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