drivers/tty/vt/vt.c

   1 /*
   2  *  Copyright (C) 1991, 1992  Linus Torvalds
   3  */
   4
   5 /*
   6  * Hopefully this will be a rather complete VT102 implementation.
   7  *
   8  * Beeping thanks to John T Kohl.
   9  *
  10  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  11  *   Chars, and VT100 enhancements by Peter MacDonald.
  12  *
  13  * Copy and paste function by Andrew Haylett,
  14  *   some enhancements by Alessandro Rubini.
  15  *
  16  * Code to check for different video-cards mostly by Galen Hunt,
  17  * <[email protected]>
  18  *
  19  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  20  * Markus Kuhn, <[email protected]>.
  21  *
  22  * Dynamic allocation of consoles, [email protected], May 1994
  23  * Resizing of consoles, aeb, 940926
  24  *
  25  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  26  * <[email protected]>
  27  *
  28  * User-defined bell sound, new setterm control sequences and printk
  29  * redirection by Martin Mares <[email protected]> 19-Nov-95
  30  *
  31  * APM screenblank bug fixed Takashi Manabe <[email protected]>
  32  *
  33  * Merge with the abstract console driver by Geert Uytterhoeven
  34  * <[email protected]>, Jan 1997.
  35  *
  36  *   Original m68k console driver modifications by
  37  *
  38  *     - Arno Griffioen <[email protected]>
  39  *     - David Carter <[email protected]>
  40  *
  41  *   The abstract console driver provides a generic interface for a text
  42  *   console. It supports VGA text mode, frame buffer based graphical consoles
  43  *   and special graphics processors that are only accessible through some
  44  *   registers (e.g. a TMS340x0 GSP).
  45  *
  46  *   The interface to the hardware is specified using a special structure
  47  *   (struct consw) which contains function pointers to console operations
  48  *   (see <linux/console.h> for more information).
  49  *
  50  * Support for changeable cursor shape
  51  * by Pavel Machek <[email protected]>, August 1997
  52  *
  53  * Ported to i386 and con_scrolldelta fixed
  54  * by Emmanuel Marty <[email protected]>, April 1998
  55  *
  56  * Resurrected character buffers in videoram plus lots of other trickery
  57  * by Martin Mares <[email protected]>, July 1998
  58  *
  59  * Removed old-style timers, introduced console_timer, made timer
  60  * deletion SMP-safe.  17Jun00, Andrew Morton
  61  *
  62  * Removed console_lock, enabled interrupts across all console operations
  63  * 13 March 2001, Andrew Morton
  64  *
  65  * Fixed UTF-8 mode so alternate charset modes always work according
  66  * to control sequences interpreted in do_con_trol function
  67  * preserving backward VT100 semigraphics compatibility,
  68  * malformed UTF sequences represented as sequences of replacement glyphs,
  69  * original codes or '?' as a last resort if replacement glyph is undefined
  70  * by Adam Tla/lka <[email protected]>, Aug 2006
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/types.h>
  75 #include <linux/sched.h>
  76 #include <linux/tty.h>
  77 #include <linux/tty_flip.h>
  78 #include <linux/kernel.h>
  79 #include <linux/string.h>
  80 #include <linux/errno.h>
  81 #include <linux/kd.h>
  82 #include <linux/slab.h>
  83 #include <linux/major.h>
  84 #include <linux/mm.h>
  85 #include <linux/console.h>
  86 #include <linux/init.h>
  87 #include <linux/mutex.h>
  88 #include <linux/vt_kern.h>
  89 #include <linux/selection.h>
  90 #include <linux/tiocl.h>
  91 #include <linux/kbd_kern.h>
  92 #include <linux/consolemap.h>
  93 #include <linux/timer.h>
  94 #include <linux/interrupt.h>
  95 #include <linux/workqueue.h>
  96 #include <linux/pm.h>
  97 #include <linux/font.h>
  98 #include <linux/bitops.h>
  99 #include <linux/notifier.h>
 100 #include <linux/device.h>
 101 #include <linux/io.h>
 102 #include <linux/uaccess.h>
 103 #include <linux/kdb.h>
 104 #include <linux/ctype.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 #define CON_DRIVER_FLAG_ZOMBIE 8
 112
 113 struct con_driver {
 114         const struct consw *con;
 115         const char *desc;
 116         struct device *dev;
 117         int node;
 118         int first;
 119         int last;
 120         int flag;
 121 };
 122
 123 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 124 const struct consw *conswitchp;
 125
 126 /* A bitmap for codes <32. A bit of 1 indicates that the code
 127  * corresponding to that bit number invokes some special action
 128  * (such as cursor movement) and should not be displayed as a
 129  * glyph unless the disp_ctrl mode is explicitly enabled.
 130  */
 131 #define CTRL_ACTION 0x0d00ff81
 132 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 133
 134 /*
 135  * Here is the default bell parameters: 750HZ, 1/8th of a second
 136  */
 137 #define DEFAULT_BELL_PITCH      750
 138 #define DEFAULT_BELL_DURATION   (HZ/8)
 139 #define DEFAULT_CURSOR_BLINK_MS 200
 140
 141 struct vc vc_cons [MAX_NR_CONSOLES];
 142
 143 #ifndef VT_SINGLE_DRIVER
 144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 145 #endif
 146
 147 static int con_open(struct tty_struct *, struct file *);
 148 static void vc_init(struct vc_data *vc, unsigned int rows,
 149                     unsigned int cols, int do_clear);
 150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 151 static void save_cur(struct vc_data *vc);
 152 static void reset_terminal(struct vc_data *vc, int do_clear);
 153 static void con_flush_chars(struct tty_struct *tty);
 154 static int set_vesa_blanking(char __user *p);
 155 static void set_cursor(struct vc_data *vc);
 156 static void hide_cursor(struct vc_data *vc);
 157 static void console_callback(struct work_struct *ignored);
 158 static void con_driver_unregister_callback(struct work_struct *ignored);
 159 static void blank_screen_t(unsigned long dummy);
 160 static void set_palette(struct vc_data *vc);
 161
 162 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
 163
 164 static int printable;           /* Is console ready for printing? */
 165 int default_utf8 = true;
 166 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 167 int global_cursor_default = -1;
 168 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 169
 170 static int cur_default = CUR_DEFAULT;
 171 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 172
 173 /*
 174  * ignore_poke: don't unblank the screen when things are typed.  This is
 175  * mainly for the privacy of braille terminal users.
 176  */
 177 static int ignore_poke;
 178
 179 int do_poke_blanked_console;
 180 int console_blanked;
 181
 182 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 183 static int vesa_off_interval;
 184 static int blankinterval = 10*60;
 185 core_param(consoleblank, blankinterval, int, 0444);
 186
 187 static DECLARE_WORK(console_work, console_callback);
 188 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
 189
 190 /*
 191  * fg_console is the current virtual console,
 192  * last_console is the last used one,
 193  * want_console is the console we want to switch to,
 194  * saved_* variants are for save/restore around kernel debugger enter/leave
 195  */
 196 int fg_console;
 197 int last_console;
 198 int want_console = -1;
 199 static int saved_fg_console;
 200 static int saved_last_console;
 201 static int saved_want_console;
 202 static int saved_vc_mode;
 203 static int saved_console_blanked;
 204
 205 /*
 206  * For each existing display, we have a pointer to console currently visible
 207  * on that display, allowing consoles other than fg_console to be refreshed
 208  * appropriately. Unless the low-level driver supplies its own display_fg
 209  * variable, we use this one for the "master display".
 210  */
 211 static struct vc_data *master_display_fg;
 212
 213 /*
 214  * Unfortunately, we need to delay tty echo when we're currently writing to the
 215  * console since the code is (and always was) not re-entrant, so we schedule
 216  * all flip requests to process context with schedule-task() and run it from
 217  * console_callback().
 218  */
 219
 220 /*
 221  * For the same reason, we defer scrollback to the console callback.
 222  */
 223 static int scrollback_delta;
 224
 225 /*
 226  * Hook so that the power management routines can (un)blank
 227  * the console on our behalf.
 228  */
 229 int (*console_blank_hook)(int);
 230
 231 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 232 static int blank_state;
 233 static int blank_timer_expired;
 234 enum {
 235         blank_off = 0,
 236         blank_normal_wait,
 237         blank_vesa_wait,
 238 };
 239
 240 /*
 241  * /sys/class/tty/tty0/
 242  *
 243  * the attribute 'active' contains the name of the current vc
 244  * console and it supports poll() to detect vc switches
 245  */
 246 static struct device *tty0dev;
 247
 248 /*
 249  * Notifier list for console events.
 250  */
 251 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 252
 253 int register_vt_notifier(struct notifier_block *nb)
 254 {
 255         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 256 }
 257 EXPORT_SYMBOL_GPL(register_vt_notifier);
 258
 259 int unregister_vt_notifier(struct notifier_block *nb)
 260 {
 261         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 262 }
 263 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 264
 265 static void notify_write(struct vc_data *vc, unsigned int unicode)
 266 {
 267         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 268         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 269 }
 270
 271 static void notify_update(struct vc_data *vc)
 272 {
 273         struct vt_notifier_param param = { .vc = vc };
 274         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 275 }
 276 /*
 277  *      Low-Level Functions
 278  */
 279
 280 static inline bool con_is_fg(const struct vc_data *vc)
 281 {
 282         return vc->vc_num == fg_console;
 283 }
 284
 285 static inline bool con_should_update(const struct vc_data *vc)
 286 {
 287         return con_is_visible(vc) && !console_blanked;
 288 }
 289
 290 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 291 {
 292         unsigned short *p;
 293
 294         if (!viewed)
 295                 p = (unsigned short *)(vc->vc_origin + offset);
 296         else if (!vc->vc_sw->con_screen_pos)
 297                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 298         else
 299                 p = vc->vc_sw->con_screen_pos(vc, offset);
 300         return p;
 301 }
 302
 303 /* Called  from the keyboard irq path.. */
 304 static inline void scrolldelta(int lines)
 305 {
 306         /* FIXME */
 307         /* scrolldelta needs some kind of consistency lock, but the BKL was
 308            and still is not protecting versus the scheduled back end */
 309         scrollback_delta += lines;
 310         schedule_console_callback();
 311 }
 312
 313 void schedule_console_callback(void)
 314 {
 315         schedule_work(&console_work);
 316 }
 317
 318 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 319 {
 320         unsigned short *d, *s;
 321
 322         if (t+nr >= b)
 323                 nr = b - t - 1;
 324         if (b > vc->vc_rows || t >= b || nr < 1)
 325                 return;
 326         if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 327                 return;
 328         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 329         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 330         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 331         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 332                     vc->vc_size_row * nr);
 333 }
 334
 335 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 336 {
 337         unsigned short *s;
 338         unsigned int step;
 339
 340         if (t+nr >= b)
 341                 nr = b - t - 1;
 342         if (b > vc->vc_rows || t >= b || nr < 1)
 343                 return;
 344         if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 345                 return;
 346         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 347         step = vc->vc_cols * nr;
 348         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 349         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 350 }
 351
 352 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 353 {
 354         unsigned int xx, yy, offset;
 355         u16 *p;
 356
 357         p = (u16 *) start;
 358         if (!vc->vc_sw->con_getxy) {
 359                 offset = (start - vc->vc_origin) / 2;
 360                 xx = offset % vc->vc_cols;
 361                 yy = offset / vc->vc_cols;
 362         } else {
 363                 int nxx, nyy;
 364                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 365                 xx = nxx; yy = nyy;
 366         }
 367         for(;;) {
 368                 u16 attrib = scr_readw(p) & 0xff00;
 369                 int startx = xx;
 370                 u16 *q = p;
 371                 while (xx < vc->vc_cols && count) {
 372                         if (attrib != (scr_readw(p) & 0xff00)) {
 373                                 if (p > q)
 374                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 375                                 startx = xx;
 376                                 q = p;
 377                                 attrib = scr_readw(p) & 0xff00;
 378                         }
 379                         p++;
 380                         xx++;
 381                         count--;
 382                 }
 383                 if (p > q)
 384                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 385                 if (!count)
 386                         break;
 387                 xx = 0;
 388                 yy++;
 389                 if (vc->vc_sw->con_getxy) {
 390                         p = (u16 *)start;
 391                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 392                 }
 393         }
 394 }
 395
 396 void update_region(struct vc_data *vc, unsigned long start, int count)
 397 {
 398         WARN_CONSOLE_UNLOCKED();
 399
 400         if (con_should_update(vc)) {
 401                 hide_cursor(vc);
 402                 do_update_region(vc, start, count);
 403                 set_cursor(vc);
 404         }
 405 }
 406
 407 /* Structure of attributes is hardware-dependent */
 408
 409 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 410     u8 _underline, u8 _reverse, u8 _italic)
 411 {
 412         if (vc->vc_sw->con_build_attr)
 413                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 414                        _blink, _underline, _reverse, _italic);
 415
 416 /*
 417  * ++roman: I completely changed the attribute format for monochrome
 418  * mode (!can_do_color). The formerly used MDA (monochrome display
 419  * adapter) format didn't allow the combination of certain effects.
 420  * Now the attribute is just a bit vector:
 421  *  Bit 0..1: intensity (0..2)
 422  *  Bit 2   : underline
 423  *  Bit 3   : reverse
 424  *  Bit 7   : blink
 425  */
 426         {
 427         u8 a = _color;
 428         if (!vc->vc_can_do_color)
 429                 return _intensity |
 430                        (_italic ? 2 : 0) |
 431                        (_underline ? 4 : 0) |
 432                        (_reverse ? 8 : 0) |
 433                        (_blink ? 0x80 : 0);
 434         if (_italic)
 435                 a = (a & 0xF0) | vc->vc_itcolor;
 436         else if (_underline)
 437                 a = (a & 0xf0) | vc->vc_ulcolor;
 438         else if (_intensity == 0)
 439                 a = (a & 0xf0) | vc->vc_ulcolor;
 440         if (_reverse)
 441                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 442         if (_blink)
 443                 a ^= 0x80;
 444         if (_intensity == 2)
 445                 a ^= 0x08;
 446         if (vc->vc_hi_font_mask == 0x100)
 447                 a <<= 1;
 448         return a;
 449         }
 450 }
 451
 452 static void update_attr(struct vc_data *vc)
 453 {
 454         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 455                       vc->vc_blink, vc->vc_underline,
 456                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 457         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 458 }
 459
 460 /* Note: inverting the screen twice should revert to the original state */
 461 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 462 {
 463         unsigned short *p;
 464
 465         WARN_CONSOLE_UNLOCKED();
 466
 467         count /= 2;
 468         p = screenpos(vc, offset, viewed);
 469         if (vc->vc_sw->con_invert_region) {
 470                 vc->vc_sw->con_invert_region(vc, p, count);
 471         } else {
 472                 u16 *q = p;
 473                 int cnt = count;
 474                 u16 a;
 475
 476                 if (!vc->vc_can_do_color) {
 477                         while (cnt--) {
 478                             a = scr_readw(q);
 479                             a ^= 0x0800;
 480                             scr_writew(a, q);
 481                             q++;
 482                         }
 483                 } else if (vc->vc_hi_font_mask == 0x100) {
 484                         while (cnt--) {
 485                                 a = scr_readw(q);
 486                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 487                                 scr_writew(a, q);
 488                                 q++;
 489                         }
 490                 } else {
 491                         while (cnt--) {
 492                                 a = scr_readw(q);
 493                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 494                                 scr_writew(a, q);
 495                                 q++;
 496                         }
 497                 }
 498         }
 499
 500         if (con_should_update(vc))
 501                 do_update_region(vc, (unsigned long) p, count);
 502         notify_update(vc);
 503 }
 504
 505 /* used by selection: complement pointer position */
 506 void complement_pos(struct vc_data *vc, int offset)
 507 {
 508         static int old_offset = -1;
 509         static unsigned short old;
 510         static unsigned short oldx, oldy;
 511
 512         WARN_CONSOLE_UNLOCKED();
 513
 514         if (old_offset != -1 && old_offset >= 0 &&
 515             old_offset < vc->vc_screenbuf_size) {
 516                 scr_writew(old, screenpos(vc, old_offset, 1));
 517                 if (con_should_update(vc))
 518                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 519                 notify_update(vc);
 520         }
 521
 522         old_offset = offset;
 523
 524         if (offset != -1 && offset >= 0 &&
 525             offset < vc->vc_screenbuf_size) {
 526                 unsigned short new;
 527                 unsigned short *p;
 528                 p = screenpos(vc, offset, 1);
 529                 old = scr_readw(p);
 530                 new = old ^ vc->vc_complement_mask;
 531                 scr_writew(new, p);
 532                 if (con_should_update(vc)) {
 533                         oldx = (offset >> 1) % vc->vc_cols;
 534                         oldy = (offset >> 1) / vc->vc_cols;
 535                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 536                 }
 537                 notify_update(vc);
 538         }
 539 }
 540
 541 static void insert_char(struct vc_data *vc, unsigned int nr)
 542 {
 543         unsigned short *p = (unsigned short *) vc->vc_pos;
 544
 545         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 546         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 547         vc->vc_need_wrap = 0;
 548         if (con_should_update(vc))
 549                 do_update_region(vc, (unsigned long) p,
 550                         vc->vc_cols - vc->vc_x);
 551 }
 552
 553 static void delete_char(struct vc_data *vc, unsigned int nr)
 554 {
 555         unsigned short *p = (unsigned short *) vc->vc_pos;
 556
 557         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 558         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 559                         nr * 2);
 560         vc->vc_need_wrap = 0;
 561         if (con_should_update(vc))
 562                 do_update_region(vc, (unsigned long) p,
 563                         vc->vc_cols - vc->vc_x);
 564 }
 565
 566 static int softcursor_original = -1;
 567
 568 static void add_softcursor(struct vc_data *vc)
 569 {
 570         int i = scr_readw((u16 *) vc->vc_pos);
 571         u32 type = vc->vc_cursor_type;
 572
 573         if (! (type & 0x10)) return;
 574         if (softcursor_original != -1) return;
 575         softcursor_original = i;
 576         i |= ((type >> 8) & 0xff00 );
 577         i ^= ((type) & 0xff00 );
 578         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 579         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 580         scr_writew(i, (u16 *) vc->vc_pos);
 581         if (con_should_update(vc))
 582                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 583 }
 584
 585 static void hide_softcursor(struct vc_data *vc)
 586 {
 587         if (softcursor_original != -1) {
 588                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 589                 if (con_should_update(vc))
 590                         vc->vc_sw->con_putc(vc, softcursor_original,
 591                                         vc->vc_y, vc->vc_x);
 592                 softcursor_original = -1;
 593         }
 594 }
 595
 596 static void hide_cursor(struct vc_data *vc)
 597 {
 598         if (vc == sel_cons)
 599                 clear_selection();
 600         vc->vc_sw->con_cursor(vc, CM_ERASE);
 601         hide_softcursor(vc);
 602 }
 603
 604 static void set_cursor(struct vc_data *vc)
 605 {
 606         if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
 607                 return;
 608         if (vc->vc_deccm) {
 609                 if (vc == sel_cons)
 610                         clear_selection();
 611                 add_softcursor(vc);
 612                 if ((vc->vc_cursor_type & 0x0f) != 1)
 613                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 614         } else
 615                 hide_cursor(vc);
 616 }
 617
 618 static void set_origin(struct vc_data *vc)
 619 {
 620         WARN_CONSOLE_UNLOCKED();
 621
 622         if (!con_is_visible(vc) ||
 623             !vc->vc_sw->con_set_origin ||
 624             !vc->vc_sw->con_set_origin(vc))
 625                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 626         vc->vc_visible_origin = vc->vc_origin;
 627         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 628         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 629 }
 630
 631 static void save_screen(struct vc_data *vc)
 632 {
 633         WARN_CONSOLE_UNLOCKED();
 634
 635         if (vc->vc_sw->con_save_screen)
 636                 vc->vc_sw->con_save_screen(vc);
 637 }
 638
 639 /*
 640  *      Redrawing of screen
 641  */
 642
 643 void clear_buffer_attributes(struct vc_data *vc)
 644 {
 645         unsigned short *p = (unsigned short *)vc->vc_origin;
 646         int count = vc->vc_screenbuf_size / 2;
 647         int mask = vc->vc_hi_font_mask | 0xff;
 648
 649         for (; count > 0; count--, p++) {
 650                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 651         }
 652 }
 653
 654 void redraw_screen(struct vc_data *vc, int is_switch)
 655 {
 656         int redraw = 0;
 657
 658         WARN_CONSOLE_UNLOCKED();
 659
 660         if (!vc) {
 661                 /* strange ... */
 662                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 663                 return;
 664         }
 665
 666         if (is_switch) {
 667                 struct vc_data *old_vc = vc_cons[fg_console].d;
 668                 if (old_vc == vc)
 669                         return;
 670                 if (!con_is_visible(vc))
 671                         redraw = 1;
 672                 *vc->vc_display_fg = vc;
 673                 fg_console = vc->vc_num;
 674                 hide_cursor(old_vc);
 675                 if (!con_is_visible(old_vc)) {
 676                         save_screen(old_vc);
 677                         set_origin(old_vc);
 678                 }
 679                 if (tty0dev)
 680                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 681         } else {
 682                 hide_cursor(vc);
 683                 redraw = 1;
 684         }
 685
 686         if (redraw) {
 687                 int update;
 688                 int old_was_color = vc->vc_can_do_color;
 689
 690                 set_origin(vc);
 691                 update = vc->vc_sw->con_switch(vc);
 692                 set_palette(vc);
 693                 /*
 694                  * If console changed from mono<->color, the best we can do
 695                  * is to clear the buffer attributes. As it currently stands,
 696                  * rebuilding new attributes from the old buffer is not doable
 697                  * without overly complex code.
 698                  */
 699                 if (old_was_color != vc->vc_can_do_color) {
 700                         update_attr(vc);
 701                         clear_buffer_attributes(vc);
 702                 }
 703
 704                 /* Forcibly update if we're panicing */
 705                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 706                     vt_force_oops_output(vc))
 707                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 708         }
 709         set_cursor(vc);
 710         if (is_switch) {
 711                 set_leds();
 712                 compute_shiftstate();
 713                 notify_update(vc);
 714         }
 715 }
 716
 717 /*
 718  *      Allocation, freeing and resizing of VTs.
 719  */
 720
 721 int vc_cons_allocated(unsigned int i)
 722 {
 723         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 724 }
 725
 726 static void visual_init(struct vc_data *vc, int num, int init)
 727 {
 728         /* ++Geert: vc->vc_sw->con_init determines console size */
 729         if (vc->vc_sw)
 730                 module_put(vc->vc_sw->owner);
 731         vc->vc_sw = conswitchp;
 732 #ifndef VT_SINGLE_DRIVER
 733         if (con_driver_map[num])
 734                 vc->vc_sw = con_driver_map[num];
 735 #endif
 736         __module_get(vc->vc_sw->owner);
 737         vc->vc_num = num;
 738         vc->vc_display_fg = &master_display_fg;
 739         if (vc->vc_uni_pagedir_loc)
 740                 con_free_unimap(vc);
 741         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 742         vc->vc_uni_pagedir = NULL;
 743         vc->vc_hi_font_mask = 0;
 744         vc->vc_complement_mask = 0;
 745         vc->vc_can_do_color = 0;
 746         vc->vc_panic_force_write = false;
 747         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
 748         vc->vc_sw->con_init(vc, init);
 749         if (!vc->vc_complement_mask)
 750                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 751         vc->vc_s_complement_mask = vc->vc_complement_mask;
 752         vc->vc_size_row = vc->vc_cols << 1;
 753         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 754 }
 755
 756 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 757 {
 758         struct vt_notifier_param param;
 759         struct vc_data *vc;
 760
 761         WARN_CONSOLE_UNLOCKED();
 762
 763         if (currcons >= MAX_NR_CONSOLES)
 764                 return -ENXIO;
 765
 766         if (vc_cons[currcons].d)
 767                 return 0;
 768
 769         /* due to the granularity of kmalloc, we waste some memory here */
 770         /* the alloc is done in two steps, to optimize the common situation
 771            of a 25x80 console (structsize=216, screenbuf_size=4000) */
 772         /* although the numbers above are not valid since long ago, the
 773            point is still up-to-date and the comment still has its value
 774            even if only as a historical artifact.  --mj, July 1998 */
 775         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 776         if (!vc)
 777                 return -ENOMEM;
 778
 779         vc_cons[currcons].d = vc;
 780         tty_port_init(&vc->port);
 781         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 782
 783         visual_init(vc, currcons, 1);
 784
 785         if (!*vc->vc_uni_pagedir_loc)
 786                 con_set_default_unimap(vc);
 787
 788         vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 789         if (!vc->vc_screenbuf)
 790                 goto err_free;
 791
 792         /* If no drivers have overridden us and the user didn't pass a
 793            boot option, default to displaying the cursor */
 794         if (global_cursor_default == -1)
 795                 global_cursor_default = 1;
 796
 797         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 798         vcs_make_sysfs(currcons);
 799         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 800
 801         return 0;
 802 err_free:
 803         kfree(vc);
 804         vc_cons[currcons].d = NULL;
 805         return -ENOMEM;
 806 }
 807
 808 static inline int resize_screen(struct vc_data *vc, int width, int height,
 809                                 int user)
 810 {
 811         /* Resizes the resolution of the display adapater */
 812         int err = 0;
 813
 814         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 815                 err = vc->vc_sw->con_resize(vc, width, height, user);
 816
 817         return err;
 818 }
 819
 820 /*
 821  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 822  * [this is to be used together with some user program
 823  * like resize that changes the hardware videomode]
 824  */
 825 #define VC_RESIZE_MAXCOL (32767)
 826 #define VC_RESIZE_MAXROW (32767)
 827
 828 /**
 829  *      vc_do_resize    -       resizing method for the tty
 830  *      @tty: tty being resized
 831  *      @real_tty: real tty (different to tty if a pty/tty pair)
 832  *      @vc: virtual console private data
 833  *      @cols: columns
 834  *      @lines: lines
 835  *
 836  *      Resize a virtual console, clipping according to the actual constraints.
 837  *      If the caller passes a tty structure then update the termios winsize
 838  *      information and perform any necessary signal handling.
 839  *
 840  *      Caller must hold the console semaphore. Takes the termios rwsem and
 841  *      ctrl_lock of the tty IFF a tty is passed.
 842  */
 843
 844 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 845                                 unsigned int cols, unsigned int lines)
 846 {
 847         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 848         unsigned long end;
 849         unsigned int old_rows, old_row_size;
 850         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 851         unsigned int user;
 852         unsigned short *newscreen;
 853
 854         WARN_CONSOLE_UNLOCKED();
 855
 856         if (!vc)
 857                 return -ENXIO;
 858
 859         user = vc->vc_resize_user;
 860         vc->vc_resize_user = 0;
 861
 862         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 863                 return -EINVAL;
 864
 865         new_cols = (cols ? cols : vc->vc_cols);
 866         new_rows = (lines ? lines : vc->vc_rows);
 867         new_row_size = new_cols << 1;
 868         new_screen_size = new_row_size * new_rows;
 869
 870         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 871                 return 0;
 872
 873         newscreen = kmalloc(new_screen_size, GFP_USER);
 874         if (!newscreen)
 875                 return -ENOMEM;
 876
 877         old_rows = vc->vc_rows;
 878         old_row_size = vc->vc_size_row;
 879
 880         err = resize_screen(vc, new_cols, new_rows, user);
 881         if (err) {
 882                 kfree(newscreen);
 883                 return err;
 884         }
 885
 886         vc->vc_rows = new_rows;
 887         vc->vc_cols = new_cols;
 888         vc->vc_size_row = new_row_size;
 889         vc->vc_screenbuf_size = new_screen_size;
 890
 891         rlth = min(old_row_size, new_row_size);
 892         rrem = new_row_size - rlth;
 893         old_origin = vc->vc_origin;
 894         new_origin = (long) newscreen;
 895         new_scr_end = new_origin + new_screen_size;
 896
 897         if (vc->vc_y > new_rows) {
 898                 if (old_rows - vc->vc_y < new_rows) {
 899                         /*
 900                          * Cursor near the bottom, copy contents from the
 901                          * bottom of buffer
 902                          */
 903                         old_origin += (old_rows - new_rows) * old_row_size;
 904                 } else {
 905                         /*
 906                          * Cursor is in no man's land, copy 1/2 screenful
 907                          * from the top and bottom of cursor position
 908                          */
 909                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 910                 }
 911         }
 912
 913         end = old_origin + old_row_size * min(old_rows, new_rows);
 914
 915         update_attr(vc);
 916
 917         while (old_origin < end) {
 918                 scr_memcpyw((unsigned short *) new_origin,
 919                             (unsigned short *) old_origin, rlth);
 920                 if (rrem)
 921                         scr_memsetw((void *)(new_origin + rlth),
 922                                     vc->vc_video_erase_char, rrem);
 923                 old_origin += old_row_size;
 924                 new_origin += new_row_size;
 925         }
 926         if (new_scr_end > new_origin)
 927                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 928                             new_scr_end - new_origin);
 929         kfree(vc->vc_screenbuf);
 930         vc->vc_screenbuf = newscreen;
 931         vc->vc_screenbuf_size = new_screen_size;
 932         set_origin(vc);
 933
 934         /* do part of a reset_terminal() */
 935         vc->vc_top = 0;
 936         vc->vc_bottom = vc->vc_rows;
 937         gotoxy(vc, vc->vc_x, vc->vc_y);
 938         save_cur(vc);
 939
 940         if (tty) {
 941                 /* Rewrite the requested winsize data with the actual
 942                    resulting sizes */
 943                 struct winsize ws;
 944                 memset(&ws, 0, sizeof(ws));
 945                 ws.ws_row = vc->vc_rows;
 946                 ws.ws_col = vc->vc_cols;
 947                 ws.ws_ypixel = vc->vc_scan_lines;
 948                 tty_do_resize(tty, &ws);
 949         }
 950
 951         if (con_is_visible(vc))
 952                 update_screen(vc);
 953         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 954         return err;
 955 }
 956
 957 /**
 958  *      vc_resize               -       resize a VT
 959  *      @vc: virtual console
 960  *      @cols: columns
 961  *      @rows: rows
 962  *
 963  *      Resize a virtual console as seen from the console end of things. We
 964  *      use the common vc_do_resize methods to update the structures. The
 965  *      caller must hold the console sem to protect console internals and
 966  *      vc->port.tty
 967  */
 968
 969 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 970 {
 971         return vc_do_resize(vc->port.tty, vc, cols, rows);
 972 }
 973
 974 /**
 975  *      vt_resize               -       resize a VT
 976  *      @tty: tty to resize
 977  *      @ws: winsize attributes
 978  *
 979  *      Resize a virtual terminal. This is called by the tty layer as we
 980  *      register our own handler for resizing. The mutual helper does all
 981  *      the actual work.
 982  *
 983  *      Takes the console sem and the called methods then take the tty
 984  *      termios_rwsem and the tty ctrl_lock in that order.
 985  */
 986 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 987 {
 988         struct vc_data *vc = tty->driver_data;
 989         int ret;
 990
 991         console_lock();
 992         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 993         console_unlock();
 994         return ret;
 995 }
 996
 997 struct vc_data *vc_deallocate(unsigned int currcons)
 998 {
 999         struct vc_data *vc = NULL;
1000
1001         WARN_CONSOLE_UNLOCKED();
1002
1003         if (vc_cons_allocated(currcons)) {
1004                 struct vt_notifier_param param;
1005
1006                 param.vc = vc = vc_cons[currcons].d;
1007                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1008                 vcs_remove_sysfs(currcons);
1009                 vc->vc_sw->con_deinit(vc);
1010                 put_pid(vc->vt_pid);
1011                 module_put(vc->vc_sw->owner);
1012                 kfree(vc->vc_screenbuf);
1013                 vc_cons[currcons].d = NULL;
1014         }
1015         return vc;
1016 }
1017
1018 /*
1019  *      VT102 emulator
1020  */
1021
1022 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1023 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1024 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1025
1026 #define decarm          VC_REPEAT
1027 #define decckm          VC_CKMODE
1028 #define kbdapplic       VC_APPLIC
1029 #define lnm             VC_CRLF
1030
1031 /*
1032  * this is what the terminal answers to a ESC-Z or csi0c query.
1033  */
1034 #define VT100ID "\033[?1;2c"
1035 #define VT102ID "\033[?6c"
1036
1037 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1038                                        8,12,10,14, 9,13,11,15 };
1039
1040 /* the default colour table, for VGA+ colour systems */
1041 unsigned char default_red[] = {
1042         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1043         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1044 };
1045 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1046
1047 unsigned char default_grn[] = {
1048         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1049         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1050 };
1051 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1052
1053 unsigned char default_blu[] = {
1054         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1055         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1056 };
1057 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1058
1059 /*
1060  * gotoxy() must verify all boundaries, because the arguments
1061  * might also be negative. If the given position is out of
1062  * bounds, the cursor is placed at the nearest margin.
1063  */
1064 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1065 {
1066         int min_y, max_y;
1067
1068         if (new_x < 0)
1069                 vc->vc_x = 0;
1070         else {
1071                 if (new_x >= vc->vc_cols)
1072                         vc->vc_x = vc->vc_cols - 1;
1073                 else
1074                         vc->vc_x = new_x;
1075         }
1076
1077         if (vc->vc_decom) {
1078                 min_y = vc->vc_top;
1079                 max_y = vc->vc_bottom;
1080         } else {
1081                 min_y = 0;
1082                 max_y = vc->vc_rows;
1083         }
1084         if (new_y < min_y)
1085                 vc->vc_y = min_y;
1086         else if (new_y >= max_y)
1087                 vc->vc_y = max_y - 1;
1088         else
1089                 vc->vc_y = new_y;
1090         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1091         vc->vc_need_wrap = 0;
1092 }
1093
1094 /* for absolute user moves, when decom is set */
1095 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1096 {
1097         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1098 }
1099
1100 void scrollback(struct vc_data *vc)
1101 {
1102         scrolldelta(-(vc->vc_rows / 2));
1103 }
1104
1105 void scrollfront(struct vc_data *vc, int lines)
1106 {
1107         if (!lines)
1108                 lines = vc->vc_rows / 2;
1109         scrolldelta(lines);
1110 }
1111
1112 static void lf(struct vc_data *vc)
1113 {
1114         /* don't scroll if above bottom of scrolling region, or
1115          * if below scrolling region
1116          */
1117         if (vc->vc_y + 1 == vc->vc_bottom)
1118                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1119         else if (vc->vc_y < vc->vc_rows - 1) {
1120                 vc->vc_y++;
1121                 vc->vc_pos += vc->vc_size_row;
1122         }
1123         vc->vc_need_wrap = 0;
1124         notify_write(vc, '\n');
1125 }
1126
1127 static void ri(struct vc_data *vc)
1128 {
1129         /* don't scroll if below top of scrolling region, or
1130          * if above scrolling region
1131          */
1132         if (vc->vc_y == vc->vc_top)
1133                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1134         else if (vc->vc_y > 0) {
1135                 vc->vc_y--;
1136                 vc->vc_pos -= vc->vc_size_row;
1137         }
1138         vc->vc_need_wrap = 0;
1139 }
1140
1141 static inline void cr(struct vc_data *vc)
1142 {
1143         vc->vc_pos -= vc->vc_x << 1;
1144         vc->vc_need_wrap = vc->vc_x = 0;
1145         notify_write(vc, '\r');
1146 }
1147
1148 static inline void bs(struct vc_data *vc)
1149 {
1150         if (vc->vc_x) {
1151                 vc->vc_pos -= 2;
1152                 vc->vc_x--;
1153                 vc->vc_need_wrap = 0;
1154                 notify_write(vc, '\b');
1155         }
1156 }
1157
1158 static inline void del(struct vc_data *vc)
1159 {
1160         /* ignored */
1161 }
1162
1163 static void csi_J(struct vc_data *vc, int vpar)
1164 {
1165         unsigned int count;
1166         unsigned short * start;
1167
1168         switch (vpar) {
1169                 case 0: /* erase from cursor to end of display */
1170                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1171                         start = (unsigned short *)vc->vc_pos;
1172                         break;
1173                 case 1: /* erase from start to cursor */
1174                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1175                         start = (unsigned short *)vc->vc_origin;
1176                         break;
1177                 case 3: /* erase scroll-back buffer (and whole display) */
1178                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1179                                     vc->vc_screenbuf_size >> 1);
1180                         set_origin(vc);
1181                         if (con_is_visible(vc))
1182                                 update_screen(vc);
1183                         /* fall through */
1184                 case 2: /* erase whole display */
1185                         count = vc->vc_cols * vc->vc_rows;
1186                         start = (unsigned short *)vc->vc_origin;
1187                         break;
1188                 default:
1189                         return;
1190         }
1191         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1192         if (con_should_update(vc))
1193                 do_update_region(vc, (unsigned long) start, count);
1194         vc->vc_need_wrap = 0;
1195 }
1196
1197 static void csi_K(struct vc_data *vc, int vpar)
1198 {
1199         unsigned int count;
1200         unsigned short * start;
1201
1202         switch (vpar) {
1203                 case 0: /* erase from cursor to end of line */
1204                         count = vc->vc_cols - vc->vc_x;
1205                         start = (unsigned short *)vc->vc_pos;
1206                         break;
1207                 case 1: /* erase from start of line to cursor */
1208                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1209                         count = vc->vc_x + 1;
1210                         break;
1211                 case 2: /* erase whole line */
1212                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1213                         count = vc->vc_cols;
1214                         break;
1215                 default:
1216                         return;
1217         }
1218         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1219         vc->vc_need_wrap = 0;
1220         if (con_should_update(vc))
1221                 do_update_region(vc, (unsigned long) start, count);
1222 }
1223
1224 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1225 {                                         /* not vt100? */
1226         int count;
1227
1228         if (!vpar)
1229                 vpar++;
1230         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1231
1232         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1233         if (con_should_update(vc))
1234                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1235         vc->vc_need_wrap = 0;
1236 }
1237
1238 static void default_attr(struct vc_data *vc)
1239 {
1240         vc->vc_intensity = 1;
1241         vc->vc_italic = 0;
1242         vc->vc_underline = 0;
1243         vc->vc_reverse = 0;
1244         vc->vc_blink = 0;
1245         vc->vc_color = vc->vc_def_color;
1246 }
1247
1248 struct rgb { u8 r; u8 g; u8 b; };
1249
1250 static void rgb_from_256(int i, struct rgb *c)
1251 {
1252         if (i < 8) {            /* Standard colours. */
1253                 c->r = i&1 ? 0xaa : 0x00;
1254                 c->g = i&2 ? 0xaa : 0x00;
1255                 c->b = i&4 ? 0xaa : 0x00;
1256         } else if (i < 16) {
1257                 c->r = i&1 ? 0xff : 0x55;
1258                 c->g = i&2 ? 0xff : 0x55;
1259                 c->b = i&4 ? 0xff : 0x55;
1260         } else if (i < 232) {   /* 6x6x6 colour cube. */
1261                 c->r = (i - 16) / 36 * 85 / 2;
1262                 c->g = (i - 16) / 6 % 6 * 85 / 2;
1263                 c->b = (i - 16) % 6 * 85 / 2;
1264         } else                  /* Grayscale ramp. */
1265                 c->r = c->g = c->b = i * 10 - 2312;
1266 }
1267
1268 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1269 {
1270         u8 hue = 0, max = max3(c->r, c->g, c->b);
1271
1272         if (c->r > max / 2)
1273                 hue |= 4;
1274         if (c->g > max / 2)
1275                 hue |= 2;
1276         if (c->b > max / 2)
1277                 hue |= 1;
1278
1279         if (hue == 7 && max <= 0x55) {
1280                 hue = 0;
1281                 vc->vc_intensity = 2;
1282         } else if (max > 0xaa)
1283                 vc->vc_intensity = 2;
1284         else
1285                 vc->vc_intensity = 1;
1286
1287         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1288 }
1289
1290 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1291 {
1292         /* For backgrounds, err on the dark side. */
1293         vc->vc_color = (vc->vc_color & 0x0f)
1294                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1295 }
1296
1297 /*
1298  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1299  * and thus need to be detected and ignored by hand. Strictly speaking, that
1300  * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1301  * no one produces such codes and almost no one accepts them.
1302  *
1303  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1304  * supporting them.
1305  */
1306 static int vc_t416_color(struct vc_data *vc, int i,
1307                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1308 {
1309         struct rgb c;
1310
1311         i++;
1312         if (i > vc->vc_npar)
1313                 return i;
1314
1315         if (vc->vc_par[i] == 5 && i < vc->vc_npar) {
1316                 /* 256 colours -- ubiquitous */
1317                 i++;
1318                 rgb_from_256(vc->vc_par[i], &c);
1319         } else if (vc->vc_par[i] == 2 && i <= vc->vc_npar + 3) {
1320                 /* 24 bit -- extremely rare */
1321                 c.r = vc->vc_par[i + 1];
1322                 c.g = vc->vc_par[i + 2];
1323                 c.b = vc->vc_par[i + 3];
1324                 i += 3;
1325         } else
1326                 return i;
1327
1328         set_color(vc, &c);
1329
1330         return i;
1331 }
1332
1333 /* console_lock is held */
1334 static void csi_m(struct vc_data *vc)
1335 {
1336         int i;
1337
1338         for (i = 0; i <= vc->vc_npar; i++)
1339                 switch (vc->vc_par[i]) {
1340                 case 0: /* all attributes off */
1341                         default_attr(vc);
1342                         break;
1343                 case 1:
1344                         vc->vc_intensity = 2;
1345                         break;
1346                 case 2:
1347                         vc->vc_intensity = 0;
1348                         break;
1349                 case 3:
1350                         vc->vc_italic = 1;
1351                         break;
1352                 case 4:
1353                         vc->vc_underline = 1;
1354                         break;
1355                 case 5:
1356                         vc->vc_blink = 1;
1357                         break;
1358                 case 7:
1359                         vc->vc_reverse = 1;
1360                         break;
1361                 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1362                           * Select primary font, don't display control chars if
1363                           * defined, don't set bit 8 on output.
1364                           */
1365                         vc->vc_translate = set_translate(vc->vc_charset == 0
1366                                         ? vc->vc_G0_charset
1367                                         : vc->vc_G1_charset, vc);
1368                         vc->vc_disp_ctrl = 0;
1369                         vc->vc_toggle_meta = 0;
1370                         break;
1371                 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1372                           * Select first alternate font, lets chars < 32 be
1373                           * displayed as ROM chars.
1374                           */
1375                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1376                         vc->vc_disp_ctrl = 1;
1377                         vc->vc_toggle_meta = 0;
1378                         break;
1379                 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1380                           * Select second alternate font, toggle high bit
1381                           * before displaying as ROM char.
1382                           */
1383                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1384                         vc->vc_disp_ctrl = 1;
1385                         vc->vc_toggle_meta = 1;
1386                         break;
1387                 case 21:
1388                 case 22:
1389                         vc->vc_intensity = 1;
1390                         break;
1391                 case 23:
1392                         vc->vc_italic = 0;
1393                         break;
1394                 case 24:
1395                         vc->vc_underline = 0;
1396                         break;
1397                 case 25:
1398                         vc->vc_blink = 0;
1399                         break;
1400                 case 27:
1401                         vc->vc_reverse = 0;
1402                         break;
1403                 case 38:
1404                         i = vc_t416_color(vc, i, rgb_foreground);
1405                         break;
1406                 case 48:
1407                         i = vc_t416_color(vc, i, rgb_background);
1408                         break;
1409                 case 39:
1410                         vc->vc_color = (vc->vc_def_color & 0x0f) |
1411                                 (vc->vc_color & 0xf0);
1412                         break;
1413                 case 49:
1414                         vc->vc_color = (vc->vc_def_color & 0xf0) |
1415                                 (vc->vc_color & 0x0f);
1416                         break;
1417                 default:
1418                         if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1419                                 vc->vc_color = color_table[vc->vc_par[i] - 30]
1420                                         | (vc->vc_color & 0xf0);
1421                         else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1422                                 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1423                                         | (vc->vc_color & 0x0f);
1424                         break;
1425                 }
1426         update_attr(vc);
1427 }
1428
1429 static void respond_string(const char *p, struct tty_port *port)
1430 {
1431         while (*p) {
1432                 tty_insert_flip_char(port, *p, 0);
1433                 p++;
1434         }
1435         tty_schedule_flip(port);
1436 }
1437
1438 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1439 {
1440         char buf[40];
1441
1442         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1443         respond_string(buf, tty->port);
1444 }
1445
1446 static inline void status_report(struct tty_struct *tty)
1447 {
1448         respond_string("\033[0n", tty->port);   /* Terminal ok */
1449 }
1450
1451 static inline void respond_ID(struct tty_struct *tty)
1452 {
1453         respond_string(VT102ID, tty->port);
1454 }
1455
1456 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1457 {
1458         char buf[8];
1459
1460         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1461                 (char)('!' + mry));
1462         respond_string(buf, tty->port);
1463 }
1464
1465 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1466 int mouse_reporting(void)
1467 {
1468         return vc_cons[fg_console].d->vc_report_mouse;
1469 }
1470
1471 /* console_lock is held */
1472 static void set_mode(struct vc_data *vc, int on_off)
1473 {
1474         int i;
1475
1476         for (i = 0; i <= vc->vc_npar; i++)
1477                 if (vc->vc_ques) {
1478                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1479                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1480                                 if (on_off)
1481                                         set_kbd(vc, decckm);
1482                                 else
1483                                         clr_kbd(vc, decckm);
1484                                 break;
1485                         case 3: /* 80/132 mode switch unimplemented */
1486 #if 0
1487                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1488                                 /* this alone does not suffice; some user mode
1489                                    utility has to change the hardware regs */
1490 #endif
1491                                 break;
1492                         case 5:                 /* Inverted screen on/off */
1493                                 if (vc->vc_decscnm != on_off) {
1494                                         vc->vc_decscnm = on_off;
1495                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1496                                         update_attr(vc);
1497                                 }
1498                                 break;
1499                         case 6:                 /* Origin relative/absolute */
1500                                 vc->vc_decom = on_off;
1501                                 gotoxay(vc, 0, 0);
1502                                 break;
1503                         case 7:                 /* Autowrap on/off */
1504                                 vc->vc_decawm = on_off;
1505                                 break;
1506                         case 8:                 /* Autorepeat on/off */
1507                                 if (on_off)
1508                                         set_kbd(vc, decarm);
1509                                 else
1510                                         clr_kbd(vc, decarm);
1511                                 break;
1512                         case 9:
1513                                 vc->vc_report_mouse = on_off ? 1 : 0;
1514                                 break;
1515                         case 25:                /* Cursor on/off */
1516                                 vc->vc_deccm = on_off;
1517                                 break;
1518                         case 1000:
1519                                 vc->vc_report_mouse = on_off ? 2 : 0;
1520                                 break;
1521                         }
1522                 } else {
1523                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1524                         case 3:                 /* Monitor (display ctrls) */
1525                                 vc->vc_disp_ctrl = on_off;
1526                                 break;
1527                         case 4:                 /* Insert Mode on/off */
1528                                 vc->vc_decim = on_off;
1529                                 break;
1530                         case 20:                /* Lf, Enter == CrLf/Lf */
1531                                 if (on_off)
1532                                         set_kbd(vc, lnm);
1533                                 else
1534                                         clr_kbd(vc, lnm);
1535                                 break;
1536                         }
1537                 }
1538 }
1539
1540 /* console_lock is held */
1541 static void setterm_command(struct vc_data *vc)
1542 {
1543         switch(vc->vc_par[0]) {
1544                 case 1: /* set color for underline mode */
1545                         if (vc->vc_can_do_color &&
1546                                         vc->vc_par[1] < 16) {
1547                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1548                                 if (vc->vc_underline)
1549                                         update_attr(vc);
1550                         }
1551                         break;
1552                 case 2: /* set color for half intensity mode */
1553                         if (vc->vc_can_do_color &&
1554                                         vc->vc_par[1] < 16) {
1555                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1556                                 if (vc->vc_intensity == 0)
1557                                         update_attr(vc);
1558                         }
1559                         break;
1560                 case 8: /* store colors as defaults */
1561                         vc->vc_def_color = vc->vc_attr;
1562                         if (vc->vc_hi_font_mask == 0x100)
1563                                 vc->vc_def_color >>= 1;
1564                         default_attr(vc);
1565                         update_attr(vc);
1566                         break;
1567                 case 9: /* set blanking interval */
1568                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1569                         poke_blanked_console();
1570                         break;
1571                 case 10: /* set bell frequency in Hz */
1572                         if (vc->vc_npar >= 1)
1573                                 vc->vc_bell_pitch = vc->vc_par[1];
1574                         else
1575                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1576                         break;
1577                 case 11: /* set bell duration in msec */
1578                         if (vc->vc_npar >= 1)
1579                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1580                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1581                         else
1582                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1583                         break;
1584                 case 12: /* bring specified console to the front */
1585                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1586                                 set_console(vc->vc_par[1] - 1);
1587                         break;
1588                 case 13: /* unblank the screen */
1589                         poke_blanked_console();
1590                         break;
1591                 case 14: /* set vesa powerdown interval */
1592                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1593                         break;
1594                 case 15: /* activate the previous console */
1595                         set_console(last_console);
1596                         break;
1597                 case 16: /* set cursor blink duration in msec */
1598                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1599                                         vc->vc_par[1] <= USHRT_MAX)
1600                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1601                         else
1602                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1603                         break;
1604         }
1605 }
1606
1607 /* console_lock is held */
1608 static void csi_at(struct vc_data *vc, unsigned int nr)
1609 {
1610         if (nr > vc->vc_cols - vc->vc_x)
1611                 nr = vc->vc_cols - vc->vc_x;
1612         else if (!nr)
1613                 nr = 1;
1614         insert_char(vc, nr);
1615 }
1616
1617 /* console_lock is held */
1618 static void csi_L(struct vc_data *vc, unsigned int nr)
1619 {
1620         if (nr > vc->vc_rows - vc->vc_y)
1621                 nr = vc->vc_rows - vc->vc_y;
1622         else if (!nr)
1623                 nr = 1;
1624         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1625         vc->vc_need_wrap = 0;
1626 }
1627
1628 /* console_lock is held */
1629 static void csi_P(struct vc_data *vc, unsigned int nr)
1630 {
1631         if (nr > vc->vc_cols - vc->vc_x)
1632                 nr = vc->vc_cols - vc->vc_x;
1633         else if (!nr)
1634                 nr = 1;
1635         delete_char(vc, nr);
1636 }
1637
1638 /* console_lock is held */
1639 static void csi_M(struct vc_data *vc, unsigned int nr)
1640 {
1641         if (nr > vc->vc_rows - vc->vc_y)
1642                 nr = vc->vc_rows - vc->vc_y;
1643         else if (!nr)
1644                 nr=1;
1645         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1646         vc->vc_need_wrap = 0;
1647 }
1648
1649 /* console_lock is held (except via vc_init->reset_terminal */
1650 static void save_cur(struct vc_data *vc)
1651 {
1652         vc->vc_saved_x          = vc->vc_x;
1653         vc->vc_saved_y          = vc->vc_y;
1654         vc->vc_s_intensity      = vc->vc_intensity;
1655         vc->vc_s_italic         = vc->vc_italic;
1656         vc->vc_s_underline      = vc->vc_underline;
1657         vc->vc_s_blink          = vc->vc_blink;
1658         vc->vc_s_reverse        = vc->vc_reverse;
1659         vc->vc_s_charset        = vc->vc_charset;
1660         vc->vc_s_color          = vc->vc_color;
1661         vc->vc_saved_G0         = vc->vc_G0_charset;
1662         vc->vc_saved_G1         = vc->vc_G1_charset;
1663 }
1664
1665 /* console_lock is held */
1666 static void restore_cur(struct vc_data *vc)
1667 {
1668         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1669         vc->vc_intensity        = vc->vc_s_intensity;
1670         vc->vc_italic           = vc->vc_s_italic;
1671         vc->vc_underline        = vc->vc_s_underline;
1672         vc->vc_blink            = vc->vc_s_blink;
1673         vc->vc_reverse          = vc->vc_s_reverse;
1674         vc->vc_charset          = vc->vc_s_charset;
1675         vc->vc_color            = vc->vc_s_color;
1676         vc->vc_G0_charset       = vc->vc_saved_G0;
1677         vc->vc_G1_charset       = vc->vc_saved_G1;
1678         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1679         update_attr(vc);
1680         vc->vc_need_wrap = 0;
1681 }
1682
1683 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1684         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1685         ESpalette, ESosc };
1686
1687 /* console_lock is held (except via vc_init()) */
1688 static void reset_terminal(struct vc_data *vc, int do_clear)
1689 {
1690         vc->vc_top              = 0;
1691         vc->vc_bottom           = vc->vc_rows;
1692         vc->vc_state            = ESnormal;
1693         vc->vc_ques             = 0;
1694         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1695         vc->vc_G0_charset       = LAT1_MAP;
1696         vc->vc_G1_charset       = GRAF_MAP;
1697         vc->vc_charset          = 0;
1698         vc->vc_need_wrap        = 0;
1699         vc->vc_report_mouse     = 0;
1700         vc->vc_utf              = default_utf8;
1701         vc->vc_utf_count        = 0;
1702
1703         vc->vc_disp_ctrl        = 0;
1704         vc->vc_toggle_meta      = 0;
1705
1706         vc->vc_decscnm          = 0;
1707         vc->vc_decom            = 0;
1708         vc->vc_decawm           = 1;
1709         vc->vc_deccm            = global_cursor_default;
1710         vc->vc_decim            = 0;
1711
1712         vt_reset_keyboard(vc->vc_num);
1713
1714         vc->vc_cursor_type = cur_default;
1715         vc->vc_complement_mask = vc->vc_s_complement_mask;
1716
1717         default_attr(vc);
1718         update_attr(vc);
1719
1720         vc->vc_tab_stop[0]      = 0x01010100;
1721         vc->vc_tab_stop[1]      =
1722         vc->vc_tab_stop[2]      =
1723         vc->vc_tab_stop[3]      =
1724         vc->vc_tab_stop[4]      =
1725         vc->vc_tab_stop[5]      =
1726         vc->vc_tab_stop[6]      =
1727         vc->vc_tab_stop[7]      = 0x01010101;
1728
1729         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1730         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1731         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1732
1733         gotoxy(vc, 0, 0);
1734         save_cur(vc);
1735         if (do_clear)
1736             csi_J(vc, 2);
1737 }
1738
1739 /* console_lock is held */
1740 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1741 {
1742         /*
1743          *  Control characters can be used in the _middle_
1744          *  of an escape sequence.
1745          */
1746         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1747                 return;
1748         switch (c) {
1749         case 0:
1750                 return;
1751         case 7:
1752                 if (vc->vc_state == ESosc)
1753                         vc->vc_state = ESnormal;
1754                 else if (vc->vc_bell_duration)
1755                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1756                 return;
1757         case 8:
1758                 bs(vc);
1759                 return;
1760         case 9:
1761                 vc->vc_pos -= (vc->vc_x << 1);
1762                 while (vc->vc_x < vc->vc_cols - 1) {
1763                         vc->vc_x++;
1764                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1765                                 break;
1766                 }
1767                 vc->vc_pos += (vc->vc_x << 1);
1768                 notify_write(vc, '\t');
1769                 return;
1770         case 10: case 11: case 12:
1771                 lf(vc);
1772                 if (!is_kbd(vc, lnm))
1773                         return;
1774         case 13:
1775                 cr(vc);
1776                 return;
1777         case 14:
1778                 vc->vc_charset = 1;
1779                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1780                 vc->vc_disp_ctrl = 1;
1781                 return;
1782         case 15:
1783                 vc->vc_charset = 0;
1784                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1785                 vc->vc_disp_ctrl = 0;
1786                 return;
1787         case 24: case 26:
1788                 vc->vc_state = ESnormal;
1789                 return;
1790         case 27:
1791                 vc->vc_state = ESesc;
1792                 return;
1793         case 127:
1794                 del(vc);
1795                 return;
1796         case 128+27:
1797                 vc->vc_state = ESsquare;
1798                 return;
1799         }
1800         switch(vc->vc_state) {
1801         case ESesc:
1802                 vc->vc_state = ESnormal;
1803                 switch (c) {
1804                 case '[':
1805                         vc->vc_state = ESsquare;
1806                         return;
1807                 case ']':
1808                         vc->vc_state = ESnonstd;
1809                         return;
1810                 case '%':
1811                         vc->vc_state = ESpercent;
1812                         return;
1813                 case 'E':
1814                         cr(vc);
1815                         lf(vc);
1816                         return;
1817                 case 'M':
1818                         ri(vc);
1819                         return;
1820                 case 'D':
1821                         lf(vc);
1822                         return;
1823                 case 'H':
1824                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1825                         return;
1826                 case 'Z':
1827                         respond_ID(tty);
1828                         return;
1829                 case '7':
1830                         save_cur(vc);
1831                         return;
1832                 case '8':
1833                         restore_cur(vc);
1834                         return;
1835                 case '(':
1836                         vc->vc_state = ESsetG0;
1837                         return;
1838                 case ')':
1839                         vc->vc_state = ESsetG1;
1840                         return;
1841                 case '#':
1842                         vc->vc_state = EShash;
1843                         return;
1844                 case 'c':
1845                         reset_terminal(vc, 1);
1846                         return;
1847                 case '>':  /* Numeric keypad */
1848                         clr_kbd(vc, kbdapplic);
1849                         return;
1850                 case '=':  /* Appl. keypad */
1851                         set_kbd(vc, kbdapplic);
1852                         return;
1853                 }
1854                 return;
1855         case ESnonstd:
1856                 if (c=='P') {   /* palette escape sequence */
1857                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1858                                 vc->vc_par[vc->vc_npar] = 0;
1859                         vc->vc_npar = 0;
1860                         vc->vc_state = ESpalette;
1861                         return;
1862                 } else if (c=='R') {   /* reset palette */
1863                         reset_palette(vc);
1864                         vc->vc_state = ESnormal;
1865                 } else if (c>='0' && c<='9')
1866                         vc->vc_state = ESosc;
1867                 else
1868                         vc->vc_state = ESnormal;
1869                 return;
1870         case ESpalette:
1871                 if (isxdigit(c)) {
1872                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1873                         if (vc->vc_npar == 7) {
1874                                 int i = vc->vc_par[0] * 3, j = 1;
1875                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1876                                 vc->vc_palette[i++] += vc->vc_par[j++];
1877                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1878                                 vc->vc_palette[i++] += vc->vc_par[j++];
1879                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1880                                 vc->vc_palette[i] += vc->vc_par[j];
1881                                 set_palette(vc);
1882                                 vc->vc_state = ESnormal;
1883                         }
1884                 } else
1885                         vc->vc_state = ESnormal;
1886                 return;
1887         case ESsquare:
1888                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1889                         vc->vc_par[vc->vc_npar] = 0;
1890                 vc->vc_npar = 0;
1891                 vc->vc_state = ESgetpars;
1892                 if (c == '[') { /* Function key */
1893                         vc->vc_state=ESfunckey;
1894                         return;
1895                 }
1896                 vc->vc_ques = (c == '?');
1897                 if (vc->vc_ques)
1898                         return;
1899         case ESgetpars:
1900                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1901                         vc->vc_npar++;
1902                         return;
1903                 } else if (c>='0' && c<='9') {
1904                         vc->vc_par[vc->vc_npar] *= 10;
1905                         vc->vc_par[vc->vc_npar] += c - '0';
1906                         return;
1907                 }
1908                 vc->vc_state = ESnormal;
1909                 switch(c) {
1910                 case 'h':
1911                         set_mode(vc, 1);
1912                         return;
1913                 case 'l':
1914                         set_mode(vc, 0);
1915                         return;
1916                 case 'c':
1917                         if (vc->vc_ques) {
1918                                 if (vc->vc_par[0])
1919                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1920                                 else
1921                                         vc->vc_cursor_type = cur_default;
1922                                 return;
1923                         }
1924                         break;
1925                 case 'm':
1926                         if (vc->vc_ques) {
1927                                 clear_selection();
1928                                 if (vc->vc_par[0])
1929                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1930                                 else
1931                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1932                                 return;
1933                         }
1934                         break;
1935                 case 'n':
1936                         if (!vc->vc_ques) {
1937                                 if (vc->vc_par[0] == 5)
1938                                         status_report(tty);
1939                                 else if (vc->vc_par[0] == 6)
1940                                         cursor_report(vc, tty);
1941                         }
1942                         return;
1943                 }
1944                 if (vc->vc_ques) {
1945                         vc->vc_ques = 0;
1946                         return;
1947                 }
1948                 switch(c) {
1949                 case 'G': case '`':
1950                         if (vc->vc_par[0])
1951                                 vc->vc_par[0]--;
1952                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1953                         return;
1954                 case 'A':
1955                         if (!vc->vc_par[0])
1956                                 vc->vc_par[0]++;
1957                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1958                         return;
1959                 case 'B': case 'e':
1960                         if (!vc->vc_par[0])
1961                                 vc->vc_par[0]++;
1962                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1963                         return;
1964                 case 'C': case 'a':
1965                         if (!vc->vc_par[0])
1966                                 vc->vc_par[0]++;
1967                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1968                         return;
1969                 case 'D':
1970                         if (!vc->vc_par[0])
1971                                 vc->vc_par[0]++;
1972                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1973                         return;
1974                 case 'E':
1975                         if (!vc->vc_par[0])
1976                                 vc->vc_par[0]++;
1977                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1978                         return;
1979                 case 'F':
1980                         if (!vc->vc_par[0])
1981                                 vc->vc_par[0]++;
1982                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1983                         return;
1984                 case 'd':
1985                         if (vc->vc_par[0])
1986                                 vc->vc_par[0]--;
1987                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1988                         return;
1989                 case 'H': case 'f':
1990                         if (vc->vc_par[0])
1991                                 vc->vc_par[0]--;
1992                         if (vc->vc_par[1])
1993                                 vc->vc_par[1]--;
1994                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1995                         return;
1996                 case 'J':
1997                         csi_J(vc, vc->vc_par[0]);
1998                         return;
1999                 case 'K':
2000                         csi_K(vc, vc->vc_par[0]);
2001                         return;
2002                 case 'L':
2003                         csi_L(vc, vc->vc_par[0]);
2004                         return;
2005                 case 'M':
2006                         csi_M(vc, vc->vc_par[0]);
2007                         return;
2008                 case 'P':
2009                         csi_P(vc, vc->vc_par[0]);
2010                         return;
2011                 case 'c':
2012                         if (!vc->vc_par[0])
2013                                 respond_ID(tty);
2014                         return;
2015                 case 'g':
2016                         if (!vc->vc_par[0])
2017                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2018                         else if (vc->vc_par[0] == 3) {
2019                                 vc->vc_tab_stop[0] =
2020                                         vc->vc_tab_stop[1] =
2021                                         vc->vc_tab_stop[2] =
2022                                         vc->vc_tab_stop[3] =
2023                                         vc->vc_tab_stop[4] =
2024                                         vc->vc_tab_stop[5] =
2025                                         vc->vc_tab_stop[6] =
2026                                         vc->vc_tab_stop[7] = 0;
2027                         }
2028                         return;
2029                 case 'm':
2030                         csi_m(vc);
2031                         return;
2032                 case 'q': /* DECLL - but only 3 leds */
2033                         /* map 0,1,2,3 to 0,1,2,4 */
2034                         if (vc->vc_par[0] < 4)
2035                                 vt_set_led_state(vc->vc_num,
2036                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2037                         return;
2038                 case 'r':
2039                         if (!vc->vc_par[0])
2040                                 vc->vc_par[0]++;
2041                         if (!vc->vc_par[1])
2042                                 vc->vc_par[1] = vc->vc_rows;
2043                         /* Minimum allowed region is 2 lines */
2044                         if (vc->vc_par[0] < vc->vc_par[1] &&
2045                             vc->vc_par[1] <= vc->vc_rows) {
2046                                 vc->vc_top = vc->vc_par[0] - 1;
2047                                 vc->vc_bottom = vc->vc_par[1];
2048                                 gotoxay(vc, 0, 0);
2049                         }
2050                         return;
2051                 case 's':
2052                         save_cur(vc);
2053                         return;
2054                 case 'u':
2055                         restore_cur(vc);
2056                         return;
2057                 case 'X':
2058                         csi_X(vc, vc->vc_par[0]);
2059                         return;
2060                 case '@':
2061                         csi_at(vc, vc->vc_par[0]);
2062                         return;
2063                 case ']': /* setterm functions */
2064                         setterm_command(vc);
2065                         return;
2066                 }
2067                 return;
2068         case ESpercent:
2069                 vc->vc_state = ESnormal;
2070                 switch (c) {
2071                 case '@':  /* defined in ISO 2022 */
2072                         vc->vc_utf = 0;
2073                         return;
2074                 case 'G':  /* prelim official escape code */
2075                 case '8':  /* retained for compatibility */
2076                         vc->vc_utf = 1;
2077                         return;
2078                 }
2079                 return;
2080         case ESfunckey:
2081                 vc->vc_state = ESnormal;
2082                 return;
2083         case EShash:
2084                 vc->vc_state = ESnormal;
2085                 if (c == '8') {
2086                         /* DEC screen alignment test. kludge :-) */
2087                         vc->vc_video_erase_char =
2088                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2089                         csi_J(vc, 2);
2090                         vc->vc_video_erase_char =
2091                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2092                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2093                 }
2094                 return;
2095         case ESsetG0:
2096                 if (c == '0')
2097                         vc->vc_G0_charset = GRAF_MAP;
2098                 else if (c == 'B')
2099                         vc->vc_G0_charset = LAT1_MAP;
2100                 else if (c == 'U')
2101                         vc->vc_G0_charset = IBMPC_MAP;
2102                 else if (c == 'K')
2103                         vc->vc_G0_charset = USER_MAP;
2104                 if (vc->vc_charset == 0)
2105                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2106                 vc->vc_state = ESnormal;
2107                 return;
2108         case ESsetG1:
2109                 if (c == '0')
2110                         vc->vc_G1_charset = GRAF_MAP;
2111                 else if (c == 'B')
2112                         vc->vc_G1_charset = LAT1_MAP;
2113                 else if (c == 'U')
2114                         vc->vc_G1_charset = IBMPC_MAP;
2115                 else if (c == 'K')
2116                         vc->vc_G1_charset = USER_MAP;
2117                 if (vc->vc_charset == 1)
2118                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2119                 vc->vc_state = ESnormal;
2120                 return;
2121         case ESosc:
2122                 return;
2123         default:
2124                 vc->vc_state = ESnormal;
2125         }
2126 }
2127
2128 /* is_double_width() is based on the wcwidth() implementation by
2129  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2130  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2131  */
2132 struct interval {
2133         uint32_t first;
2134         uint32_t last;
2135 };
2136
2137 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2138 {
2139         int min = 0;
2140         int mid;
2141
2142         if (ucs < table[0].first || ucs > table[max].last)
2143                 return 0;
2144         while (max >= min) {
2145                 mid = (min + max) / 2;
2146                 if (ucs > table[mid].last)
2147                         min = mid + 1;
2148                 else if (ucs < table[mid].first)
2149                         max = mid - 1;
2150                 else
2151                         return 1;
2152         }
2153         return 0;
2154 }
2155
2156 static int is_double_width(uint32_t ucs)
2157 {
2158         static const struct interval double_width[] = {
2159                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2160                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2161                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2162                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2163         };
2164         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2165 }
2166
2167 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2168                 unsigned long draw_to, int *draw_x)
2169 {
2170         if (*draw_x < 0)
2171                 return;
2172
2173         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2174                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2175         *draw_x = -1;
2176 }
2177
2178 /* acquires console_lock */
2179 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2180 {
2181         int c, tc, ok, n = 0, draw_x = -1;
2182         unsigned int currcons;
2183         unsigned long draw_from = 0, draw_to = 0;
2184         struct vc_data *vc;
2185         unsigned char vc_attr;
2186         struct vt_notifier_param param;
2187         uint8_t rescan;
2188         uint8_t inverse;
2189         uint8_t width;
2190         u16 himask, charmask;
2191
2192         if (in_interrupt())
2193                 return count;
2194
2195         might_sleep();
2196
2197         console_lock();
2198         vc = tty->driver_data;
2199         if (vc == NULL) {
2200                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2201                 console_unlock();
2202                 return 0;
2203         }
2204
2205         currcons = vc->vc_num;
2206         if (!vc_cons_allocated(currcons)) {
2207                 /* could this happen? */
2208                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2209                 console_unlock();
2210                 return 0;
2211         }
2212
2213         himask = vc->vc_hi_font_mask;
2214         charmask = himask ? 0x1ff : 0xff;
2215
2216         /* undraw cursor first */
2217         if (con_is_fg(vc))
2218                 hide_cursor(vc);
2219
2220         param.vc = vc;
2221
2222         while (!tty->stopped && count) {
2223                 int orig = *buf;
2224                 c = orig;
2225                 buf++;
2226                 n++;
2227                 count--;
2228                 rescan = 0;
2229                 inverse = 0;
2230                 width = 1;
2231
2232                 /* Do no translation at all in control states */
2233                 if (vc->vc_state != ESnormal) {
2234                         tc = c;
2235                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2236                     /* Combine UTF-8 into Unicode in vc_utf_char.
2237                      * vc_utf_count is the number of continuation bytes still
2238                      * expected to arrive.
2239                      * vc_npar is the number of continuation bytes arrived so
2240                      * far
2241                      */
2242 rescan_last_byte:
2243                     if ((c & 0xc0) == 0x80) {
2244                         /* Continuation byte received */
2245                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2246                         if (vc->vc_utf_count) {
2247                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2248                             vc->vc_npar++;
2249                             if (--vc->vc_utf_count) {
2250                                 /* Still need some bytes */
2251                                 continue;
2252                             }
2253                             /* Got a whole character */
2254                             c = vc->vc_utf_char;
2255                             /* Reject overlong sequences */
2256                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2257                                         c > utf8_length_changes[vc->vc_npar])
2258                                 c = 0xfffd;
2259                         } else {
2260                             /* Unexpected continuation byte */
2261                             vc->vc_utf_count = 0;
2262                             c = 0xfffd;
2263                         }
2264                     } else {
2265                         /* Single ASCII byte or first byte of a sequence received */
2266                         if (vc->vc_utf_count) {
2267                             /* Continuation byte expected */
2268                             rescan = 1;
2269                             vc->vc_utf_count = 0;
2270                             c = 0xfffd;
2271                         } else if (c > 0x7f) {
2272                             /* First byte of a multibyte sequence received */
2273                             vc->vc_npar = 0;
2274                             if ((c & 0xe0) == 0xc0) {
2275                                 vc->vc_utf_count = 1;
2276                                 vc->vc_utf_char = (c & 0x1f);
2277                             } else if ((c & 0xf0) == 0xe0) {
2278                                 vc->vc_utf_count = 2;
2279                                 vc->vc_utf_char = (c & 0x0f);
2280                             } else if ((c & 0xf8) == 0xf0) {
2281                                 vc->vc_utf_count = 3;
2282                                 vc->vc_utf_char = (c & 0x07);
2283                             } else if ((c & 0xfc) == 0xf8) {
2284                                 vc->vc_utf_count = 4;
2285                                 vc->vc_utf_char = (c & 0x03);
2286                             } else if ((c & 0xfe) == 0xfc) {
2287                                 vc->vc_utf_count = 5;
2288                                 vc->vc_utf_char = (c & 0x01);
2289                             } else {
2290                                 /* 254 and 255 are invalid */
2291                                 c = 0xfffd;
2292                             }
2293                             if (vc->vc_utf_count) {
2294                                 /* Still need some bytes */
2295                                 continue;
2296                             }
2297                         }
2298                         /* Nothing to do if an ASCII byte was received */
2299                     }
2300                     /* End of UTF-8 decoding. */
2301                     /* c is the received character, or U+FFFD for invalid sequences. */
2302                     /* Replace invalid Unicode code points with U+FFFD too */
2303                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2304                         c = 0xfffd;
2305                     tc = c;
2306                 } else {        /* no utf or alternate charset mode */
2307                     tc = vc_translate(vc, c);
2308                 }
2309
2310                 param.c = tc;
2311                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2312                                         &param) == NOTIFY_STOP)
2313                         continue;
2314
2315                 /* If the original code was a control character we
2316                  * only allow a glyph to be displayed if the code is
2317                  * not normally used (such as for cursor movement) or
2318                  * if the disp_ctrl mode has been explicitly enabled.
2319                  * Certain characters (as given by the CTRL_ALWAYS
2320                  * bitmap) are always displayed as control characters,
2321                  * as the console would be pretty useless without
2322                  * them; to display an arbitrary font position use the
2323                  * direct-to-font zone in UTF-8 mode.
2324                  */
2325                 ok = tc && (c >= 32 ||
2326                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2327                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2328                         && (c != 127 || vc->vc_disp_ctrl)
2329                         && (c != 128+27);
2330
2331                 if (vc->vc_state == ESnormal && ok) {
2332                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2333                                 if (is_double_width(c))
2334                                         width = 2;
2335                         }
2336                         /* Now try to find out how to display it */
2337                         tc = conv_uni_to_pc(vc, tc);
2338                         if (tc & ~charmask) {
2339                                 if (tc == -1 || tc == -2) {
2340                                     continue; /* nothing to display */
2341                                 }
2342                                 /* Glyph not found */
2343                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2344                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2345                                        This would make absolutely no sense with Unicode in mind,
2346                                        but do this for ASCII characters since a font may lack
2347                                        Unicode mapping info and we don't want to end up with
2348                                        having question marks only. */
2349                                     tc = c;
2350                                 } else {
2351                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2352                                     tc = conv_uni_to_pc(vc, 0xfffd);
2353                                     if (tc < 0) {
2354                                         inverse = 1;
2355                                         tc = conv_uni_to_pc(vc, '?');
2356                                         if (tc < 0) tc = '?';
2357                                     }
2358                                 }
2359                         }
2360
2361                         if (!inverse) {
2362                                 vc_attr = vc->vc_attr;
2363                         } else {
2364                                 /* invert vc_attr */
2365                                 if (!vc->vc_can_do_color) {
2366                                         vc_attr = (vc->vc_attr) ^ 0x08;
2367                                 } else if (vc->vc_hi_font_mask == 0x100) {
2368                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2369                                 } else {
2370                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2371                                 }
2372                                 con_flush(vc, draw_from, draw_to, &draw_x);
2373                         }
2374
2375                         while (1) {
2376                                 if (vc->vc_need_wrap || vc->vc_decim)
2377                                         con_flush(vc, draw_from, draw_to,
2378                                                         &draw_x);
2379                                 if (vc->vc_need_wrap) {
2380                                         cr(vc);
2381                                         lf(vc);
2382                                 }
2383                                 if (vc->vc_decim)
2384                                         insert_char(vc, 1);
2385                                 scr_writew(himask ?
2386                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2387                                              (vc_attr << 8) + tc,
2388                                            (u16 *) vc->vc_pos);
2389                                 if (con_should_update(vc) && draw_x < 0) {
2390                                         draw_x = vc->vc_x;
2391                                         draw_from = vc->vc_pos;
2392                                 }
2393                                 if (vc->vc_x == vc->vc_cols - 1) {
2394                                         vc->vc_need_wrap = vc->vc_decawm;
2395                                         draw_to = vc->vc_pos + 2;
2396                                 } else {
2397                                         vc->vc_x++;
2398                                         draw_to = (vc->vc_pos += 2);
2399                                 }
2400
2401                                 if (!--width) break;
2402
2403                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2404                                 if (tc < 0) tc = ' ';
2405                         }
2406                         notify_write(vc, c);
2407
2408                         if (inverse)
2409                                 con_flush(vc, draw_from, draw_to, &draw_x);
2410
2411                         if (rescan) {
2412                                 rescan = 0;
2413                                 inverse = 0;
2414                                 width = 1;
2415                                 c = orig;
2416                                 goto rescan_last_byte;
2417                         }
2418                         continue;
2419                 }
2420                 con_flush(vc, draw_from, draw_to, &draw_x);
2421                 do_con_trol(tty, vc, orig);
2422         }
2423         con_flush(vc, draw_from, draw_to, &draw_x);
2424         console_conditional_schedule();
2425         console_unlock();
2426         notify_update(vc);
2427         return n;
2428 }
2429
2430 /*
2431  * This is the console switching callback.
2432  *
2433  * Doing console switching in a process context allows
2434  * us to do the switches asynchronously (needed when we want
2435  * to switch due to a keyboard interrupt).  Synchronization
2436  * with other console code and prevention of re-entrancy is
2437  * ensured with console_lock.
2438  */
2439 static void console_callback(struct work_struct *ignored)
2440 {
2441         console_lock();
2442
2443         if (want_console >= 0) {
2444                 if (want_console != fg_console &&
2445                     vc_cons_allocated(want_console)) {
2446                         hide_cursor(vc_cons[fg_console].d);
2447                         change_console(vc_cons[want_console].d);
2448                         /* we only changed when the console had already
2449                            been allocated - a new console is not created
2450                            in an interrupt routine */
2451                 }
2452                 want_console = -1;
2453         }
2454         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2455                 do_poke_blanked_console = 0;
2456                 poke_blanked_console();
2457         }
2458         if (scrollback_delta) {
2459                 struct vc_data *vc = vc_cons[fg_console].d;
2460                 clear_selection();
2461                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2462                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2463                 scrollback_delta = 0;
2464         }
2465         if (blank_timer_expired) {
2466                 do_blank_screen(0);
2467                 blank_timer_expired = 0;
2468         }
2469         notify_update(vc_cons[fg_console].d);
2470
2471         console_unlock();
2472 }
2473
2474 int set_console(int nr)
2475 {
2476         struct vc_data *vc = vc_cons[fg_console].d;
2477
2478         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2479                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2480
2481                 /*
2482                  * Console switch will fail in console_callback() or
2483                  * change_console() so there is no point scheduling
2484                  * the callback
2485                  *
2486                  * Existing set_console() users don't check the return
2487                  * value so this shouldn't break anything
2488                  */
2489                 return -EINVAL;
2490         }
2491
2492         want_console = nr;
2493         schedule_console_callback();
2494
2495         return 0;
2496 }
2497
2498 struct tty_driver *console_driver;
2499
2500 #ifdef CONFIG_VT_CONSOLE
2501
2502 /**
2503  * vt_kmsg_redirect() - Sets/gets the kernel message console
2504  * @new:        The new virtual terminal number or -1 if the console should stay
2505  *              unchanged
2506  *
2507  * By default, the kernel messages are always printed on the current virtual
2508  * console. However, the user may modify that default with the
2509  * TIOCL_SETKMSGREDIRECT ioctl call.
2510  *
2511  * This function sets the kernel message console to be @new. It returns the old
2512  * virtual console number. The virtual terminal number 0 (both as parameter and
2513  * return value) means no redirection (i.e. always printed on the currently
2514  * active console).
2515  *
2516  * The parameter -1 means that only the current console is returned, but the
2517  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2518  * case to make the code more understandable.
2519  *
2520  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2521  * the parameter and always returns 0.
2522  */
2523 int vt_kmsg_redirect(int new)
2524 {
2525         static int kmsg_con;
2526
2527         if (new != -1)
2528                 return xchg(&kmsg_con, new);
2529         else
2530                 return kmsg_con;
2531 }
2532
2533 /*
2534  *      Console on virtual terminal
2535  *
2536  * The console must be locked when we get here.
2537  */
2538
2539 static void vt_console_print(struct console *co, const char *b, unsigned count)
2540 {
2541         struct vc_data *vc = vc_cons[fg_console].d;
2542         unsigned char c;
2543         static DEFINE_SPINLOCK(printing_lock);
2544         const ushort *start;
2545         ushort cnt = 0;
2546         ushort myx;
2547         int kmsg_console;
2548
2549         /* console busy or not yet initialized */
2550         if (!printable)
2551                 return;
2552         if (!spin_trylock(&printing_lock))
2553                 return;
2554
2555         kmsg_console = vt_get_kmsg_redirect();
2556         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2557                 vc = vc_cons[kmsg_console - 1].d;
2558
2559         /* read `x' only after setting currcons properly (otherwise
2560            the `x' macro will read the x of the foreground console). */
2561         myx = vc->vc_x;
2562
2563         if (!vc_cons_allocated(fg_console)) {
2564                 /* impossible */
2565                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2566                 goto quit;
2567         }
2568
2569         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2570                 goto quit;
2571
2572         /* undraw cursor first */
2573         if (con_is_fg(vc))
2574                 hide_cursor(vc);
2575
2576         start = (ushort *)vc->vc_pos;
2577
2578         /* Contrived structure to try to emulate original need_wrap behaviour
2579          * Problems caused when we have need_wrap set on '\n' character */
2580         while (count--) {
2581                 c = *b++;
2582                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2583                         if (cnt > 0) {
2584                                 if (con_is_visible(vc))
2585                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2586                                 vc->vc_x += cnt;
2587                                 if (vc->vc_need_wrap)
2588                                         vc->vc_x--;
2589                                 cnt = 0;
2590                         }
2591                         if (c == 8) {           /* backspace */
2592                                 bs(vc);
2593                                 start = (ushort *)vc->vc_pos;
2594                                 myx = vc->vc_x;
2595                                 continue;
2596                         }
2597                         if (c != 13)
2598                                 lf(vc);
2599                         cr(vc);
2600                         start = (ushort *)vc->vc_pos;
2601                         myx = vc->vc_x;
2602                         if (c == 10 || c == 13)
2603                                 continue;
2604                 }
2605                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2606                 notify_write(vc, c);
2607                 cnt++;
2608                 if (myx == vc->vc_cols - 1) {
2609                         vc->vc_need_wrap = 1;
2610                         continue;
2611                 }
2612                 vc->vc_pos += 2;
2613                 myx++;
2614         }
2615         if (cnt > 0) {
2616                 if (con_is_visible(vc))
2617                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2618                 vc->vc_x += cnt;
2619                 if (vc->vc_x == vc->vc_cols) {
2620                         vc->vc_x--;
2621                         vc->vc_need_wrap = 1;
2622                 }
2623         }
2624         set_cursor(vc);
2625         notify_update(vc);
2626
2627 quit:
2628         spin_unlock(&printing_lock);
2629 }
2630
2631 static struct tty_driver *vt_console_device(struct console *c, int *index)
2632 {
2633         *index = c->index ? c->index-1 : fg_console;
2634         return console_driver;
2635 }
2636
2637 static struct console vt_console_driver = {
2638         .name           = "tty",
2639         .write          = vt_console_print,
2640         .device         = vt_console_device,
2641         .unblank        = unblank_screen,
2642         .flags          = CON_PRINTBUFFER,
2643         .index          = -1,
2644 };
2645 #endif
2646
2647 /*
2648  *      Handling of Linux-specific VC ioctls
2649  */
2650
2651 /*
2652  * Generally a bit racy with respect to console_lock();.
2653  *
2654  * There are some functions which don't need it.
2655  *
2656  * There are some functions which can sleep for arbitrary periods
2657  * (paste_selection) but we don't need the lock there anyway.
2658  *
2659  * set_selection has locking, and definitely needs it
2660  */
2661
2662 int tioclinux(struct tty_struct *tty, unsigned long arg)
2663 {
2664         char type, data;
2665         char __user *p = (char __user *)arg;
2666         int lines;
2667         int ret;
2668
2669         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2670                 return -EPERM;
2671         if (get_user(type, p))
2672                 return -EFAULT;
2673         ret = 0;
2674
2675         switch (type)
2676         {
2677                 case TIOCL_SETSEL:
2678                         console_lock();
2679                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2680                         console_unlock();
2681                         break;
2682                 case TIOCL_PASTESEL:
2683                         ret = paste_selection(tty);
2684                         break;
2685                 case TIOCL_UNBLANKSCREEN:
2686                         console_lock();
2687                         unblank_screen();
2688                         console_unlock();
2689                         break;
2690                 case TIOCL_SELLOADLUT:
2691                         console_lock();
2692                         ret = sel_loadlut(p);
2693                         console_unlock();
2694                         break;
2695                 case TIOCL_GETSHIFTSTATE:
2696
2697         /*
2698          * Make it possible to react to Shift+Mousebutton.
2699          * Note that 'shift_state' is an undocumented
2700          * kernel-internal variable; programs not closely
2701          * related to the kernel should not use this.
2702          */
2703                         data = vt_get_shift_state();
2704                         ret = __put_user(data, p);
2705                         break;
2706                 case TIOCL_GETMOUSEREPORTING:
2707                         console_lock(); /* May be overkill */
2708                         data = mouse_reporting();
2709                         console_unlock();
2710                         ret = __put_user(data, p);
2711                         break;
2712                 case TIOCL_SETVESABLANK:
2713                         console_lock();
2714                         ret = set_vesa_blanking(p);
2715                         console_unlock();
2716                         break;
2717                 case TIOCL_GETKMSGREDIRECT:
2718                         data = vt_get_kmsg_redirect();
2719                         ret = __put_user(data, p);
2720                         break;
2721                 case TIOCL_SETKMSGREDIRECT:
2722                         if (!capable(CAP_SYS_ADMIN)) {
2723                                 ret = -EPERM;
2724                         } else {
2725                                 if (get_user(data, p+1))
2726                                         ret = -EFAULT;
2727                                 else
2728                                         vt_kmsg_redirect(data);
2729                         }
2730                         break;
2731                 case TIOCL_GETFGCONSOLE:
2732                         /* No locking needed as this is a transiently
2733                            correct return anyway if the caller hasn't
2734                            disabled switching */
2735                         ret = fg_console;
2736                         break;
2737                 case TIOCL_SCROLLCONSOLE:
2738                         if (get_user(lines, (s32 __user *)(p+4))) {
2739                                 ret = -EFAULT;
2740                         } else {
2741                                 /* Need the console lock here. Note that lots
2742                                    of other calls need fixing before the lock
2743                                    is actually useful ! */
2744                                 console_lock();
2745                                 scrollfront(vc_cons[fg_console].d, lines);
2746                                 console_unlock();
2747                                 ret = 0;
2748                         }
2749                         break;
2750                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2751                         console_lock();
2752                         ignore_poke = 1;
2753                         do_blank_screen(0);
2754                         console_unlock();
2755                         break;
2756                 case TIOCL_BLANKEDSCREEN:
2757                         ret = console_blanked;
2758                         break;
2759                 default:
2760                         ret = -EINVAL;
2761                         break;
2762         }
2763         return ret;
2764 }
2765
2766 /*
2767  * /dev/ttyN handling
2768  */
2769
2770 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2771 {
2772         int     retval;
2773
2774         retval = do_con_write(tty, buf, count);
2775         con_flush_chars(tty);
2776
2777         return retval;
2778 }
2779
2780 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2781 {
2782         if (in_interrupt())
2783                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2784         return do_con_write(tty, &ch, 1);
2785 }
2786
2787 static int con_write_room(struct tty_struct *tty)
2788 {
2789         if (tty->stopped)
2790                 return 0;
2791         return 32768;           /* No limit, really; we're not buffering */
2792 }
2793
2794 static int con_chars_in_buffer(struct tty_struct *tty)
2795 {
2796         return 0;               /* we're not buffering */
2797 }
2798
2799 /*
2800  * con_throttle and con_unthrottle are only used for
2801  * paste_selection(), which has to stuff in a large number of
2802  * characters...
2803  */
2804 static void con_throttle(struct tty_struct *tty)
2805 {
2806 }
2807
2808 static void con_unthrottle(struct tty_struct *tty)
2809 {
2810         struct vc_data *vc = tty->driver_data;
2811
2812         wake_up_interruptible(&vc->paste_wait);
2813 }
2814
2815 /*
2816  * Turn the Scroll-Lock LED on when the tty is stopped
2817  */
2818 static void con_stop(struct tty_struct *tty)
2819 {
2820         int console_num;
2821         if (!tty)
2822                 return;
2823         console_num = tty->index;
2824         if (!vc_cons_allocated(console_num))
2825                 return;
2826         vt_kbd_con_stop(console_num);
2827 }
2828
2829 /*
2830  * Turn the Scroll-Lock LED off when the console is started
2831  */
2832 static void con_start(struct tty_struct *tty)
2833 {
2834         int console_num;
2835         if (!tty)
2836                 return;
2837         console_num = tty->index;
2838         if (!vc_cons_allocated(console_num))
2839                 return;
2840         vt_kbd_con_start(console_num);
2841 }
2842
2843 static void con_flush_chars(struct tty_struct *tty)
2844 {
2845         struct vc_data *vc;
2846
2847         if (in_interrupt())     /* from flush_to_ldisc */
2848                 return;
2849
2850         /* if we race with con_close(), vt may be null */
2851         console_lock();
2852         vc = tty->driver_data;
2853         if (vc)
2854                 set_cursor(vc);
2855         console_unlock();
2856 }
2857
2858 /*
2859  * Allocate the console screen memory.
2860  */
2861 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2862 {
2863         unsigned int currcons = tty->index;
2864         struct vc_data *vc;
2865         int ret;
2866
2867         console_lock();
2868         ret = vc_allocate(currcons);
2869         if (ret)
2870                 goto unlock;
2871
2872         vc = vc_cons[currcons].d;
2873
2874         /* Still being freed */
2875         if (vc->port.tty) {
2876                 ret = -ERESTARTSYS;
2877                 goto unlock;
2878         }
2879
2880         ret = tty_port_install(&vc->port, driver, tty);
2881         if (ret)
2882                 goto unlock;
2883
2884         tty->driver_data = vc;
2885         vc->port.tty = tty;
2886
2887         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2888                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2889                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2890         }
2891         if (vc->vc_utf)
2892                 tty->termios.c_iflag |= IUTF8;
2893         else
2894                 tty->termios.c_iflag &= ~IUTF8;
2895 unlock:
2896         console_unlock();
2897         return ret;
2898 }
2899
2900 static int con_open(struct tty_struct *tty, struct file *filp)
2901 {
2902         /* everything done in install */
2903         return 0;
2904 }
2905
2906
2907 static void con_close(struct tty_struct *tty, struct file *filp)
2908 {
2909         /* Nothing to do - we defer to shutdown */
2910 }
2911
2912 static void con_shutdown(struct tty_struct *tty)
2913 {
2914         struct vc_data *vc = tty->driver_data;
2915         BUG_ON(vc == NULL);
2916         console_lock();
2917         vc->port.tty = NULL;
2918         console_unlock();
2919 }
2920
2921 static int default_color           = 7; /* white */
2922 static int default_italic_color    = 2; // green (ASCII)
2923 static int default_underline_color = 3; // cyan (ASCII)
2924 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2925 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2926 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2927
2928 static void vc_init(struct vc_data *vc, unsigned int rows,
2929                     unsigned int cols, int do_clear)
2930 {
2931         int j, k ;
2932
2933         vc->vc_cols = cols;
2934         vc->vc_rows = rows;
2935         vc->vc_size_row = cols << 1;
2936         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2937
2938         set_origin(vc);
2939         vc->vc_pos = vc->vc_origin;
2940         reset_vc(vc);
2941         for (j=k=0; j<16; j++) {
2942                 vc->vc_palette[k++] = default_red[j] ;
2943                 vc->vc_palette[k++] = default_grn[j] ;
2944                 vc->vc_palette[k++] = default_blu[j] ;
2945         }
2946         vc->vc_def_color       = default_color;
2947         vc->vc_ulcolor         = default_underline_color;
2948         vc->vc_itcolor         = default_italic_color;
2949         vc->vc_halfcolor       = 0x08;   /* grey */
2950         init_waitqueue_head(&vc->paste_wait);
2951         reset_terminal(vc, do_clear);
2952 }
2953
2954 /*
2955  * This routine initializes console interrupts, and does nothing
2956  * else. If you want the screen to clear, call tty_write with
2957  * the appropriate escape-sequence.
2958  */
2959
2960 static int __init con_init(void)
2961 {
2962         const char *display_desc = NULL;
2963         struct vc_data *vc;
2964         unsigned int currcons = 0, i;
2965
2966         console_lock();
2967
2968         if (conswitchp)
2969                 display_desc = conswitchp->con_startup();
2970         if (!display_desc) {
2971                 fg_console = 0;
2972                 console_unlock();
2973                 return 0;
2974         }
2975
2976         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2977                 struct con_driver *con_driver = &registered_con_driver[i];
2978
2979                 if (con_driver->con == NULL) {
2980                         con_driver->con = conswitchp;
2981                         con_driver->desc = display_desc;
2982                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2983                         con_driver->first = 0;
2984                         con_driver->last = MAX_NR_CONSOLES - 1;
2985                         break;
2986                 }
2987         }
2988
2989         for (i = 0; i < MAX_NR_CONSOLES; i++)
2990                 con_driver_map[i] = conswitchp;
2991
2992         if (blankinterval) {
2993                 blank_state = blank_normal_wait;
2994                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2995         }
2996
2997         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2998                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2999                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3000                 tty_port_init(&vc->port);
3001                 visual_init(vc, currcons, 1);
3002                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3003                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3004                         currcons || !vc->vc_sw->con_save_screen);
3005         }
3006         currcons = fg_console = 0;
3007         master_display_fg = vc = vc_cons[currcons].d;
3008         set_origin(vc);
3009         save_screen(vc);
3010         gotoxy(vc, vc->vc_x, vc->vc_y);
3011         csi_J(vc, 0);
3012         update_screen(vc);
3013         pr_info("Console: %s %s %dx%d\n",
3014                 vc->vc_can_do_color ? "colour" : "mono",
3015                 display_desc, vc->vc_cols, vc->vc_rows);
3016         printable = 1;
3017
3018         console_unlock();
3019
3020 #ifdef CONFIG_VT_CONSOLE
3021         register_console(&vt_console_driver);
3022 #endif
3023         return 0;
3024 }
3025 console_initcall(con_init);
3026
3027 static const struct tty_operations con_ops = {
3028         .install = con_install,
3029         .open = con_open,
3030         .close = con_close,
3031         .write = con_write,
3032         .write_room = con_write_room,
3033         .put_char = con_put_char,
3034         .flush_chars = con_flush_chars,
3035         .chars_in_buffer = con_chars_in_buffer,
3036         .ioctl = vt_ioctl,
3037 #ifdef CONFIG_COMPAT
3038         .compat_ioctl = vt_compat_ioctl,
3039 #endif
3040         .stop = con_stop,
3041         .start = con_start,
3042         .throttle = con_throttle,
3043         .unthrottle = con_unthrottle,
3044         .resize = vt_resize,
3045         .shutdown = con_shutdown
3046 };
3047
3048 static struct cdev vc0_cdev;
3049
3050 static ssize_t show_tty_active(struct device *dev,
3051                                 struct device_attribute *attr, char *buf)
3052 {
3053         return sprintf(buf, "tty%d\n", fg_console + 1);
3054 }
3055 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3056
3057 static struct attribute *vt_dev_attrs[] = {
3058         &dev_attr_active.attr,
3059         NULL
3060 };
3061
3062 ATTRIBUTE_GROUPS(vt_dev);
3063
3064 int __init vty_init(const struct file_operations *console_fops)
3065 {
3066         cdev_init(&vc0_cdev, console_fops);
3067         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3068             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3069                 panic("Couldn't register /dev/tty0 driver\n");
3070         tty0dev = device_create_with_groups(tty_class, NULL,
3071                                             MKDEV(TTY_MAJOR, 0), NULL,
3072                                             vt_dev_groups, "tty0");
3073         if (IS_ERR(tty0dev))
3074                 tty0dev = NULL;
3075
3076         vcs_init();
3077
3078         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3079         if (!console_driver)
3080                 panic("Couldn't allocate console driver\n");
3081
3082         console_driver->name = "tty";
3083         console_driver->name_base = 1;
3084         console_driver->major = TTY_MAJOR;
3085         console_driver->minor_start = 1;
3086         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3087         console_driver->init_termios = tty_std_termios;
3088         if (default_utf8)
3089                 console_driver->init_termios.c_iflag |= IUTF8;
3090         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3091         tty_set_operations(console_driver, &con_ops);
3092         if (tty_register_driver(console_driver))
3093                 panic("Couldn't register console driver\n");
3094         kbd_init();
3095         console_map_init();
3096 #ifdef CONFIG_MDA_CONSOLE
3097         mda_console_init();
3098 #endif
3099         return 0;
3100 }
3101
3102 #ifndef VT_SINGLE_DRIVER
3103
3104 static struct class *vtconsole_class;
3105
3106 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3107                            int deflt)
3108 {
3109         struct module *owner = csw->owner;
3110         const char *desc = NULL;
3111         struct con_driver *con_driver;
3112         int i, j = -1, k = -1, retval = -ENODEV;
3113
3114         if (!try_module_get(owner))
3115                 return -ENODEV;
3116
3117         WARN_CONSOLE_UNLOCKED();
3118
3119         /* check if driver is registered */
3120         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3121                 con_driver = &registered_con_driver[i];
3122
3123                 if (con_driver->con == csw) {
3124                         desc = con_driver->desc;
3125                         retval = 0;
3126                         break;
3127                 }
3128         }
3129
3130         if (retval)
3131                 goto err;
3132
3133         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3134                 csw->con_startup();
3135                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3136         }
3137
3138         if (deflt) {
3139                 if (conswitchp)
3140                         module_put(conswitchp->owner);
3141
3142                 __module_get(owner);
3143                 conswitchp = csw;
3144         }
3145
3146         first = max(first, con_driver->first);
3147         last = min(last, con_driver->last);
3148
3149         for (i = first; i <= last; i++) {
3150                 int old_was_color;
3151                 struct vc_data *vc = vc_cons[i].d;
3152
3153                 if (con_driver_map[i])
3154                         module_put(con_driver_map[i]->owner);
3155                 __module_get(owner);
3156                 con_driver_map[i] = csw;
3157
3158                 if (!vc || !vc->vc_sw)
3159                         continue;
3160
3161                 j = i;
3162
3163                 if (con_is_visible(vc)) {
3164                         k = i;
3165                         save_screen(vc);
3166                 }
3167
3168                 old_was_color = vc->vc_can_do_color;
3169                 vc->vc_sw->con_deinit(vc);
3170                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3171                 visual_init(vc, i, 0);
3172                 set_origin(vc);
3173                 update_attr(vc);
3174
3175                 /* If the console changed between mono <-> color, then
3176                  * the attributes in the screenbuf will be wrong.  The
3177                  * following resets all attributes to something sane.
3178                  */
3179                 if (old_was_color != vc->vc_can_do_color)
3180                         clear_buffer_attributes(vc);
3181         }
3182
3183         pr_info("Console: switching ");
3184         if (!deflt)
3185                 printk("consoles %d-%d ", first+1, last+1);
3186         if (j >= 0) {
3187                 struct vc_data *vc = vc_cons[j].d;
3188
3189                 printk("to %s %s %dx%d\n",
3190                        vc->vc_can_do_color ? "colour" : "mono",
3191                        desc, vc->vc_cols, vc->vc_rows);
3192
3193                 if (k >= 0) {
3194                         vc = vc_cons[k].d;
3195                         update_screen(vc);
3196                 }
3197         } else
3198                 printk("to %s\n", desc);
3199
3200         retval = 0;
3201 err:
3202         module_put(owner);
3203         return retval;
3204 };
3205
3206
3207 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3208 /* unlocked version of unbind_con_driver() */
3209 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3210 {
3211         struct module *owner = csw->owner;
3212         const struct consw *defcsw = NULL;
3213         struct con_driver *con_driver = NULL, *con_back = NULL;
3214         int i, retval = -ENODEV;
3215
3216         if (!try_module_get(owner))
3217                 return -ENODEV;
3218
3219         WARN_CONSOLE_UNLOCKED();
3220
3221         /* check if driver is registered and if it is unbindable */
3222         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3223                 con_driver = &registered_con_driver[i];
3224
3225                 if (con_driver->con == csw &&
3226                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3227                         retval = 0;
3228                         break;
3229                 }
3230         }
3231
3232         if (retval)
3233                 goto err;
3234
3235         retval = -ENODEV;
3236
3237         /* check if backup driver exists */
3238         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3239                 con_back = &registered_con_driver[i];
3240
3241                 if (con_back->con && con_back->con != csw) {
3242                         defcsw = con_back->con;
3243                         retval = 0;
3244                         break;
3245                 }
3246         }
3247
3248         if (retval)
3249                 goto err;
3250
3251         if (!con_is_bound(csw))
3252                 goto err;
3253
3254         first = max(first, con_driver->first);
3255         last = min(last, con_driver->last);
3256
3257         for (i = first; i <= last; i++) {
3258                 if (con_driver_map[i] == csw) {
3259                         module_put(csw->owner);
3260                         con_driver_map[i] = NULL;
3261                 }
3262         }
3263
3264         if (!con_is_bound(defcsw)) {
3265                 const struct consw *defconsw = conswitchp;
3266
3267                 defcsw->con_startup();
3268                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3269                 /*
3270                  * vgacon may change the default driver to point
3271                  * to dummycon, we restore it here...
3272                  */
3273                 conswitchp = defconsw;
3274         }
3275
3276         if (!con_is_bound(csw))
3277                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3278
3279         /* ignore return value, binding should not fail */
3280         do_bind_con_driver(defcsw, first, last, deflt);
3281 err:
3282         module_put(owner);
3283         return retval;
3284
3285 }
3286 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3287
3288 static int vt_bind(struct con_driver *con)
3289 {
3290         const struct consw *defcsw = NULL, *csw = NULL;
3291         int i, more = 1, first = -1, last = -1, deflt = 0;
3292
3293         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3294                 goto err;
3295
3296         csw = con->con;
3297
3298         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3299                 struct con_driver *con = &registered_con_driver[i];
3300
3301                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3302                         defcsw = con->con;
3303                         break;
3304                 }
3305         }
3306
3307         if (!defcsw)
3308                 goto err;
3309
3310         while (more) {
3311                 more = 0;
3312
3313                 for (i = con->first; i <= con->last; i++) {
3314                         if (con_driver_map[i] == defcsw) {
3315                                 if (first == -1)
3316                                         first = i;
3317                                 last = i;
3318                                 more = 1;
3319                         } else if (first != -1)
3320                                 break;
3321                 }
3322
3323                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3324                         deflt = 1;
3325
3326                 if (first != -1)
3327                         do_bind_con_driver(csw, first, last, deflt);
3328
3329                 first = -1;
3330                 last = -1;
3331                 deflt = 0;
3332         }
3333
3334 err:
3335         return 0;
3336 }
3337
3338 static int vt_unbind(struct con_driver *con)
3339 {
3340         const struct consw *csw = NULL;
3341         int i, more = 1, first = -1, last = -1, deflt = 0;
3342         int ret;
3343
3344         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3345                 goto err;
3346
3347         csw = con->con;
3348
3349         while (more) {
3350                 more = 0;
3351
3352                 for (i = con->first; i <= con->last; i++) {
3353                         if (con_driver_map[i] == csw) {
3354                                 if (first == -1)
3355                                         first = i;
3356                                 last = i;
3357                                 more = 1;
3358                         } else if (first != -1)
3359                                 break;
3360                 }
3361
3362                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3363                         deflt = 1;
3364
3365                 if (first != -1) {
3366                         ret = do_unbind_con_driver(csw, first, last, deflt);
3367                         if (ret != 0)
3368                                 return ret;
3369                 }
3370
3371                 first = -1;
3372                 last = -1;
3373                 deflt = 0;
3374         }
3375
3376 err:
3377         return 0;
3378 }
3379 #else
3380 static inline int vt_bind(struct con_driver *con)
3381 {
3382         return 0;
3383 }
3384 static inline int vt_unbind(struct con_driver *con)
3385 {
3386         return 0;
3387 }
3388 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3389
3390 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3391                           const char *buf, size_t count)
3392 {
3393         struct con_driver *con = dev_get_drvdata(dev);
3394         int bind = simple_strtoul(buf, NULL, 0);
3395
3396         console_lock();
3397
3398         if (bind)
3399                 vt_bind(con);
3400         else
3401                 vt_unbind(con);
3402
3403         console_unlock();
3404
3405         return count;
3406 }
3407
3408 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3409                          char *buf)
3410 {
3411         struct con_driver *con = dev_get_drvdata(dev);
3412         int bind = con_is_bound(con->con);
3413
3414         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3415 }
3416
3417 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3418                          char *buf)
3419 {
3420         struct con_driver *con = dev_get_drvdata(dev);
3421
3422         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3423                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3424                          con->desc);
3425
3426 }
3427
3428 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3429 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3430
3431 static struct attribute *con_dev_attrs[] = {
3432         &dev_attr_bind.attr,
3433         &dev_attr_name.attr,
3434         NULL
3435 };
3436
3437 ATTRIBUTE_GROUPS(con_dev);
3438
3439 static int vtconsole_init_device(struct con_driver *con)
3440 {
3441         con->flag |= CON_DRIVER_FLAG_ATTR;
3442         return 0;
3443 }
3444
3445 static void vtconsole_deinit_device(struct con_driver *con)
3446 {
3447         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3448 }
3449
3450 /**
3451  * con_is_bound - checks if driver is bound to the console
3452  * @csw: console driver
3453  *
3454  * RETURNS: zero if unbound, nonzero if bound
3455  *
3456  * Drivers can call this and if zero, they should release
3457  * all resources allocated on con_startup()
3458  */
3459 int con_is_bound(const struct consw *csw)
3460 {
3461         int i, bound = 0;
3462
3463         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3464                 if (con_driver_map[i] == csw) {
3465                         bound = 1;
3466                         break;
3467                 }
3468         }
3469
3470         return bound;
3471 }
3472 EXPORT_SYMBOL(con_is_bound);
3473
3474 /**
3475  * con_debug_enter - prepare the console for the kernel debugger
3476  * @sw: console driver
3477  *
3478  * Called when the console is taken over by the kernel debugger, this
3479  * function needs to save the current console state, then put the console
3480  * into a state suitable for the kernel debugger.
3481  *
3482  * RETURNS:
3483  * Zero on success, nonzero if a failure occurred when trying to prepare
3484  * the console for the debugger.
3485  */
3486 int con_debug_enter(struct vc_data *vc)
3487 {
3488         int ret = 0;
3489
3490         saved_fg_console = fg_console;
3491         saved_last_console = last_console;
3492         saved_want_console = want_console;
3493         saved_vc_mode = vc->vc_mode;
3494         saved_console_blanked = console_blanked;
3495         vc->vc_mode = KD_TEXT;
3496         console_blanked = 0;
3497         if (vc->vc_sw->con_debug_enter)
3498                 ret = vc->vc_sw->con_debug_enter(vc);
3499 #ifdef CONFIG_KGDB_KDB
3500         /* Set the initial LINES variable if it is not already set */
3501         if (vc->vc_rows < 999) {
3502                 int linecount;
3503                 char lns[4];
3504                 const char *setargs[3] = {
3505                         "set",
3506                         "LINES",
3507                         lns,
3508                 };
3509                 if (kdbgetintenv(setargs[0], &linecount)) {
3510                         snprintf(lns, 4, "%i", vc->vc_rows);
3511                         kdb_set(2, setargs);
3512                 }
3513         }
3514         if (vc->vc_cols < 999) {
3515                 int colcount;
3516                 char cols[4];
3517                 const char *setargs[3] = {
3518                         "set",
3519                         "COLUMNS",
3520                         cols,
3521                 };
3522                 if (kdbgetintenv(setargs[0], &colcount)) {
3523                         snprintf(cols, 4, "%i", vc->vc_cols);
3524                         kdb_set(2, setargs);
3525                 }
3526         }
3527 #endif /* CONFIG_KGDB_KDB */
3528         return ret;
3529 }
3530 EXPORT_SYMBOL_GPL(con_debug_enter);
3531
3532 /**
3533  * con_debug_leave - restore console state
3534  * @sw: console driver
3535  *
3536  * Restore the console state to what it was before the kernel debugger
3537  * was invoked.
3538  *
3539  * RETURNS:
3540  * Zero on success, nonzero if a failure occurred when trying to restore
3541  * the console.
3542  */
3543 int con_debug_leave(void)
3544 {
3545         struct vc_data *vc;
3546         int ret = 0;
3547
3548         fg_console = saved_fg_console;
3549         last_console = saved_last_console;
3550         want_console = saved_want_console;
3551         console_blanked = saved_console_blanked;
3552         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3553
3554         vc = vc_cons[fg_console].d;
3555         if (vc->vc_sw->con_debug_leave)
3556                 ret = vc->vc_sw->con_debug_leave(vc);
3557         return ret;
3558 }
3559 EXPORT_SYMBOL_GPL(con_debug_leave);
3560
3561 static int do_register_con_driver(const struct consw *csw, int first, int last)
3562 {
3563         struct module *owner = csw->owner;
3564         struct con_driver *con_driver;
3565         const char *desc;
3566         int i, retval;
3567
3568         WARN_CONSOLE_UNLOCKED();
3569
3570         if (!try_module_get(owner))
3571                 return -ENODEV;
3572
3573         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3574                 con_driver = &registered_con_driver[i];
3575
3576                 /* already registered */
3577                 if (con_driver->con == csw) {
3578                         retval = -EBUSY;
3579                         goto err;
3580                 }
3581         }
3582
3583         desc = csw->con_startup();
3584         if (!desc) {
3585                 retval = -ENODEV;
3586                 goto err;
3587         }
3588
3589         retval = -EINVAL;
3590
3591         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3592                 con_driver = &registered_con_driver[i];
3593
3594                 if (con_driver->con == NULL &&
3595                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3596                         con_driver->con = csw;
3597                         con_driver->desc = desc;
3598                         con_driver->node = i;
3599                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3600                                            CON_DRIVER_FLAG_INIT;
3601                         con_driver->first = first;
3602                         con_driver->last = last;
3603                         retval = 0;
3604                         break;
3605                 }
3606         }
3607
3608         if (retval)
3609                 goto err;
3610
3611         con_driver->dev =
3612                 device_create_with_groups(vtconsole_class, NULL,
3613                                           MKDEV(0, con_driver->node),
3614                                           con_driver, con_dev_groups,
3615                                           "vtcon%i", con_driver->node);
3616         if (IS_ERR(con_driver->dev)) {
3617                 printk(KERN_WARNING "Unable to create device for %s; "
3618                        "errno = %ld\n", con_driver->desc,
3619                        PTR_ERR(con_driver->dev));
3620                 con_driver->dev = NULL;
3621         } else {
3622                 vtconsole_init_device(con_driver);
3623         }
3624
3625 err:
3626         module_put(owner);
3627         return retval;
3628 }
3629
3630
3631 /**
3632  * do_unregister_con_driver - unregister console driver from console layer
3633  * @csw: console driver
3634  *
3635  * DESCRIPTION: All drivers that registers to the console layer must
3636  * call this function upon exit, or if the console driver is in a state
3637  * where it won't be able to handle console services, such as the
3638  * framebuffer console without loaded framebuffer drivers.
3639  *
3640  * The driver must unbind first prior to unregistration.
3641  */
3642 int do_unregister_con_driver(const struct consw *csw)
3643 {
3644         int i;
3645
3646         /* cannot unregister a bound driver */
3647         if (con_is_bound(csw))
3648                 return -EBUSY;
3649
3650         if (csw == conswitchp)
3651                 return -EINVAL;
3652
3653         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3654                 struct con_driver *con_driver = &registered_con_driver[i];
3655
3656                 if (con_driver->con == csw) {
3657                         /*
3658                          * Defer the removal of the sysfs entries since that
3659                          * will acquire the kernfs s_active lock and we can't
3660                          * acquire this lock while holding the console lock:
3661                          * the unbind sysfs entry imposes already the opposite
3662                          * order. Reset con already here to prevent any later
3663                          * lookup to succeed and mark this slot as zombie, so
3664                          * it won't get reused until we complete the removal
3665                          * in the deferred work.
3666                          */
3667                         con_driver->con = NULL;
3668                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3669                         schedule_work(&con_driver_unregister_work);
3670
3671                         return 0;
3672                 }
3673         }
3674
3675         return -ENODEV;
3676 }
3677 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3678
3679 static void con_driver_unregister_callback(struct work_struct *ignored)
3680 {
3681         int i;
3682
3683         console_lock();
3684
3685         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3686                 struct con_driver *con_driver = &registered_con_driver[i];
3687
3688                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3689                         continue;
3690
3691                 console_unlock();
3692
3693                 vtconsole_deinit_device(con_driver);
3694                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3695
3696                 console_lock();
3697
3698                 if (WARN_ON_ONCE(con_driver->con))
3699                         con_driver->con = NULL;
3700                 con_driver->desc = NULL;
3701                 con_driver->dev = NULL;
3702                 con_driver->node = 0;
3703                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3704                 con_driver->flag = 0;
3705                 con_driver->first = 0;
3706                 con_driver->last = 0;
3707         }
3708
3709         console_unlock();
3710 }
3711
3712 /*
3713  *      If we support more console drivers, this function is used
3714  *      when a driver wants to take over some existing consoles
3715  *      and become default driver for newly opened ones.
3716  *
3717  *      do_take_over_console is basically a register followed by unbind
3718  */
3719 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3720 {
3721         int err;
3722
3723         err = do_register_con_driver(csw, first, last);
3724         /*
3725          * If we get an busy error we still want to bind the console driver
3726          * and return success, as we may have unbound the console driver
3727          * but not unregistered it.
3728          */
3729         if (err == -EBUSY)
3730                 err = 0;
3731         if (!err)
3732                 do_bind_con_driver(csw, first, last, deflt);
3733
3734         return err;
3735 }
3736 EXPORT_SYMBOL_GPL(do_take_over_console);
3737
3738
3739 /*
3740  * give_up_console is a wrapper to unregister_con_driver. It will only
3741  * work if driver is fully unbound.
3742  */
3743 void give_up_console(const struct consw *csw)
3744 {
3745         console_lock();
3746         do_unregister_con_driver(csw);
3747         console_unlock();
3748 }
3749
3750 static int __init vtconsole_class_init(void)
3751 {
3752         int i;
3753
3754         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3755         if (IS_ERR(vtconsole_class)) {
3756                 printk(KERN_WARNING "Unable to create vt console class; "
3757                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3758                 vtconsole_class = NULL;
3759         }
3760
3761         /* Add system drivers to sysfs */
3762         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3763                 struct con_driver *con = &registered_con_driver[i];
3764
3765                 if (con->con && !con->dev) {
3766                         con->dev =
3767                                 device_create_with_groups(vtconsole_class, NULL,
3768                                                           MKDEV(0, con->node),
3769                                                           con, con_dev_groups,
3770                                                           "vtcon%i", con->node);
3771
3772                         if (IS_ERR(con->dev)) {
3773                                 printk(KERN_WARNING "Unable to create "
3774                                        "device for %s; errno = %ld\n",
3775                                        con->desc, PTR_ERR(con->dev));
3776                                 con->dev = NULL;
3777                         } else {
3778                                 vtconsole_init_device(con);
3779                         }
3780                 }
3781         }
3782
3783         return 0;
3784 }
3785 postcore_initcall(vtconsole_class_init);
3786
3787 #endif
3788
3789 /*
3790  *      Screen blanking
3791  */
3792
3793 static int set_vesa_blanking(char __user *p)
3794 {
3795         unsigned int mode;
3796
3797         if (get_user(mode, p + 1))
3798                 return -EFAULT;
3799
3800         vesa_blank_mode = (mode < 4) ? mode : 0;
3801         return 0;
3802 }
3803
3804 void do_blank_screen(int entering_gfx)
3805 {
3806         struct vc_data *vc = vc_cons[fg_console].d;
3807         int i;
3808
3809         WARN_CONSOLE_UNLOCKED();
3810
3811         if (console_blanked) {
3812                 if (blank_state == blank_vesa_wait) {
3813                         blank_state = blank_off;
3814                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3815                 }
3816                 return;
3817         }
3818
3819         /* entering graphics mode? */
3820         if (entering_gfx) {
3821                 hide_cursor(vc);
3822                 save_screen(vc);
3823                 vc->vc_sw->con_blank(vc, -1, 1);
3824                 console_blanked = fg_console + 1;
3825                 blank_state = blank_off;
3826                 set_origin(vc);
3827                 return;
3828         }
3829
3830         if (blank_state != blank_normal_wait)
3831                 return;
3832         blank_state = blank_off;
3833
3834         /* don't blank graphics */
3835         if (vc->vc_mode != KD_TEXT) {
3836                 console_blanked = fg_console + 1;
3837                 return;
3838         }
3839
3840         hide_cursor(vc);
3841         del_timer_sync(&console_timer);
3842         blank_timer_expired = 0;
3843
3844         save_screen(vc);
3845         /* In case we need to reset origin, blanking hook returns 1 */
3846         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3847         console_blanked = fg_console + 1;
3848         if (i)
3849                 set_origin(vc);
3850
3851         if (console_blank_hook && console_blank_hook(1))
3852                 return;
3853
3854         if (vesa_off_interval && vesa_blank_mode) {
3855                 blank_state = blank_vesa_wait;
3856                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3857         }
3858         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3859 }
3860 EXPORT_SYMBOL(do_blank_screen);
3861
3862 /*
3863  * Called by timer as well as from vt_console_driver
3864  */
3865 void do_unblank_screen(int leaving_gfx)
3866 {
3867         struct vc_data *vc;
3868
3869         /* This should now always be called from a "sane" (read: can schedule)
3870          * context for the sake of the low level drivers, except in the special
3871          * case of oops_in_progress
3872          */
3873         if (!oops_in_progress)
3874                 might_sleep();
3875
3876         WARN_CONSOLE_UNLOCKED();
3877
3878         ignore_poke = 0;
3879         if (!console_blanked)
3880                 return;
3881         if (!vc_cons_allocated(fg_console)) {
3882                 /* impossible */
3883                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3884                         fg_console + 1);
3885                 return;
3886         }
3887         vc = vc_cons[fg_console].d;
3888         /* Try to unblank in oops case too */
3889         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3890                 return; /* but leave console_blanked != 0 */
3891
3892         if (blankinterval) {
3893                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3894                 blank_state = blank_normal_wait;
3895         }
3896
3897         console_blanked = 0;
3898         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3899                 /* Low-level driver cannot restore -> do it ourselves */
3900                 update_screen(vc);
3901         if (console_blank_hook)
3902                 console_blank_hook(0);
3903         set_palette(vc);
3904         set_cursor(vc);
3905         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3906 }
3907 EXPORT_SYMBOL(do_unblank_screen);
3908
3909 /*
3910  * This is called by the outside world to cause a forced unblank, mostly for
3911  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3912  * call it with 1 as an argument and so force a mode restore... that may kill
3913  * X or at least garbage the screen but would also make the Oops visible...
3914  */
3915 void unblank_screen(void)
3916 {
3917         do_unblank_screen(0);
3918 }
3919
3920 /*
3921  * We defer the timer blanking to work queue so it can take the console mutex
3922  * (console operations can still happen at irq time, but only from printk which
3923  * has the console mutex. Not perfect yet, but better than no locking
3924  */
3925 static void blank_screen_t(unsigned long dummy)
3926 {
3927         if (unlikely(!keventd_up())) {
3928                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3929                 return;
3930         }
3931         blank_timer_expired = 1;
3932         schedule_work(&console_work);
3933 }
3934
3935 void poke_blanked_console(void)
3936 {
3937         WARN_CONSOLE_UNLOCKED();
3938
3939         /* Add this so we quickly catch whoever might call us in a non
3940          * safe context. Nowadays, unblank_screen() isn't to be called in
3941          * atomic contexts and is allowed to schedule (with the special case
3942          * of oops_in_progress, but that isn't of any concern for this
3943          * function. --BenH.
3944          */
3945         might_sleep();
3946
3947         /* This isn't perfectly race free, but a race here would be mostly harmless,
3948          * at worse, we'll do a spurrious blank and it's unlikely
3949          */
3950         del_timer(&console_timer);
3951         blank_timer_expired = 0;
3952
3953         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3954                 return;
3955         if (console_blanked)
3956                 unblank_screen();
3957         else if (blankinterval) {
3958                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3959                 blank_state = blank_normal_wait;
3960         }
3961 }
3962
3963 /*
3964  *      Palettes
3965  */
3966
3967 static void set_palette(struct vc_data *vc)
3968 {
3969         WARN_CONSOLE_UNLOCKED();
3970
3971         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3972                 vc->vc_sw->con_set_palette(vc, color_table);
3973 }
3974
3975 /*
3976  * Load palette into the DAC registers. arg points to a colour
3977  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3978  */
3979
3980 int con_set_cmap(unsigned char __user *arg)
3981 {
3982         int i, j, k;
3983         unsigned char colormap[3*16];
3984
3985         if (copy_from_user(colormap, arg, sizeof(colormap)))
3986                 return -EFAULT;
3987
3988         console_lock();
3989         for (i = k = 0; i < 16; i++) {
3990                 default_red[i] = colormap[k++];
3991                 default_grn[i] = colormap[k++];
3992                 default_blu[i] = colormap[k++];
3993         }
3994         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3995                 if (!vc_cons_allocated(i))
3996                         continue;
3997                 for (j = k = 0; j < 16; j++) {
3998                         vc_cons[i].d->vc_palette[k++] = default_red[j];
3999                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4000                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4001                 }
4002                 set_palette(vc_cons[i].d);
4003         }
4004         console_unlock();
4005
4006         return 0;
4007 }
4008
4009 int con_get_cmap(unsigned char __user *arg)
4010 {
4011         int i, k;
4012         unsigned char colormap[3*16];
4013
4014         console_lock();
4015         for (i = k = 0; i < 16; i++) {
4016                 colormap[k++] = default_red[i];
4017                 colormap[k++] = default_grn[i];
4018                 colormap[k++] = default_blu[i];
4019         }
4020         console_unlock();
4021
4022         if (copy_to_user(arg, colormap, sizeof(colormap)))
4023                 return -EFAULT;
4024
4025         return 0;
4026 }
4027
4028 void reset_palette(struct vc_data *vc)
4029 {
4030         int j, k;
4031         for (j=k=0; j<16; j++) {
4032                 vc->vc_palette[k++] = default_red[j];
4033                 vc->vc_palette[k++] = default_grn[j];
4034                 vc->vc_palette[k++] = default_blu[j];
4035         }
4036         set_palette(vc);
4037 }
4038
4039 /*
4040  *  Font switching
4041  *
4042  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4043  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4044  *  depending on width) reserved for each character which is kinda wasty, but
4045  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4046  *  is up to the actual low-level console-driver convert data into its favorite
4047  *  format (maybe we should add a `fontoffset' field to the `display'
4048  *  structure so we won't have to convert the fontdata all the time.
4049  *  /Jes
4050  */
4051
4052 #define max_font_size 65536
4053
4054 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4055 {
4056         struct console_font font;
4057         int rc = -EINVAL;
4058         int c;
4059
4060         if (op->data) {
4061                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4062                 if (!font.data)
4063                         return -ENOMEM;
4064         } else
4065                 font.data = NULL;
4066
4067         console_lock();
4068         if (vc->vc_mode != KD_TEXT)
4069                 rc = -EINVAL;
4070         else if (vc->vc_sw->con_font_get)
4071                 rc = vc->vc_sw->con_font_get(vc, &font);
4072         else
4073                 rc = -ENOSYS;
4074         console_unlock();
4075
4076         if (rc)
4077                 goto out;
4078
4079         c = (font.width+7)/8 * 32 * font.charcount;
4080
4081         if (op->data && font.charcount > op->charcount)
4082                 rc = -ENOSPC;
4083         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4084                 if (font.width > op->width || font.height > op->height)
4085                         rc = -ENOSPC;
4086         } else {
4087                 if (font.width != 8)
4088                         rc = -EIO;
4089                 else if ((op->height && font.height > op->height) ||
4090                          font.height > 32)
4091                         rc = -ENOSPC;
4092         }
4093         if (rc)
4094                 goto out;
4095
4096         op->height = font.height;
4097         op->width = font.width;
4098         op->charcount = font.charcount;
4099
4100         if (op->data && copy_to_user(op->data, font.data, c))
4101                 rc = -EFAULT;
4102
4103 out:
4104         kfree(font.data);
4105         return rc;
4106 }
4107
4108 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4109 {
4110         struct console_font font;
4111         int rc = -EINVAL;
4112         int size;
4113
4114         if (vc->vc_mode != KD_TEXT)
4115                 return -EINVAL;
4116         if (!op->data)
4117                 return -EINVAL;
4118         if (op->charcount > 512)
4119                 return -EINVAL;
4120         if (!op->height) {              /* Need to guess font height [compat] */
4121                 int h, i;
4122                 u8 __user *charmap = op->data;
4123                 u8 tmp;
4124
4125                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4126                    so that we can get rid of this soon */
4127                 if (!(op->flags & KD_FONT_FLAG_OLD))
4128                         return -EINVAL;
4129                 for (h = 32; h > 0; h--)
4130                         for (i = 0; i < op->charcount; i++) {
4131                                 if (get_user(tmp, &charmap[32*i+h-1]))
4132                                         return -EFAULT;
4133                                 if (tmp)
4134                                         goto nonzero;
4135                         }
4136                 return -EINVAL;
4137         nonzero:
4138                 op->height = h;
4139         }
4140         if (op->width <= 0 || op->width > 32 || op->height > 32)
4141                 return -EINVAL;
4142         size = (op->width+7)/8 * 32 * op->charcount;
4143         if (size > max_font_size)
4144                 return -ENOSPC;
4145         font.charcount = op->charcount;
4146         font.height = op->height;
4147         font.width = op->width;
4148         font.data = memdup_user(op->data, size);
4149         if (IS_ERR(font.data))
4150                 return PTR_ERR(font.data);
4151         console_lock();
4152         if (vc->vc_mode != KD_TEXT)
4153                 rc = -EINVAL;
4154         else if (vc->vc_sw->con_font_set)
4155                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4156         else
4157                 rc = -ENOSYS;
4158         console_unlock();
4159         kfree(font.data);
4160         return rc;
4161 }
4162
4163 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4164 {
4165         struct console_font font = {.width = op->width, .height = op->height};
4166         char name[MAX_FONT_NAME];
4167         char *s = name;
4168         int rc;
4169
4170
4171         if (!op->data)
4172                 s = NULL;
4173         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4174                 return -EFAULT;
4175         else
4176                 name[MAX_FONT_NAME - 1] = 0;
4177
4178         console_lock();
4179         if (vc->vc_mode != KD_TEXT) {
4180                 console_unlock();
4181                 return -EINVAL;
4182         }
4183         if (vc->vc_sw->con_font_default)
4184                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4185         else
4186                 rc = -ENOSYS;
4187         console_unlock();
4188         if (!rc) {
4189                 op->width = font.width;
4190                 op->height = font.height;
4191         }
4192         return rc;
4193 }
4194
4195 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4196 {
4197         int con = op->height;
4198         int rc;
4199
4200
4201         console_lock();
4202         if (vc->vc_mode != KD_TEXT)
4203                 rc = -EINVAL;
4204         else if (!vc->vc_sw->con_font_copy)
4205                 rc = -ENOSYS;
4206         else if (con < 0 || !vc_cons_allocated(con))
4207                 rc = -ENOTTY;
4208         else if (con == vc->vc_num)     /* nothing to do */
4209                 rc = 0;
4210         else
4211                 rc = vc->vc_sw->con_font_copy(vc, con);
4212         console_unlock();
4213         return rc;
4214 }
4215
4216 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4217 {
4218         switch (op->op) {
4219         case KD_FONT_OP_SET:
4220                 return con_font_set(vc, op);
4221         case KD_FONT_OP_GET:
4222                 return con_font_get(vc, op);
4223         case KD_FONT_OP_SET_DEFAULT:
4224                 return con_font_default(vc, op);
4225         case KD_FONT_OP_COPY:
4226                 return con_font_copy(vc, op);
4227         }
4228         return -ENOSYS;
4229 }
4230
4231 /*
4232  *      Interface exported to selection and vcs.
4233  */
4234
4235 /* used by selection */
4236 u16 screen_glyph(struct vc_data *vc, int offset)
4237 {
4238         u16 w = scr_readw(screenpos(vc, offset, 1));
4239         u16 c = w & 0xff;
4240
4241         if (w & vc->vc_hi_font_mask)
4242                 c |= 0x100;
4243         return c;
4244 }
4245 EXPORT_SYMBOL_GPL(screen_glyph);
4246
4247 /* used by vcs - note the word offset */
4248 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4249 {
4250         return screenpos(vc, 2 * w_offset, viewed);
4251 }
4252 EXPORT_SYMBOL_GPL(screen_pos);
4253
4254 void getconsxy(struct vc_data *vc, unsigned char *p)
4255 {
4256         p[0] = vc->vc_x;
4257         p[1] = vc->vc_y;
4258 }
4259
4260 void putconsxy(struct vc_data *vc, unsigned char *p)
4261 {
4262         hide_cursor(vc);
4263         gotoxy(vc, p[0], p[1]);
4264         set_cursor(vc);
4265 }
4266
4267 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4268 {
4269         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4270                 return softcursor_original;
4271         return scr_readw(org);
4272 }
4273
4274 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4275 {
4276         scr_writew(val, org);
4277         if ((unsigned long)org == vc->vc_pos) {
4278                 softcursor_original = -1;
4279                 add_softcursor(vc);
4280         }
4281 }
4282
4283 void vcs_scr_updated(struct vc_data *vc)
4284 {
4285         notify_update(vc);
4286 }
4287
4288 /*
4289  *      Visible symbols for modules
4290  */
4291
4292 EXPORT_SYMBOL(color_table);
4293 EXPORT_SYMBOL(default_red);
4294 EXPORT_SYMBOL(default_grn);
4295 EXPORT_SYMBOL(default_blu);
4296 EXPORT_SYMBOL(update_region);
4297 EXPORT_SYMBOL(redraw_screen);
4298 EXPORT_SYMBOL(vc_resize);
4299 EXPORT_SYMBOL(fg_console);
4300 EXPORT_SYMBOL(console_blank_hook);
4301 EXPORT_SYMBOL(console_blanked);
4302 EXPORT_SYMBOL(vc_cons);
4303 EXPORT_SYMBOL(global_cursor_default);
4304 #ifndef VT_SINGLE_DRIVER
4305 EXPORT_SYMBOL(give_up_console);
4306 #endif