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   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton
  63  *
  64  * Removed console_lock, enabled interrupts across all console operations
  65  * 13 March 2001, Andrew Morton
  66  *
  67  * Fixed UTF-8 mode so alternate charset modes always work according
  68  * to control sequences interpreted in do_con_trol function
  69  * preserving backward VT100 semigraphics compatibility,
  70  * malformed UTF sequences represented as sequences of replacement glyphs,
  71  * original codes or '?' as a last resort if replacement glyph is undefined
  72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  73  */
  74
  75 #include <linux/module.h>
  76 #include <linux/types.h>
  77 #include <linux/sched.h>
  78 #include <linux/tty.h>
  79 #include <linux/tty_flip.h>
  80 #include <linux/kernel.h>
  81 #include <linux/string.h>
  82 #include <linux/errno.h>
  83 #include <linux/kd.h>
  84 #include <linux/slab.h>
  85 #include <linux/major.h>
  86 #include <linux/mm.h>
  87 #include <linux/console.h>
  88 #include <linux/init.h>
  89 #include <linux/mutex.h>
  90 #include <linux/vt_kern.h>
  91 #include <linux/selection.h>
  92 #include <linux/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 #include <linux/device.h>
 104 #include <linux/io.h>
 105 #include <asm/system.h>
 106 #include <linux/uaccess.h>
 107
 108 #define MAX_NR_CON_DRIVER 16
 109
 110 #define CON_DRIVER_FLAG_MODULE 1
 111 #define CON_DRIVER_FLAG_INIT   2
 112 #define CON_DRIVER_FLAG_ATTR   4
 113
 114 struct con_driver {
 115         const struct consw *con;
 116         const char *desc;
 117         struct device *dev;
 118         int node;
 119         int first;
 120         int last;
 121         int flag;
 122 };
 123
 124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 125 const struct consw *conswitchp;
 126
 127 /* A bitmap for codes <32. A bit of 1 indicates that the code
 128  * corresponding to that bit number invokes some special action
 129  * (such as cursor movement) and should not be displayed as a
 130  * glyph unless the disp_ctrl mode is explicitly enabled.
 131  */
 132 #define CTRL_ACTION 0x0d00ff81
 133 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 134
 135 /*
 136  * Here is the default bell parameters: 750HZ, 1/8th of a second
 137  */
 138 #define DEFAULT_BELL_PITCH      750
 139 #define DEFAULT_BELL_DURATION   (HZ/8)
 140
 141 struct vc vc_cons [MAX_NR_CONSOLES];
 142
 143 #ifndef VT_SINGLE_DRIVER
 144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 145 #endif
 146
 147 static int con_open(struct tty_struct *, struct file *);
 148 static void vc_init(struct vc_data *vc, unsigned int rows,
 149                     unsigned int cols, int do_clear);
 150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 151 static void save_cur(struct vc_data *vc);
 152 static void reset_terminal(struct vc_data *vc, int do_clear);
 153 static void con_flush_chars(struct tty_struct *tty);
 154 static int set_vesa_blanking(char __user *p);
 155 static void set_cursor(struct vc_data *vc);
 156 static void hide_cursor(struct vc_data *vc);
 157 static void console_callback(struct work_struct *ignored);
 158 static void blank_screen_t(unsigned long dummy);
 159 static void set_palette(struct vc_data *vc);
 160
 161 static int printable;           /* Is console ready for printing? */
 162 int default_utf8 = true;
 163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 164
 165 /*
 166  * ignore_poke: don't unblank the screen when things are typed.  This is
 167  * mainly for the privacy of braille terminal users.
 168  */
 169 static int ignore_poke;
 170
 171 int do_poke_blanked_console;
 172 int console_blanked;
 173
 174 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 175 static int 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 vc_data *vc,
 823                                 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, &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, cols, rows);
 958 }
 959
 960 /**
 961  *      vt_resize               -       resize a VT
 962  *      @tty: tty to resize
 963  *      @ws: winsize attributes
 964  *
 965  *      Resize a virtual terminal. This is called by the tty layer as we
 966  *      register our own handler for resizing. The mutual helper does all
 967  *      the actual work.
 968  *
 969  *      Takes the console sem and the called methods then take the tty
 970  *      termios_mutex and the tty ctrl_lock in that order.
 971  */
 972
 973 int vt_resize(struct tty_struct *tty, struct winsize *ws)
 974 {
 975         struct vc_data *vc = tty->driver_data;
 976         int ret;
 977
 978         acquire_console_sem();
 979         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 980         release_console_sem();
 981         return ret;
 982 }
 983
 984 void vc_deallocate(unsigned int currcons)
 985 {
 986         WARN_CONSOLE_UNLOCKED();
 987
 988         if (vc_cons_allocated(currcons)) {
 989                 struct vc_data *vc = vc_cons[currcons].d;
 990                 struct vt_notifier_param param = { .vc = vc };
 991                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 992                 vc->vc_sw->con_deinit(vc);
 993                 put_pid(vc->vt_pid);
 994                 module_put(vc->vc_sw->owner);
 995                 if (vc->vc_kmalloced)
 996                         kfree(vc->vc_screenbuf);
 997                 if (currcons >= MIN_NR_CONSOLES)
 998                         kfree(vc);
 999                 vc_cons[currcons].d = NULL;
1000         }
1001 }
1002
1003 /*
1004  *      VT102 emulator
1005  */
1006
1007 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1008 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1009 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1010
1011 #define decarm          VC_REPEAT
1012 #define decckm          VC_CKMODE
1013 #define kbdapplic       VC_APPLIC
1014 #define lnm             VC_CRLF
1015
1016 /*
1017  * this is what the terminal answers to a ESC-Z or csi0c query.
1018  */
1019 #define VT100ID "\033[?1;2c"
1020 #define VT102ID "\033[?6c"
1021
1022 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1023                                        8,12,10,14, 9,13,11,15 };
1024
1025 /* the default colour table, for VGA+ colour systems */
1026 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1027     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1028 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1029     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1030 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1031     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1032
1033 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1034 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1035 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1036
1037 /*
1038  * gotoxy() must verify all boundaries, because the arguments
1039  * might also be negative. If the given position is out of
1040  * bounds, the cursor is placed at the nearest margin.
1041  */
1042 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1043 {
1044         int min_y, max_y;
1045
1046         if (new_x < 0)
1047                 vc->vc_x = 0;
1048         else {
1049                 if (new_x >= vc->vc_cols)
1050                         vc->vc_x = vc->vc_cols - 1;
1051                 else
1052                         vc->vc_x = new_x;
1053         }
1054
1055         if (vc->vc_decom) {
1056                 min_y = vc->vc_top;
1057                 max_y = vc->vc_bottom;
1058         } else {
1059                 min_y = 0;
1060                 max_y = vc->vc_rows;
1061         }
1062         if (new_y < min_y)
1063                 vc->vc_y = min_y;
1064         else if (new_y >= max_y)
1065                 vc->vc_y = max_y - 1;
1066         else
1067                 vc->vc_y = new_y;
1068         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1069         vc->vc_need_wrap = 0;
1070 }
1071
1072 /* for absolute user moves, when decom is set */
1073 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1074 {
1075         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1076 }
1077
1078 void scrollback(struct vc_data *vc, int lines)
1079 {
1080         if (!lines)
1081                 lines = vc->vc_rows / 2;
1082         scrolldelta(-lines);
1083 }
1084
1085 void scrollfront(struct vc_data *vc, int lines)
1086 {
1087         if (!lines)
1088                 lines = vc->vc_rows / 2;
1089         scrolldelta(lines);
1090 }
1091
1092 static void lf(struct vc_data *vc)
1093 {
1094         /* don't scroll if above bottom of scrolling region, or
1095          * if below scrolling region
1096          */
1097         if (vc->vc_y + 1 == vc->vc_bottom)
1098                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1099         else if (vc->vc_y < vc->vc_rows - 1) {
1100                 vc->vc_y++;
1101                 vc->vc_pos += vc->vc_size_row;
1102         }
1103         vc->vc_need_wrap = 0;
1104         notify_write(vc, '\n');
1105 }
1106
1107 static void ri(struct vc_data *vc)
1108 {
1109         /* don't scroll if below top of scrolling region, or
1110          * if above scrolling region
1111          */
1112         if (vc->vc_y == vc->vc_top)
1113                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1114         else if (vc->vc_y > 0) {
1115                 vc->vc_y--;
1116                 vc->vc_pos -= vc->vc_size_row;
1117         }
1118         vc->vc_need_wrap = 0;
1119 }
1120
1121 static inline void cr(struct vc_data *vc)
1122 {
1123         vc->vc_pos -= vc->vc_x << 1;
1124         vc->vc_need_wrap = vc->vc_x = 0;
1125         notify_write(vc, '\r');
1126 }
1127
1128 static inline void bs(struct vc_data *vc)
1129 {
1130         if (vc->vc_x) {
1131                 vc->vc_pos -= 2;
1132                 vc->vc_x--;
1133                 vc->vc_need_wrap = 0;
1134                 notify_write(vc, '\b');
1135         }
1136 }
1137
1138 static inline void del(struct vc_data *vc)
1139 {
1140         /* ignored */
1141 }
1142
1143 static void csi_J(struct vc_data *vc, int vpar)
1144 {
1145         unsigned int count;
1146         unsigned short * start;
1147
1148         switch (vpar) {
1149                 case 0: /* erase from cursor to end of display */
1150                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1151                         start = (unsigned short *)vc->vc_pos;
1152                         if (DO_UPDATE(vc)) {
1153                                 /* do in two stages */
1154                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1155                                               vc->vc_cols - vc->vc_x);
1156                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1157                                               vc->vc_rows - vc->vc_y - 1,
1158                                               vc->vc_cols);
1159                         }
1160                         break;
1161                 case 1: /* erase from start to cursor */
1162                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1163                         start = (unsigned short *)vc->vc_origin;
1164                         if (DO_UPDATE(vc)) {
1165                                 /* do in two stages */
1166                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1167                                               vc->vc_cols);
1168                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1169                                               vc->vc_x + 1);
1170                         }
1171                         break;
1172                 case 2: /* erase whole display */
1173                         count = vc->vc_cols * vc->vc_rows;
1174                         start = (unsigned short *)vc->vc_origin;
1175                         if (DO_UPDATE(vc))
1176                                 vc->vc_sw->con_clear(vc, 0, 0,
1177                                               vc->vc_rows,
1178                                               vc->vc_cols);
1179                         break;
1180                 default:
1181                         return;
1182         }
1183         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1184         vc->vc_need_wrap = 0;
1185 }
1186
1187 static void csi_K(struct vc_data *vc, int vpar)
1188 {
1189         unsigned int count;
1190         unsigned short * start;
1191
1192         switch (vpar) {
1193                 case 0: /* erase from cursor to end of line */
1194                         count = vc->vc_cols - vc->vc_x;
1195                         start = (unsigned short *)vc->vc_pos;
1196                         if (DO_UPDATE(vc))
1197                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1198                                                      vc->vc_cols - vc->vc_x);
1199                         break;
1200                 case 1: /* erase from start of line to cursor */
1201                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1202                         count = vc->vc_x + 1;
1203                         if (DO_UPDATE(vc))
1204                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1205                                                      vc->vc_x + 1);
1206                         break;
1207                 case 2: /* erase whole line */
1208                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1209                         count = vc->vc_cols;
1210                         if (DO_UPDATE(vc))
1211                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1212                                               vc->vc_cols);
1213                         break;
1214                 default:
1215                         return;
1216         }
1217         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1218         vc->vc_need_wrap = 0;
1219 }
1220
1221 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1222 {                                         /* not vt100? */
1223         int count;
1224
1225         if (!vpar)
1226                 vpar++;
1227         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1228
1229         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1230         if (DO_UPDATE(vc))
1231                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1232         vc->vc_need_wrap = 0;
1233 }
1234
1235 static void default_attr(struct vc_data *vc)
1236 {
1237         vc->vc_intensity = 1;
1238         vc->vc_italic = 0;
1239         vc->vc_underline = 0;
1240         vc->vc_reverse = 0;
1241         vc->vc_blink = 0;
1242         vc->vc_color = vc->vc_def_color;
1243 }
1244
1245 /* console_sem is held */
1246 static void csi_m(struct vc_data *vc)
1247 {
1248         int i;
1249
1250         for (i = 0; i <= vc->vc_npar; i++)
1251                 switch (vc->vc_par[i]) {
1252                         case 0: /* all attributes off */
1253                                 default_attr(vc);
1254                                 break;
1255                         case 1:
1256                                 vc->vc_intensity = 2;
1257                                 break;
1258                         case 2:
1259                                 vc->vc_intensity = 0;
1260                                 break;
1261                         case 3:
1262                                 vc->vc_italic = 1;
1263                                 break;
1264                         case 4:
1265                                 vc->vc_underline = 1;
1266                                 break;
1267                         case 5:
1268                                 vc->vc_blink = 1;
1269                                 break;
1270                         case 7:
1271                                 vc->vc_reverse = 1;
1272                                 break;
1273                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1274                                   * Select primary font, don't display
1275                                   * control chars if defined, don't set
1276                                   * bit 8 on output.
1277                                   */
1278                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1279                                                 ? vc->vc_G0_charset
1280                                                 : vc->vc_G1_charset, vc);
1281                                 vc->vc_disp_ctrl = 0;
1282                                 vc->vc_toggle_meta = 0;
1283                                 break;
1284                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1285                                   * Select first alternate font, lets
1286                                   * chars < 32 be displayed as ROM chars.
1287                                   */
1288                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1289                                 vc->vc_disp_ctrl = 1;
1290                                 vc->vc_toggle_meta = 0;
1291                                 break;
1292                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1293                                   * Select second alternate font, toggle
1294                                   * high bit before displaying as ROM char.
1295                                   */
1296                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1297                                 vc->vc_disp_ctrl = 1;
1298                                 vc->vc_toggle_meta = 1;
1299                                 break;
1300                         case 21:
1301                         case 22:
1302                                 vc->vc_intensity = 1;
1303                                 break;
1304                         case 23:
1305                                 vc->vc_italic = 0;
1306                                 break;
1307                         case 24:
1308                                 vc->vc_underline = 0;
1309                                 break;
1310                         case 25:
1311                                 vc->vc_blink = 0;
1312                                 break;
1313                         case 27:
1314                                 vc->vc_reverse = 0;
1315                                 break;
1316                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1317                                   * Enables underscore, white foreground
1318                                   * with white underscore (Linux - use
1319                                   * default foreground).
1320                                   */
1321                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1322                                 vc->vc_underline = 1;
1323                                 break;
1324                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1325                                   * Disable underline option.
1326                                   * Reset colour to default? It did this
1327                                   * before...
1328                                   */
1329                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1330                                 vc->vc_underline = 0;
1331                                 break;
1332                         case 49:
1333                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1334                                 break;
1335                         default:
1336                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1337                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1338                                                 | (vc->vc_color & 0xf0);
1339                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1340                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1341                                                 | (vc->vc_color & 0x0f);
1342                                 break;
1343                 }
1344         update_attr(vc);
1345 }
1346
1347 static void respond_string(const char *p, struct tty_struct *tty)
1348 {
1349         while (*p) {
1350                 tty_insert_flip_char(tty, *p, 0);
1351                 p++;
1352         }
1353         con_schedule_flip(tty);
1354 }
1355
1356 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1357 {
1358         char buf[40];
1359
1360         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1361         respond_string(buf, tty);
1362 }
1363
1364 static inline void status_report(struct tty_struct *tty)
1365 {
1366         respond_string("\033[0n", tty); /* Terminal ok */
1367 }
1368
1369 static inline void respond_ID(struct tty_struct * tty)
1370 {
1371         respond_string(VT102ID, tty);
1372 }
1373
1374 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1375 {
1376         char buf[8];
1377
1378         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1379                 (char)('!' + mry));
1380         respond_string(buf, tty);
1381 }
1382
1383 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1384 int mouse_reporting(void)
1385 {
1386         return vc_cons[fg_console].d->vc_report_mouse;
1387 }
1388
1389 /* console_sem is held */
1390 static void set_mode(struct vc_data *vc, int on_off)
1391 {
1392         int i;
1393
1394         for (i = 0; i <= vc->vc_npar; i++)
1395                 if (vc->vc_ques) {
1396                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1397                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1398                                 if (on_off)
1399                                         set_kbd(vc, decckm);
1400                                 else
1401                                         clr_kbd(vc, decckm);
1402                                 break;
1403                         case 3: /* 80/132 mode switch unimplemented */
1404                                 vc->vc_deccolm = on_off;
1405 #if 0
1406                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1407                                 /* this alone does not suffice; some user mode
1408                                    utility has to change the hardware regs */
1409 #endif
1410                                 break;
1411                         case 5:                 /* Inverted screen on/off */
1412                                 if (vc->vc_decscnm != on_off) {
1413                                         vc->vc_decscnm = on_off;
1414                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1415                                         update_attr(vc);
1416                                 }
1417                                 break;
1418                         case 6:                 /* Origin relative/absolute */
1419                                 vc->vc_decom = on_off;
1420                                 gotoxay(vc, 0, 0);
1421                                 break;
1422                         case 7:                 /* Autowrap on/off */
1423                                 vc->vc_decawm = on_off;
1424                                 break;
1425                         case 8:                 /* Autorepeat on/off */
1426                                 if (on_off)
1427                                         set_kbd(vc, decarm);
1428                                 else
1429                                         clr_kbd(vc, decarm);
1430                                 break;
1431                         case 9:
1432                                 vc->vc_report_mouse = on_off ? 1 : 0;
1433                                 break;
1434                         case 25:                /* Cursor on/off */
1435                                 vc->vc_deccm = on_off;
1436                                 break;
1437                         case 1000:
1438                                 vc->vc_report_mouse = on_off ? 2 : 0;
1439                                 break;
1440                         }
1441                 } else {
1442                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1443                         case 3:                 /* Monitor (display ctrls) */
1444                                 vc->vc_disp_ctrl = on_off;
1445                                 break;
1446                         case 4:                 /* Insert Mode on/off */
1447                                 vc->vc_decim = on_off;
1448                                 break;
1449                         case 20:                /* Lf, Enter == CrLf/Lf */
1450                                 if (on_off)
1451                                         set_kbd(vc, lnm);
1452                                 else
1453                                         clr_kbd(vc, lnm);
1454                                 break;
1455                         }
1456                 }
1457 }
1458
1459 /* console_sem is held */
1460 static void setterm_command(struct vc_data *vc)
1461 {
1462         switch(vc->vc_par[0]) {
1463                 case 1: /* set color for underline mode */
1464                         if (vc->vc_can_do_color &&
1465                                         vc->vc_par[1] < 16) {
1466                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1467                                 if (vc->vc_underline)
1468                                         update_attr(vc);
1469                         }
1470                         break;
1471                 case 2: /* set color for half intensity mode */
1472                         if (vc->vc_can_do_color &&
1473                                         vc->vc_par[1] < 16) {
1474                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1475                                 if (vc->vc_intensity == 0)
1476                                         update_attr(vc);
1477                         }
1478                         break;
1479                 case 8: /* store colors as defaults */
1480                         vc->vc_def_color = vc->vc_attr;
1481                         if (vc->vc_hi_font_mask == 0x100)
1482                                 vc->vc_def_color >>= 1;
1483                         default_attr(vc);
1484                         update_attr(vc);
1485                         break;
1486                 case 9: /* set blanking interval */
1487                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1488                         poke_blanked_console();
1489                         break;
1490                 case 10: /* set bell frequency in Hz */
1491                         if (vc->vc_npar >= 1)
1492                                 vc->vc_bell_pitch = vc->vc_par[1];
1493                         else
1494                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1495                         break;
1496                 case 11: /* set bell duration in msec */
1497                         if (vc->vc_npar >= 1)
1498                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1499                                         vc->vc_par[1] * HZ / 1000 : 0;
1500                         else
1501                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1502                         break;
1503                 case 12: /* bring specified console to the front */
1504                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1505                                 set_console(vc->vc_par[1] - 1);
1506                         break;
1507                 case 13: /* unblank the screen */
1508                         poke_blanked_console();
1509                         break;
1510                 case 14: /* set vesa powerdown interval */
1511                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1512                         break;
1513                 case 15: /* activate the previous console */
1514                         set_console(last_console);
1515                         break;
1516         }
1517 }
1518
1519 /* console_sem is held */
1520 static void csi_at(struct vc_data *vc, unsigned int nr)
1521 {
1522         if (nr > vc->vc_cols - vc->vc_x)
1523                 nr = vc->vc_cols - vc->vc_x;
1524         else if (!nr)
1525                 nr = 1;
1526         insert_char(vc, nr);
1527 }
1528
1529 /* console_sem is held */
1530 static void csi_L(struct vc_data *vc, unsigned int nr)
1531 {
1532         if (nr > vc->vc_rows - vc->vc_y)
1533                 nr = vc->vc_rows - vc->vc_y;
1534         else if (!nr)
1535                 nr = 1;
1536         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1537         vc->vc_need_wrap = 0;
1538 }
1539
1540 /* console_sem is held */
1541 static void csi_P(struct vc_data *vc, unsigned int nr)
1542 {
1543         if (nr > vc->vc_cols - vc->vc_x)
1544                 nr = vc->vc_cols - vc->vc_x;
1545         else if (!nr)
1546                 nr = 1;
1547         delete_char(vc, nr);
1548 }
1549
1550 /* console_sem is held */
1551 static void csi_M(struct vc_data *vc, unsigned int nr)
1552 {
1553         if (nr > vc->vc_rows - vc->vc_y)
1554                 nr = vc->vc_rows - vc->vc_y;
1555         else if (!nr)
1556                 nr=1;
1557         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1558         vc->vc_need_wrap = 0;
1559 }
1560
1561 /* console_sem is held (except via vc_init->reset_terminal */
1562 static void save_cur(struct vc_data *vc)
1563 {
1564         vc->vc_saved_x          = vc->vc_x;
1565         vc->vc_saved_y          = vc->vc_y;
1566         vc->vc_s_intensity      = vc->vc_intensity;
1567         vc->vc_s_italic         = vc->vc_italic;
1568         vc->vc_s_underline      = vc->vc_underline;
1569         vc->vc_s_blink          = vc->vc_blink;
1570         vc->vc_s_reverse        = vc->vc_reverse;
1571         vc->vc_s_charset        = vc->vc_charset;
1572         vc->vc_s_color          = vc->vc_color;
1573         vc->vc_saved_G0         = vc->vc_G0_charset;
1574         vc->vc_saved_G1         = vc->vc_G1_charset;
1575 }
1576
1577 /* console_sem is held */
1578 static void restore_cur(struct vc_data *vc)
1579 {
1580         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1581         vc->vc_intensity        = vc->vc_s_intensity;
1582         vc->vc_italic           = vc->vc_s_italic;
1583         vc->vc_underline        = vc->vc_s_underline;
1584         vc->vc_blink            = vc->vc_s_blink;
1585         vc->vc_reverse          = vc->vc_s_reverse;
1586         vc->vc_charset          = vc->vc_s_charset;
1587         vc->vc_color            = vc->vc_s_color;
1588         vc->vc_G0_charset       = vc->vc_saved_G0;
1589         vc->vc_G1_charset       = vc->vc_saved_G1;
1590         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1591         update_attr(vc);
1592         vc->vc_need_wrap = 0;
1593 }
1594
1595 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1596         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1597         ESpalette };
1598
1599 /* console_sem is held (except via vc_init()) */
1600 static void reset_terminal(struct vc_data *vc, int do_clear)
1601 {
1602         vc->vc_top              = 0;
1603         vc->vc_bottom           = vc->vc_rows;
1604         vc->vc_state            = ESnormal;
1605         vc->vc_ques             = 0;
1606         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1607         vc->vc_G0_charset       = LAT1_MAP;
1608         vc->vc_G1_charset       = GRAF_MAP;
1609         vc->vc_charset          = 0;
1610         vc->vc_need_wrap        = 0;
1611         vc->vc_report_mouse     = 0;
1612         vc->vc_utf              = default_utf8;
1613         vc->vc_utf_count        = 0;
1614
1615         vc->vc_disp_ctrl        = 0;
1616         vc->vc_toggle_meta      = 0;
1617
1618         vc->vc_decscnm          = 0;
1619         vc->vc_decom            = 0;
1620         vc->vc_decawm           = 1;
1621         vc->vc_deccm            = 1;
1622         vc->vc_decim            = 0;
1623
1624         set_kbd(vc, decarm);
1625         clr_kbd(vc, decckm);
1626         clr_kbd(vc, kbdapplic);
1627         clr_kbd(vc, lnm);
1628         kbd_table[vc->vc_num].lockstate = 0;
1629         kbd_table[vc->vc_num].slockstate = 0;
1630         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1631         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1632         /* do not do set_leds here because this causes an endless tasklet loop
1633            when the keyboard hasn't been initialized yet */
1634
1635         vc->vc_cursor_type = CUR_DEFAULT;
1636         vc->vc_complement_mask = vc->vc_s_complement_mask;
1637
1638         default_attr(vc);
1639         update_attr(vc);
1640
1641         vc->vc_tab_stop[0]      = 0x01010100;
1642         vc->vc_tab_stop[1]      =
1643         vc->vc_tab_stop[2]      =
1644         vc->vc_tab_stop[3]      =
1645         vc->vc_tab_stop[4]      =
1646         vc->vc_tab_stop[5]      =
1647         vc->vc_tab_stop[6]      =
1648         vc->vc_tab_stop[7]      = 0x01010101;
1649
1650         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1651         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1652
1653         gotoxy(vc, 0, 0);
1654         save_cur(vc);
1655         if (do_clear)
1656             csi_J(vc, 2);
1657 }
1658
1659 /* console_sem is held */
1660 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1661 {
1662         /*
1663          *  Control characters can be used in the _middle_
1664          *  of an escape sequence.
1665          */
1666         switch (c) {
1667         case 0:
1668                 return;
1669         case 7:
1670                 if (vc->vc_bell_duration)
1671                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1672                 return;
1673         case 8:
1674                 bs(vc);
1675                 return;
1676         case 9:
1677                 vc->vc_pos -= (vc->vc_x << 1);
1678                 while (vc->vc_x < vc->vc_cols - 1) {
1679                         vc->vc_x++;
1680                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1681                                 break;
1682                 }
1683                 vc->vc_pos += (vc->vc_x << 1);
1684                 notify_write(vc, '\t');
1685                 return;
1686         case 10: case 11: case 12:
1687                 lf(vc);
1688                 if (!is_kbd(vc, lnm))
1689                         return;
1690         case 13:
1691                 cr(vc);
1692                 return;
1693         case 14:
1694                 vc->vc_charset = 1;
1695                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1696                 vc->vc_disp_ctrl = 1;
1697                 return;
1698         case 15:
1699                 vc->vc_charset = 0;
1700                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1701                 vc->vc_disp_ctrl = 0;
1702                 return;
1703         case 24: case 26:
1704                 vc->vc_state = ESnormal;
1705                 return;
1706         case 27:
1707                 vc->vc_state = ESesc;
1708                 return;
1709         case 127:
1710                 del(vc);
1711                 return;
1712         case 128+27:
1713                 vc->vc_state = ESsquare;
1714                 return;
1715         }
1716         switch(vc->vc_state) {
1717         case ESesc:
1718                 vc->vc_state = ESnormal;
1719                 switch (c) {
1720                 case '[':
1721                         vc->vc_state = ESsquare;
1722                         return;
1723                 case ']':
1724                         vc->vc_state = ESnonstd;
1725                         return;
1726                 case '%':
1727                         vc->vc_state = ESpercent;
1728                         return;
1729                 case 'E':
1730                         cr(vc);
1731                         lf(vc);
1732                         return;
1733                 case 'M':
1734                         ri(vc);
1735                         return;
1736                 case 'D':
1737                         lf(vc);
1738                         return;
1739                 case 'H':
1740                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1741                         return;
1742                 case 'Z':
1743                         respond_ID(tty);
1744                         return;
1745                 case '7':
1746                         save_cur(vc);
1747                         return;
1748                 case '8':
1749                         restore_cur(vc);
1750                         return;
1751                 case '(':
1752                         vc->vc_state = ESsetG0;
1753                         return;
1754                 case ')':
1755                         vc->vc_state = ESsetG1;
1756                         return;
1757                 case '#':
1758                         vc->vc_state = EShash;
1759                         return;
1760                 case 'c':
1761                         reset_terminal(vc, 1);
1762                         return;
1763                 case '>':  /* Numeric keypad */
1764                         clr_kbd(vc, kbdapplic);
1765                         return;
1766                 case '=':  /* Appl. keypad */
1767                         set_kbd(vc, kbdapplic);
1768                         return;
1769                 }
1770                 return;
1771         case ESnonstd:
1772                 if (c=='P') {   /* palette escape sequence */
1773                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1774                                 vc->vc_par[vc->vc_npar] = 0;
1775                         vc->vc_npar = 0;
1776                         vc->vc_state = ESpalette;
1777                         return;
1778                 } else if (c=='R') {   /* reset palette */
1779                         reset_palette(vc);
1780                         vc->vc_state = ESnormal;
1781                 } else
1782                         vc->vc_state = ESnormal;
1783                 return;
1784         case ESpalette:
1785                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1786                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1787                         if (vc->vc_npar == 7) {
1788                                 int i = vc->vc_par[0] * 3, j = 1;
1789                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1790                                 vc->vc_palette[i++] += vc->vc_par[j++];
1791                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1792                                 vc->vc_palette[i++] += vc->vc_par[j++];
1793                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1794                                 vc->vc_palette[i] += vc->vc_par[j];
1795                                 set_palette(vc);
1796                                 vc->vc_state = ESnormal;
1797                         }
1798                 } else
1799                         vc->vc_state = ESnormal;
1800                 return;
1801         case ESsquare:
1802                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1803                         vc->vc_par[vc->vc_npar] = 0;
1804                 vc->vc_npar = 0;
1805                 vc->vc_state = ESgetpars;
1806                 if (c == '[') { /* Function key */
1807                         vc->vc_state=ESfunckey;
1808                         return;
1809                 }
1810                 vc->vc_ques = (c == '?');
1811                 if (vc->vc_ques)
1812                         return;
1813         case ESgetpars:
1814                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1815                         vc->vc_npar++;
1816                         return;
1817                 } else if (c>='0' && c<='9') {
1818                         vc->vc_par[vc->vc_npar] *= 10;
1819                         vc->vc_par[vc->vc_npar] += c - '0';
1820                         return;
1821                 } else
1822                         vc->vc_state = ESgotpars;
1823         case ESgotpars:
1824                 vc->vc_state = ESnormal;
1825                 switch(c) {
1826                 case 'h':
1827                         set_mode(vc, 1);
1828                         return;
1829                 case 'l':
1830                         set_mode(vc, 0);
1831                         return;
1832                 case 'c':
1833                         if (vc->vc_ques) {
1834                                 if (vc->vc_par[0])
1835                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1836                                 else
1837                                         vc->vc_cursor_type = CUR_DEFAULT;
1838                                 return;
1839                         }
1840                         break;
1841                 case 'm':
1842                         if (vc->vc_ques) {
1843                                 clear_selection();
1844                                 if (vc->vc_par[0])
1845                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1846                                 else
1847                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1848                                 return;
1849                         }
1850                         break;
1851                 case 'n':
1852                         if (!vc->vc_ques) {
1853                                 if (vc->vc_par[0] == 5)
1854                                         status_report(tty);
1855                                 else if (vc->vc_par[0] == 6)
1856                                         cursor_report(vc, tty);
1857                         }
1858                         return;
1859                 }
1860                 if (vc->vc_ques) {
1861                         vc->vc_ques = 0;
1862                         return;
1863                 }
1864                 switch(c) {
1865                 case 'G': case '`':
1866                         if (vc->vc_par[0])
1867                                 vc->vc_par[0]--;
1868                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1869                         return;
1870                 case 'A':
1871                         if (!vc->vc_par[0])
1872                                 vc->vc_par[0]++;
1873                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1874                         return;
1875                 case 'B': case 'e':
1876                         if (!vc->vc_par[0])
1877                                 vc->vc_par[0]++;
1878                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1879                         return;
1880                 case 'C': case 'a':
1881                         if (!vc->vc_par[0])
1882                                 vc->vc_par[0]++;
1883                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1884                         return;
1885                 case 'D':
1886                         if (!vc->vc_par[0])
1887                                 vc->vc_par[0]++;
1888                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1889                         return;
1890                 case 'E':
1891                         if (!vc->vc_par[0])
1892                                 vc->vc_par[0]++;
1893                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1894                         return;
1895                 case 'F':
1896                         if (!vc->vc_par[0])
1897                                 vc->vc_par[0]++;
1898                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1899                         return;
1900                 case 'd':
1901                         if (vc->vc_par[0])
1902                                 vc->vc_par[0]--;
1903                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1904                         return;
1905                 case 'H': case 'f':
1906                         if (vc->vc_par[0])
1907                                 vc->vc_par[0]--;
1908                         if (vc->vc_par[1])
1909                                 vc->vc_par[1]--;
1910                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1911                         return;
1912                 case 'J':
1913                         csi_J(vc, vc->vc_par[0]);
1914                         return;
1915                 case 'K':
1916                         csi_K(vc, vc->vc_par[0]);
1917                         return;
1918                 case 'L':
1919                         csi_L(vc, vc->vc_par[0]);
1920                         return;
1921                 case 'M':
1922                         csi_M(vc, vc->vc_par[0]);
1923                         return;
1924                 case 'P':
1925                         csi_P(vc, vc->vc_par[0]);
1926                         return;
1927                 case 'c':
1928                         if (!vc->vc_par[0])
1929                                 respond_ID(tty);
1930                         return;
1931                 case 'g':
1932                         if (!vc->vc_par[0])
1933                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1934                         else if (vc->vc_par[0] == 3) {
1935                                 vc->vc_tab_stop[0] =
1936                                         vc->vc_tab_stop[1] =
1937                                         vc->vc_tab_stop[2] =
1938                                         vc->vc_tab_stop[3] =
1939                                         vc->vc_tab_stop[4] =
1940                                         vc->vc_tab_stop[5] =
1941                                         vc->vc_tab_stop[6] =
1942                                         vc->vc_tab_stop[7] = 0;
1943                         }
1944                         return;
1945                 case 'm':
1946                         csi_m(vc);
1947                         return;
1948                 case 'q': /* DECLL - but only 3 leds */
1949                         /* map 0,1,2,3 to 0,1,2,4 */
1950                         if (vc->vc_par[0] < 4)
1951                                 setledstate(kbd_table + vc->vc_num,
1952                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1953                         return;
1954                 case 'r':
1955                         if (!vc->vc_par[0])
1956                                 vc->vc_par[0]++;
1957                         if (!vc->vc_par[1])
1958                                 vc->vc_par[1] = vc->vc_rows;
1959                         /* Minimum allowed region is 2 lines */
1960                         if (vc->vc_par[0] < vc->vc_par[1] &&
1961                             vc->vc_par[1] <= vc->vc_rows) {
1962                                 vc->vc_top = vc->vc_par[0] - 1;
1963                                 vc->vc_bottom = vc->vc_par[1];
1964                                 gotoxay(vc, 0, 0);
1965                         }
1966                         return;
1967                 case 's':
1968                         save_cur(vc);
1969                         return;
1970                 case 'u':
1971                         restore_cur(vc);
1972                         return;
1973                 case 'X':
1974                         csi_X(vc, vc->vc_par[0]);
1975                         return;
1976                 case '@':
1977                         csi_at(vc, vc->vc_par[0]);
1978                         return;
1979                 case ']': /* setterm functions */
1980                         setterm_command(vc);
1981                         return;
1982                 }
1983                 return;
1984         case ESpercent:
1985                 vc->vc_state = ESnormal;
1986                 switch (c) {
1987                 case '@':  /* defined in ISO 2022 */
1988                         vc->vc_utf = 0;
1989                         return;
1990                 case 'G':  /* prelim official escape code */
1991                 case '8':  /* retained for compatibility */
1992                         vc->vc_utf = 1;
1993                         return;
1994                 }
1995                 return;
1996         case ESfunckey:
1997                 vc->vc_state = ESnormal;
1998                 return;
1999         case EShash:
2000                 vc->vc_state = ESnormal;
2001                 if (c == '8') {
2002                         /* DEC screen alignment test. kludge :-) */
2003                         vc->vc_video_erase_char =
2004                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2005                         csi_J(vc, 2);
2006                         vc->vc_video_erase_char =
2007                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2008                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2009                 }
2010                 return;
2011         case ESsetG0:
2012                 if (c == '0')
2013                         vc->vc_G0_charset = GRAF_MAP;
2014                 else if (c == 'B')
2015                         vc->vc_G0_charset = LAT1_MAP;
2016                 else if (c == 'U')
2017                         vc->vc_G0_charset = IBMPC_MAP;
2018                 else if (c == 'K')
2019                         vc->vc_G0_charset = USER_MAP;
2020                 if (vc->vc_charset == 0)
2021                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2022                 vc->vc_state = ESnormal;
2023                 return;
2024         case ESsetG1:
2025                 if (c == '0')
2026                         vc->vc_G1_charset = GRAF_MAP;
2027                 else if (c == 'B')
2028                         vc->vc_G1_charset = LAT1_MAP;
2029                 else if (c == 'U')
2030                         vc->vc_G1_charset = IBMPC_MAP;
2031                 else if (c == 'K')
2032                         vc->vc_G1_charset = USER_MAP;
2033                 if (vc->vc_charset == 1)
2034                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2035                 vc->vc_state = ESnormal;
2036                 return;
2037         default:
2038                 vc->vc_state = ESnormal;
2039         }
2040 }
2041
2042 /* This is a temporary buffer used to prepare a tty console write
2043  * so that we can easily avoid touching user space while holding the
2044  * console spinlock.  It is allocated in con_init and is shared by
2045  * this code and the vc_screen read/write tty calls.
2046  *
2047  * We have to allocate this statically in the kernel data section
2048  * since console_init (and thus con_init) are called before any
2049  * kernel memory allocation is available.
2050  */
2051 char con_buf[CON_BUF_SIZE];
2052 DEFINE_MUTEX(con_buf_mtx);
2053
2054 /* is_double_width() is based on the wcwidth() implementation by
2055  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2056  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2057  */
2058 struct interval {
2059         uint32_t first;
2060         uint32_t last;
2061 };
2062
2063 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2064 {
2065         int min = 0;
2066         int mid;
2067
2068         if (ucs < table[0].first || ucs > table[max].last)
2069                 return 0;
2070         while (max >= min) {
2071                 mid = (min + max) / 2;
2072                 if (ucs > table[mid].last)
2073                         min = mid + 1;
2074                 else if (ucs < table[mid].first)
2075                         max = mid - 1;
2076                 else
2077                         return 1;
2078         }
2079         return 0;
2080 }
2081
2082 static int is_double_width(uint32_t ucs)
2083 {
2084         static const struct interval double_width[] = {
2085                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2086                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2087                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2088                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2089         };
2090         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2091 }
2092
2093 /* acquires console_sem */
2094 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2095 {
2096 #ifdef VT_BUF_VRAM_ONLY
2097 #define FLUSH do { } while(0);
2098 #else
2099 #define FLUSH if (draw_x >= 0) { \
2100         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2101         draw_x = -1; \
2102         }
2103 #endif
2104
2105         int c, tc, ok, n = 0, draw_x = -1;
2106         unsigned int currcons;
2107         unsigned long draw_from = 0, draw_to = 0;
2108         struct vc_data *vc;
2109         unsigned char vc_attr;
2110         struct vt_notifier_param param;
2111         uint8_t rescan;
2112         uint8_t inverse;
2113         uint8_t width;
2114         u16 himask, charmask;
2115         const unsigned char *orig_buf = NULL;
2116         int orig_count;
2117
2118         if (in_interrupt())
2119                 return count;
2120
2121         might_sleep();
2122
2123         acquire_console_sem();
2124         vc = tty->driver_data;
2125         if (vc == NULL) {
2126                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2127                 release_console_sem();
2128                 return 0;
2129         }
2130
2131         currcons = vc->vc_num;
2132         if (!vc_cons_allocated(currcons)) {
2133             /* could this happen? */
2134             static int error = 0;
2135             if (!error) {
2136                 error = 1;
2137                 printk("con_write: tty %d not allocated\n", currcons+1);
2138             }
2139             release_console_sem();
2140             return 0;
2141         }
2142         orig_buf = buf;
2143         orig_count = count;
2144
2145         himask = vc->vc_hi_font_mask;
2146         charmask = himask ? 0x1ff : 0xff;
2147
2148         /* undraw cursor first */
2149         if (IS_FG(vc))
2150                 hide_cursor(vc);
2151
2152         param.vc = vc;
2153
2154         while (!tty->stopped && count) {
2155                 int orig = *buf;
2156                 c = orig;
2157                 buf++;
2158                 n++;
2159                 count--;
2160                 rescan = 0;
2161                 inverse = 0;
2162                 width = 1;
2163
2164                 /* Do no translation at all in control states */
2165                 if (vc->vc_state != ESnormal) {
2166                         tc = c;
2167                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2168                     /* Combine UTF-8 into Unicode in vc_utf_char.
2169                      * vc_utf_count is the number of continuation bytes still
2170                      * expected to arrive.
2171                      * vc_npar is the number of continuation bytes arrived so
2172                      * far
2173                      */
2174 rescan_last_byte:
2175                     if ((c & 0xc0) == 0x80) {
2176                         /* Continuation byte received */
2177                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2178                         if (vc->vc_utf_count) {
2179                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2180                             vc->vc_npar++;
2181                             if (--vc->vc_utf_count) {
2182                                 /* Still need some bytes */
2183                                 continue;
2184                             }
2185                             /* Got a whole character */
2186                             c = vc->vc_utf_char;
2187                             /* Reject overlong sequences */
2188                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2189                                         c > utf8_length_changes[vc->vc_npar])
2190                                 c = 0xfffd;
2191                         } else {
2192                             /* Unexpected continuation byte */
2193                             vc->vc_utf_count = 0;
2194                             c = 0xfffd;
2195                         }
2196                     } else {
2197                         /* Single ASCII byte or first byte of a sequence received */
2198                         if (vc->vc_utf_count) {
2199                             /* Continuation byte expected */
2200                             rescan = 1;
2201                             vc->vc_utf_count = 0;
2202                             c = 0xfffd;
2203                         } else if (c > 0x7f) {
2204                             /* First byte of a multibyte sequence received */
2205                             vc->vc_npar = 0;
2206                             if ((c & 0xe0) == 0xc0) {
2207                                 vc->vc_utf_count = 1;
2208                                 vc->vc_utf_char = (c & 0x1f);
2209                             } else if ((c & 0xf0) == 0xe0) {
2210                                 vc->vc_utf_count = 2;
2211                                 vc->vc_utf_char = (c & 0x0f);
2212                             } else if ((c & 0xf8) == 0xf0) {
2213                                 vc->vc_utf_count = 3;
2214                                 vc->vc_utf_char = (c & 0x07);
2215                             } else if ((c & 0xfc) == 0xf8) {
2216                                 vc->vc_utf_count = 4;
2217                                 vc->vc_utf_char = (c & 0x03);
2218                             } else if ((c & 0xfe) == 0xfc) {
2219                                 vc->vc_utf_count = 5;
2220                                 vc->vc_utf_char = (c & 0x01);
2221                             } else {
2222                                 /* 254 and 255 are invalid */
2223                                 c = 0xfffd;
2224                             }
2225                             if (vc->vc_utf_count) {
2226                                 /* Still need some bytes */
2227                                 continue;
2228                             }
2229                         }
2230                         /* Nothing to do if an ASCII byte was received */
2231                     }
2232                     /* End of UTF-8 decoding. */
2233                     /* c is the received character, or U+FFFD for invalid sequences. */
2234                     /* Replace invalid Unicode code points with U+FFFD too */
2235                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2236                         c = 0xfffd;
2237                     tc = c;
2238                 } else {        /* no utf or alternate charset mode */
2239                     tc = vc_translate(vc, c);
2240                 }
2241
2242                 param.c = tc;
2243                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2244                                         &param) == NOTIFY_STOP)
2245                         continue;
2246
2247                 /* If the original code was a control character we
2248                  * only allow a glyph to be displayed if the code is
2249                  * not normally used (such as for cursor movement) or
2250                  * if the disp_ctrl mode has been explicitly enabled.
2251                  * Certain characters (as given by the CTRL_ALWAYS
2252                  * bitmap) are always displayed as control characters,
2253                  * as the console would be pretty useless without
2254                  * them; to display an arbitrary font position use the
2255                  * direct-to-font zone in UTF-8 mode.
2256                  */
2257                 ok = tc && (c >= 32 ||
2258                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2259                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2260                         && (c != 127 || vc->vc_disp_ctrl)
2261                         && (c != 128+27);
2262
2263                 if (vc->vc_state == ESnormal && ok) {
2264                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2265                                 if (is_double_width(c))
2266                                         width = 2;
2267                         }
2268                         /* Now try to find out how to display it */
2269                         tc = conv_uni_to_pc(vc, tc);
2270                         if (tc & ~charmask) {
2271                                 if (tc == -1 || tc == -2) {
2272                                     continue; /* nothing to display */
2273                                 }
2274                                 /* Glyph not found */
2275                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) && c < 128) && !(c & ~charmask)) {
2276                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2277                                        This would make absolutely no sense with Unicode in mind,
2278                                        but do this for ASCII characters since a font may lack
2279                                        Unicode mapping info and we don't want to end up with
2280                                        having question marks only. */
2281                                     tc = c;
2282                                 } else {
2283                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2284                                     tc = conv_uni_to_pc(vc, 0xfffd);
2285                                     if (tc < 0) {
2286                                         inverse = 1;
2287                                         tc = conv_uni_to_pc(vc, '?');
2288                                         if (tc < 0) tc = '?';
2289                                     }
2290                                 }
2291                         }
2292
2293                         if (!inverse) {
2294                                 vc_attr = vc->vc_attr;
2295                         } else {
2296                                 /* invert vc_attr */
2297                                 if (!vc->vc_can_do_color) {
2298                                         vc_attr = (vc->vc_attr) ^ 0x08;
2299                                 } else if (vc->vc_hi_font_mask == 0x100) {
2300                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2301                                 } else {
2302                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2303                                 }
2304                                 FLUSH
2305                         }
2306
2307                         while (1) {
2308                                 if (vc->vc_need_wrap || vc->vc_decim)
2309                                         FLUSH
2310                                 if (vc->vc_need_wrap) {
2311                                         cr(vc);
2312                                         lf(vc);
2313                                 }
2314                                 if (vc->vc_decim)
2315                                         insert_char(vc, 1);
2316                                 scr_writew(himask ?
2317                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2318                                              (vc_attr << 8) + tc,
2319                                            (u16 *) vc->vc_pos);
2320                                 if (DO_UPDATE(vc) && draw_x < 0) {
2321                                         draw_x = vc->vc_x;
2322                                         draw_from = vc->vc_pos;
2323                                 }
2324                                 if (vc->vc_x == vc->vc_cols - 1) {
2325                                         vc->vc_need_wrap = vc->vc_decawm;
2326                                         draw_to = vc->vc_pos + 2;
2327                                 } else {
2328                                         vc->vc_x++;
2329                                         draw_to = (vc->vc_pos += 2);
2330                                 }
2331
2332                                 if (!--width) break;
2333
2334                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2335                                 if (tc < 0) tc = ' ';
2336                         }
2337                         notify_write(vc, c);
2338
2339                         if (inverse) {
2340                                 FLUSH
2341                         }
2342
2343                         if (rescan) {
2344                                 rescan = 0;
2345                                 inverse = 0;
2346                                 width = 1;
2347                                 c = orig;
2348                                 goto rescan_last_byte;
2349                         }
2350                         continue;
2351                 }
2352                 FLUSH
2353                 do_con_trol(tty, vc, orig);
2354         }
2355         FLUSH
2356         console_conditional_schedule();
2357         release_console_sem();
2358         notify_update(vc);
2359         return n;
2360 #undef FLUSH
2361 }
2362
2363 /*
2364  * This is the console switching callback.
2365  *
2366  * Doing console switching in a process context allows
2367  * us to do the switches asynchronously (needed when we want
2368  * to switch due to a keyboard interrupt).  Synchronization
2369  * with other console code and prevention of re-entrancy is
2370  * ensured with console_sem.
2371  */
2372 static void console_callback(struct work_struct *ignored)
2373 {
2374         acquire_console_sem();
2375
2376         if (want_console >= 0) {
2377                 if (want_console != fg_console &&
2378                     vc_cons_allocated(want_console)) {
2379                         hide_cursor(vc_cons[fg_console].d);
2380                         change_console(vc_cons[want_console].d);
2381                         /* we only changed when the console had already
2382                            been allocated - a new console is not created
2383                            in an interrupt routine */
2384                 }
2385                 want_console = -1;
2386         }
2387         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2388                 do_poke_blanked_console = 0;
2389                 poke_blanked_console();
2390         }
2391         if (scrollback_delta) {
2392                 struct vc_data *vc = vc_cons[fg_console].d;
2393                 clear_selection();
2394                 if (vc->vc_mode == KD_TEXT)
2395                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2396                 scrollback_delta = 0;
2397         }
2398         if (blank_timer_expired) {
2399                 do_blank_screen(0);
2400                 blank_timer_expired = 0;
2401         }
2402         notify_update(vc_cons[fg_console].d);
2403
2404         release_console_sem();
2405 }
2406
2407 int set_console(int nr)
2408 {
2409         struct vc_data *vc = vc_cons[fg_console].d;
2410
2411         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2412                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2413
2414                 /*
2415                  * Console switch will fail in console_callback() or
2416                  * change_console() so there is no point scheduling
2417                  * the callback
2418                  *
2419                  * Existing set_console() users don't check the return
2420                  * value so this shouldn't break anything
2421                  */
2422                 return -EINVAL;
2423         }
2424
2425         want_console = nr;
2426         schedule_console_callback();
2427
2428         return 0;
2429 }
2430
2431 struct tty_driver *console_driver;
2432
2433 #ifdef CONFIG_VT_CONSOLE
2434
2435 /*
2436  *      Console on virtual terminal
2437  *
2438  * The console must be locked when we get here.
2439  */
2440
2441 static void vt_console_print(struct console *co, const char *b, unsigned count)
2442 {
2443         struct vc_data *vc = vc_cons[fg_console].d;
2444         unsigned char c;
2445         static DEFINE_SPINLOCK(printing_lock);
2446         const ushort *start;
2447         ushort cnt = 0;
2448         ushort myx;
2449
2450         /* console busy or not yet initialized */
2451         if (!printable)
2452                 return;
2453         if (!spin_trylock(&printing_lock))
2454                 return;
2455
2456         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2457                 vc = vc_cons[kmsg_redirect - 1].d;
2458
2459         /* read `x' only after setting currcons properly (otherwise
2460            the `x' macro will read the x of the foreground console). */
2461         myx = vc->vc_x;
2462
2463         if (!vc_cons_allocated(fg_console)) {
2464                 /* impossible */
2465                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2466                 goto quit;
2467         }
2468
2469         if (vc->vc_mode != KD_TEXT)
2470                 goto quit;
2471
2472         /* undraw cursor first */
2473         if (IS_FG(vc))
2474                 hide_cursor(vc);
2475
2476         start = (ushort *)vc->vc_pos;
2477
2478         /* Contrived structure to try to emulate original need_wrap behaviour
2479          * Problems caused when we have need_wrap set on '\n' character */
2480         while (count--) {
2481                 c = *b++;
2482                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2483                         if (cnt > 0) {
2484                                 if (CON_IS_VISIBLE(vc))
2485                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2486                                 vc->vc_x += cnt;
2487                                 if (vc->vc_need_wrap)
2488                                         vc->vc_x--;
2489                                 cnt = 0;
2490                         }
2491                         if (c == 8) {           /* backspace */
2492                                 bs(vc);
2493                                 start = (ushort *)vc->vc_pos;
2494                                 myx = vc->vc_x;
2495                                 continue;
2496                         }
2497                         if (c != 13)
2498                                 lf(vc);
2499                         cr(vc);
2500                         start = (ushort *)vc->vc_pos;
2501                         myx = vc->vc_x;
2502                         if (c == 10 || c == 13)
2503                                 continue;
2504                 }
2505                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2506                 notify_write(vc, c);
2507                 cnt++;
2508                 if (myx == vc->vc_cols - 1) {
2509                         vc->vc_need_wrap = 1;
2510                         continue;
2511                 }
2512                 vc->vc_pos += 2;
2513                 myx++;
2514         }
2515         if (cnt > 0) {
2516                 if (CON_IS_VISIBLE(vc))
2517                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2518                 vc->vc_x += cnt;
2519                 if (vc->vc_x == vc->vc_cols) {
2520                         vc->vc_x--;
2521                         vc->vc_need_wrap = 1;
2522                 }
2523         }
2524         set_cursor(vc);
2525         notify_update(vc);
2526
2527 quit:
2528         spin_unlock(&printing_lock);
2529 }
2530
2531 static struct tty_driver *vt_console_device(struct console *c, int *index)
2532 {
2533         *index = c->index ? c->index-1 : fg_console;
2534         return console_driver;
2535 }
2536
2537 static struct console vt_console_driver = {
2538         .name           = "tty",
2539         .write          = vt_console_print,
2540         .device         = vt_console_device,
2541         .unblank        = unblank_screen,
2542         .flags          = CON_PRINTBUFFER,
2543         .index          = -1,
2544 };
2545 #endif
2546
2547 /*
2548  *      Handling of Linux-specific VC ioctls
2549  */
2550
2551 /*
2552  * Generally a bit racy with respect to console_sem().
2553  *
2554  * There are some functions which don't need it.
2555  *
2556  * There are some functions which can sleep for arbitrary periods
2557  * (paste_selection) but we don't need the lock there anyway.
2558  *
2559  * set_selection has locking, and definitely needs it
2560  */
2561
2562 int tioclinux(struct tty_struct *tty, unsigned long arg)
2563 {
2564         char type, data;
2565         char __user *p = (char __user *)arg;
2566         int lines;
2567         int ret;
2568
2569         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2570                 return -EPERM;
2571         if (get_user(type, p))
2572                 return -EFAULT;
2573         ret = 0;
2574
2575         lock_kernel();
2576
2577         switch (type)
2578         {
2579                 case TIOCL_SETSEL:
2580                         acquire_console_sem();
2581                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2582                         release_console_sem();
2583                         break;
2584                 case TIOCL_PASTESEL:
2585                         ret = paste_selection(tty);
2586                         break;
2587                 case TIOCL_UNBLANKSCREEN:
2588                         acquire_console_sem();
2589                         unblank_screen();
2590                         release_console_sem();
2591                         break;
2592                 case TIOCL_SELLOADLUT:
2593                         ret = sel_loadlut(p);
2594                         break;
2595                 case TIOCL_GETSHIFTSTATE:
2596
2597         /*
2598          * Make it possible to react to Shift+Mousebutton.
2599          * Note that 'shift_state' is an undocumented
2600          * kernel-internal variable; programs not closely
2601          * related to the kernel should not use this.
2602          */
2603                         data = shift_state;
2604                         ret = __put_user(data, p);
2605                         break;
2606                 case TIOCL_GETMOUSEREPORTING:
2607                         data = mouse_reporting();
2608                         ret = __put_user(data, p);
2609                         break;
2610                 case TIOCL_SETVESABLANK:
2611                         ret = set_vesa_blanking(p);
2612                         break;
2613                 case TIOCL_GETKMSGREDIRECT:
2614                         data = kmsg_redirect;
2615                         ret = __put_user(data, p);
2616                         break;
2617                 case TIOCL_SETKMSGREDIRECT:
2618                         if (!capable(CAP_SYS_ADMIN)) {
2619                                 ret = -EPERM;
2620                         } else {
2621                                 if (get_user(data, p+1))
2622                                         ret = -EFAULT;
2623                                 else
2624                                         kmsg_redirect = data;
2625                         }
2626                         break;
2627                 case TIOCL_GETFGCONSOLE:
2628                         ret = fg_console;
2629                         break;
2630                 case TIOCL_SCROLLCONSOLE:
2631                         if (get_user(lines, (s32 __user *)(p+4))) {
2632                                 ret = -EFAULT;
2633                         } else {
2634                                 scrollfront(vc_cons[fg_console].d, lines);
2635                                 ret = 0;
2636                         }
2637                         break;
2638                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2639                         acquire_console_sem();
2640                         ignore_poke = 1;
2641                         do_blank_screen(0);
2642                         release_console_sem();
2643                         break;
2644                 case TIOCL_BLANKEDSCREEN:
2645                         ret = console_blanked;
2646                         break;
2647                 default:
2648                         ret = -EINVAL;
2649                         break;
2650         }
2651         unlock_kernel();
2652         return ret;
2653 }
2654
2655 /*
2656  * /dev/ttyN handling
2657  */
2658
2659 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2660 {
2661         int     retval;
2662
2663         retval = do_con_write(tty, buf, count);
2664         con_flush_chars(tty);
2665
2666         return retval;
2667 }
2668
2669 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2670 {
2671         if (in_interrupt())
2672                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2673         return do_con_write(tty, &ch, 1);
2674 }
2675
2676 static int con_write_room(struct tty_struct *tty)
2677 {
2678         if (tty->stopped)
2679                 return 0;
2680         return 32768;           /* No limit, really; we're not buffering */
2681 }
2682
2683 static int con_chars_in_buffer(struct tty_struct *tty)
2684 {
2685         return 0;               /* we're not buffering */
2686 }
2687
2688 /*
2689  * con_throttle and con_unthrottle are only used for
2690  * paste_selection(), which has to stuff in a large number of
2691  * characters...
2692  */
2693 static void con_throttle(struct tty_struct *tty)
2694 {
2695 }
2696
2697 static void con_unthrottle(struct tty_struct *tty)
2698 {
2699         struct vc_data *vc = tty->driver_data;
2700
2701         wake_up_interruptible(&vc->paste_wait);
2702 }
2703
2704 /*
2705  * Turn the Scroll-Lock LED on when the tty is stopped
2706  */
2707 static void con_stop(struct tty_struct *tty)
2708 {
2709         int console_num;
2710         if (!tty)
2711                 return;
2712         console_num = tty->index;
2713         if (!vc_cons_allocated(console_num))
2714                 return;
2715         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2716         set_leds();
2717 }
2718
2719 /*
2720  * Turn the Scroll-Lock LED off when the console is started
2721  */
2722 static void con_start(struct tty_struct *tty)
2723 {
2724         int console_num;
2725         if (!tty)
2726                 return;
2727         console_num = tty->index;
2728         if (!vc_cons_allocated(console_num))
2729                 return;
2730         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2731         set_leds();
2732 }
2733
2734 static void con_flush_chars(struct tty_struct *tty)
2735 {
2736         struct vc_data *vc;
2737
2738         if (in_interrupt())     /* from flush_to_ldisc */
2739                 return;
2740
2741         /* if we race with con_close(), vt may be null */
2742         acquire_console_sem();
2743         vc = tty->driver_data;
2744         if (vc)
2745                 set_cursor(vc);
2746         release_console_sem();
2747 }
2748
2749 /*
2750  * Allocate the console screen memory.
2751  */
2752 static int con_open(struct tty_struct *tty, struct file *filp)
2753 {
2754         unsigned int currcons = tty->index;
2755         int ret = 0;
2756
2757         acquire_console_sem();
2758         if (tty->driver_data == NULL) {
2759                 ret = vc_allocate(currcons);
2760                 if (ret == 0) {
2761                         struct vc_data *vc = vc_cons[currcons].d;
2762
2763                         /* Still being freed */
2764                         if (vc->vc_tty) {
2765                                 release_console_sem();
2766                                 return -ERESTARTSYS;
2767                         }
2768                         tty->driver_data = vc;
2769                         vc->vc_tty = tty;
2770
2771                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2772                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2773                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2774                         }
2775                         if (vc->vc_utf)
2776                                 tty->termios->c_iflag |= IUTF8;
2777                         else
2778                                 tty->termios->c_iflag &= ~IUTF8;
2779                         vcs_make_sysfs(tty);
2780                         release_console_sem();
2781                         return ret;
2782                 }
2783         }
2784         release_console_sem();
2785         return ret;
2786 }
2787
2788 static void con_close(struct tty_struct *tty, struct file *filp)
2789 {
2790         /* Nothing to do - we defer to shutdown */
2791 }
2792
2793 static void con_shutdown(struct tty_struct *tty)
2794 {
2795         struct vc_data *vc = tty->driver_data;
2796         BUG_ON(vc == NULL);
2797         acquire_console_sem();
2798         vc->vc_tty = NULL;
2799         vcs_remove_sysfs(tty);
2800         release_console_sem();
2801         tty_shutdown(tty);
2802 }
2803
2804 static int default_italic_color    = 2; // green (ASCII)
2805 static int default_underline_color = 3; // cyan (ASCII)
2806 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2807 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2808
2809 static void vc_init(struct vc_data *vc, unsigned int rows,
2810                     unsigned int cols, int do_clear)
2811 {
2812         int j, k ;
2813
2814         vc->vc_cols = cols;
2815         vc->vc_rows = rows;
2816         vc->vc_size_row = cols << 1;
2817         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2818
2819         set_origin(vc);
2820         vc->vc_pos = vc->vc_origin;
2821         reset_vc(vc);
2822         for (j=k=0; j<16; j++) {
2823                 vc->vc_palette[k++] = default_red[j] ;
2824                 vc->vc_palette[k++] = default_grn[j] ;
2825                 vc->vc_palette[k++] = default_blu[j] ;
2826         }
2827         vc->vc_def_color       = 0x07;   /* white */
2828         vc->vc_ulcolor         = default_underline_color;
2829         vc->vc_itcolor         = default_italic_color;
2830         vc->vc_halfcolor       = 0x08;   /* grey */
2831         init_waitqueue_head(&vc->paste_wait);
2832         reset_terminal(vc, do_clear);
2833 }
2834
2835 /*
2836  * This routine initializes console interrupts, and does nothing
2837  * else. If you want the screen to clear, call tty_write with
2838  * the appropriate escape-sequence.
2839  */
2840
2841 static int __init con_init(void)
2842 {
2843         const char *display_desc = NULL;
2844         struct vc_data *vc;
2845         unsigned int currcons = 0, i;
2846
2847         acquire_console_sem();
2848
2849         if (conswitchp)
2850                 display_desc = conswitchp->con_startup();
2851         if (!display_desc) {
2852                 fg_console = 0;
2853                 release_console_sem();
2854                 return 0;
2855         }
2856
2857         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2858                 struct con_driver *con_driver = &registered_con_driver[i];
2859
2860                 if (con_driver->con == NULL) {
2861                         con_driver->con = conswitchp;
2862                         con_driver->desc = display_desc;
2863                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2864                         con_driver->first = 0;
2865                         con_driver->last = MAX_NR_CONSOLES - 1;
2866                         break;
2867                 }
2868         }
2869
2870         for (i = 0; i < MAX_NR_CONSOLES; i++)
2871                 con_driver_map[i] = conswitchp;
2872
2873         if (blankinterval) {
2874                 blank_state = blank_normal_wait;
2875                 mod_timer(&console_timer, jiffies + blankinterval);
2876         }
2877
2878         /*
2879          * kmalloc is not running yet - we use the bootmem allocator.
2880          */
2881         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2882                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2883                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2884                 visual_init(vc, currcons, 1);
2885                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2886                 vc->vc_kmalloced = 0;
2887                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2888                         currcons || !vc->vc_sw->con_save_screen);
2889         }
2890         currcons = fg_console = 0;
2891         master_display_fg = vc = vc_cons[currcons].d;
2892         set_origin(vc);
2893         save_screen(vc);
2894         gotoxy(vc, vc->vc_x, vc->vc_y);
2895         csi_J(vc, 0);
2896         update_screen(vc);
2897         printk("Console: %s %s %dx%d",
2898                 vc->vc_can_do_color ? "colour" : "mono",
2899                 display_desc, vc->vc_cols, vc->vc_rows);
2900         printable = 1;
2901         printk("\n");
2902
2903         release_console_sem();
2904
2905 #ifdef CONFIG_VT_CONSOLE
2906         register_console(&vt_console_driver);
2907 #endif
2908         return 0;
2909 }
2910 console_initcall(con_init);
2911
2912 static const struct tty_operations con_ops = {
2913         .open = con_open,
2914         .close = con_close,
2915         .write = con_write,
2916         .write_room = con_write_room,
2917         .put_char = con_put_char,
2918         .flush_chars = con_flush_chars,
2919         .chars_in_buffer = con_chars_in_buffer,
2920         .ioctl = vt_ioctl,
2921         .stop = con_stop,
2922         .start = con_start,
2923         .throttle = con_throttle,
2924         .unthrottle = con_unthrottle,
2925         .resize = vt_resize,
2926         .shutdown = con_shutdown
2927 };
2928
2929 static struct cdev vc0_cdev;
2930
2931 int __init vty_init(const struct file_operations *console_fops)
2932 {
2933         cdev_init(&vc0_cdev, console_fops);
2934         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2935             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2936                 panic("Couldn't register /dev/tty0 driver\n");
2937         device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2938
2939         vcs_init();
2940
2941         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2942         if (!console_driver)
2943                 panic("Couldn't allocate console driver\n");
2944         console_driver->owner = THIS_MODULE;
2945         console_driver->name = "tty";
2946         console_driver->name_base = 1;
2947         console_driver->major = TTY_MAJOR;
2948         console_driver->minor_start = 1;
2949         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2950         console_driver->init_termios = tty_std_termios;
2951         if (default_utf8)
2952                 console_driver->init_termios.c_iflag |= IUTF8;
2953         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2954         tty_set_operations(console_driver, &con_ops);
2955         if (tty_register_driver(console_driver))
2956                 panic("Couldn't register console driver\n");
2957         kbd_init();
2958         console_map_init();
2959 #ifdef CONFIG_PROM_CONSOLE
2960         prom_con_init();
2961 #endif
2962 #ifdef CONFIG_MDA_CONSOLE
2963         mda_console_init();
2964 #endif
2965         return 0;
2966 }
2967
2968 #ifndef VT_SINGLE_DRIVER
2969 #include <linux/device.h>
2970
2971 static struct class *vtconsole_class;
2972
2973 static int bind_con_driver(const struct consw *csw, int first, int last,
2974                            int deflt)
2975 {
2976         struct module *owner = csw->owner;
2977         const char *desc = NULL;
2978         struct con_driver *con_driver;
2979         int i, j = -1, k = -1, retval = -ENODEV;
2980
2981         if (!try_module_get(owner))
2982                 return -ENODEV;
2983
2984         acquire_console_sem();
2985
2986         /* check if driver is registered */
2987         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2988                 con_driver = &registered_con_driver[i];
2989
2990                 if (con_driver->con == csw) {
2991                         desc = con_driver->desc;
2992                         retval = 0;
2993                         break;
2994                 }
2995         }
2996
2997         if (retval)
2998                 goto err;
2999
3000         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3001                 csw->con_startup();
3002                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3003         }
3004
3005         if (deflt) {
3006                 if (conswitchp)
3007                         module_put(conswitchp->owner);
3008
3009                 __module_get(owner);
3010                 conswitchp = csw;
3011         }
3012
3013         first = max(first, con_driver->first);
3014         last = min(last, con_driver->last);
3015
3016         for (i = first; i <= last; i++) {
3017                 int old_was_color;
3018                 struct vc_data *vc = vc_cons[i].d;
3019
3020                 if (con_driver_map[i])
3021                         module_put(con_driver_map[i]->owner);
3022                 __module_get(owner);
3023                 con_driver_map[i] = csw;
3024
3025                 if (!vc || !vc->vc_sw)
3026                         continue;
3027
3028                 j = i;
3029
3030                 if (CON_IS_VISIBLE(vc)) {
3031                         k = i;
3032                         save_screen(vc);
3033                 }
3034
3035                 old_was_color = vc->vc_can_do_color;
3036                 vc->vc_sw->con_deinit(vc);
3037                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3038                 visual_init(vc, i, 0);
3039                 set_origin(vc);
3040                 update_attr(vc);
3041
3042                 /* If the console changed between mono <-> color, then
3043                  * the attributes in the screenbuf will be wrong.  The
3044                  * following resets all attributes to something sane.
3045                  */
3046                 if (old_was_color != vc->vc_can_do_color)
3047                         clear_buffer_attributes(vc);
3048         }
3049
3050         printk("Console: switching ");
3051         if (!deflt)
3052                 printk("consoles %d-%d ", first+1, last+1);
3053         if (j >= 0) {
3054                 struct vc_data *vc = vc_cons[j].d;
3055
3056                 printk("to %s %s %dx%d\n",
3057                        vc->vc_can_do_color ? "colour" : "mono",
3058                        desc, vc->vc_cols, vc->vc_rows);
3059
3060                 if (k >= 0) {
3061                         vc = vc_cons[k].d;
3062                         update_screen(vc);
3063                 }
3064         } else
3065                 printk("to %s\n", desc);
3066
3067         retval = 0;
3068 err:
3069         release_console_sem();
3070         module_put(owner);
3071         return retval;
3072 };
3073
3074 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3075 static int con_is_graphics(const struct consw *csw, int first, int last)
3076 {
3077         int i, retval = 0;
3078
3079         for (i = first; i <= last; i++) {
3080                 struct vc_data *vc = vc_cons[i].d;
3081
3082                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3083                         retval = 1;
3084                         break;
3085                 }
3086         }
3087
3088         return retval;
3089 }
3090
3091 /**
3092  * unbind_con_driver - unbind a console driver
3093  * @csw: pointer to console driver to unregister
3094  * @first: first in range of consoles that @csw should be unbound from
3095  * @last: last in range of consoles that @csw should be unbound from
3096  * @deflt: should next bound console driver be default after @csw is unbound?
3097  *
3098  * To unbind a driver from all possible consoles, pass 0 as @first and
3099  * %MAX_NR_CONSOLES as @last.
3100  *
3101  * @deflt controls whether the console that ends up replacing @csw should be
3102  * the default console.
3103  *
3104  * RETURNS:
3105  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3106  * or 0 on success.
3107  */
3108 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3109 {
3110         struct module *owner = csw->owner;
3111         const struct consw *defcsw = NULL;
3112         struct con_driver *con_driver = NULL, *con_back = NULL;
3113         int i, retval = -ENODEV;
3114
3115         if (!try_module_get(owner))
3116                 return -ENODEV;
3117
3118         acquire_console_sem();
3119
3120         /* check if driver is registered and if it is unbindable */
3121         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3122                 con_driver = &registered_con_driver[i];
3123
3124                 if (con_driver->con == csw &&
3125                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3126                         retval = 0;
3127                         break;
3128                 }
3129         }
3130
3131         if (retval) {
3132                 release_console_sem();
3133                 goto err;
3134         }
3135
3136         retval = -ENODEV;
3137
3138         /* check if backup driver exists */
3139         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3140                 con_back = &registered_con_driver[i];
3141
3142                 if (con_back->con &&
3143                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3144                         defcsw = con_back->con;
3145                         retval = 0;
3146                         break;
3147                 }
3148         }
3149
3150         if (retval) {
3151                 release_console_sem();
3152                 goto err;
3153         }
3154
3155         if (!con_is_bound(csw)) {
3156                 release_console_sem();
3157                 goto err;
3158         }
3159
3160         first = max(first, con_driver->first);
3161         last = min(last, con_driver->last);
3162
3163         for (i = first; i <= last; i++) {
3164                 if (con_driver_map[i] == csw) {
3165                         module_put(csw->owner);
3166                         con_driver_map[i] = NULL;
3167                 }
3168         }
3169
3170         if (!con_is_bound(defcsw)) {
3171                 const struct consw *defconsw = conswitchp;
3172
3173                 defcsw->con_startup();
3174                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3175                 /*
3176                  * vgacon may change the default driver to point
3177                  * to dummycon, we restore it here...
3178                  */
3179                 conswitchp = defconsw;
3180         }
3181
3182         if (!con_is_bound(csw))
3183                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3184
3185         release_console_sem();
3186         /* ignore return value, binding should not fail */
3187         bind_con_driver(defcsw, first, last, deflt);
3188 err:
3189         module_put(owner);
3190         return retval;
3191
3192 }
3193 EXPORT_SYMBOL(unbind_con_driver);
3194
3195 static int vt_bind(struct con_driver *con)
3196 {
3197         const struct consw *defcsw = NULL, *csw = NULL;
3198         int i, more = 1, first = -1, last = -1, deflt = 0;
3199
3200         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3201             con_is_graphics(con->con, con->first, con->last))
3202                 goto err;
3203
3204         csw = con->con;
3205
3206         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3207                 struct con_driver *con = &registered_con_driver[i];
3208
3209                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3210                         defcsw = con->con;
3211                         break;
3212                 }
3213         }
3214
3215         if (!defcsw)
3216                 goto err;
3217
3218         while (more) {
3219                 more = 0;
3220
3221                 for (i = con->first; i <= con->last; i++) {
3222                         if (con_driver_map[i] == defcsw) {
3223                                 if (first == -1)
3224                                         first = i;
3225                                 last = i;
3226                                 more = 1;
3227                         } else if (first != -1)
3228                                 break;
3229                 }
3230
3231                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3232                         deflt = 1;
3233
3234                 if (first != -1)
3235                         bind_con_driver(csw, first, last, deflt);
3236
3237                 first = -1;
3238                 last = -1;
3239                 deflt = 0;
3240         }
3241
3242 err:
3243         return 0;
3244 }
3245
3246 static int vt_unbind(struct con_driver *con)
3247 {
3248         const struct consw *csw = NULL;
3249         int i, more = 1, first = -1, last = -1, deflt = 0;
3250
3251         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3252             con_is_graphics(con->con, con->first, con->last))
3253                 goto err;
3254
3255         csw = con->con;
3256
3257         while (more) {
3258                 more = 0;
3259
3260                 for (i = con->first; i <= con->last; i++) {
3261                         if (con_driver_map[i] == csw) {
3262                                 if (first == -1)
3263                                         first = i;
3264                                 last = i;
3265                                 more = 1;
3266                         } else if (first != -1)
3267                                 break;
3268                 }
3269
3270                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3271                         deflt = 1;
3272
3273                 if (first != -1)
3274                         unbind_con_driver(csw, first, last, deflt);
3275
3276                 first = -1;
3277                 last = -1;
3278                 deflt = 0;
3279         }
3280
3281 err:
3282         return 0;
3283 }
3284 #else
3285 static inline int vt_bind(struct con_driver *con)
3286 {
3287         return 0;
3288 }
3289 static inline int vt_unbind(struct con_driver *con)
3290 {
3291         return 0;
3292 }
3293 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3294
3295 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3296                           const char *buf, size_t count)
3297 {
3298         struct con_driver *con = dev_get_drvdata(dev);
3299         int bind = simple_strtoul(buf, NULL, 0);
3300
3301         if (bind)
3302                 vt_bind(con);
3303         else
3304                 vt_unbind(con);
3305
3306         return count;
3307 }
3308
3309 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3310                          char *buf)
3311 {
3312         struct con_driver *con = dev_get_drvdata(dev);
3313         int bind = con_is_bound(con->con);
3314
3315         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3316 }
3317
3318 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3319                          char *buf)
3320 {
3321         struct con_driver *con = dev_get_drvdata(dev);
3322
3323         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3324                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3325                          con->desc);
3326
3327 }
3328
3329 static struct device_attribute device_attrs[] = {
3330         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3331         __ATTR(name, S_IRUGO, show_name, NULL),
3332 };
3333
3334 static int vtconsole_init_device(struct con_driver *con)
3335 {
3336         int i;
3337         int error = 0;
3338
3339         con->flag |= CON_DRIVER_FLAG_ATTR;
3340         dev_set_drvdata(con->dev, con);
3341         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3342                 error = device_create_file(con->dev, &device_attrs[i]);
3343                 if (error)
3344                         break;
3345         }
3346
3347         if (error) {
3348                 while (--i >= 0)
3349                         device_remove_file(con->dev, &device_attrs[i]);
3350                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3351         }
3352
3353         return error;
3354 }
3355
3356 static void vtconsole_deinit_device(struct con_driver *con)
3357 {
3358         int i;
3359
3360         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3361                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3362                         device_remove_file(con->dev, &device_attrs[i]);
3363                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3364         }
3365 }
3366
3367 /**
3368  * con_is_bound - checks if driver is bound to the console
3369  * @csw: console driver
3370  *
3371  * RETURNS: zero if unbound, nonzero if bound
3372  *
3373  * Drivers can call this and if zero, they should release
3374  * all resources allocated on con_startup()
3375  */
3376 int con_is_bound(const struct consw *csw)
3377 {
3378         int i, bound = 0;
3379
3380         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3381                 if (con_driver_map[i] == csw) {
3382                         bound = 1;
3383                         break;
3384                 }
3385         }
3386
3387         return bound;
3388 }
3389 EXPORT_SYMBOL(con_is_bound);
3390
3391 /**
3392  * register_con_driver - register console driver to console layer
3393  * @csw: console driver
3394  * @first: the first console to take over, minimum value is 0
3395  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3396  *
3397  * DESCRIPTION: This function registers a console driver which can later
3398  * bind to a range of consoles specified by @first and @last. It will
3399  * also initialize the console driver by calling con_startup().
3400  */
3401 int register_con_driver(const struct consw *csw, int first, int last)
3402 {
3403         struct module *owner = csw->owner;
3404         struct con_driver *con_driver;
3405         const char *desc;
3406         int i, retval = 0;
3407
3408         if (!try_module_get(owner))
3409                 return -ENODEV;
3410
3411         acquire_console_sem();
3412
3413         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3414                 con_driver = &registered_con_driver[i];
3415
3416                 /* already registered */
3417                 if (con_driver->con == csw)
3418                         retval = -EINVAL;
3419         }
3420
3421         if (retval)
3422                 goto err;
3423
3424         desc = csw->con_startup();
3425
3426         if (!desc)
3427                 goto err;
3428
3429         retval = -EINVAL;
3430
3431         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3432                 con_driver = &registered_con_driver[i];
3433
3434                 if (con_driver->con == NULL) {
3435                         con_driver->con = csw;
3436                         con_driver->desc = desc;
3437                         con_driver->node = i;
3438                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3439                                            CON_DRIVER_FLAG_INIT;
3440                         con_driver->first = first;
3441                         con_driver->last = last;
3442                         retval = 0;
3443                         break;
3444                 }
3445         }
3446
3447         if (retval)
3448                 goto err;
3449
3450         con_driver->dev = device_create(vtconsole_class, NULL,
3451                                                 MKDEV(0, con_driver->node),
3452                                                 NULL, "vtcon%i",
3453                                                 con_driver->node);
3454
3455         if (IS_ERR(con_driver->dev)) {
3456                 printk(KERN_WARNING "Unable to create device for %s; "
3457                        "errno = %ld\n", con_driver->desc,
3458                        PTR_ERR(con_driver->dev));
3459                 con_driver->dev = NULL;
3460         } else {
3461                 vtconsole_init_device(con_driver);
3462         }
3463
3464 err:
3465         release_console_sem();
3466         module_put(owner);
3467         return retval;
3468 }
3469 EXPORT_SYMBOL(register_con_driver);
3470
3471 /**
3472  * unregister_con_driver - unregister console driver from console layer
3473  * @csw: console driver
3474  *
3475  * DESCRIPTION: All drivers that registers to the console layer must
3476  * call this function upon exit, or if the console driver is in a state
3477  * where it won't be able to handle console services, such as the
3478  * framebuffer console without loaded framebuffer drivers.
3479  *
3480  * The driver must unbind first prior to unregistration.
3481  */
3482 int unregister_con_driver(const struct consw *csw)
3483 {
3484         int i, retval = -ENODEV;
3485
3486         acquire_console_sem();
3487
3488         /* cannot unregister a bound driver */
3489         if (con_is_bound(csw))
3490                 goto err;
3491
3492         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3493                 struct con_driver *con_driver = &registered_con_driver[i];
3494
3495                 if (con_driver->con == csw &&
3496                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3497                         vtconsole_deinit_device(con_driver);
3498                         device_destroy(vtconsole_class,
3499                                        MKDEV(0, con_driver->node));
3500                         con_driver->con = NULL;
3501                         con_driver->desc = NULL;
3502                         con_driver->dev = NULL;
3503                         con_driver->node = 0;
3504                         con_driver->flag = 0;
3505                         con_driver->first = 0;
3506                         con_driver->last = 0;
3507                         retval = 0;
3508                         break;
3509                 }
3510         }
3511 err:
3512         release_console_sem();
3513         return retval;
3514 }
3515 EXPORT_SYMBOL(unregister_con_driver);
3516
3517 /*
3518  *      If we support more console drivers, this function is used
3519  *      when a driver wants to take over some existing consoles
3520  *      and become default driver for newly opened ones.
3521  *
3522  *      take_over_console is basically a register followed by unbind
3523  */
3524 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3525 {
3526         int err;
3527
3528         err = register_con_driver(csw, first, last);
3529
3530         if (!err)
3531                 bind_con_driver(csw, first, last, deflt);
3532
3533         return err;
3534 }
3535
3536 /*
3537  * give_up_console is a wrapper to unregister_con_driver. It will only
3538  * work if driver is fully unbound.
3539  */
3540 void give_up_console(const struct consw *csw)
3541 {
3542         unregister_con_driver(csw);
3543 }
3544
3545 static int __init vtconsole_class_init(void)
3546 {
3547         int i;
3548
3549         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3550         if (IS_ERR(vtconsole_class)) {
3551                 printk(KERN_WARNING "Unable to create vt console class; "
3552                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3553                 vtconsole_class = NULL;
3554         }
3555
3556         /* Add system drivers to sysfs */
3557         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3558                 struct con_driver *con = &registered_con_driver[i];
3559
3560                 if (con->con && !con->dev) {
3561                         con->dev = device_create(vtconsole_class, NULL,
3562                                                          MKDEV(0, con->node),
3563                                                          NULL, "vtcon%i",
3564                                                          con->node);
3565
3566                         if (IS_ERR(con->dev)) {
3567                                 printk(KERN_WARNING "Unable to create "
3568                                        "device for %s; errno = %ld\n",
3569                                        con->desc, PTR_ERR(con->dev));
3570                                 con->dev = NULL;
3571                         } else {
3572                                 vtconsole_init_device(con);
3573                         }
3574                 }
3575         }
3576
3577         return 0;
3578 }
3579 postcore_initcall(vtconsole_class_init);
3580
3581 #endif
3582
3583 /*
3584  *      Screen blanking
3585  */
3586
3587 static int set_vesa_blanking(char __user *p)
3588 {
3589         unsigned int mode;
3590
3591         if (get_user(mode, p + 1))
3592                 return -EFAULT;
3593
3594         vesa_blank_mode = (mode < 4) ? mode : 0;
3595         return 0;
3596 }
3597
3598 void do_blank_screen(int entering_gfx)
3599 {
3600         struct vc_data *vc = vc_cons[fg_console].d;
3601         int i;
3602
3603         WARN_CONSOLE_UNLOCKED();
3604
3605         if (console_blanked) {
3606                 if (blank_state == blank_vesa_wait) {
3607                         blank_state = blank_off;
3608                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3609                 }
3610                 return;
3611         }
3612
3613         /* entering graphics mode? */
3614         if (entering_gfx) {
3615                 hide_cursor(vc);
3616                 save_screen(vc);
3617                 vc->vc_sw->con_blank(vc, -1, 1);
3618                 console_blanked = fg_console + 1;
3619                 blank_state = blank_off;
3620                 set_origin(vc);
3621                 return;
3622         }
3623
3624         if (blank_state != blank_normal_wait)
3625                 return;
3626         blank_state = blank_off;
3627
3628         /* don't blank graphics */
3629         if (vc->vc_mode != KD_TEXT) {
3630                 console_blanked = fg_console + 1;
3631                 return;
3632         }
3633
3634         hide_cursor(vc);
3635         del_timer_sync(&console_timer);
3636         blank_timer_expired = 0;
3637
3638         save_screen(vc);
3639         /* In case we need to reset origin, blanking hook returns 1 */
3640         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3641         console_blanked = fg_console + 1;
3642         if (i)
3643                 set_origin(vc);
3644
3645         if (console_blank_hook && console_blank_hook(1))
3646                 return;
3647
3648         if (vesa_off_interval && vesa_blank_mode) {
3649                 blank_state = blank_vesa_wait;
3650                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3651         }
3652 }
3653 EXPORT_SYMBOL(do_blank_screen);
3654
3655 /*
3656  * Called by timer as well as from vt_console_driver
3657  */
3658 void do_unblank_screen(int leaving_gfx)
3659 {
3660         struct vc_data *vc;
3661
3662         /* This should now always be called from a "sane" (read: can schedule)
3663          * context for the sake of the low level drivers, except in the special
3664          * case of oops_in_progress
3665          */
3666         if (!oops_in_progress)
3667                 might_sleep();
3668
3669         WARN_CONSOLE_UNLOCKED();
3670
3671         ignore_poke = 0;
3672         if (!console_blanked)
3673                 return;
3674         if (!vc_cons_allocated(fg_console)) {
3675                 /* impossible */
3676                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3677                 return;
3678         }
3679         vc = vc_cons[fg_console].d;
3680         if (vc->vc_mode != KD_TEXT)
3681                 return; /* but leave console_blanked != 0 */
3682
3683         if (blankinterval) {
3684                 mod_timer(&console_timer, jiffies + blankinterval);
3685                 blank_state = blank_normal_wait;
3686         }
3687
3688         console_blanked = 0;
3689         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3690                 /* Low-level driver cannot restore -> do it ourselves */
3691                 update_screen(vc);
3692         if (console_blank_hook)
3693                 console_blank_hook(0);
3694         set_palette(vc);
3695         set_cursor(vc);
3696 }
3697 EXPORT_SYMBOL(do_unblank_screen);
3698
3699 /*
3700  * This is called by the outside world to cause a forced unblank, mostly for
3701  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3702  * call it with 1 as an argument and so force a mode restore... that may kill
3703  * X or at least garbage the screen but would also make the Oops visible...
3704  */
3705 void unblank_screen(void)
3706 {
3707         do_unblank_screen(0);
3708 }
3709
3710 /*
3711  * We defer the timer blanking to work queue so it can take the console mutex
3712  * (console operations can still happen at irq time, but only from printk which
3713  * has the console mutex. Not perfect yet, but better than no locking
3714  */
3715 static void blank_screen_t(unsigned long dummy)
3716 {
3717         if (unlikely(!keventd_up())) {
3718                 mod_timer(&console_timer, jiffies + blankinterval);
3719                 return;
3720         }
3721         blank_timer_expired = 1;
3722         schedule_work(&console_work);
3723 }
3724
3725 void poke_blanked_console(void)
3726 {
3727         WARN_CONSOLE_UNLOCKED();
3728
3729         /* Add this so we quickly catch whoever might call us in a non
3730          * safe context. Nowadays, unblank_screen() isn't to be called in
3731          * atomic contexts and is allowed to schedule (with the special case
3732          * of oops_in_progress, but that isn't of any concern for this
3733          * function. --BenH.
3734          */
3735         might_sleep();
3736
3737         /* This isn't perfectly race free, but a race here would be mostly harmless,
3738          * at worse, we'll do a spurrious blank and it's unlikely
3739          */
3740         del_timer(&console_timer);
3741         blank_timer_expired = 0;
3742
3743         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3744                 return;
3745         if (console_blanked)
3746                 unblank_screen();
3747         else if (blankinterval) {
3748                 mod_timer(&console_timer, jiffies + blankinterval);
3749                 blank_state = blank_normal_wait;
3750         }
3751 }
3752
3753 /*
3754  *      Palettes
3755  */
3756
3757 static void set_palette(struct vc_data *vc)
3758 {
3759         WARN_CONSOLE_UNLOCKED();
3760
3761         if (vc->vc_mode != KD_GRAPHICS)
3762                 vc->vc_sw->con_set_palette(vc, color_table);
3763 }
3764
3765 static int set_get_cmap(unsigned char __user *arg, int set)
3766 {
3767     int i, j, k;
3768
3769     WARN_CONSOLE_UNLOCKED();
3770
3771     for (i = 0; i < 16; i++)
3772         if (set) {
3773             get_user(default_red[i], arg++);
3774             get_user(default_grn[i], arg++);
3775             get_user(default_blu[i], arg++);
3776         } else {
3777             put_user(default_red[i], arg++);
3778             put_user(default_grn[i], arg++);
3779             put_user(default_blu[i], arg++);
3780         }
3781     if (set) {
3782         for (i = 0; i < MAX_NR_CONSOLES; i++)
3783             if (vc_cons_allocated(i)) {
3784                 for (j = k = 0; j < 16; j++) {
3785                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3786                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3787                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3788                 }
3789                 set_palette(vc_cons[i].d);
3790             }
3791     }
3792     return 0;
3793 }
3794
3795 /*
3796  * Load palette into the DAC registers. arg points to a colour
3797  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3798  */
3799
3800 int con_set_cmap(unsigned char __user *arg)
3801 {
3802         int rc;
3803
3804         acquire_console_sem();
3805         rc = set_get_cmap (arg,1);
3806         release_console_sem();
3807
3808         return rc;
3809 }
3810
3811 int con_get_cmap(unsigned char __user *arg)
3812 {
3813         int rc;
3814
3815         acquire_console_sem();
3816         rc = set_get_cmap (arg,0);
3817         release_console_sem();
3818
3819         return rc;
3820 }
3821
3822 void reset_palette(struct vc_data *vc)
3823 {
3824         int j, k;
3825         for (j=k=0; j<16; j++) {
3826                 vc->vc_palette[k++] = default_red[j];
3827                 vc->vc_palette[k++] = default_grn[j];
3828                 vc->vc_palette[k++] = default_blu[j];
3829         }
3830         set_palette(vc);
3831 }
3832
3833 /*
3834  *  Font switching
3835  *
3836  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3837  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3838  *  depending on width) reserved for each character which is kinda wasty, but
3839  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3840  *  is upto the actual low-level console-driver convert data into its favorite
3841  *  format (maybe we should add a `fontoffset' field to the `display'
3842  *  structure so we won't have to convert the fontdata all the time.
3843  *  /Jes
3844  */
3845
3846 #define max_font_size 65536
3847
3848 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3849 {
3850         struct console_font font;
3851         int rc = -EINVAL;
3852         int c;
3853
3854         if (vc->vc_mode != KD_TEXT)
3855                 return -EINVAL;
3856
3857         if (op->data) {
3858                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3859                 if (!font.data)
3860                         return -ENOMEM;
3861         } else
3862                 font.data = NULL;
3863
3864         acquire_console_sem();
3865         if (vc->vc_sw->con_font_get)
3866                 rc = vc->vc_sw->con_font_get(vc, &font);
3867         else
3868                 rc = -ENOSYS;
3869         release_console_sem();
3870
3871         if (rc)
3872                 goto out;
3873
3874         c = (font.width+7)/8 * 32 * font.charcount;
3875
3876         if (op->data && font.charcount > op->charcount)
3877                 rc = -ENOSPC;
3878         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3879                 if (font.width > op->width || font.height > op->height)
3880                         rc = -ENOSPC;
3881         } else {
3882                 if (font.width != 8)
3883                         rc = -EIO;
3884                 else if ((op->height && font.height > op->height) ||
3885                          font.height > 32)
3886                         rc = -ENOSPC;
3887         }
3888         if (rc)
3889                 goto out;
3890
3891         op->height = font.height;
3892         op->width = font.width;
3893         op->charcount = font.charcount;
3894
3895         if (op->data && copy_to_user(op->data, font.data, c))
3896                 rc = -EFAULT;
3897
3898 out:
3899         kfree(font.data);
3900         return rc;
3901 }
3902
3903 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3904 {
3905         struct console_font font;
3906         int rc = -EINVAL;
3907         int size;
3908
3909         if (vc->vc_mode != KD_TEXT)
3910                 return -EINVAL;
3911         if (!op->data)
3912                 return -EINVAL;
3913         if (op->charcount > 512)
3914                 return -EINVAL;
3915         if (!op->height) {              /* Need to guess font height [compat] */
3916                 int h, i;
3917                 u8 __user *charmap = op->data;
3918                 u8 tmp;
3919
3920                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3921                    so that we can get rid of this soon */
3922                 if (!(op->flags & KD_FONT_FLAG_OLD))
3923                         return -EINVAL;
3924                 for (h = 32; h > 0; h--)
3925                         for (i = 0; i < op->charcount; i++) {
3926                                 if (get_user(tmp, &charmap[32*i+h-1]))
3927                                         return -EFAULT;
3928                                 if (tmp)
3929                                         goto nonzero;
3930                         }
3931                 return -EINVAL;
3932         nonzero:
3933                 op->height = h;
3934         }
3935         if (op->width <= 0 || op->width > 32 || op->height > 32)
3936                 return -EINVAL;
3937         size = (op->width+7)/8 * 32 * op->charcount;
3938         if (size > max_font_size)
3939                 return -ENOSPC;
3940         font.charcount = op->charcount;
3941         font.height = op->height;
3942         font.width = op->width;
3943         font.data = kmalloc(size, GFP_KERNEL);
3944         if (!font.data)
3945                 return -ENOMEM;
3946         if (copy_from_user(font.data, op->data, size)) {
3947                 kfree(font.data);
3948                 return -EFAULT;
3949         }
3950         acquire_console_sem();
3951         if (vc->vc_sw->con_font_set)
3952                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3953         else
3954                 rc = -ENOSYS;
3955         release_console_sem();
3956         kfree(font.data);
3957         return rc;
3958 }
3959
3960 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3961 {
3962         struct console_font font = {.width = op->width, .height = op->height};
3963         char name[MAX_FONT_NAME];
3964         char *s = name;
3965         int rc;
3966
3967         if (vc->vc_mode != KD_TEXT)
3968                 return -EINVAL;
3969
3970         if (!op->data)
3971                 s = NULL;
3972         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3973                 return -EFAULT;
3974         else
3975                 name[MAX_FONT_NAME - 1] = 0;
3976
3977         acquire_console_sem();
3978         if (vc->vc_sw->con_font_default)
3979                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3980         else
3981                 rc = -ENOSYS;
3982         release_console_sem();
3983         if (!rc) {
3984                 op->width = font.width;
3985                 op->height = font.height;
3986         }
3987         return rc;
3988 }
3989
3990 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3991 {
3992         int con = op->height;
3993         int rc;
3994
3995         if (vc->vc_mode != KD_TEXT)
3996                 return -EINVAL;
3997
3998         acquire_console_sem();
3999         if (!vc->vc_sw->con_font_copy)
4000                 rc = -ENOSYS;
4001         else if (con < 0 || !vc_cons_allocated(con))
4002                 rc = -ENOTTY;
4003         else if (con == vc->vc_num)     /* nothing to do */
4004                 rc = 0;
4005         else
4006                 rc = vc->vc_sw->con_font_copy(vc, con);
4007         release_console_sem();
4008         return rc;
4009 }
4010
4011 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4012 {
4013         switch (op->op) {
4014         case KD_FONT_OP_SET:
4015                 return con_font_set(vc, op);
4016         case KD_FONT_OP_GET:
4017                 return con_font_get(vc, op);
4018         case KD_FONT_OP_SET_DEFAULT:
4019                 return con_font_default(vc, op);
4020         case KD_FONT_OP_COPY:
4021                 return con_font_copy(vc, op);
4022         }
4023         return -ENOSYS;
4024 }
4025
4026 /*
4027  *      Interface exported to selection and vcs.
4028  */
4029
4030 /* used by selection */
4031 u16 screen_glyph(struct vc_data *vc, int offset)
4032 {
4033         u16 w = scr_readw(screenpos(vc, offset, 1));
4034         u16 c = w & 0xff;
4035
4036         if (w & vc->vc_hi_font_mask)
4037                 c |= 0x100;
4038         return c;
4039 }
4040 EXPORT_SYMBOL_GPL(screen_glyph);
4041
4042 /* used by vcs - note the word offset */
4043 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4044 {
4045         return screenpos(vc, 2 * w_offset, viewed);
4046 }
4047
4048 void getconsxy(struct vc_data *vc, unsigned char *p)
4049 {
4050         p[0] = vc->vc_x;
4051         p[1] = vc->vc_y;
4052 }
4053
4054 void putconsxy(struct vc_data *vc, unsigned char *p)
4055 {
4056         hide_cursor(vc);
4057         gotoxy(vc, p[0], p[1]);
4058         set_cursor(vc);
4059 }
4060
4061 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4062 {
4063         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4064                 return softcursor_original;
4065         return scr_readw(org);
4066 }
4067
4068 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4069 {
4070         scr_writew(val, org);
4071         if ((unsigned long)org == vc->vc_pos) {
4072                 softcursor_original = -1;
4073                 add_softcursor(vc);
4074         }
4075 }
4076
4077 /*
4078  *      Visible symbols for modules
4079  */
4080
4081 EXPORT_SYMBOL(color_table);
4082 EXPORT_SYMBOL(default_red);
4083 EXPORT_SYMBOL(default_grn);
4084 EXPORT_SYMBOL(default_blu);
4085 EXPORT_SYMBOL(update_region);
4086 EXPORT_SYMBOL(redraw_screen);
4087 EXPORT_SYMBOL(vc_resize);
4088 EXPORT_SYMBOL(fg_console);
4089 EXPORT_SYMBOL(console_blank_hook);
4090 EXPORT_SYMBOL(console_blanked);
4091 EXPORT_SYMBOL(vc_cons);
4092 #ifndef VT_SINGLE_DRIVER
4093 EXPORT_SYMBOL(take_over_console);
4094 EXPORT_SYMBOL(give_up_console);
4095 #endif