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