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             if (!vc->vc_kmalloced)
 741                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 742             if (!vc->vc_screenbuf) {
 743                 kfree(vc);
 744                 vc_cons[currcons].d = NULL;
 745                 return -ENOMEM;
 746             }
 747             vc->vc_kmalloced = 1;
 748             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 749         }
 750         return 0;
 751 }
 752
 753 static inline int resize_screen(struct vc_data *vc, int width, int height)
 754 {
 755         /* Resizes the resolution of the display adapater */
 756         int err = 0;
 757
 758         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 759                 err = vc->vc_sw->con_resize(vc, width, height);
 760         return err;
 761 }
 762
 763 /*
 764  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 765  * [this is to be used together with some user program
 766  * like resize that changes the hardware videomode]
 767  */
 768 #define VC_RESIZE_MAXCOL (32767)
 769 #define VC_RESIZE_MAXROW (32767)
 770 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 771 {
 772         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 773         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 774         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 775         unsigned int end;
 776         unsigned short *newscreen;
 777
 778         WARN_CONSOLE_UNLOCKED();
 779
 780         if (!vc)
 781                 return -ENXIO;
 782
 783         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 784                 return -EINVAL;
 785
 786         new_cols = (cols ? cols : vc->vc_cols);
 787         new_rows = (lines ? lines : vc->vc_rows);
 788         new_row_size = new_cols << 1;
 789         new_screen_size = new_row_size * new_rows;
 790
 791         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 792                 return 0;
 793
 794         newscreen = (unsigned short *) kmalloc(new_screen_size, GFP_USER);
 795         if (!newscreen)
 796                 return -ENOMEM;
 797
 798         old_rows = vc->vc_rows;
 799         old_cols = vc->vc_cols;
 800         old_row_size = vc->vc_size_row;
 801         old_screen_size = vc->vc_screenbuf_size;
 802
 803         err = resize_screen(vc, new_cols, new_rows);
 804         if (err) {
 805                 kfree(newscreen);
 806                 return err;
 807         }
 808
 809         vc->vc_rows = new_rows;
 810         vc->vc_cols = new_cols;
 811         vc->vc_size_row = new_row_size;
 812         vc->vc_screenbuf_size = new_screen_size;
 813
 814         rlth = min(old_row_size, new_row_size);
 815         rrem = new_row_size - rlth;
 816         old_origin = vc->vc_origin;
 817         new_origin = (long) newscreen;
 818         new_scr_end = new_origin + new_screen_size;
 819
 820         if (vc->vc_y > new_rows) {
 821                 if (old_rows - vc->vc_y < new_rows) {
 822                         /*
 823                          * Cursor near the bottom, copy contents from the
 824                          * bottom of buffer
 825                          */
 826                         old_origin += (old_rows - new_rows) * old_row_size;
 827                         end = vc->vc_scr_end;
 828                 } else {
 829                         /*
 830                          * Cursor is in no man's land, copy 1/2 screenful
 831                          * from the top and bottom of cursor position
 832                          */
 833                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 834                         end = old_origin + (old_row_size * new_rows);
 835                 }
 836         } else
 837                 /*
 838                  * Cursor near the top, copy contents from the top of buffer
 839                  */
 840                 end = (old_rows > new_rows) ? old_origin +
 841                         (old_row_size * new_rows) :
 842                         vc->vc_scr_end;
 843
 844         update_attr(vc);
 845
 846         while (old_origin < end) {
 847                 scr_memcpyw((unsigned short *) new_origin,
 848                             (unsigned short *) old_origin, rlth);
 849                 if (rrem)
 850                         scr_memsetw((void *)(new_origin + rlth),
 851                                     vc->vc_video_erase_char, rrem);
 852                 old_origin += old_row_size;
 853                 new_origin += new_row_size;
 854         }
 855         if (new_scr_end > new_origin)
 856                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 857                             new_scr_end - new_origin);
 858         if (vc->vc_kmalloced)
 859                 kfree(vc->vc_screenbuf);
 860         vc->vc_screenbuf = newscreen;
 861         vc->vc_kmalloced = 1;
 862         vc->vc_screenbuf_size = new_screen_size;
 863         set_origin(vc);
 864
 865         /* do part of a reset_terminal() */
 866         vc->vc_top = 0;
 867         vc->vc_bottom = vc->vc_rows;
 868         gotoxy(vc, vc->vc_x, vc->vc_y);
 869         save_cur(vc);
 870
 871         if (vc->vc_tty) {
 872                 struct winsize ws, *cws = &vc->vc_tty->winsize;
 873
 874                 memset(&ws, 0, sizeof(ws));
 875                 ws.ws_row = vc->vc_rows;
 876                 ws.ws_col = vc->vc_cols;
 877                 ws.ws_ypixel = vc->vc_scan_lines;
 878                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
 879                     vc->vc_tty->pgrp > 0)
 880                         kill_pg(vc->vc_tty->pgrp, SIGWINCH, 1);
 881                 *cws = ws;
 882         }
 883
 884         if (CON_IS_VISIBLE(vc))
 885                 update_screen(vc);
 886         return err;
 887 }
 888
 889 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 890 {
 891         int rc;
 892
 893         acquire_console_sem();
 894         rc = vc_resize(vc, cols, lines);
 895         release_console_sem();
 896         return rc;
 897 }
 898
 899 void vc_deallocate(unsigned int currcons)
 900 {
 901         WARN_CONSOLE_UNLOCKED();
 902
 903         if (vc_cons_allocated(currcons)) {
 904                 struct vc_data *vc = vc_cons[currcons].d;
 905                 vc->vc_sw->con_deinit(vc);
 906                 module_put(vc->vc_sw->owner);
 907                 if (vc->vc_kmalloced)
 908                         kfree(vc->vc_screenbuf);
 909                 if (currcons >= MIN_NR_CONSOLES)
 910                         kfree(vc);
 911                 vc_cons[currcons].d = NULL;
 912         }
 913 }
 914
 915 /*
 916  *      VT102 emulator
 917  */
 918
 919 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 920 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 921 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 922
 923 #define decarm          VC_REPEAT
 924 #define decckm          VC_CKMODE
 925 #define kbdapplic       VC_APPLIC
 926 #define lnm             VC_CRLF
 927
 928 /*
 929  * this is what the terminal answers to a ESC-Z or csi0c query.
 930  */
 931 #define VT100ID "\033[?1;2c"
 932 #define VT102ID "\033[?6c"
 933
 934 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
 935                                        8,12,10,14, 9,13,11,15 };
 936
 937 /* the default colour table, for VGA+ colour systems */
 938 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
 939     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
 940 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
 941     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
 942 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
 943     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
 944
 945 /*
 946  * gotoxy() must verify all boundaries, because the arguments
 947  * might also be negative. If the given position is out of
 948  * bounds, the cursor is placed at the nearest margin.
 949  */
 950 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
 951 {
 952         int min_y, max_y;
 953
 954         if (new_x < 0)
 955                 vc->vc_x = 0;
 956         else {
 957                 if (new_x >= vc->vc_cols)
 958                         vc->vc_x = vc->vc_cols - 1;
 959                 else
 960                         vc->vc_x = new_x;
 961         }
 962
 963         if (vc->vc_decom) {
 964                 min_y = vc->vc_top;
 965                 max_y = vc->vc_bottom;
 966         } else {
 967                 min_y = 0;
 968                 max_y = vc->vc_rows;
 969         }
 970         if (new_y < min_y)
 971                 vc->vc_y = min_y;
 972         else if (new_y >= max_y)
 973                 vc->vc_y = max_y - 1;
 974         else
 975                 vc->vc_y = new_y;
 976         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
 977         vc->vc_need_wrap = 0;
 978 }
 979
 980 /* for absolute user moves, when decom is set */
 981 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
 982 {
 983         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
 984 }
 985
 986 void scrollback(struct vc_data *vc, int lines)
 987 {
 988         if (!lines)
 989                 lines = vc->vc_rows / 2;
 990         scrolldelta(-lines);
 991 }
 992
 993 void scrollfront(struct vc_data *vc, int lines)
 994 {
 995         if (!lines)
 996                 lines = vc->vc_rows / 2;
 997         scrolldelta(lines);
 998 }
 999
1000 static void lf(struct vc_data *vc)
1001 {
1002         /* don't scroll if above bottom of scrolling region, or
1003          * if below scrolling region
1004          */
1005         if (vc->vc_y + 1 == vc->vc_bottom)
1006                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1007         else if (vc->vc_y < vc->vc_rows - 1) {
1008                 vc->vc_y++;
1009                 vc->vc_pos += vc->vc_size_row;
1010         }
1011         vc->vc_need_wrap = 0;
1012 }
1013
1014 static void ri(struct vc_data *vc)
1015 {
1016         /* don't scroll if below top of scrolling region, or
1017          * if above scrolling region
1018          */
1019         if (vc->vc_y == vc->vc_top)
1020                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1021         else if (vc->vc_y > 0) {
1022                 vc->vc_y--;
1023                 vc->vc_pos -= vc->vc_size_row;
1024         }
1025         vc->vc_need_wrap = 0;
1026 }
1027
1028 static inline void cr(struct vc_data *vc)
1029 {
1030         vc->vc_pos -= vc->vc_x << 1;
1031         vc->vc_need_wrap = vc->vc_x = 0;
1032 }
1033
1034 static inline void bs(struct vc_data *vc)
1035 {
1036         if (vc->vc_x) {
1037                 vc->vc_pos -= 2;
1038                 vc->vc_x--;
1039                 vc->vc_need_wrap = 0;
1040         }
1041 }
1042
1043 static inline void del(struct vc_data *vc)
1044 {
1045         /* ignored */
1046 }
1047
1048 static void csi_J(struct vc_data *vc, int vpar)
1049 {
1050         unsigned int count;
1051         unsigned short * start;
1052
1053         switch (vpar) {
1054                 case 0: /* erase from cursor to end of display */
1055                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1056                         start = (unsigned short *)vc->vc_pos;
1057                         if (DO_UPDATE(vc)) {
1058                                 /* do in two stages */
1059                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1060                                               vc->vc_cols - vc->vc_x);
1061                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1062                                               vc->vc_rows - vc->vc_y - 1,
1063                                               vc->vc_cols);
1064                         }
1065                         break;
1066                 case 1: /* erase from start to cursor */
1067                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1068                         start = (unsigned short *)vc->vc_origin;
1069                         if (DO_UPDATE(vc)) {
1070                                 /* do in two stages */
1071                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1072                                               vc->vc_cols);
1073                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1074                                               vc->vc_x + 1);
1075                         }
1076                         break;
1077                 case 2: /* erase whole display */
1078                         count = vc->vc_cols * vc->vc_rows;
1079                         start = (unsigned short *)vc->vc_origin;
1080                         if (DO_UPDATE(vc))
1081                                 vc->vc_sw->con_clear(vc, 0, 0,
1082                                               vc->vc_rows,
1083                                               vc->vc_cols);
1084                         break;
1085                 default:
1086                         return;
1087         }
1088         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1089         vc->vc_need_wrap = 0;
1090 }
1091
1092 static void csi_K(struct vc_data *vc, int vpar)
1093 {
1094         unsigned int count;
1095         unsigned short * start;
1096
1097         switch (vpar) {
1098                 case 0: /* erase from cursor to end of line */
1099                         count = vc->vc_cols - vc->vc_x;
1100                         start = (unsigned short *)vc->vc_pos;
1101                         if (DO_UPDATE(vc))
1102                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1103                                                      vc->vc_cols - vc->vc_x);
1104                         break;
1105                 case 1: /* erase from start of line to cursor */
1106                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1107                         count = vc->vc_x + 1;
1108                         if (DO_UPDATE(vc))
1109                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1110                                                      vc->vc_x + 1);
1111                         break;
1112                 case 2: /* erase whole line */
1113                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1114                         count = vc->vc_cols;
1115                         if (DO_UPDATE(vc))
1116                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1117                                               vc->vc_cols);
1118                         break;
1119                 default:
1120                         return;
1121         }
1122         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1123         vc->vc_need_wrap = 0;
1124 }
1125
1126 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1127 {                                         /* not vt100? */
1128         int count;
1129
1130         if (!vpar)
1131                 vpar++;
1132         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1133
1134         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1135         if (DO_UPDATE(vc))
1136                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1137         vc->vc_need_wrap = 0;
1138 }
1139
1140 static void default_attr(struct vc_data *vc)
1141 {
1142         vc->vc_intensity = 1;
1143         vc->vc_underline = 0;
1144         vc->vc_reverse = 0;
1145         vc->vc_blink = 0;
1146         vc->vc_color = vc->vc_def_color;
1147 }
1148
1149 /* console_sem is held */
1150 static void csi_m(struct vc_data *vc)
1151 {
1152         int i;
1153
1154         for (i = 0; i <= vc->vc_npar; i++)
1155                 switch (vc->vc_par[i]) {
1156                         case 0: /* all attributes off */
1157                                 default_attr(vc);
1158                                 break;
1159                         case 1:
1160                                 vc->vc_intensity = 2;
1161                                 break;
1162                         case 2:
1163                                 vc->vc_intensity = 0;
1164                                 break;
1165                         case 4:
1166                                 vc->vc_underline = 1;
1167                                 break;
1168                         case 5:
1169                                 vc->vc_blink = 1;
1170                                 break;
1171                         case 7:
1172                                 vc->vc_reverse = 1;
1173                                 break;
1174                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1175                                   * Select primary font, don't display
1176                                   * control chars if defined, don't set
1177                                   * bit 8 on output.
1178                                   */
1179                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1180                                                 ? vc->vc_G0_charset
1181                                                 : vc->vc_G1_charset, vc);
1182                                 vc->vc_disp_ctrl = 0;
1183                                 vc->vc_toggle_meta = 0;
1184                                 break;
1185                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1186                                   * Select first alternate font, lets
1187                                   * chars < 32 be displayed as ROM chars.
1188                                   */
1189                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1190                                 vc->vc_disp_ctrl = 1;
1191                                 vc->vc_toggle_meta = 0;
1192                                 break;
1193                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1194                                   * Select second alternate font, toggle
1195                                   * high bit before displaying as ROM char.
1196                                   */
1197                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1198                                 vc->vc_disp_ctrl = 1;
1199                                 vc->vc_toggle_meta = 1;
1200                                 break;
1201                         case 21:
1202                         case 22:
1203                                 vc->vc_intensity = 1;
1204                                 break;
1205                         case 24:
1206                                 vc->vc_underline = 0;
1207                                 break;
1208                         case 25:
1209                                 vc->vc_blink = 0;
1210                                 break;
1211                         case 27:
1212                                 vc->vc_reverse = 0;
1213                                 break;
1214                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1215                                   * Enables underscore, white foreground
1216                                   * with white underscore (Linux - use
1217                                   * default foreground).
1218                                   */
1219                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1220                                 vc->vc_underline = 1;
1221                                 break;
1222                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1223                                   * Disable underline option.
1224                                   * Reset colour to default? It did this
1225                                   * before...
1226                                   */
1227                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1228                                 vc->vc_underline = 0;
1229                                 break;
1230                         case 49:
1231                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1232                                 break;
1233                         default:
1234                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1235                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1236                                                 | (vc->vc_color & 0xf0);
1237                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1238                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1239                                                 | (vc->vc_color & 0x0f);
1240                                 break;
1241                 }
1242         update_attr(vc);
1243 }
1244
1245 static void respond_string(const char *p, struct tty_struct *tty)
1246 {
1247         while (*p) {
1248                 tty_insert_flip_char(tty, *p, 0);
1249                 p++;
1250         }
1251         con_schedule_flip(tty);
1252 }
1253
1254 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1255 {
1256         char buf[40];
1257
1258         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1259         respond_string(buf, tty);
1260 }
1261
1262 static inline void status_report(struct tty_struct *tty)
1263 {
1264         respond_string("\033[0n", tty); /* Terminal ok */
1265 }
1266
1267 static inline void respond_ID(struct tty_struct * tty)
1268 {
1269         respond_string(VT102ID, tty);
1270 }
1271
1272 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1273 {
1274         char buf[8];
1275
1276         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1277                 (char)('!' + mry));
1278         respond_string(buf, tty);
1279 }
1280
1281 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1282 int mouse_reporting(void)
1283 {
1284         return vc_cons[fg_console].d->vc_report_mouse;
1285 }
1286
1287 /* console_sem is held */
1288 static void set_mode(struct vc_data *vc, int on_off)
1289 {
1290         int i;
1291
1292         for (i = 0; i <= vc->vc_npar; i++)
1293                 if (vc->vc_ques) {
1294                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1295                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1296                                 if (on_off)
1297                                         set_kbd(vc, decckm);
1298                                 else
1299                                         clr_kbd(vc, decckm);
1300                                 break;
1301                         case 3: /* 80/132 mode switch unimplemented */
1302                                 vc->vc_deccolm = on_off;
1303 #if 0
1304                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1305                                 /* this alone does not suffice; some user mode
1306                                    utility has to change the hardware regs */
1307 #endif
1308                                 break;
1309                         case 5:                 /* Inverted screen on/off */
1310                                 if (vc->vc_decscnm != on_off) {
1311                                         vc->vc_decscnm = on_off;
1312                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1313                                         update_attr(vc);
1314                                 }
1315                                 break;
1316                         case 6:                 /* Origin relative/absolute */
1317                                 vc->vc_decom = on_off;
1318                                 gotoxay(vc, 0, 0);
1319                                 break;
1320                         case 7:                 /* Autowrap on/off */
1321                                 vc->vc_decawm = on_off;
1322                                 break;
1323                         case 8:                 /* Autorepeat on/off */
1324                                 if (on_off)
1325                                         set_kbd(vc, decarm);
1326                                 else
1327                                         clr_kbd(vc, decarm);
1328                                 break;
1329                         case 9:
1330                                 vc->vc_report_mouse = on_off ? 1 : 0;
1331                                 break;
1332                         case 25:                /* Cursor on/off */
1333                                 vc->vc_deccm = on_off;
1334                                 break;
1335                         case 1000:
1336                                 vc->vc_report_mouse = on_off ? 2 : 0;
1337                                 break;
1338                         }
1339                 } else {
1340                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1341                         case 3:                 /* Monitor (display ctrls) */
1342                                 vc->vc_disp_ctrl = on_off;
1343                                 break;
1344                         case 4:                 /* Insert Mode on/off */
1345                                 vc->vc_decim = on_off;
1346                                 break;
1347                         case 20:                /* Lf, Enter == CrLf/Lf */
1348                                 if (on_off)
1349                                         set_kbd(vc, lnm);
1350                                 else
1351                                         clr_kbd(vc, lnm);
1352                                 break;
1353                         }
1354                 }
1355 }
1356
1357 /* console_sem is held */
1358 static void setterm_command(struct vc_data *vc)
1359 {
1360         switch(vc->vc_par[0]) {
1361                 case 1: /* set color for underline mode */
1362                         if (vc->vc_can_do_color &&
1363                                         vc->vc_par[1] < 16) {
1364                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1365                                 if (vc->vc_underline)
1366                                         update_attr(vc);
1367                         }
1368                         break;
1369                 case 2: /* set color for half intensity mode */
1370                         if (vc->vc_can_do_color &&
1371                                         vc->vc_par[1] < 16) {
1372                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1373                                 if (vc->vc_intensity == 0)
1374                                         update_attr(vc);
1375                         }
1376                         break;
1377                 case 8: /* store colors as defaults */
1378                         vc->vc_def_color = vc->vc_attr;
1379                         if (vc->vc_hi_font_mask == 0x100)
1380                                 vc->vc_def_color >>= 1;
1381                         default_attr(vc);
1382                         update_attr(vc);
1383                         break;
1384                 case 9: /* set blanking interval */
1385                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1386                         poke_blanked_console();
1387                         break;
1388                 case 10: /* set bell frequency in Hz */
1389                         if (vc->vc_npar >= 1)
1390                                 vc->vc_bell_pitch = vc->vc_par[1];
1391                         else
1392                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1393                         break;
1394                 case 11: /* set bell duration in msec */
1395                         if (vc->vc_npar >= 1)
1396                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1397                                         vc->vc_par[1] * HZ / 1000 : 0;
1398                         else
1399                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1400                         break;
1401                 case 12: /* bring specified console to the front */
1402                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1403                                 set_console(vc->vc_par[1] - 1);
1404                         break;
1405                 case 13: /* unblank the screen */
1406                         poke_blanked_console();
1407                         break;
1408                 case 14: /* set vesa powerdown interval */
1409                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1410                         break;
1411                 case 15: /* activate the previous console */
1412                         set_console(last_console);
1413                         break;
1414         }
1415 }
1416
1417 /* console_sem is held */
1418 static void csi_at(struct vc_data *vc, unsigned int nr)
1419 {
1420         if (nr > vc->vc_cols - vc->vc_x)
1421                 nr = vc->vc_cols - vc->vc_x;
1422         else if (!nr)
1423                 nr = 1;
1424         insert_char(vc, nr);
1425 }
1426
1427 /* console_sem is held */
1428 static void csi_L(struct vc_data *vc, unsigned int nr)
1429 {
1430         if (nr > vc->vc_rows - vc->vc_y)
1431                 nr = vc->vc_rows - vc->vc_y;
1432         else if (!nr)
1433                 nr = 1;
1434         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1435         vc->vc_need_wrap = 0;
1436 }
1437
1438 /* console_sem is held */
1439 static void csi_P(struct vc_data *vc, unsigned int nr)
1440 {
1441         if (nr > vc->vc_cols - vc->vc_x)
1442                 nr = vc->vc_cols - vc->vc_x;
1443         else if (!nr)
1444                 nr = 1;
1445         delete_char(vc, nr);
1446 }
1447
1448 /* console_sem is held */
1449 static void csi_M(struct vc_data *vc, unsigned int nr)
1450 {
1451         if (nr > vc->vc_rows - vc->vc_y)
1452                 nr = vc->vc_rows - vc->vc_y;
1453         else if (!nr)
1454                 nr=1;
1455         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1456         vc->vc_need_wrap = 0;
1457 }
1458
1459 /* console_sem is held (except via vc_init->reset_terminal */
1460 static void save_cur(struct vc_data *vc)
1461 {
1462         vc->vc_saved_x          = vc->vc_x;
1463         vc->vc_saved_y          = vc->vc_y;
1464         vc->vc_s_intensity      = vc->vc_intensity;
1465         vc->vc_s_underline      = vc->vc_underline;
1466         vc->vc_s_blink          = vc->vc_blink;
1467         vc->vc_s_reverse        = vc->vc_reverse;
1468         vc->vc_s_charset        = vc->vc_charset;
1469         vc->vc_s_color          = vc->vc_color;
1470         vc->vc_saved_G0         = vc->vc_G0_charset;
1471         vc->vc_saved_G1         = vc->vc_G1_charset;
1472 }
1473
1474 /* console_sem is held */
1475 static void restore_cur(struct vc_data *vc)
1476 {
1477         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1478         vc->vc_intensity        = vc->vc_s_intensity;
1479         vc->vc_underline        = vc->vc_s_underline;
1480         vc->vc_blink            = vc->vc_s_blink;
1481         vc->vc_reverse          = vc->vc_s_reverse;
1482         vc->vc_charset          = vc->vc_s_charset;
1483         vc->vc_color            = vc->vc_s_color;
1484         vc->vc_G0_charset       = vc->vc_saved_G0;
1485         vc->vc_G1_charset       = vc->vc_saved_G1;
1486         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1487         update_attr(vc);
1488         vc->vc_need_wrap = 0;
1489 }
1490
1491 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1492         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1493         ESpalette };
1494
1495 /* console_sem is held (except via vc_init()) */
1496 static void reset_terminal(struct vc_data *vc, int do_clear)
1497 {
1498         vc->vc_top              = 0;
1499         vc->vc_bottom           = vc->vc_rows;
1500         vc->vc_state            = ESnormal;
1501         vc->vc_ques             = 0;
1502         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1503         vc->vc_G0_charset       = LAT1_MAP;
1504         vc->vc_G1_charset       = GRAF_MAP;
1505         vc->vc_charset          = 0;
1506         vc->vc_need_wrap        = 0;
1507         vc->vc_report_mouse     = 0;
1508         vc->vc_utf              = 0;
1509         vc->vc_utf_count        = 0;
1510
1511         vc->vc_disp_ctrl        = 0;
1512         vc->vc_toggle_meta      = 0;
1513
1514         vc->vc_decscnm          = 0;
1515         vc->vc_decom            = 0;
1516         vc->vc_decawm           = 1;
1517         vc->vc_deccm            = 1;
1518         vc->vc_decim            = 0;
1519
1520         set_kbd(vc, decarm);
1521         clr_kbd(vc, decckm);
1522         clr_kbd(vc, kbdapplic);
1523         clr_kbd(vc, lnm);
1524         kbd_table[vc->vc_num].lockstate = 0;
1525         kbd_table[vc->vc_num].slockstate = 0;
1526         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1527         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1528         /* do not do set_leds here because this causes an endless tasklet loop
1529            when the keyboard hasn't been initialized yet */
1530
1531         vc->vc_cursor_type = CUR_DEFAULT;
1532         vc->vc_complement_mask = vc->vc_s_complement_mask;
1533
1534         default_attr(vc);
1535         update_attr(vc);
1536
1537         vc->vc_tab_stop[0]      = 0x01010100;
1538         vc->vc_tab_stop[1]      =
1539         vc->vc_tab_stop[2]      =
1540         vc->vc_tab_stop[3]      =
1541         vc->vc_tab_stop[4]      = 0x01010101;
1542
1543         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1544         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1545
1546         gotoxy(vc, 0, 0);
1547         save_cur(vc);
1548         if (do_clear)
1549             csi_J(vc, 2);
1550 }
1551
1552 /* console_sem is held */
1553 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1554 {
1555         /*
1556          *  Control characters can be used in the _middle_
1557          *  of an escape sequence.
1558          */
1559         switch (c) {
1560         case 0:
1561                 return;
1562         case 7:
1563                 if (vc->vc_bell_duration)
1564                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1565                 return;
1566         case 8:
1567                 bs(vc);
1568                 return;
1569         case 9:
1570                 vc->vc_pos -= (vc->vc_x << 1);
1571                 while (vc->vc_x < vc->vc_cols - 1) {
1572                         vc->vc_x++;
1573                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1574                                 break;
1575                 }
1576                 vc->vc_pos += (vc->vc_x << 1);
1577                 return;
1578         case 10: case 11: case 12:
1579                 lf(vc);
1580                 if (!is_kbd(vc, lnm))
1581                         return;
1582         case 13:
1583                 cr(vc);
1584                 return;
1585         case 14:
1586                 vc->vc_charset = 1;
1587                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1588                 vc->vc_disp_ctrl = 1;
1589                 return;
1590         case 15:
1591                 vc->vc_charset = 0;
1592                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1593                 vc->vc_disp_ctrl = 0;
1594                 return;
1595         case 24: case 26:
1596                 vc->vc_state = ESnormal;
1597                 return;
1598         case 27:
1599                 vc->vc_state = ESesc;
1600                 return;
1601         case 127:
1602                 del(vc);
1603                 return;
1604         case 128+27:
1605                 vc->vc_state = ESsquare;
1606                 return;
1607         }
1608         switch(vc->vc_state) {
1609         case ESesc:
1610                 vc->vc_state = ESnormal;
1611                 switch (c) {
1612                 case '[':
1613                         vc->vc_state = ESsquare;
1614                         return;
1615                 case ']':
1616                         vc->vc_state = ESnonstd;
1617                         return;
1618                 case '%':
1619                         vc->vc_state = ESpercent;
1620                         return;
1621                 case 'E':
1622                         cr(vc);
1623                         lf(vc);
1624                         return;
1625                 case 'M':
1626                         ri(vc);
1627                         return;
1628                 case 'D':
1629                         lf(vc);
1630                         return;
1631                 case 'H':
1632                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1633                         return;
1634                 case 'Z':
1635                         respond_ID(tty);
1636                         return;
1637                 case '7':
1638                         save_cur(vc);
1639                         return;
1640                 case '8':
1641                         restore_cur(vc);
1642                         return;
1643                 case '(':
1644                         vc->vc_state = ESsetG0;
1645                         return;
1646                 case ')':
1647                         vc->vc_state = ESsetG1;
1648                         return;
1649                 case '#':
1650                         vc->vc_state = EShash;
1651                         return;
1652                 case 'c':
1653                         reset_terminal(vc, 1);
1654                         return;
1655                 case '>':  /* Numeric keypad */
1656                         clr_kbd(vc, kbdapplic);
1657                         return;
1658                 case '=':  /* Appl. keypad */
1659                         set_kbd(vc, kbdapplic);
1660                         return;
1661                 }
1662                 return;
1663         case ESnonstd:
1664                 if (c=='P') {   /* palette escape sequence */
1665                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1666                                 vc->vc_par[vc->vc_npar] = 0;
1667                         vc->vc_npar = 0;
1668                         vc->vc_state = ESpalette;
1669                         return;
1670                 } else if (c=='R') {   /* reset palette */
1671                         reset_palette(vc);
1672                         vc->vc_state = ESnormal;
1673                 } else
1674                         vc->vc_state = ESnormal;
1675                 return;
1676         case ESpalette:
1677                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1678                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1679                         if (vc->vc_npar == 7) {
1680                                 int i = vc->vc_par[0] * 3, j = 1;
1681                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1682                                 vc->vc_palette[i++] += vc->vc_par[j++];
1683                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1684                                 vc->vc_palette[i++] += vc->vc_par[j++];
1685                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1686                                 vc->vc_palette[i] += vc->vc_par[j];
1687                                 set_palette(vc);
1688                                 vc->vc_state = ESnormal;
1689                         }
1690                 } else
1691                         vc->vc_state = ESnormal;
1692                 return;
1693         case ESsquare:
1694                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1695                         vc->vc_par[vc->vc_npar] = 0;
1696                 vc->vc_npar = 0;
1697                 vc->vc_state = ESgetpars;
1698                 if (c == '[') { /* Function key */
1699                         vc->vc_state=ESfunckey;
1700                         return;
1701                 }
1702                 vc->vc_ques = (c == '?');
1703                 if (vc->vc_ques)
1704                         return;
1705         case ESgetpars:
1706                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1707                         vc->vc_npar++;
1708                         return;
1709                 } else if (c>='0' && c<='9') {
1710                         vc->vc_par[vc->vc_npar] *= 10;
1711                         vc->vc_par[vc->vc_npar] += c - '0';
1712                         return;
1713                 } else
1714                         vc->vc_state = ESgotpars;
1715         case ESgotpars:
1716                 vc->vc_state = ESnormal;
1717                 switch(c) {
1718                 case 'h':
1719                         set_mode(vc, 1);
1720                         return;
1721                 case 'l':
1722                         set_mode(vc, 0);
1723                         return;
1724                 case 'c':
1725                         if (vc->vc_ques) {
1726                                 if (vc->vc_par[0])
1727                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1728                                 else
1729                                         vc->vc_cursor_type = CUR_DEFAULT;
1730                                 return;
1731                         }
1732                         break;
1733                 case 'm':
1734                         if (vc->vc_ques) {
1735                                 clear_selection();
1736                                 if (vc->vc_par[0])
1737                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1738                                 else
1739                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1740                                 return;
1741                         }
1742                         break;
1743                 case 'n':
1744                         if (!vc->vc_ques) {
1745                                 if (vc->vc_par[0] == 5)
1746                                         status_report(tty);
1747                                 else if (vc->vc_par[0] == 6)
1748                                         cursor_report(vc, tty);
1749                         }
1750                         return;
1751                 }
1752                 if (vc->vc_ques) {
1753                         vc->vc_ques = 0;
1754                         return;
1755                 }
1756                 switch(c) {
1757                 case 'G': case '`':
1758                         if (vc->vc_par[0])
1759                                 vc->vc_par[0]--;
1760                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1761                         return;
1762                 case 'A':
1763                         if (!vc->vc_par[0])
1764                                 vc->vc_par[0]++;
1765                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1766                         return;
1767                 case 'B': case 'e':
1768                         if (!vc->vc_par[0])
1769                                 vc->vc_par[0]++;
1770                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1771                         return;
1772                 case 'C': case 'a':
1773                         if (!vc->vc_par[0])
1774                                 vc->vc_par[0]++;
1775                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1776                         return;
1777                 case 'D':
1778                         if (!vc->vc_par[0])
1779                                 vc->vc_par[0]++;
1780                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1781                         return;
1782                 case 'E':
1783                         if (!vc->vc_par[0])
1784                                 vc->vc_par[0]++;
1785                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1786                         return;
1787                 case 'F':
1788                         if (!vc->vc_par[0])
1789                                 vc->vc_par[0]++;
1790                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1791                         return;
1792                 case 'd':
1793                         if (vc->vc_par[0])
1794                                 vc->vc_par[0]--;
1795                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1796                         return;
1797                 case 'H': case 'f':
1798                         if (vc->vc_par[0])
1799                                 vc->vc_par[0]--;
1800                         if (vc->vc_par[1])
1801                                 vc->vc_par[1]--;
1802                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1803                         return;
1804                 case 'J':
1805                         csi_J(vc, vc->vc_par[0]);
1806                         return;
1807                 case 'K':
1808                         csi_K(vc, vc->vc_par[0]);
1809                         return;
1810                 case 'L':
1811                         csi_L(vc, vc->vc_par[0]);
1812                         return;
1813                 case 'M':
1814                         csi_M(vc, vc->vc_par[0]);
1815                         return;
1816                 case 'P':
1817                         csi_P(vc, vc->vc_par[0]);
1818                         return;
1819                 case 'c':
1820                         if (!vc->vc_par[0])
1821                                 respond_ID(tty);
1822                         return;
1823                 case 'g':
1824                         if (!vc->vc_par[0])
1825                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1826                         else if (vc->vc_par[0] == 3) {
1827                                 vc->vc_tab_stop[0] =
1828                                         vc->vc_tab_stop[1] =
1829                                         vc->vc_tab_stop[2] =
1830                                         vc->vc_tab_stop[3] =
1831                                         vc->vc_tab_stop[4] = 0;
1832                         }
1833                         return;
1834                 case 'm':
1835                         csi_m(vc);
1836                         return;
1837                 case 'q': /* DECLL - but only 3 leds */
1838                         /* map 0,1,2,3 to 0,1,2,4 */
1839                         if (vc->vc_par[0] < 4)
1840                                 setledstate(kbd_table + vc->vc_num,
1841                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1842                         return;
1843                 case 'r':
1844                         if (!vc->vc_par[0])
1845                                 vc->vc_par[0]++;
1846                         if (!vc->vc_par[1])
1847                                 vc->vc_par[1] = vc->vc_rows;
1848                         /* Minimum allowed region is 2 lines */
1849                         if (vc->vc_par[0] < vc->vc_par[1] &&
1850                             vc->vc_par[1] <= vc->vc_rows) {
1851                                 vc->vc_top = vc->vc_par[0] - 1;
1852                                 vc->vc_bottom = vc->vc_par[1];
1853                                 gotoxay(vc, 0, 0);
1854                         }
1855                         return;
1856                 case 's':
1857                         save_cur(vc);
1858                         return;
1859                 case 'u':
1860                         restore_cur(vc);
1861                         return;
1862                 case 'X':
1863                         csi_X(vc, vc->vc_par[0]);
1864                         return;
1865                 case '@':
1866                         csi_at(vc, vc->vc_par[0]);
1867                         return;
1868                 case ']': /* setterm functions */
1869                         setterm_command(vc);
1870                         return;
1871                 }
1872                 return;
1873         case ESpercent:
1874                 vc->vc_state = ESnormal;
1875                 switch (c) {
1876                 case '@':  /* defined in ISO 2022 */
1877                         vc->vc_utf = 0;
1878                         return;
1879                 case 'G':  /* prelim official escape code */
1880                 case '8':  /* retained for compatibility */
1881                         vc->vc_utf = 1;
1882                         return;
1883                 }
1884                 return;
1885         case ESfunckey:
1886                 vc->vc_state = ESnormal;
1887                 return;
1888         case EShash:
1889                 vc->vc_state = ESnormal;
1890                 if (c == '8') {
1891                         /* DEC screen alignment test. kludge :-) */
1892                         vc->vc_video_erase_char =
1893                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1894                         csi_J(vc, 2);
1895                         vc->vc_video_erase_char =
1896                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1897                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1898                 }
1899                 return;
1900         case ESsetG0:
1901                 if (c == '0')
1902                         vc->vc_G0_charset = GRAF_MAP;
1903                 else if (c == 'B')
1904                         vc->vc_G0_charset = LAT1_MAP;
1905                 else if (c == 'U')
1906                         vc->vc_G0_charset = IBMPC_MAP;
1907                 else if (c == 'K')
1908                         vc->vc_G0_charset = USER_MAP;
1909                 if (vc->vc_charset == 0)
1910                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1911                 vc->vc_state = ESnormal;
1912                 return;
1913         case ESsetG1:
1914                 if (c == '0')
1915                         vc->vc_G1_charset = GRAF_MAP;
1916                 else if (c == 'B')
1917                         vc->vc_G1_charset = LAT1_MAP;
1918                 else if (c == 'U')
1919                         vc->vc_G1_charset = IBMPC_MAP;
1920                 else if (c == 'K')
1921                         vc->vc_G1_charset = USER_MAP;
1922                 if (vc->vc_charset == 1)
1923                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1924                 vc->vc_state = ESnormal;
1925                 return;
1926         default:
1927                 vc->vc_state = ESnormal;
1928         }
1929 }
1930
1931 /* This is a temporary buffer used to prepare a tty console write
1932  * so that we can easily avoid touching user space while holding the
1933  * console spinlock.  It is allocated in con_init and is shared by
1934  * this code and the vc_screen read/write tty calls.
1935  *
1936  * We have to allocate this statically in the kernel data section
1937  * since console_init (and thus con_init) are called before any
1938  * kernel memory allocation is available.
1939  */
1940 char con_buf[CON_BUF_SIZE];
1941 DECLARE_MUTEX(con_buf_sem);
1942
1943 /* acquires console_sem */
1944 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1945 {
1946 #ifdef VT_BUF_VRAM_ONLY
1947 #define FLUSH do { } while(0);
1948 #else
1949 #define FLUSH if (draw_x >= 0) { \
1950         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1951         draw_x = -1; \
1952         }
1953 #endif
1954
1955         int c, tc, ok, n = 0, draw_x = -1;
1956         unsigned int currcons;
1957         unsigned long draw_from = 0, draw_to = 0;
1958         struct vc_data *vc;
1959         u16 himask, charmask;
1960         const unsigned char *orig_buf = NULL;
1961         int orig_count;
1962
1963         if (in_interrupt())
1964                 return count;
1965
1966         might_sleep();
1967
1968         acquire_console_sem();
1969         vc = tty->driver_data;
1970         if (vc == NULL) {
1971                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1972                 release_console_sem();
1973                 return 0;
1974         }
1975
1976         currcons = vc->vc_num;
1977         if (!vc_cons_allocated(currcons)) {
1978             /* could this happen? */
1979             static int error = 0;
1980             if (!error) {
1981                 error = 1;
1982                 printk("con_write: tty %d not allocated\n", currcons+1);
1983             }
1984             release_console_sem();
1985             return 0;
1986         }
1987         release_console_sem();
1988
1989         orig_buf = buf;
1990         orig_count = count;
1991
1992         /* At this point 'buf' is guaranteed to be a kernel buffer
1993          * and therefore no access to userspace (and therefore sleeping)
1994          * will be needed.  The con_buf_sem serializes all tty based
1995          * console rendering and vcs write/read operations.  We hold
1996          * the console spinlock during the entire write.
1997          */
1998
1999         acquire_console_sem();
2000
2001         vc = tty->driver_data;
2002         if (vc == NULL) {
2003                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2004                 release_console_sem();
2005                 goto out;
2006         }
2007
2008         himask = vc->vc_hi_font_mask;
2009         charmask = himask ? 0x1ff : 0xff;
2010
2011         /* undraw cursor first */
2012         if (IS_FG(vc))
2013                 hide_cursor(vc);
2014
2015         while (!tty->stopped && count) {
2016                 int orig = *buf;
2017                 c = orig;
2018                 buf++;
2019                 n++;
2020                 count--;
2021
2022                 /* Do no translation at all in control states */
2023                 if (vc->vc_state != ESnormal) {
2024                         tc = c;
2025                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2026                     /* Combine UTF-8 into Unicode */
2027                     /* Malformed sequences as sequences of replacement glyphs */
2028 rescan_last_byte:
2029                     if(c > 0x7f) {
2030                         if (vc->vc_utf_count) {
2031                                if ((c & 0xc0) == 0x80) {
2032                                        vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2033                                        if (--vc->vc_utf_count) {
2034                                                vc->vc_npar++;
2035                                                continue;
2036                                        }
2037                                        tc = c = vc->vc_utf_char;
2038                                } else
2039                                        goto replacement_glyph;
2040                         } else {
2041                                 vc->vc_npar = 0;
2042                                 if ((c & 0xe0) == 0xc0) {
2043                                     vc->vc_utf_count = 1;
2044                                     vc->vc_utf_char = (c & 0x1f);
2045                                 } else if ((c & 0xf0) == 0xe0) {
2046                                     vc->vc_utf_count = 2;
2047                                     vc->vc_utf_char = (c & 0x0f);
2048                                 } else if ((c & 0xf8) == 0xf0) {
2049                                     vc->vc_utf_count = 3;
2050                                     vc->vc_utf_char = (c & 0x07);
2051                                 } else if ((c & 0xfc) == 0xf8) {
2052                                     vc->vc_utf_count = 4;
2053                                     vc->vc_utf_char = (c & 0x03);
2054                                 } else if ((c & 0xfe) == 0xfc) {
2055                                     vc->vc_utf_count = 5;
2056                                     vc->vc_utf_char = (c & 0x01);
2057                                 } else
2058                                     goto replacement_glyph;
2059                                 continue;
2060                               }
2061                     } else {
2062                       if (vc->vc_utf_count)
2063                               goto replacement_glyph;
2064                       tc = c;
2065                     }
2066                 } else {        /* no utf or alternate charset mode */
2067                   tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2068                 }
2069
2070                 /* If the original code was a control character we
2071                  * only allow a glyph to be displayed if the code is
2072                  * not normally used (such as for cursor movement) or
2073                  * if the disp_ctrl mode has been explicitly enabled.
2074                  * Certain characters (as given by the CTRL_ALWAYS
2075                  * bitmap) are always displayed as control characters,
2076                  * as the console would be pretty useless without
2077                  * them; to display an arbitrary font position use the
2078                  * direct-to-font zone in UTF-8 mode.
2079                  */
2080                 ok = tc && (c >= 32 ||
2081                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2082                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2083                         && (c != 127 || vc->vc_disp_ctrl)
2084                         && (c != 128+27);
2085
2086                 if (vc->vc_state == ESnormal && ok) {
2087                         /* Now try to find out how to display it */
2088                         tc = conv_uni_to_pc(vc, tc);
2089                         if (tc & ~charmask) {
2090                                 if ( tc == -4 ) {
2091                                 /* If we got -4 (not found) then see if we have
2092                                    defined a replacement character (U+FFFD) */
2093 replacement_glyph:
2094                                         tc = conv_uni_to_pc(vc, 0xfffd);
2095                                         if (!(tc & ~charmask))
2096                                                 goto display_glyph;
2097                                 } else if ( tc != -3 )
2098                                         continue; /* nothing to display */
2099                                 /* no hash table or no replacement --
2100                                  * hope for the best */
2101                                 if ( c & ~charmask )
2102                                         tc = '?';
2103                                 else
2104                                         tc = c;
2105                         }
2106
2107 display_glyph:
2108                         if (vc->vc_need_wrap || vc->vc_decim)
2109                                 FLUSH
2110                         if (vc->vc_need_wrap) {
2111                                 cr(vc);
2112                                 lf(vc);
2113                         }
2114                         if (vc->vc_decim)
2115                                 insert_char(vc, 1);
2116                         scr_writew(himask ?
2117                                      ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2118                                      (vc->vc_attr << 8) + tc,
2119                                    (u16 *) vc->vc_pos);
2120                         if (DO_UPDATE(vc) && draw_x < 0) {
2121                                 draw_x = vc->vc_x;
2122                                 draw_from = vc->vc_pos;
2123                         }
2124                         if (vc->vc_x == vc->vc_cols - 1) {
2125                                 vc->vc_need_wrap = vc->vc_decawm;
2126                                 draw_to = vc->vc_pos + 2;
2127                         } else {
2128                                 vc->vc_x++;
2129                                 draw_to = (vc->vc_pos += 2);
2130                         }
2131                         if (vc->vc_utf_count) {
2132                                 if (vc->vc_npar) {
2133                                         vc->vc_npar--;
2134                                         goto display_glyph;
2135                                 }
2136                                 vc->vc_utf_count = 0;
2137                                 c = orig;
2138                                 goto rescan_last_byte;
2139                         }
2140                         continue;
2141                 }
2142                 FLUSH
2143                 do_con_trol(tty, vc, orig);
2144         }
2145         FLUSH
2146         console_conditional_schedule();
2147         release_console_sem();
2148
2149 out:
2150         return n;
2151 #undef FLUSH
2152 }
2153
2154 /*
2155  * This is the console switching callback.
2156  *
2157  * Doing console switching in a process context allows
2158  * us to do the switches asynchronously (needed when we want
2159  * to switch due to a keyboard interrupt).  Synchronization
2160  * with other console code and prevention of re-entrancy is
2161  * ensured with console_sem.
2162  */
2163 static void console_callback(void *ignored)
2164 {
2165         acquire_console_sem();
2166
2167         if (want_console >= 0) {
2168                 if (want_console != fg_console &&
2169                     vc_cons_allocated(want_console)) {
2170                         hide_cursor(vc_cons[fg_console].d);
2171                         change_console(vc_cons[want_console].d);
2172                         /* we only changed when the console had already
2173                            been allocated - a new console is not created
2174                            in an interrupt routine */
2175                 }
2176                 want_console = -1;
2177         }
2178         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2179                 do_poke_blanked_console = 0;
2180                 poke_blanked_console();
2181         }
2182         if (scrollback_delta) {
2183                 struct vc_data *vc = vc_cons[fg_console].d;
2184                 clear_selection();
2185                 if (vc->vc_mode == KD_TEXT)
2186                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2187                 scrollback_delta = 0;
2188         }
2189         if (blank_timer_expired) {
2190                 do_blank_screen(0);
2191                 blank_timer_expired = 0;
2192         }
2193
2194         release_console_sem();
2195 }
2196
2197 void set_console(int nr)
2198 {
2199         want_console = nr;
2200         schedule_console_callback();
2201 }
2202
2203 struct tty_driver *console_driver;
2204
2205 #ifdef CONFIG_VT_CONSOLE
2206
2207 /*
2208  *      Console on virtual terminal
2209  *
2210  * The console must be locked when we get here.
2211  */
2212
2213 static void vt_console_print(struct console *co, const char *b, unsigned count)
2214 {
2215         struct vc_data *vc = vc_cons[fg_console].d;
2216         unsigned char c;
2217         static unsigned long printing;
2218         const ushort *start;
2219         ushort cnt = 0;
2220         ushort myx;
2221
2222         /* console busy or not yet initialized */
2223         if (!printable || test_and_set_bit(0, &printing))
2224                 return;
2225
2226         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2227                 vc = vc_cons[kmsg_redirect - 1].d;
2228
2229         /* read `x' only after setting currcons properly (otherwise
2230            the `x' macro will read the x of the foreground console). */
2231         myx = vc->vc_x;
2232
2233         if (!vc_cons_allocated(fg_console)) {
2234                 /* impossible */
2235                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2236                 goto quit;
2237         }
2238
2239         if (vc->vc_mode != KD_TEXT)
2240                 goto quit;
2241
2242         /* undraw cursor first */
2243         if (IS_FG(vc))
2244                 hide_cursor(vc);
2245
2246         start = (ushort *)vc->vc_pos;
2247
2248         /* Contrived structure to try to emulate original need_wrap behaviour
2249          * Problems caused when we have need_wrap set on '\n' character */
2250         while (count--) {
2251                 c = *b++;
2252                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2253                         if (cnt > 0) {
2254                                 if (CON_IS_VISIBLE(vc))
2255                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2256                                 vc->vc_x += cnt;
2257                                 if (vc->vc_need_wrap)
2258                                         vc->vc_x--;
2259                                 cnt = 0;
2260                         }
2261                         if (c == 8) {           /* backspace */
2262                                 bs(vc);
2263                                 start = (ushort *)vc->vc_pos;
2264                                 myx = vc->vc_x;
2265                                 continue;
2266                         }
2267                         if (c != 13)
2268                                 lf(vc);
2269                         cr(vc);
2270                         start = (ushort *)vc->vc_pos;
2271                         myx = vc->vc_x;
2272                         if (c == 10 || c == 13)
2273                                 continue;
2274                 }
2275                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2276                 cnt++;
2277                 if (myx == vc->vc_cols - 1) {
2278                         vc->vc_need_wrap = 1;
2279                         continue;
2280                 }
2281                 vc->vc_pos += 2;
2282                 myx++;
2283         }
2284         if (cnt > 0) {
2285                 if (CON_IS_VISIBLE(vc))
2286                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2287                 vc->vc_x += cnt;
2288                 if (vc->vc_x == vc->vc_cols) {
2289                         vc->vc_x--;
2290                         vc->vc_need_wrap = 1;
2291                 }
2292         }
2293         set_cursor(vc);
2294
2295 quit:
2296         clear_bit(0, &printing);
2297 }
2298
2299 static struct tty_driver *vt_console_device(struct console *c, int *index)
2300 {
2301         *index = c->index ? c->index-1 : fg_console;
2302         return console_driver;
2303 }
2304
2305 static struct console vt_console_driver = {
2306         .name           = "tty",
2307         .write          = vt_console_print,
2308         .device         = vt_console_device,
2309         .unblank        = unblank_screen,
2310         .flags          = CON_PRINTBUFFER,
2311         .index          = -1,
2312 };
2313 #endif
2314
2315 /*
2316  *      Handling of Linux-specific VC ioctls
2317  */
2318
2319 /*
2320  * Generally a bit racy with respect to console_sem().
2321  *
2322  * There are some functions which don't need it.
2323  *
2324  * There are some functions which can sleep for arbitrary periods
2325  * (paste_selection) but we don't need the lock there anyway.
2326  *
2327  * set_selection has locking, and definitely needs it
2328  */
2329
2330 int tioclinux(struct tty_struct *tty, unsigned long arg)
2331 {
2332         char type, data;
2333         char __user *p = (char __user *)arg;
2334         int lines;
2335         int ret;
2336
2337         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2338                 return -EINVAL;
2339         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2340                 return -EPERM;
2341         if (get_user(type, p))
2342                 return -EFAULT;
2343         ret = 0;
2344         switch (type)
2345         {
2346                 case TIOCL_SETSEL:
2347                         acquire_console_sem();
2348                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2349                         release_console_sem();
2350                         break;
2351                 case TIOCL_PASTESEL:
2352                         ret = paste_selection(tty);
2353                         break;
2354                 case TIOCL_UNBLANKSCREEN:
2355                         acquire_console_sem();
2356                         unblank_screen();
2357                         release_console_sem();
2358                         break;
2359                 case TIOCL_SELLOADLUT:
2360                         ret = sel_loadlut(p);
2361                         break;
2362                 case TIOCL_GETSHIFTSTATE:
2363
2364         /*
2365          * Make it possible to react to Shift+Mousebutton.
2366          * Note that 'shift_state' is an undocumented
2367          * kernel-internal variable; programs not closely
2368          * related to the kernel should not use this.
2369          */
2370                         data = shift_state;
2371                         ret = __put_user(data, p);
2372                         break;
2373                 case TIOCL_GETMOUSEREPORTING:
2374                         data = mouse_reporting();
2375                         ret = __put_user(data, p);
2376                         break;
2377                 case TIOCL_SETVESABLANK:
2378                         set_vesa_blanking(p);
2379                         break;
2380                 case TIOCL_GETKMSGREDIRECT:
2381                         data = kmsg_redirect;
2382                         ret = __put_user(data, p);
2383                         break;
2384                 case TIOCL_SETKMSGREDIRECT:
2385                         if (!capable(CAP_SYS_ADMIN)) {
2386                                 ret = -EPERM;
2387                         } else {
2388                                 if (get_user(data, p+1))
2389                                         ret = -EFAULT;
2390                                 else
2391                                         kmsg_redirect = data;
2392                         }
2393                         break;
2394                 case TIOCL_GETFGCONSOLE:
2395                         ret = fg_console;
2396                         break;
2397                 case TIOCL_SCROLLCONSOLE:
2398                         if (get_user(lines, (s32 __user *)(p+4))) {
2399                                 ret = -EFAULT;
2400                         } else {
2401                                 scrollfront(vc_cons[fg_console].d, lines);
2402                                 ret = 0;
2403                         }
2404                         break;
2405                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2406                         acquire_console_sem();
2407                         ignore_poke = 1;
2408                         do_blank_screen(0);
2409                         release_console_sem();
2410                         break;
2411                 case TIOCL_BLANKEDSCREEN:
2412                         ret = console_blanked;
2413                         break;
2414                 default:
2415                         ret = -EINVAL;
2416                         break;
2417         }
2418         return ret;
2419 }
2420
2421 /*
2422  * /dev/ttyN handling
2423  */
2424
2425 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2426 {
2427         int     retval;
2428
2429         retval = do_con_write(tty, buf, count);
2430         con_flush_chars(tty);
2431
2432         return retval;
2433 }
2434
2435 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2436 {
2437         if (in_interrupt())
2438                 return; /* n_r3964 calls put_char() from interrupt context */
2439         do_con_write(tty, &ch, 1);
2440 }
2441
2442 static int con_write_room(struct tty_struct *tty)
2443 {
2444         if (tty->stopped)
2445                 return 0;
2446         return 4096;            /* No limit, really; we're not buffering */
2447 }
2448
2449 static int con_chars_in_buffer(struct tty_struct *tty)
2450 {
2451         return 0;               /* we're not buffering */
2452 }
2453
2454 /*
2455  * con_throttle and con_unthrottle are only used for
2456  * paste_selection(), which has to stuff in a large number of
2457  * characters...
2458  */
2459 static void con_throttle(struct tty_struct *tty)
2460 {
2461 }
2462
2463 static void con_unthrottle(struct tty_struct *tty)
2464 {
2465         struct vc_data *vc = tty->driver_data;
2466
2467         wake_up_interruptible(&vc->paste_wait);
2468 }
2469
2470 /*
2471  * Turn the Scroll-Lock LED on when the tty is stopped
2472  */
2473 static void con_stop(struct tty_struct *tty)
2474 {
2475         int console_num;
2476         if (!tty)
2477                 return;
2478         console_num = tty->index;
2479         if (!vc_cons_allocated(console_num))
2480                 return;
2481         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2482         set_leds();
2483 }
2484
2485 /*
2486  * Turn the Scroll-Lock LED off when the console is started
2487  */
2488 static void con_start(struct tty_struct *tty)
2489 {
2490         int console_num;
2491         if (!tty)
2492                 return;
2493         console_num = tty->index;
2494         if (!vc_cons_allocated(console_num))
2495                 return;
2496         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2497         set_leds();
2498 }
2499
2500 static void con_flush_chars(struct tty_struct *tty)
2501 {
2502         struct vc_data *vc;
2503
2504         if (in_interrupt())     /* from flush_to_ldisc */
2505                 return;
2506
2507         /* if we race with con_close(), vt may be null */
2508         acquire_console_sem();
2509         vc = tty->driver_data;
2510         if (vc)
2511                 set_cursor(vc);
2512         release_console_sem();
2513 }
2514
2515 /*
2516  * Allocate the console screen memory.
2517  */
2518 static int con_open(struct tty_struct *tty, struct file *filp)
2519 {
2520         unsigned int currcons = tty->index;
2521         int ret = 0;
2522
2523         acquire_console_sem();
2524         if (tty->driver_data == NULL) {
2525                 ret = vc_allocate(currcons);
2526                 if (ret == 0) {
2527                         struct vc_data *vc = vc_cons[currcons].d;
2528                         tty->driver_data = vc;
2529                         vc->vc_tty = tty;
2530
2531                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2532                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2533                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2534                         }
2535                         release_console_sem();
2536                         vcs_make_sysfs(tty);
2537                         return ret;
2538                 }
2539         }
2540         release_console_sem();
2541         return ret;
2542 }
2543
2544 /*
2545  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2546  * and taking a ref against the tty while we're in the process of forgetting
2547  * about it and cleaning things up.
2548  *
2549  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2550  */
2551 static void con_close(struct tty_struct *tty, struct file *filp)
2552 {
2553         mutex_lock(&tty_mutex);
2554         acquire_console_sem();
2555         if (tty && tty->count == 1) {
2556                 struct vc_data *vc = tty->driver_data;
2557
2558                 if (vc)
2559                         vc->vc_tty = NULL;
2560                 tty->driver_data = NULL;
2561                 release_console_sem();
2562                 vcs_remove_sysfs(tty);
2563                 mutex_unlock(&tty_mutex);
2564                 /*
2565                  * tty_mutex is released, but we still hold BKL, so there is
2566                  * still exclusion against init_dev()
2567                  */
2568                 return;
2569         }
2570         release_console_sem();
2571         mutex_unlock(&tty_mutex);
2572 }
2573
2574 static void vc_init(struct vc_data *vc, unsigned int rows,
2575                     unsigned int cols, int do_clear)
2576 {
2577         int j, k ;
2578
2579         vc->vc_cols = cols;
2580         vc->vc_rows = rows;
2581         vc->vc_size_row = cols << 1;
2582         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2583
2584         set_origin(vc);
2585         vc->vc_pos = vc->vc_origin;
2586         reset_vc(vc);
2587         for (j=k=0; j<16; j++) {
2588                 vc->vc_palette[k++] = default_red[j] ;
2589                 vc->vc_palette[k++] = default_grn[j] ;
2590                 vc->vc_palette[k++] = default_blu[j] ;
2591         }
2592         vc->vc_def_color       = 0x07;   /* white */
2593         vc->vc_ulcolor          = 0x0f;   /* bold white */
2594         vc->vc_halfcolor       = 0x08;   /* grey */
2595         init_waitqueue_head(&vc->paste_wait);
2596         reset_terminal(vc, do_clear);
2597 }
2598
2599 /*
2600  * This routine initializes console interrupts, and does nothing
2601  * else. If you want the screen to clear, call tty_write with
2602  * the appropriate escape-sequence.
2603  */
2604
2605 static int __init con_init(void)
2606 {
2607         const char *display_desc = NULL;
2608         struct vc_data *vc;
2609         unsigned int currcons = 0, i;
2610
2611         acquire_console_sem();
2612
2613         if (conswitchp)
2614                 display_desc = conswitchp->con_startup();
2615         if (!display_desc) {
2616                 fg_console = 0;
2617                 release_console_sem();
2618                 return 0;
2619         }
2620
2621         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2622                 struct con_driver *con_driver = &registered_con_driver[i];
2623
2624                 if (con_driver->con == NULL) {
2625                         con_driver->con = conswitchp;
2626                         con_driver->desc = display_desc;
2627                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2628                         con_driver->first = 0;
2629                         con_driver->last = MAX_NR_CONSOLES - 1;
2630                         break;
2631                 }
2632         }
2633
2634         for (i = 0; i < MAX_NR_CONSOLES; i++)
2635                 con_driver_map[i] = conswitchp;
2636
2637         init_timer(&console_timer);
2638         console_timer.function = blank_screen_t;
2639         if (blankinterval) {
2640                 blank_state = blank_normal_wait;
2641                 mod_timer(&console_timer, jiffies + blankinterval);
2642         }
2643
2644         /*
2645          * kmalloc is not running yet - we use the bootmem allocator.
2646          */
2647         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2648                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2649                 visual_init(vc, currcons, 1);
2650                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2651                 vc->vc_kmalloced = 0;
2652                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2653                         currcons || !vc->vc_sw->con_save_screen);
2654         }
2655         currcons = fg_console = 0;
2656         master_display_fg = vc = vc_cons[currcons].d;
2657         set_origin(vc);
2658         save_screen(vc);
2659         gotoxy(vc, vc->vc_x, vc->vc_y);
2660         csi_J(vc, 0);
2661         update_screen(vc);
2662         printk("Console: %s %s %dx%d",
2663                 vc->vc_can_do_color ? "colour" : "mono",
2664                 display_desc, vc->vc_cols, vc->vc_rows);
2665         printable = 1;
2666         printk("\n");
2667
2668         release_console_sem();
2669
2670 #ifdef CONFIG_VT_CONSOLE
2671         register_console(&vt_console_driver);
2672 #endif
2673         return 0;
2674 }
2675 console_initcall(con_init);
2676
2677 static struct tty_operations con_ops = {
2678         .open = con_open,
2679         .close = con_close,
2680         .write = con_write,
2681         .write_room = con_write_room,
2682         .put_char = con_put_char,
2683         .flush_chars = con_flush_chars,
2684         .chars_in_buffer = con_chars_in_buffer,
2685         .ioctl = vt_ioctl,
2686         .stop = con_stop,
2687         .start = con_start,
2688         .throttle = con_throttle,
2689         .unthrottle = con_unthrottle,
2690 };
2691
2692 int __init vty_init(void)
2693 {
2694         vcs_init();
2695
2696         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2697         if (!console_driver)
2698                 panic("Couldn't allocate console driver\n");
2699         console_driver->owner = THIS_MODULE;
2700         console_driver->name = "tty";
2701         console_driver->name_base = 1;
2702         console_driver->major = TTY_MAJOR;
2703         console_driver->minor_start = 1;
2704         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2705         console_driver->init_termios = tty_std_termios;
2706         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2707         tty_set_operations(console_driver, &con_ops);
2708         if (tty_register_driver(console_driver))
2709                 panic("Couldn't register console driver\n");
2710
2711         kbd_init();
2712         console_map_init();
2713 #ifdef CONFIG_PROM_CONSOLE
2714         prom_con_init();
2715 #endif
2716 #ifdef CONFIG_MDA_CONSOLE
2717         mda_console_init();
2718 #endif
2719         return 0;
2720 }
2721
2722 #ifndef VT_SINGLE_DRIVER
2723 #include <linux/device.h>
2724
2725 static struct class *vtconsole_class;
2726
2727 static int bind_con_driver(const struct consw *csw, int first, int last,
2728                            int deflt)
2729 {
2730         struct module *owner = csw->owner;
2731         const char *desc = NULL;
2732         struct con_driver *con_driver;
2733         int i, j = -1, k = -1, retval = -ENODEV;
2734
2735         if (!try_module_get(owner))
2736                 return -ENODEV;
2737
2738         acquire_console_sem();
2739
2740         /* check if driver is registered */
2741         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2742                 con_driver = &registered_con_driver[i];
2743
2744                 if (con_driver->con == csw) {
2745                         desc = con_driver->desc;
2746                         retval = 0;
2747                         break;
2748                 }
2749         }
2750
2751         if (retval)
2752                 goto err;
2753
2754         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2755                 csw->con_startup();
2756                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2757         }
2758
2759         if (deflt) {
2760                 if (conswitchp)
2761                         module_put(conswitchp->owner);
2762
2763                 __module_get(owner);
2764                 conswitchp = csw;
2765         }
2766
2767         first = max(first, con_driver->first);
2768         last = min(last, con_driver->last);
2769
2770         for (i = first; i <= last; i++) {
2771                 int old_was_color;
2772                 struct vc_data *vc = vc_cons[i].d;
2773
2774                 if (con_driver_map[i])
2775                         module_put(con_driver_map[i]->owner);
2776                 __module_get(owner);
2777                 con_driver_map[i] = csw;
2778
2779                 if (!vc || !vc->vc_sw)
2780                         continue;
2781
2782                 j = i;
2783
2784                 if (CON_IS_VISIBLE(vc)) {
2785                         k = i;
2786                         save_screen(vc);
2787                 }
2788
2789                 old_was_color = vc->vc_can_do_color;
2790                 vc->vc_sw->con_deinit(vc);
2791                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2792                 visual_init(vc, i, 0);
2793                 set_origin(vc);
2794                 update_attr(vc);
2795
2796                 /* If the console changed between mono <-> color, then
2797                  * the attributes in the screenbuf will be wrong.  The
2798                  * following resets all attributes to something sane.
2799                  */
2800                 if (old_was_color != vc->vc_can_do_color)
2801                         clear_buffer_attributes(vc);
2802         }
2803
2804         printk("Console: switching ");
2805         if (!deflt)
2806                 printk("consoles %d-%d ", first+1, last+1);
2807         if (j >= 0) {
2808                 struct vc_data *vc = vc_cons[j].d;
2809
2810                 printk("to %s %s %dx%d\n",
2811                        vc->vc_can_do_color ? "colour" : "mono",
2812                        desc, vc->vc_cols, vc->vc_rows);
2813
2814                 if (k >= 0) {
2815                         vc = vc_cons[k].d;
2816                         update_screen(vc);
2817                 }
2818         } else
2819                 printk("to %s\n", desc);
2820
2821         retval = 0;
2822 err:
2823         release_console_sem();
2824         module_put(owner);
2825         return retval;
2826 };
2827
2828 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2829 static int con_is_graphics(const struct consw *csw, int first, int last)
2830 {
2831         int i, retval = 0;
2832
2833         for (i = first; i <= last; i++) {
2834                 struct vc_data *vc = vc_cons[i].d;
2835
2836                 if (vc && vc->vc_mode == KD_GRAPHICS) {
2837                         retval = 1;
2838                         break;
2839                 }
2840         }
2841
2842         return retval;
2843 }
2844
2845 static int unbind_con_driver(const struct consw *csw, int first, int last,
2846                              int deflt)
2847 {
2848         struct module *owner = csw->owner;
2849         const struct consw *defcsw = NULL;
2850         struct con_driver *con_driver = NULL, *con_back = NULL;
2851         int i, retval = -ENODEV;
2852
2853         if (!try_module_get(owner))
2854                 return -ENODEV;
2855
2856         acquire_console_sem();
2857
2858         /* check if driver is registered and if it is unbindable */
2859         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2860                 con_driver = &registered_con_driver[i];
2861
2862                 if (con_driver->con == csw &&
2863                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
2864                         retval = 0;
2865                         break;
2866                 }
2867         }
2868
2869         if (retval) {
2870                 release_console_sem();
2871                 goto err;
2872         }
2873
2874         retval = -ENODEV;
2875
2876         /* check if backup driver exists */
2877         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2878                 con_back = &registered_con_driver[i];
2879
2880                 if (con_back->con &&
2881                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
2882                         defcsw = con_back->con;
2883                         retval = 0;
2884                         break;
2885                 }
2886         }
2887
2888         if (retval) {
2889                 release_console_sem();
2890                 goto err;
2891         }
2892
2893         if (!con_is_bound(csw)) {
2894                 release_console_sem();
2895                 goto err;
2896         }
2897
2898         first = max(first, con_driver->first);
2899         last = min(last, con_driver->last);
2900
2901         for (i = first; i <= last; i++) {
2902                 if (con_driver_map[i] == csw) {
2903                         module_put(csw->owner);
2904                         con_driver_map[i] = NULL;
2905                 }
2906         }
2907
2908         if (!con_is_bound(defcsw)) {
2909                 const struct consw *defconsw = conswitchp;
2910
2911                 defcsw->con_startup();
2912                 con_back->flag |= CON_DRIVER_FLAG_INIT;
2913                 /*
2914                  * vgacon may change the default driver to point
2915                  * to dummycon, we restore it here...
2916                  */
2917                 conswitchp = defconsw;
2918         }
2919
2920         if (!con_is_bound(csw))
2921                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
2922
2923         release_console_sem();
2924         /* ignore return value, binding should not fail */
2925         bind_con_driver(defcsw, first, last, deflt);
2926 err:
2927         module_put(owner);
2928         return retval;
2929
2930 }
2931
2932 static int vt_bind(struct con_driver *con)
2933 {
2934         const struct consw *defcsw = NULL, *csw = NULL;
2935         int i, more = 1, first = -1, last = -1, deflt = 0;
2936
2937         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2938             con_is_graphics(con->con, con->first, con->last))
2939                 goto err;
2940
2941         csw = con->con;
2942
2943         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2944                 struct con_driver *con = &registered_con_driver[i];
2945
2946                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
2947                         defcsw = con->con;
2948                         break;
2949                 }
2950         }
2951
2952         if (!defcsw)
2953                 goto err;
2954
2955         while (more) {
2956                 more = 0;
2957
2958                 for (i = con->first; i <= con->last; i++) {
2959                         if (con_driver_map[i] == defcsw) {
2960                                 if (first == -1)
2961                                         first = i;
2962                                 last = i;
2963                                 more = 1;
2964                         } else if (first != -1)
2965                                 break;
2966                 }
2967
2968                 if (first == 0 && last == MAX_NR_CONSOLES -1)
2969                         deflt = 1;
2970
2971                 if (first != -1)
2972                         bind_con_driver(csw, first, last, deflt);
2973
2974                 first = -1;
2975                 last = -1;
2976                 deflt = 0;
2977         }
2978
2979 err:
2980         return 0;
2981 }
2982
2983 static int vt_unbind(struct con_driver *con)
2984 {
2985         const struct consw *csw = NULL;
2986         int i, more = 1, first = -1, last = -1, deflt = 0;
2987
2988         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2989             con_is_graphics(con->con, con->first, con->last))
2990                 goto err;
2991
2992         csw = con->con;
2993
2994         while (more) {
2995                 more = 0;
2996
2997                 for (i = con->first; i <= con->last; i++) {
2998                         if (con_driver_map[i] == csw) {
2999                                 if (first == -1)
3000                                         first = i;
3001                                 last = i;
3002                                 more = 1;
3003                         } else if (first != -1)
3004                                 break;
3005                 }
3006
3007                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3008                         deflt = 1;
3009
3010                 if (first != -1)
3011                         unbind_con_driver(csw, first, last, deflt);
3012
3013                 first = -1;
3014                 last = -1;
3015                 deflt = 0;
3016         }
3017
3018 err:
3019         return 0;
3020 }
3021 #else
3022 static inline int vt_bind(struct con_driver *con)
3023 {
3024         return 0;
3025 }
3026 static inline int vt_unbind(struct con_driver *con)
3027 {
3028         return 0;
3029 }
3030 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3031
3032 static ssize_t store_bind(struct class_device *class_device,
3033                           const char *buf, size_t count)
3034 {
3035         struct con_driver *con = class_get_devdata(class_device);
3036         int bind = simple_strtoul(buf, NULL, 0);
3037
3038         if (bind)
3039                 vt_bind(con);
3040         else
3041                 vt_unbind(con);
3042
3043         return count;
3044 }
3045
3046 static ssize_t show_bind(struct class_device *class_device, char *buf)
3047 {
3048         struct con_driver *con = class_get_devdata(class_device);
3049         int bind = con_is_bound(con->con);
3050
3051         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3052 }
3053
3054 static ssize_t show_name(struct class_device *class_device, char *buf)
3055 {
3056         struct con_driver *con = class_get_devdata(class_device);
3057
3058         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3059                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3060                          con->desc);
3061
3062 }
3063
3064 static struct class_device_attribute class_device_attrs[] = {
3065         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3066         __ATTR(name, S_IRUGO, show_name, NULL),
3067 };
3068
3069 static int vtconsole_init_class_device(struct con_driver *con)
3070 {
3071         int i;
3072
3073         class_set_devdata(con->class_dev, con);
3074         for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
3075                 class_device_create_file(con->class_dev,
3076                                          &class_device_attrs[i]);
3077
3078         return 0;
3079 }
3080
3081 static void vtconsole_deinit_class_device(struct con_driver *con)
3082 {
3083         int i;
3084
3085         for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
3086                 class_device_remove_file(con->class_dev,
3087                                          &class_device_attrs[i]);
3088 }
3089
3090 /**
3091  * con_is_bound - checks if driver is bound to the console
3092  * @csw: console driver
3093  *
3094  * RETURNS: zero if unbound, nonzero if bound
3095  *
3096  * Drivers can call this and if zero, they should release
3097  * all resources allocated on con_startup()
3098  */
3099 int con_is_bound(const struct consw *csw)
3100 {
3101         int i, bound = 0;
3102
3103         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3104                 if (con_driver_map[i] == csw) {
3105                         bound = 1;
3106                         break;
3107                 }
3108         }
3109
3110         return bound;
3111 }
3112 EXPORT_SYMBOL(con_is_bound);
3113
3114 /**
3115  * register_con_driver - register console driver to console layer
3116  * @csw: console driver
3117  * @first: the first console to take over, minimum value is 0
3118  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3119  *
3120  * DESCRIPTION: This function registers a console driver which can later
3121  * bind to a range of consoles specified by @first and @last. It will
3122  * also initialize the console driver by calling con_startup().
3123  */
3124 int register_con_driver(const struct consw *csw, int first, int last)
3125 {
3126         struct module *owner = csw->owner;
3127         struct con_driver *con_driver;
3128         const char *desc;
3129         int i, retval = 0;
3130
3131         if (!try_module_get(owner))
3132                 return -ENODEV;
3133
3134         acquire_console_sem();
3135
3136         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3137                 con_driver = &registered_con_driver[i];
3138
3139                 /* already registered */
3140                 if (con_driver->con == csw)
3141                         retval = -EINVAL;
3142         }
3143
3144         if (retval)
3145                 goto err;
3146
3147         desc = csw->con_startup();
3148
3149         if (!desc)
3150                 goto err;
3151
3152         retval = -EINVAL;
3153
3154         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3155                 con_driver = &registered_con_driver[i];
3156
3157                 if (con_driver->con == NULL) {
3158                         con_driver->con = csw;
3159                         con_driver->desc = desc;
3160                         con_driver->node = i;
3161                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3162                                            CON_DRIVER_FLAG_INIT;
3163                         con_driver->first = first;
3164                         con_driver->last = last;
3165                         retval = 0;
3166                         break;
3167                 }
3168         }
3169
3170         if (retval)
3171                 goto err;
3172
3173         con_driver->class_dev = class_device_create(vtconsole_class, NULL,
3174                                                     MKDEV(0, con_driver->node),
3175                                                     NULL, "vtcon%i",
3176                                                     con_driver->node);
3177
3178         if (IS_ERR(con_driver->class_dev)) {
3179                 printk(KERN_WARNING "Unable to create class_device for %s; "
3180                        "errno = %ld\n", con_driver->desc,
3181                        PTR_ERR(con_driver->class_dev));
3182                 con_driver->class_dev = NULL;
3183         } else {
3184                 vtconsole_init_class_device(con_driver);
3185         }
3186 err:
3187         release_console_sem();
3188         module_put(owner);
3189         return retval;
3190 }
3191 EXPORT_SYMBOL(register_con_driver);
3192
3193 /**
3194  * unregister_con_driver - unregister console driver from console layer
3195  * @csw: console driver
3196  *
3197  * DESCRIPTION: All drivers that registers to the console layer must
3198  * call this function upon exit, or if the console driver is in a state
3199  * where it won't be able to handle console services, such as the
3200  * framebuffer console without loaded framebuffer drivers.
3201  *
3202  * The driver must unbind first prior to unregistration.
3203  */
3204 int unregister_con_driver(const struct consw *csw)
3205 {
3206         int i, retval = -ENODEV;
3207
3208         acquire_console_sem();
3209
3210         /* cannot unregister a bound driver */
3211         if (con_is_bound(csw))
3212                 goto err;
3213
3214         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3215                 struct con_driver *con_driver = &registered_con_driver[i];
3216
3217                 if (con_driver->con == csw &&
3218                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3219                         vtconsole_deinit_class_device(con_driver);
3220                         class_device_destroy(vtconsole_class,
3221                                              MKDEV(0, con_driver->node));
3222                         con_driver->con = NULL;
3223                         con_driver->desc = NULL;
3224                         con_driver->class_dev = NULL;
3225                         con_driver->node = 0;
3226                         con_driver->flag = 0;
3227                         con_driver->first = 0;
3228                         con_driver->last = 0;
3229                         retval = 0;
3230                         break;
3231                 }
3232         }
3233 err:
3234         release_console_sem();
3235         return retval;
3236 }
3237 EXPORT_SYMBOL(unregister_con_driver);
3238
3239 /*
3240  *      If we support more console drivers, this function is used
3241  *      when a driver wants to take over some existing consoles
3242  *      and become default driver for newly opened ones.
3243  *
3244  *      take_over_console is basically a register followed by unbind
3245  */
3246 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3247 {
3248         int err;
3249
3250         err = register_con_driver(csw, first, last);
3251
3252         if (!err)
3253                 bind_con_driver(csw, first, last, deflt);
3254
3255         return err;
3256 }
3257
3258 /*
3259  * give_up_console is a wrapper to unregister_con_driver. It will only
3260  * work if driver is fully unbound.
3261  */
3262 void give_up_console(const struct consw *csw)
3263 {
3264         unregister_con_driver(csw);
3265 }
3266
3267 static int __init vtconsole_class_init(void)
3268 {
3269         int i;
3270
3271         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3272         if (IS_ERR(vtconsole_class)) {
3273                 printk(KERN_WARNING "Unable to create vt console class; "
3274                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3275                 vtconsole_class = NULL;
3276         }
3277
3278         /* Add system drivers to sysfs */
3279         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3280                 struct con_driver *con = &registered_con_driver[i];
3281
3282                 if (con->con && !con->class_dev) {
3283                         con->class_dev =
3284                                 class_device_create(vtconsole_class, NULL,
3285                                                     MKDEV(0, con->node), NULL,
3286                                                     "vtcon%i", con->node);
3287
3288                         if (IS_ERR(con->class_dev)) {
3289                                 printk(KERN_WARNING "Unable to create "
3290                                        "class_device for %s; errno = %ld\n",
3291                                        con->desc, PTR_ERR(con->class_dev));
3292                                 con->class_dev = NULL;
3293                         } else {
3294                                 vtconsole_init_class_device(con);
3295                         }
3296                 }
3297         }
3298
3299         return 0;
3300 }
3301 postcore_initcall(vtconsole_class_init);
3302
3303 #endif
3304
3305 /*
3306  *      Screen blanking
3307  */
3308
3309 static void set_vesa_blanking(char __user *p)
3310 {
3311     unsigned int mode;
3312     get_user(mode, p + 1);
3313     vesa_blank_mode = (mode < 4) ? mode : 0;
3314 }
3315
3316 void do_blank_screen(int entering_gfx)
3317 {
3318         struct vc_data *vc = vc_cons[fg_console].d;
3319         int i;
3320
3321         WARN_CONSOLE_UNLOCKED();
3322
3323         if (console_blanked) {
3324                 if (blank_state == blank_vesa_wait) {
3325                         blank_state = blank_off;
3326                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3327                 }
3328                 return;
3329         }
3330         if (blank_state != blank_normal_wait)
3331                 return;
3332         blank_state = blank_off;
3333
3334         /* entering graphics mode? */
3335         if (entering_gfx) {
3336                 hide_cursor(vc);
3337                 save_screen(vc);
3338                 vc->vc_sw->con_blank(vc, -1, 1);
3339                 console_blanked = fg_console + 1;
3340                 set_origin(vc);
3341                 return;
3342         }
3343
3344         /* don't blank graphics */
3345         if (vc->vc_mode != KD_TEXT) {
3346                 console_blanked = fg_console + 1;
3347                 return;
3348         }
3349
3350         hide_cursor(vc);
3351         del_timer_sync(&console_timer);
3352         blank_timer_expired = 0;
3353
3354         save_screen(vc);
3355         /* In case we need to reset origin, blanking hook returns 1 */
3356         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3357         console_blanked = fg_console + 1;
3358         if (i)
3359                 set_origin(vc);
3360
3361         if (console_blank_hook && console_blank_hook(1))
3362                 return;
3363
3364         if (vesa_off_interval && vesa_blank_mode) {
3365                 blank_state = blank_vesa_wait;
3366                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3367         }
3368 }
3369 EXPORT_SYMBOL(do_blank_screen);
3370
3371 /*
3372  * Called by timer as well as from vt_console_driver
3373  */
3374 void do_unblank_screen(int leaving_gfx)
3375 {
3376         struct vc_data *vc;
3377
3378         /* This should now always be called from a "sane" (read: can schedule)
3379          * context for the sake of the low level drivers, except in the special
3380          * case of oops_in_progress
3381          */
3382         if (!oops_in_progress)
3383                 might_sleep();
3384
3385         WARN_CONSOLE_UNLOCKED();
3386
3387         ignore_poke = 0;
3388         if (!console_blanked)
3389                 return;
3390         if (!vc_cons_allocated(fg_console)) {
3391                 /* impossible */
3392                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3393                 return;
3394         }
3395         vc = vc_cons[fg_console].d;
3396         if (vc->vc_mode != KD_TEXT)
3397                 return; /* but leave console_blanked != 0 */
3398
3399         if (blankinterval) {
3400                 mod_timer(&console_timer, jiffies + blankinterval);
3401                 blank_state = blank_normal_wait;
3402         }
3403
3404         console_blanked = 0;
3405         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3406                 /* Low-level driver cannot restore -> do it ourselves */
3407                 update_screen(vc);
3408         if (console_blank_hook)
3409                 console_blank_hook(0);
3410         set_palette(vc);
3411         set_cursor(vc);
3412 }
3413 EXPORT_SYMBOL(do_unblank_screen);
3414
3415 /*
3416  * This is called by the outside world to cause a forced unblank, mostly for
3417  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3418  * call it with 1 as an argument and so force a mode restore... that may kill
3419  * X or at least garbage the screen but would also make the Oops visible...
3420  */
3421 void unblank_screen(void)
3422 {
3423         do_unblank_screen(0);
3424 }
3425
3426 /*
3427  * We defer the timer blanking to work queue so it can take the console mutex
3428  * (console operations can still happen at irq time, but only from printk which
3429  * has the console mutex. Not perfect yet, but better than no locking
3430  */
3431 static void blank_screen_t(unsigned long dummy)
3432 {
3433         if (unlikely(!keventd_up())) {
3434                 mod_timer(&console_timer, jiffies + blankinterval);
3435                 return;
3436         }
3437         blank_timer_expired = 1;
3438         schedule_work(&console_work);
3439 }
3440
3441 void poke_blanked_console(void)
3442 {
3443         WARN_CONSOLE_UNLOCKED();
3444
3445         /* Add this so we quickly catch whoever might call us in a non
3446          * safe context. Nowadays, unblank_screen() isn't to be called in
3447          * atomic contexts and is allowed to schedule (with the special case
3448          * of oops_in_progress, but that isn't of any concern for this
3449          * function. --BenH.
3450          */
3451         might_sleep();
3452
3453         /* This isn't perfectly race free, but a race here would be mostly harmless,
3454          * at worse, we'll do a spurrious blank and it's unlikely
3455          */
3456         del_timer(&console_timer);
3457         blank_timer_expired = 0;
3458
3459         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3460                 return;
3461         if (console_blanked)
3462                 unblank_screen();
3463         else if (blankinterval) {
3464                 mod_timer(&console_timer, jiffies + blankinterval);
3465                 blank_state = blank_normal_wait;
3466         }
3467 }
3468
3469 /*
3470  *      Palettes
3471  */
3472
3473 static void set_palette(struct vc_data *vc)
3474 {
3475         WARN_CONSOLE_UNLOCKED();
3476
3477         if (vc->vc_mode != KD_GRAPHICS)
3478                 vc->vc_sw->con_set_palette(vc, color_table);
3479 }
3480
3481 static int set_get_cmap(unsigned char __user *arg, int set)
3482 {
3483     int i, j, k;
3484
3485     WARN_CONSOLE_UNLOCKED();
3486
3487     for (i = 0; i < 16; i++)
3488         if (set) {
3489             get_user(default_red[i], arg++);
3490             get_user(default_grn[i], arg++);
3491             get_user(default_blu[i], arg++);
3492         } else {
3493             put_user(default_red[i], arg++);
3494             put_user(default_grn[i], arg++);
3495             put_user(default_blu[i], arg++);
3496         }
3497     if (set) {
3498         for (i = 0; i < MAX_NR_CONSOLES; i++)
3499             if (vc_cons_allocated(i)) {
3500                 for (j = k = 0; j < 16; j++) {
3501                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3502                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3503                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3504                 }
3505                 set_palette(vc_cons[i].d);
3506             }
3507     }
3508     return 0;
3509 }
3510
3511 /*
3512  * Load palette into the DAC registers. arg points to a colour
3513  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3514  */
3515
3516 int con_set_cmap(unsigned char __user *arg)
3517 {
3518         int rc;
3519
3520         acquire_console_sem();
3521         rc = set_get_cmap (arg,1);
3522         release_console_sem();
3523
3524         return rc;
3525 }
3526
3527 int con_get_cmap(unsigned char __user *arg)
3528 {
3529         int rc;
3530
3531         acquire_console_sem();
3532         rc = set_get_cmap (arg,0);
3533         release_console_sem();
3534
3535         return rc;
3536 }
3537
3538 void reset_palette(struct vc_data *vc)
3539 {
3540         int j, k;
3541         for (j=k=0; j<16; j++) {
3542                 vc->vc_palette[k++] = default_red[j];
3543                 vc->vc_palette[k++] = default_grn[j];
3544                 vc->vc_palette[k++] = default_blu[j];
3545         }
3546         set_palette(vc);
3547 }
3548
3549 /*
3550  *  Font switching
3551  *
3552  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3553  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3554  *  depending on width) reserved for each character which is kinda wasty, but
3555  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3556  *  is upto the actual low-level console-driver convert data into its favorite
3557  *  format (maybe we should add a `fontoffset' field to the `display'
3558  *  structure so we won't have to convert the fontdata all the time.
3559  *  /Jes
3560  */
3561
3562 #define max_font_size 65536
3563
3564 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3565 {
3566         struct console_font font;
3567         int rc = -EINVAL;
3568         int c;
3569
3570         if (vc->vc_mode != KD_TEXT)
3571                 return -EINVAL;
3572
3573         if (op->data) {
3574                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3575                 if (!font.data)
3576                         return -ENOMEM;
3577         } else
3578                 font.data = NULL;
3579
3580         acquire_console_sem();
3581         if (vc->vc_sw->con_font_get)
3582                 rc = vc->vc_sw->con_font_get(vc, &font);
3583         else
3584                 rc = -ENOSYS;
3585         release_console_sem();
3586
3587         if (rc)
3588                 goto out;
3589
3590         c = (font.width+7)/8 * 32 * font.charcount;
3591
3592         if (op->data && font.charcount > op->charcount)
3593                 rc = -ENOSPC;
3594         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3595                 if (font.width > op->width || font.height > op->height)
3596                         rc = -ENOSPC;
3597         } else {
3598                 if (font.width != 8)
3599                         rc = -EIO;
3600                 else if ((op->height && font.height > op->height) ||
3601                          font.height > 32)
3602                         rc = -ENOSPC;
3603         }
3604         if (rc)
3605                 goto out;
3606
3607         op->height = font.height;
3608         op->width = font.width;
3609         op->charcount = font.charcount;
3610
3611         if (op->data && copy_to_user(op->data, font.data, c))
3612                 rc = -EFAULT;
3613
3614 out:
3615         kfree(font.data);
3616         return rc;
3617 }
3618
3619 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3620 {
3621         struct console_font font;
3622         int rc = -EINVAL;
3623         int size;
3624
3625         if (vc->vc_mode != KD_TEXT)
3626                 return -EINVAL;
3627         if (!op->data)
3628                 return -EINVAL;
3629         if (op->charcount > 512)
3630                 return -EINVAL;
3631         if (!op->height) {              /* Need to guess font height [compat] */
3632                 int h, i;
3633                 u8 __user *charmap = op->data;
3634                 u8 tmp;
3635
3636                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3637                    so that we can get rid of this soon */
3638                 if (!(op->flags & KD_FONT_FLAG_OLD))
3639                         return -EINVAL;
3640                 for (h = 32; h > 0; h--)
3641                         for (i = 0; i < op->charcount; i++) {
3642                                 if (get_user(tmp, &charmap[32*i+h-1]))
3643                                         return -EFAULT;
3644                                 if (tmp)
3645                                         goto nonzero;
3646                         }
3647                 return -EINVAL;
3648         nonzero:
3649                 op->height = h;
3650         }
3651         if (op->width <= 0 || op->width > 32 || op->height > 32)
3652                 return -EINVAL;
3653         size = (op->width+7)/8 * 32 * op->charcount;
3654         if (size > max_font_size)
3655                 return -ENOSPC;
3656         font.charcount = op->charcount;
3657         font.height = op->height;
3658         font.width = op->width;
3659         font.data = kmalloc(size, GFP_KERNEL);
3660         if (!font.data)
3661                 return -ENOMEM;
3662         if (copy_from_user(font.data, op->data, size)) {
3663                 kfree(font.data);
3664                 return -EFAULT;
3665         }
3666         acquire_console_sem();
3667         if (vc->vc_sw->con_font_set)
3668                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3669         else
3670                 rc = -ENOSYS;
3671         release_console_sem();
3672         kfree(font.data);
3673         return rc;
3674 }
3675
3676 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3677 {
3678         struct console_font font = {.width = op->width, .height = op->height};
3679         char name[MAX_FONT_NAME];
3680         char *s = name;
3681         int rc;
3682
3683         if (vc->vc_mode != KD_TEXT)
3684                 return -EINVAL;
3685
3686         if (!op->data)
3687                 s = NULL;
3688         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3689                 return -EFAULT;
3690         else
3691                 name[MAX_FONT_NAME - 1] = 0;
3692
3693         acquire_console_sem();
3694         if (vc->vc_sw->con_font_default)
3695                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3696         else
3697                 rc = -ENOSYS;
3698         release_console_sem();
3699         if (!rc) {
3700                 op->width = font.width;
3701                 op->height = font.height;
3702         }
3703         return rc;
3704 }
3705
3706 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3707 {
3708         int con = op->height;
3709         int rc;
3710
3711         if (vc->vc_mode != KD_TEXT)
3712                 return -EINVAL;
3713
3714         acquire_console_sem();
3715         if (!vc->vc_sw->con_font_copy)
3716                 rc = -ENOSYS;
3717         else if (con < 0 || !vc_cons_allocated(con))
3718                 rc = -ENOTTY;
3719         else if (con == vc->vc_num)     /* nothing to do */
3720                 rc = 0;
3721         else
3722                 rc = vc->vc_sw->con_font_copy(vc, con);
3723         release_console_sem();
3724         return rc;
3725 }
3726
3727 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3728 {
3729         switch (op->op) {
3730         case KD_FONT_OP_SET:
3731                 return con_font_set(vc, op);
3732         case KD_FONT_OP_GET:
3733                 return con_font_get(vc, op);
3734         case KD_FONT_OP_SET_DEFAULT:
3735                 return con_font_default(vc, op);
3736         case KD_FONT_OP_COPY:
3737                 return con_font_copy(vc, op);
3738         }
3739         return -ENOSYS;
3740 }
3741
3742 /*
3743  *      Interface exported to selection and vcs.
3744  */
3745
3746 /* used by selection */
3747 u16 screen_glyph(struct vc_data *vc, int offset)
3748 {
3749         u16 w = scr_readw(screenpos(vc, offset, 1));
3750         u16 c = w & 0xff;
3751
3752         if (w & vc->vc_hi_font_mask)
3753                 c |= 0x100;
3754         return c;
3755 }
3756
3757 /* used by vcs - note the word offset */
3758 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3759 {
3760         return screenpos(vc, 2 * w_offset, viewed);
3761 }
3762
3763 void getconsxy(struct vc_data *vc, unsigned char *p)
3764 {
3765         p[0] = vc->vc_x;
3766         p[1] = vc->vc_y;
3767 }
3768
3769 void putconsxy(struct vc_data *vc, unsigned char *p)
3770 {
3771         hide_cursor(vc);
3772         gotoxy(vc, p[0], p[1]);
3773         set_cursor(vc);
3774 }
3775
3776 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3777 {
3778         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3779                 return softcursor_original;
3780         return scr_readw(org);
3781 }
3782
3783 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3784 {
3785         scr_writew(val, org);
3786         if ((unsigned long)org == vc->vc_pos) {
3787                 softcursor_original = -1;
3788                 add_softcursor(vc);
3789         }
3790 }
3791
3792 /*
3793  *      Visible symbols for modules
3794  */
3795
3796 EXPORT_SYMBOL(color_table);
3797 EXPORT_SYMBOL(default_red);
3798 EXPORT_SYMBOL(default_grn);
3799 EXPORT_SYMBOL(default_blu);
3800 EXPORT_SYMBOL(update_region);
3801 EXPORT_SYMBOL(redraw_screen);
3802 EXPORT_SYMBOL(vc_resize);
3803 EXPORT_SYMBOL(vc_lock_resize);
3804 EXPORT_SYMBOL(fg_console);
3805 EXPORT_SYMBOL(console_blank_hook);
3806 EXPORT_SYMBOL(console_blanked);
3807 EXPORT_SYMBOL(vc_cons);
3808 #ifndef VT_SINGLE_DRIVER
3809 EXPORT_SYMBOL(take_over_console);
3810 EXPORT_SYMBOL(give_up_console);
3811 #endif