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   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
 165 /*
 166  * ignore_poke: don't unblank the screen when things are typed.  This is
 167  * mainly for the privacy of braille terminal users.
 168  */
 169 static int ignore_poke;
 170
 171 int do_poke_blanked_console;
 172 int console_blanked;
 173
 174 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 175 static int vesa_off_interval;
 176 static int blankinterval = 10*60;
 177 core_param(consoleblank, blankinterval, int, 0444);
 178
 179 static DECLARE_WORK(console_work, console_callback);
 180
 181 /*
 182  * fg_console is the current virtual console,
 183  * last_console is the last used one,
 184  * want_console is the console we want to switch to,
 185  * kmsg_redirect is the console for kernel messages,
 186  */
 187 int fg_console;
 188 int last_console;
 189 int want_console = -1;
 190 int kmsg_redirect;
 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             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 779             vcs_make_sysfs(currcons);
 780             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 781         }
 782         return 0;
 783 }
 784
 785 static inline int resize_screen(struct vc_data *vc, int width, int height,
 786                                 int user)
 787 {
 788         /* Resizes the resolution of the display adapater */
 789         int err = 0;
 790
 791         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 792                 err = vc->vc_sw->con_resize(vc, width, height, user);
 793
 794         return err;
 795 }
 796
 797 /*
 798  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 799  * [this is to be used together with some user program
 800  * like resize that changes the hardware videomode]
 801  */
 802 #define VC_RESIZE_MAXCOL (32767)
 803 #define VC_RESIZE_MAXROW (32767)
 804
 805 /**
 806  *      vc_do_resize    -       resizing method for the tty
 807  *      @tty: tty being resized
 808  *      @real_tty: real tty (different to tty if a pty/tty pair)
 809  *      @vc: virtual console private data
 810  *      @cols: columns
 811  *      @lines: lines
 812  *
 813  *      Resize a virtual console, clipping according to the actual constraints.
 814  *      If the caller passes a tty structure then update the termios winsize
 815  *      information and perform any neccessary signal handling.
 816  *
 817  *      Caller must hold the console semaphore. Takes the termios mutex and
 818  *      ctrl_lock of the tty IFF a tty is passed.
 819  */
 820
 821 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 822                                 unsigned int cols, unsigned int lines)
 823 {
 824         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 825         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 826         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 827         unsigned int end, user;
 828         unsigned short *newscreen;
 829
 830         WARN_CONSOLE_UNLOCKED();
 831
 832         if (!vc)
 833                 return -ENXIO;
 834
 835         user = vc->vc_resize_user;
 836         vc->vc_resize_user = 0;
 837
 838         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 839                 return -EINVAL;
 840
 841         new_cols = (cols ? cols : vc->vc_cols);
 842         new_rows = (lines ? lines : vc->vc_rows);
 843         new_row_size = new_cols << 1;
 844         new_screen_size = new_row_size * new_rows;
 845
 846         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 847                 return 0;
 848
 849         newscreen = kmalloc(new_screen_size, GFP_USER);
 850         if (!newscreen)
 851                 return -ENOMEM;
 852
 853         old_rows = vc->vc_rows;
 854         old_cols = vc->vc_cols;
 855         old_row_size = vc->vc_size_row;
 856         old_screen_size = vc->vc_screenbuf_size;
 857
 858         err = resize_screen(vc, new_cols, new_rows, user);
 859         if (err) {
 860                 kfree(newscreen);
 861                 return err;
 862         }
 863
 864         vc->vc_rows = new_rows;
 865         vc->vc_cols = new_cols;
 866         vc->vc_size_row = new_row_size;
 867         vc->vc_screenbuf_size = new_screen_size;
 868
 869         rlth = min(old_row_size, new_row_size);
 870         rrem = new_row_size - rlth;
 871         old_origin = vc->vc_origin;
 872         new_origin = (long) newscreen;
 873         new_scr_end = new_origin + new_screen_size;
 874
 875         if (vc->vc_y > new_rows) {
 876                 if (old_rows - vc->vc_y < new_rows) {
 877                         /*
 878                          * Cursor near the bottom, copy contents from the
 879                          * bottom of buffer
 880                          */
 881                         old_origin += (old_rows - new_rows) * old_row_size;
 882                         end = vc->vc_scr_end;
 883                 } else {
 884                         /*
 885                          * Cursor is in no man's land, copy 1/2 screenful
 886                          * from the top and bottom of cursor position
 887                          */
 888                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 889                         end = old_origin + (old_row_size * new_rows);
 890                 }
 891         } else
 892                 /*
 893                  * Cursor near the top, copy contents from the top of buffer
 894                  */
 895                 end = (old_rows > new_rows) ? old_origin +
 896                         (old_row_size * new_rows) :
 897                         vc->vc_scr_end;
 898
 899         update_attr(vc);
 900
 901         while (old_origin < end) {
 902                 scr_memcpyw((unsigned short *) new_origin,
 903                             (unsigned short *) old_origin, rlth);
 904                 if (rrem)
 905                         scr_memsetw((void *)(new_origin + rlth),
 906                                     vc->vc_video_erase_char, rrem);
 907                 old_origin += old_row_size;
 908                 new_origin += new_row_size;
 909         }
 910         if (new_scr_end > new_origin)
 911                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 912                             new_scr_end - new_origin);
 913         kfree(vc->vc_screenbuf);
 914         vc->vc_screenbuf = newscreen;
 915         vc->vc_screenbuf_size = new_screen_size;
 916         set_origin(vc);
 917
 918         /* do part of a reset_terminal() */
 919         vc->vc_top = 0;
 920         vc->vc_bottom = vc->vc_rows;
 921         gotoxy(vc, vc->vc_x, vc->vc_y);
 922         save_cur(vc);
 923
 924         if (tty) {
 925                 /* Rewrite the requested winsize data with the actual
 926                    resulting sizes */
 927                 struct winsize ws;
 928                 memset(&ws, 0, sizeof(ws));
 929                 ws.ws_row = vc->vc_rows;
 930                 ws.ws_col = vc->vc_cols;
 931                 ws.ws_ypixel = vc->vc_scan_lines;
 932                 tty_do_resize(tty, &ws);
 933         }
 934
 935         if (CON_IS_VISIBLE(vc))
 936                 update_screen(vc);
 937         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 938         return err;
 939 }
 940
 941 /**
 942  *      vc_resize               -       resize a VT
 943  *      @vc: virtual console
 944  *      @cols: columns
 945  *      @rows: rows
 946  *
 947  *      Resize a virtual console as seen from the console end of things. We
 948  *      use the common vc_do_resize methods to update the structures. The
 949  *      caller must hold the console sem to protect console internals and
 950  *      vc->vc_tty
 951  */
 952
 953 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 954 {
 955         return vc_do_resize(vc->vc_tty, vc, cols, rows);
 956 }
 957
 958 /**
 959  *      vt_resize               -       resize a VT
 960  *      @tty: tty to resize
 961  *      @ws: winsize attributes
 962  *
 963  *      Resize a virtual terminal. This is called by the tty layer as we
 964  *      register our own handler for resizing. The mutual helper does all
 965  *      the actual work.
 966  *
 967  *      Takes the console sem and the called methods then take the tty
 968  *      termios_mutex and the tty ctrl_lock in that order.
 969  */
 970 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 971 {
 972         struct vc_data *vc = tty->driver_data;
 973         int ret;
 974
 975         acquire_console_sem();
 976         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 977         release_console_sem();
 978         return ret;
 979 }
 980
 981 void vc_deallocate(unsigned int currcons)
 982 {
 983         WARN_CONSOLE_UNLOCKED();
 984
 985         if (vc_cons_allocated(currcons)) {
 986                 struct vc_data *vc = vc_cons[currcons].d;
 987                 struct vt_notifier_param param = { .vc = vc };
 988
 989                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 990                 vcs_remove_sysfs(currcons);
 991                 vc->vc_sw->con_deinit(vc);
 992                 put_pid(vc->vt_pid);
 993                 module_put(vc->vc_sw->owner);
 994                 kfree(vc->vc_screenbuf);
 995                 if (currcons >= MIN_NR_CONSOLES)
 996                         kfree(vc);
 997                 vc_cons[currcons].d = NULL;
 998         }
 999 }
1000
1001 /*
1002  *      VT102 emulator
1003  */
1004
1005 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1006 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1007 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1008
1009 #define decarm          VC_REPEAT
1010 #define decckm          VC_CKMODE
1011 #define kbdapplic       VC_APPLIC
1012 #define lnm             VC_CRLF
1013
1014 /*
1015  * this is what the terminal answers to a ESC-Z or csi0c query.
1016  */
1017 #define VT100ID "\033[?1;2c"
1018 #define VT102ID "\033[?6c"
1019
1020 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1021                                        8,12,10,14, 9,13,11,15 };
1022
1023 /* the default colour table, for VGA+ colour systems */
1024 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1025     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1026 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1027     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1028 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1029     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1030
1031 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1032 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1033 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1034
1035 /*
1036  * gotoxy() must verify all boundaries, because the arguments
1037  * might also be negative. If the given position is out of
1038  * bounds, the cursor is placed at the nearest margin.
1039  */
1040 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1041 {
1042         int min_y, max_y;
1043
1044         if (new_x < 0)
1045                 vc->vc_x = 0;
1046         else {
1047                 if (new_x >= vc->vc_cols)
1048                         vc->vc_x = vc->vc_cols - 1;
1049                 else
1050                         vc->vc_x = new_x;
1051         }
1052
1053         if (vc->vc_decom) {
1054                 min_y = vc->vc_top;
1055                 max_y = vc->vc_bottom;
1056         } else {
1057                 min_y = 0;
1058                 max_y = vc->vc_rows;
1059         }
1060         if (new_y < min_y)
1061                 vc->vc_y = min_y;
1062         else if (new_y >= max_y)
1063                 vc->vc_y = max_y - 1;
1064         else
1065                 vc->vc_y = new_y;
1066         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1067         vc->vc_need_wrap = 0;
1068 }
1069
1070 /* for absolute user moves, when decom is set */
1071 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1072 {
1073         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1074 }
1075
1076 void scrollback(struct vc_data *vc, int lines)
1077 {
1078         if (!lines)
1079                 lines = vc->vc_rows / 2;
1080         scrolldelta(-lines);
1081 }
1082
1083 void scrollfront(struct vc_data *vc, int lines)
1084 {
1085         if (!lines)
1086                 lines = vc->vc_rows / 2;
1087         scrolldelta(lines);
1088 }
1089
1090 static void lf(struct vc_data *vc)
1091 {
1092         /* don't scroll if above bottom of scrolling region, or
1093          * if below scrolling region
1094          */
1095         if (vc->vc_y + 1 == vc->vc_bottom)
1096                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1097         else if (vc->vc_y < vc->vc_rows - 1) {
1098                 vc->vc_y++;
1099                 vc->vc_pos += vc->vc_size_row;
1100         }
1101         vc->vc_need_wrap = 0;
1102         notify_write(vc, '\n');
1103 }
1104
1105 static void ri(struct vc_data *vc)
1106 {
1107         /* don't scroll if below top of scrolling region, or
1108          * if above scrolling region
1109          */
1110         if (vc->vc_y == vc->vc_top)
1111                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1112         else if (vc->vc_y > 0) {
1113                 vc->vc_y--;
1114                 vc->vc_pos -= vc->vc_size_row;
1115         }
1116         vc->vc_need_wrap = 0;
1117 }
1118
1119 static inline void cr(struct vc_data *vc)
1120 {
1121         vc->vc_pos -= vc->vc_x << 1;
1122         vc->vc_need_wrap = vc->vc_x = 0;
1123         notify_write(vc, '\r');
1124 }
1125
1126 static inline void bs(struct vc_data *vc)
1127 {
1128         if (vc->vc_x) {
1129                 vc->vc_pos -= 2;
1130                 vc->vc_x--;
1131                 vc->vc_need_wrap = 0;
1132                 notify_write(vc, '\b');
1133         }
1134 }
1135
1136 static inline void del(struct vc_data *vc)
1137 {
1138         /* ignored */
1139 }
1140
1141 static void csi_J(struct vc_data *vc, int vpar)
1142 {
1143         unsigned int count;
1144         unsigned short * start;
1145
1146         switch (vpar) {
1147                 case 0: /* erase from cursor to end of display */
1148                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1149                         start = (unsigned short *)vc->vc_pos;
1150                         if (DO_UPDATE(vc)) {
1151                                 /* do in two stages */
1152                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1153                                               vc->vc_cols - vc->vc_x);
1154                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1155                                               vc->vc_rows - vc->vc_y - 1,
1156                                               vc->vc_cols);
1157                         }
1158                         break;
1159                 case 1: /* erase from start to cursor */
1160                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1161                         start = (unsigned short *)vc->vc_origin;
1162                         if (DO_UPDATE(vc)) {
1163                                 /* do in two stages */
1164                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1165                                               vc->vc_cols);
1166                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1167                                               vc->vc_x + 1);
1168                         }
1169                         break;
1170                 case 2: /* erase whole display */
1171                         count = vc->vc_cols * vc->vc_rows;
1172                         start = (unsigned short *)vc->vc_origin;
1173                         if (DO_UPDATE(vc))
1174                                 vc->vc_sw->con_clear(vc, 0, 0,
1175                                               vc->vc_rows,
1176                                               vc->vc_cols);
1177                         break;
1178                 default:
1179                         return;
1180         }
1181         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1182         vc->vc_need_wrap = 0;
1183 }
1184
1185 static void csi_K(struct vc_data *vc, int vpar)
1186 {
1187         unsigned int count;
1188         unsigned short * start;
1189
1190         switch (vpar) {
1191                 case 0: /* erase from cursor to end of line */
1192                         count = vc->vc_cols - vc->vc_x;
1193                         start = (unsigned short *)vc->vc_pos;
1194                         if (DO_UPDATE(vc))
1195                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1196                                                      vc->vc_cols - vc->vc_x);
1197                         break;
1198                 case 1: /* erase from start of line to cursor */
1199                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1200                         count = vc->vc_x + 1;
1201                         if (DO_UPDATE(vc))
1202                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1203                                                      vc->vc_x + 1);
1204                         break;
1205                 case 2: /* erase whole line */
1206                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1207                         count = vc->vc_cols;
1208                         if (DO_UPDATE(vc))
1209                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1210                                               vc->vc_cols);
1211                         break;
1212                 default:
1213                         return;
1214         }
1215         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1216         vc->vc_need_wrap = 0;
1217 }
1218
1219 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1220 {                                         /* not vt100? */
1221         int count;
1222
1223         if (!vpar)
1224                 vpar++;
1225         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1226
1227         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1228         if (DO_UPDATE(vc))
1229                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1230         vc->vc_need_wrap = 0;
1231 }
1232
1233 static void default_attr(struct vc_data *vc)
1234 {
1235         vc->vc_intensity = 1;
1236         vc->vc_italic = 0;
1237         vc->vc_underline = 0;
1238         vc->vc_reverse = 0;
1239         vc->vc_blink = 0;
1240         vc->vc_color = vc->vc_def_color;
1241 }
1242
1243 /* console_sem is held */
1244 static void csi_m(struct vc_data *vc)
1245 {
1246         int i;
1247
1248         for (i = 0; i <= vc->vc_npar; i++)
1249                 switch (vc->vc_par[i]) {
1250                         case 0: /* all attributes off */
1251                                 default_attr(vc);
1252                                 break;
1253                         case 1:
1254                                 vc->vc_intensity = 2;
1255                                 break;
1256                         case 2:
1257                                 vc->vc_intensity = 0;
1258                                 break;
1259                         case 3:
1260                                 vc->vc_italic = 1;
1261                                 break;
1262                         case 4:
1263                                 vc->vc_underline = 1;
1264                                 break;
1265                         case 5:
1266                                 vc->vc_blink = 1;
1267                                 break;
1268                         case 7:
1269                                 vc->vc_reverse = 1;
1270                                 break;
1271                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1272                                   * Select primary font, don't display
1273                                   * control chars if defined, don't set
1274                                   * bit 8 on output.
1275                                   */
1276                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1277                                                 ? vc->vc_G0_charset
1278                                                 : vc->vc_G1_charset, vc);
1279                                 vc->vc_disp_ctrl = 0;
1280                                 vc->vc_toggle_meta = 0;
1281                                 break;
1282                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1283                                   * Select first alternate font, lets
1284                                   * chars < 32 be displayed as ROM chars.
1285                                   */
1286                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1287                                 vc->vc_disp_ctrl = 1;
1288                                 vc->vc_toggle_meta = 0;
1289                                 break;
1290                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1291                                   * Select second alternate font, toggle
1292                                   * high bit before displaying as ROM char.
1293                                   */
1294                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1295                                 vc->vc_disp_ctrl = 1;
1296                                 vc->vc_toggle_meta = 1;
1297                                 break;
1298                         case 21:
1299                         case 22:
1300                                 vc->vc_intensity = 1;
1301                                 break;
1302                         case 23:
1303                                 vc->vc_italic = 0;
1304                                 break;
1305                         case 24:
1306                                 vc->vc_underline = 0;
1307                                 break;
1308                         case 25:
1309                                 vc->vc_blink = 0;
1310                                 break;
1311                         case 27:
1312                                 vc->vc_reverse = 0;
1313                                 break;
1314                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1315                                   * Enables underscore, white foreground
1316                                   * with white underscore (Linux - use
1317                                   * default foreground).
1318                                   */
1319                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1320                                 vc->vc_underline = 1;
1321                                 break;
1322                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1323                                   * Disable underline option.
1324                                   * Reset colour to default? It did this
1325                                   * before...
1326                                   */
1327                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1328                                 vc->vc_underline = 0;
1329                                 break;
1330                         case 49:
1331                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1332                                 break;
1333                         default:
1334                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1335                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1336                                                 | (vc->vc_color & 0xf0);
1337                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1338                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1339                                                 | (vc->vc_color & 0x0f);
1340                                 break;
1341                 }
1342         update_attr(vc);
1343 }
1344
1345 static void respond_string(const char *p, struct tty_struct *tty)
1346 {
1347         while (*p) {
1348                 tty_insert_flip_char(tty, *p, 0);
1349                 p++;
1350         }
1351         con_schedule_flip(tty);
1352 }
1353
1354 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1355 {
1356         char buf[40];
1357
1358         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1359         respond_string(buf, tty);
1360 }
1361
1362 static inline void status_report(struct tty_struct *tty)
1363 {
1364         respond_string("\033[0n", tty); /* Terminal ok */
1365 }
1366
1367 static inline void respond_ID(struct tty_struct * tty)
1368 {
1369         respond_string(VT102ID, tty);
1370 }
1371
1372 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1373 {
1374         char buf[8];
1375
1376         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1377                 (char)('!' + mry));
1378         respond_string(buf, tty);
1379 }
1380
1381 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1382 int mouse_reporting(void)
1383 {
1384         return vc_cons[fg_console].d->vc_report_mouse;
1385 }
1386
1387 /* console_sem is held */
1388 static void set_mode(struct vc_data *vc, int on_off)
1389 {
1390         int i;
1391
1392         for (i = 0; i <= vc->vc_npar; i++)
1393                 if (vc->vc_ques) {
1394                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1395                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1396                                 if (on_off)
1397                                         set_kbd(vc, decckm);
1398                                 else
1399                                         clr_kbd(vc, decckm);
1400                                 break;
1401                         case 3: /* 80/132 mode switch unimplemented */
1402                                 vc->vc_deccolm = on_off;
1403 #if 0
1404                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1405                                 /* this alone does not suffice; some user mode
1406                                    utility has to change the hardware regs */
1407 #endif
1408                                 break;
1409                         case 5:                 /* Inverted screen on/off */
1410                                 if (vc->vc_decscnm != on_off) {
1411                                         vc->vc_decscnm = on_off;
1412                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1413                                         update_attr(vc);
1414                                 }
1415                                 break;
1416                         case 6:                 /* Origin relative/absolute */
1417                                 vc->vc_decom = on_off;
1418                                 gotoxay(vc, 0, 0);
1419                                 break;
1420                         case 7:                 /* Autowrap on/off */
1421                                 vc->vc_decawm = on_off;
1422                                 break;
1423                         case 8:                 /* Autorepeat on/off */
1424                                 if (on_off)
1425                                         set_kbd(vc, decarm);
1426                                 else
1427                                         clr_kbd(vc, decarm);
1428                                 break;
1429                         case 9:
1430                                 vc->vc_report_mouse = on_off ? 1 : 0;
1431                                 break;
1432                         case 25:                /* Cursor on/off */
1433                                 vc->vc_deccm = on_off;
1434                                 break;
1435                         case 1000:
1436                                 vc->vc_report_mouse = on_off ? 2 : 0;
1437                                 break;
1438                         }
1439                 } else {
1440                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1441                         case 3:                 /* Monitor (display ctrls) */
1442                                 vc->vc_disp_ctrl = on_off;
1443                                 break;
1444                         case 4:                 /* Insert Mode on/off */
1445                                 vc->vc_decim = on_off;
1446                                 break;
1447                         case 20:                /* Lf, Enter == CrLf/Lf */
1448                                 if (on_off)
1449                                         set_kbd(vc, lnm);
1450                                 else
1451                                         clr_kbd(vc, lnm);
1452                                 break;
1453                         }
1454                 }
1455 }
1456
1457 /* console_sem is held */
1458 static void setterm_command(struct vc_data *vc)
1459 {
1460         switch(vc->vc_par[0]) {
1461                 case 1: /* set color for underline mode */
1462                         if (vc->vc_can_do_color &&
1463                                         vc->vc_par[1] < 16) {
1464                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1465                                 if (vc->vc_underline)
1466                                         update_attr(vc);
1467                         }
1468                         break;
1469                 case 2: /* set color for half intensity mode */
1470                         if (vc->vc_can_do_color &&
1471                                         vc->vc_par[1] < 16) {
1472                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1473                                 if (vc->vc_intensity == 0)
1474                                         update_attr(vc);
1475                         }
1476                         break;
1477                 case 8: /* store colors as defaults */
1478                         vc->vc_def_color = vc->vc_attr;
1479                         if (vc->vc_hi_font_mask == 0x100)
1480                                 vc->vc_def_color >>= 1;
1481                         default_attr(vc);
1482                         update_attr(vc);
1483                         break;
1484                 case 9: /* set blanking interval */
1485                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1486                         poke_blanked_console();
1487                         break;
1488                 case 10: /* set bell frequency in Hz */
1489                         if (vc->vc_npar >= 1)
1490                                 vc->vc_bell_pitch = vc->vc_par[1];
1491                         else
1492                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1493                         break;
1494                 case 11: /* set bell duration in msec */
1495                         if (vc->vc_npar >= 1)
1496                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1497                                         vc->vc_par[1] * HZ / 1000 : 0;
1498                         else
1499                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1500                         break;
1501                 case 12: /* bring specified console to the front */
1502                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1503                                 set_console(vc->vc_par[1] - 1);
1504                         break;
1505                 case 13: /* unblank the screen */
1506                         poke_blanked_console();
1507                         break;
1508                 case 14: /* set vesa powerdown interval */
1509                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1510                         break;
1511                 case 15: /* activate the previous console */
1512                         set_console(last_console);
1513                         break;
1514         }
1515 }
1516
1517 /* console_sem is held */
1518 static void csi_at(struct vc_data *vc, unsigned int nr)
1519 {
1520         if (nr > vc->vc_cols - vc->vc_x)
1521                 nr = vc->vc_cols - vc->vc_x;
1522         else if (!nr)
1523                 nr = 1;
1524         insert_char(vc, nr);
1525 }
1526
1527 /* console_sem is held */
1528 static void csi_L(struct vc_data *vc, unsigned int nr)
1529 {
1530         if (nr > vc->vc_rows - vc->vc_y)
1531                 nr = vc->vc_rows - vc->vc_y;
1532         else if (!nr)
1533                 nr = 1;
1534         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1535         vc->vc_need_wrap = 0;
1536 }
1537
1538 /* console_sem is held */
1539 static void csi_P(struct vc_data *vc, unsigned int nr)
1540 {
1541         if (nr > vc->vc_cols - vc->vc_x)
1542                 nr = vc->vc_cols - vc->vc_x;
1543         else if (!nr)
1544                 nr = 1;
1545         delete_char(vc, nr);
1546 }
1547
1548 /* console_sem is held */
1549 static void csi_M(struct vc_data *vc, unsigned int nr)
1550 {
1551         if (nr > vc->vc_rows - vc->vc_y)
1552                 nr = vc->vc_rows - vc->vc_y;
1553         else if (!nr)
1554                 nr=1;
1555         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1556         vc->vc_need_wrap = 0;
1557 }
1558
1559 /* console_sem is held (except via vc_init->reset_terminal */
1560 static void save_cur(struct vc_data *vc)
1561 {
1562         vc->vc_saved_x          = vc->vc_x;
1563         vc->vc_saved_y          = vc->vc_y;
1564         vc->vc_s_intensity      = vc->vc_intensity;
1565         vc->vc_s_italic         = vc->vc_italic;
1566         vc->vc_s_underline      = vc->vc_underline;
1567         vc->vc_s_blink          = vc->vc_blink;
1568         vc->vc_s_reverse        = vc->vc_reverse;
1569         vc->vc_s_charset        = vc->vc_charset;
1570         vc->vc_s_color          = vc->vc_color;
1571         vc->vc_saved_G0         = vc->vc_G0_charset;
1572         vc->vc_saved_G1         = vc->vc_G1_charset;
1573 }
1574
1575 /* console_sem is held */
1576 static void restore_cur(struct vc_data *vc)
1577 {
1578         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1579         vc->vc_intensity        = vc->vc_s_intensity;
1580         vc->vc_italic           = vc->vc_s_italic;
1581         vc->vc_underline        = vc->vc_s_underline;
1582         vc->vc_blink            = vc->vc_s_blink;
1583         vc->vc_reverse          = vc->vc_s_reverse;
1584         vc->vc_charset          = vc->vc_s_charset;
1585         vc->vc_color            = vc->vc_s_color;
1586         vc->vc_G0_charset       = vc->vc_saved_G0;
1587         vc->vc_G1_charset       = vc->vc_saved_G1;
1588         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1589         update_attr(vc);
1590         vc->vc_need_wrap = 0;
1591 }
1592
1593 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1594         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1595         ESpalette };
1596
1597 /* console_sem is held (except via vc_init()) */
1598 static void reset_terminal(struct vc_data *vc, int do_clear)
1599 {
1600         vc->vc_top              = 0;
1601         vc->vc_bottom           = vc->vc_rows;
1602         vc->vc_state            = ESnormal;
1603         vc->vc_ques             = 0;
1604         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1605         vc->vc_G0_charset       = LAT1_MAP;
1606         vc->vc_G1_charset       = GRAF_MAP;
1607         vc->vc_charset          = 0;
1608         vc->vc_need_wrap        = 0;
1609         vc->vc_report_mouse     = 0;
1610         vc->vc_utf              = default_utf8;
1611         vc->vc_utf_count        = 0;
1612
1613         vc->vc_disp_ctrl        = 0;
1614         vc->vc_toggle_meta      = 0;
1615
1616         vc->vc_decscnm          = 0;
1617         vc->vc_decom            = 0;
1618         vc->vc_decawm           = 1;
1619         vc->vc_deccm            = 1;
1620         vc->vc_decim            = 0;
1621
1622         set_kbd(vc, decarm);
1623         clr_kbd(vc, decckm);
1624         clr_kbd(vc, kbdapplic);
1625         clr_kbd(vc, lnm);
1626         kbd_table[vc->vc_num].lockstate = 0;
1627         kbd_table[vc->vc_num].slockstate = 0;
1628         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1629         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1630         /* do not do set_leds here because this causes an endless tasklet loop
1631            when the keyboard hasn't been initialized yet */
1632
1633         vc->vc_cursor_type = CUR_DEFAULT;
1634         vc->vc_complement_mask = vc->vc_s_complement_mask;
1635
1636         default_attr(vc);
1637         update_attr(vc);
1638
1639         vc->vc_tab_stop[0]      = 0x01010100;
1640         vc->vc_tab_stop[1]      =
1641         vc->vc_tab_stop[2]      =
1642         vc->vc_tab_stop[3]      =
1643         vc->vc_tab_stop[4]      =
1644         vc->vc_tab_stop[5]      =
1645         vc->vc_tab_stop[6]      =
1646         vc->vc_tab_stop[7]      = 0x01010101;
1647
1648         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1649         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1650
1651         gotoxy(vc, 0, 0);
1652         save_cur(vc);
1653         if (do_clear)
1654             csi_J(vc, 2);
1655 }
1656
1657 /* console_sem is held */
1658 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1659 {
1660         /*
1661          *  Control characters can be used in the _middle_
1662          *  of an escape sequence.
1663          */
1664         switch (c) {
1665         case 0:
1666                 return;
1667         case 7:
1668                 if (vc->vc_bell_duration)
1669                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1670                 return;
1671         case 8:
1672                 bs(vc);
1673                 return;
1674         case 9:
1675                 vc->vc_pos -= (vc->vc_x << 1);
1676                 while (vc->vc_x < vc->vc_cols - 1) {
1677                         vc->vc_x++;
1678                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1679                                 break;
1680                 }
1681                 vc->vc_pos += (vc->vc_x << 1);
1682                 notify_write(vc, '\t');
1683                 return;
1684         case 10: case 11: case 12:
1685                 lf(vc);
1686                 if (!is_kbd(vc, lnm))
1687                         return;
1688         case 13:
1689                 cr(vc);
1690                 return;
1691         case 14:
1692                 vc->vc_charset = 1;
1693                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1694                 vc->vc_disp_ctrl = 1;
1695                 return;
1696         case 15:
1697                 vc->vc_charset = 0;
1698                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1699                 vc->vc_disp_ctrl = 0;
1700                 return;
1701         case 24: case 26:
1702                 vc->vc_state = ESnormal;
1703                 return;
1704         case 27:
1705                 vc->vc_state = ESesc;
1706                 return;
1707         case 127:
1708                 del(vc);
1709                 return;
1710         case 128+27:
1711                 vc->vc_state = ESsquare;
1712                 return;
1713         }
1714         switch(vc->vc_state) {
1715         case ESesc:
1716                 vc->vc_state = ESnormal;
1717                 switch (c) {
1718                 case '[':
1719                         vc->vc_state = ESsquare;
1720                         return;
1721                 case ']':
1722                         vc->vc_state = ESnonstd;
1723                         return;
1724                 case '%':
1725                         vc->vc_state = ESpercent;
1726                         return;
1727                 case 'E':
1728                         cr(vc);
1729                         lf(vc);
1730                         return;
1731                 case 'M':
1732                         ri(vc);
1733                         return;
1734                 case 'D':
1735                         lf(vc);
1736                         return;
1737                 case 'H':
1738                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1739                         return;
1740                 case 'Z':
1741                         respond_ID(tty);
1742                         return;
1743                 case '7':
1744                         save_cur(vc);
1745                         return;
1746                 case '8':
1747                         restore_cur(vc);
1748                         return;
1749                 case '(':
1750                         vc->vc_state = ESsetG0;
1751                         return;
1752                 case ')':
1753                         vc->vc_state = ESsetG1;
1754                         return;
1755                 case '#':
1756                         vc->vc_state = EShash;
1757                         return;
1758                 case 'c':
1759                         reset_terminal(vc, 1);
1760                         return;
1761                 case '>':  /* Numeric keypad */
1762                         clr_kbd(vc, kbdapplic);
1763                         return;
1764                 case '=':  /* Appl. keypad */
1765                         set_kbd(vc, kbdapplic);
1766                         return;
1767                 }
1768                 return;
1769         case ESnonstd:
1770                 if (c=='P') {   /* palette escape sequence */
1771                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1772                                 vc->vc_par[vc->vc_npar] = 0;
1773                         vc->vc_npar = 0;
1774                         vc->vc_state = ESpalette;
1775                         return;
1776                 } else if (c=='R') {   /* reset palette */
1777                         reset_palette(vc);
1778                         vc->vc_state = ESnormal;
1779                 } else
1780                         vc->vc_state = ESnormal;
1781                 return;
1782         case ESpalette:
1783                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1784                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1785                         if (vc->vc_npar == 7) {
1786                                 int i = vc->vc_par[0] * 3, j = 1;
1787                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1788                                 vc->vc_palette[i++] += vc->vc_par[j++];
1789                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1790                                 vc->vc_palette[i++] += vc->vc_par[j++];
1791                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1792                                 vc->vc_palette[i] += vc->vc_par[j];
1793                                 set_palette(vc);
1794                                 vc->vc_state = ESnormal;
1795                         }
1796                 } else
1797                         vc->vc_state = ESnormal;
1798                 return;
1799         case ESsquare:
1800                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1801                         vc->vc_par[vc->vc_npar] = 0;
1802                 vc->vc_npar = 0;
1803                 vc->vc_state = ESgetpars;
1804                 if (c == '[') { /* Function key */
1805                         vc->vc_state=ESfunckey;
1806                         return;
1807                 }
1808                 vc->vc_ques = (c == '?');
1809                 if (vc->vc_ques)
1810                         return;
1811         case ESgetpars:
1812                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1813                         vc->vc_npar++;
1814                         return;
1815                 } else if (c>='0' && c<='9') {
1816                         vc->vc_par[vc->vc_npar] *= 10;
1817                         vc->vc_par[vc->vc_npar] += c - '0';
1818                         return;
1819                 } else
1820                         vc->vc_state = ESgotpars;
1821         case ESgotpars:
1822                 vc->vc_state = ESnormal;
1823                 switch(c) {
1824                 case 'h':
1825                         set_mode(vc, 1);
1826                         return;
1827                 case 'l':
1828                         set_mode(vc, 0);
1829                         return;
1830                 case 'c':
1831                         if (vc->vc_ques) {
1832                                 if (vc->vc_par[0])
1833                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1834                                 else
1835                                         vc->vc_cursor_type = CUR_DEFAULT;
1836                                 return;
1837                         }
1838                         break;
1839                 case 'm':
1840                         if (vc->vc_ques) {
1841                                 clear_selection();
1842                                 if (vc->vc_par[0])
1843                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1844                                 else
1845                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1846                                 return;
1847                         }
1848                         break;
1849                 case 'n':
1850                         if (!vc->vc_ques) {
1851                                 if (vc->vc_par[0] == 5)
1852                                         status_report(tty);
1853                                 else if (vc->vc_par[0] == 6)
1854                                         cursor_report(vc, tty);
1855                         }
1856                         return;
1857                 }
1858                 if (vc->vc_ques) {
1859                         vc->vc_ques = 0;
1860                         return;
1861                 }
1862                 switch(c) {
1863                 case 'G': case '`':
1864                         if (vc->vc_par[0])
1865                                 vc->vc_par[0]--;
1866                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1867                         return;
1868                 case 'A':
1869                         if (!vc->vc_par[0])
1870                                 vc->vc_par[0]++;
1871                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1872                         return;
1873                 case 'B': case 'e':
1874                         if (!vc->vc_par[0])
1875                                 vc->vc_par[0]++;
1876                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1877                         return;
1878                 case 'C': case 'a':
1879                         if (!vc->vc_par[0])
1880                                 vc->vc_par[0]++;
1881                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1882                         return;
1883                 case 'D':
1884                         if (!vc->vc_par[0])
1885                                 vc->vc_par[0]++;
1886                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1887                         return;
1888                 case 'E':
1889                         if (!vc->vc_par[0])
1890                                 vc->vc_par[0]++;
1891                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1892                         return;
1893                 case 'F':
1894                         if (!vc->vc_par[0])
1895                                 vc->vc_par[0]++;
1896                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1897                         return;
1898                 case 'd':
1899                         if (vc->vc_par[0])
1900                                 vc->vc_par[0]--;
1901                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1902                         return;
1903                 case 'H': case 'f':
1904                         if (vc->vc_par[0])
1905                                 vc->vc_par[0]--;
1906                         if (vc->vc_par[1])
1907                                 vc->vc_par[1]--;
1908                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1909                         return;
1910                 case 'J':
1911                         csi_J(vc, vc->vc_par[0]);
1912                         return;
1913                 case 'K':
1914                         csi_K(vc, vc->vc_par[0]);
1915                         return;
1916                 case 'L':
1917                         csi_L(vc, vc->vc_par[0]);
1918                         return;
1919                 case 'M':
1920                         csi_M(vc, vc->vc_par[0]);
1921                         return;
1922                 case 'P':
1923                         csi_P(vc, vc->vc_par[0]);
1924                         return;
1925                 case 'c':
1926                         if (!vc->vc_par[0])
1927                                 respond_ID(tty);
1928                         return;
1929                 case 'g':
1930                         if (!vc->vc_par[0])
1931                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1932                         else if (vc->vc_par[0] == 3) {
1933                                 vc->vc_tab_stop[0] =
1934                                         vc->vc_tab_stop[1] =
1935                                         vc->vc_tab_stop[2] =
1936                                         vc->vc_tab_stop[3] =
1937                                         vc->vc_tab_stop[4] =
1938                                         vc->vc_tab_stop[5] =
1939                                         vc->vc_tab_stop[6] =
1940                                         vc->vc_tab_stop[7] = 0;
1941                         }
1942                         return;
1943                 case 'm':
1944                         csi_m(vc);
1945                         return;
1946                 case 'q': /* DECLL - but only 3 leds */
1947                         /* map 0,1,2,3 to 0,1,2,4 */
1948                         if (vc->vc_par[0] < 4)
1949                                 setledstate(kbd_table + vc->vc_num,
1950                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1951                         return;
1952                 case 'r':
1953                         if (!vc->vc_par[0])
1954                                 vc->vc_par[0]++;
1955                         if (!vc->vc_par[1])
1956                                 vc->vc_par[1] = vc->vc_rows;
1957                         /* Minimum allowed region is 2 lines */
1958                         if (vc->vc_par[0] < vc->vc_par[1] &&
1959                             vc->vc_par[1] <= vc->vc_rows) {
1960                                 vc->vc_top = vc->vc_par[0] - 1;
1961                                 vc->vc_bottom = vc->vc_par[1];
1962                                 gotoxay(vc, 0, 0);
1963                         }
1964                         return;
1965                 case 's':
1966                         save_cur(vc);
1967                         return;
1968                 case 'u':
1969                         restore_cur(vc);
1970                         return;
1971                 case 'X':
1972                         csi_X(vc, vc->vc_par[0]);
1973                         return;
1974                 case '@':
1975                         csi_at(vc, vc->vc_par[0]);
1976                         return;
1977                 case ']': /* setterm functions */
1978                         setterm_command(vc);
1979                         return;
1980                 }
1981                 return;
1982         case ESpercent:
1983                 vc->vc_state = ESnormal;
1984                 switch (c) {
1985                 case '@':  /* defined in ISO 2022 */
1986                         vc->vc_utf = 0;
1987                         return;
1988                 case 'G':  /* prelim official escape code */
1989                 case '8':  /* retained for compatibility */
1990                         vc->vc_utf = 1;
1991                         return;
1992                 }
1993                 return;
1994         case ESfunckey:
1995                 vc->vc_state = ESnormal;
1996                 return;
1997         case EShash:
1998                 vc->vc_state = ESnormal;
1999                 if (c == '8') {
2000                         /* DEC screen alignment test. kludge :-) */
2001                         vc->vc_video_erase_char =
2002                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2003                         csi_J(vc, 2);
2004                         vc->vc_video_erase_char =
2005                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2006                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2007                 }
2008                 return;
2009         case ESsetG0:
2010                 if (c == '0')
2011                         vc->vc_G0_charset = GRAF_MAP;
2012                 else if (c == 'B')
2013                         vc->vc_G0_charset = LAT1_MAP;
2014                 else if (c == 'U')
2015                         vc->vc_G0_charset = IBMPC_MAP;
2016                 else if (c == 'K')
2017                         vc->vc_G0_charset = USER_MAP;
2018                 if (vc->vc_charset == 0)
2019                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2020                 vc->vc_state = ESnormal;
2021                 return;
2022         case ESsetG1:
2023                 if (c == '0')
2024                         vc->vc_G1_charset = GRAF_MAP;
2025                 else if (c == 'B')
2026                         vc->vc_G1_charset = LAT1_MAP;
2027                 else if (c == 'U')
2028                         vc->vc_G1_charset = IBMPC_MAP;
2029                 else if (c == 'K')
2030                         vc->vc_G1_charset = USER_MAP;
2031                 if (vc->vc_charset == 1)
2032                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2033                 vc->vc_state = ESnormal;
2034                 return;
2035         default:
2036                 vc->vc_state = ESnormal;
2037         }
2038 }
2039
2040 /* This is a temporary buffer used to prepare a tty console write
2041  * so that we can easily avoid touching user space while holding the
2042  * console spinlock.  It is allocated in con_init and is shared by
2043  * this code and the vc_screen read/write tty calls.
2044  *
2045  * We have to allocate this statically in the kernel data section
2046  * since console_init (and thus con_init) are called before any
2047  * kernel memory allocation is available.
2048  */
2049 char con_buf[CON_BUF_SIZE];
2050 DEFINE_MUTEX(con_buf_mtx);
2051
2052 /* is_double_width() is based on the wcwidth() implementation by
2053  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2054  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2055  */
2056 struct interval {
2057         uint32_t first;
2058         uint32_t last;
2059 };
2060
2061 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2062 {
2063         int min = 0;
2064         int mid;
2065
2066         if (ucs < table[0].first || ucs > table[max].last)
2067                 return 0;
2068         while (max >= min) {
2069                 mid = (min + max) / 2;
2070                 if (ucs > table[mid].last)
2071                         min = mid + 1;
2072                 else if (ucs < table[mid].first)
2073                         max = mid - 1;
2074                 else
2075                         return 1;
2076         }
2077         return 0;
2078 }
2079
2080 static int is_double_width(uint32_t ucs)
2081 {
2082         static const struct interval double_width[] = {
2083                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2084                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2085                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2086                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2087         };
2088         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2089 }
2090
2091 /* acquires console_sem */
2092 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2093 {
2094 #ifdef VT_BUF_VRAM_ONLY
2095 #define FLUSH do { } while(0);
2096 #else
2097 #define FLUSH if (draw_x >= 0) { \
2098         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2099         draw_x = -1; \
2100         }
2101 #endif
2102
2103         int c, tc, ok, n = 0, draw_x = -1;
2104         unsigned int currcons;
2105         unsigned long draw_from = 0, draw_to = 0;
2106         struct vc_data *vc;
2107         unsigned char vc_attr;
2108         struct vt_notifier_param param;
2109         uint8_t rescan;
2110         uint8_t inverse;
2111         uint8_t width;
2112         u16 himask, charmask;
2113         const unsigned char *orig_buf = NULL;
2114         int orig_count;
2115
2116         if (in_interrupt())
2117                 return count;
2118
2119         might_sleep();
2120
2121         acquire_console_sem();
2122         vc = tty->driver_data;
2123         if (vc == NULL) {
2124                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2125                 release_console_sem();
2126                 return 0;
2127         }
2128
2129         currcons = vc->vc_num;
2130         if (!vc_cons_allocated(currcons)) {
2131             /* could this happen? */
2132                 printk_once("con_write: tty %d not allocated\n", currcons+1);
2133             release_console_sem();
2134             return 0;
2135         }
2136         orig_buf = buf;
2137         orig_count = count;
2138
2139         himask = vc->vc_hi_font_mask;
2140         charmask = himask ? 0x1ff : 0xff;
2141
2142         /* undraw cursor first */
2143         if (IS_FG(vc))
2144                 hide_cursor(vc);
2145
2146         param.vc = vc;
2147
2148         while (!tty->stopped && count) {
2149                 int orig = *buf;
2150                 c = orig;
2151                 buf++;
2152                 n++;
2153                 count--;
2154                 rescan = 0;
2155                 inverse = 0;
2156                 width = 1;
2157
2158                 /* Do no translation at all in control states */
2159                 if (vc->vc_state != ESnormal) {
2160                         tc = c;
2161                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2162                     /* Combine UTF-8 into Unicode in vc_utf_char.
2163                      * vc_utf_count is the number of continuation bytes still
2164                      * expected to arrive.
2165                      * vc_npar is the number of continuation bytes arrived so
2166                      * far
2167                      */
2168 rescan_last_byte:
2169                     if ((c & 0xc0) == 0x80) {
2170                         /* Continuation byte received */
2171                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2172                         if (vc->vc_utf_count) {
2173                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2174                             vc->vc_npar++;
2175                             if (--vc->vc_utf_count) {
2176                                 /* Still need some bytes */
2177                                 continue;
2178                             }
2179                             /* Got a whole character */
2180                             c = vc->vc_utf_char;
2181                             /* Reject overlong sequences */
2182                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2183                                         c > utf8_length_changes[vc->vc_npar])
2184                                 c = 0xfffd;
2185                         } else {
2186                             /* Unexpected continuation byte */
2187                             vc->vc_utf_count = 0;
2188                             c = 0xfffd;
2189                         }
2190                     } else {
2191                         /* Single ASCII byte or first byte of a sequence received */
2192                         if (vc->vc_utf_count) {
2193                             /* Continuation byte expected */
2194                             rescan = 1;
2195                             vc->vc_utf_count = 0;
2196                             c = 0xfffd;
2197                         } else if (c > 0x7f) {
2198                             /* First byte of a multibyte sequence received */
2199                             vc->vc_npar = 0;
2200                             if ((c & 0xe0) == 0xc0) {
2201                                 vc->vc_utf_count = 1;
2202                                 vc->vc_utf_char = (c & 0x1f);
2203                             } else if ((c & 0xf0) == 0xe0) {
2204                                 vc->vc_utf_count = 2;
2205                                 vc->vc_utf_char = (c & 0x0f);
2206                             } else if ((c & 0xf8) == 0xf0) {
2207                                 vc->vc_utf_count = 3;
2208                                 vc->vc_utf_char = (c & 0x07);
2209                             } else if ((c & 0xfc) == 0xf8) {
2210                                 vc->vc_utf_count = 4;
2211                                 vc->vc_utf_char = (c & 0x03);
2212                             } else if ((c & 0xfe) == 0xfc) {
2213                                 vc->vc_utf_count = 5;
2214                                 vc->vc_utf_char = (c & 0x01);
2215                             } else {
2216                                 /* 254 and 255 are invalid */
2217                                 c = 0xfffd;
2218                             }
2219                             if (vc->vc_utf_count) {
2220                                 /* Still need some bytes */
2221                                 continue;
2222                             }
2223                         }
2224                         /* Nothing to do if an ASCII byte was received */
2225                     }
2226                     /* End of UTF-8 decoding. */
2227                     /* c is the received character, or U+FFFD for invalid sequences. */
2228                     /* Replace invalid Unicode code points with U+FFFD too */
2229                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2230                         c = 0xfffd;
2231                     tc = c;
2232                 } else {        /* no utf or alternate charset mode */
2233                     tc = vc_translate(vc, c);
2234                 }
2235
2236                 param.c = tc;
2237                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2238                                         &param) == NOTIFY_STOP)
2239                         continue;
2240
2241                 /* If the original code was a control character we
2242                  * only allow a glyph to be displayed if the code is
2243                  * not normally used (such as for cursor movement) or
2244                  * if the disp_ctrl mode has been explicitly enabled.
2245                  * Certain characters (as given by the CTRL_ALWAYS
2246                  * bitmap) are always displayed as control characters,
2247                  * as the console would be pretty useless without
2248                  * them; to display an arbitrary font position use the
2249                  * direct-to-font zone in UTF-8 mode.
2250                  */
2251                 ok = tc && (c >= 32 ||
2252                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2253                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2254                         && (c != 127 || vc->vc_disp_ctrl)
2255                         && (c != 128+27);
2256
2257                 if (vc->vc_state == ESnormal && ok) {
2258                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2259                                 if (is_double_width(c))
2260                                         width = 2;
2261                         }
2262                         /* Now try to find out how to display it */
2263                         tc = conv_uni_to_pc(vc, tc);
2264                         if (tc & ~charmask) {
2265                                 if (tc == -1 || tc == -2) {
2266                                     continue; /* nothing to display */
2267                                 }
2268                                 /* Glyph not found */
2269                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2270                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2271                                        This would make absolutely no sense with Unicode in mind,
2272                                        but do this for ASCII characters since a font may lack
2273                                        Unicode mapping info and we don't want to end up with
2274                                        having question marks only. */
2275                                     tc = c;
2276                                 } else {
2277                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2278                                     tc = conv_uni_to_pc(vc, 0xfffd);
2279                                     if (tc < 0) {
2280                                         inverse = 1;
2281                                         tc = conv_uni_to_pc(vc, '?');
2282                                         if (tc < 0) tc = '?';
2283                                     }
2284                                 }
2285                         }
2286
2287                         if (!inverse) {
2288                                 vc_attr = vc->vc_attr;
2289                         } else {
2290                                 /* invert vc_attr */
2291                                 if (!vc->vc_can_do_color) {
2292                                         vc_attr = (vc->vc_attr) ^ 0x08;
2293                                 } else if (vc->vc_hi_font_mask == 0x100) {
2294                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2295                                 } else {
2296                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2297                                 }
2298                                 FLUSH
2299                         }
2300
2301                         while (1) {
2302                                 if (vc->vc_need_wrap || vc->vc_decim)
2303                                         FLUSH
2304                                 if (vc->vc_need_wrap) {
2305                                         cr(vc);
2306                                         lf(vc);
2307                                 }
2308                                 if (vc->vc_decim)
2309                                         insert_char(vc, 1);
2310                                 scr_writew(himask ?
2311                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2312                                              (vc_attr << 8) + tc,
2313                                            (u16 *) vc->vc_pos);
2314                                 if (DO_UPDATE(vc) && draw_x < 0) {
2315                                         draw_x = vc->vc_x;
2316                                         draw_from = vc->vc_pos;
2317                                 }
2318                                 if (vc->vc_x == vc->vc_cols - 1) {
2319                                         vc->vc_need_wrap = vc->vc_decawm;
2320                                         draw_to = vc->vc_pos + 2;
2321                                 } else {
2322                                         vc->vc_x++;
2323                                         draw_to = (vc->vc_pos += 2);
2324                                 }
2325
2326                                 if (!--width) break;
2327
2328                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2329                                 if (tc < 0) tc = ' ';
2330                         }
2331                         notify_write(vc, c);
2332
2333                         if (inverse) {
2334                                 FLUSH
2335                         }
2336
2337                         if (rescan) {
2338                                 rescan = 0;
2339                                 inverse = 0;
2340                                 width = 1;
2341                                 c = orig;
2342                                 goto rescan_last_byte;
2343                         }
2344                         continue;
2345                 }
2346                 FLUSH
2347                 do_con_trol(tty, vc, orig);
2348         }
2349         FLUSH
2350         console_conditional_schedule();
2351         release_console_sem();
2352         notify_update(vc);
2353         return n;
2354 #undef FLUSH
2355 }
2356
2357 /*
2358  * This is the console switching callback.
2359  *
2360  * Doing console switching in a process context allows
2361  * us to do the switches asynchronously (needed when we want
2362  * to switch due to a keyboard interrupt).  Synchronization
2363  * with other console code and prevention of re-entrancy is
2364  * ensured with console_sem.
2365  */
2366 static void console_callback(struct work_struct *ignored)
2367 {
2368         acquire_console_sem();
2369
2370         if (want_console >= 0) {
2371                 if (want_console != fg_console &&
2372                     vc_cons_allocated(want_console)) {
2373                         hide_cursor(vc_cons[fg_console].d);
2374                         change_console(vc_cons[want_console].d);
2375                         /* we only changed when the console had already
2376                            been allocated - a new console is not created
2377                            in an interrupt routine */
2378                 }
2379                 want_console = -1;
2380         }
2381         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2382                 do_poke_blanked_console = 0;
2383                 poke_blanked_console();
2384         }
2385         if (scrollback_delta) {
2386                 struct vc_data *vc = vc_cons[fg_console].d;
2387                 clear_selection();
2388                 if (vc->vc_mode == KD_TEXT)
2389                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2390                 scrollback_delta = 0;
2391         }
2392         if (blank_timer_expired) {
2393                 do_blank_screen(0);
2394                 blank_timer_expired = 0;
2395         }
2396         notify_update(vc_cons[fg_console].d);
2397
2398         release_console_sem();
2399 }
2400
2401 int set_console(int nr)
2402 {
2403         struct vc_data *vc = vc_cons[fg_console].d;
2404
2405         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2406                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2407
2408                 /*
2409                  * Console switch will fail in console_callback() or
2410                  * change_console() so there is no point scheduling
2411                  * the callback
2412                  *
2413                  * Existing set_console() users don't check the return
2414                  * value so this shouldn't break anything
2415                  */
2416                 return -EINVAL;
2417         }
2418
2419         want_console = nr;
2420         schedule_console_callback();
2421
2422         return 0;
2423 }
2424
2425 struct tty_driver *console_driver;
2426
2427 #ifdef CONFIG_VT_CONSOLE
2428
2429 /*
2430  *      Console on virtual terminal
2431  *
2432  * The console must be locked when we get here.
2433  */
2434
2435 static void vt_console_print(struct console *co, const char *b, unsigned count)
2436 {
2437         struct vc_data *vc = vc_cons[fg_console].d;
2438         unsigned char c;
2439         static DEFINE_SPINLOCK(printing_lock);
2440         const ushort *start;
2441         ushort cnt = 0;
2442         ushort myx;
2443
2444         /* console busy or not yet initialized */
2445         if (!printable)
2446                 return;
2447         if (!spin_trylock(&printing_lock))
2448                 return;
2449
2450         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2451                 vc = vc_cons[kmsg_redirect - 1].d;
2452
2453         /* read `x' only after setting currcons properly (otherwise
2454            the `x' macro will read the x of the foreground console). */
2455         myx = vc->vc_x;
2456
2457         if (!vc_cons_allocated(fg_console)) {
2458                 /* impossible */
2459                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2460                 goto quit;
2461         }
2462
2463         if (vc->vc_mode != KD_TEXT)
2464                 goto quit;
2465
2466         /* undraw cursor first */
2467         if (IS_FG(vc))
2468                 hide_cursor(vc);
2469
2470         start = (ushort *)vc->vc_pos;
2471
2472         /* Contrived structure to try to emulate original need_wrap behaviour
2473          * Problems caused when we have need_wrap set on '\n' character */
2474         while (count--) {
2475                 c = *b++;
2476                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2477                         if (cnt > 0) {
2478                                 if (CON_IS_VISIBLE(vc))
2479                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2480                                 vc->vc_x += cnt;
2481                                 if (vc->vc_need_wrap)
2482                                         vc->vc_x--;
2483                                 cnt = 0;
2484                         }
2485                         if (c == 8) {           /* backspace */
2486                                 bs(vc);
2487                                 start = (ushort *)vc->vc_pos;
2488                                 myx = vc->vc_x;
2489                                 continue;
2490                         }
2491                         if (c != 13)
2492                                 lf(vc);
2493                         cr(vc);
2494                         start = (ushort *)vc->vc_pos;
2495                         myx = vc->vc_x;
2496                         if (c == 10 || c == 13)
2497                                 continue;
2498                 }
2499                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2500                 notify_write(vc, c);
2501                 cnt++;
2502                 if (myx == vc->vc_cols - 1) {
2503                         vc->vc_need_wrap = 1;
2504                         continue;
2505                 }
2506                 vc->vc_pos += 2;
2507                 myx++;
2508         }
2509         if (cnt > 0) {
2510                 if (CON_IS_VISIBLE(vc))
2511                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2512                 vc->vc_x += cnt;
2513                 if (vc->vc_x == vc->vc_cols) {
2514                         vc->vc_x--;
2515                         vc->vc_need_wrap = 1;
2516                 }
2517         }
2518         set_cursor(vc);
2519         notify_update(vc);
2520
2521 quit:
2522         spin_unlock(&printing_lock);
2523 }
2524
2525 static struct tty_driver *vt_console_device(struct console *c, int *index)
2526 {
2527         *index = c->index ? c->index-1 : fg_console;
2528         return console_driver;
2529 }
2530
2531 static struct console vt_console_driver = {
2532         .name           = "tty",
2533         .write          = vt_console_print,
2534         .device         = vt_console_device,
2535         .unblank        = unblank_screen,
2536         .flags          = CON_PRINTBUFFER,
2537         .index          = -1,
2538 };
2539 #endif
2540
2541 /*
2542  *      Handling of Linux-specific VC ioctls
2543  */
2544
2545 /*
2546  * Generally a bit racy with respect to console_sem().
2547  *
2548  * There are some functions which don't need it.
2549  *
2550  * There are some functions which can sleep for arbitrary periods
2551  * (paste_selection) but we don't need the lock there anyway.
2552  *
2553  * set_selection has locking, and definitely needs it
2554  */
2555
2556 int tioclinux(struct tty_struct *tty, unsigned long arg)
2557 {
2558         char type, data;
2559         char __user *p = (char __user *)arg;
2560         int lines;
2561         int ret;
2562
2563         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2564                 return -EPERM;
2565         if (get_user(type, p))
2566                 return -EFAULT;
2567         ret = 0;
2568
2569         lock_kernel();
2570
2571         switch (type)
2572         {
2573                 case TIOCL_SETSEL:
2574                         acquire_console_sem();
2575                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2576                         release_console_sem();
2577                         break;
2578                 case TIOCL_PASTESEL:
2579                         ret = paste_selection(tty);
2580                         break;
2581                 case TIOCL_UNBLANKSCREEN:
2582                         acquire_console_sem();
2583                         unblank_screen();
2584                         release_console_sem();
2585                         break;
2586                 case TIOCL_SELLOADLUT:
2587                         ret = sel_loadlut(p);
2588                         break;
2589                 case TIOCL_GETSHIFTSTATE:
2590
2591         /*
2592          * Make it possible to react to Shift+Mousebutton.
2593          * Note that 'shift_state' is an undocumented
2594          * kernel-internal variable; programs not closely
2595          * related to the kernel should not use this.
2596          */
2597                         data = shift_state;
2598                         ret = __put_user(data, p);
2599                         break;
2600                 case TIOCL_GETMOUSEREPORTING:
2601                         data = mouse_reporting();
2602                         ret = __put_user(data, p);
2603                         break;
2604                 case TIOCL_SETVESABLANK:
2605                         ret = set_vesa_blanking(p);
2606                         break;
2607                 case TIOCL_GETKMSGREDIRECT:
2608                         data = kmsg_redirect;
2609                         ret = __put_user(data, p);
2610                         break;
2611                 case TIOCL_SETKMSGREDIRECT:
2612                         if (!capable(CAP_SYS_ADMIN)) {
2613                                 ret = -EPERM;
2614                         } else {
2615                                 if (get_user(data, p+1))
2616                                         ret = -EFAULT;
2617                                 else
2618                                         kmsg_redirect = data;
2619                         }
2620                         break;
2621                 case TIOCL_GETFGCONSOLE:
2622                         ret = fg_console;
2623                         break;
2624                 case TIOCL_SCROLLCONSOLE:
2625                         if (get_user(lines, (s32 __user *)(p+4))) {
2626                                 ret = -EFAULT;
2627                         } else {
2628                                 scrollfront(vc_cons[fg_console].d, lines);
2629                                 ret = 0;
2630                         }
2631                         break;
2632                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2633                         acquire_console_sem();
2634                         ignore_poke = 1;
2635                         do_blank_screen(0);
2636                         release_console_sem();
2637                         break;
2638                 case TIOCL_BLANKEDSCREEN:
2639                         ret = console_blanked;
2640                         break;
2641                 default:
2642                         ret = -EINVAL;
2643                         break;
2644         }
2645         unlock_kernel();
2646         return ret;
2647 }
2648
2649 /*
2650  * /dev/ttyN handling
2651  */
2652
2653 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2654 {
2655         int     retval;
2656
2657         retval = do_con_write(tty, buf, count);
2658         con_flush_chars(tty);
2659
2660         return retval;
2661 }
2662
2663 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2664 {
2665         if (in_interrupt())
2666                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2667         return do_con_write(tty, &ch, 1);
2668 }
2669
2670 static int con_write_room(struct tty_struct *tty)
2671 {
2672         if (tty->stopped)
2673                 return 0;
2674         return 32768;           /* No limit, really; we're not buffering */
2675 }
2676
2677 static int con_chars_in_buffer(struct tty_struct *tty)
2678 {
2679         return 0;               /* we're not buffering */
2680 }
2681
2682 /*
2683  * con_throttle and con_unthrottle are only used for
2684  * paste_selection(), which has to stuff in a large number of
2685  * characters...
2686  */
2687 static void con_throttle(struct tty_struct *tty)
2688 {
2689 }
2690
2691 static void con_unthrottle(struct tty_struct *tty)
2692 {
2693         struct vc_data *vc = tty->driver_data;
2694
2695         wake_up_interruptible(&vc->paste_wait);
2696 }
2697
2698 /*
2699  * Turn the Scroll-Lock LED on when the tty is stopped
2700  */
2701 static void con_stop(struct tty_struct *tty)
2702 {
2703         int console_num;
2704         if (!tty)
2705                 return;
2706         console_num = tty->index;
2707         if (!vc_cons_allocated(console_num))
2708                 return;
2709         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2710         set_leds();
2711 }
2712
2713 /*
2714  * Turn the Scroll-Lock LED off when the console is started
2715  */
2716 static void con_start(struct tty_struct *tty)
2717 {
2718         int console_num;
2719         if (!tty)
2720                 return;
2721         console_num = tty->index;
2722         if (!vc_cons_allocated(console_num))
2723                 return;
2724         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2725         set_leds();
2726 }
2727
2728 static void con_flush_chars(struct tty_struct *tty)
2729 {
2730         struct vc_data *vc;
2731
2732         if (in_interrupt())     /* from flush_to_ldisc */
2733                 return;
2734
2735         /* if we race with con_close(), vt may be null */
2736         acquire_console_sem();
2737         vc = tty->driver_data;
2738         if (vc)
2739                 set_cursor(vc);
2740         release_console_sem();
2741 }
2742
2743 /*
2744  * Allocate the console screen memory.
2745  */
2746 static int con_open(struct tty_struct *tty, struct file *filp)
2747 {
2748         unsigned int currcons = tty->index;
2749         int ret = 0;
2750
2751         acquire_console_sem();
2752         if (tty->driver_data == NULL) {
2753                 ret = vc_allocate(currcons);
2754                 if (ret == 0) {
2755                         struct vc_data *vc = vc_cons[currcons].d;
2756
2757                         /* Still being freed */
2758                         if (vc->vc_tty) {
2759                                 release_console_sem();
2760                                 return -ERESTARTSYS;
2761                         }
2762                         tty->driver_data = vc;
2763                         vc->vc_tty = tty;
2764
2765                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2766                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2767                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2768                         }
2769                         if (vc->vc_utf)
2770                                 tty->termios->c_iflag |= IUTF8;
2771                         else
2772                                 tty->termios->c_iflag &= ~IUTF8;
2773                         release_console_sem();
2774                         return ret;
2775                 }
2776         }
2777         release_console_sem();
2778         return ret;
2779 }
2780
2781 static void con_close(struct tty_struct *tty, struct file *filp)
2782 {
2783         /* Nothing to do - we defer to shutdown */
2784 }
2785
2786 static void con_shutdown(struct tty_struct *tty)
2787 {
2788         struct vc_data *vc = tty->driver_data;
2789         BUG_ON(vc == NULL);
2790         acquire_console_sem();
2791         vc->vc_tty = NULL;
2792         release_console_sem();
2793         tty_shutdown(tty);
2794 }
2795
2796 static int default_italic_color    = 2; // green (ASCII)
2797 static int default_underline_color = 3; // cyan (ASCII)
2798 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2799 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2800
2801 static void vc_init(struct vc_data *vc, unsigned int rows,
2802                     unsigned int cols, int do_clear)
2803 {
2804         int j, k ;
2805
2806         vc->vc_cols = cols;
2807         vc->vc_rows = rows;
2808         vc->vc_size_row = cols << 1;
2809         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2810
2811         set_origin(vc);
2812         vc->vc_pos = vc->vc_origin;
2813         reset_vc(vc);
2814         for (j=k=0; j<16; j++) {
2815                 vc->vc_palette[k++] = default_red[j] ;
2816                 vc->vc_palette[k++] = default_grn[j] ;
2817                 vc->vc_palette[k++] = default_blu[j] ;
2818         }
2819         vc->vc_def_color       = 0x07;   /* white */
2820         vc->vc_ulcolor         = default_underline_color;
2821         vc->vc_itcolor         = default_italic_color;
2822         vc->vc_halfcolor       = 0x08;   /* grey */
2823         init_waitqueue_head(&vc->paste_wait);
2824         reset_terminal(vc, do_clear);
2825 }
2826
2827 /*
2828  * This routine initializes console interrupts, and does nothing
2829  * else. If you want the screen to clear, call tty_write with
2830  * the appropriate escape-sequence.
2831  */
2832
2833 static int __init con_init(void)
2834 {
2835         const char *display_desc = NULL;
2836         struct vc_data *vc;
2837         unsigned int currcons = 0, i;
2838
2839         acquire_console_sem();
2840
2841         if (conswitchp)
2842                 display_desc = conswitchp->con_startup();
2843         if (!display_desc) {
2844                 fg_console = 0;
2845                 release_console_sem();
2846                 return 0;
2847         }
2848
2849         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2850                 struct con_driver *con_driver = &registered_con_driver[i];
2851
2852                 if (con_driver->con == NULL) {
2853                         con_driver->con = conswitchp;
2854                         con_driver->desc = display_desc;
2855                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2856                         con_driver->first = 0;
2857                         con_driver->last = MAX_NR_CONSOLES - 1;
2858                         break;
2859                 }
2860         }
2861
2862         for (i = 0; i < MAX_NR_CONSOLES; i++)
2863                 con_driver_map[i] = conswitchp;
2864
2865         if (blankinterval) {
2866                 blank_state = blank_normal_wait;
2867                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2868         }
2869
2870         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2871                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2872                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2873                 visual_init(vc, currcons, 1);
2874                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2875                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2876                         currcons || !vc->vc_sw->con_save_screen);
2877         }
2878         currcons = fg_console = 0;
2879         master_display_fg = vc = vc_cons[currcons].d;
2880         set_origin(vc);
2881         save_screen(vc);
2882         gotoxy(vc, vc->vc_x, vc->vc_y);
2883         csi_J(vc, 0);
2884         update_screen(vc);
2885         printk("Console: %s %s %dx%d",
2886                 vc->vc_can_do_color ? "colour" : "mono",
2887                 display_desc, vc->vc_cols, vc->vc_rows);
2888         printable = 1;
2889         printk("\n");
2890
2891         release_console_sem();
2892
2893 #ifdef CONFIG_VT_CONSOLE
2894         register_console(&vt_console_driver);
2895 #endif
2896         return 0;
2897 }
2898 console_initcall(con_init);
2899
2900 static const struct tty_operations con_ops = {
2901         .open = con_open,
2902         .close = con_close,
2903         .write = con_write,
2904         .write_room = con_write_room,
2905         .put_char = con_put_char,
2906         .flush_chars = con_flush_chars,
2907         .chars_in_buffer = con_chars_in_buffer,
2908         .ioctl = vt_ioctl,
2909 #ifdef CONFIG_COMPAT
2910         .compat_ioctl = vt_compat_ioctl,
2911 #endif
2912         .stop = con_stop,
2913         .start = con_start,
2914         .throttle = con_throttle,
2915         .unthrottle = con_unthrottle,
2916         .resize = vt_resize,
2917         .shutdown = con_shutdown
2918 };
2919
2920 static struct cdev vc0_cdev;
2921
2922 int __init vty_init(const struct file_operations *console_fops)
2923 {
2924         cdev_init(&vc0_cdev, console_fops);
2925         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2926             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2927                 panic("Couldn't register /dev/tty0 driver\n");
2928         device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2929
2930         vcs_init();
2931
2932         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2933         if (!console_driver)
2934                 panic("Couldn't allocate console driver\n");
2935         console_driver->owner = THIS_MODULE;
2936         console_driver->name = "tty";
2937         console_driver->name_base = 1;
2938         console_driver->major = TTY_MAJOR;
2939         console_driver->minor_start = 1;
2940         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2941         console_driver->init_termios = tty_std_termios;
2942         if (default_utf8)
2943                 console_driver->init_termios.c_iflag |= IUTF8;
2944         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2945         tty_set_operations(console_driver, &con_ops);
2946         if (tty_register_driver(console_driver))
2947                 panic("Couldn't register console driver\n");
2948         kbd_init();
2949         console_map_init();
2950 #ifdef CONFIG_MDA_CONSOLE
2951         mda_console_init();
2952 #endif
2953         return 0;
2954 }
2955
2956 #ifndef VT_SINGLE_DRIVER
2957
2958 static struct class *vtconsole_class;
2959
2960 static int bind_con_driver(const struct consw *csw, int first, int last,
2961                            int deflt)
2962 {
2963         struct module *owner = csw->owner;
2964         const char *desc = NULL;
2965         struct con_driver *con_driver;
2966         int i, j = -1, k = -1, retval = -ENODEV;
2967
2968         if (!try_module_get(owner))
2969                 return -ENODEV;
2970
2971         acquire_console_sem();
2972
2973         /* check if driver is registered */
2974         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2975                 con_driver = &registered_con_driver[i];
2976
2977                 if (con_driver->con == csw) {
2978                         desc = con_driver->desc;
2979                         retval = 0;
2980                         break;
2981                 }
2982         }
2983
2984         if (retval)
2985                 goto err;
2986
2987         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2988                 csw->con_startup();
2989                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2990         }
2991
2992         if (deflt) {
2993                 if (conswitchp)
2994                         module_put(conswitchp->owner);
2995
2996                 __module_get(owner);
2997                 conswitchp = csw;
2998         }
2999
3000         first = max(first, con_driver->first);
3001         last = min(last, con_driver->last);
3002
3003         for (i = first; i <= last; i++) {
3004                 int old_was_color;
3005                 struct vc_data *vc = vc_cons[i].d;
3006
3007                 if (con_driver_map[i])
3008                         module_put(con_driver_map[i]->owner);
3009                 __module_get(owner);
3010                 con_driver_map[i] = csw;
3011
3012                 if (!vc || !vc->vc_sw)
3013                         continue;
3014
3015                 j = i;
3016
3017                 if (CON_IS_VISIBLE(vc)) {
3018                         k = i;
3019                         save_screen(vc);
3020                 }
3021
3022                 old_was_color = vc->vc_can_do_color;
3023                 vc->vc_sw->con_deinit(vc);
3024                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3025                 visual_init(vc, i, 0);
3026                 set_origin(vc);
3027                 update_attr(vc);
3028
3029                 /* If the console changed between mono <-> color, then
3030                  * the attributes in the screenbuf will be wrong.  The
3031                  * following resets all attributes to something sane.
3032                  */
3033                 if (old_was_color != vc->vc_can_do_color)
3034                         clear_buffer_attributes(vc);
3035         }
3036
3037         printk("Console: switching ");
3038         if (!deflt)
3039                 printk("consoles %d-%d ", first+1, last+1);
3040         if (j >= 0) {
3041                 struct vc_data *vc = vc_cons[j].d;
3042
3043                 printk("to %s %s %dx%d\n",
3044                        vc->vc_can_do_color ? "colour" : "mono",
3045                        desc, vc->vc_cols, vc->vc_rows);
3046
3047                 if (k >= 0) {
3048                         vc = vc_cons[k].d;
3049                         update_screen(vc);
3050                 }
3051         } else
3052                 printk("to %s\n", desc);
3053
3054         retval = 0;
3055 err:
3056         release_console_sem();
3057         module_put(owner);
3058         return retval;
3059 };
3060
3061 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3062 static int con_is_graphics(const struct consw *csw, int first, int last)
3063 {
3064         int i, retval = 0;
3065
3066         for (i = first; i <= last; i++) {
3067                 struct vc_data *vc = vc_cons[i].d;
3068
3069                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3070                         retval = 1;
3071                         break;
3072                 }
3073         }
3074
3075         return retval;
3076 }
3077
3078 /**
3079  * unbind_con_driver - unbind a console driver
3080  * @csw: pointer to console driver to unregister
3081  * @first: first in range of consoles that @csw should be unbound from
3082  * @last: last in range of consoles that @csw should be unbound from
3083  * @deflt: should next bound console driver be default after @csw is unbound?
3084  *
3085  * To unbind a driver from all possible consoles, pass 0 as @first and
3086  * %MAX_NR_CONSOLES as @last.
3087  *
3088  * @deflt controls whether the console that ends up replacing @csw should be
3089  * the default console.
3090  *
3091  * RETURNS:
3092  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3093  * or 0 on success.
3094  */
3095 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3096 {
3097         struct module *owner = csw->owner;
3098         const struct consw *defcsw = NULL;
3099         struct con_driver *con_driver = NULL, *con_back = NULL;
3100         int i, retval = -ENODEV;
3101
3102         if (!try_module_get(owner))
3103                 return -ENODEV;
3104
3105         acquire_console_sem();
3106
3107         /* check if driver is registered and if it is unbindable */
3108         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3109                 con_driver = &registered_con_driver[i];
3110
3111                 if (con_driver->con == csw &&
3112                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3113                         retval = 0;
3114                         break;
3115                 }
3116         }
3117
3118         if (retval) {
3119                 release_console_sem();
3120                 goto err;
3121         }
3122
3123         retval = -ENODEV;
3124
3125         /* check if backup driver exists */
3126         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3127                 con_back = &registered_con_driver[i];
3128
3129                 if (con_back->con &&
3130                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3131                         defcsw = con_back->con;
3132                         retval = 0;
3133                         break;
3134                 }
3135         }
3136
3137         if (retval) {
3138                 release_console_sem();
3139                 goto err;
3140         }
3141
3142         if (!con_is_bound(csw)) {
3143                 release_console_sem();
3144                 goto err;
3145         }
3146
3147         first = max(first, con_driver->first);
3148         last = min(last, con_driver->last);
3149
3150         for (i = first; i <= last; i++) {
3151                 if (con_driver_map[i] == csw) {
3152                         module_put(csw->owner);
3153                         con_driver_map[i] = NULL;
3154                 }
3155         }
3156
3157         if (!con_is_bound(defcsw)) {
3158                 const struct consw *defconsw = conswitchp;
3159
3160                 defcsw->con_startup();
3161                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3162                 /*
3163                  * vgacon may change the default driver to point
3164                  * to dummycon, we restore it here...
3165                  */
3166                 conswitchp = defconsw;
3167         }
3168
3169         if (!con_is_bound(csw))
3170                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3171
3172         release_console_sem();
3173         /* ignore return value, binding should not fail */
3174         bind_con_driver(defcsw, first, last, deflt);
3175 err:
3176         module_put(owner);
3177         return retval;
3178
3179 }
3180 EXPORT_SYMBOL(unbind_con_driver);
3181
3182 static int vt_bind(struct con_driver *con)
3183 {
3184         const struct consw *defcsw = NULL, *csw = NULL;
3185         int i, more = 1, first = -1, last = -1, deflt = 0;
3186
3187         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3188             con_is_graphics(con->con, con->first, con->last))
3189                 goto err;
3190
3191         csw = con->con;
3192
3193         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3194                 struct con_driver *con = &registered_con_driver[i];
3195
3196                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3197                         defcsw = con->con;
3198                         break;
3199                 }
3200         }
3201
3202         if (!defcsw)
3203                 goto err;
3204
3205         while (more) {
3206                 more = 0;
3207
3208                 for (i = con->first; i <= con->last; i++) {
3209                         if (con_driver_map[i] == defcsw) {
3210                                 if (first == -1)
3211                                         first = i;
3212                                 last = i;
3213                                 more = 1;
3214                         } else if (first != -1)
3215                                 break;
3216                 }
3217
3218                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3219                         deflt = 1;
3220
3221                 if (first != -1)
3222                         bind_con_driver(csw, first, last, deflt);
3223
3224                 first = -1;
3225                 last = -1;
3226                 deflt = 0;
3227         }
3228
3229 err:
3230         return 0;
3231 }
3232
3233 static int vt_unbind(struct con_driver *con)
3234 {
3235         const struct consw *csw = NULL;
3236         int i, more = 1, first = -1, last = -1, deflt = 0;
3237
3238         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3239             con_is_graphics(con->con, con->first, con->last))
3240                 goto err;
3241
3242         csw = con->con;
3243
3244         while (more) {
3245                 more = 0;
3246
3247                 for (i = con->first; i <= con->last; i++) {
3248                         if (con_driver_map[i] == csw) {
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                         unbind_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 #else
3272 static inline int vt_bind(struct con_driver *con)
3273 {
3274         return 0;
3275 }
3276 static inline int vt_unbind(struct con_driver *con)
3277 {
3278         return 0;
3279 }
3280 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3281
3282 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3283                           const char *buf, size_t count)
3284 {
3285         struct con_driver *con = dev_get_drvdata(dev);
3286         int bind = simple_strtoul(buf, NULL, 0);
3287
3288         if (bind)
3289                 vt_bind(con);
3290         else
3291                 vt_unbind(con);
3292
3293         return count;
3294 }
3295
3296 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3297                          char *buf)
3298 {
3299         struct con_driver *con = dev_get_drvdata(dev);
3300         int bind = con_is_bound(con->con);
3301
3302         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3303 }
3304
3305 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3306                          char *buf)
3307 {
3308         struct con_driver *con = dev_get_drvdata(dev);
3309
3310         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3311                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3312                          con->desc);
3313
3314 }
3315
3316 static struct device_attribute device_attrs[] = {
3317         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3318         __ATTR(name, S_IRUGO, show_name, NULL),
3319 };
3320
3321 static int vtconsole_init_device(struct con_driver *con)
3322 {
3323         int i;
3324         int error = 0;
3325
3326         con->flag |= CON_DRIVER_FLAG_ATTR;
3327         dev_set_drvdata(con->dev, con);
3328         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3329                 error = device_create_file(con->dev, &device_attrs[i]);
3330                 if (error)
3331                         break;
3332         }
3333
3334         if (error) {
3335                 while (--i >= 0)
3336                         device_remove_file(con->dev, &device_attrs[i]);
3337                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3338         }
3339
3340         return error;
3341 }
3342
3343 static void vtconsole_deinit_device(struct con_driver *con)
3344 {
3345         int i;
3346
3347         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3348                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3349                         device_remove_file(con->dev, &device_attrs[i]);
3350                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3351         }
3352 }
3353
3354 /**
3355  * con_is_bound - checks if driver is bound to the console
3356  * @csw: console driver
3357  *
3358  * RETURNS: zero if unbound, nonzero if bound
3359  *
3360  * Drivers can call this and if zero, they should release
3361  * all resources allocated on con_startup()
3362  */
3363 int con_is_bound(const struct consw *csw)
3364 {
3365         int i, bound = 0;
3366
3367         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3368                 if (con_driver_map[i] == csw) {
3369                         bound = 1;
3370                         break;
3371                 }
3372         }
3373
3374         return bound;
3375 }
3376 EXPORT_SYMBOL(con_is_bound);
3377
3378 /**
3379  * register_con_driver - register console driver to console layer
3380  * @csw: console driver
3381  * @first: the first console to take over, minimum value is 0
3382  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3383  *
3384  * DESCRIPTION: This function registers a console driver which can later
3385  * bind to a range of consoles specified by @first and @last. It will
3386  * also initialize the console driver by calling con_startup().
3387  */
3388 int register_con_driver(const struct consw *csw, int first, int last)
3389 {
3390         struct module *owner = csw->owner;
3391         struct con_driver *con_driver;
3392         const char *desc;
3393         int i, retval = 0;
3394
3395         if (!try_module_get(owner))
3396                 return -ENODEV;
3397
3398         acquire_console_sem();
3399
3400         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3401                 con_driver = &registered_con_driver[i];
3402
3403                 /* already registered */
3404                 if (con_driver->con == csw)
3405                         retval = -EINVAL;
3406         }
3407
3408         if (retval)
3409                 goto err;
3410
3411         desc = csw->con_startup();
3412
3413         if (!desc)
3414                 goto err;
3415
3416         retval = -EINVAL;
3417
3418         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3419                 con_driver = &registered_con_driver[i];
3420
3421                 if (con_driver->con == NULL) {
3422                         con_driver->con = csw;
3423                         con_driver->desc = desc;
3424                         con_driver->node = i;
3425                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3426                                            CON_DRIVER_FLAG_INIT;
3427                         con_driver->first = first;
3428                         con_driver->last = last;
3429                         retval = 0;
3430                         break;
3431                 }
3432         }
3433
3434         if (retval)
3435                 goto err;
3436
3437         con_driver->dev = device_create(vtconsole_class, NULL,
3438                                                 MKDEV(0, con_driver->node),
3439                                                 NULL, "vtcon%i",
3440                                                 con_driver->node);
3441
3442         if (IS_ERR(con_driver->dev)) {
3443                 printk(KERN_WARNING "Unable to create device for %s; "
3444                        "errno = %ld\n", con_driver->desc,
3445                        PTR_ERR(con_driver->dev));
3446                 con_driver->dev = NULL;
3447         } else {
3448                 vtconsole_init_device(con_driver);
3449         }
3450
3451 err:
3452         release_console_sem();
3453         module_put(owner);
3454         return retval;
3455 }
3456 EXPORT_SYMBOL(register_con_driver);
3457
3458 /**
3459  * unregister_con_driver - unregister console driver from console layer
3460  * @csw: console driver
3461  *
3462  * DESCRIPTION: All drivers that registers to the console layer must
3463  * call this function upon exit, or if the console driver is in a state
3464  * where it won't be able to handle console services, such as the
3465  * framebuffer console without loaded framebuffer drivers.
3466  *
3467  * The driver must unbind first prior to unregistration.
3468  */
3469 int unregister_con_driver(const struct consw *csw)
3470 {
3471         int i, retval = -ENODEV;
3472
3473         acquire_console_sem();
3474
3475         /* cannot unregister a bound driver */
3476         if (con_is_bound(csw))
3477                 goto err;
3478
3479         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3480                 struct con_driver *con_driver = &registered_con_driver[i];
3481
3482                 if (con_driver->con == csw &&
3483                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3484                         vtconsole_deinit_device(con_driver);
3485                         device_destroy(vtconsole_class,
3486                                        MKDEV(0, con_driver->node));
3487                         con_driver->con = NULL;
3488                         con_driver->desc = NULL;
3489                         con_driver->dev = NULL;
3490                         con_driver->node = 0;
3491                         con_driver->flag = 0;
3492                         con_driver->first = 0;
3493                         con_driver->last = 0;
3494                         retval = 0;
3495                         break;
3496                 }
3497         }
3498 err:
3499         release_console_sem();
3500         return retval;
3501 }
3502 EXPORT_SYMBOL(unregister_con_driver);
3503
3504 /*
3505  *      If we support more console drivers, this function is used
3506  *      when a driver wants to take over some existing consoles
3507  *      and become default driver for newly opened ones.
3508  *
3509  *      take_over_console is basically a register followed by unbind
3510  */
3511 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3512 {
3513         int err;
3514
3515         err = register_con_driver(csw, first, last);
3516
3517         if (!err)
3518                 bind_con_driver(csw, first, last, deflt);
3519
3520         return err;
3521 }
3522
3523 /*
3524  * give_up_console is a wrapper to unregister_con_driver. It will only
3525  * work if driver is fully unbound.
3526  */
3527 void give_up_console(const struct consw *csw)
3528 {
3529         unregister_con_driver(csw);
3530 }
3531
3532 static int __init vtconsole_class_init(void)
3533 {
3534         int i;
3535
3536         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3537         if (IS_ERR(vtconsole_class)) {
3538                 printk(KERN_WARNING "Unable to create vt console class; "
3539                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3540                 vtconsole_class = NULL;
3541         }
3542
3543         /* Add system drivers to sysfs */
3544         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3545                 struct con_driver *con = &registered_con_driver[i];
3546
3547                 if (con->con && !con->dev) {
3548                         con->dev = device_create(vtconsole_class, NULL,
3549                                                          MKDEV(0, con->node),
3550                                                          NULL, "vtcon%i",
3551                                                          con->node);
3552
3553                         if (IS_ERR(con->dev)) {
3554                                 printk(KERN_WARNING "Unable to create "
3555                                        "device for %s; errno = %ld\n",
3556                                        con->desc, PTR_ERR(con->dev));
3557                                 con->dev = NULL;
3558                         } else {
3559                                 vtconsole_init_device(con);
3560                         }
3561                 }
3562         }
3563
3564         return 0;
3565 }
3566 postcore_initcall(vtconsole_class_init);
3567
3568 #endif
3569
3570 /*
3571  *      Screen blanking
3572  */
3573
3574 static int set_vesa_blanking(char __user *p)
3575 {
3576         unsigned int mode;
3577
3578         if (get_user(mode, p + 1))
3579                 return -EFAULT;
3580
3581         vesa_blank_mode = (mode < 4) ? mode : 0;
3582         return 0;
3583 }
3584
3585 void do_blank_screen(int entering_gfx)
3586 {
3587         struct vc_data *vc = vc_cons[fg_console].d;
3588         int i;
3589
3590         WARN_CONSOLE_UNLOCKED();
3591
3592         if (console_blanked) {
3593                 if (blank_state == blank_vesa_wait) {
3594                         blank_state = blank_off;
3595                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3596                 }
3597                 return;
3598         }
3599
3600         /* entering graphics mode? */
3601         if (entering_gfx) {
3602                 hide_cursor(vc);
3603                 save_screen(vc);
3604                 vc->vc_sw->con_blank(vc, -1, 1);
3605                 console_blanked = fg_console + 1;
3606                 blank_state = blank_off;
3607                 set_origin(vc);
3608                 return;
3609         }
3610
3611         if (blank_state != blank_normal_wait)
3612                 return;
3613         blank_state = blank_off;
3614
3615         /* don't blank graphics */
3616         if (vc->vc_mode != KD_TEXT) {
3617                 console_blanked = fg_console + 1;
3618                 return;
3619         }
3620
3621         hide_cursor(vc);
3622         del_timer_sync(&console_timer);
3623         blank_timer_expired = 0;
3624
3625         save_screen(vc);
3626         /* In case we need to reset origin, blanking hook returns 1 */
3627         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3628         console_blanked = fg_console + 1;
3629         if (i)
3630                 set_origin(vc);
3631
3632         if (console_blank_hook && console_blank_hook(1))
3633                 return;
3634
3635         if (vesa_off_interval && vesa_blank_mode) {
3636                 blank_state = blank_vesa_wait;
3637                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3638         }
3639         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3640 }
3641 EXPORT_SYMBOL(do_blank_screen);
3642
3643 /*
3644  * Called by timer as well as from vt_console_driver
3645  */
3646 void do_unblank_screen(int leaving_gfx)
3647 {
3648         struct vc_data *vc;
3649
3650         /* This should now always be called from a "sane" (read: can schedule)
3651          * context for the sake of the low level drivers, except in the special
3652          * case of oops_in_progress
3653          */
3654         if (!oops_in_progress)
3655                 might_sleep();
3656
3657         WARN_CONSOLE_UNLOCKED();
3658
3659         ignore_poke = 0;
3660         if (!console_blanked)
3661                 return;
3662         if (!vc_cons_allocated(fg_console)) {
3663                 /* impossible */
3664                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3665                 return;
3666         }
3667         vc = vc_cons[fg_console].d;
3668         if (vc->vc_mode != KD_TEXT)
3669                 return; /* but leave console_blanked != 0 */
3670
3671         if (blankinterval) {
3672                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3673                 blank_state = blank_normal_wait;
3674         }
3675
3676         console_blanked = 0;
3677         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3678                 /* Low-level driver cannot restore -> do it ourselves */
3679                 update_screen(vc);
3680         if (console_blank_hook)
3681                 console_blank_hook(0);
3682         set_palette(vc);
3683         set_cursor(vc);
3684         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3685 }
3686 EXPORT_SYMBOL(do_unblank_screen);
3687
3688 /*
3689  * This is called by the outside world to cause a forced unblank, mostly for
3690  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3691  * call it with 1 as an argument and so force a mode restore... that may kill
3692  * X or at least garbage the screen but would also make the Oops visible...
3693  */
3694 void unblank_screen(void)
3695 {
3696         do_unblank_screen(0);
3697 }
3698
3699 /*
3700  * We defer the timer blanking to work queue so it can take the console mutex
3701  * (console operations can still happen at irq time, but only from printk which
3702  * has the console mutex. Not perfect yet, but better than no locking
3703  */
3704 static void blank_screen_t(unsigned long dummy)
3705 {
3706         if (unlikely(!keventd_up())) {
3707                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3708                 return;
3709         }
3710         blank_timer_expired = 1;
3711         schedule_work(&console_work);
3712 }
3713
3714 void poke_blanked_console(void)
3715 {
3716         WARN_CONSOLE_UNLOCKED();
3717
3718         /* Add this so we quickly catch whoever might call us in a non
3719          * safe context. Nowadays, unblank_screen() isn't to be called in
3720          * atomic contexts and is allowed to schedule (with the special case
3721          * of oops_in_progress, but that isn't of any concern for this
3722          * function. --BenH.
3723          */
3724         might_sleep();
3725
3726         /* This isn't perfectly race free, but a race here would be mostly harmless,
3727          * at worse, we'll do a spurrious blank and it's unlikely
3728          */
3729         del_timer(&console_timer);
3730         blank_timer_expired = 0;
3731
3732         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3733                 return;
3734         if (console_blanked)
3735                 unblank_screen();
3736         else if (blankinterval) {
3737                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3738                 blank_state = blank_normal_wait;
3739         }
3740 }
3741
3742 /*
3743  *      Palettes
3744  */
3745
3746 static void set_palette(struct vc_data *vc)
3747 {
3748         WARN_CONSOLE_UNLOCKED();
3749
3750         if (vc->vc_mode != KD_GRAPHICS)
3751                 vc->vc_sw->con_set_palette(vc, color_table);
3752 }
3753
3754 static int set_get_cmap(unsigned char __user *arg, int set)
3755 {
3756     int i, j, k;
3757
3758     WARN_CONSOLE_UNLOCKED();
3759
3760     for (i = 0; i < 16; i++)
3761         if (set) {
3762             get_user(default_red[i], arg++);
3763             get_user(default_grn[i], arg++);
3764             get_user(default_blu[i], arg++);
3765         } else {
3766             put_user(default_red[i], arg++);
3767             put_user(default_grn[i], arg++);
3768             put_user(default_blu[i], arg++);
3769         }
3770     if (set) {
3771         for (i = 0; i < MAX_NR_CONSOLES; i++)
3772             if (vc_cons_allocated(i)) {
3773                 for (j = k = 0; j < 16; j++) {
3774                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3775                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3776                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3777                 }
3778                 set_palette(vc_cons[i].d);
3779             }
3780     }
3781     return 0;
3782 }
3783
3784 /*
3785  * Load palette into the DAC registers. arg points to a colour
3786  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3787  */
3788
3789 int con_set_cmap(unsigned char __user *arg)
3790 {
3791         int rc;
3792
3793         acquire_console_sem();
3794         rc = set_get_cmap (arg,1);
3795         release_console_sem();
3796
3797         return rc;
3798 }
3799
3800 int con_get_cmap(unsigned char __user *arg)
3801 {
3802         int rc;
3803
3804         acquire_console_sem();
3805         rc = set_get_cmap (arg,0);
3806         release_console_sem();
3807
3808         return rc;
3809 }
3810
3811 void reset_palette(struct vc_data *vc)
3812 {
3813         int j, k;
3814         for (j=k=0; j<16; j++) {
3815                 vc->vc_palette[k++] = default_red[j];
3816                 vc->vc_palette[k++] = default_grn[j];
3817                 vc->vc_palette[k++] = default_blu[j];
3818         }
3819         set_palette(vc);
3820 }
3821
3822 /*
3823  *  Font switching
3824  *
3825  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3826  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3827  *  depending on width) reserved for each character which is kinda wasty, but
3828  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3829  *  is upto the actual low-level console-driver convert data into its favorite
3830  *  format (maybe we should add a `fontoffset' field to the `display'
3831  *  structure so we won't have to convert the fontdata all the time.
3832  *  /Jes
3833  */
3834
3835 #define max_font_size 65536
3836
3837 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3838 {
3839         struct console_font font;
3840         int rc = -EINVAL;
3841         int c;
3842
3843         if (vc->vc_mode != KD_TEXT)
3844                 return -EINVAL;
3845
3846         if (op->data) {
3847                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3848                 if (!font.data)
3849                         return -ENOMEM;
3850         } else
3851                 font.data = NULL;
3852
3853         acquire_console_sem();
3854         if (vc->vc_sw->con_font_get)
3855                 rc = vc->vc_sw->con_font_get(vc, &font);
3856         else
3857                 rc = -ENOSYS;
3858         release_console_sem();
3859
3860         if (rc)
3861                 goto out;
3862
3863         c = (font.width+7)/8 * 32 * font.charcount;
3864
3865         if (op->data && font.charcount > op->charcount)
3866                 rc = -ENOSPC;
3867         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3868                 if (font.width > op->width || font.height > op->height)
3869                         rc = -ENOSPC;
3870         } else {
3871                 if (font.width != 8)
3872                         rc = -EIO;
3873                 else if ((op->height && font.height > op->height) ||
3874                          font.height > 32)
3875                         rc = -ENOSPC;
3876         }
3877         if (rc)
3878                 goto out;
3879
3880         op->height = font.height;
3881         op->width = font.width;
3882         op->charcount = font.charcount;
3883
3884         if (op->data && copy_to_user(op->data, font.data, c))
3885                 rc = -EFAULT;
3886
3887 out:
3888         kfree(font.data);
3889         return rc;
3890 }
3891
3892 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3893 {
3894         struct console_font font;
3895         int rc = -EINVAL;
3896         int size;
3897
3898         if (vc->vc_mode != KD_TEXT)
3899                 return -EINVAL;
3900         if (!op->data)
3901                 return -EINVAL;
3902         if (op->charcount > 512)
3903                 return -EINVAL;
3904         if (!op->height) {              /* Need to guess font height [compat] */
3905                 int h, i;
3906                 u8 __user *charmap = op->data;
3907                 u8 tmp;
3908
3909                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3910                    so that we can get rid of this soon */
3911                 if (!(op->flags & KD_FONT_FLAG_OLD))
3912                         return -EINVAL;
3913                 for (h = 32; h > 0; h--)
3914                         for (i = 0; i < op->charcount; i++) {
3915                                 if (get_user(tmp, &charmap[32*i+h-1]))
3916                                         return -EFAULT;
3917                                 if (tmp)
3918                                         goto nonzero;
3919                         }
3920                 return -EINVAL;
3921         nonzero:
3922                 op->height = h;
3923         }
3924         if (op->width <= 0 || op->width > 32 || op->height > 32)
3925                 return -EINVAL;
3926         size = (op->width+7)/8 * 32 * op->charcount;
3927         if (size > max_font_size)
3928                 return -ENOSPC;
3929         font.charcount = op->charcount;
3930         font.height = op->height;
3931         font.width = op->width;
3932         font.data = kmalloc(size, GFP_KERNEL);
3933         if (!font.data)
3934                 return -ENOMEM;
3935         if (copy_from_user(font.data, op->data, size)) {
3936                 kfree(font.data);
3937                 return -EFAULT;
3938         }
3939         acquire_console_sem();
3940         if (vc->vc_sw->con_font_set)
3941                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3942         else
3943                 rc = -ENOSYS;
3944         release_console_sem();
3945         kfree(font.data);
3946         return rc;
3947 }
3948
3949 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3950 {
3951         struct console_font font = {.width = op->width, .height = op->height};
3952         char name[MAX_FONT_NAME];
3953         char *s = name;
3954         int rc;
3955
3956         if (vc->vc_mode != KD_TEXT)
3957                 return -EINVAL;
3958
3959         if (!op->data)
3960                 s = NULL;
3961         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3962                 return -EFAULT;
3963         else
3964                 name[MAX_FONT_NAME - 1] = 0;
3965
3966         acquire_console_sem();
3967         if (vc->vc_sw->con_font_default)
3968                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3969         else
3970                 rc = -ENOSYS;
3971         release_console_sem();
3972         if (!rc) {
3973                 op->width = font.width;
3974                 op->height = font.height;
3975         }
3976         return rc;
3977 }
3978
3979 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3980 {
3981         int con = op->height;
3982         int rc;
3983
3984         if (vc->vc_mode != KD_TEXT)
3985                 return -EINVAL;
3986
3987         acquire_console_sem();
3988         if (!vc->vc_sw->con_font_copy)
3989                 rc = -ENOSYS;
3990         else if (con < 0 || !vc_cons_allocated(con))
3991                 rc = -ENOTTY;
3992         else if (con == vc->vc_num)     /* nothing to do */
3993                 rc = 0;
3994         else
3995                 rc = vc->vc_sw->con_font_copy(vc, con);
3996         release_console_sem();
3997         return rc;
3998 }
3999
4000 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4001 {
4002         switch (op->op) {
4003         case KD_FONT_OP_SET:
4004                 return con_font_set(vc, op);
4005         case KD_FONT_OP_GET:
4006                 return con_font_get(vc, op);
4007         case KD_FONT_OP_SET_DEFAULT:
4008                 return con_font_default(vc, op);
4009         case KD_FONT_OP_COPY:
4010                 return con_font_copy(vc, op);
4011         }
4012         return -ENOSYS;
4013 }
4014
4015 /*
4016  *      Interface exported to selection and vcs.
4017  */
4018
4019 /* used by selection */
4020 u16 screen_glyph(struct vc_data *vc, int offset)
4021 {
4022         u16 w = scr_readw(screenpos(vc, offset, 1));
4023         u16 c = w & 0xff;
4024
4025         if (w & vc->vc_hi_font_mask)
4026                 c |= 0x100;
4027         return c;
4028 }
4029 EXPORT_SYMBOL_GPL(screen_glyph);
4030
4031 /* used by vcs - note the word offset */
4032 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4033 {
4034         return screenpos(vc, 2 * w_offset, viewed);
4035 }
4036
4037 void getconsxy(struct vc_data *vc, unsigned char *p)
4038 {
4039         p[0] = vc->vc_x;
4040         p[1] = vc->vc_y;
4041 }
4042
4043 void putconsxy(struct vc_data *vc, unsigned char *p)
4044 {
4045         hide_cursor(vc);
4046         gotoxy(vc, p[0], p[1]);
4047         set_cursor(vc);
4048 }
4049
4050 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4051 {
4052         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4053                 return softcursor_original;
4054         return scr_readw(org);
4055 }
4056
4057 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4058 {
4059         scr_writew(val, org);
4060         if ((unsigned long)org == vc->vc_pos) {
4061                 softcursor_original = -1;
4062                 add_softcursor(vc);
4063         }
4064 }
4065
4066 /*
4067  *      Visible symbols for modules
4068  */
4069
4070 EXPORT_SYMBOL(color_table);
4071 EXPORT_SYMBOL(default_red);
4072 EXPORT_SYMBOL(default_grn);
4073 EXPORT_SYMBOL(default_blu);
4074 EXPORT_SYMBOL(update_region);
4075 EXPORT_SYMBOL(redraw_screen);
4076 EXPORT_SYMBOL(vc_resize);
4077 EXPORT_SYMBOL(fg_console);
4078 EXPORT_SYMBOL(console_blank_hook);
4079 EXPORT_SYMBOL(console_blanked);
4080 EXPORT_SYMBOL(vc_cons);
4081 #ifndef VT_SINGLE_DRIVER
4082 EXPORT_SYMBOL(take_over_console);
4083 EXPORT_SYMBOL(give_up_console);
4084 #endif