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