err.no Git - linux-2.6/blob - drivers/char/vt.c

   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton <andrewm@uow.edu.au>
  63  *
  64  * Removed console_lock, enabled interrupts across all console operations
  65  * 13 March 2001, Andrew Morton
  66  *
  67  * Fixed UTF-8 mode so alternate charset modes always work according
  68  * to control sequences interpreted in do_con_trol function
  69  * preserving backward VT100 semigraphics compatibility,
  70  * malformed UTF sequences represented as sequences of replacement glyphs,
  71  * original codes or '?' as a last resort if replacement glyph is undefined
  72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  73  */
  74
  75 #include <linux/module.h>
  76 #include <linux/types.h>
  77 #include <linux/sched.h>
  78 #include <linux/tty.h>
  79 #include <linux/tty_flip.h>
  80 #include <linux/kernel.h>
  81 #include <linux/string.h>
  82 #include <linux/errno.h>
  83 #include <linux/kd.h>
  84 #include <linux/slab.h>
  85 #include <linux/major.h>
  86 #include <linux/mm.h>
  87 #include <linux/console.h>
  88 #include <linux/init.h>
  89 #include <linux/mutex.h>
  90 #include <linux/vt_kern.h>
  91 #include <linux/selection.h>
  92 #include <linux/tiocl.h>
  93 #include <linux/kbd_kern.h>
  94 #include <linux/consolemap.h>
  95 #include <linux/timer.h>
  96 #include <linux/interrupt.h>
  97 #include <linux/workqueue.h>
  98 #include <linux/bootmem.h>
  99 #include <linux/pm.h>
 100 #include <linux/font.h>
 101 #include <linux/bitops.h>
 102 #include <linux/notifier.h>
 103
 104 #include <asm/io.h>
 105 #include <asm/system.h>
 106 #include <asm/uaccess.h>
 107
 108 #define MAX_NR_CON_DRIVER 16
 109
 110 #define CON_DRIVER_FLAG_MODULE 1
 111 #define CON_DRIVER_FLAG_INIT   2
 112 #define CON_DRIVER_FLAG_ATTR   4
 113
 114 struct con_driver {
 115         const struct consw *con;
 116         const char *desc;
 117         struct device *dev;
 118         int node;
 119         int first;
 120         int last;
 121         int flag;
 122 };
 123
 124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 125 const struct consw *conswitchp;
 126
 127 /* A bitmap for codes <32. A bit of 1 indicates that the code
 128  * corresponding to that bit number invokes some special action
 129  * (such as cursor movement) and should not be displayed as a
 130  * glyph unless the disp_ctrl mode is explicitly enabled.
 131  */
 132 #define CTRL_ACTION 0x0d00ff81
 133 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 134
 135 /*
 136  * Here is the default bell parameters: 750HZ, 1/8th of a second
 137  */
 138 #define DEFAULT_BELL_PITCH      750
 139 #define DEFAULT_BELL_DURATION   (HZ/8)
 140
 141 struct vc vc_cons [MAX_NR_CONSOLES];
 142
 143 #ifndef VT_SINGLE_DRIVER
 144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 145 #endif
 146
 147 static int con_open(struct tty_struct *, struct file *);
 148 static void vc_init(struct vc_data *vc, unsigned int rows,
 149                     unsigned int cols, int do_clear);
 150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 151 static void save_cur(struct vc_data *vc);
 152 static void reset_terminal(struct vc_data *vc, int do_clear);
 153 static void con_flush_chars(struct tty_struct *tty);
 154 static int set_vesa_blanking(char __user *p);
 155 static void set_cursor(struct vc_data *vc);
 156 static void hide_cursor(struct vc_data *vc);
 157 static void console_callback(struct work_struct *ignored);
 158 static void blank_screen_t(unsigned long dummy);
 159 static void set_palette(struct vc_data *vc);
 160
 161 static int printable;           /* Is console ready for printing? */
 162 int default_utf8 = true;
 163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 164
 165 /*
 166  * ignore_poke: don't unblank the screen when things are typed.  This is
 167  * mainly for the privacy of braille terminal users.
 168  */
 169 static int ignore_poke;
 170
 171 int do_poke_blanked_console;
 172 int console_blanked;
 173
 174 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 175 static int blankinterval = 10*60*HZ;
 176 static int vesa_off_interval;
 177
 178 static DECLARE_WORK(console_work, console_callback);
 179
 180 /*
 181  * fg_console is the current virtual console,
 182  * last_console is the last used one,
 183  * want_console is the console we want to switch to,
 184  * kmsg_redirect is the console for kernel messages,
 185  */
 186 int fg_console;
 187 int last_console;
 188 int want_console = -1;
 189 int kmsg_redirect;
 190
 191 /*
 192  * For each existing display, we have a pointer to console currently visible
 193  * on that display, allowing consoles other than fg_console to be refreshed
 194  * appropriately. Unless the low-level driver supplies its own display_fg
 195  * variable, we use this one for the "master display".
 196  */
 197 static struct vc_data *master_display_fg;
 198
 199 /*
 200  * Unfortunately, we need to delay tty echo when we're currently writing to the
 201  * console since the code is (and always was) not re-entrant, so we schedule
 202  * all flip requests to process context with schedule-task() and run it from
 203  * console_callback().
 204  */
 205
 206 /*
 207  * For the same reason, we defer scrollback to the console callback.
 208  */
 209 static int scrollback_delta;
 210
 211 /*
 212  * Hook so that the power management routines can (un)blank
 213  * the console on our behalf.
 214  */
 215 int (*console_blank_hook)(int);
 216
 217 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 218 static int blank_state;
 219 static int blank_timer_expired;
 220 enum {
 221         blank_off = 0,
 222         blank_normal_wait,
 223         blank_vesa_wait,
 224 };
 225
 226 /*
 227  * Notifier list for console events.
 228  */
 229 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 230
 231 int register_vt_notifier(struct notifier_block *nb)
 232 {
 233         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 234 }
 235 EXPORT_SYMBOL_GPL(register_vt_notifier);
 236
 237 int unregister_vt_notifier(struct notifier_block *nb)
 238 {
 239         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 240 }
 241 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 242
 243 static void notify_write(struct vc_data *vc, unsigned int unicode)
 244 {
 245         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 246         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 247 }
 248
 249 static void notify_update(struct vc_data *vc)
 250 {
 251         struct vt_notifier_param param = { .vc = vc };
 252         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 253 }
 254
 255 /*
 256  *      Low-Level Functions
 257  */
 258
 259 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 260
 261 #ifdef VT_BUF_VRAM_ONLY
 262 #define DO_UPDATE(vc)   0
 263 #else
 264 #define DO_UPDATE(vc)   CON_IS_VISIBLE(vc)
 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_scrl_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_scrl_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         vc->vc_scrl_erase_char = (build_attr(vc, vc->vc_def_color, 1, false, false, false, false) << 8) | ' ';
 438 }
 439
 440 /* Note: inverting the screen twice should revert to the original state */
 441 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 442 {
 443         unsigned short *p;
 444
 445         WARN_CONSOLE_UNLOCKED();
 446
 447         count /= 2;
 448         p = screenpos(vc, offset, viewed);
 449         if (vc->vc_sw->con_invert_region)
 450                 vc->vc_sw->con_invert_region(vc, p, count);
 451 #ifndef VT_BUF_VRAM_ONLY
 452         else {
 453                 u16 *q = p;
 454                 int cnt = count;
 455                 u16 a;
 456
 457                 if (!vc->vc_can_do_color) {
 458                         while (cnt--) {
 459                             a = scr_readw(q);
 460                             a ^= 0x0800;
 461                             scr_writew(a, q);
 462                             q++;
 463                         }
 464                 } else if (vc->vc_hi_font_mask == 0x100) {
 465                         while (cnt--) {
 466                                 a = scr_readw(q);
 467                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 468                                 scr_writew(a, q);
 469                                 q++;
 470                         }
 471                 } else {
 472                         while (cnt--) {
 473                                 a = scr_readw(q);
 474                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 475                                 scr_writew(a, q);
 476                                 q++;
 477                         }
 478                 }
 479         }
 480 #endif
 481         if (DO_UPDATE(vc))
 482                 do_update_region(vc, (unsigned long) p, count);
 483 }
 484
 485 /* used by selection: complement pointer position */
 486 void complement_pos(struct vc_data *vc, int offset)
 487 {
 488         static int old_offset = -1;
 489         static unsigned short old;
 490         static unsigned short oldx, oldy;
 491
 492         WARN_CONSOLE_UNLOCKED();
 493
 494         if (old_offset != -1 && old_offset >= 0 &&
 495             old_offset < vc->vc_screenbuf_size) {
 496                 scr_writew(old, screenpos(vc, old_offset, 1));
 497                 if (DO_UPDATE(vc))
 498                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 499         }
 500
 501         old_offset = offset;
 502
 503         if (offset != -1 && offset >= 0 &&
 504             offset < vc->vc_screenbuf_size) {
 505                 unsigned short new;
 506                 unsigned short *p;
 507                 p = screenpos(vc, offset, 1);
 508                 old = scr_readw(p);
 509                 new = old ^ vc->vc_complement_mask;
 510                 scr_writew(new, p);
 511                 if (DO_UPDATE(vc)) {
 512                         oldx = (offset >> 1) % vc->vc_cols;
 513                         oldy = (offset >> 1) / vc->vc_cols;
 514                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 515                 }
 516         }
 517
 518 }
 519
 520 static void insert_char(struct vc_data *vc, unsigned int nr)
 521 {
 522         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 523
 524         p = q + vc->vc_cols - nr - vc->vc_x;
 525         while (--p >= q)
 526                 scr_writew(scr_readw(p), p + nr);
 527         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 528         vc->vc_need_wrap = 0;
 529         if (DO_UPDATE(vc)) {
 530                 unsigned short oldattr = vc->vc_attr;
 531                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 532                                      vc->vc_cols - vc->vc_x - nr);
 533                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 534                 while (nr--)
 535                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 536                 vc->vc_attr = oldattr;
 537         }
 538 }
 539
 540 static void delete_char(struct vc_data *vc, unsigned int nr)
 541 {
 542         unsigned int i = vc->vc_x;
 543         unsigned short *p = (unsigned short *)vc->vc_pos;
 544
 545         while (++i <= vc->vc_cols - nr) {
 546                 scr_writew(scr_readw(p+nr), p);
 547                 p++;
 548         }
 549         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 550         vc->vc_need_wrap = 0;
 551         if (DO_UPDATE(vc)) {
 552                 unsigned short oldattr = vc->vc_attr;
 553                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 554                                      vc->vc_cols - vc->vc_x - nr);
 555                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 556                 while (nr--)
 557                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 558                                      vc->vc_cols - 1 - nr);
 559                 vc->vc_attr = oldattr;
 560         }
 561 }
 562
 563 static int softcursor_original;
 564
 565 static void add_softcursor(struct vc_data *vc)
 566 {
 567         int i = scr_readw((u16 *) vc->vc_pos);
 568         u32 type = vc->vc_cursor_type;
 569
 570         if (! (type & 0x10)) return;
 571         if (softcursor_original != -1) return;
 572         softcursor_original = i;
 573         i |= ((type >> 8) & 0xff00 );
 574         i ^= ((type) & 0xff00 );
 575         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 576         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 577         scr_writew(i, (u16 *) vc->vc_pos);
 578         if (DO_UPDATE(vc))
 579                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 580 }
 581
 582 static void hide_softcursor(struct vc_data *vc)
 583 {
 584         if (softcursor_original != -1) {
 585                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 586                 if (DO_UPDATE(vc))
 587                         vc->vc_sw->con_putc(vc, softcursor_original,
 588                                         vc->vc_y, vc->vc_x);
 589                 softcursor_original = -1;
 590         }
 591 }
 592
 593 static void hide_cursor(struct vc_data *vc)
 594 {
 595         if (vc == sel_cons)
 596                 clear_selection();
 597         vc->vc_sw->con_cursor(vc, CM_ERASE);
 598         hide_softcursor(vc);
 599 }
 600
 601 static void set_cursor(struct vc_data *vc)
 602 {
 603         if (!IS_FG(vc) || console_blanked ||
 604             vc->vc_mode == KD_GRAPHICS)
 605                 return;
 606         if (vc->vc_deccm) {
 607                 if (vc == sel_cons)
 608                         clear_selection();
 609                 add_softcursor(vc);
 610                 if ((vc->vc_cursor_type & 0x0f) != 1)
 611                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 612         } else
 613                 hide_cursor(vc);
 614 }
 615
 616 static void set_origin(struct vc_data *vc)
 617 {
 618         WARN_CONSOLE_UNLOCKED();
 619
 620         if (!CON_IS_VISIBLE(vc) ||
 621             !vc->vc_sw->con_set_origin ||
 622             !vc->vc_sw->con_set_origin(vc))
 623                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 624         vc->vc_visible_origin = vc->vc_origin;
 625         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 626         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 627 }
 628
 629 static inline void save_screen(struct vc_data *vc)
 630 {
 631         WARN_CONSOLE_UNLOCKED();
 632
 633         if (vc->vc_sw->con_save_screen)
 634                 vc->vc_sw->con_save_screen(vc);
 635 }
 636
 637 /*
 638  *      Redrawing of screen
 639  */
 640
 641 static void clear_buffer_attributes(struct vc_data *vc)
 642 {
 643         unsigned short *p = (unsigned short *)vc->vc_origin;
 644         int count = vc->vc_screenbuf_size / 2;
 645         int mask = vc->vc_hi_font_mask | 0xff;
 646
 647         for (; count > 0; count--, p++) {
 648                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 649         }
 650 }
 651
 652 void redraw_screen(struct vc_data *vc, int is_switch)
 653 {
 654         int redraw = 0;
 655
 656         WARN_CONSOLE_UNLOCKED();
 657
 658         if (!vc) {
 659                 /* strange ... */
 660                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 661                 return;
 662         }
 663
 664         if (is_switch) {
 665                 struct vc_data *old_vc = vc_cons[fg_console].d;
 666                 if (old_vc == vc)
 667                         return;
 668                 if (!CON_IS_VISIBLE(vc))
 669                         redraw = 1;
 670                 *vc->vc_display_fg = vc;
 671                 fg_console = vc->vc_num;
 672                 hide_cursor(old_vc);
 673                 if (!CON_IS_VISIBLE(old_vc)) {
 674                         save_screen(old_vc);
 675                         set_origin(old_vc);
 676                 }
 677         } else {
 678                 hide_cursor(vc);
 679                 redraw = 1;
 680         }
 681
 682         if (redraw) {
 683                 int update;
 684                 int old_was_color = vc->vc_can_do_color;
 685
 686                 set_origin(vc);
 687                 update = vc->vc_sw->con_switch(vc);
 688                 set_palette(vc);
 689                 /*
 690                  * If console changed from mono<->color, the best we can do
 691                  * is to clear the buffer attributes. As it currently stands,
 692                  * rebuilding new attributes from the old buffer is not doable
 693                  * without overly complex code.
 694                  */
 695                 if (old_was_color != vc->vc_can_do_color) {
 696                         update_attr(vc);
 697                         clear_buffer_attributes(vc);
 698                 }
 699                 if (update && vc->vc_mode != KD_GRAPHICS)
 700                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 701         }
 702         set_cursor(vc);
 703         if (is_switch) {
 704                 set_leds();
 705                 compute_shiftstate();
 706                 notify_update(vc);
 707         }
 708 }
 709
 710 /*
 711  *      Allocation, freeing and resizing of VTs.
 712  */
 713
 714 int vc_cons_allocated(unsigned int i)
 715 {
 716         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 717 }
 718
 719 static void visual_init(struct vc_data *vc, int num, int init)
 720 {
 721         /* ++Geert: vc->vc_sw->con_init determines console size */
 722         if (vc->vc_sw)
 723                 module_put(vc->vc_sw->owner);
 724         vc->vc_sw = conswitchp;
 725 #ifndef VT_SINGLE_DRIVER
 726         if (con_driver_map[num])
 727                 vc->vc_sw = con_driver_map[num];
 728 #endif
 729         __module_get(vc->vc_sw->owner);
 730         vc->vc_num = num;
 731         vc->vc_display_fg = &master_display_fg;
 732         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 733         vc->vc_uni_pagedir = 0;
 734         vc->vc_hi_font_mask = 0;
 735         vc->vc_complement_mask = 0;
 736         vc->vc_can_do_color = 0;
 737         vc->vc_sw->con_init(vc, init);
 738         if (!vc->vc_complement_mask)
 739                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 740         vc->vc_s_complement_mask = vc->vc_complement_mask;
 741         vc->vc_size_row = vc->vc_cols << 1;
 742         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 743 }
 744
 745 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 746 {
 747         WARN_CONSOLE_UNLOCKED();
 748
 749         if (currcons >= MAX_NR_CONSOLES)
 750                 return -ENXIO;
 751         if (!vc_cons[currcons].d) {
 752             struct vc_data *vc;
 753             struct vt_notifier_param param;
 754
 755             /* prevent users from taking too much memory */
 756             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 757               return -EPERM;
 758
 759             /* due to the granularity of kmalloc, we waste some memory here */
 760             /* the alloc is done in two steps, to optimize the common situation
 761                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 762             /* although the numbers above are not valid since long ago, the
 763                point is still up-to-date and the comment still has its value
 764                even if only as a historical artifact.  --mj, July 1998 */
 765             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 766             if (!vc)
 767                 return -ENOMEM;
 768             vc_cons[currcons].d = vc;
 769             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 770             visual_init(vc, currcons, 1);
 771             if (!*vc->vc_uni_pagedir_loc)
 772                 con_set_default_unimap(vc);
 773             if (!vc->vc_kmalloced)
 774                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 775             if (!vc->vc_screenbuf) {
 776                 kfree(vc);
 777                 vc_cons[currcons].d = NULL;
 778                 return -ENOMEM;
 779             }
 780             vc->vc_kmalloced = 1;
 781             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 782             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 783         }
 784         return 0;
 785 }
 786
 787 static inline int resize_screen(struct vc_data *vc, int width, int height,
 788                                 int user)
 789 {
 790         /* Resizes the resolution of the display adapater */
 791         int err = 0;
 792
 793         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 794                 err = vc->vc_sw->con_resize(vc, width, height, user);
 795
 796         return err;
 797 }
 798
 799 /*
 800  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 801  * [this is to be used together with some user program
 802  * like resize that changes the hardware videomode]
 803  */
 804 #define VC_RESIZE_MAXCOL (32767)
 805 #define VC_RESIZE_MAXROW (32767)
 806 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 807 {
 808         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 809         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 810         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 811         unsigned int end, user;
 812         unsigned short *newscreen;
 813
 814         WARN_CONSOLE_UNLOCKED();
 815
 816         if (!vc)
 817                 return -ENXIO;
 818
 819         user = vc->vc_resize_user;
 820         vc->vc_resize_user = 0;
 821
 822         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 823                 return -EINVAL;
 824
 825         new_cols = (cols ? cols : vc->vc_cols);
 826         new_rows = (lines ? lines : vc->vc_rows);
 827         new_row_size = new_cols << 1;
 828         new_screen_size = new_row_size * new_rows;
 829
 830         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 831                 return 0;
 832
 833         newscreen = kmalloc(new_screen_size, GFP_USER);
 834         if (!newscreen)
 835                 return -ENOMEM;
 836
 837         old_rows = vc->vc_rows;
 838         old_cols = vc->vc_cols;
 839         old_row_size = vc->vc_size_row;
 840         old_screen_size = vc->vc_screenbuf_size;
 841
 842         err = resize_screen(vc, new_cols, new_rows, user);
 843         if (err) {
 844                 kfree(newscreen);
 845                 return err;
 846         }
 847
 848         vc->vc_rows = new_rows;
 849         vc->vc_cols = new_cols;
 850         vc->vc_size_row = new_row_size;
 851         vc->vc_screenbuf_size = new_screen_size;
 852
 853         rlth = min(old_row_size, new_row_size);
 854         rrem = new_row_size - rlth;
 855         old_origin = vc->vc_origin;
 856         new_origin = (long) newscreen;
 857         new_scr_end = new_origin + new_screen_size;
 858
 859         if (vc->vc_y > new_rows) {
 860                 if (old_rows - vc->vc_y < new_rows) {
 861                         /*
 862                          * Cursor near the bottom, copy contents from the
 863                          * bottom of buffer
 864                          */
 865                         old_origin += (old_rows - new_rows) * old_row_size;
 866                         end = vc->vc_scr_end;
 867                 } else {
 868                         /*
 869                          * Cursor is in no man's land, copy 1/2 screenful
 870                          * from the top and bottom of cursor position
 871                          */
 872                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 873                         end = old_origin + (old_row_size * new_rows);
 874                 }
 875         } else
 876                 /*
 877                  * Cursor near the top, copy contents from the top of buffer
 878                  */
 879                 end = (old_rows > new_rows) ? old_origin +
 880                         (old_row_size * new_rows) :
 881                         vc->vc_scr_end;
 882
 883         update_attr(vc);
 884
 885         while (old_origin < end) {
 886                 scr_memcpyw((unsigned short *) new_origin,
 887                             (unsigned short *) old_origin, rlth);
 888                 if (rrem)
 889                         scr_memsetw((void *)(new_origin + rlth),
 890                                     vc->vc_video_erase_char, rrem);
 891                 old_origin += old_row_size;
 892                 new_origin += new_row_size;
 893         }
 894         if (new_scr_end > new_origin)
 895                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 896                             new_scr_end - new_origin);
 897         if (vc->vc_kmalloced)
 898                 kfree(vc->vc_screenbuf);
 899         vc->vc_screenbuf = newscreen;
 900         vc->vc_kmalloced = 1;
 901         vc->vc_screenbuf_size = new_screen_size;
 902         set_origin(vc);
 903
 904         /* do part of a reset_terminal() */
 905         vc->vc_top = 0;
 906         vc->vc_bottom = vc->vc_rows;
 907         gotoxy(vc, vc->vc_x, vc->vc_y);
 908         save_cur(vc);
 909
 910         if (vc->vc_tty) {
 911                 struct winsize ws, *cws = &vc->vc_tty->winsize;
 912
 913                 memset(&ws, 0, sizeof(ws));
 914                 ws.ws_row = vc->vc_rows;
 915                 ws.ws_col = vc->vc_cols;
 916                 ws.ws_ypixel = vc->vc_scan_lines;
 917                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
 918                     vc->vc_tty->pgrp)
 919                         kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
 920                 *cws = ws;
 921         }
 922
 923         if (CON_IS_VISIBLE(vc))
 924                 update_screen(vc);
 925         return err;
 926 }
 927
 928 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 929 {
 930         int rc;
 931
 932         acquire_console_sem();
 933         rc = vc_resize(vc, cols, lines);
 934         release_console_sem();
 935         return rc;
 936 }
 937
 938 void vc_deallocate(unsigned int currcons)
 939 {
 940         WARN_CONSOLE_UNLOCKED();
 941
 942         if (vc_cons_allocated(currcons)) {
 943                 struct vc_data *vc = vc_cons[currcons].d;
 944                 struct vt_notifier_param param = { .vc = vc };
 945                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 946                 vc->vc_sw->con_deinit(vc);
 947                 put_pid(vc->vt_pid);
 948                 module_put(vc->vc_sw->owner);
 949                 if (vc->vc_kmalloced)
 950                         kfree(vc->vc_screenbuf);
 951                 if (currcons >= MIN_NR_CONSOLES)
 952                         kfree(vc);
 953                 vc_cons[currcons].d = NULL;
 954         }
 955 }
 956
 957 /*
 958  *      VT102 emulator
 959  */
 960
 961 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 962 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 963 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 964
 965 #define decarm          VC_REPEAT
 966 #define decckm          VC_CKMODE
 967 #define kbdapplic       VC_APPLIC
 968 #define lnm             VC_CRLF
 969
 970 /*
 971  * this is what the terminal answers to a ESC-Z or csi0c query.
 972  */
 973 #define VT100ID "\033[?1;2c"
 974 #define VT102ID "\033[?6c"
 975
 976 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
 977                                        8,12,10,14, 9,13,11,15 };
 978
 979 /* the default colour table, for VGA+ colour systems */
 980 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
 981     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
 982 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
 983     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
 984 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
 985     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
 986
 987 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
 988 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
 989 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
 990
 991 /*
 992  * gotoxy() must verify all boundaries, because the arguments
 993  * might also be negative. If the given position is out of
 994  * bounds, the cursor is placed at the nearest margin.
 995  */
 996 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
 997 {
 998         int min_y, max_y;
 999
1000         if (new_x < 0)
1001                 vc->vc_x = 0;
1002         else {
1003                 if (new_x >= vc->vc_cols)
1004                         vc->vc_x = vc->vc_cols - 1;
1005                 else
1006                         vc->vc_x = new_x;
1007         }
1008
1009         if (vc->vc_decom) {
1010                 min_y = vc->vc_top;
1011                 max_y = vc->vc_bottom;
1012         } else {
1013                 min_y = 0;
1014                 max_y = vc->vc_rows;
1015         }
1016         if (new_y < min_y)
1017                 vc->vc_y = min_y;
1018         else if (new_y >= max_y)
1019                 vc->vc_y = max_y - 1;
1020         else
1021                 vc->vc_y = new_y;
1022         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1023         vc->vc_need_wrap = 0;
1024 }
1025
1026 /* for absolute user moves, when decom is set */
1027 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1028 {
1029         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1030 }
1031
1032 void scrollback(struct vc_data *vc, int lines)
1033 {
1034         if (!lines)
1035                 lines = vc->vc_rows / 2;
1036         scrolldelta(-lines);
1037 }
1038
1039 void scrollfront(struct vc_data *vc, int lines)
1040 {
1041         if (!lines)
1042                 lines = vc->vc_rows / 2;
1043         scrolldelta(lines);
1044 }
1045
1046 static void lf(struct vc_data *vc)
1047 {
1048         /* don't scroll if above bottom of scrolling region, or
1049          * if below scrolling region
1050          */
1051         if (vc->vc_y + 1 == vc->vc_bottom)
1052                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1053         else if (vc->vc_y < vc->vc_rows - 1) {
1054                 vc->vc_y++;
1055                 vc->vc_pos += vc->vc_size_row;
1056         }
1057         vc->vc_need_wrap = 0;
1058         notify_write(vc, '\n');
1059 }
1060
1061 static void ri(struct vc_data *vc)
1062 {
1063         /* don't scroll if below top of scrolling region, or
1064          * if above scrolling region
1065          */
1066         if (vc->vc_y == vc->vc_top)
1067                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1068         else if (vc->vc_y > 0) {
1069                 vc->vc_y--;
1070                 vc->vc_pos -= vc->vc_size_row;
1071         }
1072         vc->vc_need_wrap = 0;
1073 }
1074
1075 static inline void cr(struct vc_data *vc)
1076 {
1077         vc->vc_pos -= vc->vc_x << 1;
1078         vc->vc_need_wrap = vc->vc_x = 0;
1079         notify_write(vc, '\r');
1080 }
1081
1082 static inline void bs(struct vc_data *vc)
1083 {
1084         if (vc->vc_x) {
1085                 vc->vc_pos -= 2;
1086                 vc->vc_x--;
1087                 vc->vc_need_wrap = 0;
1088                 notify_write(vc, '\b');
1089         }
1090 }
1091
1092 static inline void del(struct vc_data *vc)
1093 {
1094         /* ignored */
1095 }
1096
1097 static void csi_J(struct vc_data *vc, int vpar)
1098 {
1099         unsigned int count;
1100         unsigned short * start;
1101
1102         switch (vpar) {
1103                 case 0: /* erase from cursor to end of display */
1104                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1105                         start = (unsigned short *)vc->vc_pos;
1106                         if (DO_UPDATE(vc)) {
1107                                 /* do in two stages */
1108                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1109                                               vc->vc_cols - vc->vc_x);
1110                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1111                                               vc->vc_rows - vc->vc_y - 1,
1112                                               vc->vc_cols);
1113                         }
1114                         break;
1115                 case 1: /* erase from start to cursor */
1116                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1117                         start = (unsigned short *)vc->vc_origin;
1118                         if (DO_UPDATE(vc)) {
1119                                 /* do in two stages */
1120                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1121                                               vc->vc_cols);
1122                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1123                                               vc->vc_x + 1);
1124                         }
1125                         break;
1126                 case 2: /* erase whole display */
1127                         count = vc->vc_cols * vc->vc_rows;
1128                         start = (unsigned short *)vc->vc_origin;
1129                         if (DO_UPDATE(vc))
1130                                 vc->vc_sw->con_clear(vc, 0, 0,
1131                                               vc->vc_rows,
1132                                               vc->vc_cols);
1133                         break;
1134                 default:
1135                         return;
1136         }
1137         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1138         vc->vc_need_wrap = 0;
1139 }
1140
1141 static void csi_K(struct vc_data *vc, int vpar)
1142 {
1143         unsigned int count;
1144         unsigned short * start;
1145
1146         switch (vpar) {
1147                 case 0: /* erase from cursor to end of line */
1148                         count = vc->vc_cols - vc->vc_x;
1149                         start = (unsigned short *)vc->vc_pos;
1150                         if (DO_UPDATE(vc))
1151                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1152                                                      vc->vc_cols - vc->vc_x);
1153                         break;
1154                 case 1: /* erase from start of line to cursor */
1155                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1156                         count = vc->vc_x + 1;
1157                         if (DO_UPDATE(vc))
1158                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1159                                                      vc->vc_x + 1);
1160                         break;
1161                 case 2: /* erase whole line */
1162                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1163                         count = vc->vc_cols;
1164                         if (DO_UPDATE(vc))
1165                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1166                                               vc->vc_cols);
1167                         break;
1168                 default:
1169                         return;
1170         }
1171         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1172         vc->vc_need_wrap = 0;
1173 }
1174
1175 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1176 {                                         /* not vt100? */
1177         int count;
1178
1179         if (!vpar)
1180                 vpar++;
1181         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1182
1183         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1184         if (DO_UPDATE(vc))
1185                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1186         vc->vc_need_wrap = 0;
1187 }
1188
1189 static void default_attr(struct vc_data *vc)
1190 {
1191         vc->vc_intensity = 1;
1192         vc->vc_italic = 0;
1193         vc->vc_underline = 0;
1194         vc->vc_reverse = 0;
1195         vc->vc_blink = 0;
1196         vc->vc_color = vc->vc_def_color;
1197 }
1198
1199 /* console_sem is held */
1200 static void csi_m(struct vc_data *vc)
1201 {
1202         int i;
1203
1204         for (i = 0; i <= vc->vc_npar; i++)
1205                 switch (vc->vc_par[i]) {
1206                         case 0: /* all attributes off */
1207                                 default_attr(vc);
1208                                 break;
1209                         case 1:
1210                                 vc->vc_intensity = 2;
1211                                 break;
1212                         case 2:
1213                                 vc->vc_intensity = 0;
1214                                 break;
1215                         case 3:
1216                                 vc->vc_italic = 1;
1217                                 break;
1218                         case 4:
1219                                 vc->vc_underline = 1;
1220                                 break;
1221                         case 5:
1222                                 vc->vc_blink = 1;
1223                                 break;
1224                         case 7:
1225                                 vc->vc_reverse = 1;
1226                                 break;
1227                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1228                                   * Select primary font, don't display
1229                                   * control chars if defined, don't set
1230                                   * bit 8 on output.
1231                                   */
1232                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1233                                                 ? vc->vc_G0_charset
1234                                                 : vc->vc_G1_charset, vc);
1235                                 vc->vc_disp_ctrl = 0;
1236                                 vc->vc_toggle_meta = 0;
1237                                 break;
1238                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1239                                   * Select first alternate font, lets
1240                                   * chars < 32 be displayed as ROM chars.
1241                                   */
1242                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1243                                 vc->vc_disp_ctrl = 1;
1244                                 vc->vc_toggle_meta = 0;
1245                                 break;
1246                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1247                                   * Select second alternate font, toggle
1248                                   * high bit before displaying as ROM char.
1249                                   */
1250                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1251                                 vc->vc_disp_ctrl = 1;
1252                                 vc->vc_toggle_meta = 1;
1253                                 break;
1254                         case 21:
1255                         case 22:
1256                                 vc->vc_intensity = 1;
1257                                 break;
1258                         case 23:
1259                                 vc->vc_italic = 0;
1260                                 break;
1261                         case 24:
1262                                 vc->vc_underline = 0;
1263                                 break;
1264                         case 25:
1265                                 vc->vc_blink = 0;
1266                                 break;
1267                         case 27:
1268                                 vc->vc_reverse = 0;
1269                                 break;
1270                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1271                                   * Enables underscore, white foreground
1272                                   * with white underscore (Linux - use
1273                                   * default foreground).
1274                                   */
1275                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1276                                 vc->vc_underline = 1;
1277                                 break;
1278                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1279                                   * Disable underline option.
1280                                   * Reset colour to default? It did this
1281                                   * before...
1282                                   */
1283                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1284                                 vc->vc_underline = 0;
1285                                 break;
1286                         case 49:
1287                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1288                                 break;
1289                         default:
1290                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1291                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1292                                                 | (vc->vc_color & 0xf0);
1293                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1294                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1295                                                 | (vc->vc_color & 0x0f);
1296                                 break;
1297                 }
1298         update_attr(vc);
1299 }
1300
1301 static void respond_string(const char *p, struct tty_struct *tty)
1302 {
1303         while (*p) {
1304                 tty_insert_flip_char(tty, *p, 0);
1305                 p++;
1306         }
1307         con_schedule_flip(tty);
1308 }
1309
1310 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1311 {
1312         char buf[40];
1313
1314         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1315         respond_string(buf, tty);
1316 }
1317
1318 static inline void status_report(struct tty_struct *tty)
1319 {
1320         respond_string("\033[0n", tty); /* Terminal ok */
1321 }
1322
1323 static inline void respond_ID(struct tty_struct * tty)
1324 {
1325         respond_string(VT102ID, tty);
1326 }
1327
1328 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1329 {
1330         char buf[8];
1331
1332         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1333                 (char)('!' + mry));
1334         respond_string(buf, tty);
1335 }
1336
1337 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1338 int mouse_reporting(void)
1339 {
1340         return vc_cons[fg_console].d->vc_report_mouse;
1341 }
1342
1343 /* console_sem is held */
1344 static void set_mode(struct vc_data *vc, int on_off)
1345 {
1346         int i;
1347
1348         for (i = 0; i <= vc->vc_npar; i++)
1349                 if (vc->vc_ques) {
1350                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1351                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1352                                 if (on_off)
1353                                         set_kbd(vc, decckm);
1354                                 else
1355                                         clr_kbd(vc, decckm);
1356                                 break;
1357                         case 3: /* 80/132 mode switch unimplemented */
1358                                 vc->vc_deccolm = on_off;
1359 #if 0
1360                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1361                                 /* this alone does not suffice; some user mode
1362                                    utility has to change the hardware regs */
1363 #endif
1364                                 break;
1365                         case 5:                 /* Inverted screen on/off */
1366                                 if (vc->vc_decscnm != on_off) {
1367                                         vc->vc_decscnm = on_off;
1368                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1369                                         update_attr(vc);
1370                                 }
1371                                 break;
1372                         case 6:                 /* Origin relative/absolute */
1373                                 vc->vc_decom = on_off;
1374                                 gotoxay(vc, 0, 0);
1375                                 break;
1376                         case 7:                 /* Autowrap on/off */
1377                                 vc->vc_decawm = on_off;
1378                                 break;
1379                         case 8:                 /* Autorepeat on/off */
1380                                 if (on_off)
1381                                         set_kbd(vc, decarm);
1382                                 else
1383                                         clr_kbd(vc, decarm);
1384                                 break;
1385                         case 9:
1386                                 vc->vc_report_mouse = on_off ? 1 : 0;
1387                                 break;
1388                         case 25:                /* Cursor on/off */
1389                                 vc->vc_deccm = on_off;
1390                                 break;
1391                         case 1000:
1392                                 vc->vc_report_mouse = on_off ? 2 : 0;
1393                                 break;
1394                         }
1395                 } else {
1396                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1397                         case 3:                 /* Monitor (display ctrls) */
1398                                 vc->vc_disp_ctrl = on_off;
1399                                 break;
1400                         case 4:                 /* Insert Mode on/off */
1401                                 vc->vc_decim = on_off;
1402                                 break;
1403                         case 20:                /* Lf, Enter == CrLf/Lf */
1404                                 if (on_off)
1405                                         set_kbd(vc, lnm);
1406                                 else
1407                                         clr_kbd(vc, lnm);
1408                                 break;
1409                         }
1410                 }
1411 }
1412
1413 /* console_sem is held */
1414 static void setterm_command(struct vc_data *vc)
1415 {
1416         switch(vc->vc_par[0]) {
1417                 case 1: /* set color for underline mode */
1418                         if (vc->vc_can_do_color &&
1419                                         vc->vc_par[1] < 16) {
1420                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1421                                 if (vc->vc_underline)
1422                                         update_attr(vc);
1423                         }
1424                         break;
1425                 case 2: /* set color for half intensity mode */
1426                         if (vc->vc_can_do_color &&
1427                                         vc->vc_par[1] < 16) {
1428                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1429                                 if (vc->vc_intensity == 0)
1430                                         update_attr(vc);
1431                         }
1432                         break;
1433                 case 8: /* store colors as defaults */
1434                         vc->vc_def_color = vc->vc_attr;
1435                         if (vc->vc_hi_font_mask == 0x100)
1436                                 vc->vc_def_color >>= 1;
1437                         default_attr(vc);
1438                         update_attr(vc);
1439                         break;
1440                 case 9: /* set blanking interval */
1441                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1442                         poke_blanked_console();
1443                         break;
1444                 case 10: /* set bell frequency in Hz */
1445                         if (vc->vc_npar >= 1)
1446                                 vc->vc_bell_pitch = vc->vc_par[1];
1447                         else
1448                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1449                         break;
1450                 case 11: /* set bell duration in msec */
1451                         if (vc->vc_npar >= 1)
1452                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1453                                         vc->vc_par[1] * HZ / 1000 : 0;
1454                         else
1455                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1456                         break;
1457                 case 12: /* bring specified console to the front */
1458                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1459                                 set_console(vc->vc_par[1] - 1);
1460                         break;
1461                 case 13: /* unblank the screen */
1462                         poke_blanked_console();
1463                         break;
1464                 case 14: /* set vesa powerdown interval */
1465                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1466                         break;
1467                 case 15: /* activate the previous console */
1468                         set_console(last_console);
1469                         break;
1470         }
1471 }
1472
1473 /* console_sem is held */
1474 static void csi_at(struct vc_data *vc, unsigned int nr)
1475 {
1476         if (nr > vc->vc_cols - vc->vc_x)
1477                 nr = vc->vc_cols - vc->vc_x;
1478         else if (!nr)
1479                 nr = 1;
1480         insert_char(vc, nr);
1481 }
1482
1483 /* console_sem is held */
1484 static void csi_L(struct vc_data *vc, unsigned int nr)
1485 {
1486         if (nr > vc->vc_rows - vc->vc_y)
1487                 nr = vc->vc_rows - vc->vc_y;
1488         else if (!nr)
1489                 nr = 1;
1490         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1491         vc->vc_need_wrap = 0;
1492 }
1493
1494 /* console_sem is held */
1495 static void csi_P(struct vc_data *vc, unsigned int nr)
1496 {
1497         if (nr > vc->vc_cols - vc->vc_x)
1498                 nr = vc->vc_cols - vc->vc_x;
1499         else if (!nr)
1500                 nr = 1;
1501         delete_char(vc, nr);
1502 }
1503
1504 /* console_sem is held */
1505 static void csi_M(struct vc_data *vc, unsigned int nr)
1506 {
1507         if (nr > vc->vc_rows - vc->vc_y)
1508                 nr = vc->vc_rows - vc->vc_y;
1509         else if (!nr)
1510                 nr=1;
1511         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1512         vc->vc_need_wrap = 0;
1513 }
1514
1515 /* console_sem is held (except via vc_init->reset_terminal */
1516 static void save_cur(struct vc_data *vc)
1517 {
1518         vc->vc_saved_x          = vc->vc_x;
1519         vc->vc_saved_y          = vc->vc_y;
1520         vc->vc_s_intensity      = vc->vc_intensity;
1521         vc->vc_s_italic         = vc->vc_italic;
1522         vc->vc_s_underline      = vc->vc_underline;
1523         vc->vc_s_blink          = vc->vc_blink;
1524         vc->vc_s_reverse        = vc->vc_reverse;
1525         vc->vc_s_charset        = vc->vc_charset;
1526         vc->vc_s_color          = vc->vc_color;
1527         vc->vc_saved_G0         = vc->vc_G0_charset;
1528         vc->vc_saved_G1         = vc->vc_G1_charset;
1529 }
1530
1531 /* console_sem is held */
1532 static void restore_cur(struct vc_data *vc)
1533 {
1534         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1535         vc->vc_intensity        = vc->vc_s_intensity;
1536         vc->vc_italic           = vc->vc_s_italic;
1537         vc->vc_underline        = vc->vc_s_underline;
1538         vc->vc_blink            = vc->vc_s_blink;
1539         vc->vc_reverse          = vc->vc_s_reverse;
1540         vc->vc_charset          = vc->vc_s_charset;
1541         vc->vc_color            = vc->vc_s_color;
1542         vc->vc_G0_charset       = vc->vc_saved_G0;
1543         vc->vc_G1_charset       = vc->vc_saved_G1;
1544         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1545         update_attr(vc);
1546         vc->vc_need_wrap = 0;
1547 }
1548
1549 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1550         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1551         ESpalette };
1552
1553 /* console_sem is held (except via vc_init()) */
1554 static void reset_terminal(struct vc_data *vc, int do_clear)
1555 {
1556         vc->vc_top              = 0;
1557         vc->vc_bottom           = vc->vc_rows;
1558         vc->vc_state            = ESnormal;
1559         vc->vc_ques             = 0;
1560         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1561         vc->vc_G0_charset       = LAT1_MAP;
1562         vc->vc_G1_charset       = GRAF_MAP;
1563         vc->vc_charset          = 0;
1564         vc->vc_need_wrap        = 0;
1565         vc->vc_report_mouse     = 0;
1566         vc->vc_utf              = default_utf8;
1567         vc->vc_utf_count        = 0;
1568
1569         vc->vc_disp_ctrl        = 0;
1570         vc->vc_toggle_meta      = 0;
1571
1572         vc->vc_decscnm          = 0;
1573         vc->vc_decom            = 0;
1574         vc->vc_decawm           = 1;
1575         vc->vc_deccm            = 1;
1576         vc->vc_decim            = 0;
1577
1578         set_kbd(vc, decarm);
1579         clr_kbd(vc, decckm);
1580         clr_kbd(vc, kbdapplic);
1581         clr_kbd(vc, lnm);
1582         kbd_table[vc->vc_num].lockstate = 0;
1583         kbd_table[vc->vc_num].slockstate = 0;
1584         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1585         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1586         /* do not do set_leds here because this causes an endless tasklet loop
1587            when the keyboard hasn't been initialized yet */
1588
1589         vc->vc_cursor_type = CUR_DEFAULT;
1590         vc->vc_complement_mask = vc->vc_s_complement_mask;
1591
1592         default_attr(vc);
1593         update_attr(vc);
1594
1595         vc->vc_tab_stop[0]      = 0x01010100;
1596         vc->vc_tab_stop[1]      =
1597         vc->vc_tab_stop[2]      =
1598         vc->vc_tab_stop[3]      =
1599         vc->vc_tab_stop[4]      = 0x01010101;
1600
1601         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1602         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1603
1604         gotoxy(vc, 0, 0);
1605         save_cur(vc);
1606         if (do_clear)
1607             csi_J(vc, 2);
1608 }
1609
1610 /* console_sem is held */
1611 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1612 {
1613         /*
1614          *  Control characters can be used in the _middle_
1615          *  of an escape sequence.
1616          */
1617         switch (c) {
1618         case 0:
1619                 return;
1620         case 7:
1621                 if (vc->vc_bell_duration)
1622                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1623                 return;
1624         case 8:
1625                 bs(vc);
1626                 return;
1627         case 9:
1628                 vc->vc_pos -= (vc->vc_x << 1);
1629                 while (vc->vc_x < vc->vc_cols - 1) {
1630                         vc->vc_x++;
1631                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1632                                 break;
1633                 }
1634                 vc->vc_pos += (vc->vc_x << 1);
1635                 notify_write(vc, '\t');
1636                 return;
1637         case 10: case 11: case 12:
1638                 lf(vc);
1639                 if (!is_kbd(vc, lnm))
1640                         return;
1641         case 13:
1642                 cr(vc);
1643                 return;
1644         case 14:
1645                 vc->vc_charset = 1;
1646                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1647                 vc->vc_disp_ctrl = 1;
1648                 return;
1649         case 15:
1650                 vc->vc_charset = 0;
1651                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1652                 vc->vc_disp_ctrl = 0;
1653                 return;
1654         case 24: case 26:
1655                 vc->vc_state = ESnormal;
1656                 return;
1657         case 27:
1658                 vc->vc_state = ESesc;
1659                 return;
1660         case 127:
1661                 del(vc);
1662                 return;
1663         case 128+27:
1664                 vc->vc_state = ESsquare;
1665                 return;
1666         }
1667         switch(vc->vc_state) {
1668         case ESesc:
1669                 vc->vc_state = ESnormal;
1670                 switch (c) {
1671                 case '[':
1672                         vc->vc_state = ESsquare;
1673                         return;
1674                 case ']':
1675                         vc->vc_state = ESnonstd;
1676                         return;
1677                 case '%':
1678                         vc->vc_state = ESpercent;
1679                         return;
1680                 case 'E':
1681                         cr(vc);
1682                         lf(vc);
1683                         return;
1684                 case 'M':
1685                         ri(vc);
1686                         return;
1687                 case 'D':
1688                         lf(vc);
1689                         return;
1690                 case 'H':
1691                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1692                         return;
1693                 case 'Z':
1694                         respond_ID(tty);
1695                         return;
1696                 case '7':
1697                         save_cur(vc);
1698                         return;
1699                 case '8':
1700                         restore_cur(vc);
1701                         return;
1702                 case '(':
1703                         vc->vc_state = ESsetG0;
1704                         return;
1705                 case ')':
1706                         vc->vc_state = ESsetG1;
1707                         return;
1708                 case '#':
1709                         vc->vc_state = EShash;
1710                         return;
1711                 case 'c':
1712                         reset_terminal(vc, 1);
1713                         return;
1714                 case '>':  /* Numeric keypad */
1715                         clr_kbd(vc, kbdapplic);
1716                         return;
1717                 case '=':  /* Appl. keypad */
1718                         set_kbd(vc, kbdapplic);
1719                         return;
1720                 }
1721                 return;
1722         case ESnonstd:
1723                 if (c=='P') {   /* palette escape sequence */
1724                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1725                                 vc->vc_par[vc->vc_npar] = 0;
1726                         vc->vc_npar = 0;
1727                         vc->vc_state = ESpalette;
1728                         return;
1729                 } else if (c=='R') {   /* reset palette */
1730                         reset_palette(vc);
1731                         vc->vc_state = ESnormal;
1732                 } else
1733                         vc->vc_state = ESnormal;
1734                 return;
1735         case ESpalette:
1736                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1737                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1738                         if (vc->vc_npar == 7) {
1739                                 int i = vc->vc_par[0] * 3, j = 1;
1740                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1741                                 vc->vc_palette[i++] += vc->vc_par[j++];
1742                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1743                                 vc->vc_palette[i++] += vc->vc_par[j++];
1744                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1745                                 vc->vc_palette[i] += vc->vc_par[j];
1746                                 set_palette(vc);
1747                                 vc->vc_state = ESnormal;
1748                         }
1749                 } else
1750                         vc->vc_state = ESnormal;
1751                 return;
1752         case ESsquare:
1753                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1754                         vc->vc_par[vc->vc_npar] = 0;
1755                 vc->vc_npar = 0;
1756                 vc->vc_state = ESgetpars;
1757                 if (c == '[') { /* Function key */
1758                         vc->vc_state=ESfunckey;
1759                         return;
1760                 }
1761                 vc->vc_ques = (c == '?');
1762                 if (vc->vc_ques)
1763                         return;
1764         case ESgetpars:
1765                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1766                         vc->vc_npar++;
1767                         return;
1768                 } else if (c>='0' && c<='9') {
1769                         vc->vc_par[vc->vc_npar] *= 10;
1770                         vc->vc_par[vc->vc_npar] += c - '0';
1771                         return;
1772                 } else
1773                         vc->vc_state = ESgotpars;
1774         case ESgotpars:
1775                 vc->vc_state = ESnormal;
1776                 switch(c) {
1777                 case 'h':
1778                         set_mode(vc, 1);
1779                         return;
1780                 case 'l':
1781                         set_mode(vc, 0);
1782                         return;
1783                 case 'c':
1784                         if (vc->vc_ques) {
1785                                 if (vc->vc_par[0])
1786                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1787                                 else
1788                                         vc->vc_cursor_type = CUR_DEFAULT;
1789                                 return;
1790                         }
1791                         break;
1792                 case 'm':
1793                         if (vc->vc_ques) {
1794                                 clear_selection();
1795                                 if (vc->vc_par[0])
1796                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1797                                 else
1798                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1799                                 return;
1800                         }
1801                         break;
1802                 case 'n':
1803                         if (!vc->vc_ques) {
1804                                 if (vc->vc_par[0] == 5)
1805                                         status_report(tty);
1806                                 else if (vc->vc_par[0] == 6)
1807                                         cursor_report(vc, tty);
1808                         }
1809                         return;
1810                 }
1811                 if (vc->vc_ques) {
1812                         vc->vc_ques = 0;
1813                         return;
1814                 }
1815                 switch(c) {
1816                 case 'G': case '`':
1817                         if (vc->vc_par[0])
1818                                 vc->vc_par[0]--;
1819                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1820                         return;
1821                 case 'A':
1822                         if (!vc->vc_par[0])
1823                                 vc->vc_par[0]++;
1824                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1825                         return;
1826                 case 'B': case 'e':
1827                         if (!vc->vc_par[0])
1828                                 vc->vc_par[0]++;
1829                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1830                         return;
1831                 case 'C': case 'a':
1832                         if (!vc->vc_par[0])
1833                                 vc->vc_par[0]++;
1834                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1835                         return;
1836                 case 'D':
1837                         if (!vc->vc_par[0])
1838                                 vc->vc_par[0]++;
1839                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1840                         return;
1841                 case 'E':
1842                         if (!vc->vc_par[0])
1843                                 vc->vc_par[0]++;
1844                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1845                         return;
1846                 case 'F':
1847                         if (!vc->vc_par[0])
1848                                 vc->vc_par[0]++;
1849                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1850                         return;
1851                 case 'd':
1852                         if (vc->vc_par[0])
1853                                 vc->vc_par[0]--;
1854                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1855                         return;
1856                 case 'H': case 'f':
1857                         if (vc->vc_par[0])
1858                                 vc->vc_par[0]--;
1859                         if (vc->vc_par[1])
1860                                 vc->vc_par[1]--;
1861                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1862                         return;
1863                 case 'J':
1864                         csi_J(vc, vc->vc_par[0]);
1865                         return;
1866                 case 'K':
1867                         csi_K(vc, vc->vc_par[0]);
1868                         return;
1869                 case 'L':
1870                         csi_L(vc, vc->vc_par[0]);
1871                         return;
1872                 case 'M':
1873                         csi_M(vc, vc->vc_par[0]);
1874                         return;
1875                 case 'P':
1876                         csi_P(vc, vc->vc_par[0]);
1877                         return;
1878                 case 'c':
1879                         if (!vc->vc_par[0])
1880                                 respond_ID(tty);
1881                         return;
1882                 case 'g':
1883                         if (!vc->vc_par[0])
1884                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1885                         else if (vc->vc_par[0] == 3) {
1886                                 vc->vc_tab_stop[0] =
1887                                         vc->vc_tab_stop[1] =
1888                                         vc->vc_tab_stop[2] =
1889                                         vc->vc_tab_stop[3] =
1890                                         vc->vc_tab_stop[4] = 0;
1891                         }
1892                         return;
1893                 case 'm':
1894                         csi_m(vc);
1895                         return;
1896                 case 'q': /* DECLL - but only 3 leds */
1897                         /* map 0,1,2,3 to 0,1,2,4 */
1898                         if (vc->vc_par[0] < 4)
1899                                 setledstate(kbd_table + vc->vc_num,
1900                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1901                         return;
1902                 case 'r':
1903                         if (!vc->vc_par[0])
1904                                 vc->vc_par[0]++;
1905                         if (!vc->vc_par[1])
1906                                 vc->vc_par[1] = vc->vc_rows;
1907                         /* Minimum allowed region is 2 lines */
1908                         if (vc->vc_par[0] < vc->vc_par[1] &&
1909                             vc->vc_par[1] <= vc->vc_rows) {
1910                                 vc->vc_top = vc->vc_par[0] - 1;
1911                                 vc->vc_bottom = vc->vc_par[1];
1912                                 gotoxay(vc, 0, 0);
1913                         }
1914                         return;
1915                 case 's':
1916                         save_cur(vc);
1917                         return;
1918                 case 'u':
1919                         restore_cur(vc);
1920                         return;
1921                 case 'X':
1922                         csi_X(vc, vc->vc_par[0]);
1923                         return;
1924                 case '@':
1925                         csi_at(vc, vc->vc_par[0]);
1926                         return;
1927                 case ']': /* setterm functions */
1928                         setterm_command(vc);
1929                         return;
1930                 }
1931                 return;
1932         case ESpercent:
1933                 vc->vc_state = ESnormal;
1934                 switch (c) {
1935                 case '@':  /* defined in ISO 2022 */
1936                         vc->vc_utf = 0;
1937                         return;
1938                 case 'G':  /* prelim official escape code */
1939                 case '8':  /* retained for compatibility */
1940                         vc->vc_utf = 1;
1941                         return;
1942                 }
1943                 return;
1944         case ESfunckey:
1945                 vc->vc_state = ESnormal;
1946                 return;
1947         case EShash:
1948                 vc->vc_state = ESnormal;
1949                 if (c == '8') {
1950                         /* DEC screen alignment test. kludge :-) */
1951                         vc->vc_video_erase_char =
1952                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1953                         csi_J(vc, 2);
1954                         vc->vc_video_erase_char =
1955                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1956                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1957                 }
1958                 return;
1959         case ESsetG0:
1960                 if (c == '0')
1961                         vc->vc_G0_charset = GRAF_MAP;
1962                 else if (c == 'B')
1963                         vc->vc_G0_charset = LAT1_MAP;
1964                 else if (c == 'U')
1965                         vc->vc_G0_charset = IBMPC_MAP;
1966                 else if (c == 'K')
1967                         vc->vc_G0_charset = USER_MAP;
1968                 if (vc->vc_charset == 0)
1969                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1970                 vc->vc_state = ESnormal;
1971                 return;
1972         case ESsetG1:
1973                 if (c == '0')
1974                         vc->vc_G1_charset = GRAF_MAP;
1975                 else if (c == 'B')
1976                         vc->vc_G1_charset = LAT1_MAP;
1977                 else if (c == 'U')
1978                         vc->vc_G1_charset = IBMPC_MAP;
1979                 else if (c == 'K')
1980                         vc->vc_G1_charset = USER_MAP;
1981                 if (vc->vc_charset == 1)
1982                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1983                 vc->vc_state = ESnormal;
1984                 return;
1985         default:
1986                 vc->vc_state = ESnormal;
1987         }
1988 }
1989
1990 /* This is a temporary buffer used to prepare a tty console write
1991  * so that we can easily avoid touching user space while holding the
1992  * console spinlock.  It is allocated in con_init and is shared by
1993  * this code and the vc_screen read/write tty calls.
1994  *
1995  * We have to allocate this statically in the kernel data section
1996  * since console_init (and thus con_init) are called before any
1997  * kernel memory allocation is available.
1998  */
1999 char con_buf[CON_BUF_SIZE];
2000 DEFINE_MUTEX(con_buf_mtx);
2001
2002 /* is_double_width() is based on the wcwidth() implementation by
2003  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2004  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2005  */
2006 struct interval {
2007         uint32_t first;
2008         uint32_t last;
2009 };
2010
2011 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2012 {
2013         int min = 0;
2014         int mid;
2015
2016         if (ucs < table[0].first || ucs > table[max].last)
2017                 return 0;
2018         while (max >= min) {
2019                 mid = (min + max) / 2;
2020                 if (ucs > table[mid].last)
2021                         min = mid + 1;
2022                 else if (ucs < table[mid].first)
2023                         max = mid - 1;
2024                 else
2025                         return 1;
2026         }
2027         return 0;
2028 }
2029
2030 static int is_double_width(uint32_t ucs)
2031 {
2032         static const struct interval double_width[] = {
2033                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2034                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2035                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2036                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2037         };
2038         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2039 }
2040
2041 /* acquires console_sem */
2042 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2043 {
2044 #ifdef VT_BUF_VRAM_ONLY
2045 #define FLUSH do { } while(0);
2046 #else
2047 #define FLUSH if (draw_x >= 0) { \
2048         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2049         draw_x = -1; \
2050         }
2051 #endif
2052
2053         int c, tc, ok, n = 0, draw_x = -1;
2054         unsigned int currcons;
2055         unsigned long draw_from = 0, draw_to = 0;
2056         struct vc_data *vc;
2057         unsigned char vc_attr;
2058         struct vt_notifier_param param;
2059         uint8_t rescan;
2060         uint8_t inverse;
2061         uint8_t width;
2062         u16 himask, charmask;
2063         const unsigned char *orig_buf = NULL;
2064         int orig_count;
2065
2066         if (in_interrupt())
2067                 return count;
2068
2069         might_sleep();
2070
2071         acquire_console_sem();
2072         vc = tty->driver_data;
2073         if (vc == NULL) {
2074                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2075                 release_console_sem();
2076                 return 0;
2077         }
2078
2079         currcons = vc->vc_num;
2080         if (!vc_cons_allocated(currcons)) {
2081             /* could this happen? */
2082             static int error = 0;
2083             if (!error) {
2084                 error = 1;
2085                 printk("con_write: tty %d not allocated\n", currcons+1);
2086             }
2087             release_console_sem();
2088             return 0;
2089         }
2090         release_console_sem();
2091
2092         orig_buf = buf;
2093         orig_count = count;
2094
2095         /* At this point 'buf' is guaranteed to be a kernel buffer
2096          * and therefore no access to userspace (and therefore sleeping)
2097          * will be needed.  The con_buf_mtx serializes all tty based
2098          * console rendering and vcs write/read operations.  We hold
2099          * the console spinlock during the entire write.
2100          */
2101
2102         acquire_console_sem();
2103
2104         vc = tty->driver_data;
2105         if (vc == NULL) {
2106                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2107                 release_console_sem();
2108                 goto out;
2109         }
2110
2111         himask = vc->vc_hi_font_mask;
2112         charmask = himask ? 0x1ff : 0xff;
2113
2114         /* undraw cursor first */
2115         if (IS_FG(vc))
2116                 hide_cursor(vc);
2117
2118         param.vc = vc;
2119
2120         while (!tty->stopped && count) {
2121                 int orig = *buf;
2122                 c = orig;
2123                 buf++;
2124                 n++;
2125                 count--;
2126                 rescan = 0;
2127                 inverse = 0;
2128                 width = 1;
2129
2130                 /* Do no translation at all in control states */
2131                 if (vc->vc_state != ESnormal) {
2132                         tc = c;
2133                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2134                     /* Combine UTF-8 into Unicode in vc_utf_char.
2135                      * vc_utf_count is the number of continuation bytes still
2136                      * expected to arrive.
2137                      * vc_npar is the number of continuation bytes arrived so
2138                      * far
2139                      */
2140 rescan_last_byte:
2141                     if ((c & 0xc0) == 0x80) {
2142                         /* Continuation byte received */
2143                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2144                         if (vc->vc_utf_count) {
2145                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2146                             vc->vc_npar++;
2147                             if (--vc->vc_utf_count) {
2148                                 /* Still need some bytes */
2149                                 continue;
2150                             }
2151                             /* Got a whole character */
2152                             c = vc->vc_utf_char;
2153                             /* Reject overlong sequences */
2154                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2155                                         c > utf8_length_changes[vc->vc_npar])
2156                                 c = 0xfffd;
2157                         } else {
2158                             /* Unexpected continuation byte */
2159                             vc->vc_utf_count = 0;
2160                             c = 0xfffd;
2161                         }
2162                     } else {
2163                         /* Single ASCII byte or first byte of a sequence received */
2164                         if (vc->vc_utf_count) {
2165                             /* Continuation byte expected */
2166                             rescan = 1;
2167                             vc->vc_utf_count = 0;
2168                             c = 0xfffd;
2169                         } else if (c > 0x7f) {
2170                             /* First byte of a multibyte sequence received */
2171                             vc->vc_npar = 0;
2172                             if ((c & 0xe0) == 0xc0) {
2173                                 vc->vc_utf_count = 1;
2174                                 vc->vc_utf_char = (c & 0x1f);
2175                             } else if ((c & 0xf0) == 0xe0) {
2176                                 vc->vc_utf_count = 2;
2177                                 vc->vc_utf_char = (c & 0x0f);
2178                             } else if ((c & 0xf8) == 0xf0) {
2179                                 vc->vc_utf_count = 3;
2180                                 vc->vc_utf_char = (c & 0x07);
2181                             } else if ((c & 0xfc) == 0xf8) {
2182                                 vc->vc_utf_count = 4;
2183                                 vc->vc_utf_char = (c & 0x03);
2184                             } else if ((c & 0xfe) == 0xfc) {
2185                                 vc->vc_utf_count = 5;
2186                                 vc->vc_utf_char = (c & 0x01);
2187                             } else {
2188                                 /* 254 and 255 are invalid */
2189                                 c = 0xfffd;
2190                             }
2191                             if (vc->vc_utf_count) {
2192                                 /* Still need some bytes */
2193                                 continue;
2194                             }
2195                         }
2196                         /* Nothing to do if an ASCII byte was received */
2197                     }
2198                     /* End of UTF-8 decoding. */
2199                     /* c is the received character, or U+FFFD for invalid sequences. */
2200                     /* Replace invalid Unicode code points with U+FFFD too */
2201                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2202                         c = 0xfffd;
2203                     tc = c;
2204                 } else {        /* no utf or alternate charset mode */
2205                     tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2206                 }
2207
2208                 param.c = tc;
2209                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2210                                         &param) == NOTIFY_STOP)
2211                         continue;
2212
2213                 /* If the original code was a control character we
2214                  * only allow a glyph to be displayed if the code is
2215                  * not normally used (such as for cursor movement) or
2216                  * if the disp_ctrl mode has been explicitly enabled.
2217                  * Certain characters (as given by the CTRL_ALWAYS
2218                  * bitmap) are always displayed as control characters,
2219                  * as the console would be pretty useless without
2220                  * them; to display an arbitrary font position use the
2221                  * direct-to-font zone in UTF-8 mode.
2222                  */
2223                 ok = tc && (c >= 32 ||
2224                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2225                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2226                         && (c != 127 || vc->vc_disp_ctrl)
2227                         && (c != 128+27);
2228
2229                 if (vc->vc_state == ESnormal && ok) {
2230                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2231                                 if (is_double_width(c))
2232                                         width = 2;
2233                         }
2234                         /* Now try to find out how to display it */
2235                         tc = conv_uni_to_pc(vc, tc);
2236                         if (tc & ~charmask) {
2237                                 if (tc == -1 || tc == -2) {
2238                                     continue; /* nothing to display */
2239                                 }
2240                                 /* Glyph not found */
2241                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2242                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2243                                        This would make absolutely no sense with Unicode in mind,
2244                                        but do this for ASCII characters since a font may lack
2245                                        Unicode mapping info and we don't want to end up with
2246                                        having question marks only. */
2247                                     tc = c;
2248                                 } else {
2249                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2250                                     tc = conv_uni_to_pc(vc, 0xfffd);
2251                                     if (tc < 0) {
2252                                         inverse = 1;
2253                                         tc = conv_uni_to_pc(vc, '?');
2254                                         if (tc < 0) tc = '?';
2255                                     }
2256                                 }
2257                         }
2258
2259                         if (!inverse) {
2260                                 vc_attr = vc->vc_attr;
2261                         } else {
2262                                 /* invert vc_attr */
2263                                 if (!vc->vc_can_do_color) {
2264                                         vc_attr = (vc->vc_attr) ^ 0x08;
2265                                 } else if (vc->vc_hi_font_mask == 0x100) {
2266                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2267                                 } else {
2268                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2269                                 }
2270                                 FLUSH
2271                         }
2272
2273                         while (1) {
2274                                 if (vc->vc_need_wrap || vc->vc_decim)
2275                                         FLUSH
2276                                 if (vc->vc_need_wrap) {
2277                                         cr(vc);
2278                                         lf(vc);
2279                                 }
2280                                 if (vc->vc_decim)
2281                                         insert_char(vc, 1);
2282                                 scr_writew(himask ?
2283                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2284                                              (vc_attr << 8) + tc,
2285                                            (u16 *) vc->vc_pos);
2286                                 if (DO_UPDATE(vc) && draw_x < 0) {
2287                                         draw_x = vc->vc_x;
2288                                         draw_from = vc->vc_pos;
2289                                 }
2290                                 if (vc->vc_x == vc->vc_cols - 1) {
2291                                         vc->vc_need_wrap = vc->vc_decawm;
2292                                         draw_to = vc->vc_pos + 2;
2293                                 } else {
2294                                         vc->vc_x++;
2295                                         draw_to = (vc->vc_pos += 2);
2296                                 }
2297
2298                                 if (!--width) break;
2299
2300                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2301                                 if (tc < 0) tc = ' ';
2302                         }
2303                         notify_write(vc, c);
2304
2305                         if (inverse) {
2306                                 FLUSH
2307                         }
2308
2309                         if (rescan) {
2310                                 rescan = 0;
2311                                 inverse = 0;
2312                                 width = 1;
2313                                 c = orig;
2314                                 goto rescan_last_byte;
2315                         }
2316                         continue;
2317                 }
2318                 FLUSH
2319                 do_con_trol(tty, vc, orig);
2320         }
2321         FLUSH
2322         console_conditional_schedule();
2323         release_console_sem();
2324
2325 out:
2326         notify_update(vc);
2327         return n;
2328 #undef FLUSH
2329 }
2330
2331 /*
2332  * This is the console switching callback.
2333  *
2334  * Doing console switching in a process context allows
2335  * us to do the switches asynchronously (needed when we want
2336  * to switch due to a keyboard interrupt).  Synchronization
2337  * with other console code and prevention of re-entrancy is
2338  * ensured with console_sem.
2339  */
2340 static void console_callback(struct work_struct *ignored)
2341 {
2342         acquire_console_sem();
2343
2344         if (want_console >= 0) {
2345                 if (want_console != fg_console &&
2346                     vc_cons_allocated(want_console)) {
2347                         hide_cursor(vc_cons[fg_console].d);
2348                         change_console(vc_cons[want_console].d);
2349                         /* we only changed when the console had already
2350                            been allocated - a new console is not created
2351                            in an interrupt routine */
2352                 }
2353                 want_console = -1;
2354         }
2355         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2356                 do_poke_blanked_console = 0;
2357                 poke_blanked_console();
2358         }
2359         if (scrollback_delta) {
2360                 struct vc_data *vc = vc_cons[fg_console].d;
2361                 clear_selection();
2362                 if (vc->vc_mode == KD_TEXT)
2363                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2364                 scrollback_delta = 0;
2365         }
2366         if (blank_timer_expired) {
2367                 do_blank_screen(0);
2368                 blank_timer_expired = 0;
2369         }
2370         notify_update(vc_cons[fg_console].d);
2371
2372         release_console_sem();
2373 }
2374
2375 int set_console(int nr)
2376 {
2377         struct vc_data *vc = vc_cons[fg_console].d;
2378
2379         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2380                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2381
2382                 /*
2383                  * Console switch will fail in console_callback() or
2384                  * change_console() so there is no point scheduling
2385                  * the callback
2386                  *
2387                  * Existing set_console() users don't check the return
2388                  * value so this shouldn't break anything
2389                  */
2390                 return -EINVAL;
2391         }
2392
2393         want_console = nr;
2394         schedule_console_callback();
2395
2396         return 0;
2397 }
2398
2399 struct tty_driver *console_driver;
2400
2401 #ifdef CONFIG_VT_CONSOLE
2402
2403 /*
2404  *      Console on virtual terminal
2405  *
2406  * The console must be locked when we get here.
2407  */
2408
2409 static void vt_console_print(struct console *co, const char *b, unsigned count)
2410 {
2411         struct vc_data *vc = vc_cons[fg_console].d;
2412         unsigned char c;
2413         static DEFINE_SPINLOCK(printing_lock);
2414         const ushort *start;
2415         ushort cnt = 0;
2416         ushort myx;
2417
2418         /* console busy or not yet initialized */
2419         if (!printable)
2420                 return;
2421         if (!spin_trylock(&printing_lock))
2422                 return;
2423
2424         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2425                 vc = vc_cons[kmsg_redirect - 1].d;
2426
2427         /* read `x' only after setting currcons properly (otherwise
2428            the `x' macro will read the x of the foreground console). */
2429         myx = vc->vc_x;
2430
2431         if (!vc_cons_allocated(fg_console)) {
2432                 /* impossible */
2433                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2434                 goto quit;
2435         }
2436
2437         if (vc->vc_mode != KD_TEXT)
2438                 goto quit;
2439
2440         /* undraw cursor first */
2441         if (IS_FG(vc))
2442                 hide_cursor(vc);
2443
2444         start = (ushort *)vc->vc_pos;
2445
2446         /* Contrived structure to try to emulate original need_wrap behaviour
2447          * Problems caused when we have need_wrap set on '\n' character */
2448         while (count--) {
2449                 c = *b++;
2450                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2451                         if (cnt > 0) {
2452                                 if (CON_IS_VISIBLE(vc))
2453                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2454                                 vc->vc_x += cnt;
2455                                 if (vc->vc_need_wrap)
2456                                         vc->vc_x--;
2457                                 cnt = 0;
2458                         }
2459                         if (c == 8) {           /* backspace */
2460                                 bs(vc);
2461                                 start = (ushort *)vc->vc_pos;
2462                                 myx = vc->vc_x;
2463                                 continue;
2464                         }
2465                         if (c != 13)
2466                                 lf(vc);
2467                         cr(vc);
2468                         start = (ushort *)vc->vc_pos;
2469                         myx = vc->vc_x;
2470                         if (c == 10 || c == 13)
2471                                 continue;
2472                 }
2473                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2474                 notify_write(vc, c);
2475                 cnt++;
2476                 if (myx == vc->vc_cols - 1) {
2477                         vc->vc_need_wrap = 1;
2478                         continue;
2479                 }
2480                 vc->vc_pos += 2;
2481                 myx++;
2482         }
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_x == vc->vc_cols) {
2488                         vc->vc_x--;
2489                         vc->vc_need_wrap = 1;
2490                 }
2491         }
2492         set_cursor(vc);
2493         notify_update(vc);
2494
2495 quit:
2496         spin_unlock(&printing_lock);
2497 }
2498
2499 static struct tty_driver *vt_console_device(struct console *c, int *index)
2500 {
2501         *index = c->index ? c->index-1 : fg_console;
2502         return console_driver;
2503 }
2504
2505 static struct console vt_console_driver = {
2506         .name           = "tty",
2507         .write          = vt_console_print,
2508         .device         = vt_console_device,
2509         .unblank        = unblank_screen,
2510         .flags          = CON_PRINTBUFFER,
2511         .index          = -1,
2512 };
2513 #endif
2514
2515 /*
2516  *      Handling of Linux-specific VC ioctls
2517  */
2518
2519 /*
2520  * Generally a bit racy with respect to console_sem().
2521  *
2522  * There are some functions which don't need it.
2523  *
2524  * There are some functions which can sleep for arbitrary periods
2525  * (paste_selection) but we don't need the lock there anyway.
2526  *
2527  * set_selection has locking, and definitely needs it
2528  */
2529
2530 int tioclinux(struct tty_struct *tty, unsigned long arg)
2531 {
2532         char type, data;
2533         char __user *p = (char __user *)arg;
2534         int lines;
2535         int ret;
2536
2537         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2538                 return -EINVAL;
2539         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2540                 return -EPERM;
2541         if (get_user(type, p))
2542                 return -EFAULT;
2543         ret = 0;
2544
2545         lock_kernel();
2546
2547         switch (type)
2548         {
2549                 case TIOCL_SETSEL:
2550                         acquire_console_sem();
2551                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2552                         release_console_sem();
2553                         break;
2554                 case TIOCL_PASTESEL:
2555                         ret = paste_selection(tty);
2556                         break;
2557                 case TIOCL_UNBLANKSCREEN:
2558                         acquire_console_sem();
2559                         unblank_screen();
2560                         release_console_sem();
2561                         break;
2562                 case TIOCL_SELLOADLUT:
2563                         ret = sel_loadlut(p);
2564                         break;
2565                 case TIOCL_GETSHIFTSTATE:
2566
2567         /*
2568          * Make it possible to react to Shift+Mousebutton.
2569          * Note that 'shift_state' is an undocumented
2570          * kernel-internal variable; programs not closely
2571          * related to the kernel should not use this.
2572          */
2573                         data = shift_state;
2574                         ret = __put_user(data, p);
2575                         break;
2576                 case TIOCL_GETMOUSEREPORTING:
2577                         data = mouse_reporting();
2578                         ret = __put_user(data, p);
2579                         break;
2580                 case TIOCL_SETVESABLANK:
2581                         ret = set_vesa_blanking(p);
2582                         break;
2583                 case TIOCL_GETKMSGREDIRECT:
2584                         data = kmsg_redirect;
2585                         ret = __put_user(data, p);
2586                         break;
2587                 case TIOCL_SETKMSGREDIRECT:
2588                         if (!capable(CAP_SYS_ADMIN)) {
2589                                 ret = -EPERM;
2590                         } else {
2591                                 if (get_user(data, p+1))
2592                                         ret = -EFAULT;
2593                                 else
2594                                         kmsg_redirect = data;
2595                         }
2596                         break;
2597                 case TIOCL_GETFGCONSOLE:
2598                         ret = fg_console;
2599                         break;
2600                 case TIOCL_SCROLLCONSOLE:
2601                         if (get_user(lines, (s32 __user *)(p+4))) {
2602                                 ret = -EFAULT;
2603                         } else {
2604                                 scrollfront(vc_cons[fg_console].d, lines);
2605                                 ret = 0;
2606                         }
2607                         break;
2608                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2609                         acquire_console_sem();
2610                         ignore_poke = 1;
2611                         do_blank_screen(0);
2612                         release_console_sem();
2613                         break;
2614                 case TIOCL_BLANKEDSCREEN:
2615                         ret = console_blanked;
2616                         break;
2617                 default:
2618                         ret = -EINVAL;
2619                         break;
2620         }
2621         unlock_kernel();
2622         return ret;
2623 }
2624
2625 /*
2626  * /dev/ttyN handling
2627  */
2628
2629 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2630 {
2631         int     retval;
2632
2633         retval = do_con_write(tty, buf, count);
2634         con_flush_chars(tty);
2635
2636         return retval;
2637 }
2638
2639 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2640 {
2641         if (in_interrupt())
2642                 return; /* n_r3964 calls put_char() from interrupt context */
2643         do_con_write(tty, &ch, 1);
2644 }
2645
2646 static int con_write_room(struct tty_struct *tty)
2647 {
2648         if (tty->stopped)
2649                 return 0;
2650         return 4096;            /* No limit, really; we're not buffering */
2651 }
2652
2653 static int con_chars_in_buffer(struct tty_struct *tty)
2654 {
2655         return 0;               /* we're not buffering */
2656 }
2657
2658 /*
2659  * con_throttle and con_unthrottle are only used for
2660  * paste_selection(), which has to stuff in a large number of
2661  * characters...
2662  */
2663 static void con_throttle(struct tty_struct *tty)
2664 {
2665 }
2666
2667 static void con_unthrottle(struct tty_struct *tty)
2668 {
2669         struct vc_data *vc = tty->driver_data;
2670
2671         wake_up_interruptible(&vc->paste_wait);
2672 }
2673
2674 /*
2675  * Turn the Scroll-Lock LED on when the tty is stopped
2676  */
2677 static void con_stop(struct tty_struct *tty)
2678 {
2679         int console_num;
2680         if (!tty)
2681                 return;
2682         console_num = tty->index;
2683         if (!vc_cons_allocated(console_num))
2684                 return;
2685         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2686         set_leds();
2687 }
2688
2689 /*
2690  * Turn the Scroll-Lock LED off when the console is started
2691  */
2692 static void con_start(struct tty_struct *tty)
2693 {
2694         int console_num;
2695         if (!tty)
2696                 return;
2697         console_num = tty->index;
2698         if (!vc_cons_allocated(console_num))
2699                 return;
2700         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2701         set_leds();
2702 }
2703
2704 static void con_flush_chars(struct tty_struct *tty)
2705 {
2706         struct vc_data *vc;
2707
2708         if (in_interrupt())     /* from flush_to_ldisc */
2709                 return;
2710
2711         /* if we race with con_close(), vt may be null */
2712         acquire_console_sem();
2713         vc = tty->driver_data;
2714         if (vc)
2715                 set_cursor(vc);
2716         release_console_sem();
2717 }
2718
2719 /*
2720  * Allocate the console screen memory.
2721  */
2722 static int con_open(struct tty_struct *tty, struct file *filp)
2723 {
2724         unsigned int currcons = tty->index;
2725         int ret = 0;
2726
2727         acquire_console_sem();
2728         if (tty->driver_data == NULL) {
2729                 ret = vc_allocate(currcons);
2730                 if (ret == 0) {
2731                         struct vc_data *vc = vc_cons[currcons].d;
2732                         tty->driver_data = vc;
2733                         vc->vc_tty = tty;
2734
2735                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2736                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2737                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2738                         }
2739                         release_console_sem();
2740                         vcs_make_sysfs(tty);
2741                         return ret;
2742                 }
2743         }
2744         release_console_sem();
2745         return ret;
2746 }
2747
2748 /*
2749  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2750  * and taking a ref against the tty while we're in the process of forgetting
2751  * about it and cleaning things up.
2752  *
2753  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2754  */
2755 static void con_close(struct tty_struct *tty, struct file *filp)
2756 {
2757         mutex_lock(&tty_mutex);
2758         acquire_console_sem();
2759         if (tty && tty->count == 1) {
2760                 struct vc_data *vc = tty->driver_data;
2761
2762                 if (vc)
2763                         vc->vc_tty = NULL;
2764                 tty->driver_data = NULL;
2765                 release_console_sem();
2766                 vcs_remove_sysfs(tty);
2767                 mutex_unlock(&tty_mutex);
2768                 /*
2769                  * tty_mutex is released, but we still hold BKL, so there is
2770                  * still exclusion against init_dev()
2771                  */
2772                 return;
2773         }
2774         release_console_sem();
2775         mutex_unlock(&tty_mutex);
2776 }
2777
2778 static int default_italic_color    = 2; // green (ASCII)
2779 static int default_underline_color = 3; // cyan (ASCII)
2780 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2781 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2782
2783 static void vc_init(struct vc_data *vc, unsigned int rows,
2784                     unsigned int cols, int do_clear)
2785 {
2786         int j, k ;
2787
2788         vc->vc_cols = cols;
2789         vc->vc_rows = rows;
2790         vc->vc_size_row = cols << 1;
2791         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2792
2793         set_origin(vc);
2794         vc->vc_pos = vc->vc_origin;
2795         reset_vc(vc);
2796         for (j=k=0; j<16; j++) {
2797                 vc->vc_palette[k++] = default_red[j] ;
2798                 vc->vc_palette[k++] = default_grn[j] ;
2799                 vc->vc_palette[k++] = default_blu[j] ;
2800         }
2801         vc->vc_def_color       = 0x07;   /* white */
2802         vc->vc_ulcolor         = default_underline_color;
2803         vc->vc_itcolor         = default_italic_color;
2804         vc->vc_halfcolor       = 0x08;   /* grey */
2805         init_waitqueue_head(&vc->paste_wait);
2806         reset_terminal(vc, do_clear);
2807 }
2808
2809 /*
2810  * This routine initializes console interrupts, and does nothing
2811  * else. If you want the screen to clear, call tty_write with
2812  * the appropriate escape-sequence.
2813  */
2814
2815 static int __init con_init(void)
2816 {
2817         const char *display_desc = NULL;
2818         struct vc_data *vc;
2819         unsigned int currcons = 0, i;
2820
2821         acquire_console_sem();
2822
2823         if (conswitchp)
2824                 display_desc = conswitchp->con_startup();
2825         if (!display_desc) {
2826                 fg_console = 0;
2827                 release_console_sem();
2828                 return 0;
2829         }
2830
2831         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2832                 struct con_driver *con_driver = &registered_con_driver[i];
2833
2834                 if (con_driver->con == NULL) {
2835                         con_driver->con = conswitchp;
2836                         con_driver->desc = display_desc;
2837                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2838                         con_driver->first = 0;
2839                         con_driver->last = MAX_NR_CONSOLES - 1;
2840                         break;
2841                 }
2842         }
2843
2844         for (i = 0; i < MAX_NR_CONSOLES; i++)
2845                 con_driver_map[i] = conswitchp;
2846
2847         if (blankinterval) {
2848                 blank_state = blank_normal_wait;
2849                 mod_timer(&console_timer, jiffies + blankinterval);
2850         }
2851
2852         /*
2853          * kmalloc is not running yet - we use the bootmem allocator.
2854          */
2855         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2856                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2857                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2858                 visual_init(vc, currcons, 1);
2859                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2860                 vc->vc_kmalloced = 0;
2861                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2862                         currcons || !vc->vc_sw->con_save_screen);
2863         }
2864         currcons = fg_console = 0;
2865         master_display_fg = vc = vc_cons[currcons].d;
2866         set_origin(vc);
2867         save_screen(vc);
2868         gotoxy(vc, vc->vc_x, vc->vc_y);
2869         csi_J(vc, 0);
2870         update_screen(vc);
2871         printk("Console: %s %s %dx%d",
2872                 vc->vc_can_do_color ? "colour" : "mono",
2873                 display_desc, vc->vc_cols, vc->vc_rows);
2874         printable = 1;
2875         printk("\n");
2876
2877         release_console_sem();
2878
2879 #ifdef CONFIG_VT_CONSOLE
2880         register_console(&vt_console_driver);
2881 #endif
2882         return 0;
2883 }
2884 console_initcall(con_init);
2885
2886 static const struct tty_operations con_ops = {
2887         .open = con_open,
2888         .close = con_close,
2889         .write = con_write,
2890         .write_room = con_write_room,
2891         .put_char = con_put_char,
2892         .flush_chars = con_flush_chars,
2893         .chars_in_buffer = con_chars_in_buffer,
2894         .ioctl = vt_ioctl,
2895         .stop = con_stop,
2896         .start = con_start,
2897         .throttle = con_throttle,
2898         .unthrottle = con_unthrottle,
2899 };
2900
2901 int __init vty_init(void)
2902 {
2903         vcs_init();
2904
2905         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2906         if (!console_driver)
2907                 panic("Couldn't allocate console driver\n");
2908         console_driver->owner = THIS_MODULE;
2909         console_driver->name = "tty";
2910         console_driver->name_base = 1;
2911         console_driver->major = TTY_MAJOR;
2912         console_driver->minor_start = 1;
2913         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2914         console_driver->init_termios = tty_std_termios;
2915         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2916         tty_set_operations(console_driver, &con_ops);
2917         if (tty_register_driver(console_driver))
2918                 panic("Couldn't register console driver\n");
2919
2920         kbd_init();
2921         console_map_init();
2922 #ifdef CONFIG_PROM_CONSOLE
2923         prom_con_init();
2924 #endif
2925 #ifdef CONFIG_MDA_CONSOLE
2926         mda_console_init();
2927 #endif
2928         return 0;
2929 }
2930
2931 #ifndef VT_SINGLE_DRIVER
2932 #include <linux/device.h>
2933
2934 static struct class *vtconsole_class;
2935
2936 static int bind_con_driver(const struct consw *csw, int first, int last,
2937                            int deflt)
2938 {
2939         struct module *owner = csw->owner;
2940         const char *desc = NULL;
2941         struct con_driver *con_driver;
2942         int i, j = -1, k = -1, retval = -ENODEV;
2943
2944         if (!try_module_get(owner))
2945                 return -ENODEV;
2946
2947         acquire_console_sem();
2948
2949         /* check if driver is registered */
2950         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2951                 con_driver = &registered_con_driver[i];
2952
2953                 if (con_driver->con == csw) {
2954                         desc = con_driver->desc;
2955                         retval = 0;
2956                         break;
2957                 }
2958         }
2959
2960         if (retval)
2961                 goto err;
2962
2963         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2964                 csw->con_startup();
2965                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2966         }
2967
2968         if (deflt) {
2969                 if (conswitchp)
2970                         module_put(conswitchp->owner);
2971
2972                 __module_get(owner);
2973                 conswitchp = csw;
2974         }
2975
2976         first = max(first, con_driver->first);
2977         last = min(last, con_driver->last);
2978
2979         for (i = first; i <= last; i++) {
2980                 int old_was_color;
2981                 struct vc_data *vc = vc_cons[i].d;
2982
2983                 if (con_driver_map[i])
2984                         module_put(con_driver_map[i]->owner);
2985                 __module_get(owner);
2986                 con_driver_map[i] = csw;
2987
2988                 if (!vc || !vc->vc_sw)
2989                         continue;
2990
2991                 j = i;
2992
2993                 if (CON_IS_VISIBLE(vc)) {
2994                         k = i;
2995                         save_screen(vc);
2996                 }
2997
2998                 old_was_color = vc->vc_can_do_color;
2999                 vc->vc_sw->con_deinit(vc);
3000                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3001                 visual_init(vc, i, 0);
3002                 set_origin(vc);
3003                 update_attr(vc);
3004
3005                 /* If the console changed between mono <-> color, then
3006                  * the attributes in the screenbuf will be wrong.  The
3007                  * following resets all attributes to something sane.
3008                  */
3009                 if (old_was_color != vc->vc_can_do_color)
3010                         clear_buffer_attributes(vc);
3011         }
3012
3013         printk("Console: switching ");
3014         if (!deflt)
3015                 printk("consoles %d-%d ", first+1, last+1);
3016         if (j >= 0) {
3017                 struct vc_data *vc = vc_cons[j].d;
3018
3019                 printk("to %s %s %dx%d\n",
3020                        vc->vc_can_do_color ? "colour" : "mono",
3021                        desc, vc->vc_cols, vc->vc_rows);
3022
3023                 if (k >= 0) {
3024                         vc = vc_cons[k].d;
3025                         update_screen(vc);
3026                 }
3027         } else
3028                 printk("to %s\n", desc);
3029
3030         retval = 0;
3031 err:
3032         release_console_sem();
3033         module_put(owner);
3034         return retval;
3035 };
3036
3037 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3038 static int con_is_graphics(const struct consw *csw, int first, int last)
3039 {
3040         int i, retval = 0;
3041
3042         for (i = first; i <= last; i++) {
3043                 struct vc_data *vc = vc_cons[i].d;
3044
3045                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3046                         retval = 1;
3047                         break;
3048                 }
3049         }
3050
3051         return retval;
3052 }
3053
3054 /**
3055  * unbind_con_driver - unbind a console driver
3056  * @csw: pointer to console driver to unregister
3057  * @first: first in range of consoles that @csw should be unbound from
3058  * @last: last in range of consoles that @csw should be unbound from
3059  * @deflt: should next bound console driver be default after @csw is unbound?
3060  *
3061  * To unbind a driver from all possible consoles, pass 0 as @first and
3062  * %MAX_NR_CONSOLES as @last.
3063  *
3064  * @deflt controls whether the console that ends up replacing @csw should be
3065  * the default console.
3066  *
3067  * RETURNS:
3068  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3069  * or 0 on success.
3070  */
3071 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3072 {
3073         struct module *owner = csw->owner;
3074         const struct consw *defcsw = NULL;
3075         struct con_driver *con_driver = NULL, *con_back = NULL;
3076         int i, retval = -ENODEV;
3077
3078         if (!try_module_get(owner))
3079                 return -ENODEV;
3080
3081         acquire_console_sem();
3082
3083         /* check if driver is registered and if it is unbindable */
3084         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3085                 con_driver = &registered_con_driver[i];
3086
3087                 if (con_driver->con == csw &&
3088                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3089                         retval = 0;
3090                         break;
3091                 }
3092         }
3093
3094         if (retval) {
3095                 release_console_sem();
3096                 goto err;
3097         }
3098
3099         retval = -ENODEV;
3100
3101         /* check if backup driver exists */
3102         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3103                 con_back = &registered_con_driver[i];
3104
3105                 if (con_back->con &&
3106                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3107                         defcsw = con_back->con;
3108                         retval = 0;
3109                         break;
3110                 }
3111         }
3112
3113         if (retval) {
3114                 release_console_sem();
3115                 goto err;
3116         }
3117
3118         if (!con_is_bound(csw)) {
3119                 release_console_sem();
3120                 goto err;
3121         }
3122
3123         first = max(first, con_driver->first);
3124         last = min(last, con_driver->last);
3125
3126         for (i = first; i <= last; i++) {
3127                 if (con_driver_map[i] == csw) {
3128                         module_put(csw->owner);
3129                         con_driver_map[i] = NULL;
3130                 }
3131         }
3132
3133         if (!con_is_bound(defcsw)) {
3134                 const struct consw *defconsw = conswitchp;
3135
3136                 defcsw->con_startup();
3137                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3138                 /*
3139                  * vgacon may change the default driver to point
3140                  * to dummycon, we restore it here...
3141                  */
3142                 conswitchp = defconsw;
3143         }
3144
3145         if (!con_is_bound(csw))
3146                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3147
3148         release_console_sem();
3149         /* ignore return value, binding should not fail */
3150         bind_con_driver(defcsw, first, last, deflt);
3151 err:
3152         module_put(owner);
3153         return retval;
3154
3155 }
3156 EXPORT_SYMBOL(unbind_con_driver);
3157
3158 static int vt_bind(struct con_driver *con)
3159 {
3160         const struct consw *defcsw = NULL, *csw = NULL;
3161         int i, more = 1, first = -1, last = -1, deflt = 0;
3162
3163         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3164             con_is_graphics(con->con, con->first, con->last))
3165                 goto err;
3166
3167         csw = con->con;
3168
3169         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3170                 struct con_driver *con = &registered_con_driver[i];
3171
3172                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3173                         defcsw = con->con;
3174                         break;
3175                 }
3176         }
3177
3178         if (!defcsw)
3179                 goto err;
3180
3181         while (more) {
3182                 more = 0;
3183
3184                 for (i = con->first; i <= con->last; i++) {
3185                         if (con_driver_map[i] == defcsw) {
3186                                 if (first == -1)
3187                                         first = i;
3188                                 last = i;
3189                                 more = 1;
3190                         } else if (first != -1)
3191                                 break;
3192                 }
3193
3194                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3195                         deflt = 1;
3196
3197                 if (first != -1)
3198                         bind_con_driver(csw, first, last, deflt);
3199
3200                 first = -1;
3201                 last = -1;
3202                 deflt = 0;
3203         }
3204
3205 err:
3206         return 0;
3207 }
3208
3209 static int vt_unbind(struct con_driver *con)
3210 {
3211         const struct consw *csw = NULL;
3212         int i, more = 1, first = -1, last = -1, deflt = 0;
3213
3214         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3215             con_is_graphics(con->con, con->first, con->last))
3216                 goto err;
3217
3218         csw = con->con;
3219
3220         while (more) {
3221                 more = 0;
3222
3223                 for (i = con->first; i <= con->last; i++) {
3224                         if (con_driver_map[i] == csw) {
3225                                 if (first == -1)
3226                                         first = i;
3227                                 last = i;
3228                                 more = 1;
3229                         } else if (first != -1)
3230                                 break;
3231                 }
3232
3233                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3234                         deflt = 1;
3235
3236                 if (first != -1)
3237                         unbind_con_driver(csw, first, last, deflt);
3238
3239                 first = -1;
3240                 last = -1;
3241                 deflt = 0;
3242         }
3243
3244 err:
3245         return 0;
3246 }
3247 #else
3248 static inline int vt_bind(struct con_driver *con)
3249 {
3250         return 0;
3251 }
3252 static inline int vt_unbind(struct con_driver *con)
3253 {
3254         return 0;
3255 }
3256 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3257
3258 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3259                           const char *buf, size_t count)
3260 {
3261         struct con_driver *con = dev_get_drvdata(dev);
3262         int bind = simple_strtoul(buf, NULL, 0);
3263
3264         if (bind)
3265                 vt_bind(con);
3266         else
3267                 vt_unbind(con);
3268
3269         return count;
3270 }
3271
3272 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3273                          char *buf)
3274 {
3275         struct con_driver *con = dev_get_drvdata(dev);
3276         int bind = con_is_bound(con->con);
3277
3278         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3279 }
3280
3281 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3282                          char *buf)
3283 {
3284         struct con_driver *con = dev_get_drvdata(dev);
3285
3286         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3287                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3288                          con->desc);
3289
3290 }
3291
3292 static struct device_attribute device_attrs[] = {
3293         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3294         __ATTR(name, S_IRUGO, show_name, NULL),
3295 };
3296
3297 static int vtconsole_init_device(struct con_driver *con)
3298 {
3299         int i;
3300         int error = 0;
3301
3302         con->flag |= CON_DRIVER_FLAG_ATTR;
3303         dev_set_drvdata(con->dev, con);
3304         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3305                 error = device_create_file(con->dev, &device_attrs[i]);
3306                 if (error)
3307                         break;
3308         }
3309
3310         if (error) {
3311                 while (--i >= 0)
3312                         device_remove_file(con->dev, &device_attrs[i]);
3313                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3314         }
3315
3316         return error;
3317 }
3318
3319 static void vtconsole_deinit_device(struct con_driver *con)
3320 {
3321         int i;
3322
3323         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3324                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3325                         device_remove_file(con->dev, &device_attrs[i]);
3326                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3327         }
3328 }
3329
3330 /**
3331  * con_is_bound - checks if driver is bound to the console
3332  * @csw: console driver
3333  *
3334  * RETURNS: zero if unbound, nonzero if bound
3335  *
3336  * Drivers can call this and if zero, they should release
3337  * all resources allocated on con_startup()
3338  */
3339 int con_is_bound(const struct consw *csw)
3340 {
3341         int i, bound = 0;
3342
3343         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3344                 if (con_driver_map[i] == csw) {
3345                         bound = 1;
3346                         break;
3347                 }
3348         }
3349
3350         return bound;
3351 }
3352 EXPORT_SYMBOL(con_is_bound);
3353
3354 /**
3355  * register_con_driver - register console driver to console layer
3356  * @csw: console driver
3357  * @first: the first console to take over, minimum value is 0
3358  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3359  *
3360  * DESCRIPTION: This function registers a console driver which can later
3361  * bind to a range of consoles specified by @first and @last. It will
3362  * also initialize the console driver by calling con_startup().
3363  */
3364 int register_con_driver(const struct consw *csw, int first, int last)
3365 {
3366         struct module *owner = csw->owner;
3367         struct con_driver *con_driver;
3368         const char *desc;
3369         int i, retval = 0;
3370
3371         if (!try_module_get(owner))
3372                 return -ENODEV;
3373
3374         acquire_console_sem();
3375
3376         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3377                 con_driver = &registered_con_driver[i];
3378
3379                 /* already registered */
3380                 if (con_driver->con == csw)
3381                         retval = -EINVAL;
3382         }
3383
3384         if (retval)
3385                 goto err;
3386
3387         desc = csw->con_startup();
3388
3389         if (!desc)
3390                 goto err;
3391
3392         retval = -EINVAL;
3393
3394         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3395                 con_driver = &registered_con_driver[i];
3396
3397                 if (con_driver->con == NULL) {
3398                         con_driver->con = csw;
3399                         con_driver->desc = desc;
3400                         con_driver->node = i;
3401                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3402                                            CON_DRIVER_FLAG_INIT;
3403                         con_driver->first = first;
3404                         con_driver->last = last;
3405                         retval = 0;
3406                         break;
3407                 }
3408         }
3409
3410         if (retval)
3411                 goto err;
3412
3413         con_driver->dev = device_create(vtconsole_class, NULL,
3414                                         MKDEV(0, con_driver->node),
3415                                         "vtcon%i", con_driver->node);
3416
3417         if (IS_ERR(con_driver->dev)) {
3418                 printk(KERN_WARNING "Unable to create device for %s; "
3419                        "errno = %ld\n", con_driver->desc,
3420                        PTR_ERR(con_driver->dev));
3421                 con_driver->dev = NULL;
3422         } else {
3423                 vtconsole_init_device(con_driver);
3424         }
3425
3426 err:
3427         release_console_sem();
3428         module_put(owner);
3429         return retval;
3430 }
3431 EXPORT_SYMBOL(register_con_driver);
3432
3433 /**
3434  * unregister_con_driver - unregister console driver from console layer
3435  * @csw: console driver
3436  *
3437  * DESCRIPTION: All drivers that registers to the console layer must
3438  * call this function upon exit, or if the console driver is in a state
3439  * where it won't be able to handle console services, such as the
3440  * framebuffer console without loaded framebuffer drivers.
3441  *
3442  * The driver must unbind first prior to unregistration.
3443  */
3444 int unregister_con_driver(const struct consw *csw)
3445 {
3446         int i, retval = -ENODEV;
3447
3448         acquire_console_sem();
3449
3450         /* cannot unregister a bound driver */
3451         if (con_is_bound(csw))
3452                 goto err;
3453
3454         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3455                 struct con_driver *con_driver = &registered_con_driver[i];
3456
3457                 if (con_driver->con == csw &&
3458                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3459                         vtconsole_deinit_device(con_driver);
3460                         device_destroy(vtconsole_class,
3461                                        MKDEV(0, con_driver->node));
3462                         con_driver->con = NULL;
3463                         con_driver->desc = NULL;
3464                         con_driver->dev = NULL;
3465                         con_driver->node = 0;
3466                         con_driver->flag = 0;
3467                         con_driver->first = 0;
3468                         con_driver->last = 0;
3469                         retval = 0;
3470                         break;
3471                 }
3472         }
3473 err:
3474         release_console_sem();
3475         return retval;
3476 }
3477 EXPORT_SYMBOL(unregister_con_driver);
3478
3479 /*
3480  *      If we support more console drivers, this function is used
3481  *      when a driver wants to take over some existing consoles
3482  *      and become default driver for newly opened ones.
3483  *
3484  *      take_over_console is basically a register followed by unbind
3485  */
3486 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3487 {
3488         int err;
3489
3490         err = register_con_driver(csw, first, last);
3491
3492         if (!err)
3493                 bind_con_driver(csw, first, last, deflt);
3494
3495         return err;
3496 }
3497
3498 /*
3499  * give_up_console is a wrapper to unregister_con_driver. It will only
3500  * work if driver is fully unbound.
3501  */
3502 void give_up_console(const struct consw *csw)
3503 {
3504         unregister_con_driver(csw);
3505 }
3506
3507 static int __init vtconsole_class_init(void)
3508 {
3509         int i;
3510
3511         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3512         if (IS_ERR(vtconsole_class)) {
3513                 printk(KERN_WARNING "Unable to create vt console class; "
3514                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3515                 vtconsole_class = NULL;
3516         }
3517
3518         /* Add system drivers to sysfs */
3519         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3520                 struct con_driver *con = &registered_con_driver[i];
3521
3522                 if (con->con && !con->dev) {
3523                         con->dev = device_create(vtconsole_class, NULL,
3524                                                  MKDEV(0, con->node),
3525                                                  "vtcon%i", con->node);
3526
3527                         if (IS_ERR(con->dev)) {
3528                                 printk(KERN_WARNING "Unable to create "
3529                                        "device for %s; errno = %ld\n",
3530                                        con->desc, PTR_ERR(con->dev));
3531                                 con->dev = NULL;
3532                         } else {
3533                                 vtconsole_init_device(con);
3534                         }
3535                 }
3536         }
3537
3538         return 0;
3539 }
3540 postcore_initcall(vtconsole_class_init);
3541
3542 #endif
3543
3544 /*
3545  *      Screen blanking
3546  */
3547
3548 static int set_vesa_blanking(char __user *p)
3549 {
3550         unsigned int mode;
3551
3552         if (get_user(mode, p + 1))
3553                 return -EFAULT;
3554
3555         vesa_blank_mode = (mode < 4) ? mode : 0;
3556         return 0;
3557 }
3558
3559 void do_blank_screen(int entering_gfx)
3560 {
3561         struct vc_data *vc = vc_cons[fg_console].d;
3562         int i;
3563
3564         WARN_CONSOLE_UNLOCKED();
3565
3566         if (console_blanked) {
3567                 if (blank_state == blank_vesa_wait) {
3568                         blank_state = blank_off;
3569                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3570                 }
3571                 return;
3572         }
3573
3574         /* entering graphics mode? */
3575         if (entering_gfx) {
3576                 hide_cursor(vc);
3577                 save_screen(vc);
3578                 vc->vc_sw->con_blank(vc, -1, 1);
3579                 console_blanked = fg_console + 1;
3580                 blank_state = blank_off;
3581                 set_origin(vc);
3582                 return;
3583         }
3584
3585         if (blank_state != blank_normal_wait)
3586                 return;
3587         blank_state = blank_off;
3588
3589         /* don't blank graphics */
3590         if (vc->vc_mode != KD_TEXT) {
3591                 console_blanked = fg_console + 1;
3592                 return;
3593         }
3594
3595         hide_cursor(vc);
3596         del_timer_sync(&console_timer);
3597         blank_timer_expired = 0;
3598
3599         save_screen(vc);
3600         /* In case we need to reset origin, blanking hook returns 1 */
3601         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3602         console_blanked = fg_console + 1;
3603         if (i)
3604                 set_origin(vc);
3605
3606         if (console_blank_hook && console_blank_hook(1))
3607                 return;
3608
3609         if (vesa_off_interval && vesa_blank_mode) {
3610                 blank_state = blank_vesa_wait;
3611                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3612         }
3613 }
3614 EXPORT_SYMBOL(do_blank_screen);
3615
3616 /*
3617  * Called by timer as well as from vt_console_driver
3618  */
3619 void do_unblank_screen(int leaving_gfx)
3620 {
3621         struct vc_data *vc;
3622
3623         /* This should now always be called from a "sane" (read: can schedule)
3624          * context for the sake of the low level drivers, except in the special
3625          * case of oops_in_progress
3626          */
3627         if (!oops_in_progress)
3628                 might_sleep();
3629
3630         WARN_CONSOLE_UNLOCKED();
3631
3632         ignore_poke = 0;
3633         if (!console_blanked)
3634                 return;
3635         if (!vc_cons_allocated(fg_console)) {
3636                 /* impossible */
3637                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3638                 return;
3639         }
3640         vc = vc_cons[fg_console].d;
3641         if (vc->vc_mode != KD_TEXT)
3642                 return; /* but leave console_blanked != 0 */
3643
3644         if (blankinterval) {
3645                 mod_timer(&console_timer, jiffies + blankinterval);
3646                 blank_state = blank_normal_wait;
3647         }
3648
3649         console_blanked = 0;
3650         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3651                 /* Low-level driver cannot restore -> do it ourselves */
3652                 update_screen(vc);
3653         if (console_blank_hook)
3654                 console_blank_hook(0);
3655         set_palette(vc);
3656         set_cursor(vc);
3657 }
3658 EXPORT_SYMBOL(do_unblank_screen);
3659
3660 /*
3661  * This is called by the outside world to cause a forced unblank, mostly for
3662  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3663  * call it with 1 as an argument and so force a mode restore... that may kill
3664  * X or at least garbage the screen but would also make the Oops visible...
3665  */
3666 void unblank_screen(void)
3667 {
3668         do_unblank_screen(0);
3669 }
3670
3671 /*
3672  * We defer the timer blanking to work queue so it can take the console mutex
3673  * (console operations can still happen at irq time, but only from printk which
3674  * has the console mutex. Not perfect yet, but better than no locking
3675  */
3676 static void blank_screen_t(unsigned long dummy)
3677 {
3678         if (unlikely(!keventd_up())) {
3679                 mod_timer(&console_timer, jiffies + blankinterval);
3680                 return;
3681         }
3682         blank_timer_expired = 1;
3683         schedule_work(&console_work);
3684 }
3685
3686 void poke_blanked_console(void)
3687 {
3688         WARN_CONSOLE_UNLOCKED();
3689
3690         /* Add this so we quickly catch whoever might call us in a non
3691          * safe context. Nowadays, unblank_screen() isn't to be called in
3692          * atomic contexts and is allowed to schedule (with the special case
3693          * of oops_in_progress, but that isn't of any concern for this
3694          * function. --BenH.
3695          */
3696         might_sleep();
3697
3698         /* This isn't perfectly race free, but a race here would be mostly harmless,
3699          * at worse, we'll do a spurrious blank and it's unlikely
3700          */
3701         del_timer(&console_timer);
3702         blank_timer_expired = 0;
3703
3704         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3705                 return;
3706         if (console_blanked)
3707                 unblank_screen();
3708         else if (blankinterval) {
3709                 mod_timer(&console_timer, jiffies + blankinterval);
3710                 blank_state = blank_normal_wait;
3711         }
3712 }
3713
3714 /*
3715  *      Palettes
3716  */
3717
3718 static void set_palette(struct vc_data *vc)
3719 {
3720         WARN_CONSOLE_UNLOCKED();
3721
3722         if (vc->vc_mode != KD_GRAPHICS)
3723                 vc->vc_sw->con_set_palette(vc, color_table);
3724 }
3725
3726 static int set_get_cmap(unsigned char __user *arg, int set)
3727 {
3728     int i, j, k;
3729
3730     WARN_CONSOLE_UNLOCKED();
3731
3732     for (i = 0; i < 16; i++)
3733         if (set) {
3734             get_user(default_red[i], arg++);
3735             get_user(default_grn[i], arg++);
3736             get_user(default_blu[i], arg++);
3737         } else {
3738             put_user(default_red[i], arg++);
3739             put_user(default_grn[i], arg++);
3740             put_user(default_blu[i], arg++);
3741         }
3742     if (set) {
3743         for (i = 0; i < MAX_NR_CONSOLES; i++)
3744             if (vc_cons_allocated(i)) {
3745                 for (j = k = 0; j < 16; j++) {
3746                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3747                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3748                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3749                 }
3750                 set_palette(vc_cons[i].d);
3751             }
3752     }
3753     return 0;
3754 }
3755
3756 /*
3757  * Load palette into the DAC registers. arg points to a colour
3758  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3759  */
3760
3761 int con_set_cmap(unsigned char __user *arg)
3762 {
3763         int rc;
3764
3765         acquire_console_sem();
3766         rc = set_get_cmap (arg,1);
3767         release_console_sem();
3768
3769         return rc;
3770 }
3771
3772 int con_get_cmap(unsigned char __user *arg)
3773 {
3774         int rc;
3775
3776         acquire_console_sem();
3777         rc = set_get_cmap (arg,0);
3778         release_console_sem();
3779
3780         return rc;
3781 }
3782
3783 void reset_palette(struct vc_data *vc)
3784 {
3785         int j, k;
3786         for (j=k=0; j<16; j++) {
3787                 vc->vc_palette[k++] = default_red[j];
3788                 vc->vc_palette[k++] = default_grn[j];
3789                 vc->vc_palette[k++] = default_blu[j];
3790         }
3791         set_palette(vc);
3792 }
3793
3794 /*
3795  *  Font switching
3796  *
3797  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3798  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3799  *  depending on width) reserved for each character which is kinda wasty, but
3800  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3801  *  is upto the actual low-level console-driver convert data into its favorite
3802  *  format (maybe we should add a `fontoffset' field to the `display'
3803  *  structure so we won't have to convert the fontdata all the time.
3804  *  /Jes
3805  */
3806
3807 #define max_font_size 65536
3808
3809 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3810 {
3811         struct console_font font;
3812         int rc = -EINVAL;
3813         int c;
3814
3815         if (vc->vc_mode != KD_TEXT)
3816                 return -EINVAL;
3817
3818         if (op->data) {
3819                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3820                 if (!font.data)
3821                         return -ENOMEM;
3822         } else
3823                 font.data = NULL;
3824
3825         acquire_console_sem();
3826         if (vc->vc_sw->con_font_get)
3827                 rc = vc->vc_sw->con_font_get(vc, &font);
3828         else
3829                 rc = -ENOSYS;
3830         release_console_sem();
3831
3832         if (rc)
3833                 goto out;
3834
3835         c = (font.width+7)/8 * 32 * font.charcount;
3836
3837         if (op->data && font.charcount > op->charcount)
3838                 rc = -ENOSPC;
3839         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3840                 if (font.width > op->width || font.height > op->height)
3841                         rc = -ENOSPC;
3842         } else {
3843                 if (font.width != 8)
3844                         rc = -EIO;
3845                 else if ((op->height && font.height > op->height) ||
3846                          font.height > 32)
3847                         rc = -ENOSPC;
3848         }
3849         if (rc)
3850                 goto out;
3851
3852         op->height = font.height;
3853         op->width = font.width;
3854         op->charcount = font.charcount;
3855
3856         if (op->data && copy_to_user(op->data, font.data, c))
3857                 rc = -EFAULT;
3858
3859 out:
3860         kfree(font.data);
3861         return rc;
3862 }
3863
3864 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3865 {
3866         struct console_font font;
3867         int rc = -EINVAL;
3868         int size;
3869
3870         if (vc->vc_mode != KD_TEXT)
3871                 return -EINVAL;
3872         if (!op->data)
3873                 return -EINVAL;
3874         if (op->charcount > 512)
3875                 return -EINVAL;
3876         if (!op->height) {              /* Need to guess font height [compat] */
3877                 int h, i;
3878                 u8 __user *charmap = op->data;
3879                 u8 tmp;
3880
3881                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3882                    so that we can get rid of this soon */
3883                 if (!(op->flags & KD_FONT_FLAG_OLD))
3884                         return -EINVAL;
3885                 for (h = 32; h > 0; h--)
3886                         for (i = 0; i < op->charcount; i++) {
3887                                 if (get_user(tmp, &charmap[32*i+h-1]))
3888                                         return -EFAULT;
3889                                 if (tmp)
3890                                         goto nonzero;
3891                         }
3892                 return -EINVAL;
3893         nonzero:
3894                 op->height = h;
3895         }
3896         if (op->width <= 0 || op->width > 32 || op->height > 32)
3897                 return -EINVAL;
3898         size = (op->width+7)/8 * 32 * op->charcount;
3899         if (size > max_font_size)
3900                 return -ENOSPC;
3901         font.charcount = op->charcount;
3902         font.height = op->height;
3903         font.width = op->width;
3904         font.data = kmalloc(size, GFP_KERNEL);
3905         if (!font.data)
3906                 return -ENOMEM;
3907         if (copy_from_user(font.data, op->data, size)) {
3908                 kfree(font.data);
3909                 return -EFAULT;
3910         }
3911         acquire_console_sem();
3912         if (vc->vc_sw->con_font_set)
3913                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3914         else
3915                 rc = -ENOSYS;
3916         release_console_sem();
3917         kfree(font.data);
3918         return rc;
3919 }
3920
3921 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3922 {
3923         struct console_font font = {.width = op->width, .height = op->height};
3924         char name[MAX_FONT_NAME];
3925         char *s = name;
3926         int rc;
3927
3928         if (vc->vc_mode != KD_TEXT)
3929                 return -EINVAL;
3930
3931         if (!op->data)
3932                 s = NULL;
3933         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3934                 return -EFAULT;
3935         else
3936                 name[MAX_FONT_NAME - 1] = 0;
3937
3938         acquire_console_sem();
3939         if (vc->vc_sw->con_font_default)
3940                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3941         else
3942                 rc = -ENOSYS;
3943         release_console_sem();
3944         if (!rc) {
3945                 op->width = font.width;
3946                 op->height = font.height;
3947         }
3948         return rc;
3949 }
3950
3951 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3952 {
3953         int con = op->height;
3954         int rc;
3955
3956         if (vc->vc_mode != KD_TEXT)
3957                 return -EINVAL;
3958
3959         acquire_console_sem();
3960         if (!vc->vc_sw->con_font_copy)
3961                 rc = -ENOSYS;
3962         else if (con < 0 || !vc_cons_allocated(con))
3963                 rc = -ENOTTY;
3964         else if (con == vc->vc_num)     /* nothing to do */
3965                 rc = 0;
3966         else
3967                 rc = vc->vc_sw->con_font_copy(vc, con);
3968         release_console_sem();
3969         return rc;
3970 }
3971
3972 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3973 {
3974         switch (op->op) {
3975         case KD_FONT_OP_SET:
3976                 return con_font_set(vc, op);
3977         case KD_FONT_OP_GET:
3978                 return con_font_get(vc, op);
3979         case KD_FONT_OP_SET_DEFAULT:
3980                 return con_font_default(vc, op);
3981         case KD_FONT_OP_COPY:
3982                 return con_font_copy(vc, op);
3983         }
3984         return -ENOSYS;
3985 }
3986
3987 /*
3988  *      Interface exported to selection and vcs.
3989  */
3990
3991 /* used by selection */
3992 u16 screen_glyph(struct vc_data *vc, int offset)
3993 {
3994         u16 w = scr_readw(screenpos(vc, offset, 1));
3995         u16 c = w & 0xff;
3996
3997         if (w & vc->vc_hi_font_mask)
3998                 c |= 0x100;
3999         return c;
4000 }
4001
4002 /* used by vcs - note the word offset */
4003 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4004 {
4005         return screenpos(vc, 2 * w_offset, viewed);
4006 }
4007
4008 void getconsxy(struct vc_data *vc, unsigned char *p)
4009 {
4010         p[0] = vc->vc_x;
4011         p[1] = vc->vc_y;
4012 }
4013
4014 void putconsxy(struct vc_data *vc, unsigned char *p)
4015 {
4016         hide_cursor(vc);
4017         gotoxy(vc, p[0], p[1]);
4018         set_cursor(vc);
4019 }
4020
4021 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4022 {
4023         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4024                 return softcursor_original;
4025         return scr_readw(org);
4026 }
4027
4028 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4029 {
4030         scr_writew(val, org);
4031         if ((unsigned long)org == vc->vc_pos) {
4032                 softcursor_original = -1;
4033                 add_softcursor(vc);
4034         }
4035 }
4036
4037 /*
4038  *      Visible symbols for modules
4039  */
4040
4041 EXPORT_SYMBOL(color_table);
4042 EXPORT_SYMBOL(default_red);
4043 EXPORT_SYMBOL(default_grn);
4044 EXPORT_SYMBOL(default_blu);
4045 EXPORT_SYMBOL(update_region);
4046 EXPORT_SYMBOL(redraw_screen);
4047 EXPORT_SYMBOL(vc_resize);
4048 EXPORT_SYMBOL(vc_lock_resize);
4049 EXPORT_SYMBOL(fg_console);
4050 EXPORT_SYMBOL(console_blank_hook);
4051 EXPORT_SYMBOL(console_blanked);
4052 EXPORT_SYMBOL(vc_cons);
4053 #ifndef VT_SINGLE_DRIVER
4054 EXPORT_SYMBOL(take_over_console);
4055 EXPORT_SYMBOL(give_up_console);
4056 #endif