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 = 0;
 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                 tty_port_destroy(&vc->port);
 783                 kfree(vc);
 784                 vc_cons[currcons].d = NULL;
 785                 return -ENOMEM;
 786             }
 787
 788             /* If no drivers have overridden us and the user didn't pass a
 789                boot option, default to displaying the cursor */
 790             if (global_cursor_default == -1)
 791                     global_cursor_default = 1;
 792
 793             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 794             vcs_make_sysfs(currcons);
 795             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 796         }
 797         return 0;
 798 }
 799
 800 static inline int resize_screen(struct vc_data *vc, int width, int height,
 801                                 int user)
 802 {
 803         /* Resizes the resolution of the display adapater */
 804         int err = 0;
 805
 806         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 807                 err = vc->vc_sw->con_resize(vc, width, height, user);
 808
 809         return err;
 810 }
 811
 812 /*
 813  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 814  * [this is to be used together with some user program
 815  * like resize that changes the hardware videomode]
 816  */
 817 #define VC_RESIZE_MAXCOL (32767)
 818 #define VC_RESIZE_MAXROW (32767)
 819
 820 /**
 821  *      vc_do_resize    -       resizing method for the tty
 822  *      @tty: tty being resized
 823  *      @real_tty: real tty (different to tty if a pty/tty pair)
 824  *      @vc: virtual console private data
 825  *      @cols: columns
 826  *      @lines: lines
 827  *
 828  *      Resize a virtual console, clipping according to the actual constraints.
 829  *      If the caller passes a tty structure then update the termios winsize
 830  *      information and perform any necessary signal handling.
 831  *
 832  *      Caller must hold the console semaphore. Takes the termios mutex and
 833  *      ctrl_lock of the tty IFF a tty is passed.
 834  */
 835
 836 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 837                                 unsigned int cols, unsigned int lines)
 838 {
 839         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 840         unsigned long end;
 841         unsigned int old_rows, old_row_size;
 842         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 843         unsigned int user;
 844         unsigned short *newscreen;
 845
 846         WARN_CONSOLE_UNLOCKED();
 847
 848         if (!vc)
 849                 return -ENXIO;
 850
 851         user = vc->vc_resize_user;
 852         vc->vc_resize_user = 0;
 853
 854         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 855                 return -EINVAL;
 856
 857         new_cols = (cols ? cols : vc->vc_cols);
 858         new_rows = (lines ? lines : vc->vc_rows);
 859         new_row_size = new_cols << 1;
 860         new_screen_size = new_row_size * new_rows;
 861
 862         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 863                 return 0;
 864
 865         newscreen = kmalloc(new_screen_size, GFP_USER);
 866         if (!newscreen)
 867                 return -ENOMEM;
 868
 869         old_rows = vc->vc_rows;
 870         old_row_size = vc->vc_size_row;
 871
 872         err = resize_screen(vc, new_cols, new_rows, user);
 873         if (err) {
 874                 kfree(newscreen);
 875                 return err;
 876         }
 877
 878         vc->vc_rows = new_rows;
 879         vc->vc_cols = new_cols;
 880         vc->vc_size_row = new_row_size;
 881         vc->vc_screenbuf_size = new_screen_size;
 882
 883         rlth = min(old_row_size, new_row_size);
 884         rrem = new_row_size - rlth;
 885         old_origin = vc->vc_origin;
 886         new_origin = (long) newscreen;
 887         new_scr_end = new_origin + new_screen_size;
 888
 889         if (vc->vc_y > new_rows) {
 890                 if (old_rows - vc->vc_y < new_rows) {
 891                         /*
 892                          * Cursor near the bottom, copy contents from the
 893                          * bottom of buffer
 894                          */
 895                         old_origin += (old_rows - new_rows) * old_row_size;
 896                 } else {
 897                         /*
 898                          * Cursor is in no man's land, copy 1/2 screenful
 899                          * from the top and bottom of cursor position
 900                          */
 901                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 902                 }
 903         }
 904
 905         end = old_origin + old_row_size * min(old_rows, new_rows);
 906
 907         update_attr(vc);
 908
 909         while (old_origin < end) {
 910                 scr_memcpyw((unsigned short *) new_origin,
 911                             (unsigned short *) old_origin, rlth);
 912                 if (rrem)
 913                         scr_memsetw((void *)(new_origin + rlth),
 914                                     vc->vc_video_erase_char, rrem);
 915                 old_origin += old_row_size;
 916                 new_origin += new_row_size;
 917         }
 918         if (new_scr_end > new_origin)
 919                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 920                             new_scr_end - new_origin);
 921         kfree(vc->vc_screenbuf);
 922         vc->vc_screenbuf = newscreen;
 923         vc->vc_screenbuf_size = new_screen_size;
 924         set_origin(vc);
 925
 926         /* do part of a reset_terminal() */
 927         vc->vc_top = 0;
 928         vc->vc_bottom = vc->vc_rows;
 929         gotoxy(vc, vc->vc_x, vc->vc_y);
 930         save_cur(vc);
 931
 932         if (tty) {
 933                 /* Rewrite the requested winsize data with the actual
 934                    resulting sizes */
 935                 struct winsize ws;
 936                 memset(&ws, 0, sizeof(ws));
 937                 ws.ws_row = vc->vc_rows;
 938                 ws.ws_col = vc->vc_cols;
 939                 ws.ws_ypixel = vc->vc_scan_lines;
 940                 tty_do_resize(tty, &ws);
 941         }
 942
 943         if (CON_IS_VISIBLE(vc))
 944                 update_screen(vc);
 945         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 946         return err;
 947 }
 948
 949 /**
 950  *      vc_resize               -       resize a VT
 951  *      @vc: virtual console
 952  *      @cols: columns
 953  *      @rows: rows
 954  *
 955  *      Resize a virtual console as seen from the console end of things. We
 956  *      use the common vc_do_resize methods to update the structures. The
 957  *      caller must hold the console sem to protect console internals and
 958  *      vc->port.tty
 959  */
 960
 961 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 962 {
 963         return vc_do_resize(vc->port.tty, vc, cols, rows);
 964 }
 965
 966 /**
 967  *      vt_resize               -       resize a VT
 968  *      @tty: tty to resize
 969  *      @ws: winsize attributes
 970  *
 971  *      Resize a virtual terminal. This is called by the tty layer as we
 972  *      register our own handler for resizing. The mutual helper does all
 973  *      the actual work.
 974  *
 975  *      Takes the console sem and the called methods then take the tty
 976  *      termios_mutex and the tty ctrl_lock in that order.
 977  */
 978 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 979 {
 980         struct vc_data *vc = tty->driver_data;
 981         int ret;
 982
 983         console_lock();
 984         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 985         console_unlock();
 986         return ret;
 987 }
 988
 989 void vc_deallocate(unsigned int currcons)
 990 {
 991         WARN_CONSOLE_UNLOCKED();
 992
 993         if (vc_cons_allocated(currcons)) {
 994                 struct vc_data *vc = vc_cons[currcons].d;
 995                 struct vt_notifier_param param = { .vc = vc };
 996
 997                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 998                 vcs_remove_sysfs(currcons);
 999                 vc->vc_sw->con_deinit(vc);
1000                 put_pid(vc->vt_pid);
1001                 module_put(vc->vc_sw->owner);
1002                 kfree(vc->vc_screenbuf);
1003                 if (currcons >= MIN_NR_CONSOLES) {
1004                         tty_port_destroy(&vc->port);
1005                         kfree(vc);
1006                 }
1007                 vc_cons[currcons].d = NULL;
1008         }
1009 }
1010
1011 /*
1012  *      VT102 emulator
1013  */
1014
1015 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1016 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1017 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1018
1019 #define decarm          VC_REPEAT
1020 #define decckm          VC_CKMODE
1021 #define kbdapplic       VC_APPLIC
1022 #define lnm             VC_CRLF
1023
1024 /*
1025  * this is what the terminal answers to a ESC-Z or csi0c query.
1026  */
1027 #define VT100ID "\033[?1;2c"
1028 #define VT102ID "\033[?6c"
1029
1030 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1031                                        8,12,10,14, 9,13,11,15 };
1032
1033 /* the default colour table, for VGA+ colour systems */
1034 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1035     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1036 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1037     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1038 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1039     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1040
1041 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1042 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1043 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1044
1045 /*
1046  * gotoxy() must verify all boundaries, because the arguments
1047  * might also be negative. If the given position is out of
1048  * bounds, the cursor is placed at the nearest margin.
1049  */
1050 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1051 {
1052         int min_y, max_y;
1053
1054         if (new_x < 0)
1055                 vc->vc_x = 0;
1056         else {
1057                 if (new_x >= vc->vc_cols)
1058                         vc->vc_x = vc->vc_cols - 1;
1059                 else
1060                         vc->vc_x = new_x;
1061         }
1062
1063         if (vc->vc_decom) {
1064                 min_y = vc->vc_top;
1065                 max_y = vc->vc_bottom;
1066         } else {
1067                 min_y = 0;
1068                 max_y = vc->vc_rows;
1069         }
1070         if (new_y < min_y)
1071                 vc->vc_y = min_y;
1072         else if (new_y >= max_y)
1073                 vc->vc_y = max_y - 1;
1074         else
1075                 vc->vc_y = new_y;
1076         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1077         vc->vc_need_wrap = 0;
1078 }
1079
1080 /* for absolute user moves, when decom is set */
1081 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1082 {
1083         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1084 }
1085
1086 void scrollback(struct vc_data *vc, int lines)
1087 {
1088         if (!lines)
1089                 lines = vc->vc_rows / 2;
1090         scrolldelta(-lines);
1091 }
1092
1093 void scrollfront(struct vc_data *vc, int lines)
1094 {
1095         if (!lines)
1096                 lines = vc->vc_rows / 2;
1097         scrolldelta(lines);
1098 }
1099
1100 static void lf(struct vc_data *vc)
1101 {
1102         /* don't scroll if above bottom of scrolling region, or
1103          * if below scrolling region
1104          */
1105         if (vc->vc_y + 1 == vc->vc_bottom)
1106                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1107         else if (vc->vc_y < vc->vc_rows - 1) {
1108                 vc->vc_y++;
1109                 vc->vc_pos += vc->vc_size_row;
1110         }
1111         vc->vc_need_wrap = 0;
1112         notify_write(vc, '\n');
1113 }
1114
1115 static void ri(struct vc_data *vc)
1116 {
1117         /* don't scroll if below top of scrolling region, or
1118          * if above scrolling region
1119          */
1120         if (vc->vc_y == vc->vc_top)
1121                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1122         else if (vc->vc_y > 0) {
1123                 vc->vc_y--;
1124                 vc->vc_pos -= vc->vc_size_row;
1125         }
1126         vc->vc_need_wrap = 0;
1127 }
1128
1129 static inline void cr(struct vc_data *vc)
1130 {
1131         vc->vc_pos -= vc->vc_x << 1;
1132         vc->vc_need_wrap = vc->vc_x = 0;
1133         notify_write(vc, '\r');
1134 }
1135
1136 static inline void bs(struct vc_data *vc)
1137 {
1138         if (vc->vc_x) {
1139                 vc->vc_pos -= 2;
1140                 vc->vc_x--;
1141                 vc->vc_need_wrap = 0;
1142                 notify_write(vc, '\b');
1143         }
1144 }
1145
1146 static inline void del(struct vc_data *vc)
1147 {
1148         /* ignored */
1149 }
1150
1151 static void csi_J(struct vc_data *vc, int vpar)
1152 {
1153         unsigned int count;
1154         unsigned short * start;
1155
1156         switch (vpar) {
1157                 case 0: /* erase from cursor to end of display */
1158                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1159                         start = (unsigned short *)vc->vc_pos;
1160                         break;
1161                 case 1: /* erase from start to cursor */
1162                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1163                         start = (unsigned short *)vc->vc_origin;
1164                         break;
1165                 case 3: /* erase scroll-back buffer (and whole display) */
1166                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1167                                     vc->vc_screenbuf_size >> 1);
1168                         set_origin(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 /* console_lock is held */
1235 static void csi_m(struct vc_data *vc)
1236 {
1237         int i;
1238
1239         for (i = 0; i <= vc->vc_npar; i++)
1240                 switch (vc->vc_par[i]) {
1241                         case 0: /* all attributes off */
1242                                 default_attr(vc);
1243                                 break;
1244                         case 1:
1245                                 vc->vc_intensity = 2;
1246                                 break;
1247                         case 2:
1248                                 vc->vc_intensity = 0;
1249                                 break;
1250                         case 3:
1251                                 vc->vc_italic = 1;
1252                                 break;
1253                         case 4:
1254                                 vc->vc_underline = 1;
1255                                 break;
1256                         case 5:
1257                                 vc->vc_blink = 1;
1258                                 break;
1259                         case 7:
1260                                 vc->vc_reverse = 1;
1261                                 break;
1262                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1263                                   * Select primary font, don't display
1264                                   * control chars if defined, don't set
1265                                   * bit 8 on output.
1266                                   */
1267                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1268                                                 ? vc->vc_G0_charset
1269                                                 : vc->vc_G1_charset, vc);
1270                                 vc->vc_disp_ctrl = 0;
1271                                 vc->vc_toggle_meta = 0;
1272                                 break;
1273                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1274                                   * Select first alternate font, lets
1275                                   * chars < 32 be displayed as ROM chars.
1276                                   */
1277                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1278                                 vc->vc_disp_ctrl = 1;
1279                                 vc->vc_toggle_meta = 0;
1280                                 break;
1281                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1282                                   * Select second alternate font, toggle
1283                                   * high bit before displaying as ROM char.
1284                                   */
1285                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1286                                 vc->vc_disp_ctrl = 1;
1287                                 vc->vc_toggle_meta = 1;
1288                                 break;
1289                         case 21:
1290                         case 22:
1291                                 vc->vc_intensity = 1;
1292                                 break;
1293                         case 23:
1294                                 vc->vc_italic = 0;
1295                                 break;
1296                         case 24:
1297                                 vc->vc_underline = 0;
1298                                 break;
1299                         case 25:
1300                                 vc->vc_blink = 0;
1301                                 break;
1302                         case 27:
1303                                 vc->vc_reverse = 0;
1304                                 break;
1305                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1306                                   * Enables underscore, white foreground
1307                                   * with white underscore (Linux - use
1308                                   * default foreground).
1309                                   */
1310                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1311                                 vc->vc_underline = 1;
1312                                 break;
1313                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1314                                   * Disable underline option.
1315                                   * Reset colour to default? It did this
1316                                   * before...
1317                                   */
1318                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1319                                 vc->vc_underline = 0;
1320                                 break;
1321                         case 49:
1322                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1323                                 break;
1324                         default:
1325                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1326                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1327                                                 | (vc->vc_color & 0xf0);
1328                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1329                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1330                                                 | (vc->vc_color & 0x0f);
1331                                 break;
1332                 }
1333         update_attr(vc);
1334 }
1335
1336 static void respond_string(const char *p, struct tty_port *port)
1337 {
1338         while (*p) {
1339                 tty_insert_flip_char(port, *p, 0);
1340                 p++;
1341         }
1342         tty_schedule_flip(port);
1343 }
1344
1345 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1346 {
1347         char buf[40];
1348
1349         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1350         respond_string(buf, tty->port);
1351 }
1352
1353 static inline void status_report(struct tty_struct *tty)
1354 {
1355         respond_string("\033[0n", tty->port);   /* Terminal ok */
1356 }
1357
1358 static inline void respond_ID(struct tty_struct *tty)
1359 {
1360         respond_string(VT102ID, tty->port);
1361 }
1362
1363 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1364 {
1365         char buf[8];
1366
1367         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1368                 (char)('!' + mry));
1369         respond_string(buf, tty->port);
1370 }
1371
1372 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1373 int mouse_reporting(void)
1374 {
1375         return vc_cons[fg_console].d->vc_report_mouse;
1376 }
1377
1378 /* console_lock is held */
1379 static void set_mode(struct vc_data *vc, int on_off)
1380 {
1381         int i;
1382
1383         for (i = 0; i <= vc->vc_npar; i++)
1384                 if (vc->vc_ques) {
1385                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1386                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1387                                 if (on_off)
1388                                         set_kbd(vc, decckm);
1389                                 else
1390                                         clr_kbd(vc, decckm);
1391                                 break;
1392                         case 3: /* 80/132 mode switch unimplemented */
1393                                 vc->vc_deccolm = on_off;
1394 #if 0
1395                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1396                                 /* this alone does not suffice; some user mode
1397                                    utility has to change the hardware regs */
1398 #endif
1399                                 break;
1400                         case 5:                 /* Inverted screen on/off */
1401                                 if (vc->vc_decscnm != on_off) {
1402                                         vc->vc_decscnm = on_off;
1403                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1404                                         update_attr(vc);
1405                                 }
1406                                 break;
1407                         case 6:                 /* Origin relative/absolute */
1408                                 vc->vc_decom = on_off;
1409                                 gotoxay(vc, 0, 0);
1410                                 break;
1411                         case 7:                 /* Autowrap on/off */
1412                                 vc->vc_decawm = on_off;
1413                                 break;
1414                         case 8:                 /* Autorepeat on/off */
1415                                 if (on_off)
1416                                         set_kbd(vc, decarm);
1417                                 else
1418                                         clr_kbd(vc, decarm);
1419                                 break;
1420                         case 9:
1421                                 vc->vc_report_mouse = on_off ? 1 : 0;
1422                                 break;
1423                         case 25:                /* Cursor on/off */
1424                                 vc->vc_deccm = on_off;
1425                                 break;
1426                         case 1000:
1427                                 vc->vc_report_mouse = on_off ? 2 : 0;
1428                                 break;
1429                         }
1430                 } else {
1431                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1432                         case 3:                 /* Monitor (display ctrls) */
1433                                 vc->vc_disp_ctrl = on_off;
1434                                 break;
1435                         case 4:                 /* Insert Mode on/off */
1436                                 vc->vc_decim = on_off;
1437                                 break;
1438                         case 20:                /* Lf, Enter == CrLf/Lf */
1439                                 if (on_off)
1440                                         set_kbd(vc, lnm);
1441                                 else
1442                                         clr_kbd(vc, lnm);
1443                                 break;
1444                         }
1445                 }
1446 }
1447
1448 /* console_lock is held */
1449 static void setterm_command(struct vc_data *vc)
1450 {
1451         switch(vc->vc_par[0]) {
1452                 case 1: /* set color for underline mode */
1453                         if (vc->vc_can_do_color &&
1454                                         vc->vc_par[1] < 16) {
1455                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1456                                 if (vc->vc_underline)
1457                                         update_attr(vc);
1458                         }
1459                         break;
1460                 case 2: /* set color for half intensity mode */
1461                         if (vc->vc_can_do_color &&
1462                                         vc->vc_par[1] < 16) {
1463                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1464                                 if (vc->vc_intensity == 0)
1465                                         update_attr(vc);
1466                         }
1467                         break;
1468                 case 8: /* store colors as defaults */
1469                         vc->vc_def_color = vc->vc_attr;
1470                         if (vc->vc_hi_font_mask == 0x100)
1471                                 vc->vc_def_color >>= 1;
1472                         default_attr(vc);
1473                         update_attr(vc);
1474                         break;
1475                 case 9: /* set blanking interval */
1476                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1477                         poke_blanked_console();
1478                         break;
1479                 case 10: /* set bell frequency in Hz */
1480                         if (vc->vc_npar >= 1)
1481                                 vc->vc_bell_pitch = vc->vc_par[1];
1482                         else
1483                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1484                         break;
1485                 case 11: /* set bell duration in msec */
1486                         if (vc->vc_npar >= 1)
1487                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1488                                         vc->vc_par[1] * HZ / 1000 : 0;
1489                         else
1490                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1491                         break;
1492                 case 12: /* bring specified console to the front */
1493                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1494                                 set_console(vc->vc_par[1] - 1);
1495                         break;
1496                 case 13: /* unblank the screen */
1497                         poke_blanked_console();
1498                         break;
1499                 case 14: /* set vesa powerdown interval */
1500                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1501                         break;
1502                 case 15: /* activate the previous console */
1503                         set_console(last_console);
1504                         break;
1505         }
1506 }
1507
1508 /* console_lock is held */
1509 static void csi_at(struct vc_data *vc, unsigned int nr)
1510 {
1511         if (nr > vc->vc_cols - vc->vc_x)
1512                 nr = vc->vc_cols - vc->vc_x;
1513         else if (!nr)
1514                 nr = 1;
1515         insert_char(vc, nr);
1516 }
1517
1518 /* console_lock is held */
1519 static void csi_L(struct vc_data *vc, unsigned int nr)
1520 {
1521         if (nr > vc->vc_rows - vc->vc_y)
1522                 nr = vc->vc_rows - vc->vc_y;
1523         else if (!nr)
1524                 nr = 1;
1525         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1526         vc->vc_need_wrap = 0;
1527 }
1528
1529 /* console_lock is held */
1530 static void csi_P(struct vc_data *vc, unsigned int nr)
1531 {
1532         if (nr > vc->vc_cols - vc->vc_x)
1533                 nr = vc->vc_cols - vc->vc_x;
1534         else if (!nr)
1535                 nr = 1;
1536         delete_char(vc, nr);
1537 }
1538
1539 /* console_lock is held */
1540 static void csi_M(struct vc_data *vc, unsigned int nr)
1541 {
1542         if (nr > vc->vc_rows - vc->vc_y)
1543                 nr = vc->vc_rows - vc->vc_y;
1544         else if (!nr)
1545                 nr=1;
1546         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1547         vc->vc_need_wrap = 0;
1548 }
1549
1550 /* console_lock is held (except via vc_init->reset_terminal */
1551 static void save_cur(struct vc_data *vc)
1552 {
1553         vc->vc_saved_x          = vc->vc_x;
1554         vc->vc_saved_y          = vc->vc_y;
1555         vc->vc_s_intensity      = vc->vc_intensity;
1556         vc->vc_s_italic         = vc->vc_italic;
1557         vc->vc_s_underline      = vc->vc_underline;
1558         vc->vc_s_blink          = vc->vc_blink;
1559         vc->vc_s_reverse        = vc->vc_reverse;
1560         vc->vc_s_charset        = vc->vc_charset;
1561         vc->vc_s_color          = vc->vc_color;
1562         vc->vc_saved_G0         = vc->vc_G0_charset;
1563         vc->vc_saved_G1         = vc->vc_G1_charset;
1564 }
1565
1566 /* console_lock is held */
1567 static void restore_cur(struct vc_data *vc)
1568 {
1569         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1570         vc->vc_intensity        = vc->vc_s_intensity;
1571         vc->vc_italic           = vc->vc_s_italic;
1572         vc->vc_underline        = vc->vc_s_underline;
1573         vc->vc_blink            = vc->vc_s_blink;
1574         vc->vc_reverse          = vc->vc_s_reverse;
1575         vc->vc_charset          = vc->vc_s_charset;
1576         vc->vc_color            = vc->vc_s_color;
1577         vc->vc_G0_charset       = vc->vc_saved_G0;
1578         vc->vc_G1_charset       = vc->vc_saved_G1;
1579         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1580         update_attr(vc);
1581         vc->vc_need_wrap = 0;
1582 }
1583
1584 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1585         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1586         ESpalette };
1587
1588 /* console_lock is held (except via vc_init()) */
1589 static void reset_terminal(struct vc_data *vc, int do_clear)
1590 {
1591         vc->vc_top              = 0;
1592         vc->vc_bottom           = vc->vc_rows;
1593         vc->vc_state            = ESnormal;
1594         vc->vc_ques             = 0;
1595         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1596         vc->vc_G0_charset       = LAT1_MAP;
1597         vc->vc_G1_charset       = GRAF_MAP;
1598         vc->vc_charset          = 0;
1599         vc->vc_need_wrap        = 0;
1600         vc->vc_report_mouse     = 0;
1601         vc->vc_utf              = default_utf8;
1602         vc->vc_utf_count        = 0;
1603
1604         vc->vc_disp_ctrl        = 0;
1605         vc->vc_toggle_meta      = 0;
1606
1607         vc->vc_decscnm          = 0;
1608         vc->vc_decom            = 0;
1609         vc->vc_decawm           = 1;
1610         vc->vc_deccm            = global_cursor_default;
1611         vc->vc_decim            = 0;
1612
1613         vt_reset_keyboard(vc->vc_num);
1614
1615         vc->vc_cursor_type = cur_default;
1616         vc->vc_complement_mask = vc->vc_s_complement_mask;
1617
1618         default_attr(vc);
1619         update_attr(vc);
1620
1621         vc->vc_tab_stop[0]      = 0x01010100;
1622         vc->vc_tab_stop[1]      =
1623         vc->vc_tab_stop[2]      =
1624         vc->vc_tab_stop[3]      =
1625         vc->vc_tab_stop[4]      =
1626         vc->vc_tab_stop[5]      =
1627         vc->vc_tab_stop[6]      =
1628         vc->vc_tab_stop[7]      = 0x01010101;
1629
1630         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1631         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1632
1633         gotoxy(vc, 0, 0);
1634         save_cur(vc);
1635         if (do_clear)
1636             csi_J(vc, 2);
1637 }
1638
1639 /* console_lock is held */
1640 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1641 {
1642         /*
1643          *  Control characters can be used in the _middle_
1644          *  of an escape sequence.
1645          */
1646         switch (c) {
1647         case 0:
1648                 return;
1649         case 7:
1650                 if (vc->vc_bell_duration)
1651                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1652                 return;
1653         case 8:
1654                 bs(vc);
1655                 return;
1656         case 9:
1657                 vc->vc_pos -= (vc->vc_x << 1);
1658                 while (vc->vc_x < vc->vc_cols - 1) {
1659                         vc->vc_x++;
1660                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1661                                 break;
1662                 }
1663                 vc->vc_pos += (vc->vc_x << 1);
1664                 notify_write(vc, '\t');
1665                 return;
1666         case 10: case 11: case 12:
1667                 lf(vc);
1668                 if (!is_kbd(vc, lnm))
1669                         return;
1670         case 13:
1671                 cr(vc);
1672                 return;
1673         case 14:
1674                 vc->vc_charset = 1;
1675                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1676                 vc->vc_disp_ctrl = 1;
1677                 return;
1678         case 15:
1679                 vc->vc_charset = 0;
1680                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1681                 vc->vc_disp_ctrl = 0;
1682                 return;
1683         case 24: case 26:
1684                 vc->vc_state = ESnormal;
1685                 return;
1686         case 27:
1687                 vc->vc_state = ESesc;
1688                 return;
1689         case 127:
1690                 del(vc);
1691                 return;
1692         case 128+27:
1693                 vc->vc_state = ESsquare;
1694                 return;
1695         }
1696         switch(vc->vc_state) {
1697         case ESesc:
1698                 vc->vc_state = ESnormal;
1699                 switch (c) {
1700                 case '[':
1701                         vc->vc_state = ESsquare;
1702                         return;
1703                 case ']':
1704                         vc->vc_state = ESnonstd;
1705                         return;
1706                 case '%':
1707                         vc->vc_state = ESpercent;
1708                         return;
1709                 case 'E':
1710                         cr(vc);
1711                         lf(vc);
1712                         return;
1713                 case 'M':
1714                         ri(vc);
1715                         return;
1716                 case 'D':
1717                         lf(vc);
1718                         return;
1719                 case 'H':
1720                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1721                         return;
1722                 case 'Z':
1723                         respond_ID(tty);
1724                         return;
1725                 case '7':
1726                         save_cur(vc);
1727                         return;
1728                 case '8':
1729                         restore_cur(vc);
1730                         return;
1731                 case '(':
1732                         vc->vc_state = ESsetG0;
1733                         return;
1734                 case ')':
1735                         vc->vc_state = ESsetG1;
1736                         return;
1737                 case '#':
1738                         vc->vc_state = EShash;
1739                         return;
1740                 case 'c':
1741                         reset_terminal(vc, 1);
1742                         return;
1743                 case '>':  /* Numeric keypad */
1744                         clr_kbd(vc, kbdapplic);
1745                         return;
1746                 case '=':  /* Appl. keypad */
1747                         set_kbd(vc, kbdapplic);
1748                         return;
1749                 }
1750                 return;
1751         case ESnonstd:
1752                 if (c=='P') {   /* palette escape sequence */
1753                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1754                                 vc->vc_par[vc->vc_npar] = 0;
1755                         vc->vc_npar = 0;
1756                         vc->vc_state = ESpalette;
1757                         return;
1758                 } else if (c=='R') {   /* reset palette */
1759                         reset_palette(vc);
1760                         vc->vc_state = ESnormal;
1761                 } else
1762                         vc->vc_state = ESnormal;
1763                 return;
1764         case ESpalette:
1765                 if (isxdigit(c)) {
1766                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1767                         if (vc->vc_npar == 7) {
1768                                 int i = vc->vc_par[0] * 3, j = 1;
1769                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1770                                 vc->vc_palette[i++] += vc->vc_par[j++];
1771                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1772                                 vc->vc_palette[i++] += vc->vc_par[j++];
1773                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1774                                 vc->vc_palette[i] += vc->vc_par[j];
1775                                 set_palette(vc);
1776                                 vc->vc_state = ESnormal;
1777                         }
1778                 } else
1779                         vc->vc_state = ESnormal;
1780                 return;
1781         case ESsquare:
1782                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1783                         vc->vc_par[vc->vc_npar] = 0;
1784                 vc->vc_npar = 0;
1785                 vc->vc_state = ESgetpars;
1786                 if (c == '[') { /* Function key */
1787                         vc->vc_state=ESfunckey;
1788                         return;
1789                 }
1790                 vc->vc_ques = (c == '?');
1791                 if (vc->vc_ques)
1792                         return;
1793         case ESgetpars:
1794                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1795                         vc->vc_npar++;
1796                         return;
1797                 } else if (c>='0' && c<='9') {
1798                         vc->vc_par[vc->vc_npar] *= 10;
1799                         vc->vc_par[vc->vc_npar] += c - '0';
1800                         return;
1801                 } else
1802                         vc->vc_state = ESgotpars;
1803         case ESgotpars:
1804                 vc->vc_state = ESnormal;
1805                 switch(c) {
1806                 case 'h':
1807                         set_mode(vc, 1);
1808                         return;
1809                 case 'l':
1810                         set_mode(vc, 0);
1811                         return;
1812                 case 'c':
1813                         if (vc->vc_ques) {
1814                                 if (vc->vc_par[0])
1815                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1816                                 else
1817                                         vc->vc_cursor_type = cur_default;
1818                                 return;
1819                         }
1820                         break;
1821                 case 'm':
1822                         if (vc->vc_ques) {
1823                                 clear_selection();
1824                                 if (vc->vc_par[0])
1825                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1826                                 else
1827                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1828                                 return;
1829                         }
1830                         break;
1831                 case 'n':
1832                         if (!vc->vc_ques) {
1833                                 if (vc->vc_par[0] == 5)
1834                                         status_report(tty);
1835                                 else if (vc->vc_par[0] == 6)
1836                                         cursor_report(vc, tty);
1837                         }
1838                         return;
1839                 }
1840                 if (vc->vc_ques) {
1841                         vc->vc_ques = 0;
1842                         return;
1843                 }
1844                 switch(c) {
1845                 case 'G': case '`':
1846                         if (vc->vc_par[0])
1847                                 vc->vc_par[0]--;
1848                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1849                         return;
1850                 case 'A':
1851                         if (!vc->vc_par[0])
1852                                 vc->vc_par[0]++;
1853                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1854                         return;
1855                 case 'B': case 'e':
1856                         if (!vc->vc_par[0])
1857                                 vc->vc_par[0]++;
1858                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1859                         return;
1860                 case 'C': case 'a':
1861                         if (!vc->vc_par[0])
1862                                 vc->vc_par[0]++;
1863                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1864                         return;
1865                 case 'D':
1866                         if (!vc->vc_par[0])
1867                                 vc->vc_par[0]++;
1868                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1869                         return;
1870                 case 'E':
1871                         if (!vc->vc_par[0])
1872                                 vc->vc_par[0]++;
1873                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1874                         return;
1875                 case 'F':
1876                         if (!vc->vc_par[0])
1877                                 vc->vc_par[0]++;
1878                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1879                         return;
1880                 case 'd':
1881                         if (vc->vc_par[0])
1882                                 vc->vc_par[0]--;
1883                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1884                         return;
1885                 case 'H': case 'f':
1886                         if (vc->vc_par[0])
1887                                 vc->vc_par[0]--;
1888                         if (vc->vc_par[1])
1889                                 vc->vc_par[1]--;
1890                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1891                         return;
1892                 case 'J':
1893                         csi_J(vc, vc->vc_par[0]);
1894                         return;
1895                 case 'K':
1896                         csi_K(vc, vc->vc_par[0]);
1897                         return;
1898                 case 'L':
1899                         csi_L(vc, vc->vc_par[0]);
1900                         return;
1901                 case 'M':
1902                         csi_M(vc, vc->vc_par[0]);
1903                         return;
1904                 case 'P':
1905                         csi_P(vc, vc->vc_par[0]);
1906                         return;
1907                 case 'c':
1908                         if (!vc->vc_par[0])
1909                                 respond_ID(tty);
1910                         return;
1911                 case 'g':
1912                         if (!vc->vc_par[0])
1913                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1914                         else if (vc->vc_par[0] == 3) {
1915                                 vc->vc_tab_stop[0] =
1916                                         vc->vc_tab_stop[1] =
1917                                         vc->vc_tab_stop[2] =
1918                                         vc->vc_tab_stop[3] =
1919                                         vc->vc_tab_stop[4] =
1920                                         vc->vc_tab_stop[5] =
1921                                         vc->vc_tab_stop[6] =
1922                                         vc->vc_tab_stop[7] = 0;
1923                         }
1924                         return;
1925                 case 'm':
1926                         csi_m(vc);
1927                         return;
1928                 case 'q': /* DECLL - but only 3 leds */
1929                         /* map 0,1,2,3 to 0,1,2,4 */
1930                         if (vc->vc_par[0] < 4)
1931                                 vt_set_led_state(vc->vc_num,
1932                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1933                         return;
1934                 case 'r':
1935                         if (!vc->vc_par[0])
1936                                 vc->vc_par[0]++;
1937                         if (!vc->vc_par[1])
1938                                 vc->vc_par[1] = vc->vc_rows;
1939                         /* Minimum allowed region is 2 lines */
1940                         if (vc->vc_par[0] < vc->vc_par[1] &&
1941                             vc->vc_par[1] <= vc->vc_rows) {
1942                                 vc->vc_top = vc->vc_par[0] - 1;
1943                                 vc->vc_bottom = vc->vc_par[1];
1944                                 gotoxay(vc, 0, 0);
1945                         }
1946                         return;
1947                 case 's':
1948                         save_cur(vc);
1949                         return;
1950                 case 'u':
1951                         restore_cur(vc);
1952                         return;
1953                 case 'X':
1954                         csi_X(vc, vc->vc_par[0]);
1955                         return;
1956                 case '@':
1957                         csi_at(vc, vc->vc_par[0]);
1958                         return;
1959                 case ']': /* setterm functions */
1960                         setterm_command(vc);
1961                         return;
1962                 }
1963                 return;
1964         case ESpercent:
1965                 vc->vc_state = ESnormal;
1966                 switch (c) {
1967                 case '@':  /* defined in ISO 2022 */
1968                         vc->vc_utf = 0;
1969                         return;
1970                 case 'G':  /* prelim official escape code */
1971                 case '8':  /* retained for compatibility */
1972                         vc->vc_utf = 1;
1973                         return;
1974                 }
1975                 return;
1976         case ESfunckey:
1977                 vc->vc_state = ESnormal;
1978                 return;
1979         case EShash:
1980                 vc->vc_state = ESnormal;
1981                 if (c == '8') {
1982                         /* DEC screen alignment test. kludge :-) */
1983                         vc->vc_video_erase_char =
1984                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1985                         csi_J(vc, 2);
1986                         vc->vc_video_erase_char =
1987                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1988                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1989                 }
1990                 return;
1991         case ESsetG0:
1992                 if (c == '0')
1993                         vc->vc_G0_charset = GRAF_MAP;
1994                 else if (c == 'B')
1995                         vc->vc_G0_charset = LAT1_MAP;
1996                 else if (c == 'U')
1997                         vc->vc_G0_charset = IBMPC_MAP;
1998                 else if (c == 'K')
1999                         vc->vc_G0_charset = USER_MAP;
2000                 if (vc->vc_charset == 0)
2001                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2002                 vc->vc_state = ESnormal;
2003                 return;
2004         case ESsetG1:
2005                 if (c == '0')
2006                         vc->vc_G1_charset = GRAF_MAP;
2007                 else if (c == 'B')
2008                         vc->vc_G1_charset = LAT1_MAP;
2009                 else if (c == 'U')
2010                         vc->vc_G1_charset = IBMPC_MAP;
2011                 else if (c == 'K')
2012                         vc->vc_G1_charset = USER_MAP;
2013                 if (vc->vc_charset == 1)
2014                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2015                 vc->vc_state = ESnormal;
2016                 return;
2017         default:
2018                 vc->vc_state = ESnormal;
2019         }
2020 }
2021
2022 /* is_double_width() is based on the wcwidth() implementation by
2023  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2024  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2025  */
2026 struct interval {
2027         uint32_t first;
2028         uint32_t last;
2029 };
2030
2031 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2032 {
2033         int min = 0;
2034         int mid;
2035
2036         if (ucs < table[0].first || ucs > table[max].last)
2037                 return 0;
2038         while (max >= min) {
2039                 mid = (min + max) / 2;
2040                 if (ucs > table[mid].last)
2041                         min = mid + 1;
2042                 else if (ucs < table[mid].first)
2043                         max = mid - 1;
2044                 else
2045                         return 1;
2046         }
2047         return 0;
2048 }
2049
2050 static int is_double_width(uint32_t ucs)
2051 {
2052         static const struct interval double_width[] = {
2053                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2054                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2055                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2056                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2057         };
2058         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2059 }
2060
2061 /* acquires console_lock */
2062 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2063 {
2064 #ifdef VT_BUF_VRAM_ONLY
2065 #define FLUSH do { } while(0);
2066 #else
2067 #define FLUSH if (draw_x >= 0) { \
2068         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2069         draw_x = -1; \
2070         }
2071 #endif
2072
2073         int c, tc, ok, n = 0, draw_x = -1;
2074         unsigned int currcons;
2075         unsigned long draw_from = 0, draw_to = 0;
2076         struct vc_data *vc;
2077         unsigned char vc_attr;
2078         struct vt_notifier_param param;
2079         uint8_t rescan;
2080         uint8_t inverse;
2081         uint8_t width;
2082         u16 himask, charmask;
2083
2084         if (in_interrupt())
2085                 return count;
2086
2087         might_sleep();
2088
2089         console_lock();
2090         vc = tty->driver_data;
2091         if (vc == NULL) {
2092                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2093                 console_unlock();
2094                 return 0;
2095         }
2096
2097         currcons = vc->vc_num;
2098         if (!vc_cons_allocated(currcons)) {
2099                 /* could this happen? */
2100                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2101                 console_unlock();
2102                 return 0;
2103         }
2104
2105         himask = vc->vc_hi_font_mask;
2106         charmask = himask ? 0x1ff : 0xff;
2107
2108         /* undraw cursor first */
2109         if (IS_FG(vc))
2110                 hide_cursor(vc);
2111
2112         param.vc = vc;
2113
2114         while (!tty->stopped && count) {
2115                 int orig = *buf;
2116                 c = orig;
2117                 buf++;
2118                 n++;
2119                 count--;
2120                 rescan = 0;
2121                 inverse = 0;
2122                 width = 1;
2123
2124                 /* Do no translation at all in control states */
2125                 if (vc->vc_state != ESnormal) {
2126                         tc = c;
2127                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2128                     /* Combine UTF-8 into Unicode in vc_utf_char.
2129                      * vc_utf_count is the number of continuation bytes still
2130                      * expected to arrive.
2131                      * vc_npar is the number of continuation bytes arrived so
2132                      * far
2133                      */
2134 rescan_last_byte:
2135                     if ((c & 0xc0) == 0x80) {
2136                         /* Continuation byte received */
2137                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2138                         if (vc->vc_utf_count) {
2139                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2140                             vc->vc_npar++;
2141                             if (--vc->vc_utf_count) {
2142                                 /* Still need some bytes */
2143                                 continue;
2144                             }
2145                             /* Got a whole character */
2146                             c = vc->vc_utf_char;
2147                             /* Reject overlong sequences */
2148                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2149                                         c > utf8_length_changes[vc->vc_npar])
2150                                 c = 0xfffd;
2151                         } else {
2152                             /* Unexpected continuation byte */
2153                             vc->vc_utf_count = 0;
2154                             c = 0xfffd;
2155                         }
2156                     } else {
2157                         /* Single ASCII byte or first byte of a sequence received */
2158                         if (vc->vc_utf_count) {
2159                             /* Continuation byte expected */
2160                             rescan = 1;
2161                             vc->vc_utf_count = 0;
2162                             c = 0xfffd;
2163                         } else if (c > 0x7f) {
2164                             /* First byte of a multibyte sequence received */
2165                             vc->vc_npar = 0;
2166                             if ((c & 0xe0) == 0xc0) {
2167                                 vc->vc_utf_count = 1;
2168                                 vc->vc_utf_char = (c & 0x1f);
2169                             } else if ((c & 0xf0) == 0xe0) {
2170                                 vc->vc_utf_count = 2;
2171                                 vc->vc_utf_char = (c & 0x0f);
2172                             } else if ((c & 0xf8) == 0xf0) {
2173                                 vc->vc_utf_count = 3;
2174                                 vc->vc_utf_char = (c & 0x07);
2175                             } else if ((c & 0xfc) == 0xf8) {
2176                                 vc->vc_utf_count = 4;
2177                                 vc->vc_utf_char = (c & 0x03);
2178                             } else if ((c & 0xfe) == 0xfc) {
2179                                 vc->vc_utf_count = 5;
2180                                 vc->vc_utf_char = (c & 0x01);
2181                             } else {
2182                                 /* 254 and 255 are invalid */
2183                                 c = 0xfffd;
2184                             }
2185                             if (vc->vc_utf_count) {
2186                                 /* Still need some bytes */
2187                                 continue;
2188                             }
2189                         }
2190                         /* Nothing to do if an ASCII byte was received */
2191                     }
2192                     /* End of UTF-8 decoding. */
2193                     /* c is the received character, or U+FFFD for invalid sequences. */
2194                     /* Replace invalid Unicode code points with U+FFFD too */
2195                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2196                         c = 0xfffd;
2197                     tc = c;
2198                 } else {        /* no utf or alternate charset mode */
2199                     tc = vc_translate(vc, c);
2200                 }
2201
2202                 param.c = tc;
2203                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2204                                         &param) == NOTIFY_STOP)
2205                         continue;
2206
2207                 /* If the original code was a control character we
2208                  * only allow a glyph to be displayed if the code is
2209                  * not normally used (such as for cursor movement) or
2210                  * if the disp_ctrl mode has been explicitly enabled.
2211                  * Certain characters (as given by the CTRL_ALWAYS
2212                  * bitmap) are always displayed as control characters,
2213                  * as the console would be pretty useless without
2214                  * them; to display an arbitrary font position use the
2215                  * direct-to-font zone in UTF-8 mode.
2216                  */
2217                 ok = tc && (c >= 32 ||
2218                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2219                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2220                         && (c != 127 || vc->vc_disp_ctrl)
2221                         && (c != 128+27);
2222
2223                 if (vc->vc_state == ESnormal && ok) {
2224                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2225                                 if (is_double_width(c))
2226                                         width = 2;
2227                         }
2228                         /* Now try to find out how to display it */
2229                         tc = conv_uni_to_pc(vc, tc);
2230                         if (tc & ~charmask) {
2231                                 if (tc == -1 || tc == -2) {
2232                                     continue; /* nothing to display */
2233                                 }
2234                                 /* Glyph not found */
2235                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2236                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2237                                        This would make absolutely no sense with Unicode in mind,
2238                                        but do this for ASCII characters since a font may lack
2239                                        Unicode mapping info and we don't want to end up with
2240                                        having question marks only. */
2241                                     tc = c;
2242                                 } else {
2243                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2244                                     tc = conv_uni_to_pc(vc, 0xfffd);
2245                                     if (tc < 0) {
2246                                         inverse = 1;
2247                                         tc = conv_uni_to_pc(vc, '?');
2248                                         if (tc < 0) tc = '?';
2249                                     }
2250                                 }
2251                         }
2252
2253                         if (!inverse) {
2254                                 vc_attr = vc->vc_attr;
2255                         } else {
2256                                 /* invert vc_attr */
2257                                 if (!vc->vc_can_do_color) {
2258                                         vc_attr = (vc->vc_attr) ^ 0x08;
2259                                 } else if (vc->vc_hi_font_mask == 0x100) {
2260                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2261                                 } else {
2262                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2263                                 }
2264                                 FLUSH
2265                         }
2266
2267                         while (1) {
2268                                 if (vc->vc_need_wrap || vc->vc_decim)
2269                                         FLUSH
2270                                 if (vc->vc_need_wrap) {
2271                                         cr(vc);
2272                                         lf(vc);
2273                                 }
2274                                 if (vc->vc_decim)
2275                                         insert_char(vc, 1);
2276                                 scr_writew(himask ?
2277                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2278                                              (vc_attr << 8) + tc,
2279                                            (u16 *) vc->vc_pos);
2280                                 if (DO_UPDATE(vc) && draw_x < 0) {
2281                                         draw_x = vc->vc_x;
2282                                         draw_from = vc->vc_pos;
2283                                 }
2284                                 if (vc->vc_x == vc->vc_cols - 1) {
2285                                         vc->vc_need_wrap = vc->vc_decawm;
2286                                         draw_to = vc->vc_pos + 2;
2287                                 } else {
2288                                         vc->vc_x++;
2289                                         draw_to = (vc->vc_pos += 2);
2290                                 }
2291
2292                                 if (!--width) break;
2293
2294                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2295                                 if (tc < 0) tc = ' ';
2296                         }
2297                         notify_write(vc, c);
2298
2299                         if (inverse) {
2300                                 FLUSH
2301                         }
2302
2303                         if (rescan) {
2304                                 rescan = 0;
2305                                 inverse = 0;
2306                                 width = 1;
2307                                 c = orig;
2308                                 goto rescan_last_byte;
2309                         }
2310                         continue;
2311                 }
2312                 FLUSH
2313                 do_con_trol(tty, vc, orig);
2314         }
2315         FLUSH
2316         console_conditional_schedule();
2317         console_unlock();
2318         notify_update(vc);
2319         return n;
2320 #undef FLUSH
2321 }
2322
2323 /*
2324  * This is the console switching callback.
2325  *
2326  * Doing console switching in a process context allows
2327  * us to do the switches asynchronously (needed when we want
2328  * to switch due to a keyboard interrupt).  Synchronization
2329  * with other console code and prevention of re-entrancy is
2330  * ensured with console_lock.
2331  */
2332 static void console_callback(struct work_struct *ignored)
2333 {
2334         console_lock();
2335
2336         if (want_console >= 0) {
2337                 if (want_console != fg_console &&
2338                     vc_cons_allocated(want_console)) {
2339                         hide_cursor(vc_cons[fg_console].d);
2340                         change_console(vc_cons[want_console].d);
2341                         /* we only changed when the console had already
2342                            been allocated - a new console is not created
2343                            in an interrupt routine */
2344                 }
2345                 want_console = -1;
2346         }
2347         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2348                 do_poke_blanked_console = 0;
2349                 poke_blanked_console();
2350         }
2351         if (scrollback_delta) {
2352                 struct vc_data *vc = vc_cons[fg_console].d;
2353                 clear_selection();
2354                 if (vc->vc_mode == KD_TEXT)
2355                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2356                 scrollback_delta = 0;
2357         }
2358         if (blank_timer_expired) {
2359                 do_blank_screen(0);
2360                 blank_timer_expired = 0;
2361         }
2362         notify_update(vc_cons[fg_console].d);
2363
2364         console_unlock();
2365 }
2366
2367 int set_console(int nr)
2368 {
2369         struct vc_data *vc = vc_cons[fg_console].d;
2370
2371         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2372                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2373
2374                 /*
2375                  * Console switch will fail in console_callback() or
2376                  * change_console() so there is no point scheduling
2377                  * the callback
2378                  *
2379                  * Existing set_console() users don't check the return
2380                  * value so this shouldn't break anything
2381                  */
2382                 return -EINVAL;
2383         }
2384
2385         want_console = nr;
2386         schedule_console_callback();
2387
2388         return 0;
2389 }
2390
2391 struct tty_driver *console_driver;
2392
2393 #ifdef CONFIG_VT_CONSOLE
2394
2395 /**
2396  * vt_kmsg_redirect() - Sets/gets the kernel message console
2397  * @new:        The new virtual terminal number or -1 if the console should stay
2398  *              unchanged
2399  *
2400  * By default, the kernel messages are always printed on the current virtual
2401  * console. However, the user may modify that default with the
2402  * TIOCL_SETKMSGREDIRECT ioctl call.
2403  *
2404  * This function sets the kernel message console to be @new. It returns the old
2405  * virtual console number. The virtual terminal number 0 (both as parameter and
2406  * return value) means no redirection (i.e. always printed on the currently
2407  * active console).
2408  *
2409  * The parameter -1 means that only the current console is returned, but the
2410  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2411  * case to make the code more understandable.
2412  *
2413  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2414  * the parameter and always returns 0.
2415  */
2416 int vt_kmsg_redirect(int new)
2417 {
2418         static int kmsg_con;
2419
2420         if (new != -1)
2421                 return xchg(&kmsg_con, new);
2422         else
2423                 return kmsg_con;
2424 }
2425
2426 /*
2427  *      Console on virtual terminal
2428  *
2429  * The console must be locked when we get here.
2430  */
2431
2432 static void vt_console_print(struct console *co, const char *b, unsigned count)
2433 {
2434         struct vc_data *vc = vc_cons[fg_console].d;
2435         unsigned char c;
2436         static DEFINE_SPINLOCK(printing_lock);
2437         const ushort *start;
2438         ushort cnt = 0;
2439         ushort myx;
2440         int kmsg_console;
2441
2442         /* console busy or not yet initialized */
2443         if (!printable)
2444                 return;
2445         if (!spin_trylock(&printing_lock))
2446                 return;
2447
2448         kmsg_console = vt_get_kmsg_redirect();
2449         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2450                 vc = vc_cons[kmsg_console - 1].d;
2451
2452         /* read `x' only after setting currcons properly (otherwise
2453            the `x' macro will read the x of the foreground console). */
2454         myx = vc->vc_x;
2455
2456         if (!vc_cons_allocated(fg_console)) {
2457                 /* impossible */
2458                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2459                 goto quit;
2460         }
2461
2462         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2463                 goto quit;
2464
2465         /* undraw cursor first */
2466         if (IS_FG(vc))
2467                 hide_cursor(vc);
2468
2469         start = (ushort *)vc->vc_pos;
2470
2471         /* Contrived structure to try to emulate original need_wrap behaviour
2472          * Problems caused when we have need_wrap set on '\n' character */
2473         while (count--) {
2474                 c = *b++;
2475                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2476                         if (cnt > 0) {
2477                                 if (CON_IS_VISIBLE(vc))
2478                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2479                                 vc->vc_x += cnt;
2480                                 if (vc->vc_need_wrap)
2481                                         vc->vc_x--;
2482                                 cnt = 0;
2483                         }
2484                         if (c == 8) {           /* backspace */
2485                                 bs(vc);
2486                                 start = (ushort *)vc->vc_pos;
2487                                 myx = vc->vc_x;
2488                                 continue;
2489                         }
2490                         if (c != 13)
2491                                 lf(vc);
2492                         cr(vc);
2493                         start = (ushort *)vc->vc_pos;
2494                         myx = vc->vc_x;
2495                         if (c == 10 || c == 13)
2496                                 continue;
2497                 }
2498                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2499                 notify_write(vc, c);
2500                 cnt++;
2501                 if (myx == vc->vc_cols - 1) {
2502                         vc->vc_need_wrap = 1;
2503                         continue;
2504                 }
2505                 vc->vc_pos += 2;
2506                 myx++;
2507         }
2508         if (cnt > 0) {
2509                 if (CON_IS_VISIBLE(vc))
2510                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2511                 vc->vc_x += cnt;
2512                 if (vc->vc_x == vc->vc_cols) {
2513                         vc->vc_x--;
2514                         vc->vc_need_wrap = 1;
2515                 }
2516         }
2517         set_cursor(vc);
2518         notify_update(vc);
2519
2520 quit:
2521         spin_unlock(&printing_lock);
2522 }
2523
2524 static struct tty_driver *vt_console_device(struct console *c, int *index)
2525 {
2526         *index = c->index ? c->index-1 : fg_console;
2527         return console_driver;
2528 }
2529
2530 static struct console vt_console_driver = {
2531         .name           = "tty",
2532         .write          = vt_console_print,
2533         .device         = vt_console_device,
2534         .unblank        = unblank_screen,
2535         .flags          = CON_PRINTBUFFER,
2536         .index          = -1,
2537 };
2538 #endif
2539
2540 /*
2541  *      Handling of Linux-specific VC ioctls
2542  */
2543
2544 /*
2545  * Generally a bit racy with respect to console_lock();.
2546  *
2547  * There are some functions which don't need it.
2548  *
2549  * There are some functions which can sleep for arbitrary periods
2550  * (paste_selection) but we don't need the lock there anyway.
2551  *
2552  * set_selection has locking, and definitely needs it
2553  */
2554
2555 int tioclinux(struct tty_struct *tty, unsigned long arg)
2556 {
2557         char type, data;
2558         char __user *p = (char __user *)arg;
2559         int lines;
2560         int ret;
2561
2562         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2563                 return -EPERM;
2564         if (get_user(type, p))
2565                 return -EFAULT;
2566         ret = 0;
2567
2568         switch (type)
2569         {
2570                 case TIOCL_SETSEL:
2571                         console_lock();
2572                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2573                         console_unlock();
2574                         break;
2575                 case TIOCL_PASTESEL:
2576                         ret = paste_selection(tty);
2577                         break;
2578                 case TIOCL_UNBLANKSCREEN:
2579                         console_lock();
2580                         unblank_screen();
2581                         console_unlock();
2582                         break;
2583                 case TIOCL_SELLOADLUT:
2584                         console_lock();
2585                         ret = sel_loadlut(p);
2586                         console_unlock();
2587                         break;
2588                 case TIOCL_GETSHIFTSTATE:
2589
2590         /*
2591          * Make it possible to react to Shift+Mousebutton.
2592          * Note that 'shift_state' is an undocumented
2593          * kernel-internal variable; programs not closely
2594          * related to the kernel should not use this.
2595          */
2596                         data = vt_get_shift_state();
2597                         ret = __put_user(data, p);
2598                         break;
2599                 case TIOCL_GETMOUSEREPORTING:
2600                         console_lock(); /* May be overkill */
2601                         data = mouse_reporting();
2602                         console_unlock();
2603                         ret = __put_user(data, p);
2604                         break;
2605                 case TIOCL_SETVESABLANK:
2606                         console_lock();
2607                         ret = set_vesa_blanking(p);
2608                         console_unlock();
2609                         break;
2610                 case TIOCL_GETKMSGREDIRECT:
2611                         data = vt_get_kmsg_redirect();
2612                         ret = __put_user(data, p);
2613                         break;
2614                 case TIOCL_SETKMSGREDIRECT:
2615                         if (!capable(CAP_SYS_ADMIN)) {
2616                                 ret = -EPERM;
2617                         } else {
2618                                 if (get_user(data, p+1))
2619                                         ret = -EFAULT;
2620                                 else
2621                                         vt_kmsg_redirect(data);
2622                         }
2623                         break;
2624                 case TIOCL_GETFGCONSOLE:
2625                         /* No locking needed as this is a transiently
2626                            correct return anyway if the caller hasn't
2627                            disabled switching */
2628                         ret = fg_console;
2629                         break;
2630                 case TIOCL_SCROLLCONSOLE:
2631                         if (get_user(lines, (s32 __user *)(p+4))) {
2632                                 ret = -EFAULT;
2633                         } else {
2634                                 /* Need the console lock here. Note that lots
2635                                    of other calls need fixing before the lock
2636                                    is actually useful ! */
2637                                 console_lock();
2638                                 scrollfront(vc_cons[fg_console].d, lines);
2639                                 console_unlock();
2640                                 ret = 0;
2641                         }
2642                         break;
2643                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2644                         console_lock();
2645                         ignore_poke = 1;
2646                         do_blank_screen(0);
2647                         console_unlock();
2648                         break;
2649                 case TIOCL_BLANKEDSCREEN:
2650                         ret = console_blanked;
2651                         break;
2652                 default:
2653                         ret = -EINVAL;
2654                         break;
2655         }
2656         return ret;
2657 }
2658
2659 /*
2660  * /dev/ttyN handling
2661  */
2662
2663 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2664 {
2665         int     retval;
2666
2667         retval = do_con_write(tty, buf, count);
2668         con_flush_chars(tty);
2669
2670         return retval;
2671 }
2672
2673 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2674 {
2675         if (in_interrupt())
2676                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2677         return do_con_write(tty, &ch, 1);
2678 }
2679
2680 static int con_write_room(struct tty_struct *tty)
2681 {
2682         if (tty->stopped)
2683                 return 0;
2684         return 32768;           /* No limit, really; we're not buffering */
2685 }
2686
2687 static int con_chars_in_buffer(struct tty_struct *tty)
2688 {
2689         return 0;               /* we're not buffering */
2690 }
2691
2692 /*
2693  * con_throttle and con_unthrottle are only used for
2694  * paste_selection(), which has to stuff in a large number of
2695  * characters...
2696  */
2697 static void con_throttle(struct tty_struct *tty)
2698 {
2699 }
2700
2701 static void con_unthrottle(struct tty_struct *tty)
2702 {
2703         struct vc_data *vc = tty->driver_data;
2704
2705         wake_up_interruptible(&vc->paste_wait);
2706 }
2707
2708 /*
2709  * Turn the Scroll-Lock LED on when the tty is stopped
2710  */
2711 static void con_stop(struct tty_struct *tty)
2712 {
2713         int console_num;
2714         if (!tty)
2715                 return;
2716         console_num = tty->index;
2717         if (!vc_cons_allocated(console_num))
2718                 return;
2719         vt_kbd_con_stop(console_num);
2720 }
2721
2722 /*
2723  * Turn the Scroll-Lock LED off when the console is started
2724  */
2725 static void con_start(struct tty_struct *tty)
2726 {
2727         int console_num;
2728         if (!tty)
2729                 return;
2730         console_num = tty->index;
2731         if (!vc_cons_allocated(console_num))
2732                 return;
2733         vt_kbd_con_start(console_num);
2734 }
2735
2736 static void con_flush_chars(struct tty_struct *tty)
2737 {
2738         struct vc_data *vc;
2739
2740         if (in_interrupt())     /* from flush_to_ldisc */
2741                 return;
2742
2743         /* if we race with con_close(), vt may be null */
2744         console_lock();
2745         vc = tty->driver_data;
2746         if (vc)
2747                 set_cursor(vc);
2748         console_unlock();
2749 }
2750
2751 /*
2752  * Allocate the console screen memory.
2753  */
2754 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2755 {
2756         unsigned int currcons = tty->index;
2757         struct vc_data *vc;
2758         int ret;
2759
2760         console_lock();
2761         ret = vc_allocate(currcons);
2762         if (ret)
2763                 goto unlock;
2764
2765         vc = vc_cons[currcons].d;
2766
2767         /* Still being freed */
2768         if (vc->port.tty) {
2769                 ret = -ERESTARTSYS;
2770                 goto unlock;
2771         }
2772
2773         ret = tty_port_install(&vc->port, driver, tty);
2774         if (ret)
2775                 goto unlock;
2776
2777         tty->driver_data = vc;
2778         vc->port.tty = tty;
2779
2780         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2781                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2782                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2783         }
2784         if (vc->vc_utf)
2785                 tty->termios.c_iflag |= IUTF8;
2786         else
2787                 tty->termios.c_iflag &= ~IUTF8;
2788 unlock:
2789         console_unlock();
2790         return ret;
2791 }
2792
2793 static int con_open(struct tty_struct *tty, struct file *filp)
2794 {
2795         /* everything done in install */
2796         return 0;
2797 }
2798
2799
2800 static void con_close(struct tty_struct *tty, struct file *filp)
2801 {
2802         /* Nothing to do - we defer to shutdown */
2803 }
2804
2805 static void con_shutdown(struct tty_struct *tty)
2806 {
2807         struct vc_data *vc = tty->driver_data;
2808         BUG_ON(vc == NULL);
2809         console_lock();
2810         vc->port.tty = NULL;
2811         console_unlock();
2812 }
2813
2814 static int default_italic_color    = 2; // green (ASCII)
2815 static int default_underline_color = 3; // cyan (ASCII)
2816 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2817 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2818
2819 static void vc_init(struct vc_data *vc, unsigned int rows,
2820                     unsigned int cols, int do_clear)
2821 {
2822         int j, k ;
2823
2824         vc->vc_cols = cols;
2825         vc->vc_rows = rows;
2826         vc->vc_size_row = cols << 1;
2827         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2828
2829         set_origin(vc);
2830         vc->vc_pos = vc->vc_origin;
2831         reset_vc(vc);
2832         for (j=k=0; j<16; j++) {
2833                 vc->vc_palette[k++] = default_red[j] ;
2834                 vc->vc_palette[k++] = default_grn[j] ;
2835                 vc->vc_palette[k++] = default_blu[j] ;
2836         }
2837         vc->vc_def_color       = 0x07;   /* white */
2838         vc->vc_ulcolor         = default_underline_color;
2839         vc->vc_itcolor         = default_italic_color;
2840         vc->vc_halfcolor       = 0x08;   /* grey */
2841         init_waitqueue_head(&vc->paste_wait);
2842         reset_terminal(vc, do_clear);
2843 }
2844
2845 /*
2846  * This routine initializes console interrupts, and does nothing
2847  * else. If you want the screen to clear, call tty_write with
2848  * the appropriate escape-sequence.
2849  */
2850
2851 static int __init con_init(void)
2852 {
2853         const char *display_desc = NULL;
2854         struct vc_data *vc;
2855         unsigned int currcons = 0, i;
2856
2857         console_lock();
2858
2859         if (conswitchp)
2860                 display_desc = conswitchp->con_startup();
2861         if (!display_desc) {
2862                 fg_console = 0;
2863                 console_unlock();
2864                 return 0;
2865         }
2866
2867         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2868                 struct con_driver *con_driver = &registered_con_driver[i];
2869
2870                 if (con_driver->con == NULL) {
2871                         con_driver->con = conswitchp;
2872                         con_driver->desc = display_desc;
2873                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2874                         con_driver->first = 0;
2875                         con_driver->last = MAX_NR_CONSOLES - 1;
2876                         break;
2877                 }
2878         }
2879
2880         for (i = 0; i < MAX_NR_CONSOLES; i++)
2881                 con_driver_map[i] = conswitchp;
2882
2883         if (blankinterval) {
2884                 blank_state = blank_normal_wait;
2885                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2886         }
2887
2888         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2889                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2890                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2891                 tty_port_init(&vc->port);
2892                 visual_init(vc, currcons, 1);
2893                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2894                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2895                         currcons || !vc->vc_sw->con_save_screen);
2896         }
2897         currcons = fg_console = 0;
2898         master_display_fg = vc = vc_cons[currcons].d;
2899         set_origin(vc);
2900         save_screen(vc);
2901         gotoxy(vc, vc->vc_x, vc->vc_y);
2902         csi_J(vc, 0);
2903         update_screen(vc);
2904         pr_info("Console: %s %s %dx%d\n",
2905                 vc->vc_can_do_color ? "colour" : "mono",
2906                 display_desc, vc->vc_cols, vc->vc_rows);
2907         printable = 1;
2908
2909         console_unlock();
2910
2911 #ifdef CONFIG_VT_CONSOLE
2912         register_console(&vt_console_driver);
2913 #endif
2914         return 0;
2915 }
2916 console_initcall(con_init);
2917
2918 static const struct tty_operations con_ops = {
2919         .install = con_install,
2920         .open = con_open,
2921         .close = con_close,
2922         .write = con_write,
2923         .write_room = con_write_room,
2924         .put_char = con_put_char,
2925         .flush_chars = con_flush_chars,
2926         .chars_in_buffer = con_chars_in_buffer,
2927         .ioctl = vt_ioctl,
2928 #ifdef CONFIG_COMPAT
2929         .compat_ioctl = vt_compat_ioctl,
2930 #endif
2931         .stop = con_stop,
2932         .start = con_start,
2933         .throttle = con_throttle,
2934         .unthrottle = con_unthrottle,
2935         .resize = vt_resize,
2936         .shutdown = con_shutdown
2937 };
2938
2939 static struct cdev vc0_cdev;
2940
2941 static ssize_t show_tty_active(struct device *dev,
2942                                 struct device_attribute *attr, char *buf)
2943 {
2944         return sprintf(buf, "tty%d\n", fg_console + 1);
2945 }
2946 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2947
2948 int __init vty_init(const struct file_operations *console_fops)
2949 {
2950         cdev_init(&vc0_cdev, console_fops);
2951         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2952             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2953                 panic("Couldn't register /dev/tty0 driver\n");
2954         tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2955         if (IS_ERR(tty0dev))
2956                 tty0dev = NULL;
2957         else
2958                 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2959
2960         vcs_init();
2961
2962         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2963         if (!console_driver)
2964                 panic("Couldn't allocate console driver\n");
2965
2966         console_driver->name = "tty";
2967         console_driver->name_base = 1;
2968         console_driver->major = TTY_MAJOR;
2969         console_driver->minor_start = 1;
2970         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2971         console_driver->init_termios = tty_std_termios;
2972         if (default_utf8)
2973                 console_driver->init_termios.c_iflag |= IUTF8;
2974         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2975         tty_set_operations(console_driver, &con_ops);
2976         if (tty_register_driver(console_driver))
2977                 panic("Couldn't register console driver\n");
2978         kbd_init();
2979         console_map_init();
2980 #ifdef CONFIG_MDA_CONSOLE
2981         mda_console_init();
2982 #endif
2983         return 0;
2984 }
2985
2986 #ifndef VT_SINGLE_DRIVER
2987
2988 static struct class *vtconsole_class;
2989
2990 static int do_bind_con_driver(const struct consw *csw, int first, int last,
2991                            int deflt)
2992 {
2993         struct module *owner = csw->owner;
2994         const char *desc = NULL;
2995         struct con_driver *con_driver;
2996         int i, j = -1, k = -1, retval = -ENODEV;
2997
2998         if (!try_module_get(owner))
2999                 return -ENODEV;
3000
3001         WARN_CONSOLE_UNLOCKED();
3002
3003         /* check if driver is registered */
3004         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3005                 con_driver = &registered_con_driver[i];
3006
3007                 if (con_driver->con == csw) {
3008                         desc = con_driver->desc;
3009                         retval = 0;
3010                         break;
3011                 }
3012         }
3013
3014         if (retval)
3015                 goto err;
3016
3017         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3018                 csw->con_startup();
3019                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3020         }
3021
3022         if (deflt) {
3023                 if (conswitchp)
3024                         module_put(conswitchp->owner);
3025
3026                 __module_get(owner);
3027                 conswitchp = csw;
3028         }
3029
3030         first = max(first, con_driver->first);
3031         last = min(last, con_driver->last);
3032
3033         for (i = first; i <= last; i++) {
3034                 int old_was_color;
3035                 struct vc_data *vc = vc_cons[i].d;
3036
3037                 if (con_driver_map[i])
3038                         module_put(con_driver_map[i]->owner);
3039                 __module_get(owner);
3040                 con_driver_map[i] = csw;
3041
3042                 if (!vc || !vc->vc_sw)
3043                         continue;
3044
3045                 j = i;
3046
3047                 if (CON_IS_VISIBLE(vc)) {
3048                         k = i;
3049                         save_screen(vc);
3050                 }
3051
3052                 old_was_color = vc->vc_can_do_color;
3053                 vc->vc_sw->con_deinit(vc);
3054                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3055                 visual_init(vc, i, 0);
3056                 set_origin(vc);
3057                 update_attr(vc);
3058
3059                 /* If the console changed between mono <-> color, then
3060                  * the attributes in the screenbuf will be wrong.  The
3061                  * following resets all attributes to something sane.
3062                  */
3063                 if (old_was_color != vc->vc_can_do_color)
3064                         clear_buffer_attributes(vc);
3065         }
3066
3067         pr_info("Console: switching ");
3068         if (!deflt)
3069                 printk("consoles %d-%d ", first+1, last+1);
3070         if (j >= 0) {
3071                 struct vc_data *vc = vc_cons[j].d;
3072
3073                 printk("to %s %s %dx%d\n",
3074                        vc->vc_can_do_color ? "colour" : "mono",
3075                        desc, vc->vc_cols, vc->vc_rows);
3076
3077                 if (k >= 0) {
3078                         vc = vc_cons[k].d;
3079                         update_screen(vc);
3080                 }
3081         } else
3082                 printk("to %s\n", desc);
3083
3084         retval = 0;
3085 err:
3086         module_put(owner);
3087         return retval;
3088 };
3089
3090
3091 static int bind_con_driver(const struct consw *csw, int first, int last,
3092                            int deflt)
3093 {
3094         int ret;
3095
3096         console_lock();
3097         ret = do_bind_con_driver(csw, first, last, deflt);
3098         console_unlock();
3099         return ret;
3100 }
3101
3102 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3103 static int con_is_graphics(const struct consw *csw, int first, int last)
3104 {
3105         int i, retval = 0;
3106
3107         for (i = first; i <= last; i++) {
3108                 struct vc_data *vc = vc_cons[i].d;
3109
3110                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3111                         retval = 1;
3112                         break;
3113                 }
3114         }
3115
3116         return retval;
3117 }
3118
3119 /**
3120  * unbind_con_driver - unbind a console driver
3121  * @csw: pointer to console driver to unregister
3122  * @first: first in range of consoles that @csw should be unbound from
3123  * @last: last in range of consoles that @csw should be unbound from
3124  * @deflt: should next bound console driver be default after @csw is unbound?
3125  *
3126  * To unbind a driver from all possible consoles, pass 0 as @first and
3127  * %MAX_NR_CONSOLES as @last.
3128  *
3129  * @deflt controls whether the console that ends up replacing @csw should be
3130  * the default console.
3131  *
3132  * RETURNS:
3133  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3134  * or 0 on success.
3135  */
3136 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3137 {
3138         int retval;
3139
3140         console_lock();
3141         retval = do_unbind_con_driver(csw, first, last, deflt);
3142         console_unlock();
3143         return retval;
3144 }
3145 EXPORT_SYMBOL(unbind_con_driver);
3146
3147 /* unlocked version of unbind_con_driver() */
3148 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3149 {
3150         struct module *owner = csw->owner;
3151         const struct consw *defcsw = NULL;
3152         struct con_driver *con_driver = NULL, *con_back = NULL;
3153         int i, retval = -ENODEV;
3154
3155         if (!try_module_get(owner))
3156                 return -ENODEV;
3157
3158         WARN_CONSOLE_UNLOCKED();
3159
3160         /* check if driver is registered and if it is unbindable */
3161         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3162                 con_driver = &registered_con_driver[i];
3163
3164                 if (con_driver->con == csw &&
3165                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3166                         retval = 0;
3167                         break;
3168                 }
3169         }
3170
3171         if (retval)
3172                 goto err;
3173
3174         retval = -ENODEV;
3175
3176         /* check if backup driver exists */
3177         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3178                 con_back = &registered_con_driver[i];
3179
3180                 if (con_back->con &&
3181                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3182                         defcsw = con_back->con;
3183                         retval = 0;
3184                         break;
3185                 }
3186         }
3187
3188         if (retval)
3189                 goto err;
3190
3191         if (!con_is_bound(csw))
3192                 goto err;
3193
3194         first = max(first, con_driver->first);
3195         last = min(last, con_driver->last);
3196
3197         for (i = first; i <= last; i++) {
3198                 if (con_driver_map[i] == csw) {
3199                         module_put(csw->owner);
3200                         con_driver_map[i] = NULL;
3201                 }
3202         }
3203
3204         if (!con_is_bound(defcsw)) {
3205                 const struct consw *defconsw = conswitchp;
3206
3207                 defcsw->con_startup();
3208                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3209                 /*
3210                  * vgacon may change the default driver to point
3211                  * to dummycon, we restore it here...
3212                  */
3213                 conswitchp = defconsw;
3214         }
3215
3216         if (!con_is_bound(csw))
3217                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3218
3219         /* ignore return value, binding should not fail */
3220         do_bind_con_driver(defcsw, first, last, deflt);
3221 err:
3222         module_put(owner);
3223         return retval;
3224
3225 }
3226 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3227
3228 static int vt_bind(struct con_driver *con)
3229 {
3230         const struct consw *defcsw = NULL, *csw = NULL;
3231         int i, more = 1, first = -1, last = -1, deflt = 0;
3232
3233         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3234             con_is_graphics(con->con, con->first, con->last))
3235                 goto err;
3236
3237         csw = con->con;
3238
3239         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3240                 struct con_driver *con = &registered_con_driver[i];
3241
3242                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3243                         defcsw = con->con;
3244                         break;
3245                 }
3246         }
3247
3248         if (!defcsw)
3249                 goto err;
3250
3251         while (more) {
3252                 more = 0;
3253
3254                 for (i = con->first; i <= con->last; i++) {
3255                         if (con_driver_map[i] == defcsw) {
3256                                 if (first == -1)
3257                                         first = i;
3258                                 last = i;
3259                                 more = 1;
3260                         } else if (first != -1)
3261                                 break;
3262                 }
3263
3264                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3265                         deflt = 1;
3266
3267                 if (first != -1)
3268                         bind_con_driver(csw, first, last, deflt);
3269
3270                 first = -1;
3271                 last = -1;
3272                 deflt = 0;
3273         }
3274
3275 err:
3276         return 0;
3277 }
3278
3279 static int vt_unbind(struct con_driver *con)
3280 {
3281         const struct consw *csw = NULL;
3282         int i, more = 1, first = -1, last = -1, deflt = 0;
3283
3284         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3285             con_is_graphics(con->con, con->first, con->last))
3286                 goto err;
3287
3288         csw = con->con;
3289
3290         while (more) {
3291                 more = 0;
3292
3293                 for (i = con->first; i <= con->last; i++) {
3294                         if (con_driver_map[i] == csw) {
3295                                 if (first == -1)
3296                                         first = i;
3297                                 last = i;
3298                                 more = 1;
3299                         } else if (first != -1)
3300                                 break;
3301                 }
3302
3303                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3304                         deflt = 1;
3305
3306                 if (first != -1)
3307                         unbind_con_driver(csw, first, last, deflt);
3308
3309                 first = -1;
3310                 last = -1;
3311                 deflt = 0;
3312         }
3313
3314 err:
3315         return 0;
3316 }
3317 #else
3318 static inline int vt_bind(struct con_driver *con)
3319 {
3320         return 0;
3321 }
3322 static inline int vt_unbind(struct con_driver *con)
3323 {
3324         return 0;
3325 }
3326 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3327
3328 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3329                           const char *buf, size_t count)
3330 {
3331         struct con_driver *con = dev_get_drvdata(dev);
3332         int bind = simple_strtoul(buf, NULL, 0);
3333
3334         if (bind)
3335                 vt_bind(con);
3336         else
3337                 vt_unbind(con);
3338
3339         return count;
3340 }
3341
3342 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3343                          char *buf)
3344 {
3345         struct con_driver *con = dev_get_drvdata(dev);
3346         int bind = con_is_bound(con->con);
3347
3348         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3349 }
3350
3351 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3352                          char *buf)
3353 {
3354         struct con_driver *con = dev_get_drvdata(dev);
3355
3356         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3357                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3358                          con->desc);
3359
3360 }
3361
3362 static struct device_attribute device_attrs[] = {
3363         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3364         __ATTR(name, S_IRUGO, show_name, NULL),
3365 };
3366
3367 static int vtconsole_init_device(struct con_driver *con)
3368 {
3369         int i;
3370         int error = 0;
3371
3372         con->flag |= CON_DRIVER_FLAG_ATTR;
3373         dev_set_drvdata(con->dev, con);
3374         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3375                 error = device_create_file(con->dev, &device_attrs[i]);
3376                 if (error)
3377                         break;
3378         }
3379
3380         if (error) {
3381                 while (--i >= 0)
3382                         device_remove_file(con->dev, &device_attrs[i]);
3383                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3384         }
3385
3386         return error;
3387 }
3388
3389 static void vtconsole_deinit_device(struct con_driver *con)
3390 {
3391         int i;
3392
3393         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3394                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3395                         device_remove_file(con->dev, &device_attrs[i]);
3396                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3397         }
3398 }
3399
3400 /**
3401  * con_is_bound - checks if driver is bound to the console
3402  * @csw: console driver
3403  *
3404  * RETURNS: zero if unbound, nonzero if bound
3405  *
3406  * Drivers can call this and if zero, they should release
3407  * all resources allocated on con_startup()
3408  */
3409 int con_is_bound(const struct consw *csw)
3410 {
3411         int i, bound = 0;
3412
3413         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3414                 if (con_driver_map[i] == csw) {
3415                         bound = 1;
3416                         break;
3417                 }
3418         }
3419
3420         return bound;
3421 }
3422 EXPORT_SYMBOL(con_is_bound);
3423
3424 /**
3425  * con_debug_enter - prepare the console for the kernel debugger
3426  * @sw: console driver
3427  *
3428  * Called when the console is taken over by the kernel debugger, this
3429  * function needs to save the current console state, then put the console
3430  * into a state suitable for the kernel debugger.
3431  *
3432  * RETURNS:
3433  * Zero on success, nonzero if a failure occurred when trying to prepare
3434  * the console for the debugger.
3435  */
3436 int con_debug_enter(struct vc_data *vc)
3437 {
3438         int ret = 0;
3439
3440         saved_fg_console = fg_console;
3441         saved_last_console = last_console;
3442         saved_want_console = want_console;
3443         saved_vc_mode = vc->vc_mode;
3444         saved_console_blanked = console_blanked;
3445         vc->vc_mode = KD_TEXT;
3446         console_blanked = 0;
3447         if (vc->vc_sw->con_debug_enter)
3448                 ret = vc->vc_sw->con_debug_enter(vc);
3449 #ifdef CONFIG_KGDB_KDB
3450         /* Set the initial LINES variable if it is not already set */
3451         if (vc->vc_rows < 999) {
3452                 int linecount;
3453                 char lns[4];
3454                 const char *setargs[3] = {
3455                         "set",
3456                         "LINES",
3457                         lns,
3458                 };
3459                 if (kdbgetintenv(setargs[0], &linecount)) {
3460                         snprintf(lns, 4, "%i", vc->vc_rows);
3461                         kdb_set(2, setargs);
3462                 }
3463         }
3464         if (vc->vc_cols < 999) {
3465                 int colcount;
3466                 char cols[4];
3467                 const char *setargs[3] = {
3468                         "set",
3469                         "COLUMNS",
3470                         cols,
3471                 };
3472                 if (kdbgetintenv(setargs[0], &colcount)) {
3473                         snprintf(cols, 4, "%i", vc->vc_cols);
3474                         kdb_set(2, setargs);
3475                 }
3476         }
3477 #endif /* CONFIG_KGDB_KDB */
3478         return ret;
3479 }
3480 EXPORT_SYMBOL_GPL(con_debug_enter);
3481
3482 /**
3483  * con_debug_leave - restore console state
3484  * @sw: console driver
3485  *
3486  * Restore the console state to what it was before the kernel debugger
3487  * was invoked.
3488  *
3489  * RETURNS:
3490  * Zero on success, nonzero if a failure occurred when trying to restore
3491  * the console.
3492  */
3493 int con_debug_leave(void)
3494 {
3495         struct vc_data *vc;
3496         int ret = 0;
3497
3498         fg_console = saved_fg_console;
3499         last_console = saved_last_console;
3500         want_console = saved_want_console;
3501         console_blanked = saved_console_blanked;
3502         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3503
3504         vc = vc_cons[fg_console].d;
3505         if (vc->vc_sw->con_debug_leave)
3506                 ret = vc->vc_sw->con_debug_leave(vc);
3507         return ret;
3508 }
3509 EXPORT_SYMBOL_GPL(con_debug_leave);
3510
3511 static int do_register_con_driver(const struct consw *csw, int first, int last)
3512 {
3513         struct module *owner = csw->owner;
3514         struct con_driver *con_driver;
3515         const char *desc;
3516         int i, retval = 0;
3517
3518         WARN_CONSOLE_UNLOCKED();
3519
3520         if (!try_module_get(owner))
3521                 return -ENODEV;
3522
3523         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3524                 con_driver = &registered_con_driver[i];
3525
3526                 /* already registered */
3527                 if (con_driver->con == csw)
3528                         retval = -EBUSY;
3529         }
3530
3531         if (retval)
3532                 goto err;
3533
3534         desc = csw->con_startup();
3535
3536         if (!desc)
3537                 goto err;
3538
3539         retval = -EINVAL;
3540
3541         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3542                 con_driver = &registered_con_driver[i];
3543
3544                 if (con_driver->con == NULL) {
3545                         con_driver->con = csw;
3546                         con_driver->desc = desc;
3547                         con_driver->node = i;
3548                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3549                                            CON_DRIVER_FLAG_INIT;
3550                         con_driver->first = first;
3551                         con_driver->last = last;
3552                         retval = 0;
3553                         break;
3554                 }
3555         }
3556
3557         if (retval)
3558                 goto err;
3559
3560         con_driver->dev = device_create(vtconsole_class, NULL,
3561                                                 MKDEV(0, con_driver->node),
3562                                                 NULL, "vtcon%i",
3563                                                 con_driver->node);
3564
3565         if (IS_ERR(con_driver->dev)) {
3566                 printk(KERN_WARNING "Unable to create device for %s; "
3567                        "errno = %ld\n", con_driver->desc,
3568                        PTR_ERR(con_driver->dev));
3569                 con_driver->dev = NULL;
3570         } else {
3571                 vtconsole_init_device(con_driver);
3572         }
3573
3574 err:
3575         module_put(owner);
3576         return retval;
3577 }
3578
3579 /**
3580  * register_con_driver - register console driver to console layer
3581  * @csw: console driver
3582  * @first: the first console to take over, minimum value is 0
3583  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3584  *
3585  * DESCRIPTION: This function registers a console driver which can later
3586  * bind to a range of consoles specified by @first and @last. It will
3587  * also initialize the console driver by calling con_startup().
3588  */
3589 int register_con_driver(const struct consw *csw, int first, int last)
3590 {
3591         int retval;
3592
3593         console_lock();
3594         retval = do_register_con_driver(csw, first, last);
3595         console_unlock();
3596         return retval;
3597 }
3598 EXPORT_SYMBOL(register_con_driver);
3599
3600 /**
3601  * unregister_con_driver - unregister console driver from console layer
3602  * @csw: console driver
3603  *
3604  * DESCRIPTION: All drivers that registers to the console layer must
3605  * call this function upon exit, or if the console driver is in a state
3606  * where it won't be able to handle console services, such as the
3607  * framebuffer console without loaded framebuffer drivers.
3608  *
3609  * The driver must unbind first prior to unregistration.
3610  */
3611 int unregister_con_driver(const struct consw *csw)
3612 {
3613         int retval;
3614
3615         console_lock();
3616         retval = do_unregister_con_driver(csw);
3617         console_unlock();
3618         return retval;
3619 }
3620 EXPORT_SYMBOL(unregister_con_driver);
3621
3622 int do_unregister_con_driver(const struct consw *csw)
3623 {
3624         int i, retval = -ENODEV;
3625
3626         /* cannot unregister a bound driver */
3627         if (con_is_bound(csw))
3628                 goto err;
3629
3630         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3631                 struct con_driver *con_driver = &registered_con_driver[i];
3632
3633                 if (con_driver->con == csw &&
3634                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3635                         vtconsole_deinit_device(con_driver);
3636                         device_destroy(vtconsole_class,
3637                                        MKDEV(0, con_driver->node));
3638                         con_driver->con = NULL;
3639                         con_driver->desc = NULL;
3640                         con_driver->dev = NULL;
3641                         con_driver->node = 0;
3642                         con_driver->flag = 0;
3643                         con_driver->first = 0;
3644                         con_driver->last = 0;
3645                         retval = 0;
3646                         break;
3647                 }
3648         }
3649 err:
3650         return retval;
3651 }
3652 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3653
3654 /*
3655  *      If we support more console drivers, this function is used
3656  *      when a driver wants to take over some existing consoles
3657  *      and become default driver for newly opened ones.
3658  *
3659  *      take_over_console is basically a register followed by unbind
3660  */
3661 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3662 {
3663         int err;
3664
3665         err = do_register_con_driver(csw, first, last);
3666         /*
3667          * If we get an busy error we still want to bind the console driver
3668          * and return success, as we may have unbound the console driver
3669          * but not unregistered it.
3670          */
3671         if (err == -EBUSY)
3672                 err = 0;
3673         if (!err)
3674                 do_bind_con_driver(csw, first, last, deflt);
3675
3676         return err;
3677 }
3678 EXPORT_SYMBOL_GPL(do_take_over_console);
3679
3680 /*
3681  *      If we support more console drivers, this function is used
3682  *      when a driver wants to take over some existing consoles
3683  *      and become default driver for newly opened ones.
3684  *
3685  *      take_over_console is basically a register followed by unbind
3686  */
3687 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3688 {
3689         int err;
3690
3691         err = register_con_driver(csw, first, last);
3692         /*
3693          * If we get an busy error we still want to bind the console driver
3694          * and return success, as we may have unbound the console driver
3695          * but not unregistered it.
3696          */
3697         if (err == -EBUSY)
3698                 err = 0;
3699         if (!err)
3700                 bind_con_driver(csw, first, last, deflt);
3701
3702         return err;
3703 }
3704
3705 /*
3706  * give_up_console is a wrapper to unregister_con_driver. It will only
3707  * work if driver is fully unbound.
3708  */
3709 void give_up_console(const struct consw *csw)
3710 {
3711         unregister_con_driver(csw);
3712 }
3713
3714 static int __init vtconsole_class_init(void)
3715 {
3716         int i;
3717
3718         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3719         if (IS_ERR(vtconsole_class)) {
3720                 printk(KERN_WARNING "Unable to create vt console class; "
3721                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3722                 vtconsole_class = NULL;
3723         }
3724
3725         /* Add system drivers to sysfs */
3726         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3727                 struct con_driver *con = &registered_con_driver[i];
3728
3729                 if (con->con && !con->dev) {
3730                         con->dev = device_create(vtconsole_class, NULL,
3731                                                          MKDEV(0, con->node),
3732                                                          NULL, "vtcon%i",
3733                                                          con->node);
3734
3735                         if (IS_ERR(con->dev)) {
3736                                 printk(KERN_WARNING "Unable to create "
3737                                        "device for %s; errno = %ld\n",
3738                                        con->desc, PTR_ERR(con->dev));
3739                                 con->dev = NULL;
3740                         } else {
3741                                 vtconsole_init_device(con);
3742                         }
3743                 }
3744         }
3745
3746         return 0;
3747 }
3748 postcore_initcall(vtconsole_class_init);
3749
3750 #endif
3751
3752 /*
3753  *      Screen blanking
3754  */
3755
3756 static int set_vesa_blanking(char __user *p)
3757 {
3758         unsigned int mode;
3759
3760         if (get_user(mode, p + 1))
3761                 return -EFAULT;
3762
3763         vesa_blank_mode = (mode < 4) ? mode : 0;
3764         return 0;
3765 }
3766
3767 void do_blank_screen(int entering_gfx)
3768 {
3769         struct vc_data *vc = vc_cons[fg_console].d;
3770         int i;
3771
3772         WARN_CONSOLE_UNLOCKED();
3773
3774         if (console_blanked) {
3775                 if (blank_state == blank_vesa_wait) {
3776                         blank_state = blank_off;
3777                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3778                 }
3779                 return;
3780         }
3781
3782         /* entering graphics mode? */
3783         if (entering_gfx) {
3784                 hide_cursor(vc);
3785                 save_screen(vc);
3786                 vc->vc_sw->con_blank(vc, -1, 1);
3787                 console_blanked = fg_console + 1;
3788                 blank_state = blank_off;
3789                 set_origin(vc);
3790                 return;
3791         }
3792
3793         if (blank_state != blank_normal_wait)
3794                 return;
3795         blank_state = blank_off;
3796
3797         /* don't blank graphics */
3798         if (vc->vc_mode != KD_TEXT) {
3799                 console_blanked = fg_console + 1;
3800                 return;
3801         }
3802
3803         hide_cursor(vc);
3804         del_timer_sync(&console_timer);
3805         blank_timer_expired = 0;
3806
3807         save_screen(vc);
3808         /* In case we need to reset origin, blanking hook returns 1 */
3809         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3810         console_blanked = fg_console + 1;
3811         if (i)
3812                 set_origin(vc);
3813
3814         if (console_blank_hook && console_blank_hook(1))
3815                 return;
3816
3817         if (vesa_off_interval && vesa_blank_mode) {
3818                 blank_state = blank_vesa_wait;
3819                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3820         }
3821         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3822 }
3823 EXPORT_SYMBOL(do_blank_screen);
3824
3825 /*
3826  * Called by timer as well as from vt_console_driver
3827  */
3828 void do_unblank_screen(int leaving_gfx)
3829 {
3830         struct vc_data *vc;
3831
3832         /* This should now always be called from a "sane" (read: can schedule)
3833          * context for the sake of the low level drivers, except in the special
3834          * case of oops_in_progress
3835          */
3836         if (!oops_in_progress)
3837                 might_sleep();
3838
3839         WARN_CONSOLE_UNLOCKED();
3840
3841         ignore_poke = 0;
3842         if (!console_blanked)
3843                 return;
3844         if (!vc_cons_allocated(fg_console)) {
3845                 /* impossible */
3846                 pr_warning("unblank_screen: tty %d not allocated ??\n",
3847                            fg_console+1);
3848                 return;
3849         }
3850         vc = vc_cons[fg_console].d;
3851         /* Try to unblank in oops case too */
3852         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3853                 return; /* but leave console_blanked != 0 */
3854
3855         if (blankinterval) {
3856                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3857                 blank_state = blank_normal_wait;
3858         }
3859
3860         console_blanked = 0;
3861         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3862                 /* Low-level driver cannot restore -> do it ourselves */
3863                 update_screen(vc);
3864         if (console_blank_hook)
3865                 console_blank_hook(0);
3866         set_palette(vc);
3867         set_cursor(vc);
3868         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3869 }
3870 EXPORT_SYMBOL(do_unblank_screen);
3871
3872 /*
3873  * This is called by the outside world to cause a forced unblank, mostly for
3874  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3875  * call it with 1 as an argument and so force a mode restore... that may kill
3876  * X or at least garbage the screen but would also make the Oops visible...
3877  */
3878 void unblank_screen(void)
3879 {
3880         do_unblank_screen(0);
3881 }
3882
3883 /*
3884  * We defer the timer blanking to work queue so it can take the console mutex
3885  * (console operations can still happen at irq time, but only from printk which
3886  * has the console mutex. Not perfect yet, but better than no locking
3887  */
3888 static void blank_screen_t(unsigned long dummy)
3889 {
3890         if (unlikely(!keventd_up())) {
3891                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3892                 return;
3893         }
3894         blank_timer_expired = 1;
3895         schedule_work(&console_work);
3896 }
3897
3898 void poke_blanked_console(void)
3899 {
3900         WARN_CONSOLE_UNLOCKED();
3901
3902         /* Add this so we quickly catch whoever might call us in a non
3903          * safe context. Nowadays, unblank_screen() isn't to be called in
3904          * atomic contexts and is allowed to schedule (with the special case
3905          * of oops_in_progress, but that isn't of any concern for this
3906          * function. --BenH.
3907          */
3908         might_sleep();
3909
3910         /* This isn't perfectly race free, but a race here would be mostly harmless,
3911          * at worse, we'll do a spurrious blank and it's unlikely
3912          */
3913         del_timer(&console_timer);
3914         blank_timer_expired = 0;
3915
3916         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3917                 return;
3918         if (console_blanked)
3919                 unblank_screen();
3920         else if (blankinterval) {
3921                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3922                 blank_state = blank_normal_wait;
3923         }
3924 }
3925
3926 /*
3927  *      Palettes
3928  */
3929
3930 static void set_palette(struct vc_data *vc)
3931 {
3932         WARN_CONSOLE_UNLOCKED();
3933
3934         if (vc->vc_mode != KD_GRAPHICS)
3935                 vc->vc_sw->con_set_palette(vc, color_table);
3936 }
3937
3938 /*
3939  * Load palette into the DAC registers. arg points to a colour
3940  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3941  */
3942
3943 int con_set_cmap(unsigned char __user *arg)
3944 {
3945         int i, j, k;
3946         unsigned char colormap[3*16];
3947
3948         if (copy_from_user(colormap, arg, sizeof(colormap)))
3949                 return -EFAULT;
3950
3951         console_lock();
3952         for (i = k = 0; i < 16; i++) {
3953                 default_red[i] = colormap[k++];
3954                 default_grn[i] = colormap[k++];
3955                 default_blu[i] = colormap[k++];
3956         }
3957         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3958                 if (!vc_cons_allocated(i))
3959                         continue;
3960                 for (j = k = 0; j < 16; j++) {
3961                         vc_cons[i].d->vc_palette[k++] = default_red[j];
3962                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
3963                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
3964                 }
3965                 set_palette(vc_cons[i].d);
3966         }
3967         console_unlock();
3968
3969         return 0;
3970 }
3971
3972 int con_get_cmap(unsigned char __user *arg)
3973 {
3974         int i, k;
3975         unsigned char colormap[3*16];
3976
3977         console_lock();
3978         for (i = k = 0; i < 16; i++) {
3979                 colormap[k++] = default_red[i];
3980                 colormap[k++] = default_grn[i];
3981                 colormap[k++] = default_blu[i];
3982         }
3983         console_unlock();
3984
3985         if (copy_to_user(arg, colormap, sizeof(colormap)))
3986                 return -EFAULT;
3987
3988         return 0;
3989 }
3990
3991 void reset_palette(struct vc_data *vc)
3992 {
3993         int j, k;
3994         for (j=k=0; j<16; j++) {
3995                 vc->vc_palette[k++] = default_red[j];
3996                 vc->vc_palette[k++] = default_grn[j];
3997                 vc->vc_palette[k++] = default_blu[j];
3998         }
3999         set_palette(vc);
4000 }
4001
4002 /*
4003  *  Font switching
4004  *
4005  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4006  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4007  *  depending on width) reserved for each character which is kinda wasty, but
4008  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4009  *  is up to the actual low-level console-driver convert data into its favorite
4010  *  format (maybe we should add a `fontoffset' field to the `display'
4011  *  structure so we won't have to convert the fontdata all the time.
4012  *  /Jes
4013  */
4014
4015 #define max_font_size 65536
4016
4017 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4018 {
4019         struct console_font font;
4020         int rc = -EINVAL;
4021         int c;
4022
4023         if (op->data) {
4024                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4025                 if (!font.data)
4026                         return -ENOMEM;
4027         } else
4028                 font.data = NULL;
4029
4030         console_lock();
4031         if (vc->vc_mode != KD_TEXT)
4032                 rc = -EINVAL;
4033         else if (vc->vc_sw->con_font_get)
4034                 rc = vc->vc_sw->con_font_get(vc, &font);
4035         else
4036                 rc = -ENOSYS;
4037         console_unlock();
4038
4039         if (rc)
4040                 goto out;
4041
4042         c = (font.width+7)/8 * 32 * font.charcount;
4043
4044         if (op->data && font.charcount > op->charcount)
4045                 rc = -ENOSPC;
4046         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4047                 if (font.width > op->width || font.height > op->height)
4048                         rc = -ENOSPC;
4049         } else {
4050                 if (font.width != 8)
4051                         rc = -EIO;
4052                 else if ((op->height && font.height > op->height) ||
4053                          font.height > 32)
4054                         rc = -ENOSPC;
4055         }
4056         if (rc)
4057                 goto out;
4058
4059         op->height = font.height;
4060         op->width = font.width;
4061         op->charcount = font.charcount;
4062
4063         if (op->data && copy_to_user(op->data, font.data, c))
4064                 rc = -EFAULT;
4065
4066 out:
4067         kfree(font.data);
4068         return rc;
4069 }
4070
4071 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4072 {
4073         struct console_font font;
4074         int rc = -EINVAL;
4075         int size;
4076
4077         if (vc->vc_mode != KD_TEXT)
4078                 return -EINVAL;
4079         if (!op->data)
4080                 return -EINVAL;
4081         if (op->charcount > 512)
4082                 return -EINVAL;
4083         if (!op->height) {              /* Need to guess font height [compat] */
4084                 int h, i;
4085                 u8 __user *charmap = op->data;
4086                 u8 tmp;
4087
4088                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4089                    so that we can get rid of this soon */
4090                 if (!(op->flags & KD_FONT_FLAG_OLD))
4091                         return -EINVAL;
4092                 for (h = 32; h > 0; h--)
4093                         for (i = 0; i < op->charcount; i++) {
4094                                 if (get_user(tmp, &charmap[32*i+h-1]))
4095                                         return -EFAULT;
4096                                 if (tmp)
4097                                         goto nonzero;
4098                         }
4099                 return -EINVAL;
4100         nonzero:
4101                 op->height = h;
4102         }
4103         if (op->width <= 0 || op->width > 32 || op->height > 32)
4104                 return -EINVAL;
4105         size = (op->width+7)/8 * 32 * op->charcount;
4106         if (size > max_font_size)
4107                 return -ENOSPC;
4108         font.charcount = op->charcount;
4109         font.height = op->height;
4110         font.width = op->width;
4111         font.data = memdup_user(op->data, size);
4112         if (IS_ERR(font.data))
4113                 return PTR_ERR(font.data);
4114         console_lock();
4115         if (vc->vc_mode != KD_TEXT)
4116                 rc = -EINVAL;
4117         else if (vc->vc_sw->con_font_set)
4118                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4119         else
4120                 rc = -ENOSYS;
4121         console_unlock();
4122         kfree(font.data);
4123         return rc;
4124 }
4125
4126 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4127 {
4128         struct console_font font = {.width = op->width, .height = op->height};
4129         char name[MAX_FONT_NAME];
4130         char *s = name;
4131         int rc;
4132
4133
4134         if (!op->data)
4135                 s = NULL;
4136         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4137                 return -EFAULT;
4138         else
4139                 name[MAX_FONT_NAME - 1] = 0;
4140
4141         console_lock();
4142         if (vc->vc_mode != KD_TEXT) {
4143                 console_unlock();
4144                 return -EINVAL;
4145         }
4146         if (vc->vc_sw->con_font_default)
4147                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4148         else
4149                 rc = -ENOSYS;
4150         console_unlock();
4151         if (!rc) {
4152                 op->width = font.width;
4153                 op->height = font.height;
4154         }
4155         return rc;
4156 }
4157
4158 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4159 {
4160         int con = op->height;
4161         int rc;
4162
4163
4164         console_lock();
4165         if (vc->vc_mode != KD_TEXT)
4166                 rc = -EINVAL;
4167         else if (!vc->vc_sw->con_font_copy)
4168                 rc = -ENOSYS;
4169         else if (con < 0 || !vc_cons_allocated(con))
4170                 rc = -ENOTTY;
4171         else if (con == vc->vc_num)     /* nothing to do */
4172                 rc = 0;
4173         else
4174                 rc = vc->vc_sw->con_font_copy(vc, con);
4175         console_unlock();
4176         return rc;
4177 }
4178
4179 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4180 {
4181         switch (op->op) {
4182         case KD_FONT_OP_SET:
4183                 return con_font_set(vc, op);
4184         case KD_FONT_OP_GET:
4185                 return con_font_get(vc, op);
4186         case KD_FONT_OP_SET_DEFAULT:
4187                 return con_font_default(vc, op);
4188         case KD_FONT_OP_COPY:
4189                 return con_font_copy(vc, op);
4190         }
4191         return -ENOSYS;
4192 }
4193
4194 /*
4195  *      Interface exported to selection and vcs.
4196  */
4197
4198 /* used by selection */
4199 u16 screen_glyph(struct vc_data *vc, int offset)
4200 {
4201         u16 w = scr_readw(screenpos(vc, offset, 1));
4202         u16 c = w & 0xff;
4203
4204         if (w & vc->vc_hi_font_mask)
4205                 c |= 0x100;
4206         return c;
4207 }
4208 EXPORT_SYMBOL_GPL(screen_glyph);
4209
4210 /* used by vcs - note the word offset */
4211 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4212 {
4213         return screenpos(vc, 2 * w_offset, viewed);
4214 }
4215
4216 void getconsxy(struct vc_data *vc, unsigned char *p)
4217 {
4218         p[0] = vc->vc_x;
4219         p[1] = vc->vc_y;
4220 }
4221
4222 void putconsxy(struct vc_data *vc, unsigned char *p)
4223 {
4224         hide_cursor(vc);
4225         gotoxy(vc, p[0], p[1]);
4226         set_cursor(vc);
4227 }
4228
4229 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4230 {
4231         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4232                 return softcursor_original;
4233         return scr_readw(org);
4234 }
4235
4236 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4237 {
4238         scr_writew(val, org);
4239         if ((unsigned long)org == vc->vc_pos) {
4240                 softcursor_original = -1;
4241                 add_softcursor(vc);
4242         }
4243 }
4244
4245 void vcs_scr_updated(struct vc_data *vc)
4246 {
4247         notify_update(vc);
4248 }
4249
4250 /*
4251  *      Visible symbols for modules
4252  */
4253
4254 EXPORT_SYMBOL(color_table);
4255 EXPORT_SYMBOL(default_red);
4256 EXPORT_SYMBOL(default_grn);
4257 EXPORT_SYMBOL(default_blu);
4258 EXPORT_SYMBOL(update_region);
4259 EXPORT_SYMBOL(redraw_screen);
4260 EXPORT_SYMBOL(vc_resize);
4261 EXPORT_SYMBOL(fg_console);
4262 EXPORT_SYMBOL(console_blank_hook);
4263 EXPORT_SYMBOL(console_blanked);
4264 EXPORT_SYMBOL(vc_cons);
4265 EXPORT_SYMBOL(global_cursor_default);
4266 #ifndef VT_SINGLE_DRIVER
4267 EXPORT_SYMBOL(take_over_console);
4268 EXPORT_SYMBOL(give_up_console);
4269 #endif