drivers/char/vt.c

   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton <andrewm@uow.edu.au>
  63  *
  64  * Removed console_lock, enabled interrupts across all console operations
  65  * 13 March 2001, Andrew Morton
  66  *
  67  * Fixed UTF-8 mode so alternate charset modes always work according
  68  * to control sequences interpreted in do_con_trol function
  69  * preserving backward VT100 semigraphics compatibility,
  70  * malformed UTF sequences represented as sequences of replacement glyphs,
  71  * original codes or '?' as a last resort if replacement glyph is undefined
  72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  73  */
  74
  75 #include <linux/module.h>
  76 #include <linux/types.h>
  77 #include <linux/sched.h>
  78 #include <linux/tty.h>
  79 #include <linux/tty_flip.h>
  80 #include <linux/kernel.h>
  81 #include <linux/string.h>
  82 #include <linux/errno.h>
  83 #include <linux/kd.h>
  84 #include <linux/slab.h>
  85 #include <linux/major.h>
  86 #include <linux/mm.h>
  87 #include <linux/console.h>
  88 #include <linux/init.h>
  89 #include <linux/vt_kern.h>
  90 #include <linux/selection.h>
  91 #include <linux/tiocl.h>
  92 #include <linux/kbd_kern.h>
  93 #include <linux/consolemap.h>
  94 #include <linux/timer.h>
  95 #include <linux/interrupt.h>
  96 #include <linux/workqueue.h>
  97 #include <linux/bootmem.h>
  98 #include <linux/pm.h>
  99 #include <linux/font.h>
 100 #include <linux/bitops.h>
 101
 102 #include <asm/io.h>
 103 #include <asm/system.h>
 104 #include <asm/uaccess.h>
 105
 106 #define MAX_NR_CON_DRIVER 16
 107
 108 #define CON_DRIVER_FLAG_MODULE 1
 109 #define CON_DRIVER_FLAG_INIT   2
 110 #define CON_DRIVER_FLAG_ATTR   4
 111
 112 struct con_driver {
 113         const struct consw *con;
 114         const char *desc;
 115         struct device *dev;
 116         int node;
 117         int first;
 118         int last;
 119         int flag;
 120 };
 121
 122 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 123 const struct consw *conswitchp;
 124
 125 /* A bitmap for codes <32. A bit of 1 indicates that the code
 126  * corresponding to that bit number invokes some special action
 127  * (such as cursor movement) and should not be displayed as a
 128  * glyph unless the disp_ctrl mode is explicitly enabled.
 129  */
 130 #define CTRL_ACTION 0x0d00ff81
 131 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 132
 133 /*
 134  * Here is the default bell parameters: 750HZ, 1/8th of a second
 135  */
 136 #define DEFAULT_BELL_PITCH      750
 137 #define DEFAULT_BELL_DURATION   (HZ/8)
 138
 139 struct vc vc_cons [MAX_NR_CONSOLES];
 140
 141 #ifndef VT_SINGLE_DRIVER
 142 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 143 #endif
 144
 145 static int con_open(struct tty_struct *, struct file *);
 146 static void vc_init(struct vc_data *vc, unsigned int rows,
 147                     unsigned int cols, int do_clear);
 148 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 149 static void save_cur(struct vc_data *vc);
 150 static void reset_terminal(struct vc_data *vc, int do_clear);
 151 static void con_flush_chars(struct tty_struct *tty);
 152 static int set_vesa_blanking(char __user *p);
 153 static void set_cursor(struct vc_data *vc);
 154 static void hide_cursor(struct vc_data *vc);
 155 static void console_callback(struct work_struct *ignored);
 156 static void blank_screen_t(unsigned long dummy);
 157 static void set_palette(struct vc_data *vc);
 158
 159 static int printable;           /* Is console ready for printing? */
 160
 161 /*
 162  * ignore_poke: don't unblank the screen when things are typed.  This is
 163  * mainly for the privacy of braille terminal users.
 164  */
 165 static int ignore_poke;
 166
 167 int do_poke_blanked_console;
 168 int console_blanked;
 169
 170 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 171 static int blankinterval = 10*60*HZ;
 172 static int vesa_off_interval;
 173
 174 static DECLARE_WORK(console_work, console_callback);
 175
 176 /*
 177  * fg_console is the current virtual console,
 178  * last_console is the last used one,
 179  * want_console is the console we want to switch to,
 180  * kmsg_redirect is the console for kernel messages,
 181  */
 182 int fg_console;
 183 int last_console;
 184 int want_console = -1;
 185 int kmsg_redirect;
 186
 187 /*
 188  * For each existing display, we have a pointer to console currently visible
 189  * on that display, allowing consoles other than fg_console to be refreshed
 190  * appropriately. Unless the low-level driver supplies its own display_fg
 191  * variable, we use this one for the "master display".
 192  */
 193 static struct vc_data *master_display_fg;
 194
 195 /*
 196  * Unfortunately, we need to delay tty echo when we're currently writing to the
 197  * console since the code is (and always was) not re-entrant, so we schedule
 198  * all flip requests to process context with schedule-task() and run it from
 199  * console_callback().
 200  */
 201
 202 /*
 203  * For the same reason, we defer scrollback to the console callback.
 204  */
 205 static int scrollback_delta;
 206
 207 /*
 208  * Hook so that the power management routines can (un)blank
 209  * the console on our behalf.
 210  */
 211 int (*console_blank_hook)(int);
 212
 213 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 214 static int blank_state;
 215 static int blank_timer_expired;
 216 enum {
 217         blank_off = 0,
 218         blank_normal_wait,
 219         blank_vesa_wait,
 220 };
 221
 222 /*
 223  *      Low-Level Functions
 224  */
 225
 226 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 227
 228 #ifdef VT_BUF_VRAM_ONLY
 229 #define DO_UPDATE(vc)   0
 230 #else
 231 #define DO_UPDATE(vc)   CON_IS_VISIBLE(vc)
 232 #endif
 233
 234 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 235 {
 236         unsigned short *p;
 237
 238         if (!viewed)
 239                 p = (unsigned short *)(vc->vc_origin + offset);
 240         else if (!vc->vc_sw->con_screen_pos)
 241                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 242         else
 243                 p = vc->vc_sw->con_screen_pos(vc, offset);
 244         return p;
 245 }
 246
 247 static inline void scrolldelta(int lines)
 248 {
 249         scrollback_delta += lines;
 250         schedule_console_callback();
 251 }
 252
 253 void schedule_console_callback(void)
 254 {
 255         schedule_work(&console_work);
 256 }
 257
 258 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 259 {
 260         unsigned short *d, *s;
 261
 262         if (t+nr >= b)
 263                 nr = b - t - 1;
 264         if (b > vc->vc_rows || t >= b || nr < 1)
 265                 return;
 266         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 267                 return;
 268         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 269         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 270         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 271         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 272                     vc->vc_size_row * nr);
 273 }
 274
 275 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 276 {
 277         unsigned short *s;
 278         unsigned int step;
 279
 280         if (t+nr >= b)
 281                 nr = b - t - 1;
 282         if (b > vc->vc_rows || t >= b || nr < 1)
 283                 return;
 284         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 285                 return;
 286         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 287         step = vc->vc_cols * nr;
 288         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 289         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 290 }
 291
 292 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 293 {
 294 #ifndef VT_BUF_VRAM_ONLY
 295         unsigned int xx, yy, offset;
 296         u16 *p;
 297
 298         p = (u16 *) start;
 299         if (!vc->vc_sw->con_getxy) {
 300                 offset = (start - vc->vc_origin) / 2;
 301                 xx = offset % vc->vc_cols;
 302                 yy = offset / vc->vc_cols;
 303         } else {
 304                 int nxx, nyy;
 305                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 306                 xx = nxx; yy = nyy;
 307         }
 308         for(;;) {
 309                 u16 attrib = scr_readw(p) & 0xff00;
 310                 int startx = xx;
 311                 u16 *q = p;
 312                 while (xx < vc->vc_cols && count) {
 313                         if (attrib != (scr_readw(p) & 0xff00)) {
 314                                 if (p > q)
 315                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 316                                 startx = xx;
 317                                 q = p;
 318                                 attrib = scr_readw(p) & 0xff00;
 319                         }
 320                         p++;
 321                         xx++;
 322                         count--;
 323                 }
 324                 if (p > q)
 325                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 326                 if (!count)
 327                         break;
 328                 xx = 0;
 329                 yy++;
 330                 if (vc->vc_sw->con_getxy) {
 331                         p = (u16 *)start;
 332                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 333                 }
 334         }
 335 #endif
 336 }
 337
 338 void update_region(struct vc_data *vc, unsigned long start, int count)
 339 {
 340         WARN_CONSOLE_UNLOCKED();
 341
 342         if (DO_UPDATE(vc)) {
 343                 hide_cursor(vc);
 344                 do_update_region(vc, start, count);
 345                 set_cursor(vc);
 346         }
 347 }
 348
 349 /* Structure of attributes is hardware-dependent */
 350
 351 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse)
 352 {
 353         if (vc->vc_sw->con_build_attr)
 354                 return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse);
 355
 356 #ifndef VT_BUF_VRAM_ONLY
 357 /*
 358  * ++roman: I completely changed the attribute format for monochrome
 359  * mode (!can_do_color). The formerly used MDA (monochrome display
 360  * adapter) format didn't allow the combination of certain effects.
 361  * Now the attribute is just a bit vector:
 362  *  Bit 0..1: intensity (0..2)
 363  *  Bit 2   : underline
 364  *  Bit 3   : reverse
 365  *  Bit 7   : blink
 366  */
 367         {
 368         u8 a = vc->vc_color;
 369         if (!vc->vc_can_do_color)
 370                 return _intensity |
 371                        (_underline ? 4 : 0) |
 372                        (_reverse ? 8 : 0) |
 373                        (_blink ? 0x80 : 0);
 374         if (_underline)
 375                 a = (a & 0xf0) | vc->vc_ulcolor;
 376         else if (_intensity == 0)
 377                 a = (a & 0xf0) | vc->vc_ulcolor;
 378         if (_reverse)
 379                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 380         if (_blink)
 381                 a ^= 0x80;
 382         if (_intensity == 2)
 383                 a ^= 0x08;
 384         if (vc->vc_hi_font_mask == 0x100)
 385                 a <<= 1;
 386         return a;
 387         }
 388 #else
 389         return 0;
 390 #endif
 391 }
 392
 393 static void update_attr(struct vc_data *vc)
 394 {
 395         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm);
 396         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm) << 8) | ' ';
 397 }
 398
 399 /* Note: inverting the screen twice should revert to the original state */
 400 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 401 {
 402         unsigned short *p;
 403
 404         WARN_CONSOLE_UNLOCKED();
 405
 406         count /= 2;
 407         p = screenpos(vc, offset, viewed);
 408         if (vc->vc_sw->con_invert_region)
 409                 vc->vc_sw->con_invert_region(vc, p, count);
 410 #ifndef VT_BUF_VRAM_ONLY
 411         else {
 412                 u16 *q = p;
 413                 int cnt = count;
 414                 u16 a;
 415
 416                 if (!vc->vc_can_do_color) {
 417                         while (cnt--) {
 418                             a = scr_readw(q);
 419                             a ^= 0x0800;
 420                             scr_writew(a, q);
 421                             q++;
 422                         }
 423                 } else if (vc->vc_hi_font_mask == 0x100) {
 424                         while (cnt--) {
 425                                 a = scr_readw(q);
 426                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 427                                 scr_writew(a, q);
 428                                 q++;
 429                         }
 430                 } else {
 431                         while (cnt--) {
 432                                 a = scr_readw(q);
 433                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 434                                 scr_writew(a, q);
 435                                 q++;
 436                         }
 437                 }
 438         }
 439 #endif
 440         if (DO_UPDATE(vc))
 441                 do_update_region(vc, (unsigned long) p, count);
 442 }
 443
 444 /* used by selection: complement pointer position */
 445 void complement_pos(struct vc_data *vc, int offset)
 446 {
 447         static int old_offset = -1;
 448         static unsigned short old;
 449         static unsigned short oldx, oldy;
 450
 451         WARN_CONSOLE_UNLOCKED();
 452
 453         if (old_offset != -1 && old_offset >= 0 &&
 454             old_offset < vc->vc_screenbuf_size) {
 455                 scr_writew(old, screenpos(vc, old_offset, 1));
 456                 if (DO_UPDATE(vc))
 457                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 458         }
 459
 460         old_offset = offset;
 461
 462         if (offset != -1 && offset >= 0 &&
 463             offset < vc->vc_screenbuf_size) {
 464                 unsigned short new;
 465                 unsigned short *p;
 466                 p = screenpos(vc, offset, 1);
 467                 old = scr_readw(p);
 468                 new = old ^ vc->vc_complement_mask;
 469                 scr_writew(new, p);
 470                 if (DO_UPDATE(vc)) {
 471                         oldx = (offset >> 1) % vc->vc_cols;
 472                         oldy = (offset >> 1) / vc->vc_cols;
 473                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 474                 }
 475         }
 476
 477 }
 478
 479 static void insert_char(struct vc_data *vc, unsigned int nr)
 480 {
 481         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 482
 483         p = q + vc->vc_cols - nr - vc->vc_x;
 484         while (--p >= q)
 485                 scr_writew(scr_readw(p), p + nr);
 486         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 487         vc->vc_need_wrap = 0;
 488         if (DO_UPDATE(vc)) {
 489                 unsigned short oldattr = vc->vc_attr;
 490                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 491                                      vc->vc_cols - vc->vc_x - nr);
 492                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 493                 while (nr--)
 494                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 495                 vc->vc_attr = oldattr;
 496         }
 497 }
 498
 499 static void delete_char(struct vc_data *vc, unsigned int nr)
 500 {
 501         unsigned int i = vc->vc_x;
 502         unsigned short *p = (unsigned short *)vc->vc_pos;
 503
 504         while (++i <= vc->vc_cols - nr) {
 505                 scr_writew(scr_readw(p+nr), p);
 506                 p++;
 507         }
 508         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 509         vc->vc_need_wrap = 0;
 510         if (DO_UPDATE(vc)) {
 511                 unsigned short oldattr = vc->vc_attr;
 512                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 513                                      vc->vc_cols - vc->vc_x - nr);
 514                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 515                 while (nr--)
 516                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 517                                      vc->vc_cols - 1 - nr);
 518                 vc->vc_attr = oldattr;
 519         }
 520 }
 521
 522 static int softcursor_original;
 523
 524 static void add_softcursor(struct vc_data *vc)
 525 {
 526         int i = scr_readw((u16 *) vc->vc_pos);
 527         u32 type = vc->vc_cursor_type;
 528
 529         if (! (type & 0x10)) return;
 530         if (softcursor_original != -1) return;
 531         softcursor_original = i;
 532         i |= ((type >> 8) & 0xff00 );
 533         i ^= ((type) & 0xff00 );
 534         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 535         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 536         scr_writew(i, (u16 *) vc->vc_pos);
 537         if (DO_UPDATE(vc))
 538                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 539 }
 540
 541 static void hide_softcursor(struct vc_data *vc)
 542 {
 543         if (softcursor_original != -1) {
 544                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 545                 if (DO_UPDATE(vc))
 546                         vc->vc_sw->con_putc(vc, softcursor_original,
 547                                         vc->vc_y, vc->vc_x);
 548                 softcursor_original = -1;
 549         }
 550 }
 551
 552 static void hide_cursor(struct vc_data *vc)
 553 {
 554         if (vc == sel_cons)
 555                 clear_selection();
 556         vc->vc_sw->con_cursor(vc, CM_ERASE);
 557         hide_softcursor(vc);
 558 }
 559
 560 static void set_cursor(struct vc_data *vc)
 561 {
 562         if (!IS_FG(vc) || console_blanked ||
 563             vc->vc_mode == KD_GRAPHICS)
 564                 return;
 565         if (vc->vc_deccm) {
 566                 if (vc == sel_cons)
 567                         clear_selection();
 568                 add_softcursor(vc);
 569                 if ((vc->vc_cursor_type & 0x0f) != 1)
 570                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 571         } else
 572                 hide_cursor(vc);
 573 }
 574
 575 static void set_origin(struct vc_data *vc)
 576 {
 577         WARN_CONSOLE_UNLOCKED();
 578
 579         if (!CON_IS_VISIBLE(vc) ||
 580             !vc->vc_sw->con_set_origin ||
 581             !vc->vc_sw->con_set_origin(vc))
 582                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 583         vc->vc_visible_origin = vc->vc_origin;
 584         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 585         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 586 }
 587
 588 static inline void save_screen(struct vc_data *vc)
 589 {
 590         WARN_CONSOLE_UNLOCKED();
 591
 592         if (vc->vc_sw->con_save_screen)
 593                 vc->vc_sw->con_save_screen(vc);
 594 }
 595
 596 /*
 597  *      Redrawing of screen
 598  */
 599
 600 static void clear_buffer_attributes(struct vc_data *vc)
 601 {
 602         unsigned short *p = (unsigned short *)vc->vc_origin;
 603         int count = vc->vc_screenbuf_size / 2;
 604         int mask = vc->vc_hi_font_mask | 0xff;
 605
 606         for (; count > 0; count--, p++) {
 607                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 608         }
 609 }
 610
 611 void redraw_screen(struct vc_data *vc, int is_switch)
 612 {
 613         int redraw = 0;
 614
 615         WARN_CONSOLE_UNLOCKED();
 616
 617         if (!vc) {
 618                 /* strange ... */
 619                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 620                 return;
 621         }
 622
 623         if (is_switch) {
 624                 struct vc_data *old_vc = vc_cons[fg_console].d;
 625                 if (old_vc == vc)
 626                         return;
 627                 if (!CON_IS_VISIBLE(vc))
 628                         redraw = 1;
 629                 *vc->vc_display_fg = vc;
 630                 fg_console = vc->vc_num;
 631                 hide_cursor(old_vc);
 632                 if (!CON_IS_VISIBLE(old_vc)) {
 633                         save_screen(old_vc);
 634                         set_origin(old_vc);
 635                 }
 636         } else {
 637                 hide_cursor(vc);
 638                 redraw = 1;
 639         }
 640
 641         if (redraw) {
 642                 int update;
 643                 int old_was_color = vc->vc_can_do_color;
 644
 645                 set_origin(vc);
 646                 update = vc->vc_sw->con_switch(vc);
 647                 set_palette(vc);
 648                 /*
 649                  * If console changed from mono<->color, the best we can do
 650                  * is to clear the buffer attributes. As it currently stands,
 651                  * rebuilding new attributes from the old buffer is not doable
 652                  * without overly complex code.
 653                  */
 654                 if (old_was_color != vc->vc_can_do_color) {
 655                         update_attr(vc);
 656                         clear_buffer_attributes(vc);
 657                 }
 658                 if (update && vc->vc_mode != KD_GRAPHICS)
 659                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 660         }
 661         set_cursor(vc);
 662         if (is_switch) {
 663                 set_leds();
 664                 compute_shiftstate();
 665         }
 666 }
 667
 668 /*
 669  *      Allocation, freeing and resizing of VTs.
 670  */
 671
 672 int vc_cons_allocated(unsigned int i)
 673 {
 674         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 675 }
 676
 677 static void visual_init(struct vc_data *vc, int num, int init)
 678 {
 679         /* ++Geert: vc->vc_sw->con_init determines console size */
 680         if (vc->vc_sw)
 681                 module_put(vc->vc_sw->owner);
 682         vc->vc_sw = conswitchp;
 683 #ifndef VT_SINGLE_DRIVER
 684         if (con_driver_map[num])
 685                 vc->vc_sw = con_driver_map[num];
 686 #endif
 687         __module_get(vc->vc_sw->owner);
 688         vc->vc_num = num;
 689         vc->vc_display_fg = &master_display_fg;
 690         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 691         vc->vc_uni_pagedir = 0;
 692         vc->vc_hi_font_mask = 0;
 693         vc->vc_complement_mask = 0;
 694         vc->vc_can_do_color = 0;
 695         vc->vc_sw->con_init(vc, init);
 696         if (!vc->vc_complement_mask)
 697                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 698         vc->vc_s_complement_mask = vc->vc_complement_mask;
 699         vc->vc_size_row = vc->vc_cols << 1;
 700         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 701 }
 702
 703 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 704 {
 705         WARN_CONSOLE_UNLOCKED();
 706
 707         if (currcons >= MAX_NR_CONSOLES)
 708                 return -ENXIO;
 709         if (!vc_cons[currcons].d) {
 710             struct vc_data *vc;
 711
 712             /* prevent users from taking too much memory */
 713             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 714               return -EPERM;
 715
 716             /* due to the granularity of kmalloc, we waste some memory here */
 717             /* the alloc is done in two steps, to optimize the common situation
 718                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 719             /* although the numbers above are not valid since long ago, the
 720                point is still up-to-date and the comment still has its value
 721                even if only as a historical artifact.  --mj, July 1998 */
 722             vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
 723             if (!vc)
 724                 return -ENOMEM;
 725             memset(vc, 0, sizeof(*vc));
 726             vc_cons[currcons].d = vc;
 727             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 728             visual_init(vc, currcons, 1);
 729             if (!*vc->vc_uni_pagedir_loc)
 730                 con_set_default_unimap(vc);
 731             if (!vc->vc_kmalloced)
 732                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 733             if (!vc->vc_screenbuf) {
 734                 kfree(vc);
 735                 vc_cons[currcons].d = NULL;
 736                 return -ENOMEM;
 737             }
 738             vc->vc_kmalloced = 1;
 739             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 740         }
 741         return 0;
 742 }
 743
 744 static inline int resize_screen(struct vc_data *vc, int width, int height)
 745 {
 746         /* Resizes the resolution of the display adapater */
 747         int err = 0;
 748
 749         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 750                 err = vc->vc_sw->con_resize(vc, width, height);
 751         return err;
 752 }
 753
 754 /*
 755  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 756  * [this is to be used together with some user program
 757  * like resize that changes the hardware videomode]
 758  */
 759 #define VC_RESIZE_MAXCOL (32767)
 760 #define VC_RESIZE_MAXROW (32767)
 761 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 762 {
 763         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 764         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 765         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 766         unsigned int end;
 767         unsigned short *newscreen;
 768
 769         WARN_CONSOLE_UNLOCKED();
 770
 771         if (!vc)
 772                 return -ENXIO;
 773
 774         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 775                 return -EINVAL;
 776
 777         new_cols = (cols ? cols : vc->vc_cols);
 778         new_rows = (lines ? lines : vc->vc_rows);
 779         new_row_size = new_cols << 1;
 780         new_screen_size = new_row_size * new_rows;
 781
 782         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 783                 return 0;
 784
 785         newscreen = kmalloc(new_screen_size, GFP_USER);
 786         if (!newscreen)
 787                 return -ENOMEM;
 788
 789         old_rows = vc->vc_rows;
 790         old_cols = vc->vc_cols;
 791         old_row_size = vc->vc_size_row;
 792         old_screen_size = vc->vc_screenbuf_size;
 793
 794         err = resize_screen(vc, new_cols, new_rows);
 795         if (err) {
 796                 kfree(newscreen);
 797                 return err;
 798         }
 799
 800         vc->vc_rows = new_rows;
 801         vc->vc_cols = new_cols;
 802         vc->vc_size_row = new_row_size;
 803         vc->vc_screenbuf_size = new_screen_size;
 804
 805         rlth = min(old_row_size, new_row_size);
 806         rrem = new_row_size - rlth;
 807         old_origin = vc->vc_origin;
 808         new_origin = (long) newscreen;
 809         new_scr_end = new_origin + new_screen_size;
 810
 811         if (vc->vc_y > new_rows) {
 812                 if (old_rows - vc->vc_y < new_rows) {
 813                         /*
 814                          * Cursor near the bottom, copy contents from the
 815                          * bottom of buffer
 816                          */
 817                         old_origin += (old_rows - new_rows) * old_row_size;
 818                         end = vc->vc_scr_end;
 819                 } else {
 820                         /*
 821                          * Cursor is in no man's land, copy 1/2 screenful
 822                          * from the top and bottom of cursor position
 823                          */
 824                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 825                         end = old_origin + (old_row_size * new_rows);
 826                 }
 827         } else
 828                 /*
 829                  * Cursor near the top, copy contents from the top of buffer
 830                  */
 831                 end = (old_rows > new_rows) ? old_origin +
 832                         (old_row_size * new_rows) :
 833                         vc->vc_scr_end;
 834
 835         update_attr(vc);
 836
 837         while (old_origin < end) {
 838                 scr_memcpyw((unsigned short *) new_origin,
 839                             (unsigned short *) old_origin, rlth);
 840                 if (rrem)
 841                         scr_memsetw((void *)(new_origin + rlth),
 842                                     vc->vc_video_erase_char, rrem);
 843                 old_origin += old_row_size;
 844                 new_origin += new_row_size;
 845         }
 846         if (new_scr_end > new_origin)
 847                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 848                             new_scr_end - new_origin);
 849         if (vc->vc_kmalloced)
 850                 kfree(vc->vc_screenbuf);
 851         vc->vc_screenbuf = newscreen;
 852         vc->vc_kmalloced = 1;
 853         vc->vc_screenbuf_size = new_screen_size;
 854         set_origin(vc);
 855
 856         /* do part of a reset_terminal() */
 857         vc->vc_top = 0;
 858         vc->vc_bottom = vc->vc_rows;
 859         gotoxy(vc, vc->vc_x, vc->vc_y);
 860         save_cur(vc);
 861
 862         if (vc->vc_tty) {
 863                 struct winsize ws, *cws = &vc->vc_tty->winsize;
 864
 865                 memset(&ws, 0, sizeof(ws));
 866                 ws.ws_row = vc->vc_rows;
 867                 ws.ws_col = vc->vc_cols;
 868                 ws.ws_ypixel = vc->vc_scan_lines;
 869                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
 870                     vc->vc_tty->pgrp)
 871                         kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
 872                 *cws = ws;
 873         }
 874
 875         if (CON_IS_VISIBLE(vc))
 876                 update_screen(vc);
 877         return err;
 878 }
 879
 880 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 881 {
 882         int rc;
 883
 884         acquire_console_sem();
 885         rc = vc_resize(vc, cols, lines);
 886         release_console_sem();
 887         return rc;
 888 }
 889
 890 void vc_deallocate(unsigned int currcons)
 891 {
 892         WARN_CONSOLE_UNLOCKED();
 893
 894         if (vc_cons_allocated(currcons)) {
 895                 struct vc_data *vc = vc_cons[currcons].d;
 896                 vc->vc_sw->con_deinit(vc);
 897                 put_pid(vc->vt_pid);
 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 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
 938 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
 939 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
 940
 941 /*
 942  * gotoxy() must verify all boundaries, because the arguments
 943  * might also be negative. If the given position is out of
 944  * bounds, the cursor is placed at the nearest margin.
 945  */
 946 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
 947 {
 948         int min_y, max_y;
 949
 950         if (new_x < 0)
 951                 vc->vc_x = 0;
 952         else {
 953                 if (new_x >= vc->vc_cols)
 954                         vc->vc_x = vc->vc_cols - 1;
 955                 else
 956                         vc->vc_x = new_x;
 957         }
 958
 959         if (vc->vc_decom) {
 960                 min_y = vc->vc_top;
 961                 max_y = vc->vc_bottom;
 962         } else {
 963                 min_y = 0;
 964                 max_y = vc->vc_rows;
 965         }
 966         if (new_y < min_y)
 967                 vc->vc_y = min_y;
 968         else if (new_y >= max_y)
 969                 vc->vc_y = max_y - 1;
 970         else
 971                 vc->vc_y = new_y;
 972         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
 973         vc->vc_need_wrap = 0;
 974 }
 975
 976 /* for absolute user moves, when decom is set */
 977 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
 978 {
 979         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
 980 }
 981
 982 void scrollback(struct vc_data *vc, int lines)
 983 {
 984         if (!lines)
 985                 lines = vc->vc_rows / 2;
 986         scrolldelta(-lines);
 987 }
 988
 989 void scrollfront(struct vc_data *vc, int lines)
 990 {
 991         if (!lines)
 992                 lines = vc->vc_rows / 2;
 993         scrolldelta(lines);
 994 }
 995
 996 static void lf(struct vc_data *vc)
 997 {
 998         /* don't scroll if above bottom of scrolling region, or
 999          * if below scrolling region
1000          */
1001         if (vc->vc_y + 1 == vc->vc_bottom)
1002                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1003         else if (vc->vc_y < vc->vc_rows - 1) {
1004                 vc->vc_y++;
1005                 vc->vc_pos += vc->vc_size_row;
1006         }
1007         vc->vc_need_wrap = 0;
1008 }
1009
1010 static void ri(struct vc_data *vc)
1011 {
1012         /* don't scroll if below top of scrolling region, or
1013          * if above scrolling region
1014          */
1015         if (vc->vc_y == vc->vc_top)
1016                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1017         else if (vc->vc_y > 0) {
1018                 vc->vc_y--;
1019                 vc->vc_pos -= vc->vc_size_row;
1020         }
1021         vc->vc_need_wrap = 0;
1022 }
1023
1024 static inline void cr(struct vc_data *vc)
1025 {
1026         vc->vc_pos -= vc->vc_x << 1;
1027         vc->vc_need_wrap = vc->vc_x = 0;
1028 }
1029
1030 static inline void bs(struct vc_data *vc)
1031 {
1032         if (vc->vc_x) {
1033                 vc->vc_pos -= 2;
1034                 vc->vc_x--;
1035                 vc->vc_need_wrap = 0;
1036         }
1037 }
1038
1039 static inline void del(struct vc_data *vc)
1040 {
1041         /* ignored */
1042 }
1043
1044 static void csi_J(struct vc_data *vc, int vpar)
1045 {
1046         unsigned int count;
1047         unsigned short * start;
1048
1049         switch (vpar) {
1050                 case 0: /* erase from cursor to end of display */
1051                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1052                         start = (unsigned short *)vc->vc_pos;
1053                         if (DO_UPDATE(vc)) {
1054                                 /* do in two stages */
1055                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1056                                               vc->vc_cols - vc->vc_x);
1057                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1058                                               vc->vc_rows - vc->vc_y - 1,
1059                                               vc->vc_cols);
1060                         }
1061                         break;
1062                 case 1: /* erase from start to cursor */
1063                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1064                         start = (unsigned short *)vc->vc_origin;
1065                         if (DO_UPDATE(vc)) {
1066                                 /* do in two stages */
1067                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1068                                               vc->vc_cols);
1069                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1070                                               vc->vc_x + 1);
1071                         }
1072                         break;
1073                 case 2: /* erase whole display */
1074                         count = vc->vc_cols * vc->vc_rows;
1075                         start = (unsigned short *)vc->vc_origin;
1076                         if (DO_UPDATE(vc))
1077                                 vc->vc_sw->con_clear(vc, 0, 0,
1078                                               vc->vc_rows,
1079                                               vc->vc_cols);
1080                         break;
1081                 default:
1082                         return;
1083         }
1084         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1085         vc->vc_need_wrap = 0;
1086 }
1087
1088 static void csi_K(struct vc_data *vc, int vpar)
1089 {
1090         unsigned int count;
1091         unsigned short * start;
1092
1093         switch (vpar) {
1094                 case 0: /* erase from cursor to end of line */
1095                         count = vc->vc_cols - vc->vc_x;
1096                         start = (unsigned short *)vc->vc_pos;
1097                         if (DO_UPDATE(vc))
1098                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1099                                                      vc->vc_cols - vc->vc_x);
1100                         break;
1101                 case 1: /* erase from start of line to cursor */
1102                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1103                         count = vc->vc_x + 1;
1104                         if (DO_UPDATE(vc))
1105                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1106                                                      vc->vc_x + 1);
1107                         break;
1108                 case 2: /* erase whole line */
1109                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1110                         count = vc->vc_cols;
1111                         if (DO_UPDATE(vc))
1112                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1113                                               vc->vc_cols);
1114                         break;
1115                 default:
1116                         return;
1117         }
1118         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1119         vc->vc_need_wrap = 0;
1120 }
1121
1122 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1123 {                                         /* not vt100? */
1124         int count;
1125
1126         if (!vpar)
1127                 vpar++;
1128         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1129
1130         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1131         if (DO_UPDATE(vc))
1132                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1133         vc->vc_need_wrap = 0;
1134 }
1135
1136 static void default_attr(struct vc_data *vc)
1137 {
1138         vc->vc_intensity = 1;
1139         vc->vc_underline = 0;
1140         vc->vc_reverse = 0;
1141         vc->vc_blink = 0;
1142         vc->vc_color = vc->vc_def_color;
1143 }
1144
1145 /* console_sem is held */
1146 static void csi_m(struct vc_data *vc)
1147 {
1148         int i;
1149
1150         for (i = 0; i <= vc->vc_npar; i++)
1151                 switch (vc->vc_par[i]) {
1152                         case 0: /* all attributes off */
1153                                 default_attr(vc);
1154                                 break;
1155                         case 1:
1156                                 vc->vc_intensity = 2;
1157                                 break;
1158                         case 2:
1159                                 vc->vc_intensity = 0;
1160                                 break;
1161                         case 4:
1162                                 vc->vc_underline = 1;
1163                                 break;
1164                         case 5:
1165                                 vc->vc_blink = 1;
1166                                 break;
1167                         case 7:
1168                                 vc->vc_reverse = 1;
1169                                 break;
1170                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1171                                   * Select primary font, don't display
1172                                   * control chars if defined, don't set
1173                                   * bit 8 on output.
1174                                   */
1175                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1176                                                 ? vc->vc_G0_charset
1177                                                 : vc->vc_G1_charset, vc);
1178                                 vc->vc_disp_ctrl = 0;
1179                                 vc->vc_toggle_meta = 0;
1180                                 break;
1181                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1182                                   * Select first alternate font, lets
1183                                   * chars < 32 be displayed as ROM chars.
1184                                   */
1185                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1186                                 vc->vc_disp_ctrl = 1;
1187                                 vc->vc_toggle_meta = 0;
1188                                 break;
1189                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1190                                   * Select second alternate font, toggle
1191                                   * high bit before displaying as ROM char.
1192                                   */
1193                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1194                                 vc->vc_disp_ctrl = 1;
1195                                 vc->vc_toggle_meta = 1;
1196                                 break;
1197                         case 21:
1198                         case 22:
1199                                 vc->vc_intensity = 1;
1200                                 break;
1201                         case 24:
1202                                 vc->vc_underline = 0;
1203                                 break;
1204                         case 25:
1205                                 vc->vc_blink = 0;
1206                                 break;
1207                         case 27:
1208                                 vc->vc_reverse = 0;
1209                                 break;
1210                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1211                                   * Enables underscore, white foreground
1212                                   * with white underscore (Linux - use
1213                                   * default foreground).
1214                                   */
1215                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1216                                 vc->vc_underline = 1;
1217                                 break;
1218                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1219                                   * Disable underline option.
1220                                   * Reset colour to default? It did this
1221                                   * before...
1222                                   */
1223                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1224                                 vc->vc_underline = 0;
1225                                 break;
1226                         case 49:
1227                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1228                                 break;
1229                         default:
1230                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1231                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1232                                                 | (vc->vc_color & 0xf0);
1233                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1234                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1235                                                 | (vc->vc_color & 0x0f);
1236                                 break;
1237                 }
1238         update_attr(vc);
1239 }
1240
1241 static void respond_string(const char *p, struct tty_struct *tty)
1242 {
1243         while (*p) {
1244                 tty_insert_flip_char(tty, *p, 0);
1245                 p++;
1246         }
1247         con_schedule_flip(tty);
1248 }
1249
1250 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1251 {
1252         char buf[40];
1253
1254         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1255         respond_string(buf, tty);
1256 }
1257
1258 static inline void status_report(struct tty_struct *tty)
1259 {
1260         respond_string("\033[0n", tty); /* Terminal ok */
1261 }
1262
1263 static inline void respond_ID(struct tty_struct * tty)
1264 {
1265         respond_string(VT102ID, tty);
1266 }
1267
1268 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1269 {
1270         char buf[8];
1271
1272         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1273                 (char)('!' + mry));
1274         respond_string(buf, tty);
1275 }
1276
1277 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1278 int mouse_reporting(void)
1279 {
1280         return vc_cons[fg_console].d->vc_report_mouse;
1281 }
1282
1283 /* console_sem is held */
1284 static void set_mode(struct vc_data *vc, int on_off)
1285 {
1286         int i;
1287
1288         for (i = 0; i <= vc->vc_npar; i++)
1289                 if (vc->vc_ques) {
1290                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1291                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1292                                 if (on_off)
1293                                         set_kbd(vc, decckm);
1294                                 else
1295                                         clr_kbd(vc, decckm);
1296                                 break;
1297                         case 3: /* 80/132 mode switch unimplemented */
1298                                 vc->vc_deccolm = on_off;
1299 #if 0
1300                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1301                                 /* this alone does not suffice; some user mode
1302                                    utility has to change the hardware regs */
1303 #endif
1304                                 break;
1305                         case 5:                 /* Inverted screen on/off */
1306                                 if (vc->vc_decscnm != on_off) {
1307                                         vc->vc_decscnm = on_off;
1308                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1309                                         update_attr(vc);
1310                                 }
1311                                 break;
1312                         case 6:                 /* Origin relative/absolute */
1313                                 vc->vc_decom = on_off;
1314                                 gotoxay(vc, 0, 0);
1315                                 break;
1316                         case 7:                 /* Autowrap on/off */
1317                                 vc->vc_decawm = on_off;
1318                                 break;
1319                         case 8:                 /* Autorepeat on/off */
1320                                 if (on_off)
1321                                         set_kbd(vc, decarm);
1322                                 else
1323                                         clr_kbd(vc, decarm);
1324                                 break;
1325                         case 9:
1326                                 vc->vc_report_mouse = on_off ? 1 : 0;
1327                                 break;
1328                         case 25:                /* Cursor on/off */
1329                                 vc->vc_deccm = on_off;
1330                                 break;
1331                         case 1000:
1332                                 vc->vc_report_mouse = on_off ? 2 : 0;
1333                                 break;
1334                         }
1335                 } else {
1336                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1337                         case 3:                 /* Monitor (display ctrls) */
1338                                 vc->vc_disp_ctrl = on_off;
1339                                 break;
1340                         case 4:                 /* Insert Mode on/off */
1341                                 vc->vc_decim = on_off;
1342                                 break;
1343                         case 20:                /* Lf, Enter == CrLf/Lf */
1344                                 if (on_off)
1345                                         set_kbd(vc, lnm);
1346                                 else
1347                                         clr_kbd(vc, lnm);
1348                                 break;
1349                         }
1350                 }
1351 }
1352
1353 /* console_sem is held */
1354 static void setterm_command(struct vc_data *vc)
1355 {
1356         switch(vc->vc_par[0]) {
1357                 case 1: /* set color for underline mode */
1358                         if (vc->vc_can_do_color &&
1359                                         vc->vc_par[1] < 16) {
1360                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1361                                 if (vc->vc_underline)
1362                                         update_attr(vc);
1363                         }
1364                         break;
1365                 case 2: /* set color for half intensity mode */
1366                         if (vc->vc_can_do_color &&
1367                                         vc->vc_par[1] < 16) {
1368                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1369                                 if (vc->vc_intensity == 0)
1370                                         update_attr(vc);
1371                         }
1372                         break;
1373                 case 8: /* store colors as defaults */
1374                         vc->vc_def_color = vc->vc_attr;
1375                         if (vc->vc_hi_font_mask == 0x100)
1376                                 vc->vc_def_color >>= 1;
1377                         default_attr(vc);
1378                         update_attr(vc);
1379                         break;
1380                 case 9: /* set blanking interval */
1381                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1382                         poke_blanked_console();
1383                         break;
1384                 case 10: /* set bell frequency in Hz */
1385                         if (vc->vc_npar >= 1)
1386                                 vc->vc_bell_pitch = vc->vc_par[1];
1387                         else
1388                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1389                         break;
1390                 case 11: /* set bell duration in msec */
1391                         if (vc->vc_npar >= 1)
1392                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1393                                         vc->vc_par[1] * HZ / 1000 : 0;
1394                         else
1395                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1396                         break;
1397                 case 12: /* bring specified console to the front */
1398                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1399                                 set_console(vc->vc_par[1] - 1);
1400                         break;
1401                 case 13: /* unblank the screen */
1402                         poke_blanked_console();
1403                         break;
1404                 case 14: /* set vesa powerdown interval */
1405                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1406                         break;
1407                 case 15: /* activate the previous console */
1408                         set_console(last_console);
1409                         break;
1410         }
1411 }
1412
1413 /* console_sem is held */
1414 static void csi_at(struct vc_data *vc, unsigned int nr)
1415 {
1416         if (nr > vc->vc_cols - vc->vc_x)
1417                 nr = vc->vc_cols - vc->vc_x;
1418         else if (!nr)
1419                 nr = 1;
1420         insert_char(vc, nr);
1421 }
1422
1423 /* console_sem is held */
1424 static void csi_L(struct vc_data *vc, unsigned int nr)
1425 {
1426         if (nr > vc->vc_rows - vc->vc_y)
1427                 nr = vc->vc_rows - vc->vc_y;
1428         else if (!nr)
1429                 nr = 1;
1430         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1431         vc->vc_need_wrap = 0;
1432 }
1433
1434 /* console_sem is held */
1435 static void csi_P(struct vc_data *vc, unsigned int nr)
1436 {
1437         if (nr > vc->vc_cols - vc->vc_x)
1438                 nr = vc->vc_cols - vc->vc_x;
1439         else if (!nr)
1440                 nr = 1;
1441         delete_char(vc, nr);
1442 }
1443
1444 /* console_sem is held */
1445 static void csi_M(struct vc_data *vc, unsigned int nr)
1446 {
1447         if (nr > vc->vc_rows - vc->vc_y)
1448                 nr = vc->vc_rows - vc->vc_y;
1449         else if (!nr)
1450                 nr=1;
1451         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1452         vc->vc_need_wrap = 0;
1453 }
1454
1455 /* console_sem is held (except via vc_init->reset_terminal */
1456 static void save_cur(struct vc_data *vc)
1457 {
1458         vc->vc_saved_x          = vc->vc_x;
1459         vc->vc_saved_y          = vc->vc_y;
1460         vc->vc_s_intensity      = vc->vc_intensity;
1461         vc->vc_s_underline      = vc->vc_underline;
1462         vc->vc_s_blink          = vc->vc_blink;
1463         vc->vc_s_reverse        = vc->vc_reverse;
1464         vc->vc_s_charset        = vc->vc_charset;
1465         vc->vc_s_color          = vc->vc_color;
1466         vc->vc_saved_G0         = vc->vc_G0_charset;
1467         vc->vc_saved_G1         = vc->vc_G1_charset;
1468 }
1469
1470 /* console_sem is held */
1471 static void restore_cur(struct vc_data *vc)
1472 {
1473         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1474         vc->vc_intensity        = vc->vc_s_intensity;
1475         vc->vc_underline        = vc->vc_s_underline;
1476         vc->vc_blink            = vc->vc_s_blink;
1477         vc->vc_reverse          = vc->vc_s_reverse;
1478         vc->vc_charset          = vc->vc_s_charset;
1479         vc->vc_color            = vc->vc_s_color;
1480         vc->vc_G0_charset       = vc->vc_saved_G0;
1481         vc->vc_G1_charset       = vc->vc_saved_G1;
1482         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1483         update_attr(vc);
1484         vc->vc_need_wrap = 0;
1485 }
1486
1487 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1488         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1489         ESpalette };
1490
1491 /* console_sem is held (except via vc_init()) */
1492 static void reset_terminal(struct vc_data *vc, int do_clear)
1493 {
1494         vc->vc_top              = 0;
1495         vc->vc_bottom           = vc->vc_rows;
1496         vc->vc_state            = ESnormal;
1497         vc->vc_ques             = 0;
1498         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1499         vc->vc_G0_charset       = LAT1_MAP;
1500         vc->vc_G1_charset       = GRAF_MAP;
1501         vc->vc_charset          = 0;
1502         vc->vc_need_wrap        = 0;
1503         vc->vc_report_mouse     = 0;
1504         vc->vc_utf              = 0;
1505         vc->vc_utf_count        = 0;
1506
1507         vc->vc_disp_ctrl        = 0;
1508         vc->vc_toggle_meta      = 0;
1509
1510         vc->vc_decscnm          = 0;
1511         vc->vc_decom            = 0;
1512         vc->vc_decawm           = 1;
1513         vc->vc_deccm            = 1;
1514         vc->vc_decim            = 0;
1515
1516         set_kbd(vc, decarm);
1517         clr_kbd(vc, decckm);
1518         clr_kbd(vc, kbdapplic);
1519         clr_kbd(vc, lnm);
1520         kbd_table[vc->vc_num].lockstate = 0;
1521         kbd_table[vc->vc_num].slockstate = 0;
1522         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1523         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1524         /* do not do set_leds here because this causes an endless tasklet loop
1525            when the keyboard hasn't been initialized yet */
1526
1527         vc->vc_cursor_type = CUR_DEFAULT;
1528         vc->vc_complement_mask = vc->vc_s_complement_mask;
1529
1530         default_attr(vc);
1531         update_attr(vc);
1532
1533         vc->vc_tab_stop[0]      = 0x01010100;
1534         vc->vc_tab_stop[1]      =
1535         vc->vc_tab_stop[2]      =
1536         vc->vc_tab_stop[3]      =
1537         vc->vc_tab_stop[4]      = 0x01010101;
1538
1539         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1540         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1541
1542         gotoxy(vc, 0, 0);
1543         save_cur(vc);
1544         if (do_clear)
1545             csi_J(vc, 2);
1546 }
1547
1548 /* console_sem is held */
1549 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1550 {
1551         /*
1552          *  Control characters can be used in the _middle_
1553          *  of an escape sequence.
1554          */
1555         switch (c) {
1556         case 0:
1557                 return;
1558         case 7:
1559                 if (vc->vc_bell_duration)
1560                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1561                 return;
1562         case 8:
1563                 bs(vc);
1564                 return;
1565         case 9:
1566                 vc->vc_pos -= (vc->vc_x << 1);
1567                 while (vc->vc_x < vc->vc_cols - 1) {
1568                         vc->vc_x++;
1569                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1570                                 break;
1571                 }
1572                 vc->vc_pos += (vc->vc_x << 1);
1573                 return;
1574         case 10: case 11: case 12:
1575                 lf(vc);
1576                 if (!is_kbd(vc, lnm))
1577                         return;
1578         case 13:
1579                 cr(vc);
1580                 return;
1581         case 14:
1582                 vc->vc_charset = 1;
1583                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1584                 vc->vc_disp_ctrl = 1;
1585                 return;
1586         case 15:
1587                 vc->vc_charset = 0;
1588                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1589                 vc->vc_disp_ctrl = 0;
1590                 return;
1591         case 24: case 26:
1592                 vc->vc_state = ESnormal;
1593                 return;
1594         case 27:
1595                 vc->vc_state = ESesc;
1596                 return;
1597         case 127:
1598                 del(vc);
1599                 return;
1600         case 128+27:
1601                 vc->vc_state = ESsquare;
1602                 return;
1603         }
1604         switch(vc->vc_state) {
1605         case ESesc:
1606                 vc->vc_state = ESnormal;
1607                 switch (c) {
1608                 case '[':
1609                         vc->vc_state = ESsquare;
1610                         return;
1611                 case ']':
1612                         vc->vc_state = ESnonstd;
1613                         return;
1614                 case '%':
1615                         vc->vc_state = ESpercent;
1616                         return;
1617                 case 'E':
1618                         cr(vc);
1619                         lf(vc);
1620                         return;
1621                 case 'M':
1622                         ri(vc);
1623                         return;
1624                 case 'D':
1625                         lf(vc);
1626                         return;
1627                 case 'H':
1628                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1629                         return;
1630                 case 'Z':
1631                         respond_ID(tty);
1632                         return;
1633                 case '7':
1634                         save_cur(vc);
1635                         return;
1636                 case '8':
1637                         restore_cur(vc);
1638                         return;
1639                 case '(':
1640                         vc->vc_state = ESsetG0;
1641                         return;
1642                 case ')':
1643                         vc->vc_state = ESsetG1;
1644                         return;
1645                 case '#':
1646                         vc->vc_state = EShash;
1647                         return;
1648                 case 'c':
1649                         reset_terminal(vc, 1);
1650                         return;
1651                 case '>':  /* Numeric keypad */
1652                         clr_kbd(vc, kbdapplic);
1653                         return;
1654                 case '=':  /* Appl. keypad */
1655                         set_kbd(vc, kbdapplic);
1656                         return;
1657                 }
1658                 return;
1659         case ESnonstd:
1660                 if (c=='P') {   /* palette escape sequence */
1661                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1662                                 vc->vc_par[vc->vc_npar] = 0;
1663                         vc->vc_npar = 0;
1664                         vc->vc_state = ESpalette;
1665                         return;
1666                 } else if (c=='R') {   /* reset palette */
1667                         reset_palette(vc);
1668                         vc->vc_state = ESnormal;
1669                 } else
1670                         vc->vc_state = ESnormal;
1671                 return;
1672         case ESpalette:
1673                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1674                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1675                         if (vc->vc_npar == 7) {
1676                                 int i = vc->vc_par[0] * 3, j = 1;
1677                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1678                                 vc->vc_palette[i++] += vc->vc_par[j++];
1679                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1680                                 vc->vc_palette[i++] += vc->vc_par[j++];
1681                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1682                                 vc->vc_palette[i] += vc->vc_par[j];
1683                                 set_palette(vc);
1684                                 vc->vc_state = ESnormal;
1685                         }
1686                 } else
1687                         vc->vc_state = ESnormal;
1688                 return;
1689         case ESsquare:
1690                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1691                         vc->vc_par[vc->vc_npar] = 0;
1692                 vc->vc_npar = 0;
1693                 vc->vc_state = ESgetpars;
1694                 if (c == '[') { /* Function key */
1695                         vc->vc_state=ESfunckey;
1696                         return;
1697                 }
1698                 vc->vc_ques = (c == '?');
1699                 if (vc->vc_ques)
1700                         return;
1701         case ESgetpars:
1702                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1703                         vc->vc_npar++;
1704                         return;
1705                 } else if (c>='0' && c<='9') {
1706                         vc->vc_par[vc->vc_npar] *= 10;
1707                         vc->vc_par[vc->vc_npar] += c - '0';
1708                         return;
1709                 } else
1710                         vc->vc_state = ESgotpars;
1711         case ESgotpars:
1712                 vc->vc_state = ESnormal;
1713                 switch(c) {
1714                 case 'h':
1715                         set_mode(vc, 1);
1716                         return;
1717                 case 'l':
1718                         set_mode(vc, 0);
1719                         return;
1720                 case 'c':
1721                         if (vc->vc_ques) {
1722                                 if (vc->vc_par[0])
1723                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1724                                 else
1725                                         vc->vc_cursor_type = CUR_DEFAULT;
1726                                 return;
1727                         }
1728                         break;
1729                 case 'm':
1730                         if (vc->vc_ques) {
1731                                 clear_selection();
1732                                 if (vc->vc_par[0])
1733                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1734                                 else
1735                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1736                                 return;
1737                         }
1738                         break;
1739                 case 'n':
1740                         if (!vc->vc_ques) {
1741                                 if (vc->vc_par[0] == 5)
1742                                         status_report(tty);
1743                                 else if (vc->vc_par[0] == 6)
1744                                         cursor_report(vc, tty);
1745                         }
1746                         return;
1747                 }
1748                 if (vc->vc_ques) {
1749                         vc->vc_ques = 0;
1750                         return;
1751                 }
1752                 switch(c) {
1753                 case 'G': case '`':
1754                         if (vc->vc_par[0])
1755                                 vc->vc_par[0]--;
1756                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1757                         return;
1758                 case 'A':
1759                         if (!vc->vc_par[0])
1760                                 vc->vc_par[0]++;
1761                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1762                         return;
1763                 case 'B': case 'e':
1764                         if (!vc->vc_par[0])
1765                                 vc->vc_par[0]++;
1766                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1767                         return;
1768                 case 'C': case 'a':
1769                         if (!vc->vc_par[0])
1770                                 vc->vc_par[0]++;
1771                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1772                         return;
1773                 case 'D':
1774                         if (!vc->vc_par[0])
1775                                 vc->vc_par[0]++;
1776                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1777                         return;
1778                 case 'E':
1779                         if (!vc->vc_par[0])
1780                                 vc->vc_par[0]++;
1781                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1782                         return;
1783                 case 'F':
1784                         if (!vc->vc_par[0])
1785                                 vc->vc_par[0]++;
1786                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1787                         return;
1788                 case 'd':
1789                         if (vc->vc_par[0])
1790                                 vc->vc_par[0]--;
1791                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1792                         return;
1793                 case 'H': case 'f':
1794                         if (vc->vc_par[0])
1795                                 vc->vc_par[0]--;
1796                         if (vc->vc_par[1])
1797                                 vc->vc_par[1]--;
1798                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1799                         return;
1800                 case 'J':
1801                         csi_J(vc, vc->vc_par[0]);
1802                         return;
1803                 case 'K':
1804                         csi_K(vc, vc->vc_par[0]);
1805                         return;
1806                 case 'L':
1807                         csi_L(vc, vc->vc_par[0]);
1808                         return;
1809                 case 'M':
1810                         csi_M(vc, vc->vc_par[0]);
1811                         return;
1812                 case 'P':
1813                         csi_P(vc, vc->vc_par[0]);
1814                         return;
1815                 case 'c':
1816                         if (!vc->vc_par[0])
1817                                 respond_ID(tty);
1818                         return;
1819                 case 'g':
1820                         if (!vc->vc_par[0])
1821                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1822                         else if (vc->vc_par[0] == 3) {
1823                                 vc->vc_tab_stop[0] =
1824                                         vc->vc_tab_stop[1] =
1825                                         vc->vc_tab_stop[2] =
1826                                         vc->vc_tab_stop[3] =
1827                                         vc->vc_tab_stop[4] = 0;
1828                         }
1829                         return;
1830                 case 'm':
1831                         csi_m(vc);
1832                         return;
1833                 case 'q': /* DECLL - but only 3 leds */
1834                         /* map 0,1,2,3 to 0,1,2,4 */
1835                         if (vc->vc_par[0] < 4)
1836                                 setledstate(kbd_table + vc->vc_num,
1837                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1838                         return;
1839                 case 'r':
1840                         if (!vc->vc_par[0])
1841                                 vc->vc_par[0]++;
1842                         if (!vc->vc_par[1])
1843                                 vc->vc_par[1] = vc->vc_rows;
1844                         /* Minimum allowed region is 2 lines */
1845                         if (vc->vc_par[0] < vc->vc_par[1] &&
1846                             vc->vc_par[1] <= vc->vc_rows) {
1847                                 vc->vc_top = vc->vc_par[0] - 1;
1848                                 vc->vc_bottom = vc->vc_par[1];
1849                                 gotoxay(vc, 0, 0);
1850                         }
1851                         return;
1852                 case 's':
1853                         save_cur(vc);
1854                         return;
1855                 case 'u':
1856                         restore_cur(vc);
1857                         return;
1858                 case 'X':
1859                         csi_X(vc, vc->vc_par[0]);
1860                         return;
1861                 case '@':
1862                         csi_at(vc, vc->vc_par[0]);
1863                         return;
1864                 case ']': /* setterm functions */
1865                         setterm_command(vc);
1866                         return;
1867                 }
1868                 return;
1869         case ESpercent:
1870                 vc->vc_state = ESnormal;
1871                 switch (c) {
1872                 case '@':  /* defined in ISO 2022 */
1873                         vc->vc_utf = 0;
1874                         return;
1875                 case 'G':  /* prelim official escape code */
1876                 case '8':  /* retained for compatibility */
1877                         vc->vc_utf = 1;
1878                         return;
1879                 }
1880                 return;
1881         case ESfunckey:
1882                 vc->vc_state = ESnormal;
1883                 return;
1884         case EShash:
1885                 vc->vc_state = ESnormal;
1886                 if (c == '8') {
1887                         /* DEC screen alignment test. kludge :-) */
1888                         vc->vc_video_erase_char =
1889                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1890                         csi_J(vc, 2);
1891                         vc->vc_video_erase_char =
1892                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1893                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1894                 }
1895                 return;
1896         case ESsetG0:
1897                 if (c == '0')
1898                         vc->vc_G0_charset = GRAF_MAP;
1899                 else if (c == 'B')
1900                         vc->vc_G0_charset = LAT1_MAP;
1901                 else if (c == 'U')
1902                         vc->vc_G0_charset = IBMPC_MAP;
1903                 else if (c == 'K')
1904                         vc->vc_G0_charset = USER_MAP;
1905                 if (vc->vc_charset == 0)
1906                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1907                 vc->vc_state = ESnormal;
1908                 return;
1909         case ESsetG1:
1910                 if (c == '0')
1911                         vc->vc_G1_charset = GRAF_MAP;
1912                 else if (c == 'B')
1913                         vc->vc_G1_charset = LAT1_MAP;
1914                 else if (c == 'U')
1915                         vc->vc_G1_charset = IBMPC_MAP;
1916                 else if (c == 'K')
1917                         vc->vc_G1_charset = USER_MAP;
1918                 if (vc->vc_charset == 1)
1919                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1920                 vc->vc_state = ESnormal;
1921                 return;
1922         default:
1923                 vc->vc_state = ESnormal;
1924         }
1925 }
1926
1927 /* This is a temporary buffer used to prepare a tty console write
1928  * so that we can easily avoid touching user space while holding the
1929  * console spinlock.  It is allocated in con_init and is shared by
1930  * this code and the vc_screen read/write tty calls.
1931  *
1932  * We have to allocate this statically in the kernel data section
1933  * since console_init (and thus con_init) are called before any
1934  * kernel memory allocation is available.
1935  */
1936 char con_buf[CON_BUF_SIZE];
1937 DECLARE_MUTEX(con_buf_sem);
1938
1939 /* is_double_width() is based on the wcwidth() implementation by
1940  * Markus Kuhn -- 2003-05-20 (Unicode 4.0)
1941  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
1942  */
1943 struct interval {
1944         uint32_t first;
1945         uint32_t last;
1946 };
1947
1948 static int bisearch(uint32_t ucs, const struct interval *table, int max)
1949 {
1950         int min = 0;
1951         int mid;
1952
1953         if (ucs < table[0].first || ucs > table[max].last)
1954                 return 0;
1955         while (max >= min) {
1956                 mid = (min + max) / 2;
1957                 if (ucs > table[mid].last)
1958                         min = mid + 1;
1959                 else if (ucs < table[mid].first)
1960                         max = mid - 1;
1961                 else
1962                         return 1;
1963         }
1964         return 0;
1965 }
1966
1967 static int is_double_width(uint32_t ucs)
1968 {
1969         static const struct interval double_width[] = {
1970                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
1971                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1972                 { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 }, { 0xFFE0, 0xFFE6 },
1973                 { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
1974         };
1975         return bisearch(ucs, double_width,
1976                 sizeof(double_width) / sizeof(*double_width) - 1);
1977 }
1978
1979 /* acquires console_sem */
1980 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1981 {
1982 #ifdef VT_BUF_VRAM_ONLY
1983 #define FLUSH do { } while(0);
1984 #else
1985 #define FLUSH if (draw_x >= 0) { \
1986         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1987         draw_x = -1; \
1988         }
1989 #endif
1990
1991         int c, tc, ok, n = 0, draw_x = -1;
1992         unsigned int currcons;
1993         unsigned long draw_from = 0, draw_to = 0;
1994         struct vc_data *vc;
1995         unsigned char vc_attr;
1996         uint8_t rescan;
1997         uint8_t inverse;
1998         uint8_t width;
1999         u16 himask, charmask;
2000         const unsigned char *orig_buf = NULL;
2001         int orig_count;
2002
2003         if (in_interrupt())
2004                 return count;
2005
2006         might_sleep();
2007
2008         acquire_console_sem();
2009         vc = tty->driver_data;
2010         if (vc == NULL) {
2011                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2012                 release_console_sem();
2013                 return 0;
2014         }
2015
2016         currcons = vc->vc_num;
2017         if (!vc_cons_allocated(currcons)) {
2018             /* could this happen? */
2019             static int error = 0;
2020             if (!error) {
2021                 error = 1;
2022                 printk("con_write: tty %d not allocated\n", currcons+1);
2023             }
2024             release_console_sem();
2025             return 0;
2026         }
2027         release_console_sem();
2028
2029         orig_buf = buf;
2030         orig_count = count;
2031
2032         /* At this point 'buf' is guaranteed to be a kernel buffer
2033          * and therefore no access to userspace (and therefore sleeping)
2034          * will be needed.  The con_buf_sem serializes all tty based
2035          * console rendering and vcs write/read operations.  We hold
2036          * the console spinlock during the entire write.
2037          */
2038
2039         acquire_console_sem();
2040
2041         vc = tty->driver_data;
2042         if (vc == NULL) {
2043                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2044                 release_console_sem();
2045                 goto out;
2046         }
2047
2048         himask = vc->vc_hi_font_mask;
2049         charmask = himask ? 0x1ff : 0xff;
2050
2051         /* undraw cursor first */
2052         if (IS_FG(vc))
2053                 hide_cursor(vc);
2054
2055         while (!tty->stopped && count) {
2056                 int orig = *buf;
2057                 c = orig;
2058                 buf++;
2059                 n++;
2060                 count--;
2061                 rescan = 0;
2062                 inverse = 0;
2063                 width = 1;
2064
2065                 /* Do no translation at all in control states */
2066                 if (vc->vc_state != ESnormal) {
2067                         tc = c;
2068                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2069                     /* Combine UTF-8 into Unicode in vc_utf_char.
2070                      * vc_utf_count is the number of continuation bytes still
2071                      * expected to arrive.
2072                      * vc_npar is the number of continuation bytes arrived so
2073                      * far
2074                      */
2075 rescan_last_byte:
2076                     if ((c & 0xc0) == 0x80) {
2077                         /* Continuation byte received */
2078                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2079                         if (vc->vc_utf_count) {
2080                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2081                             vc->vc_npar++;
2082                             if (--vc->vc_utf_count) {
2083                                 /* Still need some bytes */
2084                                 continue;
2085                             }
2086                             /* Got a whole character */
2087                             c = vc->vc_utf_char;
2088                             /* Reject overlong sequences */
2089                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2090                                         c > utf8_length_changes[vc->vc_npar])
2091                                 c = 0xfffd;
2092                         } else {
2093                             /* Unexpected continuation byte */
2094                             vc->vc_utf_count = 0;
2095                             c = 0xfffd;
2096                         }
2097                     } else {
2098                         /* Single ASCII byte or first byte of a sequence received */
2099                         if (vc->vc_utf_count) {
2100                             /* Continuation byte expected */
2101                             rescan = 1;
2102                             vc->vc_utf_count = 0;
2103                             c = 0xfffd;
2104                         } else if (c > 0x7f) {
2105                             /* First byte of a multibyte sequence received */
2106                             vc->vc_npar = 0;
2107                             if ((c & 0xe0) == 0xc0) {
2108                                 vc->vc_utf_count = 1;
2109                                 vc->vc_utf_char = (c & 0x1f);
2110                             } else if ((c & 0xf0) == 0xe0) {
2111                                 vc->vc_utf_count = 2;
2112                                 vc->vc_utf_char = (c & 0x0f);
2113                             } else if ((c & 0xf8) == 0xf0) {
2114                                 vc->vc_utf_count = 3;
2115                                 vc->vc_utf_char = (c & 0x07);
2116                             } else if ((c & 0xfc) == 0xf8) {
2117                                 vc->vc_utf_count = 4;
2118                                 vc->vc_utf_char = (c & 0x03);
2119                             } else if ((c & 0xfe) == 0xfc) {
2120                                 vc->vc_utf_count = 5;
2121                                 vc->vc_utf_char = (c & 0x01);
2122                             } else {
2123                                 /* 254 and 255 are invalid */
2124                                 c = 0xfffd;
2125                             }
2126                             if (vc->vc_utf_count) {
2127                                 /* Still need some bytes */
2128                                 continue;
2129                             }
2130                         }
2131                         /* Nothing to do if an ASCII byte was received */
2132                     }
2133                     /* End of UTF-8 decoding. */
2134                     /* c is the received character, or U+FFFD for invalid sequences. */
2135                     /* Replace invalid Unicode code points with U+FFFD too */
2136                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2137                         c = 0xfffd;
2138                     tc = c;
2139                 } else {        /* no utf or alternate charset mode */
2140                     tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2141                 }
2142
2143                 /* If the original code was a control character we
2144                  * only allow a glyph to be displayed if the code is
2145                  * not normally used (such as for cursor movement) or
2146                  * if the disp_ctrl mode has been explicitly enabled.
2147                  * Certain characters (as given by the CTRL_ALWAYS
2148                  * bitmap) are always displayed as control characters,
2149                  * as the console would be pretty useless without
2150                  * them; to display an arbitrary font position use the
2151                  * direct-to-font zone in UTF-8 mode.
2152                  */
2153                 ok = tc && (c >= 32 ||
2154                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2155                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2156                         && (c != 127 || vc->vc_disp_ctrl)
2157                         && (c != 128+27);
2158
2159                 if (vc->vc_state == ESnormal && ok) {
2160                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2161                                 if (is_double_width(c))
2162                                         width = 2;
2163                         }
2164                         /* Now try to find out how to display it */
2165                         tc = conv_uni_to_pc(vc, tc);
2166                         if (tc & ~charmask) {
2167                                 if (tc == -1 || tc == -2) {
2168                                     continue; /* nothing to display */
2169                                 }
2170                                 /* Glyph not found */
2171                                 if (!(vc->vc_utf && !vc->vc_disp_ctrl) && !(c & ~charmask)) {
2172                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2173                                        This would make absolutely no sense with Unicode in mind. */
2174                                     tc = c;
2175                                 } else {
2176                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2177                                     tc = conv_uni_to_pc(vc, 0xfffd);
2178                                     if (tc < 0) {
2179                                         inverse = 1;
2180                                         tc = conv_uni_to_pc(vc, '?');
2181                                         if (tc < 0) tc = '?';
2182                                     }
2183                                 }
2184                         }
2185
2186                         if (!inverse) {
2187                                 vc_attr = vc->vc_attr;
2188                         } else {
2189                                 /* invert vc_attr */
2190                                 if (!vc->vc_can_do_color) {
2191                                         vc_attr = (vc->vc_attr) ^ 0x08;
2192                                 } else if (vc->vc_hi_font_mask == 0x100) {
2193                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2194                                 } else {
2195                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2196                                 }
2197                         }
2198
2199                         while (1) {
2200                                 if (vc->vc_need_wrap || vc->vc_decim)
2201                                         FLUSH
2202                                 if (vc->vc_need_wrap) {
2203                                         cr(vc);
2204                                         lf(vc);
2205                                 }
2206                                 if (vc->vc_decim)
2207                                         insert_char(vc, 1);
2208                                 scr_writew(himask ?
2209                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2210                                              (vc_attr << 8) + tc,
2211                                            (u16 *) vc->vc_pos);
2212                                 if (DO_UPDATE(vc) && draw_x < 0) {
2213                                         draw_x = vc->vc_x;
2214                                         draw_from = vc->vc_pos;
2215                                 }
2216                                 if (vc->vc_x == vc->vc_cols - 1) {
2217                                         vc->vc_need_wrap = vc->vc_decawm;
2218                                         draw_to = vc->vc_pos + 2;
2219                                 } else {
2220                                         vc->vc_x++;
2221                                         draw_to = (vc->vc_pos += 2);
2222                                 }
2223
2224                                 if (!--width) break;
2225
2226                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2227                                 if (tc < 0) tc = ' ';
2228                         }
2229
2230                         if (rescan) {
2231                                 rescan = 0;
2232                                 inverse = 0;
2233                                 width = 1;
2234                                 c = orig;
2235                                 goto rescan_last_byte;
2236                         }
2237                         continue;
2238                 }
2239                 FLUSH
2240                 do_con_trol(tty, vc, orig);
2241         }
2242         FLUSH
2243         console_conditional_schedule();
2244         release_console_sem();
2245
2246 out:
2247         return n;
2248 #undef FLUSH
2249 }
2250
2251 /*
2252  * This is the console switching callback.
2253  *
2254  * Doing console switching in a process context allows
2255  * us to do the switches asynchronously (needed when we want
2256  * to switch due to a keyboard interrupt).  Synchronization
2257  * with other console code and prevention of re-entrancy is
2258  * ensured with console_sem.
2259  */
2260 static void console_callback(struct work_struct *ignored)
2261 {
2262         acquire_console_sem();
2263
2264         if (want_console >= 0) {
2265                 if (want_console != fg_console &&
2266                     vc_cons_allocated(want_console)) {
2267                         hide_cursor(vc_cons[fg_console].d);
2268                         change_console(vc_cons[want_console].d);
2269                         /* we only changed when the console had already
2270                            been allocated - a new console is not created
2271                            in an interrupt routine */
2272                 }
2273                 want_console = -1;
2274         }
2275         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2276                 do_poke_blanked_console = 0;
2277                 poke_blanked_console();
2278         }
2279         if (scrollback_delta) {
2280                 struct vc_data *vc = vc_cons[fg_console].d;
2281                 clear_selection();
2282                 if (vc->vc_mode == KD_TEXT)
2283                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2284                 scrollback_delta = 0;
2285         }
2286         if (blank_timer_expired) {
2287                 do_blank_screen(0);
2288                 blank_timer_expired = 0;
2289         }
2290
2291         release_console_sem();
2292 }
2293
2294 int set_console(int nr)
2295 {
2296         struct vc_data *vc = vc_cons[fg_console].d;
2297
2298         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2299                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2300
2301                 /*
2302                  * Console switch will fail in console_callback() or
2303                  * change_console() so there is no point scheduling
2304                  * the callback
2305                  *
2306                  * Existing set_console() users don't check the return
2307                  * value so this shouldn't break anything
2308                  */
2309                 return -EINVAL;
2310         }
2311
2312         want_console = nr;
2313         schedule_console_callback();
2314
2315         return 0;
2316 }
2317
2318 struct tty_driver *console_driver;
2319
2320 #ifdef CONFIG_VT_CONSOLE
2321
2322 /*
2323  *      Console on virtual terminal
2324  *
2325  * The console must be locked when we get here.
2326  */
2327
2328 static void vt_console_print(struct console *co, const char *b, unsigned count)
2329 {
2330         struct vc_data *vc = vc_cons[fg_console].d;
2331         unsigned char c;
2332         static unsigned long printing;
2333         const ushort *start;
2334         ushort cnt = 0;
2335         ushort myx;
2336
2337         /* console busy or not yet initialized */
2338         if (!printable || test_and_set_bit(0, &printing))
2339                 return;
2340
2341         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2342                 vc = vc_cons[kmsg_redirect - 1].d;
2343
2344         /* read `x' only after setting currcons properly (otherwise
2345            the `x' macro will read the x of the foreground console). */
2346         myx = vc->vc_x;
2347
2348         if (!vc_cons_allocated(fg_console)) {
2349                 /* impossible */
2350                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2351                 goto quit;
2352         }
2353
2354         if (vc->vc_mode != KD_TEXT)
2355                 goto quit;
2356
2357         /* undraw cursor first */
2358         if (IS_FG(vc))
2359                 hide_cursor(vc);
2360
2361         start = (ushort *)vc->vc_pos;
2362
2363         /* Contrived structure to try to emulate original need_wrap behaviour
2364          * Problems caused when we have need_wrap set on '\n' character */
2365         while (count--) {
2366                 c = *b++;
2367                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2368                         if (cnt > 0) {
2369                                 if (CON_IS_VISIBLE(vc))
2370                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2371                                 vc->vc_x += cnt;
2372                                 if (vc->vc_need_wrap)
2373                                         vc->vc_x--;
2374                                 cnt = 0;
2375                         }
2376                         if (c == 8) {           /* backspace */
2377                                 bs(vc);
2378                                 start = (ushort *)vc->vc_pos;
2379                                 myx = vc->vc_x;
2380                                 continue;
2381                         }
2382                         if (c != 13)
2383                                 lf(vc);
2384                         cr(vc);
2385                         start = (ushort *)vc->vc_pos;
2386                         myx = vc->vc_x;
2387                         if (c == 10 || c == 13)
2388                                 continue;
2389                 }
2390                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2391                 cnt++;
2392                 if (myx == vc->vc_cols - 1) {
2393                         vc->vc_need_wrap = 1;
2394                         continue;
2395                 }
2396                 vc->vc_pos += 2;
2397                 myx++;
2398         }
2399         if (cnt > 0) {
2400                 if (CON_IS_VISIBLE(vc))
2401                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2402                 vc->vc_x += cnt;
2403                 if (vc->vc_x == vc->vc_cols) {
2404                         vc->vc_x--;
2405                         vc->vc_need_wrap = 1;
2406                 }
2407         }
2408         set_cursor(vc);
2409
2410 quit:
2411         clear_bit(0, &printing);
2412 }
2413
2414 static struct tty_driver *vt_console_device(struct console *c, int *index)
2415 {
2416         *index = c->index ? c->index-1 : fg_console;
2417         return console_driver;
2418 }
2419
2420 static struct console vt_console_driver = {
2421         .name           = "tty",
2422         .write          = vt_console_print,
2423         .device         = vt_console_device,
2424         .unblank        = unblank_screen,
2425         .flags          = CON_PRINTBUFFER,
2426         .index          = -1,
2427 };
2428 #endif
2429
2430 /*
2431  *      Handling of Linux-specific VC ioctls
2432  */
2433
2434 /*
2435  * Generally a bit racy with respect to console_sem().
2436  *
2437  * There are some functions which don't need it.
2438  *
2439  * There are some functions which can sleep for arbitrary periods
2440  * (paste_selection) but we don't need the lock there anyway.
2441  *
2442  * set_selection has locking, and definitely needs it
2443  */
2444
2445 int tioclinux(struct tty_struct *tty, unsigned long arg)
2446 {
2447         char type, data;
2448         char __user *p = (char __user *)arg;
2449         int lines;
2450         int ret;
2451
2452         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2453                 return -EINVAL;
2454         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2455                 return -EPERM;
2456         if (get_user(type, p))
2457                 return -EFAULT;
2458         ret = 0;
2459         switch (type)
2460         {
2461                 case TIOCL_SETSEL:
2462                         acquire_console_sem();
2463                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2464                         release_console_sem();
2465                         break;
2466                 case TIOCL_PASTESEL:
2467                         ret = paste_selection(tty);
2468                         break;
2469                 case TIOCL_UNBLANKSCREEN:
2470                         acquire_console_sem();
2471                         unblank_screen();
2472                         release_console_sem();
2473                         break;
2474                 case TIOCL_SELLOADLUT:
2475                         ret = sel_loadlut(p);
2476                         break;
2477                 case TIOCL_GETSHIFTSTATE:
2478
2479         /*
2480          * Make it possible to react to Shift+Mousebutton.
2481          * Note that 'shift_state' is an undocumented
2482          * kernel-internal variable; programs not closely
2483          * related to the kernel should not use this.
2484          */
2485                         data = shift_state;
2486                         ret = __put_user(data, p);
2487                         break;
2488                 case TIOCL_GETMOUSEREPORTING:
2489                         data = mouse_reporting();
2490                         ret = __put_user(data, p);
2491                         break;
2492                 case TIOCL_SETVESABLANK:
2493                         ret = set_vesa_blanking(p);
2494                         break;
2495                 case TIOCL_GETKMSGREDIRECT:
2496                         data = kmsg_redirect;
2497                         ret = __put_user(data, p);
2498                         break;
2499                 case TIOCL_SETKMSGREDIRECT:
2500                         if (!capable(CAP_SYS_ADMIN)) {
2501                                 ret = -EPERM;
2502                         } else {
2503                                 if (get_user(data, p+1))
2504                                         ret = -EFAULT;
2505                                 else
2506                                         kmsg_redirect = data;
2507                         }
2508                         break;
2509                 case TIOCL_GETFGCONSOLE:
2510                         ret = fg_console;
2511                         break;
2512                 case TIOCL_SCROLLCONSOLE:
2513                         if (get_user(lines, (s32 __user *)(p+4))) {
2514                                 ret = -EFAULT;
2515                         } else {
2516                                 scrollfront(vc_cons[fg_console].d, lines);
2517                                 ret = 0;
2518                         }
2519                         break;
2520                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2521                         acquire_console_sem();
2522                         ignore_poke = 1;
2523                         do_blank_screen(0);
2524                         release_console_sem();
2525                         break;
2526                 case TIOCL_BLANKEDSCREEN:
2527                         ret = console_blanked;
2528                         break;
2529                 default:
2530                         ret = -EINVAL;
2531                         break;
2532         }
2533         return ret;
2534 }
2535
2536 /*
2537  * /dev/ttyN handling
2538  */
2539
2540 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2541 {
2542         int     retval;
2543
2544         retval = do_con_write(tty, buf, count);
2545         con_flush_chars(tty);
2546
2547         return retval;
2548 }
2549
2550 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2551 {
2552         if (in_interrupt())
2553                 return; /* n_r3964 calls put_char() from interrupt context */
2554         do_con_write(tty, &ch, 1);
2555 }
2556
2557 static int con_write_room(struct tty_struct *tty)
2558 {
2559         if (tty->stopped)
2560                 return 0;
2561         return 4096;            /* No limit, really; we're not buffering */
2562 }
2563
2564 static int con_chars_in_buffer(struct tty_struct *tty)
2565 {
2566         return 0;               /* we're not buffering */
2567 }
2568
2569 /*
2570  * con_throttle and con_unthrottle are only used for
2571  * paste_selection(), which has to stuff in a large number of
2572  * characters...
2573  */
2574 static void con_throttle(struct tty_struct *tty)
2575 {
2576 }
2577
2578 static void con_unthrottle(struct tty_struct *tty)
2579 {
2580         struct vc_data *vc = tty->driver_data;
2581
2582         wake_up_interruptible(&vc->paste_wait);
2583 }
2584
2585 /*
2586  * Turn the Scroll-Lock LED on when the tty is stopped
2587  */
2588 static void con_stop(struct tty_struct *tty)
2589 {
2590         int console_num;
2591         if (!tty)
2592                 return;
2593         console_num = tty->index;
2594         if (!vc_cons_allocated(console_num))
2595                 return;
2596         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2597         set_leds();
2598 }
2599
2600 /*
2601  * Turn the Scroll-Lock LED off when the console is started
2602  */
2603 static void con_start(struct tty_struct *tty)
2604 {
2605         int console_num;
2606         if (!tty)
2607                 return;
2608         console_num = tty->index;
2609         if (!vc_cons_allocated(console_num))
2610                 return;
2611         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2612         set_leds();
2613 }
2614
2615 static void con_flush_chars(struct tty_struct *tty)
2616 {
2617         struct vc_data *vc;
2618
2619         if (in_interrupt())     /* from flush_to_ldisc */
2620                 return;
2621
2622         /* if we race with con_close(), vt may be null */
2623         acquire_console_sem();
2624         vc = tty->driver_data;
2625         if (vc)
2626                 set_cursor(vc);
2627         release_console_sem();
2628 }
2629
2630 /*
2631  * Allocate the console screen memory.
2632  */
2633 static int con_open(struct tty_struct *tty, struct file *filp)
2634 {
2635         unsigned int currcons = tty->index;
2636         int ret = 0;
2637
2638         acquire_console_sem();
2639         if (tty->driver_data == NULL) {
2640                 ret = vc_allocate(currcons);
2641                 if (ret == 0) {
2642                         struct vc_data *vc = vc_cons[currcons].d;
2643                         tty->driver_data = vc;
2644                         vc->vc_tty = tty;
2645
2646                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2647                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2648                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2649                         }
2650                         release_console_sem();
2651                         vcs_make_sysfs(tty);
2652                         return ret;
2653                 }
2654         }
2655         release_console_sem();
2656         return ret;
2657 }
2658
2659 /*
2660  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2661  * and taking a ref against the tty while we're in the process of forgetting
2662  * about it and cleaning things up.
2663  *
2664  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2665  */
2666 static void con_close(struct tty_struct *tty, struct file *filp)
2667 {
2668         mutex_lock(&tty_mutex);
2669         acquire_console_sem();
2670         if (tty && tty->count == 1) {
2671                 struct vc_data *vc = tty->driver_data;
2672
2673                 if (vc)
2674                         vc->vc_tty = NULL;
2675                 tty->driver_data = NULL;
2676                 release_console_sem();
2677                 vcs_remove_sysfs(tty);
2678                 mutex_unlock(&tty_mutex);
2679                 /*
2680                  * tty_mutex is released, but we still hold BKL, so there is
2681                  * still exclusion against init_dev()
2682                  */
2683                 return;
2684         }
2685         release_console_sem();
2686         mutex_unlock(&tty_mutex);
2687 }
2688
2689 static void vc_init(struct vc_data *vc, unsigned int rows,
2690                     unsigned int cols, int do_clear)
2691 {
2692         int j, k ;
2693
2694         vc->vc_cols = cols;
2695         vc->vc_rows = rows;
2696         vc->vc_size_row = cols << 1;
2697         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2698
2699         set_origin(vc);
2700         vc->vc_pos = vc->vc_origin;
2701         reset_vc(vc);
2702         for (j=k=0; j<16; j++) {
2703                 vc->vc_palette[k++] = default_red[j] ;
2704                 vc->vc_palette[k++] = default_grn[j] ;
2705                 vc->vc_palette[k++] = default_blu[j] ;
2706         }
2707         vc->vc_def_color       = 0x07;   /* white */
2708         vc->vc_ulcolor          = 0x0f;   /* bold white */
2709         vc->vc_halfcolor       = 0x08;   /* grey */
2710         init_waitqueue_head(&vc->paste_wait);
2711         reset_terminal(vc, do_clear);
2712 }
2713
2714 /*
2715  * This routine initializes console interrupts, and does nothing
2716  * else. If you want the screen to clear, call tty_write with
2717  * the appropriate escape-sequence.
2718  */
2719
2720 static int __init con_init(void)
2721 {
2722         const char *display_desc = NULL;
2723         struct vc_data *vc;
2724         unsigned int currcons = 0, i;
2725
2726         acquire_console_sem();
2727
2728         if (conswitchp)
2729                 display_desc = conswitchp->con_startup();
2730         if (!display_desc) {
2731                 fg_console = 0;
2732                 release_console_sem();
2733                 return 0;
2734         }
2735
2736         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2737                 struct con_driver *con_driver = &registered_con_driver[i];
2738
2739                 if (con_driver->con == NULL) {
2740                         con_driver->con = conswitchp;
2741                         con_driver->desc = display_desc;
2742                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2743                         con_driver->first = 0;
2744                         con_driver->last = MAX_NR_CONSOLES - 1;
2745                         break;
2746                 }
2747         }
2748
2749         for (i = 0; i < MAX_NR_CONSOLES; i++)
2750                 con_driver_map[i] = conswitchp;
2751
2752         if (blankinterval) {
2753                 blank_state = blank_normal_wait;
2754                 mod_timer(&console_timer, jiffies + blankinterval);
2755         }
2756
2757         /*
2758          * kmalloc is not running yet - we use the bootmem allocator.
2759          */
2760         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2761                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2762                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2763                 visual_init(vc, currcons, 1);
2764                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2765                 vc->vc_kmalloced = 0;
2766                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2767                         currcons || !vc->vc_sw->con_save_screen);
2768         }
2769         currcons = fg_console = 0;
2770         master_display_fg = vc = vc_cons[currcons].d;
2771         set_origin(vc);
2772         save_screen(vc);
2773         gotoxy(vc, vc->vc_x, vc->vc_y);
2774         csi_J(vc, 0);
2775         update_screen(vc);
2776         printk("Console: %s %s %dx%d",
2777                 vc->vc_can_do_color ? "colour" : "mono",
2778                 display_desc, vc->vc_cols, vc->vc_rows);
2779         printable = 1;
2780         printk("\n");
2781
2782         release_console_sem();
2783
2784 #ifdef CONFIG_VT_CONSOLE
2785         register_console(&vt_console_driver);
2786 #endif
2787         return 0;
2788 }
2789 console_initcall(con_init);
2790
2791 static const struct tty_operations con_ops = {
2792         .open = con_open,
2793         .close = con_close,
2794         .write = con_write,
2795         .write_room = con_write_room,
2796         .put_char = con_put_char,
2797         .flush_chars = con_flush_chars,
2798         .chars_in_buffer = con_chars_in_buffer,
2799         .ioctl = vt_ioctl,
2800         .stop = con_stop,
2801         .start = con_start,
2802         .throttle = con_throttle,
2803         .unthrottle = con_unthrottle,
2804 };
2805
2806 int __init vty_init(void)
2807 {
2808         vcs_init();
2809
2810         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2811         if (!console_driver)
2812                 panic("Couldn't allocate console driver\n");
2813         console_driver->owner = THIS_MODULE;
2814         console_driver->name = "tty";
2815         console_driver->name_base = 1;
2816         console_driver->major = TTY_MAJOR;
2817         console_driver->minor_start = 1;
2818         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2819         console_driver->init_termios = tty_std_termios;
2820         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2821         tty_set_operations(console_driver, &con_ops);
2822         if (tty_register_driver(console_driver))
2823                 panic("Couldn't register console driver\n");
2824
2825         kbd_init();
2826         console_map_init();
2827 #ifdef CONFIG_PROM_CONSOLE
2828         prom_con_init();
2829 #endif
2830 #ifdef CONFIG_MDA_CONSOLE
2831         mda_console_init();
2832 #endif
2833         return 0;
2834 }
2835
2836 #ifndef VT_SINGLE_DRIVER
2837 #include <linux/device.h>
2838
2839 static struct class *vtconsole_class;
2840
2841 static int bind_con_driver(const struct consw *csw, int first, int last,
2842                            int deflt)
2843 {
2844         struct module *owner = csw->owner;
2845         const char *desc = NULL;
2846         struct con_driver *con_driver;
2847         int i, j = -1, k = -1, retval = -ENODEV;
2848
2849         if (!try_module_get(owner))
2850                 return -ENODEV;
2851
2852         acquire_console_sem();
2853
2854         /* check if driver is registered */
2855         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2856                 con_driver = &registered_con_driver[i];
2857
2858                 if (con_driver->con == csw) {
2859                         desc = con_driver->desc;
2860                         retval = 0;
2861                         break;
2862                 }
2863         }
2864
2865         if (retval)
2866                 goto err;
2867
2868         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2869                 csw->con_startup();
2870                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2871         }
2872
2873         if (deflt) {
2874                 if (conswitchp)
2875                         module_put(conswitchp->owner);
2876
2877                 __module_get(owner);
2878                 conswitchp = csw;
2879         }
2880
2881         first = max(first, con_driver->first);
2882         last = min(last, con_driver->last);
2883
2884         for (i = first; i <= last; i++) {
2885                 int old_was_color;
2886                 struct vc_data *vc = vc_cons[i].d;
2887
2888                 if (con_driver_map[i])
2889                         module_put(con_driver_map[i]->owner);
2890                 __module_get(owner);
2891                 con_driver_map[i] = csw;
2892
2893                 if (!vc || !vc->vc_sw)
2894                         continue;
2895
2896                 j = i;
2897
2898                 if (CON_IS_VISIBLE(vc)) {
2899                         k = i;
2900                         save_screen(vc);
2901                 }
2902
2903                 old_was_color = vc->vc_can_do_color;
2904                 vc->vc_sw->con_deinit(vc);
2905                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2906                 visual_init(vc, i, 0);
2907                 set_origin(vc);
2908                 update_attr(vc);
2909
2910                 /* If the console changed between mono <-> color, then
2911                  * the attributes in the screenbuf will be wrong.  The
2912                  * following resets all attributes to something sane.
2913                  */
2914                 if (old_was_color != vc->vc_can_do_color)
2915                         clear_buffer_attributes(vc);
2916         }
2917
2918         printk("Console: switching ");
2919         if (!deflt)
2920                 printk("consoles %d-%d ", first+1, last+1);
2921         if (j >= 0) {
2922                 struct vc_data *vc = vc_cons[j].d;
2923
2924                 printk("to %s %s %dx%d\n",
2925                        vc->vc_can_do_color ? "colour" : "mono",
2926                        desc, vc->vc_cols, vc->vc_rows);
2927
2928                 if (k >= 0) {
2929                         vc = vc_cons[k].d;
2930                         update_screen(vc);
2931                 }
2932         } else
2933                 printk("to %s\n", desc);
2934
2935         retval = 0;
2936 err:
2937         release_console_sem();
2938         module_put(owner);
2939         return retval;
2940 };
2941
2942 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2943 static int con_is_graphics(const struct consw *csw, int first, int last)
2944 {
2945         int i, retval = 0;
2946
2947         for (i = first; i <= last; i++) {
2948                 struct vc_data *vc = vc_cons[i].d;
2949
2950                 if (vc && vc->vc_mode == KD_GRAPHICS) {
2951                         retval = 1;
2952                         break;
2953                 }
2954         }
2955
2956         return retval;
2957 }
2958
2959 static int unbind_con_driver(const struct consw *csw, int first, int last,
2960                              int deflt)
2961 {
2962         struct module *owner = csw->owner;
2963         const struct consw *defcsw = NULL;
2964         struct con_driver *con_driver = NULL, *con_back = NULL;
2965         int i, retval = -ENODEV;
2966
2967         if (!try_module_get(owner))
2968                 return -ENODEV;
2969
2970         acquire_console_sem();
2971
2972         /* check if driver is registered and if it is unbindable */
2973         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2974                 con_driver = &registered_con_driver[i];
2975
2976                 if (con_driver->con == csw &&
2977                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
2978                         retval = 0;
2979                         break;
2980                 }
2981         }
2982
2983         if (retval) {
2984                 release_console_sem();
2985                 goto err;
2986         }
2987
2988         retval = -ENODEV;
2989
2990         /* check if backup driver exists */
2991         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2992                 con_back = &registered_con_driver[i];
2993
2994                 if (con_back->con &&
2995                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
2996                         defcsw = con_back->con;
2997                         retval = 0;
2998                         break;
2999                 }
3000         }
3001
3002         if (retval) {
3003                 release_console_sem();
3004                 goto err;
3005         }
3006
3007         if (!con_is_bound(csw)) {
3008                 release_console_sem();
3009                 goto err;
3010         }
3011
3012         first = max(first, con_driver->first);
3013         last = min(last, con_driver->last);
3014
3015         for (i = first; i <= last; i++) {
3016                 if (con_driver_map[i] == csw) {
3017                         module_put(csw->owner);
3018                         con_driver_map[i] = NULL;
3019                 }
3020         }
3021
3022         if (!con_is_bound(defcsw)) {
3023                 const struct consw *defconsw = conswitchp;
3024
3025                 defcsw->con_startup();
3026                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3027                 /*
3028                  * vgacon may change the default driver to point
3029                  * to dummycon, we restore it here...
3030                  */
3031                 conswitchp = defconsw;
3032         }
3033
3034         if (!con_is_bound(csw))
3035                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3036
3037         release_console_sem();
3038         /* ignore return value, binding should not fail */
3039         bind_con_driver(defcsw, first, last, deflt);
3040 err:
3041         module_put(owner);
3042         return retval;
3043
3044 }
3045
3046 static int vt_bind(struct con_driver *con)
3047 {
3048         const struct consw *defcsw = NULL, *csw = NULL;
3049         int i, more = 1, first = -1, last = -1, deflt = 0;
3050
3051         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3052             con_is_graphics(con->con, con->first, con->last))
3053                 goto err;
3054
3055         csw = con->con;
3056
3057         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3058                 struct con_driver *con = &registered_con_driver[i];
3059
3060                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3061                         defcsw = con->con;
3062                         break;
3063                 }
3064         }
3065
3066         if (!defcsw)
3067                 goto err;
3068
3069         while (more) {
3070                 more = 0;
3071
3072                 for (i = con->first; i <= con->last; i++) {
3073                         if (con_driver_map[i] == defcsw) {
3074                                 if (first == -1)
3075                                         first = i;
3076                                 last = i;
3077                                 more = 1;
3078                         } else if (first != -1)
3079                                 break;
3080                 }
3081
3082                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3083                         deflt = 1;
3084
3085                 if (first != -1)
3086                         bind_con_driver(csw, first, last, deflt);
3087
3088                 first = -1;
3089                 last = -1;
3090                 deflt = 0;
3091         }
3092
3093 err:
3094         return 0;
3095 }
3096
3097 static int vt_unbind(struct con_driver *con)
3098 {
3099         const struct consw *csw = NULL;
3100         int i, more = 1, first = -1, last = -1, deflt = 0;
3101
3102         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3103             con_is_graphics(con->con, con->first, con->last))
3104                 goto err;
3105
3106         csw = con->con;
3107
3108         while (more) {
3109                 more = 0;
3110
3111                 for (i = con->first; i <= con->last; i++) {
3112                         if (con_driver_map[i] == csw) {
3113                                 if (first == -1)
3114                                         first = i;
3115                                 last = i;
3116                                 more = 1;
3117                         } else if (first != -1)
3118                                 break;
3119                 }
3120
3121                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3122                         deflt = 1;
3123
3124                 if (first != -1)
3125                         unbind_con_driver(csw, first, last, deflt);
3126
3127                 first = -1;
3128                 last = -1;
3129                 deflt = 0;
3130         }
3131
3132 err:
3133         return 0;
3134 }
3135 #else
3136 static inline int vt_bind(struct con_driver *con)
3137 {
3138         return 0;
3139 }
3140 static inline int vt_unbind(struct con_driver *con)
3141 {
3142         return 0;
3143 }
3144 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3145
3146 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3147                           const char *buf, size_t count)
3148 {
3149         struct con_driver *con = dev_get_drvdata(dev);
3150         int bind = simple_strtoul(buf, NULL, 0);
3151
3152         if (bind)
3153                 vt_bind(con);
3154         else
3155                 vt_unbind(con);
3156
3157         return count;
3158 }
3159
3160 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3161                          char *buf)
3162 {
3163         struct con_driver *con = dev_get_drvdata(dev);
3164         int bind = con_is_bound(con->con);
3165
3166         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3167 }
3168
3169 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3170                          char *buf)
3171 {
3172         struct con_driver *con = dev_get_drvdata(dev);
3173
3174         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3175                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3176                          con->desc);
3177
3178 }
3179
3180 static struct device_attribute device_attrs[] = {
3181         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3182         __ATTR(name, S_IRUGO, show_name, NULL),
3183 };
3184
3185 static int vtconsole_init_device(struct con_driver *con)
3186 {
3187         int i;
3188         int error = 0;
3189
3190         con->flag |= CON_DRIVER_FLAG_ATTR;
3191         dev_set_drvdata(con->dev, con);
3192         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3193                 error = device_create_file(con->dev, &device_attrs[i]);
3194                 if (error)
3195                         break;
3196         }
3197
3198         if (error) {
3199                 while (--i >= 0)
3200                         device_remove_file(con->dev, &device_attrs[i]);
3201                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3202         }
3203
3204         return error;
3205 }
3206
3207 static void vtconsole_deinit_device(struct con_driver *con)
3208 {
3209         int i;
3210
3211         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3212                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3213                         device_remove_file(con->dev, &device_attrs[i]);
3214                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3215         }
3216 }
3217
3218 /**
3219  * con_is_bound - checks if driver is bound to the console
3220  * @csw: console driver
3221  *
3222  * RETURNS: zero if unbound, nonzero if bound
3223  *
3224  * Drivers can call this and if zero, they should release
3225  * all resources allocated on con_startup()
3226  */
3227 int con_is_bound(const struct consw *csw)
3228 {
3229         int i, bound = 0;
3230
3231         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3232                 if (con_driver_map[i] == csw) {
3233                         bound = 1;
3234                         break;
3235                 }
3236         }
3237
3238         return bound;
3239 }
3240 EXPORT_SYMBOL(con_is_bound);
3241
3242 /**
3243  * register_con_driver - register console driver to console layer
3244  * @csw: console driver
3245  * @first: the first console to take over, minimum value is 0
3246  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3247  *
3248  * DESCRIPTION: This function registers a console driver which can later
3249  * bind to a range of consoles specified by @first and @last. It will
3250  * also initialize the console driver by calling con_startup().
3251  */
3252 int register_con_driver(const struct consw *csw, int first, int last)
3253 {
3254         struct module *owner = csw->owner;
3255         struct con_driver *con_driver;
3256         const char *desc;
3257         int i, retval = 0;
3258
3259         if (!try_module_get(owner))
3260                 return -ENODEV;
3261
3262         acquire_console_sem();
3263
3264         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3265                 con_driver = &registered_con_driver[i];
3266
3267                 /* already registered */
3268                 if (con_driver->con == csw)
3269                         retval = -EINVAL;
3270         }
3271
3272         if (retval)
3273                 goto err;
3274
3275         desc = csw->con_startup();
3276
3277         if (!desc)
3278                 goto err;
3279
3280         retval = -EINVAL;
3281
3282         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3283                 con_driver = &registered_con_driver[i];
3284
3285                 if (con_driver->con == NULL) {
3286                         con_driver->con = csw;
3287                         con_driver->desc = desc;
3288                         con_driver->node = i;
3289                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3290                                            CON_DRIVER_FLAG_INIT;
3291                         con_driver->first = first;
3292                         con_driver->last = last;
3293                         retval = 0;
3294                         break;
3295                 }
3296         }
3297
3298         if (retval)
3299                 goto err;
3300
3301         con_driver->dev = device_create(vtconsole_class, NULL,
3302                                         MKDEV(0, con_driver->node),
3303                                         "vtcon%i", con_driver->node);
3304
3305         if (IS_ERR(con_driver->dev)) {
3306                 printk(KERN_WARNING "Unable to create device for %s; "
3307                        "errno = %ld\n", con_driver->desc,
3308                        PTR_ERR(con_driver->dev));
3309                 con_driver->dev = NULL;
3310         } else {
3311                 vtconsole_init_device(con_driver);
3312         }
3313
3314 err:
3315         release_console_sem();
3316         module_put(owner);
3317         return retval;
3318 }
3319 EXPORT_SYMBOL(register_con_driver);
3320
3321 /**
3322  * unregister_con_driver - unregister console driver from console layer
3323  * @csw: console driver
3324  *
3325  * DESCRIPTION: All drivers that registers to the console layer must
3326  * call this function upon exit, or if the console driver is in a state
3327  * where it won't be able to handle console services, such as the
3328  * framebuffer console without loaded framebuffer drivers.
3329  *
3330  * The driver must unbind first prior to unregistration.
3331  */
3332 int unregister_con_driver(const struct consw *csw)
3333 {
3334         int i, retval = -ENODEV;
3335
3336         acquire_console_sem();
3337
3338         /* cannot unregister a bound driver */
3339         if (con_is_bound(csw))
3340                 goto err;
3341
3342         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3343                 struct con_driver *con_driver = &registered_con_driver[i];
3344
3345                 if (con_driver->con == csw &&
3346                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3347                         vtconsole_deinit_device(con_driver);
3348                         device_destroy(vtconsole_class,
3349                                        MKDEV(0, con_driver->node));
3350                         con_driver->con = NULL;
3351                         con_driver->desc = NULL;
3352                         con_driver->dev = NULL;
3353                         con_driver->node = 0;
3354                         con_driver->flag = 0;
3355                         con_driver->first = 0;
3356                         con_driver->last = 0;
3357                         retval = 0;
3358                         break;
3359                 }
3360         }
3361 err:
3362         release_console_sem();
3363         return retval;
3364 }
3365 EXPORT_SYMBOL(unregister_con_driver);
3366
3367 /*
3368  *      If we support more console drivers, this function is used
3369  *      when a driver wants to take over some existing consoles
3370  *      and become default driver for newly opened ones.
3371  *
3372  *      take_over_console is basically a register followed by unbind
3373  */
3374 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3375 {
3376         int err;
3377
3378         err = register_con_driver(csw, first, last);
3379
3380         if (!err)
3381                 bind_con_driver(csw, first, last, deflt);
3382
3383         return err;
3384 }
3385
3386 /*
3387  * give_up_console is a wrapper to unregister_con_driver. It will only
3388  * work if driver is fully unbound.
3389  */
3390 void give_up_console(const struct consw *csw)
3391 {
3392         unregister_con_driver(csw);
3393 }
3394
3395 static int __init vtconsole_class_init(void)
3396 {
3397         int i;
3398
3399         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3400         if (IS_ERR(vtconsole_class)) {
3401                 printk(KERN_WARNING "Unable to create vt console class; "
3402                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3403                 vtconsole_class = NULL;
3404         }
3405
3406         /* Add system drivers to sysfs */
3407         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3408                 struct con_driver *con = &registered_con_driver[i];
3409
3410                 if (con->con && !con->dev) {
3411                         con->dev = device_create(vtconsole_class, NULL,
3412                                                  MKDEV(0, con->node),
3413                                                  "vtcon%i", con->node);
3414
3415                         if (IS_ERR(con->dev)) {
3416                                 printk(KERN_WARNING "Unable to create "
3417                                        "device for %s; errno = %ld\n",
3418                                        con->desc, PTR_ERR(con->dev));
3419                                 con->dev = NULL;
3420                         } else {
3421                                 vtconsole_init_device(con);
3422                         }
3423                 }
3424         }
3425
3426         return 0;
3427 }
3428 postcore_initcall(vtconsole_class_init);
3429
3430 #endif
3431
3432 /*
3433  *      Screen blanking
3434  */
3435
3436 static int set_vesa_blanking(char __user *p)
3437 {
3438         unsigned int mode;
3439
3440         if (get_user(mode, p + 1))
3441                 return -EFAULT;
3442
3443         vesa_blank_mode = (mode < 4) ? mode : 0;
3444         return 0;
3445 }
3446
3447 void do_blank_screen(int entering_gfx)
3448 {
3449         struct vc_data *vc = vc_cons[fg_console].d;
3450         int i;
3451
3452         WARN_CONSOLE_UNLOCKED();
3453
3454         if (console_blanked) {
3455                 if (blank_state == blank_vesa_wait) {
3456                         blank_state = blank_off;
3457                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3458                 }
3459                 return;
3460         }
3461         if (blank_state != blank_normal_wait)
3462                 return;
3463         blank_state = blank_off;
3464
3465         /* entering graphics mode? */
3466         if (entering_gfx) {
3467                 hide_cursor(vc);
3468                 save_screen(vc);
3469                 vc->vc_sw->con_blank(vc, -1, 1);
3470                 console_blanked = fg_console + 1;
3471                 set_origin(vc);
3472                 return;
3473         }
3474
3475         /* don't blank graphics */
3476         if (vc->vc_mode != KD_TEXT) {
3477                 console_blanked = fg_console + 1;
3478                 return;
3479         }
3480
3481         hide_cursor(vc);
3482         del_timer_sync(&console_timer);
3483         blank_timer_expired = 0;
3484
3485         save_screen(vc);
3486         /* In case we need to reset origin, blanking hook returns 1 */
3487         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3488         console_blanked = fg_console + 1;
3489         if (i)
3490                 set_origin(vc);
3491
3492         if (console_blank_hook && console_blank_hook(1))
3493                 return;
3494
3495         if (vesa_off_interval && vesa_blank_mode) {
3496                 blank_state = blank_vesa_wait;
3497                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3498         }
3499 }
3500 EXPORT_SYMBOL(do_blank_screen);
3501
3502 /*
3503  * Called by timer as well as from vt_console_driver
3504  */
3505 void do_unblank_screen(int leaving_gfx)
3506 {
3507         struct vc_data *vc;
3508
3509         /* This should now always be called from a "sane" (read: can schedule)
3510          * context for the sake of the low level drivers, except in the special
3511          * case of oops_in_progress
3512          */
3513         if (!oops_in_progress)
3514                 might_sleep();
3515
3516         WARN_CONSOLE_UNLOCKED();
3517
3518         ignore_poke = 0;
3519         if (!console_blanked)
3520                 return;
3521         if (!vc_cons_allocated(fg_console)) {
3522                 /* impossible */
3523                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3524                 return;
3525         }
3526         vc = vc_cons[fg_console].d;
3527         if (vc->vc_mode != KD_TEXT)
3528                 return; /* but leave console_blanked != 0 */
3529
3530         if (blankinterval) {
3531                 mod_timer(&console_timer, jiffies + blankinterval);
3532                 blank_state = blank_normal_wait;
3533         }
3534
3535         console_blanked = 0;
3536         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3537                 /* Low-level driver cannot restore -> do it ourselves */
3538                 update_screen(vc);
3539         if (console_blank_hook)
3540                 console_blank_hook(0);
3541         set_palette(vc);
3542         set_cursor(vc);
3543 }
3544 EXPORT_SYMBOL(do_unblank_screen);
3545
3546 /*
3547  * This is called by the outside world to cause a forced unblank, mostly for
3548  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3549  * call it with 1 as an argument and so force a mode restore... that may kill
3550  * X or at least garbage the screen but would also make the Oops visible...
3551  */
3552 void unblank_screen(void)
3553 {
3554         do_unblank_screen(0);
3555 }
3556
3557 /*
3558  * We defer the timer blanking to work queue so it can take the console mutex
3559  * (console operations can still happen at irq time, but only from printk which
3560  * has the console mutex. Not perfect yet, but better than no locking
3561  */
3562 static void blank_screen_t(unsigned long dummy)
3563 {
3564         if (unlikely(!keventd_up())) {
3565                 mod_timer(&console_timer, jiffies + blankinterval);
3566                 return;
3567         }
3568         blank_timer_expired = 1;
3569         schedule_work(&console_work);
3570 }
3571
3572 void poke_blanked_console(void)
3573 {
3574         WARN_CONSOLE_UNLOCKED();
3575
3576         /* Add this so we quickly catch whoever might call us in a non
3577          * safe context. Nowadays, unblank_screen() isn't to be called in
3578          * atomic contexts and is allowed to schedule (with the special case
3579          * of oops_in_progress, but that isn't of any concern for this
3580          * function. --BenH.
3581          */
3582         might_sleep();
3583
3584         /* This isn't perfectly race free, but a race here would be mostly harmless,
3585          * at worse, we'll do a spurrious blank and it's unlikely
3586          */
3587         del_timer(&console_timer);
3588         blank_timer_expired = 0;
3589
3590         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3591                 return;
3592         if (console_blanked)
3593                 unblank_screen();
3594         else if (blankinterval) {
3595                 mod_timer(&console_timer, jiffies + blankinterval);
3596                 blank_state = blank_normal_wait;
3597         }
3598 }
3599
3600 /*
3601  *      Palettes
3602  */
3603
3604 static void set_palette(struct vc_data *vc)
3605 {
3606         WARN_CONSOLE_UNLOCKED();
3607
3608         if (vc->vc_mode != KD_GRAPHICS)
3609                 vc->vc_sw->con_set_palette(vc, color_table);
3610 }
3611
3612 static int set_get_cmap(unsigned char __user *arg, int set)
3613 {
3614     int i, j, k;
3615
3616     WARN_CONSOLE_UNLOCKED();
3617
3618     for (i = 0; i < 16; i++)
3619         if (set) {
3620             get_user(default_red[i], arg++);
3621             get_user(default_grn[i], arg++);
3622             get_user(default_blu[i], arg++);
3623         } else {
3624             put_user(default_red[i], arg++);
3625             put_user(default_grn[i], arg++);
3626             put_user(default_blu[i], arg++);
3627         }
3628     if (set) {
3629         for (i = 0; i < MAX_NR_CONSOLES; i++)
3630             if (vc_cons_allocated(i)) {
3631                 for (j = k = 0; j < 16; j++) {
3632                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3633                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3634                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3635                 }
3636                 set_palette(vc_cons[i].d);
3637             }
3638     }
3639     return 0;
3640 }
3641
3642 /*
3643  * Load palette into the DAC registers. arg points to a colour
3644  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3645  */
3646
3647 int con_set_cmap(unsigned char __user *arg)
3648 {
3649         int rc;
3650
3651         acquire_console_sem();
3652         rc = set_get_cmap (arg,1);
3653         release_console_sem();
3654
3655         return rc;
3656 }
3657
3658 int con_get_cmap(unsigned char __user *arg)
3659 {
3660         int rc;
3661
3662         acquire_console_sem();
3663         rc = set_get_cmap (arg,0);
3664         release_console_sem();
3665
3666         return rc;
3667 }
3668
3669 void reset_palette(struct vc_data *vc)
3670 {
3671         int j, k;
3672         for (j=k=0; j<16; j++) {
3673                 vc->vc_palette[k++] = default_red[j];
3674                 vc->vc_palette[k++] = default_grn[j];
3675                 vc->vc_palette[k++] = default_blu[j];
3676         }
3677         set_palette(vc);
3678 }
3679
3680 /*
3681  *  Font switching
3682  *
3683  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3684  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3685  *  depending on width) reserved for each character which is kinda wasty, but
3686  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3687  *  is upto the actual low-level console-driver convert data into its favorite
3688  *  format (maybe we should add a `fontoffset' field to the `display'
3689  *  structure so we won't have to convert the fontdata all the time.
3690  *  /Jes
3691  */
3692
3693 #define max_font_size 65536
3694
3695 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3696 {
3697         struct console_font font;
3698         int rc = -EINVAL;
3699         int c;
3700
3701         if (vc->vc_mode != KD_TEXT)
3702                 return -EINVAL;
3703
3704         if (op->data) {
3705                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3706                 if (!font.data)
3707                         return -ENOMEM;
3708         } else
3709                 font.data = NULL;
3710
3711         acquire_console_sem();
3712         if (vc->vc_sw->con_font_get)
3713                 rc = vc->vc_sw->con_font_get(vc, &font);
3714         else
3715                 rc = -ENOSYS;
3716         release_console_sem();
3717
3718         if (rc)
3719                 goto out;
3720
3721         c = (font.width+7)/8 * 32 * font.charcount;
3722
3723         if (op->data && font.charcount > op->charcount)
3724                 rc = -ENOSPC;
3725         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3726                 if (font.width > op->width || font.height > op->height)
3727                         rc = -ENOSPC;
3728         } else {
3729                 if (font.width != 8)
3730                         rc = -EIO;
3731                 else if ((op->height && font.height > op->height) ||
3732                          font.height > 32)
3733                         rc = -ENOSPC;
3734         }
3735         if (rc)
3736                 goto out;
3737
3738         op->height = font.height;
3739         op->width = font.width;
3740         op->charcount = font.charcount;
3741
3742         if (op->data && copy_to_user(op->data, font.data, c))
3743                 rc = -EFAULT;
3744
3745 out:
3746         kfree(font.data);
3747         return rc;
3748 }
3749
3750 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3751 {
3752         struct console_font font;
3753         int rc = -EINVAL;
3754         int size;
3755
3756         if (vc->vc_mode != KD_TEXT)
3757                 return -EINVAL;
3758         if (!op->data)
3759                 return -EINVAL;
3760         if (op->charcount > 512)
3761                 return -EINVAL;
3762         if (!op->height) {              /* Need to guess font height [compat] */
3763                 int h, i;
3764                 u8 __user *charmap = op->data;
3765                 u8 tmp;
3766
3767                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3768                    so that we can get rid of this soon */
3769                 if (!(op->flags & KD_FONT_FLAG_OLD))
3770                         return -EINVAL;
3771                 for (h = 32; h > 0; h--)
3772                         for (i = 0; i < op->charcount; i++) {
3773                                 if (get_user(tmp, &charmap[32*i+h-1]))
3774                                         return -EFAULT;
3775                                 if (tmp)
3776                                         goto nonzero;
3777                         }
3778                 return -EINVAL;
3779         nonzero:
3780                 op->height = h;
3781         }
3782         if (op->width <= 0 || op->width > 32 || op->height > 32)
3783                 return -EINVAL;
3784         size = (op->width+7)/8 * 32 * op->charcount;
3785         if (size > max_font_size)
3786                 return -ENOSPC;
3787         font.charcount = op->charcount;
3788         font.height = op->height;
3789         font.width = op->width;
3790         font.data = kmalloc(size, GFP_KERNEL);
3791         if (!font.data)
3792                 return -ENOMEM;
3793         if (copy_from_user(font.data, op->data, size)) {
3794                 kfree(font.data);
3795                 return -EFAULT;
3796         }
3797         acquire_console_sem();
3798         if (vc->vc_sw->con_font_set)
3799                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3800         else
3801                 rc = -ENOSYS;
3802         release_console_sem();
3803         kfree(font.data);
3804         return rc;
3805 }
3806
3807 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3808 {
3809         struct console_font font = {.width = op->width, .height = op->height};
3810         char name[MAX_FONT_NAME];
3811         char *s = name;
3812         int rc;
3813
3814         if (vc->vc_mode != KD_TEXT)
3815                 return -EINVAL;
3816
3817         if (!op->data)
3818                 s = NULL;
3819         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3820                 return -EFAULT;
3821         else
3822                 name[MAX_FONT_NAME - 1] = 0;
3823
3824         acquire_console_sem();
3825         if (vc->vc_sw->con_font_default)
3826                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3827         else
3828                 rc = -ENOSYS;
3829         release_console_sem();
3830         if (!rc) {
3831                 op->width = font.width;
3832                 op->height = font.height;
3833         }
3834         return rc;
3835 }
3836
3837 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3838 {
3839         int con = op->height;
3840         int rc;
3841
3842         if (vc->vc_mode != KD_TEXT)
3843                 return -EINVAL;
3844
3845         acquire_console_sem();
3846         if (!vc->vc_sw->con_font_copy)
3847                 rc = -ENOSYS;
3848         else if (con < 0 || !vc_cons_allocated(con))
3849                 rc = -ENOTTY;
3850         else if (con == vc->vc_num)     /* nothing to do */
3851                 rc = 0;
3852         else
3853                 rc = vc->vc_sw->con_font_copy(vc, con);
3854         release_console_sem();
3855         return rc;
3856 }
3857
3858 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3859 {
3860         switch (op->op) {
3861         case KD_FONT_OP_SET:
3862                 return con_font_set(vc, op);
3863         case KD_FONT_OP_GET:
3864                 return con_font_get(vc, op);
3865         case KD_FONT_OP_SET_DEFAULT:
3866                 return con_font_default(vc, op);
3867         case KD_FONT_OP_COPY:
3868                 return con_font_copy(vc, op);
3869         }
3870         return -ENOSYS;
3871 }
3872
3873 /*
3874  *      Interface exported to selection and vcs.
3875  */
3876
3877 /* used by selection */
3878 u16 screen_glyph(struct vc_data *vc, int offset)
3879 {
3880         u16 w = scr_readw(screenpos(vc, offset, 1));
3881         u16 c = w & 0xff;
3882
3883         if (w & vc->vc_hi_font_mask)
3884                 c |= 0x100;
3885         return c;
3886 }
3887
3888 /* used by vcs - note the word offset */
3889 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3890 {
3891         return screenpos(vc, 2 * w_offset, viewed);
3892 }
3893
3894 void getconsxy(struct vc_data *vc, unsigned char *p)
3895 {
3896         p[0] = vc->vc_x;
3897         p[1] = vc->vc_y;
3898 }
3899
3900 void putconsxy(struct vc_data *vc, unsigned char *p)
3901 {
3902         hide_cursor(vc);
3903         gotoxy(vc, p[0], p[1]);
3904         set_cursor(vc);
3905 }
3906
3907 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3908 {
3909         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3910                 return softcursor_original;
3911         return scr_readw(org);
3912 }
3913
3914 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3915 {
3916         scr_writew(val, org);
3917         if ((unsigned long)org == vc->vc_pos) {
3918                 softcursor_original = -1;
3919                 add_softcursor(vc);
3920         }
3921 }
3922
3923 /*
3924  *      Visible symbols for modules
3925  */
3926
3927 EXPORT_SYMBOL(color_table);
3928 EXPORT_SYMBOL(default_red);
3929 EXPORT_SYMBOL(default_grn);
3930 EXPORT_SYMBOL(default_blu);
3931 EXPORT_SYMBOL(update_region);
3932 EXPORT_SYMBOL(redraw_screen);
3933 EXPORT_SYMBOL(vc_resize);
3934 EXPORT_SYMBOL(vc_lock_resize);
3935 EXPORT_SYMBOL(fg_console);
3936 EXPORT_SYMBOL(console_blank_hook);
3937 EXPORT_SYMBOL(console_blanked);
3938 EXPORT_SYMBOL(vc_cons);
3939 #ifndef VT_SINGLE_DRIVER
3940 EXPORT_SYMBOL(take_over_console);
3941 EXPORT_SYMBOL(give_up_console);
3942 #endif