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   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/vt_kern.h>
  83 #include <linux/selection.h>
  84 #include <linux/tiocl.h>
  85 #include <linux/kbd_kern.h>
  86 #include <linux/consolemap.h>
  87 #include <linux/timer.h>
  88 #include <linux/interrupt.h>
  89 #include <linux/workqueue.h>
  90 #include <linux/bootmem.h>
  91 #include <linux/pm.h>
  92 #include <linux/font.h>
  93 #include <linux/bitops.h>
  94
  95 #include <asm/io.h>
  96 #include <asm/system.h>
  97 #include <asm/uaccess.h>
  98
  99 #define MAX_NR_CON_DRIVER 16
 100
 101 #define CON_DRIVER_FLAG_MODULE 1
 102 #define CON_DRIVER_FLAG_INIT 2
 103
 104 struct con_driver {
 105         const struct consw *con;
 106         const char *desc;
 107         struct class_device *class_dev;
 108         int node;
 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                 module_put(vc->vc_sw->owner);
 890                 if (vc->vc_kmalloced)
 891                         kfree(vc->vc_screenbuf);
 892                 if (currcons >= MIN_NR_CONSOLES)
 893                         kfree(vc);
 894                 vc_cons[currcons].d = NULL;
 895         }
 896 }
 897
 898 /*
 899  *      VT102 emulator
 900  */
 901
 902 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 903 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 904 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 905
 906 #define decarm          VC_REPEAT
 907 #define decckm          VC_CKMODE
 908 #define kbdapplic       VC_APPLIC
 909 #define lnm             VC_CRLF
 910
 911 /*
 912  * this is what the terminal answers to a ESC-Z or csi0c query.
 913  */
 914 #define VT100ID "\033[?1;2c"
 915 #define VT102ID "\033[?6c"
 916
 917 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
 918                                        8,12,10,14, 9,13,11,15 };
 919
 920 /* the default colour table, for VGA+ colour systems */
 921 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
 922     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
 923 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
 924     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
 925 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
 926     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
 927
 928 /*
 929  * gotoxy() must verify all boundaries, because the arguments
 930  * might also be negative. If the given position is out of
 931  * bounds, the cursor is placed at the nearest margin.
 932  */
 933 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
 934 {
 935         int min_y, max_y;
 936
 937         if (new_x < 0)
 938                 vc->vc_x = 0;
 939         else {
 940                 if (new_x >= vc->vc_cols)
 941                         vc->vc_x = vc->vc_cols - 1;
 942                 else
 943                         vc->vc_x = new_x;
 944         }
 945
 946         if (vc->vc_decom) {
 947                 min_y = vc->vc_top;
 948                 max_y = vc->vc_bottom;
 949         } else {
 950                 min_y = 0;
 951                 max_y = vc->vc_rows;
 952         }
 953         if (new_y < min_y)
 954                 vc->vc_y = min_y;
 955         else if (new_y >= max_y)
 956                 vc->vc_y = max_y - 1;
 957         else
 958                 vc->vc_y = new_y;
 959         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
 960         vc->vc_need_wrap = 0;
 961 }
 962
 963 /* for absolute user moves, when decom is set */
 964 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
 965 {
 966         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
 967 }
 968
 969 void scrollback(struct vc_data *vc, int lines)
 970 {
 971         if (!lines)
 972                 lines = vc->vc_rows / 2;
 973         scrolldelta(-lines);
 974 }
 975
 976 void scrollfront(struct vc_data *vc, int lines)
 977 {
 978         if (!lines)
 979                 lines = vc->vc_rows / 2;
 980         scrolldelta(lines);
 981 }
 982
 983 static void lf(struct vc_data *vc)
 984 {
 985         /* don't scroll if above bottom of scrolling region, or
 986          * if below scrolling region
 987          */
 988         if (vc->vc_y + 1 == vc->vc_bottom)
 989                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
 990         else if (vc->vc_y < vc->vc_rows - 1) {
 991                 vc->vc_y++;
 992                 vc->vc_pos += vc->vc_size_row;
 993         }
 994         vc->vc_need_wrap = 0;
 995 }
 996
 997 static void ri(struct vc_data *vc)
 998 {
 999         /* don't scroll if below top of scrolling region, or
1000          * if above scrolling region
1001          */
1002         if (vc->vc_y == vc->vc_top)
1003                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1004         else if (vc->vc_y > 0) {
1005                 vc->vc_y--;
1006                 vc->vc_pos -= vc->vc_size_row;
1007         }
1008         vc->vc_need_wrap = 0;
1009 }
1010
1011 static inline void cr(struct vc_data *vc)
1012 {
1013         vc->vc_pos -= vc->vc_x << 1;
1014         vc->vc_need_wrap = vc->vc_x = 0;
1015 }
1016
1017 static inline void bs(struct vc_data *vc)
1018 {
1019         if (vc->vc_x) {
1020                 vc->vc_pos -= 2;
1021                 vc->vc_x--;
1022                 vc->vc_need_wrap = 0;
1023         }
1024 }
1025
1026 static inline void del(struct vc_data *vc)
1027 {
1028         /* ignored */
1029 }
1030
1031 static void csi_J(struct vc_data *vc, int vpar)
1032 {
1033         unsigned int count;
1034         unsigned short * start;
1035
1036         switch (vpar) {
1037                 case 0: /* erase from cursor to end of display */
1038                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1039                         start = (unsigned short *)vc->vc_pos;
1040                         if (DO_UPDATE(vc)) {
1041                                 /* do in two stages */
1042                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1043                                               vc->vc_cols - vc->vc_x);
1044                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1045                                               vc->vc_rows - vc->vc_y - 1,
1046                                               vc->vc_cols);
1047                         }
1048                         break;
1049                 case 1: /* erase from start to cursor */
1050                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1051                         start = (unsigned short *)vc->vc_origin;
1052                         if (DO_UPDATE(vc)) {
1053                                 /* do in two stages */
1054                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1055                                               vc->vc_cols);
1056                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1057                                               vc->vc_x + 1);
1058                         }
1059                         break;
1060                 case 2: /* erase whole display */
1061                         count = vc->vc_cols * vc->vc_rows;
1062                         start = (unsigned short *)vc->vc_origin;
1063                         if (DO_UPDATE(vc))
1064                                 vc->vc_sw->con_clear(vc, 0, 0,
1065                                               vc->vc_rows,
1066                                               vc->vc_cols);
1067                         break;
1068                 default:
1069                         return;
1070         }
1071         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1072         vc->vc_need_wrap = 0;
1073 }
1074
1075 static void csi_K(struct vc_data *vc, int vpar)
1076 {
1077         unsigned int count;
1078         unsigned short * start;
1079
1080         switch (vpar) {
1081                 case 0: /* erase from cursor to end of line */
1082                         count = vc->vc_cols - vc->vc_x;
1083                         start = (unsigned short *)vc->vc_pos;
1084                         if (DO_UPDATE(vc))
1085                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1086                                                      vc->vc_cols - vc->vc_x);
1087                         break;
1088                 case 1: /* erase from start of line to cursor */
1089                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1090                         count = vc->vc_x + 1;
1091                         if (DO_UPDATE(vc))
1092                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1093                                                      vc->vc_x + 1);
1094                         break;
1095                 case 2: /* erase whole line */
1096                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1097                         count = vc->vc_cols;
1098                         if (DO_UPDATE(vc))
1099                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1100                                               vc->vc_cols);
1101                         break;
1102                 default:
1103                         return;
1104         }
1105         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1106         vc->vc_need_wrap = 0;
1107 }
1108
1109 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1110 {                                         /* not vt100? */
1111         int count;
1112
1113         if (!vpar)
1114                 vpar++;
1115         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1116
1117         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1118         if (DO_UPDATE(vc))
1119                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1120         vc->vc_need_wrap = 0;
1121 }
1122
1123 static void default_attr(struct vc_data *vc)
1124 {
1125         vc->vc_intensity = 1;
1126         vc->vc_underline = 0;
1127         vc->vc_reverse = 0;
1128         vc->vc_blink = 0;
1129         vc->vc_color = vc->vc_def_color;
1130 }
1131
1132 /* console_sem is held */
1133 static void csi_m(struct vc_data *vc)
1134 {
1135         int i;
1136
1137         for (i = 0; i <= vc->vc_npar; i++)
1138                 switch (vc->vc_par[i]) {
1139                         case 0: /* all attributes off */
1140                                 default_attr(vc);
1141                                 break;
1142                         case 1:
1143                                 vc->vc_intensity = 2;
1144                                 break;
1145                         case 2:
1146                                 vc->vc_intensity = 0;
1147                                 break;
1148                         case 4:
1149                                 vc->vc_underline = 1;
1150                                 break;
1151                         case 5:
1152                                 vc->vc_blink = 1;
1153                                 break;
1154                         case 7:
1155                                 vc->vc_reverse = 1;
1156                                 break;
1157                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1158                                   * Select primary font, don't display
1159                                   * control chars if defined, don't set
1160                                   * bit 8 on output.
1161                                   */
1162                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1163                                                 ? vc->vc_G0_charset
1164                                                 : vc->vc_G1_charset, vc);
1165                                 vc->vc_disp_ctrl = 0;
1166                                 vc->vc_toggle_meta = 0;
1167                                 break;
1168                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1169                                   * Select first alternate font, lets
1170                                   * chars < 32 be displayed as ROM chars.
1171                                   */
1172                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1173                                 vc->vc_disp_ctrl = 1;
1174                                 vc->vc_toggle_meta = 0;
1175                                 break;
1176                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1177                                   * Select second alternate font, toggle
1178                                   * high bit before displaying as ROM char.
1179                                   */
1180                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1181                                 vc->vc_disp_ctrl = 1;
1182                                 vc->vc_toggle_meta = 1;
1183                                 break;
1184                         case 21:
1185                         case 22:
1186                                 vc->vc_intensity = 1;
1187                                 break;
1188                         case 24:
1189                                 vc->vc_underline = 0;
1190                                 break;
1191                         case 25:
1192                                 vc->vc_blink = 0;
1193                                 break;
1194                         case 27:
1195                                 vc->vc_reverse = 0;
1196                                 break;
1197                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1198                                   * Enables underscore, white foreground
1199                                   * with white underscore (Linux - use
1200                                   * default foreground).
1201                                   */
1202                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1203                                 vc->vc_underline = 1;
1204                                 break;
1205                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1206                                   * Disable underline option.
1207                                   * Reset colour to default? It did this
1208                                   * before...
1209                                   */
1210                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1211                                 vc->vc_underline = 0;
1212                                 break;
1213                         case 49:
1214                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1215                                 break;
1216                         default:
1217                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1218                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1219                                                 | (vc->vc_color & 0xf0);
1220                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1221                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1222                                                 | (vc->vc_color & 0x0f);
1223                                 break;
1224                 }
1225         update_attr(vc);
1226 }
1227
1228 static void respond_string(const char *p, struct tty_struct *tty)
1229 {
1230         while (*p) {
1231                 tty_insert_flip_char(tty, *p, 0);
1232                 p++;
1233         }
1234         con_schedule_flip(tty);
1235 }
1236
1237 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1238 {
1239         char buf[40];
1240
1241         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1242         respond_string(buf, tty);
1243 }
1244
1245 static inline void status_report(struct tty_struct *tty)
1246 {
1247         respond_string("\033[0n", tty); /* Terminal ok */
1248 }
1249
1250 static inline void respond_ID(struct tty_struct * tty)
1251 {
1252         respond_string(VT102ID, tty);
1253 }
1254
1255 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1256 {
1257         char buf[8];
1258
1259         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1260                 (char)('!' + mry));
1261         respond_string(buf, tty);
1262 }
1263
1264 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1265 int mouse_reporting(void)
1266 {
1267         return vc_cons[fg_console].d->vc_report_mouse;
1268 }
1269
1270 /* console_sem is held */
1271 static void set_mode(struct vc_data *vc, int on_off)
1272 {
1273         int i;
1274
1275         for (i = 0; i <= vc->vc_npar; i++)
1276                 if (vc->vc_ques) {
1277                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1278                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1279                                 if (on_off)
1280                                         set_kbd(vc, decckm);
1281                                 else
1282                                         clr_kbd(vc, decckm);
1283                                 break;
1284                         case 3: /* 80/132 mode switch unimplemented */
1285                                 vc->vc_deccolm = on_off;
1286 #if 0
1287                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1288                                 /* this alone does not suffice; some user mode
1289                                    utility has to change the hardware regs */
1290 #endif
1291                                 break;
1292                         case 5:                 /* Inverted screen on/off */
1293                                 if (vc->vc_decscnm != on_off) {
1294                                         vc->vc_decscnm = on_off;
1295                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1296                                         update_attr(vc);
1297                                 }
1298                                 break;
1299                         case 6:                 /* Origin relative/absolute */
1300                                 vc->vc_decom = on_off;
1301                                 gotoxay(vc, 0, 0);
1302                                 break;
1303                         case 7:                 /* Autowrap on/off */
1304                                 vc->vc_decawm = on_off;
1305                                 break;
1306                         case 8:                 /* Autorepeat on/off */
1307                                 if (on_off)
1308                                         set_kbd(vc, decarm);
1309                                 else
1310                                         clr_kbd(vc, decarm);
1311                                 break;
1312                         case 9:
1313                                 vc->vc_report_mouse = on_off ? 1 : 0;
1314                                 break;
1315                         case 25:                /* Cursor on/off */
1316                                 vc->vc_deccm = on_off;
1317                                 break;
1318                         case 1000:
1319                                 vc->vc_report_mouse = on_off ? 2 : 0;
1320                                 break;
1321                         }
1322                 } else {
1323                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1324                         case 3:                 /* Monitor (display ctrls) */
1325                                 vc->vc_disp_ctrl = on_off;
1326                                 break;
1327                         case 4:                 /* Insert Mode on/off */
1328                                 vc->vc_decim = on_off;
1329                                 break;
1330                         case 20:                /* Lf, Enter == CrLf/Lf */
1331                                 if (on_off)
1332                                         set_kbd(vc, lnm);
1333                                 else
1334                                         clr_kbd(vc, lnm);
1335                                 break;
1336                         }
1337                 }
1338 }
1339
1340 /* console_sem is held */
1341 static void setterm_command(struct vc_data *vc)
1342 {
1343         switch(vc->vc_par[0]) {
1344                 case 1: /* set color for underline mode */
1345                         if (vc->vc_can_do_color &&
1346                                         vc->vc_par[1] < 16) {
1347                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1348                                 if (vc->vc_underline)
1349                                         update_attr(vc);
1350                         }
1351                         break;
1352                 case 2: /* set color for half intensity mode */
1353                         if (vc->vc_can_do_color &&
1354                                         vc->vc_par[1] < 16) {
1355                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1356                                 if (vc->vc_intensity == 0)
1357                                         update_attr(vc);
1358                         }
1359                         break;
1360                 case 8: /* store colors as defaults */
1361                         vc->vc_def_color = vc->vc_attr;
1362                         if (vc->vc_hi_font_mask == 0x100)
1363                                 vc->vc_def_color >>= 1;
1364                         default_attr(vc);
1365                         update_attr(vc);
1366                         break;
1367                 case 9: /* set blanking interval */
1368                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1369                         poke_blanked_console();
1370                         break;
1371                 case 10: /* set bell frequency in Hz */
1372                         if (vc->vc_npar >= 1)
1373                                 vc->vc_bell_pitch = vc->vc_par[1];
1374                         else
1375                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1376                         break;
1377                 case 11: /* set bell duration in msec */
1378                         if (vc->vc_npar >= 1)
1379                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1380                                         vc->vc_par[1] * HZ / 1000 : 0;
1381                         else
1382                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1383                         break;
1384                 case 12: /* bring specified console to the front */
1385                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1386                                 set_console(vc->vc_par[1] - 1);
1387                         break;
1388                 case 13: /* unblank the screen */
1389                         poke_blanked_console();
1390                         break;
1391                 case 14: /* set vesa powerdown interval */
1392                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1393                         break;
1394                 case 15: /* activate the previous console */
1395                         set_console(last_console);
1396                         break;
1397         }
1398 }
1399
1400 /* console_sem is held */
1401 static void csi_at(struct vc_data *vc, unsigned int nr)
1402 {
1403         if (nr > vc->vc_cols - vc->vc_x)
1404                 nr = vc->vc_cols - vc->vc_x;
1405         else if (!nr)
1406                 nr = 1;
1407         insert_char(vc, nr);
1408 }
1409
1410 /* console_sem is held */
1411 static void csi_L(struct vc_data *vc, unsigned int nr)
1412 {
1413         if (nr > vc->vc_rows - vc->vc_y)
1414                 nr = vc->vc_rows - vc->vc_y;
1415         else if (!nr)
1416                 nr = 1;
1417         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1418         vc->vc_need_wrap = 0;
1419 }
1420
1421 /* console_sem is held */
1422 static void csi_P(struct vc_data *vc, unsigned int nr)
1423 {
1424         if (nr > vc->vc_cols - vc->vc_x)
1425                 nr = vc->vc_cols - vc->vc_x;
1426         else if (!nr)
1427                 nr = 1;
1428         delete_char(vc, nr);
1429 }
1430
1431 /* console_sem is held */
1432 static void csi_M(struct vc_data *vc, unsigned int nr)
1433 {
1434         if (nr > vc->vc_rows - vc->vc_y)
1435                 nr = vc->vc_rows - vc->vc_y;
1436         else if (!nr)
1437                 nr=1;
1438         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1439         vc->vc_need_wrap = 0;
1440 }
1441
1442 /* console_sem is held (except via vc_init->reset_terminal */
1443 static void save_cur(struct vc_data *vc)
1444 {
1445         vc->vc_saved_x          = vc->vc_x;
1446         vc->vc_saved_y          = vc->vc_y;
1447         vc->vc_s_intensity      = vc->vc_intensity;
1448         vc->vc_s_underline      = vc->vc_underline;
1449         vc->vc_s_blink          = vc->vc_blink;
1450         vc->vc_s_reverse        = vc->vc_reverse;
1451         vc->vc_s_charset        = vc->vc_charset;
1452         vc->vc_s_color          = vc->vc_color;
1453         vc->vc_saved_G0         = vc->vc_G0_charset;
1454         vc->vc_saved_G1         = vc->vc_G1_charset;
1455 }
1456
1457 /* console_sem is held */
1458 static void restore_cur(struct vc_data *vc)
1459 {
1460         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1461         vc->vc_intensity        = vc->vc_s_intensity;
1462         vc->vc_underline        = vc->vc_s_underline;
1463         vc->vc_blink            = vc->vc_s_blink;
1464         vc->vc_reverse          = vc->vc_s_reverse;
1465         vc->vc_charset          = vc->vc_s_charset;
1466         vc->vc_color            = vc->vc_s_color;
1467         vc->vc_G0_charset       = vc->vc_saved_G0;
1468         vc->vc_G1_charset       = vc->vc_saved_G1;
1469         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1470         update_attr(vc);
1471         vc->vc_need_wrap = 0;
1472 }
1473
1474 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1475         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1476         ESpalette };
1477
1478 /* console_sem is held (except via vc_init()) */
1479 static void reset_terminal(struct vc_data *vc, int do_clear)
1480 {
1481         vc->vc_top              = 0;
1482         vc->vc_bottom           = vc->vc_rows;
1483         vc->vc_state            = ESnormal;
1484         vc->vc_ques             = 0;
1485         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1486         vc->vc_G0_charset       = LAT1_MAP;
1487         vc->vc_G1_charset       = GRAF_MAP;
1488         vc->vc_charset          = 0;
1489         vc->vc_need_wrap        = 0;
1490         vc->vc_report_mouse     = 0;
1491         vc->vc_utf              = 0;
1492         vc->vc_utf_count        = 0;
1493
1494         vc->vc_disp_ctrl        = 0;
1495         vc->vc_toggle_meta      = 0;
1496
1497         vc->vc_decscnm          = 0;
1498         vc->vc_decom            = 0;
1499         vc->vc_decawm           = 1;
1500         vc->vc_deccm            = 1;
1501         vc->vc_decim            = 0;
1502
1503         set_kbd(vc, decarm);
1504         clr_kbd(vc, decckm);
1505         clr_kbd(vc, kbdapplic);
1506         clr_kbd(vc, lnm);
1507         kbd_table[vc->vc_num].lockstate = 0;
1508         kbd_table[vc->vc_num].slockstate = 0;
1509         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1510         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1511         /* do not do set_leds here because this causes an endless tasklet loop
1512            when the keyboard hasn't been initialized yet */
1513
1514         vc->vc_cursor_type = CUR_DEFAULT;
1515         vc->vc_complement_mask = vc->vc_s_complement_mask;
1516
1517         default_attr(vc);
1518         update_attr(vc);
1519
1520         vc->vc_tab_stop[0]      = 0x01010100;
1521         vc->vc_tab_stop[1]      =
1522         vc->vc_tab_stop[2]      =
1523         vc->vc_tab_stop[3]      =
1524         vc->vc_tab_stop[4]      = 0x01010101;
1525
1526         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1527         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1528
1529         gotoxy(vc, 0, 0);
1530         save_cur(vc);
1531         if (do_clear)
1532             csi_J(vc, 2);
1533 }
1534
1535 /* console_sem is held */
1536 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1537 {
1538         /*
1539          *  Control characters can be used in the _middle_
1540          *  of an escape sequence.
1541          */
1542         switch (c) {
1543         case 0:
1544                 return;
1545         case 7:
1546                 if (vc->vc_bell_duration)
1547                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1548                 return;
1549         case 8:
1550                 bs(vc);
1551                 return;
1552         case 9:
1553                 vc->vc_pos -= (vc->vc_x << 1);
1554                 while (vc->vc_x < vc->vc_cols - 1) {
1555                         vc->vc_x++;
1556                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1557                                 break;
1558                 }
1559                 vc->vc_pos += (vc->vc_x << 1);
1560                 return;
1561         case 10: case 11: case 12:
1562                 lf(vc);
1563                 if (!is_kbd(vc, lnm))
1564                         return;
1565         case 13:
1566                 cr(vc);
1567                 return;
1568         case 14:
1569                 vc->vc_charset = 1;
1570                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1571                 vc->vc_disp_ctrl = 1;
1572                 return;
1573         case 15:
1574                 vc->vc_charset = 0;
1575                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1576                 vc->vc_disp_ctrl = 0;
1577                 return;
1578         case 24: case 26:
1579                 vc->vc_state = ESnormal;
1580                 return;
1581         case 27:
1582                 vc->vc_state = ESesc;
1583                 return;
1584         case 127:
1585                 del(vc);
1586                 return;
1587         case 128+27:
1588                 vc->vc_state = ESsquare;
1589                 return;
1590         }
1591         switch(vc->vc_state) {
1592         case ESesc:
1593                 vc->vc_state = ESnormal;
1594                 switch (c) {
1595                 case '[':
1596                         vc->vc_state = ESsquare;
1597                         return;
1598                 case ']':
1599                         vc->vc_state = ESnonstd;
1600                         return;
1601                 case '%':
1602                         vc->vc_state = ESpercent;
1603                         return;
1604                 case 'E':
1605                         cr(vc);
1606                         lf(vc);
1607                         return;
1608                 case 'M':
1609                         ri(vc);
1610                         return;
1611                 case 'D':
1612                         lf(vc);
1613                         return;
1614                 case 'H':
1615                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1616                         return;
1617                 case 'Z':
1618                         respond_ID(tty);
1619                         return;
1620                 case '7':
1621                         save_cur(vc);
1622                         return;
1623                 case '8':
1624                         restore_cur(vc);
1625                         return;
1626                 case '(':
1627                         vc->vc_state = ESsetG0;
1628                         return;
1629                 case ')':
1630                         vc->vc_state = ESsetG1;
1631                         return;
1632                 case '#':
1633                         vc->vc_state = EShash;
1634                         return;
1635                 case 'c':
1636                         reset_terminal(vc, 1);
1637                         return;
1638                 case '>':  /* Numeric keypad */
1639                         clr_kbd(vc, kbdapplic);
1640                         return;
1641                 case '=':  /* Appl. keypad */
1642                         set_kbd(vc, kbdapplic);
1643                         return;
1644                 }
1645                 return;
1646         case ESnonstd:
1647                 if (c=='P') {   /* palette escape sequence */
1648                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1649                                 vc->vc_par[vc->vc_npar] = 0;
1650                         vc->vc_npar = 0;
1651                         vc->vc_state = ESpalette;
1652                         return;
1653                 } else if (c=='R') {   /* reset palette */
1654                         reset_palette(vc);
1655                         vc->vc_state = ESnormal;
1656                 } else
1657                         vc->vc_state = ESnormal;
1658                 return;
1659         case ESpalette:
1660                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1661                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1662                         if (vc->vc_npar == 7) {
1663                                 int i = vc->vc_par[0] * 3, j = 1;
1664                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1665                                 vc->vc_palette[i++] += vc->vc_par[j++];
1666                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1667                                 vc->vc_palette[i++] += vc->vc_par[j++];
1668                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1669                                 vc->vc_palette[i] += vc->vc_par[j];
1670                                 set_palette(vc);
1671                                 vc->vc_state = ESnormal;
1672                         }
1673                 } else
1674                         vc->vc_state = ESnormal;
1675                 return;
1676         case ESsquare:
1677                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1678                         vc->vc_par[vc->vc_npar] = 0;
1679                 vc->vc_npar = 0;
1680                 vc->vc_state = ESgetpars;
1681                 if (c == '[') { /* Function key */
1682                         vc->vc_state=ESfunckey;
1683                         return;
1684                 }
1685                 vc->vc_ques = (c == '?');
1686                 if (vc->vc_ques)
1687                         return;
1688         case ESgetpars:
1689                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1690                         vc->vc_npar++;
1691                         return;
1692                 } else if (c>='0' && c<='9') {
1693                         vc->vc_par[vc->vc_npar] *= 10;
1694                         vc->vc_par[vc->vc_npar] += c - '0';
1695                         return;
1696                 } else
1697                         vc->vc_state = ESgotpars;
1698         case ESgotpars:
1699                 vc->vc_state = ESnormal;
1700                 switch(c) {
1701                 case 'h':
1702                         set_mode(vc, 1);
1703                         return;
1704                 case 'l':
1705                         set_mode(vc, 0);
1706                         return;
1707                 case 'c':
1708                         if (vc->vc_ques) {
1709                                 if (vc->vc_par[0])
1710                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1711                                 else
1712                                         vc->vc_cursor_type = CUR_DEFAULT;
1713                                 return;
1714                         }
1715                         break;
1716                 case 'm':
1717                         if (vc->vc_ques) {
1718                                 clear_selection();
1719                                 if (vc->vc_par[0])
1720                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1721                                 else
1722                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1723                                 return;
1724                         }
1725                         break;
1726                 case 'n':
1727                         if (!vc->vc_ques) {
1728                                 if (vc->vc_par[0] == 5)
1729                                         status_report(tty);
1730                                 else if (vc->vc_par[0] == 6)
1731                                         cursor_report(vc, tty);
1732                         }
1733                         return;
1734                 }
1735                 if (vc->vc_ques) {
1736                         vc->vc_ques = 0;
1737                         return;
1738                 }
1739                 switch(c) {
1740                 case 'G': case '`':
1741                         if (vc->vc_par[0])
1742                                 vc->vc_par[0]--;
1743                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1744                         return;
1745                 case 'A':
1746                         if (!vc->vc_par[0])
1747                                 vc->vc_par[0]++;
1748                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1749                         return;
1750                 case 'B': case 'e':
1751                         if (!vc->vc_par[0])
1752                                 vc->vc_par[0]++;
1753                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1754                         return;
1755                 case 'C': case 'a':
1756                         if (!vc->vc_par[0])
1757                                 vc->vc_par[0]++;
1758                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1759                         return;
1760                 case 'D':
1761                         if (!vc->vc_par[0])
1762                                 vc->vc_par[0]++;
1763                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1764                         return;
1765                 case 'E':
1766                         if (!vc->vc_par[0])
1767                                 vc->vc_par[0]++;
1768                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1769                         return;
1770                 case 'F':
1771                         if (!vc->vc_par[0])
1772                                 vc->vc_par[0]++;
1773                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1774                         return;
1775                 case 'd':
1776                         if (vc->vc_par[0])
1777                                 vc->vc_par[0]--;
1778                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1779                         return;
1780                 case 'H': case 'f':
1781                         if (vc->vc_par[0])
1782                                 vc->vc_par[0]--;
1783                         if (vc->vc_par[1])
1784                                 vc->vc_par[1]--;
1785                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1786                         return;
1787                 case 'J':
1788                         csi_J(vc, vc->vc_par[0]);
1789                         return;
1790                 case 'K':
1791                         csi_K(vc, vc->vc_par[0]);
1792                         return;
1793                 case 'L':
1794                         csi_L(vc, vc->vc_par[0]);
1795                         return;
1796                 case 'M':
1797                         csi_M(vc, vc->vc_par[0]);
1798                         return;
1799                 case 'P':
1800                         csi_P(vc, vc->vc_par[0]);
1801                         return;
1802                 case 'c':
1803                         if (!vc->vc_par[0])
1804                                 respond_ID(tty);
1805                         return;
1806                 case 'g':
1807                         if (!vc->vc_par[0])
1808                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1809                         else if (vc->vc_par[0] == 3) {
1810                                 vc->vc_tab_stop[0] =
1811                                         vc->vc_tab_stop[1] =
1812                                         vc->vc_tab_stop[2] =
1813                                         vc->vc_tab_stop[3] =
1814                                         vc->vc_tab_stop[4] = 0;
1815                         }
1816                         return;
1817                 case 'm':
1818                         csi_m(vc);
1819                         return;
1820                 case 'q': /* DECLL - but only 3 leds */
1821                         /* map 0,1,2,3 to 0,1,2,4 */
1822                         if (vc->vc_par[0] < 4)
1823                                 setledstate(kbd_table + vc->vc_num,
1824                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1825                         return;
1826                 case 'r':
1827                         if (!vc->vc_par[0])
1828                                 vc->vc_par[0]++;
1829                         if (!vc->vc_par[1])
1830                                 vc->vc_par[1] = vc->vc_rows;
1831                         /* Minimum allowed region is 2 lines */
1832                         if (vc->vc_par[0] < vc->vc_par[1] &&
1833                             vc->vc_par[1] <= vc->vc_rows) {
1834                                 vc->vc_top = vc->vc_par[0] - 1;
1835                                 vc->vc_bottom = vc->vc_par[1];
1836                                 gotoxay(vc, 0, 0);
1837                         }
1838                         return;
1839                 case 's':
1840                         save_cur(vc);
1841                         return;
1842                 case 'u':
1843                         restore_cur(vc);
1844                         return;
1845                 case 'X':
1846                         csi_X(vc, vc->vc_par[0]);
1847                         return;
1848                 case '@':
1849                         csi_at(vc, vc->vc_par[0]);
1850                         return;
1851                 case ']': /* setterm functions */
1852                         setterm_command(vc);
1853                         return;
1854                 }
1855                 return;
1856         case ESpercent:
1857                 vc->vc_state = ESnormal;
1858                 switch (c) {
1859                 case '@':  /* defined in ISO 2022 */
1860                         vc->vc_utf = 0;
1861                         return;
1862                 case 'G':  /* prelim official escape code */
1863                 case '8':  /* retained for compatibility */
1864                         vc->vc_utf = 1;
1865                         return;
1866                 }
1867                 return;
1868         case ESfunckey:
1869                 vc->vc_state = ESnormal;
1870                 return;
1871         case EShash:
1872                 vc->vc_state = ESnormal;
1873                 if (c == '8') {
1874                         /* DEC screen alignment test. kludge :-) */
1875                         vc->vc_video_erase_char =
1876                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1877                         csi_J(vc, 2);
1878                         vc->vc_video_erase_char =
1879                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1880                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1881                 }
1882                 return;
1883         case ESsetG0:
1884                 if (c == '0')
1885                         vc->vc_G0_charset = GRAF_MAP;
1886                 else if (c == 'B')
1887                         vc->vc_G0_charset = LAT1_MAP;
1888                 else if (c == 'U')
1889                         vc->vc_G0_charset = IBMPC_MAP;
1890                 else if (c == 'K')
1891                         vc->vc_G0_charset = USER_MAP;
1892                 if (vc->vc_charset == 0)
1893                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1894                 vc->vc_state = ESnormal;
1895                 return;
1896         case ESsetG1:
1897                 if (c == '0')
1898                         vc->vc_G1_charset = GRAF_MAP;
1899                 else if (c == 'B')
1900                         vc->vc_G1_charset = LAT1_MAP;
1901                 else if (c == 'U')
1902                         vc->vc_G1_charset = IBMPC_MAP;
1903                 else if (c == 'K')
1904                         vc->vc_G1_charset = USER_MAP;
1905                 if (vc->vc_charset == 1)
1906                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1907                 vc->vc_state = ESnormal;
1908                 return;
1909         default:
1910                 vc->vc_state = ESnormal;
1911         }
1912 }
1913
1914 /* This is a temporary buffer used to prepare a tty console write
1915  * so that we can easily avoid touching user space while holding the
1916  * console spinlock.  It is allocated in con_init and is shared by
1917  * this code and the vc_screen read/write tty calls.
1918  *
1919  * We have to allocate this statically in the kernel data section
1920  * since console_init (and thus con_init) are called before any
1921  * kernel memory allocation is available.
1922  */
1923 char con_buf[CON_BUF_SIZE];
1924 DECLARE_MUTEX(con_buf_sem);
1925
1926 /* acquires console_sem */
1927 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1928 {
1929 #ifdef VT_BUF_VRAM_ONLY
1930 #define FLUSH do { } while(0);
1931 #else
1932 #define FLUSH if (draw_x >= 0) { \
1933         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1934         draw_x = -1; \
1935         }
1936 #endif
1937
1938         int c, tc, ok, n = 0, draw_x = -1;
1939         unsigned int currcons;
1940         unsigned long draw_from = 0, draw_to = 0;
1941         struct vc_data *vc;
1942         u16 himask, charmask;
1943         const unsigned char *orig_buf = NULL;
1944         int orig_count;
1945
1946         if (in_interrupt())
1947                 return count;
1948
1949         might_sleep();
1950
1951         acquire_console_sem();
1952         vc = tty->driver_data;
1953         if (vc == NULL) {
1954                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1955                 release_console_sem();
1956                 return 0;
1957         }
1958
1959         currcons = vc->vc_num;
1960         if (!vc_cons_allocated(currcons)) {
1961             /* could this happen? */
1962             static int error = 0;
1963             if (!error) {
1964                 error = 1;
1965                 printk("con_write: tty %d not allocated\n", currcons+1);
1966             }
1967             release_console_sem();
1968             return 0;
1969         }
1970         release_console_sem();
1971
1972         orig_buf = buf;
1973         orig_count = count;
1974
1975         /* At this point 'buf' is guaranteed to be a kernel buffer
1976          * and therefore no access to userspace (and therefore sleeping)
1977          * will be needed.  The con_buf_sem serializes all tty based
1978          * console rendering and vcs write/read operations.  We hold
1979          * the console spinlock during the entire write.
1980          */
1981
1982         acquire_console_sem();
1983
1984         vc = tty->driver_data;
1985         if (vc == NULL) {
1986                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
1987                 release_console_sem();
1988                 goto out;
1989         }
1990
1991         himask = vc->vc_hi_font_mask;
1992         charmask = himask ? 0x1ff : 0xff;
1993
1994         /* undraw cursor first */
1995         if (IS_FG(vc))
1996                 hide_cursor(vc);
1997
1998         while (!tty->stopped && count) {
1999                 int orig = *buf;
2000                 c = orig;
2001                 buf++;
2002                 n++;
2003                 count--;
2004
2005                 /* Do no translation at all in control states */
2006                 if (vc->vc_state != ESnormal) {
2007                         tc = c;
2008                 } else if (vc->vc_utf) {
2009                     /* Combine UTF-8 into Unicode */
2010                     /* Incomplete characters silently ignored */
2011                     if(c > 0x7f) {
2012                         if (vc->vc_utf_count > 0 && (c & 0xc0) == 0x80) {
2013                                 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2014                                 vc->vc_utf_count--;
2015                                 if (vc->vc_utf_count == 0)
2016                                     tc = c = vc->vc_utf_char;
2017                                 else continue;
2018                         } else {
2019                                 if ((c & 0xe0) == 0xc0) {
2020                                     vc->vc_utf_count = 1;
2021                                     vc->vc_utf_char = (c & 0x1f);
2022                                 } else if ((c & 0xf0) == 0xe0) {
2023                                     vc->vc_utf_count = 2;
2024                                     vc->vc_utf_char = (c & 0x0f);
2025                                 } else if ((c & 0xf8) == 0xf0) {
2026                                     vc->vc_utf_count = 3;
2027                                     vc->vc_utf_char = (c & 0x07);
2028                                 } else if ((c & 0xfc) == 0xf8) {
2029                                     vc->vc_utf_count = 4;
2030                                     vc->vc_utf_char = (c & 0x03);
2031                                 } else if ((c & 0xfe) == 0xfc) {
2032                                     vc->vc_utf_count = 5;
2033                                     vc->vc_utf_char = (c & 0x01);
2034                                 } else
2035                                     vc->vc_utf_count = 0;
2036                                 continue;
2037                               }
2038                     } else {
2039                       tc = c;
2040                       vc->vc_utf_count = 0;
2041                     }
2042                 } else {        /* no utf */
2043                   tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2044                 }
2045
2046                 /* If the original code was a control character we
2047                  * only allow a glyph to be displayed if the code is
2048                  * not normally used (such as for cursor movement) or
2049                  * if the disp_ctrl mode has been explicitly enabled.
2050                  * Certain characters (as given by the CTRL_ALWAYS
2051                  * bitmap) are always displayed as control characters,
2052                  * as the console would be pretty useless without
2053                  * them; to display an arbitrary font position use the
2054                  * direct-to-font zone in UTF-8 mode.
2055                  */
2056                 ok = tc && (c >= 32 ||
2057                             (!vc->vc_utf && !(((vc->vc_disp_ctrl ? CTRL_ALWAYS
2058                                                 : CTRL_ACTION) >> c) & 1)))
2059                         && (c != 127 || vc->vc_disp_ctrl)
2060                         && (c != 128+27);
2061
2062                 if (vc->vc_state == ESnormal && ok) {
2063                         /* Now try to find out how to display it */
2064                         tc = conv_uni_to_pc(vc, tc);
2065                         if ( tc == -4 ) {
2066                                 /* If we got -4 (not found) then see if we have
2067                                    defined a replacement character (U+FFFD) */
2068                                 tc = conv_uni_to_pc(vc, 0xfffd);
2069
2070                                 /* One reason for the -4 can be that we just
2071                                    did a clear_unimap();
2072                                    try at least to show something. */
2073                                 if (tc == -4)
2074                                      tc = c;
2075                         } else if ( tc == -3 ) {
2076                                 /* Bad hash table -- hope for the best */
2077                                 tc = c;
2078                         }
2079                         if (tc & ~charmask)
2080                                 continue; /* Conversion failed */
2081
2082                         if (vc->vc_need_wrap || vc->vc_decim)
2083                                 FLUSH
2084                         if (vc->vc_need_wrap) {
2085                                 cr(vc);
2086                                 lf(vc);
2087                         }
2088                         if (vc->vc_decim)
2089                                 insert_char(vc, 1);
2090                         scr_writew(himask ?
2091                                      ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2092                                      (vc->vc_attr << 8) + tc,
2093                                    (u16 *) vc->vc_pos);
2094                         if (DO_UPDATE(vc) && draw_x < 0) {
2095                                 draw_x = vc->vc_x;
2096                                 draw_from = vc->vc_pos;
2097                         }
2098                         if (vc->vc_x == vc->vc_cols - 1) {
2099                                 vc->vc_need_wrap = vc->vc_decawm;
2100                                 draw_to = vc->vc_pos + 2;
2101                         } else {
2102                                 vc->vc_x++;
2103                                 draw_to = (vc->vc_pos += 2);
2104                         }
2105                         continue;
2106                 }
2107                 FLUSH
2108                 do_con_trol(tty, vc, orig);
2109         }
2110         FLUSH
2111         console_conditional_schedule();
2112         release_console_sem();
2113
2114 out:
2115         return n;
2116 #undef FLUSH
2117 }
2118
2119 /*
2120  * This is the console switching callback.
2121  *
2122  * Doing console switching in a process context allows
2123  * us to do the switches asynchronously (needed when we want
2124  * to switch due to a keyboard interrupt).  Synchronization
2125  * with other console code and prevention of re-entrancy is
2126  * ensured with console_sem.
2127  */
2128 static void console_callback(void *ignored)
2129 {
2130         acquire_console_sem();
2131
2132         if (want_console >= 0) {
2133                 if (want_console != fg_console &&
2134                     vc_cons_allocated(want_console)) {
2135                         hide_cursor(vc_cons[fg_console].d);
2136                         change_console(vc_cons[want_console].d);
2137                         /* we only changed when the console had already
2138                            been allocated - a new console is not created
2139                            in an interrupt routine */
2140                 }
2141                 want_console = -1;
2142         }
2143         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2144                 do_poke_blanked_console = 0;
2145                 poke_blanked_console();
2146         }
2147         if (scrollback_delta) {
2148                 struct vc_data *vc = vc_cons[fg_console].d;
2149                 clear_selection();
2150                 if (vc->vc_mode == KD_TEXT)
2151                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2152                 scrollback_delta = 0;
2153         }
2154         if (blank_timer_expired) {
2155                 do_blank_screen(0);
2156                 blank_timer_expired = 0;
2157         }
2158
2159         release_console_sem();
2160 }
2161
2162 void set_console(int nr)
2163 {
2164         want_console = nr;
2165         schedule_console_callback();
2166 }
2167
2168 struct tty_driver *console_driver;
2169
2170 #ifdef CONFIG_VT_CONSOLE
2171
2172 /*
2173  *      Console on virtual terminal
2174  *
2175  * The console must be locked when we get here.
2176  */
2177
2178 static void vt_console_print(struct console *co, const char *b, unsigned count)
2179 {
2180         struct vc_data *vc = vc_cons[fg_console].d;
2181         unsigned char c;
2182         static unsigned long printing;
2183         const ushort *start;
2184         ushort cnt = 0;
2185         ushort myx;
2186
2187         /* console busy or not yet initialized */
2188         if (!printable || test_and_set_bit(0, &printing))
2189                 return;
2190
2191         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2192                 vc = vc_cons[kmsg_redirect - 1].d;
2193
2194         /* read `x' only after setting currcons properly (otherwise
2195            the `x' macro will read the x of the foreground console). */
2196         myx = vc->vc_x;
2197
2198         if (!vc_cons_allocated(fg_console)) {
2199                 /* impossible */
2200                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2201                 goto quit;
2202         }
2203
2204         if (vc->vc_mode != KD_TEXT)
2205                 goto quit;
2206
2207         /* undraw cursor first */
2208         if (IS_FG(vc))
2209                 hide_cursor(vc);
2210
2211         start = (ushort *)vc->vc_pos;
2212
2213         /* Contrived structure to try to emulate original need_wrap behaviour
2214          * Problems caused when we have need_wrap set on '\n' character */
2215         while (count--) {
2216                 c = *b++;
2217                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2218                         if (cnt > 0) {
2219                                 if (CON_IS_VISIBLE(vc))
2220                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2221                                 vc->vc_x += cnt;
2222                                 if (vc->vc_need_wrap)
2223                                         vc->vc_x--;
2224                                 cnt = 0;
2225                         }
2226                         if (c == 8) {           /* backspace */
2227                                 bs(vc);
2228                                 start = (ushort *)vc->vc_pos;
2229                                 myx = vc->vc_x;
2230                                 continue;
2231                         }
2232                         if (c != 13)
2233                                 lf(vc);
2234                         cr(vc);
2235                         start = (ushort *)vc->vc_pos;
2236                         myx = vc->vc_x;
2237                         if (c == 10 || c == 13)
2238                                 continue;
2239                 }
2240                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2241                 cnt++;
2242                 if (myx == vc->vc_cols - 1) {
2243                         vc->vc_need_wrap = 1;
2244                         continue;
2245                 }
2246                 vc->vc_pos += 2;
2247                 myx++;
2248         }
2249         if (cnt > 0) {
2250                 if (CON_IS_VISIBLE(vc))
2251                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2252                 vc->vc_x += cnt;
2253                 if (vc->vc_x == vc->vc_cols) {
2254                         vc->vc_x--;
2255                         vc->vc_need_wrap = 1;
2256                 }
2257         }
2258         set_cursor(vc);
2259
2260 quit:
2261         clear_bit(0, &printing);
2262 }
2263
2264 static struct tty_driver *vt_console_device(struct console *c, int *index)
2265 {
2266         *index = c->index ? c->index-1 : fg_console;
2267         return console_driver;
2268 }
2269
2270 static struct console vt_console_driver = {
2271         .name           = "tty",
2272         .write          = vt_console_print,
2273         .device         = vt_console_device,
2274         .unblank        = unblank_screen,
2275         .flags          = CON_PRINTBUFFER,
2276         .index          = -1,
2277 };
2278 #endif
2279
2280 /*
2281  *      Handling of Linux-specific VC ioctls
2282  */
2283
2284 /*
2285  * Generally a bit racy with respect to console_sem().
2286  *
2287  * There are some functions which don't need it.
2288  *
2289  * There are some functions which can sleep for arbitrary periods
2290  * (paste_selection) but we don't need the lock there anyway.
2291  *
2292  * set_selection has locking, and definitely needs it
2293  */
2294
2295 int tioclinux(struct tty_struct *tty, unsigned long arg)
2296 {
2297         char type, data;
2298         char __user *p = (char __user *)arg;
2299         int lines;
2300         int ret;
2301
2302         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2303                 return -EINVAL;
2304         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2305                 return -EPERM;
2306         if (get_user(type, p))
2307                 return -EFAULT;
2308         ret = 0;
2309         switch (type)
2310         {
2311                 case TIOCL_SETSEL:
2312                         acquire_console_sem();
2313                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2314                         release_console_sem();
2315                         break;
2316                 case TIOCL_PASTESEL:
2317                         ret = paste_selection(tty);
2318                         break;
2319                 case TIOCL_UNBLANKSCREEN:
2320                         acquire_console_sem();
2321                         unblank_screen();
2322                         release_console_sem();
2323                         break;
2324                 case TIOCL_SELLOADLUT:
2325                         ret = sel_loadlut(p);
2326                         break;
2327                 case TIOCL_GETSHIFTSTATE:
2328
2329         /*
2330          * Make it possible to react to Shift+Mousebutton.
2331          * Note that 'shift_state' is an undocumented
2332          * kernel-internal variable; programs not closely
2333          * related to the kernel should not use this.
2334          */
2335                         data = shift_state;
2336                         ret = __put_user(data, p);
2337                         break;
2338                 case TIOCL_GETMOUSEREPORTING:
2339                         data = mouse_reporting();
2340                         ret = __put_user(data, p);
2341                         break;
2342                 case TIOCL_SETVESABLANK:
2343                         set_vesa_blanking(p);
2344                         break;
2345                 case TIOCL_GETKMSGREDIRECT:
2346                         data = kmsg_redirect;
2347                         ret = __put_user(data, p);
2348                         break;
2349                 case TIOCL_SETKMSGREDIRECT:
2350                         if (!capable(CAP_SYS_ADMIN)) {
2351                                 ret = -EPERM;
2352                         } else {
2353                                 if (get_user(data, p+1))
2354                                         ret = -EFAULT;
2355                                 else
2356                                         kmsg_redirect = data;
2357                         }
2358                         break;
2359                 case TIOCL_GETFGCONSOLE:
2360                         ret = fg_console;
2361                         break;
2362                 case TIOCL_SCROLLCONSOLE:
2363                         if (get_user(lines, (s32 __user *)(p+4))) {
2364                                 ret = -EFAULT;
2365                         } else {
2366                                 scrollfront(vc_cons[fg_console].d, lines);
2367                                 ret = 0;
2368                         }
2369                         break;
2370                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2371                         acquire_console_sem();
2372                         ignore_poke = 1;
2373                         do_blank_screen(0);
2374                         release_console_sem();
2375                         break;
2376                 case TIOCL_BLANKEDSCREEN:
2377                         ret = console_blanked;
2378                         break;
2379                 default:
2380                         ret = -EINVAL;
2381                         break;
2382         }
2383         return ret;
2384 }
2385
2386 /*
2387  * /dev/ttyN handling
2388  */
2389
2390 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2391 {
2392         int     retval;
2393
2394         retval = do_con_write(tty, buf, count);
2395         con_flush_chars(tty);
2396
2397         return retval;
2398 }
2399
2400 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2401 {
2402         if (in_interrupt())
2403                 return; /* n_r3964 calls put_char() from interrupt context */
2404         do_con_write(tty, &ch, 1);
2405 }
2406
2407 static int con_write_room(struct tty_struct *tty)
2408 {
2409         if (tty->stopped)
2410                 return 0;
2411         return 4096;            /* No limit, really; we're not buffering */
2412 }
2413
2414 static int con_chars_in_buffer(struct tty_struct *tty)
2415 {
2416         return 0;               /* we're not buffering */
2417 }
2418
2419 /*
2420  * con_throttle and con_unthrottle are only used for
2421  * paste_selection(), which has to stuff in a large number of
2422  * characters...
2423  */
2424 static void con_throttle(struct tty_struct *tty)
2425 {
2426 }
2427
2428 static void con_unthrottle(struct tty_struct *tty)
2429 {
2430         struct vc_data *vc = tty->driver_data;
2431
2432         wake_up_interruptible(&vc->paste_wait);
2433 }
2434
2435 /*
2436  * Turn the Scroll-Lock LED on when the tty is stopped
2437  */
2438 static void con_stop(struct tty_struct *tty)
2439 {
2440         int console_num;
2441         if (!tty)
2442                 return;
2443         console_num = tty->index;
2444         if (!vc_cons_allocated(console_num))
2445                 return;
2446         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2447         set_leds();
2448 }
2449
2450 /*
2451  * Turn the Scroll-Lock LED off when the console is started
2452  */
2453 static void con_start(struct tty_struct *tty)
2454 {
2455         int console_num;
2456         if (!tty)
2457                 return;
2458         console_num = tty->index;
2459         if (!vc_cons_allocated(console_num))
2460                 return;
2461         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2462         set_leds();
2463 }
2464
2465 static void con_flush_chars(struct tty_struct *tty)
2466 {
2467         struct vc_data *vc;
2468
2469         if (in_interrupt())     /* from flush_to_ldisc */
2470                 return;
2471
2472         /* if we race with con_close(), vt may be null */
2473         acquire_console_sem();
2474         vc = tty->driver_data;
2475         if (vc)
2476                 set_cursor(vc);
2477         release_console_sem();
2478 }
2479
2480 /*
2481  * Allocate the console screen memory.
2482  */
2483 static int con_open(struct tty_struct *tty, struct file *filp)
2484 {
2485         unsigned int currcons = tty->index;
2486         int ret = 0;
2487
2488         acquire_console_sem();
2489         if (tty->driver_data == NULL) {
2490                 ret = vc_allocate(currcons);
2491                 if (ret == 0) {
2492                         struct vc_data *vc = vc_cons[currcons].d;
2493                         tty->driver_data = vc;
2494                         vc->vc_tty = tty;
2495
2496                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2497                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2498                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2499                         }
2500                         release_console_sem();
2501                         vcs_make_devfs(tty);
2502                         return ret;
2503                 }
2504         }
2505         release_console_sem();
2506         return ret;
2507 }
2508
2509 /*
2510  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2511  * and taking a ref against the tty while we're in the process of forgetting
2512  * about it and cleaning things up.
2513  *
2514  * This is because vcs_remove_devfs() can sleep and will drop the BKL.
2515  */
2516 static void con_close(struct tty_struct *tty, struct file *filp)
2517 {
2518         mutex_lock(&tty_mutex);
2519         acquire_console_sem();
2520         if (tty && tty->count == 1) {
2521                 struct vc_data *vc = tty->driver_data;
2522
2523                 if (vc)
2524                         vc->vc_tty = NULL;
2525                 tty->driver_data = NULL;
2526                 release_console_sem();
2527                 vcs_remove_devfs(tty);
2528                 mutex_unlock(&tty_mutex);
2529                 /*
2530                  * tty_mutex is released, but we still hold BKL, so there is
2531                  * still exclusion against init_dev()
2532                  */
2533                 return;
2534         }
2535         release_console_sem();
2536         mutex_unlock(&tty_mutex);
2537 }
2538
2539 static void vc_init(struct vc_data *vc, unsigned int rows,
2540                     unsigned int cols, int do_clear)
2541 {
2542         int j, k ;
2543
2544         vc->vc_cols = cols;
2545         vc->vc_rows = rows;
2546         vc->vc_size_row = cols << 1;
2547         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2548
2549         set_origin(vc);
2550         vc->vc_pos = vc->vc_origin;
2551         reset_vc(vc);
2552         for (j=k=0; j<16; j++) {
2553                 vc->vc_palette[k++] = default_red[j] ;
2554                 vc->vc_palette[k++] = default_grn[j] ;
2555                 vc->vc_palette[k++] = default_blu[j] ;
2556         }
2557         vc->vc_def_color       = 0x07;   /* white */
2558         vc->vc_ulcolor          = 0x0f;   /* bold white */
2559         vc->vc_halfcolor       = 0x08;   /* grey */
2560         init_waitqueue_head(&vc->paste_wait);
2561         reset_terminal(vc, do_clear);
2562 }
2563
2564 /*
2565  * This routine initializes console interrupts, and does nothing
2566  * else. If you want the screen to clear, call tty_write with
2567  * the appropriate escape-sequence.
2568  */
2569
2570 static int __init con_init(void)
2571 {
2572         const char *display_desc = NULL;
2573         struct vc_data *vc;
2574         unsigned int currcons = 0, i;
2575
2576         acquire_console_sem();
2577
2578         if (conswitchp)
2579                 display_desc = conswitchp->con_startup();
2580         if (!display_desc) {
2581                 fg_console = 0;
2582                 release_console_sem();
2583                 return 0;
2584         }
2585
2586         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2587                 struct con_driver *con_driver = &registered_con_driver[i];
2588
2589                 if (con_driver->con == NULL) {
2590                         con_driver->con = conswitchp;
2591                         con_driver->desc = display_desc;
2592                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2593                         con_driver->first = 0;
2594                         con_driver->last = MAX_NR_CONSOLES - 1;
2595                         break;
2596                 }
2597         }
2598
2599         for (i = 0; i < MAX_NR_CONSOLES; i++)
2600                 con_driver_map[i] = conswitchp;
2601
2602         init_timer(&console_timer);
2603         console_timer.function = blank_screen_t;
2604         if (blankinterval) {
2605                 blank_state = blank_normal_wait;
2606                 mod_timer(&console_timer, jiffies + blankinterval);
2607         }
2608
2609         /*
2610          * kmalloc is not running yet - we use the bootmem allocator.
2611          */
2612         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2613                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2614                 visual_init(vc, currcons, 1);
2615                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2616                 vc->vc_kmalloced = 0;
2617                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2618                         currcons || !vc->vc_sw->con_save_screen);
2619         }
2620         currcons = fg_console = 0;
2621         master_display_fg = vc = vc_cons[currcons].d;
2622         set_origin(vc);
2623         save_screen(vc);
2624         gotoxy(vc, vc->vc_x, vc->vc_y);
2625         csi_J(vc, 0);
2626         update_screen(vc);
2627         printk("Console: %s %s %dx%d",
2628                 vc->vc_can_do_color ? "colour" : "mono",
2629                 display_desc, vc->vc_cols, vc->vc_rows);
2630         printable = 1;
2631         printk("\n");
2632
2633         release_console_sem();
2634
2635 #ifdef CONFIG_VT_CONSOLE
2636         register_console(&vt_console_driver);
2637 #endif
2638         return 0;
2639 }
2640 console_initcall(con_init);
2641
2642 static struct tty_operations con_ops = {
2643         .open = con_open,
2644         .close = con_close,
2645         .write = con_write,
2646         .write_room = con_write_room,
2647         .put_char = con_put_char,
2648         .flush_chars = con_flush_chars,
2649         .chars_in_buffer = con_chars_in_buffer,
2650         .ioctl = vt_ioctl,
2651         .stop = con_stop,
2652         .start = con_start,
2653         .throttle = con_throttle,
2654         .unthrottle = con_unthrottle,
2655 };
2656
2657 int __init vty_init(void)
2658 {
2659         vcs_init();
2660
2661         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2662         if (!console_driver)
2663                 panic("Couldn't allocate console driver\n");
2664         console_driver->owner = THIS_MODULE;
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 #include <linux/device.h>
2689
2690 static struct class *vtconsole_class;
2691
2692 static int bind_con_driver(const struct consw *csw, int first, int last,
2693                            int deflt)
2694 {
2695         struct module *owner = csw->owner;
2696         const char *desc = NULL;
2697         struct con_driver *con_driver;
2698         int i, j = -1, k = -1, retval = -ENODEV;
2699
2700         if (!try_module_get(owner))
2701                 return -ENODEV;
2702
2703         acquire_console_sem();
2704
2705         /* check if driver is registered */
2706         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2707                 con_driver = &registered_con_driver[i];
2708
2709                 if (con_driver->con == csw) {
2710                         desc = con_driver->desc;
2711                         retval = 0;
2712                         break;
2713                 }
2714         }
2715
2716         if (retval)
2717                 goto err;
2718
2719         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2720                 csw->con_startup();
2721                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2722         }
2723
2724         if (deflt) {
2725                 if (conswitchp)
2726                         module_put(conswitchp->owner);
2727
2728                 __module_get(owner);
2729                 conswitchp = csw;
2730         }
2731
2732         first = max(first, con_driver->first);
2733         last = min(last, con_driver->last);
2734
2735         for (i = first; i <= last; i++) {
2736                 int old_was_color;
2737                 struct vc_data *vc = vc_cons[i].d;
2738
2739                 if (con_driver_map[i])
2740                         module_put(con_driver_map[i]->owner);
2741                 __module_get(owner);
2742                 con_driver_map[i] = csw;
2743
2744                 if (!vc || !vc->vc_sw)
2745                         continue;
2746
2747                 j = i;
2748
2749                 if (CON_IS_VISIBLE(vc)) {
2750                         k = i;
2751                         save_screen(vc);
2752                 }
2753
2754                 old_was_color = vc->vc_can_do_color;
2755                 vc->vc_sw->con_deinit(vc);
2756                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2757                 visual_init(vc, i, 0);
2758                 set_origin(vc);
2759                 update_attr(vc);
2760
2761                 /* If the console changed between mono <-> color, then
2762                  * the attributes in the screenbuf will be wrong.  The
2763                  * following resets all attributes to something sane.
2764                  */
2765                 if (old_was_color != vc->vc_can_do_color)
2766                         clear_buffer_attributes(vc);
2767         }
2768
2769         printk("Console: switching ");
2770         if (!deflt)
2771                 printk("consoles %d-%d ", first+1, last+1);
2772         if (j >= 0) {
2773                 struct vc_data *vc = vc_cons[j].d;
2774
2775                 printk("to %s %s %dx%d\n",
2776                        vc->vc_can_do_color ? "colour" : "mono",
2777                        desc, vc->vc_cols, vc->vc_rows);
2778
2779                 if (k >= 0) {
2780                         vc = vc_cons[k].d;
2781                         update_screen(vc);
2782                 }
2783         } else
2784                 printk("to %s\n", desc);
2785
2786         retval = 0;
2787 err:
2788         release_console_sem();
2789         module_put(owner);
2790         return retval;
2791 };
2792
2793 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2794 static int con_is_graphics(const struct consw *csw, int first, int last)
2795 {
2796         int i, retval = 0;
2797
2798         for (i = first; i <= last; i++) {
2799                 struct vc_data *vc = vc_cons[i].d;
2800
2801                 if (vc && vc->vc_mode == KD_GRAPHICS) {
2802                         retval = 1;
2803                         break;
2804                 }
2805         }
2806
2807         return retval;
2808 }
2809
2810 static int unbind_con_driver(const struct consw *csw, int first, int last,
2811                              int deflt)
2812 {
2813         struct module *owner = csw->owner;
2814         const struct consw *defcsw = NULL;
2815         struct con_driver *con_driver = NULL, *con_back = NULL;
2816         int i, retval = -ENODEV;
2817
2818         if (!try_module_get(owner))
2819                 return -ENODEV;
2820
2821         acquire_console_sem();
2822
2823         /* check if driver is registered and if it is unbindable */
2824         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2825                 con_driver = &registered_con_driver[i];
2826
2827                 if (con_driver->con == csw &&
2828                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
2829                         retval = 0;
2830                         break;
2831                 }
2832         }
2833
2834         if (retval) {
2835                 release_console_sem();
2836                 goto err;
2837         }
2838
2839         retval = -ENODEV;
2840
2841         /* check if backup driver exists */
2842         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2843                 con_back = &registered_con_driver[i];
2844
2845                 if (con_back->con &&
2846                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
2847                         defcsw = con_back->con;
2848                         retval = 0;
2849                         break;
2850                 }
2851         }
2852
2853         if (retval) {
2854                 release_console_sem();
2855                 goto err;
2856         }
2857
2858         if (!con_is_bound(csw)) {
2859                 release_console_sem();
2860                 goto err;
2861         }
2862
2863         first = max(first, con_driver->first);
2864         last = min(last, con_driver->last);
2865
2866         for (i = first; i <= last; i++) {
2867                 if (con_driver_map[i] == csw) {
2868                         module_put(csw->owner);
2869                         con_driver_map[i] = NULL;
2870                 }
2871         }
2872
2873         if (!con_is_bound(defcsw)) {
2874                 const struct consw *defconsw = conswitchp;
2875
2876                 defcsw->con_startup();
2877                 con_back->flag |= CON_DRIVER_FLAG_INIT;
2878                 /*
2879                  * vgacon may change the default driver to point
2880                  * to dummycon, we restore it here...
2881                  */
2882                 conswitchp = defconsw;
2883         }
2884
2885         if (!con_is_bound(csw))
2886                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
2887
2888         release_console_sem();
2889         /* ignore return value, binding should not fail */
2890         bind_con_driver(defcsw, first, last, deflt);
2891 err:
2892         module_put(owner);
2893         return retval;
2894
2895 }
2896
2897 static int vt_bind(struct con_driver *con)
2898 {
2899         const struct consw *defcsw = NULL, *csw = NULL;
2900         int i, more = 1, first = -1, last = -1, deflt = 0;
2901
2902         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2903             con_is_graphics(con->con, con->first, con->last))
2904                 goto err;
2905
2906         csw = con->con;
2907
2908         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2909                 struct con_driver *con = &registered_con_driver[i];
2910
2911                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
2912                         defcsw = con->con;
2913                         break;
2914                 }
2915         }
2916
2917         if (!defcsw)
2918                 goto err;
2919
2920         while (more) {
2921                 more = 0;
2922
2923                 for (i = con->first; i <= con->last; i++) {
2924                         if (con_driver_map[i] == defcsw) {
2925                                 if (first == -1)
2926                                         first = i;
2927                                 last = i;
2928                                 more = 1;
2929                         } else if (first != -1)
2930                                 break;
2931                 }
2932
2933                 if (first == 0 && last == MAX_NR_CONSOLES -1)
2934                         deflt = 1;
2935
2936                 if (first != -1)
2937                         bind_con_driver(csw, first, last, deflt);
2938
2939                 first = -1;
2940                 last = -1;
2941                 deflt = 0;
2942         }
2943
2944 err:
2945         return 0;
2946 }
2947
2948 static int vt_unbind(struct con_driver *con)
2949 {
2950         const struct consw *csw = NULL;
2951         int i, more = 1, first = -1, last = -1, deflt = 0;
2952
2953         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2954             con_is_graphics(con->con, con->first, con->last))
2955                 goto err;
2956
2957         csw = con->con;
2958
2959         while (more) {
2960                 more = 0;
2961
2962                 for (i = con->first; i <= con->last; i++) {
2963                         if (con_driver_map[i] == csw) {
2964                                 if (first == -1)
2965                                         first = i;
2966                                 last = i;
2967                                 more = 1;
2968                         } else if (first != -1)
2969                                 break;
2970                 }
2971
2972                 if (first == 0 && last == MAX_NR_CONSOLES -1)
2973                         deflt = 1;
2974
2975                 if (first != -1)
2976                         unbind_con_driver(csw, first, last, deflt);
2977
2978                 first = -1;
2979                 last = -1;
2980                 deflt = 0;
2981         }
2982
2983 err:
2984         return 0;
2985 }
2986 #else
2987 static inline int vt_bind(struct con_driver *con)
2988 {
2989         return 0;
2990 }
2991 static inline int vt_unbind(struct con_driver *con)
2992 {
2993         return 0;
2994 }
2995 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
2996
2997 static ssize_t store_bind(struct class_device *class_device,
2998                           const char *buf, size_t count)
2999 {
3000         struct con_driver *con = class_get_devdata(class_device);
3001         int bind = simple_strtoul(buf, NULL, 0);
3002
3003         if (bind)
3004                 vt_bind(con);
3005         else
3006                 vt_unbind(con);
3007
3008         return count;
3009 }
3010
3011 static ssize_t show_bind(struct class_device *class_device, char *buf)
3012 {
3013         struct con_driver *con = class_get_devdata(class_device);
3014         int bind = con_is_bound(con->con);
3015
3016         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3017 }
3018
3019 static ssize_t show_name(struct class_device *class_device, char *buf)
3020 {
3021         struct con_driver *con = class_get_devdata(class_device);
3022
3023         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3024                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3025                          con->desc);
3026
3027 }
3028
3029 static struct class_device_attribute class_device_attrs[] = {
3030         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3031         __ATTR(name, S_IRUGO, show_name, NULL),
3032 };
3033
3034 static int vtconsole_init_class_device(struct con_driver *con)
3035 {
3036         int i;
3037
3038         class_set_devdata(con->class_dev, con);
3039         for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
3040                 class_device_create_file(con->class_dev,
3041                                          &class_device_attrs[i]);
3042
3043         return 0;
3044 }
3045
3046 static void vtconsole_deinit_class_device(struct con_driver *con)
3047 {
3048         int i;
3049
3050         for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
3051                 class_device_remove_file(con->class_dev,
3052                                          &class_device_attrs[i]);
3053 }
3054
3055 /**
3056  * con_is_bound - checks if driver is bound to the console
3057  * @csw: console driver
3058  *
3059  * RETURNS: zero if unbound, nonzero if bound
3060  *
3061  * Drivers can call this and if zero, they should release
3062  * all resources allocated on con_startup()
3063  */
3064 int con_is_bound(const struct consw *csw)
3065 {
3066         int i, bound = 0;
3067
3068         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3069                 if (con_driver_map[i] == csw) {
3070                         bound = 1;
3071                         break;
3072                 }
3073         }
3074
3075         return bound;
3076 }
3077 EXPORT_SYMBOL(con_is_bound);
3078
3079 /**
3080  * register_con_driver - register console driver to console layer
3081  * @csw: console driver
3082  * @first: the first console to take over, minimum value is 0
3083  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3084  *
3085  * DESCRIPTION: This function registers a console driver which can later
3086  * bind to a range of consoles specified by @first and @last. It will
3087  * also initialize the console driver by calling con_startup().
3088  */
3089 int register_con_driver(const struct consw *csw, int first, int last)
3090 {
3091         struct module *owner = csw->owner;
3092         struct con_driver *con_driver;
3093         const char *desc;
3094         int i, retval = 0;
3095
3096         if (!try_module_get(owner))
3097                 return -ENODEV;
3098
3099         acquire_console_sem();
3100
3101         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3102                 con_driver = &registered_con_driver[i];
3103
3104                 /* already registered */
3105                 if (con_driver->con == csw)
3106                         retval = -EINVAL;
3107         }
3108
3109         if (retval)
3110                 goto err;
3111
3112         desc = csw->con_startup();
3113
3114         if (!desc)
3115                 goto err;
3116
3117         retval = -EINVAL;
3118
3119         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3120                 con_driver = &registered_con_driver[i];
3121
3122                 if (con_driver->con == NULL) {
3123                         con_driver->con = csw;
3124                         con_driver->desc = desc;
3125                         con_driver->node = i;
3126                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3127                                            CON_DRIVER_FLAG_INIT;
3128                         con_driver->first = first;
3129                         con_driver->last = last;
3130                         retval = 0;
3131                         break;
3132                 }
3133         }
3134
3135         if (retval)
3136                 goto err;
3137
3138         con_driver->class_dev = class_device_create(vtconsole_class, NULL,
3139                                                     MKDEV(0, con_driver->node),
3140                                                     NULL, "vtcon%i",
3141                                                     con_driver->node);
3142
3143         if (IS_ERR(con_driver->class_dev)) {
3144                 printk(KERN_WARNING "Unable to create class_device for %s; "
3145                        "errno = %ld\n", con_driver->desc,
3146                        PTR_ERR(con_driver->class_dev));
3147                 con_driver->class_dev = NULL;
3148         } else {
3149                 vtconsole_init_class_device(con_driver);
3150         }
3151 err:
3152         release_console_sem();
3153         module_put(owner);
3154         return retval;
3155 }
3156 EXPORT_SYMBOL(register_con_driver);
3157
3158 /**
3159  * unregister_con_driver - unregister console driver from console layer
3160  * @csw: console driver
3161  *
3162  * DESCRIPTION: All drivers that registers to the console layer must
3163  * call this function upon exit, or if the console driver is in a state
3164  * where it won't be able to handle console services, such as the
3165  * framebuffer console without loaded framebuffer drivers.
3166  *
3167  * The driver must unbind first prior to unregistration.
3168  */
3169 int unregister_con_driver(const struct consw *csw)
3170 {
3171         int i, retval = -ENODEV;
3172
3173         acquire_console_sem();
3174
3175         /* cannot unregister a bound driver */
3176         if (con_is_bound(csw))
3177                 goto err;
3178
3179         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3180                 struct con_driver *con_driver = &registered_con_driver[i];
3181
3182                 if (con_driver->con == csw &&
3183                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3184                         vtconsole_deinit_class_device(con_driver);
3185                         class_device_destroy(vtconsole_class,
3186                                              MKDEV(0, con_driver->node));
3187                         con_driver->con = NULL;
3188                         con_driver->desc = NULL;
3189                         con_driver->class_dev = NULL;
3190                         con_driver->node = 0;
3191                         con_driver->flag = 0;
3192                         con_driver->first = 0;
3193                         con_driver->last = 0;
3194                         retval = 0;
3195                         break;
3196                 }
3197         }
3198 err:
3199         release_console_sem();
3200         return retval;
3201 }
3202 EXPORT_SYMBOL(unregister_con_driver);
3203
3204 /*
3205  *      If we support more console drivers, this function is used
3206  *      when a driver wants to take over some existing consoles
3207  *      and become default driver for newly opened ones.
3208  *
3209  *      take_over_console is basically a register followed by unbind
3210  */
3211 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3212 {
3213         int err;
3214
3215         err = register_con_driver(csw, first, last);
3216
3217         if (!err)
3218                 bind_con_driver(csw, first, last, deflt);
3219
3220         return err;
3221 }
3222
3223 /*
3224  * give_up_console is a wrapper to unregister_con_driver. It will only
3225  * work if driver is fully unbound.
3226  */
3227 void give_up_console(const struct consw *csw)
3228 {
3229         unregister_con_driver(csw);
3230 }
3231
3232 static int __init vtconsole_class_init(void)
3233 {
3234         int i;
3235
3236         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3237         if (IS_ERR(vtconsole_class)) {
3238                 printk(KERN_WARNING "Unable to create vt console class; "
3239                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3240                 vtconsole_class = NULL;
3241         }
3242
3243         /* Add system drivers to sysfs */
3244         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3245                 struct con_driver *con = &registered_con_driver[i];
3246
3247                 if (con->con && !con->class_dev) {
3248                         con->class_dev =
3249                                 class_device_create(vtconsole_class, NULL,
3250                                                     MKDEV(0, con->node), NULL,
3251                                                     "vtcon%i", con->node);
3252
3253                         if (IS_ERR(con->class_dev)) {
3254                                 printk(KERN_WARNING "Unable to create "
3255                                        "class_device for %s; errno = %ld\n",
3256                                        con->desc, PTR_ERR(con->class_dev));
3257                                 con->class_dev = NULL;
3258                         } else {
3259                                 vtconsole_init_class_device(con);
3260                         }
3261                 }
3262         }
3263
3264         return 0;
3265 }
3266 postcore_initcall(vtconsole_class_init);
3267
3268 #endif
3269
3270 /*
3271  *      Screen blanking
3272  */
3273
3274 static void set_vesa_blanking(char __user *p)
3275 {
3276     unsigned int mode;
3277     get_user(mode, p + 1);
3278     vesa_blank_mode = (mode < 4) ? mode : 0;
3279 }
3280
3281 void do_blank_screen(int entering_gfx)
3282 {
3283         struct vc_data *vc = vc_cons[fg_console].d;
3284         int i;
3285
3286         WARN_CONSOLE_UNLOCKED();
3287
3288         if (console_blanked) {
3289                 if (blank_state == blank_vesa_wait) {
3290                         blank_state = blank_off;
3291                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3292                 }
3293                 return;
3294         }
3295         if (blank_state != blank_normal_wait)
3296                 return;
3297         blank_state = blank_off;
3298
3299         /* entering graphics mode? */
3300         if (entering_gfx) {
3301                 hide_cursor(vc);
3302                 save_screen(vc);
3303                 vc->vc_sw->con_blank(vc, -1, 1);
3304                 console_blanked = fg_console + 1;
3305                 set_origin(vc);
3306                 return;
3307         }
3308
3309         /* don't blank graphics */
3310         if (vc->vc_mode != KD_TEXT) {
3311                 console_blanked = fg_console + 1;
3312                 return;
3313         }
3314
3315         hide_cursor(vc);
3316         del_timer_sync(&console_timer);
3317         blank_timer_expired = 0;
3318
3319         save_screen(vc);
3320         /* In case we need to reset origin, blanking hook returns 1 */
3321         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3322         console_blanked = fg_console + 1;
3323         if (i)
3324                 set_origin(vc);
3325
3326         if (console_blank_hook && console_blank_hook(1))
3327                 return;
3328
3329         if (vesa_off_interval && vesa_blank_mode) {
3330                 blank_state = blank_vesa_wait;
3331                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3332         }
3333 }
3334 EXPORT_SYMBOL(do_blank_screen);
3335
3336 /*
3337  * Called by timer as well as from vt_console_driver
3338  */
3339 void do_unblank_screen(int leaving_gfx)
3340 {
3341         struct vc_data *vc;
3342
3343         /* This should now always be called from a "sane" (read: can schedule)
3344          * context for the sake of the low level drivers, except in the special
3345          * case of oops_in_progress
3346          */
3347         if (!oops_in_progress)
3348                 might_sleep();
3349
3350         WARN_CONSOLE_UNLOCKED();
3351
3352         ignore_poke = 0;
3353         if (!console_blanked)
3354                 return;
3355         if (!vc_cons_allocated(fg_console)) {
3356                 /* impossible */
3357                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3358                 return;
3359         }
3360         vc = vc_cons[fg_console].d;
3361         if (vc->vc_mode != KD_TEXT)
3362                 return; /* but leave console_blanked != 0 */
3363
3364         if (blankinterval) {
3365                 mod_timer(&console_timer, jiffies + blankinterval);
3366                 blank_state = blank_normal_wait;
3367         }
3368
3369         console_blanked = 0;
3370         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3371                 /* Low-level driver cannot restore -> do it ourselves */
3372                 update_screen(vc);
3373         if (console_blank_hook)
3374                 console_blank_hook(0);
3375         set_palette(vc);
3376         set_cursor(vc);
3377 }
3378 EXPORT_SYMBOL(do_unblank_screen);
3379
3380 /*
3381  * This is called by the outside world to cause a forced unblank, mostly for
3382  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3383  * call it with 1 as an argument and so force a mode restore... that may kill
3384  * X or at least garbage the screen but would also make the Oops visible...
3385  */
3386 void unblank_screen(void)
3387 {
3388         do_unblank_screen(0);
3389 }
3390
3391 /*
3392  * We defer the timer blanking to work queue so it can take the console mutex
3393  * (console operations can still happen at irq time, but only from printk which
3394  * has the console mutex. Not perfect yet, but better than no locking
3395  */
3396 static void blank_screen_t(unsigned long dummy)
3397 {
3398         if (unlikely(!keventd_up())) {
3399                 mod_timer(&console_timer, jiffies + blankinterval);
3400                 return;
3401         }
3402         blank_timer_expired = 1;
3403         schedule_work(&console_work);
3404 }
3405
3406 void poke_blanked_console(void)
3407 {
3408         WARN_CONSOLE_UNLOCKED();
3409
3410         /* Add this so we quickly catch whoever might call us in a non
3411          * safe context. Nowadays, unblank_screen() isn't to be called in
3412          * atomic contexts and is allowed to schedule (with the special case
3413          * of oops_in_progress, but that isn't of any concern for this
3414          * function. --BenH.
3415          */
3416         might_sleep();
3417
3418         /* This isn't perfectly race free, but a race here would be mostly harmless,
3419          * at worse, we'll do a spurrious blank and it's unlikely
3420          */
3421         del_timer(&console_timer);
3422         blank_timer_expired = 0;
3423
3424         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3425                 return;
3426         if (console_blanked)
3427                 unblank_screen();
3428         else if (blankinterval) {
3429                 mod_timer(&console_timer, jiffies + blankinterval);
3430                 blank_state = blank_normal_wait;
3431         }
3432 }
3433
3434 /*
3435  *      Palettes
3436  */
3437
3438 static void set_palette(struct vc_data *vc)
3439 {
3440         WARN_CONSOLE_UNLOCKED();
3441
3442         if (vc->vc_mode != KD_GRAPHICS)
3443                 vc->vc_sw->con_set_palette(vc, color_table);
3444 }
3445
3446 static int set_get_cmap(unsigned char __user *arg, int set)
3447 {
3448     int i, j, k;
3449
3450     WARN_CONSOLE_UNLOCKED();
3451
3452     for (i = 0; i < 16; i++)
3453         if (set) {
3454             get_user(default_red[i], arg++);
3455             get_user(default_grn[i], arg++);
3456             get_user(default_blu[i], arg++);
3457         } else {
3458             put_user(default_red[i], arg++);
3459             put_user(default_grn[i], arg++);
3460             put_user(default_blu[i], arg++);
3461         }
3462     if (set) {
3463         for (i = 0; i < MAX_NR_CONSOLES; i++)
3464             if (vc_cons_allocated(i)) {
3465                 for (j = k = 0; j < 16; j++) {
3466                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3467                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3468                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3469                 }
3470                 set_palette(vc_cons[i].d);
3471             }
3472     }
3473     return 0;
3474 }
3475
3476 /*
3477  * Load palette into the DAC registers. arg points to a colour
3478  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3479  */
3480
3481 int con_set_cmap(unsigned char __user *arg)
3482 {
3483         int rc;
3484
3485         acquire_console_sem();
3486         rc = set_get_cmap (arg,1);
3487         release_console_sem();
3488
3489         return rc;
3490 }
3491
3492 int con_get_cmap(unsigned char __user *arg)
3493 {
3494         int rc;
3495
3496         acquire_console_sem();
3497         rc = set_get_cmap (arg,0);
3498         release_console_sem();
3499
3500         return rc;
3501 }
3502
3503 void reset_palette(struct vc_data *vc)
3504 {
3505         int j, k;
3506         for (j=k=0; j<16; j++) {
3507                 vc->vc_palette[k++] = default_red[j];
3508                 vc->vc_palette[k++] = default_grn[j];
3509                 vc->vc_palette[k++] = default_blu[j];
3510         }
3511         set_palette(vc);
3512 }
3513
3514 /*
3515  *  Font switching
3516  *
3517  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3518  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3519  *  depending on width) reserved for each character which is kinda wasty, but
3520  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3521  *  is upto the actual low-level console-driver convert data into its favorite
3522  *  format (maybe we should add a `fontoffset' field to the `display'
3523  *  structure so we won't have to convert the fontdata all the time.
3524  *  /Jes
3525  */
3526
3527 #define max_font_size 65536
3528
3529 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3530 {
3531         struct console_font font;
3532         int rc = -EINVAL;
3533         int c;
3534
3535         if (vc->vc_mode != KD_TEXT)
3536                 return -EINVAL;
3537
3538         if (op->data) {
3539                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3540                 if (!font.data)
3541                         return -ENOMEM;
3542         } else
3543                 font.data = NULL;
3544
3545         acquire_console_sem();
3546         if (vc->vc_sw->con_font_get)
3547                 rc = vc->vc_sw->con_font_get(vc, &font);
3548         else
3549                 rc = -ENOSYS;
3550         release_console_sem();
3551
3552         if (rc)
3553                 goto out;
3554
3555         c = (font.width+7)/8 * 32 * font.charcount;
3556
3557         if (op->data && font.charcount > op->charcount)
3558                 rc = -ENOSPC;
3559         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3560                 if (font.width > op->width || font.height > op->height)
3561                         rc = -ENOSPC;
3562         } else {
3563                 if (font.width != 8)
3564                         rc = -EIO;
3565                 else if ((op->height && font.height > op->height) ||
3566                          font.height > 32)
3567                         rc = -ENOSPC;
3568         }
3569         if (rc)
3570                 goto out;
3571
3572         op->height = font.height;
3573         op->width = font.width;
3574         op->charcount = font.charcount;
3575
3576         if (op->data && copy_to_user(op->data, font.data, c))
3577                 rc = -EFAULT;
3578
3579 out:
3580         kfree(font.data);
3581         return rc;
3582 }
3583
3584 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3585 {
3586         struct console_font font;
3587         int rc = -EINVAL;
3588         int size;
3589
3590         if (vc->vc_mode != KD_TEXT)
3591                 return -EINVAL;
3592         if (!op->data)
3593                 return -EINVAL;
3594         if (op->charcount > 512)
3595                 return -EINVAL;
3596         if (!op->height) {              /* Need to guess font height [compat] */
3597                 int h, i;
3598                 u8 __user *charmap = op->data;
3599                 u8 tmp;
3600
3601                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3602                    so that we can get rid of this soon */
3603                 if (!(op->flags & KD_FONT_FLAG_OLD))
3604                         return -EINVAL;
3605                 for (h = 32; h > 0; h--)
3606                         for (i = 0; i < op->charcount; i++) {
3607                                 if (get_user(tmp, &charmap[32*i+h-1]))
3608                                         return -EFAULT;
3609                                 if (tmp)
3610                                         goto nonzero;
3611                         }
3612                 return -EINVAL;
3613         nonzero:
3614                 op->height = h;
3615         }
3616         if (op->width <= 0 || op->width > 32 || op->height > 32)
3617                 return -EINVAL;
3618         size = (op->width+7)/8 * 32 * op->charcount;
3619         if (size > max_font_size)
3620                 return -ENOSPC;
3621         font.charcount = op->charcount;
3622         font.height = op->height;
3623         font.width = op->width;
3624         font.data = kmalloc(size, GFP_KERNEL);
3625         if (!font.data)
3626                 return -ENOMEM;
3627         if (copy_from_user(font.data, op->data, size)) {
3628                 kfree(font.data);
3629                 return -EFAULT;
3630         }
3631         acquire_console_sem();
3632         if (vc->vc_sw->con_font_set)
3633                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3634         else
3635                 rc = -ENOSYS;
3636         release_console_sem();
3637         kfree(font.data);
3638         return rc;
3639 }
3640
3641 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3642 {
3643         struct console_font font = {.width = op->width, .height = op->height};
3644         char name[MAX_FONT_NAME];
3645         char *s = name;
3646         int rc;
3647
3648         if (vc->vc_mode != KD_TEXT)
3649                 return -EINVAL;
3650
3651         if (!op->data)
3652                 s = NULL;
3653         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3654                 return -EFAULT;
3655         else
3656                 name[MAX_FONT_NAME - 1] = 0;
3657
3658         acquire_console_sem();
3659         if (vc->vc_sw->con_font_default)
3660                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3661         else
3662                 rc = -ENOSYS;
3663         release_console_sem();
3664         if (!rc) {
3665                 op->width = font.width;
3666                 op->height = font.height;
3667         }
3668         return rc;
3669 }
3670
3671 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3672 {
3673         int con = op->height;
3674         int rc;
3675
3676         if (vc->vc_mode != KD_TEXT)
3677                 return -EINVAL;
3678
3679         acquire_console_sem();
3680         if (!vc->vc_sw->con_font_copy)
3681                 rc = -ENOSYS;
3682         else if (con < 0 || !vc_cons_allocated(con))
3683                 rc = -ENOTTY;
3684         else if (con == vc->vc_num)     /* nothing to do */
3685                 rc = 0;
3686         else
3687                 rc = vc->vc_sw->con_font_copy(vc, con);
3688         release_console_sem();
3689         return rc;
3690 }
3691
3692 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3693 {
3694         switch (op->op) {
3695         case KD_FONT_OP_SET:
3696                 return con_font_set(vc, op);
3697         case KD_FONT_OP_GET:
3698                 return con_font_get(vc, op);
3699         case KD_FONT_OP_SET_DEFAULT:
3700                 return con_font_default(vc, op);
3701         case KD_FONT_OP_COPY:
3702                 return con_font_copy(vc, op);
3703         }
3704         return -ENOSYS;
3705 }
3706
3707 /*
3708  *      Interface exported to selection and vcs.
3709  */
3710
3711 /* used by selection */
3712 u16 screen_glyph(struct vc_data *vc, int offset)
3713 {
3714         u16 w = scr_readw(screenpos(vc, offset, 1));
3715         u16 c = w & 0xff;
3716
3717         if (w & vc->vc_hi_font_mask)
3718                 c |= 0x100;
3719         return c;
3720 }
3721
3722 /* used by vcs - note the word offset */
3723 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3724 {
3725         return screenpos(vc, 2 * w_offset, viewed);
3726 }
3727
3728 void getconsxy(struct vc_data *vc, unsigned char *p)
3729 {
3730         p[0] = vc->vc_x;
3731         p[1] = vc->vc_y;
3732 }
3733
3734 void putconsxy(struct vc_data *vc, unsigned char *p)
3735 {
3736         hide_cursor(vc);
3737         gotoxy(vc, p[0], p[1]);
3738         set_cursor(vc);
3739 }
3740
3741 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3742 {
3743         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3744                 return softcursor_original;
3745         return scr_readw(org);
3746 }
3747
3748 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3749 {
3750         scr_writew(val, org);
3751         if ((unsigned long)org == vc->vc_pos) {
3752                 softcursor_original = -1;
3753                 add_softcursor(vc);
3754         }
3755 }
3756
3757 /*
3758  *      Visible symbols for modules
3759  */
3760
3761 EXPORT_SYMBOL(color_table);
3762 EXPORT_SYMBOL(default_red);
3763 EXPORT_SYMBOL(default_grn);
3764 EXPORT_SYMBOL(default_blu);
3765 EXPORT_SYMBOL(update_region);
3766 EXPORT_SYMBOL(redraw_screen);
3767 EXPORT_SYMBOL(vc_resize);
3768 EXPORT_SYMBOL(fg_console);
3769 EXPORT_SYMBOL(console_blank_hook);
3770 EXPORT_SYMBOL(console_blanked);
3771 EXPORT_SYMBOL(vc_cons);
3772 #ifndef VT_SINGLE_DRIVER
3773 EXPORT_SYMBOL(take_over_console);
3774 EXPORT_SYMBOL(give_up_console);
3775 #endif