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                 put_pid(vc->vt_pid);
 907                 module_put(vc->vc_sw->owner);
 908                 if (vc->vc_kmalloced)
 909                         kfree(vc->vc_screenbuf);
 910                 if (currcons >= MIN_NR_CONSOLES)
 911                         kfree(vc);
 912                 vc_cons[currcons].d = NULL;
 913         }
 914 }
 915
 916 /*
 917  *      VT102 emulator
 918  */
 919
 920 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 921 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 922 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 923
 924 #define decarm          VC_REPEAT
 925 #define decckm          VC_CKMODE
 926 #define kbdapplic       VC_APPLIC
 927 #define lnm             VC_CRLF
 928
 929 /*
 930  * this is what the terminal answers to a ESC-Z or csi0c query.
 931  */
 932 #define VT100ID "\033[?1;2c"
 933 #define VT102ID "\033[?6c"
 934
 935 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
 936                                        8,12,10,14, 9,13,11,15 };
 937
 938 /* the default colour table, for VGA+ colour systems */
 939 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
 940     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
 941 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
 942     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
 943 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
 944     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
 945
 946 /*
 947  * gotoxy() must verify all boundaries, because the arguments
 948  * might also be negative. If the given position is out of
 949  * bounds, the cursor is placed at the nearest margin.
 950  */
 951 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
 952 {
 953         int min_y, max_y;
 954
 955         if (new_x < 0)
 956                 vc->vc_x = 0;
 957         else {
 958                 if (new_x >= vc->vc_cols)
 959                         vc->vc_x = vc->vc_cols - 1;
 960                 else
 961                         vc->vc_x = new_x;
 962         }
 963
 964         if (vc->vc_decom) {
 965                 min_y = vc->vc_top;
 966                 max_y = vc->vc_bottom;
 967         } else {
 968                 min_y = 0;
 969                 max_y = vc->vc_rows;
 970         }
 971         if (new_y < min_y)
 972                 vc->vc_y = min_y;
 973         else if (new_y >= max_y)
 974                 vc->vc_y = max_y - 1;
 975         else
 976                 vc->vc_y = new_y;
 977         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
 978         vc->vc_need_wrap = 0;
 979 }
 980
 981 /* for absolute user moves, when decom is set */
 982 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
 983 {
 984         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
 985 }
 986
 987 void scrollback(struct vc_data *vc, int lines)
 988 {
 989         if (!lines)
 990                 lines = vc->vc_rows / 2;
 991         scrolldelta(-lines);
 992 }
 993
 994 void scrollfront(struct vc_data *vc, int lines)
 995 {
 996         if (!lines)
 997                 lines = vc->vc_rows / 2;
 998         scrolldelta(lines);
 999 }
1000
1001 static void lf(struct vc_data *vc)
1002 {
1003         /* don't scroll if above bottom of scrolling region, or
1004          * if below scrolling region
1005          */
1006         if (vc->vc_y + 1 == vc->vc_bottom)
1007                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1008         else if (vc->vc_y < vc->vc_rows - 1) {
1009                 vc->vc_y++;
1010                 vc->vc_pos += vc->vc_size_row;
1011         }
1012         vc->vc_need_wrap = 0;
1013 }
1014
1015 static void ri(struct vc_data *vc)
1016 {
1017         /* don't scroll if below top of scrolling region, or
1018          * if above scrolling region
1019          */
1020         if (vc->vc_y == vc->vc_top)
1021                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1022         else if (vc->vc_y > 0) {
1023                 vc->vc_y--;
1024                 vc->vc_pos -= vc->vc_size_row;
1025         }
1026         vc->vc_need_wrap = 0;
1027 }
1028
1029 static inline void cr(struct vc_data *vc)
1030 {
1031         vc->vc_pos -= vc->vc_x << 1;
1032         vc->vc_need_wrap = vc->vc_x = 0;
1033 }
1034
1035 static inline void bs(struct vc_data *vc)
1036 {
1037         if (vc->vc_x) {
1038                 vc->vc_pos -= 2;
1039                 vc->vc_x--;
1040                 vc->vc_need_wrap = 0;
1041         }
1042 }
1043
1044 static inline void del(struct vc_data *vc)
1045 {
1046         /* ignored */
1047 }
1048
1049 static void csi_J(struct vc_data *vc, int vpar)
1050 {
1051         unsigned int count;
1052         unsigned short * start;
1053
1054         switch (vpar) {
1055                 case 0: /* erase from cursor to end of display */
1056                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1057                         start = (unsigned short *)vc->vc_pos;
1058                         if (DO_UPDATE(vc)) {
1059                                 /* do in two stages */
1060                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1061                                               vc->vc_cols - vc->vc_x);
1062                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1063                                               vc->vc_rows - vc->vc_y - 1,
1064                                               vc->vc_cols);
1065                         }
1066                         break;
1067                 case 1: /* erase from start to cursor */
1068                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1069                         start = (unsigned short *)vc->vc_origin;
1070                         if (DO_UPDATE(vc)) {
1071                                 /* do in two stages */
1072                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1073                                               vc->vc_cols);
1074                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1075                                               vc->vc_x + 1);
1076                         }
1077                         break;
1078                 case 2: /* erase whole display */
1079                         count = vc->vc_cols * vc->vc_rows;
1080                         start = (unsigned short *)vc->vc_origin;
1081                         if (DO_UPDATE(vc))
1082                                 vc->vc_sw->con_clear(vc, 0, 0,
1083                                               vc->vc_rows,
1084                                               vc->vc_cols);
1085                         break;
1086                 default:
1087                         return;
1088         }
1089         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1090         vc->vc_need_wrap = 0;
1091 }
1092
1093 static void csi_K(struct vc_data *vc, int vpar)
1094 {
1095         unsigned int count;
1096         unsigned short * start;
1097
1098         switch (vpar) {
1099                 case 0: /* erase from cursor to end of line */
1100                         count = vc->vc_cols - vc->vc_x;
1101                         start = (unsigned short *)vc->vc_pos;
1102                         if (DO_UPDATE(vc))
1103                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1104                                                      vc->vc_cols - vc->vc_x);
1105                         break;
1106                 case 1: /* erase from start of line to cursor */
1107                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1108                         count = vc->vc_x + 1;
1109                         if (DO_UPDATE(vc))
1110                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1111                                                      vc->vc_x + 1);
1112                         break;
1113                 case 2: /* erase whole line */
1114                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1115                         count = vc->vc_cols;
1116                         if (DO_UPDATE(vc))
1117                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1118                                               vc->vc_cols);
1119                         break;
1120                 default:
1121                         return;
1122         }
1123         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1124         vc->vc_need_wrap = 0;
1125 }
1126
1127 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1128 {                                         /* not vt100? */
1129         int count;
1130
1131         if (!vpar)
1132                 vpar++;
1133         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1134
1135         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1136         if (DO_UPDATE(vc))
1137                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1138         vc->vc_need_wrap = 0;
1139 }
1140
1141 static void default_attr(struct vc_data *vc)
1142 {
1143         vc->vc_intensity = 1;
1144         vc->vc_underline = 0;
1145         vc->vc_reverse = 0;
1146         vc->vc_blink = 0;
1147         vc->vc_color = vc->vc_def_color;
1148 }
1149
1150 /* console_sem is held */
1151 static void csi_m(struct vc_data *vc)
1152 {
1153         int i;
1154
1155         for (i = 0; i <= vc->vc_npar; i++)
1156                 switch (vc->vc_par[i]) {
1157                         case 0: /* all attributes off */
1158                                 default_attr(vc);
1159                                 break;
1160                         case 1:
1161                                 vc->vc_intensity = 2;
1162                                 break;
1163                         case 2:
1164                                 vc->vc_intensity = 0;
1165                                 break;
1166                         case 4:
1167                                 vc->vc_underline = 1;
1168                                 break;
1169                         case 5:
1170                                 vc->vc_blink = 1;
1171                                 break;
1172                         case 7:
1173                                 vc->vc_reverse = 1;
1174                                 break;
1175                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1176                                   * Select primary font, don't display
1177                                   * control chars if defined, don't set
1178                                   * bit 8 on output.
1179                                   */
1180                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1181                                                 ? vc->vc_G0_charset
1182                                                 : vc->vc_G1_charset, vc);
1183                                 vc->vc_disp_ctrl = 0;
1184                                 vc->vc_toggle_meta = 0;
1185                                 break;
1186                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1187                                   * Select first alternate font, lets
1188                                   * chars < 32 be displayed as ROM chars.
1189                                   */
1190                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1191                                 vc->vc_disp_ctrl = 1;
1192                                 vc->vc_toggle_meta = 0;
1193                                 break;
1194                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1195                                   * Select second alternate font, toggle
1196                                   * high bit before displaying as ROM char.
1197                                   */
1198                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1199                                 vc->vc_disp_ctrl = 1;
1200                                 vc->vc_toggle_meta = 1;
1201                                 break;
1202                         case 21:
1203                         case 22:
1204                                 vc->vc_intensity = 1;
1205                                 break;
1206                         case 24:
1207                                 vc->vc_underline = 0;
1208                                 break;
1209                         case 25:
1210                                 vc->vc_blink = 0;
1211                                 break;
1212                         case 27:
1213                                 vc->vc_reverse = 0;
1214                                 break;
1215                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1216                                   * Enables underscore, white foreground
1217                                   * with white underscore (Linux - use
1218                                   * default foreground).
1219                                   */
1220                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1221                                 vc->vc_underline = 1;
1222                                 break;
1223                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1224                                   * Disable underline option.
1225                                   * Reset colour to default? It did this
1226                                   * before...
1227                                   */
1228                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1229                                 vc->vc_underline = 0;
1230                                 break;
1231                         case 49:
1232                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1233                                 break;
1234                         default:
1235                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1236                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1237                                                 | (vc->vc_color & 0xf0);
1238                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1239                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1240                                                 | (vc->vc_color & 0x0f);
1241                                 break;
1242                 }
1243         update_attr(vc);
1244 }
1245
1246 static void respond_string(const char *p, struct tty_struct *tty)
1247 {
1248         while (*p) {
1249                 tty_insert_flip_char(tty, *p, 0);
1250                 p++;
1251         }
1252         con_schedule_flip(tty);
1253 }
1254
1255 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1256 {
1257         char buf[40];
1258
1259         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1260         respond_string(buf, tty);
1261 }
1262
1263 static inline void status_report(struct tty_struct *tty)
1264 {
1265         respond_string("\033[0n", tty); /* Terminal ok */
1266 }
1267
1268 static inline void respond_ID(struct tty_struct * tty)
1269 {
1270         respond_string(VT102ID, tty);
1271 }
1272
1273 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1274 {
1275         char buf[8];
1276
1277         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1278                 (char)('!' + mry));
1279         respond_string(buf, tty);
1280 }
1281
1282 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1283 int mouse_reporting(void)
1284 {
1285         return vc_cons[fg_console].d->vc_report_mouse;
1286 }
1287
1288 /* console_sem is held */
1289 static void set_mode(struct vc_data *vc, int on_off)
1290 {
1291         int i;
1292
1293         for (i = 0; i <= vc->vc_npar; i++)
1294                 if (vc->vc_ques) {
1295                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1296                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1297                                 if (on_off)
1298                                         set_kbd(vc, decckm);
1299                                 else
1300                                         clr_kbd(vc, decckm);
1301                                 break;
1302                         case 3: /* 80/132 mode switch unimplemented */
1303                                 vc->vc_deccolm = on_off;
1304 #if 0
1305                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1306                                 /* this alone does not suffice; some user mode
1307                                    utility has to change the hardware regs */
1308 #endif
1309                                 break;
1310                         case 5:                 /* Inverted screen on/off */
1311                                 if (vc->vc_decscnm != on_off) {
1312                                         vc->vc_decscnm = on_off;
1313                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1314                                         update_attr(vc);
1315                                 }
1316                                 break;
1317                         case 6:                 /* Origin relative/absolute */
1318                                 vc->vc_decom = on_off;
1319                                 gotoxay(vc, 0, 0);
1320                                 break;
1321                         case 7:                 /* Autowrap on/off */
1322                                 vc->vc_decawm = on_off;
1323                                 break;
1324                         case 8:                 /* Autorepeat on/off */
1325                                 if (on_off)
1326                                         set_kbd(vc, decarm);
1327                                 else
1328                                         clr_kbd(vc, decarm);
1329                                 break;
1330                         case 9:
1331                                 vc->vc_report_mouse = on_off ? 1 : 0;
1332                                 break;
1333                         case 25:                /* Cursor on/off */
1334                                 vc->vc_deccm = on_off;
1335                                 break;
1336                         case 1000:
1337                                 vc->vc_report_mouse = on_off ? 2 : 0;
1338                                 break;
1339                         }
1340                 } else {
1341                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1342                         case 3:                 /* Monitor (display ctrls) */
1343                                 vc->vc_disp_ctrl = on_off;
1344                                 break;
1345                         case 4:                 /* Insert Mode on/off */
1346                                 vc->vc_decim = on_off;
1347                                 break;
1348                         case 20:                /* Lf, Enter == CrLf/Lf */
1349                                 if (on_off)
1350                                         set_kbd(vc, lnm);
1351                                 else
1352                                         clr_kbd(vc, lnm);
1353                                 break;
1354                         }
1355                 }
1356 }
1357
1358 /* console_sem is held */
1359 static void setterm_command(struct vc_data *vc)
1360 {
1361         switch(vc->vc_par[0]) {
1362                 case 1: /* set color for underline mode */
1363                         if (vc->vc_can_do_color &&
1364                                         vc->vc_par[1] < 16) {
1365                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1366                                 if (vc->vc_underline)
1367                                         update_attr(vc);
1368                         }
1369                         break;
1370                 case 2: /* set color for half intensity mode */
1371                         if (vc->vc_can_do_color &&
1372                                         vc->vc_par[1] < 16) {
1373                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1374                                 if (vc->vc_intensity == 0)
1375                                         update_attr(vc);
1376                         }
1377                         break;
1378                 case 8: /* store colors as defaults */
1379                         vc->vc_def_color = vc->vc_attr;
1380                         if (vc->vc_hi_font_mask == 0x100)
1381                                 vc->vc_def_color >>= 1;
1382                         default_attr(vc);
1383                         update_attr(vc);
1384                         break;
1385                 case 9: /* set blanking interval */
1386                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1387                         poke_blanked_console();
1388                         break;
1389                 case 10: /* set bell frequency in Hz */
1390                         if (vc->vc_npar >= 1)
1391                                 vc->vc_bell_pitch = vc->vc_par[1];
1392                         else
1393                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1394                         break;
1395                 case 11: /* set bell duration in msec */
1396                         if (vc->vc_npar >= 1)
1397                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1398                                         vc->vc_par[1] * HZ / 1000 : 0;
1399                         else
1400                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1401                         break;
1402                 case 12: /* bring specified console to the front */
1403                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1404                                 set_console(vc->vc_par[1] - 1);
1405                         break;
1406                 case 13: /* unblank the screen */
1407                         poke_blanked_console();
1408                         break;
1409                 case 14: /* set vesa powerdown interval */
1410                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1411                         break;
1412                 case 15: /* activate the previous console */
1413                         set_console(last_console);
1414                         break;
1415         }
1416 }
1417
1418 /* console_sem is held */
1419 static void csi_at(struct vc_data *vc, unsigned int nr)
1420 {
1421         if (nr > vc->vc_cols - vc->vc_x)
1422                 nr = vc->vc_cols - vc->vc_x;
1423         else if (!nr)
1424                 nr = 1;
1425         insert_char(vc, nr);
1426 }
1427
1428 /* console_sem is held */
1429 static void csi_L(struct vc_data *vc, unsigned int nr)
1430 {
1431         if (nr > vc->vc_rows - vc->vc_y)
1432                 nr = vc->vc_rows - vc->vc_y;
1433         else if (!nr)
1434                 nr = 1;
1435         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1436         vc->vc_need_wrap = 0;
1437 }
1438
1439 /* console_sem is held */
1440 static void csi_P(struct vc_data *vc, unsigned int nr)
1441 {
1442         if (nr > vc->vc_cols - vc->vc_x)
1443                 nr = vc->vc_cols - vc->vc_x;
1444         else if (!nr)
1445                 nr = 1;
1446         delete_char(vc, nr);
1447 }
1448
1449 /* console_sem is held */
1450 static void csi_M(struct vc_data *vc, unsigned int nr)
1451 {
1452         if (nr > vc->vc_rows - vc->vc_y)
1453                 nr = vc->vc_rows - vc->vc_y;
1454         else if (!nr)
1455                 nr=1;
1456         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1457         vc->vc_need_wrap = 0;
1458 }
1459
1460 /* console_sem is held (except via vc_init->reset_terminal */
1461 static void save_cur(struct vc_data *vc)
1462 {
1463         vc->vc_saved_x          = vc->vc_x;
1464         vc->vc_saved_y          = vc->vc_y;
1465         vc->vc_s_intensity      = vc->vc_intensity;
1466         vc->vc_s_underline      = vc->vc_underline;
1467         vc->vc_s_blink          = vc->vc_blink;
1468         vc->vc_s_reverse        = vc->vc_reverse;
1469         vc->vc_s_charset        = vc->vc_charset;
1470         vc->vc_s_color          = vc->vc_color;
1471         vc->vc_saved_G0         = vc->vc_G0_charset;
1472         vc->vc_saved_G1         = vc->vc_G1_charset;
1473 }
1474
1475 /* console_sem is held */
1476 static void restore_cur(struct vc_data *vc)
1477 {
1478         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1479         vc->vc_intensity        = vc->vc_s_intensity;
1480         vc->vc_underline        = vc->vc_s_underline;
1481         vc->vc_blink            = vc->vc_s_blink;
1482         vc->vc_reverse          = vc->vc_s_reverse;
1483         vc->vc_charset          = vc->vc_s_charset;
1484         vc->vc_color            = vc->vc_s_color;
1485         vc->vc_G0_charset       = vc->vc_saved_G0;
1486         vc->vc_G1_charset       = vc->vc_saved_G1;
1487         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1488         update_attr(vc);
1489         vc->vc_need_wrap = 0;
1490 }
1491
1492 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1493         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1494         ESpalette };
1495
1496 /* console_sem is held (except via vc_init()) */
1497 static void reset_terminal(struct vc_data *vc, int do_clear)
1498 {
1499         vc->vc_top              = 0;
1500         vc->vc_bottom           = vc->vc_rows;
1501         vc->vc_state            = ESnormal;
1502         vc->vc_ques             = 0;
1503         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1504         vc->vc_G0_charset       = LAT1_MAP;
1505         vc->vc_G1_charset       = GRAF_MAP;
1506         vc->vc_charset          = 0;
1507         vc->vc_need_wrap        = 0;
1508         vc->vc_report_mouse     = 0;
1509         vc->vc_utf              = 0;
1510         vc->vc_utf_count        = 0;
1511
1512         vc->vc_disp_ctrl        = 0;
1513         vc->vc_toggle_meta      = 0;
1514
1515         vc->vc_decscnm          = 0;
1516         vc->vc_decom            = 0;
1517         vc->vc_decawm           = 1;
1518         vc->vc_deccm            = 1;
1519         vc->vc_decim            = 0;
1520
1521         set_kbd(vc, decarm);
1522         clr_kbd(vc, decckm);
1523         clr_kbd(vc, kbdapplic);
1524         clr_kbd(vc, lnm);
1525         kbd_table[vc->vc_num].lockstate = 0;
1526         kbd_table[vc->vc_num].slockstate = 0;
1527         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1528         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1529         /* do not do set_leds here because this causes an endless tasklet loop
1530            when the keyboard hasn't been initialized yet */
1531
1532         vc->vc_cursor_type = CUR_DEFAULT;
1533         vc->vc_complement_mask = vc->vc_s_complement_mask;
1534
1535         default_attr(vc);
1536         update_attr(vc);
1537
1538         vc->vc_tab_stop[0]      = 0x01010100;
1539         vc->vc_tab_stop[1]      =
1540         vc->vc_tab_stop[2]      =
1541         vc->vc_tab_stop[3]      =
1542         vc->vc_tab_stop[4]      = 0x01010101;
1543
1544         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1545         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1546
1547         gotoxy(vc, 0, 0);
1548         save_cur(vc);
1549         if (do_clear)
1550             csi_J(vc, 2);
1551 }
1552
1553 /* console_sem is held */
1554 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1555 {
1556         /*
1557          *  Control characters can be used in the _middle_
1558          *  of an escape sequence.
1559          */
1560         switch (c) {
1561         case 0:
1562                 return;
1563         case 7:
1564                 if (vc->vc_bell_duration)
1565                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1566                 return;
1567         case 8:
1568                 bs(vc);
1569                 return;
1570         case 9:
1571                 vc->vc_pos -= (vc->vc_x << 1);
1572                 while (vc->vc_x < vc->vc_cols - 1) {
1573                         vc->vc_x++;
1574                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1575                                 break;
1576                 }
1577                 vc->vc_pos += (vc->vc_x << 1);
1578                 return;
1579         case 10: case 11: case 12:
1580                 lf(vc);
1581                 if (!is_kbd(vc, lnm))
1582                         return;
1583         case 13:
1584                 cr(vc);
1585                 return;
1586         case 14:
1587                 vc->vc_charset = 1;
1588                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1589                 vc->vc_disp_ctrl = 1;
1590                 return;
1591         case 15:
1592                 vc->vc_charset = 0;
1593                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1594                 vc->vc_disp_ctrl = 0;
1595                 return;
1596         case 24: case 26:
1597                 vc->vc_state = ESnormal;
1598                 return;
1599         case 27:
1600                 vc->vc_state = ESesc;
1601                 return;
1602         case 127:
1603                 del(vc);
1604                 return;
1605         case 128+27:
1606                 vc->vc_state = ESsquare;
1607                 return;
1608         }
1609         switch(vc->vc_state) {
1610         case ESesc:
1611                 vc->vc_state = ESnormal;
1612                 switch (c) {
1613                 case '[':
1614                         vc->vc_state = ESsquare;
1615                         return;
1616                 case ']':
1617                         vc->vc_state = ESnonstd;
1618                         return;
1619                 case '%':
1620                         vc->vc_state = ESpercent;
1621                         return;
1622                 case 'E':
1623                         cr(vc);
1624                         lf(vc);
1625                         return;
1626                 case 'M':
1627                         ri(vc);
1628                         return;
1629                 case 'D':
1630                         lf(vc);
1631                         return;
1632                 case 'H':
1633                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1634                         return;
1635                 case 'Z':
1636                         respond_ID(tty);
1637                         return;
1638                 case '7':
1639                         save_cur(vc);
1640                         return;
1641                 case '8':
1642                         restore_cur(vc);
1643                         return;
1644                 case '(':
1645                         vc->vc_state = ESsetG0;
1646                         return;
1647                 case ')':
1648                         vc->vc_state = ESsetG1;
1649                         return;
1650                 case '#':
1651                         vc->vc_state = EShash;
1652                         return;
1653                 case 'c':
1654                         reset_terminal(vc, 1);
1655                         return;
1656                 case '>':  /* Numeric keypad */
1657                         clr_kbd(vc, kbdapplic);
1658                         return;
1659                 case '=':  /* Appl. keypad */
1660                         set_kbd(vc, kbdapplic);
1661                         return;
1662                 }
1663                 return;
1664         case ESnonstd:
1665                 if (c=='P') {   /* palette escape sequence */
1666                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1667                                 vc->vc_par[vc->vc_npar] = 0;
1668                         vc->vc_npar = 0;
1669                         vc->vc_state = ESpalette;
1670                         return;
1671                 } else if (c=='R') {   /* reset palette */
1672                         reset_palette(vc);
1673                         vc->vc_state = ESnormal;
1674                 } else
1675                         vc->vc_state = ESnormal;
1676                 return;
1677         case ESpalette:
1678                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1679                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1680                         if (vc->vc_npar == 7) {
1681                                 int i = vc->vc_par[0] * 3, j = 1;
1682                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1683                                 vc->vc_palette[i++] += vc->vc_par[j++];
1684                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1685                                 vc->vc_palette[i++] += vc->vc_par[j++];
1686                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1687                                 vc->vc_palette[i] += vc->vc_par[j];
1688                                 set_palette(vc);
1689                                 vc->vc_state = ESnormal;
1690                         }
1691                 } else
1692                         vc->vc_state = ESnormal;
1693                 return;
1694         case ESsquare:
1695                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1696                         vc->vc_par[vc->vc_npar] = 0;
1697                 vc->vc_npar = 0;
1698                 vc->vc_state = ESgetpars;
1699                 if (c == '[') { /* Function key */
1700                         vc->vc_state=ESfunckey;
1701                         return;
1702                 }
1703                 vc->vc_ques = (c == '?');
1704                 if (vc->vc_ques)
1705                         return;
1706         case ESgetpars:
1707                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1708                         vc->vc_npar++;
1709                         return;
1710                 } else if (c>='0' && c<='9') {
1711                         vc->vc_par[vc->vc_npar] *= 10;
1712                         vc->vc_par[vc->vc_npar] += c - '0';
1713                         return;
1714                 } else
1715                         vc->vc_state = ESgotpars;
1716         case ESgotpars:
1717                 vc->vc_state = ESnormal;
1718                 switch(c) {
1719                 case 'h':
1720                         set_mode(vc, 1);
1721                         return;
1722                 case 'l':
1723                         set_mode(vc, 0);
1724                         return;
1725                 case 'c':
1726                         if (vc->vc_ques) {
1727                                 if (vc->vc_par[0])
1728                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1729                                 else
1730                                         vc->vc_cursor_type = CUR_DEFAULT;
1731                                 return;
1732                         }
1733                         break;
1734                 case 'm':
1735                         if (vc->vc_ques) {
1736                                 clear_selection();
1737                                 if (vc->vc_par[0])
1738                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1739                                 else
1740                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1741                                 return;
1742                         }
1743                         break;
1744                 case 'n':
1745                         if (!vc->vc_ques) {
1746                                 if (vc->vc_par[0] == 5)
1747                                         status_report(tty);
1748                                 else if (vc->vc_par[0] == 6)
1749                                         cursor_report(vc, tty);
1750                         }
1751                         return;
1752                 }
1753                 if (vc->vc_ques) {
1754                         vc->vc_ques = 0;
1755                         return;
1756                 }
1757                 switch(c) {
1758                 case 'G': case '`':
1759                         if (vc->vc_par[0])
1760                                 vc->vc_par[0]--;
1761                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1762                         return;
1763                 case 'A':
1764                         if (!vc->vc_par[0])
1765                                 vc->vc_par[0]++;
1766                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1767                         return;
1768                 case 'B': case 'e':
1769                         if (!vc->vc_par[0])
1770                                 vc->vc_par[0]++;
1771                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1772                         return;
1773                 case 'C': case 'a':
1774                         if (!vc->vc_par[0])
1775                                 vc->vc_par[0]++;
1776                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1777                         return;
1778                 case 'D':
1779                         if (!vc->vc_par[0])
1780                                 vc->vc_par[0]++;
1781                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1782                         return;
1783                 case 'E':
1784                         if (!vc->vc_par[0])
1785                                 vc->vc_par[0]++;
1786                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1787                         return;
1788                 case 'F':
1789                         if (!vc->vc_par[0])
1790                                 vc->vc_par[0]++;
1791                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1792                         return;
1793                 case 'd':
1794                         if (vc->vc_par[0])
1795                                 vc->vc_par[0]--;
1796                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1797                         return;
1798                 case 'H': case 'f':
1799                         if (vc->vc_par[0])
1800                                 vc->vc_par[0]--;
1801                         if (vc->vc_par[1])
1802                                 vc->vc_par[1]--;
1803                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1804                         return;
1805                 case 'J':
1806                         csi_J(vc, vc->vc_par[0]);
1807                         return;
1808                 case 'K':
1809                         csi_K(vc, vc->vc_par[0]);
1810                         return;
1811                 case 'L':
1812                         csi_L(vc, vc->vc_par[0]);
1813                         return;
1814                 case 'M':
1815                         csi_M(vc, vc->vc_par[0]);
1816                         return;
1817                 case 'P':
1818                         csi_P(vc, vc->vc_par[0]);
1819                         return;
1820                 case 'c':
1821                         if (!vc->vc_par[0])
1822                                 respond_ID(tty);
1823                         return;
1824                 case 'g':
1825                         if (!vc->vc_par[0])
1826                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1827                         else if (vc->vc_par[0] == 3) {
1828                                 vc->vc_tab_stop[0] =
1829                                         vc->vc_tab_stop[1] =
1830                                         vc->vc_tab_stop[2] =
1831                                         vc->vc_tab_stop[3] =
1832                                         vc->vc_tab_stop[4] = 0;
1833                         }
1834                         return;
1835                 case 'm':
1836                         csi_m(vc);
1837                         return;
1838                 case 'q': /* DECLL - but only 3 leds */
1839                         /* map 0,1,2,3 to 0,1,2,4 */
1840                         if (vc->vc_par[0] < 4)
1841                                 setledstate(kbd_table + vc->vc_num,
1842                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1843                         return;
1844                 case 'r':
1845                         if (!vc->vc_par[0])
1846                                 vc->vc_par[0]++;
1847                         if (!vc->vc_par[1])
1848                                 vc->vc_par[1] = vc->vc_rows;
1849                         /* Minimum allowed region is 2 lines */
1850                         if (vc->vc_par[0] < vc->vc_par[1] &&
1851                             vc->vc_par[1] <= vc->vc_rows) {
1852                                 vc->vc_top = vc->vc_par[0] - 1;
1853                                 vc->vc_bottom = vc->vc_par[1];
1854                                 gotoxay(vc, 0, 0);
1855                         }
1856                         return;
1857                 case 's':
1858                         save_cur(vc);
1859                         return;
1860                 case 'u':
1861                         restore_cur(vc);
1862                         return;
1863                 case 'X':
1864                         csi_X(vc, vc->vc_par[0]);
1865                         return;
1866                 case '@':
1867                         csi_at(vc, vc->vc_par[0]);
1868                         return;
1869                 case ']': /* setterm functions */
1870                         setterm_command(vc);
1871                         return;
1872                 }
1873                 return;
1874         case ESpercent:
1875                 vc->vc_state = ESnormal;
1876                 switch (c) {
1877                 case '@':  /* defined in ISO 2022 */
1878                         vc->vc_utf = 0;
1879                         return;
1880                 case 'G':  /* prelim official escape code */
1881                 case '8':  /* retained for compatibility */
1882                         vc->vc_utf = 1;
1883                         return;
1884                 }
1885                 return;
1886         case ESfunckey:
1887                 vc->vc_state = ESnormal;
1888                 return;
1889         case EShash:
1890                 vc->vc_state = ESnormal;
1891                 if (c == '8') {
1892                         /* DEC screen alignment test. kludge :-) */
1893                         vc->vc_video_erase_char =
1894                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1895                         csi_J(vc, 2);
1896                         vc->vc_video_erase_char =
1897                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1898                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1899                 }
1900                 return;
1901         case ESsetG0:
1902                 if (c == '0')
1903                         vc->vc_G0_charset = GRAF_MAP;
1904                 else if (c == 'B')
1905                         vc->vc_G0_charset = LAT1_MAP;
1906                 else if (c == 'U')
1907                         vc->vc_G0_charset = IBMPC_MAP;
1908                 else if (c == 'K')
1909                         vc->vc_G0_charset = USER_MAP;
1910                 if (vc->vc_charset == 0)
1911                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1912                 vc->vc_state = ESnormal;
1913                 return;
1914         case ESsetG1:
1915                 if (c == '0')
1916                         vc->vc_G1_charset = GRAF_MAP;
1917                 else if (c == 'B')
1918                         vc->vc_G1_charset = LAT1_MAP;
1919                 else if (c == 'U')
1920                         vc->vc_G1_charset = IBMPC_MAP;
1921                 else if (c == 'K')
1922                         vc->vc_G1_charset = USER_MAP;
1923                 if (vc->vc_charset == 1)
1924                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1925                 vc->vc_state = ESnormal;
1926                 return;
1927         default:
1928                 vc->vc_state = ESnormal;
1929         }
1930 }
1931
1932 /* This is a temporary buffer used to prepare a tty console write
1933  * so that we can easily avoid touching user space while holding the
1934  * console spinlock.  It is allocated in con_init and is shared by
1935  * this code and the vc_screen read/write tty calls.
1936  *
1937  * We have to allocate this statically in the kernel data section
1938  * since console_init (and thus con_init) are called before any
1939  * kernel memory allocation is available.
1940  */
1941 char con_buf[CON_BUF_SIZE];
1942 DECLARE_MUTEX(con_buf_sem);
1943
1944 /* acquires console_sem */
1945 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1946 {
1947 #ifdef VT_BUF_VRAM_ONLY
1948 #define FLUSH do { } while(0);
1949 #else
1950 #define FLUSH if (draw_x >= 0) { \
1951         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1952         draw_x = -1; \
1953         }
1954 #endif
1955
1956         int c, tc, ok, n = 0, draw_x = -1;
1957         unsigned int currcons;
1958         unsigned long draw_from = 0, draw_to = 0;
1959         struct vc_data *vc;
1960         u16 himask, charmask;
1961         const unsigned char *orig_buf = NULL;
1962         int orig_count;
1963
1964         if (in_interrupt())
1965                 return count;
1966
1967         might_sleep();
1968
1969         acquire_console_sem();
1970         vc = tty->driver_data;
1971         if (vc == NULL) {
1972                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1973                 release_console_sem();
1974                 return 0;
1975         }
1976
1977         currcons = vc->vc_num;
1978         if (!vc_cons_allocated(currcons)) {
1979             /* could this happen? */
1980             static int error = 0;
1981             if (!error) {
1982                 error = 1;
1983                 printk("con_write: tty %d not allocated\n", currcons+1);
1984             }
1985             release_console_sem();
1986             return 0;
1987         }
1988         release_console_sem();
1989
1990         orig_buf = buf;
1991         orig_count = count;
1992
1993         /* At this point 'buf' is guaranteed to be a kernel buffer
1994          * and therefore no access to userspace (and therefore sleeping)
1995          * will be needed.  The con_buf_sem serializes all tty based
1996          * console rendering and vcs write/read operations.  We hold
1997          * the console spinlock during the entire write.
1998          */
1999
2000         acquire_console_sem();
2001
2002         vc = tty->driver_data;
2003         if (vc == NULL) {
2004                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2005                 release_console_sem();
2006                 goto out;
2007         }
2008
2009         himask = vc->vc_hi_font_mask;
2010         charmask = himask ? 0x1ff : 0xff;
2011
2012         /* undraw cursor first */
2013         if (IS_FG(vc))
2014                 hide_cursor(vc);
2015
2016         while (!tty->stopped && count) {
2017                 int orig = *buf;
2018                 c = orig;
2019                 buf++;
2020                 n++;
2021                 count--;
2022
2023                 /* Do no translation at all in control states */
2024                 if (vc->vc_state != ESnormal) {
2025                         tc = c;
2026                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2027                     /* Combine UTF-8 into Unicode */
2028                     /* Malformed sequences as sequences of replacement glyphs */
2029 rescan_last_byte:
2030                     if(c > 0x7f) {
2031                         if (vc->vc_utf_count) {
2032                                if ((c & 0xc0) == 0x80) {
2033                                        vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2034                                        if (--vc->vc_utf_count) {
2035                                                vc->vc_npar++;
2036                                                continue;
2037                                        }
2038                                        tc = c = vc->vc_utf_char;
2039                                } else
2040                                        goto replacement_glyph;
2041                         } else {
2042                                 vc->vc_npar = 0;
2043                                 if ((c & 0xe0) == 0xc0) {
2044                                     vc->vc_utf_count = 1;
2045                                     vc->vc_utf_char = (c & 0x1f);
2046                                 } else if ((c & 0xf0) == 0xe0) {
2047                                     vc->vc_utf_count = 2;
2048                                     vc->vc_utf_char = (c & 0x0f);
2049                                 } else if ((c & 0xf8) == 0xf0) {
2050                                     vc->vc_utf_count = 3;
2051                                     vc->vc_utf_char = (c & 0x07);
2052                                 } else if ((c & 0xfc) == 0xf8) {
2053                                     vc->vc_utf_count = 4;
2054                                     vc->vc_utf_char = (c & 0x03);
2055                                 } else if ((c & 0xfe) == 0xfc) {
2056                                     vc->vc_utf_count = 5;
2057                                     vc->vc_utf_char = (c & 0x01);
2058                                 } else
2059                                     goto replacement_glyph;
2060                                 continue;
2061                               }
2062                     } else {
2063                       if (vc->vc_utf_count)
2064                               goto replacement_glyph;
2065                       tc = c;
2066                     }
2067                 } else {        /* no utf or alternate charset mode */
2068                   tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2069                 }
2070
2071                 /* If the original code was a control character we
2072                  * only allow a glyph to be displayed if the code is
2073                  * not normally used (such as for cursor movement) or
2074                  * if the disp_ctrl mode has been explicitly enabled.
2075                  * Certain characters (as given by the CTRL_ALWAYS
2076                  * bitmap) are always displayed as control characters,
2077                  * as the console would be pretty useless without
2078                  * them; to display an arbitrary font position use the
2079                  * direct-to-font zone in UTF-8 mode.
2080                  */
2081                 ok = tc && (c >= 32 ||
2082                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2083                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2084                         && (c != 127 || vc->vc_disp_ctrl)
2085                         && (c != 128+27);
2086
2087                 if (vc->vc_state == ESnormal && ok) {
2088                         /* Now try to find out how to display it */
2089                         tc = conv_uni_to_pc(vc, tc);
2090                         if (tc & ~charmask) {
2091                                 if ( tc == -4 ) {
2092                                 /* If we got -4 (not found) then see if we have
2093                                    defined a replacement character (U+FFFD) */
2094 replacement_glyph:
2095                                         tc = conv_uni_to_pc(vc, 0xfffd);
2096                                         if (!(tc & ~charmask))
2097                                                 goto display_glyph;
2098                                 } else if ( tc != -3 )
2099                                         continue; /* nothing to display */
2100                                 /* no hash table or no replacement --
2101                                  * hope for the best */
2102                                 if ( c & ~charmask )
2103                                         tc = '?';
2104                                 else
2105                                         tc = c;
2106                         }
2107
2108 display_glyph:
2109                         if (vc->vc_need_wrap || vc->vc_decim)
2110                                 FLUSH
2111                         if (vc->vc_need_wrap) {
2112                                 cr(vc);
2113                                 lf(vc);
2114                         }
2115                         if (vc->vc_decim)
2116                                 insert_char(vc, 1);
2117                         scr_writew(himask ?
2118                                      ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2119                                      (vc->vc_attr << 8) + tc,
2120                                    (u16 *) vc->vc_pos);
2121                         if (DO_UPDATE(vc) && draw_x < 0) {
2122                                 draw_x = vc->vc_x;
2123                                 draw_from = vc->vc_pos;
2124                         }
2125                         if (vc->vc_x == vc->vc_cols - 1) {
2126                                 vc->vc_need_wrap = vc->vc_decawm;
2127                                 draw_to = vc->vc_pos + 2;
2128                         } else {
2129                                 vc->vc_x++;
2130                                 draw_to = (vc->vc_pos += 2);
2131                         }
2132                         if (vc->vc_utf_count) {
2133                                 if (vc->vc_npar) {
2134                                         vc->vc_npar--;
2135                                         goto display_glyph;
2136                                 }
2137                                 vc->vc_utf_count = 0;
2138                                 c = orig;
2139                                 goto rescan_last_byte;
2140                         }
2141                         continue;
2142                 }
2143                 FLUSH
2144                 do_con_trol(tty, vc, orig);
2145         }
2146         FLUSH
2147         console_conditional_schedule();
2148         release_console_sem();
2149
2150 out:
2151         return n;
2152 #undef FLUSH
2153 }
2154
2155 /*
2156  * This is the console switching callback.
2157  *
2158  * Doing console switching in a process context allows
2159  * us to do the switches asynchronously (needed when we want
2160  * to switch due to a keyboard interrupt).  Synchronization
2161  * with other console code and prevention of re-entrancy is
2162  * ensured with console_sem.
2163  */
2164 static void console_callback(void *ignored)
2165 {
2166         acquire_console_sem();
2167
2168         if (want_console >= 0) {
2169                 if (want_console != fg_console &&
2170                     vc_cons_allocated(want_console)) {
2171                         hide_cursor(vc_cons[fg_console].d);
2172                         change_console(vc_cons[want_console].d);
2173                         /* we only changed when the console had already
2174                            been allocated - a new console is not created
2175                            in an interrupt routine */
2176                 }
2177                 want_console = -1;
2178         }
2179         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2180                 do_poke_blanked_console = 0;
2181                 poke_blanked_console();
2182         }
2183         if (scrollback_delta) {
2184                 struct vc_data *vc = vc_cons[fg_console].d;
2185                 clear_selection();
2186                 if (vc->vc_mode == KD_TEXT)
2187                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2188                 scrollback_delta = 0;
2189         }
2190         if (blank_timer_expired) {
2191                 do_blank_screen(0);
2192                 blank_timer_expired = 0;
2193         }
2194
2195         release_console_sem();
2196 }
2197
2198 void set_console(int nr)
2199 {
2200         want_console = nr;
2201         schedule_console_callback();
2202 }
2203
2204 struct tty_driver *console_driver;
2205
2206 #ifdef CONFIG_VT_CONSOLE
2207
2208 /*
2209  *      Console on virtual terminal
2210  *
2211  * The console must be locked when we get here.
2212  */
2213
2214 static void vt_console_print(struct console *co, const char *b, unsigned count)
2215 {
2216         struct vc_data *vc = vc_cons[fg_console].d;
2217         unsigned char c;
2218         static unsigned long printing;
2219         const ushort *start;
2220         ushort cnt = 0;
2221         ushort myx;
2222
2223         /* console busy or not yet initialized */
2224         if (!printable || test_and_set_bit(0, &printing))
2225                 return;
2226
2227         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2228                 vc = vc_cons[kmsg_redirect - 1].d;
2229
2230         /* read `x' only after setting currcons properly (otherwise
2231            the `x' macro will read the x of the foreground console). */
2232         myx = vc->vc_x;
2233
2234         if (!vc_cons_allocated(fg_console)) {
2235                 /* impossible */
2236                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2237                 goto quit;
2238         }
2239
2240         if (vc->vc_mode != KD_TEXT)
2241                 goto quit;
2242
2243         /* undraw cursor first */
2244         if (IS_FG(vc))
2245                 hide_cursor(vc);
2246
2247         start = (ushort *)vc->vc_pos;
2248
2249         /* Contrived structure to try to emulate original need_wrap behaviour
2250          * Problems caused when we have need_wrap set on '\n' character */
2251         while (count--) {
2252                 c = *b++;
2253                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2254                         if (cnt > 0) {
2255                                 if (CON_IS_VISIBLE(vc))
2256                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2257                                 vc->vc_x += cnt;
2258                                 if (vc->vc_need_wrap)
2259                                         vc->vc_x--;
2260                                 cnt = 0;
2261                         }
2262                         if (c == 8) {           /* backspace */
2263                                 bs(vc);
2264                                 start = (ushort *)vc->vc_pos;
2265                                 myx = vc->vc_x;
2266                                 continue;
2267                         }
2268                         if (c != 13)
2269                                 lf(vc);
2270                         cr(vc);
2271                         start = (ushort *)vc->vc_pos;
2272                         myx = vc->vc_x;
2273                         if (c == 10 || c == 13)
2274                                 continue;
2275                 }
2276                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2277                 cnt++;
2278                 if (myx == vc->vc_cols - 1) {
2279                         vc->vc_need_wrap = 1;
2280                         continue;
2281                 }
2282                 vc->vc_pos += 2;
2283                 myx++;
2284         }
2285         if (cnt > 0) {
2286                 if (CON_IS_VISIBLE(vc))
2287                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2288                 vc->vc_x += cnt;
2289                 if (vc->vc_x == vc->vc_cols) {
2290                         vc->vc_x--;
2291                         vc->vc_need_wrap = 1;
2292                 }
2293         }
2294         set_cursor(vc);
2295
2296 quit:
2297         clear_bit(0, &printing);
2298 }
2299
2300 static struct tty_driver *vt_console_device(struct console *c, int *index)
2301 {
2302         *index = c->index ? c->index-1 : fg_console;
2303         return console_driver;
2304 }
2305
2306 static struct console vt_console_driver = {
2307         .name           = "tty",
2308         .write          = vt_console_print,
2309         .device         = vt_console_device,
2310         .unblank        = unblank_screen,
2311         .flags          = CON_PRINTBUFFER,
2312         .index          = -1,
2313 };
2314 #endif
2315
2316 /*
2317  *      Handling of Linux-specific VC ioctls
2318  */
2319
2320 /*
2321  * Generally a bit racy with respect to console_sem().
2322  *
2323  * There are some functions which don't need it.
2324  *
2325  * There are some functions which can sleep for arbitrary periods
2326  * (paste_selection) but we don't need the lock there anyway.
2327  *
2328  * set_selection has locking, and definitely needs it
2329  */
2330
2331 int tioclinux(struct tty_struct *tty, unsigned long arg)
2332 {
2333         char type, data;
2334         char __user *p = (char __user *)arg;
2335         int lines;
2336         int ret;
2337
2338         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2339                 return -EINVAL;
2340         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2341                 return -EPERM;
2342         if (get_user(type, p))
2343                 return -EFAULT;
2344         ret = 0;
2345         switch (type)
2346         {
2347                 case TIOCL_SETSEL:
2348                         acquire_console_sem();
2349                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2350                         release_console_sem();
2351                         break;
2352                 case TIOCL_PASTESEL:
2353                         ret = paste_selection(tty);
2354                         break;
2355                 case TIOCL_UNBLANKSCREEN:
2356                         acquire_console_sem();
2357                         unblank_screen();
2358                         release_console_sem();
2359                         break;
2360                 case TIOCL_SELLOADLUT:
2361                         ret = sel_loadlut(p);
2362                         break;
2363                 case TIOCL_GETSHIFTSTATE:
2364
2365         /*
2366          * Make it possible to react to Shift+Mousebutton.
2367          * Note that 'shift_state' is an undocumented
2368          * kernel-internal variable; programs not closely
2369          * related to the kernel should not use this.
2370          */
2371                         data = shift_state;
2372                         ret = __put_user(data, p);
2373                         break;
2374                 case TIOCL_GETMOUSEREPORTING:
2375                         data = mouse_reporting();
2376                         ret = __put_user(data, p);
2377                         break;
2378                 case TIOCL_SETVESABLANK:
2379                         set_vesa_blanking(p);
2380                         break;
2381                 case TIOCL_GETKMSGREDIRECT:
2382                         data = kmsg_redirect;
2383                         ret = __put_user(data, p);
2384                         break;
2385                 case TIOCL_SETKMSGREDIRECT:
2386                         if (!capable(CAP_SYS_ADMIN)) {
2387                                 ret = -EPERM;
2388                         } else {
2389                                 if (get_user(data, p+1))
2390                                         ret = -EFAULT;
2391                                 else
2392                                         kmsg_redirect = data;
2393                         }
2394                         break;
2395                 case TIOCL_GETFGCONSOLE:
2396                         ret = fg_console;
2397                         break;
2398                 case TIOCL_SCROLLCONSOLE:
2399                         if (get_user(lines, (s32 __user *)(p+4))) {
2400                                 ret = -EFAULT;
2401                         } else {
2402                                 scrollfront(vc_cons[fg_console].d, lines);
2403                                 ret = 0;
2404                         }
2405                         break;
2406                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2407                         acquire_console_sem();
2408                         ignore_poke = 1;
2409                         do_blank_screen(0);
2410                         release_console_sem();
2411                         break;
2412                 case TIOCL_BLANKEDSCREEN:
2413                         ret = console_blanked;
2414                         break;
2415                 default:
2416                         ret = -EINVAL;
2417                         break;
2418         }
2419         return ret;
2420 }
2421
2422 /*
2423  * /dev/ttyN handling
2424  */
2425
2426 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2427 {
2428         int     retval;
2429
2430         retval = do_con_write(tty, buf, count);
2431         con_flush_chars(tty);
2432
2433         return retval;
2434 }
2435
2436 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2437 {
2438         if (in_interrupt())
2439                 return; /* n_r3964 calls put_char() from interrupt context */
2440         do_con_write(tty, &ch, 1);
2441 }
2442
2443 static int con_write_room(struct tty_struct *tty)
2444 {
2445         if (tty->stopped)
2446                 return 0;
2447         return 4096;            /* No limit, really; we're not buffering */
2448 }
2449
2450 static int con_chars_in_buffer(struct tty_struct *tty)
2451 {
2452         return 0;               /* we're not buffering */
2453 }
2454
2455 /*
2456  * con_throttle and con_unthrottle are only used for
2457  * paste_selection(), which has to stuff in a large number of
2458  * characters...
2459  */
2460 static void con_throttle(struct tty_struct *tty)
2461 {
2462 }
2463
2464 static void con_unthrottle(struct tty_struct *tty)
2465 {
2466         struct vc_data *vc = tty->driver_data;
2467
2468         wake_up_interruptible(&vc->paste_wait);
2469 }
2470
2471 /*
2472  * Turn the Scroll-Lock LED on when the tty is stopped
2473  */
2474 static void con_stop(struct tty_struct *tty)
2475 {
2476         int console_num;
2477         if (!tty)
2478                 return;
2479         console_num = tty->index;
2480         if (!vc_cons_allocated(console_num))
2481                 return;
2482         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2483         set_leds();
2484 }
2485
2486 /*
2487  * Turn the Scroll-Lock LED off when the console is started
2488  */
2489 static void con_start(struct tty_struct *tty)
2490 {
2491         int console_num;
2492         if (!tty)
2493                 return;
2494         console_num = tty->index;
2495         if (!vc_cons_allocated(console_num))
2496                 return;
2497         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2498         set_leds();
2499 }
2500
2501 static void con_flush_chars(struct tty_struct *tty)
2502 {
2503         struct vc_data *vc;
2504
2505         if (in_interrupt())     /* from flush_to_ldisc */
2506                 return;
2507
2508         /* if we race with con_close(), vt may be null */
2509         acquire_console_sem();
2510         vc = tty->driver_data;
2511         if (vc)
2512                 set_cursor(vc);
2513         release_console_sem();
2514 }
2515
2516 /*
2517  * Allocate the console screen memory.
2518  */
2519 static int con_open(struct tty_struct *tty, struct file *filp)
2520 {
2521         unsigned int currcons = tty->index;
2522         int ret = 0;
2523
2524         acquire_console_sem();
2525         if (tty->driver_data == NULL) {
2526                 ret = vc_allocate(currcons);
2527                 if (ret == 0) {
2528                         struct vc_data *vc = vc_cons[currcons].d;
2529                         tty->driver_data = vc;
2530                         vc->vc_tty = tty;
2531
2532                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2533                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2534                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2535                         }
2536                         release_console_sem();
2537                         vcs_make_sysfs(tty);
2538                         return ret;
2539                 }
2540         }
2541         release_console_sem();
2542         return ret;
2543 }
2544
2545 /*
2546  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2547  * and taking a ref against the tty while we're in the process of forgetting
2548  * about it and cleaning things up.
2549  *
2550  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2551  */
2552 static void con_close(struct tty_struct *tty, struct file *filp)
2553 {
2554         mutex_lock(&tty_mutex);
2555         acquire_console_sem();
2556         if (tty && tty->count == 1) {
2557                 struct vc_data *vc = tty->driver_data;
2558
2559                 if (vc)
2560                         vc->vc_tty = NULL;
2561                 tty->driver_data = NULL;
2562                 release_console_sem();
2563                 vcs_remove_sysfs(tty);
2564                 mutex_unlock(&tty_mutex);
2565                 /*
2566                  * tty_mutex is released, but we still hold BKL, so there is
2567                  * still exclusion against init_dev()
2568                  */
2569                 return;
2570         }
2571         release_console_sem();
2572         mutex_unlock(&tty_mutex);
2573 }
2574
2575 static void vc_init(struct vc_data *vc, unsigned int rows,
2576                     unsigned int cols, int do_clear)
2577 {
2578         int j, k ;
2579
2580         vc->vc_cols = cols;
2581         vc->vc_rows = rows;
2582         vc->vc_size_row = cols << 1;
2583         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2584
2585         set_origin(vc);
2586         vc->vc_pos = vc->vc_origin;
2587         reset_vc(vc);
2588         for (j=k=0; j<16; j++) {
2589                 vc->vc_palette[k++] = default_red[j] ;
2590                 vc->vc_palette[k++] = default_grn[j] ;
2591                 vc->vc_palette[k++] = default_blu[j] ;
2592         }
2593         vc->vc_def_color       = 0x07;   /* white */
2594         vc->vc_ulcolor          = 0x0f;   /* bold white */
2595         vc->vc_halfcolor       = 0x08;   /* grey */
2596         init_waitqueue_head(&vc->paste_wait);
2597         reset_terminal(vc, do_clear);
2598 }
2599
2600 /*
2601  * This routine initializes console interrupts, and does nothing
2602  * else. If you want the screen to clear, call tty_write with
2603  * the appropriate escape-sequence.
2604  */
2605
2606 static int __init con_init(void)
2607 {
2608         const char *display_desc = NULL;
2609         struct vc_data *vc;
2610         unsigned int currcons = 0, i;
2611
2612         acquire_console_sem();
2613
2614         if (conswitchp)
2615                 display_desc = conswitchp->con_startup();
2616         if (!display_desc) {
2617                 fg_console = 0;
2618                 release_console_sem();
2619                 return 0;
2620         }
2621
2622         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2623                 struct con_driver *con_driver = &registered_con_driver[i];
2624
2625                 if (con_driver->con == NULL) {
2626                         con_driver->con = conswitchp;
2627                         con_driver->desc = display_desc;
2628                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2629                         con_driver->first = 0;
2630                         con_driver->last = MAX_NR_CONSOLES - 1;
2631                         break;
2632                 }
2633         }
2634
2635         for (i = 0; i < MAX_NR_CONSOLES; i++)
2636                 con_driver_map[i] = conswitchp;
2637
2638         init_timer(&console_timer);
2639         console_timer.function = blank_screen_t;
2640         if (blankinterval) {
2641                 blank_state = blank_normal_wait;
2642                 mod_timer(&console_timer, jiffies + blankinterval);
2643         }
2644
2645         /*
2646          * kmalloc is not running yet - we use the bootmem allocator.
2647          */
2648         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2649                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2650                 visual_init(vc, currcons, 1);
2651                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2652                 vc->vc_kmalloced = 0;
2653                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2654                         currcons || !vc->vc_sw->con_save_screen);
2655         }
2656         currcons = fg_console = 0;
2657         master_display_fg = vc = vc_cons[currcons].d;
2658         set_origin(vc);
2659         save_screen(vc);
2660         gotoxy(vc, vc->vc_x, vc->vc_y);
2661         csi_J(vc, 0);
2662         update_screen(vc);
2663         printk("Console: %s %s %dx%d",
2664                 vc->vc_can_do_color ? "colour" : "mono",
2665                 display_desc, vc->vc_cols, vc->vc_rows);
2666         printable = 1;
2667         printk("\n");
2668
2669         release_console_sem();
2670
2671 #ifdef CONFIG_VT_CONSOLE
2672         register_console(&vt_console_driver);
2673 #endif
2674         return 0;
2675 }
2676 console_initcall(con_init);
2677
2678 static const struct tty_operations con_ops = {
2679         .open = con_open,
2680         .close = con_close,
2681         .write = con_write,
2682         .write_room = con_write_room,
2683         .put_char = con_put_char,
2684         .flush_chars = con_flush_chars,
2685         .chars_in_buffer = con_chars_in_buffer,
2686         .ioctl = vt_ioctl,
2687         .stop = con_stop,
2688         .start = con_start,
2689         .throttle = con_throttle,
2690         .unthrottle = con_unthrottle,
2691 };
2692
2693 int __init vty_init(void)
2694 {
2695         vcs_init();
2696
2697         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2698         if (!console_driver)
2699                 panic("Couldn't allocate console driver\n");
2700         console_driver->owner = THIS_MODULE;
2701         console_driver->name = "tty";
2702         console_driver->name_base = 1;
2703         console_driver->major = TTY_MAJOR;
2704         console_driver->minor_start = 1;
2705         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2706         console_driver->init_termios = tty_std_termios;
2707         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2708         tty_set_operations(console_driver, &con_ops);
2709         if (tty_register_driver(console_driver))
2710                 panic("Couldn't register console driver\n");
2711
2712         kbd_init();
2713         console_map_init();
2714 #ifdef CONFIG_PROM_CONSOLE
2715         prom_con_init();
2716 #endif
2717 #ifdef CONFIG_MDA_CONSOLE
2718         mda_console_init();
2719 #endif
2720         return 0;
2721 }
2722
2723 #ifndef VT_SINGLE_DRIVER
2724 #include <linux/device.h>
2725
2726 static struct class *vtconsole_class;
2727
2728 static int bind_con_driver(const struct consw *csw, int first, int last,
2729                            int deflt)
2730 {
2731         struct module *owner = csw->owner;
2732         const char *desc = NULL;
2733         struct con_driver *con_driver;
2734         int i, j = -1, k = -1, retval = -ENODEV;
2735
2736         if (!try_module_get(owner))
2737                 return -ENODEV;
2738
2739         acquire_console_sem();
2740
2741         /* check if driver is registered */
2742         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2743                 con_driver = &registered_con_driver[i];
2744
2745                 if (con_driver->con == csw) {
2746                         desc = con_driver->desc;
2747                         retval = 0;
2748                         break;
2749                 }
2750         }
2751
2752         if (retval)
2753                 goto err;
2754
2755         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2756                 csw->con_startup();
2757                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2758         }
2759
2760         if (deflt) {
2761                 if (conswitchp)
2762                         module_put(conswitchp->owner);
2763
2764                 __module_get(owner);
2765                 conswitchp = csw;
2766         }
2767
2768         first = max(first, con_driver->first);
2769         last = min(last, con_driver->last);
2770
2771         for (i = first; i <= last; i++) {
2772                 int old_was_color;
2773                 struct vc_data *vc = vc_cons[i].d;
2774
2775                 if (con_driver_map[i])
2776                         module_put(con_driver_map[i]->owner);
2777                 __module_get(owner);
2778                 con_driver_map[i] = csw;
2779
2780                 if (!vc || !vc->vc_sw)
2781                         continue;
2782
2783                 j = i;
2784
2785                 if (CON_IS_VISIBLE(vc)) {
2786                         k = i;
2787                         save_screen(vc);
2788                 }
2789
2790                 old_was_color = vc->vc_can_do_color;
2791                 vc->vc_sw->con_deinit(vc);
2792                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2793                 visual_init(vc, i, 0);
2794                 set_origin(vc);
2795                 update_attr(vc);
2796
2797                 /* If the console changed between mono <-> color, then
2798                  * the attributes in the screenbuf will be wrong.  The
2799                  * following resets all attributes to something sane.
2800                  */
2801                 if (old_was_color != vc->vc_can_do_color)
2802                         clear_buffer_attributes(vc);
2803         }
2804
2805         printk("Console: switching ");
2806         if (!deflt)
2807                 printk("consoles %d-%d ", first+1, last+1);
2808         if (j >= 0) {
2809                 struct vc_data *vc = vc_cons[j].d;
2810
2811                 printk("to %s %s %dx%d\n",
2812                        vc->vc_can_do_color ? "colour" : "mono",
2813                        desc, vc->vc_cols, vc->vc_rows);
2814
2815                 if (k >= 0) {
2816                         vc = vc_cons[k].d;
2817                         update_screen(vc);
2818                 }
2819         } else
2820                 printk("to %s\n", desc);
2821
2822         retval = 0;
2823 err:
2824         release_console_sem();
2825         module_put(owner);
2826         return retval;
2827 };
2828
2829 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2830 static int con_is_graphics(const struct consw *csw, int first, int last)
2831 {
2832         int i, retval = 0;
2833
2834         for (i = first; i <= last; i++) {
2835                 struct vc_data *vc = vc_cons[i].d;
2836
2837                 if (vc && vc->vc_mode == KD_GRAPHICS) {
2838                         retval = 1;
2839                         break;
2840                 }
2841         }
2842
2843         return retval;
2844 }
2845
2846 static int unbind_con_driver(const struct consw *csw, int first, int last,
2847                              int deflt)
2848 {
2849         struct module *owner = csw->owner;
2850         const struct consw *defcsw = NULL;
2851         struct con_driver *con_driver = NULL, *con_back = NULL;
2852         int i, retval = -ENODEV;
2853
2854         if (!try_module_get(owner))
2855                 return -ENODEV;
2856
2857         acquire_console_sem();
2858
2859         /* check if driver is registered and if it is unbindable */
2860         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2861                 con_driver = &registered_con_driver[i];
2862
2863                 if (con_driver->con == csw &&
2864                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
2865                         retval = 0;
2866                         break;
2867                 }
2868         }
2869
2870         if (retval) {
2871                 release_console_sem();
2872                 goto err;
2873         }
2874
2875         retval = -ENODEV;
2876
2877         /* check if backup driver exists */
2878         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2879                 con_back = &registered_con_driver[i];
2880
2881                 if (con_back->con &&
2882                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
2883                         defcsw = con_back->con;
2884                         retval = 0;
2885                         break;
2886                 }
2887         }
2888
2889         if (retval) {
2890                 release_console_sem();
2891                 goto err;
2892         }
2893
2894         if (!con_is_bound(csw)) {
2895                 release_console_sem();
2896                 goto err;
2897         }
2898
2899         first = max(first, con_driver->first);
2900         last = min(last, con_driver->last);
2901
2902         for (i = first; i <= last; i++) {
2903                 if (con_driver_map[i] == csw) {
2904                         module_put(csw->owner);
2905                         con_driver_map[i] = NULL;
2906                 }
2907         }
2908
2909         if (!con_is_bound(defcsw)) {
2910                 const struct consw *defconsw = conswitchp;
2911
2912                 defcsw->con_startup();
2913                 con_back->flag |= CON_DRIVER_FLAG_INIT;
2914                 /*
2915                  * vgacon may change the default driver to point
2916                  * to dummycon, we restore it here...
2917                  */
2918                 conswitchp = defconsw;
2919         }
2920
2921         if (!con_is_bound(csw))
2922                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
2923
2924         release_console_sem();
2925         /* ignore return value, binding should not fail */
2926         bind_con_driver(defcsw, first, last, deflt);
2927 err:
2928         module_put(owner);
2929         return retval;
2930
2931 }
2932
2933 static int vt_bind(struct con_driver *con)
2934 {
2935         const struct consw *defcsw = NULL, *csw = NULL;
2936         int i, more = 1, first = -1, last = -1, deflt = 0;
2937
2938         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2939             con_is_graphics(con->con, con->first, con->last))
2940                 goto err;
2941
2942         csw = con->con;
2943
2944         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2945                 struct con_driver *con = &registered_con_driver[i];
2946
2947                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
2948                         defcsw = con->con;
2949                         break;
2950                 }
2951         }
2952
2953         if (!defcsw)
2954                 goto err;
2955
2956         while (more) {
2957                 more = 0;
2958
2959                 for (i = con->first; i <= con->last; i++) {
2960                         if (con_driver_map[i] == defcsw) {
2961                                 if (first == -1)
2962                                         first = i;
2963                                 last = i;
2964                                 more = 1;
2965                         } else if (first != -1)
2966                                 break;
2967                 }
2968
2969                 if (first == 0 && last == MAX_NR_CONSOLES -1)
2970                         deflt = 1;
2971
2972                 if (first != -1)
2973                         bind_con_driver(csw, first, last, deflt);
2974
2975                 first = -1;
2976                 last = -1;
2977                 deflt = 0;
2978         }
2979
2980 err:
2981         return 0;
2982 }
2983
2984 static int vt_unbind(struct con_driver *con)
2985 {
2986         const struct consw *csw = NULL;
2987         int i, more = 1, first = -1, last = -1, deflt = 0;
2988
2989         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2990             con_is_graphics(con->con, con->first, con->last))
2991                 goto err;
2992
2993         csw = con->con;
2994
2995         while (more) {
2996                 more = 0;
2997
2998                 for (i = con->first; i <= con->last; i++) {
2999                         if (con_driver_map[i] == csw) {
3000                                 if (first == -1)
3001                                         first = i;
3002                                 last = i;
3003                                 more = 1;
3004                         } else if (first != -1)
3005                                 break;
3006                 }
3007
3008                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3009                         deflt = 1;
3010
3011                 if (first != -1)
3012                         unbind_con_driver(csw, first, last, deflt);
3013
3014                 first = -1;
3015                 last = -1;
3016                 deflt = 0;
3017         }
3018
3019 err:
3020         return 0;
3021 }
3022 #else
3023 static inline int vt_bind(struct con_driver *con)
3024 {
3025         return 0;
3026 }
3027 static inline int vt_unbind(struct con_driver *con)
3028 {
3029         return 0;
3030 }
3031 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3032
3033 static ssize_t store_bind(struct class_device *class_device,
3034                           const char *buf, size_t count)
3035 {
3036         struct con_driver *con = class_get_devdata(class_device);
3037         int bind = simple_strtoul(buf, NULL, 0);
3038
3039         if (bind)
3040                 vt_bind(con);
3041         else
3042                 vt_unbind(con);
3043
3044         return count;
3045 }
3046
3047 static ssize_t show_bind(struct class_device *class_device, char *buf)
3048 {
3049         struct con_driver *con = class_get_devdata(class_device);
3050         int bind = con_is_bound(con->con);
3051
3052         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3053 }
3054
3055 static ssize_t show_name(struct class_device *class_device, char *buf)
3056 {
3057         struct con_driver *con = class_get_devdata(class_device);
3058
3059         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3060                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3061                          con->desc);
3062
3063 }
3064
3065 static struct class_device_attribute class_device_attrs[] = {
3066         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3067         __ATTR(name, S_IRUGO, show_name, NULL),
3068 };
3069
3070 static int vtconsole_init_class_device(struct con_driver *con)
3071 {
3072         int i;
3073
3074         class_set_devdata(con->class_dev, con);
3075         for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
3076                 class_device_create_file(con->class_dev,
3077                                          &class_device_attrs[i]);
3078
3079         return 0;
3080 }
3081
3082 static void vtconsole_deinit_class_device(struct con_driver *con)
3083 {
3084         int i;
3085
3086         for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
3087                 class_device_remove_file(con->class_dev,
3088                                          &class_device_attrs[i]);
3089 }
3090
3091 /**
3092  * con_is_bound - checks if driver is bound to the console
3093  * @csw: console driver
3094  *
3095  * RETURNS: zero if unbound, nonzero if bound
3096  *
3097  * Drivers can call this and if zero, they should release
3098  * all resources allocated on con_startup()
3099  */
3100 int con_is_bound(const struct consw *csw)
3101 {
3102         int i, bound = 0;
3103
3104         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3105                 if (con_driver_map[i] == csw) {
3106                         bound = 1;
3107                         break;
3108                 }
3109         }
3110
3111         return bound;
3112 }
3113 EXPORT_SYMBOL(con_is_bound);
3114
3115 /**
3116  * register_con_driver - register console driver to console layer
3117  * @csw: console driver
3118  * @first: the first console to take over, minimum value is 0
3119  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3120  *
3121  * DESCRIPTION: This function registers a console driver which can later
3122  * bind to a range of consoles specified by @first and @last. It will
3123  * also initialize the console driver by calling con_startup().
3124  */
3125 int register_con_driver(const struct consw *csw, int first, int last)
3126 {
3127         struct module *owner = csw->owner;
3128         struct con_driver *con_driver;
3129         const char *desc;
3130         int i, retval = 0;
3131
3132         if (!try_module_get(owner))
3133                 return -ENODEV;
3134
3135         acquire_console_sem();
3136
3137         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3138                 con_driver = &registered_con_driver[i];
3139
3140                 /* already registered */
3141                 if (con_driver->con == csw)
3142                         retval = -EINVAL;
3143         }
3144
3145         if (retval)
3146                 goto err;
3147
3148         desc = csw->con_startup();
3149
3150         if (!desc)
3151                 goto err;
3152
3153         retval = -EINVAL;
3154
3155         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3156                 con_driver = &registered_con_driver[i];
3157
3158                 if (con_driver->con == NULL) {
3159                         con_driver->con = csw;
3160                         con_driver->desc = desc;
3161                         con_driver->node = i;
3162                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3163                                            CON_DRIVER_FLAG_INIT;
3164                         con_driver->first = first;
3165                         con_driver->last = last;
3166                         retval = 0;
3167                         break;
3168                 }
3169         }
3170
3171         if (retval)
3172                 goto err;
3173
3174         con_driver->class_dev = class_device_create(vtconsole_class, NULL,
3175                                                     MKDEV(0, con_driver->node),
3176                                                     NULL, "vtcon%i",
3177                                                     con_driver->node);
3178
3179         if (IS_ERR(con_driver->class_dev)) {
3180                 printk(KERN_WARNING "Unable to create class_device for %s; "
3181                        "errno = %ld\n", con_driver->desc,
3182                        PTR_ERR(con_driver->class_dev));
3183                 con_driver->class_dev = NULL;
3184         } else {
3185                 vtconsole_init_class_device(con_driver);
3186         }
3187 err:
3188         release_console_sem();
3189         module_put(owner);
3190         return retval;
3191 }
3192 EXPORT_SYMBOL(register_con_driver);
3193
3194 /**
3195  * unregister_con_driver - unregister console driver from console layer
3196  * @csw: console driver
3197  *
3198  * DESCRIPTION: All drivers that registers to the console layer must
3199  * call this function upon exit, or if the console driver is in a state
3200  * where it won't be able to handle console services, such as the
3201  * framebuffer console without loaded framebuffer drivers.
3202  *
3203  * The driver must unbind first prior to unregistration.
3204  */
3205 int unregister_con_driver(const struct consw *csw)
3206 {
3207         int i, retval = -ENODEV;
3208
3209         acquire_console_sem();
3210
3211         /* cannot unregister a bound driver */
3212         if (con_is_bound(csw))
3213                 goto err;
3214
3215         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3216                 struct con_driver *con_driver = &registered_con_driver[i];
3217
3218                 if (con_driver->con == csw &&
3219                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3220                         vtconsole_deinit_class_device(con_driver);
3221                         class_device_destroy(vtconsole_class,
3222                                              MKDEV(0, con_driver->node));
3223                         con_driver->con = NULL;
3224                         con_driver->desc = NULL;
3225                         con_driver->class_dev = NULL;
3226                         con_driver->node = 0;
3227                         con_driver->flag = 0;
3228                         con_driver->first = 0;
3229                         con_driver->last = 0;
3230                         retval = 0;
3231                         break;
3232                 }
3233         }
3234 err:
3235         release_console_sem();
3236         return retval;
3237 }
3238 EXPORT_SYMBOL(unregister_con_driver);
3239
3240 /*
3241  *      If we support more console drivers, this function is used
3242  *      when a driver wants to take over some existing consoles
3243  *      and become default driver for newly opened ones.
3244  *
3245  *      take_over_console is basically a register followed by unbind
3246  */
3247 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3248 {
3249         int err;
3250
3251         err = register_con_driver(csw, first, last);
3252
3253         if (!err)
3254                 bind_con_driver(csw, first, last, deflt);
3255
3256         return err;
3257 }
3258
3259 /*
3260  * give_up_console is a wrapper to unregister_con_driver. It will only
3261  * work if driver is fully unbound.
3262  */
3263 void give_up_console(const struct consw *csw)
3264 {
3265         unregister_con_driver(csw);
3266 }
3267
3268 static int __init vtconsole_class_init(void)
3269 {
3270         int i;
3271
3272         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3273         if (IS_ERR(vtconsole_class)) {
3274                 printk(KERN_WARNING "Unable to create vt console class; "
3275                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3276                 vtconsole_class = NULL;
3277         }
3278
3279         /* Add system drivers to sysfs */
3280         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3281                 struct con_driver *con = &registered_con_driver[i];
3282
3283                 if (con->con && !con->class_dev) {
3284                         con->class_dev =
3285                                 class_device_create(vtconsole_class, NULL,
3286                                                     MKDEV(0, con->node), NULL,
3287                                                     "vtcon%i", con->node);
3288
3289                         if (IS_ERR(con->class_dev)) {
3290                                 printk(KERN_WARNING "Unable to create "
3291                                        "class_device for %s; errno = %ld\n",
3292                                        con->desc, PTR_ERR(con->class_dev));
3293                                 con->class_dev = NULL;
3294                         } else {
3295                                 vtconsole_init_class_device(con);
3296                         }
3297                 }
3298         }
3299
3300         return 0;
3301 }
3302 postcore_initcall(vtconsole_class_init);
3303
3304 #endif
3305
3306 /*
3307  *      Screen blanking
3308  */
3309
3310 static void set_vesa_blanking(char __user *p)
3311 {
3312     unsigned int mode;
3313     get_user(mode, p + 1);
3314     vesa_blank_mode = (mode < 4) ? mode : 0;
3315 }
3316
3317 void do_blank_screen(int entering_gfx)
3318 {
3319         struct vc_data *vc = vc_cons[fg_console].d;
3320         int i;
3321
3322         WARN_CONSOLE_UNLOCKED();
3323
3324         if (console_blanked) {
3325                 if (blank_state == blank_vesa_wait) {
3326                         blank_state = blank_off;
3327                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3328                 }
3329                 return;
3330         }
3331         if (blank_state != blank_normal_wait)
3332                 return;
3333         blank_state = blank_off;
3334
3335         /* entering graphics mode? */
3336         if (entering_gfx) {
3337                 hide_cursor(vc);
3338                 save_screen(vc);
3339                 vc->vc_sw->con_blank(vc, -1, 1);
3340                 console_blanked = fg_console + 1;
3341                 set_origin(vc);
3342                 return;
3343         }
3344
3345         /* don't blank graphics */
3346         if (vc->vc_mode != KD_TEXT) {
3347                 console_blanked = fg_console + 1;
3348                 return;
3349         }
3350
3351         hide_cursor(vc);
3352         del_timer_sync(&console_timer);
3353         blank_timer_expired = 0;
3354
3355         save_screen(vc);
3356         /* In case we need to reset origin, blanking hook returns 1 */
3357         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3358         console_blanked = fg_console + 1;
3359         if (i)
3360                 set_origin(vc);
3361
3362         if (console_blank_hook && console_blank_hook(1))
3363                 return;
3364
3365         if (vesa_off_interval && vesa_blank_mode) {
3366                 blank_state = blank_vesa_wait;
3367                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3368         }
3369 }
3370 EXPORT_SYMBOL(do_blank_screen);
3371
3372 /*
3373  * Called by timer as well as from vt_console_driver
3374  */
3375 void do_unblank_screen(int leaving_gfx)
3376 {
3377         struct vc_data *vc;
3378
3379         /* This should now always be called from a "sane" (read: can schedule)
3380          * context for the sake of the low level drivers, except in the special
3381          * case of oops_in_progress
3382          */
3383         if (!oops_in_progress)
3384                 might_sleep();
3385
3386         WARN_CONSOLE_UNLOCKED();
3387
3388         ignore_poke = 0;
3389         if (!console_blanked)
3390                 return;
3391         if (!vc_cons_allocated(fg_console)) {
3392                 /* impossible */
3393                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3394                 return;
3395         }
3396         vc = vc_cons[fg_console].d;
3397         if (vc->vc_mode != KD_TEXT)
3398                 return; /* but leave console_blanked != 0 */
3399
3400         if (blankinterval) {
3401                 mod_timer(&console_timer, jiffies + blankinterval);
3402                 blank_state = blank_normal_wait;
3403         }
3404
3405         console_blanked = 0;
3406         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3407                 /* Low-level driver cannot restore -> do it ourselves */
3408                 update_screen(vc);
3409         if (console_blank_hook)
3410                 console_blank_hook(0);
3411         set_palette(vc);
3412         set_cursor(vc);
3413 }
3414 EXPORT_SYMBOL(do_unblank_screen);
3415
3416 /*
3417  * This is called by the outside world to cause a forced unblank, mostly for
3418  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3419  * call it with 1 as an argument and so force a mode restore... that may kill
3420  * X or at least garbage the screen but would also make the Oops visible...
3421  */
3422 void unblank_screen(void)
3423 {
3424         do_unblank_screen(0);
3425 }
3426
3427 /*
3428  * We defer the timer blanking to work queue so it can take the console mutex
3429  * (console operations can still happen at irq time, but only from printk which
3430  * has the console mutex. Not perfect yet, but better than no locking
3431  */
3432 static void blank_screen_t(unsigned long dummy)
3433 {
3434         if (unlikely(!keventd_up())) {
3435                 mod_timer(&console_timer, jiffies + blankinterval);
3436                 return;
3437         }
3438         blank_timer_expired = 1;
3439         schedule_work(&console_work);
3440 }
3441
3442 void poke_blanked_console(void)
3443 {
3444         WARN_CONSOLE_UNLOCKED();
3445
3446         /* Add this so we quickly catch whoever might call us in a non
3447          * safe context. Nowadays, unblank_screen() isn't to be called in
3448          * atomic contexts and is allowed to schedule (with the special case
3449          * of oops_in_progress, but that isn't of any concern for this
3450          * function. --BenH.
3451          */
3452         might_sleep();
3453
3454         /* This isn't perfectly race free, but a race here would be mostly harmless,
3455          * at worse, we'll do a spurrious blank and it's unlikely
3456          */
3457         del_timer(&console_timer);
3458         blank_timer_expired = 0;
3459
3460         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3461                 return;
3462         if (console_blanked)
3463                 unblank_screen();
3464         else if (blankinterval) {
3465                 mod_timer(&console_timer, jiffies + blankinterval);
3466                 blank_state = blank_normal_wait;
3467         }
3468 }
3469
3470 /*
3471  *      Palettes
3472  */
3473
3474 static void set_palette(struct vc_data *vc)
3475 {
3476         WARN_CONSOLE_UNLOCKED();
3477
3478         if (vc->vc_mode != KD_GRAPHICS)
3479                 vc->vc_sw->con_set_palette(vc, color_table);
3480 }
3481
3482 static int set_get_cmap(unsigned char __user *arg, int set)
3483 {
3484     int i, j, k;
3485
3486     WARN_CONSOLE_UNLOCKED();
3487
3488     for (i = 0; i < 16; i++)
3489         if (set) {
3490             get_user(default_red[i], arg++);
3491             get_user(default_grn[i], arg++);
3492             get_user(default_blu[i], arg++);
3493         } else {
3494             put_user(default_red[i], arg++);
3495             put_user(default_grn[i], arg++);
3496             put_user(default_blu[i], arg++);
3497         }
3498     if (set) {
3499         for (i = 0; i < MAX_NR_CONSOLES; i++)
3500             if (vc_cons_allocated(i)) {
3501                 for (j = k = 0; j < 16; j++) {
3502                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3503                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3504                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3505                 }
3506                 set_palette(vc_cons[i].d);
3507             }
3508     }
3509     return 0;
3510 }
3511
3512 /*
3513  * Load palette into the DAC registers. arg points to a colour
3514  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3515  */
3516
3517 int con_set_cmap(unsigned char __user *arg)
3518 {
3519         int rc;
3520
3521         acquire_console_sem();
3522         rc = set_get_cmap (arg,1);
3523         release_console_sem();
3524
3525         return rc;
3526 }
3527
3528 int con_get_cmap(unsigned char __user *arg)
3529 {
3530         int rc;
3531
3532         acquire_console_sem();
3533         rc = set_get_cmap (arg,0);
3534         release_console_sem();
3535
3536         return rc;
3537 }
3538
3539 void reset_palette(struct vc_data *vc)
3540 {
3541         int j, k;
3542         for (j=k=0; j<16; j++) {
3543                 vc->vc_palette[k++] = default_red[j];
3544                 vc->vc_palette[k++] = default_grn[j];
3545                 vc->vc_palette[k++] = default_blu[j];
3546         }
3547         set_palette(vc);
3548 }
3549
3550 /*
3551  *  Font switching
3552  *
3553  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3554  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3555  *  depending on width) reserved for each character which is kinda wasty, but
3556  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3557  *  is upto the actual low-level console-driver convert data into its favorite
3558  *  format (maybe we should add a `fontoffset' field to the `display'
3559  *  structure so we won't have to convert the fontdata all the time.
3560  *  /Jes
3561  */
3562
3563 #define max_font_size 65536
3564
3565 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3566 {
3567         struct console_font font;
3568         int rc = -EINVAL;
3569         int c;
3570
3571         if (vc->vc_mode != KD_TEXT)
3572                 return -EINVAL;
3573
3574         if (op->data) {
3575                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3576                 if (!font.data)
3577                         return -ENOMEM;
3578         } else
3579                 font.data = NULL;
3580
3581         acquire_console_sem();
3582         if (vc->vc_sw->con_font_get)
3583                 rc = vc->vc_sw->con_font_get(vc, &font);
3584         else
3585                 rc = -ENOSYS;
3586         release_console_sem();
3587
3588         if (rc)
3589                 goto out;
3590
3591         c = (font.width+7)/8 * 32 * font.charcount;
3592
3593         if (op->data && font.charcount > op->charcount)
3594                 rc = -ENOSPC;
3595         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3596                 if (font.width > op->width || font.height > op->height)
3597                         rc = -ENOSPC;
3598         } else {
3599                 if (font.width != 8)
3600                         rc = -EIO;
3601                 else if ((op->height && font.height > op->height) ||
3602                          font.height > 32)
3603                         rc = -ENOSPC;
3604         }
3605         if (rc)
3606                 goto out;
3607
3608         op->height = font.height;
3609         op->width = font.width;
3610         op->charcount = font.charcount;
3611
3612         if (op->data && copy_to_user(op->data, font.data, c))
3613                 rc = -EFAULT;
3614
3615 out:
3616         kfree(font.data);
3617         return rc;
3618 }
3619
3620 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3621 {
3622         struct console_font font;
3623         int rc = -EINVAL;
3624         int size;
3625
3626         if (vc->vc_mode != KD_TEXT)
3627                 return -EINVAL;
3628         if (!op->data)
3629                 return -EINVAL;
3630         if (op->charcount > 512)
3631                 return -EINVAL;
3632         if (!op->height) {              /* Need to guess font height [compat] */
3633                 int h, i;
3634                 u8 __user *charmap = op->data;
3635                 u8 tmp;
3636
3637                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3638                    so that we can get rid of this soon */
3639                 if (!(op->flags & KD_FONT_FLAG_OLD))
3640                         return -EINVAL;
3641                 for (h = 32; h > 0; h--)
3642                         for (i = 0; i < op->charcount; i++) {
3643                                 if (get_user(tmp, &charmap[32*i+h-1]))
3644                                         return -EFAULT;
3645                                 if (tmp)
3646                                         goto nonzero;
3647                         }
3648                 return -EINVAL;
3649         nonzero:
3650                 op->height = h;
3651         }
3652         if (op->width <= 0 || op->width > 32 || op->height > 32)
3653                 return -EINVAL;
3654         size = (op->width+7)/8 * 32 * op->charcount;
3655         if (size > max_font_size)
3656                 return -ENOSPC;
3657         font.charcount = op->charcount;
3658         font.height = op->height;
3659         font.width = op->width;
3660         font.data = kmalloc(size, GFP_KERNEL);
3661         if (!font.data)
3662                 return -ENOMEM;
3663         if (copy_from_user(font.data, op->data, size)) {
3664                 kfree(font.data);
3665                 return -EFAULT;
3666         }
3667         acquire_console_sem();
3668         if (vc->vc_sw->con_font_set)
3669                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3670         else
3671                 rc = -ENOSYS;
3672         release_console_sem();
3673         kfree(font.data);
3674         return rc;
3675 }
3676
3677 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3678 {
3679         struct console_font font = {.width = op->width, .height = op->height};
3680         char name[MAX_FONT_NAME];
3681         char *s = name;
3682         int rc;
3683
3684         if (vc->vc_mode != KD_TEXT)
3685                 return -EINVAL;
3686
3687         if (!op->data)
3688                 s = NULL;
3689         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3690                 return -EFAULT;
3691         else
3692                 name[MAX_FONT_NAME - 1] = 0;
3693
3694         acquire_console_sem();
3695         if (vc->vc_sw->con_font_default)
3696                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3697         else
3698                 rc = -ENOSYS;
3699         release_console_sem();
3700         if (!rc) {
3701                 op->width = font.width;
3702                 op->height = font.height;
3703         }
3704         return rc;
3705 }
3706
3707 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3708 {
3709         int con = op->height;
3710         int rc;
3711
3712         if (vc->vc_mode != KD_TEXT)
3713                 return -EINVAL;
3714
3715         acquire_console_sem();
3716         if (!vc->vc_sw->con_font_copy)
3717                 rc = -ENOSYS;
3718         else if (con < 0 || !vc_cons_allocated(con))
3719                 rc = -ENOTTY;
3720         else if (con == vc->vc_num)     /* nothing to do */
3721                 rc = 0;
3722         else
3723                 rc = vc->vc_sw->con_font_copy(vc, con);
3724         release_console_sem();
3725         return rc;
3726 }
3727
3728 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3729 {
3730         switch (op->op) {
3731         case KD_FONT_OP_SET:
3732                 return con_font_set(vc, op);
3733         case KD_FONT_OP_GET:
3734                 return con_font_get(vc, op);
3735         case KD_FONT_OP_SET_DEFAULT:
3736                 return con_font_default(vc, op);
3737         case KD_FONT_OP_COPY:
3738                 return con_font_copy(vc, op);
3739         }
3740         return -ENOSYS;
3741 }
3742
3743 /*
3744  *      Interface exported to selection and vcs.
3745  */
3746
3747 /* used by selection */
3748 u16 screen_glyph(struct vc_data *vc, int offset)
3749 {
3750         u16 w = scr_readw(screenpos(vc, offset, 1));
3751         u16 c = w & 0xff;
3752
3753         if (w & vc->vc_hi_font_mask)
3754                 c |= 0x100;
3755         return c;
3756 }
3757
3758 /* used by vcs - note the word offset */
3759 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3760 {
3761         return screenpos(vc, 2 * w_offset, viewed);
3762 }
3763
3764 void getconsxy(struct vc_data *vc, unsigned char *p)
3765 {
3766         p[0] = vc->vc_x;
3767         p[1] = vc->vc_y;
3768 }
3769
3770 void putconsxy(struct vc_data *vc, unsigned char *p)
3771 {
3772         hide_cursor(vc);
3773         gotoxy(vc, p[0], p[1]);
3774         set_cursor(vc);
3775 }
3776
3777 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3778 {
3779         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3780                 return softcursor_original;
3781         return scr_readw(org);
3782 }
3783
3784 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3785 {
3786         scr_writew(val, org);
3787         if ((unsigned long)org == vc->vc_pos) {
3788                 softcursor_original = -1;
3789                 add_softcursor(vc);
3790         }
3791 }
3792
3793 /*
3794  *      Visible symbols for modules
3795  */
3796
3797 EXPORT_SYMBOL(color_table);
3798 EXPORT_SYMBOL(default_red);
3799 EXPORT_SYMBOL(default_grn);
3800 EXPORT_SYMBOL(default_blu);
3801 EXPORT_SYMBOL(update_region);
3802 EXPORT_SYMBOL(redraw_screen);
3803 EXPORT_SYMBOL(vc_resize);
3804 EXPORT_SYMBOL(vc_lock_resize);
3805 EXPORT_SYMBOL(fg_console);
3806 EXPORT_SYMBOL(console_blank_hook);
3807 EXPORT_SYMBOL(console_blanked);
3808 EXPORT_SYMBOL(vc_cons);
3809 #ifndef VT_SINGLE_DRIVER
3810 EXPORT_SYMBOL(take_over_console);
3811 EXPORT_SYMBOL(give_up_console);
3812 #endif