP;
2011                 else if (c == 'U')
2012                         vc->vc_G1_charset = IBMPC_MAP;
2013                 else if (c == 'K')
2014                         vc->vc_G1_charset = USER_MAP;
2015                 if (vc->vc_charset == 1)
2016                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2017                 vc->vc_state = ESnormal;
2018                 return;
2019         default:
2020                 vc->vc_state = ESnormal;
2021         }
2022 }
2023
2024 /* is_double_width() is based on the wcwidth() implementation by
2025  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2026  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2027  */
2028 struct interval {
2029         uint32_t first;
2030         uint32_t last;
2031 };
2032
2033 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2034 {
2035         int min = 0;
2036         int mid;
2037
2038         if (ucs < table[0].first || ucs > table[max].last)
2039                 return 0;
2040         while (max >= min) {
2041                 mid = (min + max) / 2;
2042                 if (ucs > table[mid].last)
2043                         min = mid + 1;
2044                 else if (ucs < table[mid].first)
2045                         max = mid - 1;
2046                 else
2047                         return 1;
2048         }
2049         return 0;
2050 }
2051
2052 static int is_double_width(uint32_t ucs)
2053 {
2054         static const struct interval double_width[] = {
2055                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2056                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2057                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2058                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2059         };
2060         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2061 }
2062
2063 /* acquires console_lock */
2064 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2065 {
2066 #ifdef VT_BUF_VRAM_ONLY
2067 #define FLUSH do { } while(0);
2068 #else
2069 #define FLUSH if (draw_x >= 0) { \
2070         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2071         draw_x = -1; \
2072         }
2073 #endif
2074
2075         int c, tc, ok, n = 0, draw_x = -1;
2076         unsigned int currcons;
2077         unsigned long draw_from = 0, draw_to = 0;
2078         struct vc_data *vc;
2079         unsigned char vc_attr;
2080         struct vt_notifier_param param;
2081         uint8_t rescan;
2082         uint8_t inverse;
2083         uint8_t width;
2084         u16 himask, charmask;
2085
2086         if (in_interrupt())
2087                 return count;
2088
2089         might_sleep();
2090
2091         console_lock();
2092         vc = tty->driver_data;
2093         if (vc == NULL) {
2094                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2095                 console_unlock();
2096                 return 0;
2097         }
2098
2099         currcons = vc->vc_num;
2100         if (!vc_cons_allocated(currcons)) {
2101                 /* could this happen? */
2102                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2103                 console_unlock();
2104                 return 0;
2105         }
2106
2107         himask = vc->vc_hi_font_mask;
2108         charmask = himask ? 0x1ff : 0xff;
2109
2110         /* undraw cursor first */
2111         if (IS_FG(vc))
2112                 hide_cursor(vc);
2113
2114         param.vc = vc;
2115
2116         while (!tty->stopped && count) {
2117                 int orig = *buf;
2118                 c = orig;
2119                 buf++;
2120                 n++;
2121                 count--;
2122                 rescan = 0;
2123                 inverse = 0;
2124                 width = 1;
2125
2126                 /* Do no translation at all in control states */
2127                 if (vc->vc_state != ESnormal) {
2128                         tc = c;
2129                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2130                     /* Combine UTF-8 into Unicode in vc_utf_char.
2131                      * vc_utf_count is the number of continuation bytes still
2132                      * expected to arrive.
2133                      * vc_npar is the number of continuation bytes arrived so
2134                      * far
2135                      */
2136 rescan_last_byte:
2137                     if ((c & 0xc0) == 0x80) {
2138                         /* Continuation byte received */
2139                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2140                         if (vc->vc_utf_count) {
2141                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2142                             vc->vc_npar++;
2143                             if (--vc->vc_utf_count) {
2144                                 /* Still need some bytes */
2145                                 continue;
2146                             }
2147                             /* Got a whole character */
2148                             c = vc->vc_utf_char;
2149                             /* Reject overlong sequences */
2150                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2151                                         c > utf8_length_changes[vc->vc_npar])
2152                                 c = 0xfffd;
2153                         } else {
2154                             /* Unexpected continuation byte */
2155                             vc->vc_utf_count = 0;
2156                             c = 0xfffd;
2157                         }
2158                     } else {
2159                         /* Single ASCII byte or first byte of a sequence received */
2160                         if (vc->vc_utf_count) {
2161                             /* Continuation byte expected */
2162                             rescan = 1;
2163                             vc->vc_utf_count = 0;
2164                             c = 0xfffd;
2165                         } else if (c > 0x7f) {
2166                             /* First byte of a multibyte sequence received */
2167                             vc->vc_npar = 0;
2168                             if ((c & 0xe0) == 0xc0) {
2169                                 vc->vc_utf_count = 1;
2170                                 vc->vc_utf_char = (c & 0x1f);
2171                             } else if ((c & 0xf0) == 0xe0) {
2172                                 vc->vc_utf_count = 2;
2173                                 vc->vc_utf_char = (c & 0x0f);
2174                             } else if ((c & 0xf8) == 0xf0) {
2175                                 vc->vc_utf_count = 3;
2176                                 vc->vc_utf_char = (c & 0x07);
2177                             } else if ((c & 0xfc) == 0xf8) {
2178                                 vc->vc_utf_count = 4;
2179                                 vc->vc_utf_char = (c & 0x03);
2180                             } else if ((c & 0xfe) == 0xfc) {
2181                                 vc->vc_utf_count = 5;
2182                                 vc->vc_utf_char = (c & 0x01);
2183                             } else {
2184                                 /* 254 and 255 are invalid */
2185                                 c = 0xfffd;
2186                             }
2187                             if (vc->vc_utf_count) {
2188                                 /* Still need some bytes */
2189                                 continue;
2190                             }
2191                         }
2192                         /* Nothing to do if an ASCII byte was received */
2193                     }
2194                     /* End of UTF-8 decoding. */
2195                     /* c is the received character, or U+FFFD for invalid sequences. */
2196                     /* Replace invalid Unicode code points with U+FFFD too */
2197                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2198                         c = 0xfffd;
2199                     tc = c;
2200                 } else {        /* no utf or alternate charset mode */
2201                     tc = vc_translate(vc, c);
2202                 }
2203
2204                 param.c = tc;
2205                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2206                                         &param) == NOTIFY_STOP)
2207                         continue;
2208
2209                 /* If the original code was a control character we
2210                  * only allow a glyph to be displayed if the code is
2211                  * not normally used (such as for cursor movement) or
2212                  * if the disp_ctrl mode has been explicitly enabled.
2213                  * Certain characters (as given by the CTRL_ALWAYS
2214                  * bitmap) are always displayed as control characters,
2215                  * as the console would be pretty useless without
2216                  * them; to display an arbitrary font position use the
2217                  * direct-to-font zone in UTF-8 mode.
2218                  */
2219                 ok = tc && (c >= 32 ||
2220                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2221                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2222                         && (c != 127 || vc->vc_disp_ctrl)
2223                         && (c != 128+27);
2224
2225                 if (vc->vc_state == ESnormal && ok) {
2226                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2227                                 if (is_double_width(c))
2228                                         width = 2;
2229                         }
2230                         /* Now try to find out how to display it */
2231                         tc = conv_uni_to_pc(vc, tc);
2232                         if (tc & ~charmask) {
2233                                 if (tc == -1 || tc == -2) {
2234                                     continue; /* nothing to display */
2235                                 }
2236                                 /* Glyph not found */
2237                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2238                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2239                                        This would make absolutely no sense with Unicode in mind,
2240                                        but do this for ASCII characters since a font may lack
2241                                        Unicode mapping info and we don't want to end up with
2242                                        having question marks only. */
2243                                     tc = c;
2244                                 } else {
2245                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2246                                     tc = conv_uni_to_pc(vc, 0xfffd);
2247                                     if (tc < 0) {
2248                                         inverse = 1;
2249                                         tc = conv_uni_to_pc(vc, '?');
2250                                         if (tc < 0) tc = '?';
2251                                     }
2252                                 }
2253                         }
2254
2255                         if (!inverse) {
2256                                 vc_attr = vc->vc_attr;
2257                         } else {
2258                                 /* invert vc_attr */
2259                                 if (!vc->vc_can_do_color) {
2260                                         vc_attr = (vc->vc_attr) ^ 0x08;
2261                                 } else if (vc->vc_hi_font_mask == 0x100) {
2262                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2263                                 } else {
2264                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2265                                 }
2266                                 FLUSH
2267                         }
2268
2269                         while (1) {
2270                                 if (vc->vc_need_wrap || vc->vc_decim)
2271                                         FLUSH
2272                                 if (vc->vc_need_wrap) {
2273                                         cr(vc);
2274                                         lf(vc);
2275                                 }
2276                                 if (vc->vc_decim)
2277                                         insert_char(vc, 1);
2278                                 scr_writew(himask ?
2279                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2280                                              (vc_attr << 8) + tc,
2281                                            (u16 *) vc->vc_pos);
2282                                 if (DO_UPDATE(vc) && draw_x < 0) {
2283                                         draw_x = vc->vc_x;
2284                                         draw_from = vc->vc_pos;
2285                                 }
2286                                 if (vc->vc_x == vc->vc_cols - 1) {
2287                                         vc->vc_need_wrap = vc->vc_decawm;
2288                                         draw_to = vc->vc_pos + 2;
2289                                 } else {
2290                                         vc->vc_x++;
2291                                         draw_to = (vc->vc_pos += 2);
2292                                 }
2293
2294                                 if (!--width) break;
2295
2296                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2297                                 if (tc < 0) tc = ' ';
2298                         }
2299                         notify_write(vc, c);
2300
2301                         if (inverse) {
2302                                 FLUSH
2303                         }
2304
2305                         if (rescan) {
2306                                 rescan = 0;
2307                                 inverse = 0;
2308                                 width = 1;
2309                                 c = orig;
2310                                 goto rescan_last_byte;
2311                         }
2312                         continue;
2313                 }
2314                 FLUSH
2315                 do_con_trol(tty, vc, orig);
2316         }
2317         FLUSH
2318         console_conditional_schedule();
2319         console_unlock();
2320         notify_update(vc);
2321         return n;
2322 #undef FLUSH
2323 }
2324
2325 /*
2326  * This is the console switching callback.
2327  *
2328  * Doing console switching in a process context allows
2329  * us to do the switches asynchronously (needed when we want
2330  * to switch due to a keyboard interrupt).  Synchronization
2331  * with other console code and prevention of re-entrancy is
2332  * ensured with console_lock.
2333  */
2334 static void console_callback(struct work_struct *ignored)
2335 {
2336         console_lock();
2337
2338         if (want_console >= 0) {
2339                 if (want_console != fg_console &&
2340                     vc_cons_allocated(want_console)) {
2341                         hide_cursor(vc_cons[fg_console].d);
2342                         change_console(vc_cons[want_console].d);
2343                         /* we only changed when the console had already
2344                            been allocated - a new console is not created
2345                            in an interrupt routine */
2346                 }
2347                 want_console = -1;
2348         }
2349         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2350                 do_poke_blanked_console = 0;
2351                 poke_blanked_console();
2352         }
2353         if (scrollback_delta) {
2354                 struct vc_data *vc = vc_cons[fg_console].d;
2355                 clear_selection();
2356                 if (vc->vc_mode == KD_TEXT)
2357                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2358                 scrollback_delta = 0;
2359         }
2360         if (blank_timer_expired) {
2361                 do_blank_screen(0);
2362                 blank_timer_expired = 0;
2363         }
2364         notify_update(vc_cons[fg_console].d);
2365
2366         console_unlock();
2367 }
2368
2369 int set_console(int nr)
2370 {
2371         struct vc_data *vc = vc_cons[fg_console].d;
2372
2373         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2374                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2375
2376                 /*
2377                  * Console switch will fail in console_callback() or
2378                  * change_console() so there is no point scheduling
2379                  * the callback
2380                  *
2381                  * Existing set_console() users don't check the return
2382                  * value so this shouldn't break anything
2383                  */
2384                 return -EINVAL;
2385         }
2386
2387         want_console = nr;
2388         schedule_console_callback();
2389
2390         return 0;
2391 }
2392
2393 struct tty_driver *console_driver;
2394
2395 #ifdef CONFIG_VT_CONSOLE
2396
2397 /**
2398  * vt_kmsg_redirect() - Sets/gets the kernel message console
2399  * @new:        The new virtual terminal number or -1 if the console should stay
2400  *              unchanged
2401  *
2402  * By default, the kernel messages are always printed on the current virtual
2403  * console. However, the user may modify that default with the
2404  * TIOCL_SETKMSGREDIRECT ioctl call.
2405  *
2406  * This function sets the kernel message console to be @new. It returns the old
2407  * virtual console number. The virtual terminal number 0 (both as parameter and
2408  * return value) means no redirection (i.e. always printed on the currently
2409  * active console).
2410  *
2411  * The parameter -1 means that only the current console is returned, but the
2412  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2413  * case to make the code more understandable.
2414  *
2415  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2416  * the parameter and always returns 0.
2417  */
2418 int vt_kmsg_redirect(int new)
2419 {
2420         static int kmsg_con;
2421
2422         if (new != -1)
2423                 return xchg(&kmsg_con, new);
2424         else
2425                 return kmsg_con;
2426 }
2427
2428 /*
2429  *      Console on virtual terminal
2430  *
2431  * The console must be locked when we get here.
2432  */
2433
2434 static void vt_console_print(struct console *co, const char *b, unsigned count)
2435 {
2436         struct vc_data *vc = vc_cons[fg_console].d;
2437         unsigned char c;
2438         static DEFINE_SPINLOCK(printing_lock);
2439         const ushort *start;
2440         ushort cnt = 0;
2441         ushort myx;
2442         int kmsg_console;
2443
2444         /* console busy or not yet initialized */
2445         if (!printable)
2446                 return;
2447         if (!spin_trylock(&printing_lock))
2448                 return;
2449
2450         kmsg_console = vt_get_kmsg_redirect();
2451         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2452                 vc = vc_cons[kmsg_console - 1].d;
2453
2454         /* read `x' only after setting currcons properly (otherwise
2455            the `x' macro will read the x of the foreground console). */
2456         myx = vc->vc_x;
2457
2458         if (!vc_cons_allocated(fg_console)) {
2459                 /* impossible */
2460                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2461                 goto quit;
2462         }
2463
2464         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2465                 goto quit;
2466
2467         /* undraw cursor first */
2468         if (IS_FG(vc))
2469                 hide_cursor(vc);
2470
2471         start = (ushort *)vc->vc_pos;
2472
2473         /* Contrived structure to try to emulate original need_wrap behaviour
2474          * Problems caused when we have need_wrap set on '\n' character */
2475         while (count--) {
2476                 c = *b++;
2477                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2478                         if (cnt > 0) {
2479                                 if (CON_IS_VISIBLE(vc))
2480                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2481                                 vc->vc_x += cnt;
2482                                 if (vc->vc_need_wrap)
2483                                         vc->vc_x--;
2484                                 cnt = 0;
2485                         }
2486                         if (c == 8) {           /* backspace */
2487                                 bs(vc);
2488                                 start = (ushort *)vc->vc_pos;
2489                                 myx = vc->vc_x;
2490                                 continue;
2491                         }
2492                         if (c != 13)
2493                                 lf(vc);
2494                         cr(vc);
2495                         start = (ushort *)vc->vc_pos;
2496                         myx = vc->vc_x;
2497                         if (c == 10 || c == 13)
2498                                 continue;
2499                 }
2500                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2501                 notify_write(vc, c);
2502                 cnt++;
2503                 if (myx == vc->vc_cols - 1) {
2504                         vc->vc_need_wrap = 1;
2505                         continue;
2506                 }
2507                 vc->vc_pos += 2;
2508                 myx++;
2509         }
2510         if (cnt > 0) {
2511                 if (CON_IS_VISIBLE(vc))
2512                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2513                 vc->vc_x += cnt;
2514                 if (vc->vc_x == vc->vc_cols) {
2515                         vc->vc_x--;
2516                         vc->vc_need_wrap = 1;
2517                 }
2518         }
2519         set_cursor(vc);
2520         notify_update(vc);
2521
2522 quit:
2523         spin_unlock(&printing_lock);
2524 }
2525
2526 static struct tty_driver *vt_console_device(struct console *c, int *index)
2527 {
2528         *index = c->index ? c->index-1 : fg_console;
2529         return console_driver;
2530 }
2531
2532 static struct console vt_console_driver = {
2533         .name           = "tty",
2534         .write          = vt_console_print,
2535         .device         = vt_console_device,
2536         .unblank        = unblank_screen,
2537         .flags          = CON_PRINTBUFFER,
2538         .index          = -1,
2539 };
2540 #endif
2541
2542 /*
2543  *      Handling of Linux-specific VC ioctls
2544  */
2545
2546 /*
2547  * Generally a bit racy with respect to console_lock();.
2548  *
2549  * There are some functions which don't need it.
2550  *
2551  * There are some functions which can sleep for arbitrary periods
2552  * (paste_selection) but we don't need the lock there anyway.
2553  *
2554  * set_selection has locking, and definitely needs it
2555  */
2556
2557 int tioclinux(struct tty_struct *tty, unsigned long arg)
2558 {
2559         char type, data;
2560         char __user *p = (char __user *)arg;
2561         int lines;
2562         int ret;
2563
2564         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2565                 return -EPERM;
2566         if (get_user(type, p))
2567                 return -EFAULT;
2568         ret = 0;
2569
2570         switch (type)
2571         {
2572                 case TIOCL_SETSEL:
2573                         console_lock();
2574                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2575                         console_unlock();
2576                         break;
2577                 case TIOCL_PASTESEL:
2578                         ret = paste_selection(tty);
2579                         break;
2580                 case TIOCL_UNBLANKSCREEN:
2581                         console_lock();
2582                         unblank_screen();
2583                         console_unlock();
2584                         break;
2585                 case TIOCL_SELLOADLUT:
2586                         console_lock();
2587                         ret = sel_loadlut(p);
2588                         console_unlock();
2589                         break;
2590                 case TIOCL_GETSHIFTSTATE:
2591
2592         /*
2593          * Make it possible to react to Shift+Mousebutton.
2594          * Note that 'shift_state' is an undocumented
2595          * kernel-internal variable; programs not closely
2596          * related to the kernel should not use this.
2597          */
2598                         data = vt_get_shift_state();
2599                         ret = __put_user(data, p);
2600                         break;
2601                 case TIOCL_GETMOUSEREPORTING:
2602                         console_lock(); /* May be overkill */
2603                         data = mouse_reporting();
2604                         console_unlock();
2605                         ret = __put_user(data, p);
2606                         break;
2607                 case TIOCL_SETVESABLANK:
2608                         console_lock();
2609                         ret = set_vesa_blanking(p);
2610                         console_unlock();
2611                         break;
2612                 case TIOCL_GETKMSGREDIRECT:
2613                         data = vt_get_kmsg_redirect();
2614                         ret = __put_user(data, p);
2615                         break;
2616                 case TIOCL_SETKMSGREDIRECT:
2617                         if (!capable(CAP_SYS_ADMIN)) {
2618                                 ret = -EPERM;
2619                         } else {
2620                                 if (get_user(data, p+1))
2621                                         ret = -EFAULT;
2622                                 else
2623                                         vt_kmsg_redirect(data);
2624                         }
2625                         break;
2626                 case TIOCL_GETFGCONSOLE:
2627                         /* No locking needed as this is a transiently
2628                            correct return anyway if the caller hasn't
2629                            disabled switching */
2630                         ret = fg_console;
2631                         break;
2632                 case TIOCL_SCROLLCONSOLE:
2633                         if (get_user(lines, (s32 __user *)(p+4))) {
2634                                 ret = -EFAULT;
2635                         } else {
2636                                 /* Need the console lock here. Note that lots
2637                                    of other calls need fixing before the lock
2638                                    is actually useful ! */
2639                                 console_lock();
2640                                 scrollfront(vc_cons[fg_console].d, lines);
2641                                 console_unlock();
2642                                 ret = 0;
2643                         }
2644                         break;
2645                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2646                         console_lock();
2647                         ignore_poke = 1;
2648                         do_blank_screen(0);
2649                         console_unlock();
2650                         break;
2651                 case TIOCL_BLANKEDSCREEN:
2652                         ret = console_blanked;
2653                         break;
2654                 default:
2655                         ret = -EINVAL;
2656                         break;
2657         }
2658         return ret;
2659 }
2660
2661 /*
2662  * /dev/ttyN handling
2663  */
2664
2665 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2666 {
2667         int     retval;
2668
2669         retval = do_con_write(tty, buf, count);
2670         con_flush_chars(tty);
2671
2672         return retval;
2673 }
2674
2675 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2676 {
2677         if (in_interrupt())
2678                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2679         return do_con_write(tty, &ch, 1);
2680 }
2681
2682 static int con_write_room(struct tty_struct *tty)
2683 {
2684         if (tty->stopped)
2685                 return 0;
2686         return 32768;           /* No limit, really; we're not buffering */
2687 }
2688
2689 static int con_chars_in_buffer(struct tty_struct *tty)
2690 {
2691         return 0;               /* we're not buffering */
2692 }
2693
2694 /*
2695  * con_throttle and con_unthrottle are only used for
2696  * paste_selection(), which has to stuff in a large number of
2697  * characters...
2698  */
2699 static void con_throttle(struct tty_struct *tty)
2700 {
2701 }
2702
2703 static void con_unthrottle(struct tty_struct *tty)
2704 {
2705         struct vc_data *vc = tty->driver_data;
2706
2707         wake_up_interruptible(&vc->paste_wait);
2708 }
2709
2710 /*
2711  * Turn the Scroll-Lock LED on when the tty is stopped
2712  */
2713 static void con_stop(struct tty_struct *tty)
2714 {
2715         int console_num;
2716         if (!tty)
2717                 return;
2718         console_num = tty->index;
2719         if (!vc_cons_allocated(console_num))
2720                 return;
2721         vt_kbd_con_stop(console_num);
2722 }
2723
2724 /*
2725  * Turn the Scroll-Lock LED off when the console is started
2726  */
2727 static void con_start(struct tty_struct *tty)
2728 {
2729         int console_num;
2730         if (!tty)
2731                 return;
2732         console_num = tty->index;
2733         if (!vc_cons_allocated(console_num))
2734                 return;
2735         vt_kbd_con_start(console_num);
2736 }
2737
2738 static void con_flush_chars(struct tty_struct *tty)
2739 {
2740         struct vc_data *vc;
2741
2742         if (in_interrupt())     /* from flush_to_ldisc */
2743                 return;
2744
2745         /* if we race with con_close(), vt may be null */
2746         console_lock();
2747         vc = tty->driver_data;
2748         if (vc)
2749                 set_cursor(vc);
2750         console_unlock();
2751 }
2752
2753 /*
2754  * Allocate the console screen memory.
2755  */
2756 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2757 {
2758         unsigned int currcons = tty->index;
2759         struct vc_data *vc;
2760         int ret;
2761
2762         console_lock();
2763         ret = vc_allocate(currcons);
2764         if (ret)
2765                 goto unlock;
2766
2767         vc = vc_cons[currcons].d;
2768
2769         /* Still being freed */
2770         if (vc->port.tty) {
2771                 ret = -ERESTARTSYS;
2772                 goto unlock;
2773         }
2774
2775         ret = tty_port_install(&vc->port, driver, tty);
2776         if (ret)
2777                 goto unlock;
2778
2779         tty->driver_data = vc;
2780         vc->port.tty = tty;
2781
2782         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2783                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2784                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2785         }
2786         if (vc->vc_utf)
2787                 tty->termios.c_iflag |= IUTF8;
2788         else
2789                 tty->termios.c_iflag &= ~IUTF8;
2790 unlock:
2791         console_unlock();
2792         return ret;
2793 }
2794
2795 static int con_open(struct tty_struct *tty, struct file *filp)
2796 {
2797         /* everything done in install */
2798         return 0;
2799 }
2800
2801
2802 static void con_close(struct tty_struct *tty, struct file *filp)
2803 {
2804         /* Nothing to do - we defer to shutdown */
2805 }
2806
2807 static void con_shutdown(struct tty_struct *tty)
2808 {
2809         struct vc_data *vc = tty->driver_data;
2810         BUG_ON(vc == NULL);
2811         console_lock();
2812         vc->port.tty = NULL;
2813         console_unlock();
2814 }
2815
2816 static int default_italic_color    = 2; // green (ASCII)
2817 static int default_underline_color = 3; // cyan (ASCII)
2818 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2819 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2820
2821 static void vc_init(struct vc_data *vc, unsigned int rows,
2822                     unsigned int cols, int do_clear)
2823 {
2824         int j, k ;
2825
2826         vc->vc_cols = cols;
2827         vc->vc_rows = rows;
2828         vc->vc_size_row = cols << 1;
2829         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2830
2831         set_origin(vc);
2832         vc->vc_pos = vc->vc_origin;
2833         reset_vc(vc);
2834         for (j=k=0; j<16; j++) {
2835                 vc->vc_palette[k++] = default_red[j] ;
2836                 vc->vc_palette[k++] = default_grn[j] ;
2837                 vc->vc_palette[k++] = default_blu[j] ;
2838         }
2839         vc->vc_def_color       = 0x07;   /* white */
2840         vc->vc_ulcolor         = default_underline_color;
2841         vc->vc_itcolor         = default_italic_color;
2842         vc->vc_halfcolor       = 0x08;   /* grey */
2843         init_waitqueue_head(&vc->paste_wait);
2844         reset_terminal(vc, do_clear);
2845 }
2846
2847 /*
2848  * This routine initializes console interrupts, and does nothing
2849  * else. If you want the screen to clear, call tty_write with
2850  * the appropriate escape-sequence.
2851  */
2852
2853 static int __init con_init(void)
2854 {
2855         const char *display_desc = NULL;
2856         struct vc_data *vc;
2857         unsigned int currcons = 0, i;
2858
2859         console_lock();
2860
2861         if (conswitchp)
2862                 display_desc = conswitchp->con_startup();
2863         if (!display_desc) {
2864                 fg_console = 0;
2865                 console_unlock();
2866                 return 0;
2867         }
2868
2869         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2870                 struct con_driver *con_driver = &registered_con_driver[i];
2871
2872                 if (con_driver->con == NULL) {
2873                         con_driver->con = conswitchp;
2874                         con_driver->desc = display_desc;
2875                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2876                         con_driver->first = 0;
2877                         con_driver->last = MAX_NR_CONSOLES - 1;
2878                         break;
2879                 }
2880         }
2881
2882         for (i = 0; i < MAX_NR_CONSOLES; i++)
2883                 con_driver_map[i] = conswitchp;
2884
2885         if (blankinterval) {
2886                 blank_state = blank_normal_wait;
2887                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2888         }
2889
2890         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2891                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2892                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2893                 tty_port_init(&vc->port);
2894                 visual_init(vc, currcons, 1);
2895                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2896                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2897                         currcons || !vc->vc_sw->con_save_screen);
2898         }
2899         currcons = fg_console = 0;
2900         master_display_fg = vc = vc_cons[currcons].d;
2901         set_origin(vc);
2902         save_screen(vc);
2903         gotoxy(vc, vc->vc_x, vc->vc_y);
2904         csi_J(vc, 0);
2905         update_screen(vc);
2906         pr_info("Console: %s %s %dx%d\n",
2907                 vc->vc_can_do_color ? "colour" : "mono",
2908                 display_desc, vc->vc_cols, vc->vc_rows);
2909         printable = 1;
2910
2911         console_unlock();
2912
2913 #ifdef CONFIG_VT_CONSOLE
2914         register_console(&vt_console_driver);
2915 #endif
2916         return 0;
2917 }
2918 console_initcall(con_init);
2919
2920 static const struct tty_operations con_ops = {
2921         .install = con_install,
2922         .open = con_open,
2923         .close = con_close,
2924         .write = con_write,
2925         .write_room = con_write_room,
2926         .put_char = con_put_char,
2927         .flush_chars = con_flush_chars,
2928         .chars_in_buffer = con_chars_in_buffer,
2929         .ioctl = vt_ioctl,
2930 #ifdef CONFIG_COMPAT
2931         .compat_ioctl = vt_compat_ioctl,
2932 #endif
2933         .stop = con_stop,
2934         .start = con_start,
2935         .throttle = con_throttle,
2936         .unthrottle = con_unthrottle,
2937         .resize = vt_resize,
2938         .shutdown = con_shutdown
2939 };
2940
2941 static struct cdev vc0_cdev;
2942
2943 static ssize_t show_tty_active(struct device *dev,
2944                                 struct device_attribute *attr, char *buf)
2945 {
2946         return sprintf(buf, "tty%d\n", fg_console + 1);
2947 }
2948 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2949
2950 int __init vty_init(const struct file_operations *console_fops)
2951 {
2952         cdev_init(&vc0_cdev, console_fops);
2953         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2954             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2955                 panic("Couldn't register /dev/tty0 driver\n");
2956         tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2957         if (IS_ERR(tty0dev))
2958                 tty0dev = NULL;
2959         else
2960                 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2961
2962         vcs_init();
2963
2964         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2965         if (!console_driver)
2966                 panic("Couldn't allocate console driver\n");
2967
2968         console_driver->name = "tty";
2969         console_driver->name_base = 1;
2970         console_driver->major = TTY_MAJOR;
2971         console_driver->minor_start = 1;
2972         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2973         console_driver->init_termios = tty_std_termios;
2974         if (default_utf8)
2975                 console_driver->init_termios.c_iflag |= IUTF8;
2976         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2977         tty_set_operations(console_driver, &con_ops);
2978         if (tty_register_driver(console_driver))
2979                 panic("Couldn't register console driver\n");
2980         kbd_init();
2981         console_map_init();
2982 #ifdef CONFIG_MDA_CONSOLE
2983         mda_console_init();
2984 #endif
2985         return 0;
2986 }
2987
2988 #ifndef VT_SINGLE_DRIVER
2989
2990 static struct class *vtconsole_class;
2991
2992 static int do_bind_con_driver(const struct consw *csw, int first, int last,
2993                            int deflt)
2994 {
2995         struct module *owner = csw->owner;
2996         const char *desc = NULL;
2997         struct con_driver *con_driver;
2998         int i, j = -1, k = -1, retval = -ENODEV;
2999
3000         if (!try_module_get(owner))
3001                 return -ENODEV;
3002
3003         WARN_CONSOLE_UNLOCKED();
3004
3005         /* check if driver is registered */
3006         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3007                 con_driver = &registered_con_driver[i];
3008
3009                 if (con_driver->con == csw) {
3010                         desc = con_driver->desc;
3011                         retval = 0;
3012                         break;
3013                 }
3014         }
3015
3016         if (retval)
3017                 goto err;
3018
3019         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3020                 csw->con_startup();
3021                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3022         }
3023
3024         if (deflt) {
3025                 if (conswitchp)
3026                         module_put(conswitchp->owner);
3027
3028                 __module_get(owner);
3029                 conswitchp = csw;
3030         }
3031
3032         first = max(first, con_driver->first);
3033         last = min(last, con_driver->last);
3034
3035         for (i = first; i <= last; i++) {
3036                 int old_was_color;
3037                 struct vc_data *vc = vc_cons[i].d;
3038
3039                 if (con_driver_map[i])
3040                         module_put(con_driver_map[i]->owner);
3041                 __module_get(owner);
3042                 con_driver_map[i] = csw;
3043
3044                 if (!vc || !vc->vc_sw)
3045                         continue;
3046
3047                 j = i;
3048
3049                 if (CON_IS_VISIBLE(vc)) {
3050                         k = i;
3051                         save_screen(vc);
3052                 }
3053
3054                 old_was_color = vc->vc_can_do_color;
3055                 vc->vc_sw->con_deinit(vc);
3056                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3057                 visual_init(vc, i, 0);
3058                 set_origin(vc);
3059                 update_attr(vc);
3060
3061                 /* If the console changed between mono <-> color, then
3062                  * the attributes in the screenbuf will be wrong.  The
3063                  * following resets all attributes to something sane.
3064                  */
3065                 if (old_was_color != vc->vc_can_do_color)
3066                         clear_buffer_attributes(vc);
3067         }
3068
3069         pr_info("Console: switching ");
3070         if (!deflt)
3071                 printk("consoles %d-%d ", first+1, last+1);
3072         if (j >= 0) {
3073                 struct vc_data *vc = vc_cons[j].d;
3074
3075                 printk("to %s %s %dx%d\n",
3076                        vc->vc_can_do_color ? "colour" : "mono",
3077                        desc, vc->vc_cols, vc->vc_rows);
3078
3079                 if (k >= 0) {
3080                         vc = vc_cons[k].d;
3081                         update_screen(vc);
3082                 }
3083         } else
3084                 printk("to %s\n", desc);
3085
3086         retval = 0;
3087 err:
3088         module_put(owner);
3089         return retval;
3090 };
3091
3092
3093 static int bind_con_driver(const struct consw *csw, int first, int last,
3094                            int deflt)
3095 {
3096         int ret;
3097
3098         console_lock();
3099         ret = do_bind_con_driver(csw, first, last, deflt);
3100         console_unlock();
3101         return ret;
3102 }
3103
3104 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3105 static int con_is_graphics(const struct consw *csw, int first, int last)
3106 {
3107         int i, retval = 0;
3108
3109         for (i = first; i <= last; i++) {
3110                 struct vc_data *vc = vc_cons[i].d;
3111
3112                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3113                         retval = 1;
3114                         break;
3115                 }
3116         }
3117
3118         return retval;
3119 }
3120
3121 /**
3122  * unbind_con_driver - unbind a console driver
3123  * @csw: pointer to console driver to unregister
3124  * @first: first in range of consoles that @csw should be unbound from
3125  * @last: last in range of consoles that @csw should be unbound from
3126  * @deflt: should next bound console driver be default after @csw is unbound?
3127  *
3128  * To unbind a driver from all possible consoles, pass 0 as @first and
3129  * %MAX_NR_CONSOLES as @last.
3130  *
3131  * @deflt controls whether the console that ends up replacing @csw should be
3132  * the default console.
3133  *
3134  * RETURNS:
3135  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3136  * or 0 on success.
3137  */
3138 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3139 {
3140         int retval;
3141
3142         console_lock();
3143         retval = do_unbind_con_driver(csw, first, last, deflt);
3144         console_unlock();
3145         return retval;
3146 }
3147 EXPORT_SYMBOL(unbind_con_driver);
3148
3149 /* unlocked version of unbind_con_driver() */
3150 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3151 {
3152         struct module *owner = csw->owner;
3153         const struct consw *defcsw = NULL;
3154         struct con_driver *con_driver = NULL, *con_back = NULL;
3155         int i, retval = -ENODEV;
3156
3157         if (!try_module_get(owner))
3158                 return -ENODEV;
3159
3160         WARN_CONSOLE_UNLOCKED();
3161
3162         /* check if driver is registered and if it is unbindable */
3163         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3164                 con_driver = &registered_con_driver[i];
3165
3166                 if (con_driver->con == csw &&
3167                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3168                         retval = 0;
3169                         break;
3170                 }
3171         }
3172
3173         if (retval)
3174                 goto err;
3175
3176         retval = -ENODEV;
3177
3178         /* check if backup driver exists */
3179         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3180                 con_back = &registered_con_driver[i];
3181
3182                 if (con_back->con &&
3183                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3184                         defcsw = con_back->con;
3185                         retval = 0;
3186                         break;
3187                 }
3188         }
3189
3190         if (retval)
3191                 goto err;
3192
3193         if (!con_is_bound(csw))
3194                 goto err;
3195
3196         first = max(first, con_driver->first);
3197         last = min(last, con_driver->last);
3198
3199         for (i = first; i <= last; i++) {
3200                 if (con_driver_map[i] == csw) {
3201                         module_put(csw->owner);
3202                         con_driver_map[i] = NULL;
3203                 }
3204         }
3205
3206         if (!con_is_bound(defcsw)) {
3207                 const struct consw *defconsw = conswitchp;
3208
3209                 defcsw->con_startup();
3210                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3211                 /*
3212                  * vgacon may change the default driver to point
3213                  * to dummycon, we restore it here...
3214                  */
3215                 conswitchp = defconsw;
3216         }
3217
3218         if (!con_is_bound(csw))
3219                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3220
3221         /* ignore return value, binding should not fail */
3222         do_bind_con_driver(defcsw, first, last, deflt);
3223 err:
3224         module_put(owner);
3225         return retval;
3226
3227 }
3228 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3229
3230 static int vt_bind(struct con_driver *con)
3231 {
3232         const struct consw *defcsw = NULL, *csw = NULL;
3233         int i, more = 1, first = -1, last = -1, deflt = 0;
3234
3235         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3236             con_is_graphics(con->con, con->first, con->last))
3237                 goto err;
3238
3239         csw = con->con;
3240
3241         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3242                 struct con_driver *con = &registered_con_driver[i];
3243
3244                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3245                         defcsw = con->con;
3246                         break;
3247                 }
3248         }
3249
3250         if (!defcsw)
3251                 goto err;
3252
3253         while (more) {
3254                 more = 0;
3255
3256                 for (i = con->first; i <= con->last; i++) {
3257                         if (con_driver_map[i] == defcsw) {
3258                                 if (first == -1)
3259                                         first = i;
3260                                 last = i;
3261                                 more = 1;
3262                         } else if (first != -1)
3263                                 break;
3264                 }
3265
3266                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3267                         deflt = 1;
3268
3269                 if (first != -1)
3270                         bind_con_driver(csw, first, last, deflt);
3271
3272                 first = -1;
3273                 last = -1;
3274                 deflt = 0;
3275         }
3276
3277 err:
3278         return 0;
3279 }
3280
3281 static int vt_unbind(struct con_driver *con)
3282 {
3283         const struct consw *csw = NULL;
3284         int i, more = 1, first = -1, last = -1, deflt = 0;
3285
3286         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3287             con_is_graphics(con->con, con->first, con->last))
3288                 goto err;
3289
3290         csw = con->con;
3291
3292         while (more) {
3293                 more = 0;
3294
3295                 for (i = con->first; i <= con->last; i++) {
3296                         if (con_driver_map[i] == csw) {
3297                                 if (first == -1)
3298                                         first = i;
3299                                 last = i;
3300                                 more = 1;
3301                         } else if (first != -1)
3302                                 break;
3303                 }
3304
3305                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3306                         deflt = 1;
3307
3308                 if (first != -1)
3309                         unbind_con_driver(csw, first, last, deflt);
3310
3311                 first = -1;
3312                 last = -1;
3313                 deflt = 0;
3314         }
3315
3316 err:
3317         return 0;
3318 }
3319 #else
3320 static inline int vt_bind(struct con_driver *con)
3321 {
3322         return 0;
3323 }
3324 static inline int vt_unbind(struct con_driver *con)
3325 {
3326         return 0;
3327 }
3328 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3329
3330 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3331                           const char *buf, size_t count)
3332 {
3333         struct con_driver *con = dev_get_drvdata(dev);
3334         int bind = simple_strtoul(buf, NULL, 0);
3335
3336         if (bind)
3337                 vt_bind(con);
3338         else
3339                 vt_unbind(con);
3340
3341         return count;
3342 }
3343
3344 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3345                          char *buf)
3346 {
3347         struct con_driver *con = dev_get_drvdata(dev);
3348         int bind = con_is_bound(con->con);
3349
3350         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3351 }
3352
3353 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3354                          char *buf)
3355 {
3356         struct con_driver *con = dev_get_drvdata(dev);
3357
3358         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3359                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3360                          con->desc);
3361
3362 }
3363
3364 static struct device_attribute device_attrs[] = {
3365         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3366         __ATTR(name, S_IRUGO, show_name, NULL),
3367 };
3368
3369 static int vtconsole_init_device(struct con_driver *con)
3370 {
3371         int i;
3372         int error = 0;
3373
3374         con->flag |= CON_DRIVER_FLAG_ATTR;
3375         dev_set_drvdata(con->dev, con);
3376         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3377                 error = device_create_file(con->dev, &device_attrs[i]);
3378                 if (error)
3379                         break;
3380         }
3381
3382         if (error) {
3383                 while (--i >= 0)
3384                         device_remove_file(con->dev, &device_attrs[i]);
3385                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3386         }
3387
3388         return error;
3389 }
3390
3391 static void vtconsole_deinit_device(struct con_driver *con)
3392 {
3393         int i;
3394
3395         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3396                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3397                         device_remove_file(con->dev, &device_attrs[i]);
3398                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3399         }
3400 }
3401
3402 /**
3403  * con_is_bound - checks if driver is bound to the console
3404  * @csw: console driver
3405  *
3406  * RETURNS: zero if unbound, nonzero if bound
3407  *
3408  * Drivers can call this and if zero, they should release
3409  * all resources allocated on con_startup()
3410  */
3411 int con_is_bound(const struct consw *csw)
3412 {
3413         int i, bound = 0;
3414
3415         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3416                 if (con_driver_map[i] == csw) {
3417                         bound = 1;
3418                         break;
3419                 }
3420         }
3421
3422         return bound;
3423 }
3424 EXPORT_SYMBOL(con_is_bound);
3425
3426 /**
3427  * con_debug_enter - prepare the console for the kernel debugger
3428  * @sw: console driver
3429  *
3430  * Called when the console is taken over by the kernel debugger, this
3431  * function needs to save the current console state, then put the console
3432  * into a state suitable for the kernel debugger.
3433  *
3434  * RETURNS:
3435  * Zero on success, nonzero if a failure occurred when trying to prepare
3436  * the console for the debugger.
3437  */
3438 int con_debug_enter(struct vc_data *vc)
3439 {
3440         int ret = 0;
3441
3442         saved_fg_console = fg_console;
3443         saved_last_console = last_console;
3444         saved_want_console = want_console;
3445         saved_vc_mode = vc->vc_mode;
3446         saved_console_blanked = console_blanked;
3447         vc->vc_mode = KD_TEXT;
3448         console_blanked = 0;
3449         if (vc->vc_sw->con_debug_enter)
3450                 ret = vc->vc_sw->con_debug_enter(vc);
3451 #ifdef CONFIG_KGDB_KDB
3452         /* Set the initial LINES variable if it is not already set */
3453         if (vc->vc_rows < 999) {
3454                 int linecount;
3455                 char lns[4];
3456                 const char *setargs[3] = {
3457                         "set",
3458                         "LINES",
3459                         lns,
3460                 };
3461                 if (kdbgetintenv(setargs[0], &linecount)) {
3462                         snprintf(lns, 4, "%i", vc->vc_rows);
3463                         kdb_set(2, setargs);
3464                 }
3465         }
3466         if (vc->vc_cols < 999) {
3467                 int colcount;
3468                 char cols[4];
3469                 const char *setargs[3] = {
3470                         "set",
3471                         "COLUMNS",
3472                         cols,
3473                 };
3474                 if (kdbgetintenv(setargs[0], &colcount)) {
3475                         snprintf(cols, 4, "%i", vc->vc_cols);
3476                         kdb_set(2, setargs);
3477                 }
3478         }
3479 #endif /* CONFIG_KGDB_KDB */
3480         return ret;
3481 }
3482 EXPORT_SYMBOL_GPL(con_debug_enter);
3483
3484 /**
3485  * con_debug_leave - restore console state
3486  * @sw: console driver
3487  *
3488  * Restore the console state to what it was before the kernel debugger
3489  * was invoked.
3490  *
3491  * RETURNS:
3492  * Zero on success, nonzero if a failure occurred when trying to restore
3493  * the console.
3494  */
3495 int con_debug_leave(void)
3496 {
3497         struct vc_data *vc;
3498         int ret = 0;
3499
3500         fg_console = saved_fg_console;
3501         last_console = saved_last_console;
3502         want_console = saved_want_console;
3503         console_blanked = saved_console_blanked;
3504         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3505
3506         vc = vc_cons[fg_console].d;
3507         if (vc->vc_sw->con_debug_leave)
3508                 ret = vc->vc_sw->con_debug_leave(vc);
3509         return ret;
3510 }
3511 EXPORT_SYMBOL_GPL(con_debug_leave);
3512
3513 static int do_register_con_driver(const struct consw *csw, int first, int last)
3514 {
3515         struct module *owner = csw->owner;
3516         struct con_driver *con_driver;
3517         const char *desc;
3518         int i, retval = 0;
3519
3520         WARN_CONSOLE_UNLOCKED();
3521
3522         if (!try_module_get(owner))
3523                 return -ENODEV;
3524
3525         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3526                 con_driver = &registered_con_driver[i];
3527
3528                 /* already registered */
3529                 if (con_driver->con == csw)
3530                         retval = -EBUSY;
3531         }
3532
3533         if (retval)
3534                 goto err;
3535
3536         desc = csw->con_startup();
3537
3538         if (!desc)
3539                 goto err;
3540
3541         retval = -EINVAL;
3542
3543         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3544                 con_driver = &registered_con_driver[i];
3545
3546                 if (con_driver->con == NULL) {
3547                         con_driver->con = csw;
3548                         con_driver->desc = desc;
3549                         con_driver->node = i;
3550                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3551                                            CON_DRIVER_FLAG_INIT;
3552                         con_driver->first = first;
3553                         con_driver->last = last;
3554                         retval = 0;
3555                         break;
3556                 }
3557         }
3558
3559         if (retval)
3560                 goto err;
3561
3562         con_driver->dev = device_create(vtconsole_class, NULL,
3563                                                 MKDEV(0, con_driver->node),
3564                                                 NULL, "vtcon%i",
3565                                                 con_driver->node);
3566
3567         if (IS_ERR(con_driver->dev)) {
3568                 printk(KERN_WARNING "Unable to create device for %s; "
3569                        "errno = %ld\n", con_driver->desc,
3570                        PTR_ERR(con_driver->dev));
3571                 con_driver->dev = NULL;
3572         } else {
3573                 vtconsole_init_device(con_driver);
3574         }
3575
3576 err:
3577         module_put(owner);
3578         return retval;
3579 }
3580
3581 /**
3582  * register_con_driver - register console driver to console layer
3583  * @csw: console driver
3584  * @first: the first console to take over, minimum value is 0
3585  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3586  *
3587  * DESCRIPTION: This function registers a console driver which can later
3588  * bind to a range of consoles specified by @first and @last. It will
3589  * also initialize the console driver by calling con_startup().
3590  */
3591 int register_con_driver(const struct consw *csw, int first, int last)
3592 {
3593         int retval;
3594
3595         console_lock();
3596         retval = do_register_con_driver(csw, first, last);
3597         console_unlock();
3598         return retval;
3599 }
3600 EXPORT_SYMBOL(register_con_driver);
3601
3602 /**
3603  * unregister_con_driver - unregister console driver from console layer
3604  * @csw: console driver
3605  *
3606  * DESCRIPTION: All drivers that registers to the console layer must
3607  * call this function upon exit, or if the console driver is in a state
3608  * where it won't be able to handle console services, such as the
3609  * framebuffer console without loaded framebuffer drivers.
3610  *
3611  * The driver must unbind first prior to unregistration.
3612  */
3613 int unregister_con_driver(const struct consw *csw)
3614 {
3615         int retval;
3616
3617         console_lock();
3618         retval = do_unregister_con_driver(csw);
3619         console_unlock();
3620         return retval;
3621 }
3622 EXPORT_SYMBOL(unregister_con_driver);
3623
3624 int do_unregister_con_driver(const struct consw *csw)
3625 {
3626         int i, retval = -ENODEV;
3627
3628         /* cannot unregister a bound driver */
3629         if (con_is_bound(csw))
3630                 goto err;
3631
3632         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3633                 struct con_driver *con_driver = &registered_con_driver[i];
3634
3635                 if (con_driver->con == csw &&
3636                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3637                         vtconsole_deinit_device(con_driver);
3638                         device_destroy(vtconsole_class,
3639                                        MKDEV(0, con_driver->node));
3640                         con_driver->con = NULL;
3641                         con_driver->desc = NULL;
3642                         con_driver->dev = NULL;
3643                         con_driver->node = 0;
3644                         con_driver->flag = 0;
3645                         con_driver->first = 0;
3646                         con_driver->last = 0;
3647                         retval = 0;
3648                         break;
3649                 }
3650         }
3651 err:
3652         return retval;
3653 }
3654 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3655
3656 /*
3657  *      If we support more console drivers, this function is used
3658  *      when a driver wants to take over some existing consoles
3659  *      and become default driver for newly opened ones.
3660  *
3661  *      take_over_console is basically a register followed by unbind
3662  */
3663 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3664 {
3665         int err;
3666
3667         err = do_register_con_driver(csw, first, last);
3668         /*
3669          * If we get an busy error we still want to bind the console driver
3670          * and return success, as we may have unbound the console driver
3671          * but not unregistered it.
3672          */
3673         if (err == -EBUSY)
3674                 err = 0;
3675         if (!err)
3676                 do_bind_con_driver(csw, first, last, deflt);
3677
3678         return err;
3679 }
3680 EXPORT_SYMBOL_GPL(do_take_over_console);
3681
3682 /*
3683  *      If we support more console drivers, this function is used
3684  *      when a driver wants to take over some existing consoles
3685  *      and become default driver for newly opened ones.
3686  *
3687  *      take_over_console is basically a register followed by unbind
3688  */
3689 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3690 {
3691         int err;
3692
3693         err = register_con_driver(csw, first, last);
3694         /*
3695          * If we get an busy error we still want to bind the console driver
3696          * and return success, as we may have unbound the console driver
3697          * but not unregistered it.
3698          */
3699         if (err == -EBUSY)
3700                 err = 0;
3701         if (!err)
3702                 bind_con_driver(csw, first, last, deflt);
3703
3704         return err;
3705 }
3706
3707 /*
3708  * give_up_console is a wrapper to unregister_con_driver. It will only
3709  * work if driver is fully unbound.
3710  */
3711 void give_up_console(const struct consw *csw)
3712 {
3713         unregister_con_driver(csw);
3714 }
3715
3716 static int __init vtconsole_class_init(void)
3717 {
3718         int i;
3719
3720         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3721         if (IS_ERR(vtconsole_class)) {
3722                 printk(KERN_WARNING "Unable to create vt console class; "
3723                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3724                 vtconsole_class = NULL;
3725         }
3726
3727         /* Add system drivers to sysfs */
3728         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3729                 struct con_driver *con = &registered_con_driver[i];
3730
3731                 if (con->con && !con->dev) {
3732                         con->dev = device_create(vtconsole_class, NULL,
3733                                                          MKDEV(0, con->node),
3734                                                          NULL, "vtcon%i",
3735                                                          con->node);
3736
3737                         if (IS_ERR(con->dev)) {
3738                                 printk(KERN_WARNING "Unable to create "
3739                                        "device for %s; errno = %ld\n",
3740                                        con->desc, PTR_ERR(con->dev));
3741                                 con->dev = NULL;
3742                         } else {
3743                                 vtconsole_init_device(con);
3744                         }
3745                 }
3746         }
3747
3748         return 0;
3749 }
3750 postcore_initcall(vtconsole_class_init);
3751
3752 #endif
3753
3754 /*
3755  *      Screen blanking
3756  */
3757
3758 static int set_vesa_blanking(char __user *p)
3759 {
3760         unsigned int mode;
3761
3762         if (get_user(mode, p + 1))
3763                 return -EFAULT;
3764
3765         vesa_blank_mode = (mode < 4) ? mode : 0;
3766         return 0;
3767 }
3768
3769 void do_blank_screen(int entering_gfx)
3770 {
3771         struct vc_data *vc = vc_cons[fg_console].d;
3772         int i;
3773
3774         WARN_CONSOLE_UNLOCKED();
3775
3776         if (console_blanked) {
3777                 if (blank_state == blank_vesa_wait) {
3778                         blank_state = blank_off;
3779                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3780                 }
3781                 return;
3782         }
3783
3784         /* entering graphics mode? */
3785         if (entering_gfx) {
3786                 hide_cursor(vc);
3787                 save_screen(vc);
3788                 vc->vc_sw->con_blank(vc, -1, 1);
3789                 console_blanked = fg_console + 1;
3790                 blank_state = blank_off;
3791                 set_origin(vc);
3792                 return;
3793         }
3794
3795         if (blank_state != blank_normal_wait)
3796                 return;
3797         blank_state = blank_off;
3798
3799         /* don't blank graphics */
3800         if (vc->vc_mode != KD_TEXT) {
3801                 console_blanked = fg_console + 1;
3802                 return;
3803         }
3804
3805         hide_cursor(vc);
3806         del_timer_sync(&console_timer);
3807         blank_timer_expired = 0;
3808
3809         save_screen(vc);
3810         /* In case we need to reset origin, blanking hook returns 1 */
3811         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3812         console_blanked = fg_console + 1;
3813         if (i)
3814                 set_origin(vc);
3815
3816         if (console_blank_hook && console_blank_hook(1))
3817                 return;
3818
3819         if (vesa_off_interval && vesa_blank_mode) {
3820                 blank_state = blank_vesa_wait;
3821                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3822         }
3823         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3824 }
3825 EXPORT_SYMBOL(do_blank_screen);
3826
3827 /*
3828  * Called by timer as well as from vt_console_driver
3829  */
3830 void do_unblank_screen(int leaving_gfx)
3831 {
3832         struct vc_data *vc;
3833
3834         /* This should now always be called from a "sane" (read: can schedule)
3835          * context for the sake of the low level drivers, except in the special
3836          * case of oops_in_progress
3837          */
3838         if (!oops_in_progress)
3839                 might_sleep();
3840
3841         WARN_CONSOLE_UNLOCKED();
3842
3843         ignore_poke = 0;
3844         if (!console_blanked)
3845                 return;
3846         if (!vc_cons_allocated(fg_console)) {
3847                 /* impossible */
3848                 pr_warning("unblank_screen: tty %d not allocated ??\n",
3849                            fg_console+1);
3850                 return;
3851         }
3852         vc = vc_cons[fg_console].d;
3853         /* Try to unblank in oops case too */
3854         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3855                 return; /* but leave console_blanked != 0 */
3856
3857         if (blankinterval) {
3858                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3859                 blank_state = blank_normal_wait;
3860         }
3861
3862         console_blanked = 0;
3863         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3864                 /* Low-level driver cannot restore -> do it ourselves */
3865                 update_screen(vc);
3866         if (console_blank_hook)
3867                 console_blank_hook(0);
3868         set_palette(vc);
3869         set_cursor(vc);
3870         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3871 }
3872 EXPORT_SYMBOL(do_unblank_screen);
3873
3874 /*
3875  * This is called by the outside world to cause a forced unblank, mostly for
3876  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3877  * call it with 1 as an argument and so force a mode restore... that may kill
3878  * X or at least garbage the screen but would also make the Oops visible...
3879  */
3880 void unblank_screen(void)
3881 {
3882         do_unblank_screen(0);
3883 }
3884
3885 /*
3886  * We defer the timer blanking to work queue so it can take the console mutex
3887  * (console operations can still happen at irq time, but only from printk which
3888  * has the console mutex. Not perfect yet, but better than no locking
3889  */
3890 static void blank_screen_t(unsigned long dummy)
3891 {
3892         if (unlikely(!keventd_up())) {
3893                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3894                 return;
3895         }
3896         blank_timer_expired = 1;
3897         schedule_work(&console_work);
3898 }
3899
3900 void poke_blanked_console(void)
3901 {
3902         WARN_CONSOLE_UNLOCKED();
3903
3904         /* Add this so we quickly catch whoever might call us in a non
3905          * safe context. Nowadays, unblank_screen() isn't to be called in
3906          * atomic contexts and is allowed to schedule (with the special case
3907          * of oops_in_progress, but that isn't of any concern for this
3908          * function. --BenH.
3909          */
3910         might_sleep();
3911
3912         /* This isn't perfectly race free, but a race here would be mostly harmless,
3913          * at worse, we'll do a spurrious blank and it's unlikely
3914          */
3915         del_timer(&console_timer);
3916         blank_timer_expired = 0;
3917
3918         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3919                 return;
3920         if (console_blanked)
3921                 unblank_screen();
3922         else if (blankinterval) {
3923                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3924                 blank_state = blank_normal_wait;
3925         }
3926 }
3927
3928 /*
3929  *      Palettes
3930  */
3931
3932 static void set_palette(struct vc_data *vc)
3933 {
3934         WARN_CONSOLE_UNLOCKED();
3935
3936         if (vc->vc_mode != KD_GRAPHICS)
3937                 vc->vc_sw->con_set_palette(vc, color_table);
3938 }
3939
3940 /*
3941  * Load palette into the DAC registers. arg points to a colour
3942  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3943  */
3944
3945 int con_set_cmap(unsigned char __user *arg)
3946 {
3947         int i, j, k;
3948         unsigned char colormap[3*16];
3949
3950         if (copy_from_user(colormap, arg, sizeof(colormap)))
3951                 return -EFAULT;
3952
3953         console_lock();
3954         for (i = k = 0; i < 16; i++) {
3955                 default_red[i] = colormap[k++];
3956                 default_grn[i] = colormap[k++];
3957                 default_blu[i] = colormap[k++];
3958         }
3959         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3960                 if (!vc_cons_allocated(i))
3961                         continue;
3962                 for (j = k = 0; j < 16; j++) {
3963                         vc_cons[i].d->vc_palette[k++] = default_red[j];
3964                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
3965                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
3966                 }
3967                 set_palette(vc_cons[i].d);
3968         }
3969         console_unlock();
3970
3971         return 0;
3972 }
3973
3974 int con_get_cmap(unsigned char __user *arg)
3975 {
3976         int i, k;
3977         unsigned char colormap[3*16];
3978
3979         console_lock();
3980         for (i = k = 0; i < 16; i++) {
3981                 colormap[k++] = default_red[i];
3982                 colormap[k++] = default_grn[i];
3983                 colormap[k++] = default_blu[i];
3984         }
3985         console_unlock();
3986
3987         if (copy_to_user(arg, colormap, sizeof(colormap)))
3988                 return -EFAULT;
3989
3990         return 0;
3991 }
3992
3993 void reset_palette(struct vc_data *vc)
3994 {
3995         int j, k;
3996         for (j=k=0; j<16; j++) {
3997                 vc->vc_palette[k++] = default_red[j];
3998                 vc->vc_palette[k++] = default_grn[j];
3999                 vc->vc_palette[k++] = default_blu[j];
4000         }
4001         set_palette(vc);
4002 }
4003
4004 /*
4005  *  Font switching
4006  *
4007  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4008  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 
4009  *  depending on width) reserved for each character which is kinda wasty, but 
4010  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It 
4011  *  is up to the actual low-level console-driver convert data into its favorite
4012  *  format (maybe we should add a `fontoffset' field to the `display'
4013  *  structure so we won't have to convert the fontdata all the time.
4014  *  /Jes
4015  */
4016
4017 #define max_font_size 65536
4018
4019 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4020 {
4021         struct console_font font;
4022         int rc = -EINVAL;
4023         int c;
4024
4025         if (op->data) {
4026                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4027                 if (!font.data)
4028                         return -ENOMEM;
4029         } else
4030                 font.data = NULL;
4031
4032         console_lock();
4033         if (vc->vc_mode != KD_TEXT)
4034                 rc = -EINVAL;
4035         else if (vc->vc_sw->con_font_get)
4036                 rc = vc->vc_sw->con_font_get(vc, &font);
4037         else
4038                 rc = -ENOSYS;
4039         console_unlock();
4040
4041         if (rc)
4042                 goto out;
4043
4044         c = (font.width+7)/8 * 32 * font.charcount;
4045
4046         if (op->data && font.charcount > op->charcount)
4047                 rc = -ENOSPC;
4048         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4049                 if (font.width > op->width || font.height > op->height) 
4050                         rc = -ENOSPC;
4051         } else {
4052                 if (font.width != 8)
4053                         rc = -EIO;
4054                 else if ((op->height && font.height > op->height) ||
4055                          font.height > 32)
4056                         rc = -ENOSPC;
4057         }
4058         if (rc)
4059                 goto out;
4060
4061         op->height = font.height;
4062         op->width = font.width;
4063         op->charcount = font.charcount;
4064
4065         if (op->data && copy_to_user(op->data, font.data, c))
4066                 rc = -EFAULT;
4067
4068 out:
4069         kfree(font.data);
4070         return rc;
4071 }
4072
4073 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4074 {
4075         struct console_font font;
4076         int rc = -EINVAL;
4077         int size;
4078
4079         if (vc->vc_mode != KD_TEXT)
4080                 return -EINVAL;
4081         if (!op->data)
4082                 return -EINVAL;
4083         if (op->charcount > 512)
4084                 return -EINVAL;
4085         if (!op->height) {              /* Need to guess font height [compat] */
4086                 int h, i;
4087                 u8 __user *charmap = op->data;
4088                 u8 tmp;
4089                 
4090                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4091                    so that we can get rid of this soon */
4092                 if (!(op->flags & KD_FONT_FLAG_OLD))
4093                         return -EINVAL;
4094                 for (h = 32; h > 0; h--)
4095                         for (i = 0; i < op->charcount; i++) {
4096                                 if (get_user(tmp, &charmap[32*i+h-1]))
4097                                         return -EFAULT;
4098                                 if (tmp)
4099                                         goto nonzero;
4100                         }
4101                 return -EINVAL;
4102         nonzero:
4103                 op->height = h;
4104         }
4105         if (op->width <= 0 || op->width > 32 || op->height > 32)
4106                 return -EINVAL;
4107         size = (op->width+7)/8 * 32 * op->charcount;
4108         if (size > max_font_size)
4109                 return -ENOSPC;
4110         font.charcount = op->charcount;
4111         font.height = op->height;
4112         font.width = op->width;
4113         font.data = memdup_user(op->data, size);
4114         if (IS_ERR(font.data))
4115                 return PTR_ERR(font.data);
4116         console_lock();
4117         if (vc->vc_mode != KD_TEXT)
4118                 rc = -EINVAL;
4119         else if (vc->vc_sw->con_font_set)
4120                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4121         else
4122                 rc = -ENOSYS;
4123         console_unlock();
4124         kfree(font.data);
4125         return rc;
4126 }
4127
4128 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4129 {
4130         struct console_font font = {.width = op->width, .height = op->height};
4131         char name[MAX_FONT_NAME];
4132         char *s = name;
4133         int rc;
4134
4135
4136         if (!op->data)
4137                 s = NULL;
4138         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4139                 return -EFAULT;
4140         else
4141                 name[MAX_FONT_NAME - 1] = 0;
4142
4143         console_lock();
4144         if (vc->vc_mode != KD_TEXT) {
4145                 console_unlock();
4146                 return -EINVAL;
4147         }
4148         if (vc->vc_sw->con_font_default)
4149                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4150         else
4151                 rc = -ENOSYS;
4152         console_unlock();
4153         if (!rc) {
4154                 op->width = font.width;
4155                 op->height = font.height;
4156         }
4157         return rc;
4158 }
4159
4160 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4161 {
4162         int con = op->height;
4163         int rc;
4164
4165
4166         console_lock();
4167         if (vc->vc_mode != KD_TEXT)
4168                 rc = -EINVAL;
4169         else if (!vc->vc_sw->con_font_copy)
4170                 rc = -ENOSYS;
4171         else if (con < 0 || !vc_cons_allocated(con))
4172                 rc = -ENOTTY;
4173         else if (con == vc->vc_num)     /* nothing to do */
4174                 rc = 0;
4175         else
4176                 rc = vc->vc_sw->con_font_copy(vc, con);
4177         console_unlock();
4178         return rc;
4179 }
4180
4181 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4182 {
4183         switch (op->op) {
4184         case KD_FONT_OP_SET:
4185                 return con_font_set(vc, op);
4186         case KD_FONT_OP_GET:
4187                 return con_font_get(vc, op);
4188         case KD_FONT_OP_SET_DEFAULT:
4189                 return con_font_default(vc, op);
4190         case KD_FONT_OP_COPY:
4191                 return con_font_copy(vc, op);
4192         }
4193         return -ENOSYS;
4194 }
4195
4196 /*
4197  *      Interface exported to selection and vcs.
4198  */
4199
4200 /* used by selection */
4201 u16 screen_glyph(struct vc_data *vc, int offset)
4202 {
4203         u16 w = scr_readw(screenpos(vc, offset, 1));
4204         u16 c = w & 0xff;
4205
4206         if (w & vc->vc_hi_font_mask)
4207                 c |= 0x100;
4208         return c;
4209 }
4210 EXPORT_SYMBOL_GPL(screen_glyph);
4211
4212 /* used by vcs - note the word offset */
4213 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4214 {
4215         return screenpos(vc, 2 * w_offset, viewed);
4216 }
4217
4218 void getconsxy(struct vc_data *vc, unsigned char *p)
4219 {
4220         p[0] = vc->vc_x;
4221         p[1] = vc->vc_y;
4222 }
4223
4224 void putconsxy(struct vc_data *vc, unsigned char *p)
4225 {
4226         hide_cursor(vc);
4227         gotoxy(vc, p[0], p[1]);
4228         set_cursor(vc);
4229 }
4230
4231 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4232 {
4233         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4234                 return softcursor_original;
4235         return scr_readw(org);
4236 }
4237
4238 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4239 {
4240         scr_writew(val, org);
4241         if ((unsigned long)org == vc->vc_pos) {
4242                 softcursor_original = -1;
4243                 add_softcursor(vc);
4244         }
4245 }
4246
4247 void vcs_scr_updated(struct vc_data *vc)
4248 {
4249         notify_update(vc);
4250 }
4251
4252 /*
4253  *      Visible symbols for modules
4254  */
4255
4256 EXPORT_SYMBOL(color_table);
4257 EXPORT_SYMBOL(default_red);
4258 EXPORT_SYMBOL(default_grn);
4259 EXPORT_SYMBOL(default_blu);
4260 EXPORT_SYMBOL(update_region);
4261 EXPORT_SYMBOL(redraw_screen);
4262 EXPORT_SYMBOL(vc_resize);
4263 EXPORT_SYMBOL(fg_console);
4264 EXPORT_SYMBOL(console_blank_hook);
4265 EXPORT_SYMBOL(console_blanked);
4266 EXPORT_SYMBOL(vc_cons);
4267 EXPORT_SYMBOL(global_cursor_default);
4268 #ifndef VT_SINGLE_DRIVER
4269 EXPORT_SYMBOL(take_over_console);
4270 EXPORT_SYMBOL(give_up_console);
4271 #endif