drivers/tty/vt/vt.c

   1 /*
   2  *  Copyright (C) 1991, 1992  Linus Torvalds
   3  */
   4
   5 /*
   6  * Hopefully this will be a rather complete VT102 implementation.
   7  *
   8  * Beeping thanks to John T Kohl.
   9  *
  10  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  11  *   Chars, and VT100 enhancements by Peter MacDonald.
  12  *
  13  * Copy and paste function by Andrew Haylett,
  14  *   some enhancements by Alessandro Rubini.
  15  *
  16  * Code to check for different video-cards mostly by Galen Hunt,
  17  * <g-hunt@ee.utah.edu>
  18  *
  19  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  20  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  21  *
  22  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  23  * Resizing of consoles, aeb, 940926
  24  *
  25  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  26  * <poe@daimi.aau.dk>
  27  *
  28  * User-defined bell sound, new setterm control sequences and printk
  29  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  30  *
  31  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  32  *
  33  * Merge with the abstract console driver by Geert Uytterhoeven
  34  * <geert@linux-m68k.org>, Jan 1997.
  35  *
  36  *   Original m68k console driver modifications by
  37  *
  38  *     - Arno Griffioen <arno@usn.nl>
  39  *     - David Carter <carter@cs.bris.ac.uk>
  40  *
  41  *   The abstract console driver provides a generic interface for a text
  42  *   console. It supports VGA text mode, frame buffer based graphical consoles
  43  *   and special graphics processors that are only accessible through some
  44  *   registers (e.g. a TMS340x0 GSP).
  45  *
  46  *   The interface to the hardware is specified using a special structure
  47  *   (struct consw) which contains function pointers to console operations
  48  *   (see <linux/console.h> for more information).
  49  *
  50  * Support for changeable cursor shape
  51  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  52  *
  53  * Ported to i386 and con_scrolldelta fixed
  54  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  55  *
  56  * Resurrected character buffers in videoram plus lots of other trickery
  57  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  58  *
  59  * Removed old-style timers, introduced console_timer, made timer
  60  * deletion SMP-safe.  17Jun00, Andrew Morton
  61  *
  62  * Removed console_lock, enabled interrupts across all console operations
  63  * 13 March 2001, Andrew Morton
  64  *
  65  * Fixed UTF-8 mode so alternate charset modes always work according
  66  * to control sequences interpreted in do_con_trol function
  67  * preserving backward VT100 semigraphics compatibility,
  68  * malformed UTF sequences represented as sequences of replacement glyphs,
  69  * original codes or '?' as a last resort if replacement glyph is undefined
  70  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/types.h>
  75 #include <linux/sched.h>
  76 #include <linux/tty.h>
  77 #include <linux/tty_flip.h>
  78 #include <linux/kernel.h>
  79 #include <linux/string.h>
  80 #include <linux/errno.h>
  81 #include <linux/kd.h>
  82 #include <linux/slab.h>
  83 #include <linux/major.h>
  84 #include <linux/mm.h>
  85 #include <linux/console.h>
  86 #include <linux/init.h>
  87 #include <linux/mutex.h>
  88 #include <linux/vt_kern.h>
  89 #include <linux/selection.h>
  90 #include <linux/tiocl.h>
  91 #include <linux/kbd_kern.h>
  92 #include <linux/consolemap.h>
  93 #include <linux/timer.h>
  94 #include <linux/interrupt.h>
  95 #include <linux/workqueue.h>
  96 #include <linux/pm.h>
  97 #include <linux/font.h>
  98 #include <linux/bitops.h>
  99 #include <linux/notifier.h>
 100 #include <linux/device.h>
 101 #include <linux/io.h>
 102 #include <linux/uaccess.h>
 103 #include <linux/kdb.h>
 104 #include <linux/ctype.h>
 105
 106 #define MAX_NR_CON_DRIVER 16
 107
 108 #define CON_DRIVER_FLAG_MODULE 1
 109 #define CON_DRIVER_FLAG_INIT   2
 110 #define CON_DRIVER_FLAG_ATTR   4
 111
 112 struct con_driver {
 113         const struct consw *con;
 114         const char *desc;
 115         struct device *dev;
 116         int node;
 117         int first;
 118         int last;
 119         int flag;
 120 };
 121
 122 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 123 const struct consw *conswitchp;
 124
 125 /* A bitmap for codes <32. A bit of 1 indicates that the code
 126  * corresponding to that bit number invokes some special action
 127  * (such as cursor movement) and should not be displayed as a
 128  * glyph unless the disp_ctrl mode is explicitly enabled.
 129  */
 130 #define CTRL_ACTION 0x0d00ff81
 131 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 132
 133 /*
 134  * Here is the default bell parameters: 750HZ, 1/8th of a second
 135  */
 136 #define DEFAULT_BELL_PITCH      750
 137 #define DEFAULT_BELL_DURATION   (HZ/8)
 138
 139 struct vc vc_cons [MAX_NR_CONSOLES];
 140
 141 #ifndef VT_SINGLE_DRIVER
 142 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 143 #endif
 144
 145 static int con_open(struct tty_struct *, struct file *);
 146 static void vc_init(struct vc_data *vc, unsigned int rows,
 147                     unsigned int cols, int do_clear);
 148 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 149 static void save_cur(struct vc_data *vc);
 150 static void reset_terminal(struct vc_data *vc, int do_clear);
 151 static void con_flush_chars(struct tty_struct *tty);
 152 static int set_vesa_blanking(char __user *p);
 153 static void set_cursor(struct vc_data *vc);
 154 static void hide_cursor(struct vc_data *vc);
 155 static void console_callback(struct work_struct *ignored);
 156 static void blank_screen_t(unsigned long dummy);
 157 static void set_palette(struct vc_data *vc);
 158
 159 static int printable;           /* Is console ready for printing? */
 160 int default_utf8 = true;
 161 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 162 int global_cursor_default = -1;
 163 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 164
 165 static int cur_default = CUR_DEFAULT;
 166 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 167
 168 /*
 169  * ignore_poke: don't unblank the screen when things are typed.  This is
 170  * mainly for the privacy of braille terminal users.
 171  */
 172 static int ignore_poke;
 173
 174 int do_poke_blanked_console;
 175 int console_blanked;
 176
 177 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 178 static int vesa_off_interval;
 179 static int blankinterval = 10*60;
 180 core_param(consoleblank, blankinterval, int, 0444);
 181
 182 static DECLARE_WORK(console_work, console_callback);
 183
 184 /*
 185  * fg_console is the current virtual console,
 186  * last_console is the last used one,
 187  * want_console is the console we want to switch to,
 188  * saved_* variants are for save/restore around kernel debugger enter/leave
 189  */
 190 int fg_console;
 191 int last_console;
 192 int want_console = -1;
 193 static int saved_fg_console;
 194 static int saved_last_console;
 195 static int saved_want_console;
 196 static int saved_vc_mode;
 197 static int saved_console_blanked;
 198
 199 /*
 200  * For each existing display, we have a pointer to console currently visible
 201  * on that display, allowing consoles other than fg_console to be refreshed
 202  * appropriately. Unless the low-level driver supplies its own display_fg
 203  * variable, we use this one for the "master display".
 204  */
 205 static struct vc_data *master_display_fg;
 206
 207 /*
 208  * Unfortunately, we need to delay tty echo when we're currently writing to the
 209  * console since the code is (and always was) not re-entrant, so we schedule
 210  * all flip requests to process context with schedule-task() and run it from
 211  * console_callback().
 212  */
 213
 214 /*
 215  * For the same reason, we defer scrollback to the console callback.
 216  */
 217 static int scrollback_delta;
 218
 219 /*
 220  * Hook so that the power management routines can (un)blank
 221  * the console on our behalf.
 222  */
 223 int (*console_blank_hook)(int);
 224
 225 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 226 static int blank_state;
 227 static int blank_timer_expired;
 228 enum {
 229         blank_off = 0,
 230         blank_normal_wait,
 231         blank_vesa_wait,
 232 };
 233
 234 /*
 235  * /sys/class/tty/tty0/
 236  *
 237  * the attribute 'active' contains the name of the current vc
 238  * console and it supports poll() to detect vc switches
 239  */
 240 static struct device *tty0dev;
 241
 242 /*
 243  * Notifier list for console events.
 244  */
 245 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 246
 247 int register_vt_notifier(struct notifier_block *nb)
 248 {
 249         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 250 }
 251 EXPORT_SYMBOL_GPL(register_vt_notifier);
 252
 253 int unregister_vt_notifier(struct notifier_block *nb)
 254 {
 255         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 256 }
 257 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 258
 259 static void notify_write(struct vc_data *vc, unsigned int unicode)
 260 {
 261         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 262         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 263 }
 264
 265 static void notify_update(struct vc_data *vc)
 266 {
 267         struct vt_notifier_param param = { .vc = vc };
 268         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 269 }
 270 /*
 271  *      Low-Level Functions
 272  */
 273
 274 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 275
 276 #ifdef VT_BUF_VRAM_ONLY
 277 #define DO_UPDATE(vc)   0
 278 #else
 279 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 280 #endif
 281
 282 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 283 {
 284         unsigned short *p;
 285
 286         if (!viewed)
 287                 p = (unsigned short *)(vc->vc_origin + offset);
 288         else if (!vc->vc_sw->con_screen_pos)
 289                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 290         else
 291                 p = vc->vc_sw->con_screen_pos(vc, offset);
 292         return p;
 293 }
 294
 295 /* Called  from the keyboard irq path.. */
 296 static inline void scrolldelta(int lines)
 297 {
 298         /* FIXME */
 299         /* scrolldelta needs some kind of consistency lock, but the BKL was
 300            and still is not protecting versus the scheduled back end */
 301         scrollback_delta += lines;
 302         schedule_console_callback();
 303 }
 304
 305 void schedule_console_callback(void)
 306 {
 307         schedule_work(&console_work);
 308 }
 309
 310 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 311 {
 312         unsigned short *d, *s;
 313
 314         if (t+nr >= b)
 315                 nr = b - t - 1;
 316         if (b > vc->vc_rows || t >= b || nr < 1)
 317                 return;
 318         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 319                 return;
 320         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 321         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 322         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 323         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 324                     vc->vc_size_row * nr);
 325 }
 326
 327 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 328 {
 329         unsigned short *s;
 330         unsigned int step;
 331
 332         if (t+nr >= b)
 333                 nr = b - t - 1;
 334         if (b > vc->vc_rows || t >= b || nr < 1)
 335                 return;
 336         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 337                 return;
 338         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 339         step = vc->vc_cols * nr;
 340         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 341         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 342 }
 343
 344 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 345 {
 346 #ifndef VT_BUF_VRAM_ONLY
 347         unsigned int xx, yy, offset;
 348         u16 *p;
 349
 350         p = (u16 *) start;
 351         if (!vc->vc_sw->con_getxy) {
 352                 offset = (start - vc->vc_origin) / 2;
 353                 xx = offset % vc->vc_cols;
 354                 yy = offset / vc->vc_cols;
 355         } else {
 356                 int nxx, nyy;
 357                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 358                 xx = nxx; yy = nyy;
 359         }
 360         for(;;) {
 361                 u16 attrib = scr_readw(p) & 0xff00;
 362                 int startx = xx;
 363                 u16 *q = p;
 364                 while (xx < vc->vc_cols && count) {
 365                         if (attrib != (scr_readw(p) & 0xff00)) {
 366                                 if (p > q)
 367                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 368                                 startx = xx;
 369                                 q = p;
 370                                 attrib = scr_readw(p) & 0xff00;
 371                         }
 372                         p++;
 373                         xx++;
 374                         count--;
 375                 }
 376                 if (p > q)
 377                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 378                 if (!count)
 379                         break;
 380                 xx = 0;
 381                 yy++;
 382                 if (vc->vc_sw->con_getxy) {
 383                         p = (u16 *)start;
 384                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 385                 }
 386         }
 387 #endif
 388 }
 389
 390 void update_region(struct vc_data *vc, unsigned long start, int count)
 391 {
 392         WARN_CONSOLE_UNLOCKED();
 393
 394         if (DO_UPDATE(vc)) {
 395                 hide_cursor(vc);
 396                 do_update_region(vc, start, count);
 397                 set_cursor(vc);
 398         }
 399 }
 400
 401 /* Structure of attributes is hardware-dependent */
 402
 403 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 404     u8 _underline, u8 _reverse, u8 _italic)
 405 {
 406         if (vc->vc_sw->con_build_attr)
 407                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 408                        _blink, _underline, _reverse, _italic);
 409
 410 #ifndef VT_BUF_VRAM_ONLY
 411 /*
 412  * ++roman: I completely changed the attribute format for monochrome
 413  * mode (!can_do_color). The formerly used MDA (monochrome display
 414  * adapter) format didn't allow the combination of certain effects.
 415  * Now the attribute is just a bit vector:
 416  *  Bit 0..1: intensity (0..2)
 417  *  Bit 2   : underline
 418  *  Bit 3   : reverse
 419  *  Bit 7   : blink
 420  */
 421         {
 422         u8 a = _color;
 423         if (!vc->vc_can_do_color)
 424                 return _intensity |
 425                        (_italic ? 2 : 0) |
 426                        (_underline ? 4 : 0) |
 427                        (_reverse ? 8 : 0) |
 428                        (_blink ? 0x80 : 0);
 429         if (_italic)
 430                 a = (a & 0xF0) | vc->vc_itcolor;
 431         else if (_underline)
 432                 a = (a & 0xf0) | vc->vc_ulcolor;
 433         else if (_intensity == 0)
 434                 a = (a & 0xf0) | vc->vc_ulcolor;
 435         if (_reverse)
 436                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 437         if (_blink)
 438                 a ^= 0x80;
 439         if (_intensity == 2)
 440                 a ^= 0x08;
 441         if (vc->vc_hi_font_mask == 0x100)
 442                 a <<= 1;
 443         return a;
 444         }
 445 #else
 446         return 0;
 447 #endif
 448 }
 449
 450 static void update_attr(struct vc_data *vc)
 451 {
 452         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 453                       vc->vc_blink, vc->vc_underline,
 454                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 455         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 456 }
 457
 458 /* Note: inverting the screen twice should revert to the original state */
 459 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 460 {
 461         unsigned short *p;
 462
 463         WARN_CONSOLE_UNLOCKED();
 464
 465         count /= 2;
 466         p = screenpos(vc, offset, viewed);
 467         if (vc->vc_sw->con_invert_region)
 468                 vc->vc_sw->con_invert_region(vc, p, count);
 469 #ifndef VT_BUF_VRAM_ONLY
 470         else {
 471                 u16 *q = p;
 472                 int cnt = count;
 473                 u16 a;
 474
 475                 if (!vc->vc_can_do_color) {
 476                         while (cnt--) {
 477                             a = scr_readw(q);
 478                             a ^= 0x0800;
 479                             scr_writew(a, q);
 480                             q++;
 481                         }
 482                 } else if (vc->vc_hi_font_mask == 0x100) {
 483                         while (cnt--) {
 484                                 a = scr_readw(q);
 485                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 486                                 scr_writew(a, q);
 487                                 q++;
 488                         }
 489                 } else {
 490                         while (cnt--) {
 491                                 a = scr_readw(q);
 492                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 493                                 scr_writew(a, q);
 494                                 q++;
 495                         }
 496                 }
 497         }
 498 #endif
 499         if (DO_UPDATE(vc))
 500                 do_update_region(vc, (unsigned long) p, count);
 501 }
 502
 503 /* used by selection: complement pointer position */
 504 void complement_pos(struct vc_data *vc, int offset)
 505 {
 506         static int old_offset = -1;
 507         static unsigned short old;
 508         static unsigned short oldx, oldy;
 509
 510         WARN_CONSOLE_UNLOCKED();
 511
 512         if (old_offset != -1 && old_offset >= 0 &&
 513             old_offset < vc->vc_screenbuf_size) {
 514                 scr_writew(old, screenpos(vc, old_offset, 1));
 515                 if (DO_UPDATE(vc))
 516                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 517         }
 518
 519         old_offset = offset;
 520
 521         if (offset != -1 && offset >= 0 &&
 522             offset < vc->vc_screenbuf_size) {
 523                 unsigned short new;
 524                 unsigned short *p;
 525                 p = screenpos(vc, offset, 1);
 526                 old = scr_readw(p);
 527                 new = old ^ vc->vc_complement_mask;
 528                 scr_writew(new, p);
 529                 if (DO_UPDATE(vc)) {
 530                         oldx = (offset >> 1) % vc->vc_cols;
 531                         oldy = (offset >> 1) / vc->vc_cols;
 532                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 533                 }
 534         }
 535
 536 }
 537
 538 static void insert_char(struct vc_data *vc, unsigned int nr)
 539 {
 540         unsigned short *p = (unsigned short *) vc->vc_pos;
 541
 542         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 543         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 544         vc->vc_need_wrap = 0;
 545         if (DO_UPDATE(vc))
 546                 do_update_region(vc, (unsigned long) p,
 547                         vc->vc_cols - vc->vc_x);
 548 }
 549
 550 static void delete_char(struct vc_data *vc, unsigned int nr)
 551 {
 552         unsigned short *p = (unsigned short *) vc->vc_pos;
 553
 554         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 555         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 556                         nr * 2);
 557         vc->vc_need_wrap = 0;
 558         if (DO_UPDATE(vc))
 559                 do_update_region(vc, (unsigned long) p,
 560                         vc->vc_cols - vc->vc_x);
 561 }
 562
 563 static int softcursor_original;
 564
 565 static void add_softcursor(struct vc_data *vc)
 566 {
 567         int i = scr_readw((u16 *) vc->vc_pos);
 568         u32 type = vc->vc_cursor_type;
 569
 570         if (! (type & 0x10)) return;
 571         if (softcursor_original != -1) return;
 572         softcursor_original = i;
 573         i |= ((type >> 8) & 0xff00 );
 574         i ^= ((type) & 0xff00 );
 575         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 576         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 577         scr_writew(i, (u16 *) vc->vc_pos);
 578         if (DO_UPDATE(vc))
 579                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 580 }
 581
 582 static void hide_softcursor(struct vc_data *vc)
 583 {
 584         if (softcursor_original != -1) {
 585                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 586                 if (DO_UPDATE(vc))
 587                         vc->vc_sw->con_putc(vc, softcursor_original,
 588                                         vc->vc_y, vc->vc_x);
 589                 softcursor_original = -1;
 590         }
 591 }
 592
 593 static void hide_cursor(struct vc_data *vc)
 594 {
 595         if (vc == sel_cons)
 596                 clear_selection();
 597         vc->vc_sw->con_cursor(vc, CM_ERASE);
 598         hide_softcursor(vc);
 599 }
 600
 601 static void set_cursor(struct vc_data *vc)
 602 {
 603         if (!IS_FG(vc) || console_blanked ||
 604             vc->vc_mode == KD_GRAPHICS)
 605                 return;
 606         if (vc->vc_deccm) {
 607                 if (vc == sel_cons)
 608                         clear_selection();
 609                 add_softcursor(vc);
 610                 if ((vc->vc_cursor_type & 0x0f) != 1)
 611                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 612         } else
 613                 hide_cursor(vc);
 614 }
 615
 616 static void set_origin(struct vc_data *vc)
 617 {
 618         WARN_CONSOLE_UNLOCKED();
 619
 620         if (!CON_IS_VISIBLE(vc) ||
 621             !vc->vc_sw->con_set_origin ||
 622             !vc->vc_sw->con_set_origin(vc))
 623                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 624         vc->vc_visible_origin = vc->vc_origin;
 625         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 626         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 627 }
 628
 629 static inline void save_screen(struct vc_data *vc)
 630 {
 631         WARN_CONSOLE_UNLOCKED();
 632
 633         if (vc->vc_sw->con_save_screen)
 634                 vc->vc_sw->con_save_screen(vc);
 635 }
 636
 637 /*
 638  *      Redrawing of screen
 639  */
 640
 641 void clear_buffer_attributes(struct vc_data *vc)
 642 {
 643         unsigned short *p = (unsigned short *)vc->vc_origin;
 644         int count = vc->vc_screenbuf_size / 2;
 645         int mask = vc->vc_hi_font_mask | 0xff;
 646
 647         for (; count > 0; count--, p++) {
 648                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 649         }
 650 }
 651
 652 void redraw_screen(struct vc_data *vc, int is_switch)
 653 {
 654         int redraw = 0;
 655
 656         WARN_CONSOLE_UNLOCKED();
 657
 658         if (!vc) {
 659                 /* strange ... */
 660                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 661                 return;
 662         }
 663
 664         if (is_switch) {
 665                 struct vc_data *old_vc = vc_cons[fg_console].d;
 666                 if (old_vc == vc)
 667                         return;
 668                 if (!CON_IS_VISIBLE(vc))
 669                         redraw = 1;
 670                 *vc->vc_display_fg = vc;
 671                 fg_console = vc->vc_num;
 672                 hide_cursor(old_vc);
 673                 if (!CON_IS_VISIBLE(old_vc)) {
 674                         save_screen(old_vc);
 675                         set_origin(old_vc);
 676                 }
 677                 if (tty0dev)
 678                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 679         } else {
 680                 hide_cursor(vc);
 681                 redraw = 1;
 682         }
 683
 684         if (redraw) {
 685                 int update;
 686                 int old_was_color = vc->vc_can_do_color;
 687
 688                 set_origin(vc);
 689                 update = vc->vc_sw->con_switch(vc);
 690                 set_palette(vc);
 691                 /*
 692                  * If console changed from mono<->color, the best we can do
 693                  * is to clear the buffer attributes. As it currently stands,
 694                  * rebuilding new attributes from the old buffer is not doable
 695                  * without overly complex code.
 696                  */
 697                 if (old_was_color != vc->vc_can_do_color) {
 698                         update_attr(vc);
 699                         clear_buffer_attributes(vc);
 700                 }
 701
 702                 /* Forcibly update if we're panicing */
 703                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 704                     vt_force_oops_output(vc))
 705                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 706         }
 707         set_cursor(vc);
 708         if (is_switch) {
 709                 set_leds();
 710                 compute_shiftstate();
 711                 notify_update(vc);
 712         }
 713 }
 714
 715 /*
 716  *      Allocation, freeing and resizing of VTs.
 717  */
 718
 719 int vc_cons_allocated(unsigned int i)
 720 {
 721         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 722 }
 723
 724 static void visual_init(struct vc_data *vc, int num, int init)
 725 {
 726         /* ++Geert: vc->vc_sw->con_init determines console size */
 727         if (vc->vc_sw)
 728                 module_put(vc->vc_sw->owner);
 729         vc->vc_sw = conswitchp;
 730 #ifndef VT_SINGLE_DRIVER
 731         if (con_driver_map[num])
 732                 vc->vc_sw = con_driver_map[num];
 733 #endif
 734         __module_get(vc->vc_sw->owner);
 735         vc->vc_num = num;
 736         vc->vc_display_fg = &master_display_fg;
 737         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 738         vc->vc_uni_pagedir = NULL;
 739         vc->vc_hi_font_mask = 0;
 740         vc->vc_complement_mask = 0;
 741         vc->vc_can_do_color = 0;
 742         vc->vc_panic_force_write = false;
 743         vc->vc_sw->con_init(vc, init);
 744         if (!vc->vc_complement_mask)
 745                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 746         vc->vc_s_complement_mask = vc->vc_complement_mask;
 747         vc->vc_size_row = vc->vc_cols << 1;
 748         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 749 }
 750
 751 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 752 {
 753         WARN_CONSOLE_UNLOCKED();
 754
 755         if (currcons >= MAX_NR_CONSOLES)
 756                 return -ENXIO;
 757         if (!vc_cons[currcons].d) {
 758             struct vc_data *vc;
 759             struct vt_notifier_param param;
 760
 761             /* prevent users from taking too much memory */
 762             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 763               return -EPERM;
 764
 765             /* due to the granularity of kmalloc, we waste some memory here */
 766             /* the alloc is done in two steps, to optimize the common situation
 767                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 768             /* although the numbers above are not valid since long ago, the
 769                point is still up-to-date and the comment still has its value
 770                even if only as a historical artifact.  --mj, July 1998 */
 771             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 772             if (!vc)
 773                 return -ENOMEM;
 774             vc_cons[currcons].d = vc;
 775             tty_port_init(&vc->port);
 776             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 777             visual_init(vc, currcons, 1);
 778             if (!*vc->vc_uni_pagedir_loc)
 779                 con_set_default_unimap(vc);
 780             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 781             if (!vc->vc_screenbuf) {
 782                 kfree(vc);
 783                 vc_cons[currcons].d = NULL;
 784                 return -ENOMEM;
 785             }
 786
 787             /* If no drivers have overridden us and the user didn't pass a
 788                boot option, default to displaying the cursor */
 789             if (global_cursor_default == -1)
 790                     global_cursor_default = 1;
 791
 792             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 793             vcs_make_sysfs(currcons);
 794             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 795         }
 796         return 0;
 797 }
 798
 799 static inline int resize_screen(struct vc_data *vc, int width, int height,
 800                                 int user)
 801 {
 802         /* Resizes the resolution of the display adapater */
 803         int err = 0;
 804
 805         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 806                 err = vc->vc_sw->con_resize(vc, width, height, user);
 807
 808         return err;
 809 }
 810
 811 /*
 812  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 813  * [this is to be used together with some user program
 814  * like resize that changes the hardware videomode]
 815  */
 816 #define VC_RESIZE_MAXCOL (32767)
 817 #define VC_RESIZE_MAXROW (32767)
 818
 819 /**
 820  *      vc_do_resize    -       resizing method for the tty
 821  *      @tty: tty being resized
 822  *      @real_tty: real tty (different to tty if a pty/tty pair)
 823  *      @vc: virtual console private data
 824  *      @cols: columns
 825  *      @lines: lines
 826  *
 827  *      Resize a virtual console, clipping according to the actual constraints.
 828  *      If the caller passes a tty structure then update the termios winsize
 829  *      information and perform any necessary signal handling.
 830  *
 831  *      Caller must hold the console semaphore. Takes the termios rwsem and
 832  *      ctrl_lock of the tty IFF a tty is passed.
 833  */
 834
 835 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 836                                 unsigned int cols, unsigned int lines)
 837 {
 838         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 839         unsigned long end;
 840         unsigned int old_rows, old_row_size;
 841         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 842         unsigned int user;
 843         unsigned short *newscreen;
 844
 845         WARN_CONSOLE_UNLOCKED();
 846
 847         if (!vc)
 848                 return -ENXIO;
 849
 850         user = vc->vc_resize_user;
 851         vc->vc_resize_user = 0;
 852
 853         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 854                 return -EINVAL;
 855
 856         new_cols = (cols ? cols : vc->vc_cols);
 857         new_rows = (lines ? lines : vc->vc_rows);
 858         new_row_size = new_cols << 1;
 859         new_screen_size = new_row_size * new_rows;
 860
 861         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 862                 return 0;
 863
 864         newscreen = kmalloc(new_screen_size, GFP_USER);
 865         if (!newscreen)
 866                 return -ENOMEM;
 867
 868         old_rows = vc->vc_rows;
 869         old_row_size = vc->vc_size_row;
 870
 871         err = resize_screen(vc, new_cols, new_rows, user);
 872         if (err) {
 873                 kfree(newscreen);
 874                 return err;
 875         }
 876
 877         vc->vc_rows = new_rows;
 878         vc->vc_cols = new_cols;
 879         vc->vc_size_row = new_row_size;
 880         vc->vc_screenbuf_size = new_screen_size;
 881
 882         rlth = min(old_row_size, new_row_size);
 883         rrem = new_row_size - rlth;
 884         old_origin = vc->vc_origin;
 885         new_origin = (long) newscreen;
 886         new_scr_end = new_origin + new_screen_size;
 887
 888         if (vc->vc_y > new_rows) {
 889                 if (old_rows - vc->vc_y < new_rows) {
 890                         /*
 891                          * Cursor near the bottom, copy contents from the
 892                          * bottom of buffer
 893                          */
 894                         old_origin += (old_rows - new_rows) * old_row_size;
 895                 } else {
 896                         /*
 897                          * Cursor is in no man's land, copy 1/2 screenful
 898                          * from the top and bottom of cursor position
 899                          */
 900                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 901                 }
 902         }
 903
 904         end = old_origin + old_row_size * min(old_rows, new_rows);
 905
 906         update_attr(vc);
 907
 908         while (old_origin < end) {
 909                 scr_memcpyw((unsigned short *) new_origin,
 910                             (unsigned short *) old_origin, rlth);
 911                 if (rrem)
 912                         scr_memsetw((void *)(new_origin + rlth),
 913                                     vc->vc_video_erase_char, rrem);
 914                 old_origin += old_row_size;
 915                 new_origin += new_row_size;
 916         }
 917         if (new_scr_end > new_origin)
 918                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 919                             new_scr_end - new_origin);
 920         kfree(vc->vc_screenbuf);
 921         vc->vc_screenbuf = newscreen;
 922         vc->vc_screenbuf_size = new_screen_size;
 923         set_origin(vc);
 924
 925         /* do part of a reset_terminal() */
 926         vc->vc_top = 0;
 927         vc->vc_bottom = vc->vc_rows;
 928         gotoxy(vc, vc->vc_x, vc->vc_y);
 929         save_cur(vc);
 930
 931         if (tty) {
 932                 /* Rewrite the requested winsize data with the actual
 933                    resulting sizes */
 934                 struct winsize ws;
 935                 memset(&ws, 0, sizeof(ws));
 936                 ws.ws_row = vc->vc_rows;
 937                 ws.ws_col = vc->vc_cols;
 938                 ws.ws_ypixel = vc->vc_scan_lines;
 939                 tty_do_resize(tty, &ws);
 940         }
 941
 942         if (CON_IS_VISIBLE(vc))
 943                 update_screen(vc);
 944         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 945         return err;
 946 }
 947
 948 /**
 949  *      vc_resize               -       resize a VT
 950  *      @vc: virtual console
 951  *      @cols: columns
 952  *      @rows: rows
 953  *
 954  *      Resize a virtual console as seen from the console end of things. We
 955  *      use the common vc_do_resize methods to update the structures. The
 956  *      caller must hold the console sem to protect console internals and
 957  *      vc->port.tty
 958  */
 959
 960 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 961 {
 962         return vc_do_resize(vc->port.tty, vc, cols, rows);
 963 }
 964
 965 /**
 966  *      vt_resize               -       resize a VT
 967  *      @tty: tty to resize
 968  *      @ws: winsize attributes
 969  *
 970  *      Resize a virtual terminal. This is called by the tty layer as we
 971  *      register our own handler for resizing. The mutual helper does all
 972  *      the actual work.
 973  *
 974  *      Takes the console sem and the called methods then take the tty
 975  *      termios_rwsem and the tty ctrl_lock in that order.
 976  */
 977 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 978 {
 979         struct vc_data *vc = tty->driver_data;
 980         int ret;
 981
 982         console_lock();
 983         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 984         console_unlock();
 985         return ret;
 986 }
 987
 988 struct vc_data *vc_deallocate(unsigned int currcons)
 989 {
 990         struct vc_data *vc = NULL;
 991
 992         WARN_CONSOLE_UNLOCKED();
 993
 994         if (vc_cons_allocated(currcons)) {
 995                 struct vt_notifier_param param;
 996
 997                 param.vc = vc = vc_cons[currcons].d;
 998                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 999                 vcs_remove_sysfs(currcons);
1000                 vc->vc_sw->con_deinit(vc);
1001                 put_pid(vc->vt_pid);
1002                 module_put(vc->vc_sw->owner);
1003                 kfree(vc->vc_screenbuf);
1004                 vc_cons[currcons].d = NULL;
1005         }
1006         return vc;
1007 }
1008
1009 /*
1010  *      VT102 emulator
1011  */
1012
1013 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1014 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1015 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1016
1017 #define decarm          VC_REPEAT
1018 #define decckm          VC_CKMODE
1019 #define kbdapplic       VC_APPLIC
1020 #define lnm             VC_CRLF
1021
1022 /*
1023  * this is what the terminal answers to a ESC-Z or csi0c query.
1024  */
1025 #define VT100ID "\033[?1;2c"
1026 #define VT102ID "\033[?6c"
1027
1028 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1029                                        8,12,10,14, 9,13,11,15 };
1030
1031 /* the default colour table, for VGA+ colour systems */
1032 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1033     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1034 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1035     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1036 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1037     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1038
1039 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1040 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1041 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1042
1043 /*
1044  * gotoxy() must verify all boundaries, because the arguments
1045  * might also be negative. If the given position is out of
1046  * bounds, the cursor is placed at the nearest margin.
1047  */
1048 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1049 {
1050         int min_y, max_y;
1051
1052         if (new_x < 0)
1053                 vc->vc_x = 0;
1054         else {
1055                 if (new_x >= vc->vc_cols)
1056                         vc->vc_x = vc->vc_cols - 1;
1057                 else
1058                         vc->vc_x = new_x;
1059         }
1060
1061         if (vc->vc_decom) {
1062                 min_y = vc->vc_top;
1063                 max_y = vc->vc_bottom;
1064         } else {
1065                 min_y = 0;
1066                 max_y = vc->vc_rows;
1067         }
1068         if (new_y < min_y)
1069                 vc->vc_y = min_y;
1070         else if (new_y >= max_y)
1071                 vc->vc_y = max_y - 1;
1072         else
1073                 vc->vc_y = new_y;
1074         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1075         vc->vc_need_wrap = 0;
1076 }
1077
1078 /* for absolute user moves, when decom is set */
1079 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1080 {
1081         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1082 }
1083
1084 void scrollback(struct vc_data *vc, int lines)
1085 {
1086         if (!lines)
1087                 lines = vc->vc_rows / 2;
1088         scrolldelta(-lines);
1089 }
1090
1091 void scrollfront(struct vc_data *vc, int lines)
1092 {
1093         if (!lines)
1094                 lines = vc->vc_rows / 2;
1095         scrolldelta(lines);
1096 }
1097
1098 static void lf(struct vc_data *vc)
1099 {
1100         /* don't scroll if above bottom of scrolling region, or
1101          * if below scrolling region
1102          */
1103         if (vc->vc_y + 1 == vc->vc_bottom)
1104                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1105         else if (vc->vc_y < vc->vc_rows - 1) {
1106                 vc->vc_y++;
1107                 vc->vc_pos += vc->vc_size_row;
1108         }
1109         vc->vc_need_wrap = 0;
1110         notify_write(vc, '\n');
1111 }
1112
1113 static void ri(struct vc_data *vc)
1114 {
1115         /* don't scroll if below top of scrolling region, or
1116          * if above scrolling region
1117          */
1118         if (vc->vc_y == vc->vc_top)
1119                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1120         else if (vc->vc_y > 0) {
1121                 vc->vc_y--;
1122                 vc->vc_pos -= vc->vc_size_row;
1123         }
1124         vc->vc_need_wrap = 0;
1125 }
1126
1127 static inline void cr(struct vc_data *vc)
1128 {
1129         vc->vc_pos -= vc->vc_x << 1;
1130         vc->vc_need_wrap = vc->vc_x = 0;
1131         notify_write(vc, '\r');
1132 }
1133
1134 static inline void bs(struct vc_data *vc)
1135 {
1136         if (vc->vc_x) {
1137                 vc->vc_pos -= 2;
1138                 vc->vc_x--;
1139                 vc->vc_need_wrap = 0;
1140                 notify_write(vc, '\b');
1141         }
1142 }
1143
1144 static inline void del(struct vc_data *vc)
1145 {
1146         /* ignored */
1147 }
1148
1149 static void csi_J(struct vc_data *vc, int vpar)
1150 {
1151         unsigned int count;
1152         unsigned short * start;
1153
1154         switch (vpar) {
1155                 case 0: /* erase from cursor to end of display */
1156                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1157                         start = (unsigned short *)vc->vc_pos;
1158                         break;
1159                 case 1: /* erase from start to cursor */
1160                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1161                         start = (unsigned short *)vc->vc_origin;
1162                         break;
1163                 case 3: /* erase scroll-back buffer (and whole display) */
1164                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1165                                     vc->vc_screenbuf_size >> 1);
1166                         set_origin(vc);
1167                         if (CON_IS_VISIBLE(vc))
1168                                 update_screen(vc);
1169                         /* fall through */
1170                 case 2: /* erase whole display */
1171                         count = vc->vc_cols * vc->vc_rows;
1172                         start = (unsigned short *)vc->vc_origin;
1173                         break;
1174                 default:
1175                         return;
1176         }
1177         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1178         if (DO_UPDATE(vc))
1179                 do_update_region(vc, (unsigned long) start, count);
1180         vc->vc_need_wrap = 0;
1181 }
1182
1183 static void csi_K(struct vc_data *vc, int vpar)
1184 {
1185         unsigned int count;
1186         unsigned short * start;
1187
1188         switch (vpar) {
1189                 case 0: /* erase from cursor to end of line */
1190                         count = vc->vc_cols - vc->vc_x;
1191                         start = (unsigned short *)vc->vc_pos;
1192                         break;
1193                 case 1: /* erase from start of line to cursor */
1194                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1195                         count = vc->vc_x + 1;
1196                         break;
1197                 case 2: /* erase whole line */
1198                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1199                         count = vc->vc_cols;
1200                         break;
1201                 default:
1202                         return;
1203         }
1204         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1205         vc->vc_need_wrap = 0;
1206         if (DO_UPDATE(vc))
1207                 do_update_region(vc, (unsigned long) start, count);
1208 }
1209
1210 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1211 {                                         /* not vt100? */
1212         int count;
1213
1214         if (!vpar)
1215                 vpar++;
1216         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1217
1218         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1219         if (DO_UPDATE(vc))
1220                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1221         vc->vc_need_wrap = 0;
1222 }
1223
1224 static void default_attr(struct vc_data *vc)
1225 {
1226         vc->vc_intensity = 1;
1227         vc->vc_italic = 0;
1228         vc->vc_underline = 0;
1229         vc->vc_reverse = 0;
1230         vc->vc_blink = 0;
1231         vc->vc_color = vc->vc_def_color;
1232 }
1233
1234 struct rgb { u8 r; u8 g; u8 b; };
1235
1236 struct rgb rgb_from_256(int i)
1237 {
1238         struct rgb c;
1239         if (i < 8) {            /* Standard colours. */
1240                 c.r = i&1 ? 0xaa : 0x00;
1241                 c.g = i&2 ? 0xaa : 0x00;
1242                 c.b = i&4 ? 0xaa : 0x00;
1243         } else if (i < 16) {
1244                 c.r = i&1 ? 0xff : 0x55;
1245                 c.g = i&2 ? 0xff : 0x55;
1246                 c.b = i&4 ? 0xff : 0x55;
1247         } else if (i < 232) {   /* 6x6x6 colour cube. */
1248                 c.r = (i - 16) / 36 * 85 / 2;
1249                 c.g = (i - 16) / 6 % 6 * 85 / 2;
1250                 c.b = (i - 16) % 6 * 85 / 2;
1251         } else                  /* Grayscale ramp. */
1252                 c.r = c.g = c.b = i * 10 - 2312;
1253         return c;
1254 }
1255
1256 static void rgb_foreground(struct vc_data *vc, struct rgb c)
1257 {
1258         u8 hue, max = c.r;
1259         if (c.g > max)
1260                 max = c.g;
1261         if (c.b > max)
1262                 max = c.b;
1263         hue = (c.r > max/2 ? 4 : 0)
1264             | (c.g > max/2 ? 2 : 0)
1265             | (c.b > max/2 ? 1 : 0);
1266         if (hue == 7 && max <= 0x55)
1267                 hue = 0, vc->vc_intensity = 2;
1268         else
1269                 vc->vc_intensity = (max > 0xaa) + 1;
1270         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1271 }
1272
1273 static void rgb_background(struct vc_data *vc, struct rgb c)
1274 {
1275         /* For backgrounds, err on the dark side. */
1276         vc->vc_color = (vc->vc_color & 0x0f)
1277                 | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1278 }
1279
1280 /* console_lock is held */
1281 static void csi_m(struct vc_data *vc)
1282 {
1283         int i;
1284
1285         for (i = 0; i <= vc->vc_npar; i++)
1286                 switch (vc->vc_par[i]) {
1287                         case 0: /* all attributes off */
1288                                 default_attr(vc);
1289                                 break;
1290                         case 1:
1291                                 vc->vc_intensity = 2;
1292                                 break;
1293                         case 2:
1294                                 vc->vc_intensity = 0;
1295                                 break;
1296                         case 3:
1297                                 vc->vc_italic = 1;
1298                                 break;
1299                         case 4:
1300                                 vc->vc_underline = 1;
1301                                 break;
1302                         case 5:
1303                                 vc->vc_blink = 1;
1304                                 break;
1305                         case 7:
1306                                 vc->vc_reverse = 1;
1307                                 break;
1308                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1309                                   * Select primary font, don't display
1310                                   * control chars if defined, don't set
1311                                   * bit 8 on output.
1312                                   */
1313                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1314                                                 ? vc->vc_G0_charset
1315                                                 : vc->vc_G1_charset, vc);
1316                                 vc->vc_disp_ctrl = 0;
1317                                 vc->vc_toggle_meta = 0;
1318                                 break;
1319                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1320                                   * Select first alternate font, lets
1321                                   * chars < 32 be displayed as ROM chars.
1322                                   */
1323                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1324                                 vc->vc_disp_ctrl = 1;
1325                                 vc->vc_toggle_meta = 0;
1326                                 break;
1327                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1328                                   * Select second alternate font, toggle
1329                                   * high bit before displaying as ROM char.
1330                                   */
1331                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1332                                 vc->vc_disp_ctrl = 1;
1333                                 vc->vc_toggle_meta = 1;
1334                                 break;
1335                         case 21:
1336                         case 22:
1337                                 vc->vc_intensity = 1;
1338                                 break;
1339                         case 23:
1340                                 vc->vc_italic = 0;
1341                                 break;
1342                         case 24:
1343                                 vc->vc_underline = 0;
1344                                 break;
1345                         case 25:
1346                                 vc->vc_blink = 0;
1347                                 break;
1348                         case 27:
1349                                 vc->vc_reverse = 0;
1350                                 break;
1351                         case 38: /* ITU T.416
1352                                   * Higher colour modes.
1353                                   * They break the usual properties of SGR codes
1354                                   * and thus need to be detected and ignored by
1355                                   * hand.  Strictly speaking, that standard also
1356                                   * wants : rather than ; as separators, contrary
1357                                   * to ECMA-48, but no one produces such codes
1358                                   * and almost no one accepts them.
1359                                   */
1360                                 i++;
1361                                 if (i > vc->vc_npar)
1362                                         break;
1363                                 if (vc->vc_par[i] == 5 &&  /* 256 colours */
1364                                     i < vc->vc_npar) {     /* ubiquitous */
1365                                         i++;
1366                                         rgb_foreground(vc,
1367                                                 rgb_from_256(vc->vc_par[i]));
1368                                 } else if (vc->vc_par[i] == 2 &&  /* 24 bit */
1369                                            i <= vc->vc_npar + 3) {/* extremely rare */
1370                                         struct rgb c = {r:vc->vc_par[i+1],
1371                                                         g:vc->vc_par[i+2],
1372                                                         b:vc->vc_par[i+3]};
1373                                         rgb_foreground(vc, c);
1374                                         i += 3;
1375                                 }
1376                                 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1377                                  * there's no point in supporting them.
1378                                  */
1379                                 break;
1380                         case 48:
1381                                 i++;
1382                                 if (i > vc->vc_npar)
1383                                         break;
1384                                 if (vc->vc_par[i] == 5 &&  /* 256 colours */
1385                                     i < vc->vc_npar) {
1386                                         i++;
1387                                         rgb_background(vc,
1388                                                 rgb_from_256(vc->vc_par[i]));
1389                                 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1390                                            i <= vc->vc_npar + 3) {
1391                                         struct rgb c = {r:vc->vc_par[i+1],
1392                                                         g:vc->vc_par[i+2],
1393                                                         b:vc->vc_par[i+3]};
1394                                         rgb_background(vc, c);
1395                                         i += 3;
1396                                 }
1397                                 break;
1398                         case 39:
1399                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1400                                 break;
1401                         case 49:
1402                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1403                                 break;
1404                         default:
1405                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1406                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1407                                                 | (vc->vc_color & 0xf0);
1408                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1409                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1410                                                 | (vc->vc_color & 0x0f);
1411                                 break;
1412                 }
1413         update_attr(vc);
1414 }
1415
1416 static void respond_string(const char *p, struct tty_port *port)
1417 {
1418         while (*p) {
1419                 tty_insert_flip_char(port, *p, 0);
1420                 p++;
1421         }
1422         tty_schedule_flip(port);
1423 }
1424
1425 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1426 {
1427         char buf[40];
1428
1429         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1430         respond_string(buf, tty->port);
1431 }
1432
1433 static inline void status_report(struct tty_struct *tty)
1434 {
1435         respond_string("\033[0n", tty->port);   /* Terminal ok */
1436 }
1437
1438 static inline void respond_ID(struct tty_struct *tty)
1439 {
1440         respond_string(VT102ID, tty->port);
1441 }
1442
1443 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1444 {
1445         char buf[8];
1446
1447         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1448                 (char)('!' + mry));
1449         respond_string(buf, tty->port);
1450 }
1451
1452 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1453 int mouse_reporting(void)
1454 {
1455         return vc_cons[fg_console].d->vc_report_mouse;
1456 }
1457
1458 /* console_lock is held */
1459 static void set_mode(struct vc_data *vc, int on_off)
1460 {
1461         int i;
1462
1463         for (i = 0; i <= vc->vc_npar; i++)
1464                 if (vc->vc_ques) {
1465                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1466                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1467                                 if (on_off)
1468                                         set_kbd(vc, decckm);
1469                                 else
1470                                         clr_kbd(vc, decckm);
1471                                 break;
1472                         case 3: /* 80/132 mode switch unimplemented */
1473                                 vc->vc_deccolm = on_off;
1474 #if 0
1475                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1476                                 /* this alone does not suffice; some user mode
1477                                    utility has to change the hardware regs */
1478 #endif
1479                                 break;
1480                         case 5:                 /* Inverted screen on/off */
1481                                 if (vc->vc_decscnm != on_off) {
1482                                         vc->vc_decscnm = on_off;
1483                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1484                                         update_attr(vc);
1485                                 }
1486                                 break;
1487                         case 6:                 /* Origin relative/absolute */
1488                                 vc->vc_decom = on_off;
1489                                 gotoxay(vc, 0, 0);
1490                                 break;
1491                         case 7:                 /* Autowrap on/off */
1492                                 vc->vc_decawm = on_off;
1493                                 break;
1494                         case 8:                 /* Autorepeat on/off */
1495                                 if (on_off)
1496                                         set_kbd(vc, decarm);
1497                                 else
1498                                         clr_kbd(vc, decarm);
1499                                 break;
1500                         case 9:
1501                                 vc->vc_report_mouse = on_off ? 1 : 0;
1502                                 break;
1503                         case 25:                /* Cursor on/off */
1504                                 vc->vc_deccm = on_off;
1505                                 break;
1506                         case 1000:
1507                                 vc->vc_report_mouse = on_off ? 2 : 0;
1508                                 break;
1509                         }
1510                 } else {
1511                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1512                         case 3:                 /* Monitor (display ctrls) */
1513                                 vc->vc_disp_ctrl = on_off;
1514                                 break;
1515                         case 4:                 /* Insert Mode on/off */
1516                                 vc->vc_decim = on_off;
1517                                 break;
1518                         case 20:                /* Lf, Enter == CrLf/Lf */
1519                                 if (on_off)
1520                                         set_kbd(vc, lnm);
1521                                 else
1522                                         clr_kbd(vc, lnm);
1523                                 break;
1524                         }
1525                 }
1526 }
1527
1528 /* console_lock is held */
1529 static void setterm_command(struct vc_data *vc)
1530 {
1531         switch(vc->vc_par[0]) {
1532                 case 1: /* set color for underline mode */
1533                         if (vc->vc_can_do_color &&
1534                                         vc->vc_par[1] < 16) {
1535                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1536                                 if (vc->vc_underline)
1537                                         update_attr(vc);
1538                         }
1539                         break;
1540                 case 2: /* set color for half intensity mode */
1541                         if (vc->vc_can_do_color &&
1542                                         vc->vc_par[1] < 16) {
1543                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1544                                 if (vc->vc_intensity == 0)
1545                                         update_attr(vc);
1546                         }
1547                         break;
1548                 case 8: /* store colors as defaults */
1549                         vc->vc_def_color = vc->vc_attr;
1550                         if (vc->vc_hi_font_mask == 0x100)
1551                                 vc->vc_def_color >>= 1;
1552                         default_attr(vc);
1553                         update_attr(vc);
1554                         break;
1555                 case 9: /* set blanking interval */
1556                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1557                         poke_blanked_console();
1558                         break;
1559                 case 10: /* set bell frequency in Hz */
1560                         if (vc->vc_npar >= 1)
1561                                 vc->vc_bell_pitch = vc->vc_par[1];
1562                         else
1563                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1564                         break;
1565                 case 11: /* set bell duration in msec */
1566                         if (vc->vc_npar >= 1)
1567                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1568                                         vc->vc_par[1] * HZ / 1000 : 0;
1569                         else
1570                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1571                         break;
1572                 case 12: /* bring specified console to the front */
1573                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1574                                 set_console(vc->vc_par[1] - 1);
1575                         break;
1576                 case 13: /* unblank the screen */
1577                         poke_blanked_console();
1578                         break;
1579                 case 14: /* set vesa powerdown interval */
1580                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1581                         break;
1582                 case 15: /* activate the previous console */
1583                         set_console(last_console);
1584                         break;
1585         }
1586 }
1587
1588 /* console_lock is held */
1589 static void csi_at(struct vc_data *vc, unsigned int nr)
1590 {
1591         if (nr > vc->vc_cols - vc->vc_x)
1592                 nr = vc->vc_cols - vc->vc_x;
1593         else if (!nr)
1594                 nr = 1;
1595         insert_char(vc, nr);
1596 }
1597
1598 /* console_lock is held */
1599 static void csi_L(struct vc_data *vc, unsigned int nr)
1600 {
1601         if (nr > vc->vc_rows - vc->vc_y)
1602                 nr = vc->vc_rows - vc->vc_y;
1603         else if (!nr)
1604                 nr = 1;
1605         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1606         vc->vc_need_wrap = 0;
1607 }
1608
1609 /* console_lock is held */
1610 static void csi_P(struct vc_data *vc, unsigned int nr)
1611 {
1612         if (nr > vc->vc_cols - vc->vc_x)
1613                 nr = vc->vc_cols - vc->vc_x;
1614         else if (!nr)
1615                 nr = 1;
1616         delete_char(vc, nr);
1617 }
1618
1619 /* console_lock is held */
1620 static void csi_M(struct vc_data *vc, unsigned int nr)
1621 {
1622         if (nr > vc->vc_rows - vc->vc_y)
1623                 nr = vc->vc_rows - vc->vc_y;
1624         else if (!nr)
1625                 nr=1;
1626         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1627         vc->vc_need_wrap = 0;
1628 }
1629
1630 /* console_lock is held (except via vc_init->reset_terminal */
1631 static void save_cur(struct vc_data *vc)
1632 {
1633         vc->vc_saved_x          = vc->vc_x;
1634         vc->vc_saved_y          = vc->vc_y;
1635         vc->vc_s_intensity      = vc->vc_intensity;
1636         vc->vc_s_italic         = vc->vc_italic;
1637         vc->vc_s_underline      = vc->vc_underline;
1638         vc->vc_s_blink          = vc->vc_blink;
1639         vc->vc_s_reverse        = vc->vc_reverse;
1640         vc->vc_s_charset        = vc->vc_charset;
1641         vc->vc_s_color          = vc->vc_color;
1642         vc->vc_saved_G0         = vc->vc_G0_charset;
1643         vc->vc_saved_G1         = vc->vc_G1_charset;
1644 }
1645
1646 /* console_lock is held */
1647 static void restore_cur(struct vc_data *vc)
1648 {
1649         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1650         vc->vc_intensity        = vc->vc_s_intensity;
1651         vc->vc_italic           = vc->vc_s_italic;
1652         vc->vc_underline        = vc->vc_s_underline;
1653         vc->vc_blink            = vc->vc_s_blink;
1654         vc->vc_reverse          = vc->vc_s_reverse;
1655         vc->vc_charset          = vc->vc_s_charset;
1656         vc->vc_color            = vc->vc_s_color;
1657         vc->vc_G0_charset       = vc->vc_saved_G0;
1658         vc->vc_G1_charset       = vc->vc_saved_G1;
1659         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1660         update_attr(vc);
1661         vc->vc_need_wrap = 0;
1662 }
1663
1664 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1665         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1666         ESpalette, ESosc };
1667
1668 /* console_lock is held (except via vc_init()) */
1669 static void reset_terminal(struct vc_data *vc, int do_clear)
1670 {
1671         vc->vc_top              = 0;
1672         vc->vc_bottom           = vc->vc_rows;
1673         vc->vc_state            = ESnormal;
1674         vc->vc_ques             = 0;
1675         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1676         vc->vc_G0_charset       = LAT1_MAP;
1677         vc->vc_G1_charset       = GRAF_MAP;
1678         vc->vc_charset          = 0;
1679         vc->vc_need_wrap        = 0;
1680         vc->vc_report_mouse     = 0;
1681         vc->vc_utf              = default_utf8;
1682         vc->vc_utf_count        = 0;
1683
1684         vc->vc_disp_ctrl        = 0;
1685         vc->vc_toggle_meta      = 0;
1686
1687         vc->vc_decscnm          = 0;
1688         vc->vc_decom            = 0;
1689         vc->vc_decawm           = 1;
1690         vc->vc_deccm            = global_cursor_default;
1691         vc->vc_decim            = 0;
1692
1693         vt_reset_keyboard(vc->vc_num);
1694
1695         vc->vc_cursor_type = cur_default;
1696         vc->vc_complement_mask = vc->vc_s_complement_mask;
1697
1698         default_attr(vc);
1699         update_attr(vc);
1700
1701         vc->vc_tab_stop[0]      = 0x01010100;
1702         vc->vc_tab_stop[1]      =
1703         vc->vc_tab_stop[2]      =
1704         vc->vc_tab_stop[3]      =
1705         vc->vc_tab_stop[4]      =
1706         vc->vc_tab_stop[5]      =
1707         vc->vc_tab_stop[6]      =
1708         vc->vc_tab_stop[7]      = 0x01010101;
1709
1710         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1711         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1712
1713         gotoxy(vc, 0, 0);
1714         save_cur(vc);
1715         if (do_clear)
1716             csi_J(vc, 2);
1717 }
1718
1719 /* console_lock is held */
1720 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1721 {
1722         /*
1723          *  Control characters can be used in the _middle_
1724          *  of an escape sequence.
1725          */
1726         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1727                 return;
1728         switch (c) {
1729         case 0:
1730                 return;
1731         case 7:
1732                 if (vc->vc_state == ESosc)
1733                         vc->vc_state = ESnormal;
1734                 else if (vc->vc_bell_duration)
1735                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1736                 return;
1737         case 8:
1738                 bs(vc);
1739                 return;
1740         case 9:
1741                 vc->vc_pos -= (vc->vc_x << 1);
1742                 while (vc->vc_x < vc->vc_cols - 1) {
1743                         vc->vc_x++;
1744                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1745                                 break;
1746                 }
1747                 vc->vc_pos += (vc->vc_x << 1);
1748                 notify_write(vc, '\t');
1749                 return;
1750         case 10: case 11: case 12:
1751                 lf(vc);
1752                 if (!is_kbd(vc, lnm))
1753                         return;
1754         case 13:
1755                 cr(vc);
1756                 return;
1757         case 14:
1758                 vc->vc_charset = 1;
1759                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1760                 vc->vc_disp_ctrl = 1;
1761                 return;
1762         case 15:
1763                 vc->vc_charset = 0;
1764                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1765                 vc->vc_disp_ctrl = 0;
1766                 return;
1767         case 24: case 26:
1768                 vc->vc_state = ESnormal;
1769                 return;
1770         case 27:
1771                 vc->vc_state = ESesc;
1772                 return;
1773         case 127:
1774                 del(vc);
1775                 return;
1776         case 128+27:
1777                 vc->vc_state = ESsquare;
1778                 return;
1779         }
1780         switch(vc->vc_state) {
1781         case ESesc:
1782                 vc->vc_state = ESnormal;
1783                 switch (c) {
1784                 case '[':
1785                         vc->vc_state = ESsquare;
1786                         return;
1787                 case ']':
1788                         vc->vc_state = ESnonstd;
1789                         return;
1790                 case '%':
1791                         vc->vc_state = ESpercent;
1792                         return;
1793                 case 'E':
1794                         cr(vc);
1795                         lf(vc);
1796                         return;
1797                 case 'M':
1798                         ri(vc);
1799                         return;
1800                 case 'D':
1801                         lf(vc);
1802                         return;
1803                 case 'H':
1804                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1805                         return;
1806                 case 'Z':
1807                         respond_ID(tty);
1808                         return;
1809                 case '7':
1810                         save_cur(vc);
1811                         return;
1812                 case '8':
1813                         restore_cur(vc);
1814                         return;
1815                 case '(':
1816                         vc->vc_state = ESsetG0;
1817                         return;
1818                 case ')':
1819                         vc->vc_state = ESsetG1;
1820                         return;
1821                 case '#':
1822                         vc->vc_state = EShash;
1823                         return;
1824                 case 'c':
1825                         reset_terminal(vc, 1);
1826                         return;
1827                 case '>':  /* Numeric keypad */
1828                         clr_kbd(vc, kbdapplic);
1829                         return;
1830                 case '=':  /* Appl. keypad */
1831                         set_kbd(vc, kbdapplic);
1832                         return;
1833                 }
1834                 return;
1835         case ESnonstd:
1836                 if (c=='P') {   /* palette escape sequence */
1837                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1838                                 vc->vc_par[vc->vc_npar] = 0;
1839                         vc->vc_npar = 0;
1840                         vc->vc_state = ESpalette;
1841                         return;
1842                 } else if (c=='R') {   /* reset palette */
1843                         reset_palette(vc);
1844                         vc->vc_state = ESnormal;
1845                 } else if (c>='0' && c<='9')
1846                         vc->vc_state = ESosc;
1847                 else
1848                         vc->vc_state = ESnormal;
1849                 return;
1850         case ESpalette:
1851                 if (isxdigit(c)) {
1852                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1853                         if (vc->vc_npar == 7) {
1854                                 int i = vc->vc_par[0] * 3, j = 1;
1855                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1856                                 vc->vc_palette[i++] += vc->vc_par[j++];
1857                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1858                                 vc->vc_palette[i++] += vc->vc_par[j++];
1859                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1860                                 vc->vc_palette[i] += vc->vc_par[j];
1861                                 set_palette(vc);
1862                                 vc->vc_state = ESnormal;
1863                         }
1864                 } else
1865                         vc->vc_state = ESnormal;
1866                 return;
1867         case ESsquare:
1868                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1869                         vc->vc_par[vc->vc_npar] = 0;
1870                 vc->vc_npar = 0;
1871                 vc->vc_state = ESgetpars;
1872                 if (c == '[') { /* Function key */
1873                         vc->vc_state=ESfunckey;
1874                         return;
1875                 }
1876                 vc->vc_ques = (c == '?');
1877                 if (vc->vc_ques)
1878                         return;
1879         case ESgetpars:
1880                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1881                         vc->vc_npar++;
1882                         return;
1883                 } else if (c>='0' && c<='9') {
1884                         vc->vc_par[vc->vc_npar] *= 10;
1885                         vc->vc_par[vc->vc_npar] += c - '0';
1886                         return;
1887                 }
1888                 vc->vc_state = ESnormal;
1889                 switch(c) {
1890                 case 'h':
1891                         set_mode(vc, 1);
1892                         return;
1893                 case 'l':
1894                         set_mode(vc, 0);
1895                         return;
1896                 case 'c':
1897                         if (vc->vc_ques) {
1898                                 if (vc->vc_par[0])
1899                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1900                                 else
1901                                         vc->vc_cursor_type = cur_default;
1902                                 return;
1903                         }
1904                         break;
1905                 case 'm':
1906                         if (vc->vc_ques) {
1907                                 clear_selection();
1908                                 if (vc->vc_par[0])
1909                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1910                                 else
1911                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1912                                 return;
1913                         }
1914                         break;
1915                 case 'n':
1916                         if (!vc->vc_ques) {
1917                                 if (vc->vc_par[0] == 5)
1918                                         status_report(tty);
1919                                 else if (vc->vc_par[0] == 6)
1920                                         cursor_report(vc, tty);
1921                         }
1922                         return;
1923                 }
1924                 if (vc->vc_ques) {
1925                         vc->vc_ques = 0;
1926                         return;
1927                 }
1928                 switch(c) {
1929                 case 'G': case '`':
1930                         if (vc->vc_par[0])
1931                                 vc->vc_par[0]--;
1932                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1933                         return;
1934                 case 'A':
1935                         if (!vc->vc_par[0])
1936                                 vc->vc_par[0]++;
1937                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1938                         return;
1939                 case 'B': case 'e':
1940                         if (!vc->vc_par[0])
1941                                 vc->vc_par[0]++;
1942                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1943                         return;
1944                 case 'C': case 'a':
1945                         if (!vc->vc_par[0])
1946                                 vc->vc_par[0]++;
1947                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1948                         return;
1949                 case 'D':
1950                         if (!vc->vc_par[0])
1951                                 vc->vc_par[0]++;
1952                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1953                         return;
1954                 case 'E':
1955                         if (!vc->vc_par[0])
1956                                 vc->vc_par[0]++;
1957                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1958                         return;
1959                 case 'F':
1960                         if (!vc->vc_par[0])
1961                                 vc->vc_par[0]++;
1962                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1963                         return;
1964                 case 'd':
1965                         if (vc->vc_par[0])
1966                                 vc->vc_par[0]--;
1967                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1968                         return;
1969                 case 'H': case 'f':
1970                         if (vc->vc_par[0])
1971                                 vc->vc_par[0]--;
1972                         if (vc->vc_par[1])
1973                                 vc->vc_par[1]--;
1974                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1975                         return;
1976                 case 'J':
1977                         csi_J(vc, vc->vc_par[0]);
1978                         return;
1979                 case 'K':
1980                         csi_K(vc, vc->vc_par[0]);
1981                         return;
1982                 case 'L':
1983                         csi_L(vc, vc->vc_par[0]);
1984                         return;
1985                 case 'M':
1986                         csi_M(vc, vc->vc_par[0]);
1987                         return;
1988                 case 'P':
1989                         csi_P(vc, vc->vc_par[0]);
1990                         return;
1991                 case 'c':
1992                         if (!vc->vc_par[0])
1993                                 respond_ID(tty);
1994                         return;
1995                 case 'g':
1996                         if (!vc->vc_par[0])
1997                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1998                         else if (vc->vc_par[0] == 3) {
1999                                 vc->vc_tab_stop[0] =
2000                                         vc->vc_tab_stop[1] =
2001                                         vc->vc_tab_stop[2] =
2002                                         vc->vc_tab_stop[3] =
2003                                         vc->vc_tab_stop[4] =
2004                                         vc->vc_tab_stop[5] =
2005                                         vc->vc_tab_stop[6] =
2006                                         vc->vc_tab_stop[7] = 0;
2007                         }
2008                         return;
2009                 case 'm':
2010                         csi_m(vc);
2011                         return;
2012                 case 'q': /* DECLL - but only 3 leds */
2013                         /* map 0,1,2,3 to 0,1,2,4 */
2014                         if (vc->vc_par[0] < 4)
2015                                 vt_set_led_state(vc->vc_num,
2016                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2017                         return;
2018                 case 'r':
2019                         if (!vc->vc_par[0])
2020                                 vc->vc_par[0]++;
2021                         if (!vc->vc_par[1])
2022                                 vc->vc_par[1] = vc->vc_rows;
2023                         /* Minimum allowed region is 2 lines */
2024                         if (vc->vc_par[0] < vc->vc_par[1] &&
2025                             vc->vc_par[1] <= vc->vc_rows) {
2026                                 vc->vc_top = vc->vc_par[0] - 1;
2027                                 vc->vc_bottom = vc->vc_par[1];
2028                                 gotoxay(vc, 0, 0);
2029                         }
2030                         return;
2031                 case 's':
2032                         save_cur(vc);
2033                         return;
2034                 case 'u':
2035                         restore_cur(vc);
2036                         return;
2037                 case 'X':
2038                         csi_X(vc, vc->vc_par[0]);
2039                         return;
2040                 case '@':
2041                         csi_at(vc, vc->vc_par[0]);
2042                         return;
2043                 case ']': /* setterm functions */
2044                         setterm_command(vc);
2045                         return;
2046                 }
2047                 return;
2048         case ESpercent:
2049                 vc->vc_state = ESnormal;
2050                 switch (c) {
2051                 case '@':  /* defined in ISO 2022 */
2052                         vc->vc_utf = 0;
2053                         return;
2054                 case 'G':  /* prelim official escape code */
2055                 case '8':  /* retained for compatibility */
2056                         vc->vc_utf = 1;
2057                         return;
2058                 }
2059                 return;
2060         case ESfunckey:
2061                 vc->vc_state = ESnormal;
2062                 return;
2063         case EShash:
2064                 vc->vc_state = ESnormal;
2065                 if (c == '8') {
2066                         /* DEC screen alignment test. kludge :-) */
2067                         vc->vc_video_erase_char =
2068                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2069                         csi_J(vc, 2);
2070                         vc->vc_video_erase_char =
2071                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2072                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2073                 }
2074                 return;
2075         case ESsetG0:
2076                 if (c == '0')
2077                         vc->vc_G0_charset = GRAF_MAP;
2078                 else if (c == 'B')
2079                         vc->vc_G0_charset = LAT1_MAP;
2080                 else if (c == 'U')
2081                         vc->vc_G0_charset = IBMPC_MAP;
2082                 else if (c == 'K')
2083                         vc->vc_G0_charset = USER_MAP;
2084                 if (vc->vc_charset == 0)
2085                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2086                 vc->vc_state = ESnormal;
2087                 return;
2088         case ESsetG1:
2089                 if (c == '0')
2090                         vc->vc_G1_charset = GRAF_MAP;
2091                 else if (c == 'B')
2092                         vc->vc_G1_charset = LAT1_MAP;
2093                 else if (c == 'U')
2094                         vc->vc_G1_charset = IBMPC_MAP;
2095                 else if (c == 'K')
2096                         vc->vc_G1_charset = USER_MAP;
2097                 if (vc->vc_charset == 1)
2098                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2099                 vc->vc_state = ESnormal;
2100                 return;
2101         case ESosc:
2102                 return;
2103         default:
2104                 vc->vc_state = ESnormal;
2105         }
2106 }
2107
2108 /* is_double_width() is based on the wcwidth() implementation by
2109  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2110  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2111  */
2112 struct interval {
2113         uint32_t first;
2114         uint32_t last;
2115 };
2116
2117 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2118 {
2119         int min = 0;
2120         int mid;
2121
2122         if (ucs < table[0].first || ucs > table[max].last)
2123                 return 0;
2124         while (max >= min) {
2125                 mid = (min + max) / 2;
2126                 if (ucs > table[mid].last)
2127                         min = mid + 1;
2128                 else if (ucs < table[mid].first)
2129                         max = mid - 1;
2130                 else
2131                         return 1;
2132         }
2133         return 0;
2134 }
2135
2136 static int is_double_width(uint32_t ucs)
2137 {
2138         static const struct interval double_width[] = {
2139                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2140                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2141                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2142                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2143         };
2144         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2145 }
2146
2147 /* acquires console_lock */
2148 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2149 {
2150 #ifdef VT_BUF_VRAM_ONLY
2151 #define FLUSH do { } while(0);
2152 #else
2153 #define FLUSH if (draw_x >= 0) { \
2154         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2155         draw_x = -1; \
2156         }
2157 #endif
2158
2159         int c, tc, ok, n = 0, draw_x = -1;
2160         unsigned int currcons;
2161         unsigned long draw_from = 0, draw_to = 0;
2162         struct vc_data *vc;
2163         unsigned char vc_attr;
2164         struct vt_notifier_param param;
2165         uint8_t rescan;
2166         uint8_t inverse;
2167         uint8_t width;
2168         u16 himask, charmask;
2169
2170         if (in_interrupt())
2171                 return count;
2172
2173         might_sleep();
2174
2175         console_lock();
2176         vc = tty->driver_data;
2177         if (vc == NULL) {
2178                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2179                 console_unlock();
2180                 return 0;
2181         }
2182
2183         currcons = vc->vc_num;
2184         if (!vc_cons_allocated(currcons)) {
2185                 /* could this happen? */
2186                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2187                 console_unlock();
2188                 return 0;
2189         }
2190
2191         himask = vc->vc_hi_font_mask;
2192         charmask = himask ? 0x1ff : 0xff;
2193
2194         /* undraw cursor first */
2195         if (IS_FG(vc))
2196                 hide_cursor(vc);
2197
2198         param.vc = vc;
2199
2200         while (!tty->stopped && count) {
2201                 int orig = *buf;
2202                 c = orig;
2203                 buf++;
2204                 n++;
2205                 count--;
2206                 rescan = 0;
2207                 inverse = 0;
2208                 width = 1;
2209
2210                 /* Do no translation at all in control states */
2211                 if (vc->vc_state != ESnormal) {
2212                         tc = c;
2213                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2214                     /* Combine UTF-8 into Unicode in vc_utf_char.
2215                      * vc_utf_count is the number of continuation bytes still
2216                      * expected to arrive.
2217                      * vc_npar is the number of continuation bytes arrived so
2218                      * far
2219                      */
2220 rescan_last_byte:
2221                     if ((c & 0xc0) == 0x80) {
2222                         /* Continuation byte received */
2223                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2224                         if (vc->vc_utf_count) {
2225                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2226                             vc->vc_npar++;
2227                             if (--vc->vc_utf_count) {
2228                                 /* Still need some bytes */
2229                                 continue;
2230                             }
2231                             /* Got a whole character */
2232                             c = vc->vc_utf_char;
2233                             /* Reject overlong sequences */
2234                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2235                                         c > utf8_length_changes[vc->vc_npar])
2236                                 c = 0xfffd;
2237                         } else {
2238                             /* Unexpected continuation byte */
2239                             vc->vc_utf_count = 0;
2240                             c = 0xfffd;
2241                         }
2242                     } else {
2243                         /* Single ASCII byte or first byte of a sequence received */
2244                         if (vc->vc_utf_count) {
2245                             /* Continuation byte expected */
2246                             rescan = 1;
2247                             vc->vc_utf_count = 0;
2248                             c = 0xfffd;
2249                         } else if (c > 0x7f) {
2250                             /* First byte of a multibyte sequence received */
2251                             vc->vc_npar = 0;
2252                             if ((c & 0xe0) == 0xc0) {
2253                                 vc->vc_utf_count = 1;
2254                                 vc->vc_utf_char = (c & 0x1f);
2255                             } else if ((c & 0xf0) == 0xe0) {
2256                                 vc->vc_utf_count = 2;
2257                                 vc->vc_utf_char = (c & 0x0f);
2258                             } else if ((c & 0xf8) == 0xf0) {
2259                                 vc->vc_utf_count = 3;
2260                                 vc->vc_utf_char = (c & 0x07);
2261                             } else if ((c & 0xfc) == 0xf8) {
2262                                 vc->vc_utf_count = 4;
2263                                 vc->vc_utf_char = (c & 0x03);
2264                             } else if ((c & 0xfe) == 0xfc) {
2265                                 vc->vc_utf_count = 5;
2266                                 vc->vc_utf_char = (c & 0x01);
2267                             } else {
2268                                 /* 254 and 255 are invalid */
2269                                 c = 0xfffd;
2270                             }
2271                             if (vc->vc_utf_count) {
2272                                 /* Still need some bytes */
2273                                 continue;
2274                             }
2275                         }
2276                         /* Nothing to do if an ASCII byte was received */
2277                     }
2278                     /* End of UTF-8 decoding. */
2279                     /* c is the received character, or U+FFFD for invalid sequences. */
2280                     /* Replace invalid Unicode code points with U+FFFD too */
2281                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2282                         c = 0xfffd;
2283                     tc = c;
2284                 } else {        /* no utf or alternate charset mode */
2285                     tc = vc_translate(vc, c);
2286                 }
2287
2288                 param.c = tc;
2289                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2290                                         &param) == NOTIFY_STOP)
2291                         continue;
2292
2293                 /* If the original code was a control character we
2294                  * only allow a glyph to be displayed if the code is
2295                  * not normally used (such as for cursor movement) or
2296                  * if the disp_ctrl mode has been explicitly enabled.
2297                  * Certain characters (as given by the CTRL_ALWAYS
2298                  * bitmap) are always displayed as control characters,
2299                  * as the console would be pretty useless without
2300                  * them; to display an arbitrary font position use the
2301                  * direct-to-font zone in UTF-8 mode.
2302                  */
2303                 ok = tc && (c >= 32 ||
2304                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2305                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2306                         && (c != 127 || vc->vc_disp_ctrl)
2307                         && (c != 128+27);
2308
2309                 if (vc->vc_state == ESnormal && ok) {
2310                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2311                                 if (is_double_width(c))
2312                                         width = 2;
2313                         }
2314                         /* Now try to find out how to display it */
2315                         tc = conv_uni_to_pc(vc, tc);
2316                         if (tc & ~charmask) {
2317                                 if (tc == -1 || tc == -2) {
2318                                     continue; /* nothing to display */
2319                                 }
2320                                 /* Glyph not found */
2321                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2322                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2323                                        This would make absolutely no sense with Unicode in mind,
2324                                        but do this for ASCII characters since a font may lack
2325                                        Unicode mapping info and we don't want to end up with
2326                                        having question marks only. */
2327                                     tc = c;
2328                                 } else {
2329                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2330                                     tc = conv_uni_to_pc(vc, 0xfffd);
2331                                     if (tc < 0) {
2332                                         inverse = 1;
2333                                         tc = conv_uni_to_pc(vc, '?');
2334                                         if (tc < 0) tc = '?';
2335                                     }
2336                                 }
2337                         }
2338
2339                         if (!inverse) {
2340                                 vc_attr = vc->vc_attr;
2341                         } else {
2342                                 /* invert vc_attr */
2343                                 if (!vc->vc_can_do_color) {
2344                                         vc_attr = (vc->vc_attr) ^ 0x08;
2345                                 } else if (vc->vc_hi_font_mask == 0x100) {
2346                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2347                                 } else {
2348                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2349                                 }
2350                                 FLUSH
2351                         }
2352
2353                         while (1) {
2354                                 if (vc->vc_need_wrap || vc->vc_decim)
2355                                         FLUSH
2356                                 if (vc->vc_need_wrap) {
2357                                         cr(vc);
2358                                         lf(vc);
2359                                 }
2360                                 if (vc->vc_decim)
2361                                         insert_char(vc, 1);
2362                                 scr_writew(himask ?
2363                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2364                                              (vc_attr << 8) + tc,
2365                                            (u16 *) vc->vc_pos);
2366                                 if (DO_UPDATE(vc) && draw_x < 0) {
2367                                         draw_x = vc->vc_x;
2368                                         draw_from = vc->vc_pos;
2369                                 }
2370                                 if (vc->vc_x == vc->vc_cols - 1) {
2371                                         vc->vc_need_wrap = vc->vc_decawm;
2372                                         draw_to = vc->vc_pos + 2;
2373                                 } else {
2374                                         vc->vc_x++;
2375                                         draw_to = (vc->vc_pos += 2);
2376                                 }
2377
2378                                 if (!--width) break;
2379
2380                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2381                                 if (tc < 0) tc = ' ';
2382                         }
2383                         notify_write(vc, c);
2384
2385                         if (inverse) {
2386                                 FLUSH
2387                         }
2388
2389                         if (rescan) {
2390                                 rescan = 0;
2391                                 inverse = 0;
2392                                 width = 1;
2393                                 c = orig;
2394                                 goto rescan_last_byte;
2395                         }
2396                         continue;
2397                 }
2398                 FLUSH
2399                 do_con_trol(tty, vc, orig);
2400         }
2401         FLUSH
2402         console_conditional_schedule();
2403         console_unlock();
2404         notify_update(vc);
2405         return n;
2406 #undef FLUSH
2407 }
2408
2409 /*
2410  * This is the console switching callback.
2411  *
2412  * Doing console switching in a process context allows
2413  * us to do the switches asynchronously (needed when we want
2414  * to switch due to a keyboard interrupt).  Synchronization
2415  * with other console code and prevention of re-entrancy is
2416  * ensured with console_lock.
2417  */
2418 static void console_callback(struct work_struct *ignored)
2419 {
2420         console_lock();
2421
2422         if (want_console >= 0) {
2423                 if (want_console != fg_console &&
2424                     vc_cons_allocated(want_console)) {
2425                         hide_cursor(vc_cons[fg_console].d);
2426                         change_console(vc_cons[want_console].d);
2427                         /* we only changed when the console had already
2428                            been allocated - a new console is not created
2429                            in an interrupt routine */
2430                 }
2431                 want_console = -1;
2432         }
2433         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2434                 do_poke_blanked_console = 0;
2435                 poke_blanked_console();
2436         }
2437         if (scrollback_delta) {
2438                 struct vc_data *vc = vc_cons[fg_console].d;
2439                 clear_selection();
2440                 if (vc->vc_mode == KD_TEXT)
2441                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2442                 scrollback_delta = 0;
2443         }
2444         if (blank_timer_expired) {
2445                 do_blank_screen(0);
2446                 blank_timer_expired = 0;
2447         }
2448         notify_update(vc_cons[fg_console].d);
2449
2450         console_unlock();
2451 }
2452
2453 int set_console(int nr)
2454 {
2455         struct vc_data *vc = vc_cons[fg_console].d;
2456
2457         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2458                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2459
2460                 /*
2461                  * Console switch will fail in console_callback() or
2462                  * change_console() so there is no point scheduling
2463                  * the callback
2464                  *
2465                  * Existing set_console() users don't check the return
2466                  * value so this shouldn't break anything
2467                  */
2468                 return -EINVAL;
2469         }
2470
2471         want_console = nr;
2472         schedule_console_callback();
2473
2474         return 0;
2475 }
2476
2477 struct tty_driver *console_driver;
2478
2479 #ifdef CONFIG_VT_CONSOLE
2480
2481 /**
2482  * vt_kmsg_redirect() - Sets/gets the kernel message console
2483  * @new:        The new virtual terminal number or -1 if the console should stay
2484  *              unchanged
2485  *
2486  * By default, the kernel messages are always printed on the current virtual
2487  * console. However, the user may modify that default with the
2488  * TIOCL_SETKMSGREDIRECT ioctl call.
2489  *
2490  * This function sets the kernel message console to be @new. It returns the old
2491  * virtual console number. The virtual terminal number 0 (both as parameter and
2492  * return value) means no redirection (i.e. always printed on the currently
2493  * active console).
2494  *
2495  * The parameter -1 means that only the current console is returned, but the
2496  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2497  * case to make the code more understandable.
2498  *
2499  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2500  * the parameter and always returns 0.
2501  */
2502 int vt_kmsg_redirect(int new)
2503 {
2504         static int kmsg_con;
2505
2506         if (new != -1)
2507                 return xchg(&kmsg_con, new);
2508         else
2509                 return kmsg_con;
2510 }
2511
2512 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
2513
2514 /*
2515  *      Console on virtual terminal
2516  *
2517  * The console must be locked when we get here.
2518  */
2519
2520 static void vt_console_print(struct console *co, const char *b, unsigned count)
2521 {
2522         struct vc_data *vc = vc_cons[fg_console].d;
2523         unsigned char c;
2524         static DEFINE_SPINLOCK(printing_lock);
2525         const ushort *start;
2526         ushort cnt = 0;
2527         ushort myx;
2528         int kmsg_console;
2529
2530         /* console busy or not yet initialized */
2531         if (!printable)
2532                 return;
2533         if (!spin_trylock(&printing_lock))
2534                 return;
2535
2536         kmsg_console = vt_get_kmsg_redirect();
2537         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2538                 vc = vc_cons[kmsg_console - 1].d;
2539
2540         /* read `x' only after setting currcons properly (otherwise
2541            the `x' macro will read the x of the foreground console). */
2542         myx = vc->vc_x;
2543
2544         if (!vc_cons_allocated(fg_console)) {
2545                 /* impossible */
2546                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2547                 goto quit;
2548         }
2549
2550         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2551                 goto quit;
2552
2553         /* undraw cursor first */
2554         if (IS_FG(vc))
2555                 hide_cursor(vc);
2556
2557         start = (ushort *)vc->vc_pos;
2558
2559         /* Contrived structure to try to emulate original need_wrap behaviour
2560          * Problems caused when we have need_wrap set on '\n' character */
2561         while (count--) {
2562                 c = *b++;
2563                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2564                         if (cnt > 0) {
2565                                 if (CON_IS_VISIBLE(vc))
2566                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2567                                 vc->vc_x += cnt;
2568                                 if (vc->vc_need_wrap)
2569                                         vc->vc_x--;
2570                                 cnt = 0;
2571                         }
2572                         if (c == 8) {           /* backspace */
2573                                 bs(vc);
2574                                 start = (ushort *)vc->vc_pos;
2575                                 myx = vc->vc_x;
2576                                 continue;
2577                         }
2578                         if (c != 13)
2579                                 lf(vc);
2580                         cr(vc);
2581                         start = (ushort *)vc->vc_pos;
2582                         myx = vc->vc_x;
2583                         if (c == 10 || c == 13)
2584                                 continue;
2585                 }
2586                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2587                 notify_write(vc, c);
2588                 cnt++;
2589                 if (myx == vc->vc_cols - 1) {
2590                         vc->vc_need_wrap = 1;
2591                         continue;
2592                 }
2593                 vc->vc_pos += 2;
2594                 myx++;
2595         }
2596         if (cnt > 0) {
2597                 if (CON_IS_VISIBLE(vc))
2598                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2599                 vc->vc_x += cnt;
2600                 if (vc->vc_x == vc->vc_cols) {
2601                         vc->vc_x--;
2602                         vc->vc_need_wrap = 1;
2603                 }
2604         }
2605         set_cursor(vc);
2606         notify_update(vc);
2607
2608 quit:
2609         spin_unlock(&printing_lock);
2610 }
2611
2612 static struct tty_driver *vt_console_device(struct console *c, int *index)
2613 {
2614         *index = c->index ? c->index-1 : fg_console;
2615         return console_driver;
2616 }
2617
2618 static struct console vt_console_driver = {
2619         .name           = "tty",
2620         .write          = vt_console_print,
2621         .device         = vt_console_device,
2622         .unblank        = unblank_screen,
2623         .flags          = CON_PRINTBUFFER,
2624         .index          = -1,
2625 };
2626 #endif
2627
2628 /*
2629  *      Handling of Linux-specific VC ioctls
2630  */
2631
2632 /*
2633  * Generally a bit racy with respect to console_lock();.
2634  *
2635  * There are some functions which don't need it.
2636  *
2637  * There are some functions which can sleep for arbitrary periods
2638  * (paste_selection) but we don't need the lock there anyway.
2639  *
2640  * set_selection has locking, and definitely needs it
2641  */
2642
2643 int tioclinux(struct tty_struct *tty, unsigned long arg)
2644 {
2645         char type, data;
2646         char __user *p = (char __user *)arg;
2647         int lines;
2648         int ret;
2649
2650         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2651                 return -EPERM;
2652         if (get_user(type, p))
2653                 return -EFAULT;
2654         ret = 0;
2655
2656         switch (type)
2657         {
2658                 case TIOCL_SETSEL:
2659                         console_lock();
2660                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2661                         console_unlock();
2662                         break;
2663                 case TIOCL_PASTESEL:
2664                         ret = paste_selection(tty);
2665                         break;
2666                 case TIOCL_UNBLANKSCREEN:
2667                         console_lock();
2668                         unblank_screen();
2669                         console_unlock();
2670                         break;
2671                 case TIOCL_SELLOADLUT:
2672                         console_lock();
2673                         ret = sel_loadlut(p);
2674                         console_unlock();
2675                         break;
2676                 case TIOCL_GETSHIFTSTATE:
2677
2678         /*
2679          * Make it possible to react to Shift+Mousebutton.
2680          * Note that 'shift_state' is an undocumented
2681          * kernel-internal variable; programs not closely
2682          * related to the kernel should not use this.
2683          */
2684                         data = vt_get_shift_state();
2685                         ret = __put_user(data, p);
2686                         break;
2687                 case TIOCL_GETMOUSEREPORTING:
2688                         console_lock(); /* May be overkill */
2689                         data = mouse_reporting();
2690                         console_unlock();
2691                         ret = __put_user(data, p);
2692                         break;
2693                 case TIOCL_SETVESABLANK:
2694                         console_lock();
2695                         ret = set_vesa_blanking(p);
2696                         console_unlock();
2697                         break;
2698                 case TIOCL_GETKMSGREDIRECT:
2699                         data = vt_get_kmsg_redirect();
2700                         ret = __put_user(data, p);
2701                         break;
2702                 case TIOCL_SETKMSGREDIRECT:
2703                         if (!capable(CAP_SYS_ADMIN)) {
2704                                 ret = -EPERM;
2705                         } else {
2706                                 if (get_user(data, p+1))
2707                                         ret = -EFAULT;
2708                                 else
2709                                         vt_kmsg_redirect(data);
2710                         }
2711                         break;
2712                 case TIOCL_GETFGCONSOLE:
2713                         /* No locking needed as this is a transiently
2714                            correct return anyway if the caller hasn't
2715                            disabled switching */
2716                         ret = fg_console;
2717                         break;
2718                 case TIOCL_SCROLLCONSOLE:
2719                         if (get_user(lines, (s32 __user *)(p+4))) {
2720                                 ret = -EFAULT;
2721                         } else {
2722                                 /* Need the console lock here. Note that lots
2723                                    of other calls need fixing before the lock
2724                                    is actually useful ! */
2725                                 console_lock();
2726                                 scrollfront(vc_cons[fg_console].d, lines);
2727                                 console_unlock();
2728                                 ret = 0;
2729                         }
2730                         break;
2731                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2732                         console_lock();
2733                         ignore_poke = 1;
2734                         do_blank_screen(0);
2735                         console_unlock();
2736                         break;
2737                 case TIOCL_BLANKEDSCREEN:
2738                         ret = console_blanked;
2739                         break;
2740                 default:
2741                         ret = -EINVAL;
2742                         break;
2743         }
2744         return ret;
2745 }
2746
2747 /*
2748  * /dev/ttyN handling
2749  */
2750
2751 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2752 {
2753         int     retval;
2754
2755         retval = do_con_write(tty, buf, count);
2756         con_flush_chars(tty);
2757
2758         return retval;
2759 }
2760
2761 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2762 {
2763         if (in_interrupt())
2764                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2765         return do_con_write(tty, &ch, 1);
2766 }
2767
2768 static int con_write_room(struct tty_struct *tty)
2769 {
2770         if (tty->stopped)
2771                 return 0;
2772         return 32768;           /* No limit, really; we're not buffering */
2773 }
2774
2775 static int con_chars_in_buffer(struct tty_struct *tty)
2776 {
2777         return 0;               /* we're not buffering */
2778 }
2779
2780 /*
2781  * con_throttle and con_unthrottle are only used for
2782  * paste_selection(), which has to stuff in a large number of
2783  * characters...
2784  */
2785 static void con_throttle(struct tty_struct *tty)
2786 {
2787 }
2788
2789 static void con_unthrottle(struct tty_struct *tty)
2790 {
2791         struct vc_data *vc = tty->driver_data;
2792
2793         wake_up_interruptible(&vc->paste_wait);
2794 }
2795
2796 /*
2797  * Turn the Scroll-Lock LED on when the tty is stopped
2798  */
2799 static void con_stop(struct tty_struct *tty)
2800 {
2801         int console_num;
2802         if (!tty)
2803                 return;
2804         console_num = tty->index;
2805         if (!vc_cons_allocated(console_num))
2806                 return;
2807         vt_kbd_con_stop(console_num);
2808 }
2809
2810 /*
2811  * Turn the Scroll-Lock LED off when the console is started
2812  */
2813 static void con_start(struct tty_struct *tty)
2814 {
2815         int console_num;
2816         if (!tty)
2817                 return;
2818         console_num = tty->index;
2819         if (!vc_cons_allocated(console_num))
2820                 return;
2821         vt_kbd_con_start(console_num);
2822 }
2823
2824 static void con_flush_chars(struct tty_struct *tty)
2825 {
2826         struct vc_data *vc;
2827
2828         if (in_interrupt())     /* from flush_to_ldisc */
2829                 return;
2830
2831         /* if we race with con_close(), vt may be null */
2832         console_lock();
2833         vc = tty->driver_data;
2834         if (vc)
2835                 set_cursor(vc);
2836         console_unlock();
2837 }
2838
2839 /*
2840  * Allocate the console screen memory.
2841  */
2842 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2843 {
2844         unsigned int currcons = tty->index;
2845         struct vc_data *vc;
2846         int ret;
2847
2848         console_lock();
2849         ret = vc_allocate(currcons);
2850         if (ret)
2851                 goto unlock;
2852
2853         vc = vc_cons[currcons].d;
2854
2855         /* Still being freed */
2856         if (vc->port.tty) {
2857                 ret = -ERESTARTSYS;
2858                 goto unlock;
2859         }
2860
2861         ret = tty_port_install(&vc->port, driver, tty);
2862         if (ret)
2863                 goto unlock;
2864
2865         tty->driver_data = vc;
2866         vc->port.tty = tty;
2867
2868         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2869                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2870                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2871         }
2872         if (vc->vc_utf)
2873                 tty->termios.c_iflag |= IUTF8;
2874         else
2875                 tty->termios.c_iflag &= ~IUTF8;
2876 unlock:
2877         console_unlock();
2878         return ret;
2879 }
2880
2881 static int con_open(struct tty_struct *tty, struct file *filp)
2882 {
2883         /* everything done in install */
2884         return 0;
2885 }
2886
2887
2888 static void con_close(struct tty_struct *tty, struct file *filp)
2889 {
2890         /* Nothing to do - we defer to shutdown */
2891 }
2892
2893 static void con_shutdown(struct tty_struct *tty)
2894 {
2895         struct vc_data *vc = tty->driver_data;
2896         BUG_ON(vc == NULL);
2897         console_lock();
2898         vc->port.tty = NULL;
2899         console_unlock();
2900 }
2901
2902 static int default_color           = 7; /* white */
2903 static int default_italic_color    = 2; // green (ASCII)
2904 static int default_underline_color = 3; // cyan (ASCII)
2905 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2906 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2907 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2908
2909 static void vc_init(struct vc_data *vc, unsigned int rows,
2910                     unsigned int cols, int do_clear)
2911 {
2912         int j, k ;
2913
2914         vc->vc_cols = cols;
2915         vc->vc_rows = rows;
2916         vc->vc_size_row = cols << 1;
2917         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2918
2919         set_origin(vc);
2920         vc->vc_pos = vc->vc_origin;
2921         reset_vc(vc);
2922         for (j=k=0; j<16; j++) {
2923                 vc->vc_palette[k++] = default_red[j] ;
2924                 vc->vc_palette[k++] = default_grn[j] ;
2925                 vc->vc_palette[k++] = default_blu[j] ;
2926         }
2927         vc->vc_def_color       = default_color;
2928         vc->vc_ulcolor         = default_underline_color;
2929         vc->vc_itcolor         = default_italic_color;
2930         vc->vc_halfcolor       = 0x08;   /* grey */
2931         init_waitqueue_head(&vc->paste_wait);
2932         reset_terminal(vc, do_clear);
2933 }
2934
2935 /*
2936  * This routine initializes console interrupts, and does nothing
2937  * else. If you want the screen to clear, call tty_write with
2938  * the appropriate escape-sequence.
2939  */
2940
2941 static int __init con_init(void)
2942 {
2943         const char *display_desc = NULL;
2944         struct vc_data *vc;
2945         unsigned int currcons = 0, i;
2946
2947         console_lock();
2948
2949         if (conswitchp)
2950                 display_desc = conswitchp->con_startup();
2951         if (!display_desc) {
2952                 fg_console = 0;
2953                 console_unlock();
2954                 return 0;
2955         }
2956
2957         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2958                 struct con_driver *con_driver = &registered_con_driver[i];
2959
2960                 if (con_driver->con == NULL) {
2961                         con_driver->con = conswitchp;
2962                         con_driver->desc = display_desc;
2963                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2964                         con_driver->first = 0;
2965                         con_driver->last = MAX_NR_CONSOLES - 1;
2966                         break;
2967                 }
2968         }
2969
2970         for (i = 0; i < MAX_NR_CONSOLES; i++)
2971                 con_driver_map[i] = conswitchp;
2972
2973         if (blankinterval) {
2974                 blank_state = blank_normal_wait;
2975                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2976         }
2977
2978         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2979                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2980                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2981                 tty_port_init(&vc->port);
2982                 visual_init(vc, currcons, 1);
2983                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2984                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2985                         currcons || !vc->vc_sw->con_save_screen);
2986         }
2987         currcons = fg_console = 0;
2988         master_display_fg = vc = vc_cons[currcons].d;
2989         set_origin(vc);
2990         save_screen(vc);
2991         gotoxy(vc, vc->vc_x, vc->vc_y);
2992         csi_J(vc, 0);
2993         update_screen(vc);
2994         pr_info("Console: %s %s %dx%d\n",
2995                 vc->vc_can_do_color ? "colour" : "mono",
2996                 display_desc, vc->vc_cols, vc->vc_rows);
2997         printable = 1;
2998
2999         console_unlock();
3000
3001 #ifdef CONFIG_VT_CONSOLE
3002         register_console(&vt_console_driver);
3003 #endif
3004         return 0;
3005 }
3006 console_initcall(con_init);
3007
3008 static const struct tty_operations con_ops = {
3009         .install = con_install,
3010         .open = con_open,
3011         .close = con_close,
3012         .write = con_write,
3013         .write_room = con_write_room,
3014         .put_char = con_put_char,
3015         .flush_chars = con_flush_chars,
3016         .chars_in_buffer = con_chars_in_buffer,
3017         .ioctl = vt_ioctl,
3018 #ifdef CONFIG_COMPAT
3019         .compat_ioctl = vt_compat_ioctl,
3020 #endif
3021         .stop = con_stop,
3022         .start = con_start,
3023         .throttle = con_throttle,
3024         .unthrottle = con_unthrottle,
3025         .resize = vt_resize,
3026         .shutdown = con_shutdown
3027 };
3028
3029 static struct cdev vc0_cdev;
3030
3031 static ssize_t show_tty_active(struct device *dev,
3032                                 struct device_attribute *attr, char *buf)
3033 {
3034         return sprintf(buf, "tty%d\n", fg_console + 1);
3035 }
3036 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3037
3038 int __init vty_init(const struct file_operations *console_fops)
3039 {
3040         cdev_init(&vc0_cdev, console_fops);
3041         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3042             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3043                 panic("Couldn't register /dev/tty0 driver\n");
3044         tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
3045         if (IS_ERR(tty0dev))
3046                 tty0dev = NULL;
3047         else
3048                 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
3049
3050         vcs_init();
3051
3052         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3053         if (!console_driver)
3054                 panic("Couldn't allocate console driver\n");
3055
3056         console_driver->name = "tty";
3057         console_driver->name_base = 1;
3058         console_driver->major = TTY_MAJOR;
3059         console_driver->minor_start = 1;
3060         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3061         console_driver->init_termios = tty_std_termios;
3062         if (default_utf8)
3063                 console_driver->init_termios.c_iflag |= IUTF8;
3064         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3065         tty_set_operations(console_driver, &con_ops);
3066         if (tty_register_driver(console_driver))
3067                 panic("Couldn't register console driver\n");
3068         kbd_init();
3069         console_map_init();
3070 #ifdef CONFIG_MDA_CONSOLE
3071         mda_console_init();
3072 #endif
3073         return 0;
3074 }
3075
3076 #ifndef VT_SINGLE_DRIVER
3077
3078 static struct class *vtconsole_class;
3079
3080 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3081                            int deflt)
3082 {
3083         struct module *owner = csw->owner;
3084         const char *desc = NULL;
3085         struct con_driver *con_driver;
3086         int i, j = -1, k = -1, retval = -ENODEV;
3087
3088         if (!try_module_get(owner))
3089                 return -ENODEV;
3090
3091         WARN_CONSOLE_UNLOCKED();
3092
3093         /* check if driver is registered */
3094         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3095                 con_driver = &registered_con_driver[i];
3096
3097                 if (con_driver->con == csw) {
3098                         desc = con_driver->desc;
3099                         retval = 0;
3100                         break;
3101                 }
3102         }
3103
3104         if (retval)
3105                 goto err;
3106
3107         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3108                 csw->con_startup();
3109                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3110         }
3111
3112         if (deflt) {
3113                 if (conswitchp)
3114                         module_put(conswitchp->owner);
3115
3116                 __module_get(owner);
3117                 conswitchp = csw;
3118         }
3119
3120         first = max(first, con_driver->first);
3121         last = min(last, con_driver->last);
3122
3123         for (i = first; i <= last; i++) {
3124                 int old_was_color;
3125                 struct vc_data *vc = vc_cons[i].d;
3126
3127                 if (con_driver_map[i])
3128                         module_put(con_driver_map[i]->owner);
3129                 __module_get(owner);
3130                 con_driver_map[i] = csw;
3131
3132                 if (!vc || !vc->vc_sw)
3133                         continue;
3134
3135                 j = i;
3136
3137                 if (CON_IS_VISIBLE(vc)) {
3138                         k = i;
3139                         save_screen(vc);
3140                 }
3141
3142                 old_was_color = vc->vc_can_do_color;
3143                 vc->vc_sw->con_deinit(vc);
3144                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3145                 visual_init(vc, i, 0);
3146                 set_origin(vc);
3147                 update_attr(vc);
3148
3149                 /* If the console changed between mono <-> color, then
3150                  * the attributes in the screenbuf will be wrong.  The
3151                  * following resets all attributes to something sane.
3152                  */
3153                 if (old_was_color != vc->vc_can_do_color)
3154                         clear_buffer_attributes(vc);
3155         }
3156
3157         pr_info("Console: switching ");
3158         if (!deflt)
3159                 printk("consoles %d-%d ", first+1, last+1);
3160         if (j >= 0) {
3161                 struct vc_data *vc = vc_cons[j].d;
3162
3163                 printk("to %s %s %dx%d\n",
3164                        vc->vc_can_do_color ? "colour" : "mono",
3165                        desc, vc->vc_cols, vc->vc_rows);
3166
3167                 if (k >= 0) {
3168                         vc = vc_cons[k].d;
3169                         update_screen(vc);
3170                 }
3171         } else
3172                 printk("to %s\n", desc);
3173
3174         retval = 0;
3175 err:
3176         module_put(owner);
3177         return retval;
3178 };
3179
3180
3181 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3182 static int con_is_graphics(const struct consw *csw, int first, int last)
3183 {
3184         int i, retval = 0;
3185
3186         for (i = first; i <= last; i++) {
3187                 struct vc_data *vc = vc_cons[i].d;
3188
3189                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3190                         retval = 1;
3191                         break;
3192                 }
3193         }
3194
3195         return retval;
3196 }
3197
3198 /* unlocked version of unbind_con_driver() */
3199 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3200 {
3201         struct module *owner = csw->owner;
3202         const struct consw *defcsw = NULL;
3203         struct con_driver *con_driver = NULL, *con_back = NULL;
3204         int i, retval = -ENODEV;
3205
3206         if (!try_module_get(owner))
3207                 return -ENODEV;
3208
3209         WARN_CONSOLE_UNLOCKED();
3210
3211         /* check if driver is registered and if it is unbindable */
3212         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3213                 con_driver = &registered_con_driver[i];
3214
3215                 if (con_driver->con == csw &&
3216                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3217                         retval = 0;
3218                         break;
3219                 }
3220         }
3221
3222         if (retval)
3223                 goto err;
3224
3225         retval = -ENODEV;
3226
3227         /* check if backup driver exists */
3228         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3229                 con_back = &registered_con_driver[i];
3230
3231                 if (con_back->con && con_back->con != csw) {
3232                         defcsw = con_back->con;
3233                         retval = 0;
3234                         break;
3235                 }
3236         }
3237
3238         if (retval)
3239                 goto err;
3240
3241         if (!con_is_bound(csw))
3242                 goto err;
3243
3244         first = max(first, con_driver->first);
3245         last = min(last, con_driver->last);
3246
3247         for (i = first; i <= last; i++) {
3248                 if (con_driver_map[i] == csw) {
3249                         module_put(csw->owner);
3250                         con_driver_map[i] = NULL;
3251                 }
3252         }
3253
3254         if (!con_is_bound(defcsw)) {
3255                 const struct consw *defconsw = conswitchp;
3256
3257                 defcsw->con_startup();
3258                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3259                 /*
3260                  * vgacon may change the default driver to point
3261                  * to dummycon, we restore it here...
3262                  */
3263                 conswitchp = defconsw;
3264         }
3265
3266         if (!con_is_bound(csw))
3267                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3268
3269         /* ignore return value, binding should not fail */
3270         do_bind_con_driver(defcsw, first, last, deflt);
3271 err:
3272         module_put(owner);
3273         return retval;
3274
3275 }
3276 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3277
3278 static int vt_bind(struct con_driver *con)
3279 {
3280         const struct consw *defcsw = NULL, *csw = NULL;
3281         int i, more = 1, first = -1, last = -1, deflt = 0;
3282
3283         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3284             con_is_graphics(con->con, con->first, con->last))
3285                 goto err;
3286
3287         csw = con->con;
3288
3289         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3290                 struct con_driver *con = &registered_con_driver[i];
3291
3292                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3293                         defcsw = con->con;
3294                         break;
3295                 }
3296         }
3297
3298         if (!defcsw)
3299                 goto err;
3300
3301         while (more) {
3302                 more = 0;
3303
3304                 for (i = con->first; i <= con->last; i++) {
3305                         if (con_driver_map[i] == defcsw) {
3306                                 if (first == -1)
3307                                         first = i;
3308                                 last = i;
3309                                 more = 1;
3310                         } else if (first != -1)
3311                                 break;
3312                 }
3313
3314                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3315                         deflt = 1;
3316
3317                 if (first != -1) {
3318                         console_lock();
3319                         do_bind_con_driver(csw, first, last, deflt);
3320                         console_unlock();
3321                 }
3322
3323                 first = -1;
3324                 last = -1;
3325                 deflt = 0;
3326         }
3327
3328 err:
3329         return 0;
3330 }
3331
3332 static int vt_unbind(struct con_driver *con)
3333 {
3334         const struct consw *csw = NULL;
3335         int i, more = 1, first = -1, last = -1, deflt = 0;
3336         int ret;
3337
3338         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3339             con_is_graphics(con->con, con->first, con->last))
3340                 goto err;
3341
3342         csw = con->con;
3343
3344         while (more) {
3345                 more = 0;
3346
3347                 for (i = con->first; i <= con->last; i++) {
3348                         if (con_driver_map[i] == csw) {
3349                                 if (first == -1)
3350                                         first = i;
3351                                 last = i;
3352                                 more = 1;
3353                         } else if (first != -1)
3354                                 break;
3355                 }
3356
3357                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3358                         deflt = 1;
3359
3360                 if (first != -1) {
3361                         console_lock();
3362                         ret = do_unbind_con_driver(csw, first, last, deflt);
3363                         console_unlock();
3364                         if (ret != 0)
3365                                 return ret;
3366                 }
3367
3368                 first = -1;
3369                 last = -1;
3370                 deflt = 0;
3371         }
3372
3373 err:
3374         return 0;
3375 }
3376 #else
3377 static inline int vt_bind(struct con_driver *con)
3378 {
3379         return 0;
3380 }
3381 static inline int vt_unbind(struct con_driver *con)
3382 {
3383         return 0;
3384 }
3385 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3386
3387 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3388                           const char *buf, size_t count)
3389 {
3390         struct con_driver *con = dev_get_drvdata(dev);
3391         int bind = simple_strtoul(buf, NULL, 0);
3392
3393         if (bind)
3394                 vt_bind(con);
3395         else
3396                 vt_unbind(con);
3397
3398         return count;
3399 }
3400
3401 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3402                          char *buf)
3403 {
3404         struct con_driver *con = dev_get_drvdata(dev);
3405         int bind = con_is_bound(con->con);
3406
3407         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3408 }
3409
3410 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3411                          char *buf)
3412 {
3413         struct con_driver *con = dev_get_drvdata(dev);
3414
3415         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3416                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3417                          con->desc);
3418
3419 }
3420
3421 static struct device_attribute device_attrs[] = {
3422         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3423         __ATTR(name, S_IRUGO, show_name, NULL),
3424 };
3425
3426 static int vtconsole_init_device(struct con_driver *con)
3427 {
3428         int i;
3429         int error = 0;
3430
3431         con->flag |= CON_DRIVER_FLAG_ATTR;
3432         dev_set_drvdata(con->dev, con);
3433         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3434                 error = device_create_file(con->dev, &device_attrs[i]);
3435                 if (error)
3436                         break;
3437         }
3438
3439         if (error) {
3440                 while (--i >= 0)
3441                         device_remove_file(con->dev, &device_attrs[i]);
3442                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3443         }
3444
3445         return error;
3446 }
3447
3448 static void vtconsole_deinit_device(struct con_driver *con)
3449 {
3450         int i;
3451
3452         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3453                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3454                         device_remove_file(con->dev, &device_attrs[i]);
3455                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3456         }
3457 }
3458
3459 /**
3460  * con_is_bound - checks if driver is bound to the console
3461  * @csw: console driver
3462  *
3463  * RETURNS: zero if unbound, nonzero if bound
3464  *
3465  * Drivers can call this and if zero, they should release
3466  * all resources allocated on con_startup()
3467  */
3468 int con_is_bound(const struct consw *csw)
3469 {
3470         int i, bound = 0;
3471
3472         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3473                 if (con_driver_map[i] == csw) {
3474                         bound = 1;
3475                         break;
3476                 }
3477         }
3478
3479         return bound;
3480 }
3481 EXPORT_SYMBOL(con_is_bound);
3482
3483 /**
3484  * con_debug_enter - prepare the console for the kernel debugger
3485  * @sw: console driver
3486  *
3487  * Called when the console is taken over by the kernel debugger, this
3488  * function needs to save the current console state, then put the console
3489  * into a state suitable for the kernel debugger.
3490  *
3491  * RETURNS:
3492  * Zero on success, nonzero if a failure occurred when trying to prepare
3493  * the console for the debugger.
3494  */
3495 int con_debug_enter(struct vc_data *vc)
3496 {
3497         int ret = 0;
3498
3499         saved_fg_console = fg_console;
3500         saved_last_console = last_console;
3501         saved_want_console = want_console;
3502         saved_vc_mode = vc->vc_mode;
3503         saved_console_blanked = console_blanked;
3504         vc->vc_mode = KD_TEXT;
3505         console_blanked = 0;
3506         if (vc->vc_sw->con_debug_enter)
3507                 ret = vc->vc_sw->con_debug_enter(vc);
3508 #ifdef CONFIG_KGDB_KDB
3509         /* Set the initial LINES variable if it is not already set */
3510         if (vc->vc_rows < 999) {
3511                 int linecount;
3512                 char lns[4];
3513                 const char *setargs[3] = {
3514                         "set",
3515                         "LINES",
3516                         lns,
3517                 };
3518                 if (kdbgetintenv(setargs[0], &linecount)) {
3519                         snprintf(lns, 4, "%i", vc->vc_rows);
3520                         kdb_set(2, setargs);
3521                 }
3522         }
3523         if (vc->vc_cols < 999) {
3524                 int colcount;
3525                 char cols[4];
3526                 const char *setargs[3] = {
3527                         "set",
3528                         "COLUMNS",
3529                         cols,
3530                 };
3531                 if (kdbgetintenv(setargs[0], &colcount)) {
3532                         snprintf(cols, 4, "%i", vc->vc_cols);
3533                         kdb_set(2, setargs);
3534                 }
3535         }
3536 #endif /* CONFIG_KGDB_KDB */
3537         return ret;
3538 }
3539 EXPORT_SYMBOL_GPL(con_debug_enter);
3540
3541 /**
3542  * con_debug_leave - restore console state
3543  * @sw: console driver
3544  *
3545  * Restore the console state to what it was before the kernel debugger
3546  * was invoked.
3547  *
3548  * RETURNS:
3549  * Zero on success, nonzero if a failure occurred when trying to restore
3550  * the console.
3551  */
3552 int con_debug_leave(void)
3553 {
3554         struct vc_data *vc;
3555         int ret = 0;
3556
3557         fg_console = saved_fg_console;
3558         last_console = saved_last_console;
3559         want_console = saved_want_console;
3560         console_blanked = saved_console_blanked;
3561         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3562
3563         vc = vc_cons[fg_console].d;
3564         if (vc->vc_sw->con_debug_leave)
3565                 ret = vc->vc_sw->con_debug_leave(vc);
3566         return ret;
3567 }
3568 EXPORT_SYMBOL_GPL(con_debug_leave);
3569
3570 static int do_register_con_driver(const struct consw *csw, int first, int last)
3571 {
3572         struct module *owner = csw->owner;
3573         struct con_driver *con_driver;
3574         const char *desc;
3575         int i, retval = 0;
3576
3577         WARN_CONSOLE_UNLOCKED();
3578
3579         if (!try_module_get(owner))
3580                 return -ENODEV;
3581
3582         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3583                 con_driver = &registered_con_driver[i];
3584
3585                 /* already registered */
3586                 if (con_driver->con == csw)
3587                         retval = -EBUSY;
3588         }
3589
3590         if (retval)
3591                 goto err;
3592
3593         desc = csw->con_startup();
3594
3595         if (!desc)
3596                 goto err;
3597
3598         retval = -EINVAL;
3599
3600         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3601                 con_driver = &registered_con_driver[i];
3602
3603                 if (con_driver->con == NULL) {
3604                         con_driver->con = csw;
3605                         con_driver->desc = desc;
3606                         con_driver->node = i;
3607                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3608                                            CON_DRIVER_FLAG_INIT;
3609                         con_driver->first = first;
3610                         con_driver->last = last;
3611                         retval = 0;
3612                         break;
3613                 }
3614         }
3615
3616         if (retval)
3617                 goto err;
3618
3619         con_driver->dev = device_create(vtconsole_class, NULL,
3620                                                 MKDEV(0, con_driver->node),
3621                                                 NULL, "vtcon%i",
3622                                                 con_driver->node);
3623
3624         if (IS_ERR(con_driver->dev)) {
3625                 printk(KERN_WARNING "Unable to create device for %s; "
3626                        "errno = %ld\n", con_driver->desc,
3627                        PTR_ERR(con_driver->dev));
3628                 con_driver->dev = NULL;
3629         } else {
3630                 vtconsole_init_device(con_driver);
3631         }
3632
3633 err:
3634         module_put(owner);
3635         return retval;
3636 }
3637
3638
3639 /**
3640  * do_unregister_con_driver - unregister console driver from console layer
3641  * @csw: console driver
3642  *
3643  * DESCRIPTION: All drivers that registers to the console layer must
3644  * call this function upon exit, or if the console driver is in a state
3645  * where it won't be able to handle console services, such as the
3646  * framebuffer console without loaded framebuffer drivers.
3647  *
3648  * The driver must unbind first prior to unregistration.
3649  */
3650 int do_unregister_con_driver(const struct consw *csw)
3651 {
3652         int i;
3653
3654         /* cannot unregister a bound driver */
3655         if (con_is_bound(csw))
3656                 return -EBUSY;
3657
3658         if (csw == conswitchp)
3659                 return -EINVAL;
3660
3661         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3662                 struct con_driver *con_driver = &registered_con_driver[i];
3663
3664                 if (con_driver->con == csw &&
3665                     con_driver->flag & CON_DRIVER_FLAG_INIT) {
3666                         vtconsole_deinit_device(con_driver);
3667                         device_destroy(vtconsole_class,
3668                                        MKDEV(0, con_driver->node));
3669                         con_driver->con = NULL;
3670                         con_driver->desc = NULL;
3671                         con_driver->dev = NULL;
3672                         con_driver->node = 0;
3673                         con_driver->flag = 0;
3674                         con_driver->first = 0;
3675                         con_driver->last = 0;
3676                         return 0;
3677                 }
3678         }
3679
3680         return -ENODEV;
3681 }
3682 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3683
3684 /*
3685  *      If we support more console drivers, this function is used
3686  *      when a driver wants to take over some existing consoles
3687  *      and become default driver for newly opened ones.
3688  *
3689  *      do_take_over_console is basically a register followed by unbind
3690  */
3691 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3692 {
3693         int err;
3694
3695         err = do_register_con_driver(csw, first, last);
3696         /*
3697          * If we get an busy error we still want to bind the console driver
3698          * and return success, as we may have unbound the console driver
3699          * but not unregistered it.
3700          */
3701         if (err == -EBUSY)
3702                 err = 0;
3703         if (!err)
3704                 do_bind_con_driver(csw, first, last, deflt);
3705
3706         return err;
3707 }
3708 EXPORT_SYMBOL_GPL(do_take_over_console);
3709
3710
3711 /*
3712  * give_up_console is a wrapper to unregister_con_driver. It will only
3713  * work if driver is fully unbound.
3714  */
3715 void give_up_console(const struct consw *csw)
3716 {
3717         console_lock();
3718         do_unregister_con_driver(csw);
3719         console_unlock();
3720 }
3721
3722 static int __init vtconsole_class_init(void)
3723 {
3724         int i;
3725
3726         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3727         if (IS_ERR(vtconsole_class)) {
3728                 printk(KERN_WARNING "Unable to create vt console class; "
3729                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3730                 vtconsole_class = NULL;
3731         }
3732
3733         /* Add system drivers to sysfs */
3734         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3735                 struct con_driver *con = &registered_con_driver[i];
3736
3737                 if (con->con && !con->dev) {
3738                         con->dev = device_create(vtconsole_class, NULL,
3739                                                          MKDEV(0, con->node),
3740                                                          NULL, "vtcon%i",
3741                                                          con->node);
3742
3743                         if (IS_ERR(con->dev)) {
3744                                 printk(KERN_WARNING "Unable to create "
3745                                        "device for %s; errno = %ld\n",
3746                                        con->desc, PTR_ERR(con->dev));
3747                                 con->dev = NULL;
3748                         } else {
3749                                 vtconsole_init_device(con);
3750                         }
3751                 }
3752         }
3753
3754         return 0;
3755 }
3756 postcore_initcall(vtconsole_class_init);
3757
3758 #endif
3759
3760 /*
3761  *      Screen blanking
3762  */
3763
3764 static int set_vesa_blanking(char __user *p)
3765 {
3766         unsigned int mode;
3767
3768         if (get_user(mode, p + 1))
3769                 return -EFAULT;
3770
3771         vesa_blank_mode = (mode < 4) ? mode : 0;
3772         return 0;
3773 }
3774
3775 void do_blank_screen(int entering_gfx)
3776 {
3777         struct vc_data *vc = vc_cons[fg_console].d;
3778         int i;
3779
3780         WARN_CONSOLE_UNLOCKED();
3781
3782         if (console_blanked) {
3783                 if (blank_state == blank_vesa_wait) {
3784                         blank_state = blank_off;
3785                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3786                 }
3787                 return;
3788         }
3789
3790         /* entering graphics mode? */
3791         if (entering_gfx) {
3792                 hide_cursor(vc);
3793                 save_screen(vc);
3794                 vc->vc_sw->con_blank(vc, -1, 1);
3795                 console_blanked = fg_console + 1;
3796                 blank_state = blank_off;
3797                 set_origin(vc);
3798                 return;
3799         }
3800
3801         if (blank_state != blank_normal_wait)
3802                 return;
3803         blank_state = blank_off;
3804
3805         /* don't blank graphics */
3806         if (vc->vc_mode != KD_TEXT) {
3807                 console_blanked = fg_console + 1;
3808                 return;
3809         }
3810
3811         hide_cursor(vc);
3812         del_timer_sync(&console_timer);
3813         blank_timer_expired = 0;
3814
3815         save_screen(vc);
3816         /* In case we need to reset origin, blanking hook returns 1 */
3817         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3818         console_blanked = fg_console + 1;
3819         if (i)
3820                 set_origin(vc);
3821
3822         if (console_blank_hook && console_blank_hook(1))
3823                 return;
3824
3825         if (vesa_off_interval && vesa_blank_mode) {
3826                 blank_state = blank_vesa_wait;
3827                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3828         }
3829         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3830 }
3831 EXPORT_SYMBOL(do_blank_screen);
3832
3833 /*
3834  * Called by timer as well as from vt_console_driver
3835  */
3836 void do_unblank_screen(int leaving_gfx)
3837 {
3838         struct vc_data *vc;
3839
3840         /* This should now always be called from a "sane" (read: can schedule)
3841          * context for the sake of the low level drivers, except in the special
3842          * case of oops_in_progress
3843          */
3844         if (!oops_in_progress)
3845                 might_sleep();
3846
3847         WARN_CONSOLE_UNLOCKED();
3848
3849         ignore_poke = 0;
3850         if (!console_blanked)
3851                 return;
3852         if (!vc_cons_allocated(fg_console)) {
3853                 /* impossible */
3854                 pr_warning("unblank_screen: tty %d not allocated ??\n",
3855                            fg_console+1);
3856                 return;
3857         }
3858         vc = vc_cons[fg_console].d;
3859         /* Try to unblank in oops case too */
3860         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3861                 return; /* but leave console_blanked != 0 */
3862
3863         if (blankinterval) {
3864                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3865                 blank_state = blank_normal_wait;
3866         }
3867
3868         console_blanked = 0;
3869         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3870                 /* Low-level driver cannot restore -> do it ourselves */
3871                 update_screen(vc);
3872         if (console_blank_hook)
3873                 console_blank_hook(0);
3874         set_palette(vc);
3875         set_cursor(vc);
3876         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3877 }
3878 EXPORT_SYMBOL(do_unblank_screen);
3879
3880 /*
3881  * This is called by the outside world to cause a forced unblank, mostly for
3882  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3883  * call it with 1 as an argument and so force a mode restore... that may kill
3884  * X or at least garbage the screen but would also make the Oops visible...
3885  */
3886 void unblank_screen(void)
3887 {
3888         do_unblank_screen(0);
3889 }
3890
3891 /*
3892  * We defer the timer blanking to work queue so it can take the console mutex
3893  * (console operations can still happen at irq time, but only from printk which
3894  * has the console mutex. Not perfect yet, but better than no locking
3895  */
3896 static void blank_screen_t(unsigned long dummy)
3897 {
3898         if (unlikely(!keventd_up())) {
3899                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3900                 return;
3901         }
3902         blank_timer_expired = 1;
3903         schedule_work(&console_work);
3904 }
3905
3906 void poke_blanked_console(void)
3907 {
3908         WARN_CONSOLE_UNLOCKED();
3909
3910         /* Add this so we quickly catch whoever might call us in a non
3911          * safe context. Nowadays, unblank_screen() isn't to be called in
3912          * atomic contexts and is allowed to schedule (with the special case
3913          * of oops_in_progress, but that isn't of any concern for this
3914          * function. --BenH.
3915          */
3916         might_sleep();
3917
3918         /* This isn't perfectly race free, but a race here would be mostly harmless,
3919          * at worse, we'll do a spurrious blank and it's unlikely
3920          */
3921         del_timer(&console_timer);
3922         blank_timer_expired = 0;
3923
3924         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3925                 return;
3926         if (console_blanked)
3927                 unblank_screen();
3928         else if (blankinterval) {
3929                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3930                 blank_state = blank_normal_wait;
3931         }
3932 }
3933
3934 /*
3935  *      Palettes
3936  */
3937
3938 static void set_palette(struct vc_data *vc)
3939 {
3940         WARN_CONSOLE_UNLOCKED();
3941
3942         if (vc->vc_mode != KD_GRAPHICS)
3943                 vc->vc_sw->con_set_palette(vc, color_table);
3944 }
3945
3946 /*
3947  * Load palette into the DAC registers. arg points to a colour
3948  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3949  */
3950
3951 int con_set_cmap(unsigned char __user *arg)
3952 {
3953         int i, j, k;
3954         unsigned char colormap[3*16];
3955
3956         if (copy_from_user(colormap, arg, sizeof(colormap)))
3957                 return -EFAULT;
3958
3959         console_lock();
3960         for (i = k = 0; i < 16; i++) {
3961                 default_red[i] = colormap[k++];
3962                 default_grn[i] = colormap[k++];
3963                 default_blu[i] = colormap[k++];
3964         }
3965         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3966                 if (!vc_cons_allocated(i))
3967                         continue;
3968                 for (j = k = 0; j < 16; j++) {
3969                         vc_cons[i].d->vc_palette[k++] = default_red[j];
3970                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
3971                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
3972                 }
3973                 set_palette(vc_cons[i].d);
3974         }
3975         console_unlock();
3976
3977         return 0;
3978 }
3979
3980 int con_get_cmap(unsigned char __user *arg)
3981 {
3982         int i, k;
3983         unsigned char colormap[3*16];
3984
3985         console_lock();
3986         for (i = k = 0; i < 16; i++) {
3987                 colormap[k++] = default_red[i];
3988                 colormap[k++] = default_grn[i];
3989                 colormap[k++] = default_blu[i];
3990         }
3991         console_unlock();
3992
3993         if (copy_to_user(arg, colormap, sizeof(colormap)))
3994                 return -EFAULT;
3995
3996         return 0;
3997 }
3998
3999 void reset_palette(struct vc_data *vc)
4000 {
4001         int j, k;
4002         for (j=k=0; j<16; j++) {
4003                 vc->vc_palette[k++] = default_red[j];
4004                 vc->vc_palette[k++] = default_grn[j];
4005                 vc->vc_palette[k++] = default_blu[j];
4006         }
4007         set_palette(vc);
4008 }
4009
4010 /*
4011  *  Font switching
4012  *
4013  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4014  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4015  *  depending on width) reserved for each character which is kinda wasty, but
4016  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4017  *  is up to the actual low-level console-driver convert data into its favorite
4018  *  format (maybe we should add a `fontoffset' field to the `display'
4019  *  structure so we won't have to convert the fontdata all the time.
4020  *  /Jes
4021  */
4022
4023 #define max_font_size 65536
4024
4025 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4026 {
4027         struct console_font font;
4028         int rc = -EINVAL;
4029         int c;
4030
4031         if (op->data) {
4032                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4033                 if (!font.data)
4034                         return -ENOMEM;
4035         } else
4036                 font.data = NULL;
4037
4038         console_lock();
4039         if (vc->vc_mode != KD_TEXT)
4040                 rc = -EINVAL;
4041         else if (vc->vc_sw->con_font_get)
4042                 rc = vc->vc_sw->con_font_get(vc, &font);
4043         else
4044                 rc = -ENOSYS;
4045         console_unlock();
4046
4047         if (rc)
4048                 goto out;
4049
4050         c = (font.width+7)/8 * 32 * font.charcount;
4051
4052         if (op->data && font.charcount > op->charcount)
4053                 rc = -ENOSPC;
4054         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4055                 if (font.width > op->width || font.height > op->height)
4056                         rc = -ENOSPC;
4057         } else {
4058                 if (font.width != 8)
4059                         rc = -EIO;
4060                 else if ((op->height && font.height > op->height) ||
4061                          font.height > 32)
4062                         rc = -ENOSPC;
4063         }
4064         if (rc)
4065                 goto out;
4066
4067         op->height = font.height;
4068         op->width = font.width;
4069         op->charcount = font.charcount;
4070
4071         if (op->data && copy_to_user(op->data, font.data, c))
4072                 rc = -EFAULT;
4073
4074 out:
4075         kfree(font.data);
4076         return rc;
4077 }
4078
4079 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4080 {
4081         struct console_font font;
4082         int rc = -EINVAL;
4083         int size;
4084
4085         if (vc->vc_mode != KD_TEXT)
4086                 return -EINVAL;
4087         if (!op->data)
4088                 return -EINVAL;
4089         if (op->charcount > 512)
4090                 return -EINVAL;
4091         if (!op->height) {              /* Need to guess font height [compat] */
4092                 int h, i;
4093                 u8 __user *charmap = op->data;
4094                 u8 tmp;
4095
4096                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4097                    so that we can get rid of this soon */
4098                 if (!(op->flags & KD_FONT_FLAG_OLD))
4099                         return -EINVAL;
4100                 for (h = 32; h > 0; h--)
4101                         for (i = 0; i < op->charcount; i++) {
4102                                 if (get_user(tmp, &charmap[32*i+h-1]))
4103                                         return -EFAULT;
4104                                 if (tmp)
4105                                         goto nonzero;
4106                         }
4107                 return -EINVAL;
4108         nonzero:
4109                 op->height = h;
4110         }
4111         if (op->width <= 0 || op->width > 32 || op->height > 32)
4112                 return -EINVAL;
4113         size = (op->width+7)/8 * 32 * op->charcount;
4114         if (size > max_font_size)
4115                 return -ENOSPC;
4116         font.charcount = op->charcount;
4117         font.height = op->height;
4118         font.width = op->width;
4119         font.data = memdup_user(op->data, size);
4120         if (IS_ERR(font.data))
4121                 return PTR_ERR(font.data);
4122         console_lock();
4123         if (vc->vc_mode != KD_TEXT)
4124                 rc = -EINVAL;
4125         else if (vc->vc_sw->con_font_set)
4126                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4127         else
4128                 rc = -ENOSYS;
4129         console_unlock();
4130         kfree(font.data);
4131         return rc;
4132 }
4133
4134 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4135 {
4136         struct console_font font = {.width = op->width, .height = op->height};
4137         char name[MAX_FONT_NAME];
4138         char *s = name;
4139         int rc;
4140
4141
4142         if (!op->data)
4143                 s = NULL;
4144         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4145                 return -EFAULT;
4146         else
4147                 name[MAX_FONT_NAME - 1] = 0;
4148
4149         console_lock();
4150         if (vc->vc_mode != KD_TEXT) {
4151                 console_unlock();
4152                 return -EINVAL;
4153         }
4154         if (vc->vc_sw->con_font_default)
4155                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4156         else
4157                 rc = -ENOSYS;
4158         console_unlock();
4159         if (!rc) {
4160                 op->width = font.width;
4161                 op->height = font.height;
4162         }
4163         return rc;
4164 }
4165
4166 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4167 {
4168         int con = op->height;
4169         int rc;
4170
4171
4172         console_lock();
4173         if (vc->vc_mode != KD_TEXT)
4174                 rc = -EINVAL;
4175         else if (!vc->vc_sw->con_font_copy)
4176                 rc = -ENOSYS;
4177         else if (con < 0 || !vc_cons_allocated(con))
4178                 rc = -ENOTTY;
4179         else if (con == vc->vc_num)     /* nothing to do */
4180                 rc = 0;
4181         else
4182                 rc = vc->vc_sw->con_font_copy(vc, con);
4183         console_unlock();
4184         return rc;
4185 }
4186
4187 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4188 {
4189         switch (op->op) {
4190         case KD_FONT_OP_SET:
4191                 return con_font_set(vc, op);
4192         case KD_FONT_OP_GET:
4193                 return con_font_get(vc, op);
4194         case KD_FONT_OP_SET_DEFAULT:
4195                 return con_font_default(vc, op);
4196         case KD_FONT_OP_COPY:
4197                 return con_font_copy(vc, op);
4198         }
4199         return -ENOSYS;
4200 }
4201
4202 /*
4203  *      Interface exported to selection and vcs.
4204  */
4205
4206 /* used by selection */
4207 u16 screen_glyph(struct vc_data *vc, int offset)
4208 {
4209         u16 w = scr_readw(screenpos(vc, offset, 1));
4210         u16 c = w & 0xff;
4211
4212         if (w & vc->vc_hi_font_mask)
4213                 c |= 0x100;
4214         return c;
4215 }
4216 EXPORT_SYMBOL_GPL(screen_glyph);
4217
4218 /* used by vcs - note the word offset */
4219 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4220 {
4221         return screenpos(vc, 2 * w_offset, viewed);
4222 }
4223
4224 void getconsxy(struct vc_data *vc, unsigned char *p)
4225 {
4226         p[0] = vc->vc_x;
4227         p[1] = vc->vc_y;
4228 }
4229
4230 void putconsxy(struct vc_data *vc, unsigned char *p)
4231 {
4232         hide_cursor(vc);
4233         gotoxy(vc, p[0], p[1]);
4234         set_cursor(vc);
4235 }
4236
4237 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4238 {
4239         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4240                 return softcursor_original;
4241         return scr_readw(org);
4242 }
4243
4244 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4245 {
4246         scr_writew(val, org);
4247         if ((unsigned long)org == vc->vc_pos) {
4248                 softcursor_original = -1;
4249                 add_softcursor(vc);
4250         }
4251 }
4252
4253 void vcs_scr_updated(struct vc_data *vc)
4254 {
4255         notify_update(vc);
4256 }
4257
4258 /*
4259  *      Visible symbols for modules
4260  */
4261
4262 EXPORT_SYMBOL(color_table);
4263 EXPORT_SYMBOL(default_red);
4264 EXPORT_SYMBOL(default_grn);
4265 EXPORT_SYMBOL(default_blu);
4266 EXPORT_SYMBOL(update_region);
4267 EXPORT_SYMBOL(redraw_screen);
4268 EXPORT_SYMBOL(vc_resize);
4269 EXPORT_SYMBOL(fg_console);
4270 EXPORT_SYMBOL(console_blank_hook);
4271 EXPORT_SYMBOL(console_blanked);
4272 EXPORT_SYMBOL(vc_cons);
4273 EXPORT_SYMBOL(global_cursor_default);
4274 #ifndef VT_SINGLE_DRIVER
4275 EXPORT_SYMBOL(give_up_console);
4276 #endif