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                         if (CON_IS_VISIBLE(vc))
1168                                 update_screen(vc);
1169                         /* fall through */
1170                 case 2: /* erase whole display */
1171                         count = vc->vc_cols * vc->vc_rows;
1172                         start = (unsigned short *)vc->vc_origin;
1173                         break;
1174                 default:
1175                         return;
1176         }
1177         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1178         if (DO_UPDATE(vc))
1179                 do_update_region(vc, (unsigned long) start, count);
1180         vc->vc_need_wrap = 0;
1181 }
1182
1183 static void csi_K(struct vc_data *vc, int vpar)
1184 {
1185         unsigned int count;
1186         unsigned short * start;
1187
1188         switch (vpar) {
1189                 case 0: /* erase from cursor to end of line */
1190                         count = vc->vc_cols - vc->vc_x;
1191                         start = (unsigned short *)vc->vc_pos;
1192                         break;
1193                 case 1: /* erase from start of line to cursor */
1194                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1195                         count = vc->vc_x + 1;
1196                         break;
1197                 case 2: /* erase whole line */
1198                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1199                         count = vc->vc_cols;
1200                         break;
1201                 default:
1202                         return;
1203         }
1204         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1205         vc->vc_need_wrap = 0;
1206         if (DO_UPDATE(vc))
1207                 do_update_region(vc, (unsigned long) start, count);
1208 }
1209
1210 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1211 {                                         /* not vt100? */
1212         int count;
1213
1214         if (!vpar)
1215                 vpar++;
1216         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1217
1218         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1219         if (DO_UPDATE(vc))
1220                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1221         vc->vc_need_wrap = 0;
1222 }
1223
1224 static void default_attr(struct vc_data *vc)
1225 {
1226         vc->vc_intensity = 1;
1227         vc->vc_italic = 0;
1228         vc->vc_underline = 0;
1229         vc->vc_reverse = 0;
1230         vc->vc_blink = 0;
1231         vc->vc_color = vc->vc_def_color;
1232 }
1233
1234 /* console_lock is held */
1235 static void csi_m(struct vc_data *vc)
1236 {
1237         int i;
1238
1239         for (i = 0; i <= vc->vc_npar; i++)
1240                 switch (vc->vc_par[i]) {
1241                         case 0: /* all attributes off */
1242                                 default_attr(vc);
1243                                 break;
1244                         case 1:
1245                                 vc->vc_intensity = 2;
1246                                 break;
1247                         case 2:
1248                                 vc->vc_intensity = 0;
1249                                 break;
1250                         case 3:
1251                                 vc->vc_italic = 1;
1252                                 break;
1253                         case 4:
1254                                 vc->vc_underline = 1;
1255                                 break;
1256                         case 5:
1257                                 vc->vc_blink = 1;
1258                                 break;
1259                         case 7:
1260                                 vc->vc_reverse = 1;
1261                                 break;
1262                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1263                                   * Select primary font, don't display
1264                                   * control chars if defined, don't set
1265                                   * bit 8 on output.
1266                                   */
1267                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1268                                                 ? vc->vc_G0_charset
1269                                                 : vc->vc_G1_charset, vc);
1270                                 vc->vc_disp_ctrl = 0;
1271                                 vc->vc_toggle_meta = 0;
1272                                 break;
1273                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1274                                   * Select first alternate font, lets
1275                                   * chars < 32 be displayed as ROM chars.
1276                                   */
1277                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1278                                 vc->vc_disp_ctrl = 1;
1279                                 vc->vc_toggle_meta = 0;
1280                                 break;
1281                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1282                                   * Select second alternate font, toggle
1283                                   * high bit before displaying as ROM char.
1284                                   */
1285                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1286                                 vc->vc_disp_ctrl = 1;
1287                                 vc->vc_toggle_meta = 1;
1288                                 break;
1289                         case 21:
1290                         case 22:
1291                                 vc->vc_intensity = 1;
1292                                 break;
1293                         case 23:
1294                                 vc->vc_italic = 0;
1295                                 break;
1296                         case 24:
1297                                 vc->vc_underline = 0;
1298                                 break;
1299                         case 25:
1300                                 vc->vc_blink = 0;
1301                                 break;
1302                         case 27:
1303                                 vc->vc_reverse = 0;
1304                                 break;
1305                         case 38:
1306                         case 48: /* ITU T.416
1307                                   * Higher colour modes.
1308                                   * They break the usual properties of SGR codes
1309                                   * and thus need to be detected and ignored by
1310                                   * hand.  Strictly speaking, that standard also
1311                                   * wants : rather than ; as separators, contrary
1312                                   * to ECMA-48, but no one produces such codes
1313                                   * and almost no one accepts them.
1314                                   */
1315                                 i++;
1316                                 if (i > vc->vc_npar)
1317                                         break;
1318                                 if (vc->vc_par[i] == 5)      /* 256 colours */
1319                                         i++;                 /* ubiquitous */
1320                                 else if (vc->vc_par[i] == 2) /* 24 bit colours */
1321                                         i += 3;              /* extremely rare */
1322                                 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1323                                  * that detecting them is not worth the few extra
1324                                  * bytes of kernel's size.
1325                                  */
1326                                 break;
1327                         case 39:
1328                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1329                                 break;
1330                         case 49:
1331                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1332                                 break;
1333                         default:
1334                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1335                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1336                                                 | (vc->vc_color & 0xf0);
1337                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1338                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1339                                                 | (vc->vc_color & 0x0f);
1340                                 break;
1341                 }
1342         update_attr(vc);
1343 }
1344
1345 static void respond_string(const char *p, struct tty_port *port)
1346 {
1347         while (*p) {
1348                 tty_insert_flip_char(port, *p, 0);
1349                 p++;
1350         }
1351         tty_schedule_flip(port);
1352 }
1353
1354 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1355 {
1356         char buf[40];
1357
1358         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1359         respond_string(buf, tty->port);
1360 }
1361
1362 static inline void status_report(struct tty_struct *tty)
1363 {
1364         respond_string("\033[0n", tty->port);   /* Terminal ok */
1365 }
1366
1367 static inline void respond_ID(struct tty_struct *tty)
1368 {
1369         respond_string(VT102ID, tty->port);
1370 }
1371
1372 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1373 {
1374         char buf[8];
1375
1376         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1377                 (char)('!' + mry));
1378         respond_string(buf, tty->port);
1379 }
1380
1381 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1382 int mouse_reporting(void)
1383 {
1384         return vc_cons[fg_console].d->vc_report_mouse;
1385 }
1386
1387 /* console_lock is held */
1388 static void set_mode(struct vc_data *vc, int on_off)
1389 {
1390         int i;
1391
1392         for (i = 0; i <= vc->vc_npar; i++)
1393                 if (vc->vc_ques) {
1394                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1395                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1396                                 if (on_off)
1397                                         set_kbd(vc, decckm);
1398                                 else
1399                                         clr_kbd(vc, decckm);
1400                                 break;
1401                         case 3: /* 80/132 mode switch unimplemented */
1402                                 vc->vc_deccolm = on_off;
1403 #if 0
1404                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1405                                 /* this alone does not suffice; some user mode
1406                                    utility has to change the hardware regs */
1407 #endif
1408                                 break;
1409                         case 5:                 /* Inverted screen on/off */
1410                                 if (vc->vc_decscnm != on_off) {
1411                                         vc->vc_decscnm = on_off;
1412                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1413                                         update_attr(vc);
1414                                 }
1415                                 break;
1416                         case 6:                 /* Origin relative/absolute */
1417                                 vc->vc_decom = on_off;
1418                                 gotoxay(vc, 0, 0);
1419                                 break;
1420                         case 7:                 /* Autowrap on/off */
1421                                 vc->vc_decawm = on_off;
1422                                 break;
1423                         case 8:                 /* Autorepeat on/off */
1424                                 if (on_off)
1425                                         set_kbd(vc, decarm);
1426                                 else
1427                                         clr_kbd(vc, decarm);
1428                                 break;
1429                         case 9:
1430                                 vc->vc_report_mouse = on_off ? 1 : 0;
1431                                 break;
1432                         case 25:                /* Cursor on/off */
1433                                 vc->vc_deccm = on_off;
1434                                 break;
1435                         case 1000:
1436                                 vc->vc_report_mouse = on_off ? 2 : 0;
1437                                 break;
1438                         }
1439                 } else {
1440                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1441                         case 3:                 /* Monitor (display ctrls) */
1442                                 vc->vc_disp_ctrl = on_off;
1443                                 break;
1444                         case 4:                 /* Insert Mode on/off */
1445                                 vc->vc_decim = on_off;
1446                                 break;
1447                         case 20:                /* Lf, Enter == CrLf/Lf */
1448                                 if (on_off)
1449                                         set_kbd(vc, lnm);
1450                                 else
1451                                         clr_kbd(vc, lnm);
1452                                 break;
1453                         }
1454                 }
1455 }
1456
1457 /* console_lock is held */
1458 static void setterm_command(struct vc_data *vc)
1459 {
1460         switch(vc->vc_par[0]) {
1461                 case 1: /* set color for underline mode */
1462                         if (vc->vc_can_do_color &&
1463                                         vc->vc_par[1] < 16) {
1464                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1465                                 if (vc->vc_underline)
1466                                         update_attr(vc);
1467                         }
1468                         break;
1469                 case 2: /* set color for half intensity mode */
1470                         if (vc->vc_can_do_color &&
1471                                         vc->vc_par[1] < 16) {
1472                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1473                                 if (vc->vc_intensity == 0)
1474                                         update_attr(vc);
1475                         }
1476                         break;
1477                 case 8: /* store colors as defaults */
1478                         vc->vc_def_color = vc->vc_attr;
1479                         if (vc->vc_hi_font_mask == 0x100)
1480                                 vc->vc_def_color >>= 1;
1481                         default_attr(vc);
1482                         update_attr(vc);
1483                         break;
1484                 case 9: /* set blanking interval */
1485                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1486                         poke_blanked_console();
1487                         break;
1488                 case 10: /* set bell frequency in Hz */
1489                         if (vc->vc_npar >= 1)
1490                                 vc->vc_bell_pitch = vc->vc_par[1];
1491                         else
1492                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1493                         break;
1494                 case 11: /* set bell duration in msec */
1495                         if (vc->vc_npar >= 1)
1496                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1497                                         vc->vc_par[1] * HZ / 1000 : 0;
1498                         else
1499                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1500                         break;
1501                 case 12: /* bring specified console to the front */
1502                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1503                                 set_console(vc->vc_par[1] - 1);
1504                         break;
1505                 case 13: /* unblank the screen */
1506                         poke_blanked_console();
1507                         break;
1508                 case 14: /* set vesa powerdown interval */
1509                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1510                         break;
1511                 case 15: /* activate the previous console */
1512                         set_console(last_console);
1513                         break;
1514         }
1515 }
1516
1517 /* console_lock is held */
1518 static void csi_at(struct vc_data *vc, unsigned int nr)
1519 {
1520         if (nr > vc->vc_cols - vc->vc_x)
1521                 nr = vc->vc_cols - vc->vc_x;
1522         else if (!nr)
1523                 nr = 1;
1524         insert_char(vc, nr);
1525 }
1526
1527 /* console_lock is held */
1528 static void csi_L(struct vc_data *vc, unsigned int nr)
1529 {
1530         if (nr > vc->vc_rows - vc->vc_y)
1531                 nr = vc->vc_rows - vc->vc_y;
1532         else if (!nr)
1533                 nr = 1;
1534         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1535         vc->vc_need_wrap = 0;
1536 }
1537
1538 /* console_lock is held */
1539 static void csi_P(struct vc_data *vc, unsigned int nr)
1540 {
1541         if (nr > vc->vc_cols - vc->vc_x)
1542                 nr = vc->vc_cols - vc->vc_x;
1543         else if (!nr)
1544                 nr = 1;
1545         delete_char(vc, nr);
1546 }
1547
1548 /* console_lock is held */
1549 static void csi_M(struct vc_data *vc, unsigned int nr)
1550 {
1551         if (nr > vc->vc_rows - vc->vc_y)
1552                 nr = vc->vc_rows - vc->vc_y;
1553         else if (!nr)
1554                 nr=1;
1555         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1556         vc->vc_need_wrap = 0;
1557 }
1558
1559 /* console_lock is held (except via vc_init->reset_terminal */
1560 static void save_cur(struct vc_data *vc)
1561 {
1562         vc->vc_saved_x          = vc->vc_x;
1563         vc->vc_saved_y          = vc->vc_y;
1564         vc->vc_s_intensity      = vc->vc_intensity;
1565         vc->vc_s_italic         = vc->vc_italic;
1566         vc->vc_s_underline      = vc->vc_underline;
1567         vc->vc_s_blink          = vc->vc_blink;
1568         vc->vc_s_reverse        = vc->vc_reverse;
1569         vc->vc_s_charset        = vc->vc_charset;
1570         vc->vc_s_color          = vc->vc_color;
1571         vc->vc_saved_G0         = vc->vc_G0_charset;
1572         vc->vc_saved_G1         = vc->vc_G1_charset;
1573 }
1574
1575 /* console_lock is held */
1576 static void restore_cur(struct vc_data *vc)
1577 {
1578         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1579         vc->vc_intensity        = vc->vc_s_intensity;
1580         vc->vc_italic           = vc->vc_s_italic;
1581         vc->vc_underline        = vc->vc_s_underline;
1582         vc->vc_blink            = vc->vc_s_blink;
1583         vc->vc_reverse          = vc->vc_s_reverse;
1584         vc->vc_charset          = vc->vc_s_charset;
1585         vc->vc_color            = vc->vc_s_color;
1586         vc->vc_G0_charset       = vc->vc_saved_G0;
1587         vc->vc_G1_charset       = vc->vc_saved_G1;
1588         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1589         update_attr(vc);
1590         vc->vc_need_wrap = 0;
1591 }
1592
1593 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1594         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1595         ESpalette };
1596
1597 /* console_lock is held (except via vc_init()) */
1598 static void reset_terminal(struct vc_data *vc, int do_clear)
1599 {
1600         vc->vc_top              = 0;
1601         vc->vc_bottom           = vc->vc_rows;
1602         vc->vc_state            = ESnormal;
1603         vc->vc_ques             = 0;
1604         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1605         vc->vc_G0_charset       = LAT1_MAP;
1606         vc->vc_G1_charset       = GRAF_MAP;
1607         vc->vc_charset          = 0;
1608         vc->vc_need_wrap        = 0;
1609         vc->vc_report_mouse     = 0;
1610         vc->vc_utf              = default_utf8;
1611         vc->vc_utf_count        = 0;
1612
1613         vc->vc_disp_ctrl        = 0;
1614         vc->vc_toggle_meta      = 0;
1615
1616         vc->vc_decscnm          = 0;
1617         vc->vc_decom            = 0;
1618         vc->vc_decawm           = 1;
1619         vc->vc_deccm            = global_cursor_default;
1620         vc->vc_decim            = 0;
1621
1622         vt_reset_keyboard(vc->vc_num);
1623
1624         vc->vc_cursor_type = cur_default;
1625         vc->vc_complement_mask = vc->vc_s_complement_mask;
1626
1627         default_attr(vc);
1628         update_attr(vc);
1629
1630         vc->vc_tab_stop[0]      = 0x01010100;
1631         vc->vc_tab_stop[1]      =
1632         vc->vc_tab_stop[2]      =
1633         vc->vc_tab_stop[3]      =
1634         vc->vc_tab_stop[4]      =
1635         vc->vc_tab_stop[5]      =
1636         vc->vc_tab_stop[6]      =
1637         vc->vc_tab_stop[7]      = 0x01010101;
1638
1639         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1640         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1641
1642         gotoxy(vc, 0, 0);
1643         save_cur(vc);
1644         if (do_clear)
1645             csi_J(vc, 2);
1646 }
1647
1648 /* console_lock is held */
1649 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1650 {
1651         /*
1652          *  Control characters can be used in the _middle_
1653          *  of an escape sequence.
1654          */
1655         switch (c) {
1656         case 0:
1657                 return;
1658         case 7:
1659                 if (vc->vc_bell_duration)
1660                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1661                 return;
1662         case 8:
1663                 bs(vc);
1664                 return;
1665         case 9:
1666                 vc->vc_pos -= (vc->vc_x << 1);
1667                 while (vc->vc_x < vc->vc_cols - 1) {
1668                         vc->vc_x++;
1669                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1670                                 break;
1671                 }
1672                 vc->vc_pos += (vc->vc_x << 1);
1673                 notify_write(vc, '\t');
1674                 return;
1675         case 10: case 11: case 12:
1676                 lf(vc);
1677                 if (!is_kbd(vc, lnm))
1678                         return;
1679         case 13:
1680                 cr(vc);
1681                 return;
1682         case 14:
1683                 vc->vc_charset = 1;
1684                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1685                 vc->vc_disp_ctrl = 1;
1686                 return;
1687         case 15:
1688                 vc->vc_charset = 0;
1689                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1690                 vc->vc_disp_ctrl = 0;
1691                 return;
1692         case 24: case 26:
1693                 vc->vc_state = ESnormal;
1694                 return;
1695         case 27:
1696                 vc->vc_state = ESesc;
1697                 return;
1698         case 127:
1699                 del(vc);
1700                 return;
1701         case 128+27:
1702                 vc->vc_state = ESsquare;
1703                 return;
1704         }
1705         switch(vc->vc_state) {
1706         case ESesc:
1707                 vc->vc_state = ESnormal;
1708                 switch (c) {
1709                 case '[':
1710                         vc->vc_state = ESsquare;
1711                         return;
1712                 case ']':
1713                         vc->vc_state = ESnonstd;
1714                         return;
1715                 case '%':
1716                         vc->vc_state = ESpercent;
1717                         return;
1718                 case 'E':
1719                         cr(vc);
1720                         lf(vc);
1721                         return;
1722                 case 'M':
1723                         ri(vc);
1724                         return;
1725                 case 'D':
1726                         lf(vc);
1727                         return;
1728                 case 'H':
1729                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1730                         return;
1731                 case 'Z':
1732                         respond_ID(tty);
1733                         return;
1734                 case '7':
1735                         save_cur(vc);
1736                         return;
1737                 case '8':
1738                         restore_cur(vc);
1739                         return;
1740                 case '(':
1741                         vc->vc_state = ESsetG0;
1742                         return;
1743                 case ')':
1744                         vc->vc_state = ESsetG1;
1745                         return;
1746                 case '#':
1747                         vc->vc_state = EShash;
1748                         return;
1749                 case 'c':
1750                         reset_terminal(vc, 1);
1751                         return;
1752                 case '>':  /* Numeric keypad */
1753                         clr_kbd(vc, kbdapplic);
1754                         return;
1755                 case '=':  /* Appl. keypad */
1756                         set_kbd(vc, kbdapplic);
1757                         return;
1758                 }
1759                 return;
1760         case ESnonstd:
1761                 if (c=='P') {   /* palette escape sequence */
1762                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1763                                 vc->vc_par[vc->vc_npar] = 0;
1764                         vc->vc_npar = 0;
1765                         vc->vc_state = ESpalette;
1766                         return;
1767                 } else if (c=='R') {   /* reset palette */
1768                         reset_palette(vc);
1769                         vc->vc_state = ESnormal;
1770                 } else
1771                         vc->vc_state = ESnormal;
1772                 return;
1773         case ESpalette:
1774                 if (isxdigit(c)) {
1775                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1776                         if (vc->vc_npar == 7) {
1777                                 int i = vc->vc_par[0] * 3, j = 1;
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                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1783                                 vc->vc_palette[i] += vc->vc_par[j];
1784                                 set_palette(vc);
1785                                 vc->vc_state = ESnormal;
1786                         }
1787                 } else
1788                         vc->vc_state = ESnormal;
1789                 return;
1790         case ESsquare:
1791                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1792                         vc->vc_par[vc->vc_npar] = 0;
1793                 vc->vc_npar = 0;
1794                 vc->vc_state = ESgetpars;
1795                 if (c == '[') { /* Function key */
1796                         vc->vc_state=ESfunckey;
1797                         return;
1798                 }
1799                 vc->vc_ques = (c == '?');
1800                 if (vc->vc_ques)
1801                         return;
1802         case ESgetpars:
1803                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1804                         vc->vc_npar++;
1805                         return;
1806                 } else if (c>='0' && c<='9') {
1807                         vc->vc_par[vc->vc_npar] *= 10;
1808                         vc->vc_par[vc->vc_npar] += c - '0';
1809                         return;
1810                 } else
1811                         vc->vc_state = ESgotpars;
1812         case ESgotpars:
1813                 vc->vc_state = ESnormal;
1814                 switch(c) {
1815                 case 'h':
1816                         set_mode(vc, 1);
1817                         return;
1818                 case 'l':
1819                         set_mode(vc, 0);
1820                         return;
1821                 case 'c':
1822                         if (vc->vc_ques) {
1823                                 if (vc->vc_par[0])
1824                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1825                                 else
1826                                         vc->vc_cursor_type = cur_default;
1827                                 return;
1828                         }
1829                         break;
1830                 case 'm':
1831                         if (vc->vc_ques) {
1832                                 clear_selection();
1833                                 if (vc->vc_par[0])
1834                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1835                                 else
1836                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1837                                 return;
1838                         }
1839                         break;
1840                 case 'n':
1841                         if (!vc->vc_ques) {
1842                                 if (vc->vc_par[0] == 5)
1843                                         status_report(tty);
1844                                 else if (vc->vc_par[0] == 6)
1845                                         cursor_report(vc, tty);
1846                         }
1847                         return;
1848                 }
1849                 if (vc->vc_ques) {
1850                         vc->vc_ques = 0;
1851                         return;
1852                 }
1853                 switch(c) {
1854                 case 'G': case '`':
1855                         if (vc->vc_par[0])
1856                                 vc->vc_par[0]--;
1857                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1858                         return;
1859                 case 'A':
1860                         if (!vc->vc_par[0])
1861                                 vc->vc_par[0]++;
1862                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1863                         return;
1864                 case 'B': case 'e':
1865                         if (!vc->vc_par[0])
1866                                 vc->vc_par[0]++;
1867                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1868                         return;
1869                 case 'C': case 'a':
1870                         if (!vc->vc_par[0])
1871                                 vc->vc_par[0]++;
1872                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1873                         return;
1874                 case 'D':
1875                         if (!vc->vc_par[0])
1876                                 vc->vc_par[0]++;
1877                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1878                         return;
1879                 case 'E':
1880                         if (!vc->vc_par[0])
1881                                 vc->vc_par[0]++;
1882                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1883                         return;
1884                 case 'F':
1885                         if (!vc->vc_par[0])
1886                                 vc->vc_par[0]++;
1887                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1888                         return;
1889                 case 'd':
1890                         if (vc->vc_par[0])
1891                                 vc->vc_par[0]--;
1892                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1893                         return;
1894                 case 'H': case 'f':
1895                         if (vc->vc_par[0])
1896                                 vc->vc_par[0]--;
1897                         if (vc->vc_par[1])
1898                                 vc->vc_par[1]--;
1899                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1900                         return;
1901                 case 'J':
1902                         csi_J(vc, vc->vc_par[0]);
1903                         return;
1904                 case 'K':
1905                         csi_K(vc, vc->vc_par[0]);
1906                         return;
1907                 case 'L':
1908                         csi_L(vc, vc->vc_par[0]);
1909                         return;
1910                 case 'M':
1911                         csi_M(vc, vc->vc_par[0]);
1912                         return;
1913                 case 'P':
1914                         csi_P(vc, vc->vc_par[0]);
1915                         return;
1916                 case 'c':
1917                         if (!vc->vc_par[0])
1918                                 respond_ID(tty);
1919                         return;
1920                 case 'g':
1921                         if (!vc->vc_par[0])
1922                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1923                         else if (vc->vc_par[0] == 3) {
1924                                 vc->vc_tab_stop[0] =
1925                                         vc->vc_tab_stop[1] =
1926                                         vc->vc_tab_stop[2] =
1927                                         vc->vc_tab_stop[3] =
1928                                         vc->vc_tab_stop[4] =
1929                                         vc->vc_tab_stop[5] =
1930                                         vc->vc_tab_stop[6] =
1931                                         vc->vc_tab_stop[7] = 0;
1932                         }
1933                         return;
1934                 case 'm':
1935                         csi_m(vc);
1936                         return;
1937                 case 'q': /* DECLL - but only 3 leds */
1938                         /* map 0,1,2,3 to 0,1,2,4 */
1939                         if (vc->vc_par[0] < 4)
1940                                 vt_set_led_state(vc->vc_num,
1941                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1942                         return;
1943                 case 'r':
1944                         if (!vc->vc_par[0])
1945                                 vc->vc_par[0]++;
1946                         if (!vc->vc_par[1])
1947                                 vc->vc_par[1] = vc->vc_rows;
1948                         /* Minimum allowed region is 2 lines */
1949                         if (vc->vc_par[0] < vc->vc_par[1] &&
1950                             vc->vc_par[1] <= vc->vc_rows) {
1951                                 vc->vc_top = vc->vc_par[0] - 1;
1952                                 vc->vc_bottom = vc->vc_par[1];
1953                                 gotoxay(vc, 0, 0);
1954                         }
1955                         return;
1956                 case 's':
1957                         save_cur(vc);
1958                         return;
1959                 case 'u':
1960                         restore_cur(vc);
1961                         return;
1962                 case 'X':
1963                         csi_X(vc, vc->vc_par[0]);
1964                         return;
1965                 case '@':
1966                         csi_at(vc, vc->vc_par[0]);
1967                         return;
1968                 case ']': /* setterm functions */
1969                         setterm_command(vc);
1970                         return;
1971                 }
1972                 return;
1973         case ESpercent:
1974                 vc->vc_state = ESnormal;
1975                 switch (c) {
1976                 case '@':  /* defined in ISO 2022 */
1977                         vc->vc_utf = 0;
1978                         return;
1979                 case 'G':  /* prelim official escape code */
1980                 case '8':  /* retained for compatibility */
1981                         vc->vc_utf = 1;
1982                         return;
1983                 }
1984                 return;
1985         case ESfunckey:
1986                 vc->vc_state = ESnormal;
1987                 return;
1988         case EShash:
1989                 vc->vc_state = ESnormal;
1990                 if (c == '8') {
1991                         /* DEC screen alignment test. kludge :-) */
1992                         vc->vc_video_erase_char =
1993                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1994                         csi_J(vc, 2);
1995                         vc->vc_video_erase_char =
1996                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1997                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1998                 }
1999                 return;
2000         case ESsetG0:
2001                 if (c == '0')
2002                         vc->vc_G0_charset = GRAF_MAP;
2003                 else if (c == 'B')
2004                         vc->vc_G0_charset = LAT1_MAP;
2005                 else if (c == 'U')
2006                         vc->vc_G0_charset = IBMPC_MAP;
2007                 else if (c == 'K')
2008                         vc->vc_G0_charset = USER_MAP;
2009                 if (vc->vc_charset == 0)
2010                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2011                 vc->vc_state = ESnormal;
2012                 return;
2013         case ESsetG1:
2014                 if (c == '0')
2015                         vc->vc_G1_charset = GRAF_MAP;
2016                 else if (c == 'B')
2017                         vc->vc_G1_charset = LAT1_MAP;
2018                 else if (c == 'U')
2019                         vc->vc_G1_charset = IBMPC_MAP;
2020                 else if (c == 'K')
2021                         vc->vc_G1_charset = USER_MAP;
2022                 if (vc->vc_charset == 1)
2023                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2024                 vc->vc_state = ESnormal;
2025                 return;
2026         default:
2027                 vc->vc_state = ESnormal;
2028         }
2029 }
2030
2031 /* is_double_width() is based on the wcwidth() implementation by
2032  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2033  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2034  */
2035 struct interval {
2036         uint32_t first;
2037         uint32_t last;
2038 };
2039
2040 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2041 {
2042         int min = 0;
2043         int mid;
2044
2045         if (ucs < table[0].first || ucs > table[max].last)
2046                 return 0;
2047         while (max >= min) {
2048                 mid = (min + max) / 2;
2049                 if (ucs > table[mid].last)
2050                         min = mid + 1;
2051                 else if (ucs < table[mid].first)
2052                         max = mid - 1;
2053                 else
2054                         return 1;
2055         }
2056         return 0;
2057 }
2058
2059 static int is_double_width(uint32_t ucs)
2060 {
2061         static const struct interval double_width[] = {
2062                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2063                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2064                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2065                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2066         };
2067         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2068 }
2069
2070 /* acquires console_lock */
2071 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2072 {
2073 #ifdef VT_BUF_VRAM_ONLY
2074 #define FLUSH do { } while(0);
2075 #else
2076 #define FLUSH if (draw_x >= 0) { \
2077         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2078         draw_x = -1; \
2079         }
2080 #endif
2081
2082         int c, tc, ok, n = 0, draw_x = -1;
2083         unsigned int currcons;
2084         unsigned long draw_from = 0, draw_to = 0;
2085         struct vc_data *vc;
2086         unsigned char vc_attr;
2087         struct vt_notifier_param param;
2088         uint8_t rescan;
2089         uint8_t inverse;
2090         uint8_t width;
2091         u16 himask, charmask;
2092
2093         if (in_interrupt())
2094                 return count;
2095
2096         might_sleep();
2097
2098         console_lock();
2099         vc = tty->driver_data;
2100         if (vc == NULL) {
2101                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2102                 console_unlock();
2103                 return 0;
2104         }
2105
2106         currcons = vc->vc_num;
2107         if (!vc_cons_allocated(currcons)) {
2108                 /* could this happen? */
2109                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2110                 console_unlock();
2111                 return 0;
2112         }
2113
2114         himask = vc->vc_hi_font_mask;
2115         charmask = himask ? 0x1ff : 0xff;
2116
2117         /* undraw cursor first */
2118         if (IS_FG(vc))
2119                 hide_cursor(vc);
2120
2121         param.vc = vc;
2122
2123         while (!tty->stopped && count) {
2124                 int orig = *buf;
2125                 c = orig;
2126                 buf++;
2127                 n++;
2128                 count--;
2129                 rescan = 0;
2130                 inverse = 0;
2131                 width = 1;
2132
2133                 /* Do no translation at all in control states */
2134                 if (vc->vc_state != ESnormal) {
2135                         tc = c;
2136                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2137                     /* Combine UTF-8 into Unicode in vc_utf_char.
2138                      * vc_utf_count is the number of continuation bytes still
2139                      * expected to arrive.
2140                      * vc_npar is the number of continuation bytes arrived so
2141                      * far
2142                      */
2143 rescan_last_byte:
2144                     if ((c & 0xc0) == 0x80) {
2145                         /* Continuation byte received */
2146                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2147                         if (vc->vc_utf_count) {
2148                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2149                             vc->vc_npar++;
2150                             if (--vc->vc_utf_count) {
2151                                 /* Still need some bytes */
2152                                 continue;
2153                             }
2154                             /* Got a whole character */
2155                             c = vc->vc_utf_char;
2156                             /* Reject overlong sequences */
2157                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2158                                         c > utf8_length_changes[vc->vc_npar])
2159                                 c = 0xfffd;
2160                         } else {
2161                             /* Unexpected continuation byte */
2162                             vc->vc_utf_count = 0;
2163                             c = 0xfffd;
2164                         }
2165                     } else {
2166                         /* Single ASCII byte or first byte of a sequence received */
2167                         if (vc->vc_utf_count) {
2168                             /* Continuation byte expected */
2169                             rescan = 1;
2170                             vc->vc_utf_count = 0;
2171                             c = 0xfffd;
2172                         } else if (c > 0x7f) {
2173                             /* First byte of a multibyte sequence received */
2174                             vc->vc_npar = 0;
2175                             if ((c & 0xe0) == 0xc0) {
2176                                 vc->vc_utf_count = 1;
2177                                 vc->vc_utf_char = (c & 0x1f);
2178                             } else if ((c & 0xf0) == 0xe0) {
2179                                 vc->vc_utf_count = 2;
2180                                 vc->vc_utf_char = (c & 0x0f);
2181                             } else if ((c & 0xf8) == 0xf0) {
2182                                 vc->vc_utf_count = 3;
2183                                 vc->vc_utf_char = (c & 0x07);
2184                             } else if ((c & 0xfc) == 0xf8) {
2185                                 vc->vc_utf_count = 4;
2186                                 vc->vc_utf_char = (c & 0x03);
2187                             } else if ((c & 0xfe) == 0xfc) {
2188                                 vc->vc_utf_count = 5;
2189                                 vc->vc_utf_char = (c & 0x01);
2190                             } else {
2191                                 /* 254 and 255 are invalid */
2192                                 c = 0xfffd;
2193                             }
2194                             if (vc->vc_utf_count) {
2195                                 /* Still need some bytes */
2196                                 continue;
2197                             }
2198                         }
2199                         /* Nothing to do if an ASCII byte was received */
2200                     }
2201                     /* End of UTF-8 decoding. */
2202                     /* c is the received character, or U+FFFD for invalid sequences. */
2203                     /* Replace invalid Unicode code points with U+FFFD too */
2204                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2205                         c = 0xfffd;
2206                     tc = c;
2207                 } else {        /* no utf or alternate charset mode */
2208                     tc = vc_translate(vc, c);
2209                 }
2210
2211                 param.c = tc;
2212                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2213                                         &param) == NOTIFY_STOP)
2214                         continue;
2215
2216                 /* If the original code was a control character we
2217                  * only allow a glyph to be displayed if the code is
2218                  * not normally used (such as for cursor movement) or
2219                  * if the disp_ctrl mode has been explicitly enabled.
2220                  * Certain characters (as given by the CTRL_ALWAYS
2221                  * bitmap) are always displayed as control characters,
2222                  * as the console would be pretty useless without
2223                  * them; to display an arbitrary font position use the
2224                  * direct-to-font zone in UTF-8 mode.
2225                  */
2226                 ok = tc && (c >= 32 ||
2227                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2228                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2229                         && (c != 127 || vc->vc_disp_ctrl)
2230                         && (c != 128+27);
2231
2232                 if (vc->vc_state == ESnormal && ok) {
2233                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2234                                 if (is_double_width(c))
2235                                         width = 2;
2236                         }
2237                         /* Now try to find out how to display it */
2238                         tc = conv_uni_to_pc(vc, tc);
2239                         if (tc & ~charmask) {
2240                                 if (tc == -1 || tc == -2) {
2241                                     continue; /* nothing to display */
2242                                 }
2243                                 /* Glyph not found */
2244                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2245                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2246                                        This would make absolutely no sense with Unicode in mind,
2247                                        but do this for ASCII characters since a font may lack
2248                                        Unicode mapping info and we don't want to end up with
2249                                        having question marks only. */
2250                                     tc = c;
2251                                 } else {
2252                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2253                                     tc = conv_uni_to_pc(vc, 0xfffd);
2254                                     if (tc < 0) {
2255                                         inverse = 1;
2256                                         tc = conv_uni_to_pc(vc, '?');
2257                                         if (tc < 0) tc = '?';
2258                                     }
2259                                 }
2260                         }
2261
2262                         if (!inverse) {
2263                                 vc_attr = vc->vc_attr;
2264                         } else {
2265                                 /* invert vc_attr */
2266                                 if (!vc->vc_can_do_color) {
2267                                         vc_attr = (vc->vc_attr) ^ 0x08;
2268                                 } else if (vc->vc_hi_font_mask == 0x100) {
2269                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2270                                 } else {
2271                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2272                                 }
2273                                 FLUSH
2274                         }
2275
2276                         while (1) {
2277                                 if (vc->vc_need_wrap || vc->vc_decim)
2278                                         FLUSH
2279                                 if (vc->vc_need_wrap) {
2280                                         cr(vc);
2281                                         lf(vc);
2282                                 }
2283                                 if (vc->vc_decim)
2284                                         insert_char(vc, 1);
2285                                 scr_writew(himask ?
2286                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2287                                              (vc_attr << 8) + tc,
2288                                            (u16 *) vc->vc_pos);
2289                                 if (DO_UPDATE(vc) && draw_x < 0) {
2290                                         draw_x = vc->vc_x;
2291                                         draw_from = vc->vc_pos;
2292                                 }
2293                                 if (vc->vc_x == vc->vc_cols - 1) {
2294                                         vc->vc_need_wrap = vc->vc_decawm;
2295                                         draw_to = vc->vc_pos + 2;
2296                                 } else {
2297                                         vc->vc_x++;
2298                                         draw_to = (vc->vc_pos += 2);
2299                                 }
2300
2301                                 if (!--width) break;
2302
2303                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2304                                 if (tc < 0) tc = ' ';
2305                         }
2306                         notify_write(vc, c);
2307
2308                         if (inverse) {
2309                                 FLUSH
2310                         }
2311
2312                         if (rescan) {
2313                                 rescan = 0;
2314                                 inverse = 0;
2315                                 width = 1;
2316                                 c = orig;
2317                                 goto rescan_last_byte;
2318                         }
2319                         continue;
2320                 }
2321                 FLUSH
2322                 do_con_trol(tty, vc, orig);
2323         }
2324         FLUSH
2325         console_conditional_schedule();
2326         console_unlock();
2327         notify_update(vc);
2328         return n;
2329 #undef FLUSH
2330 }
2331
2332 /*
2333  * This is the console switching callback.
2334  *
2335  * Doing console switching in a process context allows
2336  * us to do the switches asynchronously (needed when we want
2337  * to switch due to a keyboard interrupt).  Synchronization
2338  * with other console code and prevention of re-entrancy is
2339  * ensured with console_lock.
2340  */
2341 static void console_callback(struct work_struct *ignored)
2342 {
2343         console_lock();
2344
2345         if (want_console >= 0) {
2346                 if (want_console != fg_console &&
2347                     vc_cons_allocated(want_console)) {
2348                         hide_cursor(vc_cons[fg_console].d);
2349                         change_console(vc_cons[want_console].d);
2350                         /* we only changed when the console had already
2351                            been allocated - a new console is not created
2352                            in an interrupt routine */
2353                 }
2354                 want_console = -1;
2355         }
2356         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2357                 do_poke_blanked_console = 0;
2358                 poke_blanked_console();
2359         }
2360         if (scrollback_delta) {
2361                 struct vc_data *vc = vc_cons[fg_console].d;
2362                 clear_selection();
2363                 if (vc->vc_mode == KD_TEXT)
2364                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2365                 scrollback_delta = 0;
2366         }
2367         if (blank_timer_expired) {
2368                 do_blank_screen(0);
2369                 blank_timer_expired = 0;
2370         }
2371         notify_update(vc_cons[fg_console].d);
2372
2373         console_unlock();
2374 }
2375
2376 int set_console(int nr)
2377 {
2378         struct vc_data *vc = vc_cons[fg_console].d;
2379
2380         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2381                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2382
2383                 /*
2384                  * Console switch will fail in console_callback() or
2385                  * change_console() so there is no point scheduling
2386                  * the callback
2387                  *
2388                  * Existing set_console() users don't check the return
2389                  * value so this shouldn't break anything
2390                  */
2391                 return -EINVAL;
2392         }
2393
2394         want_console = nr;
2395         schedule_console_callback();
2396
2397         return 0;
2398 }
2399
2400 struct tty_driver *console_driver;
2401
2402 #ifdef CONFIG_VT_CONSOLE
2403
2404 /**
2405  * vt_kmsg_redirect() - Sets/gets the kernel message console
2406  * @new:        The new virtual terminal number or -1 if the console should stay
2407  *              unchanged
2408  *
2409  * By default, the kernel messages are always printed on the current virtual
2410  * console. However, the user may modify that default with the
2411  * TIOCL_SETKMSGREDIRECT ioctl call.
2412  *
2413  * This function sets the kernel message console to be @new. It returns the old
2414  * virtual console number. The virtual terminal number 0 (both as parameter and
2415  * return value) means no redirection (i.e. always printed on the currently
2416  * active console).
2417  *
2418  * The parameter -1 means that only the current console is returned, but the
2419  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2420  * case to make the code more understandable.
2421  *
2422  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2423  * the parameter and always returns 0.
2424  */
2425 int vt_kmsg_redirect(int new)
2426 {
2427         static int kmsg_con;
2428
2429         if (new != -1)
2430                 return xchg(&kmsg_con, new);
2431         else
2432                 return kmsg_con;
2433 }
2434
2435 /*
2436  *      Console on virtual terminal
2437  *
2438  * The console must be locked when we get here.
2439  */
2440
2441 static void vt_console_print(struct console *co, const char *b, unsigned count)
2442 {
2443         struct vc_data *vc = vc_cons[fg_console].d;
2444         unsigned char c;
2445         static DEFINE_SPINLOCK(printing_lock);
2446         const ushort *start;
2447         ushort cnt = 0;
2448         ushort myx;
2449         int kmsg_console;
2450
2451         /* console busy or not yet initialized */
2452         if (!printable)
2453                 return;
2454         if (!spin_trylock(&printing_lock))
2455                 return;
2456
2457         kmsg_console = vt_get_kmsg_redirect();
2458         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2459                 vc = vc_cons[kmsg_console - 1].d;
2460
2461         /* read `x' only after setting currcons properly (otherwise
2462            the `x' macro will read the x of the foreground console). */
2463         myx = vc->vc_x;
2464
2465         if (!vc_cons_allocated(fg_console)) {
2466                 /* impossible */
2467                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2468                 goto quit;
2469         }
2470
2471         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2472                 goto quit;
2473
2474         /* undraw cursor first */
2475         if (IS_FG(vc))
2476                 hide_cursor(vc);
2477
2478         start = (ushort *)vc->vc_pos;
2479
2480         /* Contrived structure to try to emulate original need_wrap behaviour
2481          * Problems caused when we have need_wrap set on '\n' character */
2482         while (count--) {
2483                 c = *b++;
2484                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2485                         if (cnt > 0) {
2486                                 if (CON_IS_VISIBLE(vc))
2487                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2488                                 vc->vc_x += cnt;
2489                                 if (vc->vc_need_wrap)
2490                                         vc->vc_x--;
2491                                 cnt = 0;
2492                         }
2493                         if (c == 8) {           /* backspace */
2494                                 bs(vc);
2495                                 start = (ushort *)vc->vc_pos;
2496                                 myx = vc->vc_x;
2497                                 continue;
2498                         }
2499                         if (c != 13)
2500                                 lf(vc);
2501                         cr(vc);
2502                         start = (ushort *)vc->vc_pos;
2503                         myx = vc->vc_x;
2504                         if (c == 10 || c == 13)
2505                                 continue;
2506                 }
2507                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2508                 notify_write(vc, c);
2509                 cnt++;
2510                 if (myx == vc->vc_cols - 1) {
2511                         vc->vc_need_wrap = 1;
2512                         continue;
2513                 }
2514                 vc->vc_pos += 2;
2515                 myx++;
2516         }
2517         if (cnt > 0) {
2518                 if (CON_IS_VISIBLE(vc))
2519                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2520                 vc->vc_x += cnt;
2521                 if (vc->vc_x == vc->vc_cols) {
2522                         vc->vc_x--;
2523                         vc->vc_need_wrap = 1;
2524                 }
2525         }
2526         set_cursor(vc);
2527         notify_update(vc);
2528
2529 quit:
2530         spin_unlock(&printing_lock);
2531 }
2532
2533 static struct tty_driver *vt_console_device(struct console *c, int *index)
2534 {
2535         *index = c->index ? c->index-1 : fg_console;
2536         return console_driver;
2537 }
2538
2539 static struct console vt_console_driver = {
2540         .name           = "tty",
2541         .write          = vt_console_print,
2542         .device         = vt_console_device,
2543         .unblank        = unblank_screen,
2544         .flags          = CON_PRINTBUFFER,
2545         .index          = -1,
2546 };
2547 #endif
2548
2549 /*
2550  *      Handling of Linux-specific VC ioctls
2551  */
2552
2553 /*
2554  * Generally a bit racy with respect to console_lock();.
2555  *
2556  * There are some functions which don't need it.
2557  *
2558  * There are some functions which can sleep for arbitrary periods
2559  * (paste_selection) but we don't need the lock there anyway.
2560  *
2561  * set_selection has locking, and definitely needs it
2562  */
2563
2564 int tioclinux(struct tty_struct *tty, unsigned long arg)
2565 {
2566         char type, data;
2567         char __user *p = (char __user *)arg;
2568         int lines;
2569         int ret;
2570
2571         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2572                 return -EPERM;
2573         if (get_user(type, p))
2574                 return -EFAULT;
2575         ret = 0;
2576
2577         switch (type)
2578         {
2579                 case TIOCL_SETSEL:
2580                         console_lock();
2581                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2582                         console_unlock();
2583                         break;
2584                 case TIOCL_PASTESEL:
2585                         ret = paste_selection(tty);
2586                         break;
2587                 case TIOCL_UNBLANKSCREEN:
2588                         console_lock();
2589                         unblank_screen();
2590                         console_unlock();
2591                         break;
2592                 case TIOCL_SELLOADLUT:
2593                         console_lock();
2594                         ret = sel_loadlut(p);
2595                         console_unlock();
2596                         break;
2597                 case TIOCL_GETSHIFTSTATE:
2598
2599         /*
2600          * Make it possible to react to Shift+Mousebutton.
2601          * Note that 'shift_state' is an undocumented
2602          * kernel-internal variable; programs not closely
2603          * related to the kernel should not use this.
2604          */
2605                         data = vt_get_shift_state();
2606                         ret = __put_user(data, p);
2607                         break;
2608                 case TIOCL_GETMOUSEREPORTING:
2609                         console_lock(); /* May be overkill */
2610                         data = mouse_reporting();
2611                         console_unlock();
2612                         ret = __put_user(data, p);
2613                         break;
2614                 case TIOCL_SETVESABLANK:
2615                         console_lock();
2616                         ret = set_vesa_blanking(p);
2617                         console_unlock();
2618                         break;
2619                 case TIOCL_GETKMSGREDIRECT:
2620                         data = vt_get_kmsg_redirect();
2621                         ret = __put_user(data, p);
2622                         break;
2623                 case TIOCL_SETKMSGREDIRECT:
2624                         if (!capable(CAP_SYS_ADMIN)) {
2625                                 ret = -EPERM;
2626                         } else {
2627                                 if (get_user(data, p+1))
2628                                         ret = -EFAULT;
2629                                 else
2630                                         vt_kmsg_redirect(data);
2631                         }
2632                         break;
2633                 case TIOCL_GETFGCONSOLE:
2634                         /* No locking needed as this is a transiently
2635                            correct return anyway if the caller hasn't
2636                            disabled switching */
2637                         ret = fg_console;
2638                         break;
2639                 case TIOCL_SCROLLCONSOLE:
2640                         if (get_user(lines, (s32 __user *)(p+4))) {
2641                                 ret = -EFAULT;
2642                         } else {
2643                                 /* Need the console lock here. Note that lots
2644                                    of other calls need fixing before the lock
2645                                    is actually useful ! */
2646                                 console_lock();
2647                                 scrollfront(vc_cons[fg_console].d, lines);
2648                                 console_unlock();
2649                                 ret = 0;
2650                         }
2651                         break;
2652                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2653                         console_lock();
2654                         ignore_poke = 1;
2655                         do_blank_screen(0);
2656                         console_unlock();
2657                         break;
2658                 case TIOCL_BLANKEDSCREEN:
2659                         ret = console_blanked;
2660                         break;
2661                 default:
2662                         ret = -EINVAL;
2663                         break;
2664         }
2665         return ret;
2666 }
2667
2668 /*
2669  * /dev/ttyN handling
2670  */
2671
2672 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2673 {
2674         int     retval;
2675
2676         retval = do_con_write(tty, buf, count);
2677         con_flush_chars(tty);
2678
2679         return retval;
2680 }
2681
2682 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2683 {
2684         if (in_interrupt())
2685                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2686         return do_con_write(tty, &ch, 1);
2687 }
2688
2689 static int con_write_room(struct tty_struct *tty)
2690 {
2691         if (tty->stopped)
2692                 return 0;
2693         return 32768;           /* No limit, really; we're not buffering */
2694 }
2695
2696 static int con_chars_in_buffer(struct tty_struct *tty)
2697 {
2698         return 0;               /* we're not buffering */
2699 }
2700
2701 /*
2702  * con_throttle and con_unthrottle are only used for
2703  * paste_selection(), which has to stuff in a large number of
2704  * characters...
2705  */
2706 static void con_throttle(struct tty_struct *tty)
2707 {
2708 }
2709
2710 static void con_unthrottle(struct tty_struct *tty)
2711 {
2712         struct vc_data *vc = tty->driver_data;
2713
2714         wake_up_interruptible(&vc->paste_wait);
2715 }
2716
2717 /*
2718  * Turn the Scroll-Lock LED on when the tty is stopped
2719  */
2720 static void con_stop(struct tty_struct *tty)
2721 {
2722         int console_num;
2723         if (!tty)
2724                 return;
2725         console_num = tty->index;
2726         if (!vc_cons_allocated(console_num))
2727                 return;
2728         vt_kbd_con_stop(console_num);
2729 }
2730
2731 /*
2732  * Turn the Scroll-Lock LED off when the console is started
2733  */
2734 static void con_start(struct tty_struct *tty)
2735 {
2736         int console_num;
2737         if (!tty)
2738                 return;
2739         console_num = tty->index;
2740         if (!vc_cons_allocated(console_num))
2741                 return;
2742         vt_kbd_con_start(console_num);
2743 }
2744
2745 static void con_flush_chars(struct tty_struct *tty)
2746 {
2747         struct vc_data *vc;
2748
2749         if (in_interrupt())     /* from flush_to_ldisc */
2750                 return;
2751
2752         /* if we race with con_close(), vt may be null */
2753         console_lock();
2754         vc = tty->driver_data;
2755         if (vc)
2756                 set_cursor(vc);
2757         console_unlock();
2758 }
2759
2760 /*
2761  * Allocate the console screen memory.
2762  */
2763 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2764 {
2765         unsigned int currcons = tty->index;
2766         struct vc_data *vc;
2767         int ret;
2768
2769         console_lock();
2770         ret = vc_allocate(currcons);
2771         if (ret)
2772                 goto unlock;
2773
2774         vc = vc_cons[currcons].d;
2775
2776         /* Still being freed */
2777         if (vc->port.tty) {
2778                 ret = -ERESTARTSYS;
2779                 goto unlock;
2780         }
2781
2782         ret = tty_port_install(&vc->port, driver, tty);
2783         if (ret)
2784                 goto unlock;
2785
2786         tty->driver_data = vc;
2787         vc->port.tty = tty;
2788
2789         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2790                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2791                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2792         }
2793         if (vc->vc_utf)
2794                 tty->termios.c_iflag |= IUTF8;
2795         else
2796                 tty->termios.c_iflag &= ~IUTF8;
2797 unlock:
2798         console_unlock();
2799         return ret;
2800 }
2801
2802 static int con_open(struct tty_struct *tty, struct file *filp)
2803 {
2804         /* everything done in install */
2805         return 0;
2806 }
2807
2808
2809 static void con_close(struct tty_struct *tty, struct file *filp)
2810 {
2811         /* Nothing to do - we defer to shutdown */
2812 }
2813
2814 static void con_shutdown(struct tty_struct *tty)
2815 {
2816         struct vc_data *vc = tty->driver_data;
2817         BUG_ON(vc == NULL);
2818         console_lock();
2819         vc->port.tty = NULL;
2820         console_unlock();
2821 }
2822
2823 static int default_color           = 7; /* white */
2824 static int default_italic_color    = 2; // green (ASCII)
2825 static int default_underline_color = 3; // cyan (ASCII)
2826 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2827 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2828 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2829
2830 static void vc_init(struct vc_data *vc, unsigned int rows,
2831                     unsigned int cols, int do_clear)
2832 {
2833         int j, k ;
2834
2835         vc->vc_cols = cols;
2836         vc->vc_rows = rows;
2837         vc->vc_size_row = cols << 1;
2838         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2839
2840         set_origin(vc);
2841         vc->vc_pos = vc->vc_origin;
2842         reset_vc(vc);
2843         for (j=k=0; j<16; j++) {
2844                 vc->vc_palette[k++] = default_red[j] ;
2845                 vc->vc_palette[k++] = default_grn[j] ;
2846                 vc->vc_palette[k++] = default_blu[j] ;
2847         }
2848         vc->vc_def_color       = default_color;
2849         vc->vc_ulcolor         = default_underline_color;
2850         vc->vc_itcolor         = default_italic_color;
2851         vc->vc_halfcolor       = 0x08;   /* grey */
2852         init_waitqueue_head(&vc->paste_wait);
2853         reset_terminal(vc, do_clear);
2854 }
2855
2856 /*
2857  * This routine initializes console interrupts, and does nothing
2858  * else. If you want the screen to clear, call tty_write with
2859  * the appropriate escape-sequence.
2860  */
2861
2862 static int __init con_init(void)
2863 {
2864         const char *display_desc = NULL;
2865         struct vc_data *vc;
2866         unsigned int currcons = 0, i;
2867
2868         console_lock();
2869
2870         if (conswitchp)
2871                 display_desc = conswitchp->con_startup();
2872         if (!display_desc) {
2873                 fg_console = 0;
2874                 console_unlock();
2875                 return 0;
2876         }
2877
2878         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2879                 struct con_driver *con_driver = &registered_con_driver[i];
2880
2881                 if (con_driver->con == NULL) {
2882                         con_driver->con = conswitchp;
2883                         con_driver->desc = display_desc;
2884                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2885                         con_driver->first = 0;
2886                         con_driver->last = MAX_NR_CONSOLES - 1;
2887                         break;
2888                 }
2889         }
2890
2891         for (i = 0; i < MAX_NR_CONSOLES; i++)
2892                 con_driver_map[i] = conswitchp;
2893
2894         if (blankinterval) {
2895                 blank_state = blank_normal_wait;
2896                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2897         }
2898
2899         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2900                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2901                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2902                 tty_port_init(&vc->port);
2903                 visual_init(vc, currcons, 1);
2904                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2905                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2906                         currcons || !vc->vc_sw->con_save_screen);
2907         }
2908         currcons = fg_console = 0;
2909         master_display_fg = vc = vc_cons[currcons].d;
2910         set_origin(vc);
2911         save_screen(vc);
2912         gotoxy(vc, vc->vc_x, vc->vc_y);
2913         csi_J(vc, 0);
2914         update_screen(vc);
2915         pr_info("Console: %s %s %dx%d\n",
2916                 vc->vc_can_do_color ? "colour" : "mono",
2917                 display_desc, vc->vc_cols, vc->vc_rows);
2918         printable = 1;
2919
2920         console_unlock();
2921
2922 #ifdef CONFIG_VT_CONSOLE
2923         register_console(&vt_console_driver);
2924 #endif
2925         return 0;
2926 }
2927 console_initcall(con_init);
2928
2929 static const struct tty_operations con_ops = {
2930         .install = con_install,
2931         .open = con_open,
2932         .close = con_close,
2933         .write = con_write,
2934         .write_room = con_write_room,
2935         .put_char = con_put_char,
2936         .flush_chars = con_flush_chars,
2937         .chars_in_buffer = con_chars_in_buffer,
2938         .ioctl = vt_ioctl,
2939 #ifdef CONFIG_COMPAT
2940         .compat_ioctl = vt_compat_ioctl,
2941 #endif
2942         .stop = con_stop,
2943         .start = con_start,
2944         .throttle = con_throttle,
2945         .unthrottle = con_unthrottle,
2946         .resize = vt_resize,
2947         .shutdown = con_shutdown
2948 };
2949
2950 static struct cdev vc0_cdev;
2951
2952 static ssize_t show_tty_active(struct device *dev,
2953                                 struct device_attribute *attr, char *buf)
2954 {
2955         return sprintf(buf, "tty%d\n", fg_console + 1);
2956 }
2957 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2958
2959 int __init vty_init(const struct file_operations *console_fops)
2960 {
2961         cdev_init(&vc0_cdev, console_fops);
2962         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2963             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2964                 panic("Couldn't register /dev/tty0 driver\n");
2965         tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2966         if (IS_ERR(tty0dev))
2967                 tty0dev = NULL;
2968         else
2969                 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2970
2971         vcs_init();
2972
2973         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2974         if (!console_driver)
2975                 panic("Couldn't allocate console driver\n");
2976
2977         console_driver->name = "tty";
2978         console_driver->name_base = 1;
2979         console_driver->major = TTY_MAJOR;
2980         console_driver->minor_start = 1;
2981         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2982         console_driver->init_termios = tty_std_termios;
2983         if (default_utf8)
2984                 console_driver->init_termios.c_iflag |= IUTF8;
2985         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2986         tty_set_operations(console_driver, &con_ops);
2987         if (tty_register_driver(console_driver))
2988                 panic("Couldn't register console driver\n");
2989         kbd_init();
2990         console_map_init();
2991 #ifdef CONFIG_MDA_CONSOLE
2992         mda_console_init();
2993 #endif
2994         return 0;
2995 }
2996
2997 #ifndef VT_SINGLE_DRIVER
2998
2999 static struct class *vtconsole_class;
3000
3001 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3002                            int deflt)
3003 {
3004         struct module *owner = csw->owner;
3005         const char *desc = NULL;
3006         struct con_driver *con_driver;
3007         int i, j = -1, k = -1, retval = -ENODEV;
3008
3009         if (!try_module_get(owner))
3010                 return -ENODEV;
3011
3012         WARN_CONSOLE_UNLOCKED();
3013
3014         /* check if driver is registered */
3015         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3016                 con_driver = &registered_con_driver[i];
3017
3018                 if (con_driver->con == csw) {
3019                         desc = con_driver->desc;
3020                         retval = 0;
3021                         break;
3022                 }
3023         }
3024
3025         if (retval)
3026                 goto err;
3027
3028         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3029                 csw->con_startup();
3030                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3031         }
3032
3033         if (deflt) {
3034                 if (conswitchp)
3035                         module_put(conswitchp->owner);
3036
3037                 __module_get(owner);
3038                 conswitchp = csw;
3039         }
3040
3041         first = max(first, con_driver->first);
3042         last = min(last, con_driver->last);
3043
3044         for (i = first; i <= last; i++) {
3045                 int old_was_color;
3046                 struct vc_data *vc = vc_cons[i].d;
3047
3048                 if (con_driver_map[i])
3049                         module_put(con_driver_map[i]->owner);
3050                 __module_get(owner);
3051                 con_driver_map[i] = csw;
3052
3053                 if (!vc || !vc->vc_sw)
3054                         continue;
3055
3056                 j = i;
3057
3058                 if (CON_IS_VISIBLE(vc)) {
3059                         k = i;
3060                         save_screen(vc);
3061                 }
3062
3063                 old_was_color = vc->vc_can_do_color;
3064                 vc->vc_sw->con_deinit(vc);
3065                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3066                 visual_init(vc, i, 0);
3067                 set_origin(vc);
3068                 update_attr(vc);
3069
3070                 /* If the console changed between mono <-> color, then
3071                  * the attributes in the screenbuf will be wrong.  The
3072                  * following resets all attributes to something sane.
3073                  */
3074                 if (old_was_color != vc->vc_can_do_color)
3075                         clear_buffer_attributes(vc);
3076         }
3077
3078         pr_info("Console: switching ");
3079         if (!deflt)
3080                 printk("consoles %d-%d ", first+1, last+1);
3081         if (j >= 0) {
3082                 struct vc_data *vc = vc_cons[j].d;
3083
3084                 printk("to %s %s %dx%d\n",
3085                        vc->vc_can_do_color ? "colour" : "mono",
3086                        desc, vc->vc_cols, vc->vc_rows);
3087
3088                 if (k >= 0) {
3089                         vc = vc_cons[k].d;
3090                         update_screen(vc);
3091                 }
3092         } else
3093                 printk("to %s\n", desc);
3094
3095         retval = 0;
3096 err:
3097         module_put(owner);
3098         return retval;
3099 };
3100
3101
3102 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3103 static int con_is_graphics(const struct consw *csw, int first, int last)
3104 {
3105         int i, retval = 0;
3106
3107         for (i = first; i <= last; i++) {
3108                 struct vc_data *vc = vc_cons[i].d;
3109
3110                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3111                         retval = 1;
3112                         break;
3113                 }
3114         }
3115
3116         return retval;
3117 }
3118
3119 /* unlocked version of unbind_con_driver() */
3120 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3121 {
3122         struct module *owner = csw->owner;
3123         const struct consw *defcsw = NULL;
3124         struct con_driver *con_driver = NULL, *con_back = NULL;
3125         int i, retval = -ENODEV;
3126
3127         if (!try_module_get(owner))
3128                 return -ENODEV;
3129
3130         WARN_CONSOLE_UNLOCKED();
3131
3132         /* check if driver is registered and if it is unbindable */
3133         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3134                 con_driver = &registered_con_driver[i];
3135
3136                 if (con_driver->con == csw &&
3137                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3138                         retval = 0;
3139                         break;
3140                 }
3141         }
3142
3143         if (retval)
3144                 goto err;
3145
3146         retval = -ENODEV;
3147
3148         /* check if backup driver exists */
3149         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3150                 con_back = &registered_con_driver[i];
3151
3152                 if (con_back->con &&
3153                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3154                         defcsw = con_back->con;
3155                         retval = 0;
3156                         break;
3157                 }
3158         }
3159
3160         if (retval)
3161                 goto err;
3162
3163         if (!con_is_bound(csw))
3164                 goto err;
3165
3166         first = max(first, con_driver->first);
3167         last = min(last, con_driver->last);
3168
3169         for (i = first; i <= last; i++) {
3170                 if (con_driver_map[i] == csw) {
3171                         module_put(csw->owner);
3172                         con_driver_map[i] = NULL;
3173                 }
3174         }
3175
3176         if (!con_is_bound(defcsw)) {
3177                 const struct consw *defconsw = conswitchp;
3178
3179                 defcsw->con_startup();
3180                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3181                 /*
3182                  * vgacon may change the default driver to point
3183                  * to dummycon, we restore it here...
3184                  */
3185                 conswitchp = defconsw;
3186         }
3187
3188         if (!con_is_bound(csw))
3189                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3190
3191         /* ignore return value, binding should not fail */
3192         do_bind_con_driver(defcsw, first, last, deflt);
3193 err:
3194         module_put(owner);
3195         return retval;
3196
3197 }
3198 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3199
3200 static int vt_bind(struct con_driver *con)
3201 {
3202         const struct consw *defcsw = NULL, *csw = NULL;
3203         int i, more = 1, first = -1, last = -1, deflt = 0;
3204
3205         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3206             con_is_graphics(con->con, con->first, con->last))
3207                 goto err;
3208
3209         csw = con->con;
3210
3211         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3212                 struct con_driver *con = &registered_con_driver[i];
3213
3214                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3215                         defcsw = con->con;
3216                         break;
3217                 }
3218         }
3219
3220         if (!defcsw)
3221                 goto err;
3222
3223         while (more) {
3224                 more = 0;
3225
3226                 for (i = con->first; i <= con->last; i++) {
3227                         if (con_driver_map[i] == defcsw) {
3228                                 if (first == -1)
3229                                         first = i;
3230                                 last = i;
3231                                 more = 1;
3232                         } else if (first != -1)
3233                                 break;
3234                 }
3235
3236                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3237                         deflt = 1;
3238
3239                 if (first != -1) {
3240                         console_lock();
3241                         do_bind_con_driver(csw, first, last, deflt);
3242                         console_unlock();
3243                 }
3244
3245                 first = -1;
3246                 last = -1;
3247                 deflt = 0;
3248         }
3249
3250 err:
3251         return 0;
3252 }
3253
3254 static int vt_unbind(struct con_driver *con)
3255 {
3256         const struct consw *csw = NULL;
3257         int i, more = 1, first = -1, last = -1, deflt = 0;
3258
3259         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3260             con_is_graphics(con->con, con->first, con->last))
3261                 goto err;
3262
3263         csw = con->con;
3264
3265         while (more) {
3266                 more = 0;
3267
3268                 for (i = con->first; i <= con->last; i++) {
3269                         if (con_driver_map[i] == csw) {
3270                                 if (first == -1)
3271                                         first = i;
3272                                 last = i;
3273                                 more = 1;
3274                         } else if (first != -1)
3275                                 break;
3276                 }
3277
3278                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3279                         deflt = 1;
3280
3281                 if (first != -1) {
3282                         console_lock();
3283                         do_unbind_con_driver(csw, first, last, deflt);
3284                         console_unlock();
3285                 }
3286
3287                 first = -1;
3288                 last = -1;
3289                 deflt = 0;
3290         }
3291
3292 err:
3293         return 0;
3294 }
3295 #else
3296 static inline int vt_bind(struct con_driver *con)
3297 {
3298         return 0;
3299 }
3300 static inline int vt_unbind(struct con_driver *con)
3301 {
3302         return 0;
3303 }
3304 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3305
3306 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3307                           const char *buf, size_t count)
3308 {
3309         struct con_driver *con = dev_get_drvdata(dev);
3310         int bind = simple_strtoul(buf, NULL, 0);
3311
3312         if (bind)
3313                 vt_bind(con);
3314         else
3315                 vt_unbind(con);
3316
3317         return count;
3318 }
3319
3320 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3321                          char *buf)
3322 {
3323         struct con_driver *con = dev_get_drvdata(dev);
3324         int bind = con_is_bound(con->con);
3325
3326         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3327 }
3328
3329 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3330                          char *buf)
3331 {
3332         struct con_driver *con = dev_get_drvdata(dev);
3333
3334         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3335                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3336                          con->desc);
3337
3338 }
3339
3340 static struct device_attribute device_attrs[] = {
3341         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3342         __ATTR(name, S_IRUGO, show_name, NULL),
3343 };
3344
3345 static int vtconsole_init_device(struct con_driver *con)
3346 {
3347         int i;
3348         int error = 0;
3349
3350         con->flag |= CON_DRIVER_FLAG_ATTR;
3351         dev_set_drvdata(con->dev, con);
3352         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3353                 error = device_create_file(con->dev, &device_attrs[i]);
3354                 if (error)
3355                         break;
3356         }
3357
3358         if (error) {
3359                 while (--i >= 0)
3360                         device_remove_file(con->dev, &device_attrs[i]);
3361                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3362         }
3363
3364         return error;
3365 }
3366
3367 static void vtconsole_deinit_device(struct con_driver *con)
3368 {
3369         int i;
3370
3371         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3372                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3373                         device_remove_file(con->dev, &device_attrs[i]);
3374                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3375         }
3376 }
3377
3378 /**
3379  * con_is_bound - checks if driver is bound to the console
3380  * @csw: console driver
3381  *
3382  * RETURNS: zero if unbound, nonzero if bound
3383  *
3384  * Drivers can call this and if zero, they should release
3385  * all resources allocated on con_startup()
3386  */
3387 int con_is_bound(const struct consw *csw)
3388 {
3389         int i, bound = 0;
3390
3391         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3392                 if (con_driver_map[i] == csw) {
3393                         bound = 1;
3394                         break;
3395                 }
3396         }
3397
3398         return bound;
3399 }
3400 EXPORT_SYMBOL(con_is_bound);
3401
3402 /**
3403  * con_debug_enter - prepare the console for the kernel debugger
3404  * @sw: console driver
3405  *
3406  * Called when the console is taken over by the kernel debugger, this
3407  * function needs to save the current console state, then put the console
3408  * into a state suitable for the kernel debugger.
3409  *
3410  * RETURNS:
3411  * Zero on success, nonzero if a failure occurred when trying to prepare
3412  * the console for the debugger.
3413  */
3414 int con_debug_enter(struct vc_data *vc)
3415 {
3416         int ret = 0;
3417
3418         saved_fg_console = fg_console;
3419         saved_last_console = last_console;
3420         saved_want_console = want_console;
3421         saved_vc_mode = vc->vc_mode;
3422         saved_console_blanked = console_blanked;
3423         vc->vc_mode = KD_TEXT;
3424         console_blanked = 0;
3425         if (vc->vc_sw->con_debug_enter)
3426                 ret = vc->vc_sw->con_debug_enter(vc);
3427 #ifdef CONFIG_KGDB_KDB
3428         /* Set the initial LINES variable if it is not already set */
3429         if (vc->vc_rows < 999) {
3430                 int linecount;
3431                 char lns[4];
3432                 const char *setargs[3] = {
3433                         "set",
3434                         "LINES",
3435                         lns,
3436                 };
3437                 if (kdbgetintenv(setargs[0], &linecount)) {
3438                         snprintf(lns, 4, "%i", vc->vc_rows);
3439                         kdb_set(2, setargs);
3440                 }
3441         }
3442         if (vc->vc_cols < 999) {
3443                 int colcount;
3444                 char cols[4];
3445                 const char *setargs[3] = {
3446                         "set",
3447                         "COLUMNS",
3448                         cols,
3449                 };
3450                 if (kdbgetintenv(setargs[0], &colcount)) {
3451                         snprintf(cols, 4, "%i", vc->vc_cols);
3452                         kdb_set(2, setargs);
3453                 }
3454         }
3455 #endif /* CONFIG_KGDB_KDB */
3456         return ret;
3457 }
3458 EXPORT_SYMBOL_GPL(con_debug_enter);
3459
3460 /**
3461  * con_debug_leave - restore console state
3462  * @sw: console driver
3463  *
3464  * Restore the console state to what it was before the kernel debugger
3465  * was invoked.
3466  *
3467  * RETURNS:
3468  * Zero on success, nonzero if a failure occurred when trying to restore
3469  * the console.
3470  */
3471 int con_debug_leave(void)
3472 {
3473         struct vc_data *vc;
3474         int ret = 0;
3475
3476         fg_console = saved_fg_console;
3477         last_console = saved_last_console;
3478         want_console = saved_want_console;
3479         console_blanked = saved_console_blanked;
3480         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3481
3482         vc = vc_cons[fg_console].d;
3483         if (vc->vc_sw->con_debug_leave)
3484                 ret = vc->vc_sw->con_debug_leave(vc);
3485         return ret;
3486 }
3487 EXPORT_SYMBOL_GPL(con_debug_leave);
3488
3489 static int do_register_con_driver(const struct consw *csw, int first, int last)
3490 {
3491         struct module *owner = csw->owner;
3492         struct con_driver *con_driver;
3493         const char *desc;
3494         int i, retval = 0;
3495
3496         WARN_CONSOLE_UNLOCKED();
3497
3498         if (!try_module_get(owner))
3499                 return -ENODEV;
3500
3501         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3502                 con_driver = &registered_con_driver[i];
3503
3504                 /* already registered */
3505                 if (con_driver->con == csw)
3506                         retval = -EBUSY;
3507         }
3508
3509         if (retval)
3510                 goto err;
3511
3512         desc = csw->con_startup();
3513
3514         if (!desc)
3515                 goto err;
3516
3517         retval = -EINVAL;
3518
3519         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3520                 con_driver = &registered_con_driver[i];
3521
3522                 if (con_driver->con == NULL) {
3523                         con_driver->con = csw;
3524                         con_driver->desc = desc;
3525                         con_driver->node = i;
3526                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3527                                            CON_DRIVER_FLAG_INIT;
3528                         con_driver->first = first;
3529                         con_driver->last = last;
3530                         retval = 0;
3531                         break;
3532                 }
3533         }
3534
3535         if (retval)
3536                 goto err;
3537
3538         con_driver->dev = device_create(vtconsole_class, NULL,
3539                                                 MKDEV(0, con_driver->node),
3540                                                 NULL, "vtcon%i",
3541                                                 con_driver->node);
3542
3543         if (IS_ERR(con_driver->dev)) {
3544                 printk(KERN_WARNING "Unable to create device for %s; "
3545                        "errno = %ld\n", con_driver->desc,
3546                        PTR_ERR(con_driver->dev));
3547                 con_driver->dev = NULL;
3548         } else {
3549                 vtconsole_init_device(con_driver);
3550         }
3551
3552 err:
3553         module_put(owner);
3554         return retval;
3555 }
3556
3557
3558 /**
3559  * do_unregister_con_driver - unregister console driver from console layer
3560  * @csw: console driver
3561  *
3562  * DESCRIPTION: All drivers that registers to the console layer must
3563  * call this function upon exit, or if the console driver is in a state
3564  * where it won't be able to handle console services, such as the
3565  * framebuffer console without loaded framebuffer drivers.
3566  *
3567  * The driver must unbind first prior to unregistration.
3568  */
3569 int do_unregister_con_driver(const struct consw *csw)
3570 {
3571         int i, retval = -ENODEV;
3572
3573         /* cannot unregister a bound driver */
3574         if (con_is_bound(csw))
3575                 goto err;
3576
3577         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3578                 struct con_driver *con_driver = &registered_con_driver[i];
3579
3580                 if (con_driver->con == csw &&
3581                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3582                         vtconsole_deinit_device(con_driver);
3583                         device_destroy(vtconsole_class,
3584                                        MKDEV(0, con_driver->node));
3585                         con_driver->con = NULL;
3586                         con_driver->desc = NULL;
3587                         con_driver->dev = NULL;
3588                         con_driver->node = 0;
3589                         con_driver->flag = 0;
3590                         con_driver->first = 0;
3591                         con_driver->last = 0;
3592                         retval = 0;
3593                         break;
3594                 }
3595         }
3596 err:
3597         return retval;
3598 }
3599 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3600
3601 /*
3602  *      If we support more console drivers, this function is used
3603  *      when a driver wants to take over some existing consoles
3604  *      and become default driver for newly opened ones.
3605  *
3606  *      do_take_over_console is basically a register followed by unbind
3607  */
3608 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3609 {
3610         int err;
3611
3612         err = do_register_con_driver(csw, first, last);
3613         /*
3614          * If we get an busy error we still want to bind the console driver
3615          * and return success, as we may have unbound the console driver
3616          * but not unregistered it.
3617          */
3618         if (err == -EBUSY)
3619                 err = 0;
3620         if (!err)
3621                 do_bind_con_driver(csw, first, last, deflt);
3622
3623         return err;
3624 }
3625 EXPORT_SYMBOL_GPL(do_take_over_console);
3626
3627
3628 /*
3629  * give_up_console is a wrapper to unregister_con_driver. It will only
3630  * work if driver is fully unbound.
3631  */
3632 void give_up_console(const struct consw *csw)
3633 {
3634         console_lock();
3635         do_unregister_con_driver(csw);
3636         console_unlock();
3637 }
3638
3639 static int __init vtconsole_class_init(void)
3640 {
3641         int i;
3642
3643         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3644         if (IS_ERR(vtconsole_class)) {
3645                 printk(KERN_WARNING "Unable to create vt console class; "
3646                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3647                 vtconsole_class = NULL;
3648         }
3649
3650         /* Add system drivers to sysfs */
3651         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3652                 struct con_driver *con = &registered_con_driver[i];
3653
3654                 if (con->con && !con->dev) {
3655                         con->dev = device_create(vtconsole_class, NULL,
3656                                                          MKDEV(0, con->node),
3657                                                          NULL, "vtcon%i",
3658                                                          con->node);
3659
3660                         if (IS_ERR(con->dev)) {
3661                                 printk(KERN_WARNING "Unable to create "
3662                                        "device for %s; errno = %ld\n",
3663                                        con->desc, PTR_ERR(con->dev));
3664                                 con->dev = NULL;
3665                         } else {
3666                                 vtconsole_init_device(con);
3667                         }
3668                 }
3669         }
3670
3671         return 0;
3672 }
3673 postcore_initcall(vtconsole_class_init);
3674
3675 #endif
3676
3677 /*
3678  *      Screen blanking
3679  */
3680
3681 static int set_vesa_blanking(char __user *p)
3682 {
3683         unsigned int mode;
3684
3685         if (get_user(mode, p + 1))
3686                 return -EFAULT;
3687
3688         vesa_blank_mode = (mode < 4) ? mode : 0;
3689         return 0;
3690 }
3691
3692 void do_blank_screen(int entering_gfx)
3693 {
3694         struct vc_data *vc = vc_cons[fg_console].d;
3695         int i;
3696
3697         WARN_CONSOLE_UNLOCKED();
3698
3699         if (console_blanked) {
3700                 if (blank_state == blank_vesa_wait) {
3701                         blank_state = blank_off;
3702                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3703                 }
3704                 return;
3705         }
3706
3707         /* entering graphics mode? */
3708         if (entering_gfx) {
3709                 hide_cursor(vc);
3710                 save_screen(vc);
3711                 vc->vc_sw->con_blank(vc, -1, 1);
3712                 console_blanked = fg_console + 1;
3713                 blank_state = blank_off;
3714                 set_origin(vc);
3715                 return;
3716         }
3717
3718         if (blank_state != blank_normal_wait)
3719                 return;
3720         blank_state = blank_off;
3721
3722         /* don't blank graphics */
3723         if (vc->vc_mode != KD_TEXT) {
3724                 console_blanked = fg_console + 1;
3725                 return;
3726         }
3727
3728         hide_cursor(vc);
3729         del_timer_sync(&console_timer);
3730         blank_timer_expired = 0;
3731
3732         save_screen(vc);
3733         /* In case we need to reset origin, blanking hook returns 1 */
3734         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3735         console_blanked = fg_console + 1;
3736         if (i)
3737                 set_origin(vc);
3738
3739         if (console_blank_hook && console_blank_hook(1))
3740                 return;
3741
3742         if (vesa_off_interval && vesa_blank_mode) {
3743                 blank_state = blank_vesa_wait;
3744                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3745         }
3746         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3747 }
3748 EXPORT_SYMBOL(do_blank_screen);
3749
3750 /*
3751  * Called by timer as well as from vt_console_driver
3752  */
3753 void do_unblank_screen(int leaving_gfx)
3754 {
3755         struct vc_data *vc;
3756
3757         /* This should now always be called from a "sane" (read: can schedule)
3758          * context for the sake of the low level drivers, except in the special
3759          * case of oops_in_progress
3760          */
3761         if (!oops_in_progress)
3762                 might_sleep();
3763
3764         WARN_CONSOLE_UNLOCKED();
3765
3766         ignore_poke = 0;
3767         if (!console_blanked)
3768                 return;
3769         if (!vc_cons_allocated(fg_console)) {
3770                 /* impossible */
3771                 pr_warning("unblank_screen: tty %d not allocated ??\n",
3772                            fg_console+1);
3773                 return;
3774         }
3775         vc = vc_cons[fg_console].d;
3776         /* Try to unblank in oops case too */
3777         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3778                 return; /* but leave console_blanked != 0 */
3779
3780         if (blankinterval) {
3781                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3782                 blank_state = blank_normal_wait;
3783         }
3784
3785         console_blanked = 0;
3786         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3787                 /* Low-level driver cannot restore -> do it ourselves */
3788                 update_screen(vc);
3789         if (console_blank_hook)
3790                 console_blank_hook(0);
3791         set_palette(vc);
3792         set_cursor(vc);
3793         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3794 }
3795 EXPORT_SYMBOL(do_unblank_screen);
3796
3797 /*
3798  * This is called by the outside world to cause a forced unblank, mostly for
3799  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3800  * call it with 1 as an argument and so force a mode restore... that may kill
3801  * X or at least garbage the screen but would also make the Oops visible...
3802  */
3803 void unblank_screen(void)
3804 {
3805         do_unblank_screen(0);
3806 }
3807
3808 /*
3809  * We defer the timer blanking to work queue so it can take the console mutex
3810  * (console operations can still happen at irq time, but only from printk which
3811  * has the console mutex. Not perfect yet, but better than no locking
3812  */
3813 static void blank_screen_t(unsigned long dummy)
3814 {
3815         if (unlikely(!keventd_up())) {
3816                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3817                 return;
3818         }
3819         blank_timer_expired = 1;
3820         schedule_work(&console_work);
3821 }
3822
3823 void poke_blanked_console(void)
3824 {
3825         WARN_CONSOLE_UNLOCKED();
3826
3827         /* Add this so we quickly catch whoever might call us in a non
3828          * safe context. Nowadays, unblank_screen() isn't to be called in
3829          * atomic contexts and is allowed to schedule (with the special case
3830          * of oops_in_progress, but that isn't of any concern for this
3831          * function. --BenH.
3832          */
3833         might_sleep();
3834
3835         /* This isn't perfectly race free, but a race here would be mostly harmless,
3836          * at worse, we'll do a spurrious blank and it's unlikely
3837          */
3838         del_timer(&console_timer);
3839         blank_timer_expired = 0;
3840
3841         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3842                 return;
3843         if (console_blanked)
3844                 unblank_screen();
3845         else if (blankinterval) {
3846                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3847                 blank_state = blank_normal_wait;
3848         }
3849 }
3850
3851 /*
3852  *      Palettes
3853  */
3854
3855 static void set_palette(struct vc_data *vc)
3856 {
3857         WARN_CONSOLE_UNLOCKED();
3858
3859         if (vc->vc_mode != KD_GRAPHICS)
3860                 vc->vc_sw->con_set_palette(vc, color_table);
3861 }
3862
3863 /*
3864  * Load palette into the DAC registers. arg points to a colour
3865  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3866  */
3867
3868 int con_set_cmap(unsigned char __user *arg)
3869 {
3870         int i, j, k;
3871         unsigned char colormap[3*16];
3872
3873         if (copy_from_user(colormap, arg, sizeof(colormap)))
3874                 return -EFAULT;
3875
3876         console_lock();
3877         for (i = k = 0; i < 16; i++) {
3878                 default_red[i] = colormap[k++];
3879                 default_grn[i] = colormap[k++];
3880                 default_blu[i] = colormap[k++];
3881         }
3882         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3883                 if (!vc_cons_allocated(i))
3884                         continue;
3885                 for (j = k = 0; j < 16; j++) {
3886                         vc_cons[i].d->vc_palette[k++] = default_red[j];
3887                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
3888                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
3889                 }
3890                 set_palette(vc_cons[i].d);
3891         }
3892         console_unlock();
3893
3894         return 0;
3895 }
3896
3897 int con_get_cmap(unsigned char __user *arg)
3898 {
3899         int i, k;
3900         unsigned char colormap[3*16];
3901
3902         console_lock();
3903         for (i = k = 0; i < 16; i++) {
3904                 colormap[k++] = default_red[i];
3905                 colormap[k++] = default_grn[i];
3906                 colormap[k++] = default_blu[i];
3907         }
3908         console_unlock();
3909
3910         if (copy_to_user(arg, colormap, sizeof(colormap)))
3911                 return -EFAULT;
3912
3913         return 0;
3914 }
3915
3916 void reset_palette(struct vc_data *vc)
3917 {
3918         int j, k;
3919         for (j=k=0; j<16; j++) {
3920                 vc->vc_palette[k++] = default_red[j];
3921                 vc->vc_palette[k++] = default_grn[j];
3922                 vc->vc_palette[k++] = default_blu[j];
3923         }
3924         set_palette(vc);
3925 }
3926
3927 /*
3928  *  Font switching
3929  *
3930  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3931  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3932  *  depending on width) reserved for each character which is kinda wasty, but
3933  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3934  *  is up to the actual low-level console-driver convert data into its favorite
3935  *  format (maybe we should add a `fontoffset' field to the `display'
3936  *  structure so we won't have to convert the fontdata all the time.
3937  *  /Jes
3938  */
3939
3940 #define max_font_size 65536
3941
3942 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3943 {
3944         struct console_font font;
3945         int rc = -EINVAL;
3946         int c;
3947
3948         if (op->data) {
3949                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3950                 if (!font.data)
3951                         return -ENOMEM;
3952         } else
3953                 font.data = NULL;
3954
3955         console_lock();
3956         if (vc->vc_mode != KD_TEXT)
3957                 rc = -EINVAL;
3958         else if (vc->vc_sw->con_font_get)
3959                 rc = vc->vc_sw->con_font_get(vc, &font);
3960         else
3961                 rc = -ENOSYS;
3962         console_unlock();
3963
3964         if (rc)
3965                 goto out;
3966
3967         c = (font.width+7)/8 * 32 * font.charcount;
3968
3969         if (op->data && font.charcount > op->charcount)
3970                 rc = -ENOSPC;
3971         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3972                 if (font.width > op->width || font.height > op->height)
3973                         rc = -ENOSPC;
3974         } else {
3975                 if (font.width != 8)
3976                         rc = -EIO;
3977                 else if ((op->height && font.height > op->height) ||
3978                          font.height > 32)
3979                         rc = -ENOSPC;
3980         }
3981         if (rc)
3982                 goto out;
3983
3984         op->height = font.height;
3985         op->width = font.width;
3986         op->charcount = font.charcount;
3987
3988         if (op->data && copy_to_user(op->data, font.data, c))
3989                 rc = -EFAULT;
3990
3991 out:
3992         kfree(font.data);
3993         return rc;
3994 }
3995
3996 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3997 {
3998         struct console_font font;
3999         int rc = -EINVAL;
4000         int size;
4001
4002         if (vc->vc_mode != KD_TEXT)
4003                 return -EINVAL;
4004         if (!op->data)
4005                 return -EINVAL;
4006         if (op->charcount > 512)
4007                 return -EINVAL;
4008         if (!op->height) {              /* Need to guess font height [compat] */
4009                 int h, i;
4010                 u8 __user *charmap = op->data;
4011                 u8 tmp;
4012
4013                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4014                    so that we can get rid of this soon */
4015                 if (!(op->flags & KD_FONT_FLAG_OLD))
4016                         return -EINVAL;
4017                 for (h = 32; h > 0; h--)
4018                         for (i = 0; i < op->charcount; i++) {
4019                                 if (get_user(tmp, &charmap[32*i+h-1]))
4020                                         return -EFAULT;
4021                                 if (tmp)
4022                                         goto nonzero;
4023                         }
4024                 return -EINVAL;
4025         nonzero:
4026                 op->height = h;
4027         }
4028         if (op->width <= 0 || op->width > 32 || op->height > 32)
4029                 return -EINVAL;
4030         size = (op->width+7)/8 * 32 * op->charcount;
4031         if (size > max_font_size)
4032                 return -ENOSPC;
4033         font.charcount = op->charcount;
4034         font.height = op->height;
4035         font.width = op->width;
4036         font.data = memdup_user(op->data, size);
4037         if (IS_ERR(font.data))
4038                 return PTR_ERR(font.data);
4039         console_lock();
4040         if (vc->vc_mode != KD_TEXT)
4041                 rc = -EINVAL;
4042         else if (vc->vc_sw->con_font_set)
4043                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4044         else
4045                 rc = -ENOSYS;
4046         console_unlock();
4047         kfree(font.data);
4048         return rc;
4049 }
4050
4051 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4052 {
4053         struct console_font font = {.width = op->width, .height = op->height};
4054         char name[MAX_FONT_NAME];
4055         char *s = name;
4056         int rc;
4057
4058
4059         if (!op->data)
4060                 s = NULL;
4061         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4062                 return -EFAULT;
4063         else
4064                 name[MAX_FONT_NAME - 1] = 0;
4065
4066         console_lock();
4067         if (vc->vc_mode != KD_TEXT) {
4068                 console_unlock();
4069                 return -EINVAL;
4070         }
4071         if (vc->vc_sw->con_font_default)
4072                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4073         else
4074                 rc = -ENOSYS;
4075         console_unlock();
4076         if (!rc) {
4077                 op->width = font.width;
4078                 op->height = font.height;
4079         }
4080         return rc;
4081 }
4082
4083 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4084 {
4085         int con = op->height;
4086         int rc;
4087
4088
4089         console_lock();
4090         if (vc->vc_mode != KD_TEXT)
4091                 rc = -EINVAL;
4092         else if (!vc->vc_sw->con_font_copy)
4093                 rc = -ENOSYS;
4094         else if (con < 0 || !vc_cons_allocated(con))
4095                 rc = -ENOTTY;
4096         else if (con == vc->vc_num)     /* nothing to do */
4097                 rc = 0;
4098         else
4099                 rc = vc->vc_sw->con_font_copy(vc, con);
4100         console_unlock();
4101         return rc;
4102 }
4103
4104 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4105 {
4106         switch (op->op) {
4107         case KD_FONT_OP_SET:
4108                 return con_font_set(vc, op);
4109         case KD_FONT_OP_GET:
4110                 return con_font_get(vc, op);
4111         case KD_FONT_OP_SET_DEFAULT:
4112                 return con_font_default(vc, op);
4113         case KD_FONT_OP_COPY:
4114                 return con_font_copy(vc, op);
4115         }
4116         return -ENOSYS;
4117 }
4118
4119 /*
4120  *      Interface exported to selection and vcs.
4121  */
4122
4123 /* used by selection */
4124 u16 screen_glyph(struct vc_data *vc, int offset)
4125 {
4126         u16 w = scr_readw(screenpos(vc, offset, 1));
4127         u16 c = w & 0xff;
4128
4129         if (w & vc->vc_hi_font_mask)
4130                 c |= 0x100;
4131         return c;
4132 }
4133 EXPORT_SYMBOL_GPL(screen_glyph);
4134
4135 /* used by vcs - note the word offset */
4136 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4137 {
4138         return screenpos(vc, 2 * w_offset, viewed);
4139 }
4140
4141 void getconsxy(struct vc_data *vc, unsigned char *p)
4142 {
4143         p[0] = vc->vc_x;
4144         p[1] = vc->vc_y;
4145 }
4146
4147 void putconsxy(struct vc_data *vc, unsigned char *p)
4148 {
4149         hide_cursor(vc);
4150         gotoxy(vc, p[0], p[1]);
4151         set_cursor(vc);
4152 }
4153
4154 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4155 {
4156         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4157                 return softcursor_original;
4158         return scr_readw(org);
4159 }
4160
4161 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4162 {
4163         scr_writew(val, org);
4164         if ((unsigned long)org == vc->vc_pos) {
4165                 softcursor_original = -1;
4166                 add_softcursor(vc);
4167         }
4168 }
4169
4170 void vcs_scr_updated(struct vc_data *vc)
4171 {
4172         notify_update(vc);
4173 }
4174
4175 /*
4176  *      Visible symbols for modules
4177  */
4178
4179 EXPORT_SYMBOL(color_table);
4180 EXPORT_SYMBOL(default_red);
4181 EXPORT_SYMBOL(default_grn);
4182 EXPORT_SYMBOL(default_blu);
4183 EXPORT_SYMBOL(update_region);
4184 EXPORT_SYMBOL(redraw_screen);
4185 EXPORT_SYMBOL(vc_resize);
4186 EXPORT_SYMBOL(fg_console);
4187 EXPORT_SYMBOL(console_blank_hook);
4188 EXPORT_SYMBOL(console_blanked);
4189 EXPORT_SYMBOL(vc_cons);
4190 EXPORT_SYMBOL(global_cursor_default);
4191 #ifndef VT_SINGLE_DRIVER
4192 EXPORT_SYMBOL(give_up_console);
4193 #endif