drivers/char/vt.c

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