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   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton
  63  *
  64  * Removed console_lock, enabled interrupts across all console operations
  65  * 13 March 2001, Andrew Morton
  66  *
  67  * Fixed UTF-8 mode so alternate charset modes always work according
  68  * to control sequences interpreted in do_con_trol function
  69  * preserving backward VT100 semigraphics compatibility,
  70  * malformed UTF sequences represented as sequences of replacement glyphs,
  71  * original codes or '?' as a last resort if replacement glyph is undefined
  72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  73  */
  74
  75 #include <linux/module.h>
  76 #include <linux/types.h>
  77 #include <linux/sched.h>
  78 #include <linux/tty.h>
  79 #include <linux/tty_flip.h>
  80 #include <linux/kernel.h>
  81 #include <linux/string.h>
  82 #include <linux/errno.h>
  83 #include <linux/kd.h>
  84 #include <linux/slab.h>
  85 #include <linux/major.h>
  86 #include <linux/mm.h>
  87 #include <linux/console.h>
  88 #include <linux/init.h>
  89 #include <linux/mutex.h>
  90 #include <linux/vt_kern.h>
  91 #include <linux/selection.h>
  92 #include <linux/tiocl.h>
  93 #include <linux/kbd_kern.h>
  94 #include <linux/consolemap.h>
  95 #include <linux/timer.h>
  96 #include <linux/interrupt.h>
  97 #include <linux/workqueue.h>
  98 #include <linux/bootmem.h>
  99 #include <linux/pm.h>
 100 #include <linux/font.h>
 101 #include <linux/bitops.h>
 102 #include <linux/notifier.h>
 103 #include <linux/device.h>
 104 #include <linux/io.h>
 105 #include <asm/system.h>
 106 #include <linux/uaccess.h>
 107
 108 #define MAX_NR_CON_DRIVER 16
 109
 110 #define CON_DRIVER_FLAG_MODULE 1
 111 #define CON_DRIVER_FLAG_INIT   2
 112 #define CON_DRIVER_FLAG_ATTR   4
 113
 114 struct con_driver {
 115         const struct consw *con;
 116         const char *desc;
 117         struct device *dev;
 118         int node;
 119         int first;
 120         int last;
 121         int flag;
 122 };
 123
 124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 125 const struct consw *conswitchp;
 126
 127 /* A bitmap for codes <32. A bit of 1 indicates that the code
 128  * corresponding to that bit number invokes some special action
 129  * (such as cursor movement) and should not be displayed as a
 130  * glyph unless the disp_ctrl mode is explicitly enabled.
 131  */
 132 #define CTRL_ACTION 0x0d00ff81
 133 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 134
 135 /*
 136  * Here is the default bell parameters: 750HZ, 1/8th of a second
 137  */
 138 #define DEFAULT_BELL_PITCH      750
 139 #define DEFAULT_BELL_DURATION   (HZ/8)
 140
 141 struct vc vc_cons [MAX_NR_CONSOLES];
 142
 143 #ifndef VT_SINGLE_DRIVER
 144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 145 #endif
 146
 147 static int con_open(struct tty_struct *, struct file *);
 148 static void vc_init(struct vc_data *vc, unsigned int rows,
 149                     unsigned int cols, int do_clear);
 150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 151 static void save_cur(struct vc_data *vc);
 152 static void reset_terminal(struct vc_data *vc, int do_clear);
 153 static void con_flush_chars(struct tty_struct *tty);
 154 static int set_vesa_blanking(char __user *p);
 155 static void set_cursor(struct vc_data *vc);
 156 static void hide_cursor(struct vc_data *vc);
 157 static void console_callback(struct work_struct *ignored);
 158 static void blank_screen_t(unsigned long dummy);
 159 static void set_palette(struct vc_data *vc);
 160
 161 static int printable;           /* Is console ready for printing? */
 162 int default_utf8 = true;
 163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 164
 165 /*
 166  * ignore_poke: don't unblank the screen when things are typed.  This is
 167  * mainly for the privacy of braille terminal users.
 168  */
 169 static int ignore_poke;
 170
 171 int do_poke_blanked_console;
 172 int console_blanked;
 173
 174 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 175 static int blankinterval = 10*60*HZ;
 176 static int vesa_off_interval;
 177
 178 static DECLARE_WORK(console_work, console_callback);
 179
 180 /*
 181  * fg_console is the current virtual console,
 182  * last_console is the last used one,
 183  * want_console is the console we want to switch to,
 184  * kmsg_redirect is the console for kernel messages,
 185  */
 186 int fg_console;
 187 int last_console;
 188 int want_console = -1;
 189 int kmsg_redirect;
 190
 191 /*
 192  * For each existing display, we have a pointer to console currently visible
 193  * on that display, allowing consoles other than fg_console to be refreshed
 194  * appropriately. Unless the low-level driver supplies its own display_fg
 195  * variable, we use this one for the "master display".
 196  */
 197 static struct vc_data *master_display_fg;
 198
 199 /*
 200  * Unfortunately, we need to delay tty echo when we're currently writing to the
 201  * console since the code is (and always was) not re-entrant, so we schedule
 202  * all flip requests to process context with schedule-task() and run it from
 203  * console_callback().
 204  */
 205
 206 /*
 207  * For the same reason, we defer scrollback to the console callback.
 208  */
 209 static int scrollback_delta;
 210
 211 /*
 212  * Hook so that the power management routines can (un)blank
 213  * the console on our behalf.
 214  */
 215 int (*console_blank_hook)(int);
 216
 217 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 218 static int blank_state;
 219 static int blank_timer_expired;
 220 enum {
 221         blank_off = 0,
 222         blank_normal_wait,
 223         blank_vesa_wait,
 224 };
 225
 226 /*
 227  * Notifier list for console events.
 228  */
 229 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 230
 231 int register_vt_notifier(struct notifier_block *nb)
 232 {
 233         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 234 }
 235 EXPORT_SYMBOL_GPL(register_vt_notifier);
 236
 237 int unregister_vt_notifier(struct notifier_block *nb)
 238 {
 239         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 240 }
 241 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 242
 243 static void notify_write(struct vc_data *vc, unsigned int unicode)
 244 {
 245         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 246         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 247 }
 248
 249 static void notify_update(struct vc_data *vc)
 250 {
 251         struct vt_notifier_param param = { .vc = vc };
 252         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 253 }
 254
 255 /*
 256  *      Low-Level Functions
 257  */
 258
 259 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 260
 261 #ifdef VT_BUF_VRAM_ONLY
 262 #define DO_UPDATE(vc)   0
 263 #else
 264 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 265 #endif
 266
 267 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 268 {
 269         unsigned short *p;
 270
 271         if (!viewed)
 272                 p = (unsigned short *)(vc->vc_origin + offset);
 273         else if (!vc->vc_sw->con_screen_pos)
 274                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 275         else
 276                 p = vc->vc_sw->con_screen_pos(vc, offset);
 277         return p;
 278 }
 279
 280 static inline void scrolldelta(int lines)
 281 {
 282         scrollback_delta += lines;
 283         schedule_console_callback();
 284 }
 285
 286 void schedule_console_callback(void)
 287 {
 288         schedule_work(&console_work);
 289 }
 290
 291 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 292 {
 293         unsigned short *d, *s;
 294
 295         if (t+nr >= b)
 296                 nr = b - t - 1;
 297         if (b > vc->vc_rows || t >= b || nr < 1)
 298                 return;
 299         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 300                 return;
 301         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 302         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 303         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 304         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 305                     vc->vc_size_row * nr);
 306 }
 307
 308 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 309 {
 310         unsigned short *s;
 311         unsigned int step;
 312
 313         if (t+nr >= b)
 314                 nr = b - t - 1;
 315         if (b > vc->vc_rows || t >= b || nr < 1)
 316                 return;
 317         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 318                 return;
 319         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 320         step = vc->vc_cols * nr;
 321         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 322         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 323 }
 324
 325 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 326 {
 327 #ifndef VT_BUF_VRAM_ONLY
 328         unsigned int xx, yy, offset;
 329         u16 *p;
 330
 331         p = (u16 *) start;
 332         if (!vc->vc_sw->con_getxy) {
 333                 offset = (start - vc->vc_origin) / 2;
 334                 xx = offset % vc->vc_cols;
 335                 yy = offset / vc->vc_cols;
 336         } else {
 337                 int nxx, nyy;
 338                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 339                 xx = nxx; yy = nyy;
 340         }
 341         for(;;) {
 342                 u16 attrib = scr_readw(p) & 0xff00;
 343                 int startx = xx;
 344                 u16 *q = p;
 345                 while (xx < vc->vc_cols && count) {
 346                         if (attrib != (scr_readw(p) & 0xff00)) {
 347                                 if (p > q)
 348                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 349                                 startx = xx;
 350                                 q = p;
 351                                 attrib = scr_readw(p) & 0xff00;
 352                         }
 353                         p++;
 354                         xx++;
 355                         count--;
 356                 }
 357                 if (p > q)
 358                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 359                 if (!count)
 360                         break;
 361                 xx = 0;
 362                 yy++;
 363                 if (vc->vc_sw->con_getxy) {
 364                         p = (u16 *)start;
 365                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 366                 }
 367         }
 368 #endif
 369 }
 370
 371 void update_region(struct vc_data *vc, unsigned long start, int count)
 372 {
 373         WARN_CONSOLE_UNLOCKED();
 374
 375         if (DO_UPDATE(vc)) {
 376                 hide_cursor(vc);
 377                 do_update_region(vc, start, count);
 378                 set_cursor(vc);
 379         }
 380 }
 381
 382 /* Structure of attributes is hardware-dependent */
 383
 384 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 385     u8 _underline, u8 _reverse, u8 _italic)
 386 {
 387         if (vc->vc_sw->con_build_attr)
 388                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 389                        _blink, _underline, _reverse, _italic);
 390
 391 #ifndef VT_BUF_VRAM_ONLY
 392 /*
 393  * ++roman: I completely changed the attribute format for monochrome
 394  * mode (!can_do_color). The formerly used MDA (monochrome display
 395  * adapter) format didn't allow the combination of certain effects.
 396  * Now the attribute is just a bit vector:
 397  *  Bit 0..1: intensity (0..2)
 398  *  Bit 2   : underline
 399  *  Bit 3   : reverse
 400  *  Bit 7   : blink
 401  */
 402         {
 403         u8 a = _color;
 404         if (!vc->vc_can_do_color)
 405                 return _intensity |
 406                        (_italic ? 2 : 0) |
 407                        (_underline ? 4 : 0) |
 408                        (_reverse ? 8 : 0) |
 409                        (_blink ? 0x80 : 0);
 410         if (_italic)
 411                 a = (a & 0xF0) | vc->vc_itcolor;
 412         else if (_underline)
 413                 a = (a & 0xf0) | vc->vc_ulcolor;
 414         else if (_intensity == 0)
 415                 a = (a & 0xf0) | vc->vc_ulcolor;
 416         if (_reverse)
 417                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 418         if (_blink)
 419                 a ^= 0x80;
 420         if (_intensity == 2)
 421                 a ^= 0x08;
 422         if (vc->vc_hi_font_mask == 0x100)
 423                 a <<= 1;
 424         return a;
 425         }
 426 #else
 427         return 0;
 428 #endif
 429 }
 430
 431 static void update_attr(struct vc_data *vc)
 432 {
 433         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 434                       vc->vc_blink, vc->vc_underline,
 435                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 436         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 437 }
 438
 439 /* Note: inverting the screen twice should revert to the original state */
 440 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 441 {
 442         unsigned short *p;
 443
 444         WARN_CONSOLE_UNLOCKED();
 445
 446         count /= 2;
 447         p = screenpos(vc, offset, viewed);
 448         if (vc->vc_sw->con_invert_region)
 449                 vc->vc_sw->con_invert_region(vc, p, count);
 450 #ifndef VT_BUF_VRAM_ONLY
 451         else {
 452                 u16 *q = p;
 453                 int cnt = count;
 454                 u16 a;
 455
 456                 if (!vc->vc_can_do_color) {
 457                         while (cnt--) {
 458                             a = scr_readw(q);
 459                             a ^= 0x0800;
 460                             scr_writew(a, q);
 461                             q++;
 462                         }
 463                 } else if (vc->vc_hi_font_mask == 0x100) {
 464                         while (cnt--) {
 465                                 a = scr_readw(q);
 466                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 467                                 scr_writew(a, q);
 468                                 q++;
 469                         }
 470                 } else {
 471                         while (cnt--) {
 472                                 a = scr_readw(q);
 473                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 474                                 scr_writew(a, q);
 475                                 q++;
 476                         }
 477                 }
 478         }
 479 #endif
 480         if (DO_UPDATE(vc))
 481                 do_update_region(vc, (unsigned long) p, count);
 482 }
 483
 484 /* used by selection: complement pointer position */
 485 void complement_pos(struct vc_data *vc, int offset)
 486 {
 487         static int old_offset = -1;
 488         static unsigned short old;
 489         static unsigned short oldx, oldy;
 490
 491         WARN_CONSOLE_UNLOCKED();
 492
 493         if (old_offset != -1 && old_offset >= 0 &&
 494             old_offset < vc->vc_screenbuf_size) {
 495                 scr_writew(old, screenpos(vc, old_offset, 1));
 496                 if (DO_UPDATE(vc))
 497                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 498         }
 499
 500         old_offset = offset;
 501
 502         if (offset != -1 && offset >= 0 &&
 503             offset < vc->vc_screenbuf_size) {
 504                 unsigned short new;
 505                 unsigned short *p;
 506                 p = screenpos(vc, offset, 1);
 507                 old = scr_readw(p);
 508                 new = old ^ vc->vc_complement_mask;
 509                 scr_writew(new, p);
 510                 if (DO_UPDATE(vc)) {
 511                         oldx = (offset >> 1) % vc->vc_cols;
 512                         oldy = (offset >> 1) / vc->vc_cols;
 513                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 514                 }
 515         }
 516
 517 }
 518
 519 static void insert_char(struct vc_data *vc, unsigned int nr)
 520 {
 521         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 522
 523         p = q + vc->vc_cols - nr - vc->vc_x;
 524         while (--p >= q)
 525                 scr_writew(scr_readw(p), p + nr);
 526         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 527         vc->vc_need_wrap = 0;
 528         if (DO_UPDATE(vc)) {
 529                 unsigned short oldattr = vc->vc_attr;
 530                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 531                                      vc->vc_cols - vc->vc_x - nr);
 532                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 533                 while (nr--)
 534                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 535                 vc->vc_attr = oldattr;
 536         }
 537 }
 538
 539 static void delete_char(struct vc_data *vc, unsigned int nr)
 540 {
 541         unsigned int i = vc->vc_x;
 542         unsigned short *p = (unsigned short *)vc->vc_pos;
 543
 544         while (++i <= vc->vc_cols - nr) {
 545                 scr_writew(scr_readw(p+nr), p);
 546                 p++;
 547         }
 548         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 549         vc->vc_need_wrap = 0;
 550         if (DO_UPDATE(vc)) {
 551                 unsigned short oldattr = vc->vc_attr;
 552                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 553                                      vc->vc_cols - vc->vc_x - nr);
 554                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 555                 while (nr--)
 556                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 557                                      vc->vc_cols - 1 - nr);
 558                 vc->vc_attr = oldattr;
 559         }
 560 }
 561
 562 static int softcursor_original;
 563
 564 static void add_softcursor(struct vc_data *vc)
 565 {
 566         int i = scr_readw((u16 *) vc->vc_pos);
 567         u32 type = vc->vc_cursor_type;
 568
 569         if (! (type & 0x10)) return;
 570         if (softcursor_original != -1) return;
 571         softcursor_original = i;
 572         i |= ((type >> 8) & 0xff00 );
 573         i ^= ((type) & 0xff00 );
 574         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 575         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 576         scr_writew(i, (u16 *) vc->vc_pos);
 577         if (DO_UPDATE(vc))
 578                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 579 }
 580
 581 static void hide_softcursor(struct vc_data *vc)
 582 {
 583         if (softcursor_original != -1) {
 584                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 585                 if (DO_UPDATE(vc))
 586                         vc->vc_sw->con_putc(vc, softcursor_original,
 587                                         vc->vc_y, vc->vc_x);
 588                 softcursor_original = -1;
 589         }
 590 }
 591
 592 static void hide_cursor(struct vc_data *vc)
 593 {
 594         if (vc == sel_cons)
 595                 clear_selection();
 596         vc->vc_sw->con_cursor(vc, CM_ERASE);
 597         hide_softcursor(vc);
 598 }
 599
 600 static void set_cursor(struct vc_data *vc)
 601 {
 602         if (!IS_FG(vc) || console_blanked ||
 603             vc->vc_mode == KD_GRAPHICS)
 604                 return;
 605         if (vc->vc_deccm) {
 606                 if (vc == sel_cons)
 607                         clear_selection();
 608                 add_softcursor(vc);
 609                 if ((vc->vc_cursor_type & 0x0f) != 1)
 610                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 611         } else
 612                 hide_cursor(vc);
 613 }
 614
 615 static void set_origin(struct vc_data *vc)
 616 {
 617         WARN_CONSOLE_UNLOCKED();
 618
 619         if (!CON_IS_VISIBLE(vc) ||
 620             !vc->vc_sw->con_set_origin ||
 621             !vc->vc_sw->con_set_origin(vc))
 622                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 623         vc->vc_visible_origin = vc->vc_origin;
 624         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 625         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 626 }
 627
 628 static inline void save_screen(struct vc_data *vc)
 629 {
 630         WARN_CONSOLE_UNLOCKED();
 631
 632         if (vc->vc_sw->con_save_screen)
 633                 vc->vc_sw->con_save_screen(vc);
 634 }
 635
 636 /*
 637  *      Redrawing of screen
 638  */
 639
 640 static void clear_buffer_attributes(struct vc_data *vc)
 641 {
 642         unsigned short *p = (unsigned short *)vc->vc_origin;
 643         int count = vc->vc_screenbuf_size / 2;
 644         int mask = vc->vc_hi_font_mask | 0xff;
 645
 646         for (; count > 0; count--, p++) {
 647                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 648         }
 649 }
 650
 651 void redraw_screen(struct vc_data *vc, int is_switch)
 652 {
 653         int redraw = 0;
 654
 655         WARN_CONSOLE_UNLOCKED();
 656
 657         if (!vc) {
 658                 /* strange ... */
 659                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 660                 return;
 661         }
 662
 663         if (is_switch) {
 664                 struct vc_data *old_vc = vc_cons[fg_console].d;
 665                 if (old_vc == vc)
 666                         return;
 667                 if (!CON_IS_VISIBLE(vc))
 668                         redraw = 1;
 669                 *vc->vc_display_fg = vc;
 670                 fg_console = vc->vc_num;
 671                 hide_cursor(old_vc);
 672                 if (!CON_IS_VISIBLE(old_vc)) {
 673                         save_screen(old_vc);
 674                         set_origin(old_vc);
 675                 }
 676         } else {
 677                 hide_cursor(vc);
 678                 redraw = 1;
 679         }
 680
 681         if (redraw) {
 682                 int update;
 683                 int old_was_color = vc->vc_can_do_color;
 684
 685                 set_origin(vc);
 686                 update = vc->vc_sw->con_switch(vc);
 687                 set_palette(vc);
 688                 /*
 689                  * If console changed from mono<->color, the best we can do
 690                  * is to clear the buffer attributes. As it currently stands,
 691                  * rebuilding new attributes from the old buffer is not doable
 692                  * without overly complex code.
 693                  */
 694                 if (old_was_color != vc->vc_can_do_color) {
 695                         update_attr(vc);
 696                         clear_buffer_attributes(vc);
 697                 }
 698                 if (update && vc->vc_mode != KD_GRAPHICS)
 699                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 700         }
 701         set_cursor(vc);
 702         if (is_switch) {
 703                 set_leds();
 704                 compute_shiftstate();
 705                 notify_update(vc);
 706         }
 707 }
 708
 709 /*
 710  *      Allocation, freeing and resizing of VTs.
 711  */
 712
 713 int vc_cons_allocated(unsigned int i)
 714 {
 715         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 716 }
 717
 718 static void visual_init(struct vc_data *vc, int num, int init)
 719 {
 720         /* ++Geert: vc->vc_sw->con_init determines console size */
 721         if (vc->vc_sw)
 722                 module_put(vc->vc_sw->owner);
 723         vc->vc_sw = conswitchp;
 724 #ifndef VT_SINGLE_DRIVER
 725         if (con_driver_map[num])
 726                 vc->vc_sw = con_driver_map[num];
 727 #endif
 728         __module_get(vc->vc_sw->owner);
 729         vc->vc_num = num;
 730         vc->vc_display_fg = &master_display_fg;
 731         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 732         vc->vc_uni_pagedir = 0;
 733         vc->vc_hi_font_mask = 0;
 734         vc->vc_complement_mask = 0;
 735         vc->vc_can_do_color = 0;
 736         vc->vc_sw->con_init(vc, init);
 737         if (!vc->vc_complement_mask)
 738                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 739         vc->vc_s_complement_mask = vc->vc_complement_mask;
 740         vc->vc_size_row = vc->vc_cols << 1;
 741         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 742 }
 743
 744 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 745 {
 746         WARN_CONSOLE_UNLOCKED();
 747
 748         if (currcons >= MAX_NR_CONSOLES)
 749                 return -ENXIO;
 750         if (!vc_cons[currcons].d) {
 751             struct vc_data *vc;
 752             struct vt_notifier_param param;
 753
 754             /* prevent users from taking too much memory */
 755             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 756               return -EPERM;
 757
 758             /* due to the granularity of kmalloc, we waste some memory here */
 759             /* the alloc is done in two steps, to optimize the common situation
 760                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 761             /* although the numbers above are not valid since long ago, the
 762                point is still up-to-date and the comment still has its value
 763                even if only as a historical artifact.  --mj, July 1998 */
 764             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 765             if (!vc)
 766                 return -ENOMEM;
 767             vc_cons[currcons].d = vc;
 768             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 769             visual_init(vc, currcons, 1);
 770             if (!*vc->vc_uni_pagedir_loc)
 771                 con_set_default_unimap(vc);
 772             if (!vc->vc_kmalloced)
 773                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 774             if (!vc->vc_screenbuf) {
 775                 kfree(vc);
 776                 vc_cons[currcons].d = NULL;
 777                 return -ENOMEM;
 778             }
 779             vc->vc_kmalloced = 1;
 780             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 781             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 782         }
 783         return 0;
 784 }
 785
 786 static inline int resize_screen(struct vc_data *vc, int width, int height,
 787                                 int user)
 788 {
 789         /* Resizes the resolution of the display adapater */
 790         int err = 0;
 791
 792         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 793                 err = vc->vc_sw->con_resize(vc, width, height, user);
 794
 795         return err;
 796 }
 797
 798 /*
 799  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 800  * [this is to be used together with some user program
 801  * like resize that changes the hardware videomode]
 802  */
 803 #define VC_RESIZE_MAXCOL (32767)
 804 #define VC_RESIZE_MAXROW (32767)
 805
 806 /**
 807  *      vc_do_resize    -       resizing method for the tty
 808  *      @tty: tty being resized
 809  *      @real_tty: real tty (different to tty if a pty/tty pair)
 810  *      @vc: virtual console private data
 811  *      @cols: columns
 812  *      @lines: lines
 813  *
 814  *      Resize a virtual console, clipping according to the actual constraints.
 815  *      If the caller passes a tty structure then update the termios winsize
 816  *      information and perform any neccessary signal handling.
 817  *
 818  *      Caller must hold the console semaphore. Takes the termios mutex and
 819  *      ctrl_lock of the tty IFF a tty is passed.
 820  */
 821
 822 static int vc_do_resize(struct tty_struct *tty, struct tty_struct *real_tty,
 823                 struct vc_data *vc, unsigned int cols, unsigned int lines)
 824 {
 825         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 826         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 827         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 828         unsigned int end, user;
 829         unsigned short *newscreen;
 830
 831         WARN_CONSOLE_UNLOCKED();
 832
 833         if (!vc)
 834                 return -ENXIO;
 835
 836         user = vc->vc_resize_user;
 837         vc->vc_resize_user = 0;
 838
 839         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 840                 return -EINVAL;
 841
 842         new_cols = (cols ? cols : vc->vc_cols);
 843         new_rows = (lines ? lines : vc->vc_rows);
 844         new_row_size = new_cols << 1;
 845         new_screen_size = new_row_size * new_rows;
 846
 847         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 848                 return 0;
 849
 850         newscreen = kmalloc(new_screen_size, GFP_USER);
 851         if (!newscreen)
 852                 return -ENOMEM;
 853
 854         old_rows = vc->vc_rows;
 855         old_cols = vc->vc_cols;
 856         old_row_size = vc->vc_size_row;
 857         old_screen_size = vc->vc_screenbuf_size;
 858
 859         err = resize_screen(vc, new_cols, new_rows, user);
 860         if (err) {
 861                 kfree(newscreen);
 862                 return err;
 863         }
 864
 865         vc->vc_rows = new_rows;
 866         vc->vc_cols = new_cols;
 867         vc->vc_size_row = new_row_size;
 868         vc->vc_screenbuf_size = new_screen_size;
 869
 870         rlth = min(old_row_size, new_row_size);
 871         rrem = new_row_size - rlth;
 872         old_origin = vc->vc_origin;
 873         new_origin = (long) newscreen;
 874         new_scr_end = new_origin + new_screen_size;
 875
 876         if (vc->vc_y > new_rows) {
 877                 if (old_rows - vc->vc_y < new_rows) {
 878                         /*
 879                          * Cursor near the bottom, copy contents from the
 880                          * bottom of buffer
 881                          */
 882                         old_origin += (old_rows - new_rows) * old_row_size;
 883                         end = vc->vc_scr_end;
 884                 } else {
 885                         /*
 886                          * Cursor is in no man's land, copy 1/2 screenful
 887                          * from the top and bottom of cursor position
 888                          */
 889                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 890                         end = old_origin + (old_row_size * new_rows);
 891                 }
 892         } else
 893                 /*
 894                  * Cursor near the top, copy contents from the top of buffer
 895                  */
 896                 end = (old_rows > new_rows) ? old_origin +
 897                         (old_row_size * new_rows) :
 898                         vc->vc_scr_end;
 899
 900         update_attr(vc);
 901
 902         while (old_origin < end) {
 903                 scr_memcpyw((unsigned short *) new_origin,
 904                             (unsigned short *) old_origin, rlth);
 905                 if (rrem)
 906                         scr_memsetw((void *)(new_origin + rlth),
 907                                     vc->vc_video_erase_char, rrem);
 908                 old_origin += old_row_size;
 909                 new_origin += new_row_size;
 910         }
 911         if (new_scr_end > new_origin)
 912                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 913                             new_scr_end - new_origin);
 914         if (vc->vc_kmalloced)
 915                 kfree(vc->vc_screenbuf);
 916         vc->vc_screenbuf = newscreen;
 917         vc->vc_kmalloced = 1;
 918         vc->vc_screenbuf_size = new_screen_size;
 919         set_origin(vc);
 920
 921         /* do part of a reset_terminal() */
 922         vc->vc_top = 0;
 923         vc->vc_bottom = vc->vc_rows;
 924         gotoxy(vc, vc->vc_x, vc->vc_y);
 925         save_cur(vc);
 926
 927         if (tty) {
 928                 /* Rewrite the requested winsize data with the actual
 929                    resulting sizes */
 930                 struct winsize ws;
 931                 memset(&ws, 0, sizeof(ws));
 932                 ws.ws_row = vc->vc_rows;
 933                 ws.ws_col = vc->vc_cols;
 934                 ws.ws_ypixel = vc->vc_scan_lines;
 935                 tty_do_resize(tty, real_tty, &ws);
 936         }
 937
 938         if (CON_IS_VISIBLE(vc))
 939                 update_screen(vc);
 940         return err;
 941 }
 942
 943 /**
 944  *      vc_resize               -       resize a VT
 945  *      @vc: virtual console
 946  *      @cols: columns
 947  *      @rows: rows
 948  *
 949  *      Resize a virtual console as seen from the console end of things. We
 950  *      use the common vc_do_resize methods to update the structures. The
 951  *      caller must hold the console sem to protect console internals and
 952  *      vc->vc_tty
 953  */
 954
 955 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 956 {
 957         return vc_do_resize(vc->vc_tty, vc->vc_tty, vc, cols, rows);
 958 }
 959
 960 /**
 961  *      vt_resize               -       resize a VT
 962  *      @tty: tty to resize
 963  *      @real_tty: tty if a pty/tty pair
 964  *      @ws: winsize attributes
 965  *
 966  *      Resize a virtual terminal. This is called by the tty layer as we
 967  *      register our own handler for resizing. The mutual helper does all
 968  *      the actual work.
 969  *
 970  *      Takes the console sem and the called methods then take the tty
 971  *      termios_mutex and the tty ctrl_lock in that order.
 972  */
 973
 974 int vt_resize(struct tty_struct *tty, struct tty_struct *real_tty,
 975         struct winsize *ws)
 976 {
 977         struct vc_data *vc = tty->driver_data;
 978         int ret;
 979
 980         acquire_console_sem();
 981         ret = vc_do_resize(tty, real_tty, vc, ws->ws_col, ws->ws_row);
 982         release_console_sem();
 983         return ret;
 984 }
 985
 986 void vc_deallocate(unsigned int currcons)
 987 {
 988         WARN_CONSOLE_UNLOCKED();
 989
 990         if (vc_cons_allocated(currcons)) {
 991                 struct vc_data *vc = vc_cons[currcons].d;
 992                 struct vt_notifier_param param = { .vc = vc };
 993                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 994                 vc->vc_sw->con_deinit(vc);
 995                 put_pid(vc->vt_pid);
 996                 module_put(vc->vc_sw->owner);
 997                 if (vc->vc_kmalloced)
 998                         kfree(vc->vc_screenbuf);
 999                 if (currcons >= MIN_NR_CONSOLES)
1000                         kfree(vc);
1001                 vc_cons[currcons].d = NULL;
1002         }
1003 }
1004
1005 /*
1006  *      VT102 emulator
1007  */
1008
1009 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1010 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1011 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1012
1013 #define decarm          VC_REPEAT
1014 #define decckm          VC_CKMODE
1015 #define kbdapplic       VC_APPLIC
1016 #define lnm             VC_CRLF
1017
1018 /*
1019  * this is what the terminal answers to a ESC-Z or csi0c query.
1020  */
1021 #define VT100ID "\033[?1;2c"
1022 #define VT102ID "\033[?6c"
1023
1024 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1025                                        8,12,10,14, 9,13,11,15 };
1026
1027 /* the default colour table, for VGA+ colour systems */
1028 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1029     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1030 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1031     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1032 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1033     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1034
1035 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1036 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1037 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1038
1039 /*
1040  * gotoxy() must verify all boundaries, because the arguments
1041  * might also be negative. If the given position is out of
1042  * bounds, the cursor is placed at the nearest margin.
1043  */
1044 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1045 {
1046         int min_y, max_y;
1047
1048         if (new_x < 0)
1049                 vc->vc_x = 0;
1050         else {
1051                 if (new_x >= vc->vc_cols)
1052                         vc->vc_x = vc->vc_cols - 1;
1053                 else
1054                         vc->vc_x = new_x;
1055         }
1056
1057         if (vc->vc_decom) {
1058                 min_y = vc->vc_top;
1059                 max_y = vc->vc_bottom;
1060         } else {
1061                 min_y = 0;
1062                 max_y = vc->vc_rows;
1063         }
1064         if (new_y < min_y)
1065                 vc->vc_y = min_y;
1066         else if (new_y >= max_y)
1067                 vc->vc_y = max_y - 1;
1068         else
1069                 vc->vc_y = new_y;
1070         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1071         vc->vc_need_wrap = 0;
1072 }
1073
1074 /* for absolute user moves, when decom is set */
1075 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1076 {
1077         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1078 }
1079
1080 void scrollback(struct vc_data *vc, int lines)
1081 {
1082         if (!lines)
1083                 lines = vc->vc_rows / 2;
1084         scrolldelta(-lines);
1085 }
1086
1087 void scrollfront(struct vc_data *vc, int lines)
1088 {
1089         if (!lines)
1090                 lines = vc->vc_rows / 2;
1091         scrolldelta(lines);
1092 }
1093
1094 static void lf(struct vc_data *vc)
1095 {
1096         /* don't scroll if above bottom of scrolling region, or
1097          * if below scrolling region
1098          */
1099         if (vc->vc_y + 1 == vc->vc_bottom)
1100                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1101         else if (vc->vc_y < vc->vc_rows - 1) {
1102                 vc->vc_y++;
1103                 vc->vc_pos += vc->vc_size_row;
1104         }
1105         vc->vc_need_wrap = 0;
1106         notify_write(vc, '\n');
1107 }
1108
1109 static void ri(struct vc_data *vc)
1110 {
1111         /* don't scroll if below top of scrolling region, or
1112          * if above scrolling region
1113          */
1114         if (vc->vc_y == vc->vc_top)
1115                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1116         else if (vc->vc_y > 0) {
1117                 vc->vc_y--;
1118                 vc->vc_pos -= vc->vc_size_row;
1119         }
1120         vc->vc_need_wrap = 0;
1121 }
1122
1123 static inline void cr(struct vc_data *vc)
1124 {
1125         vc->vc_pos -= vc->vc_x << 1;
1126         vc->vc_need_wrap = vc->vc_x = 0;
1127         notify_write(vc, '\r');
1128 }
1129
1130 static inline void bs(struct vc_data *vc)
1131 {
1132         if (vc->vc_x) {
1133                 vc->vc_pos -= 2;
1134                 vc->vc_x--;
1135                 vc->vc_need_wrap = 0;
1136                 notify_write(vc, '\b');
1137         }
1138 }
1139
1140 static inline void del(struct vc_data *vc)
1141 {
1142         /* ignored */
1143 }
1144
1145 static void csi_J(struct vc_data *vc, int vpar)
1146 {
1147         unsigned int count;
1148         unsigned short * start;
1149
1150         switch (vpar) {
1151                 case 0: /* erase from cursor to end of display */
1152                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1153                         start = (unsigned short *)vc->vc_pos;
1154                         if (DO_UPDATE(vc)) {
1155                                 /* do in two stages */
1156                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1157                                               vc->vc_cols - vc->vc_x);
1158                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1159                                               vc->vc_rows - vc->vc_y - 1,
1160                                               vc->vc_cols);
1161                         }
1162                         break;
1163                 case 1: /* erase from start to cursor */
1164                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1165                         start = (unsigned short *)vc->vc_origin;
1166                         if (DO_UPDATE(vc)) {
1167                                 /* do in two stages */
1168                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1169                                               vc->vc_cols);
1170                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1171                                               vc->vc_x + 1);
1172                         }
1173                         break;
1174                 case 2: /* erase whole display */
1175                         count = vc->vc_cols * vc->vc_rows;
1176                         start = (unsigned short *)vc->vc_origin;
1177                         if (DO_UPDATE(vc))
1178                                 vc->vc_sw->con_clear(vc, 0, 0,
1179                                               vc->vc_rows,
1180                                               vc->vc_cols);
1181                         break;
1182                 default:
1183                         return;
1184         }
1185         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1186         vc->vc_need_wrap = 0;
1187 }
1188
1189 static void csi_K(struct vc_data *vc, int vpar)
1190 {
1191         unsigned int count;
1192         unsigned short * start;
1193
1194         switch (vpar) {
1195                 case 0: /* erase from cursor to end of line */
1196                         count = vc->vc_cols - vc->vc_x;
1197                         start = (unsigned short *)vc->vc_pos;
1198                         if (DO_UPDATE(vc))
1199                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1200                                                      vc->vc_cols - vc->vc_x);
1201                         break;
1202                 case 1: /* erase from start of line to cursor */
1203                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1204                         count = vc->vc_x + 1;
1205                         if (DO_UPDATE(vc))
1206                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1207                                                      vc->vc_x + 1);
1208                         break;
1209                 case 2: /* erase whole line */
1210                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1211                         count = vc->vc_cols;
1212                         if (DO_UPDATE(vc))
1213                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1214                                               vc->vc_cols);
1215                         break;
1216                 default:
1217                         return;
1218         }
1219         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1220         vc->vc_need_wrap = 0;
1221 }
1222
1223 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1224 {                                         /* not vt100? */
1225         int count;
1226
1227         if (!vpar)
1228                 vpar++;
1229         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1230
1231         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1232         if (DO_UPDATE(vc))
1233                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1234         vc->vc_need_wrap = 0;
1235 }
1236
1237 static void default_attr(struct vc_data *vc)
1238 {
1239         vc->vc_intensity = 1;
1240         vc->vc_italic = 0;
1241         vc->vc_underline = 0;
1242         vc->vc_reverse = 0;
1243         vc->vc_blink = 0;
1244         vc->vc_color = vc->vc_def_color;
1245 }
1246
1247 /* console_sem is held */
1248 static void csi_m(struct vc_data *vc)
1249 {
1250         int i;
1251
1252         for (i = 0; i <= vc->vc_npar; i++)
1253                 switch (vc->vc_par[i]) {
1254                         case 0: /* all attributes off */
1255                                 default_attr(vc);
1256                                 break;
1257                         case 1:
1258                                 vc->vc_intensity = 2;
1259                                 break;
1260                         case 2:
1261                                 vc->vc_intensity = 0;
1262                                 break;
1263                         case 3:
1264                                 vc->vc_italic = 1;
1265                                 break;
1266                         case 4:
1267                                 vc->vc_underline = 1;
1268                                 break;
1269                         case 5:
1270                                 vc->vc_blink = 1;
1271                                 break;
1272                         case 7:
1273                                 vc->vc_reverse = 1;
1274                                 break;
1275                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1276                                   * Select primary font, don't display
1277                                   * control chars if defined, don't set
1278                                   * bit 8 on output.
1279                                   */
1280                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1281                                                 ? vc->vc_G0_charset
1282                                                 : vc->vc_G1_charset, vc);
1283                                 vc->vc_disp_ctrl = 0;
1284                                 vc->vc_toggle_meta = 0;
1285                                 break;
1286                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1287                                   * Select first alternate font, lets
1288                                   * chars < 32 be displayed as ROM chars.
1289                                   */
1290                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1291                                 vc->vc_disp_ctrl = 1;
1292                                 vc->vc_toggle_meta = 0;
1293                                 break;
1294                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1295                                   * Select second alternate font, toggle
1296                                   * high bit before displaying as ROM char.
1297                                   */
1298                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1299                                 vc->vc_disp_ctrl = 1;
1300                                 vc->vc_toggle_meta = 1;
1301                                 break;
1302                         case 21:
1303                         case 22:
1304                                 vc->vc_intensity = 1;
1305                                 break;
1306                         case 23:
1307                                 vc->vc_italic = 0;
1308                                 break;
1309                         case 24:
1310                                 vc->vc_underline = 0;
1311                                 break;
1312                         case 25:
1313                                 vc->vc_blink = 0;
1314                                 break;
1315                         case 27:
1316                                 vc->vc_reverse = 0;
1317                                 break;
1318                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1319                                   * Enables underscore, white foreground
1320                                   * with white underscore (Linux - use
1321                                   * default foreground).
1322                                   */
1323                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1324                                 vc->vc_underline = 1;
1325                                 break;
1326                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1327                                   * Disable underline option.
1328                                   * Reset colour to default? It did this
1329                                   * before...
1330                                   */
1331                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1332                                 vc->vc_underline = 0;
1333                                 break;
1334                         case 49:
1335                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1336                                 break;
1337                         default:
1338                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1339                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1340                                                 | (vc->vc_color & 0xf0);
1341                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1342                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1343                                                 | (vc->vc_color & 0x0f);
1344                                 break;
1345                 }
1346         update_attr(vc);
1347 }
1348
1349 static void respond_string(const char *p, struct tty_struct *tty)
1350 {
1351         while (*p) {
1352                 tty_insert_flip_char(tty, *p, 0);
1353                 p++;
1354         }
1355         con_schedule_flip(tty);
1356 }
1357
1358 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1359 {
1360         char buf[40];
1361
1362         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1363         respond_string(buf, tty);
1364 }
1365
1366 static inline void status_report(struct tty_struct *tty)
1367 {
1368         respond_string("\033[0n", tty); /* Terminal ok */
1369 }
1370
1371 static inline void respond_ID(struct tty_struct * tty)
1372 {
1373         respond_string(VT102ID, tty);
1374 }
1375
1376 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1377 {
1378         char buf[8];
1379
1380         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1381                 (char)('!' + mry));
1382         respond_string(buf, tty);
1383 }
1384
1385 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1386 int mouse_reporting(void)
1387 {
1388         return vc_cons[fg_console].d->vc_report_mouse;
1389 }
1390
1391 /* console_sem is held */
1392 static void set_mode(struct vc_data *vc, int on_off)
1393 {
1394         int i;
1395
1396         for (i = 0; i <= vc->vc_npar; i++)
1397                 if (vc->vc_ques) {
1398                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1399                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1400                                 if (on_off)
1401                                         set_kbd(vc, decckm);
1402                                 else
1403                                         clr_kbd(vc, decckm);
1404                                 break;
1405                         case 3: /* 80/132 mode switch unimplemented */
1406                                 vc->vc_deccolm = on_off;
1407 #if 0
1408                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1409                                 /* this alone does not suffice; some user mode
1410                                    utility has to change the hardware regs */
1411 #endif
1412                                 break;
1413                         case 5:                 /* Inverted screen on/off */
1414                                 if (vc->vc_decscnm != on_off) {
1415                                         vc->vc_decscnm = on_off;
1416                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1417                                         update_attr(vc);
1418                                 }
1419                                 break;
1420                         case 6:                 /* Origin relative/absolute */
1421                                 vc->vc_decom = on_off;
1422                                 gotoxay(vc, 0, 0);
1423                                 break;
1424                         case 7:                 /* Autowrap on/off */
1425                                 vc->vc_decawm = on_off;
1426                                 break;
1427                         case 8:                 /* Autorepeat on/off */
1428                                 if (on_off)
1429                                         set_kbd(vc, decarm);
1430                                 else
1431                                         clr_kbd(vc, decarm);
1432                                 break;
1433                         case 9:
1434                                 vc->vc_report_mouse = on_off ? 1 : 0;
1435                                 break;
1436                         case 25:                /* Cursor on/off */
1437                                 vc->vc_deccm = on_off;
1438                                 break;
1439                         case 1000:
1440                                 vc->vc_report_mouse = on_off ? 2 : 0;
1441                                 break;
1442                         }
1443                 } else {
1444                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1445                         case 3:                 /* Monitor (display ctrls) */
1446                                 vc->vc_disp_ctrl = on_off;
1447                                 break;
1448                         case 4:                 /* Insert Mode on/off */
1449                                 vc->vc_decim = on_off;
1450                                 break;
1451                         case 20:                /* Lf, Enter == CrLf/Lf */
1452                                 if (on_off)
1453                                         set_kbd(vc, lnm);
1454                                 else
1455                                         clr_kbd(vc, lnm);
1456                                 break;
1457                         }
1458                 }
1459 }
1460
1461 /* console_sem is held */
1462 static void setterm_command(struct vc_data *vc)
1463 {
1464         switch(vc->vc_par[0]) {
1465                 case 1: /* set color for underline mode */
1466                         if (vc->vc_can_do_color &&
1467                                         vc->vc_par[1] < 16) {
1468                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1469                                 if (vc->vc_underline)
1470                                         update_attr(vc);
1471                         }
1472                         break;
1473                 case 2: /* set color for half intensity mode */
1474                         if (vc->vc_can_do_color &&
1475                                         vc->vc_par[1] < 16) {
1476                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1477                                 if (vc->vc_intensity == 0)
1478                                         update_attr(vc);
1479                         }
1480                         break;
1481                 case 8: /* store colors as defaults */
1482                         vc->vc_def_color = vc->vc_attr;
1483                         if (vc->vc_hi_font_mask == 0x100)
1484                                 vc->vc_def_color >>= 1;
1485                         default_attr(vc);
1486                         update_attr(vc);
1487                         break;
1488                 case 9: /* set blanking interval */
1489                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1490                         poke_blanked_console();
1491                         break;
1492                 case 10: /* set bell frequency in Hz */
1493                         if (vc->vc_npar >= 1)
1494                                 vc->vc_bell_pitch = vc->vc_par[1];
1495                         else
1496                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1497                         break;
1498                 case 11: /* set bell duration in msec */
1499                         if (vc->vc_npar >= 1)
1500                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1501                                         vc->vc_par[1] * HZ / 1000 : 0;
1502                         else
1503                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1504                         break;
1505                 case 12: /* bring specified console to the front */
1506                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1507                                 set_console(vc->vc_par[1] - 1);
1508                         break;
1509                 case 13: /* unblank the screen */
1510                         poke_blanked_console();
1511                         break;
1512                 case 14: /* set vesa powerdown interval */
1513                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1514                         break;
1515                 case 15: /* activate the previous console */
1516                         set_console(last_console);
1517                         break;
1518         }
1519 }
1520
1521 /* console_sem is held */
1522 static void csi_at(struct vc_data *vc, unsigned int nr)
1523 {
1524         if (nr > vc->vc_cols - vc->vc_x)
1525                 nr = vc->vc_cols - vc->vc_x;
1526         else if (!nr)
1527                 nr = 1;
1528         insert_char(vc, nr);
1529 }
1530
1531 /* console_sem is held */
1532 static void csi_L(struct vc_data *vc, unsigned int nr)
1533 {
1534         if (nr > vc->vc_rows - vc->vc_y)
1535                 nr = vc->vc_rows - vc->vc_y;
1536         else if (!nr)
1537                 nr = 1;
1538         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1539         vc->vc_need_wrap = 0;
1540 }
1541
1542 /* console_sem is held */
1543 static void csi_P(struct vc_data *vc, unsigned int nr)
1544 {
1545         if (nr > vc->vc_cols - vc->vc_x)
1546                 nr = vc->vc_cols - vc->vc_x;
1547         else if (!nr)
1548                 nr = 1;
1549         delete_char(vc, nr);
1550 }
1551
1552 /* console_sem is held */
1553 static void csi_M(struct vc_data *vc, unsigned int nr)
1554 {
1555         if (nr > vc->vc_rows - vc->vc_y)
1556                 nr = vc->vc_rows - vc->vc_y;
1557         else if (!nr)
1558                 nr=1;
1559         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1560         vc->vc_need_wrap = 0;
1561 }
1562
1563 /* console_sem is held (except via vc_init->reset_terminal */
1564 static void save_cur(struct vc_data *vc)
1565 {
1566         vc->vc_saved_x          = vc->vc_x;
1567         vc->vc_saved_y          = vc->vc_y;
1568         vc->vc_s_intensity      = vc->vc_intensity;
1569         vc->vc_s_italic         = vc->vc_italic;
1570         vc->vc_s_underline      = vc->vc_underline;
1571         vc->vc_s_blink          = vc->vc_blink;
1572         vc->vc_s_reverse        = vc->vc_reverse;
1573         vc->vc_s_charset        = vc->vc_charset;
1574         vc->vc_s_color          = vc->vc_color;
1575         vc->vc_saved_G0         = vc->vc_G0_charset;
1576         vc->vc_saved_G1         = vc->vc_G1_charset;
1577 }
1578
1579 /* console_sem is held */
1580 static void restore_cur(struct vc_data *vc)
1581 {
1582         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1583         vc->vc_intensity        = vc->vc_s_intensity;
1584         vc->vc_italic           = vc->vc_s_italic;
1585         vc->vc_underline        = vc->vc_s_underline;
1586         vc->vc_blink            = vc->vc_s_blink;
1587         vc->vc_reverse          = vc->vc_s_reverse;
1588         vc->vc_charset          = vc->vc_s_charset;
1589         vc->vc_color            = vc->vc_s_color;
1590         vc->vc_G0_charset       = vc->vc_saved_G0;
1591         vc->vc_G1_charset       = vc->vc_saved_G1;
1592         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1593         update_attr(vc);
1594         vc->vc_need_wrap = 0;
1595 }
1596
1597 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1598         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1599         ESpalette };
1600
1601 /* console_sem is held (except via vc_init()) */
1602 static void reset_terminal(struct vc_data *vc, int do_clear)
1603 {
1604         vc->vc_top              = 0;
1605         vc->vc_bottom           = vc->vc_rows;
1606         vc->vc_state            = ESnormal;
1607         vc->vc_ques             = 0;
1608         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1609         vc->vc_G0_charset       = LAT1_MAP;
1610         vc->vc_G1_charset       = GRAF_MAP;
1611         vc->vc_charset          = 0;
1612         vc->vc_need_wrap        = 0;
1613         vc->vc_report_mouse     = 0;
1614         vc->vc_utf              = default_utf8;
1615         vc->vc_utf_count        = 0;
1616
1617         vc->vc_disp_ctrl        = 0;
1618         vc->vc_toggle_meta      = 0;
1619
1620         vc->vc_decscnm          = 0;
1621         vc->vc_decom            = 0;
1622         vc->vc_decawm           = 1;
1623         vc->vc_deccm            = 1;
1624         vc->vc_decim            = 0;
1625
1626         set_kbd(vc, decarm);
1627         clr_kbd(vc, decckm);
1628         clr_kbd(vc, kbdapplic);
1629         clr_kbd(vc, lnm);
1630         kbd_table[vc->vc_num].lockstate = 0;
1631         kbd_table[vc->vc_num].slockstate = 0;
1632         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1633         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1634         /* do not do set_leds here because this causes an endless tasklet loop
1635            when the keyboard hasn't been initialized yet */
1636
1637         vc->vc_cursor_type = CUR_DEFAULT;
1638         vc->vc_complement_mask = vc->vc_s_complement_mask;
1639
1640         default_attr(vc);
1641         update_attr(vc);
1642
1643         vc->vc_tab_stop[0]      = 0x01010100;
1644         vc->vc_tab_stop[1]      =
1645         vc->vc_tab_stop[2]      =
1646         vc->vc_tab_stop[3]      =
1647         vc->vc_tab_stop[4]      =
1648         vc->vc_tab_stop[5]      =
1649         vc->vc_tab_stop[6]      =
1650         vc->vc_tab_stop[7]      = 0x01010101;
1651
1652         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1653         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1654
1655         gotoxy(vc, 0, 0);
1656         save_cur(vc);
1657         if (do_clear)
1658             csi_J(vc, 2);
1659 }
1660
1661 /* console_sem is held */
1662 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1663 {
1664         /*
1665          *  Control characters can be used in the _middle_
1666          *  of an escape sequence.
1667          */
1668         switch (c) {
1669         case 0:
1670                 return;
1671         case 7:
1672                 if (vc->vc_bell_duration)
1673                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1674                 return;
1675         case 8:
1676                 bs(vc);
1677                 return;
1678         case 9:
1679                 vc->vc_pos -= (vc->vc_x << 1);
1680                 while (vc->vc_x < vc->vc_cols - 1) {
1681                         vc->vc_x++;
1682                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1683                                 break;
1684                 }
1685                 vc->vc_pos += (vc->vc_x << 1);
1686                 notify_write(vc, '\t');
1687                 return;
1688         case 10: case 11: case 12:
1689                 lf(vc);
1690                 if (!is_kbd(vc, lnm))
1691                         return;
1692         case 13:
1693                 cr(vc);
1694                 return;
1695         case 14:
1696                 vc->vc_charset = 1;
1697                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1698                 vc->vc_disp_ctrl = 1;
1699                 return;
1700         case 15:
1701                 vc->vc_charset = 0;
1702                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1703                 vc->vc_disp_ctrl = 0;
1704                 return;
1705         case 24: case 26:
1706                 vc->vc_state = ESnormal;
1707                 return;
1708         case 27:
1709                 vc->vc_state = ESesc;
1710                 return;
1711         case 127:
1712                 del(vc);
1713                 return;
1714         case 128+27:
1715                 vc->vc_state = ESsquare;
1716                 return;
1717         }
1718         switch(vc->vc_state) {
1719         case ESesc:
1720                 vc->vc_state = ESnormal;
1721                 switch (c) {
1722                 case '[':
1723                         vc->vc_state = ESsquare;
1724                         return;
1725                 case ']':
1726                         vc->vc_state = ESnonstd;
1727                         return;
1728                 case '%':
1729                         vc->vc_state = ESpercent;
1730                         return;
1731                 case 'E':
1732                         cr(vc);
1733                         lf(vc);
1734                         return;
1735                 case 'M':
1736                         ri(vc);
1737                         return;
1738                 case 'D':
1739                         lf(vc);
1740                         return;
1741                 case 'H':
1742                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1743                         return;
1744                 case 'Z':
1745                         respond_ID(tty);
1746                         return;
1747                 case '7':
1748                         save_cur(vc);
1749                         return;
1750                 case '8':
1751                         restore_cur(vc);
1752                         return;
1753                 case '(':
1754                         vc->vc_state = ESsetG0;
1755                         return;
1756                 case ')':
1757                         vc->vc_state = ESsetG1;
1758                         return;
1759                 case '#':
1760                         vc->vc_state = EShash;
1761                         return;
1762                 case 'c':
1763                         reset_terminal(vc, 1);
1764                         return;
1765                 case '>':  /* Numeric keypad */
1766                         clr_kbd(vc, kbdapplic);
1767                         return;
1768                 case '=':  /* Appl. keypad */
1769                         set_kbd(vc, kbdapplic);
1770                         return;
1771                 }
1772                 return;
1773         case ESnonstd:
1774                 if (c=='P') {   /* palette escape sequence */
1775                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1776                                 vc->vc_par[vc->vc_npar] = 0;
1777                         vc->vc_npar = 0;
1778                         vc->vc_state = ESpalette;
1779                         return;
1780                 } else if (c=='R') {   /* reset palette */
1781                         reset_palette(vc);
1782                         vc->vc_state = ESnormal;
1783                 } else
1784                         vc->vc_state = ESnormal;
1785                 return;
1786         case ESpalette:
1787                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1788                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1789                         if (vc->vc_npar == 7) {
1790                                 int i = vc->vc_par[0] * 3, j = 1;
1791                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1792                                 vc->vc_palette[i++] += vc->vc_par[j++];
1793                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1794                                 vc->vc_palette[i++] += vc->vc_par[j++];
1795                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1796                                 vc->vc_palette[i] += vc->vc_par[j];
1797                                 set_palette(vc);
1798                                 vc->vc_state = ESnormal;
1799                         }
1800                 } else
1801                         vc->vc_state = ESnormal;
1802                 return;
1803         case ESsquare:
1804                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1805                         vc->vc_par[vc->vc_npar] = 0;
1806                 vc->vc_npar = 0;
1807                 vc->vc_state = ESgetpars;
1808                 if (c == '[') { /* Function key */
1809                         vc->vc_state=ESfunckey;
1810                         return;
1811                 }
1812                 vc->vc_ques = (c == '?');
1813                 if (vc->vc_ques)
1814                         return;
1815         case ESgetpars:
1816                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1817                         vc->vc_npar++;
1818                         return;
1819                 } else if (c>='0' && c<='9') {
1820                         vc->vc_par[vc->vc_npar] *= 10;
1821                         vc->vc_par[vc->vc_npar] += c - '0';
1822                         return;
1823                 } else
1824                         vc->vc_state = ESgotpars;
1825         case ESgotpars:
1826                 vc->vc_state = ESnormal;
1827                 switch(c) {
1828                 case 'h':
1829                         set_mode(vc, 1);
1830                         return;
1831                 case 'l':
1832                         set_mode(vc, 0);
1833                         return;
1834                 case 'c':
1835                         if (vc->vc_ques) {
1836                                 if (vc->vc_par[0])
1837                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1838                                 else
1839                                         vc->vc_cursor_type = CUR_DEFAULT;
1840                                 return;
1841                         }
1842                         break;
1843                 case 'm':
1844                         if (vc->vc_ques) {
1845                                 clear_selection();
1846                                 if (vc->vc_par[0])
1847                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1848                                 else
1849                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1850                                 return;
1851                         }
1852                         break;
1853                 case 'n':
1854                         if (!vc->vc_ques) {
1855                                 if (vc->vc_par[0] == 5)
1856                                         status_report(tty);
1857                                 else if (vc->vc_par[0] == 6)
1858                                         cursor_report(vc, tty);
1859                         }
1860                         return;
1861                 }
1862                 if (vc->vc_ques) {
1863                         vc->vc_ques = 0;
1864                         return;
1865                 }
1866                 switch(c) {
1867                 case 'G': case '`':
1868                         if (vc->vc_par[0])
1869                                 vc->vc_par[0]--;
1870                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1871                         return;
1872                 case 'A':
1873                         if (!vc->vc_par[0])
1874                                 vc->vc_par[0]++;
1875                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1876                         return;
1877                 case 'B': case 'e':
1878                         if (!vc->vc_par[0])
1879                                 vc->vc_par[0]++;
1880                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1881                         return;
1882                 case 'C': case 'a':
1883                         if (!vc->vc_par[0])
1884                                 vc->vc_par[0]++;
1885                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1886                         return;
1887                 case 'D':
1888                         if (!vc->vc_par[0])
1889                                 vc->vc_par[0]++;
1890                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1891                         return;
1892                 case 'E':
1893                         if (!vc->vc_par[0])
1894                                 vc->vc_par[0]++;
1895                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1896                         return;
1897                 case 'F':
1898                         if (!vc->vc_par[0])
1899                                 vc->vc_par[0]++;
1900                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1901                         return;
1902                 case 'd':
1903                         if (vc->vc_par[0])
1904                                 vc->vc_par[0]--;
1905                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1906                         return;
1907                 case 'H': case 'f':
1908                         if (vc->vc_par[0])
1909                                 vc->vc_par[0]--;
1910                         if (vc->vc_par[1])
1911                                 vc->vc_par[1]--;
1912                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1913                         return;
1914                 case 'J':
1915                         csi_J(vc, vc->vc_par[0]);
1916                         return;
1917                 case 'K':
1918                         csi_K(vc, vc->vc_par[0]);
1919                         return;
1920                 case 'L':
1921                         csi_L(vc, vc->vc_par[0]);
1922                         return;
1923                 case 'M':
1924                         csi_M(vc, vc->vc_par[0]);
1925                         return;
1926                 case 'P':
1927                         csi_P(vc, vc->vc_par[0]);
1928                         return;
1929                 case 'c':
1930                         if (!vc->vc_par[0])
1931                                 respond_ID(tty);
1932                         return;
1933                 case 'g':
1934                         if (!vc->vc_par[0])
1935                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1936                         else if (vc->vc_par[0] == 3) {
1937                                 vc->vc_tab_stop[0] =
1938                                         vc->vc_tab_stop[1] =
1939                                         vc->vc_tab_stop[2] =
1940                                         vc->vc_tab_stop[3] =
1941                                         vc->vc_tab_stop[4] =
1942                                         vc->vc_tab_stop[5] =
1943                                         vc->vc_tab_stop[6] =
1944                                         vc->vc_tab_stop[7] = 0;
1945                         }
1946                         return;
1947                 case 'm':
1948                         csi_m(vc);
1949                         return;
1950                 case 'q': /* DECLL - but only 3 leds */
1951                         /* map 0,1,2,3 to 0,1,2,4 */
1952                         if (vc->vc_par[0] < 4)
1953                                 setledstate(kbd_table + vc->vc_num,
1954                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1955                         return;
1956                 case 'r':
1957                         if (!vc->vc_par[0])
1958                                 vc->vc_par[0]++;
1959                         if (!vc->vc_par[1])
1960                                 vc->vc_par[1] = vc->vc_rows;
1961                         /* Minimum allowed region is 2 lines */
1962                         if (vc->vc_par[0] < vc->vc_par[1] &&
1963                             vc->vc_par[1] <= vc->vc_rows) {
1964                                 vc->vc_top = vc->vc_par[0] - 1;
1965                                 vc->vc_bottom = vc->vc_par[1];
1966                                 gotoxay(vc, 0, 0);
1967                         }
1968                         return;
1969                 case 's':
1970                         save_cur(vc);
1971                         return;
1972                 case 'u':
1973                         restore_cur(vc);
1974                         return;
1975                 case 'X':
1976                         csi_X(vc, vc->vc_par[0]);
1977                         return;
1978                 case '@':
1979                         csi_at(vc, vc->vc_par[0]);
1980                         return;
1981                 case ']': /* setterm functions */
1982                         setterm_command(vc);
1983                         return;
1984                 }
1985                 return;
1986         case ESpercent:
1987                 vc->vc_state = ESnormal;
1988                 switch (c) {
1989                 case '@':  /* defined in ISO 2022 */
1990                         vc->vc_utf = 0;
1991                         return;
1992                 case 'G':  /* prelim official escape code */
1993                 case '8':  /* retained for compatibility */
1994                         vc->vc_utf = 1;
1995                         return;
1996                 }
1997                 return;
1998         case ESfunckey:
1999                 vc->vc_state = ESnormal;
2000                 return;
2001         case EShash:
2002                 vc->vc_state = ESnormal;
2003                 if (c == '8') {
2004                         /* DEC screen alignment test. kludge :-) */
2005                         vc->vc_video_erase_char =
2006                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2007                         csi_J(vc, 2);
2008                         vc->vc_video_erase_char =
2009                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2010                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2011                 }
2012                 return;
2013         case ESsetG0:
2014                 if (c == '0')
2015                         vc->vc_G0_charset = GRAF_MAP;
2016                 else if (c == 'B')
2017                         vc->vc_G0_charset = LAT1_MAP;
2018                 else if (c == 'U')
2019                         vc->vc_G0_charset = IBMPC_MAP;
2020                 else if (c == 'K')
2021                         vc->vc_G0_charset = USER_MAP;
2022                 if (vc->vc_charset == 0)
2023                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2024                 vc->vc_state = ESnormal;
2025                 return;
2026         case ESsetG1:
2027                 if (c == '0')
2028                         vc->vc_G1_charset = GRAF_MAP;
2029                 else if (c == 'B')
2030                         vc->vc_G1_charset = LAT1_MAP;
2031                 else if (c == 'U')
2032                         vc->vc_G1_charset = IBMPC_MAP;
2033                 else if (c == 'K')
2034                         vc->vc_G1_charset = USER_MAP;
2035                 if (vc->vc_charset == 1)
2036                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2037                 vc->vc_state = ESnormal;
2038                 return;
2039         default:
2040                 vc->vc_state = ESnormal;
2041         }
2042 }
2043
2044 /* This is a temporary buffer used to prepare a tty console write
2045  * so that we can easily avoid touching user space while holding the
2046  * console spinlock.  It is allocated in con_init and is shared by
2047  * this code and the vc_screen read/write tty calls.
2048  *
2049  * We have to allocate this statically in the kernel data section
2050  * since console_init (and thus con_init) are called before any
2051  * kernel memory allocation is available.
2052  */
2053 char con_buf[CON_BUF_SIZE];
2054 DEFINE_MUTEX(con_buf_mtx);
2055
2056 /* is_double_width() is based on the wcwidth() implementation by
2057  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2058  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2059  */
2060 struct interval {
2061         uint32_t first;
2062         uint32_t last;
2063 };
2064
2065 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2066 {
2067         int min = 0;
2068         int mid;
2069
2070         if (ucs < table[0].first || ucs > table[max].last)
2071                 return 0;
2072         while (max >= min) {
2073                 mid = (min + max) / 2;
2074                 if (ucs > table[mid].last)
2075                         min = mid + 1;
2076                 else if (ucs < table[mid].first)
2077                         max = mid - 1;
2078                 else
2079                         return 1;
2080         }
2081         return 0;
2082 }
2083
2084 static int is_double_width(uint32_t ucs)
2085 {
2086         static const struct interval double_width[] = {
2087                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2088                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2089                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2090                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2091         };
2092         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2093 }
2094
2095 /* acquires console_sem */
2096 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2097 {
2098 #ifdef VT_BUF_VRAM_ONLY
2099 #define FLUSH do { } while(0);
2100 #else
2101 #define FLUSH if (draw_x >= 0) { \
2102         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2103         draw_x = -1; \
2104         }
2105 #endif
2106
2107         int c, tc, ok, n = 0, draw_x = -1;
2108         unsigned int currcons;
2109         unsigned long draw_from = 0, draw_to = 0;
2110         struct vc_data *vc;
2111         unsigned char vc_attr;
2112         struct vt_notifier_param param;
2113         uint8_t rescan;
2114         uint8_t inverse;
2115         uint8_t width;
2116         u16 himask, charmask;
2117         const unsigned char *orig_buf = NULL;
2118         int orig_count;
2119
2120         if (in_interrupt())
2121                 return count;
2122
2123         might_sleep();
2124
2125         acquire_console_sem();
2126         vc = tty->driver_data;
2127         if (vc == NULL) {
2128                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2129                 release_console_sem();
2130                 return 0;
2131         }
2132
2133         currcons = vc->vc_num;
2134         if (!vc_cons_allocated(currcons)) {
2135             /* could this happen? */
2136             static int error = 0;
2137             if (!error) {
2138                 error = 1;
2139                 printk("con_write: tty %d not allocated\n", currcons+1);
2140             }
2141             release_console_sem();
2142             return 0;
2143         }
2144         orig_buf = buf;
2145         orig_count = count;
2146
2147         himask = vc->vc_hi_font_mask;
2148         charmask = himask ? 0x1ff : 0xff;
2149
2150         /* undraw cursor first */
2151         if (IS_FG(vc))
2152                 hide_cursor(vc);
2153
2154         param.vc = vc;
2155
2156         while (!tty->stopped && count) {
2157                 int orig = *buf;
2158                 c = orig;
2159                 buf++;
2160                 n++;
2161                 count--;
2162                 rescan = 0;
2163                 inverse = 0;
2164                 width = 1;
2165
2166                 /* Do no translation at all in control states */
2167                 if (vc->vc_state != ESnormal) {
2168                         tc = c;
2169                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2170                     /* Combine UTF-8 into Unicode in vc_utf_char.
2171                      * vc_utf_count is the number of continuation bytes still
2172                      * expected to arrive.
2173                      * vc_npar is the number of continuation bytes arrived so
2174                      * far
2175                      */
2176 rescan_last_byte:
2177                     if ((c & 0xc0) == 0x80) {
2178                         /* Continuation byte received */
2179                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2180                         if (vc->vc_utf_count) {
2181                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2182                             vc->vc_npar++;
2183                             if (--vc->vc_utf_count) {
2184                                 /* Still need some bytes */
2185                                 continue;
2186                             }
2187                             /* Got a whole character */
2188                             c = vc->vc_utf_char;
2189                             /* Reject overlong sequences */
2190                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2191                                         c > utf8_length_changes[vc->vc_npar])
2192                                 c = 0xfffd;
2193                         } else {
2194                             /* Unexpected continuation byte */
2195                             vc->vc_utf_count = 0;
2196                             c = 0xfffd;
2197                         }
2198                     } else {
2199                         /* Single ASCII byte or first byte of a sequence received */
2200                         if (vc->vc_utf_count) {
2201                             /* Continuation byte expected */
2202                             rescan = 1;
2203                             vc->vc_utf_count = 0;
2204                             c = 0xfffd;
2205                         } else if (c > 0x7f) {
2206                             /* First byte of a multibyte sequence received */
2207                             vc->vc_npar = 0;
2208                             if ((c & 0xe0) == 0xc0) {
2209                                 vc->vc_utf_count = 1;
2210                                 vc->vc_utf_char = (c & 0x1f);
2211                             } else if ((c & 0xf0) == 0xe0) {
2212                                 vc->vc_utf_count = 2;
2213                                 vc->vc_utf_char = (c & 0x0f);
2214                             } else if ((c & 0xf8) == 0xf0) {
2215                                 vc->vc_utf_count = 3;
2216                                 vc->vc_utf_char = (c & 0x07);
2217                             } else if ((c & 0xfc) == 0xf8) {
2218                                 vc->vc_utf_count = 4;
2219                                 vc->vc_utf_char = (c & 0x03);
2220                             } else if ((c & 0xfe) == 0xfc) {
2221                                 vc->vc_utf_count = 5;
2222                                 vc->vc_utf_char = (c & 0x01);
2223                             } else {
2224                                 /* 254 and 255 are invalid */
2225                                 c = 0xfffd;
2226                             }
2227                             if (vc->vc_utf_count) {
2228                                 /* Still need some bytes */
2229                                 continue;
2230                             }
2231                         }
2232                         /* Nothing to do if an ASCII byte was received */
2233                     }
2234                     /* End of UTF-8 decoding. */
2235                     /* c is the received character, or U+FFFD for invalid sequences. */
2236                     /* Replace invalid Unicode code points with U+FFFD too */
2237                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2238                         c = 0xfffd;
2239                     tc = c;
2240                 } else {        /* no utf or alternate charset mode */
2241                     tc = vc_translate(vc, c);
2242                 }
2243
2244                 param.c = tc;
2245                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2246                                         &param) == NOTIFY_STOP)
2247                         continue;
2248
2249                 /* If the original code was a control character we
2250                  * only allow a glyph to be displayed if the code is
2251                  * not normally used (such as for cursor movement) or
2252                  * if the disp_ctrl mode has been explicitly enabled.
2253                  * Certain characters (as given by the CTRL_ALWAYS
2254                  * bitmap) are always displayed as control characters,
2255                  * as the console would be pretty useless without
2256                  * them; to display an arbitrary font position use the
2257                  * direct-to-font zone in UTF-8 mode.
2258                  */
2259                 ok = tc && (c >= 32 ||
2260                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2261                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2262                         && (c != 127 || vc->vc_disp_ctrl)
2263                         && (c != 128+27);
2264
2265                 if (vc->vc_state == ESnormal && ok) {
2266                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2267                                 if (is_double_width(c))
2268                                         width = 2;
2269                         }
2270                         /* Now try to find out how to display it */
2271                         tc = conv_uni_to_pc(vc, tc);
2272                         if (tc & ~charmask) {
2273                                 if (tc == -1 || tc == -2) {
2274                                     continue; /* nothing to display */
2275                                 }
2276                                 /* Glyph not found */
2277                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2278                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2279                                        This would make absolutely no sense with Unicode in mind,
2280                                        but do this for ASCII characters since a font may lack
2281                                        Unicode mapping info and we don't want to end up with
2282                                        having question marks only. */
2283                                     tc = c;
2284                                 } else {
2285                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2286                                     tc = conv_uni_to_pc(vc, 0xfffd);
2287                                     if (tc < 0) {
2288                                         inverse = 1;
2289                                         tc = conv_uni_to_pc(vc, '?');
2290                                         if (tc < 0) tc = '?';
2291                                     }
2292                                 }
2293                         }
2294
2295                         if (!inverse) {
2296                                 vc_attr = vc->vc_attr;
2297                         } else {
2298                                 /* invert vc_attr */
2299                                 if (!vc->vc_can_do_color) {
2300                                         vc_attr = (vc->vc_attr) ^ 0x08;
2301                                 } else if (vc->vc_hi_font_mask == 0x100) {
2302                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2303                                 } else {
2304                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2305                                 }
2306                                 FLUSH
2307                         }
2308
2309                         while (1) {
2310                                 if (vc->vc_need_wrap || vc->vc_decim)
2311                                         FLUSH
2312                                 if (vc->vc_need_wrap) {
2313                                         cr(vc);
2314                                         lf(vc);
2315                                 }
2316                                 if (vc->vc_decim)
2317                                         insert_char(vc, 1);
2318                                 scr_writew(himask ?
2319                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2320                                              (vc_attr << 8) + tc,
2321                                            (u16 *) vc->vc_pos);
2322                                 if (DO_UPDATE(vc) && draw_x < 0) {
2323                                         draw_x = vc->vc_x;
2324                                         draw_from = vc->vc_pos;
2325                                 }
2326                                 if (vc->vc_x == vc->vc_cols - 1) {
2327                                         vc->vc_need_wrap = vc->vc_decawm;
2328                                         draw_to = vc->vc_pos + 2;
2329                                 } else {
2330                                         vc->vc_x++;
2331                                         draw_to = (vc->vc_pos += 2);
2332                                 }
2333
2334                                 if (!--width) break;
2335
2336                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2337                                 if (tc < 0) tc = ' ';
2338                         }
2339                         notify_write(vc, c);
2340
2341                         if (inverse) {
2342                                 FLUSH
2343                         }
2344
2345                         if (rescan) {
2346                                 rescan = 0;
2347                                 inverse = 0;
2348                                 width = 1;
2349                                 c = orig;
2350                                 goto rescan_last_byte;
2351                         }
2352                         continue;
2353                 }
2354                 FLUSH
2355                 do_con_trol(tty, vc, orig);
2356         }
2357         FLUSH
2358         console_conditional_schedule();
2359         release_console_sem();
2360         notify_update(vc);
2361         return n;
2362 #undef FLUSH
2363 }
2364
2365 /*
2366  * This is the console switching callback.
2367  *
2368  * Doing console switching in a process context allows
2369  * us to do the switches asynchronously (needed when we want
2370  * to switch due to a keyboard interrupt).  Synchronization
2371  * with other console code and prevention of re-entrancy is
2372  * ensured with console_sem.
2373  */
2374 static void console_callback(struct work_struct *ignored)
2375 {
2376         acquire_console_sem();
2377
2378         if (want_console >= 0) {
2379                 if (want_console != fg_console &&
2380                     vc_cons_allocated(want_console)) {
2381                         hide_cursor(vc_cons[fg_console].d);
2382                         change_console(vc_cons[want_console].d);
2383                         /* we only changed when the console had already
2384                            been allocated - a new console is not created
2385                            in an interrupt routine */
2386                 }
2387                 want_console = -1;
2388         }
2389         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2390                 do_poke_blanked_console = 0;
2391                 poke_blanked_console();
2392         }
2393         if (scrollback_delta) {
2394                 struct vc_data *vc = vc_cons[fg_console].d;
2395                 clear_selection();
2396                 if (vc->vc_mode == KD_TEXT)
2397                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2398                 scrollback_delta = 0;
2399         }
2400         if (blank_timer_expired) {
2401                 do_blank_screen(0);
2402                 blank_timer_expired = 0;
2403         }
2404         notify_update(vc_cons[fg_console].d);
2405
2406         release_console_sem();
2407 }
2408
2409 int set_console(int nr)
2410 {
2411         struct vc_data *vc = vc_cons[fg_console].d;
2412
2413         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2414                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2415
2416                 /*
2417                  * Console switch will fail in console_callback() or
2418                  * change_console() so there is no point scheduling
2419                  * the callback
2420                  *
2421                  * Existing set_console() users don't check the return
2422                  * value so this shouldn't break anything
2423                  */
2424                 return -EINVAL;
2425         }
2426
2427         want_console = nr;
2428         schedule_console_callback();
2429
2430         return 0;
2431 }
2432
2433 struct tty_driver *console_driver;
2434
2435 #ifdef CONFIG_VT_CONSOLE
2436
2437 /*
2438  *      Console on virtual terminal
2439  *
2440  * The console must be locked when we get here.
2441  */
2442
2443 static void vt_console_print(struct console *co, const char *b, unsigned count)
2444 {
2445         struct vc_data *vc = vc_cons[fg_console].d;
2446         unsigned char c;
2447         static DEFINE_SPINLOCK(printing_lock);
2448         const ushort *start;
2449         ushort cnt = 0;
2450         ushort myx;
2451
2452         /* console busy or not yet initialized */
2453         if (!printable)
2454                 return;
2455         if (!spin_trylock(&printing_lock))
2456                 return;
2457
2458         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2459                 vc = vc_cons[kmsg_redirect - 1].d;
2460
2461         /* read `x' only after setting currcons properly (otherwise
2462            the `x' macro will read the x of the foreground console). */
2463         myx = vc->vc_x;
2464
2465         if (!vc_cons_allocated(fg_console)) {
2466                 /* impossible */
2467                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2468                 goto quit;
2469         }
2470
2471         if (vc->vc_mode != KD_TEXT)
2472                 goto quit;
2473
2474         /* undraw cursor first */
2475         if (IS_FG(vc))
2476                 hide_cursor(vc);
2477
2478         start = (ushort *)vc->vc_pos;
2479
2480         /* Contrived structure to try to emulate original need_wrap behaviour
2481          * Problems caused when we have need_wrap set on '\n' character */
2482         while (count--) {
2483                 c = *b++;
2484                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2485                         if (cnt > 0) {
2486                                 if (CON_IS_VISIBLE(vc))
2487                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2488                                 vc->vc_x += cnt;
2489                                 if (vc->vc_need_wrap)
2490                                         vc->vc_x--;
2491                                 cnt = 0;
2492                         }
2493                         if (c == 8) {           /* backspace */
2494                                 bs(vc);
2495                                 start = (ushort *)vc->vc_pos;
2496                                 myx = vc->vc_x;
2497                                 continue;
2498                         }
2499                         if (c != 13)
2500                                 lf(vc);
2501                         cr(vc);
2502                         start = (ushort *)vc->vc_pos;
2503                         myx = vc->vc_x;
2504                         if (c == 10 || c == 13)
2505                                 continue;
2506                 }
2507                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2508                 notify_write(vc, c);
2509                 cnt++;
2510                 if (myx == vc->vc_cols - 1) {
2511                         vc->vc_need_wrap = 1;
2512                         continue;
2513                 }
2514                 vc->vc_pos += 2;
2515                 myx++;
2516         }
2517         if (cnt > 0) {
2518                 if (CON_IS_VISIBLE(vc))
2519                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2520                 vc->vc_x += cnt;
2521                 if (vc->vc_x == vc->vc_cols) {
2522                         vc->vc_x--;
2523                         vc->vc_need_wrap = 1;
2524                 }
2525         }
2526         set_cursor(vc);
2527         notify_update(vc);
2528
2529 quit:
2530         spin_unlock(&printing_lock);
2531 }
2532
2533 static struct tty_driver *vt_console_device(struct console *c, int *index)
2534 {
2535         *index = c->index ? c->index-1 : fg_console;
2536         return console_driver;
2537 }
2538
2539 static struct console vt_console_driver = {
2540         .name           = "tty",
2541         .write          = vt_console_print,
2542         .device         = vt_console_device,
2543         .unblank        = unblank_screen,
2544         .flags          = CON_PRINTBUFFER,
2545         .index          = -1,
2546 };
2547 #endif
2548
2549 /*
2550  *      Handling of Linux-specific VC ioctls
2551  */
2552
2553 /*
2554  * Generally a bit racy with respect to console_sem().
2555  *
2556  * There are some functions which don't need it.
2557  *
2558  * There are some functions which can sleep for arbitrary periods
2559  * (paste_selection) but we don't need the lock there anyway.
2560  *
2561  * set_selection has locking, and definitely needs it
2562  */
2563
2564 int tioclinux(struct tty_struct *tty, unsigned long arg)
2565 {
2566         char type, data;
2567         char __user *p = (char __user *)arg;
2568         int lines;
2569         int ret;
2570
2571         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2572                 return -EPERM;
2573         if (get_user(type, p))
2574                 return -EFAULT;
2575         ret = 0;
2576
2577         lock_kernel();
2578
2579         switch (type)
2580         {
2581                 case TIOCL_SETSEL:
2582                         acquire_console_sem();
2583                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2584                         release_console_sem();
2585                         break;
2586                 case TIOCL_PASTESEL:
2587                         ret = paste_selection(tty);
2588                         break;
2589                 case TIOCL_UNBLANKSCREEN:
2590                         acquire_console_sem();
2591                         unblank_screen();
2592                         release_console_sem();
2593                         break;
2594                 case TIOCL_SELLOADLUT:
2595                         ret = sel_loadlut(p);
2596                         break;
2597                 case TIOCL_GETSHIFTSTATE:
2598
2599         /*
2600          * Make it possible to react to Shift+Mousebutton.
2601          * Note that 'shift_state' is an undocumented
2602          * kernel-internal variable; programs not closely
2603          * related to the kernel should not use this.
2604          */
2605                         data = shift_state;
2606                         ret = __put_user(data, p);
2607                         break;
2608                 case TIOCL_GETMOUSEREPORTING:
2609                         data = mouse_reporting();
2610                         ret = __put_user(data, p);
2611                         break;
2612                 case TIOCL_SETVESABLANK:
2613                         ret = set_vesa_blanking(p);
2614                         break;
2615                 case TIOCL_GETKMSGREDIRECT:
2616                         data = kmsg_redirect;
2617                         ret = __put_user(data, p);
2618                         break;
2619                 case TIOCL_SETKMSGREDIRECT:
2620                         if (!capable(CAP_SYS_ADMIN)) {
2621                                 ret = -EPERM;
2622                         } else {
2623                                 if (get_user(data, p+1))
2624                                         ret = -EFAULT;
2625                                 else
2626                                         kmsg_redirect = data;
2627                         }
2628                         break;
2629                 case TIOCL_GETFGCONSOLE:
2630                         ret = fg_console;
2631                         break;
2632                 case TIOCL_SCROLLCONSOLE:
2633                         if (get_user(lines, (s32 __user *)(p+4))) {
2634                                 ret = -EFAULT;
2635                         } else {
2636                                 scrollfront(vc_cons[fg_console].d, lines);
2637                                 ret = 0;
2638                         }
2639                         break;
2640                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2641                         acquire_console_sem();
2642                         ignore_poke = 1;
2643                         do_blank_screen(0);
2644                         release_console_sem();
2645                         break;
2646                 case TIOCL_BLANKEDSCREEN:
2647                         ret = console_blanked;
2648                         break;
2649                 default:
2650                         ret = -EINVAL;
2651                         break;
2652         }
2653         unlock_kernel();
2654         return ret;
2655 }
2656
2657 /*
2658  * /dev/ttyN handling
2659  */
2660
2661 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2662 {
2663         int     retval;
2664
2665         retval = do_con_write(tty, buf, count);
2666         con_flush_chars(tty);
2667
2668         return retval;
2669 }
2670
2671 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2672 {
2673         if (in_interrupt())
2674                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2675         return do_con_write(tty, &ch, 1);
2676 }
2677
2678 static int con_write_room(struct tty_struct *tty)
2679 {
2680         if (tty->stopped)
2681                 return 0;
2682         return 4096;            /* No limit, really; we're not buffering */
2683 }
2684
2685 static int con_chars_in_buffer(struct tty_struct *tty)
2686 {
2687         return 0;               /* we're not buffering */
2688 }
2689
2690 /*
2691  * con_throttle and con_unthrottle are only used for
2692  * paste_selection(), which has to stuff in a large number of
2693  * characters...
2694  */
2695 static void con_throttle(struct tty_struct *tty)
2696 {
2697 }
2698
2699 static void con_unthrottle(struct tty_struct *tty)
2700 {
2701         struct vc_data *vc = tty->driver_data;
2702
2703         wake_up_interruptible(&vc->paste_wait);
2704 }
2705
2706 /*
2707  * Turn the Scroll-Lock LED on when the tty is stopped
2708  */
2709 static void con_stop(struct tty_struct *tty)
2710 {
2711         int console_num;
2712         if (!tty)
2713                 return;
2714         console_num = tty->index;
2715         if (!vc_cons_allocated(console_num))
2716                 return;
2717         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2718         set_leds();
2719 }
2720
2721 /*
2722  * Turn the Scroll-Lock LED off when the console is started
2723  */
2724 static void con_start(struct tty_struct *tty)
2725 {
2726         int console_num;
2727         if (!tty)
2728                 return;
2729         console_num = tty->index;
2730         if (!vc_cons_allocated(console_num))
2731                 return;
2732         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2733         set_leds();
2734 }
2735
2736 static void con_flush_chars(struct tty_struct *tty)
2737 {
2738         struct vc_data *vc;
2739
2740         if (in_interrupt())     /* from flush_to_ldisc */
2741                 return;
2742
2743         /* if we race with con_close(), vt may be null */
2744         acquire_console_sem();
2745         vc = tty->driver_data;
2746         if (vc)
2747                 set_cursor(vc);
2748         release_console_sem();
2749 }
2750
2751 /*
2752  * Allocate the console screen memory.
2753  */
2754 static int con_open(struct tty_struct *tty, struct file *filp)
2755 {
2756         unsigned int currcons = tty->index;
2757         int ret = 0;
2758
2759         acquire_console_sem();
2760         if (tty->driver_data == NULL) {
2761                 ret = vc_allocate(currcons);
2762                 if (ret == 0) {
2763                         struct vc_data *vc = vc_cons[currcons].d;
2764
2765                         /* Still being freed */
2766                         if (vc->vc_tty) {
2767                                 release_console_sem();
2768                                 return -ERESTARTSYS;
2769                         }
2770                         tty->driver_data = vc;
2771                         vc->vc_tty = tty;
2772
2773                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2774                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2775                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2776                         }
2777                         if (vc->vc_utf)
2778                                 tty->termios->c_iflag |= IUTF8;
2779                         else
2780                                 tty->termios->c_iflag &= ~IUTF8;
2781                         vcs_make_sysfs(tty);
2782                         release_console_sem();
2783                         return ret;
2784                 }
2785         }
2786         release_console_sem();
2787         return ret;
2788 }
2789
2790 static void con_close(struct tty_struct *tty, struct file *filp)
2791 {
2792         /* Nothing to do - we defer to shutdown */
2793 }
2794
2795 static void con_shutdown(struct tty_struct *tty)
2796 {
2797         struct vc_data *vc = tty->driver_data;
2798         BUG_ON(vc == NULL);
2799         acquire_console_sem();
2800         vc->vc_tty = NULL;
2801         vcs_remove_sysfs(tty);
2802         release_console_sem();
2803         tty_shutdown(tty);
2804 }
2805
2806 static int default_italic_color    = 2; // green (ASCII)
2807 static int default_underline_color = 3; // cyan (ASCII)
2808 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2809 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2810
2811 static void vc_init(struct vc_data *vc, unsigned int rows,
2812                     unsigned int cols, int do_clear)
2813 {
2814         int j, k ;
2815
2816         vc->vc_cols = cols;
2817         vc->vc_rows = rows;
2818         vc->vc_size_row = cols << 1;
2819         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2820
2821         set_origin(vc);
2822         vc->vc_pos = vc->vc_origin;
2823         reset_vc(vc);
2824         for (j=k=0; j<16; j++) {
2825                 vc->vc_palette[k++] = default_red[j] ;
2826                 vc->vc_palette[k++] = default_grn[j] ;
2827                 vc->vc_palette[k++] = default_blu[j] ;
2828         }
2829         vc->vc_def_color       = 0x07;   /* white */
2830         vc->vc_ulcolor         = default_underline_color;
2831         vc->vc_itcolor         = default_italic_color;
2832         vc->vc_halfcolor       = 0x08;   /* grey */
2833         init_waitqueue_head(&vc->paste_wait);
2834         reset_terminal(vc, do_clear);
2835 }
2836
2837 /*
2838  * This routine initializes console interrupts, and does nothing
2839  * else. If you want the screen to clear, call tty_write with
2840  * the appropriate escape-sequence.
2841  */
2842
2843 static int __init con_init(void)
2844 {
2845         const char *display_desc = NULL;
2846         struct vc_data *vc;
2847         unsigned int currcons = 0, i;
2848
2849         acquire_console_sem();
2850
2851         if (conswitchp)
2852                 display_desc = conswitchp->con_startup();
2853         if (!display_desc) {
2854                 fg_console = 0;
2855                 release_console_sem();
2856                 return 0;
2857         }
2858
2859         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2860                 struct con_driver *con_driver = &registered_con_driver[i];
2861
2862                 if (con_driver->con == NULL) {
2863                         con_driver->con = conswitchp;
2864                         con_driver->desc = display_desc;
2865                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2866                         con_driver->first = 0;
2867                         con_driver->last = MAX_NR_CONSOLES - 1;
2868                         break;
2869                 }
2870         }
2871
2872         for (i = 0; i < MAX_NR_CONSOLES; i++)
2873                 con_driver_map[i] = conswitchp;
2874
2875         if (blankinterval) {
2876                 blank_state = blank_normal_wait;
2877                 mod_timer(&console_timer, jiffies + blankinterval);
2878         }
2879
2880         /*
2881          * kmalloc is not running yet - we use the bootmem allocator.
2882          */
2883         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2884                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2885                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2886                 visual_init(vc, currcons, 1);
2887                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2888                 vc->vc_kmalloced = 0;
2889                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2890                         currcons || !vc->vc_sw->con_save_screen);
2891         }
2892         currcons = fg_console = 0;
2893         master_display_fg = vc = vc_cons[currcons].d;
2894         set_origin(vc);
2895         save_screen(vc);
2896         gotoxy(vc, vc->vc_x, vc->vc_y);
2897         csi_J(vc, 0);
2898         update_screen(vc);
2899         printk("Console: %s %s %dx%d",
2900                 vc->vc_can_do_color ? "colour" : "mono",
2901                 display_desc, vc->vc_cols, vc->vc_rows);
2902         printable = 1;
2903         printk("\n");
2904
2905         release_console_sem();
2906
2907 #ifdef CONFIG_VT_CONSOLE
2908         register_console(&vt_console_driver);
2909 #endif
2910         return 0;
2911 }
2912 console_initcall(con_init);
2913
2914 static const struct tty_operations con_ops = {
2915         .open = con_open,
2916         .close = con_close,
2917         .write = con_write,
2918         .write_room = con_write_room,
2919         .put_char = con_put_char,
2920         .flush_chars = con_flush_chars,
2921         .chars_in_buffer = con_chars_in_buffer,
2922         .ioctl = vt_ioctl,
2923         .stop = con_stop,
2924         .start = con_start,
2925         .throttle = con_throttle,
2926         .unthrottle = con_unthrottle,
2927         .resize = vt_resize,
2928         .shutdown = con_shutdown
2929 };
2930
2931 static struct cdev vc0_cdev;
2932
2933 int __init vty_init(const struct file_operations *console_fops)
2934 {
2935         cdev_init(&vc0_cdev, console_fops);
2936         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2937             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2938                 panic("Couldn't register /dev/tty0 driver\n");
2939         device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2940
2941         vcs_init();
2942
2943         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2944         if (!console_driver)
2945                 panic("Couldn't allocate console driver\n");
2946         console_driver->owner = THIS_MODULE;
2947         console_driver->name = "tty";
2948         console_driver->name_base = 1;
2949         console_driver->major = TTY_MAJOR;
2950         console_driver->minor_start = 1;
2951         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2952         console_driver->init_termios = tty_std_termios;
2953         if (default_utf8)
2954                 console_driver->init_termios.c_iflag |= IUTF8;
2955         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2956         tty_set_operations(console_driver, &con_ops);
2957         if (tty_register_driver(console_driver))
2958                 panic("Couldn't register console driver\n");
2959         kbd_init();
2960         console_map_init();
2961 #ifdef CONFIG_PROM_CONSOLE
2962         prom_con_init();
2963 #endif
2964 #ifdef CONFIG_MDA_CONSOLE
2965         mda_console_init();
2966 #endif
2967         return 0;
2968 }
2969
2970 #ifndef VT_SINGLE_DRIVER
2971 #include <linux/device.h>
2972
2973 static struct class *vtconsole_class;
2974
2975 static int bind_con_driver(const struct consw *csw, int first, int last,
2976                            int deflt)
2977 {
2978         struct module *owner = csw->owner;
2979         const char *desc = NULL;
2980         struct con_driver *con_driver;
2981         int i, j = -1, k = -1, retval = -ENODEV;
2982
2983         if (!try_module_get(owner))
2984                 return -ENODEV;
2985
2986         acquire_console_sem();
2987
2988         /* check if driver is registered */
2989         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2990                 con_driver = &registered_con_driver[i];
2991
2992                 if (con_driver->con == csw) {
2993                         desc = con_driver->desc;
2994                         retval = 0;
2995                         break;
2996                 }
2997         }
2998
2999         if (retval)
3000                 goto err;
3001
3002         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3003                 csw->con_startup();
3004                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3005         }
3006
3007         if (deflt) {
3008                 if (conswitchp)
3009                         module_put(conswitchp->owner);
3010
3011                 __module_get(owner);
3012                 conswitchp = csw;
3013         }
3014
3015         first = max(first, con_driver->first);
3016         last = min(last, con_driver->last);
3017
3018         for (i = first; i <= last; i++) {
3019                 int old_was_color;
3020                 struct vc_data *vc = vc_cons[i].d;
3021
3022                 if (con_driver_map[i])
3023                         module_put(con_driver_map[i]->owner);
3024                 __module_get(owner);
3025                 con_driver_map[i] = csw;
3026
3027                 if (!vc || !vc->vc_sw)
3028                         continue;
3029
3030                 j = i;
3031
3032                 if (CON_IS_VISIBLE(vc)) {
3033                         k = i;
3034                         save_screen(vc);
3035                 }
3036
3037                 old_was_color = vc->vc_can_do_color;
3038                 vc->vc_sw->con_deinit(vc);
3039                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3040                 visual_init(vc, i, 0);
3041                 set_origin(vc);
3042                 update_attr(vc);
3043
3044                 /* If the console changed between mono <-> color, then
3045                  * the attributes in the screenbuf will be wrong.  The
3046                  * following resets all attributes to something sane.
3047                  */
3048                 if (old_was_color != vc->vc_can_do_color)
3049                         clear_buffer_attributes(vc);
3050         }
3051
3052         printk("Console: switching ");
3053         if (!deflt)
3054                 printk("consoles %d-%d ", first+1, last+1);
3055         if (j >= 0) {
3056                 struct vc_data *vc = vc_cons[j].d;
3057
3058                 printk("to %s %s %dx%d\n",
3059                        vc->vc_can_do_color ? "colour" : "mono",
3060                        desc, vc->vc_cols, vc->vc_rows);
3061
3062                 if (k >= 0) {
3063                         vc = vc_cons[k].d;
3064                         update_screen(vc);
3065                 }
3066         } else
3067                 printk("to %s\n", desc);
3068
3069         retval = 0;
3070 err:
3071         release_console_sem();
3072         module_put(owner);
3073         return retval;
3074 };
3075
3076 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3077 static int con_is_graphics(const struct consw *csw, int first, int last)
3078 {
3079         int i, retval = 0;
3080
3081         for (i = first; i <= last; i++) {
3082                 struct vc_data *vc = vc_cons[i].d;
3083
3084                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3085                         retval = 1;
3086                         break;
3087                 }
3088         }
3089
3090         return retval;
3091 }
3092
3093 /**
3094  * unbind_con_driver - unbind a console driver
3095  * @csw: pointer to console driver to unregister
3096  * @first: first in range of consoles that @csw should be unbound from
3097  * @last: last in range of consoles that @csw should be unbound from
3098  * @deflt: should next bound console driver be default after @csw is unbound?
3099  *
3100  * To unbind a driver from all possible consoles, pass 0 as @first and
3101  * %MAX_NR_CONSOLES as @last.
3102  *
3103  * @deflt controls whether the console that ends up replacing @csw should be
3104  * the default console.
3105  *
3106  * RETURNS:
3107  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3108  * or 0 on success.
3109  */
3110 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3111 {
3112         struct module *owner = csw->owner;
3113         const struct consw *defcsw = NULL;
3114         struct con_driver *con_driver = NULL, *con_back = NULL;
3115         int i, retval = -ENODEV;
3116
3117         if (!try_module_get(owner))
3118                 return -ENODEV;
3119
3120         acquire_console_sem();
3121
3122         /* check if driver is registered and if it is unbindable */
3123         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3124                 con_driver = &registered_con_driver[i];
3125
3126                 if (con_driver->con == csw &&
3127                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3128                         retval = 0;
3129                         break;
3130                 }
3131         }
3132
3133         if (retval) {
3134                 release_console_sem();
3135                 goto err;
3136         }
3137
3138         retval = -ENODEV;
3139
3140         /* check if backup driver exists */
3141         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3142                 con_back = &registered_con_driver[i];
3143
3144                 if (con_back->con &&
3145                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3146                         defcsw = con_back->con;
3147                         retval = 0;
3148                         break;
3149                 }
3150         }
3151
3152         if (retval) {
3153                 release_console_sem();
3154                 goto err;
3155         }
3156
3157         if (!con_is_bound(csw)) {
3158                 release_console_sem();
3159                 goto err;
3160         }
3161
3162         first = max(first, con_driver->first);
3163         last = min(last, con_driver->last);
3164
3165         for (i = first; i <= last; i++) {
3166                 if (con_driver_map[i] == csw) {
3167                         module_put(csw->owner);
3168                         con_driver_map[i] = NULL;
3169                 }
3170         }
3171
3172         if (!con_is_bound(defcsw)) {
3173                 const struct consw *defconsw = conswitchp;
3174
3175                 defcsw->con_startup();
3176                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3177                 /*
3178                  * vgacon may change the default driver to point
3179                  * to dummycon, we restore it here...
3180                  */
3181                 conswitchp = defconsw;
3182         }
3183
3184         if (!con_is_bound(csw))
3185                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3186
3187         release_console_sem();
3188         /* ignore return value, binding should not fail */
3189         bind_con_driver(defcsw, first, last, deflt);
3190 err:
3191         module_put(owner);
3192         return retval;
3193
3194 }
3195 EXPORT_SYMBOL(unbind_con_driver);
3196
3197 static int vt_bind(struct con_driver *con)
3198 {
3199         const struct consw *defcsw = NULL, *csw = NULL;
3200         int i, more = 1, first = -1, last = -1, deflt = 0;
3201
3202         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3203             con_is_graphics(con->con, con->first, con->last))
3204                 goto err;
3205
3206         csw = con->con;
3207
3208         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3209                 struct con_driver *con = &registered_con_driver[i];
3210
3211                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3212                         defcsw = con->con;
3213                         break;
3214                 }
3215         }
3216
3217         if (!defcsw)
3218                 goto err;
3219
3220         while (more) {
3221                 more = 0;
3222
3223                 for (i = con->first; i <= con->last; i++) {
3224                         if (con_driver_map[i] == defcsw) {
3225                                 if (first == -1)
3226                                         first = i;
3227                                 last = i;
3228                                 more = 1;
3229                         } else if (first != -1)
3230                                 break;
3231                 }
3232
3233                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3234                         deflt = 1;
3235
3236                 if (first != -1)
3237                         bind_con_driver(csw, first, last, deflt);
3238
3239                 first = -1;
3240                 last = -1;
3241                 deflt = 0;
3242         }
3243
3244 err:
3245         return 0;
3246 }
3247
3248 static int vt_unbind(struct con_driver *con)
3249 {
3250         const struct consw *csw = NULL;
3251         int i, more = 1, first = -1, last = -1, deflt = 0;
3252
3253         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3254             con_is_graphics(con->con, con->first, con->last))
3255                 goto err;
3256
3257         csw = con->con;
3258
3259         while (more) {
3260                 more = 0;
3261
3262                 for (i = con->first; i <= con->last; i++) {
3263                         if (con_driver_map[i] == csw) {
3264                                 if (first == -1)
3265                                         first = i;
3266                                 last = i;
3267                                 more = 1;
3268                         } else if (first != -1)
3269                                 break;
3270                 }
3271
3272                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3273                         deflt = 1;
3274
3275                 if (first != -1)
3276                         unbind_con_driver(csw, first, last, deflt);
3277
3278                 first = -1;
3279                 last = -1;
3280                 deflt = 0;
3281         }
3282
3283 err:
3284         return 0;
3285 }
3286 #else
3287 static inline int vt_bind(struct con_driver *con)
3288 {
3289         return 0;
3290 }
3291 static inline int vt_unbind(struct con_driver *con)
3292 {
3293         return 0;
3294 }
3295 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3296
3297 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3298                           const char *buf, size_t count)
3299 {
3300         struct con_driver *con = dev_get_drvdata(dev);
3301         int bind = simple_strtoul(buf, NULL, 0);
3302
3303         if (bind)
3304                 vt_bind(con);
3305         else
3306                 vt_unbind(con);
3307
3308         return count;
3309 }
3310
3311 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3312                          char *buf)
3313 {
3314         struct con_driver *con = dev_get_drvdata(dev);
3315         int bind = con_is_bound(con->con);
3316
3317         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3318 }
3319
3320 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3321                          char *buf)
3322 {
3323         struct con_driver *con = dev_get_drvdata(dev);
3324
3325         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3326                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3327                          con->desc);
3328
3329 }
3330
3331 static struct device_attribute device_attrs[] = {
3332         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3333         __ATTR(name, S_IRUGO, show_name, NULL),
3334 };
3335
3336 static int vtconsole_init_device(struct con_driver *con)
3337 {
3338         int i;
3339         int error = 0;
3340
3341         con->flag |= CON_DRIVER_FLAG_ATTR;
3342         dev_set_drvdata(con->dev, con);
3343         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3344                 error = device_create_file(con->dev, &device_attrs[i]);
3345                 if (error)
3346                         break;
3347         }
3348
3349         if (error) {
3350                 while (--i >= 0)
3351                         device_remove_file(con->dev, &device_attrs[i]);
3352                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3353         }
3354
3355         return error;
3356 }
3357
3358 static void vtconsole_deinit_device(struct con_driver *con)
3359 {
3360         int i;
3361
3362         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3363                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3364                         device_remove_file(con->dev, &device_attrs[i]);
3365                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3366         }
3367 }
3368
3369 /**
3370  * con_is_bound - checks if driver is bound to the console
3371  * @csw: console driver
3372  *
3373  * RETURNS: zero if unbound, nonzero if bound
3374  *
3375  * Drivers can call this and if zero, they should release
3376  * all resources allocated on con_startup()
3377  */
3378 int con_is_bound(const struct consw *csw)
3379 {
3380         int i, bound = 0;
3381
3382         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3383                 if (con_driver_map[i] == csw) {
3384                         bound = 1;
3385                         break;
3386                 }
3387         }
3388
3389         return bound;
3390 }
3391 EXPORT_SYMBOL(con_is_bound);
3392
3393 /**
3394  * register_con_driver - register console driver to console layer
3395  * @csw: console driver
3396  * @first: the first console to take over, minimum value is 0
3397  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3398  *
3399  * DESCRIPTION: This function registers a console driver which can later
3400  * bind to a range of consoles specified by @first and @last. It will
3401  * also initialize the console driver by calling con_startup().
3402  */
3403 int register_con_driver(const struct consw *csw, int first, int last)
3404 {
3405         struct module *owner = csw->owner;
3406         struct con_driver *con_driver;
3407         const char *desc;
3408         int i, retval = 0;
3409
3410         if (!try_module_get(owner))
3411                 return -ENODEV;
3412
3413         acquire_console_sem();
3414
3415         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3416                 con_driver = &registered_con_driver[i];
3417
3418                 /* already registered */
3419                 if (con_driver->con == csw)
3420                         retval = -EINVAL;
3421         }
3422
3423         if (retval)
3424                 goto err;
3425
3426         desc = csw->con_startup();
3427
3428         if (!desc)
3429                 goto err;
3430
3431         retval = -EINVAL;
3432
3433         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3434                 con_driver = &registered_con_driver[i];
3435
3436                 if (con_driver->con == NULL) {
3437                         con_driver->con = csw;
3438                         con_driver->desc = desc;
3439                         con_driver->node = i;
3440                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3441                                            CON_DRIVER_FLAG_INIT;
3442                         con_driver->first = first;
3443                         con_driver->last = last;
3444                         retval = 0;
3445                         break;
3446                 }
3447         }
3448
3449         if (retval)
3450                 goto err;
3451
3452         con_driver->dev = device_create(vtconsole_class, NULL,
3453                                                 MKDEV(0, con_driver->node),
3454                                                 NULL, "vtcon%i",
3455                                                 con_driver->node);
3456
3457         if (IS_ERR(con_driver->dev)) {
3458                 printk(KERN_WARNING "Unable to create device for %s; "
3459                        "errno = %ld\n", con_driver->desc,
3460                        PTR_ERR(con_driver->dev));
3461                 con_driver->dev = NULL;
3462         } else {
3463                 vtconsole_init_device(con_driver);
3464         }
3465
3466 err:
3467         release_console_sem();
3468         module_put(owner);
3469         return retval;
3470 }
3471 EXPORT_SYMBOL(register_con_driver);
3472
3473 /**
3474  * unregister_con_driver - unregister console driver from console layer
3475  * @csw: console driver
3476  *
3477  * DESCRIPTION: All drivers that registers to the console layer must
3478  * call this function upon exit, or if the console driver is in a state
3479  * where it won't be able to handle console services, such as the
3480  * framebuffer console without loaded framebuffer drivers.
3481  *
3482  * The driver must unbind first prior to unregistration.
3483  */
3484 int unregister_con_driver(const struct consw *csw)
3485 {
3486         int i, retval = -ENODEV;
3487
3488         acquire_console_sem();
3489
3490         /* cannot unregister a bound driver */
3491         if (con_is_bound(csw))
3492                 goto err;
3493
3494         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3495                 struct con_driver *con_driver = &registered_con_driver[i];
3496
3497                 if (con_driver->con == csw &&
3498                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3499                         vtconsole_deinit_device(con_driver);
3500                         device_destroy(vtconsole_class,
3501                                        MKDEV(0, con_driver->node));
3502                         con_driver->con = NULL;
3503                         con_driver->desc = NULL;
3504                         con_driver->dev = NULL;
3505                         con_driver->node = 0;
3506                         con_driver->flag = 0;
3507                         con_driver->first = 0;
3508                         con_driver->last = 0;
3509                         retval = 0;
3510                         break;
3511                 }
3512         }
3513 err:
3514         release_console_sem();
3515         return retval;
3516 }
3517 EXPORT_SYMBOL(unregister_con_driver);
3518
3519 /*
3520  *      If we support more console drivers, this function is used
3521  *      when a driver wants to take over some existing consoles
3522  *      and become default driver for newly opened ones.
3523  *
3524  *      take_over_console is basically a register followed by unbind
3525  */
3526 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3527 {
3528         int err;
3529
3530         err = register_con_driver(csw, first, last);
3531
3532         if (!err)
3533                 bind_con_driver(csw, first, last, deflt);
3534
3535         return err;
3536 }
3537
3538 /*
3539  * give_up_console is a wrapper to unregister_con_driver. It will only
3540  * work if driver is fully unbound.
3541  */
3542 void give_up_console(const struct consw *csw)
3543 {
3544         unregister_con_driver(csw);
3545 }
3546
3547 static int __init vtconsole_class_init(void)
3548 {
3549         int i;
3550
3551         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3552         if (IS_ERR(vtconsole_class)) {
3553                 printk(KERN_WARNING "Unable to create vt console class; "
3554                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3555                 vtconsole_class = NULL;
3556         }
3557
3558         /* Add system drivers to sysfs */
3559         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3560                 struct con_driver *con = &registered_con_driver[i];
3561
3562                 if (con->con && !con->dev) {
3563                         con->dev = device_create(vtconsole_class, NULL,
3564                                                          MKDEV(0, con->node),
3565                                                          NULL, "vtcon%i",
3566                                                          con->node);
3567
3568                         if (IS_ERR(con->dev)) {
3569                                 printk(KERN_WARNING "Unable to create "
3570                                        "device for %s; errno = %ld\n",
3571                                        con->desc, PTR_ERR(con->dev));
3572                                 con->dev = NULL;
3573                         } else {
3574                                 vtconsole_init_device(con);
3575                         }
3576                 }
3577         }
3578
3579         return 0;
3580 }
3581 postcore_initcall(vtconsole_class_init);
3582
3583 #endif
3584
3585 /*
3586  *      Screen blanking
3587  */
3588
3589 static int set_vesa_blanking(char __user *p)
3590 {
3591         unsigned int mode;
3592
3593         if (get_user(mode, p + 1))
3594                 return -EFAULT;
3595
3596         vesa_blank_mode = (mode < 4) ? mode : 0;
3597         return 0;
3598 }
3599
3600 void do_blank_screen(int entering_gfx)
3601 {
3602         struct vc_data *vc = vc_cons[fg_console].d;
3603         int i;
3604
3605         WARN_CONSOLE_UNLOCKED();
3606
3607         if (console_blanked) {
3608                 if (blank_state == blank_vesa_wait) {
3609                         blank_state = blank_off;
3610                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3611                 }
3612                 return;
3613         }
3614
3615         /* entering graphics mode? */
3616         if (entering_gfx) {
3617                 hide_cursor(vc);
3618                 save_screen(vc);
3619                 vc->vc_sw->con_blank(vc, -1, 1);
3620                 console_blanked = fg_console + 1;
3621                 blank_state = blank_off;
3622                 set_origin(vc);
3623                 return;
3624         }
3625
3626         if (blank_state != blank_normal_wait)
3627                 return;
3628         blank_state = blank_off;
3629
3630         /* don't blank graphics */
3631         if (vc->vc_mode != KD_TEXT) {
3632                 console_blanked = fg_console + 1;
3633                 return;
3634         }
3635
3636         hide_cursor(vc);
3637         del_timer_sync(&console_timer);
3638         blank_timer_expired = 0;
3639
3640         save_screen(vc);
3641         /* In case we need to reset origin, blanking hook returns 1 */
3642         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3643         console_blanked = fg_console + 1;
3644         if (i)
3645                 set_origin(vc);
3646
3647         if (console_blank_hook && console_blank_hook(1))
3648                 return;
3649
3650         if (vesa_off_interval && vesa_blank_mode) {
3651                 blank_state = blank_vesa_wait;
3652                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3653         }
3654 }
3655 EXPORT_SYMBOL(do_blank_screen);
3656
3657 /*
3658  * Called by timer as well as from vt_console_driver
3659  */
3660 void do_unblank_screen(int leaving_gfx)
3661 {
3662         struct vc_data *vc;
3663
3664         /* This should now always be called from a "sane" (read: can schedule)
3665          * context for the sake of the low level drivers, except in the special
3666          * case of oops_in_progress
3667          */
3668         if (!oops_in_progress)
3669                 might_sleep();
3670
3671         WARN_CONSOLE_UNLOCKED();
3672
3673         ignore_poke = 0;
3674         if (!console_blanked)
3675                 return;
3676         if (!vc_cons_allocated(fg_console)) {
3677                 /* impossible */
3678                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3679                 return;
3680         }
3681         vc = vc_cons[fg_console].d;
3682         if (vc->vc_mode != KD_TEXT)
3683                 return; /* but leave console_blanked != 0 */
3684
3685         if (blankinterval) {
3686                 mod_timer(&console_timer, jiffies + blankinterval);
3687                 blank_state = blank_normal_wait;
3688         }
3689
3690         console_blanked = 0;
3691         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3692                 /* Low-level driver cannot restore -> do it ourselves */
3693                 update_screen(vc);
3694         if (console_blank_hook)
3695                 console_blank_hook(0);
3696         set_palette(vc);
3697         set_cursor(vc);
3698 }
3699 EXPORT_SYMBOL(do_unblank_screen);
3700
3701 /*
3702  * This is called by the outside world to cause a forced unblank, mostly for
3703  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3704  * call it with 1 as an argument and so force a mode restore... that may kill
3705  * X or at least garbage the screen but would also make the Oops visible...
3706  */
3707 void unblank_screen(void)
3708 {
3709         do_unblank_screen(0);
3710 }
3711
3712 /*
3713  * We defer the timer blanking to work queue so it can take the console mutex
3714  * (console operations can still happen at irq time, but only from printk which
3715  * has the console mutex. Not perfect yet, but better than no locking
3716  */
3717 static void blank_screen_t(unsigned long dummy)
3718 {
3719         if (unlikely(!keventd_up())) {
3720                 mod_timer(&console_timer, jiffies + blankinterval);
3721                 return;
3722         }
3723         blank_timer_expired = 1;
3724         schedule_work(&console_work);
3725 }
3726
3727 void poke_blanked_console(void)
3728 {
3729         WARN_CONSOLE_UNLOCKED();
3730
3731         /* Add this so we quickly catch whoever might call us in a non
3732          * safe context. Nowadays, unblank_screen() isn't to be called in
3733          * atomic contexts and is allowed to schedule (with the special case
3734          * of oops_in_progress, but that isn't of any concern for this
3735          * function. --BenH.
3736          */
3737         might_sleep();
3738
3739         /* This isn't perfectly race free, but a race here would be mostly harmless,
3740          * at worse, we'll do a spurrious blank and it's unlikely
3741          */
3742         del_timer(&console_timer);
3743         blank_timer_expired = 0;
3744
3745         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3746                 return;
3747         if (console_blanked)
3748                 unblank_screen();
3749         else if (blankinterval) {
3750                 mod_timer(&console_timer, jiffies + blankinterval);
3751                 blank_state = blank_normal_wait;
3752         }
3753 }
3754
3755 /*
3756  *      Palettes
3757  */
3758
3759 static void set_palette(struct vc_data *vc)
3760 {
3761         WARN_CONSOLE_UNLOCKED();
3762
3763         if (vc->vc_mode != KD_GRAPHICS)
3764                 vc->vc_sw->con_set_palette(vc, color_table);
3765 }
3766
3767 static int set_get_cmap(unsigned char __user *arg, int set)
3768 {
3769     int i, j, k;
3770
3771     WARN_CONSOLE_UNLOCKED();
3772
3773     for (i = 0; i < 16; i++)
3774         if (set) {
3775             get_user(default_red[i], arg++);
3776             get_user(default_grn[i], arg++);
3777             get_user(default_blu[i], arg++);
3778         } else {
3779             put_user(default_red[i], arg++);
3780             put_user(default_grn[i], arg++);
3781             put_user(default_blu[i], arg++);
3782         }
3783     if (set) {
3784         for (i = 0; i < MAX_NR_CONSOLES; i++)
3785             if (vc_cons_allocated(i)) {
3786                 for (j = k = 0; j < 16; j++) {
3787                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3788                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3789                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3790                 }
3791                 set_palette(vc_cons[i].d);
3792             }
3793     }
3794     return 0;
3795 }
3796
3797 /*
3798  * Load palette into the DAC registers. arg points to a colour
3799  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3800  */
3801
3802 int con_set_cmap(unsigned char __user *arg)
3803 {
3804         int rc;
3805
3806         acquire_console_sem();
3807         rc = set_get_cmap (arg,1);
3808         release_console_sem();
3809
3810         return rc;
3811 }
3812
3813 int con_get_cmap(unsigned char __user *arg)
3814 {
3815         int rc;
3816
3817         acquire_console_sem();
3818         rc = set_get_cmap (arg,0);
3819         release_console_sem();
3820
3821         return rc;
3822 }
3823
3824 void reset_palette(struct vc_data *vc)
3825 {
3826         int j, k;
3827         for (j=k=0; j<16; j++) {
3828                 vc->vc_palette[k++] = default_red[j];
3829                 vc->vc_palette[k++] = default_grn[j];
3830                 vc->vc_palette[k++] = default_blu[j];
3831         }
3832         set_palette(vc);
3833 }
3834
3835 /*
3836  *  Font switching
3837  *
3838  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3839  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3840  *  depending on width) reserved for each character which is kinda wasty, but
3841  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3842  *  is upto the actual low-level console-driver convert data into its favorite
3843  *  format (maybe we should add a `fontoffset' field to the `display'
3844  *  structure so we won't have to convert the fontdata all the time.
3845  *  /Jes
3846  */
3847
3848 #define max_font_size 65536
3849
3850 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3851 {
3852         struct console_font font;
3853         int rc = -EINVAL;
3854         int c;
3855
3856         if (vc->vc_mode != KD_TEXT)
3857                 return -EINVAL;
3858
3859         if (op->data) {
3860                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3861                 if (!font.data)
3862                         return -ENOMEM;
3863         } else
3864                 font.data = NULL;
3865
3866         acquire_console_sem();
3867         if (vc->vc_sw->con_font_get)
3868                 rc = vc->vc_sw->con_font_get(vc, &font);
3869         else
3870                 rc = -ENOSYS;
3871         release_console_sem();
3872
3873         if (rc)
3874                 goto out;
3875
3876         c = (font.width+7)/8 * 32 * font.charcount;
3877
3878         if (op->data && font.charcount > op->charcount)
3879                 rc = -ENOSPC;
3880         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3881                 if (font.width > op->width || font.height > op->height)
3882                         rc = -ENOSPC;
3883         } else {
3884                 if (font.width != 8)
3885                         rc = -EIO;
3886                 else if ((op->height && font.height > op->height) ||
3887                          font.height > 32)
3888                         rc = -ENOSPC;
3889         }
3890         if (rc)
3891                 goto out;
3892
3893         op->height = font.height;
3894         op->width = font.width;
3895         op->charcount = font.charcount;
3896
3897         if (op->data && copy_to_user(op->data, font.data, c))
3898                 rc = -EFAULT;
3899
3900 out:
3901         kfree(font.data);
3902         return rc;
3903 }
3904
3905 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3906 {
3907         struct console_font font;
3908         int rc = -EINVAL;
3909         int size;
3910
3911         if (vc->vc_mode != KD_TEXT)
3912                 return -EINVAL;
3913         if (!op->data)
3914                 return -EINVAL;
3915         if (op->charcount > 512)
3916                 return -EINVAL;
3917         if (!op->height) {              /* Need to guess font height [compat] */
3918                 int h, i;
3919                 u8 __user *charmap = op->data;
3920                 u8 tmp;
3921
3922                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3923                    so that we can get rid of this soon */
3924                 if (!(op->flags & KD_FONT_FLAG_OLD))
3925                         return -EINVAL;
3926                 for (h = 32; h > 0; h--)
3927                         for (i = 0; i < op->charcount; i++) {
3928                                 if (get_user(tmp, &charmap[32*i+h-1]))
3929                                         return -EFAULT;
3930                                 if (tmp)
3931                                         goto nonzero;
3932                         }
3933                 return -EINVAL;
3934         nonzero:
3935                 op->height = h;
3936         }
3937         if (op->width <= 0 || op->width > 32 || op->height > 32)
3938                 return -EINVAL;
3939         size = (op->width+7)/8 * 32 * op->charcount;
3940         if (size > max_font_size)
3941                 return -ENOSPC;
3942         font.charcount = op->charcount;
3943         font.height = op->height;
3944         font.width = op->width;
3945         font.data = kmalloc(size, GFP_KERNEL);
3946         if (!font.data)
3947                 return -ENOMEM;
3948         if (copy_from_user(font.data, op->data, size)) {
3949                 kfree(font.data);
3950                 return -EFAULT;
3951         }
3952         acquire_console_sem();
3953         if (vc->vc_sw->con_font_set)
3954                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3955         else
3956                 rc = -ENOSYS;
3957         release_console_sem();
3958         kfree(font.data);
3959         return rc;
3960 }
3961
3962 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3963 {
3964         struct console_font font = {.width = op->width, .height = op->height};
3965         char name[MAX_FONT_NAME];
3966         char *s = name;
3967         int rc;
3968
3969         if (vc->vc_mode != KD_TEXT)
3970                 return -EINVAL;
3971
3972         if (!op->data)
3973                 s = NULL;
3974         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3975                 return -EFAULT;
3976         else
3977                 name[MAX_FONT_NAME - 1] = 0;
3978
3979         acquire_console_sem();
3980         if (vc->vc_sw->con_font_default)
3981                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3982         else
3983                 rc = -ENOSYS;
3984         release_console_sem();
3985         if (!rc) {
3986                 op->width = font.width;
3987                 op->height = font.height;
3988         }
3989         return rc;
3990 }
3991
3992 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3993 {
3994         int con = op->height;
3995         int rc;
3996
3997         if (vc->vc_mode != KD_TEXT)
3998                 return -EINVAL;
3999
4000         acquire_console_sem();
4001         if (!vc->vc_sw->con_font_copy)
4002                 rc = -ENOSYS;
4003         else if (con < 0 || !vc_cons_allocated(con))
4004                 rc = -ENOTTY;
4005         else if (con == vc->vc_num)     /* nothing to do */
4006                 rc = 0;
4007         else
4008                 rc = vc->vc_sw->con_font_copy(vc, con);
4009         release_console_sem();
4010         return rc;
4011 }
4012
4013 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4014 {
4015         switch (op->op) {
4016         case KD_FONT_OP_SET:
4017                 return con_font_set(vc, op);
4018         case KD_FONT_OP_GET:
4019                 return con_font_get(vc, op);
4020         case KD_FONT_OP_SET_DEFAULT:
4021                 return con_font_default(vc, op);
4022         case KD_FONT_OP_COPY:
4023                 return con_font_copy(vc, op);
4024         }
4025         return -ENOSYS;
4026 }
4027
4028 /*
4029  *      Interface exported to selection and vcs.
4030  */
4031
4032 /* used by selection */
4033 u16 screen_glyph(struct vc_data *vc, int offset)
4034 {
4035         u16 w = scr_readw(screenpos(vc, offset, 1));
4036         u16 c = w & 0xff;
4037
4038         if (w & vc->vc_hi_font_mask)
4039                 c |= 0x100;
4040         return c;
4041 }
4042 EXPORT_SYMBOL_GPL(screen_glyph);
4043
4044 /* used by vcs - note the word offset */
4045 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4046 {
4047         return screenpos(vc, 2 * w_offset, viewed);
4048 }
4049
4050 void getconsxy(struct vc_data *vc, unsigned char *p)
4051 {
4052         p[0] = vc->vc_x;
4053         p[1] = vc->vc_y;
4054 }
4055
4056 void putconsxy(struct vc_data *vc, unsigned char *p)
4057 {
4058         hide_cursor(vc);
4059         gotoxy(vc, p[0], p[1]);
4060         set_cursor(vc);
4061 }
4062
4063 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4064 {
4065         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4066                 return softcursor_original;
4067         return scr_readw(org);
4068 }
4069
4070 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4071 {
4072         scr_writew(val, org);
4073         if ((unsigned long)org == vc->vc_pos) {
4074                 softcursor_original = -1;
4075                 add_softcursor(vc);
4076         }
4077 }
4078
4079 /*
4080  *      Visible symbols for modules
4081  */
4082
4083 EXPORT_SYMBOL(color_table);
4084 EXPORT_SYMBOL(default_red);
4085 EXPORT_SYMBOL(default_grn);
4086 EXPORT_SYMBOL(default_blu);
4087 EXPORT_SYMBOL(update_region);
4088 EXPORT_SYMBOL(redraw_screen);
4089 EXPORT_SYMBOL(vc_resize);
4090 EXPORT_SYMBOL(fg_console);
4091 EXPORT_SYMBOL(console_blank_hook);
4092 EXPORT_SYMBOL(console_blanked);
4093 EXPORT_SYMBOL(vc_cons);
4094 #ifndef VT_SINGLE_DRIVER
4095 EXPORT_SYMBOL(take_over_console);
4096 EXPORT_SYMBOL(give_up_console);
4097 #endif