drivers/char/vt.c

   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton <andrewm@uow.edu.au>
  63  *
  64  * Removed console_lock, enabled interrupts across all console operations
  65  * 13 March 2001, Andrew Morton
  66  */
  67
  68 #include <linux/module.h>
  69 #include <linux/types.h>
  70 #include <linux/sched.h>
  71 #include <linux/tty.h>
  72 #include <linux/tty_flip.h>
  73 #include <linux/kernel.h>
  74 #include <linux/string.h>
  75 #include <linux/errno.h>
  76 #include <linux/kd.h>
  77 #include <linux/slab.h>
  78 #include <linux/major.h>
  79 #include <linux/mm.h>
  80 #include <linux/console.h>
  81 #include <linux/init.h>
  82 #include <linux/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 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 882 {
 883         int rc;
 884
 885         acquire_console_sem();
 886         rc = vc_resize(vc, cols, lines);
 887         release_console_sem();
 888         return rc;
 889 }
 890
 891 void vc_deallocate(unsigned int currcons)
 892 {
 893         WARN_CONSOLE_UNLOCKED();
 894
 895         if (vc_cons_allocated(currcons)) {
 896                 struct vc_data *vc = vc_cons[currcons].d;
 897                 vc->vc_sw->con_deinit(vc);
 898                 module_put(vc->vc_sw->owner);
 899                 if (vc->vc_kmalloced)
 900                         kfree(vc->vc_screenbuf);
 901                 if (currcons >= MIN_NR_CONSOLES)
 902                         kfree(vc);
 903                 vc_cons[currcons].d = NULL;
 904         }
 905 }
 906
 907 /*
 908  *      VT102 emulator
 909  */
 910
 911 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 912 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 913 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 914
 915 #define decarm          VC_REPEAT
 916 #define decckm          VC_CKMODE
 917 #define kbdapplic       VC_APPLIC
 918 #define lnm             VC_CRLF
 919
 920 /*
 921  * this is what the terminal answers to a ESC-Z or csi0c query.
 922  */
 923 #define VT100ID "\033[?1;2c"
 924 #define VT102ID "\033[?6c"
 925
 926 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
 927                                        8,12,10,14, 9,13,11,15 };
 928
 929 /* the default colour table, for VGA+ colour systems */
 930 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
 931     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
 932 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
 933     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
 934 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
 935     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
 936
 937 /*
 938  * gotoxy() must verify all boundaries, because the arguments
 939  * might also be negative. If the given position is out of
 940  * bounds, the cursor is placed at the nearest margin.
 941  */
 942 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
 943 {
 944         int min_y, max_y;
 945
 946         if (new_x < 0)
 947                 vc->vc_x = 0;
 948         else {
 949                 if (new_x >= vc->vc_cols)
 950                         vc->vc_x = vc->vc_cols - 1;
 951                 else
 952                         vc->vc_x = new_x;
 953         }
 954
 955         if (vc->vc_decom) {
 956                 min_y = vc->vc_top;
 957                 max_y = vc->vc_bottom;
 958         } else {
 959                 min_y = 0;
 960                 max_y = vc->vc_rows;
 961         }
 962         if (new_y < min_y)
 963                 vc->vc_y = min_y;
 964         else if (new_y >= max_y)
 965                 vc->vc_y = max_y - 1;
 966         else
 967                 vc->vc_y = new_y;
 968         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
 969         vc->vc_need_wrap = 0;
 970 }
 971
 972 /* for absolute user moves, when decom is set */
 973 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
 974 {
 975         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
 976 }
 977
 978 void scrollback(struct vc_data *vc, int lines)
 979 {
 980         if (!lines)
 981                 lines = vc->vc_rows / 2;
 982         scrolldelta(-lines);
 983 }
 984
 985 void scrollfront(struct vc_data *vc, int lines)
 986 {
 987         if (!lines)
 988                 lines = vc->vc_rows / 2;
 989         scrolldelta(lines);
 990 }
 991
 992 static void lf(struct vc_data *vc)
 993 {
 994         /* don't scroll if above bottom of scrolling region, or
 995          * if below scrolling region
 996          */
 997         if (vc->vc_y + 1 == vc->vc_bottom)
 998                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
 999         else if (vc->vc_y < vc->vc_rows - 1) {
1000                 vc->vc_y++;
1001                 vc->vc_pos += vc->vc_size_row;
1002         }
1003         vc->vc_need_wrap = 0;
1004 }
1005
1006 static void ri(struct vc_data *vc)
1007 {
1008         /* don't scroll if below top of scrolling region, or
1009          * if above scrolling region
1010          */
1011         if (vc->vc_y == vc->vc_top)
1012                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1013         else if (vc->vc_y > 0) {
1014                 vc->vc_y--;
1015                 vc->vc_pos -= vc->vc_size_row;
1016         }
1017         vc->vc_need_wrap = 0;
1018 }
1019
1020 static inline void cr(struct vc_data *vc)
1021 {
1022         vc->vc_pos -= vc->vc_x << 1;
1023         vc->vc_need_wrap = vc->vc_x = 0;
1024 }
1025
1026 static inline void bs(struct vc_data *vc)
1027 {
1028         if (vc->vc_x) {
1029                 vc->vc_pos -= 2;
1030                 vc->vc_x--;
1031                 vc->vc_need_wrap = 0;
1032         }
1033 }
1034
1035 static inline void del(struct vc_data *vc)
1036 {
1037         /* ignored */
1038 }
1039
1040 static void csi_J(struct vc_data *vc, int vpar)
1041 {
1042         unsigned int count;
1043         unsigned short * start;
1044
1045         switch (vpar) {
1046                 case 0: /* erase from cursor to end of display */
1047                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1048                         start = (unsigned short *)vc->vc_pos;
1049                         if (DO_UPDATE(vc)) {
1050                                 /* do in two stages */
1051                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1052                                               vc->vc_cols - vc->vc_x);
1053                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1054                                               vc->vc_rows - vc->vc_y - 1,
1055                                               vc->vc_cols);
1056                         }
1057                         break;
1058                 case 1: /* erase from start to cursor */
1059                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1060                         start = (unsigned short *)vc->vc_origin;
1061                         if (DO_UPDATE(vc)) {
1062                                 /* do in two stages */
1063                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1064                                               vc->vc_cols);
1065                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1066                                               vc->vc_x + 1);
1067                         }
1068                         break;
1069                 case 2: /* erase whole display */
1070                         count = vc->vc_cols * vc->vc_rows;
1071                         start = (unsigned short *)vc->vc_origin;
1072                         if (DO_UPDATE(vc))
1073                                 vc->vc_sw->con_clear(vc, 0, 0,
1074                                               vc->vc_rows,
1075                                               vc->vc_cols);
1076                         break;
1077                 default:
1078                         return;
1079         }
1080         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1081         vc->vc_need_wrap = 0;
1082 }
1083
1084 static void csi_K(struct vc_data *vc, int vpar)
1085 {
1086         unsigned int count;
1087         unsigned short * start;
1088
1089         switch (vpar) {
1090                 case 0: /* erase from cursor to end of line */
1091                         count = vc->vc_cols - vc->vc_x;
1092                         start = (unsigned short *)vc->vc_pos;
1093                         if (DO_UPDATE(vc))
1094                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1095                                                      vc->vc_cols - vc->vc_x);
1096                         break;
1097                 case 1: /* erase from start of line to cursor */
1098                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1099                         count = vc->vc_x + 1;
1100                         if (DO_UPDATE(vc))
1101                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1102                                                      vc->vc_x + 1);
1103                         break;
1104                 case 2: /* erase whole line */
1105                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1106                         count = vc->vc_cols;
1107                         if (DO_UPDATE(vc))
1108                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1109                                               vc->vc_cols);
1110                         break;
1111                 default:
1112                         return;
1113         }
1114         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1115         vc->vc_need_wrap = 0;
1116 }
1117
1118 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1119 {                                         /* not vt100? */
1120         int count;
1121
1122         if (!vpar)
1123                 vpar++;
1124         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1125
1126         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1127         if (DO_UPDATE(vc))
1128                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1129         vc->vc_need_wrap = 0;
1130 }
1131
1132 static void default_attr(struct vc_data *vc)
1133 {
1134         vc->vc_intensity = 1;
1135         vc->vc_underline = 0;
1136         vc->vc_reverse = 0;
1137         vc->vc_blink = 0;
1138         vc->vc_color = vc->vc_def_color;
1139 }
1140
1141 /* console_sem is held */
1142 static void csi_m(struct vc_data *vc)
1143 {
1144         int i;
1145
1146         for (i = 0; i <= vc->vc_npar; i++)
1147                 switch (vc->vc_par[i]) {
1148                         case 0: /* all attributes off */
1149                                 default_attr(vc);
1150                                 break;
1151                         case 1:
1152                                 vc->vc_intensity = 2;
1153                                 break;
1154                         case 2:
1155                                 vc->vc_intensity = 0;
1156                                 break;
1157                         case 4:
1158                                 vc->vc_underline = 1;
1159                                 break;
1160                         case 5:
1161                                 vc->vc_blink = 1;
1162                                 break;
1163                         case 7:
1164                                 vc->vc_reverse = 1;
1165                                 break;
1166                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1167                                   * Select primary font, don't display
1168                                   * control chars if defined, don't set
1169                                   * bit 8 on output.
1170                                   */
1171                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1172                                                 ? vc->vc_G0_charset
1173                                                 : vc->vc_G1_charset, vc);
1174                                 vc->vc_disp_ctrl = 0;
1175                                 vc->vc_toggle_meta = 0;
1176                                 break;
1177                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1178                                   * Select first alternate font, lets
1179                                   * chars < 32 be displayed as ROM chars.
1180                                   */
1181                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1182                                 vc->vc_disp_ctrl = 1;
1183                                 vc->vc_toggle_meta = 0;
1184                                 break;
1185                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1186                                   * Select second alternate font, toggle
1187                                   * high bit before displaying as ROM char.
1188                                   */
1189                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1190                                 vc->vc_disp_ctrl = 1;
1191                                 vc->vc_toggle_meta = 1;
1192                                 break;
1193                         case 21:
1194                         case 22:
1195                                 vc->vc_intensity = 1;
1196                                 break;
1197                         case 24:
1198                                 vc->vc_underline = 0;
1199                                 break;
1200                         case 25:
1201                                 vc->vc_blink = 0;
1202                                 break;
1203                         case 27:
1204                                 vc->vc_reverse = 0;
1205                                 break;
1206                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1207                                   * Enables underscore, white foreground
1208                                   * with white underscore (Linux - use
1209                                   * default foreground).
1210                                   */
1211                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1212                                 vc->vc_underline = 1;
1213                                 break;
1214                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1215                                   * Disable underline option.
1216                                   * Reset colour to default? It did this
1217                                   * before...
1218                                   */
1219                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1220                                 vc->vc_underline = 0;
1221                                 break;
1222                         case 49:
1223                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1224                                 break;
1225                         default:
1226                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1227                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1228                                                 | (vc->vc_color & 0xf0);
1229                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1230                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1231                                                 | (vc->vc_color & 0x0f);
1232                                 break;
1233                 }
1234         update_attr(vc);
1235 }
1236
1237 static void respond_string(const char *p, struct tty_struct *tty)
1238 {
1239         while (*p) {
1240                 tty_insert_flip_char(tty, *p, 0);
1241                 p++;
1242         }
1243         con_schedule_flip(tty);
1244 }
1245
1246 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1247 {
1248         char buf[40];
1249
1250         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1251         respond_string(buf, tty);
1252 }
1253
1254 static inline void status_report(struct tty_struct *tty)
1255 {
1256         respond_string("\033[0n", tty); /* Terminal ok */
1257 }
1258
1259 static inline void respond_ID(struct tty_struct * tty)
1260 {
1261         respond_string(VT102ID, tty);
1262 }
1263
1264 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1265 {
1266         char buf[8];
1267
1268         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1269                 (char)('!' + mry));
1270         respond_string(buf, tty);
1271 }
1272
1273 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1274 int mouse_reporting(void)
1275 {
1276         return vc_cons[fg_console].d->vc_report_mouse;
1277 }
1278
1279 /* console_sem is held */
1280 static void set_mode(struct vc_data *vc, int on_off)
1281 {
1282         int i;
1283
1284         for (i = 0; i <= vc->vc_npar; i++)
1285                 if (vc->vc_ques) {
1286                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1287                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1288                                 if (on_off)
1289                                         set_kbd(vc, decckm);
1290                                 else
1291                                         clr_kbd(vc, decckm);
1292                                 break;
1293                         case 3: /* 80/132 mode switch unimplemented */
1294                                 vc->vc_deccolm = on_off;
1295 #if 0
1296                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1297                                 /* this alone does not suffice; some user mode
1298                                    utility has to change the hardware regs */
1299 #endif
1300                                 break;
1301                         case 5:                 /* Inverted screen on/off */
1302                                 if (vc->vc_decscnm != on_off) {
1303                                         vc->vc_decscnm = on_off;
1304                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1305                                         update_attr(vc);
1306                                 }
1307                                 break;
1308                         case 6:                 /* Origin relative/absolute */
1309                                 vc->vc_decom = on_off;
1310                                 gotoxay(vc, 0, 0);
1311                                 break;
1312                         case 7:                 /* Autowrap on/off */
1313                                 vc->vc_decawm = on_off;
1314                                 break;
1315                         case 8:                 /* Autorepeat on/off */
1316                                 if (on_off)
1317                                         set_kbd(vc, decarm);
1318                                 else
1319                                         clr_kbd(vc, decarm);
1320                                 break;
1321                         case 9:
1322                                 vc->vc_report_mouse = on_off ? 1 : 0;
1323                                 break;
1324                         case 25:                /* Cursor on/off */
1325                                 vc->vc_deccm = on_off;
1326                                 break;
1327                         case 1000:
1328                                 vc->vc_report_mouse = on_off ? 2 : 0;
1329                                 break;
1330                         }
1331                 } else {
1332                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1333                         case 3:                 /* Monitor (display ctrls) */
1334                                 vc->vc_disp_ctrl = on_off;
1335                                 break;
1336                         case 4:                 /* Insert Mode on/off */
1337                                 vc->vc_decim = on_off;
1338                                 break;
1339                         case 20:                /* Lf, Enter == CrLf/Lf */
1340                                 if (on_off)
1341                                         set_kbd(vc, lnm);
1342                                 else
1343                                         clr_kbd(vc, lnm);
1344                                 break;
1345                         }
1346                 }
1347 }
1348
1349 /* console_sem is held */
1350 static void setterm_command(struct vc_data *vc)
1351 {
1352         switch(vc->vc_par[0]) {
1353                 case 1: /* set color for underline mode */
1354                         if (vc->vc_can_do_color &&
1355                                         vc->vc_par[1] < 16) {
1356                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1357                                 if (vc->vc_underline)
1358                                         update_attr(vc);
1359                         }
1360                         break;
1361                 case 2: /* set color for half intensity mode */
1362                         if (vc->vc_can_do_color &&
1363                                         vc->vc_par[1] < 16) {
1364                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1365                                 if (vc->vc_intensity == 0)
1366                                         update_attr(vc);
1367                         }
1368                         break;
1369                 case 8: /* store colors as defaults */
1370                         vc->vc_def_color = vc->vc_attr;
1371                         if (vc->vc_hi_font_mask == 0x100)
1372                                 vc->vc_def_color >>= 1;
1373                         default_attr(vc);
1374                         update_attr(vc);
1375                         break;
1376                 case 9: /* set blanking interval */
1377                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1378                         poke_blanked_console();
1379                         break;
1380                 case 10: /* set bell frequency in Hz */
1381                         if (vc->vc_npar >= 1)
1382                                 vc->vc_bell_pitch = vc->vc_par[1];
1383                         else
1384                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1385                         break;
1386                 case 11: /* set bell duration in msec */
1387                         if (vc->vc_npar >= 1)
1388                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1389                                         vc->vc_par[1] * HZ / 1000 : 0;
1390                         else
1391                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1392                         break;
1393                 case 12: /* bring specified console to the front */
1394                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1395                                 set_console(vc->vc_par[1] - 1);
1396                         break;
1397                 case 13: /* unblank the screen */
1398                         poke_blanked_console();
1399                         break;
1400                 case 14: /* set vesa powerdown interval */
1401                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1402                         break;
1403                 case 15: /* activate the previous console */
1404                         set_console(last_console);
1405                         break;
1406         }
1407 }
1408
1409 /* console_sem is held */
1410 static void csi_at(struct vc_data *vc, unsigned int nr)
1411 {
1412         if (nr > vc->vc_cols - vc->vc_x)
1413                 nr = vc->vc_cols - vc->vc_x;
1414         else if (!nr)
1415                 nr = 1;
1416         insert_char(vc, nr);
1417 }
1418
1419 /* console_sem is held */
1420 static void csi_L(struct vc_data *vc, unsigned int nr)
1421 {
1422         if (nr > vc->vc_rows - vc->vc_y)
1423                 nr = vc->vc_rows - vc->vc_y;
1424         else if (!nr)
1425                 nr = 1;
1426         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1427         vc->vc_need_wrap = 0;
1428 }
1429
1430 /* console_sem is held */
1431 static void csi_P(struct vc_data *vc, unsigned int nr)
1432 {
1433         if (nr > vc->vc_cols - vc->vc_x)
1434                 nr = vc->vc_cols - vc->vc_x;
1435         else if (!nr)
1436                 nr = 1;
1437         delete_char(vc, nr);
1438 }
1439
1440 /* console_sem is held */
1441 static void csi_M(struct vc_data *vc, unsigned int nr)
1442 {
1443         if (nr > vc->vc_rows - vc->vc_y)
1444                 nr = vc->vc_rows - vc->vc_y;
1445         else if (!nr)
1446                 nr=1;
1447         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1448         vc->vc_need_wrap = 0;
1449 }
1450
1451 /* console_sem is held (except via vc_init->reset_terminal */
1452 static void save_cur(struct vc_data *vc)
1453 {
1454         vc->vc_saved_x          = vc->vc_x;
1455         vc->vc_saved_y          = vc->vc_y;
1456         vc->vc_s_intensity      = vc->vc_intensity;
1457         vc->vc_s_underline      = vc->vc_underline;
1458         vc->vc_s_blink          = vc->vc_blink;
1459         vc->vc_s_reverse        = vc->vc_reverse;
1460         vc->vc_s_charset        = vc->vc_charset;
1461         vc->vc_s_color          = vc->vc_color;
1462         vc->vc_saved_G0         = vc->vc_G0_charset;
1463         vc->vc_saved_G1         = vc->vc_G1_charset;
1464 }
1465
1466 /* console_sem is held */
1467 static void restore_cur(struct vc_data *vc)
1468 {
1469         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1470         vc->vc_intensity        = vc->vc_s_intensity;
1471         vc->vc_underline        = vc->vc_s_underline;
1472         vc->vc_blink            = vc->vc_s_blink;
1473         vc->vc_reverse          = vc->vc_s_reverse;
1474         vc->vc_charset          = vc->vc_s_charset;
1475         vc->vc_color            = vc->vc_s_color;
1476         vc->vc_G0_charset       = vc->vc_saved_G0;
1477         vc->vc_G1_charset       = vc->vc_saved_G1;
1478         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1479         update_attr(vc);
1480         vc->vc_need_wrap = 0;
1481 }
1482
1483 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1484         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1485         ESpalette };
1486
1487 /* console_sem is held (except via vc_init()) */
1488 static void reset_terminal(struct vc_data *vc, int do_clear)
1489 {
1490         vc->vc_top              = 0;
1491         vc->vc_bottom           = vc->vc_rows;
1492         vc->vc_state            = ESnormal;
1493         vc->vc_ques             = 0;
1494         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1495         vc->vc_G0_charset       = LAT1_MAP;
1496         vc->vc_G1_charset       = GRAF_MAP;
1497         vc->vc_charset          = 0;
1498         vc->vc_need_wrap        = 0;
1499         vc->vc_report_mouse     = 0;
1500         vc->vc_utf              = 1;
1501         vc->vc_utf_count        = 0;
1502
1503         vc->vc_disp_ctrl        = 0;
1504         vc->vc_toggle_meta      = 0;
1505
1506         vc->vc_decscnm          = 0;
1507         vc->vc_decom            = 0;
1508         vc->vc_decawm           = 1;
1509         vc->vc_deccm            = 1;
1510         vc->vc_decim            = 0;
1511
1512         set_kbd(vc, decarm);
1513         clr_kbd(vc, decckm);
1514         clr_kbd(vc, kbdapplic);
1515         clr_kbd(vc, lnm);
1516         kbd_table[vc->vc_num].lockstate = 0;
1517         kbd_table[vc->vc_num].slockstate = 0;
1518         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1519         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1520         /* do not do set_leds here because this causes an endless tasklet loop
1521            when the keyboard hasn't been initialized yet */
1522
1523         vc->vc_cursor_type = CUR_DEFAULT;
1524         vc->vc_complement_mask = vc->vc_s_complement_mask;
1525
1526         default_attr(vc);
1527         update_attr(vc);
1528
1529         vc->vc_tab_stop[0]      = 0x01010100;
1530         vc->vc_tab_stop[1]      =
1531         vc->vc_tab_stop[2]      =
1532         vc->vc_tab_stop[3]      =
1533         vc->vc_tab_stop[4]      = 0x01010101;
1534
1535         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1536         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1537
1538         gotoxy(vc, 0, 0);
1539         save_cur(vc);
1540         if (do_clear)
1541             csi_J(vc, 2);
1542 }
1543
1544 /* console_sem is held */
1545 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1546 {
1547         /*
1548          *  Control characters can be used in the _middle_
1549          *  of an escape sequence.
1550          */
1551         switch (c) {
1552         case 0:
1553                 return;
1554         case 7:
1555                 if (vc->vc_bell_duration)
1556                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1557                 return;
1558         case 8:
1559                 bs(vc);
1560                 return;
1561         case 9:
1562                 vc->vc_pos -= (vc->vc_x << 1);
1563                 while (vc->vc_x < vc->vc_cols - 1) {
1564                         vc->vc_x++;
1565                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1566                                 break;
1567                 }
1568                 vc->vc_pos += (vc->vc_x << 1);
1569                 return;
1570         case 10: case 11: case 12:
1571                 lf(vc);
1572                 if (!is_kbd(vc, lnm))
1573                         return;
1574         case 13:
1575                 cr(vc);
1576                 return;
1577         case 14:
1578                 vc->vc_charset = 1;
1579                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1580                 vc->vc_disp_ctrl = 1;
1581                 return;
1582         case 15:
1583                 vc->vc_charset = 0;
1584                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1585                 vc->vc_disp_ctrl = 0;
1586                 return;
1587         case 24: case 26:
1588                 vc->vc_state = ESnormal;
1589                 return;
1590         case 27:
1591                 vc->vc_state = ESesc;
1592                 return;
1593         case 127:
1594                 del(vc);
1595                 return;
1596         case 128+27:
1597                 vc->vc_state = ESsquare;
1598                 return;
1599         }
1600         switch(vc->vc_state) {
1601         case ESesc:
1602                 vc->vc_state = ESnormal;
1603                 switch (c) {
1604                 case '[':
1605                         vc->vc_state = ESsquare;
1606                         return;
1607                 case ']':
1608                         vc->vc_state = ESnonstd;
1609                         return;
1610                 case '%':
1611                         vc->vc_state = ESpercent;
1612                         return;
1613                 case 'E':
1614                         cr(vc);
1615                         lf(vc);
1616                         return;
1617                 case 'M':
1618                         ri(vc);
1619                         return;
1620                 case 'D':
1621                         lf(vc);
1622                         return;
1623                 case 'H':
1624                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1625                         return;
1626                 case 'Z':
1627                         respond_ID(tty);
1628                         return;
1629                 case '7':
1630                         save_cur(vc);
1631                         return;
1632                 case '8':
1633                         restore_cur(vc);
1634                         return;
1635                 case '(':
1636                         vc->vc_state = ESsetG0;
1637                         return;
1638                 case ')':
1639                         vc->vc_state = ESsetG1;
1640                         return;
1641                 case '#':
1642                         vc->vc_state = EShash;
1643                         return;
1644                 case 'c':
1645                         reset_terminal(vc, 1);
1646                         return;
1647                 case '>':  /* Numeric keypad */
1648                         clr_kbd(vc, kbdapplic);
1649                         return;
1650                 case '=':  /* Appl. keypad */
1651                         set_kbd(vc, kbdapplic);
1652                         return;
1653                 }
1654                 return;
1655         case ESnonstd:
1656                 if (c=='P') {   /* palette escape sequence */
1657                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1658                                 vc->vc_par[vc->vc_npar] = 0;
1659                         vc->vc_npar = 0;
1660                         vc->vc_state = ESpalette;
1661                         return;
1662                 } else if (c=='R') {   /* reset palette */
1663                         reset_palette(vc);
1664                         vc->vc_state = ESnormal;
1665                 } else
1666                         vc->vc_state = ESnormal;
1667                 return;
1668         case ESpalette:
1669                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1670                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1671                         if (vc->vc_npar == 7) {
1672                                 int i = vc->vc_par[0] * 3, j = 1;
1673                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1674                                 vc->vc_palette[i++] += vc->vc_par[j++];
1675                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1676                                 vc->vc_palette[i++] += vc->vc_par[j++];
1677                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1678                                 vc->vc_palette[i] += vc->vc_par[j];
1679                                 set_palette(vc);
1680                                 vc->vc_state = ESnormal;
1681                         }
1682                 } else
1683                         vc->vc_state = ESnormal;
1684                 return;
1685         case ESsquare:
1686                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1687                         vc->vc_par[vc->vc_npar] = 0;
1688                 vc->vc_npar = 0;
1689                 vc->vc_state = ESgetpars;
1690                 if (c == '[') { /* Function key */
1691                         vc->vc_state=ESfunckey;
1692                         return;
1693                 }
1694                 vc->vc_ques = (c == '?');
1695                 if (vc->vc_ques)
1696                         return;
1697         case ESgetpars:
1698                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1699                         vc->vc_npar++;
1700                         return;
1701                 } else if (c>='0' && c<='9') {
1702                         vc->vc_par[vc->vc_npar] *= 10;
1703                         vc->vc_par[vc->vc_npar] += c - '0';
1704                         return;
1705                 } else
1706                         vc->vc_state = ESgotpars;
1707         case ESgotpars:
1708                 vc->vc_state = ESnormal;
1709                 switch(c) {
1710                 case 'h':
1711                         set_mode(vc, 1);
1712                         return;
1713                 case 'l':
1714                         set_mode(vc, 0);
1715                         return;
1716                 case 'c':
1717                         if (vc->vc_ques) {
1718                                 if (vc->vc_par[0])
1719                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1720                                 else
1721                                         vc->vc_cursor_type = CUR_DEFAULT;
1722                                 return;
1723                         }
1724                         break;
1725                 case 'm':
1726                         if (vc->vc_ques) {
1727                                 clear_selection();
1728                                 if (vc->vc_par[0])
1729                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1730                                 else
1731                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1732                                 return;
1733                         }
1734                         break;
1735                 case 'n':
1736                         if (!vc->vc_ques) {
1737                                 if (vc->vc_par[0] == 5)
1738                                         status_report(tty);
1739                                 else if (vc->vc_par[0] == 6)
1740                                         cursor_report(vc, tty);
1741                         }
1742                         return;
1743                 }
1744                 if (vc->vc_ques) {
1745                         vc->vc_ques = 0;
1746                         return;
1747                 }
1748                 switch(c) {
1749                 case 'G': case '`':
1750                         if (vc->vc_par[0])
1751                                 vc->vc_par[0]--;
1752                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1753                         return;
1754                 case 'A':
1755                         if (!vc->vc_par[0])
1756                                 vc->vc_par[0]++;
1757                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1758                         return;
1759                 case 'B': case 'e':
1760                         if (!vc->vc_par[0])
1761                                 vc->vc_par[0]++;
1762                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1763                         return;
1764                 case 'C': case 'a':
1765                         if (!vc->vc_par[0])
1766                                 vc->vc_par[0]++;
1767                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1768                         return;
1769                 case 'D':
1770                         if (!vc->vc_par[0])
1771                                 vc->vc_par[0]++;
1772                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1773                         return;
1774                 case 'E':
1775                         if (!vc->vc_par[0])
1776                                 vc->vc_par[0]++;
1777                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1778                         return;
1779                 case 'F':
1780                         if (!vc->vc_par[0])
1781                                 vc->vc_par[0]++;
1782                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1783                         return;
1784                 case 'd':
1785                         if (vc->vc_par[0])
1786                                 vc->vc_par[0]--;
1787                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1788                         return;
1789                 case 'H': case 'f':
1790                         if (vc->vc_par[0])
1791                                 vc->vc_par[0]--;
1792                         if (vc->vc_par[1])
1793                                 vc->vc_par[1]--;
1794                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1795                         return;
1796                 case 'J':
1797                         csi_J(vc, vc->vc_par[0]);
1798                         return;
1799                 case 'K':
1800                         csi_K(vc, vc->vc_par[0]);
1801                         return;
1802                 case 'L':
1803                         csi_L(vc, vc->vc_par[0]);
1804                         return;
1805                 case 'M':
1806                         csi_M(vc, vc->vc_par[0]);
1807                         return;
1808                 case 'P':
1809                         csi_P(vc, vc->vc_par[0]);
1810                         return;
1811                 case 'c':
1812                         if (!vc->vc_par[0])
1813                                 respond_ID(tty);
1814                         return;
1815                 case 'g':
1816                         if (!vc->vc_par[0])
1817                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1818                         else if (vc->vc_par[0] == 3) {
1819                                 vc->vc_tab_stop[0] =
1820                                         vc->vc_tab_stop[1] =
1821                                         vc->vc_tab_stop[2] =
1822                                         vc->vc_tab_stop[3] =
1823                                         vc->vc_tab_stop[4] = 0;
1824                         }
1825                         return;
1826                 case 'm':
1827                         csi_m(vc);
1828                         return;
1829                 case 'q': /* DECLL - but only 3 leds */
1830                         /* map 0,1,2,3 to 0,1,2,4 */
1831                         if (vc->vc_par[0] < 4)
1832                                 setledstate(kbd_table + vc->vc_num,
1833                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1834                         return;
1835                 case 'r':
1836                         if (!vc->vc_par[0])
1837                                 vc->vc_par[0]++;
1838                         if (!vc->vc_par[1])
1839                                 vc->vc_par[1] = vc->vc_rows;
1840                         /* Minimum allowed region is 2 lines */
1841                         if (vc->vc_par[0] < vc->vc_par[1] &&
1842                             vc->vc_par[1] <= vc->vc_rows) {
1843                                 vc->vc_top = vc->vc_par[0] - 1;
1844                                 vc->vc_bottom = vc->vc_par[1];
1845                                 gotoxay(vc, 0, 0);
1846                         }
1847                         return;
1848                 case 's':
1849                         save_cur(vc);
1850                         return;
1851                 case 'u':
1852                         restore_cur(vc);
1853                         return;
1854                 case 'X':
1855                         csi_X(vc, vc->vc_par[0]);
1856                         return;
1857                 case '@':
1858                         csi_at(vc, vc->vc_par[0]);
1859                         return;
1860                 case ']': /* setterm functions */
1861                         setterm_command(vc);
1862                         return;
1863                 }
1864                 return;
1865         case ESpercent:
1866                 vc->vc_state = ESnormal;
1867                 switch (c) {
1868                 case '@':  /* defined in ISO 2022 */
1869                         vc->vc_utf = 0;
1870                         return;
1871                 case 'G':  /* prelim official escape code */
1872                 case '8':  /* retained for compatibility */
1873                         vc->vc_utf = 1;
1874                         return;
1875                 }
1876                 return;
1877         case ESfunckey:
1878                 vc->vc_state = ESnormal;
1879                 return;
1880         case EShash:
1881                 vc->vc_state = ESnormal;
1882                 if (c == '8') {
1883                         /* DEC screen alignment test. kludge :-) */
1884                         vc->vc_video_erase_char =
1885                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1886                         csi_J(vc, 2);
1887                         vc->vc_video_erase_char =
1888                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1889                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1890                 }
1891                 return;
1892         case ESsetG0:
1893                 if (c == '0')
1894                         vc->vc_G0_charset = GRAF_MAP;
1895                 else if (c == 'B')
1896                         vc->vc_G0_charset = LAT1_MAP;
1897                 else if (c == 'U')
1898                         vc->vc_G0_charset = IBMPC_MAP;
1899                 else if (c == 'K')
1900                         vc->vc_G0_charset = USER_MAP;
1901                 if (vc->vc_charset == 0)
1902                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1903                 vc->vc_state = ESnormal;
1904                 return;
1905         case ESsetG1:
1906                 if (c == '0')
1907                         vc->vc_G1_charset = GRAF_MAP;
1908                 else if (c == 'B')
1909                         vc->vc_G1_charset = LAT1_MAP;
1910                 else if (c == 'U')
1911                         vc->vc_G1_charset = IBMPC_MAP;
1912                 else if (c == 'K')
1913                         vc->vc_G1_charset = USER_MAP;
1914                 if (vc->vc_charset == 1)
1915                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1916                 vc->vc_state = ESnormal;
1917                 return;
1918         default:
1919                 vc->vc_state = ESnormal;
1920         }
1921 }
1922
1923 /* This is a temporary buffer used to prepare a tty console write
1924  * so that we can easily avoid touching user space while holding the
1925  * console spinlock.  It is allocated in con_init and is shared by
1926  * this code and the vc_screen read/write tty calls.
1927  *
1928  * We have to allocate this statically in the kernel data section
1929  * since console_init (and thus con_init) are called before any
1930  * kernel memory allocation is available.
1931  */
1932 char con_buf[CON_BUF_SIZE];
1933 DECLARE_MUTEX(con_buf_sem);
1934
1935 /* acquires console_sem */
1936 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1937 {
1938 #ifdef VT_BUF_VRAM_ONLY
1939 #define FLUSH do { } while(0);
1940 #else
1941 #define FLUSH if (draw_x >= 0) { \
1942         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1943         draw_x = -1; \
1944         }
1945 #endif
1946
1947         int c, tc, ok, n = 0, draw_x = -1;
1948         unsigned int currcons;
1949         unsigned long draw_from = 0, draw_to = 0;
1950         struct vc_data *vc;
1951         u16 himask, charmask;
1952         const unsigned char *orig_buf = NULL;
1953         int orig_count;
1954
1955         if (in_interrupt())
1956                 return count;
1957
1958         might_sleep();
1959
1960         acquire_console_sem();
1961         vc = tty->driver_data;
1962         if (vc == NULL) {
1963                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1964                 release_console_sem();
1965                 return 0;
1966         }
1967
1968         currcons = vc->vc_num;
1969         if (!vc_cons_allocated(currcons)) {
1970             /* could this happen? */
1971             static int error = 0;
1972             if (!error) {
1973                 error = 1;
1974                 printk("con_write: tty %d not allocated\n", currcons+1);
1975             }
1976             release_console_sem();
1977             return 0;
1978         }
1979         release_console_sem();
1980
1981         orig_buf = buf;
1982         orig_count = count;
1983
1984         /* At this point 'buf' is guaranteed to be a kernel buffer
1985          * and therefore no access to userspace (and therefore sleeping)
1986          * will be needed.  The con_buf_sem serializes all tty based
1987          * console rendering and vcs write/read operations.  We hold
1988          * the console spinlock during the entire write.
1989          */
1990
1991         acquire_console_sem();
1992
1993         vc = tty->driver_data;
1994         if (vc == NULL) {
1995                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
1996                 release_console_sem();
1997                 goto out;
1998         }
1999
2000         himask = vc->vc_hi_font_mask;
2001         charmask = himask ? 0x1ff : 0xff;
2002
2003         /* undraw cursor first */
2004         if (IS_FG(vc))
2005                 hide_cursor(vc);
2006
2007         while (!tty->stopped && count) {
2008                 int orig = *buf;
2009                 c = orig;
2010                 buf++;
2011                 n++;
2012                 count--;
2013
2014                 /* Do no translation at all in control states */
2015                 if (vc->vc_state != ESnormal) {
2016                         tc = c;
2017                 } else if (vc->vc_utf) {
2018                     /* Combine UTF-8 into Unicode */
2019                     /* Incomplete characters silently ignored */
2020                     if(c > 0x7f) {
2021                         if (vc->vc_utf_count > 0 && (c & 0xc0) == 0x80) {
2022                                 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2023                                 vc->vc_utf_count--;
2024                                 if (vc->vc_utf_count == 0)
2025                                     tc = c = vc->vc_utf_char;
2026                                 else continue;
2027                         } else {
2028                                 if ((c & 0xe0) == 0xc0) {
2029                                     vc->vc_utf_count = 1;
2030                                     vc->vc_utf_char = (c & 0x1f);
2031                                 } else if ((c & 0xf0) == 0xe0) {
2032                                     vc->vc_utf_count = 2;
2033                                     vc->vc_utf_char = (c & 0x0f);
2034                                 } else if ((c & 0xf8) == 0xf0) {
2035                                     vc->vc_utf_count = 3;
2036                                     vc->vc_utf_char = (c & 0x07);
2037                                 } else if ((c & 0xfc) == 0xf8) {
2038                                     vc->vc_utf_count = 4;
2039                                     vc->vc_utf_char = (c & 0x03);
2040                                 } else if ((c & 0xfe) == 0xfc) {
2041                                     vc->vc_utf_count = 5;
2042                                     vc->vc_utf_char = (c & 0x01);
2043                                 } else
2044                                     vc->vc_utf_count = 0;
2045                                 continue;
2046                               }
2047                     } else {
2048                       tc = c;
2049                       vc->vc_utf_count = 0;
2050                     }
2051                 } else {        /* no utf */
2052                   tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2053                 }
2054
2055                 /* If the original code was a control character we
2056                  * only allow a glyph to be displayed if the code is
2057                  * not normally used (such as for cursor movement) or
2058                  * if the disp_ctrl mode has been explicitly enabled.
2059                  * Certain characters (as given by the CTRL_ALWAYS
2060                  * bitmap) are always displayed as control characters,
2061                  * as the console would be pretty useless without
2062                  * them; to display an arbitrary font position use the
2063                  * direct-to-font zone in UTF-8 mode.
2064                  */
2065                 ok = tc && (c >= 32 ||
2066                             (!vc->vc_utf && !(((vc->vc_disp_ctrl ? CTRL_ALWAYS
2067                                                 : CTRL_ACTION) >> c) & 1)))
2068                         && (c != 127 || vc->vc_disp_ctrl)
2069                         && (c != 128+27);
2070
2071                 if (vc->vc_state == ESnormal && ok) {
2072                         /* Now try to find out how to display it */
2073                         tc = conv_uni_to_pc(vc, tc);
2074                         if ( tc == -4 ) {
2075                                 /* If we got -4 (not found) then see if we have
2076                                    defined a replacement character (U+FFFD) */
2077                                 tc = conv_uni_to_pc(vc, 0xfffd);
2078
2079                                 /* One reason for the -4 can be that we just
2080                                    did a clear_unimap();
2081                                    try at least to show something. */
2082                                 if (tc == -4)
2083                                      tc = c;
2084                         } else if ( tc == -3 ) {
2085                                 /* Bad hash table -- hope for the best */
2086                                 tc = c;
2087                         }
2088                         if (tc & ~charmask)
2089                                 continue; /* Conversion failed */
2090
2091                         if (vc->vc_need_wrap || vc->vc_decim)
2092                                 FLUSH
2093                         if (vc->vc_need_wrap) {
2094                                 cr(vc);
2095                                 lf(vc);
2096                         }
2097                         if (vc->vc_decim)
2098                                 insert_char(vc, 1);
2099                         scr_writew(himask ?
2100                                      ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2101                                      (vc->vc_attr << 8) + tc,
2102                                    (u16 *) vc->vc_pos);
2103                         if (DO_UPDATE(vc) && draw_x < 0) {
2104                                 draw_x = vc->vc_x;
2105                                 draw_from = vc->vc_pos;
2106                         }
2107                         if (vc->vc_x == vc->vc_cols - 1) {
2108                                 vc->vc_need_wrap = vc->vc_decawm;
2109                                 draw_to = vc->vc_pos + 2;
2110                         } else {
2111                                 vc->vc_x++;
2112                                 draw_to = (vc->vc_pos += 2);
2113                         }
2114                         continue;
2115                 }
2116                 FLUSH
2117                 do_con_trol(tty, vc, orig);
2118         }
2119         FLUSH
2120         console_conditional_schedule();
2121         release_console_sem();
2122
2123 out:
2124         return n;
2125 #undef FLUSH
2126 }
2127
2128 /*
2129  * This is the console switching callback.
2130  *
2131  * Doing console switching in a process context allows
2132  * us to do the switches asynchronously (needed when we want
2133  * to switch due to a keyboard interrupt).  Synchronization
2134  * with other console code and prevention of re-entrancy is
2135  * ensured with console_sem.
2136  */
2137 static void console_callback(void *ignored)
2138 {
2139         acquire_console_sem();
2140
2141         if (want_console >= 0) {
2142                 if (want_console != fg_console &&
2143                     vc_cons_allocated(want_console)) {
2144                         hide_cursor(vc_cons[fg_console].d);
2145                         change_console(vc_cons[want_console].d);
2146                         /* we only changed when the console had already
2147                            been allocated - a new console is not created
2148                            in an interrupt routine */
2149                 }
2150                 want_console = -1;
2151         }
2152         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2153                 do_poke_blanked_console = 0;
2154                 poke_blanked_console();
2155         }
2156         if (scrollback_delta) {
2157                 struct vc_data *vc = vc_cons[fg_console].d;
2158                 clear_selection();
2159                 if (vc->vc_mode == KD_TEXT)
2160                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2161                 scrollback_delta = 0;
2162         }
2163         if (blank_timer_expired) {
2164                 do_blank_screen(0);
2165                 blank_timer_expired = 0;
2166         }
2167
2168         release_console_sem();
2169 }
2170
2171 void set_console(int nr)
2172 {
2173         want_console = nr;
2174         schedule_console_callback();
2175 }
2176
2177 struct tty_driver *console_driver;
2178
2179 #ifdef CONFIG_VT_CONSOLE
2180
2181 /*
2182  *      Console on virtual terminal
2183  *
2184  * The console must be locked when we get here.
2185  */
2186
2187 static void vt_console_print(struct console *co, const char *b, unsigned count)
2188 {
2189         struct vc_data *vc = vc_cons[fg_console].d;
2190         unsigned char c;
2191         static unsigned long printing;
2192         const ushort *start;
2193         ushort cnt = 0;
2194         ushort myx;
2195
2196         /* console busy or not yet initialized */
2197         if (!printable || test_and_set_bit(0, &printing))
2198                 return;
2199
2200         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2201                 vc = vc_cons[kmsg_redirect - 1].d;
2202
2203         /* read `x' only after setting currcons properly (otherwise
2204            the `x' macro will read the x of the foreground console). */
2205         myx = vc->vc_x;
2206
2207         if (!vc_cons_allocated(fg_console)) {
2208                 /* impossible */
2209                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2210                 goto quit;
2211         }
2212
2213         if (vc->vc_mode != KD_TEXT)
2214                 goto quit;
2215
2216         /* undraw cursor first */
2217         if (IS_FG(vc))
2218                 hide_cursor(vc);
2219
2220         start = (ushort *)vc->vc_pos;
2221
2222         /* Contrived structure to try to emulate original need_wrap behaviour
2223          * Problems caused when we have need_wrap set on '\n' character */
2224         while (count--) {
2225                 c = *b++;
2226                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2227                         if (cnt > 0) {
2228                                 if (CON_IS_VISIBLE(vc))
2229                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2230                                 vc->vc_x += cnt;
2231                                 if (vc->vc_need_wrap)
2232                                         vc->vc_x--;
2233                                 cnt = 0;
2234                         }
2235                         if (c == 8) {           /* backspace */
2236                                 bs(vc);
2237                                 start = (ushort *)vc->vc_pos;
2238                                 myx = vc->vc_x;
2239                                 continue;
2240                         }
2241                         if (c != 13)
2242                                 lf(vc);
2243                         cr(vc);
2244                         start = (ushort *)vc->vc_pos;
2245                         myx = vc->vc_x;
2246                         if (c == 10 || c == 13)
2247                                 continue;
2248                 }
2249                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2250                 cnt++;
2251                 if (myx == vc->vc_cols - 1) {
2252                         vc->vc_need_wrap = 1;
2253                         continue;
2254                 }
2255                 vc->vc_pos += 2;
2256                 myx++;
2257         }
2258         if (cnt > 0) {
2259                 if (CON_IS_VISIBLE(vc))
2260                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2261                 vc->vc_x += cnt;
2262                 if (vc->vc_x == vc->vc_cols) {
2263                         vc->vc_x--;
2264                         vc->vc_need_wrap = 1;
2265                 }
2266         }
2267         set_cursor(vc);
2268
2269 quit:
2270         clear_bit(0, &printing);
2271 }
2272
2273 static struct tty_driver *vt_console_device(struct console *c, int *index)
2274 {
2275         *index = c->index ? c->index-1 : fg_console;
2276         return console_driver;
2277 }
2278
2279 static struct console vt_console_driver = {
2280         .name           = "tty",
2281         .write          = vt_console_print,
2282         .device         = vt_console_device,
2283         .unblank        = unblank_screen,
2284         .flags          = CON_PRINTBUFFER,
2285         .index          = -1,
2286 };
2287 #endif
2288
2289 /*
2290  *      Handling of Linux-specific VC ioctls
2291  */
2292
2293 /*
2294  * Generally a bit racy with respect to console_sem().
2295  *
2296  * There are some functions which don't need it.
2297  *
2298  * There are some functions which can sleep for arbitrary periods
2299  * (paste_selection) but we don't need the lock there anyway.
2300  *
2301  * set_selection has locking, and definitely needs it
2302  */
2303
2304 int tioclinux(struct tty_struct *tty, unsigned long arg)
2305 {
2306         char type, data;
2307         char __user *p = (char __user *)arg;
2308         int lines;
2309         int ret;
2310
2311         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2312                 return -EINVAL;
2313         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2314                 return -EPERM;
2315         if (get_user(type, p))
2316                 return -EFAULT;
2317         ret = 0;
2318         switch (type)
2319         {
2320                 case TIOCL_SETSEL:
2321                         acquire_console_sem();
2322                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2323                         release_console_sem();
2324                         break;
2325                 case TIOCL_PASTESEL:
2326                         ret = paste_selection(tty);
2327                         break;
2328                 case TIOCL_UNBLANKSCREEN:
2329                         acquire_console_sem();
2330                         unblank_screen();
2331                         release_console_sem();
2332                         break;
2333                 case TIOCL_SELLOADLUT:
2334                         ret = sel_loadlut(p);
2335                         break;
2336                 case TIOCL_GETSHIFTSTATE:
2337
2338         /*
2339          * Make it possible to react to Shift+Mousebutton.
2340          * Note that 'shift_state' is an undocumented
2341          * kernel-internal variable; programs not closely
2342          * related to the kernel should not use this.
2343          */
2344                         data = shift_state;
2345                         ret = __put_user(data, p);
2346                         break;
2347                 case TIOCL_GETMOUSEREPORTING:
2348                         data = mouse_reporting();
2349                         ret = __put_user(data, p);
2350                         break;
2351                 case TIOCL_SETVESABLANK:
2352                         set_vesa_blanking(p);
2353                         break;
2354                 case TIOCL_GETKMSGREDIRECT:
2355                         data = kmsg_redirect;
2356                         ret = __put_user(data, p);
2357                         break;
2358                 case TIOCL_SETKMSGREDIRECT:
2359                         if (!capable(CAP_SYS_ADMIN)) {
2360                                 ret = -EPERM;
2361                         } else {
2362                                 if (get_user(data, p+1))
2363                                         ret = -EFAULT;
2364                                 else
2365                                         kmsg_redirect = data;
2366                         }
2367                         break;
2368                 case TIOCL_GETFGCONSOLE:
2369                         ret = fg_console;
2370                         break;
2371                 case TIOCL_SCROLLCONSOLE:
2372                         if (get_user(lines, (s32 __user *)(p+4))) {
2373                                 ret = -EFAULT;
2374                         } else {
2375                                 scrollfront(vc_cons[fg_console].d, lines);
2376                                 ret = 0;
2377                         }
2378                         break;
2379                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2380                         acquire_console_sem();
2381                         ignore_poke = 1;
2382                         do_blank_screen(0);
2383                         release_console_sem();
2384                         break;
2385                 case TIOCL_BLANKEDSCREEN:
2386                         ret = console_blanked;
2387                         break;
2388                 default:
2389                         ret = -EINVAL;
2390                         break;
2391         }
2392         return ret;
2393 }
2394
2395 /*
2396  * /dev/ttyN handling
2397  */
2398
2399 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2400 {
2401         int     retval;
2402
2403         retval = do_con_write(tty, buf, count);
2404         con_flush_chars(tty);
2405
2406         return retval;
2407 }
2408
2409 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2410 {
2411         if (in_interrupt())
2412                 return; /* n_r3964 calls put_char() from interrupt context */
2413         do_con_write(tty, &ch, 1);
2414 }
2415
2416 static int con_write_room(struct tty_struct *tty)
2417 {
2418         if (tty->stopped)
2419                 return 0;
2420         return 4096;            /* No limit, really; we're not buffering */
2421 }
2422
2423 static int con_chars_in_buffer(struct tty_struct *tty)
2424 {
2425         return 0;               /* we're not buffering */
2426 }
2427
2428 /*
2429  * con_throttle and con_unthrottle are only used for
2430  * paste_selection(), which has to stuff in a large number of
2431  * characters...
2432  */
2433 static void con_throttle(struct tty_struct *tty)
2434 {
2435 }
2436
2437 static void con_unthrottle(struct tty_struct *tty)
2438 {
2439         struct vc_data *vc = tty->driver_data;
2440
2441         wake_up_interruptible(&vc->paste_wait);
2442 }
2443
2444 /*
2445  * Turn the Scroll-Lock LED on when the tty is stopped
2446  */
2447 static void con_stop(struct tty_struct *tty)
2448 {
2449         int console_num;
2450         if (!tty)
2451                 return;
2452         console_num = tty->index;
2453         if (!vc_cons_allocated(console_num))
2454                 return;
2455         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2456         set_leds();
2457 }
2458
2459 /*
2460  * Turn the Scroll-Lock LED off when the console is started
2461  */
2462 static void con_start(struct tty_struct *tty)
2463 {
2464         int console_num;
2465         if (!tty)
2466                 return;
2467         console_num = tty->index;
2468         if (!vc_cons_allocated(console_num))
2469                 return;
2470         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2471         set_leds();
2472 }
2473
2474 static void con_flush_chars(struct tty_struct *tty)
2475 {
2476         struct vc_data *vc;
2477
2478         if (in_interrupt())     /* from flush_to_ldisc */
2479                 return;
2480
2481         /* if we race with con_close(), vt may be null */
2482         acquire_console_sem();
2483         vc = tty->driver_data;
2484         if (vc)
2485                 set_cursor(vc);
2486         release_console_sem();
2487 }
2488
2489 /*
2490  * Allocate the console screen memory.
2491  */
2492 static int con_open(struct tty_struct *tty, struct file *filp)
2493 {
2494         unsigned int currcons = tty->index;
2495         int ret = 0;
2496
2497         acquire_console_sem();
2498         if (tty->driver_data == NULL) {
2499                 ret = vc_allocate(currcons);
2500                 if (ret == 0) {
2501                         struct vc_data *vc = vc_cons[currcons].d;
2502                         tty->driver_data = vc;
2503                         vc->vc_tty = tty;
2504
2505                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2506                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2507                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2508                         }
2509                         release_console_sem();
2510                         vcs_make_devfs(tty);
2511                         return ret;
2512                 }
2513         }
2514         release_console_sem();
2515         return ret;
2516 }
2517
2518 /*
2519  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2520  * and taking a ref against the tty while we're in the process of forgetting
2521  * about it and cleaning things up.
2522  *
2523  * This is because vcs_remove_devfs() can sleep and will drop the BKL.
2524  */
2525 static void con_close(struct tty_struct *tty, struct file *filp)
2526 {
2527         mutex_lock(&tty_mutex);
2528         acquire_console_sem();
2529         if (tty && tty->count == 1) {
2530                 struct vc_data *vc = tty->driver_data;
2531
2532                 if (vc)
2533                         vc->vc_tty = NULL;
2534                 tty->driver_data = NULL;
2535                 release_console_sem();
2536                 vcs_remove_devfs(tty);
2537                 mutex_unlock(&tty_mutex);
2538                 /*
2539                  * tty_mutex is released, but we still hold BKL, so there is
2540                  * still exclusion against init_dev()
2541                  */
2542                 return;
2543         }
2544         release_console_sem();
2545         mutex_unlock(&tty_mutex);
2546 }
2547
2548 static void vc_init(struct vc_data *vc, unsigned int rows,
2549                     unsigned int cols, int do_clear)
2550 {
2551         int j, k ;
2552
2553         vc->vc_cols = cols;
2554         vc->vc_rows = rows;
2555         vc->vc_size_row = cols << 1;
2556         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2557
2558         set_origin(vc);
2559         vc->vc_pos = vc->vc_origin;
2560         reset_vc(vc);
2561         for (j=k=0; j<16; j++) {
2562                 vc->vc_palette[k++] = default_red[j] ;
2563                 vc->vc_palette[k++] = default_grn[j] ;
2564                 vc->vc_palette[k++] = default_blu[j] ;
2565         }
2566         vc->vc_def_color       = 0x07;   /* white */
2567         vc->vc_ulcolor          = 0x0f;   /* bold white */
2568         vc->vc_halfcolor       = 0x08;   /* grey */
2569         init_waitqueue_head(&vc->paste_wait);
2570         reset_terminal(vc, do_clear);
2571 }
2572
2573 /*
2574  * This routine initializes console interrupts, and does nothing
2575  * else. If you want the screen to clear, call tty_write with
2576  * the appropriate escape-sequence.
2577  */
2578
2579 static int __init con_init(void)
2580 {
2581         const char *display_desc = NULL;
2582         struct vc_data *vc;
2583         unsigned int currcons = 0, i;
2584
2585         acquire_console_sem();
2586
2587         if (conswitchp)
2588                 display_desc = conswitchp->con_startup();
2589         if (!display_desc) {
2590                 fg_console = 0;
2591                 release_console_sem();
2592                 return 0;
2593         }
2594
2595         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2596                 struct con_driver *con_driver = &registered_con_driver[i];
2597
2598                 if (con_driver->con == NULL) {
2599                         con_driver->con = conswitchp;
2600                         con_driver->desc = display_desc;
2601                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2602                         con_driver->first = 0;
2603                         con_driver->last = MAX_NR_CONSOLES - 1;
2604                         break;
2605                 }
2606         }
2607
2608         for (i = 0; i < MAX_NR_CONSOLES; i++)
2609                 con_driver_map[i] = conswitchp;
2610
2611         init_timer(&console_timer);
2612         console_timer.function = blank_screen_t;
2613         if (blankinterval) {
2614                 blank_state = blank_normal_wait;
2615                 mod_timer(&console_timer, jiffies + blankinterval);
2616         }
2617
2618         /*
2619          * kmalloc is not running yet - we use the bootmem allocator.
2620          */
2621         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2622                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2623                 visual_init(vc, currcons, 1);
2624                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2625                 vc->vc_kmalloced = 0;
2626                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2627                         currcons || !vc->vc_sw->con_save_screen);
2628         }
2629         currcons = fg_console = 0;
2630         master_display_fg = vc = vc_cons[currcons].d;
2631         set_origin(vc);
2632         save_screen(vc);
2633         gotoxy(vc, vc->vc_x, vc->vc_y);
2634         csi_J(vc, 0);
2635         update_screen(vc);
2636         printk("Console: %s %s %dx%d",
2637                 vc->vc_can_do_color ? "colour" : "mono",
2638                 display_desc, vc->vc_cols, vc->vc_rows);
2639         printable = 1;
2640         printk("\n");
2641
2642         release_console_sem();
2643
2644 #ifdef CONFIG_VT_CONSOLE
2645         register_console(&vt_console_driver);
2646 #endif
2647         return 0;
2648 }
2649 console_initcall(con_init);
2650
2651 static struct tty_operations con_ops = {
2652         .open = con_open,
2653         .close = con_close,
2654         .write = con_write,
2655         .write_room = con_write_room,
2656         .put_char = con_put_char,
2657         .flush_chars = con_flush_chars,
2658         .chars_in_buffer = con_chars_in_buffer,
2659         .ioctl = vt_ioctl,
2660         .stop = con_stop,
2661         .start = con_start,
2662         .throttle = con_throttle,
2663         .unthrottle = con_unthrottle,
2664 };
2665
2666 int __init vty_init(void)
2667 {
2668         vcs_init();
2669
2670         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2671         if (!console_driver)
2672                 panic("Couldn't allocate console driver\n");
2673         console_driver->owner = THIS_MODULE;
2674         console_driver->name = "tty";
2675         console_driver->name_base = 1;
2676         console_driver->major = TTY_MAJOR;
2677         console_driver->minor_start = 1;
2678         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2679         console_driver->init_termios = tty_std_termios;
2680         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2681         tty_set_operations(console_driver, &con_ops);
2682         if (tty_register_driver(console_driver))
2683                 panic("Couldn't register console driver\n");
2684
2685         kbd_init();
2686         console_map_init();
2687 #ifdef CONFIG_PROM_CONSOLE
2688         prom_con_init();
2689 #endif
2690 #ifdef CONFIG_MDA_CONSOLE
2691         mda_console_init();
2692 #endif
2693         return 0;
2694 }
2695
2696 #ifndef VT_SINGLE_DRIVER
2697 #include <linux/device.h>
2698
2699 static struct class *vtconsole_class;
2700
2701 static int bind_con_driver(const struct consw *csw, int first, int last,
2702                            int deflt)
2703 {
2704         struct module *owner = csw->owner;
2705         const char *desc = NULL;
2706         struct con_driver *con_driver;
2707         int i, j = -1, k = -1, retval = -ENODEV;
2708
2709         if (!try_module_get(owner))
2710                 return -ENODEV;
2711
2712         acquire_console_sem();
2713
2714         /* check if driver is registered */
2715         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2716                 con_driver = &registered_con_driver[i];
2717
2718                 if (con_driver->con == csw) {
2719                         desc = con_driver->desc;
2720                         retval = 0;
2721                         break;
2722                 }
2723         }
2724
2725         if (retval)
2726                 goto err;
2727
2728         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2729                 csw->con_startup();
2730                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2731         }
2732
2733         if (deflt) {
2734                 if (conswitchp)
2735                         module_put(conswitchp->owner);
2736
2737                 __module_get(owner);
2738                 conswitchp = csw;
2739         }
2740
2741         first = max(first, con_driver->first);
2742         last = min(last, con_driver->last);
2743
2744         for (i = first; i <= last; i++) {
2745                 int old_was_color;
2746                 struct vc_data *vc = vc_cons[i].d;
2747
2748                 if (con_driver_map[i])
2749                         module_put(con_driver_map[i]->owner);
2750                 __module_get(owner);
2751                 con_driver_map[i] = csw;
2752
2753                 if (!vc || !vc->vc_sw)
2754                         continue;
2755
2756                 j = i;
2757
2758                 if (CON_IS_VISIBLE(vc)) {
2759                         k = i;
2760                         save_screen(vc);
2761                 }
2762
2763                 old_was_color = vc->vc_can_do_color;
2764                 vc->vc_sw->con_deinit(vc);
2765                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2766                 visual_init(vc, i, 0);
2767                 set_origin(vc);
2768                 update_attr(vc);
2769
2770                 /* If the console changed between mono <-> color, then
2771                  * the attributes in the screenbuf will be wrong.  The
2772                  * following resets all attributes to something sane.
2773                  */
2774                 if (old_was_color != vc->vc_can_do_color)
2775                         clear_buffer_attributes(vc);
2776         }
2777
2778         printk("Console: switching ");
2779         if (!deflt)
2780                 printk("consoles %d-%d ", first+1, last+1);
2781         if (j >= 0) {
2782                 struct vc_data *vc = vc_cons[j].d;
2783
2784                 printk("to %s %s %dx%d\n",
2785                        vc->vc_can_do_color ? "colour" : "mono",
2786                        desc, vc->vc_cols, vc->vc_rows);
2787
2788                 if (k >= 0) {
2789                         vc = vc_cons[k].d;
2790                         update_screen(vc);
2791                 }
2792         } else
2793                 printk("to %s\n", desc);
2794
2795         retval = 0;
2796 err:
2797         release_console_sem();
2798         module_put(owner);
2799         return retval;
2800 };
2801
2802 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2803 static int con_is_graphics(const struct consw *csw, int first, int last)
2804 {
2805         int i, retval = 0;
2806
2807         for (i = first; i <= last; i++) {
2808                 struct vc_data *vc = vc_cons[i].d;
2809
2810                 if (vc && vc->vc_mode == KD_GRAPHICS) {
2811                         retval = 1;
2812                         break;
2813                 }
2814         }
2815
2816         return retval;
2817 }
2818
2819 static int unbind_con_driver(const struct consw *csw, int first, int last,
2820                              int deflt)
2821 {
2822         struct module *owner = csw->owner;
2823         const struct consw *defcsw = NULL;
2824         struct con_driver *con_driver = NULL, *con_back = NULL;
2825         int i, retval = -ENODEV;
2826
2827         if (!try_module_get(owner))
2828                 return -ENODEV;
2829
2830         acquire_console_sem();
2831
2832         /* check if driver is registered and if it is unbindable */
2833         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2834                 con_driver = &registered_con_driver[i];
2835
2836                 if (con_driver->con == csw &&
2837                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
2838                         retval = 0;
2839                         break;
2840                 }
2841         }
2842
2843         if (retval) {
2844                 release_console_sem();
2845                 goto err;
2846         }
2847
2848         retval = -ENODEV;
2849
2850         /* check if backup driver exists */
2851         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2852                 con_back = &registered_con_driver[i];
2853
2854                 if (con_back->con &&
2855                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
2856                         defcsw = con_back->con;
2857                         retval = 0;
2858                         break;
2859                 }
2860         }
2861
2862         if (retval) {
2863                 release_console_sem();
2864                 goto err;
2865         }
2866
2867         if (!con_is_bound(csw)) {
2868                 release_console_sem();
2869                 goto err;
2870         }
2871
2872         first = max(first, con_driver->first);
2873         last = min(last, con_driver->last);
2874
2875         for (i = first; i <= last; i++) {
2876                 if (con_driver_map[i] == csw) {
2877                         module_put(csw->owner);
2878                         con_driver_map[i] = NULL;
2879                 }
2880         }
2881
2882         if (!con_is_bound(defcsw)) {
2883                 const struct consw *defconsw = conswitchp;
2884
2885                 defcsw->con_startup();
2886                 con_back->flag |= CON_DRIVER_FLAG_INIT;
2887                 /*
2888                  * vgacon may change the default driver to point
2889                  * to dummycon, we restore it here...
2890                  */
2891                 conswitchp = defconsw;
2892         }
2893
2894         if (!con_is_bound(csw))
2895                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
2896
2897         release_console_sem();
2898         /* ignore return value, binding should not fail */
2899         bind_con_driver(defcsw, first, last, deflt);
2900 err:
2901         module_put(owner);
2902         return retval;
2903
2904 }
2905
2906 static int vt_bind(struct con_driver *con)
2907 {
2908         const struct consw *defcsw = NULL, *csw = NULL;
2909         int i, more = 1, first = -1, last = -1, deflt = 0;
2910
2911         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2912             con_is_graphics(con->con, con->first, con->last))
2913                 goto err;
2914
2915         csw = con->con;
2916
2917         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2918                 struct con_driver *con = &registered_con_driver[i];
2919
2920                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
2921                         defcsw = con->con;
2922                         break;
2923                 }
2924         }
2925
2926         if (!defcsw)
2927                 goto err;
2928
2929         while (more) {
2930                 more = 0;
2931
2932                 for (i = con->first; i <= con->last; i++) {
2933                         if (con_driver_map[i] == defcsw) {
2934                                 if (first == -1)
2935                                         first = i;
2936                                 last = i;
2937                                 more = 1;
2938                         } else if (first != -1)
2939                                 break;
2940                 }
2941
2942                 if (first == 0 && last == MAX_NR_CONSOLES -1)
2943                         deflt = 1;
2944
2945                 if (first != -1)
2946                         bind_con_driver(csw, first, last, deflt);
2947
2948                 first = -1;
2949                 last = -1;
2950                 deflt = 0;
2951         }
2952
2953 err:
2954         return 0;
2955 }
2956
2957 static int vt_unbind(struct con_driver *con)
2958 {
2959         const struct consw *csw = NULL;
2960         int i, more = 1, first = -1, last = -1, deflt = 0;
2961
2962         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2963             con_is_graphics(con->con, con->first, con->last))
2964                 goto err;
2965
2966         csw = con->con;
2967
2968         while (more) {
2969                 more = 0;
2970
2971                 for (i = con->first; i <= con->last; i++) {
2972                         if (con_driver_map[i] == csw) {
2973                                 if (first == -1)
2974                                         first = i;
2975                                 last = i;
2976                                 more = 1;
2977                         } else if (first != -1)
2978                                 break;
2979                 }
2980
2981                 if (first == 0 && last == MAX_NR_CONSOLES -1)
2982                         deflt = 1;
2983
2984                 if (first != -1)
2985                         unbind_con_driver(csw, first, last, deflt);
2986
2987                 first = -1;
2988                 last = -1;
2989                 deflt = 0;
2990         }
2991
2992 err:
2993         return 0;
2994 }
2995 #else
2996 static inline int vt_bind(struct con_driver *con)
2997 {
2998         return 0;
2999 }
3000 static inline int vt_unbind(struct con_driver *con)
3001 {
3002         return 0;
3003 }
3004 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3005
3006 static ssize_t store_bind(struct class_device *class_device,
3007                           const char *buf, size_t count)
3008 {
3009         struct con_driver *con = class_get_devdata(class_device);
3010         int bind = simple_strtoul(buf, NULL, 0);
3011
3012         if (bind)
3013                 vt_bind(con);
3014         else
3015                 vt_unbind(con);
3016
3017         return count;
3018 }
3019
3020 static ssize_t show_bind(struct class_device *class_device, char *buf)
3021 {
3022         struct con_driver *con = class_get_devdata(class_device);
3023         int bind = con_is_bound(con->con);
3024
3025         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3026 }
3027
3028 static ssize_t show_name(struct class_device *class_device, char *buf)
3029 {
3030         struct con_driver *con = class_get_devdata(class_device);
3031
3032         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3033                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3034                          con->desc);
3035
3036 }
3037
3038 static struct class_device_attribute class_device_attrs[] = {
3039         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3040         __ATTR(name, S_IRUGO, show_name, NULL),
3041 };
3042
3043 static int vtconsole_init_class_device(struct con_driver *con)
3044 {
3045         int i;
3046
3047         class_set_devdata(con->class_dev, con);
3048         for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
3049                 class_device_create_file(con->class_dev,
3050                                          &class_device_attrs[i]);
3051
3052         return 0;
3053 }
3054
3055 static void vtconsole_deinit_class_device(struct con_driver *con)
3056 {
3057         int i;
3058
3059         for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
3060                 class_device_remove_file(con->class_dev,
3061                                          &class_device_attrs[i]);
3062 }
3063
3064 /**
3065  * con_is_bound - checks if driver is bound to the console
3066  * @csw: console driver
3067  *
3068  * RETURNS: zero if unbound, nonzero if bound
3069  *
3070  * Drivers can call this and if zero, they should release
3071  * all resources allocated on con_startup()
3072  */
3073 int con_is_bound(const struct consw *csw)
3074 {
3075         int i, bound = 0;
3076
3077         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3078                 if (con_driver_map[i] == csw) {
3079                         bound = 1;
3080                         break;
3081                 }
3082         }
3083
3084         return bound;
3085 }
3086 EXPORT_SYMBOL(con_is_bound);
3087
3088 /**
3089  * register_con_driver - register console driver to console layer
3090  * @csw: console driver
3091  * @first: the first console to take over, minimum value is 0
3092  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3093  *
3094  * DESCRIPTION: This function registers a console driver which can later
3095  * bind to a range of consoles specified by @first and @last. It will
3096  * also initialize the console driver by calling con_startup().
3097  */
3098 int register_con_driver(const struct consw *csw, int first, int last)
3099 {
3100         struct module *owner = csw->owner;
3101         struct con_driver *con_driver;
3102         const char *desc;
3103         int i, retval = 0;
3104
3105         if (!try_module_get(owner))
3106                 return -ENODEV;
3107
3108         acquire_console_sem();
3109
3110         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3111                 con_driver = &registered_con_driver[i];
3112
3113                 /* already registered */
3114                 if (con_driver->con == csw)
3115                         retval = -EINVAL;
3116         }
3117
3118         if (retval)
3119                 goto err;
3120
3121         desc = csw->con_startup();
3122
3123         if (!desc)
3124                 goto err;
3125
3126         retval = -EINVAL;
3127
3128         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3129                 con_driver = &registered_con_driver[i];
3130
3131                 if (con_driver->con == NULL) {
3132                         con_driver->con = csw;
3133                         con_driver->desc = desc;
3134                         con_driver->node = i;
3135                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3136                                            CON_DRIVER_FLAG_INIT;
3137                         con_driver->first = first;
3138                         con_driver->last = last;
3139                         retval = 0;
3140                         break;
3141                 }
3142         }
3143
3144         if (retval)
3145                 goto err;
3146
3147         con_driver->class_dev = class_device_create(vtconsole_class, NULL,
3148                                                     MKDEV(0, con_driver->node),
3149                                                     NULL, "vtcon%i",
3150                                                     con_driver->node);
3151
3152         if (IS_ERR(con_driver->class_dev)) {
3153                 printk(KERN_WARNING "Unable to create class_device for %s; "
3154                        "errno = %ld\n", con_driver->desc,
3155                        PTR_ERR(con_driver->class_dev));
3156                 con_driver->class_dev = NULL;
3157         } else {
3158                 vtconsole_init_class_device(con_driver);
3159         }
3160 err:
3161         release_console_sem();
3162         module_put(owner);
3163         return retval;
3164 }
3165 EXPORT_SYMBOL(register_con_driver);
3166
3167 /**
3168  * unregister_con_driver - unregister console driver from console layer
3169  * @csw: console driver
3170  *
3171  * DESCRIPTION: All drivers that registers to the console layer must
3172  * call this function upon exit, or if the console driver is in a state
3173  * where it won't be able to handle console services, such as the
3174  * framebuffer console without loaded framebuffer drivers.
3175  *
3176  * The driver must unbind first prior to unregistration.
3177  */
3178 int unregister_con_driver(const struct consw *csw)
3179 {
3180         int i, retval = -ENODEV;
3181
3182         acquire_console_sem();
3183
3184         /* cannot unregister a bound driver */
3185         if (con_is_bound(csw))
3186                 goto err;
3187
3188         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3189                 struct con_driver *con_driver = &registered_con_driver[i];
3190
3191                 if (con_driver->con == csw &&
3192                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3193                         vtconsole_deinit_class_device(con_driver);
3194                         class_device_destroy(vtconsole_class,
3195                                              MKDEV(0, con_driver->node));
3196                         con_driver->con = NULL;
3197                         con_driver->desc = NULL;
3198                         con_driver->class_dev = NULL;
3199                         con_driver->node = 0;
3200                         con_driver->flag = 0;
3201                         con_driver->first = 0;
3202                         con_driver->last = 0;
3203                         retval = 0;
3204                         break;
3205                 }
3206         }
3207 err:
3208         release_console_sem();
3209         return retval;
3210 }
3211 EXPORT_SYMBOL(unregister_con_driver);
3212
3213 /*
3214  *      If we support more console drivers, this function is used
3215  *      when a driver wants to take over some existing consoles
3216  *      and become default driver for newly opened ones.
3217  *
3218  *      take_over_console is basically a register followed by unbind
3219  */
3220 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3221 {
3222         int err;
3223
3224         err = register_con_driver(csw, first, last);
3225
3226         if (!err)
3227                 bind_con_driver(csw, first, last, deflt);
3228
3229         return err;
3230 }
3231
3232 /*
3233  * give_up_console is a wrapper to unregister_con_driver. It will only
3234  * work if driver is fully unbound.
3235  */
3236 void give_up_console(const struct consw *csw)
3237 {
3238         unregister_con_driver(csw);
3239 }
3240
3241 static int __init vtconsole_class_init(void)
3242 {
3243         int i;
3244
3245         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3246         if (IS_ERR(vtconsole_class)) {
3247                 printk(KERN_WARNING "Unable to create vt console class; "
3248                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3249                 vtconsole_class = NULL;
3250         }
3251
3252         /* Add system drivers to sysfs */
3253         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3254                 struct con_driver *con = &registered_con_driver[i];
3255
3256                 if (con->con && !con->class_dev) {
3257                         con->class_dev =
3258                                 class_device_create(vtconsole_class, NULL,
3259                                                     MKDEV(0, con->node), NULL,
3260                                                     "vtcon%i", con->node);
3261
3262                         if (IS_ERR(con->class_dev)) {
3263                                 printk(KERN_WARNING "Unable to create "
3264                                        "class_device for %s; errno = %ld\n",
3265                                        con->desc, PTR_ERR(con->class_dev));
3266                                 con->class_dev = NULL;
3267                         } else {
3268                                 vtconsole_init_class_device(con);
3269                         }
3270                 }
3271         }
3272
3273         return 0;
3274 }
3275 postcore_initcall(vtconsole_class_init);
3276
3277 #endif
3278
3279 /*
3280  *      Screen blanking
3281  */
3282
3283 static void set_vesa_blanking(char __user *p)
3284 {
3285     unsigned int mode;
3286     get_user(mode, p + 1);
3287     vesa_blank_mode = (mode < 4) ? mode : 0;
3288 }
3289
3290 void do_blank_screen(int entering_gfx)
3291 {
3292         struct vc_data *vc = vc_cons[fg_console].d;
3293         int i;
3294
3295         WARN_CONSOLE_UNLOCKED();
3296
3297         if (console_blanked) {
3298                 if (blank_state == blank_vesa_wait) {
3299                         blank_state = blank_off;
3300                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3301                 }
3302                 return;
3303         }
3304         if (blank_state != blank_normal_wait)
3305                 return;
3306         blank_state = blank_off;
3307
3308         /* entering graphics mode? */
3309         if (entering_gfx) {
3310                 hide_cursor(vc);
3311                 save_screen(vc);
3312                 vc->vc_sw->con_blank(vc, -1, 1);
3313                 console_blanked = fg_console + 1;
3314                 set_origin(vc);
3315                 return;
3316         }
3317
3318         /* don't blank graphics */
3319         if (vc->vc_mode != KD_TEXT) {
3320                 console_blanked = fg_console + 1;
3321                 return;
3322         }
3323
3324         hide_cursor(vc);
3325         del_timer_sync(&console_timer);
3326         blank_timer_expired = 0;
3327
3328         save_screen(vc);
3329         /* In case we need to reset origin, blanking hook returns 1 */
3330         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3331         console_blanked = fg_console + 1;
3332         if (i)
3333                 set_origin(vc);
3334
3335         if (console_blank_hook && console_blank_hook(1))
3336                 return;
3337
3338         if (vesa_off_interval && vesa_blank_mode) {
3339                 blank_state = blank_vesa_wait;
3340                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3341         }
3342 }
3343 EXPORT_SYMBOL(do_blank_screen);
3344
3345 /*
3346  * Called by timer as well as from vt_console_driver
3347  */
3348 void do_unblank_screen(int leaving_gfx)
3349 {
3350         struct vc_data *vc;
3351
3352         /* This should now always be called from a "sane" (read: can schedule)
3353          * context for the sake of the low level drivers, except in the special
3354          * case of oops_in_progress
3355          */
3356         if (!oops_in_progress)
3357                 might_sleep();
3358
3359         WARN_CONSOLE_UNLOCKED();
3360
3361         ignore_poke = 0;
3362         if (!console_blanked)
3363                 return;
3364         if (!vc_cons_allocated(fg_console)) {
3365                 /* impossible */
3366                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3367                 return;
3368         }
3369         vc = vc_cons[fg_console].d;
3370         if (vc->vc_mode != KD_TEXT)
3371                 return; /* but leave console_blanked != 0 */
3372
3373         if (blankinterval) {
3374                 mod_timer(&console_timer, jiffies + blankinterval);
3375                 blank_state = blank_normal_wait;
3376         }
3377
3378         console_blanked = 0;
3379         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3380                 /* Low-level driver cannot restore -> do it ourselves */
3381                 update_screen(vc);
3382         if (console_blank_hook)
3383                 console_blank_hook(0);
3384         set_palette(vc);
3385         set_cursor(vc);
3386 }
3387 EXPORT_SYMBOL(do_unblank_screen);
3388
3389 /*
3390  * This is called by the outside world to cause a forced unblank, mostly for
3391  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3392  * call it with 1 as an argument and so force a mode restore... that may kill
3393  * X or at least garbage the screen but would also make the Oops visible...
3394  */
3395 void unblank_screen(void)
3396 {
3397         do_unblank_screen(0);
3398 }
3399
3400 /*
3401  * We defer the timer blanking to work queue so it can take the console mutex
3402  * (console operations can still happen at irq time, but only from printk which
3403  * has the console mutex. Not perfect yet, but better than no locking
3404  */
3405 static void blank_screen_t(unsigned long dummy)
3406 {
3407         if (unlikely(!keventd_up())) {
3408                 mod_timer(&console_timer, jiffies + blankinterval);
3409                 return;
3410         }
3411         blank_timer_expired = 1;
3412         schedule_work(&console_work);
3413 }
3414
3415 void poke_blanked_console(void)
3416 {
3417         WARN_CONSOLE_UNLOCKED();
3418
3419         /* Add this so we quickly catch whoever might call us in a non
3420          * safe context. Nowadays, unblank_screen() isn't to be called in
3421          * atomic contexts and is allowed to schedule (with the special case
3422          * of oops_in_progress, but that isn't of any concern for this
3423          * function. --BenH.
3424          */
3425         might_sleep();
3426
3427         /* This isn't perfectly race free, but a race here would be mostly harmless,
3428          * at worse, we'll do a spurrious blank and it's unlikely
3429          */
3430         del_timer(&console_timer);
3431         blank_timer_expired = 0;
3432
3433         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3434                 return;
3435         if (console_blanked)
3436                 unblank_screen();
3437         else if (blankinterval) {
3438                 mod_timer(&console_timer, jiffies + blankinterval);
3439                 blank_state = blank_normal_wait;
3440         }
3441 }
3442
3443 /*
3444  *      Palettes
3445  */
3446
3447 static void set_palette(struct vc_data *vc)
3448 {
3449         WARN_CONSOLE_UNLOCKED();
3450
3451         if (vc->vc_mode != KD_GRAPHICS)
3452                 vc->vc_sw->con_set_palette(vc, color_table);
3453 }
3454
3455 static int set_get_cmap(unsigned char __user *arg, int set)
3456 {
3457     int i, j, k;
3458
3459     WARN_CONSOLE_UNLOCKED();
3460
3461     for (i = 0; i < 16; i++)
3462         if (set) {
3463             get_user(default_red[i], arg++);
3464             get_user(default_grn[i], arg++);
3465             get_user(default_blu[i], arg++);
3466         } else {
3467             put_user(default_red[i], arg++);
3468             put_user(default_grn[i], arg++);
3469             put_user(default_blu[i], arg++);
3470         }
3471     if (set) {
3472         for (i = 0; i < MAX_NR_CONSOLES; i++)
3473             if (vc_cons_allocated(i)) {
3474                 for (j = k = 0; j < 16; j++) {
3475                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3476                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3477                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3478                 }
3479                 set_palette(vc_cons[i].d);
3480             }
3481     }
3482     return 0;
3483 }
3484
3485 /*
3486  * Load palette into the DAC registers. arg points to a colour
3487  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3488  */
3489
3490 int con_set_cmap(unsigned char __user *arg)
3491 {
3492         int rc;
3493
3494         acquire_console_sem();
3495         rc = set_get_cmap (arg,1);
3496         release_console_sem();
3497
3498         return rc;
3499 }
3500
3501 int con_get_cmap(unsigned char __user *arg)
3502 {
3503         int rc;
3504
3505         acquire_console_sem();
3506         rc = set_get_cmap (arg,0);
3507         release_console_sem();
3508
3509         return rc;
3510 }
3511
3512 void reset_palette(struct vc_data *vc)
3513 {
3514         int j, k;
3515         for (j=k=0; j<16; j++) {
3516                 vc->vc_palette[k++] = default_red[j];
3517                 vc->vc_palette[k++] = default_grn[j];
3518                 vc->vc_palette[k++] = default_blu[j];
3519         }
3520         set_palette(vc);
3521 }
3522
3523 /*
3524  *  Font switching
3525  *
3526  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3527  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3528  *  depending on width) reserved for each character which is kinda wasty, but
3529  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3530  *  is upto the actual low-level console-driver convert data into its favorite
3531  *  format (maybe we should add a `fontoffset' field to the `display'
3532  *  structure so we won't have to convert the fontdata all the time.
3533  *  /Jes
3534  */
3535
3536 #define max_font_size 65536
3537
3538 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3539 {
3540         struct console_font font;
3541         int rc = -EINVAL;
3542         int c;
3543
3544         if (vc->vc_mode != KD_TEXT)
3545                 return -EINVAL;
3546
3547         if (op->data) {
3548                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3549                 if (!font.data)
3550                         return -ENOMEM;
3551         } else
3552                 font.data = NULL;
3553
3554         acquire_console_sem();
3555         if (vc->vc_sw->con_font_get)
3556                 rc = vc->vc_sw->con_font_get(vc, &font);
3557         else
3558                 rc = -ENOSYS;
3559         release_console_sem();
3560
3561         if (rc)
3562                 goto out;
3563
3564         c = (font.width+7)/8 * 32 * font.charcount;
3565
3566         if (op->data && font.charcount > op->charcount)
3567                 rc = -ENOSPC;
3568         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3569                 if (font.width > op->width || font.height > op->height)
3570                         rc = -ENOSPC;
3571         } else {
3572                 if (font.width != 8)
3573                         rc = -EIO;
3574                 else if ((op->height && font.height > op->height) ||
3575                          font.height > 32)
3576                         rc = -ENOSPC;
3577         }
3578         if (rc)
3579                 goto out;
3580
3581         op->height = font.height;
3582         op->width = font.width;
3583         op->charcount = font.charcount;
3584
3585         if (op->data && copy_to_user(op->data, font.data, c))
3586                 rc = -EFAULT;
3587
3588 out:
3589         kfree(font.data);
3590         return rc;
3591 }
3592
3593 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3594 {
3595         struct console_font font;
3596         int rc = -EINVAL;
3597         int size;
3598
3599         if (vc->vc_mode != KD_TEXT)
3600                 return -EINVAL;
3601         if (!op->data)
3602                 return -EINVAL;
3603         if (op->charcount > 512)
3604                 return -EINVAL;
3605         if (!op->height) {              /* Need to guess font height [compat] */
3606                 int h, i;
3607                 u8 __user *charmap = op->data;
3608                 u8 tmp;
3609
3610                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3611                    so that we can get rid of this soon */
3612                 if (!(op->flags & KD_FONT_FLAG_OLD))
3613                         return -EINVAL;
3614                 for (h = 32; h > 0; h--)
3615                         for (i = 0; i < op->charcount; i++) {
3616                                 if (get_user(tmp, &charmap[32*i+h-1]))
3617                                         return -EFAULT;
3618                                 if (tmp)
3619                                         goto nonzero;
3620                         }
3621                 return -EINVAL;
3622         nonzero:
3623                 op->height = h;
3624         }
3625         if (op->width <= 0 || op->width > 32 || op->height > 32)
3626                 return -EINVAL;
3627         size = (op->width+7)/8 * 32 * op->charcount;
3628         if (size > max_font_size)
3629                 return -ENOSPC;
3630         font.charcount = op->charcount;
3631         font.height = op->height;
3632         font.width = op->width;
3633         font.data = kmalloc(size, GFP_KERNEL);
3634         if (!font.data)
3635                 return -ENOMEM;
3636         if (copy_from_user(font.data, op->data, size)) {
3637                 kfree(font.data);
3638                 return -EFAULT;
3639         }
3640         acquire_console_sem();
3641         if (vc->vc_sw->con_font_set)
3642                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3643         else
3644                 rc = -ENOSYS;
3645         release_console_sem();
3646         kfree(font.data);
3647         return rc;
3648 }
3649
3650 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3651 {
3652         struct console_font font = {.width = op->width, .height = op->height};
3653         char name[MAX_FONT_NAME];
3654         char *s = name;
3655         int rc;
3656
3657         if (vc->vc_mode != KD_TEXT)
3658                 return -EINVAL;
3659
3660         if (!op->data)
3661                 s = NULL;
3662         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3663                 return -EFAULT;
3664         else
3665                 name[MAX_FONT_NAME - 1] = 0;
3666
3667         acquire_console_sem();
3668         if (vc->vc_sw->con_font_default)
3669                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3670         else
3671                 rc = -ENOSYS;
3672         release_console_sem();
3673         if (!rc) {
3674                 op->width = font.width;
3675                 op->height = font.height;
3676         }
3677         return rc;
3678 }
3679
3680 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3681 {
3682         int con = op->height;
3683         int rc;
3684
3685         if (vc->vc_mode != KD_TEXT)
3686                 return -EINVAL;
3687
3688         acquire_console_sem();
3689         if (!vc->vc_sw->con_font_copy)
3690                 rc = -ENOSYS;
3691         else if (con < 0 || !vc_cons_allocated(con))
3692                 rc = -ENOTTY;
3693         else if (con == vc->vc_num)     /* nothing to do */
3694                 rc = 0;
3695         else
3696                 rc = vc->vc_sw->con_font_copy(vc, con);
3697         release_console_sem();
3698         return rc;
3699 }
3700
3701 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3702 {
3703         switch (op->op) {
3704         case KD_FONT_OP_SET:
3705                 return con_font_set(vc, op);
3706         case KD_FONT_OP_GET:
3707                 return con_font_get(vc, op);
3708         case KD_FONT_OP_SET_DEFAULT:
3709                 return con_font_default(vc, op);
3710         case KD_FONT_OP_COPY:
3711                 return con_font_copy(vc, op);
3712         }
3713         return -ENOSYS;
3714 }
3715
3716 /*
3717  *      Interface exported to selection and vcs.
3718  */
3719
3720 /* used by selection */
3721 u16 screen_glyph(struct vc_data *vc, int offset)
3722 {
3723         u16 w = scr_readw(screenpos(vc, offset, 1));
3724         u16 c = w & 0xff;
3725
3726         if (w & vc->vc_hi_font_mask)
3727                 c |= 0x100;
3728         return c;
3729 }
3730
3731 /* used by vcs - note the word offset */
3732 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3733 {
3734         return screenpos(vc, 2 * w_offset, viewed);
3735 }
3736
3737 void getconsxy(struct vc_data *vc, unsigned char *p)
3738 {
3739         p[0] = vc->vc_x;
3740         p[1] = vc->vc_y;
3741 }
3742
3743 void putconsxy(struct vc_data *vc, unsigned char *p)
3744 {
3745         hide_cursor(vc);
3746         gotoxy(vc, p[0], p[1]);
3747         set_cursor(vc);
3748 }
3749
3750 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3751 {
3752         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3753                 return softcursor_original;
3754         return scr_readw(org);
3755 }
3756
3757 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3758 {
3759         scr_writew(val, org);
3760         if ((unsigned long)org == vc->vc_pos) {
3761                 softcursor_original = -1;
3762                 add_softcursor(vc);
3763         }
3764 }
3765
3766 /*
3767  *      Visible symbols for modules
3768  */
3769
3770 EXPORT_SYMBOL(color_table);
3771 EXPORT_SYMBOL(default_red);
3772 EXPORT_SYMBOL(default_grn);
3773 EXPORT_SYMBOL(default_blu);
3774 EXPORT_SYMBOL(update_region);
3775 EXPORT_SYMBOL(redraw_screen);
3776 EXPORT_SYMBOL(vc_resize);
3777 EXPORT_SYMBOL(vc_lock_resize);
3778 EXPORT_SYMBOL(fg_console);
3779 EXPORT_SYMBOL(console_blank_hook);
3780 EXPORT_SYMBOL(console_blanked);
3781 EXPORT_SYMBOL(vc_cons);
3782 #ifndef VT_SINGLE_DRIVER
3783 EXPORT_SYMBOL(take_over_console);
3784 EXPORT_SYMBOL(give_up_console);
3785 #endif