git.oblomov.eu Git - linux-2.6/blob - drivers/char/vt.c

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