drivers/char/vt.c

   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton <andrewm@uow.edu.au>
  63  *
  64  * Removed console_lock, enabled interrupts across all console operations
  65  * 13 March 2001, Andrew Morton
  66  *
  67  * Fixed UTF-8 mode so alternate charset modes always work according
  68  * to control sequences interpreted in do_con_trol function
  69  * preserving backward VT100 semigraphics compatibility,
  70  * malformed UTF sequences represented as sequences of replacement glyphs,
  71  * original codes or '?' as a last resort if replacement glyph is undefined
  72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  73  */
  74
  75 #include <linux/module.h>
  76 #include <linux/types.h>
  77 #include <linux/sched.h>
  78 #include <linux/tty.h>
  79 #include <linux/tty_flip.h>
  80 #include <linux/kernel.h>
  81 #include <linux/string.h>
  82 #include <linux/errno.h>
  83 #include <linux/kd.h>
  84 #include <linux/slab.h>
  85 #include <linux/major.h>
  86 #include <linux/mm.h>
  87 #include <linux/console.h>
  88 #include <linux/init.h>
  89 #include <linux/mutex.h>
  90 #include <linux/vt_kern.h>
  91 #include <linux/selection.h>
  92 #include <linux/tiocl.h>
  93 #include <linux/kbd_kern.h>
  94 #include <linux/consolemap.h>
  95 #include <linux/timer.h>
  96 #include <linux/interrupt.h>
  97 #include <linux/workqueue.h>
  98 #include <linux/bootmem.h>
  99 #include <linux/pm.h>
 100 #include <linux/font.h>
 101 #include <linux/bitops.h>
 102 #include <linux/notifier.h>
 103
 104 #include <asm/io.h>
 105 #include <asm/system.h>
 106 #include <asm/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 blankinterval = 10*60*HZ;
 176 static int vesa_off_interval;
 177
 178 static DECLARE_WORK(console_work, console_callback);
 179
 180 /*
 181  * fg_console is the current virtual console,
 182  * last_console is the last used one,
 183  * want_console is the console we want to switch to,
 184  * kmsg_redirect is the console for kernel messages,
 185  */
 186 int fg_console;
 187 int last_console;
 188 int want_console = -1;
 189 int kmsg_redirect;
 190
 191 /*
 192  * For each existing display, we have a pointer to console currently visible
 193  * on that display, allowing consoles other than fg_console to be refreshed
 194  * appropriately. Unless the low-level driver supplies its own display_fg
 195  * variable, we use this one for the "master display".
 196  */
 197 static struct vc_data *master_display_fg;
 198
 199 /*
 200  * Unfortunately, we need to delay tty echo when we're currently writing to the
 201  * console since the code is (and always was) not re-entrant, so we schedule
 202  * all flip requests to process context with schedule-task() and run it from
 203  * console_callback().
 204  */
 205
 206 /*
 207  * For the same reason, we defer scrollback to the console callback.
 208  */
 209 static int scrollback_delta;
 210
 211 /*
 212  * Hook so that the power management routines can (un)blank
 213  * the console on our behalf.
 214  */
 215 int (*console_blank_hook)(int);
 216
 217 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 218 static int blank_state;
 219 static int blank_timer_expired;
 220 enum {
 221         blank_off = 0,
 222         blank_normal_wait,
 223         blank_vesa_wait,
 224 };
 225
 226 /*
 227  * Notifier list for console events.
 228  */
 229 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 230
 231 int register_vt_notifier(struct notifier_block *nb)
 232 {
 233         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 234 }
 235 EXPORT_SYMBOL_GPL(register_vt_notifier);
 236
 237 int unregister_vt_notifier(struct notifier_block *nb)
 238 {
 239         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 240 }
 241 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 242
 243 static void notify_write(struct vc_data *vc, unsigned int unicode)
 244 {
 245         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 246         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 247 }
 248
 249 static void notify_update(struct vc_data *vc)
 250 {
 251         struct vt_notifier_param param = { .vc = vc };
 252         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 253 }
 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             if (!vc->vc_kmalloced)
 773                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 774             if (!vc->vc_screenbuf) {
 775                 kfree(vc);
 776                 vc_cons[currcons].d = NULL;
 777                 return -ENOMEM;
 778             }
 779             vc->vc_kmalloced = 1;
 780             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 781             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 782         }
 783         return 0;
 784 }
 785
 786 static inline int resize_screen(struct vc_data *vc, int width, int height,
 787                                 int user)
 788 {
 789         /* Resizes the resolution of the display adapater */
 790         int err = 0;
 791
 792         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 793                 err = vc->vc_sw->con_resize(vc, width, height, user);
 794
 795         return err;
 796 }
 797
 798 /*
 799  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 800  * [this is to be used together with some user program
 801  * like resize that changes the hardware videomode]
 802  */
 803 #define VC_RESIZE_MAXCOL (32767)
 804 #define VC_RESIZE_MAXROW (32767)
 805
 806 /**
 807  *      vc_do_resize    -       resizing method for the tty
 808  *      @tty: tty being resized
 809  *      @real_tty: real tty (different to tty if a pty/tty pair)
 810  *      @vc: virtual console private data
 811  *      @cols: columns
 812  *      @lines: lines
 813  *
 814  *      Resize a virtual console, clipping according to the actual constraints.
 815  *      If the caller passes a tty structure then update the termios winsize
 816  *      information and perform any neccessary signal handling.
 817  *
 818  *      Caller must hold the console semaphore. Takes the termios mutex and
 819  *      ctrl_lock of the tty IFF a tty is passed.
 820  */
 821
 822 static int vc_do_resize(struct tty_struct *tty, struct tty_struct *real_tty,
 823                 struct vc_data *vc, unsigned int cols, unsigned int lines)
 824 {
 825         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 826         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 827         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 828         unsigned int end, user;
 829         unsigned short *newscreen;
 830
 831         WARN_CONSOLE_UNLOCKED();
 832
 833         if (!vc)
 834                 return -ENXIO;
 835
 836         user = vc->vc_resize_user;
 837         vc->vc_resize_user = 0;
 838
 839         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 840                 return -EINVAL;
 841
 842         new_cols = (cols ? cols : vc->vc_cols);
 843         new_rows = (lines ? lines : vc->vc_rows);
 844         new_row_size = new_cols << 1;
 845         new_screen_size = new_row_size * new_rows;
 846
 847         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 848                 return 0;
 849
 850         newscreen = kmalloc(new_screen_size, GFP_USER);
 851         if (!newscreen)
 852                 return -ENOMEM;
 853
 854         old_rows = vc->vc_rows;
 855         old_cols = vc->vc_cols;
 856         old_row_size = vc->vc_size_row;
 857         old_screen_size = vc->vc_screenbuf_size;
 858
 859         err = resize_screen(vc, new_cols, new_rows, user);
 860         if (err) {
 861                 kfree(newscreen);
 862                 return err;
 863         }
 864
 865         vc->vc_rows = new_rows;
 866         vc->vc_cols = new_cols;
 867         vc->vc_size_row = new_row_size;
 868         vc->vc_screenbuf_size = new_screen_size;
 869
 870         rlth = min(old_row_size, new_row_size);
 871         rrem = new_row_size - rlth;
 872         old_origin = vc->vc_origin;
 873         new_origin = (long) newscreen;
 874         new_scr_end = new_origin + new_screen_size;
 875
 876         if (vc->vc_y > new_rows) {
 877                 if (old_rows - vc->vc_y < new_rows) {
 878                         /*
 879                          * Cursor near the bottom, copy contents from the
 880                          * bottom of buffer
 881                          */
 882                         old_origin += (old_rows - new_rows) * old_row_size;
 883                         end = vc->vc_scr_end;
 884                 } else {
 885                         /*
 886                          * Cursor is in no man's land, copy 1/2 screenful
 887                          * from the top and bottom of cursor position
 888                          */
 889                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 890                         end = old_origin + (old_row_size * new_rows);
 891                 }
 892         } else
 893                 /*
 894                  * Cursor near the top, copy contents from the top of buffer
 895                  */
 896                 end = (old_rows > new_rows) ? old_origin +
 897                         (old_row_size * new_rows) :
 898                         vc->vc_scr_end;
 899
 900         update_attr(vc);
 901
 902         while (old_origin < end) {
 903                 scr_memcpyw((unsigned short *) new_origin,
 904                             (unsigned short *) old_origin, rlth);
 905                 if (rrem)
 906                         scr_memsetw((void *)(new_origin + rlth),
 907                                     vc->vc_video_erase_char, rrem);
 908                 old_origin += old_row_size;
 909                 new_origin += new_row_size;
 910         }
 911         if (new_scr_end > new_origin)
 912                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 913                             new_scr_end - new_origin);
 914         if (vc->vc_kmalloced)
 915                 kfree(vc->vc_screenbuf);
 916         vc->vc_screenbuf = newscreen;
 917         vc->vc_kmalloced = 1;
 918         vc->vc_screenbuf_size = new_screen_size;
 919         set_origin(vc);
 920
 921         /* do part of a reset_terminal() */
 922         vc->vc_top = 0;
 923         vc->vc_bottom = vc->vc_rows;
 924         gotoxy(vc, vc->vc_x, vc->vc_y);
 925         save_cur(vc);
 926
 927         if (tty) {
 928                 /* Rewrite the requested winsize data with the actual
 929                    resulting sizes */
 930                 struct winsize ws;
 931                 memset(&ws, 0, sizeof(ws));
 932                 ws.ws_row = vc->vc_rows;
 933                 ws.ws_col = vc->vc_cols;
 934                 ws.ws_ypixel = vc->vc_scan_lines;
 935                 tty_do_resize(tty, real_tty, &ws);
 936         }
 937
 938         if (CON_IS_VISIBLE(vc))
 939                 update_screen(vc);
 940         return err;
 941 }
 942
 943 /**
 944  *      vc_resize               -       resize a VT
 945  *      @vc: virtual console
 946  *      @cols: columns
 947  *      @rows: rows
 948  *
 949  *      Resize a virtual console as seen from the console end of things. We
 950  *      use the common vc_do_resize methods to update the structures. The
 951  *      caller must hold the console sem to protect console internals and
 952  *      vc->vc_tty
 953  */
 954
 955 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 956 {
 957         return vc_do_resize(vc->vc_tty, vc->vc_tty, vc, cols, rows);
 958 }
 959
 960 /**
 961  *      vt_resize               -       resize a VT
 962  *      @tty: tty to resize
 963  *      @real_tty: tty if a pty/tty pair
 964  *      @ws: winsize attributes
 965  *
 966  *      Resize a virtual terminal. This is called by the tty layer as we
 967  *      register our own handler for resizing. The mutual helper does all
 968  *      the actual work.
 969  *
 970  *      Takes the console sem and the called methods then take the tty
 971  *      termios_mutex and the tty ctrl_lock in that order.
 972  */
 973
 974 int vt_resize(struct tty_struct *tty, struct tty_struct *real_tty,
 975         struct winsize *ws)
 976 {
 977         struct vc_data *vc = tty->driver_data;
 978         int ret;
 979
 980         acquire_console_sem();
 981         ret = vc_do_resize(tty, real_tty, vc, ws->ws_col, ws->ws_row);
 982         release_console_sem();
 983         return ret;
 984 }
 985
 986 void vc_deallocate(unsigned int currcons)
 987 {
 988         WARN_CONSOLE_UNLOCKED();
 989
 990         if (vc_cons_allocated(currcons)) {
 991                 struct vc_data *vc = vc_cons[currcons].d;
 992                 struct vt_notifier_param param = { .vc = vc };
 993                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 994                 vc->vc_sw->con_deinit(vc);
 995                 put_pid(vc->vt_pid);
 996                 module_put(vc->vc_sw->owner);
 997                 if (vc->vc_kmalloced)
 998                         kfree(vc->vc_screenbuf);
 999                 if (currcons >= MIN_NR_CONSOLES)
1000                         kfree(vc);
1001                 vc_cons[currcons].d = NULL;
1002         }
1003 }
1004
1005 /*
1006  *      VT102 emulator
1007  */
1008
1009 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1010 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1011 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1012
1013 #define decarm          VC_REPEAT
1014 #define decckm          VC_CKMODE
1015 #define kbdapplic       VC_APPLIC
1016 #define lnm             VC_CRLF
1017
1018 /*
1019  * this is what the terminal answers to a ESC-Z or csi0c query.
1020  */
1021 #define VT100ID "\033[?1;2c"
1022 #define VT102ID "\033[?6c"
1023
1024 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1025                                        8,12,10,14, 9,13,11,15 };
1026
1027 /* the default colour table, for VGA+ colour systems */
1028 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1029     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1030 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1031     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1032 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1033     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1034
1035 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1036 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1037 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1038
1039 /*
1040  * gotoxy() must verify all boundaries, because the arguments
1041  * might also be negative. If the given position is out of
1042  * bounds, the cursor is placed at the nearest margin.
1043  */
1044 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1045 {
1046         int min_y, max_y;
1047
1048         if (new_x < 0)
1049                 vc->vc_x = 0;
1050         else {
1051                 if (new_x >= vc->vc_cols)
1052                         vc->vc_x = vc->vc_cols - 1;
1053                 else
1054                         vc->vc_x = new_x;
1055         }
1056
1057         if (vc->vc_decom) {
1058                 min_y = vc->vc_top;
1059                 max_y = vc->vc_bottom;
1060         } else {
1061                 min_y = 0;
1062                 max_y = vc->vc_rows;
1063         }
1064         if (new_y < min_y)
1065                 vc->vc_y = min_y;
1066         else if (new_y >= max_y)
1067                 vc->vc_y = max_y - 1;
1068         else
1069                 vc->vc_y = new_y;
1070         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1071         vc->vc_need_wrap = 0;
1072 }
1073
1074 /* for absolute user moves, when decom is set */
1075 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1076 {
1077         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1078 }
1079
1080 void scrollback(struct vc_data *vc, int lines)
1081 {
1082         if (!lines)
1083                 lines = vc->vc_rows / 2;
1084         scrolldelta(-lines);
1085 }
1086
1087 void scrollfront(struct vc_data *vc, int lines)
1088 {
1089         if (!lines)
1090                 lines = vc->vc_rows / 2;
1091         scrolldelta(lines);
1092 }
1093
1094 static void lf(struct vc_data *vc)
1095 {
1096         /* don't scroll if above bottom of scrolling region, or
1097          * if below scrolling region
1098          */
1099         if (vc->vc_y + 1 == vc->vc_bottom)
1100                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1101         else if (vc->vc_y < vc->vc_rows - 1) {
1102                 vc->vc_y++;
1103                 vc->vc_pos += vc->vc_size_row;
1104         }
1105         vc->vc_need_wrap = 0;
1106         notify_write(vc, '\n');
1107 }
1108
1109 static void ri(struct vc_data *vc)
1110 {
1111         /* don't scroll if below top of scrolling region, or
1112          * if above scrolling region
1113          */
1114         if (vc->vc_y == vc->vc_top)
1115                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1116         else if (vc->vc_y > 0) {
1117                 vc->vc_y--;
1118                 vc->vc_pos -= vc->vc_size_row;
1119         }
1120         vc->vc_need_wrap = 0;
1121 }
1122
1123 static inline void cr(struct vc_data *vc)
1124 {
1125         vc->vc_pos -= vc->vc_x << 1;
1126         vc->vc_need_wrap = vc->vc_x = 0;
1127         notify_write(vc, '\r');
1128 }
1129
1130 static inline void bs(struct vc_data *vc)
1131 {
1132         if (vc->vc_x) {
1133                 vc->vc_pos -= 2;
1134                 vc->vc_x--;
1135                 vc->vc_need_wrap = 0;
1136                 notify_write(vc, '\b');
1137         }
1138 }
1139
1140 static inline void del(struct vc_data *vc)
1141 {
1142         /* ignored */
1143 }
1144
1145 static void csi_J(struct vc_data *vc, int vpar)
1146 {
1147         unsigned int count;
1148         unsigned short * start;
1149
1150         switch (vpar) {
1151                 case 0: /* erase from cursor to end of display */
1152                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1153                         start = (unsigned short *)vc->vc_pos;
1154                         if (DO_UPDATE(vc)) {
1155                                 /* do in two stages */
1156                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1157                                               vc->vc_cols - vc->vc_x);
1158                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1159                                               vc->vc_rows - vc->vc_y - 1,
1160                                               vc->vc_cols);
1161                         }
1162                         break;
1163                 case 1: /* erase from start to cursor */
1164                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1165                         start = (unsigned short *)vc->vc_origin;
1166                         if (DO_UPDATE(vc)) {
1167                                 /* do in two stages */
1168                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1169                                               vc->vc_cols);
1170                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1171                                               vc->vc_x + 1);
1172                         }
1173                         break;
1174                 case 2: /* erase whole display */
1175                         count = vc->vc_cols * vc->vc_rows;
1176                         start = (unsigned short *)vc->vc_origin;
1177                         if (DO_UPDATE(vc))
1178                                 vc->vc_sw->con_clear(vc, 0, 0,
1179                                               vc->vc_rows,
1180                                               vc->vc_cols);
1181                         break;
1182                 default:
1183                         return;
1184         }
1185         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1186         vc->vc_need_wrap = 0;
1187 }
1188
1189 static void csi_K(struct vc_data *vc, int vpar)
1190 {
1191         unsigned int count;
1192         unsigned short * start;
1193
1194         switch (vpar) {
1195                 case 0: /* erase from cursor to end of line */
1196                         count = vc->vc_cols - vc->vc_x;
1197                         start = (unsigned short *)vc->vc_pos;
1198                         if (DO_UPDATE(vc))
1199                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1200                                                      vc->vc_cols - vc->vc_x);
1201                         break;
1202                 case 1: /* erase from start of line to cursor */
1203                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1204                         count = vc->vc_x + 1;
1205                         if (DO_UPDATE(vc))
1206                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1207                                                      vc->vc_x + 1);
1208                         break;
1209                 case 2: /* erase whole line */
1210                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1211                         count = vc->vc_cols;
1212                         if (DO_UPDATE(vc))
1213                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1214                                               vc->vc_cols);
1215                         break;
1216                 default:
1217                         return;
1218         }
1219         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1220         vc->vc_need_wrap = 0;
1221 }
1222
1223 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1224 {                                         /* not vt100? */
1225         int count;
1226
1227         if (!vpar)
1228                 vpar++;
1229         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1230
1231         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1232         if (DO_UPDATE(vc))
1233                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1234         vc->vc_need_wrap = 0;
1235 }
1236
1237 static void default_attr(struct vc_data *vc)
1238 {
1239         vc->vc_intensity = 1;
1240         vc->vc_italic = 0;
1241         vc->vc_underline = 0;
1242         vc->vc_reverse = 0;
1243         vc->vc_blink = 0;
1244         vc->vc_color = vc->vc_def_color;
1245 }
1246
1247 /* console_sem is held */
1248 static void csi_m(struct vc_data *vc)
1249 {
1250         int i;
1251
1252         for (i = 0; i <= vc->vc_npar; i++)
1253                 switch (vc->vc_par[i]) {
1254                         case 0: /* all attributes off */
1255                                 default_attr(vc);
1256                                 break;
1257                         case 1:
1258                                 vc->vc_intensity = 2;
1259                                 break;
1260                         case 2:
1261                                 vc->vc_intensity = 0;
1262                                 break;
1263                         case 3:
1264                                 vc->vc_italic = 1;
1265                                 break;
1266                         case 4:
1267                                 vc->vc_underline = 1;
1268                                 break;
1269                         case 5:
1270                                 vc->vc_blink = 1;
1271                                 break;
1272                         case 7:
1273                                 vc->vc_reverse = 1;
1274                                 break;
1275                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1276                                   * Select primary font, don't display
1277                                   * control chars if defined, don't set
1278                                   * bit 8 on output.
1279                                   */
1280                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1281                                                 ? vc->vc_G0_charset
1282                                                 : vc->vc_G1_charset, vc);
1283                                 vc->vc_disp_ctrl = 0;
1284                                 vc->vc_toggle_meta = 0;
1285                                 break;
1286                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1287                                   * Select first alternate font, lets
1288                                   * chars < 32 be displayed as ROM chars.
1289                                   */
1290                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1291                                 vc->vc_disp_ctrl = 1;
1292                                 vc->vc_toggle_meta = 0;
1293                                 break;
1294                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1295                                   * Select second alternate font, toggle
1296                                   * high bit before displaying as ROM char.
1297                                   */
1298                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1299                                 vc->vc_disp_ctrl = 1;
1300                                 vc->vc_toggle_meta = 1;
1301                                 break;
1302                         case 21:
1303                         case 22:
1304                                 vc->vc_intensity = 1;
1305                                 break;
1306                         case 23:
1307                                 vc->vc_italic = 0;
1308                                 break;
1309                         case 24:
1310                                 vc->vc_underline = 0;
1311                                 break;
1312                         case 25:
1313                                 vc->vc_blink = 0;
1314                                 break;
1315                         case 27:
1316                                 vc->vc_reverse = 0;
1317                                 break;
1318                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1319                                   * Enables underscore, white foreground
1320                                   * with white underscore (Linux - use
1321                                   * default foreground).
1322                                   */
1323                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1324                                 vc->vc_underline = 1;
1325                                 break;
1326                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1327                                   * Disable underline option.
1328                                   * Reset colour to default? It did this
1329                                   * before...
1330                                   */
1331                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1332                                 vc->vc_underline = 0;
1333                                 break;
1334                         case 49:
1335                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1336                                 break;
1337                         default:
1338                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1339                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1340                                                 | (vc->vc_color & 0xf0);
1341                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1342                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1343                                                 | (vc->vc_color & 0x0f);
1344                                 break;
1345                 }
1346         update_attr(vc);
1347 }
1348
1349 static void respond_string(const char *p, struct tty_struct *tty)
1350 {
1351         while (*p) {
1352                 tty_insert_flip_char(tty, *p, 0);
1353                 p++;
1354         }
1355         con_schedule_flip(tty);
1356 }
1357
1358 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1359 {
1360         char buf[40];
1361
1362         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1363         respond_string(buf, tty);
1364 }
1365
1366 static inline void status_report(struct tty_struct *tty)
1367 {
1368         respond_string("\033[0n", tty); /* Terminal ok */
1369 }
1370
1371 static inline void respond_ID(struct tty_struct * tty)
1372 {
1373         respond_string(VT102ID, tty);
1374 }
1375
1376 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1377 {
1378         char buf[8];
1379
1380         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1381                 (char)('!' + mry));
1382         respond_string(buf, tty);
1383 }
1384
1385 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1386 int mouse_reporting(void)
1387 {
1388         return vc_cons[fg_console].d->vc_report_mouse;
1389 }
1390
1391 /* console_sem is held */
1392 static void set_mode(struct vc_data *vc, int on_off)
1393 {
1394         int i;
1395
1396         for (i = 0; i <= vc->vc_npar; i++)
1397                 if (vc->vc_ques) {
1398                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1399                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1400                                 if (on_off)
1401                                         set_kbd(vc, decckm);
1402                                 else
1403                                         clr_kbd(vc, decckm);
1404                                 break;
1405                         case 3: /* 80/132 mode switch unimplemented */
1406                                 vc->vc_deccolm = on_off;
1407 #if 0
1408                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1409                                 /* this alone does not suffice; some user mode
1410                                    utility has to change the hardware regs */
1411 #endif
1412                                 break;
1413                         case 5:                 /* Inverted screen on/off */
1414                                 if (vc->vc_decscnm != on_off) {
1415                                         vc->vc_decscnm = on_off;
1416                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1417                                         update_attr(vc);
1418                                 }
1419                                 break;
1420                         case 6:                 /* Origin relative/absolute */
1421                                 vc->vc_decom = on_off;
1422                                 gotoxay(vc, 0, 0);
1423                                 break;
1424                         case 7:                 /* Autowrap on/off */
1425                                 vc->vc_decawm = on_off;
1426                                 break;
1427                         case 8:                 /* Autorepeat on/off */
1428                                 if (on_off)
1429                                         set_kbd(vc, decarm);
1430                                 else
1431                                         clr_kbd(vc, decarm);
1432                                 break;
1433                         case 9:
1434                                 vc->vc_report_mouse = on_off ? 1 : 0;
1435                                 break;
1436                         case 25:                /* Cursor on/off */
1437                                 vc->vc_deccm = on_off;
1438                                 break;
1439                         case 1000:
1440                                 vc->vc_report_mouse = on_off ? 2 : 0;
1441                                 break;
1442                         }
1443                 } else {
1444                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1445                         case 3:                 /* Monitor (display ctrls) */
1446                                 vc->vc_disp_ctrl = on_off;
1447                                 break;
1448                         case 4:                 /* Insert Mode on/off */
1449                                 vc->vc_decim = on_off;
1450                                 break;
1451                         case 20:                /* Lf, Enter == CrLf/Lf */
1452                                 if (on_off)
1453                                         set_kbd(vc, lnm);
1454                                 else
1455                                         clr_kbd(vc, lnm);
1456                                 break;
1457                         }
1458                 }
1459 }
1460
1461 /* console_sem is held */
1462 static void setterm_command(struct vc_data *vc)
1463 {
1464         switch(vc->vc_par[0]) {
1465                 case 1: /* set color for underline mode */
1466                         if (vc->vc_can_do_color &&
1467                                         vc->vc_par[1] < 16) {
1468                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1469                                 if (vc->vc_underline)
1470                                         update_attr(vc);
1471                         }
1472                         break;
1473                 case 2: /* set color for half intensity mode */
1474                         if (vc->vc_can_do_color &&
1475                                         vc->vc_par[1] < 16) {
1476                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1477                                 if (vc->vc_intensity == 0)
1478                                         update_attr(vc);
1479                         }
1480                         break;
1481                 case 8: /* store colors as defaults */
1482                         vc->vc_def_color = vc->vc_attr;
1483                         if (vc->vc_hi_font_mask == 0x100)
1484                                 vc->vc_def_color >>= 1;
1485                         default_attr(vc);
1486                         update_attr(vc);
1487                         break;
1488                 case 9: /* set blanking interval */
1489                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1490                         poke_blanked_console();
1491                         break;
1492                 case 10: /* set bell frequency in Hz */
1493                         if (vc->vc_npar >= 1)
1494                                 vc->vc_bell_pitch = vc->vc_par[1];
1495                         else
1496                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1497                         break;
1498                 case 11: /* set bell duration in msec */
1499                         if (vc->vc_npar >= 1)
1500                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1501                                         vc->vc_par[1] * HZ / 1000 : 0;
1502                         else
1503                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1504                         break;
1505                 case 12: /* bring specified console to the front */
1506                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1507                                 set_console(vc->vc_par[1] - 1);
1508                         break;
1509                 case 13: /* unblank the screen */
1510                         poke_blanked_console();
1511                         break;
1512                 case 14: /* set vesa powerdown interval */
1513                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1514                         break;
1515                 case 15: /* activate the previous console */
1516                         set_console(last_console);
1517                         break;
1518         }
1519 }
1520
1521 /* console_sem is held */
1522 static void csi_at(struct vc_data *vc, unsigned int nr)
1523 {
1524         if (nr > vc->vc_cols - vc->vc_x)
1525                 nr = vc->vc_cols - vc->vc_x;
1526         else if (!nr)
1527                 nr = 1;
1528         insert_char(vc, nr);
1529 }
1530
1531 /* console_sem is held */
1532 static void csi_L(struct vc_data *vc, unsigned int nr)
1533 {
1534         if (nr > vc->vc_rows - vc->vc_y)
1535                 nr = vc->vc_rows - vc->vc_y;
1536         else if (!nr)
1537                 nr = 1;
1538         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1539         vc->vc_need_wrap = 0;
1540 }
1541
1542 /* console_sem is held */
1543 static void csi_P(struct vc_data *vc, unsigned int nr)
1544 {
1545         if (nr > vc->vc_cols - vc->vc_x)
1546                 nr = vc->vc_cols - vc->vc_x;
1547         else if (!nr)
1548                 nr = 1;
1549         delete_char(vc, nr);
1550 }
1551
1552 /* console_sem is held */
1553 static void csi_M(struct vc_data *vc, unsigned int nr)
1554 {
1555         if (nr > vc->vc_rows - vc->vc_y)
1556                 nr = vc->vc_rows - vc->vc_y;
1557         else if (!nr)
1558                 nr=1;
1559         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1560         vc->vc_need_wrap = 0;
1561 }
1562
1563 /* console_sem is held (except via vc_init->reset_terminal */
1564 static void save_cur(struct vc_data *vc)
1565 {
1566         vc->vc_saved_x          = vc->vc_x;
1567         vc->vc_saved_y          = vc->vc_y;
1568         vc->vc_s_intensity      = vc->vc_intensity;
1569         vc->vc_s_italic         = vc->vc_italic;
1570         vc->vc_s_underline      = vc->vc_underline;
1571         vc->vc_s_blink          = vc->vc_blink;
1572         vc->vc_s_reverse        = vc->vc_reverse;
1573         vc->vc_s_charset        = vc->vc_charset;
1574         vc->vc_s_color          = vc->vc_color;
1575         vc->vc_saved_G0         = vc->vc_G0_charset;
1576         vc->vc_saved_G1         = vc->vc_G1_charset;
1577 }
1578
1579 /* console_sem is held */
1580 static void restore_cur(struct vc_data *vc)
1581 {
1582         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1583         vc->vc_intensity        = vc->vc_s_intensity;
1584         vc->vc_italic           = vc->vc_s_italic;
1585         vc->vc_underline        = vc->vc_s_underline;
1586         vc->vc_blink            = vc->vc_s_blink;
1587         vc->vc_reverse          = vc->vc_s_reverse;
1588         vc->vc_charset          = vc->vc_s_charset;
1589         vc->vc_color            = vc->vc_s_color;
1590         vc->vc_G0_charset       = vc->vc_saved_G0;
1591         vc->vc_G1_charset       = vc->vc_saved_G1;
1592         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1593         update_attr(vc);
1594         vc->vc_need_wrap = 0;
1595 }
1596
1597 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1598         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1599         ESpalette };
1600
1601 /* console_sem is held (except via vc_init()) */
1602 static void reset_terminal(struct vc_data *vc, int do_clear)
1603 {
1604         vc->vc_top              = 0;
1605         vc->vc_bottom           = vc->vc_rows;
1606         vc->vc_state            = ESnormal;
1607         vc->vc_ques             = 0;
1608         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1609         vc->vc_G0_charset       = LAT1_MAP;
1610         vc->vc_G1_charset       = GRAF_MAP;
1611         vc->vc_charset          = 0;
1612         vc->vc_need_wrap        = 0;
1613         vc->vc_report_mouse     = 0;
1614         vc->vc_utf              = default_utf8;
1615         vc->vc_utf_count        = 0;
1616
1617         vc->vc_disp_ctrl        = 0;
1618         vc->vc_toggle_meta      = 0;
1619
1620         vc->vc_decscnm          = 0;
1621         vc->vc_decom            = 0;
1622         vc->vc_decawm           = 1;
1623         vc->vc_deccm            = 1;
1624         vc->vc_decim            = 0;
1625
1626         set_kbd(vc, decarm);
1627         clr_kbd(vc, decckm);
1628         clr_kbd(vc, kbdapplic);
1629         clr_kbd(vc, lnm);
1630         kbd_table[vc->vc_num].lockstate = 0;
1631         kbd_table[vc->vc_num].slockstate = 0;
1632         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1633         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1634         /* do not do set_leds here because this causes an endless tasklet loop
1635            when the keyboard hasn't been initialized yet */
1636
1637         vc->vc_cursor_type = CUR_DEFAULT;
1638         vc->vc_complement_mask = vc->vc_s_complement_mask;
1639
1640         default_attr(vc);
1641         update_attr(vc);
1642
1643         vc->vc_tab_stop[0]      = 0x01010100;
1644         vc->vc_tab_stop[1]      =
1645         vc->vc_tab_stop[2]      =
1646         vc->vc_tab_stop[3]      =
1647         vc->vc_tab_stop[4]      = 0x01010101;
1648
1649         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1650         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1651
1652         gotoxy(vc, 0, 0);
1653         save_cur(vc);
1654         if (do_clear)
1655             csi_J(vc, 2);
1656 }
1657
1658 /* console_sem is held */
1659 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1660 {
1661         /*
1662          *  Control characters can be used in the _middle_
1663          *  of an escape sequence.
1664          */
1665         switch (c) {
1666         case 0:
1667                 return;
1668         case 7:
1669                 if (vc->vc_bell_duration)
1670                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1671                 return;
1672         case 8:
1673                 bs(vc);
1674                 return;
1675         case 9:
1676                 vc->vc_pos -= (vc->vc_x << 1);
1677                 while (vc->vc_x < vc->vc_cols - 1) {
1678                         vc->vc_x++;
1679                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1680                                 break;
1681                 }
1682                 vc->vc_pos += (vc->vc_x << 1);
1683                 notify_write(vc, '\t');
1684                 return;
1685         case 10: case 11: case 12:
1686                 lf(vc);
1687                 if (!is_kbd(vc, lnm))
1688                         return;
1689         case 13:
1690                 cr(vc);
1691                 return;
1692         case 14:
1693                 vc->vc_charset = 1;
1694                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1695                 vc->vc_disp_ctrl = 1;
1696                 return;
1697         case 15:
1698                 vc->vc_charset = 0;
1699                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1700                 vc->vc_disp_ctrl = 0;
1701                 return;
1702         case 24: case 26:
1703                 vc->vc_state = ESnormal;
1704                 return;
1705         case 27:
1706                 vc->vc_state = ESesc;
1707                 return;
1708         case 127:
1709                 del(vc);
1710                 return;
1711         case 128+27:
1712                 vc->vc_state = ESsquare;
1713                 return;
1714         }
1715         switch(vc->vc_state) {
1716         case ESesc:
1717                 vc->vc_state = ESnormal;
1718                 switch (c) {
1719                 case '[':
1720                         vc->vc_state = ESsquare;
1721                         return;
1722                 case ']':
1723                         vc->vc_state = ESnonstd;
1724                         return;
1725                 case '%':
1726                         vc->vc_state = ESpercent;
1727                         return;
1728                 case 'E':
1729                         cr(vc);
1730                         lf(vc);
1731                         return;
1732                 case 'M':
1733                         ri(vc);
1734                         return;
1735                 case 'D':
1736                         lf(vc);
1737                         return;
1738                 case 'H':
1739                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1740                         return;
1741                 case 'Z':
1742                         respond_ID(tty);
1743                         return;
1744                 case '7':
1745                         save_cur(vc);
1746                         return;
1747                 case '8':
1748                         restore_cur(vc);
1749                         return;
1750                 case '(':
1751                         vc->vc_state = ESsetG0;
1752                         return;
1753                 case ')':
1754                         vc->vc_state = ESsetG1;
1755                         return;
1756                 case '#':
1757                         vc->vc_state = EShash;
1758                         return;
1759                 case 'c':
1760                         reset_terminal(vc, 1);
1761                         return;
1762                 case '>':  /* Numeric keypad */
1763                         clr_kbd(vc, kbdapplic);
1764                         return;
1765                 case '=':  /* Appl. keypad */
1766                         set_kbd(vc, kbdapplic);
1767                         return;
1768                 }
1769                 return;
1770         case ESnonstd:
1771                 if (c=='P') {   /* palette escape sequence */
1772                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1773                                 vc->vc_par[vc->vc_npar] = 0;
1774                         vc->vc_npar = 0;
1775                         vc->vc_state = ESpalette;
1776                         return;
1777                 } else if (c=='R') {   /* reset palette */
1778                         reset_palette(vc);
1779                         vc->vc_state = ESnormal;
1780                 } else
1781                         vc->vc_state = ESnormal;
1782                 return;
1783         case ESpalette:
1784                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1785                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1786                         if (vc->vc_npar == 7) {
1787                                 int i = vc->vc_par[0] * 3, j = 1;
1788                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1789                                 vc->vc_palette[i++] += vc->vc_par[j++];
1790                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1791                                 vc->vc_palette[i++] += vc->vc_par[j++];
1792                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1793                                 vc->vc_palette[i] += vc->vc_par[j];
1794                                 set_palette(vc);
1795                                 vc->vc_state = ESnormal;
1796                         }
1797                 } else
1798                         vc->vc_state = ESnormal;
1799                 return;
1800         case ESsquare:
1801                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1802                         vc->vc_par[vc->vc_npar] = 0;
1803                 vc->vc_npar = 0;
1804                 vc->vc_state = ESgetpars;
1805                 if (c == '[') { /* Function key */
1806                         vc->vc_state=ESfunckey;
1807                         return;
1808                 }
1809                 vc->vc_ques = (c == '?');
1810                 if (vc->vc_ques)
1811                         return;
1812         case ESgetpars:
1813                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1814                         vc->vc_npar++;
1815                         return;
1816                 } else if (c>='0' && c<='9') {
1817                         vc->vc_par[vc->vc_npar] *= 10;
1818                         vc->vc_par[vc->vc_npar] += c - '0';
1819                         return;
1820                 } else
1821                         vc->vc_state = ESgotpars;
1822         case ESgotpars:
1823                 vc->vc_state = ESnormal;
1824                 switch(c) {
1825                 case 'h':
1826                         set_mode(vc, 1);
1827                         return;
1828                 case 'l':
1829                         set_mode(vc, 0);
1830                         return;
1831                 case 'c':
1832                         if (vc->vc_ques) {
1833                                 if (vc->vc_par[0])
1834                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1835                                 else
1836                                         vc->vc_cursor_type = CUR_DEFAULT;
1837                                 return;
1838                         }
1839                         break;
1840                 case 'm':
1841                         if (vc->vc_ques) {
1842                                 clear_selection();
1843                                 if (vc->vc_par[0])
1844                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1845                                 else
1846                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1847                                 return;
1848                         }
1849                         break;
1850                 case 'n':
1851                         if (!vc->vc_ques) {
1852                                 if (vc->vc_par[0] == 5)
1853                                         status_report(tty);
1854                                 else if (vc->vc_par[0] == 6)
1855                                         cursor_report(vc, tty);
1856                         }
1857                         return;
1858                 }
1859                 if (vc->vc_ques) {
1860                         vc->vc_ques = 0;
1861                         return;
1862                 }
1863                 switch(c) {
1864                 case 'G': case '`':
1865                         if (vc->vc_par[0])
1866                                 vc->vc_par[0]--;
1867                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1868                         return;
1869                 case 'A':
1870                         if (!vc->vc_par[0])
1871                                 vc->vc_par[0]++;
1872                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1873                         return;
1874                 case 'B': case 'e':
1875                         if (!vc->vc_par[0])
1876                                 vc->vc_par[0]++;
1877                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1878                         return;
1879                 case 'C': case 'a':
1880                         if (!vc->vc_par[0])
1881                                 vc->vc_par[0]++;
1882                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1883                         return;
1884                 case 'D':
1885                         if (!vc->vc_par[0])
1886                                 vc->vc_par[0]++;
1887                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1888                         return;
1889                 case 'E':
1890                         if (!vc->vc_par[0])
1891                                 vc->vc_par[0]++;
1892                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1893                         return;
1894                 case 'F':
1895                         if (!vc->vc_par[0])
1896                                 vc->vc_par[0]++;
1897                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1898                         return;
1899                 case 'd':
1900                         if (vc->vc_par[0])
1901                                 vc->vc_par[0]--;
1902                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1903                         return;
1904                 case 'H': case 'f':
1905                         if (vc->vc_par[0])
1906                                 vc->vc_par[0]--;
1907                         if (vc->vc_par[1])
1908                                 vc->vc_par[1]--;
1909                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1910                         return;
1911                 case 'J':
1912                         csi_J(vc, vc->vc_par[0]);
1913                         return;
1914                 case 'K':
1915                         csi_K(vc, vc->vc_par[0]);
1916                         return;
1917                 case 'L':
1918                         csi_L(vc, vc->vc_par[0]);
1919                         return;
1920                 case 'M':
1921                         csi_M(vc, vc->vc_par[0]);
1922                         return;
1923                 case 'P':
1924                         csi_P(vc, vc->vc_par[0]);
1925                         return;
1926                 case 'c':
1927                         if (!vc->vc_par[0])
1928                                 respond_ID(tty);
1929                         return;
1930                 case 'g':
1931                         if (!vc->vc_par[0])
1932                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1933                         else if (vc->vc_par[0] == 3) {
1934                                 vc->vc_tab_stop[0] =
1935                                         vc->vc_tab_stop[1] =
1936                                         vc->vc_tab_stop[2] =
1937                                         vc->vc_tab_stop[3] =
1938                                         vc->vc_tab_stop[4] = 0;
1939                         }
1940                         return;
1941                 case 'm':
1942                         csi_m(vc);
1943                         return;
1944                 case 'q': /* DECLL - but only 3 leds */
1945                         /* map 0,1,2,3 to 0,1,2,4 */
1946                         if (vc->vc_par[0] < 4)
1947                                 setledstate(kbd_table + vc->vc_num,
1948                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1949                         return;
1950                 case 'r':
1951                         if (!vc->vc_par[0])
1952                                 vc->vc_par[0]++;
1953                         if (!vc->vc_par[1])
1954                                 vc->vc_par[1] = vc->vc_rows;
1955                         /* Minimum allowed region is 2 lines */
1956                         if (vc->vc_par[0] < vc->vc_par[1] &&
1957                             vc->vc_par[1] <= vc->vc_rows) {
1958                                 vc->vc_top = vc->vc_par[0] - 1;
1959                                 vc->vc_bottom = vc->vc_par[1];
1960                                 gotoxay(vc, 0, 0);
1961                         }
1962                         return;
1963                 case 's':
1964                         save_cur(vc);
1965                         return;
1966                 case 'u':
1967                         restore_cur(vc);
1968                         return;
1969                 case 'X':
1970                         csi_X(vc, vc->vc_par[0]);
1971                         return;
1972                 case '@':
1973                         csi_at(vc, vc->vc_par[0]);
1974                         return;
1975                 case ']': /* setterm functions */
1976                         setterm_command(vc);
1977                         return;
1978                 }
1979                 return;
1980         case ESpercent:
1981                 vc->vc_state = ESnormal;
1982                 switch (c) {
1983                 case '@':  /* defined in ISO 2022 */
1984                         vc->vc_utf = 0;
1985                         return;
1986                 case 'G':  /* prelim official escape code */
1987                 case '8':  /* retained for compatibility */
1988                         vc->vc_utf = 1;
1989                         return;
1990                 }
1991                 return;
1992         case ESfunckey:
1993                 vc->vc_state = ESnormal;
1994                 return;
1995         case EShash:
1996                 vc->vc_state = ESnormal;
1997                 if (c == '8') {
1998                         /* DEC screen alignment test. kludge :-) */
1999                         vc->vc_video_erase_char =
2000                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2001                         csi_J(vc, 2);
2002                         vc->vc_video_erase_char =
2003                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2004                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2005                 }
2006                 return;
2007         case ESsetG0:
2008                 if (c == '0')
2009                         vc->vc_G0_charset = GRAF_MAP;
2010                 else if (c == 'B')
2011                         vc->vc_G0_charset = LAT1_MAP;
2012                 else if (c == 'U')
2013                         vc->vc_G0_charset = IBMPC_MAP;
2014                 else if (c == 'K')
2015                         vc->vc_G0_charset = USER_MAP;
2016                 if (vc->vc_charset == 0)
2017                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2018                 vc->vc_state = ESnormal;
2019                 return;
2020         case ESsetG1:
2021                 if (c == '0')
2022                         vc->vc_G1_charset = GRAF_MAP;
2023                 else if (c == 'B')
2024                         vc->vc_G1_charset = LAT1_MAP;
2025                 else if (c == 'U')
2026                         vc->vc_G1_charset = IBMPC_MAP;
2027                 else if (c == 'K')
2028                         vc->vc_G1_charset = USER_MAP;
2029                 if (vc->vc_charset == 1)
2030                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2031                 vc->vc_state = ESnormal;
2032                 return;
2033         default:
2034                 vc->vc_state = ESnormal;
2035         }
2036 }
2037
2038 /* This is a temporary buffer used to prepare a tty console write
2039  * so that we can easily avoid touching user space while holding the
2040  * console spinlock.  It is allocated in con_init and is shared by
2041  * this code and the vc_screen read/write tty calls.
2042  *
2043  * We have to allocate this statically in the kernel data section
2044  * since console_init (and thus con_init) are called before any
2045  * kernel memory allocation is available.
2046  */
2047 char con_buf[CON_BUF_SIZE];
2048 DEFINE_MUTEX(con_buf_mtx);
2049
2050 /* is_double_width() is based on the wcwidth() implementation by
2051  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2052  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2053  */
2054 struct interval {
2055         uint32_t first;
2056         uint32_t last;
2057 };
2058
2059 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2060 {
2061         int min = 0;
2062         int mid;
2063
2064         if (ucs < table[0].first || ucs > table[max].last)
2065                 return 0;
2066         while (max >= min) {
2067                 mid = (min + max) / 2;
2068                 if (ucs > table[mid].last)
2069                         min = mid + 1;
2070                 else if (ucs < table[mid].first)
2071                         max = mid - 1;
2072                 else
2073                         return 1;
2074         }
2075         return 0;
2076 }
2077
2078 static int is_double_width(uint32_t ucs)
2079 {
2080         static const struct interval double_width[] = {
2081                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2082                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2083                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2084                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2085         };
2086         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2087 }
2088
2089 /* acquires console_sem */
2090 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2091 {
2092 #ifdef VT_BUF_VRAM_ONLY
2093 #define FLUSH do { } while(0);
2094 #else
2095 #define FLUSH if (draw_x >= 0) { \
2096         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2097         draw_x = -1; \
2098         }
2099 #endif
2100
2101         int c, tc, ok, n = 0, draw_x = -1;
2102         unsigned int currcons;
2103         unsigned long draw_from = 0, draw_to = 0;
2104         struct vc_data *vc;
2105         unsigned char vc_attr;
2106         struct vt_notifier_param param;
2107         uint8_t rescan;
2108         uint8_t inverse;
2109         uint8_t width;
2110         u16 himask, charmask;
2111         const unsigned char *orig_buf = NULL;
2112         int orig_count;
2113
2114         if (in_interrupt())
2115                 return count;
2116
2117         might_sleep();
2118
2119         acquire_console_sem();
2120         vc = tty->driver_data;
2121         if (vc == NULL) {
2122                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2123                 release_console_sem();
2124                 return 0;
2125         }
2126
2127         currcons = vc->vc_num;
2128         if (!vc_cons_allocated(currcons)) {
2129             /* could this happen? */
2130             static int error = 0;
2131             if (!error) {
2132                 error = 1;
2133                 printk("con_write: tty %d not allocated\n", currcons+1);
2134             }
2135             release_console_sem();
2136             return 0;
2137         }
2138         release_console_sem();
2139
2140         orig_buf = buf;
2141         orig_count = count;
2142
2143         /* At this point 'buf' is guaranteed to be a kernel buffer
2144          * and therefore no access to userspace (and therefore sleeping)
2145          * will be needed.  The con_buf_mtx serializes all tty based
2146          * console rendering and vcs write/read operations.  We hold
2147          * the console spinlock during the entire write.
2148          */
2149
2150         acquire_console_sem();
2151
2152         vc = tty->driver_data;
2153         if (vc == NULL) {
2154                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2155                 release_console_sem();
2156                 goto out;
2157         }
2158
2159         himask = vc->vc_hi_font_mask;
2160         charmask = himask ? 0x1ff : 0xff;
2161
2162         /* undraw cursor first */
2163         if (IS_FG(vc))
2164                 hide_cursor(vc);
2165
2166         param.vc = vc;
2167
2168         while (!tty->stopped && count) {
2169                 int orig = *buf;
2170                 c = orig;
2171                 buf++;
2172                 n++;
2173                 count--;
2174                 rescan = 0;
2175                 inverse = 0;
2176                 width = 1;
2177
2178                 /* Do no translation at all in control states */
2179                 if (vc->vc_state != ESnormal) {
2180                         tc = c;
2181                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2182                     /* Combine UTF-8 into Unicode in vc_utf_char.
2183                      * vc_utf_count is the number of continuation bytes still
2184                      * expected to arrive.
2185                      * vc_npar is the number of continuation bytes arrived so
2186                      * far
2187                      */
2188 rescan_last_byte:
2189                     if ((c & 0xc0) == 0x80) {
2190                         /* Continuation byte received */
2191                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2192                         if (vc->vc_utf_count) {
2193                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2194                             vc->vc_npar++;
2195                             if (--vc->vc_utf_count) {
2196                                 /* Still need some bytes */
2197                                 continue;
2198                             }
2199                             /* Got a whole character */
2200                             c = vc->vc_utf_char;
2201                             /* Reject overlong sequences */
2202                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2203                                         c > utf8_length_changes[vc->vc_npar])
2204                                 c = 0xfffd;
2205                         } else {
2206                             /* Unexpected continuation byte */
2207                             vc->vc_utf_count = 0;
2208                             c = 0xfffd;
2209                         }
2210                     } else {
2211                         /* Single ASCII byte or first byte of a sequence received */
2212                         if (vc->vc_utf_count) {
2213                             /* Continuation byte expected */
2214                             rescan = 1;
2215                             vc->vc_utf_count = 0;
2216                             c = 0xfffd;
2217                         } else if (c > 0x7f) {
2218                             /* First byte of a multibyte sequence received */
2219                             vc->vc_npar = 0;
2220                             if ((c & 0xe0) == 0xc0) {
2221                                 vc->vc_utf_count = 1;
2222                                 vc->vc_utf_char = (c & 0x1f);
2223                             } else if ((c & 0xf0) == 0xe0) {
2224                                 vc->vc_utf_count = 2;
2225                                 vc->vc_utf_char = (c & 0x0f);
2226                             } else if ((c & 0xf8) == 0xf0) {
2227                                 vc->vc_utf_count = 3;
2228                                 vc->vc_utf_char = (c & 0x07);
2229                             } else if ((c & 0xfc) == 0xf8) {
2230                                 vc->vc_utf_count = 4;
2231                                 vc->vc_utf_char = (c & 0x03);
2232                             } else if ((c & 0xfe) == 0xfc) {
2233                                 vc->vc_utf_count = 5;
2234                                 vc->vc_utf_char = (c & 0x01);
2235                             } else {
2236                                 /* 254 and 255 are invalid */
2237                                 c = 0xfffd;
2238                             }
2239                             if (vc->vc_utf_count) {
2240                                 /* Still need some bytes */
2241                                 continue;
2242                             }
2243                         }
2244                         /* Nothing to do if an ASCII byte was received */
2245                     }
2246                     /* End of UTF-8 decoding. */
2247                     /* c is the received character, or U+FFFD for invalid sequences. */
2248                     /* Replace invalid Unicode code points with U+FFFD too */
2249                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2250                         c = 0xfffd;
2251                     tc = c;
2252                 } else {        /* no utf or alternate charset mode */
2253                     tc = vc_translate(vc, c);
2254                 }
2255
2256                 param.c = tc;
2257                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2258                                         &param) == NOTIFY_STOP)
2259                         continue;
2260
2261                 /* If the original code was a control character we
2262                  * only allow a glyph to be displayed if the code is
2263                  * not normally used (such as for cursor movement) or
2264                  * if the disp_ctrl mode has been explicitly enabled.
2265                  * Certain characters (as given by the CTRL_ALWAYS
2266                  * bitmap) are always displayed as control characters,
2267                  * as the console would be pretty useless without
2268                  * them; to display an arbitrary font position use the
2269                  * direct-to-font zone in UTF-8 mode.
2270                  */
2271                 ok = tc && (c >= 32 ||
2272                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2273                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2274                         && (c != 127 || vc->vc_disp_ctrl)
2275                         && (c != 128+27);
2276
2277                 if (vc->vc_state == ESnormal && ok) {
2278                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2279                                 if (is_double_width(c))
2280                                         width = 2;
2281                         }
2282                         /* Now try to find out how to display it */
2283                         tc = conv_uni_to_pc(vc, tc);
2284                         if (tc & ~charmask) {
2285                                 if (tc == -1 || tc == -2) {
2286                                     continue; /* nothing to display */
2287                                 }
2288                                 /* Glyph not found */
2289                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) && c < 128) && !(c & ~charmask)) {
2290                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2291                                        This would make absolutely no sense with Unicode in mind,
2292                                        but do this for ASCII characters since a font may lack
2293                                        Unicode mapping info and we don't want to end up with
2294                                        having question marks only. */
2295                                     tc = c;
2296                                 } else {
2297                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2298                                     tc = conv_uni_to_pc(vc, 0xfffd);
2299                                     if (tc < 0) {
2300                                         inverse = 1;
2301                                         tc = conv_uni_to_pc(vc, '?');
2302                                         if (tc < 0) tc = '?';
2303                                     }
2304                                 }
2305                         }
2306
2307                         if (!inverse) {
2308                                 vc_attr = vc->vc_attr;
2309                         } else {
2310                                 /* invert vc_attr */
2311                                 if (!vc->vc_can_do_color) {
2312                                         vc_attr = (vc->vc_attr) ^ 0x08;
2313                                 } else if (vc->vc_hi_font_mask == 0x100) {
2314                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2315                                 } else {
2316                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2317                                 }
2318                                 FLUSH
2319                         }
2320
2321                         while (1) {
2322                                 if (vc->vc_need_wrap || vc->vc_decim)
2323                                         FLUSH
2324                                 if (vc->vc_need_wrap) {
2325                                         cr(vc);
2326                                         lf(vc);
2327                                 }
2328                                 if (vc->vc_decim)
2329                                         insert_char(vc, 1);
2330                                 scr_writew(himask ?
2331                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2332                                              (vc_attr << 8) + tc,
2333                                            (u16 *) vc->vc_pos);
2334                                 if (DO_UPDATE(vc) && draw_x < 0) {
2335                                         draw_x = vc->vc_x;
2336                                         draw_from = vc->vc_pos;
2337                                 }
2338                                 if (vc->vc_x == vc->vc_cols - 1) {
2339                                         vc->vc_need_wrap = vc->vc_decawm;
2340                                         draw_to = vc->vc_pos + 2;
2341                                 } else {
2342                                         vc->vc_x++;
2343                                         draw_to = (vc->vc_pos += 2);
2344                                 }
2345
2346                                 if (!--width) break;
2347
2348                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2349                                 if (tc < 0) tc = ' ';
2350                         }
2351                         notify_write(vc, c);
2352
2353                         if (inverse) {
2354                                 FLUSH
2355                         }
2356
2357                         if (rescan) {
2358                                 rescan = 0;
2359                                 inverse = 0;
2360                                 width = 1;
2361                                 c = orig;
2362                                 goto rescan_last_byte;
2363                         }
2364                         continue;
2365                 }
2366                 FLUSH
2367                 do_con_trol(tty, vc, orig);
2368         }
2369         FLUSH
2370         console_conditional_schedule();
2371         release_console_sem();
2372
2373 out:
2374         notify_update(vc);
2375         return n;
2376 #undef FLUSH
2377 }
2378
2379 /*
2380  * This is the console switching callback.
2381  *
2382  * Doing console switching in a process context allows
2383  * us to do the switches asynchronously (needed when we want
2384  * to switch due to a keyboard interrupt).  Synchronization
2385  * with other console code and prevention of re-entrancy is
2386  * ensured with console_sem.
2387  */
2388 static void console_callback(struct work_struct *ignored)
2389 {
2390         acquire_console_sem();
2391
2392         if (want_console >= 0) {
2393                 if (want_console != fg_console &&
2394                     vc_cons_allocated(want_console)) {
2395                         hide_cursor(vc_cons[fg_console].d);
2396                         change_console(vc_cons[want_console].d);
2397                         /* we only changed when the console had already
2398                            been allocated - a new console is not created
2399                            in an interrupt routine */
2400                 }
2401                 want_console = -1;
2402         }
2403         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2404                 do_poke_blanked_console = 0;
2405                 poke_blanked_console();
2406         }
2407         if (scrollback_delta) {
2408                 struct vc_data *vc = vc_cons[fg_console].d;
2409                 clear_selection();
2410                 if (vc->vc_mode == KD_TEXT)
2411                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2412                 scrollback_delta = 0;
2413         }
2414         if (blank_timer_expired) {
2415                 do_blank_screen(0);
2416                 blank_timer_expired = 0;
2417         }
2418         notify_update(vc_cons[fg_console].d);
2419
2420         release_console_sem();
2421 }
2422
2423 int set_console(int nr)
2424 {
2425         struct vc_data *vc = vc_cons[fg_console].d;
2426
2427         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2428                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2429
2430                 /*
2431                  * Console switch will fail in console_callback() or
2432                  * change_console() so there is no point scheduling
2433                  * the callback
2434                  *
2435                  * Existing set_console() users don't check the return
2436                  * value so this shouldn't break anything
2437                  */
2438                 return -EINVAL;
2439         }
2440
2441         want_console = nr;
2442         schedule_console_callback();
2443
2444         return 0;
2445 }
2446
2447 struct tty_driver *console_driver;
2448
2449 #ifdef CONFIG_VT_CONSOLE
2450
2451 /*
2452  *      Console on virtual terminal
2453  *
2454  * The console must be locked when we get here.
2455  */
2456
2457 static void vt_console_print(struct console *co, const char *b, unsigned count)
2458 {
2459         struct vc_data *vc = vc_cons[fg_console].d;
2460         unsigned char c;
2461         static DEFINE_SPINLOCK(printing_lock);
2462         const ushort *start;
2463         ushort cnt = 0;
2464         ushort myx;
2465
2466         /* console busy or not yet initialized */
2467         if (!printable)
2468                 return;
2469         if (!spin_trylock(&printing_lock))
2470                 return;
2471
2472         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2473                 vc = vc_cons[kmsg_redirect - 1].d;
2474
2475         /* read `x' only after setting currcons properly (otherwise
2476            the `x' macro will read the x of the foreground console). */
2477         myx = vc->vc_x;
2478
2479         if (!vc_cons_allocated(fg_console)) {
2480                 /* impossible */
2481                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2482                 goto quit;
2483         }
2484
2485         if (vc->vc_mode != KD_TEXT)
2486                 goto quit;
2487
2488         /* undraw cursor first */
2489         if (IS_FG(vc))
2490                 hide_cursor(vc);
2491
2492         start = (ushort *)vc->vc_pos;
2493
2494         /* Contrived structure to try to emulate original need_wrap behaviour
2495          * Problems caused when we have need_wrap set on '\n' character */
2496         while (count--) {
2497                 c = *b++;
2498                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2499                         if (cnt > 0) {
2500                                 if (CON_IS_VISIBLE(vc))
2501                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2502                                 vc->vc_x += cnt;
2503                                 if (vc->vc_need_wrap)
2504                                         vc->vc_x--;
2505                                 cnt = 0;
2506                         }
2507                         if (c == 8) {           /* backspace */
2508                                 bs(vc);
2509                                 start = (ushort *)vc->vc_pos;
2510                                 myx = vc->vc_x;
2511                                 continue;
2512                         }
2513                         if (c != 13)
2514                                 lf(vc);
2515                         cr(vc);
2516                         start = (ushort *)vc->vc_pos;
2517                         myx = vc->vc_x;
2518                         if (c == 10 || c == 13)
2519                                 continue;
2520                 }
2521                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2522                 notify_write(vc, c);
2523                 cnt++;
2524                 if (myx == vc->vc_cols - 1) {
2525                         vc->vc_need_wrap = 1;
2526                         continue;
2527                 }
2528                 vc->vc_pos += 2;
2529                 myx++;
2530         }
2531         if (cnt > 0) {
2532                 if (CON_IS_VISIBLE(vc))
2533                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2534                 vc->vc_x += cnt;
2535                 if (vc->vc_x == vc->vc_cols) {
2536                         vc->vc_x--;
2537                         vc->vc_need_wrap = 1;
2538                 }
2539         }
2540         set_cursor(vc);
2541         notify_update(vc);
2542
2543 quit:
2544         spin_unlock(&printing_lock);
2545 }
2546
2547 static struct tty_driver *vt_console_device(struct console *c, int *index)
2548 {
2549         *index = c->index ? c->index-1 : fg_console;
2550         return console_driver;
2551 }
2552
2553 static struct console vt_console_driver = {
2554         .name           = "tty",
2555         .write          = vt_console_print,
2556         .device         = vt_console_device,
2557         .unblank        = unblank_screen,
2558         .flags          = CON_PRINTBUFFER,
2559         .index          = -1,
2560 };
2561 #endif
2562
2563 /*
2564  *      Handling of Linux-specific VC ioctls
2565  */
2566
2567 /*
2568  * Generally a bit racy with respect to console_sem().
2569  *
2570  * There are some functions which don't need it.
2571  *
2572  * There are some functions which can sleep for arbitrary periods
2573  * (paste_selection) but we don't need the lock there anyway.
2574  *
2575  * set_selection has locking, and definitely needs it
2576  */
2577
2578 int tioclinux(struct tty_struct *tty, unsigned long arg)
2579 {
2580         char type, data;
2581         char __user *p = (char __user *)arg;
2582         int lines;
2583         int ret;
2584
2585         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2586                 return -EINVAL;
2587         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2588                 return -EPERM;
2589         if (get_user(type, p))
2590                 return -EFAULT;
2591         ret = 0;
2592
2593         lock_kernel();
2594
2595         switch (type)
2596         {
2597                 case TIOCL_SETSEL:
2598                         acquire_console_sem();
2599                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2600                         release_console_sem();
2601                         break;
2602                 case TIOCL_PASTESEL:
2603                         ret = paste_selection(tty);
2604                         break;
2605                 case TIOCL_UNBLANKSCREEN:
2606                         acquire_console_sem();
2607                         unblank_screen();
2608                         release_console_sem();
2609                         break;
2610                 case TIOCL_SELLOADLUT:
2611                         ret = sel_loadlut(p);
2612                         break;
2613                 case TIOCL_GETSHIFTSTATE:
2614
2615         /*
2616          * Make it possible to react to Shift+Mousebutton.
2617          * Note that 'shift_state' is an undocumented
2618          * kernel-internal variable; programs not closely
2619          * related to the kernel should not use this.
2620          */
2621                         data = shift_state;
2622                         ret = __put_user(data, p);
2623                         break;
2624                 case TIOCL_GETMOUSEREPORTING:
2625                         data = mouse_reporting();
2626                         ret = __put_user(data, p);
2627                         break;
2628                 case TIOCL_SETVESABLANK:
2629                         ret = set_vesa_blanking(p);
2630                         break;
2631                 case TIOCL_GETKMSGREDIRECT:
2632                         data = kmsg_redirect;
2633                         ret = __put_user(data, p);
2634                         break;
2635                 case TIOCL_SETKMSGREDIRECT:
2636                         if (!capable(CAP_SYS_ADMIN)) {
2637                                 ret = -EPERM;
2638                         } else {
2639                                 if (get_user(data, p+1))
2640                                         ret = -EFAULT;
2641                                 else
2642                                         kmsg_redirect = data;
2643                         }
2644                         break;
2645                 case TIOCL_GETFGCONSOLE:
2646                         ret = fg_console;
2647                         break;
2648                 case TIOCL_SCROLLCONSOLE:
2649                         if (get_user(lines, (s32 __user *)(p+4))) {
2650                                 ret = -EFAULT;
2651                         } else {
2652                                 scrollfront(vc_cons[fg_console].d, lines);
2653                                 ret = 0;
2654                         }
2655                         break;
2656                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2657                         acquire_console_sem();
2658                         ignore_poke = 1;
2659                         do_blank_screen(0);
2660                         release_console_sem();
2661                         break;
2662                 case TIOCL_BLANKEDSCREEN:
2663                         ret = console_blanked;
2664                         break;
2665                 default:
2666                         ret = -EINVAL;
2667                         break;
2668         }
2669         unlock_kernel();
2670         return ret;
2671 }
2672
2673 /*
2674  * /dev/ttyN handling
2675  */
2676
2677 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2678 {
2679         int     retval;
2680
2681         retval = do_con_write(tty, buf, count);
2682         con_flush_chars(tty);
2683
2684         return retval;
2685 }
2686
2687 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2688 {
2689         if (in_interrupt())
2690                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2691         return do_con_write(tty, &ch, 1);
2692 }
2693
2694 static int con_write_room(struct tty_struct *tty)
2695 {
2696         if (tty->stopped)
2697                 return 0;
2698         return 4096;            /* No limit, really; we're not buffering */
2699 }
2700
2701 static int con_chars_in_buffer(struct tty_struct *tty)
2702 {
2703         return 0;               /* we're not buffering */
2704 }
2705
2706 /*
2707  * con_throttle and con_unthrottle are only used for
2708  * paste_selection(), which has to stuff in a large number of
2709  * characters...
2710  */
2711 static void con_throttle(struct tty_struct *tty)
2712 {
2713 }
2714
2715 static void con_unthrottle(struct tty_struct *tty)
2716 {
2717         struct vc_data *vc = tty->driver_data;
2718
2719         wake_up_interruptible(&vc->paste_wait);
2720 }
2721
2722 /*
2723  * Turn the Scroll-Lock LED on when the tty is stopped
2724  */
2725 static void con_stop(struct tty_struct *tty)
2726 {
2727         int console_num;
2728         if (!tty)
2729                 return;
2730         console_num = tty->index;
2731         if (!vc_cons_allocated(console_num))
2732                 return;
2733         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2734         set_leds();
2735 }
2736
2737 /*
2738  * Turn the Scroll-Lock LED off when the console is started
2739  */
2740 static void con_start(struct tty_struct *tty)
2741 {
2742         int console_num;
2743         if (!tty)
2744                 return;
2745         console_num = tty->index;
2746         if (!vc_cons_allocated(console_num))
2747                 return;
2748         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2749         set_leds();
2750 }
2751
2752 static void con_flush_chars(struct tty_struct *tty)
2753 {
2754         struct vc_data *vc;
2755
2756         if (in_interrupt())     /* from flush_to_ldisc */
2757                 return;
2758
2759         /* if we race with con_close(), vt may be null */
2760         acquire_console_sem();
2761         vc = tty->driver_data;
2762         if (vc)
2763                 set_cursor(vc);
2764         release_console_sem();
2765 }
2766
2767 /*
2768  * Allocate the console screen memory.
2769  */
2770 static int con_open(struct tty_struct *tty, struct file *filp)
2771 {
2772         unsigned int currcons = tty->index;
2773         int ret = 0;
2774
2775         acquire_console_sem();
2776         if (tty->driver_data == NULL) {
2777                 ret = vc_allocate(currcons);
2778                 if (ret == 0) {
2779                         struct vc_data *vc = vc_cons[currcons].d;
2780                         tty->driver_data = vc;
2781                         vc->vc_tty = tty;
2782
2783                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2784                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2785                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2786                         }
2787                         if (vc->vc_utf)
2788                                 tty->termios->c_iflag |= IUTF8;
2789                         else
2790                                 tty->termios->c_iflag &= ~IUTF8;
2791                         vcs_make_sysfs(tty);
2792                         release_console_sem();
2793                         return ret;
2794                 }
2795         }
2796         release_console_sem();
2797         return ret;
2798 }
2799
2800 /*
2801  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2802  * and taking a ref against the tty while we're in the process of forgetting
2803  * about it and cleaning things up.
2804  *
2805  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2806  */
2807 static void con_close(struct tty_struct *tty, struct file *filp)
2808 {
2809         mutex_lock(&tty_mutex);
2810         acquire_console_sem();
2811         if (tty && tty->count == 1) {
2812                 struct vc_data *vc = tty->driver_data;
2813
2814                 if (vc)
2815                         vc->vc_tty = NULL;
2816                 tty->driver_data = NULL;
2817                 vcs_remove_sysfs(tty);
2818                 release_console_sem();
2819                 mutex_unlock(&tty_mutex);
2820                 /*
2821                  * tty_mutex is released, but we still hold BKL, so there is
2822                  * still exclusion against init_dev()
2823                  */
2824                 return;
2825         }
2826         release_console_sem();
2827         mutex_unlock(&tty_mutex);
2828 }
2829
2830 static int default_italic_color    = 2; // green (ASCII)
2831 static int default_underline_color = 3; // cyan (ASCII)
2832 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2833 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2834
2835 static void vc_init(struct vc_data *vc, unsigned int rows,
2836                     unsigned int cols, int do_clear)
2837 {
2838         int j, k ;
2839
2840         vc->vc_cols = cols;
2841         vc->vc_rows = rows;
2842         vc->vc_size_row = cols << 1;
2843         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2844
2845         set_origin(vc);
2846         vc->vc_pos = vc->vc_origin;
2847         reset_vc(vc);
2848         for (j=k=0; j<16; j++) {
2849                 vc->vc_palette[k++] = default_red[j] ;
2850                 vc->vc_palette[k++] = default_grn[j] ;
2851                 vc->vc_palette[k++] = default_blu[j] ;
2852         }
2853         vc->vc_def_color       = 0x07;   /* white */
2854         vc->vc_ulcolor         = default_underline_color;
2855         vc->vc_itcolor         = default_italic_color;
2856         vc->vc_halfcolor       = 0x08;   /* grey */
2857         init_waitqueue_head(&vc->paste_wait);
2858         reset_terminal(vc, do_clear);
2859 }
2860
2861 /*
2862  * This routine initializes console interrupts, and does nothing
2863  * else. If you want the screen to clear, call tty_write with
2864  * the appropriate escape-sequence.
2865  */
2866
2867 static int __init con_init(void)
2868 {
2869         const char *display_desc = NULL;
2870         struct vc_data *vc;
2871         unsigned int currcons = 0, i;
2872
2873         acquire_console_sem();
2874
2875         if (conswitchp)
2876                 display_desc = conswitchp->con_startup();
2877         if (!display_desc) {
2878                 fg_console = 0;
2879                 release_console_sem();
2880                 return 0;
2881         }
2882
2883         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2884                 struct con_driver *con_driver = &registered_con_driver[i];
2885
2886                 if (con_driver->con == NULL) {
2887                         con_driver->con = conswitchp;
2888                         con_driver->desc = display_desc;
2889                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2890                         con_driver->first = 0;
2891                         con_driver->last = MAX_NR_CONSOLES - 1;
2892                         break;
2893                 }
2894         }
2895
2896         for (i = 0; i < MAX_NR_CONSOLES; i++)
2897                 con_driver_map[i] = conswitchp;
2898
2899         if (blankinterval) {
2900                 blank_state = blank_normal_wait;
2901                 mod_timer(&console_timer, jiffies + blankinterval);
2902         }
2903
2904         /*
2905          * kmalloc is not running yet - we use the bootmem allocator.
2906          */
2907         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2908                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2909                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2910                 visual_init(vc, currcons, 1);
2911                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2912                 vc->vc_kmalloced = 0;
2913                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2914                         currcons || !vc->vc_sw->con_save_screen);
2915         }
2916         currcons = fg_console = 0;
2917         master_display_fg = vc = vc_cons[currcons].d;
2918         set_origin(vc);
2919         save_screen(vc);
2920         gotoxy(vc, vc->vc_x, vc->vc_y);
2921         csi_J(vc, 0);
2922         update_screen(vc);
2923         printk("Console: %s %s %dx%d",
2924                 vc->vc_can_do_color ? "colour" : "mono",
2925                 display_desc, vc->vc_cols, vc->vc_rows);
2926         printable = 1;
2927         printk("\n");
2928
2929         release_console_sem();
2930
2931 #ifdef CONFIG_VT_CONSOLE
2932         register_console(&vt_console_driver);
2933 #endif
2934         return 0;
2935 }
2936 console_initcall(con_init);
2937
2938 static const struct tty_operations con_ops = {
2939         .open = con_open,
2940         .close = con_close,
2941         .write = con_write,
2942         .write_room = con_write_room,
2943         .put_char = con_put_char,
2944         .flush_chars = con_flush_chars,
2945         .chars_in_buffer = con_chars_in_buffer,
2946         .ioctl = vt_ioctl,
2947         .stop = con_stop,
2948         .start = con_start,
2949         .throttle = con_throttle,
2950         .unthrottle = con_unthrottle,
2951         .resize = vt_resize,
2952 };
2953
2954 int __init vty_init(void)
2955 {
2956         vcs_init();
2957
2958         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2959         if (!console_driver)
2960                 panic("Couldn't allocate console driver\n");
2961         console_driver->owner = THIS_MODULE;
2962         console_driver->name = "tty";
2963         console_driver->name_base = 1;
2964         console_driver->major = TTY_MAJOR;
2965         console_driver->minor_start = 1;
2966         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2967         console_driver->init_termios = tty_std_termios;
2968         if (default_utf8)
2969                 console_driver->init_termios.c_iflag |= IUTF8;
2970         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2971         tty_set_operations(console_driver, &con_ops);
2972         if (tty_register_driver(console_driver))
2973                 panic("Couldn't register console driver\n");
2974
2975         kbd_init();
2976         console_map_init();
2977 #ifdef CONFIG_PROM_CONSOLE
2978         prom_con_init();
2979 #endif
2980 #ifdef CONFIG_MDA_CONSOLE
2981         mda_console_init();
2982 #endif
2983         return 0;
2984 }
2985
2986 #ifndef VT_SINGLE_DRIVER
2987 #include <linux/device.h>
2988
2989 static struct class *vtconsole_class;
2990
2991 static int bind_con_driver(const struct consw *csw, int first, int last,
2992                            int deflt)
2993 {
2994         struct module *owner = csw->owner;
2995         const char *desc = NULL;
2996         struct con_driver *con_driver;
2997         int i, j = -1, k = -1, retval = -ENODEV;
2998
2999         if (!try_module_get(owner))
3000                 return -ENODEV;
3001
3002         acquire_console_sem();
3003
3004         /* check if driver is registered */
3005         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3006                 con_driver = &registered_con_driver[i];
3007
3008                 if (con_driver->con == csw) {
3009                         desc = con_driver->desc;
3010                         retval = 0;
3011                         break;
3012                 }
3013         }
3014
3015         if (retval)
3016                 goto err;
3017
3018         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3019                 csw->con_startup();
3020                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3021         }
3022
3023         if (deflt) {
3024                 if (conswitchp)
3025                         module_put(conswitchp->owner);
3026
3027                 __module_get(owner);
3028                 conswitchp = csw;
3029         }
3030
3031         first = max(first, con_driver->first);
3032         last = min(last, con_driver->last);
3033
3034         for (i = first; i <= last; i++) {
3035                 int old_was_color;
3036                 struct vc_data *vc = vc_cons[i].d;
3037
3038                 if (con_driver_map[i])
3039                         module_put(con_driver_map[i]->owner);
3040                 __module_get(owner);
3041                 con_driver_map[i] = csw;
3042
3043                 if (!vc || !vc->vc_sw)
3044                         continue;
3045
3046                 j = i;
3047
3048                 if (CON_IS_VISIBLE(vc)) {
3049                         k = i;
3050                         save_screen(vc);
3051                 }
3052
3053                 old_was_color = vc->vc_can_do_color;
3054                 vc->vc_sw->con_deinit(vc);
3055                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3056                 visual_init(vc, i, 0);
3057                 set_origin(vc);
3058                 update_attr(vc);
3059
3060                 /* If the console changed between mono <-> color, then
3061                  * the attributes in the screenbuf will be wrong.  The
3062                  * following resets all attributes to something sane.
3063                  */
3064                 if (old_was_color != vc->vc_can_do_color)
3065                         clear_buffer_attributes(vc);
3066         }
3067
3068         printk("Console: switching ");
3069         if (!deflt)
3070                 printk("consoles %d-%d ", first+1, last+1);
3071         if (j >= 0) {
3072                 struct vc_data *vc = vc_cons[j].d;
3073
3074                 printk("to %s %s %dx%d\n",
3075                        vc->vc_can_do_color ? "colour" : "mono",
3076                        desc, vc->vc_cols, vc->vc_rows);
3077
3078                 if (k >= 0) {
3079                         vc = vc_cons[k].d;
3080                         update_screen(vc);
3081                 }
3082         } else
3083                 printk("to %s\n", desc);
3084
3085         retval = 0;
3086 err:
3087         release_console_sem();
3088         module_put(owner);
3089         return retval;
3090 };
3091
3092 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3093 static int con_is_graphics(const struct consw *csw, int first, int last)
3094 {
3095         int i, retval = 0;
3096
3097         for (i = first; i <= last; i++) {
3098                 struct vc_data *vc = vc_cons[i].d;
3099
3100                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3101                         retval = 1;
3102                         break;
3103                 }
3104         }
3105
3106         return retval;
3107 }
3108
3109 /**
3110  * unbind_con_driver - unbind a console driver
3111  * @csw: pointer to console driver to unregister
3112  * @first: first in range of consoles that @csw should be unbound from
3113  * @last: last in range of consoles that @csw should be unbound from
3114  * @deflt: should next bound console driver be default after @csw is unbound?
3115  *
3116  * To unbind a driver from all possible consoles, pass 0 as @first and
3117  * %MAX_NR_CONSOLES as @last.
3118  *
3119  * @deflt controls whether the console that ends up replacing @csw should be
3120  * the default console.
3121  *
3122  * RETURNS:
3123  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3124  * or 0 on success.
3125  */
3126 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3127 {
3128         struct module *owner = csw->owner;
3129         const struct consw *defcsw = NULL;
3130         struct con_driver *con_driver = NULL, *con_back = NULL;
3131         int i, retval = -ENODEV;
3132
3133         if (!try_module_get(owner))
3134                 return -ENODEV;
3135
3136         acquire_console_sem();
3137
3138         /* check if driver is registered and if it is unbindable */
3139         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3140                 con_driver = &registered_con_driver[i];
3141
3142                 if (con_driver->con == csw &&
3143                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3144                         retval = 0;
3145                         break;
3146                 }
3147         }
3148
3149         if (retval) {
3150                 release_console_sem();
3151                 goto err;
3152         }
3153
3154         retval = -ENODEV;
3155
3156         /* check if backup driver exists */
3157         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3158                 con_back = &registered_con_driver[i];
3159
3160                 if (con_back->con &&
3161                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3162                         defcsw = con_back->con;
3163                         retval = 0;
3164                         break;
3165                 }
3166         }
3167
3168         if (retval) {
3169                 release_console_sem();
3170                 goto err;
3171         }
3172
3173         if (!con_is_bound(csw)) {
3174                 release_console_sem();
3175                 goto err;
3176         }
3177
3178         first = max(first, con_driver->first);
3179         last = min(last, con_driver->last);
3180
3181         for (i = first; i <= last; i++) {
3182                 if (con_driver_map[i] == csw) {
3183                         module_put(csw->owner);
3184                         con_driver_map[i] = NULL;
3185                 }
3186         }
3187
3188         if (!con_is_bound(defcsw)) {
3189                 const struct consw *defconsw = conswitchp;
3190
3191                 defcsw->con_startup();
3192                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3193                 /*
3194                  * vgacon may change the default driver to point
3195                  * to dummycon, we restore it here...
3196                  */
3197                 conswitchp = defconsw;
3198         }
3199
3200         if (!con_is_bound(csw))
3201                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3202
3203         release_console_sem();
3204         /* ignore return value, binding should not fail */
3205         bind_con_driver(defcsw, first, last, deflt);
3206 err:
3207         module_put(owner);
3208         return retval;
3209
3210 }
3211 EXPORT_SYMBOL(unbind_con_driver);
3212
3213 static int vt_bind(struct con_driver *con)
3214 {
3215         const struct consw *defcsw = NULL, *csw = NULL;
3216         int i, more = 1, first = -1, last = -1, deflt = 0;
3217
3218         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3219             con_is_graphics(con->con, con->first, con->last))
3220                 goto err;
3221
3222         csw = con->con;
3223
3224         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3225                 struct con_driver *con = &registered_con_driver[i];
3226
3227                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3228                         defcsw = con->con;
3229                         break;
3230                 }
3231         }
3232
3233         if (!defcsw)
3234                 goto err;
3235
3236         while (more) {
3237                 more = 0;
3238
3239                 for (i = con->first; i <= con->last; i++) {
3240                         if (con_driver_map[i] == defcsw) {
3241                                 if (first == -1)
3242                                         first = i;
3243                                 last = i;
3244                                 more = 1;
3245                         } else if (first != -1)
3246                                 break;
3247                 }
3248
3249                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3250                         deflt = 1;
3251
3252                 if (first != -1)
3253                         bind_con_driver(csw, first, last, deflt);
3254
3255                 first = -1;
3256                 last = -1;
3257                 deflt = 0;
3258         }
3259
3260 err:
3261         return 0;
3262 }
3263
3264 static int vt_unbind(struct con_driver *con)
3265 {
3266         const struct consw *csw = NULL;
3267         int i, more = 1, first = -1, last = -1, deflt = 0;
3268
3269         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3270             con_is_graphics(con->con, con->first, con->last))
3271                 goto err;
3272
3273         csw = con->con;
3274
3275         while (more) {
3276                 more = 0;
3277
3278                 for (i = con->first; i <= con->last; i++) {
3279                         if (con_driver_map[i] == csw) {
3280                                 if (first == -1)
3281                                         first = i;
3282                                 last = i;
3283                                 more = 1;
3284                         } else if (first != -1)
3285                                 break;
3286                 }
3287
3288                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3289                         deflt = 1;
3290
3291                 if (first != -1)
3292                         unbind_con_driver(csw, first, last, deflt);
3293
3294                 first = -1;
3295                 last = -1;
3296                 deflt = 0;
3297         }
3298
3299 err:
3300         return 0;
3301 }
3302 #else
3303 static inline int vt_bind(struct con_driver *con)
3304 {
3305         return 0;
3306 }
3307 static inline int vt_unbind(struct con_driver *con)
3308 {
3309         return 0;
3310 }
3311 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3312
3313 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3314                           const char *buf, size_t count)
3315 {
3316         struct con_driver *con = dev_get_drvdata(dev);
3317         int bind = simple_strtoul(buf, NULL, 0);
3318
3319         if (bind)
3320                 vt_bind(con);
3321         else
3322                 vt_unbind(con);
3323
3324         return count;
3325 }
3326
3327 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3328                          char *buf)
3329 {
3330         struct con_driver *con = dev_get_drvdata(dev);
3331         int bind = con_is_bound(con->con);
3332
3333         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3334 }
3335
3336 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3337                          char *buf)
3338 {
3339         struct con_driver *con = dev_get_drvdata(dev);
3340
3341         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3342                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3343                          con->desc);
3344
3345 }
3346
3347 static struct device_attribute device_attrs[] = {
3348         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3349         __ATTR(name, S_IRUGO, show_name, NULL),
3350 };
3351
3352 static int vtconsole_init_device(struct con_driver *con)
3353 {
3354         int i;
3355         int error = 0;
3356
3357         con->flag |= CON_DRIVER_FLAG_ATTR;
3358         dev_set_drvdata(con->dev, con);
3359         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3360                 error = device_create_file(con->dev, &device_attrs[i]);
3361                 if (error)
3362                         break;
3363         }
3364
3365         if (error) {
3366                 while (--i >= 0)
3367                         device_remove_file(con->dev, &device_attrs[i]);
3368                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3369         }
3370
3371         return error;
3372 }
3373
3374 static void vtconsole_deinit_device(struct con_driver *con)
3375 {
3376         int i;
3377
3378         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3379                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3380                         device_remove_file(con->dev, &device_attrs[i]);
3381                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3382         }
3383 }
3384
3385 /**
3386  * con_is_bound - checks if driver is bound to the console
3387  * @csw: console driver
3388  *
3389  * RETURNS: zero if unbound, nonzero if bound
3390  *
3391  * Drivers can call this and if zero, they should release
3392  * all resources allocated on con_startup()
3393  */
3394 int con_is_bound(const struct consw *csw)
3395 {
3396         int i, bound = 0;
3397
3398         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3399                 if (con_driver_map[i] == csw) {
3400                         bound = 1;
3401                         break;
3402                 }
3403         }
3404
3405         return bound;
3406 }
3407 EXPORT_SYMBOL(con_is_bound);
3408
3409 /**
3410  * register_con_driver - register console driver to console layer
3411  * @csw: console driver
3412  * @first: the first console to take over, minimum value is 0
3413  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3414  *
3415  * DESCRIPTION: This function registers a console driver which can later
3416  * bind to a range of consoles specified by @first and @last. It will
3417  * also initialize the console driver by calling con_startup().
3418  */
3419 int register_con_driver(const struct consw *csw, int first, int last)
3420 {
3421         struct module *owner = csw->owner;
3422         struct con_driver *con_driver;
3423         const char *desc;
3424         int i, retval = 0;
3425
3426         if (!try_module_get(owner))
3427                 return -ENODEV;
3428
3429         acquire_console_sem();
3430
3431         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3432                 con_driver = &registered_con_driver[i];
3433
3434                 /* already registered */
3435                 if (con_driver->con == csw)
3436                         retval = -EINVAL;
3437         }
3438
3439         if (retval)
3440                 goto err;
3441
3442         desc = csw->con_startup();
3443
3444         if (!desc)
3445                 goto err;
3446
3447         retval = -EINVAL;
3448
3449         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3450                 con_driver = &registered_con_driver[i];
3451
3452                 if (con_driver->con == NULL) {
3453                         con_driver->con = csw;
3454                         con_driver->desc = desc;
3455                         con_driver->node = i;
3456                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3457                                            CON_DRIVER_FLAG_INIT;
3458                         con_driver->first = first;
3459                         con_driver->last = last;
3460                         retval = 0;
3461                         break;
3462                 }
3463         }
3464
3465         if (retval)
3466                 goto err;
3467
3468         con_driver->dev = device_create_drvdata(vtconsole_class, NULL,
3469                                                 MKDEV(0, con_driver->node),
3470                                                 NULL, "vtcon%i",
3471                                                 con_driver->node);
3472
3473         if (IS_ERR(con_driver->dev)) {
3474                 printk(KERN_WARNING "Unable to create device for %s; "
3475                        "errno = %ld\n", con_driver->desc,
3476                        PTR_ERR(con_driver->dev));
3477                 con_driver->dev = NULL;
3478         } else {
3479                 vtconsole_init_device(con_driver);
3480         }
3481
3482 err:
3483         release_console_sem();
3484         module_put(owner);
3485         return retval;
3486 }
3487 EXPORT_SYMBOL(register_con_driver);
3488
3489 /**
3490  * unregister_con_driver - unregister console driver from console layer
3491  * @csw: console driver
3492  *
3493  * DESCRIPTION: All drivers that registers to the console layer must
3494  * call this function upon exit, or if the console driver is in a state
3495  * where it won't be able to handle console services, such as the
3496  * framebuffer console without loaded framebuffer drivers.
3497  *
3498  * The driver must unbind first prior to unregistration.
3499  */
3500 int unregister_con_driver(const struct consw *csw)
3501 {
3502         int i, retval = -ENODEV;
3503
3504         acquire_console_sem();
3505
3506         /* cannot unregister a bound driver */
3507         if (con_is_bound(csw))
3508                 goto err;
3509
3510         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3511                 struct con_driver *con_driver = &registered_con_driver[i];
3512
3513                 if (con_driver->con == csw &&
3514                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3515                         vtconsole_deinit_device(con_driver);
3516                         device_destroy(vtconsole_class,
3517                                        MKDEV(0, con_driver->node));
3518                         con_driver->con = NULL;
3519                         con_driver->desc = NULL;
3520                         con_driver->dev = NULL;
3521                         con_driver->node = 0;
3522                         con_driver->flag = 0;
3523                         con_driver->first = 0;
3524                         con_driver->last = 0;
3525                         retval = 0;
3526                         break;
3527                 }
3528         }
3529 err:
3530         release_console_sem();
3531         return retval;
3532 }
3533 EXPORT_SYMBOL(unregister_con_driver);
3534
3535 /*
3536  *      If we support more console drivers, this function is used
3537  *      when a driver wants to take over some existing consoles
3538  *      and become default driver for newly opened ones.
3539  *
3540  *      take_over_console is basically a register followed by unbind
3541  */
3542 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3543 {
3544         int err;
3545
3546         err = register_con_driver(csw, first, last);
3547
3548         if (!err)
3549                 bind_con_driver(csw, first, last, deflt);
3550
3551         return err;
3552 }
3553
3554 /*
3555  * give_up_console is a wrapper to unregister_con_driver. It will only
3556  * work if driver is fully unbound.
3557  */
3558 void give_up_console(const struct consw *csw)
3559 {
3560         unregister_con_driver(csw);
3561 }
3562
3563 static int __init vtconsole_class_init(void)
3564 {
3565         int i;
3566
3567         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3568         if (IS_ERR(vtconsole_class)) {
3569                 printk(KERN_WARNING "Unable to create vt console class; "
3570                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3571                 vtconsole_class = NULL;
3572         }
3573
3574         /* Add system drivers to sysfs */
3575         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3576                 struct con_driver *con = &registered_con_driver[i];
3577
3578                 if (con->con && !con->dev) {
3579                         con->dev = device_create_drvdata(vtconsole_class, NULL,
3580                                                          MKDEV(0, con->node),
3581                                                          NULL, "vtcon%i",
3582                                                          con->node);
3583
3584                         if (IS_ERR(con->dev)) {
3585                                 printk(KERN_WARNING "Unable to create "
3586                                        "device for %s; errno = %ld\n",
3587                                        con->desc, PTR_ERR(con->dev));
3588                                 con->dev = NULL;
3589                         } else {
3590                                 vtconsole_init_device(con);
3591                         }
3592                 }
3593         }
3594
3595         return 0;
3596 }
3597 postcore_initcall(vtconsole_class_init);
3598
3599 #endif
3600
3601 /*
3602  *      Screen blanking
3603  */
3604
3605 static int set_vesa_blanking(char __user *p)
3606 {
3607         unsigned int mode;
3608
3609         if (get_user(mode, p + 1))
3610                 return -EFAULT;
3611
3612         vesa_blank_mode = (mode < 4) ? mode : 0;
3613         return 0;
3614 }
3615
3616 void do_blank_screen(int entering_gfx)
3617 {
3618         struct vc_data *vc = vc_cons[fg_console].d;
3619         int i;
3620
3621         WARN_CONSOLE_UNLOCKED();
3622
3623         if (console_blanked) {
3624                 if (blank_state == blank_vesa_wait) {
3625                         blank_state = blank_off;
3626                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3627                 }
3628                 return;
3629         }
3630
3631         /* entering graphics mode? */
3632         if (entering_gfx) {
3633                 hide_cursor(vc);
3634                 save_screen(vc);
3635                 vc->vc_sw->con_blank(vc, -1, 1);
3636                 console_blanked = fg_console + 1;
3637                 blank_state = blank_off;
3638                 set_origin(vc);
3639                 return;
3640         }
3641
3642         if (blank_state != blank_normal_wait)
3643                 return;
3644         blank_state = blank_off;
3645
3646         /* don't blank graphics */
3647         if (vc->vc_mode != KD_TEXT) {
3648                 console_blanked = fg_console + 1;
3649                 return;
3650         }
3651
3652         hide_cursor(vc);
3653         del_timer_sync(&console_timer);
3654         blank_timer_expired = 0;
3655
3656         save_screen(vc);
3657         /* In case we need to reset origin, blanking hook returns 1 */
3658         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3659         console_blanked = fg_console + 1;
3660         if (i)
3661                 set_origin(vc);
3662
3663         if (console_blank_hook && console_blank_hook(1))
3664                 return;
3665
3666         if (vesa_off_interval && vesa_blank_mode) {
3667                 blank_state = blank_vesa_wait;
3668                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3669         }
3670 }
3671 EXPORT_SYMBOL(do_blank_screen);
3672
3673 /*
3674  * Called by timer as well as from vt_console_driver
3675  */
3676 void do_unblank_screen(int leaving_gfx)
3677 {
3678         struct vc_data *vc;
3679
3680         /* This should now always be called from a "sane" (read: can schedule)
3681          * context for the sake of the low level drivers, except in the special
3682          * case of oops_in_progress
3683          */
3684         if (!oops_in_progress)
3685                 might_sleep();
3686
3687         WARN_CONSOLE_UNLOCKED();
3688
3689         ignore_poke = 0;
3690         if (!console_blanked)
3691                 return;
3692         if (!vc_cons_allocated(fg_console)) {
3693                 /* impossible */
3694                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3695                 return;
3696         }
3697         vc = vc_cons[fg_console].d;
3698         if (vc->vc_mode != KD_TEXT)
3699                 return; /* but leave console_blanked != 0 */
3700
3701         if (blankinterval) {
3702                 mod_timer(&console_timer, jiffies + blankinterval);
3703                 blank_state = blank_normal_wait;
3704         }
3705
3706         console_blanked = 0;
3707         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3708                 /* Low-level driver cannot restore -> do it ourselves */
3709                 update_screen(vc);
3710         if (console_blank_hook)
3711                 console_blank_hook(0);
3712         set_palette(vc);
3713         set_cursor(vc);
3714 }
3715 EXPORT_SYMBOL(do_unblank_screen);
3716
3717 /*
3718  * This is called by the outside world to cause a forced unblank, mostly for
3719  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3720  * call it with 1 as an argument and so force a mode restore... that may kill
3721  * X or at least garbage the screen but would also make the Oops visible...
3722  */
3723 void unblank_screen(void)
3724 {
3725         do_unblank_screen(0);
3726 }
3727
3728 /*
3729  * We defer the timer blanking to work queue so it can take the console mutex
3730  * (console operations can still happen at irq time, but only from printk which
3731  * has the console mutex. Not perfect yet, but better than no locking
3732  */
3733 static void blank_screen_t(unsigned long dummy)
3734 {
3735         if (unlikely(!keventd_up())) {
3736                 mod_timer(&console_timer, jiffies + blankinterval);
3737                 return;
3738         }
3739         blank_timer_expired = 1;
3740         schedule_work(&console_work);
3741 }
3742
3743 void poke_blanked_console(void)
3744 {
3745         WARN_CONSOLE_UNLOCKED();
3746
3747         /* Add this so we quickly catch whoever might call us in a non
3748          * safe context. Nowadays, unblank_screen() isn't to be called in
3749          * atomic contexts and is allowed to schedule (with the special case
3750          * of oops_in_progress, but that isn't of any concern for this
3751          * function. --BenH.
3752          */
3753         might_sleep();
3754
3755         /* This isn't perfectly race free, but a race here would be mostly harmless,
3756          * at worse, we'll do a spurrious blank and it's unlikely
3757          */
3758         del_timer(&console_timer);
3759         blank_timer_expired = 0;
3760
3761         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3762                 return;
3763         if (console_blanked)
3764                 unblank_screen();
3765         else if (blankinterval) {
3766                 mod_timer(&console_timer, jiffies + blankinterval);
3767                 blank_state = blank_normal_wait;
3768         }
3769 }
3770
3771 /*
3772  *      Palettes
3773  */
3774
3775 static void set_palette(struct vc_data *vc)
3776 {
3777         WARN_CONSOLE_UNLOCKED();
3778
3779         if (vc->vc_mode != KD_GRAPHICS)
3780                 vc->vc_sw->con_set_palette(vc, color_table);
3781 }
3782
3783 static int set_get_cmap(unsigned char __user *arg, int set)
3784 {
3785     int i, j, k;
3786
3787     WARN_CONSOLE_UNLOCKED();
3788
3789     for (i = 0; i < 16; i++)
3790         if (set) {
3791             get_user(default_red[i], arg++);
3792             get_user(default_grn[i], arg++);
3793             get_user(default_blu[i], arg++);
3794         } else {
3795             put_user(default_red[i], arg++);
3796             put_user(default_grn[i], arg++);
3797             put_user(default_blu[i], arg++);
3798         }
3799     if (set) {
3800         for (i = 0; i < MAX_NR_CONSOLES; i++)
3801             if (vc_cons_allocated(i)) {
3802                 for (j = k = 0; j < 16; j++) {
3803                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3804                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3805                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3806                 }
3807                 set_palette(vc_cons[i].d);
3808             }
3809     }
3810     return 0;
3811 }
3812
3813 /*
3814  * Load palette into the DAC registers. arg points to a colour
3815  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3816  */
3817
3818 int con_set_cmap(unsigned char __user *arg)
3819 {
3820         int rc;
3821
3822         acquire_console_sem();
3823         rc = set_get_cmap (arg,1);
3824         release_console_sem();
3825
3826         return rc;
3827 }
3828
3829 int con_get_cmap(unsigned char __user *arg)
3830 {
3831         int rc;
3832
3833         acquire_console_sem();
3834         rc = set_get_cmap (arg,0);
3835         release_console_sem();
3836
3837         return rc;
3838 }
3839
3840 void reset_palette(struct vc_data *vc)
3841 {
3842         int j, k;
3843         for (j=k=0; j<16; j++) {
3844                 vc->vc_palette[k++] = default_red[j];
3845                 vc->vc_palette[k++] = default_grn[j];
3846                 vc->vc_palette[k++] = default_blu[j];
3847         }
3848         set_palette(vc);
3849 }
3850
3851 /*
3852  *  Font switching
3853  *
3854  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3855  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3856  *  depending on width) reserved for each character which is kinda wasty, but
3857  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3858  *  is upto the actual low-level console-driver convert data into its favorite
3859  *  format (maybe we should add a `fontoffset' field to the `display'
3860  *  structure so we won't have to convert the fontdata all the time.
3861  *  /Jes
3862  */
3863
3864 #define max_font_size 65536
3865
3866 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3867 {
3868         struct console_font font;
3869         int rc = -EINVAL;
3870         int c;
3871
3872         if (vc->vc_mode != KD_TEXT)
3873                 return -EINVAL;
3874
3875         if (op->data) {
3876                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3877                 if (!font.data)
3878                         return -ENOMEM;
3879         } else
3880                 font.data = NULL;
3881
3882         acquire_console_sem();
3883         if (vc->vc_sw->con_font_get)
3884                 rc = vc->vc_sw->con_font_get(vc, &font);
3885         else
3886                 rc = -ENOSYS;
3887         release_console_sem();
3888
3889         if (rc)
3890                 goto out;
3891
3892         c = (font.width+7)/8 * 32 * font.charcount;
3893
3894         if (op->data && font.charcount > op->charcount)
3895                 rc = -ENOSPC;
3896         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3897                 if (font.width > op->width || font.height > op->height)
3898                         rc = -ENOSPC;
3899         } else {
3900                 if (font.width != 8)
3901                         rc = -EIO;
3902                 else if ((op->height && font.height > op->height) ||
3903                          font.height > 32)
3904                         rc = -ENOSPC;
3905         }
3906         if (rc)
3907                 goto out;
3908
3909         op->height = font.height;
3910         op->width = font.width;
3911         op->charcount = font.charcount;
3912
3913         if (op->data && copy_to_user(op->data, font.data, c))
3914                 rc = -EFAULT;
3915
3916 out:
3917         kfree(font.data);
3918         return rc;
3919 }
3920
3921 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3922 {
3923         struct console_font font;
3924         int rc = -EINVAL;
3925         int size;
3926
3927         if (vc->vc_mode != KD_TEXT)
3928                 return -EINVAL;
3929         if (!op->data)
3930                 return -EINVAL;
3931         if (op->charcount > 512)
3932                 return -EINVAL;
3933         if (!op->height) {              /* Need to guess font height [compat] */
3934                 int h, i;
3935                 u8 __user *charmap = op->data;
3936                 u8 tmp;
3937
3938                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3939                    so that we can get rid of this soon */
3940                 if (!(op->flags & KD_FONT_FLAG_OLD))
3941                         return -EINVAL;
3942                 for (h = 32; h > 0; h--)
3943                         for (i = 0; i < op->charcount; i++) {
3944                                 if (get_user(tmp, &charmap[32*i+h-1]))
3945                                         return -EFAULT;
3946                                 if (tmp)
3947                                         goto nonzero;
3948                         }
3949                 return -EINVAL;
3950         nonzero:
3951                 op->height = h;
3952         }
3953         if (op->width <= 0 || op->width > 32 || op->height > 32)
3954                 return -EINVAL;
3955         size = (op->width+7)/8 * 32 * op->charcount;
3956         if (size > max_font_size)
3957                 return -ENOSPC;
3958         font.charcount = op->charcount;
3959         font.height = op->height;
3960         font.width = op->width;
3961         font.data = kmalloc(size, GFP_KERNEL);
3962         if (!font.data)
3963                 return -ENOMEM;
3964         if (copy_from_user(font.data, op->data, size)) {
3965                 kfree(font.data);
3966                 return -EFAULT;
3967         }
3968         acquire_console_sem();
3969         if (vc->vc_sw->con_font_set)
3970                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3971         else
3972                 rc = -ENOSYS;
3973         release_console_sem();
3974         kfree(font.data);
3975         return rc;
3976 }
3977
3978 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3979 {
3980         struct console_font font = {.width = op->width, .height = op->height};
3981         char name[MAX_FONT_NAME];
3982         char *s = name;
3983         int rc;
3984
3985         if (vc->vc_mode != KD_TEXT)
3986                 return -EINVAL;
3987
3988         if (!op->data)
3989                 s = NULL;
3990         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3991                 return -EFAULT;
3992         else
3993                 name[MAX_FONT_NAME - 1] = 0;
3994
3995         acquire_console_sem();
3996         if (vc->vc_sw->con_font_default)
3997                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3998         else
3999                 rc = -ENOSYS;
4000         release_console_sem();
4001         if (!rc) {
4002                 op->width = font.width;
4003                 op->height = font.height;
4004         }
4005         return rc;
4006 }
4007
4008 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4009 {
4010         int con = op->height;
4011         int rc;
4012
4013         if (vc->vc_mode != KD_TEXT)
4014                 return -EINVAL;
4015
4016         acquire_console_sem();
4017         if (!vc->vc_sw->con_font_copy)
4018                 rc = -ENOSYS;
4019         else if (con < 0 || !vc_cons_allocated(con))
4020                 rc = -ENOTTY;
4021         else if (con == vc->vc_num)     /* nothing to do */
4022                 rc = 0;
4023         else
4024                 rc = vc->vc_sw->con_font_copy(vc, con);
4025         release_console_sem();
4026         return rc;
4027 }
4028
4029 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4030 {
4031         switch (op->op) {
4032         case KD_FONT_OP_SET:
4033                 return con_font_set(vc, op);
4034         case KD_FONT_OP_GET:
4035                 return con_font_get(vc, op);
4036         case KD_FONT_OP_SET_DEFAULT:
4037                 return con_font_default(vc, op);
4038         case KD_FONT_OP_COPY:
4039                 return con_font_copy(vc, op);
4040         }
4041         return -ENOSYS;
4042 }
4043
4044 /*
4045  *      Interface exported to selection and vcs.
4046  */
4047
4048 /* used by selection */
4049 u16 screen_glyph(struct vc_data *vc, int offset)
4050 {
4051         u16 w = scr_readw(screenpos(vc, offset, 1));
4052         u16 c = w & 0xff;
4053
4054         if (w & vc->vc_hi_font_mask)
4055                 c |= 0x100;
4056         return c;
4057 }
4058 EXPORT_SYMBOL_GPL(screen_glyph);
4059
4060 /* used by vcs - note the word offset */
4061 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4062 {
4063         return screenpos(vc, 2 * w_offset, viewed);
4064 }
4065
4066 void getconsxy(struct vc_data *vc, unsigned char *p)
4067 {
4068         p[0] = vc->vc_x;
4069         p[1] = vc->vc_y;
4070 }
4071
4072 void putconsxy(struct vc_data *vc, unsigned char *p)
4073 {
4074         hide_cursor(vc);
4075         gotoxy(vc, p[0], p[1]);
4076         set_cursor(vc);
4077 }
4078
4079 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4080 {
4081         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4082                 return softcursor_original;
4083         return scr_readw(org);
4084 }
4085
4086 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4087 {
4088         scr_writew(val, org);
4089         if ((unsigned long)org == vc->vc_pos) {
4090                 softcursor_original = -1;
4091                 add_softcursor(vc);
4092         }
4093 }
4094
4095 /*
4096  *      Visible symbols for modules
4097  */
4098
4099 EXPORT_SYMBOL(color_table);
4100 EXPORT_SYMBOL(default_red);
4101 EXPORT_SYMBOL(default_grn);
4102 EXPORT_SYMBOL(default_blu);
4103 EXPORT_SYMBOL(update_region);
4104 EXPORT_SYMBOL(redraw_screen);
4105 EXPORT_SYMBOL(vc_resize);
4106 EXPORT_SYMBOL(fg_console);
4107 EXPORT_SYMBOL(console_blank_hook);
4108 EXPORT_SYMBOL(console_blanked);
4109 EXPORT_SYMBOL(vc_cons);
4110 #ifndef VT_SINGLE_DRIVER
4111 EXPORT_SYMBOL(take_over_console);
4112 EXPORT_SYMBOL(give_up_console);
4113 #endif