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