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