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