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,
 352     u8 _underline, u8 _reverse, u8 _italic)
 353 {
 354         if (vc->vc_sw->con_build_attr)
 355                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 356                        _blink, _underline, _reverse, _italic);
 357
 358 #ifndef VT_BUF_VRAM_ONLY
 359 /*
 360  * ++roman: I completely changed the attribute format for monochrome
 361  * mode (!can_do_color). The formerly used MDA (monochrome display
 362  * adapter) format didn't allow the combination of certain effects.
 363  * Now the attribute is just a bit vector:
 364  *  Bit 0..1: intensity (0..2)
 365  *  Bit 2   : underline
 366  *  Bit 3   : reverse
 367  *  Bit 7   : blink
 368  */
 369         {
 370         u8 a = vc->vc_color;
 371         if (!vc->vc_can_do_color)
 372                 return _intensity |
 373                        (_italic ? 2 : 0) |
 374                        (_underline ? 4 : 0) |
 375                        (_reverse ? 8 : 0) |
 376                        (_blink ? 0x80 : 0);
 377         if (_italic)
 378                 a = (a & 0xF0) | vc->vc_itcolor;
 379         else if (_underline)
 380                 a = (a & 0xf0) | vc->vc_ulcolor;
 381         else if (_intensity == 0)
 382                 a = (a & 0xf0) | vc->vc_ulcolor;
 383         if (_reverse)
 384                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 385         if (_blink)
 386                 a ^= 0x80;
 387         if (_intensity == 2)
 388                 a ^= 0x08;
 389         if (vc->vc_hi_font_mask == 0x100)
 390                 a <<= 1;
 391         return a;
 392         }
 393 #else
 394         return 0;
 395 #endif
 396 }
 397
 398 static void update_attr(struct vc_data *vc)
 399 {
 400         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 401                       vc->vc_blink, vc->vc_underline,
 402                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 403         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 404 }
 405
 406 /* Note: inverting the screen twice should revert to the original state */
 407 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 408 {
 409         unsigned short *p;
 410
 411         WARN_CONSOLE_UNLOCKED();
 412
 413         count /= 2;
 414         p = screenpos(vc, offset, viewed);
 415         if (vc->vc_sw->con_invert_region)
 416                 vc->vc_sw->con_invert_region(vc, p, count);
 417 #ifndef VT_BUF_VRAM_ONLY
 418         else {
 419                 u16 *q = p;
 420                 int cnt = count;
 421                 u16 a;
 422
 423                 if (!vc->vc_can_do_color) {
 424                         while (cnt--) {
 425                             a = scr_readw(q);
 426                             a ^= 0x0800;
 427                             scr_writew(a, q);
 428                             q++;
 429                         }
 430                 } else if (vc->vc_hi_font_mask == 0x100) {
 431                         while (cnt--) {
 432                                 a = scr_readw(q);
 433                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 434                                 scr_writew(a, q);
 435                                 q++;
 436                         }
 437                 } else {
 438                         while (cnt--) {
 439                                 a = scr_readw(q);
 440                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 441                                 scr_writew(a, q);
 442                                 q++;
 443                         }
 444                 }
 445         }
 446 #endif
 447         if (DO_UPDATE(vc))
 448                 do_update_region(vc, (unsigned long) p, count);
 449 }
 450
 451 /* used by selection: complement pointer position */
 452 void complement_pos(struct vc_data *vc, int offset)
 453 {
 454         static int old_offset = -1;
 455         static unsigned short old;
 456         static unsigned short oldx, oldy;
 457
 458         WARN_CONSOLE_UNLOCKED();
 459
 460         if (old_offset != -1 && old_offset >= 0 &&
 461             old_offset < vc->vc_screenbuf_size) {
 462                 scr_writew(old, screenpos(vc, old_offset, 1));
 463                 if (DO_UPDATE(vc))
 464                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 465         }
 466
 467         old_offset = offset;
 468
 469         if (offset != -1 && offset >= 0 &&
 470             offset < vc->vc_screenbuf_size) {
 471                 unsigned short new;
 472                 unsigned short *p;
 473                 p = screenpos(vc, offset, 1);
 474                 old = scr_readw(p);
 475                 new = old ^ vc->vc_complement_mask;
 476                 scr_writew(new, p);
 477                 if (DO_UPDATE(vc)) {
 478                         oldx = (offset >> 1) % vc->vc_cols;
 479                         oldy = (offset >> 1) / vc->vc_cols;
 480                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 481                 }
 482         }
 483
 484 }
 485
 486 static void insert_char(struct vc_data *vc, unsigned int nr)
 487 {
 488         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 489
 490         p = q + vc->vc_cols - nr - vc->vc_x;
 491         while (--p >= q)
 492                 scr_writew(scr_readw(p), p + nr);
 493         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 494         vc->vc_need_wrap = 0;
 495         if (DO_UPDATE(vc)) {
 496                 unsigned short oldattr = vc->vc_attr;
 497                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 498                                      vc->vc_cols - vc->vc_x - nr);
 499                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 500                 while (nr--)
 501                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 502                 vc->vc_attr = oldattr;
 503         }
 504 }
 505
 506 static void delete_char(struct vc_data *vc, unsigned int nr)
 507 {
 508         unsigned int i = vc->vc_x;
 509         unsigned short *p = (unsigned short *)vc->vc_pos;
 510
 511         while (++i <= vc->vc_cols - nr) {
 512                 scr_writew(scr_readw(p+nr), p);
 513                 p++;
 514         }
 515         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 516         vc->vc_need_wrap = 0;
 517         if (DO_UPDATE(vc)) {
 518                 unsigned short oldattr = vc->vc_attr;
 519                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 520                                      vc->vc_cols - vc->vc_x - nr);
 521                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 522                 while (nr--)
 523                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 524                                      vc->vc_cols - 1 - nr);
 525                 vc->vc_attr = oldattr;
 526         }
 527 }
 528
 529 static int softcursor_original;
 530
 531 static void add_softcursor(struct vc_data *vc)
 532 {
 533         int i = scr_readw((u16 *) vc->vc_pos);
 534         u32 type = vc->vc_cursor_type;
 535
 536         if (! (type & 0x10)) return;
 537         if (softcursor_original != -1) return;
 538         softcursor_original = i;
 539         i |= ((type >> 8) & 0xff00 );
 540         i ^= ((type) & 0xff00 );
 541         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 542         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 543         scr_writew(i, (u16 *) vc->vc_pos);
 544         if (DO_UPDATE(vc))
 545                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 546 }
 547
 548 static void hide_softcursor(struct vc_data *vc)
 549 {
 550         if (softcursor_original != -1) {
 551                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 552                 if (DO_UPDATE(vc))
 553                         vc->vc_sw->con_putc(vc, softcursor_original,
 554                                         vc->vc_y, vc->vc_x);
 555                 softcursor_original = -1;
 556         }
 557 }
 558
 559 static void hide_cursor(struct vc_data *vc)
 560 {
 561         if (vc == sel_cons)
 562                 clear_selection();
 563         vc->vc_sw->con_cursor(vc, CM_ERASE);
 564         hide_softcursor(vc);
 565 }
 566
 567 static void set_cursor(struct vc_data *vc)
 568 {
 569         if (!IS_FG(vc) || console_blanked ||
 570             vc->vc_mode == KD_GRAPHICS)
 571                 return;
 572         if (vc->vc_deccm) {
 573                 if (vc == sel_cons)
 574                         clear_selection();
 575                 add_softcursor(vc);
 576                 if ((vc->vc_cursor_type & 0x0f) != 1)
 577                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 578         } else
 579                 hide_cursor(vc);
 580 }
 581
 582 static void set_origin(struct vc_data *vc)
 583 {
 584         WARN_CONSOLE_UNLOCKED();
 585
 586         if (!CON_IS_VISIBLE(vc) ||
 587             !vc->vc_sw->con_set_origin ||
 588             !vc->vc_sw->con_set_origin(vc))
 589                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 590         vc->vc_visible_origin = vc->vc_origin;
 591         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 592         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 593 }
 594
 595 static inline void save_screen(struct vc_data *vc)
 596 {
 597         WARN_CONSOLE_UNLOCKED();
 598
 599         if (vc->vc_sw->con_save_screen)
 600                 vc->vc_sw->con_save_screen(vc);
 601 }
 602
 603 /*
 604  *      Redrawing of screen
 605  */
 606
 607 static void clear_buffer_attributes(struct vc_data *vc)
 608 {
 609         unsigned short *p = (unsigned short *)vc->vc_origin;
 610         int count = vc->vc_screenbuf_size / 2;
 611         int mask = vc->vc_hi_font_mask | 0xff;
 612
 613         for (; count > 0; count--, p++) {
 614                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 615         }
 616 }
 617
 618 void redraw_screen(struct vc_data *vc, int is_switch)
 619 {
 620         int redraw = 0;
 621
 622         WARN_CONSOLE_UNLOCKED();
 623
 624         if (!vc) {
 625                 /* strange ... */
 626                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 627                 return;
 628         }
 629
 630         if (is_switch) {
 631                 struct vc_data *old_vc = vc_cons[fg_console].d;
 632                 if (old_vc == vc)
 633                         return;
 634                 if (!CON_IS_VISIBLE(vc))
 635                         redraw = 1;
 636                 *vc->vc_display_fg = vc;
 637                 fg_console = vc->vc_num;
 638                 hide_cursor(old_vc);
 639                 if (!CON_IS_VISIBLE(old_vc)) {
 640                         save_screen(old_vc);
 641                         set_origin(old_vc);
 642                 }
 643         } else {
 644                 hide_cursor(vc);
 645                 redraw = 1;
 646         }
 647
 648         if (redraw) {
 649                 int update;
 650                 int old_was_color = vc->vc_can_do_color;
 651
 652                 set_origin(vc);
 653                 update = vc->vc_sw->con_switch(vc);
 654                 set_palette(vc);
 655                 /*
 656                  * If console changed from mono<->color, the best we can do
 657                  * is to clear the buffer attributes. As it currently stands,
 658                  * rebuilding new attributes from the old buffer is not doable
 659                  * without overly complex code.
 660                  */
 661                 if (old_was_color != vc->vc_can_do_color) {
 662                         update_attr(vc);
 663                         clear_buffer_attributes(vc);
 664                 }
 665                 if (update && vc->vc_mode != KD_GRAPHICS)
 666                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 667         }
 668         set_cursor(vc);
 669         if (is_switch) {
 670                 set_leds();
 671                 compute_shiftstate();
 672         }
 673 }
 674
 675 /*
 676  *      Allocation, freeing and resizing of VTs.
 677  */
 678
 679 int vc_cons_allocated(unsigned int i)
 680 {
 681         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 682 }
 683
 684 static void visual_init(struct vc_data *vc, int num, int init)
 685 {
 686         /* ++Geert: vc->vc_sw->con_init determines console size */
 687         if (vc->vc_sw)
 688                 module_put(vc->vc_sw->owner);
 689         vc->vc_sw = conswitchp;
 690 #ifndef VT_SINGLE_DRIVER
 691         if (con_driver_map[num])
 692                 vc->vc_sw = con_driver_map[num];
 693 #endif
 694         __module_get(vc->vc_sw->owner);
 695         vc->vc_num = num;
 696         vc->vc_display_fg = &master_display_fg;
 697         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 698         vc->vc_uni_pagedir = 0;
 699         vc->vc_hi_font_mask = 0;
 700         vc->vc_complement_mask = 0;
 701         vc->vc_can_do_color = 0;
 702         vc->vc_sw->con_init(vc, init);
 703         if (!vc->vc_complement_mask)
 704                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 705         vc->vc_s_complement_mask = vc->vc_complement_mask;
 706         vc->vc_size_row = vc->vc_cols << 1;
 707         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 708 }
 709
 710 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 711 {
 712         WARN_CONSOLE_UNLOCKED();
 713
 714         if (currcons >= MAX_NR_CONSOLES)
 715                 return -ENXIO;
 716         if (!vc_cons[currcons].d) {
 717             struct vc_data *vc;
 718
 719             /* prevent users from taking too much memory */
 720             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 721               return -EPERM;
 722
 723             /* due to the granularity of kmalloc, we waste some memory here */
 724             /* the alloc is done in two steps, to optimize the common situation
 725                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 726             /* although the numbers above are not valid since long ago, the
 727                point is still up-to-date and the comment still has its value
 728                even if only as a historical artifact.  --mj, July 1998 */
 729             vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
 730             if (!vc)
 731                 return -ENOMEM;
 732             memset(vc, 0, sizeof(*vc));
 733             vc_cons[currcons].d = vc;
 734             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 735             visual_init(vc, currcons, 1);
 736             if (!*vc->vc_uni_pagedir_loc)
 737                 con_set_default_unimap(vc);
 738             if (!vc->vc_kmalloced)
 739                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 740             if (!vc->vc_screenbuf) {
 741                 kfree(vc);
 742                 vc_cons[currcons].d = NULL;
 743                 return -ENOMEM;
 744             }
 745             vc->vc_kmalloced = 1;
 746             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 747         }
 748         return 0;
 749 }
 750
 751 static inline int resize_screen(struct vc_data *vc, int width, int height)
 752 {
 753         /* Resizes the resolution of the display adapater */
 754         int err = 0;
 755
 756         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 757                 err = vc->vc_sw->con_resize(vc, width, height);
 758         return err;
 759 }
 760
 761 /*
 762  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 763  * [this is to be used together with some user program
 764  * like resize that changes the hardware videomode]
 765  */
 766 #define VC_RESIZE_MAXCOL (32767)
 767 #define VC_RESIZE_MAXROW (32767)
 768 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 769 {
 770         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 771         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 772         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 773         unsigned int end;
 774         unsigned short *newscreen;
 775
 776         WARN_CONSOLE_UNLOCKED();
 777
 778         if (!vc)
 779                 return -ENXIO;
 780
 781         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 782                 return -EINVAL;
 783
 784         new_cols = (cols ? cols : vc->vc_cols);
 785         new_rows = (lines ? lines : vc->vc_rows);
 786         new_row_size = new_cols << 1;
 787         new_screen_size = new_row_size * new_rows;
 788
 789         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 790                 return 0;
 791
 792         newscreen = kmalloc(new_screen_size, GFP_USER);
 793         if (!newscreen)
 794                 return -ENOMEM;
 795
 796         old_rows = vc->vc_rows;
 797         old_cols = vc->vc_cols;
 798         old_row_size = vc->vc_size_row;
 799         old_screen_size = vc->vc_screenbuf_size;
 800
 801         err = resize_screen(vc, new_cols, new_rows);
 802         if (err) {
 803                 kfree(newscreen);
 804                 return err;
 805         }
 806
 807         vc->vc_rows = new_rows;
 808         vc->vc_cols = new_cols;
 809         vc->vc_size_row = new_row_size;
 810         vc->vc_screenbuf_size = new_screen_size;
 811
 812         rlth = min(old_row_size, new_row_size);
 813         rrem = new_row_size - rlth;
 814         old_origin = vc->vc_origin;
 815         new_origin = (long) newscreen;
 816         new_scr_end = new_origin + new_screen_size;
 817
 818         if (vc->vc_y > new_rows) {
 819                 if (old_rows - vc->vc_y < new_rows) {
 820                         /*
 821                          * Cursor near the bottom, copy contents from the
 822                          * bottom of buffer
 823                          */
 824                         old_origin += (old_rows - new_rows) * old_row_size;
 825                         end = vc->vc_scr_end;
 826                 } else {
 827                         /*
 828                          * Cursor is in no man's land, copy 1/2 screenful
 829                          * from the top and bottom of cursor position
 830                          */
 831                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 832                         end = old_origin + (old_row_size * new_rows);
 833                 }
 834         } else
 835                 /*
 836                  * Cursor near the top, copy contents from the top of buffer
 837                  */
 838                 end = (old_rows > new_rows) ? old_origin +
 839                         (old_row_size * new_rows) :
 840                         vc->vc_scr_end;
 841
 842         update_attr(vc);
 843
 844         while (old_origin < end) {
 845                 scr_memcpyw((unsigned short *) new_origin,
 846                             (unsigned short *) old_origin, rlth);
 847                 if (rrem)
 848                         scr_memsetw((void *)(new_origin + rlth),
 849                                     vc->vc_video_erase_char, rrem);
 850                 old_origin += old_row_size;
 851                 new_origin += new_row_size;
 852         }
 853         if (new_scr_end > new_origin)
 854                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 855                             new_scr_end - new_origin);
 856         if (vc->vc_kmalloced)
 857                 kfree(vc->vc_screenbuf);
 858         vc->vc_screenbuf = newscreen;
 859         vc->vc_kmalloced = 1;
 860         vc->vc_screenbuf_size = new_screen_size;
 861         set_origin(vc);
 862
 863         /* do part of a reset_terminal() */
 864         vc->vc_top = 0;
 865         vc->vc_bottom = vc->vc_rows;
 866         gotoxy(vc, vc->vc_x, vc->vc_y);
 867         save_cur(vc);
 868
 869         if (vc->vc_tty) {
 870                 struct winsize ws, *cws = &vc->vc_tty->winsize;
 871
 872                 memset(&ws, 0, sizeof(ws));
 873                 ws.ws_row = vc->vc_rows;
 874                 ws.ws_col = vc->vc_cols;
 875                 ws.ws_ypixel = vc->vc_scan_lines;
 876                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
 877                     vc->vc_tty->pgrp)
 878                         kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
 879                 *cws = ws;
 880         }
 881
 882         if (CON_IS_VISIBLE(vc))
 883                 update_screen(vc);
 884         return err;
 885 }
 886
 887 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 888 {
 889         int rc;
 890
 891         acquire_console_sem();
 892         rc = vc_resize(vc, cols, lines);
 893         release_console_sem();
 894         return rc;
 895 }
 896
 897 void vc_deallocate(unsigned int currcons)
 898 {
 899         WARN_CONSOLE_UNLOCKED();
 900
 901         if (vc_cons_allocated(currcons)) {
 902                 struct vc_data *vc = vc_cons[currcons].d;
 903                 vc->vc_sw->con_deinit(vc);
 904                 put_pid(vc->vt_pid);
 905                 module_put(vc->vc_sw->owner);
 906                 if (vc->vc_kmalloced)
 907                         kfree(vc->vc_screenbuf);
 908                 if (currcons >= MIN_NR_CONSOLES)
 909                         kfree(vc);
 910                 vc_cons[currcons].d = NULL;
 911         }
 912 }
 913
 914 /*
 915  *      VT102 emulator
 916  */
 917
 918 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 919 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 920 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 921
 922 #define decarm          VC_REPEAT
 923 #define decckm          VC_CKMODE
 924 #define kbdapplic       VC_APPLIC
 925 #define lnm             VC_CRLF
 926
 927 /*
 928  * this is what the terminal answers to a ESC-Z or csi0c query.
 929  */
 930 #define VT100ID "\033[?1;2c"
 931 #define VT102ID "\033[?6c"
 932
 933 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
 934                                        8,12,10,14, 9,13,11,15 };
 935
 936 /* the default colour table, for VGA+ colour systems */
 937 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
 938     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
 939 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
 940     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
 941 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
 942     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
 943
 944 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
 945 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
 946 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
 947
 948 /*
 949  * gotoxy() must verify all boundaries, because the arguments
 950  * might also be negative. If the given position is out of
 951  * bounds, the cursor is placed at the nearest margin.
 952  */
 953 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
 954 {
 955         int min_y, max_y;
 956
 957         if (new_x < 0)
 958                 vc->vc_x = 0;
 959         else {
 960                 if (new_x >= vc->vc_cols)
 961                         vc->vc_x = vc->vc_cols - 1;
 962                 else
 963                         vc->vc_x = new_x;
 964         }
 965
 966         if (vc->vc_decom) {
 967                 min_y = vc->vc_top;
 968                 max_y = vc->vc_bottom;
 969         } else {
 970                 min_y = 0;
 971                 max_y = vc->vc_rows;
 972         }
 973         if (new_y < min_y)
 974                 vc->vc_y = min_y;
 975         else if (new_y >= max_y)
 976                 vc->vc_y = max_y - 1;
 977         else
 978                 vc->vc_y = new_y;
 979         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
 980         vc->vc_need_wrap = 0;
 981 }
 982
 983 /* for absolute user moves, when decom is set */
 984 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
 985 {
 986         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
 987 }
 988
 989 void scrollback(struct vc_data *vc, int lines)
 990 {
 991         if (!lines)
 992                 lines = vc->vc_rows / 2;
 993         scrolldelta(-lines);
 994 }
 995
 996 void scrollfront(struct vc_data *vc, int lines)
 997 {
 998         if (!lines)
 999                 lines = vc->vc_rows / 2;
1000         scrolldelta(lines);
1001 }
1002
1003 static void lf(struct vc_data *vc)
1004 {
1005         /* don't scroll if above bottom of scrolling region, or
1006          * if below scrolling region
1007          */
1008         if (vc->vc_y + 1 == vc->vc_bottom)
1009                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1010         else if (vc->vc_y < vc->vc_rows - 1) {
1011                 vc->vc_y++;
1012                 vc->vc_pos += vc->vc_size_row;
1013         }
1014         vc->vc_need_wrap = 0;
1015 }
1016
1017 static void ri(struct vc_data *vc)
1018 {
1019         /* don't scroll if below top of scrolling region, or
1020          * if above scrolling region
1021          */
1022         if (vc->vc_y == vc->vc_top)
1023                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1024         else if (vc->vc_y > 0) {
1025                 vc->vc_y--;
1026                 vc->vc_pos -= vc->vc_size_row;
1027         }
1028         vc->vc_need_wrap = 0;
1029 }
1030
1031 static inline void cr(struct vc_data *vc)
1032 {
1033         vc->vc_pos -= vc->vc_x << 1;
1034         vc->vc_need_wrap = vc->vc_x = 0;
1035 }
1036
1037 static inline void bs(struct vc_data *vc)
1038 {
1039         if (vc->vc_x) {
1040                 vc->vc_pos -= 2;
1041                 vc->vc_x--;
1042                 vc->vc_need_wrap = 0;
1043         }
1044 }
1045
1046 static inline void del(struct vc_data *vc)
1047 {
1048         /* ignored */
1049 }
1050
1051 static void csi_J(struct vc_data *vc, int vpar)
1052 {
1053         unsigned int count;
1054         unsigned short * start;
1055
1056         switch (vpar) {
1057                 case 0: /* erase from cursor to end of display */
1058                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1059                         start = (unsigned short *)vc->vc_pos;
1060                         if (DO_UPDATE(vc)) {
1061                                 /* do in two stages */
1062                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1063                                               vc->vc_cols - vc->vc_x);
1064                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1065                                               vc->vc_rows - vc->vc_y - 1,
1066                                               vc->vc_cols);
1067                         }
1068                         break;
1069                 case 1: /* erase from start to cursor */
1070                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1071                         start = (unsigned short *)vc->vc_origin;
1072                         if (DO_UPDATE(vc)) {
1073                                 /* do in two stages */
1074                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1075                                               vc->vc_cols);
1076                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1077                                               vc->vc_x + 1);
1078                         }
1079                         break;
1080                 case 2: /* erase whole display */
1081                         count = vc->vc_cols * vc->vc_rows;
1082                         start = (unsigned short *)vc->vc_origin;
1083                         if (DO_UPDATE(vc))
1084                                 vc->vc_sw->con_clear(vc, 0, 0,
1085                                               vc->vc_rows,
1086                                               vc->vc_cols);
1087                         break;
1088                 default:
1089                         return;
1090         }
1091         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1092         vc->vc_need_wrap = 0;
1093 }
1094
1095 static void csi_K(struct vc_data *vc, int vpar)
1096 {
1097         unsigned int count;
1098         unsigned short * start;
1099
1100         switch (vpar) {
1101                 case 0: /* erase from cursor to end of line */
1102                         count = vc->vc_cols - vc->vc_x;
1103                         start = (unsigned short *)vc->vc_pos;
1104                         if (DO_UPDATE(vc))
1105                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1106                                                      vc->vc_cols - vc->vc_x);
1107                         break;
1108                 case 1: /* erase from start of line to cursor */
1109                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1110                         count = vc->vc_x + 1;
1111                         if (DO_UPDATE(vc))
1112                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1113                                                      vc->vc_x + 1);
1114                         break;
1115                 case 2: /* erase whole line */
1116                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1117                         count = vc->vc_cols;
1118                         if (DO_UPDATE(vc))
1119                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1120                                               vc->vc_cols);
1121                         break;
1122                 default:
1123                         return;
1124         }
1125         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1126         vc->vc_need_wrap = 0;
1127 }
1128
1129 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1130 {                                         /* not vt100? */
1131         int count;
1132
1133         if (!vpar)
1134                 vpar++;
1135         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1136
1137         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1138         if (DO_UPDATE(vc))
1139                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1140         vc->vc_need_wrap = 0;
1141 }
1142
1143 static void default_attr(struct vc_data *vc)
1144 {
1145         vc->vc_intensity = 1;
1146         vc->vc_italic = 0;
1147         vc->vc_underline = 0;
1148         vc->vc_reverse = 0;
1149         vc->vc_blink = 0;
1150         vc->vc_color = vc->vc_def_color;
1151 }
1152
1153 /* console_sem is held */
1154 static void csi_m(struct vc_data *vc)
1155 {
1156         int i;
1157
1158         for (i = 0; i <= vc->vc_npar; i++)
1159                 switch (vc->vc_par[i]) {
1160                         case 0: /* all attributes off */
1161                                 default_attr(vc);
1162                                 break;
1163                         case 1:
1164                                 vc->vc_intensity = 2;
1165                                 break;
1166                         case 2:
1167                                 vc->vc_intensity = 0;
1168                                 break;
1169                         case 3:
1170                                 vc->vc_italic = 1;
1171                                 break;
1172                         case 4:
1173                                 vc->vc_underline = 1;
1174                                 break;
1175                         case 5:
1176                                 vc->vc_blink = 1;
1177                                 break;
1178                         case 7:
1179                                 vc->vc_reverse = 1;
1180                                 break;
1181                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1182                                   * Select primary font, don't display
1183                                   * control chars if defined, don't set
1184                                   * bit 8 on output.
1185                                   */
1186                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1187                                                 ? vc->vc_G0_charset
1188                                                 : vc->vc_G1_charset, vc);
1189                                 vc->vc_disp_ctrl = 0;
1190                                 vc->vc_toggle_meta = 0;
1191                                 break;
1192                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1193                                   * Select first alternate font, lets
1194                                   * chars < 32 be displayed as ROM chars.
1195                                   */
1196                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1197                                 vc->vc_disp_ctrl = 1;
1198                                 vc->vc_toggle_meta = 0;
1199                                 break;
1200                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1201                                   * Select second alternate font, toggle
1202                                   * high bit before displaying as ROM char.
1203                                   */
1204                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1205                                 vc->vc_disp_ctrl = 1;
1206                                 vc->vc_toggle_meta = 1;
1207                                 break;
1208                         case 21:
1209                         case 22:
1210                                 vc->vc_intensity = 1;
1211                                 break;
1212                         case 23:
1213                                 vc->vc_italic = 0;
1214                                 break;
1215                         case 24:
1216                                 vc->vc_underline = 0;
1217                                 break;
1218                         case 25:
1219                                 vc->vc_blink = 0;
1220                                 break;
1221                         case 27:
1222                                 vc->vc_reverse = 0;
1223                                 break;
1224                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1225                                   * Enables underscore, white foreground
1226                                   * with white underscore (Linux - use
1227                                   * default foreground).
1228                                   */
1229                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1230                                 vc->vc_underline = 1;
1231                                 break;
1232                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1233                                   * Disable underline option.
1234                                   * Reset colour to default? It did this
1235                                   * before...
1236                                   */
1237                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1238                                 vc->vc_underline = 0;
1239                                 break;
1240                         case 49:
1241                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1242                                 break;
1243                         default:
1244                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1245                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1246                                                 | (vc->vc_color & 0xf0);
1247                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1248                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1249                                                 | (vc->vc_color & 0x0f);
1250                                 break;
1251                 }
1252         update_attr(vc);
1253 }
1254
1255 static void respond_string(const char *p, struct tty_struct *tty)
1256 {
1257         while (*p) {
1258                 tty_insert_flip_char(tty, *p, 0);
1259                 p++;
1260         }
1261         con_schedule_flip(tty);
1262 }
1263
1264 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1265 {
1266         char buf[40];
1267
1268         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1269         respond_string(buf, tty);
1270 }
1271
1272 static inline void status_report(struct tty_struct *tty)
1273 {
1274         respond_string("\033[0n", tty); /* Terminal ok */
1275 }
1276
1277 static inline void respond_ID(struct tty_struct * tty)
1278 {
1279         respond_string(VT102ID, tty);
1280 }
1281
1282 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1283 {
1284         char buf[8];
1285
1286         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1287                 (char)('!' + mry));
1288         respond_string(buf, tty);
1289 }
1290
1291 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1292 int mouse_reporting(void)
1293 {
1294         return vc_cons[fg_console].d->vc_report_mouse;
1295 }
1296
1297 /* console_sem is held */
1298 static void set_mode(struct vc_data *vc, int on_off)
1299 {
1300         int i;
1301
1302         for (i = 0; i <= vc->vc_npar; i++)
1303                 if (vc->vc_ques) {
1304                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1305                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1306                                 if (on_off)
1307                                         set_kbd(vc, decckm);
1308                                 else
1309                                         clr_kbd(vc, decckm);
1310                                 break;
1311                         case 3: /* 80/132 mode switch unimplemented */
1312                                 vc->vc_deccolm = on_off;
1313 #if 0
1314                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1315                                 /* this alone does not suffice; some user mode
1316                                    utility has to change the hardware regs */
1317 #endif
1318                                 break;
1319                         case 5:                 /* Inverted screen on/off */
1320                                 if (vc->vc_decscnm != on_off) {
1321                                         vc->vc_decscnm = on_off;
1322                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1323                                         update_attr(vc);
1324                                 }
1325                                 break;
1326                         case 6:                 /* Origin relative/absolute */
1327                                 vc->vc_decom = on_off;
1328                                 gotoxay(vc, 0, 0);
1329                                 break;
1330                         case 7:                 /* Autowrap on/off */
1331                                 vc->vc_decawm = on_off;
1332                                 break;
1333                         case 8:                 /* Autorepeat on/off */
1334                                 if (on_off)
1335                                         set_kbd(vc, decarm);
1336                                 else
1337                                         clr_kbd(vc, decarm);
1338                                 break;
1339                         case 9:
1340                                 vc->vc_report_mouse = on_off ? 1 : 0;
1341                                 break;
1342                         case 25:                /* Cursor on/off */
1343                                 vc->vc_deccm = on_off;
1344                                 break;
1345                         case 1000:
1346                                 vc->vc_report_mouse = on_off ? 2 : 0;
1347                                 break;
1348                         }
1349                 } else {
1350                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1351                         case 3:                 /* Monitor (display ctrls) */
1352                                 vc->vc_disp_ctrl = on_off;
1353                                 break;
1354                         case 4:                 /* Insert Mode on/off */
1355                                 vc->vc_decim = on_off;
1356                                 break;
1357                         case 20:                /* Lf, Enter == CrLf/Lf */
1358                                 if (on_off)
1359                                         set_kbd(vc, lnm);
1360                                 else
1361                                         clr_kbd(vc, lnm);
1362                                 break;
1363                         }
1364                 }
1365 }
1366
1367 /* console_sem is held */
1368 static void setterm_command(struct vc_data *vc)
1369 {
1370         switch(vc->vc_par[0]) {
1371                 case 1: /* set color for underline mode */
1372                         if (vc->vc_can_do_color &&
1373                                         vc->vc_par[1] < 16) {
1374                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1375                                 if (vc->vc_underline)
1376                                         update_attr(vc);
1377                         }
1378                         break;
1379                 case 2: /* set color for half intensity mode */
1380                         if (vc->vc_can_do_color &&
1381                                         vc->vc_par[1] < 16) {
1382                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1383                                 if (vc->vc_intensity == 0)
1384                                         update_attr(vc);
1385                         }
1386                         break;
1387                 case 8: /* store colors as defaults */
1388                         vc->vc_def_color = vc->vc_attr;
1389                         if (vc->vc_hi_font_mask == 0x100)
1390                                 vc->vc_def_color >>= 1;
1391                         default_attr(vc);
1392                         update_attr(vc);
1393                         break;
1394                 case 9: /* set blanking interval */
1395                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1396                         poke_blanked_console();
1397                         break;
1398                 case 10: /* set bell frequency in Hz */
1399                         if (vc->vc_npar >= 1)
1400                                 vc->vc_bell_pitch = vc->vc_par[1];
1401                         else
1402                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1403                         break;
1404                 case 11: /* set bell duration in msec */
1405                         if (vc->vc_npar >= 1)
1406                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1407                                         vc->vc_par[1] * HZ / 1000 : 0;
1408                         else
1409                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1410                         break;
1411                 case 12: /* bring specified console to the front */
1412                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1413                                 set_console(vc->vc_par[1] - 1);
1414                         break;
1415                 case 13: /* unblank the screen */
1416                         poke_blanked_console();
1417                         break;
1418                 case 14: /* set vesa powerdown interval */
1419                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1420                         break;
1421                 case 15: /* activate the previous console */
1422                         set_console(last_console);
1423                         break;
1424         }
1425 }
1426
1427 /* console_sem is held */
1428 static void csi_at(struct vc_data *vc, unsigned int nr)
1429 {
1430         if (nr > vc->vc_cols - vc->vc_x)
1431                 nr = vc->vc_cols - vc->vc_x;
1432         else if (!nr)
1433                 nr = 1;
1434         insert_char(vc, nr);
1435 }
1436
1437 /* console_sem is held */
1438 static void csi_L(struct vc_data *vc, unsigned int nr)
1439 {
1440         if (nr > vc->vc_rows - vc->vc_y)
1441                 nr = vc->vc_rows - vc->vc_y;
1442         else if (!nr)
1443                 nr = 1;
1444         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1445         vc->vc_need_wrap = 0;
1446 }
1447
1448 /* console_sem is held */
1449 static void csi_P(struct vc_data *vc, unsigned int nr)
1450 {
1451         if (nr > vc->vc_cols - vc->vc_x)
1452                 nr = vc->vc_cols - vc->vc_x;
1453         else if (!nr)
1454                 nr = 1;
1455         delete_char(vc, nr);
1456 }
1457
1458 /* console_sem is held */
1459 static void csi_M(struct vc_data *vc, unsigned int nr)
1460 {
1461         if (nr > vc->vc_rows - vc->vc_y)
1462                 nr = vc->vc_rows - vc->vc_y;
1463         else if (!nr)
1464                 nr=1;
1465         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1466         vc->vc_need_wrap = 0;
1467 }
1468
1469 /* console_sem is held (except via vc_init->reset_terminal */
1470 static void save_cur(struct vc_data *vc)
1471 {
1472         vc->vc_saved_x          = vc->vc_x;
1473         vc->vc_saved_y          = vc->vc_y;
1474         vc->vc_s_intensity      = vc->vc_intensity;
1475         vc->vc_s_italic         = vc->vc_italic;
1476         vc->vc_s_underline      = vc->vc_underline;
1477         vc->vc_s_blink          = vc->vc_blink;
1478         vc->vc_s_reverse        = vc->vc_reverse;
1479         vc->vc_s_charset        = vc->vc_charset;
1480         vc->vc_s_color          = vc->vc_color;
1481         vc->vc_saved_G0         = vc->vc_G0_charset;
1482         vc->vc_saved_G1         = vc->vc_G1_charset;
1483 }
1484
1485 /* console_sem is held */
1486 static void restore_cur(struct vc_data *vc)
1487 {
1488         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1489         vc->vc_intensity        = vc->vc_s_intensity;
1490         vc->vc_italic           = vc->vc_s_italic;
1491         vc->vc_underline        = vc->vc_s_underline;
1492         vc->vc_blink            = vc->vc_s_blink;
1493         vc->vc_reverse          = vc->vc_s_reverse;
1494         vc->vc_charset          = vc->vc_s_charset;
1495         vc->vc_color            = vc->vc_s_color;
1496         vc->vc_G0_charset       = vc->vc_saved_G0;
1497         vc->vc_G1_charset       = vc->vc_saved_G1;
1498         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1499         update_attr(vc);
1500         vc->vc_need_wrap = 0;
1501 }
1502
1503 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1504         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1505         ESpalette };
1506
1507 /* console_sem is held (except via vc_init()) */
1508 static void reset_terminal(struct vc_data *vc, int do_clear)
1509 {
1510         vc->vc_top              = 0;
1511         vc->vc_bottom           = vc->vc_rows;
1512         vc->vc_state            = ESnormal;
1513         vc->vc_ques             = 0;
1514         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1515         vc->vc_G0_charset       = LAT1_MAP;
1516         vc->vc_G1_charset       = GRAF_MAP;
1517         vc->vc_charset          = 0;
1518         vc->vc_need_wrap        = 0;
1519         vc->vc_report_mouse     = 0;
1520         vc->vc_utf              = 0;
1521         vc->vc_utf_count        = 0;
1522
1523         vc->vc_disp_ctrl        = 0;
1524         vc->vc_toggle_meta      = 0;
1525
1526         vc->vc_decscnm          = 0;
1527         vc->vc_decom            = 0;
1528         vc->vc_decawm           = 1;
1529         vc->vc_deccm            = 1;
1530         vc->vc_decim            = 0;
1531
1532         set_kbd(vc, decarm);
1533         clr_kbd(vc, decckm);
1534         clr_kbd(vc, kbdapplic);
1535         clr_kbd(vc, lnm);
1536         kbd_table[vc->vc_num].lockstate = 0;
1537         kbd_table[vc->vc_num].slockstate = 0;
1538         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1539         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1540         /* do not do set_leds here because this causes an endless tasklet loop
1541            when the keyboard hasn't been initialized yet */
1542
1543         vc->vc_cursor_type = CUR_DEFAULT;
1544         vc->vc_complement_mask = vc->vc_s_complement_mask;
1545
1546         default_attr(vc);
1547         update_attr(vc);
1548
1549         vc->vc_tab_stop[0]      = 0x01010100;
1550         vc->vc_tab_stop[1]      =
1551         vc->vc_tab_stop[2]      =
1552         vc->vc_tab_stop[3]      =
1553         vc->vc_tab_stop[4]      = 0x01010101;
1554
1555         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1556         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1557
1558         gotoxy(vc, 0, 0);
1559         save_cur(vc);
1560         if (do_clear)
1561             csi_J(vc, 2);
1562 }
1563
1564 /* console_sem is held */
1565 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1566 {
1567         /*
1568          *  Control characters can be used in the _middle_
1569          *  of an escape sequence.
1570          */
1571         switch (c) {
1572         case 0:
1573                 return;
1574         case 7:
1575                 if (vc->vc_bell_duration)
1576                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1577                 return;
1578         case 8:
1579                 bs(vc);
1580                 return;
1581         case 9:
1582                 vc->vc_pos -= (vc->vc_x << 1);
1583                 while (vc->vc_x < vc->vc_cols - 1) {
1584                         vc->vc_x++;
1585                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1586                                 break;
1587                 }
1588                 vc->vc_pos += (vc->vc_x << 1);
1589                 return;
1590         case 10: case 11: case 12:
1591                 lf(vc);
1592                 if (!is_kbd(vc, lnm))
1593                         return;
1594         case 13:
1595                 cr(vc);
1596                 return;
1597         case 14:
1598                 vc->vc_charset = 1;
1599                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1600                 vc->vc_disp_ctrl = 1;
1601                 return;
1602         case 15:
1603                 vc->vc_charset = 0;
1604                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1605                 vc->vc_disp_ctrl = 0;
1606                 return;
1607         case 24: case 26:
1608                 vc->vc_state = ESnormal;
1609                 return;
1610         case 27:
1611                 vc->vc_state = ESesc;
1612                 return;
1613         case 127:
1614                 del(vc);
1615                 return;
1616         case 128+27:
1617                 vc->vc_state = ESsquare;
1618                 return;
1619         }
1620         switch(vc->vc_state) {
1621         case ESesc:
1622                 vc->vc_state = ESnormal;
1623                 switch (c) {
1624                 case '[':
1625                         vc->vc_state = ESsquare;
1626                         return;
1627                 case ']':
1628                         vc->vc_state = ESnonstd;
1629                         return;
1630                 case '%':
1631                         vc->vc_state = ESpercent;
1632                         return;
1633                 case 'E':
1634                         cr(vc);
1635                         lf(vc);
1636                         return;
1637                 case 'M':
1638                         ri(vc);
1639                         return;
1640                 case 'D':
1641                         lf(vc);
1642                         return;
1643                 case 'H':
1644                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1645                         return;
1646                 case 'Z':
1647                         respond_ID(tty);
1648                         return;
1649                 case '7':
1650                         save_cur(vc);
1651                         return;
1652                 case '8':
1653                         restore_cur(vc);
1654                         return;
1655                 case '(':
1656                         vc->vc_state = ESsetG0;
1657                         return;
1658                 case ')':
1659                         vc->vc_state = ESsetG1;
1660                         return;
1661                 case '#':
1662                         vc->vc_state = EShash;
1663                         return;
1664                 case 'c':
1665                         reset_terminal(vc, 1);
1666                         return;
1667                 case '>':  /* Numeric keypad */
1668                         clr_kbd(vc, kbdapplic);
1669                         return;
1670                 case '=':  /* Appl. keypad */
1671                         set_kbd(vc, kbdapplic);
1672                         return;
1673                 }
1674                 return;
1675         case ESnonstd:
1676                 if (c=='P') {   /* palette escape sequence */
1677                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1678                                 vc->vc_par[vc->vc_npar] = 0;
1679                         vc->vc_npar = 0;
1680                         vc->vc_state = ESpalette;
1681                         return;
1682                 } else if (c=='R') {   /* reset palette */
1683                         reset_palette(vc);
1684                         vc->vc_state = ESnormal;
1685                 } else
1686                         vc->vc_state = ESnormal;
1687                 return;
1688         case ESpalette:
1689                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1690                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1691                         if (vc->vc_npar == 7) {
1692                                 int i = vc->vc_par[0] * 3, j = 1;
1693                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1694                                 vc->vc_palette[i++] += vc->vc_par[j++];
1695                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1696                                 vc->vc_palette[i++] += vc->vc_par[j++];
1697                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1698                                 vc->vc_palette[i] += vc->vc_par[j];
1699                                 set_palette(vc);
1700                                 vc->vc_state = ESnormal;
1701                         }
1702                 } else
1703                         vc->vc_state = ESnormal;
1704                 return;
1705         case ESsquare:
1706                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1707                         vc->vc_par[vc->vc_npar] = 0;
1708                 vc->vc_npar = 0;
1709                 vc->vc_state = ESgetpars;
1710                 if (c == '[') { /* Function key */
1711                         vc->vc_state=ESfunckey;
1712                         return;
1713                 }
1714                 vc->vc_ques = (c == '?');
1715                 if (vc->vc_ques)
1716                         return;
1717         case ESgetpars:
1718                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1719                         vc->vc_npar++;
1720                         return;
1721                 } else if (c>='0' && c<='9') {
1722                         vc->vc_par[vc->vc_npar] *= 10;
1723                         vc->vc_par[vc->vc_npar] += c - '0';
1724                         return;
1725                 } else
1726                         vc->vc_state = ESgotpars;
1727         case ESgotpars:
1728                 vc->vc_state = ESnormal;
1729                 switch(c) {
1730                 case 'h':
1731                         set_mode(vc, 1);
1732                         return;
1733                 case 'l':
1734                         set_mode(vc, 0);
1735                         return;
1736                 case 'c':
1737                         if (vc->vc_ques) {
1738                                 if (vc->vc_par[0])
1739                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1740                                 else
1741                                         vc->vc_cursor_type = CUR_DEFAULT;
1742                                 return;
1743                         }
1744                         break;
1745                 case 'm':
1746                         if (vc->vc_ques) {
1747                                 clear_selection();
1748                                 if (vc->vc_par[0])
1749                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1750                                 else
1751                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1752                                 return;
1753                         }
1754                         break;
1755                 case 'n':
1756                         if (!vc->vc_ques) {
1757                                 if (vc->vc_par[0] == 5)
1758                                         status_report(tty);
1759                                 else if (vc->vc_par[0] == 6)
1760                                         cursor_report(vc, tty);
1761                         }
1762                         return;
1763                 }
1764                 if (vc->vc_ques) {
1765                         vc->vc_ques = 0;
1766                         return;
1767                 }
1768                 switch(c) {
1769                 case 'G': case '`':
1770                         if (vc->vc_par[0])
1771                                 vc->vc_par[0]--;
1772                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1773                         return;
1774                 case 'A':
1775                         if (!vc->vc_par[0])
1776                                 vc->vc_par[0]++;
1777                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1778                         return;
1779                 case 'B': case 'e':
1780                         if (!vc->vc_par[0])
1781                                 vc->vc_par[0]++;
1782                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1783                         return;
1784                 case 'C': case 'a':
1785                         if (!vc->vc_par[0])
1786                                 vc->vc_par[0]++;
1787                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1788                         return;
1789                 case 'D':
1790                         if (!vc->vc_par[0])
1791                                 vc->vc_par[0]++;
1792                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1793                         return;
1794                 case 'E':
1795                         if (!vc->vc_par[0])
1796                                 vc->vc_par[0]++;
1797                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1798                         return;
1799                 case 'F':
1800                         if (!vc->vc_par[0])
1801                                 vc->vc_par[0]++;
1802                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1803                         return;
1804                 case 'd':
1805                         if (vc->vc_par[0])
1806                                 vc->vc_par[0]--;
1807                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1808                         return;
1809                 case 'H': case 'f':
1810                         if (vc->vc_par[0])
1811                                 vc->vc_par[0]--;
1812                         if (vc->vc_par[1])
1813                                 vc->vc_par[1]--;
1814                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1815                         return;
1816                 case 'J':
1817                         csi_J(vc, vc->vc_par[0]);
1818                         return;
1819                 case 'K':
1820                         csi_K(vc, vc->vc_par[0]);
1821                         return;
1822                 case 'L':
1823                         csi_L(vc, vc->vc_par[0]);
1824                         return;
1825                 case 'M':
1826                         csi_M(vc, vc->vc_par[0]);
1827                         return;
1828                 case 'P':
1829                         csi_P(vc, vc->vc_par[0]);
1830                         return;
1831                 case 'c':
1832                         if (!vc->vc_par[0])
1833                                 respond_ID(tty);
1834                         return;
1835                 case 'g':
1836                         if (!vc->vc_par[0])
1837                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1838                         else if (vc->vc_par[0] == 3) {
1839                                 vc->vc_tab_stop[0] =
1840                                         vc->vc_tab_stop[1] =
1841                                         vc->vc_tab_stop[2] =
1842                                         vc->vc_tab_stop[3] =
1843                                         vc->vc_tab_stop[4] = 0;
1844                         }
1845                         return;
1846                 case 'm':
1847                         csi_m(vc);
1848                         return;
1849                 case 'q': /* DECLL - but only 3 leds */
1850                         /* map 0,1,2,3 to 0,1,2,4 */
1851                         if (vc->vc_par[0] < 4)
1852                                 setledstate(kbd_table + vc->vc_num,
1853                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1854                         return;
1855                 case 'r':
1856                         if (!vc->vc_par[0])
1857                                 vc->vc_par[0]++;
1858                         if (!vc->vc_par[1])
1859                                 vc->vc_par[1] = vc->vc_rows;
1860                         /* Minimum allowed region is 2 lines */
1861                         if (vc->vc_par[0] < vc->vc_par[1] &&
1862                             vc->vc_par[1] <= vc->vc_rows) {
1863                                 vc->vc_top = vc->vc_par[0] - 1;
1864                                 vc->vc_bottom = vc->vc_par[1];
1865                                 gotoxay(vc, 0, 0);
1866                         }
1867                         return;
1868                 case 's':
1869                         save_cur(vc);
1870                         return;
1871                 case 'u':
1872                         restore_cur(vc);
1873                         return;
1874                 case 'X':
1875                         csi_X(vc, vc->vc_par[0]);
1876                         return;
1877                 case '@':
1878                         csi_at(vc, vc->vc_par[0]);
1879                         return;
1880                 case ']': /* setterm functions */
1881                         setterm_command(vc);
1882                         return;
1883                 }
1884                 return;
1885         case ESpercent:
1886                 vc->vc_state = ESnormal;
1887                 switch (c) {
1888                 case '@':  /* defined in ISO 2022 */
1889                         vc->vc_utf = 0;
1890                         return;
1891                 case 'G':  /* prelim official escape code */
1892                 case '8':  /* retained for compatibility */
1893                         vc->vc_utf = 1;
1894                         return;
1895                 }
1896                 return;
1897         case ESfunckey:
1898                 vc->vc_state = ESnormal;
1899                 return;
1900         case EShash:
1901                 vc->vc_state = ESnormal;
1902                 if (c == '8') {
1903                         /* DEC screen alignment test. kludge :-) */
1904                         vc->vc_video_erase_char =
1905                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1906                         csi_J(vc, 2);
1907                         vc->vc_video_erase_char =
1908                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1909                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1910                 }
1911                 return;
1912         case ESsetG0:
1913                 if (c == '0')
1914                         vc->vc_G0_charset = GRAF_MAP;
1915                 else if (c == 'B')
1916                         vc->vc_G0_charset = LAT1_MAP;
1917                 else if (c == 'U')
1918                         vc->vc_G0_charset = IBMPC_MAP;
1919                 else if (c == 'K')
1920                         vc->vc_G0_charset = USER_MAP;
1921                 if (vc->vc_charset == 0)
1922                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1923                 vc->vc_state = ESnormal;
1924                 return;
1925         case ESsetG1:
1926                 if (c == '0')
1927                         vc->vc_G1_charset = GRAF_MAP;
1928                 else if (c == 'B')
1929                         vc->vc_G1_charset = LAT1_MAP;
1930                 else if (c == 'U')
1931                         vc->vc_G1_charset = IBMPC_MAP;
1932                 else if (c == 'K')
1933                         vc->vc_G1_charset = USER_MAP;
1934                 if (vc->vc_charset == 1)
1935                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1936                 vc->vc_state = ESnormal;
1937                 return;
1938         default:
1939                 vc->vc_state = ESnormal;
1940         }
1941 }
1942
1943 /* This is a temporary buffer used to prepare a tty console write
1944  * so that we can easily avoid touching user space while holding the
1945  * console spinlock.  It is allocated in con_init and is shared by
1946  * this code and the vc_screen read/write tty calls.
1947  *
1948  * We have to allocate this statically in the kernel data section
1949  * since console_init (and thus con_init) are called before any
1950  * kernel memory allocation is available.
1951  */
1952 char con_buf[CON_BUF_SIZE];
1953 DECLARE_MUTEX(con_buf_sem);
1954
1955 /* is_double_width() is based on the wcwidth() implementation by
1956  * Markus Kuhn -- 2003-05-20 (Unicode 4.0)
1957  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
1958  */
1959 struct interval {
1960         uint32_t first;
1961         uint32_t last;
1962 };
1963
1964 static int bisearch(uint32_t ucs, const struct interval *table, int max)
1965 {
1966         int min = 0;
1967         int mid;
1968
1969         if (ucs < table[0].first || ucs > table[max].last)
1970                 return 0;
1971         while (max >= min) {
1972                 mid = (min + max) / 2;
1973                 if (ucs > table[mid].last)
1974                         min = mid + 1;
1975                 else if (ucs < table[mid].first)
1976                         max = mid - 1;
1977                 else
1978                         return 1;
1979         }
1980         return 0;
1981 }
1982
1983 static int is_double_width(uint32_t ucs)
1984 {
1985         static const struct interval double_width[] = {
1986                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
1987                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1988                 { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 }, { 0xFFE0, 0xFFE6 },
1989                 { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
1990         };
1991         return bisearch(ucs, double_width,
1992                 sizeof(double_width) / sizeof(*double_width) - 1);
1993 }
1994
1995 /* acquires console_sem */
1996 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1997 {
1998 #ifdef VT_BUF_VRAM_ONLY
1999 #define FLUSH do { } while(0);
2000 #else
2001 #define FLUSH if (draw_x >= 0) { \
2002         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2003         draw_x = -1; \
2004         }
2005 #endif
2006
2007         int c, tc, ok, n = 0, draw_x = -1;
2008         unsigned int currcons;
2009         unsigned long draw_from = 0, draw_to = 0;
2010         struct vc_data *vc;
2011         unsigned char vc_attr;
2012         uint8_t rescan;
2013         uint8_t inverse;
2014         uint8_t width;
2015         u16 himask, charmask;
2016         const unsigned char *orig_buf = NULL;
2017         int orig_count;
2018
2019         if (in_interrupt())
2020                 return count;
2021
2022         might_sleep();
2023
2024         acquire_console_sem();
2025         vc = tty->driver_data;
2026         if (vc == NULL) {
2027                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2028                 release_console_sem();
2029                 return 0;
2030         }
2031
2032         currcons = vc->vc_num;
2033         if (!vc_cons_allocated(currcons)) {
2034             /* could this happen? */
2035             static int error = 0;
2036             if (!error) {
2037                 error = 1;
2038                 printk("con_write: tty %d not allocated\n", currcons+1);
2039             }
2040             release_console_sem();
2041             return 0;
2042         }
2043         release_console_sem();
2044
2045         orig_buf = buf;
2046         orig_count = count;
2047
2048         /* At this point 'buf' is guaranteed to be a kernel buffer
2049          * and therefore no access to userspace (and therefore sleeping)
2050          * will be needed.  The con_buf_sem serializes all tty based
2051          * console rendering and vcs write/read operations.  We hold
2052          * the console spinlock during the entire write.
2053          */
2054
2055         acquire_console_sem();
2056
2057         vc = tty->driver_data;
2058         if (vc == NULL) {
2059                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2060                 release_console_sem();
2061                 goto out;
2062         }
2063
2064         himask = vc->vc_hi_font_mask;
2065         charmask = himask ? 0x1ff : 0xff;
2066
2067         /* undraw cursor first */
2068         if (IS_FG(vc))
2069                 hide_cursor(vc);
2070
2071         while (!tty->stopped && count) {
2072                 int orig = *buf;
2073                 c = orig;
2074                 buf++;
2075                 n++;
2076                 count--;
2077                 rescan = 0;
2078                 inverse = 0;
2079                 width = 1;
2080
2081                 /* Do no translation at all in control states */
2082                 if (vc->vc_state != ESnormal) {
2083                         tc = c;
2084                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2085                     /* Combine UTF-8 into Unicode in vc_utf_char.
2086                      * vc_utf_count is the number of continuation bytes still
2087                      * expected to arrive.
2088                      * vc_npar is the number of continuation bytes arrived so
2089                      * far
2090                      */
2091 rescan_last_byte:
2092                     if ((c & 0xc0) == 0x80) {
2093                         /* Continuation byte received */
2094                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2095                         if (vc->vc_utf_count) {
2096                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2097                             vc->vc_npar++;
2098                             if (--vc->vc_utf_count) {
2099                                 /* Still need some bytes */
2100                                 continue;
2101                             }
2102                             /* Got a whole character */
2103                             c = vc->vc_utf_char;
2104                             /* Reject overlong sequences */
2105                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2106                                         c > utf8_length_changes[vc->vc_npar])
2107                                 c = 0xfffd;
2108                         } else {
2109                             /* Unexpected continuation byte */
2110                             vc->vc_utf_count = 0;
2111                             c = 0xfffd;
2112                         }
2113                     } else {
2114                         /* Single ASCII byte or first byte of a sequence received */
2115                         if (vc->vc_utf_count) {
2116                             /* Continuation byte expected */
2117                             rescan = 1;
2118                             vc->vc_utf_count = 0;
2119                             c = 0xfffd;
2120                         } else if (c > 0x7f) {
2121                             /* First byte of a multibyte sequence received */
2122                             vc->vc_npar = 0;
2123                             if ((c & 0xe0) == 0xc0) {
2124                                 vc->vc_utf_count = 1;
2125                                 vc->vc_utf_char = (c & 0x1f);
2126                             } else if ((c & 0xf0) == 0xe0) {
2127                                 vc->vc_utf_count = 2;
2128                                 vc->vc_utf_char = (c & 0x0f);
2129                             } else if ((c & 0xf8) == 0xf0) {
2130                                 vc->vc_utf_count = 3;
2131                                 vc->vc_utf_char = (c & 0x07);
2132                             } else if ((c & 0xfc) == 0xf8) {
2133                                 vc->vc_utf_count = 4;
2134                                 vc->vc_utf_char = (c & 0x03);
2135                             } else if ((c & 0xfe) == 0xfc) {
2136                                 vc->vc_utf_count = 5;
2137                                 vc->vc_utf_char = (c & 0x01);
2138                             } else {
2139                                 /* 254 and 255 are invalid */
2140                                 c = 0xfffd;
2141                             }
2142                             if (vc->vc_utf_count) {
2143                                 /* Still need some bytes */
2144                                 continue;
2145                             }
2146                         }
2147                         /* Nothing to do if an ASCII byte was received */
2148                     }
2149                     /* End of UTF-8 decoding. */
2150                     /* c is the received character, or U+FFFD for invalid sequences. */
2151                     /* Replace invalid Unicode code points with U+FFFD too */
2152                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2153                         c = 0xfffd;
2154                     tc = c;
2155                 } else {        /* no utf or alternate charset mode */
2156                     tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2157                 }
2158
2159                 /* If the original code was a control character we
2160                  * only allow a glyph to be displayed if the code is
2161                  * not normally used (such as for cursor movement) or
2162                  * if the disp_ctrl mode has been explicitly enabled.
2163                  * Certain characters (as given by the CTRL_ALWAYS
2164                  * bitmap) are always displayed as control characters,
2165                  * as the console would be pretty useless without
2166                  * them; to display an arbitrary font position use the
2167                  * direct-to-font zone in UTF-8 mode.
2168                  */
2169                 ok = tc && (c >= 32 ||
2170                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2171                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2172                         && (c != 127 || vc->vc_disp_ctrl)
2173                         && (c != 128+27);
2174
2175                 if (vc->vc_state == ESnormal && ok) {
2176                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2177                                 if (is_double_width(c))
2178                                         width = 2;
2179                         }
2180                         /* Now try to find out how to display it */
2181                         tc = conv_uni_to_pc(vc, tc);
2182                         if (tc & ~charmask) {
2183                                 if (tc == -1 || tc == -2) {
2184                                     continue; /* nothing to display */
2185                                 }
2186                                 /* Glyph not found */
2187                                 if (!(vc->vc_utf && !vc->vc_disp_ctrl) && !(c & ~charmask)) {
2188                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2189                                        This would make absolutely no sense with Unicode in mind. */
2190                                     tc = c;
2191                                 } else {
2192                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2193                                     tc = conv_uni_to_pc(vc, 0xfffd);
2194                                     if (tc < 0) {
2195                                         inverse = 1;
2196                                         tc = conv_uni_to_pc(vc, '?');
2197                                         if (tc < 0) tc = '?';
2198                                     }
2199                                 }
2200                         }
2201
2202                         if (!inverse) {
2203                                 vc_attr = vc->vc_attr;
2204                         } else {
2205                                 /* invert vc_attr */
2206                                 if (!vc->vc_can_do_color) {
2207                                         vc_attr = (vc->vc_attr) ^ 0x08;
2208                                 } else if (vc->vc_hi_font_mask == 0x100) {
2209                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2210                                 } else {
2211                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2212                                 }
2213                         }
2214
2215                         while (1) {
2216                                 if (vc->vc_need_wrap || vc->vc_decim)
2217                                         FLUSH
2218                                 if (vc->vc_need_wrap) {
2219                                         cr(vc);
2220                                         lf(vc);
2221                                 }
2222                                 if (vc->vc_decim)
2223                                         insert_char(vc, 1);
2224                                 scr_writew(himask ?
2225                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2226                                              (vc_attr << 8) + tc,
2227                                            (u16 *) vc->vc_pos);
2228                                 if (DO_UPDATE(vc) && draw_x < 0) {
2229                                         draw_x = vc->vc_x;
2230                                         draw_from = vc->vc_pos;
2231                                 }
2232                                 if (vc->vc_x == vc->vc_cols - 1) {
2233                                         vc->vc_need_wrap = vc->vc_decawm;
2234                                         draw_to = vc->vc_pos + 2;
2235                                 } else {
2236                                         vc->vc_x++;
2237                                         draw_to = (vc->vc_pos += 2);
2238                                 }
2239
2240                                 if (!--width) break;
2241
2242                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2243                                 if (tc < 0) tc = ' ';
2244                         }
2245
2246                         if (rescan) {
2247                                 rescan = 0;
2248                                 inverse = 0;
2249                                 width = 1;
2250                                 c = orig;
2251                                 goto rescan_last_byte;
2252                         }
2253                         continue;
2254                 }
2255                 FLUSH
2256                 do_con_trol(tty, vc, orig);
2257         }
2258         FLUSH
2259         console_conditional_schedule();
2260         release_console_sem();
2261
2262 out:
2263         return n;
2264 #undef FLUSH
2265 }
2266
2267 /*
2268  * This is the console switching callback.
2269  *
2270  * Doing console switching in a process context allows
2271  * us to do the switches asynchronously (needed when we want
2272  * to switch due to a keyboard interrupt).  Synchronization
2273  * with other console code and prevention of re-entrancy is
2274  * ensured with console_sem.
2275  */
2276 static void console_callback(struct work_struct *ignored)
2277 {
2278         acquire_console_sem();
2279
2280         if (want_console >= 0) {
2281                 if (want_console != fg_console &&
2282                     vc_cons_allocated(want_console)) {
2283                         hide_cursor(vc_cons[fg_console].d);
2284                         change_console(vc_cons[want_console].d);
2285                         /* we only changed when the console had already
2286                            been allocated - a new console is not created
2287                            in an interrupt routine */
2288                 }
2289                 want_console = -1;
2290         }
2291         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2292                 do_poke_blanked_console = 0;
2293                 poke_blanked_console();
2294         }
2295         if (scrollback_delta) {
2296                 struct vc_data *vc = vc_cons[fg_console].d;
2297                 clear_selection();
2298                 if (vc->vc_mode == KD_TEXT)
2299                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2300                 scrollback_delta = 0;
2301         }
2302         if (blank_timer_expired) {
2303                 do_blank_screen(0);
2304                 blank_timer_expired = 0;
2305         }
2306
2307         release_console_sem();
2308 }
2309
2310 int set_console(int nr)
2311 {
2312         struct vc_data *vc = vc_cons[fg_console].d;
2313
2314         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2315                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2316
2317                 /*
2318                  * Console switch will fail in console_callback() or
2319                  * change_console() so there is no point scheduling
2320                  * the callback
2321                  *
2322                  * Existing set_console() users don't check the return
2323                  * value so this shouldn't break anything
2324                  */
2325                 return -EINVAL;
2326         }
2327
2328         want_console = nr;
2329         schedule_console_callback();
2330
2331         return 0;
2332 }
2333
2334 struct tty_driver *console_driver;
2335
2336 #ifdef CONFIG_VT_CONSOLE
2337
2338 /*
2339  *      Console on virtual terminal
2340  *
2341  * The console must be locked when we get here.
2342  */
2343
2344 static void vt_console_print(struct console *co, const char *b, unsigned count)
2345 {
2346         struct vc_data *vc = vc_cons[fg_console].d;
2347         unsigned char c;
2348         static unsigned long printing;
2349         const ushort *start;
2350         ushort cnt = 0;
2351         ushort myx;
2352
2353         /* console busy or not yet initialized */
2354         if (!printable || test_and_set_bit(0, &printing))
2355                 return;
2356
2357         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2358                 vc = vc_cons[kmsg_redirect - 1].d;
2359
2360         /* read `x' only after setting currcons properly (otherwise
2361            the `x' macro will read the x of the foreground console). */
2362         myx = vc->vc_x;
2363
2364         if (!vc_cons_allocated(fg_console)) {
2365                 /* impossible */
2366                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2367                 goto quit;
2368         }
2369
2370         if (vc->vc_mode != KD_TEXT)
2371                 goto quit;
2372
2373         /* undraw cursor first */
2374         if (IS_FG(vc))
2375                 hide_cursor(vc);
2376
2377         start = (ushort *)vc->vc_pos;
2378
2379         /* Contrived structure to try to emulate original need_wrap behaviour
2380          * Problems caused when we have need_wrap set on '\n' character */
2381         while (count--) {
2382                 c = *b++;
2383                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2384                         if (cnt > 0) {
2385                                 if (CON_IS_VISIBLE(vc))
2386                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2387                                 vc->vc_x += cnt;
2388                                 if (vc->vc_need_wrap)
2389                                         vc->vc_x--;
2390                                 cnt = 0;
2391                         }
2392                         if (c == 8) {           /* backspace */
2393                                 bs(vc);
2394                                 start = (ushort *)vc->vc_pos;
2395                                 myx = vc->vc_x;
2396                                 continue;
2397                         }
2398                         if (c != 13)
2399                                 lf(vc);
2400                         cr(vc);
2401                         start = (ushort *)vc->vc_pos;
2402                         myx = vc->vc_x;
2403                         if (c == 10 || c == 13)
2404                                 continue;
2405                 }
2406                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2407                 cnt++;
2408                 if (myx == vc->vc_cols - 1) {
2409                         vc->vc_need_wrap = 1;
2410                         continue;
2411                 }
2412                 vc->vc_pos += 2;
2413                 myx++;
2414         }
2415         if (cnt > 0) {
2416                 if (CON_IS_VISIBLE(vc))
2417                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2418                 vc->vc_x += cnt;
2419                 if (vc->vc_x == vc->vc_cols) {
2420                         vc->vc_x--;
2421                         vc->vc_need_wrap = 1;
2422                 }
2423         }
2424         set_cursor(vc);
2425
2426 quit:
2427         clear_bit(0, &printing);
2428 }
2429
2430 static struct tty_driver *vt_console_device(struct console *c, int *index)
2431 {
2432         *index = c->index ? c->index-1 : fg_console;
2433         return console_driver;
2434 }
2435
2436 static struct console vt_console_driver = {
2437         .name           = "tty",
2438         .write          = vt_console_print,
2439         .device         = vt_console_device,
2440         .unblank        = unblank_screen,
2441         .flags          = CON_PRINTBUFFER,
2442         .index          = -1,
2443 };
2444 #endif
2445
2446 /*
2447  *      Handling of Linux-specific VC ioctls
2448  */
2449
2450 /*
2451  * Generally a bit racy with respect to console_sem().
2452  *
2453  * There are some functions which don't need it.
2454  *
2455  * There are some functions which can sleep for arbitrary periods
2456  * (paste_selection) but we don't need the lock there anyway.
2457  *
2458  * set_selection has locking, and definitely needs it
2459  */
2460
2461 int tioclinux(struct tty_struct *tty, unsigned long arg)
2462 {
2463         char type, data;
2464         char __user *p = (char __user *)arg;
2465         int lines;
2466         int ret;
2467
2468         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2469                 return -EINVAL;
2470         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2471                 return -EPERM;
2472         if (get_user(type, p))
2473                 return -EFAULT;
2474         ret = 0;
2475         switch (type)
2476         {
2477                 case TIOCL_SETSEL:
2478                         acquire_console_sem();
2479                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2480                         release_console_sem();
2481                         break;
2482                 case TIOCL_PASTESEL:
2483                         ret = paste_selection(tty);
2484                         break;
2485                 case TIOCL_UNBLANKSCREEN:
2486                         acquire_console_sem();
2487                         unblank_screen();
2488                         release_console_sem();
2489                         break;
2490                 case TIOCL_SELLOADLUT:
2491                         ret = sel_loadlut(p);
2492                         break;
2493                 case TIOCL_GETSHIFTSTATE:
2494
2495         /*
2496          * Make it possible to react to Shift+Mousebutton.
2497          * Note that 'shift_state' is an undocumented
2498          * kernel-internal variable; programs not closely
2499          * related to the kernel should not use this.
2500          */
2501                         data = shift_state;
2502                         ret = __put_user(data, p);
2503                         break;
2504                 case TIOCL_GETMOUSEREPORTING:
2505                         data = mouse_reporting();
2506                         ret = __put_user(data, p);
2507                         break;
2508                 case TIOCL_SETVESABLANK:
2509                         ret = set_vesa_blanking(p);
2510                         break;
2511                 case TIOCL_GETKMSGREDIRECT:
2512                         data = kmsg_redirect;
2513                         ret = __put_user(data, p);
2514                         break;
2515                 case TIOCL_SETKMSGREDIRECT:
2516                         if (!capable(CAP_SYS_ADMIN)) {
2517                                 ret = -EPERM;
2518                         } else {
2519                                 if (get_user(data, p+1))
2520                                         ret = -EFAULT;
2521                                 else
2522                                         kmsg_redirect = data;
2523                         }
2524                         break;
2525                 case TIOCL_GETFGCONSOLE:
2526                         ret = fg_console;
2527                         break;
2528                 case TIOCL_SCROLLCONSOLE:
2529                         if (get_user(lines, (s32 __user *)(p+4))) {
2530                                 ret = -EFAULT;
2531                         } else {
2532                                 scrollfront(vc_cons[fg_console].d, lines);
2533                                 ret = 0;
2534                         }
2535                         break;
2536                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2537                         acquire_console_sem();
2538                         ignore_poke = 1;
2539                         do_blank_screen(0);
2540                         release_console_sem();
2541                         break;
2542                 case TIOCL_BLANKEDSCREEN:
2543                         ret = console_blanked;
2544                         break;
2545                 default:
2546                         ret = -EINVAL;
2547                         break;
2548         }
2549         return ret;
2550 }
2551
2552 /*
2553  * /dev/ttyN handling
2554  */
2555
2556 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2557 {
2558         int     retval;
2559
2560         retval = do_con_write(tty, buf, count);
2561         con_flush_chars(tty);
2562
2563         return retval;
2564 }
2565
2566 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2567 {
2568         if (in_interrupt())
2569                 return; /* n_r3964 calls put_char() from interrupt context */
2570         do_con_write(tty, &ch, 1);
2571 }
2572
2573 static int con_write_room(struct tty_struct *tty)
2574 {
2575         if (tty->stopped)
2576                 return 0;
2577         return 4096;            /* No limit, really; we're not buffering */
2578 }
2579
2580 static int con_chars_in_buffer(struct tty_struct *tty)
2581 {
2582         return 0;               /* we're not buffering */
2583 }
2584
2585 /*
2586  * con_throttle and con_unthrottle are only used for
2587  * paste_selection(), which has to stuff in a large number of
2588  * characters...
2589  */
2590 static void con_throttle(struct tty_struct *tty)
2591 {
2592 }
2593
2594 static void con_unthrottle(struct tty_struct *tty)
2595 {
2596         struct vc_data *vc = tty->driver_data;
2597
2598         wake_up_interruptible(&vc->paste_wait);
2599 }
2600
2601 /*
2602  * Turn the Scroll-Lock LED on when the tty is stopped
2603  */
2604 static void con_stop(struct tty_struct *tty)
2605 {
2606         int console_num;
2607         if (!tty)
2608                 return;
2609         console_num = tty->index;
2610         if (!vc_cons_allocated(console_num))
2611                 return;
2612         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2613         set_leds();
2614 }
2615
2616 /*
2617  * Turn the Scroll-Lock LED off when the console is started
2618  */
2619 static void con_start(struct tty_struct *tty)
2620 {
2621         int console_num;
2622         if (!tty)
2623                 return;
2624         console_num = tty->index;
2625         if (!vc_cons_allocated(console_num))
2626                 return;
2627         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2628         set_leds();
2629 }
2630
2631 static void con_flush_chars(struct tty_struct *tty)
2632 {
2633         struct vc_data *vc;
2634
2635         if (in_interrupt())     /* from flush_to_ldisc */
2636                 return;
2637
2638         /* if we race with con_close(), vt may be null */
2639         acquire_console_sem();
2640         vc = tty->driver_data;
2641         if (vc)
2642                 set_cursor(vc);
2643         release_console_sem();
2644 }
2645
2646 /*
2647  * Allocate the console screen memory.
2648  */
2649 static int con_open(struct tty_struct *tty, struct file *filp)
2650 {
2651         unsigned int currcons = tty->index;
2652         int ret = 0;
2653
2654         acquire_console_sem();
2655         if (tty->driver_data == NULL) {
2656                 ret = vc_allocate(currcons);
2657                 if (ret == 0) {
2658                         struct vc_data *vc = vc_cons[currcons].d;
2659                         tty->driver_data = vc;
2660                         vc->vc_tty = tty;
2661
2662                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2663                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2664                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2665                         }
2666                         release_console_sem();
2667                         vcs_make_sysfs(tty);
2668                         return ret;
2669                 }
2670         }
2671         release_console_sem();
2672         return ret;
2673 }
2674
2675 /*
2676  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2677  * and taking a ref against the tty while we're in the process of forgetting
2678  * about it and cleaning things up.
2679  *
2680  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2681  */
2682 static void con_close(struct tty_struct *tty, struct file *filp)
2683 {
2684         mutex_lock(&tty_mutex);
2685         acquire_console_sem();
2686         if (tty && tty->count == 1) {
2687                 struct vc_data *vc = tty->driver_data;
2688
2689                 if (vc)
2690                         vc->vc_tty = NULL;
2691                 tty->driver_data = NULL;
2692                 release_console_sem();
2693                 vcs_remove_sysfs(tty);
2694                 mutex_unlock(&tty_mutex);
2695                 /*
2696                  * tty_mutex is released, but we still hold BKL, so there is
2697                  * still exclusion against init_dev()
2698                  */
2699                 return;
2700         }
2701         release_console_sem();
2702         mutex_unlock(&tty_mutex);
2703 }
2704
2705 static int default_italic_color    = 2; // green (ASCII)
2706 static int default_underline_color = 3; // cyan (ASCII)
2707 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2708 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2709
2710 static void vc_init(struct vc_data *vc, unsigned int rows,
2711                     unsigned int cols, int do_clear)
2712 {
2713         int j, k ;
2714
2715         vc->vc_cols = cols;
2716         vc->vc_rows = rows;
2717         vc->vc_size_row = cols << 1;
2718         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2719
2720         set_origin(vc);
2721         vc->vc_pos = vc->vc_origin;
2722         reset_vc(vc);
2723         for (j=k=0; j<16; j++) {
2724                 vc->vc_palette[k++] = default_red[j] ;
2725                 vc->vc_palette[k++] = default_grn[j] ;
2726                 vc->vc_palette[k++] = default_blu[j] ;
2727         }
2728         vc->vc_def_color       = 0x07;   /* white */
2729         vc->vc_ulcolor         = default_underline_color;
2730         vc->vc_itcolor         = default_italic_color;
2731         vc->vc_halfcolor       = 0x08;   /* grey */
2732         init_waitqueue_head(&vc->paste_wait);
2733         reset_terminal(vc, do_clear);
2734 }
2735
2736 /*
2737  * This routine initializes console interrupts, and does nothing
2738  * else. If you want the screen to clear, call tty_write with
2739  * the appropriate escape-sequence.
2740  */
2741
2742 static int __init con_init(void)
2743 {
2744         const char *display_desc = NULL;
2745         struct vc_data *vc;
2746         unsigned int currcons = 0, i;
2747
2748         acquire_console_sem();
2749
2750         if (conswitchp)
2751                 display_desc = conswitchp->con_startup();
2752         if (!display_desc) {
2753                 fg_console = 0;
2754                 release_console_sem();
2755                 return 0;
2756         }
2757
2758         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2759                 struct con_driver *con_driver = &registered_con_driver[i];
2760
2761                 if (con_driver->con == NULL) {
2762                         con_driver->con = conswitchp;
2763                         con_driver->desc = display_desc;
2764                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2765                         con_driver->first = 0;
2766                         con_driver->last = MAX_NR_CONSOLES - 1;
2767                         break;
2768                 }
2769         }
2770
2771         for (i = 0; i < MAX_NR_CONSOLES; i++)
2772                 con_driver_map[i] = conswitchp;
2773
2774         if (blankinterval) {
2775                 blank_state = blank_normal_wait;
2776                 mod_timer(&console_timer, jiffies + blankinterval);
2777         }
2778
2779         /*
2780          * kmalloc is not running yet - we use the bootmem allocator.
2781          */
2782         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2783                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2784                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2785                 visual_init(vc, currcons, 1);
2786                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2787                 vc->vc_kmalloced = 0;
2788                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2789                         currcons || !vc->vc_sw->con_save_screen);
2790         }
2791         currcons = fg_console = 0;
2792         master_display_fg = vc = vc_cons[currcons].d;
2793         set_origin(vc);
2794         save_screen(vc);
2795         gotoxy(vc, vc->vc_x, vc->vc_y);
2796         csi_J(vc, 0);
2797         update_screen(vc);
2798         printk("Console: %s %s %dx%d",
2799                 vc->vc_can_do_color ? "colour" : "mono",
2800                 display_desc, vc->vc_cols, vc->vc_rows);
2801         printable = 1;
2802         printk("\n");
2803
2804         release_console_sem();
2805
2806 #ifdef CONFIG_VT_CONSOLE
2807         register_console(&vt_console_driver);
2808 #endif
2809         return 0;
2810 }
2811 console_initcall(con_init);
2812
2813 static const struct tty_operations con_ops = {
2814         .open = con_open,
2815         .close = con_close,
2816         .write = con_write,
2817         .write_room = con_write_room,
2818         .put_char = con_put_char,
2819         .flush_chars = con_flush_chars,
2820         .chars_in_buffer = con_chars_in_buffer,
2821         .ioctl = vt_ioctl,
2822         .stop = con_stop,
2823         .start = con_start,
2824         .throttle = con_throttle,
2825         .unthrottle = con_unthrottle,
2826 };
2827
2828 int __init vty_init(void)
2829 {
2830         vcs_init();
2831
2832         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2833         if (!console_driver)
2834                 panic("Couldn't allocate console driver\n");
2835         console_driver->owner = THIS_MODULE;
2836         console_driver->name = "tty";
2837         console_driver->name_base = 1;
2838         console_driver->major = TTY_MAJOR;
2839         console_driver->minor_start = 1;
2840         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2841         console_driver->init_termios = tty_std_termios;
2842         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2843         tty_set_operations(console_driver, &con_ops);
2844         if (tty_register_driver(console_driver))
2845                 panic("Couldn't register console driver\n");
2846
2847         kbd_init();
2848         console_map_init();
2849 #ifdef CONFIG_PROM_CONSOLE
2850         prom_con_init();
2851 #endif
2852 #ifdef CONFIG_MDA_CONSOLE
2853         mda_console_init();
2854 #endif
2855         return 0;
2856 }
2857
2858 #ifndef VT_SINGLE_DRIVER
2859 #include <linux/device.h>
2860
2861 static struct class *vtconsole_class;
2862
2863 static int bind_con_driver(const struct consw *csw, int first, int last,
2864                            int deflt)
2865 {
2866         struct module *owner = csw->owner;
2867         const char *desc = NULL;
2868         struct con_driver *con_driver;
2869         int i, j = -1, k = -1, retval = -ENODEV;
2870
2871         if (!try_module_get(owner))
2872                 return -ENODEV;
2873
2874         acquire_console_sem();
2875
2876         /* check if driver is registered */
2877         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2878                 con_driver = &registered_con_driver[i];
2879
2880                 if (con_driver->con == csw) {
2881                         desc = con_driver->desc;
2882                         retval = 0;
2883                         break;
2884                 }
2885         }
2886
2887         if (retval)
2888                 goto err;
2889
2890         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2891                 csw->con_startup();
2892                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2893         }
2894
2895         if (deflt) {
2896                 if (conswitchp)
2897                         module_put(conswitchp->owner);
2898
2899                 __module_get(owner);
2900                 conswitchp = csw;
2901         }
2902
2903         first = max(first, con_driver->first);
2904         last = min(last, con_driver->last);
2905
2906         for (i = first; i <= last; i++) {
2907                 int old_was_color;
2908                 struct vc_data *vc = vc_cons[i].d;
2909
2910                 if (con_driver_map[i])
2911                         module_put(con_driver_map[i]->owner);
2912                 __module_get(owner);
2913                 con_driver_map[i] = csw;
2914
2915                 if (!vc || !vc->vc_sw)
2916                         continue;
2917
2918                 j = i;
2919
2920                 if (CON_IS_VISIBLE(vc)) {
2921                         k = i;
2922                         save_screen(vc);
2923                 }
2924
2925                 old_was_color = vc->vc_can_do_color;
2926                 vc->vc_sw->con_deinit(vc);
2927                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2928                 visual_init(vc, i, 0);
2929                 set_origin(vc);
2930                 update_attr(vc);
2931
2932                 /* If the console changed between mono <-> color, then
2933                  * the attributes in the screenbuf will be wrong.  The
2934                  * following resets all attributes to something sane.
2935                  */
2936                 if (old_was_color != vc->vc_can_do_color)
2937                         clear_buffer_attributes(vc);
2938         }
2939
2940         printk("Console: switching ");
2941         if (!deflt)
2942                 printk("consoles %d-%d ", first+1, last+1);
2943         if (j >= 0) {
2944                 struct vc_data *vc = vc_cons[j].d;
2945
2946                 printk("to %s %s %dx%d\n",
2947                        vc->vc_can_do_color ? "colour" : "mono",
2948                        desc, vc->vc_cols, vc->vc_rows);
2949
2950                 if (k >= 0) {
2951                         vc = vc_cons[k].d;
2952                         update_screen(vc);
2953                 }
2954         } else
2955                 printk("to %s\n", desc);
2956
2957         retval = 0;
2958 err:
2959         release_console_sem();
2960         module_put(owner);
2961         return retval;
2962 };
2963
2964 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2965 static int con_is_graphics(const struct consw *csw, int first, int last)
2966 {
2967         int i, retval = 0;
2968
2969         for (i = first; i <= last; i++) {
2970                 struct vc_data *vc = vc_cons[i].d;
2971
2972                 if (vc && vc->vc_mode == KD_GRAPHICS) {
2973                         retval = 1;
2974                         break;
2975                 }
2976         }
2977
2978         return retval;
2979 }
2980
2981 static int unbind_con_driver(const struct consw *csw, int first, int last,
2982                              int deflt)
2983 {
2984         struct module *owner = csw->owner;
2985         const struct consw *defcsw = NULL;
2986         struct con_driver *con_driver = NULL, *con_back = NULL;
2987         int i, retval = -ENODEV;
2988
2989         if (!try_module_get(owner))
2990                 return -ENODEV;
2991
2992         acquire_console_sem();
2993
2994         /* check if driver is registered and if it is unbindable */
2995         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2996                 con_driver = &registered_con_driver[i];
2997
2998                 if (con_driver->con == csw &&
2999                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3000                         retval = 0;
3001                         break;
3002                 }
3003         }
3004
3005         if (retval) {
3006                 release_console_sem();
3007                 goto err;
3008         }
3009
3010         retval = -ENODEV;
3011
3012         /* check if backup driver exists */
3013         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3014                 con_back = &registered_con_driver[i];
3015
3016                 if (con_back->con &&
3017                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3018                         defcsw = con_back->con;
3019                         retval = 0;
3020                         break;
3021                 }
3022         }
3023
3024         if (retval) {
3025                 release_console_sem();
3026                 goto err;
3027         }
3028
3029         if (!con_is_bound(csw)) {
3030                 release_console_sem();
3031                 goto err;
3032         }
3033
3034         first = max(first, con_driver->first);
3035         last = min(last, con_driver->last);
3036
3037         for (i = first; i <= last; i++) {
3038                 if (con_driver_map[i] == csw) {
3039                         module_put(csw->owner);
3040                         con_driver_map[i] = NULL;
3041                 }
3042         }
3043
3044         if (!con_is_bound(defcsw)) {
3045                 const struct consw *defconsw = conswitchp;
3046
3047                 defcsw->con_startup();
3048                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3049                 /*
3050                  * vgacon may change the default driver to point
3051                  * to dummycon, we restore it here...
3052                  */
3053                 conswitchp = defconsw;
3054         }
3055
3056         if (!con_is_bound(csw))
3057                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3058
3059         release_console_sem();
3060         /* ignore return value, binding should not fail */
3061         bind_con_driver(defcsw, first, last, deflt);
3062 err:
3063         module_put(owner);
3064         return retval;
3065
3066 }
3067
3068 static int vt_bind(struct con_driver *con)
3069 {
3070         const struct consw *defcsw = NULL, *csw = NULL;
3071         int i, more = 1, first = -1, last = -1, deflt = 0;
3072
3073         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3074             con_is_graphics(con->con, con->first, con->last))
3075                 goto err;
3076
3077         csw = con->con;
3078
3079         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3080                 struct con_driver *con = &registered_con_driver[i];
3081
3082                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3083                         defcsw = con->con;
3084                         break;
3085                 }
3086         }
3087
3088         if (!defcsw)
3089                 goto err;
3090
3091         while (more) {
3092                 more = 0;
3093
3094                 for (i = con->first; i <= con->last; i++) {
3095                         if (con_driver_map[i] == defcsw) {
3096                                 if (first == -1)
3097                                         first = i;
3098                                 last = i;
3099                                 more = 1;
3100                         } else if (first != -1)
3101                                 break;
3102                 }
3103
3104                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3105                         deflt = 1;
3106
3107                 if (first != -1)
3108                         bind_con_driver(csw, first, last, deflt);
3109
3110                 first = -1;
3111                 last = -1;
3112                 deflt = 0;
3113         }
3114
3115 err:
3116         return 0;
3117 }
3118
3119 static int vt_unbind(struct con_driver *con)
3120 {
3121         const struct consw *csw = NULL;
3122         int i, more = 1, first = -1, last = -1, deflt = 0;
3123
3124         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3125             con_is_graphics(con->con, con->first, con->last))
3126                 goto err;
3127
3128         csw = con->con;
3129
3130         while (more) {
3131                 more = 0;
3132
3133                 for (i = con->first; i <= con->last; i++) {
3134                         if (con_driver_map[i] == csw) {
3135                                 if (first == -1)
3136                                         first = i;
3137                                 last = i;
3138                                 more = 1;
3139                         } else if (first != -1)
3140                                 break;
3141                 }
3142
3143                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3144                         deflt = 1;
3145
3146                 if (first != -1)
3147                         unbind_con_driver(csw, first, last, deflt);
3148
3149                 first = -1;
3150                 last = -1;
3151                 deflt = 0;
3152         }
3153
3154 err:
3155         return 0;
3156 }
3157 #else
3158 static inline int vt_bind(struct con_driver *con)
3159 {
3160         return 0;
3161 }
3162 static inline int vt_unbind(struct con_driver *con)
3163 {
3164         return 0;
3165 }
3166 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3167
3168 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3169                           const char *buf, size_t count)
3170 {
3171         struct con_driver *con = dev_get_drvdata(dev);
3172         int bind = simple_strtoul(buf, NULL, 0);
3173
3174         if (bind)
3175                 vt_bind(con);
3176         else
3177                 vt_unbind(con);
3178
3179         return count;
3180 }
3181
3182 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3183                          char *buf)
3184 {
3185         struct con_driver *con = dev_get_drvdata(dev);
3186         int bind = con_is_bound(con->con);
3187
3188         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3189 }
3190
3191 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3192                          char *buf)
3193 {
3194         struct con_driver *con = dev_get_drvdata(dev);
3195
3196         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3197                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3198                          con->desc);
3199
3200 }
3201
3202 static struct device_attribute device_attrs[] = {
3203         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3204         __ATTR(name, S_IRUGO, show_name, NULL),
3205 };
3206
3207 static int vtconsole_init_device(struct con_driver *con)
3208 {
3209         int i;
3210         int error = 0;
3211
3212         con->flag |= CON_DRIVER_FLAG_ATTR;
3213         dev_set_drvdata(con->dev, con);
3214         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3215                 error = device_create_file(con->dev, &device_attrs[i]);
3216                 if (error)
3217                         break;
3218         }
3219
3220         if (error) {
3221                 while (--i >= 0)
3222                         device_remove_file(con->dev, &device_attrs[i]);
3223                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3224         }
3225
3226         return error;
3227 }
3228
3229 static void vtconsole_deinit_device(struct con_driver *con)
3230 {
3231         int i;
3232
3233         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3234                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3235                         device_remove_file(con->dev, &device_attrs[i]);
3236                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3237         }
3238 }
3239
3240 /**
3241  * con_is_bound - checks if driver is bound to the console
3242  * @csw: console driver
3243  *
3244  * RETURNS: zero if unbound, nonzero if bound
3245  *
3246  * Drivers can call this and if zero, they should release
3247  * all resources allocated on con_startup()
3248  */
3249 int con_is_bound(const struct consw *csw)
3250 {
3251         int i, bound = 0;
3252
3253         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3254                 if (con_driver_map[i] == csw) {
3255                         bound = 1;
3256                         break;
3257                 }
3258         }
3259
3260         return bound;
3261 }
3262 EXPORT_SYMBOL(con_is_bound);
3263
3264 /**
3265  * register_con_driver - register console driver to console layer
3266  * @csw: console driver
3267  * @first: the first console to take over, minimum value is 0
3268  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3269  *
3270  * DESCRIPTION: This function registers a console driver which can later
3271  * bind to a range of consoles specified by @first and @last. It will
3272  * also initialize the console driver by calling con_startup().
3273  */
3274 int register_con_driver(const struct consw *csw, int first, int last)
3275 {
3276         struct module *owner = csw->owner;
3277         struct con_driver *con_driver;
3278         const char *desc;
3279         int i, retval = 0;
3280
3281         if (!try_module_get(owner))
3282                 return -ENODEV;
3283
3284         acquire_console_sem();
3285
3286         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3287                 con_driver = &registered_con_driver[i];
3288
3289                 /* already registered */
3290                 if (con_driver->con == csw)
3291                         retval = -EINVAL;
3292         }
3293
3294         if (retval)
3295                 goto err;
3296
3297         desc = csw->con_startup();
3298
3299         if (!desc)
3300                 goto err;
3301
3302         retval = -EINVAL;
3303
3304         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3305                 con_driver = &registered_con_driver[i];
3306
3307                 if (con_driver->con == NULL) {
3308                         con_driver->con = csw;
3309                         con_driver->desc = desc;
3310                         con_driver->node = i;
3311                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3312                                            CON_DRIVER_FLAG_INIT;
3313                         con_driver->first = first;
3314                         con_driver->last = last;
3315                         retval = 0;
3316                         break;
3317                 }
3318         }
3319
3320         if (retval)
3321                 goto err;
3322
3323         con_driver->dev = device_create(vtconsole_class, NULL,
3324                                         MKDEV(0, con_driver->node),
3325                                         "vtcon%i", con_driver->node);
3326
3327         if (IS_ERR(con_driver->dev)) {
3328                 printk(KERN_WARNING "Unable to create device for %s; "
3329                        "errno = %ld\n", con_driver->desc,
3330                        PTR_ERR(con_driver->dev));
3331                 con_driver->dev = NULL;
3332         } else {
3333                 vtconsole_init_device(con_driver);
3334         }
3335
3336 err:
3337         release_console_sem();
3338         module_put(owner);
3339         return retval;
3340 }
3341 EXPORT_SYMBOL(register_con_driver);
3342
3343 /**
3344  * unregister_con_driver - unregister console driver from console layer
3345  * @csw: console driver
3346  *
3347  * DESCRIPTION: All drivers that registers to the console layer must
3348  * call this function upon exit, or if the console driver is in a state
3349  * where it won't be able to handle console services, such as the
3350  * framebuffer console without loaded framebuffer drivers.
3351  *
3352  * The driver must unbind first prior to unregistration.
3353  */
3354 int unregister_con_driver(const struct consw *csw)
3355 {
3356         int i, retval = -ENODEV;
3357
3358         acquire_console_sem();
3359
3360         /* cannot unregister a bound driver */
3361         if (con_is_bound(csw))
3362                 goto err;
3363
3364         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3365                 struct con_driver *con_driver = &registered_con_driver[i];
3366
3367                 if (con_driver->con == csw &&
3368                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3369                         vtconsole_deinit_device(con_driver);
3370                         device_destroy(vtconsole_class,
3371                                        MKDEV(0, con_driver->node));
3372                         con_driver->con = NULL;
3373                         con_driver->desc = NULL;
3374                         con_driver->dev = NULL;
3375                         con_driver->node = 0;
3376                         con_driver->flag = 0;
3377                         con_driver->first = 0;
3378                         con_driver->last = 0;
3379                         retval = 0;
3380                         break;
3381                 }
3382         }
3383 err:
3384         release_console_sem();
3385         return retval;
3386 }
3387 EXPORT_SYMBOL(unregister_con_driver);
3388
3389 /*
3390  *      If we support more console drivers, this function is used
3391  *      when a driver wants to take over some existing consoles
3392  *      and become default driver for newly opened ones.
3393  *
3394  *      take_over_console is basically a register followed by unbind
3395  */
3396 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3397 {
3398         int err;
3399
3400         err = register_con_driver(csw, first, last);
3401
3402         if (!err)
3403                 bind_con_driver(csw, first, last, deflt);
3404
3405         return err;
3406 }
3407
3408 /*
3409  * give_up_console is a wrapper to unregister_con_driver. It will only
3410  * work if driver is fully unbound.
3411  */
3412 void give_up_console(const struct consw *csw)
3413 {
3414         unregister_con_driver(csw);
3415 }
3416
3417 static int __init vtconsole_class_init(void)
3418 {
3419         int i;
3420
3421         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3422         if (IS_ERR(vtconsole_class)) {
3423                 printk(KERN_WARNING "Unable to create vt console class; "
3424                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3425                 vtconsole_class = NULL;
3426         }
3427
3428         /* Add system drivers to sysfs */
3429         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3430                 struct con_driver *con = &registered_con_driver[i];
3431
3432                 if (con->con && !con->dev) {
3433                         con->dev = device_create(vtconsole_class, NULL,
3434                                                  MKDEV(0, con->node),
3435                                                  "vtcon%i", con->node);
3436
3437                         if (IS_ERR(con->dev)) {
3438                                 printk(KERN_WARNING "Unable to create "
3439                                        "device for %s; errno = %ld\n",
3440                                        con->desc, PTR_ERR(con->dev));
3441                                 con->dev = NULL;
3442                         } else {
3443                                 vtconsole_init_device(con);
3444                         }
3445                 }
3446         }
3447
3448         return 0;
3449 }
3450 postcore_initcall(vtconsole_class_init);
3451
3452 #endif
3453
3454 /*
3455  *      Screen blanking
3456  */
3457
3458 static int set_vesa_blanking(char __user *p)
3459 {
3460         unsigned int mode;
3461
3462         if (get_user(mode, p + 1))
3463                 return -EFAULT;
3464
3465         vesa_blank_mode = (mode < 4) ? mode : 0;
3466         return 0;
3467 }
3468
3469 void do_blank_screen(int entering_gfx)
3470 {
3471         struct vc_data *vc = vc_cons[fg_console].d;
3472         int i;
3473
3474         WARN_CONSOLE_UNLOCKED();
3475
3476         if (console_blanked) {
3477                 if (blank_state == blank_vesa_wait) {
3478                         blank_state = blank_off;
3479                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3480                 }
3481                 return;
3482         }
3483         if (blank_state != blank_normal_wait)
3484                 return;
3485         blank_state = blank_off;
3486
3487         /* entering graphics mode? */
3488         if (entering_gfx) {
3489                 hide_cursor(vc);
3490                 save_screen(vc);
3491                 vc->vc_sw->con_blank(vc, -1, 1);
3492                 console_blanked = fg_console + 1;
3493                 set_origin(vc);
3494                 return;
3495         }
3496
3497         /* don't blank graphics */
3498         if (vc->vc_mode != KD_TEXT) {
3499                 console_blanked = fg_console + 1;
3500                 return;
3501         }
3502
3503         hide_cursor(vc);
3504         del_timer_sync(&console_timer);
3505         blank_timer_expired = 0;
3506
3507         save_screen(vc);
3508         /* In case we need to reset origin, blanking hook returns 1 */
3509         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3510         console_blanked = fg_console + 1;
3511         if (i)
3512                 set_origin(vc);
3513
3514         if (console_blank_hook && console_blank_hook(1))
3515                 return;
3516
3517         if (vesa_off_interval && vesa_blank_mode) {
3518                 blank_state = blank_vesa_wait;
3519                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3520         }
3521 }
3522 EXPORT_SYMBOL(do_blank_screen);
3523
3524 /*
3525  * Called by timer as well as from vt_console_driver
3526  */
3527 void do_unblank_screen(int leaving_gfx)
3528 {
3529         struct vc_data *vc;
3530
3531         /* This should now always be called from a "sane" (read: can schedule)
3532          * context for the sake of the low level drivers, except in the special
3533          * case of oops_in_progress
3534          */
3535         if (!oops_in_progress)
3536                 might_sleep();
3537
3538         WARN_CONSOLE_UNLOCKED();
3539
3540         ignore_poke = 0;
3541         if (!console_blanked)
3542                 return;
3543         if (!vc_cons_allocated(fg_console)) {
3544                 /* impossible */
3545                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3546                 return;
3547         }
3548         vc = vc_cons[fg_console].d;
3549         if (vc->vc_mode != KD_TEXT)
3550                 return; /* but leave console_blanked != 0 */
3551
3552         if (blankinterval) {
3553                 mod_timer(&console_timer, jiffies + blankinterval);
3554                 blank_state = blank_normal_wait;
3555         }
3556
3557         console_blanked = 0;
3558         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3559                 /* Low-level driver cannot restore -> do it ourselves */
3560                 update_screen(vc);
3561         if (console_blank_hook)
3562                 console_blank_hook(0);
3563         set_palette(vc);
3564         set_cursor(vc);
3565 }
3566 EXPORT_SYMBOL(do_unblank_screen);
3567
3568 /*
3569  * This is called by the outside world to cause a forced unblank, mostly for
3570  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3571  * call it with 1 as an argument and so force a mode restore... that may kill
3572  * X or at least garbage the screen but would also make the Oops visible...
3573  */
3574 void unblank_screen(void)
3575 {
3576         do_unblank_screen(0);
3577 }
3578
3579 /*
3580  * We defer the timer blanking to work queue so it can take the console mutex
3581  * (console operations can still happen at irq time, but only from printk which
3582  * has the console mutex. Not perfect yet, but better than no locking
3583  */
3584 static void blank_screen_t(unsigned long dummy)
3585 {
3586         if (unlikely(!keventd_up())) {
3587                 mod_timer(&console_timer, jiffies + blankinterval);
3588                 return;
3589         }
3590         blank_timer_expired = 1;
3591         schedule_work(&console_work);
3592 }
3593
3594 void poke_blanked_console(void)
3595 {
3596         WARN_CONSOLE_UNLOCKED();
3597
3598         /* Add this so we quickly catch whoever might call us in a non
3599          * safe context. Nowadays, unblank_screen() isn't to be called in
3600          * atomic contexts and is allowed to schedule (with the special case
3601          * of oops_in_progress, but that isn't of any concern for this
3602          * function. --BenH.
3603          */
3604         might_sleep();
3605
3606         /* This isn't perfectly race free, but a race here would be mostly harmless,
3607          * at worse, we'll do a spurrious blank and it's unlikely
3608          */
3609         del_timer(&console_timer);
3610         blank_timer_expired = 0;
3611
3612         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3613                 return;
3614         if (console_blanked)
3615                 unblank_screen();
3616         else if (blankinterval) {
3617                 mod_timer(&console_timer, jiffies + blankinterval);
3618                 blank_state = blank_normal_wait;
3619         }
3620 }
3621
3622 /*
3623  *      Palettes
3624  */
3625
3626 static void set_palette(struct vc_data *vc)
3627 {
3628         WARN_CONSOLE_UNLOCKED();
3629
3630         if (vc->vc_mode != KD_GRAPHICS)
3631                 vc->vc_sw->con_set_palette(vc, color_table);
3632 }
3633
3634 static int set_get_cmap(unsigned char __user *arg, int set)
3635 {
3636     int i, j, k;
3637
3638     WARN_CONSOLE_UNLOCKED();
3639
3640     for (i = 0; i < 16; i++)
3641         if (set) {
3642             get_user(default_red[i], arg++);
3643             get_user(default_grn[i], arg++);
3644             get_user(default_blu[i], arg++);
3645         } else {
3646             put_user(default_red[i], arg++);
3647             put_user(default_grn[i], arg++);
3648             put_user(default_blu[i], arg++);
3649         }
3650     if (set) {
3651         for (i = 0; i < MAX_NR_CONSOLES; i++)
3652             if (vc_cons_allocated(i)) {
3653                 for (j = k = 0; j < 16; j++) {
3654                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3655                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3656                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3657                 }
3658                 set_palette(vc_cons[i].d);
3659             }
3660     }
3661     return 0;
3662 }
3663
3664 /*
3665  * Load palette into the DAC registers. arg points to a colour
3666  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3667  */
3668
3669 int con_set_cmap(unsigned char __user *arg)
3670 {
3671         int rc;
3672
3673         acquire_console_sem();
3674         rc = set_get_cmap (arg,1);
3675         release_console_sem();
3676
3677         return rc;
3678 }
3679
3680 int con_get_cmap(unsigned char __user *arg)
3681 {
3682         int rc;
3683
3684         acquire_console_sem();
3685         rc = set_get_cmap (arg,0);
3686         release_console_sem();
3687
3688         return rc;
3689 }
3690
3691 void reset_palette(struct vc_data *vc)
3692 {
3693         int j, k;
3694         for (j=k=0; j<16; j++) {
3695                 vc->vc_palette[k++] = default_red[j];
3696                 vc->vc_palette[k++] = default_grn[j];
3697                 vc->vc_palette[k++] = default_blu[j];
3698         }
3699         set_palette(vc);
3700 }
3701
3702 /*
3703  *  Font switching
3704  *
3705  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3706  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3707  *  depending on width) reserved for each character which is kinda wasty, but
3708  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3709  *  is upto the actual low-level console-driver convert data into its favorite
3710  *  format (maybe we should add a `fontoffset' field to the `display'
3711  *  structure so we won't have to convert the fontdata all the time.
3712  *  /Jes
3713  */
3714
3715 #define max_font_size 65536
3716
3717 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3718 {
3719         struct console_font font;
3720         int rc = -EINVAL;
3721         int c;
3722
3723         if (vc->vc_mode != KD_TEXT)
3724                 return -EINVAL;
3725
3726         if (op->data) {
3727                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3728                 if (!font.data)
3729                         return -ENOMEM;
3730         } else
3731                 font.data = NULL;
3732
3733         acquire_console_sem();
3734         if (vc->vc_sw->con_font_get)
3735                 rc = vc->vc_sw->con_font_get(vc, &font);
3736         else
3737                 rc = -ENOSYS;
3738         release_console_sem();
3739
3740         if (rc)
3741                 goto out;
3742
3743         c = (font.width+7)/8 * 32 * font.charcount;
3744
3745         if (op->data && font.charcount > op->charcount)
3746                 rc = -ENOSPC;
3747         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3748                 if (font.width > op->width || font.height > op->height)
3749                         rc = -ENOSPC;
3750         } else {
3751                 if (font.width != 8)
3752                         rc = -EIO;
3753                 else if ((op->height && font.height > op->height) ||
3754                          font.height > 32)
3755                         rc = -ENOSPC;
3756         }
3757         if (rc)
3758                 goto out;
3759
3760         op->height = font.height;
3761         op->width = font.width;
3762         op->charcount = font.charcount;
3763
3764         if (op->data && copy_to_user(op->data, font.data, c))
3765                 rc = -EFAULT;
3766
3767 out:
3768         kfree(font.data);
3769         return rc;
3770 }
3771
3772 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3773 {
3774         struct console_font font;
3775         int rc = -EINVAL;
3776         int size;
3777
3778         if (vc->vc_mode != KD_TEXT)
3779                 return -EINVAL;
3780         if (!op->data)
3781                 return -EINVAL;
3782         if (op->charcount > 512)
3783                 return -EINVAL;
3784         if (!op->height) {              /* Need to guess font height [compat] */
3785                 int h, i;
3786                 u8 __user *charmap = op->data;
3787                 u8 tmp;
3788
3789                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3790                    so that we can get rid of this soon */
3791                 if (!(op->flags & KD_FONT_FLAG_OLD))
3792                         return -EINVAL;
3793                 for (h = 32; h > 0; h--)
3794                         for (i = 0; i < op->charcount; i++) {
3795                                 if (get_user(tmp, &charmap[32*i+h-1]))
3796                                         return -EFAULT;
3797                                 if (tmp)
3798                                         goto nonzero;
3799                         }
3800                 return -EINVAL;
3801         nonzero:
3802                 op->height = h;
3803         }
3804         if (op->width <= 0 || op->width > 32 || op->height > 32)
3805                 return -EINVAL;
3806         size = (op->width+7)/8 * 32 * op->charcount;
3807         if (size > max_font_size)
3808                 return -ENOSPC;
3809         font.charcount = op->charcount;
3810         font.height = op->height;
3811         font.width = op->width;
3812         font.data = kmalloc(size, GFP_KERNEL);
3813         if (!font.data)
3814                 return -ENOMEM;
3815         if (copy_from_user(font.data, op->data, size)) {
3816                 kfree(font.data);
3817                 return -EFAULT;
3818         }
3819         acquire_console_sem();
3820         if (vc->vc_sw->con_font_set)
3821                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3822         else
3823                 rc = -ENOSYS;
3824         release_console_sem();
3825         kfree(font.data);
3826         return rc;
3827 }
3828
3829 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3830 {
3831         struct console_font font = {.width = op->width, .height = op->height};
3832         char name[MAX_FONT_NAME];
3833         char *s = name;
3834         int rc;
3835
3836         if (vc->vc_mode != KD_TEXT)
3837                 return -EINVAL;
3838
3839         if (!op->data)
3840                 s = NULL;
3841         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3842                 return -EFAULT;
3843         else
3844                 name[MAX_FONT_NAME - 1] = 0;
3845
3846         acquire_console_sem();
3847         if (vc->vc_sw->con_font_default)
3848                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3849         else
3850                 rc = -ENOSYS;
3851         release_console_sem();
3852         if (!rc) {
3853                 op->width = font.width;
3854                 op->height = font.height;
3855         }
3856         return rc;
3857 }
3858
3859 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3860 {
3861         int con = op->height;
3862         int rc;
3863
3864         if (vc->vc_mode != KD_TEXT)
3865                 return -EINVAL;
3866
3867         acquire_console_sem();
3868         if (!vc->vc_sw->con_font_copy)
3869                 rc = -ENOSYS;
3870         else if (con < 0 || !vc_cons_allocated(con))
3871                 rc = -ENOTTY;
3872         else if (con == vc->vc_num)     /* nothing to do */
3873                 rc = 0;
3874         else
3875                 rc = vc->vc_sw->con_font_copy(vc, con);
3876         release_console_sem();
3877         return rc;
3878 }
3879
3880 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3881 {
3882         switch (op->op) {
3883         case KD_FONT_OP_SET:
3884                 return con_font_set(vc, op);
3885         case KD_FONT_OP_GET:
3886                 return con_font_get(vc, op);
3887         case KD_FONT_OP_SET_DEFAULT:
3888                 return con_font_default(vc, op);
3889         case KD_FONT_OP_COPY:
3890                 return con_font_copy(vc, op);
3891         }
3892         return -ENOSYS;
3893 }
3894
3895 /*
3896  *      Interface exported to selection and vcs.
3897  */
3898
3899 /* used by selection */
3900 u16 screen_glyph(struct vc_data *vc, int offset)
3901 {
3902         u16 w = scr_readw(screenpos(vc, offset, 1));
3903         u16 c = w & 0xff;
3904
3905         if (w & vc->vc_hi_font_mask)
3906                 c |= 0x100;
3907         return c;
3908 }
3909
3910 /* used by vcs - note the word offset */
3911 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3912 {
3913         return screenpos(vc, 2 * w_offset, viewed);
3914 }
3915
3916 void getconsxy(struct vc_data *vc, unsigned char *p)
3917 {
3918         p[0] = vc->vc_x;
3919         p[1] = vc->vc_y;
3920 }
3921
3922 void putconsxy(struct vc_data *vc, unsigned char *p)
3923 {
3924         hide_cursor(vc);
3925         gotoxy(vc, p[0], p[1]);
3926         set_cursor(vc);
3927 }
3928
3929 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3930 {
3931         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3932                 return softcursor_original;
3933         return scr_readw(org);
3934 }
3935
3936 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3937 {
3938         scr_writew(val, org);
3939         if ((unsigned long)org == vc->vc_pos) {
3940                 softcursor_original = -1;
3941                 add_softcursor(vc);
3942         }
3943 }
3944
3945 /*
3946  *      Visible symbols for modules
3947  */
3948
3949 EXPORT_SYMBOL(color_table);
3950 EXPORT_SYMBOL(default_red);
3951 EXPORT_SYMBOL(default_grn);
3952 EXPORT_SYMBOL(default_blu);
3953 EXPORT_SYMBOL(update_region);
3954 EXPORT_SYMBOL(redraw_screen);
3955 EXPORT_SYMBOL(vc_resize);
3956 EXPORT_SYMBOL(vc_lock_resize);
3957 EXPORT_SYMBOL(fg_console);
3958 EXPORT_SYMBOL(console_blank_hook);
3959 EXPORT_SYMBOL(console_blanked);
3960 EXPORT_SYMBOL(vc_cons);
3961 #ifndef VT_SINGLE_DRIVER
3962 EXPORT_SYMBOL(take_over_console);
3963 EXPORT_SYMBOL(give_up_console);
3964 #endif