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 #include <linux/ctype.h>
 109
 110 #define MAX_NR_CON_DRIVER 16
 111
 112 #define CON_DRIVER_FLAG_MODULE 1
 113 #define CON_DRIVER_FLAG_INIT   2
 114 #define CON_DRIVER_FLAG_ATTR   4
 115
 116 struct con_driver {
 117         const struct consw *con;
 118         const char *desc;
 119         struct device *dev;
 120         int node;
 121         int first;
 122         int last;
 123         int flag;
 124 };
 125
 126 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 127 const struct consw *conswitchp;
 128
 129 /* A bitmap for codes <32. A bit of 1 indicates that the code
 130  * corresponding to that bit number invokes some special action
 131  * (such as cursor movement) and should not be displayed as a
 132  * glyph unless the disp_ctrl mode is explicitly enabled.
 133  */
 134 #define CTRL_ACTION 0x0d00ff81
 135 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 136
 137 /*
 138  * Here is the default bell parameters: 750HZ, 1/8th of a second
 139  */
 140 #define DEFAULT_BELL_PITCH      750
 141 #define DEFAULT_BELL_DURATION   (HZ/8)
 142
 143 struct vc vc_cons [MAX_NR_CONSOLES];
 144
 145 #ifndef VT_SINGLE_DRIVER
 146 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 147 #endif
 148
 149 static int con_open(struct tty_struct *, struct file *);
 150 static void vc_init(struct vc_data *vc, unsigned int rows,
 151                     unsigned int cols, int do_clear);
 152 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 153 static void save_cur(struct vc_data *vc);
 154 static void reset_terminal(struct vc_data *vc, int do_clear);
 155 static void con_flush_chars(struct tty_struct *tty);
 156 static int set_vesa_blanking(char __user *p);
 157 static void set_cursor(struct vc_data *vc);
 158 static void hide_cursor(struct vc_data *vc);
 159 static void console_callback(struct work_struct *ignored);
 160 static void blank_screen_t(unsigned long dummy);
 161 static void set_palette(struct vc_data *vc);
 162
 163 static int printable;           /* Is console ready for printing? */
 164 int default_utf8 = true;
 165 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 166 int global_cursor_default = -1;
 167 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 168
 169 static int cur_default = CUR_DEFAULT;
 170 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 171
 172 /*
 173  * ignore_poke: don't unblank the screen when things are typed.  This is
 174  * mainly for the privacy of braille terminal users.
 175  */
 176 static int ignore_poke;
 177
 178 int do_poke_blanked_console;
 179 int console_blanked;
 180
 181 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 182 static int vesa_off_interval;
 183 static int blankinterval = 10*60;
 184 core_param(consoleblank, blankinterval, int, 0444);
 185
 186 static DECLARE_WORK(console_work, console_callback);
 187
 188 /*
 189  * fg_console is the current virtual console,
 190  * last_console is the last used one,
 191  * want_console is the console we want to switch to,
 192  * saved_* variants are for save/restore around kernel debugger enter/leave
 193  */
 194 int fg_console;
 195 int last_console;
 196 int want_console = -1;
 197 int saved_fg_console;
 198 int saved_last_console;
 199 int saved_want_console;
 200 int saved_vc_mode;
 201
 202 /*
 203  * For each existing display, we have a pointer to console currently visible
 204  * on that display, allowing consoles other than fg_console to be refreshed
 205  * appropriately. Unless the low-level driver supplies its own display_fg
 206  * variable, we use this one for the "master display".
 207  */
 208 static struct vc_data *master_display_fg;
 209
 210 /*
 211  * Unfortunately, we need to delay tty echo when we're currently writing to the
 212  * console since the code is (and always was) not re-entrant, so we schedule
 213  * all flip requests to process context with schedule-task() and run it from
 214  * console_callback().
 215  */
 216
 217 /*
 218  * For the same reason, we defer scrollback to the console callback.
 219  */
 220 static int scrollback_delta;
 221
 222 /*
 223  * Hook so that the power management routines can (un)blank
 224  * the console on our behalf.
 225  */
 226 int (*console_blank_hook)(int);
 227
 228 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 229 static int blank_state;
 230 static int blank_timer_expired;
 231 enum {
 232         blank_off = 0,
 233         blank_normal_wait,
 234         blank_vesa_wait,
 235 };
 236
 237 /*
 238  * Notifier list for console events.
 239  */
 240 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 241
 242 int register_vt_notifier(struct notifier_block *nb)
 243 {
 244         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 245 }
 246 EXPORT_SYMBOL_GPL(register_vt_notifier);
 247
 248 int unregister_vt_notifier(struct notifier_block *nb)
 249 {
 250         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 251 }
 252 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 253
 254 static void notify_write(struct vc_data *vc, unsigned int unicode)
 255 {
 256         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 257         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 258 }
 259
 260 static void notify_update(struct vc_data *vc)
 261 {
 262         struct vt_notifier_param param = { .vc = vc };
 263         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 264 }
 265 /*
 266  *      Low-Level Functions
 267  */
 268
 269 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 270
 271 #ifdef VT_BUF_VRAM_ONLY
 272 #define DO_UPDATE(vc)   0
 273 #else
 274 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 275 #endif
 276
 277 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 278 {
 279         unsigned short *p;
 280
 281         if (!viewed)
 282                 p = (unsigned short *)(vc->vc_origin + offset);
 283         else if (!vc->vc_sw->con_screen_pos)
 284                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 285         else
 286                 p = vc->vc_sw->con_screen_pos(vc, offset);
 287         return p;
 288 }
 289
 290 /* Called  from the keyboard irq path.. */
 291 static inline void scrolldelta(int lines)
 292 {
 293         /* FIXME */
 294         /* scrolldelta needs some kind of consistency lock, but the BKL was
 295            and still is not protecting versus the scheduled back end */
 296         scrollback_delta += lines;
 297         schedule_console_callback();
 298 }
 299
 300 void schedule_console_callback(void)
 301 {
 302         schedule_work(&console_work);
 303 }
 304
 305 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 306 {
 307         unsigned short *d, *s;
 308
 309         if (t+nr >= b)
 310                 nr = b - t - 1;
 311         if (b > vc->vc_rows || t >= b || nr < 1)
 312                 return;
 313         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 314                 return;
 315         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 316         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 317         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 318         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 319                     vc->vc_size_row * nr);
 320 }
 321
 322 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 323 {
 324         unsigned short *s;
 325         unsigned int step;
 326
 327         if (t+nr >= b)
 328                 nr = b - t - 1;
 329         if (b > vc->vc_rows || t >= b || nr < 1)
 330                 return;
 331         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 332                 return;
 333         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 334         step = vc->vc_cols * nr;
 335         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 336         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 337 }
 338
 339 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 340 {
 341 #ifndef VT_BUF_VRAM_ONLY
 342         unsigned int xx, yy, offset;
 343         u16 *p;
 344
 345         p = (u16 *) start;
 346         if (!vc->vc_sw->con_getxy) {
 347                 offset = (start - vc->vc_origin) / 2;
 348                 xx = offset % vc->vc_cols;
 349                 yy = offset / vc->vc_cols;
 350         } else {
 351                 int nxx, nyy;
 352                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 353                 xx = nxx; yy = nyy;
 354         }
 355         for(;;) {
 356                 u16 attrib = scr_readw(p) & 0xff00;
 357                 int startx = xx;
 358                 u16 *q = p;
 359                 while (xx < vc->vc_cols && count) {
 360                         if (attrib != (scr_readw(p) & 0xff00)) {
 361                                 if (p > q)
 362                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 363                                 startx = xx;
 364                                 q = p;
 365                                 attrib = scr_readw(p) & 0xff00;
 366                         }
 367                         p++;
 368                         xx++;
 369                         count--;
 370                 }
 371                 if (p > q)
 372                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 373                 if (!count)
 374                         break;
 375                 xx = 0;
 376                 yy++;
 377                 if (vc->vc_sw->con_getxy) {
 378                         p = (u16 *)start;
 379                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 380                 }
 381         }
 382 #endif
 383 }
 384
 385 void update_region(struct vc_data *vc, unsigned long start, int count)
 386 {
 387         WARN_CONSOLE_UNLOCKED();
 388
 389         if (DO_UPDATE(vc)) {
 390                 hide_cursor(vc);
 391                 do_update_region(vc, start, count);
 392                 set_cursor(vc);
 393         }
 394 }
 395
 396 /* Structure of attributes is hardware-dependent */
 397
 398 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 399     u8 _underline, u8 _reverse, u8 _italic)
 400 {
 401         if (vc->vc_sw->con_build_attr)
 402                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 403                        _blink, _underline, _reverse, _italic);
 404
 405 #ifndef VT_BUF_VRAM_ONLY
 406 /*
 407  * ++roman: I completely changed the attribute format for monochrome
 408  * mode (!can_do_color). The formerly used MDA (monochrome display
 409  * adapter) format didn't allow the combination of certain effects.
 410  * Now the attribute is just a bit vector:
 411  *  Bit 0..1: intensity (0..2)
 412  *  Bit 2   : underline
 413  *  Bit 3   : reverse
 414  *  Bit 7   : blink
 415  */
 416         {
 417         u8 a = _color;
 418         if (!vc->vc_can_do_color)
 419                 return _intensity |
 420                        (_italic ? 2 : 0) |
 421                        (_underline ? 4 : 0) |
 422                        (_reverse ? 8 : 0) |
 423                        (_blink ? 0x80 : 0);
 424         if (_italic)
 425                 a = (a & 0xF0) | vc->vc_itcolor;
 426         else if (_underline)
 427                 a = (a & 0xf0) | vc->vc_ulcolor;
 428         else if (_intensity == 0)
 429                 a = (a & 0xf0) | vc->vc_ulcolor;
 430         if (_reverse)
 431                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 432         if (_blink)
 433                 a ^= 0x80;
 434         if (_intensity == 2)
 435                 a ^= 0x08;
 436         if (vc->vc_hi_font_mask == 0x100)
 437                 a <<= 1;
 438         return a;
 439         }
 440 #else
 441         return 0;
 442 #endif
 443 }
 444
 445 static void update_attr(struct vc_data *vc)
 446 {
 447         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 448                       vc->vc_blink, vc->vc_underline,
 449                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 450         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 451 }
 452
 453 /* Note: inverting the screen twice should revert to the original state */
 454 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 455 {
 456         unsigned short *p;
 457
 458         WARN_CONSOLE_UNLOCKED();
 459
 460         count /= 2;
 461         p = screenpos(vc, offset, viewed);
 462         if (vc->vc_sw->con_invert_region)
 463                 vc->vc_sw->con_invert_region(vc, p, count);
 464 #ifndef VT_BUF_VRAM_ONLY
 465         else {
 466                 u16 *q = p;
 467                 int cnt = count;
 468                 u16 a;
 469
 470                 if (!vc->vc_can_do_color) {
 471                         while (cnt--) {
 472                             a = scr_readw(q);
 473                             a ^= 0x0800;
 474                             scr_writew(a, q);
 475                             q++;
 476                         }
 477                 } else if (vc->vc_hi_font_mask == 0x100) {
 478                         while (cnt--) {
 479                                 a = scr_readw(q);
 480                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 481                                 scr_writew(a, q);
 482                                 q++;
 483                         }
 484                 } else {
 485                         while (cnt--) {
 486                                 a = scr_readw(q);
 487                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 488                                 scr_writew(a, q);
 489                                 q++;
 490                         }
 491                 }
 492         }
 493 #endif
 494         if (DO_UPDATE(vc))
 495                 do_update_region(vc, (unsigned long) p, count);
 496 }
 497
 498 /* used by selection: complement pointer position */
 499 void complement_pos(struct vc_data *vc, int offset)
 500 {
 501         static int old_offset = -1;
 502         static unsigned short old;
 503         static unsigned short oldx, oldy;
 504
 505         WARN_CONSOLE_UNLOCKED();
 506
 507         if (old_offset != -1 && old_offset >= 0 &&
 508             old_offset < vc->vc_screenbuf_size) {
 509                 scr_writew(old, screenpos(vc, old_offset, 1));
 510                 if (DO_UPDATE(vc))
 511                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 512         }
 513
 514         old_offset = offset;
 515
 516         if (offset != -1 && offset >= 0 &&
 517             offset < vc->vc_screenbuf_size) {
 518                 unsigned short new;
 519                 unsigned short *p;
 520                 p = screenpos(vc, offset, 1);
 521                 old = scr_readw(p);
 522                 new = old ^ vc->vc_complement_mask;
 523                 scr_writew(new, p);
 524                 if (DO_UPDATE(vc)) {
 525                         oldx = (offset >> 1) % vc->vc_cols;
 526                         oldy = (offset >> 1) / vc->vc_cols;
 527                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 528                 }
 529         }
 530
 531 }
 532
 533 static void insert_char(struct vc_data *vc, unsigned int nr)
 534 {
 535         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 536
 537         p = q + vc->vc_cols - nr - vc->vc_x;
 538         while (--p >= q)
 539                 scr_writew(scr_readw(p), p + nr);
 540         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 541         vc->vc_need_wrap = 0;
 542         if (DO_UPDATE(vc)) {
 543                 unsigned short oldattr = vc->vc_attr;
 544                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 545                                      vc->vc_cols - vc->vc_x - nr);
 546                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 547                 while (nr--)
 548                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 549                 vc->vc_attr = oldattr;
 550         }
 551 }
 552
 553 static void delete_char(struct vc_data *vc, unsigned int nr)
 554 {
 555         unsigned int i = vc->vc_x;
 556         unsigned short *p = (unsigned short *)vc->vc_pos;
 557
 558         while (++i <= vc->vc_cols - nr) {
 559                 scr_writew(scr_readw(p+nr), p);
 560                 p++;
 561         }
 562         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 563         vc->vc_need_wrap = 0;
 564         if (DO_UPDATE(vc)) {
 565                 unsigned short oldattr = vc->vc_attr;
 566                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 567                                      vc->vc_cols - vc->vc_x - nr);
 568                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 569                 while (nr--)
 570                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 571                                      vc->vc_cols - 1 - nr);
 572                 vc->vc_attr = oldattr;
 573         }
 574 }
 575
 576 static int softcursor_original;
 577
 578 static void add_softcursor(struct vc_data *vc)
 579 {
 580         int i = scr_readw((u16 *) vc->vc_pos);
 581         u32 type = vc->vc_cursor_type;
 582
 583         if (! (type & 0x10)) return;
 584         if (softcursor_original != -1) return;
 585         softcursor_original = i;
 586         i |= ((type >> 8) & 0xff00 );
 587         i ^= ((type) & 0xff00 );
 588         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 589         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 590         scr_writew(i, (u16 *) vc->vc_pos);
 591         if (DO_UPDATE(vc))
 592                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 593 }
 594
 595 static void hide_softcursor(struct vc_data *vc)
 596 {
 597         if (softcursor_original != -1) {
 598                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 599                 if (DO_UPDATE(vc))
 600                         vc->vc_sw->con_putc(vc, softcursor_original,
 601                                         vc->vc_y, vc->vc_x);
 602                 softcursor_original = -1;
 603         }
 604 }
 605
 606 static void hide_cursor(struct vc_data *vc)
 607 {
 608         if (vc == sel_cons)
 609                 clear_selection();
 610         vc->vc_sw->con_cursor(vc, CM_ERASE);
 611         hide_softcursor(vc);
 612 }
 613
 614 static void set_cursor(struct vc_data *vc)
 615 {
 616         if (!IS_FG(vc) || console_blanked ||
 617             vc->vc_mode == KD_GRAPHICS)
 618                 return;
 619         if (vc->vc_deccm) {
 620                 if (vc == sel_cons)
 621                         clear_selection();
 622                 add_softcursor(vc);
 623                 if ((vc->vc_cursor_type & 0x0f) != 1)
 624                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 625         } else
 626                 hide_cursor(vc);
 627 }
 628
 629 static void set_origin(struct vc_data *vc)
 630 {
 631         WARN_CONSOLE_UNLOCKED();
 632
 633         if (!CON_IS_VISIBLE(vc) ||
 634             !vc->vc_sw->con_set_origin ||
 635             !vc->vc_sw->con_set_origin(vc))
 636                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 637         vc->vc_visible_origin = vc->vc_origin;
 638         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 639         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 640 }
 641
 642 static inline void save_screen(struct vc_data *vc)
 643 {
 644         WARN_CONSOLE_UNLOCKED();
 645
 646         if (vc->vc_sw->con_save_screen)
 647                 vc->vc_sw->con_save_screen(vc);
 648 }
 649
 650 /*
 651  *      Redrawing of screen
 652  */
 653
 654 static void clear_buffer_attributes(struct vc_data *vc)
 655 {
 656         unsigned short *p = (unsigned short *)vc->vc_origin;
 657         int count = vc->vc_screenbuf_size / 2;
 658         int mask = vc->vc_hi_font_mask | 0xff;
 659
 660         for (; count > 0; count--, p++) {
 661                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 662         }
 663 }
 664
 665 void redraw_screen(struct vc_data *vc, int is_switch)
 666 {
 667         int redraw = 0;
 668
 669         WARN_CONSOLE_UNLOCKED();
 670
 671         if (!vc) {
 672                 /* strange ... */
 673                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 674                 return;
 675         }
 676
 677         if (is_switch) {
 678                 struct vc_data *old_vc = vc_cons[fg_console].d;
 679                 if (old_vc == vc)
 680                         return;
 681                 if (!CON_IS_VISIBLE(vc))
 682                         redraw = 1;
 683                 *vc->vc_display_fg = vc;
 684                 fg_console = vc->vc_num;
 685                 hide_cursor(old_vc);
 686                 if (!CON_IS_VISIBLE(old_vc)) {
 687                         save_screen(old_vc);
 688                         set_origin(old_vc);
 689                 }
 690         } else {
 691                 hide_cursor(vc);
 692                 redraw = 1;
 693         }
 694
 695         if (redraw) {
 696                 int update;
 697                 int old_was_color = vc->vc_can_do_color;
 698
 699                 set_origin(vc);
 700                 update = vc->vc_sw->con_switch(vc);
 701                 set_palette(vc);
 702                 /*
 703                  * If console changed from mono<->color, the best we can do
 704                  * is to clear the buffer attributes. As it currently stands,
 705                  * rebuilding new attributes from the old buffer is not doable
 706                  * without overly complex code.
 707                  */
 708                 if (old_was_color != vc->vc_can_do_color) {
 709                         update_attr(vc);
 710                         clear_buffer_attributes(vc);
 711                 }
 712
 713                 /* Forcibly update if we're panicing */
 714                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 715                     vt_force_oops_output(vc))
 716                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 717         }
 718         set_cursor(vc);
 719         if (is_switch) {
 720                 set_leds();
 721                 compute_shiftstate();
 722                 notify_update(vc);
 723         }
 724 }
 725
 726 /*
 727  *      Allocation, freeing and resizing of VTs.
 728  */
 729
 730 int vc_cons_allocated(unsigned int i)
 731 {
 732         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 733 }
 734
 735 static void visual_init(struct vc_data *vc, int num, int init)
 736 {
 737         /* ++Geert: vc->vc_sw->con_init determines console size */
 738         if (vc->vc_sw)
 739                 module_put(vc->vc_sw->owner);
 740         vc->vc_sw = conswitchp;
 741 #ifndef VT_SINGLE_DRIVER
 742         if (con_driver_map[num])
 743                 vc->vc_sw = con_driver_map[num];
 744 #endif
 745         __module_get(vc->vc_sw->owner);
 746         vc->vc_num = num;
 747         vc->vc_display_fg = &master_display_fg;
 748         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 749         vc->vc_uni_pagedir = 0;
 750         vc->vc_hi_font_mask = 0;
 751         vc->vc_complement_mask = 0;
 752         vc->vc_can_do_color = 0;
 753         vc->vc_panic_force_write = false;
 754         vc->vc_sw->con_init(vc, init);
 755         if (!vc->vc_complement_mask)
 756                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 757         vc->vc_s_complement_mask = vc->vc_complement_mask;
 758         vc->vc_size_row = vc->vc_cols << 1;
 759         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 760 }
 761
 762 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 763 {
 764         WARN_CONSOLE_UNLOCKED();
 765
 766         if (currcons >= MAX_NR_CONSOLES)
 767                 return -ENXIO;
 768         if (!vc_cons[currcons].d) {
 769             struct vc_data *vc;
 770             struct vt_notifier_param param;
 771
 772             /* prevent users from taking too much memory */
 773             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 774               return -EPERM;
 775
 776             /* due to the granularity of kmalloc, we waste some memory here */
 777             /* the alloc is done in two steps, to optimize the common situation
 778                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 779             /* although the numbers above are not valid since long ago, the
 780                point is still up-to-date and the comment still has its value
 781                even if only as a historical artifact.  --mj, July 1998 */
 782             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 783             if (!vc)
 784                 return -ENOMEM;
 785             vc_cons[currcons].d = vc;
 786             tty_port_init(&vc->port);
 787             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 788             visual_init(vc, currcons, 1);
 789             if (!*vc->vc_uni_pagedir_loc)
 790                 con_set_default_unimap(vc);
 791             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 792             if (!vc->vc_screenbuf) {
 793                 kfree(vc);
 794                 vc_cons[currcons].d = NULL;
 795                 return -ENOMEM;
 796             }
 797
 798             /* If no drivers have overridden us and the user didn't pass a
 799                boot option, default to displaying the cursor */
 800             if (global_cursor_default == -1)
 801                     global_cursor_default = 1;
 802
 803             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 804             vcs_make_sysfs(currcons);
 805             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 806         }
 807         return 0;
 808 }
 809
 810 static inline int resize_screen(struct vc_data *vc, int width, int height,
 811                                 int user)
 812 {
 813         /* Resizes the resolution of the display adapater */
 814         int err = 0;
 815
 816         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 817                 err = vc->vc_sw->con_resize(vc, width, height, user);
 818
 819         return err;
 820 }
 821
 822 /*
 823  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 824  * [this is to be used together with some user program
 825  * like resize that changes the hardware videomode]
 826  */
 827 #define VC_RESIZE_MAXCOL (32767)
 828 #define VC_RESIZE_MAXROW (32767)
 829
 830 /**
 831  *      vc_do_resize    -       resizing method for the tty
 832  *      @tty: tty being resized
 833  *      @real_tty: real tty (different to tty if a pty/tty pair)
 834  *      @vc: virtual console private data
 835  *      @cols: columns
 836  *      @lines: lines
 837  *
 838  *      Resize a virtual console, clipping according to the actual constraints.
 839  *      If the caller passes a tty structure then update the termios winsize
 840  *      information and perform any necessary signal handling.
 841  *
 842  *      Caller must hold the console semaphore. Takes the termios mutex and
 843  *      ctrl_lock of the tty IFF a tty is passed.
 844  */
 845
 846 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 847                                 unsigned int cols, unsigned int lines)
 848 {
 849         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 850         unsigned long end;
 851         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 852         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 853         unsigned int user;
 854         unsigned short *newscreen;
 855
 856         WARN_CONSOLE_UNLOCKED();
 857
 858         if (!vc)
 859                 return -ENXIO;
 860
 861         user = vc->vc_resize_user;
 862         vc->vc_resize_user = 0;
 863
 864         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 865                 return -EINVAL;
 866
 867         new_cols = (cols ? cols : vc->vc_cols);
 868         new_rows = (lines ? lines : vc->vc_rows);
 869         new_row_size = new_cols << 1;
 870         new_screen_size = new_row_size * new_rows;
 871
 872         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 873                 return 0;
 874
 875         newscreen = kmalloc(new_screen_size, GFP_USER);
 876         if (!newscreen)
 877                 return -ENOMEM;
 878
 879         old_rows = vc->vc_rows;
 880         old_cols = vc->vc_cols;
 881         old_row_size = vc->vc_size_row;
 882         old_screen_size = vc->vc_screenbuf_size;
 883
 884         err = resize_screen(vc, new_cols, new_rows, user);
 885         if (err) {
 886                 kfree(newscreen);
 887                 return err;
 888         }
 889
 890         vc->vc_rows = new_rows;
 891         vc->vc_cols = new_cols;
 892         vc->vc_size_row = new_row_size;
 893         vc->vc_screenbuf_size = new_screen_size;
 894
 895         rlth = min(old_row_size, new_row_size);
 896         rrem = new_row_size - rlth;
 897         old_origin = vc->vc_origin;
 898         new_origin = (long) newscreen;
 899         new_scr_end = new_origin + new_screen_size;
 900
 901         if (vc->vc_y > new_rows) {
 902                 if (old_rows - vc->vc_y < new_rows) {
 903                         /*
 904                          * Cursor near the bottom, copy contents from the
 905                          * bottom of buffer
 906                          */
 907                         old_origin += (old_rows - new_rows) * old_row_size;
 908                         end = vc->vc_scr_end;
 909                 } else {
 910                         /*
 911                          * Cursor is in no man's land, copy 1/2 screenful
 912                          * from the top and bottom of cursor position
 913                          */
 914                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 915                         end = old_origin + (old_row_size * new_rows);
 916                 }
 917         } else
 918                 /*
 919                  * Cursor near the top, copy contents from the top of buffer
 920                  */
 921                 end = (old_rows > new_rows) ? old_origin +
 922                         (old_row_size * new_rows) :
 923                         vc->vc_scr_end;
 924
 925         update_attr(vc);
 926
 927         while (old_origin < end) {
 928                 scr_memcpyw((unsigned short *) new_origin,
 929                             (unsigned short *) old_origin, rlth);
 930                 if (rrem)
 931                         scr_memsetw((void *)(new_origin + rlth),
 932                                     vc->vc_video_erase_char, rrem);
 933                 old_origin += old_row_size;
 934                 new_origin += new_row_size;
 935         }
 936         if (new_scr_end > new_origin)
 937                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 938                             new_scr_end - new_origin);
 939         kfree(vc->vc_screenbuf);
 940         vc->vc_screenbuf = newscreen;
 941         vc->vc_screenbuf_size = new_screen_size;
 942         set_origin(vc);
 943
 944         /* do part of a reset_terminal() */
 945         vc->vc_top = 0;
 946         vc->vc_bottom = vc->vc_rows;
 947         gotoxy(vc, vc->vc_x, vc->vc_y);
 948         save_cur(vc);
 949
 950         if (tty) {
 951                 /* Rewrite the requested winsize data with the actual
 952                    resulting sizes */
 953                 struct winsize ws;
 954                 memset(&ws, 0, sizeof(ws));
 955                 ws.ws_row = vc->vc_rows;
 956                 ws.ws_col = vc->vc_cols;
 957                 ws.ws_ypixel = vc->vc_scan_lines;
 958                 tty_do_resize(tty, &ws);
 959         }
 960
 961         if (CON_IS_VISIBLE(vc))
 962                 update_screen(vc);
 963         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 964         return err;
 965 }
 966
 967 /**
 968  *      vc_resize               -       resize a VT
 969  *      @vc: virtual console
 970  *      @cols: columns
 971  *      @rows: rows
 972  *
 973  *      Resize a virtual console as seen from the console end of things. We
 974  *      use the common vc_do_resize methods to update the structures. The
 975  *      caller must hold the console sem to protect console internals and
 976  *      vc->port.tty
 977  */
 978
 979 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 980 {
 981         return vc_do_resize(vc->port.tty, vc, cols, rows);
 982 }
 983
 984 /**
 985  *      vt_resize               -       resize a VT
 986  *      @tty: tty to resize
 987  *      @ws: winsize attributes
 988  *
 989  *      Resize a virtual terminal. This is called by the tty layer as we
 990  *      register our own handler for resizing. The mutual helper does all
 991  *      the actual work.
 992  *
 993  *      Takes the console sem and the called methods then take the tty
 994  *      termios_mutex and the tty ctrl_lock in that order.
 995  */
 996 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 997 {
 998         struct vc_data *vc = tty->driver_data;
 999         int ret;
1000
1001         acquire_console_sem();
1002         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1003         release_console_sem();
1004         return ret;
1005 }
1006
1007 void vc_deallocate(unsigned int currcons)
1008 {
1009         WARN_CONSOLE_UNLOCKED();
1010
1011         if (vc_cons_allocated(currcons)) {
1012                 struct vc_data *vc = vc_cons[currcons].d;
1013                 struct vt_notifier_param param = { .vc = vc };
1014
1015                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1016                 vcs_remove_sysfs(currcons);
1017                 vc->vc_sw->con_deinit(vc);
1018                 put_pid(vc->vt_pid);
1019                 module_put(vc->vc_sw->owner);
1020                 kfree(vc->vc_screenbuf);
1021                 if (currcons >= MIN_NR_CONSOLES)
1022                         kfree(vc);
1023                 vc_cons[currcons].d = NULL;
1024         }
1025 }
1026
1027 /*
1028  *      VT102 emulator
1029  */
1030
1031 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1032 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1033 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1034
1035 #define decarm          VC_REPEAT
1036 #define decckm          VC_CKMODE
1037 #define kbdapplic       VC_APPLIC
1038 #define lnm             VC_CRLF
1039
1040 /*
1041  * this is what the terminal answers to a ESC-Z or csi0c query.
1042  */
1043 #define VT100ID "\033[?1;2c"
1044 #define VT102ID "\033[?6c"
1045
1046 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1047                                        8,12,10,14, 9,13,11,15 };
1048
1049 /* the default colour table, for VGA+ colour systems */
1050 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1051     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1052 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1053     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1054 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1055     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1056
1057 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1058 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1059 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1060
1061 /*
1062  * gotoxy() must verify all boundaries, because the arguments
1063  * might also be negative. If the given position is out of
1064  * bounds, the cursor is placed at the nearest margin.
1065  */
1066 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1067 {
1068         int min_y, max_y;
1069
1070         if (new_x < 0)
1071                 vc->vc_x = 0;
1072         else {
1073                 if (new_x >= vc->vc_cols)
1074                         vc->vc_x = vc->vc_cols - 1;
1075                 else
1076                         vc->vc_x = new_x;
1077         }
1078
1079         if (vc->vc_decom) {
1080                 min_y = vc->vc_top;
1081                 max_y = vc->vc_bottom;
1082         } else {
1083                 min_y = 0;
1084                 max_y = vc->vc_rows;
1085         }
1086         if (new_y < min_y)
1087                 vc->vc_y = min_y;
1088         else if (new_y >= max_y)
1089                 vc->vc_y = max_y - 1;
1090         else
1091                 vc->vc_y = new_y;
1092         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1093         vc->vc_need_wrap = 0;
1094 }
1095
1096 /* for absolute user moves, when decom is set */
1097 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1098 {
1099         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1100 }
1101
1102 void scrollback(struct vc_data *vc, int lines)
1103 {
1104         if (!lines)
1105                 lines = vc->vc_rows / 2;
1106         scrolldelta(-lines);
1107 }
1108
1109 void scrollfront(struct vc_data *vc, int lines)
1110 {
1111         if (!lines)
1112                 lines = vc->vc_rows / 2;
1113         scrolldelta(lines);
1114 }
1115
1116 static void lf(struct vc_data *vc)
1117 {
1118         /* don't scroll if above bottom of scrolling region, or
1119          * if below scrolling region
1120          */
1121         if (vc->vc_y + 1 == vc->vc_bottom)
1122                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1123         else if (vc->vc_y < vc->vc_rows - 1) {
1124                 vc->vc_y++;
1125                 vc->vc_pos += vc->vc_size_row;
1126         }
1127         vc->vc_need_wrap = 0;
1128         notify_write(vc, '\n');
1129 }
1130
1131 static void ri(struct vc_data *vc)
1132 {
1133         /* don't scroll if below top of scrolling region, or
1134          * if above scrolling region
1135          */
1136         if (vc->vc_y == vc->vc_top)
1137                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1138         else if (vc->vc_y > 0) {
1139                 vc->vc_y--;
1140                 vc->vc_pos -= vc->vc_size_row;
1141         }
1142         vc->vc_need_wrap = 0;
1143 }
1144
1145 static inline void cr(struct vc_data *vc)
1146 {
1147         vc->vc_pos -= vc->vc_x << 1;
1148         vc->vc_need_wrap = vc->vc_x = 0;
1149         notify_write(vc, '\r');
1150 }
1151
1152 static inline void bs(struct vc_data *vc)
1153 {
1154         if (vc->vc_x) {
1155                 vc->vc_pos -= 2;
1156                 vc->vc_x--;
1157                 vc->vc_need_wrap = 0;
1158                 notify_write(vc, '\b');
1159         }
1160 }
1161
1162 static inline void del(struct vc_data *vc)
1163 {
1164         /* ignored */
1165 }
1166
1167 static void csi_J(struct vc_data *vc, int vpar)
1168 {
1169         unsigned int count;
1170         unsigned short * start;
1171
1172         switch (vpar) {
1173                 case 0: /* erase from cursor to end of display */
1174                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1175                         start = (unsigned short *)vc->vc_pos;
1176                         if (DO_UPDATE(vc)) {
1177                                 /* do in two stages */
1178                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1179                                               vc->vc_cols - vc->vc_x);
1180                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1181                                               vc->vc_rows - vc->vc_y - 1,
1182                                               vc->vc_cols);
1183                         }
1184                         break;
1185                 case 1: /* erase from start to cursor */
1186                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1187                         start = (unsigned short *)vc->vc_origin;
1188                         if (DO_UPDATE(vc)) {
1189                                 /* do in two stages */
1190                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1191                                               vc->vc_cols);
1192                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1193                                               vc->vc_x + 1);
1194                         }
1195                         break;
1196                 case 2: /* erase whole display */
1197                         count = vc->vc_cols * vc->vc_rows;
1198                         start = (unsigned short *)vc->vc_origin;
1199                         if (DO_UPDATE(vc))
1200                                 vc->vc_sw->con_clear(vc, 0, 0,
1201                                               vc->vc_rows,
1202                                               vc->vc_cols);
1203                         break;
1204                 default:
1205                         return;
1206         }
1207         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1208         vc->vc_need_wrap = 0;
1209 }
1210
1211 static void csi_K(struct vc_data *vc, int vpar)
1212 {
1213         unsigned int count;
1214         unsigned short * start;
1215
1216         switch (vpar) {
1217                 case 0: /* erase from cursor to end of line */
1218                         count = vc->vc_cols - vc->vc_x;
1219                         start = (unsigned short *)vc->vc_pos;
1220                         if (DO_UPDATE(vc))
1221                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1222                                                      vc->vc_cols - vc->vc_x);
1223                         break;
1224                 case 1: /* erase from start of line to cursor */
1225                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1226                         count = vc->vc_x + 1;
1227                         if (DO_UPDATE(vc))
1228                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1229                                                      vc->vc_x + 1);
1230                         break;
1231                 case 2: /* erase whole line */
1232                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1233                         count = vc->vc_cols;
1234                         if (DO_UPDATE(vc))
1235                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1236                                               vc->vc_cols);
1237                         break;
1238                 default:
1239                         return;
1240         }
1241         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1242         vc->vc_need_wrap = 0;
1243 }
1244
1245 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1246 {                                         /* not vt100? */
1247         int count;
1248
1249         if (!vpar)
1250                 vpar++;
1251         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1252
1253         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1254         if (DO_UPDATE(vc))
1255                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1256         vc->vc_need_wrap = 0;
1257 }
1258
1259 static void default_attr(struct vc_data *vc)
1260 {
1261         vc->vc_intensity = 1;
1262         vc->vc_italic = 0;
1263         vc->vc_underline = 0;
1264         vc->vc_reverse = 0;
1265         vc->vc_blink = 0;
1266         vc->vc_color = vc->vc_def_color;
1267 }
1268
1269 /* console_sem is held */
1270 static void csi_m(struct vc_data *vc)
1271 {
1272         int i;
1273
1274         for (i = 0; i <= vc->vc_npar; i++)
1275                 switch (vc->vc_par[i]) {
1276                         case 0: /* all attributes off */
1277                                 default_attr(vc);
1278                                 break;
1279                         case 1:
1280                                 vc->vc_intensity = 2;
1281                                 break;
1282                         case 2:
1283                                 vc->vc_intensity = 0;
1284                                 break;
1285                         case 3:
1286                                 vc->vc_italic = 1;
1287                                 break;
1288                         case 4:
1289                                 vc->vc_underline = 1;
1290                                 break;
1291                         case 5:
1292                                 vc->vc_blink = 1;
1293                                 break;
1294                         case 7:
1295                                 vc->vc_reverse = 1;
1296                                 break;
1297                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1298                                   * Select primary font, don't display
1299                                   * control chars if defined, don't set
1300                                   * bit 8 on output.
1301                                   */
1302                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1303                                                 ? vc->vc_G0_charset
1304                                                 : vc->vc_G1_charset, vc);
1305                                 vc->vc_disp_ctrl = 0;
1306                                 vc->vc_toggle_meta = 0;
1307                                 break;
1308                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1309                                   * Select first alternate font, lets
1310                                   * chars < 32 be displayed as ROM chars.
1311                                   */
1312                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1313                                 vc->vc_disp_ctrl = 1;
1314                                 vc->vc_toggle_meta = 0;
1315                                 break;
1316                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1317                                   * Select second alternate font, toggle
1318                                   * high bit before displaying as ROM char.
1319                                   */
1320                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1321                                 vc->vc_disp_ctrl = 1;
1322                                 vc->vc_toggle_meta = 1;
1323                                 break;
1324                         case 21:
1325                         case 22:
1326                                 vc->vc_intensity = 1;
1327                                 break;
1328                         case 23:
1329                                 vc->vc_italic = 0;
1330                                 break;
1331                         case 24:
1332                                 vc->vc_underline = 0;
1333                                 break;
1334                         case 25:
1335                                 vc->vc_blink = 0;
1336                                 break;
1337                         case 27:
1338                                 vc->vc_reverse = 0;
1339                                 break;
1340                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1341                                   * Enables underscore, white foreground
1342                                   * with white underscore (Linux - use
1343                                   * default foreground).
1344                                   */
1345                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1346                                 vc->vc_underline = 1;
1347                                 break;
1348                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1349                                   * Disable underline option.
1350                                   * Reset colour to default? It did this
1351                                   * before...
1352                                   */
1353                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1354                                 vc->vc_underline = 0;
1355                                 break;
1356                         case 49:
1357                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1358                                 break;
1359                         default:
1360                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1361                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1362                                                 | (vc->vc_color & 0xf0);
1363                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1364                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1365                                                 | (vc->vc_color & 0x0f);
1366                                 break;
1367                 }
1368         update_attr(vc);
1369 }
1370
1371 static void respond_string(const char *p, struct tty_struct *tty)
1372 {
1373         while (*p) {
1374                 tty_insert_flip_char(tty, *p, 0);
1375                 p++;
1376         }
1377         con_schedule_flip(tty);
1378 }
1379
1380 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1381 {
1382         char buf[40];
1383
1384         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1385         respond_string(buf, tty);
1386 }
1387
1388 static inline void status_report(struct tty_struct *tty)
1389 {
1390         respond_string("\033[0n", tty); /* Terminal ok */
1391 }
1392
1393 static inline void respond_ID(struct tty_struct * tty)
1394 {
1395         respond_string(VT102ID, tty);
1396 }
1397
1398 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1399 {
1400         char buf[8];
1401
1402         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1403                 (char)('!' + mry));
1404         respond_string(buf, tty);
1405 }
1406
1407 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1408 int mouse_reporting(void)
1409 {
1410         return vc_cons[fg_console].d->vc_report_mouse;
1411 }
1412
1413 /* console_sem is held */
1414 static void set_mode(struct vc_data *vc, int on_off)
1415 {
1416         int i;
1417
1418         for (i = 0; i <= vc->vc_npar; i++)
1419                 if (vc->vc_ques) {
1420                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1421                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1422                                 if (on_off)
1423                                         set_kbd(vc, decckm);
1424                                 else
1425                                         clr_kbd(vc, decckm);
1426                                 break;
1427                         case 3: /* 80/132 mode switch unimplemented */
1428                                 vc->vc_deccolm = on_off;
1429 #if 0
1430                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1431                                 /* this alone does not suffice; some user mode
1432                                    utility has to change the hardware regs */
1433 #endif
1434                                 break;
1435                         case 5:                 /* Inverted screen on/off */
1436                                 if (vc->vc_decscnm != on_off) {
1437                                         vc->vc_decscnm = on_off;
1438                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1439                                         update_attr(vc);
1440                                 }
1441                                 break;
1442                         case 6:                 /* Origin relative/absolute */
1443                                 vc->vc_decom = on_off;
1444                                 gotoxay(vc, 0, 0);
1445                                 break;
1446                         case 7:                 /* Autowrap on/off */
1447                                 vc->vc_decawm = on_off;
1448                                 break;
1449                         case 8:                 /* Autorepeat on/off */
1450                                 if (on_off)
1451                                         set_kbd(vc, decarm);
1452                                 else
1453                                         clr_kbd(vc, decarm);
1454                                 break;
1455                         case 9:
1456                                 vc->vc_report_mouse = on_off ? 1 : 0;
1457                                 break;
1458                         case 25:                /* Cursor on/off */
1459                                 vc->vc_deccm = on_off;
1460                                 break;
1461                         case 1000:
1462                                 vc->vc_report_mouse = on_off ? 2 : 0;
1463                                 break;
1464                         }
1465                 } else {
1466                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1467                         case 3:                 /* Monitor (display ctrls) */
1468                                 vc->vc_disp_ctrl = on_off;
1469                                 break;
1470                         case 4:                 /* Insert Mode on/off */
1471                                 vc->vc_decim = on_off;
1472                                 break;
1473                         case 20:                /* Lf, Enter == CrLf/Lf */
1474                                 if (on_off)
1475                                         set_kbd(vc, lnm);
1476                                 else
1477                                         clr_kbd(vc, lnm);
1478                                 break;
1479                         }
1480                 }
1481 }
1482
1483 /* console_sem is held */
1484 static void setterm_command(struct vc_data *vc)
1485 {
1486         switch(vc->vc_par[0]) {
1487                 case 1: /* set color for underline mode */
1488                         if (vc->vc_can_do_color &&
1489                                         vc->vc_par[1] < 16) {
1490                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1491                                 if (vc->vc_underline)
1492                                         update_attr(vc);
1493                         }
1494                         break;
1495                 case 2: /* set color for half intensity mode */
1496                         if (vc->vc_can_do_color &&
1497                                         vc->vc_par[1] < 16) {
1498                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1499                                 if (vc->vc_intensity == 0)
1500                                         update_attr(vc);
1501                         }
1502                         break;
1503                 case 8: /* store colors as defaults */
1504                         vc->vc_def_color = vc->vc_attr;
1505                         if (vc->vc_hi_font_mask == 0x100)
1506                                 vc->vc_def_color >>= 1;
1507                         default_attr(vc);
1508                         update_attr(vc);
1509                         break;
1510                 case 9: /* set blanking interval */
1511                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1512                         poke_blanked_console();
1513                         break;
1514                 case 10: /* set bell frequency in Hz */
1515                         if (vc->vc_npar >= 1)
1516                                 vc->vc_bell_pitch = vc->vc_par[1];
1517                         else
1518                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1519                         break;
1520                 case 11: /* set bell duration in msec */
1521                         if (vc->vc_npar >= 1)
1522                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1523                                         vc->vc_par[1] * HZ / 1000 : 0;
1524                         else
1525                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1526                         break;
1527                 case 12: /* bring specified console to the front */
1528                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1529                                 set_console(vc->vc_par[1] - 1);
1530                         break;
1531                 case 13: /* unblank the screen */
1532                         poke_blanked_console();
1533                         break;
1534                 case 14: /* set vesa powerdown interval */
1535                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1536                         break;
1537                 case 15: /* activate the previous console */
1538                         set_console(last_console);
1539                         break;
1540         }
1541 }
1542
1543 /* console_sem is held */
1544 static void csi_at(struct vc_data *vc, unsigned int nr)
1545 {
1546         if (nr > vc->vc_cols - vc->vc_x)
1547                 nr = vc->vc_cols - vc->vc_x;
1548         else if (!nr)
1549                 nr = 1;
1550         insert_char(vc, nr);
1551 }
1552
1553 /* console_sem is held */
1554 static void csi_L(struct vc_data *vc, unsigned int nr)
1555 {
1556         if (nr > vc->vc_rows - vc->vc_y)
1557                 nr = vc->vc_rows - vc->vc_y;
1558         else if (!nr)
1559                 nr = 1;
1560         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1561         vc->vc_need_wrap = 0;
1562 }
1563
1564 /* console_sem is held */
1565 static void csi_P(struct vc_data *vc, unsigned int nr)
1566 {
1567         if (nr > vc->vc_cols - vc->vc_x)
1568                 nr = vc->vc_cols - vc->vc_x;
1569         else if (!nr)
1570                 nr = 1;
1571         delete_char(vc, nr);
1572 }
1573
1574 /* console_sem is held */
1575 static void csi_M(struct vc_data *vc, unsigned int nr)
1576 {
1577         if (nr > vc->vc_rows - vc->vc_y)
1578                 nr = vc->vc_rows - vc->vc_y;
1579         else if (!nr)
1580                 nr=1;
1581         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1582         vc->vc_need_wrap = 0;
1583 }
1584
1585 /* console_sem is held (except via vc_init->reset_terminal */
1586 static void save_cur(struct vc_data *vc)
1587 {
1588         vc->vc_saved_x          = vc->vc_x;
1589         vc->vc_saved_y          = vc->vc_y;
1590         vc->vc_s_intensity      = vc->vc_intensity;
1591         vc->vc_s_italic         = vc->vc_italic;
1592         vc->vc_s_underline      = vc->vc_underline;
1593         vc->vc_s_blink          = vc->vc_blink;
1594         vc->vc_s_reverse        = vc->vc_reverse;
1595         vc->vc_s_charset        = vc->vc_charset;
1596         vc->vc_s_color          = vc->vc_color;
1597         vc->vc_saved_G0         = vc->vc_G0_charset;
1598         vc->vc_saved_G1         = vc->vc_G1_charset;
1599 }
1600
1601 /* console_sem is held */
1602 static void restore_cur(struct vc_data *vc)
1603 {
1604         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1605         vc->vc_intensity        = vc->vc_s_intensity;
1606         vc->vc_italic           = vc->vc_s_italic;
1607         vc->vc_underline        = vc->vc_s_underline;
1608         vc->vc_blink            = vc->vc_s_blink;
1609         vc->vc_reverse          = vc->vc_s_reverse;
1610         vc->vc_charset          = vc->vc_s_charset;
1611         vc->vc_color            = vc->vc_s_color;
1612         vc->vc_G0_charset       = vc->vc_saved_G0;
1613         vc->vc_G1_charset       = vc->vc_saved_G1;
1614         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1615         update_attr(vc);
1616         vc->vc_need_wrap = 0;
1617 }
1618
1619 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1620         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1621         ESpalette };
1622
1623 /* console_sem is held (except via vc_init()) */
1624 static void reset_terminal(struct vc_data *vc, int do_clear)
1625 {
1626         vc->vc_top              = 0;
1627         vc->vc_bottom           = vc->vc_rows;
1628         vc->vc_state            = ESnormal;
1629         vc->vc_ques             = 0;
1630         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1631         vc->vc_G0_charset       = LAT1_MAP;
1632         vc->vc_G1_charset       = GRAF_MAP;
1633         vc->vc_charset          = 0;
1634         vc->vc_need_wrap        = 0;
1635         vc->vc_report_mouse     = 0;
1636         vc->vc_utf              = default_utf8;
1637         vc->vc_utf_count        = 0;
1638
1639         vc->vc_disp_ctrl        = 0;
1640         vc->vc_toggle_meta      = 0;
1641
1642         vc->vc_decscnm          = 0;
1643         vc->vc_decom            = 0;
1644         vc->vc_decawm           = 1;
1645         vc->vc_deccm            = global_cursor_default;
1646         vc->vc_decim            = 0;
1647
1648         set_kbd(vc, decarm);
1649         clr_kbd(vc, decckm);
1650         clr_kbd(vc, kbdapplic);
1651         clr_kbd(vc, lnm);
1652         kbd_table[vc->vc_num].lockstate = 0;
1653         kbd_table[vc->vc_num].slockstate = 0;
1654         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1655         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1656         /* do not do set_leds here because this causes an endless tasklet loop
1657            when the keyboard hasn't been initialized yet */
1658
1659         vc->vc_cursor_type = cur_default;
1660         vc->vc_complement_mask = vc->vc_s_complement_mask;
1661
1662         default_attr(vc);
1663         update_attr(vc);
1664
1665         vc->vc_tab_stop[0]      = 0x01010100;
1666         vc->vc_tab_stop[1]      =
1667         vc->vc_tab_stop[2]      =
1668         vc->vc_tab_stop[3]      =
1669         vc->vc_tab_stop[4]      =
1670         vc->vc_tab_stop[5]      =
1671         vc->vc_tab_stop[6]      =
1672         vc->vc_tab_stop[7]      = 0x01010101;
1673
1674         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1675         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1676
1677         gotoxy(vc, 0, 0);
1678         save_cur(vc);
1679         if (do_clear)
1680             csi_J(vc, 2);
1681 }
1682
1683 /* console_sem is held */
1684 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1685 {
1686         /*
1687          *  Control characters can be used in the _middle_
1688          *  of an escape sequence.
1689          */
1690         switch (c) {
1691         case 0:
1692                 return;
1693         case 7:
1694                 if (vc->vc_bell_duration)
1695                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1696                 return;
1697         case 8:
1698                 bs(vc);
1699                 return;
1700         case 9:
1701                 vc->vc_pos -= (vc->vc_x << 1);
1702                 while (vc->vc_x < vc->vc_cols - 1) {
1703                         vc->vc_x++;
1704                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1705                                 break;
1706                 }
1707                 vc->vc_pos += (vc->vc_x << 1);
1708                 notify_write(vc, '\t');
1709                 return;
1710         case 10: case 11: case 12:
1711                 lf(vc);
1712                 if (!is_kbd(vc, lnm))
1713                         return;
1714         case 13:
1715                 cr(vc);
1716                 return;
1717         case 14:
1718                 vc->vc_charset = 1;
1719                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1720                 vc->vc_disp_ctrl = 1;
1721                 return;
1722         case 15:
1723                 vc->vc_charset = 0;
1724                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1725                 vc->vc_disp_ctrl = 0;
1726                 return;
1727         case 24: case 26:
1728                 vc->vc_state = ESnormal;
1729                 return;
1730         case 27:
1731                 vc->vc_state = ESesc;
1732                 return;
1733         case 127:
1734                 del(vc);
1735                 return;
1736         case 128+27:
1737                 vc->vc_state = ESsquare;
1738                 return;
1739         }
1740         switch(vc->vc_state) {
1741         case ESesc:
1742                 vc->vc_state = ESnormal;
1743                 switch (c) {
1744                 case '[':
1745                         vc->vc_state = ESsquare;
1746                         return;
1747                 case ']':
1748                         vc->vc_state = ESnonstd;
1749                         return;
1750                 case '%':
1751                         vc->vc_state = ESpercent;
1752                         return;
1753                 case 'E':
1754                         cr(vc);
1755                         lf(vc);
1756                         return;
1757                 case 'M':
1758                         ri(vc);
1759                         return;
1760                 case 'D':
1761                         lf(vc);
1762                         return;
1763                 case 'H':
1764                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1765                         return;
1766                 case 'Z':
1767                         respond_ID(tty);
1768                         return;
1769                 case '7':
1770                         save_cur(vc);
1771                         return;
1772                 case '8':
1773                         restore_cur(vc);
1774                         return;
1775                 case '(':
1776                         vc->vc_state = ESsetG0;
1777                         return;
1778                 case ')':
1779                         vc->vc_state = ESsetG1;
1780                         return;
1781                 case '#':
1782                         vc->vc_state = EShash;
1783                         return;
1784                 case 'c':
1785                         reset_terminal(vc, 1);
1786                         return;
1787                 case '>':  /* Numeric keypad */
1788                         clr_kbd(vc, kbdapplic);
1789                         return;
1790                 case '=':  /* Appl. keypad */
1791                         set_kbd(vc, kbdapplic);
1792                         return;
1793                 }
1794                 return;
1795         case ESnonstd:
1796                 if (c=='P') {   /* palette escape sequence */
1797                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1798                                 vc->vc_par[vc->vc_npar] = 0;
1799                         vc->vc_npar = 0;
1800                         vc->vc_state = ESpalette;
1801                         return;
1802                 } else if (c=='R') {   /* reset palette */
1803                         reset_palette(vc);
1804                         vc->vc_state = ESnormal;
1805                 } else
1806                         vc->vc_state = ESnormal;
1807                 return;
1808         case ESpalette:
1809                 if (isxdigit(c)) {
1810                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1811                         if (vc->vc_npar == 7) {
1812                                 int i = vc->vc_par[0] * 3, j = 1;
1813                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1814                                 vc->vc_palette[i++] += vc->vc_par[j++];
1815                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1816                                 vc->vc_palette[i++] += vc->vc_par[j++];
1817                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1818                                 vc->vc_palette[i] += vc->vc_par[j];
1819                                 set_palette(vc);
1820                                 vc->vc_state = ESnormal;
1821                         }
1822                 } else
1823                         vc->vc_state = ESnormal;
1824                 return;
1825         case ESsquare:
1826                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1827                         vc->vc_par[vc->vc_npar] = 0;
1828                 vc->vc_npar = 0;
1829                 vc->vc_state = ESgetpars;
1830                 if (c == '[') { /* Function key */
1831                         vc->vc_state=ESfunckey;
1832                         return;
1833                 }
1834                 vc->vc_ques = (c == '?');
1835                 if (vc->vc_ques)
1836                         return;
1837         case ESgetpars:
1838                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1839                         vc->vc_npar++;
1840                         return;
1841                 } else if (c>='0' && c<='9') {
1842                         vc->vc_par[vc->vc_npar] *= 10;
1843                         vc->vc_par[vc->vc_npar] += c - '0';
1844                         return;
1845                 } else
1846                         vc->vc_state = ESgotpars;
1847         case ESgotpars:
1848                 vc->vc_state = ESnormal;
1849                 switch(c) {
1850                 case 'h':
1851                         set_mode(vc, 1);
1852                         return;
1853                 case 'l':
1854                         set_mode(vc, 0);
1855                         return;
1856                 case 'c':
1857                         if (vc->vc_ques) {
1858                                 if (vc->vc_par[0])
1859                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1860                                 else
1861                                         vc->vc_cursor_type = cur_default;
1862                                 return;
1863                         }
1864                         break;
1865                 case 'm':
1866                         if (vc->vc_ques) {
1867                                 clear_selection();
1868                                 if (vc->vc_par[0])
1869                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1870                                 else
1871                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1872                                 return;
1873                         }
1874                         break;
1875                 case 'n':
1876                         if (!vc->vc_ques) {
1877                                 if (vc->vc_par[0] == 5)
1878                                         status_report(tty);
1879                                 else if (vc->vc_par[0] == 6)
1880                                         cursor_report(vc, tty);
1881                         }
1882                         return;
1883                 }
1884                 if (vc->vc_ques) {
1885                         vc->vc_ques = 0;
1886                         return;
1887                 }
1888                 switch(c) {
1889                 case 'G': case '`':
1890                         if (vc->vc_par[0])
1891                                 vc->vc_par[0]--;
1892                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1893                         return;
1894                 case 'A':
1895                         if (!vc->vc_par[0])
1896                                 vc->vc_par[0]++;
1897                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1898                         return;
1899                 case 'B': case 'e':
1900                         if (!vc->vc_par[0])
1901                                 vc->vc_par[0]++;
1902                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1903                         return;
1904                 case 'C': case 'a':
1905                         if (!vc->vc_par[0])
1906                                 vc->vc_par[0]++;
1907                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1908                         return;
1909                 case 'D':
1910                         if (!vc->vc_par[0])
1911                                 vc->vc_par[0]++;
1912                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1913                         return;
1914                 case 'E':
1915                         if (!vc->vc_par[0])
1916                                 vc->vc_par[0]++;
1917                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1918                         return;
1919                 case 'F':
1920                         if (!vc->vc_par[0])
1921                                 vc->vc_par[0]++;
1922                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1923                         return;
1924                 case 'd':
1925                         if (vc->vc_par[0])
1926                                 vc->vc_par[0]--;
1927                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1928                         return;
1929                 case 'H': case 'f':
1930                         if (vc->vc_par[0])
1931                                 vc->vc_par[0]--;
1932                         if (vc->vc_par[1])
1933                                 vc->vc_par[1]--;
1934                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1935                         return;
1936                 case 'J':
1937                         csi_J(vc, vc->vc_par[0]);
1938                         return;
1939                 case 'K':
1940                         csi_K(vc, vc->vc_par[0]);
1941                         return;
1942                 case 'L':
1943                         csi_L(vc, vc->vc_par[0]);
1944                         return;
1945                 case 'M':
1946                         csi_M(vc, vc->vc_par[0]);
1947                         return;
1948                 case 'P':
1949                         csi_P(vc, vc->vc_par[0]);
1950                         return;
1951                 case 'c':
1952                         if (!vc->vc_par[0])
1953                                 respond_ID(tty);
1954                         return;
1955                 case 'g':
1956                         if (!vc->vc_par[0])
1957                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1958                         else if (vc->vc_par[0] == 3) {
1959                                 vc->vc_tab_stop[0] =
1960                                         vc->vc_tab_stop[1] =
1961                                         vc->vc_tab_stop[2] =
1962                                         vc->vc_tab_stop[3] =
1963                                         vc->vc_tab_stop[4] =
1964                                         vc->vc_tab_stop[5] =
1965                                         vc->vc_tab_stop[6] =
1966                                         vc->vc_tab_stop[7] = 0;
1967                         }
1968                         return;
1969                 case 'm':
1970                         csi_m(vc);
1971                         return;
1972                 case 'q': /* DECLL - but only 3 leds */
1973                         /* map 0,1,2,3 to 0,1,2,4 */
1974                         if (vc->vc_par[0] < 4)
1975                                 setledstate(kbd_table + vc->vc_num,
1976                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1977                         return;
1978                 case 'r':
1979                         if (!vc->vc_par[0])
1980                                 vc->vc_par[0]++;
1981                         if (!vc->vc_par[1])
1982                                 vc->vc_par[1] = vc->vc_rows;
1983                         /* Minimum allowed region is 2 lines */
1984                         if (vc->vc_par[0] < vc->vc_par[1] &&
1985                             vc->vc_par[1] <= vc->vc_rows) {
1986                                 vc->vc_top = vc->vc_par[0] - 1;
1987                                 vc->vc_bottom = vc->vc_par[1];
1988                                 gotoxay(vc, 0, 0);
1989                         }
1990                         return;
1991                 case 's':
1992                         save_cur(vc);
1993                         return;
1994                 case 'u':
1995                         restore_cur(vc);
1996                         return;
1997                 case 'X':
1998                         csi_X(vc, vc->vc_par[0]);
1999                         return;
2000                 case '@':
2001                         csi_at(vc, vc->vc_par[0]);
2002                         return;
2003                 case ']': /* setterm functions */
2004                         setterm_command(vc);
2005                         return;
2006                 }
2007                 return;
2008         case ESpercent:
2009                 vc->vc_state = ESnormal;
2010                 switch (c) {
2011                 case '@':  /* defined in ISO 2022 */
2012                         vc->vc_utf = 0;
2013                         return;
2014                 case 'G':  /* prelim official escape code */
2015                 case '8':  /* retained for compatibility */
2016                         vc->vc_utf = 1;
2017                         return;
2018                 }
2019                 return;
2020         case ESfunckey:
2021                 vc->vc_state = ESnormal;
2022                 return;
2023         case EShash:
2024                 vc->vc_state = ESnormal;
2025                 if (c == '8') {
2026                         /* DEC screen alignment test. kludge :-) */
2027                         vc->vc_video_erase_char =
2028                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2029                         csi_J(vc, 2);
2030                         vc->vc_video_erase_char =
2031                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2032                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2033                 }
2034                 return;
2035         case ESsetG0:
2036                 if (c == '0')
2037                         vc->vc_G0_charset = GRAF_MAP;
2038                 else if (c == 'B')
2039                         vc->vc_G0_charset = LAT1_MAP;
2040                 else if (c == 'U')
2041                         vc->vc_G0_charset = IBMPC_MAP;
2042                 else if (c == 'K')
2043                         vc->vc_G0_charset = USER_MAP;
2044                 if (vc->vc_charset == 0)
2045                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2046                 vc->vc_state = ESnormal;
2047                 return;
2048         case ESsetG1:
2049                 if (c == '0')
2050                         vc->vc_G1_charset = GRAF_MAP;
2051                 else if (c == 'B')
2052                         vc->vc_G1_charset = LAT1_MAP;
2053                 else if (c == 'U')
2054                         vc->vc_G1_charset = IBMPC_MAP;
2055                 else if (c == 'K')
2056                         vc->vc_G1_charset = USER_MAP;
2057                 if (vc->vc_charset == 1)
2058                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2059                 vc->vc_state = ESnormal;
2060                 return;
2061         default:
2062                 vc->vc_state = ESnormal;
2063         }
2064 }
2065
2066 /* This is a temporary buffer used to prepare a tty console write
2067  * so that we can easily avoid touching user space while holding the
2068  * console spinlock.  It is allocated in con_init and is shared by
2069  * this code and the vc_screen read/write tty calls.
2070  *
2071  * We have to allocate this statically in the kernel data section
2072  * since console_init (and thus con_init) are called before any
2073  * kernel memory allocation is available.
2074  */
2075 char con_buf[CON_BUF_SIZE];
2076 DEFINE_MUTEX(con_buf_mtx);
2077
2078 /* is_double_width() is based on the wcwidth() implementation by
2079  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2080  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2081  */
2082 struct interval {
2083         uint32_t first;
2084         uint32_t last;
2085 };
2086
2087 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2088 {
2089         int min = 0;
2090         int mid;
2091
2092         if (ucs < table[0].first || ucs > table[max].last)
2093                 return 0;
2094         while (max >= min) {
2095                 mid = (min + max) / 2;
2096                 if (ucs > table[mid].last)
2097                         min = mid + 1;
2098                 else if (ucs < table[mid].first)
2099                         max = mid - 1;
2100                 else
2101                         return 1;
2102         }
2103         return 0;
2104 }
2105
2106 static int is_double_width(uint32_t ucs)
2107 {
2108         static const struct interval double_width[] = {
2109                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2110                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2111                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2112                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2113         };
2114         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2115 }
2116
2117 /* acquires console_sem */
2118 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2119 {
2120 #ifdef VT_BUF_VRAM_ONLY
2121 #define FLUSH do { } while(0);
2122 #else
2123 #define FLUSH if (draw_x >= 0) { \
2124         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2125         draw_x = -1; \
2126         }
2127 #endif
2128
2129         int c, tc, ok, n = 0, draw_x = -1;
2130         unsigned int currcons;
2131         unsigned long draw_from = 0, draw_to = 0;
2132         struct vc_data *vc;
2133         unsigned char vc_attr;
2134         struct vt_notifier_param param;
2135         uint8_t rescan;
2136         uint8_t inverse;
2137         uint8_t width;
2138         u16 himask, charmask;
2139
2140         if (in_interrupt())
2141                 return count;
2142
2143         might_sleep();
2144
2145         acquire_console_sem();
2146         vc = tty->driver_data;
2147         if (vc == NULL) {
2148                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2149                 release_console_sem();
2150                 return 0;
2151         }
2152
2153         currcons = vc->vc_num;
2154         if (!vc_cons_allocated(currcons)) {
2155             /* could this happen? */
2156                 printk_once("con_write: tty %d not allocated\n", currcons+1);
2157             release_console_sem();
2158             return 0;
2159         }
2160
2161         himask = vc->vc_hi_font_mask;
2162         charmask = himask ? 0x1ff : 0xff;
2163
2164         /* undraw cursor first */
2165         if (IS_FG(vc))
2166                 hide_cursor(vc);
2167
2168         param.vc = vc;
2169
2170         while (!tty->stopped && count) {
2171                 int orig = *buf;
2172                 c = orig;
2173                 buf++;
2174                 n++;
2175                 count--;
2176                 rescan = 0;
2177                 inverse = 0;
2178                 width = 1;
2179
2180                 /* Do no translation at all in control states */
2181                 if (vc->vc_state != ESnormal) {
2182                         tc = c;
2183                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2184                     /* Combine UTF-8 into Unicode in vc_utf_char.
2185                      * vc_utf_count is the number of continuation bytes still
2186                      * expected to arrive.
2187                      * vc_npar is the number of continuation bytes arrived so
2188                      * far
2189                      */
2190 rescan_last_byte:
2191                     if ((c & 0xc0) == 0x80) {
2192                         /* Continuation byte received */
2193                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2194                         if (vc->vc_utf_count) {
2195                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2196                             vc->vc_npar++;
2197                             if (--vc->vc_utf_count) {
2198                                 /* Still need some bytes */
2199                                 continue;
2200                             }
2201                             /* Got a whole character */
2202                             c = vc->vc_utf_char;
2203                             /* Reject overlong sequences */
2204                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2205                                         c > utf8_length_changes[vc->vc_npar])
2206                                 c = 0xfffd;
2207                         } else {
2208                             /* Unexpected continuation byte */
2209                             vc->vc_utf_count = 0;
2210                             c = 0xfffd;
2211                         }
2212                     } else {
2213                         /* Single ASCII byte or first byte of a sequence received */
2214                         if (vc->vc_utf_count) {
2215                             /* Continuation byte expected */
2216                             rescan = 1;
2217                             vc->vc_utf_count = 0;
2218                             c = 0xfffd;
2219                         } else if (c > 0x7f) {
2220                             /* First byte of a multibyte sequence received */
2221                             vc->vc_npar = 0;
2222                             if ((c & 0xe0) == 0xc0) {
2223                                 vc->vc_utf_count = 1;
2224                                 vc->vc_utf_char = (c & 0x1f);
2225                             } else if ((c & 0xf0) == 0xe0) {
2226                                 vc->vc_utf_count = 2;
2227                                 vc->vc_utf_char = (c & 0x0f);
2228                             } else if ((c & 0xf8) == 0xf0) {
2229                                 vc->vc_utf_count = 3;
2230                                 vc->vc_utf_char = (c & 0x07);
2231                             } else if ((c & 0xfc) == 0xf8) {
2232                                 vc->vc_utf_count = 4;
2233                                 vc->vc_utf_char = (c & 0x03);
2234                             } else if ((c & 0xfe) == 0xfc) {
2235                                 vc->vc_utf_count = 5;
2236                                 vc->vc_utf_char = (c & 0x01);
2237                             } else {
2238                                 /* 254 and 255 are invalid */
2239                                 c = 0xfffd;
2240                             }
2241                             if (vc->vc_utf_count) {
2242                                 /* Still need some bytes */
2243                                 continue;
2244                             }
2245                         }
2246                         /* Nothing to do if an ASCII byte was received */
2247                     }
2248                     /* End of UTF-8 decoding. */
2249                     /* c is the received character, or U+FFFD for invalid sequences. */
2250                     /* Replace invalid Unicode code points with U+FFFD too */
2251                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2252                         c = 0xfffd;
2253                     tc = c;
2254                 } else {        /* no utf or alternate charset mode */
2255                     tc = vc_translate(vc, c);
2256                 }
2257
2258                 param.c = tc;
2259                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2260                                         &param) == NOTIFY_STOP)
2261                         continue;
2262
2263                 /* If the original code was a control character we
2264                  * only allow a glyph to be displayed if the code is
2265                  * not normally used (such as for cursor movement) or
2266                  * if the disp_ctrl mode has been explicitly enabled.
2267                  * Certain characters (as given by the CTRL_ALWAYS
2268                  * bitmap) are always displayed as control characters,
2269                  * as the console would be pretty useless without
2270                  * them; to display an arbitrary font position use the
2271                  * direct-to-font zone in UTF-8 mode.
2272                  */
2273                 ok = tc && (c >= 32 ||
2274                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2275                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2276                         && (c != 127 || vc->vc_disp_ctrl)
2277                         && (c != 128+27);
2278
2279                 if (vc->vc_state == ESnormal && ok) {
2280                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2281                                 if (is_double_width(c))
2282                                         width = 2;
2283                         }
2284                         /* Now try to find out how to display it */
2285                         tc = conv_uni_to_pc(vc, tc);
2286                         if (tc & ~charmask) {
2287                                 if (tc == -1 || tc == -2) {
2288                                     continue; /* nothing to display */
2289                                 }
2290                                 /* Glyph not found */
2291                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2292                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2293                                        This would make absolutely no sense with Unicode in mind,
2294                                        but do this for ASCII characters since a font may lack
2295                                        Unicode mapping info and we don't want to end up with
2296                                        having question marks only. */
2297                                     tc = c;
2298                                 } else {
2299                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2300                                     tc = conv_uni_to_pc(vc, 0xfffd);
2301                                     if (tc < 0) {
2302                                         inverse = 1;
2303                                         tc = conv_uni_to_pc(vc, '?');
2304                                         if (tc < 0) tc = '?';
2305                                     }
2306                                 }
2307                         }
2308
2309                         if (!inverse) {
2310                                 vc_attr = vc->vc_attr;
2311                         } else {
2312                                 /* invert vc_attr */
2313                                 if (!vc->vc_can_do_color) {
2314                                         vc_attr = (vc->vc_attr) ^ 0x08;
2315                                 } else if (vc->vc_hi_font_mask == 0x100) {
2316                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2317                                 } else {
2318                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2319                                 }
2320                                 FLUSH
2321                         }
2322
2323                         while (1) {
2324                                 if (vc->vc_need_wrap || vc->vc_decim)
2325                                         FLUSH
2326                                 if (vc->vc_need_wrap) {
2327                                         cr(vc);
2328                                         lf(vc);
2329                                 }
2330                                 if (vc->vc_decim)
2331                                         insert_char(vc, 1);
2332                                 scr_writew(himask ?
2333                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2334                                              (vc_attr << 8) + tc,
2335                                            (u16 *) vc->vc_pos);
2336                                 if (DO_UPDATE(vc) && draw_x < 0) {
2337                                         draw_x = vc->vc_x;
2338                                         draw_from = vc->vc_pos;
2339                                 }
2340                                 if (vc->vc_x == vc->vc_cols - 1) {
2341                                         vc->vc_need_wrap = vc->vc_decawm;
2342                                         draw_to = vc->vc_pos + 2;
2343                                 } else {
2344                                         vc->vc_x++;
2345                                         draw_to = (vc->vc_pos += 2);
2346                                 }
2347
2348                                 if (!--width) break;
2349
2350                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2351                                 if (tc < 0) tc = ' ';
2352                         }
2353                         notify_write(vc, c);
2354
2355                         if (inverse) {
2356                                 FLUSH
2357                         }
2358
2359                         if (rescan) {
2360                                 rescan = 0;
2361                                 inverse = 0;
2362                                 width = 1;
2363                                 c = orig;
2364                                 goto rescan_last_byte;
2365                         }
2366                         continue;
2367                 }
2368                 FLUSH
2369                 do_con_trol(tty, vc, orig);
2370         }
2371         FLUSH
2372         console_conditional_schedule();
2373         release_console_sem();
2374         notify_update(vc);
2375         return n;
2376 #undef FLUSH
2377 }
2378
2379 /*
2380  * This is the console switching callback.
2381  *
2382  * Doing console switching in a process context allows
2383  * us to do the switches asynchronously (needed when we want
2384  * to switch due to a keyboard interrupt).  Synchronization
2385  * with other console code and prevention of re-entrancy is
2386  * ensured with console_sem.
2387  */
2388 static void console_callback(struct work_struct *ignored)
2389 {
2390         acquire_console_sem();
2391
2392         if (want_console >= 0) {
2393                 if (want_console != fg_console &&
2394                     vc_cons_allocated(want_console)) {
2395                         hide_cursor(vc_cons[fg_console].d);
2396                         change_console(vc_cons[want_console].d);
2397                         /* we only changed when the console had already
2398                            been allocated - a new console is not created
2399                            in an interrupt routine */
2400                 }
2401                 want_console = -1;
2402         }
2403         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2404                 do_poke_blanked_console = 0;
2405                 poke_blanked_console();
2406         }
2407         if (scrollback_delta) {
2408                 struct vc_data *vc = vc_cons[fg_console].d;
2409                 clear_selection();
2410                 if (vc->vc_mode == KD_TEXT)
2411                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2412                 scrollback_delta = 0;
2413         }
2414         if (blank_timer_expired) {
2415                 do_blank_screen(0);
2416                 blank_timer_expired = 0;
2417         }
2418         notify_update(vc_cons[fg_console].d);
2419
2420         release_console_sem();
2421 }
2422
2423 int set_console(int nr)
2424 {
2425         struct vc_data *vc = vc_cons[fg_console].d;
2426
2427         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2428                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2429
2430                 /*
2431                  * Console switch will fail in console_callback() or
2432                  * change_console() so there is no point scheduling
2433                  * the callback
2434                  *
2435                  * Existing set_console() users don't check the return
2436                  * value so this shouldn't break anything
2437                  */
2438                 return -EINVAL;
2439         }
2440
2441         want_console = nr;
2442         schedule_console_callback();
2443
2444         return 0;
2445 }
2446
2447 struct tty_driver *console_driver;
2448
2449 #ifdef CONFIG_VT_CONSOLE
2450
2451 /**
2452  * vt_kmsg_redirect() - Sets/gets the kernel message console
2453  * @new:        The new virtual terminal number or -1 if the console should stay
2454  *              unchanged
2455  *
2456  * By default, the kernel messages are always printed on the current virtual
2457  * console. However, the user may modify that default with the
2458  * TIOCL_SETKMSGREDIRECT ioctl call.
2459  *
2460  * This function sets the kernel message console to be @new. It returns the old
2461  * virtual console number. The virtual terminal number 0 (both as parameter and
2462  * return value) means no redirection (i.e. always printed on the currently
2463  * active console).
2464  *
2465  * The parameter -1 means that only the current console is returned, but the
2466  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2467  * case to make the code more understandable.
2468  *
2469  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2470  * the parameter and always returns 0.
2471  */
2472 int vt_kmsg_redirect(int new)
2473 {
2474         static int kmsg_con;
2475
2476         if (new != -1)
2477                 return xchg(&kmsg_con, new);
2478         else
2479                 return kmsg_con;
2480 }
2481
2482 /*
2483  *      Console on virtual terminal
2484  *
2485  * The console must be locked when we get here.
2486  */
2487
2488 static void vt_console_print(struct console *co, const char *b, unsigned count)
2489 {
2490         struct vc_data *vc = vc_cons[fg_console].d;
2491         unsigned char c;
2492         static DEFINE_SPINLOCK(printing_lock);
2493         const ushort *start;
2494         ushort cnt = 0;
2495         ushort myx;
2496         int kmsg_console;
2497
2498         /* console busy or not yet initialized */
2499         if (!printable)
2500                 return;
2501         if (!spin_trylock(&printing_lock))
2502                 return;
2503
2504         kmsg_console = vt_get_kmsg_redirect();
2505         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2506                 vc = vc_cons[kmsg_console - 1].d;
2507
2508         /* read `x' only after setting currcons properly (otherwise
2509            the `x' macro will read the x of the foreground console). */
2510         myx = vc->vc_x;
2511
2512         if (!vc_cons_allocated(fg_console)) {
2513                 /* impossible */
2514                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2515                 goto quit;
2516         }
2517
2518         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2519                 goto quit;
2520
2521         /* undraw cursor first */
2522         if (IS_FG(vc))
2523                 hide_cursor(vc);
2524
2525         start = (ushort *)vc->vc_pos;
2526
2527         /* Contrived structure to try to emulate original need_wrap behaviour
2528          * Problems caused when we have need_wrap set on '\n' character */
2529         while (count--) {
2530                 c = *b++;
2531                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2532                         if (cnt > 0) {
2533                                 if (CON_IS_VISIBLE(vc))
2534                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2535                                 vc->vc_x += cnt;
2536                                 if (vc->vc_need_wrap)
2537                                         vc->vc_x--;
2538                                 cnt = 0;
2539                         }
2540                         if (c == 8) {           /* backspace */
2541                                 bs(vc);
2542                                 start = (ushort *)vc->vc_pos;
2543                                 myx = vc->vc_x;
2544                                 continue;
2545                         }
2546                         if (c != 13)
2547                                 lf(vc);
2548                         cr(vc);
2549                         start = (ushort *)vc->vc_pos;
2550                         myx = vc->vc_x;
2551                         if (c == 10 || c == 13)
2552                                 continue;
2553                 }
2554                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2555                 notify_write(vc, c);
2556                 cnt++;
2557                 if (myx == vc->vc_cols - 1) {
2558                         vc->vc_need_wrap = 1;
2559                         continue;
2560                 }
2561                 vc->vc_pos += 2;
2562                 myx++;
2563         }
2564         if (cnt > 0) {
2565                 if (CON_IS_VISIBLE(vc))
2566                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2567                 vc->vc_x += cnt;
2568                 if (vc->vc_x == vc->vc_cols) {
2569                         vc->vc_x--;
2570                         vc->vc_need_wrap = 1;
2571                 }
2572         }
2573         set_cursor(vc);
2574         notify_update(vc);
2575
2576 quit:
2577         spin_unlock(&printing_lock);
2578 }
2579
2580 static struct tty_driver *vt_console_device(struct console *c, int *index)
2581 {
2582         *index = c->index ? c->index-1 : fg_console;
2583         return console_driver;
2584 }
2585
2586 static struct console vt_console_driver = {
2587         .name           = "tty",
2588         .write          = vt_console_print,
2589         .device         = vt_console_device,
2590         .unblank        = unblank_screen,
2591         .flags          = CON_PRINTBUFFER,
2592         .index          = -1,
2593 };
2594 #endif
2595
2596 /*
2597  *      Handling of Linux-specific VC ioctls
2598  */
2599
2600 /*
2601  * Generally a bit racy with respect to console_sem().
2602  *
2603  * There are some functions which don't need it.
2604  *
2605  * There are some functions which can sleep for arbitrary periods
2606  * (paste_selection) but we don't need the lock there anyway.
2607  *
2608  * set_selection has locking, and definitely needs it
2609  */
2610
2611 int tioclinux(struct tty_struct *tty, unsigned long arg)
2612 {
2613         char type, data;
2614         char __user *p = (char __user *)arg;
2615         int lines;
2616         int ret;
2617
2618         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2619                 return -EPERM;
2620         if (get_user(type, p))
2621                 return -EFAULT;
2622         ret = 0;
2623
2624         switch (type)
2625         {
2626                 case TIOCL_SETSEL:
2627                         acquire_console_sem();
2628                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2629                         release_console_sem();
2630                         break;
2631                 case TIOCL_PASTESEL:
2632                         ret = paste_selection(tty);
2633                         break;
2634                 case TIOCL_UNBLANKSCREEN:
2635                         acquire_console_sem();
2636                         unblank_screen();
2637                         release_console_sem();
2638                         break;
2639                 case TIOCL_SELLOADLUT:
2640                         ret = sel_loadlut(p);
2641                         break;
2642                 case TIOCL_GETSHIFTSTATE:
2643
2644         /*
2645          * Make it possible to react to Shift+Mousebutton.
2646          * Note that 'shift_state' is an undocumented
2647          * kernel-internal variable; programs not closely
2648          * related to the kernel should not use this.
2649          */
2650                         data = shift_state;
2651                         ret = __put_user(data, p);
2652                         break;
2653                 case TIOCL_GETMOUSEREPORTING:
2654                         data = mouse_reporting();
2655                         ret = __put_user(data, p);
2656                         break;
2657                 case TIOCL_SETVESABLANK:
2658                         ret = set_vesa_blanking(p);
2659                         break;
2660                 case TIOCL_GETKMSGREDIRECT:
2661                         data = vt_get_kmsg_redirect();
2662                         ret = __put_user(data, p);
2663                         break;
2664                 case TIOCL_SETKMSGREDIRECT:
2665                         if (!capable(CAP_SYS_ADMIN)) {
2666                                 ret = -EPERM;
2667                         } else {
2668                                 if (get_user(data, p+1))
2669                                         ret = -EFAULT;
2670                                 else
2671                                         vt_kmsg_redirect(data);
2672                         }
2673                         break;
2674                 case TIOCL_GETFGCONSOLE:
2675                         ret = fg_console;
2676                         break;
2677                 case TIOCL_SCROLLCONSOLE:
2678                         if (get_user(lines, (s32 __user *)(p+4))) {
2679                                 ret = -EFAULT;
2680                         } else {
2681                                 scrollfront(vc_cons[fg_console].d, lines);
2682                                 ret = 0;
2683                         }
2684                         break;
2685                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2686                         acquire_console_sem();
2687                         ignore_poke = 1;
2688                         do_blank_screen(0);
2689                         release_console_sem();
2690                         break;
2691                 case TIOCL_BLANKEDSCREEN:
2692                         ret = console_blanked;
2693                         break;
2694                 default:
2695                         ret = -EINVAL;
2696                         break;
2697         }
2698         return ret;
2699 }
2700
2701 /*
2702  * /dev/ttyN handling
2703  */
2704
2705 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2706 {
2707         int     retval;
2708
2709         retval = do_con_write(tty, buf, count);
2710         con_flush_chars(tty);
2711
2712         return retval;
2713 }
2714
2715 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2716 {
2717         if (in_interrupt())
2718                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2719         return do_con_write(tty, &ch, 1);
2720 }
2721
2722 static int con_write_room(struct tty_struct *tty)
2723 {
2724         if (tty->stopped)
2725                 return 0;
2726         return 32768;           /* No limit, really; we're not buffering */
2727 }
2728
2729 static int con_chars_in_buffer(struct tty_struct *tty)
2730 {
2731         return 0;               /* we're not buffering */
2732 }
2733
2734 /*
2735  * con_throttle and con_unthrottle are only used for
2736  * paste_selection(), which has to stuff in a large number of
2737  * characters...
2738  */
2739 static void con_throttle(struct tty_struct *tty)
2740 {
2741 }
2742
2743 static void con_unthrottle(struct tty_struct *tty)
2744 {
2745         struct vc_data *vc = tty->driver_data;
2746
2747         wake_up_interruptible(&vc->paste_wait);
2748 }
2749
2750 /*
2751  * Turn the Scroll-Lock LED on when the tty is stopped
2752  */
2753 static void con_stop(struct tty_struct *tty)
2754 {
2755         int console_num;
2756         if (!tty)
2757                 return;
2758         console_num = tty->index;
2759         if (!vc_cons_allocated(console_num))
2760                 return;
2761         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2762         set_leds();
2763 }
2764
2765 /*
2766  * Turn the Scroll-Lock LED off when the console is started
2767  */
2768 static void con_start(struct tty_struct *tty)
2769 {
2770         int console_num;
2771         if (!tty)
2772                 return;
2773         console_num = tty->index;
2774         if (!vc_cons_allocated(console_num))
2775                 return;
2776         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2777         set_leds();
2778 }
2779
2780 static void con_flush_chars(struct tty_struct *tty)
2781 {
2782         struct vc_data *vc;
2783
2784         if (in_interrupt())     /* from flush_to_ldisc */
2785                 return;
2786
2787         /* if we race with con_close(), vt may be null */
2788         acquire_console_sem();
2789         vc = tty->driver_data;
2790         if (vc)
2791                 set_cursor(vc);
2792         release_console_sem();
2793 }
2794
2795 /*
2796  * Allocate the console screen memory.
2797  */
2798 static int con_open(struct tty_struct *tty, struct file *filp)
2799 {
2800         unsigned int currcons = tty->index;
2801         int ret = 0;
2802
2803         acquire_console_sem();
2804         if (tty->driver_data == NULL) {
2805                 ret = vc_allocate(currcons);
2806                 if (ret == 0) {
2807                         struct vc_data *vc = vc_cons[currcons].d;
2808
2809                         /* Still being freed */
2810                         if (vc->port.tty) {
2811                                 release_console_sem();
2812                                 return -ERESTARTSYS;
2813                         }
2814                         tty->driver_data = vc;
2815                         vc->port.tty = tty;
2816
2817                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2818                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2819                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2820                         }
2821                         if (vc->vc_utf)
2822                                 tty->termios->c_iflag |= IUTF8;
2823                         else
2824                                 tty->termios->c_iflag &= ~IUTF8;
2825                         release_console_sem();
2826                         return ret;
2827                 }
2828         }
2829         release_console_sem();
2830         return ret;
2831 }
2832
2833 static void con_close(struct tty_struct *tty, struct file *filp)
2834 {
2835         /* Nothing to do - we defer to shutdown */
2836 }
2837
2838 static void con_shutdown(struct tty_struct *tty)
2839 {
2840         struct vc_data *vc = tty->driver_data;
2841         BUG_ON(vc == NULL);
2842         acquire_console_sem();
2843         vc->port.tty = NULL;
2844         release_console_sem();
2845         tty_shutdown(tty);
2846 }
2847
2848 static int default_italic_color    = 2; // green (ASCII)
2849 static int default_underline_color = 3; // cyan (ASCII)
2850 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2851 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2852
2853 static void vc_init(struct vc_data *vc, unsigned int rows,
2854                     unsigned int cols, int do_clear)
2855 {
2856         int j, k ;
2857
2858         vc->vc_cols = cols;
2859         vc->vc_rows = rows;
2860         vc->vc_size_row = cols << 1;
2861         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2862
2863         set_origin(vc);
2864         vc->vc_pos = vc->vc_origin;
2865         reset_vc(vc);
2866         for (j=k=0; j<16; j++) {
2867                 vc->vc_palette[k++] = default_red[j] ;
2868                 vc->vc_palette[k++] = default_grn[j] ;
2869                 vc->vc_palette[k++] = default_blu[j] ;
2870         }
2871         vc->vc_def_color       = 0x07;   /* white */
2872         vc->vc_ulcolor         = default_underline_color;
2873         vc->vc_itcolor         = default_italic_color;
2874         vc->vc_halfcolor       = 0x08;   /* grey */
2875         init_waitqueue_head(&vc->paste_wait);
2876         reset_terminal(vc, do_clear);
2877 }
2878
2879 /*
2880  * This routine initializes console interrupts, and does nothing
2881  * else. If you want the screen to clear, call tty_write with
2882  * the appropriate escape-sequence.
2883  */
2884
2885 static int __init con_init(void)
2886 {
2887         const char *display_desc = NULL;
2888         struct vc_data *vc;
2889         unsigned int currcons = 0, i;
2890
2891         acquire_console_sem();
2892
2893         if (conswitchp)
2894                 display_desc = conswitchp->con_startup();
2895         if (!display_desc) {
2896                 fg_console = 0;
2897                 release_console_sem();
2898                 return 0;
2899         }
2900
2901         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2902                 struct con_driver *con_driver = &registered_con_driver[i];
2903
2904                 if (con_driver->con == NULL) {
2905                         con_driver->con = conswitchp;
2906                         con_driver->desc = display_desc;
2907                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2908                         con_driver->first = 0;
2909                         con_driver->last = MAX_NR_CONSOLES - 1;
2910                         break;
2911                 }
2912         }
2913
2914         for (i = 0; i < MAX_NR_CONSOLES; i++)
2915                 con_driver_map[i] = conswitchp;
2916
2917         if (blankinterval) {
2918                 blank_state = blank_normal_wait;
2919                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2920         }
2921
2922         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2923                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2924                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2925                 tty_port_init(&vc->port);
2926                 visual_init(vc, currcons, 1);
2927                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2928                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2929                         currcons || !vc->vc_sw->con_save_screen);
2930         }
2931         currcons = fg_console = 0;
2932         master_display_fg = vc = vc_cons[currcons].d;
2933         set_origin(vc);
2934         save_screen(vc);
2935         gotoxy(vc, vc->vc_x, vc->vc_y);
2936         csi_J(vc, 0);
2937         update_screen(vc);
2938         printk("Console: %s %s %dx%d",
2939                 vc->vc_can_do_color ? "colour" : "mono",
2940                 display_desc, vc->vc_cols, vc->vc_rows);
2941         printable = 1;
2942         printk("\n");
2943
2944         release_console_sem();
2945
2946 #ifdef CONFIG_VT_CONSOLE
2947         register_console(&vt_console_driver);
2948 #endif
2949         return 0;
2950 }
2951 console_initcall(con_init);
2952
2953 static const struct tty_operations con_ops = {
2954         .open = con_open,
2955         .close = con_close,
2956         .write = con_write,
2957         .write_room = con_write_room,
2958         .put_char = con_put_char,
2959         .flush_chars = con_flush_chars,
2960         .chars_in_buffer = con_chars_in_buffer,
2961         .ioctl = vt_ioctl,
2962 #ifdef CONFIG_COMPAT
2963         .compat_ioctl = vt_compat_ioctl,
2964 #endif
2965         .stop = con_stop,
2966         .start = con_start,
2967         .throttle = con_throttle,
2968         .unthrottle = con_unthrottle,
2969         .resize = vt_resize,
2970         .shutdown = con_shutdown
2971 };
2972
2973 static struct cdev vc0_cdev;
2974
2975 int __init vty_init(const struct file_operations *console_fops)
2976 {
2977         cdev_init(&vc0_cdev, console_fops);
2978         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2979             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2980                 panic("Couldn't register /dev/tty0 driver\n");
2981         device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2982
2983         vcs_init();
2984
2985         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2986         if (!console_driver)
2987                 panic("Couldn't allocate console driver\n");
2988         console_driver->owner = THIS_MODULE;
2989         console_driver->name = "tty";
2990         console_driver->name_base = 1;
2991         console_driver->major = TTY_MAJOR;
2992         console_driver->minor_start = 1;
2993         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2994         console_driver->init_termios = tty_std_termios;
2995         if (default_utf8)
2996                 console_driver->init_termios.c_iflag |= IUTF8;
2997         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2998         tty_set_operations(console_driver, &con_ops);
2999         if (tty_register_driver(console_driver))
3000                 panic("Couldn't register console driver\n");
3001         kbd_init();
3002         console_map_init();
3003 #ifdef CONFIG_MDA_CONSOLE
3004         mda_console_init();
3005 #endif
3006         return 0;
3007 }
3008
3009 #ifndef VT_SINGLE_DRIVER
3010
3011 static struct class *vtconsole_class;
3012
3013 static int bind_con_driver(const struct consw *csw, int first, int last,
3014                            int deflt)
3015 {
3016         struct module *owner = csw->owner;
3017         const char *desc = NULL;
3018         struct con_driver *con_driver;
3019         int i, j = -1, k = -1, retval = -ENODEV;
3020
3021         if (!try_module_get(owner))
3022                 return -ENODEV;
3023
3024         acquire_console_sem();
3025
3026         /* check if driver is registered */
3027         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3028                 con_driver = &registered_con_driver[i];
3029
3030                 if (con_driver->con == csw) {
3031                         desc = con_driver->desc;
3032                         retval = 0;
3033                         break;
3034                 }
3035         }
3036
3037         if (retval)
3038                 goto err;
3039
3040         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3041                 csw->con_startup();
3042                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3043         }
3044
3045         if (deflt) {
3046                 if (conswitchp)
3047                         module_put(conswitchp->owner);
3048
3049                 __module_get(owner);
3050                 conswitchp = csw;
3051         }
3052
3053         first = max(first, con_driver->first);
3054         last = min(last, con_driver->last);
3055
3056         for (i = first; i <= last; i++) {
3057                 int old_was_color;
3058                 struct vc_data *vc = vc_cons[i].d;
3059
3060                 if (con_driver_map[i])
3061                         module_put(con_driver_map[i]->owner);
3062                 __module_get(owner);
3063                 con_driver_map[i] = csw;
3064
3065                 if (!vc || !vc->vc_sw)
3066                         continue;
3067
3068                 j = i;
3069
3070                 if (CON_IS_VISIBLE(vc)) {
3071                         k = i;
3072                         save_screen(vc);
3073                 }
3074
3075                 old_was_color = vc->vc_can_do_color;
3076                 vc->vc_sw->con_deinit(vc);
3077                 if (!vc->vc_origin)
3078                         vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3079                 visual_init(vc, i, 0);
3080                 set_origin(vc);
3081                 update_attr(vc);
3082
3083                 /* If the console changed between mono <-> color, then
3084                  * the attributes in the screenbuf will be wrong.  The
3085                  * following resets all attributes to something sane.
3086                  */
3087                 if (old_was_color != vc->vc_can_do_color)
3088                         clear_buffer_attributes(vc);
3089         }
3090
3091         printk("Console: switching ");
3092         if (!deflt)
3093                 printk("consoles %d-%d ", first+1, last+1);
3094         if (j >= 0) {
3095                 struct vc_data *vc = vc_cons[j].d;
3096
3097                 printk("to %s %s %dx%d\n",
3098                        vc->vc_can_do_color ? "colour" : "mono",
3099                        desc, vc->vc_cols, vc->vc_rows);
3100
3101                 if (k >= 0) {
3102                         vc = vc_cons[k].d;
3103                         update_screen(vc);
3104                 }
3105         } else
3106                 printk("to %s\n", desc);
3107
3108         retval = 0;
3109 err:
3110         release_console_sem();
3111         module_put(owner);
3112         return retval;
3113 };
3114
3115 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3116 static int con_is_graphics(const struct consw *csw, int first, int last)
3117 {
3118         int i, retval = 0;
3119
3120         for (i = first; i <= last; i++) {
3121                 struct vc_data *vc = vc_cons[i].d;
3122
3123                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3124                         retval = 1;
3125                         break;
3126                 }
3127         }
3128
3129         return retval;
3130 }
3131
3132 /**
3133  * unbind_con_driver - unbind a console driver
3134  * @csw: pointer to console driver to unregister
3135  * @first: first in range of consoles that @csw should be unbound from
3136  * @last: last in range of consoles that @csw should be unbound from
3137  * @deflt: should next bound console driver be default after @csw is unbound?
3138  *
3139  * To unbind a driver from all possible consoles, pass 0 as @first and
3140  * %MAX_NR_CONSOLES as @last.
3141  *
3142  * @deflt controls whether the console that ends up replacing @csw should be
3143  * the default console.
3144  *
3145  * RETURNS:
3146  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3147  * or 0 on success.
3148  */
3149 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3150 {
3151         struct module *owner = csw->owner;
3152         const struct consw *defcsw = NULL;
3153         struct con_driver *con_driver = NULL, *con_back = NULL;
3154         int i, retval = -ENODEV;
3155
3156         if (!try_module_get(owner))
3157                 return -ENODEV;
3158
3159         acquire_console_sem();
3160
3161         /* check if driver is registered and if it is unbindable */
3162         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3163                 con_driver = &registered_con_driver[i];
3164
3165                 if (con_driver->con == csw &&
3166                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3167                         retval = 0;
3168                         break;
3169                 }
3170         }
3171
3172         if (retval) {
3173                 release_console_sem();
3174                 goto err;
3175         }
3176
3177         retval = -ENODEV;
3178
3179         /* check if backup driver exists */
3180         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3181                 con_back = &registered_con_driver[i];
3182
3183                 if (con_back->con &&
3184                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3185                         defcsw = con_back->con;
3186                         retval = 0;
3187                         break;
3188                 }
3189         }
3190
3191         if (retval) {
3192                 release_console_sem();
3193                 goto err;
3194         }
3195
3196         if (!con_is_bound(csw)) {
3197                 release_console_sem();
3198                 goto err;
3199         }
3200
3201         first = max(first, con_driver->first);
3202         last = min(last, con_driver->last);
3203
3204         for (i = first; i <= last; i++) {
3205                 if (con_driver_map[i] == csw) {
3206                         module_put(csw->owner);
3207                         con_driver_map[i] = NULL;
3208                 }
3209         }
3210
3211         if (!con_is_bound(defcsw)) {
3212                 const struct consw *defconsw = conswitchp;
3213
3214                 defcsw->con_startup();
3215                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3216                 /*
3217                  * vgacon may change the default driver to point
3218                  * to dummycon, we restore it here...
3219                  */
3220                 conswitchp = defconsw;
3221         }
3222
3223         if (!con_is_bound(csw))
3224                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3225
3226         release_console_sem();
3227         /* ignore return value, binding should not fail */
3228         bind_con_driver(defcsw, first, last, deflt);
3229 err:
3230         module_put(owner);
3231         return retval;
3232
3233 }
3234 EXPORT_SYMBOL(unbind_con_driver);
3235
3236 static int vt_bind(struct con_driver *con)
3237 {
3238         const struct consw *defcsw = NULL, *csw = NULL;
3239         int i, more = 1, first = -1, last = -1, deflt = 0;
3240
3241         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3242             con_is_graphics(con->con, con->first, con->last))
3243                 goto err;
3244
3245         csw = con->con;
3246
3247         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3248                 struct con_driver *con = &registered_con_driver[i];
3249
3250                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3251                         defcsw = con->con;
3252                         break;
3253                 }
3254         }
3255
3256         if (!defcsw)
3257                 goto err;
3258
3259         while (more) {
3260                 more = 0;
3261
3262                 for (i = con->first; i <= con->last; i++) {
3263                         if (con_driver_map[i] == defcsw) {
3264                                 if (first == -1)
3265                                         first = i;
3266                                 last = i;
3267                                 more = 1;
3268                         } else if (first != -1)
3269                                 break;
3270                 }
3271
3272                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3273                         deflt = 1;
3274
3275                 if (first != -1)
3276                         bind_con_driver(csw, first, last, deflt);
3277
3278                 first = -1;
3279                 last = -1;
3280                 deflt = 0;
3281         }
3282
3283 err:
3284         return 0;
3285 }
3286
3287 static int vt_unbind(struct con_driver *con)
3288 {
3289         const struct consw *csw = NULL;
3290         int i, more = 1, first = -1, last = -1, deflt = 0;
3291
3292         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3293             con_is_graphics(con->con, con->first, con->last))
3294                 goto err;
3295
3296         csw = con->con;
3297
3298         while (more) {
3299                 more = 0;
3300
3301                 for (i = con->first; i <= con->last; i++) {
3302                         if (con_driver_map[i] == csw) {
3303                                 if (first == -1)
3304                                         first = i;
3305                                 last = i;
3306                                 more = 1;
3307                         } else if (first != -1)
3308                                 break;
3309                 }
3310
3311                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3312                         deflt = 1;
3313
3314                 if (first != -1)
3315                         unbind_con_driver(csw, first, last, deflt);
3316
3317                 first = -1;
3318                 last = -1;
3319                 deflt = 0;
3320         }
3321
3322 err:
3323         return 0;
3324 }
3325 #else
3326 static inline int vt_bind(struct con_driver *con)
3327 {
3328         return 0;
3329 }
3330 static inline int vt_unbind(struct con_driver *con)
3331 {
3332         return 0;
3333 }
3334 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3335
3336 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3337                           const char *buf, size_t count)
3338 {
3339         struct con_driver *con = dev_get_drvdata(dev);
3340         int bind = simple_strtoul(buf, NULL, 0);
3341
3342         if (bind)
3343                 vt_bind(con);
3344         else
3345                 vt_unbind(con);
3346
3347         return count;
3348 }
3349
3350 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3351                          char *buf)
3352 {
3353         struct con_driver *con = dev_get_drvdata(dev);
3354         int bind = con_is_bound(con->con);
3355
3356         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3357 }
3358
3359 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3360                          char *buf)
3361 {
3362         struct con_driver *con = dev_get_drvdata(dev);
3363
3364         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3365                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3366                          con->desc);
3367
3368 }
3369
3370 static struct device_attribute device_attrs[] = {
3371         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3372         __ATTR(name, S_IRUGO, show_name, NULL),
3373 };
3374
3375 static int vtconsole_init_device(struct con_driver *con)
3376 {
3377         int i;
3378         int error = 0;
3379
3380         con->flag |= CON_DRIVER_FLAG_ATTR;
3381         dev_set_drvdata(con->dev, con);
3382         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3383                 error = device_create_file(con->dev, &device_attrs[i]);
3384                 if (error)
3385                         break;
3386         }
3387
3388         if (error) {
3389                 while (--i >= 0)
3390                         device_remove_file(con->dev, &device_attrs[i]);
3391                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3392         }
3393
3394         return error;
3395 }
3396
3397 static void vtconsole_deinit_device(struct con_driver *con)
3398 {
3399         int i;
3400
3401         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3402                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3403                         device_remove_file(con->dev, &device_attrs[i]);
3404                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3405         }
3406 }
3407
3408 /**
3409  * con_is_bound - checks if driver is bound to the console
3410  * @csw: console driver
3411  *
3412  * RETURNS: zero if unbound, nonzero if bound
3413  *
3414  * Drivers can call this and if zero, they should release
3415  * all resources allocated on con_startup()
3416  */
3417 int con_is_bound(const struct consw *csw)
3418 {
3419         int i, bound = 0;
3420
3421         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3422                 if (con_driver_map[i] == csw) {
3423                         bound = 1;
3424                         break;
3425                 }
3426         }
3427
3428         return bound;
3429 }
3430 EXPORT_SYMBOL(con_is_bound);
3431
3432 /**
3433  * con_debug_enter - prepare the console for the kernel debugger
3434  * @sw: console driver
3435  *
3436  * Called when the console is taken over by the kernel debugger, this
3437  * function needs to save the current console state, then put the console
3438  * into a state suitable for the kernel debugger.
3439  *
3440  * RETURNS:
3441  * Zero on success, nonzero if a failure occurred when trying to prepare
3442  * the console for the debugger.
3443  */
3444 int con_debug_enter(struct vc_data *vc)
3445 {
3446         int ret = 0;
3447
3448         saved_fg_console = fg_console;
3449         saved_last_console = last_console;
3450         saved_want_console = want_console;
3451         saved_vc_mode = vc->vc_mode;
3452         vc->vc_mode = KD_TEXT;
3453         console_blanked = 0;
3454         if (vc->vc_sw->con_debug_enter)
3455                 ret = vc->vc_sw->con_debug_enter(vc);
3456 #ifdef CONFIG_KGDB_KDB
3457         /* Set the initial LINES variable if it is not already set */
3458         if (vc->vc_rows < 999) {
3459                 int linecount;
3460                 char lns[4];
3461                 const char *setargs[3] = {
3462                         "set",
3463                         "LINES",
3464                         lns,
3465                 };
3466                 if (kdbgetintenv(setargs[0], &linecount)) {
3467                         snprintf(lns, 4, "%i", vc->vc_rows);
3468                         kdb_set(2, setargs);
3469                 }
3470         }
3471 #endif /* CONFIG_KGDB_KDB */
3472         return ret;
3473 }
3474 EXPORT_SYMBOL_GPL(con_debug_enter);
3475
3476 /**
3477  * con_debug_leave - restore console state
3478  * @sw: console driver
3479  *
3480  * Restore the console state to what it was before the kernel debugger
3481  * was invoked.
3482  *
3483  * RETURNS:
3484  * Zero on success, nonzero if a failure occurred when trying to restore
3485  * the console.
3486  */
3487 int con_debug_leave(void)
3488 {
3489         struct vc_data *vc;
3490         int ret = 0;
3491
3492         fg_console = saved_fg_console;
3493         last_console = saved_last_console;
3494         want_console = saved_want_console;
3495         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3496
3497         vc = vc_cons[fg_console].d;
3498         if (vc->vc_sw->con_debug_leave)
3499                 ret = vc->vc_sw->con_debug_leave(vc);
3500         return ret;
3501 }
3502 EXPORT_SYMBOL_GPL(con_debug_leave);
3503
3504 /**
3505  * register_con_driver - register console driver to console layer
3506  * @csw: console driver
3507  * @first: the first console to take over, minimum value is 0
3508  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3509  *
3510  * DESCRIPTION: This function registers a console driver which can later
3511  * bind to a range of consoles specified by @first and @last. It will
3512  * also initialize the console driver by calling con_startup().
3513  */
3514 int register_con_driver(const struct consw *csw, int first, int last)
3515 {
3516         struct module *owner = csw->owner;
3517         struct con_driver *con_driver;
3518         const char *desc;
3519         int i, retval = 0;
3520
3521         if (!try_module_get(owner))
3522                 return -ENODEV;
3523
3524         acquire_console_sem();
3525
3526         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3527                 con_driver = &registered_con_driver[i];
3528
3529                 /* already registered */
3530                 if (con_driver->con == csw)
3531                         retval = -EINVAL;
3532         }
3533
3534         if (retval)
3535                 goto err;
3536
3537         desc = csw->con_startup();
3538
3539         if (!desc)
3540                 goto err;
3541
3542         retval = -EINVAL;
3543
3544         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3545                 con_driver = &registered_con_driver[i];
3546
3547                 if (con_driver->con == NULL) {
3548                         con_driver->con = csw;
3549                         con_driver->desc = desc;
3550                         con_driver->node = i;
3551                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3552                                            CON_DRIVER_FLAG_INIT;
3553                         con_driver->first = first;
3554                         con_driver->last = last;
3555                         retval = 0;
3556                         break;
3557                 }
3558         }
3559
3560         if (retval)
3561                 goto err;
3562
3563         con_driver->dev = device_create(vtconsole_class, NULL,
3564                                                 MKDEV(0, con_driver->node),
3565                                                 NULL, "vtcon%i",
3566                                                 con_driver->node);
3567
3568         if (IS_ERR(con_driver->dev)) {
3569                 printk(KERN_WARNING "Unable to create device for %s; "
3570                        "errno = %ld\n", con_driver->desc,
3571                        PTR_ERR(con_driver->dev));
3572                 con_driver->dev = NULL;
3573         } else {
3574                 vtconsole_init_device(con_driver);
3575         }
3576
3577 err:
3578         release_console_sem();
3579         module_put(owner);
3580         return retval;
3581 }
3582 EXPORT_SYMBOL(register_con_driver);
3583
3584 /**
3585  * unregister_con_driver - unregister console driver from console layer
3586  * @csw: console driver
3587  *
3588  * DESCRIPTION: All drivers that registers to the console layer must
3589  * call this function upon exit, or if the console driver is in a state
3590  * where it won't be able to handle console services, such as the
3591  * framebuffer console without loaded framebuffer drivers.
3592  *
3593  * The driver must unbind first prior to unregistration.
3594  */
3595 int unregister_con_driver(const struct consw *csw)
3596 {
3597         int i, retval = -ENODEV;
3598
3599         acquire_console_sem();
3600
3601         /* cannot unregister a bound driver */
3602         if (con_is_bound(csw))
3603                 goto err;
3604
3605         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3606                 struct con_driver *con_driver = &registered_con_driver[i];
3607
3608                 if (con_driver->con == csw &&
3609                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3610                         vtconsole_deinit_device(con_driver);
3611                         device_destroy(vtconsole_class,
3612                                        MKDEV(0, con_driver->node));
3613                         con_driver->con = NULL;
3614                         con_driver->desc = NULL;
3615                         con_driver->dev = NULL;
3616                         con_driver->node = 0;
3617                         con_driver->flag = 0;
3618                         con_driver->first = 0;
3619                         con_driver->last = 0;
3620                         retval = 0;
3621                         break;
3622                 }
3623         }
3624 err:
3625         release_console_sem();
3626         return retval;
3627 }
3628 EXPORT_SYMBOL(unregister_con_driver);
3629
3630 /*
3631  *      If we support more console drivers, this function is used
3632  *      when a driver wants to take over some existing consoles
3633  *      and become default driver for newly opened ones.
3634  *
3635  *      take_over_console is basically a register followed by unbind
3636  */
3637 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3638 {
3639         int err;
3640
3641         err = register_con_driver(csw, first, last);
3642
3643         if (!err)
3644                 bind_con_driver(csw, first, last, deflt);
3645
3646         return err;
3647 }
3648
3649 /*
3650  * give_up_console is a wrapper to unregister_con_driver. It will only
3651  * work if driver is fully unbound.
3652  */
3653 void give_up_console(const struct consw *csw)
3654 {
3655         unregister_con_driver(csw);
3656 }
3657
3658 static int __init vtconsole_class_init(void)
3659 {
3660         int i;
3661
3662         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3663         if (IS_ERR(vtconsole_class)) {
3664                 printk(KERN_WARNING "Unable to create vt console class; "
3665                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3666                 vtconsole_class = NULL;
3667         }
3668
3669         /* Add system drivers to sysfs */
3670         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3671                 struct con_driver *con = &registered_con_driver[i];
3672
3673                 if (con->con && !con->dev) {
3674                         con->dev = device_create(vtconsole_class, NULL,
3675                                                          MKDEV(0, con->node),
3676                                                          NULL, "vtcon%i",
3677                                                          con->node);
3678
3679                         if (IS_ERR(con->dev)) {
3680                                 printk(KERN_WARNING "Unable to create "
3681                                        "device for %s; errno = %ld\n",
3682                                        con->desc, PTR_ERR(con->dev));
3683                                 con->dev = NULL;
3684                         } else {
3685                                 vtconsole_init_device(con);
3686                         }
3687                 }
3688         }
3689
3690         return 0;
3691 }
3692 postcore_initcall(vtconsole_class_init);
3693
3694 #endif
3695
3696 /*
3697  *      Screen blanking
3698  */
3699
3700 static int set_vesa_blanking(char __user *p)
3701 {
3702         unsigned int mode;
3703
3704         if (get_user(mode, p + 1))
3705                 return -EFAULT;
3706
3707         vesa_blank_mode = (mode < 4) ? mode : 0;
3708         return 0;
3709 }
3710
3711 void do_blank_screen(int entering_gfx)
3712 {
3713         struct vc_data *vc = vc_cons[fg_console].d;
3714         int i;
3715
3716         WARN_CONSOLE_UNLOCKED();
3717
3718         if (console_blanked) {
3719                 if (blank_state == blank_vesa_wait) {
3720                         blank_state = blank_off;
3721                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3722                 }
3723                 return;
3724         }
3725
3726         /* entering graphics mode? */
3727         if (entering_gfx) {
3728                 hide_cursor(vc);
3729                 save_screen(vc);
3730                 vc->vc_sw->con_blank(vc, -1, 1);
3731                 console_blanked = fg_console + 1;
3732                 blank_state = blank_off;
3733                 set_origin(vc);
3734                 return;
3735         }
3736
3737         if (blank_state != blank_normal_wait)
3738                 return;
3739         blank_state = blank_off;
3740
3741         /* don't blank graphics */
3742         if (vc->vc_mode != KD_TEXT) {
3743                 console_blanked = fg_console + 1;
3744                 return;
3745         }
3746
3747         hide_cursor(vc);
3748         del_timer_sync(&console_timer);
3749         blank_timer_expired = 0;
3750
3751         save_screen(vc);
3752         /* In case we need to reset origin, blanking hook returns 1 */
3753         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3754         console_blanked = fg_console + 1;
3755         if (i)
3756                 set_origin(vc);
3757
3758         if (console_blank_hook && console_blank_hook(1))
3759                 return;
3760
3761         if (vesa_off_interval && vesa_blank_mode) {
3762                 blank_state = blank_vesa_wait;
3763                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3764         }
3765         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3766 }
3767 EXPORT_SYMBOL(do_blank_screen);
3768
3769 /*
3770  * Called by timer as well as from vt_console_driver
3771  */
3772 void do_unblank_screen(int leaving_gfx)
3773 {
3774         struct vc_data *vc;
3775
3776         /* This should now always be called from a "sane" (read: can schedule)
3777          * context for the sake of the low level drivers, except in the special
3778          * case of oops_in_progress
3779          */
3780         if (!oops_in_progress)
3781                 might_sleep();
3782
3783         WARN_CONSOLE_UNLOCKED();
3784
3785         ignore_poke = 0;
3786         if (!console_blanked)
3787                 return;
3788         if (!vc_cons_allocated(fg_console)) {
3789                 /* impossible */
3790                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3791                 return;
3792         }
3793         vc = vc_cons[fg_console].d;
3794         /* Try to unblank in oops case too */
3795         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3796                 return; /* but leave console_blanked != 0 */
3797
3798         if (blankinterval) {
3799                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3800                 blank_state = blank_normal_wait;
3801         }
3802
3803         console_blanked = 0;
3804         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3805                 /* Low-level driver cannot restore -> do it ourselves */
3806                 update_screen(vc);
3807         if (console_blank_hook)
3808                 console_blank_hook(0);
3809         set_palette(vc);
3810         set_cursor(vc);
3811         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3812 }
3813 EXPORT_SYMBOL(do_unblank_screen);
3814
3815 /*
3816  * This is called by the outside world to cause a forced unblank, mostly for
3817  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3818  * call it with 1 as an argument and so force a mode restore... that may kill
3819  * X or at least garbage the screen but would also make the Oops visible...
3820  */
3821 void unblank_screen(void)
3822 {
3823         do_unblank_screen(0);
3824 }
3825
3826 /*
3827  * We defer the timer blanking to work queue so it can take the console mutex
3828  * (console operations can still happen at irq time, but only from printk which
3829  * has the console mutex. Not perfect yet, but better than no locking
3830  */
3831 static void blank_screen_t(unsigned long dummy)
3832 {
3833         if (unlikely(!keventd_up())) {
3834                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3835                 return;
3836         }
3837         blank_timer_expired = 1;
3838         schedule_work(&console_work);
3839 }
3840
3841 void poke_blanked_console(void)
3842 {
3843         WARN_CONSOLE_UNLOCKED();
3844
3845         /* Add this so we quickly catch whoever might call us in a non
3846          * safe context. Nowadays, unblank_screen() isn't to be called in
3847          * atomic contexts and is allowed to schedule (with the special case
3848          * of oops_in_progress, but that isn't of any concern for this
3849          * function. --BenH.
3850          */
3851         might_sleep();
3852
3853         /* This isn't perfectly race free, but a race here would be mostly harmless,
3854          * at worse, we'll do a spurrious blank and it's unlikely
3855          */
3856         del_timer(&console_timer);
3857         blank_timer_expired = 0;
3858
3859         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3860                 return;
3861         if (console_blanked)
3862                 unblank_screen();
3863         else if (blankinterval) {
3864                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3865                 blank_state = blank_normal_wait;
3866         }
3867 }
3868
3869 /*
3870  *      Palettes
3871  */
3872
3873 static void set_palette(struct vc_data *vc)
3874 {
3875         WARN_CONSOLE_UNLOCKED();
3876
3877         if (vc->vc_mode != KD_GRAPHICS)
3878                 vc->vc_sw->con_set_palette(vc, color_table);
3879 }
3880
3881 static int set_get_cmap(unsigned char __user *arg, int set)
3882 {
3883     int i, j, k;
3884
3885     WARN_CONSOLE_UNLOCKED();
3886
3887     for (i = 0; i < 16; i++)
3888         if (set) {
3889             get_user(default_red[i], arg++);
3890             get_user(default_grn[i], arg++);
3891             get_user(default_blu[i], arg++);
3892         } else {
3893             put_user(default_red[i], arg++);
3894             put_user(default_grn[i], arg++);
3895             put_user(default_blu[i], arg++);
3896         }
3897     if (set) {
3898         for (i = 0; i < MAX_NR_CONSOLES; i++)
3899             if (vc_cons_allocated(i)) {
3900                 for (j = k = 0; j < 16; j++) {
3901                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3902                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3903                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3904                 }
3905                 set_palette(vc_cons[i].d);
3906             }
3907     }
3908     return 0;
3909 }
3910
3911 /*
3912  * Load palette into the DAC registers. arg points to a colour
3913  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3914  */
3915
3916 int con_set_cmap(unsigned char __user *arg)
3917 {
3918         int rc;
3919
3920         acquire_console_sem();
3921         rc = set_get_cmap (arg,1);
3922         release_console_sem();
3923
3924         return rc;
3925 }
3926
3927 int con_get_cmap(unsigned char __user *arg)
3928 {
3929         int rc;
3930
3931         acquire_console_sem();
3932         rc = set_get_cmap (arg,0);
3933         release_console_sem();
3934
3935         return rc;
3936 }
3937
3938 void reset_palette(struct vc_data *vc)
3939 {
3940         int j, k;
3941         for (j=k=0; j<16; j++) {
3942                 vc->vc_palette[k++] = default_red[j];
3943                 vc->vc_palette[k++] = default_grn[j];
3944                 vc->vc_palette[k++] = default_blu[j];
3945         }
3946         set_palette(vc);
3947 }
3948
3949 /*
3950  *  Font switching
3951  *
3952  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3953  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3954  *  depending on width) reserved for each character which is kinda wasty, but
3955  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3956  *  is upto the actual low-level console-driver convert data into its favorite
3957  *  format (maybe we should add a `fontoffset' field to the `display'
3958  *  structure so we won't have to convert the fontdata all the time.
3959  *  /Jes
3960  */
3961
3962 #define max_font_size 65536
3963
3964 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3965 {
3966         struct console_font font;
3967         int rc = -EINVAL;
3968         int c;
3969
3970         if (vc->vc_mode != KD_TEXT)
3971                 return -EINVAL;
3972
3973         if (op->data) {
3974                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3975                 if (!font.data)
3976                         return -ENOMEM;
3977         } else
3978                 font.data = NULL;
3979
3980         acquire_console_sem();
3981         if (vc->vc_sw->con_font_get)
3982                 rc = vc->vc_sw->con_font_get(vc, &font);
3983         else
3984                 rc = -ENOSYS;
3985         release_console_sem();
3986
3987         if (rc)
3988                 goto out;
3989
3990         c = (font.width+7)/8 * 32 * font.charcount;
3991
3992         if (op->data && font.charcount > op->charcount)
3993                 rc = -ENOSPC;
3994         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3995                 if (font.width > op->width || font.height > op->height)
3996                         rc = -ENOSPC;
3997         } else {
3998                 if (font.width != 8)
3999                         rc = -EIO;
4000                 else if ((op->height && font.height > op->height) ||
4001                          font.height > 32)
4002                         rc = -ENOSPC;
4003         }
4004         if (rc)
4005                 goto out;
4006
4007         op->height = font.height;
4008         op->width = font.width;
4009         op->charcount = font.charcount;
4010
4011         if (op->data && copy_to_user(op->data, font.data, c))
4012                 rc = -EFAULT;
4013
4014 out:
4015         kfree(font.data);
4016         return rc;
4017 }
4018
4019 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4020 {
4021         struct console_font font;
4022         int rc = -EINVAL;
4023         int size;
4024
4025         if (vc->vc_mode != KD_TEXT)
4026                 return -EINVAL;
4027         if (!op->data)
4028                 return -EINVAL;
4029         if (op->charcount > 512)
4030                 return -EINVAL;
4031         if (!op->height) {              /* Need to guess font height [compat] */
4032                 int h, i;
4033                 u8 __user *charmap = op->data;
4034                 u8 tmp;
4035
4036                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4037                    so that we can get rid of this soon */
4038                 if (!(op->flags & KD_FONT_FLAG_OLD))
4039                         return -EINVAL;
4040                 for (h = 32; h > 0; h--)
4041                         for (i = 0; i < op->charcount; i++) {
4042                                 if (get_user(tmp, &charmap[32*i+h-1]))
4043                                         return -EFAULT;
4044                                 if (tmp)
4045                                         goto nonzero;
4046                         }
4047                 return -EINVAL;
4048         nonzero:
4049                 op->height = h;
4050         }
4051         if (op->width <= 0 || op->width > 32 || op->height > 32)
4052                 return -EINVAL;
4053         size = (op->width+7)/8 * 32 * op->charcount;
4054         if (size > max_font_size)
4055                 return -ENOSPC;
4056         font.charcount = op->charcount;
4057         font.height = op->height;
4058         font.width = op->width;
4059         font.data = memdup_user(op->data, size);
4060         if (IS_ERR(font.data))
4061                 return PTR_ERR(font.data);
4062         acquire_console_sem();
4063         if (vc->vc_sw->con_font_set)
4064                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4065         else
4066                 rc = -ENOSYS;
4067         release_console_sem();
4068         kfree(font.data);
4069         return rc;
4070 }
4071
4072 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4073 {
4074         struct console_font font = {.width = op->width, .height = op->height};
4075         char name[MAX_FONT_NAME];
4076         char *s = name;
4077         int rc;
4078
4079         if (vc->vc_mode != KD_TEXT)
4080                 return -EINVAL;
4081
4082         if (!op->data)
4083                 s = NULL;
4084         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4085                 return -EFAULT;
4086         else
4087                 name[MAX_FONT_NAME - 1] = 0;
4088
4089         acquire_console_sem();
4090         if (vc->vc_sw->con_font_default)
4091                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4092         else
4093                 rc = -ENOSYS;
4094         release_console_sem();
4095         if (!rc) {
4096                 op->width = font.width;
4097                 op->height = font.height;
4098         }
4099         return rc;
4100 }
4101
4102 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4103 {
4104         int con = op->height;
4105         int rc;
4106
4107         if (vc->vc_mode != KD_TEXT)
4108                 return -EINVAL;
4109
4110         acquire_console_sem();
4111         if (!vc->vc_sw->con_font_copy)
4112                 rc = -ENOSYS;
4113         else if (con < 0 || !vc_cons_allocated(con))
4114                 rc = -ENOTTY;
4115         else if (con == vc->vc_num)     /* nothing to do */
4116                 rc = 0;
4117         else
4118                 rc = vc->vc_sw->con_font_copy(vc, con);
4119         release_console_sem();
4120         return rc;
4121 }
4122
4123 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4124 {
4125         switch (op->op) {
4126         case KD_FONT_OP_SET:
4127                 return con_font_set(vc, op);
4128         case KD_FONT_OP_GET:
4129                 return con_font_get(vc, op);
4130         case KD_FONT_OP_SET_DEFAULT:
4131                 return con_font_default(vc, op);
4132         case KD_FONT_OP_COPY:
4133                 return con_font_copy(vc, op);
4134         }
4135         return -ENOSYS;
4136 }
4137
4138 /*
4139  *      Interface exported to selection and vcs.
4140  */
4141
4142 /* used by selection */
4143 u16 screen_glyph(struct vc_data *vc, int offset)
4144 {
4145         u16 w = scr_readw(screenpos(vc, offset, 1));
4146         u16 c = w & 0xff;
4147
4148         if (w & vc->vc_hi_font_mask)
4149                 c |= 0x100;
4150         return c;
4151 }
4152 EXPORT_SYMBOL_GPL(screen_glyph);
4153
4154 /* used by vcs - note the word offset */
4155 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4156 {
4157         return screenpos(vc, 2 * w_offset, viewed);
4158 }
4159
4160 void getconsxy(struct vc_data *vc, unsigned char *p)
4161 {
4162         p[0] = vc->vc_x;
4163         p[1] = vc->vc_y;
4164 }
4165
4166 void putconsxy(struct vc_data *vc, unsigned char *p)
4167 {
4168         hide_cursor(vc);
4169         gotoxy(vc, p[0], p[1]);
4170         set_cursor(vc);
4171 }
4172
4173 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4174 {
4175         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4176                 return softcursor_original;
4177         return scr_readw(org);
4178 }
4179
4180 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4181 {
4182         scr_writew(val, org);
4183         if ((unsigned long)org == vc->vc_pos) {
4184                 softcursor_original = -1;
4185                 add_softcursor(vc);
4186         }
4187 }
4188
4189 /*
4190  *      Visible symbols for modules
4191  */
4192
4193 EXPORT_SYMBOL(color_table);
4194 EXPORT_SYMBOL(default_red);
4195 EXPORT_SYMBOL(default_grn);
4196 EXPORT_SYMBOL(default_blu);
4197 EXPORT_SYMBOL(update_region);
4198 EXPORT_SYMBOL(redraw_screen);
4199 EXPORT_SYMBOL(vc_resize);
4200 EXPORT_SYMBOL(fg_console);
4201 EXPORT_SYMBOL(console_blank_hook);
4202 EXPORT_SYMBOL(console_blanked);
4203 EXPORT_SYMBOL(vc_cons);
4204 EXPORT_SYMBOL(global_cursor_default);
4205 #ifndef VT_SINGLE_DRIVER
4206 EXPORT_SYMBOL(take_over_console);
4207 EXPORT_SYMBOL(give_up_console);
4208 #endif