Pileus Git - ~andy/linux/blob - drivers/char/vt.c

   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton
  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/smp_lock.h>
  93 #include <linux/tiocl.h>
  94 #include <linux/kbd_kern.h>
  95 #include <linux/consolemap.h>
  96 #include <linux/timer.h>
  97 #include <linux/interrupt.h>
  98 #include <linux/workqueue.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 #include <linux/kdb.h>
 108
 109 #define MAX_NR_CON_DRIVER 16
 110
 111 #define CON_DRIVER_FLAG_MODULE 1
 112 #define CON_DRIVER_FLAG_INIT   2
 113 #define CON_DRIVER_FLAG_ATTR   4
 114
 115 struct con_driver {
 116         const struct consw *con;
 117         const char *desc;
 118         struct device *dev;
 119         int node;
 120         int first;
 121         int last;
 122         int flag;
 123 };
 124
 125 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 126 const struct consw *conswitchp;
 127
 128 /* A bitmap for codes <32. A bit of 1 indicates that the code
 129  * corresponding to that bit number invokes some special action
 130  * (such as cursor movement) and should not be displayed as a
 131  * glyph unless the disp_ctrl mode is explicitly enabled.
 132  */
 133 #define CTRL_ACTION 0x0d00ff81
 134 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 135
 136 /*
 137  * Here is the default bell parameters: 750HZ, 1/8th of a second
 138  */
 139 #define DEFAULT_BELL_PITCH      750
 140 #define DEFAULT_BELL_DURATION   (HZ/8)
 141
 142 struct vc vc_cons [MAX_NR_CONSOLES];
 143
 144 #ifndef VT_SINGLE_DRIVER
 145 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 146 #endif
 147
 148 static int con_open(struct tty_struct *, struct file *);
 149 static void vc_init(struct vc_data *vc, unsigned int rows,
 150                     unsigned int cols, int do_clear);
 151 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 152 static void save_cur(struct vc_data *vc);
 153 static void reset_terminal(struct vc_data *vc, int do_clear);
 154 static void con_flush_chars(struct tty_struct *tty);
 155 static int set_vesa_blanking(char __user *p);
 156 static void set_cursor(struct vc_data *vc);
 157 static void hide_cursor(struct vc_data *vc);
 158 static void console_callback(struct work_struct *ignored);
 159 static void blank_screen_t(unsigned long dummy);
 160 static void set_palette(struct vc_data *vc);
 161
 162 static int printable;           /* Is console ready for printing? */
 163 int default_utf8 = true;
 164 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 165 int global_cursor_default = -1;
 166 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 167
 168 static int cur_default = CUR_DEFAULT;
 169 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 170
 171 /*
 172  * ignore_poke: don't unblank the screen when things are typed.  This is
 173  * mainly for the privacy of braille terminal users.
 174  */
 175 static int ignore_poke;
 176
 177 int do_poke_blanked_console;
 178 int console_blanked;
 179
 180 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 181 static int vesa_off_interval;
 182 static int blankinterval = 10*60;
 183 core_param(consoleblank, blankinterval, int, 0444);
 184
 185 static DECLARE_WORK(console_work, console_callback);
 186
 187 /*
 188  * fg_console is the current virtual console,
 189  * last_console is the last used one,
 190  * want_console is the console we want to switch to,
 191  * saved_* variants are for save/restore around kernel debugger enter/leave
 192  */
 193 int fg_console;
 194 int last_console;
 195 int want_console = -1;
 196 int saved_fg_console;
 197 int saved_last_console;
 198 int saved_want_console;
 199 int saved_vc_mode;
 200
 201 /*
 202  * For each existing display, we have a pointer to console currently visible
 203  * on that display, allowing consoles other than fg_console to be refreshed
 204  * appropriately. Unless the low-level driver supplies its own display_fg
 205  * variable, we use this one for the "master display".
 206  */
 207 static struct vc_data *master_display_fg;
 208
 209 /*
 210  * Unfortunately, we need to delay tty echo when we're currently writing to the
 211  * console since the code is (and always was) not re-entrant, so we schedule
 212  * all flip requests to process context with schedule-task() and run it from
 213  * console_callback().
 214  */
 215
 216 /*
 217  * For the same reason, we defer scrollback to the console callback.
 218  */
 219 static int scrollback_delta;
 220
 221 /*
 222  * Hook so that the power management routines can (un)blank
 223  * the console on our behalf.
 224  */
 225 int (*console_blank_hook)(int);
 226
 227 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 228 static int blank_state;
 229 static int blank_timer_expired;
 230 enum {
 231         blank_off = 0,
 232         blank_normal_wait,
 233         blank_vesa_wait,
 234 };
 235
 236 /*
 237  * Notifier list for console events.
 238  */
 239 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 240
 241 int register_vt_notifier(struct notifier_block *nb)
 242 {
 243         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 244 }
 245 EXPORT_SYMBOL_GPL(register_vt_notifier);
 246
 247 int unregister_vt_notifier(struct notifier_block *nb)
 248 {
 249         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 250 }
 251 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 252
 253 static void notify_write(struct vc_data *vc, unsigned int unicode)
 254 {
 255         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 256         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 257 }
 258
 259 static void notify_update(struct vc_data *vc)
 260 {
 261         struct vt_notifier_param param = { .vc = vc };
 262         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 263 }
 264 /*
 265  *      Low-Level Functions
 266  */
 267
 268 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 269
 270 #ifdef VT_BUF_VRAM_ONLY
 271 #define DO_UPDATE(vc)   0
 272 #else
 273 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 274 #endif
 275
 276 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 277 {
 278         unsigned short *p;
 279
 280         if (!viewed)
 281                 p = (unsigned short *)(vc->vc_origin + offset);
 282         else if (!vc->vc_sw->con_screen_pos)
 283                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 284         else
 285                 p = vc->vc_sw->con_screen_pos(vc, offset);
 286         return p;
 287 }
 288
 289 static inline void scrolldelta(int lines)
 290 {
 291         scrollback_delta += lines;
 292         schedule_console_callback();
 293 }
 294
 295 void schedule_console_callback(void)
 296 {
 297         schedule_work(&console_work);
 298 }
 299
 300 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 301 {
 302         unsigned short *d, *s;
 303
 304         if (t+nr >= b)
 305                 nr = b - t - 1;
 306         if (b > vc->vc_rows || t >= b || nr < 1)
 307                 return;
 308         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 309                 return;
 310         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 311         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 312         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 313         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 314                     vc->vc_size_row * nr);
 315 }
 316
 317 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 318 {
 319         unsigned short *s;
 320         unsigned int step;
 321
 322         if (t+nr >= b)
 323                 nr = b - t - 1;
 324         if (b > vc->vc_rows || t >= b || nr < 1)
 325                 return;
 326         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 327                 return;
 328         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 329         step = vc->vc_cols * nr;
 330         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 331         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 332 }
 333
 334 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 335 {
 336 #ifndef VT_BUF_VRAM_ONLY
 337         unsigned int xx, yy, offset;
 338         u16 *p;
 339
 340         p = (u16 *) start;
 341         if (!vc->vc_sw->con_getxy) {
 342                 offset = (start - vc->vc_origin) / 2;
 343                 xx = offset % vc->vc_cols;
 344                 yy = offset / vc->vc_cols;
 345         } else {
 346                 int nxx, nyy;
 347                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 348                 xx = nxx; yy = nyy;
 349         }
 350         for(;;) {
 351                 u16 attrib = scr_readw(p) & 0xff00;
 352                 int startx = xx;
 353                 u16 *q = p;
 354                 while (xx < vc->vc_cols && count) {
 355                         if (attrib != (scr_readw(p) & 0xff00)) {
 356                                 if (p > q)
 357                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 358                                 startx = xx;
 359                                 q = p;
 360                                 attrib = scr_readw(p) & 0xff00;
 361                         }
 362                         p++;
 363                         xx++;
 364                         count--;
 365                 }
 366                 if (p > q)
 367                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 368                 if (!count)
 369                         break;
 370                 xx = 0;
 371                 yy++;
 372                 if (vc->vc_sw->con_getxy) {
 373                         p = (u16 *)start;
 374                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 375                 }
 376         }
 377 #endif
 378 }
 379
 380 void update_region(struct vc_data *vc, unsigned long start, int count)
 381 {
 382         WARN_CONSOLE_UNLOCKED();
 383
 384         if (DO_UPDATE(vc)) {
 385                 hide_cursor(vc);
 386                 do_update_region(vc, start, count);
 387                 set_cursor(vc);
 388         }
 389 }
 390
 391 /* Structure of attributes is hardware-dependent */
 392
 393 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 394     u8 _underline, u8 _reverse, u8 _italic)
 395 {
 396         if (vc->vc_sw->con_build_attr)
 397                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 398                        _blink, _underline, _reverse, _italic);
 399
 400 #ifndef VT_BUF_VRAM_ONLY
 401 /*
 402  * ++roman: I completely changed the attribute format for monochrome
 403  * mode (!can_do_color). The formerly used MDA (monochrome display
 404  * adapter) format didn't allow the combination of certain effects.
 405  * Now the attribute is just a bit vector:
 406  *  Bit 0..1: intensity (0..2)
 407  *  Bit 2   : underline
 408  *  Bit 3   : reverse
 409  *  Bit 7   : blink
 410  */
 411         {
 412         u8 a = _color;
 413         if (!vc->vc_can_do_color)
 414                 return _intensity |
 415                        (_italic ? 2 : 0) |
 416                        (_underline ? 4 : 0) |
 417                        (_reverse ? 8 : 0) |
 418                        (_blink ? 0x80 : 0);
 419         if (_italic)
 420                 a = (a & 0xF0) | vc->vc_itcolor;
 421         else if (_underline)
 422                 a = (a & 0xf0) | vc->vc_ulcolor;
 423         else if (_intensity == 0)
 424                 a = (a & 0xf0) | vc->vc_ulcolor;
 425         if (_reverse)
 426                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 427         if (_blink)
 428                 a ^= 0x80;
 429         if (_intensity == 2)
 430                 a ^= 0x08;
 431         if (vc->vc_hi_font_mask == 0x100)
 432                 a <<= 1;
 433         return a;
 434         }
 435 #else
 436         return 0;
 437 #endif
 438 }
 439
 440 static void update_attr(struct vc_data *vc)
 441 {
 442         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 443                       vc->vc_blink, vc->vc_underline,
 444                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 445         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 446 }
 447
 448 /* Note: inverting the screen twice should revert to the original state */
 449 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 450 {
 451         unsigned short *p;
 452
 453         WARN_CONSOLE_UNLOCKED();
 454
 455         count /= 2;
 456         p = screenpos(vc, offset, viewed);
 457         if (vc->vc_sw->con_invert_region)
 458                 vc->vc_sw->con_invert_region(vc, p, count);
 459 #ifndef VT_BUF_VRAM_ONLY
 460         else {
 461                 u16 *q = p;
 462                 int cnt = count;
 463                 u16 a;
 464
 465                 if (!vc->vc_can_do_color) {
 466                         while (cnt--) {
 467                             a = scr_readw(q);
 468                             a ^= 0x0800;
 469                             scr_writew(a, q);
 470                             q++;
 471                         }
 472                 } else if (vc->vc_hi_font_mask == 0x100) {
 473                         while (cnt--) {
 474                                 a = scr_readw(q);
 475                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 476                                 scr_writew(a, q);
 477                                 q++;
 478                         }
 479                 } else {
 480                         while (cnt--) {
 481                                 a = scr_readw(q);
 482                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 483                                 scr_writew(a, q);
 484                                 q++;
 485                         }
 486                 }
 487         }
 488 #endif
 489         if (DO_UPDATE(vc))
 490                 do_update_region(vc, (unsigned long) p, count);
 491 }
 492
 493 /* used by selection: complement pointer position */
 494 void complement_pos(struct vc_data *vc, int offset)
 495 {
 496         static int old_offset = -1;
 497         static unsigned short old;
 498         static unsigned short oldx, oldy;
 499
 500         WARN_CONSOLE_UNLOCKED();
 501
 502         if (old_offset != -1 && old_offset >= 0 &&
 503             old_offset < vc->vc_screenbuf_size) {
 504                 scr_writew(old, screenpos(vc, old_offset, 1));
 505                 if (DO_UPDATE(vc))
 506                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 507         }
 508
 509         old_offset = offset;
 510
 511         if (offset != -1 && offset >= 0 &&
 512             offset < vc->vc_screenbuf_size) {
 513                 unsigned short new;
 514                 unsigned short *p;
 515                 p = screenpos(vc, offset, 1);
 516                 old = scr_readw(p);
 517                 new = old ^ vc->vc_complement_mask;
 518                 scr_writew(new, p);
 519                 if (DO_UPDATE(vc)) {
 520                         oldx = (offset >> 1) % vc->vc_cols;
 521                         oldy = (offset >> 1) / vc->vc_cols;
 522                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 523                 }
 524         }
 525
 526 }
 527
 528 static void insert_char(struct vc_data *vc, unsigned int nr)
 529 {
 530         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 531
 532         p = q + vc->vc_cols - nr - vc->vc_x;
 533         while (--p >= q)
 534                 scr_writew(scr_readw(p), p + nr);
 535         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 536         vc->vc_need_wrap = 0;
 537         if (DO_UPDATE(vc)) {
 538                 unsigned short oldattr = vc->vc_attr;
 539                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 540                                      vc->vc_cols - vc->vc_x - nr);
 541                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 542                 while (nr--)
 543                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 544                 vc->vc_attr = oldattr;
 545         }
 546 }
 547
 548 static void delete_char(struct vc_data *vc, unsigned int nr)
 549 {
 550         unsigned int i = vc->vc_x;
 551         unsigned short *p = (unsigned short *)vc->vc_pos;
 552
 553         while (++i <= vc->vc_cols - nr) {
 554                 scr_writew(scr_readw(p+nr), p);
 555                 p++;
 556         }
 557         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 558         vc->vc_need_wrap = 0;
 559         if (DO_UPDATE(vc)) {
 560                 unsigned short oldattr = vc->vc_attr;
 561                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 562                                      vc->vc_cols - vc->vc_x - nr);
 563                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 564                 while (nr--)
 565                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 566                                      vc->vc_cols - 1 - nr);
 567                 vc->vc_attr = oldattr;
 568         }
 569 }
 570
 571 static int softcursor_original;
 572
 573 static void add_softcursor(struct vc_data *vc)
 574 {
 575         int i = scr_readw((u16 *) vc->vc_pos);
 576         u32 type = vc->vc_cursor_type;
 577
 578         if (! (type & 0x10)) return;
 579         if (softcursor_original != -1) return;
 580         softcursor_original = i;
 581         i |= ((type >> 8) & 0xff00 );
 582         i ^= ((type) & 0xff00 );
 583         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 584         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 585         scr_writew(i, (u16 *) vc->vc_pos);
 586         if (DO_UPDATE(vc))
 587                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 588 }
 589
 590 static void hide_softcursor(struct vc_data *vc)
 591 {
 592         if (softcursor_original != -1) {
 593                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 594                 if (DO_UPDATE(vc))
 595                         vc->vc_sw->con_putc(vc, softcursor_original,
 596                                         vc->vc_y, vc->vc_x);
 597                 softcursor_original = -1;
 598         }
 599 }
 600
 601 static void hide_cursor(struct vc_data *vc)
 602 {
 603         if (vc == sel_cons)
 604                 clear_selection();
 605         vc->vc_sw->con_cursor(vc, CM_ERASE);
 606         hide_softcursor(vc);
 607 }
 608
 609 static void set_cursor(struct vc_data *vc)
 610 {
 611         if (!IS_FG(vc) || console_blanked ||
 612             vc->vc_mode == KD_GRAPHICS)
 613                 return;
 614         if (vc->vc_deccm) {
 615                 if (vc == sel_cons)
 616                         clear_selection();
 617                 add_softcursor(vc);
 618                 if ((vc->vc_cursor_type & 0x0f) != 1)
 619                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 620         } else
 621                 hide_cursor(vc);
 622 }
 623
 624 static void set_origin(struct vc_data *vc)
 625 {
 626         WARN_CONSOLE_UNLOCKED();
 627
 628         if (!CON_IS_VISIBLE(vc) ||
 629             !vc->vc_sw->con_set_origin ||
 630             !vc->vc_sw->con_set_origin(vc))
 631                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 632         vc->vc_visible_origin = vc->vc_origin;
 633         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 634         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 635 }
 636
 637 static inline void save_screen(struct vc_data *vc)
 638 {
 639         WARN_CONSOLE_UNLOCKED();
 640
 641         if (vc->vc_sw->con_save_screen)
 642                 vc->vc_sw->con_save_screen(vc);
 643 }
 644
 645 /*
 646  *      Redrawing of screen
 647  */
 648
 649 static void clear_buffer_attributes(struct vc_data *vc)
 650 {
 651         unsigned short *p = (unsigned short *)vc->vc_origin;
 652         int count = vc->vc_screenbuf_size / 2;
 653         int mask = vc->vc_hi_font_mask | 0xff;
 654
 655         for (; count > 0; count--, p++) {
 656                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 657         }
 658 }
 659
 660 void redraw_screen(struct vc_data *vc, int is_switch)
 661 {
 662         int redraw = 0;
 663
 664         WARN_CONSOLE_UNLOCKED();
 665
 666         if (!vc) {
 667                 /* strange ... */
 668                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 669                 return;
 670         }
 671
 672         if (is_switch) {
 673                 struct vc_data *old_vc = vc_cons[fg_console].d;
 674                 if (old_vc == vc)
 675                         return;
 676                 if (!CON_IS_VISIBLE(vc))
 677                         redraw = 1;
 678                 *vc->vc_display_fg = vc;
 679                 fg_console = vc->vc_num;
 680                 hide_cursor(old_vc);
 681                 if (!CON_IS_VISIBLE(old_vc)) {
 682                         save_screen(old_vc);
 683                         set_origin(old_vc);
 684                 }
 685         } else {
 686                 hide_cursor(vc);
 687                 redraw = 1;
 688         }
 689
 690         if (redraw) {
 691                 int update;
 692                 int old_was_color = vc->vc_can_do_color;
 693
 694                 set_origin(vc);
 695                 update = vc->vc_sw->con_switch(vc);
 696                 set_palette(vc);
 697                 /*
 698                  * If console changed from mono<->color, the best we can do
 699                  * is to clear the buffer attributes. As it currently stands,
 700                  * rebuilding new attributes from the old buffer is not doable
 701                  * without overly complex code.
 702                  */
 703                 if (old_was_color != vc->vc_can_do_color) {
 704                         update_attr(vc);
 705                         clear_buffer_attributes(vc);
 706                 }
 707                 if (update && vc->vc_mode != KD_GRAPHICS)
 708                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 709         }
 710         set_cursor(vc);
 711         if (is_switch) {
 712                 set_leds();
 713                 compute_shiftstate();
 714                 notify_update(vc);
 715         }
 716 }
 717
 718 /*
 719  *      Allocation, freeing and resizing of VTs.
 720  */
 721
 722 int vc_cons_allocated(unsigned int i)
 723 {
 724         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 725 }
 726
 727 static void visual_init(struct vc_data *vc, int num, int init)
 728 {
 729         /* ++Geert: vc->vc_sw->con_init determines console size */
 730         if (vc->vc_sw)
 731                 module_put(vc->vc_sw->owner);
 732         vc->vc_sw = conswitchp;
 733 #ifndef VT_SINGLE_DRIVER
 734         if (con_driver_map[num])
 735                 vc->vc_sw = con_driver_map[num];
 736 #endif
 737         __module_get(vc->vc_sw->owner);
 738         vc->vc_num = num;
 739         vc->vc_display_fg = &master_display_fg;
 740         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 741         vc->vc_uni_pagedir = 0;
 742         vc->vc_hi_font_mask = 0;
 743         vc->vc_complement_mask = 0;
 744         vc->vc_can_do_color = 0;
 745         vc->vc_sw->con_init(vc, init);
 746         if (!vc->vc_complement_mask)
 747                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 748         vc->vc_s_complement_mask = vc->vc_complement_mask;
 749         vc->vc_size_row = vc->vc_cols << 1;
 750         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 751 }
 752
 753 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 754 {
 755         WARN_CONSOLE_UNLOCKED();
 756
 757         if (currcons >= MAX_NR_CONSOLES)
 758                 return -ENXIO;
 759         if (!vc_cons[currcons].d) {
 760             struct vc_data *vc;
 761             struct vt_notifier_param param;
 762
 763             /* prevent users from taking too much memory */
 764             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 765               return -EPERM;
 766
 767             /* due to the granularity of kmalloc, we waste some memory here */
 768             /* the alloc is done in two steps, to optimize the common situation
 769                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 770             /* although the numbers above are not valid since long ago, the
 771                point is still up-to-date and the comment still has its value
 772                even if only as a historical artifact.  --mj, July 1998 */
 773             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 774             if (!vc)
 775                 return -ENOMEM;
 776             vc_cons[currcons].d = vc;
 777             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 778             visual_init(vc, currcons, 1);
 779             if (!*vc->vc_uni_pagedir_loc)
 780                 con_set_default_unimap(vc);
 781             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 782             if (!vc->vc_screenbuf) {
 783                 kfree(vc);
 784                 vc_cons[currcons].d = NULL;
 785                 return -ENOMEM;
 786             }
 787
 788             /* If no drivers have overridden us and the user didn't pass a
 789                boot option, default to displaying the cursor */
 790             if (global_cursor_default == -1)
 791                     global_cursor_default = 1;
 792
 793             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 794             vcs_make_sysfs(currcons);
 795             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 796         }
 797         return 0;
 798 }
 799
 800 static inline int resize_screen(struct vc_data *vc, int width, int height,
 801                                 int user)
 802 {
 803         /* Resizes the resolution of the display adapater */
 804         int err = 0;
 805
 806         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 807                 err = vc->vc_sw->con_resize(vc, width, height, user);
 808
 809         return err;
 810 }
 811
 812 /*
 813  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 814  * [this is to be used together with some user program
 815  * like resize that changes the hardware videomode]
 816  */
 817 #define VC_RESIZE_MAXCOL (32767)
 818 #define VC_RESIZE_MAXROW (32767)
 819
 820 /**
 821  *      vc_do_resize    -       resizing method for the tty
 822  *      @tty: tty being resized
 823  *      @real_tty: real tty (different to tty if a pty/tty pair)
 824  *      @vc: virtual console private data
 825  *      @cols: columns
 826  *      @lines: lines
 827  *
 828  *      Resize a virtual console, clipping according to the actual constraints.
 829  *      If the caller passes a tty structure then update the termios winsize
 830  *      information and perform any necessary signal handling.
 831  *
 832  *      Caller must hold the console semaphore. Takes the termios mutex and
 833  *      ctrl_lock of the tty IFF a tty is passed.
 834  */
 835
 836 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 837                                 unsigned int cols, unsigned int lines)
 838 {
 839         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 840         unsigned long end;
 841         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 842         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 843         unsigned int user;
 844         unsigned short *newscreen;
 845
 846         WARN_CONSOLE_UNLOCKED();
 847
 848         if (!vc)
 849                 return -ENXIO;
 850
 851         user = vc->vc_resize_user;
 852         vc->vc_resize_user = 0;
 853
 854         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 855                 return -EINVAL;
 856
 857         new_cols = (cols ? cols : vc->vc_cols);
 858         new_rows = (lines ? lines : vc->vc_rows);
 859         new_row_size = new_cols << 1;
 860         new_screen_size = new_row_size * new_rows;
 861
 862         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 863                 return 0;
 864
 865         newscreen = kmalloc(new_screen_size, GFP_USER);
 866         if (!newscreen)
 867                 return -ENOMEM;
 868
 869         old_rows = vc->vc_rows;
 870         old_cols = vc->vc_cols;
 871         old_row_size = vc->vc_size_row;
 872         old_screen_size = vc->vc_screenbuf_size;
 873
 874         err = resize_screen(vc, new_cols, new_rows, user);
 875         if (err) {
 876                 kfree(newscreen);
 877                 return err;
 878         }
 879
 880         vc->vc_rows = new_rows;
 881         vc->vc_cols = new_cols;
 882         vc->vc_size_row = new_row_size;
 883         vc->vc_screenbuf_size = new_screen_size;
 884
 885         rlth = min(old_row_size, new_row_size);
 886         rrem = new_row_size - rlth;
 887         old_origin = vc->vc_origin;
 888         new_origin = (long) newscreen;
 889         new_scr_end = new_origin + new_screen_size;
 890
 891         if (vc->vc_y > new_rows) {
 892                 if (old_rows - vc->vc_y < new_rows) {
 893                         /*
 894                          * Cursor near the bottom, copy contents from the
 895                          * bottom of buffer
 896                          */
 897                         old_origin += (old_rows - new_rows) * old_row_size;
 898                         end = vc->vc_scr_end;
 899                 } else {
 900                         /*
 901                          * Cursor is in no man's land, copy 1/2 screenful
 902                          * from the top and bottom of cursor position
 903                          */
 904                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 905                         end = old_origin + (old_row_size * new_rows);
 906                 }
 907         } else
 908                 /*
 909                  * Cursor near the top, copy contents from the top of buffer
 910                  */
 911                 end = (old_rows > new_rows) ? old_origin +
 912                         (old_row_size * new_rows) :
 913                         vc->vc_scr_end;
 914
 915         update_attr(vc);
 916
 917         while (old_origin < end) {
 918                 scr_memcpyw((unsigned short *) new_origin,
 919                             (unsigned short *) old_origin, rlth);
 920                 if (rrem)
 921                         scr_memsetw((void *)(new_origin + rlth),
 922                                     vc->vc_video_erase_char, rrem);
 923                 old_origin += old_row_size;
 924                 new_origin += new_row_size;
 925         }
 926         if (new_scr_end > new_origin)
 927                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 928                             new_scr_end - new_origin);
 929         kfree(vc->vc_screenbuf);
 930         vc->vc_screenbuf = newscreen;
 931         vc->vc_screenbuf_size = new_screen_size;
 932         set_origin(vc);
 933
 934         /* do part of a reset_terminal() */
 935         vc->vc_top = 0;
 936         vc->vc_bottom = vc->vc_rows;
 937         gotoxy(vc, vc->vc_x, vc->vc_y);
 938         save_cur(vc);
 939
 940         if (tty) {
 941                 /* Rewrite the requested winsize data with the actual
 942                    resulting sizes */
 943                 struct winsize ws;
 944                 memset(&ws, 0, sizeof(ws));
 945                 ws.ws_row = vc->vc_rows;
 946                 ws.ws_col = vc->vc_cols;
 947                 ws.ws_ypixel = vc->vc_scan_lines;
 948                 tty_do_resize(tty, &ws);
 949         }
 950
 951         if (CON_IS_VISIBLE(vc))
 952                 update_screen(vc);
 953         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 954         return err;
 955 }
 956
 957 /**
 958  *      vc_resize               -       resize a VT
 959  *      @vc: virtual console
 960  *      @cols: columns
 961  *      @rows: rows
 962  *
 963  *      Resize a virtual console as seen from the console end of things. We
 964  *      use the common vc_do_resize methods to update the structures. The
 965  *      caller must hold the console sem to protect console internals and
 966  *      vc->vc_tty
 967  */
 968
 969 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 970 {
 971         return vc_do_resize(vc->vc_tty, vc, cols, rows);
 972 }
 973
 974 /**
 975  *      vt_resize               -       resize a VT
 976  *      @tty: tty to resize
 977  *      @ws: winsize attributes
 978  *
 979  *      Resize a virtual terminal. This is called by the tty layer as we
 980  *      register our own handler for resizing. The mutual helper does all
 981  *      the actual work.
 982  *
 983  *      Takes the console sem and the called methods then take the tty
 984  *      termios_mutex and the tty ctrl_lock in that order.
 985  */
 986 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 987 {
 988         struct vc_data *vc = tty->driver_data;
 989         int ret;
 990
 991         acquire_console_sem();
 992         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 993         release_console_sem();
 994         return ret;
 995 }
 996
 997 void vc_deallocate(unsigned int currcons)
 998 {
 999         WARN_CONSOLE_UNLOCKED();
1000
1001         if (vc_cons_allocated(currcons)) {
1002                 struct vc_data *vc = vc_cons[currcons].d;
1003                 struct vt_notifier_param param = { .vc = vc };
1004
1005                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1006                 vcs_remove_sysfs(currcons);
1007                 vc->vc_sw->con_deinit(vc);
1008                 put_pid(vc->vt_pid);
1009                 module_put(vc->vc_sw->owner);
1010                 kfree(vc->vc_screenbuf);
1011                 if (currcons >= MIN_NR_CONSOLES)
1012                         kfree(vc);
1013                 vc_cons[currcons].d = NULL;
1014         }
1015 }
1016
1017 /*
1018  *      VT102 emulator
1019  */
1020
1021 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1022 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1023 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1024
1025 #define decarm          VC_REPEAT
1026 #define decckm          VC_CKMODE
1027 #define kbdapplic       VC_APPLIC
1028 #define lnm             VC_CRLF
1029
1030 /*
1031  * this is what the terminal answers to a ESC-Z or csi0c query.
1032  */
1033 #define VT100ID "\033[?1;2c"
1034 #define VT102ID "\033[?6c"
1035
1036 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1037                                        8,12,10,14, 9,13,11,15 };
1038
1039 /* the default colour table, for VGA+ colour systems */
1040 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1041     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1042 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1043     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1044 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1045     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1046
1047 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1048 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1049 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1050
1051 /*
1052  * gotoxy() must verify all boundaries, because the arguments
1053  * might also be negative. If the given position is out of
1054  * bounds, the cursor is placed at the nearest margin.
1055  */
1056 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1057 {
1058         int min_y, max_y;
1059
1060         if (new_x < 0)
1061                 vc->vc_x = 0;
1062         else {
1063                 if (new_x >= vc->vc_cols)
1064                         vc->vc_x = vc->vc_cols - 1;
1065                 else
1066                         vc->vc_x = new_x;
1067         }
1068
1069         if (vc->vc_decom) {
1070                 min_y = vc->vc_top;
1071                 max_y = vc->vc_bottom;
1072         } else {
1073                 min_y = 0;
1074                 max_y = vc->vc_rows;
1075         }
1076         if (new_y < min_y)
1077                 vc->vc_y = min_y;
1078         else if (new_y >= max_y)
1079                 vc->vc_y = max_y - 1;
1080         else
1081                 vc->vc_y = new_y;
1082         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1083         vc->vc_need_wrap = 0;
1084 }
1085
1086 /* for absolute user moves, when decom is set */
1087 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1088 {
1089         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1090 }
1091
1092 void scrollback(struct vc_data *vc, int lines)
1093 {
1094         if (!lines)
1095                 lines = vc->vc_rows / 2;
1096         scrolldelta(-lines);
1097 }
1098
1099 void scrollfront(struct vc_data *vc, int lines)
1100 {
1101         if (!lines)
1102                 lines = vc->vc_rows / 2;
1103         scrolldelta(lines);
1104 }
1105
1106 static void lf(struct vc_data *vc)
1107 {
1108         /* don't scroll if above bottom of scrolling region, or
1109          * if below scrolling region
1110          */
1111         if (vc->vc_y + 1 == vc->vc_bottom)
1112                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1113         else if (vc->vc_y < vc->vc_rows - 1) {
1114                 vc->vc_y++;
1115                 vc->vc_pos += vc->vc_size_row;
1116         }
1117         vc->vc_need_wrap = 0;
1118         notify_write(vc, '\n');
1119 }
1120
1121 static void ri(struct vc_data *vc)
1122 {
1123         /* don't scroll if below top of scrolling region, or
1124          * if above scrolling region
1125          */
1126         if (vc->vc_y == vc->vc_top)
1127                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1128         else if (vc->vc_y > 0) {
1129                 vc->vc_y--;
1130                 vc->vc_pos -= vc->vc_size_row;
1131         }
1132         vc->vc_need_wrap = 0;
1133 }
1134
1135 static inline void cr(struct vc_data *vc)
1136 {
1137         vc->vc_pos -= vc->vc_x << 1;
1138         vc->vc_need_wrap = vc->vc_x = 0;
1139         notify_write(vc, '\r');
1140 }
1141
1142 static inline void bs(struct vc_data *vc)
1143 {
1144         if (vc->vc_x) {
1145                 vc->vc_pos -= 2;
1146                 vc->vc_x--;
1147                 vc->vc_need_wrap = 0;
1148                 notify_write(vc, '\b');
1149         }
1150 }
1151
1152 static inline void del(struct vc_data *vc)
1153 {
1154         /* ignored */
1155 }
1156
1157 static void csi_J(struct vc_data *vc, int vpar)
1158 {
1159         unsigned int count;
1160         unsigned short * start;
1161
1162         switch (vpar) {
1163                 case 0: /* erase from cursor to end of display */
1164                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1165                         start = (unsigned short *)vc->vc_pos;
1166                         if (DO_UPDATE(vc)) {
1167                                 /* do in two stages */
1168                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1169                                               vc->vc_cols - vc->vc_x);
1170                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1171                                               vc->vc_rows - vc->vc_y - 1,
1172                                               vc->vc_cols);
1173                         }
1174                         break;
1175                 case 1: /* erase from start to cursor */
1176                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1177                         start = (unsigned short *)vc->vc_origin;
1178                         if (DO_UPDATE(vc)) {
1179                                 /* do in two stages */
1180                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1181                                               vc->vc_cols);
1182                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1183                                               vc->vc_x + 1);
1184                         }
1185                         break;
1186                 case 2: /* erase whole display */
1187                         count = vc->vc_cols * vc->vc_rows;
1188                         start = (unsigned short *)vc->vc_origin;
1189                         if (DO_UPDATE(vc))
1190                                 vc->vc_sw->con_clear(vc, 0, 0,
1191                                               vc->vc_rows,
1192                                               vc->vc_cols);
1193                         break;
1194                 default:
1195                         return;
1196         }
1197         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1198         vc->vc_need_wrap = 0;
1199 }
1200
1201 static void csi_K(struct vc_data *vc, int vpar)
1202 {
1203         unsigned int count;
1204         unsigned short * start;
1205
1206         switch (vpar) {
1207                 case 0: /* erase from cursor to end of line */
1208                         count = vc->vc_cols - vc->vc_x;
1209                         start = (unsigned short *)vc->vc_pos;
1210                         if (DO_UPDATE(vc))
1211                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1212                                                      vc->vc_cols - vc->vc_x);
1213                         break;
1214                 case 1: /* erase from start of line to cursor */
1215                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1216                         count = vc->vc_x + 1;
1217                         if (DO_UPDATE(vc))
1218                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1219                                                      vc->vc_x + 1);
1220                         break;
1221                 case 2: /* erase whole line */
1222                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1223                         count = vc->vc_cols;
1224                         if (DO_UPDATE(vc))
1225                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1226                                               vc->vc_cols);
1227                         break;
1228                 default:
1229                         return;
1230         }
1231         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1232         vc->vc_need_wrap = 0;
1233 }
1234
1235 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1236 {                                         /* not vt100? */
1237         int count;
1238
1239         if (!vpar)
1240                 vpar++;
1241         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1242
1243         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1244         if (DO_UPDATE(vc))
1245                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1246         vc->vc_need_wrap = 0;
1247 }
1248
1249 static void default_attr(struct vc_data *vc)
1250 {
1251         vc->vc_intensity = 1;
1252         vc->vc_italic = 0;
1253         vc->vc_underline = 0;
1254         vc->vc_reverse = 0;
1255         vc->vc_blink = 0;
1256         vc->vc_color = vc->vc_def_color;
1257 }
1258
1259 /* console_sem is held */
1260 static void csi_m(struct vc_data *vc)
1261 {
1262         int i;
1263
1264         for (i = 0; i <= vc->vc_npar; i++)
1265                 switch (vc->vc_par[i]) {
1266                         case 0: /* all attributes off */
1267                                 default_attr(vc);
1268                                 break;
1269                         case 1:
1270                                 vc->vc_intensity = 2;
1271                                 break;
1272                         case 2:
1273                                 vc->vc_intensity = 0;
1274                                 break;
1275                         case 3:
1276                                 vc->vc_italic = 1;
1277                                 break;
1278                         case 4:
1279                                 vc->vc_underline = 1;
1280                                 break;
1281                         case 5:
1282                                 vc->vc_blink = 1;
1283                                 break;
1284                         case 7:
1285                                 vc->vc_reverse = 1;
1286                                 break;
1287                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1288                                   * Select primary font, don't display
1289                                   * control chars if defined, don't set
1290                                   * bit 8 on output.
1291                                   */
1292                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1293                                                 ? vc->vc_G0_charset
1294                                                 : vc->vc_G1_charset, vc);
1295                                 vc->vc_disp_ctrl = 0;
1296                                 vc->vc_toggle_meta = 0;
1297                                 break;
1298                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1299                                   * Select first alternate font, lets
1300                                   * chars < 32 be displayed as ROM chars.
1301                                   */
1302                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1303                                 vc->vc_disp_ctrl = 1;
1304                                 vc->vc_toggle_meta = 0;
1305                                 break;
1306                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1307                                   * Select second alternate font, toggle
1308                                   * high bit before displaying as ROM char.
1309                                   */
1310                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1311                                 vc->vc_disp_ctrl = 1;
1312                                 vc->vc_toggle_meta = 1;
1313                                 break;
1314                         case 21:
1315                         case 22:
1316                                 vc->vc_intensity = 1;
1317                                 break;
1318                         case 23:
1319                                 vc->vc_italic = 0;
1320                                 break;
1321                         case 24:
1322                                 vc->vc_underline = 0;
1323                                 break;
1324                         case 25:
1325                                 vc->vc_blink = 0;
1326                                 break;
1327                         case 27:
1328                                 vc->vc_reverse = 0;
1329                                 break;
1330                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1331                                   * Enables underscore, white foreground
1332                                   * with white underscore (Linux - use
1333                                   * default foreground).
1334                                   */
1335                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1336                                 vc->vc_underline = 1;
1337                                 break;
1338                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1339                                   * Disable underline option.
1340                                   * Reset colour to default? It did this
1341                                   * before...
1342                                   */
1343                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1344                                 vc->vc_underline = 0;
1345                                 break;
1346                         case 49:
1347                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1348                                 break;
1349                         default:
1350                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1351                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1352                                                 | (vc->vc_color & 0xf0);
1353                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1354                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1355                                                 | (vc->vc_color & 0x0f);
1356                                 break;
1357                 }
1358         update_attr(vc);
1359 }
1360
1361 static void respond_string(const char *p, struct tty_struct *tty)
1362 {
1363         while (*p) {
1364                 tty_insert_flip_char(tty, *p, 0);
1365                 p++;
1366         }
1367         con_schedule_flip(tty);
1368 }
1369
1370 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1371 {
1372         char buf[40];
1373
1374         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1375         respond_string(buf, tty);
1376 }
1377
1378 static inline void status_report(struct tty_struct *tty)
1379 {
1380         respond_string("\033[0n", tty); /* Terminal ok */
1381 }
1382
1383 static inline void respond_ID(struct tty_struct * tty)
1384 {
1385         respond_string(VT102ID, tty);
1386 }
1387
1388 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1389 {
1390         char buf[8];
1391
1392         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1393                 (char)('!' + mry));
1394         respond_string(buf, tty);
1395 }
1396
1397 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1398 int mouse_reporting(void)
1399 {
1400         return vc_cons[fg_console].d->vc_report_mouse;
1401 }
1402
1403 /* console_sem is held */
1404 static void set_mode(struct vc_data *vc, int on_off)
1405 {
1406         int i;
1407
1408         for (i = 0; i <= vc->vc_npar; i++)
1409                 if (vc->vc_ques) {
1410                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1411                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1412                                 if (on_off)
1413                                         set_kbd(vc, decckm);
1414                                 else
1415                                         clr_kbd(vc, decckm);
1416                                 break;
1417                         case 3: /* 80/132 mode switch unimplemented */
1418                                 vc->vc_deccolm = on_off;
1419 #if 0
1420                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1421                                 /* this alone does not suffice; some user mode
1422                                    utility has to change the hardware regs */
1423 #endif
1424                                 break;
1425                         case 5:                 /* Inverted screen on/off */
1426                                 if (vc->vc_decscnm != on_off) {
1427                                         vc->vc_decscnm = on_off;
1428                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1429                                         update_attr(vc);
1430                                 }
1431                                 break;
1432                         case 6:                 /* Origin relative/absolute */
1433                                 vc->vc_decom = on_off;
1434                                 gotoxay(vc, 0, 0);
1435                                 break;
1436                         case 7:                 /* Autowrap on/off */
1437                                 vc->vc_decawm = on_off;
1438                                 break;
1439                         case 8:                 /* Autorepeat on/off */
1440                                 if (on_off)
1441                                         set_kbd(vc, decarm);
1442                                 else
1443                                         clr_kbd(vc, decarm);
1444                                 break;
1445                         case 9:
1446                                 vc->vc_report_mouse = on_off ? 1 : 0;
1447                                 break;
1448                         case 25:                /* Cursor on/off */
1449                                 vc->vc_deccm = on_off;
1450                                 break;
1451                         case 1000:
1452                                 vc->vc_report_mouse = on_off ? 2 : 0;
1453                                 break;
1454                         }
1455                 } else {
1456                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1457                         case 3:                 /* Monitor (display ctrls) */
1458                                 vc->vc_disp_ctrl = on_off;
1459                                 break;
1460                         case 4:                 /* Insert Mode on/off */
1461                                 vc->vc_decim = on_off;
1462                                 break;
1463                         case 20:                /* Lf, Enter == CrLf/Lf */
1464                                 if (on_off)
1465                                         set_kbd(vc, lnm);
1466                                 else
1467                                         clr_kbd(vc, lnm);
1468                                 break;
1469                         }
1470                 }
1471 }
1472
1473 /* console_sem is held */
1474 static void setterm_command(struct vc_data *vc)
1475 {
1476         switch(vc->vc_par[0]) {
1477                 case 1: /* set color for underline mode */
1478                         if (vc->vc_can_do_color &&
1479                                         vc->vc_par[1] < 16) {
1480                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1481                                 if (vc->vc_underline)
1482                                         update_attr(vc);
1483                         }
1484                         break;
1485                 case 2: /* set color for half intensity mode */
1486                         if (vc->vc_can_do_color &&
1487                                         vc->vc_par[1] < 16) {
1488                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1489                                 if (vc->vc_intensity == 0)
1490                                         update_attr(vc);
1491                         }
1492                         break;
1493                 case 8: /* store colors as defaults */
1494                         vc->vc_def_color = vc->vc_attr;
1495                         if (vc->vc_hi_font_mask == 0x100)
1496                                 vc->vc_def_color >>= 1;
1497                         default_attr(vc);
1498                         update_attr(vc);
1499                         break;
1500                 case 9: /* set blanking interval */
1501                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1502                         poke_blanked_console();
1503                         break;
1504                 case 10: /* set bell frequency in Hz */
1505                         if (vc->vc_npar >= 1)
1506                                 vc->vc_bell_pitch = vc->vc_par[1];
1507                         else
1508                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1509                         break;
1510                 case 11: /* set bell duration in msec */
1511                         if (vc->vc_npar >= 1)
1512                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1513                                         vc->vc_par[1] * HZ / 1000 : 0;
1514                         else
1515                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1516                         break;
1517                 case 12: /* bring specified console to the front */
1518                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1519                                 set_console(vc->vc_par[1] - 1);
1520                         break;
1521                 case 13: /* unblank the screen */
1522                         poke_blanked_console();
1523                         break;
1524                 case 14: /* set vesa powerdown interval */
1525                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1526                         break;
1527                 case 15: /* activate the previous console */
1528                         set_console(last_console);
1529                         break;
1530         }
1531 }
1532
1533 /* console_sem is held */
1534 static void csi_at(struct vc_data *vc, unsigned int nr)
1535 {
1536         if (nr > vc->vc_cols - vc->vc_x)
1537                 nr = vc->vc_cols - vc->vc_x;
1538         else if (!nr)
1539                 nr = 1;
1540         insert_char(vc, nr);
1541 }
1542
1543 /* console_sem is held */
1544 static void csi_L(struct vc_data *vc, unsigned int nr)
1545 {
1546         if (nr > vc->vc_rows - vc->vc_y)
1547                 nr = vc->vc_rows - vc->vc_y;
1548         else if (!nr)
1549                 nr = 1;
1550         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1551         vc->vc_need_wrap = 0;
1552 }
1553
1554 /* console_sem is held */
1555 static void csi_P(struct vc_data *vc, unsigned int nr)
1556 {
1557         if (nr > vc->vc_cols - vc->vc_x)
1558                 nr = vc->vc_cols - vc->vc_x;
1559         else if (!nr)
1560                 nr = 1;
1561         delete_char(vc, nr);
1562 }
1563
1564 /* console_sem is held */
1565 static void csi_M(struct vc_data *vc, unsigned int nr)
1566 {
1567         if (nr > vc->vc_rows - vc->vc_y)
1568                 nr = vc->vc_rows - vc->vc_y;
1569         else if (!nr)
1570                 nr=1;
1571         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1572         vc->vc_need_wrap = 0;
1573 }
1574
1575 /* console_sem is held (except via vc_init->reset_terminal */
1576 static void save_cur(struct vc_data *vc)
1577 {
1578         vc->vc_saved_x          = vc->vc_x;
1579         vc->vc_saved_y          = vc->vc_y;
1580         vc->vc_s_intensity      = vc->vc_intensity;
1581         vc->vc_s_italic         = vc->vc_italic;
1582         vc->vc_s_underline      = vc->vc_underline;
1583         vc->vc_s_blink          = vc->vc_blink;
1584         vc->vc_s_reverse        = vc->vc_reverse;
1585         vc->vc_s_charset        = vc->vc_charset;
1586         vc->vc_s_color          = vc->vc_color;
1587         vc->vc_saved_G0         = vc->vc_G0_charset;
1588         vc->vc_saved_G1         = vc->vc_G1_charset;
1589 }
1590
1591 /* console_sem is held */
1592 static void restore_cur(struct vc_data *vc)
1593 {
1594         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1595         vc->vc_intensity        = vc->vc_s_intensity;
1596         vc->vc_italic           = vc->vc_s_italic;
1597         vc->vc_underline        = vc->vc_s_underline;
1598         vc->vc_blink            = vc->vc_s_blink;
1599         vc->vc_reverse          = vc->vc_s_reverse;
1600         vc->vc_charset          = vc->vc_s_charset;
1601         vc->vc_color            = vc->vc_s_color;
1602         vc->vc_G0_charset       = vc->vc_saved_G0;
1603         vc->vc_G1_charset       = vc->vc_saved_G1;
1604         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1605         update_attr(vc);
1606         vc->vc_need_wrap = 0;
1607 }
1608
1609 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1610         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1611         ESpalette };
1612
1613 /* console_sem is held (except via vc_init()) */
1614 static void reset_terminal(struct vc_data *vc, int do_clear)
1615 {
1616         vc->vc_top              = 0;
1617         vc->vc_bottom           = vc->vc_rows;
1618         vc->vc_state            = ESnormal;
1619         vc->vc_ques             = 0;
1620         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1621         vc->vc_G0_charset       = LAT1_MAP;
1622         vc->vc_G1_charset       = GRAF_MAP;
1623         vc->vc_charset          = 0;
1624         vc->vc_need_wrap        = 0;
1625         vc->vc_report_mouse     = 0;
1626         vc->vc_utf              = default_utf8;
1627         vc->vc_utf_count        = 0;
1628
1629         vc->vc_disp_ctrl        = 0;
1630         vc->vc_toggle_meta      = 0;
1631
1632         vc->vc_decscnm          = 0;
1633         vc->vc_decom            = 0;
1634         vc->vc_decawm           = 1;
1635         vc->vc_deccm            = global_cursor_default;
1636         vc->vc_decim            = 0;
1637
1638         set_kbd(vc, decarm);
1639         clr_kbd(vc, decckm);
1640         clr_kbd(vc, kbdapplic);
1641         clr_kbd(vc, lnm);
1642         kbd_table[vc->vc_num].lockstate = 0;
1643         kbd_table[vc->vc_num].slockstate = 0;
1644         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1645         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1646         /* do not do set_leds here because this causes an endless tasklet loop
1647            when the keyboard hasn't been initialized yet */
1648
1649         vc->vc_cursor_type = cur_default;
1650         vc->vc_complement_mask = vc->vc_s_complement_mask;
1651
1652         default_attr(vc);
1653         update_attr(vc);
1654
1655         vc->vc_tab_stop[0]      = 0x01010100;
1656         vc->vc_tab_stop[1]      =
1657         vc->vc_tab_stop[2]      =
1658         vc->vc_tab_stop[3]      =
1659         vc->vc_tab_stop[4]      =
1660         vc->vc_tab_stop[5]      =
1661         vc->vc_tab_stop[6]      =
1662         vc->vc_tab_stop[7]      = 0x01010101;
1663
1664         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1665         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1666
1667         gotoxy(vc, 0, 0);
1668         save_cur(vc);
1669         if (do_clear)
1670             csi_J(vc, 2);
1671 }
1672
1673 /* console_sem is held */
1674 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1675 {
1676         /*
1677          *  Control characters can be used in the _middle_
1678          *  of an escape sequence.
1679          */
1680         switch (c) {
1681         case 0:
1682                 return;
1683         case 7:
1684                 if (vc->vc_bell_duration)
1685                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1686                 return;
1687         case 8:
1688                 bs(vc);
1689                 return;
1690         case 9:
1691                 vc->vc_pos -= (vc->vc_x << 1);
1692                 while (vc->vc_x < vc->vc_cols - 1) {
1693                         vc->vc_x++;
1694                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1695                                 break;
1696                 }
1697                 vc->vc_pos += (vc->vc_x << 1);
1698                 notify_write(vc, '\t');
1699                 return;
1700         case 10: case 11: case 12:
1701                 lf(vc);
1702                 if (!is_kbd(vc, lnm))
1703                         return;
1704         case 13:
1705                 cr(vc);
1706                 return;
1707         case 14:
1708                 vc->vc_charset = 1;
1709                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1710                 vc->vc_disp_ctrl = 1;
1711                 return;
1712         case 15:
1713                 vc->vc_charset = 0;
1714                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1715                 vc->vc_disp_ctrl = 0;
1716                 return;
1717         case 24: case 26:
1718                 vc->vc_state = ESnormal;
1719                 return;
1720         case 27:
1721                 vc->vc_state = ESesc;
1722                 return;
1723         case 127:
1724                 del(vc);
1725                 return;
1726         case 128+27:
1727                 vc->vc_state = ESsquare;
1728                 return;
1729         }
1730         switch(vc->vc_state) {
1731         case ESesc:
1732                 vc->vc_state = ESnormal;
1733                 switch (c) {
1734                 case '[':
1735                         vc->vc_state = ESsquare;
1736                         return;
1737                 case ']':
1738                         vc->vc_state = ESnonstd;
1739                         return;
1740                 case '%':
1741                         vc->vc_state = ESpercent;
1742                         return;
1743                 case 'E':
1744                         cr(vc);
1745                         lf(vc);
1746                         return;
1747                 case 'M':
1748                         ri(vc);
1749                         return;
1750                 case 'D':
1751                         lf(vc);
1752                         return;
1753                 case 'H':
1754                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1755                         return;
1756                 case 'Z':
1757                         respond_ID(tty);
1758                         return;
1759                 case '7':
1760                         save_cur(vc);
1761                         return;
1762                 case '8':
1763                         restore_cur(vc);
1764                         return;
1765                 case '(':
1766                         vc->vc_state = ESsetG0;
1767                         return;
1768                 case ')':
1769                         vc->vc_state = ESsetG1;
1770                         return;
1771                 case '#':
1772                         vc->vc_state = EShash;
1773                         return;
1774                 case 'c':
1775                         reset_terminal(vc, 1);
1776                         return;
1777                 case '>':  /* Numeric keypad */
1778                         clr_kbd(vc, kbdapplic);
1779                         return;
1780                 case '=':  /* Appl. keypad */
1781                         set_kbd(vc, kbdapplic);
1782                         return;
1783                 }
1784                 return;
1785         case ESnonstd:
1786                 if (c=='P') {   /* palette escape sequence */
1787                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1788                                 vc->vc_par[vc->vc_npar] = 0;
1789                         vc->vc_npar = 0;
1790                         vc->vc_state = ESpalette;
1791                         return;
1792                 } else if (c=='R') {   /* reset palette */
1793                         reset_palette(vc);
1794                         vc->vc_state = ESnormal;
1795                 } else
1796                         vc->vc_state = ESnormal;
1797                 return;
1798         case ESpalette:
1799                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1800                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1801                         if (vc->vc_npar == 7) {
1802                                 int i = vc->vc_par[0] * 3, j = 1;
1803                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1804                                 vc->vc_palette[i++] += vc->vc_par[j++];
1805                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1806                                 vc->vc_palette[i++] += vc->vc_par[j++];
1807                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1808                                 vc->vc_palette[i] += vc->vc_par[j];
1809                                 set_palette(vc);
1810                                 vc->vc_state = ESnormal;
1811                         }
1812                 } else
1813                         vc->vc_state = ESnormal;
1814                 return;
1815         case ESsquare:
1816                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1817                         vc->vc_par[vc->vc_npar] = 0;
1818                 vc->vc_npar = 0;
1819                 vc->vc_state = ESgetpars;
1820                 if (c == '[') { /* Function key */
1821                         vc->vc_state=ESfunckey;
1822                         return;
1823                 }
1824                 vc->vc_ques = (c == '?');
1825                 if (vc->vc_ques)
1826                         return;
1827         case ESgetpars:
1828                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1829                         vc->vc_npar++;
1830                         return;
1831                 } else if (c>='0' && c<='9') {
1832                         vc->vc_par[vc->vc_npar] *= 10;
1833                         vc->vc_par[vc->vc_npar] += c - '0';
1834                         return;
1835                 } else
1836                         vc->vc_state = ESgotpars;
1837         case ESgotpars:
1838                 vc->vc_state = ESnormal;
1839                 switch(c) {
1840                 case 'h':
1841                         set_mode(vc, 1);
1842                         return;
1843                 case 'l':
1844                         set_mode(vc, 0);
1845                         return;
1846                 case 'c':
1847                         if (vc->vc_ques) {
1848                                 if (vc->vc_par[0])
1849                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1850                                 else
1851                                         vc->vc_cursor_type = cur_default;
1852                                 return;
1853                         }
1854                         break;
1855                 case 'm':
1856                         if (vc->vc_ques) {
1857                                 clear_selection();
1858                                 if (vc->vc_par[0])
1859                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1860                                 else
1861                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1862                                 return;
1863                         }
1864                         break;
1865                 case 'n':
1866                         if (!vc->vc_ques) {
1867                                 if (vc->vc_par[0] == 5)
1868                                         status_report(tty);
1869                                 else if (vc->vc_par[0] == 6)
1870                                         cursor_report(vc, tty);
1871                         }
1872                         return;
1873                 }
1874                 if (vc->vc_ques) {
1875                         vc->vc_ques = 0;
1876                         return;
1877                 }
1878                 switch(c) {
1879                 case 'G': case '`':
1880                         if (vc->vc_par[0])
1881                                 vc->vc_par[0]--;
1882                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1883                         return;
1884                 case 'A':
1885                         if (!vc->vc_par[0])
1886                                 vc->vc_par[0]++;
1887                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1888                         return;
1889                 case 'B': case 'e':
1890                         if (!vc->vc_par[0])
1891                                 vc->vc_par[0]++;
1892                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1893                         return;
1894                 case 'C': case 'a':
1895                         if (!vc->vc_par[0])
1896                                 vc->vc_par[0]++;
1897                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1898                         return;
1899                 case 'D':
1900                         if (!vc->vc_par[0])
1901                                 vc->vc_par[0]++;
1902                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1903                         return;
1904                 case 'E':
1905                         if (!vc->vc_par[0])
1906                                 vc->vc_par[0]++;
1907                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1908                         return;
1909                 case 'F':
1910                         if (!vc->vc_par[0])
1911                                 vc->vc_par[0]++;
1912                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1913                         return;
1914                 case 'd':
1915                         if (vc->vc_par[0])
1916                                 vc->vc_par[0]--;
1917                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1918                         return;
1919                 case 'H': case 'f':
1920                         if (vc->vc_par[0])
1921                                 vc->vc_par[0]--;
1922                         if (vc->vc_par[1])
1923                                 vc->vc_par[1]--;
1924                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1925                         return;
1926                 case 'J':
1927                         csi_J(vc, vc->vc_par[0]);
1928                         return;
1929                 case 'K':
1930                         csi_K(vc, vc->vc_par[0]);
1931                         return;
1932                 case 'L':
1933                         csi_L(vc, vc->vc_par[0]);
1934                         return;
1935                 case 'M':
1936                         csi_M(vc, vc->vc_par[0]);
1937                         return;
1938                 case 'P':
1939                         csi_P(vc, vc->vc_par[0]);
1940                         return;
1941                 case 'c':
1942                         if (!vc->vc_par[0])
1943                                 respond_ID(tty);
1944                         return;
1945                 case 'g':
1946                         if (!vc->vc_par[0])
1947                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1948                         else if (vc->vc_par[0] == 3) {
1949                                 vc->vc_tab_stop[0] =
1950                                         vc->vc_tab_stop[1] =
1951                                         vc->vc_tab_stop[2] =
1952                                         vc->vc_tab_stop[3] =
1953                                         vc->vc_tab_stop[4] =
1954                                         vc->vc_tab_stop[5] =
1955                                         vc->vc_tab_stop[6] =
1956                                         vc->vc_tab_stop[7] = 0;
1957                         }
1958                         return;
1959                 case 'm':
1960                         csi_m(vc);
1961                         return;
1962                 case 'q': /* DECLL - but only 3 leds */
1963                         /* map 0,1,2,3 to 0,1,2,4 */
1964                         if (vc->vc_par[0] < 4)
1965                                 setledstate(kbd_table + vc->vc_num,
1966                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1967                         return;
1968                 case 'r':
1969                         if (!vc->vc_par[0])
1970                                 vc->vc_par[0]++;
1971                         if (!vc->vc_par[1])
1972                                 vc->vc_par[1] = vc->vc_rows;
1973                         /* Minimum allowed region is 2 lines */
1974                         if (vc->vc_par[0] < vc->vc_par[1] &&
1975                             vc->vc_par[1] <= vc->vc_rows) {
1976                                 vc->vc_top = vc->vc_par[0] - 1;
1977                                 vc->vc_bottom = vc->vc_par[1];
1978                                 gotoxay(vc, 0, 0);
1979                         }
1980                         return;
1981                 case 's':
1982                         save_cur(vc);
1983                         return;
1984                 case 'u':
1985                         restore_cur(vc);
1986                         return;
1987                 case 'X':
1988                         csi_X(vc, vc->vc_par[0]);
1989                         return;
1990                 case '@':
1991                         csi_at(vc, vc->vc_par[0]);
1992                         return;
1993                 case ']': /* setterm functions */
1994                         setterm_command(vc);
1995                         return;
1996                 }
1997                 return;
1998         case ESpercent:
1999                 vc->vc_state = ESnormal;
2000                 switch (c) {
2001                 case '@':  /* defined in ISO 2022 */
2002                         vc->vc_utf = 0;
2003                         return;
2004                 case 'G':  /* prelim official escape code */
2005                 case '8':  /* retained for compatibility */
2006                         vc->vc_utf = 1;
2007                         return;
2008                 }
2009                 return;
2010         case ESfunckey:
2011                 vc->vc_state = ESnormal;
2012                 return;
2013         case EShash:
2014                 vc->vc_state = ESnormal;
2015                 if (c == '8') {
2016                         /* DEC screen alignment test. kludge :-) */
2017                         vc->vc_video_erase_char =
2018                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2019                         csi_J(vc, 2);
2020                         vc->vc_video_erase_char =
2021                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2022                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2023                 }
2024                 return;
2025         case ESsetG0:
2026                 if (c == '0')
2027                         vc->vc_G0_charset = GRAF_MAP;
2028                 else if (c == 'B')
2029                         vc->vc_G0_charset = LAT1_MAP;
2030                 else if (c == 'U')
2031                         vc->vc_G0_charset = IBMPC_MAP;
2032                 else if (c == 'K')
2033                         vc->vc_G0_charset = USER_MAP;
2034                 if (vc->vc_charset == 0)
2035                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2036                 vc->vc_state = ESnormal;
2037                 return;
2038         case ESsetG1:
2039                 if (c == '0')
2040                         vc->vc_G1_charset = GRAF_MAP;
2041                 else if (c == 'B')
2042                         vc->vc_G1_charset = LAT1_MAP;
2043                 else if (c == 'U')
2044                         vc->vc_G1_charset = IBMPC_MAP;
2045                 else if (c == 'K')
2046                         vc->vc_G1_charset = USER_MAP;
2047                 if (vc->vc_charset == 1)
2048                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2049                 vc->vc_state = ESnormal;
2050                 return;
2051         default:
2052                 vc->vc_state = ESnormal;
2053         }
2054 }
2055
2056 /* This is a temporary buffer used to prepare a tty console write
2057  * so that we can easily avoid touching user space while holding the
2058  * console spinlock.  It is allocated in con_init and is shared by
2059  * this code and the vc_screen read/write tty calls.
2060  *
2061  * We have to allocate this statically in the kernel data section
2062  * since console_init (and thus con_init) are called before any
2063  * kernel memory allocation is available.
2064  */
2065 char con_buf[CON_BUF_SIZE];
2066 DEFINE_MUTEX(con_buf_mtx);
2067
2068 /* is_double_width() is based on the wcwidth() implementation by
2069  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2070  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2071  */
2072 struct interval {
2073         uint32_t first;
2074         uint32_t last;
2075 };
2076
2077 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2078 {
2079         int min = 0;
2080         int mid;
2081
2082         if (ucs < table[0].first || ucs > table[max].last)
2083                 return 0;
2084         while (max >= min) {
2085                 mid = (min + max) / 2;
2086                 if (ucs > table[mid].last)
2087                         min = mid + 1;
2088                 else if (ucs < table[mid].first)
2089                         max = mid - 1;
2090                 else
2091                         return 1;
2092         }
2093         return 0;
2094 }
2095
2096 static int is_double_width(uint32_t ucs)
2097 {
2098         static const struct interval double_width[] = {
2099                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2100                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2101                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2102                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2103         };
2104         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2105 }
2106
2107 /* acquires console_sem */
2108 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2109 {
2110 #ifdef VT_BUF_VRAM_ONLY
2111 #define FLUSH do { } while(0);
2112 #else
2113 #define FLUSH if (draw_x >= 0) { \
2114         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2115         draw_x = -1; \
2116         }
2117 #endif
2118
2119         int c, tc, ok, n = 0, draw_x = -1;
2120         unsigned int currcons;
2121         unsigned long draw_from = 0, draw_to = 0;
2122         struct vc_data *vc;
2123         unsigned char vc_attr;
2124         struct vt_notifier_param param;
2125         uint8_t rescan;
2126         uint8_t inverse;
2127         uint8_t width;
2128         u16 himask, charmask;
2129
2130         if (in_interrupt())
2131                 return count;
2132
2133         might_sleep();
2134
2135         acquire_console_sem();
2136         vc = tty->driver_data;
2137         if (vc == NULL) {
2138                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2139                 release_console_sem();
2140                 return 0;
2141         }
2142
2143         currcons = vc->vc_num;
2144         if (!vc_cons_allocated(currcons)) {
2145             /* could this happen? */
2146                 printk_once("con_write: tty %d not allocated\n", currcons+1);
2147             release_console_sem();
2148             return 0;
2149         }
2150
2151         himask = vc->vc_hi_font_mask;
2152         charmask = himask ? 0x1ff : 0xff;
2153
2154         /* undraw cursor first */
2155         if (IS_FG(vc))
2156                 hide_cursor(vc);
2157
2158         param.vc = vc;
2159
2160         while (!tty->stopped && count) {
2161                 int orig = *buf;
2162                 c = orig;
2163                 buf++;
2164                 n++;
2165                 count--;
2166                 rescan = 0;
2167                 inverse = 0;
2168                 width = 1;
2169
2170                 /* Do no translation at all in control states */
2171                 if (vc->vc_state != ESnormal) {
2172                         tc = c;
2173                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2174                     /* Combine UTF-8 into Unicode in vc_utf_char.
2175                      * vc_utf_count is the number of continuation bytes still
2176                      * expected to arrive.
2177                      * vc_npar is the number of continuation bytes arrived so
2178                      * far
2179                      */
2180 rescan_last_byte:
2181                     if ((c & 0xc0) == 0x80) {
2182                         /* Continuation byte received */
2183                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2184                         if (vc->vc_utf_count) {
2185                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2186                             vc->vc_npar++;
2187                             if (--vc->vc_utf_count) {
2188                                 /* Still need some bytes */
2189                                 continue;
2190                             }
2191                             /* Got a whole character */
2192                             c = vc->vc_utf_char;
2193                             /* Reject overlong sequences */
2194                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2195                                         c > utf8_length_changes[vc->vc_npar])
2196                                 c = 0xfffd;
2197                         } else {
2198                             /* Unexpected continuation byte */
2199                             vc->vc_utf_count = 0;
2200                             c = 0xfffd;
2201                         }
2202                     } else {
2203                         /* Single ASCII byte or first byte of a sequence received */
2204                         if (vc->vc_utf_count) {
2205                             /* Continuation byte expected */
2206                             rescan = 1;
2207                             vc->vc_utf_count = 0;
2208                             c = 0xfffd;
2209                         } else if (c > 0x7f) {
2210                             /* First byte of a multibyte sequence received */
2211                             vc->vc_npar = 0;
2212                             if ((c & 0xe0) == 0xc0) {
2213                                 vc->vc_utf_count = 1;
2214                                 vc->vc_utf_char = (c & 0x1f);
2215                             } else if ((c & 0xf0) == 0xe0) {
2216                                 vc->vc_utf_count = 2;
2217                                 vc->vc_utf_char = (c & 0x0f);
2218                             } else if ((c & 0xf8) == 0xf0) {
2219                                 vc->vc_utf_count = 3;
2220                                 vc->vc_utf_char = (c & 0x07);
2221                             } else if ((c & 0xfc) == 0xf8) {
2222                                 vc->vc_utf_count = 4;
2223                                 vc->vc_utf_char = (c & 0x03);
2224                             } else if ((c & 0xfe) == 0xfc) {
2225                                 vc->vc_utf_count = 5;
2226                                 vc->vc_utf_char = (c & 0x01);
2227                             } else {
2228                                 /* 254 and 255 are invalid */
2229                                 c = 0xfffd;
2230                             }
2231                             if (vc->vc_utf_count) {
2232                                 /* Still need some bytes */
2233                                 continue;
2234                             }
2235                         }
2236                         /* Nothing to do if an ASCII byte was received */
2237                     }
2238                     /* End of UTF-8 decoding. */
2239                     /* c is the received character, or U+FFFD for invalid sequences. */
2240                     /* Replace invalid Unicode code points with U+FFFD too */
2241                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2242                         c = 0xfffd;
2243                     tc = c;
2244                 } else {        /* no utf or alternate charset mode */
2245                     tc = vc_translate(vc, c);
2246                 }
2247
2248                 param.c = tc;
2249                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2250                                         &param) == NOTIFY_STOP)
2251                         continue;
2252
2253                 /* If the original code was a control character we
2254                  * only allow a glyph to be displayed if the code is
2255                  * not normally used (such as for cursor movement) or
2256                  * if the disp_ctrl mode has been explicitly enabled.
2257                  * Certain characters (as given by the CTRL_ALWAYS
2258                  * bitmap) are always displayed as control characters,
2259                  * as the console would be pretty useless without
2260                  * them; to display an arbitrary font position use the
2261                  * direct-to-font zone in UTF-8 mode.
2262                  */
2263                 ok = tc && (c >= 32 ||
2264                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2265                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2266                         && (c != 127 || vc->vc_disp_ctrl)
2267                         && (c != 128+27);
2268
2269                 if (vc->vc_state == ESnormal && ok) {
2270                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2271                                 if (is_double_width(c))
2272                                         width = 2;
2273                         }
2274                         /* Now try to find out how to display it */
2275                         tc = conv_uni_to_pc(vc, tc);
2276                         if (tc & ~charmask) {
2277                                 if (tc == -1 || tc == -2) {
2278                                     continue; /* nothing to display */
2279                                 }
2280                                 /* Glyph not found */
2281                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2282                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2283                                        This would make absolutely no sense with Unicode in mind,
2284                                        but do this for ASCII characters since a font may lack
2285                                        Unicode mapping info and we don't want to end up with
2286                                        having question marks only. */
2287                                     tc = c;
2288                                 } else {
2289                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2290                                     tc = conv_uni_to_pc(vc, 0xfffd);
2291                                     if (tc < 0) {
2292                                         inverse = 1;
2293                                         tc = conv_uni_to_pc(vc, '?');
2294                                         if (tc < 0) tc = '?';
2295                                     }
2296                                 }
2297                         }
2298
2299                         if (!inverse) {
2300                                 vc_attr = vc->vc_attr;
2301                         } else {
2302                                 /* invert vc_attr */
2303                                 if (!vc->vc_can_do_color) {
2304                                         vc_attr = (vc->vc_attr) ^ 0x08;
2305                                 } else if (vc->vc_hi_font_mask == 0x100) {
2306                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2307                                 } else {
2308                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2309                                 }
2310                                 FLUSH
2311                         }
2312
2313                         while (1) {
2314                                 if (vc->vc_need_wrap || vc->vc_decim)
2315                                         FLUSH
2316                                 if (vc->vc_need_wrap) {
2317                                         cr(vc);
2318                                         lf(vc);
2319                                 }
2320                                 if (vc->vc_decim)
2321                                         insert_char(vc, 1);
2322                                 scr_writew(himask ?
2323                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2324                                              (vc_attr << 8) + tc,
2325                                            (u16 *) vc->vc_pos);
2326                                 if (DO_UPDATE(vc) && draw_x < 0) {
2327                                         draw_x = vc->vc_x;
2328                                         draw_from = vc->vc_pos;
2329                                 }
2330                                 if (vc->vc_x == vc->vc_cols - 1) {
2331                                         vc->vc_need_wrap = vc->vc_decawm;
2332                                         draw_to = vc->vc_pos + 2;
2333                                 } else {
2334                                         vc->vc_x++;
2335                                         draw_to = (vc->vc_pos += 2);
2336                                 }
2337
2338                                 if (!--width) break;
2339
2340                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2341                                 if (tc < 0) tc = ' ';
2342                         }
2343                         notify_write(vc, c);
2344
2345                         if (inverse) {
2346                                 FLUSH
2347                         }
2348
2349                         if (rescan) {
2350                                 rescan = 0;
2351                                 inverse = 0;
2352                                 width = 1;
2353                                 c = orig;
2354                                 goto rescan_last_byte;
2355                         }
2356                         continue;
2357                 }
2358                 FLUSH
2359                 do_con_trol(tty, vc, orig);
2360         }
2361         FLUSH
2362         console_conditional_schedule();
2363         release_console_sem();
2364         notify_update(vc);
2365         return n;
2366 #undef FLUSH
2367 }
2368
2369 /*
2370  * This is the console switching callback.
2371  *
2372  * Doing console switching in a process context allows
2373  * us to do the switches asynchronously (needed when we want
2374  * to switch due to a keyboard interrupt).  Synchronization
2375  * with other console code and prevention of re-entrancy is
2376  * ensured with console_sem.
2377  */
2378 static void console_callback(struct work_struct *ignored)
2379 {
2380         acquire_console_sem();
2381
2382         if (want_console >= 0) {
2383                 if (want_console != fg_console &&
2384                     vc_cons_allocated(want_console)) {
2385                         hide_cursor(vc_cons[fg_console].d);
2386                         change_console(vc_cons[want_console].d);
2387                         /* we only changed when the console had already
2388                            been allocated - a new console is not created
2389                            in an interrupt routine */
2390                 }
2391                 want_console = -1;
2392         }
2393         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2394                 do_poke_blanked_console = 0;
2395                 poke_blanked_console();
2396         }
2397         if (scrollback_delta) {
2398                 struct vc_data *vc = vc_cons[fg_console].d;
2399                 clear_selection();
2400                 if (vc->vc_mode == KD_TEXT)
2401                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2402                 scrollback_delta = 0;
2403         }
2404         if (blank_timer_expired) {
2405                 do_blank_screen(0);
2406                 blank_timer_expired = 0;
2407         }
2408         notify_update(vc_cons[fg_console].d);
2409
2410         release_console_sem();
2411 }
2412
2413 int set_console(int nr)
2414 {
2415         struct vc_data *vc = vc_cons[fg_console].d;
2416
2417         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2418                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2419
2420                 /*
2421                  * Console switch will fail in console_callback() or
2422                  * change_console() so there is no point scheduling
2423                  * the callback
2424                  *
2425                  * Existing set_console() users don't check the return
2426                  * value so this shouldn't break anything
2427                  */
2428                 return -EINVAL;
2429         }
2430
2431         want_console = nr;
2432         schedule_console_callback();
2433
2434         return 0;
2435 }
2436
2437 struct tty_driver *console_driver;
2438
2439 #ifdef CONFIG_VT_CONSOLE
2440
2441 /**
2442  * vt_kmsg_redirect() - Sets/gets the kernel message console
2443  * @new:        The new virtual terminal number or -1 if the console should stay
2444  *              unchanged
2445  *
2446  * By default, the kernel messages are always printed on the current virtual
2447  * console. However, the user may modify that default with the
2448  * TIOCL_SETKMSGREDIRECT ioctl call.
2449  *
2450  * This function sets the kernel message console to be @new. It returns the old
2451  * virtual console number. The virtual terminal number 0 (both as parameter and
2452  * return value) means no redirection (i.e. always printed on the currently
2453  * active console).
2454  *
2455  * The parameter -1 means that only the current console is returned, but the
2456  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2457  * case to make the code more understandable.
2458  *
2459  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2460  * the parameter and always returns 0.
2461  */
2462 int vt_kmsg_redirect(int new)
2463 {
2464         static int kmsg_con;
2465
2466         if (new != -1)
2467                 return xchg(&kmsg_con, new);
2468         else
2469                 return kmsg_con;
2470 }
2471
2472 /*
2473  *      Console on virtual terminal
2474  *
2475  * The console must be locked when we get here.
2476  */
2477
2478 static void vt_console_print(struct console *co, const char *b, unsigned count)
2479 {
2480         struct vc_data *vc = vc_cons[fg_console].d;
2481         unsigned char c;
2482         static DEFINE_SPINLOCK(printing_lock);
2483         const ushort *start;
2484         ushort cnt = 0;
2485         ushort myx;
2486         int kmsg_console;
2487
2488         /* console busy or not yet initialized */
2489         if (!printable)
2490                 return;
2491         if (!spin_trylock(&printing_lock))
2492                 return;
2493
2494         kmsg_console = vt_get_kmsg_redirect();
2495         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2496                 vc = vc_cons[kmsg_console - 1].d;
2497
2498         /* read `x' only after setting currcons properly (otherwise
2499            the `x' macro will read the x of the foreground console). */
2500         myx = vc->vc_x;
2501
2502         if (!vc_cons_allocated(fg_console)) {
2503                 /* impossible */
2504                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2505                 goto quit;
2506         }
2507
2508         if (vc->vc_mode != KD_TEXT)
2509                 goto quit;
2510
2511         /* undraw cursor first */
2512         if (IS_FG(vc))
2513                 hide_cursor(vc);
2514
2515         start = (ushort *)vc->vc_pos;
2516
2517         /* Contrived structure to try to emulate original need_wrap behaviour
2518          * Problems caused when we have need_wrap set on '\n' character */
2519         while (count--) {
2520                 c = *b++;
2521                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2522                         if (cnt > 0) {
2523                                 if (CON_IS_VISIBLE(vc))
2524                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2525                                 vc->vc_x += cnt;
2526                                 if (vc->vc_need_wrap)
2527                                         vc->vc_x--;
2528                                 cnt = 0;
2529                         }
2530                         if (c == 8) {           /* backspace */
2531                                 bs(vc);
2532                                 start = (ushort *)vc->vc_pos;
2533                                 myx = vc->vc_x;
2534                                 continue;
2535                         }
2536                         if (c != 13)
2537                                 lf(vc);
2538                         cr(vc);
2539                         start = (ushort *)vc->vc_pos;
2540                         myx = vc->vc_x;
2541                         if (c == 10 || c == 13)
2542                                 continue;
2543                 }
2544                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2545                 notify_write(vc, c);
2546                 cnt++;
2547                 if (myx == vc->vc_cols - 1) {
2548                         vc->vc_need_wrap = 1;
2549                         continue;
2550                 }
2551                 vc->vc_pos += 2;
2552                 myx++;
2553         }
2554         if (cnt > 0) {
2555                 if (CON_IS_VISIBLE(vc))
2556                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2557                 vc->vc_x += cnt;
2558                 if (vc->vc_x == vc->vc_cols) {
2559                         vc->vc_x--;
2560                         vc->vc_need_wrap = 1;
2561                 }
2562         }
2563         set_cursor(vc);
2564         notify_update(vc);
2565
2566 quit:
2567         spin_unlock(&printing_lock);
2568 }
2569
2570 static struct tty_driver *vt_console_device(struct console *c, int *index)
2571 {
2572         *index = c->index ? c->index-1 : fg_console;
2573         return console_driver;
2574 }
2575
2576 static struct console vt_console_driver = {
2577         .name           = "tty",
2578         .write          = vt_console_print,
2579         .device         = vt_console_device,
2580         .unblank        = unblank_screen,
2581         .flags          = CON_PRINTBUFFER,
2582         .index          = -1,
2583 };
2584 #endif
2585
2586 /*
2587  *      Handling of Linux-specific VC ioctls
2588  */
2589
2590 /*
2591  * Generally a bit racy with respect to console_sem().
2592  *
2593  * There are some functions which don't need it.
2594  *
2595  * There are some functions which can sleep for arbitrary periods
2596  * (paste_selection) but we don't need the lock there anyway.
2597  *
2598  * set_selection has locking, and definitely needs it
2599  */
2600
2601 int tioclinux(struct tty_struct *tty, unsigned long arg)
2602 {
2603         char type, data;
2604         char __user *p = (char __user *)arg;
2605         int lines;
2606         int ret;
2607
2608         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2609                 return -EPERM;
2610         if (get_user(type, p))
2611                 return -EFAULT;
2612         ret = 0;
2613
2614         lock_kernel();
2615
2616         switch (type)
2617         {
2618                 case TIOCL_SETSEL:
2619                         acquire_console_sem();
2620                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2621                         release_console_sem();
2622                         break;
2623                 case TIOCL_PASTESEL:
2624                         ret = paste_selection(tty);
2625                         break;
2626                 case TIOCL_UNBLANKSCREEN:
2627                         acquire_console_sem();
2628                         unblank_screen();
2629                         release_console_sem();
2630                         break;
2631                 case TIOCL_SELLOADLUT:
2632                         ret = sel_loadlut(p);
2633                         break;
2634                 case TIOCL_GETSHIFTSTATE:
2635
2636         /*
2637          * Make it possible to react to Shift+Mousebutton.
2638          * Note that 'shift_state' is an undocumented
2639          * kernel-internal variable; programs not closely
2640          * related to the kernel should not use this.
2641          */
2642                         data = shift_state;
2643                         ret = __put_user(data, p);
2644                         break;
2645                 case TIOCL_GETMOUSEREPORTING:
2646                         data = mouse_reporting();
2647                         ret = __put_user(data, p);
2648                         break;
2649                 case TIOCL_SETVESABLANK:
2650                         ret = set_vesa_blanking(p);
2651                         break;
2652                 case TIOCL_GETKMSGREDIRECT:
2653                         data = vt_get_kmsg_redirect();
2654                         ret = __put_user(data, p);
2655                         break;
2656                 case TIOCL_SETKMSGREDIRECT:
2657                         if (!capable(CAP_SYS_ADMIN)) {
2658                                 ret = -EPERM;
2659                         } else {
2660                                 if (get_user(data, p+1))
2661                                         ret = -EFAULT;
2662                                 else
2663                                         vt_kmsg_redirect(data);
2664                         }
2665                         break;
2666                 case TIOCL_GETFGCONSOLE:
2667                         ret = fg_console;
2668                         break;
2669                 case TIOCL_SCROLLCONSOLE:
2670                         if (get_user(lines, (s32 __user *)(p+4))) {
2671                                 ret = -EFAULT;
2672                         } else {
2673                                 scrollfront(vc_cons[fg_console].d, lines);
2674                                 ret = 0;
2675                         }
2676                         break;
2677                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2678                         acquire_console_sem();
2679                         ignore_poke = 1;
2680                         do_blank_screen(0);
2681                         release_console_sem();
2682                         break;
2683                 case TIOCL_BLANKEDSCREEN:
2684                         ret = console_blanked;
2685                         break;
2686                 default:
2687                         ret = -EINVAL;
2688                         break;
2689         }
2690         unlock_kernel();
2691         return ret;
2692 }
2693
2694 /*
2695  * /dev/ttyN handling
2696  */
2697
2698 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2699 {
2700         int     retval;
2701
2702         retval = do_con_write(tty, buf, count);
2703         con_flush_chars(tty);
2704
2705         return retval;
2706 }
2707
2708 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2709 {
2710         if (in_interrupt())
2711                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2712         return do_con_write(tty, &ch, 1);
2713 }
2714
2715 static int con_write_room(struct tty_struct *tty)
2716 {
2717         if (tty->stopped)
2718                 return 0;
2719         return 32768;           /* No limit, really; we're not buffering */
2720 }
2721
2722 static int con_chars_in_buffer(struct tty_struct *tty)
2723 {
2724         return 0;               /* we're not buffering */
2725 }
2726
2727 /*
2728  * con_throttle and con_unthrottle are only used for
2729  * paste_selection(), which has to stuff in a large number of
2730  * characters...
2731  */
2732 static void con_throttle(struct tty_struct *tty)
2733 {
2734 }
2735
2736 static void con_unthrottle(struct tty_struct *tty)
2737 {
2738         struct vc_data *vc = tty->driver_data;
2739
2740         wake_up_interruptible(&vc->paste_wait);
2741 }
2742
2743 /*
2744  * Turn the Scroll-Lock LED on when the tty is stopped
2745  */
2746 static void con_stop(struct tty_struct *tty)
2747 {
2748         int console_num;
2749         if (!tty)
2750                 return;
2751         console_num = tty->index;
2752         if (!vc_cons_allocated(console_num))
2753                 return;
2754         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2755         set_leds();
2756 }
2757
2758 /*
2759  * Turn the Scroll-Lock LED off when the console is started
2760  */
2761 static void con_start(struct tty_struct *tty)
2762 {
2763         int console_num;
2764         if (!tty)
2765                 return;
2766         console_num = tty->index;
2767         if (!vc_cons_allocated(console_num))
2768                 return;
2769         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2770         set_leds();
2771 }
2772
2773 static void con_flush_chars(struct tty_struct *tty)
2774 {
2775         struct vc_data *vc;
2776
2777         if (in_interrupt())     /* from flush_to_ldisc */
2778                 return;
2779
2780         /* if we race with con_close(), vt may be null */
2781         acquire_console_sem();
2782         vc = tty->driver_data;
2783         if (vc)
2784                 set_cursor(vc);
2785         release_console_sem();
2786 }
2787
2788 /*
2789  * Allocate the console screen memory.
2790  */
2791 static int con_open(struct tty_struct *tty, struct file *filp)
2792 {
2793         unsigned int currcons = tty->index;
2794         int ret = 0;
2795
2796         acquire_console_sem();
2797         if (tty->driver_data == NULL) {
2798                 ret = vc_allocate(currcons);
2799                 if (ret == 0) {
2800                         struct vc_data *vc = vc_cons[currcons].d;
2801
2802                         /* Still being freed */
2803                         if (vc->vc_tty) {
2804                                 release_console_sem();
2805                                 return -ERESTARTSYS;
2806                         }
2807                         tty->driver_data = vc;
2808                         vc->vc_tty = tty;
2809
2810                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2811                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2812                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2813                         }
2814                         if (vc->vc_utf)
2815                                 tty->termios->c_iflag |= IUTF8;
2816                         else
2817                                 tty->termios->c_iflag &= ~IUTF8;
2818                         release_console_sem();
2819                         return ret;
2820                 }
2821         }
2822         release_console_sem();
2823         return ret;
2824 }
2825
2826 static void con_close(struct tty_struct *tty, struct file *filp)
2827 {
2828         /* Nothing to do - we defer to shutdown */
2829 }
2830
2831 static void con_shutdown(struct tty_struct *tty)
2832 {
2833         struct vc_data *vc = tty->driver_data;
2834         BUG_ON(vc == NULL);
2835         acquire_console_sem();
2836         vc->vc_tty = NULL;
2837         release_console_sem();
2838         tty_shutdown(tty);
2839 }
2840
2841 static int default_italic_color    = 2; // green (ASCII)
2842 static int default_underline_color = 3; // cyan (ASCII)
2843 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2844 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2845
2846 static void vc_init(struct vc_data *vc, unsigned int rows,
2847                     unsigned int cols, int do_clear)
2848 {
2849         int j, k ;
2850
2851         vc->vc_cols = cols;
2852         vc->vc_rows = rows;
2853         vc->vc_size_row = cols << 1;
2854         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2855
2856         set_origin(vc);
2857         vc->vc_pos = vc->vc_origin;
2858         reset_vc(vc);
2859         for (j=k=0; j<16; j++) {
2860                 vc->vc_palette[k++] = default_red[j] ;
2861                 vc->vc_palette[k++] = default_grn[j] ;
2862                 vc->vc_palette[k++] = default_blu[j] ;
2863         }
2864         vc->vc_def_color       = 0x07;   /* white */
2865         vc->vc_ulcolor         = default_underline_color;
2866         vc->vc_itcolor         = default_italic_color;
2867         vc->vc_halfcolor       = 0x08;   /* grey */
2868         init_waitqueue_head(&vc->paste_wait);
2869         reset_terminal(vc, do_clear);
2870 }
2871
2872 /*
2873  * This routine initializes console interrupts, and does nothing
2874  * else. If you want the screen to clear, call tty_write with
2875  * the appropriate escape-sequence.
2876  */
2877
2878 static int __init con_init(void)
2879 {
2880         const char *display_desc = NULL;
2881         struct vc_data *vc;
2882         unsigned int currcons = 0, i;
2883
2884         acquire_console_sem();
2885
2886         if (conswitchp)
2887                 display_desc = conswitchp->con_startup();
2888         if (!display_desc) {
2889                 fg_console = 0;
2890                 release_console_sem();
2891                 return 0;
2892         }
2893
2894         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2895                 struct con_driver *con_driver = &registered_con_driver[i];
2896
2897                 if (con_driver->con == NULL) {
2898                         con_driver->con = conswitchp;
2899                         con_driver->desc = display_desc;
2900                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2901                         con_driver->first = 0;
2902                         con_driver->last = MAX_NR_CONSOLES - 1;
2903                         break;
2904                 }
2905         }
2906
2907         for (i = 0; i < MAX_NR_CONSOLES; i++)
2908                 con_driver_map[i] = conswitchp;
2909
2910         if (blankinterval) {
2911                 blank_state = blank_normal_wait;
2912                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2913         }
2914
2915         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2916                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2917                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2918                 visual_init(vc, currcons, 1);
2919                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2920                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2921                         currcons || !vc->vc_sw->con_save_screen);
2922         }
2923         currcons = fg_console = 0;
2924         master_display_fg = vc = vc_cons[currcons].d;
2925         set_origin(vc);
2926         save_screen(vc);
2927         gotoxy(vc, vc->vc_x, vc->vc_y);
2928         csi_J(vc, 0);
2929         update_screen(vc);
2930         printk("Console: %s %s %dx%d",
2931                 vc->vc_can_do_color ? "colour" : "mono",
2932                 display_desc, vc->vc_cols, vc->vc_rows);
2933         printable = 1;
2934         printk("\n");
2935
2936         release_console_sem();
2937
2938 #ifdef CONFIG_VT_CONSOLE
2939         register_console(&vt_console_driver);
2940 #endif
2941         return 0;
2942 }
2943 console_initcall(con_init);
2944
2945 static const struct tty_operations con_ops = {
2946         .open = con_open,
2947         .close = con_close,
2948         .write = con_write,
2949         .write_room = con_write_room,
2950         .put_char = con_put_char,
2951         .flush_chars = con_flush_chars,
2952         .chars_in_buffer = con_chars_in_buffer,
2953         .ioctl = vt_ioctl,
2954 #ifdef CONFIG_COMPAT
2955         .compat_ioctl = vt_compat_ioctl,
2956 #endif
2957         .stop = con_stop,
2958         .start = con_start,
2959         .throttle = con_throttle,
2960         .unthrottle = con_unthrottle,
2961         .resize = vt_resize,
2962         .shutdown = con_shutdown
2963 };
2964
2965 static struct cdev vc0_cdev;
2966
2967 int __init vty_init(const struct file_operations *console_fops)
2968 {
2969         cdev_init(&vc0_cdev, console_fops);
2970         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2971             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2972                 panic("Couldn't register /dev/tty0 driver\n");
2973         device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2974
2975         vcs_init();
2976
2977         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2978         if (!console_driver)
2979                 panic("Couldn't allocate console driver\n");
2980         console_driver->owner = THIS_MODULE;
2981         console_driver->name = "tty";
2982         console_driver->name_base = 1;
2983         console_driver->major = TTY_MAJOR;
2984         console_driver->minor_start = 1;
2985         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2986         console_driver->init_termios = tty_std_termios;
2987         if (default_utf8)
2988                 console_driver->init_termios.c_iflag |= IUTF8;
2989         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2990         tty_set_operations(console_driver, &con_ops);
2991         if (tty_register_driver(console_driver))
2992                 panic("Couldn't register console driver\n");
2993         kbd_init();
2994         console_map_init();
2995 #ifdef CONFIG_MDA_CONSOLE
2996         mda_console_init();
2997 #endif
2998         return 0;
2999 }
3000
3001 #ifndef VT_SINGLE_DRIVER
3002
3003 static struct class *vtconsole_class;
3004
3005 static int bind_con_driver(const struct consw *csw, int first, int last,
3006                            int deflt)
3007 {
3008         struct module *owner = csw->owner;
3009         const char *desc = NULL;
3010         struct con_driver *con_driver;
3011         int i, j = -1, k = -1, retval = -ENODEV;
3012
3013         if (!try_module_get(owner))
3014                 return -ENODEV;
3015
3016         acquire_console_sem();
3017
3018         /* check if driver is registered */
3019         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3020                 con_driver = &registered_con_driver[i];
3021
3022                 if (con_driver->con == csw) {
3023                         desc = con_driver->desc;
3024                         retval = 0;
3025                         break;
3026                 }
3027         }
3028
3029         if (retval)
3030                 goto err;
3031
3032         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3033                 csw->con_startup();
3034                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3035         }
3036
3037         if (deflt) {
3038                 if (conswitchp)
3039                         module_put(conswitchp->owner);
3040
3041                 __module_get(owner);
3042                 conswitchp = csw;
3043         }
3044
3045         first = max(first, con_driver->first);
3046         last = min(last, con_driver->last);
3047
3048         for (i = first; i <= last; i++) {
3049                 int old_was_color;
3050                 struct vc_data *vc = vc_cons[i].d;
3051
3052                 if (con_driver_map[i])
3053                         module_put(con_driver_map[i]->owner);
3054                 __module_get(owner);
3055                 con_driver_map[i] = csw;
3056
3057                 if (!vc || !vc->vc_sw)
3058                         continue;
3059
3060                 j = i;
3061
3062                 if (CON_IS_VISIBLE(vc)) {
3063                         k = i;
3064                         save_screen(vc);
3065                 }
3066
3067                 old_was_color = vc->vc_can_do_color;
3068                 vc->vc_sw->con_deinit(vc);
3069                 if (!vc->vc_origin)
3070                         vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3071                 visual_init(vc, i, 0);
3072                 set_origin(vc);
3073                 update_attr(vc);
3074
3075                 /* If the console changed between mono <-> color, then
3076                  * the attributes in the screenbuf will be wrong.  The
3077                  * following resets all attributes to something sane.
3078                  */
3079                 if (old_was_color != vc->vc_can_do_color)
3080                         clear_buffer_attributes(vc);
3081         }
3082
3083         printk("Console: switching ");
3084         if (!deflt)
3085                 printk("consoles %d-%d ", first+1, last+1);
3086         if (j >= 0) {
3087                 struct vc_data *vc = vc_cons[j].d;
3088
3089                 printk("to %s %s %dx%d\n",
3090                        vc->vc_can_do_color ? "colour" : "mono",
3091                        desc, vc->vc_cols, vc->vc_rows);
3092
3093                 if (k >= 0) {
3094                         vc = vc_cons[k].d;
3095                         update_screen(vc);
3096                 }
3097         } else
3098                 printk("to %s\n", desc);
3099
3100         retval = 0;
3101 err:
3102         release_console_sem();
3103         module_put(owner);
3104         return retval;
3105 };
3106
3107 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3108 static int con_is_graphics(const struct consw *csw, int first, int last)
3109 {
3110         int i, retval = 0;
3111
3112         for (i = first; i <= last; i++) {
3113                 struct vc_data *vc = vc_cons[i].d;
3114
3115                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3116                         retval = 1;
3117                         break;
3118                 }
3119         }
3120
3121         return retval;
3122 }
3123
3124 /**
3125  * unbind_con_driver - unbind a console driver
3126  * @csw: pointer to console driver to unregister
3127  * @first: first in range of consoles that @csw should be unbound from
3128  * @last: last in range of consoles that @csw should be unbound from
3129  * @deflt: should next bound console driver be default after @csw is unbound?
3130  *
3131  * To unbind a driver from all possible consoles, pass 0 as @first and
3132  * %MAX_NR_CONSOLES as @last.
3133  *
3134  * @deflt controls whether the console that ends up replacing @csw should be
3135  * the default console.
3136  *
3137  * RETURNS:
3138  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3139  * or 0 on success.
3140  */
3141 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3142 {
3143         struct module *owner = csw->owner;
3144         const struct consw *defcsw = NULL;
3145         struct con_driver *con_driver = NULL, *con_back = NULL;
3146         int i, retval = -ENODEV;
3147
3148         if (!try_module_get(owner))
3149                 return -ENODEV;
3150
3151         acquire_console_sem();
3152
3153         /* check if driver is registered and if it is unbindable */
3154         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3155                 con_driver = &registered_con_driver[i];
3156
3157                 if (con_driver->con == csw &&
3158                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3159                         retval = 0;
3160                         break;
3161                 }
3162         }
3163
3164         if (retval) {
3165                 release_console_sem();
3166                 goto err;
3167         }
3168
3169         retval = -ENODEV;
3170
3171         /* check if backup driver exists */
3172         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3173                 con_back = &registered_con_driver[i];
3174
3175                 if (con_back->con &&
3176                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3177                         defcsw = con_back->con;
3178                         retval = 0;
3179                         break;
3180                 }
3181         }
3182
3183         if (retval) {
3184                 release_console_sem();
3185                 goto err;
3186         }
3187
3188         if (!con_is_bound(csw)) {
3189                 release_console_sem();
3190                 goto err;
3191         }
3192
3193         first = max(first, con_driver->first);
3194         last = min(last, con_driver->last);
3195
3196         for (i = first; i <= last; i++) {
3197                 if (con_driver_map[i] == csw) {
3198                         module_put(csw->owner);
3199                         con_driver_map[i] = NULL;
3200                 }
3201         }
3202
3203         if (!con_is_bound(defcsw)) {
3204                 const struct consw *defconsw = conswitchp;
3205
3206                 defcsw->con_startup();
3207                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3208                 /*
3209                  * vgacon may change the default driver to point
3210                  * to dummycon, we restore it here...
3211                  */
3212                 conswitchp = defconsw;
3213         }
3214
3215         if (!con_is_bound(csw))
3216                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3217
3218         release_console_sem();
3219         /* ignore return value, binding should not fail */
3220         bind_con_driver(defcsw, first, last, deflt);
3221 err:
3222         module_put(owner);
3223         return retval;
3224
3225 }
3226 EXPORT_SYMBOL(unbind_con_driver);
3227
3228 static int vt_bind(struct con_driver *con)
3229 {
3230         const struct consw *defcsw = NULL, *csw = NULL;
3231         int i, more = 1, first = -1, last = -1, deflt = 0;
3232
3233         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3234             con_is_graphics(con->con, con->first, con->last))
3235                 goto err;
3236
3237         csw = con->con;
3238
3239         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3240                 struct con_driver *con = &registered_con_driver[i];
3241
3242                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3243                         defcsw = con->con;
3244                         break;
3245                 }
3246         }
3247
3248         if (!defcsw)
3249                 goto err;
3250
3251         while (more) {
3252                 more = 0;
3253
3254                 for (i = con->first; i <= con->last; i++) {
3255                         if (con_driver_map[i] == defcsw) {
3256                                 if (first == -1)
3257                                         first = i;
3258                                 last = i;
3259                                 more = 1;
3260                         } else if (first != -1)
3261                                 break;
3262                 }
3263
3264                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3265                         deflt = 1;
3266
3267                 if (first != -1)
3268                         bind_con_driver(csw, first, last, deflt);
3269
3270                 first = -1;
3271                 last = -1;
3272                 deflt = 0;
3273         }
3274
3275 err:
3276         return 0;
3277 }
3278
3279 static int vt_unbind(struct con_driver *con)
3280 {
3281         const struct consw *csw = NULL;
3282         int i, more = 1, first = -1, last = -1, deflt = 0;
3283
3284         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3285             con_is_graphics(con->con, con->first, con->last))
3286                 goto err;
3287
3288         csw = con->con;
3289
3290         while (more) {
3291                 more = 0;
3292
3293                 for (i = con->first; i <= con->last; i++) {
3294                         if (con_driver_map[i] == csw) {
3295                                 if (first == -1)
3296                                         first = i;
3297                                 last = i;
3298                                 more = 1;
3299                         } else if (first != -1)
3300                                 break;
3301                 }
3302
3303                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3304                         deflt = 1;
3305
3306                 if (first != -1)
3307                         unbind_con_driver(csw, first, last, deflt);
3308
3309                 first = -1;
3310                 last = -1;
3311                 deflt = 0;
3312         }
3313
3314 err:
3315         return 0;
3316 }
3317 #else
3318 static inline int vt_bind(struct con_driver *con)
3319 {
3320         return 0;
3321 }
3322 static inline int vt_unbind(struct con_driver *con)
3323 {
3324         return 0;
3325 }
3326 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3327
3328 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3329                           const char *buf, size_t count)
3330 {
3331         struct con_driver *con = dev_get_drvdata(dev);
3332         int bind = simple_strtoul(buf, NULL, 0);
3333
3334         if (bind)
3335                 vt_bind(con);
3336         else
3337                 vt_unbind(con);
3338
3339         return count;
3340 }
3341
3342 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3343                          char *buf)
3344 {
3345         struct con_driver *con = dev_get_drvdata(dev);
3346         int bind = con_is_bound(con->con);
3347
3348         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3349 }
3350
3351 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3352                          char *buf)
3353 {
3354         struct con_driver *con = dev_get_drvdata(dev);
3355
3356         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3357                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3358                          con->desc);
3359
3360 }
3361
3362 static struct device_attribute device_attrs[] = {
3363         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3364         __ATTR(name, S_IRUGO, show_name, NULL),
3365 };
3366
3367 static int vtconsole_init_device(struct con_driver *con)
3368 {
3369         int i;
3370         int error = 0;
3371
3372         con->flag |= CON_DRIVER_FLAG_ATTR;
3373         dev_set_drvdata(con->dev, con);
3374         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3375                 error = device_create_file(con->dev, &device_attrs[i]);
3376                 if (error)
3377                         break;
3378         }
3379
3380         if (error) {
3381                 while (--i >= 0)
3382                         device_remove_file(con->dev, &device_attrs[i]);
3383                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3384         }
3385
3386         return error;
3387 }
3388
3389 static void vtconsole_deinit_device(struct con_driver *con)
3390 {
3391         int i;
3392
3393         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3394                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3395                         device_remove_file(con->dev, &device_attrs[i]);
3396                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3397         }
3398 }
3399
3400 /**
3401  * con_is_bound - checks if driver is bound to the console
3402  * @csw: console driver
3403  *
3404  * RETURNS: zero if unbound, nonzero if bound
3405  *
3406  * Drivers can call this and if zero, they should release
3407  * all resources allocated on con_startup()
3408  */
3409 int con_is_bound(const struct consw *csw)
3410 {
3411         int i, bound = 0;
3412
3413         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3414                 if (con_driver_map[i] == csw) {
3415                         bound = 1;
3416                         break;
3417                 }
3418         }
3419
3420         return bound;
3421 }
3422 EXPORT_SYMBOL(con_is_bound);
3423
3424 /**
3425  * con_debug_enter - prepare the console for the kernel debugger
3426  * @sw: console driver
3427  *
3428  * Called when the console is taken over by the kernel debugger, this
3429  * function needs to save the current console state, then put the console
3430  * into a state suitable for the kernel debugger.
3431  *
3432  * RETURNS:
3433  * Zero on success, nonzero if a failure occurred when trying to prepare
3434  * the console for the debugger.
3435  */
3436 int con_debug_enter(struct vc_data *vc)
3437 {
3438         int ret = 0;
3439
3440         saved_fg_console = fg_console;
3441         saved_last_console = last_console;
3442         saved_want_console = want_console;
3443         saved_vc_mode = vc->vc_mode;
3444         vc->vc_mode = KD_TEXT;
3445         console_blanked = 0;
3446         if (vc->vc_sw->con_debug_enter)
3447                 ret = vc->vc_sw->con_debug_enter(vc);
3448 #ifdef CONFIG_KGDB_KDB
3449         /* Set the initial LINES variable if it is not already set */
3450         if (vc->vc_rows < 999) {
3451                 int linecount;
3452                 char lns[4];
3453                 const char *setargs[3] = {
3454                         "set",
3455                         "LINES",
3456                         lns,
3457                 };
3458                 if (kdbgetintenv(setargs[0], &linecount)) {
3459                         snprintf(lns, 4, "%i", vc->vc_rows);
3460                         kdb_set(2, setargs);
3461                 }
3462         }
3463 #endif /* CONFIG_KGDB_KDB */
3464         return ret;
3465 }
3466 EXPORT_SYMBOL_GPL(con_debug_enter);
3467
3468 /**
3469  * con_debug_leave - restore console state
3470  * @sw: console driver
3471  *
3472  * Restore the console state to what it was before the kernel debugger
3473  * was invoked.
3474  *
3475  * RETURNS:
3476  * Zero on success, nonzero if a failure occurred when trying to restore
3477  * the console.
3478  */
3479 int con_debug_leave(void)
3480 {
3481         struct vc_data *vc;
3482         int ret = 0;
3483
3484         fg_console = saved_fg_console;
3485         last_console = saved_last_console;
3486         want_console = saved_want_console;
3487         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3488
3489         vc = vc_cons[fg_console].d;
3490         if (vc->vc_sw->con_debug_leave)
3491                 ret = vc->vc_sw->con_debug_leave(vc);
3492         return ret;
3493 }
3494 EXPORT_SYMBOL_GPL(con_debug_leave);
3495
3496 /**
3497  * register_con_driver - register console driver to console layer
3498  * @csw: console driver
3499  * @first: the first console to take over, minimum value is 0
3500  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3501  *
3502  * DESCRIPTION: This function registers a console driver which can later
3503  * bind to a range of consoles specified by @first and @last. It will
3504  * also initialize the console driver by calling con_startup().
3505  */
3506 int register_con_driver(const struct consw *csw, int first, int last)
3507 {
3508         struct module *owner = csw->owner;
3509         struct con_driver *con_driver;
3510         const char *desc;
3511         int i, retval = 0;
3512
3513         if (!try_module_get(owner))
3514                 return -ENODEV;
3515
3516         acquire_console_sem();
3517
3518         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3519                 con_driver = &registered_con_driver[i];
3520
3521                 /* already registered */
3522                 if (con_driver->con == csw)
3523                         retval = -EINVAL;
3524         }
3525
3526         if (retval)
3527                 goto err;
3528
3529         desc = csw->con_startup();
3530
3531         if (!desc)
3532                 goto err;
3533
3534         retval = -EINVAL;
3535
3536         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3537                 con_driver = &registered_con_driver[i];
3538
3539                 if (con_driver->con == NULL) {
3540                         con_driver->con = csw;
3541                         con_driver->desc = desc;
3542                         con_driver->node = i;
3543                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3544                                            CON_DRIVER_FLAG_INIT;
3545                         con_driver->first = first;
3546                         con_driver->last = last;
3547                         retval = 0;
3548                         break;
3549                 }
3550         }
3551
3552         if (retval)
3553                 goto err;
3554
3555         con_driver->dev = device_create(vtconsole_class, NULL,
3556                                                 MKDEV(0, con_driver->node),
3557                                                 NULL, "vtcon%i",
3558                                                 con_driver->node);
3559
3560         if (IS_ERR(con_driver->dev)) {
3561                 printk(KERN_WARNING "Unable to create device for %s; "
3562                        "errno = %ld\n", con_driver->desc,
3563                        PTR_ERR(con_driver->dev));
3564                 con_driver->dev = NULL;
3565         } else {
3566                 vtconsole_init_device(con_driver);
3567         }
3568
3569 err:
3570         release_console_sem();
3571         module_put(owner);
3572         return retval;
3573 }
3574 EXPORT_SYMBOL(register_con_driver);
3575
3576 /**
3577  * unregister_con_driver - unregister console driver from console layer
3578  * @csw: console driver
3579  *
3580  * DESCRIPTION: All drivers that registers to the console layer must
3581  * call this function upon exit, or if the console driver is in a state
3582  * where it won't be able to handle console services, such as the
3583  * framebuffer console without loaded framebuffer drivers.
3584  *
3585  * The driver must unbind first prior to unregistration.
3586  */
3587 int unregister_con_driver(const struct consw *csw)
3588 {
3589         int i, retval = -ENODEV;
3590
3591         acquire_console_sem();
3592
3593         /* cannot unregister a bound driver */
3594         if (con_is_bound(csw))
3595                 goto err;
3596
3597         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3598                 struct con_driver *con_driver = &registered_con_driver[i];
3599
3600                 if (con_driver->con == csw &&
3601                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3602                         vtconsole_deinit_device(con_driver);
3603                         device_destroy(vtconsole_class,
3604                                        MKDEV(0, con_driver->node));
3605                         con_driver->con = NULL;
3606                         con_driver->desc = NULL;
3607                         con_driver->dev = NULL;
3608                         con_driver->node = 0;
3609                         con_driver->flag = 0;
3610                         con_driver->first = 0;
3611                         con_driver->last = 0;
3612                         retval = 0;
3613                         break;
3614                 }
3615         }
3616 err:
3617         release_console_sem();
3618         return retval;
3619 }
3620 EXPORT_SYMBOL(unregister_con_driver);
3621
3622 /*
3623  *      If we support more console drivers, this function is used
3624  *      when a driver wants to take over some existing consoles
3625  *      and become default driver for newly opened ones.
3626  *
3627  *      take_over_console is basically a register followed by unbind
3628  */
3629 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3630 {
3631         int err;
3632
3633         err = register_con_driver(csw, first, last);
3634
3635         if (!err)
3636                 bind_con_driver(csw, first, last, deflt);
3637
3638         return err;
3639 }
3640
3641 /*
3642  * give_up_console is a wrapper to unregister_con_driver. It will only
3643  * work if driver is fully unbound.
3644  */
3645 void give_up_console(const struct consw *csw)
3646 {
3647         unregister_con_driver(csw);
3648 }
3649
3650 static int __init vtconsole_class_init(void)
3651 {
3652         int i;
3653
3654         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3655         if (IS_ERR(vtconsole_class)) {
3656                 printk(KERN_WARNING "Unable to create vt console class; "
3657                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3658                 vtconsole_class = NULL;
3659         }
3660
3661         /* Add system drivers to sysfs */
3662         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3663                 struct con_driver *con = &registered_con_driver[i];
3664
3665                 if (con->con && !con->dev) {
3666                         con->dev = device_create(vtconsole_class, NULL,
3667                                                          MKDEV(0, con->node),
3668                                                          NULL, "vtcon%i",
3669                                                          con->node);
3670
3671                         if (IS_ERR(con->dev)) {
3672                                 printk(KERN_WARNING "Unable to create "
3673                                        "device for %s; errno = %ld\n",
3674                                        con->desc, PTR_ERR(con->dev));
3675                                 con->dev = NULL;
3676                         } else {
3677                                 vtconsole_init_device(con);
3678                         }
3679                 }
3680         }
3681
3682         return 0;
3683 }
3684 postcore_initcall(vtconsole_class_init);
3685
3686 #endif
3687
3688 /*
3689  *      Screen blanking
3690  */
3691
3692 static int set_vesa_blanking(char __user *p)
3693 {
3694         unsigned int mode;
3695
3696         if (get_user(mode, p + 1))
3697                 return -EFAULT;
3698
3699         vesa_blank_mode = (mode < 4) ? mode : 0;
3700         return 0;
3701 }
3702
3703 void do_blank_screen(int entering_gfx)
3704 {
3705         struct vc_data *vc = vc_cons[fg_console].d;
3706         int i;
3707
3708         WARN_CONSOLE_UNLOCKED();
3709
3710         if (console_blanked) {
3711                 if (blank_state == blank_vesa_wait) {
3712                         blank_state = blank_off;
3713                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3714                 }
3715                 return;
3716         }
3717
3718         /* entering graphics mode? */
3719         if (entering_gfx) {
3720                 hide_cursor(vc);
3721                 save_screen(vc);
3722                 vc->vc_sw->con_blank(vc, -1, 1);
3723                 console_blanked = fg_console + 1;
3724                 blank_state = blank_off;
3725                 set_origin(vc);
3726                 return;
3727         }
3728
3729         if (blank_state != blank_normal_wait)
3730                 return;
3731         blank_state = blank_off;
3732
3733         /* don't blank graphics */
3734         if (vc->vc_mode != KD_TEXT) {
3735                 console_blanked = fg_console + 1;
3736                 return;
3737         }
3738
3739         hide_cursor(vc);
3740         del_timer_sync(&console_timer);
3741         blank_timer_expired = 0;
3742
3743         save_screen(vc);
3744         /* In case we need to reset origin, blanking hook returns 1 */
3745         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3746         console_blanked = fg_console + 1;
3747         if (i)
3748                 set_origin(vc);
3749
3750         if (console_blank_hook && console_blank_hook(1))
3751                 return;
3752
3753         if (vesa_off_interval && vesa_blank_mode) {
3754                 blank_state = blank_vesa_wait;
3755                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3756         }
3757         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3758 }
3759 EXPORT_SYMBOL(do_blank_screen);
3760
3761 /*
3762  * Called by timer as well as from vt_console_driver
3763  */
3764 void do_unblank_screen(int leaving_gfx)
3765 {
3766         struct vc_data *vc;
3767
3768         /* This should now always be called from a "sane" (read: can schedule)
3769          * context for the sake of the low level drivers, except in the special
3770          * case of oops_in_progress
3771          */
3772         if (!oops_in_progress)
3773                 might_sleep();
3774
3775         WARN_CONSOLE_UNLOCKED();
3776
3777         ignore_poke = 0;
3778         if (!console_blanked)
3779                 return;
3780         if (!vc_cons_allocated(fg_console)) {
3781                 /* impossible */
3782                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3783                 return;
3784         }
3785         vc = vc_cons[fg_console].d;
3786         if (vc->vc_mode != KD_TEXT)
3787                 return; /* but leave console_blanked != 0 */
3788
3789         if (blankinterval) {
3790                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3791                 blank_state = blank_normal_wait;
3792         }
3793
3794         console_blanked = 0;
3795         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3796                 /* Low-level driver cannot restore -> do it ourselves */
3797                 update_screen(vc);
3798         if (console_blank_hook)
3799                 console_blank_hook(0);
3800         set_palette(vc);
3801         set_cursor(vc);
3802         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3803 }
3804 EXPORT_SYMBOL(do_unblank_screen);
3805
3806 /*
3807  * This is called by the outside world to cause a forced unblank, mostly for
3808  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3809  * call it with 1 as an argument and so force a mode restore... that may kill
3810  * X or at least garbage the screen but would also make the Oops visible...
3811  */
3812 void unblank_screen(void)
3813 {
3814         do_unblank_screen(0);
3815 }
3816
3817 /*
3818  * We defer the timer blanking to work queue so it can take the console mutex
3819  * (console operations can still happen at irq time, but only from printk which
3820  * has the console mutex. Not perfect yet, but better than no locking
3821  */
3822 static void blank_screen_t(unsigned long dummy)
3823 {
3824         if (unlikely(!keventd_up())) {
3825                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3826                 return;
3827         }
3828         blank_timer_expired = 1;
3829         schedule_work(&console_work);
3830 }
3831
3832 void poke_blanked_console(void)
3833 {
3834         WARN_CONSOLE_UNLOCKED();
3835
3836         /* Add this so we quickly catch whoever might call us in a non
3837          * safe context. Nowadays, unblank_screen() isn't to be called in
3838          * atomic contexts and is allowed to schedule (with the special case
3839          * of oops_in_progress, but that isn't of any concern for this
3840          * function. --BenH.
3841          */
3842         might_sleep();
3843
3844         /* This isn't perfectly race free, but a race here would be mostly harmless,
3845          * at worse, we'll do a spurrious blank and it's unlikely
3846          */
3847         del_timer(&console_timer);
3848         blank_timer_expired = 0;
3849
3850         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3851                 return;
3852         if (console_blanked)
3853                 unblank_screen();
3854         else if (blankinterval) {
3855                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3856                 blank_state = blank_normal_wait;
3857         }
3858 }
3859
3860 /*
3861  *      Palettes
3862  */
3863
3864 static void set_palette(struct vc_data *vc)
3865 {
3866         WARN_CONSOLE_UNLOCKED();
3867
3868         if (vc->vc_mode != KD_GRAPHICS)
3869                 vc->vc_sw->con_set_palette(vc, color_table);
3870 }
3871
3872 static int set_get_cmap(unsigned char __user *arg, int set)
3873 {
3874     int i, j, k;
3875
3876     WARN_CONSOLE_UNLOCKED();
3877
3878     for (i = 0; i < 16; i++)
3879         if (set) {
3880             get_user(default_red[i], arg++);
3881             get_user(default_grn[i], arg++);
3882             get_user(default_blu[i], arg++);
3883         } else {
3884             put_user(default_red[i], arg++);
3885             put_user(default_grn[i], arg++);
3886             put_user(default_blu[i], arg++);
3887         }
3888     if (set) {
3889         for (i = 0; i < MAX_NR_CONSOLES; i++)
3890             if (vc_cons_allocated(i)) {
3891                 for (j = k = 0; j < 16; j++) {
3892                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3893                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3894                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3895                 }
3896                 set_palette(vc_cons[i].d);
3897             }
3898     }
3899     return 0;
3900 }
3901
3902 /*
3903  * Load palette into the DAC registers. arg points to a colour
3904  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3905  */
3906
3907 int con_set_cmap(unsigned char __user *arg)
3908 {
3909         int rc;
3910
3911         acquire_console_sem();
3912         rc = set_get_cmap (arg,1);
3913         release_console_sem();
3914
3915         return rc;
3916 }
3917
3918 int con_get_cmap(unsigned char __user *arg)
3919 {
3920         int rc;
3921
3922         acquire_console_sem();
3923         rc = set_get_cmap (arg,0);
3924         release_console_sem();
3925
3926         return rc;
3927 }
3928
3929 void reset_palette(struct vc_data *vc)
3930 {
3931         int j, k;
3932         for (j=k=0; j<16; j++) {
3933                 vc->vc_palette[k++] = default_red[j];
3934                 vc->vc_palette[k++] = default_grn[j];
3935                 vc->vc_palette[k++] = default_blu[j];
3936         }
3937         set_palette(vc);
3938 }
3939
3940 /*
3941  *  Font switching
3942  *
3943  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3944  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3945  *  depending on width) reserved for each character which is kinda wasty, but
3946  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3947  *  is upto the actual low-level console-driver convert data into its favorite
3948  *  format (maybe we should add a `fontoffset' field to the `display'
3949  *  structure so we won't have to convert the fontdata all the time.
3950  *  /Jes
3951  */
3952
3953 #define max_font_size 65536
3954
3955 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3956 {
3957         struct console_font font;
3958         int rc = -EINVAL;
3959         int c;
3960
3961         if (vc->vc_mode != KD_TEXT)
3962                 return -EINVAL;
3963
3964         if (op->data) {
3965                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3966                 if (!font.data)
3967                         return -ENOMEM;
3968         } else
3969                 font.data = NULL;
3970
3971         acquire_console_sem();
3972         if (vc->vc_sw->con_font_get)
3973                 rc = vc->vc_sw->con_font_get(vc, &font);
3974         else
3975                 rc = -ENOSYS;
3976         release_console_sem();
3977
3978         if (rc)
3979                 goto out;
3980
3981         c = (font.width+7)/8 * 32 * font.charcount;
3982
3983         if (op->data && font.charcount > op->charcount)
3984                 rc = -ENOSPC;
3985         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3986                 if (font.width > op->width || font.height > op->height)
3987                         rc = -ENOSPC;
3988         } else {
3989                 if (font.width != 8)
3990                         rc = -EIO;
3991                 else if ((op->height && font.height > op->height) ||
3992                          font.height > 32)
3993                         rc = -ENOSPC;
3994         }
3995         if (rc)
3996                 goto out;
3997
3998         op->height = font.height;
3999         op->width = font.width;
4000         op->charcount = font.charcount;
4001
4002         if (op->data && copy_to_user(op->data, font.data, c))
4003                 rc = -EFAULT;
4004
4005 out:
4006         kfree(font.data);
4007         return rc;
4008 }
4009
4010 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4011 {
4012         struct console_font font;
4013         int rc = -EINVAL;
4014         int size;
4015
4016         if (vc->vc_mode != KD_TEXT)
4017                 return -EINVAL;
4018         if (!op->data)
4019                 return -EINVAL;
4020         if (op->charcount > 512)
4021                 return -EINVAL;
4022         if (!op->height) {              /* Need to guess font height [compat] */
4023                 int h, i;
4024                 u8 __user *charmap = op->data;
4025                 u8 tmp;
4026
4027                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4028                    so that we can get rid of this soon */
4029                 if (!(op->flags & KD_FONT_FLAG_OLD))
4030                         return -EINVAL;
4031                 for (h = 32; h > 0; h--)
4032                         for (i = 0; i < op->charcount; i++) {
4033                                 if (get_user(tmp, &charmap[32*i+h-1]))
4034                                         return -EFAULT;
4035                                 if (tmp)
4036                                         goto nonzero;
4037                         }
4038                 return -EINVAL;
4039         nonzero:
4040                 op->height = h;
4041         }
4042         if (op->width <= 0 || op->width > 32 || op->height > 32)
4043                 return -EINVAL;
4044         size = (op->width+7)/8 * 32 * op->charcount;
4045         if (size > max_font_size)
4046                 return -ENOSPC;
4047         font.charcount = op->charcount;
4048         font.height = op->height;
4049         font.width = op->width;
4050         font.data = memdup_user(op->data, size);
4051         if (IS_ERR(font.data))
4052                 return PTR_ERR(font.data);
4053         acquire_console_sem();
4054         if (vc->vc_sw->con_font_set)
4055                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4056         else
4057                 rc = -ENOSYS;
4058         release_console_sem();
4059         kfree(font.data);
4060         return rc;
4061 }
4062
4063 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4064 {
4065         struct console_font font = {.width = op->width, .height = op->height};
4066         char name[MAX_FONT_NAME];
4067         char *s = name;
4068         int rc;
4069
4070         if (vc->vc_mode != KD_TEXT)
4071                 return -EINVAL;
4072
4073         if (!op->data)
4074                 s = NULL;
4075         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4076                 return -EFAULT;
4077         else
4078                 name[MAX_FONT_NAME - 1] = 0;
4079
4080         acquire_console_sem();
4081         if (vc->vc_sw->con_font_default)
4082                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4083         else
4084                 rc = -ENOSYS;
4085         release_console_sem();
4086         if (!rc) {
4087                 op->width = font.width;
4088                 op->height = font.height;
4089         }
4090         return rc;
4091 }
4092
4093 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4094 {
4095         int con = op->height;
4096         int rc;
4097
4098         if (vc->vc_mode != KD_TEXT)
4099                 return -EINVAL;
4100
4101         acquire_console_sem();
4102         if (!vc->vc_sw->con_font_copy)
4103                 rc = -ENOSYS;
4104         else if (con < 0 || !vc_cons_allocated(con))
4105                 rc = -ENOTTY;
4106         else if (con == vc->vc_num)     /* nothing to do */
4107                 rc = 0;
4108         else
4109                 rc = vc->vc_sw->con_font_copy(vc, con);
4110         release_console_sem();
4111         return rc;
4112 }
4113
4114 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4115 {
4116         switch (op->op) {
4117         case KD_FONT_OP_SET:
4118                 return con_font_set(vc, op);
4119         case KD_FONT_OP_GET:
4120                 return con_font_get(vc, op);
4121         case KD_FONT_OP_SET_DEFAULT:
4122                 return con_font_default(vc, op);
4123         case KD_FONT_OP_COPY:
4124                 return con_font_copy(vc, op);
4125         }
4126         return -ENOSYS;
4127 }
4128
4129 /*
4130  *      Interface exported to selection and vcs.
4131  */
4132
4133 /* used by selection */
4134 u16 screen_glyph(struct vc_data *vc, int offset)
4135 {
4136         u16 w = scr_readw(screenpos(vc, offset, 1));
4137         u16 c = w & 0xff;
4138
4139         if (w & vc->vc_hi_font_mask)
4140                 c |= 0x100;
4141         return c;
4142 }
4143 EXPORT_SYMBOL_GPL(screen_glyph);
4144
4145 /* used by vcs - note the word offset */
4146 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4147 {
4148         return screenpos(vc, 2 * w_offset, viewed);
4149 }
4150
4151 void getconsxy(struct vc_data *vc, unsigned char *p)
4152 {
4153         p[0] = vc->vc_x;
4154         p[1] = vc->vc_y;
4155 }
4156
4157 void putconsxy(struct vc_data *vc, unsigned char *p)
4158 {
4159         hide_cursor(vc);
4160         gotoxy(vc, p[0], p[1]);
4161         set_cursor(vc);
4162 }
4163
4164 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4165 {
4166         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4167                 return softcursor_original;
4168         return scr_readw(org);
4169 }
4170
4171 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4172 {
4173         scr_writew(val, org);
4174         if ((unsigned long)org == vc->vc_pos) {
4175                 softcursor_original = -1;
4176                 add_softcursor(vc);
4177         }
4178 }
4179
4180 /*
4181  *      Visible symbols for modules
4182  */
4183
4184 EXPORT_SYMBOL(color_table);
4185 EXPORT_SYMBOL(default_red);
4186 EXPORT_SYMBOL(default_grn);
4187 EXPORT_SYMBOL(default_blu);
4188 EXPORT_SYMBOL(update_region);
4189 EXPORT_SYMBOL(redraw_screen);
4190 EXPORT_SYMBOL(vc_resize);
4191 EXPORT_SYMBOL(fg_console);
4192 EXPORT_SYMBOL(console_blank_hook);
4193 EXPORT_SYMBOL(console_blanked);
4194 EXPORT_SYMBOL(vc_cons);
4195 EXPORT_SYMBOL(global_cursor_default);
4196 #ifndef VT_SINGLE_DRIVER
4197 EXPORT_SYMBOL(take_over_console);
4198 EXPORT_SYMBOL(give_up_console);
4199 #endif