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