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