drivers/char/vt.c

   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton <andrewm@uow.edu.au>
  63  *
  64  * Removed console_lock, enabled interrupts across all console operations
  65  * 13 March 2001, Andrew Morton
  66  *
  67  * Fixed UTF-8 mode so alternate charset modes always work according
  68  * to control sequences interpreted in do_con_trol function
  69  * preserving backward VT100 semigraphics compatibility,
  70  * malformed UTF sequences represented as sequences of replacement glyphs,
  71  * original codes or '?' as a last resort if replacement glyph is undefined
  72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  73  */
  74
  75 #include <linux/module.h>
  76 #include <linux/types.h>
  77 #include <linux/sched.h>
  78 #include <linux/tty.h>
  79 #include <linux/tty_flip.h>
  80 #include <linux/kernel.h>
  81 #include <linux/string.h>
  82 #include <linux/errno.h>
  83 #include <linux/kd.h>
  84 #include <linux/slab.h>
  85 #include <linux/major.h>
  86 #include <linux/mm.h>
  87 #include <linux/console.h>
  88 #include <linux/init.h>
  89 #include <linux/mutex.h>
  90 #include <linux/vt_kern.h>
  91 #include <linux/selection.h>
  92 #include <linux/tiocl.h>
  93 #include <linux/kbd_kern.h>
  94 #include <linux/consolemap.h>
  95 #include <linux/timer.h>
  96 #include <linux/interrupt.h>
  97 #include <linux/workqueue.h>
  98 #include <linux/bootmem.h>
  99 #include <linux/pm.h>
 100 #include <linux/font.h>
 101 #include <linux/bitops.h>
 102 #include <linux/notifier.h>
 103
 104 #include <asm/io.h>
 105 #include <asm/system.h>
 106 #include <asm/uaccess.h>
 107
 108 #define MAX_NR_CON_DRIVER 16
 109
 110 #define CON_DRIVER_FLAG_MODULE 1
 111 #define CON_DRIVER_FLAG_INIT   2
 112 #define CON_DRIVER_FLAG_ATTR   4
 113
 114 struct con_driver {
 115         const struct consw *con;
 116         const char *desc;
 117         struct device *dev;
 118         int node;
 119         int first;
 120         int last;
 121         int flag;
 122 };
 123
 124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 125 const struct consw *conswitchp;
 126
 127 /* A bitmap for codes <32. A bit of 1 indicates that the code
 128  * corresponding to that bit number invokes some special action
 129  * (such as cursor movement) and should not be displayed as a
 130  * glyph unless the disp_ctrl mode is explicitly enabled.
 131  */
 132 #define CTRL_ACTION 0x0d00ff81
 133 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 134
 135 /*
 136  * Here is the default bell parameters: 750HZ, 1/8th of a second
 137  */
 138 #define DEFAULT_BELL_PITCH      750
 139 #define DEFAULT_BELL_DURATION   (HZ/8)
 140
 141 struct vc vc_cons [MAX_NR_CONSOLES];
 142
 143 #ifndef VT_SINGLE_DRIVER
 144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 145 #endif
 146
 147 static int con_open(struct tty_struct *, struct file *);
 148 static void vc_init(struct vc_data *vc, unsigned int rows,
 149                     unsigned int cols, int do_clear);
 150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 151 static void save_cur(struct vc_data *vc);
 152 static void reset_terminal(struct vc_data *vc, int do_clear);
 153 static void con_flush_chars(struct tty_struct *tty);
 154 static int set_vesa_blanking(char __user *p);
 155 static void set_cursor(struct vc_data *vc);
 156 static void hide_cursor(struct vc_data *vc);
 157 static void console_callback(struct work_struct *ignored);
 158 static void blank_screen_t(unsigned long dummy);
 159 static void set_palette(struct vc_data *vc);
 160
 161 static int printable;           /* Is console ready for printing? */
 162 int default_utf8 = true;
 163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 164
 165 /*
 166  * ignore_poke: don't unblank the screen when things are typed.  This is
 167  * mainly for the privacy of braille terminal users.
 168  */
 169 static int ignore_poke;
 170
 171 int do_poke_blanked_console;
 172 int console_blanked;
 173
 174 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 175 static int blankinterval = 10*60*HZ;
 176 static int vesa_off_interval;
 177
 178 static DECLARE_WORK(console_work, console_callback);
 179
 180 /*
 181  * fg_console is the current virtual console,
 182  * last_console is the last used one,
 183  * want_console is the console we want to switch to,
 184  * kmsg_redirect is the console for kernel messages,
 185  */
 186 int fg_console;
 187 int last_console;
 188 int want_console = -1;
 189 int kmsg_redirect;
 190
 191 /*
 192  * For each existing display, we have a pointer to console currently visible
 193  * on that display, allowing consoles other than fg_console to be refreshed
 194  * appropriately. Unless the low-level driver supplies its own display_fg
 195  * variable, we use this one for the "master display".
 196  */
 197 static struct vc_data *master_display_fg;
 198
 199 /*
 200  * Unfortunately, we need to delay tty echo when we're currently writing to the
 201  * console since the code is (and always was) not re-entrant, so we schedule
 202  * all flip requests to process context with schedule-task() and run it from
 203  * console_callback().
 204  */
 205
 206 /*
 207  * For the same reason, we defer scrollback to the console callback.
 208  */
 209 static int scrollback_delta;
 210
 211 /*
 212  * Hook so that the power management routines can (un)blank
 213  * the console on our behalf.
 214  */
 215 int (*console_blank_hook)(int);
 216
 217 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 218 static int blank_state;
 219 static int blank_timer_expired;
 220 enum {
 221         blank_off = 0,
 222         blank_normal_wait,
 223         blank_vesa_wait,
 224 };
 225
 226 /*
 227  * Notifier list for console events.
 228  */
 229 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 230
 231 int register_vt_notifier(struct notifier_block *nb)
 232 {
 233         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 234 }
 235 EXPORT_SYMBOL_GPL(register_vt_notifier);
 236
 237 int unregister_vt_notifier(struct notifier_block *nb)
 238 {
 239         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 240 }
 241 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 242
 243 static void notify_write(struct vc_data *vc, unsigned int unicode)
 244 {
 245         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 246         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 247 }
 248
 249 static void notify_update(struct vc_data *vc)
 250 {
 251         struct vt_notifier_param param = { .vc = vc };
 252         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 253 }
 254
 255 /*
 256  *      Low-Level Functions
 257  */
 258
 259 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 260
 261 #ifdef VT_BUF_VRAM_ONLY
 262 #define DO_UPDATE(vc)   0
 263 #else
 264 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 265 #endif
 266
 267 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 268 {
 269         unsigned short *p;
 270
 271         if (!viewed)
 272                 p = (unsigned short *)(vc->vc_origin + offset);
 273         else if (!vc->vc_sw->con_screen_pos)
 274                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 275         else
 276                 p = vc->vc_sw->con_screen_pos(vc, offset);
 277         return p;
 278 }
 279
 280 static inline void scrolldelta(int lines)
 281 {
 282         scrollback_delta += lines;
 283         schedule_console_callback();
 284 }
 285
 286 void schedule_console_callback(void)
 287 {
 288         schedule_work(&console_work);
 289 }
 290
 291 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 292 {
 293         unsigned short *d, *s;
 294
 295         if (t+nr >= b)
 296                 nr = b - t - 1;
 297         if (b > vc->vc_rows || t >= b || nr < 1)
 298                 return;
 299         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 300                 return;
 301         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 302         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 303         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 304         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_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, vc->vc_decscnm, 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                 struct pid *pgrp = NULL;
 913
 914                 memset(&ws, 0, sizeof(ws));
 915                 ws.ws_row = vc->vc_rows;
 916                 ws.ws_col = vc->vc_cols;
 917                 ws.ws_ypixel = vc->vc_scan_lines;
 918
 919                 spin_lock_irq(&vc->vc_tty->ctrl_lock);
 920                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col))
 921                         pgrp = get_pid(vc->vc_tty->pgrp);
 922                 spin_unlock_irq(&vc->vc_tty->ctrl_lock);
 923                 if (pgrp) {
 924                         kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
 925                         put_pid(pgrp);
 926                 }
 927                 *cws = ws;
 928         }
 929
 930         if (CON_IS_VISIBLE(vc))
 931                 update_screen(vc);
 932         return err;
 933 }
 934
 935 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 936 {
 937         int rc;
 938
 939         acquire_console_sem();
 940         rc = vc_resize(vc, cols, lines);
 941         release_console_sem();
 942         return rc;
 943 }
 944
 945 void vc_deallocate(unsigned int currcons)
 946 {
 947         WARN_CONSOLE_UNLOCKED();
 948
 949         if (vc_cons_allocated(currcons)) {
 950                 struct vc_data *vc = vc_cons[currcons].d;
 951                 struct vt_notifier_param param = { .vc = vc };
 952                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 953                 vc->vc_sw->con_deinit(vc);
 954                 put_pid(vc->vt_pid);
 955                 module_put(vc->vc_sw->owner);
 956                 if (vc->vc_kmalloced)
 957                         kfree(vc->vc_screenbuf);
 958                 if (currcons >= MIN_NR_CONSOLES)
 959                         kfree(vc);
 960                 vc_cons[currcons].d = NULL;
 961         }
 962 }
 963
 964 /*
 965  *      VT102 emulator
 966  */
 967
 968 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 969 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 970 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 971
 972 #define decarm          VC_REPEAT
 973 #define decckm          VC_CKMODE
 974 #define kbdapplic       VC_APPLIC
 975 #define lnm             VC_CRLF
 976
 977 /*
 978  * this is what the terminal answers to a ESC-Z or csi0c query.
 979  */
 980 #define VT100ID "\033[?1;2c"
 981 #define VT102ID "\033[?6c"
 982
 983 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
 984                                        8,12,10,14, 9,13,11,15 };
 985
 986 /* the default colour table, for VGA+ colour systems */
 987 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
 988     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
 989 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
 990     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
 991 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
 992     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
 993
 994 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
 995 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
 996 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
 997
 998 /*
 999  * gotoxy() must verify all boundaries, because the arguments
1000  * might also be negative. If the given position is out of
1001  * bounds, the cursor is placed at the nearest margin.
1002  */
1003 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1004 {
1005         int min_y, max_y;
1006
1007         if (new_x < 0)
1008                 vc->vc_x = 0;
1009         else {
1010                 if (new_x >= vc->vc_cols)
1011                         vc->vc_x = vc->vc_cols - 1;
1012                 else
1013                         vc->vc_x = new_x;
1014         }
1015
1016         if (vc->vc_decom) {
1017                 min_y = vc->vc_top;
1018                 max_y = vc->vc_bottom;
1019         } else {
1020                 min_y = 0;
1021                 max_y = vc->vc_rows;
1022         }
1023         if (new_y < min_y)
1024                 vc->vc_y = min_y;
1025         else if (new_y >= max_y)
1026                 vc->vc_y = max_y - 1;
1027         else
1028                 vc->vc_y = new_y;
1029         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1030         vc->vc_need_wrap = 0;
1031 }
1032
1033 /* for absolute user moves, when decom is set */
1034 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1035 {
1036         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1037 }
1038
1039 void scrollback(struct vc_data *vc, int lines)
1040 {
1041         if (!lines)
1042                 lines = vc->vc_rows / 2;
1043         scrolldelta(-lines);
1044 }
1045
1046 void scrollfront(struct vc_data *vc, int lines)
1047 {
1048         if (!lines)
1049                 lines = vc->vc_rows / 2;
1050         scrolldelta(lines);
1051 }
1052
1053 static void lf(struct vc_data *vc)
1054 {
1055         /* don't scroll if above bottom of scrolling region, or
1056          * if below scrolling region
1057          */
1058         if (vc->vc_y + 1 == vc->vc_bottom)
1059                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1060         else if (vc->vc_y < vc->vc_rows - 1) {
1061                 vc->vc_y++;
1062                 vc->vc_pos += vc->vc_size_row;
1063         }
1064         vc->vc_need_wrap = 0;
1065         notify_write(vc, '\n');
1066 }
1067
1068 static void ri(struct vc_data *vc)
1069 {
1070         /* don't scroll if below top of scrolling region, or
1071          * if above scrolling region
1072          */
1073         if (vc->vc_y == vc->vc_top)
1074                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1075         else if (vc->vc_y > 0) {
1076                 vc->vc_y--;
1077                 vc->vc_pos -= vc->vc_size_row;
1078         }
1079         vc->vc_need_wrap = 0;
1080 }
1081
1082 static inline void cr(struct vc_data *vc)
1083 {
1084         vc->vc_pos -= vc->vc_x << 1;
1085         vc->vc_need_wrap = vc->vc_x = 0;
1086         notify_write(vc, '\r');
1087 }
1088
1089 static inline void bs(struct vc_data *vc)
1090 {
1091         if (vc->vc_x) {
1092                 vc->vc_pos -= 2;
1093                 vc->vc_x--;
1094                 vc->vc_need_wrap = 0;
1095                 notify_write(vc, '\b');
1096         }
1097 }
1098
1099 static inline void del(struct vc_data *vc)
1100 {
1101         /* ignored */
1102 }
1103
1104 static void csi_J(struct vc_data *vc, int vpar)
1105 {
1106         unsigned int count;
1107         unsigned short * start;
1108
1109         switch (vpar) {
1110                 case 0: /* erase from cursor to end of display */
1111                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1112                         start = (unsigned short *)vc->vc_pos;
1113                         if (DO_UPDATE(vc)) {
1114                                 /* do in two stages */
1115                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1116                                               vc->vc_cols - vc->vc_x);
1117                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1118                                               vc->vc_rows - vc->vc_y - 1,
1119                                               vc->vc_cols);
1120                         }
1121                         break;
1122                 case 1: /* erase from start to cursor */
1123                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1124                         start = (unsigned short *)vc->vc_origin;
1125                         if (DO_UPDATE(vc)) {
1126                                 /* do in two stages */
1127                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1128                                               vc->vc_cols);
1129                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1130                                               vc->vc_x + 1);
1131                         }
1132                         break;
1133                 case 2: /* erase whole display */
1134                         count = vc->vc_cols * vc->vc_rows;
1135                         start = (unsigned short *)vc->vc_origin;
1136                         if (DO_UPDATE(vc))
1137                                 vc->vc_sw->con_clear(vc, 0, 0,
1138                                               vc->vc_rows,
1139                                               vc->vc_cols);
1140                         break;
1141                 default:
1142                         return;
1143         }
1144         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1145         vc->vc_need_wrap = 0;
1146 }
1147
1148 static void csi_K(struct vc_data *vc, int vpar)
1149 {
1150         unsigned int count;
1151         unsigned short * start;
1152
1153         switch (vpar) {
1154                 case 0: /* erase from cursor to end of line */
1155                         count = vc->vc_cols - vc->vc_x;
1156                         start = (unsigned short *)vc->vc_pos;
1157                         if (DO_UPDATE(vc))
1158                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1159                                                      vc->vc_cols - vc->vc_x);
1160                         break;
1161                 case 1: /* erase from start of line to cursor */
1162                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1163                         count = vc->vc_x + 1;
1164                         if (DO_UPDATE(vc))
1165                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1166                                                      vc->vc_x + 1);
1167                         break;
1168                 case 2: /* erase whole line */
1169                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1170                         count = vc->vc_cols;
1171                         if (DO_UPDATE(vc))
1172                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1173                                               vc->vc_cols);
1174                         break;
1175                 default:
1176                         return;
1177         }
1178         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1179         vc->vc_need_wrap = 0;
1180 }
1181
1182 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1183 {                                         /* not vt100? */
1184         int count;
1185
1186         if (!vpar)
1187                 vpar++;
1188         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1189
1190         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1191         if (DO_UPDATE(vc))
1192                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1193         vc->vc_need_wrap = 0;
1194 }
1195
1196 static void default_attr(struct vc_data *vc)
1197 {
1198         vc->vc_intensity = 1;
1199         vc->vc_italic = 0;
1200         vc->vc_underline = 0;
1201         vc->vc_reverse = 0;
1202         vc->vc_blink = 0;
1203         vc->vc_color = vc->vc_def_color;
1204 }
1205
1206 /* console_sem is held */
1207 static void csi_m(struct vc_data *vc)
1208 {
1209         int i;
1210
1211         for (i = 0; i <= vc->vc_npar; i++)
1212                 switch (vc->vc_par[i]) {
1213                         case 0: /* all attributes off */
1214                                 default_attr(vc);
1215                                 break;
1216                         case 1:
1217                                 vc->vc_intensity = 2;
1218                                 break;
1219                         case 2:
1220                                 vc->vc_intensity = 0;
1221                                 break;
1222                         case 3:
1223                                 vc->vc_italic = 1;
1224                                 break;
1225                         case 4:
1226                                 vc->vc_underline = 1;
1227                                 break;
1228                         case 5:
1229                                 vc->vc_blink = 1;
1230                                 break;
1231                         case 7:
1232                                 vc->vc_reverse = 1;
1233                                 break;
1234                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1235                                   * Select primary font, don't display
1236                                   * control chars if defined, don't set
1237                                   * bit 8 on output.
1238                                   */
1239                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1240                                                 ? vc->vc_G0_charset
1241                                                 : vc->vc_G1_charset, vc);
1242                                 vc->vc_disp_ctrl = 0;
1243                                 vc->vc_toggle_meta = 0;
1244                                 break;
1245                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1246                                   * Select first alternate font, lets
1247                                   * chars < 32 be displayed as ROM chars.
1248                                   */
1249                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1250                                 vc->vc_disp_ctrl = 1;
1251                                 vc->vc_toggle_meta = 0;
1252                                 break;
1253                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1254                                   * Select second alternate font, toggle
1255                                   * high bit before displaying as ROM char.
1256                                   */
1257                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1258                                 vc->vc_disp_ctrl = 1;
1259                                 vc->vc_toggle_meta = 1;
1260                                 break;
1261                         case 21:
1262                         case 22:
1263                                 vc->vc_intensity = 1;
1264                                 break;
1265                         case 23:
1266                                 vc->vc_italic = 0;
1267                                 break;
1268                         case 24:
1269                                 vc->vc_underline = 0;
1270                                 break;
1271                         case 25:
1272                                 vc->vc_blink = 0;
1273                                 break;
1274                         case 27:
1275                                 vc->vc_reverse = 0;
1276                                 break;
1277                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1278                                   * Enables underscore, white foreground
1279                                   * with white underscore (Linux - use
1280                                   * default foreground).
1281                                   */
1282                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1283                                 vc->vc_underline = 1;
1284                                 break;
1285                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1286                                   * Disable underline option.
1287                                   * Reset colour to default? It did this
1288                                   * before...
1289                                   */
1290                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1291                                 vc->vc_underline = 0;
1292                                 break;
1293                         case 49:
1294                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1295                                 break;
1296                         default:
1297                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1298                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1299                                                 | (vc->vc_color & 0xf0);
1300                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1301                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1302                                                 | (vc->vc_color & 0x0f);
1303                                 break;
1304                 }
1305         update_attr(vc);
1306 }
1307
1308 static void respond_string(const char *p, struct tty_struct *tty)
1309 {
1310         while (*p) {
1311                 tty_insert_flip_char(tty, *p, 0);
1312                 p++;
1313         }
1314         con_schedule_flip(tty);
1315 }
1316
1317 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1318 {
1319         char buf[40];
1320
1321         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1322         respond_string(buf, tty);
1323 }
1324
1325 static inline void status_report(struct tty_struct *tty)
1326 {
1327         respond_string("\033[0n", tty); /* Terminal ok */
1328 }
1329
1330 static inline void respond_ID(struct tty_struct * tty)
1331 {
1332         respond_string(VT102ID, tty);
1333 }
1334
1335 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1336 {
1337         char buf[8];
1338
1339         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1340                 (char)('!' + mry));
1341         respond_string(buf, tty);
1342 }
1343
1344 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1345 int mouse_reporting(void)
1346 {
1347         return vc_cons[fg_console].d->vc_report_mouse;
1348 }
1349
1350 /* console_sem is held */
1351 static void set_mode(struct vc_data *vc, int on_off)
1352 {
1353         int i;
1354
1355         for (i = 0; i <= vc->vc_npar; i++)
1356                 if (vc->vc_ques) {
1357                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1358                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1359                                 if (on_off)
1360                                         set_kbd(vc, decckm);
1361                                 else
1362                                         clr_kbd(vc, decckm);
1363                                 break;
1364                         case 3: /* 80/132 mode switch unimplemented */
1365                                 vc->vc_deccolm = on_off;
1366 #if 0
1367                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1368                                 /* this alone does not suffice; some user mode
1369                                    utility has to change the hardware regs */
1370 #endif
1371                                 break;
1372                         case 5:                 /* Inverted screen on/off */
1373                                 if (vc->vc_decscnm != on_off) {
1374                                         vc->vc_decscnm = on_off;
1375                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1376                                         update_attr(vc);
1377                                 }
1378                                 break;
1379                         case 6:                 /* Origin relative/absolute */
1380                                 vc->vc_decom = on_off;
1381                                 gotoxay(vc, 0, 0);
1382                                 break;
1383                         case 7:                 /* Autowrap on/off */
1384                                 vc->vc_decawm = on_off;
1385                                 break;
1386                         case 8:                 /* Autorepeat on/off */
1387                                 if (on_off)
1388                                         set_kbd(vc, decarm);
1389                                 else
1390                                         clr_kbd(vc, decarm);
1391                                 break;
1392                         case 9:
1393                                 vc->vc_report_mouse = on_off ? 1 : 0;
1394                                 break;
1395                         case 25:                /* Cursor on/off */
1396                                 vc->vc_deccm = on_off;
1397                                 break;
1398                         case 1000:
1399                                 vc->vc_report_mouse = on_off ? 2 : 0;
1400                                 break;
1401                         }
1402                 } else {
1403                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1404                         case 3:                 /* Monitor (display ctrls) */
1405                                 vc->vc_disp_ctrl = on_off;
1406                                 break;
1407                         case 4:                 /* Insert Mode on/off */
1408                                 vc->vc_decim = on_off;
1409                                 break;
1410                         case 20:                /* Lf, Enter == CrLf/Lf */
1411                                 if (on_off)
1412                                         set_kbd(vc, lnm);
1413                                 else
1414                                         clr_kbd(vc, lnm);
1415                                 break;
1416                         }
1417                 }
1418 }
1419
1420 /* console_sem is held */
1421 static void setterm_command(struct vc_data *vc)
1422 {
1423         switch(vc->vc_par[0]) {
1424                 case 1: /* set color for underline mode */
1425                         if (vc->vc_can_do_color &&
1426                                         vc->vc_par[1] < 16) {
1427                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1428                                 if (vc->vc_underline)
1429                                         update_attr(vc);
1430                         }
1431                         break;
1432                 case 2: /* set color for half intensity mode */
1433                         if (vc->vc_can_do_color &&
1434                                         vc->vc_par[1] < 16) {
1435                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1436                                 if (vc->vc_intensity == 0)
1437                                         update_attr(vc);
1438                         }
1439                         break;
1440                 case 8: /* store colors as defaults */
1441                         vc->vc_def_color = vc->vc_attr;
1442                         if (vc->vc_hi_font_mask == 0x100)
1443                                 vc->vc_def_color >>= 1;
1444                         default_attr(vc);
1445                         update_attr(vc);
1446                         break;
1447                 case 9: /* set blanking interval */
1448                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1449                         poke_blanked_console();
1450                         break;
1451                 case 10: /* set bell frequency in Hz */
1452                         if (vc->vc_npar >= 1)
1453                                 vc->vc_bell_pitch = vc->vc_par[1];
1454                         else
1455                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1456                         break;
1457                 case 11: /* set bell duration in msec */
1458                         if (vc->vc_npar >= 1)
1459                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1460                                         vc->vc_par[1] * HZ / 1000 : 0;
1461                         else
1462                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1463                         break;
1464                 case 12: /* bring specified console to the front */
1465                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1466                                 set_console(vc->vc_par[1] - 1);
1467                         break;
1468                 case 13: /* unblank the screen */
1469                         poke_blanked_console();
1470                         break;
1471                 case 14: /* set vesa powerdown interval */
1472                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1473                         break;
1474                 case 15: /* activate the previous console */
1475                         set_console(last_console);
1476                         break;
1477         }
1478 }
1479
1480 /* console_sem is held */
1481 static void csi_at(struct vc_data *vc, unsigned int nr)
1482 {
1483         if (nr > vc->vc_cols - vc->vc_x)
1484                 nr = vc->vc_cols - vc->vc_x;
1485         else if (!nr)
1486                 nr = 1;
1487         insert_char(vc, nr);
1488 }
1489
1490 /* console_sem is held */
1491 static void csi_L(struct vc_data *vc, unsigned int nr)
1492 {
1493         if (nr > vc->vc_rows - vc->vc_y)
1494                 nr = vc->vc_rows - vc->vc_y;
1495         else if (!nr)
1496                 nr = 1;
1497         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1498         vc->vc_need_wrap = 0;
1499 }
1500
1501 /* console_sem is held */
1502 static void csi_P(struct vc_data *vc, unsigned int nr)
1503 {
1504         if (nr > vc->vc_cols - vc->vc_x)
1505                 nr = vc->vc_cols - vc->vc_x;
1506         else if (!nr)
1507                 nr = 1;
1508         delete_char(vc, nr);
1509 }
1510
1511 /* console_sem is held */
1512 static void csi_M(struct vc_data *vc, unsigned int nr)
1513 {
1514         if (nr > vc->vc_rows - vc->vc_y)
1515                 nr = vc->vc_rows - vc->vc_y;
1516         else if (!nr)
1517                 nr=1;
1518         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1519         vc->vc_need_wrap = 0;
1520 }
1521
1522 /* console_sem is held (except via vc_init->reset_terminal */
1523 static void save_cur(struct vc_data *vc)
1524 {
1525         vc->vc_saved_x          = vc->vc_x;
1526         vc->vc_saved_y          = vc->vc_y;
1527         vc->vc_s_intensity      = vc->vc_intensity;
1528         vc->vc_s_italic         = vc->vc_italic;
1529         vc->vc_s_underline      = vc->vc_underline;
1530         vc->vc_s_blink          = vc->vc_blink;
1531         vc->vc_s_reverse        = vc->vc_reverse;
1532         vc->vc_s_charset        = vc->vc_charset;
1533         vc->vc_s_color          = vc->vc_color;
1534         vc->vc_saved_G0         = vc->vc_G0_charset;
1535         vc->vc_saved_G1         = vc->vc_G1_charset;
1536 }
1537
1538 /* console_sem is held */
1539 static void restore_cur(struct vc_data *vc)
1540 {
1541         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1542         vc->vc_intensity        = vc->vc_s_intensity;
1543         vc->vc_italic           = vc->vc_s_italic;
1544         vc->vc_underline        = vc->vc_s_underline;
1545         vc->vc_blink            = vc->vc_s_blink;
1546         vc->vc_reverse          = vc->vc_s_reverse;
1547         vc->vc_charset          = vc->vc_s_charset;
1548         vc->vc_color            = vc->vc_s_color;
1549         vc->vc_G0_charset       = vc->vc_saved_G0;
1550         vc->vc_G1_charset       = vc->vc_saved_G1;
1551         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1552         update_attr(vc);
1553         vc->vc_need_wrap = 0;
1554 }
1555
1556 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1557         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1558         ESpalette };
1559
1560 /* console_sem is held (except via vc_init()) */
1561 static void reset_terminal(struct vc_data *vc, int do_clear)
1562 {
1563         vc->vc_top              = 0;
1564         vc->vc_bottom           = vc->vc_rows;
1565         vc->vc_state            = ESnormal;
1566         vc->vc_ques             = 0;
1567         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1568         vc->vc_G0_charset       = LAT1_MAP;
1569         vc->vc_G1_charset       = GRAF_MAP;
1570         vc->vc_charset          = 0;
1571         vc->vc_need_wrap        = 0;
1572         vc->vc_report_mouse     = 0;
1573         vc->vc_utf              = default_utf8;
1574         vc->vc_utf_count        = 0;
1575
1576         vc->vc_disp_ctrl        = 0;
1577         vc->vc_toggle_meta      = 0;
1578
1579         vc->vc_decscnm          = 0;
1580         vc->vc_decom            = 0;
1581         vc->vc_decawm           = 1;
1582         vc->vc_deccm            = 1;
1583         vc->vc_decim            = 0;
1584
1585         set_kbd(vc, decarm);
1586         clr_kbd(vc, decckm);
1587         clr_kbd(vc, kbdapplic);
1588         clr_kbd(vc, lnm);
1589         kbd_table[vc->vc_num].lockstate = 0;
1590         kbd_table[vc->vc_num].slockstate = 0;
1591         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1592         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1593         /* do not do set_leds here because this causes an endless tasklet loop
1594            when the keyboard hasn't been initialized yet */
1595
1596         vc->vc_cursor_type = CUR_DEFAULT;
1597         vc->vc_complement_mask = vc->vc_s_complement_mask;
1598
1599         default_attr(vc);
1600         update_attr(vc);
1601
1602         vc->vc_tab_stop[0]      = 0x01010100;
1603         vc->vc_tab_stop[1]      =
1604         vc->vc_tab_stop[2]      =
1605         vc->vc_tab_stop[3]      =
1606         vc->vc_tab_stop[4]      = 0x01010101;
1607
1608         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1609         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1610
1611         gotoxy(vc, 0, 0);
1612         save_cur(vc);
1613         if (do_clear)
1614             csi_J(vc, 2);
1615 }
1616
1617 /* console_sem is held */
1618 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1619 {
1620         /*
1621          *  Control characters can be used in the _middle_
1622          *  of an escape sequence.
1623          */
1624         switch (c) {
1625         case 0:
1626                 return;
1627         case 7:
1628                 if (vc->vc_bell_duration)
1629                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1630                 return;
1631         case 8:
1632                 bs(vc);
1633                 return;
1634         case 9:
1635                 vc->vc_pos -= (vc->vc_x << 1);
1636                 while (vc->vc_x < vc->vc_cols - 1) {
1637                         vc->vc_x++;
1638                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1639                                 break;
1640                 }
1641                 vc->vc_pos += (vc->vc_x << 1);
1642                 notify_write(vc, '\t');
1643                 return;
1644         case 10: case 11: case 12:
1645                 lf(vc);
1646                 if (!is_kbd(vc, lnm))
1647                         return;
1648         case 13:
1649                 cr(vc);
1650                 return;
1651         case 14:
1652                 vc->vc_charset = 1;
1653                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1654                 vc->vc_disp_ctrl = 1;
1655                 return;
1656         case 15:
1657                 vc->vc_charset = 0;
1658                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1659                 vc->vc_disp_ctrl = 0;
1660                 return;
1661         case 24: case 26:
1662                 vc->vc_state = ESnormal;
1663                 return;
1664         case 27:
1665                 vc->vc_state = ESesc;
1666                 return;
1667         case 127:
1668                 del(vc);
1669                 return;
1670         case 128+27:
1671                 vc->vc_state = ESsquare;
1672                 return;
1673         }
1674         switch(vc->vc_state) {
1675         case ESesc:
1676                 vc->vc_state = ESnormal;
1677                 switch (c) {
1678                 case '[':
1679                         vc->vc_state = ESsquare;
1680                         return;
1681                 case ']':
1682                         vc->vc_state = ESnonstd;
1683                         return;
1684                 case '%':
1685                         vc->vc_state = ESpercent;
1686                         return;
1687                 case 'E':
1688                         cr(vc);
1689                         lf(vc);
1690                         return;
1691                 case 'M':
1692                         ri(vc);
1693                         return;
1694                 case 'D':
1695                         lf(vc);
1696                         return;
1697                 case 'H':
1698                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1699                         return;
1700                 case 'Z':
1701                         respond_ID(tty);
1702                         return;
1703                 case '7':
1704                         save_cur(vc);
1705                         return;
1706                 case '8':
1707                         restore_cur(vc);
1708                         return;
1709                 case '(':
1710                         vc->vc_state = ESsetG0;
1711                         return;
1712                 case ')':
1713                         vc->vc_state = ESsetG1;
1714                         return;
1715                 case '#':
1716                         vc->vc_state = EShash;
1717                         return;
1718                 case 'c':
1719                         reset_terminal(vc, 1);
1720                         return;
1721                 case '>':  /* Numeric keypad */
1722                         clr_kbd(vc, kbdapplic);
1723                         return;
1724                 case '=':  /* Appl. keypad */
1725                         set_kbd(vc, kbdapplic);
1726                         return;
1727                 }
1728                 return;
1729         case ESnonstd:
1730                 if (c=='P') {   /* palette escape sequence */
1731                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1732                                 vc->vc_par[vc->vc_npar] = 0;
1733                         vc->vc_npar = 0;
1734                         vc->vc_state = ESpalette;
1735                         return;
1736                 } else if (c=='R') {   /* reset palette */
1737                         reset_palette(vc);
1738                         vc->vc_state = ESnormal;
1739                 } else
1740                         vc->vc_state = ESnormal;
1741                 return;
1742         case ESpalette:
1743                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1744                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1745                         if (vc->vc_npar == 7) {
1746                                 int i = vc->vc_par[0] * 3, j = 1;
1747                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1748                                 vc->vc_palette[i++] += vc->vc_par[j++];
1749                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1750                                 vc->vc_palette[i++] += vc->vc_par[j++];
1751                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1752                                 vc->vc_palette[i] += vc->vc_par[j];
1753                                 set_palette(vc);
1754                                 vc->vc_state = ESnormal;
1755                         }
1756                 } else
1757                         vc->vc_state = ESnormal;
1758                 return;
1759         case ESsquare:
1760                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1761                         vc->vc_par[vc->vc_npar] = 0;
1762                 vc->vc_npar = 0;
1763                 vc->vc_state = ESgetpars;
1764                 if (c == '[') { /* Function key */
1765                         vc->vc_state=ESfunckey;
1766                         return;
1767                 }
1768                 vc->vc_ques = (c == '?');
1769                 if (vc->vc_ques)
1770                         return;
1771         case ESgetpars:
1772                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1773                         vc->vc_npar++;
1774                         return;
1775                 } else if (c>='0' && c<='9') {
1776                         vc->vc_par[vc->vc_npar] *= 10;
1777                         vc->vc_par[vc->vc_npar] += c - '0';
1778                         return;
1779                 } else
1780                         vc->vc_state = ESgotpars;
1781         case ESgotpars:
1782                 vc->vc_state = ESnormal;
1783                 switch(c) {
1784                 case 'h':
1785                         set_mode(vc, 1);
1786                         return;
1787                 case 'l':
1788                         set_mode(vc, 0);
1789                         return;
1790                 case 'c':
1791                         if (vc->vc_ques) {
1792                                 if (vc->vc_par[0])
1793                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1794                                 else
1795                                         vc->vc_cursor_type = CUR_DEFAULT;
1796                                 return;
1797                         }
1798                         break;
1799                 case 'm':
1800                         if (vc->vc_ques) {
1801                                 clear_selection();
1802                                 if (vc->vc_par[0])
1803                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1804                                 else
1805                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1806                                 return;
1807                         }
1808                         break;
1809                 case 'n':
1810                         if (!vc->vc_ques) {
1811                                 if (vc->vc_par[0] == 5)
1812                                         status_report(tty);
1813                                 else if (vc->vc_par[0] == 6)
1814                                         cursor_report(vc, tty);
1815                         }
1816                         return;
1817                 }
1818                 if (vc->vc_ques) {
1819                         vc->vc_ques = 0;
1820                         return;
1821                 }
1822                 switch(c) {
1823                 case 'G': case '`':
1824                         if (vc->vc_par[0])
1825                                 vc->vc_par[0]--;
1826                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1827                         return;
1828                 case 'A':
1829                         if (!vc->vc_par[0])
1830                                 vc->vc_par[0]++;
1831                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1832                         return;
1833                 case 'B': case 'e':
1834                         if (!vc->vc_par[0])
1835                                 vc->vc_par[0]++;
1836                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1837                         return;
1838                 case 'C': case 'a':
1839                         if (!vc->vc_par[0])
1840                                 vc->vc_par[0]++;
1841                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1842                         return;
1843                 case 'D':
1844                         if (!vc->vc_par[0])
1845                                 vc->vc_par[0]++;
1846                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1847                         return;
1848                 case 'E':
1849                         if (!vc->vc_par[0])
1850                                 vc->vc_par[0]++;
1851                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1852                         return;
1853                 case 'F':
1854                         if (!vc->vc_par[0])
1855                                 vc->vc_par[0]++;
1856                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1857                         return;
1858                 case 'd':
1859                         if (vc->vc_par[0])
1860                                 vc->vc_par[0]--;
1861                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1862                         return;
1863                 case 'H': case 'f':
1864                         if (vc->vc_par[0])
1865                                 vc->vc_par[0]--;
1866                         if (vc->vc_par[1])
1867                                 vc->vc_par[1]--;
1868                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1869                         return;
1870                 case 'J':
1871                         csi_J(vc, vc->vc_par[0]);
1872                         return;
1873                 case 'K':
1874                         csi_K(vc, vc->vc_par[0]);
1875                         return;
1876                 case 'L':
1877                         csi_L(vc, vc->vc_par[0]);
1878                         return;
1879                 case 'M':
1880                         csi_M(vc, vc->vc_par[0]);
1881                         return;
1882                 case 'P':
1883                         csi_P(vc, vc->vc_par[0]);
1884                         return;
1885                 case 'c':
1886                         if (!vc->vc_par[0])
1887                                 respond_ID(tty);
1888                         return;
1889                 case 'g':
1890                         if (!vc->vc_par[0])
1891                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1892                         else if (vc->vc_par[0] == 3) {
1893                                 vc->vc_tab_stop[0] =
1894                                         vc->vc_tab_stop[1] =
1895                                         vc->vc_tab_stop[2] =
1896                                         vc->vc_tab_stop[3] =
1897                                         vc->vc_tab_stop[4] = 0;
1898                         }
1899                         return;
1900                 case 'm':
1901                         csi_m(vc);
1902                         return;
1903                 case 'q': /* DECLL - but only 3 leds */
1904                         /* map 0,1,2,3 to 0,1,2,4 */
1905                         if (vc->vc_par[0] < 4)
1906                                 setledstate(kbd_table + vc->vc_num,
1907                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1908                         return;
1909                 case 'r':
1910                         if (!vc->vc_par[0])
1911                                 vc->vc_par[0]++;
1912                         if (!vc->vc_par[1])
1913                                 vc->vc_par[1] = vc->vc_rows;
1914                         /* Minimum allowed region is 2 lines */
1915                         if (vc->vc_par[0] < vc->vc_par[1] &&
1916                             vc->vc_par[1] <= vc->vc_rows) {
1917                                 vc->vc_top = vc->vc_par[0] - 1;
1918                                 vc->vc_bottom = vc->vc_par[1];
1919                                 gotoxay(vc, 0, 0);
1920                         }
1921                         return;
1922                 case 's':
1923                         save_cur(vc);
1924                         return;
1925                 case 'u':
1926                         restore_cur(vc);
1927                         return;
1928                 case 'X':
1929                         csi_X(vc, vc->vc_par[0]);
1930                         return;
1931                 case '@':
1932                         csi_at(vc, vc->vc_par[0]);
1933                         return;
1934                 case ']': /* setterm functions */
1935                         setterm_command(vc);
1936                         return;
1937                 }
1938                 return;
1939         case ESpercent:
1940                 vc->vc_state = ESnormal;
1941                 switch (c) {
1942                 case '@':  /* defined in ISO 2022 */
1943                         vc->vc_utf = 0;
1944                         return;
1945                 case 'G':  /* prelim official escape code */
1946                 case '8':  /* retained for compatibility */
1947                         vc->vc_utf = 1;
1948                         return;
1949                 }
1950                 return;
1951         case ESfunckey:
1952                 vc->vc_state = ESnormal;
1953                 return;
1954         case EShash:
1955                 vc->vc_state = ESnormal;
1956                 if (c == '8') {
1957                         /* DEC screen alignment test. kludge :-) */
1958                         vc->vc_video_erase_char =
1959                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1960                         csi_J(vc, 2);
1961                         vc->vc_video_erase_char =
1962                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1963                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1964                 }
1965                 return;
1966         case ESsetG0:
1967                 if (c == '0')
1968                         vc->vc_G0_charset = GRAF_MAP;
1969                 else if (c == 'B')
1970                         vc->vc_G0_charset = LAT1_MAP;
1971                 else if (c == 'U')
1972                         vc->vc_G0_charset = IBMPC_MAP;
1973                 else if (c == 'K')
1974                         vc->vc_G0_charset = USER_MAP;
1975                 if (vc->vc_charset == 0)
1976                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1977                 vc->vc_state = ESnormal;
1978                 return;
1979         case ESsetG1:
1980                 if (c == '0')
1981                         vc->vc_G1_charset = GRAF_MAP;
1982                 else if (c == 'B')
1983                         vc->vc_G1_charset = LAT1_MAP;
1984                 else if (c == 'U')
1985                         vc->vc_G1_charset = IBMPC_MAP;
1986                 else if (c == 'K')
1987                         vc->vc_G1_charset = USER_MAP;
1988                 if (vc->vc_charset == 1)
1989                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1990                 vc->vc_state = ESnormal;
1991                 return;
1992         default:
1993                 vc->vc_state = ESnormal;
1994         }
1995 }
1996
1997 /* This is a temporary buffer used to prepare a tty console write
1998  * so that we can easily avoid touching user space while holding the
1999  * console spinlock.  It is allocated in con_init and is shared by
2000  * this code and the vc_screen read/write tty calls.
2001  *
2002  * We have to allocate this statically in the kernel data section
2003  * since console_init (and thus con_init) are called before any
2004  * kernel memory allocation is available.
2005  */
2006 char con_buf[CON_BUF_SIZE];
2007 DEFINE_MUTEX(con_buf_mtx);
2008
2009 /* is_double_width() is based on the wcwidth() implementation by
2010  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2011  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2012  */
2013 struct interval {
2014         uint32_t first;
2015         uint32_t last;
2016 };
2017
2018 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2019 {
2020         int min = 0;
2021         int mid;
2022
2023         if (ucs < table[0].first || ucs > table[max].last)
2024                 return 0;
2025         while (max >= min) {
2026                 mid = (min + max) / 2;
2027                 if (ucs > table[mid].last)
2028                         min = mid + 1;
2029                 else if (ucs < table[mid].first)
2030                         max = mid - 1;
2031                 else
2032                         return 1;
2033         }
2034         return 0;
2035 }
2036
2037 static int is_double_width(uint32_t ucs)
2038 {
2039         static const struct interval double_width[] = {
2040                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2041                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2042                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2043                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2044         };
2045         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2046 }
2047
2048 /* acquires console_sem */
2049 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2050 {
2051 #ifdef VT_BUF_VRAM_ONLY
2052 #define FLUSH do { } while(0);
2053 #else
2054 #define FLUSH if (draw_x >= 0) { \
2055         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2056         draw_x = -1; \
2057         }
2058 #endif
2059
2060         int c, tc, ok, n = 0, draw_x = -1;
2061         unsigned int currcons;
2062         unsigned long draw_from = 0, draw_to = 0;
2063         struct vc_data *vc;
2064         unsigned char vc_attr;
2065         struct vt_notifier_param param;
2066         uint8_t rescan;
2067         uint8_t inverse;
2068         uint8_t width;
2069         u16 himask, charmask;
2070         const unsigned char *orig_buf = NULL;
2071         int orig_count;
2072
2073         if (in_interrupt())
2074                 return count;
2075
2076         might_sleep();
2077
2078         acquire_console_sem();
2079         vc = tty->driver_data;
2080         if (vc == NULL) {
2081                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2082                 release_console_sem();
2083                 return 0;
2084         }
2085
2086         currcons = vc->vc_num;
2087         if (!vc_cons_allocated(currcons)) {
2088             /* could this happen? */
2089             static int error = 0;
2090             if (!error) {
2091                 error = 1;
2092                 printk("con_write: tty %d not allocated\n", currcons+1);
2093             }
2094             release_console_sem();
2095             return 0;
2096         }
2097         release_console_sem();
2098
2099         orig_buf = buf;
2100         orig_count = count;
2101
2102         /* At this point 'buf' is guaranteed to be a kernel buffer
2103          * and therefore no access to userspace (and therefore sleeping)
2104          * will be needed.  The con_buf_mtx serializes all tty based
2105          * console rendering and vcs write/read operations.  We hold
2106          * the console spinlock during the entire write.
2107          */
2108
2109         acquire_console_sem();
2110
2111         vc = tty->driver_data;
2112         if (vc == NULL) {
2113                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2114                 release_console_sem();
2115                 goto out;
2116         }
2117
2118         himask = vc->vc_hi_font_mask;
2119         charmask = himask ? 0x1ff : 0xff;
2120
2121         /* undraw cursor first */
2122         if (IS_FG(vc))
2123                 hide_cursor(vc);
2124
2125         param.vc = vc;
2126
2127         while (!tty->stopped && count) {
2128                 int orig = *buf;
2129                 c = orig;
2130                 buf++;
2131                 n++;
2132                 count--;
2133                 rescan = 0;
2134                 inverse = 0;
2135                 width = 1;
2136
2137                 /* Do no translation at all in control states */
2138                 if (vc->vc_state != ESnormal) {
2139                         tc = c;
2140                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2141                     /* Combine UTF-8 into Unicode in vc_utf_char.
2142                      * vc_utf_count is the number of continuation bytes still
2143                      * expected to arrive.
2144                      * vc_npar is the number of continuation bytes arrived so
2145                      * far
2146                      */
2147 rescan_last_byte:
2148                     if ((c & 0xc0) == 0x80) {
2149                         /* Continuation byte received */
2150                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2151                         if (vc->vc_utf_count) {
2152                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2153                             vc->vc_npar++;
2154                             if (--vc->vc_utf_count) {
2155                                 /* Still need some bytes */
2156                                 continue;
2157                             }
2158                             /* Got a whole character */
2159                             c = vc->vc_utf_char;
2160                             /* Reject overlong sequences */
2161                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2162                                         c > utf8_length_changes[vc->vc_npar])
2163                                 c = 0xfffd;
2164                         } else {
2165                             /* Unexpected continuation byte */
2166                             vc->vc_utf_count = 0;
2167                             c = 0xfffd;
2168                         }
2169                     } else {
2170                         /* Single ASCII byte or first byte of a sequence received */
2171                         if (vc->vc_utf_count) {
2172                             /* Continuation byte expected */
2173                             rescan = 1;
2174                             vc->vc_utf_count = 0;
2175                             c = 0xfffd;
2176                         } else if (c > 0x7f) {
2177                             /* First byte of a multibyte sequence received */
2178                             vc->vc_npar = 0;
2179                             if ((c & 0xe0) == 0xc0) {
2180                                 vc->vc_utf_count = 1;
2181                                 vc->vc_utf_char = (c & 0x1f);
2182                             } else if ((c & 0xf0) == 0xe0) {
2183                                 vc->vc_utf_count = 2;
2184                                 vc->vc_utf_char = (c & 0x0f);
2185                             } else if ((c & 0xf8) == 0xf0) {
2186                                 vc->vc_utf_count = 3;
2187                                 vc->vc_utf_char = (c & 0x07);
2188                             } else if ((c & 0xfc) == 0xf8) {
2189                                 vc->vc_utf_count = 4;
2190                                 vc->vc_utf_char = (c & 0x03);
2191                             } else if ((c & 0xfe) == 0xfc) {
2192                                 vc->vc_utf_count = 5;
2193                                 vc->vc_utf_char = (c & 0x01);
2194                             } else {
2195                                 /* 254 and 255 are invalid */
2196                                 c = 0xfffd;
2197                             }
2198                             if (vc->vc_utf_count) {
2199                                 /* Still need some bytes */
2200                                 continue;
2201                             }
2202                         }
2203                         /* Nothing to do if an ASCII byte was received */
2204                     }
2205                     /* End of UTF-8 decoding. */
2206                     /* c is the received character, or U+FFFD for invalid sequences. */
2207                     /* Replace invalid Unicode code points with U+FFFD too */
2208                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2209                         c = 0xfffd;
2210                     tc = c;
2211                 } else {        /* no utf or alternate charset mode */
2212                     tc = vc_translate(vc, c);
2213                 }
2214
2215                 param.c = tc;
2216                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2217                                         &param) == NOTIFY_STOP)
2218                         continue;
2219
2220                 /* If the original code was a control character we
2221                  * only allow a glyph to be displayed if the code is
2222                  * not normally used (such as for cursor movement) or
2223                  * if the disp_ctrl mode has been explicitly enabled.
2224                  * Certain characters (as given by the CTRL_ALWAYS
2225                  * bitmap) are always displayed as control characters,
2226                  * as the console would be pretty useless without
2227                  * them; to display an arbitrary font position use the
2228                  * direct-to-font zone in UTF-8 mode.
2229                  */
2230                 ok = tc && (c >= 32 ||
2231                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2232                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2233                         && (c != 127 || vc->vc_disp_ctrl)
2234                         && (c != 128+27);
2235
2236                 if (vc->vc_state == ESnormal && ok) {
2237                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2238                                 if (is_double_width(c))
2239                                         width = 2;
2240                         }
2241                         /* Now try to find out how to display it */
2242                         tc = conv_uni_to_pc(vc, tc);
2243                         if (tc & ~charmask) {
2244                                 if (tc == -1 || tc == -2) {
2245                                     continue; /* nothing to display */
2246                                 }
2247                                 /* Glyph not found */
2248                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2249                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2250                                        This would make absolutely no sense with Unicode in mind,
2251                                        but do this for ASCII characters since a font may lack
2252                                        Unicode mapping info and we don't want to end up with
2253                                        having question marks only. */
2254                                     tc = c;
2255                                 } else {
2256                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2257                                     tc = conv_uni_to_pc(vc, 0xfffd);
2258                                     if (tc < 0) {
2259                                         inverse = 1;
2260                                         tc = conv_uni_to_pc(vc, '?');
2261                                         if (tc < 0) tc = '?';
2262                                     }
2263                                 }
2264                         }
2265
2266                         if (!inverse) {
2267                                 vc_attr = vc->vc_attr;
2268                         } else {
2269                                 /* invert vc_attr */
2270                                 if (!vc->vc_can_do_color) {
2271                                         vc_attr = (vc->vc_attr) ^ 0x08;
2272                                 } else if (vc->vc_hi_font_mask == 0x100) {
2273                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2274                                 } else {
2275                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2276                                 }
2277                                 FLUSH
2278                         }
2279
2280                         while (1) {
2281                                 if (vc->vc_need_wrap || vc->vc_decim)
2282                                         FLUSH
2283                                 if (vc->vc_need_wrap) {
2284                                         cr(vc);
2285                                         lf(vc);
2286                                 }
2287                                 if (vc->vc_decim)
2288                                         insert_char(vc, 1);
2289                                 scr_writew(himask ?
2290                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2291                                              (vc_attr << 8) + tc,
2292                                            (u16 *) vc->vc_pos);
2293                                 if (DO_UPDATE(vc) && draw_x < 0) {
2294                                         draw_x = vc->vc_x;
2295                                         draw_from = vc->vc_pos;
2296                                 }
2297                                 if (vc->vc_x == vc->vc_cols - 1) {
2298                                         vc->vc_need_wrap = vc->vc_decawm;
2299                                         draw_to = vc->vc_pos + 2;
2300                                 } else {
2301                                         vc->vc_x++;
2302                                         draw_to = (vc->vc_pos += 2);
2303                                 }
2304
2305                                 if (!--width) break;
2306
2307                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2308                                 if (tc < 0) tc = ' ';
2309                         }
2310                         notify_write(vc, c);
2311
2312                         if (inverse) {
2313                                 FLUSH
2314                         }
2315
2316                         if (rescan) {
2317                                 rescan = 0;
2318                                 inverse = 0;
2319                                 width = 1;
2320                                 c = orig;
2321                                 goto rescan_last_byte;
2322                         }
2323                         continue;
2324                 }
2325                 FLUSH
2326                 do_con_trol(tty, vc, orig);
2327         }
2328         FLUSH
2329         console_conditional_schedule();
2330         release_console_sem();
2331
2332 out:
2333         notify_update(vc);
2334         return n;
2335 #undef FLUSH
2336 }
2337
2338 /*
2339  * This is the console switching callback.
2340  *
2341  * Doing console switching in a process context allows
2342  * us to do the switches asynchronously (needed when we want
2343  * to switch due to a keyboard interrupt).  Synchronization
2344  * with other console code and prevention of re-entrancy is
2345  * ensured with console_sem.
2346  */
2347 static void console_callback(struct work_struct *ignored)
2348 {
2349         acquire_console_sem();
2350
2351         if (want_console >= 0) {
2352                 if (want_console != fg_console &&
2353                     vc_cons_allocated(want_console)) {
2354                         hide_cursor(vc_cons[fg_console].d);
2355                         change_console(vc_cons[want_console].d);
2356                         /* we only changed when the console had already
2357                            been allocated - a new console is not created
2358                            in an interrupt routine */
2359                 }
2360                 want_console = -1;
2361         }
2362         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2363                 do_poke_blanked_console = 0;
2364                 poke_blanked_console();
2365         }
2366         if (scrollback_delta) {
2367                 struct vc_data *vc = vc_cons[fg_console].d;
2368                 clear_selection();
2369                 if (vc->vc_mode == KD_TEXT)
2370                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2371                 scrollback_delta = 0;
2372         }
2373         if (blank_timer_expired) {
2374                 do_blank_screen(0);
2375                 blank_timer_expired = 0;
2376         }
2377         notify_update(vc_cons[fg_console].d);
2378
2379         release_console_sem();
2380 }
2381
2382 int set_console(int nr)
2383 {
2384         struct vc_data *vc = vc_cons[fg_console].d;
2385
2386         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2387                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2388
2389                 /*
2390                  * Console switch will fail in console_callback() or
2391                  * change_console() so there is no point scheduling
2392                  * the callback
2393                  *
2394                  * Existing set_console() users don't check the return
2395                  * value so this shouldn't break anything
2396                  */
2397                 return -EINVAL;
2398         }
2399
2400         want_console = nr;
2401         schedule_console_callback();
2402
2403         return 0;
2404 }
2405
2406 struct tty_driver *console_driver;
2407
2408 #ifdef CONFIG_VT_CONSOLE
2409
2410 /*
2411  *      Console on virtual terminal
2412  *
2413  * The console must be locked when we get here.
2414  */
2415
2416 static void vt_console_print(struct console *co, const char *b, unsigned count)
2417 {
2418         struct vc_data *vc = vc_cons[fg_console].d;
2419         unsigned char c;
2420         static DEFINE_SPINLOCK(printing_lock);
2421         const ushort *start;
2422         ushort cnt = 0;
2423         ushort myx;
2424
2425         /* console busy or not yet initialized */
2426         if (!printable)
2427                 return;
2428         if (!spin_trylock(&printing_lock))
2429                 return;
2430
2431         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2432                 vc = vc_cons[kmsg_redirect - 1].d;
2433
2434         /* read `x' only after setting currcons properly (otherwise
2435            the `x' macro will read the x of the foreground console). */
2436         myx = vc->vc_x;
2437
2438         if (!vc_cons_allocated(fg_console)) {
2439                 /* impossible */
2440                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2441                 goto quit;
2442         }
2443
2444         if (vc->vc_mode != KD_TEXT)
2445                 goto quit;
2446
2447         /* undraw cursor first */
2448         if (IS_FG(vc))
2449                 hide_cursor(vc);
2450
2451         start = (ushort *)vc->vc_pos;
2452
2453         /* Contrived structure to try to emulate original need_wrap behaviour
2454          * Problems caused when we have need_wrap set on '\n' character */
2455         while (count--) {
2456                 c = *b++;
2457                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2458                         if (cnt > 0) {
2459                                 if (CON_IS_VISIBLE(vc))
2460                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2461                                 vc->vc_x += cnt;
2462                                 if (vc->vc_need_wrap)
2463                                         vc->vc_x--;
2464                                 cnt = 0;
2465                         }
2466                         if (c == 8) {           /* backspace */
2467                                 bs(vc);
2468                                 start = (ushort *)vc->vc_pos;
2469                                 myx = vc->vc_x;
2470                                 continue;
2471                         }
2472                         if (c != 13)
2473                                 lf(vc);
2474                         cr(vc);
2475                         start = (ushort *)vc->vc_pos;
2476                         myx = vc->vc_x;
2477                         if (c == 10 || c == 13)
2478                                 continue;
2479                 }
2480                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2481                 notify_write(vc, c);
2482                 cnt++;
2483                 if (myx == vc->vc_cols - 1) {
2484                         vc->vc_need_wrap = 1;
2485                         continue;
2486                 }
2487                 vc->vc_pos += 2;
2488                 myx++;
2489         }
2490         if (cnt > 0) {
2491                 if (CON_IS_VISIBLE(vc))
2492                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2493                 vc->vc_x += cnt;
2494                 if (vc->vc_x == vc->vc_cols) {
2495                         vc->vc_x--;
2496                         vc->vc_need_wrap = 1;
2497                 }
2498         }
2499         set_cursor(vc);
2500         notify_update(vc);
2501
2502 quit:
2503         spin_unlock(&printing_lock);
2504 }
2505
2506 static struct tty_driver *vt_console_device(struct console *c, int *index)
2507 {
2508         *index = c->index ? c->index-1 : fg_console;
2509         return console_driver;
2510 }
2511
2512 static struct console vt_console_driver = {
2513         .name           = "tty",
2514         .write          = vt_console_print,
2515         .device         = vt_console_device,
2516         .unblank        = unblank_screen,
2517         .flags          = CON_PRINTBUFFER,
2518         .index          = -1,
2519 };
2520 #endif
2521
2522 /*
2523  *      Handling of Linux-specific VC ioctls
2524  */
2525
2526 /*
2527  * Generally a bit racy with respect to console_sem().
2528  *
2529  * There are some functions which don't need it.
2530  *
2531  * There are some functions which can sleep for arbitrary periods
2532  * (paste_selection) but we don't need the lock there anyway.
2533  *
2534  * set_selection has locking, and definitely needs it
2535  */
2536
2537 int tioclinux(struct tty_struct *tty, unsigned long arg)
2538 {
2539         char type, data;
2540         char __user *p = (char __user *)arg;
2541         int lines;
2542         int ret;
2543
2544         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2545                 return -EINVAL;
2546         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2547                 return -EPERM;
2548         if (get_user(type, p))
2549                 return -EFAULT;
2550         ret = 0;
2551
2552         lock_kernel();
2553
2554         switch (type)
2555         {
2556                 case TIOCL_SETSEL:
2557                         acquire_console_sem();
2558                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2559                         release_console_sem();
2560                         break;
2561                 case TIOCL_PASTESEL:
2562                         ret = paste_selection(tty);
2563                         break;
2564                 case TIOCL_UNBLANKSCREEN:
2565                         acquire_console_sem();
2566                         unblank_screen();
2567                         release_console_sem();
2568                         break;
2569                 case TIOCL_SELLOADLUT:
2570                         ret = sel_loadlut(p);
2571                         break;
2572                 case TIOCL_GETSHIFTSTATE:
2573
2574         /*
2575          * Make it possible to react to Shift+Mousebutton.
2576          * Note that 'shift_state' is an undocumented
2577          * kernel-internal variable; programs not closely
2578          * related to the kernel should not use this.
2579          */
2580                         data = shift_state;
2581                         ret = __put_user(data, p);
2582                         break;
2583                 case TIOCL_GETMOUSEREPORTING:
2584                         data = mouse_reporting();
2585                         ret = __put_user(data, p);
2586                         break;
2587                 case TIOCL_SETVESABLANK:
2588                         ret = set_vesa_blanking(p);
2589                         break;
2590                 case TIOCL_GETKMSGREDIRECT:
2591                         data = kmsg_redirect;
2592                         ret = __put_user(data, p);
2593                         break;
2594                 case TIOCL_SETKMSGREDIRECT:
2595                         if (!capable(CAP_SYS_ADMIN)) {
2596                                 ret = -EPERM;
2597                         } else {
2598                                 if (get_user(data, p+1))
2599                                         ret = -EFAULT;
2600                                 else
2601                                         kmsg_redirect = data;
2602                         }
2603                         break;
2604                 case TIOCL_GETFGCONSOLE:
2605                         ret = fg_console;
2606                         break;
2607                 case TIOCL_SCROLLCONSOLE:
2608                         if (get_user(lines, (s32 __user *)(p+4))) {
2609                                 ret = -EFAULT;
2610                         } else {
2611                                 scrollfront(vc_cons[fg_console].d, lines);
2612                                 ret = 0;
2613                         }
2614                         break;
2615                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2616                         acquire_console_sem();
2617                         ignore_poke = 1;
2618                         do_blank_screen(0);
2619                         release_console_sem();
2620                         break;
2621                 case TIOCL_BLANKEDSCREEN:
2622                         ret = console_blanked;
2623                         break;
2624                 default:
2625                         ret = -EINVAL;
2626                         break;
2627         }
2628         unlock_kernel();
2629         return ret;
2630 }
2631
2632 /*
2633  * /dev/ttyN handling
2634  */
2635
2636 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2637 {
2638         int     retval;
2639
2640         retval = do_con_write(tty, buf, count);
2641         con_flush_chars(tty);
2642
2643         return retval;
2644 }
2645
2646 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2647 {
2648         if (in_interrupt())
2649                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2650         return do_con_write(tty, &ch, 1);
2651 }
2652
2653 static int con_write_room(struct tty_struct *tty)
2654 {
2655         if (tty->stopped)
2656                 return 0;
2657         return 4096;            /* No limit, really; we're not buffering */
2658 }
2659
2660 static int con_chars_in_buffer(struct tty_struct *tty)
2661 {
2662         return 0;               /* we're not buffering */
2663 }
2664
2665 /*
2666  * con_throttle and con_unthrottle are only used for
2667  * paste_selection(), which has to stuff in a large number of
2668  * characters...
2669  */
2670 static void con_throttle(struct tty_struct *tty)
2671 {
2672 }
2673
2674 static void con_unthrottle(struct tty_struct *tty)
2675 {
2676         struct vc_data *vc = tty->driver_data;
2677
2678         wake_up_interruptible(&vc->paste_wait);
2679 }
2680
2681 /*
2682  * Turn the Scroll-Lock LED on when the tty is stopped
2683  */
2684 static void con_stop(struct tty_struct *tty)
2685 {
2686         int console_num;
2687         if (!tty)
2688                 return;
2689         console_num = tty->index;
2690         if (!vc_cons_allocated(console_num))
2691                 return;
2692         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2693         set_leds();
2694 }
2695
2696 /*
2697  * Turn the Scroll-Lock LED off when the console is started
2698  */
2699 static void con_start(struct tty_struct *tty)
2700 {
2701         int console_num;
2702         if (!tty)
2703                 return;
2704         console_num = tty->index;
2705         if (!vc_cons_allocated(console_num))
2706                 return;
2707         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2708         set_leds();
2709 }
2710
2711 static void con_flush_chars(struct tty_struct *tty)
2712 {
2713         struct vc_data *vc;
2714
2715         if (in_interrupt())     /* from flush_to_ldisc */
2716                 return;
2717
2718         /* if we race with con_close(), vt may be null */
2719         acquire_console_sem();
2720         vc = tty->driver_data;
2721         if (vc)
2722                 set_cursor(vc);
2723         release_console_sem();
2724 }
2725
2726 /*
2727  * Allocate the console screen memory.
2728  */
2729 static int con_open(struct tty_struct *tty, struct file *filp)
2730 {
2731         unsigned int currcons = tty->index;
2732         int ret = 0;
2733
2734         acquire_console_sem();
2735         if (tty->driver_data == NULL) {
2736                 ret = vc_allocate(currcons);
2737                 if (ret == 0) {
2738                         struct vc_data *vc = vc_cons[currcons].d;
2739                         tty->driver_data = vc;
2740                         vc->vc_tty = tty;
2741
2742                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2743                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2744                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2745                         }
2746                         if (vc->vc_utf)
2747                                 tty->termios->c_iflag |= IUTF8;
2748                         else
2749                                 tty->termios->c_iflag &= ~IUTF8;
2750                         vcs_make_sysfs(tty);
2751                         release_console_sem();
2752                         return ret;
2753                 }
2754         }
2755         release_console_sem();
2756         return ret;
2757 }
2758
2759 /*
2760  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2761  * and taking a ref against the tty while we're in the process of forgetting
2762  * about it and cleaning things up.
2763  *
2764  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2765  */
2766 static void con_close(struct tty_struct *tty, struct file *filp)
2767 {
2768         mutex_lock(&tty_mutex);
2769         acquire_console_sem();
2770         if (tty && tty->count == 1) {
2771                 struct vc_data *vc = tty->driver_data;
2772
2773                 if (vc)
2774                         vc->vc_tty = NULL;
2775                 tty->driver_data = NULL;
2776                 vcs_remove_sysfs(tty);
2777                 release_console_sem();
2778                 mutex_unlock(&tty_mutex);
2779                 /*
2780                  * tty_mutex is released, but we still hold BKL, so there is
2781                  * still exclusion against init_dev()
2782                  */
2783                 return;
2784         }
2785         release_console_sem();
2786         mutex_unlock(&tty_mutex);
2787 }
2788
2789 static int default_italic_color    = 2; // green (ASCII)
2790 static int default_underline_color = 3; // cyan (ASCII)
2791 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2792 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2793
2794 static void vc_init(struct vc_data *vc, unsigned int rows,
2795                     unsigned int cols, int do_clear)
2796 {
2797         int j, k ;
2798
2799         vc->vc_cols = cols;
2800         vc->vc_rows = rows;
2801         vc->vc_size_row = cols << 1;
2802         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2803
2804         set_origin(vc);
2805         vc->vc_pos = vc->vc_origin;
2806         reset_vc(vc);
2807         for (j=k=0; j<16; j++) {
2808                 vc->vc_palette[k++] = default_red[j] ;
2809                 vc->vc_palette[k++] = default_grn[j] ;
2810                 vc->vc_palette[k++] = default_blu[j] ;
2811         }
2812         vc->vc_def_color       = 0x07;   /* white */
2813         vc->vc_ulcolor         = default_underline_color;
2814         vc->vc_itcolor         = default_italic_color;
2815         vc->vc_halfcolor       = 0x08;   /* grey */
2816         init_waitqueue_head(&vc->paste_wait);
2817         reset_terminal(vc, do_clear);
2818 }
2819
2820 /*
2821  * This routine initializes console interrupts, and does nothing
2822  * else. If you want the screen to clear, call tty_write with
2823  * the appropriate escape-sequence.
2824  */
2825
2826 static int __init con_init(void)
2827 {
2828         const char *display_desc = NULL;
2829         struct vc_data *vc;
2830         unsigned int currcons = 0, i;
2831
2832         acquire_console_sem();
2833
2834         if (conswitchp)
2835                 display_desc = conswitchp->con_startup();
2836         if (!display_desc) {
2837                 fg_console = 0;
2838                 release_console_sem();
2839                 return 0;
2840         }
2841
2842         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2843                 struct con_driver *con_driver = &registered_con_driver[i];
2844
2845                 if (con_driver->con == NULL) {
2846                         con_driver->con = conswitchp;
2847                         con_driver->desc = display_desc;
2848                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2849                         con_driver->first = 0;
2850                         con_driver->last = MAX_NR_CONSOLES - 1;
2851                         break;
2852                 }
2853         }
2854
2855         for (i = 0; i < MAX_NR_CONSOLES; i++)
2856                 con_driver_map[i] = conswitchp;
2857
2858         if (blankinterval) {
2859                 blank_state = blank_normal_wait;
2860                 mod_timer(&console_timer, jiffies + blankinterval);
2861         }
2862
2863         /*
2864          * kmalloc is not running yet - we use the bootmem allocator.
2865          */
2866         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2867                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2868                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2869                 visual_init(vc, currcons, 1);
2870                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2871                 vc->vc_kmalloced = 0;
2872                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2873                         currcons || !vc->vc_sw->con_save_screen);
2874         }
2875         currcons = fg_console = 0;
2876         master_display_fg = vc = vc_cons[currcons].d;
2877         set_origin(vc);
2878         save_screen(vc);
2879         gotoxy(vc, vc->vc_x, vc->vc_y);
2880         csi_J(vc, 0);
2881         update_screen(vc);
2882         printk("Console: %s %s %dx%d",
2883                 vc->vc_can_do_color ? "colour" : "mono",
2884                 display_desc, vc->vc_cols, vc->vc_rows);
2885         printable = 1;
2886         printk("\n");
2887
2888         release_console_sem();
2889
2890 #ifdef CONFIG_VT_CONSOLE
2891         register_console(&vt_console_driver);
2892 #endif
2893         return 0;
2894 }
2895 console_initcall(con_init);
2896
2897 static const struct tty_operations con_ops = {
2898         .open = con_open,
2899         .close = con_close,
2900         .write = con_write,
2901         .write_room = con_write_room,
2902         .put_char = con_put_char,
2903         .flush_chars = con_flush_chars,
2904         .chars_in_buffer = con_chars_in_buffer,
2905         .ioctl = vt_ioctl,
2906         .stop = con_stop,
2907         .start = con_start,
2908         .throttle = con_throttle,
2909         .unthrottle = con_unthrottle,
2910 };
2911
2912 int __init vty_init(void)
2913 {
2914         vcs_init();
2915
2916         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2917         if (!console_driver)
2918                 panic("Couldn't allocate console driver\n");
2919         console_driver->owner = THIS_MODULE;
2920         console_driver->name = "tty";
2921         console_driver->name_base = 1;
2922         console_driver->major = TTY_MAJOR;
2923         console_driver->minor_start = 1;
2924         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2925         console_driver->init_termios = tty_std_termios;
2926         if (default_utf8)
2927                 console_driver->init_termios.c_iflag |= IUTF8;
2928         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2929         tty_set_operations(console_driver, &con_ops);
2930         if (tty_register_driver(console_driver))
2931                 panic("Couldn't register console driver\n");
2932
2933         kbd_init();
2934         console_map_init();
2935 #ifdef CONFIG_PROM_CONSOLE
2936         prom_con_init();
2937 #endif
2938 #ifdef CONFIG_MDA_CONSOLE
2939         mda_console_init();
2940 #endif
2941         return 0;
2942 }
2943
2944 #ifndef VT_SINGLE_DRIVER
2945 #include <linux/device.h>
2946
2947 static struct class *vtconsole_class;
2948
2949 static int bind_con_driver(const struct consw *csw, int first, int last,
2950                            int deflt)
2951 {
2952         struct module *owner = csw->owner;
2953         const char *desc = NULL;
2954         struct con_driver *con_driver;
2955         int i, j = -1, k = -1, retval = -ENODEV;
2956
2957         if (!try_module_get(owner))
2958                 return -ENODEV;
2959
2960         acquire_console_sem();
2961
2962         /* check if driver is registered */
2963         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2964                 con_driver = &registered_con_driver[i];
2965
2966                 if (con_driver->con == csw) {
2967                         desc = con_driver->desc;
2968                         retval = 0;
2969                         break;
2970                 }
2971         }
2972
2973         if (retval)
2974                 goto err;
2975
2976         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2977                 csw->con_startup();
2978                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2979         }
2980
2981         if (deflt) {
2982                 if (conswitchp)
2983                         module_put(conswitchp->owner);
2984
2985                 __module_get(owner);
2986                 conswitchp = csw;
2987         }
2988
2989         first = max(first, con_driver->first);
2990         last = min(last, con_driver->last);
2991
2992         for (i = first; i <= last; i++) {
2993                 int old_was_color;
2994                 struct vc_data *vc = vc_cons[i].d;
2995
2996                 if (con_driver_map[i])
2997                         module_put(con_driver_map[i]->owner);
2998                 __module_get(owner);
2999                 con_driver_map[i] = csw;
3000
3001                 if (!vc || !vc->vc_sw)
3002                         continue;
3003
3004                 j = i;
3005
3006                 if (CON_IS_VISIBLE(vc)) {
3007                         k = i;
3008                         save_screen(vc);
3009                 }
3010
3011                 old_was_color = vc->vc_can_do_color;
3012                 vc->vc_sw->con_deinit(vc);
3013                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3014                 visual_init(vc, i, 0);
3015                 set_origin(vc);
3016                 update_attr(vc);
3017
3018                 /* If the console changed between mono <-> color, then
3019                  * the attributes in the screenbuf will be wrong.  The
3020                  * following resets all attributes to something sane.
3021                  */
3022                 if (old_was_color != vc->vc_can_do_color)
3023                         clear_buffer_attributes(vc);
3024         }
3025
3026         printk("Console: switching ");
3027         if (!deflt)
3028                 printk("consoles %d-%d ", first+1, last+1);
3029         if (j >= 0) {
3030                 struct vc_data *vc = vc_cons[j].d;
3031
3032                 printk("to %s %s %dx%d\n",
3033                        vc->vc_can_do_color ? "colour" : "mono",
3034                        desc, vc->vc_cols, vc->vc_rows);
3035
3036                 if (k >= 0) {
3037                         vc = vc_cons[k].d;
3038                         update_screen(vc);
3039                 }
3040         } else
3041                 printk("to %s\n", desc);
3042
3043         retval = 0;
3044 err:
3045         release_console_sem();
3046         module_put(owner);
3047         return retval;
3048 };
3049
3050 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3051 static int con_is_graphics(const struct consw *csw, int first, int last)
3052 {
3053         int i, retval = 0;
3054
3055         for (i = first; i <= last; i++) {
3056                 struct vc_data *vc = vc_cons[i].d;
3057
3058                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3059                         retval = 1;
3060                         break;
3061                 }
3062         }
3063
3064         return retval;
3065 }
3066
3067 /**
3068  * unbind_con_driver - unbind a console driver
3069  * @csw: pointer to console driver to unregister
3070  * @first: first in range of consoles that @csw should be unbound from
3071  * @last: last in range of consoles that @csw should be unbound from
3072  * @deflt: should next bound console driver be default after @csw is unbound?
3073  *
3074  * To unbind a driver from all possible consoles, pass 0 as @first and
3075  * %MAX_NR_CONSOLES as @last.
3076  *
3077  * @deflt controls whether the console that ends up replacing @csw should be
3078  * the default console.
3079  *
3080  * RETURNS:
3081  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3082  * or 0 on success.
3083  */
3084 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3085 {
3086         struct module *owner = csw->owner;
3087         const struct consw *defcsw = NULL;
3088         struct con_driver *con_driver = NULL, *con_back = NULL;
3089         int i, retval = -ENODEV;
3090
3091         if (!try_module_get(owner))
3092                 return -ENODEV;
3093
3094         acquire_console_sem();
3095
3096         /* check if driver is registered and if it is unbindable */
3097         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3098                 con_driver = &registered_con_driver[i];
3099
3100                 if (con_driver->con == csw &&
3101                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3102                         retval = 0;
3103                         break;
3104                 }
3105         }
3106
3107         if (retval) {
3108                 release_console_sem();
3109                 goto err;
3110         }
3111
3112         retval = -ENODEV;
3113
3114         /* check if backup driver exists */
3115         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3116                 con_back = &registered_con_driver[i];
3117
3118                 if (con_back->con &&
3119                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3120                         defcsw = con_back->con;
3121                         retval = 0;
3122                         break;
3123                 }
3124         }
3125
3126         if (retval) {
3127                 release_console_sem();
3128                 goto err;
3129         }
3130
3131         if (!con_is_bound(csw)) {
3132                 release_console_sem();
3133                 goto err;
3134         }
3135
3136         first = max(first, con_driver->first);
3137         last = min(last, con_driver->last);
3138
3139         for (i = first; i <= last; i++) {
3140                 if (con_driver_map[i] == csw) {
3141                         module_put(csw->owner);
3142                         con_driver_map[i] = NULL;
3143                 }
3144         }
3145
3146         if (!con_is_bound(defcsw)) {
3147                 const struct consw *defconsw = conswitchp;
3148
3149                 defcsw->con_startup();
3150                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3151                 /*
3152                  * vgacon may change the default driver to point
3153                  * to dummycon, we restore it here...
3154                  */
3155                 conswitchp = defconsw;
3156         }
3157
3158         if (!con_is_bound(csw))
3159                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3160
3161         release_console_sem();
3162         /* ignore return value, binding should not fail */
3163         bind_con_driver(defcsw, first, last, deflt);
3164 err:
3165         module_put(owner);
3166         return retval;
3167
3168 }
3169 EXPORT_SYMBOL(unbind_con_driver);
3170
3171 static int vt_bind(struct con_driver *con)
3172 {
3173         const struct consw *defcsw = NULL, *csw = NULL;
3174         int i, more = 1, first = -1, last = -1, deflt = 0;
3175
3176         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3177             con_is_graphics(con->con, con->first, con->last))
3178                 goto err;
3179
3180         csw = con->con;
3181
3182         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3183                 struct con_driver *con = &registered_con_driver[i];
3184
3185                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3186                         defcsw = con->con;
3187                         break;
3188                 }
3189         }
3190
3191         if (!defcsw)
3192                 goto err;
3193
3194         while (more) {
3195                 more = 0;
3196
3197                 for (i = con->first; i <= con->last; i++) {
3198                         if (con_driver_map[i] == defcsw) {
3199                                 if (first == -1)
3200                                         first = i;
3201                                 last = i;
3202                                 more = 1;
3203                         } else if (first != -1)
3204                                 break;
3205                 }
3206
3207                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3208                         deflt = 1;
3209
3210                 if (first != -1)
3211                         bind_con_driver(csw, first, last, deflt);
3212
3213                 first = -1;
3214                 last = -1;
3215                 deflt = 0;
3216         }
3217
3218 err:
3219         return 0;
3220 }
3221
3222 static int vt_unbind(struct con_driver *con)
3223 {
3224         const struct consw *csw = NULL;
3225         int i, more = 1, first = -1, last = -1, deflt = 0;
3226
3227         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3228             con_is_graphics(con->con, con->first, con->last))
3229                 goto err;
3230
3231         csw = con->con;
3232
3233         while (more) {
3234                 more = 0;
3235
3236                 for (i = con->first; i <= con->last; i++) {
3237                         if (con_driver_map[i] == csw) {
3238                                 if (first == -1)
3239                                         first = i;
3240                                 last = i;
3241                                 more = 1;
3242                         } else if (first != -1)
3243                                 break;
3244                 }
3245
3246                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3247                         deflt = 1;
3248
3249                 if (first != -1)
3250                         unbind_con_driver(csw, first, last, deflt);
3251
3252                 first = -1;
3253                 last = -1;
3254                 deflt = 0;
3255         }
3256
3257 err:
3258         return 0;
3259 }
3260 #else
3261 static inline int vt_bind(struct con_driver *con)
3262 {
3263         return 0;
3264 }
3265 static inline int vt_unbind(struct con_driver *con)
3266 {
3267         return 0;
3268 }
3269 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3270
3271 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3272                           const char *buf, size_t count)
3273 {
3274         struct con_driver *con = dev_get_drvdata(dev);
3275         int bind = simple_strtoul(buf, NULL, 0);
3276
3277         if (bind)
3278                 vt_bind(con);
3279         else
3280                 vt_unbind(con);
3281
3282         return count;
3283 }
3284
3285 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3286                          char *buf)
3287 {
3288         struct con_driver *con = dev_get_drvdata(dev);
3289         int bind = con_is_bound(con->con);
3290
3291         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3292 }
3293
3294 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3295                          char *buf)
3296 {
3297         struct con_driver *con = dev_get_drvdata(dev);
3298
3299         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3300                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3301                          con->desc);
3302
3303 }
3304
3305 static struct device_attribute device_attrs[] = {
3306         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3307         __ATTR(name, S_IRUGO, show_name, NULL),
3308 };
3309
3310 static int vtconsole_init_device(struct con_driver *con)
3311 {
3312         int i;
3313         int error = 0;
3314
3315         con->flag |= CON_DRIVER_FLAG_ATTR;
3316         dev_set_drvdata(con->dev, con);
3317         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3318                 error = device_create_file(con->dev, &device_attrs[i]);
3319                 if (error)
3320                         break;
3321         }
3322
3323         if (error) {
3324                 while (--i >= 0)
3325                         device_remove_file(con->dev, &device_attrs[i]);
3326                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3327         }
3328
3329         return error;
3330 }
3331
3332 static void vtconsole_deinit_device(struct con_driver *con)
3333 {
3334         int i;
3335
3336         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3337                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3338                         device_remove_file(con->dev, &device_attrs[i]);
3339                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3340         }
3341 }
3342
3343 /**
3344  * con_is_bound - checks if driver is bound to the console
3345  * @csw: console driver
3346  *
3347  * RETURNS: zero if unbound, nonzero if bound
3348  *
3349  * Drivers can call this and if zero, they should release
3350  * all resources allocated on con_startup()
3351  */
3352 int con_is_bound(const struct consw *csw)
3353 {
3354         int i, bound = 0;
3355
3356         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3357                 if (con_driver_map[i] == csw) {
3358                         bound = 1;
3359                         break;
3360                 }
3361         }
3362
3363         return bound;
3364 }
3365 EXPORT_SYMBOL(con_is_bound);
3366
3367 /**
3368  * register_con_driver - register console driver to console layer
3369  * @csw: console driver
3370  * @first: the first console to take over, minimum value is 0
3371  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3372  *
3373  * DESCRIPTION: This function registers a console driver which can later
3374  * bind to a range of consoles specified by @first and @last. It will
3375  * also initialize the console driver by calling con_startup().
3376  */
3377 int register_con_driver(const struct consw *csw, int first, int last)
3378 {
3379         struct module *owner = csw->owner;
3380         struct con_driver *con_driver;
3381         const char *desc;
3382         int i, retval = 0;
3383
3384         if (!try_module_get(owner))
3385                 return -ENODEV;
3386
3387         acquire_console_sem();
3388
3389         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3390                 con_driver = &registered_con_driver[i];
3391
3392                 /* already registered */
3393                 if (con_driver->con == csw)
3394                         retval = -EINVAL;
3395         }
3396
3397         if (retval)
3398                 goto err;
3399
3400         desc = csw->con_startup();
3401
3402         if (!desc)
3403                 goto err;
3404
3405         retval = -EINVAL;
3406
3407         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3408                 con_driver = &registered_con_driver[i];
3409
3410                 if (con_driver->con == NULL) {
3411                         con_driver->con = csw;
3412                         con_driver->desc = desc;
3413                         con_driver->node = i;
3414                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3415                                            CON_DRIVER_FLAG_INIT;
3416                         con_driver->first = first;
3417                         con_driver->last = last;
3418                         retval = 0;
3419                         break;
3420                 }
3421         }
3422
3423         if (retval)
3424                 goto err;
3425
3426         con_driver->dev = device_create_drvdata(vtconsole_class, NULL,
3427                                                 MKDEV(0, con_driver->node),
3428                                                 NULL, "vtcon%i",
3429                                                 con_driver->node);
3430
3431         if (IS_ERR(con_driver->dev)) {
3432                 printk(KERN_WARNING "Unable to create device for %s; "
3433                        "errno = %ld\n", con_driver->desc,
3434                        PTR_ERR(con_driver->dev));
3435                 con_driver->dev = NULL;
3436         } else {
3437                 vtconsole_init_device(con_driver);
3438         }
3439
3440 err:
3441         release_console_sem();
3442         module_put(owner);
3443         return retval;
3444 }
3445 EXPORT_SYMBOL(register_con_driver);
3446
3447 /**
3448  * unregister_con_driver - unregister console driver from console layer
3449  * @csw: console driver
3450  *
3451  * DESCRIPTION: All drivers that registers to the console layer must
3452  * call this function upon exit, or if the console driver is in a state
3453  * where it won't be able to handle console services, such as the
3454  * framebuffer console without loaded framebuffer drivers.
3455  *
3456  * The driver must unbind first prior to unregistration.
3457  */
3458 int unregister_con_driver(const struct consw *csw)
3459 {
3460         int i, retval = -ENODEV;
3461
3462         acquire_console_sem();
3463
3464         /* cannot unregister a bound driver */
3465         if (con_is_bound(csw))
3466                 goto err;
3467
3468         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3469                 struct con_driver *con_driver = &registered_con_driver[i];
3470
3471                 if (con_driver->con == csw &&
3472                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3473                         vtconsole_deinit_device(con_driver);
3474                         device_destroy(vtconsole_class,
3475                                        MKDEV(0, con_driver->node));
3476                         con_driver->con = NULL;
3477                         con_driver->desc = NULL;
3478                         con_driver->dev = NULL;
3479                         con_driver->node = 0;
3480                         con_driver->flag = 0;
3481                         con_driver->first = 0;
3482                         con_driver->last = 0;
3483                         retval = 0;
3484                         break;
3485                 }
3486         }
3487 err:
3488         release_console_sem();
3489         return retval;
3490 }
3491 EXPORT_SYMBOL(unregister_con_driver);
3492
3493 /*
3494  *      If we support more console drivers, this function is used
3495  *      when a driver wants to take over some existing consoles
3496  *      and become default driver for newly opened ones.
3497  *
3498  *      take_over_console is basically a register followed by unbind
3499  */
3500 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3501 {
3502         int err;
3503
3504         err = register_con_driver(csw, first, last);
3505
3506         if (!err)
3507                 bind_con_driver(csw, first, last, deflt);
3508
3509         return err;
3510 }
3511
3512 /*
3513  * give_up_console is a wrapper to unregister_con_driver. It will only
3514  * work if driver is fully unbound.
3515  */
3516 void give_up_console(const struct consw *csw)
3517 {
3518         unregister_con_driver(csw);
3519 }
3520
3521 static int __init vtconsole_class_init(void)
3522 {
3523         int i;
3524
3525         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3526         if (IS_ERR(vtconsole_class)) {
3527                 printk(KERN_WARNING "Unable to create vt console class; "
3528                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3529                 vtconsole_class = NULL;
3530         }
3531
3532         /* Add system drivers to sysfs */
3533         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3534                 struct con_driver *con = &registered_con_driver[i];
3535
3536                 if (con->con && !con->dev) {
3537                         con->dev = device_create_drvdata(vtconsole_class, NULL,
3538                                                          MKDEV(0, con->node),
3539                                                          NULL, "vtcon%i",
3540                                                          con->node);
3541
3542                         if (IS_ERR(con->dev)) {
3543                                 printk(KERN_WARNING "Unable to create "
3544                                        "device for %s; errno = %ld\n",
3545                                        con->desc, PTR_ERR(con->dev));
3546                                 con->dev = NULL;
3547                         } else {
3548                                 vtconsole_init_device(con);
3549                         }
3550                 }
3551         }
3552
3553         return 0;
3554 }
3555 postcore_initcall(vtconsole_class_init);
3556
3557 #endif
3558
3559 /*
3560  *      Screen blanking
3561  */
3562
3563 static int set_vesa_blanking(char __user *p)
3564 {
3565         unsigned int mode;
3566
3567         if (get_user(mode, p + 1))
3568                 return -EFAULT;
3569
3570         vesa_blank_mode = (mode < 4) ? mode : 0;
3571         return 0;
3572 }
3573
3574 void do_blank_screen(int entering_gfx)
3575 {
3576         struct vc_data *vc = vc_cons[fg_console].d;
3577         int i;
3578
3579         WARN_CONSOLE_UNLOCKED();
3580
3581         if (console_blanked) {
3582                 if (blank_state == blank_vesa_wait) {
3583                         blank_state = blank_off;
3584                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3585                 }
3586                 return;
3587         }
3588
3589         /* entering graphics mode? */
3590         if (entering_gfx) {
3591                 hide_cursor(vc);
3592                 save_screen(vc);
3593                 vc->vc_sw->con_blank(vc, -1, 1);
3594                 console_blanked = fg_console + 1;
3595                 blank_state = blank_off;
3596                 set_origin(vc);
3597                 return;
3598         }
3599
3600         if (blank_state != blank_normal_wait)
3601                 return;
3602         blank_state = blank_off;
3603
3604         /* don't blank graphics */
3605         if (vc->vc_mode != KD_TEXT) {
3606                 console_blanked = fg_console + 1;
3607                 return;
3608         }
3609
3610         hide_cursor(vc);
3611         del_timer_sync(&console_timer);
3612         blank_timer_expired = 0;
3613
3614         save_screen(vc);
3615         /* In case we need to reset origin, blanking hook returns 1 */
3616         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3617         console_blanked = fg_console + 1;
3618         if (i)
3619                 set_origin(vc);
3620
3621         if (console_blank_hook && console_blank_hook(1))
3622                 return;
3623
3624         if (vesa_off_interval && vesa_blank_mode) {
3625                 blank_state = blank_vesa_wait;
3626                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3627         }
3628 }
3629 EXPORT_SYMBOL(do_blank_screen);
3630
3631 /*
3632  * Called by timer as well as from vt_console_driver
3633  */
3634 void do_unblank_screen(int leaving_gfx)
3635 {
3636         struct vc_data *vc;
3637
3638         /* This should now always be called from a "sane" (read: can schedule)
3639          * context for the sake of the low level drivers, except in the special
3640          * case of oops_in_progress
3641          */
3642         if (!oops_in_progress)
3643                 might_sleep();
3644
3645         WARN_CONSOLE_UNLOCKED();
3646
3647         ignore_poke = 0;
3648         if (!console_blanked)
3649                 return;
3650         if (!vc_cons_allocated(fg_console)) {
3651                 /* impossible */
3652                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3653                 return;
3654         }
3655         vc = vc_cons[fg_console].d;
3656         if (vc->vc_mode != KD_TEXT)
3657                 return; /* but leave console_blanked != 0 */
3658
3659         if (blankinterval) {
3660                 mod_timer(&console_timer, jiffies + blankinterval);
3661                 blank_state = blank_normal_wait;
3662         }
3663
3664         console_blanked = 0;
3665         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3666                 /* Low-level driver cannot restore -> do it ourselves */
3667                 update_screen(vc);
3668         if (console_blank_hook)
3669                 console_blank_hook(0);
3670         set_palette(vc);
3671         set_cursor(vc);
3672 }
3673 EXPORT_SYMBOL(do_unblank_screen);
3674
3675 /*
3676  * This is called by the outside world to cause a forced unblank, mostly for
3677  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3678  * call it with 1 as an argument and so force a mode restore... that may kill
3679  * X or at least garbage the screen but would also make the Oops visible...
3680  */
3681 void unblank_screen(void)
3682 {
3683         do_unblank_screen(0);
3684 }
3685
3686 /*
3687  * We defer the timer blanking to work queue so it can take the console mutex
3688  * (console operations can still happen at irq time, but only from printk which
3689  * has the console mutex. Not perfect yet, but better than no locking
3690  */
3691 static void blank_screen_t(unsigned long dummy)
3692 {
3693         if (unlikely(!keventd_up())) {
3694                 mod_timer(&console_timer, jiffies + blankinterval);
3695                 return;
3696         }
3697         blank_timer_expired = 1;
3698         schedule_work(&console_work);
3699 }
3700
3701 void poke_blanked_console(void)
3702 {
3703         WARN_CONSOLE_UNLOCKED();
3704
3705         /* Add this so we quickly catch whoever might call us in a non
3706          * safe context. Nowadays, unblank_screen() isn't to be called in
3707          * atomic contexts and is allowed to schedule (with the special case
3708          * of oops_in_progress, but that isn't of any concern for this
3709          * function. --BenH.
3710          */
3711         might_sleep();
3712
3713         /* This isn't perfectly race free, but a race here would be mostly harmless,
3714          * at worse, we'll do a spurrious blank and it's unlikely
3715          */
3716         del_timer(&console_timer);
3717         blank_timer_expired = 0;
3718
3719         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3720                 return;
3721         if (console_blanked)
3722                 unblank_screen();
3723         else if (blankinterval) {
3724                 mod_timer(&console_timer, jiffies + blankinterval);
3725                 blank_state = blank_normal_wait;
3726         }
3727 }
3728
3729 /*
3730  *      Palettes
3731  */
3732
3733 static void set_palette(struct vc_data *vc)
3734 {
3735         WARN_CONSOLE_UNLOCKED();
3736
3737         if (vc->vc_mode != KD_GRAPHICS)
3738                 vc->vc_sw->con_set_palette(vc, color_table);
3739 }
3740
3741 static int set_get_cmap(unsigned char __user *arg, int set)
3742 {
3743     int i, j, k;
3744
3745     WARN_CONSOLE_UNLOCKED();
3746
3747     for (i = 0; i < 16; i++)
3748         if (set) {
3749             get_user(default_red[i], arg++);
3750             get_user(default_grn[i], arg++);
3751             get_user(default_blu[i], arg++);
3752         } else {
3753             put_user(default_red[i], arg++);
3754             put_user(default_grn[i], arg++);
3755             put_user(default_blu[i], arg++);
3756         }
3757     if (set) {
3758         for (i = 0; i < MAX_NR_CONSOLES; i++)
3759             if (vc_cons_allocated(i)) {
3760                 for (j = k = 0; j < 16; j++) {
3761                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3762                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3763                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3764                 }
3765                 set_palette(vc_cons[i].d);
3766             }
3767     }
3768     return 0;
3769 }
3770
3771 /*
3772  * Load palette into the DAC registers. arg points to a colour
3773  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3774  */
3775
3776 int con_set_cmap(unsigned char __user *arg)
3777 {
3778         int rc;
3779
3780         acquire_console_sem();
3781         rc = set_get_cmap (arg,1);
3782         release_console_sem();
3783
3784         return rc;
3785 }
3786
3787 int con_get_cmap(unsigned char __user *arg)
3788 {
3789         int rc;
3790
3791         acquire_console_sem();
3792         rc = set_get_cmap (arg,0);
3793         release_console_sem();
3794
3795         return rc;
3796 }
3797
3798 void reset_palette(struct vc_data *vc)
3799 {
3800         int j, k;
3801         for (j=k=0; j<16; j++) {
3802                 vc->vc_palette[k++] = default_red[j];
3803                 vc->vc_palette[k++] = default_grn[j];
3804                 vc->vc_palette[k++] = default_blu[j];
3805         }
3806         set_palette(vc);
3807 }
3808
3809 /*
3810  *  Font switching
3811  *
3812  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3813  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3814  *  depending on width) reserved for each character which is kinda wasty, but
3815  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3816  *  is upto the actual low-level console-driver convert data into its favorite
3817  *  format (maybe we should add a `fontoffset' field to the `display'
3818  *  structure so we won't have to convert the fontdata all the time.
3819  *  /Jes
3820  */
3821
3822 #define max_font_size 65536
3823
3824 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3825 {
3826         struct console_font font;
3827         int rc = -EINVAL;
3828         int c;
3829
3830         if (vc->vc_mode != KD_TEXT)
3831                 return -EINVAL;
3832
3833         if (op->data) {
3834                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3835                 if (!font.data)
3836                         return -ENOMEM;
3837         } else
3838                 font.data = NULL;
3839
3840         acquire_console_sem();
3841         if (vc->vc_sw->con_font_get)
3842                 rc = vc->vc_sw->con_font_get(vc, &font);
3843         else
3844                 rc = -ENOSYS;
3845         release_console_sem();
3846
3847         if (rc)
3848                 goto out;
3849
3850         c = (font.width+7)/8 * 32 * font.charcount;
3851
3852         if (op->data && font.charcount > op->charcount)
3853                 rc = -ENOSPC;
3854         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3855                 if (font.width > op->width || font.height > op->height)
3856                         rc = -ENOSPC;
3857         } else {
3858                 if (font.width != 8)
3859                         rc = -EIO;
3860                 else if ((op->height && font.height > op->height) ||
3861                          font.height > 32)
3862                         rc = -ENOSPC;
3863         }
3864         if (rc)
3865                 goto out;
3866
3867         op->height = font.height;
3868         op->width = font.width;
3869         op->charcount = font.charcount;
3870
3871         if (op->data && copy_to_user(op->data, font.data, c))
3872                 rc = -EFAULT;
3873
3874 out:
3875         kfree(font.data);
3876         return rc;
3877 }
3878
3879 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3880 {
3881         struct console_font font;
3882         int rc = -EINVAL;
3883         int size;
3884
3885         if (vc->vc_mode != KD_TEXT)
3886                 return -EINVAL;
3887         if (!op->data)
3888                 return -EINVAL;
3889         if (op->charcount > 512)
3890                 return -EINVAL;
3891         if (!op->height) {              /* Need to guess font height [compat] */
3892                 int h, i;
3893                 u8 __user *charmap = op->data;
3894                 u8 tmp;
3895
3896                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3897                    so that we can get rid of this soon */
3898                 if (!(op->flags & KD_FONT_FLAG_OLD))
3899                         return -EINVAL;
3900                 for (h = 32; h > 0; h--)
3901                         for (i = 0; i < op->charcount; i++) {
3902                                 if (get_user(tmp, &charmap[32*i+h-1]))
3903                                         return -EFAULT;
3904                                 if (tmp)
3905                                         goto nonzero;
3906                         }
3907                 return -EINVAL;
3908         nonzero:
3909                 op->height = h;
3910         }
3911         if (op->width <= 0 || op->width > 32 || op->height > 32)
3912                 return -EINVAL;
3913         size = (op->width+7)/8 * 32 * op->charcount;
3914         if (size > max_font_size)
3915                 return -ENOSPC;
3916         font.charcount = op->charcount;
3917         font.height = op->height;
3918         font.width = op->width;
3919         font.data = kmalloc(size, GFP_KERNEL);
3920         if (!font.data)
3921                 return -ENOMEM;
3922         if (copy_from_user(font.data, op->data, size)) {
3923                 kfree(font.data);
3924                 return -EFAULT;
3925         }
3926         acquire_console_sem();
3927         if (vc->vc_sw->con_font_set)
3928                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3929         else
3930                 rc = -ENOSYS;
3931         release_console_sem();
3932         kfree(font.data);
3933         return rc;
3934 }
3935
3936 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3937 {
3938         struct console_font font = {.width = op->width, .height = op->height};
3939         char name[MAX_FONT_NAME];
3940         char *s = name;
3941         int rc;
3942
3943         if (vc->vc_mode != KD_TEXT)
3944                 return -EINVAL;
3945
3946         if (!op->data)
3947                 s = NULL;
3948         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3949                 return -EFAULT;
3950         else
3951                 name[MAX_FONT_NAME - 1] = 0;
3952
3953         acquire_console_sem();
3954         if (vc->vc_sw->con_font_default)
3955                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3956         else
3957                 rc = -ENOSYS;
3958         release_console_sem();
3959         if (!rc) {
3960                 op->width = font.width;
3961                 op->height = font.height;
3962         }
3963         return rc;
3964 }
3965
3966 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3967 {
3968         int con = op->height;
3969         int rc;
3970
3971         if (vc->vc_mode != KD_TEXT)
3972                 return -EINVAL;
3973
3974         acquire_console_sem();
3975         if (!vc->vc_sw->con_font_copy)
3976                 rc = -ENOSYS;
3977         else if (con < 0 || !vc_cons_allocated(con))
3978                 rc = -ENOTTY;
3979         else if (con == vc->vc_num)     /* nothing to do */
3980                 rc = 0;
3981         else
3982                 rc = vc->vc_sw->con_font_copy(vc, con);
3983         release_console_sem();
3984         return rc;
3985 }
3986
3987 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3988 {
3989         switch (op->op) {
3990         case KD_FONT_OP_SET:
3991                 return con_font_set(vc, op);
3992         case KD_FONT_OP_GET:
3993                 return con_font_get(vc, op);
3994         case KD_FONT_OP_SET_DEFAULT:
3995                 return con_font_default(vc, op);
3996         case KD_FONT_OP_COPY:
3997                 return con_font_copy(vc, op);
3998         }
3999         return -ENOSYS;
4000 }
4001
4002 /*
4003  *      Interface exported to selection and vcs.
4004  */
4005
4006 /* used by selection */
4007 u16 screen_glyph(struct vc_data *vc, int offset)
4008 {
4009         u16 w = scr_readw(screenpos(vc, offset, 1));
4010         u16 c = w & 0xff;
4011
4012         if (w & vc->vc_hi_font_mask)
4013                 c |= 0x100;
4014         return c;
4015 }
4016 EXPORT_SYMBOL_GPL(screen_glyph);
4017
4018 /* used by vcs - note the word offset */
4019 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4020 {
4021         return screenpos(vc, 2 * w_offset, viewed);
4022 }
4023
4024 void getconsxy(struct vc_data *vc, unsigned char *p)
4025 {
4026         p[0] = vc->vc_x;
4027         p[1] = vc->vc_y;
4028 }
4029
4030 void putconsxy(struct vc_data *vc, unsigned char *p)
4031 {
4032         hide_cursor(vc);
4033         gotoxy(vc, p[0], p[1]);
4034         set_cursor(vc);
4035 }
4036
4037 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4038 {
4039         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4040                 return softcursor_original;
4041         return scr_readw(org);
4042 }
4043
4044 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4045 {
4046         scr_writew(val, org);
4047         if ((unsigned long)org == vc->vc_pos) {
4048                 softcursor_original = -1;
4049                 add_softcursor(vc);
4050         }
4051 }
4052
4053 /*
4054  *      Visible symbols for modules
4055  */
4056
4057 EXPORT_SYMBOL(color_table);
4058 EXPORT_SYMBOL(default_red);
4059 EXPORT_SYMBOL(default_grn);
4060 EXPORT_SYMBOL(default_blu);
4061 EXPORT_SYMBOL(update_region);
4062 EXPORT_SYMBOL(redraw_screen);
4063 EXPORT_SYMBOL(vc_resize);
4064 EXPORT_SYMBOL(vc_lock_resize);
4065 EXPORT_SYMBOL(fg_console);
4066 EXPORT_SYMBOL(console_blank_hook);
4067 EXPORT_SYMBOL(console_blanked);
4068 EXPORT_SYMBOL(vc_cons);
4069 #ifndef VT_SINGLE_DRIVER
4070 EXPORT_SYMBOL(take_over_console);
4071 EXPORT_SYMBOL(give_up_console);
4072 #endif