drivers/char/vt.c

   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton
  63  *
  64  * Removed console_lock, enabled interrupts across all console operations
  65  * 13 March 2001, Andrew Morton
  66  *
  67  * Fixed UTF-8 mode so alternate charset modes always work according
  68  * to control sequences interpreted in do_con_trol function
  69  * preserving backward VT100 semigraphics compatibility,
  70  * malformed UTF sequences represented as sequences of replacement glyphs,
  71  * original codes or '?' as a last resort if replacement glyph is undefined
  72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  73  */
  74
  75 #include <linux/module.h>
  76 #include <linux/types.h>
  77 #include <linux/sched.h>
  78 #include <linux/tty.h>
  79 #include <linux/tty_flip.h>
  80 #include <linux/kernel.h>
  81 #include <linux/string.h>
  82 #include <linux/errno.h>
  83 #include <linux/kd.h>
  84 #include <linux/slab.h>
  85 #include <linux/major.h>
  86 #include <linux/mm.h>
  87 #include <linux/console.h>
  88 #include <linux/init.h>
  89 #include <linux/mutex.h>
  90 #include <linux/vt_kern.h>
  91 #include <linux/selection.h>
  92 #include <linux/smp_lock.h>
  93 #include <linux/tiocl.h>
  94 #include <linux/kbd_kern.h>
  95 #include <linux/consolemap.h>
  96 #include <linux/timer.h>
  97 #include <linux/interrupt.h>
  98 #include <linux/workqueue.h>
  99 #include <linux/pm.h>
 100 #include <linux/font.h>
 101 #include <linux/bitops.h>
 102 #include <linux/notifier.h>
 103 #include <linux/device.h>
 104 #include <linux/io.h>
 105 #include <asm/system.h>
 106 #include <linux/uaccess.h>
 107
 108 #define MAX_NR_CON_DRIVER 16
 109
 110 #define CON_DRIVER_FLAG_MODULE 1
 111 #define CON_DRIVER_FLAG_INIT   2
 112 #define CON_DRIVER_FLAG_ATTR   4
 113
 114 struct con_driver {
 115         const struct consw *con;
 116         const char *desc;
 117         struct device *dev;
 118         int node;
 119         int first;
 120         int last;
 121         int flag;
 122 };
 123
 124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 125 const struct consw *conswitchp;
 126
 127 /* A bitmap for codes <32. A bit of 1 indicates that the code
 128  * corresponding to that bit number invokes some special action
 129  * (such as cursor movement) and should not be displayed as a
 130  * glyph unless the disp_ctrl mode is explicitly enabled.
 131  */
 132 #define CTRL_ACTION 0x0d00ff81
 133 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 134
 135 /*
 136  * Here is the default bell parameters: 750HZ, 1/8th of a second
 137  */
 138 #define DEFAULT_BELL_PITCH      750
 139 #define DEFAULT_BELL_DURATION   (HZ/8)
 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 blank_screen_t(unsigned long dummy);
 159 static void set_palette(struct vc_data *vc);
 160
 161 static int printable;           /* Is console ready for printing? */
 162 int default_utf8 = true;
 163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 164 int global_cursor_default = -1;
 165 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 166
 167 /*
 168  * ignore_poke: don't unblank the screen when things are typed.  This is
 169  * mainly for the privacy of braille terminal users.
 170  */
 171 static int ignore_poke;
 172
 173 int do_poke_blanked_console;
 174 int console_blanked;
 175
 176 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 177 static int vesa_off_interval;
 178 static int blankinterval = 10*60;
 179 core_param(consoleblank, blankinterval, int, 0444);
 180
 181 static DECLARE_WORK(console_work, console_callback);
 182
 183 /*
 184  * fg_console is the current virtual console,
 185  * last_console is the last used one,
 186  * want_console is the console we want to switch to,
 187  */
 188 int fg_console;
 189 int last_console;
 190 int want_console = -1;
 191
 192 /*
 193  * For each existing display, we have a pointer to console currently visible
 194  * on that display, allowing consoles other than fg_console to be refreshed
 195  * appropriately. Unless the low-level driver supplies its own display_fg
 196  * variable, we use this one for the "master display".
 197  */
 198 static struct vc_data *master_display_fg;
 199
 200 /*
 201  * Unfortunately, we need to delay tty echo when we're currently writing to the
 202  * console since the code is (and always was) not re-entrant, so we schedule
 203  * all flip requests to process context with schedule-task() and run it from
 204  * console_callback().
 205  */
 206
 207 /*
 208  * For the same reason, we defer scrollback to the console callback.
 209  */
 210 static int scrollback_delta;
 211
 212 /*
 213  * Hook so that the power management routines can (un)blank
 214  * the console on our behalf.
 215  */
 216 int (*console_blank_hook)(int);
 217
 218 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 219 static int blank_state;
 220 static int blank_timer_expired;
 221 enum {
 222         blank_off = 0,
 223         blank_normal_wait,
 224         blank_vesa_wait,
 225 };
 226
 227 /*
 228  * Notifier list for console events.
 229  */
 230 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 231
 232 int register_vt_notifier(struct notifier_block *nb)
 233 {
 234         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 235 }
 236 EXPORT_SYMBOL_GPL(register_vt_notifier);
 237
 238 int unregister_vt_notifier(struct notifier_block *nb)
 239 {
 240         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 241 }
 242 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 243
 244 static void notify_write(struct vc_data *vc, unsigned int unicode)
 245 {
 246         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 247         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 248 }
 249
 250 static void notify_update(struct vc_data *vc)
 251 {
 252         struct vt_notifier_param param = { .vc = vc };
 253         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 254 }
 255 /*
 256  *      Low-Level Functions
 257  */
 258
 259 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 260
 261 #ifdef VT_BUF_VRAM_ONLY
 262 #define DO_UPDATE(vc)   0
 263 #else
 264 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 265 #endif
 266
 267 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 268 {
 269         unsigned short *p;
 270
 271         if (!viewed)
 272                 p = (unsigned short *)(vc->vc_origin + offset);
 273         else if (!vc->vc_sw->con_screen_pos)
 274                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 275         else
 276                 p = vc->vc_sw->con_screen_pos(vc, offset);
 277         return p;
 278 }
 279
 280 static inline void scrolldelta(int lines)
 281 {
 282         scrollback_delta += lines;
 283         schedule_console_callback();
 284 }
 285
 286 void schedule_console_callback(void)
 287 {
 288         schedule_work(&console_work);
 289 }
 290
 291 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 292 {
 293         unsigned short *d, *s;
 294
 295         if (t+nr >= b)
 296                 nr = b - t - 1;
 297         if (b > vc->vc_rows || t >= b || nr < 1)
 298                 return;
 299         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 300                 return;
 301         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 302         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 303         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 304         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 305                     vc->vc_size_row * nr);
 306 }
 307
 308 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 309 {
 310         unsigned short *s;
 311         unsigned int step;
 312
 313         if (t+nr >= b)
 314                 nr = b - t - 1;
 315         if (b > vc->vc_rows || t >= b || nr < 1)
 316                 return;
 317         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 318                 return;
 319         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 320         step = vc->vc_cols * nr;
 321         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 322         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 323 }
 324
 325 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 326 {
 327 #ifndef VT_BUF_VRAM_ONLY
 328         unsigned int xx, yy, offset;
 329         u16 *p;
 330
 331         p = (u16 *) start;
 332         if (!vc->vc_sw->con_getxy) {
 333                 offset = (start - vc->vc_origin) / 2;
 334                 xx = offset % vc->vc_cols;
 335                 yy = offset / vc->vc_cols;
 336         } else {
 337                 int nxx, nyy;
 338                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 339                 xx = nxx; yy = nyy;
 340         }
 341         for(;;) {
 342                 u16 attrib = scr_readw(p) & 0xff00;
 343                 int startx = xx;
 344                 u16 *q = p;
 345                 while (xx < vc->vc_cols && count) {
 346                         if (attrib != (scr_readw(p) & 0xff00)) {
 347                                 if (p > q)
 348                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 349                                 startx = xx;
 350                                 q = p;
 351                                 attrib = scr_readw(p) & 0xff00;
 352                         }
 353                         p++;
 354                         xx++;
 355                         count--;
 356                 }
 357                 if (p > q)
 358                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 359                 if (!count)
 360                         break;
 361                 xx = 0;
 362                 yy++;
 363                 if (vc->vc_sw->con_getxy) {
 364                         p = (u16 *)start;
 365                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 366                 }
 367         }
 368 #endif
 369 }
 370
 371 void update_region(struct vc_data *vc, unsigned long start, int count)
 372 {
 373         WARN_CONSOLE_UNLOCKED();
 374
 375         if (DO_UPDATE(vc)) {
 376                 hide_cursor(vc);
 377                 do_update_region(vc, start, count);
 378                 set_cursor(vc);
 379         }
 380 }
 381
 382 /* Structure of attributes is hardware-dependent */
 383
 384 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 385     u8 _underline, u8 _reverse, u8 _italic)
 386 {
 387         if (vc->vc_sw->con_build_attr)
 388                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 389                        _blink, _underline, _reverse, _italic);
 390
 391 #ifndef VT_BUF_VRAM_ONLY
 392 /*
 393  * ++roman: I completely changed the attribute format for monochrome
 394  * mode (!can_do_color). The formerly used MDA (monochrome display
 395  * adapter) format didn't allow the combination of certain effects.
 396  * Now the attribute is just a bit vector:
 397  *  Bit 0..1: intensity (0..2)
 398  *  Bit 2   : underline
 399  *  Bit 3   : reverse
 400  *  Bit 7   : blink
 401  */
 402         {
 403         u8 a = _color;
 404         if (!vc->vc_can_do_color)
 405                 return _intensity |
 406                        (_italic ? 2 : 0) |
 407                        (_underline ? 4 : 0) |
 408                        (_reverse ? 8 : 0) |
 409                        (_blink ? 0x80 : 0);
 410         if (_italic)
 411                 a = (a & 0xF0) | vc->vc_itcolor;
 412         else if (_underline)
 413                 a = (a & 0xf0) | vc->vc_ulcolor;
 414         else if (_intensity == 0)
 415                 a = (a & 0xf0) | vc->vc_ulcolor;
 416         if (_reverse)
 417                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 418         if (_blink)
 419                 a ^= 0x80;
 420         if (_intensity == 2)
 421                 a ^= 0x08;
 422         if (vc->vc_hi_font_mask == 0x100)
 423                 a <<= 1;
 424         return a;
 425         }
 426 #else
 427         return 0;
 428 #endif
 429 }
 430
 431 static void update_attr(struct vc_data *vc)
 432 {
 433         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 434                       vc->vc_blink, vc->vc_underline,
 435                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 436         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 437 }
 438
 439 /* Note: inverting the screen twice should revert to the original state */
 440 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 441 {
 442         unsigned short *p;
 443
 444         WARN_CONSOLE_UNLOCKED();
 445
 446         count /= 2;
 447         p = screenpos(vc, offset, viewed);
 448         if (vc->vc_sw->con_invert_region)
 449                 vc->vc_sw->con_invert_region(vc, p, count);
 450 #ifndef VT_BUF_VRAM_ONLY
 451         else {
 452                 u16 *q = p;
 453                 int cnt = count;
 454                 u16 a;
 455
 456                 if (!vc->vc_can_do_color) {
 457                         while (cnt--) {
 458                             a = scr_readw(q);
 459                             a ^= 0x0800;
 460                             scr_writew(a, q);
 461                             q++;
 462                         }
 463                 } else if (vc->vc_hi_font_mask == 0x100) {
 464                         while (cnt--) {
 465                                 a = scr_readw(q);
 466                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 467                                 scr_writew(a, q);
 468                                 q++;
 469                         }
 470                 } else {
 471                         while (cnt--) {
 472                                 a = scr_readw(q);
 473                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 474                                 scr_writew(a, q);
 475                                 q++;
 476                         }
 477                 }
 478         }
 479 #endif
 480         if (DO_UPDATE(vc))
 481                 do_update_region(vc, (unsigned long) p, count);
 482 }
 483
 484 /* used by selection: complement pointer position */
 485 void complement_pos(struct vc_data *vc, int offset)
 486 {
 487         static int old_offset = -1;
 488         static unsigned short old;
 489         static unsigned short oldx, oldy;
 490
 491         WARN_CONSOLE_UNLOCKED();
 492
 493         if (old_offset != -1 && old_offset >= 0 &&
 494             old_offset < vc->vc_screenbuf_size) {
 495                 scr_writew(old, screenpos(vc, old_offset, 1));
 496                 if (DO_UPDATE(vc))
 497                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 498         }
 499
 500         old_offset = offset;
 501
 502         if (offset != -1 && offset >= 0 &&
 503             offset < vc->vc_screenbuf_size) {
 504                 unsigned short new;
 505                 unsigned short *p;
 506                 p = screenpos(vc, offset, 1);
 507                 old = scr_readw(p);
 508                 new = old ^ vc->vc_complement_mask;
 509                 scr_writew(new, p);
 510                 if (DO_UPDATE(vc)) {
 511                         oldx = (offset >> 1) % vc->vc_cols;
 512                         oldy = (offset >> 1) / vc->vc_cols;
 513                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 514                 }
 515         }
 516
 517 }
 518
 519 static void insert_char(struct vc_data *vc, unsigned int nr)
 520 {
 521         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 522
 523         p = q + vc->vc_cols - nr - vc->vc_x;
 524         while (--p >= q)
 525                 scr_writew(scr_readw(p), p + nr);
 526         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 527         vc->vc_need_wrap = 0;
 528         if (DO_UPDATE(vc)) {
 529                 unsigned short oldattr = vc->vc_attr;
 530                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 531                                      vc->vc_cols - vc->vc_x - nr);
 532                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 533                 while (nr--)
 534                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 535                 vc->vc_attr = oldattr;
 536         }
 537 }
 538
 539 static void delete_char(struct vc_data *vc, unsigned int nr)
 540 {
 541         unsigned int i = vc->vc_x;
 542         unsigned short *p = (unsigned short *)vc->vc_pos;
 543
 544         while (++i <= vc->vc_cols - nr) {
 545                 scr_writew(scr_readw(p+nr), p);
 546                 p++;
 547         }
 548         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 549         vc->vc_need_wrap = 0;
 550         if (DO_UPDATE(vc)) {
 551                 unsigned short oldattr = vc->vc_attr;
 552                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 553                                      vc->vc_cols - vc->vc_x - nr);
 554                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 555                 while (nr--)
 556                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 557                                      vc->vc_cols - 1 - nr);
 558                 vc->vc_attr = oldattr;
 559         }
 560 }
 561
 562 static int softcursor_original;
 563
 564 static void add_softcursor(struct vc_data *vc)
 565 {
 566         int i = scr_readw((u16 *) vc->vc_pos);
 567         u32 type = vc->vc_cursor_type;
 568
 569         if (! (type & 0x10)) return;
 570         if (softcursor_original != -1) return;
 571         softcursor_original = i;
 572         i |= ((type >> 8) & 0xff00 );
 573         i ^= ((type) & 0xff00 );
 574         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 575         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 576         scr_writew(i, (u16 *) vc->vc_pos);
 577         if (DO_UPDATE(vc))
 578                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 579 }
 580
 581 static void hide_softcursor(struct vc_data *vc)
 582 {
 583         if (softcursor_original != -1) {
 584                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 585                 if (DO_UPDATE(vc))
 586                         vc->vc_sw->con_putc(vc, softcursor_original,
 587                                         vc->vc_y, vc->vc_x);
 588                 softcursor_original = -1;
 589         }
 590 }
 591
 592 static void hide_cursor(struct vc_data *vc)
 593 {
 594         if (vc == sel_cons)
 595                 clear_selection();
 596         vc->vc_sw->con_cursor(vc, CM_ERASE);
 597         hide_softcursor(vc);
 598 }
 599
 600 static void set_cursor(struct vc_data *vc)
 601 {
 602         if (!IS_FG(vc) || console_blanked ||
 603             vc->vc_mode == KD_GRAPHICS)
 604                 return;
 605         if (vc->vc_deccm) {
 606                 if (vc == sel_cons)
 607                         clear_selection();
 608                 add_softcursor(vc);
 609                 if ((vc->vc_cursor_type & 0x0f) != 1)
 610                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 611         } else
 612                 hide_cursor(vc);
 613 }
 614
 615 static void set_origin(struct vc_data *vc)
 616 {
 617         WARN_CONSOLE_UNLOCKED();
 618
 619         if (!CON_IS_VISIBLE(vc) ||
 620             !vc->vc_sw->con_set_origin ||
 621             !vc->vc_sw->con_set_origin(vc))
 622                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 623         vc->vc_visible_origin = vc->vc_origin;
 624         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 625         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 626 }
 627
 628 static inline void save_screen(struct vc_data *vc)
 629 {
 630         WARN_CONSOLE_UNLOCKED();
 631
 632         if (vc->vc_sw->con_save_screen)
 633                 vc->vc_sw->con_save_screen(vc);
 634 }
 635
 636 /*
 637  *      Redrawing of screen
 638  */
 639
 640 static void clear_buffer_attributes(struct vc_data *vc)
 641 {
 642         unsigned short *p = (unsigned short *)vc->vc_origin;
 643         int count = vc->vc_screenbuf_size / 2;
 644         int mask = vc->vc_hi_font_mask | 0xff;
 645
 646         for (; count > 0; count--, p++) {
 647                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 648         }
 649 }
 650
 651 void redraw_screen(struct vc_data *vc, int is_switch)
 652 {
 653         int redraw = 0;
 654
 655         WARN_CONSOLE_UNLOCKED();
 656
 657         if (!vc) {
 658                 /* strange ... */
 659                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 660                 return;
 661         }
 662
 663         if (is_switch) {
 664                 struct vc_data *old_vc = vc_cons[fg_console].d;
 665                 if (old_vc == vc)
 666                         return;
 667                 if (!CON_IS_VISIBLE(vc))
 668                         redraw = 1;
 669                 *vc->vc_display_fg = vc;
 670                 fg_console = vc->vc_num;
 671                 hide_cursor(old_vc);
 672                 if (!CON_IS_VISIBLE(old_vc)) {
 673                         save_screen(old_vc);
 674                         set_origin(old_vc);
 675                 }
 676         } else {
 677                 hide_cursor(vc);
 678                 redraw = 1;
 679         }
 680
 681         if (redraw) {
 682                 int update;
 683                 int old_was_color = vc->vc_can_do_color;
 684
 685                 set_origin(vc);
 686                 update = vc->vc_sw->con_switch(vc);
 687                 set_palette(vc);
 688                 /*
 689                  * If console changed from mono<->color, the best we can do
 690                  * is to clear the buffer attributes. As it currently stands,
 691                  * rebuilding new attributes from the old buffer is not doable
 692                  * without overly complex code.
 693                  */
 694                 if (old_was_color != vc->vc_can_do_color) {
 695                         update_attr(vc);
 696                         clear_buffer_attributes(vc);
 697                 }
 698                 if (update && vc->vc_mode != KD_GRAPHICS)
 699                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 700         }
 701         set_cursor(vc);
 702         if (is_switch) {
 703                 set_leds();
 704                 compute_shiftstate();
 705                 notify_update(vc);
 706         }
 707 }
 708
 709 /*
 710  *      Allocation, freeing and resizing of VTs.
 711  */
 712
 713 int vc_cons_allocated(unsigned int i)
 714 {
 715         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 716 }
 717
 718 static void visual_init(struct vc_data *vc, int num, int init)
 719 {
 720         /* ++Geert: vc->vc_sw->con_init determines console size */
 721         if (vc->vc_sw)
 722                 module_put(vc->vc_sw->owner);
 723         vc->vc_sw = conswitchp;
 724 #ifndef VT_SINGLE_DRIVER
 725         if (con_driver_map[num])
 726                 vc->vc_sw = con_driver_map[num];
 727 #endif
 728         __module_get(vc->vc_sw->owner);
 729         vc->vc_num = num;
 730         vc->vc_display_fg = &master_display_fg;
 731         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 732         vc->vc_uni_pagedir = 0;
 733         vc->vc_hi_font_mask = 0;
 734         vc->vc_complement_mask = 0;
 735         vc->vc_can_do_color = 0;
 736         vc->vc_sw->con_init(vc, init);
 737         if (!vc->vc_complement_mask)
 738                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 739         vc->vc_s_complement_mask = vc->vc_complement_mask;
 740         vc->vc_size_row = vc->vc_cols << 1;
 741         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 742 }
 743
 744 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 745 {
 746         WARN_CONSOLE_UNLOCKED();
 747
 748         if (currcons >= MAX_NR_CONSOLES)
 749                 return -ENXIO;
 750         if (!vc_cons[currcons].d) {
 751             struct vc_data *vc;
 752             struct vt_notifier_param param;
 753
 754             /* prevent users from taking too much memory */
 755             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 756               return -EPERM;
 757
 758             /* due to the granularity of kmalloc, we waste some memory here */
 759             /* the alloc is done in two steps, to optimize the common situation
 760                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 761             /* although the numbers above are not valid since long ago, the
 762                point is still up-to-date and the comment still has its value
 763                even if only as a historical artifact.  --mj, July 1998 */
 764             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 765             if (!vc)
 766                 return -ENOMEM;
 767             vc_cons[currcons].d = vc;
 768             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 769             visual_init(vc, currcons, 1);
 770             if (!*vc->vc_uni_pagedir_loc)
 771                 con_set_default_unimap(vc);
 772             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 773             if (!vc->vc_screenbuf) {
 774                 kfree(vc);
 775                 vc_cons[currcons].d = NULL;
 776                 return -ENOMEM;
 777             }
 778
 779             /* If no drivers have overridden us and the user didn't pass a
 780                boot option, default to displaying the cursor */
 781             if (global_cursor_default == -1)
 782                     global_cursor_default = 1;
 783
 784             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 785             vcs_make_sysfs(currcons);
 786             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 787         }
 788         return 0;
 789 }
 790
 791 static inline int resize_screen(struct vc_data *vc, int width, int height,
 792                                 int user)
 793 {
 794         /* Resizes the resolution of the display adapater */
 795         int err = 0;
 796
 797         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 798                 err = vc->vc_sw->con_resize(vc, width, height, user);
 799
 800         return err;
 801 }
 802
 803 /*
 804  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 805  * [this is to be used together with some user program
 806  * like resize that changes the hardware videomode]
 807  */
 808 #define VC_RESIZE_MAXCOL (32767)
 809 #define VC_RESIZE_MAXROW (32767)
 810
 811 /**
 812  *      vc_do_resize    -       resizing method for the tty
 813  *      @tty: tty being resized
 814  *      @real_tty: real tty (different to tty if a pty/tty pair)
 815  *      @vc: virtual console private data
 816  *      @cols: columns
 817  *      @lines: lines
 818  *
 819  *      Resize a virtual console, clipping according to the actual constraints.
 820  *      If the caller passes a tty structure then update the termios winsize
 821  *      information and perform any neccessary signal handling.
 822  *
 823  *      Caller must hold the console semaphore. Takes the termios mutex and
 824  *      ctrl_lock of the tty IFF a tty is passed.
 825  */
 826
 827 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 828                                 unsigned int cols, unsigned int lines)
 829 {
 830         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 831         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 832         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 833         unsigned int end, user;
 834         unsigned short *newscreen;
 835
 836         WARN_CONSOLE_UNLOCKED();
 837
 838         if (!vc)
 839                 return -ENXIO;
 840
 841         user = vc->vc_resize_user;
 842         vc->vc_resize_user = 0;
 843
 844         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 845                 return -EINVAL;
 846
 847         new_cols = (cols ? cols : vc->vc_cols);
 848         new_rows = (lines ? lines : vc->vc_rows);
 849         new_row_size = new_cols << 1;
 850         new_screen_size = new_row_size * new_rows;
 851
 852         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 853                 return 0;
 854
 855         newscreen = kmalloc(new_screen_size, GFP_USER);
 856         if (!newscreen)
 857                 return -ENOMEM;
 858
 859         old_rows = vc->vc_rows;
 860         old_cols = vc->vc_cols;
 861         old_row_size = vc->vc_size_row;
 862         old_screen_size = vc->vc_screenbuf_size;
 863
 864         err = resize_screen(vc, new_cols, new_rows, user);
 865         if (err) {
 866                 kfree(newscreen);
 867                 return err;
 868         }
 869
 870         vc->vc_rows = new_rows;
 871         vc->vc_cols = new_cols;
 872         vc->vc_size_row = new_row_size;
 873         vc->vc_screenbuf_size = new_screen_size;
 874
 875         rlth = min(old_row_size, new_row_size);
 876         rrem = new_row_size - rlth;
 877         old_origin = vc->vc_origin;
 878         new_origin = (long) newscreen;
 879         new_scr_end = new_origin + new_screen_size;
 880
 881         if (vc->vc_y > new_rows) {
 882                 if (old_rows - vc->vc_y < new_rows) {
 883                         /*
 884                          * Cursor near the bottom, copy contents from the
 885                          * bottom of buffer
 886                          */
 887                         old_origin += (old_rows - new_rows) * old_row_size;
 888                         end = vc->vc_scr_end;
 889                 } else {
 890                         /*
 891                          * Cursor is in no man's land, copy 1/2 screenful
 892                          * from the top and bottom of cursor position
 893                          */
 894                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 895                         end = old_origin + (old_row_size * new_rows);
 896                 }
 897         } else
 898                 /*
 899                  * Cursor near the top, copy contents from the top of buffer
 900                  */
 901                 end = (old_rows > new_rows) ? old_origin +
 902                         (old_row_size * new_rows) :
 903                         vc->vc_scr_end;
 904
 905         update_attr(vc);
 906
 907         while (old_origin < end) {
 908                 scr_memcpyw((unsigned short *) new_origin,
 909                             (unsigned short *) old_origin, rlth);
 910                 if (rrem)
 911                         scr_memsetw((void *)(new_origin + rlth),
 912                                     vc->vc_video_erase_char, rrem);
 913                 old_origin += old_row_size;
 914                 new_origin += new_row_size;
 915         }
 916         if (new_scr_end > new_origin)
 917                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 918                             new_scr_end - new_origin);
 919         kfree(vc->vc_screenbuf);
 920         vc->vc_screenbuf = newscreen;
 921         vc->vc_screenbuf_size = new_screen_size;
 922         set_origin(vc);
 923
 924         /* do part of a reset_terminal() */
 925         vc->vc_top = 0;
 926         vc->vc_bottom = vc->vc_rows;
 927         gotoxy(vc, vc->vc_x, vc->vc_y);
 928         save_cur(vc);
 929
 930         if (tty) {
 931                 /* Rewrite the requested winsize data with the actual
 932                    resulting sizes */
 933                 struct winsize ws;
 934                 memset(&ws, 0, sizeof(ws));
 935                 ws.ws_row = vc->vc_rows;
 936                 ws.ws_col = vc->vc_cols;
 937                 ws.ws_ypixel = vc->vc_scan_lines;
 938                 tty_do_resize(tty, &ws);
 939         }
 940
 941         if (CON_IS_VISIBLE(vc))
 942                 update_screen(vc);
 943         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 944         return err;
 945 }
 946
 947 /**
 948  *      vc_resize               -       resize a VT
 949  *      @vc: virtual console
 950  *      @cols: columns
 951  *      @rows: rows
 952  *
 953  *      Resize a virtual console as seen from the console end of things. We
 954  *      use the common vc_do_resize methods to update the structures. The
 955  *      caller must hold the console sem to protect console internals and
 956  *      vc->vc_tty
 957  */
 958
 959 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 960 {
 961         return vc_do_resize(vc->vc_tty, vc, cols, rows);
 962 }
 963
 964 /**
 965  *      vt_resize               -       resize a VT
 966  *      @tty: tty to resize
 967  *      @ws: winsize attributes
 968  *
 969  *      Resize a virtual terminal. This is called by the tty layer as we
 970  *      register our own handler for resizing. The mutual helper does all
 971  *      the actual work.
 972  *
 973  *      Takes the console sem and the called methods then take the tty
 974  *      termios_mutex and the tty ctrl_lock in that order.
 975  */
 976 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 977 {
 978         struct vc_data *vc = tty->driver_data;
 979         int ret;
 980
 981         acquire_console_sem();
 982         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 983         release_console_sem();
 984         return ret;
 985 }
 986
 987 void vc_deallocate(unsigned int currcons)
 988 {
 989         WARN_CONSOLE_UNLOCKED();
 990
 991         if (vc_cons_allocated(currcons)) {
 992                 struct vc_data *vc = vc_cons[currcons].d;
 993                 struct vt_notifier_param param = { .vc = vc };
 994
 995                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 996                 vcs_remove_sysfs(currcons);
 997                 vc->vc_sw->con_deinit(vc);
 998                 put_pid(vc->vt_pid);
 999                 module_put(vc->vc_sw->owner);
1000                 kfree(vc->vc_screenbuf);
1001                 if (currcons >= MIN_NR_CONSOLES)
1002                         kfree(vc);
1003                 vc_cons[currcons].d = NULL;
1004         }
1005 }
1006
1007 /*
1008  *      VT102 emulator
1009  */
1010
1011 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1012 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1013 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1014
1015 #define decarm          VC_REPEAT
1016 #define decckm          VC_CKMODE
1017 #define kbdapplic       VC_APPLIC
1018 #define lnm             VC_CRLF
1019
1020 /*
1021  * this is what the terminal answers to a ESC-Z or csi0c query.
1022  */
1023 #define VT100ID "\033[?1;2c"
1024 #define VT102ID "\033[?6c"
1025
1026 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1027                                        8,12,10,14, 9,13,11,15 };
1028
1029 /* the default colour table, for VGA+ colour systems */
1030 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1031     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1032 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1033     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1034 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1035     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1036
1037 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1038 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1039 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1040
1041 /*
1042  * gotoxy() must verify all boundaries, because the arguments
1043  * might also be negative. If the given position is out of
1044  * bounds, the cursor is placed at the nearest margin.
1045  */
1046 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1047 {
1048         int min_y, max_y;
1049
1050         if (new_x < 0)
1051                 vc->vc_x = 0;
1052         else {
1053                 if (new_x >= vc->vc_cols)
1054                         vc->vc_x = vc->vc_cols - 1;
1055                 else
1056                         vc->vc_x = new_x;
1057         }
1058
1059         if (vc->vc_decom) {
1060                 min_y = vc->vc_top;
1061                 max_y = vc->vc_bottom;
1062         } else {
1063                 min_y = 0;
1064                 max_y = vc->vc_rows;
1065         }
1066         if (new_y < min_y)
1067                 vc->vc_y = min_y;
1068         else if (new_y >= max_y)
1069                 vc->vc_y = max_y - 1;
1070         else
1071                 vc->vc_y = new_y;
1072         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1073         vc->vc_need_wrap = 0;
1074 }
1075
1076 /* for absolute user moves, when decom is set */
1077 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1078 {
1079         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1080 }
1081
1082 void scrollback(struct vc_data *vc, int lines)
1083 {
1084         if (!lines)
1085                 lines = vc->vc_rows / 2;
1086         scrolldelta(-lines);
1087 }
1088
1089 void scrollfront(struct vc_data *vc, int lines)
1090 {
1091         if (!lines)
1092                 lines = vc->vc_rows / 2;
1093         scrolldelta(lines);
1094 }
1095
1096 static void lf(struct vc_data *vc)
1097 {
1098         /* don't scroll if above bottom of scrolling region, or
1099          * if below scrolling region
1100          */
1101         if (vc->vc_y + 1 == vc->vc_bottom)
1102                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1103         else if (vc->vc_y < vc->vc_rows - 1) {
1104                 vc->vc_y++;
1105                 vc->vc_pos += vc->vc_size_row;
1106         }
1107         vc->vc_need_wrap = 0;
1108         notify_write(vc, '\n');
1109 }
1110
1111 static void ri(struct vc_data *vc)
1112 {
1113         /* don't scroll if below top of scrolling region, or
1114          * if above scrolling region
1115          */
1116         if (vc->vc_y == vc->vc_top)
1117                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1118         else if (vc->vc_y > 0) {
1119                 vc->vc_y--;
1120                 vc->vc_pos -= vc->vc_size_row;
1121         }
1122         vc->vc_need_wrap = 0;
1123 }
1124
1125 static inline void cr(struct vc_data *vc)
1126 {
1127         vc->vc_pos -= vc->vc_x << 1;
1128         vc->vc_need_wrap = vc->vc_x = 0;
1129         notify_write(vc, '\r');
1130 }
1131
1132 static inline void bs(struct vc_data *vc)
1133 {
1134         if (vc->vc_x) {
1135                 vc->vc_pos -= 2;
1136                 vc->vc_x--;
1137                 vc->vc_need_wrap = 0;
1138                 notify_write(vc, '\b');
1139         }
1140 }
1141
1142 static inline void del(struct vc_data *vc)
1143 {
1144         /* ignored */
1145 }
1146
1147 static void csi_J(struct vc_data *vc, int vpar)
1148 {
1149         unsigned int count;
1150         unsigned short * start;
1151
1152         switch (vpar) {
1153                 case 0: /* erase from cursor to end of display */
1154                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1155                         start = (unsigned short *)vc->vc_pos;
1156                         if (DO_UPDATE(vc)) {
1157                                 /* do in two stages */
1158                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1159                                               vc->vc_cols - vc->vc_x);
1160                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1161                                               vc->vc_rows - vc->vc_y - 1,
1162                                               vc->vc_cols);
1163                         }
1164                         break;
1165                 case 1: /* erase from start to cursor */
1166                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1167                         start = (unsigned short *)vc->vc_origin;
1168                         if (DO_UPDATE(vc)) {
1169                                 /* do in two stages */
1170                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1171                                               vc->vc_cols);
1172                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1173                                               vc->vc_x + 1);
1174                         }
1175                         break;
1176                 case 2: /* erase whole display */
1177                         count = vc->vc_cols * vc->vc_rows;
1178                         start = (unsigned short *)vc->vc_origin;
1179                         if (DO_UPDATE(vc))
1180                                 vc->vc_sw->con_clear(vc, 0, 0,
1181                                               vc->vc_rows,
1182                                               vc->vc_cols);
1183                         break;
1184                 default:
1185                         return;
1186         }
1187         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1188         vc->vc_need_wrap = 0;
1189 }
1190
1191 static void csi_K(struct vc_data *vc, int vpar)
1192 {
1193         unsigned int count;
1194         unsigned short * start;
1195
1196         switch (vpar) {
1197                 case 0: /* erase from cursor to end of line */
1198                         count = vc->vc_cols - vc->vc_x;
1199                         start = (unsigned short *)vc->vc_pos;
1200                         if (DO_UPDATE(vc))
1201                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1202                                                      vc->vc_cols - vc->vc_x);
1203                         break;
1204                 case 1: /* erase from start of line to cursor */
1205                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1206                         count = vc->vc_x + 1;
1207                         if (DO_UPDATE(vc))
1208                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1209                                                      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                         if (DO_UPDATE(vc))
1215                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1216                                               vc->vc_cols);
1217                         break;
1218                 default:
1219                         return;
1220         }
1221         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1222         vc->vc_need_wrap = 0;
1223 }
1224
1225 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1226 {                                         /* not vt100? */
1227         int count;
1228
1229         if (!vpar)
1230                 vpar++;
1231         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1232
1233         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1234         if (DO_UPDATE(vc))
1235                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1236         vc->vc_need_wrap = 0;
1237 }
1238
1239 static void default_attr(struct vc_data *vc)
1240 {
1241         vc->vc_intensity = 1;
1242         vc->vc_italic = 0;
1243         vc->vc_underline = 0;
1244         vc->vc_reverse = 0;
1245         vc->vc_blink = 0;
1246         vc->vc_color = vc->vc_def_color;
1247 }
1248
1249 /* console_sem is held */
1250 static void csi_m(struct vc_data *vc)
1251 {
1252         int i;
1253
1254         for (i = 0; i <= vc->vc_npar; i++)
1255                 switch (vc->vc_par[i]) {
1256                         case 0: /* all attributes off */
1257                                 default_attr(vc);
1258                                 break;
1259                         case 1:
1260                                 vc->vc_intensity = 2;
1261                                 break;
1262                         case 2:
1263                                 vc->vc_intensity = 0;
1264                                 break;
1265                         case 3:
1266                                 vc->vc_italic = 1;
1267                                 break;
1268                         case 4:
1269                                 vc->vc_underline = 1;
1270                                 break;
1271                         case 5:
1272                                 vc->vc_blink = 1;
1273                                 break;
1274                         case 7:
1275                                 vc->vc_reverse = 1;
1276                                 break;
1277                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1278                                   * Select primary font, don't display
1279                                   * control chars if defined, don't set
1280                                   * bit 8 on output.
1281                                   */
1282                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1283                                                 ? vc->vc_G0_charset
1284                                                 : vc->vc_G1_charset, vc);
1285                                 vc->vc_disp_ctrl = 0;
1286                                 vc->vc_toggle_meta = 0;
1287                                 break;
1288                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1289                                   * Select first alternate font, lets
1290                                   * chars < 32 be displayed as ROM chars.
1291                                   */
1292                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1293                                 vc->vc_disp_ctrl = 1;
1294                                 vc->vc_toggle_meta = 0;
1295                                 break;
1296                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1297                                   * Select second alternate font, toggle
1298                                   * high bit before displaying as ROM char.
1299                                   */
1300                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1301                                 vc->vc_disp_ctrl = 1;
1302                                 vc->vc_toggle_meta = 1;
1303                                 break;
1304                         case 21:
1305                         case 22:
1306                                 vc->vc_intensity = 1;
1307                                 break;
1308                         case 23:
1309                                 vc->vc_italic = 0;
1310                                 break;
1311                         case 24:
1312                                 vc->vc_underline = 0;
1313                                 break;
1314                         case 25:
1315                                 vc->vc_blink = 0;
1316                                 break;
1317                         case 27:
1318                                 vc->vc_reverse = 0;
1319                                 break;
1320                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1321                                   * Enables underscore, white foreground
1322                                   * with white underscore (Linux - use
1323                                   * default foreground).
1324                                   */
1325                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1326                                 vc->vc_underline = 1;
1327                                 break;
1328                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1329                                   * Disable underline option.
1330                                   * Reset colour to default? It did this
1331                                   * before...
1332                                   */
1333                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1334                                 vc->vc_underline = 0;
1335                                 break;
1336                         case 49:
1337                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1338                                 break;
1339                         default:
1340                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1341                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1342                                                 | (vc->vc_color & 0xf0);
1343                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1344                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1345                                                 | (vc->vc_color & 0x0f);
1346                                 break;
1347                 }
1348         update_attr(vc);
1349 }
1350
1351 static void respond_string(const char *p, struct tty_struct *tty)
1352 {
1353         while (*p) {
1354                 tty_insert_flip_char(tty, *p, 0);
1355                 p++;
1356         }
1357         con_schedule_flip(tty);
1358 }
1359
1360 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1361 {
1362         char buf[40];
1363
1364         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1365         respond_string(buf, tty);
1366 }
1367
1368 static inline void status_report(struct tty_struct *tty)
1369 {
1370         respond_string("\033[0n", tty); /* Terminal ok */
1371 }
1372
1373 static inline void respond_ID(struct tty_struct * tty)
1374 {
1375         respond_string(VT102ID, tty);
1376 }
1377
1378 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1379 {
1380         char buf[8];
1381
1382         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1383                 (char)('!' + mry));
1384         respond_string(buf, tty);
1385 }
1386
1387 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1388 int mouse_reporting(void)
1389 {
1390         return vc_cons[fg_console].d->vc_report_mouse;
1391 }
1392
1393 /* console_sem is held */
1394 static void set_mode(struct vc_data *vc, int on_off)
1395 {
1396         int i;
1397
1398         for (i = 0; i <= vc->vc_npar; i++)
1399                 if (vc->vc_ques) {
1400                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1401                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1402                                 if (on_off)
1403                                         set_kbd(vc, decckm);
1404                                 else
1405                                         clr_kbd(vc, decckm);
1406                                 break;
1407                         case 3: /* 80/132 mode switch unimplemented */
1408                                 vc->vc_deccolm = on_off;
1409 #if 0
1410                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1411                                 /* this alone does not suffice; some user mode
1412                                    utility has to change the hardware regs */
1413 #endif
1414                                 break;
1415                         case 5:                 /* Inverted screen on/off */
1416                                 if (vc->vc_decscnm != on_off) {
1417                                         vc->vc_decscnm = on_off;
1418                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1419                                         update_attr(vc);
1420                                 }
1421                                 break;
1422                         case 6:                 /* Origin relative/absolute */
1423                                 vc->vc_decom = on_off;
1424                                 gotoxay(vc, 0, 0);
1425                                 break;
1426                         case 7:                 /* Autowrap on/off */
1427                                 vc->vc_decawm = on_off;
1428                                 break;
1429                         case 8:                 /* Autorepeat on/off */
1430                                 if (on_off)
1431                                         set_kbd(vc, decarm);
1432                                 else
1433                                         clr_kbd(vc, decarm);
1434                                 break;
1435                         case 9:
1436                                 vc->vc_report_mouse = on_off ? 1 : 0;
1437                                 break;
1438                         case 25:                /* Cursor on/off */
1439                                 vc->vc_deccm = on_off;
1440                                 break;
1441                         case 1000:
1442                                 vc->vc_report_mouse = on_off ? 2 : 0;
1443                                 break;
1444                         }
1445                 } else {
1446                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1447                         case 3:                 /* Monitor (display ctrls) */
1448                                 vc->vc_disp_ctrl = on_off;
1449                                 break;
1450                         case 4:                 /* Insert Mode on/off */
1451                                 vc->vc_decim = on_off;
1452                                 break;
1453                         case 20:                /* Lf, Enter == CrLf/Lf */
1454                                 if (on_off)
1455                                         set_kbd(vc, lnm);
1456                                 else
1457                                         clr_kbd(vc, lnm);
1458                                 break;
1459                         }
1460                 }
1461 }
1462
1463 /* console_sem is held */
1464 static void setterm_command(struct vc_data *vc)
1465 {
1466         switch(vc->vc_par[0]) {
1467                 case 1: /* set color for underline mode */
1468                         if (vc->vc_can_do_color &&
1469                                         vc->vc_par[1] < 16) {
1470                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1471                                 if (vc->vc_underline)
1472                                         update_attr(vc);
1473                         }
1474                         break;
1475                 case 2: /* set color for half intensity mode */
1476                         if (vc->vc_can_do_color &&
1477                                         vc->vc_par[1] < 16) {
1478                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1479                                 if (vc->vc_intensity == 0)
1480                                         update_attr(vc);
1481                         }
1482                         break;
1483                 case 8: /* store colors as defaults */
1484                         vc->vc_def_color = vc->vc_attr;
1485                         if (vc->vc_hi_font_mask == 0x100)
1486                                 vc->vc_def_color >>= 1;
1487                         default_attr(vc);
1488                         update_attr(vc);
1489                         break;
1490                 case 9: /* set blanking interval */
1491                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1492                         poke_blanked_console();
1493                         break;
1494                 case 10: /* set bell frequency in Hz */
1495                         if (vc->vc_npar >= 1)
1496                                 vc->vc_bell_pitch = vc->vc_par[1];
1497                         else
1498                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1499                         break;
1500                 case 11: /* set bell duration in msec */
1501                         if (vc->vc_npar >= 1)
1502                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1503                                         vc->vc_par[1] * HZ / 1000 : 0;
1504                         else
1505                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1506                         break;
1507                 case 12: /* bring specified console to the front */
1508                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1509                                 set_console(vc->vc_par[1] - 1);
1510                         break;
1511                 case 13: /* unblank the screen */
1512                         poke_blanked_console();
1513                         break;
1514                 case 14: /* set vesa powerdown interval */
1515                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1516                         break;
1517                 case 15: /* activate the previous console */
1518                         set_console(last_console);
1519                         break;
1520         }
1521 }
1522
1523 /* console_sem is held */
1524 static void csi_at(struct vc_data *vc, unsigned int nr)
1525 {
1526         if (nr > vc->vc_cols - vc->vc_x)
1527                 nr = vc->vc_cols - vc->vc_x;
1528         else if (!nr)
1529                 nr = 1;
1530         insert_char(vc, nr);
1531 }
1532
1533 /* console_sem is held */
1534 static void csi_L(struct vc_data *vc, unsigned int nr)
1535 {
1536         if (nr > vc->vc_rows - vc->vc_y)
1537                 nr = vc->vc_rows - vc->vc_y;
1538         else if (!nr)
1539                 nr = 1;
1540         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1541         vc->vc_need_wrap = 0;
1542 }
1543
1544 /* console_sem is held */
1545 static void csi_P(struct vc_data *vc, unsigned int nr)
1546 {
1547         if (nr > vc->vc_cols - vc->vc_x)
1548                 nr = vc->vc_cols - vc->vc_x;
1549         else if (!nr)
1550                 nr = 1;
1551         delete_char(vc, nr);
1552 }
1553
1554 /* console_sem is held */
1555 static void csi_M(struct vc_data *vc, unsigned int nr)
1556 {
1557         if (nr > vc->vc_rows - vc->vc_y)
1558                 nr = vc->vc_rows - vc->vc_y;
1559         else if (!nr)
1560                 nr=1;
1561         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1562         vc->vc_need_wrap = 0;
1563 }
1564
1565 /* console_sem is held (except via vc_init->reset_terminal */
1566 static void save_cur(struct vc_data *vc)
1567 {
1568         vc->vc_saved_x          = vc->vc_x;
1569         vc->vc_saved_y          = vc->vc_y;
1570         vc->vc_s_intensity      = vc->vc_intensity;
1571         vc->vc_s_italic         = vc->vc_italic;
1572         vc->vc_s_underline      = vc->vc_underline;
1573         vc->vc_s_blink          = vc->vc_blink;
1574         vc->vc_s_reverse        = vc->vc_reverse;
1575         vc->vc_s_charset        = vc->vc_charset;
1576         vc->vc_s_color          = vc->vc_color;
1577         vc->vc_saved_G0         = vc->vc_G0_charset;
1578         vc->vc_saved_G1         = vc->vc_G1_charset;
1579 }
1580
1581 /* console_sem is held */
1582 static void restore_cur(struct vc_data *vc)
1583 {
1584         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1585         vc->vc_intensity        = vc->vc_s_intensity;
1586         vc->vc_italic           = vc->vc_s_italic;
1587         vc->vc_underline        = vc->vc_s_underline;
1588         vc->vc_blink            = vc->vc_s_blink;
1589         vc->vc_reverse          = vc->vc_s_reverse;
1590         vc->vc_charset          = vc->vc_s_charset;
1591         vc->vc_color            = vc->vc_s_color;
1592         vc->vc_G0_charset       = vc->vc_saved_G0;
1593         vc->vc_G1_charset       = vc->vc_saved_G1;
1594         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1595         update_attr(vc);
1596         vc->vc_need_wrap = 0;
1597 }
1598
1599 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1600         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1601         ESpalette };
1602
1603 /* console_sem is held (except via vc_init()) */
1604 static void reset_terminal(struct vc_data *vc, int do_clear)
1605 {
1606         vc->vc_top              = 0;
1607         vc->vc_bottom           = vc->vc_rows;
1608         vc->vc_state            = ESnormal;
1609         vc->vc_ques             = 0;
1610         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1611         vc->vc_G0_charset       = LAT1_MAP;
1612         vc->vc_G1_charset       = GRAF_MAP;
1613         vc->vc_charset          = 0;
1614         vc->vc_need_wrap        = 0;
1615         vc->vc_report_mouse     = 0;
1616         vc->vc_utf              = default_utf8;
1617         vc->vc_utf_count        = 0;
1618
1619         vc->vc_disp_ctrl        = 0;
1620         vc->vc_toggle_meta      = 0;
1621
1622         vc->vc_decscnm          = 0;
1623         vc->vc_decom            = 0;
1624         vc->vc_decawm           = 1;
1625         vc->vc_deccm            = global_cursor_default;
1626         vc->vc_decim            = 0;
1627
1628         set_kbd(vc, decarm);
1629         clr_kbd(vc, decckm);
1630         clr_kbd(vc, kbdapplic);
1631         clr_kbd(vc, lnm);
1632         kbd_table[vc->vc_num].lockstate = 0;
1633         kbd_table[vc->vc_num].slockstate = 0;
1634         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1635         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1636         /* do not do set_leds here because this causes an endless tasklet loop
1637            when the keyboard hasn't been initialized yet */
1638
1639         vc->vc_cursor_type = CUR_DEFAULT;
1640         vc->vc_complement_mask = vc->vc_s_complement_mask;
1641
1642         default_attr(vc);
1643         update_attr(vc);
1644
1645         vc->vc_tab_stop[0]      = 0x01010100;
1646         vc->vc_tab_stop[1]      =
1647         vc->vc_tab_stop[2]      =
1648         vc->vc_tab_stop[3]      =
1649         vc->vc_tab_stop[4]      =
1650         vc->vc_tab_stop[5]      =
1651         vc->vc_tab_stop[6]      =
1652         vc->vc_tab_stop[7]      = 0x01010101;
1653
1654         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1655         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1656
1657         gotoxy(vc, 0, 0);
1658         save_cur(vc);
1659         if (do_clear)
1660             csi_J(vc, 2);
1661 }
1662
1663 /* console_sem is held */
1664 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1665 {
1666         /*
1667          *  Control characters can be used in the _middle_
1668          *  of an escape sequence.
1669          */
1670         switch (c) {
1671         case 0:
1672                 return;
1673         case 7:
1674                 if (vc->vc_bell_duration)
1675                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1676                 return;
1677         case 8:
1678                 bs(vc);
1679                 return;
1680         case 9:
1681                 vc->vc_pos -= (vc->vc_x << 1);
1682                 while (vc->vc_x < vc->vc_cols - 1) {
1683                         vc->vc_x++;
1684                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1685                                 break;
1686                 }
1687                 vc->vc_pos += (vc->vc_x << 1);
1688                 notify_write(vc, '\t');
1689                 return;
1690         case 10: case 11: case 12:
1691                 lf(vc);
1692                 if (!is_kbd(vc, lnm))
1693                         return;
1694         case 13:
1695                 cr(vc);
1696                 return;
1697         case 14:
1698                 vc->vc_charset = 1;
1699                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1700                 vc->vc_disp_ctrl = 1;
1701                 return;
1702         case 15:
1703                 vc->vc_charset = 0;
1704                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1705                 vc->vc_disp_ctrl = 0;
1706                 return;
1707         case 24: case 26:
1708                 vc->vc_state = ESnormal;
1709                 return;
1710         case 27:
1711                 vc->vc_state = ESesc;
1712                 return;
1713         case 127:
1714                 del(vc);
1715                 return;
1716         case 128+27:
1717                 vc->vc_state = ESsquare;
1718                 return;
1719         }
1720         switch(vc->vc_state) {
1721         case ESesc:
1722                 vc->vc_state = ESnormal;
1723                 switch (c) {
1724                 case '[':
1725                         vc->vc_state = ESsquare;
1726                         return;
1727                 case ']':
1728                         vc->vc_state = ESnonstd;
1729                         return;
1730                 case '%':
1731                         vc->vc_state = ESpercent;
1732                         return;
1733                 case 'E':
1734                         cr(vc);
1735                         lf(vc);
1736                         return;
1737                 case 'M':
1738                         ri(vc);
1739                         return;
1740                 case 'D':
1741                         lf(vc);
1742                         return;
1743                 case 'H':
1744                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1745                         return;
1746                 case 'Z':
1747                         respond_ID(tty);
1748                         return;
1749                 case '7':
1750                         save_cur(vc);
1751                         return;
1752                 case '8':
1753                         restore_cur(vc);
1754                         return;
1755                 case '(':
1756                         vc->vc_state = ESsetG0;
1757                         return;
1758                 case ')':
1759                         vc->vc_state = ESsetG1;
1760                         return;
1761                 case '#':
1762                         vc->vc_state = EShash;
1763                         return;
1764                 case 'c':
1765                         reset_terminal(vc, 1);
1766                         return;
1767                 case '>':  /* Numeric keypad */
1768                         clr_kbd(vc, kbdapplic);
1769                         return;
1770                 case '=':  /* Appl. keypad */
1771                         set_kbd(vc, kbdapplic);
1772                         return;
1773                 }
1774                 return;
1775         case ESnonstd:
1776                 if (c=='P') {   /* palette escape sequence */
1777                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1778                                 vc->vc_par[vc->vc_npar] = 0;
1779                         vc->vc_npar = 0;
1780                         vc->vc_state = ESpalette;
1781                         return;
1782                 } else if (c=='R') {   /* reset palette */
1783                         reset_palette(vc);
1784                         vc->vc_state = ESnormal;
1785                 } else
1786                         vc->vc_state = ESnormal;
1787                 return;
1788         case ESpalette:
1789                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1790                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1791                         if (vc->vc_npar == 7) {
1792                                 int i = vc->vc_par[0] * 3, j = 1;
1793                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1794                                 vc->vc_palette[i++] += vc->vc_par[j++];
1795                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1796                                 vc->vc_palette[i++] += vc->vc_par[j++];
1797                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1798                                 vc->vc_palette[i] += vc->vc_par[j];
1799                                 set_palette(vc);
1800                                 vc->vc_state = ESnormal;
1801                         }
1802                 } else
1803                         vc->vc_state = ESnormal;
1804                 return;
1805         case ESsquare:
1806                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1807                         vc->vc_par[vc->vc_npar] = 0;
1808                 vc->vc_npar = 0;
1809                 vc->vc_state = ESgetpars;
1810                 if (c == '[') { /* Function key */
1811                         vc->vc_state=ESfunckey;
1812                         return;
1813                 }
1814                 vc->vc_ques = (c == '?');
1815                 if (vc->vc_ques)
1816                         return;
1817         case ESgetpars:
1818                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1819                         vc->vc_npar++;
1820                         return;
1821                 } else if (c>='0' && c<='9') {
1822                         vc->vc_par[vc->vc_npar] *= 10;
1823                         vc->vc_par[vc->vc_npar] += c - '0';
1824                         return;
1825                 } else
1826                         vc->vc_state = ESgotpars;
1827         case ESgotpars:
1828                 vc->vc_state = ESnormal;
1829                 switch(c) {
1830                 case 'h':
1831                         set_mode(vc, 1);
1832                         return;
1833                 case 'l':
1834                         set_mode(vc, 0);
1835                         return;
1836                 case 'c':
1837                         if (vc->vc_ques) {
1838                                 if (vc->vc_par[0])
1839                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1840                                 else
1841                                         vc->vc_cursor_type = CUR_DEFAULT;
1842                                 return;
1843                         }
1844                         break;
1845                 case 'm':
1846                         if (vc->vc_ques) {
1847                                 clear_selection();
1848                                 if (vc->vc_par[0])
1849                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1850                                 else
1851                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1852                                 return;
1853                         }
1854                         break;
1855                 case 'n':
1856                         if (!vc->vc_ques) {
1857                                 if (vc->vc_par[0] == 5)
1858                                         status_report(tty);
1859                                 else if (vc->vc_par[0] == 6)
1860                                         cursor_report(vc, tty);
1861                         }
1862                         return;
1863                 }
1864                 if (vc->vc_ques) {
1865                         vc->vc_ques = 0;
1866                         return;
1867                 }
1868                 switch(c) {
1869                 case 'G': case '`':
1870                         if (vc->vc_par[0])
1871                                 vc->vc_par[0]--;
1872                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1873                         return;
1874                 case 'A':
1875                         if (!vc->vc_par[0])
1876                                 vc->vc_par[0]++;
1877                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1878                         return;
1879                 case 'B': case 'e':
1880                         if (!vc->vc_par[0])
1881                                 vc->vc_par[0]++;
1882                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1883                         return;
1884                 case 'C': case 'a':
1885                         if (!vc->vc_par[0])
1886                                 vc->vc_par[0]++;
1887                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1888                         return;
1889                 case 'D':
1890                         if (!vc->vc_par[0])
1891                                 vc->vc_par[0]++;
1892                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1893                         return;
1894                 case 'E':
1895                         if (!vc->vc_par[0])
1896                                 vc->vc_par[0]++;
1897                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1898                         return;
1899                 case 'F':
1900                         if (!vc->vc_par[0])
1901                                 vc->vc_par[0]++;
1902                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1903                         return;
1904                 case 'd':
1905                         if (vc->vc_par[0])
1906                                 vc->vc_par[0]--;
1907                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1908                         return;
1909                 case 'H': case 'f':
1910                         if (vc->vc_par[0])
1911                                 vc->vc_par[0]--;
1912                         if (vc->vc_par[1])
1913                                 vc->vc_par[1]--;
1914                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1915                         return;
1916                 case 'J':
1917                         csi_J(vc, vc->vc_par[0]);
1918                         return;
1919                 case 'K':
1920                         csi_K(vc, vc->vc_par[0]);
1921                         return;
1922                 case 'L':
1923                         csi_L(vc, vc->vc_par[0]);
1924                         return;
1925                 case 'M':
1926                         csi_M(vc, vc->vc_par[0]);
1927                         return;
1928                 case 'P':
1929                         csi_P(vc, vc->vc_par[0]);
1930                         return;
1931                 case 'c':
1932                         if (!vc->vc_par[0])
1933                                 respond_ID(tty);
1934                         return;
1935                 case 'g':
1936                         if (!vc->vc_par[0])
1937                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1938                         else if (vc->vc_par[0] == 3) {
1939                                 vc->vc_tab_stop[0] =
1940                                         vc->vc_tab_stop[1] =
1941                                         vc->vc_tab_stop[2] =
1942                                         vc->vc_tab_stop[3] =
1943                                         vc->vc_tab_stop[4] =
1944                                         vc->vc_tab_stop[5] =
1945                                         vc->vc_tab_stop[6] =
1946                                         vc->vc_tab_stop[7] = 0;
1947                         }
1948                         return;
1949                 case 'm':
1950                         csi_m(vc);
1951                         return;
1952                 case 'q': /* DECLL - but only 3 leds */
1953                         /* map 0,1,2,3 to 0,1,2,4 */
1954                         if (vc->vc_par[0] < 4)
1955                                 setledstate(kbd_table + vc->vc_num,
1956                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1957                         return;
1958                 case 'r':
1959                         if (!vc->vc_par[0])
1960                                 vc->vc_par[0]++;
1961                         if (!vc->vc_par[1])
1962                                 vc->vc_par[1] = vc->vc_rows;
1963                         /* Minimum allowed region is 2 lines */
1964                         if (vc->vc_par[0] < vc->vc_par[1] &&
1965                             vc->vc_par[1] <= vc->vc_rows) {
1966                                 vc->vc_top = vc->vc_par[0] - 1;
1967                                 vc->vc_bottom = vc->vc_par[1];
1968                                 gotoxay(vc, 0, 0);
1969                         }
1970                         return;
1971                 case 's':
1972                         save_cur(vc);
1973                         return;
1974                 case 'u':
1975                         restore_cur(vc);
1976                         return;
1977                 case 'X':
1978                         csi_X(vc, vc->vc_par[0]);
1979                         return;
1980                 case '@':
1981                         csi_at(vc, vc->vc_par[0]);
1982                         return;
1983                 case ']': /* setterm functions */
1984                         setterm_command(vc);
1985                         return;
1986                 }
1987                 return;
1988         case ESpercent:
1989                 vc->vc_state = ESnormal;
1990                 switch (c) {
1991                 case '@':  /* defined in ISO 2022 */
1992                         vc->vc_utf = 0;
1993                         return;
1994                 case 'G':  /* prelim official escape code */
1995                 case '8':  /* retained for compatibility */
1996                         vc->vc_utf = 1;
1997                         return;
1998                 }
1999                 return;
2000         case ESfunckey:
2001                 vc->vc_state = ESnormal;
2002                 return;
2003         case EShash:
2004                 vc->vc_state = ESnormal;
2005                 if (c == '8') {
2006                         /* DEC screen alignment test. kludge :-) */
2007                         vc->vc_video_erase_char =
2008                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2009                         csi_J(vc, 2);
2010                         vc->vc_video_erase_char =
2011                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2012                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2013                 }
2014                 return;
2015         case ESsetG0:
2016                 if (c == '0')
2017                         vc->vc_G0_charset = GRAF_MAP;
2018                 else if (c == 'B')
2019                         vc->vc_G0_charset = LAT1_MAP;
2020                 else if (c == 'U')
2021                         vc->vc_G0_charset = IBMPC_MAP;
2022                 else if (c == 'K')
2023                         vc->vc_G0_charset = USER_MAP;
2024                 if (vc->vc_charset == 0)
2025                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2026                 vc->vc_state = ESnormal;
2027                 return;
2028         case ESsetG1:
2029                 if (c == '0')
2030                         vc->vc_G1_charset = GRAF_MAP;
2031                 else if (c == 'B')
2032                         vc->vc_G1_charset = LAT1_MAP;
2033                 else if (c == 'U')
2034                         vc->vc_G1_charset = IBMPC_MAP;
2035                 else if (c == 'K')
2036                         vc->vc_G1_charset = USER_MAP;
2037                 if (vc->vc_charset == 1)
2038                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2039                 vc->vc_state = ESnormal;
2040                 return;
2041         default:
2042                 vc->vc_state = ESnormal;
2043         }
2044 }
2045
2046 /* This is a temporary buffer used to prepare a tty console write
2047  * so that we can easily avoid touching user space while holding the
2048  * console spinlock.  It is allocated in con_init and is shared by
2049  * this code and the vc_screen read/write tty calls.
2050  *
2051  * We have to allocate this statically in the kernel data section
2052  * since console_init (and thus con_init) are called before any
2053  * kernel memory allocation is available.
2054  */
2055 char con_buf[CON_BUF_SIZE];
2056 DEFINE_MUTEX(con_buf_mtx);
2057
2058 /* is_double_width() is based on the wcwidth() implementation by
2059  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2060  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2061  */
2062 struct interval {
2063         uint32_t first;
2064         uint32_t last;
2065 };
2066
2067 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2068 {
2069         int min = 0;
2070         int mid;
2071
2072         if (ucs < table[0].first || ucs > table[max].last)
2073                 return 0;
2074         while (max >= min) {
2075                 mid = (min + max) / 2;
2076                 if (ucs > table[mid].last)
2077                         min = mid + 1;
2078                 else if (ucs < table[mid].first)
2079                         max = mid - 1;
2080                 else
2081                         return 1;
2082         }
2083         return 0;
2084 }
2085
2086 static int is_double_width(uint32_t ucs)
2087 {
2088         static const struct interval double_width[] = {
2089                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2090                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2091                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2092                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2093         };
2094         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2095 }
2096
2097 /* acquires console_sem */
2098 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2099 {
2100 #ifdef VT_BUF_VRAM_ONLY
2101 #define FLUSH do { } while(0);
2102 #else
2103 #define FLUSH if (draw_x >= 0) { \
2104         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2105         draw_x = -1; \
2106         }
2107 #endif
2108
2109         int c, tc, ok, n = 0, draw_x = -1;
2110         unsigned int currcons;
2111         unsigned long draw_from = 0, draw_to = 0;
2112         struct vc_data *vc;
2113         unsigned char vc_attr;
2114         struct vt_notifier_param param;
2115         uint8_t rescan;
2116         uint8_t inverse;
2117         uint8_t width;
2118         u16 himask, charmask;
2119         const unsigned char *orig_buf = NULL;
2120         int orig_count;
2121
2122         if (in_interrupt())
2123                 return count;
2124
2125         might_sleep();
2126
2127         acquire_console_sem();
2128         vc = tty->driver_data;
2129         if (vc == NULL) {
2130                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2131                 release_console_sem();
2132                 return 0;
2133         }
2134
2135         currcons = vc->vc_num;
2136         if (!vc_cons_allocated(currcons)) {
2137             /* could this happen? */
2138                 printk_once("con_write: tty %d not allocated\n", currcons+1);
2139             release_console_sem();
2140             return 0;
2141         }
2142         orig_buf = buf;
2143         orig_count = count;
2144
2145         himask = vc->vc_hi_font_mask;
2146         charmask = himask ? 0x1ff : 0xff;
2147
2148         /* undraw cursor first */
2149         if (IS_FG(vc))
2150                 hide_cursor(vc);
2151
2152         param.vc = vc;
2153
2154         while (!tty->stopped && count) {
2155                 int orig = *buf;
2156                 c = orig;
2157                 buf++;
2158                 n++;
2159                 count--;
2160                 rescan = 0;
2161                 inverse = 0;
2162                 width = 1;
2163
2164                 /* Do no translation at all in control states */
2165                 if (vc->vc_state != ESnormal) {
2166                         tc = c;
2167                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2168                     /* Combine UTF-8 into Unicode in vc_utf_char.
2169                      * vc_utf_count is the number of continuation bytes still
2170                      * expected to arrive.
2171                      * vc_npar is the number of continuation bytes arrived so
2172                      * far
2173                      */
2174 rescan_last_byte:
2175                     if ((c & 0xc0) == 0x80) {
2176                         /* Continuation byte received */
2177                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2178                         if (vc->vc_utf_count) {
2179                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2180                             vc->vc_npar++;
2181                             if (--vc->vc_utf_count) {
2182                                 /* Still need some bytes */
2183                                 continue;
2184                             }
2185                             /* Got a whole character */
2186                             c = vc->vc_utf_char;
2187                             /* Reject overlong sequences */
2188                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2189                                         c > utf8_length_changes[vc->vc_npar])
2190                                 c = 0xfffd;
2191                         } else {
2192                             /* Unexpected continuation byte */
2193                             vc->vc_utf_count = 0;
2194                             c = 0xfffd;
2195                         }
2196                     } else {
2197                         /* Single ASCII byte or first byte of a sequence received */
2198                         if (vc->vc_utf_count) {
2199                             /* Continuation byte expected */
2200                             rescan = 1;
2201                             vc->vc_utf_count = 0;
2202                             c = 0xfffd;
2203                         } else if (c > 0x7f) {
2204                             /* First byte of a multibyte sequence received */
2205                             vc->vc_npar = 0;
2206                             if ((c & 0xe0) == 0xc0) {
2207                                 vc->vc_utf_count = 1;
2208                                 vc->vc_utf_char = (c & 0x1f);
2209                             } else if ((c & 0xf0) == 0xe0) {
2210                                 vc->vc_utf_count = 2;
2211                                 vc->vc_utf_char = (c & 0x0f);
2212                             } else if ((c & 0xf8) == 0xf0) {
2213                                 vc->vc_utf_count = 3;
2214                                 vc->vc_utf_char = (c & 0x07);
2215                             } else if ((c & 0xfc) == 0xf8) {
2216                                 vc->vc_utf_count = 4;
2217                                 vc->vc_utf_char = (c & 0x03);
2218                             } else if ((c & 0xfe) == 0xfc) {
2219                                 vc->vc_utf_count = 5;
2220                                 vc->vc_utf_char = (c & 0x01);
2221                             } else {
2222                                 /* 254 and 255 are invalid */
2223                                 c = 0xfffd;
2224                             }
2225                             if (vc->vc_utf_count) {
2226                                 /* Still need some bytes */
2227                                 continue;
2228                             }
2229                         }
2230                         /* Nothing to do if an ASCII byte was received */
2231                     }
2232                     /* End of UTF-8 decoding. */
2233                     /* c is the received character, or U+FFFD for invalid sequences. */
2234                     /* Replace invalid Unicode code points with U+FFFD too */
2235                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2236                         c = 0xfffd;
2237                     tc = c;
2238                 } else {        /* no utf or alternate charset mode */
2239                     tc = vc_translate(vc, c);
2240                 }
2241
2242                 param.c = tc;
2243                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2244                                         &param) == NOTIFY_STOP)
2245                         continue;
2246
2247                 /* If the original code was a control character we
2248                  * only allow a glyph to be displayed if the code is
2249                  * not normally used (such as for cursor movement) or
2250                  * if the disp_ctrl mode has been explicitly enabled.
2251                  * Certain characters (as given by the CTRL_ALWAYS
2252                  * bitmap) are always displayed as control characters,
2253                  * as the console would be pretty useless without
2254                  * them; to display an arbitrary font position use the
2255                  * direct-to-font zone in UTF-8 mode.
2256                  */
2257                 ok = tc && (c >= 32 ||
2258                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2259                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2260                         && (c != 127 || vc->vc_disp_ctrl)
2261                         && (c != 128+27);
2262
2263                 if (vc->vc_state == ESnormal && ok) {
2264                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2265                                 if (is_double_width(c))
2266                                         width = 2;
2267                         }
2268                         /* Now try to find out how to display it */
2269                         tc = conv_uni_to_pc(vc, tc);
2270                         if (tc & ~charmask) {
2271                                 if (tc == -1 || tc == -2) {
2272                                     continue; /* nothing to display */
2273                                 }
2274                                 /* Glyph not found */
2275                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2276                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2277                                        This would make absolutely no sense with Unicode in mind,
2278                                        but do this for ASCII characters since a font may lack
2279                                        Unicode mapping info and we don't want to end up with
2280                                        having question marks only. */
2281                                     tc = c;
2282                                 } else {
2283                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2284                                     tc = conv_uni_to_pc(vc, 0xfffd);
2285                                     if (tc < 0) {
2286                                         inverse = 1;
2287                                         tc = conv_uni_to_pc(vc, '?');
2288                                         if (tc < 0) tc = '?';
2289                                     }
2290                                 }
2291                         }
2292
2293                         if (!inverse) {
2294                                 vc_attr = vc->vc_attr;
2295                         } else {
2296                                 /* invert vc_attr */
2297                                 if (!vc->vc_can_do_color) {
2298                                         vc_attr = (vc->vc_attr) ^ 0x08;
2299                                 } else if (vc->vc_hi_font_mask == 0x100) {
2300                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2301                                 } else {
2302                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2303                                 }
2304                                 FLUSH
2305                         }
2306
2307                         while (1) {
2308                                 if (vc->vc_need_wrap || vc->vc_decim)
2309                                         FLUSH
2310                                 if (vc->vc_need_wrap) {
2311                                         cr(vc);
2312                                         lf(vc);
2313                                 }
2314                                 if (vc->vc_decim)
2315                                         insert_char(vc, 1);
2316                                 scr_writew(himask ?
2317                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2318                                              (vc_attr << 8) + tc,
2319                                            (u16 *) vc->vc_pos);
2320                                 if (DO_UPDATE(vc) && draw_x < 0) {
2321                                         draw_x = vc->vc_x;
2322                                         draw_from = vc->vc_pos;
2323                                 }
2324                                 if (vc->vc_x == vc->vc_cols - 1) {
2325                                         vc->vc_need_wrap = vc->vc_decawm;
2326                                         draw_to = vc->vc_pos + 2;
2327                                 } else {
2328                                         vc->vc_x++;
2329                                         draw_to = (vc->vc_pos += 2);
2330                                 }
2331
2332                                 if (!--width) break;
2333
2334                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2335                                 if (tc < 0) tc = ' ';
2336                         }
2337                         notify_write(vc, c);
2338
2339                         if (inverse) {
2340                                 FLUSH
2341                         }
2342
2343                         if (rescan) {
2344                                 rescan = 0;
2345                                 inverse = 0;
2346                                 width = 1;
2347                                 c = orig;
2348                                 goto rescan_last_byte;
2349                         }
2350                         continue;
2351                 }
2352                 FLUSH
2353                 do_con_trol(tty, vc, orig);
2354         }
2355         FLUSH
2356         console_conditional_schedule();
2357         release_console_sem();
2358         notify_update(vc);
2359         return n;
2360 #undef FLUSH
2361 }
2362
2363 /*
2364  * This is the console switching callback.
2365  *
2366  * Doing console switching in a process context allows
2367  * us to do the switches asynchronously (needed when we want
2368  * to switch due to a keyboard interrupt).  Synchronization
2369  * with other console code and prevention of re-entrancy is
2370  * ensured with console_sem.
2371  */
2372 static void console_callback(struct work_struct *ignored)
2373 {
2374         acquire_console_sem();
2375
2376         if (want_console >= 0) {
2377                 if (want_console != fg_console &&
2378                     vc_cons_allocated(want_console)) {
2379                         hide_cursor(vc_cons[fg_console].d);
2380                         change_console(vc_cons[want_console].d);
2381                         /* we only changed when the console had already
2382                            been allocated - a new console is not created
2383                            in an interrupt routine */
2384                 }
2385                 want_console = -1;
2386         }
2387         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2388                 do_poke_blanked_console = 0;
2389                 poke_blanked_console();
2390         }
2391         if (scrollback_delta) {
2392                 struct vc_data *vc = vc_cons[fg_console].d;
2393                 clear_selection();
2394                 if (vc->vc_mode == KD_TEXT)
2395                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2396                 scrollback_delta = 0;
2397         }
2398         if (blank_timer_expired) {
2399                 do_blank_screen(0);
2400                 blank_timer_expired = 0;
2401         }
2402         notify_update(vc_cons[fg_console].d);
2403
2404         release_console_sem();
2405 }
2406
2407 int set_console(int nr)
2408 {
2409         struct vc_data *vc = vc_cons[fg_console].d;
2410
2411         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2412                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2413
2414                 /*
2415                  * Console switch will fail in console_callback() or
2416                  * change_console() so there is no point scheduling
2417                  * the callback
2418                  *
2419                  * Existing set_console() users don't check the return
2420                  * value so this shouldn't break anything
2421                  */
2422                 return -EINVAL;
2423         }
2424
2425         want_console = nr;
2426         schedule_console_callback();
2427
2428         return 0;
2429 }
2430
2431 struct tty_driver *console_driver;
2432
2433 #ifdef CONFIG_VT_CONSOLE
2434
2435 /**
2436  * vt_kmsg_redirect() - Sets/gets the kernel message console
2437  * @new:        The new virtual terminal number or -1 if the console should stay
2438  *              unchanged
2439  *
2440  * By default, the kernel messages are always printed on the current virtual
2441  * console. However, the user may modify that default with the
2442  * TIOCL_SETKMSGREDIRECT ioctl call.
2443  *
2444  * This function sets the kernel message console to be @new. It returns the old
2445  * virtual console number. The virtual terminal number 0 (both as parameter and
2446  * return value) means no redirection (i.e. always printed on the currently
2447  * active console).
2448  *
2449  * The parameter -1 means that only the current console is returned, but the
2450  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2451  * case to make the code more understandable.
2452  *
2453  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2454  * the parameter and always returns 0.
2455  */
2456 int vt_kmsg_redirect(int new)
2457 {
2458         static int kmsg_con;
2459
2460         if (new != -1)
2461                 return xchg(&kmsg_con, new);
2462         else
2463                 return kmsg_con;
2464 }
2465
2466 /*
2467  *      Console on virtual terminal
2468  *
2469  * The console must be locked when we get here.
2470  */
2471
2472 static void vt_console_print(struct console *co, const char *b, unsigned count)
2473 {
2474         struct vc_data *vc = vc_cons[fg_console].d;
2475         unsigned char c;
2476         static DEFINE_SPINLOCK(printing_lock);
2477         const ushort *start;
2478         ushort cnt = 0;
2479         ushort myx;
2480         int kmsg_console;
2481
2482         /* console busy or not yet initialized */
2483         if (!printable)
2484                 return;
2485         if (!spin_trylock(&printing_lock))
2486                 return;
2487
2488         kmsg_console = vt_get_kmsg_redirect();
2489         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2490                 vc = vc_cons[kmsg_console - 1].d;
2491
2492         /* read `x' only after setting currcons properly (otherwise
2493            the `x' macro will read the x of the foreground console). */
2494         myx = vc->vc_x;
2495
2496         if (!vc_cons_allocated(fg_console)) {
2497                 /* impossible */
2498                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2499                 goto quit;
2500         }
2501
2502         if (vc->vc_mode != KD_TEXT)
2503                 goto quit;
2504
2505         /* undraw cursor first */
2506         if (IS_FG(vc))
2507                 hide_cursor(vc);
2508
2509         start = (ushort *)vc->vc_pos;
2510
2511         /* Contrived structure to try to emulate original need_wrap behaviour
2512          * Problems caused when we have need_wrap set on '\n' character */
2513         while (count--) {
2514                 c = *b++;
2515                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2516                         if (cnt > 0) {
2517                                 if (CON_IS_VISIBLE(vc))
2518                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2519                                 vc->vc_x += cnt;
2520                                 if (vc->vc_need_wrap)
2521                                         vc->vc_x--;
2522                                 cnt = 0;
2523                         }
2524                         if (c == 8) {           /* backspace */
2525                                 bs(vc);
2526                                 start = (ushort *)vc->vc_pos;
2527                                 myx = vc->vc_x;
2528                                 continue;
2529                         }
2530                         if (c != 13)
2531                                 lf(vc);
2532                         cr(vc);
2533                         start = (ushort *)vc->vc_pos;
2534                         myx = vc->vc_x;
2535                         if (c == 10 || c == 13)
2536                                 continue;
2537                 }
2538                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2539                 notify_write(vc, c);
2540                 cnt++;
2541                 if (myx == vc->vc_cols - 1) {
2542                         vc->vc_need_wrap = 1;
2543                         continue;
2544                 }
2545                 vc->vc_pos += 2;
2546                 myx++;
2547         }
2548         if (cnt > 0) {
2549                 if (CON_IS_VISIBLE(vc))
2550                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2551                 vc->vc_x += cnt;
2552                 if (vc->vc_x == vc->vc_cols) {
2553                         vc->vc_x--;
2554                         vc->vc_need_wrap = 1;
2555                 }
2556         }
2557         set_cursor(vc);
2558         notify_update(vc);
2559
2560 quit:
2561         spin_unlock(&printing_lock);
2562 }
2563
2564 static struct tty_driver *vt_console_device(struct console *c, int *index)
2565 {
2566         *index = c->index ? c->index-1 : fg_console;
2567         return console_driver;
2568 }
2569
2570 static struct console vt_console_driver = {
2571         .name           = "tty",
2572         .write          = vt_console_print,
2573         .device         = vt_console_device,
2574         .unblank        = unblank_screen,
2575         .flags          = CON_PRINTBUFFER,
2576         .index          = -1,
2577 };
2578 #endif
2579
2580 /*
2581  *      Handling of Linux-specific VC ioctls
2582  */
2583
2584 /*
2585  * Generally a bit racy with respect to console_sem().
2586  *
2587  * There are some functions which don't need it.
2588  *
2589  * There are some functions which can sleep for arbitrary periods
2590  * (paste_selection) but we don't need the lock there anyway.
2591  *
2592  * set_selection has locking, and definitely needs it
2593  */
2594
2595 int tioclinux(struct tty_struct *tty, unsigned long arg)
2596 {
2597         char type, data;
2598         char __user *p = (char __user *)arg;
2599         int lines;
2600         int ret;
2601
2602         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2603                 return -EPERM;
2604         if (get_user(type, p))
2605                 return -EFAULT;
2606         ret = 0;
2607
2608         lock_kernel();
2609
2610         switch (type)
2611         {
2612                 case TIOCL_SETSEL:
2613                         acquire_console_sem();
2614                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2615                         release_console_sem();
2616                         break;
2617                 case TIOCL_PASTESEL:
2618                         ret = paste_selection(tty);
2619                         break;
2620                 case TIOCL_UNBLANKSCREEN:
2621                         acquire_console_sem();
2622                         unblank_screen();
2623                         release_console_sem();
2624                         break;
2625                 case TIOCL_SELLOADLUT:
2626                         ret = sel_loadlut(p);
2627                         break;
2628                 case TIOCL_GETSHIFTSTATE:
2629
2630         /*
2631          * Make it possible to react to Shift+Mousebutton.
2632          * Note that 'shift_state' is an undocumented
2633          * kernel-internal variable; programs not closely
2634          * related to the kernel should not use this.
2635          */
2636                         data = shift_state;
2637                         ret = __put_user(data, p);
2638                         break;
2639                 case TIOCL_GETMOUSEREPORTING:
2640                         data = mouse_reporting();
2641                         ret = __put_user(data, p);
2642                         break;
2643                 case TIOCL_SETVESABLANK:
2644                         ret = set_vesa_blanking(p);
2645                         break;
2646                 case TIOCL_GETKMSGREDIRECT:
2647                         data = vt_get_kmsg_redirect();
2648                         ret = __put_user(data, p);
2649                         break;
2650                 case TIOCL_SETKMSGREDIRECT:
2651                         if (!capable(CAP_SYS_ADMIN)) {
2652                                 ret = -EPERM;
2653                         } else {
2654                                 if (get_user(data, p+1))
2655                                         ret = -EFAULT;
2656                                 else
2657                                         vt_kmsg_redirect(data);
2658                         }
2659                         break;
2660                 case TIOCL_GETFGCONSOLE:
2661                         ret = fg_console;
2662                         break;
2663                 case TIOCL_SCROLLCONSOLE:
2664                         if (get_user(lines, (s32 __user *)(p+4))) {
2665                                 ret = -EFAULT;
2666                         } else {
2667                                 scrollfront(vc_cons[fg_console].d, lines);
2668                                 ret = 0;
2669                         }
2670                         break;
2671                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2672                         acquire_console_sem();
2673                         ignore_poke = 1;
2674                         do_blank_screen(0);
2675                         release_console_sem();
2676                         break;
2677                 case TIOCL_BLANKEDSCREEN:
2678                         ret = console_blanked;
2679                         break;
2680                 default:
2681                         ret = -EINVAL;
2682                         break;
2683         }
2684         unlock_kernel();
2685         return ret;
2686 }
2687
2688 /*
2689  * /dev/ttyN handling
2690  */
2691
2692 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2693 {
2694         int     retval;
2695
2696         retval = do_con_write(tty, buf, count);
2697         con_flush_chars(tty);
2698
2699         return retval;
2700 }
2701
2702 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2703 {
2704         if (in_interrupt())
2705                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2706         return do_con_write(tty, &ch, 1);
2707 }
2708
2709 static int con_write_room(struct tty_struct *tty)
2710 {
2711         if (tty->stopped)
2712                 return 0;
2713         return 32768;           /* No limit, really; we're not buffering */
2714 }
2715
2716 static int con_chars_in_buffer(struct tty_struct *tty)
2717 {
2718         return 0;               /* we're not buffering */
2719 }
2720
2721 /*
2722  * con_throttle and con_unthrottle are only used for
2723  * paste_selection(), which has to stuff in a large number of
2724  * characters...
2725  */
2726 static void con_throttle(struct tty_struct *tty)
2727 {
2728 }
2729
2730 static void con_unthrottle(struct tty_struct *tty)
2731 {
2732         struct vc_data *vc = tty->driver_data;
2733
2734         wake_up_interruptible(&vc->paste_wait);
2735 }
2736
2737 /*
2738  * Turn the Scroll-Lock LED on when the tty is stopped
2739  */
2740 static void con_stop(struct tty_struct *tty)
2741 {
2742         int console_num;
2743         if (!tty)
2744                 return;
2745         console_num = tty->index;
2746         if (!vc_cons_allocated(console_num))
2747                 return;
2748         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2749         set_leds();
2750 }
2751
2752 /*
2753  * Turn the Scroll-Lock LED off when the console is started
2754  */
2755 static void con_start(struct tty_struct *tty)
2756 {
2757         int console_num;
2758         if (!tty)
2759                 return;
2760         console_num = tty->index;
2761         if (!vc_cons_allocated(console_num))
2762                 return;
2763         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2764         set_leds();
2765 }
2766
2767 static void con_flush_chars(struct tty_struct *tty)
2768 {
2769         struct vc_data *vc;
2770
2771         if (in_interrupt())     /* from flush_to_ldisc */
2772                 return;
2773
2774         /* if we race with con_close(), vt may be null */
2775         acquire_console_sem();
2776         vc = tty->driver_data;
2777         if (vc)
2778                 set_cursor(vc);
2779         release_console_sem();
2780 }
2781
2782 /*
2783  * Allocate the console screen memory.
2784  */
2785 static int con_open(struct tty_struct *tty, struct file *filp)
2786 {
2787         unsigned int currcons = tty->index;
2788         int ret = 0;
2789
2790         acquire_console_sem();
2791         if (tty->driver_data == NULL) {
2792                 ret = vc_allocate(currcons);
2793                 if (ret == 0) {
2794                         struct vc_data *vc = vc_cons[currcons].d;
2795
2796                         /* Still being freed */
2797                         if (vc->vc_tty) {
2798                                 release_console_sem();
2799                                 return -ERESTARTSYS;
2800                         }
2801                         tty->driver_data = vc;
2802                         vc->vc_tty = tty;
2803
2804                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2805                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2806                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2807                         }
2808                         if (vc->vc_utf)
2809                                 tty->termios->c_iflag |= IUTF8;
2810                         else
2811                                 tty->termios->c_iflag &= ~IUTF8;
2812                         release_console_sem();
2813                         return ret;
2814                 }
2815         }
2816         release_console_sem();
2817         return ret;
2818 }
2819
2820 static void con_close(struct tty_struct *tty, struct file *filp)
2821 {
2822         /* Nothing to do - we defer to shutdown */
2823 }
2824
2825 static void con_shutdown(struct tty_struct *tty)
2826 {
2827         struct vc_data *vc = tty->driver_data;
2828         BUG_ON(vc == NULL);
2829         acquire_console_sem();
2830         vc->vc_tty = NULL;
2831         release_console_sem();
2832         tty_shutdown(tty);
2833 }
2834
2835 static int default_italic_color    = 2; // green (ASCII)
2836 static int default_underline_color = 3; // cyan (ASCII)
2837 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2838 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2839
2840 static void vc_init(struct vc_data *vc, unsigned int rows,
2841                     unsigned int cols, int do_clear)
2842 {
2843         int j, k ;
2844
2845         vc->vc_cols = cols;
2846         vc->vc_rows = rows;
2847         vc->vc_size_row = cols << 1;
2848         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2849
2850         set_origin(vc);
2851         vc->vc_pos = vc->vc_origin;
2852         reset_vc(vc);
2853         for (j=k=0; j<16; j++) {
2854                 vc->vc_palette[k++] = default_red[j] ;
2855                 vc->vc_palette[k++] = default_grn[j] ;
2856                 vc->vc_palette[k++] = default_blu[j] ;
2857         }
2858         vc->vc_def_color       = 0x07;   /* white */
2859         vc->vc_ulcolor         = default_underline_color;
2860         vc->vc_itcolor         = default_italic_color;
2861         vc->vc_halfcolor       = 0x08;   /* grey */
2862         init_waitqueue_head(&vc->paste_wait);
2863         reset_terminal(vc, do_clear);
2864 }
2865
2866 /*
2867  * This routine initializes console interrupts, and does nothing
2868  * else. If you want the screen to clear, call tty_write with
2869  * the appropriate escape-sequence.
2870  */
2871
2872 static int __init con_init(void)
2873 {
2874         const char *display_desc = NULL;
2875         struct vc_data *vc;
2876         unsigned int currcons = 0, i;
2877
2878         acquire_console_sem();
2879
2880         if (conswitchp)
2881                 display_desc = conswitchp->con_startup();
2882         if (!display_desc) {
2883                 fg_console = 0;
2884                 release_console_sem();
2885                 return 0;
2886         }
2887
2888         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2889                 struct con_driver *con_driver = &registered_con_driver[i];
2890
2891                 if (con_driver->con == NULL) {
2892                         con_driver->con = conswitchp;
2893                         con_driver->desc = display_desc;
2894                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2895                         con_driver->first = 0;
2896                         con_driver->last = MAX_NR_CONSOLES - 1;
2897                         break;
2898                 }
2899         }
2900
2901         for (i = 0; i < MAX_NR_CONSOLES; i++)
2902                 con_driver_map[i] = conswitchp;
2903
2904         if (blankinterval) {
2905                 blank_state = blank_normal_wait;
2906                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2907         }
2908
2909         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2910                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2911                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2912                 visual_init(vc, currcons, 1);
2913                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2914                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2915                         currcons || !vc->vc_sw->con_save_screen);
2916         }
2917         currcons = fg_console = 0;
2918         master_display_fg = vc = vc_cons[currcons].d;
2919         set_origin(vc);
2920         save_screen(vc);
2921         gotoxy(vc, vc->vc_x, vc->vc_y);
2922         csi_J(vc, 0);
2923         update_screen(vc);
2924         printk("Console: %s %s %dx%d",
2925                 vc->vc_can_do_color ? "colour" : "mono",
2926                 display_desc, vc->vc_cols, vc->vc_rows);
2927         printable = 1;
2928         printk("\n");
2929
2930         release_console_sem();
2931
2932 #ifdef CONFIG_VT_CONSOLE
2933         register_console(&vt_console_driver);
2934 #endif
2935         return 0;
2936 }
2937 console_initcall(con_init);
2938
2939 static const struct tty_operations con_ops = {
2940         .open = con_open,
2941         .close = con_close,
2942         .write = con_write,
2943         .write_room = con_write_room,
2944         .put_char = con_put_char,
2945         .flush_chars = con_flush_chars,
2946         .chars_in_buffer = con_chars_in_buffer,
2947         .ioctl = vt_ioctl,
2948 #ifdef CONFIG_COMPAT
2949         .compat_ioctl = vt_compat_ioctl,
2950 #endif
2951         .stop = con_stop,
2952         .start = con_start,
2953         .throttle = con_throttle,
2954         .unthrottle = con_unthrottle,
2955         .resize = vt_resize,
2956         .shutdown = con_shutdown
2957 };
2958
2959 static struct cdev vc0_cdev;
2960
2961 int __init vty_init(const struct file_operations *console_fops)
2962 {
2963         cdev_init(&vc0_cdev, console_fops);
2964         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2965             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2966                 panic("Couldn't register /dev/tty0 driver\n");
2967         device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2968
2969         vcs_init();
2970
2971         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2972         if (!console_driver)
2973                 panic("Couldn't allocate console driver\n");
2974         console_driver->owner = THIS_MODULE;
2975         console_driver->name = "tty";
2976         console_driver->name_base = 1;
2977         console_driver->major = TTY_MAJOR;
2978         console_driver->minor_start = 1;
2979         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2980         console_driver->init_termios = tty_std_termios;
2981         if (default_utf8)
2982                 console_driver->init_termios.c_iflag |= IUTF8;
2983         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2984         tty_set_operations(console_driver, &con_ops);
2985         if (tty_register_driver(console_driver))
2986                 panic("Couldn't register console driver\n");
2987         kbd_init();
2988         console_map_init();
2989 #ifdef CONFIG_MDA_CONSOLE
2990         mda_console_init();
2991 #endif
2992         return 0;
2993 }
2994
2995 #ifndef VT_SINGLE_DRIVER
2996
2997 static struct class *vtconsole_class;
2998
2999 static int bind_con_driver(const struct consw *csw, int first, int last,
3000                            int deflt)
3001 {
3002         struct module *owner = csw->owner;
3003         const char *desc = NULL;
3004         struct con_driver *con_driver;
3005         int i, j = -1, k = -1, retval = -ENODEV;
3006
3007         if (!try_module_get(owner))
3008                 return -ENODEV;
3009
3010         acquire_console_sem();
3011
3012         /* check if driver is registered */
3013         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3014                 con_driver = &registered_con_driver[i];
3015
3016                 if (con_driver->con == csw) {
3017                         desc = con_driver->desc;
3018                         retval = 0;
3019                         break;
3020                 }
3021         }
3022
3023         if (retval)
3024                 goto err;
3025
3026         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3027                 csw->con_startup();
3028                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3029         }
3030
3031         if (deflt) {
3032                 if (conswitchp)
3033                         module_put(conswitchp->owner);
3034
3035                 __module_get(owner);
3036                 conswitchp = csw;
3037         }
3038
3039         first = max(first, con_driver->first);
3040         last = min(last, con_driver->last);
3041
3042         for (i = first; i <= last; i++) {
3043                 int old_was_color;
3044                 struct vc_data *vc = vc_cons[i].d;
3045
3046                 if (con_driver_map[i])
3047                         module_put(con_driver_map[i]->owner);
3048                 __module_get(owner);
3049                 con_driver_map[i] = csw;
3050
3051                 if (!vc || !vc->vc_sw)
3052                         continue;
3053
3054                 j = i;
3055
3056                 if (CON_IS_VISIBLE(vc)) {
3057                         k = i;
3058                         save_screen(vc);
3059                 }
3060
3061                 old_was_color = vc->vc_can_do_color;
3062                 vc->vc_sw->con_deinit(vc);
3063                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3064                 visual_init(vc, i, 0);
3065                 set_origin(vc);
3066                 update_attr(vc);
3067
3068                 /* If the console changed between mono <-> color, then
3069                  * the attributes in the screenbuf will be wrong.  The
3070                  * following resets all attributes to something sane.
3071                  */
3072                 if (old_was_color != vc->vc_can_do_color)
3073                         clear_buffer_attributes(vc);
3074         }
3075
3076         printk("Console: switching ");
3077         if (!deflt)
3078                 printk("consoles %d-%d ", first+1, last+1);
3079         if (j >= 0) {
3080                 struct vc_data *vc = vc_cons[j].d;
3081
3082                 printk("to %s %s %dx%d\n",
3083                        vc->vc_can_do_color ? "colour" : "mono",
3084                        desc, vc->vc_cols, vc->vc_rows);
3085
3086                 if (k >= 0) {
3087                         vc = vc_cons[k].d;
3088                         update_screen(vc);
3089                 }
3090         } else
3091                 printk("to %s\n", desc);
3092
3093         retval = 0;
3094 err:
3095         release_console_sem();
3096         module_put(owner);
3097         return retval;
3098 };
3099
3100 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3101 static int con_is_graphics(const struct consw *csw, int first, int last)
3102 {
3103         int i, retval = 0;
3104
3105         for (i = first; i <= last; i++) {
3106                 struct vc_data *vc = vc_cons[i].d;
3107
3108                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3109                         retval = 1;
3110                         break;
3111                 }
3112         }
3113
3114         return retval;
3115 }
3116
3117 /**
3118  * unbind_con_driver - unbind a console driver
3119  * @csw: pointer to console driver to unregister
3120  * @first: first in range of consoles that @csw should be unbound from
3121  * @last: last in range of consoles that @csw should be unbound from
3122  * @deflt: should next bound console driver be default after @csw is unbound?
3123  *
3124  * To unbind a driver from all possible consoles, pass 0 as @first and
3125  * %MAX_NR_CONSOLES as @last.
3126  *
3127  * @deflt controls whether the console that ends up replacing @csw should be
3128  * the default console.
3129  *
3130  * RETURNS:
3131  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3132  * or 0 on success.
3133  */
3134 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3135 {
3136         struct module *owner = csw->owner;
3137         const struct consw *defcsw = NULL;
3138         struct con_driver *con_driver = NULL, *con_back = NULL;
3139         int i, retval = -ENODEV;
3140
3141         if (!try_module_get(owner))
3142                 return -ENODEV;
3143
3144         acquire_console_sem();
3145
3146         /* check if driver is registered and if it is unbindable */
3147         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3148                 con_driver = &registered_con_driver[i];
3149
3150                 if (con_driver->con == csw &&
3151                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3152                         retval = 0;
3153                         break;
3154                 }
3155         }
3156
3157         if (retval) {
3158                 release_console_sem();
3159                 goto err;
3160         }
3161
3162         retval = -ENODEV;
3163
3164         /* check if backup driver exists */
3165         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3166                 con_back = &registered_con_driver[i];
3167
3168                 if (con_back->con &&
3169                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3170                         defcsw = con_back->con;
3171                         retval = 0;
3172                         break;
3173                 }
3174         }
3175
3176         if (retval) {
3177                 release_console_sem();
3178                 goto err;
3179         }
3180
3181         if (!con_is_bound(csw)) {
3182                 release_console_sem();
3183                 goto err;
3184         }
3185
3186         first = max(first, con_driver->first);
3187         last = min(last, con_driver->last);
3188
3189         for (i = first; i <= last; i++) {
3190                 if (con_driver_map[i] == csw) {
3191                         module_put(csw->owner);
3192                         con_driver_map[i] = NULL;
3193                 }
3194         }
3195
3196         if (!con_is_bound(defcsw)) {
3197                 const struct consw *defconsw = conswitchp;
3198
3199                 defcsw->con_startup();
3200                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3201                 /*
3202                  * vgacon may change the default driver to point
3203                  * to dummycon, we restore it here...
3204                  */
3205                 conswitchp = defconsw;
3206         }
3207
3208         if (!con_is_bound(csw))
3209                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3210
3211         release_console_sem();
3212         /* ignore return value, binding should not fail */
3213         bind_con_driver(defcsw, first, last, deflt);
3214 err:
3215         module_put(owner);
3216         return retval;
3217
3218 }
3219 EXPORT_SYMBOL(unbind_con_driver);
3220
3221 static int vt_bind(struct con_driver *con)
3222 {
3223         const struct consw *defcsw = NULL, *csw = NULL;
3224         int i, more = 1, first = -1, last = -1, deflt = 0;
3225
3226         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3227             con_is_graphics(con->con, con->first, con->last))
3228                 goto err;
3229
3230         csw = con->con;
3231
3232         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3233                 struct con_driver *con = &registered_con_driver[i];
3234
3235                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3236                         defcsw = con->con;
3237                         break;
3238                 }
3239         }
3240
3241         if (!defcsw)
3242                 goto err;
3243
3244         while (more) {
3245                 more = 0;
3246
3247                 for (i = con->first; i <= con->last; i++) {
3248                         if (con_driver_map[i] == defcsw) {
3249                                 if (first == -1)
3250                                         first = i;
3251                                 last = i;
3252                                 more = 1;
3253                         } else if (first != -1)
3254                                 break;
3255                 }
3256
3257                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3258                         deflt = 1;
3259
3260                 if (first != -1)
3261                         bind_con_driver(csw, first, last, deflt);
3262
3263                 first = -1;
3264                 last = -1;
3265                 deflt = 0;
3266         }
3267
3268 err:
3269         return 0;
3270 }
3271
3272 static int vt_unbind(struct con_driver *con)
3273 {
3274         const struct consw *csw = NULL;
3275         int i, more = 1, first = -1, last = -1, deflt = 0;
3276
3277         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3278             con_is_graphics(con->con, con->first, con->last))
3279                 goto err;
3280
3281         csw = con->con;
3282
3283         while (more) {
3284                 more = 0;
3285
3286                 for (i = con->first; i <= con->last; i++) {
3287                         if (con_driver_map[i] == csw) {
3288                                 if (first == -1)
3289                                         first = i;
3290                                 last = i;
3291                                 more = 1;
3292                         } else if (first != -1)
3293                                 break;
3294                 }
3295
3296                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3297                         deflt = 1;
3298
3299                 if (first != -1)
3300                         unbind_con_driver(csw, first, last, deflt);
3301
3302                 first = -1;
3303                 last = -1;
3304                 deflt = 0;
3305         }
3306
3307 err:
3308         return 0;
3309 }
3310 #else
3311 static inline int vt_bind(struct con_driver *con)
3312 {
3313         return 0;
3314 }
3315 static inline int vt_unbind(struct con_driver *con)
3316 {
3317         return 0;
3318 }
3319 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3320
3321 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3322                           const char *buf, size_t count)
3323 {
3324         struct con_driver *con = dev_get_drvdata(dev);
3325         int bind = simple_strtoul(buf, NULL, 0);
3326
3327         if (bind)
3328                 vt_bind(con);
3329         else
3330                 vt_unbind(con);
3331
3332         return count;
3333 }
3334
3335 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3336                          char *buf)
3337 {
3338         struct con_driver *con = dev_get_drvdata(dev);
3339         int bind = con_is_bound(con->con);
3340
3341         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3342 }
3343
3344 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3345                          char *buf)
3346 {
3347         struct con_driver *con = dev_get_drvdata(dev);
3348
3349         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3350                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3351                          con->desc);
3352
3353 }
3354
3355 static struct device_attribute device_attrs[] = {
3356         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3357         __ATTR(name, S_IRUGO, show_name, NULL),
3358 };
3359
3360 static int vtconsole_init_device(struct con_driver *con)
3361 {
3362         int i;
3363         int error = 0;
3364
3365         con->flag |= CON_DRIVER_FLAG_ATTR;
3366         dev_set_drvdata(con->dev, con);
3367         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3368                 error = device_create_file(con->dev, &device_attrs[i]);
3369                 if (error)
3370                         break;
3371         }
3372
3373         if (error) {
3374                 while (--i >= 0)
3375                         device_remove_file(con->dev, &device_attrs[i]);
3376                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3377         }
3378
3379         return error;
3380 }
3381
3382 static void vtconsole_deinit_device(struct con_driver *con)
3383 {
3384         int i;
3385
3386         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3387                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3388                         device_remove_file(con->dev, &device_attrs[i]);
3389                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3390         }
3391 }
3392
3393 /**
3394  * con_is_bound - checks if driver is bound to the console
3395  * @csw: console driver
3396  *
3397  * RETURNS: zero if unbound, nonzero if bound
3398  *
3399  * Drivers can call this and if zero, they should release
3400  * all resources allocated on con_startup()
3401  */
3402 int con_is_bound(const struct consw *csw)
3403 {
3404         int i, bound = 0;
3405
3406         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3407                 if (con_driver_map[i] == csw) {
3408                         bound = 1;
3409                         break;
3410                 }
3411         }
3412
3413         return bound;
3414 }
3415 EXPORT_SYMBOL(con_is_bound);
3416
3417 /**
3418  * register_con_driver - register console driver to console layer
3419  * @csw: console driver
3420  * @first: the first console to take over, minimum value is 0
3421  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3422  *
3423  * DESCRIPTION: This function registers a console driver which can later
3424  * bind to a range of consoles specified by @first and @last. It will
3425  * also initialize the console driver by calling con_startup().
3426  */
3427 int register_con_driver(const struct consw *csw, int first, int last)
3428 {
3429         struct module *owner = csw->owner;
3430         struct con_driver *con_driver;
3431         const char *desc;
3432         int i, retval = 0;
3433
3434         if (!try_module_get(owner))
3435                 return -ENODEV;
3436
3437         acquire_console_sem();
3438
3439         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3440                 con_driver = &registered_con_driver[i];
3441
3442                 /* already registered */
3443                 if (con_driver->con == csw)
3444                         retval = -EINVAL;
3445         }
3446
3447         if (retval)
3448                 goto err;
3449
3450         desc = csw->con_startup();
3451
3452         if (!desc)
3453                 goto err;
3454
3455         retval = -EINVAL;
3456
3457         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3458                 con_driver = &registered_con_driver[i];
3459
3460                 if (con_driver->con == NULL) {
3461                         con_driver->con = csw;
3462                         con_driver->desc = desc;
3463                         con_driver->node = i;
3464                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3465                                            CON_DRIVER_FLAG_INIT;
3466                         con_driver->first = first;
3467                         con_driver->last = last;
3468                         retval = 0;
3469                         break;
3470                 }
3471         }
3472
3473         if (retval)
3474                 goto err;
3475
3476         con_driver->dev = device_create(vtconsole_class, NULL,
3477                                                 MKDEV(0, con_driver->node),
3478                                                 NULL, "vtcon%i",
3479                                                 con_driver->node);
3480
3481         if (IS_ERR(con_driver->dev)) {
3482                 printk(KERN_WARNING "Unable to create device for %s; "
3483                        "errno = %ld\n", con_driver->desc,
3484                        PTR_ERR(con_driver->dev));
3485                 con_driver->dev = NULL;
3486         } else {
3487                 vtconsole_init_device(con_driver);
3488         }
3489
3490 err:
3491         release_console_sem();
3492         module_put(owner);
3493         return retval;
3494 }
3495 EXPORT_SYMBOL(register_con_driver);
3496
3497 /**
3498  * unregister_con_driver - unregister console driver from console layer
3499  * @csw: console driver
3500  *
3501  * DESCRIPTION: All drivers that registers to the console layer must
3502  * call this function upon exit, or if the console driver is in a state
3503  * where it won't be able to handle console services, such as the
3504  * framebuffer console without loaded framebuffer drivers.
3505  *
3506  * The driver must unbind first prior to unregistration.
3507  */
3508 int unregister_con_driver(const struct consw *csw)
3509 {
3510         int i, retval = -ENODEV;
3511
3512         acquire_console_sem();
3513
3514         /* cannot unregister a bound driver */
3515         if (con_is_bound(csw))
3516                 goto err;
3517
3518         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3519                 struct con_driver *con_driver = &registered_con_driver[i];
3520
3521                 if (con_driver->con == csw &&
3522                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3523                         vtconsole_deinit_device(con_driver);
3524                         device_destroy(vtconsole_class,
3525                                        MKDEV(0, con_driver->node));
3526                         con_driver->con = NULL;
3527                         con_driver->desc = NULL;
3528                         con_driver->dev = NULL;
3529                         con_driver->node = 0;
3530                         con_driver->flag = 0;
3531                         con_driver->first = 0;
3532                         con_driver->last = 0;
3533                         retval = 0;
3534                         break;
3535                 }
3536         }
3537 err:
3538         release_console_sem();
3539         return retval;
3540 }
3541 EXPORT_SYMBOL(unregister_con_driver);
3542
3543 /*
3544  *      If we support more console drivers, this function is used
3545  *      when a driver wants to take over some existing consoles
3546  *      and become default driver for newly opened ones.
3547  *
3548  *      take_over_console is basically a register followed by unbind
3549  */
3550 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3551 {
3552         int err;
3553
3554         err = register_con_driver(csw, first, last);
3555
3556         if (!err)
3557                 bind_con_driver(csw, first, last, deflt);
3558
3559         return err;
3560 }
3561
3562 /*
3563  * give_up_console is a wrapper to unregister_con_driver. It will only
3564  * work if driver is fully unbound.
3565  */
3566 void give_up_console(const struct consw *csw)
3567 {
3568         unregister_con_driver(csw);
3569 }
3570
3571 static int __init vtconsole_class_init(void)
3572 {
3573         int i;
3574
3575         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3576         if (IS_ERR(vtconsole_class)) {
3577                 printk(KERN_WARNING "Unable to create vt console class; "
3578                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3579                 vtconsole_class = NULL;
3580         }
3581
3582         /* Add system drivers to sysfs */
3583         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3584                 struct con_driver *con = &registered_con_driver[i];
3585
3586                 if (con->con && !con->dev) {
3587                         con->dev = device_create(vtconsole_class, NULL,
3588                                                          MKDEV(0, con->node),
3589                                                          NULL, "vtcon%i",
3590                                                          con->node);
3591
3592                         if (IS_ERR(con->dev)) {
3593                                 printk(KERN_WARNING "Unable to create "
3594                                        "device for %s; errno = %ld\n",
3595                                        con->desc, PTR_ERR(con->dev));
3596                                 con->dev = NULL;
3597                         } else {
3598                                 vtconsole_init_device(con);
3599                         }
3600                 }
3601         }
3602
3603         return 0;
3604 }
3605 postcore_initcall(vtconsole_class_init);
3606
3607 #endif
3608
3609 /*
3610  *      Screen blanking
3611  */
3612
3613 static int set_vesa_blanking(char __user *p)
3614 {
3615         unsigned int mode;
3616
3617         if (get_user(mode, p + 1))
3618                 return -EFAULT;
3619
3620         vesa_blank_mode = (mode < 4) ? mode : 0;
3621         return 0;
3622 }
3623
3624 void do_blank_screen(int entering_gfx)
3625 {
3626         struct vc_data *vc = vc_cons[fg_console].d;
3627         int i;
3628
3629         WARN_CONSOLE_UNLOCKED();
3630
3631         if (console_blanked) {
3632                 if (blank_state == blank_vesa_wait) {
3633                         blank_state = blank_off;
3634                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3635                 }
3636                 return;
3637         }
3638
3639         /* entering graphics mode? */
3640         if (entering_gfx) {
3641                 hide_cursor(vc);
3642                 save_screen(vc);
3643                 vc->vc_sw->con_blank(vc, -1, 1);
3644                 console_blanked = fg_console + 1;
3645                 blank_state = blank_off;
3646                 set_origin(vc);
3647                 return;
3648         }
3649
3650         if (blank_state != blank_normal_wait)
3651                 return;
3652         blank_state = blank_off;
3653
3654         /* don't blank graphics */
3655         if (vc->vc_mode != KD_TEXT) {
3656                 console_blanked = fg_console + 1;
3657                 return;
3658         }
3659
3660         hide_cursor(vc);
3661         del_timer_sync(&console_timer);
3662         blank_timer_expired = 0;
3663
3664         save_screen(vc);
3665         /* In case we need to reset origin, blanking hook returns 1 */
3666         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3667         console_blanked = fg_console + 1;
3668         if (i)
3669                 set_origin(vc);
3670
3671         if (console_blank_hook && console_blank_hook(1))
3672                 return;
3673
3674         if (vesa_off_interval && vesa_blank_mode) {
3675                 blank_state = blank_vesa_wait;
3676                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3677         }
3678         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3679 }
3680 EXPORT_SYMBOL(do_blank_screen);
3681
3682 /*
3683  * Called by timer as well as from vt_console_driver
3684  */
3685 void do_unblank_screen(int leaving_gfx)
3686 {
3687         struct vc_data *vc;
3688
3689         /* This should now always be called from a "sane" (read: can schedule)
3690          * context for the sake of the low level drivers, except in the special
3691          * case of oops_in_progress
3692          */
3693         if (!oops_in_progress)
3694                 might_sleep();
3695
3696         WARN_CONSOLE_UNLOCKED();
3697
3698         ignore_poke = 0;
3699         if (!console_blanked)
3700                 return;
3701         if (!vc_cons_allocated(fg_console)) {
3702                 /* impossible */
3703                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3704                 return;
3705         }
3706         vc = vc_cons[fg_console].d;
3707         if (vc->vc_mode != KD_TEXT)
3708                 return; /* but leave console_blanked != 0 */
3709
3710         if (blankinterval) {
3711                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3712                 blank_state = blank_normal_wait;
3713         }
3714
3715         console_blanked = 0;
3716         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3717                 /* Low-level driver cannot restore -> do it ourselves */
3718                 update_screen(vc);
3719         if (console_blank_hook)
3720                 console_blank_hook(0);
3721         set_palette(vc);
3722         set_cursor(vc);
3723         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3724 }
3725 EXPORT_SYMBOL(do_unblank_screen);
3726
3727 /*
3728  * This is called by the outside world to cause a forced unblank, mostly for
3729  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3730  * call it with 1 as an argument and so force a mode restore... that may kill
3731  * X or at least garbage the screen but would also make the Oops visible...
3732  */
3733 void unblank_screen(void)
3734 {
3735         do_unblank_screen(0);
3736 }
3737
3738 /*
3739  * We defer the timer blanking to work queue so it can take the console mutex
3740  * (console operations can still happen at irq time, but only from printk which
3741  * has the console mutex. Not perfect yet, but better than no locking
3742  */
3743 static void blank_screen_t(unsigned long dummy)
3744 {
3745         if (unlikely(!keventd_up())) {
3746                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3747                 return;
3748         }
3749         blank_timer_expired = 1;
3750         schedule_work(&console_work);
3751 }
3752
3753 void poke_blanked_console(void)
3754 {
3755         WARN_CONSOLE_UNLOCKED();
3756
3757         /* Add this so we quickly catch whoever might call us in a non
3758          * safe context. Nowadays, unblank_screen() isn't to be called in
3759          * atomic contexts and is allowed to schedule (with the special case
3760          * of oops_in_progress, but that isn't of any concern for this
3761          * function. --BenH.
3762          */
3763         might_sleep();
3764
3765         /* This isn't perfectly race free, but a race here would be mostly harmless,
3766          * at worse, we'll do a spurrious blank and it's unlikely
3767          */
3768         del_timer(&console_timer);
3769         blank_timer_expired = 0;
3770
3771         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3772                 return;
3773         if (console_blanked)
3774                 unblank_screen();
3775         else if (blankinterval) {
3776                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3777                 blank_state = blank_normal_wait;
3778         }
3779 }
3780
3781 /*
3782  *      Palettes
3783  */
3784
3785 static void set_palette(struct vc_data *vc)
3786 {
3787         WARN_CONSOLE_UNLOCKED();
3788
3789         if (vc->vc_mode != KD_GRAPHICS)
3790                 vc->vc_sw->con_set_palette(vc, color_table);
3791 }
3792
3793 static int set_get_cmap(unsigned char __user *arg, int set)
3794 {
3795     int i, j, k;
3796
3797     WARN_CONSOLE_UNLOCKED();
3798
3799     for (i = 0; i < 16; i++)
3800         if (set) {
3801             get_user(default_red[i], arg++);
3802             get_user(default_grn[i], arg++);
3803             get_user(default_blu[i], arg++);
3804         } else {
3805             put_user(default_red[i], arg++);
3806             put_user(default_grn[i], arg++);
3807             put_user(default_blu[i], arg++);
3808         }
3809     if (set) {
3810         for (i = 0; i < MAX_NR_CONSOLES; i++)
3811             if (vc_cons_allocated(i)) {
3812                 for (j = k = 0; j < 16; j++) {
3813                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3814                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3815                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3816                 }
3817                 set_palette(vc_cons[i].d);
3818             }
3819     }
3820     return 0;
3821 }
3822
3823 /*
3824  * Load palette into the DAC registers. arg points to a colour
3825  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3826  */
3827
3828 int con_set_cmap(unsigned char __user *arg)
3829 {
3830         int rc;
3831
3832         acquire_console_sem();
3833         rc = set_get_cmap (arg,1);
3834         release_console_sem();
3835
3836         return rc;
3837 }
3838
3839 int con_get_cmap(unsigned char __user *arg)
3840 {
3841         int rc;
3842
3843         acquire_console_sem();
3844         rc = set_get_cmap (arg,0);
3845         release_console_sem();
3846
3847         return rc;
3848 }
3849
3850 void reset_palette(struct vc_data *vc)
3851 {
3852         int j, k;
3853         for (j=k=0; j<16; j++) {
3854                 vc->vc_palette[k++] = default_red[j];
3855                 vc->vc_palette[k++] = default_grn[j];
3856                 vc->vc_palette[k++] = default_blu[j];
3857         }
3858         set_palette(vc);
3859 }
3860
3861 /*
3862  *  Font switching
3863  *
3864  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3865  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3866  *  depending on width) reserved for each character which is kinda wasty, but
3867  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3868  *  is upto the actual low-level console-driver convert data into its favorite
3869  *  format (maybe we should add a `fontoffset' field to the `display'
3870  *  structure so we won't have to convert the fontdata all the time.
3871  *  /Jes
3872  */
3873
3874 #define max_font_size 65536
3875
3876 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3877 {
3878         struct console_font font;
3879         int rc = -EINVAL;
3880         int c;
3881
3882         if (vc->vc_mode != KD_TEXT)
3883                 return -EINVAL;
3884
3885         if (op->data) {
3886                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3887                 if (!font.data)
3888                         return -ENOMEM;
3889         } else
3890                 font.data = NULL;
3891
3892         acquire_console_sem();
3893         if (vc->vc_sw->con_font_get)
3894                 rc = vc->vc_sw->con_font_get(vc, &font);
3895         else
3896                 rc = -ENOSYS;
3897         release_console_sem();
3898
3899         if (rc)
3900                 goto out;
3901
3902         c = (font.width+7)/8 * 32 * font.charcount;
3903
3904         if (op->data && font.charcount > op->charcount)
3905                 rc = -ENOSPC;
3906         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3907                 if (font.width > op->width || font.height > op->height)
3908                         rc = -ENOSPC;
3909         } else {
3910                 if (font.width != 8)
3911                         rc = -EIO;
3912                 else if ((op->height && font.height > op->height) ||
3913                          font.height > 32)
3914                         rc = -ENOSPC;
3915         }
3916         if (rc)
3917                 goto out;
3918
3919         op->height = font.height;
3920         op->width = font.width;
3921         op->charcount = font.charcount;
3922
3923         if (op->data && copy_to_user(op->data, font.data, c))
3924                 rc = -EFAULT;
3925
3926 out:
3927         kfree(font.data);
3928         return rc;
3929 }
3930
3931 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3932 {
3933         struct console_font font;
3934         int rc = -EINVAL;
3935         int size;
3936
3937         if (vc->vc_mode != KD_TEXT)
3938                 return -EINVAL;
3939         if (!op->data)
3940                 return -EINVAL;
3941         if (op->charcount > 512)
3942                 return -EINVAL;
3943         if (!op->height) {              /* Need to guess font height [compat] */
3944                 int h, i;
3945                 u8 __user *charmap = op->data;
3946                 u8 tmp;
3947
3948                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3949                    so that we can get rid of this soon */
3950                 if (!(op->flags & KD_FONT_FLAG_OLD))
3951                         return -EINVAL;
3952                 for (h = 32; h > 0; h--)
3953                         for (i = 0; i < op->charcount; i++) {
3954                                 if (get_user(tmp, &charmap[32*i+h-1]))
3955                                         return -EFAULT;
3956                                 if (tmp)
3957                                         goto nonzero;
3958                         }
3959                 return -EINVAL;
3960         nonzero:
3961                 op->height = h;
3962         }
3963         if (op->width <= 0 || op->width > 32 || op->height > 32)
3964                 return -EINVAL;
3965         size = (op->width+7)/8 * 32 * op->charcount;
3966         if (size > max_font_size)
3967                 return -ENOSPC;
3968         font.charcount = op->charcount;
3969         font.height = op->height;
3970         font.width = op->width;
3971         font.data = kmalloc(size, GFP_KERNEL);
3972         if (!font.data)
3973                 return -ENOMEM;
3974         if (copy_from_user(font.data, op->data, size)) {
3975                 kfree(font.data);
3976                 return -EFAULT;
3977         }
3978         acquire_console_sem();
3979         if (vc->vc_sw->con_font_set)
3980                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3981         else
3982                 rc = -ENOSYS;
3983         release_console_sem();
3984         kfree(font.data);
3985         return rc;
3986 }
3987
3988 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3989 {
3990         struct console_font font = {.width = op->width, .height = op->height};
3991         char name[MAX_FONT_NAME];
3992         char *s = name;
3993         int rc;
3994
3995         if (vc->vc_mode != KD_TEXT)
3996                 return -EINVAL;
3997
3998         if (!op->data)
3999                 s = NULL;
4000         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4001                 return -EFAULT;
4002         else
4003                 name[MAX_FONT_NAME - 1] = 0;
4004
4005         acquire_console_sem();
4006         if (vc->vc_sw->con_font_default)
4007                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4008         else
4009                 rc = -ENOSYS;
4010         release_console_sem();
4011         if (!rc) {
4012                 op->width = font.width;
4013                 op->height = font.height;
4014         }
4015         return rc;
4016 }
4017
4018 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4019 {
4020         int con = op->height;
4021         int rc;
4022
4023         if (vc->vc_mode != KD_TEXT)
4024                 return -EINVAL;
4025
4026         acquire_console_sem();
4027         if (!vc->vc_sw->con_font_copy)
4028                 rc = -ENOSYS;
4029         else if (con < 0 || !vc_cons_allocated(con))
4030                 rc = -ENOTTY;
4031         else if (con == vc->vc_num)     /* nothing to do */
4032                 rc = 0;
4033         else
4034                 rc = vc->vc_sw->con_font_copy(vc, con);
4035         release_console_sem();
4036         return rc;
4037 }
4038
4039 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4040 {
4041         switch (op->op) {
4042         case KD_FONT_OP_SET:
4043                 return con_font_set(vc, op);
4044         case KD_FONT_OP_GET:
4045                 return con_font_get(vc, op);
4046         case KD_FONT_OP_SET_DEFAULT:
4047                 return con_font_default(vc, op);
4048         case KD_FONT_OP_COPY:
4049                 return con_font_copy(vc, op);
4050         }
4051         return -ENOSYS;
4052 }
4053
4054 /*
4055  *      Interface exported to selection and vcs.
4056  */
4057
4058 /* used by selection */
4059 u16 screen_glyph(struct vc_data *vc, int offset)
4060 {
4061         u16 w = scr_readw(screenpos(vc, offset, 1));
4062         u16 c = w & 0xff;
4063
4064         if (w & vc->vc_hi_font_mask)
4065                 c |= 0x100;
4066         return c;
4067 }
4068 EXPORT_SYMBOL_GPL(screen_glyph);
4069
4070 /* used by vcs - note the word offset */
4071 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4072 {
4073         return screenpos(vc, 2 * w_offset, viewed);
4074 }
4075
4076 void getconsxy(struct vc_data *vc, unsigned char *p)
4077 {
4078         p[0] = vc->vc_x;
4079         p[1] = vc->vc_y;
4080 }
4081
4082 void putconsxy(struct vc_data *vc, unsigned char *p)
4083 {
4084         hide_cursor(vc);
4085         gotoxy(vc, p[0], p[1]);
4086         set_cursor(vc);
4087 }
4088
4089 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4090 {
4091         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4092                 return softcursor_original;
4093         return scr_readw(org);
4094 }
4095
4096 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4097 {
4098         scr_writew(val, org);
4099         if ((unsigned long)org == vc->vc_pos) {
4100                 softcursor_original = -1;
4101                 add_softcursor(vc);
4102         }
4103 }
4104
4105 /*
4106  *      Visible symbols for modules
4107  */
4108
4109 EXPORT_SYMBOL(color_table);
4110 EXPORT_SYMBOL(default_red);
4111 EXPORT_SYMBOL(default_grn);
4112 EXPORT_SYMBOL(default_blu);
4113 EXPORT_SYMBOL(update_region);
4114 EXPORT_SYMBOL(redraw_screen);
4115 EXPORT_SYMBOL(vc_resize);
4116 EXPORT_SYMBOL(fg_console);
4117 EXPORT_SYMBOL(console_blank_hook);
4118 EXPORT_SYMBOL(console_blanked);
4119 EXPORT_SYMBOL(vc_cons);
4120 EXPORT_SYMBOL(global_cursor_default);
4121 #ifndef VT_SINGLE_DRIVER
4122 EXPORT_SYMBOL(take_over_console);
4123 EXPORT_SYMBOL(give_up_console);
4124 #endif