drivers/char/vt.c

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